File-copy from v4.4.100
This is the result of 'cp' from a linux-stable tree with the 'v4.4.100'
tag checked out (commit 26d6298789e695c9f627ce49a7bbd2286405798a) on
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Please refer to that tree for all history prior to this point.
Change-Id: I8a9ee2aea93cd29c52c847d0ce33091a73ae6afe
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
new file mode 100644
index 0000000..ca9ebc3
--- /dev/null
+++ b/fs/nfsd/nfs4state.c
@@ -0,0 +1,6953 @@
+/*
+* Copyright (c) 2001 The Regents of the University of Michigan.
+* All rights reserved.
+*
+* Kendrick Smith <kmsmith@umich.edu>
+* Andy Adamson <kandros@umich.edu>
+*
+* Redistribution and use in source and binary forms, with or without
+* modification, are permitted provided that the following conditions
+* are met:
+*
+* 1. Redistributions of source code must retain the above copyright
+* notice, this list of conditions and the following disclaimer.
+* 2. Redistributions in binary form must reproduce the above copyright
+* notice, this list of conditions and the following disclaimer in the
+* documentation and/or other materials provided with the distribution.
+* 3. Neither the name of the University nor the names of its
+* contributors may be used to endorse or promote products derived
+* from this software without specific prior written permission.
+*
+* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*
+*/
+
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <linux/namei.h>
+#include <linux/swap.h>
+#include <linux/pagemap.h>
+#include <linux/ratelimit.h>
+#include <linux/sunrpc/svcauth_gss.h>
+#include <linux/sunrpc/addr.h>
+#include <linux/jhash.h>
+#include "xdr4.h"
+#include "xdr4cb.h"
+#include "vfs.h"
+#include "current_stateid.h"
+
+#include "netns.h"
+#include "pnfs.h"
+
+#define NFSDDBG_FACILITY NFSDDBG_PROC
+
+#define all_ones {{~0,~0},~0}
+static const stateid_t one_stateid = {
+ .si_generation = ~0,
+ .si_opaque = all_ones,
+};
+static const stateid_t zero_stateid = {
+ /* all fields zero */
+};
+static const stateid_t currentstateid = {
+ .si_generation = 1,
+};
+
+static u64 current_sessionid = 1;
+
+#define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
+#define ONE_STATEID(stateid) (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
+#define CURRENT_STATEID(stateid) (!memcmp((stateid), ¤tstateid, sizeof(stateid_t)))
+
+/* forward declarations */
+static bool check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner);
+static void nfs4_free_ol_stateid(struct nfs4_stid *stid);
+
+/* Locking: */
+
+/*
+ * Currently used for the del_recall_lru and file hash table. In an
+ * effort to decrease the scope of the client_mutex, this spinlock may
+ * eventually cover more:
+ */
+static DEFINE_SPINLOCK(state_lock);
+
+/*
+ * A waitqueue for all in-progress 4.0 CLOSE operations that are waiting for
+ * the refcount on the open stateid to drop.
+ */
+static DECLARE_WAIT_QUEUE_HEAD(close_wq);
+
+static struct kmem_cache *openowner_slab;
+static struct kmem_cache *lockowner_slab;
+static struct kmem_cache *file_slab;
+static struct kmem_cache *stateid_slab;
+static struct kmem_cache *deleg_slab;
+static struct kmem_cache *odstate_slab;
+
+static void free_session(struct nfsd4_session *);
+
+static struct nfsd4_callback_ops nfsd4_cb_recall_ops;
+
+static bool is_session_dead(struct nfsd4_session *ses)
+{
+ return ses->se_flags & NFS4_SESSION_DEAD;
+}
+
+static __be32 mark_session_dead_locked(struct nfsd4_session *ses, int ref_held_by_me)
+{
+ if (atomic_read(&ses->se_ref) > ref_held_by_me)
+ return nfserr_jukebox;
+ ses->se_flags |= NFS4_SESSION_DEAD;
+ return nfs_ok;
+}
+
+static bool is_client_expired(struct nfs4_client *clp)
+{
+ return clp->cl_time == 0;
+}
+
+static __be32 get_client_locked(struct nfs4_client *clp)
+{
+ struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
+
+ lockdep_assert_held(&nn->client_lock);
+
+ if (is_client_expired(clp))
+ return nfserr_expired;
+ atomic_inc(&clp->cl_refcount);
+ return nfs_ok;
+}
+
+/* must be called under the client_lock */
+static inline void
+renew_client_locked(struct nfs4_client *clp)
+{
+ struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
+
+ if (is_client_expired(clp)) {
+ WARN_ON(1);
+ printk("%s: client (clientid %08x/%08x) already expired\n",
+ __func__,
+ clp->cl_clientid.cl_boot,
+ clp->cl_clientid.cl_id);
+ return;
+ }
+
+ dprintk("renewing client (clientid %08x/%08x)\n",
+ clp->cl_clientid.cl_boot,
+ clp->cl_clientid.cl_id);
+ list_move_tail(&clp->cl_lru, &nn->client_lru);
+ clp->cl_time = get_seconds();
+}
+
+static void put_client_renew_locked(struct nfs4_client *clp)
+{
+ struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
+
+ lockdep_assert_held(&nn->client_lock);
+
+ if (!atomic_dec_and_test(&clp->cl_refcount))
+ return;
+ if (!is_client_expired(clp))
+ renew_client_locked(clp);
+}
+
+static void put_client_renew(struct nfs4_client *clp)
+{
+ struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
+
+ if (!atomic_dec_and_lock(&clp->cl_refcount, &nn->client_lock))
+ return;
+ if (!is_client_expired(clp))
+ renew_client_locked(clp);
+ spin_unlock(&nn->client_lock);
+}
+
+static __be32 nfsd4_get_session_locked(struct nfsd4_session *ses)
+{
+ __be32 status;
+
+ if (is_session_dead(ses))
+ return nfserr_badsession;
+ status = get_client_locked(ses->se_client);
+ if (status)
+ return status;
+ atomic_inc(&ses->se_ref);
+ return nfs_ok;
+}
+
+static void nfsd4_put_session_locked(struct nfsd4_session *ses)
+{
+ struct nfs4_client *clp = ses->se_client;
+ struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
+
+ lockdep_assert_held(&nn->client_lock);
+
+ if (atomic_dec_and_test(&ses->se_ref) && is_session_dead(ses))
+ free_session(ses);
+ put_client_renew_locked(clp);
+}
+
+static void nfsd4_put_session(struct nfsd4_session *ses)
+{
+ struct nfs4_client *clp = ses->se_client;
+ struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
+
+ spin_lock(&nn->client_lock);
+ nfsd4_put_session_locked(ses);
+ spin_unlock(&nn->client_lock);
+}
+
+static inline struct nfs4_stateowner *
+nfs4_get_stateowner(struct nfs4_stateowner *sop)
+{
+ atomic_inc(&sop->so_count);
+ return sop;
+}
+
+static int
+same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner)
+{
+ return (sop->so_owner.len == owner->len) &&
+ 0 == memcmp(sop->so_owner.data, owner->data, owner->len);
+}
+
+static struct nfs4_openowner *
+find_openstateowner_str_locked(unsigned int hashval, struct nfsd4_open *open,
+ struct nfs4_client *clp)
+{
+ struct nfs4_stateowner *so;
+
+ lockdep_assert_held(&clp->cl_lock);
+
+ list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[hashval],
+ so_strhash) {
+ if (!so->so_is_open_owner)
+ continue;
+ if (same_owner_str(so, &open->op_owner))
+ return openowner(nfs4_get_stateowner(so));
+ }
+ return NULL;
+}
+
+static struct nfs4_openowner *
+find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open,
+ struct nfs4_client *clp)
+{
+ struct nfs4_openowner *oo;
+
+ spin_lock(&clp->cl_lock);
+ oo = find_openstateowner_str_locked(hashval, open, clp);
+ spin_unlock(&clp->cl_lock);
+ return oo;
+}
+
+static inline u32
+opaque_hashval(const void *ptr, int nbytes)
+{
+ unsigned char *cptr = (unsigned char *) ptr;
+
+ u32 x = 0;
+ while (nbytes--) {
+ x *= 37;
+ x += *cptr++;
+ }
+ return x;
+}
+
+static void nfsd4_free_file_rcu(struct rcu_head *rcu)
+{
+ struct nfs4_file *fp = container_of(rcu, struct nfs4_file, fi_rcu);
+
+ kmem_cache_free(file_slab, fp);
+}
+
+void
+put_nfs4_file(struct nfs4_file *fi)
+{
+ might_lock(&state_lock);
+
+ if (atomic_dec_and_lock(&fi->fi_ref, &state_lock)) {
+ hlist_del_rcu(&fi->fi_hash);
+ spin_unlock(&state_lock);
+ WARN_ON_ONCE(!list_empty(&fi->fi_clnt_odstate));
+ WARN_ON_ONCE(!list_empty(&fi->fi_delegations));
+ call_rcu(&fi->fi_rcu, nfsd4_free_file_rcu);
+ }
+}
+
+static struct file *
+__nfs4_get_fd(struct nfs4_file *f, int oflag)
+{
+ if (f->fi_fds[oflag])
+ return get_file(f->fi_fds[oflag]);
+ return NULL;
+}
+
+static struct file *
+find_writeable_file_locked(struct nfs4_file *f)
+{
+ struct file *ret;
+
+ lockdep_assert_held(&f->fi_lock);
+
+ ret = __nfs4_get_fd(f, O_WRONLY);
+ if (!ret)
+ ret = __nfs4_get_fd(f, O_RDWR);
+ return ret;
+}
+
+static struct file *
+find_writeable_file(struct nfs4_file *f)
+{
+ struct file *ret;
+
+ spin_lock(&f->fi_lock);
+ ret = find_writeable_file_locked(f);
+ spin_unlock(&f->fi_lock);
+
+ return ret;
+}
+
+static struct file *find_readable_file_locked(struct nfs4_file *f)
+{
+ struct file *ret;
+
+ lockdep_assert_held(&f->fi_lock);
+
+ ret = __nfs4_get_fd(f, O_RDONLY);
+ if (!ret)
+ ret = __nfs4_get_fd(f, O_RDWR);
+ return ret;
+}
+
+static struct file *
+find_readable_file(struct nfs4_file *f)
+{
+ struct file *ret;
+
+ spin_lock(&f->fi_lock);
+ ret = find_readable_file_locked(f);
+ spin_unlock(&f->fi_lock);
+
+ return ret;
+}
+
+struct file *
+find_any_file(struct nfs4_file *f)
+{
+ struct file *ret;
+
+ spin_lock(&f->fi_lock);
+ ret = __nfs4_get_fd(f, O_RDWR);
+ if (!ret) {
+ ret = __nfs4_get_fd(f, O_WRONLY);
+ if (!ret)
+ ret = __nfs4_get_fd(f, O_RDONLY);
+ }
+ spin_unlock(&f->fi_lock);
+ return ret;
+}
+
+static atomic_long_t num_delegations;
+unsigned long max_delegations;
+
+/*
+ * Open owner state (share locks)
+ */
+
+/* hash tables for lock and open owners */
+#define OWNER_HASH_BITS 8
+#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
+#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
+
+static unsigned int ownerstr_hashval(struct xdr_netobj *ownername)
+{
+ unsigned int ret;
+
+ ret = opaque_hashval(ownername->data, ownername->len);
+ return ret & OWNER_HASH_MASK;
+}
+
+/* hash table for nfs4_file */
+#define FILE_HASH_BITS 8
+#define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
+
+static unsigned int nfsd_fh_hashval(struct knfsd_fh *fh)
+{
+ return jhash2(fh->fh_base.fh_pad, XDR_QUADLEN(fh->fh_size), 0);
+}
+
+static unsigned int file_hashval(struct knfsd_fh *fh)
+{
+ return nfsd_fh_hashval(fh) & (FILE_HASH_SIZE - 1);
+}
+
+static struct hlist_head file_hashtbl[FILE_HASH_SIZE];
+
+static void
+__nfs4_file_get_access(struct nfs4_file *fp, u32 access)
+{
+ lockdep_assert_held(&fp->fi_lock);
+
+ if (access & NFS4_SHARE_ACCESS_WRITE)
+ atomic_inc(&fp->fi_access[O_WRONLY]);
+ if (access & NFS4_SHARE_ACCESS_READ)
+ atomic_inc(&fp->fi_access[O_RDONLY]);
+}
+
+static __be32
+nfs4_file_get_access(struct nfs4_file *fp, u32 access)
+{
+ lockdep_assert_held(&fp->fi_lock);
+
+ /* Does this access mode make sense? */
+ if (access & ~NFS4_SHARE_ACCESS_BOTH)
+ return nfserr_inval;
+
+ /* Does it conflict with a deny mode already set? */
+ if ((access & fp->fi_share_deny) != 0)
+ return nfserr_share_denied;
+
+ __nfs4_file_get_access(fp, access);
+ return nfs_ok;
+}
+
+static __be32 nfs4_file_check_deny(struct nfs4_file *fp, u32 deny)
+{
+ /* Common case is that there is no deny mode. */
+ if (deny) {
+ /* Does this deny mode make sense? */
+ if (deny & ~NFS4_SHARE_DENY_BOTH)
+ return nfserr_inval;
+
+ if ((deny & NFS4_SHARE_DENY_READ) &&
+ atomic_read(&fp->fi_access[O_RDONLY]))
+ return nfserr_share_denied;
+
+ if ((deny & NFS4_SHARE_DENY_WRITE) &&
+ atomic_read(&fp->fi_access[O_WRONLY]))
+ return nfserr_share_denied;
+ }
+ return nfs_ok;
+}
+
+static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
+{
+ might_lock(&fp->fi_lock);
+
+ if (atomic_dec_and_lock(&fp->fi_access[oflag], &fp->fi_lock)) {
+ struct file *f1 = NULL;
+ struct file *f2 = NULL;
+
+ swap(f1, fp->fi_fds[oflag]);
+ if (atomic_read(&fp->fi_access[1 - oflag]) == 0)
+ swap(f2, fp->fi_fds[O_RDWR]);
+ spin_unlock(&fp->fi_lock);
+ if (f1)
+ fput(f1);
+ if (f2)
+ fput(f2);
+ }
+}
+
+static void nfs4_file_put_access(struct nfs4_file *fp, u32 access)
+{
+ WARN_ON_ONCE(access & ~NFS4_SHARE_ACCESS_BOTH);
+
+ if (access & NFS4_SHARE_ACCESS_WRITE)
+ __nfs4_file_put_access(fp, O_WRONLY);
+ if (access & NFS4_SHARE_ACCESS_READ)
+ __nfs4_file_put_access(fp, O_RDONLY);
+}
+
+/*
+ * Allocate a new open/delegation state counter. This is needed for
+ * pNFS for proper return on close semantics.
+ *
+ * Note that we only allocate it for pNFS-enabled exports, otherwise
+ * all pointers to struct nfs4_clnt_odstate are always NULL.
+ */
+static struct nfs4_clnt_odstate *
+alloc_clnt_odstate(struct nfs4_client *clp)
+{
+ struct nfs4_clnt_odstate *co;
+
+ co = kmem_cache_zalloc(odstate_slab, GFP_KERNEL);
+ if (co) {
+ co->co_client = clp;
+ atomic_set(&co->co_odcount, 1);
+ }
+ return co;
+}
+
+static void
+hash_clnt_odstate_locked(struct nfs4_clnt_odstate *co)
+{
+ struct nfs4_file *fp = co->co_file;
+
+ lockdep_assert_held(&fp->fi_lock);
+ list_add(&co->co_perfile, &fp->fi_clnt_odstate);
+}
+
+static inline void
+get_clnt_odstate(struct nfs4_clnt_odstate *co)
+{
+ if (co)
+ atomic_inc(&co->co_odcount);
+}
+
+static void
+put_clnt_odstate(struct nfs4_clnt_odstate *co)
+{
+ struct nfs4_file *fp;
+
+ if (!co)
+ return;
+
+ fp = co->co_file;
+ if (atomic_dec_and_lock(&co->co_odcount, &fp->fi_lock)) {
+ list_del(&co->co_perfile);
+ spin_unlock(&fp->fi_lock);
+
+ nfsd4_return_all_file_layouts(co->co_client, fp);
+ kmem_cache_free(odstate_slab, co);
+ }
+}
+
+static struct nfs4_clnt_odstate *
+find_or_hash_clnt_odstate(struct nfs4_file *fp, struct nfs4_clnt_odstate *new)
+{
+ struct nfs4_clnt_odstate *co;
+ struct nfs4_client *cl;
+
+ if (!new)
+ return NULL;
+
+ cl = new->co_client;
+
+ spin_lock(&fp->fi_lock);
+ list_for_each_entry(co, &fp->fi_clnt_odstate, co_perfile) {
+ if (co->co_client == cl) {
+ get_clnt_odstate(co);
+ goto out;
+ }
+ }
+ co = new;
+ co->co_file = fp;
+ hash_clnt_odstate_locked(new);
+out:
+ spin_unlock(&fp->fi_lock);
+ return co;
+}
+
+struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab,
+ void (*sc_free)(struct nfs4_stid *))
+{
+ struct nfs4_stid *stid;
+ int new_id;
+
+ stid = kmem_cache_zalloc(slab, GFP_KERNEL);
+ if (!stid)
+ return NULL;
+
+ idr_preload(GFP_KERNEL);
+ spin_lock(&cl->cl_lock);
+ new_id = idr_alloc_cyclic(&cl->cl_stateids, stid, 0, 0, GFP_NOWAIT);
+ spin_unlock(&cl->cl_lock);
+ idr_preload_end();
+ if (new_id < 0)
+ goto out_free;
+
+ stid->sc_free = sc_free;
+ stid->sc_client = cl;
+ stid->sc_stateid.si_opaque.so_id = new_id;
+ stid->sc_stateid.si_opaque.so_clid = cl->cl_clientid;
+ /* Will be incremented before return to client: */
+ atomic_set(&stid->sc_count, 1);
+ spin_lock_init(&stid->sc_lock);
+
+ /*
+ * It shouldn't be a problem to reuse an opaque stateid value.
+ * I don't think it is for 4.1. But with 4.0 I worry that, for
+ * example, a stray write retransmission could be accepted by
+ * the server when it should have been rejected. Therefore,
+ * adopt a trick from the sctp code to attempt to maximize the
+ * amount of time until an id is reused, by ensuring they always
+ * "increase" (mod INT_MAX):
+ */
+ return stid;
+out_free:
+ kmem_cache_free(slab, stid);
+ return NULL;
+}
+
+static struct nfs4_ol_stateid * nfs4_alloc_open_stateid(struct nfs4_client *clp)
+{
+ struct nfs4_stid *stid;
+
+ stid = nfs4_alloc_stid(clp, stateid_slab, nfs4_free_ol_stateid);
+ if (!stid)
+ return NULL;
+
+ return openlockstateid(stid);
+}
+
+static void nfs4_free_deleg(struct nfs4_stid *stid)
+{
+ kmem_cache_free(deleg_slab, stid);
+ atomic_long_dec(&num_delegations);
+}
+
+/*
+ * When we recall a delegation, we should be careful not to hand it
+ * out again straight away.
+ * To ensure this we keep a pair of bloom filters ('new' and 'old')
+ * in which the filehandles of recalled delegations are "stored".
+ * If a filehandle appear in either filter, a delegation is blocked.
+ * When a delegation is recalled, the filehandle is stored in the "new"
+ * filter.
+ * Every 30 seconds we swap the filters and clear the "new" one,
+ * unless both are empty of course.
+ *
+ * Each filter is 256 bits. We hash the filehandle to 32bit and use the
+ * low 3 bytes as hash-table indices.
+ *
+ * 'blocked_delegations_lock', which is always taken in block_delegations(),
+ * is used to manage concurrent access. Testing does not need the lock
+ * except when swapping the two filters.
+ */
+static DEFINE_SPINLOCK(blocked_delegations_lock);
+static struct bloom_pair {
+ int entries, old_entries;
+ time_t swap_time;
+ int new; /* index into 'set' */
+ DECLARE_BITMAP(set[2], 256);
+} blocked_delegations;
+
+static int delegation_blocked(struct knfsd_fh *fh)
+{
+ u32 hash;
+ struct bloom_pair *bd = &blocked_delegations;
+
+ if (bd->entries == 0)
+ return 0;
+ if (seconds_since_boot() - bd->swap_time > 30) {
+ spin_lock(&blocked_delegations_lock);
+ if (seconds_since_boot() - bd->swap_time > 30) {
+ bd->entries -= bd->old_entries;
+ bd->old_entries = bd->entries;
+ memset(bd->set[bd->new], 0,
+ sizeof(bd->set[0]));
+ bd->new = 1-bd->new;
+ bd->swap_time = seconds_since_boot();
+ }
+ spin_unlock(&blocked_delegations_lock);
+ }
+ hash = jhash(&fh->fh_base, fh->fh_size, 0);
+ if (test_bit(hash&255, bd->set[0]) &&
+ test_bit((hash>>8)&255, bd->set[0]) &&
+ test_bit((hash>>16)&255, bd->set[0]))
+ return 1;
+
+ if (test_bit(hash&255, bd->set[1]) &&
+ test_bit((hash>>8)&255, bd->set[1]) &&
+ test_bit((hash>>16)&255, bd->set[1]))
+ return 1;
+
+ return 0;
+}
+
+static void block_delegations(struct knfsd_fh *fh)
+{
+ u32 hash;
+ struct bloom_pair *bd = &blocked_delegations;
+
+ hash = jhash(&fh->fh_base, fh->fh_size, 0);
+
+ spin_lock(&blocked_delegations_lock);
+ __set_bit(hash&255, bd->set[bd->new]);
+ __set_bit((hash>>8)&255, bd->set[bd->new]);
+ __set_bit((hash>>16)&255, bd->set[bd->new]);
+ if (bd->entries == 0)
+ bd->swap_time = seconds_since_boot();
+ bd->entries += 1;
+ spin_unlock(&blocked_delegations_lock);
+}
+
+static struct nfs4_delegation *
+alloc_init_deleg(struct nfs4_client *clp, struct svc_fh *current_fh,
+ struct nfs4_clnt_odstate *odstate)
+{
+ struct nfs4_delegation *dp;
+ long n;
+
+ dprintk("NFSD alloc_init_deleg\n");
+ n = atomic_long_inc_return(&num_delegations);
+ if (n < 0 || n > max_delegations)
+ goto out_dec;
+ if (delegation_blocked(¤t_fh->fh_handle))
+ goto out_dec;
+ dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab, nfs4_free_deleg));
+ if (dp == NULL)
+ goto out_dec;
+
+ /*
+ * delegation seqid's are never incremented. The 4.1 special
+ * meaning of seqid 0 isn't meaningful, really, but let's avoid
+ * 0 anyway just for consistency and use 1:
+ */
+ dp->dl_stid.sc_stateid.si_generation = 1;
+ INIT_LIST_HEAD(&dp->dl_perfile);
+ INIT_LIST_HEAD(&dp->dl_perclnt);
+ INIT_LIST_HEAD(&dp->dl_recall_lru);
+ dp->dl_clnt_odstate = odstate;
+ get_clnt_odstate(odstate);
+ dp->dl_type = NFS4_OPEN_DELEGATE_READ;
+ dp->dl_retries = 1;
+ nfsd4_init_cb(&dp->dl_recall, dp->dl_stid.sc_client,
+ &nfsd4_cb_recall_ops, NFSPROC4_CLNT_CB_RECALL);
+ return dp;
+out_dec:
+ atomic_long_dec(&num_delegations);
+ return NULL;
+}
+
+void
+nfs4_put_stid(struct nfs4_stid *s)
+{
+ struct nfs4_file *fp = s->sc_file;
+ struct nfs4_client *clp = s->sc_client;
+
+ might_lock(&clp->cl_lock);
+
+ if (!atomic_dec_and_lock(&s->sc_count, &clp->cl_lock)) {
+ wake_up_all(&close_wq);
+ return;
+ }
+ idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
+ spin_unlock(&clp->cl_lock);
+ s->sc_free(s);
+ if (fp)
+ put_nfs4_file(fp);
+}
+
+void
+nfs4_inc_and_copy_stateid(stateid_t *dst, struct nfs4_stid *stid)
+{
+ stateid_t *src = &stid->sc_stateid;
+
+ spin_lock(&stid->sc_lock);
+ if (unlikely(++src->si_generation == 0))
+ src->si_generation = 1;
+ memcpy(dst, src, sizeof(*dst));
+ spin_unlock(&stid->sc_lock);
+}
+
+static void nfs4_put_deleg_lease(struct nfs4_file *fp)
+{
+ struct file *filp = NULL;
+
+ spin_lock(&fp->fi_lock);
+ if (fp->fi_deleg_file && --fp->fi_delegees == 0)
+ swap(filp, fp->fi_deleg_file);
+ spin_unlock(&fp->fi_lock);
+
+ if (filp) {
+ vfs_setlease(filp, F_UNLCK, NULL, (void **)&fp);
+ fput(filp);
+ }
+}
+
+void nfs4_unhash_stid(struct nfs4_stid *s)
+{
+ s->sc_type = 0;
+}
+
+/**
+ * nfs4_get_existing_delegation - Discover if this delegation already exists
+ * @clp: a pointer to the nfs4_client we're granting a delegation to
+ * @fp: a pointer to the nfs4_file we're granting a delegation on
+ *
+ * Return:
+ * On success: NULL if an existing delegation was not found.
+ *
+ * On error: -EAGAIN if one was previously granted to this nfs4_client
+ * for this nfs4_file.
+ *
+ */
+
+static int
+nfs4_get_existing_delegation(struct nfs4_client *clp, struct nfs4_file *fp)
+{
+ struct nfs4_delegation *searchdp = NULL;
+ struct nfs4_client *searchclp = NULL;
+
+ lockdep_assert_held(&state_lock);
+ lockdep_assert_held(&fp->fi_lock);
+
+ list_for_each_entry(searchdp, &fp->fi_delegations, dl_perfile) {
+ searchclp = searchdp->dl_stid.sc_client;
+ if (clp == searchclp) {
+ return -EAGAIN;
+ }
+ }
+ return 0;
+}
+
+/**
+ * hash_delegation_locked - Add a delegation to the appropriate lists
+ * @dp: a pointer to the nfs4_delegation we are adding.
+ * @fp: a pointer to the nfs4_file we're granting a delegation on
+ *
+ * Return:
+ * On success: NULL if the delegation was successfully hashed.
+ *
+ * On error: -EAGAIN if one was previously granted to this
+ * nfs4_client for this nfs4_file. Delegation is not hashed.
+ *
+ */
+
+static int
+hash_delegation_locked(struct nfs4_delegation *dp, struct nfs4_file *fp)
+{
+ int status;
+ struct nfs4_client *clp = dp->dl_stid.sc_client;
+
+ lockdep_assert_held(&state_lock);
+ lockdep_assert_held(&fp->fi_lock);
+
+ status = nfs4_get_existing_delegation(clp, fp);
+ if (status)
+ return status;
+ ++fp->fi_delegees;
+ atomic_inc(&dp->dl_stid.sc_count);
+ dp->dl_stid.sc_type = NFS4_DELEG_STID;
+ list_add(&dp->dl_perfile, &fp->fi_delegations);
+ list_add(&dp->dl_perclnt, &clp->cl_delegations);
+ return 0;
+}
+
+static bool
+unhash_delegation_locked(struct nfs4_delegation *dp)
+{
+ struct nfs4_file *fp = dp->dl_stid.sc_file;
+
+ lockdep_assert_held(&state_lock);
+
+ if (list_empty(&dp->dl_perfile))
+ return false;
+
+ dp->dl_stid.sc_type = NFS4_CLOSED_DELEG_STID;
+ /* Ensure that deleg break won't try to requeue it */
+ ++dp->dl_time;
+ spin_lock(&fp->fi_lock);
+ list_del_init(&dp->dl_perclnt);
+ list_del_init(&dp->dl_recall_lru);
+ list_del_init(&dp->dl_perfile);
+ spin_unlock(&fp->fi_lock);
+ return true;
+}
+
+static void destroy_delegation(struct nfs4_delegation *dp)
+{
+ bool unhashed;
+
+ spin_lock(&state_lock);
+ unhashed = unhash_delegation_locked(dp);
+ spin_unlock(&state_lock);
+ if (unhashed) {
+ put_clnt_odstate(dp->dl_clnt_odstate);
+ nfs4_put_deleg_lease(dp->dl_stid.sc_file);
+ nfs4_put_stid(&dp->dl_stid);
+ }
+}
+
+static void revoke_delegation(struct nfs4_delegation *dp)
+{
+ struct nfs4_client *clp = dp->dl_stid.sc_client;
+
+ WARN_ON(!list_empty(&dp->dl_recall_lru));
+
+ put_clnt_odstate(dp->dl_clnt_odstate);
+ nfs4_put_deleg_lease(dp->dl_stid.sc_file);
+
+ if (clp->cl_minorversion == 0)
+ nfs4_put_stid(&dp->dl_stid);
+ else {
+ dp->dl_stid.sc_type = NFS4_REVOKED_DELEG_STID;
+ spin_lock(&clp->cl_lock);
+ list_add(&dp->dl_recall_lru, &clp->cl_revoked);
+ spin_unlock(&clp->cl_lock);
+ }
+}
+
+/*
+ * SETCLIENTID state
+ */
+
+static unsigned int clientid_hashval(u32 id)
+{
+ return id & CLIENT_HASH_MASK;
+}
+
+static unsigned int clientstr_hashval(const char *name)
+{
+ return opaque_hashval(name, 8) & CLIENT_HASH_MASK;
+}
+
+/*
+ * We store the NONE, READ, WRITE, and BOTH bits separately in the
+ * st_{access,deny}_bmap field of the stateid, in order to track not
+ * only what share bits are currently in force, but also what
+ * combinations of share bits previous opens have used. This allows us
+ * to enforce the recommendation of rfc 3530 14.2.19 that the server
+ * return an error if the client attempt to downgrade to a combination
+ * of share bits not explicable by closing some of its previous opens.
+ *
+ * XXX: This enforcement is actually incomplete, since we don't keep
+ * track of access/deny bit combinations; so, e.g., we allow:
+ *
+ * OPEN allow read, deny write
+ * OPEN allow both, deny none
+ * DOWNGRADE allow read, deny none
+ *
+ * which we should reject.
+ */
+static unsigned int
+bmap_to_share_mode(unsigned long bmap) {
+ int i;
+ unsigned int access = 0;
+
+ for (i = 1; i < 4; i++) {
+ if (test_bit(i, &bmap))
+ access |= i;
+ }
+ return access;
+}
+
+/* set share access for a given stateid */
+static inline void
+set_access(u32 access, struct nfs4_ol_stateid *stp)
+{
+ unsigned char mask = 1 << access;
+
+ WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
+ stp->st_access_bmap |= mask;
+}
+
+/* clear share access for a given stateid */
+static inline void
+clear_access(u32 access, struct nfs4_ol_stateid *stp)
+{
+ unsigned char mask = 1 << access;
+
+ WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
+ stp->st_access_bmap &= ~mask;
+}
+
+/* test whether a given stateid has access */
+static inline bool
+test_access(u32 access, struct nfs4_ol_stateid *stp)
+{
+ unsigned char mask = 1 << access;
+
+ return (bool)(stp->st_access_bmap & mask);
+}
+
+/* set share deny for a given stateid */
+static inline void
+set_deny(u32 deny, struct nfs4_ol_stateid *stp)
+{
+ unsigned char mask = 1 << deny;
+
+ WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
+ stp->st_deny_bmap |= mask;
+}
+
+/* clear share deny for a given stateid */
+static inline void
+clear_deny(u32 deny, struct nfs4_ol_stateid *stp)
+{
+ unsigned char mask = 1 << deny;
+
+ WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
+ stp->st_deny_bmap &= ~mask;
+}
+
+/* test whether a given stateid is denying specific access */
+static inline bool
+test_deny(u32 deny, struct nfs4_ol_stateid *stp)
+{
+ unsigned char mask = 1 << deny;
+
+ return (bool)(stp->st_deny_bmap & mask);
+}
+
+static int nfs4_access_to_omode(u32 access)
+{
+ switch (access & NFS4_SHARE_ACCESS_BOTH) {
+ case NFS4_SHARE_ACCESS_READ:
+ return O_RDONLY;
+ case NFS4_SHARE_ACCESS_WRITE:
+ return O_WRONLY;
+ case NFS4_SHARE_ACCESS_BOTH:
+ return O_RDWR;
+ }
+ WARN_ON_ONCE(1);
+ return O_RDONLY;
+}
+
+/*
+ * A stateid that had a deny mode associated with it is being released
+ * or downgraded. Recalculate the deny mode on the file.
+ */
+static void
+recalculate_deny_mode(struct nfs4_file *fp)
+{
+ struct nfs4_ol_stateid *stp;
+
+ spin_lock(&fp->fi_lock);
+ fp->fi_share_deny = 0;
+ list_for_each_entry(stp, &fp->fi_stateids, st_perfile)
+ fp->fi_share_deny |= bmap_to_share_mode(stp->st_deny_bmap);
+ spin_unlock(&fp->fi_lock);
+}
+
+static void
+reset_union_bmap_deny(u32 deny, struct nfs4_ol_stateid *stp)
+{
+ int i;
+ bool change = false;
+
+ for (i = 1; i < 4; i++) {
+ if ((i & deny) != i) {
+ change = true;
+ clear_deny(i, stp);
+ }
+ }
+
+ /* Recalculate per-file deny mode if there was a change */
+ if (change)
+ recalculate_deny_mode(stp->st_stid.sc_file);
+}
+
+/* release all access and file references for a given stateid */
+static void
+release_all_access(struct nfs4_ol_stateid *stp)
+{
+ int i;
+ struct nfs4_file *fp = stp->st_stid.sc_file;
+
+ if (fp && stp->st_deny_bmap != 0)
+ recalculate_deny_mode(fp);
+
+ for (i = 1; i < 4; i++) {
+ if (test_access(i, stp))
+ nfs4_file_put_access(stp->st_stid.sc_file, i);
+ clear_access(i, stp);
+ }
+}
+
+static inline void nfs4_free_stateowner(struct nfs4_stateowner *sop)
+{
+ kfree(sop->so_owner.data);
+ sop->so_ops->so_free(sop);
+}
+
+static void nfs4_put_stateowner(struct nfs4_stateowner *sop)
+{
+ struct nfs4_client *clp = sop->so_client;
+
+ might_lock(&clp->cl_lock);
+
+ if (!atomic_dec_and_lock(&sop->so_count, &clp->cl_lock))
+ return;
+ sop->so_ops->so_unhash(sop);
+ spin_unlock(&clp->cl_lock);
+ nfs4_free_stateowner(sop);
+}
+
+static bool unhash_ol_stateid(struct nfs4_ol_stateid *stp)
+{
+ struct nfs4_file *fp = stp->st_stid.sc_file;
+
+ lockdep_assert_held(&stp->st_stateowner->so_client->cl_lock);
+
+ if (list_empty(&stp->st_perfile))
+ return false;
+
+ spin_lock(&fp->fi_lock);
+ list_del_init(&stp->st_perfile);
+ spin_unlock(&fp->fi_lock);
+ list_del(&stp->st_perstateowner);
+ return true;
+}
+
+static void nfs4_free_ol_stateid(struct nfs4_stid *stid)
+{
+ struct nfs4_ol_stateid *stp = openlockstateid(stid);
+
+ put_clnt_odstate(stp->st_clnt_odstate);
+ release_all_access(stp);
+ if (stp->st_stateowner)
+ nfs4_put_stateowner(stp->st_stateowner);
+ kmem_cache_free(stateid_slab, stid);
+}
+
+static void nfs4_free_lock_stateid(struct nfs4_stid *stid)
+{
+ struct nfs4_ol_stateid *stp = openlockstateid(stid);
+ struct nfs4_lockowner *lo = lockowner(stp->st_stateowner);
+ struct file *file;
+
+ file = find_any_file(stp->st_stid.sc_file);
+ if (file)
+ filp_close(file, (fl_owner_t)lo);
+ nfs4_free_ol_stateid(stid);
+}
+
+/*
+ * Put the persistent reference to an already unhashed generic stateid, while
+ * holding the cl_lock. If it's the last reference, then put it onto the
+ * reaplist for later destruction.
+ */
+static void put_ol_stateid_locked(struct nfs4_ol_stateid *stp,
+ struct list_head *reaplist)
+{
+ struct nfs4_stid *s = &stp->st_stid;
+ struct nfs4_client *clp = s->sc_client;
+
+ lockdep_assert_held(&clp->cl_lock);
+
+ WARN_ON_ONCE(!list_empty(&stp->st_locks));
+
+ if (!atomic_dec_and_test(&s->sc_count)) {
+ wake_up_all(&close_wq);
+ return;
+ }
+
+ idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
+ list_add(&stp->st_locks, reaplist);
+}
+
+static bool unhash_lock_stateid(struct nfs4_ol_stateid *stp)
+{
+ lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
+
+ list_del_init(&stp->st_locks);
+ nfs4_unhash_stid(&stp->st_stid);
+ return unhash_ol_stateid(stp);
+}
+
+static void release_lock_stateid(struct nfs4_ol_stateid *stp)
+{
+ struct nfs4_client *clp = stp->st_stid.sc_client;
+ bool unhashed;
+
+ spin_lock(&clp->cl_lock);
+ unhashed = unhash_lock_stateid(stp);
+ spin_unlock(&clp->cl_lock);
+ if (unhashed)
+ nfs4_put_stid(&stp->st_stid);
+}
+
+static void unhash_lockowner_locked(struct nfs4_lockowner *lo)
+{
+ struct nfs4_client *clp = lo->lo_owner.so_client;
+
+ lockdep_assert_held(&clp->cl_lock);
+
+ list_del_init(&lo->lo_owner.so_strhash);
+}
+
+/*
+ * Free a list of generic stateids that were collected earlier after being
+ * fully unhashed.
+ */
+static void
+free_ol_stateid_reaplist(struct list_head *reaplist)
+{
+ struct nfs4_ol_stateid *stp;
+ struct nfs4_file *fp;
+
+ might_sleep();
+
+ while (!list_empty(reaplist)) {
+ stp = list_first_entry(reaplist, struct nfs4_ol_stateid,
+ st_locks);
+ list_del(&stp->st_locks);
+ fp = stp->st_stid.sc_file;
+ stp->st_stid.sc_free(&stp->st_stid);
+ if (fp)
+ put_nfs4_file(fp);
+ }
+}
+
+static void release_open_stateid_locks(struct nfs4_ol_stateid *open_stp,
+ struct list_head *reaplist)
+{
+ struct nfs4_ol_stateid *stp;
+
+ lockdep_assert_held(&open_stp->st_stid.sc_client->cl_lock);
+
+ while (!list_empty(&open_stp->st_locks)) {
+ stp = list_entry(open_stp->st_locks.next,
+ struct nfs4_ol_stateid, st_locks);
+ WARN_ON(!unhash_lock_stateid(stp));
+ put_ol_stateid_locked(stp, reaplist);
+ }
+}
+
+static bool unhash_open_stateid(struct nfs4_ol_stateid *stp,
+ struct list_head *reaplist)
+{
+ bool unhashed;
+
+ lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
+
+ unhashed = unhash_ol_stateid(stp);
+ release_open_stateid_locks(stp, reaplist);
+ return unhashed;
+}
+
+static void release_open_stateid(struct nfs4_ol_stateid *stp)
+{
+ LIST_HEAD(reaplist);
+
+ spin_lock(&stp->st_stid.sc_client->cl_lock);
+ if (unhash_open_stateid(stp, &reaplist))
+ put_ol_stateid_locked(stp, &reaplist);
+ spin_unlock(&stp->st_stid.sc_client->cl_lock);
+ free_ol_stateid_reaplist(&reaplist);
+}
+
+static void unhash_openowner_locked(struct nfs4_openowner *oo)
+{
+ struct nfs4_client *clp = oo->oo_owner.so_client;
+
+ lockdep_assert_held(&clp->cl_lock);
+
+ list_del_init(&oo->oo_owner.so_strhash);
+ list_del_init(&oo->oo_perclient);
+}
+
+static void release_last_closed_stateid(struct nfs4_openowner *oo)
+{
+ struct nfsd_net *nn = net_generic(oo->oo_owner.so_client->net,
+ nfsd_net_id);
+ struct nfs4_ol_stateid *s;
+
+ spin_lock(&nn->client_lock);
+ s = oo->oo_last_closed_stid;
+ if (s) {
+ list_del_init(&oo->oo_close_lru);
+ oo->oo_last_closed_stid = NULL;
+ }
+ spin_unlock(&nn->client_lock);
+ if (s)
+ nfs4_put_stid(&s->st_stid);
+}
+
+static void release_openowner(struct nfs4_openowner *oo)
+{
+ struct nfs4_ol_stateid *stp;
+ struct nfs4_client *clp = oo->oo_owner.so_client;
+ struct list_head reaplist;
+
+ INIT_LIST_HEAD(&reaplist);
+
+ spin_lock(&clp->cl_lock);
+ unhash_openowner_locked(oo);
+ while (!list_empty(&oo->oo_owner.so_stateids)) {
+ stp = list_first_entry(&oo->oo_owner.so_stateids,
+ struct nfs4_ol_stateid, st_perstateowner);
+ if (unhash_open_stateid(stp, &reaplist))
+ put_ol_stateid_locked(stp, &reaplist);
+ }
+ spin_unlock(&clp->cl_lock);
+ free_ol_stateid_reaplist(&reaplist);
+ release_last_closed_stateid(oo);
+ nfs4_put_stateowner(&oo->oo_owner);
+}
+
+static inline int
+hash_sessionid(struct nfs4_sessionid *sessionid)
+{
+ struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
+
+ return sid->sequence % SESSION_HASH_SIZE;
+}
+
+#ifdef CONFIG_SUNRPC_DEBUG
+static inline void
+dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
+{
+ u32 *ptr = (u32 *)(&sessionid->data[0]);
+ dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
+}
+#else
+static inline void
+dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
+{
+}
+#endif
+
+/*
+ * Bump the seqid on cstate->replay_owner, and clear replay_owner if it
+ * won't be used for replay.
+ */
+void nfsd4_bump_seqid(struct nfsd4_compound_state *cstate, __be32 nfserr)
+{
+ struct nfs4_stateowner *so = cstate->replay_owner;
+
+ if (nfserr == nfserr_replay_me)
+ return;
+
+ if (!seqid_mutating_err(ntohl(nfserr))) {
+ nfsd4_cstate_clear_replay(cstate);
+ return;
+ }
+ if (!so)
+ return;
+ if (so->so_is_open_owner)
+ release_last_closed_stateid(openowner(so));
+ so->so_seqid++;
+ return;
+}
+
+static void
+gen_sessionid(struct nfsd4_session *ses)
+{
+ struct nfs4_client *clp = ses->se_client;
+ struct nfsd4_sessionid *sid;
+
+ sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
+ sid->clientid = clp->cl_clientid;
+ sid->sequence = current_sessionid++;
+ sid->reserved = 0;
+}
+
+/*
+ * The protocol defines ca_maxresponssize_cached to include the size of
+ * the rpc header, but all we need to cache is the data starting after
+ * the end of the initial SEQUENCE operation--the rest we regenerate
+ * each time. Therefore we can advertise a ca_maxresponssize_cached
+ * value that is the number of bytes in our cache plus a few additional
+ * bytes. In order to stay on the safe side, and not promise more than
+ * we can cache, those additional bytes must be the minimum possible: 24
+ * bytes of rpc header (xid through accept state, with AUTH_NULL
+ * verifier), 12 for the compound header (with zero-length tag), and 44
+ * for the SEQUENCE op response:
+ */
+#define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44)
+
+static void
+free_session_slots(struct nfsd4_session *ses)
+{
+ int i;
+
+ for (i = 0; i < ses->se_fchannel.maxreqs; i++)
+ kfree(ses->se_slots[i]);
+}
+
+/*
+ * We don't actually need to cache the rpc and session headers, so we
+ * can allocate a little less for each slot:
+ */
+static inline u32 slot_bytes(struct nfsd4_channel_attrs *ca)
+{
+ u32 size;
+
+ if (ca->maxresp_cached < NFSD_MIN_HDR_SEQ_SZ)
+ size = 0;
+ else
+ size = ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
+ return size + sizeof(struct nfsd4_slot);
+}
+
+/*
+ * XXX: If we run out of reserved DRC memory we could (up to a point)
+ * re-negotiate active sessions and reduce their slot usage to make
+ * room for new connections. For now we just fail the create session.
+ */
+static u32 nfsd4_get_drc_mem(struct nfsd4_channel_attrs *ca)
+{
+ u32 slotsize = slot_bytes(ca);
+ u32 num = ca->maxreqs;
+ int avail;
+
+ spin_lock(&nfsd_drc_lock);
+ avail = min((unsigned long)NFSD_MAX_MEM_PER_SESSION,
+ nfsd_drc_max_mem - nfsd_drc_mem_used);
+ num = min_t(int, num, avail / slotsize);
+ nfsd_drc_mem_used += num * slotsize;
+ spin_unlock(&nfsd_drc_lock);
+
+ return num;
+}
+
+static void nfsd4_put_drc_mem(struct nfsd4_channel_attrs *ca)
+{
+ int slotsize = slot_bytes(ca);
+
+ spin_lock(&nfsd_drc_lock);
+ nfsd_drc_mem_used -= slotsize * ca->maxreqs;
+ spin_unlock(&nfsd_drc_lock);
+}
+
+static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fattrs,
+ struct nfsd4_channel_attrs *battrs)
+{
+ int numslots = fattrs->maxreqs;
+ int slotsize = slot_bytes(fattrs);
+ struct nfsd4_session *new;
+ int mem, i;
+
+ BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *)
+ + sizeof(struct nfsd4_session) > PAGE_SIZE);
+ mem = numslots * sizeof(struct nfsd4_slot *);
+
+ new = kzalloc(sizeof(*new) + mem, GFP_KERNEL);
+ if (!new)
+ return NULL;
+ /* allocate each struct nfsd4_slot and data cache in one piece */
+ for (i = 0; i < numslots; i++) {
+ new->se_slots[i] = kzalloc(slotsize, GFP_KERNEL);
+ if (!new->se_slots[i])
+ goto out_free;
+ }
+
+ memcpy(&new->se_fchannel, fattrs, sizeof(struct nfsd4_channel_attrs));
+ memcpy(&new->se_bchannel, battrs, sizeof(struct nfsd4_channel_attrs));
+
+ return new;
+out_free:
+ while (i--)
+ kfree(new->se_slots[i]);
+ kfree(new);
+ return NULL;
+}
+
+static void free_conn(struct nfsd4_conn *c)
+{
+ svc_xprt_put(c->cn_xprt);
+ kfree(c);
+}
+
+static void nfsd4_conn_lost(struct svc_xpt_user *u)
+{
+ struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
+ struct nfs4_client *clp = c->cn_session->se_client;
+
+ spin_lock(&clp->cl_lock);
+ if (!list_empty(&c->cn_persession)) {
+ list_del(&c->cn_persession);
+ free_conn(c);
+ }
+ nfsd4_probe_callback(clp);
+ spin_unlock(&clp->cl_lock);
+}
+
+static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
+{
+ struct nfsd4_conn *conn;
+
+ conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
+ if (!conn)
+ return NULL;
+ svc_xprt_get(rqstp->rq_xprt);
+ conn->cn_xprt = rqstp->rq_xprt;
+ conn->cn_flags = flags;
+ INIT_LIST_HEAD(&conn->cn_xpt_user.list);
+ return conn;
+}
+
+static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
+{
+ conn->cn_session = ses;
+ list_add(&conn->cn_persession, &ses->se_conns);
+}
+
+static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
+{
+ struct nfs4_client *clp = ses->se_client;
+
+ spin_lock(&clp->cl_lock);
+ __nfsd4_hash_conn(conn, ses);
+ spin_unlock(&clp->cl_lock);
+}
+
+static int nfsd4_register_conn(struct nfsd4_conn *conn)
+{
+ conn->cn_xpt_user.callback = nfsd4_conn_lost;
+ return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
+}
+
+static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, struct nfsd4_session *ses)
+{
+ int ret;
+
+ nfsd4_hash_conn(conn, ses);
+ ret = nfsd4_register_conn(conn);
+ if (ret)
+ /* oops; xprt is already down: */
+ nfsd4_conn_lost(&conn->cn_xpt_user);
+ /* We may have gained or lost a callback channel: */
+ nfsd4_probe_callback_sync(ses->se_client);
+}
+
+static struct nfsd4_conn *alloc_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_create_session *cses)
+{
+ u32 dir = NFS4_CDFC4_FORE;
+
+ if (cses->flags & SESSION4_BACK_CHAN)
+ dir |= NFS4_CDFC4_BACK;
+ return alloc_conn(rqstp, dir);
+}
+
+/* must be called under client_lock */
+static void nfsd4_del_conns(struct nfsd4_session *s)
+{
+ struct nfs4_client *clp = s->se_client;
+ struct nfsd4_conn *c;
+
+ spin_lock(&clp->cl_lock);
+ while (!list_empty(&s->se_conns)) {
+ c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
+ list_del_init(&c->cn_persession);
+ spin_unlock(&clp->cl_lock);
+
+ unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
+ free_conn(c);
+
+ spin_lock(&clp->cl_lock);
+ }
+ spin_unlock(&clp->cl_lock);
+}
+
+static void __free_session(struct nfsd4_session *ses)
+{
+ free_session_slots(ses);
+ kfree(ses);
+}
+
+static void free_session(struct nfsd4_session *ses)
+{
+ nfsd4_del_conns(ses);
+ nfsd4_put_drc_mem(&ses->se_fchannel);
+ __free_session(ses);
+}
+
+static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses)
+{
+ int idx;
+ struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
+
+ new->se_client = clp;
+ gen_sessionid(new);
+
+ INIT_LIST_HEAD(&new->se_conns);
+
+ new->se_cb_seq_nr = 1;
+ new->se_flags = cses->flags;
+ new->se_cb_prog = cses->callback_prog;
+ new->se_cb_sec = cses->cb_sec;
+ atomic_set(&new->se_ref, 0);
+ idx = hash_sessionid(&new->se_sessionid);
+ list_add(&new->se_hash, &nn->sessionid_hashtbl[idx]);
+ spin_lock(&clp->cl_lock);
+ list_add(&new->se_perclnt, &clp->cl_sessions);
+ spin_unlock(&clp->cl_lock);
+
+ {
+ struct sockaddr *sa = svc_addr(rqstp);
+ /*
+ * This is a little silly; with sessions there's no real
+ * use for the callback address. Use the peer address
+ * as a reasonable default for now, but consider fixing
+ * the rpc client not to require an address in the
+ * future:
+ */
+ rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
+ clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
+ }
+}
+
+/* caller must hold client_lock */
+static struct nfsd4_session *
+__find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net)
+{
+ struct nfsd4_session *elem;
+ int idx;
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+
+ lockdep_assert_held(&nn->client_lock);
+
+ dump_sessionid(__func__, sessionid);
+ idx = hash_sessionid(sessionid);
+ /* Search in the appropriate list */
+ list_for_each_entry(elem, &nn->sessionid_hashtbl[idx], se_hash) {
+ if (!memcmp(elem->se_sessionid.data, sessionid->data,
+ NFS4_MAX_SESSIONID_LEN)) {
+ return elem;
+ }
+ }
+
+ dprintk("%s: session not found\n", __func__);
+ return NULL;
+}
+
+static struct nfsd4_session *
+find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net,
+ __be32 *ret)
+{
+ struct nfsd4_session *session;
+ __be32 status = nfserr_badsession;
+
+ session = __find_in_sessionid_hashtbl(sessionid, net);
+ if (!session)
+ goto out;
+ status = nfsd4_get_session_locked(session);
+ if (status)
+ session = NULL;
+out:
+ *ret = status;
+ return session;
+}
+
+/* caller must hold client_lock */
+static void
+unhash_session(struct nfsd4_session *ses)
+{
+ struct nfs4_client *clp = ses->se_client;
+ struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
+
+ lockdep_assert_held(&nn->client_lock);
+
+ list_del(&ses->se_hash);
+ spin_lock(&ses->se_client->cl_lock);
+ list_del(&ses->se_perclnt);
+ spin_unlock(&ses->se_client->cl_lock);
+}
+
+/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
+static int
+STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
+{
+ /*
+ * We're assuming the clid was not given out from a boot
+ * precisely 2^32 (about 136 years) before this one. That seems
+ * a safe assumption:
+ */
+ if (clid->cl_boot == (u32)nn->boot_time)
+ return 0;
+ dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
+ clid->cl_boot, clid->cl_id, nn->boot_time);
+ return 1;
+}
+
+/*
+ * XXX Should we use a slab cache ?
+ * This type of memory management is somewhat inefficient, but we use it
+ * anyway since SETCLIENTID is not a common operation.
+ */
+static struct nfs4_client *alloc_client(struct xdr_netobj name)
+{
+ struct nfs4_client *clp;
+ int i;
+
+ clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
+ if (clp == NULL)
+ return NULL;
+ clp->cl_name.data = kmemdup(name.data, name.len, GFP_KERNEL);
+ if (clp->cl_name.data == NULL)
+ goto err_no_name;
+ clp->cl_ownerstr_hashtbl = kmalloc(sizeof(struct list_head) *
+ OWNER_HASH_SIZE, GFP_KERNEL);
+ if (!clp->cl_ownerstr_hashtbl)
+ goto err_no_hashtbl;
+ for (i = 0; i < OWNER_HASH_SIZE; i++)
+ INIT_LIST_HEAD(&clp->cl_ownerstr_hashtbl[i]);
+ clp->cl_name.len = name.len;
+ INIT_LIST_HEAD(&clp->cl_sessions);
+ idr_init(&clp->cl_stateids);
+ atomic_set(&clp->cl_refcount, 0);
+ clp->cl_cb_state = NFSD4_CB_UNKNOWN;
+ INIT_LIST_HEAD(&clp->cl_idhash);
+ INIT_LIST_HEAD(&clp->cl_openowners);
+ INIT_LIST_HEAD(&clp->cl_delegations);
+ INIT_LIST_HEAD(&clp->cl_lru);
+ INIT_LIST_HEAD(&clp->cl_revoked);
+#ifdef CONFIG_NFSD_PNFS
+ INIT_LIST_HEAD(&clp->cl_lo_states);
+#endif
+ spin_lock_init(&clp->cl_lock);
+ rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
+ return clp;
+err_no_hashtbl:
+ kfree(clp->cl_name.data);
+err_no_name:
+ kfree(clp);
+ return NULL;
+}
+
+static void
+free_client(struct nfs4_client *clp)
+{
+ while (!list_empty(&clp->cl_sessions)) {
+ struct nfsd4_session *ses;
+ ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
+ se_perclnt);
+ list_del(&ses->se_perclnt);
+ WARN_ON_ONCE(atomic_read(&ses->se_ref));
+ free_session(ses);
+ }
+ rpc_destroy_wait_queue(&clp->cl_cb_waitq);
+ free_svc_cred(&clp->cl_cred);
+ kfree(clp->cl_ownerstr_hashtbl);
+ kfree(clp->cl_name.data);
+ idr_destroy(&clp->cl_stateids);
+ kfree(clp);
+}
+
+/* must be called under the client_lock */
+static void
+unhash_client_locked(struct nfs4_client *clp)
+{
+ struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
+ struct nfsd4_session *ses;
+
+ lockdep_assert_held(&nn->client_lock);
+
+ /* Mark the client as expired! */
+ clp->cl_time = 0;
+ /* Make it invisible */
+ if (!list_empty(&clp->cl_idhash)) {
+ list_del_init(&clp->cl_idhash);
+ if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
+ rb_erase(&clp->cl_namenode, &nn->conf_name_tree);
+ else
+ rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
+ }
+ list_del_init(&clp->cl_lru);
+ spin_lock(&clp->cl_lock);
+ list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
+ list_del_init(&ses->se_hash);
+ spin_unlock(&clp->cl_lock);
+}
+
+static void
+unhash_client(struct nfs4_client *clp)
+{
+ struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
+
+ spin_lock(&nn->client_lock);
+ unhash_client_locked(clp);
+ spin_unlock(&nn->client_lock);
+}
+
+static __be32 mark_client_expired_locked(struct nfs4_client *clp)
+{
+ if (atomic_read(&clp->cl_refcount))
+ return nfserr_jukebox;
+ unhash_client_locked(clp);
+ return nfs_ok;
+}
+
+static void
+__destroy_client(struct nfs4_client *clp)
+{
+ struct nfs4_openowner *oo;
+ struct nfs4_delegation *dp;
+ struct list_head reaplist;
+
+ INIT_LIST_HEAD(&reaplist);
+ spin_lock(&state_lock);
+ while (!list_empty(&clp->cl_delegations)) {
+ dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
+ WARN_ON(!unhash_delegation_locked(dp));
+ list_add(&dp->dl_recall_lru, &reaplist);
+ }
+ spin_unlock(&state_lock);
+ while (!list_empty(&reaplist)) {
+ dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
+ list_del_init(&dp->dl_recall_lru);
+ put_clnt_odstate(dp->dl_clnt_odstate);
+ nfs4_put_deleg_lease(dp->dl_stid.sc_file);
+ nfs4_put_stid(&dp->dl_stid);
+ }
+ while (!list_empty(&clp->cl_revoked)) {
+ dp = list_entry(clp->cl_revoked.next, struct nfs4_delegation, dl_recall_lru);
+ list_del_init(&dp->dl_recall_lru);
+ nfs4_put_stid(&dp->dl_stid);
+ }
+ while (!list_empty(&clp->cl_openowners)) {
+ oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
+ nfs4_get_stateowner(&oo->oo_owner);
+ release_openowner(oo);
+ }
+ nfsd4_return_all_client_layouts(clp);
+ nfsd4_shutdown_callback(clp);
+ if (clp->cl_cb_conn.cb_xprt)
+ svc_xprt_put(clp->cl_cb_conn.cb_xprt);
+ free_client(clp);
+}
+
+static void
+destroy_client(struct nfs4_client *clp)
+{
+ unhash_client(clp);
+ __destroy_client(clp);
+}
+
+static void expire_client(struct nfs4_client *clp)
+{
+ unhash_client(clp);
+ nfsd4_client_record_remove(clp);
+ __destroy_client(clp);
+}
+
+static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
+{
+ memcpy(target->cl_verifier.data, source->data,
+ sizeof(target->cl_verifier.data));
+}
+
+static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
+{
+ target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
+ target->cl_clientid.cl_id = source->cl_clientid.cl_id;
+}
+
+static int copy_cred(struct svc_cred *target, struct svc_cred *source)
+{
+ if (source->cr_principal) {
+ target->cr_principal =
+ kstrdup(source->cr_principal, GFP_KERNEL);
+ if (target->cr_principal == NULL)
+ return -ENOMEM;
+ } else
+ target->cr_principal = NULL;
+ target->cr_flavor = source->cr_flavor;
+ target->cr_uid = source->cr_uid;
+ target->cr_gid = source->cr_gid;
+ target->cr_group_info = source->cr_group_info;
+ get_group_info(target->cr_group_info);
+ target->cr_gss_mech = source->cr_gss_mech;
+ if (source->cr_gss_mech)
+ gss_mech_get(source->cr_gss_mech);
+ return 0;
+}
+
+static int
+compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2)
+{
+ if (o1->len < o2->len)
+ return -1;
+ if (o1->len > o2->len)
+ return 1;
+ return memcmp(o1->data, o2->data, o1->len);
+}
+
+static int same_name(const char *n1, const char *n2)
+{
+ return 0 == memcmp(n1, n2, HEXDIR_LEN);
+}
+
+static int
+same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
+{
+ return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
+}
+
+static int
+same_clid(clientid_t *cl1, clientid_t *cl2)
+{
+ return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
+}
+
+static bool groups_equal(struct group_info *g1, struct group_info *g2)
+{
+ int i;
+
+ if (g1->ngroups != g2->ngroups)
+ return false;
+ for (i=0; i<g1->ngroups; i++)
+ if (!gid_eq(GROUP_AT(g1, i), GROUP_AT(g2, i)))
+ return false;
+ return true;
+}
+
+/*
+ * RFC 3530 language requires clid_inuse be returned when the
+ * "principal" associated with a requests differs from that previously
+ * used. We use uid, gid's, and gss principal string as our best
+ * approximation. We also don't want to allow non-gss use of a client
+ * established using gss: in theory cr_principal should catch that
+ * change, but in practice cr_principal can be null even in the gss case
+ * since gssd doesn't always pass down a principal string.
+ */
+static bool is_gss_cred(struct svc_cred *cr)
+{
+ /* Is cr_flavor one of the gss "pseudoflavors"?: */
+ return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR);
+}
+
+
+static bool
+same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
+{
+ if ((is_gss_cred(cr1) != is_gss_cred(cr2))
+ || (!uid_eq(cr1->cr_uid, cr2->cr_uid))
+ || (!gid_eq(cr1->cr_gid, cr2->cr_gid))
+ || !groups_equal(cr1->cr_group_info, cr2->cr_group_info))
+ return false;
+ if (cr1->cr_principal == cr2->cr_principal)
+ return true;
+ if (!cr1->cr_principal || !cr2->cr_principal)
+ return false;
+ return 0 == strcmp(cr1->cr_principal, cr2->cr_principal);
+}
+
+static bool svc_rqst_integrity_protected(struct svc_rqst *rqstp)
+{
+ struct svc_cred *cr = &rqstp->rq_cred;
+ u32 service;
+
+ if (!cr->cr_gss_mech)
+ return false;
+ service = gss_pseudoflavor_to_service(cr->cr_gss_mech, cr->cr_flavor);
+ return service == RPC_GSS_SVC_INTEGRITY ||
+ service == RPC_GSS_SVC_PRIVACY;
+}
+
+static bool mach_creds_match(struct nfs4_client *cl, struct svc_rqst *rqstp)
+{
+ struct svc_cred *cr = &rqstp->rq_cred;
+
+ if (!cl->cl_mach_cred)
+ return true;
+ if (cl->cl_cred.cr_gss_mech != cr->cr_gss_mech)
+ return false;
+ if (!svc_rqst_integrity_protected(rqstp))
+ return false;
+ if (!cr->cr_principal)
+ return false;
+ return 0 == strcmp(cl->cl_cred.cr_principal, cr->cr_principal);
+}
+
+static void gen_confirm(struct nfs4_client *clp, struct nfsd_net *nn)
+{
+ __be32 verf[2];
+
+ /*
+ * This is opaque to client, so no need to byte-swap. Use
+ * __force to keep sparse happy
+ */
+ verf[0] = (__force __be32)get_seconds();
+ verf[1] = (__force __be32)nn->clverifier_counter++;
+ memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
+}
+
+static void gen_clid(struct nfs4_client *clp, struct nfsd_net *nn)
+{
+ clp->cl_clientid.cl_boot = nn->boot_time;
+ clp->cl_clientid.cl_id = nn->clientid_counter++;
+ gen_confirm(clp, nn);
+}
+
+static struct nfs4_stid *
+find_stateid_locked(struct nfs4_client *cl, stateid_t *t)
+{
+ struct nfs4_stid *ret;
+
+ ret = idr_find(&cl->cl_stateids, t->si_opaque.so_id);
+ if (!ret || !ret->sc_type)
+ return NULL;
+ return ret;
+}
+
+static struct nfs4_stid *
+find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask)
+{
+ struct nfs4_stid *s;
+
+ spin_lock(&cl->cl_lock);
+ s = find_stateid_locked(cl, t);
+ if (s != NULL) {
+ if (typemask & s->sc_type)
+ atomic_inc(&s->sc_count);
+ else
+ s = NULL;
+ }
+ spin_unlock(&cl->cl_lock);
+ return s;
+}
+
+static struct nfs4_client *create_client(struct xdr_netobj name,
+ struct svc_rqst *rqstp, nfs4_verifier *verf)
+{
+ struct nfs4_client *clp;
+ struct sockaddr *sa = svc_addr(rqstp);
+ int ret;
+ struct net *net = SVC_NET(rqstp);
+
+ clp = alloc_client(name);
+ if (clp == NULL)
+ return NULL;
+
+ ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
+ if (ret) {
+ free_client(clp);
+ return NULL;
+ }
+ nfsd4_init_cb(&clp->cl_cb_null, clp, NULL, NFSPROC4_CLNT_CB_NULL);
+ clp->cl_time = get_seconds();
+ clear_bit(0, &clp->cl_cb_slot_busy);
+ copy_verf(clp, verf);
+ rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa);
+ clp->cl_cb_session = NULL;
+ clp->net = net;
+ return clp;
+}
+
+static void
+add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root)
+{
+ struct rb_node **new = &(root->rb_node), *parent = NULL;
+ struct nfs4_client *clp;
+
+ while (*new) {
+ clp = rb_entry(*new, struct nfs4_client, cl_namenode);
+ parent = *new;
+
+ if (compare_blob(&clp->cl_name, &new_clp->cl_name) > 0)
+ new = &((*new)->rb_left);
+ else
+ new = &((*new)->rb_right);
+ }
+
+ rb_link_node(&new_clp->cl_namenode, parent, new);
+ rb_insert_color(&new_clp->cl_namenode, root);
+}
+
+static struct nfs4_client *
+find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root)
+{
+ int cmp;
+ struct rb_node *node = root->rb_node;
+ struct nfs4_client *clp;
+
+ while (node) {
+ clp = rb_entry(node, struct nfs4_client, cl_namenode);
+ cmp = compare_blob(&clp->cl_name, name);
+ if (cmp > 0)
+ node = node->rb_left;
+ else if (cmp < 0)
+ node = node->rb_right;
+ else
+ return clp;
+ }
+ return NULL;
+}
+
+static void
+add_to_unconfirmed(struct nfs4_client *clp)
+{
+ unsigned int idhashval;
+ struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
+
+ lockdep_assert_held(&nn->client_lock);
+
+ clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
+ add_clp_to_name_tree(clp, &nn->unconf_name_tree);
+ idhashval = clientid_hashval(clp->cl_clientid.cl_id);
+ list_add(&clp->cl_idhash, &nn->unconf_id_hashtbl[idhashval]);
+ renew_client_locked(clp);
+}
+
+static void
+move_to_confirmed(struct nfs4_client *clp)
+{
+ unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
+ struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
+
+ lockdep_assert_held(&nn->client_lock);
+
+ dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
+ list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]);
+ rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
+ add_clp_to_name_tree(clp, &nn->conf_name_tree);
+ set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
+ renew_client_locked(clp);
+}
+
+static struct nfs4_client *
+find_client_in_id_table(struct list_head *tbl, clientid_t *clid, bool sessions)
+{
+ struct nfs4_client *clp;
+ unsigned int idhashval = clientid_hashval(clid->cl_id);
+
+ list_for_each_entry(clp, &tbl[idhashval], cl_idhash) {
+ if (same_clid(&clp->cl_clientid, clid)) {
+ if ((bool)clp->cl_minorversion != sessions)
+ return NULL;
+ renew_client_locked(clp);
+ return clp;
+ }
+ }
+ return NULL;
+}
+
+static struct nfs4_client *
+find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
+{
+ struct list_head *tbl = nn->conf_id_hashtbl;
+
+ lockdep_assert_held(&nn->client_lock);
+ return find_client_in_id_table(tbl, clid, sessions);
+}
+
+static struct nfs4_client *
+find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
+{
+ struct list_head *tbl = nn->unconf_id_hashtbl;
+
+ lockdep_assert_held(&nn->client_lock);
+ return find_client_in_id_table(tbl, clid, sessions);
+}
+
+static bool clp_used_exchangeid(struct nfs4_client *clp)
+{
+ return clp->cl_exchange_flags != 0;
+}
+
+static struct nfs4_client *
+find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
+{
+ lockdep_assert_held(&nn->client_lock);
+ return find_clp_in_name_tree(name, &nn->conf_name_tree);
+}
+
+static struct nfs4_client *
+find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
+{
+ lockdep_assert_held(&nn->client_lock);
+ return find_clp_in_name_tree(name, &nn->unconf_name_tree);
+}
+
+static void
+gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
+{
+ struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
+ struct sockaddr *sa = svc_addr(rqstp);
+ u32 scopeid = rpc_get_scope_id(sa);
+ unsigned short expected_family;
+
+ /* Currently, we only support tcp and tcp6 for the callback channel */
+ if (se->se_callback_netid_len == 3 &&
+ !memcmp(se->se_callback_netid_val, "tcp", 3))
+ expected_family = AF_INET;
+ else if (se->se_callback_netid_len == 4 &&
+ !memcmp(se->se_callback_netid_val, "tcp6", 4))
+ expected_family = AF_INET6;
+ else
+ goto out_err;
+
+ conn->cb_addrlen = rpc_uaddr2sockaddr(clp->net, se->se_callback_addr_val,
+ se->se_callback_addr_len,
+ (struct sockaddr *)&conn->cb_addr,
+ sizeof(conn->cb_addr));
+
+ if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
+ goto out_err;
+
+ if (conn->cb_addr.ss_family == AF_INET6)
+ ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
+
+ conn->cb_prog = se->se_callback_prog;
+ conn->cb_ident = se->se_callback_ident;
+ memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
+ return;
+out_err:
+ conn->cb_addr.ss_family = AF_UNSPEC;
+ conn->cb_addrlen = 0;
+ dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
+ "will not receive delegations\n",
+ clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
+
+ return;
+}
+
+/*
+ * Cache a reply. nfsd4_check_resp_size() has bounded the cache size.
+ */
+static void
+nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
+{
+ struct xdr_buf *buf = resp->xdr.buf;
+ struct nfsd4_slot *slot = resp->cstate.slot;
+ unsigned int base;
+
+ dprintk("--> %s slot %p\n", __func__, slot);
+
+ slot->sl_opcnt = resp->opcnt;
+ slot->sl_status = resp->cstate.status;
+
+ slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
+ if (nfsd4_not_cached(resp)) {
+ slot->sl_datalen = 0;
+ return;
+ }
+ base = resp->cstate.data_offset;
+ slot->sl_datalen = buf->len - base;
+ if (read_bytes_from_xdr_buf(buf, base, slot->sl_data, slot->sl_datalen))
+ WARN("%s: sessions DRC could not cache compound\n", __func__);
+ return;
+}
+
+/*
+ * Encode the replay sequence operation from the slot values.
+ * If cachethis is FALSE encode the uncached rep error on the next
+ * operation which sets resp->p and increments resp->opcnt for
+ * nfs4svc_encode_compoundres.
+ *
+ */
+static __be32
+nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
+ struct nfsd4_compoundres *resp)
+{
+ struct nfsd4_op *op;
+ struct nfsd4_slot *slot = resp->cstate.slot;
+
+ /* Encode the replayed sequence operation */
+ op = &args->ops[resp->opcnt - 1];
+ nfsd4_encode_operation(resp, op);
+
+ /* Return nfserr_retry_uncached_rep in next operation. */
+ if (args->opcnt > 1 && !(slot->sl_flags & NFSD4_SLOT_CACHETHIS)) {
+ op = &args->ops[resp->opcnt++];
+ op->status = nfserr_retry_uncached_rep;
+ nfsd4_encode_operation(resp, op);
+ }
+ return op->status;
+}
+
+/*
+ * The sequence operation is not cached because we can use the slot and
+ * session values.
+ */
+static __be32
+nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
+ struct nfsd4_sequence *seq)
+{
+ struct nfsd4_slot *slot = resp->cstate.slot;
+ struct xdr_stream *xdr = &resp->xdr;
+ __be32 *p;
+ __be32 status;
+
+ dprintk("--> %s slot %p\n", __func__, slot);
+
+ status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
+ if (status)
+ return status;
+
+ p = xdr_reserve_space(xdr, slot->sl_datalen);
+ if (!p) {
+ WARN_ON_ONCE(1);
+ return nfserr_serverfault;
+ }
+ xdr_encode_opaque_fixed(p, slot->sl_data, slot->sl_datalen);
+ xdr_commit_encode(xdr);
+
+ resp->opcnt = slot->sl_opcnt;
+ return slot->sl_status;
+}
+
+/*
+ * Set the exchange_id flags returned by the server.
+ */
+static void
+nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
+{
+#ifdef CONFIG_NFSD_PNFS
+ new->cl_exchange_flags |= EXCHGID4_FLAG_USE_PNFS_MDS;
+#else
+ new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
+#endif
+
+ /* Referrals are supported, Migration is not. */
+ new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
+
+ /* set the wire flags to return to client. */
+ clid->flags = new->cl_exchange_flags;
+}
+
+static bool client_has_openowners(struct nfs4_client *clp)
+{
+ struct nfs4_openowner *oo;
+
+ list_for_each_entry(oo, &clp->cl_openowners, oo_perclient) {
+ if (!list_empty(&oo->oo_owner.so_stateids))
+ return true;
+ }
+ return false;
+}
+
+static bool client_has_state(struct nfs4_client *clp)
+{
+ return client_has_openowners(clp)
+#ifdef CONFIG_NFSD_PNFS
+ || !list_empty(&clp->cl_lo_states)
+#endif
+ || !list_empty(&clp->cl_delegations)
+ || !list_empty(&clp->cl_sessions);
+}
+
+__be32
+nfsd4_exchange_id(struct svc_rqst *rqstp,
+ struct nfsd4_compound_state *cstate,
+ struct nfsd4_exchange_id *exid)
+{
+ struct nfs4_client *conf, *new;
+ struct nfs4_client *unconf = NULL;
+ __be32 status;
+ char addr_str[INET6_ADDRSTRLEN];
+ nfs4_verifier verf = exid->verifier;
+ struct sockaddr *sa = svc_addr(rqstp);
+ bool update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A;
+ struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
+
+ rpc_ntop(sa, addr_str, sizeof(addr_str));
+ dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
+ "ip_addr=%s flags %x, spa_how %d\n",
+ __func__, rqstp, exid, exid->clname.len, exid->clname.data,
+ addr_str, exid->flags, exid->spa_how);
+
+ if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
+ return nfserr_inval;
+
+ switch (exid->spa_how) {
+ case SP4_MACH_CRED:
+ if (!svc_rqst_integrity_protected(rqstp))
+ return nfserr_inval;
+ case SP4_NONE:
+ break;
+ default: /* checked by xdr code */
+ WARN_ON_ONCE(1);
+ case SP4_SSV:
+ return nfserr_encr_alg_unsupp;
+ }
+
+ new = create_client(exid->clname, rqstp, &verf);
+ if (new == NULL)
+ return nfserr_jukebox;
+
+ /* Cases below refer to rfc 5661 section 18.35.4: */
+ spin_lock(&nn->client_lock);
+ conf = find_confirmed_client_by_name(&exid->clname, nn);
+ if (conf) {
+ bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred);
+ bool verfs_match = same_verf(&verf, &conf->cl_verifier);
+
+ if (update) {
+ if (!clp_used_exchangeid(conf)) { /* buggy client */
+ status = nfserr_inval;
+ goto out;
+ }
+ if (!mach_creds_match(conf, rqstp)) {
+ status = nfserr_wrong_cred;
+ goto out;
+ }
+ if (!creds_match) { /* case 9 */
+ status = nfserr_perm;
+ goto out;
+ }
+ if (!verfs_match) { /* case 8 */
+ status = nfserr_not_same;
+ goto out;
+ }
+ /* case 6 */
+ exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
+ goto out_copy;
+ }
+ if (!creds_match) { /* case 3 */
+ if (client_has_state(conf)) {
+ status = nfserr_clid_inuse;
+ goto out;
+ }
+ goto out_new;
+ }
+ if (verfs_match) { /* case 2 */
+ conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
+ goto out_copy;
+ }
+ /* case 5, client reboot */
+ conf = NULL;
+ goto out_new;
+ }
+
+ if (update) { /* case 7 */
+ status = nfserr_noent;
+ goto out;
+ }
+
+ unconf = find_unconfirmed_client_by_name(&exid->clname, nn);
+ if (unconf) /* case 4, possible retry or client restart */
+ unhash_client_locked(unconf);
+
+ /* case 1 (normal case) */
+out_new:
+ if (conf) {
+ status = mark_client_expired_locked(conf);
+ if (status)
+ goto out;
+ }
+ new->cl_minorversion = cstate->minorversion;
+ new->cl_mach_cred = (exid->spa_how == SP4_MACH_CRED);
+
+ gen_clid(new, nn);
+ add_to_unconfirmed(new);
+ swap(new, conf);
+out_copy:
+ exid->clientid.cl_boot = conf->cl_clientid.cl_boot;
+ exid->clientid.cl_id = conf->cl_clientid.cl_id;
+
+ exid->seqid = conf->cl_cs_slot.sl_seqid + 1;
+ nfsd4_set_ex_flags(conf, exid);
+
+ dprintk("nfsd4_exchange_id seqid %d flags %x\n",
+ conf->cl_cs_slot.sl_seqid, conf->cl_exchange_flags);
+ status = nfs_ok;
+
+out:
+ spin_unlock(&nn->client_lock);
+ if (new)
+ expire_client(new);
+ if (unconf)
+ expire_client(unconf);
+ return status;
+}
+
+static __be32
+check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
+{
+ dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
+ slot_seqid);
+
+ /* The slot is in use, and no response has been sent. */
+ if (slot_inuse) {
+ if (seqid == slot_seqid)
+ return nfserr_jukebox;
+ else
+ return nfserr_seq_misordered;
+ }
+ /* Note unsigned 32-bit arithmetic handles wraparound: */
+ if (likely(seqid == slot_seqid + 1))
+ return nfs_ok;
+ if (seqid == slot_seqid)
+ return nfserr_replay_cache;
+ return nfserr_seq_misordered;
+}
+
+/*
+ * Cache the create session result into the create session single DRC
+ * slot cache by saving the xdr structure. sl_seqid has been set.
+ * Do this for solo or embedded create session operations.
+ */
+static void
+nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
+ struct nfsd4_clid_slot *slot, __be32 nfserr)
+{
+ slot->sl_status = nfserr;
+ memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
+}
+
+static __be32
+nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
+ struct nfsd4_clid_slot *slot)
+{
+ memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
+ return slot->sl_status;
+}
+
+#define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
+ 2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
+ 1 + /* MIN tag is length with zero, only length */ \
+ 3 + /* version, opcount, opcode */ \
+ XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
+ /* seqid, slotID, slotID, cache */ \
+ 4 ) * sizeof(__be32))
+
+#define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
+ 2 + /* verifier: AUTH_NULL, length 0 */\
+ 1 + /* status */ \
+ 1 + /* MIN tag is length with zero, only length */ \
+ 3 + /* opcount, opcode, opstatus*/ \
+ XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
+ /* seqid, slotID, slotID, slotID, status */ \
+ 5 ) * sizeof(__be32))
+
+static __be32 check_forechannel_attrs(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
+{
+ u32 maxrpc = nn->nfsd_serv->sv_max_mesg;
+
+ if (ca->maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ)
+ return nfserr_toosmall;
+ if (ca->maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ)
+ return nfserr_toosmall;
+ ca->headerpadsz = 0;
+ ca->maxreq_sz = min_t(u32, ca->maxreq_sz, maxrpc);
+ ca->maxresp_sz = min_t(u32, ca->maxresp_sz, maxrpc);
+ ca->maxops = min_t(u32, ca->maxops, NFSD_MAX_OPS_PER_COMPOUND);
+ ca->maxresp_cached = min_t(u32, ca->maxresp_cached,
+ NFSD_SLOT_CACHE_SIZE + NFSD_MIN_HDR_SEQ_SZ);
+ ca->maxreqs = min_t(u32, ca->maxreqs, NFSD_MAX_SLOTS_PER_SESSION);
+ /*
+ * Note decreasing slot size below client's request may make it
+ * difficult for client to function correctly, whereas
+ * decreasing the number of slots will (just?) affect
+ * performance. When short on memory we therefore prefer to
+ * decrease number of slots instead of their size. Clients that
+ * request larger slots than they need will get poor results:
+ */
+ ca->maxreqs = nfsd4_get_drc_mem(ca);
+ if (!ca->maxreqs)
+ return nfserr_jukebox;
+
+ return nfs_ok;
+}
+
+#define NFSD_CB_MAX_REQ_SZ ((NFS4_enc_cb_recall_sz + \
+ RPC_MAX_HEADER_WITH_AUTH) * sizeof(__be32))
+#define NFSD_CB_MAX_RESP_SZ ((NFS4_dec_cb_recall_sz + \
+ RPC_MAX_REPHEADER_WITH_AUTH) * sizeof(__be32))
+
+static __be32 check_backchannel_attrs(struct nfsd4_channel_attrs *ca)
+{
+ ca->headerpadsz = 0;
+
+ /*
+ * These RPC_MAX_HEADER macros are overkill, especially since we
+ * don't even do gss on the backchannel yet. But this is still
+ * less than 1k. Tighten up this estimate in the unlikely event
+ * it turns out to be a problem for some client:
+ */
+ if (ca->maxreq_sz < NFSD_CB_MAX_REQ_SZ)
+ return nfserr_toosmall;
+ if (ca->maxresp_sz < NFSD_CB_MAX_RESP_SZ)
+ return nfserr_toosmall;
+ ca->maxresp_cached = 0;
+ if (ca->maxops < 2)
+ return nfserr_toosmall;
+
+ return nfs_ok;
+}
+
+static __be32 nfsd4_check_cb_sec(struct nfsd4_cb_sec *cbs)
+{
+ switch (cbs->flavor) {
+ case RPC_AUTH_NULL:
+ case RPC_AUTH_UNIX:
+ return nfs_ok;
+ default:
+ /*
+ * GSS case: the spec doesn't allow us to return this
+ * error. But it also doesn't allow us not to support
+ * GSS.
+ * I'd rather this fail hard than return some error the
+ * client might think it can already handle:
+ */
+ return nfserr_encr_alg_unsupp;
+ }
+}
+
+__be32
+nfsd4_create_session(struct svc_rqst *rqstp,
+ struct nfsd4_compound_state *cstate,
+ struct nfsd4_create_session *cr_ses)
+{
+ struct sockaddr *sa = svc_addr(rqstp);
+ struct nfs4_client *conf, *unconf;
+ struct nfs4_client *old = NULL;
+ struct nfsd4_session *new;
+ struct nfsd4_conn *conn;
+ struct nfsd4_clid_slot *cs_slot = NULL;
+ __be32 status = 0;
+ struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
+
+ if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
+ return nfserr_inval;
+ status = nfsd4_check_cb_sec(&cr_ses->cb_sec);
+ if (status)
+ return status;
+ status = check_forechannel_attrs(&cr_ses->fore_channel, nn);
+ if (status)
+ return status;
+ status = check_backchannel_attrs(&cr_ses->back_channel);
+ if (status)
+ goto out_release_drc_mem;
+ status = nfserr_jukebox;
+ new = alloc_session(&cr_ses->fore_channel, &cr_ses->back_channel);
+ if (!new)
+ goto out_release_drc_mem;
+ conn = alloc_conn_from_crses(rqstp, cr_ses);
+ if (!conn)
+ goto out_free_session;
+
+ spin_lock(&nn->client_lock);
+ unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn);
+ conf = find_confirmed_client(&cr_ses->clientid, true, nn);
+ WARN_ON_ONCE(conf && unconf);
+
+ if (conf) {
+ status = nfserr_wrong_cred;
+ if (!mach_creds_match(conf, rqstp))
+ goto out_free_conn;
+ cs_slot = &conf->cl_cs_slot;
+ status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
+ if (status) {
+ if (status == nfserr_replay_cache)
+ status = nfsd4_replay_create_session(cr_ses, cs_slot);
+ goto out_free_conn;
+ }
+ } else if (unconf) {
+ if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
+ !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
+ status = nfserr_clid_inuse;
+ goto out_free_conn;
+ }
+ status = nfserr_wrong_cred;
+ if (!mach_creds_match(unconf, rqstp))
+ goto out_free_conn;
+ cs_slot = &unconf->cl_cs_slot;
+ status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
+ if (status) {
+ /* an unconfirmed replay returns misordered */
+ status = nfserr_seq_misordered;
+ goto out_free_conn;
+ }
+ old = find_confirmed_client_by_name(&unconf->cl_name, nn);
+ if (old) {
+ status = mark_client_expired_locked(old);
+ if (status) {
+ old = NULL;
+ goto out_free_conn;
+ }
+ }
+ move_to_confirmed(unconf);
+ conf = unconf;
+ } else {
+ status = nfserr_stale_clientid;
+ goto out_free_conn;
+ }
+ status = nfs_ok;
+ /*
+ * We do not support RDMA or persistent sessions
+ */
+ cr_ses->flags &= ~SESSION4_PERSIST;
+ cr_ses->flags &= ~SESSION4_RDMA;
+
+ init_session(rqstp, new, conf, cr_ses);
+ nfsd4_get_session_locked(new);
+
+ memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
+ NFS4_MAX_SESSIONID_LEN);
+ cs_slot->sl_seqid++;
+ cr_ses->seqid = cs_slot->sl_seqid;
+
+ /* cache solo and embedded create sessions under the client_lock */
+ nfsd4_cache_create_session(cr_ses, cs_slot, status);
+ spin_unlock(&nn->client_lock);
+ /* init connection and backchannel */
+ nfsd4_init_conn(rqstp, conn, new);
+ nfsd4_put_session(new);
+ if (old)
+ expire_client(old);
+ return status;
+out_free_conn:
+ spin_unlock(&nn->client_lock);
+ free_conn(conn);
+ if (old)
+ expire_client(old);
+out_free_session:
+ __free_session(new);
+out_release_drc_mem:
+ nfsd4_put_drc_mem(&cr_ses->fore_channel);
+ return status;
+}
+
+static __be32 nfsd4_map_bcts_dir(u32 *dir)
+{
+ switch (*dir) {
+ case NFS4_CDFC4_FORE:
+ case NFS4_CDFC4_BACK:
+ return nfs_ok;
+ case NFS4_CDFC4_FORE_OR_BOTH:
+ case NFS4_CDFC4_BACK_OR_BOTH:
+ *dir = NFS4_CDFC4_BOTH;
+ return nfs_ok;
+ };
+ return nfserr_inval;
+}
+
+__be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_backchannel_ctl *bc)
+{
+ struct nfsd4_session *session = cstate->session;
+ struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
+ __be32 status;
+
+ status = nfsd4_check_cb_sec(&bc->bc_cb_sec);
+ if (status)
+ return status;
+ spin_lock(&nn->client_lock);
+ session->se_cb_prog = bc->bc_cb_program;
+ session->se_cb_sec = bc->bc_cb_sec;
+ spin_unlock(&nn->client_lock);
+
+ nfsd4_probe_callback(session->se_client);
+
+ return nfs_ok;
+}
+
+__be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
+ struct nfsd4_compound_state *cstate,
+ struct nfsd4_bind_conn_to_session *bcts)
+{
+ __be32 status;
+ struct nfsd4_conn *conn;
+ struct nfsd4_session *session;
+ struct net *net = SVC_NET(rqstp);
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+
+ if (!nfsd4_last_compound_op(rqstp))
+ return nfserr_not_only_op;
+ spin_lock(&nn->client_lock);
+ session = find_in_sessionid_hashtbl(&bcts->sessionid, net, &status);
+ spin_unlock(&nn->client_lock);
+ if (!session)
+ goto out_no_session;
+ status = nfserr_wrong_cred;
+ if (!mach_creds_match(session->se_client, rqstp))
+ goto out;
+ status = nfsd4_map_bcts_dir(&bcts->dir);
+ if (status)
+ goto out;
+ conn = alloc_conn(rqstp, bcts->dir);
+ status = nfserr_jukebox;
+ if (!conn)
+ goto out;
+ nfsd4_init_conn(rqstp, conn, session);
+ status = nfs_ok;
+out:
+ nfsd4_put_session(session);
+out_no_session:
+ return status;
+}
+
+static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid)
+{
+ if (!session)
+ return 0;
+ return !memcmp(sid, &session->se_sessionid, sizeof(*sid));
+}
+
+__be32
+nfsd4_destroy_session(struct svc_rqst *r,
+ struct nfsd4_compound_state *cstate,
+ struct nfsd4_destroy_session *sessionid)
+{
+ struct nfsd4_session *ses;
+ __be32 status;
+ int ref_held_by_me = 0;
+ struct net *net = SVC_NET(r);
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+
+ status = nfserr_not_only_op;
+ if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) {
+ if (!nfsd4_last_compound_op(r))
+ goto out;
+ ref_held_by_me++;
+ }
+ dump_sessionid(__func__, &sessionid->sessionid);
+ spin_lock(&nn->client_lock);
+ ses = find_in_sessionid_hashtbl(&sessionid->sessionid, net, &status);
+ if (!ses)
+ goto out_client_lock;
+ status = nfserr_wrong_cred;
+ if (!mach_creds_match(ses->se_client, r))
+ goto out_put_session;
+ status = mark_session_dead_locked(ses, 1 + ref_held_by_me);
+ if (status)
+ goto out_put_session;
+ unhash_session(ses);
+ spin_unlock(&nn->client_lock);
+
+ nfsd4_probe_callback_sync(ses->se_client);
+
+ spin_lock(&nn->client_lock);
+ status = nfs_ok;
+out_put_session:
+ nfsd4_put_session_locked(ses);
+out_client_lock:
+ spin_unlock(&nn->client_lock);
+out:
+ return status;
+}
+
+static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
+{
+ struct nfsd4_conn *c;
+
+ list_for_each_entry(c, &s->se_conns, cn_persession) {
+ if (c->cn_xprt == xpt) {
+ return c;
+ }
+ }
+ return NULL;
+}
+
+static __be32 nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
+{
+ struct nfs4_client *clp = ses->se_client;
+ struct nfsd4_conn *c;
+ __be32 status = nfs_ok;
+ int ret;
+
+ spin_lock(&clp->cl_lock);
+ c = __nfsd4_find_conn(new->cn_xprt, ses);
+ if (c)
+ goto out_free;
+ status = nfserr_conn_not_bound_to_session;
+ if (clp->cl_mach_cred)
+ goto out_free;
+ __nfsd4_hash_conn(new, ses);
+ spin_unlock(&clp->cl_lock);
+ ret = nfsd4_register_conn(new);
+ if (ret)
+ /* oops; xprt is already down: */
+ nfsd4_conn_lost(&new->cn_xpt_user);
+ return nfs_ok;
+out_free:
+ spin_unlock(&clp->cl_lock);
+ free_conn(new);
+ return status;
+}
+
+static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
+{
+ struct nfsd4_compoundargs *args = rqstp->rq_argp;
+
+ return args->opcnt > session->se_fchannel.maxops;
+}
+
+static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
+ struct nfsd4_session *session)
+{
+ struct xdr_buf *xb = &rqstp->rq_arg;
+
+ return xb->len > session->se_fchannel.maxreq_sz;
+}
+
+__be32
+nfsd4_sequence(struct svc_rqst *rqstp,
+ struct nfsd4_compound_state *cstate,
+ struct nfsd4_sequence *seq)
+{
+ struct nfsd4_compoundres *resp = rqstp->rq_resp;
+ struct xdr_stream *xdr = &resp->xdr;
+ struct nfsd4_session *session;
+ struct nfs4_client *clp;
+ struct nfsd4_slot *slot;
+ struct nfsd4_conn *conn;
+ __be32 status;
+ int buflen;
+ struct net *net = SVC_NET(rqstp);
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+
+ if (resp->opcnt != 1)
+ return nfserr_sequence_pos;
+
+ /*
+ * Will be either used or freed by nfsd4_sequence_check_conn
+ * below.
+ */
+ conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
+ if (!conn)
+ return nfserr_jukebox;
+
+ spin_lock(&nn->client_lock);
+ session = find_in_sessionid_hashtbl(&seq->sessionid, net, &status);
+ if (!session)
+ goto out_no_session;
+ clp = session->se_client;
+
+ status = nfserr_too_many_ops;
+ if (nfsd4_session_too_many_ops(rqstp, session))
+ goto out_put_session;
+
+ status = nfserr_req_too_big;
+ if (nfsd4_request_too_big(rqstp, session))
+ goto out_put_session;
+
+ status = nfserr_badslot;
+ if (seq->slotid >= session->se_fchannel.maxreqs)
+ goto out_put_session;
+
+ slot = session->se_slots[seq->slotid];
+ dprintk("%s: slotid %d\n", __func__, seq->slotid);
+
+ /* We do not negotiate the number of slots yet, so set the
+ * maxslots to the session maxreqs which is used to encode
+ * sr_highest_slotid and the sr_target_slot id to maxslots */
+ seq->maxslots = session->se_fchannel.maxreqs;
+
+ status = check_slot_seqid(seq->seqid, slot->sl_seqid,
+ slot->sl_flags & NFSD4_SLOT_INUSE);
+ if (status == nfserr_replay_cache) {
+ status = nfserr_seq_misordered;
+ if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
+ goto out_put_session;
+ cstate->slot = slot;
+ cstate->session = session;
+ cstate->clp = clp;
+ /* Return the cached reply status and set cstate->status
+ * for nfsd4_proc_compound processing */
+ status = nfsd4_replay_cache_entry(resp, seq);
+ cstate->status = nfserr_replay_cache;
+ goto out;
+ }
+ if (status)
+ goto out_put_session;
+
+ status = nfsd4_sequence_check_conn(conn, session);
+ conn = NULL;
+ if (status)
+ goto out_put_session;
+
+ buflen = (seq->cachethis) ?
+ session->se_fchannel.maxresp_cached :
+ session->se_fchannel.maxresp_sz;
+ status = (seq->cachethis) ? nfserr_rep_too_big_to_cache :
+ nfserr_rep_too_big;
+ if (xdr_restrict_buflen(xdr, buflen - rqstp->rq_auth_slack))
+ goto out_put_session;
+ svc_reserve(rqstp, buflen);
+
+ status = nfs_ok;
+ /* Success! bump slot seqid */
+ slot->sl_seqid = seq->seqid;
+ slot->sl_flags |= NFSD4_SLOT_INUSE;
+ if (seq->cachethis)
+ slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
+ else
+ slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
+
+ cstate->slot = slot;
+ cstate->session = session;
+ cstate->clp = clp;
+
+out:
+ switch (clp->cl_cb_state) {
+ case NFSD4_CB_DOWN:
+ seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
+ break;
+ case NFSD4_CB_FAULT:
+ seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
+ break;
+ default:
+ seq->status_flags = 0;
+ }
+ if (!list_empty(&clp->cl_revoked))
+ seq->status_flags |= SEQ4_STATUS_RECALLABLE_STATE_REVOKED;
+out_no_session:
+ if (conn)
+ free_conn(conn);
+ spin_unlock(&nn->client_lock);
+ return status;
+out_put_session:
+ nfsd4_put_session_locked(session);
+ goto out_no_session;
+}
+
+void
+nfsd4_sequence_done(struct nfsd4_compoundres *resp)
+{
+ struct nfsd4_compound_state *cs = &resp->cstate;
+
+ if (nfsd4_has_session(cs)) {
+ if (cs->status != nfserr_replay_cache) {
+ nfsd4_store_cache_entry(resp);
+ cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
+ }
+ /* Drop session reference that was taken in nfsd4_sequence() */
+ nfsd4_put_session(cs->session);
+ } else if (cs->clp)
+ put_client_renew(cs->clp);
+}
+
+__be32
+nfsd4_destroy_clientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_destroy_clientid *dc)
+{
+ struct nfs4_client *conf, *unconf;
+ struct nfs4_client *clp = NULL;
+ __be32 status = 0;
+ struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
+
+ spin_lock(&nn->client_lock);
+ unconf = find_unconfirmed_client(&dc->clientid, true, nn);
+ conf = find_confirmed_client(&dc->clientid, true, nn);
+ WARN_ON_ONCE(conf && unconf);
+
+ if (conf) {
+ if (client_has_state(conf)) {
+ status = nfserr_clientid_busy;
+ goto out;
+ }
+ status = mark_client_expired_locked(conf);
+ if (status)
+ goto out;
+ clp = conf;
+ } else if (unconf)
+ clp = unconf;
+ else {
+ status = nfserr_stale_clientid;
+ goto out;
+ }
+ if (!mach_creds_match(clp, rqstp)) {
+ clp = NULL;
+ status = nfserr_wrong_cred;
+ goto out;
+ }
+ unhash_client_locked(clp);
+out:
+ spin_unlock(&nn->client_lock);
+ if (clp)
+ expire_client(clp);
+ return status;
+}
+
+__be32
+nfsd4_reclaim_complete(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_reclaim_complete *rc)
+{
+ __be32 status = 0;
+
+ if (rc->rca_one_fs) {
+ if (!cstate->current_fh.fh_dentry)
+ return nfserr_nofilehandle;
+ /*
+ * We don't take advantage of the rca_one_fs case.
+ * That's OK, it's optional, we can safely ignore it.
+ */
+ return nfs_ok;
+ }
+
+ status = nfserr_complete_already;
+ if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
+ &cstate->session->se_client->cl_flags))
+ goto out;
+
+ status = nfserr_stale_clientid;
+ if (is_client_expired(cstate->session->se_client))
+ /*
+ * The following error isn't really legal.
+ * But we only get here if the client just explicitly
+ * destroyed the client. Surely it no longer cares what
+ * error it gets back on an operation for the dead
+ * client.
+ */
+ goto out;
+
+ status = nfs_ok;
+ nfsd4_client_record_create(cstate->session->se_client);
+out:
+ return status;
+}
+
+__be32
+nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
+ struct nfsd4_setclientid *setclid)
+{
+ struct xdr_netobj clname = setclid->se_name;
+ nfs4_verifier clverifier = setclid->se_verf;
+ struct nfs4_client *conf, *new;
+ struct nfs4_client *unconf = NULL;
+ __be32 status;
+ struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
+
+ new = create_client(clname, rqstp, &clverifier);
+ if (new == NULL)
+ return nfserr_jukebox;
+ /* Cases below refer to rfc 3530 section 14.2.33: */
+ spin_lock(&nn->client_lock);
+ conf = find_confirmed_client_by_name(&clname, nn);
+ if (conf && client_has_state(conf)) {
+ /* case 0: */
+ status = nfserr_clid_inuse;
+ if (clp_used_exchangeid(conf))
+ goto out;
+ if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
+ char addr_str[INET6_ADDRSTRLEN];
+ rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
+ sizeof(addr_str));
+ dprintk("NFSD: setclientid: string in use by client "
+ "at %s\n", addr_str);
+ goto out;
+ }
+ }
+ unconf = find_unconfirmed_client_by_name(&clname, nn);
+ if (unconf)
+ unhash_client_locked(unconf);
+ if (conf && same_verf(&conf->cl_verifier, &clverifier)) {
+ /* case 1: probable callback update */
+ copy_clid(new, conf);
+ gen_confirm(new, nn);
+ } else /* case 4 (new client) or cases 2, 3 (client reboot): */
+ gen_clid(new, nn);
+ new->cl_minorversion = 0;
+ gen_callback(new, setclid, rqstp);
+ add_to_unconfirmed(new);
+ setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
+ setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
+ memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
+ new = NULL;
+ status = nfs_ok;
+out:
+ spin_unlock(&nn->client_lock);
+ if (new)
+ free_client(new);
+ if (unconf)
+ expire_client(unconf);
+ return status;
+}
+
+
+__be32
+nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
+ struct nfsd4_compound_state *cstate,
+ struct nfsd4_setclientid_confirm *setclientid_confirm)
+{
+ struct nfs4_client *conf, *unconf;
+ struct nfs4_client *old = NULL;
+ nfs4_verifier confirm = setclientid_confirm->sc_confirm;
+ clientid_t * clid = &setclientid_confirm->sc_clientid;
+ __be32 status;
+ struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
+
+ if (STALE_CLIENTID(clid, nn))
+ return nfserr_stale_clientid;
+
+ spin_lock(&nn->client_lock);
+ conf = find_confirmed_client(clid, false, nn);
+ unconf = find_unconfirmed_client(clid, false, nn);
+ /*
+ * We try hard to give out unique clientid's, so if we get an
+ * attempt to confirm the same clientid with a different cred,
+ * the client may be buggy; this should never happen.
+ *
+ * Nevertheless, RFC 7530 recommends INUSE for this case:
+ */
+ status = nfserr_clid_inuse;
+ if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred))
+ goto out;
+ if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred))
+ goto out;
+ /* cases below refer to rfc 3530 section 14.2.34: */
+ if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
+ if (conf && !unconf) /* case 2: probable retransmit */
+ status = nfs_ok;
+ else /* case 4: client hasn't noticed we rebooted yet? */
+ status = nfserr_stale_clientid;
+ goto out;
+ }
+ status = nfs_ok;
+ if (conf) { /* case 1: callback update */
+ old = unconf;
+ unhash_client_locked(old);
+ nfsd4_change_callback(conf, &unconf->cl_cb_conn);
+ } else { /* case 3: normal case; new or rebooted client */
+ old = find_confirmed_client_by_name(&unconf->cl_name, nn);
+ if (old) {
+ status = nfserr_clid_inuse;
+ if (client_has_state(old)
+ && !same_creds(&unconf->cl_cred,
+ &old->cl_cred))
+ goto out;
+ status = mark_client_expired_locked(old);
+ if (status) {
+ old = NULL;
+ goto out;
+ }
+ }
+ move_to_confirmed(unconf);
+ conf = unconf;
+ }
+ get_client_locked(conf);
+ spin_unlock(&nn->client_lock);
+ nfsd4_probe_callback(conf);
+ spin_lock(&nn->client_lock);
+ put_client_renew_locked(conf);
+out:
+ spin_unlock(&nn->client_lock);
+ if (old)
+ expire_client(old);
+ return status;
+}
+
+static struct nfs4_file *nfsd4_alloc_file(void)
+{
+ return kmem_cache_alloc(file_slab, GFP_KERNEL);
+}
+
+/* OPEN Share state helper functions */
+static void nfsd4_init_file(struct knfsd_fh *fh, unsigned int hashval,
+ struct nfs4_file *fp)
+{
+ lockdep_assert_held(&state_lock);
+
+ atomic_set(&fp->fi_ref, 1);
+ spin_lock_init(&fp->fi_lock);
+ INIT_LIST_HEAD(&fp->fi_stateids);
+ INIT_LIST_HEAD(&fp->fi_delegations);
+ INIT_LIST_HEAD(&fp->fi_clnt_odstate);
+ fh_copy_shallow(&fp->fi_fhandle, fh);
+ fp->fi_deleg_file = NULL;
+ fp->fi_had_conflict = false;
+ fp->fi_share_deny = 0;
+ memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
+ memset(fp->fi_access, 0, sizeof(fp->fi_access));
+#ifdef CONFIG_NFSD_PNFS
+ INIT_LIST_HEAD(&fp->fi_lo_states);
+ atomic_set(&fp->fi_lo_recalls, 0);
+#endif
+ hlist_add_head_rcu(&fp->fi_hash, &file_hashtbl[hashval]);
+}
+
+void
+nfsd4_free_slabs(void)
+{
+ kmem_cache_destroy(odstate_slab);
+ kmem_cache_destroy(openowner_slab);
+ kmem_cache_destroy(lockowner_slab);
+ kmem_cache_destroy(file_slab);
+ kmem_cache_destroy(stateid_slab);
+ kmem_cache_destroy(deleg_slab);
+}
+
+int
+nfsd4_init_slabs(void)
+{
+ openowner_slab = kmem_cache_create("nfsd4_openowners",
+ sizeof(struct nfs4_openowner), 0, 0, NULL);
+ if (openowner_slab == NULL)
+ goto out;
+ lockowner_slab = kmem_cache_create("nfsd4_lockowners",
+ sizeof(struct nfs4_lockowner), 0, 0, NULL);
+ if (lockowner_slab == NULL)
+ goto out_free_openowner_slab;
+ file_slab = kmem_cache_create("nfsd4_files",
+ sizeof(struct nfs4_file), 0, 0, NULL);
+ if (file_slab == NULL)
+ goto out_free_lockowner_slab;
+ stateid_slab = kmem_cache_create("nfsd4_stateids",
+ sizeof(struct nfs4_ol_stateid), 0, 0, NULL);
+ if (stateid_slab == NULL)
+ goto out_free_file_slab;
+ deleg_slab = kmem_cache_create("nfsd4_delegations",
+ sizeof(struct nfs4_delegation), 0, 0, NULL);
+ if (deleg_slab == NULL)
+ goto out_free_stateid_slab;
+ odstate_slab = kmem_cache_create("nfsd4_odstate",
+ sizeof(struct nfs4_clnt_odstate), 0, 0, NULL);
+ if (odstate_slab == NULL)
+ goto out_free_deleg_slab;
+ return 0;
+
+out_free_deleg_slab:
+ kmem_cache_destroy(deleg_slab);
+out_free_stateid_slab:
+ kmem_cache_destroy(stateid_slab);
+out_free_file_slab:
+ kmem_cache_destroy(file_slab);
+out_free_lockowner_slab:
+ kmem_cache_destroy(lockowner_slab);
+out_free_openowner_slab:
+ kmem_cache_destroy(openowner_slab);
+out:
+ dprintk("nfsd4: out of memory while initializing nfsv4\n");
+ return -ENOMEM;
+}
+
+static void init_nfs4_replay(struct nfs4_replay *rp)
+{
+ rp->rp_status = nfserr_serverfault;
+ rp->rp_buflen = 0;
+ rp->rp_buf = rp->rp_ibuf;
+ mutex_init(&rp->rp_mutex);
+}
+
+static void nfsd4_cstate_assign_replay(struct nfsd4_compound_state *cstate,
+ struct nfs4_stateowner *so)
+{
+ if (!nfsd4_has_session(cstate)) {
+ mutex_lock(&so->so_replay.rp_mutex);
+ cstate->replay_owner = nfs4_get_stateowner(so);
+ }
+}
+
+void nfsd4_cstate_clear_replay(struct nfsd4_compound_state *cstate)
+{
+ struct nfs4_stateowner *so = cstate->replay_owner;
+
+ if (so != NULL) {
+ cstate->replay_owner = NULL;
+ mutex_unlock(&so->so_replay.rp_mutex);
+ nfs4_put_stateowner(so);
+ }
+}
+
+static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
+{
+ struct nfs4_stateowner *sop;
+
+ sop = kmem_cache_alloc(slab, GFP_KERNEL);
+ if (!sop)
+ return NULL;
+
+ sop->so_owner.data = kmemdup(owner->data, owner->len, GFP_KERNEL);
+ if (!sop->so_owner.data) {
+ kmem_cache_free(slab, sop);
+ return NULL;
+ }
+ sop->so_owner.len = owner->len;
+
+ INIT_LIST_HEAD(&sop->so_stateids);
+ sop->so_client = clp;
+ init_nfs4_replay(&sop->so_replay);
+ atomic_set(&sop->so_count, 1);
+ return sop;
+}
+
+static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
+{
+ lockdep_assert_held(&clp->cl_lock);
+
+ list_add(&oo->oo_owner.so_strhash,
+ &clp->cl_ownerstr_hashtbl[strhashval]);
+ list_add(&oo->oo_perclient, &clp->cl_openowners);
+}
+
+static void nfs4_unhash_openowner(struct nfs4_stateowner *so)
+{
+ unhash_openowner_locked(openowner(so));
+}
+
+static void nfs4_free_openowner(struct nfs4_stateowner *so)
+{
+ struct nfs4_openowner *oo = openowner(so);
+
+ kmem_cache_free(openowner_slab, oo);
+}
+
+static const struct nfs4_stateowner_operations openowner_ops = {
+ .so_unhash = nfs4_unhash_openowner,
+ .so_free = nfs4_free_openowner,
+};
+
+static struct nfs4_ol_stateid *
+nfsd4_find_existing_open(struct nfs4_file *fp, struct nfsd4_open *open)
+{
+ struct nfs4_ol_stateid *local, *ret = NULL;
+ struct nfs4_openowner *oo = open->op_openowner;
+
+ lockdep_assert_held(&fp->fi_lock);
+
+ list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
+ /* ignore lock owners */
+ if (local->st_stateowner->so_is_open_owner == 0)
+ continue;
+ if (local->st_stateowner == &oo->oo_owner) {
+ ret = local;
+ atomic_inc(&ret->st_stid.sc_count);
+ break;
+ }
+ }
+ return ret;
+}
+
+static struct nfs4_openowner *
+alloc_init_open_stateowner(unsigned int strhashval, struct nfsd4_open *open,
+ struct nfsd4_compound_state *cstate)
+{
+ struct nfs4_client *clp = cstate->clp;
+ struct nfs4_openowner *oo, *ret;
+
+ oo = alloc_stateowner(openowner_slab, &open->op_owner, clp);
+ if (!oo)
+ return NULL;
+ oo->oo_owner.so_ops = &openowner_ops;
+ oo->oo_owner.so_is_open_owner = 1;
+ oo->oo_owner.so_seqid = open->op_seqid;
+ oo->oo_flags = 0;
+ if (nfsd4_has_session(cstate))
+ oo->oo_flags |= NFS4_OO_CONFIRMED;
+ oo->oo_time = 0;
+ oo->oo_last_closed_stid = NULL;
+ INIT_LIST_HEAD(&oo->oo_close_lru);
+ spin_lock(&clp->cl_lock);
+ ret = find_openstateowner_str_locked(strhashval, open, clp);
+ if (ret == NULL) {
+ hash_openowner(oo, clp, strhashval);
+ ret = oo;
+ } else
+ nfs4_free_stateowner(&oo->oo_owner);
+
+ spin_unlock(&clp->cl_lock);
+ return ret;
+}
+
+static struct nfs4_ol_stateid *
+init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp,
+ struct nfsd4_open *open)
+{
+
+ struct nfs4_openowner *oo = open->op_openowner;
+ struct nfs4_ol_stateid *retstp = NULL;
+
+ /* We are moving these outside of the spinlocks to avoid the warnings */
+ mutex_init(&stp->st_mutex);
+ mutex_lock(&stp->st_mutex);
+
+ spin_lock(&oo->oo_owner.so_client->cl_lock);
+ spin_lock(&fp->fi_lock);
+
+ retstp = nfsd4_find_existing_open(fp, open);
+ if (retstp)
+ goto out_unlock;
+ atomic_inc(&stp->st_stid.sc_count);
+ stp->st_stid.sc_type = NFS4_OPEN_STID;
+ INIT_LIST_HEAD(&stp->st_locks);
+ stp->st_stateowner = nfs4_get_stateowner(&oo->oo_owner);
+ get_nfs4_file(fp);
+ stp->st_stid.sc_file = fp;
+ stp->st_access_bmap = 0;
+ stp->st_deny_bmap = 0;
+ stp->st_openstp = NULL;
+ list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
+ list_add(&stp->st_perfile, &fp->fi_stateids);
+
+out_unlock:
+ spin_unlock(&fp->fi_lock);
+ spin_unlock(&oo->oo_owner.so_client->cl_lock);
+ if (retstp) {
+ mutex_lock(&retstp->st_mutex);
+ /* Not that we need to, just for neatness */
+ mutex_unlock(&stp->st_mutex);
+ }
+ return retstp;
+}
+
+/*
+ * In the 4.0 case we need to keep the owners around a little while to handle
+ * CLOSE replay. We still do need to release any file access that is held by
+ * them before returning however.
+ */
+static void
+move_to_close_lru(struct nfs4_ol_stateid *s, struct net *net)
+{
+ struct nfs4_ol_stateid *last;
+ struct nfs4_openowner *oo = openowner(s->st_stateowner);
+ struct nfsd_net *nn = net_generic(s->st_stid.sc_client->net,
+ nfsd_net_id);
+
+ dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
+
+ /*
+ * We know that we hold one reference via nfsd4_close, and another
+ * "persistent" reference for the client. If the refcount is higher
+ * than 2, then there are still calls in progress that are using this
+ * stateid. We can't put the sc_file reference until they are finished.
+ * Wait for the refcount to drop to 2. Since it has been unhashed,
+ * there should be no danger of the refcount going back up again at
+ * this point.
+ */
+ wait_event(close_wq, atomic_read(&s->st_stid.sc_count) == 2);
+
+ release_all_access(s);
+ if (s->st_stid.sc_file) {
+ put_nfs4_file(s->st_stid.sc_file);
+ s->st_stid.sc_file = NULL;
+ }
+
+ spin_lock(&nn->client_lock);
+ last = oo->oo_last_closed_stid;
+ oo->oo_last_closed_stid = s;
+ list_move_tail(&oo->oo_close_lru, &nn->close_lru);
+ oo->oo_time = get_seconds();
+ spin_unlock(&nn->client_lock);
+ if (last)
+ nfs4_put_stid(&last->st_stid);
+}
+
+/* search file_hashtbl[] for file */
+static struct nfs4_file *
+find_file_locked(struct knfsd_fh *fh, unsigned int hashval)
+{
+ struct nfs4_file *fp;
+
+ hlist_for_each_entry_rcu(fp, &file_hashtbl[hashval], fi_hash) {
+ if (fh_match(&fp->fi_fhandle, fh)) {
+ if (atomic_inc_not_zero(&fp->fi_ref))
+ return fp;
+ }
+ }
+ return NULL;
+}
+
+struct nfs4_file *
+find_file(struct knfsd_fh *fh)
+{
+ struct nfs4_file *fp;
+ unsigned int hashval = file_hashval(fh);
+
+ rcu_read_lock();
+ fp = find_file_locked(fh, hashval);
+ rcu_read_unlock();
+ return fp;
+}
+
+static struct nfs4_file *
+find_or_add_file(struct nfs4_file *new, struct knfsd_fh *fh)
+{
+ struct nfs4_file *fp;
+ unsigned int hashval = file_hashval(fh);
+
+ rcu_read_lock();
+ fp = find_file_locked(fh, hashval);
+ rcu_read_unlock();
+ if (fp)
+ return fp;
+
+ spin_lock(&state_lock);
+ fp = find_file_locked(fh, hashval);
+ if (likely(fp == NULL)) {
+ nfsd4_init_file(fh, hashval, new);
+ fp = new;
+ }
+ spin_unlock(&state_lock);
+
+ return fp;
+}
+
+/*
+ * Called to check deny when READ with all zero stateid or
+ * WRITE with all zero or all one stateid
+ */
+static __be32
+nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
+{
+ struct nfs4_file *fp;
+ __be32 ret = nfs_ok;
+
+ fp = find_file(¤t_fh->fh_handle);
+ if (!fp)
+ return ret;
+ /* Check for conflicting share reservations */
+ spin_lock(&fp->fi_lock);
+ if (fp->fi_share_deny & deny_type)
+ ret = nfserr_locked;
+ spin_unlock(&fp->fi_lock);
+ put_nfs4_file(fp);
+ return ret;
+}
+
+static void nfsd4_cb_recall_prepare(struct nfsd4_callback *cb)
+{
+ struct nfs4_delegation *dp = cb_to_delegation(cb);
+ struct nfsd_net *nn = net_generic(dp->dl_stid.sc_client->net,
+ nfsd_net_id);
+
+ block_delegations(&dp->dl_stid.sc_file->fi_fhandle);
+
+ /*
+ * We can't do this in nfsd_break_deleg_cb because it is
+ * already holding inode->i_lock.
+ *
+ * If the dl_time != 0, then we know that it has already been
+ * queued for a lease break. Don't queue it again.
+ */
+ spin_lock(&state_lock);
+ if (dp->dl_time == 0) {
+ dp->dl_time = get_seconds();
+ list_add_tail(&dp->dl_recall_lru, &nn->del_recall_lru);
+ }
+ spin_unlock(&state_lock);
+}
+
+static int nfsd4_cb_recall_done(struct nfsd4_callback *cb,
+ struct rpc_task *task)
+{
+ struct nfs4_delegation *dp = cb_to_delegation(cb);
+
+ if (dp->dl_stid.sc_type == NFS4_CLOSED_DELEG_STID)
+ return 1;
+
+ switch (task->tk_status) {
+ case 0:
+ return 1;
+ case -EBADHANDLE:
+ case -NFS4ERR_BAD_STATEID:
+ /*
+ * Race: client probably got cb_recall before open reply
+ * granting delegation.
+ */
+ if (dp->dl_retries--) {
+ rpc_delay(task, 2 * HZ);
+ return 0;
+ }
+ /*FALLTHRU*/
+ default:
+ return -1;
+ }
+}
+
+static void nfsd4_cb_recall_release(struct nfsd4_callback *cb)
+{
+ struct nfs4_delegation *dp = cb_to_delegation(cb);
+
+ nfs4_put_stid(&dp->dl_stid);
+}
+
+static struct nfsd4_callback_ops nfsd4_cb_recall_ops = {
+ .prepare = nfsd4_cb_recall_prepare,
+ .done = nfsd4_cb_recall_done,
+ .release = nfsd4_cb_recall_release,
+};
+
+static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
+{
+ /*
+ * We're assuming the state code never drops its reference
+ * without first removing the lease. Since we're in this lease
+ * callback (and since the lease code is serialized by the kernel
+ * lock) we know the server hasn't removed the lease yet, we know
+ * it's safe to take a reference.
+ */
+ atomic_inc(&dp->dl_stid.sc_count);
+ nfsd4_run_cb(&dp->dl_recall);
+}
+
+/* Called from break_lease() with i_lock held. */
+static bool
+nfsd_break_deleg_cb(struct file_lock *fl)
+{
+ bool ret = false;
+ struct nfs4_file *fp = (struct nfs4_file *)fl->fl_owner;
+ struct nfs4_delegation *dp;
+
+ if (!fp) {
+ WARN(1, "(%p)->fl_owner NULL\n", fl);
+ return ret;
+ }
+ if (fp->fi_had_conflict) {
+ WARN(1, "duplicate break on %p\n", fp);
+ return ret;
+ }
+ /*
+ * We don't want the locks code to timeout the lease for us;
+ * we'll remove it ourself if a delegation isn't returned
+ * in time:
+ */
+ fl->fl_break_time = 0;
+
+ spin_lock(&fp->fi_lock);
+ fp->fi_had_conflict = true;
+ /*
+ * If there are no delegations on the list, then return true
+ * so that the lease code will go ahead and delete it.
+ */
+ if (list_empty(&fp->fi_delegations))
+ ret = true;
+ else
+ list_for_each_entry(dp, &fp->fi_delegations, dl_perfile)
+ nfsd_break_one_deleg(dp);
+ spin_unlock(&fp->fi_lock);
+ return ret;
+}
+
+static int
+nfsd_change_deleg_cb(struct file_lock *onlist, int arg,
+ struct list_head *dispose)
+{
+ if (arg & F_UNLCK)
+ return lease_modify(onlist, arg, dispose);
+ else
+ return -EAGAIN;
+}
+
+static const struct lock_manager_operations nfsd_lease_mng_ops = {
+ .lm_break = nfsd_break_deleg_cb,
+ .lm_change = nfsd_change_deleg_cb,
+};
+
+static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
+{
+ if (nfsd4_has_session(cstate))
+ return nfs_ok;
+ if (seqid == so->so_seqid - 1)
+ return nfserr_replay_me;
+ if (seqid == so->so_seqid)
+ return nfs_ok;
+ return nfserr_bad_seqid;
+}
+
+static __be32 lookup_clientid(clientid_t *clid,
+ struct nfsd4_compound_state *cstate,
+ struct nfsd_net *nn)
+{
+ struct nfs4_client *found;
+
+ if (cstate->clp) {
+ found = cstate->clp;
+ if (!same_clid(&found->cl_clientid, clid))
+ return nfserr_stale_clientid;
+ return nfs_ok;
+ }
+
+ if (STALE_CLIENTID(clid, nn))
+ return nfserr_stale_clientid;
+
+ /*
+ * For v4.1+ we get the client in the SEQUENCE op. If we don't have one
+ * cached already then we know this is for is for v4.0 and "sessions"
+ * will be false.
+ */
+ WARN_ON_ONCE(cstate->session);
+ spin_lock(&nn->client_lock);
+ found = find_confirmed_client(clid, false, nn);
+ if (!found) {
+ spin_unlock(&nn->client_lock);
+ return nfserr_expired;
+ }
+ atomic_inc(&found->cl_refcount);
+ spin_unlock(&nn->client_lock);
+
+ /* Cache the nfs4_client in cstate! */
+ cstate->clp = found;
+ return nfs_ok;
+}
+
+__be32
+nfsd4_process_open1(struct nfsd4_compound_state *cstate,
+ struct nfsd4_open *open, struct nfsd_net *nn)
+{
+ clientid_t *clientid = &open->op_clientid;
+ struct nfs4_client *clp = NULL;
+ unsigned int strhashval;
+ struct nfs4_openowner *oo = NULL;
+ __be32 status;
+
+ if (STALE_CLIENTID(&open->op_clientid, nn))
+ return nfserr_stale_clientid;
+ /*
+ * In case we need it later, after we've already created the
+ * file and don't want to risk a further failure:
+ */
+ open->op_file = nfsd4_alloc_file();
+ if (open->op_file == NULL)
+ return nfserr_jukebox;
+
+ status = lookup_clientid(clientid, cstate, nn);
+ if (status)
+ return status;
+ clp = cstate->clp;
+
+ strhashval = ownerstr_hashval(&open->op_owner);
+ oo = find_openstateowner_str(strhashval, open, clp);
+ open->op_openowner = oo;
+ if (!oo) {
+ goto new_owner;
+ }
+ if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
+ /* Replace unconfirmed owners without checking for replay. */
+ release_openowner(oo);
+ open->op_openowner = NULL;
+ goto new_owner;
+ }
+ status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
+ if (status)
+ return status;
+ goto alloc_stateid;
+new_owner:
+ oo = alloc_init_open_stateowner(strhashval, open, cstate);
+ if (oo == NULL)
+ return nfserr_jukebox;
+ open->op_openowner = oo;
+alloc_stateid:
+ open->op_stp = nfs4_alloc_open_stateid(clp);
+ if (!open->op_stp)
+ return nfserr_jukebox;
+
+ if (nfsd4_has_session(cstate) &&
+ (cstate->current_fh.fh_export->ex_flags & NFSEXP_PNFS)) {
+ open->op_odstate = alloc_clnt_odstate(clp);
+ if (!open->op_odstate)
+ return nfserr_jukebox;
+ }
+
+ return nfs_ok;
+}
+
+static inline __be32
+nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
+{
+ if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
+ return nfserr_openmode;
+ else
+ return nfs_ok;
+}
+
+static int share_access_to_flags(u32 share_access)
+{
+ return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
+}
+
+static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s)
+{
+ struct nfs4_stid *ret;
+
+ ret = find_stateid_by_type(cl, s, NFS4_DELEG_STID);
+ if (!ret)
+ return NULL;
+ return delegstateid(ret);
+}
+
+static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
+{
+ return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
+ open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
+}
+
+static __be32
+nfs4_check_deleg(struct nfs4_client *cl, struct nfsd4_open *open,
+ struct nfs4_delegation **dp)
+{
+ int flags;
+ __be32 status = nfserr_bad_stateid;
+ struct nfs4_delegation *deleg;
+
+ deleg = find_deleg_stateid(cl, &open->op_delegate_stateid);
+ if (deleg == NULL)
+ goto out;
+ flags = share_access_to_flags(open->op_share_access);
+ status = nfs4_check_delegmode(deleg, flags);
+ if (status) {
+ nfs4_put_stid(&deleg->dl_stid);
+ goto out;
+ }
+ *dp = deleg;
+out:
+ if (!nfsd4_is_deleg_cur(open))
+ return nfs_ok;
+ if (status)
+ return status;
+ open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
+ return nfs_ok;
+}
+
+static inline int nfs4_access_to_access(u32 nfs4_access)
+{
+ int flags = 0;
+
+ if (nfs4_access & NFS4_SHARE_ACCESS_READ)
+ flags |= NFSD_MAY_READ;
+ if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
+ flags |= NFSD_MAY_WRITE;
+ return flags;
+}
+
+static inline __be32
+nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
+ struct nfsd4_open *open)
+{
+ struct iattr iattr = {
+ .ia_valid = ATTR_SIZE,
+ .ia_size = 0,
+ };
+ if (!open->op_truncate)
+ return 0;
+ if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
+ return nfserr_inval;
+ return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
+}
+
+static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
+ struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp,
+ struct nfsd4_open *open)
+{
+ struct file *filp = NULL;
+ __be32 status;
+ int oflag = nfs4_access_to_omode(open->op_share_access);
+ int access = nfs4_access_to_access(open->op_share_access);
+ unsigned char old_access_bmap, old_deny_bmap;
+
+ spin_lock(&fp->fi_lock);
+
+ /*
+ * Are we trying to set a deny mode that would conflict with
+ * current access?
+ */
+ status = nfs4_file_check_deny(fp, open->op_share_deny);
+ if (status != nfs_ok) {
+ spin_unlock(&fp->fi_lock);
+ goto out;
+ }
+
+ /* set access to the file */
+ status = nfs4_file_get_access(fp, open->op_share_access);
+ if (status != nfs_ok) {
+ spin_unlock(&fp->fi_lock);
+ goto out;
+ }
+
+ /* Set access bits in stateid */
+ old_access_bmap = stp->st_access_bmap;
+ set_access(open->op_share_access, stp);
+
+ /* Set new deny mask */
+ old_deny_bmap = stp->st_deny_bmap;
+ set_deny(open->op_share_deny, stp);
+ fp->fi_share_deny |= (open->op_share_deny & NFS4_SHARE_DENY_BOTH);
+
+ if (!fp->fi_fds[oflag]) {
+ spin_unlock(&fp->fi_lock);
+ status = nfsd_open(rqstp, cur_fh, S_IFREG, access, &filp);
+ if (status)
+ goto out_put_access;
+ spin_lock(&fp->fi_lock);
+ if (!fp->fi_fds[oflag]) {
+ fp->fi_fds[oflag] = filp;
+ filp = NULL;
+ }
+ }
+ spin_unlock(&fp->fi_lock);
+ if (filp)
+ fput(filp);
+
+ status = nfsd4_truncate(rqstp, cur_fh, open);
+ if (status)
+ goto out_put_access;
+out:
+ return status;
+out_put_access:
+ stp->st_access_bmap = old_access_bmap;
+ nfs4_file_put_access(fp, open->op_share_access);
+ reset_union_bmap_deny(bmap_to_share_mode(old_deny_bmap), stp);
+ goto out;
+}
+
+static __be32
+nfs4_upgrade_open(struct svc_rqst *rqstp, struct nfs4_file *fp, struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp, struct nfsd4_open *open)
+{
+ __be32 status;
+ unsigned char old_deny_bmap = stp->st_deny_bmap;
+
+ if (!test_access(open->op_share_access, stp))
+ return nfs4_get_vfs_file(rqstp, fp, cur_fh, stp, open);
+
+ /* test and set deny mode */
+ spin_lock(&fp->fi_lock);
+ status = nfs4_file_check_deny(fp, open->op_share_deny);
+ if (status == nfs_ok) {
+ set_deny(open->op_share_deny, stp);
+ fp->fi_share_deny |=
+ (open->op_share_deny & NFS4_SHARE_DENY_BOTH);
+ }
+ spin_unlock(&fp->fi_lock);
+
+ if (status != nfs_ok)
+ return status;
+
+ status = nfsd4_truncate(rqstp, cur_fh, open);
+ if (status != nfs_ok)
+ reset_union_bmap_deny(old_deny_bmap, stp);
+ return status;
+}
+
+/* Should we give out recallable state?: */
+static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
+{
+ if (clp->cl_cb_state == NFSD4_CB_UP)
+ return true;
+ /*
+ * In the sessions case, since we don't have to establish a
+ * separate connection for callbacks, we assume it's OK
+ * until we hear otherwise:
+ */
+ return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
+}
+
+static struct file_lock *nfs4_alloc_init_lease(struct nfs4_file *fp, int flag)
+{
+ struct file_lock *fl;
+
+ fl = locks_alloc_lock();
+ if (!fl)
+ return NULL;
+ fl->fl_lmops = &nfsd_lease_mng_ops;
+ fl->fl_flags = FL_DELEG;
+ fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
+ fl->fl_end = OFFSET_MAX;
+ fl->fl_owner = (fl_owner_t)fp;
+ fl->fl_pid = current->tgid;
+ return fl;
+}
+
+/**
+ * nfs4_setlease - Obtain a delegation by requesting lease from vfs layer
+ * @dp: a pointer to the nfs4_delegation we're adding.
+ *
+ * Return:
+ * On success: Return code will be 0 on success.
+ *
+ * On error: -EAGAIN if there was an existing delegation.
+ * nonzero if there is an error in other cases.
+ *
+ */
+
+static int nfs4_setlease(struct nfs4_delegation *dp)
+{
+ struct nfs4_file *fp = dp->dl_stid.sc_file;
+ struct file_lock *fl;
+ struct file *filp;
+ int status = 0;
+
+ fl = nfs4_alloc_init_lease(fp, NFS4_OPEN_DELEGATE_READ);
+ if (!fl)
+ return -ENOMEM;
+ filp = find_readable_file(fp);
+ if (!filp) {
+ /* We should always have a readable file here */
+ WARN_ON_ONCE(1);
+ locks_free_lock(fl);
+ return -EBADF;
+ }
+ fl->fl_file = filp;
+ status = vfs_setlease(filp, fl->fl_type, &fl, NULL);
+ if (fl)
+ locks_free_lock(fl);
+ if (status)
+ goto out_fput;
+ spin_lock(&state_lock);
+ spin_lock(&fp->fi_lock);
+ /* Did the lease get broken before we took the lock? */
+ status = -EAGAIN;
+ if (fp->fi_had_conflict)
+ goto out_unlock;
+ /* Race breaker */
+ if (fp->fi_deleg_file) {
+ status = hash_delegation_locked(dp, fp);
+ goto out_unlock;
+ }
+ fp->fi_deleg_file = filp;
+ fp->fi_delegees = 0;
+ status = hash_delegation_locked(dp, fp);
+ spin_unlock(&fp->fi_lock);
+ spin_unlock(&state_lock);
+ if (status) {
+ /* Should never happen, this is a new fi_deleg_file */
+ WARN_ON_ONCE(1);
+ goto out_fput;
+ }
+ return 0;
+out_unlock:
+ spin_unlock(&fp->fi_lock);
+ spin_unlock(&state_lock);
+out_fput:
+ fput(filp);
+ return status;
+}
+
+static struct nfs4_delegation *
+nfs4_set_delegation(struct nfs4_client *clp, struct svc_fh *fh,
+ struct nfs4_file *fp, struct nfs4_clnt_odstate *odstate)
+{
+ int status;
+ struct nfs4_delegation *dp;
+
+ if (fp->fi_had_conflict)
+ return ERR_PTR(-EAGAIN);
+
+ spin_lock(&state_lock);
+ spin_lock(&fp->fi_lock);
+ status = nfs4_get_existing_delegation(clp, fp);
+ spin_unlock(&fp->fi_lock);
+ spin_unlock(&state_lock);
+
+ if (status)
+ return ERR_PTR(status);
+
+ dp = alloc_init_deleg(clp, fh, odstate);
+ if (!dp)
+ return ERR_PTR(-ENOMEM);
+
+ get_nfs4_file(fp);
+ spin_lock(&state_lock);
+ spin_lock(&fp->fi_lock);
+ dp->dl_stid.sc_file = fp;
+ if (!fp->fi_deleg_file) {
+ spin_unlock(&fp->fi_lock);
+ spin_unlock(&state_lock);
+ status = nfs4_setlease(dp);
+ goto out;
+ }
+ if (fp->fi_had_conflict) {
+ status = -EAGAIN;
+ goto out_unlock;
+ }
+ status = hash_delegation_locked(dp, fp);
+out_unlock:
+ spin_unlock(&fp->fi_lock);
+ spin_unlock(&state_lock);
+out:
+ if (status) {
+ put_clnt_odstate(dp->dl_clnt_odstate);
+ nfs4_put_stid(&dp->dl_stid);
+ return ERR_PTR(status);
+ }
+ return dp;
+}
+
+static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
+{
+ open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
+ if (status == -EAGAIN)
+ open->op_why_no_deleg = WND4_CONTENTION;
+ else {
+ open->op_why_no_deleg = WND4_RESOURCE;
+ switch (open->op_deleg_want) {
+ case NFS4_SHARE_WANT_READ_DELEG:
+ case NFS4_SHARE_WANT_WRITE_DELEG:
+ case NFS4_SHARE_WANT_ANY_DELEG:
+ break;
+ case NFS4_SHARE_WANT_CANCEL:
+ open->op_why_no_deleg = WND4_CANCELLED;
+ break;
+ case NFS4_SHARE_WANT_NO_DELEG:
+ WARN_ON_ONCE(1);
+ }
+ }
+}
+
+/*
+ * Attempt to hand out a delegation.
+ *
+ * Note we don't support write delegations, and won't until the vfs has
+ * proper support for them.
+ */
+static void
+nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open,
+ struct nfs4_ol_stateid *stp)
+{
+ struct nfs4_delegation *dp;
+ struct nfs4_openowner *oo = openowner(stp->st_stateowner);
+ struct nfs4_client *clp = stp->st_stid.sc_client;
+ int cb_up;
+ int status = 0;
+
+ cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
+ open->op_recall = 0;
+ switch (open->op_claim_type) {
+ case NFS4_OPEN_CLAIM_PREVIOUS:
+ if (!cb_up)
+ open->op_recall = 1;
+ if (open->op_delegate_type != NFS4_OPEN_DELEGATE_READ)
+ goto out_no_deleg;
+ break;
+ case NFS4_OPEN_CLAIM_NULL:
+ case NFS4_OPEN_CLAIM_FH:
+ /*
+ * Let's not give out any delegations till everyone's
+ * had the chance to reclaim theirs, *and* until
+ * NLM locks have all been reclaimed:
+ */
+ if (locks_in_grace(clp->net))
+ goto out_no_deleg;
+ if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
+ goto out_no_deleg;
+ /*
+ * Also, if the file was opened for write or
+ * create, there's a good chance the client's
+ * about to write to it, resulting in an
+ * immediate recall (since we don't support
+ * write delegations):
+ */
+ if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
+ goto out_no_deleg;
+ if (open->op_create == NFS4_OPEN_CREATE)
+ goto out_no_deleg;
+ break;
+ default:
+ goto out_no_deleg;
+ }
+ dp = nfs4_set_delegation(clp, fh, stp->st_stid.sc_file, stp->st_clnt_odstate);
+ if (IS_ERR(dp))
+ goto out_no_deleg;
+
+ memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
+
+ dprintk("NFSD: delegation stateid=" STATEID_FMT "\n",
+ STATEID_VAL(&dp->dl_stid.sc_stateid));
+ open->op_delegate_type = NFS4_OPEN_DELEGATE_READ;
+ nfs4_put_stid(&dp->dl_stid);
+ return;
+out_no_deleg:
+ open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE;
+ if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS &&
+ open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE) {
+ dprintk("NFSD: WARNING: refusing delegation reclaim\n");
+ open->op_recall = 1;
+ }
+
+ /* 4.1 client asking for a delegation? */
+ if (open->op_deleg_want)
+ nfsd4_open_deleg_none_ext(open, status);
+ return;
+}
+
+static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
+ struct nfs4_delegation *dp)
+{
+ if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG &&
+ dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
+ open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
+ open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
+ } else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG &&
+ dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
+ open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
+ open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
+ }
+ /* Otherwise the client must be confused wanting a delegation
+ * it already has, therefore we don't return
+ * NFS4_OPEN_DELEGATE_NONE_EXT and reason.
+ */
+}
+
+__be32
+nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
+{
+ struct nfsd4_compoundres *resp = rqstp->rq_resp;
+ struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
+ struct nfs4_file *fp = NULL;
+ struct nfs4_ol_stateid *stp = NULL;
+ struct nfs4_ol_stateid *swapstp = NULL;
+ struct nfs4_delegation *dp = NULL;
+ __be32 status;
+
+ /*
+ * Lookup file; if found, lookup stateid and check open request,
+ * and check for delegations in the process of being recalled.
+ * If not found, create the nfs4_file struct
+ */
+ fp = find_or_add_file(open->op_file, ¤t_fh->fh_handle);
+ if (fp != open->op_file) {
+ status = nfs4_check_deleg(cl, open, &dp);
+ if (status)
+ goto out;
+ spin_lock(&fp->fi_lock);
+ stp = nfsd4_find_existing_open(fp, open);
+ spin_unlock(&fp->fi_lock);
+ } else {
+ open->op_file = NULL;
+ status = nfserr_bad_stateid;
+ if (nfsd4_is_deleg_cur(open))
+ goto out;
+ }
+
+ /*
+ * OPEN the file, or upgrade an existing OPEN.
+ * If truncate fails, the OPEN fails.
+ */
+ if (stp) {
+ /* Stateid was found, this is an OPEN upgrade */
+ mutex_lock(&stp->st_mutex);
+ status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
+ if (status) {
+ mutex_unlock(&stp->st_mutex);
+ goto out;
+ }
+ } else {
+ stp = open->op_stp;
+ open->op_stp = NULL;
+ /*
+ * init_open_stateid() either returns a locked stateid
+ * it found, or initializes and locks the new one we passed in
+ */
+ swapstp = init_open_stateid(stp, fp, open);
+ if (swapstp) {
+ nfs4_put_stid(&stp->st_stid);
+ stp = swapstp;
+ status = nfs4_upgrade_open(rqstp, fp, current_fh,
+ stp, open);
+ if (status) {
+ mutex_unlock(&stp->st_mutex);
+ goto out;
+ }
+ goto upgrade_out;
+ }
+ status = nfs4_get_vfs_file(rqstp, fp, current_fh, stp, open);
+ if (status) {
+ mutex_unlock(&stp->st_mutex);
+ release_open_stateid(stp);
+ goto out;
+ }
+
+ stp->st_clnt_odstate = find_or_hash_clnt_odstate(fp,
+ open->op_odstate);
+ if (stp->st_clnt_odstate == open->op_odstate)
+ open->op_odstate = NULL;
+ }
+upgrade_out:
+ nfs4_inc_and_copy_stateid(&open->op_stateid, &stp->st_stid);
+ mutex_unlock(&stp->st_mutex);
+
+ if (nfsd4_has_session(&resp->cstate)) {
+ if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
+ open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
+ open->op_why_no_deleg = WND4_NOT_WANTED;
+ goto nodeleg;
+ }
+ }
+
+ /*
+ * Attempt to hand out a delegation. No error return, because the
+ * OPEN succeeds even if we fail.
+ */
+ nfs4_open_delegation(current_fh, open, stp);
+nodeleg:
+ status = nfs_ok;
+
+ dprintk("%s: stateid=" STATEID_FMT "\n", __func__,
+ STATEID_VAL(&stp->st_stid.sc_stateid));
+out:
+ /* 4.1 client trying to upgrade/downgrade delegation? */
+ if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp &&
+ open->op_deleg_want)
+ nfsd4_deleg_xgrade_none_ext(open, dp);
+
+ if (fp)
+ put_nfs4_file(fp);
+ if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
+ open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
+ /*
+ * To finish the open response, we just need to set the rflags.
+ */
+ open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
+ if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED) &&
+ !nfsd4_has_session(&resp->cstate))
+ open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
+ if (dp)
+ nfs4_put_stid(&dp->dl_stid);
+ if (stp)
+ nfs4_put_stid(&stp->st_stid);
+
+ return status;
+}
+
+void nfsd4_cleanup_open_state(struct nfsd4_compound_state *cstate,
+ struct nfsd4_open *open)
+{
+ if (open->op_openowner) {
+ struct nfs4_stateowner *so = &open->op_openowner->oo_owner;
+
+ nfsd4_cstate_assign_replay(cstate, so);
+ nfs4_put_stateowner(so);
+ }
+ if (open->op_file)
+ kmem_cache_free(file_slab, open->op_file);
+ if (open->op_stp)
+ nfs4_put_stid(&open->op_stp->st_stid);
+ if (open->op_odstate)
+ kmem_cache_free(odstate_slab, open->op_odstate);
+}
+
+__be32
+nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
+ clientid_t *clid)
+{
+ struct nfs4_client *clp;
+ __be32 status;
+ struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
+
+ dprintk("process_renew(%08x/%08x): starting\n",
+ clid->cl_boot, clid->cl_id);
+ status = lookup_clientid(clid, cstate, nn);
+ if (status)
+ goto out;
+ clp = cstate->clp;
+ status = nfserr_cb_path_down;
+ if (!list_empty(&clp->cl_delegations)
+ && clp->cl_cb_state != NFSD4_CB_UP)
+ goto out;
+ status = nfs_ok;
+out:
+ return status;
+}
+
+void
+nfsd4_end_grace(struct nfsd_net *nn)
+{
+ /* do nothing if grace period already ended */
+ if (nn->grace_ended)
+ return;
+
+ dprintk("NFSD: end of grace period\n");
+ nn->grace_ended = true;
+ /*
+ * If the server goes down again right now, an NFSv4
+ * client will still be allowed to reclaim after it comes back up,
+ * even if it hasn't yet had a chance to reclaim state this time.
+ *
+ */
+ nfsd4_record_grace_done(nn);
+ /*
+ * At this point, NFSv4 clients can still reclaim. But if the
+ * server crashes, any that have not yet reclaimed will be out
+ * of luck on the next boot.
+ *
+ * (NFSv4.1+ clients are considered to have reclaimed once they
+ * call RECLAIM_COMPLETE. NFSv4.0 clients are considered to
+ * have reclaimed after their first OPEN.)
+ */
+ locks_end_grace(&nn->nfsd4_manager);
+ /*
+ * At this point, and once lockd and/or any other containers
+ * exit their grace period, further reclaims will fail and
+ * regular locking can resume.
+ */
+}
+
+static time_t
+nfs4_laundromat(struct nfsd_net *nn)
+{
+ struct nfs4_client *clp;
+ struct nfs4_openowner *oo;
+ struct nfs4_delegation *dp;
+ struct nfs4_ol_stateid *stp;
+ struct list_head *pos, *next, reaplist;
+ time_t cutoff = get_seconds() - nn->nfsd4_lease;
+ time_t t, new_timeo = nn->nfsd4_lease;
+
+ dprintk("NFSD: laundromat service - starting\n");
+ nfsd4_end_grace(nn);
+ INIT_LIST_HEAD(&reaplist);
+ spin_lock(&nn->client_lock);
+ list_for_each_safe(pos, next, &nn->client_lru) {
+ clp = list_entry(pos, struct nfs4_client, cl_lru);
+ if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
+ t = clp->cl_time - cutoff;
+ new_timeo = min(new_timeo, t);
+ break;
+ }
+ if (mark_client_expired_locked(clp)) {
+ dprintk("NFSD: client in use (clientid %08x)\n",
+ clp->cl_clientid.cl_id);
+ continue;
+ }
+ list_add(&clp->cl_lru, &reaplist);
+ }
+ spin_unlock(&nn->client_lock);
+ list_for_each_safe(pos, next, &reaplist) {
+ clp = list_entry(pos, struct nfs4_client, cl_lru);
+ dprintk("NFSD: purging unused client (clientid %08x)\n",
+ clp->cl_clientid.cl_id);
+ list_del_init(&clp->cl_lru);
+ expire_client(clp);
+ }
+ spin_lock(&state_lock);
+ list_for_each_safe(pos, next, &nn->del_recall_lru) {
+ dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
+ if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
+ t = dp->dl_time - cutoff;
+ new_timeo = min(new_timeo, t);
+ break;
+ }
+ WARN_ON(!unhash_delegation_locked(dp));
+ list_add(&dp->dl_recall_lru, &reaplist);
+ }
+ spin_unlock(&state_lock);
+ while (!list_empty(&reaplist)) {
+ dp = list_first_entry(&reaplist, struct nfs4_delegation,
+ dl_recall_lru);
+ list_del_init(&dp->dl_recall_lru);
+ revoke_delegation(dp);
+ }
+
+ spin_lock(&nn->client_lock);
+ while (!list_empty(&nn->close_lru)) {
+ oo = list_first_entry(&nn->close_lru, struct nfs4_openowner,
+ oo_close_lru);
+ if (time_after((unsigned long)oo->oo_time,
+ (unsigned long)cutoff)) {
+ t = oo->oo_time - cutoff;
+ new_timeo = min(new_timeo, t);
+ break;
+ }
+ list_del_init(&oo->oo_close_lru);
+ stp = oo->oo_last_closed_stid;
+ oo->oo_last_closed_stid = NULL;
+ spin_unlock(&nn->client_lock);
+ nfs4_put_stid(&stp->st_stid);
+ spin_lock(&nn->client_lock);
+ }
+ spin_unlock(&nn->client_lock);
+
+ new_timeo = max_t(time_t, new_timeo, NFSD_LAUNDROMAT_MINTIMEOUT);
+ return new_timeo;
+}
+
+static struct workqueue_struct *laundry_wq;
+static void laundromat_main(struct work_struct *);
+
+static void
+laundromat_main(struct work_struct *laundry)
+{
+ time_t t;
+ struct delayed_work *dwork = container_of(laundry, struct delayed_work,
+ work);
+ struct nfsd_net *nn = container_of(dwork, struct nfsd_net,
+ laundromat_work);
+
+ t = nfs4_laundromat(nn);
+ dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
+ queue_delayed_work(laundry_wq, &nn->laundromat_work, t*HZ);
+}
+
+static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stid *stp)
+{
+ if (!fh_match(&fhp->fh_handle, &stp->sc_file->fi_fhandle))
+ return nfserr_bad_stateid;
+ return nfs_ok;
+}
+
+static inline int
+access_permit_read(struct nfs4_ol_stateid *stp)
+{
+ return test_access(NFS4_SHARE_ACCESS_READ, stp) ||
+ test_access(NFS4_SHARE_ACCESS_BOTH, stp) ||
+ test_access(NFS4_SHARE_ACCESS_WRITE, stp);
+}
+
+static inline int
+access_permit_write(struct nfs4_ol_stateid *stp)
+{
+ return test_access(NFS4_SHARE_ACCESS_WRITE, stp) ||
+ test_access(NFS4_SHARE_ACCESS_BOTH, stp);
+}
+
+static
+__be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags)
+{
+ __be32 status = nfserr_openmode;
+
+ /* For lock stateid's, we test the parent open, not the lock: */
+ if (stp->st_openstp)
+ stp = stp->st_openstp;
+ if ((flags & WR_STATE) && !access_permit_write(stp))
+ goto out;
+ if ((flags & RD_STATE) && !access_permit_read(stp))
+ goto out;
+ status = nfs_ok;
+out:
+ return status;
+}
+
+static inline __be32
+check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid, int flags)
+{
+ if (ONE_STATEID(stateid) && (flags & RD_STATE))
+ return nfs_ok;
+ else if (opens_in_grace(net)) {
+ /* Answer in remaining cases depends on existence of
+ * conflicting state; so we must wait out the grace period. */
+ return nfserr_grace;
+ } else if (flags & WR_STATE)
+ return nfs4_share_conflict(current_fh,
+ NFS4_SHARE_DENY_WRITE);
+ else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
+ return nfs4_share_conflict(current_fh,
+ NFS4_SHARE_DENY_READ);
+}
+
+/*
+ * Allow READ/WRITE during grace period on recovered state only for files
+ * that are not able to provide mandatory locking.
+ */
+static inline int
+grace_disallows_io(struct net *net, struct inode *inode)
+{
+ return opens_in_grace(net) && mandatory_lock(inode);
+}
+
+/* Returns true iff a is later than b: */
+static bool stateid_generation_after(stateid_t *a, stateid_t *b)
+{
+ return (s32)(a->si_generation - b->si_generation) > 0;
+}
+
+static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session)
+{
+ /*
+ * When sessions are used the stateid generation number is ignored
+ * when it is zero.
+ */
+ if (has_session && in->si_generation == 0)
+ return nfs_ok;
+
+ if (in->si_generation == ref->si_generation)
+ return nfs_ok;
+
+ /* If the client sends us a stateid from the future, it's buggy: */
+ if (stateid_generation_after(in, ref))
+ return nfserr_bad_stateid;
+ /*
+ * However, we could see a stateid from the past, even from a
+ * non-buggy client. For example, if the client sends a lock
+ * while some IO is outstanding, the lock may bump si_generation
+ * while the IO is still in flight. The client could avoid that
+ * situation by waiting for responses on all the IO requests,
+ * but better performance may result in retrying IO that
+ * receives an old_stateid error if requests are rarely
+ * reordered in flight:
+ */
+ return nfserr_old_stateid;
+}
+
+static __be32 nfsd4_check_openowner_confirmed(struct nfs4_ol_stateid *ols)
+{
+ if (ols->st_stateowner->so_is_open_owner &&
+ !(openowner(ols->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
+ return nfserr_bad_stateid;
+ return nfs_ok;
+}
+
+static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
+{
+ struct nfs4_stid *s;
+ __be32 status = nfserr_bad_stateid;
+
+ if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
+ return status;
+ /* Client debugging aid. */
+ if (!same_clid(&stateid->si_opaque.so_clid, &cl->cl_clientid)) {
+ char addr_str[INET6_ADDRSTRLEN];
+ rpc_ntop((struct sockaddr *)&cl->cl_addr, addr_str,
+ sizeof(addr_str));
+ pr_warn_ratelimited("NFSD: client %s testing state ID "
+ "with incorrect client ID\n", addr_str);
+ return status;
+ }
+ spin_lock(&cl->cl_lock);
+ s = find_stateid_locked(cl, stateid);
+ if (!s)
+ goto out_unlock;
+ status = check_stateid_generation(stateid, &s->sc_stateid, 1);
+ if (status)
+ goto out_unlock;
+ switch (s->sc_type) {
+ case NFS4_DELEG_STID:
+ status = nfs_ok;
+ break;
+ case NFS4_REVOKED_DELEG_STID:
+ status = nfserr_deleg_revoked;
+ break;
+ case NFS4_OPEN_STID:
+ case NFS4_LOCK_STID:
+ status = nfsd4_check_openowner_confirmed(openlockstateid(s));
+ break;
+ default:
+ printk("unknown stateid type %x\n", s->sc_type);
+ /* Fallthrough */
+ case NFS4_CLOSED_STID:
+ case NFS4_CLOSED_DELEG_STID:
+ status = nfserr_bad_stateid;
+ }
+out_unlock:
+ spin_unlock(&cl->cl_lock);
+ return status;
+}
+
+__be32
+nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
+ stateid_t *stateid, unsigned char typemask,
+ struct nfs4_stid **s, struct nfsd_net *nn)
+{
+ __be32 status;
+
+ if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
+ return nfserr_bad_stateid;
+ status = lookup_clientid(&stateid->si_opaque.so_clid, cstate, nn);
+ if (status == nfserr_stale_clientid) {
+ if (cstate->session)
+ return nfserr_bad_stateid;
+ return nfserr_stale_stateid;
+ }
+ if (status)
+ return status;
+ *s = find_stateid_by_type(cstate->clp, stateid, typemask);
+ if (!*s)
+ return nfserr_bad_stateid;
+ return nfs_ok;
+}
+
+static struct file *
+nfs4_find_file(struct nfs4_stid *s, int flags)
+{
+ if (!s)
+ return NULL;
+
+ switch (s->sc_type) {
+ case NFS4_DELEG_STID:
+ if (WARN_ON_ONCE(!s->sc_file->fi_deleg_file))
+ return NULL;
+ return get_file(s->sc_file->fi_deleg_file);
+ case NFS4_OPEN_STID:
+ case NFS4_LOCK_STID:
+ if (flags & RD_STATE)
+ return find_readable_file(s->sc_file);
+ else
+ return find_writeable_file(s->sc_file);
+ break;
+ }
+
+ return NULL;
+}
+
+static __be32
+nfs4_check_olstateid(struct svc_fh *fhp, struct nfs4_ol_stateid *ols, int flags)
+{
+ __be32 status;
+
+ status = nfsd4_check_openowner_confirmed(ols);
+ if (status)
+ return status;
+ return nfs4_check_openmode(ols, flags);
+}
+
+static __be32
+nfs4_check_file(struct svc_rqst *rqstp, struct svc_fh *fhp, struct nfs4_stid *s,
+ struct file **filpp, bool *tmp_file, int flags)
+{
+ int acc = (flags & RD_STATE) ? NFSD_MAY_READ : NFSD_MAY_WRITE;
+ struct file *file;
+ __be32 status;
+
+ file = nfs4_find_file(s, flags);
+ if (file) {
+ status = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry,
+ acc | NFSD_MAY_OWNER_OVERRIDE);
+ if (status) {
+ fput(file);
+ return status;
+ }
+
+ *filpp = file;
+ } else {
+ status = nfsd_open(rqstp, fhp, S_IFREG, acc, filpp);
+ if (status)
+ return status;
+
+ if (tmp_file)
+ *tmp_file = true;
+ }
+
+ return 0;
+}
+
+/*
+ * Checks for stateid operations
+ */
+__be32
+nfs4_preprocess_stateid_op(struct svc_rqst *rqstp,
+ struct nfsd4_compound_state *cstate, stateid_t *stateid,
+ int flags, struct file **filpp, bool *tmp_file)
+{
+ struct svc_fh *fhp = &cstate->current_fh;
+ struct inode *ino = d_inode(fhp->fh_dentry);
+ struct net *net = SVC_NET(rqstp);
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+ struct nfs4_stid *s = NULL;
+ __be32 status;
+
+ if (filpp)
+ *filpp = NULL;
+ if (tmp_file)
+ *tmp_file = false;
+
+ if (grace_disallows_io(net, ino))
+ return nfserr_grace;
+
+ if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
+ status = check_special_stateids(net, fhp, stateid, flags);
+ goto done;
+ }
+
+ status = nfsd4_lookup_stateid(cstate, stateid,
+ NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID,
+ &s, nn);
+ if (status)
+ return status;
+ status = check_stateid_generation(stateid, &s->sc_stateid,
+ nfsd4_has_session(cstate));
+ if (status)
+ goto out;
+
+ switch (s->sc_type) {
+ case NFS4_DELEG_STID:
+ status = nfs4_check_delegmode(delegstateid(s), flags);
+ break;
+ case NFS4_OPEN_STID:
+ case NFS4_LOCK_STID:
+ status = nfs4_check_olstateid(fhp, openlockstateid(s), flags);
+ break;
+ default:
+ status = nfserr_bad_stateid;
+ break;
+ }
+ if (status)
+ goto out;
+ status = nfs4_check_fh(fhp, s);
+
+done:
+ if (!status && filpp)
+ status = nfs4_check_file(rqstp, fhp, s, filpp, tmp_file, flags);
+out:
+ if (s)
+ nfs4_put_stid(s);
+ return status;
+}
+
+/*
+ * Test if the stateid is valid
+ */
+__be32
+nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
+ struct nfsd4_test_stateid *test_stateid)
+{
+ struct nfsd4_test_stateid_id *stateid;
+ struct nfs4_client *cl = cstate->session->se_client;
+
+ list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list)
+ stateid->ts_id_status =
+ nfsd4_validate_stateid(cl, &stateid->ts_id_stateid);
+
+ return nfs_ok;
+}
+
+static __be32
+nfsd4_free_lock_stateid(stateid_t *stateid, struct nfs4_stid *s)
+{
+ struct nfs4_ol_stateid *stp = openlockstateid(s);
+ __be32 ret;
+
+ mutex_lock(&stp->st_mutex);
+
+ ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
+ if (ret)
+ goto out;
+
+ ret = nfserr_locks_held;
+ if (check_for_locks(stp->st_stid.sc_file,
+ lockowner(stp->st_stateowner)))
+ goto out;
+
+ release_lock_stateid(stp);
+ ret = nfs_ok;
+
+out:
+ mutex_unlock(&stp->st_mutex);
+ nfs4_put_stid(s);
+ return ret;
+}
+
+__be32
+nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
+ struct nfsd4_free_stateid *free_stateid)
+{
+ stateid_t *stateid = &free_stateid->fr_stateid;
+ struct nfs4_stid *s;
+ struct nfs4_delegation *dp;
+ struct nfs4_client *cl = cstate->session->se_client;
+ __be32 ret = nfserr_bad_stateid;
+
+ spin_lock(&cl->cl_lock);
+ s = find_stateid_locked(cl, stateid);
+ if (!s)
+ goto out_unlock;
+ switch (s->sc_type) {
+ case NFS4_DELEG_STID:
+ ret = nfserr_locks_held;
+ break;
+ case NFS4_OPEN_STID:
+ ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
+ if (ret)
+ break;
+ ret = nfserr_locks_held;
+ break;
+ case NFS4_LOCK_STID:
+ atomic_inc(&s->sc_count);
+ spin_unlock(&cl->cl_lock);
+ ret = nfsd4_free_lock_stateid(stateid, s);
+ goto out;
+ case NFS4_REVOKED_DELEG_STID:
+ dp = delegstateid(s);
+ list_del_init(&dp->dl_recall_lru);
+ spin_unlock(&cl->cl_lock);
+ nfs4_put_stid(s);
+ ret = nfs_ok;
+ goto out;
+ /* Default falls through and returns nfserr_bad_stateid */
+ }
+out_unlock:
+ spin_unlock(&cl->cl_lock);
+out:
+ return ret;
+}
+
+static inline int
+setlkflg (int type)
+{
+ return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
+ RD_STATE : WR_STATE;
+}
+
+static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp)
+{
+ struct svc_fh *current_fh = &cstate->current_fh;
+ struct nfs4_stateowner *sop = stp->st_stateowner;
+ __be32 status;
+
+ status = nfsd4_check_seqid(cstate, sop, seqid);
+ if (status)
+ return status;
+ if (stp->st_stid.sc_type == NFS4_CLOSED_STID
+ || stp->st_stid.sc_type == NFS4_REVOKED_DELEG_STID)
+ /*
+ * "Closed" stateid's exist *only* to return
+ * nfserr_replay_me from the previous step, and
+ * revoked delegations are kept only for free_stateid.
+ */
+ return nfserr_bad_stateid;
+ mutex_lock(&stp->st_mutex);
+ status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
+ if (status == nfs_ok)
+ status = nfs4_check_fh(current_fh, &stp->st_stid);
+ if (status != nfs_ok)
+ mutex_unlock(&stp->st_mutex);
+ return status;
+}
+
+/*
+ * Checks for sequence id mutating operations.
+ */
+static __be32
+nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
+ stateid_t *stateid, char typemask,
+ struct nfs4_ol_stateid **stpp,
+ struct nfsd_net *nn)
+{
+ __be32 status;
+ struct nfs4_stid *s;
+ struct nfs4_ol_stateid *stp = NULL;
+
+ dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__,
+ seqid, STATEID_VAL(stateid));
+
+ *stpp = NULL;
+ status = nfsd4_lookup_stateid(cstate, stateid, typemask, &s, nn);
+ if (status)
+ return status;
+ stp = openlockstateid(s);
+ nfsd4_cstate_assign_replay(cstate, stp->st_stateowner);
+
+ status = nfs4_seqid_op_checks(cstate, stateid, seqid, stp);
+ if (!status)
+ *stpp = stp;
+ else
+ nfs4_put_stid(&stp->st_stid);
+ return status;
+}
+
+static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
+ stateid_t *stateid, struct nfs4_ol_stateid **stpp, struct nfsd_net *nn)
+{
+ __be32 status;
+ struct nfs4_openowner *oo;
+ struct nfs4_ol_stateid *stp;
+
+ status = nfs4_preprocess_seqid_op(cstate, seqid, stateid,
+ NFS4_OPEN_STID, &stp, nn);
+ if (status)
+ return status;
+ oo = openowner(stp->st_stateowner);
+ if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
+ mutex_unlock(&stp->st_mutex);
+ nfs4_put_stid(&stp->st_stid);
+ return nfserr_bad_stateid;
+ }
+ *stpp = stp;
+ return nfs_ok;
+}
+
+__be32
+nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
+ struct nfsd4_open_confirm *oc)
+{
+ __be32 status;
+ struct nfs4_openowner *oo;
+ struct nfs4_ol_stateid *stp;
+ struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
+
+ dprintk("NFSD: nfsd4_open_confirm on file %pd\n",
+ cstate->current_fh.fh_dentry);
+
+ status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
+ if (status)
+ return status;
+
+ status = nfs4_preprocess_seqid_op(cstate,
+ oc->oc_seqid, &oc->oc_req_stateid,
+ NFS4_OPEN_STID, &stp, nn);
+ if (status)
+ goto out;
+ oo = openowner(stp->st_stateowner);
+ status = nfserr_bad_stateid;
+ if (oo->oo_flags & NFS4_OO_CONFIRMED) {
+ mutex_unlock(&stp->st_mutex);
+ goto put_stateid;
+ }
+ oo->oo_flags |= NFS4_OO_CONFIRMED;
+ nfs4_inc_and_copy_stateid(&oc->oc_resp_stateid, &stp->st_stid);
+ mutex_unlock(&stp->st_mutex);
+ dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n",
+ __func__, oc->oc_seqid, STATEID_VAL(&stp->st_stid.sc_stateid));
+
+ nfsd4_client_record_create(oo->oo_owner.so_client);
+ status = nfs_ok;
+put_stateid:
+ nfs4_put_stid(&stp->st_stid);
+out:
+ nfsd4_bump_seqid(cstate, status);
+ return status;
+}
+
+static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access)
+{
+ if (!test_access(access, stp))
+ return;
+ nfs4_file_put_access(stp->st_stid.sc_file, access);
+ clear_access(access, stp);
+}
+
+static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access)
+{
+ switch (to_access) {
+ case NFS4_SHARE_ACCESS_READ:
+ nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE);
+ nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
+ break;
+ case NFS4_SHARE_ACCESS_WRITE:
+ nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ);
+ nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
+ break;
+ case NFS4_SHARE_ACCESS_BOTH:
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ }
+}
+
+__be32
+nfsd4_open_downgrade(struct svc_rqst *rqstp,
+ struct nfsd4_compound_state *cstate,
+ struct nfsd4_open_downgrade *od)
+{
+ __be32 status;
+ struct nfs4_ol_stateid *stp;
+ struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
+
+ dprintk("NFSD: nfsd4_open_downgrade on file %pd\n",
+ cstate->current_fh.fh_dentry);
+
+ /* We don't yet support WANT bits: */
+ if (od->od_deleg_want)
+ dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__,
+ od->od_deleg_want);
+
+ status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid,
+ &od->od_stateid, &stp, nn);
+ if (status)
+ goto out;
+ status = nfserr_inval;
+ if (!test_access(od->od_share_access, stp)) {
+ dprintk("NFSD: access not a subset of current bitmap: 0x%hhx, input access=%08x\n",
+ stp->st_access_bmap, od->od_share_access);
+ goto put_stateid;
+ }
+ if (!test_deny(od->od_share_deny, stp)) {
+ dprintk("NFSD: deny not a subset of current bitmap: 0x%hhx, input deny=%08x\n",
+ stp->st_deny_bmap, od->od_share_deny);
+ goto put_stateid;
+ }
+ nfs4_stateid_downgrade(stp, od->od_share_access);
+ reset_union_bmap_deny(od->od_share_deny, stp);
+ nfs4_inc_and_copy_stateid(&od->od_stateid, &stp->st_stid);
+ status = nfs_ok;
+put_stateid:
+ mutex_unlock(&stp->st_mutex);
+ nfs4_put_stid(&stp->st_stid);
+out:
+ nfsd4_bump_seqid(cstate, status);
+ return status;
+}
+
+static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)
+{
+ struct nfs4_client *clp = s->st_stid.sc_client;
+ bool unhashed;
+ LIST_HEAD(reaplist);
+
+ s->st_stid.sc_type = NFS4_CLOSED_STID;
+ spin_lock(&clp->cl_lock);
+ unhashed = unhash_open_stateid(s, &reaplist);
+
+ if (clp->cl_minorversion) {
+ if (unhashed)
+ put_ol_stateid_locked(s, &reaplist);
+ spin_unlock(&clp->cl_lock);
+ free_ol_stateid_reaplist(&reaplist);
+ } else {
+ spin_unlock(&clp->cl_lock);
+ free_ol_stateid_reaplist(&reaplist);
+ if (unhashed)
+ move_to_close_lru(s, clp->net);
+ }
+}
+
+/*
+ * nfs4_unlock_state() called after encode
+ */
+__be32
+nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
+ struct nfsd4_close *close)
+{
+ __be32 status;
+ struct nfs4_ol_stateid *stp;
+ struct net *net = SVC_NET(rqstp);
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+
+ dprintk("NFSD: nfsd4_close on file %pd\n",
+ cstate->current_fh.fh_dentry);
+
+ status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid,
+ &close->cl_stateid,
+ NFS4_OPEN_STID|NFS4_CLOSED_STID,
+ &stp, nn);
+ nfsd4_bump_seqid(cstate, status);
+ if (status)
+ goto out;
+ nfs4_inc_and_copy_stateid(&close->cl_stateid, &stp->st_stid);
+ mutex_unlock(&stp->st_mutex);
+
+ nfsd4_close_open_stateid(stp);
+
+ /* put reference from nfs4_preprocess_seqid_op */
+ nfs4_put_stid(&stp->st_stid);
+out:
+ return status;
+}
+
+__be32
+nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
+ struct nfsd4_delegreturn *dr)
+{
+ struct nfs4_delegation *dp;
+ stateid_t *stateid = &dr->dr_stateid;
+ struct nfs4_stid *s;
+ __be32 status;
+ struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
+
+ if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
+ return status;
+
+ status = nfsd4_lookup_stateid(cstate, stateid, NFS4_DELEG_STID, &s, nn);
+ if (status)
+ goto out;
+ dp = delegstateid(s);
+ status = check_stateid_generation(stateid, &dp->dl_stid.sc_stateid, nfsd4_has_session(cstate));
+ if (status)
+ goto put_stateid;
+
+ destroy_delegation(dp);
+put_stateid:
+ nfs4_put_stid(&dp->dl_stid);
+out:
+ return status;
+}
+
+static inline u64
+end_offset(u64 start, u64 len)
+{
+ u64 end;
+
+ end = start + len;
+ return end >= start ? end: NFS4_MAX_UINT64;
+}
+
+/* last octet in a range */
+static inline u64
+last_byte_offset(u64 start, u64 len)
+{
+ u64 end;
+
+ WARN_ON_ONCE(!len);
+ end = start + len;
+ return end > start ? end - 1: NFS4_MAX_UINT64;
+}
+
+/*
+ * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
+ * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
+ * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
+ * locking, this prevents us from being completely protocol-compliant. The
+ * real solution to this problem is to start using unsigned file offsets in
+ * the VFS, but this is a very deep change!
+ */
+static inline void
+nfs4_transform_lock_offset(struct file_lock *lock)
+{
+ if (lock->fl_start < 0)
+ lock->fl_start = OFFSET_MAX;
+ if (lock->fl_end < 0)
+ lock->fl_end = OFFSET_MAX;
+}
+
+static fl_owner_t
+nfsd4_fl_get_owner(fl_owner_t owner)
+{
+ struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
+
+ nfs4_get_stateowner(&lo->lo_owner);
+ return owner;
+}
+
+static void
+nfsd4_fl_put_owner(fl_owner_t owner)
+{
+ struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
+
+ if (lo)
+ nfs4_put_stateowner(&lo->lo_owner);
+}
+
+static const struct lock_manager_operations nfsd_posix_mng_ops = {
+ .lm_get_owner = nfsd4_fl_get_owner,
+ .lm_put_owner = nfsd4_fl_put_owner,
+};
+
+static inline void
+nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
+{
+ struct nfs4_lockowner *lo;
+
+ if (fl->fl_lmops == &nfsd_posix_mng_ops) {
+ lo = (struct nfs4_lockowner *) fl->fl_owner;
+ deny->ld_owner.data = kmemdup(lo->lo_owner.so_owner.data,
+ lo->lo_owner.so_owner.len, GFP_KERNEL);
+ if (!deny->ld_owner.data)
+ /* We just don't care that much */
+ goto nevermind;
+ deny->ld_owner.len = lo->lo_owner.so_owner.len;
+ deny->ld_clientid = lo->lo_owner.so_client->cl_clientid;
+ } else {
+nevermind:
+ deny->ld_owner.len = 0;
+ deny->ld_owner.data = NULL;
+ deny->ld_clientid.cl_boot = 0;
+ deny->ld_clientid.cl_id = 0;
+ }
+ deny->ld_start = fl->fl_start;
+ deny->ld_length = NFS4_MAX_UINT64;
+ if (fl->fl_end != NFS4_MAX_UINT64)
+ deny->ld_length = fl->fl_end - fl->fl_start + 1;
+ deny->ld_type = NFS4_READ_LT;
+ if (fl->fl_type != F_RDLCK)
+ deny->ld_type = NFS4_WRITE_LT;
+}
+
+static struct nfs4_lockowner *
+find_lockowner_str_locked(struct nfs4_client *clp, struct xdr_netobj *owner)
+{
+ unsigned int strhashval = ownerstr_hashval(owner);
+ struct nfs4_stateowner *so;
+
+ lockdep_assert_held(&clp->cl_lock);
+
+ list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[strhashval],
+ so_strhash) {
+ if (so->so_is_open_owner)
+ continue;
+ if (same_owner_str(so, owner))
+ return lockowner(nfs4_get_stateowner(so));
+ }
+ return NULL;
+}
+
+static struct nfs4_lockowner *
+find_lockowner_str(struct nfs4_client *clp, struct xdr_netobj *owner)
+{
+ struct nfs4_lockowner *lo;
+
+ spin_lock(&clp->cl_lock);
+ lo = find_lockowner_str_locked(clp, owner);
+ spin_unlock(&clp->cl_lock);
+ return lo;
+}
+
+static void nfs4_unhash_lockowner(struct nfs4_stateowner *sop)
+{
+ unhash_lockowner_locked(lockowner(sop));
+}
+
+static void nfs4_free_lockowner(struct nfs4_stateowner *sop)
+{
+ struct nfs4_lockowner *lo = lockowner(sop);
+
+ kmem_cache_free(lockowner_slab, lo);
+}
+
+static const struct nfs4_stateowner_operations lockowner_ops = {
+ .so_unhash = nfs4_unhash_lockowner,
+ .so_free = nfs4_free_lockowner,
+};
+
+/*
+ * Alloc a lock owner structure.
+ * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
+ * occurred.
+ *
+ * strhashval = ownerstr_hashval
+ */
+static struct nfs4_lockowner *
+alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp,
+ struct nfs4_ol_stateid *open_stp,
+ struct nfsd4_lock *lock)
+{
+ struct nfs4_lockowner *lo, *ret;
+
+ lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp);
+ if (!lo)
+ return NULL;
+ INIT_LIST_HEAD(&lo->lo_owner.so_stateids);
+ lo->lo_owner.so_is_open_owner = 0;
+ lo->lo_owner.so_seqid = lock->lk_new_lock_seqid;
+ lo->lo_owner.so_ops = &lockowner_ops;
+ spin_lock(&clp->cl_lock);
+ ret = find_lockowner_str_locked(clp, &lock->lk_new_owner);
+ if (ret == NULL) {
+ list_add(&lo->lo_owner.so_strhash,
+ &clp->cl_ownerstr_hashtbl[strhashval]);
+ ret = lo;
+ } else
+ nfs4_free_stateowner(&lo->lo_owner);
+
+ spin_unlock(&clp->cl_lock);
+ return ret;
+}
+
+static void
+init_lock_stateid(struct nfs4_ol_stateid *stp, struct nfs4_lockowner *lo,
+ struct nfs4_file *fp, struct inode *inode,
+ struct nfs4_ol_stateid *open_stp)
+{
+ struct nfs4_client *clp = lo->lo_owner.so_client;
+
+ lockdep_assert_held(&clp->cl_lock);
+
+ atomic_inc(&stp->st_stid.sc_count);
+ stp->st_stid.sc_type = NFS4_LOCK_STID;
+ stp->st_stateowner = nfs4_get_stateowner(&lo->lo_owner);
+ get_nfs4_file(fp);
+ stp->st_stid.sc_file = fp;
+ stp->st_access_bmap = 0;
+ stp->st_deny_bmap = open_stp->st_deny_bmap;
+ stp->st_openstp = open_stp;
+ mutex_init(&stp->st_mutex);
+ list_add(&stp->st_locks, &open_stp->st_locks);
+ list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
+ spin_lock(&fp->fi_lock);
+ list_add(&stp->st_perfile, &fp->fi_stateids);
+ spin_unlock(&fp->fi_lock);
+}
+
+static struct nfs4_ol_stateid *
+find_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fp)
+{
+ struct nfs4_ol_stateid *lst;
+ struct nfs4_client *clp = lo->lo_owner.so_client;
+
+ lockdep_assert_held(&clp->cl_lock);
+
+ list_for_each_entry(lst, &lo->lo_owner.so_stateids, st_perstateowner) {
+ if (lst->st_stid.sc_file == fp) {
+ atomic_inc(&lst->st_stid.sc_count);
+ return lst;
+ }
+ }
+ return NULL;
+}
+
+static struct nfs4_ol_stateid *
+find_or_create_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fi,
+ struct inode *inode, struct nfs4_ol_stateid *ost,
+ bool *new)
+{
+ struct nfs4_stid *ns = NULL;
+ struct nfs4_ol_stateid *lst;
+ struct nfs4_openowner *oo = openowner(ost->st_stateowner);
+ struct nfs4_client *clp = oo->oo_owner.so_client;
+
+ spin_lock(&clp->cl_lock);
+ lst = find_lock_stateid(lo, fi);
+ if (lst == NULL) {
+ spin_unlock(&clp->cl_lock);
+ ns = nfs4_alloc_stid(clp, stateid_slab, nfs4_free_lock_stateid);
+ if (ns == NULL)
+ return NULL;
+
+ spin_lock(&clp->cl_lock);
+ lst = find_lock_stateid(lo, fi);
+ if (likely(!lst)) {
+ lst = openlockstateid(ns);
+ init_lock_stateid(lst, lo, fi, inode, ost);
+ ns = NULL;
+ *new = true;
+ }
+ }
+ spin_unlock(&clp->cl_lock);
+ if (ns)
+ nfs4_put_stid(ns);
+ return lst;
+}
+
+static int
+check_lock_length(u64 offset, u64 length)
+{
+ return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
+ (length > ~offset)));
+}
+
+static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access)
+{
+ struct nfs4_file *fp = lock_stp->st_stid.sc_file;
+
+ lockdep_assert_held(&fp->fi_lock);
+
+ if (test_access(access, lock_stp))
+ return;
+ __nfs4_file_get_access(fp, access);
+ set_access(access, lock_stp);
+}
+
+static __be32
+lookup_or_create_lock_state(struct nfsd4_compound_state *cstate,
+ struct nfs4_ol_stateid *ost,
+ struct nfsd4_lock *lock,
+ struct nfs4_ol_stateid **plst, bool *new)
+{
+ __be32 status;
+ struct nfs4_file *fi = ost->st_stid.sc_file;
+ struct nfs4_openowner *oo = openowner(ost->st_stateowner);
+ struct nfs4_client *cl = oo->oo_owner.so_client;
+ struct inode *inode = d_inode(cstate->current_fh.fh_dentry);
+ struct nfs4_lockowner *lo;
+ struct nfs4_ol_stateid *lst;
+ unsigned int strhashval;
+ bool hashed;
+
+ lo = find_lockowner_str(cl, &lock->lk_new_owner);
+ if (!lo) {
+ strhashval = ownerstr_hashval(&lock->lk_new_owner);
+ lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock);
+ if (lo == NULL)
+ return nfserr_jukebox;
+ } else {
+ /* with an existing lockowner, seqids must be the same */
+ status = nfserr_bad_seqid;
+ if (!cstate->minorversion &&
+ lock->lk_new_lock_seqid != lo->lo_owner.so_seqid)
+ goto out;
+ }
+
+retry:
+ lst = find_or_create_lock_stateid(lo, fi, inode, ost, new);
+ if (lst == NULL) {
+ status = nfserr_jukebox;
+ goto out;
+ }
+
+ mutex_lock(&lst->st_mutex);
+
+ /* See if it's still hashed to avoid race with FREE_STATEID */
+ spin_lock(&cl->cl_lock);
+ hashed = !list_empty(&lst->st_perfile);
+ spin_unlock(&cl->cl_lock);
+
+ if (!hashed) {
+ mutex_unlock(&lst->st_mutex);
+ nfs4_put_stid(&lst->st_stid);
+ goto retry;
+ }
+ status = nfs_ok;
+ *plst = lst;
+out:
+ nfs4_put_stateowner(&lo->lo_owner);
+ return status;
+}
+
+/*
+ * LOCK operation
+ */
+__be32
+nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
+ struct nfsd4_lock *lock)
+{
+ struct nfs4_openowner *open_sop = NULL;
+ struct nfs4_lockowner *lock_sop = NULL;
+ struct nfs4_ol_stateid *lock_stp = NULL;
+ struct nfs4_ol_stateid *open_stp = NULL;
+ struct nfs4_file *fp;
+ struct file *filp = NULL;
+ struct file_lock *file_lock = NULL;
+ struct file_lock *conflock = NULL;
+ __be32 status = 0;
+ int lkflg;
+ int err;
+ bool new = false;
+ struct net *net = SVC_NET(rqstp);
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+
+ dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
+ (long long) lock->lk_offset,
+ (long long) lock->lk_length);
+
+ if (check_lock_length(lock->lk_offset, lock->lk_length))
+ return nfserr_inval;
+
+ if ((status = fh_verify(rqstp, &cstate->current_fh,
+ S_IFREG, NFSD_MAY_LOCK))) {
+ dprintk("NFSD: nfsd4_lock: permission denied!\n");
+ return status;
+ }
+
+ if (lock->lk_is_new) {
+ if (nfsd4_has_session(cstate))
+ /* See rfc 5661 18.10.3: given clientid is ignored: */
+ memcpy(&lock->lk_new_clientid,
+ &cstate->session->se_client->cl_clientid,
+ sizeof(clientid_t));
+
+ status = nfserr_stale_clientid;
+ if (STALE_CLIENTID(&lock->lk_new_clientid, nn))
+ goto out;
+
+ /* validate and update open stateid and open seqid */
+ status = nfs4_preprocess_confirmed_seqid_op(cstate,
+ lock->lk_new_open_seqid,
+ &lock->lk_new_open_stateid,
+ &open_stp, nn);
+ if (status)
+ goto out;
+ mutex_unlock(&open_stp->st_mutex);
+ open_sop = openowner(open_stp->st_stateowner);
+ status = nfserr_bad_stateid;
+ if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
+ &lock->lk_new_clientid))
+ goto out;
+ status = lookup_or_create_lock_state(cstate, open_stp, lock,
+ &lock_stp, &new);
+ } else {
+ status = nfs4_preprocess_seqid_op(cstate,
+ lock->lk_old_lock_seqid,
+ &lock->lk_old_lock_stateid,
+ NFS4_LOCK_STID, &lock_stp, nn);
+ }
+ if (status)
+ goto out;
+ lock_sop = lockowner(lock_stp->st_stateowner);
+
+ lkflg = setlkflg(lock->lk_type);
+ status = nfs4_check_openmode(lock_stp, lkflg);
+ if (status)
+ goto out;
+
+ status = nfserr_grace;
+ if (locks_in_grace(net) && !lock->lk_reclaim)
+ goto out;
+ status = nfserr_no_grace;
+ if (!locks_in_grace(net) && lock->lk_reclaim)
+ goto out;
+
+ file_lock = locks_alloc_lock();
+ if (!file_lock) {
+ dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
+ status = nfserr_jukebox;
+ goto out;
+ }
+
+ fp = lock_stp->st_stid.sc_file;
+ switch (lock->lk_type) {
+ case NFS4_READ_LT:
+ case NFS4_READW_LT:
+ spin_lock(&fp->fi_lock);
+ filp = find_readable_file_locked(fp);
+ if (filp)
+ get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
+ spin_unlock(&fp->fi_lock);
+ file_lock->fl_type = F_RDLCK;
+ break;
+ case NFS4_WRITE_LT:
+ case NFS4_WRITEW_LT:
+ spin_lock(&fp->fi_lock);
+ filp = find_writeable_file_locked(fp);
+ if (filp)
+ get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
+ spin_unlock(&fp->fi_lock);
+ file_lock->fl_type = F_WRLCK;
+ break;
+ default:
+ status = nfserr_inval;
+ goto out;
+ }
+ if (!filp) {
+ status = nfserr_openmode;
+ goto out;
+ }
+
+ file_lock->fl_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(&lock_sop->lo_owner));
+ file_lock->fl_pid = current->tgid;
+ file_lock->fl_file = filp;
+ file_lock->fl_flags = FL_POSIX;
+ file_lock->fl_lmops = &nfsd_posix_mng_ops;
+ file_lock->fl_start = lock->lk_offset;
+ file_lock->fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
+ nfs4_transform_lock_offset(file_lock);
+
+ conflock = locks_alloc_lock();
+ if (!conflock) {
+ dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
+ status = nfserr_jukebox;
+ goto out;
+ }
+
+ err = vfs_lock_file(filp, F_SETLK, file_lock, conflock);
+ switch (-err) {
+ case 0: /* success! */
+ nfs4_inc_and_copy_stateid(&lock->lk_resp_stateid, &lock_stp->st_stid);
+ status = 0;
+ break;
+ case (EAGAIN): /* conflock holds conflicting lock */
+ status = nfserr_denied;
+ dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
+ nfs4_set_lock_denied(conflock, &lock->lk_denied);
+ break;
+ case (EDEADLK):
+ status = nfserr_deadlock;
+ break;
+ default:
+ dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
+ status = nfserrno(err);
+ break;
+ }
+out:
+ if (filp)
+ fput(filp);
+ if (lock_stp) {
+ /* Bump seqid manually if the 4.0 replay owner is openowner */
+ if (cstate->replay_owner &&
+ cstate->replay_owner != &lock_sop->lo_owner &&
+ seqid_mutating_err(ntohl(status)))
+ lock_sop->lo_owner.so_seqid++;
+
+ mutex_unlock(&lock_stp->st_mutex);
+
+ /*
+ * If this is a new, never-before-used stateid, and we are
+ * returning an error, then just go ahead and release it.
+ */
+ if (status && new)
+ release_lock_stateid(lock_stp);
+
+ nfs4_put_stid(&lock_stp->st_stid);
+ }
+ if (open_stp)
+ nfs4_put_stid(&open_stp->st_stid);
+ nfsd4_bump_seqid(cstate, status);
+ if (file_lock)
+ locks_free_lock(file_lock);
+ if (conflock)
+ locks_free_lock(conflock);
+ return status;
+}
+
+/*
+ * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
+ * so we do a temporary open here just to get an open file to pass to
+ * vfs_test_lock. (Arguably perhaps test_lock should be done with an
+ * inode operation.)
+ */
+static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
+{
+ struct file *file;
+ __be32 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
+ if (!err) {
+ err = nfserrno(vfs_test_lock(file, lock));
+ fput(file);
+ }
+ return err;
+}
+
+/*
+ * LOCKT operation
+ */
+__be32
+nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
+ struct nfsd4_lockt *lockt)
+{
+ struct file_lock *file_lock = NULL;
+ struct nfs4_lockowner *lo = NULL;
+ __be32 status;
+ struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
+
+ if (locks_in_grace(SVC_NET(rqstp)))
+ return nfserr_grace;
+
+ if (check_lock_length(lockt->lt_offset, lockt->lt_length))
+ return nfserr_inval;
+
+ if (!nfsd4_has_session(cstate)) {
+ status = lookup_clientid(&lockt->lt_clientid, cstate, nn);
+ if (status)
+ goto out;
+ }
+
+ if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
+ goto out;
+
+ file_lock = locks_alloc_lock();
+ if (!file_lock) {
+ dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
+ status = nfserr_jukebox;
+ goto out;
+ }
+
+ switch (lockt->lt_type) {
+ case NFS4_READ_LT:
+ case NFS4_READW_LT:
+ file_lock->fl_type = F_RDLCK;
+ break;
+ case NFS4_WRITE_LT:
+ case NFS4_WRITEW_LT:
+ file_lock->fl_type = F_WRLCK;
+ break;
+ default:
+ dprintk("NFSD: nfs4_lockt: bad lock type!\n");
+ status = nfserr_inval;
+ goto out;
+ }
+
+ lo = find_lockowner_str(cstate->clp, &lockt->lt_owner);
+ if (lo)
+ file_lock->fl_owner = (fl_owner_t)lo;
+ file_lock->fl_pid = current->tgid;
+ file_lock->fl_flags = FL_POSIX;
+
+ file_lock->fl_start = lockt->lt_offset;
+ file_lock->fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
+
+ nfs4_transform_lock_offset(file_lock);
+
+ status = nfsd_test_lock(rqstp, &cstate->current_fh, file_lock);
+ if (status)
+ goto out;
+
+ if (file_lock->fl_type != F_UNLCK) {
+ status = nfserr_denied;
+ nfs4_set_lock_denied(file_lock, &lockt->lt_denied);
+ }
+out:
+ if (lo)
+ nfs4_put_stateowner(&lo->lo_owner);
+ if (file_lock)
+ locks_free_lock(file_lock);
+ return status;
+}
+
+__be32
+nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
+ struct nfsd4_locku *locku)
+{
+ struct nfs4_ol_stateid *stp;
+ struct file *filp = NULL;
+ struct file_lock *file_lock = NULL;
+ __be32 status;
+ int err;
+ struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
+
+ dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
+ (long long) locku->lu_offset,
+ (long long) locku->lu_length);
+
+ if (check_lock_length(locku->lu_offset, locku->lu_length))
+ return nfserr_inval;
+
+ status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid,
+ &locku->lu_stateid, NFS4_LOCK_STID,
+ &stp, nn);
+ if (status)
+ goto out;
+ filp = find_any_file(stp->st_stid.sc_file);
+ if (!filp) {
+ status = nfserr_lock_range;
+ goto put_stateid;
+ }
+ file_lock = locks_alloc_lock();
+ if (!file_lock) {
+ dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
+ status = nfserr_jukebox;
+ goto fput;
+ }
+
+ file_lock->fl_type = F_UNLCK;
+ file_lock->fl_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(stp->st_stateowner));
+ file_lock->fl_pid = current->tgid;
+ file_lock->fl_file = filp;
+ file_lock->fl_flags = FL_POSIX;
+ file_lock->fl_lmops = &nfsd_posix_mng_ops;
+ file_lock->fl_start = locku->lu_offset;
+
+ file_lock->fl_end = last_byte_offset(locku->lu_offset,
+ locku->lu_length);
+ nfs4_transform_lock_offset(file_lock);
+
+ err = vfs_lock_file(filp, F_SETLK, file_lock, NULL);
+ if (err) {
+ dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
+ goto out_nfserr;
+ }
+ nfs4_inc_and_copy_stateid(&locku->lu_stateid, &stp->st_stid);
+fput:
+ fput(filp);
+put_stateid:
+ mutex_unlock(&stp->st_mutex);
+ nfs4_put_stid(&stp->st_stid);
+out:
+ nfsd4_bump_seqid(cstate, status);
+ if (file_lock)
+ locks_free_lock(file_lock);
+ return status;
+
+out_nfserr:
+ status = nfserrno(err);
+ goto fput;
+}
+
+/*
+ * returns
+ * true: locks held by lockowner
+ * false: no locks held by lockowner
+ */
+static bool
+check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner)
+{
+ struct file_lock *fl;
+ int status = false;
+ struct file *filp = find_any_file(fp);
+ struct inode *inode;
+ struct file_lock_context *flctx;
+
+ if (!filp) {
+ /* Any valid lock stateid should have some sort of access */
+ WARN_ON_ONCE(1);
+ return status;
+ }
+
+ inode = file_inode(filp);
+ flctx = inode->i_flctx;
+
+ if (flctx && !list_empty_careful(&flctx->flc_posix)) {
+ spin_lock(&flctx->flc_lock);
+ list_for_each_entry(fl, &flctx->flc_posix, fl_list) {
+ if (fl->fl_owner == (fl_owner_t)lowner) {
+ status = true;
+ break;
+ }
+ }
+ spin_unlock(&flctx->flc_lock);
+ }
+ fput(filp);
+ return status;
+}
+
+__be32
+nfsd4_release_lockowner(struct svc_rqst *rqstp,
+ struct nfsd4_compound_state *cstate,
+ struct nfsd4_release_lockowner *rlockowner)
+{
+ clientid_t *clid = &rlockowner->rl_clientid;
+ struct nfs4_stateowner *sop;
+ struct nfs4_lockowner *lo = NULL;
+ struct nfs4_ol_stateid *stp;
+ struct xdr_netobj *owner = &rlockowner->rl_owner;
+ unsigned int hashval = ownerstr_hashval(owner);
+ __be32 status;
+ struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
+ struct nfs4_client *clp;
+ LIST_HEAD (reaplist);
+
+ dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
+ clid->cl_boot, clid->cl_id);
+
+ status = lookup_clientid(clid, cstate, nn);
+ if (status)
+ return status;
+
+ clp = cstate->clp;
+ /* Find the matching lock stateowner */
+ spin_lock(&clp->cl_lock);
+ list_for_each_entry(sop, &clp->cl_ownerstr_hashtbl[hashval],
+ so_strhash) {
+
+ if (sop->so_is_open_owner || !same_owner_str(sop, owner))
+ continue;
+
+ /* see if there are still any locks associated with it */
+ lo = lockowner(sop);
+ list_for_each_entry(stp, &sop->so_stateids, st_perstateowner) {
+ if (check_for_locks(stp->st_stid.sc_file, lo)) {
+ status = nfserr_locks_held;
+ spin_unlock(&clp->cl_lock);
+ return status;
+ }
+ }
+
+ nfs4_get_stateowner(sop);
+ break;
+ }
+ if (!lo) {
+ spin_unlock(&clp->cl_lock);
+ return status;
+ }
+
+ unhash_lockowner_locked(lo);
+ while (!list_empty(&lo->lo_owner.so_stateids)) {
+ stp = list_first_entry(&lo->lo_owner.so_stateids,
+ struct nfs4_ol_stateid,
+ st_perstateowner);
+ WARN_ON(!unhash_lock_stateid(stp));
+ put_ol_stateid_locked(stp, &reaplist);
+ }
+ spin_unlock(&clp->cl_lock);
+ free_ol_stateid_reaplist(&reaplist);
+ nfs4_put_stateowner(&lo->lo_owner);
+
+ return status;
+}
+
+static inline struct nfs4_client_reclaim *
+alloc_reclaim(void)
+{
+ return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
+}
+
+bool
+nfs4_has_reclaimed_state(const char *name, struct nfsd_net *nn)
+{
+ struct nfs4_client_reclaim *crp;
+
+ crp = nfsd4_find_reclaim_client(name, nn);
+ return (crp && crp->cr_clp);
+}
+
+/*
+ * failure => all reset bets are off, nfserr_no_grace...
+ */
+struct nfs4_client_reclaim *
+nfs4_client_to_reclaim(const char *name, struct nfsd_net *nn)
+{
+ unsigned int strhashval;
+ struct nfs4_client_reclaim *crp;
+
+ dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
+ crp = alloc_reclaim();
+ if (crp) {
+ strhashval = clientstr_hashval(name);
+ INIT_LIST_HEAD(&crp->cr_strhash);
+ list_add(&crp->cr_strhash, &nn->reclaim_str_hashtbl[strhashval]);
+ memcpy(crp->cr_recdir, name, HEXDIR_LEN);
+ crp->cr_clp = NULL;
+ nn->reclaim_str_hashtbl_size++;
+ }
+ return crp;
+}
+
+void
+nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp, struct nfsd_net *nn)
+{
+ list_del(&crp->cr_strhash);
+ kfree(crp);
+ nn->reclaim_str_hashtbl_size--;
+}
+
+void
+nfs4_release_reclaim(struct nfsd_net *nn)
+{
+ struct nfs4_client_reclaim *crp = NULL;
+ int i;
+
+ for (i = 0; i < CLIENT_HASH_SIZE; i++) {
+ while (!list_empty(&nn->reclaim_str_hashtbl[i])) {
+ crp = list_entry(nn->reclaim_str_hashtbl[i].next,
+ struct nfs4_client_reclaim, cr_strhash);
+ nfs4_remove_reclaim_record(crp, nn);
+ }
+ }
+ WARN_ON_ONCE(nn->reclaim_str_hashtbl_size);
+}
+
+/*
+ * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
+struct nfs4_client_reclaim *
+nfsd4_find_reclaim_client(const char *recdir, struct nfsd_net *nn)
+{
+ unsigned int strhashval;
+ struct nfs4_client_reclaim *crp = NULL;
+
+ dprintk("NFSD: nfs4_find_reclaim_client for recdir %s\n", recdir);
+
+ strhashval = clientstr_hashval(recdir);
+ list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) {
+ if (same_name(crp->cr_recdir, recdir)) {
+ return crp;
+ }
+ }
+ return NULL;
+}
+
+/*
+* Called from OPEN. Look for clientid in reclaim list.
+*/
+__be32
+nfs4_check_open_reclaim(clientid_t *clid,
+ struct nfsd4_compound_state *cstate,
+ struct nfsd_net *nn)
+{
+ __be32 status;
+
+ /* find clientid in conf_id_hashtbl */
+ status = lookup_clientid(clid, cstate, nn);
+ if (status)
+ return nfserr_reclaim_bad;
+
+ if (test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &cstate->clp->cl_flags))
+ return nfserr_no_grace;
+
+ if (nfsd4_client_record_check(cstate->clp))
+ return nfserr_reclaim_bad;
+
+ return nfs_ok;
+}
+
+#ifdef CONFIG_NFSD_FAULT_INJECTION
+static inline void
+put_client(struct nfs4_client *clp)
+{
+ atomic_dec(&clp->cl_refcount);
+}
+
+static struct nfs4_client *
+nfsd_find_client(struct sockaddr_storage *addr, size_t addr_size)
+{
+ struct nfs4_client *clp;
+ struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
+ nfsd_net_id);
+
+ if (!nfsd_netns_ready(nn))
+ return NULL;
+
+ list_for_each_entry(clp, &nn->client_lru, cl_lru) {
+ if (memcmp(&clp->cl_addr, addr, addr_size) == 0)
+ return clp;
+ }
+ return NULL;
+}
+
+u64
+nfsd_inject_print_clients(void)
+{
+ struct nfs4_client *clp;
+ u64 count = 0;
+ struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
+ nfsd_net_id);
+ char buf[INET6_ADDRSTRLEN];
+
+ if (!nfsd_netns_ready(nn))
+ return 0;
+
+ spin_lock(&nn->client_lock);
+ list_for_each_entry(clp, &nn->client_lru, cl_lru) {
+ rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf));
+ pr_info("NFS Client: %s\n", buf);
+ ++count;
+ }
+ spin_unlock(&nn->client_lock);
+
+ return count;
+}
+
+u64
+nfsd_inject_forget_client(struct sockaddr_storage *addr, size_t addr_size)
+{
+ u64 count = 0;
+ struct nfs4_client *clp;
+ struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
+ nfsd_net_id);
+
+ if (!nfsd_netns_ready(nn))
+ return count;
+
+ spin_lock(&nn->client_lock);
+ clp = nfsd_find_client(addr, addr_size);
+ if (clp) {
+ if (mark_client_expired_locked(clp) == nfs_ok)
+ ++count;
+ else
+ clp = NULL;
+ }
+ spin_unlock(&nn->client_lock);
+
+ if (clp)
+ expire_client(clp);
+
+ return count;
+}
+
+u64
+nfsd_inject_forget_clients(u64 max)
+{
+ u64 count = 0;
+ struct nfs4_client *clp, *next;
+ struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
+ nfsd_net_id);
+ LIST_HEAD(reaplist);
+
+ if (!nfsd_netns_ready(nn))
+ return count;
+
+ spin_lock(&nn->client_lock);
+ list_for_each_entry_safe(clp, next, &nn->client_lru, cl_lru) {
+ if (mark_client_expired_locked(clp) == nfs_ok) {
+ list_add(&clp->cl_lru, &reaplist);
+ if (max != 0 && ++count >= max)
+ break;
+ }
+ }
+ spin_unlock(&nn->client_lock);
+
+ list_for_each_entry_safe(clp, next, &reaplist, cl_lru)
+ expire_client(clp);
+
+ return count;
+}
+
+static void nfsd_print_count(struct nfs4_client *clp, unsigned int count,
+ const char *type)
+{
+ char buf[INET6_ADDRSTRLEN];
+ rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf));
+ printk(KERN_INFO "NFS Client: %s has %u %s\n", buf, count, type);
+}
+
+static void
+nfsd_inject_add_lock_to_list(struct nfs4_ol_stateid *lst,
+ struct list_head *collect)
+{
+ struct nfs4_client *clp = lst->st_stid.sc_client;
+ struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
+ nfsd_net_id);
+
+ if (!collect)
+ return;
+
+ lockdep_assert_held(&nn->client_lock);
+ atomic_inc(&clp->cl_refcount);
+ list_add(&lst->st_locks, collect);
+}
+
+static u64 nfsd_foreach_client_lock(struct nfs4_client *clp, u64 max,
+ struct list_head *collect,
+ bool (*func)(struct nfs4_ol_stateid *))
+{
+ struct nfs4_openowner *oop;
+ struct nfs4_ol_stateid *stp, *st_next;
+ struct nfs4_ol_stateid *lst, *lst_next;
+ u64 count = 0;
+
+ spin_lock(&clp->cl_lock);
+ list_for_each_entry(oop, &clp->cl_openowners, oo_perclient) {
+ list_for_each_entry_safe(stp, st_next,
+ &oop->oo_owner.so_stateids, st_perstateowner) {
+ list_for_each_entry_safe(lst, lst_next,
+ &stp->st_locks, st_locks) {
+ if (func) {
+ if (func(lst))
+ nfsd_inject_add_lock_to_list(lst,
+ collect);
+ }
+ ++count;
+ /*
+ * Despite the fact that these functions deal
+ * with 64-bit integers for "count", we must
+ * ensure that it doesn't blow up the
+ * clp->cl_refcount. Throw a warning if we
+ * start to approach INT_MAX here.
+ */
+ WARN_ON_ONCE(count == (INT_MAX / 2));
+ if (count == max)
+ goto out;
+ }
+ }
+ }
+out:
+ spin_unlock(&clp->cl_lock);
+
+ return count;
+}
+
+static u64
+nfsd_collect_client_locks(struct nfs4_client *clp, struct list_head *collect,
+ u64 max)
+{
+ return nfsd_foreach_client_lock(clp, max, collect, unhash_lock_stateid);
+}
+
+static u64
+nfsd_print_client_locks(struct nfs4_client *clp)
+{
+ u64 count = nfsd_foreach_client_lock(clp, 0, NULL, NULL);
+ nfsd_print_count(clp, count, "locked files");
+ return count;
+}
+
+u64
+nfsd_inject_print_locks(void)
+{
+ struct nfs4_client *clp;
+ u64 count = 0;
+ struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
+ nfsd_net_id);
+
+ if (!nfsd_netns_ready(nn))
+ return 0;
+
+ spin_lock(&nn->client_lock);
+ list_for_each_entry(clp, &nn->client_lru, cl_lru)
+ count += nfsd_print_client_locks(clp);
+ spin_unlock(&nn->client_lock);
+
+ return count;
+}
+
+static void
+nfsd_reap_locks(struct list_head *reaplist)
+{
+ struct nfs4_client *clp;
+ struct nfs4_ol_stateid *stp, *next;
+
+ list_for_each_entry_safe(stp, next, reaplist, st_locks) {
+ list_del_init(&stp->st_locks);
+ clp = stp->st_stid.sc_client;
+ nfs4_put_stid(&stp->st_stid);
+ put_client(clp);
+ }
+}
+
+u64
+nfsd_inject_forget_client_locks(struct sockaddr_storage *addr, size_t addr_size)
+{
+ unsigned int count = 0;
+ struct nfs4_client *clp;
+ struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
+ nfsd_net_id);
+ LIST_HEAD(reaplist);
+
+ if (!nfsd_netns_ready(nn))
+ return count;
+
+ spin_lock(&nn->client_lock);
+ clp = nfsd_find_client(addr, addr_size);
+ if (clp)
+ count = nfsd_collect_client_locks(clp, &reaplist, 0);
+ spin_unlock(&nn->client_lock);
+ nfsd_reap_locks(&reaplist);
+ return count;
+}
+
+u64
+nfsd_inject_forget_locks(u64 max)
+{
+ u64 count = 0;
+ struct nfs4_client *clp;
+ struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
+ nfsd_net_id);
+ LIST_HEAD(reaplist);
+
+ if (!nfsd_netns_ready(nn))
+ return count;
+
+ spin_lock(&nn->client_lock);
+ list_for_each_entry(clp, &nn->client_lru, cl_lru) {
+ count += nfsd_collect_client_locks(clp, &reaplist, max - count);
+ if (max != 0 && count >= max)
+ break;
+ }
+ spin_unlock(&nn->client_lock);
+ nfsd_reap_locks(&reaplist);
+ return count;
+}
+
+static u64
+nfsd_foreach_client_openowner(struct nfs4_client *clp, u64 max,
+ struct list_head *collect,
+ void (*func)(struct nfs4_openowner *))
+{
+ struct nfs4_openowner *oop, *next;
+ struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
+ nfsd_net_id);
+ u64 count = 0;
+
+ lockdep_assert_held(&nn->client_lock);
+
+ spin_lock(&clp->cl_lock);
+ list_for_each_entry_safe(oop, next, &clp->cl_openowners, oo_perclient) {
+ if (func) {
+ func(oop);
+ if (collect) {
+ atomic_inc(&clp->cl_refcount);
+ list_add(&oop->oo_perclient, collect);
+ }
+ }
+ ++count;
+ /*
+ * Despite the fact that these functions deal with
+ * 64-bit integers for "count", we must ensure that
+ * it doesn't blow up the clp->cl_refcount. Throw a
+ * warning if we start to approach INT_MAX here.
+ */
+ WARN_ON_ONCE(count == (INT_MAX / 2));
+ if (count == max)
+ break;
+ }
+ spin_unlock(&clp->cl_lock);
+
+ return count;
+}
+
+static u64
+nfsd_print_client_openowners(struct nfs4_client *clp)
+{
+ u64 count = nfsd_foreach_client_openowner(clp, 0, NULL, NULL);
+
+ nfsd_print_count(clp, count, "openowners");
+ return count;
+}
+
+static u64
+nfsd_collect_client_openowners(struct nfs4_client *clp,
+ struct list_head *collect, u64 max)
+{
+ return nfsd_foreach_client_openowner(clp, max, collect,
+ unhash_openowner_locked);
+}
+
+u64
+nfsd_inject_print_openowners(void)
+{
+ struct nfs4_client *clp;
+ u64 count = 0;
+ struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
+ nfsd_net_id);
+
+ if (!nfsd_netns_ready(nn))
+ return 0;
+
+ spin_lock(&nn->client_lock);
+ list_for_each_entry(clp, &nn->client_lru, cl_lru)
+ count += nfsd_print_client_openowners(clp);
+ spin_unlock(&nn->client_lock);
+
+ return count;
+}
+
+static void
+nfsd_reap_openowners(struct list_head *reaplist)
+{
+ struct nfs4_client *clp;
+ struct nfs4_openowner *oop, *next;
+
+ list_for_each_entry_safe(oop, next, reaplist, oo_perclient) {
+ list_del_init(&oop->oo_perclient);
+ clp = oop->oo_owner.so_client;
+ release_openowner(oop);
+ put_client(clp);
+ }
+}
+
+u64
+nfsd_inject_forget_client_openowners(struct sockaddr_storage *addr,
+ size_t addr_size)
+{
+ unsigned int count = 0;
+ struct nfs4_client *clp;
+ struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
+ nfsd_net_id);
+ LIST_HEAD(reaplist);
+
+ if (!nfsd_netns_ready(nn))
+ return count;
+
+ spin_lock(&nn->client_lock);
+ clp = nfsd_find_client(addr, addr_size);
+ if (clp)
+ count = nfsd_collect_client_openowners(clp, &reaplist, 0);
+ spin_unlock(&nn->client_lock);
+ nfsd_reap_openowners(&reaplist);
+ return count;
+}
+
+u64
+nfsd_inject_forget_openowners(u64 max)
+{
+ u64 count = 0;
+ struct nfs4_client *clp;
+ struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
+ nfsd_net_id);
+ LIST_HEAD(reaplist);
+
+ if (!nfsd_netns_ready(nn))
+ return count;
+
+ spin_lock(&nn->client_lock);
+ list_for_each_entry(clp, &nn->client_lru, cl_lru) {
+ count += nfsd_collect_client_openowners(clp, &reaplist,
+ max - count);
+ if (max != 0 && count >= max)
+ break;
+ }
+ spin_unlock(&nn->client_lock);
+ nfsd_reap_openowners(&reaplist);
+ return count;
+}
+
+static u64 nfsd_find_all_delegations(struct nfs4_client *clp, u64 max,
+ struct list_head *victims)
+{
+ struct nfs4_delegation *dp, *next;
+ struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
+ nfsd_net_id);
+ u64 count = 0;
+
+ lockdep_assert_held(&nn->client_lock);
+
+ spin_lock(&state_lock);
+ list_for_each_entry_safe(dp, next, &clp->cl_delegations, dl_perclnt) {
+ if (victims) {
+ /*
+ * It's not safe to mess with delegations that have a
+ * non-zero dl_time. They might have already been broken
+ * and could be processed by the laundromat outside of
+ * the state_lock. Just leave them be.
+ */
+ if (dp->dl_time != 0)
+ continue;
+
+ atomic_inc(&clp->cl_refcount);
+ WARN_ON(!unhash_delegation_locked(dp));
+ list_add(&dp->dl_recall_lru, victims);
+ }
+ ++count;
+ /*
+ * Despite the fact that these functions deal with
+ * 64-bit integers for "count", we must ensure that
+ * it doesn't blow up the clp->cl_refcount. Throw a
+ * warning if we start to approach INT_MAX here.
+ */
+ WARN_ON_ONCE(count == (INT_MAX / 2));
+ if (count == max)
+ break;
+ }
+ spin_unlock(&state_lock);
+ return count;
+}
+
+static u64
+nfsd_print_client_delegations(struct nfs4_client *clp)
+{
+ u64 count = nfsd_find_all_delegations(clp, 0, NULL);
+
+ nfsd_print_count(clp, count, "delegations");
+ return count;
+}
+
+u64
+nfsd_inject_print_delegations(void)
+{
+ struct nfs4_client *clp;
+ u64 count = 0;
+ struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
+ nfsd_net_id);
+
+ if (!nfsd_netns_ready(nn))
+ return 0;
+
+ spin_lock(&nn->client_lock);
+ list_for_each_entry(clp, &nn->client_lru, cl_lru)
+ count += nfsd_print_client_delegations(clp);
+ spin_unlock(&nn->client_lock);
+
+ return count;
+}
+
+static void
+nfsd_forget_delegations(struct list_head *reaplist)
+{
+ struct nfs4_client *clp;
+ struct nfs4_delegation *dp, *next;
+
+ list_for_each_entry_safe(dp, next, reaplist, dl_recall_lru) {
+ list_del_init(&dp->dl_recall_lru);
+ clp = dp->dl_stid.sc_client;
+ revoke_delegation(dp);
+ put_client(clp);
+ }
+}
+
+u64
+nfsd_inject_forget_client_delegations(struct sockaddr_storage *addr,
+ size_t addr_size)
+{
+ u64 count = 0;
+ struct nfs4_client *clp;
+ struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
+ nfsd_net_id);
+ LIST_HEAD(reaplist);
+
+ if (!nfsd_netns_ready(nn))
+ return count;
+
+ spin_lock(&nn->client_lock);
+ clp = nfsd_find_client(addr, addr_size);
+ if (clp)
+ count = nfsd_find_all_delegations(clp, 0, &reaplist);
+ spin_unlock(&nn->client_lock);
+
+ nfsd_forget_delegations(&reaplist);
+ return count;
+}
+
+u64
+nfsd_inject_forget_delegations(u64 max)
+{
+ u64 count = 0;
+ struct nfs4_client *clp;
+ struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
+ nfsd_net_id);
+ LIST_HEAD(reaplist);
+
+ if (!nfsd_netns_ready(nn))
+ return count;
+
+ spin_lock(&nn->client_lock);
+ list_for_each_entry(clp, &nn->client_lru, cl_lru) {
+ count += nfsd_find_all_delegations(clp, max - count, &reaplist);
+ if (max != 0 && count >= max)
+ break;
+ }
+ spin_unlock(&nn->client_lock);
+ nfsd_forget_delegations(&reaplist);
+ return count;
+}
+
+static void
+nfsd_recall_delegations(struct list_head *reaplist)
+{
+ struct nfs4_client *clp;
+ struct nfs4_delegation *dp, *next;
+
+ list_for_each_entry_safe(dp, next, reaplist, dl_recall_lru) {
+ list_del_init(&dp->dl_recall_lru);
+ clp = dp->dl_stid.sc_client;
+ /*
+ * We skipped all entries that had a zero dl_time before,
+ * so we can now reset the dl_time back to 0. If a delegation
+ * break comes in now, then it won't make any difference since
+ * we're recalling it either way.
+ */
+ spin_lock(&state_lock);
+ dp->dl_time = 0;
+ spin_unlock(&state_lock);
+ nfsd_break_one_deleg(dp);
+ put_client(clp);
+ }
+}
+
+u64
+nfsd_inject_recall_client_delegations(struct sockaddr_storage *addr,
+ size_t addr_size)
+{
+ u64 count = 0;
+ struct nfs4_client *clp;
+ struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
+ nfsd_net_id);
+ LIST_HEAD(reaplist);
+
+ if (!nfsd_netns_ready(nn))
+ return count;
+
+ spin_lock(&nn->client_lock);
+ clp = nfsd_find_client(addr, addr_size);
+ if (clp)
+ count = nfsd_find_all_delegations(clp, 0, &reaplist);
+ spin_unlock(&nn->client_lock);
+
+ nfsd_recall_delegations(&reaplist);
+ return count;
+}
+
+u64
+nfsd_inject_recall_delegations(u64 max)
+{
+ u64 count = 0;
+ struct nfs4_client *clp, *next;
+ struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
+ nfsd_net_id);
+ LIST_HEAD(reaplist);
+
+ if (!nfsd_netns_ready(nn))
+ return count;
+
+ spin_lock(&nn->client_lock);
+ list_for_each_entry_safe(clp, next, &nn->client_lru, cl_lru) {
+ count += nfsd_find_all_delegations(clp, max - count, &reaplist);
+ if (max != 0 && ++count >= max)
+ break;
+ }
+ spin_unlock(&nn->client_lock);
+ nfsd_recall_delegations(&reaplist);
+ return count;
+}
+#endif /* CONFIG_NFSD_FAULT_INJECTION */
+
+/*
+ * Since the lifetime of a delegation isn't limited to that of an open, a
+ * client may quite reasonably hang on to a delegation as long as it has
+ * the inode cached. This becomes an obvious problem the first time a
+ * client's inode cache approaches the size of the server's total memory.
+ *
+ * For now we avoid this problem by imposing a hard limit on the number
+ * of delegations, which varies according to the server's memory size.
+ */
+static void
+set_max_delegations(void)
+{
+ /*
+ * Allow at most 4 delegations per megabyte of RAM. Quick
+ * estimates suggest that in the worst case (where every delegation
+ * is for a different inode), a delegation could take about 1.5K,
+ * giving a worst case usage of about 6% of memory.
+ */
+ max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
+}
+
+static int nfs4_state_create_net(struct net *net)
+{
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+ int i;
+
+ nn->conf_id_hashtbl = kmalloc(sizeof(struct list_head) *
+ CLIENT_HASH_SIZE, GFP_KERNEL);
+ if (!nn->conf_id_hashtbl)
+ goto err;
+ nn->unconf_id_hashtbl = kmalloc(sizeof(struct list_head) *
+ CLIENT_HASH_SIZE, GFP_KERNEL);
+ if (!nn->unconf_id_hashtbl)
+ goto err_unconf_id;
+ nn->sessionid_hashtbl = kmalloc(sizeof(struct list_head) *
+ SESSION_HASH_SIZE, GFP_KERNEL);
+ if (!nn->sessionid_hashtbl)
+ goto err_sessionid;
+
+ for (i = 0; i < CLIENT_HASH_SIZE; i++) {
+ INIT_LIST_HEAD(&nn->conf_id_hashtbl[i]);
+ INIT_LIST_HEAD(&nn->unconf_id_hashtbl[i]);
+ }
+ for (i = 0; i < SESSION_HASH_SIZE; i++)
+ INIT_LIST_HEAD(&nn->sessionid_hashtbl[i]);
+ nn->conf_name_tree = RB_ROOT;
+ nn->unconf_name_tree = RB_ROOT;
+ INIT_LIST_HEAD(&nn->client_lru);
+ INIT_LIST_HEAD(&nn->close_lru);
+ INIT_LIST_HEAD(&nn->del_recall_lru);
+ spin_lock_init(&nn->client_lock);
+
+ INIT_DELAYED_WORK(&nn->laundromat_work, laundromat_main);
+ get_net(net);
+
+ return 0;
+
+err_sessionid:
+ kfree(nn->unconf_id_hashtbl);
+err_unconf_id:
+ kfree(nn->conf_id_hashtbl);
+err:
+ return -ENOMEM;
+}
+
+static void
+nfs4_state_destroy_net(struct net *net)
+{
+ int i;
+ struct nfs4_client *clp = NULL;
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+
+ for (i = 0; i < CLIENT_HASH_SIZE; i++) {
+ while (!list_empty(&nn->conf_id_hashtbl[i])) {
+ clp = list_entry(nn->conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
+ destroy_client(clp);
+ }
+ }
+
+ for (i = 0; i < CLIENT_HASH_SIZE; i++) {
+ while (!list_empty(&nn->unconf_id_hashtbl[i])) {
+ clp = list_entry(nn->unconf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
+ destroy_client(clp);
+ }
+ }
+
+ kfree(nn->sessionid_hashtbl);
+ kfree(nn->unconf_id_hashtbl);
+ kfree(nn->conf_id_hashtbl);
+ put_net(net);
+}
+
+int
+nfs4_state_start_net(struct net *net)
+{
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+ int ret;
+
+ ret = nfs4_state_create_net(net);
+ if (ret)
+ return ret;
+ nn->boot_time = get_seconds();
+ nn->grace_ended = false;
+ nn->nfsd4_manager.block_opens = true;
+ locks_start_grace(net, &nn->nfsd4_manager);
+ nfsd4_client_tracking_init(net);
+ printk(KERN_INFO "NFSD: starting %ld-second grace period (net %p)\n",
+ nn->nfsd4_grace, net);
+ queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_grace * HZ);
+ return 0;
+}
+
+/* initialization to perform when the nfsd service is started: */
+
+int
+nfs4_state_start(void)
+{
+ int ret;
+
+ ret = set_callback_cred();
+ if (ret)
+ return ret;
+
+ laundry_wq = alloc_workqueue("%s", WQ_UNBOUND, 0, "nfsd4");
+ if (laundry_wq == NULL) {
+ ret = -ENOMEM;
+ goto out_cleanup_cred;
+ }
+ ret = nfsd4_create_callback_queue();
+ if (ret)
+ goto out_free_laundry;
+
+ set_max_delegations();
+ return 0;
+
+out_free_laundry:
+ destroy_workqueue(laundry_wq);
+out_cleanup_cred:
+ cleanup_callback_cred();
+ return ret;
+}
+
+void
+nfs4_state_shutdown_net(struct net *net)
+{
+ struct nfs4_delegation *dp = NULL;
+ struct list_head *pos, *next, reaplist;
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+
+ cancel_delayed_work_sync(&nn->laundromat_work);
+ locks_end_grace(&nn->nfsd4_manager);
+
+ INIT_LIST_HEAD(&reaplist);
+ spin_lock(&state_lock);
+ list_for_each_safe(pos, next, &nn->del_recall_lru) {
+ dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
+ WARN_ON(!unhash_delegation_locked(dp));
+ list_add(&dp->dl_recall_lru, &reaplist);
+ }
+ spin_unlock(&state_lock);
+ list_for_each_safe(pos, next, &reaplist) {
+ dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
+ list_del_init(&dp->dl_recall_lru);
+ put_clnt_odstate(dp->dl_clnt_odstate);
+ nfs4_put_deleg_lease(dp->dl_stid.sc_file);
+ nfs4_put_stid(&dp->dl_stid);
+ }
+
+ nfsd4_client_tracking_exit(net);
+ nfs4_state_destroy_net(net);
+}
+
+void
+nfs4_state_shutdown(void)
+{
+ destroy_workqueue(laundry_wq);
+ nfsd4_destroy_callback_queue();
+ cleanup_callback_cred();
+}
+
+static void
+get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
+{
+ if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG) && CURRENT_STATEID(stateid))
+ memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t));
+}
+
+static void
+put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
+{
+ if (cstate->minorversion) {
+ memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t));
+ SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
+ }
+}
+
+void
+clear_current_stateid(struct nfsd4_compound_state *cstate)
+{
+ CLEAR_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
+}
+
+/*
+ * functions to set current state id
+ */
+void
+nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
+{
+ put_stateid(cstate, &odp->od_stateid);
+}
+
+void
+nfsd4_set_openstateid(struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
+{
+ put_stateid(cstate, &open->op_stateid);
+}
+
+void
+nfsd4_set_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
+{
+ put_stateid(cstate, &close->cl_stateid);
+}
+
+void
+nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate, struct nfsd4_lock *lock)
+{
+ put_stateid(cstate, &lock->lk_resp_stateid);
+}
+
+/*
+ * functions to consume current state id
+ */
+
+void
+nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
+{
+ get_stateid(cstate, &odp->od_stateid);
+}
+
+void
+nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate, struct nfsd4_delegreturn *drp)
+{
+ get_stateid(cstate, &drp->dr_stateid);
+}
+
+void
+nfsd4_get_freestateid(struct nfsd4_compound_state *cstate, struct nfsd4_free_stateid *fsp)
+{
+ get_stateid(cstate, &fsp->fr_stateid);
+}
+
+void
+nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate, struct nfsd4_setattr *setattr)
+{
+ get_stateid(cstate, &setattr->sa_stateid);
+}
+
+void
+nfsd4_get_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
+{
+ get_stateid(cstate, &close->cl_stateid);
+}
+
+void
+nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate, struct nfsd4_locku *locku)
+{
+ get_stateid(cstate, &locku->lu_stateid);
+}
+
+void
+nfsd4_get_readstateid(struct nfsd4_compound_state *cstate, struct nfsd4_read *read)
+{
+ get_stateid(cstate, &read->rd_stateid);
+}
+
+void
+nfsd4_get_writestateid(struct nfsd4_compound_state *cstate, struct nfsd4_write *write)
+{
+ get_stateid(cstate, &write->wr_stateid);
+}