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/f2fs/dir.c b/fs/f2fs/dir.c
new file mode 100644
index 0000000..60972a5
--- /dev/null
+++ b/fs/f2fs/dir.c
@@ -0,0 +1,902 @@
+/*
+ * fs/f2fs/dir.c
+ *
+ * Copyright (c) 2012 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/fs.h>
+#include <linux/f2fs_fs.h>
+#include "f2fs.h"
+#include "node.h"
+#include "acl.h"
+#include "xattr.h"
+
+static unsigned long dir_blocks(struct inode *inode)
+{
+ return ((unsigned long long) (i_size_read(inode) + PAGE_CACHE_SIZE - 1))
+ >> PAGE_CACHE_SHIFT;
+}
+
+static unsigned int dir_buckets(unsigned int level, int dir_level)
+{
+ if (level + dir_level < MAX_DIR_HASH_DEPTH / 2)
+ return 1 << (level + dir_level);
+ else
+ return MAX_DIR_BUCKETS;
+}
+
+static unsigned int bucket_blocks(unsigned int level)
+{
+ if (level < MAX_DIR_HASH_DEPTH / 2)
+ return 2;
+ else
+ return 4;
+}
+
+unsigned char f2fs_filetype_table[F2FS_FT_MAX] = {
+ [F2FS_FT_UNKNOWN] = DT_UNKNOWN,
+ [F2FS_FT_REG_FILE] = DT_REG,
+ [F2FS_FT_DIR] = DT_DIR,
+ [F2FS_FT_CHRDEV] = DT_CHR,
+ [F2FS_FT_BLKDEV] = DT_BLK,
+ [F2FS_FT_FIFO] = DT_FIFO,
+ [F2FS_FT_SOCK] = DT_SOCK,
+ [F2FS_FT_SYMLINK] = DT_LNK,
+};
+
+#define S_SHIFT 12
+static unsigned char f2fs_type_by_mode[S_IFMT >> S_SHIFT] = {
+ [S_IFREG >> S_SHIFT] = F2FS_FT_REG_FILE,
+ [S_IFDIR >> S_SHIFT] = F2FS_FT_DIR,
+ [S_IFCHR >> S_SHIFT] = F2FS_FT_CHRDEV,
+ [S_IFBLK >> S_SHIFT] = F2FS_FT_BLKDEV,
+ [S_IFIFO >> S_SHIFT] = F2FS_FT_FIFO,
+ [S_IFSOCK >> S_SHIFT] = F2FS_FT_SOCK,
+ [S_IFLNK >> S_SHIFT] = F2FS_FT_SYMLINK,
+};
+
+void set_de_type(struct f2fs_dir_entry *de, umode_t mode)
+{
+ de->file_type = f2fs_type_by_mode[(mode & S_IFMT) >> S_SHIFT];
+}
+
+static unsigned long dir_block_index(unsigned int level,
+ int dir_level, unsigned int idx)
+{
+ unsigned long i;
+ unsigned long bidx = 0;
+
+ for (i = 0; i < level; i++)
+ bidx += dir_buckets(i, dir_level) * bucket_blocks(i);
+ bidx += idx * bucket_blocks(level);
+ return bidx;
+}
+
+static struct f2fs_dir_entry *find_in_block(struct page *dentry_page,
+ struct f2fs_filename *fname,
+ f2fs_hash_t namehash,
+ int *max_slots,
+ struct page **res_page)
+{
+ struct f2fs_dentry_block *dentry_blk;
+ struct f2fs_dir_entry *de;
+ struct f2fs_dentry_ptr d;
+
+ dentry_blk = (struct f2fs_dentry_block *)kmap(dentry_page);
+
+ make_dentry_ptr(NULL, &d, (void *)dentry_blk, 1);
+ de = find_target_dentry(fname, namehash, max_slots, &d);
+ if (de)
+ *res_page = dentry_page;
+ else
+ kunmap(dentry_page);
+
+ /*
+ * For the most part, it should be a bug when name_len is zero.
+ * We stop here for figuring out where the bugs has occurred.
+ */
+ f2fs_bug_on(F2FS_P_SB(dentry_page), d.max < 0);
+ return de;
+}
+
+struct f2fs_dir_entry *find_target_dentry(struct f2fs_filename *fname,
+ f2fs_hash_t namehash, int *max_slots,
+ struct f2fs_dentry_ptr *d)
+{
+ struct f2fs_dir_entry *de;
+ unsigned long bit_pos = 0;
+ int max_len = 0;
+ struct f2fs_str de_name = FSTR_INIT(NULL, 0);
+ struct f2fs_str *name = &fname->disk_name;
+
+ if (max_slots)
+ *max_slots = 0;
+ while (bit_pos < d->max) {
+ if (!test_bit_le(bit_pos, d->bitmap)) {
+ bit_pos++;
+ max_len++;
+ continue;
+ }
+
+ de = &d->dentry[bit_pos];
+
+ if (de->hash_code != namehash)
+ goto not_match;
+
+ de_name.name = d->filename[bit_pos];
+ de_name.len = le16_to_cpu(de->name_len);
+
+#ifdef CONFIG_F2FS_FS_ENCRYPTION
+ if (unlikely(!name->name)) {
+ if (fname->usr_fname->name[0] == '_') {
+ if (de_name.len > 32 &&
+ !memcmp(de_name.name + ((de_name.len - 17) & ~15),
+ fname->crypto_buf.name + 8, 16))
+ goto found;
+ goto not_match;
+ }
+ name->name = fname->crypto_buf.name;
+ name->len = fname->crypto_buf.len;
+ }
+#endif
+ if (de_name.len == name->len &&
+ !memcmp(de_name.name, name->name, name->len))
+ goto found;
+not_match:
+ if (max_slots && max_len > *max_slots)
+ *max_slots = max_len;
+ max_len = 0;
+
+ /* remain bug on condition */
+ if (unlikely(!de->name_len))
+ d->max = -1;
+
+ bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
+ }
+
+ de = NULL;
+found:
+ if (max_slots && max_len > *max_slots)
+ *max_slots = max_len;
+ return de;
+}
+
+static struct f2fs_dir_entry *find_in_level(struct inode *dir,
+ unsigned int level,
+ struct f2fs_filename *fname,
+ struct page **res_page)
+{
+ struct qstr name = FSTR_TO_QSTR(&fname->disk_name);
+ int s = GET_DENTRY_SLOTS(name.len);
+ unsigned int nbucket, nblock;
+ unsigned int bidx, end_block;
+ struct page *dentry_page;
+ struct f2fs_dir_entry *de = NULL;
+ bool room = false;
+ int max_slots;
+ f2fs_hash_t namehash;
+
+ namehash = f2fs_dentry_hash(&name, fname);
+
+ f2fs_bug_on(F2FS_I_SB(dir), level > MAX_DIR_HASH_DEPTH);
+
+ nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level);
+ nblock = bucket_blocks(level);
+
+ bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level,
+ le32_to_cpu(namehash) % nbucket);
+ end_block = bidx + nblock;
+
+ for (; bidx < end_block; bidx++) {
+ /* no need to allocate new dentry pages to all the indices */
+ dentry_page = find_data_page(dir, bidx);
+ if (IS_ERR(dentry_page)) {
+ room = true;
+ continue;
+ }
+
+ de = find_in_block(dentry_page, fname, namehash, &max_slots,
+ res_page);
+ if (de)
+ break;
+
+ if (max_slots >= s)
+ room = true;
+ f2fs_put_page(dentry_page, 0);
+ }
+
+ if (!de && room && F2FS_I(dir)->chash != namehash) {
+ F2FS_I(dir)->chash = namehash;
+ F2FS_I(dir)->clevel = level;
+ }
+
+ return de;
+}
+
+/*
+ * Find an entry in the specified directory with the wanted name.
+ * It returns the page where the entry was found (as a parameter - res_page),
+ * and the entry itself. Page is returned mapped and unlocked.
+ * Entry is guaranteed to be valid.
+ */
+struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir,
+ struct qstr *child, struct page **res_page)
+{
+ unsigned long npages = dir_blocks(dir);
+ struct f2fs_dir_entry *de = NULL;
+ unsigned int max_depth;
+ unsigned int level;
+ struct f2fs_filename fname;
+ int err;
+
+ *res_page = NULL;
+
+ err = f2fs_fname_setup_filename(dir, child, 1, &fname);
+ if (err)
+ return NULL;
+
+ if (f2fs_has_inline_dentry(dir)) {
+ de = find_in_inline_dir(dir, &fname, res_page);
+ goto out;
+ }
+
+ if (npages == 0)
+ goto out;
+
+ max_depth = F2FS_I(dir)->i_current_depth;
+
+ for (level = 0; level < max_depth; level++) {
+ de = find_in_level(dir, level, &fname, res_page);
+ if (de)
+ break;
+ }
+out:
+ f2fs_fname_free_filename(&fname);
+ return de;
+}
+
+struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p)
+{
+ struct page *page;
+ struct f2fs_dir_entry *de;
+ struct f2fs_dentry_block *dentry_blk;
+
+ if (f2fs_has_inline_dentry(dir))
+ return f2fs_parent_inline_dir(dir, p);
+
+ page = get_lock_data_page(dir, 0, false);
+ if (IS_ERR(page))
+ return NULL;
+
+ dentry_blk = kmap(page);
+ de = &dentry_blk->dentry[1];
+ *p = page;
+ unlock_page(page);
+ return de;
+}
+
+ino_t f2fs_inode_by_name(struct inode *dir, struct qstr *qstr)
+{
+ ino_t res = 0;
+ struct f2fs_dir_entry *de;
+ struct page *page;
+
+ de = f2fs_find_entry(dir, qstr, &page);
+ if (de) {
+ res = le32_to_cpu(de->ino);
+ f2fs_dentry_kunmap(dir, page);
+ f2fs_put_page(page, 0);
+ }
+
+ return res;
+}
+
+void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de,
+ struct page *page, struct inode *inode)
+{
+ enum page_type type = f2fs_has_inline_dentry(dir) ? NODE : DATA;
+ lock_page(page);
+ f2fs_wait_on_page_writeback(page, type);
+ de->ino = cpu_to_le32(inode->i_ino);
+ set_de_type(de, inode->i_mode);
+ f2fs_dentry_kunmap(dir, page);
+ set_page_dirty(page);
+ dir->i_mtime = dir->i_ctime = CURRENT_TIME;
+ mark_inode_dirty(dir);
+
+ f2fs_put_page(page, 1);
+}
+
+static void init_dent_inode(const struct qstr *name, struct page *ipage)
+{
+ struct f2fs_inode *ri;
+
+ f2fs_wait_on_page_writeback(ipage, NODE);
+
+ /* copy name info. to this inode page */
+ ri = F2FS_INODE(ipage);
+ ri->i_namelen = cpu_to_le32(name->len);
+ memcpy(ri->i_name, name->name, name->len);
+ set_page_dirty(ipage);
+}
+
+int update_dent_inode(struct inode *inode, struct inode *to,
+ const struct qstr *name)
+{
+ struct page *page;
+
+ if (file_enc_name(to))
+ return 0;
+
+ page = get_node_page(F2FS_I_SB(inode), inode->i_ino);
+ if (IS_ERR(page))
+ return PTR_ERR(page);
+
+ init_dent_inode(name, page);
+ f2fs_put_page(page, 1);
+
+ return 0;
+}
+
+void do_make_empty_dir(struct inode *inode, struct inode *parent,
+ struct f2fs_dentry_ptr *d)
+{
+ struct f2fs_dir_entry *de;
+
+ de = &d->dentry[0];
+ de->name_len = cpu_to_le16(1);
+ de->hash_code = 0;
+ de->ino = cpu_to_le32(inode->i_ino);
+ memcpy(d->filename[0], ".", 1);
+ set_de_type(de, inode->i_mode);
+
+ de = &d->dentry[1];
+ de->hash_code = 0;
+ de->name_len = cpu_to_le16(2);
+ de->ino = cpu_to_le32(parent->i_ino);
+ memcpy(d->filename[1], "..", 2);
+ set_de_type(de, parent->i_mode);
+
+ test_and_set_bit_le(0, (void *)d->bitmap);
+ test_and_set_bit_le(1, (void *)d->bitmap);
+}
+
+static int make_empty_dir(struct inode *inode,
+ struct inode *parent, struct page *page)
+{
+ struct page *dentry_page;
+ struct f2fs_dentry_block *dentry_blk;
+ struct f2fs_dentry_ptr d;
+
+ if (f2fs_has_inline_dentry(inode))
+ return make_empty_inline_dir(inode, parent, page);
+
+ dentry_page = get_new_data_page(inode, page, 0, true);
+ if (IS_ERR(dentry_page))
+ return PTR_ERR(dentry_page);
+
+ dentry_blk = kmap_atomic(dentry_page);
+
+ make_dentry_ptr(NULL, &d, (void *)dentry_blk, 1);
+ do_make_empty_dir(inode, parent, &d);
+
+ kunmap_atomic(dentry_blk);
+
+ set_page_dirty(dentry_page);
+ f2fs_put_page(dentry_page, 1);
+ return 0;
+}
+
+struct page *init_inode_metadata(struct inode *inode, struct inode *dir,
+ const struct qstr *name, struct page *dpage)
+{
+ struct page *page;
+ int err;
+
+ if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) {
+ page = new_inode_page(inode);
+ if (IS_ERR(page))
+ return page;
+
+ if (S_ISDIR(inode->i_mode)) {
+ err = make_empty_dir(inode, dir, page);
+ if (err)
+ goto error;
+ }
+
+ err = f2fs_init_acl(inode, dir, page, dpage);
+ if (err)
+ goto put_error;
+
+ err = f2fs_init_security(inode, dir, name, page);
+ if (err)
+ goto put_error;
+
+ if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode)) {
+ err = f2fs_inherit_context(dir, inode, page);
+ if (err)
+ goto put_error;
+ }
+ } else {
+ page = get_node_page(F2FS_I_SB(dir), inode->i_ino);
+ if (IS_ERR(page))
+ return page;
+
+ set_cold_node(inode, page);
+ }
+
+ if (name)
+ init_dent_inode(name, page);
+
+ /*
+ * This file should be checkpointed during fsync.
+ * We lost i_pino from now on.
+ */
+ if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) {
+ file_lost_pino(inode);
+ /*
+ * If link the tmpfile to alias through linkat path,
+ * we should remove this inode from orphan list.
+ */
+ if (inode->i_nlink == 0)
+ remove_orphan_inode(F2FS_I_SB(dir), inode->i_ino);
+ inc_nlink(inode);
+ }
+ return page;
+
+put_error:
+ f2fs_put_page(page, 1);
+error:
+ /* once the failed inode becomes a bad inode, i_mode is S_IFREG */
+ truncate_inode_pages(&inode->i_data, 0);
+ truncate_blocks(inode, 0, false);
+ remove_dirty_dir_inode(inode);
+ remove_inode_page(inode);
+ return ERR_PTR(err);
+}
+
+void update_parent_metadata(struct inode *dir, struct inode *inode,
+ unsigned int current_depth)
+{
+ if (inode && is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) {
+ if (S_ISDIR(inode->i_mode)) {
+ inc_nlink(dir);
+ set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
+ }
+ clear_inode_flag(F2FS_I(inode), FI_NEW_INODE);
+ }
+ dir->i_mtime = dir->i_ctime = CURRENT_TIME;
+ mark_inode_dirty(dir);
+
+ if (F2FS_I(dir)->i_current_depth != current_depth) {
+ F2FS_I(dir)->i_current_depth = current_depth;
+ set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
+ }
+
+ if (inode && is_inode_flag_set(F2FS_I(inode), FI_INC_LINK))
+ clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
+}
+
+int room_for_filename(const void *bitmap, int slots, int max_slots)
+{
+ int bit_start = 0;
+ int zero_start, zero_end;
+next:
+ zero_start = find_next_zero_bit_le(bitmap, max_slots, bit_start);
+ if (zero_start >= max_slots)
+ return max_slots;
+
+ zero_end = find_next_bit_le(bitmap, max_slots, zero_start);
+ if (zero_end - zero_start >= slots)
+ return zero_start;
+
+ bit_start = zero_end + 1;
+
+ if (zero_end + 1 >= max_slots)
+ return max_slots;
+ goto next;
+}
+
+void f2fs_update_dentry(nid_t ino, umode_t mode, struct f2fs_dentry_ptr *d,
+ const struct qstr *name, f2fs_hash_t name_hash,
+ unsigned int bit_pos)
+{
+ struct f2fs_dir_entry *de;
+ int slots = GET_DENTRY_SLOTS(name->len);
+ int i;
+
+ de = &d->dentry[bit_pos];
+ de->hash_code = name_hash;
+ de->name_len = cpu_to_le16(name->len);
+ memcpy(d->filename[bit_pos], name->name, name->len);
+ de->ino = cpu_to_le32(ino);
+ set_de_type(de, mode);
+ for (i = 0; i < slots; i++)
+ test_and_set_bit_le(bit_pos + i, (void *)d->bitmap);
+}
+
+/*
+ * Caller should grab and release a rwsem by calling f2fs_lock_op() and
+ * f2fs_unlock_op().
+ */
+int __f2fs_add_link(struct inode *dir, const struct qstr *name,
+ struct inode *inode, nid_t ino, umode_t mode)
+{
+ unsigned int bit_pos;
+ unsigned int level;
+ unsigned int current_depth;
+ unsigned long bidx, block;
+ f2fs_hash_t dentry_hash;
+ unsigned int nbucket, nblock;
+ struct page *dentry_page = NULL;
+ struct f2fs_dentry_block *dentry_blk = NULL;
+ struct f2fs_dentry_ptr d;
+ struct page *page = NULL;
+ struct f2fs_filename fname;
+ struct qstr new_name;
+ int slots, err;
+
+ err = f2fs_fname_setup_filename(dir, name, 0, &fname);
+ if (err)
+ return err;
+
+ new_name.name = fname_name(&fname);
+ new_name.len = fname_len(&fname);
+
+ if (f2fs_has_inline_dentry(dir)) {
+ err = f2fs_add_inline_entry(dir, &new_name, inode, ino, mode);
+ if (!err || err != -EAGAIN)
+ goto out;
+ else
+ err = 0;
+ }
+
+ level = 0;
+ slots = GET_DENTRY_SLOTS(new_name.len);
+ dentry_hash = f2fs_dentry_hash(&new_name, NULL);
+
+ current_depth = F2FS_I(dir)->i_current_depth;
+ if (F2FS_I(dir)->chash == dentry_hash) {
+ level = F2FS_I(dir)->clevel;
+ F2FS_I(dir)->chash = 0;
+ }
+
+start:
+ if (unlikely(current_depth == MAX_DIR_HASH_DEPTH)) {
+ err = -ENOSPC;
+ goto out;
+ }
+
+ /* Increase the depth, if required */
+ if (level == current_depth)
+ ++current_depth;
+
+ nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level);
+ nblock = bucket_blocks(level);
+
+ bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level,
+ (le32_to_cpu(dentry_hash) % nbucket));
+
+ for (block = bidx; block <= (bidx + nblock - 1); block++) {
+ dentry_page = get_new_data_page(dir, NULL, block, true);
+ if (IS_ERR(dentry_page)) {
+ err = PTR_ERR(dentry_page);
+ goto out;
+ }
+
+ dentry_blk = kmap(dentry_page);
+ bit_pos = room_for_filename(&dentry_blk->dentry_bitmap,
+ slots, NR_DENTRY_IN_BLOCK);
+ if (bit_pos < NR_DENTRY_IN_BLOCK)
+ goto add_dentry;
+
+ kunmap(dentry_page);
+ f2fs_put_page(dentry_page, 1);
+ }
+
+ /* Move to next level to find the empty slot for new dentry */
+ ++level;
+ goto start;
+add_dentry:
+ f2fs_wait_on_page_writeback(dentry_page, DATA);
+
+ if (inode) {
+ down_write(&F2FS_I(inode)->i_sem);
+ page = init_inode_metadata(inode, dir, &new_name, NULL);
+ if (IS_ERR(page)) {
+ err = PTR_ERR(page);
+ goto fail;
+ }
+ if (f2fs_encrypted_inode(dir))
+ file_set_enc_name(inode);
+ }
+
+ make_dentry_ptr(NULL, &d, (void *)dentry_blk, 1);
+ f2fs_update_dentry(ino, mode, &d, &new_name, dentry_hash, bit_pos);
+
+ set_page_dirty(dentry_page);
+
+ if (inode) {
+ /* we don't need to mark_inode_dirty now */
+ F2FS_I(inode)->i_pino = dir->i_ino;
+ update_inode(inode, page);
+ f2fs_put_page(page, 1);
+ }
+
+ update_parent_metadata(dir, inode, current_depth);
+fail:
+ if (inode)
+ up_write(&F2FS_I(inode)->i_sem);
+
+ if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR)) {
+ update_inode_page(dir);
+ clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
+ }
+ kunmap(dentry_page);
+ f2fs_put_page(dentry_page, 1);
+out:
+ f2fs_fname_free_filename(&fname);
+ return err;
+}
+
+int f2fs_do_tmpfile(struct inode *inode, struct inode *dir)
+{
+ struct page *page;
+ int err = 0;
+
+ down_write(&F2FS_I(inode)->i_sem);
+ page = init_inode_metadata(inode, dir, NULL, NULL);
+ if (IS_ERR(page)) {
+ err = PTR_ERR(page);
+ goto fail;
+ }
+ /* we don't need to mark_inode_dirty now */
+ update_inode(inode, page);
+ f2fs_put_page(page, 1);
+
+ clear_inode_flag(F2FS_I(inode), FI_NEW_INODE);
+fail:
+ up_write(&F2FS_I(inode)->i_sem);
+ return err;
+}
+
+void f2fs_drop_nlink(struct inode *dir, struct inode *inode, struct page *page)
+{
+ struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
+
+ down_write(&F2FS_I(inode)->i_sem);
+
+ if (S_ISDIR(inode->i_mode)) {
+ drop_nlink(dir);
+ if (page)
+ update_inode(dir, page);
+ else
+ update_inode_page(dir);
+ }
+ inode->i_ctime = CURRENT_TIME;
+
+ drop_nlink(inode);
+ if (S_ISDIR(inode->i_mode)) {
+ drop_nlink(inode);
+ i_size_write(inode, 0);
+ }
+ up_write(&F2FS_I(inode)->i_sem);
+ update_inode_page(inode);
+
+ if (inode->i_nlink == 0)
+ add_orphan_inode(sbi, inode->i_ino);
+ else
+ release_orphan_inode(sbi);
+}
+
+/*
+ * It only removes the dentry from the dentry page, corresponding name
+ * entry in name page does not need to be touched during deletion.
+ */
+void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page,
+ struct inode *dir, struct inode *inode)
+{
+ struct f2fs_dentry_block *dentry_blk;
+ unsigned int bit_pos;
+ int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
+ int i;
+
+ if (f2fs_has_inline_dentry(dir))
+ return f2fs_delete_inline_entry(dentry, page, dir, inode);
+
+ lock_page(page);
+ f2fs_wait_on_page_writeback(page, DATA);
+
+ dentry_blk = page_address(page);
+ bit_pos = dentry - dentry_blk->dentry;
+ for (i = 0; i < slots; i++)
+ clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
+
+ /* Let's check and deallocate this dentry page */
+ bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
+ NR_DENTRY_IN_BLOCK,
+ 0);
+ kunmap(page); /* kunmap - pair of f2fs_find_entry */
+ set_page_dirty(page);
+
+ dir->i_ctime = dir->i_mtime = CURRENT_TIME;
+
+ if (inode)
+ f2fs_drop_nlink(dir, inode, NULL);
+
+ if (bit_pos == NR_DENTRY_IN_BLOCK &&
+ !truncate_hole(dir, page->index, page->index + 1)) {
+ clear_page_dirty_for_io(page);
+ ClearPagePrivate(page);
+ ClearPageUptodate(page);
+ inode_dec_dirty_pages(dir);
+ }
+ f2fs_put_page(page, 1);
+}
+
+bool f2fs_empty_dir(struct inode *dir)
+{
+ unsigned long bidx;
+ struct page *dentry_page;
+ unsigned int bit_pos;
+ struct f2fs_dentry_block *dentry_blk;
+ unsigned long nblock = dir_blocks(dir);
+
+ if (f2fs_has_inline_dentry(dir))
+ return f2fs_empty_inline_dir(dir);
+
+ for (bidx = 0; bidx < nblock; bidx++) {
+ dentry_page = get_lock_data_page(dir, bidx, false);
+ if (IS_ERR(dentry_page)) {
+ if (PTR_ERR(dentry_page) == -ENOENT)
+ continue;
+ else
+ return false;
+ }
+
+ dentry_blk = kmap_atomic(dentry_page);
+ if (bidx == 0)
+ bit_pos = 2;
+ else
+ bit_pos = 0;
+ bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
+ NR_DENTRY_IN_BLOCK,
+ bit_pos);
+ kunmap_atomic(dentry_blk);
+
+ f2fs_put_page(dentry_page, 1);
+
+ if (bit_pos < NR_DENTRY_IN_BLOCK)
+ return false;
+ }
+ return true;
+}
+
+bool f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d,
+ unsigned int start_pos, struct f2fs_str *fstr)
+{
+ unsigned char d_type = DT_UNKNOWN;
+ unsigned int bit_pos;
+ struct f2fs_dir_entry *de = NULL;
+ struct f2fs_str de_name = FSTR_INIT(NULL, 0);
+
+ bit_pos = ((unsigned long)ctx->pos % d->max);
+
+ while (bit_pos < d->max) {
+ bit_pos = find_next_bit_le(d->bitmap, d->max, bit_pos);
+ if (bit_pos >= d->max)
+ break;
+
+ de = &d->dentry[bit_pos];
+ if (de->file_type < F2FS_FT_MAX)
+ d_type = f2fs_filetype_table[de->file_type];
+ else
+ d_type = DT_UNKNOWN;
+
+ de_name.name = d->filename[bit_pos];
+ de_name.len = le16_to_cpu(de->name_len);
+
+ if (f2fs_encrypted_inode(d->inode)) {
+ int save_len = fstr->len;
+ int ret;
+
+ de_name.name = kmalloc(de_name.len, GFP_NOFS);
+ if (!de_name.name)
+ return false;
+
+ memcpy(de_name.name, d->filename[bit_pos], de_name.len);
+
+ ret = f2fs_fname_disk_to_usr(d->inode, &de->hash_code,
+ &de_name, fstr);
+ kfree(de_name.name);
+ if (ret < 0)
+ return true;
+
+ de_name = *fstr;
+ fstr->len = save_len;
+ }
+
+ if (!dir_emit(ctx, de_name.name, de_name.len,
+ le32_to_cpu(de->ino), d_type))
+ return true;
+
+ bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
+ ctx->pos = start_pos + bit_pos;
+ }
+ return false;
+}
+
+static int f2fs_readdir(struct file *file, struct dir_context *ctx)
+{
+ struct inode *inode = file_inode(file);
+ unsigned long npages = dir_blocks(inode);
+ struct f2fs_dentry_block *dentry_blk = NULL;
+ struct page *dentry_page = NULL;
+ struct file_ra_state *ra = &file->f_ra;
+ unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK);
+ struct f2fs_dentry_ptr d;
+ struct f2fs_str fstr = FSTR_INIT(NULL, 0);
+ int err = 0;
+
+ if (f2fs_encrypted_inode(inode)) {
+ err = f2fs_get_encryption_info(inode);
+ if (err)
+ return err;
+
+ err = f2fs_fname_crypto_alloc_buffer(inode, F2FS_NAME_LEN,
+ &fstr);
+ if (err < 0)
+ return err;
+ }
+
+ if (f2fs_has_inline_dentry(inode)) {
+ err = f2fs_read_inline_dir(file, ctx, &fstr);
+ goto out;
+ }
+
+ /* readahead for multi pages of dir */
+ if (npages - n > 1 && !ra_has_index(ra, n))
+ page_cache_sync_readahead(inode->i_mapping, ra, file, n,
+ min(npages - n, (pgoff_t)MAX_DIR_RA_PAGES));
+
+ for (; n < npages; n++) {
+ dentry_page = get_lock_data_page(inode, n, false);
+ if (IS_ERR(dentry_page))
+ continue;
+
+ dentry_blk = kmap(dentry_page);
+
+ make_dentry_ptr(inode, &d, (void *)dentry_blk, 1);
+
+ if (f2fs_fill_dentries(ctx, &d, n * NR_DENTRY_IN_BLOCK, &fstr))
+ goto stop;
+
+ ctx->pos = (n + 1) * NR_DENTRY_IN_BLOCK;
+ kunmap(dentry_page);
+ f2fs_put_page(dentry_page, 1);
+ dentry_page = NULL;
+ }
+stop:
+ if (dentry_page && !IS_ERR(dentry_page)) {
+ kunmap(dentry_page);
+ f2fs_put_page(dentry_page, 1);
+ }
+out:
+ f2fs_fname_crypto_free_buffer(&fstr);
+ return err;
+}
+
+const struct file_operations f2fs_dir_operations = {
+ .llseek = generic_file_llseek,
+ .read = generic_read_dir,
+ .iterate = f2fs_readdir,
+ .fsync = f2fs_sync_file,
+ .unlocked_ioctl = f2fs_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = f2fs_compat_ioctl,
+#endif
+};