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/sysv/sysv.h b/fs/sysv/sysv.h
new file mode 100644
index 0000000..6c21228
--- /dev/null
+++ b/fs/sysv/sysv.h
@@ -0,0 +1,246 @@
+#ifndef _SYSV_H
+#define _SYSV_H
+
+#include <linux/buffer_head.h>
+
+typedef __u16 __bitwise __fs16;
+typedef __u32 __bitwise __fs32;
+
+#include <linux/sysv_fs.h>
+
+/*
+ * SystemV/V7/Coherent super-block data in memory
+ *
+ * The SystemV/V7/Coherent superblock contains dynamic data (it gets modified
+ * while the system is running). This is in contrast to the Minix and Berkeley
+ * filesystems (where the superblock is never modified). This affects the
+ * sync() operation: we must keep the superblock in a disk buffer and use this
+ * one as our "working copy".
+ */
+
+struct sysv_sb_info {
+ struct super_block *s_sb; /* VFS superblock */
+ int s_type; /* file system type: FSTYPE_{XENIX|SYSV|COH} */
+ char s_bytesex; /* bytesex (le/be/pdp) */
+ char s_truncate; /* if 1: names > SYSV_NAMELEN chars are truncated */
+ /* if 0: they are disallowed (ENAMETOOLONG) */
+ unsigned int s_inodes_per_block; /* number of inodes per block */
+ unsigned int s_inodes_per_block_1; /* inodes_per_block - 1 */
+ unsigned int s_inodes_per_block_bits; /* log2(inodes_per_block) */
+ unsigned int s_ind_per_block; /* number of indirections per block */
+ unsigned int s_ind_per_block_bits; /* log2(ind_per_block) */
+ unsigned int s_ind_per_block_2; /* ind_per_block ^ 2 */
+ unsigned int s_toobig_block; /* 10 + ipb + ipb^2 + ipb^3 */
+ unsigned int s_block_base; /* physical block number of block 0 */
+ unsigned short s_fic_size; /* free inode cache size, NICINOD */
+ unsigned short s_flc_size; /* free block list chunk size, NICFREE */
+ /* The superblock is kept in one or two disk buffers: */
+ struct buffer_head *s_bh1;
+ struct buffer_head *s_bh2;
+ /* These are pointers into the disk buffer, to compensate for
+ different superblock layout. */
+ char * s_sbd1; /* entire superblock data, for part 1 */
+ char * s_sbd2; /* entire superblock data, for part 2 */
+ __fs16 *s_sb_fic_count; /* pointer to s_sbd->s_ninode */
+ sysv_ino_t *s_sb_fic_inodes; /* pointer to s_sbd->s_inode */
+ __fs16 *s_sb_total_free_inodes; /* pointer to s_sbd->s_tinode */
+ __fs16 *s_bcache_count; /* pointer to s_sbd->s_nfree */
+ sysv_zone_t *s_bcache; /* pointer to s_sbd->s_free */
+ __fs32 *s_free_blocks; /* pointer to s_sbd->s_tfree */
+ __fs32 *s_sb_time; /* pointer to s_sbd->s_time */
+ __fs32 *s_sb_state; /* pointer to s_sbd->s_state, only FSTYPE_SYSV */
+ /* We keep those superblock entities that don't change here;
+ this saves us an indirection and perhaps a conversion. */
+ u32 s_firstinodezone; /* index of first inode zone */
+ u32 s_firstdatazone; /* same as s_sbd->s_isize */
+ u32 s_ninodes; /* total number of inodes */
+ u32 s_ndatazones; /* total number of data zones */
+ u32 s_nzones; /* same as s_sbd->s_fsize */
+ u16 s_namelen; /* max length of dir entry */
+ int s_forced_ro;
+ struct mutex s_lock;
+};
+
+/*
+ * SystemV/V7/Coherent FS inode data in memory
+ */
+struct sysv_inode_info {
+ __fs32 i_data[13];
+ u32 i_dir_start_lookup;
+ struct inode vfs_inode;
+};
+
+
+static inline struct sysv_inode_info *SYSV_I(struct inode *inode)
+{
+ return container_of(inode, struct sysv_inode_info, vfs_inode);
+}
+
+static inline struct sysv_sb_info *SYSV_SB(struct super_block *sb)
+{
+ return sb->s_fs_info;
+}
+
+
+/* identify the FS in memory */
+enum {
+ FSTYPE_NONE = 0,
+ FSTYPE_XENIX,
+ FSTYPE_SYSV4,
+ FSTYPE_SYSV2,
+ FSTYPE_COH,
+ FSTYPE_V7,
+ FSTYPE_AFS,
+ FSTYPE_END,
+};
+
+#define SYSV_MAGIC_BASE 0x012FF7B3
+
+#define XENIX_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_XENIX)
+#define SYSV4_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_SYSV4)
+#define SYSV2_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_SYSV2)
+#define COH_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_COH)
+
+
+/* Admissible values for i_nlink: 0.._LINK_MAX */
+enum {
+ XENIX_LINK_MAX = 126, /* ?? */
+ SYSV_LINK_MAX = 126, /* 127? 251? */
+ V7_LINK_MAX = 126, /* ?? */
+ COH_LINK_MAX = 10000,
+};
+
+
+static inline void dirty_sb(struct super_block *sb)
+{
+ struct sysv_sb_info *sbi = SYSV_SB(sb);
+
+ mark_buffer_dirty(sbi->s_bh1);
+ if (sbi->s_bh1 != sbi->s_bh2)
+ mark_buffer_dirty(sbi->s_bh2);
+}
+
+
+/* ialloc.c */
+extern struct sysv_inode *sysv_raw_inode(struct super_block *, unsigned,
+ struct buffer_head **);
+extern struct inode * sysv_new_inode(const struct inode *, umode_t);
+extern void sysv_free_inode(struct inode *);
+extern unsigned long sysv_count_free_inodes(struct super_block *);
+
+/* balloc.c */
+extern sysv_zone_t sysv_new_block(struct super_block *);
+extern void sysv_free_block(struct super_block *, sysv_zone_t);
+extern unsigned long sysv_count_free_blocks(struct super_block *);
+
+/* itree.c */
+extern void sysv_truncate(struct inode *);
+extern int sysv_prepare_chunk(struct page *page, loff_t pos, unsigned len);
+
+/* inode.c */
+extern struct inode *sysv_iget(struct super_block *, unsigned int);
+extern int sysv_write_inode(struct inode *, struct writeback_control *wbc);
+extern int sysv_sync_inode(struct inode *);
+extern void sysv_set_inode(struct inode *, dev_t);
+extern int sysv_getattr(struct vfsmount *, struct dentry *, struct kstat *);
+extern int sysv_init_icache(void);
+extern void sysv_destroy_icache(void);
+
+
+/* dir.c */
+extern struct sysv_dir_entry *sysv_find_entry(struct dentry *, struct page **);
+extern int sysv_add_link(struct dentry *, struct inode *);
+extern int sysv_delete_entry(struct sysv_dir_entry *, struct page *);
+extern int sysv_make_empty(struct inode *, struct inode *);
+extern int sysv_empty_dir(struct inode *);
+extern void sysv_set_link(struct sysv_dir_entry *, struct page *,
+ struct inode *);
+extern struct sysv_dir_entry *sysv_dotdot(struct inode *, struct page **);
+extern ino_t sysv_inode_by_name(struct dentry *);
+
+
+extern const struct inode_operations sysv_file_inode_operations;
+extern const struct inode_operations sysv_dir_inode_operations;
+extern const struct file_operations sysv_file_operations;
+extern const struct file_operations sysv_dir_operations;
+extern const struct address_space_operations sysv_aops;
+extern const struct super_operations sysv_sops;
+extern const struct dentry_operations sysv_dentry_operations;
+
+
+enum {
+ BYTESEX_LE,
+ BYTESEX_PDP,
+ BYTESEX_BE,
+};
+
+static inline u32 PDP_swab(u32 x)
+{
+#ifdef __LITTLE_ENDIAN
+ return ((x & 0xffff) << 16) | ((x & 0xffff0000) >> 16);
+#else
+#ifdef __BIG_ENDIAN
+ return ((x & 0xff00ff) << 8) | ((x & 0xff00ff00) >> 8);
+#else
+#error BYTESEX
+#endif
+#endif
+}
+
+static inline __u32 fs32_to_cpu(struct sysv_sb_info *sbi, __fs32 n)
+{
+ if (sbi->s_bytesex == BYTESEX_PDP)
+ return PDP_swab((__force __u32)n);
+ else if (sbi->s_bytesex == BYTESEX_LE)
+ return le32_to_cpu((__force __le32)n);
+ else
+ return be32_to_cpu((__force __be32)n);
+}
+
+static inline __fs32 cpu_to_fs32(struct sysv_sb_info *sbi, __u32 n)
+{
+ if (sbi->s_bytesex == BYTESEX_PDP)
+ return (__force __fs32)PDP_swab(n);
+ else if (sbi->s_bytesex == BYTESEX_LE)
+ return (__force __fs32)cpu_to_le32(n);
+ else
+ return (__force __fs32)cpu_to_be32(n);
+}
+
+static inline __fs32 fs32_add(struct sysv_sb_info *sbi, __fs32 *n, int d)
+{
+ if (sbi->s_bytesex == BYTESEX_PDP)
+ *(__u32*)n = PDP_swab(PDP_swab(*(__u32*)n)+d);
+ else if (sbi->s_bytesex == BYTESEX_LE)
+ le32_add_cpu((__le32 *)n, d);
+ else
+ be32_add_cpu((__be32 *)n, d);
+ return *n;
+}
+
+static inline __u16 fs16_to_cpu(struct sysv_sb_info *sbi, __fs16 n)
+{
+ if (sbi->s_bytesex != BYTESEX_BE)
+ return le16_to_cpu((__force __le16)n);
+ else
+ return be16_to_cpu((__force __be16)n);
+}
+
+static inline __fs16 cpu_to_fs16(struct sysv_sb_info *sbi, __u16 n)
+{
+ if (sbi->s_bytesex != BYTESEX_BE)
+ return (__force __fs16)cpu_to_le16(n);
+ else
+ return (__force __fs16)cpu_to_be16(n);
+}
+
+static inline __fs16 fs16_add(struct sysv_sb_info *sbi, __fs16 *n, int d)
+{
+ if (sbi->s_bytesex != BYTESEX_BE)
+ le16_add_cpu((__le16 *)n, d);
+ else
+ be16_add_cpu((__be16 *)n, d);
+ return *n;
+}
+
+#endif /* _SYSV_H */