diff options
| author | Dave Chinner <dchinner@redhat.com> | 2013-08-12 20:49:40 +1000 |
|---|---|---|
| committer | Ben Myers <bpm@sgi.com> | 2013-08-12 16:43:38 -0500 |
| commit | 1fb7e48db6810093012873a652062648ace6b5bb (patch) | |
| tree | 7ca9cf8073d2768fbbb44299299dd222efaf3b48 /fs/xfs/xfs_format.h | |
| parent | fde2227ce12b6d3e1945bd512da2a4a333331a2c (diff) | |
| download | lwn-1fb7e48db6810093012873a652062648ace6b5bb.tar.gz lwn-1fb7e48db6810093012873a652062648ace6b5bb.zip | |
xfs: split out the remote symlink handling
The remote symlink format definition and manipulation needs to be
shared with userspace, but the in-kernel interfaces do not. Split
the remote symlink format handling out into xfs_symlink_remote.[ch]
fo it can easily be shared with userspace.
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_format.h')
| -rw-r--r-- | fs/xfs/xfs_format.h | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/fs/xfs/xfs_format.h b/fs/xfs/xfs_format.h index 62053744a0a6..35c08ff54ca0 100644 --- a/fs/xfs/xfs_format.h +++ b/fs/xfs/xfs_format.h @@ -27,6 +27,12 @@ * xfs_log_format.h. Everything else goes here. */ +struct xfs_mount; +struct xfs_trans; +struct xfs_inode; +struct xfs_buf; +struct xfs_ifork; + /* * RealTime Device format definitions */ @@ -123,5 +129,41 @@ typedef struct xfs_dqblk { #define XFS_DQUOT_CRC_OFF offsetof(struct xfs_dqblk, dd_crc) +/* + * Remote symlink format and access functions. + */ +#define XFS_SYMLINK_MAGIC 0x58534c4d /* XSLM */ + +struct xfs_dsymlink_hdr { + __be32 sl_magic; + __be32 sl_offset; + __be32 sl_bytes; + __be32 sl_crc; + uuid_t sl_uuid; + __be64 sl_owner; + __be64 sl_blkno; + __be64 sl_lsn; +}; + +/* + * The maximum pathlen is 1024 bytes. Since the minimum file system + * blocksize is 512 bytes, we can get a max of 3 extents back from + * bmapi when crc headers are taken into account. + */ +#define XFS_SYMLINK_MAPS 3 + +#define XFS_SYMLINK_BUF_SPACE(mp, bufsize) \ + ((bufsize) - (xfs_sb_version_hascrc(&(mp)->m_sb) ? \ + sizeof(struct xfs_dsymlink_hdr) : 0)) + +int xfs_symlink_blocks(struct xfs_mount *mp, int pathlen); +int xfs_symlink_hdr_set(struct xfs_mount *mp, xfs_ino_t ino, uint32_t offset, + uint32_t size, struct xfs_buf *bp); +bool xfs_symlink_hdr_ok(struct xfs_mount *mp, xfs_ino_t ino, uint32_t offset, + uint32_t size, struct xfs_buf *bp); +void xfs_symlink_local_to_remote(struct xfs_trans *tp, struct xfs_buf *bp, + struct xfs_inode *ip, struct xfs_ifork *ifp); + +extern const struct xfs_buf_ops xfs_symlink_buf_ops; #endif /* __XFS_FORMAT_H__ */ |