xfs: add CRC checks to remote symlinks

[firefly-linux-kernel-4.4.55.git] / fs / xfs / xfs_symlink.h

diff --git a/fs/xfs/xfs_symlink.h b/fs/xfs/xfs_symlink.h
index 07bdabcc4158f12ead3ee4ab655a7862c18fca4e..b39398d2097cd4ac16e608523630e280fd4d455f 100644 (file)
--- a/fs/xfs/xfs_symlink.h
+++ b/fs/xfs/xfs_symlink.h
@@ -17,16 +17,44 @@
 #ifndef __XFS_SYMLINK_H
 #define __XFS_SYMLINK_H 1
 
+struct xfs_mount;
+struct xfs_trans;
+struct xfs_inode;
+struct xfs_buf;
+struct xfs_ifork;
+struct xfs_name;
+
+#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 2 extents back from
- * bmapi.
+ * 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 2
+#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);
 
 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;
+
 #ifdef __KERNEL__
 
 int xfs_symlink(struct xfs_inode *dp, struct xfs_name *link_name,