[XFS] Ondisk format extension for extended attributes (attr2). Basically,

the data/attr forks now grow up/down from either end of the literal area,
rather than dividing the literal area into two chunks and growing both
upward.  Means we can now make much more efficient use of the attribute
space, incl. fitting DMF attributes inline in 256 byte inodes, and large
jumps in dbench3 performance numbers.  It is self enabling, but can be
forced on/off via the attr2/noattr2 mount options.

SGI-PV: 941645
SGI-Modid: xfs-linux:xfs-kern:23835a

Signed-off-by: Nathan Scott <nathans@sgi.com>

1 files changed, 8 insertions, 6 deletions

diff --git a/fs/xfs/xfs_attr_leaf.h b/fs/xfs/xfs_attr_leaf.h
index b99f0491061c..326802f80d54 100644
--- a/fs/xfs/xfs_attr_leaf.h
+++ b/fs/xfs/xfs_attr_leaf.h
@@ -238,23 +238,25 @@ typedef struct xfs_attr_inactive_list {
  *========================================================================*/
 
 /*
- * Internal routines when dirsize < XFS_LITINO(mp).
+ * Internal routines when attribute fork size < XFS_LITINO(mp).
  */
-int     xfs_attr_shortform_create(struct xfs_da_args *args);
-int     xfs_attr_shortform_add(struct xfs_da_args *add);
+void    xfs_attr_shortform_create(struct xfs_da_args *args);
+void    xfs_attr_shortform_add(struct xfs_da_args *args, int forkoff);
 int     xfs_attr_shortform_lookup(struct xfs_da_args *args);
 int     xfs_attr_shortform_getvalue(struct xfs_da_args *args);
 int     xfs_attr_shortform_to_leaf(struct xfs_da_args *args);
-int     xfs_attr_shortform_remove(struct xfs_da_args *remove);
+int     xfs_attr_shortform_remove(struct xfs_da_args *args);
 int     xfs_attr_shortform_list(struct xfs_attr_list_context *context);
 int     xfs_attr_shortform_allfit(struct xfs_dabuf *bp, struct xfs_inode *dp);
+int     xfs_attr_shortform_bytesfit(xfs_inode_t *dp, int bytes);
+
 
 /*
- * Internal routines when dirsize == XFS_LBSIZE(mp).
+ * Internal routines when attribute fork size == XFS_LBSIZE(mp).
  */
 int     xfs_attr_leaf_to_node(struct xfs_da_args *args);
 int     xfs_attr_leaf_to_shortform(struct xfs_dabuf *bp,
-                                          struct xfs_da_args *args);
+                                   struct xfs_da_args *args, int forkoff);
 int     xfs_attr_leaf_clearflag(struct xfs_da_args *args);
 int     xfs_attr_leaf_setflag(struct xfs_da_args *args);
 int     xfs_attr_leaf_flipflags(xfs_da_args_t *args);