Split buffer's b_fspriv field

By splitting the b_fspriv field into two different fields (b_log_item
and b_li_list). It's possible to get rid of an old ABI workaround, by
using the new b_log_item field to store xfs_buf_log_item separated from
the log items attached to the buffer, which will be linked in the new
b_li_list field.

This way, there is no more need to reorder the log items list to place
the buf_log_item at the beginning of the list, simplifying a bit the
logic to handle buffer IO.

This also opens the possibility to change buffer's log items list into a
proper list_head.

b_log_item field is still defined as a void *, because it is still used
by the log buffers to store xlog_in_core structures, and there is no
need to add an extra field on xfs_buf just for xlog_in_core.

Signed-off-by: Carlos Maiolino <cmaiolino@redhat.com>
Reviewed-by: Bill O'Donnell <billodo@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
[darrick: minor style changes]
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index c9e40d4fc939..8a3ff6343d91 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -2272,7 +2272,7 @@ xfs_ifree_cluster(
 		 * stale first, we will not attempt to lock them in the loop
 		 * below as the XFS_ISTALE flag will be set.
 		 */
-		lip = bp->b_fspriv;
+		lip = bp->b_li_list;
 		while (lip) {
 			if (lip->li_type == XFS_LI_INODE) {
 				iip = (xfs_inode_log_item_t *)lip;
@@ -3649,7 +3649,7 @@ xfs_iflush_int(
 	/* generate the checksum. */
 	xfs_dinode_calc_crc(mp, dip);
 
-	ASSERT(bp->b_fspriv != NULL);
+	ASSERT(bp->b_li_list != NULL);
 	ASSERT(bp->b_iodone != NULL);
 	return 0;