xfs: introduce the CoW fork
Introduce a new in-core fork for storing copy-on-write delalloc
reservations and allocated extents that are in the process of being
written out.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
diff --git a/fs/xfs/libxfs/xfs_rmap.c b/fs/xfs/libxfs/xfs_rmap.c
index 73d0540..1c40b85 100644
--- a/fs/xfs/libxfs/xfs_rmap.c
+++ b/fs/xfs/libxfs/xfs_rmap.c
@@ -1263,9 +1263,10 @@
*/
static bool
xfs_rmap_update_is_needed(
- struct xfs_mount *mp)
+ struct xfs_mount *mp,
+ int whichfork)
{
- return xfs_sb_version_hasrmapbt(&mp->m_sb);
+ return xfs_sb_version_hasrmapbt(&mp->m_sb) && whichfork != XFS_COW_FORK;
}
/*
@@ -1311,7 +1312,7 @@
int whichfork,
struct xfs_bmbt_irec *PREV)
{
- if (!xfs_rmap_update_is_needed(mp))
+ if (!xfs_rmap_update_is_needed(mp, whichfork))
return 0;
return __xfs_rmap_add(mp, dfops, XFS_RMAP_MAP, ip->i_ino,
@@ -1327,7 +1328,7 @@
int whichfork,
struct xfs_bmbt_irec *PREV)
{
- if (!xfs_rmap_update_is_needed(mp))
+ if (!xfs_rmap_update_is_needed(mp, whichfork))
return 0;
return __xfs_rmap_add(mp, dfops, XFS_RMAP_UNMAP, ip->i_ino,
@@ -1343,7 +1344,7 @@
int whichfork,
struct xfs_bmbt_irec *PREV)
{
- if (!xfs_rmap_update_is_needed(mp))
+ if (!xfs_rmap_update_is_needed(mp, whichfork))
return 0;
return __xfs_rmap_add(mp, dfops, XFS_RMAP_CONVERT, ip->i_ino,
@@ -1362,7 +1363,7 @@
{
struct xfs_bmbt_irec bmap;
- if (!xfs_rmap_update_is_needed(mp))
+ if (!xfs_rmap_update_is_needed(mp, XFS_DATA_FORK))
return 0;
bmap.br_startblock = XFS_AGB_TO_FSB(mp, agno, bno);
@@ -1386,7 +1387,7 @@
{
struct xfs_bmbt_irec bmap;
- if (!xfs_rmap_update_is_needed(mp))
+ if (!xfs_rmap_update_is_needed(mp, XFS_DATA_FORK))
return 0;
bmap.br_startblock = XFS_AGB_TO_FSB(mp, agno, bno);