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xfs: introduce the CoW fork

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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>
This commit is contained in:
Darrick J. Wong
2016-10-03 09:11:32 -07:00
parent 11715a21bc
commit 3993baeb3c
13 changed files with 264 additions and 28 deletions
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15
fs/xfs/libxfs/xfs_rmap.c
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@@ -1263,9 +1263,10 @@ out_cur:
*/
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 @@ xfs_rmap_map_extent(
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 @@ xfs_rmap_unmap_extent(
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 @@ xfs_rmap_convert_extent(
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 @@ xfs_rmap_alloc_extent(
{
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 @@ xfs_rmap_free_extent(
{
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);