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xfs: add bmapi nodiscard flag

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Freed extents are unconditionally discarded when online discard is
enabled. Define XFS_BMAPI_NODISCARD to allow callers to bypass
discards when unnecessary. For example, this will be useful for
eofblocks trimming.

This patch does not change behavior.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Brian Foster
2018-05-09 08:45:04 -07:00
committed by Darrick J. Wong
parent e6631f8554
commit fcb762f5de
7 changed files with 87 additions and 18 deletions
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10
fs/xfs/libxfs/xfs_alloc.c
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@@ -3009,18 +3009,20 @@ out:
* after fixing up the freelist.
*/
int /* error */
xfs_free_extent(
__xfs_free_extent(
struct xfs_trans *tp, /* transaction pointer */
xfs_fsblock_t bno, /* starting block number of extent */
xfs_extlen_t len, /* length of extent */
struct xfs_owner_info *oinfo, /* extent owner */
enum xfs_ag_resv_type type) /* block reservation type */
enum xfs_ag_resv_type type, /* block reservation type */
bool skip_discard)
{
struct xfs_mount *mp = tp->t_mountp;
struct xfs_buf *agbp;
xfs_agnumber_t agno = XFS_FSB_TO_AGNO(mp, bno);
xfs_agblock_t agbno = XFS_FSB_TO_AGBNO(mp, bno);
int error;
unsigned int busy_flags = 0;
ASSERT(len != 0);
ASSERT(type != XFS_AG_RESV_AGFL);
@@ -3044,7 +3046,9 @@ xfs_free_extent(
if (error)
goto err;
xfs_extent_busy_insert(tp, agno, agbno, len, 0);
if (skip_discard)
busy_flags |= XFS_EXTENT_BUSY_SKIP_DISCARD;
xfs_extent_busy_insert(tp, agno, agbno, len, busy_flags);
return 0;
err: