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xfs: add tracepoints and error injection for deferred extent freeing

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Add a couple of tracepoints for the deferred extent free operation and
a site for injecting errors while finishing the operation.  This makes
it easier to debug deferred ops and test log redo.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Darrick J. Wong 2016-08-03 11:26:33 +10:00 committed by Dave Chinner
parent dc42375d5f
commit ba9e780246
4 changed files with 16 additions and 2 deletions
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7
fs/xfs/libxfs/xfs_alloc.c
View File

@ -2702,6 +2702,13 @@ xfs_free_extent(
ASSERT(len != 0);
trace_xfs_bmap_free_deferred(mp, agno, 0, agbno, len);
if (XFS_TEST_ERROR(false, mp,
XFS_ERRTAG_FREE_EXTENT,
XFS_RANDOM_FREE_EXTENT))
return -EIO;
error = xfs_free_extent_fix_freelist(tp, agno, &agbp);
if (error)
return error;

2
fs/xfs/libxfs/xfs_bmap.c
View File

@ -596,6 +596,8 @@ xfs_bmap_add_free(
new = kmem_zone_alloc(xfs_bmap_free_item_zone, KM_SLEEP);
new->xefi_startblock = bno;
new->xefi_blockcount = (xfs_extlen_t)len;
trace_xfs_bmap_free_defer(mp, XFS_FSB_TO_AGNO(mp, bno), 0,
XFS_FSB_TO_AGBNO(mp, bno), len);
xfs_defer_add(dfops, XFS_DEFER_OPS_TYPE_FREE, &new->xefi_list);
}

4
fs/xfs/xfs_error.h
View File

@ -90,7 +90,8 @@ extern void xfs_verifier_error(struct xfs_buf *bp);
#define XFS_ERRTAG_STRATCMPL_IOERR 19
#define XFS_ERRTAG_DIOWRITE_IOERR 20
#define XFS_ERRTAG_BMAPIFORMAT 21
#define XFS_ERRTAG_MAX 22
#define XFS_ERRTAG_FREE_EXTENT 22
#define XFS_ERRTAG_MAX 23
/*
* Random factors for above tags, 1 means always, 2 means 1/2 time, etc.
@ -117,6 +118,7 @@ extern void xfs_verifier_error(struct xfs_buf *bp);
#define XFS_RANDOM_STRATCMPL_IOERR (XFS_RANDOM_DEFAULT/10)
#define XFS_RANDOM_DIOWRITE_IOERR (XFS_RANDOM_DEFAULT/10)
#define XFS_RANDOM_BMAPIFORMAT XFS_RANDOM_DEFAULT
#define XFS_RANDOM_FREE_EXTENT 1
#ifdef DEBUG
extern int xfs_error_test_active;

5
fs/xfs/xfs_trace.h
View File

@ -2417,9 +2417,12 @@ DEFINE_DEFER_PENDING_EVENT(xfs_defer_pending_cancel);
DEFINE_DEFER_PENDING_EVENT(xfs_defer_pending_finish);
DEFINE_DEFER_PENDING_EVENT(xfs_defer_pending_abort);
DEFINE_PHYS_EXTENT_DEFERRED_EVENT(xfs_defer_phys_extent);
DEFINE_MAP_EXTENT_DEFERRED_EVENT(xfs_defer_map_extent);
#define DEFINE_BMAP_FREE_DEFERRED_EVENT DEFINE_PHYS_EXTENT_DEFERRED_EVENT
DEFINE_BMAP_FREE_DEFERRED_EVENT(xfs_bmap_free_defer);
DEFINE_BMAP_FREE_DEFERRED_EVENT(xfs_bmap_free_deferred);
#endif /* _TRACE_XFS_H */
#undef TRACE_INCLUDE_PATH