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xfs: simulate per-AG reservations being critically low

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Create an error injection point that enables us to simulate being
critically low on per-AG block reservations.  This should enable us to
simulate this specific ENOSPC condition so that we can test falling back
to a regular file copy.

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 09:11:51 -07:00
parent 4f435ebe7d
commit a35eb41519
2 changed files with 6 additions and 2 deletions
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4
fs/xfs/libxfs/xfs_ag_resv.c
View file

@ -109,7 +109,9 @@ xfs_ag_resv_critical(
trace_xfs_ag_resv_critical(pag, type, avail);
/* Critically low if less than 10% or max btree height remains. */
return avail < orig / 10 || avail < XFS_BTREE_MAXLEVELS;
return XFS_TEST_ERROR(avail < orig / 10 || avail < XFS_BTREE_MAXLEVELS,
pag->pag_mount, XFS_ERRTAG_AG_RESV_CRITICAL,
XFS_RANDOM_AG_RESV_CRITICAL);
}
/*

4
fs/xfs/xfs_error.h
View file

@ -95,7 +95,8 @@ extern void xfs_verifier_error(struct xfs_buf *bp);
#define XFS_ERRTAG_REFCOUNT_CONTINUE_UPDATE 24
#define XFS_ERRTAG_REFCOUNT_FINISH_ONE 25
#define XFS_ERRTAG_BMAP_FINISH_ONE 26
#define XFS_ERRTAG_MAX 27
#define XFS_ERRTAG_AG_RESV_CRITICAL 27
#define XFS_ERRTAG_MAX 28
/*
* Random factors for above tags, 1 means always, 2 means 1/2 time, etc.
@ -127,6 +128,7 @@ extern void xfs_verifier_error(struct xfs_buf *bp);
#define XFS_RANDOM_REFCOUNT_CONTINUE_UPDATE 1
#define XFS_RANDOM_REFCOUNT_FINISH_ONE 1
#define XFS_RANDOM_BMAP_FINISH_ONE 1
#define XFS_RANDOM_AG_RESV_CRITICAL 4
#ifdef DEBUG
extern int xfs_error_test_active;