Commit a35eb415 authored by Darrick J. Wong's avatar Darrick J. Wong
Browse files

xfs: simulate per-AG reservations being critically low 



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: default avatarDarrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
parent 4f435ebe

fs/xfs/libxfs/xfs_ag_resv.c

+3 −1
Original line number Diff line number Diff line
@@ -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);

}



/*

fs/xfs/xfs_error.h

+3 −1
Original line number Diff line number Diff line
@@ -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;

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