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xfs: randomly do sparse inode allocations in DEBUG mode

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Sparse inode allocations generally only occur when full inode chunk
allocation fails. This requires some level of filesystem space usage and
fragmentation.

For filesystems formatted with sparse inode chunks enabled, do random
sparse inode chunk allocs when compiled in DEBUG mode to increase test
coverage.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Brian Foster 2015-05-29 09:19:29 +10:00 committed by Dave Chinner
parent 56d1115c9b
commit 1cdadee11f
1 changed files with 13 additions and 2 deletions
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15
fs/xfs/libxfs/xfs_ialloc.c
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@ -607,9 +607,18 @@ xfs_ialloc_ag_alloc(
struct xfs_inobt_rec_incore rec;
struct xfs_perag *pag;
int do_sparse = 0;
#ifdef DEBUG
/* randomly do sparse inode allocations */
if (xfs_sb_version_hassparseinodes(&tp->t_mountp->m_sb))
do_sparse = prandom_u32() & 1;
#endif
memset(&args, 0, sizeof(args));
args.tp = tp;
args.mp = tp->t_mountp;
args.fsbno = NULLFSBLOCK;
/*
* Locking will ensure that we don't have two callers in here
@ -631,6 +640,8 @@ xfs_ialloc_ag_alloc(
agno = be32_to_cpu(agi->agi_seqno);
args.agbno = XFS_AGINO_TO_AGBNO(args.mp, newino) +
args.mp->m_ialloc_blks;
if (do_sparse)
goto sparse_alloc;
if (likely(newino != NULLAGINO &&
(args.agbno < be32_to_cpu(agi->agi_length)))) {
args.fsbno = XFS_AGB_TO_FSB(args.mp, agno, args.agbno);
@ -669,8 +680,7 @@ xfs_ialloc_ag_alloc(
* subsequent requests.
*/
args.minalignslop = 0;
} else
args.fsbno = NULLFSBLOCK;
}
if (unlikely(args.fsbno == NULLFSBLOCK)) {
/*
@ -728,6 +738,7 @@ xfs_ialloc_ag_alloc(
if (xfs_sb_version_hassparseinodes(&args.mp->m_sb) &&
args.mp->m_ialloc_min_blks < args.mp->m_ialloc_blks &&
args.fsbno == NULLFSBLOCK) {
sparse_alloc:
args.type = XFS_ALLOCTYPE_NEAR_BNO;
args.agbno = be32_to_cpu(agi->agi_root);
args.fsbno = XFS_AGB_TO_FSB(args.mp, agno, args.agbno);