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xfs: allocate sparse inode chunks on full chunk allocation failure

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xfs_ialloc_ag_alloc() makes several attempts to allocate a full inode
chunk. If all else fails, reduce the allocation to the sparse length and
alignment and attempt to allocate a sparse inode chunk.

If sparse chunk allocation succeeds, check whether an inobt record
already exists that can track the chunk. If so, inherit and update the
existing record. Otherwise, insert a new record for the sparse chunk.

Create helpers to align sparse chunk inode records and insert or update
existing records in the inode btrees. The xfs_inobt_insert_sprec()
helper implements the merge or update semantics required for sparse
inode records with respect to both the inobt and finobt. To update the
inobt, either insert a new record or merge with an existing record. To
update the finobt, use the updated inobt record to either insert or
replace an existing record.

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 09:18:32 +10:00 • committed by Dave Chinner
parent 4148c347a4
commit 56d1115c9b
4 changed files with 401 additions and 14 deletions
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31
fs/xfs/libxfs/xfs_ialloc_btree.c
View file

@ -478,3 +478,34 @@ xfs_inobt_irec_to_allocmask(
return bitmap;
}
#if defined(DEBUG) || defined(XFS_WARN)
/*
* Verify that an in-core inode record has a valid inode count.
*/
int
xfs_inobt_rec_check_count(
struct xfs_mount *mp,
struct xfs_inobt_rec_incore *rec)
{
int inocount = 0;
int nextbit = 0;
uint64_t allocbmap;
int wordsz;
wordsz = sizeof(allocbmap) / sizeof(unsigned int);
allocbmap = xfs_inobt_irec_to_allocmask(rec);
nextbit = xfs_next_bit((uint *) &allocbmap, wordsz, nextbit);
while (nextbit != -1) {
inocount++;
nextbit = xfs_next_bit((uint *) &allocbmap, wordsz,
nextbit + 1);
}
if (inocount != rec->ir_count)
return -EFSCORRUPTED;
return 0;
}
#endif /* DEBUG */