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xfs: refactor delalloc accounting in xfs_bmap_add_extent_delay_real

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Account for all changes to the delalloc reservation in da_new, and use a
single call xfs_mod_fdblocks to reserve/free blocks, including always
checking for an error.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Christoph Hellwig 2017-10-17 14:16:25 -07:00 committed by Darrick J. Wong
parent 4dcb886987
commit ca1862b083
1 changed files with 9 additions and 23 deletions
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32
fs/xfs/libxfs/xfs_bmap.c
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@ -1574,7 +1574,6 @@ xfs_bmap_add_extent_delay_real(
int whichfork)
{
struct xfs_bmbt_irec *new = &bma->got;
int diff; /* temp value */
int error; /* error return value */
int i; /* temp state */
xfs_ifork_t *ifp; /* inode fork pointer */
@ -2072,17 +2071,6 @@ xfs_bmap_add_extent_delay_real(
da_new = startblockval(PREV.br_startblock) +
startblockval(RIGHT.br_startblock);
diff = da_new - startblockval(old.br_startblock);
if (bma->cur)
diff += bma->cur->bc_private.b.allocated;
if (diff > 0) {
error = xfs_mod_fdblocks(bma->ip->i_mount,
-((int64_t)diff), false);
ASSERT(!error);
if (error)
goto done;
}
bma->idx++;
break;
@ -2117,19 +2105,17 @@ xfs_bmap_add_extent_delay_real(
goto done;
}
/* adjust for changes in reserved delayed indirect blocks */
if (da_old || da_new) {
temp = da_new;
if (bma->cur)
temp += bma->cur->bc_private.b.allocated;
if (temp < da_old)
xfs_mod_fdblocks(bma->ip->i_mount,
(int64_t)(da_old - temp), false);
if (bma->cur) {
da_new += bma->cur->bc_private.b.allocated;
bma->cur->bc_private.b.allocated = 0;
}
/* clear out the allocated field, done with it now in any case. */
if (bma->cur)
bma->cur->bc_private.b.allocated = 0;
/* adjust for changes in reserved delayed indirect blocks */
if (da_new != da_old) {
ASSERT(state == 0 || da_new < da_old);
error = xfs_mod_fdblocks(mp, (int64_t)(da_old - da_new),
false);
}
xfs_bmap_check_leaf_extents(bma->cur, bma->ip, whichfork);
done: