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authorDave Chinner <dgc@sgi.com>2009-03-16 08:29:46 +0100
committerChristoph Hellwig <hch@brick.lst.de>2009-03-16 08:29:46 +0100
commit6cc87645e2a3c28d857b074e90bf88bfcd117afa (patch)
treea93770aa88f1ecde7af8954931e19cef2015bf53 /fs/xfs/xfs_alloc.c
parentcb4c8cc1e92bc68c952e9a81a9fb9736bd8150de (diff)
downloadop-kernel-dev-6cc87645e2a3c28d857b074e90bf88bfcd117afa.zip
op-kernel-dev-6cc87645e2a3c28d857b074e90bf88bfcd117afa.tar.gz
xfs: factor out code to find the longest free extent in the AG
Signed-off-by: Dave Chinner <dgc@sgi.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'fs/xfs/xfs_alloc.c')
-rw-r--r--fs/xfs/xfs_alloc.c26
1 files changed, 21 insertions, 5 deletions
diff --git a/fs/xfs/xfs_alloc.c b/fs/xfs/xfs_alloc.c
index 028e44e..2cf944e 100644
--- a/fs/xfs/xfs_alloc.c
+++ b/fs/xfs/xfs_alloc.c
@@ -1872,6 +1872,25 @@ xfs_alloc_compute_maxlevels(
}
/*
+ * Find the length of the longest extent in an AG.
+ */
+xfs_extlen_t
+xfs_alloc_longest_free_extent(
+ struct xfs_mount *mp,
+ struct xfs_perag *pag)
+{
+ xfs_extlen_t need, delta = 0;
+
+ need = XFS_MIN_FREELIST_PAG(pag, mp);
+ if (need > pag->pagf_flcount)
+ delta = need - pag->pagf_flcount;
+
+ if (pag->pagf_longest > delta)
+ return pag->pagf_longest - delta;
+ return pag->pagf_flcount > 0 || pag->pagf_longest > 0;
+}
+
+/*
* Decide whether to use this allocation group for this allocation.
* If so, fix up the btree freelist's size.
*/
@@ -1923,15 +1942,12 @@ xfs_alloc_fix_freelist(
}
if (!(flags & XFS_ALLOC_FLAG_FREEING)) {
- need = XFS_MIN_FREELIST_PAG(pag, mp);
- delta = need > pag->pagf_flcount ? need - pag->pagf_flcount : 0;
/*
* If it looks like there isn't a long enough extent, or enough
* total blocks, reject it.
*/
- longest = (pag->pagf_longest > delta) ?
- (pag->pagf_longest - delta) :
- (pag->pagf_flcount > 0 || pag->pagf_longest > 0);
+ need = XFS_MIN_FREELIST_PAG(pag, mp);
+ longest = xfs_alloc_longest_free_extent(mp, pag);
if ((args->minlen + args->alignment + args->minalignslop - 1) >
longest ||
((int)(pag->pagf_freeblks + pag->pagf_flcount -
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