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| author | Dave Chinner <dgc@sgi.com> | 2009-03-16 08:29:46 +0100 |
|---|---|---|
| committer | Christoph Hellwig <hch@brick.lst.de> | 2009-03-16 08:29:46 +0100 |
| commit | 6cc87645e2a3c28d857b074e90bf88bfcd117afa (patch) | |
| tree | a93770aa88f1ecde7af8954931e19cef2015bf53 /fs/xfs/xfs_alloc.c | |
| parent | cb4c8cc1e92bc68c952e9a81a9fb9736bd8150de (diff) | |
| download | lwn-6cc87645e2a3c28d857b074e90bf88bfcd117afa.tar.gz lwn-6cc87645e2a3c28d857b074e90bf88bfcd117afa.zip | |
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.c | 26 |
1 files changed, 21 insertions, 5 deletions
diff --git a/fs/xfs/xfs_alloc.c b/fs/xfs/xfs_alloc.c index 028e44e58ea9..2cf944eb796d 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 - |