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| author | Lachlan McIlroy <lachlan@sgi.com> | 2008-06-27 13:32:53 +1000 |
|---|---|---|
| committer | Niv Sardi <xaiki@debian.org> | 2008-07-28 16:59:10 +1000 |
| commit | 4ddd8bb1d25f9cbb345e1f64a56c0f641a787ede (patch) | |
| tree | 297e8fa754cbd910450ff76a9058a2ac6cd07b39 /fs/xfs/xfs_iomap.c | |
| parent | e182f57ac019b034b40d16f3c6d8e86826aecd56 (diff) | |
| download | lwn-4ddd8bb1d25f9cbb345e1f64a56c0f641a787ede.tar.gz lwn-4ddd8bb1d25f9cbb345e1f64a56c0f641a787ede.zip | |
[XFS] use minleft when allocating in xfs_bmbt_split()
The bmap btree split code relies on a previous data extent allocation
(from xfs_bmap_btalloc()) to find an AG that has sufficient space to
perform a full btree split, when inserting the extent. When converting
unwritten extents we don't allocate a data extent so a btree split will be
the first allocation. In this case we need to set minleft so the allocator
will pick an AG that has space to complete the split(s).
SGI-PV: 983338
SGI-Modid: xfs-linux-melb:xfs-kern:31357a
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Signed-off-by: David Chinner <dgc@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_iomap.c')
| -rw-r--r-- | fs/xfs/xfs_iomap.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index 7edcde691d1a..67f22b2b44b3 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -889,6 +889,16 @@ xfs_iomap_write_unwritten( count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count); count_fsb = (xfs_filblks_t)(count_fsb - offset_fsb); + /* + * Reserve enough blocks in this transaction for two complete extent + * btree splits. We may be converting the middle part of an unwritten + * extent and in this case we will insert two new extents in the btree + * each of which could cause a full split. + * + * This reservation amount will be used in the first call to + * xfs_bmbt_split() to select an AG with enough space to satisfy the + * rest of the operation. + */ resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0) << 1; do { |