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| author | Lachlan McIlroy <lachlan@sgi.com> | 2008-06-27 13:33:03 +1000 |
|---|---|---|
| committer | Niv Sardi <xaiki@debian.org> | 2008-07-28 16:59:11 +1000 |
| commit | b877e3d37dda0154868a3c78f02f38a1ec14ce79 (patch) | |
| tree | 0c654086bf0ed0be90bc2652eb7b67448ae568dc /fs/xfs/xfs_bmap_btree.c | |
| parent | 4ddd8bb1d25f9cbb345e1f64a56c0f641a787ede (diff) | |
| download | linux-b877e3d37dda0154868a3c78f02f38a1ec14ce79.tar.gz | |
[XFS] Restore the lowspace extent allocator algorithm
When free space is running low the extent allocator may choose to allocate an extent from an AG without leaving sufficient space for a btree split when inserting the new extent (see where xfs_bmap_btalloc() sets minleft to 0). In this case the allocator will enable the lowspace algorithm which is supposed to allow further allocations (such as btree splits and newroots) to allocate from sequential AGs. This algorithm has been broken for a long time and this patch restores its behaviour. SGI-PV: 983338 SGI-Modid: xfs-linux-melb:xfs-kern:31358a Signed-off-by: Lachlan McIlroy <lachlan@sgi.com> Signed-off-by: David Chinner <dgc@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_bmap_btree.c')
| -rw-r--r-- | fs/xfs/xfs_bmap_btree.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/fs/xfs/xfs_bmap_btree.c b/fs/xfs/xfs_bmap_btree.c index 3fc09cd8d517..1140cef4ba99 100644 --- a/fs/xfs/xfs_bmap_btree.c +++ b/fs/xfs/xfs_bmap_btree.c @@ -1509,7 +1509,9 @@ xfs_bmbt_split( * block allocation here and corrupt the filesystem. */ args.minleft = xfs_trans_get_block_res(args.tp); - } else + } else if (cur->bc_private.b.flist->xbf_low) + args.type = XFS_ALLOCTYPE_START_BNO; + else args.type = XFS_ALLOCTYPE_NEAR_BNO; args.mod = args.alignment = args.total = args.isfl = args.userdata = args.minalignslop = 0; @@ -2237,7 +2239,9 @@ xfs_bmbt_newroot( #endif args.fsbno = be64_to_cpu(*pp); args.type = XFS_ALLOCTYPE_START_BNO; - } else + } else if (cur->bc_private.b.flist->xbf_low) + args.type = XFS_ALLOCTYPE_START_BNO; + else args.type = XFS_ALLOCTYPE_NEAR_BNO; if ((error = xfs_alloc_vextent(&args))) { XFS_BMBT_TRACE_CURSOR(cur, ERROR); |