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| author | Yingping Lu <yingping@sgi.com> | 2006-06-09 14:55:18 +1000 |
|---|---|---|
| committer | Nathan Scott <nathans@sgi.com> | 2006-06-09 14:55:18 +1000 |
| commit | d210a28cd851082cec9b282443f8cc0e6fc09830 (patch) | |
| tree | 77b8c843d4cb7e6095b607570c5fd16702e50592 /fs/xfs/xfs_bmap_btree.c | |
| parent | d3446eac3f50dade2f09ed212b112609ee78fb33 (diff) | |
| download | linux-d210a28cd851082cec9b282443f8cc0e6fc09830.tar.gz | |
[XFS] In actual allocation of file system blocks and freeing extents, the
transaction within each such operation may involve multiple locking of AGF buffer. While the freeing extent function has sorted the extents based on AGF number before entering into transaction, however, when the file system space is very limited, the allocation of space would try every AGF to get space allocated, this could potentially cause out-of-order locking, thus deadlock could happen. This fix mitigates the scarce space for allocation by setting aside a few blocks without reservation, and avoid deadlock by maintaining ascending order of AGF locking. SGI-PV: 947395 SGI-Modid: xfs-linux-melb:xfs-kern:210801a Signed-off-by: Yingping Lu <yingping@sgi.com> Signed-off-by: Nathan Scott <nathans@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_bmap_btree.c')
| -rw-r--r-- | fs/xfs/xfs_bmap_btree.c | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/fs/xfs/xfs_bmap_btree.c b/fs/xfs/xfs_bmap_btree.c index bea44709afbe..3b6dfc9b53af 100644 --- a/fs/xfs/xfs_bmap_btree.c +++ b/fs/xfs/xfs_bmap_btree.c @@ -1569,12 +1569,11 @@ xfs_bmbt_split( lbno = XFS_DADDR_TO_FSB(args.mp, XFS_BUF_ADDR(lbp)); left = XFS_BUF_TO_BMBT_BLOCK(lbp); args.fsbno = cur->bc_private.b.firstblock; + args.firstblock = args.fsbno; if (args.fsbno == NULLFSBLOCK) { args.fsbno = lbno; args.type = XFS_ALLOCTYPE_START_BNO; - } else if (cur->bc_private.b.flist->xbf_low) - args.type = XFS_ALLOCTYPE_FIRST_AG; - else + } else args.type = XFS_ALLOCTYPE_NEAR_BNO; args.mod = args.minleft = args.alignment = args.total = args.isfl = args.userdata = args.minalignslop = 0; @@ -2356,6 +2355,7 @@ xfs_bmbt_newroot( args.userdata = args.minalignslop = 0; args.minlen = args.maxlen = args.prod = 1; args.wasdel = cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL; + args.firstblock = args.fsbno; if (args.fsbno == NULLFSBLOCK) { #ifdef DEBUG if ((error = xfs_btree_check_lptr(cur, INT_GET(*pp, ARCH_CONVERT), level))) { @@ -2365,9 +2365,7 @@ xfs_bmbt_newroot( #endif args.fsbno = INT_GET(*pp, ARCH_CONVERT); args.type = XFS_ALLOCTYPE_START_BNO; - } else if (args.wasdel) - args.type = XFS_ALLOCTYPE_FIRST_AG; - else + } else args.type = XFS_ALLOCTYPE_NEAR_BNO; if ((error = xfs_alloc_vextent(&args))) { XFS_BMBT_TRACE_CURSOR(cur, ERROR); |