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[XFS] Allow xfs_bmbt_split() to fallback to the lowspace allocator

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algorithm

If xfs_bmbt_split() cannot find an AG with sufficient free space to
satisfy a full extent btree split then fall back to the lowspace allocator
algorithm.

SGI-PV: 983338

SGI-Modid: xfs-linux-melb:xfs-kern:31359a

Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Signed-off-by: David Chinner <dgc@sgi.com>
This commit is contained in:
Lachlan McIlroy 2008-06-27 13:33:11 +10:00 committed by Niv Sardi
parent b877e3d37d
commit 313b5c767a
1 changed files with 15 additions and 0 deletions
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15
fs/xfs/xfs_bmap_btree.c
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@ -1525,6 +1525,21 @@ xfs_bmbt_split(
XFS_BMBT_TRACE_CURSOR(cur, ERROR);
return error;
}
if (args.fsbno == NULLFSBLOCK && args.minleft) {
/*
* Could not find an AG with enough free space to satisfy
* a full btree split. Try again without minleft and if
* successful activate the lowspace algorithm.
*/
args.fsbno = 0;
args.type = XFS_ALLOCTYPE_FIRST_AG;
args.minleft = 0;
if ((error = xfs_alloc_vextent(&args))) {
XFS_BMBT_TRACE_CURSOR(cur, ERROR);
return error;
}
cur->bc_private.b.flist->xbf_low = 1;
}
if (args.fsbno == NULLFSBLOCK) {
XFS_BMBT_TRACE_CURSOR(cur, EXIT);
*stat = 0;