xfs: exact busy extent tracking
Update the extent tree in case we have to reuse a busy extent, so that it
always is kept uptodate. This is done by replacing the busy list searches
with a new xfs_alloc_busy_reuse helper, which updates the busy extent tree
in case of a reuse. This allows us to allow reusing metadata extents
unconditionally, and thus avoid log forces especially for allocation btree
blocks.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>
diff --git a/fs/xfs/xfs_alloc_btree.c b/fs/xfs/xfs_alloc_btree.c
index bcfe92f..8b469d5 100644
--- a/fs/xfs/xfs_alloc_btree.c
+++ b/fs/xfs/xfs_alloc_btree.c
@@ -94,8 +94,8 @@
*stat = 0;
return 0;
}
- if (xfs_alloc_busy_search(cur->bc_mp, cur->bc_private.a.agno, bno, 1))
- xfs_trans_set_sync(cur->bc_tp);
+
+ xfs_alloc_busy_reuse(cur->bc_mp, cur->bc_private.a.agno, bno, 1, false);
xfs_trans_agbtree_delta(cur->bc_tp, 1);
new->s = cpu_to_be32(bno);
@@ -120,17 +120,6 @@
if (error)
return error;
- /*
- * Since blocks move to the free list without the coordination used in
- * xfs_bmap_finish, we can't allow block to be available for
- * reallocation and non-transaction writing (user data) until we know
- * that the transaction that moved it to the free list is permanently
- * on disk. We track the blocks by declaring these blocks as "busy";
- * the busy list is maintained on a per-ag basis and each transaction
- * records which entries should be removed when the iclog commits to
- * disk. If a busy block is allocated, the iclog is pushed up to the
- * LSN that freed the block.
- */
xfs_alloc_busy_insert(cur->bc_tp, be32_to_cpu(agf->agf_seqno), bno, 1);
xfs_trans_agbtree_delta(cur->bc_tp, -1);
return 0;