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authorChris Mason <chris.mason@oracle.com>2009-02-04 09:12:46 -0500
committerChris Mason <chris.mason@oracle.com>2009-02-04 09:12:46 -0500
commit7b78c170dc4f538cc7ee66f47b3aac3f3974a36c (patch)
treee2301fba4de0f3a04cf4b691f63e2bdf1e8c64d2 /fs
parent12f4daccfc3732280debba8f9ba49720372de831 (diff)
downloadlinux-7b78c170dc4f538cc7ee66f47b3aac3f3974a36c.tar.gz
Btrfs: Only prep for btree deletion balances when nodes are mostly empty
Whenever an item deletion is done, we need to balance all the nodes in the tree to make sure we don't end up with an empty node if a pointer is deleted. This balance prep happens from the root of the tree down so we can drop our locks as we go. reada_for_balance was triggering read-ahead on neighboring nodes even when no balancing was required. This adds an extra check to avoid calling balance_level() and avoid reada_for_balance() when a balance won't be required. Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/btrfs/ctree.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 0d1e3b91e7b..551177c0011 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -1518,18 +1518,19 @@ again:
*/
if (prealloc_block.objectid &&
prealloc_block.offset != b->len) {
- btrfs_set_path_blocking(p);
+ btrfs_release_path(root, p);
btrfs_free_reserved_extent(root,
prealloc_block.objectid,
prealloc_block.offset);
prealloc_block.objectid = 0;
+ goto again;
}
/*
* for higher level blocks, try not to allocate blocks
* with the block and the parent locks held.
*/
- if (level > 1 && !prealloc_block.objectid &&
+ if (level > 0 && !prealloc_block.objectid &&
btrfs_path_lock_waiting(p, level)) {
u32 size = b->len;
u64 hint = b->start;
@@ -1614,7 +1615,9 @@ cow_done:
}
b = p->nodes[level];
slot = p->slots[level];
- } else if (ins_len < 0) {
+ } else if (ins_len < 0 &&
+ btrfs_header_nritems(b) <
+ BTRFS_NODEPTRS_PER_BLOCK(root) / 4) {
int sret;
sret = reada_for_balance(root, p, level);