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authorChris Mason <chris.mason@oracle.com>2012-05-06 07:23:47 -0400
committerChris Mason <chris.mason@oracle.com>2012-05-06 07:23:47 -0400
commitb9fab919b748c7b39c19ff236ed6c5682c266dde (patch)
tree49e5a6f8041a7f0a9be0c1a39cd9088e3faa1df2 /fs/btrfs/extent-tree.c
parentea9947b4395fa34666086b2fa6f686e94903e047 (diff)
downloadlinux-stericsson-b9fab919b748c7b39c19ff236ed6c5682c266dde.tar.gz
Btrfs: avoid sleeping in verify_parent_transid while atomic
verify_parent_transid needs to lock the extent range to make sure no IO is underway, and so it can safely clear the uptodate bits if our checks fail. But, a few callers are using it with spinlocks held. Most of the time, the generation numbers are going to match, and we don't want to switch to a blocking lock just for the error case. This adds an atomic flag to verify_parent_transid, and changes it to return EAGAIN if it needs to block to properly verifiy things. Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/extent-tree.c')
-rw-r--r--fs/btrfs/extent-tree.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 6fc2e6f5aab8..49fd7b66d57b 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -6568,7 +6568,7 @@ static noinline int do_walk_down(struct btrfs_trans_handle *trans,
goto skip;
}
- if (!btrfs_buffer_uptodate(next, generation)) {
+ if (!btrfs_buffer_uptodate(next, generation, 0)) {
btrfs_tree_unlock(next);
free_extent_buffer(next);
next = NULL;