path: root/fs/btrfs/ctree.h
diff options
authorJosef Bacik <josef@toxicpanda.com>2019-08-01 18:19:37 -0400
committerDavid Sterba <dsterba@suse.com>2019-09-09 14:59:11 +0200
commitd3984c90414a36af581b3b7c0daa87f9de3c0533 (patch)
treec666e8e13aef19b143ac83cfaa96e0f49dec4d23 /fs/btrfs/ctree.h
parentbtrfs: refactor priority_reclaim_metadata_space (diff)
btrfs: introduce an evict flushing state
We have this weird space flushing loop inside inode.c for evict where we'll do the normal LIMIT flush, and then commit the transaction and hope we get our space. This is super janky, and in fact there's really nothing stopping us from using FLUSH_ALL except that we run delayed iputs, which means we could deadlock. So introduce a new flush state for eviction that does the normal priority flushing with all of the states that are safe for eviction. The nice side-effect of this is that we'll try harder for evictions. Previously if (for example generic/269) you had a bunch of other operations happening on the fs you could race with those reservations when committing the transaction, and eventually miss getting a reservation for the evict. With this code we'll have our ticket in place through the transaction commit, so any pinned bytes will go to our pending evictions first. Signed-off-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/ctree.h')
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 4ad4715a7941..b161224b5a0b 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -2536,6 +2536,7 @@ enum btrfs_reserve_flush_enum {
* case, use FLUSH LIMIT