diff options
| author | Josef Bacik <josef@toxicpanda.com> | 2018-11-21 22:03:12 +0300 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2019-02-25 16:13:35 +0300 |
| commit | 8a1bbe1d5cba415c771fe5ff68b83b93701c1d7f (patch) | |
| tree | b92b2b2f52ec69e177df6d227f975152fe4ed1b9 /fs/btrfs | |
| parent | 5df1136363cabc4d3f92fc91e3f92bd6a5eebd27 (diff) | |
| download | linux-8a1bbe1d5cba415c771fe5ff68b83b93701c1d7f.tar.xz | |
btrfs: be more explicit about allowed flush states
For FLUSH_LIMIT flushers we really can only allocate chunks and flush
delayed inode items, everything else is problematic. I added a bunch of
new states and it lead to weirdness in the FLUSH_LIMIT case because I
forgot about how it worked. So instead explicitly declare the states
that are ok for flushing with FLUSH_LIMIT and use that for our state
machine. Then as we add new things that are safe we can just add them
to this list.
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs')
| -rw-r--r-- | fs/btrfs/extent-tree.c | 22 |
1 files changed, 11 insertions, 11 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index cb97ada7f410..3c9ae2a0c0be 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -5143,12 +5143,18 @@ void btrfs_init_async_reclaim_work(struct work_struct *work) INIT_WORK(work, btrfs_async_reclaim_metadata_space); } +static const enum btrfs_flush_state priority_flush_states[] = { + FLUSH_DELAYED_ITEMS_NR, + FLUSH_DELAYED_ITEMS, + ALLOC_CHUNK, +}; + static void priority_reclaim_metadata_space(struct btrfs_fs_info *fs_info, struct btrfs_space_info *space_info, struct reserve_ticket *ticket) { u64 to_reclaim; - int flush_state = FLUSH_DELAYED_ITEMS_NR; + int flush_state; spin_lock(&space_info->lock); to_reclaim = btrfs_calc_reclaim_metadata_size(fs_info, space_info, @@ -5159,8 +5165,10 @@ static void priority_reclaim_metadata_space(struct btrfs_fs_info *fs_info, } spin_unlock(&space_info->lock); + flush_state = 0; do { - flush_space(fs_info, space_info, to_reclaim, flush_state); + flush_space(fs_info, space_info, to_reclaim, + priority_flush_states[flush_state]); flush_state++; spin_lock(&space_info->lock); if (ticket->bytes == 0) { @@ -5168,15 +5176,7 @@ static void priority_reclaim_metadata_space(struct btrfs_fs_info *fs_info, return; } spin_unlock(&space_info->lock); - - /* - * Priority flushers can't wait on delalloc without - * deadlocking. - */ - if (flush_state == FLUSH_DELALLOC || - flush_state == FLUSH_DELALLOC_WAIT) - flush_state = ALLOC_CHUNK; - } while (flush_state < COMMIT_TRANS); + } while (flush_state < ARRAY_SIZE(priority_flush_states)); } static int wait_reserve_ticket(struct btrfs_fs_info *fs_info, |