From 32e534402ad52e9f35c32be68e25213db722892b Mon Sep 17 00:00:00 2001 From: Filipe Manana Date: Thu, 4 Jul 2019 16:25:00 +0100 Subject: [PATCH] Btrfs: wake up inode cache waiters sooner to reduce waiting time If we need to start an inode caching thread, because none currently exists on disk, we can wake up all waiters as soon as we mark the range starting at root's highest objectid + 1 and ending at BTRFS_LAST_FREE_OBJECTID as free, so that they don't need to wait for the caching thread to start and do some progress. We follow the same approach within the caching thread, since as soon as it finds a free range and marks it as free space in the cache, it wakes up all waiters. So improve this by adding such a wakeup call after marking that initial range as free space. Fixes: a47d6b70e28040 ("Btrfs: setup free ino caching in a more asynchronous way") Reviewed-by: Nikolay Borisov Signed-off-by: Filipe Manana Signed-off-by: David Sterba --- fs/btrfs/inode-map.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fs/btrfs/inode-map.c b/fs/btrfs/inode-map.c index c692c8b6e371..86031cdfc356 100644 --- a/fs/btrfs/inode-map.c +++ b/fs/btrfs/inode-map.c @@ -176,6 +176,7 @@ static void start_caching(struct btrfs_root *root) if (!ret && objectid <= BTRFS_LAST_FREE_OBJECTID) { __btrfs_add_free_space(fs_info, ctl, objectid, BTRFS_LAST_FREE_OBJECTID - objectid + 1); + wake_up(&root->ino_cache_wait); } tsk = kthread_run(caching_kthread, root, "btrfs-ino-cache-%llu",