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17 May 2024, 11:00:25 UTC
Revision 90c711ab380d633bf85249bd5d819edb601feda7 authored by Zygo Blaxell on 13 June 2016, 03:39:58 UTC, committed by David Sterba on 17 June 2016, 16:32:40 UTC 
btrfs: avoid blocking open_ctree from cleaner_kthread
 
This fixes a problem introduced in commit 2f3165ecf103599f82bf0ea254039db335fb5005
"btrfs: don't force mounts to wait for cleaner_kthread to delete one or more subvolumes".

open_ctree eventually calls btrfs_replay_log which in turn calls
btrfs_commit_super which tries to lock the cleaner_mutex, causing a
recursive mutex deadlock during mount.

Instead of playing whack-a-mole trying to keep up with all the
functions that may want to lock cleaner_mutex, put all the cleaner_mutex
lockers back where they were, and attack the problem more directly:
keep cleaner_kthread asleep until the filesystem is mounted.

When filesystems are mounted read-only and later remounted read-write,
open_ctree did not set fs_info->open and neither does anything else.
Set this flag in btrfs_remount so that neither btrfs_delete_unused_bgs
nor cleaner_kthread get confused by the common case of "/" filesystem
read-only mount followed by read-write remount.

Signed-off-by: Zygo Blaxell <ce3g8jdj@umail.furryterror.org>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
1 parent 3b6571c
History
Tip revision: 90c711ab380d633bf85249bd5d819edb601feda7 authored by Zygo Blaxell on 13 June 2016, 03:39:58 UTC
btrfs: avoid blocking open_ctree from cleaner_kthread
Tip revision: 90c711a
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