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btrfs: don't block if we can't acquire the reclaim lock 

If we can't acquire the reclaim_bgs_lock on block group reclaim, we
block until it is free. This can potentially stall for a long time.

While reclaim of block groups is necessary for a good user experience on
a zoned file system, there still is no need to block as it is best
effort only, just like when we're deleting unused block groups.

CC: stable@vger.kernel.org # 5.13
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Johannes Thumshirn 2021-07-06 01:32:38 +09:00 committed by David Sterba
parent abb99cfdaf
commit 9cc0b837e1
1 changed files with 9 additions and 1 deletions
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10
fs/btrfs/block-group.c
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@ -1498,7 +1498,15 @@ void btrfs_reclaim_bgs_work(struct work_struct *work)
if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE))
return; return;
mutex_lock(&fs_info->reclaim_bgs_lock); /*
* Long running balances can keep us blocked here for eternity, so
* simply skip reclaim if we're unable to get the mutex.
*/
if (!mutex_trylock(&fs_info->reclaim_bgs_lock)) {
btrfs_exclop_finish(fs_info);
return;
}
spin_lock(&fs_info->unused_bgs_lock); spin_lock(&fs_info->unused_bgs_lock);
while (!list_empty(&fs_info->reclaim_bgs)) { while (!list_empty(&fs_info->reclaim_bgs)) {
u64 zone_unusable; u64 zone_unusable;