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authorNaohiro Aota <naohiro.aota@wdc.com>2022-02-18 07:14:19 +0300
committerDavid Sterba <dsterba@suse.com>2022-03-14 15:13:53 +0300
commitca5e4ea0beaec8bc674121838bf8614c089effb9 (patch)
tree4f60e32b593ad628a0b4d4b720a145d197afd6cf /fs/btrfs
parent9f5710bbfd3031dd7ce244fa26fba896d35f5342 (diff)
downloadlinux-ca5e4ea0beaec8bc674121838bf8614c089effb9.tar.xz
btrfs: zoned: mark relocation as writing
There is a hung_task issue with running generic/068 on an SMR device. The hang occurs while a process is trying to thaw the filesystem. The process is trying to take sb->s_umount to thaw the FS. The lock is held by fsstress, which calls btrfs_sync_fs() and is waiting for an ordered extent to finish. However, as the FS is frozen, the ordered extents never finish. Having an ordered extent while the FS is frozen is the root cause of the hang. The ordered extent is initiated from btrfs_relocate_chunk() which is called from btrfs_reclaim_bgs_work(). This commit adds sb_*_write() around btrfs_relocate_chunk() call site. For the usual "btrfs balance" command, we already call it with mnt_want_file() in btrfs_ioctl_balance(). Fixes: 18bb8bbf13c1 ("btrfs: zoned: automatically reclaim zones") CC: stable@vger.kernel.org # 5.13+ Link: https://github.com/naota/linux/issues/56 Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: Naohiro Aota <naohiro.aota@wdc.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/block-group.c8
-rw-r--r--fs/btrfs/volumes.c3
2 files changed, 10 insertions, 1 deletions
diff --git a/fs/btrfs/block-group.c b/fs/btrfs/block-group.c
index 3113f6d7f335..c22d287e020b 100644
--- a/fs/btrfs/block-group.c
+++ b/fs/btrfs/block-group.c
@@ -1522,8 +1522,12 @@ void btrfs_reclaim_bgs_work(struct work_struct *work)
if (!test_bit(BTRFS_FS_OPEN, &fs_info->flags))
return;
- if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE))
+ sb_start_write(fs_info->sb);
+
+ if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) {
+ sb_end_write(fs_info->sb);
return;
+ }
/*
* Long running balances can keep us blocked here for eternity, so
@@ -1531,6 +1535,7 @@ void btrfs_reclaim_bgs_work(struct work_struct *work)
*/
if (!mutex_trylock(&fs_info->reclaim_bgs_lock)) {
btrfs_exclop_finish(fs_info);
+ sb_end_write(fs_info->sb);
return;
}
@@ -1605,6 +1610,7 @@ next:
spin_unlock(&fs_info->unused_bgs_lock);
mutex_unlock(&fs_info->reclaim_bgs_lock);
btrfs_exclop_finish(fs_info);
+ sb_end_write(fs_info->sb);
}
void btrfs_reclaim_bgs(struct btrfs_fs_info *fs_info)
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index fa7fee09e39b..5e3e13d4940b 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -8304,10 +8304,12 @@ static int relocating_repair_kthread(void *data)
target = cache->start;
btrfs_put_block_group(cache);
+ sb_start_write(fs_info->sb);
if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) {
btrfs_info(fs_info,
"zoned: skip relocating block group %llu to repair: EBUSY",
target);
+ sb_end_write(fs_info->sb);
return -EBUSY;
}
@@ -8335,6 +8337,7 @@ out:
btrfs_put_block_group(cache);
mutex_unlock(&fs_info->reclaim_bgs_lock);
btrfs_exclop_finish(fs_info);
+ sb_end_write(fs_info->sb);
return ret;
}