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authorLiu Bo <bo.li.liu@oracle.com>2015-07-17 16:49:19 +0800
committerDavid Sterba <dsterba@suse.com>2016-02-23 13:10:10 +0100
commit73beece9ca07c003e0e4f4825b12be167334d4ad (patch)
treeb0575466fc5e0c7a493826963e7a4ffa49e31210 /fs/btrfs/reada.c
parent18558cae0272f8fd9647e69d3fec1565a7949865 (diff)
Btrfs: fix lockdep deadlock warning due to dev_replace
Xfstests btrfs/011 complains about a deadlock warning, [ 1226.649039] ========================================================= [ 1226.649039] [ INFO: possible irq lock inversion dependency detected ] [ 1226.649039] 4.1.0+ #270 Not tainted [ 1226.649039] --------------------------------------------------------- [ 1226.652955] kswapd0/46 just changed the state of lock: [ 1226.652955] (&delayed_node->mutex){+.+.-.}, at: [<ffffffff81458735>] __btrfs_release_delayed_node+0x45/0x1d0 [ 1226.652955] but this lock took another, RECLAIM_FS-unsafe lock in the past: [ 1226.652955] (&fs_info->dev_replace.lock){+.+.+.} and interrupts could create inverse lock ordering between them. [ 1226.652955] other info that might help us debug this: [ 1226.652955] Chain exists of: &delayed_node->mutex --> &found->groups_sem --> &fs_info->dev_replace.lock [ 1226.652955] Possible interrupt unsafe locking scenario: [ 1226.652955] CPU0 CPU1 [ 1226.652955] ---- ---- [ 1226.652955] lock(&fs_info->dev_replace.lock); [ 1226.652955] local_irq_disable(); [ 1226.652955] lock(&delayed_node->mutex); [ 1226.652955] lock(&found->groups_sem); [ 1226.652955] <Interrupt> [ 1226.652955] lock(&delayed_node->mutex); [ 1226.652955] *** DEADLOCK *** Commit 084b6e7c7607 ("btrfs: Fix a lockdep warning when running xfstest.") tried to fix a similar one that has the exactly same warning, but with that, we still run to this. The above lock chain comes from btrfs_commit_transaction ->btrfs_run_delayed_items ... ->__btrfs_update_delayed_inode ... ->__btrfs_cow_block ... ->find_free_extent ->cache_block_group ->load_free_space_cache ->btrfs_readpages ->submit_one_bio ... ->__btrfs_map_block ->btrfs_dev_replace_lock However, with high memory pressure, tasks which hold dev_replace.lock can be interrupted by kswapd and then kswapd is intended to release memory occupied by superblock, inodes and dentries, where we may call evict_inode, and it comes to [ 1226.652955] [<ffffffff81458735>] __btrfs_release_delayed_node+0x45/0x1d0 [ 1226.652955] [<ffffffff81459e74>] btrfs_remove_delayed_node+0x24/0x30 [ 1226.652955] [<ffffffff8140c5fe>] btrfs_evict_inode+0x34e/0x700 delayed_node->mutex may be acquired in __btrfs_release_delayed_node(), and it leads to a ABBA deadlock. To fix this, we can use "blocking rwlock" used in the case of extent_buffer, but things are simpler here since we only needs read's spinlock to blocking lock. With this, btrfs/011 no more produces warnings in dmesg. Signed-off-by: Liu Bo <bo.li.liu@oracle.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/reada.c')
-rw-r--r--fs/btrfs/reada.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/fs/btrfs/reada.c b/fs/btrfs/reada.c
index 619f92963e27..fe3d4c7b6342 100644
--- a/fs/btrfs/reada.c
+++ b/fs/btrfs/reada.c
@@ -396,7 +396,7 @@ static struct reada_extent *reada_find_extent(struct btrfs_root *root,
}
/* insert extent in reada_tree + all per-device trees, all or nothing */
- btrfs_dev_replace_lock(&fs_info->dev_replace);
+ btrfs_dev_replace_lock(&fs_info->dev_replace, 0);
spin_lock(&fs_info->reada_lock);
ret = radix_tree_insert(&fs_info->reada_tree, index, re);
if (ret == -EEXIST) {
@@ -404,12 +404,12 @@ static struct reada_extent *reada_find_extent(struct btrfs_root *root,
BUG_ON(!re_exist);
re_exist->refcnt++;
spin_unlock(&fs_info->reada_lock);
- btrfs_dev_replace_unlock(&fs_info->dev_replace);
+ btrfs_dev_replace_unlock(&fs_info->dev_replace, 0);
goto error;
}
if (ret) {
spin_unlock(&fs_info->reada_lock);
- btrfs_dev_replace_unlock(&fs_info->dev_replace);
+ btrfs_dev_replace_unlock(&fs_info->dev_replace, 0);
goto error;
}
prev_dev = NULL;
@@ -456,12 +456,12 @@ static struct reada_extent *reada_find_extent(struct btrfs_root *root,
BUG_ON(fs_info == NULL);
radix_tree_delete(&fs_info->reada_tree, index);
spin_unlock(&fs_info->reada_lock);
- btrfs_dev_replace_unlock(&fs_info->dev_replace);
+ btrfs_dev_replace_unlock(&fs_info->dev_replace, 0);
goto error;
}
}
spin_unlock(&fs_info->reada_lock);
- btrfs_dev_replace_unlock(&fs_info->dev_replace);
+ btrfs_dev_replace_unlock(&fs_info->dev_replace, 0);
btrfs_put_bbio(bbio);
return re;