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btrfs: set the lockdep class for log tree extent buffers

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[ Upstream commit d3beaa253f ]

These are special extent buffers that get rewound in order to lookup
the state of the tree at a specific point in time.  As such they do not
go through the normal initialization paths that set their lockdep class,
so handle them appropriately when they are created and before they are
locked.

CC: stable@vger.kernel.org # 4.4+
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Josef Bacik 2020-08-10 11:42:31 -04:00 committed by Greg Kroah-Hartman
parent 8ab36da262
commit a6d4a84d56
1 changed files with 5 additions and 1 deletions
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6
fs/btrfs/ctree.c
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@ -1367,6 +1367,8 @@ tree_mod_log_rewind(struct btrfs_fs_info *fs_info, struct btrfs_path *path,
btrfs_tree_read_unlock_blocking(eb);
free_extent_buffer(eb);
btrfs_set_buffer_lockdep_class(btrfs_header_owner(eb_rewin),
eb_rewin, btrfs_header_level(eb_rewin));
btrfs_tree_read_lock(eb_rewin);
__tree_mod_log_rewind(fs_info, eb_rewin, time_seq, tm);
WARN_ON(btrfs_header_nritems(eb_rewin) >
@ -1437,7 +1439,6 @@ get_old_root(struct btrfs_root *root, u64 time_seq)
if (!eb)
return NULL;
btrfs_tree_read_lock(eb);
if (old_root) {
btrfs_set_header_bytenr(eb, eb->start);
btrfs_set_header_backref_rev(eb, BTRFS_MIXED_BACKREF_REV);
@ -1445,6 +1446,9 @@ get_old_root(struct btrfs_root *root, u64 time_seq)
btrfs_set_header_level(eb, old_root->level);
btrfs_set_header_generation(eb, old_generation);
}
btrfs_set_buffer_lockdep_class(btrfs_header_owner(eb), eb,
btrfs_header_level(eb));
btrfs_tree_read_lock(eb);
if (tm)
__tree_mod_log_rewind(fs_info, eb, time_seq, tm);
else