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(parent: 9f95cff) | patch
Btrfs: fix possible deadlock when opening a seed device
authorLi Zefan <lizf@cn.fujitsu.com>
Wed, 7 Dec 2011 03:38:24 +0000 (11:38 +0800)
committerLi Zefan <lizf@cn.fujitsu.com>
Wed, 11 Jan 2012 02:26:54 +0000 (10:26 +0800)
commite1bf2a94fa43ddb25b6f688e3aac7dc8e6388925
tree5acc05bae14070f2dad3433a1482fe3a7bab0744tree | snapshot
parent9f95cff1b84b8db48d63da89a323372e1a6898a2commit | diff
Btrfs: fix possible deadlock when opening a seed device

The correct lock order is uuid_mutex -> volume_mutex -> chunk_mutex,
but when we mount a filesystem which has backing seed devices, we have
this lock chain:

    open_ctree()
        lock(chunk_mutex);
        read_chunk_tree();
            read_one_dev();
                open_seed_devices();
                    lock(uuid_mutex);

and then we hit a lockdep splat.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
fs/btrfs/disk-io.c diff | blob | history
fs/btrfs/volumes.c diff | blob | history
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