[BUG] jfs: possible deadlocks

[Evgeniy Dushistov <dushistov@mail.ru>]

I try 2.6.17-rc5-mm2:

====================================
[ BUG: possible deadlock detected! ]
------------------------------------
mount/5587 is trying to acquire lock:
 (&jfs_ip->commit_mutex){--..}, at: [<c02f7096>] mutex_lock+0x12/0x15

but task is already holding lock:
 (&jfs_ip->commit_mutex){--..}, at: [<c02f7096>] mutex_lock+0x12/0x15

which could potentially lead to deadlocks!

other info that might help us debug this:
2 locks held by mount/5587:
 #0:  (&inode->i_mutex){--..}, at: [<c02f7096>] mutex_lock+0x12/0x15
 #1:  (&jfs_ip->commit_mutex){--..}, at: [<c02f7096>] mutex_lock+0x12/0x15

stack backtrace:
 [<c0103095>] show_trace+0x16/0x19
 [<c0103562>] dump_stack+0x1a/0x1f
 [<c012ddd7>] __lockdep_acquire+0x6c6/0x907
 [<c012e063>] lockdep_acquire+0x4b/0x63
 [<c02f6f0c>] __mutex_lock_slowpath+0xa4/0x21c
 [<c02f7096>] mutex_lock+0x12/0x15
 [<c01b99be>] jfs_create+0x90/0x2b8
 [<c0161016>] vfs_create+0x91/0xda
 [<c0163939>] open_namei+0x15a/0x5b0
 [<c015326c>] do_filp_open+0x22/0x39
 [<c01541a8>] do_sys_open+0x40/0xbc
 [<c015424d>] sys_open+0x13/0x15
 [<c02f875d>] sysenter_past_esp+0x56/0x8d

-- 
/Evgeniy

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