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authorFrederic Weisbecker <fweisbec@gmail.com>2009-12-16 23:25:50 +0100
committerFrederic Weisbecker <fweisbec@gmail.com>2009-12-16 23:25:50 +0100
commit47376ceba54600cec4dd9e7c4fe8b98e4269633a (patch)
tree7282806f0095519200729f0d78810f78aa57a974 /include
parentcb1c2e51c5a72f093b5af384b11d2f1c2abd6c13 (diff)
reiserfs: Fix reiserfs lock <-> inode mutex dependency inversion
The reiserfs lock -> inode mutex dependency gets inverted when we relax the lock while walking to the tree. To fix this, use a specialized version of reiserfs_mutex_lock_safe that takes care of mutex subclasses. Then we can grab the inode mutex with I_MUTEX_XATTR subclass without any reiserfs lock dependency. This fixes the following report: [ INFO: possible circular locking dependency detected ] 2.6.32-06793-gf405425-dirty #2 ------------------------------------------------------- mv/18566 is trying to acquire lock: (&REISERFS_SB(s)->lock){+.+.+.}, at: [<c1110708>] reiserfs_write_lock+0x28= /0x40 but task is already holding lock: (&sb->s_type->i_mutex_key#5/3){+.+.+.}, at: [<c111033c>] reiserfs_for_each_xattr+0x10c/0x380 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&sb->s_type->i_mutex_key#5/3){+.+.+.}: [<c104f723>] validate_chain+0xa23/0xf70 [<c1050155>] __lock_acquire+0x4e5/0xa70 [<c105075a>] lock_acquire+0x7a/0xa0 [<c134c76f>] mutex_lock_nested+0x5f/0x2b0 [<c11102b4>] reiserfs_for_each_xattr+0x84/0x380 [<c1110615>] reiserfs_delete_xattrs+0x15/0x50 [<c10ef57f>] reiserfs_delete_inode+0x8f/0x140 [<c10a565c>] generic_delete_inode+0x9c/0x150 [<c10a574d>] generic_drop_inode+0x3d/0x60 [<c10a4667>] iput+0x47/0x50 [<c109cc0b>] do_unlinkat+0xdb/0x160 [<c109cca0>] sys_unlink+0x10/0x20 [<c1002c50>] sysenter_do_call+0x12/0x36 -> #0 (&REISERFS_SB(s)->lock){+.+.+.}: [<c104fc68>] validate_chain+0xf68/0xf70 [<c1050155>] __lock_acquire+0x4e5/0xa70 [<c105075a>] lock_acquire+0x7a/0xa0 [<c134c76f>] mutex_lock_nested+0x5f/0x2b0 [<c1110708>] reiserfs_write_lock+0x28/0x40 [<c1103d6b>] search_by_key+0x1f7b/0x21b0 [<c10e73ef>] search_by_entry_key+0x1f/0x3b0 [<c10e77f7>] reiserfs_find_entry+0x77/0x400 [<c10e81e5>] reiserfs_lookup+0x85/0x130 [<c109a144>] __lookup_hash+0xb4/0x110 [<c109b763>] lookup_one_len+0xb3/0x100 [<c1110350>] reiserfs_for_each_xattr+0x120/0x380 [<c1110615>] reiserfs_delete_xattrs+0x15/0x50 [<c10ef57f>] reiserfs_delete_inode+0x8f/0x140 [<c10a565c>] generic_delete_inode+0x9c/0x150 [<c10a574d>] generic_drop_inode+0x3d/0x60 [<c10a4667>] iput+0x47/0x50 [<c10a1c4f>] dentry_iput+0x6f/0xf0 [<c10a1d74>] d_kill+0x24/0x50 [<c10a396b>] dput+0x5b/0x120 [<c109ca89>] sys_renameat+0x1b9/0x230 [<c109cb28>] sys_rename+0x28/0x30 [<c1002c50>] sysenter_do_call+0x12/0x36 other info that might help us debug this: 2 locks held by mv/18566: #0: (&sb->s_type->i_mutex_key#5/1){+.+.+.}, at: [<c109b6ac>] lock_rename+0xcc/0xd0 #1: (&sb->s_type->i_mutex_key#5/3){+.+.+.}, at: [<c111033c>] reiserfs_for_each_xattr+0x10c/0x380 stack backtrace: Pid: 18566, comm: mv Tainted: G C 2.6.32-06793-gf405425-dirty #2 Call Trace: [<c134b252>] ? printk+0x18/0x1e [<c104e790>] print_circular_bug+0xc0/0xd0 [<c104fc68>] validate_chain+0xf68/0xf70 [<c104c8cb>] ? trace_hardirqs_off+0xb/0x10 [<c1050155>] __lock_acquire+0x4e5/0xa70 [<c105075a>] lock_acquire+0x7a/0xa0 [<c1110708>] ? reiserfs_write_lock+0x28/0x40 [<c134c76f>] mutex_lock_nested+0x5f/0x2b0 [<c1110708>] ? reiserfs_write_lock+0x28/0x40 [<c1110708>] ? reiserfs_write_lock+0x28/0x40 [<c134b60a>] ? schedule+0x27a/0x440 [<c1110708>] reiserfs_write_lock+0x28/0x40 [<c1103d6b>] search_by_key+0x1f7b/0x21b0 [<c1050176>] ? __lock_acquire+0x506/0xa70 [<c1051267>] ? lock_release_non_nested+0x1e7/0x340 [<c1110708>] ? reiserfs_write_lock+0x28/0x40 [<c104e354>] ? trace_hardirqs_on_caller+0x124/0x170 [<c104e3ab>] ? trace_hardirqs_on+0xb/0x10 [<c1042a55>] ? T.316+0x15/0x1a0 [<c1042d2d>] ? sched_clock_cpu+0x9d/0x100 [<c10e73ef>] search_by_entry_key+0x1f/0x3b0 [<c134bf2a>] ? __mutex_unlock_slowpath+0x9a/0x120 [<c104e354>] ? trace_hardirqs_on_caller+0x124/0x170 [<c10e77f7>] reiserfs_find_entry+0x77/0x400 [<c10e81e5>] reiserfs_lookup+0x85/0x130 [<c1042d2d>] ? sched_clock_cpu+0x9d/0x100 [<c109a144>] __lookup_hash+0xb4/0x110 [<c109b763>] lookup_one_len+0xb3/0x100 [<c1110350>] reiserfs_for_each_xattr+0x120/0x380 [<c110ffe0>] ? delete_one_xattr+0x0/0x1c0 [<c1003342>] ? math_error+0x22/0x150 [<c1110708>] ? reiserfs_write_lock+0x28/0x40 [<c1110615>] reiserfs_delete_xattrs+0x15/0x50 [<c1110708>] ? reiserfs_write_lock+0x28/0x40 [<c10ef57f>] reiserfs_delete_inode+0x8f/0x140 [<c10a561f>] ? generic_delete_inode+0x5f/0x150 [<c10ef4f0>] ? reiserfs_delete_inode+0x0/0x140 [<c10a565c>] generic_delete_inode+0x9c/0x150 [<c10a574d>] generic_drop_inode+0x3d/0x60 [<c10a4667>] iput+0x47/0x50 [<c10a1c4f>] dentry_iput+0x6f/0xf0 [<c10a1d74>] d_kill+0x24/0x50 [<c10a396b>] dput+0x5b/0x120 [<c109ca89>] sys_renameat+0x1b9/0x230 [<c1042d2d>] ? sched_clock_cpu+0x9d/0x100 [<c104c8cb>] ? trace_hardirqs_off+0xb/0x10 [<c1042dde>] ? cpu_clock+0x4e/0x60 [<c1350825>] ? do_page_fault+0x155/0x370 [<c1041816>] ? up_read+0x16/0x30 [<c1350825>] ? do_page_fault+0x155/0x370 [<c109cb28>] sys_rename+0x28/0x30 [<c1002c50>] sysenter_do_call+0x12/0x36 Reported-by: Alexander Beregalov <a.beregalov@gmail.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Chris Mason <chris.mason@oracle.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include')
-rw-r--r--include/linux/reiserfs_fs.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/reiserfs_fs.h b/include/linux/reiserfs_fs.h
index a05b4a20768..4351b49e2b1 100644
--- a/include/linux/reiserfs_fs.h
+++ b/include/linux/reiserfs_fs.h
@@ -97,6 +97,15 @@ static inline void reiserfs_mutex_lock_safe(struct mutex *m,
reiserfs_write_lock(s);
}
+static inline void
+reiserfs_mutex_lock_nested_safe(struct mutex *m, unsigned int subclass,
+ struct super_block *s)
+{
+ reiserfs_write_unlock(s);
+ mutex_lock_nested(m, subclass);
+ reiserfs_write_lock(s);
+}
+
/*
* When we schedule, we usually want to also release the write lock,
* according to the previous bkl based locking scheme of reiserfs.