diff options
author | Frederic Weisbecker <fweisbec@gmail.com> | 2009-12-30 09:12:03 +0300 |
---|---|---|
committer | Frederic Weisbecker <fweisbec@gmail.com> | 2010-01-02 03:57:32 +0300 |
commit | c674905ca74ad0ae5b048afb1ef68663a0d7e987 (patch) | |
tree | 3f269bdda58519c012cf0505e36cee158ec7064b /fs/reiserfs/namei.c | |
parent | 3f14fea6bbd3444dd46a2af3a2e219e792616645 (diff) | |
download | linux-c674905ca74ad0ae5b048afb1ef68663a0d7e987.tar.xz |
reiserfs: Fix unwanted recursive reiserfs lock in reiserfs_unlink()
reiserfs_unlink() may or may not be called under the reiserfs
lock.
But it also takes the reiserfs lock and can then acquire it
recursively which leads to do_journal_begin_r() that fails to
relax the reiserfs lock before grabbing the journal mutex,
creating an unexpected lock inversion.
We need to ensure reiserfs_unlink() won't get the reiserfs lock
recursively using reiserfs_write_lock_once().
This fixes the following warning that precedes a lock inversion
report (reiserfs lock <-> journal mutex).
------------[ cut here ]------------
WARNING: at fs/reiserfs/lock.c:95 reiserfs_lock_check_recursive+0x3a/0x50()
Hardware name: MS-7418
Unwanted recursive reiserfs lock!
Pid: 3208, comm: dbench Not tainted 2.6.32-atom #177
Call Trace:
[<c114327a>] ? reiserfs_lock_check_recursive+0x3a/0x50
[<c114327a>] ? reiserfs_lock_check_recursive+0x3a/0x50
[<c10373a7>] warn_slowpath_common+0x67/0xc0
[<c114327a>] ? reiserfs_lock_check_recursive+0x3a/0x50
[<c1037446>] warn_slowpath_fmt+0x26/0x30
[<c114327a>] reiserfs_lock_check_recursive+0x3a/0x50
[<c113c213>] do_journal_begin_r+0x83/0x360
[<c105eb16>] ? __lock_acquire+0x1296/0x19e0
[<c1142a57>] ? xattr_unlink+0x57/0xb0
[<c113c670>] journal_begin+0x80/0x130
[<c1116d5d>] reiserfs_unlink+0x7d/0x2d0
[<c1142a57>] ? xattr_unlink+0x57/0xb0
[<c1142a57>] ? xattr_unlink+0x57/0xb0
[<c1142a57>] ? xattr_unlink+0x57/0xb0
[<c1142a64>] xattr_unlink+0x64/0xb0
[<c1143169>] delete_one_xattr+0x29/0x100
[<c11427ab>] reiserfs_for_each_xattr+0x10b/0x290
[<c1143140>] ? delete_one_xattr+0x0/0x100
[<c1401ca9>] ? mutex_lock_nested+0x299/0x340
[<c11429aa>] reiserfs_delete_xattrs+0x1a/0x60
[<c11432f9>] ? reiserfs_write_lock_once+0x29/0x50
[<c111ea1f>] reiserfs_delete_inode+0x9f/0x150
[<c11b0d0f>] ? _atomic_dec_and_lock+0x4f/0x70
[<c111e980>] ? reiserfs_delete_inode+0x0/0x150
[<c10c9c32>] generic_delete_inode+0xa2/0x170
[<c10c9d4f>] generic_drop_inode+0x4f/0x70
[<c10c8b07>] iput+0x47/0x50
[<c10c0965>] do_unlinkat+0xd5/0x160
[<c10505c6>] ? up_read+0x16/0x30
[<c1022ab7>] ? do_page_fault+0x187/0x330
[<c1002fd8>] ? restore_all_notrace+0x0/0x18
[<c1022930>] ? do_page_fault+0x0/0x330
[<c105cbe4>] ? trace_hardirqs_on_caller+0x124/0x170
[<c10c0a00>] sys_unlink+0x10/0x20
[<c1002ec4>] sysenter_do_call+0x12/0x32
---[ end trace 2e35d71a6cc69d0c ]---
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Tested-by: Christian Kujau <lists@nerdbynature.de>
Cc: Alexander Beregalov <a.beregalov@gmail.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'fs/reiserfs/namei.c')
-rw-r--r-- | fs/reiserfs/namei.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/fs/reiserfs/namei.c b/fs/reiserfs/namei.c index e296ff72a6cc..9d4dcf0b07cb 100644 --- a/fs/reiserfs/namei.c +++ b/fs/reiserfs/namei.c @@ -921,6 +921,7 @@ static int reiserfs_unlink(struct inode *dir, struct dentry *dentry) struct reiserfs_transaction_handle th; int jbegin_count; unsigned long savelink; + int depth; inode = dentry->d_inode; @@ -932,7 +933,7 @@ static int reiserfs_unlink(struct inode *dir, struct dentry *dentry) JOURNAL_PER_BALANCE_CNT * 2 + 2 + 4 * REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb); - reiserfs_write_lock(dir->i_sb); + depth = reiserfs_write_lock_once(dir->i_sb); retval = journal_begin(&th, dir->i_sb, jbegin_count); if (retval) goto out_unlink; @@ -993,7 +994,7 @@ static int reiserfs_unlink(struct inode *dir, struct dentry *dentry) retval = journal_end(&th, dir->i_sb, jbegin_count); reiserfs_check_path(&path); - reiserfs_write_unlock(dir->i_sb); + reiserfs_write_unlock_once(dir->i_sb, depth); return retval; end_unlink: @@ -1003,7 +1004,7 @@ static int reiserfs_unlink(struct inode *dir, struct dentry *dentry) if (err) retval = err; out_unlink: - reiserfs_write_unlock(dir->i_sb); + reiserfs_write_unlock_once(dir->i_sb, depth); return retval; } |