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authorFrederic Weisbecker <fweisbec@gmail.com>2009-08-25 02:44:21 +0200
committerFrederic Weisbecker <fweisbec@gmail.com>2009-09-14 07:18:27 +0200
commitb10ab4c337a600456ed2d9daea0331016f7cdeeb (patch)
tree6e85b1faea80835b5dcab78bf66d51b529711ada /fs/reiserfs
parentae635c0bbd6c10aa62bf5149c6f41add59fbf4d2 (diff)
kill-the-bkl/reiserfs: fix recursive reiserfs lock in reiserfs_mkdir()
reiserfs_mkdir() acquires the reiserfs lock, assuming it has been called from the dir inodes callbacks, without the lock held. But it can also be called from other internal sites such as reiserfs_xattr_init() which already holds the lock. This recursive locking leads to further wrong assumptions. For example, later calls to reiserfs_mutex_lock_safe() won't actually unlock the reiserfs lock the time we acquire a given mutex, creating unexpected lock inversions. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jeff Mahoney <jeffm@suse.com> Cc: Chris Mason <chris.mason@oracle.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Alexander Beregalov <a.beregalov@gmail.com> Cc: Laurent Riffard <laurent.riffard@free.fr>
Diffstat (limited to 'fs/reiserfs')
-rw-r--r--fs/reiserfs/namei.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/fs/reiserfs/namei.c b/fs/reiserfs/namei.c
index b3973c9f0bf..e296ff72a6c 100644
--- a/fs/reiserfs/namei.c
+++ b/fs/reiserfs/namei.c
@@ -732,6 +732,7 @@ static int reiserfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
struct inode *inode;
struct reiserfs_transaction_handle th;
struct reiserfs_security_handle security;
+ int lock_depth;
/* We need blocks for transaction + (user+group)*(quotas for new inode + update of quota for directory owner) */
int jbegin_count =
JOURNAL_PER_BALANCE_CNT * 3 +
@@ -755,7 +756,7 @@ static int reiserfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
return retval;
}
jbegin_count += retval;
- reiserfs_write_lock(dir->i_sb);
+ lock_depth = reiserfs_write_lock_once(dir->i_sb);
retval = journal_begin(&th, dir->i_sb, jbegin_count);
if (retval) {
@@ -805,8 +806,8 @@ static int reiserfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
d_instantiate(dentry, inode);
unlock_new_inode(inode);
retval = journal_end(&th, dir->i_sb, jbegin_count);
- out_failed:
- reiserfs_write_unlock(dir->i_sb);
+out_failed:
+ reiserfs_write_unlock_once(dir->i_sb, lock_depth);
return retval;
}