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authorFrederic Weisbecker <fweisbec@gmail.com>2009-05-08 01:05:06 +0200
committerFrederic Weisbecker <fweisbec@gmail.com>2009-09-14 07:18:17 +0200
commitb1c839bb2d8d6f1f6bf48f5c657752b4963f88f8 (patch)
tree7396e1e56cfe544248d0e21374ab10f4edf6de3a /fs/reiserfs
parent26931309a47747fd31b2ef029c29d47794c2d93d (diff)
kill-the-bkl/reiserfs: don't hold the write recursively in reiserfs_lookup()
The write lock can be acquired recursively in reiserfs_lookup(). But we may want to *really* release the lock before possible rescheduling from a reiserfs_lookup() callee. Hence we want to only acquire the lock once (ie: not recursively). [ Impact: prevent from possible false unreleased write lock on sleeping ] 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> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Diffstat (limited to 'fs/reiserfs')
-rw-r--r--fs/reiserfs/namei.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/fs/reiserfs/namei.c b/fs/reiserfs/namei.c
index 27157912863..b3973c9f0bf 100644
--- a/fs/reiserfs/namei.c
+++ b/fs/reiserfs/namei.c
@@ -324,6 +324,7 @@ static struct dentry *reiserfs_lookup(struct inode *dir, struct dentry *dentry,
struct nameidata *nd)
{
int retval;
+ int lock_depth;
struct inode *inode = NULL;
struct reiserfs_dir_entry de;
INITIALIZE_PATH(path_to_entry);
@@ -331,7 +332,13 @@ static struct dentry *reiserfs_lookup(struct inode *dir, struct dentry *dentry,
if (REISERFS_MAX_NAME(dir->i_sb->s_blocksize) < dentry->d_name.len)
return ERR_PTR(-ENAMETOOLONG);
- reiserfs_write_lock(dir->i_sb);
+ /*
+ * Might be called with or without the write lock, must be careful
+ * to not recursively hold it in case we want to release the lock
+ * before rescheduling.
+ */
+ lock_depth = reiserfs_write_lock_once(dir->i_sb);
+
de.de_gen_number_bit_string = NULL;
retval =
reiserfs_find_entry(dir, dentry->d_name.name, dentry->d_name.len,
@@ -341,7 +348,7 @@ static struct dentry *reiserfs_lookup(struct inode *dir, struct dentry *dentry,
inode = reiserfs_iget(dir->i_sb,
(struct cpu_key *)&(de.de_dir_id));
if (!inode || IS_ERR(inode)) {
- reiserfs_write_unlock(dir->i_sb);
+ reiserfs_write_unlock_once(dir->i_sb, lock_depth);
return ERR_PTR(-EACCES);
}
@@ -350,7 +357,7 @@ static struct dentry *reiserfs_lookup(struct inode *dir, struct dentry *dentry,
if (IS_PRIVATE(dir))
inode->i_flags |= S_PRIVATE;
}
- reiserfs_write_unlock(dir->i_sb);
+ reiserfs_write_unlock_once(dir->i_sb, lock_depth);
if (retval == IO_ERROR) {
return ERR_PTR(-EIO);
}