ext2: Remove i_mutex use from ext2_quota_write()

We don't need i_mutex in ext2_quota_write() because writes to quota file
are serialized by dqio_mutex anyway. Changes to quota files outside of quota
code are forbidded and enforced by NOATIME and IMMUTABLE bits.

Signed-off-by: Jan Kara <jack@suse.cz>

diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index e0e8f45e9a713894ff4f6370860fe2d21e90bc4d..7c1207c0e0c18fc8e6b2359ff46cec16bcab7bc0 100644 (file)
--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -1434,7 +1434,6 @@ static ssize_t ext2_quota_write(struct super_block *sb, int type,
        struct buffer_head tmp_bh;
        struct buffer_head *bh;
 
-       mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
        while (towrite > 0) {
                tocopy = sb->s_blocksize - offset < towrite ?
                                sb->s_blocksize - offset : towrite;
@@ -1464,16 +1463,13 @@ static ssize_t ext2_quota_write(struct super_block *sb, int type,
                blk++;
        }
 out:
-       if (len == towrite) {
-               mutex_unlock(&inode->i_mutex);
+       if (len == towrite)
                return err;
-       }
        if (inode->i_size < off+len-towrite)
                i_size_write(inode, off+len-towrite);
        inode->i_version++;
        inode->i_mtime = inode->i_ctime = CURRENT_TIME;
        mark_inode_dirty(inode);
-       mutex_unlock(&inode->i_mutex);
        return len - towrite;
 }