BKL-removal: Use unlocked_ioctl for jfs

Convert jfs_ioctl over to not use the BKL. The only potential race
I could see was with two ioctls in parallel changing the flags
and losing the updates. Use the i_mutex to protect against this.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com>

1 files changed, 10 insertions, 3 deletions

diff --git a/fs/jfs/ioctl.c b/fs/jfs/ioctl.c
index dfda12a073e1..fc82eccf408a 100644
--- a/fs/jfs/ioctl.c
+++ b/fs/jfs/ioctl.c
@@ -51,9 +51,9 @@ static long jfs_map_ext2(unsigned long flags, int from)
 }
 
 
-int jfs_ioctl(struct inode * inode, struct file * filp, unsigned int cmd,
-                unsigned long arg)
+long jfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 {
+        struct inode *inode = filp->f_dentry->d_inode;
         struct jfs_inode_info *jfs_inode = JFS_IP(inode);
         unsigned int flags;
 
@@ -82,6 +82,10 @@ int jfs_ioctl(struct inode * inode, struct file * filp, unsigned int cmd,
                 /* Is it quota file? Do not allow user to mess with it */
                 if (IS_NOQUOTA(inode))
                         return -EPERM;
+
+                /* Lock against other parallel changes of flags */
+                mutex_lock(&inode->i_mutex);
+
                 jfs_get_inode_flags(jfs_inode);
                 oldflags = jfs_inode->mode2;
 
@@ -92,8 +96,10 @@ int jfs_ioctl(struct inode * inode, struct file * filp, unsigned int cmd,
                 if ((oldflags & JFS_IMMUTABLE_FL) ||
                         ((flags ^ oldflags) &
                         (JFS_APPEND_FL | JFS_IMMUTABLE_FL))) {
-                        if (!capable(CAP_LINUX_IMMUTABLE))
+                        if (!capable(CAP_LINUX_IMMUTABLE)) {
+                                mutex_unlock(&inode->i_mutex);
                                 return -EPERM;
+                        }
                 }
 
                 flags = flags & JFS_FL_USER_MODIFIABLE;
@@ -101,6 +107,7 @@ int jfs_ioctl(struct inode * inode, struct file * filp, unsigned int cmd,
                 jfs_inode->mode2 = flags;
 
                 jfs_set_inode_flags(inode);
+                mutex_unlock(&inode->i_mutex);
                 inode->i_ctime = CURRENT_TIME_SEC;
                 mark_inode_dirty(inode);
                 return 0;