1 files changed, 29 insertions, 21 deletions

diff --git a/fs/jfs/namei.c b/fs/jfs/namei.c
index a6a8c16c872c..41c204771262 100644
--- a/fs/jfs/namei.c
+++ b/fs/jfs/namei.c
@@ -104,8 +104,8 @@ static int jfs_create(struct inode *dip, struct dentry *dentry, int mode,
 
         tid = txBegin(dip->i_sb, 0);
 
-        mutex_lock(&JFS_IP(dip)->commit_mutex);
-        mutex_lock(&JFS_IP(ip)->commit_mutex);
+        mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
+        mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
 
         rc = jfs_init_acl(tid, ip, dip);
         if (rc)
@@ -238,8 +238,8 @@ static int jfs_mkdir(struct inode *dip, struct dentry *dentry, int mode)
 
         tid = txBegin(dip->i_sb, 0);
 
-        mutex_lock(&JFS_IP(dip)->commit_mutex);
-        mutex_lock(&JFS_IP(ip)->commit_mutex);
+        mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
+        mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
 
         rc = jfs_init_acl(tid, ip, dip);
         if (rc)
@@ -365,8 +365,8 @@ static int jfs_rmdir(struct inode *dip, struct dentry *dentry)
 
         tid = txBegin(dip->i_sb, 0);
 
-        mutex_lock(&JFS_IP(dip)->commit_mutex);
-        mutex_lock(&JFS_IP(ip)->commit_mutex);
+        mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
+        mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
 
         iplist[0] = dip;
         iplist[1] = ip;
@@ -483,12 +483,12 @@ static int jfs_unlink(struct inode *dip, struct dentry *dentry)
         if ((rc = get_UCSname(&dname, dentry)))
                 goto out;
 
-        IWRITE_LOCK(ip);
+        IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
 
         tid = txBegin(dip->i_sb, 0);
 
-        mutex_lock(&JFS_IP(dip)->commit_mutex);
-        mutex_lock(&JFS_IP(ip)->commit_mutex);
+        mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
+        mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
 
         iplist[0] = dip;
         iplist[1] = ip;
@@ -802,8 +802,8 @@ static int jfs_link(struct dentry *old_dentry,
 
         tid = txBegin(ip->i_sb, 0);
 
-        mutex_lock(&JFS_IP(dir)->commit_mutex);
-        mutex_lock(&JFS_IP(ip)->commit_mutex);
+        mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
+        mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
 
         /*
          * scan parent directory for entry/freespace
@@ -913,8 +913,8 @@ static int jfs_symlink(struct inode *dip, struct dentry *dentry,
 
         tid = txBegin(dip->i_sb, 0);
 
-        mutex_lock(&JFS_IP(dip)->commit_mutex);
-        mutex_lock(&JFS_IP(ip)->commit_mutex);
+        mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
+        mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
 
         rc = jfs_init_security(tid, ip, dip);
         if (rc)
@@ -1127,7 +1127,7 @@ static int jfs_rename(struct inode *old_dir, struct dentry *old_dentry,
                         goto out3;
                 }
         } else if (new_ip) {
-                IWRITE_LOCK(new_ip);
+                IWRITE_LOCK(new_ip, RDWRLOCK_NORMAL);
                 /* Init inode for quota operations. */
                 DQUOT_INIT(new_ip);
         }
@@ -1137,13 +1137,21 @@ static int jfs_rename(struct inode *old_dir, struct dentry *old_dentry,
          */
         tid = txBegin(new_dir->i_sb, 0);
 
-        mutex_lock(&JFS_IP(new_dir)->commit_mutex);
-        mutex_lock(&JFS_IP(old_ip)->commit_mutex);
+        /*
+         * How do we know the locking is safe from deadlocks?
+         * The vfs does the hard part for us.  Any time we are taking nested
+         * commit_mutexes, the vfs already has i_mutex held on the parent.
+         * Here, the vfs has already taken i_mutex on both old_dir and new_dir.
+         */
+        mutex_lock_nested(&JFS_IP(new_dir)->commit_mutex, COMMIT_MUTEX_PARENT);
+        mutex_lock_nested(&JFS_IP(old_ip)->commit_mutex, COMMIT_MUTEX_CHILD);
         if (old_dir != new_dir)
-                mutex_lock(&JFS_IP(old_dir)->commit_mutex);
+                mutex_lock_nested(&JFS_IP(old_dir)->commit_mutex,
+                                  COMMIT_MUTEX_SECOND_PARENT);
 
         if (new_ip) {
-                mutex_lock(&JFS_IP(new_ip)->commit_mutex);
+                mutex_lock_nested(&JFS_IP(new_ip)->commit_mutex,
+                                  COMMIT_MUTEX_VICTIM);
                 /*
                  * Change existing directory entry to new inode number
                  */
@@ -1357,8 +1365,8 @@ static int jfs_mknod(struct inode *dir, struct dentry *dentry,
 
         tid = txBegin(dir->i_sb, 0);
 
-        mutex_lock(&JFS_IP(dir)->commit_mutex);
-        mutex_lock(&JFS_IP(ip)->commit_mutex);
+        mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
+        mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
 
         rc = jfs_init_acl(tid, ip, dir);
         if (rc)
@@ -1495,7 +1503,7 @@ struct dentry *jfs_get_parent(struct dentry *dentry)
         return parent;
 }
 
-struct inode_operations jfs_dir_inode_operations = {
+const struct inode_operations jfs_dir_inode_operations = {
         .create         = jfs_create,
         .lookup         = jfs_lookup,
         .link           = jfs_link,