UBIFS: simplify locking

This patch simplifies lock_[23]_inodes functions. We do not have
to care about locking order, because UBIFS does this for @i_mutex
and this is enough. Thanks to Al Viro for suggesting this.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

1 files changed, 36 insertions, 56 deletions

diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c
index d29b771cce45..f55d523c52bb 100644
--- a/fs/ubifs/dir.c
+++ b/fs/ubifs/dir.c
@@ -482,30 +482,29 @@ static int ubifs_dir_release(struct inode *dir, struct file *file)
 }
 
 /**
- * lock_2_inodes - lock two UBIFS inodes.
+ * lock_2_inodes - a wrapper for locking two UBIFS inodes.
  * @inode1: first inode
  * @inode2: second inode
+ *
+ * We do not implement any tricks to guarantee strict lock ordering, because
+ * VFS has already done it for us on the @i_mutex. So this is just a simple
+ * wrapper function.
  */
 static void lock_2_inodes(struct inode *inode1, struct inode *inode2)
 {
-        if (inode1->i_ino < inode2->i_ino) {
-                mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_2);
-                mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_3);
-        } else {
-                mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2);
-                mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_3);
-        }
+        mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1);
+        mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2);
 }
 
 /**
- * unlock_2_inodes - unlock two UBIFS inodes inodes.
+ * unlock_2_inodes - a wrapper for unlocking two UBIFS inodes.
  * @inode1: first inode
  * @inode2: second inode
  */
 static void unlock_2_inodes(struct inode *inode1, struct inode *inode2)
 {
-        mutex_unlock(&ubifs_inode(inode1)->ui_mutex);
         mutex_unlock(&ubifs_inode(inode2)->ui_mutex);
+        mutex_unlock(&ubifs_inode(inode1)->ui_mutex);
 }
 
 static int ubifs_link(struct dentry *old_dentry, struct inode *dir,
@@ -527,6 +526,8 @@ static int ubifs_link(struct dentry *old_dentry, struct inode *dir,
         dbg_gen("dent '%.*s' to ino %lu (nlink %d) in dir ino %lu",
                 dentry->d_name.len, dentry->d_name.name, inode->i_ino,
                 inode->i_nlink, dir->i_ino);
+        ubifs_assert(mutex_is_locked(&dir->i_mutex));
+        ubifs_assert(mutex_is_locked(&inode->i_mutex));
         err = dbg_check_synced_i_size(inode);
         if (err)
                 return err;
@@ -580,6 +581,8 @@ static int ubifs_unlink(struct inode *dir, struct dentry *dentry)
         dbg_gen("dent '%.*s' from ino %lu (nlink %d) in dir ino %lu",
                 dentry->d_name.len, dentry->d_name.name, inode->i_ino,
                 inode->i_nlink, dir->i_ino);
+        ubifs_assert(mutex_is_locked(&dir->i_mutex));
+        ubifs_assert(mutex_is_locked(&inode->i_mutex));
         err = dbg_check_synced_i_size(inode);
         if (err)
                 return err;
@@ -667,7 +670,8 @@ static int ubifs_rmdir(struct inode *dir, struct dentry *dentry)
 
         dbg_gen("directory '%.*s', ino %lu in dir ino %lu", dentry->d_name.len,
                 dentry->d_name.name, inode->i_ino, dir->i_ino);
-
+        ubifs_assert(mutex_is_locked(&dir->i_mutex));
+        ubifs_assert(mutex_is_locked(&inode->i_mutex));
         err = check_dir_empty(c, dentry->d_inode);
         if (err)
                 return err;
@@ -922,59 +926,30 @@ out_budg:
 }
 
 /**
- * lock_3_inodes - lock three UBIFS inodes for rename.
+ * lock_3_inodes - a wrapper for locking three UBIFS inodes.
  * @inode1: first inode
  * @inode2: second inode
  * @inode3: third inode
  *
- * For 'ubifs_rename()', @inode1 may be the same as @inode2 whereas @inode3 may
- * be null.
+ * This function is used for 'ubifs_rename()' and @inode1 may be the same as
+ * @inode2 whereas @inode3 may be %NULL.
+ *
+ * We do not implement any tricks to guarantee strict lock ordering, because
+ * VFS has already done it for us on the @i_mutex. So this is just a simple
+ * wrapper function.
  */
 static void lock_3_inodes(struct inode *inode1, struct inode *inode2,
                           struct inode *inode3)
 {
-        struct inode *i1, *i2, *i3;
-
-        if (!inode3) {
-                if (inode1 != inode2) {
-                        lock_2_inodes(inode1, inode2);
-                        return;
-                }
-                mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1);
-                return;
-        }
-
-        if (inode1 == inode2) {
-                lock_2_inodes(inode1, inode3);
-                return;
-        }
-
-        /* 3 different inodes */
-        if (inode1 < inode2) {
-                i3 = inode2;
-                if (inode1 < inode3) {
-                        i1 = inode1;
-                        i2 = inode3;
-                } else {
-                        i1 = inode3;
-                        i2 = inode1;
-                }
-        } else {
-                i3 = inode1;
-                if (inode2 < inode3) {
-                        i1 = inode2;
-                        i2 = inode3;
-                } else {
-                        i1 = inode3;
-                        i2 = inode2;
-                }
-        }
-        mutex_lock_nested(&ubifs_inode(i1)->ui_mutex, WB_MUTEX_1);
-        lock_2_inodes(i2, i3);
+        mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1);
+        if (inode2 != inode1)
+                mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2);
+        if (inode3)
+                mutex_lock_nested(&ubifs_inode(inode3)->ui_mutex, WB_MUTEX_3);
 }
 
 /**
- * unlock_3_inodes - unlock three UBIFS inodes for rename.
+ * unlock_3_inodes - a wrapper for unlocking three UBIFS inodes for rename.
  * @inode1: first inode
  * @inode2: second inode
  * @inode3: third inode
@@ -982,11 +957,11 @@ static void lock_3_inodes(struct inode *inode1, struct inode *inode2,
 static void unlock_3_inodes(struct inode *inode1, struct inode *inode2,
                             struct inode *inode3)
 {
-        mutex_unlock(&ubifs_inode(inode1)->ui_mutex);
-        if (inode1 != inode2)
-                mutex_unlock(&ubifs_inode(inode2)->ui_mutex);
         if (inode3)
                 mutex_unlock(&ubifs_inode(inode3)->ui_mutex);
+        if (inode1 != inode2)
+                mutex_unlock(&ubifs_inode(inode2)->ui_mutex);
+        mutex_unlock(&ubifs_inode(inode1)->ui_mutex);
 }
 
 static int ubifs_rename(struct inode *old_dir, struct dentry *old_dentry,
@@ -1020,6 +995,11 @@ static int ubifs_rename(struct inode *old_dir, struct dentry *old_dentry,
                 "dir ino %lu", old_dentry->d_name.len, old_dentry->d_name.name,
                 old_inode->i_ino, old_dir->i_ino, new_dentry->d_name.len,
                 new_dentry->d_name.name, new_dir->i_ino);
+        ubifs_assert(mutex_is_locked(&old_dir->i_mutex));
+        ubifs_assert(mutex_is_locked(&new_dir->i_mutex));
+        if (unlink)
+                ubifs_assert(mutex_is_locked(&new_inode->i_mutex));
+
 
         if (unlink && is_dir) {
                 err = check_dir_empty(c, new_inode);