ext4: start handle at the last possible moment in ext4_rmdir()

Don't start the jbd2 transaction handle until after the directory
entry has been found, to minimize the amount of time that a handle is
held active.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>

1 files changed, 14 insertions, 10 deletions

diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 4a27069d54ad..36a4afd12f39 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -2725,26 +2725,18 @@ static int ext4_rmdir(struct inode *dir, struct dentry *dentry)
         struct inode *inode;
         struct buffer_head *bh;
         struct ext4_dir_entry_2 *de;
-        handle_t *handle;
+        handle_t *handle = NULL;
 
         /* Initialize quotas before so that eventual writes go in
          * separate transaction */
         dquot_initialize(dir);
         dquot_initialize(dentry->d_inode);
 
-        handle = ext4_journal_start(dir, EXT4_HT_DIR,
-                                    EXT4_DELETE_TRANS_BLOCKS(dir->i_sb));
-        if (IS_ERR(handle))
-                return PTR_ERR(handle);
-
         retval = -ENOENT;
         bh = ext4_find_entry(dir, &dentry->d_name, &de, NULL);
         if (!bh)
                 goto end_rmdir;
 
-        if (IS_DIRSYNC(dir))
-                ext4_handle_sync(handle);
-
         inode = dentry->d_inode;
 
         retval = -EIO;
@@ -2755,6 +2747,17 @@ static int ext4_rmdir(struct inode *dir, struct dentry *dentry)
         if (!empty_dir(inode))
                 goto end_rmdir;
 
+        handle = ext4_journal_start(dir, EXT4_HT_DIR,
+                                    EXT4_DELETE_TRANS_BLOCKS(dir->i_sb));
+        if (IS_ERR(handle)) {
+                retval = PTR_ERR(handle);
+                handle = NULL;
+                goto end_rmdir;
+        }
+
+        if (IS_DIRSYNC(dir))
+                ext4_handle_sync(handle);
+
         retval = ext4_delete_entry(handle, dir, de, bh);
         if (retval)
                 goto end_rmdir;
@@ -2776,8 +2779,9 @@ static int ext4_rmdir(struct inode *dir, struct dentry *dentry)
         ext4_mark_inode_dirty(handle, dir);
 
 end_rmdir:
-        ext4_journal_stop(handle);
         brelse(bh);
+        if (handle)
+                ext4_journal_stop(handle);
         return retval;
 }