linux-ext4 - Re: [PATCH] ext4: More buffer head reference leaks

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Date:	Wed, 15 Jul 2009 08:53:12 -0700
From:	Curt Wohlgemuth <curtw@...gle.com>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH] ext4: More buffer head reference leaks

I've cleaned up the patch to
   - fix the comment in ext4_alloc_branch()
   - change ext4_add_entry() to remove the gotos and label


       Signed-off-by: Curt Wohlgemuth <curtw@...gle.com>

---
diff -Naur orig/fs/ext4/inode.c new/fs/ext4/inode.c
--- orig/fs/ext4/inode.c	2009-07-14 11:19:01.000000000 -0700
+++ new/fs/ext4/inode.c	2009-07-15 08:12:15.000000000 -0700
@@ -758,8 +758,9 @@
 		BUFFER_TRACE(bh, "call get_create_access");
 		err = ext4_journal_get_create_access(handle, bh);
 		if (err) {
+			/* Don't brelse(bh) here; it's done in
+			 * ext4_journal_forget() below */
 			unlock_buffer(bh);
-			brelse(bh);
 			goto failed;
 		}

diff -Naur orig/fs/ext4/namei.c new/fs/ext4/namei.c
--- orig/fs/ext4/namei.c	2009-07-14 11:19:46.000000000 -0700
+++ new/fs/ext4/namei.c	2009-07-15 08:12:09.000000000 -0700
@@ -1518,8 +1518,12 @@
 			return retval;

 		if (blocks == 1 && !dx_fallback &&
-		    EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_DIR_INDEX))
-			return make_indexed_dir(handle, dentry, inode, bh);
+		    EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_DIR_INDEX)) {
+			retval = make_indexed_dir(handle, dentry, inode, bh);
+			if (retval == -ENOSPC)
+				brelse(bh);
+			return retval;
+		}
 		brelse(bh);
 	}
 	bh = ext4_append(handle, dir, &block, &retval);
@@ -1528,7 +1532,10 @@
 	de = (struct ext4_dir_entry_2 *) bh->b_data;
 	de->inode = 0;
 	de->rec_len = ext4_rec_len_to_disk(blocksize, blocksize);
-	return add_dirent_to_buf(handle, dentry, inode, de, bh);
+	retval = add_dirent_to_buf(handle, dentry, inode, de, bh);
+	if (retval == -ENOSPC)
+		brelse(bh);
+	return retval;
 }

 /*
@@ -1657,7 +1664,8 @@
 	if (!de)
 		goto cleanup;
 	err = add_dirent_to_buf(handle, dentry, inode, de, bh);
-	bh = NULL;
+	if (err != -ENOSPC)
+		bh = NULL;
 	goto cleanup;

 journal_error:
--
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