linux-kernel - [100/165] ext4: make "offset" consistent in ext4_check_dir

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Date:	Fri, 30 Jul 2010 10:15:28 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Toshiyuki Okajima <toshi.okajima@...fujitsu.com>,
	"Theodore Tso" <tytso@....edu>
Subject: [100/165] ext4: make "offset" consistent in ext4_check_dir_entry()

2.6.32-stable review patch.  If anyone has any objections, please let us know.

------------------

commit b8b8afe236e97b6359d46d3a3f8c46455e192271 upstream (as of v2.6.33-git11)

The callers of ext4_check_dir_entry() usually pass in the "file
offset" (ext4_readdir, htree_dirblock_to_tree, search_dirblock,
ext4_dx_find_entry, empty_dir), but a few callers (add_dirent_to_buf,
ext4_delete_entry) only pass in the buffer offset.

To accomodate those last two (which would be hard to fix otherwise),
this patch changes ext4_check_dir_entry() to print the physical block
number and the relative offset as well as the passed-in offset.

Signed-off-by: Toshiyuki Okajima <toshi.okajima@...fujitsu.com>
Signed-off-by: "Theodore Ts'o" <tytso@....edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 fs/ext4/dir.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

--- a/fs/ext4/dir.c
+++ b/fs/ext4/dir.c
@@ -84,9 +84,11 @@ int ext4_check_dir_entry(const char *fun
 
 	if (error_msg != NULL)
 		ext4_error(dir->i_sb, function,
-			"bad entry in directory #%lu: %s - "
-			"offset=%u, inode=%u, rec_len=%d, name_len=%d",
-			dir->i_ino, error_msg, offset,
+			"bad entry in directory #%lu: %s - block=%llu"
+			"offset=%u(%u), inode=%u, rec_len=%d, name_len=%d",
+			dir->i_ino, error_msg,
+			(unsigned long long) bh->b_blocknr,
+			(unsigned) (offset%bh->b_size), offset,
 			le32_to_cpu(de->inode),
 			rlen, de->name_len);
 	return error_msg == NULL ? 1 : 0;


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