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Date: Thu, 9 Nov 2006 14:21:21 -0700
From: Andreas Dilger <adilger@...sterfs.com>
To: Andrew Morton <akpm@...l.org>
Cc: "linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: Fw: Errors reported by Coverity in ext3.
On Nov 09, 2006 11:14 -0800, Andrew Morton wrote:
> 2. Error reported in ext3/inode.c
> ---
> CID: 3548
> Checker: CHECKED_RETURN
> File: fs/ext3/inode.c
> Function: ext3_clear_blocks
> Description: Return value of "__ext3_journal_get_write_access" is not checked
>
> 1816 if (bh) {
> 1817 BUFFER_TRACE(bh, "retaking write access");
>
> Event check_return: Called function "__ext3_journal_get_write_access"
> whose return value should be checked (checked 32 out of 39 times)
> Event unchecked_value: Return value of
> "__ext3_journal_get_write_access" is not checked Also see events:
>
> 1818 ext3_journal_get_write_access(handle, bh);
> 1819 }
> ---
Here is a patch we have locally for this one (though against a 2.6.9-RHEL4
kernel, likely usable in mainline with minor tweaks).
Signed-off-by: Andreas Dilger <adilger@...sterfs.com>
- ext3-check-jbd-errors-2.6.9.patch ---------------------------------------
Index: linux-2.6.9-full/include/linux/ext3_fs.h
===================================================================
--- linux-2.6.9-full.orig/include/linux/ext3_fs.h 2006-08-09 17:56:39.000000000 +0400
+++ linux-2.6.9-full/include/linux/ext3_fs.h 2006-08-22 12:36:22.000000000 +0400
@@ -826,6 +826,7 @@ extern void ext3_put_super (struct super
extern void ext3_write_super (struct super_block *);
extern void ext3_write_super_lockfs (struct super_block *);
extern void ext3_unlockfs (struct super_block *);
+extern void ext3_commit_super (struct super_block *, struct ext3_super_block *, int);
extern int ext3_remount (struct super_block *, int *, char *);
extern int ext3_statfs (struct super_block *, struct kstatfs *);
Index: linux-2.6.9-full/fs/ext3/super.c
===================================================================
--- linux-2.6.9-full.orig/fs/ext3/super.c 2006-08-09 17:56:40.000000000 +0400
+++ linux-2.6.9-full/fs/ext3/super.c 2006-08-09 17:56:40.000000000 +0400
@@ -43,7 +43,7 @@ static int ext3_load_journal(struct supe
unsigned long journal_devnum);
static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
int);
-static void ext3_commit_super (struct super_block * sb,
+void ext3_commit_super (struct super_block * sb,
struct ext3_super_block * es,
int sync);
static void ext3_mark_recovery_complete(struct super_block * sb,
@@ -1991,7 +1991,7 @@ static int ext3_create_journal(struct su
return 0;
}
-static void ext3_commit_super (struct super_block * sb,
+void ext3_commit_super (struct super_block * sb,
struct ext3_super_block * es,
int sync)
{
Index: linux-2.6.9-full/fs/ext3/namei.c
===================================================================
--- linux-2.6.9-full.orig/fs/ext3/namei.c 2006-08-09 17:56:40.000000000 +0400
+++ linux-2.6.9-full/fs/ext3/namei.c 2006-08-09 17:56:40.000000000 +0400
@@ -1599,7 +1599,7 @@ static int ext3_delete_entry (handle_t *
struct buffer_head * bh)
{
struct ext3_dir_entry_2 * de, * pde;
- int i;
+ int i, err;
i = 0;
pde = NULL;
@@ -1609,7 +1609,9 @@ static int ext3_delete_entry (handle_t *
return -EIO;
if (de == de_del) {
BUFFER_TRACE(bh, "get_write_access");
- ext3_journal_get_write_access(handle, bh);
+ err = ext3_journal_get_write_access(handle, bh);
+ if (err)
+ return err;
if (pde)
pde->rec_len =
cpu_to_le16(le16_to_cpu(pde->rec_len) +
Index: linux-2.6.9-full/fs/ext3/inode.c
===================================================================
--- linux-2.6.9-full.orig/fs/ext3/inode.c 2006-06-02 23:37:38.000000000 +0400
+++ linux-2.6.9-full/fs/ext3/inode.c 2006-08-22 12:34:28.000000000 +0400
@@ -1807,8 +1812,18 @@ ext3_clear_blocks(handle_t *handle, stru
ext3_mark_inode_dirty(handle, inode);
ext3_journal_test_restart(handle, inode);
if (bh) {
+ int err;
BUFFER_TRACE(bh, "retaking write access");
- ext3_journal_get_write_access(handle, bh);
+ err = ext3_journal_get_write_access(handle, bh);
+ if (err) {
+ struct super_block *sb = inode->i_sb;
+ struct ext3_super_block *es = EXT3_SB(sb)->s_es;
+ printk(KERN_CRIT "EXT3-fs: can't continue truncate\n");
+ EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
+ es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
+ ext3_commit_super(sb, es, 1);
+ return;
+ }
}
}
Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.
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