linux-ext4 - Re: [PATCH 2/2] jbd2: fix descriptor block size handling errors with journal

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:	Fri, 5 Sep 2014 21:27:34 -0700
From:	"Darrick J. Wong" <darrick.wong@...cle.com>
To:	TR Reardon <thomas_reardon@...mail.com>
Cc:	"Theodore Ts'o" <tytso@....edu>, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 2/2] jbd2: fix descriptor block size handling errors with
 journal_csum

On Fri, Sep 05, 2014 at 09:01:54PM -0700, Darrick J. Wong wrote:
> On Tue, Sep 02, 2014 at 03:28:33PM -0400, TR Reardon wrote:
> > There may still be problems with this patch.  After applying to 3.16.1, I am now getting "can't enable checksumming v2 and v3 at the same time" errors on mount.  Initial mount/dismount work fine, but once fs is touched--forcing superblock update--it cannot be mounted anew.
> > 
> > Note results from dumpe2fs  (without recent patches)
> > 
> > Journal backup:           inode blocks
> > Checksum type:            crc32c
> > Checksum:                 0x39141b69
> > Journal features:         journal_incompat_revoke journal_64bit journal_async_commit journal_checksum_v2 FEATURE_I4
> > Journal size:             128M
> > Journal length:           32768
> > Journal sequence:         0x00012aa4
> > Journal start:            0
> > Journal checksum type:    crc32c
> > Journal checksum:         0x3952b695
> > 
> > Seems that the old v2 flag is not cleared on dismount?
> 
> Yep.  Thanks for catching this.

Also, would you mind testing this patch?  I think it'll suffice to clear all
the journal flags before enabling whichever one we want.

--D

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 0b28b36..aff945d 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3190,6 +3190,10 @@ static int set_journal_csum_feature_set(struct super_block *sb)
 		incompat = 0;
 	}
 
+	jbd2_journal_clear_features(sbi->s_journal,
+			JBD2_FEATURE_COMPAT_CHECKSUM, 0,
+			JBD2_FEATURE_INCOMPAT_CSUM_V3 |
+			JBD2_FEATURE_INCOMPAT_CSUM_V2);
 	if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
 		ret = jbd2_journal_set_features(sbi->s_journal,
 				compat, 0,
@@ -3202,11 +3206,8 @@ static int set_journal_csum_feature_set(struct super_block *sb)
 		jbd2_journal_clear_features(sbi->s_journal, 0, 0,
 				JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
 	} else {
-		jbd2_journal_clear_features(sbi->s_journal,
-				JBD2_FEATURE_COMPAT_CHECKSUM, 0,
-				JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
-				JBD2_FEATURE_INCOMPAT_CSUM_V3 |
-				JBD2_FEATURE_INCOMPAT_CSUM_V2);
+		jbd2_journal_clear_features(sbi->s_journal, 0, 0,
+				JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
 	}
 
 	return ret;
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html