Re: [PATCH 1/2] JBD2: Allow feature checks before journal recovery

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Wed, Jul 21, 2010 at 10:27 AM, Jan Kara <jack@xxxxxxx> wrote:
>> Signed-off-by: Patrick LoPresti <lopresti@xxxxxxxxx>
>>
>> diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
>> index bc2ff59..c5a864f 100644
>> --- a/fs/jbd2/journal.c
>> +++ b/fs/jbd2/journal.c
>> @@ -1365,6 +1365,8 @@ int jbd2_journal_check_used_features (journal_t *journal, unsigned long compat,
>>
>>       if (!compat && !ro && !incompat)
>>               return 1;
>> +     if (journal_get_superblock(journal))
>> +             return 0;
>>       if (journal->j_format_version == 1)
>>               return 0;
>
> This looks OK in principle. It would be even nicer to avoid all the checks
> journal_get_superblock() when the superblock is actually loaded so that we
> don't do them each time jbd2_journal_check_used_features is called...

How about this?

         if (!compat && !ro && !incompat)
                return 1;
+        if (journal->j_format_version == 0 &&
journal_get_superblock(journal) != 0)
+               return 0;
        if (journal->j_format_version == 1)
                return 0;

journal_init_common() uses kzalloc() to allocate the journal_t, and
journal_get_superblock() fills it in, so I believe this is a valid
test.

 - Pat
--
To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html


[Index of Archives]     [Linux Ext4 Filesystem]     [Union Filesystem]     [Filesystem Testing]     [Ceph Users]     [Ecryptfs]     [AutoFS]     [Kernel Newbies]     [Share Photos]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux Cachefs]     [Reiser Filesystem]     [Linux RAID]     [Samba]     [Device Mapper]     [CEPH Development]
  Powered by Linux