On Sat, Jun 28, 2014 at 06:29:46PM +0400, Azat Khuzhin wrote:
>
> Here is the RFC patch for this, I'm not sure about the check for *is this
> journal device or not*, so I will glad to see some comments. Thanks.
The way you tell whether or not you've opened the journal device is as
follows:
if (fs->super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) {
...
That is to say, the journal device has a ext2/3/4 superblock, but with
a special incompat flag which indicates that it is an external journal
--- and which also prevents the kernel from trying to mount the
external journal device as a normal ext4 file system.
Regards,
- Ted
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