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md: override md superblock recovery_offset for journal device

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Journal device stores data in a log structure. We need record the log
start. Here we override md superblock recovery_offset for this purpose.
This field of a journal device is meaningless otherwise.

Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: NeilBrown <neilb@suse.com>
This commit is contained in:
Shaohua Li
2015-08-13 14:31:56 -07:00
committed by NeilBrown
parent bac624f3f8
commit 3069aa8def
3 changed files with 17 additions and 2 deletions
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8
drivers/md/md.h
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@@ -87,10 +87,16 @@ struct md_rdev {
* array and could again if we did a partial
* resync from the bitmap
*/
sector_t recovery_offset;/* If this device has been partially
union {
sector_t recovery_offset;/* If this device has been partially
* recovered, this is where we were
* up to.
*/
sector_t journal_tail; /* If this device is a journal device,
* this is the journal tail (journal
* recovery start point)
*/
};
atomic_t nr_pending; /* number of pending requests.
* only maintained for arrays that