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| author | NeilBrown <neilb@suse.de> | 2010-06-01 19:37:34 +1000 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2010-07-26 13:21:34 +1000 |
| commit | e384e58549a2e9a83071ad80280c1a9053cfd84c (patch) | |
| tree | 805619143612ddc8cc71a45dd4522393c23a576f /drivers/md/md.h | |
| parent | ef4256733506f2459a0c436b62267d22a3f0cec6 (diff) | |
| download | lwn-e384e58549a2e9a83071ad80280c1a9053cfd84c.tar.gz lwn-e384e58549a2e9a83071ad80280c1a9053cfd84c.zip | |
md/bitmap: prepare for storing write-intent-bitmap via dm-dirty-log.
This allows md/raid5 to fully work as a dm target.
Normally md uses a 'filemap' which contains a list of pages of bits
each of which may be written separately.
dm-log uses and all-or-nothing approach to writing the log, so
when using a dm-log, ->filemap is NULL and the flags normally stored
in filemap_attr are stored in ->logattrs instead.
Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers/md/md.h')
| -rw-r--r-- | drivers/md/md.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/md/md.h b/drivers/md/md.h index 0a850780b5d1..cccbadb31bae 100644 --- a/drivers/md/md.h +++ b/drivers/md/md.h @@ -317,6 +317,11 @@ struct mddev_s * hot-adding a bitmap. It should * eventually be settable by sysfs. */ + /* When md is serving under dm, it might use a + * dirty_log to store the bits. + */ + struct dm_dirty_log *log; + struct mutex mutex; unsigned long chunksize; unsigned long daemon_sleep; /* how many jiffies between updates? */ |