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| author | NeilBrown <neilb@suse.de> | 2010-06-01 11:37:34 +0200 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2010-07-26 05:21:34 +0200 |
| commit | e384e58549a2e9a83071ad80280c1a9053cfd84c (patch) | |
| tree | 805619143612ddc8cc71a45dd4522393c23a576f /drivers/md/bitmap.h | |
| parent | md/bitmap: optimise scanning of empty bitmaps. (diff) | |
| download | linux-e384e58549a2e9a83071ad80280c1a9053cfd84c.tar.xz linux-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/bitmap.h')
| -rw-r--r-- | drivers/md/bitmap.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/md/bitmap.h b/drivers/md/bitmap.h index 3797dea4723a..a7a11134268d 100644 --- a/drivers/md/bitmap.h +++ b/drivers/md/bitmap.h @@ -222,6 +222,10 @@ struct bitmap { unsigned long file_pages; /* number of pages in the file */ int last_page_size; /* bytes in the last page */ + unsigned long logattrs; /* used when filemap_attr doesn't exist + * because we are working with a dirty_log + */ + unsigned long flags; int allclean; @@ -243,6 +247,7 @@ struct bitmap { wait_queue_head_t behind_wait; struct sysfs_dirent *sysfs_can_clear; + }; /* the bitmap API */ |