From e384e58549a2e9a83071ad80280c1a9053cfd84c Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Tue, 1 Jun 2010 19:37:34 +1000 Subject: 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 --- drivers/md/bitmap.h | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'drivers/md/bitmap.h') 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 */ -- cgit v1.2.3