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authorNeilBrown <neilb@suse.de>2009-12-14 12:49:54 +1100
committerNeilBrown <neilb@suse.de>2009-12-14 12:51:41 +1100
commitf6af949c5672115313cc3c976d85b0533f607d7e (patch)
tree6d00471bd4ee7c3aee67f9ad4c0a3023109b88e0 /drivers/md/md.h
parent9cd30fdc33cde9ae4ac55a1ccbbb89f3f7b9b2f2 (diff)
md: support bitmap offset appropriate for external-metadata arrays.
For md arrays were metadata is managed externally, the kernel does not know about a superblock so the superblock offset is 0. If we want to have a write-intent-bitmap near the end of the devices of such an array, we should support sector_t sized offset. We need offset be possibly negative for when the bitmap is before the metadata, so use loff_t instead. Also add sanity check that bitmap does not overlap with data. Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers/md/md.h')
-rw-r--r--drivers/md/md.h6
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/md/md.h b/drivers/md/md.h
index 4b07e0ab3841..df692953a12f 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -282,11 +282,13 @@ struct mddev_s
struct bitmap *bitmap; /* the bitmap for the device */
struct {
struct file *file; /* the bitmap file */
- long offset; /* offset from superblock of
+ loff_t offset; /* offset from superblock of
* start of bitmap. May be
* negative, but not '0'
+ * For external metadata, offset
+ * from start of device.
*/
- long default_offset; /* this is the offset to use when
+ loff_t default_offset; /* this is the offset to use when
* hot-adding a bitmap. It should
* eventually be settable by sysfs.
*/