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authorNeilBrown <neilb@suse.de>2012-05-21 09:27:00 +1000
committerNeilBrown <neilb@suse.de>2012-05-21 09:27:00 +1000
commitc6563a8c38fde3c1c7fc925a10bde3ca20799301 (patch)
tree3916ae8247149a9dcf39ee1ca262f97be39071eb /drivers/md/md.h
parent2c810cddc44d6f95cef75df3f07fc0850ff92417 (diff)
downloadop-kernel-dev-c6563a8c38fde3c1c7fc925a10bde3ca20799301.zip
op-kernel-dev-c6563a8c38fde3c1c7fc925a10bde3ca20799301.tar.gz
md: add possibility to change data-offset for devices.
When reshaping we can avoid costly intermediate backup by changing the 'start' address of the array on the device (if there is enough room). So as a first step, allow such a change to be requested through sysfs, and recorded in v1.x metadata. (As we didn't previous check that all 'pad' fields were zero, we need a new FEATURE flag for this. A (belatedly) check that all remaining 'pad' fields are zero to avoid a repeat of this) The new data offset must be requested separately for each device. This allows each to have a different change in the data offset. This is not likely to be used often but as data_offset can be set per-device, new_data_offset should be too. This patch also removes the 'acknowledged' arg to rdev_set_badblocks as it is never used and never will be. At the same time we add a new arg ('in_new') which is currently always zero but will be used more soon. When a reshape finishes we will need to update the data_offset and rdev->sectors. So provide an exported function to do that. Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers/md/md.h')
-rw-r--r--drivers/md/md.h7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/md/md.h b/drivers/md/md.h
index d51c0ca..98913e8 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -55,6 +55,7 @@ struct md_rdev {
int sb_loaded;
__u64 sb_events;
sector_t data_offset; /* start of data in array */
+ sector_t new_data_offset;/* only relevant while reshaping */
sector_t sb_start; /* offset of the super block (in 512byte sectors) */
int sb_size; /* bytes in the superblock */
int preferred_minor; /* autorun support */
@@ -193,8 +194,9 @@ static inline int is_badblock(struct md_rdev *rdev, sector_t s, int sectors,
return 0;
}
extern int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
- int acknowledged);
-extern int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors);
+ int is_new);
+extern int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
+ int is_new);
extern void md_ack_all_badblocks(struct badblocks *bb);
struct mddev {
@@ -592,6 +594,7 @@ extern void md_write_start(struct mddev *mddev, struct bio *bi);
extern void md_write_end(struct mddev *mddev);
extern void md_done_sync(struct mddev *mddev, int blocks, int ok);
extern void md_error(struct mddev *mddev, struct md_rdev *rdev);
+extern void md_finish_reshape(struct mddev *mddev);
extern int mddev_congested(struct mddev *mddev, int bits);
extern void md_flush_request(struct mddev *mddev, struct bio *bio);
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