The patch titled
md: Improve detection of lack of barrier support in raid1
has been added to the -mm tree. Its filename is
md-improve-detection-of-lack-of-barrier-support-in-raid1.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
From: NeilBrown <neilb@xxxxxxx>
Move the test for 'do barrier work' down a bit so that if the first write to a
raid1 is a BIO_RW_BARRIER write, the checking done by superblock writes will
cause the right thing to happen.
Signed-off-by: Neil Brown <neilb@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
drivers/md/raid1.c | 16 +++++++++++-----
1 files changed, 11 insertions(+), 5 deletions(-)
diff -puN drivers/md/raid1.c~md-improve-detection-of-lack-of-barrier-support-in-raid1 drivers/md/raid1.c
--- 25/drivers/md/raid1.c~md-improve-detection-of-lack-of-barrier-support-in-raid1 Fri Apr 28 16:40:55 2006
+++ 25-akpm/drivers/md/raid1.c Fri Apr 28 16:40:55 2006
@@ -753,18 +753,24 @@ static int make_request(request_queue_t
const int rw = bio_data_dir(bio);
int do_barriers;
- if (unlikely(!mddev->barriers_work && bio_barrier(bio))) {
- bio_endio(bio, bio->bi_size, -EOPNOTSUPP);
- return 0;
- }
-
/*
* Register the new request and wait if the reconstruction
* thread has put up a bar for new requests.
* Continue immediately if no resync is active currently.
+ * We test barriers_work *after* md_write_start as md_write_start
+ * may cause the first superblock write, and that will check out
+ * if barriers work.
*/
+
md_write_start(mddev, bio); /* wait on superblock update early */
+ if (unlikely(!mddev->barriers_work && bio_barrier(bio))) {
+ if (rw == WRITE)
+ md_write_end(mddev);
+ bio_endio(bio, bio->bi_size, -EOPNOTSUPP);
+ return 0;
+ }
+
wait_barrier(conf);
disk_stat_inc(mddev->gendisk, ios[rw]);
_
Patches currently in -mm which might be from neilb@xxxxxxx are
md-avoid-oops-when-attempting-to-fix-read-errors-on-raid10.patch
md-fixed-refcounting-locking-when-attempting-read-error-correction-in-raid10.patch
md-change-enotsupp-to-eopnotsupp.patch
md-improve-detection-of-lack-of-barrier-support-in-raid1.patch
md-fix-rdev-nr_pending-count-when-retrying-barrier-requests.patch
fix-dcache-race-during-umount.patch
fix-dcache-race-during-umount-fix.patch
prune_one_dentry-tweaks.patch
remove-softlockup-from-invalidate_mapping_pages.patch
make-address_space_operations-invalidatepage-return-void-reiser4.patch
md-dm-reduce-stack-usage-with-stacked-block-devices.patch
-
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