[PULL REQUEST] md fixes for 3.1

Hi Linus,
please pull assorted small md fixes as follows.

Thanks,
NeilBrown


The following changes since commit 14c62e78dc1379185515be41903c4a667efc6d54:

Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6- tip (2011-08-23 18:09:08 -0700)

are available in the git repository at:

git://neil.brown.name/md for-linus

Namhyung Kim (1):
md: use REQ_NOIDLE flag in md_super_write()

NeilBrown (5):
md: report failure if a 'set faulty' request doesn't.
md: ensure changes to 'write-mostly' are reflected in metadata.
md/linear: avoid corrupting structure while waiting for rcu_free to complete.
md: fix clearing of 'blocked' flag in the presence of bad blocks.
md/raid5: fix a hang on device failure.

drivers/md/linear.h | 2 +-
drivers/md/md.c | 16 +++++++++++++---
drivers/md/raid5.c | 2 +-
3 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/drivers/md/linear.h b/drivers/md/linear.h
index 0ce29b6..2f2da05 100644
--- a/drivers/md/linear.h
+++ b/drivers/md/linear.h
@@ -10,9 +10,9 @@ typedef struct dev_info dev_info_t;

struct linear_private_data
{
+ struct rcu_head rcu;
sector_t array_sectors;
dev_info_t disks[0];
- struct rcu_head rcu;
};


diff --git a/drivers/md/md.c b/drivers/md/md.c
index 8e221a2..3742ce8 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -848,7 +848,7 @@ void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
bio->bi_end_io = super_written;

atomic_inc(&mddev->pending_writes);
- submit_bio(REQ_WRITE | REQ_SYNC | REQ_FLUSH | REQ_FUA, bio);
+ submit_bio(WRITE_FLUSH_FUA, bio);
}

void md_super_wait(mddev_t *mddev)
@@ -1738,6 +1738,11 @@ static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
sb->level = cpu_to_le32(mddev->level);
sb->layout = cpu_to_le32(mddev->layout);

+ if (test_bit(WriteMostly, &rdev->flags))
+ sb->devflags |= WriteMostly1;
+ else
+ sb->devflags &= ~WriteMostly1;
+
if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
@@ -2561,7 +2566,10 @@ state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
int err = -EINVAL;
if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
md_error(rdev->mddev, rdev);
- err = 0;
+ if (test_bit(Faulty, &rdev->flags))
+ err = 0;
+ else
+ err = -EBUSY;
} else if (cmd_match(buf, "remove")) {
if (rdev->raid_disk >= 0)
err = -EBUSY;
@@ -2584,7 +2592,7 @@ state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
err = 0;
} else if (cmd_match(buf, "-blocked")) {
if (!test_bit(Faulty, &rdev->flags) &&
- test_bit(BlockedBadBlocks, &rdev->flags)) {
+ rdev->badblocks.unacked_exist) {
/* metadata handler doesn't understand badblocks,
* so we need to fail the device
*/
@@ -5983,6 +5991,8 @@ static int set_disk_faulty(mddev_t *mddev, dev_t dev)
return -ENODEV;

md_error(mddev, rdev);
+ if (!test_bit(Faulty, &rdev->flags))
+ return -EBUSY;
return 0;
}

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index dbae459..43709fa 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -3336,7 +3336,7 @@ static void handle_stripe(struct stripe_head *sh)

finish:
/* wait for this device to become unblocked */
- if (unlikely(s.blocked_rdev))
+ if (conf->mddev->external && unlikely(s.blocked_rdev))
md_wait_for_blocked_rdev(s.blocked_rdev, conf->mddev);

if (s.handle_bad_blocks)
--
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