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authorLinus Torvalds <torvalds@linux-foundation.org>2012-07-19 08:27:13 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-07-19 08:27:13 -0700
commit3e4b9459fb0e149c6b74c9e89399a8fc39a92b44 (patch)
tree1fb7c9bee029c0349f4e2071fcdfc10fbbcd0d00 /drivers
parent309d4b000b0c427dafece9111682dd15fbaae6a6 (diff)
parent58e94ae18478c08229626daece2fc108a4a23261 (diff)
Merge tag 'md-3.5-fixes' of git://neil.brown.name/md
Pull three md bugfixes from NeilBrown: "One of the bugs was introduced in 3.5-rc1. Others have been there for longer." * tag 'md-3.5-fixes' of git://neil.brown.name/md: md/raid1: close some possible races on write errors during resync md: avoid crash when stopping md array races with closing other open fds. md: fix bug in handling of new_data_offset
Diffstat (limited to 'drivers')
-rw-r--r--drivers/md/md.c37
-rw-r--r--drivers/md/raid1.c10
2 files changed, 32 insertions, 15 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c
index a4c219e3c859..d5ab4493c8be 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -2931,6 +2931,7 @@ offset_store(struct md_rdev *rdev, const char *buf, size_t len)
* can be sane */
return -EBUSY;
rdev->data_offset = offset;
+ rdev->new_data_offset = offset;
return len;
}
@@ -3926,8 +3927,8 @@ array_state_show(struct mddev *mddev, char *page)
return sprintf(page, "%s\n", array_states[st]);
}
-static int do_md_stop(struct mddev * mddev, int ro, int is_open);
-static int md_set_readonly(struct mddev * mddev, int is_open);
+static int do_md_stop(struct mddev * mddev, int ro, struct block_device *bdev);
+static int md_set_readonly(struct mddev * mddev, struct block_device *bdev);
static int do_md_run(struct mddev * mddev);
static int restart_array(struct mddev *mddev);
@@ -3943,14 +3944,14 @@ array_state_store(struct mddev *mddev, const char *buf, size_t len)
/* stopping an active array */
if (atomic_read(&mddev->openers) > 0)
return -EBUSY;
- err = do_md_stop(mddev, 0, 0);
+ err = do_md_stop(mddev, 0, NULL);
break;
case inactive:
/* stopping an active array */
if (mddev->pers) {
if (atomic_read(&mddev->openers) > 0)
return -EBUSY;
- err = do_md_stop(mddev, 2, 0);
+ err = do_md_stop(mddev, 2, NULL);
} else
err = 0; /* already inactive */
break;
@@ -3958,7 +3959,7 @@ array_state_store(struct mddev *mddev, const char *buf, size_t len)
break; /* not supported yet */
case readonly:
if (mddev->pers)
- err = md_set_readonly(mddev, 0);
+ err = md_set_readonly(mddev, NULL);
else {
mddev->ro = 1;
set_disk_ro(mddev->gendisk, 1);
@@ -3968,7 +3969,7 @@ array_state_store(struct mddev *mddev, const char *buf, size_t len)
case read_auto:
if (mddev->pers) {
if (mddev->ro == 0)
- err = md_set_readonly(mddev, 0);
+ err = md_set_readonly(mddev, NULL);
else if (mddev->ro == 1)
err = restart_array(mddev);
if (err == 0) {
@@ -5351,15 +5352,17 @@ void md_stop(struct mddev *mddev)
}
EXPORT_SYMBOL_GPL(md_stop);
-static int md_set_readonly(struct mddev *mddev, int is_open)
+static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
{
int err = 0;
mutex_lock(&mddev->open_mutex);
- if (atomic_read(&mddev->openers) > is_open) {
+ if (atomic_read(&mddev->openers) > !!bdev) {
printk("md: %s still in use.\n",mdname(mddev));
err = -EBUSY;
goto out;
}
+ if (bdev)
+ sync_blockdev(bdev);
if (mddev->pers) {
__md_stop_writes(mddev);
@@ -5381,18 +5384,26 @@ out:
* 0 - completely stop and dis-assemble array
* 2 - stop but do not disassemble array
*/
-static int do_md_stop(struct mddev * mddev, int mode, int is_open)
+static int do_md_stop(struct mddev * mddev, int mode,
+ struct block_device *bdev)
{
struct gendisk *disk = mddev->gendisk;
struct md_rdev *rdev;
mutex_lock(&mddev->open_mutex);
- if (atomic_read(&mddev->openers) > is_open ||
+ if (atomic_read(&mddev->openers) > !!bdev ||
mddev->sysfs_active) {
printk("md: %s still in use.\n",mdname(mddev));
mutex_unlock(&mddev->open_mutex);
return -EBUSY;
}
+ if (bdev)
+ /* It is possible IO was issued on some other
+ * open file which was closed before we took ->open_mutex.
+ * As that was not the last close __blkdev_put will not
+ * have called sync_blockdev, so we must.
+ */
+ sync_blockdev(bdev);
if (mddev->pers) {
if (mddev->ro)
@@ -5466,7 +5477,7 @@ static void autorun_array(struct mddev *mddev)
err = do_md_run(mddev);
if (err) {
printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
- do_md_stop(mddev, 0, 0);
+ do_md_stop(mddev, 0, NULL);
}
}
@@ -6481,11 +6492,11 @@ static int md_ioctl(struct block_device *bdev, fmode_t mode,
goto done_unlock;
case STOP_ARRAY:
- err = do_md_stop(mddev, 0, 1);
+ err = do_md_stop(mddev, 0, bdev);
goto done_unlock;
case STOP_ARRAY_RO:
- err = md_set_readonly(mddev, 1);
+ err = md_set_readonly(mddev, bdev);
goto done_unlock;
case BLKROSET:
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 240ff3125040..cacd008d6864 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1818,8 +1818,14 @@ static void sync_request_write(struct mddev *mddev, struct r1bio *r1_bio)
if (atomic_dec_and_test(&r1_bio->remaining)) {
/* if we're here, all write(s) have completed, so clean up */
- md_done_sync(mddev, r1_bio->sectors, 1);
- put_buf(r1_bio);
+ int s = r1_bio->sectors;
+ if (test_bit(R1BIO_MadeGood, &r1_bio->state) ||
+ test_bit(R1BIO_WriteError, &r1_bio->state))
+ reschedule_retry(r1_bio);
+ else {
+ put_buf(r1_bio);
+ md_done_sync(mddev, s, 1);
+ }
}
}