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md: 3 bugfixes for 3.5-rc

Browse Source 
One of the bugs was introduced in 3.5-rc1.  Others have
 been there for longer.
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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
This commit is contained in:
Linus Torvalds 2012-07-19 08:27:13 -07:00
commit 3e4b9459fb
2 changed files with 32 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
drivers/md/md.c
View File

@ -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:

10
drivers/md/raid1.c
View File

@ -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);
}
}
}