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-rw-r--r--drivers/md/raid1.c89
1 files changed, 51 insertions, 38 deletions
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 34e26834ad28..0466ee2453b4 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -447,19 +447,21 @@ static void raid1_end_write_request(struct bio *bio)
/* We never try FailFast to WriteMostly devices */
!test_bit(WriteMostly, &rdev->flags)) {
md_error(r1_bio->mddev, rdev);
- if (!test_bit(Faulty, &rdev->flags))
- /* This is the only remaining device,
- * We need to retry the write without
- * FailFast
- */
- set_bit(R1BIO_WriteError, &r1_bio->state);
- else {
- /* Finished with this branch */
- r1_bio->bios[mirror] = NULL;
- to_put = bio;
- }
- } else
+ }
+
+ /*
+ * When the device is faulty, it is not necessary to
+ * handle write error.
+ * For failfast, this is the only remaining device,
+ * We need to retry the write without FailFast.
+ */
+ if (!test_bit(Faulty, &rdev->flags))
set_bit(R1BIO_WriteError, &r1_bio->state);
+ else {
+ /* Finished with this branch */
+ r1_bio->bios[mirror] = NULL;
+ to_put = bio;
+ }
} else {
/*
* Set R1BIO_Uptodate in our master bio, so that we
@@ -872,8 +874,11 @@ static void flush_pending_writes(struct r1conf *conf)
* backgroup IO calls must call raise_barrier. Once that returns
* there is no normal IO happeing. It must arrange to call
* lower_barrier when the particular background IO completes.
+ *
+ * If resync/recovery is interrupted, returns -EINTR;
+ * Otherwise, returns 0.
*/
-static sector_t raise_barrier(struct r1conf *conf, sector_t sector_nr)
+static int raise_barrier(struct r1conf *conf, sector_t sector_nr)
{
int idx = sector_to_idx(sector_nr);
@@ -1612,12 +1617,12 @@ static void raid1_error(struct mddev *mddev, struct md_rdev *rdev)
/*
* If it is not operational, then we have already marked it as dead
- * else if it is the last working disks, ignore the error, let the
- * next level up know.
+ * else if it is the last working disks with "fail_last_dev == false",
+ * ignore the error, let the next level up know.
* else mark the drive as failed
*/
spin_lock_irqsave(&conf->device_lock, flags);
- if (test_bit(In_sync, &rdev->flags)
+ if (test_bit(In_sync, &rdev->flags) && !mddev->fail_last_dev
&& (conf->raid_disks - mddev->degraded) == 1) {
/*
* Don't fail the drive, act as though we were just a
@@ -1901,6 +1906,22 @@ static void abort_sync_write(struct mddev *mddev, struct r1bio *r1_bio)
} while (sectors_to_go > 0);
}
+static void put_sync_write_buf(struct r1bio *r1_bio, int uptodate)
+{
+ if (atomic_dec_and_test(&r1_bio->remaining)) {
+ struct mddev *mddev = r1_bio->mddev;
+ 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, uptodate);
+ }
+ }
+}
+
static void end_sync_write(struct bio *bio)
{
int uptodate = !bio->bi_status;
@@ -1927,16 +1948,7 @@ static void end_sync_write(struct bio *bio)
)
set_bit(R1BIO_MadeGood, &r1_bio->state);
- if (atomic_dec_and_test(&r1_bio->remaining)) {
- 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, uptodate);
- }
- }
+ put_sync_write_buf(r1_bio, uptodate);
}
static int r1_sync_page_io(struct md_rdev *rdev, sector_t sector,
@@ -2219,17 +2231,7 @@ static void sync_request_write(struct mddev *mddev, struct r1bio *r1_bio)
generic_make_request(wbio);
}
- if (atomic_dec_and_test(&r1_bio->remaining)) {
- /* if we're here, all write(s) have completed, so clean up */
- 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);
- }
- }
+ put_sync_write_buf(r1_bio, 1);
}
/*
@@ -3127,6 +3129,13 @@ static int raid1_run(struct mddev *mddev)
!test_bit(In_sync, &conf->mirrors[i].rdev->flags) ||
test_bit(Faulty, &conf->mirrors[i].rdev->flags))
mddev->degraded++;
+ /*
+ * RAID1 needs at least one disk in active
+ */
+ if (conf->raid_disks - mddev->degraded < 1) {
+ ret = -EINVAL;
+ goto abort;
+ }
if (conf->raid_disks - mddev->degraded == 1)
mddev->recovery_cp = MaxSector;
@@ -3160,8 +3169,12 @@ static int raid1_run(struct mddev *mddev)
ret = md_integrity_register(mddev);
if (ret) {
md_unregister_thread(&mddev->thread);
- raid1_free(mddev, conf);
+ goto abort;
}
+ return 0;
+
+abort:
+ raid1_free(mddev, conf);
return ret;
}