diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/md/raid10.c | 45 |
1 files changed, 29 insertions, 16 deletions
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c index 3c6b193cefd..5169ed2a915 100644 --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -97,7 +97,7 @@ static int max_queued_requests = 1024; static void allow_barrier(struct r10conf *conf); static void lower_barrier(struct r10conf *conf); -static int enough(struct r10conf *conf, int ignore); +static int _enough(struct r10conf *conf, int previous, int ignore); static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr, int *skipped); static void reshape_request_write(struct mddev *mddev, struct r10bio *r10_bio); @@ -392,11 +392,9 @@ static void raid10_end_read_request(struct bio *bio, int error) * than fail the last device. Here we redefine * "uptodate" to mean "Don't want to retry" */ - unsigned long flags; - spin_lock_irqsave(&conf->device_lock, flags); - if (!enough(conf, rdev->raid_disk)) + if (!_enough(conf, test_bit(R10BIO_Previous, &r10_bio->state), + rdev->raid_disk)) uptodate = 1; - spin_unlock_irqrestore(&conf->device_lock, flags); } if (uptodate) { raid_end_bio_io(r10_bio); @@ -1632,9 +1630,17 @@ static void status(struct seq_file *seq, struct mddev *mddev) * Don't consider the device numbered 'ignore' * as we might be about to remove it. */ -static int _enough(struct r10conf *conf, struct geom *geo, int ignore) +static int _enough(struct r10conf *conf, int previous, int ignore) { int first = 0; + int disks, ncopies; + if (previous) { + disks = conf->prev.raid_disks; + ncopies = conf->prev.near_copies; + } else { + disks = conf->geo.raid_disks; + ncopies = conf->geo.near_copies; + } do { int n = conf->copies; @@ -1644,25 +1650,31 @@ static int _enough(struct r10conf *conf, struct geom *geo, int ignore) if (conf->mirrors[this].rdev && this != ignore) cnt++; - this = (this+1) % geo->raid_disks; + this = (this+1) % disks; } if (cnt == 0) return 0; - first = (first + geo->near_copies) % geo->raid_disks; + first = (first + ncopies) % disks; } while (first != 0); return 1; } static int enough(struct r10conf *conf, int ignore) { - return _enough(conf, &conf->geo, ignore) && - _enough(conf, &conf->prev, ignore); + /* when calling 'enough', both 'prev' and 'geo' must + * be stable. + * This is ensured if ->reconfig_mutex or ->device_lock + * is held. + */ + return _enough(conf, 0, ignore) && + _enough(conf, 1, ignore); } static void error(struct mddev *mddev, struct md_rdev *rdev) { char b[BDEVNAME_SIZE]; struct r10conf *conf = mddev->private; + unsigned long flags; /* * If it is not operational, then we have already marked it as dead @@ -1670,18 +1682,18 @@ static void error(struct mddev *mddev, struct md_rdev *rdev) * next level up know. * else mark the drive as failed */ + spin_lock_irqsave(&conf->device_lock, flags); if (test_bit(In_sync, &rdev->flags) - && !enough(conf, rdev->raid_disk)) + && !enough(conf, rdev->raid_disk)) { /* * Don't fail the drive, just return an IO error. */ + spin_unlock_irqrestore(&conf->device_lock, flags); return; + } if (test_and_clear_bit(In_sync, &rdev->flags)) { - unsigned long flags; - spin_lock_irqsave(&conf->device_lock, flags); mddev->degraded++; - spin_unlock_irqrestore(&conf->device_lock, flags); - /* + /* * if recovery is running, make sure it aborts. */ set_bit(MD_RECOVERY_INTR, &mddev->recovery); @@ -1689,6 +1701,7 @@ static void error(struct mddev *mddev, struct md_rdev *rdev) set_bit(Blocked, &rdev->flags); set_bit(Faulty, &rdev->flags); set_bit(MD_CHANGE_DEVS, &mddev->flags); + spin_unlock_irqrestore(&conf->device_lock, flags); printk(KERN_ALERT "md/raid10:%s: Disk failure on %s, disabling device.\n" "md/raid10:%s: Operation continuing on %d devices.\n", @@ -1791,7 +1804,7 @@ static int raid10_add_disk(struct mddev *mddev, struct md_rdev *rdev) * very different from resync */ return -EBUSY; - if (rdev->saved_raid_disk < 0 && !_enough(conf, &conf->prev, -1)) + if (rdev->saved_raid_disk < 0 && !_enough(conf, 1, -1)) return -EINVAL; if (rdev->raid_disk >= 0) |