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Merge branch 'for-linus' of git://neil.brown.name/md 

* 'for-linus' of git://neil.brown.name/md:
  md: use interruptible wait when duration is controlled by userspace.
  md/raid5: suspend shouldn't affect read requests.
  md: tidy up error paths in md_alloc
  md: fix error path when duplicate name is found on md device creation.
  md: avoid dereferencing NULL pointer when accessing suspend_* sysfs attributes.
  md: Use new topology calls to indicate alignment and I/O sizes
This commit is contained in:
Linus Torvalds 2009-07-01 10:31:26 -07:00
parent 7b85425fac e62e58a5ff
commit 544ae5f96e
7 changed files with 84 additions and 48 deletions
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4
drivers/md/linear.c
View File

@ -166,8 +166,8 @@ static linear_conf_t *linear_conf(mddev_t *mddev, int raid_disks)
rdev->sectors = sectors * mddev->chunk_sectors;
}
blk_queue_stack_limits(mddev->queue,
rdev->bdev->bd_disk->queue);
disk_stack_limits(mddev->gendisk, rdev->bdev,
rdev->data_offset << 9);
/* as we don't honour merge_bvec_fn, we must never risk
* violating it, so limit ->max_sector to one PAGE, as
* a one page request is never in violation.

56
drivers/md/md.c
View File

@ -3573,7 +3573,8 @@ suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
char *e;
unsigned long long new = simple_strtoull(buf, &e, 10);
if (mddev->pers->quiesce == NULL)
if (mddev->pers == NULL ||
mddev->pers->quiesce == NULL)
return -EINVAL;
if (buf == e || (*e && *e != '\n'))
return -EINVAL;
@ -3601,7 +3602,8 @@ suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
char *e;
unsigned long long new = simple_strtoull(buf, &e, 10);
if (mddev->pers->quiesce == NULL)
if (mddev->pers == NULL ||
mddev->pers->quiesce == NULL)
return -EINVAL;
if (buf == e || (*e && *e != '\n'))
return -EINVAL;
@ -3844,11 +3846,9 @@ static int md_alloc(dev_t dev, char *name)
flush_scheduled_work();
mutex_lock(&disks_mutex);
if (mddev->gendisk) {
mutex_unlock(&disks_mutex);
mddev_put(mddev);
return -EEXIST;
}
error = -EEXIST;
if (mddev->gendisk)
goto abort;
if (name) {
/* Need to ensure that 'name' is not a duplicate.
@ -3860,17 +3860,15 @@ static int md_alloc(dev_t dev, char *name)
if (mddev2->gendisk &&
strcmp(mddev2->gendisk->disk_name, name) == 0) {
spin_unlock(&all_mddevs_lock);
return -EEXIST;
goto abort;
}
spin_unlock(&all_mddevs_lock);
}
error = -ENOMEM;
mddev->queue = blk_alloc_queue(GFP_KERNEL);
if (!mddev->queue) {
mutex_unlock(&disks_mutex);
mddev_put(mddev);
return -ENOMEM;
}
if (!mddev->queue)
goto abort;
mddev->queue->queuedata = mddev;
/* Can be unlocked because the queue is new: no concurrency */
@ -3880,11 +3878,9 @@ static int md_alloc(dev_t dev, char *name)
disk = alloc_disk(1 << shift);
if (!disk) {
mutex_unlock(&disks_mutex);
blk_cleanup_queue(mddev->queue);
mddev->queue = NULL;
mddev_put(mddev);
return -ENOMEM;
goto abort;
}
disk->major = MAJOR(mddev->unit);
disk->first_minor = unit << shift;
@ -3906,16 +3902,22 @@ static int md_alloc(dev_t dev, char *name)
mddev->gendisk = disk;
error = kobject_init_and_add(&mddev->kobj, &md_ktype,
&disk_to_dev(disk)->kobj, "%s", "md");
mutex_unlock(&disks_mutex);
if (error)
if (error) {
/* This isn't possible, but as kobject_init_and_add is marked
* __must_check, we must do something with the result
*/
printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
disk->disk_name);
else {
error = 0;
}
abort:
mutex_unlock(&disks_mutex);
if (!error) {
kobject_uevent(&mddev->kobj, KOBJ_ADD);
mddev->sysfs_state = sysfs_get_dirent(mddev->kobj.sd, "array_state");
}
mddev_put(mddev);
return 0;
return error;
}
static struct kobject *md_probe(dev_t dev, int *part, void *data)
@ -6334,10 +6336,16 @@ void md_do_sync(mddev_t *mddev)
sysfs_notify(&mddev->kobj, NULL, "sync_completed");
}
if (j >= mddev->resync_max)
wait_event(mddev->recovery_wait,
mddev->resync_max > j
|| kthread_should_stop());
while (j >= mddev->resync_max && !kthread_should_stop()) {
/* As this condition is controlled by user-space,
* we can block indefinitely, so use '_interruptible'
* to avoid triggering warnings.
*/
flush_signals(current); /* just in case */
wait_event_interruptible(mddev->recovery_wait,
mddev->resync_max > j
|| kthread_should_stop());
}
if (kthread_should_stop())
goto interrupted;

7
drivers/md/multipath.c
View File

@ -294,7 +294,8 @@ static int multipath_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
for (path = first; path <= last; path++)
if ((p=conf->multipaths+path)->rdev == NULL) {
q = rdev->bdev->bd_disk->queue;
blk_queue_stack_limits(mddev->queue, q);
disk_stack_limits(mddev->gendisk, rdev->bdev,
rdev->data_offset << 9);
/* as we don't honour merge_bvec_fn, we must never risk
* violating it, so limit ->max_sector to one PAGE, as
@ -463,9 +464,9 @@ static int multipath_run (mddev_t *mddev)
disk = conf->multipaths + disk_idx;
disk->rdev = rdev;
disk_stack_limits(mddev->gendisk, rdev->bdev,
rdev->data_offset << 9);
blk_queue_stack_limits(mddev->queue,
rdev->bdev->bd_disk->queue);
/* as we don't honour merge_bvec_fn, we must never risk
* violating it, not that we ever expect a device with
* a merge_bvec_fn to be involved in multipath */

9
drivers/md/raid0.c
View File

@ -170,8 +170,8 @@ static int create_strip_zones(mddev_t *mddev)
}
dev[j] = rdev1;
blk_queue_stack_limits(mddev->queue,
rdev1->bdev->bd_disk->queue);
disk_stack_limits(mddev->gendisk, rdev1->bdev,
rdev1->data_offset << 9);
/* as we don't honour merge_bvec_fn, we must never risk
* violating it, so limit ->max_sector to one PAGE, as
* a one page request is never in violation.
@ -250,6 +250,11 @@ static int create_strip_zones(mddev_t *mddev)
mddev->chunk_sectors << 9);
goto abort;
}
blk_queue_io_min(mddev->queue, mddev->chunk_sectors << 9);
blk_queue_io_opt(mddev->queue,
(mddev->chunk_sectors << 9) * mddev->raid_disks);
printk(KERN_INFO "raid0: done.\n");
mddev->private = conf;
return 0;

9
drivers/md/raid1.c
View File

@ -1123,8 +1123,8 @@ static int raid1_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
for (mirror = first; mirror <= last; mirror++)
if ( !(p=conf->mirrors+mirror)->rdev) {
blk_queue_stack_limits(mddev->queue,
rdev->bdev->bd_disk->queue);
disk_stack_limits(mddev->gendisk, rdev->bdev,
rdev->data_offset << 9);
/* as we don't honour merge_bvec_fn, we must never risk
* violating it, so limit ->max_sector to one PAGE, as
* a one page request is never in violation.
@ -1988,9 +1988,8 @@ static int run(mddev_t *mddev)
disk = conf->mirrors + disk_idx;
disk->rdev = rdev;
blk_queue_stack_limits(mddev->queue,
rdev->bdev->bd_disk->queue);
disk_stack_limits(mddev->gendisk, rdev->bdev,
rdev->data_offset << 9);
/* as we don't honour merge_bvec_fn, we must never risk
* violating it, so limit ->max_sector to one PAGE, as
* a one page request is never in violation.

19
drivers/md/raid10.c
View File

@ -1151,8 +1151,8 @@ static int raid10_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
for ( ; mirror <= last ; mirror++)
if ( !(p=conf->mirrors+mirror)->rdev) {
blk_queue_stack_limits(mddev->queue,
rdev->bdev->bd_disk->queue);
disk_stack_limits(mddev->gendisk, rdev->bdev,
rdev->data_offset << 9);
/* as we don't honour merge_bvec_fn, we must never risk
* violating it, so limit ->max_sector to one PAGE, as
* a one page request is never in violation.
@ -2044,7 +2044,7 @@ raid10_size(mddev_t *mddev, sector_t sectors, int raid_disks)
static int run(mddev_t *mddev)
{
conf_t *conf;
int i, disk_idx;
int i, disk_idx, chunk_size;
mirror_info_t *disk;
mdk_rdev_t *rdev;
int nc, fc, fo;
@ -2130,6 +2130,14 @@ static int run(mddev_t *mddev)
spin_lock_init(&conf->device_lock);
mddev->queue->queue_lock = &conf->device_lock;
chunk_size = mddev->chunk_sectors << 9;
blk_queue_io_min(mddev->queue, chunk_size);
if (conf->raid_disks % conf->near_copies)
blk_queue_io_opt(mddev->queue, chunk_size * conf->raid_disks);
else
blk_queue_io_opt(mddev->queue, chunk_size *
(conf->raid_disks / conf->near_copies));
list_for_each_entry(rdev, &mddev->disks, same_set) {
disk_idx = rdev->raid_disk;
if (disk_idx >= mddev->raid_disks
@ -2138,9 +2146,8 @@ static int run(mddev_t *mddev)
disk = conf->mirrors + disk_idx;
disk->rdev = rdev;
blk_queue_stack_limits(mddev->queue,
rdev->bdev->bd_disk->queue);
disk_stack_limits(mddev->gendisk, rdev->bdev,
rdev->data_offset << 9);
/* as we don't honour merge_bvec_fn, we must never risk
* violating it, so limit ->max_sector to one PAGE, as
* a one page request is never in violation.

28
drivers/md/raid5.c
View File

@ -3699,13 +3699,21 @@ static int make_request(struct request_queue *q, struct bio * bi)
goto retry;
}
}
/* FIXME what if we get a false positive because these
* are being updated.
*/
if (logical_sector >= mddev->suspend_lo &&
if (bio_data_dir(bi) == WRITE &&
logical_sector >= mddev->suspend_lo &&
logical_sector < mddev->suspend_hi) {
release_stripe(sh);
schedule();
/* As the suspend_* range is controlled by
* userspace, we want an interruptible
* wait.
*/
flush_signals(current);
prepare_to_wait(&conf->wait_for_overlap,
&w, TASK_INTERRUPTIBLE);
if (logical_sector >= mddev->suspend_lo &&
logical_sector < mddev->suspend_hi)
schedule();
goto retry;
}
@ -4452,7 +4460,7 @@ static raid5_conf_t *setup_conf(mddev_t *mddev)
static int run(mddev_t *mddev)
{
raid5_conf_t *conf;
int working_disks = 0;
int working_disks = 0, chunk_size;
mdk_rdev_t *rdev;
if (mddev->recovery_cp != MaxSector)
@ -4607,6 +4615,14 @@ static int run(mddev_t *mddev)
md_set_array_sectors(mddev, raid5_size(mddev, 0, 0));
blk_queue_merge_bvec(mddev->queue, raid5_mergeable_bvec);
chunk_size = mddev->chunk_sectors << 9;
blk_queue_io_min(mddev->queue, chunk_size);
blk_queue_io_opt(mddev->queue, chunk_size *
(conf->raid_disks - conf->max_degraded));
list_for_each_entry(rdev, &mddev->disks, same_set)
disk_stack_limits(mddev->gendisk, rdev->bdev,
rdev->data_offset << 9);
return 0;
abort: