diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2015-06-29 11:10:56 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-06-29 11:10:56 -0700 |
commit | 6aaf0da8728c55ff627619f933ed161cc89057c6 (patch) | |
tree | 68c5aea6374e0bf56bf9235d4684c0f6c7a29f26 | |
parent | a9730fca9946f3697410479e0ef1bd759ba00a77 (diff) | |
parent | ab16bfc732c436658d13455f28b0b4a2608a7476 (diff) | |
download | op-kernel-dev-6aaf0da8728c55ff627619f933ed161cc89057c6.zip op-kernel-dev-6aaf0da8728c55ff627619f933ed161cc89057c6.tar.gz |
Merge tag 'md/4.2' of git://neil.brown.name/md
Pull md updates from Neil Brown:
"A mixed bag
- a few bug fixes
- some performance improvement that decrease lock contention
- some clean-up
Nothing major"
* tag 'md/4.2' of git://neil.brown.name/md:
md: clear Blocked flag on failed devices when array is read-only.
md: unlock mddev_lock on an error path.
md: clear mddev->private when it has been freed.
md: fix a build warning
md/raid5: ignore released_stripes check
md/raid5: per hash value and exclusive wait_for_stripe
md/raid5: split wait_for_stripe and introduce wait_for_quiescent
wait: introduce wait_event_exclusive_cmd
md: convert to kstrto*()
md/raid10: make sync_request_write() call bio_copy_data()
-rw-r--r-- | drivers/md/md.c | 167 | ||||
-rw-r--r-- | drivers/md/raid10.c | 18 | ||||
-rw-r--r-- | drivers/md/raid5.c | 46 | ||||
-rw-r--r-- | drivers/md/raid5.h | 3 | ||||
-rw-r--r-- | include/linux/wait.h | 13 |
5 files changed, 146 insertions, 101 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c index 8d9f89b..df92d30 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -2628,13 +2628,14 @@ errors_show(struct md_rdev *rdev, char *page) static ssize_t errors_store(struct md_rdev *rdev, const char *buf, size_t len) { - char *e; - unsigned long n = simple_strtoul(buf, &e, 10); - if (*buf && (*e == 0 || *e == '\n')) { - atomic_set(&rdev->corrected_errors, n); - return len; - } - return -EINVAL; + unsigned int n; + int rv; + + rv = kstrtouint(buf, 10, &n); + if (rv < 0) + return rv; + atomic_set(&rdev->corrected_errors, n); + return len; } static struct rdev_sysfs_entry rdev_errors = __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); @@ -2651,13 +2652,16 @@ slot_show(struct md_rdev *rdev, char *page) static ssize_t slot_store(struct md_rdev *rdev, const char *buf, size_t len) { - char *e; + int slot; int err; - int slot = simple_strtoul(buf, &e, 10); + if (strncmp(buf, "none", 4)==0) slot = -1; - else if (e==buf || (*e && *e!= '\n')) - return -EINVAL; + else { + err = kstrtouint(buf, 10, (unsigned int *)&slot); + if (err < 0) + return err; + } if (rdev->mddev->pers && slot == -1) { /* Setting 'slot' on an active array requires also * updating the 'rd%d' link, and communicating @@ -3542,12 +3546,12 @@ layout_show(struct mddev *mddev, char *page) static ssize_t layout_store(struct mddev *mddev, const char *buf, size_t len) { - char *e; - unsigned long n = simple_strtoul(buf, &e, 10); + unsigned int n; int err; - if (!*buf || (*e && *e != '\n')) - return -EINVAL; + err = kstrtouint(buf, 10, &n); + if (err < 0) + return err; err = mddev_lock(mddev); if (err) return err; @@ -3591,12 +3595,12 @@ static int update_raid_disks(struct mddev *mddev, int raid_disks); static ssize_t raid_disks_store(struct mddev *mddev, const char *buf, size_t len) { - char *e; + unsigned int n; int err; - unsigned long n = simple_strtoul(buf, &e, 10); - if (!*buf || (*e && *e != '\n')) - return -EINVAL; + err = kstrtouint(buf, 10, &n); + if (err < 0) + return err; err = mddev_lock(mddev); if (err) @@ -3643,12 +3647,12 @@ chunk_size_show(struct mddev *mddev, char *page) static ssize_t chunk_size_store(struct mddev *mddev, const char *buf, size_t len) { + unsigned long n; int err; - char *e; - unsigned long n = simple_strtoul(buf, &e, 10); - if (!*buf || (*e && *e != '\n')) - return -EINVAL; + err = kstrtoul(buf, 10, &n); + if (err < 0) + return err; err = mddev_lock(mddev); if (err) @@ -3686,19 +3690,24 @@ resync_start_show(struct mddev *mddev, char *page) static ssize_t resync_start_store(struct mddev *mddev, const char *buf, size_t len) { + unsigned long long n; int err; - char *e; - unsigned long long n = simple_strtoull(buf, &e, 10); + + if (cmd_match(buf, "none")) + n = MaxSector; + else { + err = kstrtoull(buf, 10, &n); + if (err < 0) + return err; + if (n != (sector_t)n) + return -EINVAL; + } err = mddev_lock(mddev); if (err) return err; if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) err = -EBUSY; - else if (cmd_match(buf, "none")) - n = MaxSector; - else if (!*buf || (*e && *e != '\n')) - err = -EINVAL; if (!err) { mddev->recovery_cp = n; @@ -3934,14 +3943,14 @@ max_corrected_read_errors_show(struct mddev *mddev, char *page) { static ssize_t max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len) { - char *e; - unsigned long n = simple_strtoul(buf, &e, 10); + unsigned int n; + int rv; - if (*buf && (*e == 0 || *e == '\n')) { - atomic_set(&mddev->max_corr_read_errors, n); - return len; - } - return -EINVAL; + rv = kstrtouint(buf, 10, &n); + if (rv < 0) + return rv; + atomic_set(&mddev->max_corr_read_errors, n); + return len; } static struct md_sysfs_entry max_corr_read_errors = @@ -4003,8 +4012,10 @@ new_dev_store(struct mddev *mddev, const char *buf, size_t len) else rdev = md_import_device(dev, -1, -1); - if (IS_ERR(rdev)) + if (IS_ERR(rdev)) { + mddev_unlock(mddev); return PTR_ERR(rdev); + } err = bind_rdev_to_array(rdev, mddev); out: if (err) @@ -4298,15 +4309,18 @@ sync_min_show(struct mddev *mddev, char *page) static ssize_t sync_min_store(struct mddev *mddev, const char *buf, size_t len) { - int min; - char *e; + unsigned int min; + int rv; + if (strncmp(buf, "system", 6)==0) { - mddev->sync_speed_min = 0; - return len; + min = 0; + } else { + rv = kstrtouint(buf, 10, &min); + if (rv < 0) + return rv; + if (min == 0) + return -EINVAL; } - min = simple_strtoul(buf, &e, 10); - if (buf == e || (*e && *e != '\n') || min <= 0) - return -EINVAL; mddev->sync_speed_min = min; return len; } @@ -4324,15 +4338,18 @@ sync_max_show(struct mddev *mddev, char *page) static ssize_t sync_max_store(struct mddev *mddev, const char *buf, size_t len) { - int max; - char *e; + unsigned int max; + int rv; + if (strncmp(buf, "system", 6)==0) { - mddev->sync_speed_max = 0; - return len; + max = 0; + } else { + rv = kstrtouint(buf, 10, &max); + if (rv < 0) + return rv; + if (max == 0) + return -EINVAL; } - max = simple_strtoul(buf, &e, 10); - if (buf == e || (*e && *e != '\n') || max <= 0) - return -EINVAL; mddev->sync_speed_max = max; return len; } @@ -4515,12 +4532,13 @@ suspend_lo_show(struct mddev *mddev, char *page) static ssize_t suspend_lo_store(struct mddev *mddev, const char *buf, size_t len) { - char *e; - unsigned long long new = simple_strtoull(buf, &e, 10); - unsigned long long old; + unsigned long long old, new; int err; - if (buf == e || (*e && *e != '\n')) + err = kstrtoull(buf, 10, &new); + if (err < 0) + return err; + if (new != (sector_t)new) return -EINVAL; err = mddev_lock(mddev); @@ -4557,12 +4575,13 @@ suspend_hi_show(struct mddev *mddev, char *page) static ssize_t suspend_hi_store(struct mddev *mddev, const char *buf, size_t len) { - char *e; - unsigned long long new = simple_strtoull(buf, &e, 10); - unsigned long long old; + unsigned long long old, new; int err; - if (buf == e || (*e && *e != '\n')) + err = kstrtoull(buf, 10, &new); + if (err < 0) + return err; + if (new != (sector_t)new) return -EINVAL; err = mddev_lock(mddev); @@ -4604,11 +4623,13 @@ static ssize_t reshape_position_store(struct mddev *mddev, const char *buf, size_t len) { struct md_rdev *rdev; - char *e; + unsigned long long new; int err; - unsigned long long new = simple_strtoull(buf, &e, 10); - if (buf == e || (*e && *e != '\n')) + err = kstrtoull(buf, 10, &new); + if (err < 0) + return err; + if (new != (sector_t)new) return -EINVAL; err = mddev_lock(mddev); if (err) @@ -5157,6 +5178,7 @@ int md_run(struct mddev *mddev) mddev_detach(mddev); if (mddev->private) pers->free(mddev, mddev->private); + mddev->private = NULL; module_put(pers->owner); bitmap_destroy(mddev); return err; @@ -5292,6 +5314,7 @@ static void md_clean(struct mddev *mddev) mddev->changed = 0; mddev->degraded = 0; mddev->safemode = 0; + mddev->private = NULL; mddev->merge_check_needed = 0; mddev->bitmap_info.offset = 0; mddev->bitmap_info.default_offset = 0; @@ -5364,6 +5387,7 @@ static void __md_stop(struct mddev *mddev) mddev->pers = NULL; spin_unlock(&mddev->lock); pers->free(mddev, mddev->private); + mddev->private = NULL; if (pers->sync_request && mddev->to_remove == NULL) mddev->to_remove = &md_redundancy_group; module_put(pers->owner); @@ -6373,7 +6397,7 @@ static int update_array_info(struct mddev *mddev, mdu_array_info_t *info) mddev->ctime != info->ctime || mddev->level != info->level || /* mddev->layout != info->layout || */ - !mddev->persistent != info->not_persistent|| + mddev->persistent != !info->not_persistent || mddev->chunk_sectors != info->chunk_size >> 9 || /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ ((state^info->state) & 0xfffffe00) @@ -8104,6 +8128,15 @@ void md_check_recovery(struct mddev *mddev) int spares = 0; if (mddev->ro) { + struct md_rdev *rdev; + if (!mddev->external && mddev->in_sync) + /* 'Blocked' flag not needed as failed devices + * will be recorded if array switched to read/write. + * Leaving it set will prevent the device + * from being removed. + */ + rdev_for_each(rdev, mddev) + clear_bit(Blocked, &rdev->flags); /* On a read-only array we can: * - remove failed devices * - add already-in_sync devices if the array itself @@ -9011,13 +9044,7 @@ static int get_ro(char *buffer, struct kernel_param *kp) } static int set_ro(const char *val, struct kernel_param *kp) { - char *e; - int num = simple_strtoul(val, &e, 10); - if (*val && (*e == '\0' || *e == '\n')) { - start_readonly = num; - return 0; - } - return -EINVAL; + return kstrtouint(val, 10, (unsigned int *)&start_readonly); } module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c index 188d8e9..940f2f3 100644 --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -2099,17 +2099,10 @@ static void sync_request_write(struct mddev *mddev, struct r10bio *r10_bio) tbio->bi_rw = WRITE; tbio->bi_private = r10_bio; tbio->bi_iter.bi_sector = r10_bio->devs[i].addr; - - for (j=0; j < vcnt ; j++) { - tbio->bi_io_vec[j].bv_offset = 0; - tbio->bi_io_vec[j].bv_len = PAGE_SIZE; - - memcpy(page_address(tbio->bi_io_vec[j].bv_page), - page_address(fbio->bi_io_vec[j].bv_page), - PAGE_SIZE); - } tbio->bi_end_io = end_sync_write; + bio_copy_data(tbio, fbio); + d = r10_bio->devs[i].devnum; atomic_inc(&conf->mirrors[d].rdev->nr_pending); atomic_inc(&r10_bio->remaining); @@ -2124,17 +2117,14 @@ static void sync_request_write(struct mddev *mddev, struct r10bio *r10_bio) * that are active */ for (i = 0; i < conf->copies; i++) { - int j, d; + int d; tbio = r10_bio->devs[i].repl_bio; if (!tbio || !tbio->bi_end_io) continue; if (r10_bio->devs[i].bio->bi_end_io != end_sync_write && r10_bio->devs[i].bio != fbio) - for (j = 0; j < vcnt; j++) - memcpy(page_address(tbio->bi_io_vec[j].bv_page), - page_address(fbio->bi_io_vec[j].bv_page), - PAGE_SIZE); + bio_copy_data(tbio, fbio); d = r10_bio->devs[i].devnum; atomic_inc(&r10_bio->remaining); md_sync_acct(conf->mirrors[d].replacement->bdev, diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index b6793d2..59e44e9 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -344,7 +344,8 @@ static void release_inactive_stripe_list(struct r5conf *conf, int hash) { int size; - bool do_wakeup = false; + unsigned long do_wakeup = 0; + int i = 0; unsigned long flags; if (hash == NR_STRIPE_HASH_LOCKS) { @@ -365,15 +366,21 @@ static void release_inactive_stripe_list(struct r5conf *conf, !list_empty(list)) atomic_dec(&conf->empty_inactive_list_nr); list_splice_tail_init(list, conf->inactive_list + hash); - do_wakeup = true; + do_wakeup |= 1 << hash; spin_unlock_irqrestore(conf->hash_locks + hash, flags); } size--; hash--; } + for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++) { + if (do_wakeup & (1 << i)) + wake_up(&conf->wait_for_stripe[i]); + } + if (do_wakeup) { - wake_up(&conf->wait_for_stripe); + if (atomic_read(&conf->active_stripes) == 0) + wake_up(&conf->wait_for_quiescent); if (conf->retry_read_aligned) md_wakeup_thread(conf->mddev->thread); } @@ -667,15 +674,15 @@ get_active_stripe(struct r5conf *conf, sector_t sector, spin_lock_irq(conf->hash_locks + hash); do { - wait_event_lock_irq(conf->wait_for_stripe, + wait_event_lock_irq(conf->wait_for_quiescent, conf->quiesce == 0 || noquiesce, *(conf->hash_locks + hash)); sh = __find_stripe(conf, sector, conf->generation - previous); if (!sh) { if (!test_bit(R5_INACTIVE_BLOCKED, &conf->cache_state)) { sh = get_free_stripe(conf, hash); - if (!sh && llist_empty(&conf->released_stripes) && - !test_bit(R5_DID_ALLOC, &conf->cache_state)) + if (!sh && !test_bit(R5_DID_ALLOC, + &conf->cache_state)) set_bit(R5_ALLOC_MORE, &conf->cache_state); } @@ -684,14 +691,15 @@ get_active_stripe(struct r5conf *conf, sector_t sector, if (!sh) { set_bit(R5_INACTIVE_BLOCKED, &conf->cache_state); - wait_event_lock_irq( - conf->wait_for_stripe, + wait_event_exclusive_cmd( + conf->wait_for_stripe[hash], !list_empty(conf->inactive_list + hash) && (atomic_read(&conf->active_stripes) < (conf->max_nr_stripes * 3 / 4) || !test_bit(R5_INACTIVE_BLOCKED, &conf->cache_state)), - *(conf->hash_locks + hash)); + spin_unlock_irq(conf->hash_locks + hash), + spin_lock_irq(conf->hash_locks + hash)); clear_bit(R5_INACTIVE_BLOCKED, &conf->cache_state); } else { @@ -716,6 +724,9 @@ get_active_stripe(struct r5conf *conf, sector_t sector, } } while (sh == NULL); + if (!list_empty(conf->inactive_list + hash)) + wake_up(&conf->wait_for_stripe[hash]); + spin_unlock_irq(conf->hash_locks + hash); return sh; } @@ -2177,7 +2188,7 @@ static int resize_stripes(struct r5conf *conf, int newsize) cnt = 0; list_for_each_entry(nsh, &newstripes, lru) { lock_device_hash_lock(conf, hash); - wait_event_cmd(conf->wait_for_stripe, + wait_event_exclusive_cmd(conf->wait_for_stripe[hash], !list_empty(conf->inactive_list + hash), unlock_device_hash_lock(conf, hash), lock_device_hash_lock(conf, hash)); @@ -4760,7 +4771,7 @@ static void raid5_align_endio(struct bio *bi, int error) raid_bi, 0); bio_endio(raid_bi, 0); if (atomic_dec_and_test(&conf->active_aligned_reads)) - wake_up(&conf->wait_for_stripe); + wake_up(&conf->wait_for_quiescent); return; } @@ -4855,7 +4866,7 @@ static int chunk_aligned_read(struct mddev *mddev, struct bio * raid_bio) align_bi->bi_iter.bi_sector += rdev->data_offset; spin_lock_irq(&conf->device_lock); - wait_event_lock_irq(conf->wait_for_stripe, + wait_event_lock_irq(conf->wait_for_quiescent, conf->quiesce == 0, conf->device_lock); atomic_inc(&conf->active_aligned_reads); @@ -5699,7 +5710,7 @@ static int retry_aligned_read(struct r5conf *conf, struct bio *raid_bio) bio_endio(raid_bio, 0); } if (atomic_dec_and_test(&conf->active_aligned_reads)) - wake_up(&conf->wait_for_stripe); + wake_up(&conf->wait_for_quiescent); return handled; } @@ -6433,7 +6444,10 @@ static struct r5conf *setup_conf(struct mddev *mddev) goto abort; spin_lock_init(&conf->device_lock); seqcount_init(&conf->gen_lock); - init_waitqueue_head(&conf->wait_for_stripe); + init_waitqueue_head(&conf->wait_for_quiescent); + for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++) { + init_waitqueue_head(&conf->wait_for_stripe[i]); + } init_waitqueue_head(&conf->wait_for_overlap); INIT_LIST_HEAD(&conf->handle_list); INIT_LIST_HEAD(&conf->hold_list); @@ -7466,7 +7480,7 @@ static void raid5_quiesce(struct mddev *mddev, int state) * active stripes can drain */ conf->quiesce = 2; - wait_event_cmd(conf->wait_for_stripe, + wait_event_cmd(conf->wait_for_quiescent, atomic_read(&conf->active_stripes) == 0 && atomic_read(&conf->active_aligned_reads) == 0, unlock_all_device_hash_locks_irq(conf), @@ -7480,7 +7494,7 @@ static void raid5_quiesce(struct mddev *mddev, int state) case 0: /* re-enable writes */ lock_all_device_hash_locks_irq(conf); conf->quiesce = 0; - wake_up(&conf->wait_for_stripe); + wake_up(&conf->wait_for_quiescent); wake_up(&conf->wait_for_overlap); unlock_all_device_hash_locks_irq(conf); break; diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h index 896d603..02c3bf8 100644 --- a/drivers/md/raid5.h +++ b/drivers/md/raid5.h @@ -511,7 +511,8 @@ struct r5conf { struct list_head inactive_list[NR_STRIPE_HASH_LOCKS]; atomic_t empty_inactive_list_nr; struct llist_head released_stripes; - wait_queue_head_t wait_for_stripe; + wait_queue_head_t wait_for_quiescent; + wait_queue_head_t wait_for_stripe[NR_STRIPE_HASH_LOCKS]; wait_queue_head_t wait_for_overlap; unsigned long cache_state; #define R5_INACTIVE_BLOCKED 1 /* release of inactive stripes blocked, diff --git a/include/linux/wait.h b/include/linux/wait.h index d69ac4e..1e1bf9f 100644 --- a/include/linux/wait.h +++ b/include/linux/wait.h @@ -358,6 +358,19 @@ do { \ __ret; \ }) +#define __wait_event_exclusive_cmd(wq, condition, cmd1, cmd2) \ + (void)___wait_event(wq, condition, TASK_UNINTERRUPTIBLE, 1, 0, \ + cmd1; schedule(); cmd2) +/* + * Just like wait_event_cmd(), except it sets exclusive flag + */ +#define wait_event_exclusive_cmd(wq, condition, cmd1, cmd2) \ +do { \ + if (condition) \ + break; \ + __wait_event_exclusive_cmd(wq, condition, cmd1, cmd2); \ +} while (0) + #define __wait_event_cmd(wq, condition, cmd1, cmd2) \ (void)___wait_event(wq, condition, TASK_UNINTERRUPTIBLE, 0, 0, \ cmd1; schedule(); cmd2) |