diff options
Diffstat (limited to 'drivers/md/md.c')
| -rw-r--r-- | drivers/md/md.c | 636 |
1 files changed, 520 insertions, 116 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c index 9ecf51ee596f..adf960d8a7c9 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -131,6 +131,8 @@ static ctl_table raid_root_table[] = { static struct block_device_operations md_fops; +static int start_readonly; + /* * Enables to iterate over all existing md arrays * all_mddevs_lock protects this list. @@ -181,7 +183,7 @@ static void mddev_put(mddev_t *mddev) if (!mddev->raid_disks && list_empty(&mddev->disks)) { list_del(&mddev->all_mddevs); blk_put_queue(mddev->queue); - kfree(mddev); + kobject_unregister(&mddev->kobj); } spin_unlock(&all_mddevs_lock); } @@ -330,18 +332,46 @@ static void free_disk_sb(mdk_rdev_t * rdev) static int super_written(struct bio *bio, unsigned int bytes_done, int error) { mdk_rdev_t *rdev = bio->bi_private; + mddev_t *mddev = rdev->mddev; if (bio->bi_size) return 1; if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) - md_error(rdev->mddev, rdev); + md_error(mddev, rdev); - if (atomic_dec_and_test(&rdev->mddev->pending_writes)) - wake_up(&rdev->mddev->sb_wait); + if (atomic_dec_and_test(&mddev->pending_writes)) + wake_up(&mddev->sb_wait); bio_put(bio); return 0; } +static int super_written_barrier(struct bio *bio, unsigned int bytes_done, int error) +{ + struct bio *bio2 = bio->bi_private; + mdk_rdev_t *rdev = bio2->bi_private; + mddev_t *mddev = rdev->mddev; + if (bio->bi_size) + return 1; + + if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && + error == -EOPNOTSUPP) { + unsigned long flags; + /* barriers don't appear to be supported :-( */ + set_bit(BarriersNotsupp, &rdev->flags); + mddev->barriers_work = 0; + spin_lock_irqsave(&mddev->write_lock, flags); + bio2->bi_next = mddev->biolist; + mddev->biolist = bio2; + spin_unlock_irqrestore(&mddev->write_lock, flags); + wake_up(&mddev->sb_wait); + bio_put(bio); + return 0; + } + bio_put(bio2); + bio->bi_private = rdev; + return super_written(bio, bytes_done, error); +} + void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, sector_t sector, int size, struct page *page) { @@ -350,16 +380,54 @@ void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, * and decrement it on completion, waking up sb_wait * if zero is reached. * If an error occurred, call md_error + * + * As we might need to resubmit the request if BIO_RW_BARRIER + * causes ENOTSUPP, we allocate a spare bio... */ struct bio *bio = bio_alloc(GFP_NOIO, 1); + int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC); bio->bi_bdev = rdev->bdev; bio->bi_sector = sector; bio_add_page(bio, page, size, 0); bio->bi_private = rdev; bio->bi_end_io = super_written; + bio->bi_rw = rw; + atomic_inc(&mddev->pending_writes); - submit_bio((1<<BIO_RW)|(1<<BIO_RW_SYNC), bio); + if (!test_bit(BarriersNotsupp, &rdev->flags)) { + struct bio *rbio; + rw |= (1<<BIO_RW_BARRIER); + rbio = bio_clone(bio, GFP_NOIO); + rbio->bi_private = bio; + rbio->bi_end_io = super_written_barrier; + submit_bio(rw, rbio); + } else + submit_bio(rw, bio); +} + +void md_super_wait(mddev_t *mddev) +{ + /* wait for all superblock writes that were scheduled to complete. + * if any had to be retried (due to BARRIER problems), retry them + */ + DEFINE_WAIT(wq); + for(;;) { + prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); + if (atomic_read(&mddev->pending_writes)==0) + break; + while (mddev->biolist) { + struct bio *bio; + spin_lock_irq(&mddev->write_lock); + bio = mddev->biolist; + mddev->biolist = bio->bi_next ; + bio->bi_next = NULL; + spin_unlock_irq(&mddev->write_lock); + submit_bio(bio->bi_rw, bio); + } + schedule(); + } + finish_wait(&mddev->sb_wait, &wq); } static int bi_complete(struct bio *bio, unsigned int bytes_done, int error) @@ -610,7 +678,7 @@ static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page); rdev->raid_disk = -1; - rdev->in_sync = 0; + rdev->flags = 0; if (mddev->raid_disks == 0) { mddev->major_version = 0; mddev->minor_version = sb->minor_version; @@ -671,21 +739,19 @@ static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) return 0; if (mddev->level != LEVEL_MULTIPATH) { - rdev->faulty = 0; - rdev->flags = 0; desc = sb->disks + rdev->desc_nr; if (desc->state & (1<<MD_DISK_FAULTY)) - rdev->faulty = 1; + set_bit(Faulty, &rdev->flags); else if (desc->state & (1<<MD_DISK_SYNC) && desc->raid_disk < mddev->raid_disks) { - rdev->in_sync = 1; + set_bit(In_sync, &rdev->flags); rdev->raid_disk = desc->raid_disk; } if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) set_bit(WriteMostly, &rdev->flags); } else /* MULTIPATH are always insync */ - rdev->in_sync = 1; + set_bit(In_sync, &rdev->flags); return 0; } @@ -699,6 +765,7 @@ static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) mdk_rdev_t *rdev2; int next_spare = mddev->raid_disks; + /* make rdev->sb match mddev data.. * * 1/ zero out disks @@ -758,23 +825,27 @@ static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) sb->disks[0].state = (1<<MD_DISK_REMOVED); ITERATE_RDEV(mddev,rdev2,tmp) { mdp_disk_t *d; - if (rdev2->raid_disk >= 0 && rdev2->in_sync && !rdev2->faulty) - rdev2->desc_nr = rdev2->raid_disk; + int desc_nr; + if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) + && !test_bit(Faulty, &rdev2->flags)) + desc_nr = rdev2->raid_disk; else - rdev2->desc_nr = next_spare++; + desc_nr = next_spare++; + rdev2->desc_nr = desc_nr; d = &sb->disks[rdev2->desc_nr]; nr_disks++; d->number = rdev2->desc_nr; d->major = MAJOR(rdev2->bdev->bd_dev); d->minor = MINOR(rdev2->bdev->bd_dev); - if (rdev2->raid_disk >= 0 && rdev->in_sync && !rdev2->faulty) + if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) + && !test_bit(Faulty, &rdev2->flags)) d->raid_disk = rdev2->raid_disk; else d->raid_disk = rdev2->desc_nr; /* compatibility */ - if (rdev2->faulty) { + if (test_bit(Faulty, &rdev2->flags)) { d->state = (1<<MD_DISK_FAULTY); failed++; - } else if (rdev2->in_sync) { + } else if (test_bit(In_sync, &rdev2->flags)) { d->state = (1<<MD_DISK_ACTIVE); d->state |= (1<<MD_DISK_SYNC); active++; @@ -787,7 +858,6 @@ static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) if (test_bit(WriteMostly, &rdev2->flags)) d->state |= (1<<MD_DISK_WRITEMOSTLY); } - /* now set the "removed" and "faulty" bits on any missing devices */ for (i=0 ; i < mddev->raid_disks ; i++) { mdp_disk_t *d = &sb->disks[i]; @@ -944,7 +1014,7 @@ static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); rdev->raid_disk = -1; - rdev->in_sync = 0; + rdev->flags = 0; if (mddev->raid_disks == 0) { mddev->major_version = 1; mddev->patch_version = 0; @@ -996,22 +1066,19 @@ static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); switch(role) { case 0xffff: /* spare */ - rdev->faulty = 0; break; case 0xfffe: /* faulty */ - rdev->faulty = 1; + set_bit(Faulty, &rdev->flags); break; default: - rdev->in_sync = 1; - rdev->faulty = 0; + set_bit(In_sync, &rdev->flags); rdev->raid_disk = role; break; } - rdev->flags = 0; if (sb->devflags & WriteMostly1) set_bit(WriteMostly, &rdev->flags); } else /* MULTIPATH are always insync */ - rdev->in_sync = 1; + set_bit(In_sync, &rdev->flags); return 0; } @@ -1055,9 +1122,9 @@ static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) ITERATE_RDEV(mddev,rdev2,tmp) { i = rdev2->desc_nr; - if (rdev2->faulty) + if (test_bit(Faulty, &rdev2->flags)) sb->dev_roles[i] = cpu_to_le16(0xfffe); - else if (rdev2->in_sync) + else if (test_bit(In_sync, &rdev2->flags)) sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); else sb->dev_roles[i] = cpu_to_le16(0xffff); @@ -1115,6 +1182,7 @@ static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) { mdk_rdev_t *same_pdev; char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; + struct kobject *ko; if (rdev->mddev) { MD_BUG(); @@ -1143,10 +1211,22 @@ static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) if (find_rdev_nr(mddev, rdev->desc_nr)) return -EBUSY; } + bdevname(rdev->bdev,b); + if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0) + return -ENOMEM; list_add(&rdev->same_set, &mddev->disks); rdev->mddev = mddev; - printk(KERN_INFO "md: bind<%s>\n", bdevname(rdev->bdev,b)); + printk(KERN_INFO "md: bind<%s>\n", b); + + rdev->kobj.parent = &mddev->kobj; + kobject_add(&rdev->kobj); + + if (rdev->bdev->bd_part) + ko = &rdev->bdev->bd_part->kobj; + else + ko = &rdev->bdev->bd_disk->kobj; + sysfs_create_link(&rdev->kobj, ko, "block"); return 0; } @@ -1160,6 +1240,8 @@ static void unbind_rdev_from_array(mdk_rdev_t * rdev) list_del_init(&rdev->same_set); printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); rdev->mddev = NULL; + sysfs_remove_link(&rdev->kobj, "block"); + kobject_del(&rdev->kobj); } /* @@ -1215,7 +1297,7 @@ static void export_rdev(mdk_rdev_t * rdev) md_autodetect_dev(rdev->bdev->bd_dev); #endif unlock_rdev(rdev); - kfree(rdev); + kobject_put(&rdev->kobj); } static void kick_rdev_from_array(mdk_rdev_t * rdev) @@ -1287,7 +1369,8 @@ static void print_rdev(mdk_rdev_t *rdev) char b[BDEVNAME_SIZE]; printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n", bdevname(rdev->bdev,b), (unsigned long long)rdev->size, - rdev->faulty, rdev->in_sync, rdev->desc_nr); + test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), + rdev->desc_nr); if (rdev->sb_loaded) { printk(KERN_INFO "md: rdev superblock:\n"); print_sb((mdp_super_t*)page_address(rdev->sb_page)); @@ -1344,7 +1427,7 @@ static void md_update_sb(mddev_t * mddev) int sync_req; repeat: - spin_lock(&mddev->write_lock); + spin_lock_irq(&mddev->write_lock); sync_req = mddev->in_sync; mddev->utime = get_seconds(); mddev->events ++; @@ -1367,11 +1450,11 @@ repeat: */ if (!mddev->persistent) { mddev->sb_dirty = 0; - spin_unlock(&mddev->write_lock); + spin_unlock_irq(&mddev->write_lock); wake_up(&mddev->sb_wait); return; } - spin_unlock(&mddev->write_lock); + spin_unlock_irq(&mddev->write_lock); dprintk(KERN_INFO "md: updating %s RAID superblock on device (in sync %d)\n", @@ -1381,11 +1464,11 @@ repeat: ITERATE_RDEV(mddev,rdev,tmp) { char b[BDEVNAME_SIZE]; dprintk(KERN_INFO "md: "); - if (rdev->faulty) + if (test_bit(Faulty, &rdev->flags)) dprintk("(skipping faulty "); dprintk("%s ", bdevname(rdev->bdev,b)); - if (!rdev->faulty) { + if (!test_bit(Faulty, &rdev->flags)) { md_super_write(mddev,rdev, rdev->sb_offset<<1, rdev->sb_size, rdev->sb_page); @@ -1399,21 +1482,106 @@ repeat: /* only need to write one superblock... */ break; } - wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0); + md_super_wait(mddev); /* if there was a failure, sb_dirty was set to 1, and we re-write super */ - spin_lock(&mddev->write_lock); + spin_lock_irq(&mddev->write_lock); if (mddev->in_sync != sync_req|| mddev->sb_dirty == 1) { /* have to write it out again */ - spin_unlock(&mddev->write_lock); + spin_unlock_irq(&mddev->write_lock); goto repeat; } mddev->sb_dirty = 0; - spin_unlock(&mddev->write_lock); + spin_unlock_irq(&mddev->write_lock); wake_up(&mddev->sb_wait); } +struct rdev_sysfs_entry { + struct attribute attr; + ssize_t (*show)(mdk_rdev_t *, char *); + ssize_t (*store)(mdk_rdev_t *, const char *, size_t); +}; + +static ssize_t +state_show(mdk_rdev_t *rdev, char *page) +{ + char *sep = ""; + int len=0; + + if (test_bit(Faulty, &rdev->flags)) { + len+= sprintf(page+len, "%sfaulty",sep); + sep = ","; + } + if (test_bit(In_sync, &rdev->flags)) { + len += sprintf(page+len, "%sin_sync",sep); + sep = ","; + } + if (!test_bit(Faulty, &rdev->flags) && + !test_bit(In_sync, &rdev->flags)) { + len += sprintf(page+len, "%sspare", sep); + sep = ","; + } + return len+sprintf(page+len, "\n"); +} + +static struct rdev_sysfs_entry +rdev_state = __ATTR_RO(state); + +static ssize_t +super_show(mdk_rdev_t *rdev, char *page) +{ + if (rdev->sb_loaded && rdev->sb_size) { + memcpy(page, page_address(rdev->sb_page), rdev->sb_size); + return rdev->sb_size; + } else + return 0; +} +static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super); + +static struct attribute *rdev_default_attrs[] = { + &rdev_state.attr, + &rdev_super.attr, + NULL, +}; +static ssize_t +rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) +{ + struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); + mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); + + if (!entry->show) + return -EIO; + return entry->show(rdev, page); +} + +static ssize_t +rdev_attr_store(struct kobject *kobj, struct attribute *attr, + const char *page, size_t length) +{ + struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); + mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); + + if (!entry->store) + return -EIO; + return entry->store(rdev, page, length); +} + +static void rdev_free(struct kobject *ko) +{ + mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); + kfree(rdev); +} +static struct sysfs_ops rdev_sysfs_ops = { + .show = rdev_attr_show, + .store = rdev_attr_store, +}; +static struct kobj_type rdev_ktype = { + .release = rdev_free, + .sysfs_ops = &rdev_sysfs_ops, + .default_attrs = rdev_default_attrs, +}; + /* * Import a device. If 'super_format' >= 0, then sanity check the superblock * @@ -1445,11 +1613,15 @@ static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_mi if (err) goto abort_free; + rdev->kobj.parent = NULL; + rdev->kobj.ktype = &rdev_ktype; + kobject_init(&rdev->kobj); + rdev->desc_nr = -1; - rdev->faulty = 0; - rdev->in_sync = 0; + rdev->flags = 0; rdev->data_offset = 0; atomic_set(&rdev->nr_pending, 0); + atomic_set(&rdev->read_errors, 0); size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; if (!size) { @@ -1537,7 +1709,7 @@ static void analyze_sbs(mddev_t * mddev) if (mddev->level == LEVEL_MULTIPATH) { rdev->desc_nr = i++; rdev->raid_disk = rdev->desc_nr; - rdev->in_sync = 1; + set_bit(In_sync, &rdev->flags); } } @@ -1551,6 +1723,162 @@ static void analyze_sbs(mddev_t * mddev) } +static ssize_t +level_show(mddev_t *mddev, char *page) +{ + mdk_personality_t *p = mddev->pers; + if (p == NULL && mddev->raid_disks == 0) + return 0; + if (mddev->level >= 0) + return sprintf(page, "RAID-%d\n", mddev->level); + else + return sprintf(page, "%s\n", p->name); +} + +static struct md_sysfs_entry md_level = __ATTR_RO(level); + +static ssize_t +raid_disks_show(mddev_t *mddev, char *page) +{ + if (mddev->raid_disks == 0) + return 0; + return sprintf(page, "%d\n", mddev->raid_disks); +} + +static struct md_sysfs_entry md_raid_disks = __ATTR_RO(raid_disks); + +static ssize_t +action_show(mddev_t *mddev, char *page) +{ + char *type = "idle"; + if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || + test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) { + if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { + if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) + type = "resync"; + else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) + type = "check"; + else + type = "repair"; + } else + type = "recover"; + } + return sprintf(page, "%s\n", type); +} + +static ssize_t +action_store(mddev_t *mddev, const char *page, size_t len) +{ + if (!mddev->pers || !mddev->pers->sync_request) + return -EINVAL; + + if (strcmp(page, "idle")==0 || strcmp(page, "idle\n")==0) { + if (mddev->sync_thread) { + set_bit(MD_RECOVERY_INTR, &mddev->recovery); + md_unregister_thread(mddev->sync_thread); + mddev->sync_thread = NULL; + mddev->recovery = 0; + } + return len; + } + + if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || + test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) + return -EBUSY; + if (strcmp(page, "resync")==0 || strcmp(page, "resync\n")==0 || + strcmp(page, "recover")==0 || strcmp(page, "recover\n")==0) + set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); + else { + if (strcmp(page, "check")==0 || strcmp(page, "check\n")==0) + set_bit(MD_RECOVERY_CHECK, &mddev->recovery); + else if (strcmp(page, "repair")!=0 && strcmp(page, "repair\n")!=0) + return -EINVAL; + set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); + set_bit(MD_RECOVERY_SYNC, &mddev->recovery); + set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); + } + md_wakeup_thread(mddev->thread); + return len; +} + +static ssize_t +mismatch_cnt_show(mddev_t *mddev, char *page) +{ + return sprintf(page, "%llu\n", + (unsigned long long) mddev->resync_mismatches); +} + +static struct md_sysfs_entry +md_scan_mode = __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); + + +static struct md_sysfs_entry +md_mismatches = __ATTR_RO(mismatch_cnt); + +static struct attribute *md_default_attrs[] = { + &md_level.attr, + &md_raid_disks.attr, + NULL, +}; + +static struct attribute *md_redundancy_attrs[] = { + &md_scan_mode.attr, + &md_mismatches.attr, + NULL, +}; +static struct attribute_group md_redundancy_group = { + .name = NULL, + .attrs = md_redundancy_attrs, +}; + + +static ssize_t +md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) +{ + struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); + mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); + ssize_t rv; + + if (!entry->show) + return -EIO; + mddev_lock(mddev); + rv = entry->show(mddev, page); + mddev_unlock(mddev); + return rv; +} + +static ssize_t +md_attr_store(struct kobject *kobj, struct attribute *attr, + const char *page, size_t length) +{ + struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); + mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); + ssize_t rv; + + if (!entry->store) + return -EIO; + mddev_lock(mddev); + rv = entry->store(mddev, page, length); + mddev_unlock(mddev); + return rv; +} + +static void md_free(struct kobject *ko) +{ + mddev_t *mddev = container_of(ko, mddev_t, kobj); + kfree(mddev); +} + +static struct sysfs_ops md_sysfs_ops = { + .show = md_attr_show, + .store = md_attr_store, +}; +static struct kobj_type md_ktype = { + .release = md_free, + .sysfs_ops = &md_sysfs_ops, + .default_attrs = md_default_attrs, +}; + int mdp_major = 0; static struct kobject *md_probe(dev_t dev, int *part, void *data) @@ -1592,6 +1920,11 @@ static struct kobject *md_probe(dev_t dev, int *part, void *data) add_disk(disk); mddev->gendisk = disk; up(&disks_sem); + mddev->kobj.parent = &disk->kobj; + mddev->kobj.k_name = NULL; + snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md"); + mddev->kobj.ktype = &md_ktype; + kobject_register(&mddev->kobj); return NULL; } @@ -1663,7 +1996,7 @@ static int do_md_run(mddev_t * mddev) /* devices must have minimum size of one chunk */ ITERATE_RDEV(mddev,rdev,tmp) { - if (rdev->faulty) + if (test_bit(Faulty, &rdev->flags)) continue; if (rdev->size < chunk_size / 1024) { printk(KERN_WARNING @@ -1691,7 +2024,7 @@ static int do_md_run(mddev_t * mddev) * Also find largest hardsector size */ ITERATE_RDEV(mddev,rdev,tmp) { - if (rdev->faulty) + if (test_bit(Faulty, &rdev->flags)) continue; sync_blockdev(rdev->bdev); invalidate_bdev(rdev->bdev, 0); @@ -1715,6 +2048,10 @@ static int do_md_run(mddev_t * mddev) mddev->recovery = 0; mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */ + mddev->barriers_work = 1; + + if (start_readonly) + mddev->ro = 2; /* read-only, but switch on first write */ /* before we start the array running, initialise the bitmap */ err = bitmap_create(mddev); @@ -1730,12 +2067,24 @@ static int do_md_run(mddev_t * mddev) bitmap_destroy(mddev); return err; } + if (mddev->pers->sync_request) + sysfs_create_group(&mddev->kobj, &md_redundancy_group); + else if (mddev->ro == 2) /* auto-readonly not meaningful */ + mddev->ro = 0; + atomic_set(&mddev->writes_pending,0); mddev->safemode = 0; mddev->safemode_timer.function = md_safemode_timeout; mddev->safemode_timer.data = (unsigned long) mddev; mddev->safemode_delay = (20 * HZ)/1000 +1; /* 20 msec delay */ mddev->in_sync = 1; + + ITERATE_RDEV(mddev,rdev,tmp) + if (rdev->raid_disk >= 0) { + char nm[20]; + sprintf(nm, "rd%d", rdev->raid_disk); + sysfs_create_link(&mddev->kobj, &rdev->kobj, nm); + } set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); md_wakeup_thread(mddev->thread); @@ -1821,16 +2170,19 @@ static int do_md_stop(mddev_t * mddev, int ro) if (ro) { err = -ENXIO; - if (mddev->ro) + if (mddev->ro==1) goto out; mddev->ro = 1; } else { bitmap_flush(mddev); - wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0); + md_super_wait(mddev); if (mddev->ro) set_disk_ro(disk, 0); blk_queue_make_request(mddev->queue, md_fail_request); mddev->pers->stop(mddev); + if (mddev->pers->sync_request) + sysfs_remove_group(&mddev->kobj, &md_redundancy_group); + module_put(mddev->pers->owner); mddev->pers = NULL; if (mddev->ro) @@ -1857,9 +2209,18 @@ static int do_md_stop(mddev_t * mddev, int ro) * Free resources if final stop */ if (!ro) { + mdk_rdev_t *rdev; + struct list_head *tmp; struct gendisk *disk; printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); + ITERATE_RDEV(mddev,rdev,tmp) + if (rdev->raid_disk >= 0) { + char nm[20]; + sprintf(nm, "rd%d", rdev->raid_disk); + sysfs_remove_link(&mddev->kobj, nm); + } + export_array(mddev); mddev->array_size = 0; @@ -2012,7 +2373,7 @@ static int autostart_array(dev_t startdev) return err; } - if (start_rdev->faulty) { + if (test_bit(Faulty, &start_rdev->flags)) { printk(KERN_WARNING "md: can not autostart based on faulty %s!\n", bdevname(start_rdev->bdev,b)); @@ -2071,11 +2432,11 @@ static int get_array_info(mddev_t * mddev, void __user * arg) nr=working=active=failed=spare=0; ITERATE_RDEV(mddev,rdev,tmp) { nr++; - if (rdev->faulty) + if (test_bit(Faulty, &rdev->flags)) failed++; else { working++; - if (rdev->in_sync) + if (test_bit(In_sync, &rdev->flags)) active++; else spare++; @@ -2166,9 +2527,9 @@ static int get_disk_info(mddev_t * mddev, void __user * arg) info.minor = MINOR(rdev->bdev->bd_dev); info.raid_disk = rdev->raid_disk; info.state = 0; - if (rdev->faulty) + if (test_bit(Faulty, &rdev->flags)) info.state |= (1<<MD_DISK_FAULTY); - else if (rdev->in_sync) { + else if (test_bit(In_sync, &rdev->flags)) { info.state |= (1<<MD_DISK_ACTIVE); info.state |= (1<<MD_DISK_SYNC); } @@ -2261,7 +2622,7 @@ static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) validate_super(mddev, rdev); rdev->saved_raid_disk = rdev->raid_disk; - rdev->in_sync = 0; /* just to be sure */ + clear_bit(In_sync, &rdev->flags); /* just to be sure */ if (info->state & (1<<MD_DISK_WRITEMOSTLY)) set_bit(WriteMostly, &rdev->flags); @@ -2299,11 +2660,11 @@ static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) else rdev->raid_disk = -1; - rdev->faulty = 0; + rdev->flags = 0; + if (rdev->raid_disk < mddev->raid_disks) - rdev->in_sync = (info->state & (1<<MD_DISK_SYNC)); - else - rdev->in_sync = 0; + if (info->state & (1<<MD_DISK_SYNC)) + set_bit(In_sync, &rdev->flags); if (info->state & (1<<MD_DISK_WRITEMOSTLY)) set_bit(WriteMostly, &rdev->flags); @@ -2402,14 +2763,14 @@ static int hot_add_disk(mddev_t * mddev, dev_t dev) goto abort_export; } - if (rdev->faulty) { + if (test_bit(Faulty, &rdev->flags)) { printk(KERN_WARNING "md: can not hot-add faulty %s disk to %s!\n", bdevname(rdev->bdev,b), mdname(mddev)); err = -EINVAL; goto abort_export; } - rdev->in_sync = 0; + clear_bit(In_sync, &rdev->flags); rdev->desc_nr = -1; bind_rdev_to_array(rdev, mddev); @@ -2929,12 +3290,22 @@ static int md_ioctl(struct inode *inode, struct file *file, /* * The remaining ioctls are changing the state of the - * superblock, so we do not allow read-only arrays - * here: + * superblock, so we do not allow them on read-only arrays. + * However non-MD ioctls (e.g. get-size) will still come through + * here and hit the 'default' below, so only disallow + * 'md' ioctls, and switch to rw mode if started auto-readonly. */ - if (mddev->ro) { - err = -EROFS; - goto abort_unlock; + if (_IOC_TYPE(cmd) == MD_MAJOR && + mddev->ro && mddev->pers) { + if (mddev->ro == 2) { + mddev->ro = 0; + set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); + md_wakeup_thread(mddev->thread); + + } else { + err = -EROFS; + goto abort_unlock; + } } switch (cmd) @@ -3064,21 +3435,17 @@ static int md_thread(void * arg) */ allow_signal(SIGKILL); - complete(thread->event); while (!kthread_should_stop()) { - void (*run)(mddev_t *); - wait_event_interruptible_timeout(thread->wqueue, - test_bit(THREAD_WAKEUP, &thread->flags) - || kthread_should_stop(), - thread->timeout); + wait_event_timeout(thread->wqueue, + test_bit(THREAD_WAKEUP, &thread->flags) + || kthread_should_stop(), + thread->timeout); try_to_freeze(); clear_bit(THREAD_WAKEUP, &thread->flags); - run = thread->run; - if (run) - run(thread->mddev); + thread->run(thread->mddev); } return 0; @@ -3097,7 +3464,6 @@ mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, const char *name) { mdk_thread_t *thread; - struct completion event; thread = kmalloc(sizeof(mdk_thread_t), GFP_KERNEL); if (!thread) @@ -3106,18 +3472,14 @@ mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, memset(thread, 0, sizeof(mdk_thread_t)); init_waitqueue_head(&thread->wqueue); - init_completion(&event); - thread->event = &event; thread->run = run; thread->mddev = mddev; - thread->name = name; thread->timeout = MAX_SCHEDULE_TIMEOUT; thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev)); if (IS_ERR(thread->tsk)) { kfree(thread); return NULL; } - wait_for_completion(&event); return thread; } @@ -3136,7 +3498,7 @@ void md_error(mddev_t *mddev, mdk_rdev_t *rdev) return; } - if (!rdev || rdev->faulty) + if (!rdev || test_bit(Faulty, &rdev->flags)) return; /* dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", @@ -3322,8 +3684,10 @@ static int md_seq_show(struct seq_file *seq, void *v) seq_printf(seq, "%s : %sactive", mdname(mddev), mddev->pers ? "" : "in"); if (mddev->pers) { - if (mddev->ro) + if (mddev->ro==1) seq_printf(seq, " (read-only)"); + if (mddev->ro==2) + seq_printf(seq, "(auto-read-only)"); seq_printf(seq, " %s", mddev->pers->name); } @@ -3334,7 +3698,7 @@ static int md_seq_show(struct seq_file *seq, void *v) bdevname(rdev->bdev,b), rdev->desc_nr); if (test_bit(WriteMostly, &rdev->flags)) seq_printf(seq, "(W)"); - if (rdev->faulty) { + if (test_bit(Faulty, &rdev->flags)) { seq_printf(seq, "(F)"); continue; } else if (rdev->raid_disk < 0) @@ -3363,11 +3727,15 @@ static int md_seq_show(struct seq_file *seq, void *v) if (mddev->pers) { mddev->pers->status (seq, mddev); seq_printf(seq, "\n "); - if (mddev->curr_resync > 2) { - status_resync (seq, mddev); - seq_printf(seq, "\n "); - } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) - seq_printf(seq, " resync=DELAYED\n "); + if (mddev->pers->sync_request) { + if (mddev->curr_resync > 2) { + status_resync (seq, mddev); + seq_printf(seq, "\n "); + } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) + seq_printf(seq, "\tresync=DELAYED\n "); + else if (mddev->recovery_cp < MaxSector) + seq_printf(seq, "\tresync=PENDING\n "); + } } else seq_printf(seq, "\n "); @@ -3504,15 +3872,22 @@ void md_write_start(mddev_t *mddev, struct bio *bi) if (bio_data_dir(bi) != WRITE) return; + BUG_ON(mddev->ro == 1); + if (mddev->ro == 2) { + /* need to switch to read/write */ + mddev->ro = 0; + set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); + md_wakeup_thread(mddev->thread); + } atomic_inc(&mddev->writes_pending); if (mddev->in_sync) { - spin_lock(&mddev->write_lock); + spin_lock_irq(&mddev->write_lock); if (mddev->in_sync) { mddev->in_sync = 0; mddev->sb_dirty = 1; md_wakeup_thread(mddev->thread); } - spin_unlock(&mddev->write_lock); + spin_unlock_irq(&mddev->write_lock); } wait_event(mddev->sb_wait, mddev->sb_dirty==0); } @@ -3568,9 +3943,7 @@ static void md_do_sync(mddev_t *mddev) mddev->curr_resync = 2; try_again: - if (signal_pending(current) || - kthread_should_stop()) { - flush_signals(current); + if (kthread_should_stop()) { set_bit(MD_RECOVERY_INTR, &mddev->recovery); goto skip; } @@ -3590,9 +3963,8 @@ static void md_do_sync(mddev_t *mddev) * time 'round when curr_resync == 2 */ continue; - prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); - if (!signal_pending(current) && - !kthread_should_stop() && + prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE); + if (!kthread_should_stop() && mddev2->curr_resync >= mddev->curr_resync) { printk(KERN_INFO "md: delaying resync of %s" " until %s has finished resync (they" @@ -3608,12 +3980,13 @@ static void md_do_sync(mddev_t *mddev) } } while (mddev->curr_resync < 2); - if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) + if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { /* resync follows the size requested by the personality, * which defaults to physical size, but can be virtual size */ max_sectors = mddev->resync_max_sectors; - else + mddev->resync_mismatches = 0; + } else /* recovery follows the physical size of devices */ max_sectors = mddev->size << 1; @@ -3626,7 +3999,8 @@ static void md_do_sync(mddev_t *mddev) is_mddev_idle(mddev); /* this also initializes IO event counters */ /* we don't use the checkpoint if there's a bitmap */ - if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && !mddev->bitmap) + if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && !mddev->bitmap + && ! test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) j = mddev->recovery_cp; else j = 0; @@ -3699,13 +4073,12 @@ static void md_do_sync(mddev_t *mddev) } - if (signal_pending(current) || kthread_should_stop()) { + if (kthread_should_stop()) { /* * got a signal, exit. */ printk(KERN_INFO "md: md_do_sync() got signal ... exiting\n"); - flush_signals(current); set_bit(MD_RECOVERY_INTR, &mddev->recovery); goto out; } @@ -3727,7 +4100,7 @@ static void md_do_sync(mddev_t *mddev) if (currspeed > sysctl_speed_limit_min) { if ((currspeed > sysctl_speed_limit_max) || !is_mddev_idle(mddev)) { - msleep_interruptible(250); + msleep(250); goto repeat; } } @@ -3820,7 +4193,7 @@ void md_check_recovery(mddev_t *mddev) if (mddev_trylock(mddev)==0) { int spares =0; - spin_lock(&mddev->write_lock); + spin_lock_irq(&mddev->write_lock); if (mddev->safemode && !atomic_read(&mddev->writes_pending) && !mddev->in_sync && mddev->recovery_cp == MaxSector) { mddev->in_sync = 1; @@ -3828,7 +4201,7 @@ void md_check_recovery(mddev_t *mddev) } if (mddev->safemode == 1) mddev->safemode = 0; - spin_unlock(&mddev->write_lock); + spin_unlock_irq(&mddev->write_lock); if (mddev->sb_dirty) md_update_sb(mddev); @@ -3864,9 +4237,13 @@ void md_check_recovery(mddev_t *mddev) set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); goto unlock; } - if (mddev->recovery) - /* probably just the RECOVERY_NEEDED flag */ - mddev->recovery = 0; + /* Clear some bits that don't mean anything, but + * might be left set + */ + clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); + clear_bit(MD_RECOVERY_ERR, &mddev->recovery); + clear_bit(MD_RECOVERY_INTR, &mddev->recovery); + clear_bit(MD_RECOVERY_DONE, &mddev->recovery); /* no recovery is running. * remove any failed drives, then @@ -3876,31 +4253,41 @@ void md_check_recovery(mddev_t *mddev) */ ITERATE_RDEV(mddev,rdev,rtmp) if (rdev->raid_disk >= 0 && - (rdev->faulty || ! rdev->in_sync) && + (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) && atomic_read(&rdev->nr_pending)==0) { - if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) + if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) { + char nm[20]; + sprintf(nm,"rd%d", rdev->raid_disk); + sysfs_remove_link(&mddev->kobj, nm); rdev->raid_disk = -1; + } } if (mddev->degraded) { ITERATE_RDEV(mddev,rdev,rtmp) if (rdev->raid_disk < 0 - && !rdev->faulty) { - if (mddev->pers->hot_add_disk(mddev,rdev)) + && !test_bit(Faulty, &rdev->flags)) { + if (mddev->pers->hot_add_disk(mddev,rdev)) { + char nm[20]; + sprintf(nm, "rd%d", rdev->raid_disk); + sysfs_create_link(&mddev->kobj, &rdev->kobj, nm); spares++; - else + } else break; } } - if (!spares && (mddev->recovery_cp == MaxSector )) { - /* nothing we can do ... */ + if (spares) { + clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); + clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); + } else if (mddev->recovery_cp < MaxSector) { + set_bit(MD_RECOVERY_SYNC, &mddev->recovery); + } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) + /* nothing to be done ... */ goto unlock; - } + if (mddev->pers->sync_request) { set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); - if (!spares) - set_bit(MD_RECOVERY_SYNC, &mddev->recovery); if (spares && mddev->bitmap && ! mddev->bitmap->file) { /* We are adding a device or devices to an array * which has the bitmap stored on all devices. @@ -3975,7 +4362,7 @@ static int __init md_init(void) " MD_SB_DISKS=%d\n", MD_MAJOR_VERSION, MD_MINOR_VERSION, MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS); - printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR, + printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR_HI, BITMAP_MINOR); if (register_blkdev(MAJOR_NR, "md")) @@ -4039,7 +4426,7 @@ static void autostart_arrays(int part) if (IS_ERR(rdev)) continue; - if (rdev->faulty) { + if (test_bit(Faulty, &rdev->flags)) { MD_BUG(); continue; } @@ -4086,6 +4473,23 @@ static __exit void md_exit(void) module_init(md_init) module_exit(md_exit) +static int get_ro(char *buffer, struct kernel_param *kp) +{ + return sprintf(buffer, "%d", start_readonly); +} +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; +} + +module_param_call(start_ro, set_ro, get_ro, NULL, 0600); + EXPORT_SYMBOL(register_md_personality); EXPORT_SYMBOL(unregister_md_personality); EXPORT_SYMBOL(md_error); |
