diff options
Diffstat (limited to 'drivers/md/md.c')
| -rw-r--r-- | drivers/md/md.c | 112 |
1 files changed, 105 insertions, 7 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c index 76ba69b31d6a..923d1250b9a9 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -387,6 +387,11 @@ static inline int mddev_lock(mddev_t * mddev) return mutex_lock_interruptible(&mddev->reconfig_mutex); } +static inline int mddev_is_locked(mddev_t *mddev) +{ + return mutex_is_locked(&mddev->reconfig_mutex); +} + static inline int mddev_trylock(mddev_t * mddev) { return mutex_trylock(&mddev->reconfig_mutex); @@ -2282,16 +2287,34 @@ static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) return 1; } +static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) +{ + unsigned long long blocks; + sector_t new; + + if (strict_strtoull(buf, 10, &blocks) < 0) + return -EINVAL; + + if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) + return -EINVAL; /* sector conversion overflow */ + + new = blocks * 2; + if (new != blocks * 2) + return -EINVAL; /* unsigned long long to sector_t overflow */ + + *sectors = new; + return 0; +} + static ssize_t rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len) { mddev_t *my_mddev = rdev->mddev; sector_t oldsectors = rdev->sectors; - unsigned long long sectors; + sector_t sectors; - if (strict_strtoull(buf, 10, §ors) < 0) + if (strict_blocks_to_sectors(buf, §ors) < 0) return -EINVAL; - sectors *= 2; if (my_mddev->pers && rdev->raid_disk >= 0) { if (my_mddev->persistent) { sectors = super_types[my_mddev->major_version]. @@ -3182,12 +3205,11 @@ size_store(mddev_t *mddev, const char *buf, size_t len) * not increase it (except from 0). * If array is active, we can try an on-line resize */ - unsigned long long sectors; - int err = strict_strtoull(buf, 10, §ors); + sector_t sectors; + int err = strict_blocks_to_sectors(buf, §ors); if (err < 0) return err; - sectors *= 2; if (mddev->pers) { err = update_size(mddev, sectors); md_update_sb(mddev, 1); @@ -3627,6 +3649,57 @@ static struct md_sysfs_entry md_reshape_position = __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, reshape_position_store); +static ssize_t +array_size_show(mddev_t *mddev, char *page) +{ + if (mddev->external_size) + return sprintf(page, "%llu\n", + (unsigned long long)mddev->array_sectors/2); + else + return sprintf(page, "default\n"); +} + +static ssize_t +array_size_store(mddev_t *mddev, const char *buf, size_t len) +{ + sector_t sectors; + + if (strncmp(buf, "default", 7) == 0) { + if (mddev->pers) + sectors = mddev->pers->size(mddev, 0, 0); + else + sectors = mddev->array_sectors; + + mddev->external_size = 0; + } else { + if (strict_blocks_to_sectors(buf, §ors) < 0) + return -EINVAL; + if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) + return -EINVAL; + + mddev->external_size = 1; + } + + mddev->array_sectors = sectors; + set_capacity(mddev->gendisk, mddev->array_sectors); + if (mddev->pers) { + struct block_device *bdev = bdget_disk(mddev->gendisk, 0); + + if (bdev) { + mutex_lock(&bdev->bd_inode->i_mutex); + i_size_write(bdev->bd_inode, + (loff_t)mddev->array_sectors << 9); + mutex_unlock(&bdev->bd_inode->i_mutex); + bdput(bdev); + } + } + + return len; +} + +static struct md_sysfs_entry md_array_size = +__ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, + array_size_store); static struct attribute *md_default_attrs[] = { &md_level.attr, @@ -3640,6 +3713,7 @@ static struct attribute *md_default_attrs[] = { &md_safe_delay.attr, &md_array_state.attr, &md_reshape_position.attr, + &md_array_size.attr, NULL, }; @@ -4045,7 +4119,17 @@ static int do_md_run(mddev_t * mddev) err = mddev->pers->run(mddev); if (err) printk(KERN_ERR "md: pers->run() failed ...\n"); - else if (mddev->pers->sync_request) { + else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) { + WARN_ONCE(!mddev->external_size, "%s: default size too small," + " but 'external_size' not in effect?\n", __func__); + printk(KERN_ERR + "md: invalid array_size %llu > default size %llu\n", + (unsigned long long)mddev->array_sectors / 2, + (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2); + err = -EINVAL; + mddev->pers->stop(mddev); + } + if (err == 0 && mddev->pers->sync_request) { err = bitmap_create(mddev); if (err) { printk(KERN_ERR "%s: failed to create bitmap (%d)\n", @@ -4281,6 +4365,7 @@ static int do_md_stop(mddev_t * mddev, int mode, int is_open) export_array(mddev); mddev->array_sectors = 0; + mddev->external_size = 0; mddev->dev_sectors = 0; mddev->raid_disks = 0; mddev->recovery_cp = 0; @@ -4979,10 +5064,23 @@ static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors) { + WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__); + + if (mddev->external_size) + return; + mddev->array_sectors = array_sectors; } EXPORT_SYMBOL(md_set_array_sectors); +void md_set_array_sectors_lock(mddev_t *mddev, sector_t array_sectors) +{ + mddev_lock(mddev); + md_set_array_sectors(mddev, array_sectors); + mddev_unlock(mddev); +} +EXPORT_SYMBOL(md_set_array_sectors_lock); + static int update_size(mddev_t *mddev, sector_t num_sectors) { mdk_rdev_t *rdev; 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