From 2bf071bf50580380a8c3afe5eef8152a66be96c7 Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Fri, 6 Jan 2006 00:20:55 -0800 Subject: [PATCH] [PATCH] md: keep better track of dev/array size when assembling md arrays Move the checks - that dev size is never less than array size - into bind_rdev_to_array to make sure it always happens properly (there is one place where currently it doesn't). Also reject any superblock which claims an array size smaller than the device in question can hold. Signed-off-by: Neil Brown Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/md/md.c | 41 +++++++++++++++++++++++------------------ 1 file changed, 23 insertions(+), 18 deletions(-) diff --git a/drivers/md/md.c b/drivers/md/md.c index 86e9f2efae5..27a9871f305 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -695,6 +695,10 @@ static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version } rdev->size = calc_dev_size(rdev, sb->chunk_size); + if (rdev->size < sb->size && sb->level > 1) + /* "this cannot possibly happen" ... */ + ret = -EINVAL; + abort: return ret; } @@ -1039,6 +1043,9 @@ static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) rdev->size = le64_to_cpu(sb->data_size)/2; if (le32_to_cpu(sb->chunksize)) rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1); + + if (le32_to_cpu(sb->size) > rdev->size*2) + return -EINVAL; return 0; } @@ -1224,6 +1231,14 @@ static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) MD_BUG(); return -EINVAL; } + /* make sure rdev->size exceeds mddev->size */ + if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) { + if (mddev->pers) + /* Cannot change size, so fail */ + return -ENOSPC; + else + mddev->size = rdev->size; + } same_pdev = match_dev_unit(mddev, rdev); if (same_pdev) printk(KERN_WARNING @@ -2898,12 +2913,6 @@ static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) if (info->state & (1<flags); - err = bind_rdev_to_array(rdev, mddev); - if (err) { - export_rdev(rdev); - return err; - } - if (!mddev->persistent) { printk(KERN_INFO "md: nonpersistent superblock ...\n"); rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; @@ -2911,8 +2920,11 @@ static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) rdev->sb_offset = calc_dev_sboffset(rdev->bdev); rdev->size = calc_dev_size(rdev, mddev->chunk_size); - if (!mddev->size || (mddev->size > rdev->size)) - mddev->size = rdev->size; + err = bind_rdev_to_array(rdev, mddev); + if (err) { + export_rdev(rdev); + return err; + } } return 0; @@ -2984,15 +2996,6 @@ static int hot_add_disk(mddev_t * mddev, dev_t dev) size = calc_dev_size(rdev, mddev->chunk_size); rdev->size = size; - if (size < mddev->size) { - printk(KERN_WARNING - "%s: disk size %llu blocks < array size %llu\n", - mdname(mddev), (unsigned long long)size, - (unsigned long long)mddev->size); - err = -ENOSPC; - goto abort_export; - } - if (test_bit(Faulty, &rdev->flags)) { printk(KERN_WARNING "md: can not hot-add faulty %s disk to %s!\n", @@ -3002,7 +3005,9 @@ static int hot_add_disk(mddev_t * mddev, dev_t dev) } clear_bit(In_sync, &rdev->flags); rdev->desc_nr = -1; - bind_rdev_to_array(rdev, mddev); + err = bind_rdev_to_array(rdev, mddev); + if (err) + goto abort_export; /* * The rest should better be atomic, we can have disk failures -- 2.20.1