md: allow an md array to appear with 0 drives if it has external metadata
Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -4647,9 +4647,10 @@ static int md_ioctl(struct inode *inode, struct file *file,
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*/
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/* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
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* RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
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if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
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&& cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
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&& cmd != GET_BITMAP_FILE) {
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if ((!mddev->raid_disks && !mddev->external)
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&& cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
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&& cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
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&& cmd != GET_BITMAP_FILE) {
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err = -ENODEV;
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goto abort_unlock;
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}
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