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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>
This commit is contained in:
NeilBrown 2008-02-06 01:39:55 -08:00 committed by Linus Torvalds
parent ca38805945
commit a17184a911
1 changed files with 4 additions and 3 deletions
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7
drivers/md/md.c
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@ -4647,9 +4647,10 @@ static int md_ioctl(struct inode *inode, struct file *file,
*/ */
/* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
* RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY if ((!mddev->raid_disks && !mddev->external)
&& cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
&& cmd != GET_BITMAP_FILE) { && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
&& cmd != GET_BITMAP_FILE) {
err = -ENODEV; err = -ENODEV;
goto abort_unlock; goto abort_unlock;
} }