OpenE2K
/
linux
6
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[PATCH] md: fix raid10 assembly when too many devices are missing 

If you try to assemble an array with too many missing devices, raid10 will now
reject the attempt, instead of allowing it.

Also check when hot-adding a drive and refuse the hot-add if the array is
beyond hope.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
NeilBrown 2005-09-09 16:24:03 -07:00 committed by Linus Torvalds
parent 611815651b
commit 6d508242b2
1 changed files with 27 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
drivers/md/raid10.c
View File

@ -906,6 +906,27 @@ static void close_sync(conf_t *conf)
conf->r10buf_pool = NULL;
}
/* check if there are enough drives for
* every block to appear on atleast one
*/
static int enough(conf_t *conf)
{
int first = 0;
do {
int n = conf->copies;
int cnt = 0;
while (n--) {
if (conf->mirrors[first].rdev)
cnt++;
first = (first+1) % conf->raid_disks;
}
if (cnt == 0)
return 0;
} while (first != 0);
return 1;
}
static int raid10_spare_active(mddev_t *mddev)
{
int i;
@ -944,6 +965,8 @@ static int raid10_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
* very different from resync
*/
return 0;
if (!enough(conf))
return 0;
for (mirror=0; mirror < mddev->raid_disks; mirror++)
if ( !(p=conf->mirrors+mirror)->rdev) {
@ -1684,9 +1707,10 @@ static int run(mddev_t *mddev)
init_waitqueue_head(&conf->wait_idle);
init_waitqueue_head(&conf->wait_resume);
if (!conf->working_disks) {
printk(KERN_ERR "raid10: no operational mirrors for %s\n",
mdname(mddev));
/* need to check that every block has at least one working mirror */
if (!enough(conf)) {
printk(KERN_ERR "raid10: not enough operational mirrors for %s\n",
mdname(mddev));
goto out_free_conf;
}