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[PATCH] md: Fix a bug that recently crept into md/linear 

A recent patch that allowed linear arrays to be reconfigured on-line
allowed in a bug which results in divide by zero - not all
mddev->array_size were converted to conf->array_size.

This patch finished the conversion and fixed the bug.

The offending patch was commit 7c7546ccf6.

Thanks to Simon Kirby <sim@netnation.com> for the bug report.

Cc: Simon Kirby <sim@netnation.com>
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 2006-08-05 12:14:07 -07:00 committed by Linus Torvalds
parent af2bc7d222
commit f9abd1ace4
1 changed files with 3 additions and 3 deletions
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6
drivers/md/linear.c
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@ -162,7 +162,7 @@ static linear_conf_t *linear_conf(mddev_t *mddev, int raid_disks)
goto out;
}
min_spacing = mddev->array_size;
min_spacing = conf->array_size;
sector_div(min_spacing, PAGE_SIZE/sizeof(struct dev_info *));
/* min_spacing is the minimum spacing that will fit the hash
@ -171,7 +171,7 @@ static linear_conf_t *linear_conf(mddev_t *mddev, int raid_disks)
* that is larger than min_spacing as use the size of that as
* the actual spacing
*/
conf->hash_spacing = mddev->array_size;
conf->hash_spacing = conf->array_size;
for (i=0; i < cnt-1 ; i++) {
sector_t sz = 0;
int j;
@ -228,7 +228,7 @@ static linear_conf_t *linear_conf(mddev_t *mddev, int raid_disks)
curr_offset = 0;
i = 0;
for (curr_offset = 0;
curr_offset < mddev->array_size;
curr_offset < conf->array_size;
curr_offset += conf->hash_spacing) {
while (i < mddev->raid_disks-1 &&