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md faulty: use disk_stack_limits()

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in:
fe86cdce block: do not artificially constrain max_sectors for stacking drivers

max_sectors defaults to UINT_MAX.  md faulty wasn't using
disk_stack_limits(), so inherited this large value as well.
This triggered a bug in XFS when stressed over md_faulty, when
a very large bio_alloc() failed.

That was on an older kernel, and I can't reproduce exactly the
same thing upstream, but I think the fix is appropriate in any
case.

Thanks to Mike Snitzer for pointing out the problem.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
Eric Sandeen 2012-10-22 10:44:55 +11:00 • committed by NeilBrown
parent ae9d2b8ac0
commit 0be1fecd7e
1 changed files with 4 additions and 1 deletions

5
drivers/md/faulty.c
View file

@ -315,8 +315,11 @@ static int run(struct mddev *mddev)
}
conf->nfaults = 0;
rdev_for_each(rdev, mddev)
rdev_for_each(rdev, mddev) {
conf->rdev = rdev;
disk_stack_limits(mddev->gendisk, rdev->bdev,
rdev->data_offset << 9);
}
md_set_array_sectors(mddev, faulty_size(mddev, 0, 0));
mddev->private = conf;