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md: Tidy up rdev_size_store a bit:

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- used strict_strtoull in place of simple_strtoull
 - use my_mddev in place of rdev->mddev (they have the same value)
and more significantly,
 - don't adjust mddev->size to fit, rather reject changes which make
   rdev->size smaller than mddev->size

Adjusting mddev->size is a hangover from bind_rdev_to_array which
does a similar thing.  But it really is a better design to insist that
mddev->size is set as required, then the rdev->sizes are set to allow
for that.  The previous way invites confusion.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
Neil Brown 2008-07-12 10:37:50 +10:00 committed by NeilBrown
parent 7e93a89251
commit d7027458d6
2 changed files with 9 additions and 10 deletions
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2
Documentation/md.txt
View file

@ -347,7 +347,7 @@ Each directory contains:
for storage of data. This will normally be the same as the
component_size. This can be written while assembling an
array. If a value less than the current component_size is
written, component_size will be reduced to this value.
written, it will be rejected.
An active md device will also contain and entry for each active device

17
drivers/md/md.c
View file

@ -2101,16 +2101,17 @@ static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
static ssize_t
rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
{
char *e;
unsigned long long size = simple_strtoull(buf, &e, 10);
unsigned long long size;
unsigned long long oldsize = rdev->size;
mddev_t *my_mddev = rdev->mddev;
if (e==buf || (*e && *e != '\n'))
if (strict_strtoull(buf, 10, &size) < 0)
return -EINVAL;
if (size < my_mddev->size)
return -EINVAL;
if (my_mddev->pers && rdev->raid_disk >= 0) {
if (rdev->mddev->persistent) {
size = super_types[rdev->mddev->major_version].
if (my_mddev->persistent) {
size = super_types[my_mddev->major_version].
rdev_size_change(rdev, size);
if (!size)
return -EBUSY;
@ -2118,12 +2119,12 @@ rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
size = (rdev->bdev->bd_inode->i_size >> 10);
size -= rdev->data_offset/2;
}
if (size < rdev->mddev->size)
if (size < my_mddev->size)
return -EINVAL; /* component must fit device */
}
rdev->size = size;
if (size > oldsize && rdev->mddev->external) {
if (size > oldsize && my_mddev->external) {
/* need to check that all other rdevs with the same ->bdev
* do not overlap. We need to unlock the mddev to avoid
* a deadlock. We have already changed rdev->size, and if
@ -2165,8 +2166,6 @@ rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
return -EBUSY;
}
}
if (size < my_mddev->size || my_mddev->size == 0)
my_mddev->size = size;
return len;
}