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drbd: Enforce limits of disk_conf members; centralized these checks 

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Philipp Reisner 2011-05-04 10:06:52 +02:00
parent 9958c857c7
commit d589a21e5d
1 changed files with 14 additions and 10 deletions
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24
drivers/block/drbd/drbd_nl.c
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@ -937,9 +937,6 @@ static int drbd_check_al_size(struct drbd_conf *mdev, struct disk_conf *dc)
unsigned int in_use;
int i;
if (!expect(dc->al_extents >= DRBD_AL_EXTENTS_MIN))
dc->al_extents = DRBD_AL_EXTENTS_MIN;
if (mdev->act_log &&
mdev->act_log->nr_elements == dc->al_extents)
return 0;
@ -1102,6 +1099,17 @@ static bool should_set_defaults(struct genl_info *info)
return 0 != (flags & DRBD_GENL_F_SET_DEFAULTS);
}
static void enforce_disk_conf_limits(struct disk_conf *dc)
{
if (dc->al_extents < DRBD_AL_EXTENTS_MIN)
dc->al_extents = DRBD_AL_EXTENTS_MIN;
if (dc->al_extents > DRBD_AL_EXTENTS_MAX)
dc->al_extents = DRBD_AL_EXTENTS_MAX;
if (dc->c_plan_ahead > DRBD_C_PLAN_AHEAD_MAX)
dc->c_plan_ahead = DRBD_C_PLAN_AHEAD_MAX;
}
int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info)
{
enum drbd_ret_code retcode;
@ -1146,11 +1154,7 @@ int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info)
if (!expect(new_disk_conf->resync_rate >= 1))
new_disk_conf->resync_rate = 1;
/* clip to allowed range */
if (!expect(new_disk_conf->al_extents >= DRBD_AL_EXTENTS_MIN))
new_disk_conf->al_extents = DRBD_AL_EXTENTS_MIN;
if (!expect(new_disk_conf->al_extents <= DRBD_AL_EXTENTS_MAX))
new_disk_conf->al_extents = DRBD_AL_EXTENTS_MAX;
enforce_disk_conf_limits(new_disk_conf);
fifo_size = (new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ;
if (fifo_size != mdev->rs_plan_s->size) {
@ -1273,6 +1277,8 @@ int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
goto fail;
}
enforce_disk_conf_limits(new_disk_conf);
new_plan = fifo_alloc((new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ);
if (!new_plan) {
retcode = ERR_NOMEM;
@ -1450,8 +1456,6 @@ int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
else
clear_bit(MD_NO_FUA, &mdev->flags);
/* FIXME Missing stuff: clip al range */
/* Point of no return reached.
* Devices and memory are no longer released by error cleanup below.
* now mdev takes over responsibility, and the state engine should