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lightnvm: guarantee target unique name across devs.

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Until now, target unique naming is only guaranteed per device. This is
ok from a lightnvm perspective, but not from a sysfs one, since groups
will collide regardless of the underlying device.

Check that names are unique across all lightnvm-capable devices.

Signed-off-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Javier González 2018-01-05 14:16:05 +01:00 committed by Jens Axboe
parent e29c80e6dd
commit bd77b23b40
1 changed files with 27 additions and 6 deletions
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33
drivers/lightnvm/core.c
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@ -56,6 +56,30 @@ static struct nvm_target *nvm_find_target(struct nvm_dev *dev, const char *name)
return NULL;
}
static bool nvm_target_exists(const char *name)
{
struct nvm_dev *dev;
struct nvm_target *tgt;
bool ret = false;
down_write(&nvm_lock);
list_for_each_entry(dev, &nvm_devices, devices) {
mutex_lock(&dev->mlock);
list_for_each_entry(tgt, &dev->targets, list) {
if (!strcmp(name, tgt->disk->disk_name)) {
ret = true;
mutex_unlock(&dev->mlock);
goto out;
}
}
mutex_unlock(&dev->mlock);
}
out:
up_write(&nvm_lock);
return ret;
}
static int nvm_reserve_luns(struct nvm_dev *dev, int lun_begin, int lun_end)
{
int i;
@ -259,14 +283,11 @@ static int nvm_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create)
return -EINVAL;
}
mutex_lock(&dev->mlock);
t = nvm_find_target(dev, create->tgtname);
if (t) {
pr_err("nvm: target name already exists.\n");
mutex_unlock(&dev->mlock);
if (nvm_target_exists(create->tgtname)) {
pr_err("nvm: target name already exists (%s)\n",
create->tgtname);
return -EINVAL;
}
mutex_unlock(&dev->mlock);
ret = nvm_reserve_luns(dev, s->lun_begin, s->lun_end);
if (ret)