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NVMe: Namespace IDs are unsigned

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The 'Number of Namespaces' read from the device was being treated as
signed, which would cause us to not scan any namespaces for a device
with more than 2 billion namespaces.  That led to noticing that the
namespace ID was also being treated as signed, which could lead to the
result from NVME_IOCTL_ID being treated as an error code.

Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
This commit is contained in:
Matthew Wilcox 2013-07-08 17:26:25 -04:00
parent 685585c25e
commit c3bfe7176c
2 changed files with 6 additions and 3 deletions
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7
drivers/block/nvme-core.c
View file

@ -36,6 +36,7 @@
#include <linux/moduleparam.h>
#include <linux/pci.h>
#include <linux/poison.h>
#include <linux/ptrace.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/types.h>
@ -1486,6 +1487,7 @@ static int nvme_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
switch (cmd) {
case NVME_IOCTL_ID:
force_successful_syscall_return();
return ns->ns_id;
case NVME_IOCTL_ADMIN_CMD:
return nvme_user_admin_cmd(ns->dev, (void __user *)arg);
@ -1588,7 +1590,7 @@ static void nvme_config_discard(struct nvme_ns *ns)
queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, ns->queue);
}
static struct nvme_ns *nvme_alloc_ns(struct nvme_dev *dev, int nsid,
static struct nvme_ns *nvme_alloc_ns(struct nvme_dev *dev, unsigned nsid,
struct nvme_id_ns *id, struct nvme_lba_range_type *rt)
{
struct nvme_ns *ns;
@ -1768,7 +1770,8 @@ static void nvme_free_queues(struct nvme_dev *dev)
*/
static int nvme_dev_add(struct nvme_dev *dev)
{
int res, nn, i;
int res;
unsigned nn, i;
struct nvme_ns *ns;
struct nvme_id_ctrl *ctrl;
struct nvme_id_ns *id_ns;

2
include/linux/nvme.h
View file

@ -104,7 +104,7 @@ struct nvme_ns {
struct request_queue *queue;
struct gendisk *disk;
int ns_id;
unsigned ns_id;
int lba_shift;
int ms;
u64 mode_select_num_blocks;