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nvme: simplify the compat ioctl handling 

Don't bother defining a separate compat_ioctl handler, and just handle
the NVME_IOCTL_SUBMIT_IO32 case inline.  Also only defined it for those
ABIs (currently just i386 vs x86_64) that are affected.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Javier González <javier.gonz@samsung.com>
This commit is contained in:
Christoph Hellwig 2021-04-08 14:04:42 +02:00
parent a5d737f100
commit 89b3d6e605
1 changed files with 26 additions and 43 deletions
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69
drivers/nvme/host/core.c
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@ -1783,6 +1783,24 @@ static int nvme_handle_ctrl_ioctl(struct nvme_ns *ns, unsigned int cmd,
return ret;
}
#ifdef COMPAT_FOR_U64_ALIGNMENT
struct nvme_user_io32 {
__u8 opcode;
__u8 flags;
__u16 control;
__u16 nblocks;
__u16 rsvd;
__u64 metadata;
__u64 addr;
__u64 slba;
__u32 dsmgmt;
__u32 reftag;
__u16 apptag;
__u16 appmask;
} __attribute__((__packed__));
#define NVME_IOCTL_SUBMIT_IO32 _IOW('N', 0x42, struct nvme_user_io32)
#endif /* COMPAT_FOR_U64_ALIGNMENT */
static int nvme_ns_ioctl(struct nvme_ns *ns, unsigned int cmd,
void __user *argp)
{
@ -1792,6 +1810,14 @@ static int nvme_ns_ioctl(struct nvme_ns *ns, unsigned int cmd,
return ns->head->ns_id;
case NVME_IOCTL_IO_CMD:
return nvme_user_cmd(ns->ctrl, ns, argp);
/*
* struct nvme_user_io can have different padding on some 32-bit ABIs.
* Just accept the compat version as all fields that are used are the
* same size and at the same offset.
*/
#ifdef COMPAT_FOR_U64_ALIGNMENT
case NVME_IOCTL_SUBMIT_IO32:
#endif
case NVME_IOCTL_SUBMIT_IO:
return nvme_submit_io(ns, argp);
case NVME_IOCTL_IO64_CMD:
@ -1828,47 +1854,6 @@ static int nvme_ioctl(struct block_device *bdev, fmode_t mode,
return ret;
}
#ifdef CONFIG_COMPAT
struct nvme_user_io32 {
__u8 opcode;
__u8 flags;
__u16 control;
__u16 nblocks;
__u16 rsvd;
__u64 metadata;
__u64 addr;
__u64 slba;
__u32 dsmgmt;
__u32 reftag;
__u16 apptag;
__u16 appmask;
} __attribute__((__packed__));
#define NVME_IOCTL_SUBMIT_IO32 _IOW('N', 0x42, struct nvme_user_io32)
static int nvme_compat_ioctl(struct block_device *bdev, fmode_t mode,
unsigned int cmd, unsigned long arg)
{
/*
* Corresponds to the difference of NVME_IOCTL_SUBMIT_IO
* between 32 bit programs and 64 bit kernel.
* The cause is that the results of sizeof(struct nvme_user_io),
* which is used to define NVME_IOCTL_SUBMIT_IO,
* are not same between 32 bit compiler and 64 bit compiler.
* NVME_IOCTL_SUBMIT_IO32 is for 64 bit kernel handling
* NVME_IOCTL_SUBMIT_IO issued from 32 bit programs.
* Other IOCTL numbers are same between 32 bit and 64 bit.
* So there is nothing to do regarding to other IOCTL numbers.
*/
if (cmd == NVME_IOCTL_SUBMIT_IO32)
return nvme_ioctl(bdev, mode, NVME_IOCTL_SUBMIT_IO, arg);
return nvme_ioctl(bdev, mode, cmd, arg);
}
#else
#define nvme_compat_ioctl NULL
#endif /* CONFIG_COMPAT */
static int nvme_open(struct block_device *bdev, fmode_t mode)
{
struct nvme_ns *ns = bdev->bd_disk->private_data;
@ -2356,7 +2341,6 @@ EXPORT_SYMBOL_GPL(nvme_sec_submit);
static const struct block_device_operations nvme_bdev_ops = {
.owner = THIS_MODULE,
.ioctl = nvme_ioctl,
.compat_ioctl = nvme_compat_ioctl,
.open = nvme_open,
.release = nvme_release,
.getgeo = nvme_getgeo,
@ -2385,7 +2369,6 @@ const struct block_device_operations nvme_ns_head_ops = {
.open = nvme_ns_head_open,
.release = nvme_ns_head_release,
.ioctl = nvme_ioctl,
.compat_ioctl = nvme_compat_ioctl,
.getgeo = nvme_getgeo,
.report_zones = nvme_report_zones,
.pr_ops = &nvme_pr_ops,