// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2011-2014, Intel Corporation.
* Copyright (c) 2017-2021 Christoph Hellwig.
*/
#include <linux/blk-integrity.h>
#include <linux/ptrace.h> /* for force_successful_syscall_return */
#include <linux/nvme_ioctl.h>
#include <linux/io_uring/cmd.h>
#include "nvme.h"
enum {
NVME_IOCTL_VEC = (1 << 0),
NVME_IOCTL_PARTITION = (1 << 1),
};
static bool nvme_cmd_allowed(struct nvme_ns *ns, struct nvme_command *c,
unsigned int flags, bool open_for_write)
{
u32 effects;
/*
* Do not allow unprivileged passthrough on partitions, as that allows an
* escape from the containment of the partition.
*/
if (flags & NVME_IOCTL_PARTITION)
goto admin;
/*
* Do not allow unprivileged processes to send vendor specific or fabrics
* commands as we can't be sure about their effects.
*/
if (c->common.opcode >= nvme_cmd_vendor_start ||
c->common.opcode == nvme_fabrics_command)
goto admin;
/*
* Do not allow unprivileged passthrough of admin commands except
* for a subset of identify commands that contain information required
* to form proper I/O commands in userspace and do not expose any
* potentially sensitive information.
*/
if (!ns) {
if (c->common.opcode == nvme_admin_identify) {
switch (c->identify.cns) {
case NVME_ID_CNS_NS:
case NVME_ID_CNS_CS_NS:
case NVME_ID_CNS_NS_CS_INDEP:
case NVME_ID_CNS_CS_CTRL:
case NVME_ID_CNS_CTRL:
return true;
}
}
goto admin;
}
/*
* Check if the controller provides a Commands Supported and Effects log
* and marks this command as supported. If not reject unprivileged
* passthrough.
*/
effects = nvme_command_effects(ns->ctrl, ns, c->common.opcode);
if (!(effects & NVME_CMD_EFFECTS_CSUPP))
goto admin;
/*
* Don't allow passthrough for command that have intrusive (or unknown)
* effects.
*/
if (effects & ~(NVME_CMD_EFFECTS_CSUPP | NVME_CMD_EFFECTS_LBCC |
NVME_CMD_EFFECTS_UUID_SEL |
NVME_CMD_EFFECTS_SCOPE_MASK))
goto admin;
/*
* Only allow I/O commands that transfer data to the controller or that
* change the logical block contents if the file descriptor is open for
* writing.
*/
if ((nvme_is_write(c) || (effects & NVME_CMD_EFFECTS_LBCC)) &&
!open_for_write)
goto admin;
return true;
admin:
return capable(CAP_SYS_ADMIN);
}
/*
* Convert integer values from ioctl structures to user pointers, silently
* ignoring the upper bits in the compat case to match behaviour of 32-bit
* kernels.
*/
static void __user *nvme_to_user_ptr(uintptr_t ptrval)
{
if (in_compat_syscall())
ptrval = (compat_uptr_t)ptrval;
return (void __user *)ptrval;
}
static struct request *nvme_alloc_user_request(struct request_queue *q,
struct nvme_command *cmd, blk_opf_t rq_flags,
blk_mq_req_flags_t blk_flags)
{
struct request *req;
req = blk_mq_alloc_request(q, nvme_req_op(cmd) | rq_flags, blk_flags);
if (IS_ERR(req))
return req;
nvme_init_request(req, cmd);
nvme_req(req)->flags |= NVME_REQ_USERCMD;
return req;
}
static int nvme_map_user_request(struct request *req, u64 ubuffer,
unsigned bufflen, void __user *meta_buffer, unsigned meta_len,
u32 meta_seed, struct io_uring_cmd *ioucmd, unsigned int flags)
{
struct request_queue *q = req->q;
struct nvme_ns *ns = q->queuedata;
struct block_device *bdev = ns ? ns->disk->part0 : NULL;
bool supports_metadata = bdev && blk_get_integrity(bdev->bd_disk);
bool has_metadata = meta_buffer && meta_len;
struct bio *bio = NULL;
int ret;
if (has_metadata && !supports_metadata)
return -EINVAL;
if (ioucmd && (ioucmd->flags & IORING_URING_CMD_FIXED)) {
struct iov_iter iter;
/* fixedbufs is only for non-vectored io */
if (WARN_ON_ONCE(flags & NVME_IOCTL_VEC))
return -EINVAL;
ret = io_uring_cmd_import_fixed(ubuffer, bufflen,
rq_data_dir(req), &iter, ioucmd);
if (ret < 0)
goto out;
ret = blk_rq_map_user_iov(q, req, NULL, &iter, GFP_KERNEL);
} else {
ret = blk_rq_map_user_io(req, NULL, nvme_to_user_ptr(ubuffer),
bufflen, GFP_KERNEL, flags & NVME_IOCTL_VEC, 0,
0, rq_data_dir(req));
}
if (ret)
goto out;
bio = req->bio;
if (bdev)
bio_set_dev(bio, bdev);
if (has_metadata) {
ret = blk_rq_integrity_map_user(req, meta_buffer, meta_len,
meta_seed);
if (ret)
goto out_unmap;
}
return ret;
out_unmap:
if (bio)
blk_rq_unmap_user(bio);
out:
blk_mq_free_request(req);
return ret;
}
static int nvme_submit_user_cmd(struct request_queue *q,
struct nvme_command *cmd, u64 ubuffer, unsigned bufflen,
void __user *meta_buffer, unsigned meta_len, u32 meta_seed,
u64 *result, unsigned timeout, unsigned int flags)
{
struct nvme_ns *ns = q->queuedata;
struct nvme_ctrl *ctrl;
struct request *req;
struct bio *bio;
u32 effects;
int ret;
req = nvme_alloc_user_request(q, cmd, 0, 0);
if (IS_ERR(req))
return PTR_ERR(req);
req->timeout = timeout;
if (ubuffer && bufflen) {
ret = nvme_map_user_request(req, ubuffer, bufflen, meta_buffer,
meta_len, meta_seed, NULL, flags);
if (ret)
return ret;
}
bio = req->bio;
ctrl = nvme_req(req)->ctrl;
effects = nvme_passthru_start(ctrl, ns, cmd->common.opcode);
ret = nvme_execute_rq(req, false);
if (result)
*result = le64_to_cpu(nvme_req(req)->result.u64);
if (bio)
blk_rq_unmap_user(bio);
blk_mq_free_request(req);
if (effects)
nvme_passthru_end(ctrl, ns, effects, cmd, ret);
return ret;
}
static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio)
{
struct nvme_user_io io;
struct nvme_command c;
unsigned length, meta_len;
void __user *metadata;
if (copy_from_user(&io, uio, sizeof(io)))
return -EFAULT;
if (io.flags)
return -EINVAL;
switch (io.opcode) {
case nvme_cmd_write:
case nvme_cmd_read:
case nvme_cmd_compare:
break;
default:
return -EINVAL;
}
length = (io.nblocks + 1) << ns->head->lba_shift;
if ((io.control & NVME_RW_PRINFO_PRACT) &&
(ns->head->ms == ns->head->pi_size)) {
/*
* Protection information is stripped/inserted by the
* controller.
*/
if (nvme_to_user_ptr(io.metadata))
return -EINVAL;
meta_len = 0;
metadata = NULL;
} else {
meta_len = (io.nblocks + 1) * ns->head->ms;
metadata = nvme_to_user_ptr(io.metadata);
}
if (ns->head->features & NVME_NS_EXT_LBAS) {
length += meta_len;
meta_len = 0;
} else if (meta_len) {
if ((io.metadata & 3) || !io.metadata)
return -EINVAL;
}
memset(&c, 0, sizeof(c));
c.rw.opcode = io.opcode;
c.rw.flags = io.flags;
c.rw.nsid = cpu_to_le32(ns->head->ns_id);
c.rw.slba = cpu_to_le64(io.slba);
c.rw.length = cpu_to_le16(io.nblocks);
c.rw.control = cpu_to_le16(io.control);
c.rw.dsmgmt = cpu_to_le32(io.dsmgmt);
c.rw.reftag = cpu_to_le32(io.reftag);
c.rw.lbat = cpu_to_le16(io.apptag);
c.rw.lbatm = cpu_to_le16(io.appmask);
return nvme_submit_user_cmd(ns->queue, &c, io.addr, length, metadata,
meta_len, lower_32_bits(io.slba), NULL, 0, 0);
}
static bool nvme_validate_passthru_nsid(struct nvme_ctrl *ctrl,
struct nvme_ns *ns, __u32 nsid)
{
if (ns && nsid != ns->head->ns_id) {
dev_err(ctrl->device,
"%s: nsid (%u) in cmd does not match nsid (%u)"
"of namespace\n",
current->comm, nsid, ns->head->ns_id);
return false;
}
return true;
}
static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
struct nvme_passthru_cmd __user *ucmd, unsigned int flags,
bool open_for_write)
{
struct nvme_passthru_cmd cmd;
struct nvme_command c;
unsigned timeout = 0;
u64 result;
int status;
if (copy_from_user(&cmd, ucmd, sizeof(cmd)))
return -EFAULT;
if (cmd.flags)
return -EINVAL;
if (!nvme_validate_passthru_nsid(ctrl, ns, cmd.nsid))
return -EINVAL;
memset(&c, 0, sizeof(c));
c.common.opcode = cmd.opcode;
c.common.flags = cmd.flags;
c.common.nsid = cpu_to_le32(cmd.nsid);
c.common.cdw2[0] = cpu_to_le32(cmd.cdw2);
c.common.cdw2[1] = cpu_to_le32(cmd.cdw3);
c.common.cdw10 = cpu_to_le32(cmd.cdw10);
c.common.cdw11 = cpu_to_le32(cmd.cdw11);
c.common.cdw12 = cpu_to_le32(cmd.cdw12);
c.common.cdw13 = cpu_to_le32(cmd.cdw13);
c.common.cdw14 = cpu_to_le32(cmd.cdw14);
c.common.cdw15 = cpu_to_le32(cmd.cdw15);
if (!nvme_cmd_allowed(ns, &c, 0, open_for_write))
return -EACCES;
if (cmd.timeout_ms)
timeout = msecs_to_jiffies(cmd.timeout_ms);
status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c,
cmd.addr, cmd.data_len, nvme_to_user_ptr(cmd.metadata),
cmd.metadata_len, 0, &result, timeout, 0);
if (status >= 0) {
if (put_user(result, &ucmd->result))
return -EFAULT;
}
return status;
}
static int nvme_user_cmd64(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
struct nvme_passthru_cmd64 __user *ucmd, unsigned int flags,
bool open_for_write)
{
struct nvme_passthru_cmd64 cmd;
struct nvme_command c;
unsigned timeout = 0;
int status;
if (copy_from_user(&cmd, ucmd, sizeof(cmd)))
return -EFAULT;
if (cmd.flags)
return -EINVAL;
if (!nvme_validate_passthru_nsid(ctrl, ns, cmd.nsid))
return -EINVAL;
memset(&c, 0, sizeof(c));
c.common.opcode = cmd.opcode;
c.common.flags = cmd.flags;
c.common.nsid = cpu_to_le32(cmd.nsid);
c.common.cdw2[0] = cpu_to_le32(cmd.cdw2);
c.common.cdw2[1] = cpu_to_le32(cmd.cdw3);
c.common.cdw10 = cpu_to_le32(cmd.cdw10);
c.common.cdw11 = cpu_to_le32(cmd.cdw11);
c.common.cdw12 = cpu_to_le32(cmd.cdw12);
c.common.cdw13 = cpu_to_le32(cmd.cdw13);
c.common.cdw14 = cpu_to_le32(cmd.cdw14);
c.common.cdw15 = cpu_to_le32(cmd.cdw15);
if (!nvme_cmd_allowed(ns, &c, flags, open_for_write))
return -EACCES;
if (cmd.timeout_ms)
timeout = msecs_to_jiffies(cmd.timeout_ms);
status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c,
cmd.addr, cmd.data_len, nvme_to_user_ptr(cmd.metadata),
cmd.metadata_len, 0, &cmd.result, timeout, flags);
if (status >= 0) {
if (put_user(cmd.result, &ucmd->result))
return -EFAULT;
}
return status;
}
struct nvme_uring_data {
__u64 metadata;
__u64 addr;
__u32 data_len;
__u32 metadata_len;
__u32 timeout_ms;
};
/*
* This overlays struct io_uring_cmd pdu.
* Expect build errors if this grows larger than that.
*/
struct nvme_uring_cmd_pdu {
struct request *req;
struct bio *bio;
u64 result;
int status;
};
static inline struct nvme_uring_cmd_pdu *nvme_uring_cmd_pdu(
struct io_uring_cmd *ioucmd)
{
return (struct nvme_uring_cmd_pdu *)&ioucmd->pdu;
}
static void nvme_uring_task_cb(struct io_uring_cmd *ioucmd,
unsigned issue_flags)
{
struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd);
if (pdu->bio)
blk_rq_unmap_user(pdu->bio);
io_uring_cmd_done(ioucmd, pdu->status, pdu->result, issue_flags);
}
static enum rq_end_io_ret nvme_uring_cmd_end_io(struct request *req,
blk_status_t err)
{
struct io_uring_cmd *ioucmd = req->end_io_data;
struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd);
if (nvme_req(req)->flags & NVME_REQ_CANCELLED)
pdu->status = -EINTR;
else
pdu->status = nvme_req(req)->status;
pdu->result = le64_to_cpu(nvme_req(req)->result.u64);
/*
* For iopoll, complete it directly. Note that using the uring_cmd
* helper for this is safe only because we check blk_rq_is_poll().
* As that returns false if we're NOT on a polled queue, then it's
* safe to use the polled completion helper.
*
* Otherwise, move the completion to task work.
*/
if (blk_rq_is_poll(req)) {
if (pdu->bio)
blk_rq_unmap_user(pdu->bio);
io_uring_cmd_iopoll_done(ioucmd, pdu->result, pdu->status);
} else {
io_uring_cmd_do_in_task_lazy(ioucmd, nvme_uring_task_cb);
}
return RQ_END_IO_FREE;
}
static int nvme_uring_cmd_io(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
struct io_uring_cmd *ioucmd, unsigned int issue_flags, bool vec)
{
struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd);
const struct nvme_uring_cmd *cmd = io_uring_sqe_cmd(ioucmd->sqe);
struct request_queue *q = ns ? ns->queue : ctrl->admin_q;
struct nvme_uring_data d;
struct nvme_command c;
struct request *req;
blk_opf_t rq_flags = REQ_ALLOC_CACHE;
blk_mq_req_flags_t blk_flags = 0;
int ret;
c.common.opcode = READ_ONCE(cmd->opcode);
c.common.flags = READ_ONCE(cmd->flags);
if (c.common.flags)
return -EINVAL;
c.common.command_id = 0;
c.common.nsid = cpu_to_le32(cmd->nsid);
if (!nvme_validate_passthru_nsid(ctrl, ns, le32_to_cpu(c.common.nsid)))
return -EINVAL;
c.common.cdw2[0] = cpu_to_le32(READ_ONCE(cmd->cdw2));
c.common.cdw2[1] = cpu_to_le32(READ_ONCE(cmd->cdw3));
c.common.metadata = 0;
c.common.dptr.prp1 = c.common.dptr.prp2 = 0;
c.common.cdw10 = cpu_to_le32(READ_ONCE(cmd->cdw10));
c.common.cdw11 = cpu_to_le32(READ_ONCE(cmd->cdw11));
c.common.cdw12 = cpu_to_le32(READ_ONCE(cmd->cdw12));
c.common.cdw13 = cpu_to_le32(READ_ONCE(cmd->cdw13));
c.common.cdw14 = cpu_to_le32(READ_ONCE(cmd->cdw14));
c.common.cdw15 = cpu_to_le32(READ_ONCE(cmd->cdw15));
if (!nvme_cmd_allowed(ns, &c, 0, ioucmd->file->f_mode & FMODE_WRITE))
return -EACCES;
d.metadata = READ_ONCE(cmd->metadata);
d.addr = READ_ONCE(cmd->addr);
d.data_len = READ_ONCE(cmd->data_len);
d.metadata_len = READ_ONCE(cmd->metadata_len);
d.timeout_ms = READ_ONCE(cmd->timeout_ms);
if (issue_flags & IO_URING_F_NONBLOCK) {
rq_flags |= REQ_NOWAIT;
blk_flags = BLK_MQ_REQ_NOWAIT;
}
if (issue_flags & IO_URING_F_IOPOLL)
rq_flags |= REQ_POLLED;
req = nvme_alloc_user_request(q, &c, rq_flags, blk_flags);
if (IS_ERR(req))
return PTR_ERR(req);
req->timeout = d.timeout_ms ? msecs_to_jiffies(d.timeout_ms) : 0;
if (d.addr && d.data_len) {
ret = nvme_map_user_request(req, d.addr,
d.data_len, nvme_to_user_ptr(d.metadata),
d.metadata_len, 0, ioucmd, vec);
if (ret)
return ret;
}
/* to free bio on completion, as req->bio will be null at that time */
pdu->bio = req->bio;
pdu->req = req;
req->end_io_data = ioucmd;
req->end_io = nvme_uring_cmd_end_io;
blk_execute_rq_nowait(req, false);
return -EIOCBQUEUED;
}
static bool is_ctrl_ioctl(unsigned int cmd)
{
if (cmd == NVME_IOCTL_ADMIN_CMD || cmd == NVME_IOCTL_ADMIN64_CMD)
return true;
if (is_sed_ioctl(cmd))
return true;
return false;
}
static int nvme_ctrl_ioctl(struct nvme_ctrl *ctrl, unsigned int cmd,
void __user *argp, bool open_for_write)
{
switch (cmd) {
case NVME_IOCTL_ADMIN_CMD:
return nvme_user_cmd(ctrl, NULL, argp, 0, open_for_write);
case NVME_IOCTL_ADMIN64_CMD:
return nvme_user_cmd64(ctrl, NULL, argp, 0, open_for_write);
default:
return sed_ioctl(ctrl->opal_dev, cmd, argp);
}
}
#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, unsigned int flags, bool open_for_write)
{
switch (cmd) {
case NVME_IOCTL_ID:
force_successful_syscall_return();
return ns->head->ns_id;
case NVME_IOCTL_IO_CMD:
return nvme_user_cmd(ns->ctrl, ns, argp, flags, open_for_write);
/*
* 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_VEC:
flags |= NVME_IOCTL_VEC;
fallthrough;
case NVME_IOCTL_IO64_CMD:
return nvme_user_cmd64(ns->ctrl, ns, argp, flags,
open_for_write);
default:
return -ENOTTY;
}
}
int nvme_ioctl(struct block_device *bdev, blk_mode_t mode,
unsigned int cmd, unsigned long arg)
{
struct nvme_ns *ns = bdev->bd_disk->private_data;
bool open_for_write = mode & BLK_OPEN_WRITE;
void __user *argp = (void __user *)arg;
unsigned int flags = 0;
if (bdev_is_partition(bdev))
flags |= NVME_IOCTL_PARTITION;
if (is_ctrl_ioctl(cmd))
return nvme_ctrl_ioctl(ns->ctrl, cmd, argp, open_for_write);
return nvme_ns_ioctl(ns, cmd, argp, flags, open_for_write);
}
long nvme_ns_chr_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
struct nvme_ns *ns =
container_of(file_inode(file)->i_cdev, struct nvme_ns, cdev);
bool open_for_write = file->f_mode & FMODE_WRITE;
void __user *argp = (void __user *)arg;
if (is_ctrl_ioctl(cmd))
return nvme_ctrl_ioctl(ns->ctrl, cmd, argp, open_for_write);
return nvme_ns_ioctl(ns, cmd, argp, 0, open_for_write);
}
static int nvme_uring_cmd_checks(unsigned int issue_flags)
{
/* NVMe passthrough requires big SQE/CQE support */
if ((issue_flags & (IO_URING_F_SQE128|IO_URING_F_CQE32)) !=
(IO_URING_F_SQE128|IO_URING_F_CQE32))
return -EOPNOTSUPP;
return 0;
}
static int nvme_ns_uring_cmd(struct nvme_ns *ns, struct io_uring_cmd *ioucmd,
unsigned int issue_flags)
{
struct nvme_ctrl *ctrl = ns->ctrl;
int ret;
BUILD_BUG_ON(sizeof(struct nvme_uring_cmd_pdu) > sizeof(ioucmd->pdu));
ret = nvme_uring_cmd_checks(issue_flags);
if (ret)
return ret;
switch (ioucmd->cmd_op) {
case NVME_URING_CMD_IO:
ret = nvme_uring_cmd_io(ctrl, ns, ioucmd, issue_flags, false);
break;
case NVME_URING_CMD_IO_VEC:
ret = nvme_uring_cmd_io(ctrl, ns, ioucmd, issue_flags, true);
break;
default:
ret = -ENOTTY;
}
return ret;
}
int nvme_ns_chr_uring_cmd(struct io_uring_cmd *ioucmd, unsigned int issue_flags)
{
struct nvme_ns *ns = container_of(file_inode(ioucmd->file)->i_cdev,
struct nvme_ns, cdev);
return nvme_ns_uring_cmd(ns, ioucmd, issue_flags);
}
int nvme_ns_chr_uring_cmd_iopoll(struct io_uring_cmd *ioucmd,
struct io_comp_batch *iob,
unsigned int poll_flags)
{
struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd);
struct request *req = pdu->req;
if (req && blk_rq_is_poll(req))
return blk_rq_poll(req, iob, poll_flags);
return 0;
}
#ifdef CONFIG_NVME_MULTIPATH
static int nvme_ns_head_ctrl_ioctl(struct nvme_ns *ns, unsigned int cmd,
void __user *argp, struct nvme_ns_head *head, int srcu_idx,
bool open_for_write)
__releases(&head->srcu)
{
struct nvme_ctrl *ctrl = ns->ctrl;
int ret;
nvme_get_ctrl(ns->ctrl);
srcu_read_unlock(&head->srcu, srcu_idx);
ret = nvme_ctrl_ioctl(ns->ctrl, cmd, argp, open_for_write);
nvme_put_ctrl(ctrl);
return ret;
}
int nvme_ns_head_ioctl(struct block_device *bdev, blk_mode_t mode,
unsigned int cmd, unsigned long arg)
{
struct nvme_ns_head *head = bdev->bd_disk->private_data;
bool open_for_write = mode & BLK_OPEN_WRITE;
void __user *argp = (void __user *)arg;
struct nvme_ns *ns;
int srcu_idx, ret = -EWOULDBLOCK;
unsigned int flags = 0;
if (bdev_is_partition(bdev))
flags |= NVME_IOCTL_PARTITION;
srcu_idx = srcu_read_lock(&head->srcu);
ns = nvme_find_path(head);
if (!ns)
goto out_unlock;
/*
* Handle ioctls that apply to the controller instead of the namespace
* seperately and drop the ns SRCU reference early. This avoids a
* deadlock when deleting namespaces using the passthrough interface.
*/
if (is_ctrl_ioctl(cmd))
return nvme_ns_head_ctrl_ioctl(ns, cmd, argp, head, srcu_idx,
open_for_write);
ret = nvme_ns_ioctl(ns, cmd, argp, flags, open_for_write);
out_unlock:
srcu_read_unlock(&head->srcu, srcu_idx);
return ret;
}
long nvme_ns_head_chr_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
bool open_for_write = file->f_mode & FMODE_WRITE;
struct cdev *cdev = file_inode(file)->i_cdev;
struct nvme_ns_head *head =
container_of(cdev, struct nvme_ns_head, cdev);
void __user *argp = (void __user *)arg;
struct nvme_ns *ns;
int srcu_idx, ret = -EWOULDBLOCK;
srcu_idx = srcu_read_lock(&head->srcu);
ns = nvme_find_path(head);
if (!ns)
goto out_unlock;
if (is_ctrl_ioctl(cmd))
return nvme_ns_head_ctrl_ioctl(ns, cmd, argp, head, srcu_idx,
open_for_write);
ret = nvme_ns_ioctl(ns, cmd, argp, 0, open_for_write);
out_unlock:
srcu_read_unlock(&head->srcu, srcu_idx);
return ret;
}
int nvme_ns_head_chr_uring_cmd(struct io_uring_cmd *ioucmd,
unsigned int issue_flags)
{
struct cdev *cdev = file_inode(ioucmd->file)->i_cdev;
struct nvme_ns_head *head = container_of(cdev, struct nvme_ns_head, cdev);
int srcu_idx = srcu_read_lock(&head->srcu);
struct nvme_ns *ns = nvme_find_path(head);
int ret = -EINVAL;
if (ns)
ret = nvme_ns_uring_cmd(ns, ioucmd, issue_flags);
srcu_read_unlock(&head->srcu, srcu_idx);
return ret;
}
#endif /* CONFIG_NVME_MULTIPATH */
int nvme_dev_uring_cmd(struct io_uring_cmd *ioucmd, unsigned int issue_flags)
{
struct nvme_ctrl *ctrl = ioucmd->file->private_data;
int ret;
/* IOPOLL not supported yet */
if (issue_flags & IO_URING_F_IOPOLL)
return -EOPNOTSUPP;
ret = nvme_uring_cmd_checks(issue_flags);
if (ret)
return ret;
switch (ioucmd->cmd_op) {
case NVME_URING_CMD_ADMIN:
ret = nvme_uring_cmd_io(ctrl, NULL, ioucmd, issue_flags, false);
break;
case NVME_URING_CMD_ADMIN_VEC:
ret = nvme_uring_cmd_io(ctrl, NULL, ioucmd, issue_flags, true);
break;
default:
ret = -ENOTTY;
}
return ret;
}
static int nvme_dev_user_cmd(struct nvme_ctrl *ctrl, void __user *argp,
bool open_for_write)
{
struct nvme_ns *ns;
int ret, srcu_idx;
srcu_idx = srcu_read_lock(&ctrl->srcu);
if (list_empty(&ctrl->namespaces)) {
ret = -ENOTTY;
goto out_unlock;
}
ns = list_first_or_null_rcu(&ctrl->namespaces, struct nvme_ns, list);
if (ns != list_last_entry(&ctrl->namespaces, struct nvme_ns, list)) {
dev_warn(ctrl->device,
"NVME_IOCTL_IO_CMD not supported when multiple namespaces present!\n");
ret = -EINVAL;
goto out_unlock;
}
dev_warn(ctrl->device,
"using deprecated NVME_IOCTL_IO_CMD ioctl on the char device!\n");
if (!nvme_get_ns(ns)) {
ret = -ENXIO;
goto out_unlock;
}
srcu_read_unlock(&ctrl->srcu, srcu_idx);
ret = nvme_user_cmd(ctrl, ns, argp, 0, open_for_write);
nvme_put_ns(ns);
return ret;
out_unlock:
srcu_read_unlock(&ctrl->srcu, srcu_idx);
return ret;
}
long nvme_dev_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
bool open_for_write = file->f_mode & FMODE_WRITE;
struct nvme_ctrl *ctrl = file->private_data;
void __user *argp = (void __user *)arg;
switch (cmd) {
case NVME_IOCTL_ADMIN_CMD:
return nvme_user_cmd(ctrl, NULL, argp, 0, open_for_write);
case NVME_IOCTL_ADMIN64_CMD:
return nvme_user_cmd64(ctrl, NULL, argp, 0, open_for_write);
case NVME_IOCTL_IO_CMD:
return nvme_dev_user_cmd(ctrl, argp, open_for_write);
case NVME_IOCTL_RESET:
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
dev_warn(ctrl->device, "resetting controller\n");
return nvme_reset_ctrl_sync(ctrl);
case NVME_IOCTL_SUBSYS_RESET:
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
return nvme_reset_subsystem(ctrl);
case NVME_IOCTL_RESCAN:
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
nvme_queue_scan(ctrl);
return 0;
default:
return -ENOTTY;
}
}
Codebase Browser
linux