diff options
Diffstat (limited to 'drivers/nvme/host/ioctl.c')
| -rw-r--r-- | drivers/nvme/host/ioctl.c | 871 |
1 files changed, 871 insertions, 0 deletions
diff --git a/drivers/nvme/host/ioctl.c b/drivers/nvme/host/ioctl.c new file mode 100644 index 000000000000..a9c097dacad6 --- /dev/null +++ b/drivers/nvme/host/ioctl.c @@ -0,0 +1,871 @@ +// 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, + struct iov_iter *iter, 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); + struct nvme_ctrl *ctrl = nvme_req(req)->ctrl; + bool has_metadata = meta_buffer && meta_len; + struct bio *bio = NULL; + int ret; + + if (!nvme_ctrl_sgl_supported(ctrl)) + dev_warn_once(ctrl->device, "using unchecked data buffer\n"); + if (has_metadata) { + if (!supports_metadata) + return -EINVAL; + + if (!nvme_ctrl_meta_sgl_supported(ctrl)) + dev_warn_once(ctrl->device, + "using unchecked metadata buffer\n"); + } + + if (iter) + 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) + return ret; + + if (has_metadata) { + ret = blk_rq_integrity_map_user(req, meta_buffer, meta_len); + if (ret) + goto out_unmap; + } + + return ret; + +out_unmap: + if (bio) + blk_rq_unmap_user(bio); + 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, + 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, NULL, flags); + if (ret) + goto out_free_req; + } + + 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; + +out_free_req: + blk_mq_free_request(req); + 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, 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, &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, &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 io_uring_cmd_to_pdu(ioucmd, struct nvme_uring_cmd_pdu); +} + +static void nvme_uring_task_cb(struct io_tw_req tw_req, io_tw_token_t tw) +{ + struct io_uring_cmd *ioucmd = io_uring_cmd_from_tw(tw_req); + struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd); + + if (pdu->bio) + blk_rq_unmap_user(pdu->bio); + io_uring_cmd_done32(ioucmd, pdu->status, pdu->result, + IO_URING_CMD_TASK_WORK_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; + if (!pdu->status) + pdu->status = blk_status_to_errno(err); + } + pdu->result = le64_to_cpu(nvme_req(req)->result.u64); + + /* + * IOPOLL could potentially complete this request directly, but + * if multiple rings are polling on the same queue, then it's possible + * for one ring to find completions for another ring. Punting the + * completion via task_work will always direct it to the right + * location, rather than potentially complete requests for ringA + * under iopoll invocations from ringB. + */ + 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 iov_iter iter; + struct iov_iter *map_iter = NULL; + struct request *req; + blk_opf_t rq_flags = 0; + 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 (d.data_len && (ioucmd->flags & IORING_URING_CMD_FIXED)) { + int ddir = nvme_is_write(&c) ? WRITE : READ; + + if (vec) + ret = io_uring_cmd_import_fixed_vec(ioucmd, + u64_to_user_ptr(d.addr), d.data_len, + ddir, &iter, issue_flags); + else + ret = io_uring_cmd_import_fixed(d.addr, d.data_len, + ddir, &iter, ioucmd, issue_flags); + if (ret < 0) + return ret; + + map_iter = &iter; + } + + 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.data_len) { + ret = nvme_map_user_request(req, d.addr, d.data_len, + nvme_to_user_ptr(d.metadata), d.metadata_len, + map_iter, vec ? NVME_IOCTL_VEC : 0); + if (ret) + goto out_free_req; + } + + /* 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; + +out_free_req: + blk_mq_free_request(req); + return ret; +} + +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; + + 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 + * separately 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; + } +} |