// SPDX-License-Identifier: GPL-2.0
#include <linux/capability.h>
#include <linux/compat.h>
#include <linux/blkdev.h>
#include <linux/export.h>
#include <linux/gfp.h>
#include <linux/blkpg.h>
#include <linux/hdreg.h>
#include <linux/backing-dev.h>
#include <linux/fs.h>
#include <linux/blktrace_api.h>
#include <linux/pr.h>
#include <linux/uaccess.h>
#include <linux/pagemap.h>
#include <linux/io_uring/cmd.h>
#include <uapi/linux/blkdev.h>
#include "blk.h"
static int blkpg_do_ioctl(struct block_device *bdev,
struct blkpg_partition __user *upart, int op)
{
struct gendisk *disk = bdev->bd_disk;
struct blkpg_partition p;
sector_t start, length, capacity, end;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (copy_from_user(&p, upart, sizeof(struct blkpg_partition)))
return -EFAULT;
if (bdev_is_partition(bdev))
return -EINVAL;
if (p.pno <= 0)
return -EINVAL;
if (op == BLKPG_DEL_PARTITION)
return bdev_del_partition(disk, p.pno);
if (p.start < 0 || p.length <= 0 || LLONG_MAX - p.length < p.start)
return -EINVAL;
/* Check that the partition is aligned to the block size */
if (!IS_ALIGNED(p.start | p.length, bdev_logical_block_size(bdev)))
return -EINVAL;
start = p.start >> SECTOR_SHIFT;
length = p.length >> SECTOR_SHIFT;
capacity = get_capacity(disk);
if (check_add_overflow(start, length, &end))
return -EINVAL;
if (start >= capacity || end > capacity)
return -EINVAL;
switch (op) {
case BLKPG_ADD_PARTITION:
return bdev_add_partition(disk, p.pno, start, length);
case BLKPG_RESIZE_PARTITION:
return bdev_resize_partition(disk, p.pno, start, length);
default:
return -EINVAL;
}
}
static int blkpg_ioctl(struct block_device *bdev,
struct blkpg_ioctl_arg __user *arg)
{
struct blkpg_partition __user *udata;
int op;
if (get_user(op, &arg->op) || get_user(udata, &arg->data))
return -EFAULT;
return blkpg_do_ioctl(bdev, udata, op);
}
#ifdef CONFIG_COMPAT
struct compat_blkpg_ioctl_arg {
compat_int_t op;
compat_int_t flags;
compat_int_t datalen;
compat_caddr_t data;
};
static int compat_blkpg_ioctl(struct block_device *bdev,
struct compat_blkpg_ioctl_arg __user *arg)
{
compat_caddr_t udata;
int op;
if (get_user(op, &arg->op) || get_user(udata, &arg->data))
return -EFAULT;
return blkpg_do_ioctl(bdev, compat_ptr(udata), op);
}
#endif
/*
* Check that [start, start + len) is a valid range from the block device's
* perspective, including verifying that it can be correctly translated into
* logical block addresses.
*/
static int blk_validate_byte_range(struct block_device *bdev,
uint64_t start, uint64_t len)
{
unsigned int bs_mask = bdev_logical_block_size(bdev) - 1;
uint64_t end;
if ((start | len) & bs_mask)
return -EINVAL;
if (!len)
return -EINVAL;
if (check_add_overflow(start, len, &end) || end > bdev_nr_bytes(bdev))
return -EINVAL;
return 0;
}
static int blk_ioctl_discard(struct block_device *bdev, blk_mode_t mode,
unsigned long arg)
{
uint64_t range[2], start, len;
struct bio *prev = NULL, *bio;
sector_t sector, nr_sects;
struct blk_plug plug;
int err;
if (copy_from_user(range, (void __user *)arg, sizeof(range)))
return -EFAULT;
start = range[0];
len = range[1];
if (!bdev_max_discard_sectors(bdev))
return -EOPNOTSUPP;
if (!(mode & BLK_OPEN_WRITE))
return -EBADF;
if (bdev_read_only(bdev))
return -EPERM;
err = blk_validate_byte_range(bdev, start, len);
if (err)
return err;
filemap_invalidate_lock(bdev->bd_mapping);
err = truncate_bdev_range(bdev, mode, start, start + len - 1);
if (err)
goto fail;
sector = start >> SECTOR_SHIFT;
nr_sects = len >> SECTOR_SHIFT;
blk_start_plug(&plug);
while (1) {
if (fatal_signal_pending(current)) {
if (prev)
bio_await_chain(prev);
err = -EINTR;
goto out_unplug;
}
bio = blk_alloc_discard_bio(bdev, §or, &nr_sects,
GFP_KERNEL);
if (!bio)
break;
prev = bio_chain_and_submit(prev, bio);
}
if (prev) {
err = submit_bio_wait(prev);
if (err == -EOPNOTSUPP)
err = 0;
bio_put(prev);
}
out_unplug:
blk_finish_plug(&plug);
fail:
filemap_invalidate_unlock(bdev->bd_mapping);
return err;
}
static int blk_ioctl_secure_erase(struct block_device *bdev, blk_mode_t mode,
void __user *argp)
{
uint64_t start, len, end;
uint64_t range[2];
int err;
if (!(mode & BLK_OPEN_WRITE))
return -EBADF;
if (!bdev_max_secure_erase_sectors(bdev))
return -EOPNOTSUPP;
if (copy_from_user(range, argp, sizeof(range)))
return -EFAULT;
start = range[0];
len = range[1];
if ((start & 511) || (len & 511))
return -EINVAL;
if (check_add_overflow(start, len, &end) ||
end > bdev_nr_bytes(bdev))
return -EINVAL;
filemap_invalidate_lock(bdev->bd_mapping);
err = truncate_bdev_range(bdev, mode, start, end - 1);
if (!err)
err = blkdev_issue_secure_erase(bdev, start >> 9, len >> 9,
GFP_KERNEL);
filemap_invalidate_unlock(bdev->bd_mapping);
return err;
}
static int blk_ioctl_zeroout(struct block_device *bdev, blk_mode_t mode,
unsigned long arg)
{
uint64_t range[2];
uint64_t start, end, len;
int err;
if (!(mode & BLK_OPEN_WRITE))
return -EBADF;
if (copy_from_user(range, (void __user *)arg, sizeof(range)))
return -EFAULT;
start = range[0];
len = range[1];
end = start + len - 1;
if (start & 511)
return -EINVAL;
if (len & 511)
return -EINVAL;
if (end >= (uint64_t)bdev_nr_bytes(bdev))
return -EINVAL;
if (end < start)
return -EINVAL;
/* Invalidate the page cache, including dirty pages */
filemap_invalidate_lock(bdev->bd_mapping);
err = truncate_bdev_range(bdev, mode, start, end);
if (err)
goto fail;
err = blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL,
BLKDEV_ZERO_NOUNMAP | BLKDEV_ZERO_KILLABLE);
fail:
filemap_invalidate_unlock(bdev->bd_mapping);
return err;
}
static int put_ushort(unsigned short __user *argp, unsigned short val)
{
return put_user(val, argp);
}
static int put_int(int __user *argp, int val)
{
return put_user(val, argp);
}
static int put_uint(unsigned int __user *argp, unsigned int val)
{
return put_user(val, argp);
}
static int put_long(long __user *argp, long val)
{
return put_user(val, argp);
}
static int put_ulong(unsigned long __user *argp, unsigned long val)
{
return put_user(val, argp);
}
static int put_u64(u64 __user *argp, u64 val)
{
return put_user(val, argp);
}
#ifdef CONFIG_COMPAT
static int compat_put_long(compat_long_t __user *argp, long val)
{
return put_user(val, argp);
}
static int compat_put_ulong(compat_ulong_t __user *argp, compat_ulong_t val)
{
return put_user(val, argp);
}
#endif
#ifdef CONFIG_COMPAT
/*
* This is the equivalent of compat_ptr_ioctl(), to be used by block
* drivers that implement only commands that are completely compatible
* between 32-bit and 64-bit user space
*/
int blkdev_compat_ptr_ioctl(struct block_device *bdev, blk_mode_t mode,
unsigned cmd, unsigned long arg)
{
struct gendisk *disk = bdev->bd_disk;
if (disk->fops->ioctl)
return disk->fops->ioctl(bdev, mode, cmd,
(unsigned long)compat_ptr(arg));
return -ENOIOCTLCMD;
}
EXPORT_SYMBOL(blkdev_compat_ptr_ioctl);
#endif
static bool blkdev_pr_allowed(struct block_device *bdev, blk_mode_t mode)
{
/* no sense to make reservations for partitions */
if (bdev_is_partition(bdev))
return false;
if (capable(CAP_SYS_ADMIN))
return true;
/*
* Only allow unprivileged reservations if the file descriptor is open
* for writing.
*/
return mode & BLK_OPEN_WRITE;
}
static int blkdev_pr_register(struct block_device *bdev, blk_mode_t mode,
struct pr_registration __user *arg)
{
const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
struct pr_registration reg;
if (!blkdev_pr_allowed(bdev, mode))
return -EPERM;
if (!ops || !ops->pr_register)
return -EOPNOTSUPP;
if (copy_from_user(®, arg, sizeof(reg)))
return -EFAULT;
if (reg.flags & ~PR_FL_IGNORE_KEY)
return -EOPNOTSUPP;
return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags);
}
static int blkdev_pr_reserve(struct block_device *bdev, blk_mode_t mode,
struct pr_reservation __user *arg)
{
const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
struct pr_reservation rsv;
if (!blkdev_pr_allowed(bdev, mode))
return -EPERM;
if (!ops || !ops->pr_reserve)
return -EOPNOTSUPP;
if (copy_from_user(&rsv, arg, sizeof(rsv)))
return -EFAULT;
if (rsv.flags & ~PR_FL_IGNORE_KEY)
return -EOPNOTSUPP;
return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags);
}
static int blkdev_pr_release(struct block_device *bdev, blk_mode_t mode,
struct pr_reservation __user *arg)
{
const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
struct pr_reservation rsv;
if (!blkdev_pr_allowed(bdev, mode))
return -EPERM;
if (!ops || !ops->pr_release)
return -EOPNOTSUPP;
if (copy_from_user(&rsv, arg, sizeof(rsv)))
return -EFAULT;
if (rsv.flags)
return -EOPNOTSUPP;
return ops->pr_release(bdev, rsv.key, rsv.type);
}
static int blkdev_pr_preempt(struct block_device *bdev, blk_mode_t mode,
struct pr_preempt __user *arg, bool abort)
{
const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
struct pr_preempt p;
if (!blkdev_pr_allowed(bdev, mode))
return -EPERM;
if (!ops || !ops->pr_preempt)
return -EOPNOTSUPP;
if (copy_from_user(&p, arg, sizeof(p)))
return -EFAULT;
if (p.flags)
return -EOPNOTSUPP;
return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort);
}
static int blkdev_pr_clear(struct block_device *bdev, blk_mode_t mode,
struct pr_clear __user *arg)
{
const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
struct pr_clear c;
if (!blkdev_pr_allowed(bdev, mode))
return -EPERM;
if (!ops || !ops->pr_clear)
return -EOPNOTSUPP;
if (copy_from_user(&c, arg, sizeof(c)))
return -EFAULT;
if (c.flags)
return -EOPNOTSUPP;
return ops->pr_clear(bdev, c.key);
}
static int blkdev_flushbuf(struct block_device *bdev, unsigned cmd,
unsigned long arg)
{
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
mutex_lock(&bdev->bd_holder_lock);
if (bdev->bd_holder_ops && bdev->bd_holder_ops->sync)
bdev->bd_holder_ops->sync(bdev);
else {
mutex_unlock(&bdev->bd_holder_lock);
sync_blockdev(bdev);
}
invalidate_bdev(bdev);
return 0;
}
static int blkdev_roset(struct block_device *bdev, unsigned cmd,
unsigned long arg)
{
int ret, n;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (get_user(n, (int __user *)arg))
return -EFAULT;
if (bdev->bd_disk->fops->set_read_only) {
ret = bdev->bd_disk->fops->set_read_only(bdev, n);
if (ret)
return ret;
}
if (n)
bdev_set_flag(bdev, BD_READ_ONLY);
else
bdev_clear_flag(bdev, BD_READ_ONLY);
return 0;
}
static int blkdev_getgeo(struct block_device *bdev,
struct hd_geometry __user *argp)
{
struct gendisk *disk = bdev->bd_disk;
struct hd_geometry geo;
int ret;
if (!argp)
return -EINVAL;
if (!disk->fops->getgeo)
return -ENOTTY;
/*
* We need to set the startsect first, the driver may
* want to override it.
*/
memset(&geo, 0, sizeof(geo));
geo.start = get_start_sect(bdev);
ret = disk->fops->getgeo(bdev, &geo);
if (ret)
return ret;
if (copy_to_user(argp, &geo, sizeof(geo)))
return -EFAULT;
return 0;
}
#ifdef CONFIG_COMPAT
struct compat_hd_geometry {
unsigned char heads;
unsigned char sectors;
unsigned short cylinders;
u32 start;
};
static int compat_hdio_getgeo(struct block_device *bdev,
struct compat_hd_geometry __user *ugeo)
{
struct gendisk *disk = bdev->bd_disk;
struct hd_geometry geo;
int ret;
if (!ugeo)
return -EINVAL;
if (!disk->fops->getgeo)
return -ENOTTY;
memset(&geo, 0, sizeof(geo));
/*
* We need to set the startsect first, the driver may
* want to override it.
*/
geo.start = get_start_sect(bdev);
ret = disk->fops->getgeo(bdev, &geo);
if (ret)
return ret;
ret = copy_to_user(ugeo, &geo, 4);
ret |= put_user(geo.start, &ugeo->start);
if (ret)
ret = -EFAULT;
return ret;
}
#endif
/* set the logical block size */
static int blkdev_bszset(struct file *file, blk_mode_t mode,
int __user *argp)
{
// this one might be file_inode(file)->i_rdev - a rare valid
// use of file_inode() for those.
dev_t dev = I_BDEV(file->f_mapping->host)->bd_dev;
struct file *excl_file;
int ret, n;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (!argp)
return -EINVAL;
if (get_user(n, argp))
return -EFAULT;
if (mode & BLK_OPEN_EXCL)
return set_blocksize(file, n);
excl_file = bdev_file_open_by_dev(dev, mode, &dev, NULL);
if (IS_ERR(excl_file))
return -EBUSY;
ret = set_blocksize(excl_file, n);
fput(excl_file);
return ret;
}
/*
* Common commands that are handled the same way on native and compat
* user space. Note the separate arg/argp parameters that are needed
* to deal with the compat_ptr() conversion.
*/
static int blkdev_common_ioctl(struct block_device *bdev, blk_mode_t mode,
unsigned int cmd, unsigned long arg,
void __user *argp)
{
unsigned int max_sectors;
switch (cmd) {
case BLKFLSBUF:
return blkdev_flushbuf(bdev, cmd, arg);
case BLKROSET:
return blkdev_roset(bdev, cmd, arg);
case BLKDISCARD:
return blk_ioctl_discard(bdev, mode, arg);
case BLKSECDISCARD:
return blk_ioctl_secure_erase(bdev, mode, argp);
case BLKZEROOUT:
return blk_ioctl_zeroout(bdev, mode, arg);
case BLKGETDISKSEQ:
return put_u64(argp, bdev->bd_disk->diskseq);
case BLKREPORTZONE:
return blkdev_report_zones_ioctl(bdev, cmd, arg);
case BLKRESETZONE:
case BLKOPENZONE:
case BLKCLOSEZONE:
case BLKFINISHZONE:
return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg);
case BLKGETZONESZ:
return put_uint(argp, bdev_zone_sectors(bdev));
case BLKGETNRZONES:
return put_uint(argp, bdev_nr_zones(bdev));
case BLKROGET:
return put_int(argp, bdev_read_only(bdev) != 0);
case BLKSSZGET: /* get block device logical block size */
return put_int(argp, bdev_logical_block_size(bdev));
case BLKPBSZGET: /* get block device physical block size */
return put_uint(argp, bdev_physical_block_size(bdev));
case BLKIOMIN:
return put_uint(argp, bdev_io_min(bdev));
case BLKIOOPT:
return put_uint(argp, bdev_io_opt(bdev));
case BLKALIGNOFF:
return put_int(argp, bdev_alignment_offset(bdev));
case BLKDISCARDZEROES:
return put_uint(argp, 0);
case BLKSECTGET:
max_sectors = min_t(unsigned int, USHRT_MAX,
queue_max_sectors(bdev_get_queue(bdev)));
return put_ushort(argp, max_sectors);
case BLKROTATIONAL:
return put_ushort(argp, !bdev_nonrot(bdev));
case BLKRASET:
case BLKFRASET:
if(!capable(CAP_SYS_ADMIN))
return -EACCES;
bdev->bd_disk->bdi->ra_pages = (arg * 512) / PAGE_SIZE;
return 0;
case BLKRRPART:
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (bdev_is_partition(bdev))
return -EINVAL;
return disk_scan_partitions(bdev->bd_disk,
mode | BLK_OPEN_STRICT_SCAN);
case BLKTRACESTART:
case BLKTRACESTOP:
case BLKTRACETEARDOWN:
return blk_trace_ioctl(bdev, cmd, argp);
case IOC_PR_REGISTER:
return blkdev_pr_register(bdev, mode, argp);
case IOC_PR_RESERVE:
return blkdev_pr_reserve(bdev, mode, argp);
case IOC_PR_RELEASE:
return blkdev_pr_release(bdev, mode, argp);
case IOC_PR_PREEMPT:
return blkdev_pr_preempt(bdev, mode, argp, false);
case IOC_PR_PREEMPT_ABORT:
return blkdev_pr_preempt(bdev, mode, argp, true);
case IOC_PR_CLEAR:
return blkdev_pr_clear(bdev, mode, argp);
default:
return -ENOIOCTLCMD;
}
}
/*
* Always keep this in sync with compat_blkdev_ioctl()
* to handle all incompatible commands in both functions.
*
* New commands must be compatible and go into blkdev_common_ioctl
*/
long blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
{
struct block_device *bdev = I_BDEV(file->f_mapping->host);
void __user *argp = (void __user *)arg;
blk_mode_t mode = file_to_blk_mode(file);
int ret;
switch (cmd) {
/* These need separate implementations for the data structure */
case HDIO_GETGEO:
return blkdev_getgeo(bdev, argp);
case BLKPG:
return blkpg_ioctl(bdev, argp);
/* Compat mode returns 32-bit data instead of 'long' */
case BLKRAGET:
case BLKFRAGET:
if (!argp)
return -EINVAL;
return put_long(argp,
(bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512);
case BLKGETSIZE:
if (bdev_nr_sectors(bdev) > ~0UL)
return -EFBIG;
return put_ulong(argp, bdev_nr_sectors(bdev));
/* The data is compatible, but the command number is different */
case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
return put_int(argp, block_size(bdev));
case BLKBSZSET:
return blkdev_bszset(file, mode, argp);
case BLKGETSIZE64:
return put_u64(argp, bdev_nr_bytes(bdev));
/* Incompatible alignment on i386 */
case BLKTRACESETUP:
return blk_trace_ioctl(bdev, cmd, argp);
default:
break;
}
ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
if (ret != -ENOIOCTLCMD)
return ret;
if (!bdev->bd_disk->fops->ioctl)
return -ENOTTY;
return bdev->bd_disk->fops->ioctl(bdev, mode, cmd, arg);
}
#ifdef CONFIG_COMPAT
#define BLKBSZGET_32 _IOR(0x12, 112, int)
#define BLKBSZSET_32 _IOW(0x12, 113, int)
#define BLKGETSIZE64_32 _IOR(0x12, 114, int)
/* Most of the generic ioctls are handled in the normal fallback path.
This assumes the blkdev's low level compat_ioctl always returns
ENOIOCTLCMD for unknown ioctls. */
long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
{
int ret;
void __user *argp = compat_ptr(arg);
struct block_device *bdev = I_BDEV(file->f_mapping->host);
struct gendisk *disk = bdev->bd_disk;
blk_mode_t mode = file_to_blk_mode(file);
switch (cmd) {
/* These need separate implementations for the data structure */
case HDIO_GETGEO:
return compat_hdio_getgeo(bdev, argp);
case BLKPG:
return compat_blkpg_ioctl(bdev, argp);
/* Compat mode returns 32-bit data instead of 'long' */
case BLKRAGET:
case BLKFRAGET:
if (!argp)
return -EINVAL;
return compat_put_long(argp,
(bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512);
case BLKGETSIZE:
if (bdev_nr_sectors(bdev) > ~(compat_ulong_t)0)
return -EFBIG;
return compat_put_ulong(argp, bdev_nr_sectors(bdev));
/* The data is compatible, but the command number is different */
case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
return put_int(argp, bdev_logical_block_size(bdev));
case BLKBSZSET_32:
return blkdev_bszset(file, mode, argp);
case BLKGETSIZE64_32:
return put_u64(argp, bdev_nr_bytes(bdev));
/* Incompatible alignment on i386 */
case BLKTRACESETUP32:
return blk_trace_ioctl(bdev, cmd, argp);
default:
break;
}
ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
return ret;
}
#endif
struct blk_iou_cmd {
int res;
bool nowait;
};
static void blk_cmd_complete(struct io_uring_cmd *cmd, unsigned int issue_flags)
{
struct blk_iou_cmd *bic = io_uring_cmd_to_pdu(cmd, struct blk_iou_cmd);
if (bic->res == -EAGAIN && bic->nowait)
io_uring_cmd_issue_blocking(cmd);
else
io_uring_cmd_done(cmd, bic->res, 0, issue_flags);
}
static void bio_cmd_bio_end_io(struct bio *bio)
{
struct io_uring_cmd *cmd = bio->bi_private;
struct blk_iou_cmd *bic = io_uring_cmd_to_pdu(cmd, struct blk_iou_cmd);
if (unlikely(bio->bi_status) && !bic->res)
bic->res = blk_status_to_errno(bio->bi_status);
io_uring_cmd_do_in_task_lazy(cmd, blk_cmd_complete);
bio_put(bio);
}
static int blkdev_cmd_discard(struct io_uring_cmd *cmd,
struct block_device *bdev,
uint64_t start, uint64_t len, bool nowait)
{
struct blk_iou_cmd *bic = io_uring_cmd_to_pdu(cmd, struct blk_iou_cmd);
gfp_t gfp = nowait ? GFP_NOWAIT : GFP_KERNEL;
sector_t sector = start >> SECTOR_SHIFT;
sector_t nr_sects = len >> SECTOR_SHIFT;
struct bio *prev = NULL, *bio;
int err;
if (!bdev_max_discard_sectors(bdev))
return -EOPNOTSUPP;
if (!(file_to_blk_mode(cmd->file) & BLK_OPEN_WRITE))
return -EBADF;
if (bdev_read_only(bdev))
return -EPERM;
err = blk_validate_byte_range(bdev, start, len);
if (err)
return err;
err = filemap_invalidate_pages(bdev->bd_mapping, start,
start + len - 1, nowait);
if (err)
return err;
while (true) {
bio = blk_alloc_discard_bio(bdev, §or, &nr_sects, gfp);
if (!bio)
break;
if (nowait) {
/*
* Don't allow multi-bio non-blocking submissions as
* subsequent bios may fail but we won't get a direct
* indication of that. Normally, the caller should
* retry from a blocking context.
*/
if (unlikely(nr_sects)) {
bio_put(bio);
return -EAGAIN;
}
bio->bi_opf |= REQ_NOWAIT;
}
prev = bio_chain_and_submit(prev, bio);
}
if (unlikely(!prev))
return -EAGAIN;
if (unlikely(nr_sects))
bic->res = -EAGAIN;
prev->bi_private = cmd;
prev->bi_end_io = bio_cmd_bio_end_io;
submit_bio(prev);
return -EIOCBQUEUED;
}
int blkdev_uring_cmd(struct io_uring_cmd *cmd, unsigned int issue_flags)
{
struct block_device *bdev = I_BDEV(cmd->file->f_mapping->host);
struct blk_iou_cmd *bic = io_uring_cmd_to_pdu(cmd, struct blk_iou_cmd);
const struct io_uring_sqe *sqe = cmd->sqe;
u32 cmd_op = cmd->cmd_op;
uint64_t start, len;
if (unlikely(sqe->ioprio || sqe->__pad1 || sqe->len ||
sqe->rw_flags || sqe->file_index))
return -EINVAL;
bic->res = 0;
bic->nowait = issue_flags & IO_URING_F_NONBLOCK;
start = READ_ONCE(sqe->addr);
len = READ_ONCE(sqe->addr3);
switch (cmd_op) {
case BLOCK_URING_CMD_DISCARD:
return blkdev_cmd_discard(cmd, bdev, start, len, bic->nowait);
}
return -EINVAL;
}
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