From: Enric Balletbo i Serra <enric.balletbo@xxxxxxxxxxxxx> Add a dm_ioctl_cmd to issue the equivalent of a DM ioctl call in kernel. Signed-off-by: Enric Balletbo i Serra <enric.balletbo@xxxxxxxxxxxxx> --- Changes since v9: - https://www.redhat.com/archives/linux-lvm/2018-September/msg00016.html - Reorganize variables --- drivers/md/dm-ioctl.c | 49 +++++++++++++++++++++++++++++++++++ include/linux/device-mapper.h | 6 +++++ 2 files changed, 55 insertions(+) diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c index f666778ad237..ae34c2030a9c 100644 --- a/drivers/md/dm-ioctl.c +++ b/drivers/md/dm-ioctl.c @@ -2018,3 +2018,52 @@ int dm_copy_name_and_uuid(struct mapped_device *md, char *name, char *uuid) return r; } + +/** + * dm_ioctl_cmd - Device mapper ioctl's + * @command: ioctl command + * @param: Pointer to device mapped ioctl struct + */ +int dm_ioctl_cmd(uint command, struct dm_ioctl *param) +{ + struct file *filp = NULL; + size_t input_param_size; + int ioctl_flags, r; + unsigned int cmd; + ioctl_fn fn; + + if (_IOC_TYPE(command) != DM_IOCTL) + return -ENOTTY; + + /* DM_DEV_ARM_POLL is not supported */ + if (command == DM_DEV_ARM_POLL) + return -EINVAL; + + cmd = _IOC_NR(command); + + /* + * Nothing more to do for the version command. + */ + if (cmd == DM_VERSION_CMD) + return 0; + + fn = lookup_ioctl(cmd, &ioctl_flags); + if (!fn) { + DMWARN("dm_ioctl: unknown command 0x%x", command); + return -ENOTTY; + } + + input_param_size = param->data_size; + r = validate_params(cmd, param); + if (r) + return r; + + param->data_size = sizeof(*param); + r = fn(filp, param, input_param_size); + + if (unlikely(param->flags & DM_BUFFER_FULL_FLAG) && + unlikely(ioctl_flags & IOCTL_FLAGS_NO_PARAMS)) + DMERR("ioctl %d tried to output some data but has IOCTL_FLAGS_NO_PARAMS set", cmd); + + return r; +} diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h index d7bee8669f10..8b2e4ae6a498 100644 --- a/include/linux/device-mapper.h +++ b/include/linux/device-mapper.h @@ -12,6 +12,7 @@ #include <linux/blkdev.h> #include <linux/math64.h> #include <linux/ratelimit.h> +#include <linux/dm-ioctl.h> struct dm_dev; struct dm_target; @@ -423,6 +424,11 @@ void dm_remap_zone_report(struct dm_target *ti, struct bio *bio, sector_t start); union map_info *dm_get_rq_mapinfo(struct request *rq); +/* + * Device mapper ioctl function. + */ +int dm_ioctl_cmd(unsigned int command, struct dm_ioctl *param); + struct queue_limits *dm_get_queue_limits(struct mapped_device *md); /* -- 2.19.1
