diff options
| -rw-r--r-- | block/ioctl.c | 28 | ||||
| -rw-r--r-- | include/uapi/linux/pr.h | 7 |
2 files changed, 35 insertions, 0 deletions
diff --git a/block/ioctl.c b/block/ioctl.c index c0802ebf54a6..61feed686418 100644 --- a/block/ioctl.c +++ b/block/ioctl.c @@ -477,6 +477,32 @@ out: return ret; } +static int blkdev_pr_read_reservation(struct block_device *bdev, + blk_mode_t mode, struct pr_read_reservation __user *arg) +{ + const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; + struct pr_held_reservation rsv = {}; + struct pr_read_reservation out = {}; + int ret; + + if (!blkdev_pr_allowed(bdev, mode)) + return -EPERM; + if (!ops || !ops->pr_read_reservation) + return -EOPNOTSUPP; + + ret = ops->pr_read_reservation(bdev, &rsv); + if (ret) + return ret; + + out.key = rsv.key; + out.generation = rsv.generation; + out.type = rsv.type; + + if (copy_to_user(arg, &out, sizeof(out))) + return -EFAULT; + return 0; +} + static int blkdev_flushbuf(struct block_device *bdev, unsigned cmd, unsigned long arg) { @@ -701,6 +727,8 @@ static int blkdev_common_ioctl(struct block_device *bdev, blk_mode_t mode, return blkdev_pr_clear(bdev, mode, argp); case IOC_PR_READ_KEYS: return blkdev_pr_read_keys(bdev, mode, argp); + case IOC_PR_READ_RESERVATION: + return blkdev_pr_read_reservation(bdev, mode, argp); default: return blk_get_meta_cap(bdev, cmd, argp); } diff --git a/include/uapi/linux/pr.h b/include/uapi/linux/pr.h index fcb74eab92c8..847f3051057a 100644 --- a/include/uapi/linux/pr.h +++ b/include/uapi/linux/pr.h @@ -62,6 +62,12 @@ struct pr_read_keys { __u64 keys_ptr; }; +struct pr_read_reservation { + __u64 key; + __u32 generation; + __u32 type; +}; + #define PR_FL_IGNORE_KEY (1 << 0) /* ignore existing key */ #define IOC_PR_REGISTER _IOW('p', 200, struct pr_registration) @@ -71,5 +77,6 @@ struct pr_read_keys { #define IOC_PR_PREEMPT_ABORT _IOW('p', 204, struct pr_preempt) #define IOC_PR_CLEAR _IOW('p', 205, struct pr_clear) #define IOC_PR_READ_KEYS _IOWR('p', 206, struct pr_read_keys) +#define IOC_PR_READ_RESERVATION _IOR('p', 207, struct pr_read_reservation) #endif /* _UAPI_PR_H */ |