@@ -124,6 +124,36 @@ static int blk_ioctl_discard(struct block_device *bdev, fmode_t mode,
return err;
}
+static int blk_ioctl_copy(struct block_device *bdev, fmode_t mode,
+ unsigned long arg)
+{
+ struct copy_range crange, *ranges = NULL;
+ size_t payload_size = 0;
+ int ret;
+
+ if (!(mode & FMODE_WRITE))
+ return -EBADF;
+
+ if (copy_from_user(&crange, (void __user *)arg, sizeof(crange)))
+ return -EFAULT;
+
+ if (unlikely(!crange.nr_range || crange.reserved || crange.nr_range >= MAX_COPY_NR_RANGE))
+ return -EINVAL;
+
+ payload_size = (crange.nr_range * sizeof(struct range_entry)) + sizeof(crange);
+
+ ranges = memdup_user((void __user *)arg, payload_size);
+ if (IS_ERR(ranges))
+ return PTR_ERR(ranges);
+
+ ret = blkdev_issue_copy(bdev, ranges->nr_range, ranges->range_list, bdev, GFP_KERNEL);
+ if (copy_to_user((void __user *)arg, ranges, payload_size))
+ ret = -EFAULT;
+
+ kfree(ranges);
+ return ret;
+}
+
static int blk_ioctl_zeroout(struct block_device *bdev, fmode_t mode,
unsigned long arg)
{
@@ -455,6 +485,8 @@ static int blkdev_common_ioctl(struct block_device *bdev, fmode_t mode,
case BLKSECDISCARD:
return blk_ioctl_discard(bdev, mode, arg,
BLKDEV_DISCARD_SECURE);
+ case BLKCOPY:
+ return blk_ioctl_copy(bdev, mode, arg);
case BLKZEROOUT:
return blk_ioctl_zeroout(bdev, mode, arg);
case BLKGETDISKSEQ:
@@ -78,6 +78,14 @@ struct range_entry {
__u64 comp_len;
};
+struct copy_range {
+ __u64 nr_range;
+ __u64 reserved;
+
+ /* Range_list always must be at the end */
+ struct range_entry range_list[];
+};
+
/* extent-same (dedupe) ioctls; these MUST match the btrfs ioctl definitions */
#define FILE_DEDUPE_RANGE_SAME 0
#define FILE_DEDUPE_RANGE_DIFFERS 1
@@ -199,6 +207,7 @@ struct fsxattr {
#define BLKROTATIONAL _IO(0x12,126)
#define BLKZEROOUT _IO(0x12,127)
#define BLKGETDISKSEQ _IOR(0x12,128,__u64)
+#define BLKCOPY _IOWR(0x12, 129, struct copy_range)
/*
* A jump here: 130-136 are reserved for zoned block devices
* (see uapi/linux/blkzoned.h)
Add new BLKCOPY ioctl that offloads copying of one or more sources ranges to one or more destination in a device. COPY ioctl accepts a 'copy_range' structure that contains no of range, a reserved field , followed by an array of ranges. Each source range is represented by 'range_entry' that contains source start offset, destination start offset and length of source ranges (in bytes) MAX_COPY_NR_RANGE, limits the number of entries for the IOCTL and MAX_COPY_TOTAL_LENGTH limits the total copy length, IOCTL can handle. Example code, to issue BLKCOPY: /* Sample example to copy three entries with [dest,src,len], * [32768, 0, 4096] [36864, 4096, 4096] [40960,8192,4096] on same device */ int main(void) { int i, ret, fd; unsigned long src = 0, dst = 32768, len = 4096; struct copy_range *cr; cr = (struct copy_range *)malloc(sizeof(*cr)+ (sizeof(struct range_entry)*3)); cr->nr_range = 3; cr->reserved = 0; for (i = 0; i< cr->nr_range; i++, src += len, dst += len) { cr->range_list[i].dst = dst; cr->range_list[i].src = src; cr->range_list[i].len = len; cr->range_list[i].comp_len = 0; } fd = open("/dev/nvme0n1", O_RDWR); if (fd < 0) return 1; ret = ioctl(fd, BLKCOPY, cr); if (ret != 0) printf("copy failed, ret= %d\n", ret); for (i=0; i< cr->nr_range; i++) if (cr->range_list[i].len != cr->range_list[i].comp_len) printf("Partial copy for entry %d: requested %llu, completed %llu\n", i, cr->range_list[i].len, cr->range_list[i].comp_len); close(fd); free(cr); return ret; } Signed-off-by: Nitesh Shetty <nj.shetty@samsung.com> Signed-off-by: Javier González <javier.gonz@samsung.com> Signed-off-by: Arnav Dawn <arnav.dawn@samsung.com> --- block/ioctl.c | 32 ++++++++++++++++++++++++++++++++ include/uapi/linux/fs.h | 9 +++++++++ 2 files changed, 41 insertions(+)