[v5,04/10] block: Introduce a new ioctl for copy
Commit Message
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->ranges[i].dst = dst;
cr->ranges[i].src = src;
cr->ranges[i].len = len;
cr->ranges[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->ranges[i].len != cr->ranges[i].comp_len)
printf("Partial copy for entry %d: requested %llu,
completed %llu\n",
i, cr->ranges[i].len,
cr->ranges[i].comp_len);
close(fd);
free(cr);
return ret;
}
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Nitesh Shetty <nj.shetty@samsung.com>
Signed-off-by: Javier González <javier.gonz@samsung.com>
Signed-off-by: Anuj Gupta <anuj20.g@samsung.com>
---
block/ioctl.c | 36 ++++++++++++++++++++++++++++++++++++
include/uapi/linux/fs.h | 9 +++++++++
2 files changed, 45 insertions(+)
@@ -120,6 +120,40 @@ 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 ucopy_range, *kcopy_range = NULL;
+ size_t payload_size = 0;
+ int ret;
+
+ if (!(mode & FMODE_WRITE))
+ return -EBADF;
+
+ if (copy_from_user(&ucopy_range, (void __user *)arg,
+ sizeof(ucopy_range)))
+ return -EFAULT;
+
+ if (unlikely(!ucopy_range.nr_range || ucopy_range.reserved ||
+ ucopy_range.nr_range >= MAX_COPY_NR_RANGE))
+ return -EINVAL;
+
+ payload_size = (ucopy_range.nr_range * sizeof(struct range_entry)) +
+ sizeof(ucopy_range);
+
+ kcopy_range = memdup_user((void __user *)arg, payload_size);
+ if (IS_ERR(kcopy_range))
+ return PTR_ERR(kcopy_range);
+
+ ret = blkdev_issue_copy(bdev, bdev, kcopy_range->ranges,
+ kcopy_range->nr_range, NULL, NULL, GFP_KERNEL);
+ if (copy_to_user((void __user *)arg, kcopy_range, payload_size))
+ ret = -EFAULT;
+
+ kfree(kcopy_range);
+ return ret;
+}
+
static int blk_ioctl_secure_erase(struct block_device *bdev, fmode_t mode,
void __user *argp)
{
@@ -481,6 +515,8 @@ static int blkdev_common_ioctl(struct block_device *bdev, fmode_t mode,
return blk_ioctl_discard(bdev, mode, arg);
case BLKSECDISCARD:
return blk_ioctl_secure_erase(bdev, mode, argp);
+ case BLKCOPY:
+ return blk_ioctl_copy(bdev, mode, arg);
case BLKZEROOUT:
return blk_ioctl_zeroout(bdev, mode, arg);
case BLKGETDISKSEQ:
@@ -82,6 +82,14 @@ struct range_entry {
__u64 comp_len;
};
+struct copy_range {
+ __u64 nr_range;
+ __u64 reserved;
+
+ /* Ranges always must be at the end */
+ struct range_entry ranges[];
+};
+
/* extent-same (dedupe) ioctls; these MUST match the btrfs ioctl definitions */
#define FILE_DEDUPE_RANGE_SAME 0
#define FILE_DEDUPE_RANGE_DIFFERS 1
@@ -203,6 +211,7 @@ 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)