On 4/26/22 12:12, Nitesh Shetty wrote:
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 <[email protected]> Signed-off-by: Javier González <[email protected]> Signed-off-by: Arnav Dawn <[email protected]> --- block/ioctl.c | 32 ++++++++++++++++++++++++++++++++ include/uapi/linux/fs.h | 9 +++++++++ 2 files changed, 41 insertions(+)
Reviewed-by: Hannes Reinecke <[email protected]> Cheers, Hannes -- Dr. Hannes Reinecke Kernel Storage Architect [email protected] +49 911 74053 688 SUSE Software Solutions Germany GmbH, Maxfeldstr. 5, 90409 Nürnberg HRB 36809 (AG Nürnberg), GF: Felix Imendörffer -- dm-devel mailing list [email protected] https://listman.redhat.com/mailman/listinfo/dm-devel
