O Wed, Apr 27, 2022 at 11:48:57AM +0900, Damien Le Moal wrote: > On 4/26/22 19:12, 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; > > } > > Nice to have a code example. But please format it correctly. > acked -- Nitesh Shetty
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