| Message ID | 20220426101241.30100-4-nj.shetty@samsung.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Add Copy offload support | expand |
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. > > 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(+) > > diff --git a/block/ioctl.c b/block/ioctl.c > index 46949f1b0dba..58d93c20ff30 100644 > --- a/block/ioctl.c > +++ b/block/ioctl.c > @@ -120,6 +120,36 @@ 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_secure_erase(struct block_device *bdev, fmode_t mode, > void __user *argp) > { > @@ -481,6 +511,8 @@ 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: > diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h > index 822c28cebf3a..a3b13406ffb8 100644 > --- a/include/uapi/linux/fs.h > +++ b/include/uapi/linux/fs.h > @@ -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)
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 <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(+) > Reviewed-by: Hannes Reinecke <hare@suse.de> Cheers, Hannes
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
diff --git a/block/ioctl.c b/block/ioctl.c index 46949f1b0dba..58d93c20ff30 100644 --- a/block/ioctl.c +++ b/block/ioctl.c @@ -120,6 +120,36 @@ 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_secure_erase(struct block_device *bdev, fmode_t mode, void __user *argp) { @@ -481,6 +511,8 @@ 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: diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h index 822c28cebf3a..a3b13406ffb8 100644 --- a/include/uapi/linux/fs.h +++ b/include/uapi/linux/fs.h @@ -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(+)