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file-posix: Implement bdrv_co_copy_range

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With copy_file_range(2), we can implement the bdrv_co_copy_range
semantics.

Signed-off-by: Fam Zheng <famz@redhat.com>
Message-id: 20180601092648.24614-6-famz@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Fam Zheng 2018-06-01 17:26:43 +08:00 • committed by Stefan Hajnoczi
parent fd9fcd37a8
commit 1efad060d7
3 changed files with 120 additions and 5 deletions
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98
block/file-posix.c
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@ -59,6 +59,7 @@
#ifdef __linux__
#include <sys/ioctl.h>
#include <sys/param.h>
#include <sys/syscall.h>
#include <linux/cdrom.h>
#include <linux/fd.h>
#include <linux/fs.h>
@ -187,6 +188,8 @@ typedef struct RawPosixAIOData {
#define aio_ioctl_cmd aio_nbytes /* for QEMU_AIO_IOCTL */
off_t aio_offset;
int aio_type;
int aio_fd2;
off_t aio_offset2;
} RawPosixAIOData;
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
@ -1446,6 +1449,49 @@ static ssize_t handle_aiocb_write_zeroes(RawPosixAIOData *aiocb)
return -ENOTSUP;
}
#ifndef HAVE_COPY_FILE_RANGE
static off_t copy_file_range(int in_fd, off_t *in_off, int out_fd,
off_t *out_off, size_t len, unsigned int flags)
{
#ifdef __NR_copy_file_range
return syscall(__NR_copy_file_range, in_fd, in_off, out_fd,
out_off, len, flags);
#else
errno = ENOSYS;
return -1;
#endif
}
#endif
static ssize_t handle_aiocb_copy_range(RawPosixAIOData *aiocb)
{
uint64_t bytes = aiocb->aio_nbytes;
off_t in_off = aiocb->aio_offset;
off_t out_off = aiocb->aio_offset2;
while (bytes) {
ssize_t ret = copy_file_range(aiocb->aio_fildes, &in_off,
aiocb->aio_fd2, &out_off,
bytes, 0);
if (ret == -EINTR) {
continue;
}
if (ret < 0) {
if (errno == ENOSYS) {
return -ENOTSUP;
} else {
return -errno;
}
}
if (!ret) {
/* No progress (e.g. when beyond EOF), fall back to buffer I/O. */
return -ENOTSUP;
}
bytes -= ret;
}
return 0;
}
static ssize_t handle_aiocb_discard(RawPosixAIOData *aiocb)
{
int ret = -EOPNOTSUPP;
@ -1526,6 +1572,9 @@ static int aio_worker(void *arg)
case QEMU_AIO_WRITE_ZEROES:
ret = handle_aiocb_write_zeroes(aiocb);
break;
case QEMU_AIO_COPY_RANGE:
ret = handle_aiocb_copy_range(aiocb);
break;
default:
fprintf(stderr, "invalid aio request (0x%x)\n", aiocb->aio_type);
ret = -EINVAL;
@ -1536,9 +1585,10 @@ static int aio_worker(void *arg)
return ret;
}
static int paio_submit_co(BlockDriverState *bs, int fd,
int64_t offset, QEMUIOVector *qiov,
int bytes, int type)
static int paio_submit_co_full(BlockDriverState *bs, int fd,
int64_t offset, int fd2, int64_t offset2,
QEMUIOVector *qiov,
int bytes, int type)
{
RawPosixAIOData *acb = g_new(RawPosixAIOData, 1);
ThreadPool *pool;
@ -1546,6 +1596,8 @@ static int paio_submit_co(BlockDriverState *bs, int fd,
acb->bs = bs;
acb->aio_type = type;
acb->aio_fildes = fd;
acb->aio_fd2 = fd2;
acb->aio_offset2 = offset2;
acb->aio_nbytes = bytes;
acb->aio_offset = offset;
@ -1561,6 +1613,13 @@ static int paio_submit_co(BlockDriverState *bs, int fd,
return thread_pool_submit_co(pool, aio_worker, acb);
}
static inline int paio_submit_co(BlockDriverState *bs, int fd,
int64_t offset, QEMUIOVector *qiov,
int bytes, int type)
{
return paio_submit_co_full(bs, fd, offset, -1, 0, qiov, bytes, type);
}
static BlockAIOCB *paio_submit(BlockDriverState *bs, int fd,
int64_t offset, QEMUIOVector *qiov, int bytes,
BlockCompletionFunc *cb, void *opaque, int type)
@ -2451,6 +2510,35 @@ static void raw_abort_perm_update(BlockDriverState *bs)
raw_handle_perm_lock(bs, RAW_PL_ABORT, 0, 0, NULL);
}
static int coroutine_fn raw_co_copy_range_from(BlockDriverState *bs,
BdrvChild *src, uint64_t src_offset,
BdrvChild *dst, uint64_t dst_offset,
uint64_t bytes, BdrvRequestFlags flags)
{
return bdrv_co_copy_range_to(src, src_offset, dst, dst_offset, bytes, flags);
}
static int coroutine_fn raw_co_copy_range_to(BlockDriverState *bs,
BdrvChild *src, uint64_t src_offset,
BdrvChild *dst, uint64_t dst_offset,
uint64_t bytes, BdrvRequestFlags flags)
{
BDRVRawState *s = bs->opaque;
BDRVRawState *src_s;
assert(dst->bs == bs);
if (src->bs->drv->bdrv_co_copy_range_to != raw_co_copy_range_to) {
return -ENOTSUP;
}
src_s = src->bs->opaque;
if (fd_open(bs) < 0 || fd_open(bs) < 0) {
return -EIO;
}
return paio_submit_co_full(bs, src_s->fd, src_offset, s->fd, dst_offset,
NULL, bytes, QEMU_AIO_COPY_RANGE);
}
BlockDriver bdrv_file = {
.format_name = "file",
.protocol_name = "file",
@ -2474,6 +2562,8 @@ BlockDriver bdrv_file = {
.bdrv_co_pwritev = raw_co_pwritev,
.bdrv_aio_flush = raw_aio_flush,
.bdrv_aio_pdiscard = raw_aio_pdiscard,
.bdrv_co_copy_range_from = raw_co_copy_range_from,
.bdrv_co_copy_range_to = raw_co_copy_range_to,
.bdrv_refresh_limits = raw_refresh_limits,
.bdrv_io_plug = raw_aio_plug,
.bdrv_io_unplug = raw_aio_unplug,
@ -2952,6 +3042,8 @@ static BlockDriver bdrv_host_device = {
.bdrv_co_pwritev = raw_co_pwritev,
.bdrv_aio_flush = raw_aio_flush,
.bdrv_aio_pdiscard = hdev_aio_pdiscard,
.bdrv_co_copy_range_from = raw_co_copy_range_from,
.bdrv_co_copy_range_to = raw_co_copy_range_to,
.bdrv_refresh_limits = raw_refresh_limits,
.bdrv_io_plug = raw_aio_plug,
.bdrv_io_unplug = raw_aio_unplug,