From 38a444dbad000639aa36f51f10319be7bc78dabf Mon Sep 17 00:00:00 2001

From: Fam Zheng <famz@redhat.com>

Date: Fri, 29 Jun 2018 06:11:45 +0200

Subject: [PATCH 171/268] file-posix: Implement bdrv_co_copy_range

RH-Author: Fam Zheng <famz@redhat.com>

Message-id: <20180629061153.12687-6-famz@redhat.com>

Patchwork-id: 81156

O-Subject: [RHEL-7.6 qemu-kvm-rhev PATCH v2 05/13] file-posix: Implement bdrv_co_copy_range

Bugzilla: 1482537

RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>

RH-Acked-by: Max Reitz <mreitz@redhat.com>

RH-Acked-by: Kevin Wolf <kwolf@redhat.com>

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>

(cherry picked from commit 1efad060d7e131dd52ecd1e038a6ddd37a3940c8)

Signed-off-by: Fam Zheng <famz@redhat.com>

Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>

---

 block/file-posix.c      | 98 +++++++++++++++++++++++++++++++++++++++++++++++--

 configure               | 17 +++++++++

 include/block/raw-aio.h | 10 ++++-

 3 files changed, 120 insertions(+), 5 deletions(-)

diff --git a/block/file-posix.c b/block/file-posix.c

index 370a483..29ff699 100644

--- a/block/file-posix.c

+++ b/block/file-posix.c

@@ -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>

@@ -185,6 +186,8 @@ 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__)

@@ -1422,6 +1425,49 @@ 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;

@@ -1502,6 +1548,9 @@ 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;

@@ -1512,9 +1561,10 @@ 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;

@@ -1522,6 +1572,8 @@ 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;

@@ -1537,6 +1589,13 @@ 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)

@@ -2346,6 +2405,35 @@ 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",

@@ -2368,6 +2456,8 @@ 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,

@@ -2845,6 +2935,8 @@ 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,

diff --git a/configure b/configure

index 7358269..23d8d18 100755

--- a/configure

+++ b/configure

@@ -5147,6 +5147,20 @@ if test "$fortify_source" != "no"; then

   fi

 fi

+###############################################

+# Check if copy_file_range is provided by glibc

+have_copy_file_range=no

+cat > $TMPC << EOF

+#include <unistd.h>

+int main(void) {

+  copy_file_range(0, NULL, 0, NULL, 0, 0);

+  return 0;

+}

+EOF

+if compile_prog "" "" ; then

+    have_copy_file_range=yes

+fi

+

 ##########################################

 # check if struct fsxattr is available via linux/fs.h

@@ -6221,6 +6235,9 @@ fi

 if test "$have_fsxattr" = "yes" ; then

     echo "HAVE_FSXATTR=y" >> $config_host_mak

 fi

+if test "$have_copy_file_range" = "yes" ; then

+    echo "HAVE_COPY_FILE_RANGE=y" >> $config_host_mak

+fi

 if test "$vte" = "yes" ; then

   echo "CONFIG_VTE=y" >> $config_host_mak

   echo "VTE_CFLAGS=$vte_cflags" >> $config_host_mak

diff --git a/include/block/raw-aio.h b/include/block/raw-aio.h

index a4cdbbf..3240530 100644

--- a/include/block/raw-aio.h

+++ b/include/block/raw-aio.h

@@ -25,9 +25,15 @@

 #define QEMU_AIO_FLUSH        0x0008

 #define QEMU_AIO_DISCARD      0x0010

 #define QEMU_AIO_WRITE_ZEROES 0x0020

+#define QEMU_AIO_COPY_RANGE   0x0040

 #define QEMU_AIO_TYPE_MASK \

-        (QEMU_AIO_READ|QEMU_AIO_WRITE|QEMU_AIO_IOCTL|QEMU_AIO_FLUSH| \

-         QEMU_AIO_DISCARD|QEMU_AIO_WRITE_ZEROES)

+        (QEMU_AIO_READ | \

+         QEMU_AIO_WRITE | \

+         QEMU_AIO_IOCTL | \

+         QEMU_AIO_FLUSH | \

+         QEMU_AIO_DISCARD | \

+         QEMU_AIO_WRITE_ZEROES | \

+         QEMU_AIO_COPY_RANGE)

 /* AIO flags */

 #define QEMU_AIO_MISALIGNED   0x1000

-- 

1.8.3.1