[Qemu-devel] [PATCH] block/nfs: Implement .bdrv_co_preadv/pwritev interfaces

[Peter Lieven <pl@kamp.de>]

the libnfs read and write functions already take byte arguments
so thats an easy change.

Signed-off-by: Peter Lieven <pl@kamp.de>
---
 block/nfs.c | 40 +++++++++++++++++++---------------------
 1 file changed, 19 insertions(+), 21 deletions(-)

diff --git a/block/nfs.c b/block/nfs.c
index 9f51cc3..386f846 100644
--- a/block/nfs.c
+++ b/block/nfs.c
@@ -133,20 +133,19 @@ nfs_co_generic_cb(int ret, struct nfs_context *nfs, void *data,
     }
 }
 
-static int coroutine_fn nfs_co_readv(BlockDriverState *bs,
-                                     int64_t sector_num, int nb_sectors,
-                                     QEMUIOVector *iov)
+static int coroutine_fn
+nfs_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
+              QEMUIOVector *qiov, int flags)
 {
     NFSClient *client = bs->opaque;
     NFSRPC task;
 
     nfs_co_init_task(client, &task);
-    task.iov = iov;
+    task.iov = qiov;
 
     if (nfs_pread_async(client->context, client->fh,
-                        sector_num * BDRV_SECTOR_SIZE,
-                        nb_sectors * BDRV_SECTOR_SIZE,
-                        nfs_co_generic_cb, &task) != 0) {
+                        offset, bytes, nfs_co_generic_cb,
+                        &task) != 0) {
         return -ENOMEM;
     }
 
@@ -160,16 +159,16 @@ static int coroutine_fn nfs_co_readv(BlockDriverState *bs,
     }
 
     /* zero pad short reads */
-    if (task.ret < iov->size) {
-        qemu_iovec_memset(iov, task.ret, 0, iov->size - task.ret);
+    if (task.ret < qiov->size) {
+        qemu_iovec_memset(qiov, task.ret, 0, qiov->size - task.ret);
     }
 
     return 0;
 }
 
-static int coroutine_fn nfs_co_writev(BlockDriverState *bs,
-                                        int64_t sector_num, int nb_sectors,
-                                        QEMUIOVector *iov)
+static int coroutine_fn
+nfs_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
+               QEMUIOVector *qiov, int flags)
 {
     NFSClient *client = bs->opaque;
     NFSRPC task;
@@ -177,17 +176,16 @@ static int coroutine_fn nfs_co_writev(BlockDriverState *bs,
 
     nfs_co_init_task(client, &task);
 
-    buf = g_try_malloc(nb_sectors * BDRV_SECTOR_SIZE);
-    if (nb_sectors && buf == NULL) {
+    buf = g_try_malloc(bytes);
+    if (bytes && buf == NULL) {
         return -ENOMEM;
     }
 
-    qemu_iovec_to_buf(iov, 0, buf, nb_sectors * BDRV_SECTOR_SIZE);
+    qemu_iovec_to_buf(qiov, 0, buf, bytes);
 
     if (nfs_pwrite_async(client->context, client->fh,
-                         sector_num * BDRV_SECTOR_SIZE,
-                         nb_sectors * BDRV_SECTOR_SIZE,
-                         buf, nfs_co_generic_cb, &task) != 0) {
+                         offset, bytes, buf,
+                         nfs_co_generic_cb, &task) != 0) {
         g_free(buf);
         return -ENOMEM;
     }
@@ -199,7 +197,7 @@ static int coroutine_fn nfs_co_writev(BlockDriverState *bs,
 
     g_free(buf);
 
-    if (task.ret != nb_sectors * BDRV_SECTOR_SIZE) {
+    if (task.ret != bytes) {
         return task.ret < 0 ? task.ret : -EIO;
     }
 
@@ -547,8 +545,8 @@ static BlockDriver bdrv_nfs = {
     .bdrv_create                    = nfs_file_create,
     .bdrv_reopen_prepare            = nfs_reopen_prepare,
 
-    .bdrv_co_readv                  = nfs_co_readv,
-    .bdrv_co_writev                 = nfs_co_writev,
+    .bdrv_co_preadv                 = nfs_co_preadv,
+    .bdrv_co_pwritev                = nfs_co_pwritev,
     .bdrv_co_flush_to_disk          = nfs_co_flush,
 
     .bdrv_detach_aio_context        = nfs_detach_aio_context,
-- 
1.9.1