[PATCH v10 25/26] block: Fixes nfs compiling error on msys2/mingw

[Yonggang Luo <luoyonggang@gmail.com>]

These compiling errors are fixed:
../block/nfs.c:27:10: fatal error: poll.h: No such file or directory
   27 | #include <poll.h>
      |          ^~~~~~~~
compilation terminated.

../block/nfs.c:63:5: error: unknown type name 'blkcnt_t'
   63 |     blkcnt_t st_blocks;
      |     ^~~~~~~~
../block/nfs.c: In function 'nfs_client_open':
../block/nfs.c:550:27: error: 'struct _stat64' has no member named 'st_blocks'
  550 |     client->st_blocks = st.st_blocks;
      |                           ^
../block/nfs.c: In function 'nfs_get_allocated_file_size':
../block/nfs.c:751:41: error: 'struct _stat64' has no member named 'st_blocks'
  751 |     return (task.ret < 0 ? task.ret : st.st_blocks * 512);
      |                                         ^
../block/nfs.c: In function 'nfs_reopen_prepare':
../block/nfs.c:805:31: error: 'struct _stat64' has no member named 'st_blocks'
  805 |         client->st_blocks = st.st_blocks;
      |                               ^
../block/nfs.c: In function 'nfs_get_allocated_file_size':
../block/nfs.c:752:1: error: control reaches end of non-void function [-Werror=return-type]
  752 | }
      | ^

On msys2/mingw, there is no st_blocks in struct _stat64 yet, we disable the usage of it
on msys2/mingw, and create a typedef long long blkcnt_t; for further implementation

Signed-off-by: Yonggang Luo <luoyonggang@gmail.com>
---
 block/nfs.c | 37 ++++++++++++++++++++++++++++++-------
 1 file changed, 30 insertions(+), 7 deletions(-)

diff --git a/block/nfs.c b/block/nfs.c
index 61a249a9fc..5f83dbe407 100644
--- a/block/nfs.c
+++ b/block/nfs.c
@@ -24,7 +24,9 @@
 
 #include "qemu/osdep.h"
 
+#if !defined(_WIN32)
 #include <poll.h>
+#endif
 #include "qemu/config-file.h"
 #include "qemu/error-report.h"
 #include "qapi/error.h"
@@ -51,6 +53,13 @@
 #define QEMU_NFS_MAX_PAGECACHE_SIZE (8388608 / NFS_BLKSIZE)
 #define QEMU_NFS_MAX_DEBUG_LEVEL 2
 
+#if defined(_WIN32)
+#define nfs_stat __stat64
+typedef long long blkcnt_t;
+#else
+#define nfs_stat stat
+#endif
+
 typedef struct NFSClient {
     struct nfs_context *context;
     struct nfsfh *fh;
@@ -70,7 +79,7 @@ typedef struct NFSRPC {
     int ret;
     int complete;
     QEMUIOVector *iov;
-    struct stat *st;
+    struct nfs_stat *st;
     Coroutine *co;
     NFSClient *client;
 } NFSRPC;
@@ -415,11 +424,21 @@ static void nfs_file_close(BlockDriverState *bs)
     nfs_client_close(client);
 }
 
+static blkcnt_t nfs_get_st_blocks(const struct nfs_stat *st)
+{
+#if defined(_WIN32)
+    /* TODO: Not be possible implement on win32 yet */
+    return 0;
+#else
+    return st->st_blocks;
+#endif
+}
+
 static int64_t nfs_client_open(NFSClient *client, BlockdevOptionsNfs *opts,
                                int flags, int open_flags, Error **errp)
 {
     int64_t ret = -EINVAL;
-    struct stat st;
+    struct nfs_stat st;
     char *file = NULL, *strp = NULL;
 
     qemu_mutex_init(&client->mutex);
@@ -545,7 +564,7 @@ static int64_t nfs_client_open(NFSClient *client, BlockdevOptionsNfs *opts,
     }
 
     ret = DIV_ROUND_UP(st.st_size, BDRV_SECTOR_SIZE);
-    client->st_blocks = st.st_blocks;
+    client->st_blocks = nfs_get_st_blocks(&st);
     client->has_zero_init = S_ISREG(st.st_mode);
     *strp = '/';
     goto out;
@@ -706,6 +725,7 @@ static int nfs_has_zero_init(BlockDriverState *bs)
     return client->has_zero_init;
 }
 
+#if !defined(_WIN32)
 /* Called (via nfs_service) with QemuMutex held.  */
 static void
 nfs_get_allocated_file_size_cb(int ret, struct nfs_context *nfs, void *data,
@@ -729,7 +749,7 @@ static int64_t nfs_get_allocated_file_size(BlockDriverState *bs)
 {
     NFSClient *client = bs->opaque;
     NFSRPC task = {0};
-    struct stat st;
+    struct nfs_stat st;
 
     if (bdrv_is_read_only(bs) &&
         !(bs->open_flags & BDRV_O_NOCACHE)) {
@@ -746,8 +766,9 @@ static int64_t nfs_get_allocated_file_size(BlockDriverState *bs)
     nfs_set_events(client);
     BDRV_POLL_WHILE(bs, !task.complete);
 
-    return (task.ret < 0 ? task.ret : st.st_blocks * 512);
+    return (task.ret < 0 ? task.ret : nfs_get_st_blocks(&st) * 512);
 }
+#endif
 
 static int coroutine_fn
 nfs_file_co_truncate(BlockDriverState *bs, int64_t offset, bool exact,
@@ -778,7 +799,7 @@ static int nfs_reopen_prepare(BDRVReopenState *state,
                               BlockReopenQueue *queue, Error **errp)
 {
     NFSClient *client = state->bs->opaque;
-    struct stat st;
+    struct nfs_stat st;
     int ret = 0;
 
     if (state->flags & BDRV_O_RDWR && bdrv_is_read_only(state->bs)) {
@@ -800,7 +821,7 @@ static int nfs_reopen_prepare(BDRVReopenState *state,
                        nfs_get_error(client->context));
             return ret;
         }
-        client->st_blocks = st.st_blocks;
+        client->st_blocks = nfs_get_st_blocks(&st);
     }
 
     return 0;
@@ -869,7 +890,9 @@ static BlockDriver bdrv_nfs = {
     .create_opts                    = &nfs_create_opts,
 
     .bdrv_has_zero_init             = nfs_has_zero_init,
+#if !defined(_WIN32)
     .bdrv_get_allocated_file_size   = nfs_get_allocated_file_size,
+#endif
     .bdrv_co_truncate               = nfs_file_co_truncate,
 
     .bdrv_file_open                 = nfs_file_open,
-- 
2.28.0.windows.1