[PATCH v2 12/19] hw/9pfs: Disable unsupported flags and features for Windows

[Bin Meng <bin.meng@windriver.com>]

From: Guohuai Shi <guohuai.shi@windriver.com>

Some flags and features are not supported on Windows, like mknod,
readlink, file mode, etc. Update the codes for Windows.

Signed-off-by: Guohuai Shi <guohuai.shi@windriver.com>
Signed-off-by: Bin Meng <bin.meng@windriver.com>

---

Changes in v2:
- Use precise platform check in ifdefs to avoid automatically
  opting-out other future platforms unintentionally

 hw/9pfs/9p.c | 45 ++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 38 insertions(+), 7 deletions(-)

diff --git a/hw/9pfs/9p.c b/hw/9pfs/9p.c
index 169578cc1d..0b5e1fa8d2 100644
--- a/hw/9pfs/9p.c
+++ b/hw/9pfs/9p.c
@@ -39,6 +39,11 @@
 #include "qemu/xxhash.h"
 #include <math.h>
 
+#ifdef CONFIG_WIN32
+#define UTIME_NOW   ((1l << 30) - 1l)
+#define UTIME_OMIT  ((1l << 30) - 2l)
+#endif
+
 int open_fd_hw;
 int total_open_fd;
 static int open_fd_rc;
@@ -132,13 +137,17 @@ static int dotl_to_open_flags(int flags)
     DotlOpenflagMap dotl_oflag_map[] = {
         { P9_DOTL_CREATE, O_CREAT },
         { P9_DOTL_EXCL, O_EXCL },
+#ifndef CONFIG_WIN32
         { P9_DOTL_NOCTTY , O_NOCTTY },
+#endif
         { P9_DOTL_TRUNC, O_TRUNC },
         { P9_DOTL_APPEND, O_APPEND },
+#ifndef CONFIG_WIN32
         { P9_DOTL_NONBLOCK, O_NONBLOCK } ,
         { P9_DOTL_DSYNC, O_DSYNC },
         { P9_DOTL_FASYNC, FASYNC },
-#ifndef CONFIG_DARWIN
+#endif
+#if !defined(CONFIG_DARWIN) && !defined(CONFIG_WIN32)
         { P9_DOTL_NOATIME, O_NOATIME },
         /*
          *  On Darwin, we could map to F_NOCACHE, which is
@@ -151,8 +160,10 @@ static int dotl_to_open_flags(int flags)
 #endif
         { P9_DOTL_LARGEFILE, O_LARGEFILE },
         { P9_DOTL_DIRECTORY, O_DIRECTORY },
+#ifndef CONFIG_WIN32
         { P9_DOTL_NOFOLLOW, O_NOFOLLOW },
         { P9_DOTL_SYNC, O_SYNC },
+#endif
     };
 
     for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
@@ -179,8 +190,11 @@ static int get_dotl_openflags(V9fsState *s, int oflags)
      * Filter the client open flags
      */
     flags = dotl_to_open_flags(oflags);
-    flags &= ~(O_NOCTTY | O_ASYNC | O_CREAT);
-#ifndef CONFIG_DARWIN
+    flags &= ~(O_CREAT);
+#ifndef CONFIG_WIN32
+    flags &= ~(O_NOCTTY | O_ASYNC);
+#endif
+#if !defined(CONFIG_DARWIN) && !defined(CONFIG_WIN32)
     /*
      * Ignore direct disk access hint until the server supports it.
      */
@@ -1117,12 +1131,14 @@ static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension)
     if (mode & P9_STAT_MODE_SYMLINK) {
         ret |= S_IFLNK;
     }
+#ifndef CONFIG_WIN32
     if (mode & P9_STAT_MODE_SOCKET) {
         ret |= S_IFSOCK;
     }
     if (mode & P9_STAT_MODE_NAMED_PIPE) {
         ret |= S_IFIFO;
     }
+#endif
     if (mode & P9_STAT_MODE_DEVICE) {
         if (extension->size && extension->data[0] == 'c') {
             ret |= S_IFCHR;
@@ -1203,6 +1219,7 @@ static uint32_t stat_to_v9mode(const struct stat *stbuf)
         mode |= P9_STAT_MODE_SYMLINK;
     }
 
+#ifndef CONFIG_WIN32
     if (S_ISSOCK(stbuf->st_mode)) {
         mode |= P9_STAT_MODE_SOCKET;
     }
@@ -1210,6 +1227,7 @@ static uint32_t stat_to_v9mode(const struct stat *stbuf)
     if (S_ISFIFO(stbuf->st_mode)) {
         mode |= P9_STAT_MODE_NAMED_PIPE;
     }
+#endif
 
     if (S_ISBLK(stbuf->st_mode) || S_ISCHR(stbuf->st_mode)) {
         mode |= P9_STAT_MODE_DEVICE;
@@ -1365,7 +1383,8 @@ static int stat_to_v9stat_dotl(V9fsPDU *pdu, const struct stat *stbuf,
     v9lstat->st_atime_nsec = stbuf->st_atimespec.tv_nsec;
     v9lstat->st_mtime_nsec = stbuf->st_mtimespec.tv_nsec;
     v9lstat->st_ctime_nsec = stbuf->st_ctimespec.tv_nsec;
-#else
+#endif
+#ifdef CONFIG_LINUX
     v9lstat->st_atime_nsec = stbuf->st_atim.tv_nsec;
     v9lstat->st_mtime_nsec = stbuf->st_mtim.tv_nsec;
     v9lstat->st_ctime_nsec = stbuf->st_ctim.tv_nsec;
@@ -2488,6 +2507,7 @@ static int coroutine_fn v9fs_do_readdir(V9fsPDU *pdu, V9fsFidState *fidp,
     struct dirent *dent;
     struct stat *st;
     struct V9fsDirEnt *entries = NULL;
+    unsigned char d_type = 0;
 
     /*
      * inode remapping requires the device id, which in turn might be
@@ -2549,10 +2569,13 @@ static int coroutine_fn v9fs_do_readdir(V9fsPDU *pdu, V9fsFidState *fidp,
         v9fs_string_init(&name);
         v9fs_string_sprintf(&name, "%s", dent->d_name);
 
+#ifndef CONFIG_WIN32
+        d_type = dent->d_type;
+#endif
         /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */
         len = pdu_marshal(pdu, 11 + count, "Qqbs",
                           &qid, off,
-                          dent->d_type, &name);
+                          d_type, &name);
 
         v9fs_string_free(&name);
 
@@ -2908,8 +2931,12 @@ static void coroutine_fn v9fs_create(void *opaque)
         v9fs_path_copy(&fidp->path, &path);
         v9fs_path_unlock(s);
     } else if (perm & P9_STAT_MODE_SOCKET) {
+#ifndef CONFIG_WIN32
         err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1,
                             0, S_IFSOCK | (perm & 0777), &stbuf);
+#else
+        err = -ENOTSUP;
+#endif
         if (err < 0) {
             goto out;
         }
@@ -3979,7 +4006,7 @@ out_nofid:
 #if defined(CONFIG_LINUX)
 /* Currently, only Linux has XATTR_SIZE_MAX */
 #define P9_XATTR_SIZE_MAX XATTR_SIZE_MAX
-#elif defined(CONFIG_DARWIN)
+#elif defined(CONFIG_DARWIN) || defined(CONFIG_WIN32)
 /*
  * Darwin doesn't seem to define a maximum xattr size in its user
  * space header, so manually configure it across platforms as 64k.
@@ -3996,6 +4023,8 @@ out_nofid:
 
 static void coroutine_fn v9fs_xattrcreate(void *opaque)
 {
+    V9fsPDU *pdu = opaque;
+#ifndef CONFIG_WIN32
     int flags, rflags = 0;
     int32_t fid;
     uint64_t size;
@@ -4004,7 +4033,6 @@ static void coroutine_fn v9fs_xattrcreate(void *opaque)
     size_t offset = 7;
     V9fsFidState *file_fidp;
     V9fsFidState *xattr_fidp;
-    V9fsPDU *pdu = opaque;
 
     v9fs_string_init(&name);
     err = pdu_unmarshal(pdu, offset, "dsqd", &fid, &name, &size, &flags);
@@ -4057,6 +4085,9 @@ out_put_fid:
 out_nofid:
     pdu_complete(pdu, err);
     v9fs_string_free(&name);
+#else
+    pdu_complete(pdu, -1);
+#endif
 }
 
 static void coroutine_fn v9fs_readlink(void *opaque)
-- 
2.25.1