[PATCH 09/16] 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>
---

 hw/9pfs/9p-util.h |  6 +++-
 hw/9pfs/9p.c      | 90 ++++++++++++++++++++++++++++++++++++++++++-----
 2 files changed, 86 insertions(+), 10 deletions(-)

diff --git a/hw/9pfs/9p-util.h b/hw/9pfs/9p-util.h
index 82b2d0c3e4..3d154e9103 100644
--- a/hw/9pfs/9p-util.h
+++ b/hw/9pfs/9p-util.h
@@ -53,8 +53,10 @@ static inline uint64_t makedev_dotl(uint32_t dev_major, uint32_t dev_minor)
  */
 static inline uint64_t host_dev_to_dotl_dev(dev_t dev)
 {
-#ifdef CONFIG_LINUX
+#if defined(CONFIG_LINUX)
     return dev;
+#elif defined(CONFIG_WIN32)
+    return 0;
 #else
     return makedev_dotl(major(dev), minor(dev));
 #endif
@@ -260,7 +262,9 @@ static inline struct dirent *qemu_dirent_dup(struct dirent *dent)
 #if defined CONFIG_DARWIN && defined CONFIG_PTHREAD_FCHDIR_NP
 int pthread_fchdir_np(int fd) __attribute__((weak_import));
 #endif
+#ifndef CONFIG_WIN32
 int qemu_mknodat(P9_FILE_ID dirfd, const char *filename, mode_t mode,
                  dev_t dev);
+#endif
 
 #endif
diff --git a/hw/9pfs/9p.c b/hw/9pfs/9p.c
index 6c4af86240..771aab34ac 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
+#ifdef CONFIG_LINUX
         { 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
+#ifdef CONFIG_LINUX
     /*
      * Ignore direct disk access hint until the server supports it.
      */
@@ -986,9 +1000,11 @@ static int stat_to_qid(V9fsPDU *pdu, const struct stat *stbuf, V9fsQID *qidp)
     if (S_ISDIR(stbuf->st_mode)) {
         qidp->type |= P9_QID_TYPE_DIR;
     }
+#ifndef CONFIG_WIN32
     if (S_ISLNK(stbuf->st_mode)) {
         qidp->type |= P9_QID_TYPE_SYMLINK;
     }
+#endif
 
     return 0;
 }
@@ -1097,6 +1113,7 @@ static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension)
         ret |= S_IFDIR;
     }
 
+#ifndef CONFIG_WIN32
     if (mode & P9_STAT_MODE_SYMLINK) {
         ret |= S_IFLNK;
     }
@@ -1106,6 +1123,7 @@ static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension)
     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;
@@ -1118,6 +1136,7 @@ static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension)
         ret |= S_IFREG;
     }
 
+#ifndef CONFIG_WIN32
     if (mode & P9_STAT_MODE_SETUID) {
         ret |= S_ISUID;
     }
@@ -1127,6 +1146,7 @@ static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension)
     if (mode & P9_STAT_MODE_SETVTX) {
         ret |= S_ISVTX;
     }
+#endif
 
     return ret;
 }
@@ -1182,6 +1202,7 @@ static uint32_t stat_to_v9mode(const struct stat *stbuf)
         mode |= P9_STAT_MODE_DIR;
     }
 
+#ifndef CONFIG_WIN32
     if (S_ISLNK(stbuf->st_mode)) {
         mode |= P9_STAT_MODE_SYMLINK;
     }
@@ -1193,11 +1214,13 @@ 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;
     }
 
+#ifndef CONFIG_WIN32
     if (stbuf->st_mode & S_ISUID) {
         mode |= P9_STAT_MODE_SETUID;
     }
@@ -1209,6 +1232,7 @@ static uint32_t stat_to_v9mode(const struct stat *stbuf)
     if (stbuf->st_mode & S_ISVTX) {
         mode |= P9_STAT_MODE_SETVTX;
     }
+#endif
 
     return mode;
 }
@@ -1247,9 +1271,17 @@ static int coroutine_fn stat_to_v9stat(V9fsPDU *pdu, V9fsPath *path,
             return err;
         }
     } else if (v9stat->mode & P9_STAT_MODE_DEVICE) {
+        unsigned maj, min;
+
+#ifndef CONFIG_WIN32
+        maj = major(stbuf->st_rdev);
+        min = minor(stbuf->st_rdev);
+#else
+        maj = min = 0;
+#endif
         v9fs_string_sprintf(&v9stat->extension, "%c %u %u",
                 S_ISCHR(stbuf->st_mode) ? 'c' : 'b',
-                major(stbuf->st_rdev), minor(stbuf->st_rdev));
+                maj, min);
     } else if (S_ISDIR(stbuf->st_mode) || S_ISREG(stbuf->st_mode)) {
         v9fs_string_sprintf(&v9stat->extension, "%s %lu",
                 "HARDLINKCOUNT", (unsigned long)stbuf->st_nlink);
@@ -1317,7 +1349,14 @@ static int32_t blksize_to_iounit(const V9fsPDU *pdu, int32_t blksize)
 
 static int32_t stat_to_iounit(const V9fsPDU *pdu, const struct stat *stbuf)
 {
-    return blksize_to_iounit(pdu, stbuf->st_blksize);
+    int32_t blksize;
+
+#ifndef CONFIG_WIN32
+    blksize = stbuf->st_blksize);
+#else
+    blksize = 0;
+#endif
+    return blksize_to_iounit(pdu, blksize);
 }
 
 static int stat_to_v9stat_dotl(V9fsPDU *pdu, const struct stat *stbuf,
@@ -1332,7 +1371,11 @@ static int stat_to_v9stat_dotl(V9fsPDU *pdu, const struct stat *stbuf,
     v9lstat->st_rdev = host_dev_to_dotl_dev(stbuf->st_rdev);
     v9lstat->st_size = stbuf->st_size;
     v9lstat->st_blksize = stat_to_iounit(pdu, stbuf);
+#ifndef CONFIG_WIN32
     v9lstat->st_blocks = stbuf->st_blocks;
+#else
+    v9lstat->st_blocks = 0;
+#endif
     v9lstat->st_atime_sec = stbuf->st_atime;
     v9lstat->st_mtime_sec = stbuf->st_mtime;
     v9lstat->st_ctime_sec = stbuf->st_ctime;
@@ -1340,7 +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;
@@ -2471,6 +2515,7 @@ 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
@@ -2540,10 +2585,13 @@ 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);
 
@@ -2873,8 +2921,12 @@ static void coroutine_fn v9fs_create(void *opaque)
         }
 
         nmode |= perm & 0777;
+#ifndef CONFIG_WIN32
         err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1,
                             makedev(major, minor), nmode, &stbuf);
+#else
+        err = -ENOTSUP;
+#endif
         if (err < 0) {
             goto out;
         }
@@ -2899,8 +2951,12 @@ 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;
         }
@@ -3634,7 +3690,7 @@ out_nofid:
 
 static void coroutine_fn v9fs_mknod(void *opaque)
 {
-
+#ifndef CONFIG_WIN32
     int mode;
     gid_t gid;
     int32_t fid;
@@ -3691,6 +3747,10 @@ out:
 out_nofid:
     pdu_complete(pdu, err);
     v9fs_string_free(&name);
+#else
+    V9fsPDU *pdu = opaque;
+    pdu_complete(pdu, -1);
+#endif
 }
 
 /*
@@ -3963,7 +4023,7 @@ 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.
@@ -3980,6 +4040,7 @@ out_nofid:
 
 static void coroutine_fn v9fs_xattrcreate(void *opaque)
 {
+#ifndef CONFIG_WIN32
     int flags, rflags = 0;
     int32_t fid;
     uint64_t size;
@@ -4041,10 +4102,15 @@ out_put_fid:
 out_nofid:
     pdu_complete(pdu, err);
     v9fs_string_free(&name);
+#else
+    V9fsPDU *pdu = opaque;
+    pdu_complete(pdu, -1);
+#endif
 }
 
 static void coroutine_fn v9fs_readlink(void *opaque)
 {
+#ifndef CONFIG_WIN32
     V9fsPDU *pdu = opaque;
     size_t offset = 7;
     V9fsString target;
@@ -4080,6 +4146,10 @@ out:
     put_fid(pdu, fidp);
 out_nofid:
     pdu_complete(pdu, err);
+#else
+    V9fsPDU *pdu = opaque;
+    pdu_complete(pdu, -1);
+#endif
 }
 
 static CoroutineEntry *pdu_co_handlers[] = {
@@ -4341,6 +4411,7 @@ void v9fs_reset(V9fsState *s)
 
 static void __attribute__((__constructor__)) v9fs_set_fd_limit(void)
 {
+#ifndef CONFIG_WIN32
     struct rlimit rlim;
     if (getrlimit(RLIMIT_NOFILE, &rlim) < 0) {
         error_report("Failed to get the resource limit");
@@ -4348,4 +4419,5 @@ static void __attribute__((__constructor__)) v9fs_set_fd_limit(void)
     }
     open_fd_hw = rlim.rlim_cur - MIN(400, rlim.rlim_cur / 3);
     open_fd_rc = rlim.rlim_cur / 2;
+#endif
 }
-- 
2.25.1