hw/9pfs: Use the correct file descriptor in Fsdriver Callback

Fsdriver callback that operate on file descriptor need to
differentiate between directory fd and file fd.

Based on the original patch from Sassan Panahinejad <sassan@sassan.me.uk>

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>

fsdev/file-op-9p.h

@@ -112,10 +112,10 @@ typedef struct FileOperations
     ssize_t (*pwritev)(FsContext *, V9fsFidOpenState *,
                        const struct iovec *, int, off_t);
     int (*mkdir)(FsContext *, V9fsPath *, const char *, FsCred *);
-    int (*fstat)(FsContext *, V9fsFidOpenState *, struct stat *);
+    int (*fstat)(FsContext *, int, V9fsFidOpenState *, struct stat *);
     int (*rename)(FsContext *, const char *, const char *);
     int (*truncate)(FsContext *, V9fsPath *, off_t);
-    int (*fsync)(FsContext *, V9fsFidOpenState *, int);
+    int (*fsync)(FsContext *, int, V9fsFidOpenState *, int);
     int (*statfs)(FsContext *s, V9fsPath *path, struct statfs *stbuf);
     ssize_t (*lgetxattr)(FsContext *, V9fsPath *,
                          const char *, void *, size_t);

hw/9pfs/cofile.c

@@ -71,7 +71,7 @@ int v9fs_co_fstat(V9fsPDU *pdu, V9fsFidState *fidp, struct stat *stbuf)
     }
     v9fs_co_run_in_worker(
         {
-            err = s->ops->fstat(&s->ctx, &fidp->fs, stbuf);
+            err = s->ops->fstat(&s->ctx, fidp->fid_type, &fidp->fs, stbuf);
             if (err < 0) {
                 err = -errno;
             }
@@ -192,7 +192,7 @@ int v9fs_co_fsync(V9fsPDU *pdu, V9fsFidState *fidp, int datasync)
     }
     v9fs_co_run_in_worker(
         {
-            err = s->ops->fsync(&s->ctx, &fidp->fs, datasync);
+            err = s->ops->fsync(&s->ctx, fidp->fid_type, &fidp->fs, datasync);
             if (err < 0) {
                 err = -errno;
             }

hw/9pfs/virtio-9p-handle.c

@@ -255,10 +255,17 @@ static int handle_mkdir(FsContext *fs_ctx, V9fsPath *dir_path,
     return ret;
 }
 
-static int handle_fstat(FsContext *fs_ctx, V9fsFidOpenState *fs,
-                        struct stat *stbuf)
+static int handle_fstat(FsContext *fs_ctx, int fid_type,
+                        V9fsFidOpenState *fs, struct stat *stbuf)
 {
-    return fstat(fs->fd, stbuf);
+    int fd;
+
+    if (fid_type == P9_FID_DIR) {
+        fd = dirfd(fs->dir);
+    } else {
+        fd = fs->fd;
+    }
+    return fstat(fd, stbuf);
 }
 
 static int handle_open2(FsContext *fs_ctx, V9fsPath *dir_path, const char *name,
@@ -395,12 +402,21 @@ static int handle_remove(FsContext *ctx, const char *path)
     return -1;
 }
 
-static int handle_fsync(FsContext *ctx, V9fsFidOpenState *fs, int datasync)
+static int handle_fsync(FsContext *ctx, int fid_type,
+                        V9fsFidOpenState *fs, int datasync)
 {
+    int fd;
+
+    if (fid_type == P9_FID_DIR) {
+        fd = dirfd(fs->dir);
+    } else {
+        fd = fs->fd;
+    }
+
     if (datasync) {
-        return qemu_fdatasync(fs->fd);
+        return qemu_fdatasync(fd);
     } else {
-        return fsync(fs->fd);
+        return fsync(fd);
     }
 }
 

hw/9pfs/virtio-9p-local.c

@@ -366,11 +366,18 @@ static int local_mkdir(FsContext *fs_ctx, V9fsPath *dir_path,
     return err;
 }
 
-static int local_fstat(FsContext *fs_ctx,
+static int local_fstat(FsContext *fs_ctx, int fid_type,
                        V9fsFidOpenState *fs, struct stat *stbuf)
 {
-    int err;
-    err = fstat(fs->fd, stbuf);
+    int err, fd;
+
+    if (fid_type == P9_FID_DIR) {
+        fd = dirfd(fs->dir);
+    } else {
+        fd = fs->fd;
+    }
+
+    err = fstat(fd, stbuf);
     if (err) {
         return err;
     }
@@ -381,19 +388,19 @@ static int local_fstat(FsContext *fs_ctx,
         mode_t tmp_mode;
         dev_t tmp_dev;
 
-        if (fgetxattr(fs->fd, "user.virtfs.uid",
+        if (fgetxattr(fd, "user.virtfs.uid",
                       &tmp_uid, sizeof(uid_t)) > 0) {
             stbuf->st_uid = tmp_uid;
         }
-        if (fgetxattr(fs->fd, "user.virtfs.gid",
+        if (fgetxattr(fd, "user.virtfs.gid",
                       &tmp_gid, sizeof(gid_t)) > 0) {
             stbuf->st_gid = tmp_gid;
         }
-        if (fgetxattr(fs->fd, "user.virtfs.mode",
+        if (fgetxattr(fd, "user.virtfs.mode",
                       &tmp_mode, sizeof(mode_t)) > 0) {
             stbuf->st_mode = tmp_mode;
         }
-        if (fgetxattr(fs->fd, "user.virtfs.rdev",
+        if (fgetxattr(fd, "user.virtfs.rdev",
                       &tmp_dev, sizeof(dev_t)) > 0) {
                 stbuf->st_rdev = tmp_dev;
         }
@@ -592,12 +599,21 @@ static int local_remove(FsContext *ctx, const char *path)
     return remove(rpath(ctx, path, buffer));
 }
 
-static int local_fsync(FsContext *ctx, V9fsFidOpenState *fs, int datasync)
+static int local_fsync(FsContext *ctx, int fid_type,
+                       V9fsFidOpenState *fs, int datasync)
 {
+    int fd;
+
+    if (fid_type == P9_FID_DIR) {
+        fd = dirfd(fs->dir);
+    } else {
+        fd = fs->fd;
+    }
+
     if (datasync) {
-        return qemu_fdatasync(fs->fd);
+        return qemu_fdatasync(fd);
     } else {
-        return fsync(fs->fd);
+        return fsync(fd);
     }
 }
 

hw/9pfs/virtio-9p-synth.c

@@ -166,7 +166,7 @@ static int v9fs_synth_lstat(FsContext *fs_ctx,
     return 0;
 }
 
-static int v9fs_synth_fstat(FsContext *fs_ctx,
+static int v9fs_synth_fstat(FsContext *fs_ctx, int fid_type,
                             V9fsFidOpenState *fs, struct stat *stbuf)
 {
     V9fsSynthOpenState *synth_open = fs->private;
@@ -414,7 +414,8 @@ static int v9fs_synth_remove(FsContext *ctx, const char *path)
     return -1;
 }
 
-static int v9fs_synth_fsync(FsContext *ctx, V9fsFidOpenState *fs, int datasync)
+static int v9fs_synth_fsync(FsContext *ctx, int fid_type,
+                            V9fsFidOpenState *fs, int datasync)
 {
     errno = ENOSYS;
     return 0;