[Qemu-devel] [PATCH V2 07/12] hw/9pfs: File ownership and others

["M. Mohan Kumar" <mohan@in.ibm.com>]

Add file ownership interfaces like chmod/chown, utime update, rename,
remove and truncating files for proxy FS

Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com>
---
 Makefile                    |    2 +-
 fsdev/virtfs-proxy-helper.c |   66 +++++++++++++++++++++
 hw/9pfs/virtio-9p-proxy.c   |  134 +++++++++++++++++++++++++++++++++++++++----
 hw/9pfs/virtio-9p-proxy.h   |    6 ++
 4 files changed, 195 insertions(+), 13 deletions(-)

diff --git a/Makefile b/Makefile
index 19b481a..378ee4d 100644
--- a/Makefile
+++ b/Makefile
@@ -153,7 +153,7 @@ qemu-img$(EXESUF): qemu-img.o $(tools-obj-y) $(block-obj-y)
 qemu-nbd$(EXESUF): qemu-nbd.o $(tools-obj-y) $(block-obj-y)
 qemu-io$(EXESUF): qemu-io.o cmd.o $(tools-obj-y) $(block-obj-y)
 
-fsdev/virtfs-proxy-helper$(EXESUF): fsdev/virtfs-proxy-helper.o fsdev/virtio-9p-marshal.o
+fsdev/virtfs-proxy-helper$(EXESUF): fsdev/virtfs-proxy-helper.o fsdev/virtio-9p-marshal.o oslib-posix.o
 fsdev/virtfs-proxy-helper$(EXESUF): LIBS += -lcap
 
 qemu-img-cmds.h: $(SRC_PATH)/qemu-img-cmds.hx
diff --git a/fsdev/virtfs-proxy-helper.c b/fsdev/virtfs-proxy-helper.c
index eb33504..ded0ead 100644
--- a/fsdev/virtfs-proxy-helper.c
+++ b/fsdev/virtfs-proxy-helper.c
@@ -495,6 +495,9 @@ static void usage(char *prog)
 
 static int process_requests(int sock)
 {
+    uint64_t offset;
+    int mode, uid, gid;
+    struct timespec spec[2];
     int type, retval = 0;
     V9fsString oldpath, path;
     struct iovec in_iovec, out_iovec;
@@ -535,6 +538,63 @@ static int process_requests(int sock)
         case T_READLINK:
             size = do_readlink(&in_iovec, &out_iovec);
             break;
+        case T_CHMOD:
+            proxy_unmarshal(&in_iovec, 1, HDR_SZ, "sd",
+                            &path, &mode);
+            retval = chmod(path.data, mode);
+            if (retval < 0) {
+                retval = -errno;
+            }
+            v9fs_string_free(&path);
+            break;
+        case T_CHOWN:
+            proxy_unmarshal(&in_iovec, 1, HDR_SZ, "sdd", &path,
+                            &uid, &gid);
+            retval = lchown(path.data, uid, gid);
+            if (retval < 0) {
+                retval = -errno;
+            }
+            v9fs_string_free(&path);
+            break;
+        case T_TRUNCATE:
+            proxy_unmarshal(&in_iovec, 1, HDR_SZ, "sq",
+                            &path, &offset);
+            retval = truncate(path.data, offset);
+            if (retval < 0) {
+                retval = -errno;
+            }
+            v9fs_string_free(&path);
+            break;
+        case T_UTIME:
+            proxy_unmarshal(&in_iovec, 1,
+                           HDR_SZ, "sqqqq", &path,
+                           &spec[0].tv_sec, &spec[0].tv_nsec,
+                           &spec[1].tv_sec, &spec[1].tv_nsec);
+            retval = qemu_utimensat(AT_FDCWD, path.data, spec,
+                            AT_SYMLINK_NOFOLLOW);
+            if (retval < 0) {
+                retval = -errno;
+            }
+            v9fs_string_free(&path);
+            break;
+        case T_RENAME:
+            proxy_unmarshal(&in_iovec, 1,
+                           HDR_SZ, "ss", &oldpath, &path);
+            retval = rename(oldpath.data, path.data);
+            if (retval < 0) {
+                retval = -errno;
+            }
+            v9fs_string_free(&oldpath);
+            v9fs_string_free(&path);
+            break;
+        case T_REMOVE:
+            proxy_unmarshal(&in_iovec, 1, HDR_SZ, "s", &path);
+            retval = remove(path.data);
+            if (retval < 0) {
+                retval = -errno;
+            }
+            v9fs_string_free(&path);
+            break;
         default:
             goto error;
             break;
@@ -550,6 +610,12 @@ static int process_requests(int sock)
         case T_MKDIR:
         case T_SYMLINK:
         case T_LINK:
+        case T_CHMOD:
+        case T_CHOWN:
+        case T_TRUNCATE:
+        case T_UTIME:
+        case T_RENAME:
+        case T_REMOVE:
             send_status(sock, &out_iovec, retval);
             break;
         case T_LSTAT:
diff --git a/hw/9pfs/virtio-9p-proxy.c b/hw/9pfs/virtio-9p-proxy.c
index 090db44..aefdc61 100644
--- a/hw/9pfs/virtio-9p-proxy.c
+++ b/hw/9pfs/virtio-9p-proxy.c
@@ -242,6 +242,8 @@ static int v9fs_request(V9fsProxy *proxy, int type,
     struct iovec *iovec = NULL, *reply = NULL;
     dev_t rdev;
     int size = 0;
+    struct timespec spec[2];
+    uint64_t offset;
 
     qemu_mutex_lock(&proxy->mutex);
 
@@ -339,6 +341,63 @@ static int v9fs_request(V9fsProxy *proxy, int type,
         proxy_marshal(iovec, 1, 0, "dd", header.type, header.size);
         header.size += HDR_SZ;
         break;
+    case T_CHMOD:
+        path = va_arg(ap, V9fsString *);
+        mode = va_arg(ap, int);
+        header.size = proxy_marshal(iovec, 1, HDR_SZ, "sd",
+                                   path, mode);
+        header.type = T_CHMOD;
+        proxy_marshal(iovec, 1, 0, "dd", header.type, header.size);
+        header.size += HDR_SZ;
+        break;
+    case T_CHOWN:
+        path = va_arg(ap, V9fsString *);
+        uid = va_arg(ap, int);
+        gid = va_arg(ap, int);
+        header.size = proxy_marshal(iovec, 1, HDR_SZ, "sdd",
+                                   path, uid, gid);
+        header.type = T_CHOWN;
+        proxy_marshal(iovec, 1, 0, "dd", header.type, header.size);
+        header.size += HDR_SZ;
+        break;
+    case T_TRUNCATE:
+        path = va_arg(ap, V9fsString *);
+        offset = va_arg(ap, uint64_t);
+        header.size = proxy_marshal(iovec, 1, HDR_SZ, "sq",
+                                   path, offset);
+        header.type = T_TRUNCATE;
+        proxy_marshal(iovec, 1, 0, "dd", header.type, header.size);
+        header.size += HDR_SZ;
+        break;
+    case T_UTIME:
+        path = va_arg(ap, V9fsString *);
+        spec[0].tv_sec = va_arg(ap, long);
+        spec[0].tv_nsec = va_arg(ap, long);
+        spec[1].tv_sec = va_arg(ap, long);
+        spec[1].tv_nsec = va_arg(ap, long);
+        header.size = proxy_marshal(iovec, 1, HDR_SZ, "sqqqq",
+                                   path, spec[0].tv_sec, spec[1].tv_nsec,
+                                   spec[1].tv_sec, spec[1].tv_nsec);
+        header.type = T_UTIME;
+        proxy_marshal(iovec, 1, 0, "dd", header.type, header.size);
+        header.size += HDR_SZ;
+        break;
+    case T_RENAME:
+        oldpath = va_arg(ap, V9fsString *);
+        path = va_arg(ap, V9fsString *);
+        header.size = proxy_marshal(iovec, 1, HDR_SZ, "ss",
+                                   oldpath, path);
+        header.type = T_RENAME;
+        proxy_marshal(iovec, 1, 0, "dd", header.type, header.size);
+        header.size += HDR_SZ;
+        break;
+    case T_REMOVE:
+        path = va_arg(ap, V9fsString *);
+        header.size = proxy_marshal(iovec, 1, HDR_SZ, "s", path);
+        header.type = T_REMOVE;
+        proxy_marshal(iovec, 1, 0, "dd", header.type, header.size);
+        header.size += HDR_SZ;
+        break;
     default:
         error_report("Invalid type %d\n", type);
         va_end(ap);
@@ -368,6 +427,12 @@ static int v9fs_request(V9fsProxy *proxy, int type,
     case T_MKDIR:
     case T_SYMLINK:
     case T_LINK:
+    case T_CHMOD:
+    case T_CHOWN:
+    case T_RENAME:
+    case T_TRUNCATE:
+    case T_UTIME:
+    case T_REMOVE:
         retval = v9fs_receive_status(proxy, &sock_error, reply);
         if (sock_error) {
             goto close_error;
@@ -530,8 +595,13 @@ static ssize_t proxy_pwritev(FsContext *ctx, V9fsFidOpenState *fs,
 
 static int proxy_chmod(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
 {
-    errno = EOPNOTSUPP;
-    return -1;
+    int retval;
+    retval = v9fs_request(fs_ctx->private, T_CHMOD, NULL, "sd",
+                          fs_path, credp->fc_mode);
+    if (retval < 0) {
+        errno = -retval;
+    }
+    return retval;
 }
 
 static int proxy_mknod(FsContext *fs_ctx, V9fsPath *dir_path,
@@ -644,34 +714,74 @@ static int proxy_link(FsContext *ctx, V9fsPath *oldpath,
 
 static int proxy_truncate(FsContext *ctx, V9fsPath *fs_path, off_t size)
 {
-    errno = EOPNOTSUPP;
-    return -1;
+    int retval;
+
+    retval = v9fs_request(ctx->private, T_TRUNCATE, NULL, "sq", fs_path, size);
+    if (retval < 0) {
+        errno = -retval;
+        return -1;
+    }
+    return 0;
 }
 
 static int proxy_rename(FsContext *ctx, const char *oldpath,
                         const char *newpath)
 {
-    errno = EOPNOTSUPP;
-    return -1;
+    int retval;
+    V9fsString oldname, newname;
+
+    v9fs_string_init(&oldname);
+    v9fs_string_init(&newname);
+
+    v9fs_string_sprintf(&oldname, "%s", oldpath);
+    v9fs_string_sprintf(&newname, "%s", newpath);
+    retval = v9fs_request(ctx->private, T_RENAME, NULL, "ss",
+                          &oldname, &newname);
+    v9fs_string_free(&oldname);
+    v9fs_string_free(&newname);
+    if (retval < 0) {
+        errno = -retval;
+    }
+    return retval;
 }
 
 static int proxy_chown(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
 {
-    errno = EOPNOTSUPP;
-    return -1;
+    int retval;
+    retval = v9fs_request(fs_ctx->private, T_CHOWN, NULL, "sdd",
+                          fs_path, credp->fc_uid, credp->fc_gid);
+    if (retval < 0) {
+        errno = -retval;
+    }
+    return retval;
 }
 
 static int proxy_utimensat(FsContext *s, V9fsPath *fs_path,
                            const struct timespec *buf)
 {
-    errno = EOPNOTSUPP;
-    return -1;
+    int retval;
+    retval = v9fs_request(s->private, T_UTIME, NULL, "sqqqq",
+                          fs_path,
+                          buf[0].tv_sec, buf[0].tv_nsec,
+                          buf[1].tv_sec, buf[1].tv_nsec);
+    if (retval < 0) {
+        errno = -retval;
+    }
+    return retval;
 }
 
 static int proxy_remove(FsContext *ctx, const char *path)
 {
-    errno = EOPNOTSUPP;
-    return -1;
+    int retval;
+    V9fsString name;
+    v9fs_string_init(&name);
+    v9fs_string_sprintf(&name, "%s", path);
+    retval = v9fs_request(ctx->private, T_REMOVE, NULL, "s", &name);
+    v9fs_string_free(&name);
+    if (retval < 0) {
+        errno = -retval;
+    }
+    return retval;
 }
 
 static int proxy_fsync(FsContext *ctx, V9fsFidOpenState *fs, int datasync)
diff --git a/hw/9pfs/virtio-9p-proxy.h b/hw/9pfs/virtio-9p-proxy.h
index 578ca19..ef8a0f3 100644
--- a/hw/9pfs/virtio-9p-proxy.h
+++ b/hw/9pfs/virtio-9p-proxy.h
@@ -33,6 +33,12 @@ enum {
     T_LSTAT,
     T_READLINK,
     T_STATFS,
+    T_CHMOD,
+    T_CHOWN,
+    T_TRUNCATE,
+    T_UTIME,
+    T_RENAME,
+    T_REMOVE,
 };
 
 typedef struct {
-- 
1.7.6