1295 lines
35 KiB
C
1295 lines
35 KiB
C
/*
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* Virtio 9p Posix callback
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*
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* Copyright IBM, Corp. 2010
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#include "hw/virtio/virtio.h"
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#include "virtio-9p.h"
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#include "virtio-9p-xattr.h"
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#include "fsdev/qemu-fsdev.h" /* local_ops */
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#include <arpa/inet.h>
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#include <pwd.h>
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#include <grp.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include "qemu/xattr.h"
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#include <libgen.h>
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#include <linux/fs.h>
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#ifdef CONFIG_LINUX_MAGIC_H
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#include <linux/magic.h>
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#endif
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#include <sys/ioctl.h>
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#ifndef XFS_SUPER_MAGIC
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#define XFS_SUPER_MAGIC 0x58465342
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#endif
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#ifndef EXT2_SUPER_MAGIC
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#define EXT2_SUPER_MAGIC 0xEF53
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#endif
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#ifndef REISERFS_SUPER_MAGIC
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#define REISERFS_SUPER_MAGIC 0x52654973
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#endif
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#ifndef BTRFS_SUPER_MAGIC
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#define BTRFS_SUPER_MAGIC 0x9123683E
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#endif
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#define VIRTFS_META_DIR ".virtfs_metadata"
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static char *local_mapped_attr_path(FsContext *ctx, const char *path)
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{
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char *dir_name;
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char *tmp_path = g_strdup(path);
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char *base_name = basename(tmp_path);
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char *buffer;
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/* NULL terminate the directory */
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dir_name = tmp_path;
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*(base_name - 1) = '\0';
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buffer = g_strdup_printf("%s/%s/%s/%s",
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ctx->fs_root, dir_name, VIRTFS_META_DIR, base_name);
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g_free(tmp_path);
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return buffer;
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}
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static FILE *local_fopen(const char *path, const char *mode)
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{
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int fd, o_mode = 0;
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FILE *fp;
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int flags = O_NOFOLLOW;
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/*
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* only supports two modes
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*/
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if (mode[0] == 'r') {
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flags |= O_RDONLY;
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} else if (mode[0] == 'w') {
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flags |= O_WRONLY | O_TRUNC | O_CREAT;
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o_mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH;
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} else {
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return NULL;
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}
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fd = open(path, flags, o_mode);
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if (fd == -1) {
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return NULL;
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}
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fp = fdopen(fd, mode);
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if (!fp) {
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close(fd);
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}
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return fp;
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}
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#define ATTR_MAX 100
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static void local_mapped_file_attr(FsContext *ctx, const char *path,
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struct stat *stbuf)
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{
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FILE *fp;
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char buf[ATTR_MAX];
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char *attr_path;
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attr_path = local_mapped_attr_path(ctx, path);
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fp = local_fopen(attr_path, "r");
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g_free(attr_path);
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if (!fp) {
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return;
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}
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memset(buf, 0, ATTR_MAX);
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while (fgets(buf, ATTR_MAX, fp)) {
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if (!strncmp(buf, "virtfs.uid", 10)) {
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stbuf->st_uid = atoi(buf+11);
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} else if (!strncmp(buf, "virtfs.gid", 10)) {
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stbuf->st_gid = atoi(buf+11);
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} else if (!strncmp(buf, "virtfs.mode", 11)) {
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stbuf->st_mode = atoi(buf+12);
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} else if (!strncmp(buf, "virtfs.rdev", 11)) {
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stbuf->st_rdev = atoi(buf+12);
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}
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memset(buf, 0, ATTR_MAX);
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}
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fclose(fp);
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}
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static int local_lstat(FsContext *fs_ctx, V9fsPath *fs_path, struct stat *stbuf)
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{
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int err;
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char *buffer;
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char *path = fs_path->data;
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buffer = rpath(fs_ctx, path);
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err = lstat(buffer, stbuf);
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if (err) {
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goto err_out;
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}
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if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
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/* Actual credentials are part of extended attrs */
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uid_t tmp_uid;
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gid_t tmp_gid;
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mode_t tmp_mode;
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dev_t tmp_dev;
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if (getxattr(buffer, "user.virtfs.uid", &tmp_uid, sizeof(uid_t)) > 0) {
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stbuf->st_uid = le32_to_cpu(tmp_uid);
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}
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if (getxattr(buffer, "user.virtfs.gid", &tmp_gid, sizeof(gid_t)) > 0) {
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stbuf->st_gid = le32_to_cpu(tmp_gid);
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}
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if (getxattr(buffer, "user.virtfs.mode",
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&tmp_mode, sizeof(mode_t)) > 0) {
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stbuf->st_mode = le32_to_cpu(tmp_mode);
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}
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if (getxattr(buffer, "user.virtfs.rdev", &tmp_dev, sizeof(dev_t)) > 0) {
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stbuf->st_rdev = le64_to_cpu(tmp_dev);
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}
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} else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
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local_mapped_file_attr(fs_ctx, path, stbuf);
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}
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err_out:
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g_free(buffer);
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return err;
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}
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static int local_create_mapped_attr_dir(FsContext *ctx, const char *path)
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{
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int err;
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char *attr_dir;
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char *tmp_path = g_strdup(path);
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attr_dir = g_strdup_printf("%s/%s/%s",
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ctx->fs_root, dirname(tmp_path), VIRTFS_META_DIR);
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err = mkdir(attr_dir, 0700);
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if (err < 0 && errno == EEXIST) {
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err = 0;
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}
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g_free(attr_dir);
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g_free(tmp_path);
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return err;
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}
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static int local_set_mapped_file_attr(FsContext *ctx,
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const char *path, FsCred *credp)
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{
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FILE *fp;
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int ret = 0;
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char buf[ATTR_MAX];
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char *attr_path;
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int uid = -1, gid = -1, mode = -1, rdev = -1;
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attr_path = local_mapped_attr_path(ctx, path);
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fp = local_fopen(attr_path, "r");
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if (!fp) {
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goto create_map_file;
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}
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memset(buf, 0, ATTR_MAX);
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while (fgets(buf, ATTR_MAX, fp)) {
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if (!strncmp(buf, "virtfs.uid", 10)) {
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uid = atoi(buf+11);
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} else if (!strncmp(buf, "virtfs.gid", 10)) {
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gid = atoi(buf+11);
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} else if (!strncmp(buf, "virtfs.mode", 11)) {
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mode = atoi(buf+12);
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} else if (!strncmp(buf, "virtfs.rdev", 11)) {
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rdev = atoi(buf+12);
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}
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memset(buf, 0, ATTR_MAX);
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}
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fclose(fp);
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goto update_map_file;
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create_map_file:
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ret = local_create_mapped_attr_dir(ctx, path);
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if (ret < 0) {
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goto err_out;
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}
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update_map_file:
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fp = local_fopen(attr_path, "w");
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if (!fp) {
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ret = -1;
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goto err_out;
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}
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if (credp->fc_uid != -1) {
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uid = credp->fc_uid;
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}
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if (credp->fc_gid != -1) {
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gid = credp->fc_gid;
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}
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if (credp->fc_mode != -1) {
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mode = credp->fc_mode;
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}
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if (credp->fc_rdev != -1) {
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rdev = credp->fc_rdev;
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}
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if (uid != -1) {
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fprintf(fp, "virtfs.uid=%d\n", uid);
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}
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if (gid != -1) {
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fprintf(fp, "virtfs.gid=%d\n", gid);
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}
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if (mode != -1) {
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fprintf(fp, "virtfs.mode=%d\n", mode);
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}
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if (rdev != -1) {
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fprintf(fp, "virtfs.rdev=%d\n", rdev);
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}
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fclose(fp);
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err_out:
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g_free(attr_path);
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return ret;
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}
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static int local_set_xattr(const char *path, FsCred *credp)
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{
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int err;
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if (credp->fc_uid != -1) {
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uint32_t tmp_uid = cpu_to_le32(credp->fc_uid);
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err = setxattr(path, "user.virtfs.uid", &tmp_uid, sizeof(uid_t), 0);
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if (err) {
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return err;
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}
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}
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if (credp->fc_gid != -1) {
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uint32_t tmp_gid = cpu_to_le32(credp->fc_gid);
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err = setxattr(path, "user.virtfs.gid", &tmp_gid, sizeof(gid_t), 0);
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if (err) {
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return err;
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}
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}
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if (credp->fc_mode != -1) {
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uint32_t tmp_mode = cpu_to_le32(credp->fc_mode);
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err = setxattr(path, "user.virtfs.mode", &tmp_mode, sizeof(mode_t), 0);
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if (err) {
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return err;
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}
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}
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if (credp->fc_rdev != -1) {
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uint64_t tmp_rdev = cpu_to_le64(credp->fc_rdev);
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err = setxattr(path, "user.virtfs.rdev", &tmp_rdev, sizeof(dev_t), 0);
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if (err) {
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return err;
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}
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}
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return 0;
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}
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static int local_post_create_passthrough(FsContext *fs_ctx, const char *path,
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FsCred *credp)
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{
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char *buffer;
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buffer = rpath(fs_ctx, path);
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if (lchown(buffer, credp->fc_uid, credp->fc_gid) < 0) {
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/*
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* If we fail to change ownership and if we are
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* using security model none. Ignore the error
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*/
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if ((fs_ctx->export_flags & V9FS_SEC_MASK) != V9FS_SM_NONE) {
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goto err;
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}
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}
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if (chmod(buffer, credp->fc_mode & 07777) < 0) {
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goto err;
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}
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g_free(buffer);
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return 0;
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err:
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g_free(buffer);
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return -1;
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}
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static ssize_t local_readlink(FsContext *fs_ctx, V9fsPath *fs_path,
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char *buf, size_t bufsz)
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{
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ssize_t tsize = -1;
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char *buffer;
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char *path = fs_path->data;
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if ((fs_ctx->export_flags & V9FS_SM_MAPPED) ||
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(fs_ctx->export_flags & V9FS_SM_MAPPED_FILE)) {
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int fd;
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buffer = rpath(fs_ctx, path);
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fd = open(buffer, O_RDONLY | O_NOFOLLOW);
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g_free(buffer);
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if (fd == -1) {
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return -1;
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}
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do {
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tsize = read(fd, (void *)buf, bufsz);
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} while (tsize == -1 && errno == EINTR);
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close(fd);
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} else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
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(fs_ctx->export_flags & V9FS_SM_NONE)) {
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buffer = rpath(fs_ctx, path);
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tsize = readlink(buffer, buf, bufsz);
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g_free(buffer);
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}
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return tsize;
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}
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static int local_close(FsContext *ctx, V9fsFidOpenState *fs)
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{
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return close(fs->fd);
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}
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static int local_closedir(FsContext *ctx, V9fsFidOpenState *fs)
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{
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return closedir(fs->dir);
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}
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static int local_open(FsContext *ctx, V9fsPath *fs_path,
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int flags, V9fsFidOpenState *fs)
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{
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char *buffer;
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char *path = fs_path->data;
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buffer = rpath(ctx, path);
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fs->fd = open(buffer, flags | O_NOFOLLOW);
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g_free(buffer);
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return fs->fd;
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}
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static int local_opendir(FsContext *ctx,
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V9fsPath *fs_path, V9fsFidOpenState *fs)
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{
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char *buffer;
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char *path = fs_path->data;
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buffer = rpath(ctx, path);
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fs->dir = opendir(buffer);
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g_free(buffer);
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if (!fs->dir) {
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return -1;
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}
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return 0;
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}
|
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|
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static void local_rewinddir(FsContext *ctx, V9fsFidOpenState *fs)
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{
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return rewinddir(fs->dir);
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}
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|
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static off_t local_telldir(FsContext *ctx, V9fsFidOpenState *fs)
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{
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return telldir(fs->dir);
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}
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|
|
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static int local_readdir_r(FsContext *ctx, V9fsFidOpenState *fs,
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struct dirent *entry,
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struct dirent **result)
|
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{
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int ret;
|
|
|
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again:
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ret = readdir_r(fs->dir, entry, result);
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if (ctx->export_flags & V9FS_SM_MAPPED) {
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entry->d_type = DT_UNKNOWN;
|
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} else if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
|
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if (!ret && *result != NULL &&
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!strcmp(entry->d_name, VIRTFS_META_DIR)) {
|
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/* skp the meta data directory */
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goto again;
|
|
}
|
|
entry->d_type = DT_UNKNOWN;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static void local_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off)
|
|
{
|
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return seekdir(fs->dir, off);
|
|
}
|
|
|
|
static ssize_t local_preadv(FsContext *ctx, V9fsFidOpenState *fs,
|
|
const struct iovec *iov,
|
|
int iovcnt, off_t offset)
|
|
{
|
|
#ifdef CONFIG_PREADV
|
|
return preadv(fs->fd, iov, iovcnt, offset);
|
|
#else
|
|
int err = lseek(fs->fd, offset, SEEK_SET);
|
|
if (err == -1) {
|
|
return err;
|
|
} else {
|
|
return readv(fs->fd, iov, iovcnt);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static ssize_t local_pwritev(FsContext *ctx, V9fsFidOpenState *fs,
|
|
const struct iovec *iov,
|
|
int iovcnt, off_t offset)
|
|
{
|
|
ssize_t ret
|
|
;
|
|
#ifdef CONFIG_PREADV
|
|
ret = pwritev(fs->fd, iov, iovcnt, offset);
|
|
#else
|
|
int err = lseek(fs->fd, offset, SEEK_SET);
|
|
if (err == -1) {
|
|
return err;
|
|
} else {
|
|
ret = writev(fs->fd, iov, iovcnt);
|
|
}
|
|
#endif
|
|
#ifdef CONFIG_SYNC_FILE_RANGE
|
|
if (ret > 0 && ctx->export_flags & V9FS_IMMEDIATE_WRITEOUT) {
|
|
/*
|
|
* Initiate a writeback. This is not a data integrity sync.
|
|
* We want to ensure that we don't leave dirty pages in the cache
|
|
* after write when writeout=immediate is sepcified.
|
|
*/
|
|
sync_file_range(fs->fd, offset, ret,
|
|
SYNC_FILE_RANGE_WAIT_BEFORE | SYNC_FILE_RANGE_WRITE);
|
|
}
|
|
#endif
|
|
return ret;
|
|
}
|
|
|
|
static int local_chmod(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
|
|
{
|
|
char *buffer;
|
|
int ret = -1;
|
|
char *path = fs_path->data;
|
|
|
|
if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
|
|
buffer = rpath(fs_ctx, path);
|
|
ret = local_set_xattr(buffer, credp);
|
|
g_free(buffer);
|
|
} else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
|
|
return local_set_mapped_file_attr(fs_ctx, path, credp);
|
|
} else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
|
|
(fs_ctx->export_flags & V9FS_SM_NONE)) {
|
|
buffer = rpath(fs_ctx, path);
|
|
ret = chmod(buffer, credp->fc_mode);
|
|
g_free(buffer);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int local_mknod(FsContext *fs_ctx, V9fsPath *dir_path,
|
|
const char *name, FsCred *credp)
|
|
{
|
|
char *path;
|
|
int err = -1;
|
|
int serrno = 0;
|
|
V9fsString fullname;
|
|
char *buffer;
|
|
|
|
v9fs_string_init(&fullname);
|
|
v9fs_string_sprintf(&fullname, "%s/%s", dir_path->data, name);
|
|
path = fullname.data;
|
|
|
|
/* Determine the security model */
|
|
if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
|
|
buffer = rpath(fs_ctx, path);
|
|
err = mknod(buffer, SM_LOCAL_MODE_BITS|S_IFREG, 0);
|
|
if (err == -1) {
|
|
g_free(buffer);
|
|
goto out;
|
|
}
|
|
err = local_set_xattr(buffer, credp);
|
|
if (err == -1) {
|
|
serrno = errno;
|
|
goto err_end;
|
|
}
|
|
} else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
|
|
|
|
buffer = rpath(fs_ctx, path);
|
|
err = mknod(buffer, SM_LOCAL_MODE_BITS|S_IFREG, 0);
|
|
if (err == -1) {
|
|
g_free(buffer);
|
|
goto out;
|
|
}
|
|
err = local_set_mapped_file_attr(fs_ctx, path, credp);
|
|
if (err == -1) {
|
|
serrno = errno;
|
|
goto err_end;
|
|
}
|
|
} else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
|
|
(fs_ctx->export_flags & V9FS_SM_NONE)) {
|
|
buffer = rpath(fs_ctx, path);
|
|
err = mknod(buffer, credp->fc_mode, credp->fc_rdev);
|
|
if (err == -1) {
|
|
g_free(buffer);
|
|
goto out;
|
|
}
|
|
err = local_post_create_passthrough(fs_ctx, path, credp);
|
|
if (err == -1) {
|
|
serrno = errno;
|
|
goto err_end;
|
|
}
|
|
}
|
|
goto out;
|
|
|
|
err_end:
|
|
remove(buffer);
|
|
errno = serrno;
|
|
g_free(buffer);
|
|
out:
|
|
v9fs_string_free(&fullname);
|
|
return err;
|
|
}
|
|
|
|
static int local_mkdir(FsContext *fs_ctx, V9fsPath *dir_path,
|
|
const char *name, FsCred *credp)
|
|
{
|
|
char *path;
|
|
int err = -1;
|
|
int serrno = 0;
|
|
V9fsString fullname;
|
|
char *buffer;
|
|
|
|
v9fs_string_init(&fullname);
|
|
v9fs_string_sprintf(&fullname, "%s/%s", dir_path->data, name);
|
|
path = fullname.data;
|
|
|
|
/* Determine the security model */
|
|
if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
|
|
buffer = rpath(fs_ctx, path);
|
|
err = mkdir(buffer, SM_LOCAL_DIR_MODE_BITS);
|
|
if (err == -1) {
|
|
g_free(buffer);
|
|
goto out;
|
|
}
|
|
credp->fc_mode = credp->fc_mode|S_IFDIR;
|
|
err = local_set_xattr(buffer, credp);
|
|
if (err == -1) {
|
|
serrno = errno;
|
|
goto err_end;
|
|
}
|
|
} else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
|
|
buffer = rpath(fs_ctx, path);
|
|
err = mkdir(buffer, SM_LOCAL_DIR_MODE_BITS);
|
|
if (err == -1) {
|
|
g_free(buffer);
|
|
goto out;
|
|
}
|
|
credp->fc_mode = credp->fc_mode|S_IFDIR;
|
|
err = local_set_mapped_file_attr(fs_ctx, path, credp);
|
|
if (err == -1) {
|
|
serrno = errno;
|
|
goto err_end;
|
|
}
|
|
} else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
|
|
(fs_ctx->export_flags & V9FS_SM_NONE)) {
|
|
buffer = rpath(fs_ctx, path);
|
|
err = mkdir(buffer, credp->fc_mode);
|
|
if (err == -1) {
|
|
g_free(buffer);
|
|
goto out;
|
|
}
|
|
err = local_post_create_passthrough(fs_ctx, path, credp);
|
|
if (err == -1) {
|
|
serrno = errno;
|
|
goto err_end;
|
|
}
|
|
}
|
|
goto out;
|
|
|
|
err_end:
|
|
remove(buffer);
|
|
errno = serrno;
|
|
g_free(buffer);
|
|
out:
|
|
v9fs_string_free(&fullname);
|
|
return err;
|
|
}
|
|
|
|
static int local_fstat(FsContext *fs_ctx, int fid_type,
|
|
V9fsFidOpenState *fs, struct stat *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;
|
|
}
|
|
if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
|
|
/* Actual credentials are part of extended attrs */
|
|
uid_t tmp_uid;
|
|
gid_t tmp_gid;
|
|
mode_t tmp_mode;
|
|
dev_t tmp_dev;
|
|
|
|
if (fgetxattr(fd, "user.virtfs.uid", &tmp_uid, sizeof(uid_t)) > 0) {
|
|
stbuf->st_uid = le32_to_cpu(tmp_uid);
|
|
}
|
|
if (fgetxattr(fd, "user.virtfs.gid", &tmp_gid, sizeof(gid_t)) > 0) {
|
|
stbuf->st_gid = le32_to_cpu(tmp_gid);
|
|
}
|
|
if (fgetxattr(fd, "user.virtfs.mode", &tmp_mode, sizeof(mode_t)) > 0) {
|
|
stbuf->st_mode = le32_to_cpu(tmp_mode);
|
|
}
|
|
if (fgetxattr(fd, "user.virtfs.rdev", &tmp_dev, sizeof(dev_t)) > 0) {
|
|
stbuf->st_rdev = le64_to_cpu(tmp_dev);
|
|
}
|
|
} else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
|
|
errno = EOPNOTSUPP;
|
|
return -1;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int local_open2(FsContext *fs_ctx, V9fsPath *dir_path, const char *name,
|
|
int flags, FsCred *credp, V9fsFidOpenState *fs)
|
|
{
|
|
char *path;
|
|
int fd = -1;
|
|
int err = -1;
|
|
int serrno = 0;
|
|
V9fsString fullname;
|
|
char *buffer;
|
|
|
|
/*
|
|
* Mark all the open to not follow symlinks
|
|
*/
|
|
flags |= O_NOFOLLOW;
|
|
|
|
v9fs_string_init(&fullname);
|
|
v9fs_string_sprintf(&fullname, "%s/%s", dir_path->data, name);
|
|
path = fullname.data;
|
|
|
|
/* Determine the security model */
|
|
if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
|
|
buffer = rpath(fs_ctx, path);
|
|
fd = open(buffer, flags, SM_LOCAL_MODE_BITS);
|
|
if (fd == -1) {
|
|
g_free(buffer);
|
|
err = fd;
|
|
goto out;
|
|
}
|
|
credp->fc_mode = credp->fc_mode|S_IFREG;
|
|
/* Set cleint credentials in xattr */
|
|
err = local_set_xattr(buffer, credp);
|
|
if (err == -1) {
|
|
serrno = errno;
|
|
goto err_end;
|
|
}
|
|
} else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
|
|
buffer = rpath(fs_ctx, path);
|
|
fd = open(buffer, flags, SM_LOCAL_MODE_BITS);
|
|
if (fd == -1) {
|
|
g_free(buffer);
|
|
err = fd;
|
|
goto out;
|
|
}
|
|
credp->fc_mode = credp->fc_mode|S_IFREG;
|
|
/* Set client credentials in .virtfs_metadata directory files */
|
|
err = local_set_mapped_file_attr(fs_ctx, path, credp);
|
|
if (err == -1) {
|
|
serrno = errno;
|
|
goto err_end;
|
|
}
|
|
} else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
|
|
(fs_ctx->export_flags & V9FS_SM_NONE)) {
|
|
buffer = rpath(fs_ctx, path);
|
|
fd = open(buffer, flags, credp->fc_mode);
|
|
if (fd == -1) {
|
|
g_free(buffer);
|
|
err = fd;
|
|
goto out;
|
|
}
|
|
err = local_post_create_passthrough(fs_ctx, path, credp);
|
|
if (err == -1) {
|
|
serrno = errno;
|
|
goto err_end;
|
|
}
|
|
}
|
|
err = fd;
|
|
fs->fd = fd;
|
|
goto out;
|
|
|
|
err_end:
|
|
close(fd);
|
|
remove(buffer);
|
|
errno = serrno;
|
|
g_free(buffer);
|
|
out:
|
|
v9fs_string_free(&fullname);
|
|
return err;
|
|
}
|
|
|
|
|
|
static int local_symlink(FsContext *fs_ctx, const char *oldpath,
|
|
V9fsPath *dir_path, const char *name, FsCred *credp)
|
|
{
|
|
int err = -1;
|
|
int serrno = 0;
|
|
char *newpath;
|
|
V9fsString fullname;
|
|
char *buffer;
|
|
|
|
v9fs_string_init(&fullname);
|
|
v9fs_string_sprintf(&fullname, "%s/%s", dir_path->data, name);
|
|
newpath = fullname.data;
|
|
|
|
/* Determine the security model */
|
|
if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
|
|
int fd;
|
|
ssize_t oldpath_size, write_size;
|
|
buffer = rpath(fs_ctx, newpath);
|
|
fd = open(buffer, O_CREAT|O_EXCL|O_RDWR|O_NOFOLLOW, SM_LOCAL_MODE_BITS);
|
|
if (fd == -1) {
|
|
g_free(buffer);
|
|
err = fd;
|
|
goto out;
|
|
}
|
|
/* Write the oldpath (target) to the file. */
|
|
oldpath_size = strlen(oldpath);
|
|
do {
|
|
write_size = write(fd, (void *)oldpath, oldpath_size);
|
|
} while (write_size == -1 && errno == EINTR);
|
|
|
|
if (write_size != oldpath_size) {
|
|
serrno = errno;
|
|
close(fd);
|
|
err = -1;
|
|
goto err_end;
|
|
}
|
|
close(fd);
|
|
/* Set cleint credentials in symlink's xattr */
|
|
credp->fc_mode = credp->fc_mode|S_IFLNK;
|
|
err = local_set_xattr(buffer, credp);
|
|
if (err == -1) {
|
|
serrno = errno;
|
|
goto err_end;
|
|
}
|
|
} else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
|
|
int fd;
|
|
ssize_t oldpath_size, write_size;
|
|
buffer = rpath(fs_ctx, newpath);
|
|
fd = open(buffer, O_CREAT|O_EXCL|O_RDWR|O_NOFOLLOW, SM_LOCAL_MODE_BITS);
|
|
if (fd == -1) {
|
|
g_free(buffer);
|
|
err = fd;
|
|
goto out;
|
|
}
|
|
/* Write the oldpath (target) to the file. */
|
|
oldpath_size = strlen(oldpath);
|
|
do {
|
|
write_size = write(fd, (void *)oldpath, oldpath_size);
|
|
} while (write_size == -1 && errno == EINTR);
|
|
|
|
if (write_size != oldpath_size) {
|
|
serrno = errno;
|
|
close(fd);
|
|
err = -1;
|
|
goto err_end;
|
|
}
|
|
close(fd);
|
|
/* Set cleint credentials in symlink's xattr */
|
|
credp->fc_mode = credp->fc_mode|S_IFLNK;
|
|
err = local_set_mapped_file_attr(fs_ctx, newpath, credp);
|
|
if (err == -1) {
|
|
serrno = errno;
|
|
goto err_end;
|
|
}
|
|
} else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
|
|
(fs_ctx->export_flags & V9FS_SM_NONE)) {
|
|
buffer = rpath(fs_ctx, newpath);
|
|
err = symlink(oldpath, buffer);
|
|
if (err) {
|
|
g_free(buffer);
|
|
goto out;
|
|
}
|
|
err = lchown(buffer, credp->fc_uid, credp->fc_gid);
|
|
if (err == -1) {
|
|
/*
|
|
* If we fail to change ownership and if we are
|
|
* using security model none. Ignore the error
|
|
*/
|
|
if ((fs_ctx->export_flags & V9FS_SEC_MASK) != V9FS_SM_NONE) {
|
|
serrno = errno;
|
|
goto err_end;
|
|
} else
|
|
err = 0;
|
|
}
|
|
}
|
|
goto out;
|
|
|
|
err_end:
|
|
remove(buffer);
|
|
errno = serrno;
|
|
g_free(buffer);
|
|
out:
|
|
v9fs_string_free(&fullname);
|
|
return err;
|
|
}
|
|
|
|
static int local_link(FsContext *ctx, V9fsPath *oldpath,
|
|
V9fsPath *dirpath, const char *name)
|
|
{
|
|
int ret;
|
|
V9fsString newpath;
|
|
char *buffer, *buffer1;
|
|
|
|
v9fs_string_init(&newpath);
|
|
v9fs_string_sprintf(&newpath, "%s/%s", dirpath->data, name);
|
|
|
|
buffer = rpath(ctx, oldpath->data);
|
|
buffer1 = rpath(ctx, newpath.data);
|
|
ret = link(buffer, buffer1);
|
|
g_free(buffer);
|
|
g_free(buffer1);
|
|
|
|
/* now link the virtfs_metadata files */
|
|
if (!ret && (ctx->export_flags & V9FS_SM_MAPPED_FILE)) {
|
|
/* Link the .virtfs_metadata files. Create the metada directory */
|
|
ret = local_create_mapped_attr_dir(ctx, newpath.data);
|
|
if (ret < 0) {
|
|
goto err_out;
|
|
}
|
|
buffer = local_mapped_attr_path(ctx, oldpath->data);
|
|
buffer1 = local_mapped_attr_path(ctx, newpath.data);
|
|
ret = link(buffer, buffer1);
|
|
g_free(buffer);
|
|
g_free(buffer1);
|
|
if (ret < 0 && errno != ENOENT) {
|
|
goto err_out;
|
|
}
|
|
}
|
|
err_out:
|
|
v9fs_string_free(&newpath);
|
|
return ret;
|
|
}
|
|
|
|
static int local_truncate(FsContext *ctx, V9fsPath *fs_path, off_t size)
|
|
{
|
|
char *buffer;
|
|
int ret;
|
|
char *path = fs_path->data;
|
|
|
|
buffer = rpath(ctx, path);
|
|
ret = truncate(buffer, size);
|
|
g_free(buffer);
|
|
return ret;
|
|
}
|
|
|
|
static int local_rename(FsContext *ctx, const char *oldpath,
|
|
const char *newpath)
|
|
{
|
|
int err;
|
|
char *buffer, *buffer1;
|
|
|
|
if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
|
|
err = local_create_mapped_attr_dir(ctx, newpath);
|
|
if (err < 0) {
|
|
return err;
|
|
}
|
|
/* rename the .virtfs_metadata files */
|
|
buffer = local_mapped_attr_path(ctx, oldpath);
|
|
buffer1 = local_mapped_attr_path(ctx, newpath);
|
|
err = rename(buffer, buffer1);
|
|
g_free(buffer);
|
|
g_free(buffer1);
|
|
if (err < 0 && errno != ENOENT) {
|
|
return err;
|
|
}
|
|
}
|
|
|
|
buffer = rpath(ctx, oldpath);
|
|
buffer1 = rpath(ctx, newpath);
|
|
err = rename(buffer, buffer1);
|
|
g_free(buffer);
|
|
g_free(buffer1);
|
|
return err;
|
|
}
|
|
|
|
static int local_chown(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
|
|
{
|
|
char *buffer;
|
|
int ret = -1;
|
|
char *path = fs_path->data;
|
|
|
|
if ((credp->fc_uid == -1 && credp->fc_gid == -1) ||
|
|
(fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
|
|
(fs_ctx->export_flags & V9FS_SM_NONE)) {
|
|
buffer = rpath(fs_ctx, path);
|
|
ret = lchown(buffer, credp->fc_uid, credp->fc_gid);
|
|
g_free(buffer);
|
|
} else if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
|
|
buffer = rpath(fs_ctx, path);
|
|
ret = local_set_xattr(buffer, credp);
|
|
g_free(buffer);
|
|
} else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
|
|
return local_set_mapped_file_attr(fs_ctx, path, credp);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int local_utimensat(FsContext *s, V9fsPath *fs_path,
|
|
const struct timespec *buf)
|
|
{
|
|
char *buffer;
|
|
int ret;
|
|
char *path = fs_path->data;
|
|
|
|
buffer = rpath(s, path);
|
|
ret = qemu_utimens(buffer, buf);
|
|
g_free(buffer);
|
|
return ret;
|
|
}
|
|
|
|
static int local_remove(FsContext *ctx, const char *path)
|
|
{
|
|
int err;
|
|
struct stat stbuf;
|
|
char *buffer;
|
|
|
|
if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
|
|
buffer = rpath(ctx, path);
|
|
err = lstat(buffer, &stbuf);
|
|
g_free(buffer);
|
|
if (err) {
|
|
goto err_out;
|
|
}
|
|
/*
|
|
* If directory remove .virtfs_metadata contained in the
|
|
* directory
|
|
*/
|
|
if (S_ISDIR(stbuf.st_mode)) {
|
|
buffer = g_strdup_printf("%s/%s/%s", ctx->fs_root,
|
|
path, VIRTFS_META_DIR);
|
|
err = remove(buffer);
|
|
g_free(buffer);
|
|
if (err < 0 && errno != ENOENT) {
|
|
/*
|
|
* We didn't had the .virtfs_metadata file. May be file created
|
|
* in non-mapped mode ?. Ignore ENOENT.
|
|
*/
|
|
goto err_out;
|
|
}
|
|
}
|
|
/*
|
|
* Now remove the name from parent directory
|
|
* .virtfs_metadata directory
|
|
*/
|
|
buffer = local_mapped_attr_path(ctx, path);
|
|
err = remove(buffer);
|
|
g_free(buffer);
|
|
if (err < 0 && errno != ENOENT) {
|
|
/*
|
|
* We didn't had the .virtfs_metadata file. May be file created
|
|
* in non-mapped mode ?. Ignore ENOENT.
|
|
*/
|
|
goto err_out;
|
|
}
|
|
}
|
|
|
|
buffer = rpath(ctx, path);
|
|
err = remove(buffer);
|
|
g_free(buffer);
|
|
err_out:
|
|
return err;
|
|
}
|
|
|
|
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(fd);
|
|
} else {
|
|
return fsync(fd);
|
|
}
|
|
}
|
|
|
|
static int local_statfs(FsContext *s, V9fsPath *fs_path, struct statfs *stbuf)
|
|
{
|
|
char *buffer;
|
|
int ret;
|
|
char *path = fs_path->data;
|
|
|
|
buffer = rpath(s, path);
|
|
ret = statfs(buffer, stbuf);
|
|
g_free(buffer);
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t local_lgetxattr(FsContext *ctx, V9fsPath *fs_path,
|
|
const char *name, void *value, size_t size)
|
|
{
|
|
char *path = fs_path->data;
|
|
|
|
return v9fs_get_xattr(ctx, path, name, value, size);
|
|
}
|
|
|
|
static ssize_t local_llistxattr(FsContext *ctx, V9fsPath *fs_path,
|
|
void *value, size_t size)
|
|
{
|
|
char *path = fs_path->data;
|
|
|
|
return v9fs_list_xattr(ctx, path, value, size);
|
|
}
|
|
|
|
static int local_lsetxattr(FsContext *ctx, V9fsPath *fs_path, const char *name,
|
|
void *value, size_t size, int flags)
|
|
{
|
|
char *path = fs_path->data;
|
|
|
|
return v9fs_set_xattr(ctx, path, name, value, size, flags);
|
|
}
|
|
|
|
static int local_lremovexattr(FsContext *ctx, V9fsPath *fs_path,
|
|
const char *name)
|
|
{
|
|
char *path = fs_path->data;
|
|
|
|
return v9fs_remove_xattr(ctx, path, name);
|
|
}
|
|
|
|
static int local_name_to_path(FsContext *ctx, V9fsPath *dir_path,
|
|
const char *name, V9fsPath *target)
|
|
{
|
|
if (dir_path) {
|
|
v9fs_string_sprintf((V9fsString *)target, "%s/%s",
|
|
dir_path->data, name);
|
|
} else {
|
|
v9fs_string_sprintf((V9fsString *)target, "%s", name);
|
|
}
|
|
/* Bump the size for including terminating NULL */
|
|
target->size++;
|
|
return 0;
|
|
}
|
|
|
|
static int local_renameat(FsContext *ctx, V9fsPath *olddir,
|
|
const char *old_name, V9fsPath *newdir,
|
|
const char *new_name)
|
|
{
|
|
int ret;
|
|
V9fsString old_full_name, new_full_name;
|
|
|
|
v9fs_string_init(&old_full_name);
|
|
v9fs_string_init(&new_full_name);
|
|
|
|
v9fs_string_sprintf(&old_full_name, "%s/%s", olddir->data, old_name);
|
|
v9fs_string_sprintf(&new_full_name, "%s/%s", newdir->data, new_name);
|
|
|
|
ret = local_rename(ctx, old_full_name.data, new_full_name.data);
|
|
v9fs_string_free(&old_full_name);
|
|
v9fs_string_free(&new_full_name);
|
|
return ret;
|
|
}
|
|
|
|
static int local_unlinkat(FsContext *ctx, V9fsPath *dir,
|
|
const char *name, int flags)
|
|
{
|
|
int ret;
|
|
V9fsString fullname;
|
|
char *buffer;
|
|
|
|
v9fs_string_init(&fullname);
|
|
|
|
v9fs_string_sprintf(&fullname, "%s/%s", dir->data, name);
|
|
if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
|
|
if (flags == AT_REMOVEDIR) {
|
|
/*
|
|
* If directory remove .virtfs_metadata contained in the
|
|
* directory
|
|
*/
|
|
buffer = g_strdup_printf("%s/%s/%s", ctx->fs_root,
|
|
fullname.data, VIRTFS_META_DIR);
|
|
ret = remove(buffer);
|
|
g_free(buffer);
|
|
if (ret < 0 && errno != ENOENT) {
|
|
/*
|
|
* We didn't had the .virtfs_metadata file. May be file created
|
|
* in non-mapped mode ?. Ignore ENOENT.
|
|
*/
|
|
goto err_out;
|
|
}
|
|
}
|
|
/*
|
|
* Now remove the name from parent directory
|
|
* .virtfs_metadata directory.
|
|
*/
|
|
buffer = local_mapped_attr_path(ctx, fullname.data);
|
|
ret = remove(buffer);
|
|
g_free(buffer);
|
|
if (ret < 0 && errno != ENOENT) {
|
|
/*
|
|
* We didn't had the .virtfs_metadata file. May be file created
|
|
* in non-mapped mode ?. Ignore ENOENT.
|
|
*/
|
|
goto err_out;
|
|
}
|
|
}
|
|
/* Remove the name finally */
|
|
buffer = rpath(ctx, fullname.data);
|
|
ret = remove(buffer);
|
|
g_free(buffer);
|
|
|
|
err_out:
|
|
v9fs_string_free(&fullname);
|
|
return ret;
|
|
}
|
|
|
|
static int local_ioc_getversion(FsContext *ctx, V9fsPath *path,
|
|
mode_t st_mode, uint64_t *st_gen)
|
|
{
|
|
#ifdef FS_IOC_GETVERSION
|
|
int err;
|
|
V9fsFidOpenState fid_open;
|
|
|
|
/*
|
|
* Do not try to open special files like device nodes, fifos etc
|
|
* We can get fd for regular files and directories only
|
|
*/
|
|
if (!S_ISREG(st_mode) && !S_ISDIR(st_mode)) {
|
|
errno = ENOTTY;
|
|
return -1;
|
|
}
|
|
err = local_open(ctx, path, O_RDONLY, &fid_open);
|
|
if (err < 0) {
|
|
return err;
|
|
}
|
|
err = ioctl(fid_open.fd, FS_IOC_GETVERSION, st_gen);
|
|
local_close(ctx, &fid_open);
|
|
return err;
|
|
#else
|
|
errno = ENOTTY;
|
|
return -1;
|
|
#endif
|
|
}
|
|
|
|
static int local_init(FsContext *ctx)
|
|
{
|
|
int err = 0;
|
|
struct statfs stbuf;
|
|
|
|
if (ctx->export_flags & V9FS_SM_PASSTHROUGH) {
|
|
ctx->xops = passthrough_xattr_ops;
|
|
} else if (ctx->export_flags & V9FS_SM_MAPPED) {
|
|
ctx->xops = mapped_xattr_ops;
|
|
} else if (ctx->export_flags & V9FS_SM_NONE) {
|
|
ctx->xops = none_xattr_ops;
|
|
} else if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
|
|
/*
|
|
* xattr operation for mapped-file and passthrough
|
|
* remain same.
|
|
*/
|
|
ctx->xops = passthrough_xattr_ops;
|
|
}
|
|
ctx->export_flags |= V9FS_PATHNAME_FSCONTEXT;
|
|
#ifdef FS_IOC_GETVERSION
|
|
/*
|
|
* use ioc_getversion only if the iocl is definied
|
|
*/
|
|
err = statfs(ctx->fs_root, &stbuf);
|
|
if (!err) {
|
|
switch (stbuf.f_type) {
|
|
case EXT2_SUPER_MAGIC:
|
|
case BTRFS_SUPER_MAGIC:
|
|
case REISERFS_SUPER_MAGIC:
|
|
case XFS_SUPER_MAGIC:
|
|
ctx->exops.get_st_gen = local_ioc_getversion;
|
|
break;
|
|
}
|
|
}
|
|
#endif
|
|
return err;
|
|
}
|
|
|
|
static int local_parse_opts(QemuOpts *opts, struct FsDriverEntry *fse)
|
|
{
|
|
const char *sec_model = qemu_opt_get(opts, "security_model");
|
|
const char *path = qemu_opt_get(opts, "path");
|
|
|
|
if (!sec_model) {
|
|
fprintf(stderr, "security model not specified, "
|
|
"local fs needs security model\nvalid options are:"
|
|
"\tsecurity_model=[passthrough|mapped|none]\n");
|
|
return -1;
|
|
}
|
|
|
|
if (!strcmp(sec_model, "passthrough")) {
|
|
fse->export_flags |= V9FS_SM_PASSTHROUGH;
|
|
} else if (!strcmp(sec_model, "mapped") ||
|
|
!strcmp(sec_model, "mapped-xattr")) {
|
|
fse->export_flags |= V9FS_SM_MAPPED;
|
|
} else if (!strcmp(sec_model, "none")) {
|
|
fse->export_flags |= V9FS_SM_NONE;
|
|
} else if (!strcmp(sec_model, "mapped-file")) {
|
|
fse->export_flags |= V9FS_SM_MAPPED_FILE;
|
|
} else {
|
|
fprintf(stderr, "Invalid security model %s specified, valid options are"
|
|
"\n\t [passthrough|mapped-xattr|mapped-file|none]\n",
|
|
sec_model);
|
|
return -1;
|
|
}
|
|
|
|
if (!path) {
|
|
fprintf(stderr, "fsdev: No path specified.\n");
|
|
return -1;
|
|
}
|
|
fse->path = g_strdup(path);
|
|
|
|
return 0;
|
|
}
|
|
|
|
FileOperations local_ops = {
|
|
.parse_opts = local_parse_opts,
|
|
.init = local_init,
|
|
.lstat = local_lstat,
|
|
.readlink = local_readlink,
|
|
.close = local_close,
|
|
.closedir = local_closedir,
|
|
.open = local_open,
|
|
.opendir = local_opendir,
|
|
.rewinddir = local_rewinddir,
|
|
.telldir = local_telldir,
|
|
.readdir_r = local_readdir_r,
|
|
.seekdir = local_seekdir,
|
|
.preadv = local_preadv,
|
|
.pwritev = local_pwritev,
|
|
.chmod = local_chmod,
|
|
.mknod = local_mknod,
|
|
.mkdir = local_mkdir,
|
|
.fstat = local_fstat,
|
|
.open2 = local_open2,
|
|
.symlink = local_symlink,
|
|
.link = local_link,
|
|
.truncate = local_truncate,
|
|
.rename = local_rename,
|
|
.chown = local_chown,
|
|
.utimensat = local_utimensat,
|
|
.remove = local_remove,
|
|
.fsync = local_fsync,
|
|
.statfs = local_statfs,
|
|
.lgetxattr = local_lgetxattr,
|
|
.llistxattr = local_llistxattr,
|
|
.lsetxattr = local_lsetxattr,
|
|
.lremovexattr = local_lremovexattr,
|
|
.name_to_path = local_name_to_path,
|
|
.renameat = local_renameat,
|
|
.unlinkat = local_unlinkat,
|
|
};
|