| /* |
| * 9p Posix callback |
| * |
| * Copyright IBM, Corp. 2010 |
| * |
| * Authors: |
| * Anthony Liguori <aliguori@us.ibm.com> |
| * |
| * This work is licensed under the terms of the GNU GPL, version 2. See |
| * the COPYING file in the top-level directory. |
| */ |
| |
| /* |
| * Not so fast! You might want to read the 9p developer docs first: |
| * https://wiki.qemu.org/Documentation/9p |
| */ |
| |
| #include "qemu/osdep.h" |
| #include "9p.h" |
| #include "9p-local.h" |
| #include "9p-xattr.h" |
| #include "9p-util.h" |
| #include "fsdev/qemu-fsdev.h" /* local_ops */ |
| #include <arpa/inet.h> |
| #include <pwd.h> |
| #include <grp.h> |
| #include <sys/socket.h> |
| #include <sys/un.h> |
| #include "qemu/xattr.h" |
| #include "qapi/error.h" |
| #include "qemu/cutils.h" |
| #include "qemu/error-report.h" |
| #include "qemu/option.h" |
| #include <libgen.h> |
| #ifdef CONFIG_LINUX |
| #include <linux/fs.h> |
| #ifdef CONFIG_LINUX_MAGIC_H |
| #include <linux/magic.h> |
| #endif |
| #endif |
| #include <sys/ioctl.h> |
| |
| #ifndef XFS_SUPER_MAGIC |
| #define XFS_SUPER_MAGIC 0x58465342 |
| #endif |
| #ifndef EXT2_SUPER_MAGIC |
| #define EXT2_SUPER_MAGIC 0xEF53 |
| #endif |
| #ifndef REISERFS_SUPER_MAGIC |
| #define REISERFS_SUPER_MAGIC 0x52654973 |
| #endif |
| #ifndef BTRFS_SUPER_MAGIC |
| #define BTRFS_SUPER_MAGIC 0x9123683E |
| #endif |
| |
| typedef struct { |
| int mountfd; |
| } LocalData; |
| |
| int local_open_nofollow(FsContext *fs_ctx, const char *path, int flags, |
| mode_t mode) |
| { |
| LocalData *data = fs_ctx->private; |
| int fd = data->mountfd; |
| |
| while (*path && fd != -1) { |
| const char *c; |
| int next_fd; |
| char *head; |
| |
| /* Only relative paths without consecutive slashes */ |
| assert(*path != '/'); |
| |
| head = g_strdup(path); |
| c = qemu_strchrnul(path, '/'); |
| if (*c) { |
| /* Intermediate path element */ |
| head[c - path] = 0; |
| path = c + 1; |
| next_fd = openat_dir(fd, head); |
| } else { |
| /* Rightmost path element */ |
| next_fd = openat_file(fd, head, flags, mode); |
| path = c; |
| } |
| g_free(head); |
| if (fd != data->mountfd) { |
| close_preserve_errno(fd); |
| } |
| fd = next_fd; |
| } |
| |
| assert(fd != data->mountfd); |
| return fd; |
| } |
| |
| int local_opendir_nofollow(FsContext *fs_ctx, const char *path) |
| { |
| return local_open_nofollow(fs_ctx, path, O_DIRECTORY | O_RDONLY, 0); |
| } |
| |
| static void renameat_preserve_errno(int odirfd, const char *opath, int ndirfd, |
| const char *npath) |
| { |
| int serrno = errno; |
| qemu_renameat(odirfd, opath, ndirfd, npath); |
| errno = serrno; |
| } |
| |
| static void unlinkat_preserve_errno(int dirfd, const char *path, int flags) |
| { |
| int serrno = errno; |
| qemu_unlinkat(dirfd, path, flags); |
| errno = serrno; |
| } |
| |
| #define VIRTFS_META_DIR ".virtfs_metadata" |
| #define VIRTFS_META_ROOT_FILE VIRTFS_META_DIR "_root" |
| |
| static FILE *local_fopenat(int dirfd, const char *name, const char *mode) |
| { |
| int fd, o_mode = 0; |
| FILE *fp; |
| int flags; |
| /* |
| * only supports two modes |
| */ |
| if (mode[0] == 'r') { |
| flags = O_RDONLY; |
| } else if (mode[0] == 'w') { |
| flags = O_WRONLY | O_TRUNC | O_CREAT; |
| o_mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH; |
| } else { |
| return NULL; |
| } |
| fd = openat_file(dirfd, name, flags, o_mode); |
| if (fd == -1) { |
| return NULL; |
| } |
| fp = fdopen(fd, mode); |
| if (!fp) { |
| close(fd); |
| } |
| return fp; |
| } |
| |
| #define ATTR_MAX 100 |
| static void local_mapped_file_attr(int dirfd, const char *name, |
| struct stat *stbuf) |
| { |
| FILE *fp; |
| char buf[ATTR_MAX]; |
| int map_dirfd; |
| |
| if (strcmp(name, ".")) { |
| map_dirfd = openat_dir(dirfd, VIRTFS_META_DIR); |
| if (map_dirfd == -1) { |
| return; |
| } |
| |
| fp = local_fopenat(map_dirfd, name, "r"); |
| close_preserve_errno(map_dirfd); |
| } else { |
| fp = local_fopenat(dirfd, VIRTFS_META_ROOT_FILE, "r"); |
| } |
| if (!fp) { |
| return; |
| } |
| memset(buf, 0, ATTR_MAX); |
| while (fgets(buf, ATTR_MAX, fp)) { |
| if (!strncmp(buf, "virtfs.uid", 10)) { |
| stbuf->st_uid = atoi(buf + 11); |
| } else if (!strncmp(buf, "virtfs.gid", 10)) { |
| stbuf->st_gid = atoi(buf + 11); |
| } else if (!strncmp(buf, "virtfs.mode", 11)) { |
| stbuf->st_mode = atoi(buf + 12); |
| } else if (!strncmp(buf, "virtfs.rdev", 11)) { |
| stbuf->st_rdev = atoi(buf + 12); |
| } |
| memset(buf, 0, ATTR_MAX); |
| } |
| fclose(fp); |
| } |
| |
| static int local_lstat(FsContext *fs_ctx, V9fsPath *fs_path, struct stat *stbuf) |
| { |
| int err = -1; |
| char *dirpath = g_path_get_dirname(fs_path->data); |
| char *name = g_path_get_basename(fs_path->data); |
| int dirfd; |
| |
| dirfd = local_opendir_nofollow(fs_ctx, dirpath); |
| if (dirfd == -1) { |
| goto out; |
| } |
| |
| err = qemu_fstatat(dirfd, name, stbuf, AT_SYMLINK_NOFOLLOW); |
| if (err) { |
| goto err_out; |
| } |
| 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 (fgetxattrat_nofollow(dirfd, name, "user.virtfs.uid", &tmp_uid, |
| sizeof(uid_t)) > 0) { |
| stbuf->st_uid = le32_to_cpu(tmp_uid); |
| } |
| if (fgetxattrat_nofollow(dirfd, name, "user.virtfs.gid", &tmp_gid, |
| sizeof(gid_t)) > 0) { |
| stbuf->st_gid = le32_to_cpu(tmp_gid); |
| } |
| if (fgetxattrat_nofollow(dirfd, name, "user.virtfs.mode", &tmp_mode, |
| sizeof(mode_t)) > 0) { |
| stbuf->st_mode = le32_to_cpu(tmp_mode); |
| } |
| if (fgetxattrat_nofollow(dirfd, name, "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) { |
| local_mapped_file_attr(dirfd, name, stbuf); |
| } |
| |
| err_out: |
| close_preserve_errno(dirfd); |
| out: |
| g_free(name); |
| g_free(dirpath); |
| return err; |
| } |
| |
| static int local_set_mapped_file_attrat(int dirfd, const char *name, |
| FsCred *credp) |
| { |
| FILE *fp; |
| int ret; |
| char buf[ATTR_MAX]; |
| int uid = -1, gid = -1, mode = -1, rdev = -1; |
| int map_dirfd = -1, map_fd; |
| bool is_root = !strcmp(name, "."); |
| |
| if (is_root) { |
| fp = local_fopenat(dirfd, VIRTFS_META_ROOT_FILE, "r"); |
| if (!fp) { |
| if (errno == ENOENT) { |
| goto update_map_file; |
| } else { |
| return -1; |
| } |
| } |
| } else { |
| ret = qemu_mkdirat(dirfd, VIRTFS_META_DIR, 0700); |
| if (ret < 0 && errno != EEXIST) { |
| return -1; |
| } |
| |
| map_dirfd = openat_dir(dirfd, VIRTFS_META_DIR); |
| if (map_dirfd == -1) { |
| return -1; |
| } |
| |
| fp = local_fopenat(map_dirfd, name, "r"); |
| if (!fp) { |
| if (errno == ENOENT) { |
| goto update_map_file; |
| } else { |
| close_preserve_errno(map_dirfd); |
| return -1; |
| } |
| } |
| } |
| memset(buf, 0, ATTR_MAX); |
| while (fgets(buf, ATTR_MAX, fp)) { |
| if (!strncmp(buf, "virtfs.uid", 10)) { |
| uid = atoi(buf + 11); |
| } else if (!strncmp(buf, "virtfs.gid", 10)) { |
| gid = atoi(buf + 11); |
| } else if (!strncmp(buf, "virtfs.mode", 11)) { |
| mode = atoi(buf + 12); |
| } else if (!strncmp(buf, "virtfs.rdev", 11)) { |
| rdev = atoi(buf + 12); |
| } |
| memset(buf, 0, ATTR_MAX); |
| } |
| fclose(fp); |
| |
| update_map_file: |
| if (is_root) { |
| fp = local_fopenat(dirfd, VIRTFS_META_ROOT_FILE, "w"); |
| } else { |
| fp = local_fopenat(map_dirfd, name, "w"); |
| /* We can't go this far with map_dirfd not being a valid file descriptor |
| * but some versions of gcc aren't smart enough to see it. |
| */ |
| if (map_dirfd != -1) { |
| close_preserve_errno(map_dirfd); |
| } |
| } |
| if (!fp) { |
| return -1; |
| } |
| |
| map_fd = fileno(fp); |
| assert(map_fd != -1); |
| ret = fchmod(map_fd, 0600); |
| assert(ret == 0); |
| |
| if (credp->fc_uid != -1) { |
| uid = credp->fc_uid; |
| } |
| if (credp->fc_gid != -1) { |
| gid = credp->fc_gid; |
| } |
| if (credp->fc_mode != (mode_t)-1) { |
| mode = credp->fc_mode; |
| } |
| if (credp->fc_rdev != -1) { |
| rdev = credp->fc_rdev; |
| } |
| |
| if (uid != -1) { |
| fprintf(fp, "virtfs.uid=%d\n", uid); |
| } |
| if (gid != -1) { |
| fprintf(fp, "virtfs.gid=%d\n", gid); |
| } |
| if (mode != -1) { |
| fprintf(fp, "virtfs.mode=%d\n", mode); |
| } |
| if (rdev != -1) { |
| fprintf(fp, "virtfs.rdev=%d\n", rdev); |
| } |
| fclose(fp); |
| |
| return 0; |
| } |
| |
| static int fchmodat_nofollow(int dirfd, const char *name, mode_t mode) |
| { |
| struct stat stbuf; |
| int fd, ret; |
| |
| /* FIXME: this should be handled with fchmodat(AT_SYMLINK_NOFOLLOW). |
| * Unfortunately, the linux kernel doesn't implement it yet. |
| */ |
| |
| /* First, we clear non-racing symlinks out of the way. */ |
| if (qemu_fstatat(dirfd, name, &stbuf, AT_SYMLINK_NOFOLLOW)) { |
| return -1; |
| } |
| if (S_ISLNK(stbuf.st_mode)) { |
| errno = ELOOP; |
| return -1; |
| } |
| |
| fd = openat_file(dirfd, name, O_RDONLY | O_PATH_9P_UTIL | O_NOFOLLOW, 0); |
| #if O_PATH_9P_UTIL == 0 |
| /* Fallback for systems that don't support O_PATH: we depend on the file |
| * being readable or writable. |
| */ |
| if (fd == -1) { |
| /* In case the file is writable-only and isn't a directory. */ |
| if (errno == EACCES) { |
| fd = openat_file(dirfd, name, O_WRONLY, 0); |
| } |
| if (fd == -1 && errno == EISDIR) { |
| errno = EACCES; |
| } |
| } |
| if (fd == -1) { |
| return -1; |
| } |
| ret = fchmod(fd, mode); |
| #else |
| /* Access modes are ignored when O_PATH is supported. If name is a symbolic |
| * link, O_PATH | O_NOFOLLOW causes openat(2) to return a file descriptor |
| * referring to the symbolic link. |
| */ |
| if (fd == -1) { |
| return -1; |
| } |
| |
| /* Now we handle racing symlinks. */ |
| ret = fstat(fd, &stbuf); |
| if (!ret) { |
| if (S_ISLNK(stbuf.st_mode)) { |
| errno = ELOOP; |
| ret = -1; |
| } else { |
| char *proc_path = g_strdup_printf("/proc/self/fd/%d", fd); |
| ret = chmod(proc_path, mode); |
| g_free(proc_path); |
| } |
| } |
| #endif |
| close_preserve_errno(fd); |
| return ret; |
| } |
| |
| static int local_set_xattrat(int dirfd, const char *path, FsCred *credp) |
| { |
| int err; |
| |
| if (credp->fc_uid != -1) { |
| uint32_t tmp_uid = cpu_to_le32(credp->fc_uid); |
| err = fsetxattrat_nofollow(dirfd, path, "user.virtfs.uid", &tmp_uid, |
| sizeof(uid_t), 0); |
| if (err) { |
| return err; |
| } |
| } |
| if (credp->fc_gid != -1) { |
| uint32_t tmp_gid = cpu_to_le32(credp->fc_gid); |
| err = fsetxattrat_nofollow(dirfd, path, "user.virtfs.gid", &tmp_gid, |
| sizeof(gid_t), 0); |
| if (err) { |
| return err; |
| } |
| } |
| if (credp->fc_mode != (mode_t)-1) { |
| uint32_t tmp_mode = cpu_to_le32(credp->fc_mode); |
| err = fsetxattrat_nofollow(dirfd, path, "user.virtfs.mode", &tmp_mode, |
| sizeof(mode_t), 0); |
| if (err) { |
| return err; |
| } |
| } |
| if (credp->fc_rdev != -1) { |
| uint64_t tmp_rdev = cpu_to_le64(credp->fc_rdev); |
| err = fsetxattrat_nofollow(dirfd, path, "user.virtfs.rdev", &tmp_rdev, |
| sizeof(dev_t), 0); |
| if (err) { |
| return err; |
| } |
| } |
| return 0; |
| } |
| |
| static int local_set_cred_passthrough(FsContext *fs_ctx, int dirfd, |
| const char *name, FsCred *credp) |
| { |
| if (fchownat(dirfd, name, credp->fc_uid, credp->fc_gid, |
| AT_SYMLINK_NOFOLLOW) < 0) { |
| /* |
| * 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) { |
| return -1; |
| } |
| } |
| |
| return fchmodat_nofollow(dirfd, name, credp->fc_mode & 07777); |
| } |
| |
| static ssize_t local_readlink(FsContext *fs_ctx, V9fsPath *fs_path, |
| char *buf, size_t bufsz) |
| { |
| ssize_t tsize = -1; |
| |
| if ((fs_ctx->export_flags & V9FS_SM_MAPPED) || |
| (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE)) { |
| int fd; |
| |
| fd = local_open_nofollow(fs_ctx, fs_path->data, O_RDONLY, 0); |
| if (fd == -1) { |
| return -1; |
| } |
| tsize = RETRY_ON_EINTR(read(fd, (void *)buf, bufsz)); |
| close_preserve_errno(fd); |
| } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) || |
| (fs_ctx->export_flags & V9FS_SM_NONE)) { |
| char *dirpath = g_path_get_dirname(fs_path->data); |
| char *name = g_path_get_basename(fs_path->data); |
| int dirfd; |
| |
| dirfd = local_opendir_nofollow(fs_ctx, dirpath); |
| if (dirfd == -1) { |
| goto out; |
| } |
| |
| tsize = readlinkat(dirfd, name, buf, bufsz); |
| close_preserve_errno(dirfd); |
| out: |
| g_free(name); |
| g_free(dirpath); |
| } |
| return tsize; |
| } |
| |
| static int local_close(FsContext *ctx, V9fsFidOpenState *fs) |
| { |
| return close(fs->fd); |
| } |
| |
| static int local_closedir(FsContext *ctx, V9fsFidOpenState *fs) |
| { |
| return closedir(fs->dir.stream); |
| } |
| |
| static int local_open(FsContext *ctx, V9fsPath *fs_path, |
| int flags, V9fsFidOpenState *fs) |
| { |
| int fd; |
| |
| fd = local_open_nofollow(ctx, fs_path->data, flags, 0); |
| if (fd == -1) { |
| return -1; |
| } |
| fs->fd = fd; |
| return fs->fd; |
| } |
| |
| static int local_opendir(FsContext *ctx, |
| V9fsPath *fs_path, V9fsFidOpenState *fs) |
| { |
| int dirfd; |
| DIR *stream; |
| |
| dirfd = local_opendir_nofollow(ctx, fs_path->data); |
| if (dirfd == -1) { |
| return -1; |
| } |
| |
| stream = fdopendir(dirfd); |
| if (!stream) { |
| close(dirfd); |
| return -1; |
| } |
| fs->dir.stream = stream; |
| return 0; |
| } |
| |
| static void local_rewinddir(FsContext *ctx, V9fsFidOpenState *fs) |
| { |
| rewinddir(fs->dir.stream); |
| } |
| |
| static off_t local_telldir(FsContext *ctx, V9fsFidOpenState *fs) |
| { |
| return telldir(fs->dir.stream); |
| } |
| |
| static bool local_is_mapped_file_metadata(FsContext *fs_ctx, const char *name) |
| { |
| return |
| !strcmp(name, VIRTFS_META_DIR) || !strcmp(name, VIRTFS_META_ROOT_FILE); |
| } |
| |
| static struct dirent *local_readdir(FsContext *ctx, V9fsFidOpenState *fs) |
| { |
| struct dirent *entry; |
| |
| again: |
| entry = readdir(fs->dir.stream); |
| if (!entry) { |
| return NULL; |
| } |
| #ifdef CONFIG_DARWIN |
| int off; |
| off = telldir(fs->dir.stream); |
| /* If telldir fails, fail the entire readdir call */ |
| if (off < 0) { |
| return NULL; |
| } |
| entry->d_seekoff = off; |
| #endif |
| |
| if (ctx->export_flags & V9FS_SM_MAPPED) { |
| entry->d_type = DT_UNKNOWN; |
| } else if (ctx->export_flags & V9FS_SM_MAPPED_FILE) { |
| if (local_is_mapped_file_metadata(ctx, entry->d_name)) { |
| /* skip the meta data */ |
| goto again; |
| } |
| entry->d_type = DT_UNKNOWN; |
| } |
| |
| return entry; |
| } |
| |
| static void local_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off) |
| { |
| seekdir(fs->dir.stream, 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 specified. |
| */ |
| 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 *dirpath = g_path_get_dirname(fs_path->data); |
| char *name = g_path_get_basename(fs_path->data); |
| int ret = -1; |
| int dirfd; |
| |
| dirfd = local_opendir_nofollow(fs_ctx, dirpath); |
| if (dirfd == -1) { |
| goto out; |
| } |
| |
| if (fs_ctx->export_flags & V9FS_SM_MAPPED) { |
| ret = local_set_xattrat(dirfd, name, credp); |
| } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { |
| ret = local_set_mapped_file_attrat(dirfd, name, credp); |
| } else if (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH || |
| fs_ctx->export_flags & V9FS_SM_NONE) { |
| ret = fchmodat_nofollow(dirfd, name, credp->fc_mode); |
| } |
| close_preserve_errno(dirfd); |
| |
| out: |
| g_free(dirpath); |
| g_free(name); |
| return ret; |
| } |
| |
| static int local_mknod(FsContext *fs_ctx, V9fsPath *dir_path, |
| const char *name, FsCred *credp) |
| { |
| int err = -1; |
| int dirfd; |
| |
| if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE && |
| local_is_mapped_file_metadata(fs_ctx, name)) { |
| errno = EINVAL; |
| return -1; |
| } |
| |
| dirfd = local_opendir_nofollow(fs_ctx, dir_path->data); |
| if (dirfd == -1) { |
| return -1; |
| } |
| |
| if (fs_ctx->export_flags & V9FS_SM_MAPPED || |
| fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { |
| err = qemu_mknodat(dirfd, name, fs_ctx->fmode | S_IFREG, 0); |
| if (err == -1) { |
| goto out; |
| } |
| |
| if (fs_ctx->export_flags & V9FS_SM_MAPPED) { |
| err = local_set_xattrat(dirfd, name, credp); |
| } else { |
| err = local_set_mapped_file_attrat(dirfd, name, credp); |
| } |
| if (err == -1) { |
| goto err_end; |
| } |
| } else if (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH || |
| fs_ctx->export_flags & V9FS_SM_NONE) { |
| err = qemu_mknodat(dirfd, name, credp->fc_mode, credp->fc_rdev); |
| if (err == -1) { |
| goto out; |
| } |
| err = local_set_cred_passthrough(fs_ctx, dirfd, name, credp); |
| if (err == -1) { |
| goto err_end; |
| } |
| } |
| goto out; |
| |
| err_end: |
| unlinkat_preserve_errno(dirfd, name, 0); |
| out: |
| close_preserve_errno(dirfd); |
| return err; |
| } |
| |
| static int local_mkdir(FsContext *fs_ctx, V9fsPath *dir_path, |
| const char *name, FsCred *credp) |
| { |
| int err = -1; |
| int dirfd; |
| |
| if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE && |
| local_is_mapped_file_metadata(fs_ctx, name)) { |
| errno = EINVAL; |
| return -1; |
| } |
| |
| dirfd = local_opendir_nofollow(fs_ctx, dir_path->data); |
| if (dirfd == -1) { |
| return -1; |
| } |
| |
| if (fs_ctx->export_flags & V9FS_SM_MAPPED || |
| fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { |
| err = qemu_mkdirat(dirfd, name, fs_ctx->dmode); |
| if (err == -1) { |
| goto out; |
| } |
| credp->fc_mode = credp->fc_mode | S_IFDIR; |
| |
| if (fs_ctx->export_flags & V9FS_SM_MAPPED) { |
| err = local_set_xattrat(dirfd, name, credp); |
| } else { |
| err = local_set_mapped_file_attrat(dirfd, name, credp); |
| } |
| if (err == -1) { |
| goto err_end; |
| } |
| } else if (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH || |
| fs_ctx->export_flags & V9FS_SM_NONE) { |
| err = qemu_mkdirat(dirfd, name, credp->fc_mode); |
| if (err == -1) { |
| goto out; |
| } |
| err = local_set_cred_passthrough(fs_ctx, dirfd, name, credp); |
| if (err == -1) { |
| goto err_end; |
| } |
| } |
| goto out; |
| |
| err_end: |
| unlinkat_preserve_errno(dirfd, name, AT_REMOVEDIR); |
| out: |
| close_preserve_errno(dirfd); |
| return err; |
| } |
| |
| static int local_fid_fd(int fid_type, V9fsFidOpenState *fs) |
| { |
| if (fid_type == P9_FID_DIR) { |
| return dirfd(fs->dir.stream); |
| } else { |
| return fs->fd; |
| } |
| } |
| |
| static int local_fstat(FsContext *fs_ctx, int fid_type, |
| V9fsFidOpenState *fs, struct stat *stbuf) |
| { |
| int err, fd = local_fid_fd(fid_type, fs); |
| |
| 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 (qemu_fgetxattr(fd, "user.virtfs.uid", |
| &tmp_uid, sizeof(uid_t)) > 0) { |
| stbuf->st_uid = le32_to_cpu(tmp_uid); |
| } |
| if (qemu_fgetxattr(fd, "user.virtfs.gid", |
| &tmp_gid, sizeof(gid_t)) > 0) { |
| stbuf->st_gid = le32_to_cpu(tmp_gid); |
| } |
| if (qemu_fgetxattr(fd, "user.virtfs.mode", |
| &tmp_mode, sizeof(mode_t)) > 0) { |
| stbuf->st_mode = le32_to_cpu(tmp_mode); |
| } |
| if (qemu_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) |
| { |
| int fd = -1; |
| int err = -1; |
| int dirfd; |
| |
| if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE && |
| local_is_mapped_file_metadata(fs_ctx, name)) { |
| errno = EINVAL; |
| return -1; |
| } |
| |
| /* |
| * Mark all the open to not follow symlinks |
| */ |
| flags |= O_NOFOLLOW; |
| |
| dirfd = local_opendir_nofollow(fs_ctx, dir_path->data); |
| if (dirfd == -1) { |
| return -1; |
| } |
| |
| /* Determine the security model */ |
| if (fs_ctx->export_flags & V9FS_SM_MAPPED || |
| fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { |
| fd = openat_file(dirfd, name, flags, fs_ctx->fmode); |
| if (fd == -1) { |
| goto out; |
| } |
| credp->fc_mode = credp->fc_mode | S_IFREG; |
| if (fs_ctx->export_flags & V9FS_SM_MAPPED) { |
| /* Set client credentials in xattr */ |
| err = local_set_xattrat(dirfd, name, credp); |
| } else { |
| err = local_set_mapped_file_attrat(dirfd, name, credp); |
| } |
| if (err == -1) { |
| goto err_end; |
| } |
| } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) || |
| (fs_ctx->export_flags & V9FS_SM_NONE)) { |
| fd = openat_file(dirfd, name, flags, credp->fc_mode); |
| if (fd == -1) { |
| goto out; |
| } |
| err = local_set_cred_passthrough(fs_ctx, dirfd, name, credp); |
| if (err == -1) { |
| goto err_end; |
| } |
| } |
| err = fd; |
| fs->fd = fd; |
| goto out; |
| |
| err_end: |
| unlinkat_preserve_errno(dirfd, name, |
| flags & O_DIRECTORY ? AT_REMOVEDIR : 0); |
| close_preserve_errno(fd); |
| out: |
| close_preserve_errno(dirfd); |
| return err; |
| } |
| |
| |
| static int local_symlink(FsContext *fs_ctx, const char *oldpath, |
| V9fsPath *dir_path, const char *name, FsCred *credp) |
| { |
| int err = -1; |
| int dirfd; |
| |
| if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE && |
| local_is_mapped_file_metadata(fs_ctx, name)) { |
| errno = EINVAL; |
| return -1; |
| } |
| |
| dirfd = local_opendir_nofollow(fs_ctx, dir_path->data); |
| if (dirfd == -1) { |
| return -1; |
| } |
| |
| /* Determine the security model */ |
| if (fs_ctx->export_flags & V9FS_SM_MAPPED || |
| fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { |
| int fd; |
| ssize_t oldpath_size, write_size; |
| |
| fd = openat_file(dirfd, name, O_CREAT | O_EXCL | O_RDWR, |
| fs_ctx->fmode); |
| if (fd == -1) { |
| goto out; |
| } |
| /* Write the oldpath (target) to the file. */ |
| oldpath_size = strlen(oldpath); |
| write_size = RETRY_ON_EINTR(write(fd, (void *)oldpath, oldpath_size)); |
| close_preserve_errno(fd); |
| |
| if (write_size != oldpath_size) { |
| goto err_end; |
| } |
| /* Set client credentials in symlink's xattr */ |
| credp->fc_mode = credp->fc_mode | S_IFLNK; |
| |
| if (fs_ctx->export_flags & V9FS_SM_MAPPED) { |
| err = local_set_xattrat(dirfd, name, credp); |
| } else { |
| err = local_set_mapped_file_attrat(dirfd, name, credp); |
| } |
| if (err == -1) { |
| goto err_end; |
| } |
| } else if (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH || |
| fs_ctx->export_flags & V9FS_SM_NONE) { |
| err = symlinkat(oldpath, dirfd, name); |
| if (err) { |
| goto out; |
| } |
| err = fchownat(dirfd, name, credp->fc_uid, credp->fc_gid, |
| AT_SYMLINK_NOFOLLOW); |
| 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) { |
| goto err_end; |
| } else { |
| err = 0; |
| } |
| } |
| } |
| goto out; |
| |
| err_end: |
| unlinkat_preserve_errno(dirfd, name, 0); |
| out: |
| close_preserve_errno(dirfd); |
| return err; |
| } |
| |
| static int local_link(FsContext *ctx, V9fsPath *oldpath, |
| V9fsPath *dirpath, const char *name) |
| { |
| char *odirpath = g_path_get_dirname(oldpath->data); |
| char *oname = g_path_get_basename(oldpath->data); |
| int ret = -1; |
| int odirfd, ndirfd; |
| |
| if (ctx->export_flags & V9FS_SM_MAPPED_FILE && |
| local_is_mapped_file_metadata(ctx, name)) { |
| errno = EINVAL; |
| goto out; |
| } |
| |
| odirfd = local_opendir_nofollow(ctx, odirpath); |
| if (odirfd == -1) { |
| goto out; |
| } |
| |
| ndirfd = local_opendir_nofollow(ctx, dirpath->data); |
| if (ndirfd == -1) { |
| close_preserve_errno(odirfd); |
| goto out; |
| } |
| |
| ret = linkat(odirfd, oname, ndirfd, name, 0); |
| if (ret < 0) { |
| goto out_close; |
| } |
| |
| /* now link the virtfs_metadata files */ |
| if (ctx->export_flags & V9FS_SM_MAPPED_FILE) { |
| int omap_dirfd, nmap_dirfd; |
| |
| ret = qemu_mkdirat(ndirfd, VIRTFS_META_DIR, 0700); |
| if (ret < 0 && errno != EEXIST) { |
| goto err_undo_link; |
| } |
| |
| omap_dirfd = openat_dir(odirfd, VIRTFS_META_DIR); |
| if (omap_dirfd == -1) { |
| goto err; |
| } |
| |
| nmap_dirfd = openat_dir(ndirfd, VIRTFS_META_DIR); |
| if (nmap_dirfd == -1) { |
| close_preserve_errno(omap_dirfd); |
| goto err; |
| } |
| |
| ret = linkat(omap_dirfd, oname, nmap_dirfd, name, 0); |
| close_preserve_errno(nmap_dirfd); |
| close_preserve_errno(omap_dirfd); |
| if (ret < 0 && errno != ENOENT) { |
| goto err_undo_link; |
| } |
| |
| ret = 0; |
| } |
| goto out_close; |
| |
| err: |
| ret = -1; |
| err_undo_link: |
| unlinkat_preserve_errno(ndirfd, name, 0); |
| out_close: |
| close_preserve_errno(ndirfd); |
| close_preserve_errno(odirfd); |
| out: |
| g_free(oname); |
| g_free(odirpath); |
| return ret; |
| } |
| |
| static int local_truncate(FsContext *ctx, V9fsPath *fs_path, off_t size) |
| { |
| int fd, ret; |
| |
| fd = local_open_nofollow(ctx, fs_path->data, O_WRONLY, 0); |
| if (fd == -1) { |
| return -1; |
| } |
| ret = ftruncate(fd, size); |
| close_preserve_errno(fd); |
| return ret; |
| } |
| |
| static int local_ftruncate(FsContext *ctx, int fid_type, V9fsFidOpenState *fs, |
| off_t size) |
| { |
| int fd = local_fid_fd(fid_type, fs); |
| |
| return ftruncate(fd, size); |
| } |
| |
| static int local_chown(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp) |
| { |
| char *dirpath = g_path_get_dirname(fs_path->data); |
| char *name = g_path_get_basename(fs_path->data); |
| int ret = -1; |
| int dirfd; |
| |
| dirfd = local_opendir_nofollow(fs_ctx, dirpath); |
| if (dirfd == -1) { |
| goto out; |
| } |
| |
| if ((credp->fc_uid == -1 && credp->fc_gid == -1) || |
| (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) || |
| (fs_ctx->export_flags & V9FS_SM_NONE)) { |
| ret = fchownat(dirfd, name, credp->fc_uid, credp->fc_gid, |
| AT_SYMLINK_NOFOLLOW); |
| } else if (fs_ctx->export_flags & V9FS_SM_MAPPED) { |
| ret = local_set_xattrat(dirfd, name, credp); |
| } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { |
| ret = local_set_mapped_file_attrat(dirfd, name, credp); |
| } |
| |
| close_preserve_errno(dirfd); |
| out: |
| g_free(name); |
| g_free(dirpath); |
| return ret; |
| } |
| |
| static int local_utimensat(FsContext *s, V9fsPath *fs_path, |
| const struct timespec *buf) |
| { |
| char *dirpath = g_path_get_dirname(fs_path->data); |
| char *name = g_path_get_basename(fs_path->data); |
| int dirfd, ret = -1; |
| |
| dirfd = local_opendir_nofollow(s, dirpath); |
| if (dirfd == -1) { |
| goto out; |
| } |
| |
| ret = qemu_utimensat(dirfd, name, buf, AT_SYMLINK_NOFOLLOW); |
| close_preserve_errno(dirfd); |
| out: |
| g_free(dirpath); |
| g_free(name); |
| return ret; |
| } |
| |
| static int local_futimens(FsContext *s, int fid_type, V9fsFidOpenState *fs, |
| const struct timespec *times) |
| { |
| int fd = local_fid_fd(fid_type, fs); |
| |
| return qemu_futimens(fd, times); |
| } |
| |
| static int local_unlinkat_common(FsContext *ctx, int dirfd, const char *name, |
| int flags) |
| { |
| int ret; |
| |
| if (ctx->export_flags & V9FS_SM_MAPPED_FILE) { |
| int map_dirfd; |
| |
| /* We need to remove the metadata as well: |
| * - the metadata directory if we're removing a directory |
| * - the metadata file in the parent's metadata directory |
| * |
| * If any of these are missing (ie, ENOENT) then we're probably |
| * trying to remove something that wasn't created in mapped-file |
| * mode. We just ignore the error. |
| */ |
| if (flags == AT_REMOVEDIR) { |
| int fd; |
| |
| fd = openat_dir(dirfd, name); |
| if (fd == -1) { |
| return -1; |
| } |
| ret = qemu_unlinkat(fd, VIRTFS_META_DIR, AT_REMOVEDIR); |
| close_preserve_errno(fd); |
| if (ret < 0 && errno != ENOENT) { |
| return -1; |
| } |
| } |
| map_dirfd = openat_dir(dirfd, VIRTFS_META_DIR); |
| if (map_dirfd != -1) { |
| ret = qemu_unlinkat(map_dirfd, name, 0); |
| close_preserve_errno(map_dirfd); |
| if (ret < 0 && errno != ENOENT) { |
| return -1; |
| } |
| } else if (errno != ENOENT) { |
| return -1; |
| } |
| } |
| |
| return qemu_unlinkat(dirfd, name, flags); |
| } |
| |
| static int local_remove(FsContext *ctx, const char *path) |
| { |
| struct stat stbuf; |
| char *dirpath = g_path_get_dirname(path); |
| char *name = g_path_get_basename(path); |
| int flags = 0; |
| int dirfd; |
| int err = -1; |
| |
| dirfd = local_opendir_nofollow(ctx, dirpath); |
| if (dirfd == -1) { |
| goto out; |
| } |
| |
| if (qemu_fstatat(dirfd, name, &stbuf, AT_SYMLINK_NOFOLLOW) < 0) { |
| goto err_out; |
| } |
| |
| if (S_ISDIR(stbuf.st_mode)) { |
| flags |= AT_REMOVEDIR; |
| } |
| |
| err = local_unlinkat_common(ctx, dirfd, name, flags); |
| err_out: |
| close_preserve_errno(dirfd); |
| out: |
| g_free(name); |
| g_free(dirpath); |
| return err; |
| } |
| |
| static int local_fsync(FsContext *ctx, int fid_type, |
| V9fsFidOpenState *fs, int datasync) |
| { |
| int fd = local_fid_fd(fid_type, fs); |
| |
| if (datasync) { |
| return qemu_fdatasync(fd); |
| } else { |
| return fsync(fd); |
| } |
| } |
| |
| static int local_statfs(FsContext *s, V9fsPath *fs_path, struct statfs *stbuf) |
| { |
| int fd, ret; |
| |
| fd = local_open_nofollow(s, fs_path->data, O_RDONLY, 0); |
| if (fd == -1) { |
| return -1; |
| } |
| ret = fstatfs(fd, stbuf); |
| close_preserve_errno(fd); |
| 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 (ctx->export_flags & V9FS_SM_MAPPED_FILE && |
| local_is_mapped_file_metadata(ctx, name)) { |
| errno = EINVAL; |
| return -1; |
| } |
| |
| if (dir_path) { |
| if (!strcmp(name, ".")) { |
| /* "." relative to "foo/bar" is "foo/bar" */ |
| v9fs_path_copy(target, dir_path); |
| } else if (!strcmp(name, "..")) { |
| if (!strcmp(dir_path->data, ".")) { |
| /* ".." relative to the root is "." */ |
| v9fs_path_sprintf(target, "."); |
| } else { |
| char *tmp = g_path_get_dirname(dir_path->data); |
| /* Symbolic links are resolved by the client. We can assume |
| * that ".." relative to "foo/bar" is equivalent to "foo" |
| */ |
| v9fs_path_sprintf(target, "%s", tmp); |
| g_free(tmp); |
| } |
| } else { |
| assert(!strchr(name, '/')); |
| v9fs_path_sprintf(target, "%s/%s", dir_path->data, name); |
| } |
| } else if (!strcmp(name, "/") || !strcmp(name, ".") || |
| !strcmp(name, "..")) { |
| /* This is the root fid */ |
| v9fs_path_sprintf(target, "."); |
| } else { |
| assert(!strchr(name, '/')); |
| v9fs_path_sprintf(target, "./%s", name); |
| } |
| return 0; |
| } |
| |
| static int local_renameat(FsContext *ctx, V9fsPath *olddir, |
| const char *old_name, V9fsPath *newdir, |
| const char *new_name) |
| { |
| int ret; |
| int odirfd, ndirfd; |
| |
| if (ctx->export_flags & V9FS_SM_MAPPED_FILE && |
| (local_is_mapped_file_metadata(ctx, old_name) || |
| local_is_mapped_file_metadata(ctx, new_name))) { |
| errno = EINVAL; |
| return -1; |
| } |
| |
| odirfd = local_opendir_nofollow(ctx, olddir->data); |
| if (odirfd == -1) { |
| return -1; |
| } |
| |
| ndirfd = local_opendir_nofollow(ctx, newdir->data); |
| if (ndirfd == -1) { |
| close_preserve_errno(odirfd); |
| return -1; |
| } |
| |
| ret = qemu_renameat(odirfd, old_name, ndirfd, new_name); |
| if (ret < 0) { |
| goto out; |
| } |
| |
| if (ctx->export_flags & V9FS_SM_MAPPED_FILE) { |
| int omap_dirfd, nmap_dirfd; |
| |
| ret = qemu_mkdirat(ndirfd, VIRTFS_META_DIR, 0700); |
| if (ret < 0 && errno != EEXIST) { |
| goto err_undo_rename; |
| } |
| |
| omap_dirfd = openat_dir(odirfd, VIRTFS_META_DIR); |
| if (omap_dirfd == -1) { |
| goto err; |
| } |
| |
| nmap_dirfd = openat_dir(ndirfd, VIRTFS_META_DIR); |
| if (nmap_dirfd == -1) { |
| close_preserve_errno(omap_dirfd); |
| goto err; |
| } |
| |
| /* rename the .virtfs_metadata files */ |
| ret = qemu_renameat(omap_dirfd, old_name, nmap_dirfd, new_name); |
| close_preserve_errno(nmap_dirfd); |
| close_preserve_errno(omap_dirfd); |
| if (ret < 0 && errno != ENOENT) { |
| goto err_undo_rename; |
| } |
| |
| ret = 0; |
| } |
| goto out; |
| |
| err: |
| ret = -1; |
| err_undo_rename: |
| renameat_preserve_errno(ndirfd, new_name, odirfd, old_name); |
| out: |
| close_preserve_errno(ndirfd); |
| close_preserve_errno(odirfd); |
| return ret; |
| } |
| |
| static void v9fs_path_init_dirname(V9fsPath *path, const char *str) |
| { |
| path->data = g_path_get_dirname(str); |
| path->size = strlen(path->data) + 1; |
| } |
| |
| static int local_rename(FsContext *ctx, const char *oldpath, |
| const char *newpath) |
| { |
| int err; |
| char *oname = g_path_get_basename(oldpath); |
| char *nname = g_path_get_basename(newpath); |
| V9fsPath olddir, newdir; |
| |
| v9fs_path_init_dirname(&olddir, oldpath); |
| v9fs_path_init_dirname(&newdir, newpath); |
| |
| err = local_renameat(ctx, &olddir, oname, &newdir, nname); |
| |
| v9fs_path_free(&newdir); |
| v9fs_path_free(&olddir); |
| g_free(nname); |
| g_free(oname); |
| |
| return err; |
| } |
| |
| static int local_unlinkat(FsContext *ctx, V9fsPath *dir, |
| const char *name, int flags) |
| { |
| int ret; |
| int dirfd; |
| |
| if (ctx->export_flags & V9FS_SM_MAPPED_FILE && |
| local_is_mapped_file_metadata(ctx, name)) { |
| errno = EINVAL; |
| return -1; |
| } |
| |
| dirfd = local_opendir_nofollow(ctx, dir->data); |
| if (dirfd == -1) { |
| return -1; |
| } |
| |
| ret = local_unlinkat_common(ctx, dirfd, name, flags); |
| close_preserve_errno(dirfd); |
| return ret; |
| } |
| |
| #ifdef FS_IOC_GETVERSION |
| static int local_ioc_getversion(FsContext *ctx, V9fsPath *path, |
| mode_t st_mode, uint64_t *st_gen) |
| { |
| 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; |
| } |
| #endif |
| |
| static int local_ioc_getversion_init(FsContext *ctx, LocalData *data, Error **errp) |
| { |
| #ifdef FS_IOC_GETVERSION |
| struct statfs stbuf; |
| |
| /* |
| * use ioc_getversion only if the ioctl is defined |
| */ |
| if (fstatfs(data->mountfd, &stbuf) < 0) { |
| error_setg_errno(errp, errno, |
| "failed to stat file system at '%s'", ctx->fs_root); |
| return -1; |
| } |
| 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 0; |
| } |
| |
| static int local_init(FsContext *ctx, Error **errp) |
| { |
| LocalData *data = g_malloc(sizeof(*data)); |
| |
| data->mountfd = open(ctx->fs_root, O_DIRECTORY | O_RDONLY); |
| if (data->mountfd == -1) { |
| error_setg_errno(errp, errno, "failed to open '%s'", ctx->fs_root); |
| goto err; |
| } |
| |
| if (local_ioc_getversion_init(ctx, data, errp) < 0) { |
| close(data->mountfd); |
| goto err; |
| } |
| |
| 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; |
| |
| ctx->private = data; |
| return 0; |
| |
| err: |
| g_free(data); |
| return -1; |
| } |
| |
| static void local_cleanup(FsContext *ctx) |
| { |
| LocalData *data = ctx->private; |
| |
| if (!data) { |
| return; |
| } |
| |
| close(data->mountfd); |
| g_free(data); |
| } |
| |
| static void error_append_security_model_hint(Error *const *errp) |
| { |
| error_append_hint(errp, "Valid options are: security_model=" |
| "[passthrough|mapped-xattr|mapped-file|none]\n"); |
| } |
| |
| static int local_parse_opts(QemuOpts *opts, FsDriverEntry *fse, Error **errp) |
| { |
| ERRP_GUARD(); |
| const char *sec_model = qemu_opt_get(opts, "security_model"); |
| const char *path = qemu_opt_get(opts, "path"); |
| const char *multidevs = qemu_opt_get(opts, "multidevs"); |
| |
| if (!sec_model) { |
| error_setg(errp, "security_model property not set"); |
| error_append_security_model_hint(errp); |
| 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 { |
| error_setg(errp, "invalid security_model property '%s'", sec_model); |
| error_append_security_model_hint(errp); |
| return -1; |
| } |
| |
| if (multidevs) { |
| if (!strcmp(multidevs, "remap")) { |
| fse->export_flags &= ~V9FS_FORBID_MULTIDEVS; |
| fse->export_flags |= V9FS_REMAP_INODES; |
| } else if (!strcmp(multidevs, "forbid")) { |
| fse->export_flags &= ~V9FS_REMAP_INODES; |
| fse->export_flags |= V9FS_FORBID_MULTIDEVS; |
| } else if (!strcmp(multidevs, "warn")) { |
| fse->export_flags &= ~V9FS_FORBID_MULTIDEVS; |
| fse->export_flags &= ~V9FS_REMAP_INODES; |
| } else { |
| error_setg(errp, "invalid multidevs property '%s'", |
| multidevs); |
| error_append_hint(errp, "Valid options are: multidevs=" |
| "[remap|forbid|warn]\n"); |
| return -1; |
| } |
| } else { |
| fse->export_flags &= ~V9FS_FORBID_MULTIDEVS; |
| fse->export_flags |= V9FS_REMAP_INODES; |
| } |
| |
| if (!path) { |
| error_setg(errp, "path property not set"); |
| return -1; |
| } |
| |
| if (fsdev_throttle_parse_opts(opts, &fse->fst, errp)) { |
| error_prepend(errp, "invalid throttle configuration: "); |
| return -1; |
| } |
| |
| if (fse->export_flags & V9FS_SM_MAPPED || |
| fse->export_flags & V9FS_SM_MAPPED_FILE) { |
| fse->fmode = |
| qemu_opt_get_number(opts, "fmode", SM_LOCAL_MODE_BITS) & 0777; |
| fse->dmode = |
| qemu_opt_get_number(opts, "dmode", SM_LOCAL_DIR_MODE_BITS) & 0777; |
| } else { |
| if (qemu_opt_find(opts, "fmode")) { |
| error_setg(errp, "fmode is only valid for mapped security modes"); |
| return -1; |
| } |
| if (qemu_opt_find(opts, "dmode")) { |
| error_setg(errp, "dmode is only valid for mapped security modes"); |
| return -1; |
| } |
| } |
| |
| fse->path = g_strdup(path); |
| |
| return 0; |
| } |
| |
| static bool local_has_valid_file_handle(int fid_type, V9fsFidOpenState *fs) |
| { |
| return |
| (fid_type == P9_FID_FILE && fs->fd != -1) || |
| (fid_type == P9_FID_DIR && fs->dir.stream != NULL); |
| } |
| |
| FileOperations local_ops = { |
| .parse_opts = local_parse_opts, |
| .init = local_init, |
| .cleanup = local_cleanup, |
| .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 = local_readdir, |
| .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, |
| .has_valid_file_handle = local_has_valid_file_handle, |
| .ftruncate = local_ftruncate, |
| .futimens = local_futimens, |
| }; |
