diff options
Diffstat (limited to 'qemu/hw/9pfs/9p-local.c')
| -rw-r--r-- | qemu/hw/9pfs/9p-local.c | 1282 |
1 files changed, 0 insertions, 1282 deletions
diff --git a/qemu/hw/9pfs/9p-local.c b/qemu/hw/9pfs/9p-local.c deleted file mode 100644 index 16f45f485..000000000 --- a/qemu/hw/9pfs/9p-local.c +++ /dev/null @@ -1,1282 +0,0 @@ -/* - * 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. - * - */ - -#include "qemu/osdep.h" -#include "9p.h" -#include "9p-xattr.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 "qemu/cutils.h" -#include "qemu/error-report.h" -#include <libgen.h> -#include <linux/fs.h> -#ifdef CONFIG_LINUX_MAGIC_H -#include <linux/magic.h> -#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 - -#define VIRTFS_META_DIR ".virtfs_metadata" - -static char *local_mapped_attr_path(FsContext *ctx, const char *path) -{ - int dirlen; - const char *name = strrchr(path, '/'); - if (name) { - dirlen = name - path; - ++name; - } else { - name = path; - dirlen = 0; - } - return g_strdup_printf("%s/%.*s/%s/%s", ctx->fs_root, - dirlen, path, VIRTFS_META_DIR, name); -} - -static FILE *local_fopen(const char *path, const char *mode) -{ - int fd, o_mode = 0; - FILE *fp; - int flags = O_NOFOLLOW; - /* - * 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 = open(path, 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(FsContext *ctx, const char *path, - struct stat *stbuf) -{ - FILE *fp; - char buf[ATTR_MAX]; - char *attr_path; - - attr_path = local_mapped_attr_path(ctx, path); - fp = local_fopen(attr_path, "r"); - g_free(attr_path); - 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; - char *buffer; - char *path = fs_path->data; - - buffer = rpath(fs_ctx, path); - err = lstat(buffer, stbuf); - 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 (getxattr(buffer, "user.virtfs.uid", &tmp_uid, sizeof(uid_t)) > 0) { - stbuf->st_uid = le32_to_cpu(tmp_uid); - } - if (getxattr(buffer, "user.virtfs.gid", &tmp_gid, sizeof(gid_t)) > 0) { - stbuf->st_gid = le32_to_cpu(tmp_gid); - } - if (getxattr(buffer, "user.virtfs.mode", - &tmp_mode, sizeof(mode_t)) > 0) { - stbuf->st_mode = le32_to_cpu(tmp_mode); - } - if (getxattr(buffer, "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(fs_ctx, path, stbuf); - } - -err_out: - g_free(buffer); - return err; -} - -static int local_create_mapped_attr_dir(FsContext *ctx, const char *path) -{ - int err; - char *attr_dir; - char *tmp_path = g_strdup(path); - - attr_dir = g_strdup_printf("%s/%s/%s", - ctx->fs_root, dirname(tmp_path), VIRTFS_META_DIR); - - err = mkdir(attr_dir, 0700); - if (err < 0 && errno == EEXIST) { - err = 0; - } - g_free(attr_dir); - g_free(tmp_path); - return err; -} - -static int local_set_mapped_file_attr(FsContext *ctx, - const char *path, FsCred *credp) -{ - FILE *fp; - int ret = 0; - char buf[ATTR_MAX]; - char *attr_path; - int uid = -1, gid = -1, mode = -1, rdev = -1; - - attr_path = local_mapped_attr_path(ctx, path); - fp = local_fopen(attr_path, "r"); - if (!fp) { - goto create_map_file; - } - 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); - goto update_map_file; - -create_map_file: - ret = local_create_mapped_attr_dir(ctx, path); - if (ret < 0) { - goto err_out; - } - -update_map_file: - fp = local_fopen(attr_path, "w"); - if (!fp) { - ret = -1; - goto err_out; - } - - if (credp->fc_uid != -1) { - uid = credp->fc_uid; - } - if (credp->fc_gid != -1) { - gid = credp->fc_gid; - } - if (credp->fc_mode != -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); - -err_out: - g_free(attr_path); - return ret; -} - -static int local_set_xattr(const char *path, FsCred *credp) -{ - int err; - - if (credp->fc_uid != -1) { - uint32_t tmp_uid = cpu_to_le32(credp->fc_uid); - err = setxattr(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 = setxattr(path, "user.virtfs.gid", &tmp_gid, sizeof(gid_t), 0); - if (err) { - return err; - } - } - if (credp->fc_mode != -1) { - uint32_t tmp_mode = cpu_to_le32(credp->fc_mode); - err = setxattr(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 = setxattr(path, "user.virtfs.rdev", &tmp_rdev, sizeof(dev_t), 0); - if (err) { - return err; - } - } - return 0; -} - -static int local_post_create_passthrough(FsContext *fs_ctx, const char *path, - FsCred *credp) -{ - char *buffer; - - buffer = rpath(fs_ctx, path); - if (lchown(buffer, credp->fc_uid, credp->fc_gid) < 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) { - goto err; - } - } - - if (chmod(buffer, credp->fc_mode & 07777) < 0) { - goto err; - } - - g_free(buffer); - return 0; -err: - g_free(buffer); - return -1; -} - -static ssize_t local_readlink(FsContext *fs_ctx, V9fsPath *fs_path, - char *buf, size_t bufsz) -{ - ssize_t tsize = -1; - char *buffer; - char *path = fs_path->data; - - if ((fs_ctx->export_flags & V9FS_SM_MAPPED) || - (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE)) { - int fd; - buffer = rpath(fs_ctx, path); - fd = open(buffer, O_RDONLY | O_NOFOLLOW); - g_free(buffer); - if (fd == -1) { - return -1; - } - do { - tsize = read(fd, (void *)buf, bufsz); - } while (tsize == -1 && errno == EINTR); - close(fd); - } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) || - (fs_ctx->export_flags & V9FS_SM_NONE)) { - buffer = rpath(fs_ctx, path); - tsize = readlink(buffer, buf, bufsz); - g_free(buffer); - } - 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); -} - -static int local_open(FsContext *ctx, V9fsPath *fs_path, - int flags, V9fsFidOpenState *fs) -{ - char *buffer; - char *path = fs_path->data; - - buffer = rpath(ctx, path); - fs->fd = open(buffer, flags | O_NOFOLLOW); - g_free(buffer); - return fs->fd; -} - -static int local_opendir(FsContext *ctx, - V9fsPath *fs_path, V9fsFidOpenState *fs) -{ - char *buffer; - char *path = fs_path->data; - - buffer = rpath(ctx, path); - fs->dir = opendir(buffer); - g_free(buffer); - if (!fs->dir) { - return -1; - } - return 0; -} - -static void local_rewinddir(FsContext *ctx, V9fsFidOpenState *fs) -{ - rewinddir(fs->dir); -} - -static off_t local_telldir(FsContext *ctx, V9fsFidOpenState *fs) -{ - return telldir(fs->dir); -} - -static int local_readdir_r(FsContext *ctx, V9fsFidOpenState *fs, - struct dirent *entry, - struct dirent **result) -{ - int ret; - -again: - ret = readdir_r(fs->dir, entry, result); - if (ctx->export_flags & V9FS_SM_MAPPED) { - entry->d_type = DT_UNKNOWN; - } else if (ctx->export_flags & V9FS_SM_MAPPED_FILE) { - if (!ret && *result != NULL && - !strcmp(entry->d_name, VIRTFS_META_DIR)) { - /* skp the meta data directory */ - goto again; - } - entry->d_type = DT_UNKNOWN; - } - return ret; -} - -static void local_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off) -{ - 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 = NULL; - - 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) { - 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) { - 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) { - 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; -out: - g_free(buffer); - 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 = NULL; - - 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) { - 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) { - 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) { - 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; -out: - g_free(buffer); - 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 = NULL; - - /* - * 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) { - 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) { - 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) { - 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; -out: - g_free(buffer); - 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 = NULL; - - 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) { - 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) { - 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) { - 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; -out: - g_free(buffer); - 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) { - error_report("Security model not specified, local fs needs security model"); - error_printf("valid options are:" - "\tsecurity_model=[passthrough|mapped-xattr|mapped-file|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 { - error_report("Invalid security model %s specified", sec_model); - error_printf("valid options are:" - "\t[passthrough|mapped-xattr|mapped-file|none]\n"); - return -1; - } - - if (!path) { - error_report("fsdev: No path specified"); - 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, -}; |