+++ /dev/null
-/*
- * Virtio 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 "hw/virtio/virtio.h"
-#include "virtio-9p.h"
-#include "virtio-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 <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) {
- 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,
-};
Code Review / kvmfornfv.git / blobdiff