+++ /dev/null
-/*
- * Virtio 9p handle callback
- *
- * Copyright IBM, Corp. 2011
- *
- * Authors:
- * Aneesh Kumar K.V <aneesh.kumar@linux.vnet.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 <arpa/inet.h>
-#include <pwd.h>
-#include <grp.h>
-#include <sys/socket.h>
-#include <sys/un.h>
-#include "qemu/xattr.h"
-#include <unistd.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
-
-struct handle_data {
- int mountfd;
- int handle_bytes;
-};
-
-static inline int name_to_handle(int dirfd, const char *name,
- struct file_handle *fh, int *mnt_id, int flags)
-{
- return name_to_handle_at(dirfd, name, fh, mnt_id, flags);
-}
-
-static inline int open_by_handle(int mountfd, const char *fh, int flags)
-{
- return open_by_handle_at(mountfd, (struct file_handle *)fh, flags);
-}
-
-static int handle_update_file_cred(int dirfd, const char *name, FsCred *credp)
-{
- int fd, ret;
- fd = openat(dirfd, name, O_NONBLOCK | O_NOFOLLOW);
- if (fd < 0) {
- return fd;
- }
- ret = fchownat(fd, "", credp->fc_uid, credp->fc_gid, AT_EMPTY_PATH);
- if (ret < 0) {
- goto err_out;
- }
- ret = fchmod(fd, credp->fc_mode & 07777);
-err_out:
- close(fd);
- return ret;
-}
-
-
-static int handle_lstat(FsContext *fs_ctx, V9fsPath *fs_path,
- struct stat *stbuf)
-{
- int fd, ret;
- struct handle_data *data = (struct handle_data *)fs_ctx->private;
-
- fd = open_by_handle(data->mountfd, fs_path->data, O_PATH);
- if (fd < 0) {
- return fd;
- }
- ret = fstatat(fd, "", stbuf, AT_EMPTY_PATH);
- close(fd);
- return ret;
-}
-
-static ssize_t handle_readlink(FsContext *fs_ctx, V9fsPath *fs_path,
- char *buf, size_t bufsz)
-{
- int fd, ret;
- struct handle_data *data = (struct handle_data *)fs_ctx->private;
-
- fd = open_by_handle(data->mountfd, fs_path->data, O_PATH);
- if (fd < 0) {
- return fd;
- }
- ret = readlinkat(fd, "", buf, bufsz);
- close(fd);
- return ret;
-}
-
-static int handle_close(FsContext *ctx, V9fsFidOpenState *fs)
-{
- return close(fs->fd);
-}
-
-static int handle_closedir(FsContext *ctx, V9fsFidOpenState *fs)
-{
- return closedir(fs->dir);
-}
-
-static int handle_open(FsContext *ctx, V9fsPath *fs_path,
- int flags, V9fsFidOpenState *fs)
-{
- struct handle_data *data = (struct handle_data *)ctx->private;
-
- fs->fd = open_by_handle(data->mountfd, fs_path->data, flags);
- return fs->fd;
-}
-
-static int handle_opendir(FsContext *ctx,
- V9fsPath *fs_path, V9fsFidOpenState *fs)
-{
- int ret;
- ret = handle_open(ctx, fs_path, O_DIRECTORY, fs);
- if (ret < 0) {
- return -1;
- }
- fs->dir = fdopendir(ret);
- if (!fs->dir) {
- return -1;
- }
- return 0;
-}
-
-static void handle_rewinddir(FsContext *ctx, V9fsFidOpenState *fs)
-{
- rewinddir(fs->dir);
-}
-
-static off_t handle_telldir(FsContext *ctx, V9fsFidOpenState *fs)
-{
- return telldir(fs->dir);
-}
-
-static int handle_readdir_r(FsContext *ctx, V9fsFidOpenState *fs,
- struct dirent *entry,
- struct dirent **result)
-{
- return readdir_r(fs->dir, entry, result);
-}
-
-static void handle_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off)
-{
- seekdir(fs->dir, off);
-}
-
-static ssize_t handle_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 handle_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 handle_chmod(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
-{
- int fd, ret;
- struct handle_data *data = (struct handle_data *)fs_ctx->private;
-
- fd = open_by_handle(data->mountfd, fs_path->data, O_NONBLOCK);
- if (fd < 0) {
- return fd;
- }
- ret = fchmod(fd, credp->fc_mode);
- close(fd);
- return ret;
-}
-
-static int handle_mknod(FsContext *fs_ctx, V9fsPath *dir_path,
- const char *name, FsCred *credp)
-{
- int dirfd, ret;
- struct handle_data *data = (struct handle_data *)fs_ctx->private;
-
- dirfd = open_by_handle(data->mountfd, dir_path->data, O_PATH);
- if (dirfd < 0) {
- return dirfd;
- }
- ret = mknodat(dirfd, name, credp->fc_mode, credp->fc_rdev);
- if (!ret) {
- ret = handle_update_file_cred(dirfd, name, credp);
- }
- close(dirfd);
- return ret;
-}
-
-static int handle_mkdir(FsContext *fs_ctx, V9fsPath *dir_path,
- const char *name, FsCred *credp)
-{
- int dirfd, ret;
- struct handle_data *data = (struct handle_data *)fs_ctx->private;
-
- dirfd = open_by_handle(data->mountfd, dir_path->data, O_PATH);
- if (dirfd < 0) {
- return dirfd;
- }
- ret = mkdirat(dirfd, name, credp->fc_mode);
- if (!ret) {
- ret = handle_update_file_cred(dirfd, name, credp);
- }
- close(dirfd);
- return ret;
-}
-
-static int handle_fstat(FsContext *fs_ctx, int fid_type,
- V9fsFidOpenState *fs, struct stat *stbuf)
-{
- int fd;
-
- if (fid_type == P9_FID_DIR) {
- fd = dirfd(fs->dir);
- } else {
- fd = fs->fd;
- }
- return fstat(fd, stbuf);
-}
-
-static int handle_open2(FsContext *fs_ctx, V9fsPath *dir_path, const char *name,
- int flags, FsCred *credp, V9fsFidOpenState *fs)
-{
- int ret;
- int dirfd, fd;
- struct handle_data *data = (struct handle_data *)fs_ctx->private;
-
- dirfd = open_by_handle(data->mountfd, dir_path->data, O_PATH);
- if (dirfd < 0) {
- return dirfd;
- }
- fd = openat(dirfd, name, flags | O_NOFOLLOW, credp->fc_mode);
- if (fd >= 0) {
- ret = handle_update_file_cred(dirfd, name, credp);
- if (ret < 0) {
- close(fd);
- fd = ret;
- } else {
- fs->fd = fd;
- }
- }
- close(dirfd);
- return fd;
-}
-
-
-static int handle_symlink(FsContext *fs_ctx, const char *oldpath,
- V9fsPath *dir_path, const char *name, FsCred *credp)
-{
- int fd, dirfd, ret;
- struct handle_data *data = (struct handle_data *)fs_ctx->private;
-
- dirfd = open_by_handle(data->mountfd, dir_path->data, O_PATH);
- if (dirfd < 0) {
- return dirfd;
- }
- ret = symlinkat(oldpath, dirfd, name);
- if (!ret) {
- fd = openat(dirfd, name, O_PATH | O_NOFOLLOW);
- if (fd < 0) {
- ret = fd;
- goto err_out;
- }
- ret = fchownat(fd, "", credp->fc_uid, credp->fc_gid, AT_EMPTY_PATH);
- close(fd);
- }
-err_out:
- close(dirfd);
- return ret;
-}
-
-static int handle_link(FsContext *ctx, V9fsPath *oldpath,
- V9fsPath *dirpath, const char *name)
-{
- int oldfd, newdirfd, ret;
- struct handle_data *data = (struct handle_data *)ctx->private;
-
- oldfd = open_by_handle(data->mountfd, oldpath->data, O_PATH);
- if (oldfd < 0) {
- return oldfd;
- }
- newdirfd = open_by_handle(data->mountfd, dirpath->data, O_PATH);
- if (newdirfd < 0) {
- close(oldfd);
- return newdirfd;
- }
- ret = linkat(oldfd, "", newdirfd, name, AT_EMPTY_PATH);
- close(newdirfd);
- close(oldfd);
- return ret;
-}
-
-static int handle_truncate(FsContext *ctx, V9fsPath *fs_path, off_t size)
-{
- int fd, ret;
- struct handle_data *data = (struct handle_data *)ctx->private;
-
- fd = open_by_handle(data->mountfd, fs_path->data, O_NONBLOCK | O_WRONLY);
- if (fd < 0) {
- return fd;
- }
- ret = ftruncate(fd, size);
- close(fd);
- return ret;
-}
-
-static int handle_rename(FsContext *ctx, const char *oldpath,
- const char *newpath)
-{
- errno = EOPNOTSUPP;
- return -1;
-}
-
-static int handle_chown(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
-{
- int fd, ret;
- struct handle_data *data = (struct handle_data *)fs_ctx->private;
-
- fd = open_by_handle(data->mountfd, fs_path->data, O_PATH);
- if (fd < 0) {
- return fd;
- }
- ret = fchownat(fd, "", credp->fc_uid, credp->fc_gid, AT_EMPTY_PATH);
- close(fd);
- return ret;
-}
-
-static int handle_utimensat(FsContext *ctx, V9fsPath *fs_path,
- const struct timespec *buf)
-{
- int ret;
-#ifdef CONFIG_UTIMENSAT
- int fd;
- struct handle_data *data = (struct handle_data *)ctx->private;
-
- fd = open_by_handle(data->mountfd, fs_path->data, O_NONBLOCK);
- if (fd < 0) {
- return fd;
- }
- ret = futimens(fd, buf);
- close(fd);
-#else
- ret = -1;
- errno = ENOSYS;
-#endif
- return ret;
-}
-
-static int handle_remove(FsContext *ctx, const char *path)
-{
- errno = EOPNOTSUPP;
- return -1;
-}
-
-static int handle_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 handle_statfs(FsContext *ctx, V9fsPath *fs_path,
- struct statfs *stbuf)
-{
- int fd, ret;
- struct handle_data *data = (struct handle_data *)ctx->private;
-
- fd = open_by_handle(data->mountfd, fs_path->data, O_NONBLOCK);
- if (fd < 0) {
- return fd;
- }
- ret = fstatfs(fd, stbuf);
- close(fd);
- return ret;
-}
-
-static ssize_t handle_lgetxattr(FsContext *ctx, V9fsPath *fs_path,
- const char *name, void *value, size_t size)
-{
- int fd, ret;
- struct handle_data *data = (struct handle_data *)ctx->private;
-
- fd = open_by_handle(data->mountfd, fs_path->data, O_NONBLOCK);
- if (fd < 0) {
- return fd;
- }
- ret = fgetxattr(fd, name, value, size);
- close(fd);
- return ret;
-}
-
-static ssize_t handle_llistxattr(FsContext *ctx, V9fsPath *fs_path,
- void *value, size_t size)
-{
- int fd, ret;
- struct handle_data *data = (struct handle_data *)ctx->private;
-
- fd = open_by_handle(data->mountfd, fs_path->data, O_NONBLOCK);
- if (fd < 0) {
- return fd;
- }
- ret = flistxattr(fd, value, size);
- close(fd);
- return ret;
-}
-
-static int handle_lsetxattr(FsContext *ctx, V9fsPath *fs_path, const char *name,
- void *value, size_t size, int flags)
-{
- int fd, ret;
- struct handle_data *data = (struct handle_data *)ctx->private;
-
- fd = open_by_handle(data->mountfd, fs_path->data, O_NONBLOCK);
- if (fd < 0) {
- return fd;
- }
- ret = fsetxattr(fd, name, value, size, flags);
- close(fd);
- return ret;
-}
-
-static int handle_lremovexattr(FsContext *ctx, V9fsPath *fs_path,
- const char *name)
-{
- int fd, ret;
- struct handle_data *data = (struct handle_data *)ctx->private;
-
- fd = open_by_handle(data->mountfd, fs_path->data, O_NONBLOCK);
- if (fd < 0) {
- return fd;
- }
- ret = fremovexattr(fd, name);
- close(fd);
- return ret;
-}
-
-static int handle_name_to_path(FsContext *ctx, V9fsPath *dir_path,
- const char *name, V9fsPath *target)
-{
- char *buffer;
- struct file_handle *fh;
- int dirfd, ret, mnt_id;
- struct handle_data *data = (struct handle_data *)ctx->private;
-
- /* "." and ".." are not allowed */
- if (!strcmp(name, ".") || !strcmp(name, "..")) {
- errno = EINVAL;
- return -1;
-
- }
- if (dir_path) {
- dirfd = open_by_handle(data->mountfd, dir_path->data, O_PATH);
- } else {
- /* relative to export root */
- buffer = rpath(ctx, ".");
- dirfd = open(buffer, O_DIRECTORY);
- g_free(buffer);
- }
- if (dirfd < 0) {
- return dirfd;
- }
- fh = g_malloc(sizeof(struct file_handle) + data->handle_bytes);
- fh->handle_bytes = data->handle_bytes;
- /* add a "./" at the beginning of the path */
- buffer = g_strdup_printf("./%s", name);
- /* flag = 0 imply don't follow symlink */
- ret = name_to_handle(dirfd, buffer, fh, &mnt_id, 0);
- if (!ret) {
- target->data = (char *)fh;
- target->size = sizeof(struct file_handle) + data->handle_bytes;
- } else {
- g_free(fh);
- }
- close(dirfd);
- g_free(buffer);
- return ret;
-}
-
-static int handle_renameat(FsContext *ctx, V9fsPath *olddir,
- const char *old_name, V9fsPath *newdir,
- const char *new_name)
-{
- int olddirfd, newdirfd, ret;
- struct handle_data *data = (struct handle_data *)ctx->private;
-
- olddirfd = open_by_handle(data->mountfd, olddir->data, O_PATH);
- if (olddirfd < 0) {
- return olddirfd;
- }
- newdirfd = open_by_handle(data->mountfd, newdir->data, O_PATH);
- if (newdirfd < 0) {
- close(olddirfd);
- return newdirfd;
- }
- ret = renameat(olddirfd, old_name, newdirfd, new_name);
- close(newdirfd);
- close(olddirfd);
- return ret;
-}
-
-static int handle_unlinkat(FsContext *ctx, V9fsPath *dir,
- const char *name, int flags)
-{
- int dirfd, ret;
- struct handle_data *data = (struct handle_data *)ctx->private;
- int rflags;
-
- dirfd = open_by_handle(data->mountfd, dir->data, O_PATH);
- if (dirfd < 0) {
- return dirfd;
- }
-
- rflags = 0;
- if (flags & P9_DOTL_AT_REMOVEDIR) {
- rflags |= AT_REMOVEDIR;
- }
-
- ret = unlinkat(dirfd, name, rflags);
-
- close(dirfd);
- return ret;
-}
-
-static int handle_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 = handle_open(ctx, path, O_RDONLY, &fid_open);
- if (err < 0) {
- return err;
- }
- err = ioctl(fid_open.fd, FS_IOC_GETVERSION, st_gen);
- handle_close(ctx, &fid_open);
- return err;
-#else
- errno = ENOTTY;
- return -1;
-#endif
-}
-
-static int handle_init(FsContext *ctx)
-{
- int ret, mnt_id;
- struct statfs stbuf;
- struct file_handle fh;
- struct handle_data *data = g_malloc(sizeof(struct handle_data));
-
- data->mountfd = open(ctx->fs_root, O_DIRECTORY);
- if (data->mountfd < 0) {
- ret = data->mountfd;
- goto err_out;
- }
- ret = statfs(ctx->fs_root, &stbuf);
- if (!ret) {
- 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 = handle_ioc_getversion;
- break;
- }
- }
- memset(&fh, 0, sizeof(struct file_handle));
- ret = name_to_handle(data->mountfd, ".", &fh, &mnt_id, 0);
- if (ret && errno == EOVERFLOW) {
- data->handle_bytes = fh.handle_bytes;
- ctx->private = data;
- ret = 0;
- goto out;
- }
- /* we got 0 byte handle ? */
- ret = -1;
- close(data->mountfd);
-err_out:
- g_free(data);
-out:
- return ret;
-}
-
-static int handle_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, "Invalid argument security_model specified with handle fsdriver\n");
- return -1;
- }
-
- if (!path) {
- fprintf(stderr, "fsdev: No path specified.\n");
- return -1;
- }
- fse->path = g_strdup(path);
- return 0;
-
-}
-
-FileOperations handle_ops = {
- .parse_opts = handle_parse_opts,
- .init = handle_init,
- .lstat = handle_lstat,
- .readlink = handle_readlink,
- .close = handle_close,
- .closedir = handle_closedir,
- .open = handle_open,
- .opendir = handle_opendir,
- .rewinddir = handle_rewinddir,
- .telldir = handle_telldir,
- .readdir_r = handle_readdir_r,
- .seekdir = handle_seekdir,
- .preadv = handle_preadv,
- .pwritev = handle_pwritev,
- .chmod = handle_chmod,
- .mknod = handle_mknod,
- .mkdir = handle_mkdir,
- .fstat = handle_fstat,
- .open2 = handle_open2,
- .symlink = handle_symlink,
- .link = handle_link,
- .truncate = handle_truncate,
- .rename = handle_rename,
- .chown = handle_chown,
- .utimensat = handle_utimensat,
- .remove = handle_remove,
- .fsync = handle_fsync,
- .statfs = handle_statfs,
- .lgetxattr = handle_lgetxattr,
- .llistxattr = handle_llistxattr,
- .lsetxattr = handle_lsetxattr,
- .lremovexattr = handle_lremovexattr,
- .name_to_path = handle_name_to_path,
- .renameat = handle_renameat,
- .unlinkat = handle_unlinkat,
-};
Code Review / kvmfornfv.git / blobdiff