1596 lines
42 KiB
C
1596 lines
42 KiB
C
/*
|
|
* 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-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>
|
|
#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
|
|
|
|
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;
|
|
renameat(odirfd, opath, ndirfd, npath);
|
|
errno = serrno;
|
|
}
|
|
|
|
static void unlinkat_preserve_errno(int dirfd, const char *path, int flags)
|
|
{
|
|
int serrno = errno;
|
|
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 = 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 = 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 (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;
|
|
}
|
|
do {
|
|
tsize = read(fd, (void *)buf, bufsz);
|
|
} while (tsize == -1 && errno == EINTR);
|
|
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;
|
|
}
|
|
|
|
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 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 *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 = 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 = 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 = 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 = 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_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.stream);
|
|
} 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)
|
|
{
|
|
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 cleint 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);
|
|
do {
|
|
write_size = write(fd, (void *)oldpath, oldpath_size);
|
|
} while (write_size == -1 && errno == EINTR);
|
|
close_preserve_errno(fd);
|
|
|
|
if (write_size != oldpath_size) {
|
|
goto err_end;
|
|
}
|
|
/* Set cleint 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 = 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_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 = utimensat(dirfd, name, buf, AT_SYMLINK_NOFOLLOW);
|
|
close_preserve_errno(dirfd);
|
|
out:
|
|
g_free(dirpath);
|
|
g_free(name);
|
|
return ret;
|
|
}
|
|
|
|
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 = 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 = unlinkat(map_dirfd, name, 0);
|
|
close_preserve_errno(map_dirfd);
|
|
if (ret < 0 && errno != ENOENT) {
|
|
return -1;
|
|
}
|
|
} else if (errno != ENOENT) {
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 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 (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;
|
|
|
|
if (fid_type == P9_FID_DIR) {
|
|
fd = dirfd(fs->dir.stream);
|
|
} 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)
|
|
{
|
|
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 = 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 = 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 = 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 definied
|
|
*/
|
|
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;
|
|
}
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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,
|
|
};
|