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Merge remote-tracking branch 'aneesh/for-upstream' into staging

Browse Source 
* aneesh/for-upstream:
  hw/9pfs: Remove O_NOATIME flag from 9pfs open() calls in readonly mode
  hw/9pfs: Update MAINTAINERS file
  fsdev: Fix parameter parsing for proxy helper
  hw/9pfs: Fix crash when mounting with synthfs
  hw/9pfs: Preserve S_ISGID
  hw/9pfs: Add new security model mapped-file.
This commit is contained in:
Anthony Liguori 2012-02-08 07:23:55 -06:00
commit dc717bfd05
8 changed files with 393 additions and 34 deletions
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12
fsdev/file-op-9p.h
View File

@ -56,11 +56,15 @@ typedef struct extended_ops {
* On failure ignore the error.
*/
#define V9FS_SM_NONE 0x00000010
#define V9FS_RDONLY 0x00000020
#define V9FS_PROXY_SOCK_FD 0x00000040
#define V9FS_PROXY_SOCK_NAME 0x00000080
/*
* uid/gid part of .virtfs_meatadata namespace
*/
#define V9FS_SM_MAPPED_FILE 0x00000020
#define V9FS_RDONLY 0x00000040
#define V9FS_PROXY_SOCK_FD 0x00000080
#define V9FS_PROXY_SOCK_NAME 0x00000100
#define V9FS_SEC_MASK 0x0000001C
#define V9FS_SEC_MASK 0x0000003C
typedef struct FileOperations FileOperations;

10
fsdev/virtfs-proxy-helper.c
View File

@ -1036,7 +1036,13 @@ int main(int argc, char **argv)
return -1;
}
if (*sock_name && (own_u == -1 || own_g == -1)) {
if (sock_name && sock != -1) {
fprintf(stderr, "both named socket and socket descriptor specified\n");
usage(argv[0]);
exit(EXIT_FAILURE);
}
if (sock_name && (own_u == -1 || own_g == -1)) {
fprintf(stderr, "owner uid:gid not specified, ");
fprintf(stderr,
"owner uid:gid specifies who can access the socket file\n");
@ -1064,7 +1070,7 @@ int main(int argc, char **argv)
}
do_log(LOG_INFO, "Started\n");
if (*sock_name) {
if (sock_name) {
sock = proxy_socket(sock_name, own_u, own_g);
if (sock < 0) {
goto error;

14
hw/9pfs/cofile.c
View File

@ -76,6 +76,20 @@ int v9fs_co_fstat(V9fsPDU *pdu, V9fsFidState *fidp, struct stat *stbuf)
err = -errno;
}
});
/*
* Some FS driver (local:mapped-file) can't support fetching attributes
* using file descriptor. Use Path name in that case.
*/
if (err == -EOPNOTSUPP) {
err = v9fs_co_lstat(pdu, &fidp->path, stbuf);
if (err == -ENOENT) {
/*
* fstat on an unlinked file. Work with partial results
* returned from s->ops->fstat
*/
err = 0;
}
}
return err;
}

9
hw/9pfs/virtio-9p-device.c
View File

@ -91,15 +91,6 @@ VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf *conf)
s->ctx.fs_root = NULL;
}
s->ctx.exops.get_st_gen = NULL;
if (fse->export_flags & V9FS_SM_PASSTHROUGH) {
s->ctx.xops = passthrough_xattr_ops;
} else if (fse->export_flags & V9FS_SM_MAPPED) {
s->ctx.xops = mapped_xattr_ops;
} else if (fse->export_flags & V9FS_SM_NONE) {
s->ctx.xops = none_xattr_ops;
}
len = strlen(conf->tag);
if (len > MAX_TAG_LEN - 1) {
fprintf(stderr, "mount tag '%s' (%d bytes) is longer than "

4
hw/9pfs/virtio-9p-handle.c
View File

@ -63,11 +63,11 @@ static int handle_update_file_cred(int dirfd, const char *name, FsCred *credp)
if (fd < 0) {
return fd;
}
ret = fchmod(fd, credp->fc_mode & 07777);
ret = fchownat(fd, "", credp->fc_uid, credp->fc_gid, AT_EMPTY_PATH);
if (ret < 0) {
goto err_out;
}
ret = fchownat(fd, "", credp->fc_uid, credp->fc_gid, AT_EMPTY_PATH);
ret = fchmod(fd, credp->fc_mode & 07777);
err_out:
close(fd);
return ret;

357
hw/9pfs/virtio-9p-local.c
View File

@ -20,6 +20,7 @@
#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>
@ -39,6 +40,54 @@
#define BTRFS_SUPER_MAGIC 0x9123683E
#endif
#define VIRTFS_META_DIR ".virtfs_metadata"
static const char *local_mapped_attr_path(FsContext *ctx,
const char *path, char *buffer)
{
char *dir_name;
char *tmp_path = strdup(path);
char *base_name = basename(tmp_path);
/* NULL terminate the directory */
dir_name = tmp_path;
*(base_name - 1) = '\0';
snprintf(buffer, PATH_MAX, "%s/%s/%s/%s",
ctx->fs_root, dir_name, VIRTFS_META_DIR, base_name);
free(tmp_path);
return buffer;
}
#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[PATH_MAX];
local_mapped_attr_path(ctx, path, attr_path);
fp = fopen(attr_path, "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;
@ -71,10 +120,103 @@ static int local_lstat(FsContext *fs_ctx, V9fsPath *fs_path, struct stat *stbuf)
sizeof(dev_t)) > 0) {
stbuf->st_rdev = tmp_dev;
}
} else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
local_mapped_file_attr(fs_ctx, path, stbuf);
}
return err;
}
static int local_create_mapped_attr_dir(FsContext *ctx, const char *path)
{
int err;
char attr_dir[PATH_MAX];
char *tmp_path = strdup(path);
snprintf(attr_dir, PATH_MAX, "%s/%s/%s",
ctx->fs_root, dirname(tmp_path), VIRTFS_META_DIR);
err = mkdir(attr_dir, 0700);
if (err < 0 && errno == EEXIST) {
err = 0;
}
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[PATH_MAX];
int uid = -1, gid = -1, mode = -1, rdev = -1;
fp = fopen(local_mapped_attr_path(ctx, path, 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 = 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:
return ret;
}
static int local_set_xattr(const char *path, FsCred *credp)
{
int err;
@ -115,9 +257,6 @@ static int local_post_create_passthrough(FsContext *fs_ctx, const char *path,
{
char buffer[PATH_MAX];
if (chmod(rpath(fs_ctx, path, buffer), credp->fc_mode & 07777) < 0) {
return -1;
}
if (lchown(rpath(fs_ctx, path, buffer), credp->fc_uid,
credp->fc_gid) < 0) {
/*
@ -128,6 +267,10 @@ static int local_post_create_passthrough(FsContext *fs_ctx, const char *path,
return -1;
}
}
if (chmod(rpath(fs_ctx, path, buffer), credp->fc_mode & 07777) < 0) {
return -1;
}
return 0;
}
@ -138,7 +281,8 @@ static ssize_t local_readlink(FsContext *fs_ctx, V9fsPath *fs_path,
char buffer[PATH_MAX];
char *path = fs_path->data;
if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
if ((fs_ctx->export_flags & V9FS_SM_MAPPED) ||
(fs_ctx->export_flags & V9FS_SM_MAPPED_FILE)) {
int fd;
fd = open(rpath(fs_ctx, path, buffer), O_RDONLY);
if (fd == -1) {
@ -203,7 +347,18 @@ static int local_readdir_r(FsContext *ctx, V9fsFidOpenState *fs,
struct dirent *entry,
struct dirent **result)
{
return readdir_r(fs->dir, entry, result);
int ret;
again:
ret = readdir_r(fs->dir, entry, result);
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;
}
}
return ret;
}
static void local_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off)
@ -264,6 +419,8 @@ static int local_chmod(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
return local_set_xattr(rpath(fs_ctx, path, buffer), credp);
} 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)) {
return chmod(rpath(fs_ctx, path, buffer), credp->fc_mode);
@ -296,6 +453,18 @@ static int local_mknod(FsContext *fs_ctx, V9fsPath *dir_path,
serrno = errno;
goto err_end;
}
} else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
err = mknod(rpath(fs_ctx, path, 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)) {
err = mknod(rpath(fs_ctx, path, buffer), credp->fc_mode,
@ -344,6 +513,17 @@ static int local_mkdir(FsContext *fs_ctx, V9fsPath *dir_path,
serrno = errno;
goto err_end;
}
} else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
err = mkdir(rpath(fs_ctx, path, 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)) {
err = mkdir(rpath(fs_ctx, path, buffer), credp->fc_mode);
@ -404,6 +584,9 @@ static int local_fstat(FsContext *fs_ctx, int fid_type,
&tmp_dev, sizeof(dev_t)) > 0) {
stbuf->st_rdev = tmp_dev;
}
} else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
errno = EOPNOTSUPP;
return -1;
}
return err;
}
@ -436,6 +619,19 @@ static int local_open2(FsContext *fs_ctx, V9fsPath *dir_path, const char *name,
serrno = errno;
goto err_end;
}
} else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
fd = open(rpath(fs_ctx, path, 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)) {
fd = open(rpath(fs_ctx, path, buffer), flags, credp->fc_mode);
@ -506,6 +702,35 @@ static int local_symlink(FsContext *fs_ctx, const char *oldpath,
serrno = errno;
goto err_end;
}
} else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
int fd;
ssize_t oldpath_size, write_size;
fd = open(rpath(fs_ctx, newpath, buffer), O_CREAT|O_EXCL|O_RDWR,
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)) {
err = symlink(oldpath, rpath(fs_ctx, newpath, buffer));
@ -548,6 +773,21 @@ static int local_link(FsContext *ctx, V9fsPath *oldpath,
ret = link(rpath(ctx, oldpath->data, buffer),
rpath(ctx, newpath.data, 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;
}
ret = link(local_mapped_attr_path(ctx, oldpath->data, buffer),
local_mapped_attr_path(ctx, newpath.data, buffer1));
if (ret < 0 && errno != ENOENT) {
goto err_out;
}
}
err_out:
v9fs_string_free(&newpath);
return ret;
}
@ -563,8 +803,21 @@ static int local_truncate(FsContext *ctx, V9fsPath *fs_path, off_t size)
static int local_rename(FsContext *ctx, const char *oldpath,
const char *newpath)
{
int err;
char buffer[PATH_MAX], buffer1[PATH_MAX];
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 */
err = rename(local_mapped_attr_path(ctx, oldpath, buffer),
local_mapped_attr_path(ctx, newpath, buffer1));
if (err < 0 && errno != ENOENT) {
return err;
}
}
return rename(rpath(ctx, oldpath, buffer), rpath(ctx, newpath, buffer1));
}
@ -580,6 +833,8 @@ static int local_chown(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
credp->fc_uid, credp->fc_gid);
} else if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
return local_set_xattr(rpath(fs_ctx, path, buffer), credp);
} else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
return local_set_mapped_file_attr(fs_ctx, path, credp);
}
return -1;
}
@ -595,8 +850,46 @@ static int local_utimensat(FsContext *s, V9fsPath *fs_path,
static int local_remove(FsContext *ctx, const char *path)
{
int err;
struct stat stbuf;
char buffer[PATH_MAX];
if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
err = lstat(rpath(ctx, path, buffer), &stbuf);
if (err) {
goto err_out;
}
/*
* If directory remove .virtfs_metadata contained in the
* directory
*/
if (S_ISDIR(stbuf.st_mode)) {
sprintf(buffer, "%s/%s/%s", ctx->fs_root, path, VIRTFS_META_DIR);
err = remove(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
*/
err = remove(local_mapped_attr_path(ctx, path, 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;
}
}
return remove(rpath(ctx, path, buffer));
err_out:
return err;
}
static int local_fsync(FsContext *ctx, int fid_type,
@ -696,12 +989,45 @@ static int local_unlinkat(FsContext *ctx, V9fsPath *dir,
int ret;
V9fsString fullname;
char buffer[PATH_MAX];
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
*/
sprintf(buffer, "%s/%s/%s", ctx->fs_root,
fullname.data, VIRTFS_META_DIR);
ret = remove(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.
*/
ret = remove(local_mapped_attr_path(ctx, fullname.data, 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 */
ret = remove(rpath(ctx, fullname.data, buffer));
v9fs_string_free(&fullname);
err_out:
return ret;
}
@ -736,6 +1062,19 @@ 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
/*
@ -770,13 +1109,17 @@ static int local_parse_opts(QemuOpts *opts, struct FsDriverEntry *fse)
if (!strcmp(sec_model, "passthrough")) {
fse->export_flags |= V9FS_SM_PASSTHROUGH;
} else if (!strcmp(sec_model, "mapped")) {
} 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|none]\n", sec_model);
"\n\t [passthrough|mapped-xattr|mapped-file|none]\n",
sec_model);
return -1;
}

3
hw/9pfs/virtio-9p.c
View File

@ -986,7 +986,7 @@ static void v9fs_attach(void *opaque)
s->root_fid = fid;
/* disable migration */
error_set(&s->migration_blocker, QERR_VIRTFS_FEATURE_BLOCKS_MIGRATION,
s->ctx.fs_root, s->tag);
s->ctx.fs_root ? s->ctx.fs_root : "NULL", s->tag);
migrate_add_blocker(s->migration_blocker);
out:
put_fid(pdu, fidp);
@ -1391,7 +1391,6 @@ static void v9fs_open(void *opaque)
err = -EROFS;
goto out;
}
flags |= O_NOATIME;
}
err = v9fs_co_open(pdu, fidp, flags);
if (err < 0) {

18
qemu-options.hx
View File

@ -554,7 +554,7 @@ DEFHEADING()
DEFHEADING(File system options:)
DEF("fsdev", HAS_ARG, QEMU_OPTION_fsdev,
"-fsdev fsdriver,id=id[,path=path,][security_model={mapped|passthrough|none}]\n"
"-fsdev fsdriver,id=id[,path=path,][security_model={mapped-xattr|mapped-file|passthrough|none}]\n"
" [,writeout=immediate][,readonly][,socket=socket|sock_fd=sock_fd]\n",
QEMU_ARCH_ALL)
@ -574,12 +574,13 @@ Specifies the export path for the file system device. Files under
this path will be available to the 9p client on the guest.
@item security_model=@var{security_model}
Specifies the security model to be used for this export path.
Supported security models are "passthrough", "mapped" and "none".
Supported security models are "passthrough", "mapped-xattr", "mapped-file" and "none".
In "passthrough" security model, files are stored using the same
credentials as they are created on the guest. This requires qemu
to run as root. In "mapped" security model, some of the file
to run as root. In "mapped-xattr" security model, some of the file
attributes like uid, gid, mode bits and link target are stored as
file attributes. Directories exported by this security model cannot
file attributes. For "mapped-file" these attributes are stored in the
hidden .virtfs_metadata directory. Directories exported by this security model cannot
interact with other unix tools. "none" security model is same as
passthrough except the sever won't report failures if it fails to
set file attributes like ownership. Security model is mandatory
@ -619,7 +620,7 @@ DEFHEADING()
DEFHEADING(Virtual File system pass-through options:)
DEF("virtfs", HAS_ARG, QEMU_OPTION_virtfs,
"-virtfs local,path=path,mount_tag=tag,security_model=[mapped|passthrough|none]\n"
"-virtfs local,path=path,mount_tag=tag,security_model=[mapped-xattr|mapped-file|passthrough|none]\n"
" [,writeout=immediate][,readonly][,socket=socket|sock_fd=sock_fd]\n",
QEMU_ARCH_ALL)
@ -640,12 +641,13 @@ Specifies the export path for the file system device. Files under
this path will be available to the 9p client on the guest.
@item security_model=@var{security_model}
Specifies the security model to be used for this export path.
Supported security models are "passthrough", "mapped" and "none".
Supported security models are "passthrough", "mapped-xattr", "mapped-file" and "none".
In "passthrough" security model, files are stored using the same
credentials as they are created on the guest. This requires qemu
to run as root. In "mapped" security model, some of the file
to run as root. In "mapped-xattr" security model, some of the file
attributes like uid, gid, mode bits and link target are stored as
file attributes. Directories exported by this security model cannot
file attributes. For "mapped-file" these attributes are stored in the
hidden .virtfs_metadata directory. Directories exported by this security model cannot
interact with other unix tools. "none" security model is same as
passthrough except the sever won't report failures if it fails to
set file attributes like ownership. Security model is mandatory only