hw/virtio-9p-local.c - third_party/qemu - Git at Google

 /*
  * 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 "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 <attr/xattr.h>


 static int local_lstat(FsContext *fs_ctx, const char *path, struct stat *stbuf)
 {
     int err;
     err =  lstat(rpath(fs_ctx, path), stbuf);
     if (err) {
         return err;
     }
     if (fs_ctx->fs_sm == 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(rpath(fs_ctx, path), "user.virtfs.uid", &tmp_uid,
                     sizeof(uid_t)) > 0) {
             stbuf->st_uid = tmp_uid;
         }
         if (getxattr(rpath(fs_ctx, path), "user.virtfs.gid", &tmp_gid,
                     sizeof(gid_t)) > 0) {
             stbuf->st_gid = tmp_gid;
         }
         if (getxattr(rpath(fs_ctx, path), "user.virtfs.mode", &tmp_mode,
                     sizeof(mode_t)) > 0) {
             stbuf->st_mode = tmp_mode;
         }
         if (getxattr(rpath(fs_ctx, path), "user.virtfs.rdev", &tmp_dev,
                         sizeof(dev_t)) > 0) {
                 stbuf->st_rdev = tmp_dev;
         }
     }
     return err;
 }

 static int local_set_xattr(const char *path, FsCred *credp)
 {
     int err;
     if (credp->fc_uid != -1) {
         err = setxattr(path, "user.virtfs.uid", &credp->fc_uid, sizeof(uid_t),
                 0);
         if (err) {
             return err;
         }
     }
     if (credp->fc_gid != -1) {
         err = setxattr(path, "user.virtfs.gid", &credp->fc_gid, sizeof(gid_t),
                 0);
         if (err) {
             return err;
         }
     }
     if (credp->fc_mode != -1) {
         err = setxattr(path, "user.virtfs.mode", &credp->fc_mode,
                 sizeof(mode_t), 0);
         if (err) {
             return err;
         }
     }
     if (credp->fc_rdev != -1) {
         err = setxattr(path, "user.virtfs.rdev", &credp->fc_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)
 {
     if (chmod(rpath(fs_ctx, path), credp->fc_mode & 07777) < 0) {
         return -1;
     }
     if (lchown(rpath(fs_ctx, path), 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->fs_sm != SM_NONE) {
             return -1;
         }
     }
     return 0;
 }

 static ssize_t local_readlink(FsContext *fs_ctx, const char *path,
         char *buf, size_t bufsz)
 {
     ssize_t tsize = -1;
     if (fs_ctx->fs_sm == SM_MAPPED) {
         int fd;
         fd = open(rpath(fs_ctx, path), O_RDONLY);
         if (fd == -1) {
             return -1;
         }
         do {
             tsize = read(fd, (void *)buf, bufsz);
         } while (tsize == -1 && errno == EINTR);
         close(fd);
         return tsize;
     } else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) ||
                (fs_ctx->fs_sm == SM_NONE)) {
         tsize = readlink(rpath(fs_ctx, path), buf, bufsz);
     }
     return tsize;
 }

 static int local_close(FsContext *ctx, int fd)
 {
     return close(fd);
 }

 static int local_closedir(FsContext *ctx, DIR *dir)
 {
     return closedir(dir);
 }

 static int local_open(FsContext *ctx, const char *path, int flags)
 {
     return open(rpath(ctx, path), flags);
 }

 static DIR *local_opendir(FsContext *ctx, const char *path)
 {
     return opendir(rpath(ctx, path));
 }

 static void local_rewinddir(FsContext *ctx, DIR *dir)
 {
     return rewinddir(dir);
 }

 static off_t local_telldir(FsContext *ctx, DIR *dir)
 {
     return telldir(dir);
 }

 static struct dirent *local_readdir(FsContext *ctx, DIR *dir)
 {
     return readdir(dir);
 }

 static void local_seekdir(FsContext *ctx, DIR *dir, off_t off)
 {
     return seekdir(dir, off);
 }

 static ssize_t local_preadv(FsContext *ctx, int fd, const struct iovec *iov,
                             int iovcnt, off_t offset)
 {
 #ifdef CONFIG_PREADV
     return preadv(fd, iov, iovcnt, offset);
 #else
     int err = lseek(fd, offset, SEEK_SET);
     if (err == -1) {
         return err;
     } else {
         return readv(fd, iov, iovcnt);
     }
 #endif
 }

 static ssize_t local_pwritev(FsContext *ctx, int fd, const struct iovec *iov,
                             int iovcnt, off_t offset)
 {
 #ifdef CONFIG_PREADV
     return pwritev(fd, iov, iovcnt, offset);
 #else
     int err = lseek(fd, offset, SEEK_SET);
     if (err == -1) {
         return err;
     } else {
         return writev(fd, iov, iovcnt);
     }
 #endif
 }

 static int local_chmod(FsContext *fs_ctx, const char *path, FsCred *credp)
 {
     if (fs_ctx->fs_sm == SM_MAPPED) {
         return local_set_xattr(rpath(fs_ctx, path), credp);
     } else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) ||
                (fs_ctx->fs_sm == SM_NONE)) {
         return chmod(rpath(fs_ctx, path), credp->fc_mode);
     }
     return -1;
 }

 static int local_mknod(FsContext *fs_ctx, const char *path, FsCred *credp)
 {
     int err = -1;
     int serrno = 0;

     /* Determine the security model */
     if (fs_ctx->fs_sm == SM_MAPPED) {
         err = mknod(rpath(fs_ctx, path), SM_LOCAL_MODE_BITS|S_IFREG, 0);
         if (err == -1) {
             return err;
         }
         local_set_xattr(rpath(fs_ctx, path), credp);
         if (err == -1) {
             serrno = errno;
             goto err_end;
         }
     } else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) ||
                (fs_ctx->fs_sm == SM_NONE)) {
         err = mknod(rpath(fs_ctx, path), credp->fc_mode, credp->fc_rdev);
         if (err == -1) {
             return err;
         }
         err = local_post_create_passthrough(fs_ctx, path, credp);
         if (err == -1) {
             serrno = errno;
             goto err_end;
         }
     }
     return err;

 err_end:
     remove(rpath(fs_ctx, path));
     errno = serrno;
     return err;
 }

 static int local_mkdir(FsContext *fs_ctx, const char *path, FsCred *credp)
 {
     int err = -1;
     int serrno = 0;

     /* Determine the security model */
     if (fs_ctx->fs_sm == SM_MAPPED) {
         err = mkdir(rpath(fs_ctx, path), SM_LOCAL_DIR_MODE_BITS);
         if (err == -1) {
             return err;
         }
         credp->fc_mode = credp->fc_mode|S_IFDIR;
         err = local_set_xattr(rpath(fs_ctx, path), credp);
         if (err == -1) {
             serrno = errno;
             goto err_end;
         }
     } else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) ||
                (fs_ctx->fs_sm == SM_NONE)) {
         err = mkdir(rpath(fs_ctx, path), credp->fc_mode);
         if (err == -1) {
             return err;
         }
         err = local_post_create_passthrough(fs_ctx, path, credp);
         if (err == -1) {
             serrno = errno;
             goto err_end;
         }
     }
     return err;

 err_end:
     remove(rpath(fs_ctx, path));
     errno = serrno;
     return err;
 }

 static int local_fstat(FsContext *fs_ctx, int fd, struct stat *stbuf)
 {
     int err;
     err = fstat(fd, stbuf);
     if (err) {
         return err;
     }
     if (fs_ctx->fs_sm == 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 = tmp_uid;
         }
         if (fgetxattr(fd, "user.virtfs.gid", &tmp_gid, sizeof(gid_t)) > 0) {
             stbuf->st_gid = tmp_gid;
         }
         if (fgetxattr(fd, "user.virtfs.mode", &tmp_mode, sizeof(mode_t)) > 0) {
             stbuf->st_mode = tmp_mode;
         }
         if (fgetxattr(fd, "user.virtfs.rdev", &tmp_dev, sizeof(dev_t)) > 0) {
                 stbuf->st_rdev = tmp_dev;
         }
     }
     return err;
 }

 static int local_open2(FsContext *fs_ctx, const char *path, int flags,
         FsCred *credp)
 {
     int fd = -1;
     int err = -1;
     int serrno = 0;

     /* Determine the security model */
     if (fs_ctx->fs_sm == SM_MAPPED) {
         fd = open(rpath(fs_ctx, path), flags, SM_LOCAL_MODE_BITS);
         if (fd == -1) {
             return fd;
         }
         credp->fc_mode = credp->fc_mode|S_IFREG;
         /* Set cleint credentials in xattr */
         err = local_set_xattr(rpath(fs_ctx, path), credp);
         if (err == -1) {
             serrno = errno;
             goto err_end;
         }
     } else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) ||
                (fs_ctx->fs_sm == SM_NONE)) {
         fd = open(rpath(fs_ctx, path), flags, credp->fc_mode);
         if (fd == -1) {
             return fd;
         }
         err = local_post_create_passthrough(fs_ctx, path, credp);
         if (err == -1) {
             serrno = errno;
             goto err_end;
         }
     }
     return fd;

 err_end:
     close(fd);
     remove(rpath(fs_ctx, path));
     errno = serrno;
     return err;
 }


 static int local_symlink(FsContext *fs_ctx, const char *oldpath,
         const char *newpath, FsCred *credp)
 {
     int err = -1;
     int serrno = 0;

     /* Determine the security model */
     if (fs_ctx->fs_sm == SM_MAPPED) {
         int fd;
         ssize_t oldpath_size, write_size;
         fd = open(rpath(fs_ctx, newpath), O_CREAT|O_EXCL|O_RDWR,
                 SM_LOCAL_MODE_BITS);
         if (fd == -1) {
             return fd;
         }
         /* Write the oldpath (target) to the file. */
         oldpath_size = strlen(oldpath) + 1;
         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(rpath(fs_ctx, newpath), credp);
         if (err == -1) {
             serrno = errno;
             goto err_end;
         }
     } else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) ||
                (fs_ctx->fs_sm == SM_NONE)) {
         err = symlink(oldpath, rpath(fs_ctx, newpath));
         if (err) {
             return err;
         }
         err = lchown(rpath(fs_ctx, newpath), 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->fs_sm != SM_NONE) {
                 serrno = errno;
                 goto err_end;
             } else
                 err = 0;
         }
     }
     return err;

 err_end:
     remove(rpath(fs_ctx, newpath));
     errno = serrno;
     return err;
 }

 static int local_link(FsContext *ctx, const char *oldpath, const char *newpath)
 {
     char *tmp = qemu_strdup(rpath(ctx, oldpath));
     int err, serrno = 0;

     if (tmp == NULL) {
         return -ENOMEM;
     }

     err = link(tmp, rpath(ctx, newpath));
     if (err == -1) {
         serrno = errno;
     }

     qemu_free(tmp);

     if (err == -1) {
         errno = serrno;
     }

     return err;
 }

 static int local_truncate(FsContext *ctx, const char *path, off_t size)
 {
     return truncate(rpath(ctx, path), size);
 }

 static int local_rename(FsContext *ctx, const char *oldpath,
                         const char *newpath)
 {
     char *tmp;
     int err;

     tmp = qemu_strdup(rpath(ctx, oldpath));

     err = rename(tmp, rpath(ctx, newpath));
     if (err == -1) {
         int serrno = errno;
         qemu_free(tmp);
         errno = serrno;
     } else {
         qemu_free(tmp);
     }

     return err;

 }

 static int local_chown(FsContext *fs_ctx, const char *path, FsCred *credp)
 {
     if ((credp->fc_uid == -1 && credp->fc_gid == -1) ||
             (fs_ctx->fs_sm == SM_PASSTHROUGH)) {
         return lchown(rpath(fs_ctx, path), credp->fc_uid, credp->fc_gid);
     } else if (fs_ctx->fs_sm == SM_MAPPED) {
         return local_set_xattr(rpath(fs_ctx, path), credp);
     } else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) ||
                (fs_ctx->fs_sm == SM_NONE)) {
         return lchown(rpath(fs_ctx, path), credp->fc_uid, credp->fc_gid);
     }
     return -1;
 }

 static int local_utimensat(FsContext *s, const char *path,
                            const struct timespec *buf)
 {
     return qemu_utimensat(AT_FDCWD, rpath(s, path), buf, AT_SYMLINK_NOFOLLOW);
 }

 static int local_remove(FsContext *ctx, const char *path)
 {
     return remove(rpath(ctx, path));
 }

 static int local_fsync(FsContext *ctx, int fd, int datasync)
 {
     if (datasync) {
         return qemu_fdatasync(fd);
     } else {
         return fsync(fd);
     }
 }

 static int local_statfs(FsContext *s, const char *path, struct statfs *stbuf)
 {
    return statfs(rpath(s, path), stbuf);
 }

 static ssize_t local_lgetxattr(FsContext *ctx, const char *path,
                                const char *name, void *value, size_t size)
 {
     return v9fs_get_xattr(ctx, path, name, value, size);
 }

 static ssize_t local_llistxattr(FsContext *ctx, const char *path,
                                 void *value, size_t size)
 {
     return v9fs_list_xattr(ctx, path, value, size);
 }

 static int local_lsetxattr(FsContext *ctx, const char *path, const char *name,
                            void *value, size_t size, int flags)
 {
     return v9fs_set_xattr(ctx, path, name, value, size, flags);
 }

 static int local_lremovexattr(FsContext *ctx,
                               const char *path, const char *name)
 {
     return v9fs_remove_xattr(ctx, path, name);
 }


 FileOperations local_ops = {
     .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,
 };
	/*
	* 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 "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 <attr/xattr.h>


	static int local_lstat(FsContext fs_ctx, const char path, struct stat *stbuf)
	{
	int err;
	err = lstat(rpath(fs_ctx, path), stbuf);
	if (err) {
	return err;
	}
	if (fs_ctx->fs_sm == 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(rpath(fs_ctx, path), "user.virtfs.uid", &tmp_uid,
	sizeof(uid_t)) > 0) {
	stbuf->st_uid = tmp_uid;
	}
	if (getxattr(rpath(fs_ctx, path), "user.virtfs.gid", &tmp_gid,
	sizeof(gid_t)) > 0) {
	stbuf->st_gid = tmp_gid;
	}
	if (getxattr(rpath(fs_ctx, path), "user.virtfs.mode", &tmp_mode,
	sizeof(mode_t)) > 0) {
	stbuf->st_mode = tmp_mode;
	}
	if (getxattr(rpath(fs_ctx, path), "user.virtfs.rdev", &tmp_dev,
	sizeof(dev_t)) > 0) {
	stbuf->st_rdev = tmp_dev;
	}
	}
	return err;
	}

	static int local_set_xattr(const char path, FsCred credp)
	{
	int err;
	if (credp->fc_uid != -1) {
	err = setxattr(path, "user.virtfs.uid", &credp->fc_uid, sizeof(uid_t),
	0);
	if (err) {
	return err;
	}
	}
	if (credp->fc_gid != -1) {
	err = setxattr(path, "user.virtfs.gid", &credp->fc_gid, sizeof(gid_t),
	0);
	if (err) {
	return err;
	}
	}
	if (credp->fc_mode != -1) {
	err = setxattr(path, "user.virtfs.mode", &credp->fc_mode,
	sizeof(mode_t), 0);
	if (err) {
	return err;
	}
	}
	if (credp->fc_rdev != -1) {
	err = setxattr(path, "user.virtfs.rdev", &credp->fc_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)
	{
	if (chmod(rpath(fs_ctx, path), credp->fc_mode & 07777) < 0) {
	return -1;
	}
	if (lchown(rpath(fs_ctx, path), 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->fs_sm != SM_NONE) {
	return -1;
	}
	}
	return 0;
	}

	static ssize_t local_readlink(FsContext fs_ctx, const char path,
	char *buf, size_t bufsz)
	{
	ssize_t tsize = -1;
	if (fs_ctx->fs_sm == SM_MAPPED) {
	int fd;
	fd = open(rpath(fs_ctx, path), O_RDONLY);
	if (fd == -1) {
	return -1;
	}
	do {
	tsize = read(fd, (void *)buf, bufsz);
	} while (tsize == -1 && errno == EINTR);
	close(fd);
	return tsize;
	} else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) \|\|
	(fs_ctx->fs_sm == SM_NONE)) {
	tsize = readlink(rpath(fs_ctx, path), buf, bufsz);
	}
	return tsize;
	}

	static int local_close(FsContext *ctx, int fd)
	{
	return close(fd);
	}

	static int local_closedir(FsContext ctx, DIR dir)
	{
	return closedir(dir);
	}

	static int local_open(FsContext ctx, const char path, int flags)
	{
	return open(rpath(ctx, path), flags);
	}

	static DIR local_opendir(FsContext ctx, const char *path)
	{
	return opendir(rpath(ctx, path));
	}

	static void local_rewinddir(FsContext ctx, DIR dir)
	{
	return rewinddir(dir);
	}

	static off_t local_telldir(FsContext ctx, DIR dir)
	{
	return telldir(dir);
	}

	static struct dirent local_readdir(FsContext ctx, DIR *dir)
	{
	return readdir(dir);
	}

	static void local_seekdir(FsContext ctx, DIR dir, off_t off)
	{
	return seekdir(dir, off);
	}

	static ssize_t local_preadv(FsContext ctx, int fd, const struct iovec iov,
	int iovcnt, off_t offset)
	{
	#ifdef CONFIG_PREADV
	return preadv(fd, iov, iovcnt, offset);
	#else
	int err = lseek(fd, offset, SEEK_SET);
	if (err == -1) {
	return err;
	} else {
	return readv(fd, iov, iovcnt);
	}
	#endif
	}

	static ssize_t local_pwritev(FsContext ctx, int fd, const struct iovec iov,
	int iovcnt, off_t offset)
	{
	#ifdef CONFIG_PREADV
	return pwritev(fd, iov, iovcnt, offset);
	#else
	int err = lseek(fd, offset, SEEK_SET);
	if (err == -1) {
	return err;
	} else {
	return writev(fd, iov, iovcnt);
	}
	#endif
	}

	static int local_chmod(FsContext fs_ctx, const char path, FsCred *credp)
	{
	if (fs_ctx->fs_sm == SM_MAPPED) {
	return local_set_xattr(rpath(fs_ctx, path), credp);
	} else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) \|\|
	(fs_ctx->fs_sm == SM_NONE)) {
	return chmod(rpath(fs_ctx, path), credp->fc_mode);
	}
	return -1;
	}

	static int local_mknod(FsContext fs_ctx, const char path, FsCred *credp)
	{
	int err = -1;
	int serrno = 0;

	/* Determine the security model */
	if (fs_ctx->fs_sm == SM_MAPPED) {
	err = mknod(rpath(fs_ctx, path), SM_LOCAL_MODE_BITS\|S_IFREG, 0);
	if (err == -1) {
	return err;
	}
	local_set_xattr(rpath(fs_ctx, path), credp);
	if (err == -1) {
	serrno = errno;
	goto err_end;
	}
	} else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) \|\|
	(fs_ctx->fs_sm == SM_NONE)) {
	err = mknod(rpath(fs_ctx, path), credp->fc_mode, credp->fc_rdev);
	if (err == -1) {
	return err;
	}
	err = local_post_create_passthrough(fs_ctx, path, credp);
	if (err == -1) {
	serrno = errno;
	goto err_end;
	}
	}
	return err;

	err_end:
	remove(rpath(fs_ctx, path));
	errno = serrno;
	return err;
	}

	static int local_mkdir(FsContext fs_ctx, const char path, FsCred *credp)
	{
	int err = -1;
	int serrno = 0;

	/* Determine the security model */
	if (fs_ctx->fs_sm == SM_MAPPED) {
	err = mkdir(rpath(fs_ctx, path), SM_LOCAL_DIR_MODE_BITS);
	if (err == -1) {
	return err;
	}
	credp->fc_mode = credp->fc_mode\|S_IFDIR;
	err = local_set_xattr(rpath(fs_ctx, path), credp);
	if (err == -1) {
	serrno = errno;
	goto err_end;
	}
	} else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) \|\|
	(fs_ctx->fs_sm == SM_NONE)) {
	err = mkdir(rpath(fs_ctx, path), credp->fc_mode);
	if (err == -1) {
	return err;
	}
	err = local_post_create_passthrough(fs_ctx, path, credp);
	if (err == -1) {
	serrno = errno;
	goto err_end;
	}
	}
	return err;

	err_end:
	remove(rpath(fs_ctx, path));
	errno = serrno;
	return err;
	}

	static int local_fstat(FsContext fs_ctx, int fd, struct stat stbuf)
	{
	int err;
	err = fstat(fd, stbuf);
	if (err) {
	return err;
	}
	if (fs_ctx->fs_sm == 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 = tmp_uid;
	}
	if (fgetxattr(fd, "user.virtfs.gid", &tmp_gid, sizeof(gid_t)) > 0) {
	stbuf->st_gid = tmp_gid;
	}
	if (fgetxattr(fd, "user.virtfs.mode", &tmp_mode, sizeof(mode_t)) > 0) {
	stbuf->st_mode = tmp_mode;
	}
	if (fgetxattr(fd, "user.virtfs.rdev", &tmp_dev, sizeof(dev_t)) > 0) {
	stbuf->st_rdev = tmp_dev;
	}
	}
	return err;
	}

	static int local_open2(FsContext fs_ctx, const char path, int flags,
	FsCred *credp)
	{
	int fd = -1;
	int err = -1;
	int serrno = 0;

	/* Determine the security model */
	if (fs_ctx->fs_sm == SM_MAPPED) {
	fd = open(rpath(fs_ctx, path), flags, SM_LOCAL_MODE_BITS);
	if (fd == -1) {
	return fd;
	}
	credp->fc_mode = credp->fc_mode\|S_IFREG;
	/* Set cleint credentials in xattr */
	err = local_set_xattr(rpath(fs_ctx, path), credp);
	if (err == -1) {
	serrno = errno;
	goto err_end;
	}
	} else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) \|\|
	(fs_ctx->fs_sm == SM_NONE)) {
	fd = open(rpath(fs_ctx, path), flags, credp->fc_mode);
	if (fd == -1) {
	return fd;
	}
	err = local_post_create_passthrough(fs_ctx, path, credp);
	if (err == -1) {
	serrno = errno;
	goto err_end;
	}
	}
	return fd;

	err_end:
	close(fd);
	remove(rpath(fs_ctx, path));
	errno = serrno;
	return err;
	}


	static int local_symlink(FsContext fs_ctx, const char oldpath,
	const char newpath, FsCred credp)
	{
	int err = -1;
	int serrno = 0;

	/* Determine the security model */
	if (fs_ctx->fs_sm == SM_MAPPED) {
	int fd;
	ssize_t oldpath_size, write_size;
	fd = open(rpath(fs_ctx, newpath), O_CREAT\|O_EXCL\|O_RDWR,
	SM_LOCAL_MODE_BITS);
	if (fd == -1) {
	return fd;
	}
	/* Write the oldpath (target) to the file. */
	oldpath_size = strlen(oldpath) + 1;
	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(rpath(fs_ctx, newpath), credp);
	if (err == -1) {
	serrno = errno;
	goto err_end;
	}
	} else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) \|\|
	(fs_ctx->fs_sm == SM_NONE)) {
	err = symlink(oldpath, rpath(fs_ctx, newpath));
	if (err) {
	return err;
	}
	err = lchown(rpath(fs_ctx, newpath), 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->fs_sm != SM_NONE) {
	serrno = errno;
	goto err_end;
	} else
	err = 0;
	}
	}
	return err;

	err_end:
	remove(rpath(fs_ctx, newpath));
	errno = serrno;
	return err;
	}

	static int local_link(FsContext ctx, const char oldpath, const char *newpath)
	{
	char *tmp = qemu_strdup(rpath(ctx, oldpath));
	int err, serrno = 0;

	if (tmp == NULL) {
	return -ENOMEM;
	}

	err = link(tmp, rpath(ctx, newpath));
	if (err == -1) {
	serrno = errno;
	}

	qemu_free(tmp);

	if (err == -1) {
	errno = serrno;
	}

	return err;
	}

	static int local_truncate(FsContext ctx, const char path, off_t size)
	{
	return truncate(rpath(ctx, path), size);
	}

	static int local_rename(FsContext ctx, const char oldpath,
	const char *newpath)
	{
	char *tmp;
	int err;

	tmp = qemu_strdup(rpath(ctx, oldpath));

	err = rename(tmp, rpath(ctx, newpath));
	if (err == -1) {
	int serrno = errno;
	qemu_free(tmp);
	errno = serrno;
	} else {
	qemu_free(tmp);
	}

	return err;

	}

	static int local_chown(FsContext fs_ctx, const char path, FsCred *credp)
	{
	if ((credp->fc_uid == -1 && credp->fc_gid == -1) \|\|
	(fs_ctx->fs_sm == SM_PASSTHROUGH)) {
	return lchown(rpath(fs_ctx, path), credp->fc_uid, credp->fc_gid);
	} else if (fs_ctx->fs_sm == SM_MAPPED) {
	return local_set_xattr(rpath(fs_ctx, path), credp);
	} else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) \|\|
	(fs_ctx->fs_sm == SM_NONE)) {
	return lchown(rpath(fs_ctx, path), credp->fc_uid, credp->fc_gid);
	}
	return -1;
	}

	static int local_utimensat(FsContext s, const char path,
	const struct timespec *buf)
	{
	return qemu_utimensat(AT_FDCWD, rpath(s, path), buf, AT_SYMLINK_NOFOLLOW);
	}

	static int local_remove(FsContext ctx, const char path)
	{
	return remove(rpath(ctx, path));
	}

	static int local_fsync(FsContext *ctx, int fd, int datasync)
	{
	if (datasync) {
	return qemu_fdatasync(fd);
	} else {
	return fsync(fd);
	}
	}

	static int local_statfs(FsContext s, const char path, struct statfs *stbuf)
	{
	return statfs(rpath(s, path), stbuf);
	}

	static ssize_t local_lgetxattr(FsContext ctx, const char path,
	const char name, void value, size_t size)
	{
	return v9fs_get_xattr(ctx, path, name, value, size);
	}

	static ssize_t local_llistxattr(FsContext ctx, const char path,
	void *value, size_t size)
	{
	return v9fs_list_xattr(ctx, path, value, size);
	}

	static int local_lsetxattr(FsContext ctx, const char path, const char *name,
	void *value, size_t size, int flags)
	{
	return v9fs_set_xattr(ctx, path, name, value, size, flags);
	}

	static int local_lremovexattr(FsContext *ctx,
	const char path, const char name)
	{
	return v9fs_remove_xattr(ctx, path, name);
	}


	FileOperations local_ops = {
	.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,
	};