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/*
* 9p utilities (FreeBSD Implementation)
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
/*
* Not so fast! You might want to read the 9p developer docs first:
* https://wiki.qemu.org/Documentation/9p
*/
#include "qemu/osdep.h"
#include "qemu/xattr.h"
#include "9p-util.h"
static int mangle_xattr_name(const char **namep)
{
const char *name = *namep;
/*
* ZFS forbids attributes in starting with "user." or "system.".
*/
if (strncmp(name, "system.", 7) == 0) {
*namep = name + 7;
return EXTATTR_NAMESPACE_SYSTEM;
}
if (strncmp(name, "user.", 5) == 0) {
*namep = name + 5;
}
return EXTATTR_NAMESPACE_USER;
}
ssize_t fgetxattr(int fd, const char *name, void *value, size_t size)
{
int namespace;
namespace = mangle_xattr_name(&name);
return extattr_get_fd(fd, namespace, name, value, size);
}
ssize_t fgetxattrat_nofollow(int dirfd, const char *filename, const char *name,
void *value, size_t size)
{
ssize_t ret;
int fd, namespace;
fd = openat_file(dirfd, filename,
O_RDONLY | O_PATH_9P_UTIL | O_NOFOLLOW, 0);
if (fd == -1) {
return -1;
}
namespace = mangle_xattr_name(&name);
ret = extattr_get_fd(fd, namespace, name, value, size);
close_preserve_errno(fd);
return ret;
}
ssize_t flistxattrat_nofollow(int dirfd, const char *filename,
char *list, size_t size)
{
ssize_t ret;
int fd;
fd = openat_file(dirfd, filename,
O_RDONLY | O_PATH_9P_UTIL | O_NOFOLLOW, 0);
if (fd == -1) {
return -1;
}
ret = extattr_list_fd(fd, EXTATTR_NAMESPACE_USER, list, size);
close_preserve_errno(fd);
return ret;
}
ssize_t fremovexattrat_nofollow(int dirfd, const char *filename,
const char *name)
{
int fd, namespace, ret;
fd = openat_file(dirfd, filename,
O_RDONLY | O_PATH_9P_UTIL | O_NOFOLLOW, 0);
if (fd == -1) {
return -1;
}
namespace = mangle_xattr_name(&name);
ret = extattr_delete_fd(fd, namespace, name);
close_preserve_errno(fd);
return ret;
}
int fsetxattrat_nofollow(int dirfd, const char *filename, const char *name,
void *value, size_t size, int flags)
{
ssize_t ret;
int fd, namespace;
namespace = mangle_xattr_name(&name);
if (flags == (XATTR_CREATE | XATTR_REPLACE)) {
errno = EINVAL;
return -1;
}
fd = openat_file(dirfd, filename,
O_RDONLY | O_PATH_9P_UTIL | O_NOFOLLOW, 0);
if (fd == -1) {
return -1;
}
if (flags & (XATTR_CREATE | XATTR_REPLACE)) {
ret = extattr_get_fd(fd, namespace, name, NULL, 0);
if (ret == -1 && errno != ENOATTR) {
close_preserve_errno(fd);
return -1;
}
if (ret >= 0 && (flags & XATTR_CREATE)) {
errno = EEXIST;
close_preserve_errno(fd);
return -1;
}
if (ret == -1 && (flags & XATTR_REPLACE)) {
errno = ENOATTR;
close_preserve_errno(fd);
return -1;
}
}
ret = extattr_set_fd(fd, namespace, name, value, size);
close_preserve_errno(fd);
return ret;
}
int qemu_mknodat(int dirfd, const char *filename, mode_t mode, dev_t dev)
{
return mknodat(dirfd, filename, mode, dev);
}
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