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