2 * Virtio 9p system.posix* xattr callback
4 * Copyright IBM, Corp. 2010
7 * Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
14 #include <sys/types.h>
15 #include "qemu/xattr.h"
16 #include "hw/virtio/virtio.h"
17 #include "virtio-9p.h"
18 #include "fsdev/file-op-9p.h"
19 #include "virtio-9p-xattr.h"
21 #define MAP_ACL_ACCESS "user.virtfs.system.posix_acl_access"
22 #define MAP_ACL_DEFAULT "user.virtfs.system.posix_acl_default"
23 #define ACL_ACCESS "system.posix_acl_access"
24 #define ACL_DEFAULT "system.posix_acl_default"
26 static ssize_t mp_pacl_getxattr(FsContext *ctx, const char *path,
27 const char *name, void *value, size_t size)
29 char buffer[PATH_MAX];
31 return lgetxattr(rpath(ctx, path, buffer), MAP_ACL_ACCESS, value, size);
33 return getxattr(rpath(ctx, path, buffer), MAP_ACL_ACCESS, value, size, 0, XATTR_NOFOLLOW);
37 static ssize_t mp_pacl_listxattr(FsContext *ctx, const char *path,
38 char *name, void *value, size_t osize)
40 ssize_t len = sizeof(ACL_ACCESS);
51 /* len includes the trailing NUL */
52 memcpy(value, ACL_ACCESS, len);
56 static int mp_pacl_setxattr(FsContext *ctx, const char *path, const char *name,
57 void *value, size_t size, int flags)
59 char buffer[PATH_MAX];
61 return lsetxattr(rpath(ctx, path, buffer), MAP_ACL_ACCESS, value,
64 return setxattr(rpath(ctx, path, buffer), MAP_ACL_ACCESS, value,
65 size, 0, flags | XATTR_NOFOLLOW);
69 static int mp_pacl_removexattr(FsContext *ctx,
70 const char *path, const char *name)
73 char buffer[PATH_MAX];
75 ret = lremovexattr(rpath(ctx, path, buffer), MAP_ACL_ACCESS);
76 if (ret == -1 && errno == ENODATA) {
78 * We don't get ENODATA error when trying to remove a
79 * posix acl that is not present. So don't throw the error
80 * even in case of mapped security model
86 ret = removexattr(rpath(ctx, path, buffer), MAP_ACL_ACCESS, XATTR_NOFOLLOW);
87 if (ret == -1 && errno == ENODATA) {
89 * We don't get ENODATA error when trying to remove a
90 * posix acl that is not present. So don't throw the error
91 * even in case of mapped security model
100 static ssize_t mp_dacl_getxattr(FsContext *ctx, const char *path,
101 const char *name, void *value, size_t size)
103 char buffer[PATH_MAX];
105 return lgetxattr(rpath(ctx, path, buffer), MAP_ACL_DEFAULT, value, size);
107 return getxattr(rpath(ctx, path, buffer), MAP_ACL_DEFAULT, value, size, 0, XATTR_NOFOLLOW);
111 static ssize_t mp_dacl_listxattr(FsContext *ctx, const char *path,
112 char *name, void *value, size_t osize)
114 ssize_t len = sizeof(ACL_DEFAULT);
125 /* len includes the trailing NUL */
126 memcpy(value, ACL_ACCESS, len);
130 static int mp_dacl_setxattr(FsContext *ctx, const char *path, const char *name,
131 void *value, size_t size, int flags)
133 char buffer[PATH_MAX];
135 return lsetxattr(rpath(ctx, path, buffer), MAP_ACL_DEFAULT, value,
138 return setxattr(rpath(ctx, path, buffer), MAP_ACL_DEFAULT, value,
139 size, 0, flags | XATTR_NOFOLLOW);
143 static int mp_dacl_removexattr(FsContext *ctx,
144 const char *path, const char *name)
147 char buffer[PATH_MAX];
149 ret = lremovexattr(rpath(ctx, path, buffer), MAP_ACL_DEFAULT);
150 if (ret == -1 && errno == ENODATA) {
152 * We don't get ENODATA error when trying to remove a
153 * posix acl that is not present. So don't throw the error
154 * even in case of mapped security model
160 ret = removexattr(rpath(ctx, path, buffer), MAP_ACL_DEFAULT, XATTR_NOFOLLOW);
161 if (ret == -1 && errno == ENODATA) {
163 * We don't get ENODATA error when trying to remove a
164 * posix acl that is not present. So don't throw the error
165 * even in case of mapped security model
176 XattrOperations mapped_pacl_xattr = {
177 .name = "system.posix_acl_access",
178 .getxattr = mp_pacl_getxattr,
179 .setxattr = mp_pacl_setxattr,
180 .listxattr = mp_pacl_listxattr,
181 .removexattr = mp_pacl_removexattr,
184 XattrOperations mapped_dacl_xattr = {
185 .name = "system.posix_acl_default",
186 .getxattr = mp_dacl_getxattr,
187 .setxattr = mp_dacl_setxattr,
188 .listxattr = mp_dacl_listxattr,
189 .removexattr = mp_dacl_removexattr,
192 XattrOperations passthrough_acl_xattr = {
193 .name = "system.posix_acl_",
194 .getxattr = pt_getxattr,
195 .setxattr = pt_setxattr,
196 .listxattr = pt_listxattr,
197 .removexattr = pt_removexattr,
200 XattrOperations none_acl_xattr = {
201 .name = "system.posix_acl_",
202 .getxattr = notsup_getxattr,
203 .setxattr = notsup_setxattr,
204 .listxattr = notsup_listxattr,
205 .removexattr = notsup_removexattr,