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)
32 buffer = rpath(ctx, path);
34 ret = lgetxattr(buffer, MAP_ACL_ACCESS, value, size);
36 ret = getxattr(buffer, MAP_ACL_ACCESS, value, size, 0, XATTR_NOFOLLOW);
42 static ssize_t mp_pacl_listxattr(FsContext *ctx, const char *path,
43 char *name, void *value, size_t osize)
45 ssize_t len = sizeof(ACL_ACCESS);
56 /* len includes the trailing NUL */
57 memcpy(value, ACL_ACCESS, len);
61 static int mp_pacl_setxattr(FsContext *ctx, const char *path, const char *name,
62 void *value, size_t size, int flags)
67 buffer = rpath(ctx, path);
68 ret = lsetxattr(buffer, MAP_ACL_ACCESS, value, size, flags);
71 ret = lsetxattr(buffer, MAP_ACL_ACCESS, value, size, flags);
73 ret = setxattr(buffer, MAP_ACL_ACCESS, value, size, 0, flags | XATTR_NOFOLLOW);
80 static int mp_pacl_removexattr(FsContext *ctx,
81 const char *path, const char *name)
86 buffer = rpath(ctx, path);
89 ret = lremovexattr(buffer, MAP_ACL_ACCESS);
91 ret = removexattr(buffer, MAP_ACL_ACCESS, XATTR_NOFOLLOW);
93 if (ret == -1 && errno == ENODATA) {
95 * We don't get ENODATA error when trying to remove a
96 * posix acl that is not present. So don't throw the error
97 * even in case of mapped security model
106 static ssize_t mp_dacl_getxattr(FsContext *ctx, const char *path,
107 const char *name, void *value, size_t size)
112 buffer = rpath(ctx, path);
114 ret = lgetxattr(buffer, MAP_ACL_DEFAULT, value, size);
116 ret = getxattr(buffer, MAP_ACL_DEFAULT, value, size, 0, XATTR_NOFOLLOW);
122 static ssize_t mp_dacl_listxattr(FsContext *ctx, const char *path,
123 char *name, void *value, size_t osize)
125 ssize_t len = sizeof(ACL_DEFAULT);
136 /* len includes the trailing NUL */
137 memcpy(value, ACL_ACCESS, len);
141 static int mp_dacl_setxattr(FsContext *ctx, const char *path, const char *name,
142 void *value, size_t size, int flags)
147 buffer = rpath(ctx, path);
149 return lsetxattr(buffer, MAP_ACL_DEFAULT, value,
152 return setxattr(buffer, MAP_ACL_DEFAULT, value,
153 size, 0, flags | XATTR_NOFOLLOW);
159 static int mp_dacl_removexattr(FsContext *ctx,
160 const char *path, const char *name)
165 buffer = rpath(ctx, path);
167 ret = lremovexattr(buffer, MAP_ACL_DEFAULT);
169 ret = removexattr(buffer, MAP_ACL_DEFAULT, XATTR_NOFOLLOW);
171 if (ret == -1 && errno == ENODATA) {
173 * We don't get ENODATA error when trying to remove a
174 * posix acl that is not present. So don't throw the error
175 * even in case of mapped security model
185 XattrOperations mapped_pacl_xattr = {
186 .name = "system.posix_acl_access",
187 .getxattr = mp_pacl_getxattr,
188 .setxattr = mp_pacl_setxattr,
189 .listxattr = mp_pacl_listxattr,
190 .removexattr = mp_pacl_removexattr,
193 XattrOperations mapped_dacl_xattr = {
194 .name = "system.posix_acl_default",
195 .getxattr = mp_dacl_getxattr,
196 .setxattr = mp_dacl_setxattr,
197 .listxattr = mp_dacl_listxattr,
198 .removexattr = mp_dacl_removexattr,
201 XattrOperations passthrough_acl_xattr = {
202 .name = "system.posix_acl_",
203 .getxattr = pt_getxattr,
204 .setxattr = pt_setxattr,
205 .listxattr = pt_listxattr,
206 .removexattr = pt_removexattr,
209 XattrOperations none_acl_xattr = {
210 .name = "system.posix_acl_",
211 .getxattr = notsup_getxattr,
212 .setxattr = notsup_setxattr,
213 .listxattr = notsup_listxattr,
214 .removexattr = notsup_removexattr,