1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/fs.h>
3 #include <linux/gfp.h>
4 #include <linux/nfs.h>
5 #include <linux/nfs3.h>
6 #include <linux/nfs_fs.h>
7 #include <linux/posix_acl_xattr.h>
8 #include <linux/nfsacl.h>
9
10 #include "internal.h"
11 #include "nfs3_fs.h"
12
13 #define NFSDBG_FACILITY NFSDBG_PROC
14
15 /*
16 * nfs3_prepare_get_acl, nfs3_complete_get_acl, nfs3_abort_get_acl: Helpers for
17 * caching get_acl results in a race-free way. See fs/posix_acl.c:get_acl()
18 * for explanations.
19 */
nfs3_prepare_get_acl(struct posix_acl ** p)20 static void nfs3_prepare_get_acl(struct posix_acl **p)
21 {
22 struct posix_acl *sentinel = uncached_acl_sentinel(current);
23
24 if (cmpxchg(p, ACL_NOT_CACHED, sentinel) != ACL_NOT_CACHED) {
25 /* Not the first reader or sentinel already in place. */
26 }
27 }
28
nfs3_complete_get_acl(struct posix_acl ** p,struct posix_acl * acl)29 static void nfs3_complete_get_acl(struct posix_acl **p, struct posix_acl *acl)
30 {
31 struct posix_acl *sentinel = uncached_acl_sentinel(current);
32
33 /* Only cache the ACL if our sentinel is still in place. */
34 posix_acl_dup(acl);
35 if (cmpxchg(p, sentinel, acl) != sentinel)
36 posix_acl_release(acl);
37 }
38
nfs3_abort_get_acl(struct posix_acl ** p)39 static void nfs3_abort_get_acl(struct posix_acl **p)
40 {
41 struct posix_acl *sentinel = uncached_acl_sentinel(current);
42
43 /* Remove our sentinel upon failure. */
44 cmpxchg(p, sentinel, ACL_NOT_CACHED);
45 }
46
nfs3_get_acl(struct inode * inode,int type)47 struct posix_acl *nfs3_get_acl(struct inode *inode, int type)
48 {
49 struct nfs_server *server = NFS_SERVER(inode);
50 struct page *pages[NFSACL_MAXPAGES] = { };
51 struct nfs3_getaclargs args = {
52 .fh = NFS_FH(inode),
53 /* The xdr layer may allocate pages here. */
54 .pages = pages,
55 };
56 struct nfs3_getaclres res = {
57 NULL,
58 };
59 struct rpc_message msg = {
60 .rpc_argp = &args,
61 .rpc_resp = &res,
62 };
63 int status, count;
64
65 if (!nfs_server_capable(inode, NFS_CAP_ACLS))
66 return ERR_PTR(-EOPNOTSUPP);
67
68 status = nfs_revalidate_inode(server, inode);
69 if (status < 0)
70 return ERR_PTR(status);
71
72 /*
73 * Only get the access acl when explicitly requested: We don't
74 * need it for access decisions, and only some applications use
75 * it. Applications which request the access acl first are not
76 * penalized from this optimization.
77 */
78 if (type == ACL_TYPE_ACCESS)
79 args.mask |= NFS_ACLCNT|NFS_ACL;
80 if (S_ISDIR(inode->i_mode))
81 args.mask |= NFS_DFACLCNT|NFS_DFACL;
82 if (args.mask == 0)
83 return NULL;
84
85 dprintk("NFS call getacl\n");
86 msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_GETACL];
87 res.fattr = nfs_alloc_fattr();
88 if (res.fattr == NULL)
89 return ERR_PTR(-ENOMEM);
90
91 if (args.mask & NFS_ACL)
92 nfs3_prepare_get_acl(&inode->i_acl);
93 if (args.mask & NFS_DFACL)
94 nfs3_prepare_get_acl(&inode->i_default_acl);
95
96 status = rpc_call_sync(server->client_acl, &msg, 0);
97 dprintk("NFS reply getacl: %d\n", status);
98
99 /* pages may have been allocated at the xdr layer. */
100 for (count = 0; count < NFSACL_MAXPAGES && args.pages[count]; count++)
101 __free_page(args.pages[count]);
102
103 switch (status) {
104 case 0:
105 status = nfs_refresh_inode(inode, res.fattr);
106 break;
107 case -EPFNOSUPPORT:
108 case -EPROTONOSUPPORT:
109 dprintk("NFS_V3_ACL extension not supported; disabling\n");
110 server->caps &= ~NFS_CAP_ACLS;
111 /* fall through */
112 case -ENOTSUPP:
113 status = -EOPNOTSUPP;
114 default:
115 goto getout;
116 }
117 if ((args.mask & res.mask) != args.mask) {
118 status = -EIO;
119 goto getout;
120 }
121
122 if (res.acl_access != NULL) {
123 if ((posix_acl_equiv_mode(res.acl_access, NULL) == 0) ||
124 res.acl_access->a_count == 0) {
125 posix_acl_release(res.acl_access);
126 res.acl_access = NULL;
127 }
128 }
129
130 if (res.mask & NFS_ACL)
131 nfs3_complete_get_acl(&inode->i_acl, res.acl_access);
132 else
133 forget_cached_acl(inode, ACL_TYPE_ACCESS);
134
135 if (res.mask & NFS_DFACL)
136 nfs3_complete_get_acl(&inode->i_default_acl, res.acl_default);
137 else
138 forget_cached_acl(inode, ACL_TYPE_DEFAULT);
139
140 nfs_free_fattr(res.fattr);
141 if (type == ACL_TYPE_ACCESS) {
142 posix_acl_release(res.acl_default);
143 return res.acl_access;
144 } else {
145 posix_acl_release(res.acl_access);
146 return res.acl_default;
147 }
148
149 getout:
150 nfs3_abort_get_acl(&inode->i_acl);
151 nfs3_abort_get_acl(&inode->i_default_acl);
152 posix_acl_release(res.acl_access);
153 posix_acl_release(res.acl_default);
154 nfs_free_fattr(res.fattr);
155 return ERR_PTR(status);
156 }
157
__nfs3_proc_setacls(struct inode * inode,struct posix_acl * acl,struct posix_acl * dfacl)158 static int __nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
159 struct posix_acl *dfacl)
160 {
161 struct nfs_server *server = NFS_SERVER(inode);
162 struct nfs_fattr *fattr;
163 struct page *pages[NFSACL_MAXPAGES];
164 struct nfs3_setaclargs args = {
165 .inode = inode,
166 .mask = NFS_ACL,
167 .acl_access = acl,
168 .pages = pages,
169 };
170 struct rpc_message msg = {
171 .rpc_argp = &args,
172 .rpc_resp = &fattr,
173 };
174 int status = 0;
175
176 if (acl == NULL && (!S_ISDIR(inode->i_mode) || dfacl == NULL))
177 goto out;
178
179 status = -EOPNOTSUPP;
180 if (!nfs_server_capable(inode, NFS_CAP_ACLS))
181 goto out;
182
183 /* We are doing this here because XDR marshalling does not
184 * return any results, it BUGs. */
185 status = -ENOSPC;
186 if (acl != NULL && acl->a_count > NFS_ACL_MAX_ENTRIES)
187 goto out;
188 if (dfacl != NULL && dfacl->a_count > NFS_ACL_MAX_ENTRIES)
189 goto out;
190 if (S_ISDIR(inode->i_mode)) {
191 args.mask |= NFS_DFACL;
192 args.acl_default = dfacl;
193 args.len = nfsacl_size(acl, dfacl);
194 } else
195 args.len = nfsacl_size(acl, NULL);
196
197 if (args.len > NFS_ACL_INLINE_BUFSIZE) {
198 unsigned int npages = 1 + ((args.len - 1) >> PAGE_SHIFT);
199
200 status = -ENOMEM;
201 do {
202 args.pages[args.npages] = alloc_page(GFP_KERNEL);
203 if (args.pages[args.npages] == NULL)
204 goto out_freepages;
205 args.npages++;
206 } while (args.npages < npages);
207 }
208
209 dprintk("NFS call setacl\n");
210 status = -ENOMEM;
211 fattr = nfs_alloc_fattr();
212 if (fattr == NULL)
213 goto out_freepages;
214
215 msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_SETACL];
216 msg.rpc_resp = fattr;
217 status = rpc_call_sync(server->client_acl, &msg, 0);
218 nfs_access_zap_cache(inode);
219 nfs_zap_acl_cache(inode);
220 dprintk("NFS reply setacl: %d\n", status);
221
222 switch (status) {
223 case 0:
224 status = nfs_refresh_inode(inode, fattr);
225 set_cached_acl(inode, ACL_TYPE_ACCESS, acl);
226 set_cached_acl(inode, ACL_TYPE_DEFAULT, dfacl);
227 break;
228 case -EPFNOSUPPORT:
229 case -EPROTONOSUPPORT:
230 dprintk("NFS_V3_ACL SETACL RPC not supported"
231 "(will not retry)\n");
232 server->caps &= ~NFS_CAP_ACLS;
233 /* fall through */
234 case -ENOTSUPP:
235 status = -EOPNOTSUPP;
236 }
237 nfs_free_fattr(fattr);
238 out_freepages:
239 while (args.npages != 0) {
240 args.npages--;
241 __free_page(args.pages[args.npages]);
242 }
243 out:
244 return status;
245 }
246
nfs3_proc_setacls(struct inode * inode,struct posix_acl * acl,struct posix_acl * dfacl)247 int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
248 struct posix_acl *dfacl)
249 {
250 int ret;
251 ret = __nfs3_proc_setacls(inode, acl, dfacl);
252 return (ret == -EOPNOTSUPP) ? 0 : ret;
253
254 }
255
nfs3_set_acl(struct inode * inode,struct posix_acl * acl,int type)256 int nfs3_set_acl(struct inode *inode, struct posix_acl *acl, int type)
257 {
258 struct posix_acl *orig = acl, *dfacl = NULL, *alloc;
259 int status;
260
261 if (S_ISDIR(inode->i_mode)) {
262 switch(type) {
263 case ACL_TYPE_ACCESS:
264 alloc = get_acl(inode, ACL_TYPE_DEFAULT);
265 if (IS_ERR(alloc))
266 goto fail;
267 dfacl = alloc;
268 break;
269
270 case ACL_TYPE_DEFAULT:
271 alloc = get_acl(inode, ACL_TYPE_ACCESS);
272 if (IS_ERR(alloc))
273 goto fail;
274 dfacl = acl;
275 acl = alloc;
276 break;
277 }
278 }
279
280 if (acl == NULL) {
281 alloc = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
282 if (IS_ERR(alloc))
283 goto fail;
284 acl = alloc;
285 }
286 status = __nfs3_proc_setacls(inode, acl, dfacl);
287 out:
288 if (acl != orig)
289 posix_acl_release(acl);
290 if (dfacl != orig)
291 posix_acl_release(dfacl);
292 return status;
293
294 fail:
295 status = PTR_ERR(alloc);
296 goto out;
297 }
298
299 const struct xattr_handler *nfs3_xattr_handlers[] = {
300 &posix_acl_access_xattr_handler,
301 &posix_acl_default_xattr_handler,
302 NULL,
303 };
304
305 static int
nfs3_list_one_acl(struct inode * inode,int type,const char * name,void * data,size_t size,ssize_t * result)306 nfs3_list_one_acl(struct inode *inode, int type, const char *name, void *data,
307 size_t size, ssize_t *result)
308 {
309 struct posix_acl *acl;
310 char *p = data + *result;
311
312 acl = get_acl(inode, type);
313 if (IS_ERR_OR_NULL(acl))
314 return 0;
315
316 posix_acl_release(acl);
317
318 *result += strlen(name);
319 *result += 1;
320 if (!size)
321 return 0;
322 if (*result > size)
323 return -ERANGE;
324
325 strcpy(p, name);
326 return 0;
327 }
328
329 ssize_t
nfs3_listxattr(struct dentry * dentry,char * data,size_t size)330 nfs3_listxattr(struct dentry *dentry, char *data, size_t size)
331 {
332 struct inode *inode = d_inode(dentry);
333 ssize_t result = 0;
334 int error;
335
336 error = nfs3_list_one_acl(inode, ACL_TYPE_ACCESS,
337 XATTR_NAME_POSIX_ACL_ACCESS, data, size, &result);
338 if (error)
339 return error;
340
341 error = nfs3_list_one_acl(inode, ACL_TYPE_DEFAULT,
342 XATTR_NAME_POSIX_ACL_DEFAULT, data, size, &result);
343 if (error)
344 return error;
345 return result;
346 }
347