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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
b7fa0554 | 2 | #include <linux/fs.h> |
5a0e3ad6 | 3 | #include <linux/gfp.h> |
b7fa0554 AG |
4 | #include <linux/nfs.h> |
5 | #include <linux/nfs3.h> | |
6 | #include <linux/nfs_fs.h> | |
334a13ec | 7 | #include <linux/posix_acl_xattr.h> |
b7fa0554 AG |
8 | #include <linux/nfsacl.h> |
9 | ||
f41f7418 | 10 | #include "internal.h" |
3fc3edf1 | 11 | #include "nfs3_fs.h" |
f41f7418 | 12 | |
b7fa0554 AG |
13 | #define NFSDBG_FACILITY NFSDBG_PROC |
14 | ||
b8a7a3a6 AG |
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 | */ | |
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 | ||
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 | ||
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 | ||
013cdf10 | 47 | struct posix_acl *nfs3_get_acl(struct inode *inode, int type) |
b7fa0554 AG |
48 | { |
49 | struct nfs_server *server = NFS_SERVER(inode); | |
b7fa0554 AG |
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 = { | |
17280175 | 57 | NULL, |
b7fa0554 | 58 | }; |
dead28da CL |
59 | struct rpc_message msg = { |
60 | .rpc_argp = &args, | |
61 | .rpc_resp = &res, | |
62 | }; | |
b7fa0554 AG |
63 | int status, count; |
64 | ||
65 | if (!nfs_server_capable(inode, NFS_CAP_ACLS)) | |
66 | return ERR_PTR(-EOPNOTSUPP); | |
67 | ||
5c6a9f7d AG |
68 | status = nfs_revalidate_inode(server, inode); |
69 | if (status < 0) | |
70 | return ERR_PTR(status); | |
b7fa0554 | 71 | |
5c6a9f7d AG |
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; | |
b7fa0554 AG |
84 | |
85 | dprintk("NFS call getacl\n"); | |
dead28da | 86 | msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_GETACL]; |
6e94d629 TM |
87 | res.fattr = nfs_alloc_fattr(); |
88 | if (res.fattr == NULL) | |
89 | return ERR_PTR(-ENOMEM); | |
90 | ||
b8a7a3a6 AG |
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 | ||
dead28da | 96 | status = rpc_call_sync(server->client_acl, &msg, 0); |
b7fa0554 AG |
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: | |
6e94d629 | 105 | status = nfs_refresh_inode(inode, res.fattr); |
b7fa0554 AG |
106 | break; |
107 | case -EPFNOSUPPORT: | |
108 | case -EPROTONOSUPPORT: | |
109 | dprintk("NFS_V3_ACL extension not supported; disabling\n"); | |
110 | server->caps &= ~NFS_CAP_ACLS; | |
01e03bdc | 111 | /* fall through */ |
b7fa0554 AG |
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) { | |
718360c5 | 123 | if ((posix_acl_equiv_mode(res.acl_access, NULL) == 0) || |
013cdf10 | 124 | res.acl_access->a_count == 0) { |
b7fa0554 AG |
125 | posix_acl_release(res.acl_access); |
126 | res.acl_access = NULL; | |
127 | } | |
128 | } | |
129 | ||
013cdf10 | 130 | if (res.mask & NFS_ACL) |
b8a7a3a6 | 131 | nfs3_complete_get_acl(&inode->i_acl, res.acl_access); |
013cdf10 CH |
132 | else |
133 | forget_cached_acl(inode, ACL_TYPE_ACCESS); | |
b7fa0554 | 134 | |
013cdf10 | 135 | if (res.mask & NFS_DFACL) |
b8a7a3a6 | 136 | nfs3_complete_get_acl(&inode->i_default_acl, res.acl_default); |
013cdf10 CH |
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; | |
b7fa0554 AG |
147 | } |
148 | ||
149 | getout: | |
b8a7a3a6 AG |
150 | nfs3_abort_get_acl(&inode->i_acl); |
151 | nfs3_abort_get_acl(&inode->i_default_acl); | |
b7fa0554 AG |
152 | posix_acl_release(res.acl_access); |
153 | posix_acl_release(res.acl_default); | |
6e94d629 | 154 | nfs_free_fattr(res.fattr); |
013cdf10 | 155 | return ERR_PTR(status); |
b7fa0554 AG |
156 | } |
157 | ||
8f493b9c | 158 | static int __nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl, |
013cdf10 | 159 | struct posix_acl *dfacl) |
b7fa0554 AG |
160 | { |
161 | struct nfs_server *server = NFS_SERVER(inode); | |
6e94d629 | 162 | struct nfs_fattr *fattr; |
ae46141f | 163 | struct page *pages[NFSACL_MAXPAGES]; |
b7fa0554 AG |
164 | struct nfs3_setaclargs args = { |
165 | .inode = inode, | |
166 | .mask = NFS_ACL, | |
167 | .acl_access = acl, | |
168 | .pages = pages, | |
169 | }; | |
dead28da CL |
170 | struct rpc_message msg = { |
171 | .rpc_argp = &args, | |
172 | .rpc_resp = &fattr, | |
173 | }; | |
f87d928f TM |
174 | int status = 0; |
175 | ||
176 | if (acl == NULL && (!S_ISDIR(inode->i_mode) || dfacl == NULL)) | |
177 | goto out; | |
b7fa0554 AG |
178 | |
179 | status = -EOPNOTSUPP; | |
180 | if (!nfs_server_capable(inode, NFS_CAP_ACLS)) | |
181 | goto out; | |
182 | ||
f61f6da0 CL |
183 | /* We are doing this here because XDR marshalling does not |
184 | * return any results, it BUGs. */ | |
b7fa0554 AG |
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; | |
ae46141f TM |
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); | |
b7fa0554 AG |
207 | } |
208 | ||
209 | dprintk("NFS call setacl\n"); | |
6e94d629 TM |
210 | status = -ENOMEM; |
211 | fattr = nfs_alloc_fattr(); | |
212 | if (fattr == NULL) | |
213 | goto out_freepages; | |
214 | ||
dead28da | 215 | msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_SETACL]; |
6e94d629 | 216 | msg.rpc_resp = fattr; |
dead28da | 217 | status = rpc_call_sync(server->client_acl, &msg, 0); |
f41f7418 TM |
218 | nfs_access_zap_cache(inode); |
219 | nfs_zap_acl_cache(inode); | |
b7fa0554 AG |
220 | dprintk("NFS reply setacl: %d\n", status); |
221 | ||
b7fa0554 AG |
222 | switch (status) { |
223 | case 0: | |
6e94d629 | 224 | status = nfs_refresh_inode(inode, fattr); |
013cdf10 CH |
225 | set_cached_acl(inode, ACL_TYPE_ACCESS, acl); |
226 | set_cached_acl(inode, ACL_TYPE_DEFAULT, dfacl); | |
b7fa0554 AG |
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; | |
01e03bdc | 233 | /* fall through */ |
b7fa0554 AG |
234 | case -ENOTSUPP: |
235 | status = -EOPNOTSUPP; | |
236 | } | |
6e94d629 | 237 | nfs_free_fattr(fattr); |
ae46141f TM |
238 | out_freepages: |
239 | while (args.npages != 0) { | |
240 | args.npages--; | |
241 | __free_page(args.pages[args.npages]); | |
242 | } | |
b7fa0554 AG |
243 | out: |
244 | return status; | |
245 | } | |
246 | ||
8f493b9c TM |
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 | ||
013cdf10 | 256 | int nfs3_set_acl(struct inode *inode, struct posix_acl *acl, int type) |
b7fa0554 AG |
257 | { |
258 | struct posix_acl *alloc = NULL, *dfacl = NULL; | |
259 | int status; | |
260 | ||
261 | if (S_ISDIR(inode->i_mode)) { | |
262 | switch(type) { | |
013cdf10 CH |
263 | case ACL_TYPE_ACCESS: |
264 | alloc = dfacl = get_acl(inode, ACL_TYPE_DEFAULT); | |
265 | if (IS_ERR(alloc)) | |
266 | goto fail; | |
267 | break; | |
268 | ||
269 | case ACL_TYPE_DEFAULT: | |
270 | dfacl = acl; | |
271 | alloc = acl = get_acl(inode, ACL_TYPE_ACCESS); | |
272 | if (IS_ERR(alloc)) | |
273 | goto fail; | |
274 | break; | |
b7fa0554 | 275 | } |
013cdf10 | 276 | } |
b7fa0554 AG |
277 | |
278 | if (acl == NULL) { | |
279 | alloc = acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); | |
280 | if (IS_ERR(alloc)) | |
281 | goto fail; | |
282 | } | |
8f493b9c | 283 | status = __nfs3_proc_setacls(inode, acl, dfacl); |
b7fa0554 AG |
284 | posix_acl_release(alloc); |
285 | return status; | |
286 | ||
287 | fail: | |
288 | return PTR_ERR(alloc); | |
289 | } | |
055ffbea | 290 | |
013cdf10 CH |
291 | const struct xattr_handler *nfs3_xattr_handlers[] = { |
292 | &posix_acl_access_xattr_handler, | |
293 | &posix_acl_default_xattr_handler, | |
294 | NULL, | |
295 | }; | |
74adf83f CH |
296 | |
297 | static int | |
298 | nfs3_list_one_acl(struct inode *inode, int type, const char *name, void *data, | |
299 | size_t size, ssize_t *result) | |
300 | { | |
301 | struct posix_acl *acl; | |
302 | char *p = data + *result; | |
303 | ||
304 | acl = get_acl(inode, type); | |
7a9e75a1 | 305 | if (IS_ERR_OR_NULL(acl)) |
74adf83f CH |
306 | return 0; |
307 | ||
308 | posix_acl_release(acl); | |
309 | ||
310 | *result += strlen(name); | |
311 | *result += 1; | |
312 | if (!size) | |
313 | return 0; | |
314 | if (*result > size) | |
315 | return -ERANGE; | |
316 | ||
317 | strcpy(p, name); | |
318 | return 0; | |
319 | } | |
320 | ||
321 | ssize_t | |
322 | nfs3_listxattr(struct dentry *dentry, char *data, size_t size) | |
323 | { | |
2b0143b5 | 324 | struct inode *inode = d_inode(dentry); |
74adf83f CH |
325 | ssize_t result = 0; |
326 | int error; | |
327 | ||
328 | error = nfs3_list_one_acl(inode, ACL_TYPE_ACCESS, | |
97d79299 | 329 | XATTR_NAME_POSIX_ACL_ACCESS, data, size, &result); |
74adf83f CH |
330 | if (error) |
331 | return error; | |
332 | ||
333 | error = nfs3_list_one_acl(inode, ACL_TYPE_DEFAULT, | |
97d79299 | 334 | XATTR_NAME_POSIX_ACL_DEFAULT, data, size, &result); |
74adf83f CH |
335 | if (error) |
336 | return error; | |
337 | return result; | |
338 | } |