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1 | #include <linux/fs.h> |
2 | #include <linux/gfp.h> |
3 | #include <linux/nfs.h> |
4 | #include <linux/nfs3.h> |
5 | #include <linux/nfs_fs.h> |
6 | #include <linux/posix_acl_xattr.h> |
7 | #include <linux/nfsacl.h> |
8 | |
9 | #include "internal.h" |
10 | |
11 | #define NFSDBG_FACILITY NFSDBG_PROC |
12 | |
13 | ssize_t nfs3_listxattr(struct dentry *dentry, char *buffer, size_t size) |
14 | { |
15 | struct inode *inode = dentry->d_inode; |
16 | struct posix_acl *acl; |
17 | int pos=0, len=0; |
18 | |
19 | # define output(s) do { \ |
20 | if (pos + sizeof(s) <= size) { \ |
21 | memcpy(buffer + pos, s, sizeof(s)); \ |
22 | pos += sizeof(s); \ |
23 | } \ |
24 | len += sizeof(s); \ |
25 | } while(0) |
26 | |
27 | acl = nfs3_proc_getacl(inode, ACL_TYPE_ACCESS); |
28 | if (IS_ERR(acl)) |
29 | return PTR_ERR(acl); |
30 | if (acl) { |
31 | output("system.posix_acl_access"); |
32 | posix_acl_release(acl); |
33 | } |
34 | |
35 | if (S_ISDIR(inode->i_mode)) { |
36 | acl = nfs3_proc_getacl(inode, ACL_TYPE_DEFAULT); |
37 | if (IS_ERR(acl)) |
38 | return PTR_ERR(acl); |
39 | if (acl) { |
40 | output("system.posix_acl_default"); |
41 | posix_acl_release(acl); |
42 | } |
43 | } |
44 | |
45 | # undef output |
46 | |
47 | if (!buffer || len <= size) |
48 | return len; |
49 | return -ERANGE; |
50 | } |
51 | |
52 | ssize_t nfs3_getxattr(struct dentry *dentry, const char *name, |
53 | void *buffer, size_t size) |
54 | { |
55 | struct inode *inode = dentry->d_inode; |
56 | struct posix_acl *acl; |
57 | int type, error = 0; |
58 | |
59 | if (strcmp(name, POSIX_ACL_XATTR_ACCESS) == 0) |
60 | type = ACL_TYPE_ACCESS; |
61 | else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0) |
62 | type = ACL_TYPE_DEFAULT; |
63 | else |
64 | return -EOPNOTSUPP; |
65 | |
66 | acl = nfs3_proc_getacl(inode, type); |
67 | if (IS_ERR(acl)) |
68 | return PTR_ERR(acl); |
69 | else if (acl) { |
70 | if (type == ACL_TYPE_ACCESS && acl->a_count == 0) |
71 | error = -ENODATA; |
72 | else |
73 | error = posix_acl_to_xattr(acl, buffer, size); |
74 | posix_acl_release(acl); |
75 | } else |
76 | error = -ENODATA; |
77 | |
78 | return error; |
79 | } |
80 | |
81 | int nfs3_setxattr(struct dentry *dentry, const char *name, |
82 | const void *value, size_t size, int flags) |
83 | { |
84 | struct inode *inode = dentry->d_inode; |
85 | struct posix_acl *acl; |
86 | int type, error; |
87 | |
88 | if (strcmp(name, POSIX_ACL_XATTR_ACCESS) == 0) |
89 | type = ACL_TYPE_ACCESS; |
90 | else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0) |
91 | type = ACL_TYPE_DEFAULT; |
92 | else |
93 | return -EOPNOTSUPP; |
94 | |
95 | acl = posix_acl_from_xattr(value, size); |
96 | if (IS_ERR(acl)) |
97 | return PTR_ERR(acl); |
98 | error = nfs3_proc_setacl(inode, type, acl); |
99 | posix_acl_release(acl); |
100 | |
101 | return error; |
102 | } |
103 | |
104 | int nfs3_removexattr(struct dentry *dentry, const char *name) |
105 | { |
106 | struct inode *inode = dentry->d_inode; |
107 | int type; |
108 | |
109 | if (strcmp(name, POSIX_ACL_XATTR_ACCESS) == 0) |
110 | type = ACL_TYPE_ACCESS; |
111 | else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0) |
112 | type = ACL_TYPE_DEFAULT; |
113 | else |
114 | return -EOPNOTSUPP; |
115 | |
116 | return nfs3_proc_setacl(inode, type, NULL); |
117 | } |
118 | |
119 | static void __nfs3_forget_cached_acls(struct nfs_inode *nfsi) |
120 | { |
121 | if (!IS_ERR(nfsi->acl_access)) { |
122 | posix_acl_release(nfsi->acl_access); |
123 | nfsi->acl_access = ERR_PTR(-EAGAIN); |
124 | } |
125 | if (!IS_ERR(nfsi->acl_default)) { |
126 | posix_acl_release(nfsi->acl_default); |
127 | nfsi->acl_default = ERR_PTR(-EAGAIN); |
128 | } |
129 | } |
130 | |
131 | void nfs3_forget_cached_acls(struct inode *inode) |
132 | { |
133 | dprintk("NFS: nfs3_forget_cached_acls(%s/%ld)\n", inode->i_sb->s_id, |
134 | inode->i_ino); |
135 | spin_lock(&inode->i_lock); |
136 | __nfs3_forget_cached_acls(NFS_I(inode)); |
137 | spin_unlock(&inode->i_lock); |
138 | } |
139 | |
140 | static struct posix_acl *nfs3_get_cached_acl(struct inode *inode, int type) |
141 | { |
142 | struct nfs_inode *nfsi = NFS_I(inode); |
143 | struct posix_acl *acl = ERR_PTR(-EINVAL); |
144 | |
145 | spin_lock(&inode->i_lock); |
146 | switch(type) { |
147 | case ACL_TYPE_ACCESS: |
148 | acl = nfsi->acl_access; |
149 | break; |
150 | |
151 | case ACL_TYPE_DEFAULT: |
152 | acl = nfsi->acl_default; |
153 | break; |
154 | |
155 | default: |
156 | goto out; |
157 | } |
158 | if (IS_ERR(acl)) |
159 | acl = ERR_PTR(-EAGAIN); |
160 | else |
161 | acl = posix_acl_dup(acl); |
162 | out: |
163 | spin_unlock(&inode->i_lock); |
164 | dprintk("NFS: nfs3_get_cached_acl(%s/%ld, %d) = %p\n", inode->i_sb->s_id, |
165 | inode->i_ino, type, acl); |
166 | return acl; |
167 | } |
168 | |
169 | static void nfs3_cache_acls(struct inode *inode, struct posix_acl *acl, |
170 | struct posix_acl *dfacl) |
171 | { |
172 | struct nfs_inode *nfsi = NFS_I(inode); |
173 | |
174 | dprintk("nfs3_cache_acls(%s/%ld, %p, %p)\n", inode->i_sb->s_id, |
175 | inode->i_ino, acl, dfacl); |
176 | spin_lock(&inode->i_lock); |
177 | __nfs3_forget_cached_acls(NFS_I(inode)); |
178 | if (!IS_ERR(acl)) |
179 | nfsi->acl_access = posix_acl_dup(acl); |
180 | if (!IS_ERR(dfacl)) |
181 | nfsi->acl_default = posix_acl_dup(dfacl); |
182 | spin_unlock(&inode->i_lock); |
183 | } |
184 | |
185 | struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type) |
186 | { |
187 | struct nfs_server *server = NFS_SERVER(inode); |
188 | struct page *pages[NFSACL_MAXPAGES] = { }; |
189 | struct nfs3_getaclargs args = { |
190 | .fh = NFS_FH(inode), |
191 | /* The xdr layer may allocate pages here. */ |
192 | .pages = pages, |
193 | }; |
194 | struct nfs3_getaclres res = { |
195 | 0 |
196 | }; |
197 | struct rpc_message msg = { |
198 | .rpc_argp = &args, |
199 | .rpc_resp = &res, |
200 | }; |
201 | struct posix_acl *acl; |
202 | int status, count; |
203 | |
204 | if (!nfs_server_capable(inode, NFS_CAP_ACLS)) |
205 | return ERR_PTR(-EOPNOTSUPP); |
206 | |
207 | status = nfs_revalidate_inode(server, inode); |
208 | if (status < 0) |
209 | return ERR_PTR(status); |
210 | acl = nfs3_get_cached_acl(inode, type); |
211 | if (acl != ERR_PTR(-EAGAIN)) |
212 | return acl; |
213 | acl = NULL; |
214 | |
215 | /* |
216 | * Only get the access acl when explicitly requested: We don't |
217 | * need it for access decisions, and only some applications use |
218 | * it. Applications which request the access acl first are not |
219 | * penalized from this optimization. |
220 | */ |
221 | if (type == ACL_TYPE_ACCESS) |
222 | args.mask |= NFS_ACLCNT|NFS_ACL; |
223 | if (S_ISDIR(inode->i_mode)) |
224 | args.mask |= NFS_DFACLCNT|NFS_DFACL; |
225 | if (args.mask == 0) |
226 | return NULL; |
227 | |
228 | dprintk("NFS call getacl\n"); |
229 | msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_GETACL]; |
230 | res.fattr = nfs_alloc_fattr(); |
231 | if (res.fattr == NULL) |
232 | return ERR_PTR(-ENOMEM); |
233 | |
234 | status = rpc_call_sync(server->client_acl, &msg, 0); |
235 | dprintk("NFS reply getacl: %d\n", status); |
236 | |
237 | /* pages may have been allocated at the xdr layer. */ |
238 | for (count = 0; count < NFSACL_MAXPAGES && args.pages[count]; count++) |
239 | __free_page(args.pages[count]); |
240 | |
241 | switch (status) { |
242 | case 0: |
243 | status = nfs_refresh_inode(inode, res.fattr); |
244 | break; |
245 | case -EPFNOSUPPORT: |
246 | case -EPROTONOSUPPORT: |
247 | dprintk("NFS_V3_ACL extension not supported; disabling\n"); |
248 | server->caps &= ~NFS_CAP_ACLS; |
249 | case -ENOTSUPP: |
250 | status = -EOPNOTSUPP; |
251 | default: |
252 | goto getout; |
253 | } |
254 | if ((args.mask & res.mask) != args.mask) { |
255 | status = -EIO; |
256 | goto getout; |
257 | } |
258 | |
259 | if (res.acl_access != NULL) { |
260 | if (posix_acl_equiv_mode(res.acl_access, NULL) == 0) { |
261 | posix_acl_release(res.acl_access); |
262 | res.acl_access = NULL; |
263 | } |
264 | } |
265 | nfs3_cache_acls(inode, |
266 | (res.mask & NFS_ACL) ? res.acl_access : ERR_PTR(-EINVAL), |
267 | (res.mask & NFS_DFACL) ? res.acl_default : ERR_PTR(-EINVAL)); |
268 | |
269 | switch(type) { |
270 | case ACL_TYPE_ACCESS: |
271 | acl = res.acl_access; |
272 | res.acl_access = NULL; |
273 | break; |
274 | |
275 | case ACL_TYPE_DEFAULT: |
276 | acl = res.acl_default; |
277 | res.acl_default = NULL; |
278 | } |
279 | |
280 | getout: |
281 | posix_acl_release(res.acl_access); |
282 | posix_acl_release(res.acl_default); |
283 | nfs_free_fattr(res.fattr); |
284 | |
285 | if (status != 0) { |
286 | posix_acl_release(acl); |
287 | acl = ERR_PTR(status); |
288 | } |
289 | return acl; |
290 | } |
291 | |
292 | static int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl, |
293 | struct posix_acl *dfacl) |
294 | { |
295 | struct nfs_server *server = NFS_SERVER(inode); |
296 | struct nfs_fattr *fattr; |
297 | struct page *pages[NFSACL_MAXPAGES]; |
298 | struct nfs3_setaclargs args = { |
299 | .inode = inode, |
300 | .mask = NFS_ACL, |
301 | .acl_access = acl, |
302 | .pages = pages, |
303 | }; |
304 | struct rpc_message msg = { |
305 | .rpc_argp = &args, |
306 | .rpc_resp = &fattr, |
307 | }; |
308 | int status; |
309 | |
310 | status = -EOPNOTSUPP; |
311 | if (!nfs_server_capable(inode, NFS_CAP_ACLS)) |
312 | goto out; |
313 | |
314 | /* We are doing this here because XDR marshalling does not |
315 | * return any results, it BUGs. */ |
316 | status = -ENOSPC; |
317 | if (acl != NULL && acl->a_count > NFS_ACL_MAX_ENTRIES) |
318 | goto out; |
319 | if (dfacl != NULL && dfacl->a_count > NFS_ACL_MAX_ENTRIES) |
320 | goto out; |
321 | if (S_ISDIR(inode->i_mode)) { |
322 | args.mask |= NFS_DFACL; |
323 | args.acl_default = dfacl; |
324 | args.len = nfsacl_size(acl, dfacl); |
325 | } else |
326 | args.len = nfsacl_size(acl, NULL); |
327 | |
328 | if (args.len > NFS_ACL_INLINE_BUFSIZE) { |
329 | unsigned int npages = 1 + ((args.len - 1) >> PAGE_SHIFT); |
330 | |
331 | status = -ENOMEM; |
332 | do { |
333 | args.pages[args.npages] = alloc_page(GFP_KERNEL); |
334 | if (args.pages[args.npages] == NULL) |
335 | goto out_freepages; |
336 | args.npages++; |
337 | } while (args.npages < npages); |
338 | } |
339 | |
340 | dprintk("NFS call setacl\n"); |
341 | status = -ENOMEM; |
342 | fattr = nfs_alloc_fattr(); |
343 | if (fattr == NULL) |
344 | goto out_freepages; |
345 | |
346 | msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_SETACL]; |
347 | msg.rpc_resp = fattr; |
348 | status = rpc_call_sync(server->client_acl, &msg, 0); |
349 | nfs_access_zap_cache(inode); |
350 | nfs_zap_acl_cache(inode); |
351 | dprintk("NFS reply setacl: %d\n", status); |
352 | |
353 | switch (status) { |
354 | case 0: |
355 | status = nfs_refresh_inode(inode, fattr); |
356 | nfs3_cache_acls(inode, acl, dfacl); |
357 | break; |
358 | case -EPFNOSUPPORT: |
359 | case -EPROTONOSUPPORT: |
360 | dprintk("NFS_V3_ACL SETACL RPC not supported" |
361 | "(will not retry)\n"); |
362 | server->caps &= ~NFS_CAP_ACLS; |
363 | case -ENOTSUPP: |
364 | status = -EOPNOTSUPP; |
365 | } |
366 | nfs_free_fattr(fattr); |
367 | out_freepages: |
368 | while (args.npages != 0) { |
369 | args.npages--; |
370 | __free_page(args.pages[args.npages]); |
371 | } |
372 | out: |
373 | return status; |
374 | } |
375 | |
376 | int nfs3_proc_setacl(struct inode *inode, int type, struct posix_acl *acl) |
377 | { |
378 | struct posix_acl *alloc = NULL, *dfacl = NULL; |
379 | int status; |
380 | |
381 | if (S_ISDIR(inode->i_mode)) { |
382 | switch(type) { |
383 | case ACL_TYPE_ACCESS: |
384 | alloc = dfacl = nfs3_proc_getacl(inode, |
385 | ACL_TYPE_DEFAULT); |
386 | if (IS_ERR(alloc)) |
387 | goto fail; |
388 | break; |
389 | |
390 | case ACL_TYPE_DEFAULT: |
391 | dfacl = acl; |
392 | alloc = acl = nfs3_proc_getacl(inode, |
393 | ACL_TYPE_ACCESS); |
394 | if (IS_ERR(alloc)) |
395 | goto fail; |
396 | break; |
397 | |
398 | default: |
399 | return -EINVAL; |
400 | } |
401 | } else if (type != ACL_TYPE_ACCESS) |
402 | return -EINVAL; |
403 | |
404 | if (acl == NULL) { |
405 | alloc = acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); |
406 | if (IS_ERR(alloc)) |
407 | goto fail; |
408 | } |
409 | status = nfs3_proc_setacls(inode, acl, dfacl); |
410 | posix_acl_release(alloc); |
411 | return status; |
412 | |
413 | fail: |
414 | return PTR_ERR(alloc); |
415 | } |
416 | |
417 | int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode, |
418 | mode_t mode) |
419 | { |
420 | struct posix_acl *dfacl, *acl; |
421 | int error = 0; |
422 | |
423 | dfacl = nfs3_proc_getacl(dir, ACL_TYPE_DEFAULT); |
424 | if (IS_ERR(dfacl)) { |
425 | error = PTR_ERR(dfacl); |
426 | return (error == -EOPNOTSUPP) ? 0 : error; |
427 | } |
428 | if (!dfacl) |
429 | return 0; |
430 | acl = posix_acl_clone(dfacl, GFP_KERNEL); |
431 | error = -ENOMEM; |
432 | if (!acl) |
433 | goto out_release_dfacl; |
434 | error = posix_acl_create_masq(acl, &mode); |
435 | if (error < 0) |
436 | goto out_release_acl; |
437 | error = nfs3_proc_setacls(inode, acl, S_ISDIR(inode->i_mode) ? |
438 | dfacl : NULL); |
439 | out_release_acl: |
440 | posix_acl_release(acl); |
441 | out_release_dfacl: |
442 | posix_acl_release(dfacl); |
443 | return error; |
444 | } |
445 |
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