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
13ssize_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
52ssize_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
81int 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
104int 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
119static 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
131void 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
140static 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);
162out:
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
169static 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
185struct 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
192 .pages = pages,
193 };
194 struct nfs3_getaclres res = {
195 NULL,
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
217
218
219
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
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
280getout:
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
292static 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
315
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);
367out_freepages:
368 while (args.npages != 0) {
369 args.npages--;
370 __free_page(args.pages[args.npages]);
371 }
372out:
373 return status;
374}
375
376int 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
413fail:
414 return PTR_ERR(alloc);
415}
416
417int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode,
418 umode_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_dup(dfacl);
431 error = posix_acl_create(&acl, GFP_KERNEL, &mode);
432 if (error < 0)
433 goto out_release_dfacl;
434 error = nfs3_proc_setacls(inode, acl, S_ISDIR(inode->i_mode) ?
435 dfacl : NULL);
436 posix_acl_release(acl);
437out_release_dfacl:
438 posix_acl_release(dfacl);
439 return error;
440}
441
