blob: 6bbf0e6daad27a3ad91c6b66378ce70012b66304 [file] [log] [blame]
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +00001#include <linux/fs.h>
2#include <linux/nfs.h>
3#include <linux/nfs3.h>
4#include <linux/nfs_fs.h>
Christoph Hellwig334a13e2005-06-28 20:44:58 -07005#include <linux/posix_acl_xattr.h>
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +00006#include <linux/nfsacl.h>
7
Trond Myklebustf41f7412008-06-11 17:39:04 -04008#include "internal.h"
9
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000010#define NFSDBG_FACILITY NFSDBG_PROC
11
12ssize_t nfs3_listxattr(struct dentry *dentry, char *buffer, size_t size)
13{
14 struct inode *inode = dentry->d_inode;
15 struct posix_acl *acl;
16 int pos=0, len=0;
17
18# define output(s) do { \
19 if (pos + sizeof(s) <= size) { \
20 memcpy(buffer + pos, s, sizeof(s)); \
21 pos += sizeof(s); \
22 } \
23 len += sizeof(s); \
24 } while(0)
25
26 acl = nfs3_proc_getacl(inode, ACL_TYPE_ACCESS);
27 if (IS_ERR(acl))
28 return PTR_ERR(acl);
29 if (acl) {
30 output("system.posix_acl_access");
31 posix_acl_release(acl);
32 }
33
34 if (S_ISDIR(inode->i_mode)) {
35 acl = nfs3_proc_getacl(inode, ACL_TYPE_DEFAULT);
36 if (IS_ERR(acl))
37 return PTR_ERR(acl);
38 if (acl) {
39 output("system.posix_acl_default");
40 posix_acl_release(acl);
41 }
42 }
43
44# undef output
45
46 if (!buffer || len <= size)
47 return len;
48 return -ERANGE;
49}
50
51ssize_t nfs3_getxattr(struct dentry *dentry, const char *name,
52 void *buffer, size_t size)
53{
54 struct inode *inode = dentry->d_inode;
55 struct posix_acl *acl;
56 int type, error = 0;
57
Christoph Hellwig334a13e2005-06-28 20:44:58 -070058 if (strcmp(name, POSIX_ACL_XATTR_ACCESS) == 0)
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000059 type = ACL_TYPE_ACCESS;
Christoph Hellwig334a13e2005-06-28 20:44:58 -070060 else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0)
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000061 type = ACL_TYPE_DEFAULT;
62 else
63 return -EOPNOTSUPP;
64
65 acl = nfs3_proc_getacl(inode, type);
66 if (IS_ERR(acl))
67 return PTR_ERR(acl);
68 else if (acl) {
69 if (type == ACL_TYPE_ACCESS && acl->a_count == 0)
70 error = -ENODATA;
71 else
72 error = posix_acl_to_xattr(acl, buffer, size);
73 posix_acl_release(acl);
74 } else
75 error = -ENODATA;
76
77 return error;
78}
79
80int nfs3_setxattr(struct dentry *dentry, const char *name,
81 const void *value, size_t size, int flags)
82{
83 struct inode *inode = dentry->d_inode;
84 struct posix_acl *acl;
85 int type, error;
86
Christoph Hellwig334a13e2005-06-28 20:44:58 -070087 if (strcmp(name, POSIX_ACL_XATTR_ACCESS) == 0)
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000088 type = ACL_TYPE_ACCESS;
Christoph Hellwig334a13e2005-06-28 20:44:58 -070089 else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0)
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000090 type = ACL_TYPE_DEFAULT;
91 else
92 return -EOPNOTSUPP;
93
94 acl = posix_acl_from_xattr(value, size);
95 if (IS_ERR(acl))
96 return PTR_ERR(acl);
97 error = nfs3_proc_setacl(inode, type, acl);
98 posix_acl_release(acl);
99
100 return error;
101}
102
103int nfs3_removexattr(struct dentry *dentry, const char *name)
104{
105 struct inode *inode = dentry->d_inode;
106 int type;
107
Christoph Hellwig334a13e2005-06-28 20:44:58 -0700108 if (strcmp(name, POSIX_ACL_XATTR_ACCESS) == 0)
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000109 type = ACL_TYPE_ACCESS;
Christoph Hellwig334a13e2005-06-28 20:44:58 -0700110 else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0)
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000111 type = ACL_TYPE_DEFAULT;
112 else
113 return -EOPNOTSUPP;
114
115 return nfs3_proc_setacl(inode, type, NULL);
116}
117
Andreas Gruenbacher5c6a9f72005-06-22 17:16:27 +0000118static void __nfs3_forget_cached_acls(struct nfs_inode *nfsi)
119{
Trond Myklebust458818e2005-06-22 17:16:27 +0000120 if (!IS_ERR(nfsi->acl_access)) {
Andreas Gruenbacher5c6a9f72005-06-22 17:16:27 +0000121 posix_acl_release(nfsi->acl_access);
122 nfsi->acl_access = ERR_PTR(-EAGAIN);
123 }
Trond Myklebust458818e2005-06-22 17:16:27 +0000124 if (!IS_ERR(nfsi->acl_default)) {
Andreas Gruenbacher5c6a9f72005-06-22 17:16:27 +0000125 posix_acl_release(nfsi->acl_default);
126 nfsi->acl_default = ERR_PTR(-EAGAIN);
127 }
128}
129
130void nfs3_forget_cached_acls(struct inode *inode)
131{
132 dprintk("NFS: nfs3_forget_cached_acls(%s/%ld)\n", inode->i_sb->s_id,
133 inode->i_ino);
134 spin_lock(&inode->i_lock);
135 __nfs3_forget_cached_acls(NFS_I(inode));
136 spin_unlock(&inode->i_lock);
137}
138
139static struct posix_acl *nfs3_get_cached_acl(struct inode *inode, int type)
140{
141 struct nfs_inode *nfsi = NFS_I(inode);
Trond Myklebust458818e2005-06-22 17:16:27 +0000142 struct posix_acl *acl = ERR_PTR(-EINVAL);
Andreas Gruenbacher5c6a9f72005-06-22 17:16:27 +0000143
144 spin_lock(&inode->i_lock);
145 switch(type) {
146 case ACL_TYPE_ACCESS:
147 acl = nfsi->acl_access;
148 break;
149
150 case ACL_TYPE_DEFAULT:
151 acl = nfsi->acl_default;
152 break;
153
154 default:
Trond Myklebust458818e2005-06-22 17:16:27 +0000155 goto out;
Andreas Gruenbacher5c6a9f72005-06-22 17:16:27 +0000156 }
Trond Myklebust458818e2005-06-22 17:16:27 +0000157 if (IS_ERR(acl))
Andreas Gruenbacher5c6a9f72005-06-22 17:16:27 +0000158 acl = ERR_PTR(-EAGAIN);
159 else
160 acl = posix_acl_dup(acl);
Trond Myklebust458818e2005-06-22 17:16:27 +0000161out:
Andreas Gruenbacher5c6a9f72005-06-22 17:16:27 +0000162 spin_unlock(&inode->i_lock);
163 dprintk("NFS: nfs3_get_cached_acl(%s/%ld, %d) = %p\n", inode->i_sb->s_id,
164 inode->i_ino, type, acl);
165 return acl;
166}
167
168static void nfs3_cache_acls(struct inode *inode, struct posix_acl *acl,
169 struct posix_acl *dfacl)
170{
171 struct nfs_inode *nfsi = NFS_I(inode);
172
173 dprintk("nfs3_cache_acls(%s/%ld, %p, %p)\n", inode->i_sb->s_id,
174 inode->i_ino, acl, dfacl);
175 spin_lock(&inode->i_lock);
176 __nfs3_forget_cached_acls(NFS_I(inode));
Andreas Gruenbacher4814f562006-05-25 01:41:03 -0400177 if (!IS_ERR(acl))
178 nfsi->acl_access = posix_acl_dup(acl);
179 if (!IS_ERR(dfacl))
180 nfsi->acl_default = posix_acl_dup(dfacl);
Andreas Gruenbacher5c6a9f72005-06-22 17:16:27 +0000181 spin_unlock(&inode->i_lock);
182}
183
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000184struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type)
185{
186 struct nfs_server *server = NFS_SERVER(inode);
187 struct nfs_fattr fattr;
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 .fattr = &fattr,
196 };
Chuck Leverdead28d2006-03-20 13:44:23 -0500197 struct rpc_message msg = {
198 .rpc_argp = &args,
199 .rpc_resp = &res,
200 };
Andreas Gruenbacher5c6a9f72005-06-22 17:16:27 +0000201 struct posix_acl *acl;
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000202 int status, count;
203
204 if (!nfs_server_capable(inode, NFS_CAP_ACLS))
205 return ERR_PTR(-EOPNOTSUPP);
206
Andreas Gruenbacher5c6a9f72005-06-22 17:16:27 +0000207 status = nfs_revalidate_inode(server, inode);
208 if (status < 0)
209 return ERR_PTR(status);
Trond Myklebustf41f7412008-06-11 17:39:04 -0400210 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
211 nfs_zap_acl_cache(inode);
Andreas Gruenbacher5c6a9f72005-06-22 17:16:27 +0000212 acl = nfs3_get_cached_acl(inode, type);
213 if (acl != ERR_PTR(-EAGAIN))
214 return acl;
215 acl = NULL;
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000216
Andreas Gruenbacher5c6a9f72005-06-22 17:16:27 +0000217 /*
218 * Only get the access acl when explicitly requested: We don't
219 * need it for access decisions, and only some applications use
220 * it. Applications which request the access acl first are not
221 * penalized from this optimization.
222 */
223 if (type == ACL_TYPE_ACCESS)
224 args.mask |= NFS_ACLCNT|NFS_ACL;
225 if (S_ISDIR(inode->i_mode))
226 args.mask |= NFS_DFACLCNT|NFS_DFACL;
227 if (args.mask == 0)
228 return NULL;
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000229
230 dprintk("NFS call getacl\n");
Chuck Leverdead28d2006-03-20 13:44:23 -0500231 msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_GETACL];
Jeff Laytonf25b8742008-08-18 09:17:58 -0400232 nfs_fattr_init(&fattr);
Chuck Leverdead28d2006-03-20 13:44:23 -0500233 status = rpc_call_sync(server->client_acl, &msg, 0);
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000234 dprintk("NFS reply getacl: %d\n", status);
235
236 /* pages may have been allocated at the xdr layer. */
237 for (count = 0; count < NFSACL_MAXPAGES && args.pages[count]; count++)
238 __free_page(args.pages[count]);
239
240 switch (status) {
241 case 0:
242 status = nfs_refresh_inode(inode, &fattr);
243 break;
244 case -EPFNOSUPPORT:
245 case -EPROTONOSUPPORT:
246 dprintk("NFS_V3_ACL extension not supported; disabling\n");
247 server->caps &= ~NFS_CAP_ACLS;
248 case -ENOTSUPP:
249 status = -EOPNOTSUPP;
250 default:
251 goto getout;
252 }
253 if ((args.mask & res.mask) != args.mask) {
254 status = -EIO;
255 goto getout;
256 }
257
258 if (res.acl_access != NULL) {
259 if (posix_acl_equiv_mode(res.acl_access, NULL) == 0) {
260 posix_acl_release(res.acl_access);
261 res.acl_access = NULL;
262 }
263 }
Andreas Gruenbacher4814f562006-05-25 01:41:03 -0400264 nfs3_cache_acls(inode,
265 (res.mask & NFS_ACL) ? res.acl_access : ERR_PTR(-EINVAL),
266 (res.mask & NFS_DFACL) ? res.acl_default : ERR_PTR(-EINVAL));
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000267
268 switch(type) {
269 case ACL_TYPE_ACCESS:
270 acl = res.acl_access;
271 res.acl_access = NULL;
272 break;
273
274 case ACL_TYPE_DEFAULT:
275 acl = res.acl_default;
276 res.acl_default = NULL;
277 }
278
279getout:
280 posix_acl_release(res.acl_access);
281 posix_acl_release(res.acl_default);
282
283 if (status != 0) {
284 posix_acl_release(acl);
285 acl = ERR_PTR(status);
286 }
287 return acl;
288}
289
290static int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
291 struct posix_acl *dfacl)
292{
293 struct nfs_server *server = NFS_SERVER(inode);
294 struct nfs_fattr fattr;
Trond Myklebustae461412009-03-10 20:33:18 -0400295 struct page *pages[NFSACL_MAXPAGES];
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000296 struct nfs3_setaclargs args = {
297 .inode = inode,
298 .mask = NFS_ACL,
299 .acl_access = acl,
300 .pages = pages,
301 };
Chuck Leverdead28d2006-03-20 13:44:23 -0500302 struct rpc_message msg = {
303 .rpc_argp = &args,
304 .rpc_resp = &fattr,
305 };
Trond Myklebustae461412009-03-10 20:33:18 -0400306 int status;
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000307
308 status = -EOPNOTSUPP;
309 if (!nfs_server_capable(inode, NFS_CAP_ACLS))
310 goto out;
311
312 /* We are doing this here, because XDR marshalling can only
313 return -ENOMEM. */
314 status = -ENOSPC;
315 if (acl != NULL && acl->a_count > NFS_ACL_MAX_ENTRIES)
316 goto out;
317 if (dfacl != NULL && dfacl->a_count > NFS_ACL_MAX_ENTRIES)
318 goto out;
319 if (S_ISDIR(inode->i_mode)) {
320 args.mask |= NFS_DFACL;
321 args.acl_default = dfacl;
Trond Myklebustae461412009-03-10 20:33:18 -0400322 args.len = nfsacl_size(acl, dfacl);
323 } else
324 args.len = nfsacl_size(acl, NULL);
325
326 if (args.len > NFS_ACL_INLINE_BUFSIZE) {
327 unsigned int npages = 1 + ((args.len - 1) >> PAGE_SHIFT);
328
329 status = -ENOMEM;
330 do {
331 args.pages[args.npages] = alloc_page(GFP_KERNEL);
332 if (args.pages[args.npages] == NULL)
333 goto out_freepages;
334 args.npages++;
335 } while (args.npages < npages);
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000336 }
337
338 dprintk("NFS call setacl\n");
Chuck Leverdead28d2006-03-20 13:44:23 -0500339 msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_SETACL];
Jeff Laytonf25b8742008-08-18 09:17:58 -0400340 nfs_fattr_init(&fattr);
Chuck Leverdead28d2006-03-20 13:44:23 -0500341 status = rpc_call_sync(server->client_acl, &msg, 0);
Trond Myklebustf41f7412008-06-11 17:39:04 -0400342 nfs_access_zap_cache(inode);
343 nfs_zap_acl_cache(inode);
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000344 dprintk("NFS reply setacl: %d\n", status);
345
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000346 switch (status) {
347 case 0:
348 status = nfs_refresh_inode(inode, &fattr);
Andreas Gruenbacher4814f562006-05-25 01:41:03 -0400349 nfs3_cache_acls(inode, acl, dfacl);
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000350 break;
351 case -EPFNOSUPPORT:
352 case -EPROTONOSUPPORT:
353 dprintk("NFS_V3_ACL SETACL RPC not supported"
354 "(will not retry)\n");
355 server->caps &= ~NFS_CAP_ACLS;
356 case -ENOTSUPP:
357 status = -EOPNOTSUPP;
358 }
Trond Myklebustae461412009-03-10 20:33:18 -0400359out_freepages:
360 while (args.npages != 0) {
361 args.npages--;
362 __free_page(args.pages[args.npages]);
363 }
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000364out:
365 return status;
366}
367
368int nfs3_proc_setacl(struct inode *inode, int type, struct posix_acl *acl)
369{
370 struct posix_acl *alloc = NULL, *dfacl = NULL;
371 int status;
372
373 if (S_ISDIR(inode->i_mode)) {
374 switch(type) {
375 case ACL_TYPE_ACCESS:
376 alloc = dfacl = nfs3_proc_getacl(inode,
377 ACL_TYPE_DEFAULT);
378 if (IS_ERR(alloc))
379 goto fail;
380 break;
381
382 case ACL_TYPE_DEFAULT:
383 dfacl = acl;
384 alloc = acl = nfs3_proc_getacl(inode,
385 ACL_TYPE_ACCESS);
386 if (IS_ERR(alloc))
387 goto fail;
388 break;
389
390 default:
391 return -EINVAL;
392 }
393 } else if (type != ACL_TYPE_ACCESS)
394 return -EINVAL;
395
396 if (acl == NULL) {
397 alloc = acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
398 if (IS_ERR(alloc))
399 goto fail;
400 }
401 status = nfs3_proc_setacls(inode, acl, dfacl);
402 posix_acl_release(alloc);
403 return status;
404
405fail:
406 return PTR_ERR(alloc);
407}
Andreas Gruenbacher055ffbe2005-06-22 17:16:27 +0000408
409int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode,
410 mode_t mode)
411{
412 struct posix_acl *dfacl, *acl;
413 int error = 0;
414
415 dfacl = nfs3_proc_getacl(dir, ACL_TYPE_DEFAULT);
416 if (IS_ERR(dfacl)) {
417 error = PTR_ERR(dfacl);
418 return (error == -EOPNOTSUPP) ? 0 : error;
419 }
420 if (!dfacl)
421 return 0;
422 acl = posix_acl_clone(dfacl, GFP_KERNEL);
423 error = -ENOMEM;
424 if (!acl)
425 goto out_release_dfacl;
426 error = posix_acl_create_masq(acl, &mode);
427 if (error < 0)
428 goto out_release_acl;
429 error = nfs3_proc_setacls(inode, acl, S_ISDIR(inode->i_mode) ?
430 dfacl : NULL);
431out_release_acl:
432 posix_acl_release(acl);
433out_release_dfacl:
434 posix_acl_release(dfacl);
435 return error;
436}