blob: 9b7362565c0c3b9b8c5dc1610a2c354305ae4999 [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
8#define NFSDBG_FACILITY NFSDBG_PROC
9
10ssize_t nfs3_listxattr(struct dentry *dentry, char *buffer, size_t size)
11{
12 struct inode *inode = dentry->d_inode;
13 struct posix_acl *acl;
14 int pos=0, len=0;
15
16# define output(s) do { \
17 if (pos + sizeof(s) <= size) { \
18 memcpy(buffer + pos, s, sizeof(s)); \
19 pos += sizeof(s); \
20 } \
21 len += sizeof(s); \
22 } while(0)
23
24 acl = nfs3_proc_getacl(inode, ACL_TYPE_ACCESS);
25 if (IS_ERR(acl))
26 return PTR_ERR(acl);
27 if (acl) {
28 output("system.posix_acl_access");
29 posix_acl_release(acl);
30 }
31
32 if (S_ISDIR(inode->i_mode)) {
33 acl = nfs3_proc_getacl(inode, ACL_TYPE_DEFAULT);
34 if (IS_ERR(acl))
35 return PTR_ERR(acl);
36 if (acl) {
37 output("system.posix_acl_default");
38 posix_acl_release(acl);
39 }
40 }
41
42# undef output
43
44 if (!buffer || len <= size)
45 return len;
46 return -ERANGE;
47}
48
49ssize_t nfs3_getxattr(struct dentry *dentry, const char *name,
50 void *buffer, size_t size)
51{
52 struct inode *inode = dentry->d_inode;
53 struct posix_acl *acl;
54 int type, error = 0;
55
Christoph Hellwig334a13e2005-06-28 20:44:58 -070056 if (strcmp(name, POSIX_ACL_XATTR_ACCESS) == 0)
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000057 type = ACL_TYPE_ACCESS;
Christoph Hellwig334a13e2005-06-28 20:44:58 -070058 else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0)
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000059 type = ACL_TYPE_DEFAULT;
60 else
61 return -EOPNOTSUPP;
62
63 acl = nfs3_proc_getacl(inode, type);
64 if (IS_ERR(acl))
65 return PTR_ERR(acl);
66 else if (acl) {
67 if (type == ACL_TYPE_ACCESS && acl->a_count == 0)
68 error = -ENODATA;
69 else
70 error = posix_acl_to_xattr(acl, buffer, size);
71 posix_acl_release(acl);
72 } else
73 error = -ENODATA;
74
75 return error;
76}
77
78int nfs3_setxattr(struct dentry *dentry, const char *name,
79 const void *value, size_t size, int flags)
80{
81 struct inode *inode = dentry->d_inode;
82 struct posix_acl *acl;
83 int type, error;
84
Christoph Hellwig334a13e2005-06-28 20:44:58 -070085 if (strcmp(name, POSIX_ACL_XATTR_ACCESS) == 0)
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000086 type = ACL_TYPE_ACCESS;
Christoph Hellwig334a13e2005-06-28 20:44:58 -070087 else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0)
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000088 type = ACL_TYPE_DEFAULT;
89 else
90 return -EOPNOTSUPP;
91
92 acl = posix_acl_from_xattr(value, size);
93 if (IS_ERR(acl))
94 return PTR_ERR(acl);
95 error = nfs3_proc_setacl(inode, type, acl);
96 posix_acl_release(acl);
97
98 return error;
99}
100
101int nfs3_removexattr(struct dentry *dentry, const char *name)
102{
103 struct inode *inode = dentry->d_inode;
104 int type;
105
Christoph Hellwig334a13e2005-06-28 20:44:58 -0700106 if (strcmp(name, POSIX_ACL_XATTR_ACCESS) == 0)
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000107 type = ACL_TYPE_ACCESS;
Christoph Hellwig334a13e2005-06-28 20:44:58 -0700108 else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0)
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000109 type = ACL_TYPE_DEFAULT;
110 else
111 return -EOPNOTSUPP;
112
113 return nfs3_proc_setacl(inode, type, NULL);
114}
115
Andreas Gruenbacher5c6a9f72005-06-22 17:16:27 +0000116static void __nfs3_forget_cached_acls(struct nfs_inode *nfsi)
117{
Trond Myklebust458818e2005-06-22 17:16:27 +0000118 if (!IS_ERR(nfsi->acl_access)) {
Andreas Gruenbacher5c6a9f72005-06-22 17:16:27 +0000119 posix_acl_release(nfsi->acl_access);
120 nfsi->acl_access = ERR_PTR(-EAGAIN);
121 }
Trond Myklebust458818e2005-06-22 17:16:27 +0000122 if (!IS_ERR(nfsi->acl_default)) {
Andreas Gruenbacher5c6a9f72005-06-22 17:16:27 +0000123 posix_acl_release(nfsi->acl_default);
124 nfsi->acl_default = ERR_PTR(-EAGAIN);
125 }
126}
127
128void nfs3_forget_cached_acls(struct inode *inode)
129{
130 dprintk("NFS: nfs3_forget_cached_acls(%s/%ld)\n", inode->i_sb->s_id,
131 inode->i_ino);
132 spin_lock(&inode->i_lock);
133 __nfs3_forget_cached_acls(NFS_I(inode));
134 spin_unlock(&inode->i_lock);
135}
136
137static struct posix_acl *nfs3_get_cached_acl(struct inode *inode, int type)
138{
139 struct nfs_inode *nfsi = NFS_I(inode);
Trond Myklebust458818e2005-06-22 17:16:27 +0000140 struct posix_acl *acl = ERR_PTR(-EINVAL);
Andreas Gruenbacher5c6a9f72005-06-22 17:16:27 +0000141
142 spin_lock(&inode->i_lock);
143 switch(type) {
144 case ACL_TYPE_ACCESS:
145 acl = nfsi->acl_access;
146 break;
147
148 case ACL_TYPE_DEFAULT:
149 acl = nfsi->acl_default;
150 break;
151
152 default:
Trond Myklebust458818e2005-06-22 17:16:27 +0000153 goto out;
Andreas Gruenbacher5c6a9f72005-06-22 17:16:27 +0000154 }
Trond Myklebust458818e2005-06-22 17:16:27 +0000155 if (IS_ERR(acl))
Andreas Gruenbacher5c6a9f72005-06-22 17:16:27 +0000156 acl = ERR_PTR(-EAGAIN);
157 else
158 acl = posix_acl_dup(acl);
Trond Myklebust458818e2005-06-22 17:16:27 +0000159out:
Andreas Gruenbacher5c6a9f72005-06-22 17:16:27 +0000160 spin_unlock(&inode->i_lock);
161 dprintk("NFS: nfs3_get_cached_acl(%s/%ld, %d) = %p\n", inode->i_sb->s_id,
162 inode->i_ino, type, acl);
163 return acl;
164}
165
166static void nfs3_cache_acls(struct inode *inode, struct posix_acl *acl,
167 struct posix_acl *dfacl)
168{
169 struct nfs_inode *nfsi = NFS_I(inode);
170
171 dprintk("nfs3_cache_acls(%s/%ld, %p, %p)\n", inode->i_sb->s_id,
172 inode->i_ino, acl, dfacl);
173 spin_lock(&inode->i_lock);
174 __nfs3_forget_cached_acls(NFS_I(inode));
Andreas Gruenbacher4814f562006-05-25 01:41:03 -0400175 if (!IS_ERR(acl))
176 nfsi->acl_access = posix_acl_dup(acl);
177 if (!IS_ERR(dfacl))
178 nfsi->acl_default = posix_acl_dup(dfacl);
Andreas Gruenbacher5c6a9f72005-06-22 17:16:27 +0000179 spin_unlock(&inode->i_lock);
180}
181
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000182struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type)
183{
184 struct nfs_server *server = NFS_SERVER(inode);
185 struct nfs_fattr fattr;
186 struct page *pages[NFSACL_MAXPAGES] = { };
187 struct nfs3_getaclargs args = {
188 .fh = NFS_FH(inode),
189 /* The xdr layer may allocate pages here. */
190 .pages = pages,
191 };
192 struct nfs3_getaclres res = {
193 .fattr = &fattr,
194 };
Chuck Leverdead28d2006-03-20 13:44:23 -0500195 struct rpc_message msg = {
196 .rpc_argp = &args,
197 .rpc_resp = &res,
198 };
Andreas Gruenbacher5c6a9f72005-06-22 17:16:27 +0000199 struct posix_acl *acl;
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000200 int status, count;
201
202 if (!nfs_server_capable(inode, NFS_CAP_ACLS))
203 return ERR_PTR(-EOPNOTSUPP);
204
Andreas Gruenbacher5c6a9f72005-06-22 17:16:27 +0000205 status = nfs_revalidate_inode(server, inode);
206 if (status < 0)
207 return ERR_PTR(status);
208 acl = nfs3_get_cached_acl(inode, type);
209 if (acl != ERR_PTR(-EAGAIN))
210 return acl;
211 acl = NULL;
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000212
Andreas Gruenbacher5c6a9f72005-06-22 17:16:27 +0000213 /*
214 * Only get the access acl when explicitly requested: We don't
215 * need it for access decisions, and only some applications use
216 * it. Applications which request the access acl first are not
217 * penalized from this optimization.
218 */
219 if (type == ACL_TYPE_ACCESS)
220 args.mask |= NFS_ACLCNT|NFS_ACL;
221 if (S_ISDIR(inode->i_mode))
222 args.mask |= NFS_DFACLCNT|NFS_DFACL;
223 if (args.mask == 0)
224 return NULL;
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000225
226 dprintk("NFS call getacl\n");
Chuck Leverdead28d2006-03-20 13:44:23 -0500227 msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_GETACL];
228 status = rpc_call_sync(server->client_acl, &msg, 0);
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000229 dprintk("NFS reply getacl: %d\n", status);
230
231 /* pages may have been allocated at the xdr layer. */
232 for (count = 0; count < NFSACL_MAXPAGES && args.pages[count]; count++)
233 __free_page(args.pages[count]);
234
235 switch (status) {
236 case 0:
237 status = nfs_refresh_inode(inode, &fattr);
238 break;
239 case -EPFNOSUPPORT:
240 case -EPROTONOSUPPORT:
241 dprintk("NFS_V3_ACL extension not supported; disabling\n");
242 server->caps &= ~NFS_CAP_ACLS;
243 case -ENOTSUPP:
244 status = -EOPNOTSUPP;
245 default:
246 goto getout;
247 }
248 if ((args.mask & res.mask) != args.mask) {
249 status = -EIO;
250 goto getout;
251 }
252
253 if (res.acl_access != NULL) {
254 if (posix_acl_equiv_mode(res.acl_access, NULL) == 0) {
255 posix_acl_release(res.acl_access);
256 res.acl_access = NULL;
257 }
258 }
Andreas Gruenbacher4814f562006-05-25 01:41:03 -0400259 nfs3_cache_acls(inode,
260 (res.mask & NFS_ACL) ? res.acl_access : ERR_PTR(-EINVAL),
261 (res.mask & NFS_DFACL) ? res.acl_default : ERR_PTR(-EINVAL));
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000262
263 switch(type) {
264 case ACL_TYPE_ACCESS:
265 acl = res.acl_access;
266 res.acl_access = NULL;
267 break;
268
269 case ACL_TYPE_DEFAULT:
270 acl = res.acl_default;
271 res.acl_default = NULL;
272 }
273
274getout:
275 posix_acl_release(res.acl_access);
276 posix_acl_release(res.acl_default);
277
278 if (status != 0) {
279 posix_acl_release(acl);
280 acl = ERR_PTR(status);
281 }
282 return acl;
283}
284
285static int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
286 struct posix_acl *dfacl)
287{
288 struct nfs_server *server = NFS_SERVER(inode);
289 struct nfs_fattr fattr;
290 struct page *pages[NFSACL_MAXPAGES] = { };
291 struct nfs3_setaclargs args = {
292 .inode = inode,
293 .mask = NFS_ACL,
294 .acl_access = acl,
295 .pages = pages,
296 };
Chuck Leverdead28d2006-03-20 13:44:23 -0500297 struct rpc_message msg = {
298 .rpc_argp = &args,
299 .rpc_resp = &fattr,
300 };
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000301 int status, count;
302
303 status = -EOPNOTSUPP;
304 if (!nfs_server_capable(inode, NFS_CAP_ACLS))
305 goto out;
306
307 /* We are doing this here, because XDR marshalling can only
308 return -ENOMEM. */
309 status = -ENOSPC;
310 if (acl != NULL && acl->a_count > NFS_ACL_MAX_ENTRIES)
311 goto out;
312 if (dfacl != NULL && dfacl->a_count > NFS_ACL_MAX_ENTRIES)
313 goto out;
314 if (S_ISDIR(inode->i_mode)) {
315 args.mask |= NFS_DFACL;
316 args.acl_default = dfacl;
317 }
318
319 dprintk("NFS call setacl\n");
Chuck Leverdead28d2006-03-20 13:44:23 -0500320 msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_SETACL];
321 status = rpc_call_sync(server->client_acl, &msg, 0);
Chuck Leverdc592502005-08-18 11:24:12 -0700322 spin_lock(&inode->i_lock);
Chuck Lever55296802005-08-18 11:24:09 -0700323 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS;
Chuck Leverdc592502005-08-18 11:24:12 -0700324 spin_unlock(&inode->i_lock);
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000325 dprintk("NFS reply setacl: %d\n", status);
326
327 /* pages may have been allocated at the xdr layer. */
328 for (count = 0; count < NFSACL_MAXPAGES && args.pages[count]; count++)
329 __free_page(args.pages[count]);
330
331 switch (status) {
332 case 0:
333 status = nfs_refresh_inode(inode, &fattr);
Andreas Gruenbacher4814f562006-05-25 01:41:03 -0400334 nfs3_cache_acls(inode, acl, dfacl);
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +0000335 break;
336 case -EPFNOSUPPORT:
337 case -EPROTONOSUPPORT:
338 dprintk("NFS_V3_ACL SETACL RPC not supported"
339 "(will not retry)\n");
340 server->caps &= ~NFS_CAP_ACLS;
341 case -ENOTSUPP:
342 status = -EOPNOTSUPP;
343 }
344out:
345 return status;
346}
347
348int nfs3_proc_setacl(struct inode *inode, int type, struct posix_acl *acl)
349{
350 struct posix_acl *alloc = NULL, *dfacl = NULL;
351 int status;
352
353 if (S_ISDIR(inode->i_mode)) {
354 switch(type) {
355 case ACL_TYPE_ACCESS:
356 alloc = dfacl = nfs3_proc_getacl(inode,
357 ACL_TYPE_DEFAULT);
358 if (IS_ERR(alloc))
359 goto fail;
360 break;
361
362 case ACL_TYPE_DEFAULT:
363 dfacl = acl;
364 alloc = acl = nfs3_proc_getacl(inode,
365 ACL_TYPE_ACCESS);
366 if (IS_ERR(alloc))
367 goto fail;
368 break;
369
370 default:
371 return -EINVAL;
372 }
373 } else if (type != ACL_TYPE_ACCESS)
374 return -EINVAL;
375
376 if (acl == NULL) {
377 alloc = acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
378 if (IS_ERR(alloc))
379 goto fail;
380 }
381 status = nfs3_proc_setacls(inode, acl, dfacl);
382 posix_acl_release(alloc);
383 return status;
384
385fail:
386 return PTR_ERR(alloc);
387}
Andreas Gruenbacher055ffbe2005-06-22 17:16:27 +0000388
389int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode,
390 mode_t mode)
391{
392 struct posix_acl *dfacl, *acl;
393 int error = 0;
394
395 dfacl = nfs3_proc_getacl(dir, ACL_TYPE_DEFAULT);
396 if (IS_ERR(dfacl)) {
397 error = PTR_ERR(dfacl);
398 return (error == -EOPNOTSUPP) ? 0 : error;
399 }
400 if (!dfacl)
401 return 0;
402 acl = posix_acl_clone(dfacl, GFP_KERNEL);
403 error = -ENOMEM;
404 if (!acl)
405 goto out_release_dfacl;
406 error = posix_acl_create_masq(acl, &mode);
407 if (error < 0)
408 goto out_release_acl;
409 error = nfs3_proc_setacls(inode, acl, S_ISDIR(inode->i_mode) ?
410 dfacl : NULL);
411out_release_acl:
412 posix_acl_release(acl);
413out_release_dfacl:
414 posix_acl_release(dfacl);
415 return error;
416}