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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
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 /* The xdr layer may allocate pages here. */
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 * 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
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 /* 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);
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}
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/fs.h>
3#include <linux/gfp.h>
4#include <linux/nfs.h>
5#include <linux/nfs3.h>
6#include <linux/nfs_fs.h>
7#include <linux/posix_acl_xattr.h>
8#include <linux/nfsacl.h>
9
10#include "internal.h"
11#include "nfs3_fs.h"
12
13#define NFSDBG_FACILITY NFSDBG_PROC
14
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 */
20static void nfs3_prepare_get_acl(struct posix_acl **p)
21{
22 struct posix_acl *sentinel = uncached_acl_sentinel(current);
23
24 /* If the ACL isn't being read yet, set our sentinel. */
25 cmpxchg(p, ACL_NOT_CACHED, sentinel);
26}
27
28static void nfs3_complete_get_acl(struct posix_acl **p, struct posix_acl *acl)
29{
30 struct posix_acl *sentinel = uncached_acl_sentinel(current);
31
32 /* Only cache the ACL if our sentinel is still in place. */
33 posix_acl_dup(acl);
34 if (cmpxchg(p, sentinel, acl) != sentinel)
35 posix_acl_release(acl);
36}
37
38static void nfs3_abort_get_acl(struct posix_acl **p)
39{
40 struct posix_acl *sentinel = uncached_acl_sentinel(current);
41
42 /* Remove our sentinel upon failure. */
43 cmpxchg(p, sentinel, ACL_NOT_CACHED);
44}
45
46struct posix_acl *nfs3_get_acl(struct inode *inode, int type, bool rcu)
47{
48 struct nfs_server *server = NFS_SERVER(inode);
49 struct page *pages[NFSACL_MAXPAGES] = { };
50 struct nfs3_getaclargs args = {
51 .fh = NFS_FH(inode),
52 /* The xdr layer may allocate pages here. */
53 .pages = pages,
54 };
55 struct nfs3_getaclres res = {
56 NULL,
57 };
58 struct rpc_message msg = {
59 .rpc_argp = &args,
60 .rpc_resp = &res,
61 };
62 int status, count;
63
64 if (rcu)
65 return ERR_PTR(-ECHILD);
66
67 if (!nfs_server_capable(inode, NFS_CAP_ACLS))
68 return ERR_PTR(-EOPNOTSUPP);
69
70 status = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
71 if (status < 0)
72 return ERR_PTR(status);
73
74 /*
75 * Only get the access acl when explicitly requested: We don't
76 * need it for access decisions, and only some applications use
77 * it. Applications which request the access acl first are not
78 * penalized from this optimization.
79 */
80 if (type == ACL_TYPE_ACCESS)
81 args.mask |= NFS_ACLCNT|NFS_ACL;
82 if (S_ISDIR(inode->i_mode))
83 args.mask |= NFS_DFACLCNT|NFS_DFACL;
84 if (args.mask == 0)
85 return NULL;
86
87 dprintk("NFS call getacl\n");
88 msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_GETACL];
89 res.fattr = nfs_alloc_fattr();
90 if (res.fattr == NULL)
91 return ERR_PTR(-ENOMEM);
92
93 if (args.mask & NFS_ACL)
94 nfs3_prepare_get_acl(&inode->i_acl);
95 if (args.mask & NFS_DFACL)
96 nfs3_prepare_get_acl(&inode->i_default_acl);
97
98 status = rpc_call_sync(server->client_acl, &msg, 0);
99 dprintk("NFS reply getacl: %d\n", status);
100
101 /* pages may have been allocated at the xdr layer. */
102 for (count = 0; count < NFSACL_MAXPAGES && args.pages[count]; count++)
103 __free_page(args.pages[count]);
104
105 switch (status) {
106 case 0:
107 status = nfs_refresh_inode(inode, res.fattr);
108 break;
109 case -EPFNOSUPPORT:
110 case -EPROTONOSUPPORT:
111 dprintk("NFS_V3_ACL extension not supported; disabling\n");
112 server->caps &= ~NFS_CAP_ACLS;
113 fallthrough;
114 case -ENOTSUPP:
115 status = -EOPNOTSUPP;
116 goto getout;
117 default:
118 goto getout;
119 }
120 if ((args.mask & res.mask) != args.mask) {
121 status = -EIO;
122 goto getout;
123 }
124
125 if (res.acl_access != NULL) {
126 if ((posix_acl_equiv_mode(res.acl_access, NULL) == 0) ||
127 res.acl_access->a_count == 0) {
128 posix_acl_release(res.acl_access);
129 res.acl_access = NULL;
130 }
131 }
132
133 if (res.mask & NFS_ACL)
134 nfs3_complete_get_acl(&inode->i_acl, res.acl_access);
135 else
136 forget_cached_acl(inode, ACL_TYPE_ACCESS);
137
138 if (res.mask & NFS_DFACL)
139 nfs3_complete_get_acl(&inode->i_default_acl, res.acl_default);
140 else
141 forget_cached_acl(inode, ACL_TYPE_DEFAULT);
142
143 nfs_free_fattr(res.fattr);
144 if (type == ACL_TYPE_ACCESS) {
145 posix_acl_release(res.acl_default);
146 return res.acl_access;
147 } else {
148 posix_acl_release(res.acl_access);
149 return res.acl_default;
150 }
151
152getout:
153 nfs3_abort_get_acl(&inode->i_acl);
154 nfs3_abort_get_acl(&inode->i_default_acl);
155 posix_acl_release(res.acl_access);
156 posix_acl_release(res.acl_default);
157 nfs_free_fattr(res.fattr);
158 return ERR_PTR(status);
159}
160
161static int __nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
162 struct posix_acl *dfacl)
163{
164 struct nfs_server *server = NFS_SERVER(inode);
165 struct nfs_fattr *fattr;
166 struct page *pages[NFSACL_MAXPAGES];
167 struct nfs3_setaclargs args = {
168 .inode = inode,
169 .mask = NFS_ACL,
170 .acl_access = acl,
171 .pages = pages,
172 };
173 struct rpc_message msg = {
174 .rpc_argp = &args,
175 .rpc_resp = &fattr,
176 };
177 int status = 0;
178
179 if (acl == NULL && (!S_ISDIR(inode->i_mode) || dfacl == NULL))
180 goto out;
181
182 status = -EOPNOTSUPP;
183 if (!nfs_server_capable(inode, NFS_CAP_ACLS))
184 goto out;
185
186 /* We are doing this here because XDR marshalling does not
187 * return any results, it BUGs. */
188 status = -ENOSPC;
189 if (acl != NULL && acl->a_count > NFS_ACL_MAX_ENTRIES)
190 goto out;
191 if (dfacl != NULL && dfacl->a_count > NFS_ACL_MAX_ENTRIES)
192 goto out;
193 if (S_ISDIR(inode->i_mode)) {
194 args.mask |= NFS_DFACL;
195 args.acl_default = dfacl;
196 args.len = nfsacl_size(acl, dfacl);
197 } else
198 args.len = nfsacl_size(acl, NULL);
199
200 if (args.len > NFS_ACL_INLINE_BUFSIZE) {
201 unsigned int npages = 1 + ((args.len - 1) >> PAGE_SHIFT);
202
203 status = -ENOMEM;
204 do {
205 args.pages[args.npages] = alloc_page(GFP_KERNEL);
206 if (args.pages[args.npages] == NULL)
207 goto out_freepages;
208 args.npages++;
209 } while (args.npages < npages);
210 }
211
212 dprintk("NFS call setacl\n");
213 status = -ENOMEM;
214 fattr = nfs_alloc_fattr();
215 if (fattr == NULL)
216 goto out_freepages;
217
218 msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_SETACL];
219 msg.rpc_resp = fattr;
220 status = rpc_call_sync(server->client_acl, &msg, 0);
221 nfs_access_zap_cache(inode);
222 nfs_zap_acl_cache(inode);
223 dprintk("NFS reply setacl: %d\n", status);
224
225 switch (status) {
226 case 0:
227 status = nfs_refresh_inode(inode, fattr);
228 break;
229 case -EPFNOSUPPORT:
230 case -EPROTONOSUPPORT:
231 dprintk("NFS_V3_ACL SETACL RPC not supported"
232 "(will not retry)\n");
233 server->caps &= ~NFS_CAP_ACLS;
234 fallthrough;
235 case -ENOTSUPP:
236 status = -EOPNOTSUPP;
237 }
238 nfs_free_fattr(fattr);
239out_freepages:
240 while (args.npages != 0) {
241 args.npages--;
242 __free_page(args.pages[args.npages]);
243 }
244out:
245 return status;
246}
247
248int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
249 struct posix_acl *dfacl)
250{
251 int ret;
252 ret = __nfs3_proc_setacls(inode, acl, dfacl);
253 return (ret == -EOPNOTSUPP) ? 0 : ret;
254
255}
256
257int nfs3_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
258 struct posix_acl *acl, int type)
259{
260 struct posix_acl *orig = acl, *dfacl = NULL, *alloc;
261 struct inode *inode = d_inode(dentry);
262 int status;
263
264 if (S_ISDIR(inode->i_mode)) {
265 switch(type) {
266 case ACL_TYPE_ACCESS:
267 alloc = get_inode_acl(inode, ACL_TYPE_DEFAULT);
268 if (IS_ERR(alloc))
269 goto fail;
270 dfacl = alloc;
271 break;
272
273 case ACL_TYPE_DEFAULT:
274 alloc = get_inode_acl(inode, ACL_TYPE_ACCESS);
275 if (IS_ERR(alloc))
276 goto fail;
277 dfacl = acl;
278 acl = alloc;
279 break;
280 }
281 }
282
283 if (acl == NULL) {
284 alloc = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
285 if (IS_ERR(alloc))
286 goto fail;
287 acl = alloc;
288 }
289 status = __nfs3_proc_setacls(inode, acl, dfacl);
290out:
291 if (acl != orig)
292 posix_acl_release(acl);
293 if (dfacl != orig)
294 posix_acl_release(dfacl);
295 return status;
296
297fail:
298 status = PTR_ERR(alloc);
299 goto out;
300}
301
302static int
303nfs3_list_one_acl(struct inode *inode, int type, const char *name, void *data,
304 size_t size, ssize_t *result)
305{
306 struct posix_acl *acl;
307 char *p = data + *result;
308
309 acl = get_inode_acl(inode, type);
310 if (IS_ERR_OR_NULL(acl))
311 return 0;
312
313 posix_acl_release(acl);
314
315 *result += strlen(name);
316 *result += 1;
317 if (!size)
318 return 0;
319 if (*result > size)
320 return -ERANGE;
321
322 strcpy(p, name);
323 return 0;
324}
325
326ssize_t
327nfs3_listxattr(struct dentry *dentry, char *data, size_t size)
328{
329 struct inode *inode = d_inode(dentry);
330 ssize_t result = 0;
331 int error;
332
333 error = nfs3_list_one_acl(inode, ACL_TYPE_ACCESS,
334 XATTR_NAME_POSIX_ACL_ACCESS, data, size, &result);
335 if (error)
336 return error;
337
338 error = nfs3_list_one_acl(inode, ACL_TYPE_DEFAULT,
339 XATTR_NAME_POSIX_ACL_DEFAULT, data, size, &result);
340 if (error)
341 return error;
342 return result;
343}