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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 (cmpxchg(p, ACL_NOT_CACHED, sentinel) != ACL_NOT_CACHED) {
25 /* Not the first reader or sentinel already in place. */
26 }
27}
28
29static void nfs3_complete_get_acl(struct posix_acl **p, struct posix_acl *acl)
30{
31 struct posix_acl *sentinel = uncached_acl_sentinel(current);
32
33 /* Only cache the ACL if our sentinel is still in place. */
34 posix_acl_dup(acl);
35 if (cmpxchg(p, sentinel, acl) != sentinel)
36 posix_acl_release(acl);
37}
38
39static void nfs3_abort_get_acl(struct posix_acl **p)
40{
41 struct posix_acl *sentinel = uncached_acl_sentinel(current);
42
43 /* Remove our sentinel upon failure. */
44 cmpxchg(p, sentinel, ACL_NOT_CACHED);
45}
46
47struct posix_acl *nfs3_get_acl(struct inode *inode, int type)
48{
49 struct nfs_server *server = NFS_SERVER(inode);
50 struct page *pages[NFSACL_MAXPAGES] = { };
51 struct nfs3_getaclargs args = {
52 .fh = NFS_FH(inode),
53 /* The xdr layer may allocate pages here. */
54 .pages = pages,
55 };
56 struct nfs3_getaclres res = {
57 NULL,
58 };
59 struct rpc_message msg = {
60 .rpc_argp = &args,
61 .rpc_resp = &res,
62 };
63 int status, count;
64
65 if (!nfs_server_capable(inode, NFS_CAP_ACLS))
66 return ERR_PTR(-EOPNOTSUPP);
67
68 status = nfs_revalidate_inode(server, inode);
69 if (status < 0)
70 return ERR_PTR(status);
71
72 /*
73 * Only get the access acl when explicitly requested: We don't
74 * need it for access decisions, and only some applications use
75 * it. Applications which request the access acl first are not
76 * penalized from this optimization.
77 */
78 if (type == ACL_TYPE_ACCESS)
79 args.mask |= NFS_ACLCNT|NFS_ACL;
80 if (S_ISDIR(inode->i_mode))
81 args.mask |= NFS_DFACLCNT|NFS_DFACL;
82 if (args.mask == 0)
83 return NULL;
84
85 dprintk("NFS call getacl\n");
86 msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_GETACL];
87 res.fattr = nfs_alloc_fattr();
88 if (res.fattr == NULL)
89 return ERR_PTR(-ENOMEM);
90
91 if (args.mask & NFS_ACL)
92 nfs3_prepare_get_acl(&inode->i_acl);
93 if (args.mask & NFS_DFACL)
94 nfs3_prepare_get_acl(&inode->i_default_acl);
95
96 status = rpc_call_sync(server->client_acl, &msg, 0);
97 dprintk("NFS reply getacl: %d\n", status);
98
99 /* pages may have been allocated at the xdr layer. */
100 for (count = 0; count < NFSACL_MAXPAGES && args.pages[count]; count++)
101 __free_page(args.pages[count]);
102
103 switch (status) {
104 case 0:
105 status = nfs_refresh_inode(inode, res.fattr);
106 break;
107 case -EPFNOSUPPORT:
108 case -EPROTONOSUPPORT:
109 dprintk("NFS_V3_ACL extension not supported; disabling\n");
110 server->caps &= ~NFS_CAP_ACLS;
111 case -ENOTSUPP:
112 status = -EOPNOTSUPP;
113 default:
114 goto getout;
115 }
116 if ((args.mask & res.mask) != args.mask) {
117 status = -EIO;
118 goto getout;
119 }
120
121 if (res.acl_access != NULL) {
122 if ((posix_acl_equiv_mode(res.acl_access, NULL) == 0) ||
123 res.acl_access->a_count == 0) {
124 posix_acl_release(res.acl_access);
125 res.acl_access = NULL;
126 }
127 }
128
129 if (res.mask & NFS_ACL)
130 nfs3_complete_get_acl(&inode->i_acl, res.acl_access);
131 else
132 forget_cached_acl(inode, ACL_TYPE_ACCESS);
133
134 if (res.mask & NFS_DFACL)
135 nfs3_complete_get_acl(&inode->i_default_acl, res.acl_default);
136 else
137 forget_cached_acl(inode, ACL_TYPE_DEFAULT);
138
139 nfs_free_fattr(res.fattr);
140 if (type == ACL_TYPE_ACCESS) {
141 posix_acl_release(res.acl_default);
142 return res.acl_access;
143 } else {
144 posix_acl_release(res.acl_access);
145 return res.acl_default;
146 }
147
148getout:
149 nfs3_abort_get_acl(&inode->i_acl);
150 nfs3_abort_get_acl(&inode->i_default_acl);
151 posix_acl_release(res.acl_access);
152 posix_acl_release(res.acl_default);
153 nfs_free_fattr(res.fattr);
154 return ERR_PTR(status);
155}
156
157static int __nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
158 struct posix_acl *dfacl)
159{
160 struct nfs_server *server = NFS_SERVER(inode);
161 struct nfs_fattr *fattr;
162 struct page *pages[NFSACL_MAXPAGES];
163 struct nfs3_setaclargs args = {
164 .inode = inode,
165 .mask = NFS_ACL,
166 .acl_access = acl,
167 .pages = pages,
168 };
169 struct rpc_message msg = {
170 .rpc_argp = &args,
171 .rpc_resp = &fattr,
172 };
173 int status = 0;
174
175 if (acl == NULL && (!S_ISDIR(inode->i_mode) || dfacl == NULL))
176 goto out;
177
178 status = -EOPNOTSUPP;
179 if (!nfs_server_capable(inode, NFS_CAP_ACLS))
180 goto out;
181
182 /* We are doing this here because XDR marshalling does not
183 * return any results, it BUGs. */
184 status = -ENOSPC;
185 if (acl != NULL && acl->a_count > NFS_ACL_MAX_ENTRIES)
186 goto out;
187 if (dfacl != NULL && dfacl->a_count > NFS_ACL_MAX_ENTRIES)
188 goto out;
189 if (S_ISDIR(inode->i_mode)) {
190 args.mask |= NFS_DFACL;
191 args.acl_default = dfacl;
192 args.len = nfsacl_size(acl, dfacl);
193 } else
194 args.len = nfsacl_size(acl, NULL);
195
196 if (args.len > NFS_ACL_INLINE_BUFSIZE) {
197 unsigned int npages = 1 + ((args.len - 1) >> PAGE_SHIFT);
198
199 status = -ENOMEM;
200 do {
201 args.pages[args.npages] = alloc_page(GFP_KERNEL);
202 if (args.pages[args.npages] == NULL)
203 goto out_freepages;
204 args.npages++;
205 } while (args.npages < npages);
206 }
207
208 dprintk("NFS call setacl\n");
209 status = -ENOMEM;
210 fattr = nfs_alloc_fattr();
211 if (fattr == NULL)
212 goto out_freepages;
213
214 msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_SETACL];
215 msg.rpc_resp = fattr;
216 status = rpc_call_sync(server->client_acl, &msg, 0);
217 nfs_access_zap_cache(inode);
218 nfs_zap_acl_cache(inode);
219 dprintk("NFS reply setacl: %d\n", status);
220
221 switch (status) {
222 case 0:
223 status = nfs_refresh_inode(inode, fattr);
224 set_cached_acl(inode, ACL_TYPE_ACCESS, acl);
225 set_cached_acl(inode, ACL_TYPE_DEFAULT, dfacl);
226 break;
227 case -EPFNOSUPPORT:
228 case -EPROTONOSUPPORT:
229 dprintk("NFS_V3_ACL SETACL RPC not supported"
230 "(will not retry)\n");
231 server->caps &= ~NFS_CAP_ACLS;
232 case -ENOTSUPP:
233 status = -EOPNOTSUPP;
234 }
235 nfs_free_fattr(fattr);
236out_freepages:
237 while (args.npages != 0) {
238 args.npages--;
239 __free_page(args.pages[args.npages]);
240 }
241out:
242 return status;
243}
244
245int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
246 struct posix_acl *dfacl)
247{
248 int ret;
249 ret = __nfs3_proc_setacls(inode, acl, dfacl);
250 return (ret == -EOPNOTSUPP) ? 0 : ret;
251
252}
253
254int nfs3_set_acl(struct inode *inode, struct posix_acl *acl, int type)
255{
256 struct posix_acl *alloc = NULL, *dfacl = NULL;
257 int status;
258
259 if (S_ISDIR(inode->i_mode)) {
260 switch(type) {
261 case ACL_TYPE_ACCESS:
262 alloc = dfacl = get_acl(inode, ACL_TYPE_DEFAULT);
263 if (IS_ERR(alloc))
264 goto fail;
265 break;
266
267 case ACL_TYPE_DEFAULT:
268 dfacl = acl;
269 alloc = acl = get_acl(inode, ACL_TYPE_ACCESS);
270 if (IS_ERR(alloc))
271 goto fail;
272 break;
273 }
274 }
275
276 if (acl == NULL) {
277 alloc = acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
278 if (IS_ERR(alloc))
279 goto fail;
280 }
281 status = __nfs3_proc_setacls(inode, acl, dfacl);
282 posix_acl_release(alloc);
283 return status;
284
285fail:
286 return PTR_ERR(alloc);
287}
288
289const struct xattr_handler *nfs3_xattr_handlers[] = {
290 &posix_acl_access_xattr_handler,
291 &posix_acl_default_xattr_handler,
292 NULL,
293};
294
295static int
296nfs3_list_one_acl(struct inode *inode, int type, const char *name, void *data,
297 size_t size, ssize_t *result)
298{
299 struct posix_acl *acl;
300 char *p = data + *result;
301
302 acl = get_acl(inode, type);
303 if (IS_ERR_OR_NULL(acl))
304 return 0;
305
306 posix_acl_release(acl);
307
308 *result += strlen(name);
309 *result += 1;
310 if (!size)
311 return 0;
312 if (*result > size)
313 return -ERANGE;
314
315 strcpy(p, name);
316 return 0;
317}
318
319ssize_t
320nfs3_listxattr(struct dentry *dentry, char *data, size_t size)
321{
322 struct inode *inode = d_inode(dentry);
323 ssize_t result = 0;
324 int error;
325
326 error = nfs3_list_one_acl(inode, ACL_TYPE_ACCESS,
327 XATTR_NAME_POSIX_ACL_ACCESS, data, size, &result);
328 if (error)
329 return error;
330
331 error = nfs3_list_one_acl(inode, ACL_TYPE_DEFAULT,
332 XATTR_NAME_POSIX_ACL_DEFAULT, data, size, &result);
333 if (error)
334 return error;
335 return result;
336}
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}