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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#include "nfs3_fs.h"
11
12#define NFSDBG_FACILITY NFSDBG_PROC
13
14struct posix_acl *nfs3_get_acl(struct inode *inode, int type)
15{
16 struct nfs_server *server = NFS_SERVER(inode);
17 struct page *pages[NFSACL_MAXPAGES] = { };
18 struct nfs3_getaclargs args = {
19 .fh = NFS_FH(inode),
20 /* The xdr layer may allocate pages here. */
21 .pages = pages,
22 };
23 struct nfs3_getaclres res = {
24 NULL,
25 };
26 struct rpc_message msg = {
27 .rpc_argp = &args,
28 .rpc_resp = &res,
29 };
30 int status, count;
31
32 if (!nfs_server_capable(inode, NFS_CAP_ACLS))
33 return ERR_PTR(-EOPNOTSUPP);
34
35 status = nfs_revalidate_inode(server, inode);
36 if (status < 0)
37 return ERR_PTR(status);
38
39 /*
40 * Only get the access acl when explicitly requested: We don't
41 * need it for access decisions, and only some applications use
42 * it. Applications which request the access acl first are not
43 * penalized from this optimization.
44 */
45 if (type == ACL_TYPE_ACCESS)
46 args.mask |= NFS_ACLCNT|NFS_ACL;
47 if (S_ISDIR(inode->i_mode))
48 args.mask |= NFS_DFACLCNT|NFS_DFACL;
49 if (args.mask == 0)
50 return NULL;
51
52 dprintk("NFS call getacl\n");
53 msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_GETACL];
54 res.fattr = nfs_alloc_fattr();
55 if (res.fattr == NULL)
56 return ERR_PTR(-ENOMEM);
57
58 status = rpc_call_sync(server->client_acl, &msg, 0);
59 dprintk("NFS reply getacl: %d\n", status);
60
61 /* pages may have been allocated at the xdr layer. */
62 for (count = 0; count < NFSACL_MAXPAGES && args.pages[count]; count++)
63 __free_page(args.pages[count]);
64
65 switch (status) {
66 case 0:
67 status = nfs_refresh_inode(inode, res.fattr);
68 break;
69 case -EPFNOSUPPORT:
70 case -EPROTONOSUPPORT:
71 dprintk("NFS_V3_ACL extension not supported; disabling\n");
72 server->caps &= ~NFS_CAP_ACLS;
73 case -ENOTSUPP:
74 status = -EOPNOTSUPP;
75 default:
76 goto getout;
77 }
78 if ((args.mask & res.mask) != args.mask) {
79 status = -EIO;
80 goto getout;
81 }
82
83 if (res.acl_access != NULL) {
84 if ((posix_acl_equiv_mode(res.acl_access, NULL) == 0) ||
85 res.acl_access->a_count == 0) {
86 posix_acl_release(res.acl_access);
87 res.acl_access = NULL;
88 }
89 }
90
91 if (res.mask & NFS_ACL)
92 set_cached_acl(inode, ACL_TYPE_ACCESS, res.acl_access);
93 else
94 forget_cached_acl(inode, ACL_TYPE_ACCESS);
95
96 if (res.mask & NFS_DFACL)
97 set_cached_acl(inode, ACL_TYPE_DEFAULT, res.acl_default);
98 else
99 forget_cached_acl(inode, ACL_TYPE_DEFAULT);
100
101 nfs_free_fattr(res.fattr);
102 if (type == ACL_TYPE_ACCESS) {
103 posix_acl_release(res.acl_default);
104 return res.acl_access;
105 } else {
106 posix_acl_release(res.acl_access);
107 return res.acl_default;
108 }
109
110getout:
111 posix_acl_release(res.acl_access);
112 posix_acl_release(res.acl_default);
113 nfs_free_fattr(res.fattr);
114 return ERR_PTR(status);
115}
116
117static int __nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
118 struct posix_acl *dfacl)
119{
120 struct nfs_server *server = NFS_SERVER(inode);
121 struct nfs_fattr *fattr;
122 struct page *pages[NFSACL_MAXPAGES];
123 struct nfs3_setaclargs args = {
124 .inode = inode,
125 .mask = NFS_ACL,
126 .acl_access = acl,
127 .pages = pages,
128 };
129 struct rpc_message msg = {
130 .rpc_argp = &args,
131 .rpc_resp = &fattr,
132 };
133 int status = 0;
134
135 if (acl == NULL && (!S_ISDIR(inode->i_mode) || dfacl == NULL))
136 goto out;
137
138 status = -EOPNOTSUPP;
139 if (!nfs_server_capable(inode, NFS_CAP_ACLS))
140 goto out;
141
142 /* We are doing this here because XDR marshalling does not
143 * return any results, it BUGs. */
144 status = -ENOSPC;
145 if (acl != NULL && acl->a_count > NFS_ACL_MAX_ENTRIES)
146 goto out;
147 if (dfacl != NULL && dfacl->a_count > NFS_ACL_MAX_ENTRIES)
148 goto out;
149 if (S_ISDIR(inode->i_mode)) {
150 args.mask |= NFS_DFACL;
151 args.acl_default = dfacl;
152 args.len = nfsacl_size(acl, dfacl);
153 } else
154 args.len = nfsacl_size(acl, NULL);
155
156 if (args.len > NFS_ACL_INLINE_BUFSIZE) {
157 unsigned int npages = 1 + ((args.len - 1) >> PAGE_SHIFT);
158
159 status = -ENOMEM;
160 do {
161 args.pages[args.npages] = alloc_page(GFP_KERNEL);
162 if (args.pages[args.npages] == NULL)
163 goto out_freepages;
164 args.npages++;
165 } while (args.npages < npages);
166 }
167
168 dprintk("NFS call setacl\n");
169 status = -ENOMEM;
170 fattr = nfs_alloc_fattr();
171 if (fattr == NULL)
172 goto out_freepages;
173
174 msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_SETACL];
175 msg.rpc_resp = fattr;
176 status = rpc_call_sync(server->client_acl, &msg, 0);
177 nfs_access_zap_cache(inode);
178 nfs_zap_acl_cache(inode);
179 dprintk("NFS reply setacl: %d\n", status);
180
181 switch (status) {
182 case 0:
183 status = nfs_refresh_inode(inode, fattr);
184 set_cached_acl(inode, ACL_TYPE_ACCESS, acl);
185 set_cached_acl(inode, ACL_TYPE_DEFAULT, dfacl);
186 break;
187 case -EPFNOSUPPORT:
188 case -EPROTONOSUPPORT:
189 dprintk("NFS_V3_ACL SETACL RPC not supported"
190 "(will not retry)\n");
191 server->caps &= ~NFS_CAP_ACLS;
192 case -ENOTSUPP:
193 status = -EOPNOTSUPP;
194 }
195 nfs_free_fattr(fattr);
196out_freepages:
197 while (args.npages != 0) {
198 args.npages--;
199 __free_page(args.pages[args.npages]);
200 }
201out:
202 return status;
203}
204
205int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
206 struct posix_acl *dfacl)
207{
208 int ret;
209 ret = __nfs3_proc_setacls(inode, acl, dfacl);
210 return (ret == -EOPNOTSUPP) ? 0 : ret;
211
212}
213
214int nfs3_set_acl(struct inode *inode, struct posix_acl *acl, int type)
215{
216 struct posix_acl *alloc = NULL, *dfacl = NULL;
217 int status;
218
219 if (S_ISDIR(inode->i_mode)) {
220 switch(type) {
221 case ACL_TYPE_ACCESS:
222 alloc = dfacl = get_acl(inode, ACL_TYPE_DEFAULT);
223 if (IS_ERR(alloc))
224 goto fail;
225 break;
226
227 case ACL_TYPE_DEFAULT:
228 dfacl = acl;
229 alloc = acl = get_acl(inode, ACL_TYPE_ACCESS);
230 if (IS_ERR(alloc))
231 goto fail;
232 break;
233 }
234 }
235
236 if (acl == NULL) {
237 alloc = acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
238 if (IS_ERR(alloc))
239 goto fail;
240 }
241 status = __nfs3_proc_setacls(inode, acl, dfacl);
242 posix_acl_release(alloc);
243 return status;
244
245fail:
246 return PTR_ERR(alloc);
247}
248
249const struct xattr_handler *nfs3_xattr_handlers[] = {
250 &posix_acl_access_xattr_handler,
251 &posix_acl_default_xattr_handler,
252 NULL,
253};
254
255static int
256nfs3_list_one_acl(struct inode *inode, int type, const char *name, void *data,
257 size_t size, ssize_t *result)
258{
259 struct posix_acl *acl;
260 char *p = data + *result;
261
262 acl = get_acl(inode, type);
263 if (IS_ERR_OR_NULL(acl))
264 return 0;
265
266 posix_acl_release(acl);
267
268 *result += strlen(name);
269 *result += 1;
270 if (!size)
271 return 0;
272 if (*result > size)
273 return -ERANGE;
274
275 strcpy(p, name);
276 return 0;
277}
278
279ssize_t
280nfs3_listxattr(struct dentry *dentry, char *data, size_t size)
281{
282 struct inode *inode = d_inode(dentry);
283 ssize_t result = 0;
284 int error;
285
286 error = nfs3_list_one_acl(inode, ACL_TYPE_ACCESS,
287 XATTR_NAME_POSIX_ACL_ACCESS, data, size, &result);
288 if (error)
289 return error;
290
291 error = nfs3_list_one_acl(inode, ACL_TYPE_DEFAULT,
292 XATTR_NAME_POSIX_ACL_DEFAULT, data, size, &result);
293 if (error)
294 return error;
295 return result;
296}
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
13struct posix_acl *nfs3_get_acl(struct inode *inode, int type)
14{
15 struct nfs_server *server = NFS_SERVER(inode);
16 struct page *pages[NFSACL_MAXPAGES] = { };
17 struct nfs3_getaclargs args = {
18 .fh = NFS_FH(inode),
19 /* The xdr layer may allocate pages here. */
20 .pages = pages,
21 };
22 struct nfs3_getaclres res = {
23 NULL,
24 };
25 struct rpc_message msg = {
26 .rpc_argp = &args,
27 .rpc_resp = &res,
28 };
29 int status, count;
30
31 if (!nfs_server_capable(inode, NFS_CAP_ACLS))
32 return ERR_PTR(-EOPNOTSUPP);
33
34 status = nfs_revalidate_inode(server, inode);
35 if (status < 0)
36 return ERR_PTR(status);
37
38 /*
39 * Only get the access acl when explicitly requested: We don't
40 * need it for access decisions, and only some applications use
41 * it. Applications which request the access acl first are not
42 * penalized from this optimization.
43 */
44 if (type == ACL_TYPE_ACCESS)
45 args.mask |= NFS_ACLCNT|NFS_ACL;
46 if (S_ISDIR(inode->i_mode))
47 args.mask |= NFS_DFACLCNT|NFS_DFACL;
48 if (args.mask == 0)
49 return NULL;
50
51 dprintk("NFS call getacl\n");
52 msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_GETACL];
53 res.fattr = nfs_alloc_fattr();
54 if (res.fattr == NULL)
55 return ERR_PTR(-ENOMEM);
56
57 status = rpc_call_sync(server->client_acl, &msg, 0);
58 dprintk("NFS reply getacl: %d\n", status);
59
60 /* pages may have been allocated at the xdr layer. */
61 for (count = 0; count < NFSACL_MAXPAGES && args.pages[count]; count++)
62 __free_page(args.pages[count]);
63
64 switch (status) {
65 case 0:
66 status = nfs_refresh_inode(inode, res.fattr);
67 break;
68 case -EPFNOSUPPORT:
69 case -EPROTONOSUPPORT:
70 dprintk("NFS_V3_ACL extension not supported; disabling\n");
71 server->caps &= ~NFS_CAP_ACLS;
72 case -ENOTSUPP:
73 status = -EOPNOTSUPP;
74 default:
75 goto getout;
76 }
77 if ((args.mask & res.mask) != args.mask) {
78 status = -EIO;
79 goto getout;
80 }
81
82 if (res.acl_access != NULL) {
83 if ((posix_acl_equiv_mode(res.acl_access, NULL) == 0) ||
84 res.acl_access->a_count == 0) {
85 posix_acl_release(res.acl_access);
86 res.acl_access = NULL;
87 }
88 }
89
90 if (res.mask & NFS_ACL)
91 set_cached_acl(inode, ACL_TYPE_ACCESS, res.acl_access);
92 else
93 forget_cached_acl(inode, ACL_TYPE_ACCESS);
94
95 if (res.mask & NFS_DFACL)
96 set_cached_acl(inode, ACL_TYPE_DEFAULT, res.acl_default);
97 else
98 forget_cached_acl(inode, ACL_TYPE_DEFAULT);
99
100 nfs_free_fattr(res.fattr);
101 if (type == ACL_TYPE_ACCESS) {
102 posix_acl_release(res.acl_default);
103 return res.acl_access;
104 } else {
105 posix_acl_release(res.acl_access);
106 return res.acl_default;
107 }
108
109getout:
110 posix_acl_release(res.acl_access);
111 posix_acl_release(res.acl_default);
112 nfs_free_fattr(res.fattr);
113 return ERR_PTR(status);
114}
115
116static int __nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
117 struct posix_acl *dfacl)
118{
119 struct nfs_server *server = NFS_SERVER(inode);
120 struct nfs_fattr *fattr;
121 struct page *pages[NFSACL_MAXPAGES];
122 struct nfs3_setaclargs args = {
123 .inode = inode,
124 .mask = NFS_ACL,
125 .acl_access = acl,
126 .pages = pages,
127 };
128 struct rpc_message msg = {
129 .rpc_argp = &args,
130 .rpc_resp = &fattr,
131 };
132 int status;
133
134 status = -EOPNOTSUPP;
135 if (!nfs_server_capable(inode, NFS_CAP_ACLS))
136 goto out;
137
138 /* We are doing this here because XDR marshalling does not
139 * return any results, it BUGs. */
140 status = -ENOSPC;
141 if (acl != NULL && acl->a_count > NFS_ACL_MAX_ENTRIES)
142 goto out;
143 if (dfacl != NULL && dfacl->a_count > NFS_ACL_MAX_ENTRIES)
144 goto out;
145 if (S_ISDIR(inode->i_mode)) {
146 args.mask |= NFS_DFACL;
147 args.acl_default = dfacl;
148 args.len = nfsacl_size(acl, dfacl);
149 } else
150 args.len = nfsacl_size(acl, NULL);
151
152 if (args.len > NFS_ACL_INLINE_BUFSIZE) {
153 unsigned int npages = 1 + ((args.len - 1) >> PAGE_SHIFT);
154
155 status = -ENOMEM;
156 do {
157 args.pages[args.npages] = alloc_page(GFP_KERNEL);
158 if (args.pages[args.npages] == NULL)
159 goto out_freepages;
160 args.npages++;
161 } while (args.npages < npages);
162 }
163
164 dprintk("NFS call setacl\n");
165 status = -ENOMEM;
166 fattr = nfs_alloc_fattr();
167 if (fattr == NULL)
168 goto out_freepages;
169
170 msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_SETACL];
171 msg.rpc_resp = fattr;
172 status = rpc_call_sync(server->client_acl, &msg, 0);
173 nfs_access_zap_cache(inode);
174 nfs_zap_acl_cache(inode);
175 dprintk("NFS reply setacl: %d\n", status);
176
177 switch (status) {
178 case 0:
179 status = nfs_refresh_inode(inode, fattr);
180 set_cached_acl(inode, ACL_TYPE_ACCESS, acl);
181 set_cached_acl(inode, ACL_TYPE_DEFAULT, dfacl);
182 break;
183 case -EPFNOSUPPORT:
184 case -EPROTONOSUPPORT:
185 dprintk("NFS_V3_ACL SETACL RPC not supported"
186 "(will not retry)\n");
187 server->caps &= ~NFS_CAP_ACLS;
188 case -ENOTSUPP:
189 status = -EOPNOTSUPP;
190 }
191 nfs_free_fattr(fattr);
192out_freepages:
193 while (args.npages != 0) {
194 args.npages--;
195 __free_page(args.pages[args.npages]);
196 }
197out:
198 return status;
199}
200
201int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
202 struct posix_acl *dfacl)
203{
204 int ret;
205 ret = __nfs3_proc_setacls(inode, acl, dfacl);
206 return (ret == -EOPNOTSUPP) ? 0 : ret;
207
208}
209
210int nfs3_set_acl(struct inode *inode, struct posix_acl *acl, int type)
211{
212 struct posix_acl *alloc = NULL, *dfacl = NULL;
213 int status;
214
215 if (S_ISDIR(inode->i_mode)) {
216 switch(type) {
217 case ACL_TYPE_ACCESS:
218 alloc = dfacl = get_acl(inode, ACL_TYPE_DEFAULT);
219 if (IS_ERR(alloc))
220 goto fail;
221 break;
222
223 case ACL_TYPE_DEFAULT:
224 dfacl = acl;
225 alloc = acl = get_acl(inode, ACL_TYPE_ACCESS);
226 if (IS_ERR(alloc))
227 goto fail;
228 break;
229 }
230 }
231
232 if (acl == NULL) {
233 alloc = acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
234 if (IS_ERR(alloc))
235 goto fail;
236 }
237 status = __nfs3_proc_setacls(inode, acl, dfacl);
238 posix_acl_release(alloc);
239 return status;
240
241fail:
242 return PTR_ERR(alloc);
243}
244
245const struct xattr_handler *nfs3_xattr_handlers[] = {
246 &posix_acl_access_xattr_handler,
247 &posix_acl_default_xattr_handler,
248 NULL,
249};