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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 | ||
14 | struct 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 | ||
110 | getout: | |
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 | ||
117 | static 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); | |
196 | out_freepages: | |
197 | while (args.npages != 0) { | |
198 | args.npages--; | |
199 | __free_page(args.pages[args.npages]); | |
200 | } | |
201 | out: | |
202 | return status; | |
203 | } | |
204 | ||
205 | int 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 | ||
214 | int 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 | ||
245 | fail: | |
246 | return PTR_ERR(alloc); | |
247 | } | |
248 | ||
249 | const struct xattr_handler *nfs3_xattr_handlers[] = { | |
250 | &posix_acl_access_xattr_handler, | |
251 | &posix_acl_default_xattr_handler, | |
252 | NULL, | |
253 | }; | |
254 | ||
255 | static int | |
256 | nfs3_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 | ||
279 | ssize_t | |
280 | nfs3_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 | POSIX_ACL_XATTR_ACCESS, data, size, &result); | |
288 | if (error) | |
289 | return error; | |
290 | ||
291 | error = nfs3_list_one_acl(inode, ACL_TYPE_DEFAULT, | |
292 | POSIX_ACL_XATTR_DEFAULT, data, size, &result); | |
293 | if (error) | |
294 | return error; | |
295 | return result; | |
296 | } |