Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Copyright (c) 2002 Red Hat, Inc. All rights reserved. | |
3 | * | |
4 | * This software may be freely redistributed under the terms of the | |
5 | * GNU General Public License. | |
6 | * | |
7 | * You should have received a copy of the GNU General Public License | |
8 | * along with this program; if not, write to the Free Software | |
9 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
10 | * | |
11 | * Authors: David Woodhouse <dwmw2@cambridge.redhat.com> | |
12 | * David Howells <dhowells@redhat.com> | |
13 | * | |
14 | */ | |
15 | ||
16 | #include <linux/kernel.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/init.h> | |
1da177e4 LT |
19 | #include <linux/slab.h> |
20 | #include <linux/fs.h> | |
21 | #include <linux/pagemap.h> | |
1da177e4 LT |
22 | #include "internal.h" |
23 | ||
24 | struct afs_iget_data { | |
25 | struct afs_fid fid; | |
26 | struct afs_volume *volume; /* volume on which resides */ | |
27 | }; | |
28 | ||
1da177e4 LT |
29 | /* |
30 | * map the AFS file status to the inode member variables | |
31 | */ | |
00d3b7a4 | 32 | static int afs_inode_map_status(struct afs_vnode *vnode, struct key *key) |
1da177e4 LT |
33 | { |
34 | struct inode *inode = AFS_VNODE_TO_I(vnode); | |
35 | ||
260a9803 | 36 | _debug("FS: ft=%d lk=%d sz=%llu ver=%Lu mod=%hu", |
1da177e4 LT |
37 | vnode->status.type, |
38 | vnode->status.nlink, | |
ba3e0e1a | 39 | (unsigned long long) vnode->status.size, |
08e0e7c8 | 40 | vnode->status.data_version, |
1da177e4 LT |
41 | vnode->status.mode); |
42 | ||
43 | switch (vnode->status.type) { | |
44 | case AFS_FTYPE_FILE: | |
45 | inode->i_mode = S_IFREG | vnode->status.mode; | |
46 | inode->i_op = &afs_file_inode_operations; | |
00d3b7a4 | 47 | inode->i_fop = &afs_file_operations; |
1da177e4 LT |
48 | break; |
49 | case AFS_FTYPE_DIR: | |
50 | inode->i_mode = S_IFDIR | vnode->status.mode; | |
51 | inode->i_op = &afs_dir_inode_operations; | |
52 | inode->i_fop = &afs_dir_file_operations; | |
53 | break; | |
54 | case AFS_FTYPE_SYMLINK: | |
55 | inode->i_mode = S_IFLNK | vnode->status.mode; | |
56 | inode->i_op = &page_symlink_inode_operations; | |
57 | break; | |
58 | default: | |
59 | printk("kAFS: AFS vnode with undefined type\n"); | |
60 | return -EBADMSG; | |
61 | } | |
62 | ||
63 | inode->i_nlink = vnode->status.nlink; | |
64 | inode->i_uid = vnode->status.owner; | |
65 | inode->i_gid = 0; | |
66 | inode->i_size = vnode->status.size; | |
67 | inode->i_ctime.tv_sec = vnode->status.mtime_server; | |
68 | inode->i_ctime.tv_nsec = 0; | |
69 | inode->i_atime = inode->i_mtime = inode->i_ctime; | |
1da177e4 LT |
70 | inode->i_blocks = 0; |
71 | inode->i_version = vnode->fid.unique; | |
72 | inode->i_mapping->a_ops = &afs_fs_aops; | |
73 | ||
74 | /* check to see whether a symbolic link is really a mountpoint */ | |
75 | if (vnode->status.type == AFS_FTYPE_SYMLINK) { | |
00d3b7a4 | 76 | afs_mntpt_check_symlink(vnode, key); |
1da177e4 | 77 | |
08e0e7c8 | 78 | if (test_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags)) { |
1da177e4 LT |
79 | inode->i_mode = S_IFDIR | vnode->status.mode; |
80 | inode->i_op = &afs_mntpt_inode_operations; | |
81 | inode->i_fop = &afs_mntpt_file_operations; | |
82 | } | |
83 | } | |
84 | ||
85 | return 0; | |
ec26815a | 86 | } |
1da177e4 | 87 | |
1da177e4 LT |
88 | /* |
89 | * iget5() comparator | |
90 | */ | |
91 | static int afs_iget5_test(struct inode *inode, void *opaque) | |
92 | { | |
93 | struct afs_iget_data *data = opaque; | |
94 | ||
95 | return inode->i_ino == data->fid.vnode && | |
96 | inode->i_version == data->fid.unique; | |
ec26815a | 97 | } |
1da177e4 | 98 | |
1da177e4 LT |
99 | /* |
100 | * iget5() inode initialiser | |
101 | */ | |
102 | static int afs_iget5_set(struct inode *inode, void *opaque) | |
103 | { | |
104 | struct afs_iget_data *data = opaque; | |
105 | struct afs_vnode *vnode = AFS_FS_I(inode); | |
106 | ||
107 | inode->i_ino = data->fid.vnode; | |
108 | inode->i_version = data->fid.unique; | |
109 | vnode->fid = data->fid; | |
110 | vnode->volume = data->volume; | |
111 | ||
112 | return 0; | |
ec26815a | 113 | } |
1da177e4 | 114 | |
1da177e4 LT |
115 | /* |
116 | * inode retrieval | |
117 | */ | |
260a9803 DH |
118 | struct inode *afs_iget(struct super_block *sb, struct key *key, |
119 | struct afs_fid *fid, struct afs_file_status *status, | |
120 | struct afs_callback *cb) | |
1da177e4 LT |
121 | { |
122 | struct afs_iget_data data = { .fid = *fid }; | |
123 | struct afs_super_info *as; | |
124 | struct afs_vnode *vnode; | |
125 | struct inode *inode; | |
126 | int ret; | |
127 | ||
128 | _enter(",{%u,%u,%u},,", fid->vid, fid->vnode, fid->unique); | |
129 | ||
130 | as = sb->s_fs_info; | |
131 | data.volume = as->volume; | |
132 | ||
133 | inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set, | |
134 | &data); | |
135 | if (!inode) { | |
136 | _leave(" = -ENOMEM"); | |
08e0e7c8 | 137 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
138 | } |
139 | ||
08e0e7c8 DH |
140 | _debug("GOT INODE %p { vl=%x vn=%x, u=%x }", |
141 | inode, fid->vid, fid->vnode, fid->unique); | |
142 | ||
1da177e4 LT |
143 | vnode = AFS_FS_I(inode); |
144 | ||
145 | /* deal with an existing inode */ | |
146 | if (!(inode->i_state & I_NEW)) { | |
08e0e7c8 DH |
147 | _leave(" = %p", inode); |
148 | return inode; | |
1da177e4 LT |
149 | } |
150 | ||
151 | #ifdef AFS_CACHING_SUPPORT | |
152 | /* set up caching before reading the status, as fetch-status reads the | |
153 | * first page of symlinks to see if they're really mntpts */ | |
154 | cachefs_acquire_cookie(vnode->volume->cache, | |
155 | NULL, | |
156 | vnode, | |
157 | &vnode->cache); | |
158 | #endif | |
159 | ||
260a9803 DH |
160 | if (!status) { |
161 | /* it's a remotely extant inode */ | |
162 | set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags); | |
163 | ret = afs_vnode_fetch_status(vnode, NULL, key); | |
164 | if (ret < 0) | |
165 | goto bad_inode; | |
166 | } else { | |
167 | /* it's an inode we just created */ | |
168 | memcpy(&vnode->status, status, sizeof(vnode->status)); | |
169 | ||
170 | if (!cb) { | |
171 | /* it's a symlink we just created (the fileserver | |
172 | * didn't give us a callback) */ | |
173 | vnode->cb_version = 0; | |
174 | vnode->cb_expiry = 0; | |
175 | vnode->cb_type = 0; | |
176 | vnode->cb_expires = get_seconds(); | |
177 | } else { | |
178 | vnode->cb_version = cb->version; | |
179 | vnode->cb_expiry = cb->expiry; | |
180 | vnode->cb_type = cb->type; | |
181 | vnode->cb_expires = vnode->cb_expiry + get_seconds(); | |
182 | } | |
183 | } | |
184 | ||
00d3b7a4 | 185 | ret = afs_inode_map_status(vnode, key); |
08e0e7c8 | 186 | if (ret < 0) |
1da177e4 LT |
187 | goto bad_inode; |
188 | ||
189 | /* success */ | |
260a9803 | 190 | clear_bit(AFS_VNODE_UNSET, &vnode->flags); |
08e0e7c8 | 191 | inode->i_flags |= S_NOATIME; |
1da177e4 | 192 | unlock_new_inode(inode); |
08e0e7c8 DH |
193 | _leave(" = %p [CB { v=%u t=%u }]", inode, vnode->cb_version, vnode->cb_type); |
194 | return inode; | |
1da177e4 LT |
195 | |
196 | /* failure */ | |
ec26815a | 197 | bad_inode: |
1da177e4 LT |
198 | make_bad_inode(inode); |
199 | unlock_new_inode(inode); | |
200 | iput(inode); | |
201 | ||
202 | _leave(" = %d [bad]", ret); | |
08e0e7c8 | 203 | return ERR_PTR(ret); |
ec26815a | 204 | } |
1da177e4 | 205 | |
260a9803 DH |
206 | /* |
207 | * validate a vnode/inode | |
208 | * - there are several things we need to check | |
209 | * - parent dir data changes (rm, rmdir, rename, mkdir, create, link, | |
210 | * symlink) | |
211 | * - parent dir metadata changed (security changes) | |
212 | * - dentry data changed (write, truncate) | |
213 | * - dentry metadata changed (security changes) | |
214 | */ | |
215 | int afs_validate(struct afs_vnode *vnode, struct key *key) | |
216 | { | |
217 | int ret; | |
218 | ||
219 | _enter("{v={%x:%u} fl=%lx},%x", | |
220 | vnode->fid.vid, vnode->fid.vnode, vnode->flags, | |
221 | key_serial(key)); | |
222 | ||
223 | if (vnode->cb_promised && | |
224 | !test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags) && | |
225 | !test_bit(AFS_VNODE_MODIFIED, &vnode->flags) && | |
226 | !test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) { | |
227 | if (vnode->cb_expires < get_seconds() + 10) { | |
228 | _debug("callback expired"); | |
229 | set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags); | |
230 | } else { | |
231 | goto valid; | |
232 | } | |
233 | } | |
234 | ||
235 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) | |
236 | goto valid; | |
237 | ||
238 | mutex_lock(&vnode->validate_lock); | |
239 | ||
240 | /* if the promise has expired, we need to check the server again to get | |
241 | * a new promise - note that if the (parent) directory's metadata was | |
242 | * changed then the security may be different and we may no longer have | |
243 | * access */ | |
244 | if (!vnode->cb_promised || | |
245 | test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) { | |
246 | _debug("not promised"); | |
247 | ret = afs_vnode_fetch_status(vnode, NULL, key); | |
248 | if (ret < 0) | |
249 | goto error_unlock; | |
250 | _debug("new promise [fl=%lx]", vnode->flags); | |
251 | } | |
252 | ||
253 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { | |
254 | _debug("file already deleted"); | |
255 | ret = -ESTALE; | |
256 | goto error_unlock; | |
257 | } | |
258 | ||
259 | /* if the vnode's data version number changed then its contents are | |
260 | * different */ | |
261 | if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) { | |
262 | _debug("zap data {%x:%d}", vnode->fid.vid, vnode->fid.vnode); | |
263 | invalidate_remote_inode(&vnode->vfs_inode); | |
264 | } | |
265 | ||
266 | clear_bit(AFS_VNODE_MODIFIED, &vnode->flags); | |
267 | mutex_unlock(&vnode->validate_lock); | |
268 | valid: | |
269 | _leave(" = 0"); | |
270 | return 0; | |
271 | ||
272 | error_unlock: | |
273 | mutex_unlock(&vnode->validate_lock); | |
274 | _leave(" = %d", ret); | |
275 | return ret; | |
276 | } | |
277 | ||
1da177e4 LT |
278 | /* |
279 | * read the attributes of an inode | |
280 | */ | |
281 | int afs_inode_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
282 | struct kstat *stat) | |
283 | { | |
1da177e4 | 284 | struct inode *inode; |
1da177e4 LT |
285 | |
286 | inode = dentry->d_inode; | |
287 | ||
288 | _enter("{ ino=%lu v=%lu }", inode->i_ino, inode->i_version); | |
289 | ||
1da177e4 | 290 | generic_fillattr(inode, stat); |
1da177e4 | 291 | return 0; |
ec26815a | 292 | } |
1da177e4 | 293 | |
1da177e4 LT |
294 | /* |
295 | * clear an AFS inode | |
296 | */ | |
297 | void afs_clear_inode(struct inode *inode) | |
298 | { | |
00d3b7a4 | 299 | struct afs_permits *permits; |
1da177e4 LT |
300 | struct afs_vnode *vnode; |
301 | ||
302 | vnode = AFS_FS_I(inode); | |
303 | ||
260a9803 DH |
304 | _enter("{%x:%d.%d} v=%u x=%u t=%u }", |
305 | vnode->fid.vid, | |
1da177e4 | 306 | vnode->fid.vnode, |
260a9803 | 307 | vnode->fid.unique, |
1da177e4 LT |
308 | vnode->cb_version, |
309 | vnode->cb_expiry, | |
08e0e7c8 | 310 | vnode->cb_type); |
1da177e4 | 311 | |
08e0e7c8 DH |
312 | _debug("CLEAR INODE %p", inode); |
313 | ||
314 | ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode); | |
315 | ||
316 | afs_give_up_callback(vnode); | |
317 | ||
318 | if (vnode->server) { | |
319 | spin_lock(&vnode->server->fs_lock); | |
320 | rb_erase(&vnode->server_rb, &vnode->server->fs_vnodes); | |
321 | spin_unlock(&vnode->server->fs_lock); | |
322 | afs_put_server(vnode->server); | |
323 | vnode->server = NULL; | |
324 | } | |
1da177e4 | 325 | |
08e0e7c8 | 326 | ASSERT(!vnode->cb_promised); |
1da177e4 LT |
327 | |
328 | #ifdef AFS_CACHING_SUPPORT | |
329 | cachefs_relinquish_cookie(vnode->cache, 0); | |
330 | vnode->cache = NULL; | |
331 | #endif | |
332 | ||
00d3b7a4 DH |
333 | mutex_lock(&vnode->permits_lock); |
334 | permits = vnode->permits; | |
335 | rcu_assign_pointer(vnode->permits, NULL); | |
336 | mutex_unlock(&vnode->permits_lock); | |
337 | if (permits) | |
338 | call_rcu(&permits->rcu, afs_zap_permits); | |
339 | ||
1da177e4 | 340 | _leave(""); |
ec26815a | 341 | } |