blob: 0747339011c31261a1cd1e473db702395773e69b [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 *
David Woodhouse44d1b982008-06-05 22:46:18 -070011 * Authors: David Woodhouse <dwmw2@infradead.org>
Linus Torvalds1da177e2005-04-16 15:20:36 -070012 * David Howells <dhowells@redhat.com>
13 *
14 */
15
16#include <linux/kernel.h>
17#include <linux/module.h>
18#include <linux/init.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/fs.h>
20#include <linux/pagemap.h>
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040021#include <linux/sched.h>
wangleibec5eb62010-08-11 09:38:04 +010022#include <linux/mount.h>
23#include <linux/namei.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include "internal.h"
25
26struct afs_iget_data {
27 struct afs_fid fid;
28 struct afs_volume *volume; /* volume on which resides */
29};
30
Linus Torvalds1da177e2005-04-16 15:20:36 -070031/*
32 * map the AFS file status to the inode member variables
33 */
David Howells00d3b7a2007-04-26 15:57:07 -070034static int afs_inode_map_status(struct afs_vnode *vnode, struct key *key)
Linus Torvalds1da177e2005-04-16 15:20:36 -070035{
36 struct inode *inode = AFS_VNODE_TO_I(vnode);
37
David Howells260a9802007-04-26 15:59:35 -070038 _debug("FS: ft=%d lk=%d sz=%llu ver=%Lu mod=%hu",
Linus Torvalds1da177e2005-04-16 15:20:36 -070039 vnode->status.type,
40 vnode->status.nlink,
David S. Millerba3e0e12007-04-26 16:06:22 -070041 (unsigned long long) vnode->status.size,
David Howells08e0e7c2007-04-26 15:55:03 -070042 vnode->status.data_version,
Linus Torvalds1da177e2005-04-16 15:20:36 -070043 vnode->status.mode);
44
45 switch (vnode->status.type) {
46 case AFS_FTYPE_FILE:
47 inode->i_mode = S_IFREG | vnode->status.mode;
48 inode->i_op = &afs_file_inode_operations;
David Howells00d3b7a2007-04-26 15:57:07 -070049 inode->i_fop = &afs_file_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 break;
51 case AFS_FTYPE_DIR:
52 inode->i_mode = S_IFDIR | vnode->status.mode;
53 inode->i_op = &afs_dir_inode_operations;
54 inode->i_fop = &afs_dir_file_operations;
55 break;
56 case AFS_FTYPE_SYMLINK:
57 inode->i_mode = S_IFLNK | vnode->status.mode;
58 inode->i_op = &page_symlink_inode_operations;
59 break;
60 default:
61 printk("kAFS: AFS vnode with undefined type\n");
62 return -EBADMSG;
63 }
64
David Howells9b3f26c2009-04-03 16:42:41 +010065#ifdef CONFIG_AFS_FSCACHE
66 if (vnode->status.size != inode->i_size)
67 fscache_attr_changed(vnode->cache);
68#endif
69
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 inode->i_nlink = vnode->status.nlink;
71 inode->i_uid = vnode->status.owner;
72 inode->i_gid = 0;
73 inode->i_size = vnode->status.size;
74 inode->i_ctime.tv_sec = vnode->status.mtime_server;
75 inode->i_ctime.tv_nsec = 0;
76 inode->i_atime = inode->i_mtime = inode->i_ctime;
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 inode->i_blocks = 0;
78 inode->i_version = vnode->fid.unique;
79 inode->i_mapping->a_ops = &afs_fs_aops;
80
81 /* check to see whether a symbolic link is really a mountpoint */
82 if (vnode->status.type == AFS_FTYPE_SYMLINK) {
David Howells00d3b7a2007-04-26 15:57:07 -070083 afs_mntpt_check_symlink(vnode, key);
Linus Torvalds1da177e2005-04-16 15:20:36 -070084
David Howells08e0e7c2007-04-26 15:55:03 -070085 if (test_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 inode->i_mode = S_IFDIR | vnode->status.mode;
87 inode->i_op = &afs_mntpt_inode_operations;
88 inode->i_fop = &afs_mntpt_file_operations;
89 }
90 }
91
92 return 0;
David Howellsec268152007-04-26 15:49:28 -070093}
Linus Torvalds1da177e2005-04-16 15:20:36 -070094
Linus Torvalds1da177e2005-04-16 15:20:36 -070095/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 * iget5() comparator
97 */
98static int afs_iget5_test(struct inode *inode, void *opaque)
99{
100 struct afs_iget_data *data = opaque;
101
102 return inode->i_ino == data->fid.vnode &&
103 inode->i_version == data->fid.unique;
David Howellsec268152007-04-26 15:49:28 -0700104}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106/*
wangleibec5eb62010-08-11 09:38:04 +0100107 * iget5() comparator for inode created by autocell operations
108 *
109 * These pseudo inodes don't match anything.
110 */
111static int afs_iget5_autocell_test(struct inode *inode, void *opaque)
112{
113 return 0;
114}
115
116/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 * iget5() inode initialiser
118 */
119static int afs_iget5_set(struct inode *inode, void *opaque)
120{
121 struct afs_iget_data *data = opaque;
122 struct afs_vnode *vnode = AFS_FS_I(inode);
123
124 inode->i_ino = data->fid.vnode;
125 inode->i_version = data->fid.unique;
126 vnode->fid = data->fid;
127 vnode->volume = data->volume;
128
129 return 0;
David Howellsec268152007-04-26 15:49:28 -0700130}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132/*
wangleibec5eb62010-08-11 09:38:04 +0100133 * inode retrieval for autocell
134 */
135struct inode *afs_iget_autocell(struct inode *dir, const char *dev_name,
136 int namesz, struct key *key)
137{
138 struct afs_iget_data data;
139 struct afs_super_info *as;
140 struct afs_vnode *vnode;
141 struct super_block *sb;
142 struct inode *inode;
143 static atomic_t afs_autocell_ino;
144
145 _enter("{%x:%u},%*.*s,",
146 AFS_FS_I(dir)->fid.vid, AFS_FS_I(dir)->fid.vnode,
147 namesz, namesz, dev_name ?: "");
148
149 sb = dir->i_sb;
150 as = sb->s_fs_info;
151 data.volume = as->volume;
152 data.fid.vid = as->volume->vid;
153 data.fid.unique = 0;
154 data.fid.vnode = 0;
155
156 inode = iget5_locked(sb, atomic_inc_return(&afs_autocell_ino),
157 afs_iget5_autocell_test, afs_iget5_set,
158 &data);
159 if (!inode) {
160 _leave(" = -ENOMEM");
161 return ERR_PTR(-ENOMEM);
162 }
163
164 _debug("GOT INODE %p { ino=%lu, vl=%x, vn=%x, u=%x }",
165 inode, inode->i_ino, data.fid.vid, data.fid.vnode,
166 data.fid.unique);
167
168 vnode = AFS_FS_I(inode);
169
170 /* there shouldn't be an existing inode */
171 BUG_ON(!(inode->i_state & I_NEW));
172
173 inode->i_size = 0;
174 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
175 inode->i_op = &afs_autocell_inode_operations;
176 inode->i_nlink = 2;
177 inode->i_uid = 0;
178 inode->i_gid = 0;
179 inode->i_ctime.tv_sec = get_seconds();
180 inode->i_ctime.tv_nsec = 0;
181 inode->i_atime = inode->i_mtime = inode->i_ctime;
182 inode->i_blocks = 0;
183 inode->i_version = 0;
184 inode->i_generation = 0;
185
186 set_bit(AFS_VNODE_PSEUDODIR, &vnode->flags);
187 inode->i_flags |= S_NOATIME;
188 unlock_new_inode(inode);
189 _leave(" = %p", inode);
190 return inode;
191}
192
193/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 * inode retrieval
195 */
David Howells260a9802007-04-26 15:59:35 -0700196struct inode *afs_iget(struct super_block *sb, struct key *key,
197 struct afs_fid *fid, struct afs_file_status *status,
198 struct afs_callback *cb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199{
200 struct afs_iget_data data = { .fid = *fid };
201 struct afs_super_info *as;
202 struct afs_vnode *vnode;
203 struct inode *inode;
204 int ret;
205
David Howells416351f2007-05-09 02:33:45 -0700206 _enter(",{%x:%u.%u},,", fid->vid, fid->vnode, fid->unique);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207
208 as = sb->s_fs_info;
209 data.volume = as->volume;
210
211 inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set,
212 &data);
213 if (!inode) {
214 _leave(" = -ENOMEM");
David Howells08e0e7c2007-04-26 15:55:03 -0700215 return ERR_PTR(-ENOMEM);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 }
217
David Howells08e0e7c2007-04-26 15:55:03 -0700218 _debug("GOT INODE %p { vl=%x vn=%x, u=%x }",
219 inode, fid->vid, fid->vnode, fid->unique);
220
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 vnode = AFS_FS_I(inode);
222
223 /* deal with an existing inode */
224 if (!(inode->i_state & I_NEW)) {
David Howells08e0e7c2007-04-26 15:55:03 -0700225 _leave(" = %p", inode);
226 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 }
228
David Howells260a9802007-04-26 15:59:35 -0700229 if (!status) {
230 /* it's a remotely extant inode */
231 set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
232 ret = afs_vnode_fetch_status(vnode, NULL, key);
233 if (ret < 0)
234 goto bad_inode;
235 } else {
236 /* it's an inode we just created */
237 memcpy(&vnode->status, status, sizeof(vnode->status));
238
239 if (!cb) {
240 /* it's a symlink we just created (the fileserver
241 * didn't give us a callback) */
242 vnode->cb_version = 0;
243 vnode->cb_expiry = 0;
244 vnode->cb_type = 0;
245 vnode->cb_expires = get_seconds();
246 } else {
247 vnode->cb_version = cb->version;
248 vnode->cb_expiry = cb->expiry;
249 vnode->cb_type = cb->type;
250 vnode->cb_expires = vnode->cb_expiry + get_seconds();
251 }
252 }
253
David Howells9b3f26c2009-04-03 16:42:41 +0100254 /* set up caching before mapping the status, as map-status reads the
255 * first page of symlinks to see if they're really mountpoints */
256 inode->i_size = vnode->status.size;
257#ifdef CONFIG_AFS_FSCACHE
258 vnode->cache = fscache_acquire_cookie(vnode->volume->cache,
259 &afs_vnode_cache_index_def,
260 vnode);
261#endif
262
David Howells00d3b7a2007-04-26 15:57:07 -0700263 ret = afs_inode_map_status(vnode, key);
David Howells08e0e7c2007-04-26 15:55:03 -0700264 if (ret < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 goto bad_inode;
266
267 /* success */
David Howells260a9802007-04-26 15:59:35 -0700268 clear_bit(AFS_VNODE_UNSET, &vnode->flags);
David Howells08e0e7c2007-04-26 15:55:03 -0700269 inode->i_flags |= S_NOATIME;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 unlock_new_inode(inode);
David Howells08e0e7c2007-04-26 15:55:03 -0700271 _leave(" = %p [CB { v=%u t=%u }]", inode, vnode->cb_version, vnode->cb_type);
272 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273
274 /* failure */
David Howellsec268152007-04-26 15:49:28 -0700275bad_inode:
David Howells9b3f26c2009-04-03 16:42:41 +0100276#ifdef CONFIG_AFS_FSCACHE
277 fscache_relinquish_cookie(vnode->cache, 0);
278 vnode->cache = NULL;
279#endif
David Howellsaa7fa242008-02-07 00:15:28 -0800280 iget_failed(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 _leave(" = %d [bad]", ret);
David Howells08e0e7c2007-04-26 15:55:03 -0700282 return ERR_PTR(ret);
David Howellsec268152007-04-26 15:49:28 -0700283}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285/*
David Howells416351f2007-05-09 02:33:45 -0700286 * mark the data attached to an inode as obsolete due to a write on the server
287 * - might also want to ditch all the outstanding writes and dirty pages
288 */
289void afs_zap_data(struct afs_vnode *vnode)
290{
David Howells0f300ca2007-05-10 22:22:20 -0700291 _enter("{%x:%u}", vnode->fid.vid, vnode->fid.vnode);
David Howells416351f2007-05-09 02:33:45 -0700292
293 /* nuke all the non-dirty pages that aren't locked, mapped or being
David Howells0f300ca2007-05-10 22:22:20 -0700294 * written back in a regular file and completely discard the pages in a
295 * directory or symlink */
296 if (S_ISREG(vnode->vfs_inode.i_mode))
297 invalidate_remote_inode(&vnode->vfs_inode);
298 else
299 invalidate_inode_pages2(vnode->vfs_inode.i_mapping);
David Howells416351f2007-05-09 02:33:45 -0700300}
301
302/*
David Howells260a9802007-04-26 15:59:35 -0700303 * validate a vnode/inode
304 * - there are several things we need to check
305 * - parent dir data changes (rm, rmdir, rename, mkdir, create, link,
306 * symlink)
307 * - parent dir metadata changed (security changes)
308 * - dentry data changed (write, truncate)
309 * - dentry metadata changed (security changes)
310 */
311int afs_validate(struct afs_vnode *vnode, struct key *key)
312{
313 int ret;
314
315 _enter("{v={%x:%u} fl=%lx},%x",
316 vnode->fid.vid, vnode->fid.vnode, vnode->flags,
317 key_serial(key));
318
319 if (vnode->cb_promised &&
320 !test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags) &&
321 !test_bit(AFS_VNODE_MODIFIED, &vnode->flags) &&
322 !test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) {
323 if (vnode->cb_expires < get_seconds() + 10) {
324 _debug("callback expired");
325 set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
326 } else {
327 goto valid;
328 }
329 }
330
331 if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
332 goto valid;
333
334 mutex_lock(&vnode->validate_lock);
335
336 /* if the promise has expired, we need to check the server again to get
337 * a new promise - note that if the (parent) directory's metadata was
338 * changed then the security may be different and we may no longer have
339 * access */
340 if (!vnode->cb_promised ||
341 test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) {
342 _debug("not promised");
343 ret = afs_vnode_fetch_status(vnode, NULL, key);
344 if (ret < 0)
345 goto error_unlock;
346 _debug("new promise [fl=%lx]", vnode->flags);
347 }
348
349 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
350 _debug("file already deleted");
351 ret = -ESTALE;
352 goto error_unlock;
353 }
354
355 /* if the vnode's data version number changed then its contents are
356 * different */
David Howells416351f2007-05-09 02:33:45 -0700357 if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags))
358 afs_zap_data(vnode);
David Howells260a9802007-04-26 15:59:35 -0700359
360 clear_bit(AFS_VNODE_MODIFIED, &vnode->flags);
361 mutex_unlock(&vnode->validate_lock);
362valid:
363 _leave(" = 0");
364 return 0;
365
366error_unlock:
367 mutex_unlock(&vnode->validate_lock);
368 _leave(" = %d", ret);
369 return ret;
370}
371
372/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 * read the attributes of an inode
374 */
David Howells416351f2007-05-09 02:33:45 -0700375int afs_getattr(struct vfsmount *mnt, struct dentry *dentry,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 struct kstat *stat)
377{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 struct inode *inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379
380 inode = dentry->d_inode;
381
Jean Noel Cordenner7a224222008-01-28 23:58:27 -0500382 _enter("{ ino=%lu v=%llu }", inode->i_ino,
383 (unsigned long long)inode->i_version);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 generic_fillattr(inode, stat);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386 return 0;
David Howellsec268152007-04-26 15:49:28 -0700387}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389/*
wangleibec5eb62010-08-11 09:38:04 +0100390 * discard an AFS inode
391 */
392int afs_drop_inode(struct inode *inode)
393{
394 _enter("");
395
396 if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags))
397 return generic_delete_inode(inode);
398 else
399 return generic_drop_inode(inode);
400}
401
402/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 * clear an AFS inode
404 */
Al Virob57922d2010-06-07 14:34:48 -0400405void afs_evict_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406{
David Howells00d3b7a2007-04-26 15:57:07 -0700407 struct afs_permits *permits;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 struct afs_vnode *vnode;
409
410 vnode = AFS_FS_I(inode);
411
David Howells416351f2007-05-09 02:33:45 -0700412 _enter("{%x:%u.%d} v=%u x=%u t=%u }",
David Howells260a9802007-04-26 15:59:35 -0700413 vnode->fid.vid,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 vnode->fid.vnode,
David Howells260a9802007-04-26 15:59:35 -0700415 vnode->fid.unique,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 vnode->cb_version,
417 vnode->cb_expiry,
David Howells08e0e7c2007-04-26 15:55:03 -0700418 vnode->cb_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419
David Howells08e0e7c2007-04-26 15:55:03 -0700420 _debug("CLEAR INODE %p", inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421
David Howells08e0e7c2007-04-26 15:55:03 -0700422 ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode);
423
Al Virob57922d2010-06-07 14:34:48 -0400424 truncate_inode_pages(&inode->i_data, 0);
425 end_writeback(inode);
426
David Howells08e0e7c2007-04-26 15:55:03 -0700427 afs_give_up_callback(vnode);
428
429 if (vnode->server) {
430 spin_lock(&vnode->server->fs_lock);
431 rb_erase(&vnode->server_rb, &vnode->server->fs_vnodes);
432 spin_unlock(&vnode->server->fs_lock);
433 afs_put_server(vnode->server);
434 vnode->server = NULL;
435 }
436
David Howells31143d52007-05-09 02:33:46 -0700437 ASSERT(list_empty(&vnode->writebacks));
David Howells08e0e7c2007-04-26 15:55:03 -0700438 ASSERT(!vnode->cb_promised);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439
David Howells9b3f26c2009-04-03 16:42:41 +0100440#ifdef CONFIG_AFS_FSCACHE
441 fscache_relinquish_cookie(vnode->cache, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 vnode->cache = NULL;
443#endif
444
David Howells00d3b7a2007-04-26 15:57:07 -0700445 mutex_lock(&vnode->permits_lock);
446 permits = vnode->permits;
447 rcu_assign_pointer(vnode->permits, NULL);
448 mutex_unlock(&vnode->permits_lock);
449 if (permits)
450 call_rcu(&permits->rcu, afs_zap_permits);
451
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 _leave("");
David Howellsec268152007-04-26 15:49:28 -0700453}
David Howells31143d52007-05-09 02:33:46 -0700454
455/*
456 * set the attributes of an inode
457 */
458int afs_setattr(struct dentry *dentry, struct iattr *attr)
459{
460 struct afs_vnode *vnode = AFS_FS_I(dentry->d_inode);
461 struct key *key;
462 int ret;
463
464 _enter("{%x:%u},{n=%s},%x",
465 vnode->fid.vid, vnode->fid.vnode, dentry->d_name.name,
466 attr->ia_valid);
467
468 if (!(attr->ia_valid & (ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID |
469 ATTR_MTIME))) {
470 _leave(" = 0 [unsupported]");
471 return 0;
472 }
473
474 /* flush any dirty data outstanding on a regular file */
475 if (S_ISREG(vnode->vfs_inode.i_mode)) {
476 filemap_write_and_wait(vnode->vfs_inode.i_mapping);
477 afs_writeback_all(vnode);
478 }
479
480 if (attr->ia_valid & ATTR_FILE) {
481 key = attr->ia_file->private_data;
482 } else {
483 key = afs_request_key(vnode->volume->cell);
484 if (IS_ERR(key)) {
485 ret = PTR_ERR(key);
486 goto error;
487 }
488 }
489
490 ret = afs_vnode_setattr(vnode, key, attr);
491 if (!(attr->ia_valid & ATTR_FILE))
492 key_put(key);
493
494error:
495 _leave(" = %d", ret);
496 return ret;
497}