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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@infradead.org>
12 * David Howells <dhowells@redhat.com>
13 *
14 */
15
16#include <linux/kernel.h>
17#include <linux/module.h>
18#include <linux/init.h>
19#include <linux/fs.h>
20#include <linux/pagemap.h>
21#include <linux/sched.h>
22#include <linux/mount.h>
23#include <linux/namei.h>
24#include "internal.h"
25
26struct afs_iget_data {
27 struct afs_fid fid;
28 struct afs_volume *volume; /* volume on which resides */
29};
30
31/*
32 * map the AFS file status to the inode member variables
33 */
34static int afs_inode_map_status(struct afs_vnode *vnode, struct key *key)
35{
36 struct inode *inode = AFS_VNODE_TO_I(vnode);
37
38 _debug("FS: ft=%d lk=%d sz=%llu ver=%Lu mod=%hu",
39 vnode->status.type,
40 vnode->status.nlink,
41 (unsigned long long) vnode->status.size,
42 vnode->status.data_version,
43 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;
49 inode->i_fop = &afs_file_operations;
50 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
65#ifdef CONFIG_AFS_FSCACHE
66 if (vnode->status.size != inode->i_size)
67 fscache_attr_changed(vnode->cache);
68#endif
69
70 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;
77 inode->i_blocks = 0;
78 inode->i_generation = vnode->fid.unique;
79 inode->i_version = vnode->status.data_version;
80 inode->i_mapping->a_ops = &afs_fs_aops;
81
82 /* check to see whether a symbolic link is really a mountpoint */
83 if (vnode->status.type == AFS_FTYPE_SYMLINK) {
84 afs_mntpt_check_symlink(vnode, key);
85
86 if (test_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags)) {
87 inode->i_mode = S_IFDIR | vnode->status.mode;
88 inode->i_op = &afs_mntpt_inode_operations;
89 inode->i_fop = &afs_mntpt_file_operations;
90 }
91 }
92
93 return 0;
94}
95
96/*
97 * iget5() comparator
98 */
99static int afs_iget5_test(struct inode *inode, void *opaque)
100{
101 struct afs_iget_data *data = opaque;
102
103 return inode->i_ino == data->fid.vnode &&
104 inode->i_generation == data->fid.unique;
105}
106
107/*
108 * iget5() comparator for inode created by autocell operations
109 *
110 * These pseudo inodes don't match anything.
111 */
112static int afs_iget5_autocell_test(struct inode *inode, void *opaque)
113{
114 return 0;
115}
116
117/*
118 * iget5() inode initialiser
119 */
120static int afs_iget5_set(struct inode *inode, void *opaque)
121{
122 struct afs_iget_data *data = opaque;
123 struct afs_vnode *vnode = AFS_FS_I(inode);
124
125 inode->i_ino = data->fid.vnode;
126 inode->i_generation = data->fid.unique;
127 vnode->fid = data->fid;
128 vnode->volume = data->volume;
129
130 return 0;
131}
132
133/*
134 * inode retrieval for autocell
135 */
136struct inode *afs_iget_autocell(struct inode *dir, const char *dev_name,
137 int namesz, struct key *key)
138{
139 struct afs_iget_data data;
140 struct afs_super_info *as;
141 struct afs_vnode *vnode;
142 struct super_block *sb;
143 struct inode *inode;
144 static atomic_t afs_autocell_ino;
145
146 _enter("{%x:%u},%*.*s,",
147 AFS_FS_I(dir)->fid.vid, AFS_FS_I(dir)->fid.vnode,
148 namesz, namesz, dev_name ?: "");
149
150 sb = dir->i_sb;
151 as = sb->s_fs_info;
152 data.volume = as->volume;
153 data.fid.vid = as->volume->vid;
154 data.fid.unique = 0;
155 data.fid.vnode = 0;
156
157 inode = iget5_locked(sb, atomic_inc_return(&afs_autocell_ino),
158 afs_iget5_autocell_test, afs_iget5_set,
159 &data);
160 if (!inode) {
161 _leave(" = -ENOMEM");
162 return ERR_PTR(-ENOMEM);
163 }
164
165 _debug("GOT INODE %p { ino=%lu, vl=%x, vn=%x, u=%x }",
166 inode, inode->i_ino, data.fid.vid, data.fid.vnode,
167 data.fid.unique);
168
169 vnode = AFS_FS_I(inode);
170
171 /* there shouldn't be an existing inode */
172 BUG_ON(!(inode->i_state & I_NEW));
173
174 inode->i_size = 0;
175 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
176 inode->i_op = &afs_autocell_inode_operations;
177 inode->i_nlink = 2;
178 inode->i_uid = 0;
179 inode->i_gid = 0;
180 inode->i_ctime.tv_sec = get_seconds();
181 inode->i_ctime.tv_nsec = 0;
182 inode->i_atime = inode->i_mtime = inode->i_ctime;
183 inode->i_blocks = 0;
184 inode->i_version = 0;
185 inode->i_generation = 0;
186
187 set_bit(AFS_VNODE_PSEUDODIR, &vnode->flags);
188 set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
189 inode->i_flags |= S_AUTOMOUNT | S_NOATIME;
190 unlock_new_inode(inode);
191 _leave(" = %p", inode);
192 return inode;
193}
194
195/*
196 * inode retrieval
197 */
198struct inode *afs_iget(struct super_block *sb, struct key *key,
199 struct afs_fid *fid, struct afs_file_status *status,
200 struct afs_callback *cb)
201{
202 struct afs_iget_data data = { .fid = *fid };
203 struct afs_super_info *as;
204 struct afs_vnode *vnode;
205 struct inode *inode;
206 int ret;
207
208 _enter(",{%x:%u.%u},,", fid->vid, fid->vnode, fid->unique);
209
210 as = sb->s_fs_info;
211 data.volume = as->volume;
212
213 inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set,
214 &data);
215 if (!inode) {
216 _leave(" = -ENOMEM");
217 return ERR_PTR(-ENOMEM);
218 }
219
220 _debug("GOT INODE %p { vl=%x vn=%x, u=%x }",
221 inode, fid->vid, fid->vnode, fid->unique);
222
223 vnode = AFS_FS_I(inode);
224
225 /* deal with an existing inode */
226 if (!(inode->i_state & I_NEW)) {
227 _leave(" = %p", inode);
228 return inode;
229 }
230
231 if (!status) {
232 /* it's a remotely extant inode */
233 set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
234 ret = afs_vnode_fetch_status(vnode, NULL, key);
235 if (ret < 0)
236 goto bad_inode;
237 } else {
238 /* it's an inode we just created */
239 memcpy(&vnode->status, status, sizeof(vnode->status));
240
241 if (!cb) {
242 /* it's a symlink we just created (the fileserver
243 * didn't give us a callback) */
244 vnode->cb_version = 0;
245 vnode->cb_expiry = 0;
246 vnode->cb_type = 0;
247 vnode->cb_expires = get_seconds();
248 } else {
249 vnode->cb_version = cb->version;
250 vnode->cb_expiry = cb->expiry;
251 vnode->cb_type = cb->type;
252 vnode->cb_expires = vnode->cb_expiry + get_seconds();
253 }
254 }
255
256 /* set up caching before mapping the status, as map-status reads the
257 * first page of symlinks to see if they're really mountpoints */
258 inode->i_size = vnode->status.size;
259#ifdef CONFIG_AFS_FSCACHE
260 vnode->cache = fscache_acquire_cookie(vnode->volume->cache,
261 &afs_vnode_cache_index_def,
262 vnode);
263#endif
264
265 ret = afs_inode_map_status(vnode, key);
266 if (ret < 0)
267 goto bad_inode;
268
269 /* success */
270 clear_bit(AFS_VNODE_UNSET, &vnode->flags);
271 inode->i_flags |= S_NOATIME;
272 unlock_new_inode(inode);
273 _leave(" = %p [CB { v=%u t=%u }]", inode, vnode->cb_version, vnode->cb_type);
274 return inode;
275
276 /* failure */
277bad_inode:
278#ifdef CONFIG_AFS_FSCACHE
279 fscache_relinquish_cookie(vnode->cache, 0);
280 vnode->cache = NULL;
281#endif
282 iget_failed(inode);
283 _leave(" = %d [bad]", ret);
284 return ERR_PTR(ret);
285}
286
287/*
288 * mark the data attached to an inode as obsolete due to a write on the server
289 * - might also want to ditch all the outstanding writes and dirty pages
290 */
291void afs_zap_data(struct afs_vnode *vnode)
292{
293 _enter("{%x:%u}", vnode->fid.vid, vnode->fid.vnode);
294
295 /* nuke all the non-dirty pages that aren't locked, mapped or being
296 * written back in a regular file and completely discard the pages in a
297 * directory or symlink */
298 if (S_ISREG(vnode->vfs_inode.i_mode))
299 invalidate_remote_inode(&vnode->vfs_inode);
300 else
301 invalidate_inode_pages2(vnode->vfs_inode.i_mapping);
302}
303
304/*
305 * validate a vnode/inode
306 * - there are several things we need to check
307 * - parent dir data changes (rm, rmdir, rename, mkdir, create, link,
308 * symlink)
309 * - parent dir metadata changed (security changes)
310 * - dentry data changed (write, truncate)
311 * - dentry metadata changed (security changes)
312 */
313int afs_validate(struct afs_vnode *vnode, struct key *key)
314{
315 int ret;
316
317 _enter("{v={%x:%u} fl=%lx},%x",
318 vnode->fid.vid, vnode->fid.vnode, vnode->flags,
319 key_serial(key));
320
321 if (vnode->cb_promised &&
322 !test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags) &&
323 !test_bit(AFS_VNODE_MODIFIED, &vnode->flags) &&
324 !test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) {
325 if (vnode->cb_expires < get_seconds() + 10) {
326 _debug("callback expired");
327 set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
328 } else {
329 goto valid;
330 }
331 }
332
333 if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
334 goto valid;
335
336 mutex_lock(&vnode->validate_lock);
337
338 /* if the promise has expired, we need to check the server again to get
339 * a new promise - note that if the (parent) directory's metadata was
340 * changed then the security may be different and we may no longer have
341 * access */
342 if (!vnode->cb_promised ||
343 test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) {
344 _debug("not promised");
345 ret = afs_vnode_fetch_status(vnode, NULL, key);
346 if (ret < 0)
347 goto error_unlock;
348 _debug("new promise [fl=%lx]", vnode->flags);
349 }
350
351 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
352 _debug("file already deleted");
353 ret = -ESTALE;
354 goto error_unlock;
355 }
356
357 /* if the vnode's data version number changed then its contents are
358 * different */
359 if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags))
360 afs_zap_data(vnode);
361
362 clear_bit(AFS_VNODE_MODIFIED, &vnode->flags);
363 mutex_unlock(&vnode->validate_lock);
364valid:
365 _leave(" = 0");
366 return 0;
367
368error_unlock:
369 mutex_unlock(&vnode->validate_lock);
370 _leave(" = %d", ret);
371 return ret;
372}
373
374/*
375 * read the attributes of an inode
376 */
377int afs_getattr(struct vfsmount *mnt, struct dentry *dentry,
378 struct kstat *stat)
379{
380 struct inode *inode;
381
382 inode = dentry->d_inode;
383
384 _enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation);
385
386 generic_fillattr(inode, stat);
387 return 0;
388}
389
390/*
391 * discard an AFS inode
392 */
393int afs_drop_inode(struct inode *inode)
394{
395 _enter("");
396
397 if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags))
398 return generic_delete_inode(inode);
399 else
400 return generic_drop_inode(inode);
401}
402
403/*
404 * clear an AFS inode
405 */
406void afs_evict_inode(struct inode *inode)
407{
408 struct afs_permits *permits;
409 struct afs_vnode *vnode;
410
411 vnode = AFS_FS_I(inode);
412
413 _enter("{%x:%u.%d} v=%u x=%u t=%u }",
414 vnode->fid.vid,
415 vnode->fid.vnode,
416 vnode->fid.unique,
417 vnode->cb_version,
418 vnode->cb_expiry,
419 vnode->cb_type);
420
421 _debug("CLEAR INODE %p", inode);
422
423 ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode);
424
425 truncate_inode_pages(&inode->i_data, 0);
426 end_writeback(inode);
427
428 afs_give_up_callback(vnode);
429
430 if (vnode->server) {
431 spin_lock(&vnode->server->fs_lock);
432 rb_erase(&vnode->server_rb, &vnode->server->fs_vnodes);
433 spin_unlock(&vnode->server->fs_lock);
434 afs_put_server(vnode->server);
435 vnode->server = NULL;
436 }
437
438 ASSERT(list_empty(&vnode->writebacks));
439 ASSERT(!vnode->cb_promised);
440
441#ifdef CONFIG_AFS_FSCACHE
442 fscache_relinquish_cookie(vnode->cache, 0);
443 vnode->cache = NULL;
444#endif
445
446 mutex_lock(&vnode->permits_lock);
447 permits = vnode->permits;
448 rcu_assign_pointer(vnode->permits, NULL);
449 mutex_unlock(&vnode->permits_lock);
450 if (permits)
451 call_rcu(&permits->rcu, afs_zap_permits);
452
453 _leave("");
454}
455
456/*
457 * set the attributes of an inode
458 */
459int afs_setattr(struct dentry *dentry, struct iattr *attr)
460{
461 struct afs_vnode *vnode = AFS_FS_I(dentry->d_inode);
462 struct key *key;
463 int ret;
464
465 _enter("{%x:%u},{n=%s},%x",
466 vnode->fid.vid, vnode->fid.vnode, dentry->d_name.name,
467 attr->ia_valid);
468
469 if (!(attr->ia_valid & (ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID |
470 ATTR_MTIME))) {
471 _leave(" = 0 [unsupported]");
472 return 0;
473 }
474
475 /* flush any dirty data outstanding on a regular file */
476 if (S_ISREG(vnode->vfs_inode.i_mode)) {
477 filemap_write_and_wait(vnode->vfs_inode.i_mapping);
478 afs_writeback_all(vnode);
479 }
480
481 if (attr->ia_valid & ATTR_FILE) {
482 key = attr->ia_file->private_data;
483 } else {
484 key = afs_request_key(vnode->volume->cell);
485 if (IS_ERR(key)) {
486 ret = PTR_ERR(key);
487 goto error;
488 }
489 }
490
491 ret = afs_vnode_setattr(vnode, key, attr);
492 if (!(attr->ia_valid & ATTR_FILE))
493 key_put(key);
494
495error:
496 _leave(" = %d", ret);
497 return ret;
498}
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@infradead.org>
12 * David Howells <dhowells@redhat.com>
13 *
14 */
15
16#include <linux/kernel.h>
17#include <linux/module.h>
18#include <linux/init.h>
19#include <linux/fs.h>
20#include <linux/pagemap.h>
21#include <linux/sched.h>
22#include <linux/mount.h>
23#include <linux/namei.h>
24#include <linux/iversion.h>
25#include "internal.h"
26#include "afs_fs.h"
27
28static const struct inode_operations afs_symlink_inode_operations = {
29 .get_link = page_get_link,
30 .listxattr = afs_listxattr,
31};
32
33static noinline void dump_vnode(struct afs_vnode *vnode, struct afs_vnode *parent_vnode)
34{
35 static unsigned long once_only;
36
37 pr_warn("kAFS: AFS vnode with undefined type %u\n", vnode->status.type);
38 pr_warn("kAFS: A=%d m=%o s=%llx v=%llx\n",
39 vnode->status.abort_code,
40 vnode->status.mode,
41 vnode->status.size,
42 vnode->status.data_version);
43 pr_warn("kAFS: vnode %llx:%llx:%x\n",
44 vnode->fid.vid,
45 vnode->fid.vnode,
46 vnode->fid.unique);
47 if (parent_vnode)
48 pr_warn("kAFS: dir %llx:%llx:%x\n",
49 parent_vnode->fid.vid,
50 parent_vnode->fid.vnode,
51 parent_vnode->fid.unique);
52
53 if (!test_and_set_bit(0, &once_only))
54 dump_stack();
55}
56
57/*
58 * Set the file size and block count. Estimate the number of 512 bytes blocks
59 * used, rounded up to nearest 1K for consistency with other AFS clients.
60 */
61static void afs_set_i_size(struct afs_vnode *vnode, u64 size)
62{
63 i_size_write(&vnode->vfs_inode, size);
64 vnode->vfs_inode.i_blocks = ((size + 1023) >> 10) << 1;
65}
66
67/*
68 * Initialise an inode from the vnode status.
69 */
70static int afs_inode_init_from_status(struct afs_operation *op,
71 struct afs_vnode_param *vp,
72 struct afs_vnode *vnode)
73{
74 struct afs_file_status *status = &vp->scb.status;
75 struct inode *inode = AFS_VNODE_TO_I(vnode);
76 struct timespec64 t;
77
78 _enter("{%llx:%llu.%u} %s",
79 vp->fid.vid, vp->fid.vnode, vp->fid.unique,
80 op->type ? op->type->name : "???");
81
82 _debug("FS: ft=%d lk=%d sz=%llu ver=%Lu mod=%hu",
83 status->type,
84 status->nlink,
85 (unsigned long long) status->size,
86 status->data_version,
87 status->mode);
88
89 write_seqlock(&vnode->cb_lock);
90
91 vnode->cb_v_break = op->cb_v_break;
92 vnode->cb_s_break = op->cb_s_break;
93 vnode->status = *status;
94
95 t = status->mtime_client;
96 inode->i_ctime = t;
97 inode->i_mtime = t;
98 inode->i_atime = t;
99 inode->i_flags |= S_NOATIME;
100 inode->i_uid = make_kuid(&init_user_ns, status->owner);
101 inode->i_gid = make_kgid(&init_user_ns, status->group);
102 set_nlink(&vnode->vfs_inode, status->nlink);
103
104 switch (status->type) {
105 case AFS_FTYPE_FILE:
106 inode->i_mode = S_IFREG | status->mode;
107 inode->i_op = &afs_file_inode_operations;
108 inode->i_fop = &afs_file_operations;
109 inode->i_mapping->a_ops = &afs_fs_aops;
110 break;
111 case AFS_FTYPE_DIR:
112 inode->i_mode = S_IFDIR | status->mode;
113 inode->i_op = &afs_dir_inode_operations;
114 inode->i_fop = &afs_dir_file_operations;
115 inode->i_mapping->a_ops = &afs_dir_aops;
116 break;
117 case AFS_FTYPE_SYMLINK:
118 /* Symlinks with a mode of 0644 are actually mountpoints. */
119 if ((status->mode & 0777) == 0644) {
120 inode->i_flags |= S_AUTOMOUNT;
121
122 set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
123
124 inode->i_mode = S_IFDIR | 0555;
125 inode->i_op = &afs_mntpt_inode_operations;
126 inode->i_fop = &afs_mntpt_file_operations;
127 inode->i_mapping->a_ops = &afs_fs_aops;
128 } else {
129 inode->i_mode = S_IFLNK | status->mode;
130 inode->i_op = &afs_symlink_inode_operations;
131 inode->i_mapping->a_ops = &afs_fs_aops;
132 }
133 inode_nohighmem(inode);
134 break;
135 default:
136 dump_vnode(vnode, op->file[0].vnode != vnode ? op->file[0].vnode : NULL);
137 write_sequnlock(&vnode->cb_lock);
138 return afs_protocol_error(NULL, afs_eproto_file_type);
139 }
140
141 afs_set_i_size(vnode, status->size);
142
143 vnode->invalid_before = status->data_version;
144 inode_set_iversion_raw(&vnode->vfs_inode, status->data_version);
145
146 if (!vp->scb.have_cb) {
147 /* it's a symlink we just created (the fileserver
148 * didn't give us a callback) */
149 vnode->cb_expires_at = ktime_get_real_seconds();
150 } else {
151 vnode->cb_expires_at = vp->scb.callback.expires_at;
152 vnode->cb_server = op->server;
153 set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
154 }
155
156 write_sequnlock(&vnode->cb_lock);
157 return 0;
158}
159
160/*
161 * Update the core inode struct from a returned status record.
162 */
163static void afs_apply_status(struct afs_operation *op,
164 struct afs_vnode_param *vp)
165{
166 struct afs_file_status *status = &vp->scb.status;
167 struct afs_vnode *vnode = vp->vnode;
168 struct inode *inode = &vnode->vfs_inode;
169 struct timespec64 t;
170 umode_t mode;
171 bool data_changed = false;
172 bool change_size = vp->set_size;
173
174 _enter("{%llx:%llu.%u} %s",
175 vp->fid.vid, vp->fid.vnode, vp->fid.unique,
176 op->type ? op->type->name : "???");
177
178 BUG_ON(test_bit(AFS_VNODE_UNSET, &vnode->flags));
179
180 if (status->type != vnode->status.type) {
181 pr_warn("Vnode %llx:%llx:%x changed type %u to %u\n",
182 vnode->fid.vid,
183 vnode->fid.vnode,
184 vnode->fid.unique,
185 status->type, vnode->status.type);
186 afs_protocol_error(NULL, afs_eproto_bad_status);
187 return;
188 }
189
190 if (status->nlink != vnode->status.nlink)
191 set_nlink(inode, status->nlink);
192
193 if (status->owner != vnode->status.owner)
194 inode->i_uid = make_kuid(&init_user_ns, status->owner);
195
196 if (status->group != vnode->status.group)
197 inode->i_gid = make_kgid(&init_user_ns, status->group);
198
199 if (status->mode != vnode->status.mode) {
200 mode = inode->i_mode;
201 mode &= ~S_IALLUGO;
202 mode |= status->mode;
203 WRITE_ONCE(inode->i_mode, mode);
204 }
205
206 t = status->mtime_client;
207 inode->i_mtime = t;
208 if (vp->update_ctime)
209 inode->i_ctime = op->ctime;
210
211 if (vnode->status.data_version != status->data_version)
212 data_changed = true;
213
214 vnode->status = *status;
215
216 if (vp->dv_before + vp->dv_delta != status->data_version) {
217 if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags))
218 pr_warn("kAFS: vnode modified {%llx:%llu} %llx->%llx %s\n",
219 vnode->fid.vid, vnode->fid.vnode,
220 (unsigned long long)vp->dv_before + vp->dv_delta,
221 (unsigned long long)status->data_version,
222 op->type ? op->type->name : "???");
223
224 vnode->invalid_before = status->data_version;
225 if (vnode->status.type == AFS_FTYPE_DIR) {
226 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags))
227 afs_stat_v(vnode, n_inval);
228 } else {
229 set_bit(AFS_VNODE_ZAP_DATA, &vnode->flags);
230 }
231 change_size = true;
232 } else if (vnode->status.type == AFS_FTYPE_DIR) {
233 /* Expected directory change is handled elsewhere so
234 * that we can locally edit the directory and save on a
235 * download.
236 */
237 if (test_bit(AFS_VNODE_DIR_VALID, &vnode->flags))
238 data_changed = false;
239 change_size = true;
240 }
241
242 if (data_changed) {
243 inode_set_iversion_raw(inode, status->data_version);
244
245 /* Only update the size if the data version jumped. If the
246 * file is being modified locally, then we might have our own
247 * idea of what the size should be that's not the same as
248 * what's on the server.
249 */
250 if (change_size) {
251 afs_set_i_size(vnode, status->size);
252 inode->i_ctime = t;
253 inode->i_atime = t;
254 }
255 }
256}
257
258/*
259 * Apply a callback to a vnode.
260 */
261static void afs_apply_callback(struct afs_operation *op,
262 struct afs_vnode_param *vp)
263{
264 struct afs_callback *cb = &vp->scb.callback;
265 struct afs_vnode *vnode = vp->vnode;
266
267 if (!afs_cb_is_broken(vp->cb_break_before, vnode)) {
268 vnode->cb_expires_at = cb->expires_at;
269 vnode->cb_server = op->server;
270 set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
271 }
272}
273
274/*
275 * Apply the received status and callback to an inode all in the same critical
276 * section to avoid races with afs_validate().
277 */
278void afs_vnode_commit_status(struct afs_operation *op, struct afs_vnode_param *vp)
279{
280 struct afs_vnode *vnode = vp->vnode;
281
282 _enter("");
283
284 write_seqlock(&vnode->cb_lock);
285
286 if (vp->scb.have_error) {
287 /* A YFS server will return this from RemoveFile2 and AFS and
288 * YFS will return this from InlineBulkStatus.
289 */
290 if (vp->scb.status.abort_code == VNOVNODE) {
291 set_bit(AFS_VNODE_DELETED, &vnode->flags);
292 clear_nlink(&vnode->vfs_inode);
293 __afs_break_callback(vnode, afs_cb_break_for_deleted);
294 op->flags &= ~AFS_OPERATION_DIR_CONFLICT;
295 }
296 } else if (vp->scb.have_status) {
297 afs_apply_status(op, vp);
298 if (vp->scb.have_cb)
299 afs_apply_callback(op, vp);
300 } else if (vp->op_unlinked && !(op->flags & AFS_OPERATION_DIR_CONFLICT)) {
301 drop_nlink(&vnode->vfs_inode);
302 if (vnode->vfs_inode.i_nlink == 0) {
303 set_bit(AFS_VNODE_DELETED, &vnode->flags);
304 __afs_break_callback(vnode, afs_cb_break_for_deleted);
305 }
306 }
307
308 write_sequnlock(&vnode->cb_lock);
309
310 if (vp->scb.have_status)
311 afs_cache_permit(vnode, op->key, vp->cb_break_before, &vp->scb);
312}
313
314static void afs_fetch_status_success(struct afs_operation *op)
315{
316 struct afs_vnode_param *vp = &op->file[op->fetch_status.which];
317 struct afs_vnode *vnode = vp->vnode;
318 int ret;
319
320 if (vnode->vfs_inode.i_state & I_NEW) {
321 ret = afs_inode_init_from_status(op, vp, vnode);
322 op->error = ret;
323 if (ret == 0)
324 afs_cache_permit(vnode, op->key, vp->cb_break_before, &vp->scb);
325 } else {
326 afs_vnode_commit_status(op, vp);
327 }
328}
329
330const struct afs_operation_ops afs_fetch_status_operation = {
331 .issue_afs_rpc = afs_fs_fetch_status,
332 .issue_yfs_rpc = yfs_fs_fetch_status,
333 .success = afs_fetch_status_success,
334 .aborted = afs_check_for_remote_deletion,
335};
336
337/*
338 * Fetch file status from the volume.
339 */
340int afs_fetch_status(struct afs_vnode *vnode, struct key *key, bool is_new,
341 afs_access_t *_caller_access)
342{
343 struct afs_operation *op;
344
345 _enter("%s,{%llx:%llu.%u,S=%lx}",
346 vnode->volume->name,
347 vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique,
348 vnode->flags);
349
350 op = afs_alloc_operation(key, vnode->volume);
351 if (IS_ERR(op))
352 return PTR_ERR(op);
353
354 afs_op_set_vnode(op, 0, vnode);
355
356 op->nr_files = 1;
357 op->ops = &afs_fetch_status_operation;
358 afs_begin_vnode_operation(op);
359 afs_wait_for_operation(op);
360
361 if (_caller_access)
362 *_caller_access = op->file[0].scb.status.caller_access;
363 return afs_put_operation(op);
364}
365
366/*
367 * ilookup() comparator
368 */
369int afs_ilookup5_test_by_fid(struct inode *inode, void *opaque)
370{
371 struct afs_vnode *vnode = AFS_FS_I(inode);
372 struct afs_fid *fid = opaque;
373
374 return (fid->vnode == vnode->fid.vnode &&
375 fid->vnode_hi == vnode->fid.vnode_hi &&
376 fid->unique == vnode->fid.unique);
377}
378
379/*
380 * iget5() comparator
381 */
382static int afs_iget5_test(struct inode *inode, void *opaque)
383{
384 struct afs_vnode_param *vp = opaque;
385 //struct afs_vnode *vnode = AFS_FS_I(inode);
386
387 return afs_ilookup5_test_by_fid(inode, &vp->fid);
388}
389
390/*
391 * iget5() inode initialiser
392 */
393static int afs_iget5_set(struct inode *inode, void *opaque)
394{
395 struct afs_vnode_param *vp = opaque;
396 struct afs_super_info *as = AFS_FS_S(inode->i_sb);
397 struct afs_vnode *vnode = AFS_FS_I(inode);
398
399 vnode->volume = as->volume;
400 vnode->fid = vp->fid;
401
402 /* YFS supports 96-bit vnode IDs, but Linux only supports
403 * 64-bit inode numbers.
404 */
405 inode->i_ino = vnode->fid.vnode;
406 inode->i_generation = vnode->fid.unique;
407 return 0;
408}
409
410/*
411 * Get a cache cookie for an inode.
412 */
413static void afs_get_inode_cache(struct afs_vnode *vnode)
414{
415#ifdef CONFIG_AFS_FSCACHE
416 struct {
417 u32 vnode_id;
418 u32 unique;
419 u32 vnode_id_ext[2]; /* Allow for a 96-bit key */
420 } __packed key;
421 struct afs_vnode_cache_aux aux;
422
423 if (vnode->status.type == AFS_FTYPE_DIR) {
424 vnode->cache = NULL;
425 return;
426 }
427
428 key.vnode_id = vnode->fid.vnode;
429 key.unique = vnode->fid.unique;
430 key.vnode_id_ext[0] = vnode->fid.vnode >> 32;
431 key.vnode_id_ext[1] = vnode->fid.vnode_hi;
432 aux.data_version = vnode->status.data_version;
433
434 vnode->cache = fscache_acquire_cookie(vnode->volume->cache,
435 &afs_vnode_cache_index_def,
436 &key, sizeof(key),
437 &aux, sizeof(aux),
438 vnode, vnode->status.size, true);
439#endif
440}
441
442/*
443 * inode retrieval
444 */
445struct inode *afs_iget(struct afs_operation *op, struct afs_vnode_param *vp)
446{
447 struct afs_vnode_param *dvp = &op->file[0];
448 struct super_block *sb = dvp->vnode->vfs_inode.i_sb;
449 struct afs_vnode *vnode;
450 struct inode *inode;
451 int ret;
452
453 _enter(",{%llx:%llu.%u},,", vp->fid.vid, vp->fid.vnode, vp->fid.unique);
454
455 inode = iget5_locked(sb, vp->fid.vnode, afs_iget5_test, afs_iget5_set, vp);
456 if (!inode) {
457 _leave(" = -ENOMEM");
458 return ERR_PTR(-ENOMEM);
459 }
460
461 vnode = AFS_FS_I(inode);
462
463 _debug("GOT INODE %p { vl=%llx vn=%llx, u=%x }",
464 inode, vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique);
465
466 /* deal with an existing inode */
467 if (!(inode->i_state & I_NEW)) {
468 _leave(" = %p", inode);
469 return inode;
470 }
471
472 ret = afs_inode_init_from_status(op, vp, vnode);
473 if (ret < 0)
474 goto bad_inode;
475
476 afs_get_inode_cache(vnode);
477
478 /* success */
479 clear_bit(AFS_VNODE_UNSET, &vnode->flags);
480 unlock_new_inode(inode);
481 _leave(" = %p", inode);
482 return inode;
483
484 /* failure */
485bad_inode:
486 iget_failed(inode);
487 _leave(" = %d [bad]", ret);
488 return ERR_PTR(ret);
489}
490
491static int afs_iget5_set_root(struct inode *inode, void *opaque)
492{
493 struct afs_super_info *as = AFS_FS_S(inode->i_sb);
494 struct afs_vnode *vnode = AFS_FS_I(inode);
495
496 vnode->volume = as->volume;
497 vnode->fid.vid = as->volume->vid,
498 vnode->fid.vnode = 1;
499 vnode->fid.unique = 1;
500 inode->i_ino = 1;
501 inode->i_generation = 1;
502 return 0;
503}
504
505/*
506 * Set up the root inode for a volume. This is always vnode 1, unique 1 within
507 * the volume.
508 */
509struct inode *afs_root_iget(struct super_block *sb, struct key *key)
510{
511 struct afs_super_info *as = AFS_FS_S(sb);
512 struct afs_operation *op;
513 struct afs_vnode *vnode;
514 struct inode *inode;
515 int ret;
516
517 _enter(",{%llx},,", as->volume->vid);
518
519 inode = iget5_locked(sb, 1, NULL, afs_iget5_set_root, NULL);
520 if (!inode) {
521 _leave(" = -ENOMEM");
522 return ERR_PTR(-ENOMEM);
523 }
524
525 _debug("GOT ROOT INODE %p { vl=%llx }", inode, as->volume->vid);
526
527 BUG_ON(!(inode->i_state & I_NEW));
528
529 vnode = AFS_FS_I(inode);
530 vnode->cb_v_break = as->volume->cb_v_break,
531
532 op = afs_alloc_operation(key, as->volume);
533 if (IS_ERR(op)) {
534 ret = PTR_ERR(op);
535 goto error;
536 }
537
538 afs_op_set_vnode(op, 0, vnode);
539
540 op->nr_files = 1;
541 op->ops = &afs_fetch_status_operation;
542 ret = afs_do_sync_operation(op);
543 if (ret < 0)
544 goto error;
545
546 afs_get_inode_cache(vnode);
547
548 clear_bit(AFS_VNODE_UNSET, &vnode->flags);
549 unlock_new_inode(inode);
550 _leave(" = %p", inode);
551 return inode;
552
553error:
554 iget_failed(inode);
555 _leave(" = %d [bad]", ret);
556 return ERR_PTR(ret);
557}
558
559/*
560 * mark the data attached to an inode as obsolete due to a write on the server
561 * - might also want to ditch all the outstanding writes and dirty pages
562 */
563static void afs_zap_data(struct afs_vnode *vnode)
564{
565 _enter("{%llx:%llu}", vnode->fid.vid, vnode->fid.vnode);
566
567#ifdef CONFIG_AFS_FSCACHE
568 fscache_invalidate(vnode->cache);
569#endif
570
571 /* nuke all the non-dirty pages that aren't locked, mapped or being
572 * written back in a regular file and completely discard the pages in a
573 * directory or symlink */
574 if (S_ISREG(vnode->vfs_inode.i_mode))
575 invalidate_remote_inode(&vnode->vfs_inode);
576 else
577 invalidate_inode_pages2(vnode->vfs_inode.i_mapping);
578}
579
580/*
581 * Get the server reinit counter for a vnode's current server.
582 */
583static bool afs_get_s_break_rcu(struct afs_vnode *vnode, unsigned int *_s_break)
584{
585 struct afs_server_list *slist = rcu_dereference(vnode->volume->servers);
586 struct afs_server *server;
587 int i;
588
589 for (i = 0; i < slist->nr_servers; i++) {
590 server = slist->servers[i].server;
591 if (server == vnode->cb_server) {
592 *_s_break = READ_ONCE(server->cb_s_break);
593 return true;
594 }
595 }
596
597 return false;
598}
599
600/*
601 * Check the validity of a vnode/inode.
602 */
603bool afs_check_validity(struct afs_vnode *vnode)
604{
605 struct afs_volume *volume = vnode->volume;
606 enum afs_cb_break_reason need_clear = afs_cb_break_no_break;
607 time64_t now = ktime_get_real_seconds();
608 bool valid;
609 unsigned int cb_break, cb_s_break, cb_v_break;
610 int seq = 0;
611
612 do {
613 read_seqbegin_or_lock(&vnode->cb_lock, &seq);
614 cb_v_break = READ_ONCE(volume->cb_v_break);
615 cb_break = vnode->cb_break;
616
617 if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags) &&
618 afs_get_s_break_rcu(vnode, &cb_s_break)) {
619 if (vnode->cb_s_break != cb_s_break ||
620 vnode->cb_v_break != cb_v_break) {
621 vnode->cb_s_break = cb_s_break;
622 vnode->cb_v_break = cb_v_break;
623 need_clear = afs_cb_break_for_vsbreak;
624 valid = false;
625 } else if (test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) {
626 need_clear = afs_cb_break_for_zap;
627 valid = false;
628 } else if (vnode->cb_expires_at - 10 <= now) {
629 need_clear = afs_cb_break_for_lapsed;
630 valid = false;
631 } else {
632 valid = true;
633 }
634 } else if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
635 valid = true;
636 } else {
637 vnode->cb_v_break = cb_v_break;
638 valid = false;
639 }
640
641 } while (need_seqretry(&vnode->cb_lock, seq));
642
643 done_seqretry(&vnode->cb_lock, seq);
644
645 if (need_clear != afs_cb_break_no_break) {
646 write_seqlock(&vnode->cb_lock);
647 if (cb_break == vnode->cb_break)
648 __afs_break_callback(vnode, need_clear);
649 else
650 trace_afs_cb_miss(&vnode->fid, need_clear);
651 write_sequnlock(&vnode->cb_lock);
652 valid = false;
653 }
654
655 return valid;
656}
657
658/*
659 * validate a vnode/inode
660 * - there are several things we need to check
661 * - parent dir data changes (rm, rmdir, rename, mkdir, create, link,
662 * symlink)
663 * - parent dir metadata changed (security changes)
664 * - dentry data changed (write, truncate)
665 * - dentry metadata changed (security changes)
666 */
667int afs_validate(struct afs_vnode *vnode, struct key *key)
668{
669 bool valid;
670 int ret;
671
672 _enter("{v={%llx:%llu} fl=%lx},%x",
673 vnode->fid.vid, vnode->fid.vnode, vnode->flags,
674 key_serial(key));
675
676 rcu_read_lock();
677 valid = afs_check_validity(vnode);
678 rcu_read_unlock();
679
680 if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
681 clear_nlink(&vnode->vfs_inode);
682
683 if (valid)
684 goto valid;
685
686 down_write(&vnode->validate_lock);
687
688 /* if the promise has expired, we need to check the server again to get
689 * a new promise - note that if the (parent) directory's metadata was
690 * changed then the security may be different and we may no longer have
691 * access */
692 if (!test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
693 _debug("not promised");
694 ret = afs_fetch_status(vnode, key, false, NULL);
695 if (ret < 0) {
696 if (ret == -ENOENT) {
697 set_bit(AFS_VNODE_DELETED, &vnode->flags);
698 ret = -ESTALE;
699 }
700 goto error_unlock;
701 }
702 _debug("new promise [fl=%lx]", vnode->flags);
703 }
704
705 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
706 _debug("file already deleted");
707 ret = -ESTALE;
708 goto error_unlock;
709 }
710
711 /* if the vnode's data version number changed then its contents are
712 * different */
713 if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags))
714 afs_zap_data(vnode);
715 up_write(&vnode->validate_lock);
716valid:
717 _leave(" = 0");
718 return 0;
719
720error_unlock:
721 up_write(&vnode->validate_lock);
722 _leave(" = %d", ret);
723 return ret;
724}
725
726/*
727 * read the attributes of an inode
728 */
729int afs_getattr(const struct path *path, struct kstat *stat,
730 u32 request_mask, unsigned int query_flags)
731{
732 struct inode *inode = d_inode(path->dentry);
733 struct afs_vnode *vnode = AFS_FS_I(inode);
734 int seq = 0;
735
736 _enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation);
737
738 do {
739 read_seqbegin_or_lock(&vnode->cb_lock, &seq);
740 generic_fillattr(inode, stat);
741 if (test_bit(AFS_VNODE_SILLY_DELETED, &vnode->flags) &&
742 stat->nlink > 0)
743 stat->nlink -= 1;
744 } while (need_seqretry(&vnode->cb_lock, seq));
745
746 done_seqretry(&vnode->cb_lock, seq);
747 return 0;
748}
749
750/*
751 * discard an AFS inode
752 */
753int afs_drop_inode(struct inode *inode)
754{
755 _enter("");
756
757 if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags))
758 return generic_delete_inode(inode);
759 else
760 return generic_drop_inode(inode);
761}
762
763/*
764 * clear an AFS inode
765 */
766void afs_evict_inode(struct inode *inode)
767{
768 struct afs_vnode *vnode;
769
770 vnode = AFS_FS_I(inode);
771
772 _enter("{%llx:%llu.%d}",
773 vnode->fid.vid,
774 vnode->fid.vnode,
775 vnode->fid.unique);
776
777 _debug("CLEAR INODE %p", inode);
778
779 ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode);
780
781 truncate_inode_pages_final(&inode->i_data);
782 clear_inode(inode);
783
784 while (!list_empty(&vnode->wb_keys)) {
785 struct afs_wb_key *wbk = list_entry(vnode->wb_keys.next,
786 struct afs_wb_key, vnode_link);
787 list_del(&wbk->vnode_link);
788 afs_put_wb_key(wbk);
789 }
790
791#ifdef CONFIG_AFS_FSCACHE
792 {
793 struct afs_vnode_cache_aux aux;
794
795 aux.data_version = vnode->status.data_version;
796 fscache_relinquish_cookie(vnode->cache, &aux,
797 test_bit(AFS_VNODE_DELETED, &vnode->flags));
798 vnode->cache = NULL;
799 }
800#endif
801
802 afs_prune_wb_keys(vnode);
803 afs_put_permits(rcu_access_pointer(vnode->permit_cache));
804 key_put(vnode->silly_key);
805 vnode->silly_key = NULL;
806 key_put(vnode->lock_key);
807 vnode->lock_key = NULL;
808 _leave("");
809}
810
811static void afs_setattr_success(struct afs_operation *op)
812{
813 struct afs_vnode_param *vp = &op->file[0];
814 struct inode *inode = &vp->vnode->vfs_inode;
815 loff_t old_i_size = i_size_read(inode);
816
817 op->setattr.old_i_size = old_i_size;
818 afs_vnode_commit_status(op, vp);
819 /* inode->i_size has now been changed. */
820
821 if (op->setattr.attr->ia_valid & ATTR_SIZE) {
822 loff_t size = op->setattr.attr->ia_size;
823 if (size > old_i_size)
824 pagecache_isize_extended(inode, old_i_size, size);
825 }
826}
827
828static void afs_setattr_edit_file(struct afs_operation *op)
829{
830 struct afs_vnode_param *vp = &op->file[0];
831 struct inode *inode = &vp->vnode->vfs_inode;
832
833 if (op->setattr.attr->ia_valid & ATTR_SIZE) {
834 loff_t size = op->setattr.attr->ia_size;
835 loff_t i_size = op->setattr.old_i_size;
836
837 if (size < i_size)
838 truncate_pagecache(inode, size);
839 }
840}
841
842static const struct afs_operation_ops afs_setattr_operation = {
843 .issue_afs_rpc = afs_fs_setattr,
844 .issue_yfs_rpc = yfs_fs_setattr,
845 .success = afs_setattr_success,
846 .edit_dir = afs_setattr_edit_file,
847};
848
849/*
850 * set the attributes of an inode
851 */
852int afs_setattr(struct dentry *dentry, struct iattr *attr)
853{
854 struct afs_operation *op;
855 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
856 int ret;
857
858 _enter("{%llx:%llu},{n=%pd},%x",
859 vnode->fid.vid, vnode->fid.vnode, dentry,
860 attr->ia_valid);
861
862 if (!(attr->ia_valid & (ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID |
863 ATTR_MTIME | ATTR_MTIME_SET | ATTR_TIMES_SET |
864 ATTR_TOUCH))) {
865 _leave(" = 0 [unsupported]");
866 return 0;
867 }
868
869 if (attr->ia_valid & ATTR_SIZE) {
870 if (!S_ISREG(vnode->vfs_inode.i_mode))
871 return -EISDIR;
872
873 ret = inode_newsize_ok(&vnode->vfs_inode, attr->ia_size);
874 if (ret)
875 return ret;
876
877 if (attr->ia_size == i_size_read(&vnode->vfs_inode))
878 attr->ia_valid &= ~ATTR_SIZE;
879 }
880
881 /* flush any dirty data outstanding on a regular file */
882 if (S_ISREG(vnode->vfs_inode.i_mode))
883 filemap_write_and_wait(vnode->vfs_inode.i_mapping);
884
885 /* Prevent any new writebacks from starting whilst we do this. */
886 down_write(&vnode->validate_lock);
887
888 op = afs_alloc_operation(((attr->ia_valid & ATTR_FILE) ?
889 afs_file_key(attr->ia_file) : NULL),
890 vnode->volume);
891 if (IS_ERR(op)) {
892 ret = PTR_ERR(op);
893 goto out_unlock;
894 }
895
896 afs_op_set_vnode(op, 0, vnode);
897 op->setattr.attr = attr;
898
899 if (attr->ia_valid & ATTR_SIZE) {
900 op->file[0].dv_delta = 1;
901 op->file[0].set_size = true;
902 }
903 op->ctime = attr->ia_ctime;
904 op->file[0].update_ctime = 1;
905
906 op->ops = &afs_setattr_operation;
907 ret = afs_do_sync_operation(op);
908
909out_unlock:
910 up_write(&vnode->validate_lock);
911 _leave(" = %d", ret);
912 return ret;
913}