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 | * | |
44d1b980 | 11 | * Authors: David Woodhouse <dwmw2@infradead.org> |
1da177e4 LT |
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/fs.h> |
20 | #include <linux/pagemap.h> | |
e8edc6e0 | 21 | #include <linux/sched.h> |
bec5eb61 | 22 | #include <linux/mount.h> |
23 | #include <linux/namei.h> | |
a01179e6 | 24 | #include <linux/iversion.h> |
1da177e4 | 25 | #include "internal.h" |
a38a7558 | 26 | #include "afs_fs.h" |
1da177e4 | 27 | |
d3e3b7ea DH |
28 | static const struct inode_operations afs_symlink_inode_operations = { |
29 | .get_link = page_get_link, | |
30 | .listxattr = afs_listxattr, | |
31 | }; | |
32 | ||
b134d687 DH |
33 | static noinline void dump_vnode(struct afs_vnode *vnode, struct afs_vnode *parent_vnode) |
34 | { | |
35 | static unsigned long once_only; | |
36 | ||
a4e530ae | 37 | pr_warn("kAFS: AFS vnode with undefined type %u\n", vnode->status.type); |
b134d687 DH |
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 | ||
2cd42d19 DH |
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 | */ | |
61 | static 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 | ||
1da177e4 | 67 | /* |
dd9fbcb8 | 68 | * Initialise an inode from the vnode status. |
1da177e4 | 69 | */ |
b134d687 | 70 | static int afs_inode_init_from_status(struct afs_vnode *vnode, struct key *key, |
a58823ac DH |
71 | struct afs_cb_interest *cbi, |
72 | struct afs_vnode *parent_vnode, | |
73 | struct afs_status_cb *scb) | |
1da177e4 | 74 | { |
a58823ac DH |
75 | struct afs_cb_interest *old_cbi = NULL; |
76 | struct afs_file_status *status = &scb->status; | |
1da177e4 | 77 | struct inode *inode = AFS_VNODE_TO_I(vnode); |
a58823ac | 78 | struct timespec64 t; |
1da177e4 | 79 | |
260a9803 | 80 | _debug("FS: ft=%d lk=%d sz=%llu ver=%Lu mod=%hu", |
a58823ac DH |
81 | status->type, |
82 | status->nlink, | |
83 | (unsigned long long) status->size, | |
84 | status->data_version, | |
85 | status->mode); | |
1da177e4 | 86 | |
a58823ac DH |
87 | write_seqlock(&vnode->cb_lock); |
88 | ||
89 | vnode->status = *status; | |
c435ee34 | 90 | |
a58823ac DH |
91 | t = status->mtime_client; |
92 | inode->i_ctime = t; | |
93 | inode->i_mtime = t; | |
94 | inode->i_atime = t; | |
95 | inode->i_uid = make_kuid(&init_user_ns, status->owner); | |
96 | inode->i_gid = make_kgid(&init_user_ns, status->group); | |
97 | set_nlink(&vnode->vfs_inode, status->nlink); | |
dd9fbcb8 | 98 | |
a58823ac | 99 | switch (status->type) { |
1da177e4 | 100 | case AFS_FTYPE_FILE: |
a58823ac | 101 | inode->i_mode = S_IFREG | status->mode; |
1da177e4 | 102 | inode->i_op = &afs_file_inode_operations; |
00d3b7a4 | 103 | inode->i_fop = &afs_file_operations; |
f3ddee8d | 104 | inode->i_mapping->a_ops = &afs_fs_aops; |
1da177e4 LT |
105 | break; |
106 | case AFS_FTYPE_DIR: | |
a58823ac | 107 | inode->i_mode = S_IFDIR | status->mode; |
1da177e4 LT |
108 | inode->i_op = &afs_dir_inode_operations; |
109 | inode->i_fop = &afs_dir_file_operations; | |
f3ddee8d | 110 | inode->i_mapping->a_ops = &afs_dir_aops; |
1da177e4 LT |
111 | break; |
112 | case AFS_FTYPE_SYMLINK: | |
944c74f4 | 113 | /* Symlinks with a mode of 0644 are actually mountpoints. */ |
a58823ac | 114 | if ((status->mode & 0777) == 0644) { |
944c74f4 DH |
115 | inode->i_flags |= S_AUTOMOUNT; |
116 | ||
944c74f4 | 117 | set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags); |
944c74f4 DH |
118 | |
119 | inode->i_mode = S_IFDIR | 0555; | |
120 | inode->i_op = &afs_mntpt_inode_operations; | |
121 | inode->i_fop = &afs_mntpt_file_operations; | |
f3ddee8d | 122 | inode->i_mapping->a_ops = &afs_fs_aops; |
944c74f4 | 123 | } else { |
a58823ac | 124 | inode->i_mode = S_IFLNK | status->mode; |
d3e3b7ea | 125 | inode->i_op = &afs_symlink_inode_operations; |
f3ddee8d | 126 | inode->i_mapping->a_ops = &afs_fs_aops; |
944c74f4 | 127 | } |
21fc61c7 | 128 | inode_nohighmem(inode); |
1da177e4 LT |
129 | break; |
130 | default: | |
b134d687 | 131 | dump_vnode(vnode, parent_vnode); |
a58823ac | 132 | write_sequnlock(&vnode->cb_lock); |
160cb957 | 133 | return afs_protocol_error(NULL, -EBADMSG, afs_eproto_file_type); |
1da177e4 LT |
134 | } |
135 | ||
2cd42d19 | 136 | afs_set_i_size(vnode, status->size); |
c435ee34 | 137 | |
a58823ac DH |
138 | vnode->invalid_before = status->data_version; |
139 | inode_set_iversion_raw(&vnode->vfs_inode, status->data_version); | |
140 | ||
141 | if (!scb->have_cb) { | |
142 | /* it's a symlink we just created (the fileserver | |
143 | * didn't give us a callback) */ | |
a58823ac DH |
144 | vnode->cb_expires_at = ktime_get_real_seconds(); |
145 | } else { | |
a58823ac | 146 | vnode->cb_expires_at = scb->callback.expires_at; |
f642404a DH |
147 | old_cbi = rcu_dereference_protected(vnode->cb_interest, |
148 | lockdep_is_held(&vnode->cb_lock.lock)); | |
a58823ac | 149 | if (cbi != old_cbi) |
f642404a | 150 | rcu_assign_pointer(vnode->cb_interest, afs_get_cb_interest(cbi)); |
a58823ac DH |
151 | else |
152 | old_cbi = NULL; | |
153 | set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); | |
154 | } | |
155 | ||
156 | write_sequnlock(&vnode->cb_lock); | |
157 | afs_put_cb_interest(afs_v2net(vnode), old_cbi); | |
1da177e4 | 158 | return 0; |
ec26815a | 159 | } |
1da177e4 | 160 | |
a58823ac DH |
161 | /* |
162 | * Update the core inode struct from a returned status record. | |
163 | */ | |
164 | static void afs_apply_status(struct afs_fs_cursor *fc, | |
165 | struct afs_vnode *vnode, | |
166 | struct afs_status_cb *scb, | |
167 | const afs_dataversion_t *expected_version) | |
168 | { | |
169 | struct afs_file_status *status = &scb->status; | |
170 | struct timespec64 t; | |
171 | umode_t mode; | |
172 | bool data_changed = false; | |
173 | ||
174 | BUG_ON(test_bit(AFS_VNODE_UNSET, &vnode->flags)); | |
175 | ||
176 | if (status->type != vnode->status.type) { | |
a4e530ae KW |
177 | pr_warn("Vnode %llx:%llx:%x changed type %u to %u\n", |
178 | vnode->fid.vid, | |
179 | vnode->fid.vnode, | |
180 | vnode->fid.unique, | |
181 | status->type, vnode->status.type); | |
a58823ac DH |
182 | afs_protocol_error(NULL, -EBADMSG, afs_eproto_bad_status); |
183 | return; | |
184 | } | |
185 | ||
186 | if (status->nlink != vnode->status.nlink) | |
187 | set_nlink(&vnode->vfs_inode, status->nlink); | |
188 | ||
189 | if (status->owner != vnode->status.owner) | |
190 | vnode->vfs_inode.i_uid = make_kuid(&init_user_ns, status->owner); | |
191 | ||
192 | if (status->group != vnode->status.group) | |
193 | vnode->vfs_inode.i_gid = make_kgid(&init_user_ns, status->group); | |
194 | ||
195 | if (status->mode != vnode->status.mode) { | |
196 | mode = vnode->vfs_inode.i_mode; | |
197 | mode &= ~S_IALLUGO; | |
198 | mode |= status->mode; | |
199 | WRITE_ONCE(vnode->vfs_inode.i_mode, mode); | |
200 | } | |
201 | ||
202 | t = status->mtime_client; | |
203 | vnode->vfs_inode.i_ctime = t; | |
204 | vnode->vfs_inode.i_mtime = t; | |
205 | vnode->vfs_inode.i_atime = t; | |
206 | ||
207 | if (vnode->status.data_version != status->data_version) | |
208 | data_changed = true; | |
209 | ||
210 | vnode->status = *status; | |
211 | ||
212 | if (expected_version && | |
213 | *expected_version != status->data_version) { | |
3647e42b DH |
214 | if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) |
215 | pr_warn("kAFS: vnode modified {%llx:%llu} %llx->%llx %s\n", | |
216 | vnode->fid.vid, vnode->fid.vnode, | |
217 | (unsigned long long)*expected_version, | |
218 | (unsigned long long)status->data_version, | |
219 | fc->type ? fc->type->name : "???"); | |
220 | ||
a58823ac DH |
221 | vnode->invalid_before = status->data_version; |
222 | if (vnode->status.type == AFS_FTYPE_DIR) { | |
223 | if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags)) | |
224 | afs_stat_v(vnode, n_inval); | |
225 | } else { | |
226 | set_bit(AFS_VNODE_ZAP_DATA, &vnode->flags); | |
227 | } | |
228 | } else if (vnode->status.type == AFS_FTYPE_DIR) { | |
229 | /* Expected directory change is handled elsewhere so | |
230 | * that we can locally edit the directory and save on a | |
231 | * download. | |
232 | */ | |
233 | if (test_bit(AFS_VNODE_DIR_VALID, &vnode->flags)) | |
234 | data_changed = false; | |
235 | } | |
236 | ||
237 | if (data_changed) { | |
238 | inode_set_iversion_raw(&vnode->vfs_inode, status->data_version); | |
2cd42d19 | 239 | afs_set_i_size(vnode, status->size); |
a58823ac DH |
240 | } |
241 | } | |
242 | ||
243 | /* | |
244 | * Apply a callback to a vnode. | |
245 | */ | |
246 | static void afs_apply_callback(struct afs_fs_cursor *fc, | |
247 | struct afs_vnode *vnode, | |
248 | struct afs_status_cb *scb, | |
249 | unsigned int cb_break) | |
250 | { | |
251 | struct afs_cb_interest *old; | |
252 | struct afs_callback *cb = &scb->callback; | |
253 | ||
254 | if (!afs_cb_is_broken(cb_break, vnode, fc->cbi)) { | |
a58823ac | 255 | vnode->cb_expires_at = cb->expires_at; |
f642404a DH |
256 | old = rcu_dereference_protected(vnode->cb_interest, |
257 | lockdep_is_held(&vnode->cb_lock.lock)); | |
a58823ac | 258 | if (old != fc->cbi) { |
f642404a | 259 | rcu_assign_pointer(vnode->cb_interest, afs_get_cb_interest(fc->cbi)); |
a58823ac DH |
260 | afs_put_cb_interest(afs_v2net(vnode), old); |
261 | } | |
262 | set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); | |
263 | } | |
264 | } | |
265 | ||
266 | /* | |
267 | * Apply the received status and callback to an inode all in the same critical | |
268 | * section to avoid races with afs_validate(). | |
269 | */ | |
270 | void afs_vnode_commit_status(struct afs_fs_cursor *fc, | |
271 | struct afs_vnode *vnode, | |
272 | unsigned int cb_break, | |
273 | const afs_dataversion_t *expected_version, | |
274 | struct afs_status_cb *scb) | |
275 | { | |
276 | if (fc->ac.error != 0) | |
277 | return; | |
278 | ||
279 | write_seqlock(&vnode->cb_lock); | |
280 | ||
a38a7558 DH |
281 | if (scb->have_error) { |
282 | if (scb->status.abort_code == VNOVNODE) { | |
283 | set_bit(AFS_VNODE_DELETED, &vnode->flags); | |
284 | clear_nlink(&vnode->vfs_inode); | |
051d2525 | 285 | __afs_break_callback(vnode, afs_cb_break_for_deleted); |
a38a7558 DH |
286 | } |
287 | } else { | |
288 | if (scb->have_status) | |
289 | afs_apply_status(fc, vnode, scb, expected_version); | |
290 | if (scb->have_cb) | |
291 | afs_apply_callback(fc, vnode, scb, cb_break); | |
292 | } | |
a58823ac DH |
293 | |
294 | write_sequnlock(&vnode->cb_lock); | |
295 | ||
a38a7558 | 296 | if (fc->ac.error == 0 && scb->have_status) |
a58823ac DH |
297 | afs_cache_permit(vnode, fc->key, cb_break, scb); |
298 | } | |
299 | ||
d2ddc776 DH |
300 | /* |
301 | * Fetch file status from the volume. | |
302 | */ | |
a58823ac DH |
303 | int afs_fetch_status(struct afs_vnode *vnode, struct key *key, bool is_new, |
304 | afs_access_t *_caller_access) | |
d2ddc776 | 305 | { |
a58823ac | 306 | struct afs_status_cb *scb; |
d2ddc776 DH |
307 | struct afs_fs_cursor fc; |
308 | int ret; | |
309 | ||
3b6492df | 310 | _enter("%s,{%llx:%llu.%u,S=%lx}", |
d2ddc776 DH |
311 | vnode->volume->name, |
312 | vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique, | |
313 | vnode->flags); | |
314 | ||
a58823ac DH |
315 | scb = kzalloc(sizeof(struct afs_status_cb), GFP_KERNEL); |
316 | if (!scb) | |
317 | return -ENOMEM; | |
318 | ||
d2ddc776 | 319 | ret = -ERESTARTSYS; |
20b8391f | 320 | if (afs_begin_vnode_operation(&fc, vnode, key, true)) { |
a58823ac DH |
321 | afs_dataversion_t data_version = vnode->status.data_version; |
322 | ||
d2ddc776 | 323 | while (afs_select_fileserver(&fc)) { |
68251f0a | 324 | fc.cb_break = afs_calc_vnode_cb_break(vnode); |
a58823ac | 325 | afs_fs_fetch_file_status(&fc, scb, NULL); |
d2ddc776 DH |
326 | } |
327 | ||
a58823ac DH |
328 | if (fc.error) { |
329 | /* Do nothing. */ | |
330 | } else if (is_new) { | |
331 | ret = afs_inode_init_from_status(vnode, key, fc.cbi, | |
332 | NULL, scb); | |
333 | fc.error = ret; | |
334 | if (ret == 0) | |
335 | afs_cache_permit(vnode, key, fc.cb_break, scb); | |
336 | } else { | |
337 | afs_vnode_commit_status(&fc, vnode, fc.cb_break, | |
338 | &data_version, scb); | |
339 | } | |
340 | afs_check_for_remote_deletion(&fc, vnode); | |
d2ddc776 DH |
341 | ret = afs_end_vnode_operation(&fc); |
342 | } | |
343 | ||
a58823ac DH |
344 | if (ret == 0 && _caller_access) |
345 | *_caller_access = scb->status.caller_access; | |
346 | kfree(scb); | |
d2ddc776 DH |
347 | _leave(" = %d", ret); |
348 | return ret; | |
349 | } | |
350 | ||
1da177e4 LT |
351 | /* |
352 | * iget5() comparator | |
353 | */ | |
c435ee34 | 354 | int afs_iget5_test(struct inode *inode, void *opaque) |
1da177e4 | 355 | { |
b8359153 | 356 | struct afs_iget_data *iget_data = opaque; |
3b6492df | 357 | struct afs_vnode *vnode = AFS_FS_I(inode); |
1da177e4 | 358 | |
b8359153 | 359 | return memcmp(&vnode->fid, &iget_data->fid, sizeof(iget_data->fid)) == 0; |
ec26815a | 360 | } |
1da177e4 | 361 | |
bec5eb61 | 362 | /* |
363 | * iget5() comparator for inode created by autocell operations | |
364 | * | |
365 | * These pseudo inodes don't match anything. | |
366 | */ | |
4d673da1 | 367 | static int afs_iget5_pseudo_dir_test(struct inode *inode, void *opaque) |
bec5eb61 | 368 | { |
369 | return 0; | |
370 | } | |
371 | ||
1da177e4 LT |
372 | /* |
373 | * iget5() inode initialiser | |
374 | */ | |
375 | static int afs_iget5_set(struct inode *inode, void *opaque) | |
376 | { | |
b8359153 | 377 | struct afs_iget_data *iget_data = opaque; |
1da177e4 LT |
378 | struct afs_vnode *vnode = AFS_FS_I(inode); |
379 | ||
b8359153 DH |
380 | vnode->fid = iget_data->fid; |
381 | vnode->volume = iget_data->volume; | |
382 | vnode->cb_v_break = iget_data->cb_v_break; | |
383 | vnode->cb_s_break = iget_data->cb_s_break; | |
1da177e4 | 384 | |
3b6492df DH |
385 | /* YFS supports 96-bit vnode IDs, but Linux only supports |
386 | * 64-bit inode numbers. | |
387 | */ | |
b8359153 DH |
388 | inode->i_ino = iget_data->fid.vnode; |
389 | inode->i_generation = iget_data->fid.unique; | |
1da177e4 | 390 | return 0; |
ec26815a | 391 | } |
1da177e4 | 392 | |
bec5eb61 | 393 | /* |
4d673da1 DH |
394 | * Create an inode for a dynamic root directory or an autocell dynamic |
395 | * automount dir. | |
bec5eb61 | 396 | */ |
4d673da1 | 397 | struct inode *afs_iget_pseudo_dir(struct super_block *sb, bool root) |
bec5eb61 | 398 | { |
bec5eb61 | 399 | struct afs_super_info *as; |
400 | struct afs_vnode *vnode; | |
bec5eb61 | 401 | struct inode *inode; |
402 | static atomic_t afs_autocell_ino; | |
403 | ||
b8359153 DH |
404 | struct afs_iget_data iget_data = { |
405 | .cb_v_break = 0, | |
406 | .cb_s_break = 0, | |
407 | }; | |
408 | ||
4d673da1 | 409 | _enter(""); |
bec5eb61 | 410 | |
bec5eb61 | 411 | as = sb->s_fs_info; |
4d673da1 | 412 | if (as->volume) { |
b8359153 DH |
413 | iget_data.volume = as->volume; |
414 | iget_data.fid.vid = as->volume->vid; | |
4d673da1 DH |
415 | } |
416 | if (root) { | |
b8359153 DH |
417 | iget_data.fid.vnode = 1; |
418 | iget_data.fid.unique = 1; | |
4d673da1 | 419 | } else { |
b8359153 DH |
420 | iget_data.fid.vnode = atomic_inc_return(&afs_autocell_ino); |
421 | iget_data.fid.unique = 0; | |
4d673da1 | 422 | } |
bec5eb61 | 423 | |
b8359153 | 424 | inode = iget5_locked(sb, iget_data.fid.vnode, |
4d673da1 | 425 | afs_iget5_pseudo_dir_test, afs_iget5_set, |
b8359153 | 426 | &iget_data); |
bec5eb61 | 427 | if (!inode) { |
428 | _leave(" = -ENOMEM"); | |
429 | return ERR_PTR(-ENOMEM); | |
430 | } | |
431 | ||
3b6492df | 432 | _debug("GOT INODE %p { ino=%lu, vl=%llx, vn=%llx, u=%x }", |
b8359153 DH |
433 | inode, inode->i_ino, iget_data.fid.vid, iget_data.fid.vnode, |
434 | iget_data.fid.unique); | |
bec5eb61 | 435 | |
436 | vnode = AFS_FS_I(inode); | |
437 | ||
438 | /* there shouldn't be an existing inode */ | |
439 | BUG_ON(!(inode->i_state & I_NEW)); | |
440 | ||
441 | inode->i_size = 0; | |
442 | inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
4d673da1 DH |
443 | if (root) { |
444 | inode->i_op = &afs_dynroot_inode_operations; | |
473ef57a | 445 | inode->i_fop = &simple_dir_operations; |
4d673da1 DH |
446 | } else { |
447 | inode->i_op = &afs_autocell_inode_operations; | |
448 | } | |
bfe86848 | 449 | set_nlink(inode, 2); |
a0a5386a EB |
450 | inode->i_uid = GLOBAL_ROOT_UID; |
451 | inode->i_gid = GLOBAL_ROOT_GID; | |
ba25b81e | 452 | inode->i_ctime = inode->i_atime = inode->i_mtime = current_time(inode); |
bec5eb61 | 453 | inode->i_blocks = 0; |
a01179e6 | 454 | inode_set_iversion_raw(inode, 0); |
bec5eb61 | 455 | inode->i_generation = 0; |
456 | ||
457 | set_bit(AFS_VNODE_PSEUDODIR, &vnode->flags); | |
4d673da1 DH |
458 | if (!root) { |
459 | set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags); | |
460 | inode->i_flags |= S_AUTOMOUNT; | |
461 | } | |
462 | ||
463 | inode->i_flags |= S_NOATIME; | |
bec5eb61 | 464 | unlock_new_inode(inode); |
465 | _leave(" = %p", inode); | |
466 | return inode; | |
467 | } | |
468 | ||
402cb8dd DH |
469 | /* |
470 | * Get a cache cookie for an inode. | |
471 | */ | |
472 | static void afs_get_inode_cache(struct afs_vnode *vnode) | |
473 | { | |
474 | #ifdef CONFIG_AFS_FSCACHE | |
475 | struct { | |
476 | u32 vnode_id; | |
477 | u32 unique; | |
478 | u32 vnode_id_ext[2]; /* Allow for a 96-bit key */ | |
479 | } __packed key; | |
480 | struct afs_vnode_cache_aux aux; | |
481 | ||
f3ddee8d DH |
482 | if (vnode->status.type == AFS_FTYPE_DIR) { |
483 | vnode->cache = NULL; | |
484 | return; | |
485 | } | |
486 | ||
402cb8dd DH |
487 | key.vnode_id = vnode->fid.vnode; |
488 | key.unique = vnode->fid.unique; | |
3b6492df DH |
489 | key.vnode_id_ext[0] = vnode->fid.vnode >> 32; |
490 | key.vnode_id_ext[1] = vnode->fid.vnode_hi; | |
402cb8dd DH |
491 | aux.data_version = vnode->status.data_version; |
492 | ||
493 | vnode->cache = fscache_acquire_cookie(vnode->volume->cache, | |
494 | &afs_vnode_cache_index_def, | |
495 | &key, sizeof(key), | |
496 | &aux, sizeof(aux), | |
ee1235a9 | 497 | vnode, vnode->status.size, true); |
402cb8dd DH |
498 | #endif |
499 | } | |
500 | ||
1da177e4 LT |
501 | /* |
502 | * inode retrieval | |
503 | */ | |
260a9803 | 504 | struct inode *afs_iget(struct super_block *sb, struct key *key, |
b8359153 DH |
505 | struct afs_iget_data *iget_data, |
506 | struct afs_status_cb *scb, | |
a58823ac | 507 | struct afs_cb_interest *cbi, |
b134d687 | 508 | struct afs_vnode *parent_vnode) |
1da177e4 | 509 | { |
1da177e4 LT |
510 | struct afs_super_info *as; |
511 | struct afs_vnode *vnode; | |
b8359153 | 512 | struct afs_fid *fid = &iget_data->fid; |
1da177e4 LT |
513 | struct inode *inode; |
514 | int ret; | |
515 | ||
3b6492df | 516 | _enter(",{%llx:%llu.%u},,", fid->vid, fid->vnode, fid->unique); |
1da177e4 LT |
517 | |
518 | as = sb->s_fs_info; | |
b8359153 | 519 | iget_data->volume = as->volume; |
1da177e4 LT |
520 | |
521 | inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set, | |
b8359153 | 522 | iget_data); |
1da177e4 LT |
523 | if (!inode) { |
524 | _leave(" = -ENOMEM"); | |
08e0e7c8 | 525 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
526 | } |
527 | ||
3b6492df | 528 | _debug("GOT INODE %p { vl=%llx vn=%llx, u=%x }", |
08e0e7c8 DH |
529 | inode, fid->vid, fid->vnode, fid->unique); |
530 | ||
1da177e4 LT |
531 | vnode = AFS_FS_I(inode); |
532 | ||
533 | /* deal with an existing inode */ | |
534 | if (!(inode->i_state & I_NEW)) { | |
08e0e7c8 DH |
535 | _leave(" = %p", inode); |
536 | return inode; | |
1da177e4 LT |
537 | } |
538 | ||
a58823ac | 539 | if (!scb) { |
260a9803 | 540 | /* it's a remotely extant inode */ |
a58823ac | 541 | ret = afs_fetch_status(vnode, key, true, NULL); |
260a9803 DH |
542 | if (ret < 0) |
543 | goto bad_inode; | |
544 | } else { | |
a58823ac DH |
545 | ret = afs_inode_init_from_status(vnode, key, cbi, parent_vnode, |
546 | scb); | |
547 | if (ret < 0) | |
548 | goto bad_inode; | |
260a9803 DH |
549 | } |
550 | ||
5800db81 DH |
551 | afs_get_inode_cache(vnode); |
552 | ||
1da177e4 | 553 | /* success */ |
260a9803 | 554 | clear_bit(AFS_VNODE_UNSET, &vnode->flags); |
08e0e7c8 | 555 | inode->i_flags |= S_NOATIME; |
1da177e4 | 556 | unlock_new_inode(inode); |
7c712458 | 557 | _leave(" = %p", inode); |
08e0e7c8 | 558 | return inode; |
1da177e4 LT |
559 | |
560 | /* failure */ | |
ec26815a | 561 | bad_inode: |
aa7fa240 | 562 | iget_failed(inode); |
1da177e4 | 563 | _leave(" = %d [bad]", ret); |
08e0e7c8 | 564 | return ERR_PTR(ret); |
ec26815a | 565 | } |
1da177e4 | 566 | |
416351f2 DH |
567 | /* |
568 | * mark the data attached to an inode as obsolete due to a write on the server | |
569 | * - might also want to ditch all the outstanding writes and dirty pages | |
570 | */ | |
571 | void afs_zap_data(struct afs_vnode *vnode) | |
572 | { | |
3b6492df | 573 | _enter("{%llx:%llu}", vnode->fid.vid, vnode->fid.vnode); |
416351f2 | 574 | |
c1515999 DH |
575 | #ifdef CONFIG_AFS_FSCACHE |
576 | fscache_invalidate(vnode->cache); | |
577 | #endif | |
578 | ||
416351f2 | 579 | /* nuke all the non-dirty pages that aren't locked, mapped or being |
0f300ca9 DH |
580 | * written back in a regular file and completely discard the pages in a |
581 | * directory or symlink */ | |
582 | if (S_ISREG(vnode->vfs_inode.i_mode)) | |
583 | invalidate_remote_inode(&vnode->vfs_inode); | |
584 | else | |
585 | invalidate_inode_pages2(vnode->vfs_inode.i_mapping); | |
416351f2 DH |
586 | } |
587 | ||
260a9803 | 588 | /* |
c925bd0a | 589 | * Check the validity of a vnode/inode. |
260a9803 | 590 | */ |
c925bd0a | 591 | bool afs_check_validity(struct afs_vnode *vnode) |
260a9803 | 592 | { |
f642404a DH |
593 | struct afs_cb_interest *cbi; |
594 | struct afs_server *server; | |
595 | struct afs_volume *volume = vnode->volume; | |
051d2525 | 596 | enum afs_cb_break_reason need_clear = afs_cb_break_no_break; |
c435ee34 | 597 | time64_t now = ktime_get_real_seconds(); |
051d2525 | 598 | bool valid; |
f642404a DH |
599 | unsigned int cb_break, cb_s_break, cb_v_break; |
600 | int seq = 0; | |
260a9803 | 601 | |
f642404a DH |
602 | do { |
603 | read_seqbegin_or_lock(&vnode->cb_lock, &seq); | |
604 | cb_v_break = READ_ONCE(volume->cb_v_break); | |
605 | cb_break = vnode->cb_break; | |
606 | ||
607 | if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) { | |
608 | cbi = rcu_dereference(vnode->cb_interest); | |
609 | server = rcu_dereference(cbi->server); | |
610 | cb_s_break = READ_ONCE(server->cb_s_break); | |
611 | ||
612 | if (vnode->cb_s_break != cb_s_break || | |
613 | vnode->cb_v_break != cb_v_break) { | |
614 | vnode->cb_s_break = cb_s_break; | |
615 | vnode->cb_v_break = cb_v_break; | |
051d2525 | 616 | need_clear = afs_cb_break_for_vsbreak; |
f642404a DH |
617 | valid = false; |
618 | } else if (test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) { | |
051d2525 | 619 | need_clear = afs_cb_break_for_zap; |
f642404a DH |
620 | valid = false; |
621 | } else if (vnode->cb_expires_at - 10 <= now) { | |
051d2525 | 622 | need_clear = afs_cb_break_for_lapsed; |
f642404a DH |
623 | valid = false; |
624 | } else { | |
625 | valid = true; | |
626 | } | |
627 | } else if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { | |
68251f0a | 628 | valid = true; |
f642404a DH |
629 | } else { |
630 | vnode->cb_v_break = cb_v_break; | |
631 | valid = false; | |
260a9803 | 632 | } |
260a9803 | 633 | |
f642404a DH |
634 | } while (need_seqretry(&vnode->cb_lock, seq)); |
635 | ||
636 | done_seqretry(&vnode->cb_lock, seq); | |
61c347ba | 637 | |
051d2525 | 638 | if (need_clear != afs_cb_break_no_break) { |
61c347ba DH |
639 | write_seqlock(&vnode->cb_lock); |
640 | if (cb_break == vnode->cb_break) | |
051d2525 DH |
641 | __afs_break_callback(vnode, need_clear); |
642 | else | |
643 | trace_afs_cb_miss(&vnode->fid, need_clear); | |
61c347ba DH |
644 | write_sequnlock(&vnode->cb_lock); |
645 | valid = false; | |
646 | } | |
647 | ||
c925bd0a DH |
648 | return valid; |
649 | } | |
650 | ||
651 | /* | |
652 | * validate a vnode/inode | |
653 | * - there are several things we need to check | |
654 | * - parent dir data changes (rm, rmdir, rename, mkdir, create, link, | |
655 | * symlink) | |
656 | * - parent dir metadata changed (security changes) | |
657 | * - dentry data changed (write, truncate) | |
658 | * - dentry metadata changed (security changes) | |
659 | */ | |
660 | int afs_validate(struct afs_vnode *vnode, struct key *key) | |
661 | { | |
662 | bool valid; | |
663 | int ret; | |
664 | ||
665 | _enter("{v={%llx:%llu} fl=%lx},%x", | |
666 | vnode->fid.vid, vnode->fid.vnode, vnode->flags, | |
667 | key_serial(key)); | |
668 | ||
f642404a | 669 | rcu_read_lock(); |
c925bd0a | 670 | valid = afs_check_validity(vnode); |
f642404a | 671 | rcu_read_unlock(); |
440fbc3a DH |
672 | |
673 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) | |
674 | clear_nlink(&vnode->vfs_inode); | |
675 | ||
c435ee34 | 676 | if (valid) |
260a9803 DH |
677 | goto valid; |
678 | ||
b61f7dcf | 679 | down_write(&vnode->validate_lock); |
260a9803 DH |
680 | |
681 | /* if the promise has expired, we need to check the server again to get | |
682 | * a new promise - note that if the (parent) directory's metadata was | |
683 | * changed then the security may be different and we may no longer have | |
684 | * access */ | |
c435ee34 | 685 | if (!test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) { |
260a9803 | 686 | _debug("not promised"); |
a58823ac | 687 | ret = afs_fetch_status(vnode, key, false, NULL); |
c435ee34 DH |
688 | if (ret < 0) { |
689 | if (ret == -ENOENT) { | |
690 | set_bit(AFS_VNODE_DELETED, &vnode->flags); | |
691 | ret = -ESTALE; | |
692 | } | |
260a9803 | 693 | goto error_unlock; |
c435ee34 | 694 | } |
260a9803 DH |
695 | _debug("new promise [fl=%lx]", vnode->flags); |
696 | } | |
697 | ||
698 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { | |
699 | _debug("file already deleted"); | |
700 | ret = -ESTALE; | |
701 | goto error_unlock; | |
702 | } | |
703 | ||
704 | /* if the vnode's data version number changed then its contents are | |
705 | * different */ | |
416351f2 DH |
706 | if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) |
707 | afs_zap_data(vnode); | |
b61f7dcf | 708 | up_write(&vnode->validate_lock); |
260a9803 DH |
709 | valid: |
710 | _leave(" = 0"); | |
711 | return 0; | |
712 | ||
713 | error_unlock: | |
b61f7dcf | 714 | up_write(&vnode->validate_lock); |
260a9803 DH |
715 | _leave(" = %d", ret); |
716 | return ret; | |
717 | } | |
718 | ||
1da177e4 LT |
719 | /* |
720 | * read the attributes of an inode | |
721 | */ | |
a528d35e DH |
722 | int afs_getattr(const struct path *path, struct kstat *stat, |
723 | u32 request_mask, unsigned int query_flags) | |
1da177e4 | 724 | { |
a528d35e | 725 | struct inode *inode = d_inode(path->dentry); |
c435ee34 DH |
726 | struct afs_vnode *vnode = AFS_FS_I(inode); |
727 | int seq = 0; | |
1da177e4 | 728 | |
d6e43f75 | 729 | _enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation); |
1da177e4 | 730 | |
c435ee34 DH |
731 | do { |
732 | read_seqbegin_or_lock(&vnode->cb_lock, &seq); | |
733 | generic_fillattr(inode, stat); | |
734 | } while (need_seqretry(&vnode->cb_lock, seq)); | |
735 | ||
736 | done_seqretry(&vnode->cb_lock, seq); | |
1da177e4 | 737 | return 0; |
ec26815a | 738 | } |
1da177e4 | 739 | |
bec5eb61 | 740 | /* |
741 | * discard an AFS inode | |
742 | */ | |
743 | int afs_drop_inode(struct inode *inode) | |
744 | { | |
745 | _enter(""); | |
746 | ||
747 | if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags)) | |
748 | return generic_delete_inode(inode); | |
749 | else | |
750 | return generic_drop_inode(inode); | |
751 | } | |
752 | ||
1da177e4 LT |
753 | /* |
754 | * clear an AFS inode | |
755 | */ | |
b57922d9 | 756 | void afs_evict_inode(struct inode *inode) |
1da177e4 | 757 | { |
f642404a | 758 | struct afs_cb_interest *cbi; |
1da177e4 LT |
759 | struct afs_vnode *vnode; |
760 | ||
761 | vnode = AFS_FS_I(inode); | |
762 | ||
3b6492df | 763 | _enter("{%llx:%llu.%d}", |
260a9803 | 764 | vnode->fid.vid, |
1da177e4 | 765 | vnode->fid.vnode, |
c435ee34 | 766 | vnode->fid.unique); |
1da177e4 | 767 | |
08e0e7c8 DH |
768 | _debug("CLEAR INODE %p", inode); |
769 | ||
770 | ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode); | |
771 | ||
91b0abe3 | 772 | truncate_inode_pages_final(&inode->i_data); |
dbd5768f | 773 | clear_inode(inode); |
b57922d9 | 774 | |
f642404a DH |
775 | write_seqlock(&vnode->cb_lock); |
776 | cbi = rcu_dereference_protected(vnode->cb_interest, | |
777 | lockdep_is_held(&vnode->cb_lock.lock)); | |
778 | if (cbi) { | |
779 | afs_put_cb_interest(afs_i2net(inode), cbi); | |
780 | rcu_assign_pointer(vnode->cb_interest, NULL); | |
08e0e7c8 | 781 | } |
f642404a | 782 | write_sequnlock(&vnode->cb_lock); |
1da177e4 | 783 | |
4343d008 DH |
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 | } | |
1da177e4 | 790 | |
9b3f26c9 | 791 | #ifdef CONFIG_AFS_FSCACHE |
402cb8dd DH |
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 | } | |
1da177e4 LT |
800 | #endif |
801 | ||
a1b879ee | 802 | afs_prune_wb_keys(vnode); |
fe342cf7 | 803 | afs_put_permits(rcu_access_pointer(vnode->permit_cache)); |
79ddbfa5 DH |
804 | key_put(vnode->silly_key); |
805 | vnode->silly_key = NULL; | |
59d49076 DH |
806 | key_put(vnode->lock_key); |
807 | vnode->lock_key = NULL; | |
1da177e4 | 808 | _leave(""); |
ec26815a | 809 | } |
31143d5d DH |
810 | |
811 | /* | |
812 | * set the attributes of an inode | |
813 | */ | |
814 | int afs_setattr(struct dentry *dentry, struct iattr *attr) | |
815 | { | |
d2ddc776 | 816 | struct afs_fs_cursor fc; |
a58823ac | 817 | struct afs_status_cb *scb; |
2b0143b5 | 818 | struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); |
31143d5d | 819 | struct key *key; |
a58823ac | 820 | int ret = -ENOMEM; |
31143d5d | 821 | |
3b6492df | 822 | _enter("{%llx:%llu},{n=%pd},%x", |
a455589f | 823 | vnode->fid.vid, vnode->fid.vnode, dentry, |
31143d5d DH |
824 | attr->ia_valid); |
825 | ||
826 | if (!(attr->ia_valid & (ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID | | |
827 | ATTR_MTIME))) { | |
828 | _leave(" = 0 [unsupported]"); | |
829 | return 0; | |
830 | } | |
831 | ||
a58823ac DH |
832 | scb = kzalloc(sizeof(struct afs_status_cb), GFP_KERNEL); |
833 | if (!scb) | |
834 | goto error; | |
835 | ||
31143d5d | 836 | /* flush any dirty data outstanding on a regular file */ |
4343d008 | 837 | if (S_ISREG(vnode->vfs_inode.i_mode)) |
31143d5d | 838 | filemap_write_and_wait(vnode->vfs_inode.i_mapping); |
31143d5d DH |
839 | |
840 | if (attr->ia_valid & ATTR_FILE) { | |
215804a9 | 841 | key = afs_file_key(attr->ia_file); |
31143d5d DH |
842 | } else { |
843 | key = afs_request_key(vnode->volume->cell); | |
844 | if (IS_ERR(key)) { | |
845 | ret = PTR_ERR(key); | |
a58823ac | 846 | goto error_scb; |
31143d5d DH |
847 | } |
848 | } | |
849 | ||
d2ddc776 | 850 | ret = -ERESTARTSYS; |
20b8391f | 851 | if (afs_begin_vnode_operation(&fc, vnode, key, false)) { |
a58823ac DH |
852 | afs_dataversion_t data_version = vnode->status.data_version; |
853 | ||
854 | if (attr->ia_valid & ATTR_SIZE) | |
855 | data_version++; | |
856 | ||
d2ddc776 | 857 | while (afs_select_fileserver(&fc)) { |
68251f0a | 858 | fc.cb_break = afs_calc_vnode_cb_break(vnode); |
a58823ac | 859 | afs_fs_setattr(&fc, attr, scb); |
d2ddc776 DH |
860 | } |
861 | ||
a58823ac DH |
862 | afs_check_for_remote_deletion(&fc, vnode); |
863 | afs_vnode_commit_status(&fc, vnode, fc.cb_break, | |
864 | &data_version, scb); | |
d2ddc776 DH |
865 | ret = afs_end_vnode_operation(&fc); |
866 | } | |
867 | ||
31143d5d DH |
868 | if (!(attr->ia_valid & ATTR_FILE)) |
869 | key_put(key); | |
870 | ||
a58823ac DH |
871 | error_scb: |
872 | kfree(scb); | |
31143d5d DH |
873 | error: |
874 | _leave(" = %d", ret); | |
875 | return ret; | |
876 | } |