1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* dir.c: AFS filesystem directory handling
3 *
4 * Copyright (C) 2002, 2018 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8 #include <linux/kernel.h>
9 #include <linux/fs.h>
10 #include <linux/namei.h>
11 #include <linux/pagemap.h>
12 #include <linux/swap.h>
13 #include <linux/ctype.h>
14 #include <linux/sched.h>
15 #include <linux/iversion.h>
16 #include <linux/iov_iter.h>
17 #include <linux/task_io_accounting_ops.h>
18 #include "internal.h"
19 #include "afs_fs.h"
20 #include "xdr_fs.h"
21
22 static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
23 unsigned int flags);
24 static int afs_dir_open(struct inode *inode, struct file *file);
25 static int afs_readdir(struct file *file, struct dir_context *ctx);
26 static int afs_d_revalidate(struct inode *dir, const struct qstr *name,
27 struct dentry *dentry, unsigned int flags);
28 static int afs_d_delete(const struct dentry *dentry);
29 static void afs_d_iput(struct dentry *dentry, struct inode *inode);
30 static bool afs_lookup_one_filldir(struct dir_context *ctx, const char *name, int nlen,
31 loff_t fpos, u64 ino, unsigned dtype);
32 static bool afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen,
33 loff_t fpos, u64 ino, unsigned dtype);
34 static int afs_create(struct mnt_idmap *idmap, struct inode *dir,
35 struct dentry *dentry, umode_t mode, bool excl);
36 static struct dentry *afs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
37 struct dentry *dentry, umode_t mode);
38 static int afs_rmdir(struct inode *dir, struct dentry *dentry);
39 static int afs_unlink(struct inode *dir, struct dentry *dentry);
40 static int afs_link(struct dentry *from, struct inode *dir,
41 struct dentry *dentry);
42 static int afs_symlink(struct mnt_idmap *idmap, struct inode *dir,
43 struct dentry *dentry, const char *content);
44 static int afs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
45 struct dentry *old_dentry, struct inode *new_dir,
46 struct dentry *new_dentry, unsigned int flags);
47
48 const struct file_operations afs_dir_file_operations = {
49 .open = afs_dir_open,
50 .release = afs_release,
51 .iterate_shared = afs_readdir,
52 .lock = afs_lock,
53 .llseek = generic_file_llseek,
54 };
55
56 const struct inode_operations afs_dir_inode_operations = {
57 .create = afs_create,
58 .lookup = afs_lookup,
59 .link = afs_link,
60 .unlink = afs_unlink,
61 .symlink = afs_symlink,
62 .mkdir = afs_mkdir,
63 .rmdir = afs_rmdir,
64 .rename = afs_rename,
65 .permission = afs_permission,
66 .getattr = afs_getattr,
67 .setattr = afs_setattr,
68 };
69
70 const struct address_space_operations afs_dir_aops = {
71 .writepages = afs_single_writepages,
72 };
73
74 const struct dentry_operations afs_fs_dentry_operations = {
75 .d_revalidate = afs_d_revalidate,
76 .d_delete = afs_d_delete,
77 .d_release = afs_d_release,
78 .d_automount = afs_d_automount,
79 .d_iput = afs_d_iput,
80 };
81
82 struct afs_lookup_one_cookie {
83 struct dir_context ctx;
84 struct qstr name;
85 bool found;
86 struct afs_fid fid;
87 };
88
89 struct afs_lookup_cookie {
90 struct dir_context ctx;
91 struct qstr name;
92 unsigned short nr_fids;
93 struct afs_fid fids[50];
94 };
95
afs_dir_unuse_cookie(struct afs_vnode * dvnode,int ret)96 static void afs_dir_unuse_cookie(struct afs_vnode *dvnode, int ret)
97 {
98 if (ret == 0) {
99 struct afs_vnode_cache_aux aux;
100 loff_t i_size = i_size_read(&dvnode->netfs.inode);
101
102 afs_set_cache_aux(dvnode, &aux);
103 fscache_unuse_cookie(afs_vnode_cache(dvnode), &aux, &i_size);
104 } else {
105 fscache_unuse_cookie(afs_vnode_cache(dvnode), NULL, NULL);
106 }
107 }
108
109 /*
110 * Iterate through a kmapped directory segment, dumping a summary of
111 * the contents.
112 */
afs_dir_dump_step(void * iter_base,size_t progress,size_t len,void * priv,void * priv2)113 static size_t afs_dir_dump_step(void *iter_base, size_t progress, size_t len,
114 void *priv, void *priv2)
115 {
116 do {
117 union afs_xdr_dir_block *block = iter_base;
118
119 pr_warn("[%05zx] %32phN\n", progress, block);
120 iter_base += AFS_DIR_BLOCK_SIZE;
121 progress += AFS_DIR_BLOCK_SIZE;
122 len -= AFS_DIR_BLOCK_SIZE;
123 } while (len > 0);
124
125 return len;
126 }
127
128 /*
129 * Dump the contents of a directory.
130 */
afs_dir_dump(struct afs_vnode * dvnode)131 static void afs_dir_dump(struct afs_vnode *dvnode)
132 {
133 struct iov_iter iter;
134 unsigned long long i_size = i_size_read(&dvnode->netfs.inode);
135
136 pr_warn("DIR %llx:%llx is=%llx\n",
137 dvnode->fid.vid, dvnode->fid.vnode, i_size);
138
139 iov_iter_folio_queue(&iter, ITER_SOURCE, dvnode->directory, 0, 0, i_size);
140 iterate_folioq(&iter, iov_iter_count(&iter), NULL, NULL,
141 afs_dir_dump_step);
142 }
143
144 /*
145 * check that a directory folio is valid
146 */
afs_dir_check_block(struct afs_vnode * dvnode,size_t progress,union afs_xdr_dir_block * block)147 static bool afs_dir_check_block(struct afs_vnode *dvnode, size_t progress,
148 union afs_xdr_dir_block *block)
149 {
150 if (block->hdr.magic != AFS_DIR_MAGIC) {
151 pr_warn("%s(%lx): [%zx] bad magic %04x\n",
152 __func__, dvnode->netfs.inode.i_ino,
153 progress, ntohs(block->hdr.magic));
154 trace_afs_dir_check_failed(dvnode, progress);
155 trace_afs_file_error(dvnode, -EIO, afs_file_error_dir_bad_magic);
156 return false;
157 }
158
159 /* Make sure each block is NUL terminated so we can reasonably
160 * use string functions on it. The filenames in the folio
161 * *should* be NUL-terminated anyway.
162 */
163 ((u8 *)block)[AFS_DIR_BLOCK_SIZE - 1] = 0;
164 afs_stat_v(dvnode, n_read_dir);
165 return true;
166 }
167
168 /*
169 * Iterate through a kmapped directory segment, checking the content.
170 */
afs_dir_check_step(void * iter_base,size_t progress,size_t len,void * priv,void * priv2)171 static size_t afs_dir_check_step(void *iter_base, size_t progress, size_t len,
172 void *priv, void *priv2)
173 {
174 struct afs_vnode *dvnode = priv;
175
176 if (WARN_ON_ONCE(progress % AFS_DIR_BLOCK_SIZE ||
177 len % AFS_DIR_BLOCK_SIZE))
178 return len;
179
180 do {
181 if (!afs_dir_check_block(dvnode, progress, iter_base))
182 break;
183 iter_base += AFS_DIR_BLOCK_SIZE;
184 len -= AFS_DIR_BLOCK_SIZE;
185 } while (len > 0);
186
187 return len;
188 }
189
190 /*
191 * Check all the blocks in a directory.
192 */
afs_dir_check(struct afs_vnode * dvnode)193 static int afs_dir_check(struct afs_vnode *dvnode)
194 {
195 struct iov_iter iter;
196 unsigned long long i_size = i_size_read(&dvnode->netfs.inode);
197 size_t checked = 0;
198
199 if (unlikely(!i_size))
200 return 0;
201
202 iov_iter_folio_queue(&iter, ITER_SOURCE, dvnode->directory, 0, 0, i_size);
203 checked = iterate_folioq(&iter, iov_iter_count(&iter), dvnode, NULL,
204 afs_dir_check_step);
205 if (checked != i_size) {
206 afs_dir_dump(dvnode);
207 return -EIO;
208 }
209 return 0;
210 }
211
212 /*
213 * open an AFS directory file
214 */
afs_dir_open(struct inode * inode,struct file * file)215 static int afs_dir_open(struct inode *inode, struct file *file)
216 {
217 _enter("{%lu}", inode->i_ino);
218
219 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
220 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
221
222 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags))
223 return -ENOENT;
224
225 return afs_open(inode, file);
226 }
227
228 /*
229 * Read a file in a single download.
230 */
afs_do_read_single(struct afs_vnode * dvnode,struct file * file)231 static ssize_t afs_do_read_single(struct afs_vnode *dvnode, struct file *file)
232 {
233 struct iov_iter iter;
234 ssize_t ret;
235 loff_t i_size;
236 bool is_dir = (S_ISDIR(dvnode->netfs.inode.i_mode) &&
237 !test_bit(AFS_VNODE_MOUNTPOINT, &dvnode->flags));
238
239 i_size = i_size_read(&dvnode->netfs.inode);
240 if (is_dir) {
241 if (i_size < AFS_DIR_BLOCK_SIZE)
242 return afs_bad(dvnode, afs_file_error_dir_small);
243 if (i_size > AFS_DIR_BLOCK_SIZE * 1024) {
244 trace_afs_file_error(dvnode, -EFBIG, afs_file_error_dir_big);
245 return -EFBIG;
246 }
247 } else {
248 if (i_size > AFSPATHMAX) {
249 trace_afs_file_error(dvnode, -EFBIG, afs_file_error_dir_big);
250 return -EFBIG;
251 }
252 }
253
254 /* Expand the storage. TODO: Shrink the storage too. */
255 if (dvnode->directory_size < i_size) {
256 size_t cur_size = dvnode->directory_size;
257
258 ret = netfs_alloc_folioq_buffer(NULL,
259 &dvnode->directory, &cur_size, i_size,
260 mapping_gfp_mask(dvnode->netfs.inode.i_mapping));
261 dvnode->directory_size = cur_size;
262 if (ret < 0)
263 return ret;
264 }
265
266 iov_iter_folio_queue(&iter, ITER_DEST, dvnode->directory, 0, 0, dvnode->directory_size);
267
268 /* AFS requires us to perform the read of a directory synchronously as
269 * a single unit to avoid issues with the directory contents being
270 * changed between reads.
271 */
272 ret = netfs_read_single(&dvnode->netfs.inode, file, &iter);
273 if (ret >= 0) {
274 i_size = i_size_read(&dvnode->netfs.inode);
275 if (i_size > ret) {
276 /* The content has grown, so we need to expand the
277 * buffer.
278 */
279 ret = -ESTALE;
280 } else if (is_dir) {
281 int ret2 = afs_dir_check(dvnode);
282
283 if (ret2 < 0)
284 ret = ret2;
285 } else if (i_size < folioq_folio_size(dvnode->directory, 0)) {
286 /* NUL-terminate a symlink. */
287 char *symlink = kmap_local_folio(folioq_folio(dvnode->directory, 0), 0);
288
289 symlink[i_size] = 0;
290 kunmap_local(symlink);
291 }
292 }
293
294 return ret;
295 }
296
afs_read_single(struct afs_vnode * dvnode,struct file * file)297 ssize_t afs_read_single(struct afs_vnode *dvnode, struct file *file)
298 {
299 ssize_t ret;
300
301 fscache_use_cookie(afs_vnode_cache(dvnode), false);
302 ret = afs_do_read_single(dvnode, file);
303 fscache_unuse_cookie(afs_vnode_cache(dvnode), NULL, NULL);
304 return ret;
305 }
306
307 /*
308 * Read the directory into a folio_queue buffer in one go, scrubbing the
309 * previous contents. We return -ESTALE if the caller needs to call us again.
310 */
afs_read_dir(struct afs_vnode * dvnode,struct file * file)311 ssize_t afs_read_dir(struct afs_vnode *dvnode, struct file *file)
312 __acquires(&dvnode->validate_lock)
313 {
314 ssize_t ret;
315 loff_t i_size;
316
317 i_size = i_size_read(&dvnode->netfs.inode);
318
319 ret = -ERESTARTSYS;
320 if (down_read_killable(&dvnode->validate_lock) < 0)
321 goto error;
322
323 /* We only need to reread the data if it became invalid - or if we
324 * haven't read it yet.
325 */
326 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
327 test_bit(AFS_VNODE_DIR_READ, &dvnode->flags)) {
328 ret = i_size;
329 goto valid;
330 }
331
332 up_read(&dvnode->validate_lock);
333 if (down_write_killable(&dvnode->validate_lock) < 0)
334 goto error;
335
336 if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
337 afs_invalidate_cache(dvnode, 0);
338
339 if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) ||
340 !test_bit(AFS_VNODE_DIR_READ, &dvnode->flags)) {
341 trace_afs_reload_dir(dvnode);
342 ret = afs_read_single(dvnode, file);
343 if (ret < 0)
344 goto error_unlock;
345
346 // TODO: Trim excess pages
347
348 set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags);
349 set_bit(AFS_VNODE_DIR_READ, &dvnode->flags);
350 } else {
351 ret = i_size;
352 }
353
354 downgrade_write(&dvnode->validate_lock);
355 valid:
356 return ret;
357
358 error_unlock:
359 up_write(&dvnode->validate_lock);
360 error:
361 _leave(" = %zd", ret);
362 return ret;
363 }
364
365 /*
366 * deal with one block in an AFS directory
367 */
afs_dir_iterate_block(struct afs_vnode * dvnode,struct dir_context * ctx,union afs_xdr_dir_block * block)368 static int afs_dir_iterate_block(struct afs_vnode *dvnode,
369 struct dir_context *ctx,
370 union afs_xdr_dir_block *block)
371 {
372 union afs_xdr_dirent *dire;
373 unsigned int blknum, base, hdr, pos, next, nr_slots;
374 size_t nlen;
375 int tmp;
376
377 blknum = ctx->pos / AFS_DIR_BLOCK_SIZE;
378 base = blknum * AFS_DIR_SLOTS_PER_BLOCK;
379 hdr = (blknum == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS);
380 pos = DIV_ROUND_UP(ctx->pos, AFS_DIR_DIRENT_SIZE) - base;
381
382 _enter("%llx,%x", ctx->pos, blknum);
383
384 /* walk through the block, an entry at a time */
385 for (unsigned int slot = hdr; slot < AFS_DIR_SLOTS_PER_BLOCK; slot = next) {
386 /* skip entries marked unused in the bitmap */
387 if (!(block->hdr.bitmap[slot / 8] &
388 (1 << (slot % 8)))) {
389 _debug("ENT[%x]: Unused", base + slot);
390 next = slot + 1;
391 if (next >= pos)
392 ctx->pos = (base + next) * sizeof(union afs_xdr_dirent);
393 continue;
394 }
395
396 /* got a valid entry */
397 dire = &block->dirents[slot];
398 nlen = strnlen(dire->u.name,
399 (unsigned long)(block + 1) - (unsigned long)dire->u.name - 1);
400 if (nlen > AFSNAMEMAX - 1) {
401 _debug("ENT[%x]: Name too long (len %zx)",
402 base + slot, nlen);
403 return afs_bad(dvnode, afs_file_error_dir_name_too_long);
404 }
405
406 _debug("ENT[%x]: %s %zx \"%s\"",
407 base + slot, (slot < pos ? "skip" : "fill"),
408 nlen, dire->u.name);
409
410 nr_slots = afs_dir_calc_slots(nlen);
411 next = slot + nr_slots;
412 if (next > AFS_DIR_SLOTS_PER_BLOCK) {
413 _debug("ENT[%x]: extends beyond end dir block (len %zx)",
414 base + slot, nlen);
415 return afs_bad(dvnode, afs_file_error_dir_over_end);
416 }
417
418 /* Check that the name-extension dirents are all allocated */
419 for (tmp = 1; tmp < nr_slots; tmp++) {
420 unsigned int xslot = slot + tmp;
421
422 if (!(block->hdr.bitmap[xslot / 8] & (1 << (xslot % 8)))) {
423 _debug("ENT[%x]: Unmarked extension (%x/%x)",
424 base + slot, tmp, nr_slots);
425 return afs_bad(dvnode, afs_file_error_dir_unmarked_ext);
426 }
427 }
428
429 /* skip if starts before the current position */
430 if (slot < pos) {
431 if (next > pos)
432 ctx->pos = (base + next) * sizeof(union afs_xdr_dirent);
433 continue;
434 }
435
436 /* found the next entry */
437 if (!dir_emit(ctx, dire->u.name, nlen,
438 ntohl(dire->u.vnode),
439 (ctx->actor == afs_lookup_filldir ||
440 ctx->actor == afs_lookup_one_filldir)?
441 ntohl(dire->u.unique) : DT_UNKNOWN)) {
442 _leave(" = 0 [full]");
443 return 0;
444 }
445
446 ctx->pos = (base + next) * sizeof(union afs_xdr_dirent);
447 }
448
449 _leave(" = 1 [more]");
450 return 1;
451 }
452
453 struct afs_dir_iteration_ctx {
454 struct dir_context *dir_ctx;
455 int error;
456 };
457
458 /*
459 * Iterate through a kmapped directory segment.
460 */
afs_dir_iterate_step(void * iter_base,size_t progress,size_t len,void * priv,void * priv2)461 static size_t afs_dir_iterate_step(void *iter_base, size_t progress, size_t len,
462 void *priv, void *priv2)
463 {
464 struct afs_dir_iteration_ctx *ctx = priv2;
465 struct afs_vnode *dvnode = priv;
466 int ret;
467
468 if (WARN_ON_ONCE(progress % AFS_DIR_BLOCK_SIZE ||
469 len % AFS_DIR_BLOCK_SIZE)) {
470 pr_err("Mis-iteration prog=%zx len=%zx\n",
471 progress % AFS_DIR_BLOCK_SIZE,
472 len % AFS_DIR_BLOCK_SIZE);
473 return len;
474 }
475
476 do {
477 ret = afs_dir_iterate_block(dvnode, ctx->dir_ctx, iter_base);
478 if (ret != 1)
479 break;
480
481 ctx->dir_ctx->pos = round_up(ctx->dir_ctx->pos, AFS_DIR_BLOCK_SIZE);
482 iter_base += AFS_DIR_BLOCK_SIZE;
483 len -= AFS_DIR_BLOCK_SIZE;
484 } while (len > 0);
485
486 return len;
487 }
488
489 /*
490 * Iterate through the directory folios.
491 */
afs_dir_iterate_contents(struct inode * dir,struct dir_context * dir_ctx)492 static int afs_dir_iterate_contents(struct inode *dir, struct dir_context *dir_ctx)
493 {
494 struct afs_dir_iteration_ctx ctx = { .dir_ctx = dir_ctx };
495 struct afs_vnode *dvnode = AFS_FS_I(dir);
496 struct iov_iter iter;
497 unsigned long long i_size = i_size_read(dir);
498
499 /* Round the file position up to the next entry boundary */
500 dir_ctx->pos = round_up(dir_ctx->pos, sizeof(union afs_xdr_dirent));
501
502 if (i_size <= 0 || dir_ctx->pos >= i_size)
503 return 0;
504
505 iov_iter_folio_queue(&iter, ITER_SOURCE, dvnode->directory, 0, 0, i_size);
506 iov_iter_advance(&iter, round_down(dir_ctx->pos, AFS_DIR_BLOCK_SIZE));
507
508 iterate_folioq(&iter, iov_iter_count(&iter), dvnode, &ctx,
509 afs_dir_iterate_step);
510
511 if (ctx.error == -ESTALE)
512 afs_invalidate_dir(dvnode, afs_dir_invalid_iter_stale);
513 return ctx.error;
514 }
515
516 /*
517 * iterate through the data blob that lists the contents of an AFS directory
518 */
afs_dir_iterate(struct inode * dir,struct dir_context * ctx,struct file * file,afs_dataversion_t * _dir_version)519 static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx,
520 struct file *file, afs_dataversion_t *_dir_version)
521 {
522 struct afs_vnode *dvnode = AFS_FS_I(dir);
523 int retry_limit = 100;
524 int ret;
525
526 _enter("{%lu},%llx,,", dir->i_ino, ctx->pos);
527
528 do {
529 if (--retry_limit < 0) {
530 pr_warn("afs_read_dir(): Too many retries\n");
531 ret = -ESTALE;
532 break;
533 }
534 ret = afs_read_dir(dvnode, file);
535 if (ret < 0) {
536 if (ret != -ESTALE)
537 break;
538 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) {
539 ret = -ESTALE;
540 break;
541 }
542 continue;
543 }
544 *_dir_version = inode_peek_iversion_raw(dir);
545
546 ret = afs_dir_iterate_contents(dir, ctx);
547 up_read(&dvnode->validate_lock);
548 } while (ret == -ESTALE);
549
550 _leave(" = %d", ret);
551 return ret;
552 }
553
554 /*
555 * read an AFS directory
556 */
afs_readdir(struct file * file,struct dir_context * ctx)557 static int afs_readdir(struct file *file, struct dir_context *ctx)
558 {
559 afs_dataversion_t dir_version;
560
561 return afs_dir_iterate(file_inode(file), ctx, file, &dir_version);
562 }
563
564 /*
565 * Search the directory for a single name
566 * - if afs_dir_iterate_block() spots this function, it'll pass the FID
567 * uniquifier through dtype
568 */
afs_lookup_one_filldir(struct dir_context * ctx,const char * name,int nlen,loff_t fpos,u64 ino,unsigned dtype)569 static bool afs_lookup_one_filldir(struct dir_context *ctx, const char *name,
570 int nlen, loff_t fpos, u64 ino, unsigned dtype)
571 {
572 struct afs_lookup_one_cookie *cookie =
573 container_of(ctx, struct afs_lookup_one_cookie, ctx);
574
575 _enter("{%s,%u},%s,%u,,%llu,%u",
576 cookie->name.name, cookie->name.len, name, nlen,
577 (unsigned long long) ino, dtype);
578
579 /* insanity checks first */
580 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
581 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
582
583 if (cookie->name.len != nlen ||
584 memcmp(cookie->name.name, name, nlen) != 0) {
585 _leave(" = true [keep looking]");
586 return true;
587 }
588
589 cookie->fid.vnode = ino;
590 cookie->fid.unique = dtype;
591 cookie->found = 1;
592
593 _leave(" = false [found]");
594 return false;
595 }
596
597 /*
598 * Do a lookup of a single name in a directory
599 * - just returns the FID the dentry name maps to if found
600 */
afs_do_lookup_one(struct inode * dir,const struct qstr * name,struct afs_fid * fid,afs_dataversion_t * _dir_version)601 static int afs_do_lookup_one(struct inode *dir, const struct qstr *name,
602 struct afs_fid *fid,
603 afs_dataversion_t *_dir_version)
604 {
605 struct afs_super_info *as = dir->i_sb->s_fs_info;
606 struct afs_lookup_one_cookie cookie = {
607 .ctx.actor = afs_lookup_one_filldir,
608 .name = *name,
609 .fid.vid = as->volume->vid
610 };
611 int ret;
612
613 _enter("{%lu},{%.*s},", dir->i_ino, name->len, name->name);
614
615 /* search the directory */
616 ret = afs_dir_iterate(dir, &cookie.ctx, NULL, _dir_version);
617 if (ret < 0) {
618 _leave(" = %d [iter]", ret);
619 return ret;
620 }
621
622 if (!cookie.found) {
623 _leave(" = -ENOENT [not found]");
624 return -ENOENT;
625 }
626
627 *fid = cookie.fid;
628 _leave(" = 0 { vn=%llu u=%u }", fid->vnode, fid->unique);
629 return 0;
630 }
631
632 /*
633 * search the directory for a name
634 * - if afs_dir_iterate_block() spots this function, it'll pass the FID
635 * uniquifier through dtype
636 */
afs_lookup_filldir(struct dir_context * ctx,const char * name,int nlen,loff_t fpos,u64 ino,unsigned dtype)637 static bool afs_lookup_filldir(struct dir_context *ctx, const char *name,
638 int nlen, loff_t fpos, u64 ino, unsigned dtype)
639 {
640 struct afs_lookup_cookie *cookie =
641 container_of(ctx, struct afs_lookup_cookie, ctx);
642
643 _enter("{%s,%u},%s,%u,,%llu,%u",
644 cookie->name.name, cookie->name.len, name, nlen,
645 (unsigned long long) ino, dtype);
646
647 /* insanity checks first */
648 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
649 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
650
651 if (cookie->nr_fids < 50) {
652 cookie->fids[cookie->nr_fids].vnode = ino;
653 cookie->fids[cookie->nr_fids].unique = dtype;
654 cookie->nr_fids++;
655 }
656
657 return cookie->nr_fids < 50;
658 }
659
660 /*
661 * Deal with the result of a successful lookup operation. Turn all the files
662 * into inodes and save the first one - which is the one we actually want.
663 */
afs_do_lookup_success(struct afs_operation * op)664 static void afs_do_lookup_success(struct afs_operation *op)
665 {
666 struct afs_vnode_param *vp;
667 struct afs_vnode *vnode;
668 struct inode *inode;
669 u32 abort_code;
670 int i;
671
672 _enter("");
673
674 for (i = 0; i < op->nr_files; i++) {
675 switch (i) {
676 case 0:
677 vp = &op->file[0];
678 abort_code = vp->scb.status.abort_code;
679 if (abort_code != 0) {
680 op->call_abort_code = abort_code;
681 afs_op_set_error(op, afs_abort_to_error(abort_code));
682 op->cumul_error.abort_code = abort_code;
683 }
684 break;
685
686 case 1:
687 vp = &op->file[1];
688 break;
689
690 default:
691 vp = &op->more_files[i - 2];
692 break;
693 }
694
695 if (vp->scb.status.abort_code)
696 trace_afs_bulkstat_error(op, &vp->fid, i, vp->scb.status.abort_code);
697 if (!vp->scb.have_status && !vp->scb.have_error)
698 continue;
699
700 _debug("do [%u]", i);
701 if (vp->vnode) {
702 if (!test_bit(AFS_VNODE_UNSET, &vp->vnode->flags))
703 afs_vnode_commit_status(op, vp);
704 } else if (vp->scb.status.abort_code == 0) {
705 inode = afs_iget(op, vp);
706 if (!IS_ERR(inode)) {
707 vnode = AFS_FS_I(inode);
708 afs_cache_permit(vnode, op->key,
709 0 /* Assume vnode->cb_break is 0 */ +
710 op->cb_v_break,
711 &vp->scb);
712 vp->vnode = vnode;
713 vp->put_vnode = true;
714 }
715 } else {
716 _debug("- abort %d %llx:%llx.%x",
717 vp->scb.status.abort_code,
718 vp->fid.vid, vp->fid.vnode, vp->fid.unique);
719 }
720 }
721
722 _leave("");
723 }
724
725 static const struct afs_operation_ops afs_inline_bulk_status_operation = {
726 .issue_afs_rpc = afs_fs_inline_bulk_status,
727 .issue_yfs_rpc = yfs_fs_inline_bulk_status,
728 .success = afs_do_lookup_success,
729 };
730
731 static const struct afs_operation_ops afs_lookup_fetch_status_operation = {
732 .issue_afs_rpc = afs_fs_fetch_status,
733 .issue_yfs_rpc = yfs_fs_fetch_status,
734 .success = afs_do_lookup_success,
735 .aborted = afs_check_for_remote_deletion,
736 };
737
738 /*
739 * See if we know that the server we expect to use doesn't support
740 * FS.InlineBulkStatus.
741 */
afs_server_supports_ibulk(struct afs_vnode * dvnode)742 static bool afs_server_supports_ibulk(struct afs_vnode *dvnode)
743 {
744 struct afs_server_list *slist;
745 struct afs_volume *volume = dvnode->volume;
746 struct afs_server *server;
747 bool ret = true;
748 int i;
749
750 if (!test_bit(AFS_VOLUME_MAYBE_NO_IBULK, &volume->flags))
751 return true;
752
753 rcu_read_lock();
754 slist = rcu_dereference(volume->servers);
755
756 for (i = 0; i < slist->nr_servers; i++) {
757 server = slist->servers[i].server;
758 if (server == dvnode->cb_server) {
759 if (test_bit(AFS_SERVER_FL_NO_IBULK, &server->flags))
760 ret = false;
761 break;
762 }
763 }
764
765 rcu_read_unlock();
766 return ret;
767 }
768
769 /*
770 * Do a lookup in a directory. We make use of bulk lookup to query a slew of
771 * files in one go and create inodes for them. The inode of the file we were
772 * asked for is returned.
773 */
afs_do_lookup(struct inode * dir,struct dentry * dentry)774 static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry)
775 {
776 struct afs_lookup_cookie *cookie;
777 struct afs_vnode_param *vp;
778 struct afs_operation *op;
779 struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode;
780 struct inode *inode = NULL, *ti;
781 afs_dataversion_t data_version = READ_ONCE(dvnode->status.data_version);
782 bool supports_ibulk, isnew;
783 long ret;
784 int i;
785
786 _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry);
787
788 cookie = kzalloc_obj(struct afs_lookup_cookie);
789 if (!cookie)
790 return ERR_PTR(-ENOMEM);
791
792 for (i = 0; i < ARRAY_SIZE(cookie->fids); i++)
793 cookie->fids[i].vid = dvnode->fid.vid;
794 cookie->ctx.actor = afs_lookup_filldir;
795 cookie->name = dentry->d_name;
796 cookie->nr_fids = 2; /* slot 1 is saved for the fid we actually want
797 * and slot 0 for the directory */
798
799 /* Search the directory for the named entry using the hash table... */
800 ret = afs_dir_search(dvnode, &dentry->d_name, &cookie->fids[1], &data_version);
801 if (ret < 0)
802 goto out;
803
804 supports_ibulk = afs_server_supports_ibulk(dvnode);
805 if (supports_ibulk) {
806 /* ...then scan linearly from that point for entries to lookup-ahead. */
807 cookie->ctx.pos = (ret + 1) * AFS_DIR_DIRENT_SIZE;
808 afs_dir_iterate(dir, &cookie->ctx, NULL, &data_version);
809 }
810
811 dentry->d_fsdata = (void *)(unsigned long)data_version;
812
813 /* Check to see if we already have an inode for the primary fid. */
814 inode = ilookup5(dir->i_sb, cookie->fids[1].vnode,
815 afs_ilookup5_test_by_fid, &cookie->fids[1]);
816 if (inode)
817 goto out; /* We do */
818
819 /* Okay, we didn't find it. We need to query the server - and whilst
820 * we're doing that, we're going to attempt to look up a bunch of other
821 * vnodes also.
822 */
823 op = afs_alloc_operation(NULL, dvnode->volume);
824 if (IS_ERR(op)) {
825 ret = PTR_ERR(op);
826 goto out;
827 }
828
829 afs_op_set_vnode(op, 0, dvnode);
830 afs_op_set_fid(op, 1, &cookie->fids[1]);
831
832 op->nr_files = cookie->nr_fids;
833 _debug("nr_files %u", op->nr_files);
834
835 /* Need space for examining all the selected files */
836 if (op->nr_files > 2) {
837 op->more_files = kvzalloc_objs(struct afs_vnode_param,
838 op->nr_files - 2);
839 if (!op->more_files) {
840 afs_op_nomem(op);
841 goto out_op;
842 }
843
844 for (i = 2; i < op->nr_files; i++) {
845 vp = &op->more_files[i - 2];
846 vp->fid = cookie->fids[i];
847
848 /* Find any inodes that already exist and get their
849 * callback counters.
850 */
851 ti = ilookup5_nowait(dir->i_sb, vp->fid.vnode,
852 afs_ilookup5_test_by_fid, &vp->fid, &isnew);
853 if (!IS_ERR_OR_NULL(ti)) {
854 vnode = AFS_FS_I(ti);
855 vp->dv_before = vnode->status.data_version;
856 vp->cb_break_before = afs_calc_vnode_cb_break(vnode);
857 vp->vnode = vnode;
858 vp->put_vnode = true;
859 vp->speculative = true; /* vnode not locked */
860 }
861 }
862 }
863
864 /* Try FS.InlineBulkStatus first. Abort codes for the individual
865 * lookups contained therein are stored in the reply without aborting
866 * the whole operation.
867 */
868 afs_op_set_error(op, -ENOTSUPP);
869 if (supports_ibulk) {
870 op->ops = &afs_inline_bulk_status_operation;
871 afs_begin_vnode_operation(op);
872 afs_wait_for_operation(op);
873 }
874
875 if (afs_op_error(op) == -ENOTSUPP) {
876 /* We could try FS.BulkStatus next, but this aborts the entire
877 * op if any of the lookups fails - so, for the moment, revert
878 * to FS.FetchStatus for op->file[1].
879 */
880 op->fetch_status.which = 1;
881 op->ops = &afs_lookup_fetch_status_operation;
882 afs_begin_vnode_operation(op);
883 afs_wait_for_operation(op);
884 }
885
886 out_op:
887 if (!afs_op_error(op)) {
888 if (op->file[1].scb.status.abort_code) {
889 afs_op_accumulate_error(op, -ECONNABORTED,
890 op->file[1].scb.status.abort_code);
891 } else {
892 inode = &op->file[1].vnode->netfs.inode;
893 op->file[1].vnode = NULL;
894 }
895 }
896
897 if (op->file[0].scb.have_status)
898 dentry->d_fsdata = (void *)(unsigned long)op->file[0].scb.status.data_version;
899 else
900 dentry->d_fsdata = (void *)(unsigned long)op->file[0].dv_before;
901 ret = afs_put_operation(op);
902 out:
903 kfree(cookie);
904 _leave("");
905 return inode ?: ERR_PTR(ret);
906 }
907
908 /*
909 * Look up an entry in a directory with @sys substitution.
910 */
afs_lookup_atsys(struct inode * dir,struct dentry * dentry)911 static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry)
912 {
913 struct afs_sysnames *subs;
914 struct afs_net *net = afs_i2net(dir);
915 struct dentry *ret;
916 char *buf, *p, *name;
917 int len, i;
918
919 _enter("");
920
921 ret = ERR_PTR(-ENOMEM);
922 p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL);
923 if (!buf)
924 goto out_p;
925 if (dentry->d_name.len > 4) {
926 memcpy(p, dentry->d_name.name, dentry->d_name.len - 4);
927 p += dentry->d_name.len - 4;
928 }
929
930 /* There is an ordered list of substitutes that we have to try. */
931 read_lock(&net->sysnames_lock);
932 subs = net->sysnames;
933 refcount_inc(&subs->usage);
934 read_unlock(&net->sysnames_lock);
935
936 for (i = 0; i < subs->nr; i++) {
937 name = subs->subs[i];
938 len = dentry->d_name.len - 4 + strlen(name);
939 if (len >= AFSNAMEMAX) {
940 ret = ERR_PTR(-ENAMETOOLONG);
941 goto out_s;
942 }
943
944 strcpy(p, name);
945 ret = lookup_noperm(&QSTR(buf), dentry->d_parent);
946 if (IS_ERR(ret) || d_is_positive(ret))
947 goto out_s;
948 dput(ret);
949 }
950
951 /* We don't want to d_add() the @sys dentry here as we don't want to
952 * the cached dentry to hide changes to the sysnames list.
953 */
954 ret = NULL;
955 out_s:
956 afs_put_sysnames(subs);
957 kfree(buf);
958 out_p:
959 return ret;
960 }
961
962 /*
963 * look up an entry in a directory
964 */
afs_lookup(struct inode * dir,struct dentry * dentry,unsigned int flags)965 static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
966 unsigned int flags)
967 {
968 struct afs_vnode *dvnode = AFS_FS_I(dir);
969 struct afs_fid fid = {};
970 struct inode *inode;
971 struct dentry *d;
972 int ret;
973
974 _enter("{%llx:%llu},%p{%pd},",
975 dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry);
976
977 ASSERTCMP(d_inode(dentry), ==, NULL);
978
979 if (dentry->d_name.len >= AFSNAMEMAX) {
980 _leave(" = -ENAMETOOLONG");
981 return ERR_PTR(-ENAMETOOLONG);
982 }
983
984 if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) {
985 _leave(" = -ESTALE");
986 return ERR_PTR(-ESTALE);
987 }
988
989 ret = afs_validate(dvnode, NULL);
990 if (ret < 0) {
991 afs_dir_unuse_cookie(dvnode, ret);
992 _leave(" = %d [val]", ret);
993 return ERR_PTR(ret);
994 }
995
996 if (dentry->d_name.len >= 4 &&
997 dentry->d_name.name[dentry->d_name.len - 4] == '@' &&
998 dentry->d_name.name[dentry->d_name.len - 3] == 's' &&
999 dentry->d_name.name[dentry->d_name.len - 2] == 'y' &&
1000 dentry->d_name.name[dentry->d_name.len - 1] == 's')
1001 return afs_lookup_atsys(dir, dentry);
1002
1003 afs_stat_v(dvnode, n_lookup);
1004 inode = afs_do_lookup(dir, dentry);
1005 if (inode == ERR_PTR(-ENOENT))
1006 inode = NULL;
1007 else if (!IS_ERR_OR_NULL(inode))
1008 fid = AFS_FS_I(inode)->fid;
1009
1010 _debug("splice %p", dentry->d_inode);
1011 d = d_splice_alias(inode, dentry);
1012 if (!IS_ERR_OR_NULL(d)) {
1013 d->d_fsdata = dentry->d_fsdata;
1014 trace_afs_lookup(dvnode, &d->d_name, &fid);
1015 } else {
1016 trace_afs_lookup(dvnode, &dentry->d_name, &fid);
1017 }
1018 _leave("");
1019 return d;
1020 }
1021
1022 /*
1023 * Check the validity of a dentry under RCU conditions.
1024 */
afs_d_revalidate_rcu(struct afs_vnode * dvnode,struct dentry * dentry)1025 static int afs_d_revalidate_rcu(struct afs_vnode *dvnode, struct dentry *dentry)
1026 {
1027 long dir_version, de_version;
1028
1029 _enter("%p", dentry);
1030
1031 if (test_bit(AFS_VNODE_DELETED, &dvnode->flags))
1032 return -ECHILD;
1033
1034 if (!afs_check_validity(dvnode))
1035 return -ECHILD;
1036
1037 /* We only need to invalidate a dentry if the server's copy changed
1038 * behind our back. If we made the change, it's no problem. Note that
1039 * on a 32-bit system, we only have 32 bits in the dentry to store the
1040 * version.
1041 */
1042 dir_version = (long)READ_ONCE(dvnode->status.data_version);
1043 de_version = (long)READ_ONCE(dentry->d_fsdata);
1044 if (de_version != dir_version) {
1045 dir_version = (long)READ_ONCE(dvnode->invalid_before);
1046 if (de_version - dir_version < 0)
1047 return -ECHILD;
1048 }
1049
1050 return 1; /* Still valid */
1051 }
1052
1053 /*
1054 * check that a dentry lookup hit has found a valid entry
1055 * - NOTE! the hit can be a negative hit too, so we can't assume we have an
1056 * inode
1057 */
afs_d_revalidate(struct inode * parent_dir,const struct qstr * name,struct dentry * dentry,unsigned int flags)1058 static int afs_d_revalidate(struct inode *parent_dir, const struct qstr *name,
1059 struct dentry *dentry, unsigned int flags)
1060 {
1061 struct afs_vnode *vnode, *dir = AFS_FS_I(parent_dir);
1062 struct afs_fid fid;
1063 struct inode *inode;
1064 struct key *key;
1065 afs_dataversion_t dir_version, invalid_before;
1066 long de_version;
1067 int ret;
1068
1069 if (flags & LOOKUP_RCU)
1070 return afs_d_revalidate_rcu(dir, dentry);
1071
1072 if (d_really_is_positive(dentry)) {
1073 vnode = AFS_FS_I(d_inode(dentry));
1074 _enter("{v={%llx:%llu} n=%pd fl=%lx},",
1075 vnode->fid.vid, vnode->fid.vnode, dentry,
1076 vnode->flags);
1077 } else {
1078 _enter("{neg n=%pd}", dentry);
1079 }
1080
1081 key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell);
1082 if (IS_ERR(key))
1083 key = NULL;
1084
1085 /* validate the parent directory */
1086 ret = afs_validate(dir, key);
1087 if (ret == -ERESTARTSYS) {
1088 key_put(key);
1089 return ret;
1090 }
1091
1092 if (test_bit(AFS_VNODE_DELETED, &dir->flags)) {
1093 _debug("%pd: parent dir deleted", dentry);
1094 goto not_found;
1095 }
1096
1097 /* We only need to invalidate a dentry if the server's copy changed
1098 * behind our back. If we made the change, it's no problem. Note that
1099 * on a 32-bit system, we only have 32 bits in the dentry to store the
1100 * version.
1101 */
1102 dir_version = dir->status.data_version;
1103 de_version = (long)dentry->d_fsdata;
1104 if (de_version == (long)dir_version)
1105 goto out_valid_noupdate;
1106
1107 invalid_before = dir->invalid_before;
1108 if (de_version - (long)invalid_before >= 0)
1109 goto out_valid;
1110
1111 _debug("dir modified");
1112 afs_stat_v(dir, n_reval);
1113
1114 /* search the directory for this vnode */
1115 ret = afs_do_lookup_one(&dir->netfs.inode, name, &fid, &dir_version);
1116 switch (ret) {
1117 case 0:
1118 /* the filename maps to something */
1119 if (d_really_is_negative(dentry))
1120 goto not_found;
1121 inode = d_inode(dentry);
1122 if (is_bad_inode(inode)) {
1123 printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n",
1124 dentry);
1125 goto not_found;
1126 }
1127
1128 vnode = AFS_FS_I(inode);
1129
1130 /* if the vnode ID has changed, then the dirent points to a
1131 * different file */
1132 if (fid.vnode != vnode->fid.vnode) {
1133 _debug("%pd: dirent changed [%llu != %llu]",
1134 dentry, fid.vnode,
1135 vnode->fid.vnode);
1136 goto not_found;
1137 }
1138
1139 /* if the vnode ID uniqifier has changed, then the file has
1140 * been deleted and replaced, and the original vnode ID has
1141 * been reused */
1142 if (fid.unique != vnode->fid.unique) {
1143 _debug("%pd: file deleted (uq %u -> %u I:%u)",
1144 dentry, fid.unique,
1145 vnode->fid.unique,
1146 vnode->netfs.inode.i_generation);
1147 goto not_found;
1148 }
1149 goto out_valid;
1150
1151 case -ENOENT:
1152 /* the filename is unknown */
1153 _debug("%pd: dirent not found", dentry);
1154 if (d_really_is_positive(dentry))
1155 goto not_found;
1156 goto out_valid;
1157
1158 default:
1159 _debug("failed to iterate parent %pd2: %d", dentry, ret);
1160 goto not_found;
1161 }
1162
1163 out_valid:
1164 dentry->d_fsdata = (void *)(unsigned long)dir_version;
1165 out_valid_noupdate:
1166 key_put(key);
1167 _leave(" = 1 [valid]");
1168 return 1;
1169
1170 not_found:
1171 _debug("dropping dentry %pd2", dentry);
1172 key_put(key);
1173
1174 _leave(" = 0 [bad]");
1175 return 0;
1176 }
1177
1178 /*
1179 * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't
1180 * sleep)
1181 * - called from dput() when d_count is going to 0.
1182 * - return 1 to request dentry be unhashed, 0 otherwise
1183 */
afs_d_delete(const struct dentry * dentry)1184 static int afs_d_delete(const struct dentry *dentry)
1185 {
1186 _enter("%pd", dentry);
1187
1188 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
1189 goto zap;
1190
1191 if (d_really_is_positive(dentry) &&
1192 (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) ||
1193 test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags)))
1194 goto zap;
1195
1196 _leave(" = 0 [keep]");
1197 return 0;
1198
1199 zap:
1200 _leave(" = 1 [zap]");
1201 return 1;
1202 }
1203
1204 /*
1205 * Clean up sillyrename files on dentry removal.
1206 */
afs_d_iput(struct dentry * dentry,struct inode * inode)1207 static void afs_d_iput(struct dentry *dentry, struct inode *inode)
1208 {
1209 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
1210 afs_silly_iput(dentry, inode);
1211 iput(inode);
1212 }
1213
1214 /*
1215 * handle dentry release
1216 */
afs_d_release(struct dentry * dentry)1217 void afs_d_release(struct dentry *dentry)
1218 {
1219 _enter("%pd", dentry);
1220 }
1221
afs_check_for_remote_deletion(struct afs_operation * op)1222 void afs_check_for_remote_deletion(struct afs_operation *op)
1223 {
1224 struct afs_vnode *vnode = op->file[0].vnode;
1225
1226 switch (afs_op_abort_code(op)) {
1227 case VNOVNODE:
1228 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1229 clear_nlink(&vnode->netfs.inode);
1230 afs_break_callback(vnode, afs_cb_break_for_deleted);
1231 }
1232 }
1233
1234 /*
1235 * Create a new inode for create/mkdir/symlink
1236 */
afs_vnode_new_inode(struct afs_operation * op)1237 static void afs_vnode_new_inode(struct afs_operation *op)
1238 {
1239 struct afs_vnode_param *dvp = &op->file[0];
1240 struct afs_vnode_param *vp = &op->file[1];
1241 struct afs_vnode *vnode;
1242 struct inode *inode;
1243
1244 _enter("");
1245
1246 ASSERTCMP(afs_op_error(op), ==, 0);
1247
1248 inode = afs_iget(op, vp);
1249 if (IS_ERR(inode)) {
1250 /* ENOMEM or EINTR at a really inconvenient time - just abandon
1251 * the new directory on the server.
1252 */
1253 afs_op_accumulate_error(op, PTR_ERR(inode), 0);
1254 return;
1255 }
1256
1257 vnode = AFS_FS_I(inode);
1258 set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags);
1259 if (S_ISDIR(inode->i_mode))
1260 afs_mkdir_init_dir(vnode, dvp->vnode);
1261 else if (S_ISLNK(inode->i_mode))
1262 afs_init_new_symlink(vnode, op);
1263 if (!afs_op_error(op))
1264 afs_cache_permit(vnode, op->key, vnode->cb_break, &vp->scb);
1265 d_instantiate(op->dentry, inode);
1266 }
1267
afs_create_success(struct afs_operation * op)1268 static void afs_create_success(struct afs_operation *op)
1269 {
1270 _enter("op=%08x", op->debug_id);
1271 op->ctime = op->file[0].scb.status.mtime_client;
1272 afs_vnode_commit_status(op, &op->file[0]);
1273 afs_update_dentry_version(op, &op->file[0], op->dentry);
1274 afs_vnode_new_inode(op);
1275 }
1276
afs_create_edit_dir(struct afs_operation * op)1277 static void afs_create_edit_dir(struct afs_operation *op)
1278 {
1279 struct netfs_cache_resources cres = {};
1280 struct afs_vnode_param *dvp = &op->file[0];
1281 struct afs_vnode_param *vp = &op->file[1];
1282 struct afs_vnode *dvnode = dvp->vnode;
1283
1284 _enter("op=%08x", op->debug_id);
1285
1286 fscache_begin_write_operation(&cres, afs_vnode_cache(dvnode));
1287 down_write(&dvnode->validate_lock);
1288 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
1289 dvnode->status.data_version == dvp->dv_before + dvp->dv_delta)
1290 afs_edit_dir_add(dvnode, &op->dentry->d_name, &vp->fid,
1291 op->create.reason);
1292 up_write(&dvnode->validate_lock);
1293 fscache_end_operation(&cres);
1294 }
1295
afs_create_put(struct afs_operation * op)1296 static void afs_create_put(struct afs_operation *op)
1297 {
1298 _enter("op=%08x", op->debug_id);
1299
1300 if (afs_op_error(op))
1301 d_drop(op->dentry);
1302 }
1303
1304 static const struct afs_operation_ops afs_mkdir_operation = {
1305 .issue_afs_rpc = afs_fs_make_dir,
1306 .issue_yfs_rpc = yfs_fs_make_dir,
1307 .success = afs_create_success,
1308 .aborted = afs_check_for_remote_deletion,
1309 .edit_dir = afs_create_edit_dir,
1310 .put = afs_create_put,
1311 };
1312
1313 /*
1314 * create a directory on an AFS filesystem
1315 */
afs_mkdir(struct mnt_idmap * idmap,struct inode * dir,struct dentry * dentry,umode_t mode)1316 static struct dentry *afs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
1317 struct dentry *dentry, umode_t mode)
1318 {
1319 struct afs_operation *op;
1320 struct afs_vnode *dvnode = AFS_FS_I(dir);
1321 int ret;
1322
1323 _enter("{%llx:%llu},{%pd},%ho",
1324 dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
1325
1326 op = afs_alloc_operation(NULL, dvnode->volume);
1327 if (IS_ERR(op)) {
1328 d_drop(dentry);
1329 return ERR_CAST(op);
1330 }
1331
1332 fscache_use_cookie(afs_vnode_cache(dvnode), true);
1333
1334 afs_op_set_vnode(op, 0, dvnode);
1335 op->file[0].dv_delta = 1;
1336 op->file[0].modification = true;
1337 op->file[0].update_ctime = true;
1338 op->dentry = dentry;
1339 op->create.mode = S_IFDIR | mode;
1340 op->create.reason = afs_edit_dir_for_mkdir;
1341 op->mtime = current_time(dir);
1342 op->ops = &afs_mkdir_operation;
1343 ret = afs_do_sync_operation(op);
1344 afs_dir_unuse_cookie(dvnode, ret);
1345 return ERR_PTR(ret);
1346 }
1347
1348 /*
1349 * Remove a subdir from a directory.
1350 */
afs_dir_remove_subdir(struct dentry * dentry)1351 static void afs_dir_remove_subdir(struct dentry *dentry)
1352 {
1353 if (d_really_is_positive(dentry)) {
1354 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
1355
1356 clear_nlink(&vnode->netfs.inode);
1357 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1358 afs_clear_cb_promise(vnode, afs_cb_promise_clear_rmdir);
1359 afs_invalidate_dir(vnode, afs_dir_invalid_subdir_removed);
1360 }
1361 }
1362
afs_rmdir_success(struct afs_operation * op)1363 static void afs_rmdir_success(struct afs_operation *op)
1364 {
1365 _enter("op=%08x", op->debug_id);
1366 op->ctime = op->file[0].scb.status.mtime_client;
1367 afs_vnode_commit_status(op, &op->file[0]);
1368 afs_update_dentry_version(op, &op->file[0], op->dentry);
1369 }
1370
afs_rmdir_edit_dir(struct afs_operation * op)1371 static void afs_rmdir_edit_dir(struct afs_operation *op)
1372 {
1373 struct netfs_cache_resources cres = {};
1374 struct afs_vnode_param *dvp = &op->file[0];
1375 struct afs_vnode *dvnode = dvp->vnode;
1376
1377 _enter("op=%08x", op->debug_id);
1378 afs_dir_remove_subdir(op->dentry);
1379
1380 fscache_begin_write_operation(&cres, afs_vnode_cache(dvnode));
1381 down_write(&dvnode->validate_lock);
1382 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
1383 dvnode->status.data_version == dvp->dv_before + dvp->dv_delta)
1384 afs_edit_dir_remove(dvnode, &op->dentry->d_name,
1385 afs_edit_dir_for_rmdir);
1386 up_write(&dvnode->validate_lock);
1387 fscache_end_operation(&cres);
1388 }
1389
afs_rmdir_put(struct afs_operation * op)1390 static void afs_rmdir_put(struct afs_operation *op)
1391 {
1392 _enter("op=%08x", op->debug_id);
1393 if (op->file[1].vnode)
1394 up_write(&op->file[1].vnode->rmdir_lock);
1395 }
1396
1397 static const struct afs_operation_ops afs_rmdir_operation = {
1398 .issue_afs_rpc = afs_fs_remove_dir,
1399 .issue_yfs_rpc = yfs_fs_remove_dir,
1400 .success = afs_rmdir_success,
1401 .aborted = afs_check_for_remote_deletion,
1402 .edit_dir = afs_rmdir_edit_dir,
1403 .put = afs_rmdir_put,
1404 };
1405
1406 /*
1407 * remove a directory from an AFS filesystem
1408 */
afs_rmdir(struct inode * dir,struct dentry * dentry)1409 static int afs_rmdir(struct inode *dir, struct dentry *dentry)
1410 {
1411 struct afs_operation *op;
1412 struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL;
1413 int ret;
1414
1415 _enter("{%llx:%llu},{%pd}",
1416 dvnode->fid.vid, dvnode->fid.vnode, dentry);
1417
1418 op = afs_alloc_operation(NULL, dvnode->volume);
1419 if (IS_ERR(op))
1420 return PTR_ERR(op);
1421
1422 fscache_use_cookie(afs_vnode_cache(dvnode), true);
1423
1424 afs_op_set_vnode(op, 0, dvnode);
1425 op->file[0].dv_delta = 1;
1426 op->file[0].modification = true;
1427 op->file[0].update_ctime = true;
1428
1429 op->dentry = dentry;
1430 op->ops = &afs_rmdir_operation;
1431
1432 /* Try to make sure we have a callback promise on the victim. */
1433 if (d_really_is_positive(dentry)) {
1434 vnode = AFS_FS_I(d_inode(dentry));
1435 ret = afs_validate(vnode, op->key);
1436 if (ret < 0)
1437 goto error;
1438 }
1439
1440 if (vnode) {
1441 ret = down_write_killable(&vnode->rmdir_lock);
1442 if (ret < 0)
1443 goto error;
1444 op->file[1].vnode = vnode;
1445 }
1446
1447 ret = afs_do_sync_operation(op);
1448
1449 /* Not all systems that can host afs servers have ENOTEMPTY. */
1450 if (ret == -EEXIST)
1451 ret = -ENOTEMPTY;
1452 out:
1453 afs_dir_unuse_cookie(dvnode, ret);
1454 return ret;
1455
1456 error:
1457 ret = afs_put_operation(op);
1458 goto out;
1459 }
1460
1461 /*
1462 * Remove a link to a file or symlink from a directory.
1463 *
1464 * If the file was not deleted due to excess hard links, the fileserver will
1465 * break the callback promise on the file - if it had one - before it returns
1466 * to us, and if it was deleted, it won't
1467 *
1468 * However, if we didn't have a callback promise outstanding, or it was
1469 * outstanding on a different server, then it won't break it either...
1470 */
afs_dir_remove_link(struct afs_operation * op)1471 static void afs_dir_remove_link(struct afs_operation *op)
1472 {
1473 struct afs_vnode *dvnode = op->file[0].vnode;
1474 struct afs_vnode *vnode = op->file[1].vnode;
1475 struct dentry *dentry = op->dentry;
1476 int ret;
1477
1478 if (afs_op_error(op) ||
1479 (op->file[1].scb.have_status && op->file[1].scb.have_error))
1480 return;
1481 if (d_really_is_positive(dentry))
1482 return;
1483
1484 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
1485 /* Already done */
1486 } else if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) {
1487 write_seqlock(&vnode->cb_lock);
1488 drop_nlink(&vnode->netfs.inode);
1489 if (vnode->netfs.inode.i_nlink == 0) {
1490 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1491 __afs_break_callback(vnode, afs_cb_break_for_unlink);
1492 }
1493 write_sequnlock(&vnode->cb_lock);
1494 } else {
1495 afs_break_callback(vnode, afs_cb_break_for_unlink);
1496
1497 if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
1498 _debug("AFS_VNODE_DELETED");
1499
1500 ret = afs_validate(vnode, op->key);
1501 if (ret != -ESTALE)
1502 afs_op_set_error(op, ret);
1503 }
1504
1505 _debug("nlink %d [val %d]", vnode->netfs.inode.i_nlink, afs_op_error(op));
1506 }
1507
afs_unlink_success(struct afs_operation * op)1508 static void afs_unlink_success(struct afs_operation *op)
1509 {
1510 _enter("op=%08x", op->debug_id);
1511 op->ctime = op->file[0].scb.status.mtime_client;
1512 afs_check_dir_conflict(op, &op->file[0]);
1513 afs_vnode_commit_status(op, &op->file[0]);
1514 afs_vnode_commit_status(op, &op->file[1]);
1515 afs_update_dentry_version(op, &op->file[0], op->dentry);
1516 afs_dir_remove_link(op);
1517 }
1518
afs_unlink_edit_dir(struct afs_operation * op)1519 static void afs_unlink_edit_dir(struct afs_operation *op)
1520 {
1521 struct netfs_cache_resources cres = {};
1522 struct afs_vnode_param *dvp = &op->file[0];
1523 struct afs_vnode *dvnode = dvp->vnode;
1524
1525 _enter("op=%08x", op->debug_id);
1526 fscache_begin_write_operation(&cres, afs_vnode_cache(dvnode));
1527 down_write(&dvnode->validate_lock);
1528 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
1529 dvnode->status.data_version == dvp->dv_before + dvp->dv_delta)
1530 afs_edit_dir_remove(dvnode, &op->dentry->d_name,
1531 afs_edit_dir_for_unlink);
1532 up_write(&dvnode->validate_lock);
1533 fscache_end_operation(&cres);
1534 }
1535
afs_unlink_put(struct afs_operation * op)1536 static void afs_unlink_put(struct afs_operation *op)
1537 {
1538 _enter("op=%08x", op->debug_id);
1539 if (op->unlink.need_rehash && afs_op_error(op) < 0 && afs_op_error(op) != -ENOENT)
1540 d_rehash(op->dentry);
1541 }
1542
1543 static const struct afs_operation_ops afs_unlink_operation = {
1544 .issue_afs_rpc = afs_fs_remove_file,
1545 .issue_yfs_rpc = yfs_fs_remove_file,
1546 .success = afs_unlink_success,
1547 .aborted = afs_check_for_remote_deletion,
1548 .edit_dir = afs_unlink_edit_dir,
1549 .put = afs_unlink_put,
1550 };
1551
1552 /*
1553 * Remove a file or symlink from an AFS filesystem.
1554 */
afs_unlink(struct inode * dir,struct dentry * dentry)1555 static int afs_unlink(struct inode *dir, struct dentry *dentry)
1556 {
1557 struct afs_operation *op;
1558 struct afs_vnode *dvnode = AFS_FS_I(dir);
1559 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
1560 int ret;
1561
1562 _enter("{%llx:%llu},{%pd}",
1563 dvnode->fid.vid, dvnode->fid.vnode, dentry);
1564
1565 if (dentry->d_name.len >= AFSNAMEMAX)
1566 return -ENAMETOOLONG;
1567
1568 op = afs_alloc_operation(NULL, dvnode->volume);
1569 if (IS_ERR(op))
1570 return PTR_ERR(op);
1571
1572 fscache_use_cookie(afs_vnode_cache(dvnode), true);
1573
1574 afs_op_set_vnode(op, 0, dvnode);
1575 op->file[0].dv_delta = 1;
1576 op->file[0].modification = true;
1577 op->file[0].update_ctime = true;
1578
1579 /* Try to make sure we have a callback promise on the victim. */
1580 ret = afs_validate(vnode, op->key);
1581 if (ret < 0) {
1582 afs_op_set_error(op, ret);
1583 goto error;
1584 }
1585
1586 spin_lock(&dentry->d_lock);
1587 if (d_count(dentry) > 1) {
1588 spin_unlock(&dentry->d_lock);
1589 /* Start asynchronous writeout of the inode */
1590 write_inode_now(d_inode(dentry), 0);
1591 afs_op_set_error(op, afs_sillyrename(dvnode, vnode, dentry, op->key));
1592 goto error;
1593 }
1594 if (!d_unhashed(dentry)) {
1595 /* Prevent a race with RCU lookup. */
1596 __d_drop(dentry);
1597 op->unlink.need_rehash = true;
1598 }
1599 spin_unlock(&dentry->d_lock);
1600
1601 op->file[1].vnode = vnode;
1602 op->file[1].update_ctime = true;
1603 op->file[1].op_unlinked = true;
1604 op->dentry = dentry;
1605 op->ops = &afs_unlink_operation;
1606 afs_begin_vnode_operation(op);
1607 afs_wait_for_operation(op);
1608
1609 /* If there was a conflict with a third party, check the status of the
1610 * unlinked vnode.
1611 */
1612 if (afs_op_error(op) == 0 && (op->flags & AFS_OPERATION_DIR_CONFLICT)) {
1613 op->file[1].update_ctime = false;
1614 op->fetch_status.which = 1;
1615 op->ops = &afs_fetch_status_operation;
1616 afs_begin_vnode_operation(op);
1617 afs_wait_for_operation(op);
1618 }
1619
1620 error:
1621 ret = afs_put_operation(op);
1622 afs_dir_unuse_cookie(dvnode, ret);
1623 return ret;
1624 }
1625
1626 static const struct afs_operation_ops afs_create_operation = {
1627 .issue_afs_rpc = afs_fs_create_file,
1628 .issue_yfs_rpc = yfs_fs_create_file,
1629 .success = afs_create_success,
1630 .aborted = afs_check_for_remote_deletion,
1631 .edit_dir = afs_create_edit_dir,
1632 .put = afs_create_put,
1633 };
1634
1635 /*
1636 * create a regular file on an AFS filesystem
1637 */
afs_create(struct mnt_idmap * idmap,struct inode * dir,struct dentry * dentry,umode_t mode,bool excl)1638 static int afs_create(struct mnt_idmap *idmap, struct inode *dir,
1639 struct dentry *dentry, umode_t mode, bool excl)
1640 {
1641 struct afs_operation *op;
1642 struct afs_vnode *dvnode = AFS_FS_I(dir);
1643 int ret = -ENAMETOOLONG;
1644
1645 _enter("{%llx:%llu},{%pd},%ho",
1646 dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
1647
1648 if (dentry->d_name.len >= AFSNAMEMAX)
1649 goto error;
1650
1651 op = afs_alloc_operation(NULL, dvnode->volume);
1652 if (IS_ERR(op)) {
1653 ret = PTR_ERR(op);
1654 goto error;
1655 }
1656
1657 fscache_use_cookie(afs_vnode_cache(dvnode), true);
1658
1659 afs_op_set_vnode(op, 0, dvnode);
1660 op->file[0].dv_delta = 1;
1661 op->file[0].modification = true;
1662 op->file[0].update_ctime = true;
1663
1664 op->dentry = dentry;
1665 op->create.mode = S_IFREG | mode;
1666 op->create.reason = afs_edit_dir_for_create;
1667 op->mtime = current_time(dir);
1668 op->ops = &afs_create_operation;
1669 ret = afs_do_sync_operation(op);
1670 afs_dir_unuse_cookie(dvnode, ret);
1671 return ret;
1672
1673 error:
1674 d_drop(dentry);
1675 _leave(" = %d", ret);
1676 return ret;
1677 }
1678
afs_link_success(struct afs_operation * op)1679 static void afs_link_success(struct afs_operation *op)
1680 {
1681 struct afs_vnode_param *dvp = &op->file[0];
1682 struct afs_vnode_param *vp = &op->file[1];
1683
1684 _enter("op=%08x", op->debug_id);
1685 op->ctime = dvp->scb.status.mtime_client;
1686 afs_vnode_commit_status(op, dvp);
1687 afs_vnode_commit_status(op, vp);
1688 afs_update_dentry_version(op, dvp, op->dentry);
1689 if (op->dentry_2->d_parent == op->dentry->d_parent)
1690 afs_update_dentry_version(op, dvp, op->dentry_2);
1691 ihold(&vp->vnode->netfs.inode);
1692 d_instantiate(op->dentry, &vp->vnode->netfs.inode);
1693 }
1694
afs_link_put(struct afs_operation * op)1695 static void afs_link_put(struct afs_operation *op)
1696 {
1697 _enter("op=%08x", op->debug_id);
1698 if (afs_op_error(op))
1699 d_drop(op->dentry);
1700 }
1701
1702 static const struct afs_operation_ops afs_link_operation = {
1703 .issue_afs_rpc = afs_fs_link,
1704 .issue_yfs_rpc = yfs_fs_link,
1705 .success = afs_link_success,
1706 .aborted = afs_check_for_remote_deletion,
1707 .edit_dir = afs_create_edit_dir,
1708 .put = afs_link_put,
1709 };
1710
1711 /*
1712 * create a hard link between files in an AFS filesystem
1713 */
afs_link(struct dentry * from,struct inode * dir,struct dentry * dentry)1714 static int afs_link(struct dentry *from, struct inode *dir,
1715 struct dentry *dentry)
1716 {
1717 struct afs_operation *op;
1718 struct afs_vnode *dvnode = AFS_FS_I(dir);
1719 struct afs_vnode *vnode = AFS_FS_I(d_inode(from));
1720 int ret = -ENAMETOOLONG;
1721
1722 _enter("{%llx:%llu},{%llx:%llu},{%pd}",
1723 vnode->fid.vid, vnode->fid.vnode,
1724 dvnode->fid.vid, dvnode->fid.vnode,
1725 dentry);
1726
1727 if (dentry->d_name.len >= AFSNAMEMAX)
1728 goto error;
1729
1730 op = afs_alloc_operation(NULL, dvnode->volume);
1731 if (IS_ERR(op)) {
1732 ret = PTR_ERR(op);
1733 goto error;
1734 }
1735
1736 fscache_use_cookie(afs_vnode_cache(dvnode), true);
1737
1738 ret = afs_validate(vnode, op->key);
1739 if (ret < 0)
1740 goto error_op;
1741
1742 afs_op_set_vnode(op, 0, dvnode);
1743 afs_op_set_vnode(op, 1, vnode);
1744 op->file[0].dv_delta = 1;
1745 op->file[0].modification = true;
1746 op->file[0].update_ctime = true;
1747 op->file[1].update_ctime = true;
1748
1749 op->dentry = dentry;
1750 op->dentry_2 = from;
1751 op->ops = &afs_link_operation;
1752 op->create.reason = afs_edit_dir_for_link;
1753 ret = afs_do_sync_operation(op);
1754 afs_dir_unuse_cookie(dvnode, ret);
1755 return ret;
1756
1757 error_op:
1758 afs_put_operation(op);
1759 afs_dir_unuse_cookie(dvnode, ret);
1760 error:
1761 d_drop(dentry);
1762 _leave(" = %d", ret);
1763 return ret;
1764 }
1765
1766 static const struct afs_operation_ops afs_symlink_operation = {
1767 .issue_afs_rpc = afs_fs_symlink,
1768 .issue_yfs_rpc = yfs_fs_symlink,
1769 .success = afs_create_success,
1770 .aborted = afs_check_for_remote_deletion,
1771 .edit_dir = afs_create_edit_dir,
1772 .put = afs_create_put,
1773 };
1774
1775 /*
1776 * create a symlink in an AFS filesystem
1777 */
afs_symlink(struct mnt_idmap * idmap,struct inode * dir,struct dentry * dentry,const char * content)1778 static int afs_symlink(struct mnt_idmap *idmap, struct inode *dir,
1779 struct dentry *dentry, const char *content)
1780 {
1781 struct afs_operation *op;
1782 struct afs_vnode *dvnode = AFS_FS_I(dir);
1783 int ret;
1784
1785 _enter("{%llx:%llu},{%pd},%s",
1786 dvnode->fid.vid, dvnode->fid.vnode, dentry,
1787 content);
1788
1789 ret = -ENAMETOOLONG;
1790 if (dentry->d_name.len >= AFSNAMEMAX)
1791 goto error;
1792
1793 ret = -EINVAL;
1794 if (strlen(content) >= AFSPATHMAX)
1795 goto error;
1796
1797 op = afs_alloc_operation(NULL, dvnode->volume);
1798 if (IS_ERR(op)) {
1799 ret = PTR_ERR(op);
1800 goto error;
1801 }
1802
1803 fscache_use_cookie(afs_vnode_cache(dvnode), true);
1804
1805 afs_op_set_vnode(op, 0, dvnode);
1806 op->file[0].dv_delta = 1;
1807
1808 op->dentry = dentry;
1809 op->ops = &afs_symlink_operation;
1810 op->create.reason = afs_edit_dir_for_symlink;
1811 op->create.symlink = content;
1812 op->mtime = current_time(dir);
1813 ret = afs_do_sync_operation(op);
1814 afs_dir_unuse_cookie(dvnode, ret);
1815 return ret;
1816
1817 error:
1818 d_drop(dentry);
1819 _leave(" = %d", ret);
1820 return ret;
1821 }
1822
afs_rename_success(struct afs_operation * op)1823 static void afs_rename_success(struct afs_operation *op)
1824 {
1825 struct afs_vnode *vnode = op->more_files[0].vnode;
1826 struct afs_vnode *new_vnode = op->more_files[1].vnode;
1827
1828 _enter("op=%08x", op->debug_id);
1829
1830 op->ctime = op->file[0].scb.status.mtime_client;
1831 afs_check_dir_conflict(op, &op->file[1]);
1832 afs_vnode_commit_status(op, &op->file[0]);
1833 if (op->file[1].vnode != op->file[0].vnode) {
1834 op->ctime = op->file[1].scb.status.mtime_client;
1835 afs_vnode_commit_status(op, &op->file[1]);
1836 }
1837 if (op->more_files[0].scb.have_status)
1838 afs_vnode_commit_status(op, &op->more_files[0]);
1839 if (op->more_files[1].scb.have_status)
1840 afs_vnode_commit_status(op, &op->more_files[1]);
1841
1842 /* If we're moving a subdir between dirs, we need to update
1843 * its DV counter too as the ".." will be altered.
1844 */
1845 if (op->file[0].vnode != op->file[1].vnode) {
1846 if (S_ISDIR(vnode->netfs.inode.i_mode)) {
1847 u64 new_dv;
1848
1849 write_seqlock(&vnode->cb_lock);
1850
1851 new_dv = vnode->status.data_version + 1;
1852 trace_afs_set_dv(vnode, new_dv);
1853 vnode->status.data_version = new_dv;
1854 inode_set_iversion_raw(&vnode->netfs.inode, new_dv);
1855
1856 write_sequnlock(&vnode->cb_lock);
1857 }
1858
1859 if ((op->rename.rename_flags & RENAME_EXCHANGE) &&
1860 S_ISDIR(new_vnode->netfs.inode.i_mode)) {
1861 u64 new_dv;
1862
1863 write_seqlock(&new_vnode->cb_lock);
1864
1865 new_dv = new_vnode->status.data_version + 1;
1866 new_vnode->status.data_version = new_dv;
1867 inode_set_iversion_raw(&new_vnode->netfs.inode, new_dv);
1868
1869 write_sequnlock(&new_vnode->cb_lock);
1870 }
1871 }
1872 }
1873
afs_rename_edit_dir(struct afs_operation * op)1874 static void afs_rename_edit_dir(struct afs_operation *op)
1875 {
1876 struct netfs_cache_resources orig_cres = {}, new_cres = {};
1877 struct afs_vnode_param *orig_dvp = &op->file[0];
1878 struct afs_vnode_param *new_dvp = &op->file[1];
1879 struct afs_vnode *orig_dvnode = orig_dvp->vnode;
1880 struct afs_vnode *new_dvnode = new_dvp->vnode;
1881 struct afs_vnode *vnode = AFS_FS_I(d_inode(op->dentry));
1882 struct dentry *old_dentry = op->dentry;
1883 struct dentry *new_dentry = op->dentry_2;
1884 struct inode *new_inode;
1885
1886 _enter("op=%08x", op->debug_id);
1887
1888 if (op->rename.rehash) {
1889 d_rehash(op->rename.rehash);
1890 op->rename.rehash = NULL;
1891 }
1892
1893 fscache_begin_write_operation(&orig_cres, afs_vnode_cache(orig_dvnode));
1894 if (new_dvnode != orig_dvnode)
1895 fscache_begin_write_operation(&new_cres, afs_vnode_cache(new_dvnode));
1896
1897 down_write(&orig_dvnode->validate_lock);
1898 if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags) &&
1899 orig_dvnode->status.data_version == orig_dvp->dv_before + orig_dvp->dv_delta)
1900 afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name,
1901 afs_edit_dir_for_rename_0);
1902
1903 if (new_dvnode != orig_dvnode) {
1904 up_write(&orig_dvnode->validate_lock);
1905 down_write(&new_dvnode->validate_lock);
1906 }
1907
1908 if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags) &&
1909 new_dvnode->status.data_version == new_dvp->dv_before + new_dvp->dv_delta) {
1910 if (!op->rename.new_negative)
1911 afs_edit_dir_remove(new_dvnode, &new_dentry->d_name,
1912 afs_edit_dir_for_rename_1);
1913
1914 afs_edit_dir_add(new_dvnode, &new_dentry->d_name,
1915 &vnode->fid, afs_edit_dir_for_rename_2);
1916 }
1917
1918 if (S_ISDIR(vnode->netfs.inode.i_mode) &&
1919 new_dvnode != orig_dvnode &&
1920 test_bit(AFS_VNODE_DIR_VALID, &vnode->flags))
1921 afs_edit_dir_update(vnode, &dotdot_name, new_dvnode,
1922 afs_edit_dir_for_rename_sub);
1923
1924 new_inode = d_inode(new_dentry);
1925 if (new_inode) {
1926 spin_lock(&new_inode->i_lock);
1927 if (S_ISDIR(new_inode->i_mode))
1928 clear_nlink(new_inode);
1929 else if (new_inode->i_nlink > 0)
1930 drop_nlink(new_inode);
1931 spin_unlock(&new_inode->i_lock);
1932 }
1933
1934 /* Now we can update d_fsdata on the dentries to reflect their
1935 * new parent's data_version.
1936 */
1937 afs_update_dentry_version(op, new_dvp, op->dentry);
1938 afs_update_dentry_version(op, new_dvp, op->dentry_2);
1939
1940 d_move(old_dentry, new_dentry);
1941
1942 up_write(&new_dvnode->validate_lock);
1943 fscache_end_operation(&orig_cres);
1944 if (new_dvnode != orig_dvnode)
1945 fscache_end_operation(&new_cres);
1946 }
1947
afs_rename_exchange_edit_dir(struct afs_operation * op)1948 static void afs_rename_exchange_edit_dir(struct afs_operation *op)
1949 {
1950 struct afs_vnode_param *orig_dvp = &op->file[0];
1951 struct afs_vnode_param *new_dvp = &op->file[1];
1952 struct afs_vnode *orig_dvnode = orig_dvp->vnode;
1953 struct afs_vnode *new_dvnode = new_dvp->vnode;
1954 struct afs_vnode *old_vnode = op->more_files[0].vnode;
1955 struct afs_vnode *new_vnode = op->more_files[1].vnode;
1956 struct dentry *old_dentry = op->dentry;
1957 struct dentry *new_dentry = op->dentry_2;
1958
1959 _enter("op=%08x", op->debug_id);
1960
1961 if (new_dvnode == orig_dvnode) {
1962 down_write(&orig_dvnode->validate_lock);
1963 if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags) &&
1964 orig_dvnode->status.data_version == orig_dvp->dv_before + orig_dvp->dv_delta) {
1965 afs_edit_dir_update(orig_dvnode, &old_dentry->d_name,
1966 new_vnode, afs_edit_dir_for_rename_0);
1967 afs_edit_dir_update(orig_dvnode, &new_dentry->d_name,
1968 old_vnode, afs_edit_dir_for_rename_1);
1969 }
1970
1971 d_exchange(old_dentry, new_dentry);
1972 up_write(&orig_dvnode->validate_lock);
1973 } else {
1974 down_write(&orig_dvnode->validate_lock);
1975 if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags) &&
1976 orig_dvnode->status.data_version == orig_dvp->dv_before + orig_dvp->dv_delta)
1977 afs_edit_dir_update(orig_dvnode, &old_dentry->d_name,
1978 new_vnode, afs_edit_dir_for_rename_0);
1979
1980 up_write(&orig_dvnode->validate_lock);
1981 down_write(&new_dvnode->validate_lock);
1982
1983 if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags) &&
1984 new_dvnode->status.data_version == new_dvp->dv_before + new_dvp->dv_delta)
1985 afs_edit_dir_update(new_dvnode, &new_dentry->d_name,
1986 old_vnode, afs_edit_dir_for_rename_1);
1987
1988 if (S_ISDIR(old_vnode->netfs.inode.i_mode) &&
1989 test_bit(AFS_VNODE_DIR_VALID, &old_vnode->flags))
1990 afs_edit_dir_update(old_vnode, &dotdot_name, new_dvnode,
1991 afs_edit_dir_for_rename_sub);
1992
1993 if (S_ISDIR(new_vnode->netfs.inode.i_mode) &&
1994 test_bit(AFS_VNODE_DIR_VALID, &new_vnode->flags))
1995 afs_edit_dir_update(new_vnode, &dotdot_name, orig_dvnode,
1996 afs_edit_dir_for_rename_sub);
1997
1998 /* Now we can update d_fsdata on the dentries to reflect their
1999 * new parents' data_version.
2000 */
2001 afs_update_dentry_version(op, new_dvp, old_dentry);
2002 afs_update_dentry_version(op, orig_dvp, new_dentry);
2003
2004 d_exchange(old_dentry, new_dentry);
2005 up_write(&new_dvnode->validate_lock);
2006 }
2007 }
2008
afs_rename_put(struct afs_operation * op)2009 static void afs_rename_put(struct afs_operation *op)
2010 {
2011 _enter("op=%08x", op->debug_id);
2012 if (op->rename.rehash)
2013 d_rehash(op->rename.rehash);
2014 dput(op->rename.tmp);
2015 if (afs_op_error(op))
2016 d_rehash(op->dentry);
2017 }
2018
2019 static const struct afs_operation_ops afs_rename_operation = {
2020 .issue_afs_rpc = afs_fs_rename,
2021 .issue_yfs_rpc = yfs_fs_rename,
2022 .success = afs_rename_success,
2023 .edit_dir = afs_rename_edit_dir,
2024 .put = afs_rename_put,
2025 };
2026
2027 #if 0 /* Autoswitched in yfs_fs_rename_replace(). */
2028 static const struct afs_operation_ops afs_rename_replace_operation = {
2029 .issue_afs_rpc = NULL,
2030 .issue_yfs_rpc = yfs_fs_rename_replace,
2031 .success = afs_rename_success,
2032 .edit_dir = afs_rename_edit_dir,
2033 .put = afs_rename_put,
2034 };
2035 #endif
2036
2037 static const struct afs_operation_ops afs_rename_noreplace_operation = {
2038 .issue_afs_rpc = NULL,
2039 .issue_yfs_rpc = yfs_fs_rename_noreplace,
2040 .success = afs_rename_success,
2041 .edit_dir = afs_rename_edit_dir,
2042 .put = afs_rename_put,
2043 };
2044
2045 static const struct afs_operation_ops afs_rename_exchange_operation = {
2046 .issue_afs_rpc = NULL,
2047 .issue_yfs_rpc = yfs_fs_rename_exchange,
2048 .success = afs_rename_success,
2049 .edit_dir = afs_rename_exchange_edit_dir,
2050 .put = afs_rename_put,
2051 };
2052
2053 /*
2054 * rename a file in an AFS filesystem and/or move it between directories
2055 */
afs_rename(struct mnt_idmap * idmap,struct inode * old_dir,struct dentry * old_dentry,struct inode * new_dir,struct dentry * new_dentry,unsigned int flags)2056 static int afs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
2057 struct dentry *old_dentry, struct inode *new_dir,
2058 struct dentry *new_dentry, unsigned int flags)
2059 {
2060 struct afs_operation *op;
2061 struct afs_vnode *orig_dvnode, *new_dvnode, *vnode, *new_vnode = NULL;
2062 int ret;
2063
2064 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE))
2065 return -EINVAL;
2066
2067 /* Don't allow silly-rename files be moved around. */
2068 if (old_dentry->d_flags & DCACHE_NFSFS_RENAMED)
2069 return -EINVAL;
2070
2071 vnode = AFS_FS_I(d_inode(old_dentry));
2072 orig_dvnode = AFS_FS_I(old_dir);
2073 new_dvnode = AFS_FS_I(new_dir);
2074 if (d_is_positive(new_dentry))
2075 new_vnode = AFS_FS_I(d_inode(new_dentry));
2076
2077 _enter("{%llx:%llu},{%llx:%llu},{%llx:%llu},{%pd}",
2078 orig_dvnode->fid.vid, orig_dvnode->fid.vnode,
2079 vnode->fid.vid, vnode->fid.vnode,
2080 new_dvnode->fid.vid, new_dvnode->fid.vnode,
2081 new_dentry);
2082
2083 op = afs_alloc_operation(NULL, orig_dvnode->volume);
2084 if (IS_ERR(op))
2085 return PTR_ERR(op);
2086
2087 fscache_use_cookie(afs_vnode_cache(orig_dvnode), true);
2088 if (new_dvnode != orig_dvnode)
2089 fscache_use_cookie(afs_vnode_cache(new_dvnode), true);
2090
2091 ret = afs_validate(vnode, op->key);
2092 afs_op_set_error(op, ret);
2093 if (ret < 0)
2094 goto error;
2095
2096 ret = -ENOMEM;
2097 op->more_files = kvzalloc_objs(struct afs_vnode_param, 2);
2098 if (!op->more_files)
2099 goto error;
2100
2101 afs_op_set_vnode(op, 0, orig_dvnode);
2102 afs_op_set_vnode(op, 1, new_dvnode); /* May be same as orig_dvnode */
2103 op->file[0].dv_delta = 1;
2104 op->file[1].dv_delta = 1;
2105 op->file[0].modification = true;
2106 op->file[1].modification = true;
2107 op->file[0].update_ctime = true;
2108 op->file[1].update_ctime = true;
2109 op->more_files[0].vnode = vnode;
2110 op->more_files[0].speculative = true;
2111 op->more_files[1].vnode = new_vnode;
2112 op->more_files[1].speculative = true;
2113 op->nr_files = 4;
2114
2115 op->dentry = old_dentry;
2116 op->dentry_2 = new_dentry;
2117 op->rename.rename_flags = flags;
2118 op->rename.new_negative = d_is_negative(new_dentry);
2119
2120 if (flags & RENAME_NOREPLACE) {
2121 op->ops = &afs_rename_noreplace_operation;
2122 } else if (flags & RENAME_EXCHANGE) {
2123 op->ops = &afs_rename_exchange_operation;
2124 d_drop(new_dentry);
2125 } else {
2126 /* If we might displace the target, we might need to do silly
2127 * rename.
2128 */
2129 op->ops = &afs_rename_operation;
2130
2131 /* For non-directories, check whether the target is busy and if
2132 * so, make a copy of the dentry and then do a silly-rename.
2133 * If the silly-rename succeeds, the copied dentry is hashed
2134 * and becomes the new target.
2135 */
2136 if (d_is_positive(new_dentry) && !d_is_dir(new_dentry)) {
2137 /* To prevent any new references to the target during
2138 * the rename, we unhash the dentry in advance.
2139 */
2140 if (!d_unhashed(new_dentry)) {
2141 d_drop(new_dentry);
2142 op->rename.rehash = new_dentry;
2143 }
2144
2145 if (d_count(new_dentry) > 2) {
2146 /* copy the target dentry's name */
2147 op->rename.tmp = d_alloc(new_dentry->d_parent,
2148 &new_dentry->d_name);
2149 if (!op->rename.tmp) {
2150 afs_op_nomem(op);
2151 goto error;
2152 }
2153
2154 ret = afs_sillyrename(new_dvnode,
2155 AFS_FS_I(d_inode(new_dentry)),
2156 new_dentry, op->key);
2157 if (ret) {
2158 afs_op_set_error(op, ret);
2159 goto error;
2160 }
2161
2162 op->dentry_2 = op->rename.tmp;
2163 op->rename.rehash = NULL;
2164 op->rename.new_negative = true;
2165 }
2166 }
2167 }
2168
2169 /* This bit is potentially nasty as there's a potential race with
2170 * afs_d_revalidate{,_rcu}(). We have to change d_fsdata on the dentry
2171 * to reflect it's new parent's new data_version after the op, but
2172 * d_revalidate may see old_dentry between the op having taken place
2173 * and the version being updated.
2174 *
2175 * So drop the old_dentry for now to make other threads go through
2176 * lookup instead - which we hold a lock against.
2177 */
2178 d_drop(old_dentry);
2179
2180 ret = afs_do_sync_operation(op);
2181 if (ret == -ENOTSUPP)
2182 ret = -EINVAL;
2183 out:
2184 afs_dir_unuse_cookie(orig_dvnode, ret);
2185 if (new_dvnode != orig_dvnode)
2186 afs_dir_unuse_cookie(new_dvnode, ret);
2187 return ret;
2188
2189 error:
2190 ret = afs_put_operation(op);
2191 goto out;
2192 }
2193
2194 /*
2195 * Write the file contents to the cache as a single blob.
2196 */
afs_single_writepages(struct address_space * mapping,struct writeback_control * wbc)2197 int afs_single_writepages(struct address_space *mapping,
2198 struct writeback_control *wbc)
2199 {
2200 struct afs_vnode *dvnode = AFS_FS_I(mapping->host);
2201 struct iov_iter iter;
2202 bool is_dir = (S_ISDIR(dvnode->netfs.inode.i_mode) &&
2203 !test_bit(AFS_VNODE_MOUNTPOINT, &dvnode->flags));
2204 int ret = 0;
2205
2206 /* Need to lock to prevent the folio queue and folios from being thrown
2207 * away.
2208 */
2209 down_read(&dvnode->validate_lock);
2210
2211 if (is_dir ?
2212 test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) :
2213 atomic64_read(&dvnode->cb_expires_at) != AFS_NO_CB_PROMISE) {
2214 iov_iter_folio_queue(&iter, ITER_SOURCE, dvnode->directory, 0, 0,
2215 i_size_read(&dvnode->netfs.inode));
2216 ret = netfs_writeback_single(mapping, wbc, &iter);
2217 }
2218
2219 up_read(&dvnode->validate_lock);
2220 return ret;
2221 }
2222