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Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* dir.c: AFS filesystem directory handling |
3 | * | |
f3ddee8d | 4 | * Copyright (C) 2002, 2018 Red Hat, Inc. All Rights Reserved. |
1da177e4 | 5 | * Written by David Howells (dhowells@redhat.com) |
1da177e4 LT |
6 | */ |
7 | ||
8 | #include <linux/kernel.h> | |
1da177e4 | 9 | #include <linux/fs.h> |
34286d66 | 10 | #include <linux/namei.h> |
1da177e4 | 11 | #include <linux/pagemap.h> |
f3ddee8d | 12 | #include <linux/swap.h> |
00d3b7a4 | 13 | #include <linux/ctype.h> |
e8edc6e0 | 14 | #include <linux/sched.h> |
f3ddee8d | 15 | #include <linux/task_io_accounting_ops.h> |
1da177e4 | 16 | #include "internal.h" |
a58823ac | 17 | #include "afs_fs.h" |
4ea219a8 | 18 | #include "xdr_fs.h" |
1da177e4 | 19 | |
260a9803 | 20 | static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 21 | unsigned int flags); |
1da177e4 | 22 | static int afs_dir_open(struct inode *inode, struct file *file); |
1bbae9f8 | 23 | static int afs_readdir(struct file *file, struct dir_context *ctx); |
0b728e19 | 24 | static int afs_d_revalidate(struct dentry *dentry, unsigned int flags); |
fe15ce44 | 25 | static int afs_d_delete(const struct dentry *dentry); |
79ddbfa5 | 26 | static void afs_d_iput(struct dentry *dentry, struct inode *inode); |
5cf9dd55 | 27 | static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, int nlen, |
afefdbb2 | 28 | loff_t fpos, u64 ino, unsigned dtype); |
5cf9dd55 DH |
29 | static int afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen, |
30 | loff_t fpos, u64 ino, unsigned dtype); | |
549c7297 CB |
31 | static int afs_create(struct user_namespace *mnt_userns, struct inode *dir, |
32 | struct dentry *dentry, umode_t mode, bool excl); | |
33 | static int afs_mkdir(struct user_namespace *mnt_userns, struct inode *dir, | |
34 | struct dentry *dentry, umode_t mode); | |
260a9803 DH |
35 | static int afs_rmdir(struct inode *dir, struct dentry *dentry); |
36 | static int afs_unlink(struct inode *dir, struct dentry *dentry); | |
37 | static int afs_link(struct dentry *from, struct inode *dir, | |
38 | struct dentry *dentry); | |
549c7297 CB |
39 | static int afs_symlink(struct user_namespace *mnt_userns, struct inode *dir, |
40 | struct dentry *dentry, const char *content); | |
41 | static int afs_rename(struct user_namespace *mnt_userns, struct inode *old_dir, | |
42 | struct dentry *old_dentry, struct inode *new_dir, | |
43 | struct dentry *new_dentry, unsigned int flags); | |
f3ddee8d DH |
44 | static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags); |
45 | static void afs_dir_invalidatepage(struct page *page, unsigned int offset, | |
46 | unsigned int length); | |
47 | ||
48 | static int afs_dir_set_page_dirty(struct page *page) | |
49 | { | |
50 | BUG(); /* This should never happen. */ | |
51 | } | |
1da177e4 | 52 | |
4b6f5d20 | 53 | const struct file_operations afs_dir_file_operations = { |
1da177e4 | 54 | .open = afs_dir_open, |
00d3b7a4 | 55 | .release = afs_release, |
29884eff | 56 | .iterate_shared = afs_readdir, |
e8d6c554 | 57 | .lock = afs_lock, |
3222a3e5 | 58 | .llseek = generic_file_llseek, |
1da177e4 LT |
59 | }; |
60 | ||
754661f1 | 61 | const struct inode_operations afs_dir_inode_operations = { |
260a9803 DH |
62 | .create = afs_create, |
63 | .lookup = afs_lookup, | |
64 | .link = afs_link, | |
65 | .unlink = afs_unlink, | |
66 | .symlink = afs_symlink, | |
67 | .mkdir = afs_mkdir, | |
68 | .rmdir = afs_rmdir, | |
2773bf00 | 69 | .rename = afs_rename, |
00d3b7a4 | 70 | .permission = afs_permission, |
416351f2 | 71 | .getattr = afs_getattr, |
31143d5d | 72 | .setattr = afs_setattr, |
1da177e4 LT |
73 | }; |
74 | ||
f3ddee8d DH |
75 | const struct address_space_operations afs_dir_aops = { |
76 | .set_page_dirty = afs_dir_set_page_dirty, | |
77 | .releasepage = afs_dir_releasepage, | |
78 | .invalidatepage = afs_dir_invalidatepage, | |
79 | }; | |
80 | ||
d61dcce2 | 81 | const struct dentry_operations afs_fs_dentry_operations = { |
1da177e4 LT |
82 | .d_revalidate = afs_d_revalidate, |
83 | .d_delete = afs_d_delete, | |
260a9803 | 84 | .d_release = afs_d_release, |
d18610b0 | 85 | .d_automount = afs_d_automount, |
79ddbfa5 | 86 | .d_iput = afs_d_iput, |
1da177e4 LT |
87 | }; |
88 | ||
5cf9dd55 DH |
89 | struct afs_lookup_one_cookie { |
90 | struct dir_context ctx; | |
91 | struct qstr name; | |
92 | bool found; | |
93 | struct afs_fid fid; | |
94 | }; | |
95 | ||
260a9803 | 96 | struct afs_lookup_cookie { |
5cf9dd55 DH |
97 | struct dir_context ctx; |
98 | struct qstr name; | |
99 | bool found; | |
100 | bool one_only; | |
101 | unsigned short nr_fids; | |
5cf9dd55 | 102 | struct afs_fid fids[50]; |
1da177e4 LT |
103 | }; |
104 | ||
c4508464 | 105 | /* |
255ed636 | 106 | * Drop the refs that we're holding on the folios we were reading into. We've |
c4508464 DH |
107 | * got refs on the first nr_pages pages. |
108 | */ | |
109 | static void afs_dir_read_cleanup(struct afs_read *req) | |
110 | { | |
111 | struct address_space *mapping = req->vnode->vfs_inode.i_mapping; | |
255ed636 | 112 | struct folio *folio; |
c4508464 DH |
113 | pgoff_t last = req->nr_pages - 1; |
114 | ||
115 | XA_STATE(xas, &mapping->i_pages, 0); | |
116 | ||
117 | if (unlikely(!req->nr_pages)) | |
118 | return; | |
119 | ||
120 | rcu_read_lock(); | |
255ed636 DH |
121 | xas_for_each(&xas, folio, last) { |
122 | if (xas_retry(&xas, folio)) | |
c4508464 | 123 | continue; |
255ed636 DH |
124 | BUG_ON(xa_is_value(folio)); |
125 | ASSERTCMP(folio_file_mapping(folio), ==, mapping); | |
c4508464 | 126 | |
255ed636 | 127 | folio_put(folio); |
c4508464 DH |
128 | } |
129 | ||
130 | rcu_read_unlock(); | |
131 | } | |
132 | ||
1da177e4 | 133 | /* |
255ed636 | 134 | * check that a directory folio is valid |
1da177e4 | 135 | */ |
255ed636 DH |
136 | static bool afs_dir_check_folio(struct afs_vnode *dvnode, struct folio *folio, |
137 | loff_t i_size) | |
1da177e4 | 138 | { |
255ed636 DH |
139 | union afs_xdr_dir_block *block; |
140 | size_t offset, size; | |
141 | loff_t pos; | |
1da177e4 | 142 | |
255ed636 | 143 | /* Determine how many magic numbers there should be in this folio, but |
dab17c1a DH |
144 | * we must take care because the directory may change size under us. |
145 | */ | |
255ed636 DH |
146 | pos = folio_pos(folio); |
147 | if (i_size <= pos) | |
dab17c1a DH |
148 | goto checked; |
149 | ||
255ed636 DH |
150 | size = min_t(loff_t, folio_size(folio), i_size - pos); |
151 | for (offset = 0; offset < size; offset += sizeof(*block)) { | |
152 | block = kmap_local_folio(folio, offset); | |
153 | if (block->hdr.magic != AFS_DIR_MAGIC) { | |
154 | printk("kAFS: %s(%lx): [%llx] bad magic %zx/%zx is %04hx\n", | |
155 | __func__, dvnode->vfs_inode.i_ino, | |
156 | pos, offset, size, ntohs(block->hdr.magic)); | |
157 | trace_afs_dir_check_failed(dvnode, pos + offset, i_size); | |
158 | kunmap_local(block); | |
f51375cd | 159 | trace_afs_file_error(dvnode, -EIO, afs_file_error_dir_bad_magic); |
1da177e4 LT |
160 | goto error; |
161 | } | |
63a4681f DH |
162 | |
163 | /* Make sure each block is NUL terminated so we can reasonably | |
255ed636 | 164 | * use string functions on it. The filenames in the folio |
63a4681f DH |
165 | * *should* be NUL-terminated anyway. |
166 | */ | |
255ed636 | 167 | ((u8 *)block)[AFS_DIR_BLOCK_SIZE - 1] = 0; |
63a4681f | 168 | |
255ed636 DH |
169 | kunmap_local(block); |
170 | } | |
dab17c1a | 171 | checked: |
f3ddee8d | 172 | afs_stat_v(dvnode, n_read_dir); |
be5b82db | 173 | return true; |
1da177e4 | 174 | |
ec26815a | 175 | error: |
be5b82db | 176 | return false; |
ec26815a | 177 | } |
1da177e4 | 178 | |
445b1028 | 179 | /* |
c4508464 | 180 | * Dump the contents of a directory. |
445b1028 | 181 | */ |
c4508464 | 182 | static void afs_dir_dump(struct afs_vnode *dvnode, struct afs_read *req) |
445b1028 | 183 | { |
255ed636 | 184 | union afs_xdr_dir_block *block; |
c4508464 | 185 | struct address_space *mapping = dvnode->vfs_inode.i_mapping; |
255ed636 | 186 | struct folio *folio; |
c4508464 | 187 | pgoff_t last = req->nr_pages - 1; |
255ed636 | 188 | size_t offset, size; |
445b1028 | 189 | |
c4508464 | 190 | XA_STATE(xas, &mapping->i_pages, 0); |
445b1028 | 191 | |
c4508464 | 192 | pr_warn("DIR %llx:%llx f=%llx l=%llx al=%llx\n", |
445b1028 | 193 | dvnode->fid.vid, dvnode->fid.vnode, |
c4508464 DH |
194 | req->file_size, req->len, req->actual_len); |
195 | pr_warn("DIR %llx %x %zx %zx\n", | |
196 | req->pos, req->nr_pages, | |
197 | req->iter->iov_offset, iov_iter_count(req->iter)); | |
445b1028 | 198 | |
255ed636 DH |
199 | xas_for_each(&xas, folio, last) { |
200 | if (xas_retry(&xas, folio)) | |
c4508464 | 201 | continue; |
445b1028 | 202 | |
255ed636 | 203 | BUG_ON(folio_file_mapping(folio) != mapping); |
c4508464 | 204 | |
255ed636 DH |
205 | size = min_t(loff_t, folio_size(folio), req->actual_len - folio_pos(folio)); |
206 | for (offset = 0; offset < size; offset += sizeof(*block)) { | |
207 | block = kmap_local_folio(folio, offset); | |
208 | pr_warn("[%02lx] %32phN\n", folio_index(folio) + offset, block); | |
209 | kunmap_local(block); | |
445b1028 | 210 | } |
445b1028 | 211 | } |
c4508464 DH |
212 | } |
213 | ||
214 | /* | |
255ed636 | 215 | * Check all the blocks in a directory. All the folios are held pinned. |
c4508464 DH |
216 | */ |
217 | static int afs_dir_check(struct afs_vnode *dvnode, struct afs_read *req) | |
218 | { | |
219 | struct address_space *mapping = dvnode->vfs_inode.i_mapping; | |
255ed636 | 220 | struct folio *folio; |
c4508464 DH |
221 | pgoff_t last = req->nr_pages - 1; |
222 | int ret = 0; | |
223 | ||
224 | XA_STATE(xas, &mapping->i_pages, 0); | |
225 | ||
226 | if (unlikely(!req->nr_pages)) | |
227 | return 0; | |
228 | ||
229 | rcu_read_lock(); | |
255ed636 DH |
230 | xas_for_each(&xas, folio, last) { |
231 | if (xas_retry(&xas, folio)) | |
c4508464 DH |
232 | continue; |
233 | ||
255ed636 | 234 | BUG_ON(folio_file_mapping(folio) != mapping); |
c4508464 | 235 | |
255ed636 | 236 | if (!afs_dir_check_folio(dvnode, folio, req->actual_len)) { |
c4508464 DH |
237 | afs_dir_dump(dvnode, req); |
238 | ret = -EIO; | |
239 | break; | |
240 | } | |
241 | } | |
242 | ||
243 | rcu_read_unlock(); | |
244 | return ret; | |
445b1028 DH |
245 | } |
246 | ||
1da177e4 LT |
247 | /* |
248 | * open an AFS directory file | |
249 | */ | |
250 | static int afs_dir_open(struct inode *inode, struct file *file) | |
251 | { | |
252 | _enter("{%lu}", inode->i_ino); | |
253 | ||
00317636 DH |
254 | BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); |
255 | BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); | |
1da177e4 | 256 | |
08e0e7c8 | 257 | if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) |
1da177e4 LT |
258 | return -ENOENT; |
259 | ||
00d3b7a4 | 260 | return afs_open(inode, file); |
ec26815a | 261 | } |
1da177e4 | 262 | |
f3ddee8d DH |
263 | /* |
264 | * Read the directory into the pagecache in one go, scrubbing the previous | |
255ed636 | 265 | * contents. The list of folios is returned, pinning them so that they don't |
f3ddee8d DH |
266 | * get reclaimed during the iteration. |
267 | */ | |
268 | static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key) | |
b61f7dcf | 269 | __acquires(&dvnode->validate_lock) |
f3ddee8d | 270 | { |
255ed636 | 271 | struct address_space *mapping = dvnode->vfs_inode.i_mapping; |
f3ddee8d DH |
272 | struct afs_read *req; |
273 | loff_t i_size; | |
255ed636 | 274 | int nr_pages, i; |
c4508464 DH |
275 | int ret; |
276 | ||
277 | _enter(""); | |
278 | ||
279 | req = kzalloc(sizeof(*req), GFP_KERNEL); | |
280 | if (!req) | |
281 | return ERR_PTR(-ENOMEM); | |
f3ddee8d | 282 | |
c4508464 DH |
283 | refcount_set(&req->usage, 1); |
284 | req->vnode = dvnode; | |
285 | req->key = key_get(key); | |
286 | req->cleanup = afs_dir_read_cleanup; | |
287 | ||
288 | expand: | |
f3ddee8d | 289 | i_size = i_size_read(&dvnode->vfs_inode); |
c4508464 DH |
290 | if (i_size < 2048) { |
291 | ret = afs_bad(dvnode, afs_file_error_dir_small); | |
292 | goto error; | |
293 | } | |
f51375cd DH |
294 | if (i_size > 2048 * 1024) { |
295 | trace_afs_file_error(dvnode, -EFBIG, afs_file_error_dir_big); | |
c4508464 DH |
296 | ret = -EFBIG; |
297 | goto error; | |
f51375cd | 298 | } |
f3ddee8d DH |
299 | |
300 | _enter("%llu", i_size); | |
301 | ||
f3ddee8d | 302 | nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE; |
f3ddee8d | 303 | |
f3ddee8d DH |
304 | req->actual_len = i_size; /* May change */ |
305 | req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */ | |
306 | req->data_version = dvnode->status.data_version; /* May change */ | |
c4508464 DH |
307 | iov_iter_xarray(&req->def_iter, READ, &dvnode->vfs_inode.i_mapping->i_pages, |
308 | 0, i_size); | |
309 | req->iter = &req->def_iter; | |
f3ddee8d | 310 | |
c4508464 | 311 | /* Fill in any gaps that we might find where the memory reclaimer has |
255ed636 | 312 | * been at work and pin all the folios. If there are any gaps, we will |
f3ddee8d DH |
313 | * need to reread the entire directory contents. |
314 | */ | |
c4508464 DH |
315 | i = req->nr_pages; |
316 | while (i < nr_pages) { | |
255ed636 | 317 | struct folio *folio; |
f3ddee8d | 318 | |
255ed636 DH |
319 | folio = filemap_get_folio(mapping, i); |
320 | if (!folio) { | |
f3ddee8d DH |
321 | if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
322 | afs_stat_v(dvnode, n_inval); | |
323 | ||
324 | ret = -ENOMEM; | |
255ed636 DH |
325 | folio = __filemap_get_folio(mapping, |
326 | i, FGP_LOCK | FGP_CREAT, | |
327 | mapping->gfp_mask); | |
328 | if (!folio) | |
f3ddee8d | 329 | goto error; |
255ed636 DH |
330 | folio_attach_private(folio, (void *)1); |
331 | folio_unlock(folio); | |
f3ddee8d | 332 | } |
255ed636 DH |
333 | |
334 | req->nr_pages += folio_nr_pages(folio); | |
335 | i += folio_nr_pages(folio); | |
c4508464 | 336 | } |
f3ddee8d DH |
337 | |
338 | /* If we're going to reload, we need to lock all the pages to prevent | |
339 | * races. | |
340 | */ | |
b61f7dcf DH |
341 | ret = -ERESTARTSYS; |
342 | if (down_read_killable(&dvnode->validate_lock) < 0) | |
343 | goto error; | |
f3ddee8d | 344 | |
b61f7dcf DH |
345 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
346 | goto success; | |
f3ddee8d | 347 | |
b61f7dcf DH |
348 | up_read(&dvnode->validate_lock); |
349 | if (down_write_killable(&dvnode->validate_lock) < 0) | |
350 | goto error; | |
351 | ||
352 | if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { | |
99987c56 | 353 | trace_afs_reload_dir(dvnode); |
c69bf479 | 354 | ret = afs_fetch_data(dvnode, req); |
f3ddee8d | 355 | if (ret < 0) |
b61f7dcf | 356 | goto error_unlock; |
f3ddee8d DH |
357 | |
358 | task_io_account_read(PAGE_SIZE * req->nr_pages); | |
359 | ||
c4508464 DH |
360 | if (req->len < req->file_size) { |
361 | /* The content has grown, so we need to expand the | |
362 | * buffer. | |
363 | */ | |
364 | up_write(&dvnode->validate_lock); | |
365 | goto expand; | |
366 | } | |
f3ddee8d DH |
367 | |
368 | /* Validate the data we just read. */ | |
c4508464 DH |
369 | ret = afs_dir_check(dvnode, req); |
370 | if (ret < 0) | |
445b1028 | 371 | goto error_unlock; |
f3ddee8d DH |
372 | |
373 | // TODO: Trim excess pages | |
374 | ||
375 | set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags); | |
376 | } | |
377 | ||
b61f7dcf | 378 | downgrade_write(&dvnode->validate_lock); |
f3ddee8d | 379 | success: |
f3ddee8d DH |
380 | return req; |
381 | ||
f3ddee8d | 382 | error_unlock: |
b61f7dcf | 383 | up_write(&dvnode->validate_lock); |
f3ddee8d DH |
384 | error: |
385 | afs_put_read(req); | |
386 | _leave(" = %d", ret); | |
387 | return ERR_PTR(ret); | |
f3ddee8d DH |
388 | } |
389 | ||
1da177e4 LT |
390 | /* |
391 | * deal with one block in an AFS directory | |
392 | */ | |
f51375cd DH |
393 | static int afs_dir_iterate_block(struct afs_vnode *dvnode, |
394 | struct dir_context *ctx, | |
00317636 | 395 | union afs_xdr_dir_block *block, |
1bbae9f8 | 396 | unsigned blkoff) |
1da177e4 | 397 | { |
00317636 | 398 | union afs_xdr_dirent *dire; |
366911cd | 399 | unsigned offset, next, curr, nr_slots; |
1da177e4 | 400 | size_t nlen; |
1bbae9f8 | 401 | int tmp; |
1da177e4 | 402 | |
255ed636 | 403 | _enter("%llx,%x", ctx->pos, blkoff); |
1da177e4 | 404 | |
00317636 | 405 | curr = (ctx->pos - blkoff) / sizeof(union afs_xdr_dirent); |
1da177e4 LT |
406 | |
407 | /* walk through the block, an entry at a time */ | |
4ea219a8 DH |
408 | for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS); |
409 | offset < AFS_DIR_SLOTS_PER_BLOCK; | |
1da177e4 LT |
410 | offset = next |
411 | ) { | |
1da177e4 | 412 | /* skip entries marked unused in the bitmap */ |
00317636 | 413 | if (!(block->hdr.bitmap[offset / 8] & |
1da177e4 | 414 | (1 << (offset % 8)))) { |
5b5e0928 | 415 | _debug("ENT[%zu.%u]: unused", |
00317636 | 416 | blkoff / sizeof(union afs_xdr_dir_block), offset); |
366911cd | 417 | next = offset + 1; |
1da177e4 | 418 | if (offset >= curr) |
1bbae9f8 | 419 | ctx->pos = blkoff + |
00317636 | 420 | next * sizeof(union afs_xdr_dirent); |
1da177e4 LT |
421 | continue; |
422 | } | |
423 | ||
424 | /* got a valid entry */ | |
425 | dire = &block->dirents[offset]; | |
426 | nlen = strnlen(dire->u.name, | |
427 | sizeof(*block) - | |
00317636 | 428 | offset * sizeof(union afs_xdr_dirent)); |
366911cd DH |
429 | if (nlen > AFSNAMEMAX - 1) { |
430 | _debug("ENT[%zu]: name too long (len %u/%zu)", | |
431 | blkoff / sizeof(union afs_xdr_dir_block), | |
432 | offset, nlen); | |
433 | return afs_bad(dvnode, afs_file_error_dir_name_too_long); | |
434 | } | |
1da177e4 | 435 | |
5b5e0928 | 436 | _debug("ENT[%zu.%u]: %s %zu \"%s\"", |
00317636 | 437 | blkoff / sizeof(union afs_xdr_dir_block), offset, |
1da177e4 LT |
438 | (offset < curr ? "skip" : "fill"), |
439 | nlen, dire->u.name); | |
440 | ||
366911cd DH |
441 | nr_slots = afs_dir_calc_slots(nlen); |
442 | next = offset + nr_slots; | |
443 | if (next > AFS_DIR_SLOTS_PER_BLOCK) { | |
444 | _debug("ENT[%zu.%u]:" | |
445 | " %u extends beyond end dir block" | |
446 | " (len %zu)", | |
447 | blkoff / sizeof(union afs_xdr_dir_block), | |
448 | offset, next, nlen); | |
449 | return afs_bad(dvnode, afs_file_error_dir_over_end); | |
450 | } | |
451 | ||
452 | /* Check that the name-extension dirents are all allocated */ | |
453 | for (tmp = 1; tmp < nr_slots; tmp++) { | |
454 | unsigned int ix = offset + tmp; | |
455 | if (!(block->hdr.bitmap[ix / 8] & (1 << (ix % 8)))) { | |
456 | _debug("ENT[%zu.u]:" | |
457 | " %u unmarked extension (%u/%u)", | |
00317636 | 458 | blkoff / sizeof(union afs_xdr_dir_block), |
366911cd | 459 | offset, tmp, nr_slots); |
f51375cd | 460 | return afs_bad(dvnode, afs_file_error_dir_unmarked_ext); |
1da177e4 | 461 | } |
1da177e4 LT |
462 | } |
463 | ||
464 | /* skip if starts before the current position */ | |
465 | if (offset < curr) | |
466 | continue; | |
467 | ||
468 | /* found the next entry */ | |
1bbae9f8 | 469 | if (!dir_emit(ctx, dire->u.name, nlen, |
1da177e4 | 470 | ntohl(dire->u.vnode), |
5cf9dd55 DH |
471 | (ctx->actor == afs_lookup_filldir || |
472 | ctx->actor == afs_lookup_one_filldir)? | |
1bbae9f8 | 473 | ntohl(dire->u.unique) : DT_UNKNOWN)) { |
1da177e4 LT |
474 | _leave(" = 0 [full]"); |
475 | return 0; | |
476 | } | |
477 | ||
00317636 | 478 | ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent); |
1da177e4 LT |
479 | } |
480 | ||
481 | _leave(" = 1 [more]"); | |
482 | return 1; | |
ec26815a | 483 | } |
1da177e4 | 484 | |
1da177e4 | 485 | /* |
08e0e7c8 | 486 | * iterate through the data blob that lists the contents of an AFS directory |
1da177e4 | 487 | */ |
1bbae9f8 | 488 | static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx, |
9dd0b82e | 489 | struct key *key, afs_dataversion_t *_dir_version) |
1da177e4 | 490 | { |
f3ddee8d | 491 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
00317636 | 492 | union afs_xdr_dir_block *dblock; |
f3ddee8d | 493 | struct afs_read *req; |
255ed636 DH |
494 | struct folio *folio; |
495 | unsigned offset, size; | |
1da177e4 LT |
496 | int ret; |
497 | ||
1bbae9f8 | 498 | _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos); |
1da177e4 | 499 | |
08e0e7c8 | 500 | if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { |
1da177e4 LT |
501 | _leave(" = -ESTALE"); |
502 | return -ESTALE; | |
503 | } | |
504 | ||
f3ddee8d DH |
505 | req = afs_read_dir(dvnode, key); |
506 | if (IS_ERR(req)) | |
507 | return PTR_ERR(req); | |
9dd0b82e | 508 | *_dir_version = req->data_version; |
f3ddee8d | 509 | |
1da177e4 | 510 | /* round the file position up to the next entry boundary */ |
00317636 DH |
511 | ctx->pos += sizeof(union afs_xdr_dirent) - 1; |
512 | ctx->pos &= ~(sizeof(union afs_xdr_dirent) - 1); | |
1da177e4 LT |
513 | |
514 | /* walk through the blocks in sequence */ | |
515 | ret = 0; | |
f3ddee8d | 516 | while (ctx->pos < req->actual_len) { |
255ed636 | 517 | /* Fetch the appropriate folio from the directory and re-add it |
c4508464 | 518 | * to the LRU. We have all the pages pinned with an extra ref. |
f3ddee8d | 519 | */ |
255ed636 DH |
520 | folio = __filemap_get_folio(dir->i_mapping, ctx->pos / PAGE_SIZE, |
521 | FGP_ACCESSED, 0); | |
522 | if (!folio) { | |
f51375cd | 523 | ret = afs_bad(dvnode, afs_file_error_dir_missing_page); |
1da177e4 LT |
524 | break; |
525 | } | |
526 | ||
255ed636 DH |
527 | offset = round_down(ctx->pos, sizeof(*dblock)) - folio_file_pos(folio); |
528 | size = min_t(loff_t, folio_size(folio), | |
529 | req->actual_len - folio_file_pos(folio)); | |
1da177e4 | 530 | |
1da177e4 | 531 | do { |
255ed636 DH |
532 | dblock = kmap_local_folio(folio, offset); |
533 | ret = afs_dir_iterate_block(dvnode, ctx, dblock, | |
534 | folio_file_pos(folio) + offset); | |
535 | kunmap_local(dblock); | |
536 | if (ret != 1) | |
1da177e4 | 537 | goto out; |
1da177e4 | 538 | |
255ed636 | 539 | } while (offset += sizeof(*dblock), offset < size); |
1da177e4 | 540 | |
1da177e4 LT |
541 | ret = 0; |
542 | } | |
543 | ||
ec26815a | 544 | out: |
b61f7dcf | 545 | up_read(&dvnode->validate_lock); |
f3ddee8d | 546 | afs_put_read(req); |
1da177e4 LT |
547 | _leave(" = %d", ret); |
548 | return ret; | |
ec26815a | 549 | } |
1da177e4 | 550 | |
1da177e4 LT |
551 | /* |
552 | * read an AFS directory | |
553 | */ | |
1bbae9f8 | 554 | static int afs_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 555 | { |
9dd0b82e DH |
556 | afs_dataversion_t dir_version; |
557 | ||
558 | return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file), | |
559 | &dir_version); | |
ec26815a | 560 | } |
1da177e4 | 561 | |
1da177e4 | 562 | /* |
5cf9dd55 | 563 | * Search the directory for a single name |
1da177e4 LT |
564 | * - if afs_dir_iterate_block() spots this function, it'll pass the FID |
565 | * uniquifier through dtype | |
566 | */ | |
5cf9dd55 DH |
567 | static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, |
568 | int nlen, loff_t fpos, u64 ino, unsigned dtype) | |
1da177e4 | 569 | { |
5cf9dd55 DH |
570 | struct afs_lookup_one_cookie *cookie = |
571 | container_of(ctx, struct afs_lookup_one_cookie, ctx); | |
1da177e4 | 572 | |
1bbae9f8 AV |
573 | _enter("{%s,%u},%s,%u,,%llu,%u", |
574 | cookie->name.name, cookie->name.len, name, nlen, | |
ba3e0e1a | 575 | (unsigned long long) ino, dtype); |
1da177e4 | 576 | |
08e0e7c8 | 577 | /* insanity checks first */ |
00317636 DH |
578 | BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); |
579 | BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); | |
08e0e7c8 | 580 | |
1bbae9f8 AV |
581 | if (cookie->name.len != nlen || |
582 | memcmp(cookie->name.name, name, nlen) != 0) { | |
1da177e4 LT |
583 | _leave(" = 0 [no]"); |
584 | return 0; | |
585 | } | |
586 | ||
587 | cookie->fid.vnode = ino; | |
588 | cookie->fid.unique = dtype; | |
589 | cookie->found = 1; | |
590 | ||
591 | _leave(" = -1 [found]"); | |
592 | return -1; | |
ec26815a | 593 | } |
1da177e4 | 594 | |
1da177e4 | 595 | /* |
5cf9dd55 | 596 | * Do a lookup of a single name in a directory |
260a9803 | 597 | * - just returns the FID the dentry name maps to if found |
1da177e4 | 598 | */ |
5cf9dd55 | 599 | static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry, |
9dd0b82e DH |
600 | struct afs_fid *fid, struct key *key, |
601 | afs_dataversion_t *_dir_version) | |
1da177e4 | 602 | { |
1bbae9f8 | 603 | struct afs_super_info *as = dir->i_sb->s_fs_info; |
5cf9dd55 DH |
604 | struct afs_lookup_one_cookie cookie = { |
605 | .ctx.actor = afs_lookup_one_filldir, | |
1bbae9f8 AV |
606 | .name = dentry->d_name, |
607 | .fid.vid = as->volume->vid | |
608 | }; | |
1da177e4 LT |
609 | int ret; |
610 | ||
a455589f | 611 | _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); |
1da177e4 | 612 | |
1da177e4 | 613 | /* search the directory */ |
9dd0b82e | 614 | ret = afs_dir_iterate(dir, &cookie.ctx, key, _dir_version); |
1da177e4 | 615 | if (ret < 0) { |
08e0e7c8 DH |
616 | _leave(" = %d [iter]", ret); |
617 | return ret; | |
1da177e4 LT |
618 | } |
619 | ||
1da177e4 | 620 | if (!cookie.found) { |
08e0e7c8 DH |
621 | _leave(" = -ENOENT [not found]"); |
622 | return -ENOENT; | |
1da177e4 LT |
623 | } |
624 | ||
08e0e7c8 | 625 | *fid = cookie.fid; |
3b6492df | 626 | _leave(" = 0 { vn=%llu u=%u }", fid->vnode, fid->unique); |
08e0e7c8 DH |
627 | return 0; |
628 | } | |
629 | ||
5cf9dd55 DH |
630 | /* |
631 | * search the directory for a name | |
632 | * - if afs_dir_iterate_block() spots this function, it'll pass the FID | |
633 | * uniquifier through dtype | |
634 | */ | |
635 | static int afs_lookup_filldir(struct dir_context *ctx, const char *name, | |
636 | int nlen, loff_t fpos, u64 ino, unsigned dtype) | |
637 | { | |
638 | struct afs_lookup_cookie *cookie = | |
639 | container_of(ctx, struct afs_lookup_cookie, ctx); | |
640 | int ret; | |
641 | ||
642 | _enter("{%s,%u},%s,%u,,%llu,%u", | |
643 | cookie->name.name, cookie->name.len, name, nlen, | |
644 | (unsigned long long) ino, dtype); | |
645 | ||
646 | /* insanity checks first */ | |
00317636 DH |
647 | BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); |
648 | BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); | |
5cf9dd55 DH |
649 | |
650 | if (cookie->found) { | |
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 | } else if (cookie->name.len == nlen && | |
657 | memcmp(cookie->name.name, name, nlen) == 0) { | |
e49c7b2f DH |
658 | cookie->fids[1].vnode = ino; |
659 | cookie->fids[1].unique = dtype; | |
5cf9dd55 DH |
660 | cookie->found = 1; |
661 | if (cookie->one_only) | |
662 | return -1; | |
663 | } | |
664 | ||
665 | ret = cookie->nr_fids >= 50 ? -1 : 0; | |
666 | _leave(" = %d", ret); | |
667 | return ret; | |
668 | } | |
669 | ||
e49c7b2f DH |
670 | /* |
671 | * Deal with the result of a successful lookup operation. Turn all the files | |
672 | * into inodes and save the first one - which is the one we actually want. | |
673 | */ | |
674 | static void afs_do_lookup_success(struct afs_operation *op) | |
675 | { | |
676 | struct afs_vnode_param *vp; | |
677 | struct afs_vnode *vnode; | |
678 | struct inode *inode; | |
679 | u32 abort_code; | |
680 | int i; | |
681 | ||
682 | _enter(""); | |
683 | ||
684 | for (i = 0; i < op->nr_files; i++) { | |
685 | switch (i) { | |
686 | case 0: | |
687 | vp = &op->file[0]; | |
688 | abort_code = vp->scb.status.abort_code; | |
689 | if (abort_code != 0) { | |
44767c35 | 690 | op->ac.abort_code = abort_code; |
e49c7b2f DH |
691 | op->error = afs_abort_to_error(abort_code); |
692 | } | |
693 | break; | |
694 | ||
695 | case 1: | |
696 | vp = &op->file[1]; | |
697 | break; | |
698 | ||
699 | default: | |
700 | vp = &op->more_files[i - 2]; | |
701 | break; | |
702 | } | |
703 | ||
704 | if (!vp->scb.have_status && !vp->scb.have_error) | |
705 | continue; | |
706 | ||
707 | _debug("do [%u]", i); | |
708 | if (vp->vnode) { | |
709 | if (!test_bit(AFS_VNODE_UNSET, &vp->vnode->flags)) | |
710 | afs_vnode_commit_status(op, vp); | |
711 | } else if (vp->scb.status.abort_code == 0) { | |
712 | inode = afs_iget(op, vp); | |
713 | if (!IS_ERR(inode)) { | |
714 | vnode = AFS_FS_I(inode); | |
715 | afs_cache_permit(vnode, op->key, | |
716 | 0 /* Assume vnode->cb_break is 0 */ + | |
717 | op->cb_v_break, | |
718 | &vp->scb); | |
719 | vp->vnode = vnode; | |
720 | vp->put_vnode = true; | |
721 | } | |
722 | } else { | |
723 | _debug("- abort %d %llx:%llx.%x", | |
724 | vp->scb.status.abort_code, | |
725 | vp->fid.vid, vp->fid.vnode, vp->fid.unique); | |
726 | } | |
727 | } | |
728 | ||
729 | _leave(""); | |
730 | } | |
731 | ||
732 | static const struct afs_operation_ops afs_inline_bulk_status_operation = { | |
733 | .issue_afs_rpc = afs_fs_inline_bulk_status, | |
734 | .issue_yfs_rpc = yfs_fs_inline_bulk_status, | |
735 | .success = afs_do_lookup_success, | |
736 | }; | |
737 | ||
b6489a49 | 738 | static const struct afs_operation_ops afs_lookup_fetch_status_operation = { |
e49c7b2f DH |
739 | .issue_afs_rpc = afs_fs_fetch_status, |
740 | .issue_yfs_rpc = yfs_fs_fetch_status, | |
741 | .success = afs_do_lookup_success, | |
728279a5 | 742 | .aborted = afs_check_for_remote_deletion, |
e49c7b2f DH |
743 | }; |
744 | ||
20325960 DH |
745 | /* |
746 | * See if we know that the server we expect to use doesn't support | |
747 | * FS.InlineBulkStatus. | |
748 | */ | |
749 | static bool afs_server_supports_ibulk(struct afs_vnode *dvnode) | |
750 | { | |
751 | struct afs_server_list *slist; | |
752 | struct afs_volume *volume = dvnode->volume; | |
753 | struct afs_server *server; | |
754 | bool ret = true; | |
755 | int i; | |
756 | ||
757 | if (!test_bit(AFS_VOLUME_MAYBE_NO_IBULK, &volume->flags)) | |
758 | return true; | |
759 | ||
760 | rcu_read_lock(); | |
761 | slist = rcu_dereference(volume->servers); | |
762 | ||
763 | for (i = 0; i < slist->nr_servers; i++) { | |
764 | server = slist->servers[i].server; | |
765 | if (server == dvnode->cb_server) { | |
766 | if (test_bit(AFS_SERVER_FL_NO_IBULK, &server->flags)) | |
767 | ret = false; | |
768 | break; | |
769 | } | |
770 | } | |
771 | ||
772 | rcu_read_unlock(); | |
773 | return ret; | |
774 | } | |
775 | ||
5cf9dd55 DH |
776 | /* |
777 | * Do a lookup in a directory. We make use of bulk lookup to query a slew of | |
778 | * files in one go and create inodes for them. The inode of the file we were | |
779 | * asked for is returned. | |
780 | */ | |
781 | static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry, | |
782 | struct key *key) | |
783 | { | |
784 | struct afs_lookup_cookie *cookie; | |
e49c7b2f DH |
785 | struct afs_vnode_param *vp; |
786 | struct afs_operation *op; | |
39db9815 DH |
787 | struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode; |
788 | struct inode *inode = NULL, *ti; | |
9dd0b82e | 789 | afs_dataversion_t data_version = READ_ONCE(dvnode->status.data_version); |
e49c7b2f DH |
790 | long ret; |
791 | int i; | |
5cf9dd55 DH |
792 | |
793 | _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); | |
794 | ||
795 | cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL); | |
796 | if (!cookie) | |
797 | return ERR_PTR(-ENOMEM); | |
798 | ||
e49c7b2f DH |
799 | for (i = 0; i < ARRAY_SIZE(cookie->fids); i++) |
800 | cookie->fids[i].vid = dvnode->fid.vid; | |
5cf9dd55 DH |
801 | cookie->ctx.actor = afs_lookup_filldir; |
802 | cookie->name = dentry->d_name; | |
13fcc635 DH |
803 | cookie->nr_fids = 2; /* slot 0 is saved for the fid we actually want |
804 | * and slot 1 for the directory */ | |
5cf9dd55 | 805 | |
20325960 DH |
806 | if (!afs_server_supports_ibulk(dvnode)) |
807 | cookie->one_only = true; | |
5cf9dd55 | 808 | |
5cf9dd55 | 809 | /* search the directory */ |
9dd0b82e | 810 | ret = afs_dir_iterate(dir, &cookie->ctx, key, &data_version); |
e49c7b2f | 811 | if (ret < 0) |
5cf9dd55 | 812 | goto out; |
5cf9dd55 | 813 | |
9dd0b82e DH |
814 | dentry->d_fsdata = (void *)(unsigned long)data_version; |
815 | ||
e49c7b2f | 816 | ret = -ENOENT; |
5cf9dd55 DH |
817 | if (!cookie->found) |
818 | goto out; | |
819 | ||
820 | /* Check to see if we already have an inode for the primary fid. */ | |
e49c7b2f DH |
821 | inode = ilookup5(dir->i_sb, cookie->fids[1].vnode, |
822 | afs_ilookup5_test_by_fid, &cookie->fids[1]); | |
5cf9dd55 | 823 | if (inode) |
e49c7b2f | 824 | goto out; /* We do */ |
5cf9dd55 | 825 | |
e49c7b2f DH |
826 | /* Okay, we didn't find it. We need to query the server - and whilst |
827 | * we're doing that, we're going to attempt to look up a bunch of other | |
828 | * vnodes also. | |
829 | */ | |
830 | op = afs_alloc_operation(NULL, dvnode->volume); | |
831 | if (IS_ERR(op)) { | |
832 | ret = PTR_ERR(op); | |
5cf9dd55 | 833 | goto out; |
e49c7b2f | 834 | } |
5cf9dd55 | 835 | |
e49c7b2f DH |
836 | afs_op_set_vnode(op, 0, dvnode); |
837 | afs_op_set_fid(op, 1, &cookie->fids[1]); | |
13fcc635 | 838 | |
e49c7b2f DH |
839 | op->nr_files = cookie->nr_fids; |
840 | _debug("nr_files %u", op->nr_files); | |
39db9815 | 841 | |
e49c7b2f DH |
842 | /* Need space for examining all the selected files */ |
843 | op->error = -ENOMEM; | |
844 | if (op->nr_files > 2) { | |
845 | op->more_files = kvcalloc(op->nr_files - 2, | |
846 | sizeof(struct afs_vnode_param), | |
847 | GFP_KERNEL); | |
848 | if (!op->more_files) | |
849 | goto out_op; | |
850 | ||
851 | for (i = 2; i < op->nr_files; i++) { | |
852 | vp = &op->more_files[i - 2]; | |
853 | vp->fid = cookie->fids[i]; | |
854 | ||
855 | /* Find any inodes that already exist and get their | |
856 | * callback counters. | |
857 | */ | |
858 | ti = ilookup5_nowait(dir->i_sb, vp->fid.vnode, | |
859 | afs_ilookup5_test_by_fid, &vp->fid); | |
860 | if (!IS_ERR_OR_NULL(ti)) { | |
861 | vnode = AFS_FS_I(ti); | |
862 | vp->dv_before = vnode->status.data_version; | |
863 | vp->cb_break_before = afs_calc_vnode_cb_break(vnode); | |
864 | vp->vnode = vnode; | |
865 | vp->put_vnode = true; | |
a9e5c87c | 866 | vp->speculative = true; /* vnode not locked */ |
e49c7b2f | 867 | } |
39db9815 DH |
868 | } |
869 | } | |
870 | ||
5cf9dd55 DH |
871 | /* Try FS.InlineBulkStatus first. Abort codes for the individual |
872 | * lookups contained therein are stored in the reply without aborting | |
873 | * the whole operation. | |
874 | */ | |
e49c7b2f DH |
875 | op->error = -ENOTSUPP; |
876 | if (!cookie->one_only) { | |
877 | op->ops = &afs_inline_bulk_status_operation; | |
878 | afs_begin_vnode_operation(op); | |
879 | afs_wait_for_operation(op); | |
5cf9dd55 DH |
880 | } |
881 | ||
e49c7b2f DH |
882 | if (op->error == -ENOTSUPP) { |
883 | /* We could try FS.BulkStatus next, but this aborts the entire | |
884 | * op if any of the lookups fails - so, for the moment, revert | |
885 | * to FS.FetchStatus for op->file[1]. | |
886 | */ | |
887 | op->fetch_status.which = 1; | |
f8ea5c7b | 888 | op->ops = &afs_lookup_fetch_status_operation; |
e49c7b2f DH |
889 | afs_begin_vnode_operation(op); |
890 | afs_wait_for_operation(op); | |
5cf9dd55 | 891 | } |
e49c7b2f | 892 | inode = ERR_PTR(op->error); |
5cf9dd55 | 893 | |
e49c7b2f DH |
894 | out_op: |
895 | if (op->error == 0) { | |
896 | inode = &op->file[1].vnode->vfs_inode; | |
897 | op->file[1].vnode = NULL; | |
5cf9dd55 DH |
898 | } |
899 | ||
e49c7b2f DH |
900 | if (op->file[0].scb.have_status) |
901 | dentry->d_fsdata = (void *)(unsigned long)op->file[0].scb.status.data_version; | |
902 | else | |
903 | dentry->d_fsdata = (void *)(unsigned long)op->file[0].dv_before; | |
904 | ret = afs_put_operation(op); | |
5cf9dd55 DH |
905 | out: |
906 | kfree(cookie); | |
e49c7b2f DH |
907 | _leave(""); |
908 | return inode ?: ERR_PTR(ret); | |
5cf9dd55 DH |
909 | } |
910 | ||
6f8880d8 DH |
911 | /* |
912 | * Look up an entry in a directory with @sys substitution. | |
913 | */ | |
914 | static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry, | |
915 | struct key *key) | |
916 | { | |
917 | struct afs_sysnames *subs; | |
918 | struct afs_net *net = afs_i2net(dir); | |
919 | struct dentry *ret; | |
920 | char *buf, *p, *name; | |
921 | int len, i; | |
922 | ||
923 | _enter(""); | |
924 | ||
925 | ret = ERR_PTR(-ENOMEM); | |
926 | p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL); | |
927 | if (!buf) | |
928 | goto out_p; | |
929 | if (dentry->d_name.len > 4) { | |
930 | memcpy(p, dentry->d_name.name, dentry->d_name.len - 4); | |
931 | p += dentry->d_name.len - 4; | |
932 | } | |
933 | ||
934 | /* There is an ordered list of substitutes that we have to try. */ | |
935 | read_lock(&net->sysnames_lock); | |
936 | subs = net->sysnames; | |
937 | refcount_inc(&subs->usage); | |
938 | read_unlock(&net->sysnames_lock); | |
939 | ||
940 | for (i = 0; i < subs->nr; i++) { | |
941 | name = subs->subs[i]; | |
942 | len = dentry->d_name.len - 4 + strlen(name); | |
943 | if (len >= AFSNAMEMAX) { | |
944 | ret = ERR_PTR(-ENAMETOOLONG); | |
945 | goto out_s; | |
946 | } | |
947 | ||
948 | strcpy(p, name); | |
949 | ret = lookup_one_len(buf, dentry->d_parent, len); | |
950 | if (IS_ERR(ret) || d_is_positive(ret)) | |
951 | goto out_s; | |
952 | dput(ret); | |
953 | } | |
954 | ||
955 | /* We don't want to d_add() the @sys dentry here as we don't want to | |
956 | * the cached dentry to hide changes to the sysnames list. | |
957 | */ | |
958 | ret = NULL; | |
959 | out_s: | |
960 | afs_put_sysnames(subs); | |
961 | kfree(buf); | |
962 | out_p: | |
963 | key_put(key); | |
964 | return ret; | |
965 | } | |
966 | ||
08e0e7c8 DH |
967 | /* |
968 | * look up an entry in a directory | |
969 | */ | |
260a9803 | 970 | static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 971 | unsigned int flags) |
08e0e7c8 | 972 | { |
5cf9dd55 | 973 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
40a708bd | 974 | struct afs_fid fid = {}; |
08e0e7c8 | 975 | struct inode *inode; |
34b2a88f | 976 | struct dentry *d; |
00d3b7a4 | 977 | struct key *key; |
08e0e7c8 DH |
978 | int ret; |
979 | ||
3b6492df | 980 | _enter("{%llx:%llu},%p{%pd},", |
5cf9dd55 | 981 | dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry); |
260a9803 | 982 | |
2b0143b5 | 983 | ASSERTCMP(d_inode(dentry), ==, NULL); |
08e0e7c8 | 984 | |
45222b9e | 985 | if (dentry->d_name.len >= AFSNAMEMAX) { |
08e0e7c8 DH |
986 | _leave(" = -ENAMETOOLONG"); |
987 | return ERR_PTR(-ENAMETOOLONG); | |
988 | } | |
989 | ||
5cf9dd55 | 990 | if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) { |
08e0e7c8 DH |
991 | _leave(" = -ESTALE"); |
992 | return ERR_PTR(-ESTALE); | |
993 | } | |
994 | ||
5cf9dd55 | 995 | key = afs_request_key(dvnode->volume->cell); |
00d3b7a4 DH |
996 | if (IS_ERR(key)) { |
997 | _leave(" = %ld [key]", PTR_ERR(key)); | |
e231c2ee | 998 | return ERR_CAST(key); |
00d3b7a4 DH |
999 | } |
1000 | ||
5cf9dd55 | 1001 | ret = afs_validate(dvnode, key); |
260a9803 DH |
1002 | if (ret < 0) { |
1003 | key_put(key); | |
1004 | _leave(" = %d [val]", ret); | |
1005 | return ERR_PTR(ret); | |
1006 | } | |
1007 | ||
6f8880d8 DH |
1008 | if (dentry->d_name.len >= 4 && |
1009 | dentry->d_name.name[dentry->d_name.len - 4] == '@' && | |
1010 | dentry->d_name.name[dentry->d_name.len - 3] == 's' && | |
1011 | dentry->d_name.name[dentry->d_name.len - 2] == 'y' && | |
1012 | dentry->d_name.name[dentry->d_name.len - 1] == 's') | |
1013 | return afs_lookup_atsys(dir, dentry, key); | |
1014 | ||
d55b4da4 | 1015 | afs_stat_v(dvnode, n_lookup); |
5cf9dd55 | 1016 | inode = afs_do_lookup(dir, dentry, key); |
00d3b7a4 | 1017 | key_put(key); |
f52b83b0 | 1018 | if (inode == ERR_PTR(-ENOENT)) |
34b2a88f | 1019 | inode = afs_try_auto_mntpt(dentry, dir); |
40a708bd DH |
1020 | |
1021 | if (!IS_ERR_OR_NULL(inode)) | |
1022 | fid = AFS_FS_I(inode)->fid; | |
1023 | ||
fed79fd7 | 1024 | _debug("splice %p", dentry->d_inode); |
34b2a88f | 1025 | d = d_splice_alias(inode, dentry); |
80548b03 | 1026 | if (!IS_ERR_OR_NULL(d)) { |
34b2a88f | 1027 | d->d_fsdata = dentry->d_fsdata; |
40a708bd | 1028 | trace_afs_lookup(dvnode, &d->d_name, &fid); |
80548b03 | 1029 | } else { |
40a708bd | 1030 | trace_afs_lookup(dvnode, &dentry->d_name, &fid); |
80548b03 | 1031 | } |
e49c7b2f | 1032 | _leave(""); |
34b2a88f | 1033 | return d; |
ec26815a | 1034 | } |
1da177e4 | 1035 | |
a0753c29 DH |
1036 | /* |
1037 | * Check the validity of a dentry under RCU conditions. | |
1038 | */ | |
1039 | static int afs_d_revalidate_rcu(struct dentry *dentry) | |
1040 | { | |
63d49d84 | 1041 | struct afs_vnode *dvnode; |
a0753c29 | 1042 | struct dentry *parent; |
63d49d84 | 1043 | struct inode *dir; |
a0753c29 DH |
1044 | long dir_version, de_version; |
1045 | ||
1046 | _enter("%p", dentry); | |
1047 | ||
1048 | /* Check the parent directory is still valid first. */ | |
1049 | parent = READ_ONCE(dentry->d_parent); | |
1050 | dir = d_inode_rcu(parent); | |
1051 | if (!dir) | |
1052 | return -ECHILD; | |
1053 | dvnode = AFS_FS_I(dir); | |
1054 | if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) | |
1055 | return -ECHILD; | |
1056 | ||
1057 | if (!afs_check_validity(dvnode)) | |
1058 | return -ECHILD; | |
1059 | ||
1060 | /* We only need to invalidate a dentry if the server's copy changed | |
1061 | * behind our back. If we made the change, it's no problem. Note that | |
1062 | * on a 32-bit system, we only have 32 bits in the dentry to store the | |
1063 | * version. | |
1064 | */ | |
1065 | dir_version = (long)READ_ONCE(dvnode->status.data_version); | |
1066 | de_version = (long)READ_ONCE(dentry->d_fsdata); | |
1067 | if (de_version != dir_version) { | |
1068 | dir_version = (long)READ_ONCE(dvnode->invalid_before); | |
1069 | if (de_version - dir_version < 0) | |
1070 | return -ECHILD; | |
1071 | } | |
1072 | ||
a0753c29 DH |
1073 | return 1; /* Still valid */ |
1074 | } | |
1075 | ||
1da177e4 LT |
1076 | /* |
1077 | * check that a dentry lookup hit has found a valid entry | |
1078 | * - NOTE! the hit can be a negative hit too, so we can't assume we have an | |
1079 | * inode | |
1da177e4 | 1080 | */ |
0b728e19 | 1081 | static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 | 1082 | { |
260a9803 | 1083 | struct afs_vnode *vnode, *dir; |
3f649ab7 | 1084 | struct afs_fid fid; |
1da177e4 | 1085 | struct dentry *parent; |
c435ee34 | 1086 | struct inode *inode; |
00d3b7a4 | 1087 | struct key *key; |
40fc8102 | 1088 | afs_dataversion_t dir_version, invalid_before; |
9dd0b82e | 1089 | long de_version; |
1da177e4 LT |
1090 | int ret; |
1091 | ||
0b728e19 | 1092 | if (flags & LOOKUP_RCU) |
a0753c29 | 1093 | return afs_d_revalidate_rcu(dentry); |
34286d66 | 1094 | |
c435ee34 DH |
1095 | if (d_really_is_positive(dentry)) { |
1096 | vnode = AFS_FS_I(d_inode(dentry)); | |
3b6492df | 1097 | _enter("{v={%llx:%llu} n=%pd fl=%lx},", |
a455589f | 1098 | vnode->fid.vid, vnode->fid.vnode, dentry, |
260a9803 | 1099 | vnode->flags); |
c435ee34 | 1100 | } else { |
a455589f | 1101 | _enter("{neg n=%pd}", dentry); |
c435ee34 | 1102 | } |
1da177e4 | 1103 | |
260a9803 | 1104 | key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); |
00d3b7a4 DH |
1105 | if (IS_ERR(key)) |
1106 | key = NULL; | |
1107 | ||
63d49d84 | 1108 | /* Hold the parent dentry so we can peer at it */ |
08e0e7c8 | 1109 | parent = dget_parent(dentry); |
2b0143b5 | 1110 | dir = AFS_FS_I(d_inode(parent)); |
1da177e4 | 1111 | |
260a9803 | 1112 | /* validate the parent directory */ |
c435ee34 | 1113 | afs_validate(dir, key); |
260a9803 DH |
1114 | |
1115 | if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { | |
a455589f | 1116 | _debug("%pd: parent dir deleted", dentry); |
63d49d84 | 1117 | goto not_found; |
1da177e4 LT |
1118 | } |
1119 | ||
a4ff7401 DH |
1120 | /* We only need to invalidate a dentry if the server's copy changed |
1121 | * behind our back. If we made the change, it's no problem. Note that | |
1122 | * on a 32-bit system, we only have 32 bits in the dentry to store the | |
1123 | * version. | |
1124 | */ | |
9dd0b82e | 1125 | dir_version = dir->status.data_version; |
a4ff7401 | 1126 | de_version = (long)dentry->d_fsdata; |
9dd0b82e | 1127 | if (de_version == (long)dir_version) |
5dc84855 | 1128 | goto out_valid_noupdate; |
a4ff7401 | 1129 | |
40fc8102 DH |
1130 | invalid_before = dir->invalid_before; |
1131 | if (de_version - (long)invalid_before >= 0) | |
a4ff7401 | 1132 | goto out_valid; |
1da177e4 | 1133 | |
260a9803 | 1134 | _debug("dir modified"); |
d55b4da4 | 1135 | afs_stat_v(dir, n_reval); |
260a9803 DH |
1136 | |
1137 | /* search the directory for this vnode */ | |
9dd0b82e | 1138 | ret = afs_do_lookup_one(&dir->vfs_inode, dentry, &fid, key, &dir_version); |
260a9803 DH |
1139 | switch (ret) { |
1140 | case 0: | |
1141 | /* the filename maps to something */ | |
2b0143b5 | 1142 | if (d_really_is_negative(dentry)) |
63d49d84 | 1143 | goto not_found; |
c435ee34 DH |
1144 | inode = d_inode(dentry); |
1145 | if (is_bad_inode(inode)) { | |
a455589f AV |
1146 | printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n", |
1147 | dentry); | |
63d49d84 | 1148 | goto not_found; |
1da177e4 LT |
1149 | } |
1150 | ||
c435ee34 DH |
1151 | vnode = AFS_FS_I(inode); |
1152 | ||
1da177e4 LT |
1153 | /* if the vnode ID has changed, then the dirent points to a |
1154 | * different file */ | |
08e0e7c8 | 1155 | if (fid.vnode != vnode->fid.vnode) { |
3b6492df | 1156 | _debug("%pd: dirent changed [%llu != %llu]", |
a455589f | 1157 | dentry, fid.vnode, |
08e0e7c8 | 1158 | vnode->fid.vnode); |
1da177e4 LT |
1159 | goto not_found; |
1160 | } | |
1161 | ||
1162 | /* if the vnode ID uniqifier has changed, then the file has | |
260a9803 DH |
1163 | * been deleted and replaced, and the original vnode ID has |
1164 | * been reused */ | |
08e0e7c8 | 1165 | if (fid.unique != vnode->fid.unique) { |
a455589f AV |
1166 | _debug("%pd: file deleted (uq %u -> %u I:%u)", |
1167 | dentry, fid.unique, | |
7a224228 | 1168 | vnode->fid.unique, |
c435ee34 | 1169 | vnode->vfs_inode.i_generation); |
260a9803 | 1170 | goto not_found; |
1da177e4 | 1171 | } |
260a9803 | 1172 | goto out_valid; |
08e0e7c8 | 1173 | |
260a9803 DH |
1174 | case -ENOENT: |
1175 | /* the filename is unknown */ | |
a455589f | 1176 | _debug("%pd: dirent not found", dentry); |
2b0143b5 | 1177 | if (d_really_is_positive(dentry)) |
260a9803 DH |
1178 | goto not_found; |
1179 | goto out_valid; | |
1da177e4 | 1180 | |
260a9803 | 1181 | default: |
a455589f AV |
1182 | _debug("failed to iterate dir %pd: %d", |
1183 | parent, ret); | |
63d49d84 | 1184 | goto not_found; |
08e0e7c8 DH |
1185 | } |
1186 | ||
ec26815a | 1187 | out_valid: |
9dd0b82e | 1188 | dentry->d_fsdata = (void *)(unsigned long)dir_version; |
5dc84855 | 1189 | out_valid_noupdate: |
1da177e4 | 1190 | dput(parent); |
00d3b7a4 | 1191 | key_put(key); |
1da177e4 LT |
1192 | _leave(" = 1 [valid]"); |
1193 | return 1; | |
1194 | ||
ec26815a | 1195 | not_found: |
a455589f | 1196 | _debug("dropping dentry %pd2", dentry); |
1da177e4 | 1197 | dput(parent); |
00d3b7a4 | 1198 | key_put(key); |
1da177e4 LT |
1199 | |
1200 | _leave(" = 0 [bad]"); | |
1201 | return 0; | |
ec26815a | 1202 | } |
1da177e4 | 1203 | |
1da177e4 LT |
1204 | /* |
1205 | * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't | |
1206 | * sleep) | |
1207 | * - called from dput() when d_count is going to 0. | |
1208 | * - return 1 to request dentry be unhashed, 0 otherwise | |
1209 | */ | |
fe15ce44 | 1210 | static int afs_d_delete(const struct dentry *dentry) |
1da177e4 | 1211 | { |
a455589f | 1212 | _enter("%pd", dentry); |
1da177e4 LT |
1213 | |
1214 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1215 | goto zap; | |
1216 | ||
2b0143b5 DH |
1217 | if (d_really_is_positive(dentry) && |
1218 | (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) || | |
1219 | test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags))) | |
bec5eb61 | 1220 | goto zap; |
1da177e4 LT |
1221 | |
1222 | _leave(" = 0 [keep]"); | |
1223 | return 0; | |
1224 | ||
ec26815a | 1225 | zap: |
1da177e4 LT |
1226 | _leave(" = 1 [zap]"); |
1227 | return 1; | |
ec26815a | 1228 | } |
260a9803 | 1229 | |
79ddbfa5 DH |
1230 | /* |
1231 | * Clean up sillyrename files on dentry removal. | |
1232 | */ | |
1233 | static void afs_d_iput(struct dentry *dentry, struct inode *inode) | |
1234 | { | |
1235 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1236 | afs_silly_iput(dentry, inode); | |
1237 | iput(inode); | |
1238 | } | |
1239 | ||
260a9803 DH |
1240 | /* |
1241 | * handle dentry release | |
1242 | */ | |
66c7e1d3 | 1243 | void afs_d_release(struct dentry *dentry) |
260a9803 | 1244 | { |
a455589f | 1245 | _enter("%pd", dentry); |
260a9803 DH |
1246 | } |
1247 | ||
728279a5 DH |
1248 | void afs_check_for_remote_deletion(struct afs_operation *op) |
1249 | { | |
1250 | struct afs_vnode *vnode = op->file[0].vnode; | |
1251 | ||
1252 | switch (op->ac.abort_code) { | |
1253 | case VNOVNODE: | |
1254 | set_bit(AFS_VNODE_DELETED, &vnode->flags); | |
1255 | afs_break_callback(vnode, afs_cb_break_for_deleted); | |
1256 | } | |
1257 | } | |
1258 | ||
d2ddc776 DH |
1259 | /* |
1260 | * Create a new inode for create/mkdir/symlink | |
1261 | */ | |
e49c7b2f | 1262 | static void afs_vnode_new_inode(struct afs_operation *op) |
d2ddc776 | 1263 | { |
e49c7b2f | 1264 | struct afs_vnode_param *vp = &op->file[1]; |
5a813276 | 1265 | struct afs_vnode *vnode; |
d2ddc776 DH |
1266 | struct inode *inode; |
1267 | ||
e49c7b2f DH |
1268 | _enter(""); |
1269 | ||
1270 | ASSERTCMP(op->error, ==, 0); | |
d2ddc776 | 1271 | |
e49c7b2f | 1272 | inode = afs_iget(op, vp); |
d2ddc776 DH |
1273 | if (IS_ERR(inode)) { |
1274 | /* ENOMEM or EINTR at a really inconvenient time - just abandon | |
1275 | * the new directory on the server. | |
1276 | */ | |
e49c7b2f | 1277 | op->error = PTR_ERR(inode); |
d2ddc776 DH |
1278 | return; |
1279 | } | |
1280 | ||
5a813276 DH |
1281 | vnode = AFS_FS_I(inode); |
1282 | set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags); | |
e49c7b2f DH |
1283 | if (!op->error) |
1284 | afs_cache_permit(vnode, op->key, vnode->cb_break, &vp->scb); | |
1285 | d_instantiate(op->dentry, inode); | |
d2ddc776 DH |
1286 | } |
1287 | ||
e49c7b2f | 1288 | static void afs_create_success(struct afs_operation *op) |
b8359153 | 1289 | { |
e49c7b2f | 1290 | _enter("op=%08x", op->debug_id); |
da8d0755 | 1291 | op->ctime = op->file[0].scb.status.mtime_client; |
e49c7b2f DH |
1292 | afs_vnode_commit_status(op, &op->file[0]); |
1293 | afs_update_dentry_version(op, &op->file[0], op->dentry); | |
1294 | afs_vnode_new_inode(op); | |
b8359153 DH |
1295 | } |
1296 | ||
e49c7b2f | 1297 | static void afs_create_edit_dir(struct afs_operation *op) |
9dd0b82e | 1298 | { |
e49c7b2f DH |
1299 | struct afs_vnode_param *dvp = &op->file[0]; |
1300 | struct afs_vnode_param *vp = &op->file[1]; | |
1301 | struct afs_vnode *dvnode = dvp->vnode; | |
1302 | ||
1303 | _enter("op=%08x", op->debug_id); | |
1304 | ||
1305 | down_write(&dvnode->validate_lock); | |
1306 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) && | |
1307 | dvnode->status.data_version == dvp->dv_before + dvp->dv_delta) | |
1308 | afs_edit_dir_add(dvnode, &op->dentry->d_name, &vp->fid, | |
1309 | op->create.reason); | |
1310 | up_write(&dvnode->validate_lock); | |
9dd0b82e DH |
1311 | } |
1312 | ||
e49c7b2f DH |
1313 | static void afs_create_put(struct afs_operation *op) |
1314 | { | |
1315 | _enter("op=%08x", op->debug_id); | |
1316 | ||
1317 | if (op->error) | |
1318 | d_drop(op->dentry); | |
1319 | } | |
1320 | ||
1321 | static const struct afs_operation_ops afs_mkdir_operation = { | |
1322 | .issue_afs_rpc = afs_fs_make_dir, | |
1323 | .issue_yfs_rpc = yfs_fs_make_dir, | |
1324 | .success = afs_create_success, | |
728279a5 | 1325 | .aborted = afs_check_for_remote_deletion, |
e49c7b2f DH |
1326 | .edit_dir = afs_create_edit_dir, |
1327 | .put = afs_create_put, | |
1328 | }; | |
1329 | ||
260a9803 DH |
1330 | /* |
1331 | * create a directory on an AFS filesystem | |
1332 | */ | |
549c7297 CB |
1333 | static int afs_mkdir(struct user_namespace *mnt_userns, struct inode *dir, |
1334 | struct dentry *dentry, umode_t mode) | |
260a9803 | 1335 | { |
e49c7b2f | 1336 | struct afs_operation *op; |
d2ddc776 | 1337 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
260a9803 | 1338 | |
3b6492df | 1339 | _enter("{%llx:%llu},{%pd},%ho", |
a455589f | 1340 | dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); |
260a9803 | 1341 | |
e49c7b2f DH |
1342 | op = afs_alloc_operation(NULL, dvnode->volume); |
1343 | if (IS_ERR(op)) { | |
1344 | d_drop(dentry); | |
1345 | return PTR_ERR(op); | |
2105c282 | 1346 | } |
63a4681f | 1347 | |
e49c7b2f DH |
1348 | afs_op_set_vnode(op, 0, dvnode); |
1349 | op->file[0].dv_delta = 1; | |
22650f14 | 1350 | op->file[0].modification = true; |
da8d0755 | 1351 | op->file[0].update_ctime = true; |
e49c7b2f DH |
1352 | op->dentry = dentry; |
1353 | op->create.mode = S_IFDIR | mode; | |
1354 | op->create.reason = afs_edit_dir_for_mkdir; | |
1355 | op->ops = &afs_mkdir_operation; | |
1356 | return afs_do_sync_operation(op); | |
260a9803 DH |
1357 | } |
1358 | ||
d2ddc776 DH |
1359 | /* |
1360 | * Remove a subdir from a directory. | |
1361 | */ | |
1362 | static void afs_dir_remove_subdir(struct dentry *dentry) | |
1363 | { | |
1364 | if (d_really_is_positive(dentry)) { | |
1365 | struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); | |
1366 | ||
1367 | clear_nlink(&vnode->vfs_inode); | |
1368 | set_bit(AFS_VNODE_DELETED, &vnode->flags); | |
1369 | clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); | |
63a4681f | 1370 | clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags); |
d2ddc776 DH |
1371 | } |
1372 | } | |
1373 | ||
e49c7b2f DH |
1374 | static void afs_rmdir_success(struct afs_operation *op) |
1375 | { | |
1376 | _enter("op=%08x", op->debug_id); | |
da8d0755 | 1377 | op->ctime = op->file[0].scb.status.mtime_client; |
e49c7b2f DH |
1378 | afs_vnode_commit_status(op, &op->file[0]); |
1379 | afs_update_dentry_version(op, &op->file[0], op->dentry); | |
1380 | } | |
1381 | ||
1382 | static void afs_rmdir_edit_dir(struct afs_operation *op) | |
1383 | { | |
1384 | struct afs_vnode_param *dvp = &op->file[0]; | |
1385 | struct afs_vnode *dvnode = dvp->vnode; | |
1386 | ||
1387 | _enter("op=%08x", op->debug_id); | |
1388 | afs_dir_remove_subdir(op->dentry); | |
1389 | ||
1390 | down_write(&dvnode->validate_lock); | |
1391 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) && | |
1392 | dvnode->status.data_version == dvp->dv_before + dvp->dv_delta) | |
1393 | afs_edit_dir_remove(dvnode, &op->dentry->d_name, | |
1394 | afs_edit_dir_for_rmdir); | |
1395 | up_write(&dvnode->validate_lock); | |
1396 | } | |
1397 | ||
1398 | static void afs_rmdir_put(struct afs_operation *op) | |
1399 | { | |
1400 | _enter("op=%08x", op->debug_id); | |
1401 | if (op->file[1].vnode) | |
1402 | up_write(&op->file[1].vnode->rmdir_lock); | |
1403 | } | |
1404 | ||
1405 | static const struct afs_operation_ops afs_rmdir_operation = { | |
1406 | .issue_afs_rpc = afs_fs_remove_dir, | |
1407 | .issue_yfs_rpc = yfs_fs_remove_dir, | |
1408 | .success = afs_rmdir_success, | |
728279a5 | 1409 | .aborted = afs_check_for_remote_deletion, |
e49c7b2f DH |
1410 | .edit_dir = afs_rmdir_edit_dir, |
1411 | .put = afs_rmdir_put, | |
1412 | }; | |
1413 | ||
260a9803 DH |
1414 | /* |
1415 | * remove a directory from an AFS filesystem | |
1416 | */ | |
1417 | static int afs_rmdir(struct inode *dir, struct dentry *dentry) | |
1418 | { | |
e49c7b2f | 1419 | struct afs_operation *op; |
f58db83f | 1420 | struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL; |
260a9803 DH |
1421 | int ret; |
1422 | ||
3b6492df | 1423 | _enter("{%llx:%llu},{%pd}", |
a455589f | 1424 | dvnode->fid.vid, dvnode->fid.vnode, dentry); |
260a9803 | 1425 | |
e49c7b2f DH |
1426 | op = afs_alloc_operation(NULL, dvnode->volume); |
1427 | if (IS_ERR(op)) | |
1428 | return PTR_ERR(op); | |
a58823ac | 1429 | |
e49c7b2f DH |
1430 | afs_op_set_vnode(op, 0, dvnode); |
1431 | op->file[0].dv_delta = 1; | |
22650f14 | 1432 | op->file[0].modification = true; |
da8d0755 | 1433 | op->file[0].update_ctime = true; |
e49c7b2f DH |
1434 | |
1435 | op->dentry = dentry; | |
1436 | op->ops = &afs_rmdir_operation; | |
260a9803 | 1437 | |
f58db83f DH |
1438 | /* Try to make sure we have a callback promise on the victim. */ |
1439 | if (d_really_is_positive(dentry)) { | |
1440 | vnode = AFS_FS_I(d_inode(dentry)); | |
e49c7b2f | 1441 | ret = afs_validate(vnode, op->key); |
f58db83f | 1442 | if (ret < 0) |
e49c7b2f | 1443 | goto error; |
f58db83f DH |
1444 | } |
1445 | ||
79ddbfa5 DH |
1446 | if (vnode) { |
1447 | ret = down_write_killable(&vnode->rmdir_lock); | |
1448 | if (ret < 0) | |
e49c7b2f DH |
1449 | goto error; |
1450 | op->file[1].vnode = vnode; | |
79ddbfa5 DH |
1451 | } |
1452 | ||
e49c7b2f | 1453 | return afs_do_sync_operation(op); |
260a9803 | 1454 | |
260a9803 | 1455 | error: |
e49c7b2f | 1456 | return afs_put_operation(op); |
260a9803 DH |
1457 | } |
1458 | ||
1459 | /* | |
d2ddc776 DH |
1460 | * Remove a link to a file or symlink from a directory. |
1461 | * | |
1462 | * If the file was not deleted due to excess hard links, the fileserver will | |
1463 | * break the callback promise on the file - if it had one - before it returns | |
1464 | * to us, and if it was deleted, it won't | |
1465 | * | |
1466 | * However, if we didn't have a callback promise outstanding, or it was | |
1467 | * outstanding on a different server, then it won't break it either... | |
1468 | */ | |
e49c7b2f | 1469 | static void afs_dir_remove_link(struct afs_operation *op) |
d2ddc776 | 1470 | { |
e49c7b2f DH |
1471 | struct afs_vnode *dvnode = op->file[0].vnode; |
1472 | struct afs_vnode *vnode = op->file[1].vnode; | |
1473 | struct dentry *dentry = op->dentry; | |
1474 | int ret; | |
d2ddc776 | 1475 | |
e49c7b2f DH |
1476 | if (op->error != 0 || |
1477 | (op->file[1].scb.have_status && op->file[1].scb.have_error)) | |
1478 | return; | |
1479 | if (d_really_is_positive(dentry)) | |
1480 | return; | |
d2ddc776 | 1481 | |
e49c7b2f DH |
1482 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { |
1483 | /* Already done */ | |
1484 | } else if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { | |
1485 | write_seqlock(&vnode->cb_lock); | |
1486 | drop_nlink(&vnode->vfs_inode); | |
1487 | if (vnode->vfs_inode.i_nlink == 0) { | |
1488 | set_bit(AFS_VNODE_DELETED, &vnode->flags); | |
1489 | __afs_break_callback(vnode, afs_cb_break_for_unlink); | |
1490 | } | |
1491 | write_sequnlock(&vnode->cb_lock); | |
1492 | } else { | |
1493 | afs_break_callback(vnode, afs_cb_break_for_unlink); | |
440fbc3a | 1494 | |
e49c7b2f DH |
1495 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) |
1496 | _debug("AFS_VNODE_DELETED"); | |
440fbc3a | 1497 | |
e49c7b2f DH |
1498 | ret = afs_validate(vnode, op->key); |
1499 | if (ret != -ESTALE) | |
1500 | op->error = ret; | |
d2ddc776 DH |
1501 | } |
1502 | ||
e49c7b2f DH |
1503 | _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, op->error); |
1504 | } | |
1505 | ||
1506 | static void afs_unlink_success(struct afs_operation *op) | |
1507 | { | |
1508 | _enter("op=%08x", op->debug_id); | |
da8d0755 | 1509 | op->ctime = op->file[0].scb.status.mtime_client; |
b6489a49 | 1510 | afs_check_dir_conflict(op, &op->file[0]); |
e49c7b2f DH |
1511 | afs_vnode_commit_status(op, &op->file[0]); |
1512 | afs_vnode_commit_status(op, &op->file[1]); | |
1513 | afs_update_dentry_version(op, &op->file[0], op->dentry); | |
1514 | afs_dir_remove_link(op); | |
1515 | } | |
1516 | ||
1517 | static void afs_unlink_edit_dir(struct afs_operation *op) | |
1518 | { | |
1519 | struct afs_vnode_param *dvp = &op->file[0]; | |
1520 | struct afs_vnode *dvnode = dvp->vnode; | |
1521 | ||
1522 | _enter("op=%08x", op->debug_id); | |
1523 | down_write(&dvnode->validate_lock); | |
1524 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) && | |
1525 | dvnode->status.data_version == dvp->dv_before + dvp->dv_delta) | |
1526 | afs_edit_dir_remove(dvnode, &op->dentry->d_name, | |
1527 | afs_edit_dir_for_unlink); | |
1528 | up_write(&dvnode->validate_lock); | |
d2ddc776 DH |
1529 | } |
1530 | ||
e49c7b2f DH |
1531 | static void afs_unlink_put(struct afs_operation *op) |
1532 | { | |
1533 | _enter("op=%08x", op->debug_id); | |
1534 | if (op->unlink.need_rehash && op->error < 0 && op->error != -ENOENT) | |
1535 | d_rehash(op->dentry); | |
1536 | } | |
1537 | ||
1538 | static const struct afs_operation_ops afs_unlink_operation = { | |
1539 | .issue_afs_rpc = afs_fs_remove_file, | |
1540 | .issue_yfs_rpc = yfs_fs_remove_file, | |
1541 | .success = afs_unlink_success, | |
728279a5 | 1542 | .aborted = afs_check_for_remote_deletion, |
e49c7b2f DH |
1543 | .edit_dir = afs_unlink_edit_dir, |
1544 | .put = afs_unlink_put, | |
1545 | }; | |
1546 | ||
d2ddc776 DH |
1547 | /* |
1548 | * Remove a file or symlink from an AFS filesystem. | |
260a9803 DH |
1549 | */ |
1550 | static int afs_unlink(struct inode *dir, struct dentry *dentry) | |
1551 | { | |
e49c7b2f | 1552 | struct afs_operation *op; |
fa59f52f DH |
1553 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
1554 | struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); | |
260a9803 DH |
1555 | int ret; |
1556 | ||
3b6492df | 1557 | _enter("{%llx:%llu},{%pd}", |
a455589f | 1558 | dvnode->fid.vid, dvnode->fid.vnode, dentry); |
260a9803 | 1559 | |
45222b9e | 1560 | if (dentry->d_name.len >= AFSNAMEMAX) |
d2ddc776 | 1561 | return -ENAMETOOLONG; |
260a9803 | 1562 | |
e49c7b2f DH |
1563 | op = afs_alloc_operation(NULL, dvnode->volume); |
1564 | if (IS_ERR(op)) | |
1565 | return PTR_ERR(op); | |
a58823ac | 1566 | |
e49c7b2f DH |
1567 | afs_op_set_vnode(op, 0, dvnode); |
1568 | op->file[0].dv_delta = 1; | |
22650f14 | 1569 | op->file[0].modification = true; |
da8d0755 | 1570 | op->file[0].update_ctime = true; |
260a9803 | 1571 | |
d2ddc776 | 1572 | /* Try to make sure we have a callback promise on the victim. */ |
e49c7b2f DH |
1573 | ret = afs_validate(vnode, op->key); |
1574 | if (ret < 0) { | |
1575 | op->error = ret; | |
1576 | goto error; | |
1577 | } | |
260a9803 | 1578 | |
79ddbfa5 | 1579 | spin_lock(&dentry->d_lock); |
fa59f52f | 1580 | if (d_count(dentry) > 1) { |
79ddbfa5 DH |
1581 | spin_unlock(&dentry->d_lock); |
1582 | /* Start asynchronous writeout of the inode */ | |
1583 | write_inode_now(d_inode(dentry), 0); | |
e49c7b2f DH |
1584 | op->error = afs_sillyrename(dvnode, vnode, dentry, op->key); |
1585 | goto error; | |
79ddbfa5 DH |
1586 | } |
1587 | if (!d_unhashed(dentry)) { | |
1588 | /* Prevent a race with RCU lookup. */ | |
1589 | __d_drop(dentry); | |
e49c7b2f | 1590 | op->unlink.need_rehash = true; |
79ddbfa5 DH |
1591 | } |
1592 | spin_unlock(&dentry->d_lock); | |
1593 | ||
e49c7b2f | 1594 | op->file[1].vnode = vnode; |
da8d0755 | 1595 | op->file[1].update_ctime = true; |
b6489a49 | 1596 | op->file[1].op_unlinked = true; |
e49c7b2f DH |
1597 | op->dentry = dentry; |
1598 | op->ops = &afs_unlink_operation; | |
b6489a49 DH |
1599 | afs_begin_vnode_operation(op); |
1600 | afs_wait_for_operation(op); | |
1601 | ||
1602 | /* If there was a conflict with a third party, check the status of the | |
1603 | * unlinked vnode. | |
1604 | */ | |
1605 | if (op->error == 0 && (op->flags & AFS_OPERATION_DIR_CONFLICT)) { | |
1606 | op->file[1].update_ctime = false; | |
1607 | op->fetch_status.which = 1; | |
1608 | op->ops = &afs_fetch_status_operation; | |
1609 | afs_begin_vnode_operation(op); | |
1610 | afs_wait_for_operation(op); | |
1611 | } | |
1612 | ||
1613 | return afs_put_operation(op); | |
79ddbfa5 | 1614 | |
260a9803 | 1615 | error: |
e49c7b2f | 1616 | return afs_put_operation(op); |
260a9803 DH |
1617 | } |
1618 | ||
e49c7b2f DH |
1619 | static const struct afs_operation_ops afs_create_operation = { |
1620 | .issue_afs_rpc = afs_fs_create_file, | |
1621 | .issue_yfs_rpc = yfs_fs_create_file, | |
1622 | .success = afs_create_success, | |
728279a5 | 1623 | .aborted = afs_check_for_remote_deletion, |
e49c7b2f DH |
1624 | .edit_dir = afs_create_edit_dir, |
1625 | .put = afs_create_put, | |
1626 | }; | |
1627 | ||
260a9803 DH |
1628 | /* |
1629 | * create a regular file on an AFS filesystem | |
1630 | */ | |
549c7297 CB |
1631 | static int afs_create(struct user_namespace *mnt_userns, struct inode *dir, |
1632 | struct dentry *dentry, umode_t mode, bool excl) | |
260a9803 | 1633 | { |
e49c7b2f | 1634 | struct afs_operation *op; |
43dd388b | 1635 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
e49c7b2f | 1636 | int ret = -ENAMETOOLONG; |
260a9803 | 1637 | |
e49c7b2f | 1638 | _enter("{%llx:%llu},{%pd},%ho", |
a455589f | 1639 | dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); |
260a9803 | 1640 | |
d2ddc776 DH |
1641 | if (dentry->d_name.len >= AFSNAMEMAX) |
1642 | goto error; | |
1643 | ||
e49c7b2f DH |
1644 | op = afs_alloc_operation(NULL, dvnode->volume); |
1645 | if (IS_ERR(op)) { | |
1646 | ret = PTR_ERR(op); | |
260a9803 DH |
1647 | goto error; |
1648 | } | |
1649 | ||
e49c7b2f DH |
1650 | afs_op_set_vnode(op, 0, dvnode); |
1651 | op->file[0].dv_delta = 1; | |
22650f14 | 1652 | op->file[0].modification = true; |
da8d0755 | 1653 | op->file[0].update_ctime = true; |
63a4681f | 1654 | |
e49c7b2f DH |
1655 | op->dentry = dentry; |
1656 | op->create.mode = S_IFREG | mode; | |
1657 | op->create.reason = afs_edit_dir_for_create; | |
1658 | op->ops = &afs_create_operation; | |
1659 | return afs_do_sync_operation(op); | |
260a9803 | 1660 | |
260a9803 DH |
1661 | error: |
1662 | d_drop(dentry); | |
1663 | _leave(" = %d", ret); | |
1664 | return ret; | |
1665 | } | |
1666 | ||
e49c7b2f DH |
1667 | static void afs_link_success(struct afs_operation *op) |
1668 | { | |
1669 | struct afs_vnode_param *dvp = &op->file[0]; | |
1670 | struct afs_vnode_param *vp = &op->file[1]; | |
1671 | ||
1672 | _enter("op=%08x", op->debug_id); | |
da8d0755 | 1673 | op->ctime = dvp->scb.status.mtime_client; |
e49c7b2f DH |
1674 | afs_vnode_commit_status(op, dvp); |
1675 | afs_vnode_commit_status(op, vp); | |
1676 | afs_update_dentry_version(op, dvp, op->dentry); | |
1677 | if (op->dentry_2->d_parent == op->dentry->d_parent) | |
1678 | afs_update_dentry_version(op, dvp, op->dentry_2); | |
1679 | ihold(&vp->vnode->vfs_inode); | |
1680 | d_instantiate(op->dentry, &vp->vnode->vfs_inode); | |
1681 | } | |
1682 | ||
1683 | static void afs_link_put(struct afs_operation *op) | |
1684 | { | |
1685 | _enter("op=%08x", op->debug_id); | |
1686 | if (op->error) | |
1687 | d_drop(op->dentry); | |
1688 | } | |
1689 | ||
1690 | static const struct afs_operation_ops afs_link_operation = { | |
1691 | .issue_afs_rpc = afs_fs_link, | |
1692 | .issue_yfs_rpc = yfs_fs_link, | |
1693 | .success = afs_link_success, | |
728279a5 | 1694 | .aborted = afs_check_for_remote_deletion, |
e49c7b2f DH |
1695 | .edit_dir = afs_create_edit_dir, |
1696 | .put = afs_link_put, | |
1697 | }; | |
1698 | ||
260a9803 DH |
1699 | /* |
1700 | * create a hard link between files in an AFS filesystem | |
1701 | */ | |
1702 | static int afs_link(struct dentry *from, struct inode *dir, | |
1703 | struct dentry *dentry) | |
1704 | { | |
e49c7b2f | 1705 | struct afs_operation *op; |
a58823ac DH |
1706 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
1707 | struct afs_vnode *vnode = AFS_FS_I(d_inode(from)); | |
e49c7b2f | 1708 | int ret = -ENAMETOOLONG; |
260a9803 | 1709 | |
3b6492df | 1710 | _enter("{%llx:%llu},{%llx:%llu},{%pd}", |
260a9803 DH |
1711 | vnode->fid.vid, vnode->fid.vnode, |
1712 | dvnode->fid.vid, dvnode->fid.vnode, | |
a455589f | 1713 | dentry); |
260a9803 | 1714 | |
d2ddc776 DH |
1715 | if (dentry->d_name.len >= AFSNAMEMAX) |
1716 | goto error; | |
1717 | ||
e49c7b2f DH |
1718 | op = afs_alloc_operation(NULL, dvnode->volume); |
1719 | if (IS_ERR(op)) { | |
1720 | ret = PTR_ERR(op); | |
a58823ac | 1721 | goto error; |
260a9803 DH |
1722 | } |
1723 | ||
3978d816 DH |
1724 | ret = afs_validate(vnode, op->key); |
1725 | if (ret < 0) | |
1726 | goto error_op; | |
1727 | ||
e49c7b2f DH |
1728 | afs_op_set_vnode(op, 0, dvnode); |
1729 | afs_op_set_vnode(op, 1, vnode); | |
1730 | op->file[0].dv_delta = 1; | |
22650f14 | 1731 | op->file[0].modification = true; |
da8d0755 DH |
1732 | op->file[0].update_ctime = true; |
1733 | op->file[1].update_ctime = true; | |
260a9803 | 1734 | |
e49c7b2f DH |
1735 | op->dentry = dentry; |
1736 | op->dentry_2 = from; | |
1737 | op->ops = &afs_link_operation; | |
1738 | op->create.reason = afs_edit_dir_for_link; | |
1739 | return afs_do_sync_operation(op); | |
63a4681f | 1740 | |
3978d816 DH |
1741 | error_op: |
1742 | afs_put_operation(op); | |
260a9803 DH |
1743 | error: |
1744 | d_drop(dentry); | |
1745 | _leave(" = %d", ret); | |
1746 | return ret; | |
1747 | } | |
1748 | ||
e49c7b2f DH |
1749 | static const struct afs_operation_ops afs_symlink_operation = { |
1750 | .issue_afs_rpc = afs_fs_symlink, | |
1751 | .issue_yfs_rpc = yfs_fs_symlink, | |
1752 | .success = afs_create_success, | |
728279a5 | 1753 | .aborted = afs_check_for_remote_deletion, |
e49c7b2f DH |
1754 | .edit_dir = afs_create_edit_dir, |
1755 | .put = afs_create_put, | |
1756 | }; | |
1757 | ||
260a9803 DH |
1758 | /* |
1759 | * create a symlink in an AFS filesystem | |
1760 | */ | |
549c7297 CB |
1761 | static int afs_symlink(struct user_namespace *mnt_userns, struct inode *dir, |
1762 | struct dentry *dentry, const char *content) | |
260a9803 | 1763 | { |
e49c7b2f | 1764 | struct afs_operation *op; |
d2ddc776 | 1765 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
260a9803 DH |
1766 | int ret; |
1767 | ||
3b6492df | 1768 | _enter("{%llx:%llu},{%pd},%s", |
a455589f | 1769 | dvnode->fid.vid, dvnode->fid.vnode, dentry, |
260a9803 DH |
1770 | content); |
1771 | ||
d2ddc776 DH |
1772 | ret = -ENAMETOOLONG; |
1773 | if (dentry->d_name.len >= AFSNAMEMAX) | |
1774 | goto error; | |
1775 | ||
260a9803 | 1776 | ret = -EINVAL; |
45222b9e | 1777 | if (strlen(content) >= AFSPATHMAX) |
260a9803 DH |
1778 | goto error; |
1779 | ||
e49c7b2f DH |
1780 | op = afs_alloc_operation(NULL, dvnode->volume); |
1781 | if (IS_ERR(op)) { | |
1782 | ret = PTR_ERR(op); | |
a58823ac | 1783 | goto error; |
260a9803 DH |
1784 | } |
1785 | ||
e49c7b2f DH |
1786 | afs_op_set_vnode(op, 0, dvnode); |
1787 | op->file[0].dv_delta = 1; | |
260a9803 | 1788 | |
e49c7b2f DH |
1789 | op->dentry = dentry; |
1790 | op->ops = &afs_symlink_operation; | |
1791 | op->create.reason = afs_edit_dir_for_symlink; | |
1792 | op->create.symlink = content; | |
1793 | return afs_do_sync_operation(op); | |
260a9803 | 1794 | |
260a9803 DH |
1795 | error: |
1796 | d_drop(dentry); | |
1797 | _leave(" = %d", ret); | |
1798 | return ret; | |
1799 | } | |
1800 | ||
e49c7b2f DH |
1801 | static void afs_rename_success(struct afs_operation *op) |
1802 | { | |
1803 | _enter("op=%08x", op->debug_id); | |
1804 | ||
da8d0755 | 1805 | op->ctime = op->file[0].scb.status.mtime_client; |
b6489a49 | 1806 | afs_check_dir_conflict(op, &op->file[1]); |
e49c7b2f | 1807 | afs_vnode_commit_status(op, &op->file[0]); |
da8d0755 DH |
1808 | if (op->file[1].vnode != op->file[0].vnode) { |
1809 | op->ctime = op->file[1].scb.status.mtime_client; | |
e49c7b2f | 1810 | afs_vnode_commit_status(op, &op->file[1]); |
da8d0755 | 1811 | } |
e49c7b2f DH |
1812 | } |
1813 | ||
1814 | static void afs_rename_edit_dir(struct afs_operation *op) | |
1815 | { | |
1816 | struct afs_vnode_param *orig_dvp = &op->file[0]; | |
1817 | struct afs_vnode_param *new_dvp = &op->file[1]; | |
1818 | struct afs_vnode *orig_dvnode = orig_dvp->vnode; | |
1819 | struct afs_vnode *new_dvnode = new_dvp->vnode; | |
1820 | struct afs_vnode *vnode = AFS_FS_I(d_inode(op->dentry)); | |
1821 | struct dentry *old_dentry = op->dentry; | |
1822 | struct dentry *new_dentry = op->dentry_2; | |
1823 | struct inode *new_inode; | |
1824 | ||
1825 | _enter("op=%08x", op->debug_id); | |
1826 | ||
1827 | if (op->rename.rehash) { | |
1828 | d_rehash(op->rename.rehash); | |
1829 | op->rename.rehash = NULL; | |
1830 | } | |
1831 | ||
1832 | down_write(&orig_dvnode->validate_lock); | |
1833 | if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags) && | |
1834 | orig_dvnode->status.data_version == orig_dvp->dv_before + orig_dvp->dv_delta) | |
1835 | afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name, | |
1836 | afs_edit_dir_for_rename_0); | |
1837 | ||
1838 | if (new_dvnode != orig_dvnode) { | |
1839 | up_write(&orig_dvnode->validate_lock); | |
1840 | down_write(&new_dvnode->validate_lock); | |
1841 | } | |
1842 | ||
1843 | if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags) && | |
1844 | new_dvnode->status.data_version == new_dvp->dv_before + new_dvp->dv_delta) { | |
1845 | if (!op->rename.new_negative) | |
1846 | afs_edit_dir_remove(new_dvnode, &new_dentry->d_name, | |
1847 | afs_edit_dir_for_rename_1); | |
1848 | ||
1849 | afs_edit_dir_add(new_dvnode, &new_dentry->d_name, | |
1850 | &vnode->fid, afs_edit_dir_for_rename_2); | |
1851 | } | |
1852 | ||
1853 | new_inode = d_inode(new_dentry); | |
1854 | if (new_inode) { | |
1855 | spin_lock(&new_inode->i_lock); | |
f610a5a2 DH |
1856 | if (S_ISDIR(new_inode->i_mode)) |
1857 | clear_nlink(new_inode); | |
1858 | else if (new_inode->i_nlink > 0) | |
e49c7b2f DH |
1859 | drop_nlink(new_inode); |
1860 | spin_unlock(&new_inode->i_lock); | |
1861 | } | |
1862 | ||
1863 | /* Now we can update d_fsdata on the dentries to reflect their | |
1864 | * new parent's data_version. | |
1865 | * | |
1866 | * Note that if we ever implement RENAME_EXCHANGE, we'll have | |
1867 | * to update both dentries with opposing dir versions. | |
1868 | */ | |
1869 | afs_update_dentry_version(op, new_dvp, op->dentry); | |
1870 | afs_update_dentry_version(op, new_dvp, op->dentry_2); | |
1871 | ||
1872 | d_move(old_dentry, new_dentry); | |
1873 | ||
1874 | up_write(&new_dvnode->validate_lock); | |
1875 | } | |
1876 | ||
1877 | static void afs_rename_put(struct afs_operation *op) | |
1878 | { | |
1879 | _enter("op=%08x", op->debug_id); | |
1880 | if (op->rename.rehash) | |
1881 | d_rehash(op->rename.rehash); | |
1882 | dput(op->rename.tmp); | |
1883 | if (op->error) | |
1884 | d_rehash(op->dentry); | |
1885 | } | |
1886 | ||
1887 | static const struct afs_operation_ops afs_rename_operation = { | |
1888 | .issue_afs_rpc = afs_fs_rename, | |
1889 | .issue_yfs_rpc = yfs_fs_rename, | |
1890 | .success = afs_rename_success, | |
1891 | .edit_dir = afs_rename_edit_dir, | |
1892 | .put = afs_rename_put, | |
1893 | }; | |
1894 | ||
260a9803 DH |
1895 | /* |
1896 | * rename a file in an AFS filesystem and/or move it between directories | |
1897 | */ | |
549c7297 CB |
1898 | static int afs_rename(struct user_namespace *mnt_userns, struct inode *old_dir, |
1899 | struct dentry *old_dentry, struct inode *new_dir, | |
1900 | struct dentry *new_dentry, unsigned int flags) | |
260a9803 | 1901 | { |
e49c7b2f | 1902 | struct afs_operation *op; |
260a9803 | 1903 | struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; |
260a9803 DH |
1904 | int ret; |
1905 | ||
1cd66c93 MS |
1906 | if (flags) |
1907 | return -EINVAL; | |
1908 | ||
79ddbfa5 DH |
1909 | /* Don't allow silly-rename files be moved around. */ |
1910 | if (old_dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1911 | return -EINVAL; | |
1912 | ||
2b0143b5 | 1913 | vnode = AFS_FS_I(d_inode(old_dentry)); |
260a9803 DH |
1914 | orig_dvnode = AFS_FS_I(old_dir); |
1915 | new_dvnode = AFS_FS_I(new_dir); | |
1916 | ||
3b6492df | 1917 | _enter("{%llx:%llu},{%llx:%llu},{%llx:%llu},{%pd}", |
260a9803 DH |
1918 | orig_dvnode->fid.vid, orig_dvnode->fid.vnode, |
1919 | vnode->fid.vid, vnode->fid.vnode, | |
1920 | new_dvnode->fid.vid, new_dvnode->fid.vnode, | |
a455589f | 1921 | new_dentry); |
260a9803 | 1922 | |
e49c7b2f DH |
1923 | op = afs_alloc_operation(NULL, orig_dvnode->volume); |
1924 | if (IS_ERR(op)) | |
1925 | return PTR_ERR(op); | |
a58823ac | 1926 | |
3978d816 DH |
1927 | ret = afs_validate(vnode, op->key); |
1928 | op->error = ret; | |
1929 | if (ret < 0) | |
1930 | goto error; | |
1931 | ||
e49c7b2f DH |
1932 | afs_op_set_vnode(op, 0, orig_dvnode); |
1933 | afs_op_set_vnode(op, 1, new_dvnode); /* May be same as orig_dvnode */ | |
1934 | op->file[0].dv_delta = 1; | |
1935 | op->file[1].dv_delta = 1; | |
22650f14 DH |
1936 | op->file[0].modification = true; |
1937 | op->file[1].modification = true; | |
da8d0755 DH |
1938 | op->file[0].update_ctime = true; |
1939 | op->file[1].update_ctime = true; | |
e49c7b2f DH |
1940 | |
1941 | op->dentry = old_dentry; | |
1942 | op->dentry_2 = new_dentry; | |
1943 | op->rename.new_negative = d_is_negative(new_dentry); | |
1944 | op->ops = &afs_rename_operation; | |
260a9803 | 1945 | |
79ddbfa5 DH |
1946 | /* For non-directories, check whether the target is busy and if so, |
1947 | * make a copy of the dentry and then do a silly-rename. If the | |
1948 | * silly-rename succeeds, the copied dentry is hashed and becomes the | |
1949 | * new target. | |
1950 | */ | |
1951 | if (d_is_positive(new_dentry) && !d_is_dir(new_dentry)) { | |
1952 | /* To prevent any new references to the target during the | |
1953 | * rename, we unhash the dentry in advance. | |
1954 | */ | |
1955 | if (!d_unhashed(new_dentry)) { | |
1956 | d_drop(new_dentry); | |
e49c7b2f | 1957 | op->rename.rehash = new_dentry; |
79ddbfa5 DH |
1958 | } |
1959 | ||
1960 | if (d_count(new_dentry) > 2) { | |
1961 | /* copy the target dentry's name */ | |
e49c7b2f DH |
1962 | op->rename.tmp = d_alloc(new_dentry->d_parent, |
1963 | &new_dentry->d_name); | |
b4280812 JC |
1964 | if (!op->rename.tmp) { |
1965 | op->error = -ENOMEM; | |
e49c7b2f | 1966 | goto error; |
b4280812 | 1967 | } |
79ddbfa5 DH |
1968 | |
1969 | ret = afs_sillyrename(new_dvnode, | |
1970 | AFS_FS_I(d_inode(new_dentry)), | |
e49c7b2f | 1971 | new_dentry, op->key); |
b4280812 JC |
1972 | if (ret) { |
1973 | op->error = ret; | |
e49c7b2f | 1974 | goto error; |
b4280812 | 1975 | } |
79ddbfa5 | 1976 | |
e49c7b2f DH |
1977 | op->dentry_2 = op->rename.tmp; |
1978 | op->rename.rehash = NULL; | |
1979 | op->rename.new_negative = true; | |
79ddbfa5 DH |
1980 | } |
1981 | } | |
1982 | ||
9dd0b82e DH |
1983 | /* This bit is potentially nasty as there's a potential race with |
1984 | * afs_d_revalidate{,_rcu}(). We have to change d_fsdata on the dentry | |
1985 | * to reflect it's new parent's new data_version after the op, but | |
1986 | * d_revalidate may see old_dentry between the op having taken place | |
1987 | * and the version being updated. | |
1988 | * | |
1989 | * So drop the old_dentry for now to make other threads go through | |
1990 | * lookup instead - which we hold a lock against. | |
1991 | */ | |
1992 | d_drop(old_dentry); | |
1993 | ||
e49c7b2f | 1994 | return afs_do_sync_operation(op); |
63a4681f | 1995 | |
260a9803 | 1996 | error: |
e49c7b2f | 1997 | return afs_put_operation(op); |
260a9803 | 1998 | } |
f3ddee8d DH |
1999 | |
2000 | /* | |
255ed636 DH |
2001 | * Release a directory folio and clean up its private state if it's not busy |
2002 | * - return true if the folio can now be released, false if not | |
f3ddee8d | 2003 | */ |
255ed636 | 2004 | static int afs_dir_releasepage(struct page *subpage, gfp_t gfp_flags) |
f3ddee8d | 2005 | { |
255ed636 DH |
2006 | struct folio *folio = page_folio(subpage); |
2007 | struct afs_vnode *dvnode = AFS_FS_I(folio_inode(folio)); | |
f3ddee8d | 2008 | |
255ed636 | 2009 | _enter("{{%llx:%llu}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, folio_index(folio)); |
f3ddee8d | 2010 | |
255ed636 | 2011 | folio_detach_private(folio); |
f3ddee8d DH |
2012 | |
2013 | /* The directory will need reloading. */ | |
2014 | if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
2015 | afs_stat_v(dvnode, n_relpg); | |
255ed636 | 2016 | return true; |
f3ddee8d DH |
2017 | } |
2018 | ||
2019 | /* | |
255ed636 | 2020 | * Invalidate part or all of a folio. |
f3ddee8d | 2021 | */ |
255ed636 | 2022 | static void afs_dir_invalidatepage(struct page *subpage, unsigned int offset, |
f3ddee8d DH |
2023 | unsigned int length) |
2024 | { | |
255ed636 DH |
2025 | struct folio *folio = page_folio(subpage); |
2026 | struct afs_vnode *dvnode = AFS_FS_I(folio_inode(folio)); | |
f3ddee8d | 2027 | |
255ed636 | 2028 | _enter("{%lu},%u,%u", folio_index(folio), offset, length); |
f3ddee8d | 2029 | |
255ed636 | 2030 | BUG_ON(!folio_test_locked(folio)); |
f3ddee8d DH |
2031 | |
2032 | /* The directory will need reloading. */ | |
2033 | if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
2034 | afs_stat_v(dvnode, n_inval); | |
2035 | ||
255ed636 DH |
2036 | /* we clean up only if the entire folio is being invalidated */ |
2037 | if (offset == 0 && length == folio_size(folio)) | |
2038 | folio_detach_private(folio); | |
f3ddee8d | 2039 | } |