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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); |
25885a35 | 27 | static bool afs_lookup_one_filldir(struct dir_context *ctx, const char *name, int nlen, |
afefdbb2 | 28 | loff_t fpos, u64 ino, unsigned dtype); |
25885a35 | 29 | static bool afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen, |
5cf9dd55 | 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); | |
508cae68 | 44 | static bool afs_dir_release_folio(struct folio *folio, gfp_t gfp_flags); |
f6bc6fb8 MWO |
45 | static void afs_dir_invalidate_folio(struct folio *folio, size_t offset, |
46 | size_t length); | |
f3ddee8d | 47 | |
d7c994b3 MWO |
48 | static bool afs_dir_dirty_folio(struct address_space *mapping, |
49 | struct folio *folio) | |
f3ddee8d DH |
50 | { |
51 | BUG(); /* This should never happen. */ | |
52 | } | |
1da177e4 | 53 | |
4b6f5d20 | 54 | const struct file_operations afs_dir_file_operations = { |
1da177e4 | 55 | .open = afs_dir_open, |
00d3b7a4 | 56 | .release = afs_release, |
29884eff | 57 | .iterate_shared = afs_readdir, |
e8d6c554 | 58 | .lock = afs_lock, |
3222a3e5 | 59 | .llseek = generic_file_llseek, |
1da177e4 LT |
60 | }; |
61 | ||
754661f1 | 62 | const struct inode_operations afs_dir_inode_operations = { |
260a9803 DH |
63 | .create = afs_create, |
64 | .lookup = afs_lookup, | |
65 | .link = afs_link, | |
66 | .unlink = afs_unlink, | |
67 | .symlink = afs_symlink, | |
68 | .mkdir = afs_mkdir, | |
69 | .rmdir = afs_rmdir, | |
2773bf00 | 70 | .rename = afs_rename, |
00d3b7a4 | 71 | .permission = afs_permission, |
416351f2 | 72 | .getattr = afs_getattr, |
31143d5d | 73 | .setattr = afs_setattr, |
1da177e4 LT |
74 | }; |
75 | ||
f3ddee8d | 76 | const struct address_space_operations afs_dir_aops = { |
d7c994b3 | 77 | .dirty_folio = afs_dir_dirty_folio, |
508cae68 | 78 | .release_folio = afs_dir_release_folio, |
f6bc6fb8 | 79 | .invalidate_folio = afs_dir_invalidate_folio, |
f3ddee8d DH |
80 | }; |
81 | ||
d61dcce2 | 82 | const struct dentry_operations afs_fs_dentry_operations = { |
1da177e4 LT |
83 | .d_revalidate = afs_d_revalidate, |
84 | .d_delete = afs_d_delete, | |
260a9803 | 85 | .d_release = afs_d_release, |
d18610b0 | 86 | .d_automount = afs_d_automount, |
79ddbfa5 | 87 | .d_iput = afs_d_iput, |
1da177e4 LT |
88 | }; |
89 | ||
5cf9dd55 DH |
90 | struct afs_lookup_one_cookie { |
91 | struct dir_context ctx; | |
92 | struct qstr name; | |
93 | bool found; | |
94 | struct afs_fid fid; | |
95 | }; | |
96 | ||
260a9803 | 97 | struct afs_lookup_cookie { |
5cf9dd55 DH |
98 | struct dir_context ctx; |
99 | struct qstr name; | |
100 | bool found; | |
101 | bool one_only; | |
102 | unsigned short nr_fids; | |
5cf9dd55 | 103 | struct afs_fid fids[50]; |
1da177e4 LT |
104 | }; |
105 | ||
c4508464 | 106 | /* |
255ed636 | 107 | * Drop the refs that we're holding on the folios we were reading into. We've |
c4508464 DH |
108 | * got refs on the first nr_pages pages. |
109 | */ | |
110 | static void afs_dir_read_cleanup(struct afs_read *req) | |
111 | { | |
874c8ca1 | 112 | struct address_space *mapping = req->vnode->netfs.inode.i_mapping; |
255ed636 | 113 | struct folio *folio; |
c4508464 DH |
114 | pgoff_t last = req->nr_pages - 1; |
115 | ||
116 | XA_STATE(xas, &mapping->i_pages, 0); | |
117 | ||
118 | if (unlikely(!req->nr_pages)) | |
119 | return; | |
120 | ||
121 | rcu_read_lock(); | |
255ed636 DH |
122 | xas_for_each(&xas, folio, last) { |
123 | if (xas_retry(&xas, folio)) | |
c4508464 | 124 | continue; |
255ed636 DH |
125 | BUG_ON(xa_is_value(folio)); |
126 | ASSERTCMP(folio_file_mapping(folio), ==, mapping); | |
c4508464 | 127 | |
255ed636 | 128 | folio_put(folio); |
c4508464 DH |
129 | } |
130 | ||
131 | rcu_read_unlock(); | |
132 | } | |
133 | ||
1da177e4 | 134 | /* |
255ed636 | 135 | * check that a directory folio is valid |
1da177e4 | 136 | */ |
255ed636 DH |
137 | static bool afs_dir_check_folio(struct afs_vnode *dvnode, struct folio *folio, |
138 | loff_t i_size) | |
1da177e4 | 139 | { |
255ed636 DH |
140 | union afs_xdr_dir_block *block; |
141 | size_t offset, size; | |
142 | loff_t pos; | |
1da177e4 | 143 | |
255ed636 | 144 | /* Determine how many magic numbers there should be in this folio, but |
dab17c1a DH |
145 | * we must take care because the directory may change size under us. |
146 | */ | |
255ed636 DH |
147 | pos = folio_pos(folio); |
148 | if (i_size <= pos) | |
dab17c1a DH |
149 | goto checked; |
150 | ||
255ed636 DH |
151 | size = min_t(loff_t, folio_size(folio), i_size - pos); |
152 | for (offset = 0; offset < size; offset += sizeof(*block)) { | |
153 | block = kmap_local_folio(folio, offset); | |
154 | if (block->hdr.magic != AFS_DIR_MAGIC) { | |
155 | printk("kAFS: %s(%lx): [%llx] bad magic %zx/%zx is %04hx\n", | |
874c8ca1 | 156 | __func__, dvnode->netfs.inode.i_ino, |
255ed636 DH |
157 | pos, offset, size, ntohs(block->hdr.magic)); |
158 | trace_afs_dir_check_failed(dvnode, pos + offset, i_size); | |
159 | kunmap_local(block); | |
f51375cd | 160 | trace_afs_file_error(dvnode, -EIO, afs_file_error_dir_bad_magic); |
1da177e4 LT |
161 | goto error; |
162 | } | |
63a4681f DH |
163 | |
164 | /* Make sure each block is NUL terminated so we can reasonably | |
255ed636 | 165 | * use string functions on it. The filenames in the folio |
63a4681f DH |
166 | * *should* be NUL-terminated anyway. |
167 | */ | |
255ed636 | 168 | ((u8 *)block)[AFS_DIR_BLOCK_SIZE - 1] = 0; |
63a4681f | 169 | |
255ed636 DH |
170 | kunmap_local(block); |
171 | } | |
dab17c1a | 172 | checked: |
f3ddee8d | 173 | afs_stat_v(dvnode, n_read_dir); |
be5b82db | 174 | return true; |
1da177e4 | 175 | |
ec26815a | 176 | error: |
be5b82db | 177 | return false; |
ec26815a | 178 | } |
1da177e4 | 179 | |
445b1028 | 180 | /* |
c4508464 | 181 | * Dump the contents of a directory. |
445b1028 | 182 | */ |
c4508464 | 183 | static void afs_dir_dump(struct afs_vnode *dvnode, struct afs_read *req) |
445b1028 | 184 | { |
255ed636 | 185 | union afs_xdr_dir_block *block; |
874c8ca1 | 186 | struct address_space *mapping = dvnode->netfs.inode.i_mapping; |
255ed636 | 187 | struct folio *folio; |
c4508464 | 188 | pgoff_t last = req->nr_pages - 1; |
255ed636 | 189 | size_t offset, size; |
445b1028 | 190 | |
c4508464 | 191 | XA_STATE(xas, &mapping->i_pages, 0); |
445b1028 | 192 | |
c4508464 | 193 | pr_warn("DIR %llx:%llx f=%llx l=%llx al=%llx\n", |
445b1028 | 194 | dvnode->fid.vid, dvnode->fid.vnode, |
c4508464 DH |
195 | req->file_size, req->len, req->actual_len); |
196 | pr_warn("DIR %llx %x %zx %zx\n", | |
197 | req->pos, req->nr_pages, | |
198 | req->iter->iov_offset, iov_iter_count(req->iter)); | |
445b1028 | 199 | |
255ed636 DH |
200 | xas_for_each(&xas, folio, last) { |
201 | if (xas_retry(&xas, folio)) | |
c4508464 | 202 | continue; |
445b1028 | 203 | |
255ed636 | 204 | BUG_ON(folio_file_mapping(folio) != mapping); |
c4508464 | 205 | |
255ed636 DH |
206 | size = min_t(loff_t, folio_size(folio), req->actual_len - folio_pos(folio)); |
207 | for (offset = 0; offset < size; offset += sizeof(*block)) { | |
208 | block = kmap_local_folio(folio, offset); | |
209 | pr_warn("[%02lx] %32phN\n", folio_index(folio) + offset, block); | |
210 | kunmap_local(block); | |
445b1028 | 211 | } |
445b1028 | 212 | } |
c4508464 DH |
213 | } |
214 | ||
215 | /* | |
255ed636 | 216 | * Check all the blocks in a directory. All the folios are held pinned. |
c4508464 DH |
217 | */ |
218 | static int afs_dir_check(struct afs_vnode *dvnode, struct afs_read *req) | |
219 | { | |
874c8ca1 | 220 | struct address_space *mapping = dvnode->netfs.inode.i_mapping; |
255ed636 | 221 | struct folio *folio; |
c4508464 DH |
222 | pgoff_t last = req->nr_pages - 1; |
223 | int ret = 0; | |
224 | ||
225 | XA_STATE(xas, &mapping->i_pages, 0); | |
226 | ||
227 | if (unlikely(!req->nr_pages)) | |
228 | return 0; | |
229 | ||
230 | rcu_read_lock(); | |
255ed636 DH |
231 | xas_for_each(&xas, folio, last) { |
232 | if (xas_retry(&xas, folio)) | |
c4508464 DH |
233 | continue; |
234 | ||
255ed636 | 235 | BUG_ON(folio_file_mapping(folio) != mapping); |
c4508464 | 236 | |
255ed636 | 237 | if (!afs_dir_check_folio(dvnode, folio, req->actual_len)) { |
c4508464 DH |
238 | afs_dir_dump(dvnode, req); |
239 | ret = -EIO; | |
240 | break; | |
241 | } | |
242 | } | |
243 | ||
244 | rcu_read_unlock(); | |
245 | return ret; | |
445b1028 DH |
246 | } |
247 | ||
1da177e4 LT |
248 | /* |
249 | * open an AFS directory file | |
250 | */ | |
251 | static int afs_dir_open(struct inode *inode, struct file *file) | |
252 | { | |
253 | _enter("{%lu}", inode->i_ino); | |
254 | ||
00317636 DH |
255 | BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); |
256 | BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); | |
1da177e4 | 257 | |
08e0e7c8 | 258 | if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) |
1da177e4 LT |
259 | return -ENOENT; |
260 | ||
00d3b7a4 | 261 | return afs_open(inode, file); |
ec26815a | 262 | } |
1da177e4 | 263 | |
f3ddee8d DH |
264 | /* |
265 | * Read the directory into the pagecache in one go, scrubbing the previous | |
255ed636 | 266 | * contents. The list of folios is returned, pinning them so that they don't |
f3ddee8d DH |
267 | * get reclaimed during the iteration. |
268 | */ | |
269 | static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key) | |
b61f7dcf | 270 | __acquires(&dvnode->validate_lock) |
f3ddee8d | 271 | { |
874c8ca1 | 272 | struct address_space *mapping = dvnode->netfs.inode.i_mapping; |
f3ddee8d DH |
273 | struct afs_read *req; |
274 | loff_t i_size; | |
255ed636 | 275 | int nr_pages, i; |
c4508464 DH |
276 | int ret; |
277 | ||
278 | _enter(""); | |
279 | ||
280 | req = kzalloc(sizeof(*req), GFP_KERNEL); | |
281 | if (!req) | |
282 | return ERR_PTR(-ENOMEM); | |
f3ddee8d | 283 | |
c4508464 DH |
284 | refcount_set(&req->usage, 1); |
285 | req->vnode = dvnode; | |
286 | req->key = key_get(key); | |
287 | req->cleanup = afs_dir_read_cleanup; | |
288 | ||
289 | expand: | |
874c8ca1 | 290 | i_size = i_size_read(&dvnode->netfs.inode); |
c4508464 DH |
291 | if (i_size < 2048) { |
292 | ret = afs_bad(dvnode, afs_file_error_dir_small); | |
293 | goto error; | |
294 | } | |
f51375cd DH |
295 | if (i_size > 2048 * 1024) { |
296 | trace_afs_file_error(dvnode, -EFBIG, afs_file_error_dir_big); | |
c4508464 DH |
297 | ret = -EFBIG; |
298 | goto error; | |
f51375cd | 299 | } |
f3ddee8d DH |
300 | |
301 | _enter("%llu", i_size); | |
302 | ||
f3ddee8d | 303 | nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE; |
f3ddee8d | 304 | |
f3ddee8d DH |
305 | req->actual_len = i_size; /* May change */ |
306 | req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */ | |
307 | req->data_version = dvnode->status.data_version; /* May change */ | |
de4eda9d | 308 | iov_iter_xarray(&req->def_iter, ITER_DEST, &dvnode->netfs.inode.i_mapping->i_pages, |
c4508464 DH |
309 | 0, i_size); |
310 | req->iter = &req->def_iter; | |
f3ddee8d | 311 | |
c4508464 | 312 | /* Fill in any gaps that we might find where the memory reclaimer has |
255ed636 | 313 | * been at work and pin all the folios. If there are any gaps, we will |
f3ddee8d DH |
314 | * need to reread the entire directory contents. |
315 | */ | |
c4508464 DH |
316 | i = req->nr_pages; |
317 | while (i < nr_pages) { | |
255ed636 | 318 | struct folio *folio; |
f3ddee8d | 319 | |
255ed636 DH |
320 | folio = filemap_get_folio(mapping, i); |
321 | if (!folio) { | |
f3ddee8d DH |
322 | if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
323 | afs_stat_v(dvnode, n_inval); | |
324 | ||
325 | ret = -ENOMEM; | |
255ed636 DH |
326 | folio = __filemap_get_folio(mapping, |
327 | i, FGP_LOCK | FGP_CREAT, | |
328 | mapping->gfp_mask); | |
329 | if (!folio) | |
f3ddee8d | 330 | goto error; |
255ed636 DH |
331 | folio_attach_private(folio, (void *)1); |
332 | folio_unlock(folio); | |
f3ddee8d | 333 | } |
255ed636 DH |
334 | |
335 | req->nr_pages += folio_nr_pages(folio); | |
336 | i += folio_nr_pages(folio); | |
c4508464 | 337 | } |
f3ddee8d DH |
338 | |
339 | /* If we're going to reload, we need to lock all the pages to prevent | |
340 | * races. | |
341 | */ | |
b61f7dcf DH |
342 | ret = -ERESTARTSYS; |
343 | if (down_read_killable(&dvnode->validate_lock) < 0) | |
344 | goto error; | |
f3ddee8d | 345 | |
b61f7dcf DH |
346 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
347 | goto success; | |
f3ddee8d | 348 | |
b61f7dcf DH |
349 | up_read(&dvnode->validate_lock); |
350 | if (down_write_killable(&dvnode->validate_lock) < 0) | |
351 | goto error; | |
352 | ||
353 | if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { | |
99987c56 | 354 | trace_afs_reload_dir(dvnode); |
c69bf479 | 355 | ret = afs_fetch_data(dvnode, req); |
f3ddee8d | 356 | if (ret < 0) |
b61f7dcf | 357 | goto error_unlock; |
f3ddee8d DH |
358 | |
359 | task_io_account_read(PAGE_SIZE * req->nr_pages); | |
360 | ||
c4508464 DH |
361 | if (req->len < req->file_size) { |
362 | /* The content has grown, so we need to expand the | |
363 | * buffer. | |
364 | */ | |
365 | up_write(&dvnode->validate_lock); | |
366 | goto expand; | |
367 | } | |
f3ddee8d DH |
368 | |
369 | /* Validate the data we just read. */ | |
c4508464 DH |
370 | ret = afs_dir_check(dvnode, req); |
371 | if (ret < 0) | |
445b1028 | 372 | goto error_unlock; |
f3ddee8d DH |
373 | |
374 | // TODO: Trim excess pages | |
375 | ||
376 | set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags); | |
377 | } | |
378 | ||
b61f7dcf | 379 | downgrade_write(&dvnode->validate_lock); |
f3ddee8d | 380 | success: |
f3ddee8d DH |
381 | return req; |
382 | ||
f3ddee8d | 383 | error_unlock: |
b61f7dcf | 384 | up_write(&dvnode->validate_lock); |
f3ddee8d DH |
385 | error: |
386 | afs_put_read(req); | |
387 | _leave(" = %d", ret); | |
388 | return ERR_PTR(ret); | |
f3ddee8d DH |
389 | } |
390 | ||
1da177e4 LT |
391 | /* |
392 | * deal with one block in an AFS directory | |
393 | */ | |
f51375cd DH |
394 | static int afs_dir_iterate_block(struct afs_vnode *dvnode, |
395 | struct dir_context *ctx, | |
00317636 | 396 | union afs_xdr_dir_block *block, |
1bbae9f8 | 397 | unsigned blkoff) |
1da177e4 | 398 | { |
00317636 | 399 | union afs_xdr_dirent *dire; |
366911cd | 400 | unsigned offset, next, curr, nr_slots; |
1da177e4 | 401 | size_t nlen; |
1bbae9f8 | 402 | int tmp; |
1da177e4 | 403 | |
255ed636 | 404 | _enter("%llx,%x", ctx->pos, blkoff); |
1da177e4 | 405 | |
00317636 | 406 | curr = (ctx->pos - blkoff) / sizeof(union afs_xdr_dirent); |
1da177e4 LT |
407 | |
408 | /* walk through the block, an entry at a time */ | |
4ea219a8 DH |
409 | for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS); |
410 | offset < AFS_DIR_SLOTS_PER_BLOCK; | |
1da177e4 LT |
411 | offset = next |
412 | ) { | |
1da177e4 | 413 | /* skip entries marked unused in the bitmap */ |
00317636 | 414 | if (!(block->hdr.bitmap[offset / 8] & |
1da177e4 | 415 | (1 << (offset % 8)))) { |
5b5e0928 | 416 | _debug("ENT[%zu.%u]: unused", |
00317636 | 417 | blkoff / sizeof(union afs_xdr_dir_block), offset); |
366911cd | 418 | next = offset + 1; |
1da177e4 | 419 | if (offset >= curr) |
1bbae9f8 | 420 | ctx->pos = blkoff + |
00317636 | 421 | next * sizeof(union afs_xdr_dirent); |
1da177e4 LT |
422 | continue; |
423 | } | |
424 | ||
425 | /* got a valid entry */ | |
426 | dire = &block->dirents[offset]; | |
427 | nlen = strnlen(dire->u.name, | |
428 | sizeof(*block) - | |
00317636 | 429 | offset * sizeof(union afs_xdr_dirent)); |
366911cd DH |
430 | if (nlen > AFSNAMEMAX - 1) { |
431 | _debug("ENT[%zu]: name too long (len %u/%zu)", | |
432 | blkoff / sizeof(union afs_xdr_dir_block), | |
433 | offset, nlen); | |
434 | return afs_bad(dvnode, afs_file_error_dir_name_too_long); | |
435 | } | |
1da177e4 | 436 | |
5b5e0928 | 437 | _debug("ENT[%zu.%u]: %s %zu \"%s\"", |
00317636 | 438 | blkoff / sizeof(union afs_xdr_dir_block), offset, |
1da177e4 LT |
439 | (offset < curr ? "skip" : "fill"), |
440 | nlen, dire->u.name); | |
441 | ||
366911cd DH |
442 | nr_slots = afs_dir_calc_slots(nlen); |
443 | next = offset + nr_slots; | |
444 | if (next > AFS_DIR_SLOTS_PER_BLOCK) { | |
445 | _debug("ENT[%zu.%u]:" | |
446 | " %u extends beyond end dir block" | |
447 | " (len %zu)", | |
448 | blkoff / sizeof(union afs_xdr_dir_block), | |
449 | offset, next, nlen); | |
450 | return afs_bad(dvnode, afs_file_error_dir_over_end); | |
451 | } | |
452 | ||
453 | /* Check that the name-extension dirents are all allocated */ | |
454 | for (tmp = 1; tmp < nr_slots; tmp++) { | |
455 | unsigned int ix = offset + tmp; | |
456 | if (!(block->hdr.bitmap[ix / 8] & (1 << (ix % 8)))) { | |
457 | _debug("ENT[%zu.u]:" | |
458 | " %u unmarked extension (%u/%u)", | |
00317636 | 459 | blkoff / sizeof(union afs_xdr_dir_block), |
366911cd | 460 | offset, tmp, nr_slots); |
f51375cd | 461 | return afs_bad(dvnode, afs_file_error_dir_unmarked_ext); |
1da177e4 | 462 | } |
1da177e4 LT |
463 | } |
464 | ||
465 | /* skip if starts before the current position */ | |
17eabd42 DH |
466 | if (offset < curr) { |
467 | if (next > curr) | |
468 | ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent); | |
1da177e4 | 469 | continue; |
17eabd42 | 470 | } |
1da177e4 LT |
471 | |
472 | /* found the next entry */ | |
1bbae9f8 | 473 | if (!dir_emit(ctx, dire->u.name, nlen, |
1da177e4 | 474 | ntohl(dire->u.vnode), |
5cf9dd55 DH |
475 | (ctx->actor == afs_lookup_filldir || |
476 | ctx->actor == afs_lookup_one_filldir)? | |
1bbae9f8 | 477 | ntohl(dire->u.unique) : DT_UNKNOWN)) { |
1da177e4 LT |
478 | _leave(" = 0 [full]"); |
479 | return 0; | |
480 | } | |
481 | ||
00317636 | 482 | ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent); |
1da177e4 LT |
483 | } |
484 | ||
485 | _leave(" = 1 [more]"); | |
486 | return 1; | |
ec26815a | 487 | } |
1da177e4 | 488 | |
1da177e4 | 489 | /* |
08e0e7c8 | 490 | * iterate through the data blob that lists the contents of an AFS directory |
1da177e4 | 491 | */ |
1bbae9f8 | 492 | static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx, |
9dd0b82e | 493 | struct key *key, afs_dataversion_t *_dir_version) |
1da177e4 | 494 | { |
f3ddee8d | 495 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
00317636 | 496 | union afs_xdr_dir_block *dblock; |
f3ddee8d | 497 | struct afs_read *req; |
255ed636 DH |
498 | struct folio *folio; |
499 | unsigned offset, size; | |
1da177e4 LT |
500 | int ret; |
501 | ||
1bbae9f8 | 502 | _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos); |
1da177e4 | 503 | |
08e0e7c8 | 504 | if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { |
1da177e4 LT |
505 | _leave(" = -ESTALE"); |
506 | return -ESTALE; | |
507 | } | |
508 | ||
f3ddee8d DH |
509 | req = afs_read_dir(dvnode, key); |
510 | if (IS_ERR(req)) | |
511 | return PTR_ERR(req); | |
9dd0b82e | 512 | *_dir_version = req->data_version; |
f3ddee8d | 513 | |
1da177e4 | 514 | /* round the file position up to the next entry boundary */ |
00317636 DH |
515 | ctx->pos += sizeof(union afs_xdr_dirent) - 1; |
516 | ctx->pos &= ~(sizeof(union afs_xdr_dirent) - 1); | |
1da177e4 LT |
517 | |
518 | /* walk through the blocks in sequence */ | |
519 | ret = 0; | |
f3ddee8d | 520 | while (ctx->pos < req->actual_len) { |
255ed636 | 521 | /* Fetch the appropriate folio from the directory and re-add it |
c4508464 | 522 | * to the LRU. We have all the pages pinned with an extra ref. |
f3ddee8d | 523 | */ |
255ed636 DH |
524 | folio = __filemap_get_folio(dir->i_mapping, ctx->pos / PAGE_SIZE, |
525 | FGP_ACCESSED, 0); | |
526 | if (!folio) { | |
f51375cd | 527 | ret = afs_bad(dvnode, afs_file_error_dir_missing_page); |
1da177e4 LT |
528 | break; |
529 | } | |
530 | ||
255ed636 DH |
531 | offset = round_down(ctx->pos, sizeof(*dblock)) - folio_file_pos(folio); |
532 | size = min_t(loff_t, folio_size(folio), | |
533 | req->actual_len - folio_file_pos(folio)); | |
1da177e4 | 534 | |
1da177e4 | 535 | do { |
255ed636 DH |
536 | dblock = kmap_local_folio(folio, offset); |
537 | ret = afs_dir_iterate_block(dvnode, ctx, dblock, | |
538 | folio_file_pos(folio) + offset); | |
539 | kunmap_local(dblock); | |
540 | if (ret != 1) | |
1da177e4 | 541 | goto out; |
1da177e4 | 542 | |
255ed636 | 543 | } while (offset += sizeof(*dblock), offset < size); |
1da177e4 | 544 | |
1da177e4 LT |
545 | ret = 0; |
546 | } | |
547 | ||
ec26815a | 548 | out: |
b61f7dcf | 549 | up_read(&dvnode->validate_lock); |
f3ddee8d | 550 | afs_put_read(req); |
1da177e4 LT |
551 | _leave(" = %d", ret); |
552 | return ret; | |
ec26815a | 553 | } |
1da177e4 | 554 | |
1da177e4 LT |
555 | /* |
556 | * read an AFS directory | |
557 | */ | |
1bbae9f8 | 558 | static int afs_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 559 | { |
9dd0b82e DH |
560 | afs_dataversion_t dir_version; |
561 | ||
562 | return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file), | |
563 | &dir_version); | |
ec26815a | 564 | } |
1da177e4 | 565 | |
1da177e4 | 566 | /* |
5cf9dd55 | 567 | * Search the directory for a single name |
1da177e4 LT |
568 | * - if afs_dir_iterate_block() spots this function, it'll pass the FID |
569 | * uniquifier through dtype | |
570 | */ | |
25885a35 | 571 | static bool afs_lookup_one_filldir(struct dir_context *ctx, const char *name, |
5cf9dd55 | 572 | int nlen, loff_t fpos, u64 ino, unsigned dtype) |
1da177e4 | 573 | { |
5cf9dd55 DH |
574 | struct afs_lookup_one_cookie *cookie = |
575 | container_of(ctx, struct afs_lookup_one_cookie, ctx); | |
1da177e4 | 576 | |
1bbae9f8 AV |
577 | _enter("{%s,%u},%s,%u,,%llu,%u", |
578 | cookie->name.name, cookie->name.len, name, nlen, | |
ba3e0e1a | 579 | (unsigned long long) ino, dtype); |
1da177e4 | 580 | |
08e0e7c8 | 581 | /* insanity checks first */ |
00317636 DH |
582 | BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); |
583 | BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); | |
08e0e7c8 | 584 | |
1bbae9f8 AV |
585 | if (cookie->name.len != nlen || |
586 | memcmp(cookie->name.name, name, nlen) != 0) { | |
25885a35 AV |
587 | _leave(" = true [keep looking]"); |
588 | return true; | |
1da177e4 LT |
589 | } |
590 | ||
591 | cookie->fid.vnode = ino; | |
592 | cookie->fid.unique = dtype; | |
593 | cookie->found = 1; | |
594 | ||
25885a35 AV |
595 | _leave(" = false [found]"); |
596 | return false; | |
ec26815a | 597 | } |
1da177e4 | 598 | |
1da177e4 | 599 | /* |
5cf9dd55 | 600 | * Do a lookup of a single name in a directory |
260a9803 | 601 | * - just returns the FID the dentry name maps to if found |
1da177e4 | 602 | */ |
5cf9dd55 | 603 | static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry, |
9dd0b82e DH |
604 | struct afs_fid *fid, struct key *key, |
605 | afs_dataversion_t *_dir_version) | |
1da177e4 | 606 | { |
1bbae9f8 | 607 | struct afs_super_info *as = dir->i_sb->s_fs_info; |
5cf9dd55 DH |
608 | struct afs_lookup_one_cookie cookie = { |
609 | .ctx.actor = afs_lookup_one_filldir, | |
1bbae9f8 AV |
610 | .name = dentry->d_name, |
611 | .fid.vid = as->volume->vid | |
612 | }; | |
1da177e4 LT |
613 | int ret; |
614 | ||
a455589f | 615 | _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); |
1da177e4 | 616 | |
1da177e4 | 617 | /* search the directory */ |
9dd0b82e | 618 | ret = afs_dir_iterate(dir, &cookie.ctx, key, _dir_version); |
1da177e4 | 619 | if (ret < 0) { |
08e0e7c8 DH |
620 | _leave(" = %d [iter]", ret); |
621 | return ret; | |
1da177e4 LT |
622 | } |
623 | ||
1da177e4 | 624 | if (!cookie.found) { |
08e0e7c8 DH |
625 | _leave(" = -ENOENT [not found]"); |
626 | return -ENOENT; | |
1da177e4 LT |
627 | } |
628 | ||
08e0e7c8 | 629 | *fid = cookie.fid; |
3b6492df | 630 | _leave(" = 0 { vn=%llu u=%u }", fid->vnode, fid->unique); |
08e0e7c8 DH |
631 | return 0; |
632 | } | |
633 | ||
5cf9dd55 DH |
634 | /* |
635 | * search the directory for a name | |
636 | * - if afs_dir_iterate_block() spots this function, it'll pass the FID | |
637 | * uniquifier through dtype | |
638 | */ | |
25885a35 | 639 | static bool afs_lookup_filldir(struct dir_context *ctx, const char *name, |
5cf9dd55 DH |
640 | int nlen, loff_t fpos, u64 ino, unsigned dtype) |
641 | { | |
642 | struct afs_lookup_cookie *cookie = | |
643 | container_of(ctx, struct afs_lookup_cookie, ctx); | |
5cf9dd55 DH |
644 | |
645 | _enter("{%s,%u},%s,%u,,%llu,%u", | |
646 | cookie->name.name, cookie->name.len, name, nlen, | |
647 | (unsigned long long) ino, dtype); | |
648 | ||
649 | /* insanity checks first */ | |
00317636 DH |
650 | BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); |
651 | BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); | |
5cf9dd55 DH |
652 | |
653 | if (cookie->found) { | |
654 | if (cookie->nr_fids < 50) { | |
655 | cookie->fids[cookie->nr_fids].vnode = ino; | |
656 | cookie->fids[cookie->nr_fids].unique = dtype; | |
657 | cookie->nr_fids++; | |
658 | } | |
659 | } else if (cookie->name.len == nlen && | |
660 | memcmp(cookie->name.name, name, nlen) == 0) { | |
e49c7b2f DH |
661 | cookie->fids[1].vnode = ino; |
662 | cookie->fids[1].unique = dtype; | |
5cf9dd55 DH |
663 | cookie->found = 1; |
664 | if (cookie->one_only) | |
25885a35 | 665 | return false; |
5cf9dd55 DH |
666 | } |
667 | ||
25885a35 | 668 | return cookie->nr_fids < 50; |
5cf9dd55 DH |
669 | } |
670 | ||
e49c7b2f DH |
671 | /* |
672 | * Deal with the result of a successful lookup operation. Turn all the files | |
673 | * into inodes and save the first one - which is the one we actually want. | |
674 | */ | |
675 | static void afs_do_lookup_success(struct afs_operation *op) | |
676 | { | |
677 | struct afs_vnode_param *vp; | |
678 | struct afs_vnode *vnode; | |
679 | struct inode *inode; | |
680 | u32 abort_code; | |
681 | int i; | |
682 | ||
683 | _enter(""); | |
684 | ||
685 | for (i = 0; i < op->nr_files; i++) { | |
686 | switch (i) { | |
687 | case 0: | |
688 | vp = &op->file[0]; | |
689 | abort_code = vp->scb.status.abort_code; | |
690 | if (abort_code != 0) { | |
44767c35 | 691 | op->ac.abort_code = abort_code; |
e49c7b2f DH |
692 | op->error = afs_abort_to_error(abort_code); |
693 | } | |
694 | break; | |
695 | ||
696 | case 1: | |
697 | vp = &op->file[1]; | |
698 | break; | |
699 | ||
700 | default: | |
701 | vp = &op->more_files[i - 2]; | |
702 | break; | |
703 | } | |
704 | ||
705 | if (!vp->scb.have_status && !vp->scb.have_error) | |
706 | continue; | |
707 | ||
708 | _debug("do [%u]", i); | |
709 | if (vp->vnode) { | |
710 | if (!test_bit(AFS_VNODE_UNSET, &vp->vnode->flags)) | |
711 | afs_vnode_commit_status(op, vp); | |
712 | } else if (vp->scb.status.abort_code == 0) { | |
713 | inode = afs_iget(op, vp); | |
714 | if (!IS_ERR(inode)) { | |
715 | vnode = AFS_FS_I(inode); | |
716 | afs_cache_permit(vnode, op->key, | |
717 | 0 /* Assume vnode->cb_break is 0 */ + | |
718 | op->cb_v_break, | |
719 | &vp->scb); | |
720 | vp->vnode = vnode; | |
721 | vp->put_vnode = true; | |
722 | } | |
723 | } else { | |
724 | _debug("- abort %d %llx:%llx.%x", | |
725 | vp->scb.status.abort_code, | |
726 | vp->fid.vid, vp->fid.vnode, vp->fid.unique); | |
727 | } | |
728 | } | |
729 | ||
730 | _leave(""); | |
731 | } | |
732 | ||
733 | static const struct afs_operation_ops afs_inline_bulk_status_operation = { | |
734 | .issue_afs_rpc = afs_fs_inline_bulk_status, | |
735 | .issue_yfs_rpc = yfs_fs_inline_bulk_status, | |
736 | .success = afs_do_lookup_success, | |
737 | }; | |
738 | ||
b6489a49 | 739 | static const struct afs_operation_ops afs_lookup_fetch_status_operation = { |
e49c7b2f DH |
740 | .issue_afs_rpc = afs_fs_fetch_status, |
741 | .issue_yfs_rpc = yfs_fs_fetch_status, | |
742 | .success = afs_do_lookup_success, | |
728279a5 | 743 | .aborted = afs_check_for_remote_deletion, |
e49c7b2f DH |
744 | }; |
745 | ||
20325960 DH |
746 | /* |
747 | * See if we know that the server we expect to use doesn't support | |
748 | * FS.InlineBulkStatus. | |
749 | */ | |
750 | static bool afs_server_supports_ibulk(struct afs_vnode *dvnode) | |
751 | { | |
752 | struct afs_server_list *slist; | |
753 | struct afs_volume *volume = dvnode->volume; | |
754 | struct afs_server *server; | |
755 | bool ret = true; | |
756 | int i; | |
757 | ||
758 | if (!test_bit(AFS_VOLUME_MAYBE_NO_IBULK, &volume->flags)) | |
759 | return true; | |
760 | ||
761 | rcu_read_lock(); | |
762 | slist = rcu_dereference(volume->servers); | |
763 | ||
764 | for (i = 0; i < slist->nr_servers; i++) { | |
765 | server = slist->servers[i].server; | |
766 | if (server == dvnode->cb_server) { | |
767 | if (test_bit(AFS_SERVER_FL_NO_IBULK, &server->flags)) | |
768 | ret = false; | |
769 | break; | |
770 | } | |
771 | } | |
772 | ||
773 | rcu_read_unlock(); | |
774 | return ret; | |
775 | } | |
776 | ||
5cf9dd55 DH |
777 | /* |
778 | * Do a lookup in a directory. We make use of bulk lookup to query a slew of | |
779 | * files in one go and create inodes for them. The inode of the file we were | |
780 | * asked for is returned. | |
781 | */ | |
782 | static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry, | |
783 | struct key *key) | |
784 | { | |
785 | struct afs_lookup_cookie *cookie; | |
e49c7b2f DH |
786 | struct afs_vnode_param *vp; |
787 | struct afs_operation *op; | |
39db9815 DH |
788 | struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode; |
789 | struct inode *inode = NULL, *ti; | |
9dd0b82e | 790 | afs_dataversion_t data_version = READ_ONCE(dvnode->status.data_version); |
e49c7b2f DH |
791 | long ret; |
792 | int i; | |
5cf9dd55 DH |
793 | |
794 | _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); | |
795 | ||
796 | cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL); | |
797 | if (!cookie) | |
798 | return ERR_PTR(-ENOMEM); | |
799 | ||
e49c7b2f DH |
800 | for (i = 0; i < ARRAY_SIZE(cookie->fids); i++) |
801 | cookie->fids[i].vid = dvnode->fid.vid; | |
5cf9dd55 DH |
802 | cookie->ctx.actor = afs_lookup_filldir; |
803 | cookie->name = dentry->d_name; | |
13fcc635 DH |
804 | cookie->nr_fids = 2; /* slot 0 is saved for the fid we actually want |
805 | * and slot 1 for the directory */ | |
5cf9dd55 | 806 | |
20325960 DH |
807 | if (!afs_server_supports_ibulk(dvnode)) |
808 | cookie->one_only = true; | |
5cf9dd55 | 809 | |
5cf9dd55 | 810 | /* search the directory */ |
9dd0b82e | 811 | ret = afs_dir_iterate(dir, &cookie->ctx, key, &data_version); |
e49c7b2f | 812 | if (ret < 0) |
5cf9dd55 | 813 | goto out; |
5cf9dd55 | 814 | |
9dd0b82e DH |
815 | dentry->d_fsdata = (void *)(unsigned long)data_version; |
816 | ||
e49c7b2f | 817 | ret = -ENOENT; |
5cf9dd55 DH |
818 | if (!cookie->found) |
819 | goto out; | |
820 | ||
821 | /* Check to see if we already have an inode for the primary fid. */ | |
e49c7b2f DH |
822 | inode = ilookup5(dir->i_sb, cookie->fids[1].vnode, |
823 | afs_ilookup5_test_by_fid, &cookie->fids[1]); | |
5cf9dd55 | 824 | if (inode) |
e49c7b2f | 825 | goto out; /* We do */ |
5cf9dd55 | 826 | |
e49c7b2f DH |
827 | /* Okay, we didn't find it. We need to query the server - and whilst |
828 | * we're doing that, we're going to attempt to look up a bunch of other | |
829 | * vnodes also. | |
830 | */ | |
831 | op = afs_alloc_operation(NULL, dvnode->volume); | |
832 | if (IS_ERR(op)) { | |
833 | ret = PTR_ERR(op); | |
5cf9dd55 | 834 | goto out; |
e49c7b2f | 835 | } |
5cf9dd55 | 836 | |
e49c7b2f DH |
837 | afs_op_set_vnode(op, 0, dvnode); |
838 | afs_op_set_fid(op, 1, &cookie->fids[1]); | |
13fcc635 | 839 | |
e49c7b2f DH |
840 | op->nr_files = cookie->nr_fids; |
841 | _debug("nr_files %u", op->nr_files); | |
39db9815 | 842 | |
e49c7b2f DH |
843 | /* Need space for examining all the selected files */ |
844 | op->error = -ENOMEM; | |
845 | if (op->nr_files > 2) { | |
846 | op->more_files = kvcalloc(op->nr_files - 2, | |
847 | sizeof(struct afs_vnode_param), | |
848 | GFP_KERNEL); | |
849 | if (!op->more_files) | |
850 | goto out_op; | |
851 | ||
852 | for (i = 2; i < op->nr_files; i++) { | |
853 | vp = &op->more_files[i - 2]; | |
854 | vp->fid = cookie->fids[i]; | |
855 | ||
856 | /* Find any inodes that already exist and get their | |
857 | * callback counters. | |
858 | */ | |
859 | ti = ilookup5_nowait(dir->i_sb, vp->fid.vnode, | |
860 | afs_ilookup5_test_by_fid, &vp->fid); | |
861 | if (!IS_ERR_OR_NULL(ti)) { | |
862 | vnode = AFS_FS_I(ti); | |
863 | vp->dv_before = vnode->status.data_version; | |
864 | vp->cb_break_before = afs_calc_vnode_cb_break(vnode); | |
865 | vp->vnode = vnode; | |
866 | vp->put_vnode = true; | |
a9e5c87c | 867 | vp->speculative = true; /* vnode not locked */ |
e49c7b2f | 868 | } |
39db9815 DH |
869 | } |
870 | } | |
871 | ||
5cf9dd55 DH |
872 | /* Try FS.InlineBulkStatus first. Abort codes for the individual |
873 | * lookups contained therein are stored in the reply without aborting | |
874 | * the whole operation. | |
875 | */ | |
e49c7b2f DH |
876 | op->error = -ENOTSUPP; |
877 | if (!cookie->one_only) { | |
878 | op->ops = &afs_inline_bulk_status_operation; | |
879 | afs_begin_vnode_operation(op); | |
880 | afs_wait_for_operation(op); | |
5cf9dd55 DH |
881 | } |
882 | ||
e49c7b2f DH |
883 | if (op->error == -ENOTSUPP) { |
884 | /* We could try FS.BulkStatus next, but this aborts the entire | |
885 | * op if any of the lookups fails - so, for the moment, revert | |
886 | * to FS.FetchStatus for op->file[1]. | |
887 | */ | |
888 | op->fetch_status.which = 1; | |
f8ea5c7b | 889 | op->ops = &afs_lookup_fetch_status_operation; |
e49c7b2f DH |
890 | afs_begin_vnode_operation(op); |
891 | afs_wait_for_operation(op); | |
5cf9dd55 | 892 | } |
e49c7b2f | 893 | inode = ERR_PTR(op->error); |
5cf9dd55 | 894 | |
e49c7b2f DH |
895 | out_op: |
896 | if (op->error == 0) { | |
874c8ca1 | 897 | inode = &op->file[1].vnode->netfs.inode; |
e49c7b2f | 898 | op->file[1].vnode = NULL; |
5cf9dd55 DH |
899 | } |
900 | ||
e49c7b2f DH |
901 | if (op->file[0].scb.have_status) |
902 | dentry->d_fsdata = (void *)(unsigned long)op->file[0].scb.status.data_version; | |
903 | else | |
904 | dentry->d_fsdata = (void *)(unsigned long)op->file[0].dv_before; | |
905 | ret = afs_put_operation(op); | |
5cf9dd55 DH |
906 | out: |
907 | kfree(cookie); | |
e49c7b2f DH |
908 | _leave(""); |
909 | return inode ?: ERR_PTR(ret); | |
5cf9dd55 DH |
910 | } |
911 | ||
6f8880d8 DH |
912 | /* |
913 | * Look up an entry in a directory with @sys substitution. | |
914 | */ | |
915 | static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry, | |
916 | struct key *key) | |
917 | { | |
918 | struct afs_sysnames *subs; | |
919 | struct afs_net *net = afs_i2net(dir); | |
920 | struct dentry *ret; | |
921 | char *buf, *p, *name; | |
922 | int len, i; | |
923 | ||
924 | _enter(""); | |
925 | ||
926 | ret = ERR_PTR(-ENOMEM); | |
927 | p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL); | |
928 | if (!buf) | |
929 | goto out_p; | |
930 | if (dentry->d_name.len > 4) { | |
931 | memcpy(p, dentry->d_name.name, dentry->d_name.len - 4); | |
932 | p += dentry->d_name.len - 4; | |
933 | } | |
934 | ||
935 | /* There is an ordered list of substitutes that we have to try. */ | |
936 | read_lock(&net->sysnames_lock); | |
937 | subs = net->sysnames; | |
938 | refcount_inc(&subs->usage); | |
939 | read_unlock(&net->sysnames_lock); | |
940 | ||
941 | for (i = 0; i < subs->nr; i++) { | |
942 | name = subs->subs[i]; | |
943 | len = dentry->d_name.len - 4 + strlen(name); | |
944 | if (len >= AFSNAMEMAX) { | |
945 | ret = ERR_PTR(-ENAMETOOLONG); | |
946 | goto out_s; | |
947 | } | |
948 | ||
949 | strcpy(p, name); | |
950 | ret = lookup_one_len(buf, dentry->d_parent, len); | |
951 | if (IS_ERR(ret) || d_is_positive(ret)) | |
952 | goto out_s; | |
953 | dput(ret); | |
954 | } | |
955 | ||
956 | /* We don't want to d_add() the @sys dentry here as we don't want to | |
957 | * the cached dentry to hide changes to the sysnames list. | |
958 | */ | |
959 | ret = NULL; | |
960 | out_s: | |
961 | afs_put_sysnames(subs); | |
962 | kfree(buf); | |
963 | out_p: | |
964 | key_put(key); | |
965 | return ret; | |
966 | } | |
967 | ||
08e0e7c8 DH |
968 | /* |
969 | * look up an entry in a directory | |
970 | */ | |
260a9803 | 971 | static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 972 | unsigned int flags) |
08e0e7c8 | 973 | { |
5cf9dd55 | 974 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
40a708bd | 975 | struct afs_fid fid = {}; |
08e0e7c8 | 976 | struct inode *inode; |
34b2a88f | 977 | struct dentry *d; |
00d3b7a4 | 978 | struct key *key; |
08e0e7c8 DH |
979 | int ret; |
980 | ||
3b6492df | 981 | _enter("{%llx:%llu},%p{%pd},", |
5cf9dd55 | 982 | dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry); |
260a9803 | 983 | |
2b0143b5 | 984 | ASSERTCMP(d_inode(dentry), ==, NULL); |
08e0e7c8 | 985 | |
45222b9e | 986 | if (dentry->d_name.len >= AFSNAMEMAX) { |
08e0e7c8 DH |
987 | _leave(" = -ENAMETOOLONG"); |
988 | return ERR_PTR(-ENAMETOOLONG); | |
989 | } | |
990 | ||
5cf9dd55 | 991 | if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) { |
08e0e7c8 DH |
992 | _leave(" = -ESTALE"); |
993 | return ERR_PTR(-ESTALE); | |
994 | } | |
995 | ||
5cf9dd55 | 996 | key = afs_request_key(dvnode->volume->cell); |
00d3b7a4 DH |
997 | if (IS_ERR(key)) { |
998 | _leave(" = %ld [key]", PTR_ERR(key)); | |
e231c2ee | 999 | return ERR_CAST(key); |
00d3b7a4 DH |
1000 | } |
1001 | ||
5cf9dd55 | 1002 | ret = afs_validate(dvnode, key); |
260a9803 DH |
1003 | if (ret < 0) { |
1004 | key_put(key); | |
1005 | _leave(" = %d [val]", ret); | |
1006 | return ERR_PTR(ret); | |
1007 | } | |
1008 | ||
6f8880d8 DH |
1009 | if (dentry->d_name.len >= 4 && |
1010 | dentry->d_name.name[dentry->d_name.len - 4] == '@' && | |
1011 | dentry->d_name.name[dentry->d_name.len - 3] == 's' && | |
1012 | dentry->d_name.name[dentry->d_name.len - 2] == 'y' && | |
1013 | dentry->d_name.name[dentry->d_name.len - 1] == 's') | |
1014 | return afs_lookup_atsys(dir, dentry, key); | |
1015 | ||
d55b4da4 | 1016 | afs_stat_v(dvnode, n_lookup); |
5cf9dd55 | 1017 | inode = afs_do_lookup(dir, dentry, key); |
00d3b7a4 | 1018 | key_put(key); |
f52b83b0 | 1019 | if (inode == ERR_PTR(-ENOENT)) |
34b2a88f | 1020 | inode = afs_try_auto_mntpt(dentry, dir); |
40a708bd DH |
1021 | |
1022 | if (!IS_ERR_OR_NULL(inode)) | |
1023 | fid = AFS_FS_I(inode)->fid; | |
1024 | ||
fed79fd7 | 1025 | _debug("splice %p", dentry->d_inode); |
34b2a88f | 1026 | d = d_splice_alias(inode, dentry); |
80548b03 | 1027 | if (!IS_ERR_OR_NULL(d)) { |
34b2a88f | 1028 | d->d_fsdata = dentry->d_fsdata; |
40a708bd | 1029 | trace_afs_lookup(dvnode, &d->d_name, &fid); |
80548b03 | 1030 | } else { |
40a708bd | 1031 | trace_afs_lookup(dvnode, &dentry->d_name, &fid); |
80548b03 | 1032 | } |
e49c7b2f | 1033 | _leave(""); |
34b2a88f | 1034 | return d; |
ec26815a | 1035 | } |
1da177e4 | 1036 | |
a0753c29 DH |
1037 | /* |
1038 | * Check the validity of a dentry under RCU conditions. | |
1039 | */ | |
1040 | static int afs_d_revalidate_rcu(struct dentry *dentry) | |
1041 | { | |
63d49d84 | 1042 | struct afs_vnode *dvnode; |
a0753c29 | 1043 | struct dentry *parent; |
63d49d84 | 1044 | struct inode *dir; |
a0753c29 DH |
1045 | long dir_version, de_version; |
1046 | ||
1047 | _enter("%p", dentry); | |
1048 | ||
1049 | /* Check the parent directory is still valid first. */ | |
1050 | parent = READ_ONCE(dentry->d_parent); | |
1051 | dir = d_inode_rcu(parent); | |
1052 | if (!dir) | |
1053 | return -ECHILD; | |
1054 | dvnode = AFS_FS_I(dir); | |
1055 | if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) | |
1056 | return -ECHILD; | |
1057 | ||
1058 | if (!afs_check_validity(dvnode)) | |
1059 | return -ECHILD; | |
1060 | ||
1061 | /* We only need to invalidate a dentry if the server's copy changed | |
1062 | * behind our back. If we made the change, it's no problem. Note that | |
1063 | * on a 32-bit system, we only have 32 bits in the dentry to store the | |
1064 | * version. | |
1065 | */ | |
1066 | dir_version = (long)READ_ONCE(dvnode->status.data_version); | |
1067 | de_version = (long)READ_ONCE(dentry->d_fsdata); | |
1068 | if (de_version != dir_version) { | |
1069 | dir_version = (long)READ_ONCE(dvnode->invalid_before); | |
1070 | if (de_version - dir_version < 0) | |
1071 | return -ECHILD; | |
1072 | } | |
1073 | ||
a0753c29 DH |
1074 | return 1; /* Still valid */ |
1075 | } | |
1076 | ||
1da177e4 LT |
1077 | /* |
1078 | * check that a dentry lookup hit has found a valid entry | |
1079 | * - NOTE! the hit can be a negative hit too, so we can't assume we have an | |
1080 | * inode | |
1da177e4 | 1081 | */ |
0b728e19 | 1082 | static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 | 1083 | { |
260a9803 | 1084 | struct afs_vnode *vnode, *dir; |
3f649ab7 | 1085 | struct afs_fid fid; |
1da177e4 | 1086 | struct dentry *parent; |
c435ee34 | 1087 | struct inode *inode; |
00d3b7a4 | 1088 | struct key *key; |
40fc8102 | 1089 | afs_dataversion_t dir_version, invalid_before; |
9dd0b82e | 1090 | long de_version; |
1da177e4 LT |
1091 | int ret; |
1092 | ||
0b728e19 | 1093 | if (flags & LOOKUP_RCU) |
a0753c29 | 1094 | return afs_d_revalidate_rcu(dentry); |
34286d66 | 1095 | |
c435ee34 DH |
1096 | if (d_really_is_positive(dentry)) { |
1097 | vnode = AFS_FS_I(d_inode(dentry)); | |
3b6492df | 1098 | _enter("{v={%llx:%llu} n=%pd fl=%lx},", |
a455589f | 1099 | vnode->fid.vid, vnode->fid.vnode, dentry, |
260a9803 | 1100 | vnode->flags); |
c435ee34 | 1101 | } else { |
a455589f | 1102 | _enter("{neg n=%pd}", dentry); |
c435ee34 | 1103 | } |
1da177e4 | 1104 | |
260a9803 | 1105 | key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); |
00d3b7a4 DH |
1106 | if (IS_ERR(key)) |
1107 | key = NULL; | |
1108 | ||
63d49d84 | 1109 | /* Hold the parent dentry so we can peer at it */ |
08e0e7c8 | 1110 | parent = dget_parent(dentry); |
2b0143b5 | 1111 | dir = AFS_FS_I(d_inode(parent)); |
1da177e4 | 1112 | |
260a9803 | 1113 | /* validate the parent directory */ |
c435ee34 | 1114 | afs_validate(dir, key); |
260a9803 DH |
1115 | |
1116 | if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { | |
a455589f | 1117 | _debug("%pd: parent dir deleted", dentry); |
63d49d84 | 1118 | goto not_found; |
1da177e4 LT |
1119 | } |
1120 | ||
a4ff7401 DH |
1121 | /* We only need to invalidate a dentry if the server's copy changed |
1122 | * behind our back. If we made the change, it's no problem. Note that | |
1123 | * on a 32-bit system, we only have 32 bits in the dentry to store the | |
1124 | * version. | |
1125 | */ | |
9dd0b82e | 1126 | dir_version = dir->status.data_version; |
a4ff7401 | 1127 | de_version = (long)dentry->d_fsdata; |
9dd0b82e | 1128 | if (de_version == (long)dir_version) |
5dc84855 | 1129 | goto out_valid_noupdate; |
a4ff7401 | 1130 | |
40fc8102 DH |
1131 | invalid_before = dir->invalid_before; |
1132 | if (de_version - (long)invalid_before >= 0) | |
a4ff7401 | 1133 | goto out_valid; |
1da177e4 | 1134 | |
260a9803 | 1135 | _debug("dir modified"); |
d55b4da4 | 1136 | afs_stat_v(dir, n_reval); |
260a9803 DH |
1137 | |
1138 | /* search the directory for this vnode */ | |
874c8ca1 | 1139 | ret = afs_do_lookup_one(&dir->netfs.inode, dentry, &fid, key, &dir_version); |
260a9803 DH |
1140 | switch (ret) { |
1141 | case 0: | |
1142 | /* the filename maps to something */ | |
2b0143b5 | 1143 | if (d_really_is_negative(dentry)) |
63d49d84 | 1144 | goto not_found; |
c435ee34 DH |
1145 | inode = d_inode(dentry); |
1146 | if (is_bad_inode(inode)) { | |
a455589f AV |
1147 | printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n", |
1148 | dentry); | |
63d49d84 | 1149 | goto not_found; |
1da177e4 LT |
1150 | } |
1151 | ||
c435ee34 DH |
1152 | vnode = AFS_FS_I(inode); |
1153 | ||
1da177e4 LT |
1154 | /* if the vnode ID has changed, then the dirent points to a |
1155 | * different file */ | |
08e0e7c8 | 1156 | if (fid.vnode != vnode->fid.vnode) { |
3b6492df | 1157 | _debug("%pd: dirent changed [%llu != %llu]", |
a455589f | 1158 | dentry, fid.vnode, |
08e0e7c8 | 1159 | vnode->fid.vnode); |
1da177e4 LT |
1160 | goto not_found; |
1161 | } | |
1162 | ||
1163 | /* if the vnode ID uniqifier has changed, then the file has | |
260a9803 DH |
1164 | * been deleted and replaced, and the original vnode ID has |
1165 | * been reused */ | |
08e0e7c8 | 1166 | if (fid.unique != vnode->fid.unique) { |
a455589f AV |
1167 | _debug("%pd: file deleted (uq %u -> %u I:%u)", |
1168 | dentry, fid.unique, | |
7a224228 | 1169 | vnode->fid.unique, |
874c8ca1 | 1170 | vnode->netfs.inode.i_generation); |
260a9803 | 1171 | goto not_found; |
1da177e4 | 1172 | } |
260a9803 | 1173 | goto out_valid; |
08e0e7c8 | 1174 | |
260a9803 DH |
1175 | case -ENOENT: |
1176 | /* the filename is unknown */ | |
a455589f | 1177 | _debug("%pd: dirent not found", dentry); |
2b0143b5 | 1178 | if (d_really_is_positive(dentry)) |
260a9803 DH |
1179 | goto not_found; |
1180 | goto out_valid; | |
1da177e4 | 1181 | |
260a9803 | 1182 | default: |
a455589f AV |
1183 | _debug("failed to iterate dir %pd: %d", |
1184 | parent, ret); | |
63d49d84 | 1185 | goto not_found; |
08e0e7c8 DH |
1186 | } |
1187 | ||
ec26815a | 1188 | out_valid: |
9dd0b82e | 1189 | dentry->d_fsdata = (void *)(unsigned long)dir_version; |
5dc84855 | 1190 | out_valid_noupdate: |
1da177e4 | 1191 | dput(parent); |
00d3b7a4 | 1192 | key_put(key); |
1da177e4 LT |
1193 | _leave(" = 1 [valid]"); |
1194 | return 1; | |
1195 | ||
ec26815a | 1196 | not_found: |
a455589f | 1197 | _debug("dropping dentry %pd2", dentry); |
1da177e4 | 1198 | dput(parent); |
00d3b7a4 | 1199 | key_put(key); |
1da177e4 LT |
1200 | |
1201 | _leave(" = 0 [bad]"); | |
1202 | return 0; | |
ec26815a | 1203 | } |
1da177e4 | 1204 | |
1da177e4 LT |
1205 | /* |
1206 | * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't | |
1207 | * sleep) | |
1208 | * - called from dput() when d_count is going to 0. | |
1209 | * - return 1 to request dentry be unhashed, 0 otherwise | |
1210 | */ | |
fe15ce44 | 1211 | static int afs_d_delete(const struct dentry *dentry) |
1da177e4 | 1212 | { |
a455589f | 1213 | _enter("%pd", dentry); |
1da177e4 LT |
1214 | |
1215 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1216 | goto zap; | |
1217 | ||
2b0143b5 DH |
1218 | if (d_really_is_positive(dentry) && |
1219 | (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) || | |
1220 | test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags))) | |
bec5eb61 | 1221 | goto zap; |
1da177e4 LT |
1222 | |
1223 | _leave(" = 0 [keep]"); | |
1224 | return 0; | |
1225 | ||
ec26815a | 1226 | zap: |
1da177e4 LT |
1227 | _leave(" = 1 [zap]"); |
1228 | return 1; | |
ec26815a | 1229 | } |
260a9803 | 1230 | |
79ddbfa5 DH |
1231 | /* |
1232 | * Clean up sillyrename files on dentry removal. | |
1233 | */ | |
1234 | static void afs_d_iput(struct dentry *dentry, struct inode *inode) | |
1235 | { | |
1236 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1237 | afs_silly_iput(dentry, inode); | |
1238 | iput(inode); | |
1239 | } | |
1240 | ||
260a9803 DH |
1241 | /* |
1242 | * handle dentry release | |
1243 | */ | |
66c7e1d3 | 1244 | void afs_d_release(struct dentry *dentry) |
260a9803 | 1245 | { |
a455589f | 1246 | _enter("%pd", dentry); |
260a9803 DH |
1247 | } |
1248 | ||
728279a5 DH |
1249 | void afs_check_for_remote_deletion(struct afs_operation *op) |
1250 | { | |
1251 | struct afs_vnode *vnode = op->file[0].vnode; | |
1252 | ||
1253 | switch (op->ac.abort_code) { | |
1254 | case VNOVNODE: | |
1255 | set_bit(AFS_VNODE_DELETED, &vnode->flags); | |
1256 | afs_break_callback(vnode, afs_cb_break_for_deleted); | |
1257 | } | |
1258 | } | |
1259 | ||
d2ddc776 DH |
1260 | /* |
1261 | * Create a new inode for create/mkdir/symlink | |
1262 | */ | |
e49c7b2f | 1263 | static void afs_vnode_new_inode(struct afs_operation *op) |
d2ddc776 | 1264 | { |
e49c7b2f | 1265 | struct afs_vnode_param *vp = &op->file[1]; |
5a813276 | 1266 | struct afs_vnode *vnode; |
d2ddc776 DH |
1267 | struct inode *inode; |
1268 | ||
e49c7b2f DH |
1269 | _enter(""); |
1270 | ||
1271 | ASSERTCMP(op->error, ==, 0); | |
d2ddc776 | 1272 | |
e49c7b2f | 1273 | inode = afs_iget(op, vp); |
d2ddc776 DH |
1274 | if (IS_ERR(inode)) { |
1275 | /* ENOMEM or EINTR at a really inconvenient time - just abandon | |
1276 | * the new directory on the server. | |
1277 | */ | |
e49c7b2f | 1278 | op->error = PTR_ERR(inode); |
d2ddc776 DH |
1279 | return; |
1280 | } | |
1281 | ||
5a813276 DH |
1282 | vnode = AFS_FS_I(inode); |
1283 | set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags); | |
e49c7b2f DH |
1284 | if (!op->error) |
1285 | afs_cache_permit(vnode, op->key, vnode->cb_break, &vp->scb); | |
1286 | d_instantiate(op->dentry, inode); | |
d2ddc776 DH |
1287 | } |
1288 | ||
e49c7b2f | 1289 | static void afs_create_success(struct afs_operation *op) |
b8359153 | 1290 | { |
e49c7b2f | 1291 | _enter("op=%08x", op->debug_id); |
da8d0755 | 1292 | op->ctime = op->file[0].scb.status.mtime_client; |
e49c7b2f DH |
1293 | afs_vnode_commit_status(op, &op->file[0]); |
1294 | afs_update_dentry_version(op, &op->file[0], op->dentry); | |
1295 | afs_vnode_new_inode(op); | |
b8359153 DH |
1296 | } |
1297 | ||
e49c7b2f | 1298 | static void afs_create_edit_dir(struct afs_operation *op) |
9dd0b82e | 1299 | { |
e49c7b2f DH |
1300 | struct afs_vnode_param *dvp = &op->file[0]; |
1301 | struct afs_vnode_param *vp = &op->file[1]; | |
1302 | struct afs_vnode *dvnode = dvp->vnode; | |
1303 | ||
1304 | _enter("op=%08x", op->debug_id); | |
1305 | ||
1306 | down_write(&dvnode->validate_lock); | |
1307 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) && | |
1308 | dvnode->status.data_version == dvp->dv_before + dvp->dv_delta) | |
1309 | afs_edit_dir_add(dvnode, &op->dentry->d_name, &vp->fid, | |
1310 | op->create.reason); | |
1311 | up_write(&dvnode->validate_lock); | |
9dd0b82e DH |
1312 | } |
1313 | ||
e49c7b2f DH |
1314 | static void afs_create_put(struct afs_operation *op) |
1315 | { | |
1316 | _enter("op=%08x", op->debug_id); | |
1317 | ||
1318 | if (op->error) | |
1319 | d_drop(op->dentry); | |
1320 | } | |
1321 | ||
1322 | static const struct afs_operation_ops afs_mkdir_operation = { | |
1323 | .issue_afs_rpc = afs_fs_make_dir, | |
1324 | .issue_yfs_rpc = yfs_fs_make_dir, | |
1325 | .success = afs_create_success, | |
728279a5 | 1326 | .aborted = afs_check_for_remote_deletion, |
e49c7b2f DH |
1327 | .edit_dir = afs_create_edit_dir, |
1328 | .put = afs_create_put, | |
1329 | }; | |
1330 | ||
260a9803 DH |
1331 | /* |
1332 | * create a directory on an AFS filesystem | |
1333 | */ | |
549c7297 CB |
1334 | static int afs_mkdir(struct user_namespace *mnt_userns, struct inode *dir, |
1335 | struct dentry *dentry, umode_t mode) | |
260a9803 | 1336 | { |
e49c7b2f | 1337 | struct afs_operation *op; |
d2ddc776 | 1338 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
260a9803 | 1339 | |
3b6492df | 1340 | _enter("{%llx:%llu},{%pd},%ho", |
a455589f | 1341 | dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); |
260a9803 | 1342 | |
e49c7b2f DH |
1343 | op = afs_alloc_operation(NULL, dvnode->volume); |
1344 | if (IS_ERR(op)) { | |
1345 | d_drop(dentry); | |
1346 | return PTR_ERR(op); | |
2105c282 | 1347 | } |
63a4681f | 1348 | |
e49c7b2f DH |
1349 | afs_op_set_vnode(op, 0, dvnode); |
1350 | op->file[0].dv_delta = 1; | |
22650f14 | 1351 | op->file[0].modification = true; |
da8d0755 | 1352 | op->file[0].update_ctime = true; |
e49c7b2f DH |
1353 | op->dentry = dentry; |
1354 | op->create.mode = S_IFDIR | mode; | |
1355 | op->create.reason = afs_edit_dir_for_mkdir; | |
1356 | op->ops = &afs_mkdir_operation; | |
1357 | return afs_do_sync_operation(op); | |
260a9803 DH |
1358 | } |
1359 | ||
d2ddc776 DH |
1360 | /* |
1361 | * Remove a subdir from a directory. | |
1362 | */ | |
1363 | static void afs_dir_remove_subdir(struct dentry *dentry) | |
1364 | { | |
1365 | if (d_really_is_positive(dentry)) { | |
1366 | struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); | |
1367 | ||
874c8ca1 | 1368 | clear_nlink(&vnode->netfs.inode); |
d2ddc776 DH |
1369 | set_bit(AFS_VNODE_DELETED, &vnode->flags); |
1370 | clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); | |
63a4681f | 1371 | clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags); |
d2ddc776 DH |
1372 | } |
1373 | } | |
1374 | ||
e49c7b2f DH |
1375 | static void afs_rmdir_success(struct afs_operation *op) |
1376 | { | |
1377 | _enter("op=%08x", op->debug_id); | |
da8d0755 | 1378 | op->ctime = op->file[0].scb.status.mtime_client; |
e49c7b2f DH |
1379 | afs_vnode_commit_status(op, &op->file[0]); |
1380 | afs_update_dentry_version(op, &op->file[0], op->dentry); | |
1381 | } | |
1382 | ||
1383 | static void afs_rmdir_edit_dir(struct afs_operation *op) | |
1384 | { | |
1385 | struct afs_vnode_param *dvp = &op->file[0]; | |
1386 | struct afs_vnode *dvnode = dvp->vnode; | |
1387 | ||
1388 | _enter("op=%08x", op->debug_id); | |
1389 | afs_dir_remove_subdir(op->dentry); | |
1390 | ||
1391 | down_write(&dvnode->validate_lock); | |
1392 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) && | |
1393 | dvnode->status.data_version == dvp->dv_before + dvp->dv_delta) | |
1394 | afs_edit_dir_remove(dvnode, &op->dentry->d_name, | |
1395 | afs_edit_dir_for_rmdir); | |
1396 | up_write(&dvnode->validate_lock); | |
1397 | } | |
1398 | ||
1399 | static void afs_rmdir_put(struct afs_operation *op) | |
1400 | { | |
1401 | _enter("op=%08x", op->debug_id); | |
1402 | if (op->file[1].vnode) | |
1403 | up_write(&op->file[1].vnode->rmdir_lock); | |
1404 | } | |
1405 | ||
1406 | static const struct afs_operation_ops afs_rmdir_operation = { | |
1407 | .issue_afs_rpc = afs_fs_remove_dir, | |
1408 | .issue_yfs_rpc = yfs_fs_remove_dir, | |
1409 | .success = afs_rmdir_success, | |
728279a5 | 1410 | .aborted = afs_check_for_remote_deletion, |
e49c7b2f DH |
1411 | .edit_dir = afs_rmdir_edit_dir, |
1412 | .put = afs_rmdir_put, | |
1413 | }; | |
1414 | ||
260a9803 DH |
1415 | /* |
1416 | * remove a directory from an AFS filesystem | |
1417 | */ | |
1418 | static int afs_rmdir(struct inode *dir, struct dentry *dentry) | |
1419 | { | |
e49c7b2f | 1420 | struct afs_operation *op; |
f58db83f | 1421 | struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL; |
260a9803 DH |
1422 | int ret; |
1423 | ||
3b6492df | 1424 | _enter("{%llx:%llu},{%pd}", |
a455589f | 1425 | dvnode->fid.vid, dvnode->fid.vnode, dentry); |
260a9803 | 1426 | |
e49c7b2f DH |
1427 | op = afs_alloc_operation(NULL, dvnode->volume); |
1428 | if (IS_ERR(op)) | |
1429 | return PTR_ERR(op); | |
a58823ac | 1430 | |
e49c7b2f DH |
1431 | afs_op_set_vnode(op, 0, dvnode); |
1432 | op->file[0].dv_delta = 1; | |
22650f14 | 1433 | op->file[0].modification = true; |
da8d0755 | 1434 | op->file[0].update_ctime = true; |
e49c7b2f DH |
1435 | |
1436 | op->dentry = dentry; | |
1437 | op->ops = &afs_rmdir_operation; | |
260a9803 | 1438 | |
f58db83f DH |
1439 | /* Try to make sure we have a callback promise on the victim. */ |
1440 | if (d_really_is_positive(dentry)) { | |
1441 | vnode = AFS_FS_I(d_inode(dentry)); | |
e49c7b2f | 1442 | ret = afs_validate(vnode, op->key); |
f58db83f | 1443 | if (ret < 0) |
e49c7b2f | 1444 | goto error; |
f58db83f DH |
1445 | } |
1446 | ||
79ddbfa5 DH |
1447 | if (vnode) { |
1448 | ret = down_write_killable(&vnode->rmdir_lock); | |
1449 | if (ret < 0) | |
e49c7b2f DH |
1450 | goto error; |
1451 | op->file[1].vnode = vnode; | |
79ddbfa5 DH |
1452 | } |
1453 | ||
e49c7b2f | 1454 | return afs_do_sync_operation(op); |
260a9803 | 1455 | |
260a9803 | 1456 | error: |
e49c7b2f | 1457 | return afs_put_operation(op); |
260a9803 DH |
1458 | } |
1459 | ||
1460 | /* | |
d2ddc776 DH |
1461 | * Remove a link to a file or symlink from a directory. |
1462 | * | |
1463 | * If the file was not deleted due to excess hard links, the fileserver will | |
1464 | * break the callback promise on the file - if it had one - before it returns | |
1465 | * to us, and if it was deleted, it won't | |
1466 | * | |
1467 | * However, if we didn't have a callback promise outstanding, or it was | |
1468 | * outstanding on a different server, then it won't break it either... | |
1469 | */ | |
e49c7b2f | 1470 | static void afs_dir_remove_link(struct afs_operation *op) |
d2ddc776 | 1471 | { |
e49c7b2f DH |
1472 | struct afs_vnode *dvnode = op->file[0].vnode; |
1473 | struct afs_vnode *vnode = op->file[1].vnode; | |
1474 | struct dentry *dentry = op->dentry; | |
1475 | int ret; | |
d2ddc776 | 1476 | |
e49c7b2f DH |
1477 | if (op->error != 0 || |
1478 | (op->file[1].scb.have_status && op->file[1].scb.have_error)) | |
1479 | return; | |
1480 | if (d_really_is_positive(dentry)) | |
1481 | return; | |
d2ddc776 | 1482 | |
e49c7b2f DH |
1483 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { |
1484 | /* Already done */ | |
1485 | } else if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { | |
1486 | write_seqlock(&vnode->cb_lock); | |
874c8ca1 DH |
1487 | drop_nlink(&vnode->netfs.inode); |
1488 | if (vnode->netfs.inode.i_nlink == 0) { | |
e49c7b2f DH |
1489 | set_bit(AFS_VNODE_DELETED, &vnode->flags); |
1490 | __afs_break_callback(vnode, afs_cb_break_for_unlink); | |
1491 | } | |
1492 | write_sequnlock(&vnode->cb_lock); | |
1493 | } else { | |
1494 | afs_break_callback(vnode, afs_cb_break_for_unlink); | |
440fbc3a | 1495 | |
e49c7b2f DH |
1496 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) |
1497 | _debug("AFS_VNODE_DELETED"); | |
440fbc3a | 1498 | |
e49c7b2f DH |
1499 | ret = afs_validate(vnode, op->key); |
1500 | if (ret != -ESTALE) | |
1501 | op->error = ret; | |
d2ddc776 DH |
1502 | } |
1503 | ||
874c8ca1 | 1504 | _debug("nlink %d [val %d]", vnode->netfs.inode.i_nlink, op->error); |
e49c7b2f DH |
1505 | } |
1506 | ||
1507 | static void afs_unlink_success(struct afs_operation *op) | |
1508 | { | |
1509 | _enter("op=%08x", op->debug_id); | |
da8d0755 | 1510 | op->ctime = op->file[0].scb.status.mtime_client; |
b6489a49 | 1511 | afs_check_dir_conflict(op, &op->file[0]); |
e49c7b2f DH |
1512 | afs_vnode_commit_status(op, &op->file[0]); |
1513 | afs_vnode_commit_status(op, &op->file[1]); | |
1514 | afs_update_dentry_version(op, &op->file[0], op->dentry); | |
1515 | afs_dir_remove_link(op); | |
1516 | } | |
1517 | ||
1518 | static void afs_unlink_edit_dir(struct afs_operation *op) | |
1519 | { | |
1520 | struct afs_vnode_param *dvp = &op->file[0]; | |
1521 | struct afs_vnode *dvnode = dvp->vnode; | |
1522 | ||
1523 | _enter("op=%08x", op->debug_id); | |
1524 | down_write(&dvnode->validate_lock); | |
1525 | if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) && | |
1526 | dvnode->status.data_version == dvp->dv_before + dvp->dv_delta) | |
1527 | afs_edit_dir_remove(dvnode, &op->dentry->d_name, | |
1528 | afs_edit_dir_for_unlink); | |
1529 | up_write(&dvnode->validate_lock); | |
d2ddc776 DH |
1530 | } |
1531 | ||
e49c7b2f DH |
1532 | static void afs_unlink_put(struct afs_operation *op) |
1533 | { | |
1534 | _enter("op=%08x", op->debug_id); | |
1535 | if (op->unlink.need_rehash && op->error < 0 && op->error != -ENOENT) | |
1536 | d_rehash(op->dentry); | |
1537 | } | |
1538 | ||
1539 | static const struct afs_operation_ops afs_unlink_operation = { | |
1540 | .issue_afs_rpc = afs_fs_remove_file, | |
1541 | .issue_yfs_rpc = yfs_fs_remove_file, | |
1542 | .success = afs_unlink_success, | |
728279a5 | 1543 | .aborted = afs_check_for_remote_deletion, |
e49c7b2f DH |
1544 | .edit_dir = afs_unlink_edit_dir, |
1545 | .put = afs_unlink_put, | |
1546 | }; | |
1547 | ||
d2ddc776 DH |
1548 | /* |
1549 | * Remove a file or symlink from an AFS filesystem. | |
260a9803 DH |
1550 | */ |
1551 | static int afs_unlink(struct inode *dir, struct dentry *dentry) | |
1552 | { | |
e49c7b2f | 1553 | struct afs_operation *op; |
fa59f52f DH |
1554 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
1555 | struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); | |
260a9803 DH |
1556 | int ret; |
1557 | ||
3b6492df | 1558 | _enter("{%llx:%llu},{%pd}", |
a455589f | 1559 | dvnode->fid.vid, dvnode->fid.vnode, dentry); |
260a9803 | 1560 | |
45222b9e | 1561 | if (dentry->d_name.len >= AFSNAMEMAX) |
d2ddc776 | 1562 | return -ENAMETOOLONG; |
260a9803 | 1563 | |
e49c7b2f DH |
1564 | op = afs_alloc_operation(NULL, dvnode->volume); |
1565 | if (IS_ERR(op)) | |
1566 | return PTR_ERR(op); | |
a58823ac | 1567 | |
e49c7b2f DH |
1568 | afs_op_set_vnode(op, 0, dvnode); |
1569 | op->file[0].dv_delta = 1; | |
22650f14 | 1570 | op->file[0].modification = true; |
da8d0755 | 1571 | op->file[0].update_ctime = true; |
260a9803 | 1572 | |
d2ddc776 | 1573 | /* Try to make sure we have a callback promise on the victim. */ |
e49c7b2f DH |
1574 | ret = afs_validate(vnode, op->key); |
1575 | if (ret < 0) { | |
1576 | op->error = ret; | |
1577 | goto error; | |
1578 | } | |
260a9803 | 1579 | |
79ddbfa5 | 1580 | spin_lock(&dentry->d_lock); |
fa59f52f | 1581 | if (d_count(dentry) > 1) { |
79ddbfa5 DH |
1582 | spin_unlock(&dentry->d_lock); |
1583 | /* Start asynchronous writeout of the inode */ | |
1584 | write_inode_now(d_inode(dentry), 0); | |
e49c7b2f DH |
1585 | op->error = afs_sillyrename(dvnode, vnode, dentry, op->key); |
1586 | goto error; | |
79ddbfa5 DH |
1587 | } |
1588 | if (!d_unhashed(dentry)) { | |
1589 | /* Prevent a race with RCU lookup. */ | |
1590 | __d_drop(dentry); | |
e49c7b2f | 1591 | op->unlink.need_rehash = true; |
79ddbfa5 DH |
1592 | } |
1593 | spin_unlock(&dentry->d_lock); | |
1594 | ||
e49c7b2f | 1595 | op->file[1].vnode = vnode; |
da8d0755 | 1596 | op->file[1].update_ctime = true; |
b6489a49 | 1597 | op->file[1].op_unlinked = true; |
e49c7b2f DH |
1598 | op->dentry = dentry; |
1599 | op->ops = &afs_unlink_operation; | |
b6489a49 DH |
1600 | afs_begin_vnode_operation(op); |
1601 | afs_wait_for_operation(op); | |
1602 | ||
1603 | /* If there was a conflict with a third party, check the status of the | |
1604 | * unlinked vnode. | |
1605 | */ | |
1606 | if (op->error == 0 && (op->flags & AFS_OPERATION_DIR_CONFLICT)) { | |
1607 | op->file[1].update_ctime = false; | |
1608 | op->fetch_status.which = 1; | |
1609 | op->ops = &afs_fetch_status_operation; | |
1610 | afs_begin_vnode_operation(op); | |
1611 | afs_wait_for_operation(op); | |
1612 | } | |
1613 | ||
1614 | return afs_put_operation(op); | |
79ddbfa5 | 1615 | |
260a9803 | 1616 | error: |
e49c7b2f | 1617 | return afs_put_operation(op); |
260a9803 DH |
1618 | } |
1619 | ||
e49c7b2f DH |
1620 | static const struct afs_operation_ops afs_create_operation = { |
1621 | .issue_afs_rpc = afs_fs_create_file, | |
1622 | .issue_yfs_rpc = yfs_fs_create_file, | |
1623 | .success = afs_create_success, | |
728279a5 | 1624 | .aborted = afs_check_for_remote_deletion, |
e49c7b2f DH |
1625 | .edit_dir = afs_create_edit_dir, |
1626 | .put = afs_create_put, | |
1627 | }; | |
1628 | ||
260a9803 DH |
1629 | /* |
1630 | * create a regular file on an AFS filesystem | |
1631 | */ | |
549c7297 CB |
1632 | static int afs_create(struct user_namespace *mnt_userns, struct inode *dir, |
1633 | struct dentry *dentry, umode_t mode, bool excl) | |
260a9803 | 1634 | { |
e49c7b2f | 1635 | struct afs_operation *op; |
43dd388b | 1636 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
e49c7b2f | 1637 | int ret = -ENAMETOOLONG; |
260a9803 | 1638 | |
e49c7b2f | 1639 | _enter("{%llx:%llu},{%pd},%ho", |
a455589f | 1640 | dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); |
260a9803 | 1641 | |
d2ddc776 DH |
1642 | if (dentry->d_name.len >= AFSNAMEMAX) |
1643 | goto error; | |
1644 | ||
e49c7b2f DH |
1645 | op = afs_alloc_operation(NULL, dvnode->volume); |
1646 | if (IS_ERR(op)) { | |
1647 | ret = PTR_ERR(op); | |
260a9803 DH |
1648 | goto error; |
1649 | } | |
1650 | ||
e49c7b2f DH |
1651 | afs_op_set_vnode(op, 0, dvnode); |
1652 | op->file[0].dv_delta = 1; | |
22650f14 | 1653 | op->file[0].modification = true; |
da8d0755 | 1654 | op->file[0].update_ctime = true; |
63a4681f | 1655 | |
e49c7b2f DH |
1656 | op->dentry = dentry; |
1657 | op->create.mode = S_IFREG | mode; | |
1658 | op->create.reason = afs_edit_dir_for_create; | |
1659 | op->ops = &afs_create_operation; | |
1660 | return afs_do_sync_operation(op); | |
260a9803 | 1661 | |
260a9803 DH |
1662 | error: |
1663 | d_drop(dentry); | |
1664 | _leave(" = %d", ret); | |
1665 | return ret; | |
1666 | } | |
1667 | ||
e49c7b2f DH |
1668 | static void afs_link_success(struct afs_operation *op) |
1669 | { | |
1670 | struct afs_vnode_param *dvp = &op->file[0]; | |
1671 | struct afs_vnode_param *vp = &op->file[1]; | |
1672 | ||
1673 | _enter("op=%08x", op->debug_id); | |
da8d0755 | 1674 | op->ctime = dvp->scb.status.mtime_client; |
e49c7b2f DH |
1675 | afs_vnode_commit_status(op, dvp); |
1676 | afs_vnode_commit_status(op, vp); | |
1677 | afs_update_dentry_version(op, dvp, op->dentry); | |
1678 | if (op->dentry_2->d_parent == op->dentry->d_parent) | |
1679 | afs_update_dentry_version(op, dvp, op->dentry_2); | |
874c8ca1 DH |
1680 | ihold(&vp->vnode->netfs.inode); |
1681 | d_instantiate(op->dentry, &vp->vnode->netfs.inode); | |
e49c7b2f DH |
1682 | } |
1683 | ||
1684 | static void afs_link_put(struct afs_operation *op) | |
1685 | { | |
1686 | _enter("op=%08x", op->debug_id); | |
1687 | if (op->error) | |
1688 | d_drop(op->dentry); | |
1689 | } | |
1690 | ||
1691 | static const struct afs_operation_ops afs_link_operation = { | |
1692 | .issue_afs_rpc = afs_fs_link, | |
1693 | .issue_yfs_rpc = yfs_fs_link, | |
1694 | .success = afs_link_success, | |
728279a5 | 1695 | .aborted = afs_check_for_remote_deletion, |
e49c7b2f DH |
1696 | .edit_dir = afs_create_edit_dir, |
1697 | .put = afs_link_put, | |
1698 | }; | |
1699 | ||
260a9803 DH |
1700 | /* |
1701 | * create a hard link between files in an AFS filesystem | |
1702 | */ | |
1703 | static int afs_link(struct dentry *from, struct inode *dir, | |
1704 | struct dentry *dentry) | |
1705 | { | |
e49c7b2f | 1706 | struct afs_operation *op; |
a58823ac DH |
1707 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
1708 | struct afs_vnode *vnode = AFS_FS_I(d_inode(from)); | |
e49c7b2f | 1709 | int ret = -ENAMETOOLONG; |
260a9803 | 1710 | |
3b6492df | 1711 | _enter("{%llx:%llu},{%llx:%llu},{%pd}", |
260a9803 DH |
1712 | vnode->fid.vid, vnode->fid.vnode, |
1713 | dvnode->fid.vid, dvnode->fid.vnode, | |
a455589f | 1714 | dentry); |
260a9803 | 1715 | |
d2ddc776 DH |
1716 | if (dentry->d_name.len >= AFSNAMEMAX) |
1717 | goto error; | |
1718 | ||
e49c7b2f DH |
1719 | op = afs_alloc_operation(NULL, dvnode->volume); |
1720 | if (IS_ERR(op)) { | |
1721 | ret = PTR_ERR(op); | |
a58823ac | 1722 | goto error; |
260a9803 DH |
1723 | } |
1724 | ||
3978d816 DH |
1725 | ret = afs_validate(vnode, op->key); |
1726 | if (ret < 0) | |
1727 | goto error_op; | |
1728 | ||
e49c7b2f DH |
1729 | afs_op_set_vnode(op, 0, dvnode); |
1730 | afs_op_set_vnode(op, 1, vnode); | |
1731 | op->file[0].dv_delta = 1; | |
22650f14 | 1732 | op->file[0].modification = true; |
da8d0755 DH |
1733 | op->file[0].update_ctime = true; |
1734 | op->file[1].update_ctime = true; | |
260a9803 | 1735 | |
e49c7b2f DH |
1736 | op->dentry = dentry; |
1737 | op->dentry_2 = from; | |
1738 | op->ops = &afs_link_operation; | |
1739 | op->create.reason = afs_edit_dir_for_link; | |
1740 | return afs_do_sync_operation(op); | |
63a4681f | 1741 | |
3978d816 DH |
1742 | error_op: |
1743 | afs_put_operation(op); | |
260a9803 DH |
1744 | error: |
1745 | d_drop(dentry); | |
1746 | _leave(" = %d", ret); | |
1747 | return ret; | |
1748 | } | |
1749 | ||
e49c7b2f DH |
1750 | static const struct afs_operation_ops afs_symlink_operation = { |
1751 | .issue_afs_rpc = afs_fs_symlink, | |
1752 | .issue_yfs_rpc = yfs_fs_symlink, | |
1753 | .success = afs_create_success, | |
728279a5 | 1754 | .aborted = afs_check_for_remote_deletion, |
e49c7b2f DH |
1755 | .edit_dir = afs_create_edit_dir, |
1756 | .put = afs_create_put, | |
1757 | }; | |
1758 | ||
260a9803 DH |
1759 | /* |
1760 | * create a symlink in an AFS filesystem | |
1761 | */ | |
549c7297 CB |
1762 | static int afs_symlink(struct user_namespace *mnt_userns, struct inode *dir, |
1763 | struct dentry *dentry, const char *content) | |
260a9803 | 1764 | { |
e49c7b2f | 1765 | struct afs_operation *op; |
d2ddc776 | 1766 | struct afs_vnode *dvnode = AFS_FS_I(dir); |
260a9803 DH |
1767 | int ret; |
1768 | ||
3b6492df | 1769 | _enter("{%llx:%llu},{%pd},%s", |
a455589f | 1770 | dvnode->fid.vid, dvnode->fid.vnode, dentry, |
260a9803 DH |
1771 | content); |
1772 | ||
d2ddc776 DH |
1773 | ret = -ENAMETOOLONG; |
1774 | if (dentry->d_name.len >= AFSNAMEMAX) | |
1775 | goto error; | |
1776 | ||
260a9803 | 1777 | ret = -EINVAL; |
45222b9e | 1778 | if (strlen(content) >= AFSPATHMAX) |
260a9803 DH |
1779 | goto error; |
1780 | ||
e49c7b2f DH |
1781 | op = afs_alloc_operation(NULL, dvnode->volume); |
1782 | if (IS_ERR(op)) { | |
1783 | ret = PTR_ERR(op); | |
a58823ac | 1784 | goto error; |
260a9803 DH |
1785 | } |
1786 | ||
e49c7b2f DH |
1787 | afs_op_set_vnode(op, 0, dvnode); |
1788 | op->file[0].dv_delta = 1; | |
260a9803 | 1789 | |
e49c7b2f DH |
1790 | op->dentry = dentry; |
1791 | op->ops = &afs_symlink_operation; | |
1792 | op->create.reason = afs_edit_dir_for_symlink; | |
1793 | op->create.symlink = content; | |
1794 | return afs_do_sync_operation(op); | |
260a9803 | 1795 | |
260a9803 DH |
1796 | error: |
1797 | d_drop(dentry); | |
1798 | _leave(" = %d", ret); | |
1799 | return ret; | |
1800 | } | |
1801 | ||
e49c7b2f DH |
1802 | static void afs_rename_success(struct afs_operation *op) |
1803 | { | |
1804 | _enter("op=%08x", op->debug_id); | |
1805 | ||
da8d0755 | 1806 | op->ctime = op->file[0].scb.status.mtime_client; |
b6489a49 | 1807 | afs_check_dir_conflict(op, &op->file[1]); |
e49c7b2f | 1808 | afs_vnode_commit_status(op, &op->file[0]); |
da8d0755 DH |
1809 | if (op->file[1].vnode != op->file[0].vnode) { |
1810 | op->ctime = op->file[1].scb.status.mtime_client; | |
e49c7b2f | 1811 | afs_vnode_commit_status(op, &op->file[1]); |
da8d0755 | 1812 | } |
e49c7b2f DH |
1813 | } |
1814 | ||
1815 | static void afs_rename_edit_dir(struct afs_operation *op) | |
1816 | { | |
1817 | struct afs_vnode_param *orig_dvp = &op->file[0]; | |
1818 | struct afs_vnode_param *new_dvp = &op->file[1]; | |
1819 | struct afs_vnode *orig_dvnode = orig_dvp->vnode; | |
1820 | struct afs_vnode *new_dvnode = new_dvp->vnode; | |
1821 | struct afs_vnode *vnode = AFS_FS_I(d_inode(op->dentry)); | |
1822 | struct dentry *old_dentry = op->dentry; | |
1823 | struct dentry *new_dentry = op->dentry_2; | |
1824 | struct inode *new_inode; | |
1825 | ||
1826 | _enter("op=%08x", op->debug_id); | |
1827 | ||
1828 | if (op->rename.rehash) { | |
1829 | d_rehash(op->rename.rehash); | |
1830 | op->rename.rehash = NULL; | |
1831 | } | |
1832 | ||
1833 | down_write(&orig_dvnode->validate_lock); | |
1834 | if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags) && | |
1835 | orig_dvnode->status.data_version == orig_dvp->dv_before + orig_dvp->dv_delta) | |
1836 | afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name, | |
1837 | afs_edit_dir_for_rename_0); | |
1838 | ||
1839 | if (new_dvnode != orig_dvnode) { | |
1840 | up_write(&orig_dvnode->validate_lock); | |
1841 | down_write(&new_dvnode->validate_lock); | |
1842 | } | |
1843 | ||
1844 | if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags) && | |
1845 | new_dvnode->status.data_version == new_dvp->dv_before + new_dvp->dv_delta) { | |
1846 | if (!op->rename.new_negative) | |
1847 | afs_edit_dir_remove(new_dvnode, &new_dentry->d_name, | |
1848 | afs_edit_dir_for_rename_1); | |
1849 | ||
1850 | afs_edit_dir_add(new_dvnode, &new_dentry->d_name, | |
1851 | &vnode->fid, afs_edit_dir_for_rename_2); | |
1852 | } | |
1853 | ||
1854 | new_inode = d_inode(new_dentry); | |
1855 | if (new_inode) { | |
1856 | spin_lock(&new_inode->i_lock); | |
f610a5a2 DH |
1857 | if (S_ISDIR(new_inode->i_mode)) |
1858 | clear_nlink(new_inode); | |
1859 | else if (new_inode->i_nlink > 0) | |
e49c7b2f DH |
1860 | drop_nlink(new_inode); |
1861 | spin_unlock(&new_inode->i_lock); | |
1862 | } | |
1863 | ||
1864 | /* Now we can update d_fsdata on the dentries to reflect their | |
1865 | * new parent's data_version. | |
1866 | * | |
1867 | * Note that if we ever implement RENAME_EXCHANGE, we'll have | |
1868 | * to update both dentries with opposing dir versions. | |
1869 | */ | |
1870 | afs_update_dentry_version(op, new_dvp, op->dentry); | |
1871 | afs_update_dentry_version(op, new_dvp, op->dentry_2); | |
1872 | ||
1873 | d_move(old_dentry, new_dentry); | |
1874 | ||
1875 | up_write(&new_dvnode->validate_lock); | |
1876 | } | |
1877 | ||
1878 | static void afs_rename_put(struct afs_operation *op) | |
1879 | { | |
1880 | _enter("op=%08x", op->debug_id); | |
1881 | if (op->rename.rehash) | |
1882 | d_rehash(op->rename.rehash); | |
1883 | dput(op->rename.tmp); | |
1884 | if (op->error) | |
1885 | d_rehash(op->dentry); | |
1886 | } | |
1887 | ||
1888 | static const struct afs_operation_ops afs_rename_operation = { | |
1889 | .issue_afs_rpc = afs_fs_rename, | |
1890 | .issue_yfs_rpc = yfs_fs_rename, | |
1891 | .success = afs_rename_success, | |
1892 | .edit_dir = afs_rename_edit_dir, | |
1893 | .put = afs_rename_put, | |
1894 | }; | |
1895 | ||
260a9803 DH |
1896 | /* |
1897 | * rename a file in an AFS filesystem and/or move it between directories | |
1898 | */ | |
549c7297 CB |
1899 | static int afs_rename(struct user_namespace *mnt_userns, struct inode *old_dir, |
1900 | struct dentry *old_dentry, struct inode *new_dir, | |
1901 | struct dentry *new_dentry, unsigned int flags) | |
260a9803 | 1902 | { |
e49c7b2f | 1903 | struct afs_operation *op; |
260a9803 | 1904 | struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; |
260a9803 DH |
1905 | int ret; |
1906 | ||
1cd66c93 MS |
1907 | if (flags) |
1908 | return -EINVAL; | |
1909 | ||
79ddbfa5 DH |
1910 | /* Don't allow silly-rename files be moved around. */ |
1911 | if (old_dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
1912 | return -EINVAL; | |
1913 | ||
2b0143b5 | 1914 | vnode = AFS_FS_I(d_inode(old_dentry)); |
260a9803 DH |
1915 | orig_dvnode = AFS_FS_I(old_dir); |
1916 | new_dvnode = AFS_FS_I(new_dir); | |
1917 | ||
3b6492df | 1918 | _enter("{%llx:%llu},{%llx:%llu},{%llx:%llu},{%pd}", |
260a9803 DH |
1919 | orig_dvnode->fid.vid, orig_dvnode->fid.vnode, |
1920 | vnode->fid.vid, vnode->fid.vnode, | |
1921 | new_dvnode->fid.vid, new_dvnode->fid.vnode, | |
a455589f | 1922 | new_dentry); |
260a9803 | 1923 | |
e49c7b2f DH |
1924 | op = afs_alloc_operation(NULL, orig_dvnode->volume); |
1925 | if (IS_ERR(op)) | |
1926 | return PTR_ERR(op); | |
a58823ac | 1927 | |
3978d816 DH |
1928 | ret = afs_validate(vnode, op->key); |
1929 | op->error = ret; | |
1930 | if (ret < 0) | |
1931 | goto error; | |
1932 | ||
e49c7b2f DH |
1933 | afs_op_set_vnode(op, 0, orig_dvnode); |
1934 | afs_op_set_vnode(op, 1, new_dvnode); /* May be same as orig_dvnode */ | |
1935 | op->file[0].dv_delta = 1; | |
1936 | op->file[1].dv_delta = 1; | |
22650f14 DH |
1937 | op->file[0].modification = true; |
1938 | op->file[1].modification = true; | |
da8d0755 DH |
1939 | op->file[0].update_ctime = true; |
1940 | op->file[1].update_ctime = true; | |
e49c7b2f DH |
1941 | |
1942 | op->dentry = old_dentry; | |
1943 | op->dentry_2 = new_dentry; | |
1944 | op->rename.new_negative = d_is_negative(new_dentry); | |
1945 | op->ops = &afs_rename_operation; | |
260a9803 | 1946 | |
79ddbfa5 DH |
1947 | /* For non-directories, check whether the target is busy and if so, |
1948 | * make a copy of the dentry and then do a silly-rename. If the | |
1949 | * silly-rename succeeds, the copied dentry is hashed and becomes the | |
1950 | * new target. | |
1951 | */ | |
1952 | if (d_is_positive(new_dentry) && !d_is_dir(new_dentry)) { | |
1953 | /* To prevent any new references to the target during the | |
1954 | * rename, we unhash the dentry in advance. | |
1955 | */ | |
1956 | if (!d_unhashed(new_dentry)) { | |
1957 | d_drop(new_dentry); | |
e49c7b2f | 1958 | op->rename.rehash = new_dentry; |
79ddbfa5 DH |
1959 | } |
1960 | ||
1961 | if (d_count(new_dentry) > 2) { | |
1962 | /* copy the target dentry's name */ | |
e49c7b2f DH |
1963 | op->rename.tmp = d_alloc(new_dentry->d_parent, |
1964 | &new_dentry->d_name); | |
b4280812 JC |
1965 | if (!op->rename.tmp) { |
1966 | op->error = -ENOMEM; | |
e49c7b2f | 1967 | goto error; |
b4280812 | 1968 | } |
79ddbfa5 DH |
1969 | |
1970 | ret = afs_sillyrename(new_dvnode, | |
1971 | AFS_FS_I(d_inode(new_dentry)), | |
e49c7b2f | 1972 | new_dentry, op->key); |
b4280812 JC |
1973 | if (ret) { |
1974 | op->error = ret; | |
e49c7b2f | 1975 | goto error; |
b4280812 | 1976 | } |
79ddbfa5 | 1977 | |
e49c7b2f DH |
1978 | op->dentry_2 = op->rename.tmp; |
1979 | op->rename.rehash = NULL; | |
1980 | op->rename.new_negative = true; | |
79ddbfa5 DH |
1981 | } |
1982 | } | |
1983 | ||
9dd0b82e DH |
1984 | /* This bit is potentially nasty as there's a potential race with |
1985 | * afs_d_revalidate{,_rcu}(). We have to change d_fsdata on the dentry | |
1986 | * to reflect it's new parent's new data_version after the op, but | |
1987 | * d_revalidate may see old_dentry between the op having taken place | |
1988 | * and the version being updated. | |
1989 | * | |
1990 | * So drop the old_dentry for now to make other threads go through | |
1991 | * lookup instead - which we hold a lock against. | |
1992 | */ | |
1993 | d_drop(old_dentry); | |
1994 | ||
e49c7b2f | 1995 | return afs_do_sync_operation(op); |
63a4681f | 1996 | |
260a9803 | 1997 | error: |
e49c7b2f | 1998 | return afs_put_operation(op); |
260a9803 | 1999 | } |
f3ddee8d DH |
2000 | |
2001 | /* | |
255ed636 DH |
2002 | * Release a directory folio and clean up its private state if it's not busy |
2003 | * - return true if the folio can now be released, false if not | |
f3ddee8d | 2004 | */ |
508cae68 | 2005 | static bool afs_dir_release_folio(struct folio *folio, gfp_t gfp_flags) |
f3ddee8d | 2006 | { |
255ed636 | 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 | */ |
f6bc6fb8 MWO |
2022 | static void afs_dir_invalidate_folio(struct folio *folio, size_t offset, |
2023 | size_t length) | |
f3ddee8d | 2024 | { |
255ed636 | 2025 | struct afs_vnode *dvnode = AFS_FS_I(folio_inode(folio)); |
f3ddee8d | 2026 | |
f6bc6fb8 | 2027 | _enter("{%lu},%zu,%zu", folio->index, offset, length); |
f3ddee8d | 2028 | |
255ed636 | 2029 | BUG_ON(!folio_test_locked(folio)); |
f3ddee8d DH |
2030 | |
2031 | /* The directory will need reloading. */ | |
2032 | if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) | |
2033 | afs_stat_v(dvnode, n_inval); | |
2034 | ||
255ed636 DH |
2035 | /* we clean up only if the entire folio is being invalidated */ |
2036 | if (offset == 0 && length == folio_size(folio)) | |
2037 | folio_detach_private(folio); | |
f3ddee8d | 2038 | } |