Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | |
2 | /* | |
3 | * Directory operations for Coda filesystem | |
4 | * Original version: (C) 1996 P. Braam and M. Callahan | |
5 | * Rewritten for Linux 2.1. (C) 1997 Carnegie Mellon University | |
6 | * | |
7 | * Carnegie Mellon encourages users to contribute improvements to | |
8 | * the Coda project. Contact Peter Braam (coda@cs.cmu.edu). | |
9 | */ | |
10 | ||
11 | #include <linux/types.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/time.h> | |
14 | #include <linux/fs.h> | |
15 | #include <linux/file.h> | |
16 | #include <linux/stat.h> | |
17 | #include <linux/errno.h> | |
18 | #include <linux/string.h> | |
19 | #include <linux/smp_lock.h> | |
20 | ||
21 | #include <asm/uaccess.h> | |
22 | ||
23 | #include <linux/coda.h> | |
24 | #include <linux/coda_linux.h> | |
25 | #include <linux/coda_psdev.h> | |
26 | #include <linux/coda_fs_i.h> | |
27 | #include <linux/coda_cache.h> | |
28 | #include <linux/coda_proc.h> | |
29 | ||
c98d8cfb AB |
30 | #include "coda_int.h" |
31 | ||
1da177e4 LT |
32 | /* dir inode-ops */ |
33 | static int coda_create(struct inode *dir, struct dentry *new, int mode, struct nameidata *nd); | |
34 | static struct dentry *coda_lookup(struct inode *dir, struct dentry *target, struct nameidata *nd); | |
35 | static int coda_link(struct dentry *old_dentry, struct inode *dir_inode, | |
36 | struct dentry *entry); | |
37 | static int coda_unlink(struct inode *dir_inode, struct dentry *entry); | |
38 | static int coda_symlink(struct inode *dir_inode, struct dentry *entry, | |
39 | const char *symname); | |
40 | static int coda_mkdir(struct inode *dir_inode, struct dentry *entry, int mode); | |
41 | static int coda_rmdir(struct inode *dir_inode, struct dentry *entry); | |
42 | static int coda_rename(struct inode *old_inode, struct dentry *old_dentry, | |
43 | struct inode *new_inode, struct dentry *new_dentry); | |
44 | ||
45 | /* dir file-ops */ | |
46 | static int coda_readdir(struct file *file, void *dirent, filldir_t filldir); | |
47 | ||
48 | /* dentry ops */ | |
49 | static int coda_dentry_revalidate(struct dentry *de, struct nameidata *nd); | |
50 | static int coda_dentry_delete(struct dentry *); | |
51 | ||
52 | /* support routines */ | |
53 | static int coda_venus_readdir(struct file *filp, filldir_t filldir, | |
54 | void *dirent, struct dentry *dir); | |
1da177e4 LT |
55 | |
56 | /* same as fs/bad_inode.c */ | |
57 | static int coda_return_EIO(void) | |
58 | { | |
59 | return -EIO; | |
60 | } | |
61 | #define CODA_EIO_ERROR ((void *) (coda_return_EIO)) | |
62 | ||
63 | static struct dentry_operations coda_dentry_operations = | |
64 | { | |
65 | .d_revalidate = coda_dentry_revalidate, | |
66 | .d_delete = coda_dentry_delete, | |
67 | }; | |
68 | ||
754661f1 | 69 | const struct inode_operations coda_dir_inode_operations = |
1da177e4 LT |
70 | { |
71 | .create = coda_create, | |
72 | .lookup = coda_lookup, | |
73 | .link = coda_link, | |
74 | .unlink = coda_unlink, | |
75 | .symlink = coda_symlink, | |
76 | .mkdir = coda_mkdir, | |
77 | .rmdir = coda_rmdir, | |
78 | .mknod = CODA_EIO_ERROR, | |
79 | .rename = coda_rename, | |
80 | .permission = coda_permission, | |
81 | .getattr = coda_getattr, | |
82 | .setattr = coda_setattr, | |
83 | }; | |
84 | ||
4b6f5d20 | 85 | const struct file_operations coda_dir_operations = { |
1da177e4 LT |
86 | .llseek = generic_file_llseek, |
87 | .read = generic_read_dir, | |
88 | .readdir = coda_readdir, | |
89 | .open = coda_open, | |
90 | .flush = coda_flush, | |
91 | .release = coda_release, | |
92 | .fsync = coda_fsync, | |
93 | }; | |
94 | ||
95 | ||
96 | /* inode operations for directories */ | |
97 | /* access routines: lookup, readlink, permission */ | |
98 | static struct dentry *coda_lookup(struct inode *dir, struct dentry *entry, struct nameidata *nd) | |
99 | { | |
100 | struct inode *res_inode = NULL; | |
101 | struct CodaFid resfid = { { 0, } }; | |
102 | int dropme = 0; /* to indicate entry should not be cached */ | |
103 | int type = 0; | |
104 | int error = 0; | |
105 | const char *name = entry->d_name.name; | |
106 | size_t length = entry->d_name.len; | |
107 | ||
108 | if ( length > CODA_MAXNAMLEN ) { | |
109 | printk("name too long: lookup, %s (%*s)\n", | |
110 | coda_i2s(dir), (int)length, name); | |
111 | return ERR_PTR(-ENAMETOOLONG); | |
112 | } | |
113 | ||
114 | lock_kernel(); | |
115 | /* control object, create inode on the fly */ | |
116 | if (coda_isroot(dir) && coda_iscontrol(name, length)) { | |
117 | error = coda_cnode_makectl(&res_inode, dir->i_sb); | |
118 | dropme = 1; | |
119 | goto exit; | |
120 | } | |
121 | ||
122 | error = venus_lookup(dir->i_sb, coda_i2f(dir), | |
123 | (const char *)name, length, &type, &resfid); | |
124 | ||
125 | res_inode = NULL; | |
126 | if (!error) { | |
127 | if (type & CODA_NOCACHE) { | |
128 | type &= (~CODA_NOCACHE); | |
129 | dropme = 1; | |
130 | } | |
131 | ||
132 | error = coda_cnode_make(&res_inode, &resfid, dir->i_sb); | |
133 | if (error) { | |
134 | unlock_kernel(); | |
135 | return ERR_PTR(error); | |
136 | } | |
137 | } else if (error != -ENOENT) { | |
138 | unlock_kernel(); | |
139 | return ERR_PTR(error); | |
140 | } | |
141 | ||
142 | exit: | |
143 | entry->d_time = 0; | |
144 | entry->d_op = &coda_dentry_operations; | |
145 | d_add(entry, res_inode); | |
146 | if ( dropme ) { | |
147 | d_drop(entry); | |
148 | coda_flag_inode(res_inode, C_VATTR); | |
149 | } | |
150 | unlock_kernel(); | |
151 | return NULL; | |
152 | } | |
153 | ||
154 | ||
155 | int coda_permission(struct inode *inode, int mask, struct nameidata *nd) | |
156 | { | |
157 | int error = 0; | |
158 | ||
159 | if (!mask) | |
160 | return 0; | |
161 | ||
162 | lock_kernel(); | |
163 | ||
164 | coda_vfs_stat.permission++; | |
165 | ||
166 | if (coda_cache_check(inode, mask)) | |
167 | goto out; | |
168 | ||
169 | error = venus_access(inode->i_sb, coda_i2f(inode), mask); | |
170 | ||
171 | if (!error) | |
172 | coda_cache_enter(inode, mask); | |
173 | ||
174 | out: | |
175 | unlock_kernel(); | |
d728900c | 176 | return error; |
1da177e4 LT |
177 | } |
178 | ||
179 | ||
d728900c | 180 | static inline void coda_dir_update_mtime(struct inode *dir) |
1da177e4 LT |
181 | { |
182 | #ifdef REQUERY_VENUS_FOR_MTIME | |
183 | /* invalidate the directory cnode's attributes so we refetch the | |
184 | * attributes from venus next time the inode is referenced */ | |
185 | coda_flag_inode(dir, C_VATTR); | |
186 | #else | |
187 | /* optimistically we can also act as if our nose bleeds. The | |
d728900c JH |
188 | * granularity of the mtime is coarse anyways so we might actually be |
189 | * right most of the time. Note: we only do this for directories. */ | |
1da177e4 LT |
190 | dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC; |
191 | #endif | |
d728900c JH |
192 | } |
193 | ||
194 | /* we have to wrap inc_nlink/drop_nlink because sometimes userspace uses a | |
195 | * trick to fool GNU find's optimizations. If we can't be sure of the link | |
196 | * (because of volume mount points) we set i_nlink to 1 which forces find | |
197 | * to consider every child as a possible directory. We should also never | |
198 | * see an increment or decrement for deleted directories where i_nlink == 0 */ | |
199 | static inline void coda_dir_inc_nlink(struct inode *dir) | |
200 | { | |
201 | if (dir->i_nlink >= 2) | |
202 | inc_nlink(dir); | |
203 | } | |
204 | ||
205 | static inline void coda_dir_drop_nlink(struct inode *dir) | |
206 | { | |
207 | if (dir->i_nlink > 2) | |
208 | drop_nlink(dir); | |
1da177e4 LT |
209 | } |
210 | ||
211 | /* creation routines: create, mknod, mkdir, link, symlink */ | |
212 | static int coda_create(struct inode *dir, struct dentry *de, int mode, struct nameidata *nd) | |
213 | { | |
214 | int error=0; | |
215 | const char *name=de->d_name.name; | |
216 | int length=de->d_name.len; | |
217 | struct inode *inode; | |
218 | struct CodaFid newfid; | |
219 | struct coda_vattr attrs; | |
220 | ||
221 | lock_kernel(); | |
222 | coda_vfs_stat.create++; | |
223 | ||
224 | if (coda_isroot(dir) && coda_iscontrol(name, length)) { | |
225 | unlock_kernel(); | |
226 | return -EPERM; | |
227 | } | |
228 | ||
229 | error = venus_create(dir->i_sb, coda_i2f(dir), name, length, | |
230 | 0, mode, &newfid, &attrs); | |
231 | ||
232 | if ( error ) { | |
233 | unlock_kernel(); | |
234 | d_drop(de); | |
235 | return error; | |
236 | } | |
237 | ||
238 | inode = coda_iget(dir->i_sb, &newfid, &attrs); | |
239 | if ( IS_ERR(inode) ) { | |
240 | unlock_kernel(); | |
241 | d_drop(de); | |
242 | return PTR_ERR(inode); | |
243 | } | |
244 | ||
245 | /* invalidate the directory cnode's attributes */ | |
d728900c | 246 | coda_dir_update_mtime(dir); |
1da177e4 LT |
247 | unlock_kernel(); |
248 | d_instantiate(de, inode); | |
d728900c | 249 | return 0; |
1da177e4 LT |
250 | } |
251 | ||
252 | static int coda_mkdir(struct inode *dir, struct dentry *de, int mode) | |
253 | { | |
254 | struct inode *inode; | |
255 | struct coda_vattr attrs; | |
256 | const char *name = de->d_name.name; | |
257 | int len = de->d_name.len; | |
258 | int error; | |
259 | struct CodaFid newfid; | |
260 | ||
261 | lock_kernel(); | |
262 | coda_vfs_stat.mkdir++; | |
263 | ||
264 | if (coda_isroot(dir) && coda_iscontrol(name, len)) { | |
265 | unlock_kernel(); | |
266 | return -EPERM; | |
267 | } | |
268 | ||
269 | attrs.va_mode = mode; | |
270 | error = venus_mkdir(dir->i_sb, coda_i2f(dir), | |
271 | name, len, &newfid, &attrs); | |
272 | ||
273 | if ( error ) { | |
274 | unlock_kernel(); | |
275 | d_drop(de); | |
276 | return error; | |
277 | } | |
278 | ||
279 | inode = coda_iget(dir->i_sb, &newfid, &attrs); | |
280 | if ( IS_ERR(inode) ) { | |
281 | unlock_kernel(); | |
282 | d_drop(de); | |
283 | return PTR_ERR(inode); | |
284 | } | |
d728900c | 285 | |
1da177e4 | 286 | /* invalidate the directory cnode's attributes */ |
d728900c JH |
287 | coda_dir_inc_nlink(dir); |
288 | coda_dir_update_mtime(dir); | |
1da177e4 LT |
289 | unlock_kernel(); |
290 | d_instantiate(de, inode); | |
d728900c | 291 | return 0; |
1da177e4 LT |
292 | } |
293 | ||
294 | /* try to make de an entry in dir_inodde linked to source_de */ | |
295 | static int coda_link(struct dentry *source_de, struct inode *dir_inode, | |
296 | struct dentry *de) | |
297 | { | |
298 | struct inode *inode = source_de->d_inode; | |
299 | const char * name = de->d_name.name; | |
300 | int len = de->d_name.len; | |
301 | int error; | |
302 | ||
303 | lock_kernel(); | |
304 | coda_vfs_stat.link++; | |
305 | ||
306 | if (coda_isroot(dir_inode) && coda_iscontrol(name, len)) { | |
307 | unlock_kernel(); | |
308 | return -EPERM; | |
309 | } | |
310 | ||
311 | error = venus_link(dir_inode->i_sb, coda_i2f(inode), | |
312 | coda_i2f(dir_inode), (const char *)name, len); | |
313 | ||
d728900c | 314 | if (error) { |
1da177e4 LT |
315 | d_drop(de); |
316 | goto out; | |
317 | } | |
318 | ||
d728900c | 319 | coda_dir_update_mtime(dir_inode); |
1da177e4 LT |
320 | atomic_inc(&inode->i_count); |
321 | d_instantiate(de, inode); | |
d8c76e6f | 322 | inc_nlink(inode); |
d728900c | 323 | |
1da177e4 LT |
324 | out: |
325 | unlock_kernel(); | |
326 | return(error); | |
327 | } | |
328 | ||
329 | ||
330 | static int coda_symlink(struct inode *dir_inode, struct dentry *de, | |
331 | const char *symname) | |
332 | { | |
333 | const char *name = de->d_name.name; | |
334 | int len = de->d_name.len; | |
335 | int symlen; | |
336 | int error=0; | |
337 | ||
338 | lock_kernel(); | |
339 | coda_vfs_stat.symlink++; | |
340 | ||
341 | if (coda_isroot(dir_inode) && coda_iscontrol(name, len)) { | |
342 | unlock_kernel(); | |
343 | return -EPERM; | |
344 | } | |
345 | ||
346 | symlen = strlen(symname); | |
347 | if ( symlen > CODA_MAXPATHLEN ) { | |
348 | unlock_kernel(); | |
349 | return -ENAMETOOLONG; | |
350 | } | |
351 | ||
352 | /* | |
353 | * This entry is now negative. Since we do not create | |
d728900c | 354 | * an inode for the entry we have to drop it. |
1da177e4 LT |
355 | */ |
356 | d_drop(de); | |
d728900c | 357 | error = venus_symlink(dir_inode->i_sb, coda_i2f(dir_inode), name, len, |
1da177e4 LT |
358 | symname, symlen); |
359 | ||
360 | /* mtime is no good anymore */ | |
361 | if ( !error ) | |
d728900c | 362 | coda_dir_update_mtime(dir_inode); |
1da177e4 LT |
363 | |
364 | unlock_kernel(); | |
d728900c | 365 | return error; |
1da177e4 LT |
366 | } |
367 | ||
368 | /* destruction routines: unlink, rmdir */ | |
369 | int coda_unlink(struct inode *dir, struct dentry *de) | |
370 | { | |
371 | int error; | |
372 | const char *name = de->d_name.name; | |
373 | int len = de->d_name.len; | |
374 | ||
375 | lock_kernel(); | |
376 | coda_vfs_stat.unlink++; | |
377 | ||
d728900c JH |
378 | error = venus_remove(dir->i_sb, coda_i2f(dir), name, len); |
379 | if ( error ) { | |
1da177e4 | 380 | unlock_kernel(); |
d728900c JH |
381 | return error; |
382 | } | |
1da177e4 | 383 | |
d728900c | 384 | coda_dir_update_mtime(dir); |
9a53c3a7 | 385 | drop_nlink(de->d_inode); |
1da177e4 | 386 | unlock_kernel(); |
d728900c | 387 | return 0; |
1da177e4 LT |
388 | } |
389 | ||
390 | int coda_rmdir(struct inode *dir, struct dentry *de) | |
391 | { | |
392 | const char *name = de->d_name.name; | |
393 | int len = de->d_name.len; | |
8c6d2152 | 394 | int error; |
1da177e4 LT |
395 | |
396 | lock_kernel(); | |
397 | coda_vfs_stat.rmdir++; | |
398 | ||
1da177e4 | 399 | error = venus_rmdir(dir->i_sb, coda_i2f(dir), name, len); |
8c6d2152 JH |
400 | if (!error) { |
401 | /* VFS may delete the child */ | |
402 | if (de->d_inode) | |
403 | de->d_inode->i_nlink = 0; | |
1da177e4 | 404 | |
8c6d2152 JH |
405 | /* fix the link count of the parent */ |
406 | coda_dir_drop_nlink(dir); | |
407 | coda_dir_update_mtime(dir); | |
d728900c | 408 | } |
1da177e4 | 409 | unlock_kernel(); |
8c6d2152 | 410 | return error; |
1da177e4 LT |
411 | } |
412 | ||
413 | /* rename */ | |
d728900c | 414 | static int coda_rename(struct inode *old_dir, struct dentry *old_dentry, |
1da177e4 LT |
415 | struct inode *new_dir, struct dentry *new_dentry) |
416 | { | |
d728900c JH |
417 | const char *old_name = old_dentry->d_name.name; |
418 | const char *new_name = new_dentry->d_name.name; | |
1da177e4 LT |
419 | int old_length = old_dentry->d_name.len; |
420 | int new_length = new_dentry->d_name.len; | |
d728900c | 421 | int error; |
1da177e4 LT |
422 | |
423 | lock_kernel(); | |
424 | coda_vfs_stat.rename++; | |
425 | ||
d728900c JH |
426 | error = venus_rename(old_dir->i_sb, coda_i2f(old_dir), |
427 | coda_i2f(new_dir), old_length, new_length, | |
1da177e4 LT |
428 | (const char *) old_name, (const char *)new_name); |
429 | ||
d728900c | 430 | if ( !error ) { |
1da177e4 | 431 | if ( new_dentry->d_inode ) { |
d728900c JH |
432 | if ( S_ISDIR(new_dentry->d_inode->i_mode) ) { |
433 | coda_dir_drop_nlink(old_dir); | |
434 | coda_dir_inc_nlink(new_dir); | |
435 | } | |
436 | coda_dir_update_mtime(old_dir); | |
437 | coda_dir_update_mtime(new_dir); | |
1da177e4 LT |
438 | coda_flag_inode(new_dentry->d_inode, C_VATTR); |
439 | } else { | |
440 | coda_flag_inode(old_dir, C_VATTR); | |
441 | coda_flag_inode(new_dir, C_VATTR); | |
d728900c | 442 | } |
1da177e4 LT |
443 | } |
444 | unlock_kernel(); | |
445 | ||
446 | return error; | |
447 | } | |
448 | ||
449 | ||
450 | /* file operations for directories */ | |
451 | int coda_readdir(struct file *coda_file, void *dirent, filldir_t filldir) | |
452 | { | |
d4176d32 | 453 | struct dentry *coda_dentry = coda_file->f_path.dentry; |
1da177e4 LT |
454 | struct coda_file_info *cfi; |
455 | struct file *host_file; | |
456 | struct inode *host_inode; | |
457 | int ret; | |
458 | ||
459 | cfi = CODA_FTOC(coda_file); | |
460 | BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC); | |
461 | host_file = cfi->cfi_container; | |
462 | ||
463 | coda_vfs_stat.readdir++; | |
464 | ||
d4176d32 | 465 | host_inode = host_file->f_path.dentry->d_inode; |
1b1dcc1b | 466 | mutex_lock(&host_inode->i_mutex); |
1da177e4 LT |
467 | host_file->f_pos = coda_file->f_pos; |
468 | ||
469 | if (!host_file->f_op->readdir) { | |
470 | /* Venus: we must read Venus dirents from the file */ | |
471 | ret = coda_venus_readdir(host_file, filldir, dirent, coda_dentry); | |
472 | } else { | |
473 | /* potemkin case: we were handed a directory inode. */ | |
474 | /* Yuk, we can't call vfs_readdir because we are already | |
475 | * holding the inode semaphore. */ | |
476 | ret = -ENOTDIR; | |
477 | if (!host_file->f_op || !host_file->f_op->readdir) | |
478 | goto out; | |
479 | ||
480 | ret = -ENOENT; | |
481 | if (!IS_DEADDIR(host_inode)) { | |
7c9e3c2e | 482 | ret = host_file->f_op->readdir(host_file, dirent, filldir); |
1da177e4 LT |
483 | file_accessed(host_file); |
484 | } | |
485 | } | |
486 | out: | |
487 | coda_file->f_pos = host_file->f_pos; | |
1b1dcc1b | 488 | mutex_unlock(&host_inode->i_mutex); |
1da177e4 LT |
489 | |
490 | return ret; | |
491 | } | |
492 | ||
493 | static inline unsigned int CDT2DT(unsigned char cdt) | |
494 | { | |
495 | unsigned int dt; | |
496 | ||
497 | switch(cdt) { | |
498 | case CDT_UNKNOWN: dt = DT_UNKNOWN; break; | |
499 | case CDT_FIFO: dt = DT_FIFO; break; | |
500 | case CDT_CHR: dt = DT_CHR; break; | |
501 | case CDT_DIR: dt = DT_DIR; break; | |
502 | case CDT_BLK: dt = DT_BLK; break; | |
503 | case CDT_REG: dt = DT_REG; break; | |
504 | case CDT_LNK: dt = DT_LNK; break; | |
505 | case CDT_SOCK: dt = DT_SOCK; break; | |
506 | case CDT_WHT: dt = DT_WHT; break; | |
507 | default: dt = DT_UNKNOWN; break; | |
508 | } | |
509 | return dt; | |
510 | } | |
511 | ||
512 | /* support routines */ | |
513 | static int coda_venus_readdir(struct file *filp, filldir_t filldir, | |
514 | void *dirent, struct dentry *dir) | |
515 | { | |
516 | int result = 0; /* # of entries returned */ | |
517 | struct venus_dirent *vdir; | |
518 | unsigned long vdir_size = | |
519 | (unsigned long)(&((struct venus_dirent *)0)->d_name); | |
520 | unsigned int type; | |
521 | struct qstr name; | |
522 | ino_t ino; | |
523 | int ret, i; | |
524 | ||
f52720ca | 525 | vdir = kmalloc(sizeof(*vdir), GFP_KERNEL); |
1da177e4 LT |
526 | if (!vdir) return -ENOMEM; |
527 | ||
528 | i = filp->f_pos; | |
529 | switch(i) { | |
530 | case 0: | |
531 | ret = filldir(dirent, ".", 1, 0, dir->d_inode->i_ino, DT_DIR); | |
532 | if (ret < 0) break; | |
533 | result++; | |
534 | filp->f_pos++; | |
535 | /* fallthrough */ | |
536 | case 1: | |
537 | ret = filldir(dirent, "..", 2, 1, dir->d_parent->d_inode->i_ino, DT_DIR); | |
538 | if (ret < 0) break; | |
539 | result++; | |
540 | filp->f_pos++; | |
541 | /* fallthrough */ | |
542 | default: | |
543 | while (1) { | |
544 | /* read entries from the directory file */ | |
545 | ret = kernel_read(filp, filp->f_pos - 2, (char *)vdir, | |
546 | sizeof(*vdir)); | |
547 | if (ret < 0) { | |
548 | printk("coda_venus_readdir: read dir failed %d\n", ret); | |
549 | break; | |
550 | } | |
551 | if (ret == 0) break; /* end of directory file reached */ | |
552 | ||
553 | /* catch truncated reads */ | |
554 | if (ret < vdir_size || ret < vdir_size + vdir->d_namlen) { | |
555 | printk("coda_venus_readdir: short read: %ld\n", | |
d4176d32 | 556 | filp->f_path.dentry->d_inode->i_ino); |
1da177e4 LT |
557 | ret = -EBADF; |
558 | break; | |
559 | } | |
560 | /* validate whether the directory file actually makes sense */ | |
561 | if (vdir->d_reclen < vdir_size + vdir->d_namlen) { | |
562 | printk("coda_venus_readdir: Invalid dir: %ld\n", | |
d4176d32 | 563 | filp->f_path.dentry->d_inode->i_ino); |
1da177e4 LT |
564 | ret = -EBADF; |
565 | break; | |
566 | } | |
567 | ||
568 | name.len = vdir->d_namlen; | |
569 | name.name = vdir->d_name; | |
570 | ||
571 | /* Make sure we skip '.' and '..', we already got those */ | |
572 | if (name.name[0] == '.' && (name.len == 1 || | |
573 | (vdir->d_name[1] == '.' && name.len == 2))) | |
574 | vdir->d_fileno = name.len = 0; | |
575 | ||
576 | /* skip null entries */ | |
577 | if (vdir->d_fileno && name.len) { | |
578 | /* try to look up this entry in the dcache, that way | |
579 | * userspace doesn't have to worry about breaking | |
580 | * getcwd by having mismatched inode numbers for | |
581 | * internal volume mountpoints. */ | |
582 | ino = find_inode_number(dir, &name); | |
583 | if (!ino) ino = vdir->d_fileno; | |
584 | ||
585 | type = CDT2DT(vdir->d_type); | |
586 | ret = filldir(dirent, name.name, name.len, filp->f_pos, | |
587 | ino, type); | |
588 | /* failure means no space for filling in this round */ | |
589 | if (ret < 0) break; | |
590 | result++; | |
591 | } | |
592 | /* we'll always have progress because d_reclen is unsigned and | |
593 | * we've already established it is non-zero. */ | |
594 | filp->f_pos += vdir->d_reclen; | |
595 | } | |
596 | } | |
597 | kfree(vdir); | |
598 | return result ? result : ret; | |
599 | } | |
600 | ||
601 | /* called when a cache lookup succeeds */ | |
602 | static int coda_dentry_revalidate(struct dentry *de, struct nameidata *nd) | |
603 | { | |
604 | struct inode *inode = de->d_inode; | |
605 | struct coda_inode_info *cii; | |
606 | ||
607 | if (!inode) | |
608 | return 1; | |
609 | lock_kernel(); | |
610 | if (coda_isroot(inode)) | |
611 | goto out; | |
612 | if (is_bad_inode(inode)) | |
613 | goto bad; | |
614 | ||
615 | cii = ITOC(de->d_inode); | |
616 | if (!(cii->c_flags & (C_PURGE | C_FLUSH))) | |
617 | goto out; | |
618 | ||
619 | shrink_dcache_parent(de); | |
620 | ||
621 | /* propagate for a flush */ | |
622 | if (cii->c_flags & C_FLUSH) | |
623 | coda_flag_inode_children(inode, C_FLUSH); | |
624 | ||
625 | if (atomic_read(&de->d_count) > 1) | |
626 | /* pretend it's valid, but don't change the flags */ | |
627 | goto out; | |
628 | ||
629 | /* clear the flags. */ | |
630 | cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH); | |
631 | ||
632 | bad: | |
633 | unlock_kernel(); | |
634 | return 0; | |
635 | out: | |
636 | unlock_kernel(); | |
637 | return 1; | |
638 | } | |
639 | ||
640 | /* | |
641 | * This is the callback from dput() when d_count is going to 0. | |
642 | * We use this to unhash dentries with bad inodes. | |
643 | */ | |
644 | static int coda_dentry_delete(struct dentry * dentry) | |
645 | { | |
646 | int flags; | |
647 | ||
648 | if (!dentry->d_inode) | |
649 | return 0; | |
650 | ||
651 | flags = (ITOC(dentry->d_inode)->c_flags) & C_PURGE; | |
652 | if (is_bad_inode(dentry->d_inode) || flags) { | |
653 | return 1; | |
654 | } | |
655 | return 0; | |
656 | } | |
657 | ||
658 | ||
659 | ||
660 | /* | |
661 | * This is called when we want to check if the inode has | |
662 | * changed on the server. Coda makes this easy since the | |
663 | * cache manager Venus issues a downcall to the kernel when this | |
664 | * happens | |
665 | */ | |
666 | int coda_revalidate_inode(struct dentry *dentry) | |
667 | { | |
668 | struct coda_vattr attr; | |
669 | int error = 0; | |
670 | int old_mode; | |
671 | ino_t old_ino; | |
672 | struct inode *inode = dentry->d_inode; | |
673 | struct coda_inode_info *cii = ITOC(inode); | |
674 | ||
675 | lock_kernel(); | |
676 | if ( !cii->c_flags ) | |
677 | goto ok; | |
678 | ||
679 | if (cii->c_flags & (C_VATTR | C_PURGE | C_FLUSH)) { | |
680 | error = venus_getattr(inode->i_sb, &(cii->c_fid), &attr); | |
681 | if ( error ) | |
682 | goto return_bad; | |
683 | ||
684 | /* this inode may be lost if: | |
685 | - it's ino changed | |
686 | - type changes must be permitted for repair and | |
687 | missing mount points. | |
688 | */ | |
689 | old_mode = inode->i_mode; | |
690 | old_ino = inode->i_ino; | |
691 | coda_vattr_to_iattr(inode, &attr); | |
692 | ||
693 | if ((old_mode & S_IFMT) != (inode->i_mode & S_IFMT)) { | |
694 | printk("Coda: inode %ld, fid %s changed type!\n", | |
695 | inode->i_ino, coda_f2s(&(cii->c_fid))); | |
696 | } | |
697 | ||
698 | /* the following can happen when a local fid is replaced | |
699 | with a global one, here we lose and declare the inode bad */ | |
700 | if (inode->i_ino != old_ino) | |
701 | goto return_bad; | |
702 | ||
703 | coda_flag_inode_children(inode, C_FLUSH); | |
704 | cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH); | |
705 | } | |
706 | ||
707 | ok: | |
708 | unlock_kernel(); | |
709 | return 0; | |
710 | ||
711 | return_bad: | |
712 | unlock_kernel(); | |
713 | return -EIO; | |
714 | } |