prepare for the transition to linux 2.6.22 - make it possible to override the kernel...
[openwrt/openwrt.git] / target / linux / generic-2.6 / patches-2.6.22 / 209-mini_fo.patch
1 diff -urN linux-2.6.21.1.old/fs/Kconfig linux-2.6.21.1.dev/fs/Kconfig
2 --- linux-2.6.21.1.old/fs/Kconfig 2007-05-26 19:03:45.497714200 +0200
3 +++ linux-2.6.21.1.dev/fs/Kconfig 2007-05-26 21:01:26.154331240 +0200
4 @@ -461,6 +461,9 @@
5 This option will enlarge your kernel, but it allows debugging of
6 ocfs2 filesystem issues.
7
8 +config MINI_FO
9 + tristate "Mini fanout overlay filesystem"
10 +
11 config MINIX_FS
12 tristate "Minix fs support"
13 help
14 diff -urN linux-2.6.21.1.old/fs/Makefile linux-2.6.21.1.dev/fs/Makefile
15 --- linux-2.6.21.1.old/fs/Makefile 2007-05-26 19:03:45.497714200 +0200
16 +++ linux-2.6.21.1.dev/fs/Makefile 2007-05-26 21:01:26.160330328 +0200
17 @@ -76,6 +76,7 @@
18 obj-$(CONFIG_RAMFS) += ramfs/
19 obj-$(CONFIG_HUGETLBFS) += hugetlbfs/
20 obj-$(CONFIG_CODA_FS) += coda/
21 +obj-$(CONFIG_MINI_FO) += mini_fo/
22 obj-$(CONFIG_MINIX_FS) += minix/
23 obj-$(CONFIG_FAT_FS) += fat/
24 obj-$(CONFIG_MSDOS_FS) += msdos/
25 diff -urN linux-2.6.21.1.old/fs/mini_fo/aux.c linux-2.6.21.1.dev/fs/mini_fo/aux.c
26 --- linux-2.6.21.1.old/fs/mini_fo/aux.c 1970-01-01 01:00:00.000000000 +0100
27 +++ linux-2.6.21.1.dev/fs/mini_fo/aux.c 2007-05-26 21:01:26.160330328 +0200
28 @@ -0,0 +1,580 @@
29 +/*
30 + * Copyright (c) 1997-2003 Erez Zadok
31 + * Copyright (c) 2001-2003 Stony Brook University
32 + *
33 + * For specific licensing information, see the COPYING file distributed with
34 + * this package, or get one from ftp://ftp.filesystems.org/pub/fist/COPYING.
35 + *
36 + * This Copyright notice must be kept intact and distributed with all
37 + * fistgen sources INCLUDING sources generated by fistgen.
38 + */
39 +/*
40 + * Copyright (C) 2004, 2005 Markus Klotzbuecher <mk@creamnet.de>
41 + *
42 + * This program is free software; you can redistribute it and/or
43 + * modify it under the terms of the GNU General Public License
44 + * as published by the Free Software Foundation; either version
45 + * 2 of the License, or (at your option) any later version.
46 + */
47 +/*
48 + * $Id$
49 + */
50 +
51 +#ifdef HAVE_CONFIG_H
52 +# include <config.h>
53 +#endif
54 +
55 +#include "fist.h"
56 +#include "mini_fo.h"
57 +
58 +/* check if file exists in storage */
59 +int exists_in_storage(dentry_t *dentry)
60 +{
61 + check_mini_fo_dentry(dentry);
62 + if(dtost(dentry) == MODIFIED || dtost(dentry) == CREATED || dtost(dentry) == DEL_REWRITTEN)
63 + return 1;
64 + return 0;
65 +}
66 +
67 +/* check if dentry is in an existing state */
68 +int is_mini_fo_existant(dentry_t *dentry)
69 +{
70 + check_mini_fo_dentry(dentry);
71 +
72 + if(dtost(dentry) == DELETED || dtost(dentry) == NON_EXISTANT)
73 + return 0;
74 + else
75 + return 1;
76 +}
77 +
78 +/*
79 + * This function will create a negative storage dentry for
80 + * dentry, what is required for many create like options.
81 + * It will create the storage structure if necessary.
82 + */
83 +int get_neg_sto_dentry(dentry_t *dentry)
84 +{
85 + int err = 0;
86 + unsigned int len;
87 + const unsigned char *name;
88 +
89 + if(!dentry ||
90 + !dtopd(dentry) ||
91 + !(dtost(dentry) == UNMODIFIED ||
92 + dtost(dentry) == NON_EXISTANT ||
93 + dtost(dentry) == DELETED)) {
94 + printk(KERN_CRIT "mini_fo: get_neg_sto_dentry: invalid dentry passed.\n");
95 + err = -1;
96 + goto out;
97 + }
98 + /* Have we got a neg. dentry already? */
99 + if(dtohd2(dentry)) {
100 + err = 0;
101 + goto out;
102 + }
103 + if(dtost(dentry->d_parent) == UNMODIFIED) {
104 + /* build sto struct */
105 + err = build_sto_structure(dentry->d_parent->d_parent, dentry->d_parent);
106 + if(err ||
107 + dtost(dentry->d_parent) != MODIFIED) {
108 + printk(KERN_CRIT "mini_fo: get_neg_sto_dentry: ERROR building sto structure.\n");
109 + err = -1;
110 + goto out;
111 + }
112 + }
113 +
114 + len = dentry->d_name.len;
115 + name = dentry->d_name.name;
116 +
117 + dtohd2(dentry) =
118 + lookup_one_len(name, dtohd2(dentry->d_parent), len);
119 +
120 + out:
121 + return err;
122 +}
123 +
124 +int check_mini_fo_dentry(dentry_t *dentry)
125 +{
126 + ASSERT(dentry != NULL);
127 + ASSERT(dtopd(dentry) != NULL);
128 + ASSERT((dtohd(dentry) != NULL) || (dtohd2(dentry) != NULL));
129 +
130 +/* if(dtost(dentry) == MODIFIED) { */
131 +/* ASSERT(dentry->d_inode != NULL); */
132 +/* ASSERT(dtohd(dentry) != NULL); */
133 +/* ASSERT(dtohd(dentry)->d_inode != NULL); */
134 +/* ASSERT(dtohd2(dentry) != NULL); */
135 +/* ASSERT(dtohd2(dentry)->d_inode != NULL); */
136 +/* } */
137 +/* else if(dtost(dentry) == UNMODIFIED) { */
138 +/* ASSERT(dentry->d_inode != NULL); */
139 +/* ASSERT( */
140 +/* } */
141 + return 0;
142 +}
143 +
144 +int check_mini_fo_file(file_t *file)
145 +{
146 + ASSERT(file != NULL);
147 + ASSERT(ftopd(file) != NULL);
148 + ASSERT(file->f_dentry != NULL);
149 +
150 + /* violent checking, check depending of state and type
151 + * if(S_ISDIR(file->f_dentry->d_inode->i_mode)) {}
152 + */
153 + ASSERT((ftohf(file) != NULL) || (ftohf2(file) != NULL));
154 + return 0;
155 +}
156 +
157 +int check_mini_fo_inode(inode_t *inode)
158 +{
159 + ASSERT(inode != NULL);
160 + ASSERT(itopd(inode) != NULL);
161 + ASSERT((itohi(inode) != NULL) || (itohi2(inode) != NULL));
162 + return 0;
163 +}
164 +
165 +/*
166 + * will walk a base path as provided by get_mini_fo_bpath and return
167 + * the (hopefully ;-) ) positive dentry of the renamed base dir.
168 + *
169 + * This does some work of path_init.
170 + */
171 +dentry_t *bpath_walk(super_block_t *sb, char *bpath)
172 +{
173 + int err;
174 + struct nameidata nd;
175 +
176 + /* be paranoid */
177 + if(!bpath || bpath[0] != '/') {
178 + printk(KERN_CRIT "mini_fo: bpath_walk: Invalid string.\n");
179 + return NULL;
180 + }
181 + if(!sb || !stopd(sb)) {
182 + printk(KERN_CRIT "mini_fo: bpath_walk: Invalid sb.\n");
183 + return NULL;
184 + }
185 +
186 + /* setup nd as path_init does */
187 + nd.last_type = LAST_ROOT; /* if there are only slashes... */
188 + nd.flags = LOOKUP_FOLLOW;
189 + /* fix this: how do I reach this lock?
190 + * read_lock(&current->fs->lock); */
191 + nd.mnt = mntget(stopd(sb)->hidden_mnt);
192 + nd.dentry = dget(stopd(sb)->base_dir_dentry);
193 + /* read_unlock(&current->fs->lock); */
194 +
195 + err = path_walk(bpath+1, &nd);
196 +
197 + /* validate */
198 + if (err || !nd.dentry || !nd.dentry->d_inode) {
199 + printk(KERN_CRIT "mini_fo: bpath_walk: path_walk failed.\n");
200 + return NULL;
201 + }
202 + return nd.dentry;
203 +}
204 +
205 +
206 +/* returns the full path of the basefile incl. its name */
207 +int get_mini_fo_bpath(dentry_t *dentry, char **bpath, int *bpath_len)
208 +{
209 + char *buf_walker;
210 + int len = 0;
211 + dentry_t *sky_walker;
212 +
213 + if(!dentry || !dtohd(dentry)) {
214 + printk(KERN_CRIT "mini_fo: get_mini_fo_bpath: invalid dentry passed.\n");
215 + return -1;
216 + }
217 + sky_walker = dtohd(dentry);
218 +
219 + do {
220 + len += sky_walker->d_name.len + 1 ; /* 1 for '/' */
221 + sky_walker = sky_walker->d_parent;
222 + } while(sky_walker != stopd(dentry->d_inode->i_sb)->base_dir_dentry);
223 +
224 + /* 1 to oil the loop */
225 + *bpath = (char*) kmalloc(len + 1, GFP_KERNEL);
226 + if(!*bpath) {
227 + printk(KERN_CRIT "mini_fo: get_mini_fo_bpath: out of mem.\n");
228 + return -1;
229 + }
230 + buf_walker = *bpath+len; /* put it on last char */
231 + *buf_walker = '\n';
232 + sky_walker = dtohd(dentry);
233 +
234 + do {
235 + buf_walker -= sky_walker->d_name.len;
236 + strncpy(buf_walker,
237 + sky_walker->d_name.name,
238 + sky_walker->d_name.len);
239 + *(--buf_walker) = '/';
240 + sky_walker = sky_walker->d_parent;
241 + } while(sky_walker != stopd(dentry->d_inode->i_sb)->base_dir_dentry);
242 +
243 + /* bpath_len doesn't count newline! */
244 + *bpath_len = len;
245 + return 0;
246 +}
247 +
248 +int mini_fo_cp_cont(dentry_t *tgt_dentry, struct vfsmount *tgt_mnt,
249 + dentry_t *src_dentry, struct vfsmount *src_mnt)
250 +{
251 + void *buf;
252 + mm_segment_t old_fs;
253 + file_t *tgt_file;
254 + file_t *src_file;
255 + int bytes, len, tmp, err;
256 + err = 0;
257 +
258 + if(!(tgt_dentry->d_inode && src_dentry->d_inode)) {
259 + printk(KERN_CRIT "mini_fo_cp_cont: ERROR, neg. dentry passed.\n");
260 + err = -EINVAL;
261 + goto out;
262 + }
263 +
264 + dget(tgt_dentry);
265 + dget(src_dentry);
266 + mntget(tgt_mnt);
267 + mntget(src_mnt);
268 +
269 + /* open file write only */
270 + tgt_file = dentry_open(tgt_dentry, tgt_mnt, 0x1);
271 + if(!tgt_file || IS_ERR(tgt_file)) {
272 + printk(KERN_CRIT "mini_fo_cp_cont: ERROR opening target file.\n");
273 + err = PTR_ERR(tgt_file);
274 + goto out_err;
275 + }
276 +
277 + /* open file read only */
278 + src_file = dentry_open(src_dentry, src_mnt, 0x0);
279 + if(!src_file || IS_ERR(src_file)) {
280 + printk(KERN_CRIT "mini_fo_cp_cont: ERROR opening source file.\n");
281 + err = PTR_ERR(src_file);
282 +
283 + /* close target file */
284 + fput(tgt_file);
285 + goto out_err;
286 + }
287 +
288 + /* check if the filesystem(s) support read respective write */
289 + if(!src_file->f_op->read || !tgt_file->f_op->write) {
290 + printk(KERN_CRIT "mini_fo_cp_cont: ERROR, no fs read or write support.\n");
291 + err = -EPERM;
292 + goto out_close;
293 + }
294 +
295 + /* allocate a page for transfering the data */
296 + buf = (void *) __get_free_page(GFP_KERNEL);
297 + if(!buf) {
298 + printk(KERN_CRIT "mini_fo_cp_cont: ERROR, out of kernel mem.\n");
299 + goto out_err;
300 + }
301 +
302 + tgt_file->f_pos = 0;
303 + src_file->f_pos = 0;
304 +
305 + old_fs = get_fs();
306 + set_fs(KERNEL_DS);
307 +
308 + /* Doing this I assume that a read operation will return a full
309 + * buffer while there is still data to read, and a less than
310 + * full buffer when all data has been read.
311 + */
312 + bytes = len = PAGE_SIZE;
313 + while(bytes == len) {
314 + bytes = src_file->f_op->read(src_file, buf, len,
315 + &src_file->f_pos);
316 + tmp = tgt_file->f_op->write(tgt_file, buf, bytes,
317 + &tgt_file->f_pos);
318 + if(tmp != bytes) {
319 + printk(KERN_CRIT "mini_fo_cp_cont: ERROR writing.\n");
320 + goto out_close_unset;
321 + }
322 + }
323 +
324 + free_page((unsigned long) buf);
325 + set_fs(old_fs);
326 + fput(tgt_file);
327 + fput(src_file);
328 + goto out;
329 +
330 + out_close_unset:
331 + free_page((unsigned long) buf);
332 + set_fs(old_fs);
333 +
334 + out_close:
335 + fput(tgt_file);
336 + fput(src_file);
337 +
338 + out_err:
339 + dput(tgt_dentry);
340 + dput(src_dentry);
341 +
342 + /* mk: not sure if this need to be done */
343 + mntput(tgt_mnt);
344 + mntput(src_mnt);
345 +
346 + out:
347 + return err;
348 +}
349 +
350 +/* mk:
351 + * ndl (no-duplicate list) stuff
352 + * This is used in mini_fo_readdir, to save the storage directory contents
353 + * and later when reading base, match them against the list in order
354 + * to avoid duplicates.
355 + */
356 +
357 +/* add a file specified by name and len to the ndl
358 + * Return values: 0 on success, <0 on failure.
359 + */
360 +int ndl_add_entry(struct readdir_data *rd, const char *name, int len)
361 +{
362 + struct ndl_entry *tmp_entry;
363 +
364 + tmp_entry = (struct ndl_entry *)
365 + kmalloc(sizeof(struct ndl_entry), GFP_KERNEL);
366 + if(!tmp_entry) {
367 + printk(KERN_CRIT "mini_fo: ndl_add_entry: out of mem.\n");
368 + return -ENOMEM;
369 + }
370 + tmp_entry->name = (char*) kmalloc(len, GFP_KERNEL);
371 + if(!tmp_entry->name) {
372 + printk(KERN_CRIT "mini_fo: ndl_add_entry: out of mem.\n");
373 + return -ENOMEM;
374 + }
375 + strncpy(tmp_entry->name, name, len);
376 + tmp_entry->len = len;
377 +
378 + list_add(&tmp_entry->list, &rd->ndl_list);
379 + rd->ndl_size++;
380 + return 0;
381 +}
382 +
383 +/* delete all list entries and free memory */
384 +void ndl_put_list(struct readdir_data *rd)
385 +{
386 + struct list_head *tmp;
387 + struct ndl_entry *tmp_entry;
388 +
389 + if(rd->ndl_size <= 0)
390 + return;
391 + while(!list_empty(&rd->ndl_list)) {
392 + tmp = rd->ndl_list.next;
393 + list_del(tmp);
394 + tmp_entry = list_entry(tmp, struct ndl_entry, list);
395 + kfree(tmp_entry->name);
396 + kfree(tmp_entry);
397 + }
398 + rd->ndl_size = 0;
399 +}
400 +
401 +/* Check if a file specified by name and len is in the ndl
402 + * Return value: 0 if not in list, 1 if file is found in ndl.
403 + */
404 +int ndl_check_entry(struct readdir_data *rd, const char *name, int len)
405 +{
406 + struct list_head *tmp;
407 + struct ndl_entry *tmp_entry;
408 +
409 + if(rd->ndl_size <= 0)
410 + return 0;
411 +
412 + list_for_each(tmp, &rd->ndl_list) {
413 + tmp_entry = list_entry(tmp, struct ndl_entry, list);
414 + if(tmp_entry->len != len)
415 + continue;
416 + if(!strncmp(tmp_entry->name, name, len))
417 + return 1;
418 + }
419 + return 0;
420 +}
421 +
422 +/* mk:
423 + * Recursive function to create corresponding directorys in the storage fs.
424 + * The function will build the storage directorys up to dentry.
425 + */
426 +int build_sto_structure(dentry_t *dir, dentry_t *dentry)
427 +{
428 + int err;
429 + dentry_t *hidden_sto_dentry;
430 + dentry_t *hidden_sto_dir_dentry;
431 +
432 + if(dentry->d_parent != dir) {
433 + printk(KERN_CRIT "mini_fo: build_sto_structure: invalid parameter or meta data corruption [1].\n");
434 + return 1;
435 + }
436 +
437 + if(dtost(dir) != MODIFIED) {
438 + err = build_sto_structure(dir->d_parent, dentry->d_parent);
439 + if(err)
440 + return err;
441 + }
442 +
443 + /* ok, coming back again. */
444 + check_mini_fo_dentry(dentry);
445 + hidden_sto_dentry = dtohd2(dentry);
446 +
447 + if(!hidden_sto_dentry) {
448 + /*
449 + * This is the case after creating the first
450 + * hidden_sto_dentry.
451 + * After one negative storage_dentry, all pointers to
452 + * hidden_storage dentries are set to NULL. We need to
453 + * create the negative dentry before we create the storage
454 + * file.
455 + */
456 + unsigned int len;
457 + const unsigned char *name;
458 + len = dtohd(dentry)->d_name.len;
459 + name = dtohd(dentry)->d_name.name;
460 + hidden_sto_dentry = lookup_one_len(name, dtohd2(dir), len);
461 + dtohd2(dentry) = hidden_sto_dentry;
462 + }
463 +
464 + /* was: hidden_sto_dir_dentry = lock_parent(hidden_sto_dentry); */
465 + hidden_sto_dir_dentry = dget(hidden_sto_dentry->d_parent);
466 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
467 + mutex_lock(&hidden_sto_dir_dentry->d_inode->i_mutex);
468 +#else
469 + down(&hidden_sto_dir_dentry->d_inode->i_sem);
470 +#endif
471 + /* lets be safe */
472 + if(dtohd2(dir) != hidden_sto_dir_dentry) {
473 + printk(KERN_CRIT "mini_fo: build_sto_structure: invalid parameter or meta data corruption [2].\n");
474 + return 1;
475 + }
476 +
477 + /* check for errors in lock_parent */
478 + err = PTR_ERR(hidden_sto_dir_dentry);
479 + if(IS_ERR(hidden_sto_dir_dentry)) {
480 + printk(KERN_CRIT "mini_fo: build_sto_structure: lock_parent failed.\n");
481 + return err;
482 + }
483 +
484 + err = vfs_mkdir(hidden_sto_dir_dentry->d_inode,
485 + hidden_sto_dentry,
486 + dir->d_inode->i_mode);
487 +
488 + if(err) {
489 + printk(KERN_CRIT "mini_fo: build_sto_structure: failed to create storage dir [1].\n");
490 + /* was: unlock_dir(dir); */
491 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
492 + mutex_unlock(&dir->d_inode->i_mutex);
493 +#else
494 + up(&dir->d_inode->i_sem);
495 +#endif
496 + dput(dir);
497 + return err;
498 + }
499 +
500 + /* everything ok! */
501 + if(!dtohd2(dentry)->d_inode) {
502 + printk(KERN_CRIT "mini_fo: build_sto_structure: failed to create storage dir [2].\n");
503 + /* was: unlock_dir(dir); */
504 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
505 + mutex_unlock(&dir->d_inode->i_mutex);
506 +#else
507 + up(&dir->d_inode->i_sem);
508 +#endif
509 + dput(dir);
510 + return 1;
511 + }
512 +
513 + /* interpose the new inode and set new state */
514 + itohi2(dentry->d_inode) = igrab(dtohd2(dentry)->d_inode);
515 + dtopd(dentry)->state = MODIFIED;
516 +
517 + /* initalize the wol list */
518 + itopd(dentry->d_inode)->deleted_list_size = -1;
519 + itopd(dentry->d_inode)->renamed_list_size = -1;
520 + meta_build_lists(dentry);
521 +
522 + fist_copy_attr_all(dentry->d_inode, itohi2(dentry->d_inode));
523 + fist_copy_attr_timesizes(dir->d_inode,
524 + hidden_sto_dir_dentry->d_inode);
525 + dir->d_inode->i_nlink++;
526 + /* was: unlock_dir(hidden_sto_dir_dentry); */
527 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
528 + mutex_unlock(&hidden_sto_dir_dentry->d_inode->i_mutex);
529 +#else
530 + up(&hidden_sto_dir_dentry->d_inode->i_sem);
531 +#endif
532 + dput(hidden_sto_dir_dentry);
533 + return 0;
534 +}
535 +
536 +
537 +#if 0 /* unused */
538 +
539 +/*
540 + * Read "len" bytes from "filename" into "buf".
541 + * "buf" is in kernel space.
542 + */
543 +int
544 +mini_fo_read_file(const char *filename, void *buf, int len)
545 +{
546 + file_t *filp;
547 + mm_segment_t oldfs;
548 + int bytes;
549 + /* Chroot? Maybe NULL isn't right here */
550 + filp = filp_open(filename, O_RDONLY, 0);
551 + if (!filp || IS_ERR(filp)) {
552 + printk("mini_fo_read_file err %d\n", (int) PTR_ERR(filp));
553 + return -1; /* or do something else */
554 + }
555 +
556 + if (!filp->f_op->read)
557 + return -2; /* file(system) doesn't allow reads */
558 +
559 + /* now read len bytes from offset 0 */
560 + filp->f_pos = 0; /* start offset */
561 + oldfs = get_fs();
562 + set_fs(KERNEL_DS);
563 + bytes = filp->f_op->read(filp, buf, len, &filp->f_pos);
564 + set_fs(oldfs);
565 +
566 + /* close the file */
567 + fput(filp);
568 +
569 + return bytes;
570 +}
571 +
572 +
573 +
574 +/*
575 + * Write "len" bytes from "buf" to "filename"
576 + * "buf" is in kernel space.
577 + */
578 +int
579 +mini_fo_write_file(const char *filename, void *buf, int len)
580 +{
581 + file_t *filp;
582 + mm_segment_t oldfs;
583 + int bytes;
584 + /* Chroot? Maybe NULL isn't right here */
585 + filp = filp_open(filename, O_RDWR|O_CREAT, 0640);
586 + if (!filp || IS_ERR(filp)) {
587 + printk("mini_fo_write_file err %d\n", (int) PTR_ERR(filp));
588 + return -1; /* or do something else */
589 + }
590 +
591 + if (!filp->f_op->write)
592 + return -2; /* file(system) doesn't allow writes */
593 +
594 + /* now write len bytes from offset 0 */
595 + filp->f_pos = 0; /* start offset */
596 + oldfs = get_fs();
597 + set_fs(KERNEL_DS);
598 + bytes = filp->f_op->write(filp, buf, len, &filp->f_pos);
599 + set_fs(oldfs);
600 +
601 + /* close the file */
602 + fput(filp);
603 +
604 + return bytes;
605 +}
606 +
607 +#endif /* unused */
608 +
609 diff -urN linux-2.6.21.1.old/fs/mini_fo/ChangeLog linux-2.6.21.1.dev/fs/mini_fo/ChangeLog
610 --- linux-2.6.21.1.old/fs/mini_fo/ChangeLog 1970-01-01 01:00:00.000000000 +0100
611 +++ linux-2.6.21.1.dev/fs/mini_fo/ChangeLog 2007-05-26 21:01:26.161330176 +0200
612 @@ -0,0 +1,281 @@
613 +2006-01-24 Markus Klotzbuecher <mk@mary.denx.de>
614 +
615 + * Add tons of ugly ifdefs to Ed L. Cashin's mutex patch to
616 + retain backwards compatibility.
617 +
618 +2006-01-24 Ed L. Cashin <ecashin@coraid.com>
619 +
620 + * Support for the new mutex infrastructure
621 + (7892f2f48d165a34b0b8130c8a195dfd807b8cb6)
622 +
623 +2005-10-15 Markus Klotzbuecher <mk@localhost.localdomain>
624 +
625 + * Bugfix for a serious memory leak in mini_fo_follow_link.
626 +
627 +2005-09-21 Markus Klotzbuecher <mk@mary>
628 +
629 + * new release 0.6.1
630 +
631 + * fix of a compiler warning due to changes in 2.6.13
632 +
633 +2005-09-21 Klaus Wenninger <klaus.wenninger@siemens.com>
634 +
635 + * file.c: readdir: fix for a bug that caused directory entries
636 + to show up twice when using storage filesystems such as
637 + minixfs or pramfs.
638 +
639 +2005-06-30 Eric Lammerts <eric@lammerts.org>
640 +
641 + * fix for an oops when overwriting a binary thats beeing
642 + executed.
643 +
644 +2005-06-09 <mk@mary>
645 +
646 + * Renamed overlay to mini_fo-overlay.
647 +
648 + * Added mini_fo-merge script to allow merging of storage and base
649 + after making modifications.
650 +
651 +2005-05-22 root <mk@mary>
652 +
653 + * Added overlay script that allows to easily mount mini_fo ontop
654 + of a given base directory
655 +
656 +2005-05-10 <mk@mary>
657 +
658 + * inode.c: xattr functions return -EOPNOSUPP instead of
659 + -ENOSUPP, what confuses "ls -l"
660 +
661 + * Changed license from LGPL to GPL.
662 +
663 +2005-05-08 root <mk@mary>
664 +
665 + * Makefile: clean it up and added make install and make
666 + uninstall.
667 +
668 +2005-05-06 <mk@mary>
669 +
670 + * merged devel branch back to main. [v0-6-0-pre3]
671 +
672 + * removed unused files print.c and fist_ioctl. [devel-0-0-18]
673 +
674 + * ioctl: removed fist_ioctl stuff, that is not needed for
675 + now.
676 +
677 +2005-05-03 <mk@mary>
678 +
679 + * file.c: simplified mini_fo_open and mini_fo_setattr using
680 + new state changing functions. [devel-0-0-17]
681 +
682 + * inode.c: Fixed getattr state bug (see below) in 2.4 function
683 + mini_fo_inode revalidate.
684 +
685 + * inode.c: found an other bug in mini_fo_getattr. States are not
686 + reliable in this function, as a file can be opened, unlinked and
687 + the getattr function called. This results in a deleted dentry
688 + with an inode. Fix is to ignore states and simply use the inode
689 + available.
690 +
691 +2005-04-29 <mk@mary>
692 +
693 + * file.c: Bugfix and cleanup in fasync and fsync. [devel-0-0-16]
694 +
695 + * file.c: do not use mini_fo_lock so the generic version is
696 + used (I guess).
697 +
698 + * inode.c: getattr, never call getattr on lower files, as this
699 + will cause the inum to change.
700 +
701 + * inode.c: rename_reg_file renamed to rename_nondir, as it
702 + doesn't matter as long it't not a dir. Removed all
703 + rename_dev_file etc.
704 +
705 + * tagged as devel-0-0-15
706 +
707 + * inode.c: added support for chosing support for extended
708 + attrs at compile time by XATTR define in mini_fo.h .
709 +
710 + * inode.c: fixed mini_fo_getattr to use mini_fo inode and not
711 + lower again, what avoids inode number changes that confused
712 + rm again. This is the proper solution.
713 +
714 +2005-04-24 <mk@mary>
715 +
716 + * all files: updated Copyright notive to 2005. [devel-0-0-14]
717 +
718 + * inode.c: fixed mini_fo_getattr to not change the inode
719 + number, even if lower files change.
720 +
721 + * super.c: fixed a bug that caused deleted base file to show
722 + up suddenly after some time, or after creating a special
723 + file. The problem was that after some time or after special
724 + file creating sync_sb_inodes is called by the vfs, that
725 + called our mini_fo_put_inode. There was (wrongly) called
726 + __meta_put_lists, that nuked the lists, although the inode
727 + was going to continue its life. Moving __meta_put_lists to
728 + mini_fo_clear_inode, where an inode is really destroyed,
729 + solved the problem.
730 +
731 +
732 +2005-04-23 <mk@mary>
733 +
734 + * state.c, aux.c: more cleaning up and
735 + simplifications. [devel-0-0-13]
736 +
737 + * inode.c: implemented mini_fo_getattr, that was required for
738 + 2.6 because inode_revalidate has been remove there, and the
739 + old "du" bug returned.
740 +
741 +
742 +2005-04-20 <mk@mary>
743 +
744 + * aux.c: get_neg_sto_dentry(): allow to be called for dentries
745 + in state UNMODIFIED, NON_EXISTANT _and_ DELETED.
746 +
747 +2005-04-19 <mk@mary>
748 +
749 + * Fixed a bug under 2.6 that caused files deleted via mini_fo
750 + not to be deleted properly and therefore the fs filled up
751 + untill no memory was left. [devel-0-0-12]
752 +
753 + * Added basic hard link support. This means that creating
754 + hardlinks will work, but existing ones will be treated as
755 + individual files. [devel-0-0-11]
756 +
757 +2005-04-17 <mk@mary>
758 +
759 + * Bugfixes
760 +
761 +2005-04-13 root <mk@mary>
762 +
763 + * Added file state.c for the state transition
764 + functions. Doesn't work very well yet, though...
765 +
766 +2005-04-12 <mk@mary>
767 +
768 + * Porting to 2.6 started, which is easier than expected, also
769 + due to Olivier previous work.
770 +
771 +2005-04-08 <mk@mary>
772 +
773 + * Fixed the bug that caused du to return invalid sizes of
774 + directory trees. The problem was that
775 + mini_fo_inode_revalidate didn't always copy the attributes
776 + from the base inode properly.
777 +
778 +2005-04-01 Markus Klotzbuecher <mk@chasey>
779 +
780 + * Merged devel branch back to main trunk and updated the
781 + RELEASE notes. This will be 0-6-0-pre1.
782 +
783 +2005-03-31 Markus Klotzbuecher <mk@chasey>
784 +
785 + * Fixed some bugs in rename_reg_file, that only showed up in
786 + the kernel compile test. Kernel compiles cleanly ontop of
787 + mini_fo, now also make mrproper etc. work. Seems pretty stable.
788 +
789 +2005-03-28 Markus Klotzbuecher <mk@chasey>
790 +
791 + * Many, many directory renaming bugfixes and a lot of other
792 + cleanup. Dir renaming seems to work relatively stable.
793 +
794 +2005-03-22 Markus Klotzbuecher <mk@chasey>
795 +
796 + * Finished implementing lightweight directory renaming. Some
797 + basic testing indicates it works fine.
798 + Next is to implement testcases for the testsuite and confirm
799 + everything is really working ok.
800 +
801 +2005-03-18 Markus Klotzbuecher <mk@chasey>
802 +
803 + * Finished implementing meta.c stuff required for directory
804 + renaming.
805 +
806 +2005-03-17 Markus Klotzbuecher <mk@chasey>
807 +
808 + * Fixed all compile warnings + an extremly old bug that
809 + somehow crept in while reworking the wol stuff to the META
810 + system. Turning on -Werror again... :-)
811 +
812 + * Fixed some bugs in the new rename_reg_file function.
813 +
814 + * Rewrote mini_fo rename and split it into several
815 + subfunctions, that handle the different types
816 + seperately. Rewrote the regular file function aswell, as it
817 + was implemented somewhat inefficient.
818 +
819 +2005-03-16 Markus Klotzbuecher <mk@chasey>
820 +
821 + * Implemented new META subsystem, removed old WOL stuff in favor
822 + if it.
823 +
824 + * After some basic testing everything seems ok...
825 +
826 +2005-03-11 Markus Klotzbuecher <mk@chasey>
827 +
828 + * Renaming a non regular file caused trouble because I always
829 + tried to copy the contents. Now I only do this for regular
830 + files. mini_fo_rename still isn't implemented properly, renaming
831 + of device files, symlinks etc. results in a empty regular file
832 + instead of the proper type.
833 +
834 + * Directory renaming suddenly works! What a surprise! I guess
835 + this is because renaming is implemented as making a copy and
836 + removing the original. Still this might not work
837 + everywhere...
838 +
839 +2005-03-09 Markus Klotzbuecher <mk@chasey>
840 +
841 + * Bugfix, when a mini_fo directory that exists in storage
842 + (state: MODIFIED, CREATED and DEL_REWRITTEN) is deleted, a
843 + possibly existing WOL file contained in it needs to be
844 + deleted too.
845 +
846 + * Starting cleanup: defined state names in order to get rid of
847 + the state numbers.
848 +
849 +2005-03-08 Markus Klotzbuecher <mk@chasey>
850 +
851 + * Makefile fix, fist_ioctl was built against wrong sources if ARCH=um
852 +
853 + * Fixed a bug in dentry.c, mini_fo_d_hash. In state 4 =
854 + DEL_REWRITTEN the hash was calculated from the base dentry,
855 + which was wrong and and caused assertions in
856 + __mini_fo_hidden_dentry to fail.
857 +
858 +2005-02-21 <mk@mary>
859 +
860 + * Implemented directory deleting (inode.c)
861 +
862 + * main.c: made mini_fo_parse_options a little more robust.
863 +
864 +2004-12-22 <mk@mary>
865 +
866 + * Makefile cleanup and uml stuff, removed unneccessary files
867 +
868 + * Created a new and hopefully more informative README
869 +
870 + * CHANGELOG: created a new CHANGELOG and added old entries reversely
871 +
872 +
873 +2004-10-24 Gleb Natapov <gleb@nbase.co.il>
874 +
875 + * Fix: owner and group where not correctly copied from base to
876 + storage.
877 +
878 +
879 +2004-10-05 Gleb Natapov <gleb@nbase.co.il>
880 +
881 + * Implementation of fsync, fasync and lock mini_fo functions.
882 +
883 +
884 +2004-09-29 Bob Lee <bob@pantasys.com>
885 +
886 + * Fix of a serious pointer bug
887 +
888 +
889 +2004-09-28 Gleb Natapov <gleb@nbase.co.il>
890 +
891 + * Implementation of mini_fo_mknod and mini_fo_rename, support
892 + for device files.
893 +
894 diff -urN linux-2.6.21.1.old/fs/mini_fo/dentry.c linux-2.6.21.1.dev/fs/mini_fo/dentry.c
895 --- linux-2.6.21.1.old/fs/mini_fo/dentry.c 1970-01-01 01:00:00.000000000 +0100
896 +++ linux-2.6.21.1.dev/fs/mini_fo/dentry.c 2007-05-26 21:01:26.161330176 +0200
897 @@ -0,0 +1,244 @@
898 +/*
899 + * Copyright (c) 1997-2003 Erez Zadok
900 + * Copyright (c) 2001-2003 Stony Brook University
901 + *
902 + * For specific licensing information, see the COPYING file distributed with
903 + * this package, or get one from ftp://ftp.filesystems.org/pub/fist/COPYING.
904 + *
905 + * This Copyright notice must be kept intact and distributed with all
906 + * fistgen sources INCLUDING sources generated by fistgen.
907 + */
908 +/*
909 + * Copyright (C) 2004, 2005 Markus Klotzbuecher <mk@creamnet.de>
910 + *
911 + * This program is free software; you can redistribute it and/or
912 + * modify it under the terms of the GNU General Public License
913 + * as published by the Free Software Foundation; either version
914 + * 2 of the License, or (at your option) any later version.
915 + */
916 +
917 +/*
918 + * $Id$
919 + */
920 +
921 +#ifdef HAVE_CONFIG_H
922 +# include <config.h>
923 +#endif
924 +
925 +#include "fist.h"
926 +#include "mini_fo.h"
927 +
928 +/*
929 + * THIS IS A BOOLEAN FUNCTION: returns 1 if valid, 0 otherwise.
930 + */
931 +STATIC int
932 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
933 +mini_fo_d_revalidate(dentry_t *dentry, struct nameidata *nd)
934 +#else
935 +mini_fo_d_revalidate(dentry_t *dentry, int flags)
936 +#endif
937 +{
938 + int err1 = 1; /* valid = 1, invalid = 0 */
939 + int err2 = 1;
940 + dentry_t *hidden_dentry;
941 + dentry_t *hidden_sto_dentry;
942 +
943 +
944 + check_mini_fo_dentry(dentry);
945 +
946 + hidden_dentry = dtohd(dentry);
947 + hidden_sto_dentry = dtohd2(dentry);
948 +
949 + if(hidden_dentry &&
950 + hidden_dentry->d_op &&
951 + hidden_dentry->d_op->d_revalidate) {
952 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
953 + err1 = hidden_dentry->d_op->d_revalidate(hidden_dentry, nd);
954 +#else
955 + err1 = hidden_dentry->d_op->d_revalidate(hidden_dentry, flags);
956 +#endif
957 + }
958 + if(hidden_sto_dentry &&
959 + hidden_sto_dentry->d_op &&
960 + hidden_sto_dentry->d_op->d_revalidate) {
961 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
962 + err2 = hidden_sto_dentry->d_op->d_revalidate(hidden_sto_dentry,
963 + nd);
964 +#else
965 + err2 = hidden_sto_dentry->d_op->d_revalidate(hidden_sto_dentry,
966 + flags);
967 +#endif
968 + }
969 +
970 + /* mk: if one of the lower level dentries are valid,
971 + * the mini_fo dentry is too.
972 + */
973 + return (err1 || err2);
974 +}
975 +
976 +
977 +STATIC int
978 +mini_fo_d_hash(dentry_t *dentry, qstr_t *name)
979 +{
980 + int err = 0;
981 + dentry_t *hidden_dentry;
982 + dentry_t *hidden_sto_dentry;
983 +
984 + /* hidden_dentry = mini_fo_hidden_dentry(dentry);
985 + * hidden_sto_dentry = mini_fo_hidden_sto_dentry(dentry); */
986 +
987 + /* state 1, 3, 4, 5: build the hash for the storage dentry */
988 + if((dtopd(dentry)->state == MODIFIED) ||
989 + (dtopd(dentry)->state == CREATED) ||
990 + (dtopd(dentry)->state == DEL_REWRITTEN) ||
991 + (dtopd(dentry)->state == DELETED)) {
992 + hidden_sto_dentry = dtohd2(dentry);
993 + if(hidden_sto_dentry &&
994 + hidden_sto_dentry->d_op &&
995 + hidden_sto_dentry->d_op->d_hash) {
996 + err = hidden_sto_dentry->d_op->d_hash(hidden_sto_dentry, name);
997 + }
998 + goto out;
999 + }
1000 + /* state 2: build the hash for the base dentry */
1001 + if(dtopd(dentry)->state == UNMODIFIED) {
1002 + hidden_dentry = dtohd(dentry);
1003 + if(hidden_dentry &&
1004 + hidden_dentry->d_op &&
1005 + hidden_dentry->d_op->d_hash) {
1006 + err = hidden_dentry->d_op->d_hash(hidden_dentry, name);
1007 + }
1008 + goto out;
1009 + }
1010 + /* state 6: build hash for the dentry that exists */
1011 + if(dtopd(dentry)->state == NON_EXISTANT) {
1012 + hidden_sto_dentry = dtohd2(dentry);
1013 + if(hidden_sto_dentry &&
1014 + hidden_sto_dentry->d_op &&
1015 + hidden_sto_dentry->d_op->d_hash) {
1016 + err = hidden_sto_dentry->d_op->d_hash(hidden_sto_dentry, name);
1017 + goto out;
1018 + }
1019 + hidden_dentry = dtohd(dentry);
1020 + if(hidden_dentry &&
1021 + hidden_dentry->d_op &&
1022 + hidden_dentry->d_op->d_hash) {
1023 + err = hidden_dentry->d_op->d_hash(hidden_dentry, name);
1024 + goto out;
1025 + }
1026 + }
1027 +
1028 + printk(KERN_CRIT "mini_fo: d_hash: invalid state detected.\n");
1029 +
1030 + out:
1031 + return err;
1032 +}
1033 +
1034 +
1035 +STATIC int
1036 +mini_fo_d_compare(dentry_t *dentry, qstr_t *a, qstr_t *b)
1037 +{
1038 + int err;
1039 + dentry_t *hidden_dentry=NULL;
1040 +
1041 + /* hidden_dentry = mini_fo_hidden_dentry(dentry); */
1042 + if(dtohd2(dentry))
1043 + hidden_dentry = dtohd2(dentry);
1044 + else if(dtohd(dentry))
1045 + hidden_dentry = dtohd(dentry);
1046 +
1047 + if (hidden_dentry && hidden_dentry->d_op && hidden_dentry->d_op->d_compare) {
1048 + err = hidden_dentry->d_op->d_compare(hidden_dentry, a, b);
1049 + } else {
1050 + err = ((a->len != b->len) || memcmp(a->name, b->name, b->len));
1051 + }
1052 +
1053 + return err;
1054 +}
1055 +
1056 +
1057 +int
1058 +mini_fo_d_delete(dentry_t *dentry)
1059 +{
1060 + dentry_t *hidden_dentry;
1061 + dentry_t *hidden_sto_dentry;
1062 + int err = 0;
1063 +
1064 + /* this could be a negative dentry, so check first */
1065 + if (!dtopd(dentry)) {
1066 + printk(KERN_CRIT "mini_fo_d_delete: negative dentry passed.\n");
1067 + goto out;
1068 + }
1069 + hidden_dentry = dtohd(dentry);
1070 + hidden_sto_dentry = dtohd2(dentry);
1071 +
1072 + if(hidden_dentry) {
1073 + if(hidden_dentry->d_op &&
1074 + hidden_dentry->d_op->d_delete) {
1075 + err = hidden_dentry->d_op->d_delete(hidden_dentry);
1076 + }
1077 + }
1078 + if(hidden_sto_dentry) {
1079 + if(hidden_sto_dentry->d_op &&
1080 + hidden_sto_dentry->d_op->d_delete) {
1081 + err = hidden_sto_dentry->d_op->d_delete(hidden_sto_dentry);
1082 + }
1083 + }
1084 +
1085 + out:
1086 + return err;
1087 +}
1088 +
1089 +
1090 +void
1091 +mini_fo_d_release(dentry_t *dentry)
1092 +{
1093 + dentry_t *hidden_dentry;
1094 + dentry_t *hidden_sto_dentry;
1095 +
1096 +
1097 + /* this could be a negative dentry, so check first */
1098 + if (!dtopd(dentry)) {
1099 + printk(KERN_CRIT "mini_fo_d_release: no private data.\n");
1100 + goto out;
1101 + }
1102 + hidden_dentry = dtohd(dentry);
1103 + hidden_sto_dentry = dtohd2(dentry);
1104 +
1105 + if(hidden_dentry) {
1106 + /* decrement hidden dentry's counter and free its inode */
1107 + dput(hidden_dentry);
1108 + }
1109 + if(hidden_sto_dentry) {
1110 + /* decrement hidden dentry's counter and free its inode */
1111 + dput(hidden_sto_dentry);
1112 + }
1113 +
1114 + /* free private data (mini_fo_dentry_info) here */
1115 + kfree(dtopd(dentry));
1116 + __dtopd(dentry) = NULL; /* just to be safe */
1117 + out:
1118 + return;
1119 +}
1120 +
1121 +
1122 +/*
1123 + * we don't really need mini_fo_d_iput, because dentry_iput will call iput() if
1124 + * mini_fo_d_iput is not defined. We left this implemented for ease of
1125 + * tracing/debugging.
1126 + */
1127 +void
1128 +mini_fo_d_iput(dentry_t *dentry, inode_t *inode)
1129 +{
1130 + iput(inode);
1131 +}
1132 +
1133 +
1134 +struct dentry_operations mini_fo_dops = {
1135 + d_revalidate: mini_fo_d_revalidate,
1136 + d_hash: mini_fo_d_hash,
1137 + d_compare: mini_fo_d_compare,
1138 + d_release: mini_fo_d_release,
1139 + d_delete: mini_fo_d_delete,
1140 + d_iput: mini_fo_d_iput,
1141 +};
1142 diff -urN linux-2.6.21.1.old/fs/mini_fo/file.c linux-2.6.21.1.dev/fs/mini_fo/file.c
1143 --- linux-2.6.21.1.old/fs/mini_fo/file.c 1970-01-01 01:00:00.000000000 +0100
1144 +++ linux-2.6.21.1.dev/fs/mini_fo/file.c 2007-05-26 21:01:26.162330024 +0200
1145 @@ -0,0 +1,713 @@
1146 +/*
1147 + * Copyright (c) 1997-2003 Erez Zadok
1148 + * Copyright (c) 2001-2003 Stony Brook University
1149 + *
1150 + * For specific licensing information, see the COPYING file distributed with
1151 + * this package, or get one from ftp://ftp.filesystems.org/pub/fist/COPYING.
1152 + *
1153 + * This Copyright notice must be kept intact and distributed with all
1154 + * fistgen sources INCLUDING sources generated by fistgen.
1155 + */
1156 +/*
1157 + * Copyright (C) 2004, 2005 Markus Klotzbuecher <mk@creamnet.de>
1158 + *
1159 + * This program is free software; you can redistribute it and/or
1160 + * modify it under the terms of the GNU General Public License
1161 + * as published by the Free Software Foundation; either version
1162 + * 2 of the License, or (at your option) any later version.
1163 + */
1164 +
1165 +/*
1166 + * $Id$
1167 + */
1168 +
1169 +#ifdef HAVE_CONFIG_H
1170 +# include <config.h>
1171 +#endif
1172 +
1173 +#include "fist.h"
1174 +#include "mini_fo.h"
1175 +#define ROUND_UP(x) (((x)+sizeof(long)-1) & ~(sizeof(long)-1))
1176 +
1177 +/*******************
1178 + * File Operations *
1179 + *******************/
1180 +
1181 +STATIC loff_t
1182 +mini_fo_llseek(file_t *file, loff_t offset, int origin)
1183 +{
1184 + loff_t err;
1185 + file_t *hidden_file = NULL;
1186 +
1187 + if(S_ISDIR(file->f_dentry->d_inode->i_mode)) {
1188 + /* Check if trying to llseek from a directory */
1189 + err = -EISDIR;
1190 + goto out;
1191 + }
1192 + if (ftopd(file) != NULL) {
1193 + if(ftohf2(file)) {
1194 + hidden_file = ftohf2(file);
1195 + } else {
1196 + hidden_file = ftohf(file);
1197 + }
1198 + }
1199 +
1200 + /* always set hidden position to this one */
1201 + hidden_file->f_pos = file->f_pos;
1202 +
1203 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
1204 + memcpy(&(hidden_file->f_ra),
1205 + &(file->f_ra),
1206 + sizeof(struct file_ra_state));
1207 +#else
1208 + if (file->f_reada) { /* update readahead information if needed */
1209 + hidden_file->f_reada = file->f_reada;
1210 + hidden_file->f_ramax = file->f_ramax;
1211 + hidden_file->f_raend = file->f_raend;
1212 + hidden_file->f_ralen = file->f_ralen;
1213 + hidden_file->f_rawin = file->f_rawin;
1214 + }
1215 +#endif
1216 + if (hidden_file->f_op && hidden_file->f_op->llseek)
1217 + err = hidden_file->f_op->llseek(hidden_file, offset, origin);
1218 + else
1219 + err = generic_file_llseek(hidden_file, offset, origin);
1220 +
1221 + if (err < 0)
1222 + goto out;
1223 +
1224 + if (err != file->f_pos) {
1225 + file->f_pos = err;
1226 + // ION maybe this?
1227 + // file->f_pos = hidden_file->f_pos;
1228 +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
1229 + file->f_reada = 0;
1230 +#endif
1231 + file->f_version++;
1232 + }
1233 +
1234 + out:
1235 + return err;
1236 +}
1237 +
1238 +
1239 +/* mk: fanout capable */
1240 +STATIC ssize_t
1241 +mini_fo_read(file_t *file, char *buf, size_t count, loff_t *ppos)
1242 +{
1243 + int err = -EINVAL;
1244 + file_t *hidden_file = NULL;
1245 + loff_t pos = *ppos;
1246 +
1247 + if(S_ISDIR(file->f_dentry->d_inode->i_mode)) {
1248 + /* Check if trying to read from a directory */
1249 + /* printk(KERN_CRIT "mini_fo_read: ERROR: trying to read data from a directory.\n"); */
1250 + err = -EISDIR;
1251 + goto out;
1252 + }
1253 +
1254 + if (ftopd(file) != NULL) {
1255 + if(ftohf2(file)) {
1256 + hidden_file = ftohf2(file);
1257 + } else {
1258 + hidden_file = ftohf(file);
1259 + }
1260 + }
1261 +
1262 + if (!hidden_file->f_op || !hidden_file->f_op->read)
1263 + goto out;
1264 +
1265 + err = hidden_file->f_op->read(hidden_file, buf, count, &pos);
1266 + *ppos = pos;
1267 +
1268 + if (err >= 0) {
1269 + /* atime should also be updated for reads of size zero or more */
1270 + fist_copy_attr_atime(file->f_dentry->d_inode,
1271 + hidden_file->f_dentry->d_inode);
1272 + }
1273 +
1274 +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
1275 + /*
1276 + * MAJOR HACK
1277 + * because pread() does not have any way to tell us that it is
1278 + * our caller, then we don't know for sure if we have to update
1279 + * the file positions. This hack relies on read() having passed us
1280 + * the "real" pointer of its struct file's f_pos field.
1281 + */
1282 + if (ppos == &file->f_pos)
1283 + hidden_file->f_pos = *ppos = pos;
1284 + if (hidden_file->f_reada) { /* update readahead information if needed */
1285 + file->f_reada = hidden_file->f_reada;
1286 + file->f_ramax = hidden_file->f_ramax;
1287 + file->f_raend = hidden_file->f_raend;
1288 + file->f_ralen = hidden_file->f_ralen;
1289 + file->f_rawin = hidden_file->f_rawin;
1290 + }
1291 +#else
1292 + memcpy(&(file->f_ra),&(hidden_file->f_ra),sizeof(struct file_ra_state));
1293 +#endif
1294 +
1295 + out:
1296 + return err;
1297 +}
1298 +
1299 +
1300 +/* this mini_fo_write() does not modify data pages! */
1301 +STATIC ssize_t
1302 +mini_fo_write(file_t *file, const char *buf, size_t count, loff_t *ppos)
1303 +{
1304 + int err = -EINVAL;
1305 + file_t *hidden_file = NULL;
1306 + inode_t *inode;
1307 + inode_t *hidden_inode;
1308 + loff_t pos = *ppos;
1309 +
1310 + /* mk: fan out: */
1311 + if (ftopd(file) != NULL) {
1312 + if(ftohf2(file)) {
1313 + hidden_file = ftohf2(file);
1314 + } else {
1315 + /* This is bad! We have no storage file to write to. This
1316 + * should never happen because if a file is opened for
1317 + * writing, a copy should have been made earlier.
1318 + */
1319 + printk(KERN_CRIT "mini_fo: write : ERROR, no storage file to write.\n");
1320 + err = -EINVAL;
1321 + goto out;
1322 + }
1323 + }
1324 +
1325 + inode = file->f_dentry->d_inode;
1326 + hidden_inode = itohi2(inode);
1327 + if(!hidden_inode) {
1328 + printk(KERN_CRIT "mini_fo: write: no sto inode found, not good.\n");
1329 + goto out;
1330 + }
1331 +
1332 + if (!hidden_file->f_op || !hidden_file->f_op->write)
1333 + goto out;
1334 +
1335 + /* adjust for append -- seek to the end of the file */
1336 + if (file->f_flags & O_APPEND)
1337 + pos = inode->i_size;
1338 +
1339 + err = hidden_file->f_op->write(hidden_file, buf, count, &pos);
1340 +
1341 + /*
1342 + * copy ctime and mtime from lower layer attributes
1343 + * atime is unchanged for both layers
1344 + */
1345 + if (err >= 0)
1346 + fist_copy_attr_times(inode, hidden_inode);
1347 +
1348 + *ppos = pos;
1349 +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
1350 + /*
1351 + * XXX: MAJOR HACK
1352 + *
1353 + * because pwrite() does not have any way to tell us that it is
1354 + * our caller, then we don't know for sure if we have to update
1355 + * the file positions. This hack relies on write() having passed us
1356 + * the "real" pointer of its struct file's f_pos field.
1357 + */
1358 + if (ppos == &file->f_pos)
1359 + hidden_file->f_pos = *ppos = pos;
1360 +#endif
1361 + /* update this inode's size */
1362 + if (pos > inode->i_size)
1363 + inode->i_size = pos;
1364 +
1365 + out:
1366 + return err;
1367 +}
1368 +
1369 +/* Global variable to hold a file_t pointer.
1370 + * This serves to allow mini_fo_filldir function to know which file is
1371 + * beeing read, which is required for two reasons:
1372 + *
1373 + * - be able to call wol functions in order to avoid listing deleted
1374 + * base files.
1375 + * - if we're reading a directory which is in state 1, we need to
1376 + * maintain a list (in mini_fo_filldir) of which files allready
1377 + * have been copied to userspace,to detect files existing in base
1378 + * and storage and not list them twice.
1379 + */
1380 +filldir_t mini_fo_filldir_orig;
1381 +file_t *mini_fo_filldir_file;
1382 +
1383 +/* mainly copied from fs/readdir.c */
1384 +STATIC int
1385 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
1386 +mini_fo_filldir(void * __buf, const char * name, int namlen, loff_t offset,
1387 + u64 ino, unsigned int d_type)
1388 +#else
1389 +mini_fo_filldir(void * __buf, const char * name, int namlen, loff_t offset,
1390 + ino_t ino, unsigned int d_type)
1391 +#endif
1392 +{
1393 + struct getdents_callback * buf = (struct getdents_callback *) __buf;
1394 + file_t* file = mini_fo_filldir_file;
1395 +
1396 + /* In theses states we filter meta files in storage (WOL) */
1397 + if(file && (dtopd(file->f_dentry)->state == MODIFIED ||
1398 + dtopd(file->f_dentry)->state == CREATED ||
1399 + dtopd(file->f_dentry)->state == DEL_REWRITTEN)) {
1400 +
1401 + int tmp = strlen(META_FILENAME);
1402 + if(tmp == namlen) {
1403 + if(!strncmp(name, META_FILENAME, namlen))
1404 + return 0;
1405 + }
1406 + }
1407 +
1408 + /* check if we are merging the contents of storage and base */
1409 + if(file && dtopd(file->f_dentry)->state == MODIFIED) {
1410 + /* check if we are still reading storage contents, if
1411 + * yes, we just save the name of the file for duplicate
1412 + * checking later. */
1413 +
1414 + if(!ftopd(file)->rd.sto_done) {
1415 + /* put file into ndl list */
1416 + if(ndl_add_entry(&ftopd(file)->rd, name, namlen))
1417 + printk(KERN_CRIT "mini_fo_filldir: Error adding to ndl.\n");
1418 + } else {
1419 + /* check if file has been deleted */
1420 + if(meta_check_d_entry(file->f_dentry, name, namlen))
1421 + return 0;
1422 +
1423 + /* do duplicate checking */
1424 + if(ndl_check_entry(&ftopd(file)->rd, name, namlen))
1425 + return 0;
1426 + }
1427 + }
1428 +
1429 + return mini_fo_filldir_orig(buf, name, namlen, offset, ino, d_type);
1430 +}
1431 +
1432 +
1433 +STATIC int
1434 +mini_fo_readdir(file_t *file, void *dirent, filldir_t filldir)
1435 +{
1436 + int err = 0;/* mk: ??? -ENOTDIR; */
1437 + file_t *hidden_file = NULL;
1438 + file_t *hidden_sto_file = NULL;
1439 + inode_t *inode;
1440 + struct getdents_callback *buf;
1441 + int oldcount;
1442 +
1443 +#if defined(FIST_FILTER_NAME) || defined(FIST_FILTER_SCA)
1444 + struct mini_fo_getdents_callback buf;
1445 +#endif /* FIST_FILTER_NAME || FIST_FILTER_SCA */
1446 +
1447 + buf = (struct getdents_callback *) dirent;
1448 + oldcount = buf->count;
1449 + inode = file->f_dentry->d_inode;
1450 + mini_fo_filldir_file = file;
1451 + mini_fo_filldir_orig = filldir;
1452 +
1453 + ftopd(file)->rd.sto_done = 0;
1454 + do {
1455 + if (ftopd(file) != NULL) {
1456 + if(ftohf2(file)) {
1457 + hidden_sto_file = ftohf2(file);
1458 + err = vfs_readdir(hidden_sto_file, mini_fo_filldir, dirent);
1459 + file->f_pos = hidden_sto_file->f_pos;
1460 + if (err > 0)
1461 + fist_copy_attr_atime(inode, hidden_sto_file->f_dentry->d_inode);
1462 + /* not finshed yet, we'll be called again */
1463 + if (buf->count != oldcount)
1464 + break;
1465 + }
1466 +
1467 + ftopd(file)->rd.sto_done = 1;
1468 +
1469 + if(ftohf(file)) {
1470 + hidden_file = ftohf(file);
1471 + err = vfs_readdir(hidden_file, mini_fo_filldir, dirent);
1472 + file->f_pos = hidden_file->f_pos;
1473 + if (err > 0)
1474 + fist_copy_attr_atime(inode, hidden_file->f_dentry->d_inode);
1475 + }
1476 +
1477 + }
1478 + } while (0);
1479 +
1480 + /* mk:
1481 + * we need to check if all the directory data has been copied to userspace,
1482 + * or if we will be called again by userspace to complete the operation.
1483 + */
1484 + if(buf->count == oldcount) {
1485 + ndl_put_list(&ftopd(file)->rd);
1486 + }
1487 +
1488 + /* unset this, safe */
1489 + mini_fo_filldir_file = NULL;
1490 + return err;
1491 +}
1492 +
1493 +
1494 +STATIC unsigned int
1495 +mini_fo_poll(file_t *file, poll_table *wait)
1496 +{
1497 + unsigned int mask = DEFAULT_POLLMASK;
1498 + file_t *hidden_file = NULL;
1499 +
1500 + if (ftopd(file) != NULL) {
1501 + if(ftohf2(file)) {
1502 + hidden_file = ftohf2(file);
1503 + } else {
1504 + hidden_file = ftohf(file);
1505 + }
1506 + }
1507 +
1508 + if (!hidden_file->f_op || !hidden_file->f_op->poll)
1509 + goto out;
1510 +
1511 + mask = hidden_file->f_op->poll(hidden_file, wait);
1512 +
1513 + out:
1514 + return mask;
1515 +}
1516 +
1517 +/* FIST-LITE special version of mmap */
1518 +STATIC int
1519 +mini_fo_mmap(file_t *file, vm_area_t *vma)
1520 +{
1521 + int err = 0;
1522 + file_t *hidden_file = NULL;
1523 +
1524 + /* fanout capability */
1525 + if (ftopd(file) != NULL) {
1526 + if(ftohf2(file)) {
1527 + hidden_file = ftohf2(file);
1528 + } else {
1529 + hidden_file = ftohf(file);
1530 + }
1531 + }
1532 +
1533 + ASSERT(hidden_file != NULL);
1534 + ASSERT(hidden_file->f_op != NULL);
1535 + ASSERT(hidden_file->f_op->mmap != NULL);
1536 +
1537 + vma->vm_file = hidden_file;
1538 + err = hidden_file->f_op->mmap(hidden_file, vma);
1539 + get_file(hidden_file); /* make sure it doesn't get freed on us */
1540 + fput(file); /* no need to keep extra ref on ours */
1541 +
1542 + return err;
1543 +}
1544 +
1545 +
1546 +
1547 +STATIC int
1548 +mini_fo_open(inode_t *inode, file_t *file)
1549 +{
1550 + int err = 0;
1551 + int hidden_flags;
1552 + file_t *hidden_file = NULL;
1553 + dentry_t *hidden_dentry = NULL;
1554 +
1555 + /* fanout stuff */
1556 + file_t *hidden_sto_file = NULL;
1557 + dentry_t *hidden_sto_dentry = NULL;
1558 +
1559 + __ftopd(file) =
1560 + kmalloc(sizeof(struct mini_fo_file_info), GFP_KERNEL);
1561 + if (!ftopd(file)) {
1562 + err = -ENOMEM;
1563 + goto out;
1564 + }
1565 +
1566 + /* init the readdir_helper structure */
1567 + INIT_LIST_HEAD(&ftopd(file)->rd.ndl_list);
1568 + ftopd(file)->rd.ndl_size = 0;
1569 +
1570 + /* In certain paths this could stay uninitalized and cause trouble */
1571 + ftohf(file) = NULL;
1572 + ftohf2(file) = NULL;
1573 + hidden_flags = file->f_flags;
1574 +
1575 + /* create storage files? */
1576 + if(dtost(file->f_dentry) == UNMODIFIED) {
1577 + if(!IS_WRITE_FLAG(file->f_flags)) {
1578 + hidden_dentry = dtohd(file->f_dentry);
1579 + dget(hidden_dentry);
1580 + /* dentry_open will decrement mnt refcnt if err.
1581 + * otherwise fput() will do an mntput() for us upon file close. */
1582 + mntget(stopd(inode->i_sb)->hidden_mnt);
1583 + hidden_file = dentry_open(hidden_dentry,
1584 + stopd(inode->i_sb)->hidden_mnt,
1585 + hidden_flags);
1586 + if (IS_ERR(hidden_file)) {
1587 + err = PTR_ERR(hidden_file);
1588 + dput(hidden_dentry);
1589 + goto out;
1590 + }
1591 + ftohf(file) = hidden_file; /* link two files */
1592 + goto out;
1593 + }
1594 + else {
1595 + if(S_ISDIR(file->f_dentry->d_inode->i_mode)) {
1596 + err = dir_unmod_to_mod(file->f_dentry);
1597 + } else
1598 + err = nondir_unmod_to_mod(file->f_dentry, 1);
1599 +
1600 + if (err) {
1601 + printk("mini_fo_open: ERROR creating storage file.\n");
1602 + goto out;
1603 + }
1604 + }
1605 + }
1606 + hidden_sto_dentry = dtohd2(file->f_dentry);
1607 + dget(hidden_sto_dentry);
1608 +
1609 + if(dtopd(file->f_dentry)->state == MODIFIED) {
1610 + /* Directorys are special, interpose on both lower level files */
1611 + if(S_ISDIR(itohi(inode)->i_mode)) {
1612 + /* check for invalid file types of lower level files */
1613 + if(!(S_ISDIR(itohi(inode)->i_mode) && S_ISDIR(itohi2(inode)->i_mode))) {
1614 + printk(KERN_CRIT "mini_fo_open: meta data corruption detected.\n");
1615 + dput(hidden_sto_dentry);
1616 + err = -EINVAL;
1617 + goto out;
1618 + }
1619 +
1620 + /* lower level directorys are ok, open the base file */
1621 + hidden_dentry = dtohd(file->f_dentry);
1622 + dget(hidden_dentry);
1623 +
1624 + mntget(stopd(inode->i_sb)->hidden_mnt);
1625 + hidden_file = dentry_open(hidden_dentry,
1626 + stopd(inode->i_sb)->hidden_mnt,
1627 + hidden_flags);
1628 + if (IS_ERR(hidden_file)) {
1629 + err = PTR_ERR(hidden_file);
1630 + dput(hidden_dentry);
1631 + dput(hidden_sto_dentry);
1632 + goto out;
1633 + }
1634 + ftohf(file) = hidden_file; /* link the two files */
1635 + }
1636 + }
1637 +
1638 + if(!exists_in_storage(file->f_dentry)) {
1639 + printk(KERN_CRIT "mini_fo_open: invalid file state detected.\n");
1640 + err = -EINVAL;
1641 + dput(hidden_sto_dentry);
1642 +
1643 + /* If the base file has been opened, we need to close it here */
1644 + if(ftohf(file)) {
1645 + if (hidden_file->f_op && hidden_file->f_op->flush)
1646 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
1647 + hidden_file->f_op->flush(hidden_file, NULL);
1648 +#else
1649 + hidden_file->f_op->flush(hidden_file);
1650 +#endif
1651 + dput(hidden_dentry);
1652 + }
1653 + goto out;
1654 + }
1655 +
1656 + /* ok, now we can safely open the storage file */
1657 + mntget(stopd(inode->i_sb)->hidden_mnt2);
1658 + hidden_sto_file = dentry_open(hidden_sto_dentry,
1659 + stopd(inode->i_sb)->hidden_mnt2,
1660 + hidden_flags);
1661 +
1662 + /* dentry_open dputs the dentry if it fails */
1663 + if (IS_ERR(hidden_sto_file)) {
1664 + err = PTR_ERR(hidden_sto_file);
1665 + /* close base file if open */
1666 + if(ftohf(file)) {
1667 + if (hidden_file->f_op && hidden_file->f_op->flush)
1668 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
1669 + hidden_file->f_op->flush(hidden_file, NULL);
1670 +#else
1671 + hidden_file->f_op->flush(hidden_file);
1672 +#endif
1673 + dput(hidden_dentry);
1674 + }
1675 + goto out;
1676 + }
1677 + ftohf2(file) = hidden_sto_file; /* link storage file */
1678 +
1679 + out:
1680 + if (err < 0 && ftopd(file)) {
1681 + kfree(ftopd(file));
1682 + }
1683 + return err;
1684 +}
1685 +
1686 +STATIC int
1687 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
1688 +mini_fo_flush(file_t *file, fl_owner_t id)
1689 +#else
1690 +mini_fo_flush(file_t *file)
1691 +#endif
1692 +{
1693 + int err1 = 0; /* assume ok (see open.c:close_fp) */
1694 + int err2 = 0;
1695 + file_t *hidden_file = NULL;
1696 +
1697 + check_mini_fo_file(file);
1698 +
1699 + /* mk: we don't do any state checking here, as its not worth the time.
1700 + * Just flush the lower level files if they exist.
1701 + */
1702 + if(ftopd(file) != NULL) {
1703 + if(ftohf(file) != NULL) {
1704 + hidden_file = ftohf(file);
1705 + if (hidden_file->f_op && hidden_file->f_op->flush)
1706 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
1707 + err1 = hidden_file->f_op->flush(hidden_file, id);
1708 +#else
1709 + err1 = hidden_file->f_op->flush(hidden_file);
1710 +#endif
1711 + }
1712 + if(ftohf2(file) != NULL) {
1713 + hidden_file = ftohf2(file);
1714 + if (hidden_file->f_op && hidden_file->f_op->flush)
1715 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
1716 + err2 = hidden_file->f_op->flush(hidden_file, id);
1717 +#else
1718 + err2 = hidden_file->f_op->flush(hidden_file);
1719 +#endif
1720 + }
1721 + }
1722 + return (err1 | err2);
1723 +}
1724 +
1725 +
1726 +STATIC int
1727 +mini_fo_release(inode_t *inode, file_t *file)
1728 +{
1729 + int err = 0;
1730 + file_t *hidden_file = NULL;
1731 +
1732 + if (ftopd(file) != NULL) {
1733 + if(ftohf(file)) {
1734 + hidden_file = ftohf(file);
1735 + fput(hidden_file);
1736 + }
1737 + if(ftohf2(file)) {
1738 + hidden_file = ftohf2(file);
1739 + fput(hidden_file);
1740 + }
1741 + kfree(ftopd(file));
1742 + }
1743 + return err;
1744 +}
1745 +
1746 +STATIC int
1747 +mini_fo_fsync(file_t *file, dentry_t *dentry, int datasync)
1748 +{
1749 + int err1 = 0;
1750 + int err2 = 0;
1751 + file_t *hidden_file = NULL;
1752 + dentry_t *hidden_dentry;
1753 +
1754 + check_mini_fo_file(file);
1755 +
1756 + if ((hidden_file = ftohf(file)) != NULL) {
1757 + hidden_dentry = dtohd(dentry);
1758 + if (hidden_file->f_op && hidden_file->f_op->fsync) {
1759 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
1760 + mutex_lock(&hidden_dentry->d_inode->i_mutex);
1761 +#else
1762 + down(&hidden_dentry->d_inode->i_sem);
1763 +#endif
1764 + err1 = hidden_file->f_op->fsync(hidden_file, hidden_dentry, datasync);
1765 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
1766 + mutex_unlock(&hidden_dentry->d_inode->i_mutex);
1767 +#else
1768 + up(&hidden_dentry->d_inode->i_sem);
1769 +#endif
1770 + }
1771 + }
1772 +
1773 + if ((hidden_file = ftohf2(file)) != NULL) {
1774 + hidden_dentry = dtohd2(dentry);
1775 + if (hidden_file->f_op && hidden_file->f_op->fsync) {
1776 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
1777 + mutex_lock(&hidden_dentry->d_inode->i_mutex);
1778 +#else
1779 + down(&hidden_dentry->d_inode->i_sem);
1780 +#endif
1781 + err2 = hidden_file->f_op->fsync(hidden_file, hidden_dentry, datasync);
1782 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
1783 + mutex_unlock(&hidden_dentry->d_inode->i_mutex);
1784 +#else
1785 + up(&hidden_dentry->d_inode->i_sem);
1786 +#endif
1787 + }
1788 + }
1789 + else
1790 + goto err;
1791 +
1792 +err:
1793 + return (err1 || err2);
1794 +}
1795 +
1796 +
1797 +STATIC int
1798 +mini_fo_fasync(int fd, file_t *file, int flag)
1799 +{
1800 + int err1 = 0;
1801 + int err2 = 0;
1802 +
1803 + file_t *hidden_file = NULL;
1804 +
1805 + check_mini_fo_file(file);
1806 +
1807 + if((hidden_file = ftohf(file)) != NULL) {
1808 + err1 = hidden_file->f_op->fasync(fd, hidden_file, flag);
1809 + }
1810 + if((hidden_file = ftohf2(file)) != NULL) {
1811 + err2 = hidden_file->f_op->fasync(fd, hidden_file, flag);
1812 + }
1813 +
1814 + return (err1 || err2);
1815 +}
1816 +
1817 +
1818 +
1819 +struct file_operations mini_fo_dir_fops =
1820 + {
1821 + read: generic_read_dir,
1822 + write: mini_fo_write,
1823 + readdir: mini_fo_readdir,
1824 + poll: mini_fo_poll,
1825 + /* ioctl: mini_fo_ioctl, */
1826 + mmap: mini_fo_mmap,
1827 + open: mini_fo_open,
1828 + flush: mini_fo_flush,
1829 + release: mini_fo_release,
1830 + fsync: mini_fo_fsync,
1831 + fasync: mini_fo_fasync,
1832 + /* not needed lock: mini_fo_lock, */
1833 + /* not needed: readv */
1834 + /* not needed: writev */
1835 + /* not implemented: sendpage */
1836 + /* not implemented: get_unmapped_area */
1837 + };
1838 +
1839 +struct file_operations mini_fo_main_fops =
1840 + {
1841 + llseek: mini_fo_llseek,
1842 + read: mini_fo_read,
1843 + write: mini_fo_write,
1844 + readdir: mini_fo_readdir,
1845 + poll: mini_fo_poll,
1846 + /* ioctl: mini_fo_ioctl, */
1847 + mmap: mini_fo_mmap,
1848 + open: mini_fo_open,
1849 + flush: mini_fo_flush,
1850 + release: mini_fo_release,
1851 + fsync: mini_fo_fsync,
1852 + fasync: mini_fo_fasync,
1853 + /* not needed: lock: mini_fo_lock, */
1854 + /* not needed: readv */
1855 + /* not needed: writev */
1856 + /* not implemented: sendpage */
1857 + /* not implemented: get_unmapped_area */
1858 + };
1859 diff -urN linux-2.6.21.1.old/fs/mini_fo/fist.h linux-2.6.21.1.dev/fs/mini_fo/fist.h
1860 --- linux-2.6.21.1.old/fs/mini_fo/fist.h 1970-01-01 01:00:00.000000000 +0100
1861 +++ linux-2.6.21.1.dev/fs/mini_fo/fist.h 2007-05-26 21:01:26.162330024 +0200
1862 @@ -0,0 +1,252 @@
1863 +/*
1864 + * Copyright (c) 1997-2003 Erez Zadok
1865 + * Copyright (c) 2001-2003 Stony Brook University
1866 + *
1867 + * For specific licensing information, see the COPYING file distributed with
1868 + * this package, or get one from ftp://ftp.filesystems.org/pub/fist/COPYING.
1869 + *
1870 + * This Copyright notice must be kept intact and distributed with all
1871 + * fistgen sources INCLUDING sources generated by fistgen.
1872 + */
1873 +/*
1874 + * Copyright (C) 2004, 2005 Markus Klotzbuecher <mk@creamnet.de>
1875 + *
1876 + * This program is free software; you can redistribute it and/or
1877 + * modify it under the terms of the GNU General Public License
1878 + * as published by the Free Software Foundation; either version
1879 + * 2 of the License, or (at your option) any later version.
1880 + */
1881 +
1882 +
1883 +/*
1884 + * $Id$
1885 + */
1886 +
1887 +#ifndef __FIST_H_
1888 +#define __FIST_H_
1889 +
1890 +/*
1891 + * KERNEL ONLY CODE:
1892 + */
1893 +#ifdef __KERNEL__
1894 +#include <linux/version.h>
1895 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,19)
1896 +#include <linux/autoconf.h>
1897 +#else
1898 +#include <linux/config.h>
1899 +#endif
1900 +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
1901 +#ifdef CONFIG_MODVERSIONS
1902 +# define MODVERSIONS
1903 +# include <linux/modversions.h>
1904 +#endif /* CONFIG_MODVERSIONS */
1905 +#endif /* KERNEL_VERSION < 2.6.0 */
1906 +#include <linux/sched.h>
1907 +#include <linux/kernel.h>
1908 +#include <linux/mm.h>
1909 +#include <linux/string.h>
1910 +#include <linux/stat.h>
1911 +#include <linux/errno.h>
1912 +#include <linux/wait.h>
1913 +#include <linux/limits.h>
1914 +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
1915 +#include <linux/locks.h>
1916 +#else
1917 +#include <linux/buffer_head.h>
1918 +#include <linux/pagemap.h>
1919 +#include <linux/namei.h>
1920 +#include <linux/module.h>
1921 +#include <linux/mount.h>
1922 +#include <linux/page-flags.h>
1923 +#include <linux/writeback.h>
1924 +#include <linux/statfs.h>
1925 +#endif
1926 +#include <linux/smp.h>
1927 +#include <linux/smp_lock.h>
1928 +#include <linux/file.h>
1929 +#include <linux/slab.h>
1930 +#include <linux/vmalloc.h>
1931 +#include <linux/poll.h>
1932 +#include <linux/list.h>
1933 +#include <linux/init.h>
1934 +
1935 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,20)
1936 +#include <linux/xattr.h>
1937 +#endif
1938 +
1939 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
1940 +#include <linux/security.h>
1941 +#endif
1942 +
1943 +#include <linux/swap.h>
1944 +
1945 +#include <asm/system.h>
1946 +/* #include <asm/segment.h> */
1947 +#include <asm/mman.h>
1948 +#include <linux/seq_file.h>
1949 +
1950 +/*
1951 + * MACROS:
1952 + */
1953 +
1954 +/* those mapped to ATTR_* were copied from linux/fs.h */
1955 +#define FA_MODE ATTR_MODE
1956 +#define FA_UID ATTR_UID
1957 +#define FA_GID ATTR_GID
1958 +#define FA_SIZE ATTR_SIZE
1959 +#define FA_ATIME ATTR_ATIME
1960 +#define FA_MTIME ATTR_MTIME
1961 +#define FA_CTIME ATTR_CTIME
1962 +#define FA_ATIME_SET ATTR_ATIME_SET
1963 +#define FA_MTIME_SET ATTR_MTIME_SET
1964 +#define FA_FORCE ATTR_FORCE
1965 +#define FA_ATTR_FLAGS ATTR_ATTR_FLAG
1966 +
1967 +/* must be greater than all other ATTR_* flags! */
1968 +#define FA_NLINK 2048
1969 +#define FA_BLKSIZE 4096
1970 +#define FA_BLOCKS 8192
1971 +#define FA_TIMES (FA_ATIME|FA_MTIME|FA_CTIME)
1972 +#define FA_ALL 0
1973 +
1974 +/* macros to manage changes between kernels */
1975 +#define INODE_DATA(i) (&(i)->i_data)
1976 +
1977 +#define MIN(x,y) ((x < y) ? (x) : (y))
1978 +#define MAX(x,y) ((x > y) ? (x) : (y))
1979 +#define MAXPATHLEN PATH_MAX
1980 +
1981 +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,4,5)
1982 +# define lookup_one_len(a,b,c) lookup_one(a,b)
1983 +#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(2,4,5) */
1984 +
1985 +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,4,8)
1986 +# define generic_file_llseek default_llseek
1987 +#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(2,4,8) */
1988 +
1989 +#ifndef SEEK_SET
1990 +# define SEEK_SET 0
1991 +#endif /* not SEEK_SET */
1992 +
1993 +#ifndef SEEK_CUR
1994 +# define SEEK_CUR 1
1995 +#endif /* not SEEK_CUR */
1996 +
1997 +#ifndef SEEK_END
1998 +# define SEEK_END 2
1999 +#endif /* not SEEK_END */
2000 +
2001 +#ifndef DEFAULT_POLLMASK
2002 +# define DEFAULT_POLLMASK (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)
2003 +#endif /* not DEFAULT_POLLMASK */
2004 +
2005 +/* XXX: fix this so fistgen generates kfree() code directly */
2006 +#define kfree_s(a,b) kfree(a)
2007 +
2008 +/*
2009 + * TYPEDEFS:
2010 + */
2011 +typedef struct dentry dentry_t;
2012 +typedef struct file file_t;
2013 +typedef struct inode inode_t;
2014 +typedef inode_t vnode_t;
2015 +typedef struct page page_t;
2016 +typedef struct qstr qstr_t;
2017 +typedef struct super_block super_block_t;
2018 +typedef super_block_t vfs_t;
2019 +typedef struct vm_area_struct vm_area_t;
2020 +
2021 +
2022 +/*
2023 + * EXTERNALS:
2024 + */
2025 +
2026 +#define FPPF(str,page) printk("PPF %s 0x%x/%d: Lck:%d Err:%d Ref:%d Upd:%d Other::%d:%d:%d:%d:\n", \
2027 + str, \
2028 + (int) page, \
2029 + (int) page->index, \
2030 + (PageLocked(page) ? 1 : 0), \
2031 + (PageError(page) ? 1 : 0), \
2032 + (PageReferenced(page) ? 1 : 0), \
2033 + (Page_Uptodate(page) ? 1 : 0), \
2034 + (PageDecrAfter(page) ? 1 : 0), \
2035 + (PageSlab(page) ? 1 : 0), \
2036 + (PageSwapCache(page) ? 1 : 0), \
2037 + (PageReserved(page) ? 1 : 0) \
2038 + )
2039 +#define EZKDBG printk("EZK %s:%d:%s\n",__FILE__,__LINE__,__FUNCTION__)
2040 +#if 0
2041 +# define EZKDBG1 printk("EZK %s:%d\n",__FILE__,__LINE__)
2042 +#else
2043 +# define EZKDBG1
2044 +#endif
2045 +
2046 +extern int fist_get_debug_value(void);
2047 +extern int fist_set_debug_value(int val);
2048 +#if 0 /* mini_fo doesn't need these */
2049 +extern void fist_dprint_internal(int level, char *str,...);
2050 +extern void fist_print_dentry(char *str, const dentry_t *dentry);
2051 +extern void fist_print_inode(char *str, const inode_t *inode);
2052 +extern void fist_print_file(char *str, const file_t *file);
2053 +extern void fist_print_buffer_flags(char *str, struct buffer_head *buffer);
2054 +extern void fist_print_page_flags(char *str, page_t *page);
2055 +extern void fist_print_page_bytes(char *str, page_t *page);
2056 +extern void fist_print_pte_flags(char *str, const page_t *page);
2057 +extern void fist_checkinode(inode_t *inode, char *msg);
2058 +extern void fist_print_sb(char *str, const super_block_t *sb);
2059 +
2060 +/* ยง$% by mk: special debug functions */
2061 +extern void fist_mk_print_dentry(char *str, const dentry_t *dentry);
2062 +extern void fist_mk_print_inode(char *str, const inode_t *inode);
2063 +
2064 +extern char *add_indent(void);
2065 +extern char *del_indent(void);
2066 +#endif/* mini_fo doesn't need these */
2067 +
2068 +
2069 +#define STATIC
2070 +#define ASSERT(EX) \
2071 +do { \
2072 + if (!(EX)) { \
2073 + printk(KERN_CRIT "ASSERTION FAILED: %s at %s:%d (%s)\n", #EX, \
2074 + __FILE__, __LINE__, __FUNCTION__); \
2075 + (*((char *)0))=0; \
2076 + } \
2077 +} while (0)
2078 +/* same ASSERT, but tell me who was the caller of the function */
2079 +#define ASSERT2(EX) \
2080 +do { \
2081 + if (!(EX)) { \
2082 + printk(KERN_CRIT "ASSERTION FAILED (caller): %s at %s:%d (%s)\n", #EX, \
2083 + file, line, func); \
2084 + (*((char *)0))=0; \
2085 + } \
2086 +} while (0)
2087 +
2088 +#if 0 /* mini_fo doesn't need these */
2089 +#define dprintk(format, args...) printk(KERN_DEBUG format, ##args)
2090 +#define fist_dprint(level, str, args...) fist_dprint_internal(level, KERN_DEBUG str, ## args)
2091 +#define print_entry_location() fist_dprint(4, "%sIN: %s %s:%d\n", add_indent(), __FUNCTION__, __FILE__, __LINE__)
2092 +#define print_exit_location() fist_dprint(4, "%s OUT: %s %s:%d\n", del_indent(), __FUNCTION__, __FILE__, __LINE__)
2093 +#define print_exit_status(status) fist_dprint(4, "%s OUT: %s %s:%d, STATUS: %d\n", del_indent(), __FUNCTION__, __FILE__, __LINE__, status)
2094 +#define print_exit_pointer(status) \
2095 +do { \
2096 + if (IS_ERR(status)) \
2097 + fist_dprint(4, "%s OUT: %s %s:%d, RESULT: %ld\n", del_indent(), __FUNCTION__, __FILE__, __LINE__, PTR_ERR(status)); \
2098 + else \
2099 + fist_dprint(4, "%s OUT: %s %s:%d, RESULT: 0x%x\n", del_indent(), __FUNCTION__, __FILE__, __LINE__, PTR_ERR(status)); \
2100 +} while (0)
2101 +#endif/* mini_fo doesn't need these */
2102 +
2103 +#endif /* __KERNEL__ */
2104 +
2105 +
2106 +/*
2107 + * DEFINITIONS FOR USER AND KERNEL CODE:
2108 + * (Note: ioctl numbers 1--9 are reserved for fistgen, the rest
2109 + * are auto-generated automatically based on the user's .fist file.)
2110 + */
2111 +# define FIST_IOCTL_GET_DEBUG_VALUE _IOR(0x15, 1, int)
2112 +# define FIST_IOCTL_SET_DEBUG_VALUE _IOW(0x15, 2, int)
2113 +
2114 +#endif /* not __FIST_H_ */
2115 diff -urN linux-2.6.21.1.old/fs/mini_fo/inode.c linux-2.6.21.1.dev/fs/mini_fo/inode.c
2116 --- linux-2.6.21.1.old/fs/mini_fo/inode.c 1970-01-01 01:00:00.000000000 +0100
2117 +++ linux-2.6.21.1.dev/fs/mini_fo/inode.c 2007-05-26 21:01:26.164329720 +0200
2118 @@ -0,0 +1,1573 @@
2119 +/*
2120 + * Copyright (c) 1997-2003 Erez Zadok
2121 + * Copyright (c) 2001-2003 Stony Brook University
2122 + *
2123 + * For specific licensing information, see the COPYING file distributed with
2124 + * this package, or get one from ftp://ftp.filesystems.org/pub/fist/COPYING.
2125 + *
2126 + * This Copyright notice must be kept intact and distributed with all
2127 + * fistgen sources INCLUDING sources generated by fistgen.
2128 + */
2129 +/*
2130 + * Copyright (C) 2004, 2005 Markus Klotzbuecher <mk@creamnet.de>
2131 + *
2132 + * This program is free software; you can redistribute it and/or
2133 + * modify it under the terms of the GNU General Public License
2134 + * as published by the Free Software Foundation; either version
2135 + * 2 of the License, or (at your option) any later version.
2136 + */
2137 +
2138 +/*
2139 + * $Id$
2140 + */
2141 +
2142 +#ifdef HAVE_CONFIG_H
2143 +# include <config.h>
2144 +#endif
2145 +
2146 +#include "fist.h"
2147 +#include "mini_fo.h"
2148 +
2149 +STATIC int
2150 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
2151 +mini_fo_create(inode_t *dir, dentry_t *dentry, int mode, struct nameidata *nd)
2152 +#else
2153 +mini_fo_create(inode_t *dir, dentry_t *dentry, int mode)
2154 +#endif
2155 +{
2156 + int err = 0;
2157 +
2158 + check_mini_fo_dentry(dentry);
2159 +
2160 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
2161 + err = create_sto_reg_file(dentry, mode, nd);
2162 +#else
2163 + err = create_sto_reg_file(dentry, mode);
2164 +#endif
2165 + check_mini_fo_dentry(dentry);
2166 + return err;
2167 +}
2168 +
2169 +
2170 +STATIC dentry_t *
2171 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
2172 +mini_fo_lookup(inode_t *dir, dentry_t *dentry, struct nameidata* nd)
2173 +#else
2174 +mini_fo_lookup(inode_t *dir, dentry_t *dentry)
2175 +#endif
2176 +{
2177 + int err = 0;
2178 + dentry_t *hidden_dir_dentry;
2179 + dentry_t *hidden_dentry = NULL;
2180 +
2181 + dentry_t *hidden_sto_dir_dentry;
2182 + dentry_t *hidden_sto_dentry = NULL;
2183 +
2184 + /* whiteout flag */
2185 + int del_flag = 0;
2186 + char *bpath = NULL;
2187 +
2188 + const char *name;
2189 + unsigned int namelen;
2190 +
2191 + /* Don't allow lookups of META-files */
2192 + namelen = strlen(META_FILENAME);
2193 + if(namelen == dentry->d_name.len) {
2194 + if(!strncmp(dentry->d_name.name, META_FILENAME, namelen)) {
2195 + err = -ENOENT;
2196 + goto out;
2197 + }
2198 + }
2199 +
2200 + hidden_dir_dentry = dtohd(dentry->d_parent);
2201 + hidden_sto_dir_dentry = dtohd2(dentry->d_parent);
2202 +
2203 + name = dentry->d_name.name;
2204 + namelen = dentry->d_name.len;
2205 +
2206 + /* must initialize dentry operations */
2207 + dentry->d_op = &mini_fo_dops;
2208 +
2209 + /* setup the del_flag */
2210 + del_flag = __meta_check_d_entry(dir, name, namelen);
2211 + bpath = __meta_check_r_entry(dir, name, namelen);
2212 +
2213 + /* perform the lookups of base and storage files:
2214 + *
2215 + * This caused some serious trouble, as a lookup_one_len passing
2216 + * a negative dentry oopses. Solution is to only do the lookup
2217 + * if the dentry is positive, else we set it to NULL
2218 + * More trouble, who said a *_dir_dentry can't be NULL?
2219 + */
2220 + if(bpath) {
2221 + /* Cross-Interposing (C), yeah! */
2222 + hidden_dentry = bpath_walk(dir->i_sb, bpath);
2223 + if(!hidden_dentry || !hidden_dentry->d_inode) {
2224 + printk(KERN_CRIT "mini_fo_lookup: bpath_walk failed.\n");
2225 + err= -EINVAL;
2226 + goto out;
2227 + }
2228 +
2229 + /* this can be set up safely without fear of spaghetti
2230 + * interposing as it is only used for copying times */
2231 + hidden_dir_dentry = hidden_dentry->d_parent;
2232 + kfree(bpath);
2233 + }
2234 + else if(hidden_dir_dentry && hidden_dir_dentry->d_inode)
2235 + hidden_dentry =
2236 + lookup_one_len(name, hidden_dir_dentry, namelen);
2237 + else
2238 + hidden_dentry = NULL;
2239 +
2240 + if(hidden_sto_dir_dentry && hidden_sto_dir_dentry->d_inode)
2241 + hidden_sto_dentry =
2242 + lookup_one_len(name, hidden_sto_dir_dentry, namelen);
2243 + else
2244 + hidden_sto_dentry = NULL;
2245 +
2246 + /* catch error in lookup */
2247 + if (IS_ERR(hidden_dentry) || IS_ERR(hidden_sto_dentry)) {
2248 + /* mk: we need to call dput on the dentry, whose
2249 + * lookup_one_len operation failed, in order to avoid
2250 + * unmount trouble.
2251 + */
2252 + if(IS_ERR(hidden_dentry)) {
2253 + printk(KERN_CRIT "mini_fo_lookup: ERR from base dentry, lookup failed.\n");
2254 + err = PTR_ERR(hidden_dentry);
2255 + } else {
2256 + dput(hidden_dentry);
2257 + }
2258 + if(IS_ERR(hidden_sto_dentry)) {
2259 + printk(KERN_CRIT "mini_fo_lookup: ERR from storage dentry, lookup failed.\n");
2260 + err = PTR_ERR(hidden_sto_dentry);
2261 + } else {
2262 + dput(hidden_sto_dentry);
2263 + }
2264 + goto out;
2265 + }
2266 +
2267 + /* allocate dentry private data */
2268 + __dtopd(dentry) = (struct mini_fo_dentry_info *)
2269 + kmalloc(sizeof(struct mini_fo_dentry_info), GFP_KERNEL);
2270 +
2271 + if (!dtopd(dentry)) {
2272 + err = -ENOMEM;
2273 + goto out_dput;
2274 + }
2275 +
2276 + /* check for different states of the mini_fo file to be looked up. */
2277 +
2278 + /* state 1, file has been modified */
2279 + if(hidden_dentry && hidden_sto_dentry &&
2280 + hidden_dentry->d_inode && hidden_sto_dentry->d_inode && !del_flag) {
2281 +
2282 + /* update parent directory's atime */
2283 + fist_copy_attr_atime(dir, hidden_sto_dir_dentry->d_inode);
2284 +
2285 + dtopd(dentry)->state = MODIFIED;
2286 + dtohd(dentry) = hidden_dentry;
2287 + dtohd2(dentry) = hidden_sto_dentry;
2288 +
2289 + err = mini_fo_tri_interpose(hidden_dentry,
2290 + hidden_sto_dentry,
2291 + dentry, dir->i_sb, 1);
2292 + if (err) {
2293 + printk(KERN_CRIT "mini_fo_lookup: error interposing (state1).\n");
2294 + goto out_free;
2295 + }
2296 + goto out;
2297 + }
2298 + /* state 2, file is unmodified */
2299 + if(hidden_dentry && hidden_dentry->d_inode && !del_flag) {
2300 +
2301 + fist_copy_attr_atime(dir, hidden_dir_dentry->d_inode);
2302 +
2303 + dtopd(dentry)->state = UNMODIFIED;
2304 + dtohd(dentry) = hidden_dentry;
2305 + dtohd2(dentry) = hidden_sto_dentry; /* could be negative */
2306 +
2307 + err = mini_fo_tri_interpose(hidden_dentry,
2308 + hidden_sto_dentry,
2309 + dentry, dir->i_sb, 1);
2310 + if (err) {
2311 + printk(KERN_CRIT "mini_fo_lookup: error interposing (state2).\n");
2312 + goto out_free;
2313 + }
2314 + goto out;
2315 + }
2316 + /* state 3, file has been newly created */
2317 + if(hidden_sto_dentry && hidden_sto_dentry->d_inode && !del_flag) {
2318 +
2319 + fist_copy_attr_atime(dir, hidden_sto_dir_dentry->d_inode);
2320 + dtopd(dentry)->state = CREATED;
2321 + dtohd(dentry) = hidden_dentry; /* could be negative */
2322 + dtohd2(dentry) = hidden_sto_dentry;
2323 +
2324 + err = mini_fo_tri_interpose(hidden_dentry,
2325 + hidden_sto_dentry,
2326 + dentry, dir->i_sb, 1);
2327 + if (err) {
2328 + printk(KERN_CRIT "mini_fo_lookup: error interposing (state3).\n");
2329 + goto out_free;
2330 + }
2331 + goto out;
2332 + }
2333 +
2334 + /* state 4, file has deleted and created again. */
2335 + if(hidden_dentry && hidden_sto_dentry &&
2336 + hidden_dentry->d_inode &&
2337 + hidden_sto_dentry->d_inode && del_flag) {
2338 +
2339 + fist_copy_attr_atime(dir, hidden_sto_dir_dentry->d_inode);
2340 + dtopd(dentry)->state = DEL_REWRITTEN;
2341 + dtohd(dentry) = NULL;
2342 + dtohd2(dentry) = hidden_sto_dentry;
2343 +
2344 + err = mini_fo_tri_interpose(NULL,
2345 + hidden_sto_dentry,
2346 + dentry, dir->i_sb, 1);
2347 + if (err) {
2348 + printk(KERN_CRIT "mini_fo_lookup: error interposing (state4).\n");
2349 + goto out_free;
2350 + }
2351 + /* We will never need this dentry again, as the file has been
2352 + * deleted from base */
2353 + dput(hidden_dentry);
2354 + goto out;
2355 + }
2356 + /* state 5, file has been deleted in base */
2357 + if(hidden_dentry && hidden_sto_dentry &&
2358 + hidden_dentry->d_inode &&
2359 + !hidden_sto_dentry->d_inode && del_flag) {
2360 +
2361 + /* check which parents atime we need for updating */
2362 + if(hidden_sto_dir_dentry->d_inode)
2363 + fist_copy_attr_atime(dir,
2364 + hidden_sto_dir_dentry->d_inode);
2365 + else
2366 + fist_copy_attr_atime(dir,
2367 + hidden_dir_dentry->d_inode);
2368 +
2369 + dtopd(dentry)->state = DELETED;
2370 + dtohd(dentry) = NULL;
2371 + dtohd2(dentry) = hidden_sto_dentry;
2372 +
2373 + /* add negative dentry to dcache to speed up lookups */
2374 + d_add(dentry, NULL);
2375 + dput(hidden_dentry);
2376 + goto out;
2377 + }
2378 + /* state 6, file does not exist */
2379 + if(((hidden_dentry && !hidden_dentry->d_inode) ||
2380 + (hidden_sto_dentry && !hidden_sto_dentry->d_inode)) && !del_flag)
2381 + {
2382 + /* check which parents atime we need for updating */
2383 + if(hidden_sto_dir_dentry && hidden_sto_dir_dentry->d_inode)
2384 + fist_copy_attr_atime(dir, hidden_sto_dir_dentry->d_inode);
2385 + else
2386 + fist_copy_attr_atime(dir, hidden_dir_dentry->d_inode);
2387 +
2388 + dtopd(dentry)->state = NON_EXISTANT;
2389 + dtohd(dentry) = hidden_dentry;
2390 + dtohd2(dentry) = hidden_sto_dentry;
2391 + d_add(dentry, NULL);
2392 + goto out;
2393 + }
2394 +
2395 + /* if we get to here, were in an invalid state. bad. */
2396 + printk(KERN_CRIT "mini_fo_lookup: ERROR, meta data corruption detected.\n");
2397 +
2398 + /* end state checking */
2399 + out_free:
2400 + d_drop(dentry); /* so that our bad dentry will get destroyed */
2401 + kfree(dtopd(dentry));
2402 + __dtopd(dentry) = NULL; /* be safe */
2403 +
2404 + out_dput:
2405 + if(hidden_dentry)
2406 + dput(hidden_dentry);
2407 + if(hidden_sto_dentry)
2408 + dput(hidden_sto_dentry); /* drops usage count and marks for release */
2409 +
2410 + out:
2411 + /* initalize wol if file exists and is directory */
2412 + if(dentry->d_inode) {
2413 + if(S_ISDIR(dentry->d_inode->i_mode)) {
2414 + itopd(dentry->d_inode)->deleted_list_size = -1;
2415 + itopd(dentry->d_inode)->renamed_list_size = -1;
2416 + meta_build_lists(dentry);
2417 + }
2418 + }
2419 + return ERR_PTR(err);
2420 +}
2421 +
2422 +
2423 +STATIC int
2424 +mini_fo_link(dentry_t *old_dentry, inode_t *dir, dentry_t *new_dentry)
2425 +{
2426 + int err;
2427 + dentry_t *hidden_old_dentry;
2428 + dentry_t *hidden_new_dentry;
2429 + dentry_t *hidden_dir_dentry;
2430 +
2431 +
2432 + check_mini_fo_dentry(old_dentry);
2433 + check_mini_fo_dentry(new_dentry);
2434 + check_mini_fo_inode(dir);
2435 +
2436 + /* no links to directorys and existing targets target allowed */
2437 + if(S_ISDIR(old_dentry->d_inode->i_mode) ||
2438 + is_mini_fo_existant(new_dentry)) {
2439 + err = -EPERM;
2440 + goto out;
2441 + }
2442 +
2443 + /* bring it directly from unmod to del_rew */
2444 + if(dtost(old_dentry) == UNMODIFIED) {
2445 + err = nondir_unmod_to_mod(old_dentry, 1);
2446 + if(err) {
2447 + err = -EINVAL;
2448 + goto out;
2449 + }
2450 + err = meta_add_d_entry(old_dentry->d_parent,
2451 + old_dentry->d_name.name,
2452 + old_dentry->d_name.len);
2453 + if(err) {
2454 + err = -EINVAL;
2455 + goto out;
2456 + }
2457 + dput(dtohd(old_dentry));
2458 + dtohd(old_dentry) = NULL;
2459 + dtost(old_dentry) = DEL_REWRITTEN;
2460 + }
2461 +
2462 + err = get_neg_sto_dentry(new_dentry);
2463 + if(err) {
2464 + err = -EINVAL;
2465 + goto out;
2466 + }
2467 +
2468 + hidden_old_dentry = dtohd2(old_dentry);
2469 + hidden_new_dentry = dtohd2(new_dentry);
2470 +
2471 + dget(hidden_old_dentry);
2472 + dget(hidden_new_dentry);
2473 +
2474 + /* was: hidden_dir_dentry = lock_parent(hidden_new_dentry); */
2475 + hidden_dir_dentry = dget(hidden_new_dentry->d_parent);
2476 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
2477 + mutex_lock(&hidden_dir_dentry->d_inode->i_mutex);
2478 +#else
2479 + down(&hidden_dir_dentry->d_inode->i_sem);
2480 +#endif
2481 +
2482 + err = vfs_link(hidden_old_dentry,
2483 + hidden_dir_dentry->d_inode,
2484 + hidden_new_dentry);
2485 + if (err || !hidden_new_dentry->d_inode)
2486 + goto out_lock;
2487 +
2488 + dtost(new_dentry) = CREATED;
2489 + err = mini_fo_tri_interpose(NULL, hidden_new_dentry, new_dentry, dir->i_sb, 0);
2490 + if (err)
2491 + goto out_lock;
2492 +
2493 + fist_copy_attr_timesizes(dir, hidden_new_dentry->d_inode);
2494 + /* propagate number of hard-links */
2495 + old_dentry->d_inode->i_nlink = itohi2(old_dentry->d_inode)->i_nlink;
2496 +
2497 + out_lock:
2498 + /* was: unlock_dir(hidden_dir_dentry); */
2499 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
2500 + mutex_unlock(&hidden_dir_dentry->d_inode->i_mutex);
2501 +#else
2502 + up(&hidden_dir_dentry->d_inode->i_sem);
2503 +#endif
2504 + dput(hidden_dir_dentry);
2505 +
2506 + dput(hidden_new_dentry);
2507 + dput(hidden_old_dentry);
2508 + if (!new_dentry->d_inode)
2509 + d_drop(new_dentry);
2510 +
2511 + out:
2512 + return err;
2513 +}
2514 +
2515 +
2516 +STATIC int
2517 +mini_fo_unlink(inode_t *dir, dentry_t *dentry)
2518 +{
2519 + int err = 0;
2520 +
2521 + dget(dentry);
2522 + if(dtopd(dentry)->state == MODIFIED) {
2523 + err = nondir_mod_to_del(dentry);
2524 + goto out;
2525 + }
2526 + else if(dtopd(dentry)->state == UNMODIFIED) {
2527 + err = nondir_unmod_to_del(dentry);
2528 + goto out;
2529 + }
2530 + else if(dtopd(dentry)->state == CREATED) {
2531 + err = nondir_creat_to_del(dentry);
2532 + goto out;
2533 + }
2534 + else if(dtopd(dentry)->state == DEL_REWRITTEN) {
2535 + err = nondir_del_rew_to_del(dentry);
2536 + goto out;
2537 + }
2538 +
2539 + printk(KERN_CRIT "mini_fo_unlink: ERROR, invalid state detected.\n");
2540 +
2541 + out:
2542 + fist_copy_attr_times(dir, itohi2(dentry->d_parent->d_inode));
2543 +
2544 + if(!err) {
2545 + /* is this causing my pain? d_delete(dentry); */
2546 + d_drop(dentry);
2547 + }
2548 +
2549 + dput(dentry);
2550 + return err;
2551 +}
2552 +
2553 +
2554 +STATIC int
2555 +mini_fo_symlink(inode_t *dir, dentry_t *dentry, const char *symname)
2556 +{
2557 + int err=0;
2558 + dentry_t *hidden_sto_dentry;
2559 + dentry_t *hidden_sto_dir_dentry;
2560 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
2561 + umode_t mode;
2562 +#endif
2563 +
2564 + /* Fail if the symlink file exists */
2565 + if(!(dtost(dentry) == DELETED ||
2566 + dtost(dentry) == NON_EXISTANT)) {
2567 + err = -EEXIST;
2568 + goto out;
2569 + }
2570 +
2571 + err = get_neg_sto_dentry(dentry);
2572 + if(err) {
2573 + err = -EINVAL;
2574 + goto out;
2575 + }
2576 + hidden_sto_dentry = dtohd2(dentry);
2577 +
2578 + dget(hidden_sto_dentry);
2579 + /* was: hidden_sto_dir_dentry = lock_parent(hidden_sto_dentry); */
2580 + hidden_sto_dir_dentry = dget(hidden_sto_dentry->d_parent);
2581 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
2582 + mutex_lock(&hidden_sto_dir_dentry->d_inode->i_mutex);
2583 +#else
2584 + down(&hidden_sto_dir_dentry->d_inode->i_sem);
2585 +#endif
2586 +
2587 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
2588 + mode = S_IALLUGO;
2589 + err = vfs_symlink(hidden_sto_dir_dentry->d_inode,
2590 + hidden_sto_dentry, symname, mode);
2591 +#else
2592 + err = vfs_symlink(hidden_sto_dir_dentry->d_inode,
2593 + hidden_sto_dentry,
2594 + symname);
2595 +#endif
2596 + if (err || !hidden_sto_dentry->d_inode)
2597 + goto out_lock;
2598 +
2599 + if(dtost(dentry) == DELETED) {
2600 + dtost(dentry) = DEL_REWRITTEN;
2601 + err = mini_fo_tri_interpose(NULL, hidden_sto_dentry, dentry, dir->i_sb, 0);
2602 + if(err)
2603 + goto out_lock;
2604 + } else if(dtost(dentry) == NON_EXISTANT) {
2605 + dtost(dentry) = CREATED;
2606 + err = mini_fo_tri_interpose(dtohd(dentry), hidden_sto_dentry, dentry, dir->i_sb, 0);
2607 + if(err)
2608 + goto out_lock;
2609 + }
2610 + fist_copy_attr_timesizes(dir, hidden_sto_dir_dentry->d_inode);
2611 +
2612 + out_lock:
2613 + /* was: unlock_dir(hidden_sto_dir_dentry); */
2614 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
2615 + mutex_unlock(&hidden_sto_dir_dentry->d_inode->i_mutex);
2616 +#else
2617 + up(&hidden_sto_dir_dentry->d_inode->i_sem);
2618 +#endif
2619 + dput(hidden_sto_dir_dentry);
2620 +
2621 + dput(hidden_sto_dentry);
2622 + if (!dentry->d_inode)
2623 + d_drop(dentry);
2624 + out:
2625 + return err;
2626 +}
2627 +
2628 +STATIC int
2629 +mini_fo_mkdir(inode_t *dir, dentry_t *dentry, int mode)
2630 +{
2631 + int err;
2632 +
2633 + err = create_sto_dir(dentry, mode);
2634 +
2635 + check_mini_fo_dentry(dentry);
2636 +
2637 + return err;
2638 +}
2639 +
2640 +
2641 +STATIC int
2642 +mini_fo_rmdir(inode_t *dir, dentry_t *dentry)
2643 +{
2644 + int err = 0;
2645 +
2646 + dentry_t *hidden_sto_dentry;
2647 + dentry_t *hidden_sto_dir_dentry;
2648 + dentry_t *meta_dentry;
2649 + inode_t *hidden_sto_dir = NULL;
2650 +
2651 + check_mini_fo_dentry(dentry);
2652 + check_mini_fo_inode(dir);
2653 +
2654 + dget(dentry);
2655 + if(dtopd(dentry)->state == MODIFIED) {
2656 + /* XXX: disabled, because it does not bother to check files on
2657 + * the original filesystem - just a hack, but better than simply
2658 + * removing it without testing */
2659 + err = -EINVAL;
2660 + goto out;
2661 +
2662 + hidden_sto_dir = itohi2(dir);
2663 + hidden_sto_dentry = dtohd2(dentry);
2664 +
2665 + /* was:hidden_sto_dir_dentry = lock_parent(hidden_sto_dentry); */
2666 + hidden_sto_dir_dentry = dget(hidden_sto_dentry->d_parent);
2667 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
2668 + mutex_lock(&hidden_sto_dir_dentry->d_inode->i_mutex);
2669 +#else
2670 + down(&hidden_sto_dir_dentry->d_inode->i_sem);
2671 +#endif
2672 +
2673 + /* avoid destroying the hidden inode if the file is in use */
2674 + dget(hidden_sto_dentry);
2675 +
2676 + /* Delete an old WOL file contained in the storage dir */
2677 + meta_dentry = lookup_one_len(META_FILENAME,
2678 + hidden_sto_dentry,
2679 + strlen(META_FILENAME));
2680 + if(meta_dentry->d_inode) {
2681 + err = vfs_unlink(hidden_sto_dentry->d_inode, meta_dentry);
2682 + dput(meta_dentry);
2683 + if(!err)
2684 + d_delete(meta_dentry);
2685 + }
2686 +
2687 + err = vfs_rmdir(hidden_sto_dir, hidden_sto_dentry);
2688 + dput(hidden_sto_dentry);
2689 + if(!err)
2690 + d_delete(hidden_sto_dentry);
2691 +
2692 + /* propagate number of hard-links */
2693 + dentry->d_inode->i_nlink = itohi2(dentry->d_inode)->i_nlink;
2694 +
2695 + dput(dtohd(dentry));
2696 +
2697 + dtohd(dentry) = NULL;
2698 + dtopd(dentry)->state = DELETED;
2699 +
2700 + /* carefull with R files */
2701 + if( __meta_is_r_entry(dir,
2702 + dentry->d_name.name,
2703 + dentry->d_name.len) == 1) {
2704 + err = meta_remove_r_entry(dentry->d_parent,
2705 + dentry->d_name.name,
2706 + dentry->d_name.len);
2707 + if(err) {
2708 + printk(KERN_CRIT "mini_fo: rmdir: meta_remove_r_entry failed.\n");
2709 + goto out;
2710 + }
2711 + }
2712 + else {
2713 + /* ok, add deleted file to META */
2714 + meta_add_d_entry(dentry->d_parent,
2715 + dentry->d_name.name,
2716 + dentry->d_name.len);
2717 + }
2718 + /* was: unlock_dir(hidden_sto_dir_dentry); */
2719 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
2720 + mutex_unlock(&hidden_sto_dir_dentry->d_inode->i_mutex);
2721 +#else
2722 + up(&hidden_sto_dir_dentry->d_inode->i_sem);
2723 +#endif
2724 + dput(hidden_sto_dir_dentry);
2725 + goto out;
2726 + }
2727 + else if(dtopd(dentry)->state == UNMODIFIED) {
2728 + /* XXX: simply adding it to the delete list here is fscking dangerous!
2729 + * as a temporary hack, i will disable rmdir on unmodified directories
2730 + * for now.
2731 + */
2732 + err = -EINVAL;
2733 + goto out;
2734 +
2735 + err = get_neg_sto_dentry(dentry);
2736 + if(err) {
2737 + err = -EINVAL;
2738 + goto out;
2739 + }
2740 +
2741 + /* dput base dentry, this will relase the inode and free the
2742 + * dentry, as we will never need it again. */
2743 + dput(dtohd(dentry));
2744 + dtohd(dentry) = NULL;
2745 + dtopd(dentry)->state = DELETED;
2746 +
2747 + /* add deleted file to META-file */
2748 + meta_add_d_entry(dentry->d_parent,
2749 + dentry->d_name.name,
2750 + dentry->d_name.len);
2751 + goto out;
2752 + }
2753 + else if(dtopd(dentry)->state == CREATED) {
2754 + hidden_sto_dir = itohi2(dir);
2755 + hidden_sto_dentry = dtohd2(dentry);
2756 +
2757 + /* was: hidden_sto_dir_dentry = lock_parent(hidden_sto_dentry);*/
2758 + hidden_sto_dir_dentry = dget(hidden_sto_dentry->d_parent);
2759 +
2760 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
2761 + mutex_lock(&hidden_sto_dir_dentry->d_inode->i_mutex);
2762 +#else
2763 + down(&hidden_sto_dir_dentry->d_inode->i_sem);
2764 +#endif
2765 +
2766 + /* avoid destroying the hidden inode if the file is in use */
2767 + dget(hidden_sto_dentry);
2768 +
2769 + /* Delete an old WOL file contained in the storage dir */
2770 + meta_dentry = lookup_one_len(META_FILENAME,
2771 + hidden_sto_dentry,
2772 + strlen(META_FILENAME));
2773 + if(meta_dentry->d_inode) {
2774 + /* is this necessary? dget(meta_dentry); */
2775 + err = vfs_unlink(hidden_sto_dentry->d_inode,
2776 + meta_dentry);
2777 + dput(meta_dentry);
2778 + if(!err)
2779 + d_delete(meta_dentry);
2780 + }
2781 +
2782 + err = vfs_rmdir(hidden_sto_dir, hidden_sto_dentry);
2783 + dput(hidden_sto_dentry);
2784 + if(!err)
2785 + d_delete(hidden_sto_dentry);
2786 +
2787 + /* propagate number of hard-links */
2788 + dentry->d_inode->i_nlink = itohi2(dentry->d_inode)->i_nlink;
2789 + dtopd(dentry)->state = NON_EXISTANT;
2790 +
2791 + /* was: unlock_dir(hidden_sto_dir_dentry); */
2792 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
2793 + mutex_unlock(&hidden_sto_dir_dentry->d_inode->i_mutex);
2794 +#else
2795 + up(&hidden_sto_dir_dentry->d_inode->i_sem);
2796 +#endif
2797 + dput(hidden_sto_dir_dentry);
2798 +
2799 + goto out;
2800 + }
2801 + else if(dtopd(dentry)->state == DEL_REWRITTEN) {
2802 + hidden_sto_dir = itohi2(dir);
2803 + hidden_sto_dentry = dtohd2(dentry);
2804 +
2805 + /* was: hidden_sto_dir_dentry = lock_parent(hidden_sto_dentry);*/
2806 + hidden_sto_dir_dentry = dget(hidden_sto_dentry->d_parent);
2807 +
2808 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
2809 + mutex_lock(&hidden_sto_dir_dentry->d_inode->i_mutex);
2810 +#else
2811 + down(&hidden_sto_dir_dentry->d_inode->i_sem);
2812 +#endif
2813 +
2814 + /* avoid destroying the hidden inode if the file is in use */
2815 + dget(hidden_sto_dentry);
2816 +
2817 + /* Delete an old WOL file contained in the storage dir */
2818 + meta_dentry = lookup_one_len(META_FILENAME,
2819 + hidden_sto_dentry,
2820 + strlen(META_FILENAME));
2821 + if(meta_dentry->d_inode) {
2822 + /* is this necessary? dget(meta_dentry); */
2823 + err = vfs_unlink(hidden_sto_dentry->d_inode,
2824 + meta_dentry);
2825 + dput(meta_dentry);
2826 + if(!err)
2827 + d_delete(meta_dentry);
2828 + }
2829 +
2830 + err = vfs_rmdir(hidden_sto_dir, hidden_sto_dentry);
2831 + dput(hidden_sto_dentry);
2832 + if(!err)
2833 + d_delete(hidden_sto_dentry);
2834 +
2835 + /* propagate number of hard-links */
2836 + dentry->d_inode->i_nlink = itohi2(dentry->d_inode)->i_nlink;
2837 + dtopd(dentry)->state = DELETED;
2838 + /* was: unlock_dir(hidden_sto_dir_dentry); */
2839 +
2840 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
2841 + mutex_unlock(&hidden_sto_dir_dentry->d_inode->i_mutex);
2842 +#else
2843 + up(&hidden_sto_dir_dentry->d_inode->i_sem);
2844 +#endif
2845 + dput(hidden_sto_dir_dentry);
2846 + goto out;
2847 + }
2848 +
2849 + printk(KERN_CRIT "mini_fo_rmdir: ERROR, invalid state detected.\n");
2850 +
2851 + out:
2852 + if(!err) {
2853 + d_drop(dentry);
2854 + }
2855 +
2856 + fist_copy_attr_times(dir, itohi2(dentry->d_parent->d_inode));
2857 + dput(dentry);
2858 +
2859 + return err;
2860 +}
2861 +
2862 +
2863 +STATIC int
2864 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
2865 +mini_fo_mknod(inode_t *dir, dentry_t *dentry, int mode, dev_t dev)
2866 +#else
2867 +mini_fo_mknod(inode_t *dir, dentry_t *dentry, int mode, int dev)
2868 +#endif
2869 +{
2870 + int err = 0;
2871 +
2872 + check_mini_fo_dentry(dentry);
2873 +
2874 + err = create_sto_nod(dentry, mode, dev);
2875 + if(err) {
2876 + printk(KERN_CRIT "mini_fo_mknod: creating sto nod failed.\n");
2877 + err = -EINVAL;
2878 + }
2879 +
2880 + check_mini_fo_dentry(dentry);
2881 + return err;
2882 +}
2883 +
2884 +
2885 +STATIC int
2886 +mini_fo_rename(inode_t *old_dir, dentry_t *old_dentry,
2887 + inode_t *new_dir, dentry_t *new_dentry)
2888 +{
2889 + /* dispatch */
2890 + if(S_ISDIR(old_dentry->d_inode->i_mode))
2891 + return rename_directory(old_dir, old_dentry, new_dir, new_dentry);
2892 + return rename_nondir(old_dir, old_dentry, new_dir, new_dentry);
2893 +
2894 +}
2895 +
2896 +int rename_directory(inode_t *old_dir, dentry_t *old_dentry,
2897 + inode_t *new_dir, dentry_t *new_dentry)
2898 +{
2899 + int err, bpath_len;
2900 + char *bpath;
2901 +
2902 + dentry_t *hidden_old_dentry;
2903 + dentry_t *hidden_new_dentry;
2904 + dentry_t *hidden_old_dir_dentry;
2905 + dentry_t *hidden_new_dir_dentry;
2906 +
2907 + err = 0;
2908 + bpath = NULL;
2909 + bpath_len = 0;
2910 +
2911 + /* this is a test, chuck out if it works */
2912 + if(!(dtopd(new_dentry)->state == DELETED ||
2913 + dtopd(new_dentry)->state == NON_EXISTANT)) {
2914 + printk(KERN_CRIT "mini_fo: rename_directory: \
2915 + uh, ah, new_dentry not negative.\n");
2916 + /* return -1; */
2917 + }
2918 +
2919 + /* state = UNMODIFIED */
2920 + if(dtopd(old_dentry)->state == UNMODIFIED) {
2921 + err = dir_unmod_to_mod(old_dentry);
2922 + if (err)
2923 + goto out;
2924 + }
2925 +
2926 + /* state = MODIFIED */
2927 + if(dtopd(old_dentry)->state == MODIFIED) {
2928 + bpath = meta_check_r_entry(old_dentry->d_parent,
2929 + old_dentry->d_name.name,
2930 + old_dentry->d_name.len);
2931 + if(bpath) {
2932 + err = meta_remove_r_entry(old_dentry->d_parent,
2933 + old_dentry->d_name.name,
2934 + old_dentry->d_name.len);
2935 + if(err) {
2936 + printk(KERN_CRIT "mini_fo: rename_directory:\
2937 + meta_remove_r_entry \
2938 + failed.\n");
2939 + goto out;
2940 + }
2941 + err = meta_add_r_entry(new_dentry->d_parent,
2942 + bpath,
2943 + strlen(bpath),
2944 + new_dentry->d_name.name,
2945 + new_dentry->d_name.len);
2946 + kfree(bpath);
2947 + }
2948 + else {/* wol it */
2949 + err = meta_add_d_entry(old_dentry->d_parent,
2950 + old_dentry->d_name.name,
2951 + old_dentry->d_name.len);
2952 + if (err)
2953 + goto out;
2954 + /* put it on rename list */
2955 + err = get_mini_fo_bpath(old_dentry,
2956 + &bpath,
2957 + &bpath_len);
2958 + if (err)
2959 + goto out;
2960 + err = meta_add_r_entry(new_dentry->d_parent,
2961 + bpath, bpath_len,
2962 + new_dentry->d_name.name,
2963 + new_dentry->d_name.len);
2964 + if (err)
2965 + goto out;
2966 + }
2967 + /* no state change, MODIFIED stays MODIFIED */
2968 + }
2969 + /* state = CREATED */
2970 + if(dtopd(old_dentry)->state == CREATED ||
2971 + dtopd(old_dentry)->state == DEL_REWRITTEN) {
2972 + if(dtohd(old_dentry))
2973 + dput(dtohd(old_dentry));
2974 +
2975 + if(dtopd(new_dentry)->state == DELETED) {
2976 + dtopd(old_dentry)->state = DEL_REWRITTEN;
2977 + dtohd(old_dentry) = NULL;
2978 + }
2979 + else if(dtopd(new_dentry)->state == NON_EXISTANT) {
2980 + dtopd(old_dentry)->state = CREATED;
2981 + /* steal new dentry's neg. base dentry */
2982 + dtohd(old_dentry) = dtohd(new_dentry);
2983 + dtohd(new_dentry) = NULL;
2984 + }
2985 + }
2986 + if(dtopd(new_dentry)->state == UNMODIFIED ||
2987 + dtopd(new_dentry)->state == NON_EXISTANT) {
2988 + err = get_neg_sto_dentry(new_dentry);
2989 + if(err)
2990 + goto out;
2991 + }
2992 +
2993 + /* now move sto file */
2994 + hidden_old_dentry = dtohd2(old_dentry);
2995 + hidden_new_dentry = dtohd2(new_dentry);
2996 +
2997 + dget(hidden_old_dentry);
2998 + dget(hidden_new_dentry);
2999 +
3000 + hidden_old_dir_dentry = dget(hidden_old_dentry->d_parent);
3001 + hidden_new_dir_dentry = dget(hidden_new_dentry->d_parent);
3002 + double_lock(hidden_old_dir_dentry, hidden_new_dir_dentry);
3003 +
3004 + err = vfs_rename(hidden_old_dir_dentry->d_inode, hidden_old_dentry,
3005 + hidden_new_dir_dentry->d_inode, hidden_new_dentry);
3006 + if(err)
3007 + goto out_lock;
3008 +
3009 + fist_copy_attr_all(new_dir, hidden_new_dir_dentry->d_inode);
3010 + if (new_dir != old_dir)
3011 + fist_copy_attr_all(old_dir,
3012 + hidden_old_dir_dentry->d_inode);
3013 +
3014 + out_lock:
3015 + /* double_unlock will dput the new/old parent dentries
3016 + * whose refcnts were incremented via get_parent above. */
3017 + double_unlock(hidden_old_dir_dentry, hidden_new_dir_dentry);
3018 + dput(hidden_new_dentry);
3019 + dput(hidden_old_dentry);
3020 +
3021 + out:
3022 + return err;
3023 +}
3024 +
3025 +int rename_nondir(inode_t *old_dir, dentry_t *old_dentry,
3026 + inode_t *new_dir, dentry_t *new_dentry)
3027 +{
3028 + int err=0;
3029 +
3030 + check_mini_fo_dentry(old_dentry);
3031 + check_mini_fo_dentry(new_dentry);
3032 + check_mini_fo_inode(old_dir);
3033 + check_mini_fo_inode(new_dir);
3034 +
3035 + /* state: UNMODIFIED */
3036 + if(dtost(old_dentry) == UNMODIFIED) {
3037 + err = nondir_unmod_to_mod(old_dentry, 1);
3038 + if(err) {
3039 + err = -EINVAL;
3040 + goto out;
3041 + }
3042 + }
3043 +
3044 + /* the easy states */
3045 + if(exists_in_storage(old_dentry)) {
3046 +
3047 + dentry_t *hidden_old_dentry;
3048 + dentry_t *hidden_new_dentry;
3049 + dentry_t *hidden_old_dir_dentry;
3050 + dentry_t *hidden_new_dir_dentry;
3051 +
3052 + /* if old file is MODIFIED, add it to the deleted_list */
3053 + if(dtopd(old_dentry)->state == MODIFIED) {
3054 + meta_add_d_entry(old_dentry->d_parent,
3055 + old_dentry->d_name.name,
3056 + old_dentry->d_name.len);
3057 +
3058 + dput(dtohd(old_dentry));
3059 + }
3060 + /* if old file is CREATED, we only release the base dentry */
3061 + if(dtopd(old_dentry)->state == CREATED) {
3062 + if(dtohd(old_dentry))
3063 + dput(dtohd(old_dentry));
3064 + }
3065 +
3066 + /* now setup the new states (depends on new_dentry state) */
3067 + /* new dentry state = MODIFIED */
3068 + if(dtopd(new_dentry)->state == MODIFIED) {
3069 + meta_add_d_entry(new_dentry->d_parent,
3070 + new_dentry->d_name.name,
3071 + new_dentry->d_name.len);
3072 +
3073 + /* new dentry will be d_put'ed later by the vfs
3074 + * so don't do it here
3075 + * dput(dtohd(new_dentry));
3076 + */
3077 + dtohd(old_dentry) = NULL;
3078 + dtopd(old_dentry)->state = DEL_REWRITTEN;
3079 + }
3080 + /* new dentry state = UNMODIFIED */
3081 + else if(dtopd(new_dentry)->state == UNMODIFIED) {
3082 + if(get_neg_sto_dentry(new_dentry))
3083 + return -EINVAL;
3084 +
3085 + meta_add_d_entry(new_dentry->d_parent,
3086 + new_dentry->d_name.name,
3087 + new_dentry->d_name.len);
3088 +
3089 + /* is this right??? */
3090 + /*dput(dtohd(new_dentry));*/
3091 + dtohd(old_dentry) = NULL;
3092 + dtopd(old_dentry)->state = DEL_REWRITTEN;
3093 + }
3094 + /* new dentry state = CREATED */
3095 + else if(dtopd(new_dentry)->state == CREATED) {
3096 + /* we keep the neg. base dentry (if exists) */
3097 + dtohd(old_dentry) = dtohd(new_dentry);
3098 + /* ...and set it to Null, or we'll get
3099 + * dcache.c:345 if it gets dput twice... */
3100 + dtohd(new_dentry) = NULL;
3101 + dtopd(old_dentry)->state = CREATED;
3102 + }
3103 + /* new dentry state = NON_EXISTANT */
3104 + else if(dtopd(new_dentry)->state == NON_EXISTANT) {
3105 + if(get_neg_sto_dentry(new_dentry))
3106 + return -EINVAL;
3107 +
3108 + /* we keep the neg. base dentry (if exists) */
3109 + dtohd(old_dentry) = dtohd(new_dentry);
3110 + /* ...and set it to Null, or we'll get
3111 + * Dr. dcache.c:345 if it gets dput twice... */
3112 + dtohd(new_dentry) = NULL;
3113 + dtopd(old_dentry)->state = CREATED;
3114 + }
3115 + /* new dentry state = DEL_REWRITTEN or DELETED */
3116 + else if(dtopd(new_dentry)->state == DEL_REWRITTEN ||
3117 + dtopd(new_dentry)->state == DELETED) {
3118 + dtohd(old_dentry) = NULL;
3119 + dtopd(old_dentry)->state = DEL_REWRITTEN;
3120 + }
3121 + else { /* not possible, uhh, ahh */
3122 + printk(KERN_CRIT
3123 + "mini_fo: rename_reg_file: invalid state detected [1].\n");
3124 + return -1;
3125 + }
3126 +
3127 + /* now we definitely have a sto file */
3128 + hidden_old_dentry = dtohd2(old_dentry);
3129 + hidden_new_dentry = dtohd2(new_dentry);
3130 +
3131 + dget(hidden_old_dentry);
3132 + dget(hidden_new_dentry);
3133 +
3134 + hidden_old_dir_dentry = dget(hidden_old_dentry->d_parent);
3135 + hidden_new_dir_dentry = dget(hidden_new_dentry->d_parent);
3136 + double_lock(hidden_old_dir_dentry, hidden_new_dir_dentry);
3137 +
3138 + err = vfs_rename(hidden_old_dir_dentry->d_inode,
3139 + hidden_old_dentry,
3140 + hidden_new_dir_dentry->d_inode,
3141 + hidden_new_dentry);
3142 + if(err)
3143 + goto out_lock;
3144 +
3145 + fist_copy_attr_all(new_dir, hidden_new_dir_dentry->d_inode);
3146 + if (new_dir != old_dir)
3147 + fist_copy_attr_all(old_dir, hidden_old_dir_dentry->d_inode);
3148 +
3149 + out_lock:
3150 + /* double_unlock will dput the new/old parent dentries
3151 + * whose refcnts were incremented via get_parent above.
3152 + */
3153 + double_unlock(hidden_old_dir_dentry, hidden_new_dir_dentry);
3154 + dput(hidden_new_dentry);
3155 + dput(hidden_old_dentry);
3156 + out:
3157 + return err;
3158 + }
3159 + else { /* invalid state */
3160 + printk(KERN_CRIT "mini_fo: rename_reg_file: ERROR: invalid state detected [2].\n");
3161 + return -1;
3162 + }
3163 +}
3164 +
3165 +
3166 +STATIC int
3167 +mini_fo_readlink(dentry_t *dentry, char *buf, int bufsiz)
3168 +{
3169 + int err=0;
3170 + dentry_t *hidden_dentry = NULL;
3171 +
3172 + if(dtohd2(dentry) && dtohd2(dentry)->d_inode) {
3173 + hidden_dentry = dtohd2(dentry);
3174 + } else if(dtohd(dentry) && dtohd(dentry)->d_inode) {
3175 + hidden_dentry = dtohd(dentry);
3176 + } else {
3177 + goto out;
3178 + }
3179 +
3180 + if (!hidden_dentry->d_inode->i_op ||
3181 + !hidden_dentry->d_inode->i_op->readlink) {
3182 + err = -EINVAL; goto out;
3183 + }
3184 +
3185 + err = hidden_dentry->d_inode->i_op->readlink(hidden_dentry,
3186 + buf,
3187 + bufsiz);
3188 + if (err > 0)
3189 + fist_copy_attr_atime(dentry->d_inode, hidden_dentry->d_inode);
3190 +
3191 + out:
3192 + return err;
3193 +}
3194 +
3195 +
3196 +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,13)
3197 +static int mini_fo_follow_link(dentry_t *dentry, struct nameidata *nd)
3198 +#else
3199 +static void* mini_fo_follow_link(dentry_t *dentry, struct nameidata *nd)
3200 +#endif
3201 +{
3202 + char *buf;
3203 + int len = PAGE_SIZE, err;
3204 + mm_segment_t old_fs;
3205 +
3206 + /* in 2.6 this is freed by mini_fo_put_link called by __do_follow_link */
3207 + buf = kmalloc(len, GFP_KERNEL);
3208 + if (!buf) {
3209 + err = -ENOMEM;
3210 + goto out;
3211 + }
3212 +
3213 + /* read the symlink, and then we will follow it */
3214 + old_fs = get_fs();
3215 + set_fs(KERNEL_DS);
3216 + err = dentry->d_inode->i_op->readlink(dentry, buf, len);
3217 + set_fs(old_fs);
3218 + if (err < 0) {
3219 + kfree(buf);
3220 + buf = NULL;
3221 + goto out;
3222 + }
3223 + buf[err] = 0;
3224 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
3225 + nd_set_link(nd, buf);
3226 + err = 0;
3227 +#else
3228 + err = vfs_follow_link(nd, buf);
3229 +#endif
3230 +
3231 + out:
3232 +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
3233 + kfree(buf);
3234 +#endif
3235 +
3236 +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,13)
3237 + return err;
3238 +#else
3239 + return ERR_PTR(err);
3240 +#endif
3241 +}
3242 +
3243 +STATIC
3244 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
3245 +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,13)
3246 +void mini_fo_put_link(struct dentry *dentry, struct nameidata *nd)
3247 +#else
3248 +void mini_fo_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie)
3249 +#endif
3250 +{
3251 + char *link;
3252 + link = nd_get_link(nd);
3253 + kfree(link);
3254 +}
3255 +#endif
3256 +
3257 +STATIC int
3258 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
3259 +mini_fo_permission(inode_t *inode, int mask, struct nameidata *nd)
3260 +#else
3261 +mini_fo_permission(inode_t *inode, int mask)
3262 +#endif
3263 +{
3264 + inode_t *hidden_inode;
3265 + int mode;
3266 + int err;
3267 +
3268 + if(itohi2(inode)) {
3269 + hidden_inode = itohi2(inode);
3270 + } else {
3271 + hidden_inode = itohi(inode);
3272 + }
3273 + mode = inode->i_mode;
3274 +
3275 + /* not really needed, as permission handles everything:
3276 + * err = vfs_permission(inode, mask);
3277 + * if (err)
3278 + * goto out;
3279 + */
3280 +
3281 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
3282 + err = permission(hidden_inode, mask, nd);
3283 +#else
3284 + err = permission(hidden_inode, mask);
3285 +#endif
3286 +
3287 + /* out: */
3288 + return err;
3289 +}
3290 +
3291 +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
3292 +STATIC int
3293 +mini_fo_inode_revalidate(dentry_t *dentry)
3294 +{
3295 + int err = 0;
3296 + dentry_t *hidden_dentry;
3297 + inode_t *hidden_inode;
3298 +
3299 + ASSERT(dentry->d_inode);
3300 + ASSERT(itopd(dentry->d_inode));
3301 +
3302 + if(itohi2(dentry->d_inode)) {
3303 + hidden_dentry = dtohd2(dentry);
3304 + hidden_inode = hidden_dentry->d_inode;
3305 + } else if(itohi(dentry->d_inode)) {
3306 + hidden_dentry = dtohd(dentry);
3307 + hidden_inode = hidden_dentry->d_inode;
3308 + } else {
3309 + printk(KERN_CRIT "mini_fo_inode_revalidate: ERROR, invalid state detected.\n");
3310 + err = -ENOENT;
3311 + goto out;
3312 + }
3313 + if (hidden_inode && hidden_inode->i_op && hidden_inode->i_op->revalidate){
3314 + err = hidden_inode->i_op->revalidate(hidden_dentry);
3315 + if (err)
3316 + goto out;
3317 + }
3318 + fist_copy_attr_all(dentry->d_inode, hidden_inode);
3319 + out:
3320 + return err;
3321 +}
3322 +#endif
3323 +
3324 +STATIC int
3325 +mini_fo_setattr(dentry_t *dentry, struct iattr *ia)
3326 +{
3327 + int err = 0;
3328 +
3329 + check_mini_fo_dentry(dentry);
3330 +
3331 + if(!is_mini_fo_existant(dentry)) {
3332 + printk(KERN_CRIT "mini_fo_setattr: ERROR, invalid state detected [1].\n");
3333 + goto out;
3334 + }
3335 +
3336 + if(dtost(dentry) == UNMODIFIED) {
3337 + if(!IS_COPY_FLAG(ia->ia_valid))
3338 + goto out; /* we ignore these changes to base */
3339 +
3340 + if(S_ISDIR(dentry->d_inode->i_mode)) {
3341 + err = dir_unmod_to_mod(dentry);
3342 + } else {
3343 + /* we copy contents if file is not beeing truncated */
3344 + if(S_ISREG(dentry->d_inode->i_mode) &&
3345 + !(ia->ia_size == 0 && (ia->ia_valid & ATTR_SIZE))) {
3346 + err = nondir_unmod_to_mod(dentry, 1);
3347 + } else
3348 + err = nondir_unmod_to_mod(dentry, 0);
3349 + }
3350 + if(err) {
3351 + err = -EINVAL;
3352 + printk(KERN_CRIT "mini_fo_setattr: ERROR changing states.\n");
3353 + goto out;
3354 + }
3355 + }
3356 + if(!exists_in_storage(dentry)) {
3357 + printk(KERN_CRIT "mini_fo_setattr: ERROR, invalid state detected [2].\n");
3358 + err = -EINVAL;
3359 + goto out;
3360 + }
3361 + ASSERT(dentry->d_inode);
3362 + ASSERT(dtohd2(dentry));
3363 + ASSERT(itopd(dentry->d_inode));
3364 + ASSERT(itohi2(dentry->d_inode));
3365 +
3366 + err = notify_change(dtohd2(dentry), ia);
3367 + fist_copy_attr_all(dentry->d_inode, itohi2(dentry->d_inode));
3368 + out:
3369 + return err;
3370 +}
3371 +
3372 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
3373 +STATIC int
3374 +mini_fo_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
3375 +{
3376 + int err = 0;
3377 + dentry_t *hidden_dentry;
3378 +
3379 + ASSERT(dentry->d_inode);
3380 + ASSERT(itopd(dentry->d_inode));
3381 +
3382 + if(itohi2(dentry->d_inode)) {
3383 + hidden_dentry = dtohd2(dentry);
3384 + } else if(itohi(dentry->d_inode)) {
3385 + hidden_dentry = dtohd(dentry);
3386 + } else {
3387 + printk(KERN_CRIT "mini_fo_getattr: ERROR, invalid state detected.\n");
3388 + err = -ENOENT;
3389 + goto out;
3390 + }
3391 + fist_copy_attr_all(dentry->d_inode, hidden_dentry->d_inode);
3392 +
3393 + ASSERT(hidden_dentry);
3394 + ASSERT(hidden_dentry->d_inode);
3395 + ASSERT(hidden_dentry->d_inode->i_op);
3396 +
3397 + generic_fillattr(dentry->d_inode, stat);
3398 + if (!stat->blksize) {
3399 + struct super_block *s = hidden_dentry->d_inode->i_sb;
3400 + unsigned blocks;
3401 + blocks = (stat->size+s->s_blocksize-1) >> s->s_blocksize_bits;
3402 + stat->blocks = (s->s_blocksize / 512) * blocks;
3403 + stat->blksize = s->s_blocksize;
3404 + }
3405 + out:
3406 + return err;
3407 +}
3408 +#endif
3409 +
3410 +#if defined(XATTR) && (LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,20))
3411 +#if 0 /* no xattr_alloc() and xattr_free() */
3412 +/* This is lifted from fs/xattr.c */
3413 +static void *
3414 +xattr_alloc(size_t size, size_t limit)
3415 +{
3416 + void *ptr;
3417 +
3418 + if (size > limit)
3419 + return ERR_PTR(-E2BIG);
3420 +
3421 + if (!size) /* size request, no buffer is needed */
3422 + return NULL;
3423 + else if (size <= PAGE_SIZE)
3424 + ptr = kmalloc((unsigned long) size, GFP_KERNEL);
3425 + else
3426 + ptr = vmalloc((unsigned long) size);
3427 + if (!ptr)
3428 + return ERR_PTR(-ENOMEM);
3429 + return ptr;
3430 +}
3431 +
3432 +static void
3433 +xattr_free(void *ptr, size_t size)
3434 +{
3435 + if (!size) /* size request, no buffer was needed */
3436 + return;
3437 + else if (size <= PAGE_SIZE)
3438 + kfree(ptr);
3439 + else
3440 + vfree(ptr);
3441 +}
3442 +#endif /* no xattr_alloc() and xattr_free() */
3443 +
3444 +/* BKL held by caller.
3445 + * dentry->d_inode->i_sem down
3446 + */
3447 +STATIC int
3448 +mini_fo_getxattr(struct dentry *dentry, const char *name, void *value, size_t size) {
3449 + struct dentry *hidden_dentry = NULL;
3450 + int err = -EOPNOTSUPP;
3451 + /* Define these anyway so we don't need as much ifdef'ed code. */
3452 + char *encoded_name = NULL;
3453 + char *encoded_value = NULL;
3454 +
3455 + check_mini_fo_dentry(dentry);
3456 +
3457 + if(exists_in_storage(dentry))
3458 + hidden_dentry = dtohd2(dentry);
3459 + else
3460 + hidden_dentry = dtohd(dentry);
3461 +
3462 + ASSERT(hidden_dentry);
3463 + ASSERT(hidden_dentry->d_inode);
3464 + ASSERT(hidden_dentry->d_inode->i_op);
3465 +
3466 + if (hidden_dentry->d_inode->i_op->getxattr) {
3467 + encoded_name = (char *)name;
3468 + encoded_value = (char *)value;
3469 +
3470 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
3471 + mutex_lock(&hidden_dentry->d_inode->i_mutex);
3472 +#else
3473 + down(&hidden_dentry->d_inode->i_sem);
3474 +#endif
3475 + /* lock_kernel() already done by caller. */
3476 + err = hidden_dentry->d_inode->i_op->getxattr(hidden_dentry, encoded_name, encoded_value, size);
3477 + /* unlock_kernel() will be done by caller. */
3478 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
3479 + mutex_lock(&hidden_dentry->d_inode->i_mutex);
3480 +#else
3481 + up(&hidden_dentry->d_inode->i_sem);
3482 +#endif
3483 + }
3484 + return err;
3485 +}
3486 +
3487 +/* BKL held by caller.
3488 + * dentry->d_inode->i_sem down
3489 + */
3490 +STATIC int
3491 +#if ((LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,21) \
3492 + && LINUX_VERSION_CODE <= KERNEL_VERSION(2,4,23)) \
3493 + || LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0))
3494 +mini_fo_setxattr(struct dentry *dentry, const char *name,
3495 + const void *value, size_t size, int flags)
3496 +#else
3497 +mini_fo_setxattr(struct dentry *dentry, const char *name,
3498 + void *value, size_t size, int flags)
3499 +#endif
3500 +
3501 +{
3502 + struct dentry *hidden_dentry = NULL;
3503 + int err = -EOPNOTSUPP;
3504 +
3505 + /* Define these anyway, so we don't have as much ifdef'ed code. */
3506 + char *encoded_value = NULL;
3507 + char *encoded_name = NULL;
3508 +
3509 + check_mini_fo_dentry(dentry);
3510 +
3511 + if(exists_in_storage(dentry))
3512 + hidden_dentry = dtohd2(dentry);
3513 + else
3514 + hidden_dentry = dtohd(dentry);
3515 +
3516 + ASSERT(hidden_dentry);
3517 + ASSERT(hidden_dentry->d_inode);
3518 + ASSERT(hidden_dentry->d_inode->i_op);
3519 +
3520 + if (hidden_dentry->d_inode->i_op->setxattr) {
3521 + encoded_name = (char *)name;
3522 + encoded_value = (char *)value;
3523 +
3524 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
3525 + mutex_lock(&hidden_dentry->d_inode->i_mutex);
3526 +#else
3527 + down(&hidden_dentry->d_inode->i_sem);
3528 +#endif
3529 + /* lock_kernel() already done by caller. */
3530 + err = hidden_dentry->d_inode->i_op->setxattr(hidden_dentry, encoded_name, encoded_value, size, flags);
3531 + /* unlock_kernel() will be done by caller. */
3532 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
3533 + mutex_unlock(&hidden_dentry->d_inode->i_mutex);
3534 +#else
3535 + up(&hidden_dentry->d_inode->i_sem);
3536 +#endif
3537 + }
3538 + return err;
3539 +}
3540 +
3541 +/* BKL held by caller.
3542 + * dentry->d_inode->i_sem down
3543 + */
3544 +STATIC int
3545 +mini_fo_removexattr(struct dentry *dentry, const char *name) {
3546 + struct dentry *hidden_dentry = NULL;
3547 + int err = -EOPNOTSUPP;
3548 + char *encoded_name;
3549 +
3550 + check_mini_fo_dentry(dentry);
3551 +
3552 + if(exists_in_storage(dentry))
3553 + hidden_dentry = dtohd2(dentry);
3554 + else
3555 + hidden_dentry = dtohd(dentry);
3556 +
3557 + ASSERT(hidden_dentry);
3558 + ASSERT(hidden_dentry->d_inode);
3559 + ASSERT(hidden_dentry->d_inode->i_op);
3560 +
3561 + if (hidden_dentry->d_inode->i_op->removexattr) {
3562 + encoded_name = (char *)name;
3563 +
3564 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
3565 + mutex_lock(&hidden_dentry->d_inode->i_mutex);
3566 +#else
3567 + down(&hidden_dentry->d_inode->i_sem);
3568 +#endif
3569 + /* lock_kernel() already done by caller. */
3570 + err = hidden_dentry->d_inode->i_op->removexattr(hidden_dentry, encoded_name);
3571 + /* unlock_kernel() will be done by caller. */
3572 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
3573 + mutex_unlock(&hidden_dentry->d_inode->i_mutex);
3574 +#else
3575 + up(&hidden_dentry->d_inode->i_sem);
3576 +#endif
3577 + }
3578 + return err;
3579 +}
3580 +
3581 +/* BKL held by caller.
3582 + * dentry->d_inode->i_sem down
3583 + */
3584 +STATIC int
3585 +mini_fo_listxattr(struct dentry *dentry, char *list, size_t size) {
3586 + struct dentry *hidden_dentry = NULL;
3587 + int err = -EOPNOTSUPP;
3588 + char *encoded_list = NULL;
3589 +
3590 + check_mini_fo_dentry(dentry);
3591 +
3592 + if(exists_in_storage(dentry))
3593 + hidden_dentry = dtohd2(dentry);
3594 + else
3595 + hidden_dentry = dtohd(dentry);
3596 +
3597 + ASSERT(hidden_dentry);
3598 + ASSERT(hidden_dentry->d_inode);
3599 + ASSERT(hidden_dentry->d_inode->i_op);
3600 +
3601 + if (hidden_dentry->d_inode->i_op->listxattr) {
3602 + encoded_list = list;
3603 +
3604 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
3605 + mutex_lock(&hidden_dentry->d_inode->i_mutex);
3606 +#else
3607 + down(&hidden_dentry->d_inode->i_sem);
3608 +#endif
3609 + /* lock_kernel() already done by caller. */
3610 + err = hidden_dentry->d_inode->i_op->listxattr(hidden_dentry, encoded_list, size);
3611 + /* unlock_kernel() will be done by caller. */
3612 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
3613 + mutex_unlock(&hidden_dentry->d_inode->i_mutex);
3614 +#else
3615 + up(&hidden_dentry->d_inode->i_sem);
3616 +#endif
3617 + }
3618 + return err;
3619 +}
3620 +# endif /* defined(XATTR) && (LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,20)) */
3621 +
3622 +struct inode_operations mini_fo_symlink_iops =
3623 + {
3624 + readlink: mini_fo_readlink,
3625 + follow_link: mini_fo_follow_link,
3626 + /* mk: permission: mini_fo_permission, */
3627 +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
3628 + revalidate: mini_fo_inode_revalidate,
3629 +#endif
3630 + setattr: mini_fo_setattr,
3631 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
3632 + getattr: mini_fo_getattr,
3633 + put_link: mini_fo_put_link,
3634 +#endif
3635 +
3636 +#if defined(XATTR) && (LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,20))
3637 + setxattr: mini_fo_setxattr,
3638 + getxattr: mini_fo_getxattr,
3639 + listxattr: mini_fo_listxattr,
3640 + removexattr: mini_fo_removexattr
3641 +# endif /* defined(XATTR) && (LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,20)) */
3642 + };
3643 +