[rb532] remove 2.6.27 we did not use it and went to 2.6.28 directly
[openwrt/svn-archive/archive.git] / target / linux / generic-2.6 / patches-2.6.24 / 209-mini_fo.patch
1 --- a/fs/Kconfig
2 +++ b/fs/Kconfig
3 @@ -468,6 +468,9 @@ config OCFS2_DEBUG_FS
4 this option for debugging only as it is likely to decrease
5 performance of the filesystem.
6
7 +config MINI_FO
8 + tristate "Mini fanout overlay filesystem"
9 +
10 config MINIX_FS
11 tristate "Minix fs support"
12 help
13 --- a/fs/Makefile
14 +++ b/fs/Makefile
15 @@ -76,6 +76,7 @@ obj-$(CONFIG_SQUASHFS) += squashfs/
16 obj-y += ramfs/
17 obj-$(CONFIG_HUGETLBFS) += hugetlbfs/
18 obj-$(CONFIG_CODA_FS) += coda/
19 +obj-$(CONFIG_MINI_FO) += mini_fo/
20 obj-$(CONFIG_MINIX_FS) += minix/
21 obj-$(CONFIG_FAT_FS) += fat/
22 obj-$(CONFIG_MSDOS_FS) += msdos/
23 --- /dev/null
24 +++ b/fs/mini_fo/aux.c
25 @@ -0,0 +1,577 @@
26 +/*
27 + * Copyright (c) 1997-2003 Erez Zadok
28 + * Copyright (c) 2001-2003 Stony Brook University
29 + *
30 + * For specific licensing information, see the COPYING file distributed with
31 + * this package, or get one from ftp://ftp.filesystems.org/pub/fist/COPYING.
32 + *
33 + * This Copyright notice must be kept intact and distributed with all
34 + * fistgen sources INCLUDING sources generated by fistgen.
35 + */
36 +/*
37 + * Copyright (C) 2004, 2005 Markus Klotzbuecher <mk@creamnet.de>
38 + *
39 + * This program is free software; you can redistribute it and/or
40 + * modify it under the terms of the GNU General Public License
41 + * as published by the Free Software Foundation; either version
42 + * 2 of the License, or (at your option) any later version.
43 + */
44 +/*
45 + * $Id$
46 + */
47 +
48 +#ifdef HAVE_CONFIG_H
49 +# include <config.h>
50 +#endif
51 +
52 +#include "fist.h"
53 +#include "mini_fo.h"
54 +
55 +/* check if file exists in storage */
56 +int exists_in_storage(dentry_t *dentry)
57 +{
58 + check_mini_fo_dentry(dentry);
59 + if(dtost(dentry) == MODIFIED || dtost(dentry) == CREATED || dtost(dentry) == DEL_REWRITTEN)
60 + return 1;
61 + return 0;
62 +}
63 +
64 +/* check if dentry is in an existing state */
65 +int is_mini_fo_existant(dentry_t *dentry)
66 +{
67 + check_mini_fo_dentry(dentry);
68 +
69 + if(dtost(dentry) == DELETED || dtost(dentry) == NON_EXISTANT)
70 + return 0;
71 + else
72 + return 1;
73 +}
74 +
75 +/*
76 + * This function will create a negative storage dentry for
77 + * dentry, what is required for many create like options.
78 + * It will create the storage structure if necessary.
79 + */
80 +int get_neg_sto_dentry(dentry_t *dentry)
81 +{
82 + int err = 0;
83 + unsigned int len;
84 + const unsigned char *name;
85 +
86 + if(!dentry ||
87 + !dtopd(dentry) ||
88 + !(dtost(dentry) == UNMODIFIED ||
89 + dtost(dentry) == NON_EXISTANT ||
90 + dtost(dentry) == DELETED)) {
91 + printk(KERN_CRIT "mini_fo: get_neg_sto_dentry: invalid dentry passed.\n");
92 + err = -1;
93 + goto out;
94 + }
95 + /* Have we got a neg. dentry already? */
96 + if(dtohd2(dentry)) {
97 + err = 0;
98 + goto out;
99 + }
100 + if(dtost(dentry->d_parent) == UNMODIFIED) {
101 + /* build sto struct */
102 + err = build_sto_structure(dentry->d_parent->d_parent, dentry->d_parent);
103 + if(err ||
104 + dtost(dentry->d_parent) != MODIFIED) {
105 + printk(KERN_CRIT "mini_fo: get_neg_sto_dentry: ERROR building sto structure.\n");
106 + err = -1;
107 + goto out;
108 + }
109 + }
110 +
111 + len = dentry->d_name.len;
112 + name = dentry->d_name.name;
113 +
114 + dtohd2(dentry) =
115 + lookup_one_len(name, dtohd2(dentry->d_parent), len);
116 +
117 + out:
118 + return err;
119 +}
120 +
121 +int check_mini_fo_dentry(dentry_t *dentry)
122 +{
123 + ASSERT(dentry != NULL);
124 + ASSERT(dtopd(dentry) != NULL);
125 + ASSERT((dtohd(dentry) != NULL) || (dtohd2(dentry) != NULL));
126 +
127 +/* if(dtost(dentry) == MODIFIED) { */
128 +/* ASSERT(dentry->d_inode != NULL); */
129 +/* ASSERT(dtohd(dentry) != NULL); */
130 +/* ASSERT(dtohd(dentry)->d_inode != NULL); */
131 +/* ASSERT(dtohd2(dentry) != NULL); */
132 +/* ASSERT(dtohd2(dentry)->d_inode != NULL); */
133 +/* } */
134 +/* else if(dtost(dentry) == UNMODIFIED) { */
135 +/* ASSERT(dentry->d_inode != NULL); */
136 +/* ASSERT( */
137 +/* } */
138 + return 0;
139 +}
140 +
141 +int check_mini_fo_file(file_t *file)
142 +{
143 + ASSERT(file != NULL);
144 + ASSERT(ftopd(file) != NULL);
145 + ASSERT(file->f_dentry != NULL);
146 +
147 + /* violent checking, check depending of state and type
148 + * if(S_ISDIR(file->f_dentry->d_inode->i_mode)) {}
149 + */
150 + ASSERT((ftohf(file) != NULL) || (ftohf2(file) != NULL));
151 + return 0;
152 +}
153 +
154 +int check_mini_fo_inode(inode_t *inode)
155 +{
156 + ASSERT(inode != NULL);
157 + ASSERT(itopd(inode) != NULL);
158 + ASSERT((itohi(inode) != NULL) || (itohi2(inode) != NULL));
159 + return 0;
160 +}
161 +
162 +/*
163 + * will walk a base path as provided by get_mini_fo_bpath and return
164 + * the (hopefully ;-) ) positive dentry of the renamed base dir.
165 + *
166 + * This does some work of path_init.
167 + */
168 +dentry_t *bpath_walk(super_block_t *sb, char *bpath)
169 +{
170 + int err;
171 + struct vfsmount *mnt;
172 + struct nameidata nd;
173 +
174 + /* be paranoid */
175 + if(!bpath || bpath[0] != '/') {
176 + printk(KERN_CRIT "mini_fo: bpath_walk: Invalid string.\n");
177 + return NULL;
178 + }
179 + if(!sb || !stopd(sb)) {
180 + printk(KERN_CRIT "mini_fo: bpath_walk: Invalid sb.\n");
181 + return NULL;
182 + }
183 +
184 + /* fix this: how do I reach this lock?
185 + * read_lock(&current->fs->lock); */
186 + mnt = mntget(stopd(sb)->hidden_mnt);
187 + /* read_unlock(&current->fs->lock); */
188 +
189 + err = vfs_path_lookup(mnt->mnt_root, mnt, bpath+1, 0, &nd);
190 +
191 + /* validate */
192 + if (err || !nd.dentry || !nd.dentry->d_inode) {
193 + printk(KERN_CRIT "mini_fo: bpath_walk: path_walk failed.\n");
194 + return NULL;
195 + }
196 + return nd.dentry;
197 +}
198 +
199 +
200 +/* returns the full path of the basefile incl. its name */
201 +int get_mini_fo_bpath(dentry_t *dentry, char **bpath, int *bpath_len)
202 +{
203 + char *buf_walker;
204 + int len = 0;
205 + dentry_t *sky_walker;
206 +
207 + if(!dentry || !dtohd(dentry)) {
208 + printk(KERN_CRIT "mini_fo: get_mini_fo_bpath: invalid dentry passed.\n");
209 + return -1;
210 + }
211 + sky_walker = dtohd(dentry);
212 +
213 + do {
214 + len += sky_walker->d_name.len + 1 ; /* 1 for '/' */
215 + sky_walker = sky_walker->d_parent;
216 + } while(sky_walker != stopd(dentry->d_inode->i_sb)->base_dir_dentry);
217 +
218 + /* 1 to oil the loop */
219 + *bpath = (char*) kmalloc(len + 1, GFP_KERNEL);
220 + if(!*bpath) {
221 + printk(KERN_CRIT "mini_fo: get_mini_fo_bpath: out of mem.\n");
222 + return -1;
223 + }
224 + buf_walker = *bpath+len; /* put it on last char */
225 + *buf_walker = '\n';
226 + sky_walker = dtohd(dentry);
227 +
228 + do {
229 + buf_walker -= sky_walker->d_name.len;
230 + strncpy(buf_walker,
231 + sky_walker->d_name.name,
232 + sky_walker->d_name.len);
233 + *(--buf_walker) = '/';
234 + sky_walker = sky_walker->d_parent;
235 + } while(sky_walker != stopd(dentry->d_inode->i_sb)->base_dir_dentry);
236 +
237 + /* bpath_len doesn't count newline! */
238 + *bpath_len = len;
239 + return 0;
240 +}
241 +
242 +int mini_fo_cp_cont(dentry_t *tgt_dentry, struct vfsmount *tgt_mnt,
243 + dentry_t *src_dentry, struct vfsmount *src_mnt)
244 +{
245 + void *buf;
246 + mm_segment_t old_fs;
247 + file_t *tgt_file;
248 + file_t *src_file;
249 + int bytes, len, tmp, err;
250 + err = 0;
251 +
252 + if(!(tgt_dentry->d_inode && src_dentry->d_inode)) {
253 + printk(KERN_CRIT "mini_fo_cp_cont: ERROR, neg. dentry passed.\n");
254 + err = -EINVAL;
255 + goto out;
256 + }
257 +
258 + dget(tgt_dentry);
259 + dget(src_dentry);
260 + mntget(tgt_mnt);
261 + mntget(src_mnt);
262 +
263 + /* open file write only */
264 + tgt_file = dentry_open(tgt_dentry, tgt_mnt, 0x1);
265 + if(!tgt_file || IS_ERR(tgt_file)) {
266 + printk(KERN_CRIT "mini_fo_cp_cont: ERROR opening target file.\n");
267 + err = PTR_ERR(tgt_file);
268 + goto out_err;
269 + }
270 +
271 + /* open file read only */
272 + src_file = dentry_open(src_dentry, src_mnt, 0x0);
273 + if(!src_file || IS_ERR(src_file)) {
274 + printk(KERN_CRIT "mini_fo_cp_cont: ERROR opening source file.\n");
275 + err = PTR_ERR(src_file);
276 +
277 + /* close target file */
278 + fput(tgt_file);
279 + goto out_err;
280 + }
281 +
282 + /* check if the filesystem(s) support read respective write */
283 + if(!src_file->f_op->read || !tgt_file->f_op->write) {
284 + printk(KERN_CRIT "mini_fo_cp_cont: ERROR, no fs read or write support.\n");
285 + err = -EPERM;
286 + goto out_close;
287 + }
288 +
289 + /* allocate a page for transfering the data */
290 + buf = (void *) __get_free_page(GFP_KERNEL);
291 + if(!buf) {
292 + printk(KERN_CRIT "mini_fo_cp_cont: ERROR, out of kernel mem.\n");
293 + goto out_err;
294 + }
295 +
296 + tgt_file->f_pos = 0;
297 + src_file->f_pos = 0;
298 +
299 + old_fs = get_fs();
300 + set_fs(KERNEL_DS);
301 +
302 + /* Doing this I assume that a read operation will return a full
303 + * buffer while there is still data to read, and a less than
304 + * full buffer when all data has been read.
305 + */
306 + bytes = len = PAGE_SIZE;
307 + while(bytes == len) {
308 + bytes = src_file->f_op->read(src_file, buf, len,
309 + &src_file->f_pos);
310 + tmp = tgt_file->f_op->write(tgt_file, buf, bytes,
311 + &tgt_file->f_pos);
312 + if(tmp != bytes) {
313 + printk(KERN_CRIT "mini_fo_cp_cont: ERROR writing.\n");
314 + goto out_close_unset;
315 + }
316 + }
317 +
318 + free_page((unsigned long) buf);
319 + set_fs(old_fs);
320 + fput(tgt_file);
321 + fput(src_file);
322 + goto out;
323 +
324 + out_close_unset:
325 + free_page((unsigned long) buf);
326 + set_fs(old_fs);
327 +
328 + out_close:
329 + fput(tgt_file);
330 + fput(src_file);
331 +
332 + out_err:
333 + dput(tgt_dentry);
334 + dput(src_dentry);
335 +
336 + /* mk: not sure if this need to be done */
337 + mntput(tgt_mnt);
338 + mntput(src_mnt);
339 +
340 + out:
341 + return err;
342 +}
343 +
344 +/* mk:
345 + * ndl (no-duplicate list) stuff
346 + * This is used in mini_fo_readdir, to save the storage directory contents
347 + * and later when reading base, match them against the list in order
348 + * to avoid duplicates.
349 + */
350 +
351 +/* add a file specified by name and len to the ndl
352 + * Return values: 0 on success, <0 on failure.
353 + */
354 +int ndl_add_entry(struct readdir_data *rd, const char *name, int len)
355 +{
356 + struct ndl_entry *tmp_entry;
357 +
358 + tmp_entry = (struct ndl_entry *)
359 + kmalloc(sizeof(struct ndl_entry), GFP_KERNEL);
360 + if(!tmp_entry) {
361 + printk(KERN_CRIT "mini_fo: ndl_add_entry: out of mem.\n");
362 + return -ENOMEM;
363 + }
364 + tmp_entry->name = (char*) kmalloc(len, GFP_KERNEL);
365 + if(!tmp_entry->name) {
366 + printk(KERN_CRIT "mini_fo: ndl_add_entry: out of mem.\n");
367 + return -ENOMEM;
368 + }
369 + strncpy(tmp_entry->name, name, len);
370 + tmp_entry->len = len;
371 +
372 + list_add(&tmp_entry->list, &rd->ndl_list);
373 + rd->ndl_size++;
374 + return 0;
375 +}
376 +
377 +/* delete all list entries and free memory */
378 +void ndl_put_list(struct readdir_data *rd)
379 +{
380 + struct list_head *tmp;
381 + struct ndl_entry *tmp_entry;
382 +
383 + if(rd->ndl_size <= 0)
384 + return;
385 + while(!list_empty(&rd->ndl_list)) {
386 + tmp = rd->ndl_list.next;
387 + list_del(tmp);
388 + tmp_entry = list_entry(tmp, struct ndl_entry, list);
389 + kfree(tmp_entry->name);
390 + kfree(tmp_entry);
391 + }
392 + rd->ndl_size = 0;
393 +}
394 +
395 +/* Check if a file specified by name and len is in the ndl
396 + * Return value: 0 if not in list, 1 if file is found in ndl.
397 + */
398 +int ndl_check_entry(struct readdir_data *rd, const char *name, int len)
399 +{
400 + struct list_head *tmp;
401 + struct ndl_entry *tmp_entry;
402 +
403 + if(rd->ndl_size <= 0)
404 + return 0;
405 +
406 + list_for_each(tmp, &rd->ndl_list) {
407 + tmp_entry = list_entry(tmp, struct ndl_entry, list);
408 + if(tmp_entry->len != len)
409 + continue;
410 + if(!strncmp(tmp_entry->name, name, len))
411 + return 1;
412 + }
413 + return 0;
414 +}
415 +
416 +/* mk:
417 + * Recursive function to create corresponding directorys in the storage fs.
418 + * The function will build the storage directorys up to dentry.
419 + */
420 +int build_sto_structure(dentry_t *dir, dentry_t *dentry)
421 +{
422 + int err;
423 + dentry_t *hidden_sto_dentry;
424 + dentry_t *hidden_sto_dir_dentry;
425 +
426 + if(dentry->d_parent != dir) {
427 + printk(KERN_CRIT "mini_fo: build_sto_structure: invalid parameter or meta data corruption [1].\n");
428 + return 1;
429 + }
430 +
431 + if(dtost(dir) != MODIFIED) {
432 + err = build_sto_structure(dir->d_parent, dentry->d_parent);
433 + if(err)
434 + return err;
435 + }
436 +
437 + /* ok, coming back again. */
438 + check_mini_fo_dentry(dentry);
439 + hidden_sto_dentry = dtohd2(dentry);
440 +
441 + if(!hidden_sto_dentry) {
442 + /*
443 + * This is the case after creating the first
444 + * hidden_sto_dentry.
445 + * After one negative storage_dentry, all pointers to
446 + * hidden_storage dentries are set to NULL. We need to
447 + * create the negative dentry before we create the storage
448 + * file.
449 + */
450 + unsigned int len;
451 + const unsigned char *name;
452 + len = dtohd(dentry)->d_name.len;
453 + name = dtohd(dentry)->d_name.name;
454 + hidden_sto_dentry = lookup_one_len(name, dtohd2(dir), len);
455 + dtohd2(dentry) = hidden_sto_dentry;
456 + }
457 +
458 + /* was: hidden_sto_dir_dentry = lock_parent(hidden_sto_dentry); */
459 + hidden_sto_dir_dentry = dget(hidden_sto_dentry->d_parent);
460 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
461 + mutex_lock(&hidden_sto_dir_dentry->d_inode->i_mutex);
462 +#else
463 + down(&hidden_sto_dir_dentry->d_inode->i_sem);
464 +#endif
465 + /* lets be safe */
466 + if(dtohd2(dir) != hidden_sto_dir_dentry) {
467 + printk(KERN_CRIT "mini_fo: build_sto_structure: invalid parameter or meta data corruption [2].\n");
468 + return 1;
469 + }
470 +
471 + /* check for errors in lock_parent */
472 + err = PTR_ERR(hidden_sto_dir_dentry);
473 + if(IS_ERR(hidden_sto_dir_dentry)) {
474 + printk(KERN_CRIT "mini_fo: build_sto_structure: lock_parent failed.\n");
475 + return err;
476 + }
477 +
478 + err = vfs_mkdir(hidden_sto_dir_dentry->d_inode,
479 + hidden_sto_dentry,
480 + dir->d_inode->i_mode);
481 +
482 + if(err) {
483 + printk(KERN_CRIT "mini_fo: build_sto_structure: failed to create storage dir [1].\n");
484 + /* was: unlock_dir(dir); */
485 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
486 + mutex_unlock(&dir->d_inode->i_mutex);
487 +#else
488 + up(&dir->d_inode->i_sem);
489 +#endif
490 + dput(dir);
491 + return err;
492 + }
493 +
494 + /* everything ok! */
495 + if(!dtohd2(dentry)->d_inode) {
496 + printk(KERN_CRIT "mini_fo: build_sto_structure: failed to create storage dir [2].\n");
497 + /* was: unlock_dir(dir); */
498 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
499 + mutex_unlock(&dir->d_inode->i_mutex);
500 +#else
501 + up(&dir->d_inode->i_sem);
502 +#endif
503 + dput(dir);
504 + return 1;
505 + }
506 +
507 + /* interpose the new inode and set new state */
508 + itohi2(dentry->d_inode) = igrab(dtohd2(dentry)->d_inode);
509 + dtopd(dentry)->state = MODIFIED;
510 +
511 + /* initalize the wol list */
512 + itopd(dentry->d_inode)->deleted_list_size = -1;
513 + itopd(dentry->d_inode)->renamed_list_size = -1;
514 + meta_build_lists(dentry);
515 +
516 + fist_copy_attr_all(dentry->d_inode, itohi2(dentry->d_inode));
517 + fist_copy_attr_timesizes(dir->d_inode,
518 + hidden_sto_dir_dentry->d_inode);
519 + dir->d_inode->i_nlink++;
520 + /* was: unlock_dir(hidden_sto_dir_dentry); */
521 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
522 + mutex_unlock(&hidden_sto_dir_dentry->d_inode->i_mutex);
523 +#else
524 + up(&hidden_sto_dir_dentry->d_inode->i_sem);
525 +#endif
526 + dput(hidden_sto_dir_dentry);
527 + return 0;
528 +}
529 +
530 +
531 +#if 0 /* unused */
532 +
533 +/*
534 + * Read "len" bytes from "filename" into "buf".
535 + * "buf" is in kernel space.
536 + */
537 +int
538 +mini_fo_read_file(const char *filename, void *buf, int len)
539 +{
540 + file_t *filp;
541 + mm_segment_t oldfs;
542 + int bytes;
543 + /* Chroot? Maybe NULL isn't right here */
544 + filp = filp_open(filename, O_RDONLY, 0);
545 + if (!filp || IS_ERR(filp)) {
546 + printk("mini_fo_read_file err %d\n", (int) PTR_ERR(filp));
547 + return -1; /* or do something else */
548 + }
549 +
550 + if (!filp->f_op->read)
551 + return -2; /* file(system) doesn't allow reads */
552 +
553 + /* now read len bytes from offset 0 */
554 + filp->f_pos = 0; /* start offset */
555 + oldfs = get_fs();
556 + set_fs(KERNEL_DS);
557 + bytes = filp->f_op->read(filp, buf, len, &filp->f_pos);
558 + set_fs(oldfs);
559 +
560 + /* close the file */
561 + fput(filp);
562 +
563 + return bytes;
564 +}
565 +
566 +
567 +
568 +/*
569 + * Write "len" bytes from "buf" to "filename"
570 + * "buf" is in kernel space.
571 + */
572 +int
573 +mini_fo_write_file(const char *filename, void *buf, int len)
574 +{
575 + file_t *filp;
576 + mm_segment_t oldfs;
577 + int bytes;
578 + /* Chroot? Maybe NULL isn't right here */
579 + filp = filp_open(filename, O_RDWR|O_CREAT, 0640);
580 + if (!filp || IS_ERR(filp)) {
581 + printk("mini_fo_write_file err %d\n", (int) PTR_ERR(filp));
582 + return -1; /* or do something else */
583 + }
584 +
585 + if (!filp->f_op->write)
586 + return -2; /* file(system) doesn't allow writes */
587 +
588 + /* now write len bytes from offset 0 */
589 + filp->f_pos = 0; /* start offset */
590 + oldfs = get_fs();
591 + set_fs(KERNEL_DS);
592 + bytes = filp->f_op->write(filp, buf, len, &filp->f_pos);
593 + set_fs(oldfs);
594 +
595 + /* close the file */
596 + fput(filp);
597 +
598 + return bytes;
599 +}
600 +
601 +#endif /* unused */
602 +
603 --- /dev/null
604 +++ b/fs/mini_fo/ChangeLog
605 @@ -0,0 +1,281 @@
606 +2006-01-24 Markus Klotzbuecher <mk@mary.denx.de>
607 +
608 + * Add tons of ugly ifdefs to Ed L. Cashin's mutex patch to
609 + retain backwards compatibility.
610 +
611 +2006-01-24 Ed L. Cashin <ecashin@coraid.com>
612 +
613 + * Support for the new mutex infrastructure
614 + (7892f2f48d165a34b0b8130c8a195dfd807b8cb6)
615 +
616 +2005-10-15 Markus Klotzbuecher <mk@localhost.localdomain>
617 +
618 + * Bugfix for a serious memory leak in mini_fo_follow_link.
619 +
620 +2005-09-21 Markus Klotzbuecher <mk@mary>
621 +
622 + * new release 0.6.1
623 +
624 + * fix of a compiler warning due to changes in 2.6.13
625 +
626 +2005-09-21 Klaus Wenninger <klaus.wenninger@siemens.com>
627 +
628 + * file.c: readdir: fix for a bug that caused directory entries
629 + to show up twice when using storage filesystems such as
630 + minixfs or pramfs.
631 +
632 +2005-06-30 Eric Lammerts <eric@lammerts.org>
633 +
634 + * fix for an oops when overwriting a binary thats beeing
635 + executed.
636 +
637 +2005-06-09 <mk@mary>
638 +
639 + * Renamed overlay to mini_fo-overlay.
640 +
641 + * Added mini_fo-merge script to allow merging of storage and base
642 + after making modifications.
643 +
644 +2005-05-22 root <mk@mary>
645 +
646 + * Added overlay script that allows to easily mount mini_fo ontop
647 + of a given base directory
648 +
649 +2005-05-10 <mk@mary>
650 +
651 + * inode.c: xattr functions return -EOPNOSUPP instead of
652 + -ENOSUPP, what confuses "ls -l"
653 +
654 + * Changed license from LGPL to GPL.
655 +
656 +2005-05-08 root <mk@mary>
657 +
658 + * Makefile: clean it up and added make install and make
659 + uninstall.
660 +
661 +2005-05-06 <mk@mary>
662 +
663 + * merged devel branch back to main. [v0-6-0-pre3]
664 +
665 + * removed unused files print.c and fist_ioctl. [devel-0-0-18]
666 +
667 + * ioctl: removed fist_ioctl stuff, that is not needed for
668 + now.
669 +
670 +2005-05-03 <mk@mary>
671 +
672 + * file.c: simplified mini_fo_open and mini_fo_setattr using
673 + new state changing functions. [devel-0-0-17]
674 +
675 + * inode.c: Fixed getattr state bug (see below) in 2.4 function
676 + mini_fo_inode revalidate.
677 +
678 + * inode.c: found an other bug in mini_fo_getattr. States are not
679 + reliable in this function, as a file can be opened, unlinked and
680 + the getattr function called. This results in a deleted dentry
681 + with an inode. Fix is to ignore states and simply use the inode
682 + available.
683 +
684 +2005-04-29 <mk@mary>
685 +
686 + * file.c: Bugfix and cleanup in fasync and fsync. [devel-0-0-16]
687 +
688 + * file.c: do not use mini_fo_lock so the generic version is
689 + used (I guess).
690 +
691 + * inode.c: getattr, never call getattr on lower files, as this
692 + will cause the inum to change.
693 +
694 + * inode.c: rename_reg_file renamed to rename_nondir, as it
695 + doesn't matter as long it't not a dir. Removed all
696 + rename_dev_file etc.
697 +
698 + * tagged as devel-0-0-15
699 +
700 + * inode.c: added support for chosing support for extended
701 + attrs at compile time by XATTR define in mini_fo.h .
702 +
703 + * inode.c: fixed mini_fo_getattr to use mini_fo inode and not
704 + lower again, what avoids inode number changes that confused
705 + rm again. This is the proper solution.
706 +
707 +2005-04-24 <mk@mary>
708 +
709 + * all files: updated Copyright notive to 2005. [devel-0-0-14]
710 +
711 + * inode.c: fixed mini_fo_getattr to not change the inode
712 + number, even if lower files change.
713 +
714 + * super.c: fixed a bug that caused deleted base file to show
715 + up suddenly after some time, or after creating a special
716 + file. The problem was that after some time or after special
717 + file creating sync_sb_inodes is called by the vfs, that
718 + called our mini_fo_put_inode. There was (wrongly) called
719 + __meta_put_lists, that nuked the lists, although the inode
720 + was going to continue its life. Moving __meta_put_lists to
721 + mini_fo_clear_inode, where an inode is really destroyed,
722 + solved the problem.
723 +
724 +
725 +2005-04-23 <mk@mary>
726 +
727 + * state.c, aux.c: more cleaning up and
728 + simplifications. [devel-0-0-13]
729 +
730 + * inode.c: implemented mini_fo_getattr, that was required for
731 + 2.6 because inode_revalidate has been remove there, and the
732 + old "du" bug returned.
733 +
734 +
735 +2005-04-20 <mk@mary>
736 +
737 + * aux.c: get_neg_sto_dentry(): allow to be called for dentries
738 + in state UNMODIFIED, NON_EXISTANT _and_ DELETED.
739 +
740 +2005-04-19 <mk@mary>
741 +
742 + * Fixed a bug under 2.6 that caused files deleted via mini_fo
743 + not to be deleted properly and therefore the fs filled up
744 + untill no memory was left. [devel-0-0-12]
745 +
746 + * Added basic hard link support. This means that creating
747 + hardlinks will work, but existing ones will be treated as
748 + individual files. [devel-0-0-11]
749 +
750 +2005-04-17 <mk@mary>
751 +
752 + * Bugfixes
753 +
754 +2005-04-13 root <mk@mary>
755 +
756 + * Added file state.c for the state transition
757 + functions. Doesn't work very well yet, though...
758 +
759 +2005-04-12 <mk@mary>
760 +
761 + * Porting to 2.6 started, which is easier than expected, also
762 + due to Olivier previous work.
763 +
764 +2005-04-08 <mk@mary>
765 +
766 + * Fixed the bug that caused du to return invalid sizes of
767 + directory trees. The problem was that
768 + mini_fo_inode_revalidate didn't always copy the attributes
769 + from the base inode properly.
770 +
771 +2005-04-01 Markus Klotzbuecher <mk@chasey>
772 +
773 + * Merged devel branch back to main trunk and updated the
774 + RELEASE notes. This will be 0-6-0-pre1.
775 +
776 +2005-03-31 Markus Klotzbuecher <mk@chasey>
777 +
778 + * Fixed some bugs in rename_reg_file, that only showed up in
779 + the kernel compile test. Kernel compiles cleanly ontop of
780 + mini_fo, now also make mrproper etc. work. Seems pretty stable.
781 +
782 +2005-03-28 Markus Klotzbuecher <mk@chasey>
783 +
784 + * Many, many directory renaming bugfixes and a lot of other
785 + cleanup. Dir renaming seems to work relatively stable.
786 +
787 +2005-03-22 Markus Klotzbuecher <mk@chasey>
788 +
789 + * Finished implementing lightweight directory renaming. Some
790 + basic testing indicates it works fine.
791 + Next is to implement testcases for the testsuite and confirm
792 + everything is really working ok.
793 +
794 +2005-03-18 Markus Klotzbuecher <mk@chasey>
795 +
796 + * Finished implementing meta.c stuff required for directory
797 + renaming.
798 +
799 +2005-03-17 Markus Klotzbuecher <mk@chasey>
800 +
801 + * Fixed all compile warnings + an extremly old bug that
802 + somehow crept in while reworking the wol stuff to the META
803 + system. Turning on -Werror again... :-)
804 +
805 + * Fixed some bugs in the new rename_reg_file function.
806 +
807 + * Rewrote mini_fo rename and split it into several
808 + subfunctions, that handle the different types
809 + seperately. Rewrote the regular file function aswell, as it
810 + was implemented somewhat inefficient.
811 +
812 +2005-03-16 Markus Klotzbuecher <mk@chasey>
813 +
814 + * Implemented new META subsystem, removed old WOL stuff in favor
815 + if it.
816 +
817 + * After some basic testing everything seems ok...
818 +
819 +2005-03-11 Markus Klotzbuecher <mk@chasey>
820 +
821 + * Renaming a non regular file caused trouble because I always
822 + tried to copy the contents. Now I only do this for regular
823 + files. mini_fo_rename still isn't implemented properly, renaming
824 + of device files, symlinks etc. results in a empty regular file
825 + instead of the proper type.
826 +
827 + * Directory renaming suddenly works! What a surprise! I guess
828 + this is because renaming is implemented as making a copy and
829 + removing the original. Still this might not work
830 + everywhere...
831 +
832 +2005-03-09 Markus Klotzbuecher <mk@chasey>
833 +
834 + * Bugfix, when a mini_fo directory that exists in storage
835 + (state: MODIFIED, CREATED and DEL_REWRITTEN) is deleted, a
836 + possibly existing WOL file contained in it needs to be
837 + deleted too.
838 +
839 + * Starting cleanup: defined state names in order to get rid of
840 + the state numbers.
841 +
842 +2005-03-08 Markus Klotzbuecher <mk@chasey>
843 +
844 + * Makefile fix, fist_ioctl was built against wrong sources if ARCH=um
845 +
846 + * Fixed a bug in dentry.c, mini_fo_d_hash. In state 4 =
847 + DEL_REWRITTEN the hash was calculated from the base dentry,
848 + which was wrong and and caused assertions in
849 + __mini_fo_hidden_dentry to fail.
850 +
851 +2005-02-21 <mk@mary>
852 +
853 + * Implemented directory deleting (inode.c)
854 +
855 + * main.c: made mini_fo_parse_options a little more robust.
856 +
857 +2004-12-22 <mk@mary>
858 +
859 + * Makefile cleanup and uml stuff, removed unneccessary files
860 +
861 + * Created a new and hopefully more informative README
862 +
863 + * CHANGELOG: created a new CHANGELOG and added old entries reversely
864 +
865 +
866 +2004-10-24 Gleb Natapov <gleb@nbase.co.il>
867 +
868 + * Fix: owner and group where not correctly copied from base to
869 + storage.
870 +
871 +
872 +2004-10-05 Gleb Natapov <gleb@nbase.co.il>
873 +
874 + * Implementation of fsync, fasync and lock mini_fo functions.
875 +
876 +
877 +2004-09-29 Bob Lee <bob@pantasys.com>
878 +
879 + * Fix of a serious pointer bug
880 +
881 +
882 +2004-09-28 Gleb Natapov <gleb@nbase.co.il>
883 +
884 + * Implementation of mini_fo_mknod and mini_fo_rename, support
885 + for device files.
886 +
887 --- /dev/null
888 +++ b/fs/mini_fo/dentry.c
889 @@ -0,0 +1,244 @@
890 +/*
891 + * Copyright (c) 1997-2003 Erez Zadok
892 + * Copyright (c) 2001-2003 Stony Brook University
893 + *
894 + * For specific licensing information, see the COPYING file distributed with
895 + * this package, or get one from ftp://ftp.filesystems.org/pub/fist/COPYING.
896 + *
897 + * This Copyright notice must be kept intact and distributed with all
898 + * fistgen sources INCLUDING sources generated by fistgen.
899 + */
900 +/*
901 + * Copyright (C) 2004, 2005 Markus Klotzbuecher <mk@creamnet.de>
902 + *
903 + * This program is free software; you can redistribute it and/or
904 + * modify it under the terms of the GNU General Public License
905 + * as published by the Free Software Foundation; either version
906 + * 2 of the License, or (at your option) any later version.
907 + */
908 +
909 +/*
910 + * $Id$
911 + */
912 +
913 +#ifdef HAVE_CONFIG_H
914 +# include <config.h>
915 +#endif
916 +
917 +#include "fist.h"
918 +#include "mini_fo.h"
919 +
920 +/*
921 + * THIS IS A BOOLEAN FUNCTION: returns 1 if valid, 0 otherwise.
922 + */
923 +STATIC int
924 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
925 +mini_fo_d_revalidate(dentry_t *dentry, struct nameidata *nd)
926 +#else
927 +mini_fo_d_revalidate(dentry_t *dentry, int flags)
928 +#endif
929 +{
930 + int err1 = 1; /* valid = 1, invalid = 0 */
931 + int err2 = 1;
932 + dentry_t *hidden_dentry;
933 + dentry_t *hidden_sto_dentry;
934 +
935 +
936 + check_mini_fo_dentry(dentry);
937 +
938 + hidden_dentry = dtohd(dentry);
939 + hidden_sto_dentry = dtohd2(dentry);
940 +
941 + if(hidden_dentry &&
942 + hidden_dentry->d_op &&
943 + hidden_dentry->d_op->d_revalidate) {
944 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
945 + err1 = hidden_dentry->d_op->d_revalidate(hidden_dentry, nd);
946 +#else
947 + err1 = hidden_dentry->d_op->d_revalidate(hidden_dentry, flags);
948 +#endif
949 + }
950 + if(hidden_sto_dentry &&
951 + hidden_sto_dentry->d_op &&
952 + hidden_sto_dentry->d_op->d_revalidate) {
953 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
954 + err2 = hidden_sto_dentry->d_op->d_revalidate(hidden_sto_dentry,
955 + nd);
956 +#else
957 + err2 = hidden_sto_dentry->d_op->d_revalidate(hidden_sto_dentry,
958 + flags);
959 +#endif
960 + }
961 +
962 + /* mk: if one of the lower level dentries are valid,
963 + * the mini_fo dentry is too.
964 + */
965 + return (err1 || err2);
966 +}
967 +
968 +
969 +STATIC int
970 +mini_fo_d_hash(dentry_t *dentry, qstr_t *name)
971 +{
972 + int err = 0;
973 + dentry_t *hidden_dentry;
974 + dentry_t *hidden_sto_dentry;
975 +
976 + /* hidden_dentry = mini_fo_hidden_dentry(dentry);
977 + * hidden_sto_dentry = mini_fo_hidden_sto_dentry(dentry); */
978 +
979 + /* state 1, 3, 4, 5: build the hash for the storage dentry */
980 + if((dtopd(dentry)->state == MODIFIED) ||
981 + (dtopd(dentry)->state == CREATED) ||
982 + (dtopd(dentry)->state == DEL_REWRITTEN) ||
983 + (dtopd(dentry)->state == DELETED)) {
984 + hidden_sto_dentry = dtohd2(dentry);
985 + if(hidden_sto_dentry &&
986 + hidden_sto_dentry->d_op &&
987 + hidden_sto_dentry->d_op->d_hash) {
988 + err = hidden_sto_dentry->d_op->d_hash(hidden_sto_dentry, name);
989 + }
990 + goto out;
991 + }
992 + /* state 2: build the hash for the base dentry */
993 + if(dtopd(dentry)->state == UNMODIFIED) {
994 + hidden_dentry = dtohd(dentry);
995 + if(hidden_dentry &&
996 + hidden_dentry->d_op &&
997 + hidden_dentry->d_op->d_hash) {
998 + err = hidden_dentry->d_op->d_hash(hidden_dentry, name);
999 + }
1000 + goto out;
1001 + }
1002 + /* state 6: build hash for the dentry that exists */
1003 + if(dtopd(dentry)->state == NON_EXISTANT) {
1004 + hidden_sto_dentry = dtohd2(dentry);
1005 + if(hidden_sto_dentry &&
1006 + hidden_sto_dentry->d_op &&
1007 + hidden_sto_dentry->d_op->d_hash) {
1008 + err = hidden_sto_dentry->d_op->d_hash(hidden_sto_dentry, name);
1009 + goto out;
1010 + }
1011 + hidden_dentry = dtohd(dentry);
1012 + if(hidden_dentry &&
1013 + hidden_dentry->d_op &&
1014 + hidden_dentry->d_op->d_hash) {
1015 + err = hidden_dentry->d_op->d_hash(hidden_dentry, name);
1016 + goto out;
1017 + }
1018 + }
1019 +
1020 + printk(KERN_CRIT "mini_fo: d_hash: invalid state detected.\n");
1021 +
1022 + out:
1023 + return err;
1024 +}
1025 +
1026 +
1027 +STATIC int
1028 +mini_fo_d_compare(dentry_t *dentry, qstr_t *a, qstr_t *b)
1029 +{
1030 + int err;
1031 + dentry_t *hidden_dentry=NULL;
1032 +
1033 + /* hidden_dentry = mini_fo_hidden_dentry(dentry); */
1034 + if(dtohd2(dentry))
1035 + hidden_dentry = dtohd2(dentry);
1036 + else if(dtohd(dentry))
1037 + hidden_dentry = dtohd(dentry);
1038 +
1039 + if (hidden_dentry && hidden_dentry->d_op && hidden_dentry->d_op->d_compare) {
1040 + err = hidden_dentry->d_op->d_compare(hidden_dentry, a, b);
1041 + } else {
1042 + err = ((a->len != b->len) || memcmp(a->name, b->name, b->len));
1043 + }
1044 +
1045 + return err;
1046 +}
1047 +
1048 +
1049 +int
1050 +mini_fo_d_delete(dentry_t *dentry)
1051 +{
1052 + dentry_t *hidden_dentry;
1053 + dentry_t *hidden_sto_dentry;
1054 + int err = 0;
1055 +
1056 + /* this could be a negative dentry, so check first */
1057 + if (!dtopd(dentry)) {
1058 + printk(KERN_CRIT "mini_fo_d_delete: negative dentry passed.\n");
1059 + goto out;
1060 + }
1061 + hidden_dentry = dtohd(dentry);
1062 + hidden_sto_dentry = dtohd2(dentry);
1063 +
1064 + if(hidden_dentry) {
1065 + if(hidden_dentry->d_op &&
1066 + hidden_dentry->d_op->d_delete) {
1067 + err = hidden_dentry->d_op->d_delete(hidden_dentry);
1068 + }
1069 + }
1070 + if(hidden_sto_dentry) {
1071 + if(hidden_sto_dentry->d_op &&
1072 + hidden_sto_dentry->d_op->d_delete) {
1073 + err = hidden_sto_dentry->d_op->d_delete(hidden_sto_dentry);
1074 + }
1075 + }
1076 +
1077 + out:
1078 + return err;
1079 +}
1080 +
1081 +
1082 +void
1083 +mini_fo_d_release(dentry_t *dentry)
1084 +{
1085 + dentry_t *hidden_dentry;
1086 + dentry_t *hidden_sto_dentry;
1087 +
1088 +
1089 + /* this could be a negative dentry, so check first */
1090 + if (!dtopd(dentry)) {
1091 + printk(KERN_CRIT "mini_fo_d_release: no private data.\n");
1092 + goto out;
1093 + }
1094 + hidden_dentry = dtohd(dentry);
1095 + hidden_sto_dentry = dtohd2(dentry);
1096 +
1097 + if(hidden_dentry) {
1098 + /* decrement hidden dentry's counter and free its inode */
1099 + dput(hidden_dentry);
1100 + }
1101 + if(hidden_sto_dentry) {
1102 + /* decrement hidden dentry's counter and free its inode */
1103 + dput(hidden_sto_dentry);
1104 + }
1105 +
1106 + /* free private data (mini_fo_dentry_info) here */
1107 + kfree(dtopd(dentry));
1108 + __dtopd(dentry) = NULL; /* just to be safe */
1109 + out:
1110 + return;
1111 +}
1112 +
1113 +
1114 +/*
1115 + * we don't really need mini_fo_d_iput, because dentry_iput will call iput() if
1116 + * mini_fo_d_iput is not defined. We left this implemented for ease of
1117 + * tracing/debugging.
1118 + */
1119 +void
1120 +mini_fo_d_iput(dentry_t *dentry, inode_t *inode)
1121 +{
1122 + iput(inode);
1123 +}
1124 +
1125 +
1126 +struct dentry_operations mini_fo_dops = {
1127 + d_revalidate: mini_fo_d_revalidate,
1128 + d_hash: mini_fo_d_hash,
1129 + d_compare: mini_fo_d_compare,
1130 + d_release: mini_fo_d_release,
1131 + d_delete: mini_fo_d_delete,
1132 + d_iput: mini_fo_d_iput,
1133 +};
1134 --- /dev/null
1135 +++ b/fs/mini_fo/file.c
1136 @@ -0,0 +1,713 @@
1137 +/*
1138 + * Copyright (c) 1997-2003 Erez Zadok
1139 + * Copyright (c) 2001-2003 Stony Brook University
1140 + *
1141 + * For specific licensing information, see the COPYING file distributed with
1142 + * this package, or get one from ftp://ftp.filesystems.org/pub/fist/COPYING.
1143 + *
1144 + * This Copyright notice must be kept intact and distributed with all
1145 + * fistgen sources INCLUDING sources generated by fistgen.
1146 + */
1147 +/*
1148 + * Copyright (C) 2004, 2005 Markus Klotzbuecher <mk@creamnet.de>
1149 + *
1150 + * This program is free software; you can redistribute it and/or
1151 + * modify it under the terms of the GNU General Public License
1152 + * as published by the Free Software Foundation; either version
1153 + * 2 of the License, or (at your option) any later version.
1154 + */
1155 +
1156 +/*
1157 + * $Id$
1158 + */
1159 +
1160 +#ifdef HAVE_CONFIG_H
1161 +# include <config.h>
1162 +#endif
1163 +
1164 +#include "fist.h"
1165 +#include "mini_fo.h"
1166 +#define ROUND_UP(x) (((x)+sizeof(long)-1) & ~(sizeof(long)-1))
1167 +
1168 +/*******************
1169 + * File Operations *
1170 + *******************/
1171 +
1172 +STATIC loff_t
1173 +mini_fo_llseek(file_t *file, loff_t offset, int origin)
1174 +{
1175 + loff_t err;
1176 + file_t *hidden_file = NULL;
1177 +
1178 + if(S_ISDIR(file->f_dentry->d_inode->i_mode)) {
1179 + /* Check if trying to llseek from a directory */
1180 + err = -EISDIR;
1181 + goto out;
1182 + }
1183 + if (ftopd(file) != NULL) {
1184 + if(ftohf2(file)) {
1185 + hidden_file = ftohf2(file);
1186 + } else {
1187 + hidden_file = ftohf(file);
1188 + }
1189 + }
1190 +
1191 + /* always set hidden position to this one */
1192 + hidden_file->f_pos = file->f_pos;
1193 +
1194 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
1195 + memcpy(&(hidden_file->f_ra),
1196 + &(file->f_ra),
1197 + sizeof(struct file_ra_state));
1198 +#else
1199 + if (file->f_reada) { /* update readahead information if needed */
1200 + hidden_file->f_reada = file->f_reada;
1201 + hidden_file->f_ramax = file->f_ramax;
1202 + hidden_file->f_raend = file->f_raend;
1203 + hidden_file->f_ralen = file->f_ralen;
1204 + hidden_file->f_rawin = file->f_rawin;
1205 + }
1206 +#endif
1207 + if (hidden_file->f_op && hidden_file->f_op->llseek)
1208 + err = hidden_file->f_op->llseek(hidden_file, offset, origin);
1209 + else
1210 + err = generic_file_llseek(hidden_file, offset, origin);
1211 +
1212 + if (err < 0)
1213 + goto out;
1214 +
1215 + if (err != file->f_pos) {
1216 + file->f_pos = err;
1217 + // ION maybe this?
1218 + // file->f_pos = hidden_file->f_pos;
1219 +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
1220 + file->f_reada = 0;
1221 +#endif
1222 + file->f_version++;
1223 + }
1224 +
1225 + out:
1226 + return err;
1227 +}
1228 +
1229 +
1230 +/* mk: fanout capable */
1231 +STATIC ssize_t
1232 +mini_fo_read(file_t *file, char *buf, size_t count, loff_t *ppos)
1233 +{
1234 + int err = -EINVAL;
1235 + file_t *hidden_file = NULL;
1236 + loff_t pos = *ppos;
1237 +
1238 + if(S_ISDIR(file->f_dentry->d_inode->i_mode)) {
1239 + /* Check if trying to read from a directory */
1240 + /* printk(KERN_CRIT "mini_fo_read: ERROR: trying to read data from a directory.\n"); */
1241 + err = -EISDIR;
1242 + goto out;
1243 + }
1244 +
1245 + if (ftopd(file) != NULL) {
1246 + if(ftohf2(file)) {
1247 + hidden_file = ftohf2(file);
1248 + } else {
1249 + hidden_file = ftohf(file);
1250 + }
1251 + }
1252 +
1253 + if (!hidden_file->f_op || !hidden_file->f_op->read)
1254 + goto out;
1255 +
1256 + err = hidden_file->f_op->read(hidden_file, buf, count, &pos);
1257 + *ppos = pos;
1258 +
1259 + if (err >= 0) {
1260 + /* atime should also be updated for reads of size zero or more */
1261 + fist_copy_attr_atime(file->f_dentry->d_inode,
1262 + hidden_file->f_dentry->d_inode);
1263 + }
1264 +
1265 +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
1266 + /*
1267 + * MAJOR HACK
1268 + * because pread() does not have any way to tell us that it is
1269 + * our caller, then we don't know for sure if we have to update
1270 + * the file positions. This hack relies on read() having passed us
1271 + * the "real" pointer of its struct file's f_pos field.
1272 + */
1273 + if (ppos == &file->f_pos)
1274 + hidden_file->f_pos = *ppos = pos;
1275 + if (hidden_file->f_reada) { /* update readahead information if needed */
1276 + file->f_reada = hidden_file->f_reada;
1277 + file->f_ramax = hidden_file->f_ramax;
1278 + file->f_raend = hidden_file->f_raend;
1279 + file->f_ralen = hidden_file->f_ralen;
1280 + file->f_rawin = hidden_file->f_rawin;
1281 + }
1282 +#else
1283 + memcpy(&(file->f_ra),&(hidden_file->f_ra),sizeof(struct file_ra_state));
1284 +#endif
1285 +
1286 + out:
1287 + return err;
1288 +}
1289 +
1290 +
1291 +/* this mini_fo_write() does not modify data pages! */
1292 +STATIC ssize_t
1293 +mini_fo_write(file_t *file, const char *buf, size_t count, loff_t *ppos)
1294 +{
1295 + int err = -EINVAL;
1296 + file_t *hidden_file = NULL;
1297 + inode_t *inode;
1298 + inode_t *hidden_inode;
1299 + loff_t pos = *ppos;
1300 +
1301 + /* mk: fan out: */
1302 + if (ftopd(file) != NULL) {
1303 + if(ftohf2(file)) {
1304 + hidden_file = ftohf2(file);
1305 + } else {
1306 + /* This is bad! We have no storage file to write to. This
1307 + * should never happen because if a file is opened for
1308 + * writing, a copy should have been made earlier.
1309 + */
1310 + printk(KERN_CRIT "mini_fo: write : ERROR, no storage file to write.\n");
1311 + err = -EINVAL;
1312 + goto out;
1313 + }
1314 + }
1315 +
1316 + inode = file->f_dentry->d_inode;
1317 + hidden_inode = itohi2(inode);
1318 + if(!hidden_inode) {
1319 + printk(KERN_CRIT "mini_fo: write: no sto inode found, not good.\n");
1320 + goto out;
1321 + }
1322 +
1323 + if (!hidden_file->f_op || !hidden_file->f_op->write)
1324 + goto out;
1325 +
1326 + /* adjust for append -- seek to the end of the file */
1327 + if (file->f_flags & O_APPEND)
1328 + pos = inode->i_size;
1329 +
1330 + err = hidden_file->f_op->write(hidden_file, buf, count, &pos);
1331 +
1332 + /*
1333 + * copy ctime and mtime from lower layer attributes
1334 + * atime is unchanged for both layers
1335 + */
1336 + if (err >= 0)
1337 + fist_copy_attr_times(inode, hidden_inode);
1338 +
1339 + *ppos = pos;
1340 +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
1341 + /*
1342 + * XXX: MAJOR HACK
1343 + *
1344 + * because pwrite() does not have any way to tell us that it is
1345 + * our caller, then we don't know for sure if we have to update
1346 + * the file positions. This hack relies on write() having passed us
1347 + * the "real" pointer of its struct file's f_pos field.
1348 + */
1349 + if (ppos == &file->f_pos)
1350 + hidden_file->f_pos = *ppos = pos;
1351 +#endif
1352 + /* update this inode's size */
1353 + if (pos > inode->i_size)
1354 + inode->i_size = pos;
1355 +
1356 + out:
1357 + return err;
1358 +}
1359 +
1360 +/* Global variable to hold a file_t pointer.
1361 + * This serves to allow mini_fo_filldir function to know which file is
1362 + * beeing read, which is required for two reasons:
1363 + *
1364 + * - be able to call wol functions in order to avoid listing deleted
1365 + * base files.
1366 + * - if we're reading a directory which is in state 1, we need to
1367 + * maintain a list (in mini_fo_filldir) of which files allready
1368 + * have been copied to userspace,to detect files existing in base
1369 + * and storage and not list them twice.
1370 + */
1371 +filldir_t mini_fo_filldir_orig;
1372 +file_t *mini_fo_filldir_file;
1373 +
1374 +/* mainly copied from fs/readdir.c */
1375 +STATIC int
1376 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
1377 +mini_fo_filldir(void * __buf, const char * name, int namlen, loff_t offset,
1378 + u64 ino, unsigned int d_type)
1379 +#else
1380 +mini_fo_filldir(void * __buf, const char * name, int namlen, loff_t offset,
1381 + ino_t ino, unsigned int d_type)
1382 +#endif
1383 +{
1384 + struct getdents_callback * buf = (struct getdents_callback *) __buf;
1385 + file_t* file = mini_fo_filldir_file;
1386 +
1387 + /* In theses states we filter meta files in storage (WOL) */
1388 + if(file && (dtopd(file->f_dentry)->state == MODIFIED ||
1389 + dtopd(file->f_dentry)->state == CREATED ||
1390 + dtopd(file->f_dentry)->state == DEL_REWRITTEN)) {
1391 +
1392 + int tmp = strlen(META_FILENAME);
1393 + if(tmp == namlen) {
1394 + if(!strncmp(name, META_FILENAME, namlen))
1395 + return 0;
1396 + }
1397 + }
1398 +
1399 + /* check if we are merging the contents of storage and base */
1400 + if(file && dtopd(file->f_dentry)->state == MODIFIED) {
1401 + /* check if we are still reading storage contents, if
1402 + * yes, we just save the name of the file for duplicate
1403 + * checking later. */
1404 +
1405 + if(!ftopd(file)->rd.sto_done) {
1406 + /* put file into ndl list */
1407 + if(ndl_add_entry(&ftopd(file)->rd, name, namlen))
1408 + printk(KERN_CRIT "mini_fo_filldir: Error adding to ndl.\n");
1409 + } else {
1410 + /* check if file has been deleted */
1411 + if(meta_check_d_entry(file->f_dentry, name, namlen))
1412 + return 0;
1413 +
1414 + /* do duplicate checking */
1415 + if(ndl_check_entry(&ftopd(file)->rd, name, namlen))
1416 + return 0;
1417 + }
1418 + }
1419 +
1420 + return mini_fo_filldir_orig(buf, name, namlen, offset, ino, d_type);
1421 +}
1422 +
1423 +
1424 +STATIC int
1425 +mini_fo_readdir(file_t *file, void *dirent, filldir_t filldir)
1426 +{
1427 + int err = 0;/* mk: ??? -ENOTDIR; */
1428 + file_t *hidden_file = NULL;
1429 + file_t *hidden_sto_file = NULL;
1430 + inode_t *inode;
1431 + struct getdents_callback *buf;
1432 + int oldcount;
1433 +
1434 +#if defined(FIST_FILTER_NAME) || defined(FIST_FILTER_SCA)
1435 + struct mini_fo_getdents_callback buf;
1436 +#endif /* FIST_FILTER_NAME || FIST_FILTER_SCA */
1437 +
1438 + buf = (struct getdents_callback *) dirent;
1439 + oldcount = buf->count;
1440 + inode = file->f_dentry->d_inode;
1441 + mini_fo_filldir_file = file;
1442 + mini_fo_filldir_orig = filldir;
1443 +
1444 + ftopd(file)->rd.sto_done = 0;
1445 + do {
1446 + if (ftopd(file) != NULL) {
1447 + if(ftohf2(file)) {
1448 + hidden_sto_file = ftohf2(file);
1449 + err = vfs_readdir(hidden_sto_file, mini_fo_filldir, dirent);
1450 + file->f_pos = hidden_sto_file->f_pos;
1451 + if (err > 0)
1452 + fist_copy_attr_atime(inode, hidden_sto_file->f_dentry->d_inode);
1453 + /* not finshed yet, we'll be called again */
1454 + if (buf->count != oldcount)
1455 + break;
1456 + }
1457 +
1458 + ftopd(file)->rd.sto_done = 1;
1459 +
1460 + if(ftohf(file)) {
1461 + hidden_file = ftohf(file);
1462 + err = vfs_readdir(hidden_file, mini_fo_filldir, dirent);
1463 + file->f_pos = hidden_file->f_pos;
1464 + if (err > 0)
1465 + fist_copy_attr_atime(inode, hidden_file->f_dentry->d_inode);
1466 + }
1467 +
1468 + }
1469 + } while (0);
1470 +
1471 + /* mk:
1472 + * we need to check if all the directory data has been copied to userspace,
1473 + * or if we will be called again by userspace to complete the operation.
1474 + */
1475 + if(buf->count == oldcount) {
1476 + ndl_put_list(&ftopd(file)->rd);
1477 + }
1478 +
1479 + /* unset this, safe */
1480 + mini_fo_filldir_file = NULL;
1481 + return err;
1482 +}
1483 +
1484 +
1485 +STATIC unsigned int
1486 +mini_fo_poll(file_t *file, poll_table *wait)
1487 +{
1488 + unsigned int mask = DEFAULT_POLLMASK;
1489 + file_t *hidden_file = NULL;
1490 +
1491 + if (ftopd(file) != NULL) {
1492 + if(ftohf2(file)) {
1493 + hidden_file = ftohf2(file);
1494 + } else {
1495 + hidden_file = ftohf(file);
1496 + }
1497 + }
1498 +
1499 + if (!hidden_file->f_op || !hidden_file->f_op->poll)
1500 + goto out;
1501 +
1502 + mask = hidden_file->f_op->poll(hidden_file, wait);
1503 +
1504 + out:
1505 + return mask;
1506 +}
1507 +
1508 +/* FIST-LITE special version of mmap */
1509 +STATIC int
1510 +mini_fo_mmap(file_t *file, vm_area_t *vma)
1511 +{
1512 + int err = 0;
1513 + file_t *hidden_file = NULL;
1514 +
1515 + /* fanout capability */
1516 + if (ftopd(file) != NULL) {
1517 + if(ftohf2(file)) {
1518 + hidden_file = ftohf2(file);
1519 + } else {
1520 + hidden_file = ftohf(file);
1521 + }
1522 + }
1523 +
1524 + ASSERT(hidden_file != NULL);
1525 + ASSERT(hidden_file->f_op != NULL);
1526 + ASSERT(hidden_file->f_op->mmap != NULL);
1527 +
1528 + vma->vm_file = hidden_file;
1529 + err = hidden_file->f_op->mmap(hidden_file, vma);
1530 + get_file(hidden_file); /* make sure it doesn't get freed on us */
1531 + fput(file); /* no need to keep extra ref on ours */
1532 +
1533 + return err;
1534 +}
1535 +
1536 +
1537 +
1538 +STATIC int
1539 +mini_fo_open(inode_t *inode, file_t *file)
1540 +{
1541 + int err = 0;
1542 + int hidden_flags;
1543 + file_t *hidden_file = NULL;
1544 + dentry_t *hidden_dentry = NULL;
1545 +
1546 + /* fanout stuff */
1547 + file_t *hidden_sto_file = NULL;
1548 + dentry_t *hidden_sto_dentry = NULL;
1549 +
1550 + __ftopd(file) =
1551 + kmalloc(sizeof(struct mini_fo_file_info), GFP_KERNEL);
1552 + if (!ftopd(file)) {
1553 + err = -ENOMEM;
1554 + goto out;
1555 + }
1556 +
1557 + /* init the readdir_helper structure */
1558 + INIT_LIST_HEAD(&ftopd(file)->rd.ndl_list);
1559 + ftopd(file)->rd.ndl_size = 0;
1560 +
1561 + /* In certain paths this could stay uninitalized and cause trouble */
1562 + ftohf(file) = NULL;
1563 + ftohf2(file) = NULL;
1564 + hidden_flags = file->f_flags;
1565 +
1566 + /* create storage files? */
1567 + if(dtost(file->f_dentry) == UNMODIFIED) {
1568 + if(!IS_WRITE_FLAG(file->f_flags)) {
1569 + hidden_dentry = dtohd(file->f_dentry);
1570 + dget(hidden_dentry);
1571 + /* dentry_open will decrement mnt refcnt if err.
1572 + * otherwise fput() will do an mntput() for us upon file close. */
1573 + mntget(stopd(inode->i_sb)->hidden_mnt);
1574 + hidden_file = dentry_open(hidden_dentry,
1575 + stopd(inode->i_sb)->hidden_mnt,
1576 + hidden_flags);
1577 + if (IS_ERR(hidden_file)) {
1578 + err = PTR_ERR(hidden_file);
1579 + dput(hidden_dentry);
1580 + goto out;
1581 + }
1582 + ftohf(file) = hidden_file; /* link two files */
1583 + goto out;
1584 + }
1585 + else {
1586 + if(S_ISDIR(file->f_dentry->d_inode->i_mode)) {
1587 + err = dir_unmod_to_mod(file->f_dentry);
1588 + } else
1589 + err = nondir_unmod_to_mod(file->f_dentry, 1);
1590 +
1591 + if (err) {
1592 + printk("mini_fo_open: ERROR creating storage file.\n");
1593 + goto out;
1594 + }
1595 + }
1596 + }
1597 + hidden_sto_dentry = dtohd2(file->f_dentry);
1598 + dget(hidden_sto_dentry);
1599 +
1600 + if(dtopd(file->f_dentry)->state == MODIFIED) {
1601 + /* Directorys are special, interpose on both lower level files */
1602 + if(S_ISDIR(itohi(inode)->i_mode)) {
1603 + /* check for invalid file types of lower level files */
1604 + if(!(S_ISDIR(itohi(inode)->i_mode) && S_ISDIR(itohi2(inode)->i_mode))) {
1605 + printk(KERN_CRIT "mini_fo_open: meta data corruption detected.\n");
1606 + dput(hidden_sto_dentry);
1607 + err = -EINVAL;
1608 + goto out;
1609 + }
1610 +
1611 + /* lower level directorys are ok, open the base file */
1612 + hidden_dentry = dtohd(file->f_dentry);
1613 + dget(hidden_dentry);
1614 +
1615 + mntget(stopd(inode->i_sb)->hidden_mnt);
1616 + hidden_file = dentry_open(hidden_dentry,
1617 + stopd(inode->i_sb)->hidden_mnt,
1618 + hidden_flags);
1619 + if (IS_ERR(hidden_file)) {
1620 + err = PTR_ERR(hidden_file);
1621 + dput(hidden_dentry);
1622 + dput(hidden_sto_dentry);
1623 + goto out;
1624 + }
1625 + ftohf(file) = hidden_file; /* link the two files */
1626 + }
1627 + }
1628 +
1629 + if(!exists_in_storage(file->f_dentry)) {
1630 + printk(KERN_CRIT "mini_fo_open: invalid file state detected.\n");
1631 + err = -EINVAL;
1632 + dput(hidden_sto_dentry);
1633 +
1634 + /* If the base file has been opened, we need to close it here */
1635 + if(ftohf(file)) {
1636 + if (hidden_file->f_op && hidden_file->f_op->flush)
1637 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
1638 + hidden_file->f_op->flush(hidden_file, NULL);
1639 +#else
1640 + hidden_file->f_op->flush(hidden_file);
1641 +#endif
1642 + dput(hidden_dentry);
1643 + }
1644 + goto out;
1645 + }
1646 +
1647 + /* ok, now we can safely open the storage file */
1648 + mntget(stopd(inode->i_sb)->hidden_mnt2);
1649 + hidden_sto_file = dentry_open(hidden_sto_dentry,
1650 + stopd(inode->i_sb)->hidden_mnt2,
1651 + hidden_flags);
1652 +
1653 + /* dentry_open dputs the dentry if it fails */
1654 + if (IS_ERR(hidden_sto_file)) {
1655 + err = PTR_ERR(hidden_sto_file);
1656 + /* close base file if open */
1657 + if(ftohf(file)) {
1658 + if (hidden_file->f_op && hidden_file->f_op->flush)
1659 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
1660 + hidden_file->f_op->flush(hidden_file, NULL);
1661 +#else
1662 + hidden_file->f_op->flush(hidden_file);
1663 +#endif
1664 + dput(hidden_dentry);
1665 + }
1666 + goto out;
1667 + }
1668 + ftohf2(file) = hidden_sto_file; /* link storage file */
1669 +
1670 + out:
1671 + if (err < 0 && ftopd(file)) {
1672 + kfree(ftopd(file));
1673 + }
1674 + return err;
1675 +}
1676 +
1677 +STATIC int
1678 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
1679 +mini_fo_flush(file_t *file, fl_owner_t id)
1680 +#else
1681 +mini_fo_flush(file_t *file)
1682 +#endif
1683 +{
1684 + int err1 = 0; /* assume ok (see open.c:close_fp) */
1685 + int err2 = 0;
1686 + file_t *hidden_file = NULL;
1687 +
1688 + check_mini_fo_file(file);
1689 +
1690 + /* mk: we don't do any state checking here, as its not worth the time.
1691 + * Just flush the lower level files if they exist.
1692 + */
1693 + if(ftopd(file) != NULL) {
1694 + if(ftohf(file) != NULL) {
1695 + hidden_file = ftohf(file);
1696 + if (hidden_file->f_op && hidden_file->f_op->flush)
1697 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
1698 + err1 = hidden_file->f_op->flush(hidden_file, id);
1699 +#else
1700 + err1 = hidden_file->f_op->flush(hidden_file);
1701 +#endif
1702 + }
1703 + if(ftohf2(file) != NULL) {
1704 + hidden_file = ftohf2(file);
1705 + if (hidden_file->f_op && hidden_file->f_op->flush)
1706 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
1707 + err2 = hidden_file->f_op->flush(hidden_file, id);
1708 +#else
1709 + err2 = hidden_file->f_op->flush(hidden_file);
1710 +#endif
1711 + }
1712 + }
1713 + return (err1 | err2);
1714 +}
1715 +
1716 +
1717 +STATIC int
1718 +mini_fo_release(inode_t *inode, file_t *file)
1719 +{
1720 + int err = 0;
1721 + file_t *hidden_file = NULL;
1722 +
1723 + if (ftopd(file) != NULL) {
1724 + if(ftohf(file)) {
1725 + hidden_file = ftohf(file);
1726 + fput(hidden_file);
1727 + }
1728 + if(ftohf2(file)) {
1729 + hidden_file = ftohf2(file);
1730 + fput(hidden_file);
1731 + }
1732 + kfree(ftopd(file));
1733 + }
1734 + return err;
1735 +}
1736 +
1737 +STATIC int
1738 +mini_fo_fsync(file_t *file, dentry_t *dentry, int datasync)
1739 +{
1740 + int err1 = 0;
1741 + int err2 = 0;
1742 + file_t *hidden_file = NULL;
1743 + dentry_t *hidden_dentry;
1744 +
1745 + check_mini_fo_file(file);
1746 +
1747 + if ((hidden_file = ftohf(file)) != NULL) {
1748 + hidden_dentry = dtohd(dentry);
1749 + if (hidden_file->f_op && hidden_file->f_op->fsync) {
1750 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
1751 + mutex_lock(&hidden_dentry->d_inode->i_mutex);
1752 +#else
1753 + down(&hidden_dentry->d_inode->i_sem);
1754 +#endif
1755 + err1 = hidden_file->f_op->fsync(hidden_file, hidden_dentry, datasync);
1756 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
1757 + mutex_unlock(&hidden_dentry->d_inode->i_mutex);
1758 +#else
1759 + up(&hidden_dentry->d_inode->i_sem);
1760 +#endif
1761 + }
1762 + }
1763 +
1764 + if ((hidden_file = ftohf2(file)) != NULL) {
1765 + hidden_dentry = dtohd2(dentry);
1766 + if (hidden_file->f_op && hidden_file->f_op->fsync) {
1767 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
1768 + mutex_lock(&hidden_dentry->d_inode->i_mutex);
1769 +#else
1770 + down(&hidden_dentry->d_inode->i_sem);
1771 +#endif
1772 + err2 = hidden_file->f_op->fsync(hidden_file, hidden_dentry, datasync);
1773 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
1774 + mutex_unlock(&hidden_dentry->d_inode->i_mutex);
1775 +#else
1776 + up(&hidden_dentry->d_inode->i_sem);
1777 +#endif
1778 + }
1779 + }
1780 + else
1781 + goto err;
1782 +
1783 +err:
1784 + return (err1 || err2);
1785 +}
1786 +
1787 +
1788 +STATIC int
1789 +mini_fo_fasync(int fd, file_t *file, int flag)
1790 +{
1791 + int err1 = 0;
1792 + int err2 = 0;
1793 +
1794 + file_t *hidden_file = NULL;
1795 +
1796 + check_mini_fo_file(file);
1797 +
1798 + if((hidden_file = ftohf(file)) != NULL) {
1799 + err1 = hidden_file->f_op->fasync(fd, hidden_file, flag);
1800 + }
1801 + if((hidden_file = ftohf2(file)) != NULL) {
1802 + err2 = hidden_file->f_op->fasync(fd, hidden_file, flag);
1803 + }
1804 +
1805 + return (err1 || err2);
1806 +}
1807 +
1808 +
1809 +
1810 +struct file_operations mini_fo_dir_fops =
1811 + {
1812 + read: generic_read_dir,
1813 + write: mini_fo_write,
1814 + readdir: mini_fo_readdir,
1815 + poll: mini_fo_poll,
1816 + /* ioctl: mini_fo_ioctl, */
1817 + mmap: mini_fo_mmap,
1818 + open: mini_fo_open,
1819 + flush: mini_fo_flush,
1820 + release: mini_fo_release,
1821 + fsync: mini_fo_fsync,
1822 + fasync: mini_fo_fasync,
1823 + /* not needed lock: mini_fo_lock, */
1824 + /* not needed: readv */
1825 + /* not needed: writev */
1826 + /* not implemented: sendpage */
1827 + /* not implemented: get_unmapped_area */
1828 + };
1829 +
1830 +struct file_operations mini_fo_main_fops =
1831 + {
1832 + llseek: mini_fo_llseek,
1833 + read: mini_fo_read,
1834 + write: mini_fo_write,
1835 + readdir: mini_fo_readdir,
1836 + poll: mini_fo_poll,
1837 + /* ioctl: mini_fo_ioctl, */
1838 + mmap: mini_fo_mmap,
1839 + open: mini_fo_open,
1840 + flush: mini_fo_flush,
1841 + release: mini_fo_release,
1842 + fsync: mini_fo_fsync,
1843 + fasync: mini_fo_fasync,
1844 + /* not needed: lock: mini_fo_lock, */
1845 + /* not needed: readv */
1846 + /* not needed: writev */
1847 + /* not implemented: sendpage */
1848 + /* not implemented: get_unmapped_area */
1849 + };
1850 --- /dev/null
1851 +++ b/fs/mini_fo/fist.h
1852 @@ -0,0 +1,252 @@
1853 +/*
1854 + * Copyright (c) 1997-2003 Erez Zadok
1855 + * Copyright (c) 2001-2003 Stony Brook University
1856 + *
1857 + * For specific licensing information, see the COPYING file distributed with
1858 + * this package, or get one from ftp://ftp.filesystems.org/pub/fist/COPYING.
1859 + *
1860 + * This Copyright notice must be kept intact and distributed with all
1861 + * fistgen sources INCLUDING sources generated by fistgen.
1862 + */
1863 +/*
1864 + * Copyright (C) 2004, 2005 Markus Klotzbuecher <mk@creamnet.de>
1865 + *
1866 + * This program is free software; you can redistribute it and/or
1867 + * modify it under the terms of the GNU General Public License
1868 + * as published by the Free Software Foundation; either version
1869 + * 2 of the License, or (at your option) any later version.
1870 + */
1871 +
1872 +
1873 +/*
1874 + * $Id$
1875 + */
1876 +
1877 +#ifndef __FIST_H_
1878 +#define __FIST_H_
1879 +
1880 +/*
1881 + * KERNEL ONLY CODE:
1882 + */
1883 +#ifdef __KERNEL__
1884 +#include <linux/version.h>
1885 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,19)
1886 +#include <linux/autoconf.h>
1887 +#else
1888 +#include <linux/config.h>
1889 +#endif
1890 +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
1891 +#ifdef CONFIG_MODVERSIONS
1892 +# define MODVERSIONS
1893 +# include <linux/modversions.h>
1894 +#endif /* CONFIG_MODVERSIONS */
1895 +#endif /* KERNEL_VERSION < 2.6.0 */
1896 +#include <linux/sched.h>
1897 +#include <linux/kernel.h>
1898 +#include <linux/mm.h>
1899 +#include <linux/string.h>
1900 +#include <linux/stat.h>
1901 +#include <linux/errno.h>
1902 +#include <linux/wait.h>
1903 +#include <linux/limits.h>
1904 +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
1905 +#include <linux/locks.h>
1906 +#else
1907 +#include <linux/buffer_head.h>
1908 +#include <linux/pagemap.h>
1909 +#include <linux/namei.h>
1910 +#include <linux/module.h>
1911 +#include <linux/mount.h>
1912 +#include <linux/page-flags.h>
1913 +#include <linux/writeback.h>
1914 +#include <linux/statfs.h>
1915 +#endif
1916 +#include <linux/smp.h>
1917 +#include <linux/smp_lock.h>
1918 +#include <linux/file.h>
1919 +#include <linux/slab.h>
1920 +#include <linux/vmalloc.h>
1921 +#include <linux/poll.h>
1922 +#include <linux/list.h>
1923 +#include <linux/init.h>
1924 +
1925 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,20)
1926 +#include <linux/xattr.h>
1927 +#endif
1928 +
1929 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
1930 +#include <linux/security.h>
1931 +#endif
1932 +
1933 +#include <linux/swap.h>
1934 +
1935 +#include <asm/system.h>
1936 +/* #include <asm/segment.h> */
1937 +#include <asm/mman.h>
1938 +#include <linux/seq_file.h>
1939 +
1940 +/*
1941 + * MACROS:
1942 + */
1943 +
1944 +/* those mapped to ATTR_* were copied from linux/fs.h */
1945 +#define FA_MODE ATTR_MODE
1946 +#define FA_UID ATTR_UID
1947 +#define FA_GID ATTR_GID
1948 +#define FA_SIZE ATTR_SIZE
1949 +#define FA_ATIME ATTR_ATIME
1950 +#define FA_MTIME ATTR_MTIME
1951 +#define FA_CTIME ATTR_CTIME
1952 +#define FA_ATIME_SET ATTR_ATIME_SET
1953 +#define FA_MTIME_SET ATTR_MTIME_SET
1954 +#define FA_FORCE ATTR_FORCE
1955 +#define FA_ATTR_FLAGS ATTR_ATTR_FLAG
1956 +
1957 +/* must be greater than all other ATTR_* flags! */
1958 +#define FA_NLINK 2048
1959 +#define FA_BLKSIZE 4096
1960 +#define FA_BLOCKS 8192
1961 +#define FA_TIMES (FA_ATIME|FA_MTIME|FA_CTIME)
1962 +#define FA_ALL 0
1963 +
1964 +/* macros to manage changes between kernels */
1965 +#define INODE_DATA(i) (&(i)->i_data)
1966 +
1967 +#define MIN(x,y) ((x < y) ? (x) : (y))
1968 +#define MAX(x,y) ((x > y) ? (x) : (y))
1969 +#define MAXPATHLEN PATH_MAX
1970 +
1971 +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,4,5)
1972 +# define lookup_one_len(a,b,c) lookup_one(a,b)
1973 +#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(2,4,5) */
1974 +
1975 +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,4,8)
1976 +# define generic_file_llseek default_llseek
1977 +#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(2,4,8) */
1978 +
1979 +#ifndef SEEK_SET
1980 +# define SEEK_SET 0
1981 +#endif /* not SEEK_SET */
1982 +
1983 +#ifndef SEEK_CUR
1984 +# define SEEK_CUR 1
1985 +#endif /* not SEEK_CUR */
1986 +
1987 +#ifndef SEEK_END
1988 +# define SEEK_END 2
1989 +#endif /* not SEEK_END */
1990 +
1991 +#ifndef DEFAULT_POLLMASK
1992 +# define DEFAULT_POLLMASK (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)
1993 +#endif /* not DEFAULT_POLLMASK */
1994 +
1995 +/* XXX: fix this so fistgen generates kfree() code directly */
1996 +#define kfree_s(a,b) kfree(a)
1997 +
1998 +/*
1999 + * TYPEDEFS:
2000 + */
2001 +typedef struct dentry dentry_t;
2002 +typedef struct file file_t;
2003 +typedef struct inode inode_t;
2004 +typedef inode_t vnode_t;
2005 +typedef struct page page_t;
2006 +typedef struct qstr qstr_t;
2007 +typedef struct super_block super_block_t;
2008 +typedef super_block_t vfs_t;
2009 +typedef struct vm_area_struct vm_area_t;
2010 +
2011 +
2012 +/*
2013 + * EXTERNALS:
2014 + */
2015 +
2016 +#define FPPF(str,page) printk("PPF %s 0x%x/%d: Lck:%d Err:%d Ref:%d Upd:%d Other::%d:%d:%d:%d:\n", \
2017 + str, \
2018 + (int) page, \
2019 + (int) page->index, \
2020 + (PageLocked(page) ? 1 : 0), \
2021 + (PageError(page) ? 1 : 0), \
2022 + (PageReferenced(page) ? 1 : 0), \
2023 + (Page_Uptodate(page) ? 1 : 0), \
2024 + (PageDecrAfter(page) ? 1 : 0), \
2025 + (PageSlab(page) ? 1 : 0), \
2026 + (PageSwapCache(page) ? 1 : 0), \
2027 + (PageReserved(page) ? 1 : 0) \
2028 + )
2029 +#define EZKDBG printk("EZK %s:%d:%s\n",__FILE__,__LINE__,__FUNCTION__)
2030 +#if 0
2031 +# define EZKDBG1 printk("EZK %s:%d\n",__FILE__,__LINE__)
2032 +#else
2033 +# define EZKDBG1
2034 +#endif
2035 +
2036 +extern int fist_get_debug_value(void);
2037 +extern int fist_set_debug_value(int val);
2038 +#if 0 /* mini_fo doesn't need these */
2039 +extern void fist_dprint_internal(int level, char *str,...);
2040 +extern void fist_print_dentry(char *str, const dentry_t *dentry);
2041 +extern void fist_print_inode(char *str, const inode_t *inode);
2042 +extern void fist_print_file(char *str, const file_t *file);
2043 +extern void fist_print_buffer_flags(char *str, struct buffer_head *buffer);
2044 +extern void fist_print_page_flags(char *str, page_t *page);
2045 +extern void fist_print_page_bytes(char *str, page_t *page);
2046 +extern void fist_print_pte_flags(char *str, const page_t *page);
2047 +extern void fist_checkinode(inode_t *inode, char *msg);
2048 +extern void fist_print_sb(char *str, const super_block_t *sb);
2049 +
2050 +/* ยง$% by mk: special debug functions */
2051 +extern void fist_mk_print_dentry(char *str, const dentry_t *dentry);
2052 +extern void fist_mk_print_inode(char *str, const inode_t *inode);
2053 +
2054 +extern char *add_indent(void);
2055 +extern char *del_indent(void);
2056 +#endif/* mini_fo doesn't need these */
2057 +
2058 +
2059 +#define STATIC
2060 +#define ASSERT(EX) \
2061 +do { \
2062 + if (!(EX)) { \
2063 + printk(KERN_CRIT "ASSERTION FAILED: %s at %s:%d (%s)\n", #EX, \
2064 + __FILE__, __LINE__, __FUNCTION__); \
2065 + (*((char *)0))=0; \
2066 + } \
2067 +} while (0)
2068 +/* same ASSERT, but tell me who was the caller of the function */
2069 +#define ASSERT2(EX) \
2070 +do { \
2071 + if (!(EX)) { \
2072 + printk(KERN_CRIT "ASSERTION FAILED (caller): %s at %s:%d (%s)\n", #EX, \
2073 + file, line, func); \
2074 + (*((char *)0))=0; \
2075 + } \
2076 +} while (0)
2077 +
2078 +#if 0 /* mini_fo doesn't need these */
2079 +#define dprintk(format, args...) printk(KERN_DEBUG format, ##args)
2080 +#define fist_dprint(level, str, args...) fist_dprint_internal(level, KERN_DEBUG str, ## args)
2081 +#define print_entry_location() fist_dprint(4, "%sIN: %s %s:%d\n", add_indent(), __FUNCTION__, __FILE__, __LINE__)
2082 +#define print_exit_location() fist_dprint(4, "%s OUT: %s %s:%d\n", del_indent(), __FUNCTION__, __FILE__, __LINE__)
2083 +#define print_exit_status(status) fist_dprint(4, "%s OUT: %s %s:%d, STATUS: %d\n", del_indent(), __FUNCTION__, __FILE__, __LINE__, status)
2084 +#define print_exit_pointer(status) \
2085 +do { \
2086 + if (IS_ERR(status)) \
2087 + fist_dprint(4, "%s OUT: %s %s:%d, RESULT: %ld\n", del_indent(), __FUNCTION__, __FILE__, __LINE__, PTR_ERR(status)); \
2088 + else \
2089 + fist_dprint(4, "%s OUT: %s %s:%d, RESULT: 0x%x\n", del_indent(), __FUNCTION__, __FILE__, __LINE__, PTR_ERR(status)); \
2090 +} while (0)
2091 +#endif/* mini_fo doesn't need these */
2092 +
2093 +#endif /* __KERNEL__ */
2094 +
2095 +
2096 +/*
2097 + * DEFINITIONS FOR USER AND KERNEL CODE:
2098 + * (Note: ioctl numbers 1--9 are reserved for fistgen, the rest
2099 + * are auto-generated automatically based on the user's .fist file.)
2100 + */
2101 +# define FIST_IOCTL_GET_DEBUG_VALUE _IOR(0x15, 1, int)
2102 +# define FIST_IOCTL_SET_DEBUG_VALUE _IOW(0x15, 2, int)
2103 +
2104 +#endif /* not __FIST_H_ */
2105 --- /dev/null
2106 +++ b/fs/mini_fo/inode.c
2107 @@ -0,0 +1,1564 @@
2108 +/*
2109 + * Copyright (c) 1997-2003 Erez Zadok
2110 + * Copyright (c) 2001-2003 Stony Brook University
2111 + *
2112 + * For specific licensing information, see the COPYING file distributed with
2113 + * this package, or get one from ftp://ftp.filesystems.org/pub/fist/COPYING.
2114 + *
2115 + * This Copyright notice must be kept intact and distributed with all
2116 + * fistgen sources INCLUDING sources generated by fistgen.
2117 + */
2118 +/*
2119 + * Copyright (C) 2004, 2005 Markus Klotzbuecher <mk@creamnet.de>
2120 + *
2121 + * This program is free software; you can redistribute it and/or
2122 + * modify it under the terms of the GNU General Public License
2123 + * as published by the Free Software Foundation; either version
2124 + * 2 of the License, or (at your option) any later version.
2125 + */
2126 +
2127 +/*
2128 + * $Id$
2129 + */
2130 +
2131 +#ifdef HAVE_CONFIG_H
2132 +# include <config.h>
2133 +#endif
2134 +
2135 +#include "fist.h"
2136 +#include "mini_fo.h"
2137 +
2138 +STATIC int
2139 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
2140 +mini_fo_create(inode_t *dir, dentry_t *dentry, int mode, struct nameidata *nd)
2141 +#else
2142 +mini_fo_create(inode_t *dir, dentry_t *dentry, int mode)
2143 +#endif
2144 +{
2145 + int err = 0;
2146 +
2147 + check_mini_fo_dentry(dentry);
2148 +
2149 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
2150 + err = create_sto_reg_file(dentry, mode, nd);
2151 +#else
2152 + err = create_sto_reg_file(dentry, mode);
2153 +#endif
2154 + check_mini_fo_dentry(dentry);
2155 + return err;
2156 +}
2157 +
2158 +
2159 +STATIC dentry_t *
2160 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
2161 +mini_fo_lookup(inode_t *dir, dentry_t *dentry, struct nameidata* nd)
2162 +#else
2163 +mini_fo_lookup(inode_t *dir, dentry_t *dentry)
2164 +#endif
2165 +{
2166 + int err = 0;
2167 + dentry_t *hidden_dir_dentry;
2168 + dentry_t *hidden_dentry = NULL;
2169 +
2170 + dentry_t *hidden_sto_dir_dentry;
2171 + dentry_t *hidden_sto_dentry = NULL;
2172 +
2173 + /* whiteout flag */
2174 + int del_flag = 0;
2175 + char *bpath = NULL;
2176 +
2177 + const char *name;
2178 + unsigned int namelen;
2179 +
2180 + /* Don't allow lookups of META-files */
2181 + namelen = strlen(META_FILENAME);
2182 + if(namelen == dentry->d_name.len) {
2183 + if(!strncmp(dentry->d_name.name, META_FILENAME, namelen)) {
2184 + err = -ENOENT;
2185 + goto out;
2186 + }
2187 + }
2188 +
2189 + hidden_dir_dentry = dtohd(dentry->d_parent);
2190 + hidden_sto_dir_dentry = dtohd2(dentry->d_parent);
2191 +
2192 + name = dentry->d_name.name;
2193 + namelen = dentry->d_name.len;
2194 +
2195 + /* must initialize dentry operations */
2196 + dentry->d_op = &mini_fo_dops;
2197 +
2198 + /* setup the del_flag */
2199 + del_flag = __meta_check_d_entry(dir, name, namelen);
2200 + bpath = __meta_check_r_entry(dir, name, namelen);
2201 +
2202 + /* perform the lookups of base and storage files:
2203 + *
2204 + * This caused some serious trouble, as a lookup_one_len passing
2205 + * a negative dentry oopses. Solution is to only do the lookup
2206 + * if the dentry is positive, else we set it to NULL
2207 + * More trouble, who said a *_dir_dentry can't be NULL?
2208 + */
2209 + if(bpath) {
2210 + /* Cross-Interposing (C), yeah! */
2211 + hidden_dentry = bpath_walk(dir->i_sb, bpath);
2212 + if(!hidden_dentry || !hidden_dentry->d_inode) {
2213 + printk(KERN_CRIT "mini_fo_lookup: bpath_walk failed.\n");
2214 + err= -EINVAL;
2215 + goto out;
2216 + }
2217 +
2218 + /* this can be set up safely without fear of spaghetti
2219 + * interposing as it is only used for copying times */
2220 + hidden_dir_dentry = hidden_dentry->d_parent;
2221 + kfree(bpath);
2222 + }
2223 + else if(hidden_dir_dentry && hidden_dir_dentry->d_inode)
2224 + hidden_dentry =
2225 + lookup_one_len(name, hidden_dir_dentry, namelen);
2226 + else
2227 + hidden_dentry = NULL;
2228 +
2229 + if(hidden_sto_dir_dentry && hidden_sto_dir_dentry->d_inode)
2230 + hidden_sto_dentry =
2231 + lookup_one_len(name, hidden_sto_dir_dentry, namelen);
2232 + else
2233 + hidden_sto_dentry = NULL;
2234 +
2235 + /* catch error in lookup */
2236 + if (IS_ERR(hidden_dentry) || IS_ERR(hidden_sto_dentry)) {
2237 + /* mk: we need to call dput on the dentry, whose
2238 + * lookup_one_len operation failed, in order to avoid
2239 + * unmount trouble.
2240 + */
2241 + if(IS_ERR(hidden_dentry)) {
2242 + printk(KERN_CRIT "mini_fo_lookup: ERR from base dentry, lookup failed.\n");
2243 + err = PTR_ERR(hidden_dentry);
2244 + } else {
2245 + dput(hidden_dentry);
2246 + }
2247 + if(IS_ERR(hidden_sto_dentry)) {
2248 + printk(KERN_CRIT "mini_fo_lookup: ERR from storage dentry, lookup failed.\n");
2249 + err = PTR_ERR(hidden_sto_dentry);
2250 + } else {
2251 + dput(hidden_sto_dentry);
2252 + }
2253 + goto out;
2254 + }
2255 +
2256 + /* allocate dentry private data */
2257 + __dtopd(dentry) = (struct mini_fo_dentry_info *)
2258 + kmalloc(sizeof(struct mini_fo_dentry_info), GFP_KERNEL);
2259 +
2260 + if (!dtopd(dentry)) {
2261 + err = -ENOMEM;
2262 + goto out_dput;
2263 + }
2264 +
2265 + /* check for different states of the mini_fo file to be looked up. */
2266 +
2267 + /* state 1, file has been modified */
2268 + if(hidden_dentry && hidden_sto_dentry &&
2269 + hidden_dentry->d_inode && hidden_sto_dentry->d_inode && !del_flag) {
2270 +
2271 + /* update parent directory's atime */
2272 + fist_copy_attr_atime(dir, hidden_sto_dir_dentry->d_inode);
2273 +
2274 + dtopd(dentry)->state = MODIFIED;
2275 + dtohd(dentry) = hidden_dentry;
2276 + dtohd2(dentry) = hidden_sto_dentry;
2277 +
2278 + err = mini_fo_tri_interpose(hidden_dentry,
2279 + hidden_sto_dentry,
2280 + dentry, dir->i_sb, 1);
2281 + if (err) {
2282 + printk(KERN_CRIT "mini_fo_lookup: error interposing (state1).\n");
2283 + goto out_free;
2284 + }
2285 + goto out;
2286 + }
2287 + /* state 2, file is unmodified */
2288 + if(hidden_dentry && hidden_dentry->d_inode && !del_flag) {
2289 +
2290 + fist_copy_attr_atime(dir, hidden_dir_dentry->d_inode);
2291 +
2292 + dtopd(dentry)->state = UNMODIFIED;
2293 + dtohd(dentry) = hidden_dentry;
2294 + dtohd2(dentry) = hidden_sto_dentry; /* could be negative */
2295 +
2296 + err = mini_fo_tri_interpose(hidden_dentry,
2297 + hidden_sto_dentry,
2298 + dentry, dir->i_sb, 1);
2299 + if (err) {
2300 + printk(KERN_CRIT "mini_fo_lookup: error interposing (state2).\n");
2301 + goto out_free;
2302 + }
2303 + goto out;
2304 + }
2305 + /* state 3, file has been newly created */
2306 + if(hidden_sto_dentry && hidden_sto_dentry->d_inode && !del_flag) {
2307 +
2308 + fist_copy_attr_atime(dir, hidden_sto_dir_dentry->d_inode);
2309 + dtopd(dentry)->state = CREATED;
2310 + dtohd(dentry) = hidden_dentry; /* could be negative */
2311 + dtohd2(dentry) = hidden_sto_dentry;
2312 +
2313 + err = mini_fo_tri_interpose(hidden_dentry,
2314 + hidden_sto_dentry,
2315 + dentry, dir->i_sb, 1);
2316 + if (err) {
2317 + printk(KERN_CRIT "mini_fo_lookup: error interposing (state3).\n");
2318 + goto out_free;
2319 + }
2320 + goto out;
2321 + }
2322 +
2323 + /* state 4, file has deleted and created again. */
2324 + if(hidden_dentry && hidden_sto_dentry &&
2325 + hidden_dentry->d_inode &&
2326 + hidden_sto_dentry->d_inode && del_flag) {
2327 +
2328 + fist_copy_attr_atime(dir, hidden_sto_dir_dentry->d_inode);
2329 + dtopd(dentry)->state = DEL_REWRITTEN;
2330 + dtohd(dentry) = NULL;
2331 + dtohd2(dentry) = hidden_sto_dentry;
2332 +
2333 + err = mini_fo_tri_interpose(NULL,
2334 + hidden_sto_dentry,
2335 + dentry, dir->i_sb, 1);
2336 + if (err) {
2337 + printk(KERN_CRIT "mini_fo_lookup: error interposing (state4).\n");
2338 + goto out_free;
2339 + }
2340 + /* We will never need this dentry again, as the file has been
2341 + * deleted from base */
2342 + dput(hidden_dentry);
2343 + goto out;
2344 + }
2345 + /* state 5, file has been deleted in base */
2346 + if(hidden_dentry && hidden_sto_dentry &&
2347 + hidden_dentry->d_inode &&
2348 + !hidden_sto_dentry->d_inode && del_flag) {
2349 +
2350 + /* check which parents atime we need for updating */
2351 + if(hidden_sto_dir_dentry->d_inode)
2352 + fist_copy_attr_atime(dir,
2353 + hidden_sto_dir_dentry->d_inode);
2354 + else
2355 + fist_copy_attr_atime(dir,
2356 + hidden_dir_dentry->d_inode);
2357 +
2358 + dtopd(dentry)->state = DELETED;
2359 + dtohd(dentry) = NULL;
2360 + dtohd2(dentry) = hidden_sto_dentry;
2361 +
2362 + /* add negative dentry to dcache to speed up lookups */
2363 + d_add(dentry, NULL);
2364 + dput(hidden_dentry);
2365 + goto out;
2366 + }
2367 + /* state 6, file does not exist */
2368 + if(((hidden_dentry && !hidden_dentry->d_inode) ||
2369 + (hidden_sto_dentry && !hidden_sto_dentry->d_inode)) && !del_flag)
2370 + {
2371 + /* check which parents atime we need for updating */
2372 + if(hidden_sto_dir_dentry && hidden_sto_dir_dentry->d_inode)
2373 + fist_copy_attr_atime(dir, hidden_sto_dir_dentry->d_inode);
2374 + else
2375 + fist_copy_attr_atime(dir, hidden_dir_dentry->d_inode);
2376 +
2377 + dtopd(dentry)->state = NON_EXISTANT;
2378 + dtohd(dentry) = hidden_dentry;
2379 + dtohd2(dentry) = hidden_sto_dentry;
2380 + d_add(dentry, NULL);
2381 + goto out;
2382 + }
2383 +
2384 + /* if we get to here, were in an invalid state. bad. */
2385 + printk(KERN_CRIT "mini_fo_lookup: ERROR, meta data corruption detected.\n");
2386 +
2387 + /* end state checking */
2388 + out_free:
2389 + d_drop(dentry); /* so that our bad dentry will get destroyed */
2390 + kfree(dtopd(dentry));
2391 + __dtopd(dentry) = NULL; /* be safe */
2392 +
2393 + out_dput:
2394 + if(hidden_dentry)
2395 + dput(hidden_dentry);
2396 + if(hidden_sto_dentry)
2397 + dput(hidden_sto_dentry); /* drops usage count and marks for release */
2398 +
2399 + out:
2400 + /* initalize wol if file exists and is directory */
2401 + if(dentry->d_inode) {
2402 + if(S_ISDIR(dentry->d_inode->i_mode)) {
2403 + itopd(dentry->d_inode)->deleted_list_size = -1;
2404 + itopd(dentry->d_inode)->renamed_list_size = -1;
2405 + meta_build_lists(dentry);
2406 + }
2407 + }
2408 + return ERR_PTR(err);
2409 +}
2410 +
2411 +
2412 +STATIC int
2413 +mini_fo_link(dentry_t *old_dentry, inode_t *dir, dentry_t *new_dentry)
2414 +{
2415 + int err;
2416 + dentry_t *hidden_old_dentry;
2417 + dentry_t *hidden_new_dentry;
2418 + dentry_t *hidden_dir_dentry;
2419 +
2420 +
2421 + check_mini_fo_dentry(old_dentry);
2422 + check_mini_fo_dentry(new_dentry);
2423 + check_mini_fo_inode(dir);
2424 +
2425 + /* no links to directorys and existing targets target allowed */
2426 + if(S_ISDIR(old_dentry->d_inode->i_mode) ||
2427 + is_mini_fo_existant(new_dentry)) {
2428 + err = -EPERM;
2429 + goto out;
2430 + }
2431 +
2432 + /* bring it directly from unmod to del_rew */
2433 + if(dtost(old_dentry) == UNMODIFIED) {
2434 + err = nondir_unmod_to_mod(old_dentry, 1);
2435 + if(err) {
2436 + err = -EINVAL;
2437 + goto out;
2438 + }
2439 + err = meta_add_d_entry(old_dentry->d_parent,
2440 + old_dentry->d_name.name,
2441 + old_dentry->d_name.len);
2442 + if(err) {
2443 + err = -EINVAL;
2444 + goto out;
2445 + }
2446 + dput(dtohd(old_dentry));
2447 + dtohd(old_dentry) = NULL;
2448 + dtost(old_dentry) = DEL_REWRITTEN;
2449 + }
2450 +
2451 + err = get_neg_sto_dentry(new_dentry);
2452 + if(err) {
2453 + err = -EINVAL;
2454 + goto out;
2455 + }
2456 +
2457 + hidden_old_dentry = dtohd2(old_dentry);
2458 + hidden_new_dentry = dtohd2(new_dentry);
2459 +
2460 + dget(hidden_old_dentry);
2461 + dget(hidden_new_dentry);
2462 +
2463 + /* was: hidden_dir_dentry = lock_parent(hidden_new_dentry); */
2464 + hidden_dir_dentry = dget(hidden_new_dentry->d_parent);
2465 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
2466 + mutex_lock(&hidden_dir_dentry->d_inode->i_mutex);
2467 +#else
2468 + down(&hidden_dir_dentry->d_inode->i_sem);
2469 +#endif
2470 +
2471 + err = vfs_link(hidden_old_dentry,
2472 + hidden_dir_dentry->d_inode,
2473 + hidden_new_dentry);
2474 + if (err || !hidden_new_dentry->d_inode)
2475 + goto out_lock;
2476 +
2477 + dtost(new_dentry) = CREATED;
2478 + err = mini_fo_tri_interpose(NULL, hidden_new_dentry, new_dentry, dir->i_sb, 0);
2479 + if (err)
2480 + goto out_lock;
2481 +
2482 + fist_copy_attr_timesizes(dir, hidden_new_dentry->d_inode);
2483 + /* propagate number of hard-links */
2484 + old_dentry->d_inode->i_nlink = itohi2(old_dentry->d_inode)->i_nlink;
2485 +
2486 + out_lock:
2487 + /* was: unlock_dir(hidden_dir_dentry); */
2488 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
2489 + mutex_unlock(&hidden_dir_dentry->d_inode->i_mutex);
2490 +#else
2491 + up(&hidden_dir_dentry->d_inode->i_sem);
2492 +#endif
2493 + dput(hidden_dir_dentry);
2494 +
2495 + dput(hidden_new_dentry);
2496 + dput(hidden_old_dentry);
2497 + if (!new_dentry->d_inode)
2498 + d_drop(new_dentry);
2499 +
2500 + out:
2501 + return err;
2502 +}
2503 +
2504 +
2505 +STATIC int
2506 +mini_fo_unlink(inode_t *dir, dentry_t *dentry)
2507 +{
2508 + int err = 0;
2509 +
2510 + dget(dentry);
2511 + if(dtopd(dentry)->state == MODIFIED) {
2512 + err = nondir_mod_to_del(dentry);
2513 + goto out;
2514 + }
2515 + else if(dtopd(dentry)->state == UNMODIFIED) {
2516 + err = nondir_unmod_to_del(dentry);
2517 + goto out;
2518 + }
2519 + else if(dtopd(dentry)->state == CREATED) {
2520 + err = nondir_creat_to_del(dentry);
2521 + goto out;
2522 + }
2523 + else if(dtopd(dentry)->state == DEL_REWRITTEN) {
2524 + err = nondir_del_rew_to_del(dentry);
2525 + goto out;
2526 + }
2527 +
2528 + printk(KERN_CRIT "mini_fo_unlink: ERROR, invalid state detected.\n");
2529 +
2530 + out:
2531 + fist_copy_attr_times(dir, itohi2(dentry->d_parent->d_inode));
2532 +
2533 + if(!err) {
2534 + /* is this causing my pain? d_delete(dentry); */
2535 + d_drop(dentry);
2536 + }
2537 +
2538 + dput(dentry);
2539 + return err;
2540 +}
2541 +
2542 +
2543 +STATIC int
2544 +mini_fo_symlink(inode_t *dir, dentry_t *dentry, const char *symname)
2545 +{
2546 + int err=0;
2547 + dentry_t *hidden_sto_dentry;
2548 + dentry_t *hidden_sto_dir_dentry;
2549 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
2550 + umode_t mode;
2551 +#endif
2552 +
2553 + /* Fail if the symlink file exists */
2554 + if(!(dtost(dentry) == DELETED ||
2555 + dtost(dentry) == NON_EXISTANT)) {
2556 + err = -EEXIST;
2557 + goto out;
2558 + }
2559 +
2560 + err = get_neg_sto_dentry(dentry);
2561 + if(err) {
2562 + err = -EINVAL;
2563 + goto out;
2564 + }
2565 + hidden_sto_dentry = dtohd2(dentry);
2566 +
2567 + dget(hidden_sto_dentry);
2568 + /* was: hidden_sto_dir_dentry = lock_parent(hidden_sto_dentry); */
2569 + hidden_sto_dir_dentry = dget(hidden_sto_dentry->d_parent);
2570 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
2571 + mutex_lock(&hidden_sto_dir_dentry->d_inode->i_mutex);
2572 +#else
2573 + down(&hidden_sto_dir_dentry->d_inode->i_sem);
2574 +#endif
2575 +
2576 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
2577 + mode = S_IALLUGO;
2578 + err = vfs_symlink(hidden_sto_dir_dentry->d_inode,
2579 + hidden_sto_dentry, symname, mode);
2580 +#else
2581 + err = vfs_symlink(hidden_sto_dir_dentry->d_inode,
2582 + hidden_sto_dentry,
2583 + symname);
2584 +#endif
2585 + if (err || !hidden_sto_dentry->d_inode)
2586 + goto out_lock;
2587 +
2588 + if(dtost(dentry) == DELETED) {
2589 + dtost(dentry) = DEL_REWRITTEN;
2590 + err = mini_fo_tri_interpose(NULL, hidden_sto_dentry, dentry, dir->i_sb, 0);
2591 + if(err)
2592 + goto out_lock;
2593 + } else if(dtost(dentry) == NON_EXISTANT) {
2594 + dtost(dentry) = CREATED;
2595 + err = mini_fo_tri_interpose(dtohd(dentry), hidden_sto_dentry, dentry, dir->i_sb, 0);
2596 + if(err)
2597 + goto out_lock;
2598 + }
2599 + fist_copy_attr_timesizes(dir, hidden_sto_dir_dentry->d_inode);
2600 +
2601 + out_lock:
2602 + /* was: unlock_dir(hidden_sto_dir_dentry); */
2603 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
2604 + mutex_unlock(&hidden_sto_dir_dentry->d_inode->i_mutex);
2605 +#else
2606 + up(&hidden_sto_dir_dentry->d_inode->i_sem);
2607 +#endif
2608 + dput(hidden_sto_dir_dentry);
2609 +
2610 + dput(hidden_sto_dentry);
2611 + if (!dentry->d_inode)
2612 + d_drop(dentry);
2613 + out:
2614 + return err;
2615 +}
2616 +
2617 +STATIC int
2618 +mini_fo_mkdir(inode_t *dir, dentry_t *dentry, int mode)
2619 +{
2620 + int err;
2621 +
2622 + err = create_sto_dir(dentry, mode);
2623 +
2624 + check_mini_fo_dentry(dentry);
2625 +
2626 + return err;
2627 +}
2628 +
2629 +
2630 +STATIC int
2631 +mini_fo_rmdir(inode_t *dir, dentry_t *dentry)
2632 +{
2633 + int err = 0;
2634 +
2635 + dentry_t *hidden_sto_dentry;
2636 + dentry_t *hidden_sto_dir_dentry;
2637 + dentry_t *meta_dentry;
2638 + inode_t *hidden_sto_dir = NULL;
2639 +
2640 + check_mini_fo_dentry(dentry);
2641 + check_mini_fo_inode(dir);
2642 +
2643 + dget(dentry);
2644 + if(dtopd(dentry)->state == MODIFIED) {
2645 + /* XXX: disabled, because it does not bother to check files on
2646 + * the original filesystem - just a hack, but better than simply
2647 + * removing it without testing */
2648 + err = -EINVAL;
2649 + goto out;
2650 +
2651 + hidden_sto_dir = itohi2(dir);
2652 + hidden_sto_dentry = dtohd2(dentry);
2653 +
2654 + /* was:hidden_sto_dir_dentry = lock_parent(hidden_sto_dentry); */
2655 + hidden_sto_dir_dentry = dget(hidden_sto_dentry->d_parent);
2656 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
2657 + mutex_lock(&hidden_sto_dir_dentry->d_inode->i_mutex);
2658 +#else
2659 + down(&hidden_sto_dir_dentry->d_inode->i_sem);
2660 +#endif
2661 +
2662 + /* Delete an old WOL file contained in the storage dir */
2663 + meta_dentry = lookup_one_len(META_FILENAME,
2664 + hidden_sto_dentry,
2665 + strlen(META_FILENAME));
2666 + if(meta_dentry->d_inode) {
2667 + err = vfs_unlink(hidden_sto_dentry->d_inode, meta_dentry);
2668 + dput(meta_dentry);
2669 + if(!err)
2670 + d_delete(meta_dentry);
2671 + }
2672 +
2673 + err = vfs_rmdir(hidden_sto_dir, hidden_sto_dentry);
2674 + dput(hidden_sto_dentry);
2675 + if(!err)
2676 + d_delete(hidden_sto_dentry);
2677 +
2678 + /* propagate number of hard-links */
2679 + dentry->d_inode->i_nlink = itohi2(dentry->d_inode)->i_nlink;
2680 +
2681 + dput(dtohd(dentry));
2682 +
2683 + dtohd(dentry) = NULL;
2684 + dtopd(dentry)->state = DELETED;
2685 +
2686 + /* carefull with R files */
2687 + if( __meta_is_r_entry(dir,
2688 + dentry->d_name.name,
2689 + dentry->d_name.len) == 1) {
2690 + err = meta_remove_r_entry(dentry->d_parent,
2691 + dentry->d_name.name,
2692 + dentry->d_name.len);
2693 + if(err) {
2694 + printk(KERN_CRIT "mini_fo: rmdir: meta_remove_r_entry failed.\n");
2695 + goto out;
2696 + }
2697 + }
2698 + else {
2699 + /* ok, add deleted file to META */
2700 + meta_add_d_entry(dentry->d_parent,
2701 + dentry->d_name.name,
2702 + dentry->d_name.len);
2703 + }
2704 + /* was: unlock_dir(hidden_sto_dir_dentry); */
2705 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
2706 + mutex_unlock(&hidden_sto_dir_dentry->d_inode->i_mutex);
2707 +#else
2708 + up(&hidden_sto_dir_dentry->d_inode->i_sem);
2709 +#endif
2710 + dput(hidden_sto_dir_dentry);
2711 + goto out;
2712 + }
2713 + else if(dtopd(dentry)->state == UNMODIFIED) {
2714 + /* XXX: simply adding it to the delete list here is fscking dangerous!
2715 + * as a temporary hack, i will disable rmdir on unmodified directories
2716 + * for now.
2717 + */
2718 + err = -EINVAL;
2719 + goto out;
2720 +
2721 + err = get_neg_sto_dentry(dentry);
2722 + if(err) {
2723 + err = -EINVAL;
2724 + goto out;
2725 + }
2726 +
2727 + /* dput base dentry, this will relase the inode and free the
2728 + * dentry, as we will never need it again. */
2729 + dput(dtohd(dentry));
2730 + dtohd(dentry) = NULL;
2731 + dtopd(dentry)->state = DELETED;
2732 +
2733 + /* add deleted file to META-file */
2734 + meta_add_d_entry(dentry->d_parent,
2735 + dentry->d_name.name,
2736 + dentry->d_name.len);
2737 + goto out;
2738 + }
2739 + else if(dtopd(dentry)->state == CREATED) {
2740 + hidden_sto_dir = itohi2(dir);
2741 + hidden_sto_dentry = dtohd2(dentry);
2742 +
2743 + /* was: hidden_sto_dir_dentry = lock_parent(hidden_sto_dentry);*/
2744 + hidden_sto_dir_dentry = dget(hidden_sto_dentry->d_parent);
2745 +
2746 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
2747 + mutex_lock(&hidden_sto_dir_dentry->d_inode->i_mutex);
2748 +#else
2749 + down(&hidden_sto_dir_dentry->d_inode->i_sem);
2750 +#endif
2751 +
2752 + /* Delete an old WOL file contained in the storage dir */
2753 + meta_dentry = lookup_one_len(META_FILENAME,
2754 + hidden_sto_dentry,
2755 + strlen(META_FILENAME));
2756 + if(meta_dentry->d_inode) {
2757 + /* is this necessary? dget(meta_dentry); */
2758 + err = vfs_unlink(hidden_sto_dentry->d_inode,
2759 + meta_dentry);
2760 + dput(meta_dentry);
2761 + if(!err)
2762 + d_delete(meta_dentry);
2763 + }
2764 +
2765 + err = vfs_rmdir(hidden_sto_dir, hidden_sto_dentry);
2766 + dput(hidden_sto_dentry);
2767 + if(!err)
2768 + d_delete(hidden_sto_dentry);
2769 +
2770 + /* propagate number of hard-links */
2771 + dentry->d_inode->i_nlink = itohi2(dentry->d_inode)->i_nlink;
2772 + dtopd(dentry)->state = NON_EXISTANT;
2773 +
2774 + /* was: unlock_dir(hidden_sto_dir_dentry); */
2775 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
2776 + mutex_unlock(&hidden_sto_dir_dentry->d_inode->i_mutex);
2777 +#else
2778 + up(&hidden_sto_dir_dentry->d_inode->i_sem);
2779 +#endif
2780 + dput(hidden_sto_dir_dentry);
2781 +
2782 + goto out;
2783 + }
2784 + else if(dtopd(dentry)->state == DEL_REWRITTEN) {
2785 + hidden_sto_dir = itohi2(dir);
2786 + hidden_sto_dentry = dtohd2(dentry);
2787 +
2788 + /* was: hidden_sto_dir_dentry = lock_parent(hidden_sto_dentry);*/
2789 + hidden_sto_dir_dentry = dget(hidden_sto_dentry->d_parent);
2790 +
2791 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
2792 + mutex_lock(&hidden_sto_dir_dentry->d_inode->i_mutex);
2793 +#else
2794 + down(&hidden_sto_dir_dentry->d_inode->i_sem);
2795 +#endif
2796 +
2797 + /* Delete an old WOL file contained in the storage dir */
2798 + meta_dentry = lookup_one_len(META_FILENAME,
2799 + hidden_sto_dentry,
2800 + strlen(META_FILENAME));
2801 + if(meta_dentry->d_inode) {
2802 + /* is this necessary? dget(meta_dentry); */
2803 + err = vfs_unlink(hidden_sto_dentry->d_inode,
2804 + meta_dentry);
2805 + dput(meta_dentry);
2806 + if(!err)
2807 + d_delete(meta_dentry);
2808 + }
2809 +
2810 + err = vfs_rmdir(hidden_sto_dir, hidden_sto_dentry);
2811 + dput(hidden_sto_dentry);
2812 + if(!err)
2813 + d_delete(hidden_sto_dentry);
2814 +
2815 + /* propagate number of hard-links */
2816 + dentry->d_inode->i_nlink = itohi2(dentry->d_inode)->i_nlink;
2817 + dtopd(dentry)->state = DELETED;
2818 + /* was: unlock_dir(hidden_sto_dir_dentry); */
2819 +
2820 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
2821 + mutex_unlock(&hidden_sto_dir_dentry->d_inode->i_mutex);
2822 +#else
2823 + up(&hidden_sto_dir_dentry->d_inode->i_sem);
2824 +#endif
2825 + dput(hidden_sto_dir_dentry);
2826 + goto out;
2827 + }
2828 +
2829 + printk(KERN_CRIT "mini_fo_rmdir: ERROR, invalid state detected.\n");
2830 +
2831 + out:
2832 + if(!err) {
2833 + d_drop(dentry);
2834 + }
2835 +
2836 + fist_copy_attr_times(dir, itohi2(dentry->d_parent->d_inode));
2837 + dput(dentry);
2838 +
2839 + return err;
2840 +}
2841 +
2842 +
2843 +STATIC int
2844 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
2845 +mini_fo_mknod(inode_t *dir, dentry_t *dentry, int mode, dev_t dev)
2846 +#else
2847 +mini_fo_mknod(inode_t *dir, dentry_t *dentry, int mode, int dev)
2848 +#endif
2849 +{
2850 + int err = 0;
2851 +
2852 + check_mini_fo_dentry(dentry);
2853 +
2854 + err = create_sto_nod(dentry, mode, dev);
2855 + if(err) {
2856 + printk(KERN_CRIT "mini_fo_mknod: creating sto nod failed.\n");
2857 + err = -EINVAL;
2858 + }
2859 +
2860 + check_mini_fo_dentry(dentry);
2861 + return err;
2862 +}
2863 +
2864 +
2865 +STATIC int
2866 +mini_fo_rename(inode_t *old_dir, dentry_t *old_dentry,
2867 + inode_t *new_dir, dentry_t *new_dentry)
2868 +{
2869 + /* dispatch */
2870 + if(S_ISDIR(old_dentry->d_inode->i_mode))
2871 + return rename_directory(old_dir, old_dentry, new_dir, new_dentry);
2872 + return rename_nondir(old_dir, old_dentry, new_dir, new_dentry);
2873 +
2874 +}
2875 +
2876 +int rename_directory(inode_t *old_dir, dentry_t *old_dentry,
2877 + inode_t *new_dir, dentry_t *new_dentry)
2878 +{
2879 + int err, bpath_len;
2880 + char *bpath;
2881 +
2882 + dentry_t *hidden_old_dentry;
2883 + dentry_t *hidden_new_dentry;
2884 + dentry_t *hidden_old_dir_dentry;
2885 + dentry_t *hidden_new_dir_dentry;
2886 +
2887 + err = 0;
2888 + bpath = NULL;
2889 + bpath_len = 0;
2890 +
2891 + /* this is a test, chuck out if it works */
2892 + if(!(dtopd(new_dentry)->state == DELETED ||
2893 + dtopd(new_dentry)->state == NON_EXISTANT)) {
2894 + printk(KERN_CRIT "mini_fo: rename_directory: \
2895 + uh, ah, new_dentry not negative.\n");
2896 + /* return -1; */
2897 + }
2898 +
2899 + /* state = UNMODIFIED */
2900 + if(dtopd(old_dentry)->state == UNMODIFIED) {
2901 + err = dir_unmod_to_mod(old_dentry);
2902 + if (err)
2903 + goto out;
2904 + }
2905 +
2906 + /* state = MODIFIED */
2907 + if(dtopd(old_dentry)->state == MODIFIED) {
2908 + bpath = meta_check_r_entry(old_dentry->d_parent,
2909 + old_dentry->d_name.name,
2910 + old_dentry->d_name.len);
2911 + if(bpath) {
2912 + err = meta_remove_r_entry(old_dentry->d_parent,
2913 + old_dentry->d_name.name,
2914 + old_dentry->d_name.len);
2915 + if(err) {
2916 + printk(KERN_CRIT "mini_fo: rename_directory:\
2917 + meta_remove_r_entry \
2918 + failed.\n");
2919 + goto out;
2920 + }
2921 + err = meta_add_r_entry(new_dentry->d_parent,
2922 + bpath,
2923 + strlen(bpath),
2924 + new_dentry->d_name.name,
2925 + new_dentry->d_name.len);
2926 + kfree(bpath);
2927 + }
2928 + else {/* wol it */
2929 + err = meta_add_d_entry(old_dentry->d_parent,
2930 + old_dentry->d_name.name,
2931 + old_dentry->d_name.len);
2932 + if (err)
2933 + goto out;
2934 + /* put it on rename list */
2935 + err = get_mini_fo_bpath(old_dentry,
2936 + &bpath,
2937 + &bpath_len);
2938 + if (err)
2939 + goto out;
2940 + err = meta_add_r_entry(new_dentry->d_parent,
2941 + bpath, bpath_len,
2942 + new_dentry->d_name.name,
2943 + new_dentry->d_name.len);
2944 + if (err)
2945 + goto out;
2946 + }
2947 + /* no state change, MODIFIED stays MODIFIED */
2948 + }
2949 + /* state = CREATED */
2950 + if(dtopd(old_dentry)->state == CREATED ||
2951 + dtopd(old_dentry)->state == DEL_REWRITTEN) {
2952 + if(dtohd(old_dentry))
2953 + dput(dtohd(old_dentry));
2954 +
2955 + if(dtopd(new_dentry)->state == DELETED) {
2956 + dtopd(old_dentry)->state = DEL_REWRITTEN;
2957 + dtohd(old_dentry) = NULL;
2958 + }
2959 + else if(dtopd(new_dentry)->state == NON_EXISTANT) {
2960 + dtopd(old_dentry)->state = CREATED;
2961 + /* steal new dentry's neg. base dentry */
2962 + dtohd(old_dentry) = dtohd(new_dentry);
2963 + dtohd(new_dentry) = NULL;
2964 + }
2965 + }
2966 + if(dtopd(new_dentry)->state == UNMODIFIED ||
2967 + dtopd(new_dentry)->state == NON_EXISTANT) {
2968 + err = get_neg_sto_dentry(new_dentry);
2969 + if(err)
2970 + goto out;
2971 + }
2972 +
2973 + /* now move sto file */
2974 + hidden_old_dentry = dtohd2(old_dentry);
2975 + hidden_new_dentry = dtohd2(new_dentry);
2976 +
2977 + dget(hidden_old_dentry);
2978 + dget(hidden_new_dentry);
2979 +
2980 + hidden_old_dir_dentry = dget(hidden_old_dentry->d_parent);
2981 + hidden_new_dir_dentry = dget(hidden_new_dentry->d_parent);
2982 + double_lock(hidden_old_dir_dentry, hidden_new_dir_dentry);
2983 +
2984 + err = vfs_rename(hidden_old_dir_dentry->d_inode, hidden_old_dentry,
2985 + hidden_new_dir_dentry->d_inode, hidden_new_dentry);
2986 + if(err)
2987 + goto out_lock;
2988 +
2989 + fist_copy_attr_all(new_dir, hidden_new_dir_dentry->d_inode);
2990 + if (new_dir != old_dir)
2991 + fist_copy_attr_all(old_dir,
2992 + hidden_old_dir_dentry->d_inode);
2993 +
2994 + out_lock:
2995 + /* double_unlock will dput the new/old parent dentries
2996 + * whose refcnts were incremented via get_parent above. */
2997 + double_unlock(hidden_old_dir_dentry, hidden_new_dir_dentry);
2998 + dput(hidden_new_dentry);
2999 + dput(hidden_old_dentry);
3000 +
3001 + out:
3002 + return err;
3003 +}
3004 +
3005 +int rename_nondir(inode_t *old_dir, dentry_t *old_dentry,
3006 + inode_t *new_dir, dentry_t *new_dentry)
3007 +{
3008 + int err=0;
3009 +
3010 + check_mini_fo_dentry(old_dentry);
3011 + check_mini_fo_dentry(new_dentry);
3012 + check_mini_fo_inode(old_dir);
3013 + check_mini_fo_inode(new_dir);
3014 +
3015 + /* state: UNMODIFIED */
3016 + if(dtost(old_dentry) == UNMODIFIED) {
3017 + err = nondir_unmod_to_mod(old_dentry, 1);
3018 + if(err) {
3019 + err = -EINVAL;
3020 + goto out;
3021 + }
3022 + }
3023 +
3024 + /* the easy states */
3025 + if(exists_in_storage(old_dentry)) {
3026 +
3027 + dentry_t *hidden_old_dentry;
3028 + dentry_t *hidden_new_dentry;
3029 + dentry_t *hidden_old_dir_dentry;
3030 + dentry_t *hidden_new_dir_dentry;
3031 +
3032 + /* if old file is MODIFIED, add it to the deleted_list */
3033 + if(dtopd(old_dentry)->state == MODIFIED) {
3034 + meta_add_d_entry(old_dentry->d_parent,
3035 + old_dentry->d_name.name,
3036 + old_dentry->d_name.len);
3037 +
3038 + dput(dtohd(old_dentry));
3039 + }
3040 + /* if old file is CREATED, we only release the base dentry */
3041 + if(dtopd(old_dentry)->state == CREATED) {
3042 + if(dtohd(old_dentry))
3043 + dput(dtohd(old_dentry));
3044 + }
3045 +
3046 + /* now setup the new states (depends on new_dentry state) */
3047 + /* new dentry state = MODIFIED */
3048 + if(dtopd(new_dentry)->state == MODIFIED) {
3049 + meta_add_d_entry(new_dentry->d_parent,
3050 + new_dentry->d_name.name,
3051 + new_dentry->d_name.len);
3052 +
3053 + /* new dentry will be d_put'ed later by the vfs
3054 + * so don't do it here
3055 + * dput(dtohd(new_dentry));
3056 + */
3057 + dtohd(old_dentry) = NULL;
3058 + dtopd(old_dentry)->state = DEL_REWRITTEN;
3059 + }
3060 + /* new dentry state = UNMODIFIED */
3061 + else if(dtopd(new_dentry)->state == UNMODIFIED) {
3062 + if(get_neg_sto_dentry(new_dentry))
3063 + return -EINVAL;
3064 +
3065 + meta_add_d_entry(new_dentry->d_parent,
3066 + new_dentry->d_name.name,
3067 + new_dentry->d_name.len);
3068 +
3069 + /* is this right??? */
3070 + /*dput(dtohd(new_dentry));*/
3071 + dtohd(old_dentry) = NULL;
3072 + dtopd(old_dentry)->state = DEL_REWRITTEN;
3073 + }
3074 + /* new dentry state = CREATED */
3075 + else if(dtopd(new_dentry)->state == CREATED) {
3076 + /* we keep the neg. base dentry (if exists) */
3077 + dtohd(old_dentry) = dtohd(new_dentry);
3078 + /* ...and set it to Null, or we'll get
3079 + * dcache.c:345 if it gets dput twice... */
3080 + dtohd(new_dentry) = NULL;
3081 + dtopd(old_dentry)->state = CREATED;
3082 + }
3083 + /* new dentry state = NON_EXISTANT */
3084 + else if(dtopd(new_dentry)->state == NON_EXISTANT) {
3085 + if(get_neg_sto_dentry(new_dentry))
3086 + return -EINVAL;
3087 +
3088 + /* we keep the neg. base dentry (if exists) */
3089 + dtohd(old_dentry) = dtohd(new_dentry);
3090 + /* ...and set it to Null, or we'll get
3091 + * Dr. dcache.c:345 if it gets dput twice... */
3092 + dtohd(new_dentry) = NULL;
3093 + dtopd(old_dentry)->state = CREATED;
3094 + }
3095 + /* new dentry state = DEL_REWRITTEN or DELETED */
3096 + else if(dtopd(new_dentry)->state == DEL_REWRITTEN ||
3097 + dtopd(new_dentry)->state == DELETED) {
3098 + dtohd(old_dentry) = NULL;
3099 + dtopd(old_dentry)->state = DEL_REWRITTEN;
3100 + }
3101 + else { /* not possible, uhh, ahh */
3102 + printk(KERN_CRIT
3103 + "mini_fo: rename_reg_file: invalid state detected [1].\n");
3104 + return -1;
3105 + }
3106 +
3107 + /* now we definitely have a sto file */
3108 + hidden_old_dentry = dtohd2(old_dentry);
3109 + hidden_new_dentry = dtohd2(new_dentry);
3110 +
3111 + dget(hidden_old_dentry);
3112 + dget(hidden_new_dentry);
3113 +
3114 + hidden_old_dir_dentry = dget(hidden_old_dentry->d_parent);
3115 + hidden_new_dir_dentry = dget(hidden_new_dentry->d_parent);
3116 + double_lock(hidden_old_dir_dentry, hidden_new_dir_dentry);
3117 +
3118 + err = vfs_rename(hidden_old_dir_dentry->d_inode,
3119 + hidden_old_dentry,
3120 + hidden_new_dir_dentry->d_inode,
3121 + hidden_new_dentry);
3122 + if(err)
3123 + goto out_lock;
3124 +
3125 + fist_copy_attr_all(new_dir, hidden_new_dir_dentry->d_inode);
3126 + if (new_dir != old_dir)
3127 + fist_copy_attr_all(old_dir, hidden_old_dir_dentry->d_inode);
3128 +
3129 + out_lock:
3130 + /* double_unlock will dput the new/old parent dentries
3131 + * whose refcnts were incremented via get_parent above.
3132 + */
3133 + double_unlock(hidden_old_dir_dentry, hidden_new_dir_dentry);
3134 + dput(hidden_new_dentry);
3135 + dput(hidden_old_dentry);
3136 + out:
3137 + return err;
3138 + }
3139 + else { /* invalid state */
3140 + printk(KERN_CRIT "mini_fo: rename_reg_file: ERROR: invalid state detected [2].\n");
3141 + return -1;
3142 + }
3143 +}
3144 +
3145 +
3146 +STATIC int
3147 +mini_fo_readlink(dentry_t *dentry, char *buf, int bufsiz)
3148 +{
3149 + int err=0;
3150 + dentry_t *hidden_dentry = NULL;
3151 +
3152 + if(dtohd2(dentry) && dtohd2(dentry)->d_inode) {
3153 + hidden_dentry = dtohd2(dentry);
3154 + } else if(dtohd(dentry) && dtohd(dentry)->d_inode) {
3155 + hidden_dentry = dtohd(dentry);
3156 + } else {
3157 + goto out;
3158 + }
3159 +
3160 + if (!hidden_dentry->d_inode->i_op ||
3161 + !hidden_dentry->d_inode->i_op->readlink) {
3162 + err = -EINVAL; goto out;
3163 + }
3164 +
3165 + err = hidden_dentry->d_inode->i_op->readlink(hidden_dentry,
3166 + buf,
3167 + bufsiz);
3168 + if (err > 0)
3169 + fist_copy_attr_atime(dentry->d_inode, hidden_dentry->d_inode);
3170 +
3171 + out:
3172 + return err;
3173 +}
3174 +
3175 +
3176 +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,13)
3177 +static int mini_fo_follow_link(dentry_t *dentry, struct nameidata *nd)
3178 +#else
3179 +static void* mini_fo_follow_link(dentry_t *dentry, struct nameidata *nd)
3180 +#endif
3181 +{
3182 + char *buf;
3183 + int len = PAGE_SIZE, err;
3184 + mm_segment_t old_fs;
3185 +
3186 + /* in 2.6 this is freed by mini_fo_put_link called by __do_follow_link */
3187 + buf = kmalloc(len, GFP_KERNEL);
3188 + if (!buf) {
3189 + err = -ENOMEM;
3190 + goto out;
3191 + }
3192 +
3193 + /* read the symlink, and then we will follow it */
3194 + old_fs = get_fs();
3195 + set_fs(KERNEL_DS);
3196 + err = dentry->d_inode->i_op->readlink(dentry, buf, len);
3197 + set_fs(old_fs);
3198 + if (err < 0) {
3199 + kfree(buf);
3200 + buf = NULL;
3201 + goto out;
3202 + }
3203 + buf[err] = 0;
3204 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
3205 + nd_set_link(nd, buf);
3206 + err = 0;
3207 +#else
3208 + err = vfs_follow_link(nd, buf);
3209 +#endif
3210 +
3211 + out:
3212 +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
3213 + kfree(buf);
3214 +#endif
3215 +
3216 +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,13)
3217 + return err;
3218 +#else
3219 + return ERR_PTR(err);
3220 +#endif
3221 +}
3222 +
3223 +STATIC
3224 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
3225 +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,13)
3226 +void mini_fo_put_link(struct dentry *dentry, struct nameidata *nd)
3227 +#else
3228 +void mini_fo_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie)
3229 +#endif
3230 +{
3231 + char *link;
3232 + link = nd_get_link(nd);
3233 + kfree(link);
3234 +}
3235 +#endif
3236 +
3237 +STATIC int
3238 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
3239 +mini_fo_permission(inode_t *inode, int mask, struct nameidata *nd)
3240 +#else
3241 +mini_fo_permission(inode_t *inode, int mask)
3242 +#endif
3243 +{
3244 + inode_t *hidden_inode;
3245 + int mode;
3246 + int err;
3247 +
3248 + if(itohi2(inode)) {
3249 + hidden_inode = itohi2(inode);
3250 + } else {
3251 + hidden_inode = itohi(inode);
3252 + }
3253 + mode = inode->i_mode;
3254 +
3255 + /* not really needed, as permission handles everything:
3256 + * err = vfs_permission(inode, mask);
3257 + * if (err)
3258 + * goto out;
3259 + */
3260 +
3261 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
3262 + err = permission(hidden_inode, mask, nd);
3263 +#else
3264 + err = permission(hidden_inode, mask);
3265 +#endif
3266 +
3267 + /* out: */
3268 + return err;
3269 +}
3270 +
3271 +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
3272 +STATIC int
3273 +mini_fo_inode_revalidate(dentry_t *dentry)
3274 +{
3275 + int err = 0;
3276 + dentry_t *hidden_dentry;
3277 + inode_t *hidden_inode;
3278 +
3279 + ASSERT(dentry->d_inode);
3280 + ASSERT(itopd(dentry->d_inode));
3281 +
3282 + if(itohi2(dentry->d_inode)) {
3283 + hidden_dentry = dtohd2(dentry);
3284 + hidden_inode = hidden_dentry->d_inode;
3285 + } else if(itohi(dentry->d_inode)) {
3286 + hidden_dentry = dtohd(dentry);
3287 + hidden_inode = hidden_dentry->d_inode;
3288 + } else {
3289 + printk(KERN_CRIT "mini_fo_inode_revalidate: ERROR, invalid state detected.\n");
3290 + err = -ENOENT;
3291 + goto out;
3292 + }
3293 + if (hidden_inode && hidden_inode->i_op && hidden_inode->i_op->revalidate){
3294 + err = hidden_inode->i_op->revalidate(hidden_dentry);
3295 + if (err)
3296 + goto out;
3297 + }
3298 + fist_copy_attr_all(dentry->d_inode, hidden_inode);
3299 + out:
3300 + return err;
3301 +}
3302 +#endif
3303 +
3304 +STATIC int
3305 +mini_fo_setattr(dentry_t *dentry, struct iattr *ia)
3306 +{
3307 + int err = 0;
3308 +
3309 + check_mini_fo_dentry(dentry);
3310 +
3311 + if(!is_mini_fo_existant(dentry)) {
3312 + printk(KERN_CRIT "mini_fo_setattr: ERROR, invalid state detected [1].\n");
3313 + goto out;
3314 + }
3315 +
3316 + if(dtost(dentry) == UNMODIFIED) {
3317 + if(!IS_COPY_FLAG(ia->ia_valid))
3318 + goto out; /* we ignore these changes to base */
3319 +
3320 + if(S_ISDIR(dentry->d_inode->i_mode)) {
3321 + err = dir_unmod_to_mod(dentry);
3322 + } else {
3323 + /* we copy contents if file is not beeing truncated */
3324 + if(S_ISREG(dentry->d_inode->i_mode) &&
3325 + !(ia->ia_size == 0 && (ia->ia_valid & ATTR_SIZE))) {
3326 + err = nondir_unmod_to_mod(dentry, 1);
3327 + } else
3328 + err = nondir_unmod_to_mod(dentry, 0);
3329 + }
3330 + if(err) {
3331 + err = -EINVAL;
3332 + printk(KERN_CRIT "mini_fo_setattr: ERROR changing states.\n");
3333 + goto out;
3334 + }
3335 + }
3336 + if(!exists_in_storage(dentry)) {
3337 + printk(KERN_CRIT "mini_fo_setattr: ERROR, invalid state detected [2].\n");
3338 + err = -EINVAL;
3339 + goto out;
3340 + }
3341 + ASSERT(dentry->d_inode);
3342 + ASSERT(dtohd2(dentry));
3343 + ASSERT(itopd(dentry->d_inode));
3344 + ASSERT(itohi2(dentry->d_inode));
3345 +
3346 + err = notify_change(dtohd2(dentry), ia);
3347 + fist_copy_attr_all(dentry->d_inode, itohi2(dentry->d_inode));
3348 + out:
3349 + return err;
3350 +}
3351 +
3352 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
3353 +STATIC int
3354 +mini_fo_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
3355 +{
3356 + int err = 0;
3357 + dentry_t *hidden_dentry;
3358 +
3359 + ASSERT(dentry->d_inode);
3360 + ASSERT(itopd(dentry->d_inode));
3361 +
3362 + if(itohi2(dentry->d_inode)) {
3363 + hidden_dentry = dtohd2(dentry);
3364 + } else if(itohi(dentry->d_inode)) {
3365 + hidden_dentry = dtohd(dentry);
3366 + } else {
3367 + printk(KERN_CRIT "mini_fo_getattr: ERROR, invalid state detected.\n");
3368 + err = -ENOENT;
3369 + goto out;
3370 + }
3371 + fist_copy_attr_all(dentry->d_inode, hidden_dentry->d_inode);
3372 +
3373 + ASSERT(hidden_dentry);
3374 + ASSERT(hidden_dentry->d_inode);
3375 + ASSERT(hidden_dentry->d_inode->i_op);
3376 +
3377 + generic_fillattr(dentry->d_inode, stat);
3378 + if (!stat->blksize) {
3379 + struct super_block *s = hidden_dentry->d_inode->i_sb;
3380 + unsigned blocks;
3381 + blocks = (stat->size+s->s_blocksize-1) >> s->s_blocksize_bits;
3382 + stat->blocks = (s->s_blocksize / 512) * blocks;
3383 + stat->blksize = s->s_blocksize;
3384 + }
3385 + out:
3386 + return err;
3387 +}
3388 +#endif
3389 +
3390 +#if defined(XATTR) && (LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,20))
3391 +#if 0 /* no xattr_alloc() and xattr_free() */
3392 +/* This is lifted from fs/xattr.c */
3393 +static void *
3394 +xattr_alloc(size_t size, size_t limit)
3395 +{
3396 + void *ptr;
3397 +
3398 + if (size > limit)
3399 + return ERR_PTR(-E2BIG);
3400 +
3401 + if (!size) /* size request, no buffer is needed */
3402 + return NULL;
3403 + else if (size <= PAGE_SIZE)
3404 + ptr = kmalloc((unsigned long) size, GFP_KERNEL);
3405 + else
3406 + ptr = vmalloc((unsigned long) size);
3407 + if (!ptr)
3408 + return ERR_PTR(-ENOMEM);
3409 + return ptr;
3410 +}
3411 +
3412 +static void
3413 +xattr_free(void *ptr, size_t size)
3414 +{
3415 + if (!size) /* size request, no buffer was needed */
3416 + return;
3417 + else if (size <= PAGE_SIZE)
3418 + kfree(ptr);
3419 + else
3420 + vfree(ptr);
3421 +}
3422 +#endif /* no xattr_alloc() and xattr_free() */
3423 +
3424 +/* BKL held by caller.
3425 + * dentry->d_inode->i_sem down
3426 + */
3427 +STATIC int
3428 +mini_fo_getxattr(struct dentry *dentry, const char *name, void *value, size_t size) {
3429 + struct dentry *hidden_dentry = NULL;
3430 + int err = -EOPNOTSUPP;
3431 + /* Define these anyway so we don't need as much ifdef'ed code. */
3432 + char *encoded_name = NULL;
3433 + char *encoded_value = NULL;
3434 +
3435 + check_mini_fo_dentry(dentry);
3436 +
3437 + if(exists_in_storage(dentry))
3438 + hidden_dentry = dtohd2(dentry);
3439 + else
3440 + hidden_dentry = dtohd(dentry);
3441 +
3442 + ASSERT(hidden_dentry);
3443 + ASSERT(hidden_dentry->d_inode);
3444 + ASSERT(hidden_dentry->d_inode->i_op);
3445 +
3446 + if (hidden_dentry->d_inode->i_op->getxattr) {
3447 + encoded_name = (char *)name;
3448 + encoded_value = (char *)value;
3449 +
3450 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
3451 + mutex_lock(&hidden_dentry->d_inode->i_mutex);
3452 +#else
3453 + down(&hidden_dentry->d_inode->i_sem);
3454 +#endif
3455 + /* lock_kernel() already done by caller. */
3456 + err = hidden_dentry->d_inode->i_op->getxattr(hidden_dentry, encoded_name, encoded_value, size);
3457 + /* unlock_kernel() will be done by caller. */
3458 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
3459 + mutex_lock(&hidden_dentry->d_inode->i_mutex);
3460 +#else
3461 + up(&hidden_dentry->d_inode->i_sem);
3462 +#endif
3463 + }
3464 + return err;
3465 +}
3466 +
3467 +/* BKL held by caller.
3468 + * dentry->d_inode->i_sem down
3469 + */
3470 +STATIC int
3471 +#if ((LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,21) \
3472 + && LINUX_VERSION_CODE <= KERNEL_VERSION(2,4,23)) \
3473 + || LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0))
3474 +mini_fo_setxattr(struct dentry *dentry, const char *name,
3475 + const void *value, size_t size, int flags)
3476 +#else
3477 +mini_fo_setxattr(struct dentry *dentry, const char *name,
3478 + void *value, size_t size, int flags)
3479 +#endif
3480 +
3481 +{
3482 + struct dentry *hidden_dentry = NULL;
3483 + int err = -EOPNOTSUPP;
3484 +
3485 + /* Define these anyway, so we don't have as much ifdef'ed code. */
3486 + char *encoded_value = NULL;
3487 + char *encoded_name = NULL;
3488 +
3489 + check_mini_fo_dentry(dentry);
3490 +
3491 + if(exists_in_storage(dentry))
3492 + hidden_dentry = dtohd2(dentry);
3493 + else
3494 + hidden_dentry = dtohd(dentry);
3495 +
3496 + ASSERT(hidden_dentry);
3497 + ASSERT(hidden_dentry->d_inode);
3498 + ASSERT(hidden_dentry->d_inode->i_op);
3499 +
3500 + if (hidden_dentry->d_inode->i_op->setxattr) {
3501 + encoded_na