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[openwrt.git] / target / linux / generic-2.6 / files / fs / yaffs2 / yaffs_fs.c
1 /*
2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
3 *
4 * Copyright (C) 2002-2007 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
6 *
7 * Created by Charles Manning <charles@aleph1.co.uk>
8 * Acknowledgements:
9 * Luc van OostenRyck for numerous patches.
10 * Nick Bane for numerous patches.
11 * Nick Bane for 2.5/2.6 integration.
12 * Andras Toth for mknod rdev issue.
13 * Michael Fischer for finding the problem with inode inconsistency.
14 * Some code bodily lifted from JFFS
15 *
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License version 2 as
18 * published by the Free Software Foundation.
19 */
20
21 /*
22 *
23 * This is the file system front-end to YAFFS that hooks it up to
24 * the VFS.
25 *
26 * Special notes:
27 * >> 2.4: sb->u.generic_sbp points to the yaffs_Device associated with
28 * this superblock
29 * >> 2.6: sb->s_fs_info points to the yaffs_Device associated with this
30 * superblock
31 * >> inode->u.generic_ip points to the associated yaffs_Object.
32 */
33
34 const char *yaffs_fs_c_version =
35 "$Id: yaffs_fs.c,v 1.63 2007-09-19 20:35:40 imcd Exp $";
36 extern const char *yaffs_guts_c_version;
37
38 #include <linux/version.h>
39 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19))
40 #include <linux/config.h>
41 #endif
42 #include <linux/kernel.h>
43 #include <linux/module.h>
44 #include <linux/slab.h>
45 #include <linux/init.h>
46 #include <linux/list.h>
47 #include <linux/fs.h>
48 #include <linux/proc_fs.h>
49 #include <linux/smp_lock.h>
50 #include <linux/pagemap.h>
51 #include <linux/mtd/mtd.h>
52 #include <linux/interrupt.h>
53 #include <linux/string.h>
54 #include <linux/ctype.h>
55
56 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
57
58 #include <linux/statfs.h> /* Added NCB 15-8-2003 */
59 #include <asm/statfs.h>
60 #define UnlockPage(p) unlock_page(p)
61 #define Page_Uptodate(page) test_bit(PG_uptodate, &(page)->flags)
62
63 /* FIXME: use sb->s_id instead ? */
64 #define yaffs_devname(sb, buf) bdevname(sb->s_bdev, buf)
65
66 #else
67
68 #include <linux/locks.h>
69 #define BDEVNAME_SIZE 0
70 #define yaffs_devname(sb, buf) kdevname(sb->s_dev)
71
72 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
73 /* added NCB 26/5/2006 for 2.4.25-vrs2-tcl1 kernel */
74 #define __user
75 #endif
76
77 #endif
78
79 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
80 #define WRITE_SIZE_STR "writesize"
81 #define WRITE_SIZE(mtd) (mtd)->writesize
82 #else
83 #define WRITE_SIZE_STR "oobblock"
84 #define WRITE_SIZE(mtd) (mtd)->oobblock
85 #endif
86
87 #include <asm/uaccess.h>
88
89 #include "yportenv.h"
90 #include "yaffs_guts.h"
91
92 #include <linux/mtd/mtd.h>
93 #include "yaffs_mtdif.h"
94 #include "yaffs_mtdif1.h"
95 #include "yaffs_mtdif2.h"
96
97 unsigned int yaffs_traceMask = YAFFS_TRACE_BAD_BLOCKS;
98 unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS;
99
100 /* Module Parameters */
101 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
102 module_param(yaffs_traceMask,uint,0644);
103 module_param(yaffs_wr_attempts,uint,0644);
104 #else
105 MODULE_PARM(yaffs_traceMask,"i");
106 MODULE_PARM(yaffs_wr_attempts,"i");
107 #endif
108
109 /*#define T(x) printk x */
110
111 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18))
112 #define yaffs_InodeToObjectLV(iptr) (iptr)->i_private
113 #else
114 #define yaffs_InodeToObjectLV(iptr) (iptr)->u.generic_ip
115 #endif
116
117 #define yaffs_InodeToObject(iptr) ((yaffs_Object *)(yaffs_InodeToObjectLV(iptr)))
118 #define yaffs_DentryToObject(dptr) yaffs_InodeToObject((dptr)->d_inode)
119
120 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
121 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->s_fs_info)
122 #else
123 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->u.generic_sbp)
124 #endif
125
126 static void yaffs_put_super(struct super_block *sb);
127
128 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
129 loff_t * pos);
130
131 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
132 static int yaffs_file_flush(struct file *file, fl_owner_t id);
133 #else
134 static int yaffs_file_flush(struct file *file);
135 #endif
136
137 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
138 int datasync);
139
140 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
141
142 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
143 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
144 struct nameidata *n);
145 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
146 struct nameidata *n);
147 #else
148 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode);
149 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry);
150 #endif
151 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
152 struct dentry *dentry);
153 static int yaffs_unlink(struct inode *dir, struct dentry *dentry);
154 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
155 const char *symname);
156 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
157
158 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
159 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
160 dev_t dev);
161 #else
162 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
163 int dev);
164 #endif
165 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
166 struct inode *new_dir, struct dentry *new_dentry);
167 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr);
168
169 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
170 static int yaffs_sync_fs(struct super_block *sb, int wait);
171 static void yaffs_write_super(struct super_block *sb);
172 #else
173 static int yaffs_sync_fs(struct super_block *sb);
174 static int yaffs_write_super(struct super_block *sb);
175 #endif
176
177 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
178 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf);
179 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
180 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf);
181 #else
182 static int yaffs_statfs(struct super_block *sb, struct statfs *buf);
183 #endif
184 static void yaffs_read_inode(struct inode *inode);
185
186 static void yaffs_put_inode(struct inode *inode);
187 static void yaffs_delete_inode(struct inode *);
188 static void yaffs_clear_inode(struct inode *);
189
190 static int yaffs_readpage(struct file *file, struct page *page);
191 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
192 static int yaffs_writepage(struct page *page, struct writeback_control *wbc);
193 #else
194 static int yaffs_writepage(struct page *page);
195 #endif
196 static int yaffs_prepare_write(struct file *f, struct page *pg,
197 unsigned offset, unsigned to);
198 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
199 unsigned to);
200
201 static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
202 int buflen);
203 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
204 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
205 #else
206 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
207 #endif
208
209 static struct address_space_operations yaffs_file_address_operations = {
210 .readpage = yaffs_readpage,
211 .writepage = yaffs_writepage,
212 .prepare_write = yaffs_prepare_write,
213 .commit_write = yaffs_commit_write,
214 };
215
216 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,22))
217 static struct file_operations yaffs_file_operations = {
218 .read = do_sync_read,
219 .write = do_sync_write,
220 .aio_read = generic_file_aio_read,
221 .aio_write = generic_file_aio_write,
222 .mmap = generic_file_mmap,
223 .flush = yaffs_file_flush,
224 .fsync = yaffs_sync_object,
225 .splice_read = generic_file_splice_read,
226 .splice_write = generic_file_splice_write,
227 };
228
229 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18))
230
231 static struct file_operations yaffs_file_operations = {
232 .read = do_sync_read,
233 .write = do_sync_write,
234 .aio_read = generic_file_aio_read,
235 .aio_write = generic_file_aio_write,
236 .mmap = generic_file_mmap,
237 .flush = yaffs_file_flush,
238 .fsync = yaffs_sync_object,
239 .sendfile = generic_file_sendfile,
240 };
241
242 #else
243
244 static struct file_operations yaffs_file_operations = {
245 .read = generic_file_read,
246 .write = generic_file_write,
247 .mmap = generic_file_mmap,
248 .flush = yaffs_file_flush,
249 .fsync = yaffs_sync_object,
250 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
251 .sendfile = generic_file_sendfile,
252 #endif
253 };
254 #endif
255
256 static struct inode_operations yaffs_file_inode_operations = {
257 .setattr = yaffs_setattr,
258 };
259
260 static struct inode_operations yaffs_symlink_inode_operations = {
261 .readlink = yaffs_readlink,
262 .follow_link = yaffs_follow_link,
263 .setattr = yaffs_setattr,
264 };
265
266 static struct inode_operations yaffs_dir_inode_operations = {
267 .create = yaffs_create,
268 .lookup = yaffs_lookup,
269 .link = yaffs_link,
270 .unlink = yaffs_unlink,
271 .symlink = yaffs_symlink,
272 .mkdir = yaffs_mkdir,
273 .rmdir = yaffs_unlink,
274 .mknod = yaffs_mknod,
275 .rename = yaffs_rename,
276 .setattr = yaffs_setattr,
277 };
278
279 static struct file_operations yaffs_dir_operations = {
280 .read = generic_read_dir,
281 .readdir = yaffs_readdir,
282 .fsync = yaffs_sync_object,
283 };
284
285 static struct super_operations yaffs_super_ops = {
286 .statfs = yaffs_statfs,
287 .read_inode = yaffs_read_inode,
288 .put_inode = yaffs_put_inode,
289 .put_super = yaffs_put_super,
290 .delete_inode = yaffs_delete_inode,
291 .clear_inode = yaffs_clear_inode,
292 .sync_fs = yaffs_sync_fs,
293 .write_super = yaffs_write_super,
294 };
295
296 static void yaffs_GrossLock(yaffs_Device * dev)
297 {
298 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs locking\n"));
299
300 down(&dev->grossLock);
301 }
302
303 static void yaffs_GrossUnlock(yaffs_Device * dev)
304 {
305 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs unlocking\n"));
306 up(&dev->grossLock);
307
308 }
309
310 static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
311 int buflen)
312 {
313 unsigned char *alias;
314 int ret;
315
316 yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
317
318 yaffs_GrossLock(dev);
319
320 alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
321
322 yaffs_GrossUnlock(dev);
323
324 if (!alias)
325 return -ENOMEM;
326
327 ret = vfs_readlink(dentry, buffer, buflen, alias);
328 kfree(alias);
329 return ret;
330 }
331
332 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
333 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
334 #else
335 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
336 #endif
337 {
338 unsigned char *alias;
339 int ret;
340 yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
341
342 yaffs_GrossLock(dev);
343
344 alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
345
346 yaffs_GrossUnlock(dev);
347
348 if (!alias)
349 {
350 ret = -ENOMEM;
351 goto out;
352 }
353
354 ret = vfs_follow_link(nd, alias);
355 kfree(alias);
356 out:
357 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
358 return ERR_PTR (ret);
359 #else
360 return ret;
361 #endif
362 }
363
364 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
365 yaffs_Object * obj);
366
367 /*
368 * Lookup is used to find objects in the fs
369 */
370 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
371
372 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
373 struct nameidata *n)
374 #else
375 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry)
376 #endif
377 {
378 yaffs_Object *obj;
379 struct inode *inode = NULL; /* NCB 2.5/2.6 needs NULL here */
380
381 yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev;
382
383 yaffs_GrossLock(dev);
384
385 T(YAFFS_TRACE_OS,
386 (KERN_DEBUG "yaffs_lookup for %d:%s\n",
387 yaffs_InodeToObject(dir)->objectId, dentry->d_name.name));
388
389 obj =
390 yaffs_FindObjectByName(yaffs_InodeToObject(dir),
391 dentry->d_name.name);
392
393 obj = yaffs_GetEquivalentObject(obj); /* in case it was a hardlink */
394
395 /* Can't hold gross lock when calling yaffs_get_inode() */
396 yaffs_GrossUnlock(dev);
397
398 if (obj) {
399 T(YAFFS_TRACE_OS,
400 (KERN_DEBUG "yaffs_lookup found %d\n", obj->objectId));
401
402 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
403
404 if (inode) {
405 T(YAFFS_TRACE_OS,
406 (KERN_DEBUG "yaffs_loookup dentry \n"));
407 /* #if 0 asserted by NCB for 2.5/6 compatability - falls through to
408 * d_add even if NULL inode */
409 #if 0
410 /*dget(dentry); // try to solve directory bug */
411 d_add(dentry, inode);
412
413 /* return dentry; */
414 return NULL;
415 #endif
416 }
417
418 } else {
419 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_lookup not found\n"));
420
421 }
422
423 /* added NCB for 2.5/6 compatability - forces add even if inode is
424 * NULL which creates dentry hash */
425 d_add(dentry, inode);
426
427 return NULL;
428 /* return (ERR_PTR(-EIO)); */
429
430 }
431
432 /* For now put inode is just for debugging
433 * Put inode is called when the inode **structure** is put.
434 */
435 static void yaffs_put_inode(struct inode *inode)
436 {
437 T(YAFFS_TRACE_OS,
438 ("yaffs_put_inode: ino %d, count %d\n", (int)inode->i_ino,
439 atomic_read(&inode->i_count)));
440
441 }
442
443 /* clear is called to tell the fs to release any per-inode data it holds */
444 static void yaffs_clear_inode(struct inode *inode)
445 {
446 yaffs_Object *obj;
447 yaffs_Device *dev;
448
449 obj = yaffs_InodeToObject(inode);
450
451 T(YAFFS_TRACE_OS,
452 ("yaffs_clear_inode: ino %d, count %d %s\n", (int)inode->i_ino,
453 atomic_read(&inode->i_count),
454 obj ? "object exists" : "null object"));
455
456 if (obj) {
457 dev = obj->myDev;
458 yaffs_GrossLock(dev);
459
460 /* Clear the association between the inode and
461 * the yaffs_Object.
462 */
463 obj->myInode = NULL;
464 yaffs_InodeToObjectLV(inode) = NULL;
465
466 /* If the object freeing was deferred, then the real
467 * free happens now.
468 * This should fix the inode inconsistency problem.
469 */
470
471 yaffs_HandleDeferedFree(obj);
472
473 yaffs_GrossUnlock(dev);
474 }
475
476 }
477
478 /* delete is called when the link count is zero and the inode
479 * is put (ie. nobody wants to know about it anymore, time to
480 * delete the file).
481 * NB Must call clear_inode()
482 */
483 static void yaffs_delete_inode(struct inode *inode)
484 {
485 yaffs_Object *obj = yaffs_InodeToObject(inode);
486 yaffs_Device *dev;
487
488 T(YAFFS_TRACE_OS,
489 ("yaffs_delete_inode: ino %d, count %d %s\n", (int)inode->i_ino,
490 atomic_read(&inode->i_count),
491 obj ? "object exists" : "null object"));
492
493 if (obj) {
494 dev = obj->myDev;
495 yaffs_GrossLock(dev);
496 yaffs_DeleteFile(obj);
497 yaffs_GrossUnlock(dev);
498 }
499 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
500 truncate_inode_pages (&inode->i_data, 0);
501 #endif
502 clear_inode(inode);
503 }
504
505 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
506 static int yaffs_file_flush(struct file *file, fl_owner_t id)
507 #else
508 static int yaffs_file_flush(struct file *file)
509 #endif
510 {
511 yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry);
512
513 yaffs_Device *dev = obj->myDev;
514
515 T(YAFFS_TRACE_OS,
516 (KERN_DEBUG "yaffs_file_flush object %d (%s)\n", obj->objectId,
517 obj->dirty ? "dirty" : "clean"));
518
519 yaffs_GrossLock(dev);
520
521 yaffs_FlushFile(obj, 1);
522
523 yaffs_GrossUnlock(dev);
524
525 return 0;
526 }
527
528 static int yaffs_readpage_nolock(struct file *f, struct page *pg)
529 {
530 /* Lifted from jffs2 */
531
532 yaffs_Object *obj;
533 unsigned char *pg_buf;
534 int ret;
535
536 yaffs_Device *dev;
537
538 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_readpage at %08x, size %08x\n",
539 (unsigned)(pg->index << PAGE_CACHE_SHIFT),
540 (unsigned)PAGE_CACHE_SIZE));
541
542 obj = yaffs_DentryToObject(f->f_dentry);
543
544 dev = obj->myDev;
545
546 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
547 BUG_ON(!PageLocked(pg));
548 #else
549 if (!PageLocked(pg))
550 PAGE_BUG(pg);
551 #endif
552
553 pg_buf = kmap(pg);
554 /* FIXME: Can kmap fail? */
555
556 yaffs_GrossLock(dev);
557
558 ret =
559 yaffs_ReadDataFromFile(obj, pg_buf, pg->index << PAGE_CACHE_SHIFT,
560 PAGE_CACHE_SIZE);
561
562 yaffs_GrossUnlock(dev);
563
564 if (ret >= 0)
565 ret = 0;
566
567 if (ret) {
568 ClearPageUptodate(pg);
569 SetPageError(pg);
570 } else {
571 SetPageUptodate(pg);
572 ClearPageError(pg);
573 }
574
575 flush_dcache_page(pg);
576 kunmap(pg);
577
578 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_readpage done\n"));
579 return ret;
580 }
581
582 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
583 {
584 int ret = yaffs_readpage_nolock(f, pg);
585 UnlockPage(pg);
586 return ret;
587 }
588
589 static int yaffs_readpage(struct file *f, struct page *pg)
590 {
591 return yaffs_readpage_unlock(f, pg);
592 }
593
594 /* writepage inspired by/stolen from smbfs */
595
596 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
597 static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
598 #else
599 static int yaffs_writepage(struct page *page)
600 #endif
601 {
602 struct address_space *mapping = page->mapping;
603 loff_t offset = (loff_t) page->index << PAGE_CACHE_SHIFT;
604 struct inode *inode;
605 unsigned long end_index;
606 char *buffer;
607 yaffs_Object *obj;
608 int nWritten = 0;
609 unsigned nBytes;
610
611 if (!mapping)
612 BUG();
613 inode = mapping->host;
614 if (!inode)
615 BUG();
616
617 if (offset > inode->i_size) {
618 T(YAFFS_TRACE_OS,
619 (KERN_DEBUG
620 "yaffs_writepage at %08x, inode size = %08x!!!\n",
621 (unsigned)(page->index << PAGE_CACHE_SHIFT),
622 (unsigned)inode->i_size));
623 T(YAFFS_TRACE_OS,
624 (KERN_DEBUG " -> don't care!!\n"));
625 unlock_page(page);
626 return 0;
627 }
628
629 end_index = inode->i_size >> PAGE_CACHE_SHIFT;
630
631 /* easy case */
632 if (page->index < end_index) {
633 nBytes = PAGE_CACHE_SIZE;
634 } else {
635 nBytes = inode->i_size & (PAGE_CACHE_SIZE - 1);
636 }
637
638 get_page(page);
639
640 buffer = kmap(page);
641
642 obj = yaffs_InodeToObject(inode);
643 yaffs_GrossLock(obj->myDev);
644
645 T(YAFFS_TRACE_OS,
646 (KERN_DEBUG "yaffs_writepage at %08x, size %08x\n",
647 (unsigned)(page->index << PAGE_CACHE_SHIFT), nBytes));
648 T(YAFFS_TRACE_OS,
649 (KERN_DEBUG "writepag0: obj = %05x, ino = %05x\n",
650 (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
651
652 nWritten =
653 yaffs_WriteDataToFile(obj, buffer, page->index << PAGE_CACHE_SHIFT,
654 nBytes, 0);
655
656 T(YAFFS_TRACE_OS,
657 (KERN_DEBUG "writepag1: obj = %05x, ino = %05x\n",
658 (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
659
660 yaffs_GrossUnlock(obj->myDev);
661
662 kunmap(page);
663 SetPageUptodate(page);
664 UnlockPage(page);
665 put_page(page);
666
667 return (nWritten == nBytes) ? 0 : -ENOSPC;
668 }
669
670 static int yaffs_prepare_write(struct file *f, struct page *pg,
671 unsigned offset, unsigned to)
672 {
673
674 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_prepair_write\n"));
675 if (!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
676 return yaffs_readpage_nolock(f, pg);
677
678 return 0;
679
680 }
681
682 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
683 unsigned to)
684 {
685
686 void *addr = page_address(pg) + offset;
687 loff_t pos = (((loff_t) pg->index) << PAGE_CACHE_SHIFT) + offset;
688 int nBytes = to - offset;
689 int nWritten;
690
691 unsigned spos = pos;
692 unsigned saddr = (unsigned)addr;
693
694 T(YAFFS_TRACE_OS,
695 (KERN_DEBUG "yaffs_commit_write addr %x pos %x nBytes %d\n", saddr,
696 spos, nBytes));
697
698 nWritten = yaffs_file_write(f, addr, nBytes, &pos);
699
700 if (nWritten != nBytes) {
701 T(YAFFS_TRACE_OS,
702 (KERN_DEBUG
703 "yaffs_commit_write not same size nWritten %d nBytes %d\n",
704 nWritten, nBytes));
705 SetPageError(pg);
706 ClearPageUptodate(pg);
707 } else {
708 SetPageUptodate(pg);
709 }
710
711 T(YAFFS_TRACE_OS,
712 (KERN_DEBUG "yaffs_commit_write returning %d\n",
713 nWritten == nBytes ? 0 : nWritten));
714
715 return nWritten == nBytes ? 0 : nWritten;
716
717 }
718
719 static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object * obj)
720 {
721 if (inode && obj) {
722
723
724 /* Check mode against the variant type and attempt to repair if broken. */
725 __u32 mode = obj->yst_mode;
726 switch( obj->variantType ){
727 case YAFFS_OBJECT_TYPE_FILE :
728 if( ! S_ISREG(mode) ){
729 obj->yst_mode &= ~S_IFMT;
730 obj->yst_mode |= S_IFREG;
731 }
732
733 break;
734 case YAFFS_OBJECT_TYPE_SYMLINK :
735 if( ! S_ISLNK(mode) ){
736 obj->yst_mode &= ~S_IFMT;
737 obj->yst_mode |= S_IFLNK;
738 }
739
740 break;
741 case YAFFS_OBJECT_TYPE_DIRECTORY :
742 if( ! S_ISDIR(mode) ){
743 obj->yst_mode &= ~S_IFMT;
744 obj->yst_mode |= S_IFDIR;
745 }
746
747 break;
748 case YAFFS_OBJECT_TYPE_UNKNOWN :
749 case YAFFS_OBJECT_TYPE_HARDLINK :
750 case YAFFS_OBJECT_TYPE_SPECIAL :
751 default:
752 /* TODO? */
753 break;
754 }
755
756 inode->i_ino = obj->objectId;
757 inode->i_mode = obj->yst_mode;
758 inode->i_uid = obj->yst_uid;
759 inode->i_gid = obj->yst_gid;
760 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19))
761 inode->i_blksize = inode->i_sb->s_blocksize;
762 #endif
763 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
764
765 inode->i_rdev = old_decode_dev(obj->yst_rdev);
766 inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
767 inode->i_atime.tv_nsec = 0;
768 inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
769 inode->i_mtime.tv_nsec = 0;
770 inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
771 inode->i_ctime.tv_nsec = 0;
772 #else
773 inode->i_rdev = obj->yst_rdev;
774 inode->i_atime = obj->yst_atime;
775 inode->i_mtime = obj->yst_mtime;
776 inode->i_ctime = obj->yst_ctime;
777 #endif
778 inode->i_size = yaffs_GetObjectFileLength(obj);
779 inode->i_blocks = (inode->i_size + 511) >> 9;
780
781 inode->i_nlink = yaffs_GetObjectLinkCount(obj);
782
783 T(YAFFS_TRACE_OS,
784 (KERN_DEBUG
785 "yaffs_FillInode mode %x uid %d gid %d size %d count %d\n",
786 inode->i_mode, inode->i_uid, inode->i_gid,
787 (int)inode->i_size, atomic_read(&inode->i_count)));
788
789 switch (obj->yst_mode & S_IFMT) {
790 default: /* fifo, device or socket */
791 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
792 init_special_inode(inode, obj->yst_mode,
793 old_decode_dev(obj->yst_rdev));
794 #else
795 init_special_inode(inode, obj->yst_mode,
796 (dev_t) (obj->yst_rdev));
797 #endif
798 break;
799 case S_IFREG: /* file */
800 inode->i_op = &yaffs_file_inode_operations;
801 inode->i_fop = &yaffs_file_operations;
802 inode->i_mapping->a_ops =
803 &yaffs_file_address_operations;
804 break;
805 case S_IFDIR: /* directory */
806 inode->i_op = &yaffs_dir_inode_operations;
807 inode->i_fop = &yaffs_dir_operations;
808 break;
809 case S_IFLNK: /* symlink */
810 inode->i_op = &yaffs_symlink_inode_operations;
811 break;
812 }
813
814 yaffs_InodeToObjectLV(inode) = obj;
815
816 obj->myInode = inode;
817
818 } else {
819 T(YAFFS_TRACE_OS,
820 (KERN_DEBUG "yaffs_FileInode invalid parameters\n"));
821 }
822
823 }
824
825 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
826 yaffs_Object * obj)
827 {
828 struct inode *inode;
829
830 if (!sb) {
831 T(YAFFS_TRACE_OS,
832 (KERN_DEBUG "yaffs_get_inode for NULL super_block!!\n"));
833 return NULL;
834
835 }
836
837 if (!obj) {
838 T(YAFFS_TRACE_OS,
839 (KERN_DEBUG "yaffs_get_inode for NULL object!!\n"));
840 return NULL;
841
842 }
843
844 T(YAFFS_TRACE_OS,
845 (KERN_DEBUG "yaffs_get_inode for object %d\n", obj->objectId));
846
847 inode = iget(sb, obj->objectId);
848
849 /* NB Side effect: iget calls back to yaffs_read_inode(). */
850 /* iget also increments the inode's i_count */
851 /* NB You can't be holding grossLock or deadlock will happen! */
852
853 return inode;
854 }
855
856 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
857 loff_t * pos)
858 {
859 yaffs_Object *obj;
860 int nWritten, ipos;
861 struct inode *inode;
862 yaffs_Device *dev;
863
864 obj = yaffs_DentryToObject(f->f_dentry);
865
866 dev = obj->myDev;
867
868 yaffs_GrossLock(dev);
869
870 inode = f->f_dentry->d_inode;
871
872 if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND) {
873 ipos = inode->i_size;
874 } else {
875 ipos = *pos;
876 }
877
878 if (!obj) {
879 T(YAFFS_TRACE_OS,
880 (KERN_DEBUG "yaffs_file_write: hey obj is null!\n"));
881 } else {
882 T(YAFFS_TRACE_OS,
883 (KERN_DEBUG
884 "yaffs_file_write about to write writing %d bytes"
885 "to object %d at %d\n",
886 n, obj->objectId, ipos));
887 }
888
889 nWritten = yaffs_WriteDataToFile(obj, buf, ipos, n, 0);
890
891 T(YAFFS_TRACE_OS,
892 (KERN_DEBUG "yaffs_file_write writing %d bytes, %d written at %d\n",
893 n, nWritten, ipos));
894 if (nWritten > 0) {
895 ipos += nWritten;
896 *pos = ipos;
897 if (ipos > inode->i_size) {
898 inode->i_size = ipos;
899 inode->i_blocks = (ipos + 511) >> 9;
900
901 T(YAFFS_TRACE_OS,
902 (KERN_DEBUG
903 "yaffs_file_write size updated to %d bytes, "
904 "%d blocks\n",
905 ipos, (int)(inode->i_blocks)));
906 }
907
908 }
909 yaffs_GrossUnlock(dev);
910 return nWritten == 0 ? -ENOSPC : nWritten;
911 }
912
913 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
914 {
915 yaffs_Object *obj;
916 yaffs_Device *dev;
917 struct inode *inode = f->f_dentry->d_inode;
918 unsigned long offset, curoffs;
919 struct list_head *i;
920 yaffs_Object *l;
921
922 char name[YAFFS_MAX_NAME_LENGTH + 1];
923
924 obj = yaffs_DentryToObject(f->f_dentry);
925 dev = obj->myDev;
926
927 yaffs_GrossLock(dev);
928
929 offset = f->f_pos;
930
931 T(YAFFS_TRACE_OS, ("yaffs_readdir: starting at %d\n", (int)offset));
932
933 if (offset == 0) {
934 T(YAFFS_TRACE_OS,
935 (KERN_DEBUG "yaffs_readdir: entry . ino %d \n",
936 (int)inode->i_ino));
937 if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR)
938 < 0) {
939 goto out;
940 }
941 offset++;
942 f->f_pos++;
943 }
944 if (offset == 1) {
945 T(YAFFS_TRACE_OS,
946 (KERN_DEBUG "yaffs_readdir: entry .. ino %d \n",
947 (int)f->f_dentry->d_parent->d_inode->i_ino));
948 if (filldir
949 (dirent, "..", 2, offset,
950 f->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
951 goto out;
952 }
953 offset++;
954 f->f_pos++;
955 }
956
957 curoffs = 1;
958
959 /* If the directory has changed since the open or last call to
960 readdir, rewind to after the 2 canned entries. */
961
962 if (f->f_version != inode->i_version) {
963 offset = 2;
964 f->f_pos = offset;
965 f->f_version = inode->i_version;
966 }
967
968 list_for_each(i, &obj->variant.directoryVariant.children) {
969 curoffs++;
970 if (curoffs >= offset) {
971 l = list_entry(i, yaffs_Object, siblings);
972
973 yaffs_GetObjectName(l, name,
974 YAFFS_MAX_NAME_LENGTH + 1);
975 T(YAFFS_TRACE_OS,
976 (KERN_DEBUG "yaffs_readdir: %s inode %d\n", name,
977 yaffs_GetObjectInode(l)));
978
979 if (filldir(dirent,
980 name,
981 strlen(name),
982 offset,
983 yaffs_GetObjectInode(l),
984 yaffs_GetObjectType(l))
985 < 0) {
986 goto up_and_out;
987 }
988
989 offset++;
990 f->f_pos++;
991 }
992 }
993
994 up_and_out:
995 out:
996
997 yaffs_GrossUnlock(dev);
998
999 return 0;
1000 }
1001
1002 /*
1003 * File creation. Allocate an inode, and we're done..
1004 */
1005 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1006 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1007 dev_t rdev)
1008 #else
1009 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1010 int rdev)
1011 #endif
1012 {
1013 struct inode *inode;
1014
1015 yaffs_Object *obj = NULL;
1016 yaffs_Device *dev;
1017
1018 yaffs_Object *parent = yaffs_InodeToObject(dir);
1019
1020 int error = -ENOSPC;
1021 uid_t uid = current->fsuid;
1022 gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
1023
1024 if((dir->i_mode & S_ISGID) && S_ISDIR(mode))
1025 mode |= S_ISGID;
1026
1027 if (parent) {
1028 T(YAFFS_TRACE_OS,
1029 (KERN_DEBUG "yaffs_mknod: parent object %d type %d\n",
1030 parent->objectId, parent->variantType));
1031 } else {
1032 T(YAFFS_TRACE_OS,
1033 (KERN_DEBUG "yaffs_mknod: could not get parent object\n"));
1034 return -EPERM;
1035 }
1036
1037 T(YAFFS_TRACE_OS, ("yaffs_mknod: making oject for %s, "
1038 "mode %x dev %x\n",
1039 dentry->d_name.name, mode, rdev));
1040
1041 dev = parent->myDev;
1042
1043 yaffs_GrossLock(dev);
1044
1045 switch (mode & S_IFMT) {
1046 default:
1047 /* Special (socket, fifo, device...) */
1048 T(YAFFS_TRACE_OS, (KERN_DEBUG
1049 "yaffs_mknod: making special\n"));
1050 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1051 obj =
1052 yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
1053 gid, old_encode_dev(rdev));
1054 #else
1055 obj =
1056 yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
1057 gid, rdev);
1058 #endif
1059 break;
1060 case S_IFREG: /* file */
1061 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_mknod: making file\n"));
1062 obj =
1063 yaffs_MknodFile(parent, dentry->d_name.name, mode, uid,
1064 gid);
1065 break;
1066 case S_IFDIR: /* directory */
1067 T(YAFFS_TRACE_OS,
1068 (KERN_DEBUG "yaffs_mknod: making directory\n"));
1069 obj =
1070 yaffs_MknodDirectory(parent, dentry->d_name.name, mode,
1071 uid, gid);
1072 break;
1073 case S_IFLNK: /* symlink */
1074 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_mknod: making file\n"));
1075 obj = NULL; /* Do we ever get here? */
1076 break;
1077 }
1078
1079 /* Can not call yaffs_get_inode() with gross lock held */
1080 yaffs_GrossUnlock(dev);
1081
1082 if (obj) {
1083 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
1084 d_instantiate(dentry, inode);
1085 T(YAFFS_TRACE_OS,
1086 (KERN_DEBUG "yaffs_mknod created object %d count = %d\n",
1087 obj->objectId, atomic_read(&inode->i_count)));
1088 error = 0;
1089 } else {
1090 T(YAFFS_TRACE_OS,
1091 (KERN_DEBUG "yaffs_mknod failed making object\n"));
1092 error = -ENOMEM;
1093 }
1094
1095 return error;
1096 }
1097
1098 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1099 {
1100 int retVal;
1101 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_mkdir\n"));
1102 retVal = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
1103 #if 0
1104 /* attempt to fix dir bug - didn't work */
1105 if (!retVal) {
1106 dget(dentry);
1107 }
1108 #endif
1109 return retVal;
1110 }
1111
1112 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1113 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
1114 struct nameidata *n)
1115 #else
1116 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
1117 #endif
1118 {
1119 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_create\n"));
1120 return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
1121 }
1122
1123 static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
1124 {
1125 int retVal;
1126
1127 yaffs_Device *dev;
1128
1129 T(YAFFS_TRACE_OS,
1130 (KERN_DEBUG "yaffs_unlink %d:%s\n", (int)(dir->i_ino),
1131 dentry->d_name.name));
1132
1133 dev = yaffs_InodeToObject(dir)->myDev;
1134
1135 yaffs_GrossLock(dev);
1136
1137 retVal = yaffs_Unlink(yaffs_InodeToObject(dir), dentry->d_name.name);
1138
1139 if (retVal == YAFFS_OK) {
1140 dentry->d_inode->i_nlink--;
1141 dir->i_version++;
1142 yaffs_GrossUnlock(dev);
1143 mark_inode_dirty(dentry->d_inode);
1144 return 0;
1145 }
1146 yaffs_GrossUnlock(dev);
1147 return -ENOTEMPTY;
1148 }
1149
1150 /*
1151 * Create a link...
1152 */
1153 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
1154 struct dentry *dentry)
1155 {
1156 struct inode *inode = old_dentry->d_inode;
1157 yaffs_Object *obj = NULL;
1158 yaffs_Object *link = NULL;
1159 yaffs_Device *dev;
1160
1161 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_link\n"));
1162
1163 obj = yaffs_InodeToObject(inode);
1164 dev = obj->myDev;
1165
1166 yaffs_GrossLock(dev);
1167
1168 if (!S_ISDIR(inode->i_mode)) /* Don't link directories */
1169 {
1170 link =
1171 yaffs_Link(yaffs_InodeToObject(dir), dentry->d_name.name,
1172 obj);
1173 }
1174
1175 if (link) {
1176 old_dentry->d_inode->i_nlink = yaffs_GetObjectLinkCount(obj);
1177 d_instantiate(dentry, old_dentry->d_inode);
1178 atomic_inc(&old_dentry->d_inode->i_count);
1179 T(YAFFS_TRACE_OS,
1180 (KERN_DEBUG "yaffs_link link count %d i_count %d\n",
1181 old_dentry->d_inode->i_nlink,
1182 atomic_read(&old_dentry->d_inode->i_count)));
1183
1184 }
1185
1186 yaffs_GrossUnlock(dev);
1187
1188 if (link) {
1189
1190 return 0;
1191 }
1192
1193 return -EPERM;
1194 }
1195
1196 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
1197 const char *symname)
1198 {
1199 yaffs_Object *obj;
1200 yaffs_Device *dev;
1201 uid_t uid = current->fsuid;
1202 gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
1203
1204 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_symlink\n"));
1205
1206 dev = yaffs_InodeToObject(dir)->myDev;
1207 yaffs_GrossLock(dev);
1208 obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name,
1209 S_IFLNK | S_IRWXUGO, uid, gid, symname);
1210 yaffs_GrossUnlock(dev);
1211
1212 if (obj) {
1213
1214 struct inode *inode;
1215
1216 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
1217 d_instantiate(dentry, inode);
1218 T(YAFFS_TRACE_OS, (KERN_DEBUG "symlink created OK\n"));
1219 return 0;
1220 } else {
1221 T(YAFFS_TRACE_OS, (KERN_DEBUG "symlink not created\n"));
1222
1223 }
1224
1225 return -ENOMEM;
1226 }
1227
1228 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
1229 int datasync)
1230 {
1231
1232 yaffs_Object *obj;
1233 yaffs_Device *dev;
1234
1235 obj = yaffs_DentryToObject(dentry);
1236
1237 dev = obj->myDev;
1238
1239 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_sync_object\n"));
1240 yaffs_GrossLock(dev);
1241 yaffs_FlushFile(obj, 1);
1242 yaffs_GrossUnlock(dev);
1243 return 0;
1244 }
1245
1246 /*
1247 * The VFS layer already does all the dentry stuff for rename.
1248 *
1249 * NB: POSIX says you can rename an object over an old object of the same name
1250 */
1251 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
1252 struct inode *new_dir, struct dentry *new_dentry)
1253 {
1254 yaffs_Device *dev;
1255 int retVal = YAFFS_FAIL;
1256 yaffs_Object *target;
1257
1258 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_rename\n"));
1259 dev = yaffs_InodeToObject(old_dir)->myDev;
1260
1261 yaffs_GrossLock(dev);
1262
1263 /* Check if the target is an existing directory that is not empty. */
1264 target =
1265 yaffs_FindObjectByName(yaffs_InodeToObject(new_dir),
1266 new_dentry->d_name.name);
1267
1268
1269
1270 if (target &&
1271 target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
1272 !list_empty(&target->variant.directoryVariant.children)) {
1273
1274 T(YAFFS_TRACE_OS, (KERN_DEBUG "target is non-empty dir\n"));
1275
1276 retVal = YAFFS_FAIL;
1277 } else {
1278
1279 /* Now does unlinking internally using shadowing mechanism */
1280 T(YAFFS_TRACE_OS, (KERN_DEBUG "calling yaffs_RenameObject\n"));
1281
1282 retVal =
1283 yaffs_RenameObject(yaffs_InodeToObject(old_dir),
1284 old_dentry->d_name.name,
1285 yaffs_InodeToObject(new_dir),
1286 new_dentry->d_name.name);
1287
1288 }
1289 yaffs_GrossUnlock(dev);
1290
1291 if (retVal == YAFFS_OK) {
1292 if(target) {
1293 new_dentry->d_inode->i_nlink--;
1294 mark_inode_dirty(new_dentry->d_inode);
1295 }
1296
1297 return 0;
1298 } else {
1299 return -ENOTEMPTY;
1300 }
1301
1302 }
1303
1304 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
1305 {
1306 struct inode *inode = dentry->d_inode;
1307 int error;
1308 yaffs_Device *dev;
1309
1310 T(YAFFS_TRACE_OS,
1311 (KERN_DEBUG "yaffs_setattr of object %d\n",
1312 yaffs_InodeToObject(inode)->objectId));
1313
1314 if ((error = inode_change_ok(inode, attr)) == 0) {
1315
1316 dev = yaffs_InodeToObject(inode)->myDev;
1317 yaffs_GrossLock(dev);
1318 if (yaffs_SetAttributes(yaffs_InodeToObject(inode), attr) ==
1319 YAFFS_OK) {
1320 error = 0;
1321 } else {
1322 error = -EPERM;
1323 }
1324 yaffs_GrossUnlock(dev);
1325 if (!error)
1326 error = inode_setattr(inode, attr);
1327 }
1328 return error;
1329 }
1330
1331 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1332 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
1333 {
1334 yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
1335 struct super_block *sb = dentry->d_sb;
1336 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1337 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
1338 {
1339 yaffs_Device *dev = yaffs_SuperToDevice(sb);
1340 #else
1341 static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
1342 {
1343 yaffs_Device *dev = yaffs_SuperToDevice(sb);
1344 #endif
1345
1346 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_statfs\n"));
1347
1348 yaffs_GrossLock(dev);
1349
1350 buf->f_type = YAFFS_MAGIC;
1351 buf->f_bsize = sb->s_blocksize;
1352 buf->f_namelen = 255;
1353 if (sb->s_blocksize > dev->nDataBytesPerChunk) {
1354
1355 buf->f_blocks =
1356 (dev->endBlock - dev->startBlock +
1357 1) * dev->nChunksPerBlock / (sb->s_blocksize /
1358 dev->nDataBytesPerChunk);
1359 buf->f_bfree =
1360 yaffs_GetNumberOfFreeChunks(dev) / (sb->s_blocksize /
1361 dev->nDataBytesPerChunk);
1362 } else {
1363
1364 buf->f_blocks =
1365 (dev->endBlock - dev->startBlock +
1366 1) * dev->nChunksPerBlock * (dev->nDataBytesPerChunk /
1367 sb->s_blocksize);
1368 buf->f_bfree =
1369 yaffs_GetNumberOfFreeChunks(dev) * (dev->nDataBytesPerChunk /
1370 sb->s_blocksize);
1371 }
1372 buf->f_files = 0;
1373 buf->f_ffree = 0;
1374 buf->f_bavail = buf->f_bfree;
1375
1376 yaffs_GrossUnlock(dev);
1377 return 0;
1378 }
1379
1380
1381 /**
1382 static int yaffs_do_sync_fs(struct super_block *sb)
1383 {
1384
1385 yaffs_Device *dev = yaffs_SuperToDevice(sb);
1386 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_do_sync_fs\n"));
1387
1388 if(sb->s_dirt) {
1389 yaffs_GrossLock(dev);
1390
1391 if(dev)
1392 yaffs_CheckpointSave(dev);
1393
1394 yaffs_GrossUnlock(dev);
1395
1396 sb->s_dirt = 0;
1397 }
1398 return 0;
1399 }
1400 **/
1401
1402 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1403 static void yaffs_write_super(struct super_block *sb)
1404 #else
1405 static int yaffs_write_super(struct super_block *sb)
1406 #endif
1407 {
1408
1409 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_write_super\n"));
1410 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18))
1411 return 0; /* yaffs_do_sync_fs(sb);*/
1412 #endif
1413 }
1414
1415
1416 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1417 static int yaffs_sync_fs(struct super_block *sb, int wait)
1418 #else
1419 static int yaffs_sync_fs(struct super_block *sb)
1420 #endif
1421 {
1422
1423 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_sync_fs\n"));
1424
1425 return 0; /* yaffs_do_sync_fs(sb);*/
1426
1427 }
1428
1429
1430 static void yaffs_read_inode(struct inode *inode)
1431 {
1432 /* NB This is called as a side effect of other functions, but
1433 * we had to release the lock to prevent deadlocks, so
1434 * need to lock again.
1435 */
1436
1437 yaffs_Object *obj;
1438 yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
1439
1440 T(YAFFS_TRACE_OS,
1441 (KERN_DEBUG "yaffs_read_inode for %d\n", (int)inode->i_ino));
1442
1443 yaffs_GrossLock(dev);
1444
1445 obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
1446
1447 yaffs_FillInodeFromObject(inode, obj);
1448
1449 yaffs_GrossUnlock(dev);
1450 }
1451
1452 static LIST_HEAD(yaffs_dev_list);
1453
1454 #if 0 // not used
1455 static int yaffs_remount_fs(struct super_block *sb, int *flags, char *data)
1456 {
1457 yaffs_Device *dev = yaffs_SuperToDevice(sb);
1458
1459 if( *flags & MS_RDONLY ) {
1460 struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1461
1462 T(YAFFS_TRACE_OS,
1463 (KERN_DEBUG "yaffs_remount_fs: %s: RO\n", dev->name ));
1464
1465 yaffs_GrossLock(dev);
1466
1467 yaffs_FlushEntireDeviceCache(dev);
1468
1469 yaffs_CheckpointSave(dev);
1470
1471 if (mtd->sync)
1472 mtd->sync(mtd);
1473
1474 yaffs_GrossUnlock(dev);
1475 }
1476 else {
1477 T(YAFFS_TRACE_OS,
1478 (KERN_DEBUG "yaffs_remount_fs: %s: RW\n", dev->name ));
1479 }
1480
1481 return 0;
1482 }
1483 #endif
1484
1485 static void yaffs_put_super(struct super_block *sb)
1486 {
1487 yaffs_Device *dev = yaffs_SuperToDevice(sb);
1488
1489 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_put_super\n"));
1490
1491 yaffs_GrossLock(dev);
1492
1493 yaffs_FlushEntireDeviceCache(dev);
1494
1495 yaffs_CheckpointSave(dev);
1496
1497 if (dev->putSuperFunc) {
1498 dev->putSuperFunc(sb);
1499 }
1500
1501 yaffs_Deinitialise(dev);
1502
1503 yaffs_GrossUnlock(dev);
1504
1505 /* we assume this is protected by lock_kernel() in mount/umount */
1506 list_del(&dev->devList);
1507
1508 if(dev->spareBuffer){
1509 YFREE(dev->spareBuffer);
1510 dev->spareBuffer = NULL;
1511 }
1512
1513 kfree(dev);
1514 }
1515
1516
1517 static void yaffs_MTDPutSuper(struct super_block *sb)
1518 {
1519
1520 struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1521
1522 if (mtd->sync) {
1523 mtd->sync(mtd);
1524 }
1525
1526 put_mtd_device(mtd);
1527 }
1528
1529
1530 static void yaffs_MarkSuperBlockDirty(void *vsb)
1531 {
1532 struct super_block *sb = (struct super_block *)vsb;
1533
1534 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_MarkSuperBlockDirty() sb = %p\n",sb));
1535 // if(sb)
1536 // sb->s_dirt = 1;
1537 }
1538
1539 typedef struct {
1540 int inband_tags;
1541 int skip_checkpoint_read;
1542 int skip_checkpoint_write;
1543 int no_cache;
1544 } yaffs_options;
1545
1546 #define MAX_OPT_LEN 20
1547 static int yaffs_parse_options(yaffs_options *options, const char *options_str)
1548 {
1549 char cur_opt[MAX_OPT_LEN+1];
1550 int p;
1551 int error = 0;
1552
1553 /* Parse through the options which is a comma seperated list */
1554
1555 while(options_str && *options_str && !error){
1556 memset(cur_opt,0,MAX_OPT_LEN+1);
1557 p = 0;
1558
1559 while(*options_str && *options_str != ','){
1560 if(p < MAX_OPT_LEN){
1561 cur_opt[p] = *options_str;
1562 p++;
1563 }
1564 options_str++;
1565 }
1566
1567 if(!strcmp(cur_opt,"inband-tags"))
1568 options->inband_tags = 1;
1569 else if(!strcmp(cur_opt,"no-cache"))
1570 options->no_cache = 1;
1571 else if(!strcmp(cur_opt,"no-checkpoint-read"))
1572 options->skip_checkpoint_read = 1;
1573 else if(!strcmp(cur_opt,"no-checkpoint-write"))
1574 options->skip_checkpoint_write = 1;
1575 else if(!strcmp(cur_opt,"no-checkpoint")){
1576 options->skip_checkpoint_read = 1;
1577 options->skip_checkpoint_write = 1;
1578 } else {
1579 printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n",cur_opt);
1580 error = 1;
1581 }
1582
1583 }
1584
1585 return error;
1586 }
1587
1588 static struct super_block *yaffs_internal_read_super(int yaffsVersion,
1589 struct super_block *sb,
1590 void *data, int silent)
1591 {
1592 int nBlocks;
1593 struct inode *inode = NULL;
1594 struct dentry *root;
1595 yaffs_Device *dev = 0;
1596 char devname_buf[BDEVNAME_SIZE + 1];
1597 struct mtd_info *mtd;
1598 int err;
1599 char *data_str = (char *)data;
1600
1601 yaffs_options options;
1602
1603 sb->s_magic = YAFFS_MAGIC;
1604 sb->s_op = &yaffs_super_ops;
1605
1606 if (!sb)
1607 printk(KERN_INFO "yaffs: sb is NULL\n");
1608 else if (!sb->s_dev)
1609 printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
1610 else if (!yaffs_devname(sb, devname_buf))
1611 printk(KERN_INFO "yaffs: devname is NULL\n");
1612 else
1613 printk(KERN_INFO "yaffs: dev is %d name is \"%s\"\n",
1614 sb->s_dev,
1615 yaffs_devname(sb, devname_buf));
1616
1617 if(!data_str)
1618 data_str = "";
1619
1620 printk(KERN_INFO "yaffs: passed flags \"%s\"\n",data_str);
1621
1622 memset(&options,0,sizeof(options));
1623
1624 if(yaffs_parse_options(&options,data_str)){
1625 /* Option parsing failed */
1626 return NULL;
1627 }
1628
1629
1630 sb->s_blocksize = PAGE_CACHE_SIZE;
1631 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1632 T(YAFFS_TRACE_OS, ("yaffs_read_super: Using yaffs%d\n", yaffsVersion));
1633 T(YAFFS_TRACE_OS,
1634 ("yaffs_read_super: block size %d\n", (int)(sb->s_blocksize)));
1635
1636 #ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
1637 T(YAFFS_TRACE_OS,
1638 ("yaffs: Write verification disabled. All guarantees "
1639 "null and void\n"));
1640 #endif
1641
1642 T(YAFFS_TRACE_ALWAYS, ("yaffs: Attempting MTD mount on %u.%u, "
1643 "\"%s\"\n",
1644 MAJOR(sb->s_dev), MINOR(sb->s_dev),
1645 yaffs_devname(sb, devname_buf)));
1646
1647 /* Check it's an mtd device..... */
1648 if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR) {
1649 return NULL; /* This isn't an mtd device */
1650 }
1651 /* Get the device */
1652 mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
1653 if (!mtd) {
1654 T(YAFFS_TRACE_ALWAYS,
1655 ("yaffs: MTD device #%u doesn't appear to exist\n",
1656 MINOR(sb->s_dev)));
1657 return NULL;
1658 }
1659 /* Check it's NAND */
1660 if (mtd->type != MTD_NANDFLASH) {
1661 T(YAFFS_TRACE_ALWAYS,
1662 ("yaffs: MTD device is not NAND it's type %d\n", mtd->type));
1663 return NULL;
1664 }
1665
1666 T(YAFFS_TRACE_OS, (" erase %p\n", mtd->erase));
1667 T(YAFFS_TRACE_OS, (" read %p\n", mtd->read));
1668 T(YAFFS_TRACE_OS, (" write %p\n", mtd->write));
1669 T(YAFFS_TRACE_OS, (" readoob %p\n", mtd->read_oob));
1670 T(YAFFS_TRACE_OS, (" writeoob %p\n", mtd->write_oob));
1671 T(YAFFS_TRACE_OS, (" block_isbad %p\n", mtd->block_isbad));
1672 T(YAFFS_TRACE_OS, (" block_markbad %p\n", mtd->block_markbad));
1673 T(YAFFS_TRACE_OS, (" %s %d\n", WRITE_SIZE_STR, WRITE_SIZE(mtd)));
1674 T(YAFFS_TRACE_OS, (" oobsize %d\n", mtd->oobsize));
1675 T(YAFFS_TRACE_OS, (" erasesize %d\n", mtd->erasesize));
1676 T(YAFFS_TRACE_OS, (" size %d\n", mtd->size));
1677
1678 #ifdef CONFIG_YAFFS_AUTO_YAFFS2
1679
1680 if (yaffsVersion == 1 &&
1681 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1682 mtd->writesize >= 2048) {
1683 #else
1684 mtd->oobblock >= 2048) {
1685 #endif
1686 T(YAFFS_TRACE_ALWAYS,("yaffs: auto selecting yaffs2\n"));
1687 yaffsVersion = 2;
1688 }
1689
1690 /* Added NCB 26/5/2006 for completeness */
1691 if (yaffsVersion == 2 &&
1692 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1693 mtd->writesize == 512) {
1694 #else
1695 mtd->oobblock == 512) {
1696 #endif
1697 T(YAFFS_TRACE_ALWAYS,("yaffs: auto selecting yaffs1\n"));
1698 yaffsVersion = 1;
1699 }
1700
1701 #endif
1702
1703 if (yaffsVersion == 2) {
1704 /* Check for version 2 style functions */
1705 if (!mtd->erase ||
1706 !mtd->block_isbad ||
1707 !mtd->block_markbad ||
1708 !mtd->read ||
1709 !mtd->write ||
1710 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1711 !mtd->read_oob || !mtd->write_oob) {
1712 #else
1713 !mtd->write_ecc ||
1714 !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
1715 #endif
1716 T(YAFFS_TRACE_ALWAYS,
1717 ("yaffs: MTD device does not support required "
1718 "functions\n"));;
1719 return NULL;
1720 }
1721
1722 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1723 if (mtd->writesize < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
1724 #else
1725 if (mtd->oobblock < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
1726 #endif
1727 mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) {
1728 T(YAFFS_TRACE_ALWAYS,
1729 ("yaffs: MTD device does not have the "
1730 "right page sizes\n"));
1731 return NULL;
1732 }
1733 } else {
1734 /* Check for V1 style functions */
1735 if (!mtd->erase ||
1736 !mtd->read ||
1737 !mtd->write ||
1738 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1739 !mtd->read_oob || !mtd->write_oob) {
1740 #else
1741 !mtd->write_ecc ||
1742 !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
1743 #endif
1744 T(YAFFS_TRACE_ALWAYS,
1745 ("yaffs: MTD device does not support required "
1746 "functions\n"));;
1747 return NULL;
1748 }
1749
1750 if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK ||
1751 mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
1752 T(YAFFS_TRACE_ALWAYS,
1753 ("yaffs: MTD device does not support have the "
1754 "right page sizes\n"));
1755 return NULL;
1756 }
1757 }
1758
1759 /* OK, so if we got here, we have an MTD that's NAND and looks
1760 * like it has the right capabilities
1761 * Set the yaffs_Device up for mtd
1762 */
1763
1764 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1765 sb->s_fs_info = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
1766 #else
1767 sb->u.generic_sbp = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
1768 #endif
1769 if (!dev) {
1770 /* Deep shit could not allocate device structure */
1771 T(YAFFS_TRACE_ALWAYS,
1772 ("yaffs_read_super: Failed trying to allocate "
1773 "yaffs_Device. \n"));
1774 return NULL;
1775 }
1776
1777 memset(dev, 0, sizeof(yaffs_Device));
1778 dev->genericDevice = mtd;
1779 dev->name = mtd->name;
1780
1781 /* Set up the memory size parameters.... */
1782
1783 nBlocks = mtd->size / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
1784 dev->startBlock = 0;
1785 dev->endBlock = nBlocks - 1;
1786 dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
1787 dev->nDataBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
1788 dev->nReservedBlocks = 5;
1789 dev->nShortOpCaches = (options.no_cache) ? 0 : 10;
1790
1791 /* ... and the functions. */
1792 if (yaffsVersion == 2) {
1793 dev->writeChunkWithTagsToNAND =
1794 nandmtd2_WriteChunkWithTagsToNAND;
1795 dev->readChunkWithTagsFromNAND =
1796 nandmtd2_ReadChunkWithTagsFromNAND;
1797 dev->markNANDBlockBad = nandmtd2_MarkNANDBlockBad;
1798 dev->queryNANDBlock = nandmtd2_QueryNANDBlock;
1799 dev->spareBuffer = YMALLOC(mtd->oobsize);
1800 dev->isYaffs2 = 1;
1801 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1802 dev->nDataBytesPerChunk = mtd->writesize;
1803 dev->nChunksPerBlock = mtd->erasesize / mtd->writesize;
1804 #else
1805 dev->nDataBytesPerChunk = mtd->oobblock;
1806 dev->nChunksPerBlock = mtd->erasesize / mtd->oobblock;
1807 #endif
1808 nBlocks = mtd->size / mtd->erasesize;
1809
1810 dev->nCheckpointReservedBlocks = CONFIG_YAFFS_CHECKPOINT_RESERVED_BLOCKS;
1811 dev->startBlock = 0;
1812 dev->endBlock = nBlocks - 1;
1813 } else {
1814 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1815 /* use the MTD interface in yaffs_mtdif1.c */
1816 dev->writeChunkWithTagsToNAND =
1817 nandmtd1_WriteChunkWithTagsToNAND;
1818 dev->readChunkWithTagsFromNAND =
1819 nandmtd1_ReadChunkWithTagsFromNAND;
1820 dev->markNANDBlockBad = nandmtd1_MarkNANDBlockBad;
1821 dev->queryNANDBlock = nandmtd1_QueryNANDBlock;
1822 #else
1823 dev->writeChunkToNAND = nandmtd_WriteChunkToNAND;
1824 dev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
1825 #endif
1826 dev->isYaffs2 = 0;
1827 }
1828 /* ... and common functions */
1829 dev->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
1830 dev->initialiseNAND = nandmtd_InitialiseNAND;
1831
1832 dev->putSuperFunc = yaffs_MTDPutSuper;
1833
1834 dev->superBlock = (void *)sb;
1835 dev->markSuperBlockDirty = yaffs_MarkSuperBlockDirty;
1836
1837
1838 #ifndef CONFIG_YAFFS_DOES_ECC
1839 dev->useNANDECC = 1;
1840 #endif
1841
1842 #ifdef CONFIG_YAFFS_DISABLE_WIDE_TNODES
1843 dev->wideTnodesDisabled = 1;
1844 #endif
1845
1846 dev->skipCheckpointRead = options.skip_checkpoint_read;
1847 dev->skipCheckpointWrite = options.skip_checkpoint_write;
1848
1849 /* we assume this is protected by lock_kernel() in mount/umount */
1850 list_add_tail(&dev->devList, &yaffs_dev_list);
1851
1852 init_MUTEX(&dev->grossLock);
1853
1854 yaffs_GrossLock(dev);
1855
1856 err = yaffs_GutsInitialise(dev);
1857
1858 T(YAFFS_TRACE_OS,
1859 ("yaffs_read_super: guts initialised %s\n",
1860 (err == YAFFS_OK) ? "OK" : "FAILED"));
1861
1862 /* Release lock before yaffs_get_inode() */
1863 yaffs_GrossUnlock(dev);
1864
1865 /* Create root inode */
1866 if (err == YAFFS_OK)
1867 inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,
1868 yaffs_Root(dev));
1869
1870 if (!inode)
1871 return NULL;
1872
1873 inode->i_op = &yaffs_dir_inode_operations;
1874 inode->i_fop = &yaffs_dir_operations;
1875
1876 T(YAFFS_TRACE_OS, ("yaffs_read_super: got root inode\n"));
1877
1878 root = d_alloc_root(inode);
1879
1880 T(YAFFS_TRACE_OS, ("yaffs_read_super: d_alloc_root done\n"));
1881
1882 if (!root) {
1883 iput(inode);
1884 return NULL;
1885 }
1886 sb->s_root = root;
1887
1888 T(YAFFS_TRACE_OS, ("yaffs_read_super: done\n"));
1889 return sb;
1890 }
1891
1892
1893 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1894 static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
1895 int silent)
1896 {
1897 return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
1898 }
1899
1900 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1901 static int yaffs_read_super(struct file_system_type *fs,
1902 int flags, const char *dev_name,
1903 void *data, struct vfsmount *mnt)
1904 {
1905
1906 return get_sb_bdev(fs, flags, dev_name, data,
1907 yaffs_internal_read_super_mtd, mnt);
1908 }
1909 #else
1910 static struct super_block *yaffs_read_super(struct file_system_type *fs,
1911 int flags, const char *dev_name,
1912 void *data)
1913 {
1914
1915 return get_sb_bdev(fs, flags, dev_name, data,
1916 yaffs_internal_read_super_mtd);
1917 }
1918 #endif
1919
1920 static struct file_system_type yaffs_fs_type = {
1921 .owner = THIS_MODULE,
1922 .name = "yaffs",
1923 .get_sb = yaffs_read_super,
1924 .kill_sb = kill_block_super,
1925 .fs_flags = FS_REQUIRES_DEV,
1926 };
1927 #else
1928 static struct super_block *yaffs_read_super(struct super_block *sb, void *data,
1929 int silent)
1930 {
1931 return yaffs_internal_read_super(1, sb, data, silent);
1932 }
1933
1934 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super,
1935 FS_REQUIRES_DEV);
1936 #endif
1937
1938
1939 #ifdef CONFIG_YAFFS_YAFFS2
1940
1941 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1942 static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
1943 int silent)
1944 {
1945 return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
1946 }
1947
1948 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1949 static int yaffs2_read_super(struct file_system_type *fs,
1950 int flags, const char *dev_name, void *data,
1951 struct vfsmount *mnt)
1952 {
1953 return get_sb_bdev(fs, flags, dev_name, data,
1954 yaffs2_internal_read_super_mtd, mnt);
1955 }
1956 #else
1957 static struct super_block *yaffs2_read_super(struct file_system_type *fs,
1958 int flags, const char *dev_name,
1959 void *data)
1960 {
1961
1962 return get_sb_bdev(fs, flags, dev_name, data,
1963 yaffs2_internal_read_super_mtd);
1964 }
1965 #endif
1966
1967 static struct file_system_type yaffs2_fs_type = {
1968 .owner = THIS_MODULE,
1969 .name = "yaffs2",
1970 .get_sb = yaffs2_read_super,
1971 .kill_sb = kill_block_super,
1972 .fs_flags = FS_REQUIRES_DEV,
1973 };
1974 #else
1975 static struct super_block *yaffs2_read_super(struct super_block *sb,
1976 void *data, int silent)
1977 {
1978 return yaffs_internal_read_super(2, sb, data, silent);
1979 }
1980
1981 static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super,
1982 FS_REQUIRES_DEV);
1983 #endif
1984
1985 #endif /* CONFIG_YAFFS_YAFFS2 */
1986
1987 static struct proc_dir_entry *my_proc_entry;
1988
1989 static char *yaffs_dump_dev(char *buf, yaffs_Device * dev)
1990 {
1991 buf += sprintf(buf, "startBlock......... %d\n", dev->startBlock);
1992 buf += sprintf(buf, "endBlock........... %d\n", dev->endBlock);
1993 buf += sprintf(buf, "nDataBytesPerChunk. %d\n", dev->nDataBytesPerChunk);
1994 buf += sprintf(buf, "chunkGroupBits..... %d\n", dev->chunkGroupBits);
1995 buf += sprintf(buf, "chunkGroupSize..... %d\n", dev->chunkGroupSize);
1996 buf += sprintf(buf, "nErasedBlocks...... %d\n", dev->nErasedBlocks);
1997 buf += sprintf(buf, "nReservedBlocks.... %d\n", dev->nReservedBlocks);
1998 buf += sprintf(buf, "nCheckptResBlocks.. %d\n", dev->nCheckpointReservedBlocks);
1999 buf += sprintf(buf, "blocksInCheckpoint. %d\n", dev->blocksInCheckpoint);
2000 buf += sprintf(buf, "nTnodesCreated..... %d\n", dev->nTnodesCreated);
2001 buf += sprintf(buf, "nFreeTnodes........ %d\n", dev->nFreeTnodes);
2002 buf += sprintf(buf, "nObjectsCreated.... %d\n", dev->nObjectsCreated);
2003 buf += sprintf(buf, "nFreeObjects....... %d\n", dev->nFreeObjects);
2004 buf += sprintf(buf, "nFreeChunks........ %d\n", dev->nFreeChunks);
2005 buf += sprintf(buf, "nPageWrites........ %d\n", dev->nPageWrites);
2006 buf += sprintf(buf, "nPageReads......... %d\n", dev->nPageReads);
2007 buf += sprintf(buf, "nBlockErasures..... %d\n", dev->nBlockErasures);
2008 buf += sprintf(buf, "nGCCopies.......... %d\n", dev->nGCCopies);
2009 buf +=
2010 sprintf(buf, "garbageCollections. %d\n", dev->garbageCollections);
2011 buf +=
2012 sprintf(buf, "passiveGCs......... %d\n",
2013 dev->passiveGarbageCollections);
2014 buf += sprintf(buf, "nRetriedWrites..... %d\n", dev->nRetriedWrites);
2015 buf += sprintf(buf, "nShortOpCaches..... %d\n", dev->nShortOpCaches);
2016 buf += sprintf(buf, "nRetireBlocks...... %d\n", dev->nRetiredBlocks);
2017 buf += sprintf(buf, "eccFixed........... %d\n", dev->eccFixed);
2018 buf += sprintf(buf, "eccUnfixed......... %d\n", dev->eccUnfixed);
2019 buf += sprintf(buf, "tagsEccFixed....... %d\n", dev->tagsEccFixed);
2020 buf += sprintf(buf, "tagsEccUnfixed..... %d\n", dev->tagsEccUnfixed);
2021 buf += sprintf(buf, "cacheHits.......... %d\n", dev->cacheHits);
2022 buf += sprintf(buf, "nDeletedFiles...... %d\n", dev->nDeletedFiles);
2023 buf += sprintf(buf, "nUnlinkedFiles..... %d\n", dev->nUnlinkedFiles);
2024 buf +=
2025 sprintf(buf, "nBackgroudDeletions %d\n", dev->nBackgroundDeletions);
2026 buf += sprintf(buf, "useNANDECC......... %d\n", dev->useNANDECC);
2027 buf += sprintf(buf, "isYaffs2........... %d\n", dev->isYaffs2);
2028
2029 return buf;
2030 }
2031
2032 static int yaffs_proc_read(char *page,
2033 char **start,
2034 off_t offset, int count, int *eof, void *data)
2035 {
2036 struct list_head *item;
2037 char *buf = page;
2038 int step = offset;
2039 int n = 0;
2040
2041 /* Get proc_file_read() to step 'offset' by one on each sucessive call.
2042 * We use 'offset' (*ppos) to indicate where we are in devList.
2043 * This also assumes the user has posted a read buffer large
2044 * enough to hold the complete output; but that's life in /proc.
2045 */
2046
2047 *(int *)start = 1;
2048
2049 /* Print header first */
2050 if (step == 0) {
2051 buf += sprintf(buf, "YAFFS built:" __DATE__ " " __TIME__
2052 "\n%s\n%s\n", yaffs_fs_c_version,
2053 yaffs_guts_c_version);
2054 }
2055
2056 /* hold lock_kernel while traversing yaffs_dev_list */
2057 lock_kernel();
2058
2059 /* Locate and print the Nth entry. Order N-squared but N is small. */
2060 list_for_each(item, &yaffs_dev_list) {
2061 yaffs_Device *dev = list_entry(item, yaffs_Device, devList);
2062 if (n < step) {
2063 n++;
2064 continue;
2065 }
2066 buf += sprintf(buf, "\nDevice %d \"%s\"\n", n, dev->name);
2067 buf = yaffs_dump_dev(buf, dev);
2068 break;
2069 }
2070 unlock_kernel();
2071
2072 return buf - page < count ? buf - page : count;
2073 }
2074
2075 /**
2076 * Set the verbosity of the warnings and error messages.
2077 *
2078 * Note that the names can only be a..z or _ with the current code.
2079 */
2080
2081 static struct {
2082 char *mask_name;
2083 unsigned mask_bitfield;
2084 } mask_flags[] = {
2085 {"allocate", YAFFS_TRACE_ALLOCATE},
2086 {"always", YAFFS_TRACE_ALWAYS},
2087 {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
2088 {"buffers", YAFFS_TRACE_BUFFERS},
2089 {"bug", YAFFS_TRACE_BUG},
2090 {"checkpt", YAFFS_TRACE_CHECKPOINT},
2091 {"deletion", YAFFS_TRACE_DELETION},
2092 {"erase", YAFFS_TRACE_ERASE},
2093 {"error", YAFFS_TRACE_ERROR},
2094 {"gc_detail", YAFFS_TRACE_GC_DETAIL},
2095 {"gc", YAFFS_TRACE_GC},
2096 {"mtd", YAFFS_TRACE_MTD},
2097 {"nandaccess", YAFFS_TRACE_NANDACCESS},
2098 {"os", YAFFS_TRACE_OS},
2099 {"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
2100 {"scan", YAFFS_TRACE_SCAN},
2101 {"tracing", YAFFS_TRACE_TRACING},
2102
2103 {"verify", YAFFS_TRACE_VERIFY},
2104 {"verify_nand", YAFFS_TRACE_VERIFY_NAND},
2105 {"verify_full", YAFFS_TRACE_VERIFY_FULL},
2106 {"verify_all", YAFFS_TRACE_VERIFY_ALL},
2107
2108 {"write", YAFFS_TRACE_WRITE},
2109 {"all", 0xffffffff},
2110 {"none", 0},
2111 {NULL, 0},
2112 };
2113
2114 #define MAX_MASK_NAME_LENGTH 40
2115 static int yaffs_proc_write(struct file *file, const char *buf,
2116 unsigned long count, void *data)
2117 {
2118 unsigned rg = 0, mask_bitfield;
2119 char *end;
2120 char *mask_name;
2121 const char *x;
2122 char substring[MAX_MASK_NAME_LENGTH+1];
2123 int i;
2124 int done = 0;
2125 int add, len = 0;
2126 int pos = 0;
2127
2128 rg = yaffs_traceMask;
2129
2130 while (!done && (pos < count)) {
2131 done = 1;
2132 while ((pos < count) && isspace(buf[pos])) {
2133 pos++;
2134 }
2135
2136 switch (buf[pos]) {
2137 case '+':
2138 case '-':
2139 case '=':
2140 add = buf[pos];
2141 pos++;
2142 break;
2143
2144 default:
2145 add = ' ';
2146 break;
2147 }
2148 mask_name = NULL;
2149
2150 mask_bitfield = simple_strtoul(buf + pos, &end, 0);
2151 if (end > buf + pos) {
2152 mask_name = "numeral";
2153 len = end - (buf + pos);
2154 pos += len;
2155 done = 0;
2156 } else {
2157 for(x = buf + pos, i = 0;
2158 (*x == '_' || (*x >='a' && *x <= 'z')) &&
2159 i <MAX_MASK_NAME_LENGTH; x++, i++, pos++)
2160 substring[i] = *x;
2161 substring[i] = '\0';
2162
2163 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
2164 if(strcmp(substring,mask_flags[i].mask_name) == 0){
2165 mask_name = mask_flags[i].mask_name;
2166 mask_bitfield = mask_flags[i].mask_bitfield;
2167 done = 0;
2168 break;
2169 }
2170 }
2171 }
2172
2173 if (mask_name != NULL) {
2174 done = 0;
2175 switch(add) {
2176 case '-':
2177 rg &= ~mask_bitfield;
2178 break;
2179 case '+':
2180 rg |= mask_bitfield;
2181 break;
2182 case '=':
2183 rg = mask_bitfield;
2184 break;
2185 default:
2186 rg |= mask_bitfield;
2187 break;
2188 }
2189 }
2190 }
2191
2192 yaffs_traceMask = rg | YAFFS_TRACE_ALWAYS;
2193
2194 printk("new trace = 0x%08X\n",yaffs_traceMask);
2195
2196 if (rg & YAFFS_TRACE_ALWAYS) {
2197 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
2198 char flag;
2199 flag = ((rg & mask_flags[i].mask_bitfield) == mask_flags[i].mask_bitfield) ? '+' : '-';
2200 printk("%c%s\n", flag, mask_flags[i].mask_name);
2201 }
2202 }
2203
2204 return count;
2205 }
2206
2207 /* Stuff to handle installation of file systems */
2208 struct file_system_to_install {
2209 struct file_system_type *fst;
2210 int installed;
2211 };
2212
2213 static struct file_system_to_install fs_to_install[] = {
2214 //#ifdef CONFIG_YAFFS_YAFFS1
2215 {&yaffs_fs_type, 0},
2216 //#endif
2217 //#ifdef CONFIG_YAFFS_YAFFS2
2218 {&yaffs2_fs_type, 0},
2219 //#endif
2220 {NULL, 0}
2221 };
2222
2223 static int __init init_yaffs_fs(void)
2224 {
2225 int error = 0;
2226 struct file_system_to_install *fsinst;
2227
2228 T(YAFFS_TRACE_ALWAYS,
2229 ("yaffs " __DATE__ " " __TIME__ " Installing. \n"));
2230
2231 /* Install the proc_fs entry */
2232 my_proc_entry = create_proc_entry("yaffs",
2233 S_IRUGO | S_IFREG,
2234 &proc_root);
2235
2236 if (my_proc_entry) {
2237 my_proc_entry->write_proc = yaffs_proc_write;
2238 my_proc_entry->read_proc = yaffs_proc_read;
2239 my_proc_entry->data = NULL;
2240 } else {
2241 return -ENOMEM;
2242 }
2243
2244 /* Now add the file system entries */
2245
2246 fsinst = fs_to_install;
2247
2248 while (fsinst->fst && !error) {
2249 error = register_filesystem(fsinst->fst);
2250 if (!error) {
2251 fsinst->installed = 1;
2252 }
2253 fsinst++;
2254 }
2255
2256 /* Any errors? uninstall */
2257 if (error) {
2258 fsinst = fs_to_install;
2259
2260 while (fsinst->fst) {
2261 if (fsinst->installed) {
2262 unregister_filesystem(fsinst->fst);
2263 fsinst->installed = 0;
2264 }
2265 fsinst++;
2266 }
2267 }
2268
2269 return error;
2270 }
2271
2272 static void __exit exit_yaffs_fs(void)
2273 {
2274
2275 struct file_system_to_install *fsinst;
2276
2277 T(YAFFS_TRACE_ALWAYS, ("yaffs " __DATE__ " " __TIME__
2278 " removing. \n"));
2279
2280 remove_proc_entry("yaffs", &proc_root);
2281
2282 fsinst = fs_to_install;
2283
2284 while (fsinst->fst) {
2285 if (fsinst->installed) {
2286 unregister_filesystem(fsinst->fst);
2287 fsinst->installed = 0;
2288 }
2289 fsinst++;
2290 }
2291
2292 }
2293
2294 module_init(init_yaffs_fs)
2295 module_exit(exit_yaffs_fs)
2296
2297 MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
2298 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2006");
2299 MODULE_LICENSE("GPL");
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