1 /*
2 * YAFFS: Yet another FFS. A NAND-flash specific file system.
3 * yaffs_fs.c
4 *
5 * Copyright (C) 2002 Aleph One Ltd.
6 * for Toby Churchill Ltd and Brightstar Engineering
7 *
8 * Created by Charles Manning <charles@aleph1.co.uk>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 *
14 * This is the file system front-end to YAFFS that hooks it up to
15 * the VFS.
16 *
17 * Special notes:
18 * >> 2.4: sb->u.generic_sbp points to the yaffs_Device associated with
19 * this superblock
20 * >> 2.6: sb->s_fs_info points to the yaffs_Device associated with this
21 * superblock
22 * >> inode->u.generic_ip points to the associated yaffs_Object.
23 *
24 * Acknowledgements:
25 * * Luc van OostenRyck for numerous patches.
26 * * Nick Bane for numerous patches.
27 * * Nick Bane for 2.5/2.6 integration.
28 * * Andras Toth for mknod rdev issue.
29 * * Michael Fischer for finding the problem with inode inconsistency.
30 * * Some code bodily lifted from JFFS2.
31 */
32
33 const char *yaffs_fs_c_version =
34 "$Id: yaffs_fs.c,v 1.53 2006/10/03 10:13:03 charles Exp $";
35 extern const char *yaffs_guts_c_version;
36
37 #include <linux/config.h>
38 #include <linux/kernel.h>
39 #include <linux/module.h>
40 #include <linux/version.h>
41 #include <linux/slab.h>
42 #include <linux/init.h>
43 #include <linux/list.h>
44 #include <linux/fs.h>
45 #include <linux/proc_fs.h>
46 #include <linux/smp_lock.h>
47 #include <linux/pagemap.h>
48 #include <linux/mtd/mtd.h>
49 #include <linux/interrupt.h>
50 #include <linux/string.h>
51 #include <linux/ctype.h>
52
53 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
54
55 #include <linux/statfs.h> /* Added NCB 15-8-2003 */
56 #include <asm/statfs.h>
57 #define UnlockPage(p) unlock_page(p)
58 #define Page_Uptodate(page) test_bit(PG_uptodate, &(page)->flags)
59
60 /* FIXME: use sb->s_id instead ? */
61 #define yaffs_devname(sb, buf) bdevname(sb->s_bdev, buf)
62
63 #else
64
65 #include <linux/locks.h>
66 #define BDEVNAME_SIZE 0
67 #define yaffs_devname(sb, buf) kdevname(sb->s_dev)
68
69 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
70 /* added NCB 26/5/2006 for 2.4.25-vrs2-tcl1 kernel */
71 #define __user
72 #endif
73
74 #endif
75
76 #include <asm/uaccess.h>
77
78 #include "yportenv.h"
79 #include "yaffs_guts.h"
80
81 unsigned yaffs_traceMask = YAFFS_TRACE_ALWAYS |
82 YAFFS_TRACE_BAD_BLOCKS |
83 YAFFS_TRACE_CHECKPOINT
84 /* | 0xFFFFFFFF */;
85
86 #include <linux/mtd/mtd.h>
87 #include "yaffs_mtdif.h"
88 #include "yaffs_mtdif2.h"
89
90 /*#define T(x) printk x */
91
92 #define yaffs_InodeToObject(iptr) ((yaffs_Object *)((iptr)->u.generic_ip))
93 #define yaffs_DentryToObject(dptr) yaffs_InodeToObject((dptr)->d_inode)
94
95 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
96 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->s_fs_info)
97 #else
98 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->u.generic_sbp)
99 #endif
100
101 static void yaffs_put_super(struct super_block *sb);
102
103 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
104 loff_t * pos);
105
106 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
107 static int yaffs_file_flush(struct file *file, fl_owner_t id);
108 #else
109 static int yaffs_file_flush(struct file *file);
110 #endif
111
112 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
113 int datasync);
114
115 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
116
117 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
118 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
119 struct nameidata *n);
120 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
121 struct nameidata *n);
122 #else
123 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode);
124 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry);
125 #endif
126 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
127 struct dentry *dentry);
128 static int yaffs_unlink(struct inode *dir, struct dentry *dentry);
129 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
130 const char *symname);
131 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
132
133 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
134 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
135 dev_t dev);
136 #else
137 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
138 int dev);
139 #endif
140 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
141 struct inode *new_dir, struct dentry *new_dentry);
142 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr);
143
144 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
145 static int yaffs_sync_fs(struct super_block *sb, int wait);
146 static void yaffs_write_super(struct super_block *sb);
147 #else
148 static int yaffs_sync_fs(struct super_block *sb);
149 static int yaffs_write_super(struct super_block *sb);
150 #endif
151
152 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
153 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf);
154 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
155 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf);
156 #else
157 static int yaffs_statfs(struct super_block *sb, struct statfs *buf);
158 #endif
159 static void yaffs_read_inode(struct inode *inode);
160
161 static void yaffs_put_inode(struct inode *inode);
162 static void yaffs_delete_inode(struct inode *);
163 static void yaffs_clear_inode(struct inode *);
164
165 static int yaffs_readpage(struct file *file, struct page *page);
166 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
167 static int yaffs_writepage(struct page *page, struct writeback_control *wbc);
168 #else
169 static int yaffs_writepage(struct page *page);
170 #endif
171 static int yaffs_prepare_write(struct file *f, struct page *pg,
172 unsigned offset, unsigned to);
173 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
174 unsigned to);
175
176 static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
177 int buflen);
178 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
179 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
180 #else
181 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
182 #endif
183
184 static struct address_space_operations yaffs_file_address_operations = {
185 .readpage = yaffs_readpage,
186 .writepage = yaffs_writepage,
187 .prepare_write = yaffs_prepare_write,
188 .commit_write = yaffs_commit_write,
189 };
190
191 static struct file_operations yaffs_file_operations = {
192 .read = generic_file_read,
193 .write = generic_file_write,
194 .mmap = generic_file_mmap,
195 .flush = yaffs_file_flush,
196 .fsync = yaffs_sync_object,
197 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
198 .sendfile = generic_file_sendfile,
199 #endif
200
201 };
202
203 static struct inode_operations yaffs_file_inode_operations = {
204 .setattr = yaffs_setattr,
205 };
206
207 static struct inode_operations yaffs_symlink_inode_operations = {
208 .readlink = yaffs_readlink,
209 .follow_link = yaffs_follow_link,
210 .setattr = yaffs_setattr,
211 };
212
213 static struct inode_operations yaffs_dir_inode_operations = {
214 .create = yaffs_create,
215 .lookup = yaffs_lookup,
216 .link = yaffs_link,
217 .unlink = yaffs_unlink,
218 .symlink = yaffs_symlink,
219 .mkdir = yaffs_mkdir,
220 .rmdir = yaffs_unlink,
221 .mknod = yaffs_mknod,
222 .rename = yaffs_rename,
223 .setattr = yaffs_setattr,
224 };
225
226 static struct file_operations yaffs_dir_operations = {
227 .read = generic_read_dir,
228 .readdir = yaffs_readdir,
229 .fsync = yaffs_sync_object,
230 };
231
232 static struct super_operations yaffs_super_ops = {
233 .statfs = yaffs_statfs,
234 .read_inode = yaffs_read_inode,
235 .put_inode = yaffs_put_inode,
236 .put_super = yaffs_put_super,
237 .delete_inode = yaffs_delete_inode,
238 .clear_inode = yaffs_clear_inode,
239 .sync_fs = yaffs_sync_fs,
240 .write_super = yaffs_write_super,
241 };
242
yaffs_GrossLock(yaffs_Device * dev)243 static void yaffs_GrossLock(yaffs_Device * dev)
244 {
245 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs locking\n"));
246
247 down(&dev->grossLock);
248 }
249
yaffs_GrossUnlock(yaffs_Device * dev)250 static void yaffs_GrossUnlock(yaffs_Device * dev)
251 {
252 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs unlocking\n"));
253 up(&dev->grossLock);
254
255 }
256
yaffs_readlink(struct dentry * dentry,char __user * buffer,int buflen)257 static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
258 int buflen)
259 {
260 unsigned char *alias;
261 int ret;
262
263 yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
264
265 yaffs_GrossLock(dev);
266
267 alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
268
269 yaffs_GrossUnlock(dev);
270
271 if (!alias)
272 return -ENOMEM;
273
274 ret = vfs_readlink(dentry, buffer, buflen, alias);
275 kfree(alias);
276 return ret;
277 }
278
279 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
yaffs_follow_link(struct dentry * dentry,struct nameidata * nd)280 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
281 #else
282 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
283 #endif
284 {
285 unsigned char *alias;
286 int ret;
287 yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
288
289 yaffs_GrossLock(dev);
290
291 alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
292
293 yaffs_GrossUnlock(dev);
294
295 if (!alias)
296 {
297 ret = -ENOMEM;
298 goto out;
299 }
300
301 ret = vfs_follow_link(nd, alias);
302 kfree(alias);
303 out:
304 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
305 return ERR_PTR (ret);
306 #else
307 return ret;
308 #endif
309 }
310
311 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
312 yaffs_Object * obj);
313
314 /*
315 * Lookup is used to find objects in the fs
316 */
317 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
318
yaffs_lookup(struct inode * dir,struct dentry * dentry,struct nameidata * n)319 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
320 struct nameidata *n)
321 #else
322 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry)
323 #endif
324 {
325 yaffs_Object *obj;
326 struct inode *inode = NULL; /* NCB 2.5/2.6 needs NULL here */
327
328 yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev;
329
330 yaffs_GrossLock(dev);
331
332 T(YAFFS_TRACE_OS,
333 (KERN_DEBUG "yaffs_lookup for %d:%s\n",
334 yaffs_InodeToObject(dir)->objectId, dentry->d_name.name));
335
336 obj =
337 yaffs_FindObjectByName(yaffs_InodeToObject(dir),
338 dentry->d_name.name);
339
340 obj = yaffs_GetEquivalentObject(obj); /* in case it was a hardlink */
341
342 /* Can't hold gross lock when calling yaffs_get_inode() */
343 yaffs_GrossUnlock(dev);
344
345 if (obj) {
346 T(YAFFS_TRACE_OS,
347 (KERN_DEBUG "yaffs_lookup found %d\n", obj->objectId));
348
349 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
350
351 if (inode) {
352 T(YAFFS_TRACE_OS,
353 (KERN_DEBUG "yaffs_loookup dentry \n"));
354 /* #if 0 asserted by NCB for 2.5/6 compatability - falls through to
355 * d_add even if NULL inode */
356 #if 0
357 /*dget(dentry); // try to solve directory bug */
358 d_add(dentry, inode);
359
360 /* return dentry; */
361 return NULL;
362 #endif
363 }
364
365 } else {
366 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_lookup not found\n"));
367
368 }
369
370 /* added NCB for 2.5/6 compatability - forces add even if inode is
371 * NULL which creates dentry hash */
372 d_add(dentry, inode);
373
374 return NULL;
375 /* return (ERR_PTR(-EIO)); */
376
377 }
378
379 /* For now put inode is just for debugging
380 * Put inode is called when the inode **structure** is put.
381 */
yaffs_put_inode(struct inode * inode)382 static void yaffs_put_inode(struct inode *inode)
383 {
384 T(YAFFS_TRACE_OS,
385 ("yaffs_put_inode: ino %d, count %d\n", (int)inode->i_ino,
386 atomic_read(&inode->i_count)));
387
388 }
389
390 /* clear is called to tell the fs to release any per-inode data it holds */
yaffs_clear_inode(struct inode * inode)391 static void yaffs_clear_inode(struct inode *inode)
392 {
393 yaffs_Object *obj;
394 yaffs_Device *dev;
395
396 obj = yaffs_InodeToObject(inode);
397
398 T(YAFFS_TRACE_OS,
399 ("yaffs_clear_inode: ino %d, count %d %s\n", (int)inode->i_ino,
400 atomic_read(&inode->i_count),
401 obj ? "object exists" : "null object"));
402
403 if (obj) {
404 dev = obj->myDev;
405 yaffs_GrossLock(dev);
406
407 /* Clear the association between the inode and
408 * the yaffs_Object.
409 */
410 obj->myInode = NULL;
411 inode->u.generic_ip = NULL;
412
413 /* If the object freeing was deferred, then the real
414 * free happens now.
415 * This should fix the inode inconsistency problem.
416 */
417
418 yaffs_HandleDeferedFree(obj);
419
420 yaffs_GrossUnlock(dev);
421 }
422
423 }
424
425 /* delete is called when the link count is zero and the inode
426 * is put (ie. nobody wants to know about it anymore, time to
427 * delete the file).
428 * NB Must call clear_inode()
429 */
yaffs_delete_inode(struct inode * inode)430 static void yaffs_delete_inode(struct inode *inode)
431 {
432 yaffs_Object *obj = yaffs_InodeToObject(inode);
433 yaffs_Device *dev;
434
435 T(YAFFS_TRACE_OS,
436 ("yaffs_delete_inode: ino %d, count %d %s\n", (int)inode->i_ino,
437 atomic_read(&inode->i_count),
438 obj ? "object exists" : "null object"));
439
440 if (obj) {
441 dev = obj->myDev;
442 yaffs_GrossLock(dev);
443 yaffs_DeleteFile(obj);
444 yaffs_GrossUnlock(dev);
445 }
446 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
447 truncate_inode_pages (&inode->i_data, 0);
448 #endif
449 clear_inode(inode);
450 }
451
452 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
yaffs_file_flush(struct file * file,fl_owner_t id)453 static int yaffs_file_flush(struct file *file, fl_owner_t id)
454 #else
455 static int yaffs_file_flush(struct file *file)
456 #endif
457 {
458 yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry);
459
460 yaffs_Device *dev = obj->myDev;
461
462 T(YAFFS_TRACE_OS,
463 (KERN_DEBUG "yaffs_file_flush object %d (%s)\n", obj->objectId,
464 obj->dirty ? "dirty" : "clean"));
465
466 yaffs_GrossLock(dev);
467
468 yaffs_FlushFile(obj, 1);
469
470 yaffs_GrossUnlock(dev);
471
472 return 0;
473 }
474
yaffs_readpage_nolock(struct file * f,struct page * pg)475 static int yaffs_readpage_nolock(struct file *f, struct page *pg)
476 {
477 /* Lifted from jffs2 */
478
479 yaffs_Object *obj;
480 unsigned char *pg_buf;
481 int ret;
482
483 yaffs_Device *dev;
484
485 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_readpage at %08x, size %08x\n",
486 (unsigned)(pg->index << PAGE_CACHE_SHIFT),
487 (unsigned)PAGE_CACHE_SIZE));
488
489 obj = yaffs_DentryToObject(f->f_dentry);
490
491 dev = obj->myDev;
492
493 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
494 BUG_ON(!PageLocked(pg));
495 #else
496 if (!PageLocked(pg))
497 PAGE_BUG(pg);
498 #endif
499
500 pg_buf = kmap(pg);
501 /* FIXME: Can kmap fail? */
502
503 yaffs_GrossLock(dev);
504
505 ret =
506 yaffs_ReadDataFromFile(obj, pg_buf, pg->index << PAGE_CACHE_SHIFT,
507 PAGE_CACHE_SIZE);
508
509 yaffs_GrossUnlock(dev);
510
511 if (ret >= 0)
512 ret = 0;
513
514 if (ret) {
515 ClearPageUptodate(pg);
516 SetPageError(pg);
517 } else {
518 SetPageUptodate(pg);
519 ClearPageError(pg);
520 }
521
522 flush_dcache_page(pg);
523 kunmap(pg);
524
525 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_readpage done\n"));
526 return ret;
527 }
528
yaffs_readpage_unlock(struct file * f,struct page * pg)529 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
530 {
531 int ret = yaffs_readpage_nolock(f, pg);
532 UnlockPage(pg);
533 return ret;
534 }
535
yaffs_readpage(struct file * f,struct page * pg)536 static int yaffs_readpage(struct file *f, struct page *pg)
537 {
538 return yaffs_readpage_unlock(f, pg);
539 }
540
541 /* writepage inspired by/stolen from smbfs */
542
543 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
yaffs_writepage(struct page * page,struct writeback_control * wbc)544 static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
545 #else
546 static int yaffs_writepage(struct page *page)
547 #endif
548 {
549 struct address_space *mapping = page->mapping;
550 loff_t offset = (loff_t) page->index << PAGE_CACHE_SHIFT;
551 struct inode *inode;
552 unsigned long end_index;
553 char *buffer;
554 yaffs_Object *obj;
555 int nWritten = 0;
556 unsigned nBytes;
557
558 if (!mapping)
559 BUG();
560 inode = mapping->host;
561 if (!inode)
562 BUG();
563
564 if (offset > inode->i_size) {
565 T(YAFFS_TRACE_OS,
566 (KERN_DEBUG
567 "yaffs_writepage at %08x, inode size = %08x!!!\n",
568 (unsigned)(page->index << PAGE_CACHE_SHIFT),
569 (unsigned)inode->i_size));
570 T(YAFFS_TRACE_OS,
571 (KERN_DEBUG " -> don't care!!\n"));
572 unlock_page(page);
573 return 0;
574 }
575
576 end_index = inode->i_size >> PAGE_CACHE_SHIFT;
577
578 /* easy case */
579 if (page->index < end_index) {
580 nBytes = PAGE_CACHE_SIZE;
581 } else {
582 nBytes = inode->i_size & (PAGE_CACHE_SIZE - 1);
583 }
584
585 get_page(page);
586
587 buffer = kmap(page);
588
589 obj = yaffs_InodeToObject(inode);
590 yaffs_GrossLock(obj->myDev);
591
592 T(YAFFS_TRACE_OS,
593 (KERN_DEBUG "yaffs_writepage at %08x, size %08x\n",
594 (unsigned)(page->index << PAGE_CACHE_SHIFT), nBytes));
595 T(YAFFS_TRACE_OS,
596 (KERN_DEBUG "writepag0: obj = %05x, ino = %05x\n",
597 (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
598
599 nWritten =
600 yaffs_WriteDataToFile(obj, buffer, page->index << PAGE_CACHE_SHIFT,
601 nBytes, 0);
602
603 T(YAFFS_TRACE_OS,
604 (KERN_DEBUG "writepag1: obj = %05x, ino = %05x\n",
605 (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
606
607 yaffs_GrossUnlock(obj->myDev);
608
609 kunmap(page);
610 SetPageUptodate(page);
611 UnlockPage(page);
612 put_page(page);
613
614 return (nWritten == nBytes) ? 0 : -ENOSPC;
615 }
616
yaffs_prepare_write(struct file * f,struct page * pg,unsigned offset,unsigned to)617 static int yaffs_prepare_write(struct file *f, struct page *pg,
618 unsigned offset, unsigned to)
619 {
620
621 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_prepair_write\n"));
622 if (!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
623 return yaffs_readpage_nolock(f, pg);
624
625 return 0;
626
627 }
628
yaffs_commit_write(struct file * f,struct page * pg,unsigned offset,unsigned to)629 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
630 unsigned to)
631 {
632
633 void *addr = page_address(pg) + offset;
634 loff_t pos = (((loff_t) pg->index) << PAGE_CACHE_SHIFT) + offset;
635 int nBytes = to - offset;
636 int nWritten;
637
638 unsigned spos = pos;
639 unsigned saddr = (unsigned)addr;
640
641 T(YAFFS_TRACE_OS,
642 (KERN_DEBUG "yaffs_commit_write addr %x pos %x nBytes %d\n", saddr,
643 spos, nBytes));
644
645 nWritten = yaffs_file_write(f, addr, nBytes, &pos);
646
647 if (nWritten != nBytes) {
648 T(YAFFS_TRACE_OS,
649 (KERN_DEBUG
650 "yaffs_commit_write not same size nWritten %d nBytes %d\n",
651 nWritten, nBytes));
652 SetPageError(pg);
653 ClearPageUptodate(pg);
654 } else {
655 SetPageUptodate(pg);
656 }
657
658 T(YAFFS_TRACE_OS,
659 (KERN_DEBUG "yaffs_commit_write returning %d\n",
660 nWritten == nBytes ? 0 : nWritten));
661
662 return nWritten == nBytes ? 0 : nWritten;
663
664 }
665
yaffs_FillInodeFromObject(struct inode * inode,yaffs_Object * obj)666 static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object * obj)
667 {
668 if (inode && obj) {
669
670
671 /* Check mode against the variant type and attempt to repair if broken. */
672 __u32 mode = obj->yst_mode;
673 switch( obj->variantType ){
674 case YAFFS_OBJECT_TYPE_FILE :
675 if( ! S_ISREG(mode) ){
676 obj->yst_mode &= ~S_IFMT;
677 obj->yst_mode |= S_IFREG;
678 }
679
680 break;
681 case YAFFS_OBJECT_TYPE_SYMLINK :
682 if( ! S_ISLNK(mode) ){
683 obj->yst_mode &= ~S_IFMT;
684 obj->yst_mode |= S_IFLNK;
685 }
686
687 break;
688 case YAFFS_OBJECT_TYPE_DIRECTORY :
689 if( ! S_ISDIR(mode) ){
690 obj->yst_mode &= ~S_IFMT;
691 obj->yst_mode |= S_IFDIR;
692 }
693
694 break;
695 case YAFFS_OBJECT_TYPE_UNKNOWN :
696 case YAFFS_OBJECT_TYPE_HARDLINK :
697 case YAFFS_OBJECT_TYPE_SPECIAL :
698 default:
699 /* TODO? */
700 break;
701 }
702
703 inode->i_ino = obj->objectId;
704 inode->i_mode = obj->yst_mode;
705 inode->i_uid = obj->yst_uid;
706 inode->i_gid = obj->yst_gid;
707 inode->i_blksize = inode->i_sb->s_blocksize;
708 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
709
710 inode->i_rdev = old_decode_dev(obj->yst_rdev);
711 inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
712 inode->i_atime.tv_nsec = 0;
713 inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
714 inode->i_mtime.tv_nsec = 0;
715 inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
716 inode->i_ctime.tv_nsec = 0;
717 #else
718 inode->i_rdev = obj->yst_rdev;
719 inode->i_atime = obj->yst_atime;
720 inode->i_mtime = obj->yst_mtime;
721 inode->i_ctime = obj->yst_ctime;
722 #endif
723 inode->i_size = yaffs_GetObjectFileLength(obj);
724 inode->i_blocks = (inode->i_size + 511) >> 9;
725
726 inode->i_nlink = yaffs_GetObjectLinkCount(obj);
727
728 T(YAFFS_TRACE_OS,
729 (KERN_DEBUG
730 "yaffs_FillInode mode %x uid %d gid %d size %d count %d\n",
731 inode->i_mode, inode->i_uid, inode->i_gid,
732 (int)inode->i_size, atomic_read(&inode->i_count)));
733
734 switch (obj->yst_mode & S_IFMT) {
735 default: /* fifo, device or socket */
736 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
737 init_special_inode(inode, obj->yst_mode,
738 old_decode_dev(obj->yst_rdev));
739 #else
740 init_special_inode(inode, obj->yst_mode,
741 (dev_t) (obj->yst_rdev));
742 #endif
743 break;
744 case S_IFREG: /* file */
745 inode->i_op = &yaffs_file_inode_operations;
746 inode->i_fop = &yaffs_file_operations;
747 inode->i_mapping->a_ops =
748 &yaffs_file_address_operations;
749 break;
750 case S_IFDIR: /* directory */
751 inode->i_op = &yaffs_dir_inode_operations;
752 inode->i_fop = &yaffs_dir_operations;
753 break;
754 case S_IFLNK: /* symlink */
755 inode->i_op = &yaffs_symlink_inode_operations;
756 break;
757 }
758
759 inode->u.generic_ip = obj;
760 obj->myInode = inode;
761
762 } else {
763 T(YAFFS_TRACE_OS,
764 (KERN_DEBUG "yaffs_FileInode invalid parameters\n"));
765 }
766
767 }
768
yaffs_get_inode(struct super_block * sb,int mode,int dev,yaffs_Object * obj)769 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
770 yaffs_Object * obj)
771 {
772 struct inode *inode;
773
774 if (!sb) {
775 T(YAFFS_TRACE_OS,
776 (KERN_DEBUG "yaffs_get_inode for NULL super_block!!\n"));
777 return NULL;
778
779 }
780
781 if (!obj) {
782 T(YAFFS_TRACE_OS,
783 (KERN_DEBUG "yaffs_get_inode for NULL object!!\n"));
784 return NULL;
785
786 }
787
788 T(YAFFS_TRACE_OS,
789 (KERN_DEBUG "yaffs_get_inode for object %d\n", obj->objectId));
790
791 inode = iget(sb, obj->objectId);
792
793 /* NB Side effect: iget calls back to yaffs_read_inode(). */
794 /* iget also increments the inode's i_count */
795 /* NB You can't be holding grossLock or deadlock will happen! */
796
797 return inode;
798 }
799
yaffs_file_write(struct file * f,const char * buf,size_t n,loff_t * pos)800 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
801 loff_t * pos)
802 {
803 yaffs_Object *obj;
804 int nWritten, ipos;
805 struct inode *inode;
806 yaffs_Device *dev;
807
808 obj = yaffs_DentryToObject(f->f_dentry);
809
810 dev = obj->myDev;
811
812 yaffs_GrossLock(dev);
813
814 inode = f->f_dentry->d_inode;
815
816 if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND) {
817 ipos = inode->i_size;
818 } else {
819 ipos = *pos;
820 }
821
822 if (!obj) {
823 T(YAFFS_TRACE_OS,
824 (KERN_DEBUG "yaffs_file_write: hey obj is null!\n"));
825 } else {
826 T(YAFFS_TRACE_OS,
827 (KERN_DEBUG
828 "yaffs_file_write about to write writing %d bytes"
829 "to object %d at %d\n",
830 n, obj->objectId, ipos));
831 }
832
833 nWritten = yaffs_WriteDataToFile(obj, buf, ipos, n, 0);
834
835 T(YAFFS_TRACE_OS,
836 (KERN_DEBUG "yaffs_file_write writing %d bytes, %d written at %d\n",
837 n, nWritten, ipos));
838 if (nWritten > 0) {
839 ipos += nWritten;
840 *pos = ipos;
841 if (ipos > inode->i_size) {
842 inode->i_size = ipos;
843 inode->i_blocks = (ipos + 511) >> 9;
844
845 T(YAFFS_TRACE_OS,
846 (KERN_DEBUG
847 "yaffs_file_write size updated to %d bytes, "
848 "%d blocks\n",
849 ipos, (int)(inode->i_blocks)));
850 }
851
852 }
853 yaffs_GrossUnlock(dev);
854 return nWritten == 0 ? -ENOSPC : nWritten;
855 }
856
yaffs_readdir(struct file * f,void * dirent,filldir_t filldir)857 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
858 {
859 yaffs_Object *obj;
860 yaffs_Device *dev;
861 struct inode *inode = f->f_dentry->d_inode;
862 unsigned long offset, curoffs;
863 struct list_head *i;
864 yaffs_Object *l;
865
866 char name[YAFFS_MAX_NAME_LENGTH + 1];
867
868 obj = yaffs_DentryToObject(f->f_dentry);
869 dev = obj->myDev;
870
871 yaffs_GrossLock(dev);
872
873 offset = f->f_pos;
874
875 T(YAFFS_TRACE_OS, ("yaffs_readdir: starting at %d\n", (int)offset));
876
877 if (offset == 0) {
878 T(YAFFS_TRACE_OS,
879 (KERN_DEBUG "yaffs_readdir: entry . ino %d \n",
880 (int)inode->i_ino));
881 if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR)
882 < 0) {
883 goto out;
884 }
885 offset++;
886 f->f_pos++;
887 }
888 if (offset == 1) {
889 T(YAFFS_TRACE_OS,
890 (KERN_DEBUG "yaffs_readdir: entry .. ino %d \n",
891 (int)f->f_dentry->d_parent->d_inode->i_ino));
892 if (filldir
893 (dirent, "..", 2, offset,
894 f->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
895 goto out;
896 }
897 offset++;
898 f->f_pos++;
899 }
900
901 curoffs = 1;
902
903 /* If the directory has changed since the open or last call to
904 readdir, rewind to after the 2 canned entries. */
905
906 if (f->f_version != inode->i_version) {
907 offset = 2;
908 f->f_pos = offset;
909 f->f_version = inode->i_version;
910 }
911
912 list_for_each(i, &obj->variant.directoryVariant.children) {
913 curoffs++;
914 if (curoffs >= offset) {
915 l = list_entry(i, yaffs_Object, siblings);
916
917 yaffs_GetObjectName(l, name,
918 YAFFS_MAX_NAME_LENGTH + 1);
919 T(YAFFS_TRACE_OS,
920 (KERN_DEBUG "yaffs_readdir: %s inode %d\n", name,
921 yaffs_GetObjectInode(l)));
922
923 if (filldir(dirent,
924 name,
925 strlen(name),
926 offset,
927 yaffs_GetObjectInode(l),
928 yaffs_GetObjectType(l))
929 < 0) {
930 goto up_and_out;
931 }
932
933 offset++;
934 f->f_pos++;
935 }
936 }
937
938 up_and_out:
939 out:
940
941 yaffs_GrossUnlock(dev);
942
943 return 0;
944 }
945
946 /*
947 * File creation. Allocate an inode, and we're done..
948 */
949 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
yaffs_mknod(struct inode * dir,struct dentry * dentry,int mode,dev_t rdev)950 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
951 dev_t rdev)
952 #else
953 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
954 int rdev)
955 #endif
956 {
957 struct inode *inode;
958
959 yaffs_Object *obj = NULL;
960 yaffs_Device *dev;
961
962 yaffs_Object *parent = yaffs_InodeToObject(dir);
963
964 int error = -ENOSPC;
965 uid_t uid = current->fsuid;
966 gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
967
968 if((dir->i_mode & S_ISGID) && S_ISDIR(mode))
969 mode |= S_ISGID;
970
971 if (parent) {
972 T(YAFFS_TRACE_OS,
973 (KERN_DEBUG "yaffs_mknod: parent object %d type %d\n",
974 parent->objectId, parent->variantType));
975 } else {
976 T(YAFFS_TRACE_OS,
977 (KERN_DEBUG "yaffs_mknod: could not get parent object\n"));
978 return -EPERM;
979 }
980
981 T(YAFFS_TRACE_OS, ("yaffs_mknod: making oject for %s, "
982 "mode %x dev %x\n",
983 dentry->d_name.name, mode, rdev));
984
985 dev = parent->myDev;
986
987 yaffs_GrossLock(dev);
988
989 switch (mode & S_IFMT) {
990 default:
991 /* Special (socket, fifo, device...) */
992 T(YAFFS_TRACE_OS, (KERN_DEBUG
993 "yaffs_mknod: making special\n"));
994 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
995 obj =
996 yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
997 gid, old_encode_dev(rdev));
998 #else
999 obj =
1000 yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
1001 gid, rdev);
1002 #endif
1003 break;
1004 case S_IFREG: /* file */
1005 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_mknod: making file\n"));
1006 obj =
1007 yaffs_MknodFile(parent, dentry->d_name.name, mode, uid,
1008 gid);
1009 break;
1010 case S_IFDIR: /* directory */
1011 T(YAFFS_TRACE_OS,
1012 (KERN_DEBUG "yaffs_mknod: making directory\n"));
1013 obj =
1014 yaffs_MknodDirectory(parent, dentry->d_name.name, mode,
1015 uid, gid);
1016 break;
1017 case S_IFLNK: /* symlink */
1018 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_mknod: making file\n"));
1019 obj = NULL; /* Do we ever get here? */
1020 break;
1021 }
1022
1023 /* Can not call yaffs_get_inode() with gross lock held */
1024 yaffs_GrossUnlock(dev);
1025
1026 if (obj) {
1027 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
1028 d_instantiate(dentry, inode);
1029 T(YAFFS_TRACE_OS,
1030 (KERN_DEBUG "yaffs_mknod created object %d count = %d\n",
1031 obj->objectId, atomic_read(&inode->i_count)));
1032 error = 0;
1033 } else {
1034 T(YAFFS_TRACE_OS,
1035 (KERN_DEBUG "yaffs_mknod failed making object\n"));
1036 error = -ENOMEM;
1037 }
1038
1039 return error;
1040 }
1041
yaffs_mkdir(struct inode * dir,struct dentry * dentry,int mode)1042 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1043 {
1044 int retVal;
1045 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_mkdir\n"));
1046 retVal = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
1047 #if 0
1048 /* attempt to fix dir bug - didn't work */
1049 if (!retVal) {
1050 dget(dentry);
1051 }
1052 #endif
1053 return retVal;
1054 }
1055
1056 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
yaffs_create(struct inode * dir,struct dentry * dentry,int mode,struct nameidata * n)1057 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
1058 struct nameidata *n)
1059 #else
1060 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
1061 #endif
1062 {
1063 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_create\n"));
1064 return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
1065 }
1066
yaffs_unlink(struct inode * dir,struct dentry * dentry)1067 static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
1068 {
1069 int retVal;
1070
1071 yaffs_Device *dev;
1072
1073 T(YAFFS_TRACE_OS,
1074 (KERN_DEBUG "yaffs_unlink %d:%s\n", (int)(dir->i_ino),
1075 dentry->d_name.name));
1076
1077 dev = yaffs_InodeToObject(dir)->myDev;
1078
1079 yaffs_GrossLock(dev);
1080
1081 retVal = yaffs_Unlink(yaffs_InodeToObject(dir), dentry->d_name.name);
1082
1083 if (retVal == YAFFS_OK) {
1084 dentry->d_inode->i_nlink--;
1085 dir->i_version++;
1086 yaffs_GrossUnlock(dev);
1087 mark_inode_dirty(dentry->d_inode);
1088 return 0;
1089 }
1090 yaffs_GrossUnlock(dev);
1091 return -ENOTEMPTY;
1092 }
1093
1094 /*
1095 * Create a link...
1096 */
yaffs_link(struct dentry * old_dentry,struct inode * dir,struct dentry * dentry)1097 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
1098 struct dentry *dentry)
1099 {
1100 struct inode *inode = old_dentry->d_inode;
1101 yaffs_Object *obj = NULL;
1102 yaffs_Object *link = NULL;
1103 yaffs_Device *dev;
1104
1105 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_link\n"));
1106
1107 obj = yaffs_InodeToObject(inode);
1108 dev = obj->myDev;
1109
1110 yaffs_GrossLock(dev);
1111
1112 if (!S_ISDIR(inode->i_mode)) /* Don't link directories */
1113 {
1114 link =
1115 yaffs_Link(yaffs_InodeToObject(dir), dentry->d_name.name,
1116 obj);
1117 }
1118
1119 if (link) {
1120 old_dentry->d_inode->i_nlink = yaffs_GetObjectLinkCount(obj);
1121 d_instantiate(dentry, old_dentry->d_inode);
1122 atomic_inc(&old_dentry->d_inode->i_count);
1123 T(YAFFS_TRACE_OS,
1124 (KERN_DEBUG "yaffs_link link count %d i_count %d\n",
1125 old_dentry->d_inode->i_nlink,
1126 atomic_read(&old_dentry->d_inode->i_count)));
1127
1128 }
1129
1130 yaffs_GrossUnlock(dev);
1131
1132 if (link) {
1133
1134 return 0;
1135 }
1136
1137 return -EPERM;
1138 }
1139
yaffs_symlink(struct inode * dir,struct dentry * dentry,const char * symname)1140 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
1141 const char *symname)
1142 {
1143 yaffs_Object *obj;
1144 yaffs_Device *dev;
1145 uid_t uid = current->fsuid;
1146 gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
1147
1148 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_symlink\n"));
1149
1150 dev = yaffs_InodeToObject(dir)->myDev;
1151 yaffs_GrossLock(dev);
1152 obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name,
1153 S_IFLNK | S_IRWXUGO, uid, gid, symname);
1154 yaffs_GrossUnlock(dev);
1155
1156 if (obj) {
1157
1158 struct inode *inode;
1159
1160 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
1161 d_instantiate(dentry, inode);
1162 T(YAFFS_TRACE_OS, (KERN_DEBUG "symlink created OK\n"));
1163 return 0;
1164 } else {
1165 T(YAFFS_TRACE_OS, (KERN_DEBUG "symlink not created\n"));
1166
1167 }
1168
1169 return -ENOMEM;
1170 }
1171
yaffs_sync_object(struct file * file,struct dentry * dentry,int datasync)1172 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
1173 int datasync)
1174 {
1175
1176 yaffs_Object *obj;
1177 yaffs_Device *dev;
1178
1179 obj = yaffs_DentryToObject(dentry);
1180
1181 dev = obj->myDev;
1182
1183 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_sync_object\n"));
1184 yaffs_GrossLock(dev);
1185 yaffs_FlushFile(obj, 1);
1186 yaffs_GrossUnlock(dev);
1187 return 0;
1188 }
1189
1190 /*
1191 * The VFS layer already does all the dentry stuff for rename.
1192 *
1193 * NB: POSIX says you can rename an object over an old object of the same name
1194 */
yaffs_rename(struct inode * old_dir,struct dentry * old_dentry,struct inode * new_dir,struct dentry * new_dentry)1195 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
1196 struct inode *new_dir, struct dentry *new_dentry)
1197 {
1198 yaffs_Device *dev;
1199 int retVal = YAFFS_FAIL;
1200 yaffs_Object *target;
1201
1202 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_rename\n"));
1203 dev = yaffs_InodeToObject(old_dir)->myDev;
1204
1205 yaffs_GrossLock(dev);
1206
1207 /* Check if the target is an existing directory that is not empty. */
1208 target =
1209 yaffs_FindObjectByName(yaffs_InodeToObject(new_dir),
1210 new_dentry->d_name.name);
1211
1212
1213
1214 if (target &&
1215 target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
1216 !list_empty(&target->variant.directoryVariant.children)) {
1217
1218 T(YAFFS_TRACE_OS, (KERN_DEBUG "target is non-empty dir\n"));
1219
1220 retVal = YAFFS_FAIL;
1221 } else {
1222
1223 /* Now does unlinking internally using shadowing mechanism */
1224 T(YAFFS_TRACE_OS, (KERN_DEBUG "calling yaffs_RenameObject\n"));
1225
1226 retVal =
1227 yaffs_RenameObject(yaffs_InodeToObject(old_dir),
1228 old_dentry->d_name.name,
1229 yaffs_InodeToObject(new_dir),
1230 new_dentry->d_name.name);
1231
1232 }
1233 yaffs_GrossUnlock(dev);
1234
1235 if (retVal == YAFFS_OK) {
1236 if(target) {
1237 new_dentry->d_inode->i_nlink--;
1238 mark_inode_dirty(new_dentry->d_inode);
1239 }
1240
1241 return 0;
1242 } else {
1243 return -ENOTEMPTY;
1244 }
1245
1246 }
1247
yaffs_setattr(struct dentry * dentry,struct iattr * attr)1248 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
1249 {
1250 struct inode *inode = dentry->d_inode;
1251 int error;
1252 yaffs_Device *dev;
1253
1254 T(YAFFS_TRACE_OS,
1255 (KERN_DEBUG "yaffs_setattr of object %d\n",
1256 yaffs_InodeToObject(inode)->objectId));
1257
1258 if ((error = inode_change_ok(inode, attr)) == 0) {
1259
1260 dev = yaffs_InodeToObject(inode)->myDev;
1261 yaffs_GrossLock(dev);
1262 if (yaffs_SetAttributes(yaffs_InodeToObject(inode), attr) ==
1263 YAFFS_OK) {
1264 error = 0;
1265 } else {
1266 error = -EPERM;
1267 }
1268 yaffs_GrossUnlock(dev);
1269 if (!error)
1270 error = inode_setattr(inode, attr);
1271 }
1272 return error;
1273 }
1274
1275 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
yaffs_statfs(struct dentry * dentry,struct kstatfs * buf)1276 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
1277 {
1278 yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
1279 struct super_block *sb = dentry->d_sb;
1280 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1281 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
1282 {
1283 yaffs_Device *dev = yaffs_SuperToDevice(sb);
1284 #else
1285 static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
1286 {
1287 yaffs_Device *dev = yaffs_SuperToDevice(sb);
1288 #endif
1289
1290 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_statfs\n"));
1291
1292 yaffs_GrossLock(dev);
1293
1294 buf->f_type = YAFFS_MAGIC;
1295 buf->f_bsize = sb->s_blocksize;
1296 buf->f_namelen = 255;
1297 if (sb->s_blocksize > dev->nDataBytesPerChunk) {
1298
1299 buf->f_blocks =
1300 (dev->endBlock - dev->startBlock +
1301 1) * dev->nChunksPerBlock / (sb->s_blocksize /
1302 dev->nDataBytesPerChunk);
1303 buf->f_bfree =
1304 yaffs_GetNumberOfFreeChunks(dev) / (sb->s_blocksize /
1305 dev->nDataBytesPerChunk);
1306 } else {
1307
1308 buf->f_blocks =
1309 (dev->endBlock - dev->startBlock +
1310 1) * dev->nChunksPerBlock * (dev->nDataBytesPerChunk /
1311 sb->s_blocksize);
1312 buf->f_bfree =
1313 yaffs_GetNumberOfFreeChunks(dev) * (dev->nDataBytesPerChunk /
1314 sb->s_blocksize);
1315 }
1316 buf->f_files = 0;
1317 buf->f_ffree = 0;
1318 buf->f_bavail = buf->f_bfree;
1319
1320 yaffs_GrossUnlock(dev);
1321 return 0;
1322 }
1323
1324
1325
1326 static int yaffs_do_sync_fs(struct super_block *sb)
1327 {
1328
1329 yaffs_Device *dev = yaffs_SuperToDevice(sb);
1330 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_do_sync_fs\n"));
1331
1332 if(sb->s_dirt) {
1333 yaffs_GrossLock(dev);
1334
1335 if(dev)
1336 yaffs_CheckpointSave(dev);
1337
1338 yaffs_GrossUnlock(dev);
1339
1340 sb->s_dirt = 0;
1341 }
1342 return 0;
1343 }
1344
1345
1346 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1347 static void yaffs_write_super(struct super_block *sb)
1348 #else
1349 static int yaffs_write_super(struct super_block *sb)
1350 #endif
1351 {
1352
1353 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_write_super\n"));
1354 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18))
1355 return 0; /* yaffs_do_sync_fs(sb);*/
1356 #endif
1357 }
1358
1359
1360 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1361 static int yaffs_sync_fs(struct super_block *sb, int wait)
1362 #else
1363 static int yaffs_sync_fs(struct super_block *sb)
1364 #endif
1365 {
1366
1367 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_sync_fs\n"));
1368
1369 return 0; /* yaffs_do_sync_fs(sb);*/
1370
1371 }
1372
1373
1374 static void yaffs_read_inode(struct inode *inode)
1375 {
1376 /* NB This is called as a side effect of other functions, but
1377 * we had to release the lock to prevent deadlocks, so
1378 * need to lock again.
1379 */
1380
1381 yaffs_Object *obj;
1382 yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
1383
1384 T(YAFFS_TRACE_OS,
1385 (KERN_DEBUG "yaffs_read_inode for %d\n", (int)inode->i_ino));
1386
1387 yaffs_GrossLock(dev);
1388
1389 obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
1390
1391 yaffs_FillInodeFromObject(inode, obj);
1392
1393 yaffs_GrossUnlock(dev);
1394 }
1395
1396 static LIST_HEAD(yaffs_dev_list);
1397
1398 static void yaffs_put_super(struct super_block *sb)
1399 {
1400 yaffs_Device *dev = yaffs_SuperToDevice(sb);
1401
1402 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_put_super\n"));
1403
1404 yaffs_GrossLock(dev);
1405
1406 yaffs_FlushEntireDeviceCache(dev);
1407
1408 if (dev->putSuperFunc) {
1409 dev->putSuperFunc(sb);
1410 }
1411
1412 yaffs_CheckpointSave(dev);
1413 yaffs_Deinitialise(dev);
1414
1415 yaffs_GrossUnlock(dev);
1416
1417 /* we assume this is protected by lock_kernel() in mount/umount */
1418 list_del(&dev->devList);
1419
1420 if(dev->spareBuffer){
1421 YFREE(dev->spareBuffer);
1422 dev->spareBuffer = NULL;
1423 }
1424
1425 kfree(dev);
1426 }
1427
1428
1429 static void yaffs_MTDPutSuper(struct super_block *sb)
1430 {
1431
1432 struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1433
1434 if (mtd->sync) {
1435 mtd->sync(mtd);
1436 }
1437
1438 put_mtd_device(mtd);
1439 }
1440
1441
1442 static void yaffs_MarkSuperBlockDirty(void *vsb)
1443 {
1444 struct super_block *sb = (struct super_block *)vsb;
1445
1446 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_MarkSuperBlockDirty() sb = %p\n",sb));
1447 // if(sb)
1448 // sb->s_dirt = 1;
1449 }
1450
1451 static struct super_block *yaffs_internal_read_super(int yaffsVersion,
1452 struct super_block *sb,
1453 void *data, int silent)
1454 {
1455 int nBlocks;
1456 struct inode *inode = NULL;
1457 struct dentry *root;
1458 yaffs_Device *dev = 0;
1459 char devname_buf[BDEVNAME_SIZE + 1];
1460 struct mtd_info *mtd;
1461 int err;
1462
1463 sb->s_magic = YAFFS_MAGIC;
1464 sb->s_op = &yaffs_super_ops;
1465
1466 if (!sb)
1467 printk(KERN_INFO "yaffs: sb is NULL\n");
1468 else if (!sb->s_dev)
1469 printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
1470 else if (!yaffs_devname(sb, devname_buf))
1471 printk(KERN_INFO "yaffs: devname is NULL\n");
1472 else
1473 printk(KERN_INFO "yaffs: dev is %d name is \"%s\"\n",
1474 sb->s_dev,
1475 yaffs_devname(sb, devname_buf));
1476
1477 sb->s_blocksize = PAGE_CACHE_SIZE;
1478 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1479 T(YAFFS_TRACE_OS, ("yaffs_read_super: Using yaffs%d\n", yaffsVersion));
1480 T(YAFFS_TRACE_OS,
1481 ("yaffs_read_super: block size %d\n", (int)(sb->s_blocksize)));
1482
1483 #ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
1484 T(YAFFS_TRACE_OS,
1485 ("yaffs: Write verification disabled. All guarantees "
1486 "null and void\n"));
1487 #endif
1488
1489 T(YAFFS_TRACE_ALWAYS, ("yaffs: Attempting MTD mount on %u.%u, "
1490 "\"%s\"\n",
1491 MAJOR(sb->s_dev), MINOR(sb->s_dev),
1492 yaffs_devname(sb, devname_buf)));
1493
1494 /* Check it's an mtd device..... */
1495 if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR) {
1496 return NULL; /* This isn't an mtd device */
1497 }
1498 /* Get the device */
1499 mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
1500 if (!mtd) {
1501 T(YAFFS_TRACE_ALWAYS,
1502 ("yaffs: MTD device #%u doesn't appear to exist\n",
1503 MINOR(sb->s_dev)));
1504 return NULL;
1505 }
1506 /* Check it's NAND */
1507 if (mtd->type != MTD_NANDFLASH) {
1508 T(YAFFS_TRACE_ALWAYS,
1509 ("yaffs: MTD device is not NAND it's type %d\n", mtd->type));
1510 return NULL;
1511 }
1512
1513 T(YAFFS_TRACE_OS, (" erase %p\n", mtd->erase));
1514 T(YAFFS_TRACE_OS, (" read %p\n", mtd->read));
1515 T(YAFFS_TRACE_OS, (" write %p\n", mtd->write));
1516 T(YAFFS_TRACE_OS, (" readoob %p\n", mtd->read_oob));
1517 T(YAFFS_TRACE_OS, (" writeoob %p\n", mtd->write_oob));
1518 T(YAFFS_TRACE_OS, (" block_isbad %p\n", mtd->block_isbad));
1519 T(YAFFS_TRACE_OS, (" block_markbad %p\n", mtd->block_markbad));
1520 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1521 T(YAFFS_TRACE_OS, (" writesize %d\n", mtd->writesize));
1522 #else
1523 T(YAFFS_TRACE_OS, (" oobblock %d\n", mtd->oobblock));
1524 #endif
1525 T(YAFFS_TRACE_OS, (" oobsize %d\n", mtd->oobsize));
1526 T(YAFFS_TRACE_OS, (" erasesize %d\n", mtd->erasesize));
1527 T(YAFFS_TRACE_OS, (" size %d\n", mtd->size));
1528
1529 #ifdef CONFIG_YAFFS_AUTO_YAFFS2
1530
1531 if (yaffsVersion == 1 &&
1532 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1533 mtd->writesize >= 2048) {
1534 #else
1535 mtd->oobblock >= 2048) {
1536 #endif
1537 T(YAFFS_TRACE_ALWAYS,("yaffs: auto selecting yaffs2\n"));
1538 yaffsVersion = 2;
1539 }
1540
1541 /* Added NCB 26/5/2006 for completeness */
1542 if (yaffsVersion == 2 &&
1543 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1544 mtd->writesize == 512) {
1545 #else
1546 mtd->oobblock >= 512) {
1547 #endif
1548 T(YAFFS_TRACE_ALWAYS,("yaffs: auto selecting yaffs1\n"));
1549 yaffsVersion = 1;
1550 }
1551
1552 #endif
1553
1554 if (yaffsVersion == 2) {
1555 /* Check for version 2 style functions */
1556 if (!mtd->erase ||
1557 !mtd->block_isbad ||
1558 !mtd->block_markbad ||
1559 !mtd->read ||
1560 !mtd->write ||
1561 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1562 !mtd->read_oob || !mtd->write_oob) {
1563 #else
1564 !mtd->write_ecc ||
1565 !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
1566 #endif
1567 T(YAFFS_TRACE_ALWAYS,
1568 ("yaffs: MTD device does not support required "
1569 "functions\n"));;
1570 return NULL;
1571 }
1572
1573 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1574 if (mtd->writesize < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
1575 #else
1576 if (mtd->oobblock < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
1577 #endif
1578 mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) {
1579 T(YAFFS_TRACE_ALWAYS,
1580 ("yaffs: MTD device does not have the "
1581 "right page sizes\n"));
1582 return NULL;
1583 }
1584 } else {
1585 /* Check for V1 style functions */
1586 if (!mtd->erase ||
1587 !mtd->read ||
1588 !mtd->write ||
1589 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1590 !mtd->read_oob || !mtd->write_oob) {
1591 #else
1592 !mtd->write_ecc ||
1593 !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
1594 #endif
1595 T(YAFFS_TRACE_ALWAYS,
1596 ("yaffs: MTD device does not support required "
1597 "functions\n"));;
1598 return NULL;
1599 }
1600
1601 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1602 if (mtd->writesize < YAFFS_BYTES_PER_CHUNK ||
1603 #else
1604 if (mtd->oobblock < YAFFS_BYTES_PER_CHUNK ||
1605 #endif
1606 mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
1607 T(YAFFS_TRACE_ALWAYS,
1608 ("yaffs: MTD device does not support have the "
1609 "right page sizes\n"));
1610 return NULL;
1611 }
1612 }
1613
1614 /* OK, so if we got here, we have an MTD that's NAND and looks
1615 * like it has the right capabilities
1616 * Set the yaffs_Device up for mtd
1617 */
1618
1619 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1620 sb->s_fs_info = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
1621 #else
1622 sb->u.generic_sbp = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
1623 #endif
1624 if (!dev) {
1625 /* Deep shit could not allocate device structure */
1626 T(YAFFS_TRACE_ALWAYS,
1627 ("yaffs_read_super: Failed trying to allocate "
1628 "yaffs_Device. \n"));
1629 return NULL;
1630 }
1631
1632 memset(dev, 0, sizeof(yaffs_Device));
1633 dev->genericDevice = mtd;
1634 dev->name = mtd->name;
1635
1636 /* Set up the memory size parameters.... */
1637
1638 nBlocks = mtd->size / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
1639 dev->startBlock = 0;
1640 dev->endBlock = nBlocks - 1;
1641 dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
1642 dev->nDataBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
1643 dev->nReservedBlocks = 5;
1644 dev->nShortOpCaches = 10; /* Enable short op caching */
1645
1646 /* ... and the functions. */
1647 if (yaffsVersion == 2) {
1648 dev->writeChunkWithTagsToNAND =
1649 nandmtd2_WriteChunkWithTagsToNAND;
1650 dev->readChunkWithTagsFromNAND =
1651 nandmtd2_ReadChunkWithTagsFromNAND;
1652 dev->markNANDBlockBad = nandmtd2_MarkNANDBlockBad;
1653 dev->queryNANDBlock = nandmtd2_QueryNANDBlock;
1654 dev->spareBuffer = YMALLOC(mtd->oobsize);
1655 dev->isYaffs2 = 1;
1656 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1657 dev->nDataBytesPerChunk = mtd->writesize;
1658 dev->nChunksPerBlock = mtd->erasesize / mtd->writesize;
1659 #else
1660 dev->nDataBytesPerChunk = mtd->oobblock;
1661 dev->nChunksPerBlock = mtd->erasesize / mtd->oobblock;
1662 #endif
1663 nBlocks = mtd->size / mtd->erasesize;
1664
1665 dev->nCheckpointReservedBlocks = 10;
1666 dev->startBlock = 0;
1667 dev->endBlock = nBlocks - 1;
1668 } else {
1669 dev->writeChunkToNAND = nandmtd_WriteChunkToNAND;
1670 dev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
1671 dev->isYaffs2 = 0;
1672 }
1673 /* ... and common functions */
1674 dev->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
1675 dev->initialiseNAND = nandmtd_InitialiseNAND;
1676
1677 dev->putSuperFunc = yaffs_MTDPutSuper;
1678
1679 dev->superBlock = (void *)sb;
1680 dev->markSuperBlockDirty = yaffs_MarkSuperBlockDirty;
1681
1682
1683 #ifndef CONFIG_YAFFS_DOES_ECC
1684 dev->useNANDECC = 1;
1685 #endif
1686
1687 #ifdef CONFIG_YAFFS_DISABLE_WIDE_TNODES
1688 dev->wideTnodesDisabled = 1;
1689 #endif
1690
1691 /* we assume this is protected by lock_kernel() in mount/umount */
1692 list_add_tail(&dev->devList, &yaffs_dev_list);
1693
1694 init_MUTEX(&dev->grossLock);
1695
1696 yaffs_GrossLock(dev);
1697
1698 #ifdef CONFIG_YAFFS_ERASE_MOUNT_OPTION
1699 if(data && strcmp((char *) data, "erase") == 0) {
1700 int i;
1701 T(YAFFS_TRACE_ALWAYS,
1702 ("yaffs_read_super: Erasing device\n"));
1703 for(i = 0; i < nBlocks; i++)
1704 dev->eraseBlockInNAND(dev, i);
1705 }
1706 #endif
1707
1708 err = yaffs_GutsInitialise(dev);
1709
1710 T(YAFFS_TRACE_OS,
1711 ("yaffs_read_super: guts initialised %s\n",
1712 (err == YAFFS_OK) ? "OK" : "FAILED"));
1713
1714 /* Release lock before yaffs_get_inode() */
1715 yaffs_GrossUnlock(dev);
1716
1717 /* Create root inode */
1718 if (err == YAFFS_OK)
1719 inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,
1720 yaffs_Root(dev));
1721
1722 if (!inode)
1723 return NULL;
1724
1725 inode->i_op = &yaffs_dir_inode_operations;
1726 inode->i_fop = &yaffs_dir_operations;
1727
1728 T(YAFFS_TRACE_OS, ("yaffs_read_super: got root inode\n"));
1729
1730 root = d_alloc_root(inode);
1731
1732 T(YAFFS_TRACE_OS, ("yaffs_read_super: d_alloc_root done\n"));
1733
1734 if (!root) {
1735 iput(inode);
1736 return NULL;
1737 }
1738 sb->s_root = root;
1739
1740 T(YAFFS_TRACE_OS, ("yaffs_read_super: done\n"));
1741 return sb;
1742 }
1743
1744
1745 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1746 static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
1747 int silent)
1748 {
1749 return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
1750 }
1751
1752 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1753 static int yaffs_read_super(struct file_system_type *fs,
1754 int flags, const char *dev_name,
1755 void *data, struct vfsmount *mnt)
1756 {
1757
1758 return get_sb_bdev(fs, flags, dev_name, data,
1759 yaffs_internal_read_super_mtd, mnt);
1760 }
1761 #else
1762 static struct super_block *yaffs_read_super(struct file_system_type *fs,
1763 int flags, const char *dev_name,
1764 void *data)
1765 {
1766
1767 return get_sb_bdev(fs, flags, dev_name, data,
1768 yaffs_internal_read_super_mtd);
1769 }
1770 #endif
1771
1772 static struct file_system_type yaffs_fs_type = {
1773 .owner = THIS_MODULE,
1774 .name = "yaffs",
1775 .get_sb = yaffs_read_super,
1776 .kill_sb = kill_block_super,
1777 .fs_flags = FS_REQUIRES_DEV,
1778 };
1779 #else
1780 static struct super_block *yaffs_read_super(struct super_block *sb, void *data,
1781 int silent)
1782 {
1783 return yaffs_internal_read_super(1, sb, data, silent);
1784 }
1785
1786 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super,
1787 FS_REQUIRES_DEV);
1788 #endif
1789
1790
1791 #ifdef CONFIG_YAFFS_YAFFS2
1792
1793 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1794 static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
1795 int silent)
1796 {
1797 return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
1798 }
1799
1800 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1801 static int yaffs2_read_super(struct file_system_type *fs,
1802 int flags, const char *dev_name, void *data,
1803 struct vfsmount *mnt)
1804 {
1805 return get_sb_bdev(fs, flags, dev_name, data,
1806 yaffs2_internal_read_super_mtd, mnt);
1807 }
1808 #else
1809 static struct super_block *yaffs2_read_super(struct file_system_type *fs,
1810 int flags, const char *dev_name,
1811 void *data)
1812 {
1813
1814 return get_sb_bdev(fs, flags, dev_name, data,
1815 yaffs2_internal_read_super_mtd);
1816 }
1817 #endif
1818
1819 static struct file_system_type yaffs2_fs_type = {
1820 .owner = THIS_MODULE,
1821 .name = "yaffs2",
1822 .get_sb = yaffs2_read_super,
1823 .kill_sb = kill_block_super,
1824 .fs_flags = FS_REQUIRES_DEV,
1825 };
1826 #else
1827 static struct super_block *yaffs2_read_super(struct super_block *sb,
1828 void *data, int silent)
1829 {
1830 return yaffs_internal_read_super(2, sb, data, silent);
1831 }
1832
1833 static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super,
1834 FS_REQUIRES_DEV);
1835 #endif
1836
1837 #endif /* CONFIG_YAFFS_YAFFS2 */
1838
1839 static struct proc_dir_entry *my_proc_entry;
1840
1841 static char *yaffs_dump_dev(char *buf, yaffs_Device * dev)
1842 {
1843 buf += sprintf(buf, "startBlock......... %d\n", dev->startBlock);
1844 buf += sprintf(buf, "endBlock........... %d\n", dev->endBlock);
1845 buf += sprintf(buf, "chunkGroupBits..... %d\n", dev->chunkGroupBits);
1846 buf += sprintf(buf, "chunkGroupSize..... %d\n", dev->chunkGroupSize);
1847 buf += sprintf(buf, "nErasedBlocks...... %d\n", dev->nErasedBlocks);
1848 buf += sprintf(buf, "nTnodesCreated..... %d\n", dev->nTnodesCreated);
1849 buf += sprintf(buf, "nFreeTnodes........ %d\n", dev->nFreeTnodes);
1850 buf += sprintf(buf, "nObjectsCreated.... %d\n", dev->nObjectsCreated);
1851 buf += sprintf(buf, "nFreeObjects....... %d\n", dev->nFreeObjects);
1852 buf += sprintf(buf, "nFreeChunks........ %d\n", dev->nFreeChunks);
1853 buf += sprintf(buf, "nPageWrites........ %d\n", dev->nPageWrites);
1854 buf += sprintf(buf, "nPageReads......... %d\n", dev->nPageReads);
1855 buf += sprintf(buf, "nBlockErasures..... %d\n", dev->nBlockErasures);
1856 buf += sprintf(buf, "nGCCopies.......... %d\n", dev->nGCCopies);
1857 buf +=
1858 sprintf(buf, "garbageCollections. %d\n", dev->garbageCollections);
1859 buf +=
1860 sprintf(buf, "passiveGCs......... %d\n",
1861 dev->passiveGarbageCollections);
1862 buf += sprintf(buf, "nRetriedWrites..... %d\n", dev->nRetriedWrites);
1863 buf += sprintf(buf, "nRetireBlocks...... %d\n", dev->nRetiredBlocks);
1864 buf += sprintf(buf, "eccFixed........... %d\n", dev->eccFixed);
1865 buf += sprintf(buf, "eccUnfixed......... %d\n", dev->eccUnfixed);
1866 buf += sprintf(buf, "tagsEccFixed....... %d\n", dev->tagsEccFixed);
1867 buf += sprintf(buf, "tagsEccUnfixed..... %d\n", dev->tagsEccUnfixed);
1868 buf += sprintf(buf, "cacheHits.......... %d\n", dev->cacheHits);
1869 buf += sprintf(buf, "nDeletedFiles...... %d\n", dev->nDeletedFiles);
1870 buf += sprintf(buf, "nUnlinkedFiles..... %d\n", dev->nUnlinkedFiles);
1871 buf +=
1872 sprintf(buf, "nBackgroudDeletions %d\n", dev->nBackgroundDeletions);
1873 buf += sprintf(buf, "useNANDECC......... %d\n", dev->useNANDECC);
1874 buf += sprintf(buf, "isYaffs2........... %d\n", dev->isYaffs2);
1875
1876 return buf;
1877 }
1878
1879 static int yaffs_proc_read(char *page,
1880 char **start,
1881 off_t offset, int count, int *eof, void *data)
1882 {
1883 struct list_head *item;
1884 char *buf = page;
1885 int step = offset;
1886 int n = 0;
1887
1888 /* Get proc_file_read() to step 'offset' by one on each sucessive call.
1889 * We use 'offset' (*ppos) to indicate where we are in devList.
1890 * This also assumes the user has posted a read buffer large
1891 * enough to hold the complete output; but that's life in /proc.
1892 */
1893
1894 *(int *)start = 1;
1895
1896 /* Print header first */
1897 if (step == 0) {
1898 buf += sprintf(buf, "YAFFS built:" __DATE__ " " __TIME__
1899 "\n%s\n%s\n", yaffs_fs_c_version,
1900 yaffs_guts_c_version);
1901 }
1902
1903 /* hold lock_kernel while traversing yaffs_dev_list */
1904 lock_kernel();
1905
1906 /* Locate and print the Nth entry. Order N-squared but N is small. */
1907 list_for_each(item, &yaffs_dev_list) {
1908 yaffs_Device *dev = list_entry(item, yaffs_Device, devList);
1909 if (n < step) {
1910 n++;
1911 continue;
1912 }
1913 buf += sprintf(buf, "\nDevice %d \"%s\"\n", n, dev->name);
1914 buf = yaffs_dump_dev(buf, dev);
1915 break;
1916 }
1917 unlock_kernel();
1918
1919 return buf - page < count ? buf - page : count;
1920 }
1921
1922 /**
1923 * Set the verbosity of the warnings and error messages.
1924 *
1925 */
1926
1927 static struct {
1928 char *mask_name;
1929 unsigned mask_bitfield;
1930 } mask_flags[] = {
1931 {"allocate", YAFFS_TRACE_ALLOCATE},
1932 {"always", YAFFS_TRACE_ALWAYS},
1933 {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
1934 {"buffers", YAFFS_TRACE_BUFFERS},
1935 {"bug", YAFFS_TRACE_BUG},
1936 {"deletion", YAFFS_TRACE_DELETION},
1937 {"erase", YAFFS_TRACE_ERASE},
1938 {"error", YAFFS_TRACE_ERROR},
1939 {"gc_detail", YAFFS_TRACE_GC_DETAIL},
1940 {"gc", YAFFS_TRACE_GC},
1941 {"mtd", YAFFS_TRACE_MTD},
1942 {"nandaccess", YAFFS_TRACE_NANDACCESS},
1943 {"os", YAFFS_TRACE_OS},
1944 {"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
1945 {"scan", YAFFS_TRACE_SCAN},
1946 {"tracing", YAFFS_TRACE_TRACING},
1947 {"write", YAFFS_TRACE_WRITE},
1948 {"all", 0xffffffff},
1949 {"none", 0},
1950 {NULL, 0},
1951 };
1952
1953 static int yaffs_proc_write(struct file *file, const char *buf,
1954 unsigned long count, void *data)
1955 {
1956 unsigned rg = 0, mask_bitfield;
1957 char *end, *mask_name;
1958 int i;
1959 int done = 0;
1960 int add, len;
1961 int pos = 0;
1962
1963 rg = yaffs_traceMask;
1964
1965 while (!done && (pos < count)) {
1966 done = 1;
1967 while ((pos < count) && isspace(buf[pos])) {
1968 pos++;
1969 }
1970
1971 switch (buf[pos]) {
1972 case '+':
1973 case '-':
1974 case '=':
1975 add = buf[pos];
1976 pos++;
1977 break;
1978
1979 default:
1980 add = ' ';
1981 break;
1982 }
1983 mask_name = NULL;
1984 mask_bitfield = simple_strtoul(buf + pos, &end, 0);
1985 if (end > buf + pos) {
1986 mask_name = "numeral";
1987 len = end - (buf + pos);
1988 done = 0;
1989 } else {
1990
1991 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
1992 len = strlen(mask_flags[i].mask_name);
1993 if (strncmp(buf + pos, mask_flags[i].mask_name, len) == 0) {
1994 mask_name = mask_flags[i].mask_name;
1995 mask_bitfield = mask_flags[i].mask_bitfield;
1996 done = 0;
1997 break;
1998 }
1999 }
2000 }
2001
2002 if (mask_name != NULL) {
2003 pos += len;
2004 done = 0;
2005 switch(add) {
2006 case '-':
2007 rg &= ~mask_bitfield;
2008 break;
2009 case '+':
2010 rg |= mask_bitfield;
2011 break;
2012 case '=':
2013 rg = mask_bitfield;
2014 break;
2015 default:
2016 rg |= mask_bitfield;
2017 break;
2018 }
2019 }
2020 }
2021
2022 yaffs_traceMask = rg;
2023 if (rg & YAFFS_TRACE_ALWAYS) {
2024 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
2025 char flag;
2026 flag = ((rg & mask_flags[i].mask_bitfield) == mask_flags[i].mask_bitfield) ? '+' : '-';
2027 printk("%c%s\n", flag, mask_flags[i].mask_name);
2028 }
2029 }
2030
2031 return count;
2032 }
2033
2034 /* Stuff to handle installation of file systems */
2035 struct file_system_to_install {
2036 struct file_system_type *fst;
2037 int installed;
2038 };
2039
2040 static struct file_system_to_install fs_to_install[] = {
2041 //#ifdef CONFIG_YAFFS_YAFFS1
2042 {&yaffs_fs_type, 0},
2043 //#endif
2044 //#ifdef CONFIG_YAFFS_YAFFS2
2045 {&yaffs2_fs_type, 0},
2046 //#endif
2047 {NULL, 0}
2048 };
2049
2050 static int __init init_yaffs_fs(void)
2051 {
2052 int error = 0;
2053 struct file_system_to_install *fsinst;
2054
2055 T(YAFFS_TRACE_ALWAYS,
2056 ("yaffs " __DATE__ " " __TIME__ " Installing. \n"));
2057
2058 /* Install the proc_fs entry */
2059 my_proc_entry = create_proc_entry("yaffs",
2060 S_IRUGO | S_IFREG,
2061 &proc_root);
2062
2063 if (my_proc_entry) {
2064 my_proc_entry->write_proc = yaffs_proc_write;
2065 my_proc_entry->read_proc = yaffs_proc_read;
2066 my_proc_entry->data = NULL;
2067 } else {
2068 return -ENOMEM;
2069 }
2070
2071 /* Now add the file system entries */
2072
2073 fsinst = fs_to_install;
2074
2075 while (fsinst->fst && !error) {
2076 error = register_filesystem(fsinst->fst);
2077 if (!error) {
2078 fsinst->installed = 1;
2079 }
2080 fsinst++;
2081 }
2082
2083 /* Any errors? uninstall */
2084 if (error) {
2085 fsinst = fs_to_install;
2086
2087 while (fsinst->fst) {
2088 if (fsinst->installed) {
2089 unregister_filesystem(fsinst->fst);
2090 fsinst->installed = 0;
2091 }
2092 fsinst++;
2093 }
2094 }
2095
2096 return error;
2097 }
2098
2099 static void __exit exit_yaffs_fs(void)
2100 {
2101
2102 struct file_system_to_install *fsinst;
2103
2104 T(YAFFS_TRACE_ALWAYS, ("yaffs " __DATE__ " " __TIME__
2105 " removing. \n"));
2106
2107 remove_proc_entry("yaffs", &proc_root);
2108
2109 fsinst = fs_to_install;
2110
2111 while (fsinst->fst) {
2112 if (fsinst->installed) {
2113 unregister_filesystem(fsinst->fst);
2114 fsinst->installed = 0;
2115 }
2116 fsinst++;
2117 }
2118
2119 }
2120
2121 module_init(init_yaffs_fs)
2122 module_exit(exit_yaffs_fs)
2123
2124 MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
2125 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2006");
2126 MODULE_LICENSE("GPL");
2127