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