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generic: fold yaffs_cvs_2009_04_24 patch to generic/files
[openwrt/staging/yousong.git] / target / linux / generic / files / fs / yaffs2 / yaffs_fs.c
1 /*
2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
3 *
4 * Copyright (C) 2002-2009 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
6 *
7 * Created by Charles Manning <charles@aleph1.co.uk>
8 * Acknowledgements:
9 * Luc van OostenRyck for numerous patches.
10 * Nick Bane for numerous patches.
11 * Nick Bane for 2.5/2.6 integration.
12 * Andras Toth for mknod rdev issue.
13 * Michael Fischer for finding the problem with inode inconsistency.
14 * Some code bodily lifted from JFFS
15 *
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License version 2 as
18 * published by the Free Software Foundation.
19 */
20
21 /*
22 *
23 * This is the file system front-end to YAFFS that hooks it up to
24 * the VFS.
25 *
26 * Special notes:
27 * >> 2.4: sb->u.generic_sbp points to the yaffs_Device associated with
28 * this superblock
29 * >> 2.6: sb->s_fs_info points to the yaffs_Device associated with this
30 * superblock
31 * >> inode->u.generic_ip points to the associated yaffs_Object.
32 */
33
34 const char *yaffs_fs_c_version =
35 "$Id: yaffs_fs.c,v 1.79 2009-03-17 01:12:00 wookey Exp $";
36 extern const char *yaffs_guts_c_version;
37
38 #include <linux/version.h>
39 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
40 #include <linux/config.h>
41 #endif
42 #include <linux/kernel.h>
43 #include <linux/module.h>
44 #include <linux/slab.h>
45 #include <linux/init.h>
46 #include <linux/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 #include "asm/div64.h"
56
57 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
58
59 #include <linux/statfs.h> /* Added NCB 15-8-2003 */
60 #include <linux/statfs.h>
61 #define UnlockPage(p) unlock_page(p)
62 #define Page_Uptodate(page) test_bit(PG_uptodate, &(page)->flags)
63
64 /* FIXME: use sb->s_id instead ? */
65 #define yaffs_devname(sb, buf) bdevname(sb->s_bdev, buf)
66
67 #else
68
69 #include <linux/locks.h>
70 #define BDEVNAME_SIZE 0
71 #define yaffs_devname(sb, buf) kdevname(sb->s_dev)
72
73 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0))
74 /* added NCB 26/5/2006 for 2.4.25-vrs2-tcl1 kernel */
75 #define __user
76 #endif
77
78 #endif
79
80 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26))
81 #define YPROC_ROOT (&proc_root)
82 #else
83 #define YPROC_ROOT NULL
84 #endif
85
86 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
87 #define WRITE_SIZE_STR "writesize"
88 #define WRITE_SIZE(mtd) ((mtd)->writesize)
89 #else
90 #define WRITE_SIZE_STR "oobblock"
91 #define WRITE_SIZE(mtd) ((mtd)->oobblock)
92 #endif
93
94 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 27))
95 #define YAFFS_USE_WRITE_BEGIN_END 1
96 #else
97 #define YAFFS_USE_WRITE_BEGIN_END 0
98 #endif
99
100 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 28))
101 static uint32_t YCALCBLOCKS(uint64_t partition_size, uint32_t block_size)
102 {
103 uint64_t result = partition_size;
104 do_div(result, block_size);
105 return (uint32_t)result;
106 }
107 #else
108 #define YCALCBLOCKS(s, b) ((s)/(b))
109 #endif
110
111 #include <linux/uaccess.h>
112
113 #include "yportenv.h"
114 #include "yaffs_guts.h"
115
116 #include <linux/mtd/mtd.h>
117 #include "yaffs_mtdif.h"
118 #include "yaffs_mtdif1.h"
119 #include "yaffs_mtdif2.h"
120
121 unsigned int yaffs_traceMask = YAFFS_TRACE_BAD_BLOCKS;
122 unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS;
123 unsigned int yaffs_auto_checkpoint = 1;
124
125 /* Module Parameters */
126 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
127 module_param(yaffs_traceMask, uint, 0644);
128 module_param(yaffs_wr_attempts, uint, 0644);
129 module_param(yaffs_auto_checkpoint, uint, 0644);
130 #else
131 MODULE_PARM(yaffs_traceMask, "i");
132 MODULE_PARM(yaffs_wr_attempts, "i");
133 MODULE_PARM(yaffs_auto_checkpoint, "i");
134 #endif
135
136 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25))
137 /* use iget and read_inode */
138 #define Y_IGET(sb, inum) iget((sb), (inum))
139 static void yaffs_read_inode(struct inode *inode);
140
141 #else
142 /* Call local equivalent */
143 #define YAFFS_USE_OWN_IGET
144 #define Y_IGET(sb, inum) yaffs_iget((sb), (inum))
145
146 static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino);
147 #endif
148
149 /*#define T(x) printk x */
150
151 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
152 #define yaffs_InodeToObjectLV(iptr) ((iptr)->i_private)
153 #else
154 #define yaffs_InodeToObjectLV(iptr) ((iptr)->u.generic_ip)
155 #endif
156
157 #define yaffs_InodeToObject(iptr) ((yaffs_Object *)(yaffs_InodeToObjectLV(iptr)))
158 #define yaffs_DentryToObject(dptr) yaffs_InodeToObject((dptr)->d_inode)
159
160 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
161 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->s_fs_info)
162 #else
163 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->u.generic_sbp)
164 #endif
165
166 static void yaffs_put_super(struct super_block *sb);
167
168 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
169 loff_t *pos);
170 static ssize_t yaffs_hold_space(struct file *f);
171 static void yaffs_release_space(struct file *f);
172
173 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
174 static int yaffs_file_flush(struct file *file, fl_owner_t id);
175 #else
176 static int yaffs_file_flush(struct file *file);
177 #endif
178
179 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
180 int datasync);
181
182 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
183
184 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
185 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
186 struct nameidata *n);
187 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
188 struct nameidata *n);
189 #else
190 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode);
191 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry);
192 #endif
193 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
194 struct dentry *dentry);
195 static int yaffs_unlink(struct inode *dir, struct dentry *dentry);
196 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
197 const char *symname);
198 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
199
200 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
201 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
202 dev_t dev);
203 #else
204 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
205 int dev);
206 #endif
207 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
208 struct inode *new_dir, struct dentry *new_dentry);
209 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr);
210
211 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
212 static int yaffs_sync_fs(struct super_block *sb, int wait);
213 static void yaffs_write_super(struct super_block *sb);
214 #else
215 static int yaffs_sync_fs(struct super_block *sb);
216 static int yaffs_write_super(struct super_block *sb);
217 #endif
218
219 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
220 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf);
221 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
222 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf);
223 #else
224 static int yaffs_statfs(struct super_block *sb, struct statfs *buf);
225 #endif
226
227 #ifdef YAFFS_HAS_PUT_INODE
228 static void yaffs_put_inode(struct inode *inode);
229 #endif
230
231 static void yaffs_delete_inode(struct inode *);
232 static void yaffs_clear_inode(struct inode *);
233
234 static int yaffs_readpage(struct file *file, struct page *page);
235 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
236 static int yaffs_writepage(struct page *page, struct writeback_control *wbc);
237 #else
238 static int yaffs_writepage(struct page *page);
239 #endif
240
241
242 #if (YAFFS_USE_WRITE_BEGIN_END != 0)
243 static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
244 loff_t pos, unsigned len, unsigned flags,
245 struct page **pagep, void **fsdata);
246 static int yaffs_write_end(struct file *filp, struct address_space *mapping,
247 loff_t pos, unsigned len, unsigned copied,
248 struct page *pg, void *fsdadata);
249 #else
250 static int yaffs_prepare_write(struct file *f, struct page *pg,
251 unsigned offset, unsigned to);
252 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
253 unsigned to);
254
255 #endif
256
257 static int yaffs_readlink(struct dentry *dentry, char __user *buffer,
258 int buflen);
259 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
260 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
261 #else
262 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
263 #endif
264
265 static struct address_space_operations yaffs_file_address_operations = {
266 .readpage = yaffs_readpage,
267 .writepage = yaffs_writepage,
268 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
269 .write_begin = yaffs_write_begin,
270 .write_end = yaffs_write_end,
271 #else
272 .prepare_write = yaffs_prepare_write,
273 .commit_write = yaffs_commit_write,
274 #endif
275 };
276
277 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 22))
278 static const struct file_operations yaffs_file_operations = {
279 .read = do_sync_read,
280 .write = do_sync_write,
281 .aio_read = generic_file_aio_read,
282 .aio_write = generic_file_aio_write,
283 .mmap = generic_file_mmap,
284 .flush = yaffs_file_flush,
285 .fsync = yaffs_sync_object,
286 .splice_read = generic_file_splice_read,
287 .splice_write = generic_file_splice_write,
288 .llseek = generic_file_llseek,
289 };
290
291 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
292
293 static const struct file_operations yaffs_file_operations = {
294 .read = do_sync_read,
295 .write = do_sync_write,
296 .aio_read = generic_file_aio_read,
297 .aio_write = generic_file_aio_write,
298 .mmap = generic_file_mmap,
299 .flush = yaffs_file_flush,
300 .fsync = yaffs_sync_object,
301 .sendfile = generic_file_sendfile,
302 };
303
304 #else
305
306 static const struct file_operations yaffs_file_operations = {
307 .read = generic_file_read,
308 .write = generic_file_write,
309 .mmap = generic_file_mmap,
310 .flush = yaffs_file_flush,
311 .fsync = yaffs_sync_object,
312 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
313 .sendfile = generic_file_sendfile,
314 #endif
315 };
316 #endif
317
318 static const struct inode_operations yaffs_file_inode_operations = {
319 .setattr = yaffs_setattr,
320 };
321
322 static const struct inode_operations yaffs_symlink_inode_operations = {
323 .readlink = yaffs_readlink,
324 .follow_link = yaffs_follow_link,
325 .setattr = yaffs_setattr,
326 };
327
328 static const struct inode_operations yaffs_dir_inode_operations = {
329 .create = yaffs_create,
330 .lookup = yaffs_lookup,
331 .link = yaffs_link,
332 .unlink = yaffs_unlink,
333 .symlink = yaffs_symlink,
334 .mkdir = yaffs_mkdir,
335 .rmdir = yaffs_unlink,
336 .mknod = yaffs_mknod,
337 .rename = yaffs_rename,
338 .setattr = yaffs_setattr,
339 };
340
341 static const struct file_operations yaffs_dir_operations = {
342 .read = generic_read_dir,
343 .readdir = yaffs_readdir,
344 .fsync = yaffs_sync_object,
345 };
346
347 static const struct super_operations yaffs_super_ops = {
348 .statfs = yaffs_statfs,
349
350 #ifndef YAFFS_USE_OWN_IGET
351 .read_inode = yaffs_read_inode,
352 #endif
353 #ifdef YAFFS_HAS_PUT_INODE
354 .put_inode = yaffs_put_inode,
355 #endif
356 .put_super = yaffs_put_super,
357 .delete_inode = yaffs_delete_inode,
358 .clear_inode = yaffs_clear_inode,
359 .sync_fs = yaffs_sync_fs,
360 .write_super = yaffs_write_super,
361 };
362
363 static void yaffs_GrossLock(yaffs_Device *dev)
364 {
365 T(YAFFS_TRACE_OS, ("yaffs locking %p\n", current));
366 down(&dev->grossLock);
367 T(YAFFS_TRACE_OS, ("yaffs locked %p\n", current));
368 }
369
370 static void yaffs_GrossUnlock(yaffs_Device *dev)
371 {
372 T(YAFFS_TRACE_OS, ("yaffs unlocking %p\n", current));
373 up(&dev->grossLock);
374 }
375
376 static int yaffs_readlink(struct dentry *dentry, char __user *buffer,
377 int buflen)
378 {
379 unsigned char *alias;
380 int ret;
381
382 yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
383
384 yaffs_GrossLock(dev);
385
386 alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
387
388 yaffs_GrossUnlock(dev);
389
390 if (!alias)
391 return -ENOMEM;
392
393 ret = vfs_readlink(dentry, buffer, buflen, alias);
394 kfree(alias);
395 return ret;
396 }
397
398 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
399 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
400 #else
401 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
402 #endif
403 {
404 unsigned char *alias;
405 int ret;
406 yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
407
408 yaffs_GrossLock(dev);
409
410 alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
411
412 yaffs_GrossUnlock(dev);
413
414 if (!alias) {
415 ret = -ENOMEM;
416 goto out;
417 }
418
419 ret = vfs_follow_link(nd, alias);
420 kfree(alias);
421 out:
422 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
423 return ERR_PTR(ret);
424 #else
425 return ret;
426 #endif
427 }
428
429 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
430 yaffs_Object *obj);
431
432 /*
433 * Lookup is used to find objects in the fs
434 */
435 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
436
437 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
438 struct nameidata *n)
439 #else
440 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry)
441 #endif
442 {
443 yaffs_Object *obj;
444 struct inode *inode = NULL; /* NCB 2.5/2.6 needs NULL here */
445
446 yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev;
447
448 yaffs_GrossLock(dev);
449
450 T(YAFFS_TRACE_OS,
451 ("yaffs_lookup for %d:%s\n",
452 yaffs_InodeToObject(dir)->objectId, dentry->d_name.name));
453
454 obj = yaffs_FindObjectByName(yaffs_InodeToObject(dir),
455 dentry->d_name.name);
456
457 obj = yaffs_GetEquivalentObject(obj); /* in case it was a hardlink */
458
459 /* Can't hold gross lock when calling yaffs_get_inode() */
460 yaffs_GrossUnlock(dev);
461
462 if (obj) {
463 T(YAFFS_TRACE_OS,
464 ("yaffs_lookup found %d\n", obj->objectId));
465
466 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
467
468 if (inode) {
469 T(YAFFS_TRACE_OS,
470 ("yaffs_loookup dentry \n"));
471 /* #if 0 asserted by NCB for 2.5/6 compatability - falls through to
472 * d_add even if NULL inode */
473 #if 0
474 /*dget(dentry); // try to solve directory bug */
475 d_add(dentry, inode);
476
477 /* return dentry; */
478 return NULL;
479 #endif
480 }
481
482 } else {
483 T(YAFFS_TRACE_OS, ("yaffs_lookup not found\n"));
484
485 }
486
487 /* added NCB for 2.5/6 compatability - forces add even if inode is
488 * NULL which creates dentry hash */
489 d_add(dentry, inode);
490
491 return NULL;
492 }
493
494
495 #ifdef YAFFS_HAS_PUT_INODE
496
497 /* For now put inode is just for debugging
498 * Put inode is called when the inode **structure** is put.
499 */
500 static void yaffs_put_inode(struct inode *inode)
501 {
502 T(YAFFS_TRACE_OS,
503 ("yaffs_put_inode: ino %d, count %d\n", (int)inode->i_ino,
504 atomic_read(&inode->i_count)));
505
506 }
507 #endif
508
509 /* clear is called to tell the fs to release any per-inode data it holds */
510 static void yaffs_clear_inode(struct inode *inode)
511 {
512 yaffs_Object *obj;
513 yaffs_Device *dev;
514
515 obj = yaffs_InodeToObject(inode);
516
517 T(YAFFS_TRACE_OS,
518 ("yaffs_clear_inode: ino %d, count %d %s\n", (int)inode->i_ino,
519 atomic_read(&inode->i_count),
520 obj ? "object exists" : "null object"));
521
522 if (obj) {
523 dev = obj->myDev;
524 yaffs_GrossLock(dev);
525
526 /* Clear the association between the inode and
527 * the yaffs_Object.
528 */
529 obj->myInode = NULL;
530 yaffs_InodeToObjectLV(inode) = NULL;
531
532 /* If the object freeing was deferred, then the real
533 * free happens now.
534 * This should fix the inode inconsistency problem.
535 */
536
537 yaffs_HandleDeferedFree(obj);
538
539 yaffs_GrossUnlock(dev);
540 }
541
542 }
543
544 /* delete is called when the link count is zero and the inode
545 * is put (ie. nobody wants to know about it anymore, time to
546 * delete the file).
547 * NB Must call clear_inode()
548 */
549 static void yaffs_delete_inode(struct inode *inode)
550 {
551 yaffs_Object *obj = yaffs_InodeToObject(inode);
552 yaffs_Device *dev;
553
554 T(YAFFS_TRACE_OS,
555 ("yaffs_delete_inode: ino %d, count %d %s\n", (int)inode->i_ino,
556 atomic_read(&inode->i_count),
557 obj ? "object exists" : "null object"));
558
559 if (obj) {
560 dev = obj->myDev;
561 yaffs_GrossLock(dev);
562 yaffs_DeleteObject(obj);
563 yaffs_GrossUnlock(dev);
564 }
565 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
566 truncate_inode_pages(&inode->i_data, 0);
567 #endif
568 clear_inode(inode);
569 }
570
571 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
572 static int yaffs_file_flush(struct file *file, fl_owner_t id)
573 #else
574 static int yaffs_file_flush(struct file *file)
575 #endif
576 {
577 yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry);
578
579 yaffs_Device *dev = obj->myDev;
580
581 T(YAFFS_TRACE_OS,
582 ("yaffs_file_flush object %d (%s)\n", obj->objectId,
583 obj->dirty ? "dirty" : "clean"));
584
585 yaffs_GrossLock(dev);
586
587 yaffs_FlushFile(obj, 1);
588
589 yaffs_GrossUnlock(dev);
590
591 return 0;
592 }
593
594 static int yaffs_readpage_nolock(struct file *f, struct page *pg)
595 {
596 /* Lifted from jffs2 */
597
598 yaffs_Object *obj;
599 unsigned char *pg_buf;
600 int ret;
601
602 yaffs_Device *dev;
603
604 T(YAFFS_TRACE_OS, ("yaffs_readpage at %08x, size %08x\n",
605 (unsigned)(pg->index << PAGE_CACHE_SHIFT),
606 (unsigned)PAGE_CACHE_SIZE));
607
608 obj = yaffs_DentryToObject(f->f_dentry);
609
610 dev = obj->myDev;
611
612 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
613 BUG_ON(!PageLocked(pg));
614 #else
615 if (!PageLocked(pg))
616 PAGE_BUG(pg);
617 #endif
618
619 pg_buf = kmap(pg);
620 /* FIXME: Can kmap fail? */
621
622 yaffs_GrossLock(dev);
623
624 ret = yaffs_ReadDataFromFile(obj, pg_buf,
625 pg->index << PAGE_CACHE_SHIFT,
626 PAGE_CACHE_SIZE);
627
628 yaffs_GrossUnlock(dev);
629
630 if (ret >= 0)
631 ret = 0;
632
633 if (ret) {
634 ClearPageUptodate(pg);
635 SetPageError(pg);
636 } else {
637 SetPageUptodate(pg);
638 ClearPageError(pg);
639 }
640
641 flush_dcache_page(pg);
642 kunmap(pg);
643
644 T(YAFFS_TRACE_OS, ("yaffs_readpage done\n"));
645 return ret;
646 }
647
648 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
649 {
650 int ret = yaffs_readpage_nolock(f, pg);
651 UnlockPage(pg);
652 return ret;
653 }
654
655 static int yaffs_readpage(struct file *f, struct page *pg)
656 {
657 return yaffs_readpage_unlock(f, pg);
658 }
659
660 /* writepage inspired by/stolen from smbfs */
661
662 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
663 static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
664 #else
665 static int yaffs_writepage(struct page *page)
666 #endif
667 {
668 struct address_space *mapping = page->mapping;
669 loff_t offset = (loff_t) page->index << PAGE_CACHE_SHIFT;
670 struct inode *inode;
671 unsigned long end_index;
672 char *buffer;
673 yaffs_Object *obj;
674 int nWritten = 0;
675 unsigned nBytes;
676
677 if (!mapping)
678 BUG();
679 inode = mapping->host;
680 if (!inode)
681 BUG();
682
683 if (offset > inode->i_size) {
684 T(YAFFS_TRACE_OS,
685 ("yaffs_writepage at %08x, inode size = %08x!!!\n",
686 (unsigned)(page->index << PAGE_CACHE_SHIFT),
687 (unsigned)inode->i_size));
688 T(YAFFS_TRACE_OS,
689 (" -> don't care!!\n"));
690 unlock_page(page);
691 return 0;
692 }
693
694 end_index = inode->i_size >> PAGE_CACHE_SHIFT;
695
696 /* easy case */
697 if (page->index < end_index)
698 nBytes = PAGE_CACHE_SIZE;
699 else
700 nBytes = inode->i_size & (PAGE_CACHE_SIZE - 1);
701
702 get_page(page);
703
704 buffer = kmap(page);
705
706 obj = yaffs_InodeToObject(inode);
707 yaffs_GrossLock(obj->myDev);
708
709 T(YAFFS_TRACE_OS,
710 ("yaffs_writepage at %08x, size %08x\n",
711 (unsigned)(page->index << PAGE_CACHE_SHIFT), nBytes));
712 T(YAFFS_TRACE_OS,
713 ("writepag0: obj = %05x, ino = %05x\n",
714 (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
715
716 nWritten = yaffs_WriteDataToFile(obj, buffer,
717 page->index << PAGE_CACHE_SHIFT, nBytes, 0);
718
719 T(YAFFS_TRACE_OS,
720 ("writepag1: obj = %05x, ino = %05x\n",
721 (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
722
723 yaffs_GrossUnlock(obj->myDev);
724
725 kunmap(page);
726 SetPageUptodate(page);
727 UnlockPage(page);
728 put_page(page);
729
730 return (nWritten == nBytes) ? 0 : -ENOSPC;
731 }
732
733
734 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
735 static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
736 loff_t pos, unsigned len, unsigned flags,
737 struct page **pagep, void **fsdata)
738 {
739 struct page *pg = NULL;
740 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
741 uint32_t offset = pos & (PAGE_CACHE_SIZE - 1);
742 uint32_t to = offset + len;
743
744 int ret = 0;
745 int space_held = 0;
746
747 T(YAFFS_TRACE_OS, ("start yaffs_write_begin\n"));
748 /* Get a page */
749 #if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 28)
750 pg = grab_cache_page_write_begin(mapping, index, flags);
751 #else
752 pg = __grab_cache_page(mapping, index);
753 #endif
754
755 *pagep = pg;
756 if (!pg) {
757 ret = -ENOMEM;
758 goto out;
759 }
760 /* Get fs space */
761 space_held = yaffs_hold_space(filp);
762
763 if (!space_held) {
764 ret = -ENOSPC;
765 goto out;
766 }
767
768 /* Update page if required */
769
770 if (!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
771 ret = yaffs_readpage_nolock(filp, pg);
772
773 if (ret)
774 goto out;
775
776 /* Happy path return */
777 T(YAFFS_TRACE_OS, ("end yaffs_write_begin - ok\n"));
778
779 return 0;
780
781 out:
782 T(YAFFS_TRACE_OS, ("end yaffs_write_begin fail returning %d\n", ret));
783 if (space_held)
784 yaffs_release_space(filp);
785 if (pg) {
786 unlock_page(pg);
787 page_cache_release(pg);
788 }
789 return ret;
790 }
791
792 #else
793
794 static int yaffs_prepare_write(struct file *f, struct page *pg,
795 unsigned offset, unsigned to)
796 {
797 T(YAFFS_TRACE_OS, ("yaffs_prepair_write\n"));
798
799 if (!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
800 return yaffs_readpage_nolock(f, pg);
801 return 0;
802 }
803 #endif
804
805 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
806 static int yaffs_write_end(struct file *filp, struct address_space *mapping,
807 loff_t pos, unsigned len, unsigned copied,
808 struct page *pg, void *fsdadata)
809 {
810 int ret = 0;
811 void *addr, *kva;
812 uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE - 1);
813
814 kva = kmap(pg);
815 addr = kva + offset_into_page;
816
817 T(YAFFS_TRACE_OS,
818 ("yaffs_write_end addr %x pos %x nBytes %d\n",
819 (unsigned) addr,
820 (int)pos, copied));
821
822 ret = yaffs_file_write(filp, addr, copied, &pos);
823
824 if (ret != copied) {
825 T(YAFFS_TRACE_OS,
826 ("yaffs_write_end not same size ret %d copied %d\n",
827 ret, copied));
828 SetPageError(pg);
829 ClearPageUptodate(pg);
830 } else {
831 SetPageUptodate(pg);
832 }
833
834 kunmap(pg);
835
836 yaffs_release_space(filp);
837 unlock_page(pg);
838 page_cache_release(pg);
839 return ret;
840 }
841 #else
842
843 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
844 unsigned to)
845 {
846 void *addr, *kva;
847
848 loff_t pos = (((loff_t) pg->index) << PAGE_CACHE_SHIFT) + offset;
849 int nBytes = to - offset;
850 int nWritten;
851
852 unsigned spos = pos;
853 unsigned saddr;
854
855 kva = kmap(pg);
856 addr = kva + offset;
857
858 saddr = (unsigned) addr;
859
860 T(YAFFS_TRACE_OS,
861 ("yaffs_commit_write addr %x pos %x nBytes %d\n",
862 saddr, spos, nBytes));
863
864 nWritten = yaffs_file_write(f, addr, nBytes, &pos);
865
866 if (nWritten != nBytes) {
867 T(YAFFS_TRACE_OS,
868 ("yaffs_commit_write not same size nWritten %d nBytes %d\n",
869 nWritten, nBytes));
870 SetPageError(pg);
871 ClearPageUptodate(pg);
872 } else {
873 SetPageUptodate(pg);
874 }
875
876 kunmap(pg);
877
878 T(YAFFS_TRACE_OS,
879 ("yaffs_commit_write returning %d\n",
880 nWritten == nBytes ? 0 : nWritten));
881
882 return nWritten == nBytes ? 0 : nWritten;
883 }
884 #endif
885
886
887 static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object *obj)
888 {
889 if (inode && obj) {
890
891
892 /* Check mode against the variant type and attempt to repair if broken. */
893 __u32 mode = obj->yst_mode;
894 switch (obj->variantType) {
895 case YAFFS_OBJECT_TYPE_FILE:
896 if (!S_ISREG(mode)) {
897 obj->yst_mode &= ~S_IFMT;
898 obj->yst_mode |= S_IFREG;
899 }
900
901 break;
902 case YAFFS_OBJECT_TYPE_SYMLINK:
903 if (!S_ISLNK(mode)) {
904 obj->yst_mode &= ~S_IFMT;
905 obj->yst_mode |= S_IFLNK;
906 }
907
908 break;
909 case YAFFS_OBJECT_TYPE_DIRECTORY:
910 if (!S_ISDIR(mode)) {
911 obj->yst_mode &= ~S_IFMT;
912 obj->yst_mode |= S_IFDIR;
913 }
914
915 break;
916 case YAFFS_OBJECT_TYPE_UNKNOWN:
917 case YAFFS_OBJECT_TYPE_HARDLINK:
918 case YAFFS_OBJECT_TYPE_SPECIAL:
919 default:
920 /* TODO? */
921 break;
922 }
923
924 inode->i_flags |= S_NOATIME;
925
926 inode->i_ino = obj->objectId;
927 inode->i_mode = obj->yst_mode;
928 inode->i_uid = obj->yst_uid;
929 inode->i_gid = obj->yst_gid;
930 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
931 inode->i_blksize = inode->i_sb->s_blocksize;
932 #endif
933 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
934
935 inode->i_rdev = old_decode_dev(obj->yst_rdev);
936 inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
937 inode->i_atime.tv_nsec = 0;
938 inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
939 inode->i_mtime.tv_nsec = 0;
940 inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
941 inode->i_ctime.tv_nsec = 0;
942 #else
943 inode->i_rdev = obj->yst_rdev;
944 inode->i_atime = obj->yst_atime;
945 inode->i_mtime = obj->yst_mtime;
946 inode->i_ctime = obj->yst_ctime;
947 #endif
948 inode->i_size = yaffs_GetObjectFileLength(obj);
949 inode->i_blocks = (inode->i_size + 511) >> 9;
950
951 inode->i_nlink = yaffs_GetObjectLinkCount(obj);
952
953 T(YAFFS_TRACE_OS,
954 ("yaffs_FillInode mode %x uid %d gid %d size %d count %d\n",
955 inode->i_mode, inode->i_uid, inode->i_gid,
956 (int)inode->i_size, atomic_read(&inode->i_count)));
957
958 switch (obj->yst_mode & S_IFMT) {
959 default: /* fifo, device or socket */
960 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
961 init_special_inode(inode, obj->yst_mode,
962 old_decode_dev(obj->yst_rdev));
963 #else
964 init_special_inode(inode, obj->yst_mode,
965 (dev_t) (obj->yst_rdev));
966 #endif
967 break;
968 case S_IFREG: /* file */
969 inode->i_op = &yaffs_file_inode_operations;
970 inode->i_fop = &yaffs_file_operations;
971 inode->i_mapping->a_ops =
972 &yaffs_file_address_operations;
973 break;
974 case S_IFDIR: /* directory */
975 inode->i_op = &yaffs_dir_inode_operations;
976 inode->i_fop = &yaffs_dir_operations;
977 break;
978 case S_IFLNK: /* symlink */
979 inode->i_op = &yaffs_symlink_inode_operations;
980 break;
981 }
982
983 yaffs_InodeToObjectLV(inode) = obj;
984
985 obj->myInode = inode;
986
987 } else {
988 T(YAFFS_TRACE_OS,
989 ("yaffs_FileInode invalid parameters\n"));
990 }
991
992 }
993
994 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
995 yaffs_Object *obj)
996 {
997 struct inode *inode;
998
999 if (!sb) {
1000 T(YAFFS_TRACE_OS,
1001 ("yaffs_get_inode for NULL super_block!!\n"));
1002 return NULL;
1003
1004 }
1005
1006 if (!obj) {
1007 T(YAFFS_TRACE_OS,
1008 ("yaffs_get_inode for NULL object!!\n"));
1009 return NULL;
1010
1011 }
1012
1013 T(YAFFS_TRACE_OS,
1014 ("yaffs_get_inode for object %d\n", obj->objectId));
1015
1016 inode = Y_IGET(sb, obj->objectId);
1017 if (IS_ERR(inode))
1018 return NULL;
1019
1020 /* NB Side effect: iget calls back to yaffs_read_inode(). */
1021 /* iget also increments the inode's i_count */
1022 /* NB You can't be holding grossLock or deadlock will happen! */
1023
1024 return inode;
1025 }
1026
1027 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
1028 loff_t *pos)
1029 {
1030 yaffs_Object *obj;
1031 int nWritten, ipos;
1032 struct inode *inode;
1033 yaffs_Device *dev;
1034
1035 obj = yaffs_DentryToObject(f->f_dentry);
1036
1037 dev = obj->myDev;
1038
1039 yaffs_GrossLock(dev);
1040
1041 inode = f->f_dentry->d_inode;
1042
1043 if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
1044 ipos = inode->i_size;
1045 else
1046 ipos = *pos;
1047
1048 if (!obj)
1049 T(YAFFS_TRACE_OS,
1050 ("yaffs_file_write: hey obj is null!\n"));
1051 else
1052 T(YAFFS_TRACE_OS,
1053 ("yaffs_file_write about to write writing %zu bytes"
1054 "to object %d at %d\n",
1055 n, obj->objectId, ipos));
1056
1057 nWritten = yaffs_WriteDataToFile(obj, buf, ipos, n, 0);
1058
1059 T(YAFFS_TRACE_OS,
1060 ("yaffs_file_write writing %zu bytes, %d written at %d\n",
1061 n, nWritten, ipos));
1062
1063 if (nWritten > 0) {
1064 ipos += nWritten;
1065 *pos = ipos;
1066 if (ipos > inode->i_size) {
1067 inode->i_size = ipos;
1068 inode->i_blocks = (ipos + 511) >> 9;
1069
1070 T(YAFFS_TRACE_OS,
1071 ("yaffs_file_write size updated to %d bytes, "
1072 "%d blocks\n",
1073 ipos, (int)(inode->i_blocks)));
1074 }
1075
1076 }
1077 yaffs_GrossUnlock(dev);
1078 return nWritten == 0 ? -ENOSPC : nWritten;
1079 }
1080
1081 /* Space holding and freeing is done to ensure we have space available for write_begin/end */
1082 /* For now we just assume few parallel writes and check against a small number. */
1083 /* Todo: need to do this with a counter to handle parallel reads better */
1084
1085 static ssize_t yaffs_hold_space(struct file *f)
1086 {
1087 yaffs_Object *obj;
1088 yaffs_Device *dev;
1089
1090 int nFreeChunks;
1091
1092
1093 obj = yaffs_DentryToObject(f->f_dentry);
1094
1095 dev = obj->myDev;
1096
1097 yaffs_GrossLock(dev);
1098
1099 nFreeChunks = yaffs_GetNumberOfFreeChunks(dev);
1100
1101 yaffs_GrossUnlock(dev);
1102
1103 return (nFreeChunks > 20) ? 1 : 0;
1104 }
1105
1106 static void yaffs_release_space(struct file *f)
1107 {
1108 yaffs_Object *obj;
1109 yaffs_Device *dev;
1110
1111
1112 obj = yaffs_DentryToObject(f->f_dentry);
1113
1114 dev = obj->myDev;
1115
1116 yaffs_GrossLock(dev);
1117
1118
1119 yaffs_GrossUnlock(dev);
1120 }
1121
1122 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
1123 {
1124 yaffs_Object *obj;
1125 yaffs_Device *dev;
1126 struct inode *inode = f->f_dentry->d_inode;
1127 unsigned long offset, curoffs;
1128 struct ylist_head *i;
1129 yaffs_Object *l;
1130
1131 char name[YAFFS_MAX_NAME_LENGTH + 1];
1132
1133 obj = yaffs_DentryToObject(f->f_dentry);
1134 dev = obj->myDev;
1135
1136 yaffs_GrossLock(dev);
1137
1138 offset = f->f_pos;
1139
1140 T(YAFFS_TRACE_OS, ("yaffs_readdir: starting at %d\n", (int)offset));
1141
1142 if (offset == 0) {
1143 T(YAFFS_TRACE_OS,
1144 ("yaffs_readdir: entry . ino %d \n",
1145 (int)inode->i_ino));
1146 if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0)
1147 goto out;
1148 offset++;
1149 f->f_pos++;
1150 }
1151 if (offset == 1) {
1152 T(YAFFS_TRACE_OS,
1153 ("yaffs_readdir: entry .. ino %d \n",
1154 (int)f->f_dentry->d_parent->d_inode->i_ino));
1155 if (filldir(dirent, "..", 2, offset,
1156 f->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0)
1157 goto out;
1158 offset++;
1159 f->f_pos++;
1160 }
1161
1162 curoffs = 1;
1163
1164 /* If the directory has changed since the open or last call to
1165 readdir, rewind to after the 2 canned entries. */
1166
1167 if (f->f_version != inode->i_version) {
1168 offset = 2;
1169 f->f_pos = offset;
1170 f->f_version = inode->i_version;
1171 }
1172
1173 ylist_for_each(i, &obj->variant.directoryVariant.children) {
1174 curoffs++;
1175 if (curoffs >= offset) {
1176 l = ylist_entry(i, yaffs_Object, siblings);
1177
1178 yaffs_GetObjectName(l, name,
1179 YAFFS_MAX_NAME_LENGTH + 1);
1180 T(YAFFS_TRACE_OS,
1181 ("yaffs_readdir: %s inode %d\n", name,
1182 yaffs_GetObjectInode(l)));
1183
1184 if (filldir(dirent,
1185 name,
1186 strlen(name),
1187 offset,
1188 yaffs_GetObjectInode(l),
1189 yaffs_GetObjectType(l)) < 0)
1190 goto up_and_out;
1191
1192 offset++;
1193 f->f_pos++;
1194 }
1195 }
1196
1197 up_and_out:
1198 out:
1199 yaffs_GrossUnlock(dev);
1200
1201 return 0;
1202 }
1203
1204 /*
1205 * File creation. Allocate an inode, and we're done..
1206 */
1207
1208 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
1209 #define YCRED(x) x
1210 #else
1211 #define YCRED(x) (x->cred)
1212 #endif
1213
1214 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1215 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1216 dev_t rdev)
1217 #else
1218 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1219 int rdev)
1220 #endif
1221 {
1222 struct inode *inode;
1223
1224 yaffs_Object *obj = NULL;
1225 yaffs_Device *dev;
1226
1227 yaffs_Object *parent = yaffs_InodeToObject(dir);
1228
1229 int error = -ENOSPC;
1230 uid_t uid = YCRED(current)->fsuid;
1231 gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
1232
1233 if ((dir->i_mode & S_ISGID) && S_ISDIR(mode))
1234 mode |= S_ISGID;
1235
1236 if (parent) {
1237 T(YAFFS_TRACE_OS,
1238 ("yaffs_mknod: parent object %d type %d\n",
1239 parent->objectId, parent->variantType));
1240 } else {
1241 T(YAFFS_TRACE_OS,
1242 ("yaffs_mknod: could not get parent object\n"));
1243 return -EPERM;
1244 }
1245
1246 T(YAFFS_TRACE_OS, ("yaffs_mknod: making oject for %s, "
1247 "mode %x dev %x\n",
1248 dentry->d_name.name, mode, rdev));
1249
1250 dev = parent->myDev;
1251
1252 yaffs_GrossLock(dev);
1253
1254 switch (mode & S_IFMT) {
1255 default:
1256 /* Special (socket, fifo, device...) */
1257 T(YAFFS_TRACE_OS, ("yaffs_mknod: making special\n"));
1258 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1259 obj = yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
1260 gid, old_encode_dev(rdev));
1261 #else
1262 obj = yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
1263 gid, rdev);
1264 #endif
1265 break;
1266 case S_IFREG: /* file */
1267 T(YAFFS_TRACE_OS, ("yaffs_mknod: making file\n"));
1268 obj = yaffs_MknodFile(parent, dentry->d_name.name, mode, uid,
1269 gid);
1270 break;
1271 case S_IFDIR: /* directory */
1272 T(YAFFS_TRACE_OS,
1273 ("yaffs_mknod: making directory\n"));
1274 obj = yaffs_MknodDirectory(parent, dentry->d_name.name, mode,
1275 uid, gid);
1276 break;
1277 case S_IFLNK: /* symlink */
1278 T(YAFFS_TRACE_OS, ("yaffs_mknod: making symlink\n"));
1279 obj = NULL; /* Do we ever get here? */
1280 break;
1281 }
1282
1283 /* Can not call yaffs_get_inode() with gross lock held */
1284 yaffs_GrossUnlock(dev);
1285
1286 if (obj) {
1287 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
1288 d_instantiate(dentry, inode);
1289 T(YAFFS_TRACE_OS,
1290 ("yaffs_mknod created object %d count = %d\n",
1291 obj->objectId, atomic_read(&inode->i_count)));
1292 error = 0;
1293 } else {
1294 T(YAFFS_TRACE_OS,
1295 ("yaffs_mknod failed making object\n"));
1296 error = -ENOMEM;
1297 }
1298
1299 return error;
1300 }
1301
1302 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1303 {
1304 int retVal;
1305 T(YAFFS_TRACE_OS, ("yaffs_mkdir\n"));
1306 retVal = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
1307 return retVal;
1308 }
1309
1310 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1311 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
1312 struct nameidata *n)
1313 #else
1314 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
1315 #endif
1316 {
1317 T(YAFFS_TRACE_OS, ("yaffs_create\n"));
1318 return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
1319 }
1320
1321 static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
1322 {
1323 int retVal;
1324
1325 yaffs_Device *dev;
1326
1327 T(YAFFS_TRACE_OS,
1328 ("yaffs_unlink %d:%s\n", (int)(dir->i_ino),
1329 dentry->d_name.name));
1330
1331 dev = yaffs_InodeToObject(dir)->myDev;
1332
1333 yaffs_GrossLock(dev);
1334
1335 retVal = yaffs_Unlink(yaffs_InodeToObject(dir), dentry->d_name.name);
1336
1337 if (retVal == YAFFS_OK) {
1338 dentry->d_inode->i_nlink--;
1339 dir->i_version++;
1340 yaffs_GrossUnlock(dev);
1341 mark_inode_dirty(dentry->d_inode);
1342 return 0;
1343 }
1344 yaffs_GrossUnlock(dev);
1345 return -ENOTEMPTY;
1346 }
1347
1348 /*
1349 * Create a link...
1350 */
1351 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
1352 struct dentry *dentry)
1353 {
1354 struct inode *inode = old_dentry->d_inode;
1355 yaffs_Object *obj = NULL;
1356 yaffs_Object *link = NULL;
1357 yaffs_Device *dev;
1358
1359 T(YAFFS_TRACE_OS, ("yaffs_link\n"));
1360
1361 obj = yaffs_InodeToObject(inode);
1362 dev = obj->myDev;
1363
1364 yaffs_GrossLock(dev);
1365
1366 if (!S_ISDIR(inode->i_mode)) /* Don't link directories */
1367 link = yaffs_Link(yaffs_InodeToObject(dir), dentry->d_name.name,
1368 obj);
1369
1370 if (link) {
1371 old_dentry->d_inode->i_nlink = yaffs_GetObjectLinkCount(obj);
1372 d_instantiate(dentry, old_dentry->d_inode);
1373 atomic_inc(&old_dentry->d_inode->i_count);
1374 T(YAFFS_TRACE_OS,
1375 ("yaffs_link link count %d i_count %d\n",
1376 old_dentry->d_inode->i_nlink,
1377 atomic_read(&old_dentry->d_inode->i_count)));
1378 }
1379
1380 yaffs_GrossUnlock(dev);
1381
1382 if (link)
1383 return 0;
1384
1385 return -EPERM;
1386 }
1387
1388 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
1389 const char *symname)
1390 {
1391 yaffs_Object *obj;
1392 yaffs_Device *dev;
1393 uid_t uid = YCRED(current)->fsuid;
1394 gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
1395
1396 T(YAFFS_TRACE_OS, ("yaffs_symlink\n"));
1397
1398 dev = yaffs_InodeToObject(dir)->myDev;
1399 yaffs_GrossLock(dev);
1400 obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name,
1401 S_IFLNK | S_IRWXUGO, uid, gid, symname);
1402 yaffs_GrossUnlock(dev);
1403
1404 if (obj) {
1405 struct inode *inode;
1406
1407 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
1408 d_instantiate(dentry, inode);
1409 T(YAFFS_TRACE_OS, ("symlink created OK\n"));
1410 return 0;
1411 } else {
1412 T(YAFFS_TRACE_OS, ("symlink not created\n"));
1413 }
1414
1415 return -ENOMEM;
1416 }
1417
1418 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
1419 int datasync)
1420 {
1421
1422 yaffs_Object *obj;
1423 yaffs_Device *dev;
1424
1425 obj = yaffs_DentryToObject(dentry);
1426
1427 dev = obj->myDev;
1428
1429 T(YAFFS_TRACE_OS, ("yaffs_sync_object\n"));
1430 yaffs_GrossLock(dev);
1431 yaffs_FlushFile(obj, 1);
1432 yaffs_GrossUnlock(dev);
1433 return 0;
1434 }
1435
1436 /*
1437 * The VFS layer already does all the dentry stuff for rename.
1438 *
1439 * NB: POSIX says you can rename an object over an old object of the same name
1440 */
1441 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
1442 struct inode *new_dir, struct dentry *new_dentry)
1443 {
1444 yaffs_Device *dev;
1445 int retVal = YAFFS_FAIL;
1446 yaffs_Object *target;
1447
1448 T(YAFFS_TRACE_OS, ("yaffs_rename\n"));
1449 dev = yaffs_InodeToObject(old_dir)->myDev;
1450
1451 yaffs_GrossLock(dev);
1452
1453 /* Check if the target is an existing directory that is not empty. */
1454 target = yaffs_FindObjectByName(yaffs_InodeToObject(new_dir),
1455 new_dentry->d_name.name);
1456
1457
1458
1459 if (target && target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
1460 !ylist_empty(&target->variant.directoryVariant.children)) {
1461
1462 T(YAFFS_TRACE_OS, ("target is non-empty dir\n"));
1463
1464 retVal = YAFFS_FAIL;
1465 } else {
1466 /* Now does unlinking internally using shadowing mechanism */
1467 T(YAFFS_TRACE_OS, ("calling yaffs_RenameObject\n"));
1468
1469 retVal = yaffs_RenameObject(yaffs_InodeToObject(old_dir),
1470 old_dentry->d_name.name,
1471 yaffs_InodeToObject(new_dir),
1472 new_dentry->d_name.name);
1473 }
1474 yaffs_GrossUnlock(dev);
1475
1476 if (retVal == YAFFS_OK) {
1477 if (target) {
1478 new_dentry->d_inode->i_nlink--;
1479 mark_inode_dirty(new_dentry->d_inode);
1480 }
1481
1482 return 0;
1483 } else {
1484 return -ENOTEMPTY;
1485 }
1486 }
1487
1488 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
1489 {
1490 struct inode *inode = dentry->d_inode;
1491 int error;
1492 yaffs_Device *dev;
1493
1494 T(YAFFS_TRACE_OS,
1495 ("yaffs_setattr of object %d\n",
1496 yaffs_InodeToObject(inode)->objectId));
1497
1498 error = inode_change_ok(inode, attr);
1499 if (error == 0) {
1500 dev = yaffs_InodeToObject(inode)->myDev;
1501 yaffs_GrossLock(dev);
1502 if (yaffs_SetAttributes(yaffs_InodeToObject(inode), attr) ==
1503 YAFFS_OK) {
1504 error = 0;
1505 } else {
1506 error = -EPERM;
1507 }
1508 yaffs_GrossUnlock(dev);
1509 if (!error)
1510 error = inode_setattr(inode, attr);
1511 }
1512 return error;
1513 }
1514
1515 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
1516 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
1517 {
1518 yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
1519 struct super_block *sb = dentry->d_sb;
1520 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1521 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
1522 {
1523 yaffs_Device *dev = yaffs_SuperToDevice(sb);
1524 #else
1525 static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
1526 {
1527 yaffs_Device *dev = yaffs_SuperToDevice(sb);
1528 #endif
1529
1530 T(YAFFS_TRACE_OS, ("yaffs_statfs\n"));
1531
1532 yaffs_GrossLock(dev);
1533
1534 buf->f_type = YAFFS_MAGIC;
1535 buf->f_bsize = sb->s_blocksize;
1536 buf->f_namelen = 255;
1537
1538 if (dev->nDataBytesPerChunk & (dev->nDataBytesPerChunk - 1)) {
1539 /* Do this if chunk size is not a power of 2 */
1540
1541 uint64_t bytesInDev;
1542 uint64_t bytesFree;
1543
1544 bytesInDev = ((uint64_t)((dev->endBlock - dev->startBlock + 1))) *
1545 ((uint64_t)(dev->nChunksPerBlock * dev->nDataBytesPerChunk));
1546
1547 do_div(bytesInDev, sb->s_blocksize); /* bytesInDev becomes the number of blocks */
1548 buf->f_blocks = bytesInDev;
1549
1550 bytesFree = ((uint64_t)(yaffs_GetNumberOfFreeChunks(dev))) *
1551 ((uint64_t)(dev->nDataBytesPerChunk));
1552
1553 do_div(bytesFree, sb->s_blocksize);
1554
1555 buf->f_bfree = bytesFree;
1556
1557 } else if (sb->s_blocksize > dev->nDataBytesPerChunk) {
1558
1559 buf->f_blocks =
1560 (dev->endBlock - dev->startBlock + 1) *
1561 dev->nChunksPerBlock /
1562 (sb->s_blocksize / dev->nDataBytesPerChunk);
1563 buf->f_bfree =
1564 yaffs_GetNumberOfFreeChunks(dev) /
1565 (sb->s_blocksize / dev->nDataBytesPerChunk);
1566 } else {
1567 buf->f_blocks =
1568 (dev->endBlock - dev->startBlock + 1) *
1569 dev->nChunksPerBlock *
1570 (dev->nDataBytesPerChunk / sb->s_blocksize);
1571
1572 buf->f_bfree =
1573 yaffs_GetNumberOfFreeChunks(dev) *
1574 (dev->nDataBytesPerChunk / sb->s_blocksize);
1575 }
1576
1577 buf->f_files = 0;
1578 buf->f_ffree = 0;
1579 buf->f_bavail = buf->f_bfree;
1580
1581 yaffs_GrossUnlock(dev);
1582 return 0;
1583 }
1584
1585
1586 static int yaffs_do_sync_fs(struct super_block *sb)
1587 {
1588
1589 yaffs_Device *dev = yaffs_SuperToDevice(sb);
1590 T(YAFFS_TRACE_OS, ("yaffs_do_sync_fs\n"));
1591
1592 if (sb->s_dirt) {
1593 yaffs_GrossLock(dev);
1594
1595 if (dev) {
1596 yaffs_FlushEntireDeviceCache(dev);
1597 yaffs_CheckpointSave(dev);
1598 }
1599
1600 yaffs_GrossUnlock(dev);
1601
1602 sb->s_dirt = 0;
1603 }
1604 return 0;
1605 }
1606
1607
1608 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
1609 static void yaffs_write_super(struct super_block *sb)
1610 #else
1611 static int yaffs_write_super(struct super_block *sb)
1612 #endif
1613 {
1614
1615 T(YAFFS_TRACE_OS, ("yaffs_write_super\n"));
1616 if (yaffs_auto_checkpoint >= 2)
1617 yaffs_do_sync_fs(sb);
1618 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 18))
1619 return 0;
1620 #endif
1621 }
1622
1623
1624 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
1625 static int yaffs_sync_fs(struct super_block *sb, int wait)
1626 #else
1627 static int yaffs_sync_fs(struct super_block *sb)
1628 #endif
1629 {
1630 T(YAFFS_TRACE_OS, ("yaffs_sync_fs\n"));
1631
1632 if (yaffs_auto_checkpoint >= 1)
1633 yaffs_do_sync_fs(sb);
1634
1635 return 0;
1636 }
1637
1638 #ifdef YAFFS_USE_OWN_IGET
1639
1640 static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino)
1641 {
1642 struct inode *inode;
1643 yaffs_Object *obj;
1644 yaffs_Device *dev = yaffs_SuperToDevice(sb);
1645
1646 T(YAFFS_TRACE_OS,
1647 ("yaffs_iget for %lu\n", ino));
1648
1649 inode = iget_locked(sb, ino);
1650 if (!inode)
1651 return ERR_PTR(-ENOMEM);
1652 if (!(inode->i_state & I_NEW))
1653 return inode;
1654
1655 /* NB This is called as a side effect of other functions, but
1656 * we had to release the lock to prevent deadlocks, so
1657 * need to lock again.
1658 */
1659
1660 yaffs_GrossLock(dev);
1661
1662 obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
1663
1664 yaffs_FillInodeFromObject(inode, obj);
1665
1666 yaffs_GrossUnlock(dev);
1667
1668 unlock_new_inode(inode);
1669 return inode;
1670 }
1671
1672 #else
1673
1674 static void yaffs_read_inode(struct inode *inode)
1675 {
1676 /* NB This is called as a side effect of other functions, but
1677 * we had to release the lock to prevent deadlocks, so
1678 * need to lock again.
1679 */
1680
1681 yaffs_Object *obj;
1682 yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
1683
1684 T(YAFFS_TRACE_OS,
1685 ("yaffs_read_inode for %d\n", (int)inode->i_ino));
1686
1687 yaffs_GrossLock(dev);
1688
1689 obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
1690
1691 yaffs_FillInodeFromObject(inode, obj);
1692
1693 yaffs_GrossUnlock(dev);
1694 }
1695
1696 #endif
1697
1698 static YLIST_HEAD(yaffs_dev_list);
1699
1700 #if 0 /* not used */
1701 static int yaffs_remount_fs(struct super_block *sb, int *flags, char *data)
1702 {
1703 yaffs_Device *dev = yaffs_SuperToDevice(sb);
1704
1705 if (*flags & MS_RDONLY) {
1706 struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1707
1708 T(YAFFS_TRACE_OS,
1709 ("yaffs_remount_fs: %s: RO\n", dev->name));
1710
1711 yaffs_GrossLock(dev);
1712
1713 yaffs_FlushEntireDeviceCache(dev);
1714
1715 yaffs_CheckpointSave(dev);
1716
1717 if (mtd->sync)
1718 mtd->sync(mtd);
1719
1720 yaffs_GrossUnlock(dev);
1721 } else {
1722 T(YAFFS_TRACE_OS,
1723 ("yaffs_remount_fs: %s: RW\n", dev->name));
1724 }
1725
1726 return 0;
1727 }
1728 #endif
1729
1730 static void yaffs_put_super(struct super_block *sb)
1731 {
1732 yaffs_Device *dev = yaffs_SuperToDevice(sb);
1733
1734 T(YAFFS_TRACE_OS, ("yaffs_put_super\n"));
1735
1736 yaffs_GrossLock(dev);
1737
1738 yaffs_FlushEntireDeviceCache(dev);
1739
1740 yaffs_CheckpointSave(dev);
1741
1742 if (dev->putSuperFunc)
1743 dev->putSuperFunc(sb);
1744
1745 yaffs_Deinitialise(dev);
1746
1747 yaffs_GrossUnlock(dev);
1748
1749 /* we assume this is protected by lock_kernel() in mount/umount */
1750 ylist_del(&dev->devList);
1751
1752 if (dev->spareBuffer) {
1753 YFREE(dev->spareBuffer);
1754 dev->spareBuffer = NULL;
1755 }
1756
1757 kfree(dev);
1758 }
1759
1760
1761 static void yaffs_MTDPutSuper(struct super_block *sb)
1762 {
1763 struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1764
1765 if (mtd->sync)
1766 mtd->sync(mtd);
1767
1768 put_mtd_device(mtd);
1769 }
1770
1771
1772 static void yaffs_MarkSuperBlockDirty(void *vsb)
1773 {
1774 struct super_block *sb = (struct super_block *)vsb;
1775
1776 T(YAFFS_TRACE_OS, ("yaffs_MarkSuperBlockDirty() sb = %p\n", sb));
1777 if (sb)
1778 sb->s_dirt = 1;
1779 }
1780
1781 typedef struct {
1782 int inband_tags;
1783 int skip_checkpoint_read;
1784 int skip_checkpoint_write;
1785 int no_cache;
1786 } yaffs_options;
1787
1788 #define MAX_OPT_LEN 20
1789 static int yaffs_parse_options(yaffs_options *options, const char *options_str)
1790 {
1791 char cur_opt[MAX_OPT_LEN + 1];
1792 int p;
1793 int error = 0;
1794
1795 /* Parse through the options which is a comma seperated list */
1796
1797 while (options_str && *options_str && !error) {
1798 memset(cur_opt, 0, MAX_OPT_LEN + 1);
1799 p = 0;
1800
1801 while (*options_str && *options_str != ',') {
1802 if (p < MAX_OPT_LEN) {
1803 cur_opt[p] = *options_str;
1804 p++;
1805 }
1806 options_str++;
1807 }
1808
1809 if (!strcmp(cur_opt, "inband-tags"))
1810 options->inband_tags = 1;
1811 else if (!strcmp(cur_opt, "no-cache"))
1812 options->no_cache = 1;
1813 else if (!strcmp(cur_opt, "no-checkpoint-read"))
1814 options->skip_checkpoint_read = 1;
1815 else if (!strcmp(cur_opt, "no-checkpoint-write"))
1816 options->skip_checkpoint_write = 1;
1817 else if (!strcmp(cur_opt, "no-checkpoint")) {
1818 options->skip_checkpoint_read = 1;
1819 options->skip_checkpoint_write = 1;
1820 } else {
1821 printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n",
1822 cur_opt);
1823 error = 1;
1824 }
1825 }
1826
1827 return error;
1828 }
1829
1830 static struct super_block *yaffs_internal_read_super(int yaffsVersion,
1831 struct super_block *sb,
1832 void *data, int silent)
1833 {
1834 int nBlocks;
1835 struct inode *inode = NULL;
1836 struct dentry *root;
1837 yaffs_Device *dev = 0;
1838 char devname_buf[BDEVNAME_SIZE + 1];
1839 struct mtd_info *mtd;
1840 int err;
1841 char *data_str = (char *)data;
1842
1843 yaffs_options options;
1844
1845 sb->s_magic = YAFFS_MAGIC;
1846 sb->s_op = &yaffs_super_ops;
1847 sb->s_flags |= MS_NOATIME;
1848
1849 if (!sb)
1850 printk(KERN_INFO "yaffs: sb is NULL\n");
1851 else if (!sb->s_dev)
1852 printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
1853 else if (!yaffs_devname(sb, devname_buf))
1854 printk(KERN_INFO "yaffs: devname is NULL\n");
1855 else
1856 printk(KERN_INFO "yaffs: dev is %d name is \"%s\"\n",
1857 sb->s_dev,
1858 yaffs_devname(sb, devname_buf));
1859
1860 if (!data_str)
1861 data_str = "";
1862
1863 printk(KERN_INFO "yaffs: passed flags \"%s\"\n", data_str);
1864
1865 memset(&options, 0, sizeof(options));
1866
1867 if (yaffs_parse_options(&options, data_str)) {
1868 /* Option parsing failed */
1869 return NULL;
1870 }
1871
1872
1873 sb->s_blocksize = PAGE_CACHE_SIZE;
1874 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1875 T(YAFFS_TRACE_OS, ("yaffs_read_super: Using yaffs%d\n", yaffsVersion));
1876 T(YAFFS_TRACE_OS,
1877 ("yaffs_read_super: block size %d\n", (int)(sb->s_blocksize)));
1878
1879 #ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
1880 T(YAFFS_TRACE_OS,
1881 ("yaffs: Write verification disabled. All guarantees "
1882 "null and void\n"));
1883 #endif
1884
1885 T(YAFFS_TRACE_ALWAYS, ("yaffs: Attempting MTD mount on %u.%u, "
1886 "\"%s\"\n",
1887 MAJOR(sb->s_dev), MINOR(sb->s_dev),
1888 yaffs_devname(sb, devname_buf)));
1889
1890 /* Check it's an mtd device..... */
1891 if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
1892 return NULL; /* This isn't an mtd device */
1893
1894 /* Get the device */
1895 mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
1896 if (!mtd) {
1897 T(YAFFS_TRACE_ALWAYS,
1898 ("yaffs: MTD device #%u doesn't appear to exist\n",
1899 MINOR(sb->s_dev)));
1900 return NULL;
1901 }
1902 /* Check it's NAND */
1903 if (mtd->type != MTD_NANDFLASH) {
1904 T(YAFFS_TRACE_ALWAYS,
1905 ("yaffs: MTD device is not NAND it's type %d\n", mtd->type));
1906 return NULL;
1907 }
1908
1909 T(YAFFS_TRACE_OS, (" erase %p\n", mtd->erase));
1910 T(YAFFS_TRACE_OS, (" read %p\n", mtd->read));
1911 T(YAFFS_TRACE_OS, (" write %p\n", mtd->write));
1912 T(YAFFS_TRACE_OS, (" readoob %p\n", mtd->read_oob));
1913 T(YAFFS_TRACE_OS, (" writeoob %p\n", mtd->write_oob));
1914 T(YAFFS_TRACE_OS, (" block_isbad %p\n", mtd->block_isbad));
1915 T(YAFFS_TRACE_OS, (" block_markbad %p\n", mtd->block_markbad));
1916 T(YAFFS_TRACE_OS, (" %s %d\n", WRITE_SIZE_STR, WRITE_SIZE(mtd)));
1917 T(YAFFS_TRACE_OS, (" oobsize %d\n", mtd->oobsize));
1918 T(YAFFS_TRACE_OS, (" erasesize %d\n", mtd->erasesize));
1919 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
1920 T(YAFFS_TRACE_OS, (" size %u\n", mtd->size));
1921 #else
1922 T(YAFFS_TRACE_OS, (" size %lld\n", mtd->size));
1923 #endif
1924
1925 #ifdef CONFIG_YAFFS_AUTO_YAFFS2
1926
1927 if (yaffsVersion == 1 && WRITE_SIZE(mtd) >= 2048) {
1928 T(YAFFS_TRACE_ALWAYS, ("yaffs: auto selecting yaffs2\n"));
1929 yaffsVersion = 2;
1930 }
1931
1932 /* Added NCB 26/5/2006 for completeness */
1933 if (yaffsVersion == 2 && !options.inband_tags && WRITE_SIZE(mtd) == 512) {
1934 T(YAFFS_TRACE_ALWAYS, ("yaffs: auto selecting yaffs1\n"));
1935 yaffsVersion = 1;
1936 }
1937
1938 #endif
1939
1940 if (yaffsVersion == 2) {
1941 /* Check for version 2 style functions */
1942 if (!mtd->erase ||
1943 !mtd->block_isbad ||
1944 !mtd->block_markbad ||
1945 !mtd->read ||
1946 !mtd->write ||
1947 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
1948 !mtd->read_oob || !mtd->write_oob) {
1949 #else
1950 !mtd->write_ecc ||
1951 !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
1952 #endif
1953 T(YAFFS_TRACE_ALWAYS,
1954 ("yaffs: MTD device does not support required "
1955 "functions\n"));;
1956 return NULL;
1957 }
1958
1959 if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
1960 mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) &&
1961 !options.inband_tags) {
1962 T(YAFFS_TRACE_ALWAYS,
1963 ("yaffs: MTD device does not have the "
1964 "right page sizes\n"));
1965 return NULL;
1966 }
1967 } else {
1968 /* Check for V1 style functions */
1969 if (!mtd->erase ||
1970 !mtd->read ||
1971 !mtd->write ||
1972 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
1973 !mtd->read_oob || !mtd->write_oob) {
1974 #else
1975 !mtd->write_ecc ||
1976 !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
1977 #endif
1978 T(YAFFS_TRACE_ALWAYS,
1979 ("yaffs: MTD device does not support required "
1980 "functions\n"));;
1981 return NULL;
1982 }
1983
1984 if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK ||
1985 mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
1986 T(YAFFS_TRACE_ALWAYS,
1987 ("yaffs: MTD device does not support have the "
1988 "right page sizes\n"));
1989 return NULL;
1990 }
1991 }
1992
1993 /* OK, so if we got here, we have an MTD that's NAND and looks
1994 * like it has the right capabilities
1995 * Set the yaffs_Device up for mtd
1996 */
1997
1998 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1999 sb->s_fs_info = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
2000 #else
2001 sb->u.generic_sbp = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
2002 #endif
2003 if (!dev) {
2004 /* Deep shit could not allocate device structure */
2005 T(YAFFS_TRACE_ALWAYS,
2006 ("yaffs_read_super: Failed trying to allocate "
2007 "yaffs_Device. \n"));
2008 return NULL;
2009 }
2010
2011 memset(dev, 0, sizeof(yaffs_Device));
2012 dev->genericDevice = mtd;
2013 dev->name = mtd->name;
2014
2015 /* Set up the memory size parameters.... */
2016
2017 nBlocks = YCALCBLOCKS(mtd->size, (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK));
2018
2019 dev->startBlock = 0;
2020 dev->endBlock = nBlocks - 1;
2021 dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
2022 dev->totalBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
2023 dev->nReservedBlocks = 5;
2024 dev->nShortOpCaches = (options.no_cache) ? 0 : 10;
2025 dev->inbandTags = options.inband_tags;
2026
2027 /* ... and the functions. */
2028 if (yaffsVersion == 2) {
2029 dev->writeChunkWithTagsToNAND =
2030 nandmtd2_WriteChunkWithTagsToNAND;
2031 dev->readChunkWithTagsFromNAND =
2032 nandmtd2_ReadChunkWithTagsFromNAND;
2033 dev->markNANDBlockBad = nandmtd2_MarkNANDBlockBad;
2034 dev->queryNANDBlock = nandmtd2_QueryNANDBlock;
2035 dev->spareBuffer = YMALLOC(mtd->oobsize);
2036 dev->isYaffs2 = 1;
2037 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2038 dev->totalBytesPerChunk = mtd->writesize;
2039 dev->nChunksPerBlock = mtd->erasesize / mtd->writesize;
2040 #else
2041 dev->totalBytesPerChunk = mtd->oobblock;
2042 dev->nChunksPerBlock = mtd->erasesize / mtd->oobblock;
2043 #endif
2044 nBlocks = YCALCBLOCKS(mtd->size, mtd->erasesize);
2045
2046 dev->startBlock = 0;
2047 dev->endBlock = nBlocks - 1;
2048 } else {
2049 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2050 /* use the MTD interface in yaffs_mtdif1.c */
2051 dev->writeChunkWithTagsToNAND =
2052 nandmtd1_WriteChunkWithTagsToNAND;
2053 dev->readChunkWithTagsFromNAND =
2054 nandmtd1_ReadChunkWithTagsFromNAND;
2055 dev->markNANDBlockBad = nandmtd1_MarkNANDBlockBad;
2056 dev->queryNANDBlock = nandmtd1_QueryNANDBlock;
2057 #else
2058 dev->writeChunkToNAND = nandmtd_WriteChunkToNAND;
2059 dev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
2060 #endif
2061 dev->isYaffs2 = 0;
2062 }
2063 /* ... and common functions */
2064 dev->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
2065 dev->initialiseNAND = nandmtd_InitialiseNAND;
2066
2067 dev->putSuperFunc = yaffs_MTDPutSuper;
2068
2069 dev->superBlock = (void *)sb;
2070 dev->markSuperBlockDirty = yaffs_MarkSuperBlockDirty;
2071
2072
2073 #ifndef CONFIG_YAFFS_DOES_ECC
2074 dev->useNANDECC = 1;
2075 #endif
2076
2077 #ifdef CONFIG_YAFFS_DISABLE_WIDE_TNODES
2078 dev->wideTnodesDisabled = 1;
2079 #endif
2080
2081 dev->skipCheckpointRead = options.skip_checkpoint_read;
2082 dev->skipCheckpointWrite = options.skip_checkpoint_write;
2083
2084 /* we assume this is protected by lock_kernel() in mount/umount */
2085 ylist_add_tail(&dev->devList, &yaffs_dev_list);
2086
2087 init_MUTEX(&dev->grossLock);
2088
2089 yaffs_GrossLock(dev);
2090
2091 err = yaffs_GutsInitialise(dev);
2092
2093 T(YAFFS_TRACE_OS,
2094 ("yaffs_read_super: guts initialised %s\n",
2095 (err == YAFFS_OK) ? "OK" : "FAILED"));
2096
2097 /* Release lock before yaffs_get_inode() */
2098 yaffs_GrossUnlock(dev);
2099
2100 /* Create root inode */
2101 if (err == YAFFS_OK)
2102 inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,
2103 yaffs_Root(dev));
2104
2105 if (!inode)
2106 return NULL;
2107
2108 inode->i_op = &yaffs_dir_inode_operations;
2109 inode->i_fop = &yaffs_dir_operations;
2110
2111 T(YAFFS_TRACE_OS, ("yaffs_read_super: got root inode\n"));
2112
2113 root = d_alloc_root(inode);
2114
2115 T(YAFFS_TRACE_OS, ("yaffs_read_super: d_alloc_root done\n"));
2116
2117 if (!root) {
2118 iput(inode);
2119 return NULL;
2120 }
2121 sb->s_root = root;
2122 sb->s_dirt = !dev->isCheckpointed;
2123 T(YAFFS_TRACE_ALWAYS,
2124 ("yaffs_read_super: isCheckpointed %d\n", dev->isCheckpointed));
2125
2126 T(YAFFS_TRACE_OS, ("yaffs_read_super: done\n"));
2127 return sb;
2128 }
2129
2130
2131 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2132 static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
2133 int silent)
2134 {
2135 return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
2136 }
2137
2138 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2139 static int yaffs_read_super(struct file_system_type *fs,
2140 int flags, const char *dev_name,
2141 void *data, struct vfsmount *mnt)
2142 {
2143
2144 return get_sb_bdev(fs, flags, dev_name, data,
2145 yaffs_internal_read_super_mtd, mnt);
2146 }
2147 #else
2148 static struct super_block *yaffs_read_super(struct file_system_type *fs,
2149 int flags, const char *dev_name,
2150 void *data)
2151 {
2152
2153 return get_sb_bdev(fs, flags, dev_name, data,
2154 yaffs_internal_read_super_mtd);
2155 }
2156 #endif
2157
2158 static struct file_system_type yaffs_fs_type = {
2159 .owner = THIS_MODULE,
2160 .name = "yaffs",
2161 .get_sb = yaffs_read_super,
2162 .kill_sb = kill_block_super,
2163 .fs_flags = FS_REQUIRES_DEV,
2164 };
2165 #else
2166 static struct super_block *yaffs_read_super(struct super_block *sb, void *data,
2167 int silent)
2168 {
2169 return yaffs_internal_read_super(1, sb, data, silent);
2170 }
2171
2172 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super,
2173 FS_REQUIRES_DEV);
2174 #endif
2175
2176
2177 #ifdef CONFIG_YAFFS_YAFFS2
2178
2179 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2180 static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
2181 int silent)
2182 {
2183 return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
2184 }
2185
2186 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2187 static int yaffs2_read_super(struct file_system_type *fs,
2188 int flags, const char *dev_name, void *data,
2189 struct vfsmount *mnt)
2190 {
2191 return get_sb_bdev(fs, flags, dev_name, data,
2192 yaffs2_internal_read_super_mtd, mnt);
2193 }
2194 #else
2195 static struct super_block *yaffs2_read_super(struct file_system_type *fs,
2196 int flags, const char *dev_name,
2197 void *data)
2198 {
2199
2200 return get_sb_bdev(fs, flags, dev_name, data,
2201 yaffs2_internal_read_super_mtd);
2202 }
2203 #endif
2204
2205 static struct file_system_type yaffs2_fs_type = {
2206 .owner = THIS_MODULE,
2207 .name = "yaffs2",
2208 .get_sb = yaffs2_read_super,
2209 .kill_sb = kill_block_super,
2210 .fs_flags = FS_REQUIRES_DEV,
2211 };
2212 #else
2213 static struct super_block *yaffs2_read_super(struct super_block *sb,
2214 void *data, int silent)
2215 {
2216 return yaffs_internal_read_super(2, sb, data, silent);
2217 }
2218
2219 static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super,
2220 FS_REQUIRES_DEV);
2221 #endif
2222
2223 #endif /* CONFIG_YAFFS_YAFFS2 */
2224
2225 static struct proc_dir_entry *my_proc_entry;
2226
2227 static char *yaffs_dump_dev(char *buf, yaffs_Device * dev)
2228 {
2229 buf += sprintf(buf, "startBlock......... %d\n", dev->startBlock);
2230 buf += sprintf(buf, "endBlock........... %d\n", dev->endBlock);
2231 buf += sprintf(buf, "totalBytesPerChunk. %d\n", dev->totalBytesPerChunk);
2232 buf += sprintf(buf, "nDataBytesPerChunk. %d\n", dev->nDataBytesPerChunk);
2233 buf += sprintf(buf, "chunkGroupBits..... %d\n", dev->chunkGroupBits);
2234 buf += sprintf(buf, "chunkGroupSize..... %d\n", dev->chunkGroupSize);
2235 buf += sprintf(buf, "nErasedBlocks...... %d\n", dev->nErasedBlocks);
2236 buf += sprintf(buf, "nReservedBlocks.... %d\n", dev->nReservedBlocks);
2237 buf += sprintf(buf, "blocksInCheckpoint. %d\n", dev->blocksInCheckpoint);
2238 buf += sprintf(buf, "nTnodesCreated..... %d\n", dev->nTnodesCreated);
2239 buf += sprintf(buf, "nFreeTnodes........ %d\n", dev->nFreeTnodes);
2240 buf += sprintf(buf, "nObjectsCreated.... %d\n", dev->nObjectsCreated);
2241 buf += sprintf(buf, "nFreeObjects....... %d\n", dev->nFreeObjects);
2242 buf += sprintf(buf, "nFreeChunks........ %d\n", dev->nFreeChunks);
2243 buf += sprintf(buf, "nPageWrites........ %d\n", dev->nPageWrites);
2244 buf += sprintf(buf, "nPageReads......... %d\n", dev->nPageReads);
2245 buf += sprintf(buf, "nBlockErasures..... %d\n", dev->nBlockErasures);
2246 buf += sprintf(buf, "nGCCopies.......... %d\n", dev->nGCCopies);
2247 buf += sprintf(buf, "garbageCollections. %d\n", dev->garbageCollections);
2248 buf += sprintf(buf, "passiveGCs......... %d\n",
2249 dev->passiveGarbageCollections);
2250 buf += sprintf(buf, "nRetriedWrites..... %d\n", dev->nRetriedWrites);
2251 buf += sprintf(buf, "nShortOpCaches..... %d\n", dev->nShortOpCaches);
2252 buf += sprintf(buf, "nRetireBlocks...... %d\n", dev->nRetiredBlocks);
2253 buf += sprintf(buf, "eccFixed........... %d\n", dev->eccFixed);
2254 buf += sprintf(buf, "eccUnfixed......... %d\n", dev->eccUnfixed);
2255 buf += sprintf(buf, "tagsEccFixed....... %d\n", dev->tagsEccFixed);
2256 buf += sprintf(buf, "tagsEccUnfixed..... %d\n", dev->tagsEccUnfixed);
2257 buf += sprintf(buf, "cacheHits.......... %d\n", dev->cacheHits);
2258 buf += sprintf(buf, "nDeletedFiles...... %d\n", dev->nDeletedFiles);
2259 buf += sprintf(buf, "nUnlinkedFiles..... %d\n", dev->nUnlinkedFiles);
2260 buf +=
2261 sprintf(buf, "nBackgroudDeletions %d\n", dev->nBackgroundDeletions);
2262 buf += sprintf(buf, "useNANDECC......... %d\n", dev->useNANDECC);
2263 buf += sprintf(buf, "isYaffs2........... %d\n", dev->isYaffs2);
2264 buf += sprintf(buf, "inbandTags......... %d\n", dev->inbandTags);
2265
2266 return buf;
2267 }
2268
2269 static int yaffs_proc_read(char *page,
2270 char **start,
2271 off_t offset, int count, int *eof, void *data)
2272 {
2273 struct ylist_head *item;
2274 char *buf = page;
2275 int step = offset;
2276 int n = 0;
2277
2278 /* Get proc_file_read() to step 'offset' by one on each sucessive call.
2279 * We use 'offset' (*ppos) to indicate where we are in devList.
2280 * This also assumes the user has posted a read buffer large
2281 * enough to hold the complete output; but that's life in /proc.
2282 */
2283
2284 *(int *)start = 1;
2285
2286 /* Print header first */
2287 if (step == 0) {
2288 buf += sprintf(buf, "YAFFS built:" __DATE__ " " __TIME__
2289 "\n%s\n%s\n", yaffs_fs_c_version,
2290 yaffs_guts_c_version);
2291 }
2292
2293 /* hold lock_kernel while traversing yaffs_dev_list */
2294 lock_kernel();
2295
2296 /* Locate and print the Nth entry. Order N-squared but N is small. */
2297 ylist_for_each(item, &yaffs_dev_list) {
2298 yaffs_Device *dev = ylist_entry(item, yaffs_Device, devList);
2299 if (n < step) {
2300 n++;
2301 continue;
2302 }
2303 buf += sprintf(buf, "\nDevice %d \"%s\"\n", n, dev->name);
2304 buf = yaffs_dump_dev(buf, dev);
2305 break;
2306 }
2307 unlock_kernel();
2308
2309 return buf - page < count ? buf - page : count;
2310 }
2311
2312 /**
2313 * Set the verbosity of the warnings and error messages.
2314 *
2315 * Note that the names can only be a..z or _ with the current code.
2316 */
2317
2318 static struct {
2319 char *mask_name;
2320 unsigned mask_bitfield;
2321 } mask_flags[] = {
2322 {"allocate", YAFFS_TRACE_ALLOCATE},
2323 {"always", YAFFS_TRACE_ALWAYS},
2324 {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
2325 {"buffers", YAFFS_TRACE_BUFFERS},
2326 {"bug", YAFFS_TRACE_BUG},
2327 {"checkpt", YAFFS_TRACE_CHECKPOINT},
2328 {"deletion", YAFFS_TRACE_DELETION},
2329 {"erase", YAFFS_TRACE_ERASE},
2330 {"error", YAFFS_TRACE_ERROR},
2331 {"gc_detail", YAFFS_TRACE_GC_DETAIL},
2332 {"gc", YAFFS_TRACE_GC},
2333 {"mtd", YAFFS_TRACE_MTD},
2334 {"nandaccess", YAFFS_TRACE_NANDACCESS},
2335 {"os", YAFFS_TRACE_OS},
2336 {"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
2337 {"scan", YAFFS_TRACE_SCAN},
2338 {"tracing", YAFFS_TRACE_TRACING},
2339
2340 {"verify", YAFFS_TRACE_VERIFY},
2341 {"verify_nand", YAFFS_TRACE_VERIFY_NAND},
2342 {"verify_full", YAFFS_TRACE_VERIFY_FULL},
2343 {"verify_all", YAFFS_TRACE_VERIFY_ALL},
2344
2345 {"write", YAFFS_TRACE_WRITE},
2346 {"all", 0xffffffff},
2347 {"none", 0},
2348 {NULL, 0},
2349 };
2350
2351 #define MAX_MASK_NAME_LENGTH 40
2352 static int yaffs_proc_write(struct file *file, const char *buf,
2353 unsigned long count, void *data)
2354 {
2355 unsigned rg = 0, mask_bitfield;
2356 char *end;
2357 char *mask_name;
2358 const char *x;
2359 char substring[MAX_MASK_NAME_LENGTH + 1];
2360 int i;
2361 int done = 0;
2362 int add, len = 0;
2363 int pos = 0;
2364
2365 rg = yaffs_traceMask;
2366
2367 while (!done && (pos < count)) {
2368 done = 1;
2369 while ((pos < count) && isspace(buf[pos]))
2370 pos++;
2371
2372 switch (buf[pos]) {
2373 case '+':
2374 case '-':
2375 case '=':
2376 add = buf[pos];
2377 pos++;
2378 break;
2379
2380 default:
2381 add = ' ';
2382 break;
2383 }
2384 mask_name = NULL;
2385
2386 mask_bitfield = simple_strtoul(buf + pos, &end, 0);
2387
2388 if (end > buf + pos) {
2389 mask_name = "numeral";
2390 len = end - (buf + pos);
2391 pos += len;
2392 done = 0;
2393 } else {
2394 for (x = buf + pos, i = 0;
2395 (*x == '_' || (*x >= 'a' && *x <= 'z')) &&
2396 i < MAX_MASK_NAME_LENGTH; x++, i++, pos++)
2397 substring[i] = *x;
2398 substring[i] = '\0';
2399
2400 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
2401 if (strcmp(substring, mask_flags[i].mask_name) == 0) {
2402 mask_name = mask_flags[i].mask_name;
2403 mask_bitfield = mask_flags[i].mask_bitfield;
2404 done = 0;
2405 break;
2406 }
2407 }
2408 }
2409
2410 if (mask_name != NULL) {
2411 done = 0;
2412 switch (add) {
2413 case '-':
2414 rg &= ~mask_bitfield;
2415 break;
2416 case '+':
2417 rg |= mask_bitfield;
2418 break;
2419 case '=':
2420 rg = mask_bitfield;
2421 break;
2422 default:
2423 rg |= mask_bitfield;
2424 break;
2425 }
2426 }
2427 }
2428
2429 yaffs_traceMask = rg | YAFFS_TRACE_ALWAYS;
2430
2431 printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_traceMask);
2432
2433 if (rg & YAFFS_TRACE_ALWAYS) {
2434 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
2435 char flag;
2436 flag = ((rg & mask_flags[i].mask_bitfield) == mask_flags[i].mask_bitfield) ? '+' : '-';
2437 printk(KERN_DEBUG "%c%s\n", flag, mask_flags[i].mask_name);
2438 }
2439 }
2440
2441 return count;
2442 }
2443
2444 /* Stuff to handle installation of file systems */
2445 struct file_system_to_install {
2446 struct file_system_type *fst;
2447 int installed;
2448 };
2449
2450 static struct file_system_to_install fs_to_install[] = {
2451 {&yaffs_fs_type, 0},
2452 {&yaffs2_fs_type, 0},
2453 {NULL, 0}
2454 };
2455
2456 static int __init init_yaffs_fs(void)
2457 {
2458 int error = 0;
2459 struct file_system_to_install *fsinst;
2460
2461 T(YAFFS_TRACE_ALWAYS,
2462 ("yaffs " __DATE__ " " __TIME__ " Installing. \n"));
2463
2464 /* Install the proc_fs entry */
2465 my_proc_entry = create_proc_entry("yaffs",
2466 S_IRUGO | S_IFREG,
2467 YPROC_ROOT);
2468
2469 if (my_proc_entry) {
2470 my_proc_entry->write_proc = yaffs_proc_write;
2471 my_proc_entry->read_proc = yaffs_proc_read;
2472 my_proc_entry->data = NULL;
2473 } else
2474 return -ENOMEM;
2475
2476 /* Now add the file system entries */
2477
2478 fsinst = fs_to_install;
2479
2480 while (fsinst->fst && !error) {
2481 error = register_filesystem(fsinst->fst);
2482 if (!error)
2483 fsinst->installed = 1;
2484 fsinst++;
2485 }
2486
2487 /* Any errors? uninstall */
2488 if (error) {
2489 fsinst = fs_to_install;
2490
2491 while (fsinst->fst) {
2492 if (fsinst->installed) {
2493 unregister_filesystem(fsinst->fst);
2494 fsinst->installed = 0;
2495 }
2496 fsinst++;
2497 }
2498 }
2499
2500 return error;
2501 }
2502
2503 static void __exit exit_yaffs_fs(void)
2504 {
2505
2506 struct file_system_to_install *fsinst;
2507
2508 T(YAFFS_TRACE_ALWAYS, ("yaffs " __DATE__ " " __TIME__
2509 " removing. \n"));
2510
2511 remove_proc_entry("yaffs", YPROC_ROOT);
2512
2513 fsinst = fs_to_install;
2514
2515 while (fsinst->fst) {
2516 if (fsinst->installed) {
2517 unregister_filesystem(fsinst->fst);
2518 fsinst->installed = 0;
2519 }
2520 fsinst++;
2521 }
2522 }
2523
2524 module_init(init_yaffs_fs)
2525 module_exit(exit_yaffs_fs)
2526
2527 MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
2528 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2006");
2529 MODULE_LICENSE("GPL");
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