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[openwrt/staging/yousong.git] / target / linux / generic / files / fs / yaffs2 / yaffs_vfs.c
1 /*
2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
3 *
4 * Copyright (C) 2002-2011 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 struct yaffs_dev associated with
28 * this superblock
29 * >> 2.6: sb->s_fs_info points to the struct yaffs_dev associated with this
30 * superblock
31 * >> inode->u.generic_ip points to the associated struct yaffs_obj.
32 */
33
34 /*
35 * There are two variants of the VFS glue code. This variant should compile
36 * for any version of Linux.
37 */
38 #include <linux/version.h>
39
40 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 10))
41 #define YAFFS_COMPILE_BACKGROUND
42 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23))
43 #define YAFFS_COMPILE_FREEZER
44 #endif
45 #endif
46
47 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 28))
48 #define YAFFS_COMPILE_EXPORTFS
49 #endif
50
51 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 35))
52 #define YAFFS_USE_SETATTR_COPY
53 #define YAFFS_USE_TRUNCATE_SETSIZE
54 #endif
55 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 35))
56 #define YAFFS_HAS_EVICT_INODE
57 #endif
58
59 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
60 #define YAFFS_NEW_FOLLOW_LINK 1
61 #else
62 #define YAFFS_NEW_FOLLOW_LINK 0
63 #endif
64
65 #if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 6, 0))
66 #define YAFFS_HAS_WRITE_SUPER
67 #endif
68
69
70 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
71 #include <linux/config.h>
72 #endif
73
74 #include <linux/kernel.h>
75 #include <linux/module.h>
76 #include <linux/slab.h>
77 #include <linux/init.h>
78 #include <linux/fs.h>
79 #include <linux/proc_fs.h>
80 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 39))
81 #include <linux/smp_lock.h>
82 #endif
83 #include <linux/pagemap.h>
84 #include <linux/mtd/mtd.h>
85 #include <linux/interrupt.h>
86 #include <linux/string.h>
87 #include <linux/ctype.h>
88
89 #if (YAFFS_NEW_FOLLOW_LINK == 1)
90 #include <linux/namei.h>
91 #endif
92
93 #ifdef YAFFS_COMPILE_EXPORTFS
94 #include <linux/exportfs.h>
95 #endif
96
97 #ifdef YAFFS_COMPILE_BACKGROUND
98 #include <linux/kthread.h>
99 #include <linux/delay.h>
100 #endif
101 #ifdef YAFFS_COMPILE_FREEZER
102 #include <linux/freezer.h>
103 #endif
104
105 #include <asm/div64.h>
106
107 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
108
109 #include <linux/statfs.h>
110
111 #define UnlockPage(p) unlock_page(p)
112 #define Page_Uptodate(page) test_bit(PG_uptodate, &(page)->flags)
113
114 /* FIXME: use sb->s_id instead ? */
115 #define yaffs_devname(sb, buf) bdevname(sb->s_bdev, buf)
116
117 #else
118
119 #include <linux/locks.h>
120 #define BDEVNAME_SIZE 0
121 #define yaffs_devname(sb, buf) kdevname(sb->s_dev)
122
123 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0))
124 /* added NCB 26/5/2006 for 2.4.25-vrs2-tcl1 kernel */
125 #define __user
126 #endif
127
128 #endif
129
130 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26))
131 #define YPROC_ROOT (&proc_root)
132 #else
133 #define YPROC_ROOT NULL
134 #endif
135
136 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26))
137 #define Y_INIT_TIMER(a) init_timer(a)
138 #else
139 #define Y_INIT_TIMER(a) init_timer_on_stack(a)
140 #endif
141
142 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 27))
143 #define YAFFS_USE_WRITE_BEGIN_END 1
144 #else
145 #define YAFFS_USE_WRITE_BEGIN_END 0
146 #endif
147
148 #if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 6, 0))
149 #define YAFFS_SUPER_HAS_DIRTY
150 #endif
151
152
153 #if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 2, 0))
154 #define set_nlink(inode, count) do { (inode)->i_nlink = (count); } while(0)
155 #endif
156
157 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 28))
158 static uint32_t YCALCBLOCKS(uint64_t partition_size, uint32_t block_size)
159 {
160 uint64_t result = partition_size;
161 do_div(result, block_size);
162 return (uint32_t) result;
163 }
164 #else
165 #define YCALCBLOCKS(s, b) ((s)/(b))
166 #endif
167
168 #include <linux/uaccess.h>
169 #include <linux/mtd/mtd.h>
170
171 #include "yportenv.h"
172 #include "yaffs_trace.h"
173 #include "yaffs_guts.h"
174 #include "yaffs_attribs.h"
175
176 #include "yaffs_linux.h"
177
178 #include "yaffs_mtdif.h"
179 #include "yaffs_packedtags2.h"
180 #include "yaffs_getblockinfo.h"
181
182 unsigned int yaffs_trace_mask =
183 YAFFS_TRACE_BAD_BLOCKS |
184 YAFFS_TRACE_ALWAYS |
185 0;
186
187 unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS;
188 unsigned int yaffs_auto_checkpoint = 1;
189 unsigned int yaffs_gc_control = 1;
190 unsigned int yaffs_bg_enable = 1;
191 unsigned int yaffs_auto_select = 1;
192 /* Module Parameters */
193 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
194 module_param(yaffs_trace_mask, uint, 0644);
195 module_param(yaffs_wr_attempts, uint, 0644);
196 module_param(yaffs_auto_checkpoint, uint, 0644);
197 module_param(yaffs_gc_control, uint, 0644);
198 module_param(yaffs_bg_enable, uint, 0644);
199 #else
200 MODULE_PARM(yaffs_trace_mask, "i");
201 MODULE_PARM(yaffs_wr_attempts, "i");
202 MODULE_PARM(yaffs_auto_checkpoint, "i");
203 MODULE_PARM(yaffs_gc_control, "i");
204 #endif
205
206 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25))
207 /* use iget and read_inode */
208 #define Y_IGET(sb, inum) iget((sb), (inum))
209
210 #else
211 /* Call local equivalent */
212 #define YAFFS_USE_OWN_IGET
213 #define Y_IGET(sb, inum) yaffs_iget((sb), (inum))
214
215 #endif
216
217 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
218 #define yaffs_inode_to_obj_lv(iptr) ((iptr)->i_private)
219 #else
220 #define yaffs_inode_to_obj_lv(iptr) ((iptr)->u.generic_ip)
221 #endif
222
223 #define yaffs_inode_to_obj(iptr) \
224 ((struct yaffs_obj *)(yaffs_inode_to_obj_lv(iptr)))
225 #define yaffs_dentry_to_obj(dptr) yaffs_inode_to_obj((dptr)->d_inode)
226
227 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
228 #define yaffs_super_to_dev(sb) ((struct yaffs_dev *)sb->s_fs_info)
229 #else
230 #define yaffs_super_to_dev(sb) ((struct yaffs_dev *)sb->u.generic_sbp)
231 #endif
232
233 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0))
234 #define Y_CLEAR_INODE(i) clear_inode(i)
235 #else
236 #define Y_CLEAR_INODE(i) end_writeback(i)
237 #endif
238
239
240 #define update_dir_time(dir) do {\
241 (dir)->i_ctime = (dir)->i_mtime = CURRENT_TIME; \
242 } while (0)
243
244 static void yaffs_fill_inode_from_obj(struct inode *inode,
245 struct yaffs_obj *obj);
246
247
248 static void yaffs_gross_lock(struct yaffs_dev *dev)
249 {
250 yaffs_trace(YAFFS_TRACE_LOCK, "yaffs locking %p", current);
251 mutex_lock(&(yaffs_dev_to_lc(dev)->gross_lock));
252 yaffs_trace(YAFFS_TRACE_LOCK, "yaffs locked %p", current);
253 }
254
255 static void yaffs_gross_unlock(struct yaffs_dev *dev)
256 {
257 yaffs_trace(YAFFS_TRACE_LOCK, "yaffs unlocking %p", current);
258 mutex_unlock(&(yaffs_dev_to_lc(dev)->gross_lock));
259 }
260
261
262 static int yaffs_readpage_nolock(struct file *f, struct page *pg)
263 {
264 /* Lifted from jffs2 */
265
266 struct yaffs_obj *obj;
267 unsigned char *pg_buf;
268 int ret;
269 loff_t pos = ((loff_t) pg->index) << PAGE_CACHE_SHIFT;
270 struct yaffs_dev *dev;
271
272 yaffs_trace(YAFFS_TRACE_OS,
273 "yaffs_readpage_nolock at %lld, size %08x",
274 (long long)pos,
275 (unsigned)PAGE_CACHE_SIZE);
276
277 obj = yaffs_dentry_to_obj(f->f_dentry);
278
279 dev = obj->my_dev;
280
281 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
282 BUG_ON(!PageLocked(pg));
283 #else
284 if (!PageLocked(pg))
285 PAGE_BUG(pg);
286 #endif
287
288 pg_buf = kmap(pg);
289 /* FIXME: Can kmap fail? */
290
291 yaffs_gross_lock(dev);
292
293 ret = yaffs_file_rd(obj, pg_buf, pos, PAGE_CACHE_SIZE);
294
295 yaffs_gross_unlock(dev);
296
297 if (ret >= 0)
298 ret = 0;
299
300 if (ret) {
301 ClearPageUptodate(pg);
302 SetPageError(pg);
303 } else {
304 SetPageUptodate(pg);
305 ClearPageError(pg);
306 }
307
308 flush_dcache_page(pg);
309 kunmap(pg);
310
311 yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage_nolock done");
312 return ret;
313 }
314
315 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
316 {
317 int ret = yaffs_readpage_nolock(f, pg);
318 UnlockPage(pg);
319 return ret;
320 }
321
322 static int yaffs_readpage(struct file *f, struct page *pg)
323 {
324 int ret;
325
326 yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage");
327 ret = yaffs_readpage_unlock(f, pg);
328 yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage done");
329 return ret;
330 }
331
332
333 static void yaffs_set_super_dirty_val(struct yaffs_dev *dev, int val)
334 {
335 struct yaffs_linux_context *lc = yaffs_dev_to_lc(dev);
336
337 if (lc)
338 lc->dirty = val;
339
340 # ifdef YAFFS_SUPER_HAS_DIRTY
341 {
342 struct super_block *sb = lc->super;
343
344 if (sb)
345 sb->s_dirt = val;
346 }
347 #endif
348
349 }
350
351 static void yaffs_set_super_dirty(struct yaffs_dev *dev)
352 {
353 yaffs_set_super_dirty_val(dev, 1);
354 }
355
356 static void yaffs_clear_super_dirty(struct yaffs_dev *dev)
357 {
358 yaffs_set_super_dirty_val(dev, 0);
359 }
360
361 static int yaffs_check_super_dirty(struct yaffs_dev *dev)
362 {
363 struct yaffs_linux_context *lc = yaffs_dev_to_lc(dev);
364
365 if (lc && lc->dirty)
366 return 1;
367
368 # ifdef YAFFS_SUPER_HAS_DIRTY
369 {
370 struct super_block *sb = lc->super;
371
372 if (sb && sb->s_dirt)
373 return 1;
374 }
375 #endif
376 return 0;
377
378 }
379
380 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
381 static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
382 #else
383 static int yaffs_writepage(struct page *page)
384 #endif
385 {
386 struct yaffs_dev *dev;
387 struct address_space *mapping = page->mapping;
388 struct inode *inode;
389 unsigned long end_index;
390 char *buffer;
391 struct yaffs_obj *obj;
392 int n_written = 0;
393 unsigned n_bytes;
394 loff_t i_size;
395
396 if (!mapping)
397 BUG();
398 inode = mapping->host;
399 if (!inode)
400 BUG();
401 i_size = i_size_read(inode);
402
403 end_index = i_size >> PAGE_CACHE_SHIFT;
404
405 if (page->index < end_index)
406 n_bytes = PAGE_CACHE_SIZE;
407 else {
408 n_bytes = i_size & (PAGE_CACHE_SIZE - 1);
409
410 if (page->index > end_index || !n_bytes) {
411 yaffs_trace(YAFFS_TRACE_OS,
412 "yaffs_writepage at %lld, inode size = %lld!!",
413 ((loff_t)page->index) << PAGE_CACHE_SHIFT,
414 inode->i_size);
415 yaffs_trace(YAFFS_TRACE_OS,
416 " -> don't care!!");
417
418 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
419 set_page_writeback(page);
420 unlock_page(page);
421 end_page_writeback(page);
422 return 0;
423 }
424 }
425
426 if (n_bytes != PAGE_CACHE_SIZE)
427 zero_user_segment(page, n_bytes, PAGE_CACHE_SIZE);
428
429 get_page(page);
430
431 buffer = kmap(page);
432
433 obj = yaffs_inode_to_obj(inode);
434 dev = obj->my_dev;
435 yaffs_gross_lock(dev);
436
437 yaffs_trace(YAFFS_TRACE_OS,
438 "yaffs_writepage at %lld, size %08x",
439 ((loff_t)page->index) << PAGE_CACHE_SHIFT, n_bytes);
440 yaffs_trace(YAFFS_TRACE_OS,
441 "writepag0: obj = %lld, ino = %lld",
442 obj->variant.file_variant.file_size, inode->i_size);
443
444 n_written = yaffs_wr_file(obj, buffer,
445 ((loff_t)page->index) << PAGE_CACHE_SHIFT, n_bytes, 0);
446
447 yaffs_set_super_dirty(dev);
448
449 yaffs_trace(YAFFS_TRACE_OS,
450 "writepag1: obj = %lld, ino = %lld",
451 obj->variant.file_variant.file_size, inode->i_size);
452
453 yaffs_gross_unlock(dev);
454
455 kunmap(page);
456 set_page_writeback(page);
457 unlock_page(page);
458 end_page_writeback(page);
459 put_page(page);
460
461 return (n_written == n_bytes) ? 0 : -ENOSPC;
462 }
463
464 /* Space holding and freeing is done to ensure we have space available for write_begin/end */
465 /* For now we just assume few parallel writes and check against a small number. */
466 /* Todo: need to do this with a counter to handle parallel reads better */
467
468 static ssize_t yaffs_hold_space(struct file *f)
469 {
470 struct yaffs_obj *obj;
471 struct yaffs_dev *dev;
472
473 int n_free_chunks;
474
475 obj = yaffs_dentry_to_obj(f->f_dentry);
476
477 dev = obj->my_dev;
478
479 yaffs_gross_lock(dev);
480
481 n_free_chunks = yaffs_get_n_free_chunks(dev);
482
483 yaffs_gross_unlock(dev);
484
485 return (n_free_chunks > 20) ? 1 : 0;
486 }
487
488 static void yaffs_release_space(struct file *f)
489 {
490 struct yaffs_obj *obj;
491 struct yaffs_dev *dev;
492
493 obj = yaffs_dentry_to_obj(f->f_dentry);
494
495 dev = obj->my_dev;
496
497 yaffs_gross_lock(dev);
498
499 yaffs_gross_unlock(dev);
500 }
501
502 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
503 static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
504 loff_t pos, unsigned len, unsigned flags,
505 struct page **pagep, void **fsdata)
506 {
507 struct page *pg = NULL;
508 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
509
510 int ret = 0;
511 int space_held = 0;
512
513 /* Get a page */
514 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 28)
515 pg = grab_cache_page_write_begin(mapping, index, flags);
516 #else
517 pg = __grab_cache_page(mapping, index);
518 #endif
519
520 *pagep = pg;
521 if (!pg) {
522 ret = -ENOMEM;
523 goto out;
524 }
525 yaffs_trace(YAFFS_TRACE_OS,
526 "start yaffs_write_begin index %d(%x) uptodate %d",
527 (int)index, (int)index, Page_Uptodate(pg) ? 1 : 0);
528
529 /* Get fs space */
530 space_held = yaffs_hold_space(filp);
531
532 if (!space_held) {
533 ret = -ENOSPC;
534 goto out;
535 }
536
537 /* Update page if required */
538
539 if (!Page_Uptodate(pg))
540 ret = yaffs_readpage_nolock(filp, pg);
541
542 if (ret)
543 goto out;
544
545 /* Happy path return */
546 yaffs_trace(YAFFS_TRACE_OS, "end yaffs_write_begin - ok");
547
548 return 0;
549
550 out:
551 yaffs_trace(YAFFS_TRACE_OS,
552 "end yaffs_write_begin fail returning %d", ret);
553 if (space_held)
554 yaffs_release_space(filp);
555 if (pg) {
556 unlock_page(pg);
557 page_cache_release(pg);
558 }
559 return ret;
560 }
561
562 #else
563
564 static int yaffs_prepare_write(struct file *f, struct page *pg,
565 unsigned offset, unsigned to)
566 {
567 yaffs_trace(YAFFS_TRACE_OS, "yaffs_prepair_write");
568
569 if (!Page_Uptodate(pg))
570 return yaffs_readpage_nolock(f, pg);
571 return 0;
572 }
573 #endif
574
575
576 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
577 loff_t * pos)
578 {
579 struct yaffs_obj *obj;
580 int n_written;
581 loff_t ipos;
582 struct inode *inode;
583 struct yaffs_dev *dev;
584
585 obj = yaffs_dentry_to_obj(f->f_dentry);
586
587 if (!obj) {
588 yaffs_trace(YAFFS_TRACE_OS,
589 "yaffs_file_write: hey obj is null!");
590 return -EINVAL;
591 }
592
593 dev = obj->my_dev;
594
595 yaffs_gross_lock(dev);
596
597 inode = f->f_dentry->d_inode;
598
599 if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
600 ipos = inode->i_size;
601 else
602 ipos = *pos;
603
604 yaffs_trace(YAFFS_TRACE_OS,
605 "yaffs_file_write about to write writing %u(%x) bytes to object %d at %lld",
606 (unsigned)n, (unsigned)n, obj->obj_id, ipos);
607
608 n_written = yaffs_wr_file(obj, buf, ipos, n, 0);
609
610 yaffs_set_super_dirty(dev);
611
612 yaffs_trace(YAFFS_TRACE_OS,
613 "yaffs_file_write: %d(%x) bytes written",
614 (unsigned)n, (unsigned)n);
615
616 if (n_written > 0) {
617 ipos += n_written;
618 *pos = ipos;
619 if (ipos > inode->i_size) {
620 inode->i_size = ipos;
621 inode->i_blocks = (ipos + 511) >> 9;
622
623 yaffs_trace(YAFFS_TRACE_OS,
624 "yaffs_file_write size updated to %lld bytes, %d blocks",
625 ipos, (int)(inode->i_blocks));
626 }
627
628 }
629 yaffs_gross_unlock(dev);
630 return (n_written == 0) && (n > 0) ? -ENOSPC : n_written;
631 }
632
633
634 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
635 static int yaffs_write_end(struct file *filp, struct address_space *mapping,
636 loff_t pos, unsigned len, unsigned copied,
637 struct page *pg, void *fsdadata)
638 {
639 int ret = 0;
640 void *addr, *kva;
641 uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE - 1);
642
643 kva = kmap(pg);
644 addr = kva + offset_into_page;
645
646 yaffs_trace(YAFFS_TRACE_OS,
647 "yaffs_write_end addr %p pos %lld n_bytes %d",
648 addr, pos, copied);
649
650 ret = yaffs_file_write(filp, addr, copied, &pos);
651
652 if (ret != copied) {
653 yaffs_trace(YAFFS_TRACE_OS,
654 "yaffs_write_end not same size ret %d copied %d",
655 ret, copied);
656 SetPageError(pg);
657 }
658
659 kunmap(pg);
660
661 yaffs_release_space(filp);
662 unlock_page(pg);
663 page_cache_release(pg);
664 return ret;
665 }
666 #else
667
668 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
669 unsigned to)
670 {
671 void *addr, *kva;
672
673 loff_t pos = (((loff_t) pg->index) << PAGE_CACHE_SHIFT) + offset;
674 int n_bytes = to - offset;
675 int n_written;
676
677 kva = kmap(pg);
678 addr = kva + offset;
679
680 yaffs_trace(YAFFS_TRACE_OS,
681 "yaffs_commit_write addr %p pos %lld n_bytes %d",
682 addr, pos, n_bytes);
683
684 n_written = yaffs_file_write(f, addr, n_bytes, &pos);
685
686 if (n_written != n_bytes) {
687 yaffs_trace(YAFFS_TRACE_OS,
688 "yaffs_commit_write not same size n_written %d n_bytes %d",
689 n_written, n_bytes);
690 SetPageError(pg);
691 }
692 kunmap(pg);
693
694 yaffs_trace(YAFFS_TRACE_OS,
695 "yaffs_commit_write returning %d",
696 n_written == n_bytes ? 0 : n_written);
697
698 return n_written == n_bytes ? 0 : n_written;
699 }
700 #endif
701
702 static struct address_space_operations yaffs_file_address_operations = {
703 .readpage = yaffs_readpage,
704 .writepage = yaffs_writepage,
705 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
706 .write_begin = yaffs_write_begin,
707 .write_end = yaffs_write_end,
708 #else
709 .prepare_write = yaffs_prepare_write,
710 .commit_write = yaffs_commit_write,
711 #endif
712 };
713
714
715 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
716 static int yaffs_file_flush(struct file *file, fl_owner_t id)
717 #else
718 static int yaffs_file_flush(struct file *file)
719 #endif
720 {
721 struct yaffs_obj *obj = yaffs_dentry_to_obj(file->f_dentry);
722
723 struct yaffs_dev *dev = obj->my_dev;
724
725 yaffs_trace(YAFFS_TRACE_OS,
726 "yaffs_file_flush object %d (%s)",
727 obj->obj_id,
728 obj->dirty ? "dirty" : "clean");
729
730 yaffs_gross_lock(dev);
731
732 yaffs_flush_file(obj, 1, 0);
733
734 yaffs_gross_unlock(dev);
735
736 return 0;
737 }
738
739
740 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39))
741 static int yaffs_sync_object(struct file *file, loff_t start, loff_t end, int datasync)
742 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34))
743 static int yaffs_sync_object(struct file *file, int datasync)
744 #else
745 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
746 int datasync)
747 #endif
748 {
749 struct yaffs_obj *obj;
750 struct yaffs_dev *dev;
751 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34))
752 struct dentry *dentry = file->f_path.dentry;
753 #endif
754
755 obj = yaffs_dentry_to_obj(dentry);
756
757 dev = obj->my_dev;
758
759 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
760 "yaffs_sync_object");
761 yaffs_gross_lock(dev);
762 yaffs_flush_file(obj, 1, datasync);
763 yaffs_gross_unlock(dev);
764 return 0;
765 }
766
767
768 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 22))
769 static const struct file_operations yaffs_file_operations = {
770 .read = do_sync_read,
771 .write = do_sync_write,
772 .aio_read = generic_file_aio_read,
773 .aio_write = generic_file_aio_write,
774 .mmap = generic_file_mmap,
775 .flush = yaffs_file_flush,
776 .fsync = yaffs_sync_object,
777 .splice_read = generic_file_splice_read,
778 .splice_write = generic_file_splice_write,
779 .llseek = generic_file_llseek,
780 };
781
782 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
783
784 static const struct file_operations yaffs_file_operations = {
785 .read = do_sync_read,
786 .write = do_sync_write,
787 .aio_read = generic_file_aio_read,
788 .aio_write = generic_file_aio_write,
789 .mmap = generic_file_mmap,
790 .flush = yaffs_file_flush,
791 .fsync = yaffs_sync_object,
792 .sendfile = generic_file_sendfile,
793 };
794
795 #else
796
797 static const struct file_operations yaffs_file_operations = {
798 .read = generic_file_read,
799 .write = generic_file_write,
800 .mmap = generic_file_mmap,
801 .flush = yaffs_file_flush,
802 .fsync = yaffs_sync_object,
803 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
804 .sendfile = generic_file_sendfile,
805 #endif
806 };
807 #endif
808
809
810
811
812 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25))
813 static void zero_user_segment(struct page *page, unsigned start, unsigned end)
814 {
815 void *kaddr = kmap_atomic(page, KM_USER0);
816 memset(kaddr + start, 0, end - start);
817 kunmap_atomic(kaddr, KM_USER0);
818 flush_dcache_page(page);
819 }
820 #endif
821
822
823 static int yaffs_vfs_setsize(struct inode *inode, loff_t newsize)
824 {
825 #ifdef YAFFS_USE_TRUNCATE_SETSIZE
826 truncate_setsize(inode, newsize);
827 return 0;
828 #else
829 truncate_inode_pages(&inode->i_data, newsize);
830 return 0;
831 #endif
832
833 }
834
835
836 static int yaffs_vfs_setattr(struct inode *inode, struct iattr *attr)
837 {
838 #ifdef YAFFS_USE_SETATTR_COPY
839 setattr_copy(inode, attr);
840 return 0;
841 #else
842 return inode_setattr(inode, attr);
843 #endif
844
845 }
846
847 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
848 {
849 struct inode *inode = dentry->d_inode;
850 int error = 0;
851 struct yaffs_dev *dev;
852
853 yaffs_trace(YAFFS_TRACE_OS,
854 "yaffs_setattr of object %d",
855 yaffs_inode_to_obj(inode)->obj_id);
856 #if 0
857 /* Fail if a requested resize >= 2GB */
858 if (attr->ia_valid & ATTR_SIZE && (attr->ia_size >> 31))
859 error = -EINVAL;
860 #endif
861
862 if (error == 0)
863 error = inode_change_ok(inode, attr);
864 if (error == 0) {
865 int result;
866 if (!error) {
867 error = yaffs_vfs_setattr(inode, attr);
868 yaffs_trace(YAFFS_TRACE_OS, "inode_setattr called");
869 if (attr->ia_valid & ATTR_SIZE) {
870 yaffs_vfs_setsize(inode, attr->ia_size);
871 inode->i_blocks = (inode->i_size + 511) >> 9;
872 }
873 }
874 dev = yaffs_inode_to_obj(inode)->my_dev;
875 if (attr->ia_valid & ATTR_SIZE) {
876 yaffs_trace(YAFFS_TRACE_OS,
877 "resize to %d(%x)",
878 (int)(attr->ia_size),
879 (int)(attr->ia_size));
880 }
881 yaffs_gross_lock(dev);
882 result = yaffs_set_attribs(yaffs_inode_to_obj(inode), attr);
883 if (result == YAFFS_OK) {
884 error = 0;
885 } else {
886 error = -EPERM;
887 }
888 yaffs_gross_unlock(dev);
889
890 }
891
892 yaffs_trace(YAFFS_TRACE_OS, "yaffs_setattr done returning %d", error);
893
894 return error;
895 }
896
897 static int yaffs_setxattr(struct dentry *dentry, const char *name,
898 const void *value, size_t size, int flags)
899 {
900 struct inode *inode = dentry->d_inode;
901 int error = 0;
902 struct yaffs_dev *dev;
903 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
904
905 yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr of object %d", obj->obj_id);
906
907 if (error == 0) {
908 int result;
909 dev = obj->my_dev;
910 yaffs_gross_lock(dev);
911 result = yaffs_set_xattrib(obj, name, value, size, flags);
912 if (result == YAFFS_OK)
913 error = 0;
914 else if (result < 0)
915 error = result;
916 yaffs_gross_unlock(dev);
917
918 }
919 yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr done returning %d", error);
920
921 return error;
922 }
923
924 static ssize_t yaffs_getxattr(struct dentry * dentry, const char *name,
925 void *buff, size_t size)
926 {
927 struct inode *inode = dentry->d_inode;
928 int error = 0;
929 struct yaffs_dev *dev;
930 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
931
932 yaffs_trace(YAFFS_TRACE_OS,
933 "yaffs_getxattr \"%s\" from object %d",
934 name, obj->obj_id);
935
936 if (error == 0) {
937 dev = obj->my_dev;
938 yaffs_gross_lock(dev);
939 error = yaffs_get_xattrib(obj, name, buff, size);
940 yaffs_gross_unlock(dev);
941
942 }
943 yaffs_trace(YAFFS_TRACE_OS, "yaffs_getxattr done returning %d", error);
944
945 return error;
946 }
947
948 static int yaffs_removexattr(struct dentry *dentry, const char *name)
949 {
950 struct inode *inode = dentry->d_inode;
951 int error = 0;
952 struct yaffs_dev *dev;
953 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
954
955 yaffs_trace(YAFFS_TRACE_OS,
956 "yaffs_removexattr of object %d", obj->obj_id);
957
958 if (error == 0) {
959 int result;
960 dev = obj->my_dev;
961 yaffs_gross_lock(dev);
962 result = yaffs_remove_xattrib(obj, name);
963 if (result == YAFFS_OK)
964 error = 0;
965 else if (result < 0)
966 error = result;
967 yaffs_gross_unlock(dev);
968
969 }
970 yaffs_trace(YAFFS_TRACE_OS,
971 "yaffs_removexattr done returning %d", error);
972
973 return error;
974 }
975
976 static ssize_t yaffs_listxattr(struct dentry * dentry, char *buff, size_t size)
977 {
978 struct inode *inode = dentry->d_inode;
979 int error = 0;
980 struct yaffs_dev *dev;
981 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
982
983 yaffs_trace(YAFFS_TRACE_OS,
984 "yaffs_listxattr of object %d", obj->obj_id);
985
986 if (error == 0) {
987 dev = obj->my_dev;
988 yaffs_gross_lock(dev);
989 error = yaffs_list_xattrib(obj, buff, size);
990 yaffs_gross_unlock(dev);
991
992 }
993 yaffs_trace(YAFFS_TRACE_OS,
994 "yaffs_listxattr done returning %d", error);
995
996 return error;
997 }
998
999
1000 static const struct inode_operations yaffs_file_inode_operations = {
1001 .setattr = yaffs_setattr,
1002 .setxattr = yaffs_setxattr,
1003 .getxattr = yaffs_getxattr,
1004 .listxattr = yaffs_listxattr,
1005 .removexattr = yaffs_removexattr,
1006 };
1007
1008
1009 static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
1010 int buflen)
1011 {
1012 unsigned char *alias;
1013 int ret;
1014
1015 struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
1016
1017 yaffs_gross_lock(dev);
1018
1019 alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
1020
1021 yaffs_gross_unlock(dev);
1022
1023 if (!alias)
1024 return -ENOMEM;
1025
1026 ret = vfs_readlink(dentry, buffer, buflen, alias);
1027 kfree(alias);
1028 return ret;
1029 }
1030
1031 #if (YAFFS_NEW_FOLLOW_LINK == 1)
1032 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
1033 {
1034 void *ret;
1035 #else
1036 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
1037 {
1038 int ret
1039 #endif
1040 unsigned char *alias;
1041 int ret_int = 0;
1042 struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
1043
1044 yaffs_gross_lock(dev);
1045
1046 alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
1047 yaffs_gross_unlock(dev);
1048
1049 if (!alias) {
1050 ret_int = -ENOMEM;
1051 goto out;
1052 }
1053 #if (YAFFS_NEW_FOLLOW_LINK == 1)
1054 nd_set_link(nd, alias);
1055 ret = alias;
1056 out:
1057 if (ret_int)
1058 ret = ERR_PTR(ret_int);
1059 return ret;
1060 #else
1061 ret = vfs_follow_link(nd, alias);
1062 kfree(alias);
1063 out:
1064 if (ret_int)
1065 ret = ret_int;
1066 return ret;
1067 #endif
1068 }
1069
1070
1071 #ifdef YAFFS_HAS_PUT_INODE
1072
1073 /* For now put inode is just for debugging
1074 * Put inode is called when the inode **structure** is put.
1075 */
1076 static void yaffs_put_inode(struct inode *inode)
1077 {
1078 yaffs_trace(YAFFS_TRACE_OS,
1079 "yaffs_put_inode: ino %d, count %d"),
1080 (int)inode->i_ino, atomic_read(&inode->i_count);
1081
1082 }
1083 #endif
1084
1085 #if (YAFFS_NEW_FOLLOW_LINK == 1)
1086 void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias)
1087 {
1088 kfree(alias);
1089 }
1090 #endif
1091
1092 static const struct inode_operations yaffs_symlink_inode_operations = {
1093 .readlink = yaffs_readlink,
1094 .follow_link = yaffs_follow_link,
1095 #if (YAFFS_NEW_FOLLOW_LINK == 1)
1096 .put_link = yaffs_put_link,
1097 #endif
1098 .setattr = yaffs_setattr,
1099 .setxattr = yaffs_setxattr,
1100 .getxattr = yaffs_getxattr,
1101 .listxattr = yaffs_listxattr,
1102 .removexattr = yaffs_removexattr,
1103 };
1104
1105 #ifdef YAFFS_USE_OWN_IGET
1106
1107 static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino)
1108 {
1109 struct inode *inode;
1110 struct yaffs_obj *obj;
1111 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
1112
1113 yaffs_trace(YAFFS_TRACE_OS, "yaffs_iget for %lu", ino);
1114
1115 inode = iget_locked(sb, ino);
1116 if (!inode)
1117 return ERR_PTR(-ENOMEM);
1118 if (!(inode->i_state & I_NEW))
1119 return inode;
1120
1121 /* NB This is called as a side effect of other functions, but
1122 * we had to release the lock to prevent deadlocks, so
1123 * need to lock again.
1124 */
1125
1126 yaffs_gross_lock(dev);
1127
1128 obj = yaffs_find_by_number(dev, inode->i_ino);
1129
1130 yaffs_fill_inode_from_obj(inode, obj);
1131
1132 yaffs_gross_unlock(dev);
1133
1134 unlock_new_inode(inode);
1135 return inode;
1136 }
1137
1138 #else
1139
1140 static void yaffs_read_inode(struct inode *inode)
1141 {
1142 /* NB This is called as a side effect of other functions, but
1143 * we had to release the lock to prevent deadlocks, so
1144 * need to lock again.
1145 */
1146
1147 struct yaffs_obj *obj;
1148 struct yaffs_dev *dev = yaffs_super_to_dev(inode->i_sb);
1149
1150 yaffs_trace(YAFFS_TRACE_OS,
1151 "yaffs_read_inode for %d", (int)inode->i_ino);
1152
1153 if (current != yaffs_dev_to_lc(dev)->readdir_process)
1154 yaffs_gross_lock(dev);
1155
1156 obj = yaffs_find_by_number(dev, inode->i_ino);
1157
1158 yaffs_fill_inode_from_obj(inode, obj);
1159
1160 if (current != yaffs_dev_to_lc(dev)->readdir_process)
1161 yaffs_gross_unlock(dev);
1162 }
1163
1164 #endif
1165
1166
1167
1168 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
1169 struct yaffs_obj *obj)
1170 {
1171 struct inode *inode;
1172
1173 if (!sb) {
1174 yaffs_trace(YAFFS_TRACE_OS,
1175 "yaffs_get_inode for NULL super_block!!");
1176 return NULL;
1177
1178 }
1179
1180 if (!obj) {
1181 yaffs_trace(YAFFS_TRACE_OS,
1182 "yaffs_get_inode for NULL object!!");
1183 return NULL;
1184
1185 }
1186
1187 yaffs_trace(YAFFS_TRACE_OS,
1188 "yaffs_get_inode for object %d", obj->obj_id);
1189
1190 inode = Y_IGET(sb, obj->obj_id);
1191 if (IS_ERR(inode))
1192 return NULL;
1193
1194 /* NB Side effect: iget calls back to yaffs_read_inode(). */
1195 /* iget also increments the inode's i_count */
1196 /* NB You can't be holding gross_lock or deadlock will happen! */
1197
1198 return inode;
1199 }
1200
1201
1202
1203 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
1204 #define YCRED(x) x
1205 #else
1206 #define YCRED(x) (x->cred)
1207 #endif
1208
1209 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 4, 0))
1210 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1211 dev_t rdev)
1212 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1213 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1214 dev_t rdev)
1215 #else
1216 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1217 int rdev)
1218 #endif
1219 {
1220 struct inode *inode;
1221
1222 struct yaffs_obj *obj = NULL;
1223 struct yaffs_dev *dev;
1224
1225 struct yaffs_obj *parent = yaffs_inode_to_obj(dir);
1226
1227 int error = -ENOSPC;
1228 uid_t uid = YCRED(current)->fsuid;
1229 gid_t gid =
1230 (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
1231
1232 if ((dir->i_mode & S_ISGID) && S_ISDIR(mode))
1233 mode |= S_ISGID;
1234
1235 if (parent) {
1236 yaffs_trace(YAFFS_TRACE_OS,
1237 "yaffs_mknod: parent object %d type %d",
1238 parent->obj_id, parent->variant_type);
1239 } else {
1240 yaffs_trace(YAFFS_TRACE_OS,
1241 "yaffs_mknod: could not get parent object");
1242 return -EPERM;
1243 }
1244
1245 yaffs_trace(YAFFS_TRACE_OS,
1246 "yaffs_mknod: making oject for %s, mode %x dev %x",
1247 dentry->d_name.name, mode, rdev);
1248
1249 dev = parent->my_dev;
1250
1251 yaffs_gross_lock(dev);
1252
1253 switch (mode & S_IFMT) {
1254 default:
1255 /* Special (socket, fifo, device...) */
1256 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making special");
1257 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1258 obj =
1259 yaffs_create_special(parent, dentry->d_name.name, mode, uid,
1260 gid, old_encode_dev(rdev));
1261 #else
1262 obj =
1263 yaffs_create_special(parent, dentry->d_name.name, mode, uid,
1264 gid, rdev);
1265 #endif
1266 break;
1267 case S_IFREG: /* file */
1268 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making file");
1269 obj = yaffs_create_file(parent, dentry->d_name.name, mode, uid,
1270 gid);
1271 break;
1272 case S_IFDIR: /* directory */
1273 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making directory");
1274 obj = yaffs_create_dir(parent, dentry->d_name.name, mode,
1275 uid, gid);
1276 break;
1277 case S_IFLNK: /* symlink */
1278 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making symlink");
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_gross_unlock(dev);
1285
1286 if (obj) {
1287 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
1288 d_instantiate(dentry, inode);
1289 update_dir_time(dir);
1290 yaffs_trace(YAFFS_TRACE_OS,
1291 "yaffs_mknod created object %d count = %d",
1292 obj->obj_id, atomic_read(&inode->i_count));
1293 error = 0;
1294 yaffs_fill_inode_from_obj(dir, parent);
1295 } else {
1296 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod failed making object");
1297 error = -ENOMEM;
1298 }
1299
1300 return error;
1301 }
1302
1303 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 4, 0))
1304 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1305 #else
1306 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1307 #endif
1308 {
1309 int ret_val;
1310 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mkdir");
1311 ret_val = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
1312 return ret_val;
1313 }
1314
1315
1316 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 6, 0))
1317 static int yaffs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
1318 bool dummy)
1319 #elif (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 4, 0))
1320 static int yaffs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
1321 struct nameidata *n)
1322 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1323 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
1324 struct nameidata *n)
1325 #else
1326 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
1327 #endif
1328 {
1329 yaffs_trace(YAFFS_TRACE_OS, "yaffs_create");
1330 return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
1331 }
1332
1333 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 6, 0))
1334 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
1335 unsigned int dummy)
1336 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1337 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
1338 struct nameidata *n)
1339 #else
1340 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry)
1341 #endif
1342 {
1343 struct yaffs_obj *obj;
1344 struct inode *inode = NULL; /* NCB 2.5/2.6 needs NULL here */
1345
1346 struct yaffs_dev *dev = yaffs_inode_to_obj(dir)->my_dev;
1347
1348 if (current != yaffs_dev_to_lc(dev)->readdir_process)
1349 yaffs_gross_lock(dev);
1350
1351 yaffs_trace(YAFFS_TRACE_OS, "yaffs_lookup for %d:%s",
1352 yaffs_inode_to_obj(dir)->obj_id, dentry->d_name.name);
1353
1354 obj = yaffs_find_by_name(yaffs_inode_to_obj(dir), dentry->d_name.name);
1355
1356 obj = yaffs_get_equivalent_obj(obj); /* in case it was a hardlink */
1357
1358 /* Can't hold gross lock when calling yaffs_get_inode() */
1359 if (current != yaffs_dev_to_lc(dev)->readdir_process)
1360 yaffs_gross_unlock(dev);
1361
1362 if (obj) {
1363 yaffs_trace(YAFFS_TRACE_OS,
1364 "yaffs_lookup found %d", obj->obj_id);
1365
1366 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
1367 } else {
1368 yaffs_trace(YAFFS_TRACE_OS, "yaffs_lookup not found");
1369
1370 }
1371
1372 /* added NCB for 2.5/6 compatability - forces add even if inode is
1373 * NULL which creates dentry hash */
1374 d_add(dentry, inode);
1375
1376 return NULL;
1377 }
1378
1379 /*
1380 * Create a link...
1381 */
1382 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
1383 struct dentry *dentry)
1384 {
1385 struct inode *inode = old_dentry->d_inode;
1386 struct yaffs_obj *obj = NULL;
1387 struct yaffs_obj *link = NULL;
1388 struct yaffs_dev *dev;
1389
1390 yaffs_trace(YAFFS_TRACE_OS, "yaffs_link");
1391
1392 obj = yaffs_inode_to_obj(inode);
1393 dev = obj->my_dev;
1394
1395 yaffs_gross_lock(dev);
1396
1397 if (!S_ISDIR(inode->i_mode)) /* Don't link directories */
1398 link =
1399 yaffs_link_obj(yaffs_inode_to_obj(dir), dentry->d_name.name,
1400 obj);
1401
1402 if (link) {
1403 set_nlink(old_dentry->d_inode, yaffs_get_obj_link_count(obj));
1404 d_instantiate(dentry, old_dentry->d_inode);
1405 atomic_inc(&old_dentry->d_inode->i_count);
1406 yaffs_trace(YAFFS_TRACE_OS,
1407 "yaffs_link link count %d i_count %d",
1408 old_dentry->d_inode->i_nlink,
1409 atomic_read(&old_dentry->d_inode->i_count));
1410 }
1411
1412 yaffs_gross_unlock(dev);
1413
1414 if (link) {
1415 update_dir_time(dir);
1416 return 0;
1417 }
1418
1419 return -EPERM;
1420 }
1421
1422 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
1423 const char *symname)
1424 {
1425 struct yaffs_obj *obj;
1426 struct yaffs_dev *dev;
1427 uid_t uid = YCRED(current)->fsuid;
1428 gid_t gid =
1429 (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
1430
1431 yaffs_trace(YAFFS_TRACE_OS, "yaffs_symlink");
1432
1433 if (strnlen(dentry->d_name.name, YAFFS_MAX_NAME_LENGTH + 1) >
1434 YAFFS_MAX_NAME_LENGTH)
1435 return -ENAMETOOLONG;
1436
1437 if (strnlen(symname, YAFFS_MAX_ALIAS_LENGTH + 1) >
1438 YAFFS_MAX_ALIAS_LENGTH)
1439 return -ENAMETOOLONG;
1440
1441 dev = yaffs_inode_to_obj(dir)->my_dev;
1442 yaffs_gross_lock(dev);
1443 obj = yaffs_create_symlink(yaffs_inode_to_obj(dir), dentry->d_name.name,
1444 S_IFLNK | S_IRWXUGO, uid, gid, symname);
1445 yaffs_gross_unlock(dev);
1446
1447 if (obj) {
1448 struct inode *inode;
1449
1450 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
1451 d_instantiate(dentry, inode);
1452 update_dir_time(dir);
1453 yaffs_trace(YAFFS_TRACE_OS, "symlink created OK");
1454 return 0;
1455 } else {
1456 yaffs_trace(YAFFS_TRACE_OS, "symlink not created");
1457 }
1458
1459 return -ENOMEM;
1460 }
1461
1462 /*
1463 * The VFS layer already does all the dentry stuff for rename.
1464 *
1465 * NB: POSIX says you can rename an object over an old object of the same name
1466 */
1467 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
1468 struct inode *new_dir, struct dentry *new_dentry)
1469 {
1470 struct yaffs_dev *dev;
1471 int ret_val = YAFFS_FAIL;
1472 struct yaffs_obj *target;
1473
1474 yaffs_trace(YAFFS_TRACE_OS, "yaffs_rename");
1475 dev = yaffs_inode_to_obj(old_dir)->my_dev;
1476
1477 yaffs_gross_lock(dev);
1478
1479 /* Check if the target is an existing directory that is not empty. */
1480 target = yaffs_find_by_name(yaffs_inode_to_obj(new_dir),
1481 new_dentry->d_name.name);
1482
1483 if (target && target->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY &&
1484 !list_empty(&target->variant.dir_variant.children)) {
1485
1486 yaffs_trace(YAFFS_TRACE_OS, "target is non-empty dir");
1487
1488 ret_val = YAFFS_FAIL;
1489 } else {
1490 /* Now does unlinking internally using shadowing mechanism */
1491 yaffs_trace(YAFFS_TRACE_OS, "calling yaffs_rename_obj");
1492
1493 ret_val = yaffs_rename_obj(yaffs_inode_to_obj(old_dir),
1494 old_dentry->d_name.name,
1495 yaffs_inode_to_obj(new_dir),
1496 new_dentry->d_name.name);
1497 }
1498 yaffs_gross_unlock(dev);
1499
1500 if (ret_val == YAFFS_OK) {
1501 if (target)
1502 inode_dec_link_count(new_dentry->d_inode);
1503
1504 update_dir_time(old_dir);
1505 if (old_dir != new_dir)
1506 update_dir_time(new_dir);
1507 return 0;
1508 } else {
1509 return -ENOTEMPTY;
1510 }
1511 }
1512
1513
1514
1515
1516 static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
1517 {
1518 int ret_val;
1519
1520 struct yaffs_dev *dev;
1521 struct yaffs_obj *obj;
1522
1523 yaffs_trace(YAFFS_TRACE_OS, "yaffs_unlink %d:%s",
1524 (int)(dir->i_ino), dentry->d_name.name);
1525 obj = yaffs_inode_to_obj(dir);
1526 dev = obj->my_dev;
1527
1528 yaffs_gross_lock(dev);
1529
1530 ret_val = yaffs_unlinker(obj, dentry->d_name.name);
1531
1532 if (ret_val == YAFFS_OK) {
1533 inode_dec_link_count(dentry->d_inode);
1534 dir->i_version++;
1535 yaffs_gross_unlock(dev);
1536 update_dir_time(dir);
1537 return 0;
1538 }
1539 yaffs_gross_unlock(dev);
1540 return -ENOTEMPTY;
1541 }
1542
1543
1544
1545 static const struct inode_operations yaffs_dir_inode_operations = {
1546 .create = yaffs_create,
1547 .lookup = yaffs_lookup,
1548 .link = yaffs_link,
1549 .unlink = yaffs_unlink,
1550 .symlink = yaffs_symlink,
1551 .mkdir = yaffs_mkdir,
1552 .rmdir = yaffs_unlink,
1553 .mknod = yaffs_mknod,
1554 .rename = yaffs_rename,
1555 .setattr = yaffs_setattr,
1556 .setxattr = yaffs_setxattr,
1557 .getxattr = yaffs_getxattr,
1558 .listxattr = yaffs_listxattr,
1559 .removexattr = yaffs_removexattr,
1560 };
1561
1562 /*-----------------------------------------------------------------*/
1563 /* Directory search context allows us to unlock access to yaffs during
1564 * filldir without causing problems with the directory being modified.
1565 * This is similar to the tried and tested mechanism used in yaffs direct.
1566 *
1567 * A search context iterates along a doubly linked list of siblings in the
1568 * directory. If the iterating object is deleted then this would corrupt
1569 * the list iteration, likely causing a crash. The search context avoids
1570 * this by using the remove_obj_fn to move the search context to the
1571 * next object before the object is deleted.
1572 *
1573 * Many readdirs (and thus seach conexts) may be alive simulateously so
1574 * each struct yaffs_dev has a list of these.
1575 *
1576 * A seach context lives for the duration of a readdir.
1577 *
1578 * All these functions must be called while yaffs is locked.
1579 */
1580
1581 struct yaffs_search_context {
1582 struct yaffs_dev *dev;
1583 struct yaffs_obj *dir_obj;
1584 struct yaffs_obj *next_return;
1585 struct list_head others;
1586 };
1587
1588 /*
1589 * yaffs_new_search() creates a new search context, initialises it and
1590 * adds it to the device's search context list.
1591 *
1592 * Called at start of readdir.
1593 */
1594 static struct yaffs_search_context *yaffs_new_search(struct yaffs_obj *dir)
1595 {
1596 struct yaffs_dev *dev = dir->my_dev;
1597 struct yaffs_search_context *sc =
1598 kmalloc(sizeof(struct yaffs_search_context), GFP_NOFS);
1599 if (sc) {
1600 sc->dir_obj = dir;
1601 sc->dev = dev;
1602 if (list_empty(&sc->dir_obj->variant.dir_variant.children))
1603 sc->next_return = NULL;
1604 else
1605 sc->next_return =
1606 list_entry(dir->variant.dir_variant.children.next,
1607 struct yaffs_obj, siblings);
1608 INIT_LIST_HEAD(&sc->others);
1609 list_add(&sc->others, &(yaffs_dev_to_lc(dev)->search_contexts));
1610 }
1611 return sc;
1612 }
1613
1614 /*
1615 * yaffs_search_end() disposes of a search context and cleans up.
1616 */
1617 static void yaffs_search_end(struct yaffs_search_context *sc)
1618 {
1619 if (sc) {
1620 list_del(&sc->others);
1621 kfree(sc);
1622 }
1623 }
1624
1625 /*
1626 * yaffs_search_advance() moves a search context to the next object.
1627 * Called when the search iterates or when an object removal causes
1628 * the search context to be moved to the next object.
1629 */
1630 static void yaffs_search_advance(struct yaffs_search_context *sc)
1631 {
1632 if (!sc)
1633 return;
1634
1635 if (sc->next_return == NULL ||
1636 list_empty(&sc->dir_obj->variant.dir_variant.children))
1637 sc->next_return = NULL;
1638 else {
1639 struct list_head *next = sc->next_return->siblings.next;
1640
1641 if (next == &sc->dir_obj->variant.dir_variant.children)
1642 sc->next_return = NULL; /* end of list */
1643 else
1644 sc->next_return =
1645 list_entry(next, struct yaffs_obj, siblings);
1646 }
1647 }
1648
1649 /*
1650 * yaffs_remove_obj_callback() is called when an object is unlinked.
1651 * We check open search contexts and advance any which are currently
1652 * on the object being iterated.
1653 */
1654 static void yaffs_remove_obj_callback(struct yaffs_obj *obj)
1655 {
1656
1657 struct list_head *i;
1658 struct yaffs_search_context *sc;
1659 struct list_head *search_contexts =
1660 &(yaffs_dev_to_lc(obj->my_dev)->search_contexts);
1661
1662 /* Iterate through the directory search contexts.
1663 * If any are currently on the object being removed, then advance
1664 * the search context to the next object to prevent a hanging pointer.
1665 */
1666 list_for_each(i, search_contexts) {
1667 sc = list_entry(i, struct yaffs_search_context, others);
1668 if (sc->next_return == obj)
1669 yaffs_search_advance(sc);
1670 }
1671
1672 }
1673
1674
1675 /*-----------------------------------------------------------------*/
1676
1677 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
1678 {
1679 struct yaffs_obj *obj;
1680 struct yaffs_dev *dev;
1681 struct yaffs_search_context *sc;
1682 struct inode *inode = f->f_dentry->d_inode;
1683 unsigned long offset, curoffs;
1684 struct yaffs_obj *l;
1685 int ret_val = 0;
1686
1687 char name[YAFFS_MAX_NAME_LENGTH + 1];
1688
1689 obj = yaffs_dentry_to_obj(f->f_dentry);
1690 dev = obj->my_dev;
1691
1692 yaffs_gross_lock(dev);
1693
1694 yaffs_dev_to_lc(dev)->readdir_process = current;
1695
1696 offset = f->f_pos;
1697
1698 sc = yaffs_new_search(obj);
1699 if (!sc) {
1700 ret_val = -ENOMEM;
1701 goto out;
1702 }
1703
1704 yaffs_trace(YAFFS_TRACE_OS,
1705 "yaffs_readdir: starting at %d", (int)offset);
1706
1707 if (offset == 0) {
1708 yaffs_trace(YAFFS_TRACE_OS,
1709 "yaffs_readdir: entry . ino %d",
1710 (int)inode->i_ino);
1711 yaffs_gross_unlock(dev);
1712 if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0) {
1713 yaffs_gross_lock(dev);
1714 goto out;
1715 }
1716 yaffs_gross_lock(dev);
1717 offset++;
1718 f->f_pos++;
1719 }
1720 if (offset == 1) {
1721 yaffs_trace(YAFFS_TRACE_OS,
1722 "yaffs_readdir: entry .. ino %d",
1723 (int)f->f_dentry->d_parent->d_inode->i_ino);
1724 yaffs_gross_unlock(dev);
1725 if (filldir(dirent, "..", 2, offset,
1726 f->f_dentry->d_parent->d_inode->i_ino,
1727 DT_DIR) < 0) {
1728 yaffs_gross_lock(dev);
1729 goto out;
1730 }
1731 yaffs_gross_lock(dev);
1732 offset++;
1733 f->f_pos++;
1734 }
1735
1736 curoffs = 1;
1737
1738 /* If the directory has changed since the open or last call to
1739 readdir, rewind to after the 2 canned entries. */
1740 if (f->f_version != inode->i_version) {
1741 offset = 2;
1742 f->f_pos = offset;
1743 f->f_version = inode->i_version;
1744 }
1745
1746 while (sc->next_return) {
1747 curoffs++;
1748 l = sc->next_return;
1749 if (curoffs >= offset) {
1750 int this_inode = yaffs_get_obj_inode(l);
1751 int this_type = yaffs_get_obj_type(l);
1752
1753 yaffs_get_obj_name(l, name, YAFFS_MAX_NAME_LENGTH + 1);
1754 yaffs_trace(YAFFS_TRACE_OS,
1755 "yaffs_readdir: %s inode %d",
1756 name, yaffs_get_obj_inode(l));
1757
1758 yaffs_gross_unlock(dev);
1759
1760 if (filldir(dirent,
1761 name,
1762 strlen(name),
1763 offset, this_inode, this_type) < 0) {
1764 yaffs_gross_lock(dev);
1765 goto out;
1766 }
1767
1768 yaffs_gross_lock(dev);
1769
1770 offset++;
1771 f->f_pos++;
1772 }
1773 yaffs_search_advance(sc);
1774 }
1775
1776 out:
1777 yaffs_search_end(sc);
1778 yaffs_dev_to_lc(dev)->readdir_process = NULL;
1779 yaffs_gross_unlock(dev);
1780
1781 return ret_val;
1782 }
1783
1784 static const struct file_operations yaffs_dir_operations = {
1785 .read = generic_read_dir,
1786 .readdir = yaffs_readdir,
1787 .fsync = yaffs_sync_object,
1788 .llseek = generic_file_llseek,
1789 };
1790
1791 static void yaffs_fill_inode_from_obj(struct inode *inode,
1792 struct yaffs_obj *obj)
1793 {
1794 if (inode && obj) {
1795
1796 /* Check mode against the variant type and attempt to repair if broken. */
1797 u32 mode = obj->yst_mode;
1798 switch (obj->variant_type) {
1799 case YAFFS_OBJECT_TYPE_FILE:
1800 if (!S_ISREG(mode)) {
1801 obj->yst_mode &= ~S_IFMT;
1802 obj->yst_mode |= S_IFREG;
1803 }
1804
1805 break;
1806 case YAFFS_OBJECT_TYPE_SYMLINK:
1807 if (!S_ISLNK(mode)) {
1808 obj->yst_mode &= ~S_IFMT;
1809 obj->yst_mode |= S_IFLNK;
1810 }
1811
1812 break;
1813 case YAFFS_OBJECT_TYPE_DIRECTORY:
1814 if (!S_ISDIR(mode)) {
1815 obj->yst_mode &= ~S_IFMT;
1816 obj->yst_mode |= S_IFDIR;
1817 }
1818
1819 break;
1820 case YAFFS_OBJECT_TYPE_UNKNOWN:
1821 case YAFFS_OBJECT_TYPE_HARDLINK:
1822 case YAFFS_OBJECT_TYPE_SPECIAL:
1823 default:
1824 /* TODO? */
1825 break;
1826 }
1827
1828 inode->i_flags |= S_NOATIME;
1829
1830 inode->i_ino = obj->obj_id;
1831 inode->i_mode = obj->yst_mode;
1832 inode->i_uid = obj->yst_uid;
1833 inode->i_gid = obj->yst_gid;
1834 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
1835 inode->i_blksize = inode->i_sb->s_blocksize;
1836 #endif
1837 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1838
1839 inode->i_rdev = old_decode_dev(obj->yst_rdev);
1840 inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
1841 inode->i_atime.tv_nsec = 0;
1842 inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
1843 inode->i_mtime.tv_nsec = 0;
1844 inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
1845 inode->i_ctime.tv_nsec = 0;
1846 #else
1847 inode->i_rdev = obj->yst_rdev;
1848 inode->i_atime = obj->yst_atime;
1849 inode->i_mtime = obj->yst_mtime;
1850 inode->i_ctime = obj->yst_ctime;
1851 #endif
1852 inode->i_size = yaffs_get_obj_length(obj);
1853 inode->i_blocks = (inode->i_size + 511) >> 9;
1854
1855 set_nlink(inode, yaffs_get_obj_link_count(obj));
1856
1857 yaffs_trace(YAFFS_TRACE_OS,
1858 "yaffs_fill_inode mode %x uid %d gid %d size %lld count %d",
1859 inode->i_mode, inode->i_uid, inode->i_gid,
1860 inode->i_size, atomic_read(&inode->i_count));
1861
1862 switch (obj->yst_mode & S_IFMT) {
1863 default: /* fifo, device or socket */
1864 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1865 init_special_inode(inode, obj->yst_mode,
1866 old_decode_dev(obj->yst_rdev));
1867 #else
1868 init_special_inode(inode, obj->yst_mode,
1869 (dev_t) (obj->yst_rdev));
1870 #endif
1871 break;
1872 case S_IFREG: /* file */
1873 inode->i_op = &yaffs_file_inode_operations;
1874 inode->i_fop = &yaffs_file_operations;
1875 inode->i_mapping->a_ops =
1876 &yaffs_file_address_operations;
1877 break;
1878 case S_IFDIR: /* directory */
1879 inode->i_op = &yaffs_dir_inode_operations;
1880 inode->i_fop = &yaffs_dir_operations;
1881 break;
1882 case S_IFLNK: /* symlink */
1883 inode->i_op = &yaffs_symlink_inode_operations;
1884 break;
1885 }
1886
1887 yaffs_inode_to_obj_lv(inode) = obj;
1888
1889 obj->my_inode = inode;
1890
1891 } else {
1892 yaffs_trace(YAFFS_TRACE_OS,
1893 "yaffs_fill_inode invalid parameters");
1894 }
1895
1896 }
1897
1898
1899
1900 /*
1901 * yaffs background thread functions .
1902 * yaffs_bg_thread_fn() the thread function
1903 * yaffs_bg_start() launches the background thread.
1904 * yaffs_bg_stop() cleans up the background thread.
1905 *
1906 * NB:
1907 * The thread should only run after the yaffs is initialised
1908 * The thread should be stopped before yaffs is unmounted.
1909 * The thread should not do any writing while the fs is in read only.
1910 */
1911
1912 static unsigned yaffs_bg_gc_urgency(struct yaffs_dev *dev)
1913 {
1914 unsigned erased_chunks =
1915 dev->n_erased_blocks * dev->param.chunks_per_block;
1916 struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
1917 unsigned scattered = 0; /* Free chunks not in an erased block */
1918
1919 if (erased_chunks < dev->n_free_chunks)
1920 scattered = (dev->n_free_chunks - erased_chunks);
1921
1922 if (!context->bg_running)
1923 return 0;
1924 else if (scattered < (dev->param.chunks_per_block * 2))
1925 return 0;
1926 else if (erased_chunks > dev->n_free_chunks / 2)
1927 return 0;
1928 else if (erased_chunks > dev->n_free_chunks / 4)
1929 return 1;
1930 else
1931 return 2;
1932 }
1933
1934 #ifdef YAFFS_COMPILE_BACKGROUND
1935
1936 void yaffs_background_waker(unsigned long data)
1937 {
1938 wake_up_process((struct task_struct *)data);
1939 }
1940
1941 static int yaffs_bg_thread_fn(void *data)
1942 {
1943 struct yaffs_dev *dev = (struct yaffs_dev *)data;
1944 struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
1945 unsigned long now = jiffies;
1946 unsigned long next_dir_update = now;
1947 unsigned long next_gc = now;
1948 unsigned long expires;
1949 unsigned int urgency;
1950
1951 int gc_result;
1952 struct timer_list timer;
1953
1954 yaffs_trace(YAFFS_TRACE_BACKGROUND,
1955 "yaffs_background starting for dev %p", (void *)dev);
1956
1957 #ifdef YAFFS_COMPILE_FREEZER
1958 set_freezable();
1959 #endif
1960 while (context->bg_running) {
1961 yaffs_trace(YAFFS_TRACE_BACKGROUND, "yaffs_background");
1962
1963 if (kthread_should_stop())
1964 break;
1965
1966 #ifdef YAFFS_COMPILE_FREEZER
1967 if (try_to_freeze())
1968 continue;
1969 #endif
1970 yaffs_gross_lock(dev);
1971
1972 now = jiffies;
1973
1974 if (time_after(now, next_dir_update) && yaffs_bg_enable) {
1975 yaffs_update_dirty_dirs(dev);
1976 next_dir_update = now + HZ;
1977 }
1978
1979 if (time_after(now, next_gc) && yaffs_bg_enable) {
1980 if (!dev->is_checkpointed) {
1981 urgency = yaffs_bg_gc_urgency(dev);
1982 gc_result = yaffs_bg_gc(dev, urgency);
1983 if (urgency > 1)
1984 next_gc = now + HZ / 20 + 1;
1985 else if (urgency > 0)
1986 next_gc = now + HZ / 10 + 1;
1987 else
1988 next_gc = now + HZ * 2;
1989 } else {
1990 /*
1991 * gc not running so set to next_dir_update
1992 * to cut down on wake ups
1993 */
1994 next_gc = next_dir_update;
1995 }
1996 }
1997 yaffs_gross_unlock(dev);
1998 #if 1
1999 expires = next_dir_update;
2000 if (time_before(next_gc, expires))
2001 expires = next_gc;
2002 if (time_before(expires, now))
2003 expires = now + HZ;
2004
2005 Y_INIT_TIMER(&timer);
2006 timer.expires = expires + 1;
2007 timer.data = (unsigned long)current;
2008 timer.function = yaffs_background_waker;
2009
2010 set_current_state(TASK_INTERRUPTIBLE);
2011 add_timer(&timer);
2012 schedule();
2013 del_timer_sync(&timer);
2014 #else
2015 msleep(10);
2016 #endif
2017 }
2018
2019 return 0;
2020 }
2021
2022 static int yaffs_bg_start(struct yaffs_dev *dev)
2023 {
2024 int retval = 0;
2025 struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
2026
2027 if (dev->read_only)
2028 return -1;
2029
2030 context->bg_running = 1;
2031
2032 context->bg_thread = kthread_run(yaffs_bg_thread_fn,
2033 (void *)dev, "yaffs-bg-%d",
2034 context->mount_id);
2035
2036 if (IS_ERR(context->bg_thread)) {
2037 retval = PTR_ERR(context->bg_thread);
2038 context->bg_thread = NULL;
2039 context->bg_running = 0;
2040 }
2041 return retval;
2042 }
2043
2044 static void yaffs_bg_stop(struct yaffs_dev *dev)
2045 {
2046 struct yaffs_linux_context *ctxt = yaffs_dev_to_lc(dev);
2047
2048 ctxt->bg_running = 0;
2049
2050 if (ctxt->bg_thread) {
2051 kthread_stop(ctxt->bg_thread);
2052 ctxt->bg_thread = NULL;
2053 }
2054 }
2055 #else
2056 static int yaffs_bg_thread_fn(void *data)
2057 {
2058 return 0;
2059 }
2060
2061 static int yaffs_bg_start(struct yaffs_dev *dev)
2062 {
2063 return 0;
2064 }
2065
2066 static void yaffs_bg_stop(struct yaffs_dev *dev)
2067 {
2068 }
2069 #endif
2070
2071
2072 static void yaffs_flush_inodes(struct super_block *sb)
2073 {
2074 struct inode *iptr;
2075 struct yaffs_obj *obj;
2076
2077 list_for_each_entry(iptr, &sb->s_inodes, i_sb_list) {
2078 obj = yaffs_inode_to_obj(iptr);
2079 if (obj) {
2080 yaffs_trace(YAFFS_TRACE_OS,
2081 "flushing obj %d",
2082 obj->obj_id);
2083 yaffs_flush_file(obj, 1, 0);
2084 }
2085 }
2086 }
2087
2088 static void yaffs_flush_super(struct super_block *sb, int do_checkpoint)
2089 {
2090 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
2091 if (!dev)
2092 return;
2093
2094 yaffs_flush_inodes(sb);
2095 yaffs_update_dirty_dirs(dev);
2096 yaffs_flush_whole_cache(dev);
2097 if (do_checkpoint)
2098 yaffs_checkpoint_save(dev);
2099 }
2100
2101 static LIST_HEAD(yaffs_context_list);
2102 struct mutex yaffs_context_lock;
2103
2104 static void yaffs_put_super(struct super_block *sb)
2105 {
2106 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
2107 struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
2108
2109 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_ALWAYS,
2110 "yaffs_put_super");
2111
2112 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
2113 "Shutting down yaffs background thread");
2114 yaffs_bg_stop(dev);
2115 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
2116 "yaffs background thread shut down");
2117
2118 yaffs_gross_lock(dev);
2119
2120 yaffs_flush_super(sb, 1);
2121
2122 yaffs_deinitialise(dev);
2123
2124 yaffs_gross_unlock(dev);
2125
2126 mutex_lock(&yaffs_context_lock);
2127 list_del_init(&(yaffs_dev_to_lc(dev)->context_list));
2128 mutex_unlock(&yaffs_context_lock);
2129
2130 if (yaffs_dev_to_lc(dev)->spare_buffer) {
2131 kfree(yaffs_dev_to_lc(dev)->spare_buffer);
2132 yaffs_dev_to_lc(dev)->spare_buffer = NULL;
2133 }
2134
2135 kfree(dev);
2136
2137 yaffs_put_mtd_device(mtd);
2138
2139 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_ALWAYS,
2140 "yaffs_put_super done");
2141 }
2142
2143
2144 static unsigned yaffs_gc_control_callback(struct yaffs_dev *dev)
2145 {
2146 return yaffs_gc_control;
2147 }
2148
2149
2150 #ifdef YAFFS_COMPILE_EXPORTFS
2151
2152 static struct inode *yaffs2_nfs_get_inode(struct super_block *sb, uint64_t ino,
2153 uint32_t generation)
2154 {
2155 return Y_IGET(sb, ino);
2156 }
2157
2158 static struct dentry *yaffs2_fh_to_dentry(struct super_block *sb,
2159 struct fid *fid, int fh_len,
2160 int fh_type)
2161 {
2162 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
2163 yaffs2_nfs_get_inode);
2164 }
2165
2166 static struct dentry *yaffs2_fh_to_parent(struct super_block *sb,
2167 struct fid *fid, int fh_len,
2168 int fh_type)
2169 {
2170 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
2171 yaffs2_nfs_get_inode);
2172 }
2173
2174 struct dentry *yaffs2_get_parent(struct dentry *dentry)
2175 {
2176
2177 struct super_block *sb = dentry->d_inode->i_sb;
2178 struct dentry *parent = ERR_PTR(-ENOENT);
2179 struct inode *inode;
2180 unsigned long parent_ino;
2181 struct yaffs_obj *d_obj;
2182 struct yaffs_obj *parent_obj;
2183
2184 d_obj = yaffs_inode_to_obj(dentry->d_inode);
2185
2186 if (d_obj) {
2187 parent_obj = d_obj->parent;
2188 if (parent_obj) {
2189 parent_ino = yaffs_get_obj_inode(parent_obj);
2190 inode = Y_IGET(sb, parent_ino);
2191
2192 if (IS_ERR(inode)) {
2193 parent = ERR_CAST(inode);
2194 } else {
2195 parent = d_obtain_alias(inode);
2196 if (!IS_ERR(parent)) {
2197 parent = ERR_PTR(-ENOMEM);
2198 iput(inode);
2199 }
2200 }
2201 }
2202 }
2203
2204 return parent;
2205 }
2206
2207 /* Just declare a zero structure as a NULL value implies
2208 * using the default functions of exportfs.
2209 */
2210
2211 static struct export_operations yaffs_export_ops = {
2212 .fh_to_dentry = yaffs2_fh_to_dentry,
2213 .fh_to_parent = yaffs2_fh_to_parent,
2214 .get_parent = yaffs2_get_parent,
2215 };
2216
2217 #endif
2218
2219 static void yaffs_unstitch_obj(struct inode *inode, struct yaffs_obj *obj)
2220 {
2221 /* Clear the association between the inode and
2222 * the struct yaffs_obj.
2223 */
2224 obj->my_inode = NULL;
2225 yaffs_inode_to_obj_lv(inode) = NULL;
2226
2227 /* If the object freeing was deferred, then the real
2228 * free happens now.
2229 * This should fix the inode inconsistency problem.
2230 */
2231 yaffs_handle_defered_free(obj);
2232 }
2233
2234 #ifdef YAFFS_HAS_EVICT_INODE
2235 /* yaffs_evict_inode combines into one operation what was previously done in
2236 * yaffs_clear_inode() and yaffs_delete_inode()
2237 *
2238 */
2239 static void yaffs_evict_inode(struct inode *inode)
2240 {
2241 struct yaffs_obj *obj;
2242 struct yaffs_dev *dev;
2243 int deleteme = 0;
2244
2245 obj = yaffs_inode_to_obj(inode);
2246
2247 yaffs_trace(YAFFS_TRACE_OS,
2248 "yaffs_evict_inode: ino %d, count %d %s",
2249 (int)inode->i_ino, atomic_read(&inode->i_count),
2250 obj ? "object exists" : "null object");
2251
2252 if (!inode->i_nlink && !is_bad_inode(inode))
2253 deleteme = 1;
2254 truncate_inode_pages(&inode->i_data, 0);
2255 Y_CLEAR_INODE(inode);
2256
2257 if (deleteme && obj) {
2258 dev = obj->my_dev;
2259 yaffs_gross_lock(dev);
2260 yaffs_del_obj(obj);
2261 yaffs_gross_unlock(dev);
2262 }
2263 if (obj) {
2264 dev = obj->my_dev;
2265 yaffs_gross_lock(dev);
2266 yaffs_unstitch_obj(inode, obj);
2267 yaffs_gross_unlock(dev);
2268 }
2269 }
2270 #else
2271
2272 /* clear is called to tell the fs to release any per-inode data it holds.
2273 * The object might still exist on disk and is just being thrown out of the cache
2274 * or else the object has actually been deleted and we're being called via
2275 * the chain
2276 * yaffs_delete_inode() -> clear_inode()->yaffs_clear_inode()
2277 */
2278
2279 static void yaffs_clear_inode(struct inode *inode)
2280 {
2281 struct yaffs_obj *obj;
2282 struct yaffs_dev *dev;
2283
2284 obj = yaffs_inode_to_obj(inode);
2285
2286 yaffs_trace(YAFFS_TRACE_OS,
2287 "yaffs_clear_inode: ino %d, count %d %s",
2288 (int)inode->i_ino, atomic_read(&inode->i_count),
2289 obj ? "object exists" : "null object");
2290
2291 if (obj) {
2292 dev = obj->my_dev;
2293 yaffs_gross_lock(dev);
2294 yaffs_unstitch_obj(inode, obj);
2295 yaffs_gross_unlock(dev);
2296 }
2297
2298 }
2299
2300 /* delete is called when the link count is zero and the inode
2301 * is put (ie. nobody wants to know about it anymore, time to
2302 * delete the file).
2303 * NB Must call clear_inode()
2304 */
2305 static void yaffs_delete_inode(struct inode *inode)
2306 {
2307 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
2308 struct yaffs_dev *dev;
2309
2310 yaffs_trace(YAFFS_TRACE_OS,
2311 "yaffs_delete_inode: ino %d, count %d %s",
2312 (int)inode->i_ino, atomic_read(&inode->i_count),
2313 obj ? "object exists" : "null object");
2314
2315 if (obj) {
2316 dev = obj->my_dev;
2317 yaffs_gross_lock(dev);
2318 yaffs_del_obj(obj);
2319 yaffs_gross_unlock(dev);
2320 }
2321 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
2322 truncate_inode_pages(&inode->i_data, 0);
2323 #endif
2324 clear_inode(inode);
2325 }
2326 #endif
2327
2328
2329
2330
2331 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2332 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
2333 {
2334 struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
2335 struct super_block *sb = dentry->d_sb;
2336 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2337 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
2338 {
2339 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
2340 #else
2341 static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
2342 {
2343 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
2344 #endif
2345
2346 yaffs_trace(YAFFS_TRACE_OS, "yaffs_statfs");
2347
2348 yaffs_gross_lock(dev);
2349
2350 buf->f_type = YAFFS_MAGIC;
2351 buf->f_bsize = sb->s_blocksize;
2352 buf->f_namelen = 255;
2353
2354 if (dev->data_bytes_per_chunk & (dev->data_bytes_per_chunk - 1)) {
2355 /* Do this if chunk size is not a power of 2 */
2356
2357 uint64_t bytes_in_dev;
2358 uint64_t bytes_free;
2359
2360 bytes_in_dev =
2361 ((uint64_t)
2362 ((dev->param.end_block - dev->param.start_block +
2363 1))) * ((uint64_t) (dev->param.chunks_per_block *
2364 dev->data_bytes_per_chunk));
2365
2366 do_div(bytes_in_dev, sb->s_blocksize); /* bytes_in_dev becomes the number of blocks */
2367 buf->f_blocks = bytes_in_dev;
2368
2369 bytes_free = ((uint64_t) (yaffs_get_n_free_chunks(dev))) *
2370 ((uint64_t) (dev->data_bytes_per_chunk));
2371
2372 do_div(bytes_free, sb->s_blocksize);
2373
2374 buf->f_bfree = bytes_free;
2375
2376 } else if (sb->s_blocksize > dev->data_bytes_per_chunk) {
2377
2378 buf->f_blocks =
2379 (dev->param.end_block - dev->param.start_block + 1) *
2380 dev->param.chunks_per_block /
2381 (sb->s_blocksize / dev->data_bytes_per_chunk);
2382 buf->f_bfree =
2383 yaffs_get_n_free_chunks(dev) /
2384 (sb->s_blocksize / dev->data_bytes_per_chunk);
2385 } else {
2386 buf->f_blocks =
2387 (dev->param.end_block - dev->param.start_block + 1) *
2388 dev->param.chunks_per_block *
2389 (dev->data_bytes_per_chunk / sb->s_blocksize);
2390
2391 buf->f_bfree =
2392 yaffs_get_n_free_chunks(dev) *
2393 (dev->data_bytes_per_chunk / sb->s_blocksize);
2394 }
2395
2396 buf->f_files = 0;
2397 buf->f_ffree = 0;
2398 buf->f_bavail = buf->f_bfree;
2399
2400 yaffs_gross_unlock(dev);
2401 return 0;
2402 }
2403
2404
2405
2406 static int yaffs_do_sync_fs(struct super_block *sb, int request_checkpoint)
2407 {
2408
2409 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
2410 unsigned int oneshot_checkpoint = (yaffs_auto_checkpoint & 4);
2411 unsigned gc_urgent = yaffs_bg_gc_urgency(dev);
2412 int do_checkpoint;
2413 int dirty = yaffs_check_super_dirty(dev);
2414
2415 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
2416 "yaffs_do_sync_fs: gc-urgency %d %s %s%s",
2417 gc_urgent,
2418 dirty ? "dirty" : "clean",
2419 request_checkpoint ? "checkpoint requested" : "no checkpoint",
2420 oneshot_checkpoint ? " one-shot" : "");
2421
2422 yaffs_gross_lock(dev);
2423 do_checkpoint = ((request_checkpoint && !gc_urgent) ||
2424 oneshot_checkpoint) && !dev->is_checkpointed;
2425
2426 if (dirty || do_checkpoint) {
2427 yaffs_flush_super(sb, !dev->is_checkpointed && do_checkpoint);
2428 yaffs_clear_super_dirty(dev);
2429 if (oneshot_checkpoint)
2430 yaffs_auto_checkpoint &= ~4;
2431 }
2432 yaffs_gross_unlock(dev);
2433
2434 return 0;
2435 }
2436
2437
2438 #ifdef YAFFS_HAS_WRITE_SUPER
2439 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2440 static void yaffs_write_super(struct super_block *sb)
2441 #else
2442 static int yaffs_write_super(struct super_block *sb)
2443 #endif
2444 {
2445 unsigned request_checkpoint = (yaffs_auto_checkpoint >= 2);
2446
2447 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
2448 "yaffs_write_super %s",
2449 request_checkpoint ? " checkpt" : "");
2450
2451 yaffs_do_sync_fs(sb, request_checkpoint);
2452
2453 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 18))
2454 return 0;
2455 #endif
2456 }
2457 #endif
2458
2459 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2460 static int yaffs_sync_fs(struct super_block *sb, int wait)
2461 #else
2462 static int yaffs_sync_fs(struct super_block *sb)
2463 #endif
2464 {
2465 unsigned request_checkpoint = (yaffs_auto_checkpoint >= 1);
2466
2467 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
2468 "yaffs_sync_fs%s", request_checkpoint ? " checkpt" : "");
2469
2470 yaffs_do_sync_fs(sb, request_checkpoint);
2471
2472 return 0;
2473 }
2474
2475
2476
2477 static const struct super_operations yaffs_super_ops = {
2478 .statfs = yaffs_statfs,
2479
2480 #ifndef YAFFS_USE_OWN_IGET
2481 .read_inode = yaffs_read_inode,
2482 #endif
2483 #ifdef YAFFS_HAS_PUT_INODE
2484 .put_inode = yaffs_put_inode,
2485 #endif
2486 .put_super = yaffs_put_super,
2487 #ifdef YAFFS_HAS_EVICT_INODE
2488 .evict_inode = yaffs_evict_inode,
2489 #else
2490 .delete_inode = yaffs_delete_inode,
2491 .clear_inode = yaffs_clear_inode,
2492 #endif
2493 .sync_fs = yaffs_sync_fs,
2494 #ifdef YAFFS_HAS_WRITE_SUPER
2495 .write_super = yaffs_write_super,
2496 #endif
2497 };
2498
2499 struct yaffs_options {
2500 int inband_tags;
2501 int skip_checkpoint_read;
2502 int skip_checkpoint_write;
2503 int no_cache;
2504 int tags_ecc_on;
2505 int tags_ecc_overridden;
2506 int lazy_loading_enabled;
2507 int lazy_loading_overridden;
2508 int empty_lost_and_found;
2509 int empty_lost_and_found_overridden;
2510 int disable_summary;
2511 };
2512
2513 #define MAX_OPT_LEN 30
2514 static int yaffs_parse_options(struct yaffs_options *options,
2515 const char *options_str)
2516 {
2517 char cur_opt[MAX_OPT_LEN + 1];
2518 int p;
2519 int error = 0;
2520
2521 /* Parse through the options which is a comma seperated list */
2522
2523 while (options_str && *options_str && !error) {
2524 memset(cur_opt, 0, MAX_OPT_LEN + 1);
2525 p = 0;
2526
2527 while (*options_str == ',')
2528 options_str++;
2529
2530 while (*options_str && *options_str != ',') {
2531 if (p < MAX_OPT_LEN) {
2532 cur_opt[p] = *options_str;
2533 p++;
2534 }
2535 options_str++;
2536 }
2537
2538 if (!strcmp(cur_opt, "inband-tags")) {
2539 options->inband_tags = 1;
2540 } else if (!strcmp(cur_opt, "tags-ecc-off")) {
2541 options->tags_ecc_on = 0;
2542 options->tags_ecc_overridden = 1;
2543 } else if (!strcmp(cur_opt, "tags-ecc-on")) {
2544 options->tags_ecc_on = 1;
2545 options->tags_ecc_overridden = 1;
2546 } else if (!strcmp(cur_opt, "lazy-loading-off")) {
2547 options->lazy_loading_enabled = 0;
2548 options->lazy_loading_overridden = 1;
2549 } else if (!strcmp(cur_opt, "lazy-loading-on")) {
2550 options->lazy_loading_enabled = 1;
2551 options->lazy_loading_overridden = 1;
2552 } else if (!strcmp(cur_opt, "disable-summary")) {
2553 options->disable_summary = 1;
2554 } else if (!strcmp(cur_opt, "empty-lost-and-found-off")) {
2555 options->empty_lost_and_found = 0;
2556 options->empty_lost_and_found_overridden = 1;
2557 } else if (!strcmp(cur_opt, "empty-lost-and-found-on")) {
2558 options->empty_lost_and_found = 1;
2559 options->empty_lost_and_found_overridden = 1;
2560 } else if (!strcmp(cur_opt, "no-cache")) {
2561 options->no_cache = 1;
2562 } else if (!strcmp(cur_opt, "no-checkpoint-read")) {
2563 options->skip_checkpoint_read = 1;
2564 } else if (!strcmp(cur_opt, "no-checkpoint-write")) {
2565 options->skip_checkpoint_write = 1;
2566 } else if (!strcmp(cur_opt, "no-checkpoint")) {
2567 options->skip_checkpoint_read = 1;
2568 options->skip_checkpoint_write = 1;
2569 } else {
2570 printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n",
2571 cur_opt);
2572 error = 1;
2573 }
2574 }
2575
2576 return error;
2577 }
2578
2579
2580 static struct dentry *yaffs_make_root(struct inode *inode)
2581 {
2582 #if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0))
2583 struct dentry *root = d_alloc_root(inode);
2584
2585 if (!root)
2586 iput(inode);
2587
2588 return root;
2589 #else
2590 return d_make_root(inode);
2591 #endif
2592 }
2593
2594
2595
2596
2597 static struct super_block *yaffs_internal_read_super(int yaffs_version,
2598 struct super_block *sb,
2599 void *data, int silent)
2600 {
2601 int n_blocks;
2602 struct inode *inode = NULL;
2603 struct dentry *root;
2604 struct yaffs_dev *dev = 0;
2605 char devname_buf[BDEVNAME_SIZE + 1];
2606 struct mtd_info *mtd;
2607 int err;
2608 char *data_str = (char *)data;
2609 struct yaffs_linux_context *context = NULL;
2610 struct yaffs_param *param;
2611
2612 int read_only = 0;
2613 int inband_tags = 0;
2614
2615 struct yaffs_options options;
2616
2617 unsigned mount_id;
2618 int found;
2619 struct yaffs_linux_context *context_iterator;
2620 struct list_head *l;
2621
2622 if (!sb) {
2623 printk(KERN_INFO "yaffs: sb is NULL\n");
2624 return NULL;
2625 }
2626
2627 sb->s_magic = YAFFS_MAGIC;
2628 sb->s_op = &yaffs_super_ops;
2629 sb->s_flags |= MS_NOATIME;
2630
2631 read_only = ((sb->s_flags & MS_RDONLY) != 0);
2632
2633 #ifdef YAFFS_COMPILE_EXPORTFS
2634 sb->s_export_op = &yaffs_export_ops;
2635 #endif
2636
2637 if (!sb->s_dev)
2638 printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
2639 else if (!yaffs_devname(sb, devname_buf))
2640 printk(KERN_INFO "yaffs: devname is NULL\n");
2641 else
2642 printk(KERN_INFO "yaffs: dev is %d name is \"%s\" %s\n",
2643 sb->s_dev,
2644 yaffs_devname(sb, devname_buf), read_only ? "ro" : "rw");
2645
2646 if (!data_str)
2647 data_str = "";
2648
2649 printk(KERN_INFO "yaffs: passed flags \"%s\"\n", data_str);
2650
2651 memset(&options, 0, sizeof(options));
2652
2653 if (yaffs_parse_options(&options, data_str)) {
2654 /* Option parsing failed */
2655 return NULL;
2656 }
2657
2658 sb->s_blocksize = PAGE_CACHE_SIZE;
2659 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
2660
2661 yaffs_trace(YAFFS_TRACE_OS,
2662 "yaffs_read_super: Using yaffs%d", yaffs_version);
2663 yaffs_trace(YAFFS_TRACE_OS,
2664 "yaffs_read_super: block size %d", (int)(sb->s_blocksize));
2665
2666 yaffs_trace(YAFFS_TRACE_ALWAYS,
2667 "yaffs: Attempting MTD mount of %u.%u,\"%s\"",
2668 MAJOR(sb->s_dev), MINOR(sb->s_dev),
2669 yaffs_devname(sb, devname_buf));
2670
2671 /* Get the device */
2672 mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
2673 if (!mtd) {
2674 yaffs_trace(YAFFS_TRACE_ALWAYS,
2675 "yaffs: MTD device %u either not valid or unavailable",
2676 MINOR(sb->s_dev));
2677 return NULL;
2678 }
2679
2680 if (yaffs_auto_select && yaffs_version == 1 && WRITE_SIZE(mtd) >= 2048) {
2681 yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs2");
2682 yaffs_version = 2;
2683 }
2684
2685 /* Added NCB 26/5/2006 for completeness */
2686 if (yaffs_version == 2 && !options.inband_tags
2687 && WRITE_SIZE(mtd) == 512) {
2688 yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs1");
2689 yaffs_version = 1;
2690 }
2691
2692 if (mtd->oobavail < sizeof(struct yaffs_packed_tags2) ||
2693 options.inband_tags)
2694 inband_tags = 1;
2695
2696 if(yaffs_verify_mtd(mtd, yaffs_version, inband_tags) < 0)
2697 return NULL;
2698
2699 /* OK, so if we got here, we have an MTD that's NAND and looks
2700 * like it has the right capabilities
2701 * Set the struct yaffs_dev up for mtd
2702 */
2703
2704 if (!read_only && !(mtd->flags & MTD_WRITEABLE)) {
2705 read_only = 1;
2706 printk(KERN_INFO
2707 "yaffs: mtd is read only, setting superblock read only\n"
2708 );
2709 sb->s_flags |= MS_RDONLY;
2710 }
2711
2712 dev = kmalloc(sizeof(struct yaffs_dev), GFP_KERNEL);
2713 context = kmalloc(sizeof(struct yaffs_linux_context), GFP_KERNEL);
2714
2715 if (!dev || !context) {
2716 if (dev)
2717 kfree(dev);
2718 if (context)
2719 kfree(context);
2720 dev = NULL;
2721 context = NULL;
2722 }
2723
2724 if (!dev) {
2725 /* Deep shit could not allocate device structure */
2726 yaffs_trace(YAFFS_TRACE_ALWAYS,
2727 "yaffs_read_super: Failed trying to allocate struct yaffs_dev."
2728 );
2729 return NULL;
2730 }
2731 memset(dev, 0, sizeof(struct yaffs_dev));
2732 param = &(dev->param);
2733
2734 memset(context, 0, sizeof(struct yaffs_linux_context));
2735 dev->os_context = context;
2736 INIT_LIST_HEAD(&(context->context_list));
2737 context->dev = dev;
2738 context->super = sb;
2739
2740 dev->read_only = read_only;
2741
2742 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2743 sb->s_fs_info = dev;
2744 #else
2745 sb->u.generic_sbp = dev;
2746 #endif
2747
2748
2749 dev->driver_context = mtd;
2750 param->name = mtd->name;
2751
2752 /* Set up the memory size parameters.... */
2753
2754
2755 param->n_reserved_blocks = 5;
2756 param->n_caches = (options.no_cache) ? 0 : 10;
2757 param->inband_tags = inband_tags;
2758
2759 param->enable_xattr = 1;
2760 if (options.lazy_loading_overridden)
2761 param->disable_lazy_load = !options.lazy_loading_enabled;
2762
2763 param->defered_dir_update = 1;
2764
2765 if (options.tags_ecc_overridden)
2766 param->no_tags_ecc = !options.tags_ecc_on;
2767
2768 param->empty_lost_n_found = 1;
2769 param->refresh_period = 500;
2770 param->disable_summary = options.disable_summary;
2771
2772
2773 #ifdef CONFIG_YAFFS_DISABLE_BAD_BLOCK_MARKING
2774 param->disable_bad_block_marking = 1;
2775 #endif
2776 if (options.empty_lost_and_found_overridden)
2777 param->empty_lost_n_found = options.empty_lost_and_found;
2778
2779 /* ... and the functions. */
2780 if (yaffs_version == 2) {
2781 param->is_yaffs2 = 1;
2782 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2783 param->total_bytes_per_chunk = mtd->writesize;
2784 param->chunks_per_block = mtd->erasesize / mtd->writesize;
2785 #else
2786 param->total_bytes_per_chunk = mtd->oobblock;
2787 param->chunks_per_block = mtd->erasesize / mtd->oobblock;
2788 #endif
2789 n_blocks = YCALCBLOCKS(mtd->size, mtd->erasesize);
2790
2791 param->start_block = 0;
2792 param->end_block = n_blocks - 1;
2793 } else {
2794 param->is_yaffs2 = 0;
2795 n_blocks = YCALCBLOCKS(mtd->size,
2796 YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
2797
2798 param->chunks_per_block = YAFFS_CHUNKS_PER_BLOCK;
2799 param->total_bytes_per_chunk = YAFFS_BYTES_PER_CHUNK;
2800 }
2801
2802 param->start_block = 0;
2803 param->end_block = n_blocks - 1;
2804
2805 yaffs_mtd_drv_install(dev);
2806
2807 param->sb_dirty_fn = yaffs_set_super_dirty;
2808 param->gc_control_fn = yaffs_gc_control_callback;
2809
2810 yaffs_dev_to_lc(dev)->super = sb;
2811
2812 param->use_nand_ecc = 1;
2813
2814 param->skip_checkpt_rd = options.skip_checkpoint_read;
2815 param->skip_checkpt_wr = options.skip_checkpoint_write;
2816
2817 mutex_lock(&yaffs_context_lock);
2818 /* Get a mount id */
2819 found = 0;
2820 for (mount_id = 0; !found; mount_id++) {
2821 found = 1;
2822 list_for_each(l, &yaffs_context_list) {
2823 context_iterator =
2824 list_entry(l, struct yaffs_linux_context,
2825 context_list);
2826 if (context_iterator->mount_id == mount_id)
2827 found = 0;
2828 }
2829 }
2830 context->mount_id = mount_id;
2831
2832 list_add_tail(&(yaffs_dev_to_lc(dev)->context_list),
2833 &yaffs_context_list);
2834 mutex_unlock(&yaffs_context_lock);
2835
2836 /* Directory search handling... */
2837 INIT_LIST_HEAD(&(yaffs_dev_to_lc(dev)->search_contexts));
2838 param->remove_obj_fn = yaffs_remove_obj_callback;
2839
2840 mutex_init(&(yaffs_dev_to_lc(dev)->gross_lock));
2841
2842 yaffs_gross_lock(dev);
2843
2844 err = yaffs_guts_initialise(dev);
2845
2846 yaffs_trace(YAFFS_TRACE_OS,
2847 "yaffs_read_super: guts initialised %s",
2848 (err == YAFFS_OK) ? "OK" : "FAILED");
2849
2850 if (err == YAFFS_OK)
2851 yaffs_bg_start(dev);
2852
2853 if (!context->bg_thread)
2854 param->defered_dir_update = 0;
2855
2856 sb->s_maxbytes = yaffs_max_file_size(dev);
2857
2858 /* Release lock before yaffs_get_inode() */
2859 yaffs_gross_unlock(dev);
2860
2861 /* Create root inode */
2862 if (err == YAFFS_OK)
2863 inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0, yaffs_root(dev));
2864
2865 if (!inode)
2866 return NULL;
2867
2868 inode->i_op = &yaffs_dir_inode_operations;
2869 inode->i_fop = &yaffs_dir_operations;
2870
2871 yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: got root inode");
2872
2873 root = yaffs_make_root(inode);
2874
2875 if (!root)
2876 return NULL;
2877
2878 sb->s_root = root;
2879 if(!dev->is_checkpointed)
2880 yaffs_set_super_dirty(dev);
2881
2882 yaffs_trace(YAFFS_TRACE_ALWAYS,
2883 "yaffs_read_super: is_checkpointed %d",
2884 dev->is_checkpointed);
2885
2886 yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: done");
2887 return sb;
2888 }
2889
2890 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2891 static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
2892 int silent)
2893 {
2894 return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
2895 }
2896
2897 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39))
2898 static struct dentry *yaffs_mount(struct file_system_type *fs_type, int flags,
2899 const char *dev_name, void *data)
2900 {
2901 return mount_bdev(fs_type, flags, dev_name, data, yaffs_internal_read_super_mtd);
2902 }
2903 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2904 static int yaffs_read_super(struct file_system_type *fs,
2905 int flags, const char *dev_name,
2906 void *data, struct vfsmount *mnt)
2907 {
2908
2909 return get_sb_bdev(fs, flags, dev_name, data,
2910 yaffs_internal_read_super_mtd, mnt);
2911 }
2912 #else
2913 static struct super_block *yaffs_read_super(struct file_system_type *fs,
2914 int flags, const char *dev_name,
2915 void *data)
2916 {
2917
2918 return get_sb_bdev(fs, flags, dev_name, data,
2919 yaffs_internal_read_super_mtd);
2920 }
2921 #endif
2922
2923 static struct file_system_type yaffs_fs_type = {
2924 .owner = THIS_MODULE,
2925 .name = "yaffs",
2926 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39))
2927 .mount = yaffs_mount,
2928 #else
2929 .get_sb = yaffs_read_super,
2930 #endif
2931 .kill_sb = kill_block_super,
2932 .fs_flags = FS_REQUIRES_DEV,
2933 };
2934 #else
2935 static struct super_block *yaffs_read_super(struct super_block *sb, void *data,
2936 int silent)
2937 {
2938 return yaffs_internal_read_super(1, sb, data, silent);
2939 }
2940
2941 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super,
2942 FS_REQUIRES_DEV);
2943 #endif
2944
2945
2946 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2947 static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
2948 int silent)
2949 {
2950 return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
2951 }
2952
2953 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39))
2954 static struct dentry *yaffs2_mount(struct file_system_type *fs_type, int flags,
2955 const char *dev_name, void *data)
2956 {
2957 return mount_bdev(fs_type, flags, dev_name, data, yaffs2_internal_read_super_mtd);
2958 }
2959 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2960 static int yaffs2_read_super(struct file_system_type *fs,
2961 int flags, const char *dev_name, void *data,
2962 struct vfsmount *mnt)
2963 {
2964 return get_sb_bdev(fs, flags, dev_name, data,
2965 yaffs2_internal_read_super_mtd, mnt);
2966 }
2967 #else
2968 static struct super_block *yaffs2_read_super(struct file_system_type *fs,
2969 int flags, const char *dev_name,
2970 void *data)
2971 {
2972
2973 return get_sb_bdev(fs, flags, dev_name, data,
2974 yaffs2_internal_read_super_mtd);
2975 }
2976 #endif
2977
2978 static struct file_system_type yaffs2_fs_type = {
2979 .owner = THIS_MODULE,
2980 .name = "yaffs2",
2981 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39))
2982 .mount = yaffs2_mount,
2983 #else
2984 .get_sb = yaffs2_read_super,
2985 #endif
2986 .kill_sb = kill_block_super,
2987 .fs_flags = FS_REQUIRES_DEV,
2988 };
2989 #else
2990 static struct super_block *yaffs2_read_super(struct super_block *sb,
2991 void *data, int silent)
2992 {
2993 return yaffs_internal_read_super(2, sb, data, silent);
2994 }
2995
2996 static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super,
2997 FS_REQUIRES_DEV);
2998 #endif
2999
3000
3001 static struct proc_dir_entry *my_proc_entry;
3002
3003 static char *yaffs_dump_dev_part0(char *buf, struct yaffs_dev *dev)
3004 {
3005 struct yaffs_param *param = &dev->param;
3006 int bs[10];
3007
3008 yaffs_count_blocks_by_state(dev,bs);
3009
3010 buf += sprintf(buf, "start_block.......... %d\n", param->start_block);
3011 buf += sprintf(buf, "end_block............ %d\n", param->end_block);
3012 buf += sprintf(buf, "total_bytes_per_chunk %d\n",
3013 param->total_bytes_per_chunk);
3014 buf += sprintf(buf, "use_nand_ecc......... %d\n", param->use_nand_ecc);
3015 buf += sprintf(buf, "no_tags_ecc.......... %d\n", param->no_tags_ecc);
3016 buf += sprintf(buf, "is_yaffs2............ %d\n", param->is_yaffs2);
3017 buf += sprintf(buf, "inband_tags.......... %d\n", param->inband_tags);
3018 buf += sprintf(buf, "empty_lost_n_found... %d\n",
3019 param->empty_lost_n_found);
3020 buf += sprintf(buf, "disable_lazy_load.... %d\n",
3021 param->disable_lazy_load);
3022 buf += sprintf(buf, "disable_bad_block_mrk %d\n",
3023 param->disable_bad_block_marking);
3024 buf += sprintf(buf, "refresh_period....... %d\n",
3025 param->refresh_period);
3026 buf += sprintf(buf, "n_caches............. %d\n", param->n_caches);
3027 buf += sprintf(buf, "n_reserved_blocks.... %d\n",
3028 param->n_reserved_blocks);
3029 buf += sprintf(buf, "always_check_erased.. %d\n",
3030 param->always_check_erased);
3031 buf += sprintf(buf, "\n");
3032 buf += sprintf(buf, "block count by state\n");
3033 buf += sprintf(buf, "0:%d 1:%d 2:%d 3:%d 4:%d\n",
3034 bs[0], bs[1], bs[2], bs[3], bs[4]);
3035 buf += sprintf(buf, "5:%d 6:%d 7:%d 8:%d 9:%d\n",
3036 bs[5], bs[6], bs[7], bs[8], bs[9]);
3037
3038 return buf;
3039 }
3040
3041 static char *yaffs_dump_dev_part1(char *buf, struct yaffs_dev *dev)
3042 {
3043 buf += sprintf(buf, "max file size....... %lld\n",
3044 (long long) yaffs_max_file_size(dev));
3045 buf += sprintf(buf, "data_bytes_per_chunk. %d\n",
3046 dev->data_bytes_per_chunk);
3047 buf += sprintf(buf, "chunk_grp_bits....... %d\n", dev->chunk_grp_bits);
3048 buf += sprintf(buf, "chunk_grp_size....... %d\n", dev->chunk_grp_size);
3049 buf += sprintf(buf, "n_erased_blocks...... %d\n", dev->n_erased_blocks);
3050 buf += sprintf(buf, "blocks_in_checkpt.... %d\n",
3051 dev->blocks_in_checkpt);
3052 buf += sprintf(buf, "\n");
3053 buf += sprintf(buf, "n_tnodes............. %d\n", dev->n_tnodes);
3054 buf += sprintf(buf, "n_obj................ %d\n", dev->n_obj);
3055 buf += sprintf(buf, "n_free_chunks........ %d\n", dev->n_free_chunks);
3056 buf += sprintf(buf, "\n");
3057 buf += sprintf(buf, "n_page_writes........ %u\n", dev->n_page_writes);
3058 buf += sprintf(buf, "n_page_reads......... %u\n", dev->n_page_reads);
3059 buf += sprintf(buf, "n_erasures........... %u\n", dev->n_erasures);
3060 buf += sprintf(buf, "n_gc_copies.......... %u\n", dev->n_gc_copies);
3061 buf += sprintf(buf, "all_gcs.............. %u\n", dev->all_gcs);
3062 buf += sprintf(buf, "passive_gc_count..... %u\n",
3063 dev->passive_gc_count);
3064 buf += sprintf(buf, "oldest_dirty_gc_count %u\n",
3065 dev->oldest_dirty_gc_count);
3066 buf += sprintf(buf, "n_gc_blocks.......... %u\n", dev->n_gc_blocks);
3067 buf += sprintf(buf, "bg_gcs............... %u\n", dev->bg_gcs);
3068 buf += sprintf(buf, "n_retried_writes..... %u\n",
3069 dev->n_retried_writes);
3070 buf += sprintf(buf, "n_retired_blocks..... %u\n",
3071 dev->n_retired_blocks);
3072 buf += sprintf(buf, "n_ecc_fixed.......... %u\n", dev->n_ecc_fixed);
3073 buf += sprintf(buf, "n_ecc_unfixed........ %u\n", dev->n_ecc_unfixed);
3074 buf += sprintf(buf, "n_tags_ecc_fixed..... %u\n",
3075 dev->n_tags_ecc_fixed);
3076 buf += sprintf(buf, "n_tags_ecc_unfixed... %u\n",
3077 dev->n_tags_ecc_unfixed);
3078 buf += sprintf(buf, "cache_hits........... %u\n", dev->cache_hits);
3079 buf += sprintf(buf, "n_deleted_files...... %u\n", dev->n_deleted_files);
3080 buf += sprintf(buf, "n_unlinked_files..... %u\n",
3081 dev->n_unlinked_files);
3082 buf += sprintf(buf, "refresh_count........ %u\n", dev->refresh_count);
3083 buf += sprintf(buf, "n_bg_deletions....... %u\n", dev->n_bg_deletions);
3084 buf += sprintf(buf, "tags_used............ %u\n", dev->tags_used);
3085 buf += sprintf(buf, "summary_used......... %u\n", dev->summary_used);
3086
3087 return buf;
3088 }
3089
3090 static int yaffs_proc_read(char *page,
3091 char **start,
3092 off_t offset, int count, int *eof, void *data)
3093 {
3094 struct list_head *item;
3095 char *buf = page;
3096 int step = offset;
3097 int n = 0;
3098
3099 /* Get proc_file_read() to step 'offset' by one on each sucessive call.
3100 * We use 'offset' (*ppos) to indicate where we are in dev_list.
3101 * This also assumes the user has posted a read buffer large
3102 * enough to hold the complete output; but that's life in /proc.
3103 */
3104
3105 *(int *)start = 1;
3106
3107 /* Print header first */
3108 if (step == 0)
3109 buf +=
3110 sprintf(buf,
3111 "Multi-version YAFFS built:" __DATE__ " " __TIME__
3112 "\n");
3113 else if (step == 1)
3114 buf += sprintf(buf, "\n");
3115 else {
3116 step -= 2;
3117
3118 mutex_lock(&yaffs_context_lock);
3119
3120 /* Locate and print the Nth entry. Order N-squared but N is small. */
3121 list_for_each(item, &yaffs_context_list) {
3122 struct yaffs_linux_context *dc =
3123 list_entry(item, struct yaffs_linux_context,
3124 context_list);
3125 struct yaffs_dev *dev = dc->dev;
3126
3127 if (n < (step & ~1)) {
3128 n += 2;
3129 continue;
3130 }
3131 if ((step & 1) == 0) {
3132 buf +=
3133 sprintf(buf, "\nDevice %d \"%s\"\n", n,
3134 dev->param.name);
3135 buf = yaffs_dump_dev_part0(buf, dev);
3136 } else {
3137 buf = yaffs_dump_dev_part1(buf, dev);
3138 }
3139
3140 break;
3141 }
3142 mutex_unlock(&yaffs_context_lock);
3143 }
3144
3145 return buf - page < count ? buf - page : count;
3146 }
3147
3148 /**
3149 * Set the verbosity of the warnings and error messages.
3150 *
3151 * Note that the names can only be a..z or _ with the current code.
3152 */
3153
3154 static struct {
3155 char *mask_name;
3156 unsigned mask_bitfield;
3157 } mask_flags[] = {
3158 {"allocate", YAFFS_TRACE_ALLOCATE},
3159 {"always", YAFFS_TRACE_ALWAYS},
3160 {"background", YAFFS_TRACE_BACKGROUND},
3161 {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
3162 {"buffers", YAFFS_TRACE_BUFFERS},
3163 {"bug", YAFFS_TRACE_BUG},
3164 {"checkpt", YAFFS_TRACE_CHECKPOINT},
3165 {"deletion", YAFFS_TRACE_DELETION},
3166 {"erase", YAFFS_TRACE_ERASE},
3167 {"error", YAFFS_TRACE_ERROR},
3168 {"gc_detail", YAFFS_TRACE_GC_DETAIL},
3169 {"gc", YAFFS_TRACE_GC},
3170 {"lock", YAFFS_TRACE_LOCK},
3171 {"mtd", YAFFS_TRACE_MTD},
3172 {"nandaccess", YAFFS_TRACE_NANDACCESS},
3173 {"os", YAFFS_TRACE_OS},
3174 {"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
3175 {"scan", YAFFS_TRACE_SCAN},
3176 {"mount", YAFFS_TRACE_MOUNT},
3177 {"tracing", YAFFS_TRACE_TRACING},
3178 {"sync", YAFFS_TRACE_SYNC},
3179 {"write", YAFFS_TRACE_WRITE},
3180 {"verify", YAFFS_TRACE_VERIFY},
3181 {"verify_nand", YAFFS_TRACE_VERIFY_NAND},
3182 {"verify_full", YAFFS_TRACE_VERIFY_FULL},
3183 {"verify_all", YAFFS_TRACE_VERIFY_ALL},
3184 {"all", 0xffffffff},
3185 {"none", 0},
3186 {NULL, 0},
3187 };
3188
3189 #define MAX_MASK_NAME_LENGTH 40
3190 static int yaffs_proc_write_trace_options(struct file *file, const char *buf,
3191 unsigned long count, void *data)
3192 {
3193 unsigned rg = 0, mask_bitfield;
3194 char *end;
3195 char *mask_name;
3196 const char *x;
3197 char substring[MAX_MASK_NAME_LENGTH + 1];
3198 int i;
3199 int done = 0;
3200 int add, len = 0;
3201 int pos = 0;
3202
3203 rg = yaffs_trace_mask;
3204
3205 while (!done && (pos < count)) {
3206 done = 1;
3207 while ((pos < count) && isspace(buf[pos]))
3208 pos++;
3209
3210 switch (buf[pos]) {
3211 case '+':
3212 case '-':
3213 case '=':
3214 add = buf[pos];
3215 pos++;
3216 break;
3217
3218 default:
3219 add = ' ';
3220 break;
3221 }
3222 mask_name = NULL;
3223
3224 mask_bitfield = simple_strtoul(buf + pos, &end, 0);
3225
3226 if (end > buf + pos) {
3227 mask_name = "numeral";
3228 len = end - (buf + pos);
3229 pos += len;
3230 done = 0;
3231 } else {
3232 for (x = buf + pos, i = 0;
3233 (*x == '_' || (*x >= 'a' && *x <= 'z')) &&
3234 i < MAX_MASK_NAME_LENGTH; x++, i++, pos++)
3235 substring[i] = *x;
3236 substring[i] = '\0';
3237
3238 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
3239 if (strcmp(substring, mask_flags[i].mask_name)
3240 == 0) {
3241 mask_name = mask_flags[i].mask_name;
3242 mask_bitfield =
3243 mask_flags[i].mask_bitfield;
3244 done = 0;
3245 break;
3246 }
3247 }
3248 }
3249
3250 if (mask_name != NULL) {
3251 done = 0;
3252 switch (add) {
3253 case '-':
3254 rg &= ~mask_bitfield;
3255 break;
3256 case '+':
3257 rg |= mask_bitfield;
3258 break;
3259 case '=':
3260 rg = mask_bitfield;
3261 break;
3262 default:
3263 rg |= mask_bitfield;
3264 break;
3265 }
3266 }
3267 }
3268
3269 yaffs_trace_mask = rg | YAFFS_TRACE_ALWAYS;
3270
3271 printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_trace_mask);
3272
3273 if (rg & YAFFS_TRACE_ALWAYS) {
3274 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
3275 char flag;
3276 flag = ((rg & mask_flags[i].mask_bitfield) ==
3277 mask_flags[i].mask_bitfield) ? '+' : '-';
3278 printk(KERN_DEBUG "%c%s\n", flag,
3279 mask_flags[i].mask_name);
3280 }
3281 }
3282
3283 return count;
3284 }
3285
3286 /* Debug strings are of the form:
3287 * .bnnn print info on block n
3288 * .cobjn,chunkn print nand chunk id for objn:chunkn
3289 */
3290
3291 static int yaffs_proc_debug_write(struct file *file, const char *buf,
3292 unsigned long count, void *data)
3293 {
3294
3295 char str[100];
3296 char *p0;
3297 char *p1;
3298 long p1_val;
3299 long p0_val;
3300 char cmd;
3301 struct list_head *item;
3302
3303 memset(str, 0, sizeof(str));
3304 memcpy(str, buf, min(count, sizeof(str) -1));
3305
3306 cmd = str[1];
3307
3308 p0 = str + 2;
3309
3310 p1 = p0;
3311
3312 while (*p1 && *p1 != ',') {
3313 p1++;
3314 }
3315 *p1 = '\0';
3316 p1++;
3317
3318 p0_val = simple_strtol(p0, NULL, 0);
3319 p1_val = simple_strtol(p1, NULL, 0);
3320
3321
3322 mutex_lock(&yaffs_context_lock);
3323
3324 /* Locate and print the Nth entry. Order N-squared but N is small. */
3325 list_for_each(item, &yaffs_context_list) {
3326 struct yaffs_linux_context *dc =
3327 list_entry(item, struct yaffs_linux_context,
3328 context_list);
3329 struct yaffs_dev *dev = dc->dev;
3330
3331 if (cmd == 'b') {
3332 struct yaffs_block_info *bi;
3333
3334 bi = yaffs_get_block_info(dev,p0_val);
3335
3336 if(bi) {
3337 printk("Block %d: state %d, retire %d, use %d, seq %d\n",
3338 (int)p0_val, bi->block_state,
3339 bi->needs_retiring, bi->pages_in_use,
3340 bi->seq_number);
3341 }
3342 } else if (cmd == 'c') {
3343 struct yaffs_obj *obj;
3344 int nand_chunk;
3345
3346 obj = yaffs_find_by_number(dev, p0_val);
3347 if (!obj)
3348 printk("No obj %d\n", (int)p0_val);
3349 else {
3350 if(p1_val == 0)
3351 nand_chunk = obj->hdr_chunk;
3352 else
3353 nand_chunk =
3354 yaffs_find_chunk_in_file(obj,
3355 p1_val, NULL);
3356 printk("Nand chunk for %d:%d is %d\n",
3357 (int)p0_val, (int)p1_val, nand_chunk);
3358 }
3359 }
3360 }
3361
3362 mutex_unlock(&yaffs_context_lock);
3363
3364 return count;
3365 }
3366
3367 static int yaffs_proc_write(struct file *file, const char *buf,
3368 unsigned long count, void *data)
3369 {
3370 if (buf[0] == '.')
3371 return yaffs_proc_debug_write(file, buf, count, data);
3372 return yaffs_proc_write_trace_options(file, buf, count, data);
3373 }
3374
3375 /* Stuff to handle installation of file systems */
3376 struct file_system_to_install {
3377 struct file_system_type *fst;
3378 int installed;
3379 };
3380
3381 static struct file_system_to_install fs_to_install[] = {
3382 {&yaffs_fs_type, 0},
3383 {&yaffs2_fs_type, 0},
3384 {NULL, 0}
3385 };
3386
3387 static int __init init_yaffs_fs(void)
3388 {
3389 int error = 0;
3390 struct file_system_to_install *fsinst;
3391
3392 yaffs_trace(YAFFS_TRACE_ALWAYS,
3393 "yaffs built " __DATE__ " " __TIME__ " Installing.");
3394
3395 mutex_init(&yaffs_context_lock);
3396
3397 /* Install the proc_fs entries */
3398 my_proc_entry = create_proc_entry("yaffs",
3399 S_IRUGO | S_IFREG, YPROC_ROOT);
3400
3401 if (my_proc_entry) {
3402 my_proc_entry->write_proc = yaffs_proc_write;
3403 my_proc_entry->read_proc = yaffs_proc_read;
3404 my_proc_entry->data = NULL;
3405 } else {
3406 return -ENOMEM;
3407 }
3408
3409 /* Now add the file system entries */
3410
3411 fsinst = fs_to_install;
3412
3413 while (fsinst->fst && !error) {
3414 error = register_filesystem(fsinst->fst);
3415 if (!error)
3416 fsinst->installed = 1;
3417 fsinst++;
3418 }
3419
3420 /* Any errors? uninstall */
3421 if (error) {
3422 fsinst = fs_to_install;
3423
3424 while (fsinst->fst) {
3425 if (fsinst->installed) {
3426 unregister_filesystem(fsinst->fst);
3427 fsinst->installed = 0;
3428 }
3429 fsinst++;
3430 }
3431 }
3432
3433 return error;
3434 }
3435
3436 static void __exit exit_yaffs_fs(void)
3437 {
3438
3439 struct file_system_to_install *fsinst;
3440
3441 yaffs_trace(YAFFS_TRACE_ALWAYS,
3442 "yaffs built " __DATE__ " " __TIME__ " removing.");
3443
3444 remove_proc_entry("yaffs", YPROC_ROOT);
3445
3446 fsinst = fs_to_install;
3447
3448 while (fsinst->fst) {
3449 if (fsinst->installed) {
3450 unregister_filesystem(fsinst->fst);
3451 fsinst->installed = 0;
3452 }
3453 fsinst++;
3454 }
3455 }
3456
3457 module_init(init_yaffs_fs)
3458 module_exit(exit_yaffs_fs)
3459
3460 MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
3461 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2011");
3462 MODULE_LICENSE("GPL");
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