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generic: fold yaffs_git_2010_10_20 patch to generic/files
[openwrt/staging/yousong.git] / target / linux / generic / files / fs / yaffs2 / yaffs_vfs_glue.c
1 /*
2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
3 *
4 * Copyright (C) 2002-2010 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
6 *
7 * Created by Charles Manning <charles@aleph1.co.uk>
8 * Acknowledgements:
9 * Luc van OostenRyck for numerous patches.
10 * Nick Bane for numerous patches.
11 * Nick Bane for 2.5/2.6 integration.
12 * Andras Toth for mknod rdev issue.
13 * Michael Fischer for finding the problem with inode inconsistency.
14 * Some code bodily lifted from JFFS
15 *
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License version 2 as
18 * published by the Free Software Foundation.
19 */
20
21 /*
22 *
23 * This is the file system front-end to YAFFS that hooks it up to
24 * the VFS.
25 *
26 * Special notes:
27 * >> 2.4: sb->u.generic_sbp points to the yaffs_dev_t associated with
28 * this superblock
29 * >> 2.6: sb->s_fs_info points to the yaffs_dev_t associated with this
30 * superblock
31 * >> inode->u.generic_ip points to the associated yaffs_obj_t.
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(2, 6, 19))
66 #include <linux/config.h>
67 #endif
68
69 #include <linux/kernel.h>
70 #include <linux/module.h>
71 #include <linux/slab.h>
72 #include <linux/init.h>
73 #include <linux/fs.h>
74 #include <linux/proc_fs.h>
75 #include <linux/smp_lock.h>
76 #include <linux/pagemap.h>
77 #include <linux/mtd/mtd.h>
78 #include <linux/interrupt.h>
79 #include <linux/string.h>
80 #include <linux/ctype.h>
81
82 #if (YAFFS_NEW_FOLLOW_LINK == 1)
83 #include <linux/namei.h>
84 #endif
85
86 #ifdef YAFFS_COMPILE_EXPORTFS
87 #include <linux/exportfs.h>
88 #endif
89
90 #ifdef YAFFS_COMPILE_BACKGROUND
91 #include <linux/kthread.h>
92 #include <linux/delay.h>
93 #endif
94 #ifdef YAFFS_COMPILE_FREEZER
95 #include <linux/freezer.h>
96 #endif
97
98 #include <asm/div64.h>
99
100 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
101
102 #include <linux/statfs.h>
103
104 #define UnlockPage(p) unlock_page(p)
105 #define Page_Uptodate(page) test_bit(PG_uptodate, &(page)->flags)
106
107 /* FIXME: use sb->s_id instead ? */
108 #define yaffs_devname(sb, buf) bdevname(sb->s_bdev, buf)
109
110 #else
111
112 #include <linux/locks.h>
113 #define BDEVNAME_SIZE 0
114 #define yaffs_devname(sb, buf) kdevname(sb->s_dev)
115
116 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0))
117 /* added NCB 26/5/2006 for 2.4.25-vrs2-tcl1 kernel */
118 #define __user
119 #endif
120
121 #endif
122
123 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26))
124 #define YPROC_ROOT (&proc_root)
125 #else
126 #define YPROC_ROOT NULL
127 #endif
128
129 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,26))
130 #define Y_INIT_TIMER(a) init_timer(a)
131 #else
132 #define Y_INIT_TIMER(a) init_timer_on_stack(a)
133 #endif
134
135 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
136 #define WRITE_SIZE_STR "writesize"
137 #define WRITE_SIZE(mtd) ((mtd)->writesize)
138 #else
139 #define WRITE_SIZE_STR "oobblock"
140 #define WRITE_SIZE(mtd) ((mtd)->oobblock)
141 #endif
142
143 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 27))
144 #define YAFFS_USE_WRITE_BEGIN_END 1
145 #else
146 #define YAFFS_USE_WRITE_BEGIN_END 0
147 #endif
148
149 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 28))
150 static uint32_t YCALCBLOCKS(uint64_t partition_size, uint32_t block_size)
151 {
152 uint64_t result = partition_size;
153 do_div(result, block_size);
154 return (uint32_t)result;
155 }
156 #else
157 #define YCALCBLOCKS(s, b) ((s)/(b))
158 #endif
159
160 #include <linux/uaccess.h>
161 #include <linux/mtd/mtd.h>
162
163 #include "yportenv.h"
164 #include "yaffs_trace.h"
165 #include "yaffs_guts.h"
166
167 #include "yaffs_linux.h"
168
169 #include "yaffs_mtdif.h"
170 #include "yaffs_mtdif1.h"
171 #include "yaffs_mtdif2.h"
172
173 unsigned int yaffs_trace_mask = YAFFS_TRACE_BAD_BLOCKS | YAFFS_TRACE_ALWAYS;
174 unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS;
175 unsigned int yaffs_auto_checkpoint = 1;
176 unsigned int yaffs_gc_control = 1;
177 unsigned int yaffs_bg_enable = 1;
178
179 /* Module Parameters */
180 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
181 module_param(yaffs_trace_mask, uint, 0644);
182 module_param(yaffs_wr_attempts, uint, 0644);
183 module_param(yaffs_auto_checkpoint, uint, 0644);
184 module_param(yaffs_gc_control, uint, 0644);
185 module_param(yaffs_bg_enable, uint, 0644);
186 #else
187 MODULE_PARM(yaffs_trace_mask, "i");
188 MODULE_PARM(yaffs_wr_attempts, "i");
189 MODULE_PARM(yaffs_auto_checkpoint, "i");
190 MODULE_PARM(yaffs_gc_control, "i");
191 #endif
192
193 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25))
194 /* use iget and read_inode */
195 #define Y_IGET(sb, inum) iget((sb), (inum))
196 static void yaffs_read_inode(struct inode *inode);
197
198 #else
199 /* Call local equivalent */
200 #define YAFFS_USE_OWN_IGET
201 #define Y_IGET(sb, inum) yaffs_iget((sb), (inum))
202
203 static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino);
204 #endif
205
206 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
207 #define yaffs_InodeToObjectLV(iptr) ((iptr)->i_private)
208 #else
209 #define yaffs_InodeToObjectLV(iptr) ((iptr)->u.generic_ip)
210 #endif
211
212 #define yaffs_InodeToObject(iptr) ((yaffs_obj_t *)(yaffs_InodeToObjectLV(iptr)))
213 #define yaffs_dentry_to_obj(dptr) yaffs_InodeToObject((dptr)->d_inode)
214
215 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
216 #define yaffs_SuperToDevice(sb) ((yaffs_dev_t *)sb->s_fs_info)
217 #else
218 #define yaffs_SuperToDevice(sb) ((yaffs_dev_t *)sb->u.generic_sbp)
219 #endif
220
221
222 #define update_dir_time(dir) do {\
223 (dir)->i_ctime = (dir)->i_mtime = CURRENT_TIME; \
224 } while(0)
225
226 static void yaffs_put_super(struct super_block *sb);
227
228 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
229 loff_t *pos);
230 static ssize_t yaffs_hold_space(struct file *f);
231 static void yaffs_release_space(struct file *f);
232
233 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
234 static int yaffs_file_flush(struct file *file, fl_owner_t id);
235 #else
236 static int yaffs_file_flush(struct file *file);
237 #endif
238
239 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34))
240 static int yaffs_sync_object(struct file *file, int datasync);
241 #else
242 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
243 int datasync);
244 #endif
245
246 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
247
248 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
249 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
250 struct nameidata *n);
251 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
252 struct nameidata *n);
253 #else
254 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode);
255 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry);
256 #endif
257 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
258 struct dentry *dentry);
259 static int yaffs_unlink(struct inode *dir, struct dentry *dentry);
260 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
261 const char *symname);
262 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
263
264 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
265 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
266 dev_t dev);
267 #else
268 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
269 int dev);
270 #endif
271 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
272 struct inode *new_dir, struct dentry *new_dentry);
273 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr);
274
275 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
276 static int yaffs_sync_fs(struct super_block *sb, int wait);
277 static void yaffs_write_super(struct super_block *sb);
278 #else
279 static int yaffs_sync_fs(struct super_block *sb);
280 static int yaffs_write_super(struct super_block *sb);
281 #endif
282
283 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
284 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf);
285 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
286 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf);
287 #else
288 static int yaffs_statfs(struct super_block *sb, struct statfs *buf);
289 #endif
290
291 #ifdef YAFFS_HAS_PUT_INODE
292 static void yaffs_put_inode(struct inode *inode);
293 #endif
294
295 #ifdef YAFFS_HAS_EVICT_INODE
296 static void yaffs_evict_inode(struct inode *);
297 #else
298 static void yaffs_delete_inode(struct inode *);
299 static void yaffs_clear_inode(struct inode *);
300 #endif
301
302 static int yaffs_readpage(struct file *file, struct page *page);
303 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
304 static int yaffs_writepage(struct page *page, struct writeback_control *wbc);
305 #else
306 static int yaffs_writepage(struct page *page);
307 #endif
308
309 #ifdef CONFIG_YAFFS_XATTR
310 int yaffs_setxattr(struct dentry *dentry, const char *name,
311 const void *value, size_t size, int flags);
312 ssize_t yaffs_getxattr(struct dentry *dentry, const char *name, void *buff,
313 size_t size);
314 int yaffs_removexattr(struct dentry *dentry, const char *name);
315 ssize_t yaffs_listxattr(struct dentry *dentry, char *buff, size_t size);
316 #endif
317
318
319 #if (YAFFS_USE_WRITE_BEGIN_END != 0)
320 static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
321 loff_t pos, unsigned len, unsigned flags,
322 struct page **pagep, void **fsdata);
323 static int yaffs_write_end(struct file *filp, struct address_space *mapping,
324 loff_t pos, unsigned len, unsigned copied,
325 struct page *pg, void *fsdadata);
326 #else
327 static int yaffs_prepare_write(struct file *f, struct page *pg,
328 unsigned offset, unsigned to);
329 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
330 unsigned to);
331
332 #endif
333
334 static int yaffs_readlink(struct dentry *dentry, char __user *buffer,
335 int buflen);
336 #if (YAFFS_NEW_FOLLOW_LINK == 1)
337 void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias);
338 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
339 #else
340 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
341 #endif
342
343 static void yaffs_touch_super(yaffs_dev_t *dev);
344
345 static loff_t yaffs_dir_llseek(struct file *file, loff_t offset, int origin);
346
347 static int yaffs_vfs_setattr(struct inode *, struct iattr *);
348
349
350 static struct address_space_operations yaffs_file_address_operations = {
351 .readpage = yaffs_readpage,
352 .writepage = yaffs_writepage,
353 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
354 .write_begin = yaffs_write_begin,
355 .write_end = yaffs_write_end,
356 #else
357 .prepare_write = yaffs_prepare_write,
358 .commit_write = yaffs_commit_write,
359 #endif
360 };
361
362
363 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 22))
364 static const struct file_operations yaffs_file_operations = {
365 .read = do_sync_read,
366 .write = do_sync_write,
367 .aio_read = generic_file_aio_read,
368 .aio_write = generic_file_aio_write,
369 .mmap = generic_file_mmap,
370 .flush = yaffs_file_flush,
371 .fsync = yaffs_sync_object,
372 .splice_read = generic_file_splice_read,
373 .splice_write = generic_file_splice_write,
374 .llseek = generic_file_llseek,
375 };
376
377 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
378
379 static const struct file_operations yaffs_file_operations = {
380 .read = do_sync_read,
381 .write = do_sync_write,
382 .aio_read = generic_file_aio_read,
383 .aio_write = generic_file_aio_write,
384 .mmap = generic_file_mmap,
385 .flush = yaffs_file_flush,
386 .fsync = yaffs_sync_object,
387 .sendfile = generic_file_sendfile,
388 };
389
390 #else
391
392 static const struct file_operations yaffs_file_operations = {
393 .read = generic_file_read,
394 .write = generic_file_write,
395 .mmap = generic_file_mmap,
396 .flush = yaffs_file_flush,
397 .fsync = yaffs_sync_object,
398 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
399 .sendfile = generic_file_sendfile,
400 #endif
401 };
402 #endif
403
404 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25))
405 static void zero_user_segment(struct page *page, unsigned start, unsigned end)
406 {
407 void * kaddr = kmap_atomic(page, KM_USER0);
408 memset(kaddr + start, 0, end - start);
409 kunmap_atomic(kaddr, KM_USER0);
410 flush_dcache_page(page);
411 }
412 #endif
413
414
415 static const struct inode_operations yaffs_file_inode_operations = {
416 .setattr = yaffs_setattr,
417 #ifdef CONFIG_YAFFS_XATTR
418 .setxattr = yaffs_setxattr,
419 .getxattr = yaffs_getxattr,
420 .listxattr = yaffs_listxattr,
421 .removexattr = yaffs_removexattr,
422 #endif
423 };
424
425 static const struct inode_operations yaffs_symlink_inode_operations = {
426 .readlink = yaffs_readlink,
427 .follow_link = yaffs_follow_link,
428 #if (YAFFS_NEW_FOLLOW_LINK == 1)
429 .put_link = yaffs_put_link,
430 #endif
431 .setattr = yaffs_setattr,
432 #ifdef CONFIG_YAFFS_XATTR
433 .setxattr = yaffs_setxattr,
434 .getxattr = yaffs_getxattr,
435 .listxattr = yaffs_listxattr,
436 .removexattr = yaffs_removexattr,
437 #endif
438 };
439
440 static const struct inode_operations yaffs_dir_inode_operations = {
441 .create = yaffs_create,
442 .lookup = yaffs_lookup,
443 .link = yaffs_link,
444 .unlink = yaffs_unlink,
445 .symlink = yaffs_symlink,
446 .mkdir = yaffs_mkdir,
447 .rmdir = yaffs_unlink,
448 .mknod = yaffs_mknod,
449 .rename = yaffs_rename,
450 .setattr = yaffs_setattr,
451 #ifdef CONFIG_YAFFS_XATTR
452 .setxattr = yaffs_setxattr,
453 .getxattr = yaffs_getxattr,
454 .listxattr = yaffs_listxattr,
455 .removexattr = yaffs_removexattr,
456 #endif
457 };
458
459 static const struct file_operations yaffs_dir_operations = {
460 .read = generic_read_dir,
461 .readdir = yaffs_readdir,
462 .fsync = yaffs_sync_object,
463 .llseek = yaffs_dir_llseek,
464 };
465
466 static const struct super_operations yaffs_super_ops = {
467 .statfs = yaffs_statfs,
468
469 #ifndef YAFFS_USE_OWN_IGET
470 .read_inode = yaffs_read_inode,
471 #endif
472 #ifdef YAFFS_HAS_PUT_INODE
473 .put_inode = yaffs_put_inode,
474 #endif
475 .put_super = yaffs_put_super,
476 #ifdef YAFFS_HAS_EVICT_INODE
477 .evict_inode = yaffs_evict_inode,
478 #else
479 .delete_inode = yaffs_delete_inode,
480 .clear_inode = yaffs_clear_inode,
481 #endif
482 .sync_fs = yaffs_sync_fs,
483 .write_super = yaffs_write_super,
484 };
485
486
487 static int yaffs_vfs_setattr(struct inode *inode, struct iattr *attr)
488 {
489 #ifdef YAFFS_USE_SETATTR_COPY
490 setattr_copy(inode,attr);
491 return 0;
492 #else
493 return inode_setattr(inode, attr);
494 #endif
495
496 }
497
498 static int yaffs_vfs_setsize(struct inode *inode, loff_t newsize)
499 {
500 #ifdef YAFFS_USE_TRUNCATE_SETSIZE
501 truncate_setsize(inode,newsize);
502 return 0;
503 #else
504 truncate_inode_pages(&inode->i_data,newsize);
505 return 0;
506 #endif
507
508 }
509
510 static unsigned yaffs_gc_control_callback(yaffs_dev_t *dev)
511 {
512 return yaffs_gc_control;
513 }
514
515 static void yaffs_gross_lock(yaffs_dev_t *dev)
516 {
517 T(YAFFS_TRACE_LOCK, (TSTR("yaffs locking %p\n"), current));
518 down(&(yaffs_dev_to_lc(dev)->grossLock));
519 T(YAFFS_TRACE_LOCK, (TSTR("yaffs locked %p\n"), current));
520 }
521
522 static void yaffs_gross_unlock(yaffs_dev_t *dev)
523 {
524 T(YAFFS_TRACE_LOCK, (TSTR("yaffs unlocking %p\n"), current));
525 up(&(yaffs_dev_to_lc(dev)->grossLock));
526 }
527
528 #ifdef YAFFS_COMPILE_EXPORTFS
529
530 static struct inode *
531 yaffs2_nfs_get_inode(struct super_block *sb, uint64_t ino, uint32_t generation)
532 {
533 return Y_IGET(sb, ino);
534 }
535
536 static struct dentry *
537 yaffs2_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len, int fh_type)
538 {
539 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, yaffs2_nfs_get_inode) ;
540 }
541
542 static struct dentry *
543 yaffs2_fh_to_parent(struct super_block *sb, struct fid *fid, int fh_len, int fh_type)
544 {
545 return generic_fh_to_parent(sb, fid, fh_len, fh_type, yaffs2_nfs_get_inode);
546 }
547
548 struct dentry *yaffs2_get_parent(struct dentry *dentry)
549 {
550
551 struct super_block *sb = dentry->d_inode->i_sb;
552 struct dentry *parent = ERR_PTR(-ENOENT);
553 struct inode *inode;
554 unsigned long parent_ino;
555 yaffs_obj_t *d_obj;
556 yaffs_obj_t *parent_obj;
557
558 d_obj = yaffs_InodeToObject(dentry->d_inode);
559
560 if (d_obj) {
561 parent_obj = d_obj->parent;
562 if (parent_obj) {
563 parent_ino = yaffs_get_obj_inode(parent_obj);
564 inode = Y_IGET(sb, parent_ino);
565
566 if (IS_ERR(inode)) {
567 parent = ERR_CAST(inode);
568 } else {
569 parent = d_obtain_alias(inode);
570 if (!IS_ERR(parent)) {
571 parent = ERR_PTR(-ENOMEM);
572 iput(inode);
573 }
574 }
575 }
576 }
577
578 return parent;
579 }
580
581 /* Just declare a zero structure as a NULL value implies
582 * using the default functions of exportfs.
583 */
584
585 static struct export_operations yaffs_export_ops =
586 {
587 .fh_to_dentry = yaffs2_fh_to_dentry,
588 .fh_to_parent = yaffs2_fh_to_parent,
589 .get_parent = yaffs2_get_parent,
590 } ;
591
592 #endif
593
594 /*-----------------------------------------------------------------*/
595 /* Directory search context allows us to unlock access to yaffs during
596 * filldir without causing problems with the directory being modified.
597 * This is similar to the tried and tested mechanism used in yaffs direct.
598 *
599 * A search context iterates along a doubly linked list of siblings in the
600 * directory. If the iterating object is deleted then this would corrupt
601 * the list iteration, likely causing a crash. The search context avoids
602 * this by using the remove_obj_fn to move the search context to the
603 * next object before the object is deleted.
604 *
605 * Many readdirs (and thus seach conexts) may be alive simulateously so
606 * each yaffs_dev_t has a list of these.
607 *
608 * A seach context lives for the duration of a readdir.
609 *
610 * All these functions must be called while yaffs is locked.
611 */
612
613 struct yaffs_SearchContext {
614 yaffs_dev_t *dev;
615 yaffs_obj_t *dirObj;
616 yaffs_obj_t *nextReturn;
617 struct ylist_head others;
618 };
619
620 /*
621 * yaffs_NewSearch() creates a new search context, initialises it and
622 * adds it to the device's search context list.
623 *
624 * Called at start of readdir.
625 */
626 static struct yaffs_SearchContext * yaffs_NewSearch(yaffs_obj_t *dir)
627 {
628 yaffs_dev_t *dev = dir->my_dev;
629 struct yaffs_SearchContext *sc = YMALLOC(sizeof(struct yaffs_SearchContext));
630 if(sc){
631 sc->dirObj = dir;
632 sc->dev = dev;
633 if( ylist_empty(&sc->dirObj->variant.dir_variant.children))
634 sc->nextReturn = NULL;
635 else
636 sc->nextReturn = ylist_entry(
637 dir->variant.dir_variant.children.next,
638 yaffs_obj_t,siblings);
639 YINIT_LIST_HEAD(&sc->others);
640 ylist_add(&sc->others,&(yaffs_dev_to_lc(dev)->searchContexts));
641 }
642 return sc;
643 }
644
645 /*
646 * yaffs_search_end() disposes of a search context and cleans up.
647 */
648 static void yaffs_search_end(struct yaffs_SearchContext * sc)
649 {
650 if(sc){
651 ylist_del(&sc->others);
652 YFREE(sc);
653 }
654 }
655
656 /*
657 * yaffs_search_advance() moves a search context to the next object.
658 * Called when the search iterates or when an object removal causes
659 * the search context to be moved to the next object.
660 */
661 static void yaffs_search_advance(struct yaffs_SearchContext *sc)
662 {
663 if(!sc)
664 return;
665
666 if( sc->nextReturn == NULL ||
667 ylist_empty(&sc->dirObj->variant.dir_variant.children))
668 sc->nextReturn = NULL;
669 else {
670 struct ylist_head *next = sc->nextReturn->siblings.next;
671
672 if( next == &sc->dirObj->variant.dir_variant.children)
673 sc->nextReturn = NULL; /* end of list */
674 else
675 sc->nextReturn = ylist_entry(next,yaffs_obj_t,siblings);
676 }
677 }
678
679 /*
680 * yaffs_remove_obj_callback() is called when an object is unlinked.
681 * We check open search contexts and advance any which are currently
682 * on the object being iterated.
683 */
684 static void yaffs_remove_obj_callback(yaffs_obj_t *obj)
685 {
686
687 struct ylist_head *i;
688 struct yaffs_SearchContext *sc;
689 struct ylist_head *search_contexts = &(yaffs_dev_to_lc(obj->my_dev)->searchContexts);
690
691
692 /* Iterate through the directory search contexts.
693 * If any are currently on the object being removed, then advance
694 * the search context to the next object to prevent a hanging pointer.
695 */
696 ylist_for_each(i, search_contexts) {
697 if (i) {
698 sc = ylist_entry(i, struct yaffs_SearchContext,others);
699 if(sc->nextReturn == obj)
700 yaffs_search_advance(sc);
701 }
702 }
703
704 }
705
706
707 /*-----------------------------------------------------------------*/
708
709 static int yaffs_readlink(struct dentry *dentry, char __user *buffer,
710 int buflen)
711 {
712 unsigned char *alias;
713 int ret;
714
715 yaffs_dev_t *dev = yaffs_dentry_to_obj(dentry)->my_dev;
716
717 yaffs_gross_lock(dev);
718
719 alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
720
721 yaffs_gross_unlock(dev);
722
723 if (!alias)
724 return -ENOMEM;
725
726 ret = vfs_readlink(dentry, buffer, buflen, alias);
727 kfree(alias);
728 return ret;
729 }
730
731 #if (YAFFS_NEW_FOLLOW_LINK == 1)
732 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
733 #else
734 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
735 #endif
736 {
737 unsigned char *alias;
738 int ret;
739 yaffs_dev_t *dev = yaffs_dentry_to_obj(dentry)->my_dev;
740
741 yaffs_gross_lock(dev);
742
743 alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
744 yaffs_gross_unlock(dev);
745
746 if (!alias) {
747 ret = -ENOMEM;
748 goto out;
749 }
750
751 #if (YAFFS_NEW_FOLLOW_LINK == 1)
752 nd_set_link(nd, alias);
753 ret = (int)alias;
754 out:
755 return ERR_PTR(ret);
756 #else
757 ret = vfs_follow_link(nd, alias);
758 kfree(alias);
759 out:
760 return ret;
761 #endif
762 }
763
764 #if (YAFFS_NEW_FOLLOW_LINK == 1)
765 void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias) {
766 kfree(alias);
767 }
768 #endif
769
770 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
771 yaffs_obj_t *obj);
772
773 /*
774 * Lookup is used to find objects in the fs
775 */
776 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
777
778 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
779 struct nameidata *n)
780 #else
781 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry)
782 #endif
783 {
784 yaffs_obj_t *obj;
785 struct inode *inode = NULL; /* NCB 2.5/2.6 needs NULL here */
786
787 yaffs_dev_t *dev = yaffs_InodeToObject(dir)->my_dev;
788
789 if(current != yaffs_dev_to_lc(dev)->readdirProcess)
790 yaffs_gross_lock(dev);
791
792 T(YAFFS_TRACE_OS,
793 (TSTR("yaffs_lookup for %d:%s\n"),
794 yaffs_InodeToObject(dir)->obj_id, dentry->d_name.name));
795
796 obj = yaffs_find_by_name(yaffs_InodeToObject(dir),
797 dentry->d_name.name);
798
799 obj = yaffs_get_equivalent_obj(obj); /* in case it was a hardlink */
800
801 /* Can't hold gross lock when calling yaffs_get_inode() */
802 if(current != yaffs_dev_to_lc(dev)->readdirProcess)
803 yaffs_gross_unlock(dev);
804
805 if (obj) {
806 T(YAFFS_TRACE_OS,
807 (TSTR("yaffs_lookup found %d\n"), obj->obj_id));
808
809 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
810
811 if (inode) {
812 T(YAFFS_TRACE_OS,
813 (TSTR("yaffs_loookup dentry \n")));
814 /* #if 0 asserted by NCB for 2.5/6 compatability - falls through to
815 * d_add even if NULL inode */
816 #if 0
817 /*dget(dentry); // try to solve directory bug */
818 d_add(dentry, inode);
819
820 /* return dentry; */
821 return NULL;
822 #endif
823 }
824
825 } else {
826 T(YAFFS_TRACE_OS,(TSTR("yaffs_lookup not found\n")));
827
828 }
829
830 /* added NCB for 2.5/6 compatability - forces add even if inode is
831 * NULL which creates dentry hash */
832 d_add(dentry, inode);
833
834 return NULL;
835 }
836
837
838 #ifdef YAFFS_HAS_PUT_INODE
839
840 /* For now put inode is just for debugging
841 * Put inode is called when the inode **structure** is put.
842 */
843 static void yaffs_put_inode(struct inode *inode)
844 {
845 T(YAFFS_TRACE_OS,
846 (TSTR("yaffs_put_inode: ino %d, count %d\n"), (int)inode->i_ino,
847 atomic_read(&inode->i_count)));
848
849 }
850 #endif
851
852
853 static void yaffs_unstitch_obj(struct inode *inode, yaffs_obj_t *obj)
854 {
855 /* Clear the association between the inode and
856 * the yaffs_obj_t.
857 */
858 obj->my_inode = NULL;
859 yaffs_InodeToObjectLV(inode) = NULL;
860
861 /* If the object freeing was deferred, then the real
862 * free happens now.
863 * This should fix the inode inconsistency problem.
864 */
865 yaffs_handle_defered_free(obj);
866 }
867
868 #ifdef YAFFS_HAS_EVICT_INODE
869 /* yaffs_evict_inode combines into one operation what was previously done in
870 * yaffs_clear_inode() and yaffs_delete_inode()
871 *
872 */
873 static void yaffs_evict_inode( struct inode *inode)
874 {
875 yaffs_obj_t *obj;
876 yaffs_dev_t *dev;
877 int deleteme = 0;
878
879 obj = yaffs_InodeToObject(inode);
880
881 T(YAFFS_TRACE_OS,
882 (TSTR("yaffs_evict_inode: ino %d, count %d %s\n"), (int)inode->i_ino,
883 atomic_read(&inode->i_count),
884 obj ? "object exists" : "null object"));
885
886 if (!inode->i_nlink && !is_bad_inode(inode))
887 deleteme = 1;
888 truncate_inode_pages(&inode->i_data,0);
889 end_writeback(inode);
890
891 if(deleteme && obj){
892 dev = obj->my_dev;
893 yaffs_gross_lock(dev);
894 yaffs_del_obj(obj);
895 yaffs_gross_unlock(dev);
896 }
897 if (obj) {
898 dev = obj->my_dev;
899 yaffs_gross_lock(dev);
900 yaffs_unstitch_obj(inode,obj);
901 yaffs_gross_unlock(dev);
902 }
903
904
905 }
906 #else
907
908 /* clear is called to tell the fs to release any per-inode data it holds.
909 * The object might still exist on disk and is just being thrown out of the cache
910 * or else the object has actually been deleted and we're being called via
911 * the chain
912 * yaffs_delete_inode() -> clear_inode()->yaffs_clear_inode()
913 */
914
915 static void yaffs_clear_inode(struct inode *inode)
916 {
917 yaffs_obj_t *obj;
918 yaffs_dev_t *dev;
919
920 obj = yaffs_InodeToObject(inode);
921
922 T(YAFFS_TRACE_OS,
923 (TSTR("yaffs_clear_inode: ino %d, count %d %s\n"), (int)inode->i_ino,
924 atomic_read(&inode->i_count),
925 obj ? "object exists" : "null object"));
926
927 if (obj) {
928 dev = obj->my_dev;
929 yaffs_gross_lock(dev);
930 yaffs_unstitch_obj(inode,obj);
931 yaffs_gross_unlock(dev);
932 }
933
934 }
935
936 /* delete is called when the link count is zero and the inode
937 * is put (ie. nobody wants to know about it anymore, time to
938 * delete the file).
939 * NB Must call clear_inode()
940 */
941 static void yaffs_delete_inode(struct inode *inode)
942 {
943 yaffs_obj_t *obj = yaffs_InodeToObject(inode);
944 yaffs_dev_t *dev;
945
946 T(YAFFS_TRACE_OS,
947 (TSTR("yaffs_delete_inode: ino %d, count %d %s\n"), (int)inode->i_ino,
948 atomic_read(&inode->i_count),
949 obj ? "object exists" : "null object"));
950
951 if (obj) {
952 dev = obj->my_dev;
953 yaffs_gross_lock(dev);
954 yaffs_del_obj(obj);
955 yaffs_gross_unlock(dev);
956 }
957 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
958 truncate_inode_pages(&inode->i_data, 0);
959 #endif
960 clear_inode(inode);
961 }
962 #endif
963
964
965 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
966 static int yaffs_file_flush(struct file *file, fl_owner_t id)
967 #else
968 static int yaffs_file_flush(struct file *file)
969 #endif
970 {
971 yaffs_obj_t *obj = yaffs_dentry_to_obj(file->f_dentry);
972
973 yaffs_dev_t *dev = obj->my_dev;
974
975 T(YAFFS_TRACE_OS,
976 (TSTR("yaffs_file_flush object %d (%s)\n"), obj->obj_id,
977 obj->dirty ? "dirty" : "clean"));
978
979 yaffs_gross_lock(dev);
980
981 yaffs_flush_file(obj, 1, 0);
982
983 yaffs_gross_unlock(dev);
984
985 return 0;
986 }
987
988 static int yaffs_readpage_nolock(struct file *f, struct page *pg)
989 {
990 /* Lifted from jffs2 */
991
992 yaffs_obj_t *obj;
993 unsigned char *pg_buf;
994 int ret;
995
996 yaffs_dev_t *dev;
997
998 T(YAFFS_TRACE_OS,
999 (TSTR("yaffs_readpage_nolock at %08x, size %08x\n"),
1000 (unsigned)(pg->index << PAGE_CACHE_SHIFT),
1001 (unsigned)PAGE_CACHE_SIZE));
1002
1003 obj = yaffs_dentry_to_obj(f->f_dentry);
1004
1005 dev = obj->my_dev;
1006
1007 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1008 BUG_ON(!PageLocked(pg));
1009 #else
1010 if (!PageLocked(pg))
1011 PAGE_BUG(pg);
1012 #endif
1013
1014 pg_buf = kmap(pg);
1015 /* FIXME: Can kmap fail? */
1016
1017 yaffs_gross_lock(dev);
1018
1019 ret = yaffs_file_rd(obj, pg_buf,
1020 pg->index << PAGE_CACHE_SHIFT,
1021 PAGE_CACHE_SIZE);
1022
1023 yaffs_gross_unlock(dev);
1024
1025 if (ret >= 0)
1026 ret = 0;
1027
1028 if (ret) {
1029 ClearPageUptodate(pg);
1030 SetPageError(pg);
1031 } else {
1032 SetPageUptodate(pg);
1033 ClearPageError(pg);
1034 }
1035
1036 flush_dcache_page(pg);
1037 kunmap(pg);
1038
1039 T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage_nolock done\n")));
1040 return ret;
1041 }
1042
1043 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
1044 {
1045 int ret = yaffs_readpage_nolock(f, pg);
1046 UnlockPage(pg);
1047 return ret;
1048 }
1049
1050 static int yaffs_readpage(struct file *f, struct page *pg)
1051 {
1052 int ret;
1053
1054 T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage\n")));
1055 ret=yaffs_readpage_unlock(f, pg);
1056 T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage done\n")));
1057 return ret;
1058 }
1059
1060 /* writepage inspired by/stolen from smbfs */
1061
1062 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1063 static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
1064 #else
1065 static int yaffs_writepage(struct page *page)
1066 #endif
1067 {
1068 yaffs_dev_t *dev;
1069 struct address_space *mapping = page->mapping;
1070 struct inode *inode;
1071 unsigned long end_index;
1072 char *buffer;
1073 yaffs_obj_t *obj;
1074 int nWritten = 0;
1075 unsigned n_bytes;
1076 loff_t i_size;
1077
1078 if (!mapping)
1079 BUG();
1080 inode = mapping->host;
1081 if (!inode)
1082 BUG();
1083 i_size = i_size_read(inode);
1084
1085 end_index = i_size >> PAGE_CACHE_SHIFT;
1086
1087 if(page->index < end_index)
1088 n_bytes = PAGE_CACHE_SIZE;
1089 else {
1090 n_bytes = i_size & (PAGE_CACHE_SIZE -1);
1091
1092 if (page->index > end_index || !n_bytes) {
1093 T(YAFFS_TRACE_OS,
1094 (TSTR("yaffs_writepage at %08x, inode size = %08x!!!\n"),
1095 (unsigned)(page->index << PAGE_CACHE_SHIFT),
1096 (unsigned)inode->i_size));
1097 T(YAFFS_TRACE_OS,
1098 (TSTR(" -> don't care!!\n")));
1099
1100 zero_user_segment(page,0,PAGE_CACHE_SIZE);
1101 set_page_writeback(page);
1102 unlock_page(page);
1103 end_page_writeback(page);
1104 return 0;
1105 }
1106 }
1107
1108 if(n_bytes != PAGE_CACHE_SIZE)
1109 zero_user_segment(page,n_bytes,PAGE_CACHE_SIZE);
1110
1111 get_page(page);
1112
1113 buffer = kmap(page);
1114
1115 obj = yaffs_InodeToObject(inode);
1116 dev = obj->my_dev;
1117 yaffs_gross_lock(dev);
1118
1119 T(YAFFS_TRACE_OS,
1120 (TSTR("yaffs_writepage at %08x, size %08x\n"),
1121 (unsigned)(page->index << PAGE_CACHE_SHIFT), n_bytes));
1122 T(YAFFS_TRACE_OS,
1123 (TSTR("writepag0: obj = %05x, ino = %05x\n"),
1124 (int)obj->variant.file_variant.file_size, (int)inode->i_size));
1125
1126 nWritten = yaffs_wr_file(obj, buffer,
1127 page->index << PAGE_CACHE_SHIFT, n_bytes, 0);
1128
1129 yaffs_touch_super(dev);
1130
1131 T(YAFFS_TRACE_OS,
1132 (TSTR("writepag1: obj = %05x, ino = %05x\n"),
1133 (int)obj->variant.file_variant.file_size, (int)inode->i_size));
1134
1135 yaffs_gross_unlock(dev);
1136
1137 kunmap(page);
1138 set_page_writeback(page);
1139 unlock_page(page);
1140 end_page_writeback(page);
1141 put_page(page);
1142
1143 return (nWritten == n_bytes) ? 0 : -ENOSPC;
1144 }
1145
1146
1147 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
1148 static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
1149 loff_t pos, unsigned len, unsigned flags,
1150 struct page **pagep, void **fsdata)
1151 {
1152 struct page *pg = NULL;
1153 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
1154
1155 int ret = 0;
1156 int space_held = 0;
1157
1158 /* Get a page */
1159 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 28)
1160 pg = grab_cache_page_write_begin(mapping, index, flags);
1161 #else
1162 pg = __grab_cache_page(mapping, index);
1163 #endif
1164
1165 *pagep = pg;
1166 if (!pg) {
1167 ret = -ENOMEM;
1168 goto out;
1169 }
1170 T(YAFFS_TRACE_OS,
1171 (TSTR("start yaffs_write_begin index %d(%x) uptodate %d\n"),
1172 (int)index,(int)index,Page_Uptodate(pg) ? 1 : 0));
1173
1174 /* Get fs space */
1175 space_held = yaffs_hold_space(filp);
1176
1177 if (!space_held) {
1178 ret = -ENOSPC;
1179 goto out;
1180 }
1181
1182 /* Update page if required */
1183
1184 if (!Page_Uptodate(pg))
1185 ret = yaffs_readpage_nolock(filp, pg);
1186
1187 if (ret)
1188 goto out;
1189
1190 /* Happy path return */
1191 T(YAFFS_TRACE_OS, (TSTR("end yaffs_write_begin - ok\n")));
1192
1193 return 0;
1194
1195 out:
1196 T(YAFFS_TRACE_OS,
1197 (TSTR("end yaffs_write_begin fail returning %d\n"), ret));
1198 if (space_held)
1199 yaffs_release_space(filp);
1200 if (pg) {
1201 unlock_page(pg);
1202 page_cache_release(pg);
1203 }
1204 return ret;
1205 }
1206
1207 #else
1208
1209 static int yaffs_prepare_write(struct file *f, struct page *pg,
1210 unsigned offset, unsigned to)
1211 {
1212 T(YAFFS_TRACE_OS, (TSTR("yaffs_prepair_write\n")));
1213
1214 if (!Page_Uptodate(pg))
1215 return yaffs_readpage_nolock(f, pg);
1216 return 0;
1217 }
1218 #endif
1219
1220 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
1221 static int yaffs_write_end(struct file *filp, struct address_space *mapping,
1222 loff_t pos, unsigned len, unsigned copied,
1223 struct page *pg, void *fsdadata)
1224 {
1225 int ret = 0;
1226 void *addr, *kva;
1227 uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE - 1);
1228
1229 kva = kmap(pg);
1230 addr = kva + offset_into_page;
1231
1232 T(YAFFS_TRACE_OS,
1233 ("yaffs_write_end addr %p pos %x n_bytes %d\n",
1234 addr,(unsigned)pos, copied));
1235
1236 ret = yaffs_file_write(filp, addr, copied, &pos);
1237
1238 if (ret != copied) {
1239 T(YAFFS_TRACE_OS,
1240 (TSTR("yaffs_write_end not same size ret %d copied %d\n"),
1241 ret, copied));
1242 SetPageError(pg);
1243 } else {
1244 /* Nothing */
1245 }
1246
1247 kunmap(pg);
1248
1249 yaffs_release_space(filp);
1250 unlock_page(pg);
1251 page_cache_release(pg);
1252 return ret;
1253 }
1254 #else
1255
1256 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
1257 unsigned to)
1258 {
1259 void *addr, *kva;
1260
1261 loff_t pos = (((loff_t) pg->index) << PAGE_CACHE_SHIFT) + offset;
1262 int n_bytes = to - offset;
1263 int nWritten;
1264
1265 unsigned spos = pos;
1266 unsigned saddr;
1267
1268 kva = kmap(pg);
1269 addr = kva + offset;
1270
1271 saddr = (unsigned) addr;
1272
1273 T(YAFFS_TRACE_OS,
1274 (TSTR("yaffs_commit_write addr %x pos %x n_bytes %d\n"),
1275 saddr, spos, n_bytes));
1276
1277 nWritten = yaffs_file_write(f, addr, n_bytes, &pos);
1278
1279 if (nWritten != n_bytes) {
1280 T(YAFFS_TRACE_OS,
1281 (TSTR("yaffs_commit_write not same size nWritten %d n_bytes %d\n"),
1282 nWritten, n_bytes));
1283 SetPageError(pg);
1284 } else {
1285 /* Nothing */
1286 }
1287
1288 kunmap(pg);
1289
1290 T(YAFFS_TRACE_OS,
1291 (TSTR("yaffs_commit_write returning %d\n"),
1292 nWritten == n_bytes ? 0 : nWritten));
1293
1294 return nWritten == n_bytes ? 0 : nWritten;
1295 }
1296 #endif
1297
1298
1299 static void yaffs_fill_inode_from_obj(struct inode *inode, yaffs_obj_t *obj)
1300 {
1301 if (inode && obj) {
1302
1303
1304 /* Check mode against the variant type and attempt to repair if broken. */
1305 __u32 mode = obj->yst_mode;
1306 switch (obj->variant_type) {
1307 case YAFFS_OBJECT_TYPE_FILE:
1308 if (!S_ISREG(mode)) {
1309 obj->yst_mode &= ~S_IFMT;
1310 obj->yst_mode |= S_IFREG;
1311 }
1312
1313 break;
1314 case YAFFS_OBJECT_TYPE_SYMLINK:
1315 if (!S_ISLNK(mode)) {
1316 obj->yst_mode &= ~S_IFMT;
1317 obj->yst_mode |= S_IFLNK;
1318 }
1319
1320 break;
1321 case YAFFS_OBJECT_TYPE_DIRECTORY:
1322 if (!S_ISDIR(mode)) {
1323 obj->yst_mode &= ~S_IFMT;
1324 obj->yst_mode |= S_IFDIR;
1325 }
1326
1327 break;
1328 case YAFFS_OBJECT_TYPE_UNKNOWN:
1329 case YAFFS_OBJECT_TYPE_HARDLINK:
1330 case YAFFS_OBJECT_TYPE_SPECIAL:
1331 default:
1332 /* TODO? */
1333 break;
1334 }
1335
1336 inode->i_flags |= S_NOATIME;
1337
1338 inode->i_ino = obj->obj_id;
1339 inode->i_mode = obj->yst_mode;
1340 inode->i_uid = obj->yst_uid;
1341 inode->i_gid = obj->yst_gid;
1342 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
1343 inode->i_blksize = inode->i_sb->s_blocksize;
1344 #endif
1345 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1346
1347 inode->i_rdev = old_decode_dev(obj->yst_rdev);
1348 inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
1349 inode->i_atime.tv_nsec = 0;
1350 inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
1351 inode->i_mtime.tv_nsec = 0;
1352 inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
1353 inode->i_ctime.tv_nsec = 0;
1354 #else
1355 inode->i_rdev = obj->yst_rdev;
1356 inode->i_atime = obj->yst_atime;
1357 inode->i_mtime = obj->yst_mtime;
1358 inode->i_ctime = obj->yst_ctime;
1359 #endif
1360 inode->i_size = yaffs_get_obj_length(obj);
1361 inode->i_blocks = (inode->i_size + 511) >> 9;
1362
1363 inode->i_nlink = yaffs_get_obj_link_count(obj);
1364
1365 T(YAFFS_TRACE_OS,
1366 (TSTR("yaffs_fill_inode mode %x uid %d gid %d size %d count %d\n"),
1367 inode->i_mode, inode->i_uid, inode->i_gid,
1368 (int)inode->i_size, atomic_read(&inode->i_count)));
1369
1370 switch (obj->yst_mode & S_IFMT) {
1371 default: /* fifo, device or socket */
1372 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1373 init_special_inode(inode, obj->yst_mode,
1374 old_decode_dev(obj->yst_rdev));
1375 #else
1376 init_special_inode(inode, obj->yst_mode,
1377 (dev_t) (obj->yst_rdev));
1378 #endif
1379 break;
1380 case S_IFREG: /* file */
1381 inode->i_op = &yaffs_file_inode_operations;
1382 inode->i_fop = &yaffs_file_operations;
1383 inode->i_mapping->a_ops =
1384 &yaffs_file_address_operations;
1385 break;
1386 case S_IFDIR: /* directory */
1387 inode->i_op = &yaffs_dir_inode_operations;
1388 inode->i_fop = &yaffs_dir_operations;
1389 break;
1390 case S_IFLNK: /* symlink */
1391 inode->i_op = &yaffs_symlink_inode_operations;
1392 break;
1393 }
1394
1395 yaffs_InodeToObjectLV(inode) = obj;
1396
1397 obj->my_inode = inode;
1398
1399 } else {
1400 T(YAFFS_TRACE_OS,
1401 (TSTR("yaffs_FileInode invalid parameters\n")));
1402 }
1403
1404 }
1405
1406 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
1407 yaffs_obj_t *obj)
1408 {
1409 struct inode *inode;
1410
1411 if (!sb) {
1412 T(YAFFS_TRACE_OS,
1413 (TSTR("yaffs_get_inode for NULL super_block!!\n")));
1414 return NULL;
1415
1416 }
1417
1418 if (!obj) {
1419 T(YAFFS_TRACE_OS,
1420 (TSTR("yaffs_get_inode for NULL object!!\n")));
1421 return NULL;
1422
1423 }
1424
1425 T(YAFFS_TRACE_OS,
1426 (TSTR("yaffs_get_inode for object %d\n"), obj->obj_id));
1427
1428 inode = Y_IGET(sb, obj->obj_id);
1429 if (IS_ERR(inode))
1430 return NULL;
1431
1432 /* NB Side effect: iget calls back to yaffs_read_inode(). */
1433 /* iget also increments the inode's i_count */
1434 /* NB You can't be holding grossLock or deadlock will happen! */
1435
1436 return inode;
1437 }
1438
1439 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
1440 loff_t *pos)
1441 {
1442 yaffs_obj_t *obj;
1443 int nWritten, ipos;
1444 struct inode *inode;
1445 yaffs_dev_t *dev;
1446
1447 obj = yaffs_dentry_to_obj(f->f_dentry);
1448
1449 dev = obj->my_dev;
1450
1451 yaffs_gross_lock(dev);
1452
1453 inode = f->f_dentry->d_inode;
1454
1455 if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
1456 ipos = inode->i_size;
1457 else
1458 ipos = *pos;
1459
1460 if (!obj)
1461 T(YAFFS_TRACE_OS,
1462 (TSTR("yaffs_file_write: hey obj is null!\n")));
1463 else
1464 T(YAFFS_TRACE_OS,
1465 (TSTR("yaffs_file_write about to write writing %u(%x) bytes"
1466 "to object %d at %d(%x)\n"),
1467 (unsigned) n, (unsigned) n, obj->obj_id, ipos,ipos));
1468
1469 nWritten = yaffs_wr_file(obj, buf, ipos, n, 0);
1470
1471 yaffs_touch_super(dev);
1472
1473 T(YAFFS_TRACE_OS,
1474 (TSTR("yaffs_file_write: %d(%x) bytes written\n"),
1475 (unsigned )n,(unsigned)n));
1476
1477 if (nWritten > 0) {
1478 ipos += nWritten;
1479 *pos = ipos;
1480 if (ipos > inode->i_size) {
1481 inode->i_size = ipos;
1482 inode->i_blocks = (ipos + 511) >> 9;
1483
1484 T(YAFFS_TRACE_OS,
1485 (TSTR("yaffs_file_write size updated to %d bytes, "
1486 "%d blocks\n"),
1487 ipos, (int)(inode->i_blocks)));
1488 }
1489
1490 }
1491 yaffs_gross_unlock(dev);
1492 return (nWritten == 0) && (n > 0) ? -ENOSPC : nWritten;
1493 }
1494
1495 /* Space holding and freeing is done to ensure we have space available for write_begin/end */
1496 /* For now we just assume few parallel writes and check against a small number. */
1497 /* Todo: need to do this with a counter to handle parallel reads better */
1498
1499 static ssize_t yaffs_hold_space(struct file *f)
1500 {
1501 yaffs_obj_t *obj;
1502 yaffs_dev_t *dev;
1503
1504 int n_free_chunks;
1505
1506
1507 obj = yaffs_dentry_to_obj(f->f_dentry);
1508
1509 dev = obj->my_dev;
1510
1511 yaffs_gross_lock(dev);
1512
1513 n_free_chunks = yaffs_get_n_free_chunks(dev);
1514
1515 yaffs_gross_unlock(dev);
1516
1517 return (n_free_chunks > 20) ? 1 : 0;
1518 }
1519
1520 static void yaffs_release_space(struct file *f)
1521 {
1522 yaffs_obj_t *obj;
1523 yaffs_dev_t *dev;
1524
1525
1526 obj = yaffs_dentry_to_obj(f->f_dentry);
1527
1528 dev = obj->my_dev;
1529
1530 yaffs_gross_lock(dev);
1531
1532
1533 yaffs_gross_unlock(dev);
1534 }
1535
1536
1537 static loff_t yaffs_dir_llseek(struct file *file, loff_t offset, int origin)
1538 {
1539 long long retval;
1540
1541 lock_kernel();
1542
1543 switch (origin){
1544 case 2:
1545 offset += i_size_read(file->f_path.dentry->d_inode);
1546 break;
1547 case 1:
1548 offset += file->f_pos;
1549 }
1550 retval = -EINVAL;
1551
1552 if (offset >= 0){
1553 if (offset != file->f_pos)
1554 file->f_pos = offset;
1555
1556 retval = offset;
1557 }
1558 unlock_kernel();
1559 return retval;
1560 }
1561
1562
1563 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
1564 {
1565 yaffs_obj_t *obj;
1566 yaffs_dev_t *dev;
1567 struct yaffs_SearchContext *sc;
1568 struct inode *inode = f->f_dentry->d_inode;
1569 unsigned long offset, curoffs;
1570 yaffs_obj_t *l;
1571 int retVal = 0;
1572
1573 char name[YAFFS_MAX_NAME_LENGTH + 1];
1574
1575 obj = yaffs_dentry_to_obj(f->f_dentry);
1576 dev = obj->my_dev;
1577
1578 yaffs_gross_lock(dev);
1579
1580 yaffs_dev_to_lc(dev)->readdirProcess = current;
1581
1582 offset = f->f_pos;
1583
1584 sc = yaffs_NewSearch(obj);
1585 if(!sc){
1586 retVal = -ENOMEM;
1587 goto out;
1588 }
1589
1590 T(YAFFS_TRACE_OS, (TSTR("yaffs_readdir: starting at %d\n"), (int)offset));
1591
1592 if (offset == 0) {
1593 T(YAFFS_TRACE_OS,
1594 (TSTR("yaffs_readdir: entry . ino %d \n"),
1595 (int)inode->i_ino));
1596 yaffs_gross_unlock(dev);
1597 if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0){
1598 yaffs_gross_lock(dev);
1599 goto out;
1600 }
1601 yaffs_gross_lock(dev);
1602 offset++;
1603 f->f_pos++;
1604 }
1605 if (offset == 1) {
1606 T(YAFFS_TRACE_OS,
1607 (TSTR("yaffs_readdir: entry .. ino %d \n"),
1608 (int)f->f_dentry->d_parent->d_inode->i_ino));
1609 yaffs_gross_unlock(dev);
1610 if (filldir(dirent, "..", 2, offset,
1611 f->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0){
1612 yaffs_gross_lock(dev);
1613 goto out;
1614 }
1615 yaffs_gross_lock(dev);
1616 offset++;
1617 f->f_pos++;
1618 }
1619
1620 curoffs = 1;
1621
1622 /* If the directory has changed since the open or last call to
1623 readdir, rewind to after the 2 canned entries. */
1624 if (f->f_version != inode->i_version) {
1625 offset = 2;
1626 f->f_pos = offset;
1627 f->f_version = inode->i_version;
1628 }
1629
1630 while(sc->nextReturn){
1631 curoffs++;
1632 l = sc->nextReturn;
1633 if (curoffs >= offset) {
1634 int this_inode = yaffs_get_obj_inode(l);
1635 int this_type = yaffs_get_obj_type(l);
1636
1637 yaffs_get_obj_name(l, name,
1638 YAFFS_MAX_NAME_LENGTH + 1);
1639 T(YAFFS_TRACE_OS,
1640 (TSTR("yaffs_readdir: %s inode %d\n"),
1641 name, yaffs_get_obj_inode(l)));
1642
1643 yaffs_gross_unlock(dev);
1644
1645 if (filldir(dirent,
1646 name,
1647 strlen(name),
1648 offset,
1649 this_inode,
1650 this_type) < 0){
1651 yaffs_gross_lock(dev);
1652 goto out;
1653 }
1654
1655 yaffs_gross_lock(dev);
1656
1657 offset++;
1658 f->f_pos++;
1659 }
1660 yaffs_search_advance(sc);
1661 }
1662
1663 out:
1664 yaffs_search_end(sc);
1665 yaffs_dev_to_lc(dev)->readdirProcess = NULL;
1666 yaffs_gross_unlock(dev);
1667
1668 return retVal;
1669 }
1670
1671
1672
1673 /*
1674 * File creation. Allocate an inode, and we're done..
1675 */
1676
1677 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
1678 #define YCRED(x) x
1679 #else
1680 #define YCRED(x) (x->cred)
1681 #endif
1682
1683 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1684 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1685 dev_t rdev)
1686 #else
1687 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1688 int rdev)
1689 #endif
1690 {
1691 struct inode *inode;
1692
1693 yaffs_obj_t *obj = NULL;
1694 yaffs_dev_t *dev;
1695
1696 yaffs_obj_t *parent = yaffs_InodeToObject(dir);
1697
1698 int error = -ENOSPC;
1699 uid_t uid = YCRED(current)->fsuid;
1700 gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
1701
1702 if ((dir->i_mode & S_ISGID) && S_ISDIR(mode))
1703 mode |= S_ISGID;
1704
1705 if (parent) {
1706 T(YAFFS_TRACE_OS,
1707 (TSTR("yaffs_mknod: parent object %d type %d\n"),
1708 parent->obj_id, parent->variant_type));
1709 } else {
1710 T(YAFFS_TRACE_OS,
1711 (TSTR("yaffs_mknod: could not get parent object\n")));
1712 return -EPERM;
1713 }
1714
1715 T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making oject for %s, "
1716 "mode %x dev %x\n"),
1717 dentry->d_name.name, mode, rdev));
1718
1719 dev = parent->my_dev;
1720
1721 yaffs_gross_lock(dev);
1722
1723 switch (mode & S_IFMT) {
1724 default:
1725 /* Special (socket, fifo, device...) */
1726 T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making special\n")));
1727 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1728 obj = yaffs_create_special(parent, dentry->d_name.name, mode, uid,
1729 gid, old_encode_dev(rdev));
1730 #else
1731 obj = yaffs_create_special(parent, dentry->d_name.name, mode, uid,
1732 gid, rdev);
1733 #endif
1734 break;
1735 case S_IFREG: /* file */
1736 T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making file\n")));
1737 obj = yaffs_create_file(parent, dentry->d_name.name, mode, uid,
1738 gid);
1739 break;
1740 case S_IFDIR: /* directory */
1741 T(YAFFS_TRACE_OS,
1742 (TSTR("yaffs_mknod: making directory\n")));
1743 obj = yaffs_create_dir(parent, dentry->d_name.name, mode,
1744 uid, gid);
1745 break;
1746 case S_IFLNK: /* symlink */
1747 T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making symlink\n")));
1748 obj = NULL; /* Do we ever get here? */
1749 break;
1750 }
1751
1752 /* Can not call yaffs_get_inode() with gross lock held */
1753 yaffs_gross_unlock(dev);
1754
1755 if (obj) {
1756 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
1757 d_instantiate(dentry, inode);
1758 update_dir_time(dir);
1759 T(YAFFS_TRACE_OS,
1760 (TSTR("yaffs_mknod created object %d count = %d\n"),
1761 obj->obj_id, atomic_read(&inode->i_count)));
1762 error = 0;
1763 yaffs_fill_inode_from_obj(dir,parent);
1764 } else {
1765 T(YAFFS_TRACE_OS,
1766 (TSTR("yaffs_mknod failed making object\n")));
1767 error = -ENOMEM;
1768 }
1769
1770 return error;
1771 }
1772
1773 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1774 {
1775 int retVal;
1776 T(YAFFS_TRACE_OS, (TSTR("yaffs_mkdir\n")));
1777 retVal = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
1778 return retVal;
1779 }
1780
1781 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1782 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
1783 struct nameidata *n)
1784 #else
1785 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
1786 #endif
1787 {
1788 T(YAFFS_TRACE_OS,(TSTR("yaffs_create\n")));
1789 return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
1790 }
1791
1792 static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
1793 {
1794 int retVal;
1795
1796 yaffs_dev_t *dev;
1797 yaffs_obj_t *obj;
1798
1799 T(YAFFS_TRACE_OS,
1800 (TSTR("yaffs_unlink %d:%s\n"),
1801 (int)(dir->i_ino),
1802 dentry->d_name.name));
1803 obj = yaffs_InodeToObject(dir);
1804 dev = obj->my_dev;
1805
1806 yaffs_gross_lock(dev);
1807
1808 retVal = yaffs_unlinker(obj, dentry->d_name.name);
1809
1810 if (retVal == YAFFS_OK) {
1811 dentry->d_inode->i_nlink--;
1812 dir->i_version++;
1813 yaffs_gross_unlock(dev);
1814 mark_inode_dirty(dentry->d_inode);
1815 update_dir_time(dir);
1816 return 0;
1817 }
1818 yaffs_gross_unlock(dev);
1819 return -ENOTEMPTY;
1820 }
1821
1822 /*
1823 * Create a link...
1824 */
1825 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
1826 struct dentry *dentry)
1827 {
1828 struct inode *inode = old_dentry->d_inode;
1829 yaffs_obj_t *obj = NULL;
1830 yaffs_obj_t *link = NULL;
1831 yaffs_dev_t *dev;
1832
1833 T(YAFFS_TRACE_OS, (TSTR("yaffs_link\n")));
1834
1835 obj = yaffs_InodeToObject(inode);
1836 dev = obj->my_dev;
1837
1838 yaffs_gross_lock(dev);
1839
1840 if (!S_ISDIR(inode->i_mode)) /* Don't link directories */
1841 link = yaffs_link_obj(yaffs_InodeToObject(dir), dentry->d_name.name,
1842 obj);
1843
1844 if (link) {
1845 old_dentry->d_inode->i_nlink = yaffs_get_obj_link_count(obj);
1846 d_instantiate(dentry, old_dentry->d_inode);
1847 atomic_inc(&old_dentry->d_inode->i_count);
1848 T(YAFFS_TRACE_OS,
1849 (TSTR("yaffs_link link count %d i_count %d\n"),
1850 old_dentry->d_inode->i_nlink,
1851 atomic_read(&old_dentry->d_inode->i_count)));
1852 }
1853
1854 yaffs_gross_unlock(dev);
1855
1856 if (link){
1857 update_dir_time(dir);
1858 return 0;
1859 }
1860
1861 return -EPERM;
1862 }
1863
1864 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
1865 const char *symname)
1866 {
1867 yaffs_obj_t *obj;
1868 yaffs_dev_t *dev;
1869 uid_t uid = YCRED(current)->fsuid;
1870 gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
1871
1872 T(YAFFS_TRACE_OS, (TSTR("yaffs_symlink\n")));
1873
1874 dev = yaffs_InodeToObject(dir)->my_dev;
1875 yaffs_gross_lock(dev);
1876 obj = yaffs_create_symlink(yaffs_InodeToObject(dir), dentry->d_name.name,
1877 S_IFLNK | S_IRWXUGO, uid, gid, symname);
1878 yaffs_gross_unlock(dev);
1879
1880 if (obj) {
1881 struct inode *inode;
1882
1883 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
1884 d_instantiate(dentry, inode);
1885 update_dir_time(dir);
1886 T(YAFFS_TRACE_OS, (TSTR("symlink created OK\n")));
1887 return 0;
1888 } else {
1889 T(YAFFS_TRACE_OS, (TSTR("symlink not created\n")));
1890 }
1891
1892 return -ENOMEM;
1893 }
1894
1895 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34))
1896 static int yaffs_sync_object(struct file *file, int datasync)
1897 #else
1898 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
1899 int datasync)
1900 #endif
1901 {
1902
1903 yaffs_obj_t *obj;
1904 yaffs_dev_t *dev;
1905 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34))
1906 struct dentry *dentry = file->f_path.dentry;
1907 #endif
1908
1909 obj = yaffs_dentry_to_obj(dentry);
1910
1911 dev = obj->my_dev;
1912
1913 T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
1914 (TSTR("yaffs_sync_object\n")));
1915 yaffs_gross_lock(dev);
1916 yaffs_flush_file(obj, 1, datasync);
1917 yaffs_gross_unlock(dev);
1918 return 0;
1919 }
1920
1921 /*
1922 * The VFS layer already does all the dentry stuff for rename.
1923 *
1924 * NB: POSIX says you can rename an object over an old object of the same name
1925 */
1926 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
1927 struct inode *new_dir, struct dentry *new_dentry)
1928 {
1929 yaffs_dev_t *dev;
1930 int retVal = YAFFS_FAIL;
1931 yaffs_obj_t *target;
1932
1933 T(YAFFS_TRACE_OS, (TSTR("yaffs_rename\n")));
1934 dev = yaffs_InodeToObject(old_dir)->my_dev;
1935
1936 yaffs_gross_lock(dev);
1937
1938 /* Check if the target is an existing directory that is not empty. */
1939 target = yaffs_find_by_name(yaffs_InodeToObject(new_dir),
1940 new_dentry->d_name.name);
1941
1942
1943
1944 if (target && target->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY &&
1945 !ylist_empty(&target->variant.dir_variant.children)) {
1946
1947 T(YAFFS_TRACE_OS, (TSTR("target is non-empty dir\n")));
1948
1949 retVal = YAFFS_FAIL;
1950 } else {
1951 /* Now does unlinking internally using shadowing mechanism */
1952 T(YAFFS_TRACE_OS, (TSTR("calling yaffs_rename_obj\n")));
1953
1954 retVal = yaffs_rename_obj(yaffs_InodeToObject(old_dir),
1955 old_dentry->d_name.name,
1956 yaffs_InodeToObject(new_dir),
1957 new_dentry->d_name.name);
1958 }
1959 yaffs_gross_unlock(dev);
1960
1961 if (retVal == YAFFS_OK) {
1962 if (target) {
1963 new_dentry->d_inode->i_nlink--;
1964 mark_inode_dirty(new_dentry->d_inode);
1965 }
1966
1967 update_dir_time(old_dir);
1968 if(old_dir != new_dir)
1969 update_dir_time(new_dir);
1970 return 0;
1971 } else {
1972 return -ENOTEMPTY;
1973 }
1974 }
1975
1976 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
1977 {
1978 struct inode *inode = dentry->d_inode;
1979 int error = 0;
1980 yaffs_dev_t *dev;
1981
1982 T(YAFFS_TRACE_OS,
1983 (TSTR("yaffs_setattr of object %d\n"),
1984 yaffs_InodeToObject(inode)->obj_id));
1985
1986 /* Fail if a requested resize >= 2GB */
1987 if (attr->ia_valid & ATTR_SIZE &&
1988 (attr->ia_size >> 31))
1989 error = -EINVAL;
1990
1991 if (error == 0)
1992 error = inode_change_ok(inode, attr);
1993 if (error == 0) {
1994 int result;
1995 if (!error){
1996 error = yaffs_vfs_setattr(inode, attr);
1997 T(YAFFS_TRACE_OS,(TSTR("inode_setattr called\n")));
1998 if (attr->ia_valid & ATTR_SIZE){
1999 yaffs_vfs_setsize(inode,attr->ia_size);
2000 inode->i_blocks = (inode->i_size + 511) >> 9;
2001 }
2002 }
2003 dev = yaffs_InodeToObject(inode)->my_dev;
2004 if (attr->ia_valid & ATTR_SIZE){
2005 T(YAFFS_TRACE_OS,(TSTR("resize to %d(%x)\n"),
2006 (int)(attr->ia_size),(int)(attr->ia_size)));
2007 }
2008 yaffs_gross_lock(dev);
2009 result = yaffs_set_attribs(yaffs_InodeToObject(inode), attr);
2010 if(result == YAFFS_OK) {
2011 error = 0;
2012 } else {
2013 error = -EPERM;
2014 }
2015 yaffs_gross_unlock(dev);
2016
2017 }
2018
2019 T(YAFFS_TRACE_OS,
2020 (TSTR("yaffs_setattr done returning %d\n"),error));
2021
2022 return error;
2023 }
2024
2025 #ifdef CONFIG_YAFFS_XATTR
2026 int yaffs_setxattr(struct dentry *dentry, const char *name,
2027 const void *value, size_t size, int flags)
2028 {
2029 struct inode *inode = dentry->d_inode;
2030 int error = 0;
2031 yaffs_dev_t *dev;
2032 yaffs_obj_t *obj = yaffs_InodeToObject(inode);
2033
2034 T(YAFFS_TRACE_OS,
2035 (TSTR("yaffs_setxattr of object %d\n"),
2036 obj->obj_id));
2037
2038
2039 if (error == 0) {
2040 int result;
2041 dev = obj->my_dev;
2042 yaffs_gross_lock(dev);
2043 result = yaffs_set_xattrib(obj, name, value, size, flags);
2044 if(result == YAFFS_OK)
2045 error = 0;
2046 else if(result < 0)
2047 error = result;
2048 yaffs_gross_unlock(dev);
2049
2050 }
2051 T(YAFFS_TRACE_OS,
2052 (TSTR("yaffs_setxattr done returning %d\n"),error));
2053
2054 return error;
2055 }
2056
2057
2058 ssize_t yaffs_getxattr(struct dentry *dentry, const char *name, void *buff,
2059 size_t size)
2060 {
2061 struct inode *inode = dentry->d_inode;
2062 int error = 0;
2063 yaffs_dev_t *dev;
2064 yaffs_obj_t *obj = yaffs_InodeToObject(inode);
2065
2066 T(YAFFS_TRACE_OS,
2067 (TSTR("yaffs_getxattr \"%s\" from object %d\n"),
2068 name, obj->obj_id));
2069
2070 if (error == 0) {
2071 dev = obj->my_dev;
2072 yaffs_gross_lock(dev);
2073 error = yaffs_get_xattrib(obj, name, buff, size);
2074 yaffs_gross_unlock(dev);
2075
2076 }
2077 T(YAFFS_TRACE_OS,
2078 (TSTR("yaffs_getxattr done returning %d\n"),error));
2079
2080 return error;
2081 }
2082
2083 int yaffs_removexattr(struct dentry *dentry, const char *name)
2084 {
2085 struct inode *inode = dentry->d_inode;
2086 int error = 0;
2087 yaffs_dev_t *dev;
2088 yaffs_obj_t *obj = yaffs_InodeToObject(inode);
2089
2090 T(YAFFS_TRACE_OS,
2091 (TSTR("yaffs_removexattr of object %d\n"),
2092 obj->obj_id));
2093
2094
2095 if (error == 0) {
2096 int result;
2097 dev = obj->my_dev;
2098 yaffs_gross_lock(dev);
2099 result = yaffs_remove_xattrib(obj, name);
2100 if(result == YAFFS_OK)
2101 error = 0;
2102 else if(result < 0)
2103 error = result;
2104 yaffs_gross_unlock(dev);
2105
2106 }
2107 T(YAFFS_TRACE_OS,
2108 (TSTR("yaffs_removexattr done returning %d\n"),error));
2109
2110 return error;
2111 }
2112
2113 ssize_t yaffs_listxattr(struct dentry *dentry, char *buff, size_t size)
2114 {
2115 struct inode *inode = dentry->d_inode;
2116 int error = 0;
2117 yaffs_dev_t *dev;
2118 yaffs_obj_t *obj = yaffs_InodeToObject(inode);
2119
2120 T(YAFFS_TRACE_OS,
2121 (TSTR("yaffs_listxattr of object %d\n"),
2122 obj->obj_id));
2123
2124
2125 if (error == 0) {
2126 dev = obj->my_dev;
2127 yaffs_gross_lock(dev);
2128 error = yaffs_list_xattrib(obj, buff, size);
2129 yaffs_gross_unlock(dev);
2130
2131 }
2132 T(YAFFS_TRACE_OS,
2133 (TSTR("yaffs_listxattr done returning %d\n"),error));
2134
2135 return error;
2136 }
2137
2138 #endif
2139
2140
2141 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2142 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
2143 {
2144 yaffs_dev_t *dev = yaffs_dentry_to_obj(dentry)->my_dev;
2145 struct super_block *sb = dentry->d_sb;
2146 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2147 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
2148 {
2149 yaffs_dev_t *dev = yaffs_SuperToDevice(sb);
2150 #else
2151 static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
2152 {
2153 yaffs_dev_t *dev = yaffs_SuperToDevice(sb);
2154 #endif
2155
2156 T(YAFFS_TRACE_OS, (TSTR("yaffs_statfs\n")));
2157
2158 yaffs_gross_lock(dev);
2159
2160 buf->f_type = YAFFS_MAGIC;
2161 buf->f_bsize = sb->s_blocksize;
2162 buf->f_namelen = 255;
2163
2164 if (dev->data_bytes_per_chunk & (dev->data_bytes_per_chunk - 1)) {
2165 /* Do this if chunk size is not a power of 2 */
2166
2167 uint64_t bytesInDev;
2168 uint64_t bytesFree;
2169
2170 bytesInDev = ((uint64_t)((dev->param.end_block - dev->param.start_block + 1))) *
2171 ((uint64_t)(dev->param.chunks_per_block * dev->data_bytes_per_chunk));
2172
2173 do_div(bytesInDev, sb->s_blocksize); /* bytesInDev becomes the number of blocks */
2174 buf->f_blocks = bytesInDev;
2175
2176 bytesFree = ((uint64_t)(yaffs_get_n_free_chunks(dev))) *
2177 ((uint64_t)(dev->data_bytes_per_chunk));
2178
2179 do_div(bytesFree, sb->s_blocksize);
2180
2181 buf->f_bfree = bytesFree;
2182
2183 } else if (sb->s_blocksize > dev->data_bytes_per_chunk) {
2184
2185 buf->f_blocks =
2186 (dev->param.end_block - dev->param.start_block + 1) *
2187 dev->param.chunks_per_block /
2188 (sb->s_blocksize / dev->data_bytes_per_chunk);
2189 buf->f_bfree =
2190 yaffs_get_n_free_chunks(dev) /
2191 (sb->s_blocksize / dev->data_bytes_per_chunk);
2192 } else {
2193 buf->f_blocks =
2194 (dev->param.end_block - dev->param.start_block + 1) *
2195 dev->param.chunks_per_block *
2196 (dev->data_bytes_per_chunk / sb->s_blocksize);
2197
2198 buf->f_bfree =
2199 yaffs_get_n_free_chunks(dev) *
2200 (dev->data_bytes_per_chunk / sb->s_blocksize);
2201 }
2202
2203 buf->f_files = 0;
2204 buf->f_ffree = 0;
2205 buf->f_bavail = buf->f_bfree;
2206
2207 yaffs_gross_unlock(dev);
2208 return 0;
2209 }
2210
2211
2212
2213 static void yaffs_flush_inodes(struct super_block *sb)
2214 {
2215 struct inode *iptr;
2216 yaffs_obj_t *obj;
2217
2218 list_for_each_entry(iptr,&sb->s_inodes, i_sb_list){
2219 obj = yaffs_InodeToObject(iptr);
2220 if(obj){
2221 T(YAFFS_TRACE_OS, (TSTR("flushing obj %d\n"),
2222 obj->obj_id));
2223 yaffs_flush_file(obj,1,0);
2224 }
2225 }
2226 }
2227
2228
2229 static void yaffs_flush_super(struct super_block *sb, int do_checkpoint)
2230 {
2231 yaffs_dev_t *dev = yaffs_SuperToDevice(sb);
2232 if(!dev)
2233 return;
2234
2235 yaffs_flush_inodes(sb);
2236 yaffs_update_dirty_dirs(dev);
2237 yaffs_flush_whole_cache(dev);
2238 if(do_checkpoint)
2239 yaffs_checkpoint_save(dev);
2240 }
2241
2242
2243 static unsigned yaffs_bg_gc_urgency(yaffs_dev_t *dev)
2244 {
2245 unsigned erasedChunks = dev->n_erased_blocks * dev->param.chunks_per_block;
2246 struct yaffs_LinuxContext *context = yaffs_dev_to_lc(dev);
2247 unsigned scatteredFree = 0; /* Free chunks not in an erased block */
2248
2249 if(erasedChunks < dev->n_free_chunks)
2250 scatteredFree = (dev->n_free_chunks - erasedChunks);
2251
2252 if(!context->bgRunning)
2253 return 0;
2254 else if(scatteredFree < (dev->param.chunks_per_block * 2))
2255 return 0;
2256 else if(erasedChunks > dev->n_free_chunks/2)
2257 return 0;
2258 else if(erasedChunks > dev->n_free_chunks/4)
2259 return 1;
2260 else
2261 return 2;
2262 }
2263
2264 static int yaffs_do_sync_fs(struct super_block *sb,
2265 int request_checkpoint)
2266 {
2267
2268 yaffs_dev_t *dev = yaffs_SuperToDevice(sb);
2269 unsigned int oneshot_checkpoint = (yaffs_auto_checkpoint & 4);
2270 unsigned gc_urgent = yaffs_bg_gc_urgency(dev);
2271 int do_checkpoint;
2272
2273 T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
2274 (TSTR("yaffs_do_sync_fs: gc-urgency %d %s %s%s\n"),
2275 gc_urgent,
2276 sb->s_dirt ? "dirty" : "clean",
2277 request_checkpoint ? "checkpoint requested" : "no checkpoint",
2278 oneshot_checkpoint ? " one-shot" : "" ));
2279
2280 yaffs_gross_lock(dev);
2281 do_checkpoint = ((request_checkpoint && !gc_urgent) ||
2282 oneshot_checkpoint) &&
2283 !dev->is_checkpointed;
2284
2285 if (sb->s_dirt || do_checkpoint) {
2286 yaffs_flush_super(sb, !dev->is_checkpointed && do_checkpoint);
2287 sb->s_dirt = 0;
2288 if(oneshot_checkpoint)
2289 yaffs_auto_checkpoint &= ~4;
2290 }
2291 yaffs_gross_unlock(dev);
2292
2293 return 0;
2294 }
2295
2296 /*
2297 * yaffs background thread functions .
2298 * yaffs_bg_thread_fn() the thread function
2299 * yaffs_bg_start() launches the background thread.
2300 * yaffs_bg_stop() cleans up the background thread.
2301 *
2302 * NB:
2303 * The thread should only run after the yaffs is initialised
2304 * The thread should be stopped before yaffs is unmounted.
2305 * The thread should not do any writing while the fs is in read only.
2306 */
2307
2308 #ifdef YAFFS_COMPILE_BACKGROUND
2309
2310 void yaffs_background_waker(unsigned long data)
2311 {
2312 wake_up_process((struct task_struct *)data);
2313 }
2314
2315 static int yaffs_bg_thread_fn(void *data)
2316 {
2317 yaffs_dev_t *dev = (yaffs_dev_t *)data;
2318 struct yaffs_LinuxContext *context = yaffs_dev_to_lc(dev);
2319 unsigned long now = jiffies;
2320 unsigned long next_dir_update = now;
2321 unsigned long next_gc = now;
2322 unsigned long expires;
2323 unsigned int urgency;
2324
2325 int gcResult;
2326 struct timer_list timer;
2327
2328 T(YAFFS_TRACE_BACKGROUND,
2329 (TSTR("yaffs_background starting for dev %p\n"),
2330 (void *)dev));
2331
2332 #ifdef YAFFS_COMPILE_FREEZER
2333 set_freezable();
2334 #endif
2335 while(context->bgRunning){
2336 T(YAFFS_TRACE_BACKGROUND,
2337 (TSTR("yaffs_background\n")));
2338
2339 if(kthread_should_stop())
2340 break;
2341
2342 #ifdef YAFFS_COMPILE_FREEZER
2343 if(try_to_freeze())
2344 continue;
2345 #endif
2346 yaffs_gross_lock(dev);
2347
2348 now = jiffies;
2349
2350 if(time_after(now, next_dir_update) && yaffs_bg_enable){
2351 yaffs_update_dirty_dirs(dev);
2352 next_dir_update = now + HZ;
2353 }
2354
2355 if(time_after(now,next_gc) && yaffs_bg_enable){
2356 if(!dev->is_checkpointed){
2357 urgency = yaffs_bg_gc_urgency(dev);
2358 gcResult = yaffs_bg_gc(dev, urgency);
2359 if(urgency > 1)
2360 next_gc = now + HZ/20+1;
2361 else if(urgency > 0)
2362 next_gc = now + HZ/10+1;
2363 else
2364 next_gc = now + HZ * 2;
2365 } else /*
2366 * gc not running so set to next_dir_update
2367 * to cut down on wake ups
2368 */
2369 next_gc = next_dir_update;
2370 }
2371 yaffs_gross_unlock(dev);
2372 #if 1
2373 expires = next_dir_update;
2374 if (time_before(next_gc,expires))
2375 expires = next_gc;
2376 if(time_before(expires,now))
2377 expires = now + HZ;
2378
2379 Y_INIT_TIMER(&timer);
2380 timer.expires = expires+1;
2381 timer.data = (unsigned long) current;
2382 timer.function = yaffs_background_waker;
2383
2384 set_current_state(TASK_INTERRUPTIBLE);
2385 add_timer(&timer);
2386 schedule();
2387 del_timer_sync(&timer);
2388 #else
2389 msleep(10);
2390 #endif
2391 }
2392
2393 return 0;
2394 }
2395
2396 static int yaffs_bg_start(yaffs_dev_t *dev)
2397 {
2398 int retval = 0;
2399 struct yaffs_LinuxContext *context = yaffs_dev_to_lc(dev);
2400
2401 if(dev->read_only)
2402 return -1;
2403
2404 context->bgRunning = 1;
2405
2406 context->bgThread = kthread_run(yaffs_bg_thread_fn,
2407 (void *)dev,"yaffs-bg-%d",context->mount_id);
2408
2409 if(IS_ERR(context->bgThread)){
2410 retval = PTR_ERR(context->bgThread);
2411 context->bgThread = NULL;
2412 context->bgRunning = 0;
2413 }
2414 return retval;
2415 }
2416
2417 static void yaffs_bg_stop(yaffs_dev_t *dev)
2418 {
2419 struct yaffs_LinuxContext *ctxt = yaffs_dev_to_lc(dev);
2420
2421 ctxt->bgRunning = 0;
2422
2423 if( ctxt->bgThread){
2424 kthread_stop(ctxt->bgThread);
2425 ctxt->bgThread = NULL;
2426 }
2427 }
2428 #else
2429 static int yaffs_bg_thread_fn(void *data)
2430 {
2431 return 0;
2432 }
2433
2434 static int yaffs_bg_start(yaffs_dev_t *dev)
2435 {
2436 return 0;
2437 }
2438
2439 static void yaffs_bg_stop(yaffs_dev_t *dev)
2440 {
2441 }
2442 #endif
2443
2444
2445 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2446 static void yaffs_write_super(struct super_block *sb)
2447 #else
2448 static int yaffs_write_super(struct super_block *sb)
2449 #endif
2450 {
2451 unsigned request_checkpoint = (yaffs_auto_checkpoint >= 2);
2452
2453 T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
2454 (TSTR("yaffs_write_super%s\n"),
2455 request_checkpoint ? " checkpt" : ""));
2456
2457 yaffs_do_sync_fs(sb, request_checkpoint);
2458
2459 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 18))
2460 return 0;
2461 #endif
2462 }
2463
2464
2465 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2466 static int yaffs_sync_fs(struct super_block *sb, int wait)
2467 #else
2468 static int yaffs_sync_fs(struct super_block *sb)
2469 #endif
2470 {
2471 unsigned request_checkpoint = (yaffs_auto_checkpoint >= 1);
2472
2473 T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
2474 (TSTR("yaffs_sync_fs%s\n"),
2475 request_checkpoint ? " checkpt" : ""));
2476
2477 yaffs_do_sync_fs(sb, request_checkpoint);
2478
2479 return 0;
2480 }
2481
2482 #ifdef YAFFS_USE_OWN_IGET
2483
2484 static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino)
2485 {
2486 struct inode *inode;
2487 yaffs_obj_t *obj;
2488 yaffs_dev_t *dev = yaffs_SuperToDevice(sb);
2489
2490 T(YAFFS_TRACE_OS,
2491 (TSTR("yaffs_iget for %lu\n"), ino));
2492
2493 inode = iget_locked(sb, ino);
2494 if (!inode)
2495 return ERR_PTR(-ENOMEM);
2496 if (!(inode->i_state & I_NEW))
2497 return inode;
2498
2499 /* NB This is called as a side effect of other functions, but
2500 * we had to release the lock to prevent deadlocks, so
2501 * need to lock again.
2502 */
2503
2504 yaffs_gross_lock(dev);
2505
2506 obj = yaffs_find_by_number(dev, inode->i_ino);
2507
2508 yaffs_fill_inode_from_obj(inode, obj);
2509
2510 yaffs_gross_unlock(dev);
2511
2512 unlock_new_inode(inode);
2513 return inode;
2514 }
2515
2516 #else
2517
2518 static void yaffs_read_inode(struct inode *inode)
2519 {
2520 /* NB This is called as a side effect of other functions, but
2521 * we had to release the lock to prevent deadlocks, so
2522 * need to lock again.
2523 */
2524
2525 yaffs_obj_t *obj;
2526 yaffs_dev_t *dev = yaffs_SuperToDevice(inode->i_sb);
2527
2528 T(YAFFS_TRACE_OS,
2529 (TSTR("yaffs_read_inode for %d\n"), (int)inode->i_ino));
2530
2531 if(current != yaffs_dev_to_lc(dev)->readdirProcess)
2532 yaffs_gross_lock(dev);
2533
2534 obj = yaffs_find_by_number(dev, inode->i_ino);
2535
2536 yaffs_fill_inode_from_obj(inode, obj);
2537
2538 if(current != yaffs_dev_to_lc(dev)->readdirProcess)
2539 yaffs_gross_unlock(dev);
2540 }
2541
2542 #endif
2543
2544 static YLIST_HEAD(yaffs_context_list);
2545 struct semaphore yaffs_context_lock;
2546
2547 static void yaffs_put_super(struct super_block *sb)
2548 {
2549 yaffs_dev_t *dev = yaffs_SuperToDevice(sb);
2550
2551 T(YAFFS_TRACE_OS, (TSTR("yaffs_put_super\n")));
2552
2553 T(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
2554 (TSTR("Shutting down yaffs background thread\n")));
2555 yaffs_bg_stop(dev);
2556 T(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
2557 (TSTR("yaffs background thread shut down\n")));
2558
2559 yaffs_gross_lock(dev);
2560
2561 yaffs_flush_super(sb,1);
2562
2563 if (yaffs_dev_to_lc(dev)->putSuperFunc)
2564 yaffs_dev_to_lc(dev)->putSuperFunc(sb);
2565
2566
2567 yaffs_deinitialise(dev);
2568
2569 yaffs_gross_unlock(dev);
2570
2571 down(&yaffs_context_lock);
2572 ylist_del_init(&(yaffs_dev_to_lc(dev)->contextList));
2573 up(&yaffs_context_lock);
2574
2575 if (yaffs_dev_to_lc(dev)->spareBuffer) {
2576 YFREE(yaffs_dev_to_lc(dev)->spareBuffer);
2577 yaffs_dev_to_lc(dev)->spareBuffer = NULL;
2578 }
2579
2580 kfree(dev);
2581 }
2582
2583
2584 static void yaffs_MTDPutSuper(struct super_block *sb)
2585 {
2586 struct mtd_info *mtd = yaffs_dev_to_mtd(yaffs_SuperToDevice(sb));
2587
2588 if (mtd->sync)
2589 mtd->sync(mtd);
2590
2591 put_mtd_device(mtd);
2592 }
2593
2594
2595 static void yaffs_touch_super(yaffs_dev_t *dev)
2596 {
2597 struct super_block *sb = yaffs_dev_to_lc(dev)->superBlock;
2598
2599 T(YAFFS_TRACE_OS, (TSTR("yaffs_touch_super() sb = %p\n"), sb));
2600 if (sb)
2601 sb->s_dirt = 1;
2602 }
2603
2604 typedef struct {
2605 int inband_tags;
2606 int skip_checkpoint_read;
2607 int skip_checkpoint_write;
2608 int no_cache;
2609 int tags_ecc_on;
2610 int tags_ecc_overridden;
2611 int lazy_loading_enabled;
2612 int lazy_loading_overridden;
2613 int empty_lost_and_found;
2614 int empty_lost_and_found_overridden;
2615 } yaffs_options;
2616
2617 #define MAX_OPT_LEN 30
2618 static int yaffs_parse_options(yaffs_options *options, const char *options_str)
2619 {
2620 char cur_opt[MAX_OPT_LEN + 1];
2621 int p;
2622 int error = 0;
2623
2624 /* Parse through the options which is a comma seperated list */
2625
2626 while (options_str && *options_str && !error) {
2627 memset(cur_opt, 0, MAX_OPT_LEN + 1);
2628 p = 0;
2629
2630 while(*options_str == ',')
2631 options_str++;
2632
2633 while (*options_str && *options_str != ',') {
2634 if (p < MAX_OPT_LEN) {
2635 cur_opt[p] = *options_str;
2636 p++;
2637 }
2638 options_str++;
2639 }
2640
2641 if (!strcmp(cur_opt, "inband-tags"))
2642 options->inband_tags = 1;
2643 else if (!strcmp(cur_opt, "tags-ecc-off")){
2644 options->tags_ecc_on = 0;
2645 options->tags_ecc_overridden=1;
2646 } else if (!strcmp(cur_opt, "tags-ecc-on")){
2647 options->tags_ecc_on = 1;
2648 options->tags_ecc_overridden = 1;
2649 } else if (!strcmp(cur_opt, "lazy-loading-off")){
2650 options->lazy_loading_enabled = 0;
2651 options->lazy_loading_overridden=1;
2652 } else if (!strcmp(cur_opt, "lazy-loading-on")){
2653 options->lazy_loading_enabled = 1;
2654 options->lazy_loading_overridden = 1;
2655 } else if (!strcmp(cur_opt, "empty-lost-and-found-off")){
2656 options->empty_lost_and_found = 0;
2657 options->empty_lost_and_found_overridden=1;
2658 } else if (!strcmp(cur_opt, "empty-lost-and-found-on")){
2659 options->empty_lost_and_found = 1;
2660 options->empty_lost_and_found_overridden=1;
2661 } else if (!strcmp(cur_opt, "no-cache"))
2662 options->no_cache = 1;
2663 else if (!strcmp(cur_opt, "no-checkpoint-read"))
2664 options->skip_checkpoint_read = 1;
2665 else if (!strcmp(cur_opt, "no-checkpoint-write"))
2666 options->skip_checkpoint_write = 1;
2667 else if (!strcmp(cur_opt, "no-checkpoint")) {
2668 options->skip_checkpoint_read = 1;
2669 options->skip_checkpoint_write = 1;
2670 } else {
2671 printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n",
2672 cur_opt);
2673 error = 1;
2674 }
2675 }
2676
2677 return error;
2678 }
2679
2680 static struct super_block *yaffs_internal_read_super(int yaffs_version,
2681 struct super_block *sb,
2682 void *data, int silent)
2683 {
2684 int nBlocks;
2685 struct inode *inode = NULL;
2686 struct dentry *root;
2687 yaffs_dev_t *dev = 0;
2688 char devname_buf[BDEVNAME_SIZE + 1];
2689 struct mtd_info *mtd;
2690 int err;
2691 char *data_str = (char *)data;
2692 struct yaffs_LinuxContext *context = NULL;
2693 yaffs_param_t *param;
2694
2695 int read_only = 0;
2696
2697 yaffs_options options;
2698
2699 unsigned mount_id;
2700 int found;
2701 struct yaffs_LinuxContext *context_iterator;
2702 struct ylist_head *l;
2703
2704 sb->s_magic = YAFFS_MAGIC;
2705 sb->s_op = &yaffs_super_ops;
2706 sb->s_flags |= MS_NOATIME;
2707
2708 read_only =((sb->s_flags & MS_RDONLY) != 0);
2709
2710
2711 #ifdef YAFFS_COMPILE_EXPORTFS
2712 sb->s_export_op = &yaffs_export_ops;
2713 #endif
2714
2715 if (!sb)
2716 printk(KERN_INFO "yaffs: sb is NULL\n");
2717 else if (!sb->s_dev)
2718 printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
2719 else if (!yaffs_devname(sb, devname_buf))
2720 printk(KERN_INFO "yaffs: devname is NULL\n");
2721 else
2722 printk(KERN_INFO "yaffs: dev is %d name is \"%s\" %s\n",
2723 sb->s_dev,
2724 yaffs_devname(sb, devname_buf),
2725 read_only ? "ro" : "rw");
2726
2727 if (!data_str)
2728 data_str = "";
2729
2730 printk(KERN_INFO "yaffs: passed flags \"%s\"\n", data_str);
2731
2732 memset(&options, 0, sizeof(options));
2733
2734 if (yaffs_parse_options(&options, data_str)) {
2735 /* Option parsing failed */
2736 return NULL;
2737 }
2738
2739
2740 sb->s_blocksize = PAGE_CACHE_SIZE;
2741 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
2742
2743 T(YAFFS_TRACE_OS,
2744 (TSTR("yaffs_read_super: Using yaffs%d\n"), yaffs_version));
2745 T(YAFFS_TRACE_OS,
2746 (TSTR("yaffs_read_super: block size %d\n"),
2747 (int)(sb->s_blocksize)));
2748
2749 T(YAFFS_TRACE_ALWAYS,
2750 (TSTR("yaffs: Attempting MTD mount of %u.%u,\"%s\"\n"),
2751 MAJOR(sb->s_dev), MINOR(sb->s_dev),
2752 yaffs_devname(sb, devname_buf)));
2753
2754 /* Check it's an mtd device..... */
2755 if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
2756 return NULL; /* This isn't an mtd device */
2757
2758 /* Get the device */
2759 mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
2760 if (!mtd) {
2761 T(YAFFS_TRACE_ALWAYS,
2762 (TSTR("yaffs: MTD device #%u doesn't appear to exist\n"),
2763 MINOR(sb->s_dev)));
2764 return NULL;
2765 }
2766 /* Check it's NAND */
2767 if (mtd->type != MTD_NANDFLASH) {
2768 T(YAFFS_TRACE_ALWAYS,
2769 (TSTR("yaffs: MTD device is not NAND it's type %d\n"),
2770 mtd->type));
2771 return NULL;
2772 }
2773
2774 T(YAFFS_TRACE_OS, (TSTR(" erase %p\n"), mtd->erase));
2775 T(YAFFS_TRACE_OS, (TSTR(" read %p\n"), mtd->read));
2776 T(YAFFS_TRACE_OS, (TSTR(" write %p\n"), mtd->write));
2777 T(YAFFS_TRACE_OS, (TSTR(" readoob %p\n"), mtd->read_oob));
2778 T(YAFFS_TRACE_OS, (TSTR(" writeoob %p\n"), mtd->write_oob));
2779 T(YAFFS_TRACE_OS, (TSTR(" block_isbad %p\n"), mtd->block_isbad));
2780 T(YAFFS_TRACE_OS, (TSTR(" block_markbad %p\n"), mtd->block_markbad));
2781 T(YAFFS_TRACE_OS, (TSTR(" %s %d\n"), WRITE_SIZE_STR, WRITE_SIZE(mtd)));
2782 T(YAFFS_TRACE_OS, (TSTR(" oobsize %d\n"), mtd->oobsize));
2783 T(YAFFS_TRACE_OS, (TSTR(" erasesize %d\n"), mtd->erasesize));
2784 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
2785 T(YAFFS_TRACE_OS, (TSTR(" size %u\n"), mtd->size));
2786 #else
2787 T(YAFFS_TRACE_OS, (TSTR(" size %lld\n"), mtd->size));
2788 #endif
2789
2790 #ifdef CONFIG_YAFFS_AUTO_YAFFS2
2791
2792 if (yaffs_version == 1 && WRITE_SIZE(mtd) >= 2048) {
2793 T(YAFFS_TRACE_ALWAYS,
2794 (TSTR("yaffs: auto selecting yaffs2\n")));
2795 yaffs_version = 2;
2796 }
2797
2798 /* Added NCB 26/5/2006 for completeness */
2799 if (yaffs_version == 2 && !options.inband_tags && WRITE_SIZE(mtd) == 512) {
2800 T(YAFFS_TRACE_ALWAYS,
2801 (TSTR("yaffs: auto selecting yaffs1\n")));
2802 yaffs_version = 1;
2803 }
2804
2805 #endif
2806
2807 if (yaffs_version == 2) {
2808 /* Check for version 2 style functions */
2809 if (!mtd->erase ||
2810 !mtd->block_isbad ||
2811 !mtd->block_markbad ||
2812 !mtd->read ||
2813 !mtd->write ||
2814 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2815 !mtd->read_oob || !mtd->write_oob) {
2816 #else
2817 !mtd->write_ecc ||
2818 !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
2819 #endif
2820 T(YAFFS_TRACE_ALWAYS,
2821 (TSTR("yaffs: MTD device does not support required "
2822 "functions\n")));
2823 return NULL;
2824 }
2825
2826 if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
2827 mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) &&
2828 !options.inband_tags) {
2829 T(YAFFS_TRACE_ALWAYS,
2830 (TSTR("yaffs: MTD device does not have the "
2831 "right page sizes\n")));
2832 return NULL;
2833 }
2834 } else {
2835 /* Check for V1 style functions */
2836 if (!mtd->erase ||
2837 !mtd->read ||
2838 !mtd->write ||
2839 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2840 !mtd->read_oob || !mtd->write_oob) {
2841 #else
2842 !mtd->write_ecc ||
2843 !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
2844 #endif
2845 T(YAFFS_TRACE_ALWAYS,
2846 (TSTR("yaffs: MTD device does not support required "
2847 "functions\n")));
2848 return NULL;
2849 }
2850
2851 if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK ||
2852 mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
2853 T(YAFFS_TRACE_ALWAYS,
2854 (TSTR("yaffs: MTD device does not support have the "
2855 "right page sizes\n")));
2856 return NULL;
2857 }
2858 }
2859
2860 /* OK, so if we got here, we have an MTD that's NAND and looks
2861 * like it has the right capabilities
2862 * Set the yaffs_dev_t up for mtd
2863 */
2864
2865 if (!read_only && !(mtd->flags & MTD_WRITEABLE)){
2866 read_only = 1;
2867 printk(KERN_INFO "yaffs: mtd is read only, setting superblock read only");
2868 sb->s_flags |= MS_RDONLY;
2869 }
2870
2871 dev = kmalloc(sizeof(yaffs_dev_t), GFP_KERNEL);
2872 context = kmalloc(sizeof(struct yaffs_LinuxContext),GFP_KERNEL);
2873
2874 if(!dev || !context ){
2875 if(dev)
2876 kfree(dev);
2877 if(context)
2878 kfree(context);
2879 dev = NULL;
2880 context = NULL;
2881 }
2882
2883 if (!dev) {
2884 /* Deep shit could not allocate device structure */
2885 T(YAFFS_TRACE_ALWAYS,
2886 (TSTR("yaffs_read_super: Failed trying to allocate "
2887 "yaffs_dev_t. \n")));
2888 return NULL;
2889 }
2890 memset(dev, 0, sizeof(yaffs_dev_t));
2891 param = &(dev->param);
2892
2893 memset(context,0,sizeof(struct yaffs_LinuxContext));
2894 dev->os_context = context;
2895 YINIT_LIST_HEAD(&(context->contextList));
2896 context->dev = dev;
2897 context->superBlock = sb;
2898
2899 dev->read_only = read_only;
2900
2901 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2902 sb->s_fs_info = dev;
2903 #else
2904 sb->u.generic_sbp = dev;
2905 #endif
2906
2907 dev->driver_context = mtd;
2908 param->name = mtd->name;
2909
2910 /* Set up the memory size parameters.... */
2911
2912 nBlocks = YCALCBLOCKS(mtd->size, (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK));
2913
2914 param->start_block = 0;
2915 param->end_block = nBlocks - 1;
2916 param->chunks_per_block = YAFFS_CHUNKS_PER_BLOCK;
2917 param->total_bytes_per_chunk = YAFFS_BYTES_PER_CHUNK;
2918 param->n_reserved_blocks = 5;
2919 param->n_caches = (options.no_cache) ? 0 : 10;
2920 param->inband_tags = options.inband_tags;
2921
2922 #ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
2923 param->disable_lazy_load = 1;
2924 #endif
2925 #ifdef CONFIG_YAFFS_XATTR
2926 param->enable_xattr = 1;
2927 #endif
2928 if(options.lazy_loading_overridden)
2929 param->disable_lazy_load = !options.lazy_loading_enabled;
2930
2931 #ifdef CONFIG_YAFFS_DISABLE_TAGS_ECC
2932 param->no_tags_ecc = 1;
2933 #endif
2934
2935 #ifdef CONFIG_YAFFS_DISABLE_BACKGROUND
2936 #else
2937 param->defered_dir_update = 1;
2938 #endif
2939
2940 if(options.tags_ecc_overridden)
2941 param->no_tags_ecc = !options.tags_ecc_on;
2942
2943 #ifdef CONFIG_YAFFS_EMPTY_LOST_AND_FOUND
2944 param->empty_lost_n_found = 1;
2945 #endif
2946
2947 #ifdef CONFIG_YAFFS_DISABLE_BLOCK_REFRESHING
2948 param->refresh_period = 0;
2949 #else
2950 param->refresh_period = 500;
2951 #endif
2952
2953 #ifdef CONFIG_YAFFS__ALWAYS_CHECK_CHUNK_ERASED
2954 param->always_check_erased = 1;
2955 #endif
2956
2957 if(options.empty_lost_and_found_overridden)
2958 param->empty_lost_n_found = options.empty_lost_and_found;
2959
2960 /* ... and the functions. */
2961 if (yaffs_version == 2) {
2962 param->write_chunk_tags_fn =
2963 nandmtd2_WriteChunkWithTagsToNAND;
2964 param->read_chunk_tags_fn =
2965 nandmtd2_ReadChunkWithTagsFromNAND;
2966 param->bad_block_fn = nandmtd2_MarkNANDBlockBad;
2967 param->query_block_fn = nandmtd2_QueryNANDBlock;
2968 yaffs_dev_to_lc(dev)->spareBuffer = YMALLOC(mtd->oobsize);
2969 param->is_yaffs2 = 1;
2970 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2971 param->total_bytes_per_chunk = mtd->writesize;
2972 param->chunks_per_block = mtd->erasesize / mtd->writesize;
2973 #else
2974 param->total_bytes_per_chunk = mtd->oobblock;
2975 param->chunks_per_block = mtd->erasesize / mtd->oobblock;
2976 #endif
2977 nBlocks = YCALCBLOCKS(mtd->size, mtd->erasesize);
2978
2979 param->start_block = 0;
2980 param->end_block = nBlocks - 1;
2981 } else {
2982 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2983 /* use the MTD interface in yaffs_mtdif1.c */
2984 param->write_chunk_tags_fn =
2985 nandmtd1_WriteChunkWithTagsToNAND;
2986 param->read_chunk_tags_fn =
2987 nandmtd1_ReadChunkWithTagsFromNAND;
2988 param->bad_block_fn = nandmtd1_MarkNANDBlockBad;
2989 param->query_block_fn = nandmtd1_QueryNANDBlock;
2990 #else
2991 param->write_chunk_fn = nandmtd_WriteChunkToNAND;
2992 param->read_chunk_fn = nandmtd_ReadChunkFromNAND;
2993 #endif
2994 param->is_yaffs2 = 0;
2995 }
2996 /* ... and common functions */
2997 param->erase_fn = nandmtd_EraseBlockInNAND;
2998 param->initialise_flash_fn = nandmtd_InitialiseNAND;
2999
3000 yaffs_dev_to_lc(dev)->putSuperFunc = yaffs_MTDPutSuper;
3001
3002 param->sb_dirty_fn = yaffs_touch_super;
3003 param->gc_control = yaffs_gc_control_callback;
3004
3005 yaffs_dev_to_lc(dev)->superBlock= sb;
3006
3007
3008 #ifndef CONFIG_YAFFS_DOES_ECC
3009 param->use_nand_ecc = 1;
3010 #endif
3011
3012 #ifdef CONFIG_YAFFS_DISABLE_WIDE_TNODES
3013 param->wide_tnodes_disabled = 1;
3014 #endif
3015
3016 param->skip_checkpt_rd = options.skip_checkpoint_read;
3017 param->skip_checkpt_wr = options.skip_checkpoint_write;
3018
3019 down(&yaffs_context_lock);
3020 /* Get a mount id */
3021 found = 0;
3022 for(mount_id=0; ! found; mount_id++){
3023 found = 1;
3024 ylist_for_each(l,&yaffs_context_list){
3025 context_iterator = ylist_entry(l,struct yaffs_LinuxContext,contextList);
3026 if(context_iterator->mount_id == mount_id)
3027 found = 0;
3028 }
3029 }
3030 context->mount_id = mount_id;
3031
3032 ylist_add_tail(&(yaffs_dev_to_lc(dev)->contextList), &yaffs_context_list);
3033 up(&yaffs_context_lock);
3034
3035 /* Directory search handling...*/
3036 YINIT_LIST_HEAD(&(yaffs_dev_to_lc(dev)->searchContexts));
3037 param->remove_obj_fn = yaffs_remove_obj_callback;
3038
3039 init_MUTEX(&(yaffs_dev_to_lc(dev)->grossLock));
3040
3041 yaffs_gross_lock(dev);
3042
3043 err = yaffs_guts_initialise(dev);
3044
3045 T(YAFFS_TRACE_OS,
3046 (TSTR("yaffs_read_super: guts initialised %s\n"),
3047 (err == YAFFS_OK) ? "OK" : "FAILED"));
3048
3049 if(err == YAFFS_OK)
3050 yaffs_bg_start(dev);
3051
3052 if(!context->bgThread)
3053 param->defered_dir_update = 0;
3054
3055
3056 /* Release lock before yaffs_get_inode() */
3057 yaffs_gross_unlock(dev);
3058
3059 /* Create root inode */
3060 if (err == YAFFS_OK)
3061 inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,
3062 yaffs_root(dev));
3063
3064 if (!inode)
3065 return NULL;
3066
3067 inode->i_op = &yaffs_dir_inode_operations;
3068 inode->i_fop = &yaffs_dir_operations;
3069
3070 T(YAFFS_TRACE_OS, (TSTR("yaffs_read_super: got root inode\n")));
3071
3072 root = d_alloc_root(inode);
3073
3074 T(YAFFS_TRACE_OS, (TSTR("yaffs_read_super: d_alloc_root done\n")));
3075
3076 if (!root) {
3077 iput(inode);
3078 return NULL;
3079 }
3080 sb->s_root = root;
3081 sb->s_dirt = !dev->is_checkpointed;
3082 T(YAFFS_TRACE_ALWAYS,
3083 (TSTR("yaffs_read_super: is_checkpointed %d\n"),
3084 dev->is_checkpointed));
3085
3086 T(YAFFS_TRACE_OS, (TSTR("yaffs_read_super: done\n")));
3087 return sb;
3088 }
3089
3090
3091 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
3092 static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
3093 int silent)
3094 {
3095 return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
3096 }
3097
3098 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
3099 static int yaffs_read_super(struct file_system_type *fs,
3100 int flags, const char *dev_name,
3101 void *data, struct vfsmount *mnt)
3102 {
3103
3104 return get_sb_bdev(fs, flags, dev_name, data,
3105 yaffs_internal_read_super_mtd, mnt);
3106 }
3107 #else
3108 static struct super_block *yaffs_read_super(struct file_system_type *fs,
3109 int flags, const char *dev_name,
3110 void *data)
3111 {
3112
3113 return get_sb_bdev(fs, flags, dev_name, data,
3114 yaffs_internal_read_super_mtd);
3115 }
3116 #endif
3117
3118 static struct file_system_type yaffs_fs_type = {
3119 .owner = THIS_MODULE,
3120 .name = "yaffs",
3121 .get_sb = yaffs_read_super,
3122 .kill_sb = kill_block_super,
3123 .fs_flags = FS_REQUIRES_DEV,
3124 };
3125 #else
3126 static struct super_block *yaffs_read_super(struct super_block *sb, void *data,
3127 int silent)
3128 {
3129 return yaffs_internal_read_super(1, sb, data, silent);
3130 }
3131
3132 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super,
3133 FS_REQUIRES_DEV);
3134 #endif
3135
3136
3137 #ifdef CONFIG_YAFFS_YAFFS2
3138
3139 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
3140 static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
3141 int silent)
3142 {
3143 return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
3144 }
3145
3146 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
3147 static int yaffs2_read_super(struct file_system_type *fs,
3148 int flags, const char *dev_name, void *data,
3149 struct vfsmount *mnt)
3150 {
3151 return get_sb_bdev(fs, flags, dev_name, data,
3152 yaffs2_internal_read_super_mtd, mnt);
3153 }
3154 #else
3155 static struct super_block *yaffs2_read_super(struct file_system_type *fs,
3156 int flags, const char *dev_name,
3157 void *data)
3158 {
3159
3160 return get_sb_bdev(fs, flags, dev_name, data,
3161 yaffs2_internal_read_super_mtd);
3162 }
3163 #endif
3164
3165 static struct file_system_type yaffs2_fs_type = {
3166 .owner = THIS_MODULE,
3167 .name = "yaffs2",
3168 .get_sb = yaffs2_read_super,
3169 .kill_sb = kill_block_super,
3170 .fs_flags = FS_REQUIRES_DEV,
3171 };
3172 #else
3173 static struct super_block *yaffs2_read_super(struct super_block *sb,
3174 void *data, int silent)
3175 {
3176 return yaffs_internal_read_super(2, sb, data, silent);
3177 }
3178
3179 static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super,
3180 FS_REQUIRES_DEV);
3181 #endif
3182
3183 #endif /* CONFIG_YAFFS_YAFFS2 */
3184
3185 static struct proc_dir_entry *my_proc_entry;
3186 static struct proc_dir_entry *debug_proc_entry;
3187
3188 static char *yaffs_dump_dev_part0(char *buf, yaffs_dev_t * dev)
3189 {
3190 buf += sprintf(buf, "start_block.......... %d\n", dev->param.start_block);
3191 buf += sprintf(buf, "end_block............ %d\n", dev->param.end_block);
3192 buf += sprintf(buf, "total_bytes_per_chunk %d\n", dev->param.total_bytes_per_chunk);
3193 buf += sprintf(buf, "use_nand_ecc......... %d\n", dev->param.use_nand_ecc);
3194 buf += sprintf(buf, "no_tags_ecc.......... %d\n", dev->param.no_tags_ecc);
3195 buf += sprintf(buf, "is_yaffs2............ %d\n", dev->param.is_yaffs2);
3196 buf += sprintf(buf, "inband_tags.......... %d\n", dev->param.inband_tags);
3197 buf += sprintf(buf, "empty_lost_n_found... %d\n", dev->param.empty_lost_n_found);
3198 buf += sprintf(buf, "disable_lazy_load.... %d\n", dev->param.disable_lazy_load);
3199 buf += sprintf(buf, "refresh_period....... %d\n", dev->param.refresh_period);
3200 buf += sprintf(buf, "n_caches............. %d\n", dev->param.n_caches);
3201 buf += sprintf(buf, "n_reserved_blocks.... %d\n", dev->param.n_reserved_blocks);
3202 buf += sprintf(buf, "always_check_erased.. %d\n", dev->param.always_check_erased);
3203
3204 buf += sprintf(buf, "\n");
3205
3206 return buf;
3207 }
3208
3209
3210 static char *yaffs_dump_dev_part1(char *buf, yaffs_dev_t * dev)
3211 {
3212 buf += sprintf(buf, "data_bytes_per_chunk. %d\n", dev->data_bytes_per_chunk);
3213 buf += sprintf(buf, "chunk_grp_bits....... %d\n", dev->chunk_grp_bits);
3214 buf += sprintf(buf, "chunk_grp_size....... %d\n", dev->chunk_grp_size);
3215 buf += sprintf(buf, "n_erased_blocks...... %d\n", dev->n_erased_blocks);
3216 buf += sprintf(buf, "blocks_in_checkpt.... %d\n", dev->blocks_in_checkpt);
3217 buf += sprintf(buf, "\n");
3218 buf += sprintf(buf, "n_tnodes............. %d\n", dev->n_tnodes);
3219 buf += sprintf(buf, "n_obj................ %d\n", dev->n_obj);
3220 buf += sprintf(buf, "n_free_chunks........ %d\n", dev->n_free_chunks);
3221 buf += sprintf(buf, "\n");
3222 buf += sprintf(buf, "n_page_writes........ %u\n", dev->n_page_writes);
3223 buf += sprintf(buf, "n_page_reads......... %u\n", dev->n_page_reads);
3224 buf += sprintf(buf, "n_erasures........... %u\n", dev->n_erasures);
3225 buf += sprintf(buf, "n_gc_copies.......... %u\n", dev->n_gc_copies);
3226 buf += sprintf(buf, "all_gcs.............. %u\n", dev->all_gcs);
3227 buf += sprintf(buf, "passive_gc_count..... %u\n", dev->passive_gc_count);
3228 buf += sprintf(buf, "oldest_dirty_gc_count %u\n", dev->oldest_dirty_gc_count);
3229 buf += sprintf(buf, "n_gc_blocks.......... %u\n", dev->n_gc_blocks);
3230 buf += sprintf(buf, "bg_gcs............... %u\n", dev->bg_gcs);
3231 buf += sprintf(buf, "n_retired_writes..... %u\n", dev->n_retired_writes);
3232 buf += sprintf(buf, "nRetireBlocks........ %u\n", dev->n_retired_blocks);
3233 buf += sprintf(buf, "n_ecc_fixed.......... %u\n", dev->n_ecc_fixed);
3234 buf += sprintf(buf, "n_ecc_unfixed........ %u\n", dev->n_ecc_unfixed);
3235 buf += sprintf(buf, "n_tags_ecc_fixed..... %u\n", dev->n_tags_ecc_fixed);
3236 buf += sprintf(buf, "n_tags_ecc_unfixed... %u\n", dev->n_tags_ecc_unfixed);
3237 buf += sprintf(buf, "cache_hits........... %u\n", dev->cache_hits);
3238 buf += sprintf(buf, "n_deleted_files...... %u\n", dev->n_deleted_files);
3239 buf += sprintf(buf, "n_unlinked_files..... %u\n", dev->n_unlinked_files);
3240 buf += sprintf(buf, "refresh_count........ %u\n", dev->refresh_count);
3241 buf += sprintf(buf, "n_bg_deletions....... %u\n", dev->n_bg_deletions);
3242
3243 return buf;
3244 }
3245
3246 static int yaffs_proc_read(char *page,
3247 char **start,
3248 off_t offset, int count, int *eof, void *data)
3249 {
3250 struct ylist_head *item;
3251 char *buf = page;
3252 int step = offset;
3253 int n = 0;
3254
3255 /* Get proc_file_read() to step 'offset' by one on each sucessive call.
3256 * We use 'offset' (*ppos) to indicate where we are in dev_list.
3257 * This also assumes the user has posted a read buffer large
3258 * enough to hold the complete output; but that's life in /proc.
3259 */
3260
3261 *(int *)start = 1;
3262
3263 /* Print header first */
3264 if (step == 0)
3265 buf += sprintf(buf, "Multi-version YAFFS built:" __DATE__ " " __TIME__"\n");
3266 else if (step == 1)
3267 buf += sprintf(buf,"\n");
3268 else {
3269 step-=2;
3270
3271 down(&yaffs_context_lock);
3272
3273 /* Locate and print the Nth entry. Order N-squared but N is small. */
3274 ylist_for_each(item, &yaffs_context_list) {
3275 struct yaffs_LinuxContext *dc = ylist_entry(item, struct yaffs_LinuxContext, contextList);
3276 yaffs_dev_t *dev = dc->dev;
3277
3278 if (n < (step & ~1)) {
3279 n+=2;
3280 continue;
3281 }
3282 if((step & 1)==0){
3283 buf += sprintf(buf, "\nDevice %d \"%s\"\n", n, dev->param.name);
3284 buf = yaffs_dump_dev_part0(buf, dev);
3285 } else
3286 buf = yaffs_dump_dev_part1(buf, dev);
3287
3288 break;
3289 }
3290 up(&yaffs_context_lock);
3291 }
3292
3293 return buf - page < count ? buf - page : count;
3294 }
3295
3296 static int yaffs_stats_proc_read(char *page,
3297 char **start,
3298 off_t offset, int count, int *eof, void *data)
3299 {
3300 struct ylist_head *item;
3301 char *buf = page;
3302 int n = 0;
3303
3304 down(&yaffs_context_lock);
3305
3306 /* Locate and print the Nth entry. Order N-squared but N is small. */
3307 ylist_for_each(item, &yaffs_context_list) {
3308 struct yaffs_LinuxContext *dc = ylist_entry(item, struct yaffs_LinuxContext, contextList);
3309 yaffs_dev_t *dev = dc->dev;
3310
3311 int erasedChunks;
3312
3313 erasedChunks = dev->n_erased_blocks * dev->param.chunks_per_block;
3314
3315 buf += sprintf(buf,"%d, %d, %d, %u, %u, %u, %u\n",
3316 n, dev->n_free_chunks, erasedChunks,
3317 dev->bg_gcs, dev->oldest_dirty_gc_count,
3318 dev->n_obj, dev->n_tnodes);
3319 }
3320 up(&yaffs_context_lock);
3321
3322
3323 return buf - page < count ? buf - page : count;
3324 }
3325
3326 /**
3327 * Set the verbosity of the warnings and error messages.
3328 *
3329 * Note that the names can only be a..z or _ with the current code.
3330 */
3331
3332 static struct {
3333 char *mask_name;
3334 unsigned mask_bitfield;
3335 } mask_flags[] = {
3336 {"allocate", YAFFS_TRACE_ALLOCATE},
3337 {"always", YAFFS_TRACE_ALWAYS},
3338 {"background", YAFFS_TRACE_BACKGROUND},
3339 {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
3340 {"buffers", YAFFS_TRACE_BUFFERS},
3341 {"bug", YAFFS_TRACE_BUG},
3342 {"checkpt", YAFFS_TRACE_CHECKPOINT},
3343 {"deletion", YAFFS_TRACE_DELETION},
3344 {"erase", YAFFS_TRACE_ERASE},
3345 {"error", YAFFS_TRACE_ERROR},
3346 {"gc_detail", YAFFS_TRACE_GC_DETAIL},
3347 {"gc", YAFFS_TRACE_GC},
3348 {"lock", YAFFS_TRACE_LOCK},
3349 {"mtd", YAFFS_TRACE_MTD},
3350 {"nandaccess", YAFFS_TRACE_NANDACCESS},
3351 {"os", YAFFS_TRACE_OS},
3352 {"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
3353 {"scan", YAFFS_TRACE_SCAN},
3354 {"tracing", YAFFS_TRACE_TRACING},
3355 {"sync", YAFFS_TRACE_SYNC},
3356 {"write", YAFFS_TRACE_WRITE},
3357
3358 {"verify", YAFFS_TRACE_VERIFY},
3359 {"verify_nand", YAFFS_TRACE_VERIFY_NAND},
3360 {"verify_full", YAFFS_TRACE_VERIFY_FULL},
3361 {"verify_all", YAFFS_TRACE_VERIFY_ALL},
3362
3363 {"all", 0xffffffff},
3364 {"none", 0},
3365 {NULL, 0},
3366 };
3367
3368 #define MAX_MASK_NAME_LENGTH 40
3369 static int yaffs_proc_write_trace_options(struct file *file, const char *buf,
3370 unsigned long count, void *data)
3371 {
3372 unsigned rg = 0, mask_bitfield;
3373 char *end;
3374 char *mask_name;
3375 const char *x;
3376 char substring[MAX_MASK_NAME_LENGTH + 1];
3377 int i;
3378 int done = 0;
3379 int add, len = 0;
3380 int pos = 0;
3381
3382 rg = yaffs_trace_mask;
3383
3384 while (!done && (pos < count)) {
3385 done = 1;
3386 while ((pos < count) && isspace(buf[pos]))
3387 pos++;
3388
3389 switch (buf[pos]) {
3390 case '+':
3391 case '-':
3392 case '=':
3393 add = buf[pos];
3394 pos++;
3395 break;
3396
3397 default:
3398 add = ' ';
3399 break;
3400 }
3401 mask_name = NULL;
3402
3403 mask_bitfield = simple_strtoul(buf + pos, &end, 0);
3404
3405 if (end > buf + pos) {
3406 mask_name = "numeral";
3407 len = end - (buf + pos);
3408 pos += len;
3409 done = 0;
3410 } else {
3411 for (x = buf + pos, i = 0;
3412 (*x == '_' || (*x >= 'a' && *x <= 'z')) &&
3413 i < MAX_MASK_NAME_LENGTH; x++, i++, pos++)
3414 substring[i] = *x;
3415 substring[i] = '\0';
3416
3417 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
3418 if (strcmp(substring, mask_flags[i].mask_name) == 0) {
3419 mask_name = mask_flags[i].mask_name;
3420 mask_bitfield = mask_flags[i].mask_bitfield;
3421 done = 0;
3422 break;
3423 }
3424 }
3425 }
3426
3427 if (mask_name != NULL) {
3428 done = 0;
3429 switch (add) {
3430 case '-':
3431 rg &= ~mask_bitfield;
3432 break;
3433 case '+':
3434 rg |= mask_bitfield;
3435 break;
3436 case '=':
3437 rg = mask_bitfield;
3438 break;
3439 default:
3440 rg |= mask_bitfield;
3441 break;
3442 }
3443 }
3444 }
3445
3446 yaffs_trace_mask = rg | YAFFS_TRACE_ALWAYS;
3447
3448 printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_trace_mask);
3449
3450 if (rg & YAFFS_TRACE_ALWAYS) {
3451 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
3452 char flag;
3453 flag = ((rg & mask_flags[i].mask_bitfield) ==
3454 mask_flags[i].mask_bitfield) ? '+' : '-';
3455 printk(KERN_DEBUG "%c%s\n", flag, mask_flags[i].mask_name);
3456 }
3457 }
3458
3459 return count;
3460 }
3461
3462
3463 static int yaffs_proc_write(struct file *file, const char *buf,
3464 unsigned long count, void *data)
3465 {
3466 return yaffs_proc_write_trace_options(file, buf, count, data);
3467 }
3468
3469 /* Stuff to handle installation of file systems */
3470 struct file_system_to_install {
3471 struct file_system_type *fst;
3472 int installed;
3473 };
3474
3475 static struct file_system_to_install fs_to_install[] = {
3476 {&yaffs_fs_type, 0},
3477 {&yaffs2_fs_type, 0},
3478 {NULL, 0}
3479 };
3480
3481 static int __init init_yaffs_fs(void)
3482 {
3483 int error = 0;
3484 struct file_system_to_install *fsinst;
3485
3486 T(YAFFS_TRACE_ALWAYS,
3487 (TSTR("yaffs built " __DATE__ " " __TIME__ " Installing. \n")));
3488
3489 #ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
3490 T(YAFFS_TRACE_ALWAYS,
3491 (TSTR(" \n\n\n\nYAFFS-WARNING CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED selected.\n\n\n\n")));
3492 #endif
3493
3494
3495
3496
3497 init_MUTEX(&yaffs_context_lock);
3498
3499 /* Install the proc_fs entries */
3500 my_proc_entry = create_proc_entry("yaffs",
3501 S_IRUGO | S_IFREG,
3502 YPROC_ROOT);
3503
3504 if (my_proc_entry) {
3505 my_proc_entry->write_proc = yaffs_proc_write;
3506 my_proc_entry->read_proc = yaffs_proc_read;
3507 my_proc_entry->data = NULL;
3508 } else
3509 return -ENOMEM;
3510
3511 debug_proc_entry = create_proc_entry("yaffs_stats",
3512 S_IRUGO | S_IFREG,
3513 YPROC_ROOT);
3514
3515 if (debug_proc_entry) {
3516 debug_proc_entry->write_proc = NULL;
3517 debug_proc_entry->read_proc = yaffs_stats_proc_read;
3518 debug_proc_entry->data = NULL;
3519 } else
3520 return -ENOMEM;
3521
3522 /* Now add the file system entries */
3523
3524 fsinst = fs_to_install;
3525
3526 while (fsinst->fst && !error) {
3527 error = register_filesystem(fsinst->fst);
3528 if (!error)
3529 fsinst->installed = 1;
3530 fsinst++;
3531 }
3532
3533 /* Any errors? uninstall */
3534 if (error) {
3535 fsinst = fs_to_install;
3536
3537 while (fsinst->fst) {
3538 if (fsinst->installed) {
3539 unregister_filesystem(fsinst->fst);
3540 fsinst->installed = 0;
3541 }
3542 fsinst++;
3543 }
3544 }
3545
3546 return error;
3547 }
3548
3549 static void __exit exit_yaffs_fs(void)
3550 {
3551
3552 struct file_system_to_install *fsinst;
3553
3554 T(YAFFS_TRACE_ALWAYS,
3555 (TSTR("yaffs built " __DATE__ " " __TIME__ " removing. \n")));
3556
3557 remove_proc_entry("yaffs", YPROC_ROOT);
3558 remove_proc_entry("yaffs_stats", YPROC_ROOT);
3559
3560 fsinst = fs_to_install;
3561
3562 while (fsinst->fst) {
3563 if (fsinst->installed) {
3564 unregister_filesystem(fsinst->fst);
3565 fsinst->installed = 0;
3566 }
3567 fsinst++;
3568 }
3569 }
3570
3571 module_init(init_yaffs_fs)
3572 module_exit(exit_yaffs_fs)
3573
3574 MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
3575 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2010");
3576 MODULE_LICENSE("GPL");
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