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Root/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");
3577

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