2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
4 * Copyright (C) 2002-2011 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
7 * Created by Charles Manning <charles@aleph1.co.uk>
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
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.
23 * This is the file system front-end to YAFFS that hooks it up to
27 * >> 2.4: sb->u.generic_sbp points to the struct yaffs_dev associated with
29 * >> 2.6: sb->s_fs_info points to the struct yaffs_dev associated with this
31 * >> inode->u.generic_ip points to the associated struct yaffs_obj.
35 * There are two variants of the VFS glue code. This variant should compile
36 * for any version of Linux.
38 #include <linux/version.h>
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
47 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 28))
48 #define YAFFS_COMPILE_EXPORTFS
51 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 35))
52 #define YAFFS_USE_SETATTR_COPY
53 #define YAFFS_USE_TRUNCATE_SETSIZE
55 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 35))
56 #define YAFFS_HAS_EVICT_INODE
59 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13)) && \
60 (LINUX_VERSION_CODE < KERNEL_VERSION(4, 8, 0))
61 #define YAFFS_NEW_FOLLOW_LINK 1
63 #define YAFFS_NEW_FOLLOW_LINK 0
66 #if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 6, 0))
67 #define YAFFS_HAS_WRITE_SUPER
71 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
72 #include <linux/config.h>
75 #include <linux/kernel.h>
76 #include <linux/module.h>
77 #include <linux/slab.h>
78 #include <linux/init.h>
80 #include <linux/proc_fs.h>
81 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 39))
82 #include <linux/smp_lock.h>
84 #include <linux/pagemap.h>
85 #include <linux/mtd/mtd.h>
86 #include <linux/interrupt.h>
87 #include <linux/string.h>
88 #include <linux/ctype.h>
90 #if (YAFFS_NEW_FOLLOW_LINK == 1)
91 #include <linux/namei.h>
94 #ifdef YAFFS_COMPILE_EXPORTFS
95 #include <linux/exportfs.h>
98 #ifdef YAFFS_COMPILE_BACKGROUND
99 #include <linux/kthread.h>
100 #include <linux/delay.h>
102 #ifdef YAFFS_COMPILE_FREEZER
103 #include <linux/freezer.h>
106 #include <asm/div64.h>
108 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
110 #include <linux/statfs.h>
112 #define UnlockPage(p) unlock_page(p)
113 #define Page_Uptodate(page) test_bit(PG_uptodate, &(page)->flags)
115 /* FIXME: use sb->s_id instead ? */
116 #define yaffs_devname(sb, buf) bdevname(sb->s_bdev, buf)
120 #include <linux/locks.h>
121 #define BDEVNAME_SIZE 0
122 #define yaffs_devname(sb, buf) kdevname(sb->s_dev)
124 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0))
125 /* added NCB 26/5/2006 for 2.4.25-vrs2-tcl1 kernel */
131 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26))
132 #define YPROC_ROOT (&proc_root)
134 #define YPROC_ROOT NULL
137 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26))
138 #define Y_INIT_TIMER(a) init_timer(a)
140 #define Y_INIT_TIMER(a) init_timer_on_stack(a)
143 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 27))
144 #define YAFFS_USE_WRITE_BEGIN_END 1
146 #define YAFFS_USE_WRITE_BEGIN_END 0
149 #if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 6, 0))
150 #define YAFFS_SUPER_HAS_DIRTY
154 #if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 2, 0))
155 #define set_nlink(inode, count) do { (inode)->i_nlink = (count); } while(0)
158 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 28))
159 static uint32_t YCALCBLOCKS(uint64_t partition_size, uint32_t block_size)
161 uint64_t result = partition_size;
162 do_div(result, block_size);
163 return (uint32_t) result;
166 #define YCALCBLOCKS(s, b) ((s)/(b))
169 #include <linux/uaccess.h>
170 #include <linux/mtd/mtd.h>
172 #include "yportenv.h"
173 #include "yaffs_trace.h"
174 #include "yaffs_guts.h"
175 #include "yaffs_attribs.h"
177 #include "yaffs_linux.h"
179 #include "yaffs_mtdif.h"
180 #include "yaffs_packedtags2.h"
181 #include "yaffs_getblockinfo.h"
183 unsigned int yaffs_trace_mask =
184 YAFFS_TRACE_BAD_BLOCKS |
188 unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS;
189 unsigned int yaffs_auto_checkpoint = 1;
190 unsigned int yaffs_gc_control = 1;
191 unsigned int yaffs_bg_enable = 1;
192 unsigned int yaffs_auto_select = 1;
193 /* Module Parameters */
194 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
195 module_param(yaffs_trace_mask, uint, 0644);
196 module_param(yaffs_wr_attempts, uint, 0644);
197 module_param(yaffs_auto_checkpoint, uint, 0644);
198 module_param(yaffs_gc_control, uint, 0644);
199 module_param(yaffs_bg_enable, uint, 0644);
201 MODULE_PARM(yaffs_trace_mask, "i");
202 MODULE_PARM(yaffs_wr_attempts, "i");
203 MODULE_PARM(yaffs_auto_checkpoint, "i");
204 MODULE_PARM(yaffs_gc_control, "i");
207 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25))
208 /* use iget and read_inode */
209 #define Y_IGET(sb, inum) iget((sb), (inum))
212 /* Call local equivalent */
213 #define YAFFS_USE_OWN_IGET
214 #define Y_IGET(sb, inum) yaffs_iget((sb), (inum))
218 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
219 #define yaffs_inode_to_obj_lv(iptr) ((iptr)->i_private)
221 #define yaffs_inode_to_obj_lv(iptr) ((iptr)->u.generic_ip)
224 #define yaffs_inode_to_obj(iptr) \
225 ((struct yaffs_obj *)(yaffs_inode_to_obj_lv(iptr)))
226 #define yaffs_dentry_to_obj(dptr) yaffs_inode_to_obj((dptr)->d_inode)
228 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
229 #define yaffs_super_to_dev(sb) ((struct yaffs_dev *)sb->s_fs_info)
231 #define yaffs_super_to_dev(sb) ((struct yaffs_dev *)sb->u.generic_sbp)
234 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0))
235 #define Y_CLEAR_INODE(i) clear_inode(i)
237 #define Y_CLEAR_INODE(i) end_writeback(i)
240 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 12, 0))
241 #define YAFFS_USE_DIR_ITERATE
244 #if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 9, 0))
245 #define YAFFS_USE_XATTR
248 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,12,0))
249 #define YAFFS_NEW_PROCFS
250 #include <linux/seq_file.h>
253 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 4, 0))
254 #define PAGE_CACHE_SIZE PAGE_SIZE
255 #define PAGE_CACHE_SHIFT PAGE_SHIFT
256 #define Y_GET_DENTRY(f) ((f)->f_path.dentry)
257 #define YAFFS_NEW_XATTR 1
258 #define YAFFS_NEW_GET_LINK 1
260 #define Y_GET_DENTRY(f) ((f)->f_dentry)
261 #define YAFFS_NEW_XATTR 0
262 #define YAFFS_NEW_GET_LINK 0
265 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 8, 0))
266 #define page_cache_release put_page
269 #define update_dir_time(dir) do {\
270 (dir)->i_ctime = (dir)->i_mtime = CURRENT_TIME; \
273 #if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 9, 0))
274 static inline int setattr_prepare(struct dentry *dentry, struct iattr *attr)
276 return inode_change_ok(dentry->d_inode, attr);
280 static void yaffs_fill_inode_from_obj(struct inode *inode,
281 struct yaffs_obj *obj);
284 static void yaffs_gross_lock(struct yaffs_dev *dev)
286 yaffs_trace(YAFFS_TRACE_LOCK, "yaffs locking %p", current);
287 mutex_lock(&(yaffs_dev_to_lc(dev)->gross_lock));
288 yaffs_trace(YAFFS_TRACE_LOCK, "yaffs locked %p", current);
291 static void yaffs_gross_unlock(struct yaffs_dev *dev)
293 yaffs_trace(YAFFS_TRACE_LOCK, "yaffs unlocking %p", current);
294 mutex_unlock(&(yaffs_dev_to_lc(dev)->gross_lock));
298 static int yaffs_readpage_nolock(struct file *f, struct page *pg)
300 /* Lifted from jffs2 */
302 struct yaffs_obj *obj;
303 unsigned char *pg_buf;
305 loff_t pos = ((loff_t) pg->index) << PAGE_SHIFT;
306 struct yaffs_dev *dev;
308 yaffs_trace(YAFFS_TRACE_OS,
309 "yaffs_readpage_nolock at %lld, size %08x",
311 (unsigned)PAGE_SIZE);
313 obj = yaffs_dentry_to_obj(Y_GET_DENTRY(f));
317 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
318 BUG_ON(!PageLocked(pg));
325 /* FIXME: Can kmap fail? */
327 yaffs_gross_lock(dev);
329 ret = yaffs_file_rd(obj, pg_buf, pos, PAGE_CACHE_SIZE);
331 yaffs_gross_unlock(dev);
337 ClearPageUptodate(pg);
344 flush_dcache_page(pg);
347 yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage_nolock done");
351 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
353 int ret = yaffs_readpage_nolock(f, pg);
358 static int yaffs_readpage(struct file *f, struct page *pg)
362 yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage");
363 ret = yaffs_readpage_unlock(f, pg);
364 yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage done");
369 static void yaffs_set_super_dirty_val(struct yaffs_dev *dev, int val)
371 struct yaffs_linux_context *lc = yaffs_dev_to_lc(dev);
376 # ifdef YAFFS_SUPER_HAS_DIRTY
378 struct super_block *sb = lc->super;
387 static void yaffs_set_super_dirty(struct yaffs_dev *dev)
389 yaffs_set_super_dirty_val(dev, 1);
392 static void yaffs_clear_super_dirty(struct yaffs_dev *dev)
394 yaffs_set_super_dirty_val(dev, 0);
397 static int yaffs_check_super_dirty(struct yaffs_dev *dev)
399 struct yaffs_linux_context *lc = yaffs_dev_to_lc(dev);
404 # ifdef YAFFS_SUPER_HAS_DIRTY
406 struct super_block *sb = lc->super;
408 if (sb && sb->s_dirt)
416 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
417 static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
419 static int yaffs_writepage(struct page *page)
422 struct yaffs_dev *dev;
423 struct address_space *mapping = page->mapping;
425 unsigned long end_index;
427 struct yaffs_obj *obj;
434 inode = mapping->host;
437 i_size = i_size_read(inode);
439 end_index = i_size >> PAGE_CACHE_SHIFT;
441 if (page->index < end_index)
442 n_bytes = PAGE_CACHE_SIZE;
444 n_bytes = i_size & (PAGE_CACHE_SIZE - 1);
446 if (page->index > end_index || !n_bytes) {
447 yaffs_trace(YAFFS_TRACE_OS,
448 "yaffs_writepage at %lld, inode size = %lld!!",
449 ((loff_t)page->index) << PAGE_CACHE_SHIFT,
451 yaffs_trace(YAFFS_TRACE_OS,
454 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
455 set_page_writeback(page);
457 end_page_writeback(page);
462 if (n_bytes != PAGE_CACHE_SIZE)
463 zero_user_segment(page, n_bytes, PAGE_CACHE_SIZE);
469 obj = yaffs_inode_to_obj(inode);
471 yaffs_gross_lock(dev);
473 yaffs_trace(YAFFS_TRACE_OS,
474 "yaffs_writepage at %lld, size %08x",
475 ((loff_t)page->index) << PAGE_CACHE_SHIFT, n_bytes);
476 yaffs_trace(YAFFS_TRACE_OS,
477 "writepag0: obj = %lld, ino = %lld",
478 obj->variant.file_variant.file_size, inode->i_size);
480 n_written = yaffs_wr_file(obj, buffer,
481 ((loff_t)page->index) << PAGE_CACHE_SHIFT, n_bytes, 0);
483 yaffs_set_super_dirty(dev);
485 yaffs_trace(YAFFS_TRACE_OS,
486 "writepag1: obj = %lld, ino = %lld",
487 obj->variant.file_variant.file_size, inode->i_size);
489 yaffs_gross_unlock(dev);
492 set_page_writeback(page);
494 end_page_writeback(page);
497 return (n_written == n_bytes) ? 0 : -ENOSPC;
500 /* Space holding and freeing is done to ensure we have space available for write_begin/end */
501 /* For now we just assume few parallel writes and check against a small number. */
502 /* Todo: need to do this with a counter to handle parallel reads better */
504 static ssize_t yaffs_hold_space(struct file *f)
506 struct yaffs_obj *obj;
507 struct yaffs_dev *dev;
511 obj = yaffs_dentry_to_obj(Y_GET_DENTRY(f));
515 yaffs_gross_lock(dev);
517 n_free_chunks = yaffs_get_n_free_chunks(dev);
519 yaffs_gross_unlock(dev);
521 return (n_free_chunks > 20) ? 1 : 0;
524 static void yaffs_release_space(struct file *f)
526 struct yaffs_obj *obj;
527 struct yaffs_dev *dev;
529 obj = yaffs_dentry_to_obj(Y_GET_DENTRY(f));
533 yaffs_gross_lock(dev);
535 yaffs_gross_unlock(dev);
538 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
539 static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
540 loff_t pos, unsigned len, unsigned flags,
541 struct page **pagep, void **fsdata)
543 struct page *pg = NULL;
544 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
550 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 28)
551 pg = grab_cache_page_write_begin(mapping, index, flags);
553 pg = __grab_cache_page(mapping, index);
561 yaffs_trace(YAFFS_TRACE_OS,
562 "start yaffs_write_begin index %d(%x) uptodate %d",
563 (int)index, (int)index, Page_Uptodate(pg) ? 1 : 0);
566 space_held = yaffs_hold_space(filp);
573 /* Update page if required */
575 if (!Page_Uptodate(pg))
576 ret = yaffs_readpage_nolock(filp, pg);
581 /* Happy path return */
582 yaffs_trace(YAFFS_TRACE_OS, "end yaffs_write_begin - ok");
587 yaffs_trace(YAFFS_TRACE_OS,
588 "end yaffs_write_begin fail returning %d", ret);
590 yaffs_release_space(filp);
593 page_cache_release(pg);
600 static int yaffs_prepare_write(struct file *f, struct page *pg,
601 unsigned offset, unsigned to)
603 yaffs_trace(YAFFS_TRACE_OS, "yaffs_prepair_write");
605 if (!Page_Uptodate(pg))
606 return yaffs_readpage_nolock(f, pg);
612 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
615 struct yaffs_obj *obj;
619 struct yaffs_dev *dev;
621 obj = yaffs_dentry_to_obj(Y_GET_DENTRY(f));
624 yaffs_trace(YAFFS_TRACE_OS,
625 "yaffs_file_write: hey obj is null!");
631 yaffs_gross_lock(dev);
633 inode = Y_GET_DENTRY(f)->d_inode;
635 if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
636 ipos = inode->i_size;
640 yaffs_trace(YAFFS_TRACE_OS,
641 "yaffs_file_write about to write writing %u(%x) bytes to object %d at %lld",
642 (unsigned)n, (unsigned)n, obj->obj_id, ipos);
644 n_written = yaffs_wr_file(obj, buf, ipos, n, 0);
646 yaffs_set_super_dirty(dev);
648 yaffs_trace(YAFFS_TRACE_OS,
649 "yaffs_file_write: %d(%x) bytes written",
650 (unsigned)n, (unsigned)n);
655 if (ipos > inode->i_size) {
656 inode->i_size = ipos;
657 inode->i_blocks = (ipos + 511) >> 9;
659 yaffs_trace(YAFFS_TRACE_OS,
660 "yaffs_file_write size updated to %lld bytes, %d blocks",
661 ipos, (int)(inode->i_blocks));
665 yaffs_gross_unlock(dev);
666 return (n_written == 0) && (n > 0) ? -ENOSPC : n_written;
670 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
671 static int yaffs_write_end(struct file *filp, struct address_space *mapping,
672 loff_t pos, unsigned len, unsigned copied,
673 struct page *pg, void *fsdadata)
677 uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE - 1);
680 addr = kva + offset_into_page;
682 yaffs_trace(YAFFS_TRACE_OS,
683 "yaffs_write_end addr %p pos %lld n_bytes %d",
686 ret = yaffs_file_write(filp, addr, copied, &pos);
689 yaffs_trace(YAFFS_TRACE_OS,
690 "yaffs_write_end not same size ret %d copied %d",
697 yaffs_release_space(filp);
699 page_cache_release(pg);
704 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
709 loff_t pos = (((loff_t) pg->index) << PAGE_CACHE_SHIFT) + offset;
710 int n_bytes = to - offset;
716 yaffs_trace(YAFFS_TRACE_OS,
717 "yaffs_commit_write addr %p pos %lld n_bytes %d",
720 n_written = yaffs_file_write(f, addr, n_bytes, &pos);
722 if (n_written != n_bytes) {
723 yaffs_trace(YAFFS_TRACE_OS,
724 "yaffs_commit_write not same size n_written %d n_bytes %d",
730 yaffs_trace(YAFFS_TRACE_OS,
731 "yaffs_commit_write returning %d",
732 n_written == n_bytes ? 0 : n_written);
734 return n_written == n_bytes ? 0 : n_written;
738 static struct address_space_operations yaffs_file_address_operations = {
739 .readpage = yaffs_readpage,
740 .writepage = yaffs_writepage,
741 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
742 .write_begin = yaffs_write_begin,
743 .write_end = yaffs_write_end,
745 .prepare_write = yaffs_prepare_write,
746 .commit_write = yaffs_commit_write,
751 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
752 static int yaffs_file_flush(struct file *file, fl_owner_t id)
754 static int yaffs_file_flush(struct file *file)
757 struct yaffs_obj *obj = yaffs_dentry_to_obj(Y_GET_DENTRY(file));
759 struct yaffs_dev *dev = obj->my_dev;
761 yaffs_trace(YAFFS_TRACE_OS,
762 "yaffs_file_flush object %d (%s)",
764 obj->dirty ? "dirty" : "clean");
766 yaffs_gross_lock(dev);
768 yaffs_flush_file(obj, 1, 0, 0);
770 yaffs_gross_unlock(dev);
776 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39))
777 static int yaffs_sync_object(struct file *file, loff_t start, loff_t end, int datasync)
778 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34))
779 static int yaffs_sync_object(struct file *file, int datasync)
781 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
785 struct yaffs_obj *obj;
786 struct yaffs_dev *dev;
787 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34))
788 struct dentry *dentry = file->f_path.dentry;
791 obj = yaffs_dentry_to_obj(dentry);
795 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
796 "yaffs_sync_object");
797 yaffs_gross_lock(dev);
798 yaffs_flush_file(obj, 1, datasync, 0);
799 yaffs_gross_unlock(dev);
804 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 22))
805 static const struct file_operations yaffs_file_operations = {
806 #if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 16, 0)
807 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 4, 0)
808 .read = new_sync_read,
809 .write = new_sync_write,
811 .read_iter = generic_file_read_iter,
812 .write_iter = generic_file_write_iter,
814 .read = do_sync_read,
815 .write = do_sync_write,
816 .aio_read = generic_file_aio_read,
817 .aio_write = generic_file_aio_write,
819 .mmap = generic_file_mmap,
820 .flush = yaffs_file_flush,
821 .fsync = yaffs_sync_object,
822 .splice_read = generic_file_splice_read,
823 #if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 16, 0)
824 .splice_write = iter_file_splice_write,
826 .splice_write = generic_file_splice_write,
828 .llseek = generic_file_llseek,
831 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
833 static const struct file_operations yaffs_file_operations = {
834 .read = do_sync_read,
835 .write = do_sync_write,
836 .aio_read = generic_file_aio_read,
837 .aio_write = generic_file_aio_write,
838 .mmap = generic_file_mmap,
839 .flush = yaffs_file_flush,
840 .fsync = yaffs_sync_object,
841 .sendfile = generic_file_sendfile,
846 static const struct file_operations yaffs_file_operations = {
847 .read = generic_file_read,
848 .write = generic_file_write,
849 .mmap = generic_file_mmap,
850 .flush = yaffs_file_flush,
851 .fsync = yaffs_sync_object,
852 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
853 .sendfile = generic_file_sendfile,
861 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25))
862 static void zero_user_segment(struct page *page, unsigned start, unsigned end)
864 void *kaddr = kmap_atomic(page, KM_USER0);
865 memset(kaddr + start, 0, end - start);
866 kunmap_atomic(kaddr, KM_USER0);
867 flush_dcache_page(page);
872 static int yaffs_vfs_setsize(struct inode *inode, loff_t newsize)
874 #ifdef YAFFS_USE_TRUNCATE_SETSIZE
875 truncate_setsize(inode, newsize);
878 truncate_inode_pages(&inode->i_data, newsize);
885 static int yaffs_vfs_setattr(struct inode *inode, struct iattr *attr)
887 #ifdef YAFFS_USE_SETATTR_COPY
888 setattr_copy(inode, attr);
891 return inode_setattr(inode, attr);
896 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
898 struct inode *inode = dentry->d_inode;
900 struct yaffs_dev *dev;
902 yaffs_trace(YAFFS_TRACE_OS,
903 "yaffs_setattr of object %d",
904 yaffs_inode_to_obj(inode)->obj_id);
906 /* Fail if a requested resize >= 2GB */
907 if (attr->ia_valid & ATTR_SIZE && (attr->ia_size >> 31))
912 error = setattr_prepare(dentry, attr);
916 error = yaffs_vfs_setattr(inode, attr);
917 yaffs_trace(YAFFS_TRACE_OS, "inode_setattr called");
918 if (attr->ia_valid & ATTR_SIZE) {
919 yaffs_vfs_setsize(inode, attr->ia_size);
920 inode->i_blocks = (inode->i_size + 511) >> 9;
923 dev = yaffs_inode_to_obj(inode)->my_dev;
924 if (attr->ia_valid & ATTR_SIZE) {
925 yaffs_trace(YAFFS_TRACE_OS,
927 (int)(attr->ia_size),
928 (int)(attr->ia_size));
930 yaffs_gross_lock(dev);
931 result = yaffs_set_attribs(yaffs_inode_to_obj(inode), attr);
932 if (result == YAFFS_OK) {
937 yaffs_gross_unlock(dev);
941 yaffs_trace(YAFFS_TRACE_OS, "yaffs_setattr done returning %d", error);
946 #ifdef YAFFS_USE_XATTR
947 #if (YAFFS_NEW_XATTR > 0)
948 static int yaffs_setxattr(struct dentry *dentry, struct inode *inode,
949 const char *name, const void *value, size_t size, int flags)
952 static int yaffs_setxattr(struct dentry *dentry, const char *name,
953 const void *value, size_t size, int flags)
955 struct inode *inode = dentry->d_inode;
958 struct yaffs_dev *dev;
959 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
961 yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr of object %d", obj->obj_id);
966 yaffs_gross_lock(dev);
967 result = yaffs_set_xattrib(obj, name, value, size, flags);
968 if (result == YAFFS_OK)
972 yaffs_gross_unlock(dev);
975 yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr done returning %d", error);
980 #if (YAFFS_NEW_XATTR > 0)
981 static ssize_t yaffs_getxattr(struct dentry * dentry, struct inode *inode,
982 const char *name, void *buff, size_t size)
985 static ssize_t yaffs_getxattr(struct dentry * dentry, const char *name,
986 void *buff, size_t size)
988 struct inode *inode = dentry->d_inode;
991 struct yaffs_dev *dev;
992 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
994 yaffs_trace(YAFFS_TRACE_OS,
995 "yaffs_getxattr \"%s\" from object %d",
1000 yaffs_gross_lock(dev);
1001 error = yaffs_get_xattrib(obj, name, buff, size);
1002 yaffs_gross_unlock(dev);
1005 yaffs_trace(YAFFS_TRACE_OS, "yaffs_getxattr done returning %d", error);
1010 static int yaffs_removexattr(struct dentry *dentry, const char *name)
1012 struct inode *inode = dentry->d_inode;
1014 struct yaffs_dev *dev;
1015 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
1017 yaffs_trace(YAFFS_TRACE_OS,
1018 "yaffs_removexattr of object %d", obj->obj_id);
1023 yaffs_gross_lock(dev);
1024 result = yaffs_remove_xattrib(obj, name);
1025 if (result == YAFFS_OK)
1027 else if (result < 0)
1029 yaffs_gross_unlock(dev);
1032 yaffs_trace(YAFFS_TRACE_OS,
1033 "yaffs_removexattr done returning %d", error);
1039 static ssize_t yaffs_listxattr(struct dentry * dentry, char *buff, size_t size)
1041 struct inode *inode = dentry->d_inode;
1043 struct yaffs_dev *dev;
1044 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
1046 yaffs_trace(YAFFS_TRACE_OS,
1047 "yaffs_listxattr of object %d", obj->obj_id);
1051 yaffs_gross_lock(dev);
1052 error = yaffs_list_xattrib(obj, buff, size);
1053 yaffs_gross_unlock(dev);
1056 yaffs_trace(YAFFS_TRACE_OS,
1057 "yaffs_listxattr done returning %d", error);
1063 static const struct inode_operations yaffs_file_inode_operations = {
1064 .setattr = yaffs_setattr,
1065 #ifdef YAFFS_USE_XATTR
1066 .setxattr = yaffs_setxattr,
1067 .getxattr = yaffs_getxattr,
1068 .removexattr = yaffs_removexattr,
1070 .listxattr = yaffs_listxattr,
1074 static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
1077 unsigned char *alias;
1080 struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
1082 yaffs_gross_lock(dev);
1084 alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
1086 yaffs_gross_unlock(dev);
1091 #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 15, 0)
1092 ret = vfs_readlink(dentry, buffer, buflen, alias);
1094 ret = readlink_copy(buffer, buflen, alias);
1100 #if (YAFFS_NEW_GET_LINK == 0)
1101 #if (YAFFS_NEW_FOLLOW_LINK == 1)
1102 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
1106 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
1110 unsigned char *alias;
1112 struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
1114 yaffs_gross_lock(dev);
1116 alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
1117 yaffs_gross_unlock(dev);
1123 #if (YAFFS_NEW_FOLLOW_LINK == 1)
1124 nd_set_link(nd, alias);
1128 ret = ERR_PTR(ret_int);
1131 ret = vfs_follow_link(nd, alias);
1140 static const char *yaffs_get_link(struct dentry *dentry, struct inode *inode, struct delayed_call *done)
1142 unsigned char *alias;
1143 struct yaffs_dev *dev;
1146 return ERR_PTR(-ECHILD);
1148 dev = yaffs_dentry_to_obj(dentry)->my_dev;
1150 yaffs_gross_lock(dev);
1152 alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
1153 yaffs_gross_unlock(dev);
1156 return ERR_PTR(-ENOMEM);
1157 set_delayed_call(done, kfree_link, alias);
1162 #ifdef YAFFS_HAS_PUT_INODE
1164 /* For now put inode is just for debugging
1165 * Put inode is called when the inode **structure** is put.
1167 static void yaffs_put_inode(struct inode *inode)
1169 yaffs_trace(YAFFS_TRACE_OS,
1170 "yaffs_put_inode: ino %d, count %d"),
1171 (int)inode->i_ino, atomic_read(&inode->i_count);
1176 #if (YAFFS_NEW_FOLLOW_LINK == 1)
1177 void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias)
1183 static const struct inode_operations yaffs_symlink_inode_operations = {
1184 .readlink = yaffs_readlink,
1185 #if (YAFFS_NEW_GET_LINK == 1)
1186 .get_link = yaffs_get_link,
1188 .follow_link = yaffs_follow_link,
1190 #if (YAFFS_NEW_FOLLOW_LINK == 1)
1191 .put_link = yaffs_put_link,
1193 .setattr = yaffs_setattr,
1194 #ifdef YAFFS_USE_XATTR
1195 .setxattr = yaffs_setxattr,
1196 .getxattr = yaffs_getxattr,
1197 .removexattr = yaffs_removexattr,
1199 .listxattr = yaffs_listxattr,
1202 #ifdef YAFFS_USE_OWN_IGET
1204 static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino)
1206 struct inode *inode;
1207 struct yaffs_obj *obj;
1208 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
1210 yaffs_trace(YAFFS_TRACE_OS, "yaffs_iget for %lu", ino);
1212 inode = iget_locked(sb, ino);
1214 return ERR_PTR(-ENOMEM);
1215 if (!(inode->i_state & I_NEW))
1218 /* NB This is called as a side effect of other functions, but
1219 * we had to release the lock to prevent deadlocks, so
1220 * need to lock again.
1223 yaffs_gross_lock(dev);
1225 obj = yaffs_find_by_number(dev, inode->i_ino);
1227 yaffs_fill_inode_from_obj(inode, obj);
1229 yaffs_gross_unlock(dev);
1231 unlock_new_inode(inode);
1237 static void yaffs_read_inode(struct inode *inode)
1239 /* NB This is called as a side effect of other functions, but
1240 * we had to release the lock to prevent deadlocks, so
1241 * need to lock again.
1244 struct yaffs_obj *obj;
1245 struct yaffs_dev *dev = yaffs_super_to_dev(inode->i_sb);
1247 yaffs_trace(YAFFS_TRACE_OS,
1248 "yaffs_read_inode for %d", (int)inode->i_ino);
1250 if (current != yaffs_dev_to_lc(dev)->readdir_process)
1251 yaffs_gross_lock(dev);
1253 obj = yaffs_find_by_number(dev, inode->i_ino);
1255 yaffs_fill_inode_from_obj(inode, obj);
1257 if (current != yaffs_dev_to_lc(dev)->readdir_process)
1258 yaffs_gross_unlock(dev);
1265 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
1266 struct yaffs_obj *obj)
1268 struct inode *inode;
1271 yaffs_trace(YAFFS_TRACE_OS,
1272 "yaffs_get_inode for NULL super_block!!");
1278 yaffs_trace(YAFFS_TRACE_OS,
1279 "yaffs_get_inode for NULL object!!");
1284 yaffs_trace(YAFFS_TRACE_OS,
1285 "yaffs_get_inode for object %d", obj->obj_id);
1287 inode = Y_IGET(sb, obj->obj_id);
1291 /* NB Side effect: iget calls back to yaffs_read_inode(). */
1292 /* iget also increments the inode's i_count */
1293 /* NB You can't be holding gross_lock or deadlock will happen! */
1300 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
1303 #define YCRED(x) (x->cred)
1306 #if LINUX_VERSION_CODE < KERNEL_VERSION(3,14,0)
1307 #define YPROC_uid(p) (YCRED(p)->fsuid)
1308 #define YPROC_gid(p) (YCRED(p)->fsgid)
1309 #define EXTRACT_gid(x) x
1310 #define EXTRACT_uid(x) x
1311 #define MAKE_gid(x) x
1312 #define MAKE_uid(x) x
1314 #define YPROC_uid(p) from_kuid(&init_user_ns, YCRED(p)->fsuid)
1315 #define YPROC_gid(p) from_kgid(&init_user_ns, YCRED(p)->fsgid)
1316 #define EXTRACT_gid(x) from_kgid(&init_user_ns, x)
1317 #define EXTRACT_uid(x) from_kuid(&init_user_ns, x)
1318 #define MAKE_gid(x) make_kgid(&init_user_ns, x)
1319 #define MAKE_uid(x) make_kuid(&init_user_ns, x)
1323 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 4, 0))
1324 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1326 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1327 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1330 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1334 struct inode *inode;
1336 struct yaffs_obj *obj = NULL;
1337 struct yaffs_dev *dev;
1339 struct yaffs_obj *parent = yaffs_inode_to_obj(dir);
1341 int error = -ENOSPC;
1342 uid_t uid = YPROC_uid(current);
1344 (dir->i_mode & S_ISGID) ? EXTRACT_gid(dir->i_gid) : YPROC_gid(current);
1346 if ((dir->i_mode & S_ISGID) && S_ISDIR(mode))
1350 yaffs_trace(YAFFS_TRACE_OS,
1351 "yaffs_mknod: parent object %d type %d",
1352 parent->obj_id, parent->variant_type);
1354 yaffs_trace(YAFFS_TRACE_OS,
1355 "yaffs_mknod: could not get parent object");
1359 yaffs_trace(YAFFS_TRACE_OS,
1360 "yaffs_mknod: making oject for %s, mode %x dev %x",
1361 dentry->d_name.name, mode, rdev);
1363 dev = parent->my_dev;
1365 yaffs_gross_lock(dev);
1367 switch (mode & S_IFMT) {
1369 /* Special (socket, fifo, device...) */
1370 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making special");
1371 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1373 yaffs_create_special(parent, dentry->d_name.name, mode, uid,
1374 gid, old_encode_dev(rdev));
1377 yaffs_create_special(parent, dentry->d_name.name, mode, uid,
1381 case S_IFREG: /* file */
1382 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making file");
1383 obj = yaffs_create_file(parent, dentry->d_name.name, mode, uid,
1386 case S_IFDIR: /* directory */
1387 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making directory");
1388 obj = yaffs_create_dir(parent, dentry->d_name.name, mode,
1391 case S_IFLNK: /* symlink */
1392 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making symlink");
1393 obj = NULL; /* Do we ever get here? */
1397 /* Can not call yaffs_get_inode() with gross lock held */
1398 yaffs_gross_unlock(dev);
1401 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
1402 d_instantiate(dentry, inode);
1403 update_dir_time(dir);
1404 yaffs_trace(YAFFS_TRACE_OS,
1405 "yaffs_mknod created object %d count = %d",
1406 obj->obj_id, atomic_read(&inode->i_count));
1408 yaffs_fill_inode_from_obj(dir, parent);
1410 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod failed making object");
1417 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 4, 0))
1418 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1420 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1424 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mkdir");
1425 ret_val = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
1430 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 6, 0))
1431 static int yaffs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
1433 #elif (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 4, 0))
1434 static int yaffs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
1435 struct nameidata *n)
1436 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1437 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
1438 struct nameidata *n)
1440 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
1443 yaffs_trace(YAFFS_TRACE_OS, "yaffs_create");
1444 return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
1447 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 6, 0))
1448 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
1450 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1451 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
1452 struct nameidata *n)
1454 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry)
1457 struct yaffs_obj *obj;
1458 struct inode *inode = NULL; /* NCB 2.5/2.6 needs NULL here */
1460 struct yaffs_dev *dev = yaffs_inode_to_obj(dir)->my_dev;
1462 if (current != yaffs_dev_to_lc(dev)->readdir_process)
1463 yaffs_gross_lock(dev);
1465 yaffs_trace(YAFFS_TRACE_OS, "yaffs_lookup for %d:%s",
1466 yaffs_inode_to_obj(dir)->obj_id, dentry->d_name.name);
1468 obj = yaffs_find_by_name(yaffs_inode_to_obj(dir), dentry->d_name.name);
1470 obj = yaffs_get_equivalent_obj(obj); /* in case it was a hardlink */
1472 /* Can't hold gross lock when calling yaffs_get_inode() */
1473 if (current != yaffs_dev_to_lc(dev)->readdir_process)
1474 yaffs_gross_unlock(dev);
1477 yaffs_trace(YAFFS_TRACE_OS,
1478 "yaffs_lookup found %d", obj->obj_id);
1480 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
1482 yaffs_trace(YAFFS_TRACE_OS, "yaffs_lookup not found");
1486 /* added NCB for 2.5/6 compatability - forces add even if inode is
1487 * NULL which creates dentry hash */
1488 d_add(dentry, inode);
1496 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
1497 struct dentry *dentry)
1499 struct inode *inode = old_dentry->d_inode;
1500 struct yaffs_obj *obj = NULL;
1501 struct yaffs_obj *link = NULL;
1502 struct yaffs_dev *dev;
1504 yaffs_trace(YAFFS_TRACE_OS, "yaffs_link");
1506 obj = yaffs_inode_to_obj(inode);
1509 yaffs_gross_lock(dev);
1511 if (!S_ISDIR(inode->i_mode)) /* Don't link directories */
1513 yaffs_link_obj(yaffs_inode_to_obj(dir), dentry->d_name.name,
1517 set_nlink(old_dentry->d_inode, yaffs_get_obj_link_count(obj));
1518 d_instantiate(dentry, old_dentry->d_inode);
1519 atomic_inc(&old_dentry->d_inode->i_count);
1520 yaffs_trace(YAFFS_TRACE_OS,
1521 "yaffs_link link count %d i_count %d",
1522 old_dentry->d_inode->i_nlink,
1523 atomic_read(&old_dentry->d_inode->i_count));
1526 yaffs_gross_unlock(dev);
1529 update_dir_time(dir);
1536 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
1537 const char *symname)
1539 struct yaffs_obj *obj;
1540 struct yaffs_dev *dev;
1541 uid_t uid = YPROC_uid(current);
1543 (dir->i_mode & S_ISGID) ? EXTRACT_gid(dir->i_gid) : YPROC_gid(current);
1545 yaffs_trace(YAFFS_TRACE_OS, "yaffs_symlink");
1547 if (strnlen(dentry->d_name.name, YAFFS_MAX_NAME_LENGTH + 1) >
1548 YAFFS_MAX_NAME_LENGTH)
1549 return -ENAMETOOLONG;
1551 if (strnlen(symname, YAFFS_MAX_ALIAS_LENGTH + 1) >
1552 YAFFS_MAX_ALIAS_LENGTH)
1553 return -ENAMETOOLONG;
1555 dev = yaffs_inode_to_obj(dir)->my_dev;
1556 yaffs_gross_lock(dev);
1557 obj = yaffs_create_symlink(yaffs_inode_to_obj(dir), dentry->d_name.name,
1558 S_IFLNK | S_IRWXUGO, uid, gid, symname);
1559 yaffs_gross_unlock(dev);
1562 struct inode *inode;
1564 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
1565 d_instantiate(dentry, inode);
1566 update_dir_time(dir);
1567 yaffs_trace(YAFFS_TRACE_OS, "symlink created OK");
1570 yaffs_trace(YAFFS_TRACE_OS, "symlink not created");
1577 * The VFS layer already does all the dentry stuff for rename.
1579 * NB: POSIX says you can rename an object over an old object of the same name
1581 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 9, 0))
1582 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
1583 struct inode *new_dir, struct dentry *new_dentry, unsigned int unused)
1585 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
1586 struct inode *new_dir, struct dentry *new_dentry)
1589 struct yaffs_dev *dev;
1590 int ret_val = YAFFS_FAIL;
1591 struct yaffs_obj *target;
1593 yaffs_trace(YAFFS_TRACE_OS, "yaffs_rename");
1594 dev = yaffs_inode_to_obj(old_dir)->my_dev;
1596 yaffs_gross_lock(dev);
1598 /* Check if the target is an existing directory that is not empty. */
1599 target = yaffs_find_by_name(yaffs_inode_to_obj(new_dir),
1600 new_dentry->d_name.name);
1602 if (target && target->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY &&
1603 !list_empty(&target->variant.dir_variant.children)) {
1605 yaffs_trace(YAFFS_TRACE_OS, "target is non-empty dir");
1607 ret_val = YAFFS_FAIL;
1609 /* Now does unlinking internally using shadowing mechanism */
1610 yaffs_trace(YAFFS_TRACE_OS, "calling yaffs_rename_obj");
1612 ret_val = yaffs_rename_obj(yaffs_inode_to_obj(old_dir),
1613 old_dentry->d_name.name,
1614 yaffs_inode_to_obj(new_dir),
1615 new_dentry->d_name.name);
1617 yaffs_gross_unlock(dev);
1619 if (ret_val == YAFFS_OK) {
1621 inode_dec_link_count(new_dentry->d_inode);
1623 update_dir_time(old_dir);
1624 if (old_dir != new_dir)
1625 update_dir_time(new_dir);
1635 static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
1639 struct yaffs_dev *dev;
1640 struct yaffs_obj *obj;
1642 yaffs_trace(YAFFS_TRACE_OS, "yaffs_unlink %d:%s",
1643 (int)(dir->i_ino), dentry->d_name.name);
1644 obj = yaffs_inode_to_obj(dir);
1647 yaffs_gross_lock(dev);
1649 ret_val = yaffs_unlinker(obj, dentry->d_name.name);
1651 if (ret_val == YAFFS_OK) {
1652 inode_dec_link_count(dentry->d_inode);
1654 yaffs_gross_unlock(dev);
1655 update_dir_time(dir);
1658 yaffs_gross_unlock(dev);
1664 static const struct inode_operations yaffs_dir_inode_operations = {
1665 .create = yaffs_create,
1666 .lookup = yaffs_lookup,
1668 .unlink = yaffs_unlink,
1669 .symlink = yaffs_symlink,
1670 .mkdir = yaffs_mkdir,
1671 .rmdir = yaffs_unlink,
1672 .mknod = yaffs_mknod,
1673 .rename = yaffs_rename,
1674 .setattr = yaffs_setattr,
1675 .listxattr = yaffs_listxattr,
1676 #ifdef YAFFS_USE_XATTR
1677 .setxattr = yaffs_setxattr,
1678 .getxattr = yaffs_getxattr,
1679 .removexattr = yaffs_removexattr,
1683 /*-----------------------------------------------------------------*/
1684 /* Directory search context allows us to unlock access to yaffs during
1685 * filldir without causing problems with the directory being modified.
1686 * This is similar to the tried and tested mechanism used in yaffs direct.
1688 * A search context iterates along a doubly linked list of siblings in the
1689 * directory. If the iterating object is deleted then this would corrupt
1690 * the list iteration, likely causing a crash. The search context avoids
1691 * this by using the remove_obj_fn to move the search context to the
1692 * next object before the object is deleted.
1694 * Many readdirs (and thus seach conexts) may be alive simulateously so
1695 * each struct yaffs_dev has a list of these.
1697 * A seach context lives for the duration of a readdir.
1699 * All these functions must be called while yaffs is locked.
1702 struct yaffs_search_context {
1703 struct yaffs_dev *dev;
1704 struct yaffs_obj *dir_obj;
1705 struct yaffs_obj *next_return;
1706 struct list_head others;
1710 * yaffs_new_search() creates a new search context, initialises it and
1711 * adds it to the device's search context list.
1713 * Called at start of readdir.
1715 static struct yaffs_search_context *yaffs_new_search(struct yaffs_obj *dir)
1717 struct yaffs_dev *dev = dir->my_dev;
1718 struct yaffs_search_context *sc =
1719 kmalloc(sizeof(struct yaffs_search_context), GFP_NOFS);
1723 if (list_empty(&sc->dir_obj->variant.dir_variant.children))
1724 sc->next_return = NULL;
1727 list_entry(dir->variant.dir_variant.children.next,
1728 struct yaffs_obj, siblings);
1729 INIT_LIST_HEAD(&sc->others);
1730 list_add(&sc->others, &(yaffs_dev_to_lc(dev)->search_contexts));
1736 * yaffs_search_end() disposes of a search context and cleans up.
1738 static void yaffs_search_end(struct yaffs_search_context *sc)
1741 list_del(&sc->others);
1747 * yaffs_search_advance() moves a search context to the next object.
1748 * Called when the search iterates or when an object removal causes
1749 * the search context to be moved to the next object.
1751 static void yaffs_search_advance(struct yaffs_search_context *sc)
1756 if (sc->next_return == NULL ||
1757 list_empty(&sc->dir_obj->variant.dir_variant.children))
1758 sc->next_return = NULL;
1760 struct list_head *next = sc->next_return->siblings.next;
1762 if (next == &sc->dir_obj->variant.dir_variant.children)
1763 sc->next_return = NULL; /* end of list */
1766 list_entry(next, struct yaffs_obj, siblings);
1771 * yaffs_remove_obj_callback() is called when an object is unlinked.
1772 * We check open search contexts and advance any which are currently
1773 * on the object being iterated.
1775 static void yaffs_remove_obj_callback(struct yaffs_obj *obj)
1778 struct list_head *i;
1779 struct yaffs_search_context *sc;
1780 struct list_head *search_contexts =
1781 &(yaffs_dev_to_lc(obj->my_dev)->search_contexts);
1783 /* Iterate through the directory search contexts.
1784 * If any are currently on the object being removed, then advance
1785 * the search context to the next object to prevent a hanging pointer.
1787 list_for_each(i, search_contexts) {
1788 sc = list_entry(i, struct yaffs_search_context, others);
1789 if (sc->next_return == obj)
1790 yaffs_search_advance(sc);
1796 /*-----------------------------------------------------------------*/
1798 #ifdef YAFFS_USE_DIR_ITERATE
1799 static int yaffs_iterate(struct file *f, struct dir_context *dc)
1801 struct yaffs_obj *obj;
1802 struct yaffs_dev *dev;
1803 struct yaffs_search_context *sc;
1804 unsigned long curoffs;
1805 struct yaffs_obj *l;
1808 char name[YAFFS_MAX_NAME_LENGTH + 1];
1810 obj = yaffs_dentry_to_obj(Y_GET_DENTRY(f));
1813 yaffs_gross_lock(dev);
1815 yaffs_dev_to_lc(dev)->readdir_process = current;
1817 sc = yaffs_new_search(obj);
1823 if (!dir_emit_dots(f, dc))
1828 while (sc->next_return) {
1830 l = sc->next_return;
1831 if (curoffs >= dc->pos) {
1832 int this_inode = yaffs_get_obj_inode(l);
1833 int this_type = yaffs_get_obj_type(l);
1835 yaffs_get_obj_name(l, name, YAFFS_MAX_NAME_LENGTH + 1);
1836 yaffs_trace(YAFFS_TRACE_OS,
1837 "yaffs_readdir: %s inode %d",
1838 name, yaffs_get_obj_inode(l));
1840 yaffs_gross_unlock(dev);
1847 yaffs_gross_lock(dev);
1851 yaffs_gross_lock(dev);
1856 yaffs_search_advance(sc);
1860 yaffs_search_end(sc);
1861 yaffs_dev_to_lc(dev)->readdir_process = NULL;
1862 yaffs_gross_unlock(dev);
1869 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
1871 struct yaffs_obj *obj;
1872 struct yaffs_dev *dev;
1873 struct yaffs_search_context *sc;
1874 struct inode *inode = Y_GET_DENTRY(f)->d_inode;
1875 unsigned long offset, curoffs;
1876 struct yaffs_obj *l;
1879 char name[YAFFS_MAX_NAME_LENGTH + 1];
1881 obj = yaffs_dentry_to_obj(Y_GET_DENTRY(f));
1884 yaffs_gross_lock(dev);
1886 yaffs_dev_to_lc(dev)->readdir_process = current;
1890 sc = yaffs_new_search(obj);
1896 yaffs_trace(YAFFS_TRACE_OS,
1897 "yaffs_readdir: starting at %d", (int)offset);
1900 yaffs_trace(YAFFS_TRACE_OS,
1901 "yaffs_readdir: entry . ino %d",
1903 yaffs_gross_unlock(dev);
1904 if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0) {
1905 yaffs_gross_lock(dev);
1908 yaffs_gross_lock(dev);
1913 yaffs_trace(YAFFS_TRACE_OS,
1914 "yaffs_readdir: entry .. ino %d",
1915 (int)f->f_dentry->d_parent->d_inode->i_ino);
1916 yaffs_gross_unlock(dev);
1917 if (filldir(dirent, "..", 2, offset,
1918 f->f_dentry->d_parent->d_inode->i_ino,
1920 yaffs_gross_lock(dev);
1923 yaffs_gross_lock(dev);
1930 /* If the directory has changed since the open or last call to
1931 readdir, rewind to after the 2 canned entries. */
1932 if (f->f_version != inode->i_version) {
1935 f->f_version = inode->i_version;
1938 while (sc->next_return) {
1940 l = sc->next_return;
1941 if (curoffs >= offset) {
1942 int this_inode = yaffs_get_obj_inode(l);
1943 int this_type = yaffs_get_obj_type(l);
1945 yaffs_get_obj_name(l, name, YAFFS_MAX_NAME_LENGTH + 1);
1946 yaffs_trace(YAFFS_TRACE_OS,
1947 "yaffs_readdir: %s inode %d",
1948 name, yaffs_get_obj_inode(l));
1950 yaffs_gross_unlock(dev);
1955 offset, this_inode, this_type) < 0) {
1956 yaffs_gross_lock(dev);
1960 yaffs_gross_lock(dev);
1965 yaffs_search_advance(sc);
1969 yaffs_search_end(sc);
1970 yaffs_dev_to_lc(dev)->readdir_process = NULL;
1971 yaffs_gross_unlock(dev);
1978 static const struct file_operations yaffs_dir_operations = {
1979 .read = generic_read_dir,
1980 #ifdef YAFFS_USE_DIR_ITERATE
1981 .iterate = yaffs_iterate,
1983 .readdir = yaffs_readdir,
1985 .fsync = yaffs_sync_object,
1986 .llseek = generic_file_llseek,
1989 static void yaffs_fill_inode_from_obj(struct inode *inode,
1990 struct yaffs_obj *obj)
1994 /* Check mode against the variant type and attempt to repair if broken. */
1995 u32 mode = obj->yst_mode;
1996 switch (obj->variant_type) {
1997 case YAFFS_OBJECT_TYPE_FILE:
1998 if (!S_ISREG(mode)) {
1999 obj->yst_mode &= ~S_IFMT;
2000 obj->yst_mode |= S_IFREG;
2004 case YAFFS_OBJECT_TYPE_SYMLINK:
2005 if (!S_ISLNK(mode)) {
2006 obj->yst_mode &= ~S_IFMT;
2007 obj->yst_mode |= S_IFLNK;
2011 case YAFFS_OBJECT_TYPE_DIRECTORY:
2012 if (!S_ISDIR(mode)) {
2013 obj->yst_mode &= ~S_IFMT;
2014 obj->yst_mode |= S_IFDIR;
2018 case YAFFS_OBJECT_TYPE_UNKNOWN:
2019 case YAFFS_OBJECT_TYPE_HARDLINK:
2020 case YAFFS_OBJECT_TYPE_SPECIAL:
2026 inode->i_flags |= S_NOATIME;
2028 inode->i_ino = obj->obj_id;
2029 inode->i_mode = obj->yst_mode;
2030 inode->i_uid = MAKE_uid(obj->yst_uid);
2031 inode->i_gid = MAKE_gid(obj->yst_gid);
2032 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
2033 inode->i_blksize = inode->i_sb->s_blocksize;
2035 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2037 inode->i_rdev = old_decode_dev(obj->yst_rdev);
2038 inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
2039 inode->i_atime.tv_nsec = 0;
2040 inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
2041 inode->i_mtime.tv_nsec = 0;
2042 inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
2043 inode->i_ctime.tv_nsec = 0;
2045 inode->i_rdev = obj->yst_rdev;
2046 inode->i_atime = obj->yst_atime;
2047 inode->i_mtime = obj->yst_mtime;
2048 inode->i_ctime = obj->yst_ctime;
2050 inode->i_size = yaffs_get_obj_length(obj);
2051 inode->i_blocks = (inode->i_size + 511) >> 9;
2053 set_nlink(inode, yaffs_get_obj_link_count(obj));
2055 yaffs_trace(YAFFS_TRACE_OS,
2056 "yaffs_fill_inode mode %x uid %d gid %d size %lld count %d",
2057 inode->i_mode, obj->yst_uid, obj->yst_gid,
2058 inode->i_size, atomic_read(&inode->i_count));
2060 switch (obj->yst_mode & S_IFMT) {
2061 default: /* fifo, device or socket */
2062 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2063 init_special_inode(inode, obj->yst_mode,
2064 old_decode_dev(obj->yst_rdev));
2066 init_special_inode(inode, obj->yst_mode,
2067 (dev_t) (obj->yst_rdev));
2070 case S_IFREG: /* file */
2071 inode->i_op = &yaffs_file_inode_operations;
2072 inode->i_fop = &yaffs_file_operations;
2073 inode->i_mapping->a_ops =
2074 &yaffs_file_address_operations;
2076 case S_IFDIR: /* directory */
2077 inode->i_op = &yaffs_dir_inode_operations;
2078 inode->i_fop = &yaffs_dir_operations;
2080 case S_IFLNK: /* symlink */
2081 inode->i_op = &yaffs_symlink_inode_operations;
2085 yaffs_inode_to_obj_lv(inode) = obj;
2087 obj->my_inode = inode;
2090 yaffs_trace(YAFFS_TRACE_OS,
2091 "yaffs_fill_inode invalid parameters");
2099 * yaffs background thread functions .
2100 * yaffs_bg_thread_fn() the thread function
2101 * yaffs_bg_start() launches the background thread.
2102 * yaffs_bg_stop() cleans up the background thread.
2105 * The thread should only run after the yaffs is initialised
2106 * The thread should be stopped before yaffs is unmounted.
2107 * The thread should not do any writing while the fs is in read only.
2110 static unsigned yaffs_bg_gc_urgency(struct yaffs_dev *dev)
2112 unsigned erased_chunks =
2113 dev->n_erased_blocks * dev->param.chunks_per_block;
2114 struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
2115 unsigned scattered = 0; /* Free chunks not in an erased block */
2117 if (erased_chunks < dev->n_free_chunks)
2118 scattered = (dev->n_free_chunks - erased_chunks);
2120 if (!context->bg_running)
2122 else if (scattered < (dev->param.chunks_per_block * 2))
2124 else if (erased_chunks > dev->n_free_chunks / 2)
2126 else if (erased_chunks > dev->n_free_chunks / 4)
2132 #ifdef YAFFS_COMPILE_BACKGROUND
2134 void yaffs_background_waker(unsigned long data)
2136 wake_up_process((struct task_struct *)data);
2139 static int yaffs_bg_thread_fn(void *data)
2141 struct yaffs_dev *dev = (struct yaffs_dev *)data;
2142 struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
2143 unsigned long now = jiffies;
2144 unsigned long next_dir_update = now;
2145 unsigned long next_gc = now;
2146 unsigned long expires;
2147 unsigned int urgency;
2150 struct timer_list timer;
2152 yaffs_trace(YAFFS_TRACE_BACKGROUND,
2153 "yaffs_background starting for dev %p", (void *)dev);
2155 #ifdef YAFFS_COMPILE_FREEZER
2158 while (context->bg_running) {
2159 yaffs_trace(YAFFS_TRACE_BACKGROUND, "yaffs_background");
2161 if (kthread_should_stop())
2164 #ifdef YAFFS_COMPILE_FREEZER
2165 if (try_to_freeze())
2168 yaffs_gross_lock(dev);
2172 if (time_after(now, next_dir_update) && yaffs_bg_enable) {
2173 yaffs_update_dirty_dirs(dev);
2174 next_dir_update = now + HZ;
2177 if (time_after(now, next_gc) && yaffs_bg_enable) {
2178 if (!dev->is_checkpointed) {
2179 urgency = yaffs_bg_gc_urgency(dev);
2180 gc_result = yaffs_bg_gc(dev, urgency);
2182 next_gc = now + HZ / 20 + 1;
2183 else if (urgency > 0)
2184 next_gc = now + HZ / 10 + 1;
2186 next_gc = now + HZ * 2;
2189 * gc not running so set to next_dir_update
2190 * to cut down on wake ups
2192 next_gc = next_dir_update;
2195 yaffs_gross_unlock(dev);
2197 expires = next_dir_update;
2198 if (time_before(next_gc, expires))
2200 if (time_before(expires, now))
2203 Y_INIT_TIMER(&timer);
2204 timer.expires = expires + 1;
2205 timer.data = (unsigned long)current;
2206 timer.function = yaffs_background_waker;
2208 set_current_state(TASK_INTERRUPTIBLE);
2211 del_timer_sync(&timer);
2220 static int yaffs_bg_start(struct yaffs_dev *dev)
2223 struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
2228 context->bg_running = 1;
2230 context->bg_thread = kthread_run(yaffs_bg_thread_fn,
2231 (void *)dev, "yaffs-bg-%d",
2234 if (IS_ERR(context->bg_thread)) {
2235 retval = PTR_ERR(context->bg_thread);
2236 context->bg_thread = NULL;
2237 context->bg_running = 0;
2242 static void yaffs_bg_stop(struct yaffs_dev *dev)
2244 struct yaffs_linux_context *ctxt = yaffs_dev_to_lc(dev);
2246 ctxt->bg_running = 0;
2248 if (ctxt->bg_thread) {
2249 kthread_stop(ctxt->bg_thread);
2250 ctxt->bg_thread = NULL;
2254 static int yaffs_bg_thread_fn(void *data)
2259 static int yaffs_bg_start(struct yaffs_dev *dev)
2264 static void yaffs_bg_stop(struct yaffs_dev *dev)
2270 static void yaffs_flush_inodes(struct super_block *sb)
2273 struct yaffs_obj *obj;
2275 list_for_each_entry(iptr, &sb->s_inodes, i_sb_list) {
2276 obj = yaffs_inode_to_obj(iptr);
2278 yaffs_trace(YAFFS_TRACE_OS,
2281 yaffs_flush_file(obj, 1, 0, 0);
2286 static void yaffs_flush_super(struct super_block *sb, int do_checkpoint)
2288 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
2292 yaffs_flush_inodes(sb);
2293 yaffs_update_dirty_dirs(dev);
2294 yaffs_flush_whole_cache(dev, 1);
2296 yaffs_checkpoint_save(dev);
2299 static LIST_HEAD(yaffs_context_list);
2300 struct mutex yaffs_context_lock;
2302 static void yaffs_put_super(struct super_block *sb)
2304 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
2305 struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
2307 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_ALWAYS,
2310 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
2311 "Shutting down yaffs background thread");
2313 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
2314 "yaffs background thread shut down");
2316 yaffs_gross_lock(dev);
2318 yaffs_flush_super(sb, 1);
2320 yaffs_deinitialise(dev);
2322 yaffs_gross_unlock(dev);
2324 mutex_lock(&yaffs_context_lock);
2325 list_del_init(&(yaffs_dev_to_lc(dev)->context_list));
2326 mutex_unlock(&yaffs_context_lock);
2328 if (yaffs_dev_to_lc(dev)->spare_buffer) {
2329 kfree(yaffs_dev_to_lc(dev)->spare_buffer);
2330 yaffs_dev_to_lc(dev)->spare_buffer = NULL;
2335 yaffs_put_mtd_device(mtd);
2337 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_ALWAYS,
2338 "yaffs_put_super done");
2342 static unsigned yaffs_gc_control_callback(struct yaffs_dev *dev)
2344 return yaffs_gc_control;
2348 #ifdef YAFFS_COMPILE_EXPORTFS
2350 static struct inode *yaffs2_nfs_get_inode(struct super_block *sb, uint64_t ino,
2351 uint32_t generation)
2353 return Y_IGET(sb, ino);
2356 static struct dentry *yaffs2_fh_to_dentry(struct super_block *sb,
2357 struct fid *fid, int fh_len,
2360 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
2361 yaffs2_nfs_get_inode);
2364 static struct dentry *yaffs2_fh_to_parent(struct super_block *sb,
2365 struct fid *fid, int fh_len,
2368 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
2369 yaffs2_nfs_get_inode);
2372 struct dentry *yaffs2_get_parent(struct dentry *dentry)
2375 struct super_block *sb = dentry->d_inode->i_sb;
2376 struct dentry *parent = ERR_PTR(-ENOENT);
2377 struct inode *inode;
2378 unsigned long parent_ino;
2379 struct yaffs_obj *d_obj;
2380 struct yaffs_obj *parent_obj;
2382 d_obj = yaffs_inode_to_obj(dentry->d_inode);
2385 parent_obj = d_obj->parent;
2387 parent_ino = yaffs_get_obj_inode(parent_obj);
2388 inode = Y_IGET(sb, parent_ino);
2390 if (IS_ERR(inode)) {
2391 parent = ERR_CAST(inode);
2393 parent = d_obtain_alias(inode);
2394 if (!IS_ERR(parent)) {
2395 parent = ERR_PTR(-ENOMEM);
2405 /* Just declare a zero structure as a NULL value implies
2406 * using the default functions of exportfs.
2409 static struct export_operations yaffs_export_ops = {
2410 .fh_to_dentry = yaffs2_fh_to_dentry,
2411 .fh_to_parent = yaffs2_fh_to_parent,
2412 .get_parent = yaffs2_get_parent,
2417 static void yaffs_unstitch_obj(struct inode *inode, struct yaffs_obj *obj)
2419 /* Clear the association between the inode and
2420 * the struct yaffs_obj.
2422 obj->my_inode = NULL;
2423 yaffs_inode_to_obj_lv(inode) = NULL;
2425 /* If the object freeing was deferred, then the real
2427 * This should fix the inode inconsistency problem.
2429 yaffs_handle_defered_free(obj);
2432 #ifdef YAFFS_HAS_EVICT_INODE
2433 /* yaffs_evict_inode combines into one operation what was previously done in
2434 * yaffs_clear_inode() and yaffs_delete_inode()
2437 static void yaffs_evict_inode(struct inode *inode)
2439 struct yaffs_obj *obj;
2440 struct yaffs_dev *dev;
2443 obj = yaffs_inode_to_obj(inode);
2445 yaffs_trace(YAFFS_TRACE_OS,
2446 "yaffs_evict_inode: ino %d, count %d %s",
2447 (int)inode->i_ino, atomic_read(&inode->i_count),
2448 obj ? "object exists" : "null object");
2450 if (!inode->i_nlink && !is_bad_inode(inode))
2452 truncate_inode_pages(&inode->i_data, 0);
2453 Y_CLEAR_INODE(inode);
2455 if (deleteme && obj) {
2457 yaffs_gross_lock(dev);
2459 yaffs_gross_unlock(dev);
2463 yaffs_gross_lock(dev);
2464 yaffs_unstitch_obj(inode, obj);
2465 yaffs_gross_unlock(dev);
2470 /* clear is called to tell the fs to release any per-inode data it holds.
2471 * The object might still exist on disk and is just being thrown out of the cache
2472 * or else the object has actually been deleted and we're being called via
2474 * yaffs_delete_inode() -> clear_inode()->yaffs_clear_inode()
2477 static void yaffs_clear_inode(struct inode *inode)
2479 struct yaffs_obj *obj;
2480 struct yaffs_dev *dev;
2482 obj = yaffs_inode_to_obj(inode);
2484 yaffs_trace(YAFFS_TRACE_OS,
2485 "yaffs_clear_inode: ino %d, count %d %s",
2486 (int)inode->i_ino, atomic_read(&inode->i_count),
2487 obj ? "object exists" : "null object");
2491 yaffs_gross_lock(dev);
2492 yaffs_unstitch_obj(inode, obj);
2493 yaffs_gross_unlock(dev);
2498 /* delete is called when the link count is zero and the inode
2499 * is put (ie. nobody wants to know about it anymore, time to
2501 * NB Must call clear_inode()
2503 static void yaffs_delete_inode(struct inode *inode)
2505 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
2506 struct yaffs_dev *dev;
2508 yaffs_trace(YAFFS_TRACE_OS,
2509 "yaffs_delete_inode: ino %d, count %d %s",
2510 (int)inode->i_ino, atomic_read(&inode->i_count),
2511 obj ? "object exists" : "null object");
2515 yaffs_gross_lock(dev);
2517 yaffs_gross_unlock(dev);
2519 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
2520 truncate_inode_pages(&inode->i_data, 0);
2529 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2530 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
2532 struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
2533 struct super_block *sb = dentry->d_sb;
2534 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2535 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
2537 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
2539 static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
2541 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
2544 yaffs_trace(YAFFS_TRACE_OS, "yaffs_statfs");
2546 yaffs_gross_lock(dev);
2548 buf->f_type = YAFFS_MAGIC;
2549 buf->f_bsize = sb->s_blocksize;
2550 buf->f_namelen = 255;
2552 if (dev->data_bytes_per_chunk & (dev->data_bytes_per_chunk - 1)) {
2553 /* Do this if chunk size is not a power of 2 */
2555 uint64_t bytes_in_dev;
2556 uint64_t bytes_free;
2560 ((dev->param.end_block - dev->param.start_block +
2561 1))) * ((uint64_t) (dev->param.chunks_per_block *
2562 dev->data_bytes_per_chunk));
2564 do_div(bytes_in_dev, sb->s_blocksize); /* bytes_in_dev becomes the number of blocks */
2565 buf->f_blocks = bytes_in_dev;
2567 bytes_free = ((uint64_t) (yaffs_get_n_free_chunks(dev))) *
2568 ((uint64_t) (dev->data_bytes_per_chunk));
2570 do_div(bytes_free, sb->s_blocksize);
2572 buf->f_bfree = bytes_free;
2574 } else if (sb->s_blocksize > dev->data_bytes_per_chunk) {
2577 (dev->param.end_block - dev->param.start_block + 1) *
2578 dev->param.chunks_per_block /
2579 (sb->s_blocksize / dev->data_bytes_per_chunk);
2581 yaffs_get_n_free_chunks(dev) /
2582 (sb->s_blocksize / dev->data_bytes_per_chunk);
2585 (dev->param.end_block - dev->param.start_block + 1) *
2586 dev->param.chunks_per_block *
2587 (dev->data_bytes_per_chunk / sb->s_blocksize);
2590 yaffs_get_n_free_chunks(dev) *
2591 (dev->data_bytes_per_chunk / sb->s_blocksize);
2596 buf->f_bavail = buf->f_bfree;
2598 yaffs_gross_unlock(dev);
2604 static int yaffs_do_sync_fs(struct super_block *sb, int request_checkpoint)
2607 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
2608 unsigned int oneshot_checkpoint = (yaffs_auto_checkpoint & 4);
2609 unsigned gc_urgent = yaffs_bg_gc_urgency(dev);
2611 int dirty = yaffs_check_super_dirty(dev);
2613 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
2614 "yaffs_do_sync_fs: gc-urgency %d %s %s%s",
2616 dirty ? "dirty" : "clean",
2617 request_checkpoint ? "checkpoint requested" : "no checkpoint",
2618 oneshot_checkpoint ? " one-shot" : "");
2620 yaffs_gross_lock(dev);
2621 do_checkpoint = ((request_checkpoint && !gc_urgent) ||
2622 oneshot_checkpoint) && !dev->is_checkpointed;
2624 if (dirty || do_checkpoint) {
2625 yaffs_flush_super(sb, !dev->is_checkpointed && do_checkpoint);
2626 yaffs_clear_super_dirty(dev);
2627 if (oneshot_checkpoint)
2628 yaffs_auto_checkpoint &= ~4;
2630 yaffs_gross_unlock(dev);
2636 #ifdef YAFFS_HAS_WRITE_SUPER
2637 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2638 static void yaffs_write_super(struct super_block *sb)
2640 static int yaffs_write_super(struct super_block *sb)
2643 unsigned request_checkpoint = (yaffs_auto_checkpoint >= 2);
2645 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
2646 "yaffs_write_super %s",
2647 request_checkpoint ? " checkpt" : "");
2649 yaffs_do_sync_fs(sb, request_checkpoint);
2651 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 18))
2657 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2658 static int yaffs_sync_fs(struct super_block *sb, int wait)
2660 static int yaffs_sync_fs(struct super_block *sb)
2663 unsigned request_checkpoint = (yaffs_auto_checkpoint >= 1);
2665 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
2666 "yaffs_sync_fs%s", request_checkpoint ? " checkpt" : "");
2668 yaffs_do_sync_fs(sb, request_checkpoint);
2673 /* the function only is used to change dev->read_only when this file system
2676 static int yaffs_remount_fs(struct super_block *sb, int *flags, char *data)
2679 struct mtd_info *mtd;
2680 struct yaffs_dev *dev = 0;
2682 /* Get the device */
2683 mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
2685 yaffs_trace(YAFFS_TRACE_ALWAYS,
2686 "MTD device #%u doesn't appear to exist",
2691 /* Check it's NAND */
2692 if (mtd->type != MTD_NANDFLASH) {
2693 yaffs_trace(YAFFS_TRACE_ALWAYS,
2694 "MTD device is not NAND it's type %d",
2699 read_only = ((*flags & MS_RDONLY) != 0);
2700 if (!read_only && !(mtd->flags & MTD_WRITEABLE)) {
2703 "yaffs: mtd is read only, setting superblock read only");
2704 *flags |= MS_RDONLY;
2707 dev = sb->s_fs_info;
2708 dev->read_only = read_only;
2713 static const struct super_operations yaffs_super_ops = {
2714 .statfs = yaffs_statfs,
2716 #ifndef YAFFS_USE_OWN_IGET
2717 .read_inode = yaffs_read_inode,
2719 #ifdef YAFFS_HAS_PUT_INODE
2720 .put_inode = yaffs_put_inode,
2722 .put_super = yaffs_put_super,
2723 #ifdef YAFFS_HAS_EVICT_INODE
2724 .evict_inode = yaffs_evict_inode,
2726 .delete_inode = yaffs_delete_inode,
2727 .clear_inode = yaffs_clear_inode,
2729 .sync_fs = yaffs_sync_fs,
2730 #ifdef YAFFS_HAS_WRITE_SUPER
2731 .write_super = yaffs_write_super,
2733 .remount_fs = yaffs_remount_fs,
2736 struct yaffs_options {
2738 int skip_checkpoint_read;
2739 int skip_checkpoint_write;
2742 int tags_ecc_overridden;
2743 int lazy_loading_enabled;
2744 int lazy_loading_overridden;
2745 int empty_lost_and_found;
2746 int empty_lost_and_found_overridden;
2747 int disable_summary;
2750 #define MAX_OPT_LEN 30
2751 static int yaffs_parse_options(struct yaffs_options *options,
2752 const char *options_str)
2754 char cur_opt[MAX_OPT_LEN + 1];
2758 /* Parse through the options which is a comma seperated list */
2760 while (options_str && *options_str && !error) {
2761 memset(cur_opt, 0, MAX_OPT_LEN + 1);
2764 while (*options_str == ',')
2767 while (*options_str && *options_str != ',') {
2768 if (p < MAX_OPT_LEN) {
2769 cur_opt[p] = *options_str;
2775 if (!strcmp(cur_opt, "inband-tags")) {
2776 options->inband_tags = 1;
2777 } else if (!strcmp(cur_opt, "tags-ecc-off")) {
2778 options->tags_ecc_on = 0;
2779 options->tags_ecc_overridden = 1;
2780 } else if (!strcmp(cur_opt, "tags-ecc-on")) {
2781 options->tags_ecc_on = 1;
2782 options->tags_ecc_overridden = 1;
2783 } else if (!strcmp(cur_opt, "lazy-loading-off")) {
2784 options->lazy_loading_enabled = 0;
2785 options->lazy_loading_overridden = 1;
2786 } else if (!strcmp(cur_opt, "lazy-loading-on")) {
2787 options->lazy_loading_enabled = 1;
2788 options->lazy_loading_overridden = 1;
2789 } else if (!strcmp(cur_opt, "disable-summary")) {
2790 options->disable_summary = 1;
2791 } else if (!strcmp(cur_opt, "empty-lost-and-found-off")) {
2792 options->empty_lost_and_found = 0;
2793 options->empty_lost_and_found_overridden = 1;
2794 } else if (!strcmp(cur_opt, "empty-lost-and-found-on")) {
2795 options->empty_lost_and_found = 1;
2796 options->empty_lost_and_found_overridden = 1;
2797 } else if (!strcmp(cur_opt, "no-cache")) {
2798 options->no_cache = 1;
2799 } else if (!strcmp(cur_opt, "no-checkpoint-read")) {
2800 options->skip_checkpoint_read = 1;
2801 } else if (!strcmp(cur_opt, "no-checkpoint-write")) {
2802 options->skip_checkpoint_write = 1;
2803 } else if (!strcmp(cur_opt, "no-checkpoint")) {
2804 options->skip_checkpoint_read = 1;
2805 options->skip_checkpoint_write = 1;
2807 printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n",
2817 static struct dentry *yaffs_make_root(struct inode *inode)
2819 #if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0))
2820 struct dentry *root = d_alloc_root(inode);
2827 return d_make_root(inode);
2834 static struct super_block *yaffs_internal_read_super(int yaffs_version,
2835 struct super_block *sb,
2836 void *data, int silent)
2839 struct inode *inode = NULL;
2840 struct dentry *root;
2841 struct yaffs_dev *dev = 0;
2842 char devname_buf[BDEVNAME_SIZE + 1];
2843 struct mtd_info *mtd;
2845 char *data_str = (char *)data;
2846 struct yaffs_linux_context *context = NULL;
2847 struct yaffs_param *param;
2850 int inband_tags = 0;
2852 struct yaffs_options options;
2856 struct yaffs_linux_context *context_iterator;
2857 struct list_head *l;
2860 printk(KERN_INFO "yaffs: sb is NULL\n");
2864 sb->s_magic = YAFFS_MAGIC;
2865 sb->s_op = &yaffs_super_ops;
2866 sb->s_flags |= MS_NOATIME;
2868 read_only = ((sb->s_flags & MS_RDONLY) != 0);
2870 #ifdef YAFFS_COMPILE_EXPORTFS
2871 sb->s_export_op = &yaffs_export_ops;
2875 printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
2876 else if (!yaffs_devname(sb, devname_buf))
2877 printk(KERN_INFO "yaffs: devname is NULL\n");
2879 printk(KERN_INFO "yaffs: dev is %d name is \"%s\" %s\n",
2881 yaffs_devname(sb, devname_buf), read_only ? "ro" : "rw");
2886 printk(KERN_INFO "yaffs: passed flags \"%s\"\n", data_str);
2888 memset(&options, 0, sizeof(options));
2890 if (yaffs_parse_options(&options, data_str)) {
2891 /* Option parsing failed */
2895 sb->s_blocksize = PAGE_CACHE_SIZE;
2896 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
2898 yaffs_trace(YAFFS_TRACE_OS,
2899 "yaffs_read_super: Using yaffs%d", yaffs_version);
2900 yaffs_trace(YAFFS_TRACE_OS,
2901 "yaffs_read_super: block size %d", (int)(sb->s_blocksize));
2903 yaffs_trace(YAFFS_TRACE_ALWAYS,
2904 "yaffs: Attempting MTD mount of %u.%u,\"%s\"",
2905 MAJOR(sb->s_dev), MINOR(sb->s_dev),
2906 yaffs_devname(sb, devname_buf));
2908 /* Get the device */
2909 mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
2911 yaffs_trace(YAFFS_TRACE_ALWAYS,
2912 "yaffs: MTD device %u either not valid or unavailable",
2917 if (yaffs_auto_select && yaffs_version == 1 && WRITE_SIZE(mtd) >= 2048) {
2918 yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs2");
2922 /* Added NCB 26/5/2006 for completeness */
2923 if (yaffs_version == 2 && !options.inband_tags
2924 && WRITE_SIZE(mtd) == 512) {
2925 yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs1");
2929 if (mtd->oobavail < sizeof(struct yaffs_packed_tags2) ||
2930 options.inband_tags)
2933 if(yaffs_verify_mtd(mtd, yaffs_version, inband_tags) < 0)
2936 /* OK, so if we got here, we have an MTD that's NAND and looks
2937 * like it has the right capabilities
2938 * Set the struct yaffs_dev up for mtd
2941 if (!read_only && !(mtd->flags & MTD_WRITEABLE)) {
2944 "yaffs: mtd is read only, setting superblock read only\n"
2946 sb->s_flags |= MS_RDONLY;
2949 dev = kmalloc(sizeof(struct yaffs_dev), GFP_KERNEL);
2950 context = kmalloc(sizeof(struct yaffs_linux_context), GFP_KERNEL);
2952 if (!dev || !context) {
2958 /* Deep shit could not allocate device structure */
2959 yaffs_trace(YAFFS_TRACE_ALWAYS,
2960 "yaffs_read_super: Failed trying to allocate struct yaffs_dev."
2964 memset(dev, 0, sizeof(struct yaffs_dev));
2965 param = &(dev->param);
2967 memset(context, 0, sizeof(struct yaffs_linux_context));
2968 dev->os_context = context;
2969 INIT_LIST_HEAD(&(context->context_list));
2971 context->super = sb;
2973 dev->read_only = read_only;
2975 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2976 sb->s_fs_info = dev;
2978 sb->u.generic_sbp = dev;
2982 dev->driver_context = mtd;
2983 param->name = mtd->name;
2985 /* Set up the memory size parameters.... */
2988 param->n_reserved_blocks = 5;
2989 param->n_caches = (options.no_cache) ? 0 : 10;
2990 param->inband_tags = inband_tags;
2992 param->enable_xattr = 1;
2993 if (options.lazy_loading_overridden)
2994 param->disable_lazy_load = !options.lazy_loading_enabled;
2996 param->defered_dir_update = 1;
2998 if (options.tags_ecc_overridden)
2999 param->no_tags_ecc = !options.tags_ecc_on;
3001 param->empty_lost_n_found = 1;
3002 param->refresh_period = 500;
3003 param->disable_summary = options.disable_summary;
3006 #ifdef CONFIG_YAFFS_DISABLE_BAD_BLOCK_MARKING
3007 param->disable_bad_block_marking = 1;
3009 if (options.empty_lost_and_found_overridden)
3010 param->empty_lost_n_found = options.empty_lost_and_found;
3012 /* ... and the functions. */
3013 if (yaffs_version == 2) {
3014 param->is_yaffs2 = 1;
3015 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
3016 param->total_bytes_per_chunk = mtd->writesize;
3017 param->chunks_per_block = mtd->erasesize / mtd->writesize;
3019 param->total_bytes_per_chunk = mtd->oobblock;
3020 param->chunks_per_block = mtd->erasesize / mtd->oobblock;
3022 n_blocks = YCALCBLOCKS(mtd->size, mtd->erasesize);
3024 param->start_block = 0;
3025 param->end_block = n_blocks - 1;
3027 param->is_yaffs2 = 0;
3028 n_blocks = YCALCBLOCKS(mtd->size,
3029 YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
3031 param->chunks_per_block = YAFFS_CHUNKS_PER_BLOCK;
3032 param->total_bytes_per_chunk = YAFFS_BYTES_PER_CHUNK;
3035 param->start_block = 0;
3036 param->end_block = n_blocks - 1;
3038 yaffs_mtd_drv_install(dev);
3040 param->sb_dirty_fn = yaffs_set_super_dirty;
3041 param->gc_control_fn = yaffs_gc_control_callback;
3043 yaffs_dev_to_lc(dev)->super = sb;
3045 param->use_nand_ecc = 1;
3047 param->skip_checkpt_rd = options.skip_checkpoint_read;
3048 param->skip_checkpt_wr = options.skip_checkpoint_write;
3050 mutex_lock(&yaffs_context_lock);
3051 /* Get a mount id */
3053 for (mount_id = 0; !found; mount_id++) {
3055 list_for_each(l, &yaffs_context_list) {
3057 list_entry(l, struct yaffs_linux_context,
3059 if (context_iterator->mount_id == mount_id)
3063 context->mount_id = mount_id;
3065 list_add_tail(&(yaffs_dev_to_lc(dev)->context_list),
3066 &yaffs_context_list);
3067 mutex_unlock(&yaffs_context_lock);
3069 /* Directory search handling... */
3070 INIT_LIST_HEAD(&(yaffs_dev_to_lc(dev)->search_contexts));
3071 param->remove_obj_fn = yaffs_remove_obj_callback;
3073 mutex_init(&(yaffs_dev_to_lc(dev)->gross_lock));
3075 yaffs_gross_lock(dev);
3077 err = yaffs_guts_initialise(dev);
3079 yaffs_trace(YAFFS_TRACE_OS,
3080 "yaffs_read_super: guts initialised %s",
3081 (err == YAFFS_OK) ? "OK" : "FAILED");
3083 if (err == YAFFS_OK)
3084 yaffs_bg_start(dev);
3086 if (!context->bg_thread)
3087 param->defered_dir_update = 0;
3089 sb->s_maxbytes = yaffs_max_file_size(dev);
3091 /* Release lock before yaffs_get_inode() */
3092 yaffs_gross_unlock(dev);
3094 /* Create root inode */
3095 if (err == YAFFS_OK)
3096 inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0, yaffs_root(dev));
3101 inode->i_op = &yaffs_dir_inode_operations;
3102 inode->i_fop = &yaffs_dir_operations;
3104 yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: got root inode");
3106 root = yaffs_make_root(inode);
3112 if(!dev->is_checkpointed)
3113 yaffs_set_super_dirty(dev);
3115 yaffs_trace(YAFFS_TRACE_ALWAYS,
3116 "yaffs_read_super: is_checkpointed %d",
3117 dev->is_checkpointed);
3119 yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: done");
3123 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
3124 static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
3127 return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
3130 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39))
3131 static struct dentry *yaffs_mount(struct file_system_type *fs_type, int flags,
3132 const char *dev_name, void *data)
3134 return mount_bdev(fs_type, flags, dev_name, data, yaffs_internal_read_super_mtd);
3136 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
3137 static int yaffs_read_super(struct file_system_type *fs,
3138 int flags, const char *dev_name,
3139 void *data, struct vfsmount *mnt)
3142 return get_sb_bdev(fs, flags, dev_name, data,
3143 yaffs_internal_read_super_mtd, mnt);
3146 static struct super_block *yaffs_read_super(struct file_system_type *fs,
3147 int flags, const char *dev_name,
3151 return get_sb_bdev(fs, flags, dev_name, data,
3152 yaffs_internal_read_super_mtd);
3156 static struct file_system_type yaffs_fs_type = {
3157 .owner = THIS_MODULE,
3159 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39))
3160 .mount = yaffs_mount,
3162 .get_sb = yaffs_read_super,
3164 .kill_sb = kill_block_super,
3165 .fs_flags = FS_REQUIRES_DEV,
3168 static struct super_block *yaffs_read_super(struct super_block *sb, void *data,
3171 return yaffs_internal_read_super(1, sb, data, silent);
3174 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super,
3179 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
3180 static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
3183 return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
3186 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39))
3187 static struct dentry *yaffs2_mount(struct file_system_type *fs_type, int flags,
3188 const char *dev_name, void *data)
3190 return mount_bdev(fs_type, flags, dev_name, data, yaffs2_internal_read_super_mtd);
3192 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
3193 static int yaffs2_read_super(struct file_system_type *fs,
3194 int flags, const char *dev_name, void *data,
3195 struct vfsmount *mnt)
3197 return get_sb_bdev(fs, flags, dev_name, data,
3198 yaffs2_internal_read_super_mtd, mnt);
3201 static struct super_block *yaffs2_read_super(struct file_system_type *fs,
3202 int flags, const char *dev_name,
3206 return get_sb_bdev(fs, flags, dev_name, data,
3207 yaffs2_internal_read_super_mtd);
3211 static struct file_system_type yaffs2_fs_type = {
3212 .owner = THIS_MODULE,
3214 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39))
3215 .mount = yaffs2_mount,
3217 .get_sb = yaffs2_read_super,
3219 .kill_sb = kill_block_super,
3220 .fs_flags = FS_REQUIRES_DEV,
3223 static struct super_block *yaffs2_read_super(struct super_block *sb,
3224 void *data, int silent)
3226 return yaffs_internal_read_super(2, sb, data, silent);
3229 static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super,
3234 static struct proc_dir_entry *my_proc_entry;
3236 static char *yaffs_dump_dev_part0(char *buf, struct yaffs_dev *dev)
3238 struct yaffs_param *param = &dev->param;
3241 yaffs_count_blocks_by_state(dev,bs);
3243 buf += sprintf(buf, "start_block.......... %d\n", param->start_block);
3244 buf += sprintf(buf, "end_block............ %d\n", param->end_block);
3245 buf += sprintf(buf, "total_bytes_per_chunk %d\n",
3246 param->total_bytes_per_chunk);
3247 buf += sprintf(buf, "use_nand_ecc......... %d\n", param->use_nand_ecc);
3248 buf += sprintf(buf, "no_tags_ecc.......... %d\n", param->no_tags_ecc);
3249 buf += sprintf(buf, "is_yaffs2............ %d\n", param->is_yaffs2);
3250 buf += sprintf(buf, "inband_tags.......... %d\n", param->inband_tags);
3251 buf += sprintf(buf, "empty_lost_n_found... %d\n",
3252 param->empty_lost_n_found);
3253 buf += sprintf(buf, "disable_lazy_load.... %d\n",
3254 param->disable_lazy_load);
3255 buf += sprintf(buf, "disable_bad_block_mrk %d\n",
3256 param->disable_bad_block_marking);
3257 buf += sprintf(buf, "refresh_period....... %d\n",
3258 param->refresh_period);
3259 buf += sprintf(buf, "n_caches............. %d\n", param->n_caches);
3260 buf += sprintf(buf, "n_reserved_blocks.... %d\n",
3261 param->n_reserved_blocks);
3262 buf += sprintf(buf, "always_check_erased.. %d\n",
3263 param->always_check_erased);
3264 buf += sprintf(buf, "\n");
3265 buf += sprintf(buf, "block count by state\n");
3266 buf += sprintf(buf, "0:%d 1:%d 2:%d 3:%d 4:%d\n",
3267 bs[0], bs[1], bs[2], bs[3], bs[4]);
3268 buf += sprintf(buf, "5:%d 6:%d 7:%d 8:%d 9:%d\n",
3269 bs[5], bs[6], bs[7], bs[8], bs[9]);
3274 static char *yaffs_dump_dev_part1(char *buf, struct yaffs_dev *dev)
3276 buf += sprintf(buf, "max file size....... %lld\n",
3277 (long long) yaffs_max_file_size(dev));
3278 buf += sprintf(buf, "data_bytes_per_chunk. %d\n",
3279 dev->data_bytes_per_chunk);
3280 buf += sprintf(buf, "chunk_grp_bits....... %d\n", dev->chunk_grp_bits);
3281 buf += sprintf(buf, "chunk_grp_size....... %d\n", dev->chunk_grp_size);
3282 buf += sprintf(buf, "n_erased_blocks...... %d\n", dev->n_erased_blocks);
3283 buf += sprintf(buf, "blocks_in_checkpt.... %d\n",
3284 dev->blocks_in_checkpt);
3285 buf += sprintf(buf, "\n");
3286 buf += sprintf(buf, "n_tnodes............. %d\n", dev->n_tnodes);
3287 buf += sprintf(buf, "n_obj................ %d\n", dev->n_obj);
3288 buf += sprintf(buf, "n_free_chunks........ %d\n", dev->n_free_chunks);
3289 buf += sprintf(buf, "\n");
3290 buf += sprintf(buf, "n_page_writes........ %u\n", dev->n_page_writes);
3291 buf += sprintf(buf, "n_page_reads......... %u\n", dev->n_page_reads);
3292 buf += sprintf(buf, "n_erasures........... %u\n", dev->n_erasures);
3293 buf += sprintf(buf, "n_gc_copies.......... %u\n", dev->n_gc_copies);
3294 buf += sprintf(buf, "all_gcs.............. %u\n", dev->all_gcs);
3295 buf += sprintf(buf, "passive_gc_count..... %u\n",
3296 dev->passive_gc_count);
3297 buf += sprintf(buf, "oldest_dirty_gc_count %u\n",
3298 dev->oldest_dirty_gc_count);
3299 buf += sprintf(buf, "n_gc_blocks.......... %u\n", dev->n_gc_blocks);
3300 buf += sprintf(buf, "bg_gcs............... %u\n", dev->bg_gcs);
3301 buf += sprintf(buf, "n_retried_writes..... %u\n",
3302 dev->n_retried_writes);
3303 buf += sprintf(buf, "n_retired_blocks..... %u\n",
3304 dev->n_retired_blocks);
3305 buf += sprintf(buf, "n_ecc_fixed.......... %u\n", dev->n_ecc_fixed);
3306 buf += sprintf(buf, "n_ecc_unfixed........ %u\n", dev->n_ecc_unfixed);
3307 buf += sprintf(buf, "n_tags_ecc_fixed..... %u\n",
3308 dev->n_tags_ecc_fixed);
3309 buf += sprintf(buf, "n_tags_ecc_unfixed... %u\n",
3310 dev->n_tags_ecc_unfixed);
3311 buf += sprintf(buf, "cache_hits........... %u\n", dev->cache_hits);
3312 buf += sprintf(buf, "n_deleted_files...... %u\n", dev->n_deleted_files);
3313 buf += sprintf(buf, "n_unlinked_files..... %u\n",
3314 dev->n_unlinked_files);
3315 buf += sprintf(buf, "refresh_count........ %u\n", dev->refresh_count);
3316 buf += sprintf(buf, "n_bg_deletions....... %u\n", dev->n_bg_deletions);
3317 buf += sprintf(buf, "tags_used............ %u\n", dev->tags_used);
3318 buf += sprintf(buf, "summary_used......... %u\n", dev->summary_used);
3323 static int yaffs_proc_read(char *page,
3325 off_t offset, int count, int *eof, void *data)
3327 struct list_head *item;
3332 /* Get proc_file_read() to step 'offset' by one on each sucessive call.
3333 * We use 'offset' (*ppos) to indicate where we are in dev_list.
3334 * This also assumes the user has posted a read buffer large
3335 * enough to hold the complete output; but that's life in /proc.
3340 /* Print header first */
3343 sprintf(buf, "Multi-version YAFFS\n");
3345 buf += sprintf(buf, "\n");
3349 mutex_lock(&yaffs_context_lock);
3351 /* Locate and print the Nth entry. Order N-squared but N is small. */
3352 list_for_each(item, &yaffs_context_list) {
3353 struct yaffs_linux_context *dc =
3354 list_entry(item, struct yaffs_linux_context,
3356 struct yaffs_dev *dev = dc->dev;
3358 if (n < (step & ~1)) {
3362 if ((step & 1) == 0) {
3364 sprintf(buf, "\nDevice %d \"%s\"\n", n,
3366 buf = yaffs_dump_dev_part0(buf, dev);
3368 buf = yaffs_dump_dev_part1(buf, dev);
3373 mutex_unlock(&yaffs_context_lock);
3376 return buf - page < count ? buf - page : count;
3380 * Set the verbosity of the warnings and error messages.
3382 * Note that the names can only be a..z or _ with the current code.
3387 unsigned mask_bitfield;
3389 {"allocate", YAFFS_TRACE_ALLOCATE},
3390 {"always", YAFFS_TRACE_ALWAYS},
3391 {"background", YAFFS_TRACE_BACKGROUND},
3392 {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
3393 {"buffers", YAFFS_TRACE_BUFFERS},
3394 {"bug", YAFFS_TRACE_BUG},
3395 {"checkpt", YAFFS_TRACE_CHECKPOINT},
3396 {"deletion", YAFFS_TRACE_DELETION},
3397 {"erase", YAFFS_TRACE_ERASE},
3398 {"error", YAFFS_TRACE_ERROR},
3399 {"gc_detail", YAFFS_TRACE_GC_DETAIL},
3400 {"gc", YAFFS_TRACE_GC},
3401 {"lock", YAFFS_TRACE_LOCK},
3402 {"mtd", YAFFS_TRACE_MTD},
3403 {"nandaccess", YAFFS_TRACE_NANDACCESS},
3404 {"os", YAFFS_TRACE_OS},
3405 {"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
3406 {"scan", YAFFS_TRACE_SCAN},
3407 {"mount", YAFFS_TRACE_MOUNT},
3408 {"tracing", YAFFS_TRACE_TRACING},
3409 {"sync", YAFFS_TRACE_SYNC},
3410 {"write", YAFFS_TRACE_WRITE},
3411 {"verify", YAFFS_TRACE_VERIFY},
3412 {"verify_nand", YAFFS_TRACE_VERIFY_NAND},
3413 {"verify_full", YAFFS_TRACE_VERIFY_FULL},
3414 {"verify_all", YAFFS_TRACE_VERIFY_ALL},
3415 {"all", 0xffffffff},
3420 #define MAX_MASK_NAME_LENGTH 40
3421 static int yaffs_proc_write_trace_options(struct file *file, const char *buf,
3422 unsigned long count)
3424 unsigned rg = 0, mask_bitfield;
3428 char substring[MAX_MASK_NAME_LENGTH + 1];
3434 rg = yaffs_trace_mask;
3436 while (!done && (pos < count)) {
3438 while ((pos < count) && isspace(buf[pos]))
3455 mask_bitfield = simple_strtoul(buf + pos, &end, 0);
3457 if (end > buf + pos) {
3458 mask_name = "numeral";
3459 len = end - (buf + pos);
3463 for (x = buf + pos, i = 0;
3464 (*x == '_' || (*x >= 'a' && *x <= 'z')) &&
3465 i < MAX_MASK_NAME_LENGTH; x++, i++, pos++)
3467 substring[i] = '\0';
3469 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
3470 if (strcmp(substring, mask_flags[i].mask_name)
3472 mask_name = mask_flags[i].mask_name;
3474 mask_flags[i].mask_bitfield;
3481 if (mask_name != NULL) {
3485 rg &= ~mask_bitfield;
3488 rg |= mask_bitfield;
3494 rg |= mask_bitfield;
3500 yaffs_trace_mask = rg | YAFFS_TRACE_ALWAYS;
3502 printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_trace_mask);
3504 if (rg & YAFFS_TRACE_ALWAYS) {
3505 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
3507 flag = ((rg & mask_flags[i].mask_bitfield) ==
3508 mask_flags[i].mask_bitfield) ? '+' : '-';
3509 printk(KERN_DEBUG "%c%s\n", flag,
3510 mask_flags[i].mask_name);
3517 /* Debug strings are of the form:
3518 * .bnnn print info on block n
3519 * .cobjn,chunkn print nand chunk id for objn:chunkn
3522 static int yaffs_proc_debug_write(struct file *file, const char *buf,
3523 unsigned long count)
3532 struct list_head *item;
3534 memset(str, 0, sizeof(str));
3535 memcpy(str, buf, min((size_t)count, sizeof(str) -1));
3543 while (*p1 && *p1 != ',') {
3549 p0_val = simple_strtol(p0, NULL, 0);
3550 p1_val = simple_strtol(p1, NULL, 0);
3553 mutex_lock(&yaffs_context_lock);
3555 /* Locate and print the Nth entry. Order N-squared but N is small. */
3556 list_for_each(item, &yaffs_context_list) {
3557 struct yaffs_linux_context *dc =
3558 list_entry(item, struct yaffs_linux_context,
3560 struct yaffs_dev *dev = dc->dev;
3563 struct yaffs_block_info *bi;
3565 bi = yaffs_get_block_info(dev,p0_val);
3568 printk("Block %d: state %d, retire %d, use %d, seq %d\n",
3569 (int)p0_val, bi->block_state,
3570 bi->needs_retiring, bi->pages_in_use,
3573 } else if (cmd == 'c') {
3574 struct yaffs_obj *obj;
3577 obj = yaffs_find_by_number(dev, p0_val);
3579 printk("No obj %d\n", (int)p0_val);
3582 nand_chunk = obj->hdr_chunk;
3585 yaffs_find_chunk_in_file(obj,
3587 printk("Nand chunk for %d:%d is %d\n",
3588 (int)p0_val, (int)p1_val, nand_chunk);
3593 mutex_unlock(&yaffs_context_lock);
3599 #if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 14, 0))
3600 static int yaffs_proc_write(struct file *file, const char *buf,
3601 unsigned long count, void *ppos)
3603 static ssize_t yaffs_proc_write(struct file *file, const char __user *buf,
3604 size_t count, loff_t *ppos)
3608 return yaffs_proc_debug_write(file, buf, count);
3609 return yaffs_proc_write_trace_options(file, buf, count);
3612 /* Stuff to handle installation of file systems */
3613 struct file_system_to_install {
3614 struct file_system_type *fst;
3618 static struct file_system_to_install fs_to_install[] = {
3619 {&yaffs_fs_type, 0},
3620 {&yaffs2_fs_type, 0},
3625 #ifdef YAFFS_NEW_PROCFS
3626 static int yaffs_proc_show(struct seq_file *m, void *v)
3628 /* FIXME: Unify in a better way? */
3633 len = yaffs_proc_read(buffer, &start, 0, sizeof(buffer), NULL, NULL);
3634 seq_puts(m, buffer);
3638 static int yaffs_proc_open(struct inode *inode, struct file *file)
3640 return single_open(file, yaffs_proc_show, NULL);
3643 static struct file_operations procfs_ops = {
3644 .owner = THIS_MODULE,
3645 .open = yaffs_proc_open,
3647 .write = yaffs_proc_write,
3650 static int yaffs_procfs_init(void)
3652 /* Install the proc_fs entries */
3653 my_proc_entry = proc_create("yaffs",
3658 if (my_proc_entry) {
3668 static int yaffs_procfs_init(void)
3670 /* Install the proc_fs entries */
3671 my_proc_entry = create_proc_entry("yaffs",
3672 S_IRUGO | S_IFREG, YPROC_ROOT);
3674 if (my_proc_entry) {
3675 my_proc_entry->write_proc = yaffs_proc_write;
3676 my_proc_entry->read_proc = yaffs_proc_read;
3677 my_proc_entry->data = NULL;
3687 static int __init init_yaffs_fs(void)
3690 struct file_system_to_install *fsinst;
3692 yaffs_trace(YAFFS_TRACE_ALWAYS,
3693 "yaffs Installing.");
3695 mutex_init(&yaffs_context_lock);
3697 error = yaffs_procfs_init();
3701 /* Now add the file system entries */
3703 fsinst = fs_to_install;
3705 while (fsinst->fst && !error) {
3706 error = register_filesystem(fsinst->fst);
3708 fsinst->installed = 1;
3712 /* Any errors? uninstall */
3714 fsinst = fs_to_install;
3716 while (fsinst->fst) {
3717 if (fsinst->installed) {
3718 unregister_filesystem(fsinst->fst);
3719 fsinst->installed = 0;
3728 static void __exit exit_yaffs_fs(void)
3731 struct file_system_to_install *fsinst;
3733 yaffs_trace(YAFFS_TRACE_ALWAYS,
3736 remove_proc_entry("yaffs", YPROC_ROOT);
3738 fsinst = fs_to_install;
3740 while (fsinst->fst) {
3741 if (fsinst->installed) {
3742 unregister_filesystem(fsinst->fst);
3743 fsinst->installed = 0;
3749 module_init(init_yaffs_fs)
3750 module_exit(exit_yaffs_fs)
3752 MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
3753 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2011");
3754 MODULE_LICENSE("GPL");