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    Subject[PATCH 25/29] Staging: yaffs2: yaffs_vfs_glue.c: Add file
    Date
    Adding files to yaffs2 directory.

    Signed-off-by: Tracey Dent <tdent48227@gmail.com>
    ---
    drivers/staging/yaffs2/yaffs_vfs_glue.c | 3019 +++++++++++++++++++++++++++++++
    1 files changed, 3019 insertions(+), 0 deletions(-)
    create mode 100644 drivers/staging/yaffs2/yaffs_vfs_glue.c

    diff --git a/drivers/staging/yaffs2/yaffs_vfs_glue.c b/drivers/staging/yaffs2/yaffs_vfs_glue.c
    new file mode 100644
    index 0000000..b1b6840
    --- /dev/null
    +++ b/drivers/staging/yaffs2/yaffs_vfs_glue.c
    @@ -0,0 +1,3019 @@
    +/*
    + * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
    + *
    + * Copyright (C) 2002-2010 Aleph One Ltd.
    + * for Toby Churchill Ltd and Brightstar Engineering
    + *
    + * Created by Charles Manning <charles@aleph1.co.uk>
    + * Acknowledgements:
    + * Luc van OostenRyck for numerous patches.
    + * Nick Bane for numerous patches.
    + * Nick Bane for 2.5/2.6 integration.
    + * Andras Toth for mknod rdev issue.
    + * Michael Fischer for finding the problem with inode inconsistency.
    + * Some code bodily lifted from JFFS
    + *
    + * This program is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License version 2 as
    + * published by the Free Software Foundation.
    + */
    +
    +/*
    + *
    + * This is the file system front-end to YAFFS that hooks it up to
    + * the VFS.
    + *
    + * Special notes:
    + * >> 2.4: sb->u.generic_sbp points to the yaffs_dev_t associated with
    + * this superblock
    + * >> 2.6: sb->s_fs_info points to the yaffs_dev_t associated with this
    + * superblock
    + * >> inode->u.generic_ip points to the associated yaffs_obj_t.
    + */
    +
    +/*
    + * NB There are two variants of Linux VFS glue code. This variant supports
    + * a single version and should not include any multi-version code.
    + */
    +#include <linux/version.h>
    +
    +#include <linux/kernel.h>
    +#include <linux/module.h>
    +#include <linux/slab.h>
    +#include <linux/init.h>
    +#include <linux/fs.h>
    +#include <linux/proc_fs.h>
    +#include <linux/smp_lock.h>
    +#include <linux/pagemap.h>
    +#include <linux/mtd/mtd.h>
    +#include <linux/interrupt.h>
    +#include <linux/string.h>
    +#include <linux/ctype.h>
    +#include <linux/namei.h>
    +#include <linux/exportfs.h>
    +#include <linux/kthread.h>
    +#include <linux/delay.h>
    +#include <linux/freezer.h>
    +
    +#include <asm/div64.h>
    +
    +
    +#include <linux/statfs.h>
    +
    +#define UnlockPage(p) unlock_page(p)
    +#define Page_Uptodate(page) test_bit(PG_uptodate, &(page)->flags)
    +
    +#define yaffs_devname(sb, buf) bdevname(sb->s_bdev, buf)
    +
    +#define YPROC_ROOT NULL
    +
    +#define Y_INIT_TIMER(a) init_timer_on_stack(a)
    +
    +#define WRITE_SIZE_STR "writesize"
    +#define WRITE_SIZE(mtd) ((mtd)->writesize)
    +
    +
    +static uint32_t YCALCBLOCKS(uint64_t partition_size, uint32_t block_size)
    +{
    + uint64_t result = partition_size;
    + do_div(result, block_size);
    + return (uint32_t)result;
    +}
    +
    +#include <linux/uaccess.h>
    +#include <linux/mtd/mtd.h>
    +
    +#include "yportenv.h"
    +#include "yaffs_trace.h"
    +#include "yaffs_guts.h"
    +
    +#include "yaffs_linux.h"
    +
    +#include "yaffs_mtdif.h"
    +#include "yaffs_mtdif1.h"
    +#include "yaffs_mtdif2.h"
    +
    +unsigned int yaffs_trace_mask = YAFFS_TRACE_BAD_BLOCKS | YAFFS_TRACE_ALWAYS;
    +unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS;
    +unsigned int yaffs_auto_checkpoint = 1;
    +unsigned int yaffs_gc_control = 1;
    +unsigned int yaffs_bg_enable = 1;
    +
    +/* Module Parameters */
    +module_param(yaffs_trace_mask, uint, 0644);
    +module_param(yaffs_wr_attempts, uint, 0644);
    +module_param(yaffs_auto_checkpoint, uint, 0644);
    +module_param(yaffs_gc_control, uint, 0644);
    +module_param(yaffs_bg_enable, uint, 0644);
    +
    +#define Y_IGET(sb, inum) yaffs_iget((sb), (inum))
    +
    +static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino);
    +
    +#define yaffs_inode_to_obj_lv(iptr) ((iptr)->i_private)
    +#define yaffs_inode_to_obj(iptr) ((yaffs_obj_t *)(yaffs_inode_to_obj_lv(iptr)))
    +#define yaffs_dentry_to_obj(dptr) yaffs_inode_to_obj((dptr)->d_inode)
    +#define yaffs_super_to_dev(sb) ((yaffs_dev_t *)sb->s_fs_info)
    +
    +
    +#define update_dir_time(dir) do {\
    + (dir)->i_ctime = (dir)->i_mtime = CURRENT_TIME; \
    + } while(0)
    +
    +static void yaffs_put_super(struct super_block *sb);
    +
    +static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
    + loff_t *pos);
    +static ssize_t yaffs_hold_space(struct file *f);
    +static void yaffs_release_space(struct file *f);
    +
    +static int yaffs_file_flush(struct file *file, fl_owner_t id);
    +
    +static int yaffs_sync_object(struct file *file, int datasync);
    +
    +static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
    +
    +static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
    + struct nameidata *n);
    +static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
    + struct nameidata *n);
    +static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
    + struct dentry *dentry);
    +static int yaffs_unlink(struct inode *dir, struct dentry *dentry);
    +static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
    + const char *symname);
    +static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
    +
    +static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
    + dev_t dev);
    +static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
    + struct inode *new_dir, struct dentry *new_dentry);
    +static int yaffs_setattr(struct dentry *dentry, struct iattr *attr);
    +
    +static int yaffs_sync_fs(struct super_block *sb, int wait);
    +static void yaffs_write_super(struct super_block *sb);
    +
    +static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf);
    +
    +#ifdef YAFFS_HAS_PUT_INODE
    +static void yaffs_put_inode(struct inode *inode);
    +#endif
    +
    +static void yaffs_evict_inode(struct inode *);
    +
    +static int yaffs_readpage(struct file *file, struct page *page);
    +static int yaffs_writepage(struct page *page, struct writeback_control *wbc);
    +
    +#ifdef CONFIG_YAFFS_XATTR
    +int yaffs_setxattr(struct dentry *dentry, const char *name,
    + const void *value, size_t size, int flags);
    +ssize_t yaffs_getxattr(struct dentry *dentry, const char *name, void *buff,
    + size_t size);
    +int yaffs_removexattr(struct dentry *dentry, const char *name);
    +ssize_t yaffs_listxattr(struct dentry *dentry, char *buff, size_t size);
    +#endif
    +
    +
    +static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
    + loff_t pos, unsigned len, unsigned flags,
    + struct page **pagep, void **fsdata);
    +static int yaffs_write_end(struct file *filp, struct address_space *mapping,
    + loff_t pos, unsigned len, unsigned copied,
    + struct page *pg, void *fsdadata);
    +
    +static int yaffs_readlink(struct dentry *dentry, char __user *buffer,
    + int buflen);
    +void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias);
    +static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
    +
    +static void yaffs_touch_super(yaffs_dev_t *dev);
    +
    +static loff_t yaffs_dir_llseek(struct file *file, loff_t offset, int origin);
    +
    +static int yaffs_vfs_setattr(struct inode *, struct iattr *);
    +
    +
    +static struct address_space_operations yaffs_file_address_operations = {
    + .readpage = yaffs_readpage,
    + .writepage = yaffs_writepage,
    + .write_begin = yaffs_write_begin,
    + .write_end = yaffs_write_end,
    +};
    +
    +
    +static const struct file_operations yaffs_file_operations = {
    + .read = do_sync_read,
    + .write = do_sync_write,
    + .aio_read = generic_file_aio_read,
    + .aio_write = generic_file_aio_write,
    + .mmap = generic_file_mmap,
    + .flush = yaffs_file_flush,
    + .fsync = yaffs_sync_object,
    + .splice_read = generic_file_splice_read,
    + .splice_write = generic_file_splice_write,
    + .llseek = generic_file_llseek,
    +};
    +
    +
    +
    +static const struct inode_operations yaffs_file_inode_operations = {
    + .setattr = yaffs_setattr,
    +#ifdef CONFIG_YAFFS_XATTR
    + .setxattr = yaffs_setxattr,
    + .getxattr = yaffs_getxattr,
    + .listxattr = yaffs_listxattr,
    + .removexattr = yaffs_removexattr,
    +#endif
    +};
    +
    +static const struct inode_operations yaffs_symlink_inode_operations = {
    + .readlink = yaffs_readlink,
    + .follow_link = yaffs_follow_link,
    + .put_link = yaffs_put_link,
    + .setattr = yaffs_setattr,
    +#ifdef CONFIG_YAFFS_XATTR
    + .setxattr = yaffs_setxattr,
    + .getxattr = yaffs_getxattr,
    + .listxattr = yaffs_listxattr,
    + .removexattr = yaffs_removexattr,
    +#endif
    +};
    +
    +static const struct inode_operations yaffs_dir_inode_operations = {
    + .create = yaffs_create,
    + .lookup = yaffs_lookup,
    + .link = yaffs_link,
    + .unlink = yaffs_unlink,
    + .symlink = yaffs_symlink,
    + .mkdir = yaffs_mkdir,
    + .rmdir = yaffs_unlink,
    + .mknod = yaffs_mknod,
    + .rename = yaffs_rename,
    + .setattr = yaffs_setattr,
    +#ifdef CONFIG_YAFFS_XATTR
    + .setxattr = yaffs_setxattr,
    + .getxattr = yaffs_getxattr,
    + .listxattr = yaffs_listxattr,
    + .removexattr = yaffs_removexattr,
    +#endif
    +};
    +
    +static const struct file_operations yaffs_dir_operations = {
    + .read = generic_read_dir,
    + .readdir = yaffs_readdir,
    + .fsync = yaffs_sync_object,
    + .llseek = yaffs_dir_llseek,
    +};
    +
    +static const struct super_operations yaffs_super_ops = {
    + .statfs = yaffs_statfs,
    +#ifdef YAFFS_HAS_PUT_INODE
    + .put_inode = yaffs_put_inode,
    +#endif
    + .put_super = yaffs_put_super,
    + .evict_inode = yaffs_evict_inode,
    + .sync_fs = yaffs_sync_fs,
    + .write_super = yaffs_write_super,
    +};
    +
    +
    +static int yaffs_vfs_setattr(struct inode *inode, struct iattr *attr)
    +{
    + setattr_copy(inode,attr);
    + return 0;
    +}
    +
    +static int yaffs_vfs_setsize(struct inode *inode, loff_t newsize)
    +{
    + truncate_setsize(inode,newsize);
    + return 0;
    +}
    +
    +static unsigned yaffs_gc_control_callback(yaffs_dev_t *dev)
    +{
    + return yaffs_gc_control;
    +}
    +
    +static void yaffs_gross_lock(yaffs_dev_t *dev)
    +{
    + T(YAFFS_TRACE_LOCK, (TSTR("yaffs locking %p\n"), current));
    + down(&(yaffs_dev_to_lc(dev)->gross_lock));
    + T(YAFFS_TRACE_LOCK, (TSTR("yaffs locked %p\n"), current));
    +}
    +
    +static void yaffs_gross_unlock(yaffs_dev_t *dev)
    +{
    + T(YAFFS_TRACE_LOCK, (TSTR("yaffs unlocking %p\n"), current));
    + up(&(yaffs_dev_to_lc(dev)->gross_lock));
    +}
    +
    +
    +
    +/* ExportFS support */
    +static struct inode *
    +yaffs2_nfs_get_inode(struct super_block *sb, uint64_t ino, uint32_t generation)
    +{
    + return Y_IGET(sb, ino);
    +}
    +
    +static struct dentry *
    +yaffs2_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len, int fh_type)
    +{
    + return generic_fh_to_dentry(sb, fid, fh_len, fh_type, yaffs2_nfs_get_inode) ;
    +}
    +
    +static struct dentry *
    + yaffs2_fh_to_parent(struct super_block *sb, struct fid *fid, int fh_len, int fh_type)
    +{
    + return generic_fh_to_parent(sb, fid, fh_len, fh_type, yaffs2_nfs_get_inode);
    +}
    +
    +struct dentry *yaffs2_get_parent(struct dentry *dentry)
    +{
    +
    + struct super_block *sb = dentry->d_inode->i_sb;
    + struct dentry *parent = ERR_PTR(-ENOENT);
    + struct inode *inode;
    + unsigned long parent_ino;
    + yaffs_obj_t *d_obj;
    + yaffs_obj_t *parent_obj;
    +
    + d_obj = yaffs_inode_to_obj(dentry->d_inode);
    +
    + if (d_obj) {
    + parent_obj = d_obj->parent;
    + if (parent_obj) {
    + parent_ino = yaffs_get_obj_inode(parent_obj);
    + inode = Y_IGET(sb, parent_ino);
    +
    + if (IS_ERR(inode)) {
    + parent = ERR_CAST(inode);
    + } else {
    + parent = d_obtain_alias(inode);
    + if (!IS_ERR(parent)) {
    + parent = ERR_PTR(-ENOMEM);
    + iput(inode);
    + }
    + }
    + }
    + }
    +
    + return parent;
    +}
    +
    +/* Just declare a zero structure as a NULL value implies
    + * using the default functions of exportfs.
    + */
    +
    +static struct export_operations yaffs_export_ops =
    +{
    + .fh_to_dentry = yaffs2_fh_to_dentry,
    + .fh_to_parent = yaffs2_fh_to_parent,
    + .get_parent = yaffs2_get_parent,
    +} ;
    +
    +/*-----------------------------------------------------------------*/
    +/* Directory search context allows us to unlock access to yaffs during
    + * filldir without causing problems with the directory being modified.
    + * This is similar to the tried and tested mechanism used in yaffs direct.
    + *
    + * A search context iterates along a doubly linked list of siblings in the
    + * directory. If the iterating object is deleted then this would corrupt
    + * the list iteration, likely causing a crash. The search context avoids
    + * this by using the remove_obj_fn to move the search context to the
    + * next object before the object is deleted.
    + *
    + * Many readdirs (and thus seach conexts) may be alive simulateously so
    + * each yaffs_dev_t has a list of these.
    + *
    + * A seach context lives for the duration of a readdir.
    + *
    + * All these functions must be called while yaffs is locked.
    + */
    +
    +struct yaffs_search_context {
    + yaffs_dev_t *dev;
    + yaffs_obj_t *dir_obj;
    + yaffs_obj_t *next_return;
    + struct ylist_head others;
    +};
    +
    +/*
    + * yaffs_new_search() creates a new search context, initialises it and
    + * adds it to the device's search context list.
    + *
    + * Called at start of readdir.
    + */
    +static struct yaffs_search_context * yaffs_new_search(yaffs_obj_t *dir)
    +{
    + yaffs_dev_t *dev = dir->my_dev;
    + struct yaffs_search_context *sc = YMALLOC(sizeof(struct yaffs_search_context));
    + if(sc){
    + sc->dir_obj = dir;
    + sc->dev = dev;
    + if( ylist_empty(&sc->dir_obj->variant.dir_variant.children))
    + sc->next_return = NULL;
    + else
    + sc->next_return = ylist_entry(
    + dir->variant.dir_variant.children.next,
    + yaffs_obj_t,siblings);
    + YINIT_LIST_HEAD(&sc->others);
    + ylist_add(&sc->others,&(yaffs_dev_to_lc(dev)->search_contexts));
    + }
    + return sc;
    +}
    +
    +/*
    + * yaffs_search_end() disposes of a search context and cleans up.
    + */
    +static void yaffs_search_end(struct yaffs_search_context * sc)
    +{
    + if(sc){
    + ylist_del(&sc->others);
    + YFREE(sc);
    + }
    +}
    +
    +/*
    + * yaffs_search_advance() moves a search context to the next object.
    + * Called when the search iterates or when an object removal causes
    + * the search context to be moved to the next object.
    + */
    +static void yaffs_search_advance(struct yaffs_search_context *sc)
    +{
    + if(!sc)
    + return;
    +
    + if( sc->next_return == NULL ||
    + ylist_empty(&sc->dir_obj->variant.dir_variant.children))
    + sc->next_return = NULL;
    + else {
    + struct ylist_head *next = sc->next_return->siblings.next;
    +
    + if( next == &sc->dir_obj->variant.dir_variant.children)
    + sc->next_return = NULL; /* end of list */
    + else
    + sc->next_return = ylist_entry(next,yaffs_obj_t,siblings);
    + }
    +}
    +
    +/*
    + * yaffs_remove_obj_callback() is called when an object is unlinked.
    + * We check open search contexts and advance any which are currently
    + * on the object being iterated.
    + */
    +static void yaffs_remove_obj_callback(yaffs_obj_t *obj)
    +{
    +
    + struct ylist_head *i;
    + struct yaffs_search_context *sc;
    + struct ylist_head *search_contexts = &(yaffs_dev_to_lc(obj->my_dev)->search_contexts);
    +
    +
    + /* Iterate through the directory search contexts.
    + * If any are currently on the object being removed, then advance
    + * the search context to the next object to prevent a hanging pointer.
    + */
    + ylist_for_each(i, search_contexts) {
    + if (i) {
    + sc = ylist_entry(i, struct yaffs_search_context,others);
    + if(sc->next_return == obj)
    + yaffs_search_advance(sc);
    + }
    + }
    +
    +}
    +
    +
    +/*-----------------------------------------------------------------*/
    +
    +static int yaffs_readlink(struct dentry *dentry, char __user *buffer,
    + int buflen)
    +{
    + unsigned char *alias;
    + int ret;
    +
    + yaffs_dev_t *dev = yaffs_dentry_to_obj(dentry)->my_dev;
    +
    + yaffs_gross_lock(dev);
    +
    + alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
    +
    + yaffs_gross_unlock(dev);
    +
    + if (!alias)
    + return -ENOMEM;
    +
    + ret = vfs_readlink(dentry, buffer, buflen, alias);
    + kfree(alias);
    + return ret;
    +}
    +
    +static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
    +{
    + unsigned char *alias;
    + void *ret;
    + yaffs_dev_t *dev = yaffs_dentry_to_obj(dentry)->my_dev;
    +
    + yaffs_gross_lock(dev);
    +
    + alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
    + yaffs_gross_unlock(dev);
    +
    + if (!alias) {
    + ret = ERR_PTR(-ENOMEM);
    + goto out;
    + }
    +
    + nd_set_link(nd, alias);
    + ret = (void *)alias;
    +out:
    + return ret;
    +}
    +
    +void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias) {
    + kfree(alias);
    +}
    +
    +struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
    + yaffs_obj_t *obj);
    +
    +/*
    + * Lookup is used to find objects in the fs
    + */
    +
    +static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
    + struct nameidata *n)
    +{
    + yaffs_obj_t *obj;
    + struct inode *inode = NULL; /* NCB 2.5/2.6 needs NULL here */
    +
    + yaffs_dev_t *dev = yaffs_inode_to_obj(dir)->my_dev;
    +
    + if(current != yaffs_dev_to_lc(dev)->readdir_process)
    + yaffs_gross_lock(dev);
    +
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_lookup for %d:%s\n"),
    + yaffs_inode_to_obj(dir)->obj_id, dentry->d_name.name));
    +
    + obj = yaffs_find_by_name(yaffs_inode_to_obj(dir),
    + dentry->d_name.name);
    +
    + obj = yaffs_get_equivalent_obj(obj); /* in case it was a hardlink */
    +
    + /* Can't hold gross lock when calling yaffs_get_inode() */
    + if(current != yaffs_dev_to_lc(dev)->readdir_process)
    + yaffs_gross_unlock(dev);
    +
    + if (obj) {
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_lookup found %d\n"), obj->obj_id));
    +
    + inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
    +
    + if (inode) {
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_loookup dentry \n")));
    +/* #if 0 asserted by NCB for 2.5/6 compatability - falls through to
    + * d_add even if NULL inode */
    +#if 0
    + /*dget(dentry); // try to solve directory bug */
    + d_add(dentry, inode);
    +
    + /* return dentry; */
    + return NULL;
    +#endif
    + }
    +
    + } else {
    + T(YAFFS_TRACE_OS,(TSTR("yaffs_lookup not found\n")));
    +
    + }
    +
    +/* added NCB for 2.5/6 compatability - forces add even if inode is
    + * NULL which creates dentry hash */
    + d_add(dentry, inode);
    +
    + return NULL;
    +}
    +
    +
    +#ifdef YAFFS_HAS_PUT_INODE
    +
    +/* For now put inode is just for debugging
    + * Put inode is called when the inode **structure** is put.
    + */
    +static void yaffs_put_inode(struct inode *inode)
    +{
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_put_inode: ino %d, count %d\n"), (int)inode->i_ino,
    + atomic_read(&inode->i_count)));
    +
    +}
    +#endif
    +
    +
    +static void yaffs_unstitch_obj(struct inode *inode, yaffs_obj_t *obj)
    +{
    + /* Clear the association between the inode and
    + * the yaffs_obj_t.
    + */
    + obj->my_inode = NULL;
    + yaffs_inode_to_obj_lv(inode) = NULL;
    +
    + /* If the object freeing was deferred, then the real
    + * free happens now.
    + * This should fix the inode inconsistency problem.
    + */
    + yaffs_handle_defered_free(obj);
    +}
    +
    +/* yaffs_evict_inode combines into one operation what was previously done in
    + * yaffs_clear_inode() and yaffs_delete_inode()
    + *
    + */
    +static void yaffs_evict_inode( struct inode *inode)
    +{
    + yaffs_obj_t *obj;
    + yaffs_dev_t *dev;
    + int deleteme = 0;
    +
    + obj = yaffs_inode_to_obj(inode);
    +
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_evict_inode: ino %d, count %d %s\n"), (int)inode->i_ino,
    + atomic_read(&inode->i_count),
    + obj ? "object exists" : "null object"));
    +
    + if (!inode->i_nlink && !is_bad_inode(inode))
    + deleteme = 1;
    + truncate_inode_pages(&inode->i_data,0);
    + end_writeback(inode);
    +
    + if(deleteme && obj){
    + dev = obj->my_dev;
    + yaffs_gross_lock(dev);
    + yaffs_del_obj(obj);
    + yaffs_gross_unlock(dev);
    + }
    + if (obj) {
    + dev = obj->my_dev;
    + yaffs_gross_lock(dev);
    + yaffs_unstitch_obj(inode,obj);
    + yaffs_gross_unlock(dev);
    + }
    +
    +
    +}
    +
    +
    +static int yaffs_file_flush(struct file *file, fl_owner_t id)
    +{
    + yaffs_obj_t *obj = yaffs_dentry_to_obj(file->f_dentry);
    +
    + yaffs_dev_t *dev = obj->my_dev;
    +
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_file_flush object %d (%s)\n"), obj->obj_id,
    + obj->dirty ? "dirty" : "clean"));
    +
    + yaffs_gross_lock(dev);
    +
    + yaffs_flush_file(obj, 1, 0);
    +
    + yaffs_gross_unlock(dev);
    +
    + return 0;
    +}
    +
    +static int yaffs_readpage_nolock(struct file *f, struct page *pg)
    +{
    + /* Lifted from jffs2 */
    +
    + yaffs_obj_t *obj;
    + unsigned char *pg_buf;
    + int ret;
    +
    + yaffs_dev_t *dev;
    +
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_readpage_nolock at %08x, size %08x\n"),
    + (unsigned)(pg->index << PAGE_CACHE_SHIFT),
    + (unsigned)PAGE_CACHE_SIZE));
    +
    + obj = yaffs_dentry_to_obj(f->f_dentry);
    +
    + dev = obj->my_dev;
    +
    + BUG_ON(!PageLocked(pg));
    +
    + pg_buf = kmap(pg);
    + /* FIXME: Can kmap fail? */
    +
    + yaffs_gross_lock(dev);
    +
    + ret = yaffs_file_rd(obj, pg_buf,
    + pg->index << PAGE_CACHE_SHIFT,
    + PAGE_CACHE_SIZE);
    +
    + yaffs_gross_unlock(dev);
    +
    + if (ret >= 0)
    + ret = 0;
    +
    + if (ret) {
    + ClearPageUptodate(pg);
    + SetPageError(pg);
    + } else {
    + SetPageUptodate(pg);
    + ClearPageError(pg);
    + }
    +
    + flush_dcache_page(pg);
    + kunmap(pg);
    +
    + T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage_nolock done\n")));
    + return ret;
    +}
    +
    +static int yaffs_readpage_unlock(struct file *f, struct page *pg)
    +{
    + int ret = yaffs_readpage_nolock(f, pg);
    + UnlockPage(pg);
    + return ret;
    +}
    +
    +static int yaffs_readpage(struct file *f, struct page *pg)
    +{
    + int ret;
    +
    + T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage\n")));
    + ret=yaffs_readpage_unlock(f, pg);
    + T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage done\n")));
    + return ret;
    +}
    +
    +/* writepage inspired by/stolen from smbfs */
    +
    +static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
    +{
    + yaffs_dev_t *dev;
    + struct address_space *mapping = page->mapping;
    + struct inode *inode;
    + unsigned long end_index;
    + char *buffer;
    + yaffs_obj_t *obj;
    + int n_written = 0;
    + unsigned n_bytes;
    + loff_t i_size;
    +
    + if (!mapping)
    + BUG();
    + inode = mapping->host;
    + if (!inode)
    + BUG();
    + i_size = i_size_read(inode);
    +
    + end_index = i_size >> PAGE_CACHE_SHIFT;
    +
    + if(page->index < end_index)
    + n_bytes = PAGE_CACHE_SIZE;
    + else {
    + n_bytes = i_size & (PAGE_CACHE_SIZE -1);
    +
    + if (page->index > end_index || !n_bytes) {
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_writepage at %08x, inode size = %08x!!!\n"),
    + (unsigned)(page->index << PAGE_CACHE_SHIFT),
    + (unsigned)inode->i_size));
    + T(YAFFS_TRACE_OS,
    + (TSTR(" -> don't care!!\n")));
    +
    + zero_user_segment(page,0,PAGE_CACHE_SIZE);
    + set_page_writeback(page);
    + unlock_page(page);
    + end_page_writeback(page);
    + return 0;
    + }
    + }
    +
    + if(n_bytes != PAGE_CACHE_SIZE)
    + zero_user_segment(page,n_bytes,PAGE_CACHE_SIZE);
    +
    + get_page(page);
    +
    + buffer = kmap(page);
    +
    + obj = yaffs_inode_to_obj(inode);
    + dev = obj->my_dev;
    + yaffs_gross_lock(dev);
    +
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_writepage at %08x, size %08x\n"),
    + (unsigned)(page->index << PAGE_CACHE_SHIFT), n_bytes));
    + T(YAFFS_TRACE_OS,
    + (TSTR("writepag0: obj = %05x, ino = %05x\n"),
    + (int)obj->variant.file_variant.file_size, (int)inode->i_size));
    +
    + n_written = yaffs_wr_file(obj, buffer,
    + page->index << PAGE_CACHE_SHIFT, n_bytes, 0);
    +
    + yaffs_touch_super(dev);
    +
    + T(YAFFS_TRACE_OS,
    + (TSTR("writepag1: obj = %05x, ino = %05x\n"),
    + (int)obj->variant.file_variant.file_size, (int)inode->i_size));
    +
    + yaffs_gross_unlock(dev);
    +
    + kunmap(page);
    + set_page_writeback(page);
    + unlock_page(page);
    + end_page_writeback(page);
    + put_page(page);
    +
    + return (n_written == n_bytes) ? 0 : -ENOSPC;
    +}
    +
    +
    +static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
    + loff_t pos, unsigned len, unsigned flags,
    + struct page **pagep, void **fsdata)
    +{
    + struct page *pg = NULL;
    + pgoff_t index = pos >> PAGE_CACHE_SHIFT;
    +
    + int ret = 0;
    + int space_held = 0;
    +
    + /* Get a page */
    + pg = grab_cache_page_write_begin(mapping, index, flags);
    +
    + *pagep = pg;
    + if (!pg) {
    + ret = -ENOMEM;
    + goto out;
    + }
    + T(YAFFS_TRACE_OS,
    + (TSTR("start yaffs_write_begin index %d(%x) uptodate %d\n"),
    + (int)index,(int)index,Page_Uptodate(pg) ? 1 : 0));
    +
    + /* Get fs space */
    + space_held = yaffs_hold_space(filp);
    +
    + if (!space_held) {
    + ret = -ENOSPC;
    + goto out;
    + }
    +
    + /* Update page if required */
    +
    + if (!Page_Uptodate(pg))
    + ret = yaffs_readpage_nolock(filp, pg);
    +
    + if (ret)
    + goto out;
    +
    + /* Happy path return */
    + T(YAFFS_TRACE_OS, (TSTR("end yaffs_write_begin - ok\n")));
    +
    + return 0;
    +
    +out:
    + T(YAFFS_TRACE_OS,
    + (TSTR("end yaffs_write_begin fail returning %d\n"), ret));
    + if (space_held)
    + yaffs_release_space(filp);
    + if (pg) {
    + unlock_page(pg);
    + page_cache_release(pg);
    + }
    + return ret;
    +}
    +
    +
    +static int yaffs_write_end(struct file *filp, struct address_space *mapping,
    + loff_t pos, unsigned len, unsigned copied,
    + struct page *pg, void *fsdadata)
    +{
    + int ret = 0;
    + void *addr, *kva;
    + uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE - 1);
    +
    + kva = kmap(pg);
    + addr = kva + offset_into_page;
    +
    + T(YAFFS_TRACE_OS,
    + ("yaffs_write_end addr %p pos %x n_bytes %d\n",
    + addr,(unsigned)pos, copied));
    +
    + ret = yaffs_file_write(filp, addr, copied, &pos);
    +
    + if (ret != copied) {
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_write_end not same size ret %d copied %d\n"),
    + ret, copied));
    + SetPageError(pg);
    + } else {
    + /* Nothing */
    + }
    +
    + kunmap(pg);
    +
    + yaffs_release_space(filp);
    + unlock_page(pg);
    + page_cache_release(pg);
    + return ret;
    +}
    +
    +
    +static void yaffs_fill_inode_from_obj(struct inode *inode, yaffs_obj_t *obj)
    +{
    + if (inode && obj) {
    +
    +
    + /* Check mode against the variant type and attempt to repair if broken. */
    + __u32 mode = obj->yst_mode;
    + switch (obj->variant_type) {
    + case YAFFS_OBJECT_TYPE_FILE:
    + if (!S_ISREG(mode)) {
    + obj->yst_mode &= ~S_IFMT;
    + obj->yst_mode |= S_IFREG;
    + }
    +
    + break;
    + case YAFFS_OBJECT_TYPE_SYMLINK:
    + if (!S_ISLNK(mode)) {
    + obj->yst_mode &= ~S_IFMT;
    + obj->yst_mode |= S_IFLNK;
    + }
    +
    + break;
    + case YAFFS_OBJECT_TYPE_DIRECTORY:
    + if (!S_ISDIR(mode)) {
    + obj->yst_mode &= ~S_IFMT;
    + obj->yst_mode |= S_IFDIR;
    + }
    +
    + break;
    + case YAFFS_OBJECT_TYPE_UNKNOWN:
    + case YAFFS_OBJECT_TYPE_HARDLINK:
    + case YAFFS_OBJECT_TYPE_SPECIAL:
    + default:
    + /* TODO? */
    + break;
    + }
    +
    + inode->i_flags |= S_NOATIME;
    +
    + inode->i_ino = obj->obj_id;
    + inode->i_mode = obj->yst_mode;
    + inode->i_uid = obj->yst_uid;
    + inode->i_gid = obj->yst_gid;
    +
    + inode->i_rdev = old_decode_dev(obj->yst_rdev);
    +
    + inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
    + inode->i_atime.tv_nsec = 0;
    + inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
    + inode->i_mtime.tv_nsec = 0;
    + inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
    + inode->i_ctime.tv_nsec = 0;
    + inode->i_size = yaffs_get_obj_length(obj);
    + inode->i_blocks = (inode->i_size + 511) >> 9;
    +
    + inode->i_nlink = yaffs_get_obj_link_count(obj);
    +
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_fill_inode mode %x uid %d gid %d size %d count %d\n"),
    + inode->i_mode, inode->i_uid, inode->i_gid,
    + (int)inode->i_size, atomic_read(&inode->i_count)));
    +
    + switch (obj->yst_mode & S_IFMT) {
    + default: /* fifo, device or socket */
    + init_special_inode(inode, obj->yst_mode,
    + old_decode_dev(obj->yst_rdev));
    + break;
    + case S_IFREG: /* file */
    + inode->i_op = &yaffs_file_inode_operations;
    + inode->i_fop = &yaffs_file_operations;
    + inode->i_mapping->a_ops =
    + &yaffs_file_address_operations;
    + break;
    + case S_IFDIR: /* directory */
    + inode->i_op = &yaffs_dir_inode_operations;
    + inode->i_fop = &yaffs_dir_operations;
    + break;
    + case S_IFLNK: /* symlink */
    + inode->i_op = &yaffs_symlink_inode_operations;
    + break;
    + }
    +
    + yaffs_inode_to_obj_lv(inode) = obj;
    +
    + obj->my_inode = inode;
    +
    + } else {
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_fill_inode invalid parameters\n")));
    + }
    +
    +}
    +
    +struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
    + yaffs_obj_t *obj)
    +{
    + struct inode *inode;
    +
    + if (!sb) {
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_get_inode for NULL super_block!!\n")));
    + return NULL;
    +
    + }
    +
    + if (!obj) {
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_get_inode for NULL object!!\n")));
    + return NULL;
    +
    + }
    +
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_get_inode for object %d\n"), obj->obj_id));
    +
    + inode = Y_IGET(sb, obj->obj_id);
    + if (IS_ERR(inode))
    + return NULL;
    +
    + /* NB Side effect: iget calls back to yaffs_read_inode(). */
    + /* iget also increments the inode's i_count */
    + /* NB You can't be holding gross_lock or deadlock will happen! */
    +
    + return inode;
    +}
    +
    +static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
    + loff_t *pos)
    +{
    + yaffs_obj_t *obj;
    + int n_written, ipos;
    + struct inode *inode;
    + yaffs_dev_t *dev;
    +
    + obj = yaffs_dentry_to_obj(f->f_dentry);
    +
    + dev = obj->my_dev;
    +
    + yaffs_gross_lock(dev);
    +
    + inode = f->f_dentry->d_inode;
    +
    + if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
    + ipos = inode->i_size;
    + else
    + ipos = *pos;
    +
    + if (!obj)
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_file_write: hey obj is null!\n")));
    + else
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_file_write about to write writing %u(%x) bytes"
    + "to object %d at %d(%x)\n"),
    + (unsigned) n, (unsigned) n, obj->obj_id, ipos,ipos));
    +
    + n_written = yaffs_wr_file(obj, buf, ipos, n, 0);
    +
    + yaffs_touch_super(dev);
    +
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_file_write: %d(%x) bytes written\n"),
    + (unsigned )n,(unsigned)n));
    +
    + if (n_written > 0) {
    + ipos += n_written;
    + *pos = ipos;
    + if (ipos > inode->i_size) {
    + inode->i_size = ipos;
    + inode->i_blocks = (ipos + 511) >> 9;
    +
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_file_write size updated to %d bytes, "
    + "%d blocks\n"),
    + ipos, (int)(inode->i_blocks)));
    + }
    +
    + }
    + yaffs_gross_unlock(dev);
    + return (n_written == 0) && (n > 0) ? -ENOSPC : n_written;
    +}
    +
    +/* Space holding and freeing is done to ensure we have space available for write_begin/end */
    +/* For now we just assume few parallel writes and check against a small number. */
    +/* Todo: need to do this with a counter to handle parallel reads better */
    +
    +static ssize_t yaffs_hold_space(struct file *f)
    +{
    + yaffs_obj_t *obj;
    + yaffs_dev_t *dev;
    +
    + int n_free_chunks;
    +
    +
    + obj = yaffs_dentry_to_obj(f->f_dentry);
    +
    + dev = obj->my_dev;
    +
    + yaffs_gross_lock(dev);
    +
    + n_free_chunks = yaffs_get_n_free_chunks(dev);
    +
    + yaffs_gross_unlock(dev);
    +
    + return (n_free_chunks > 20) ? 1 : 0;
    +}
    +
    +static void yaffs_release_space(struct file *f)
    +{
    + yaffs_obj_t *obj;
    + yaffs_dev_t *dev;
    +
    +
    + obj = yaffs_dentry_to_obj(f->f_dentry);
    +
    + dev = obj->my_dev;
    +
    + yaffs_gross_lock(dev);
    +
    +
    + yaffs_gross_unlock(dev);
    +}
    +
    +
    +static loff_t yaffs_dir_llseek(struct file *file, loff_t offset, int origin)
    +{
    + long long retval;
    +
    + lock_kernel();
    +
    + switch (origin){
    + case 2:
    + offset += i_size_read(file->f_path.dentry->d_inode);
    + break;
    + case 1:
    + offset += file->f_pos;
    + }
    + retval = -EINVAL;
    +
    + if (offset >= 0){
    + if (offset != file->f_pos)
    + file->f_pos = offset;
    +
    + retval = offset;
    + }
    + unlock_kernel();
    + return retval;
    +}
    +
    +
    +static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
    +{
    + yaffs_obj_t *obj;
    + yaffs_dev_t *dev;
    + struct yaffs_search_context *sc;
    + struct inode *inode = f->f_dentry->d_inode;
    + unsigned long offset, curoffs;
    + yaffs_obj_t *l;
    + int ret_val = 0;
    +
    + char name[YAFFS_MAX_NAME_LENGTH + 1];
    +
    + obj = yaffs_dentry_to_obj(f->f_dentry);
    + dev = obj->my_dev;
    +
    + yaffs_gross_lock(dev);
    +
    + yaffs_dev_to_lc(dev)->readdir_process = current;
    +
    + offset = f->f_pos;
    +
    + sc = yaffs_new_search(obj);
    + if(!sc){
    + ret_val = -ENOMEM;
    + goto out;
    + }
    +
    + T(YAFFS_TRACE_OS, (TSTR("yaffs_readdir: starting at %d\n"), (int)offset));
    +
    + if (offset == 0) {
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_readdir: entry . ino %d \n"),
    + (int)inode->i_ino));
    + yaffs_gross_unlock(dev);
    + if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0){
    + yaffs_gross_lock(dev);
    + goto out;
    + }
    + yaffs_gross_lock(dev);
    + offset++;
    + f->f_pos++;
    + }
    + if (offset == 1) {
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_readdir: entry .. ino %d \n"),
    + (int)f->f_dentry->d_parent->d_inode->i_ino));
    + yaffs_gross_unlock(dev);
    + if (filldir(dirent, "..", 2, offset,
    + f->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0){
    + yaffs_gross_lock(dev);
    + goto out;
    + }
    + yaffs_gross_lock(dev);
    + offset++;
    + f->f_pos++;
    + }
    +
    + curoffs = 1;
    +
    + /* If the directory has changed since the open or last call to
    + readdir, rewind to after the 2 canned entries. */
    + if (f->f_version != inode->i_version) {
    + offset = 2;
    + f->f_pos = offset;
    + f->f_version = inode->i_version;
    + }
    +
    + while(sc->next_return){
    + curoffs++;
    + l = sc->next_return;
    + if (curoffs >= offset) {
    + int this_inode = yaffs_get_obj_inode(l);
    + int this_type = yaffs_get_obj_type(l);
    +
    + yaffs_get_obj_name(l, name,
    + YAFFS_MAX_NAME_LENGTH + 1);
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_readdir: %s inode %d\n"),
    + name, yaffs_get_obj_inode(l)));
    +
    + yaffs_gross_unlock(dev);
    +
    + if (filldir(dirent,
    + name,
    + strlen(name),
    + offset,
    + this_inode,
    + this_type) < 0){
    + yaffs_gross_lock(dev);
    + goto out;
    + }
    +
    + yaffs_gross_lock(dev);
    +
    + offset++;
    + f->f_pos++;
    + }
    + yaffs_search_advance(sc);
    + }
    +
    +out:
    + yaffs_search_end(sc);
    + yaffs_dev_to_lc(dev)->readdir_process = NULL;
    + yaffs_gross_unlock(dev);
    +
    + return ret_val;
    +}
    +
    +
    +
    +/*
    + * File creation. Allocate an inode, and we're done..
    + */
    +
    +#define YCRED(x) (x->cred)
    +
    +static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
    + dev_t rdev)
    +{
    + struct inode *inode;
    +
    + yaffs_obj_t *obj = NULL;
    + yaffs_dev_t *dev;
    +
    + yaffs_obj_t *parent = yaffs_inode_to_obj(dir);
    +
    + int error = -ENOSPC;
    + uid_t uid = YCRED(current)->fsuid;
    + gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
    +
    + if ((dir->i_mode & S_ISGID) && S_ISDIR(mode))
    + mode |= S_ISGID;
    +
    + if (parent) {
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_mknod: parent object %d type %d\n"),
    + parent->obj_id, parent->variant_type));
    + } else {
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_mknod: could not get parent object\n")));
    + return -EPERM;
    + }
    +
    + T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making oject for %s, "
    + "mode %x dev %x\n"),
    + dentry->d_name.name, mode, rdev));
    +
    + dev = parent->my_dev;
    +
    + yaffs_gross_lock(dev);
    +
    + switch (mode & S_IFMT) {
    + default:
    + /* Special (socket, fifo, device...) */
    + T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making special\n")));
    + obj = yaffs_create_special(parent, dentry->d_name.name, mode, uid,
    + gid, old_encode_dev(rdev));
    + break;
    + case S_IFREG: /* file */
    + T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making file\n")));
    + obj = yaffs_create_file(parent, dentry->d_name.name, mode, uid,
    + gid);
    + break;
    + case S_IFDIR: /* directory */
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_mknod: making directory\n")));
    + obj = yaffs_create_dir(parent, dentry->d_name.name, mode,
    + uid, gid);
    + break;
    + case S_IFLNK: /* symlink */
    + T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making symlink\n")));
    + obj = NULL; /* Do we ever get here? */
    + break;
    + }
    +
    + /* Can not call yaffs_get_inode() with gross lock held */
    + yaffs_gross_unlock(dev);
    +
    + if (obj) {
    + inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
    + d_instantiate(dentry, inode);
    + update_dir_time(dir);
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_mknod created object %d count = %d\n"),
    + obj->obj_id, atomic_read(&inode->i_count)));
    + error = 0;
    + yaffs_fill_inode_from_obj(dir,parent);
    + } else {
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_mknod failed making object\n")));
    + error = -ENOMEM;
    + }
    +
    + return error;
    +}
    +
    +static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
    +{
    + int ret_val;
    + T(YAFFS_TRACE_OS, (TSTR("yaffs_mkdir\n")));
    + ret_val = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
    + return ret_val;
    +}
    +
    +static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
    + struct nameidata *n)
    +{
    + T(YAFFS_TRACE_OS,(TSTR("yaffs_create\n")));
    + return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
    +}
    +
    +static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
    +{
    + int ret_val;
    +
    + yaffs_dev_t *dev;
    + yaffs_obj_t *obj;
    +
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_unlink %d:%s\n"),
    + (int)(dir->i_ino),
    + dentry->d_name.name));
    + obj = yaffs_inode_to_obj(dir);
    + dev = obj->my_dev;
    +
    + yaffs_gross_lock(dev);
    +
    + ret_val = yaffs_unlinker(obj, dentry->d_name.name);
    +
    + if (ret_val == YAFFS_OK) {
    + dentry->d_inode->i_nlink--;
    + dir->i_version++;
    + yaffs_gross_unlock(dev);
    + mark_inode_dirty(dentry->d_inode);
    + update_dir_time(dir);
    + return 0;
    + }
    + yaffs_gross_unlock(dev);
    + return -ENOTEMPTY;
    +}
    +
    +/*
    + * Create a link...
    + */
    +static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
    + struct dentry *dentry)
    +{
    + struct inode *inode = old_dentry->d_inode;
    + yaffs_obj_t *obj = NULL;
    + yaffs_obj_t *link = NULL;
    + yaffs_dev_t *dev;
    +
    + T(YAFFS_TRACE_OS, (TSTR("yaffs_link\n")));
    +
    + obj = yaffs_inode_to_obj(inode);
    + dev = obj->my_dev;
    +
    + yaffs_gross_lock(dev);
    +
    + if (!S_ISDIR(inode->i_mode)) /* Don't link directories */
    + link = yaffs_link_obj(yaffs_inode_to_obj(dir), dentry->d_name.name,
    + obj);
    +
    + if (link) {
    + old_dentry->d_inode->i_nlink = yaffs_get_obj_link_count(obj);
    + d_instantiate(dentry, old_dentry->d_inode);
    + atomic_inc(&old_dentry->d_inode->i_count);
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_link link count %d i_count %d\n"),
    + old_dentry->d_inode->i_nlink,
    + atomic_read(&old_dentry->d_inode->i_count)));
    + }
    +
    + yaffs_gross_unlock(dev);
    +
    + if (link){
    + update_dir_time(dir);
    + return 0;
    + }
    +
    + return -EPERM;
    +}
    +
    +static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
    + const char *symname)
    +{
    + yaffs_obj_t *obj;
    + yaffs_dev_t *dev;
    + uid_t uid = YCRED(current)->fsuid;
    + gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
    +
    + T(YAFFS_TRACE_OS, (TSTR("yaffs_symlink\n")));
    +
    + dev = yaffs_inode_to_obj(dir)->my_dev;
    + yaffs_gross_lock(dev);
    + obj = yaffs_create_symlink(yaffs_inode_to_obj(dir), dentry->d_name.name,
    + S_IFLNK | S_IRWXUGO, uid, gid, symname);
    + yaffs_gross_unlock(dev);
    +
    + if (obj) {
    + struct inode *inode;
    +
    + inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
    + d_instantiate(dentry, inode);
    + update_dir_time(dir);
    + T(YAFFS_TRACE_OS, (TSTR("symlink created OK\n")));
    + return 0;
    + } else {
    + T(YAFFS_TRACE_OS, (TSTR("symlink not created\n")));
    + }
    +
    + return -ENOMEM;
    +}
    +
    +static int yaffs_sync_object(struct file *file, int datasync)
    +{
    +
    + yaffs_obj_t *obj;
    + yaffs_dev_t *dev;
    + struct dentry *dentry = file->f_path.dentry;
    +
    + obj = yaffs_dentry_to_obj(dentry);
    +
    + dev = obj->my_dev;
    +
    + T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
    + (TSTR("yaffs_sync_object\n")));
    + yaffs_gross_lock(dev);
    + yaffs_flush_file(obj, 1, datasync);
    + yaffs_gross_unlock(dev);
    + return 0;
    +}
    +
    +/*
    + * The VFS layer already does all the dentry stuff for rename.
    + *
    + * NB: POSIX says you can rename an object over an old object of the same name
    + */
    +static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
    + struct inode *new_dir, struct dentry *new_dentry)
    +{
    + yaffs_dev_t *dev;
    + int ret_val = YAFFS_FAIL;
    + yaffs_obj_t *target;
    +
    + T(YAFFS_TRACE_OS, (TSTR("yaffs_rename\n")));
    + dev = yaffs_inode_to_obj(old_dir)->my_dev;
    +
    + yaffs_gross_lock(dev);
    +
    + /* Check if the target is an existing directory that is not empty. */
    + target = yaffs_find_by_name(yaffs_inode_to_obj(new_dir),
    + new_dentry->d_name.name);
    +
    +
    +
    + if (target && target->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY &&
    + !ylist_empty(&target->variant.dir_variant.children)) {
    +
    + T(YAFFS_TRACE_OS, (TSTR("target is non-empty dir\n")));
    +
    + ret_val = YAFFS_FAIL;
    + } else {
    + /* Now does unlinking internally using shadowing mechanism */
    + T(YAFFS_TRACE_OS, (TSTR("calling yaffs_rename_obj\n")));
    +
    + ret_val = yaffs_rename_obj(yaffs_inode_to_obj(old_dir),
    + old_dentry->d_name.name,
    + yaffs_inode_to_obj(new_dir),
    + new_dentry->d_name.name);
    + }
    + yaffs_gross_unlock(dev);
    +
    + if (ret_val == YAFFS_OK) {
    + if (target) {
    + new_dentry->d_inode->i_nlink--;
    + mark_inode_dirty(new_dentry->d_inode);
    + }
    +
    + update_dir_time(old_dir);
    + if(old_dir != new_dir)
    + update_dir_time(new_dir);
    + return 0;
    + } else {
    + return -ENOTEMPTY;
    + }
    +}
    +
    +static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
    +{
    + struct inode *inode = dentry->d_inode;
    + int error = 0;
    + yaffs_dev_t *dev;
    +
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_setattr of object %d\n"),
    + yaffs_inode_to_obj(inode)->obj_id));
    +
    + /* Fail if a requested resize >= 2GB */
    + if (attr->ia_valid & ATTR_SIZE &&
    + (attr->ia_size >> 31))
    + error = -EINVAL;
    +
    + if (error == 0)
    + error = inode_change_ok(inode, attr);
    + if (error == 0) {
    + int result;
    + if (!error){
    + error = yaffs_vfs_setattr(inode, attr);
    + T(YAFFS_TRACE_OS,(TSTR("inode_setattr called\n")));
    + if (attr->ia_valid & ATTR_SIZE){
    + yaffs_vfs_setsize(inode,attr->ia_size);
    + inode->i_blocks = (inode->i_size + 511) >> 9;
    + }
    + }
    + dev = yaffs_inode_to_obj(inode)->my_dev;
    + if (attr->ia_valid & ATTR_SIZE){
    + T(YAFFS_TRACE_OS,(TSTR("resize to %d(%x)\n"),
    + (int)(attr->ia_size),(int)(attr->ia_size)));
    + }
    + yaffs_gross_lock(dev);
    + result = yaffs_set_attribs(yaffs_inode_to_obj(inode), attr);
    + if(result == YAFFS_OK) {
    + error = 0;
    + } else {
    + error = -EPERM;
    + }
    + yaffs_gross_unlock(dev);
    +
    + }
    +
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_setattr done returning %d\n"),error));
    +
    + return error;
    +}
    +
    +#ifdef CONFIG_YAFFS_XATTR
    +int yaffs_setxattr(struct dentry *dentry, const char *name,
    + const void *value, size_t size, int flags)
    +{
    + struct inode *inode = dentry->d_inode;
    + int error = 0;
    + yaffs_dev_t *dev;
    + yaffs_obj_t *obj = yaffs_inode_to_obj(inode);
    +
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_setxattr of object %d\n"),
    + obj->obj_id));
    +
    +
    + if (error == 0) {
    + int result;
    + dev = obj->my_dev;
    + yaffs_gross_lock(dev);
    + result = yaffs_set_xattrib(obj, name, value, size, flags);
    + if(result == YAFFS_OK)
    + error = 0;
    + else if(result < 0)
    + error = result;
    + yaffs_gross_unlock(dev);
    +
    + }
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_setxattr done returning %d\n"),error));
    +
    + return error;
    +}
    +
    +
    +ssize_t yaffs_getxattr(struct dentry *dentry, const char *name, void *buff,
    + size_t size)
    +{
    + struct inode *inode = dentry->d_inode;
    + int error = 0;
    + yaffs_dev_t *dev;
    + yaffs_obj_t *obj = yaffs_inode_to_obj(inode);
    +
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_getxattr \"%s\" from object %d\n"),
    + name, obj->obj_id));
    +
    + if (error == 0) {
    + dev = obj->my_dev;
    + yaffs_gross_lock(dev);
    + error = yaffs_get_xattrib(obj, name, buff, size);
    + yaffs_gross_unlock(dev);
    +
    + }
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_getxattr done returning %d\n"),error));
    +
    + return error;
    +}
    +
    +int yaffs_removexattr(struct dentry *dentry, const char *name)
    +{
    + struct inode *inode = dentry->d_inode;
    + int error = 0;
    + yaffs_dev_t *dev;
    + yaffs_obj_t *obj = yaffs_inode_to_obj(inode);
    +
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_removexattr of object %d\n"),
    + obj->obj_id));
    +
    +
    + if (error == 0) {
    + int result;
    + dev = obj->my_dev;
    + yaffs_gross_lock(dev);
    + result = yaffs_remove_xattrib(obj, name);
    + if(result == YAFFS_OK)
    + error = 0;
    + else if(result < 0)
    + error = result;
    + yaffs_gross_unlock(dev);
    +
    + }
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_removexattr done returning %d\n"),error));
    +
    + return error;
    +}
    +
    +ssize_t yaffs_listxattr(struct dentry *dentry, char *buff, size_t size)
    +{
    + struct inode *inode = dentry->d_inode;
    + int error = 0;
    + yaffs_dev_t *dev;
    + yaffs_obj_t *obj = yaffs_inode_to_obj(inode);
    +
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_listxattr of object %d\n"),
    + obj->obj_id));
    +
    +
    + if (error == 0) {
    + dev = obj->my_dev;
    + yaffs_gross_lock(dev);
    + error = yaffs_list_xattrib(obj, buff, size);
    + yaffs_gross_unlock(dev);
    +
    + }
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_listxattr done returning %d\n"),error));
    +
    + return error;
    +}
    +
    +#endif
    +
    +
    +static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
    +{
    + yaffs_dev_t *dev = yaffs_dentry_to_obj(dentry)->my_dev;
    + struct super_block *sb = dentry->d_sb;
    +
    + T(YAFFS_TRACE_OS, (TSTR("yaffs_statfs\n")));
    +
    + yaffs_gross_lock(dev);
    +
    + buf->f_type = YAFFS_MAGIC;
    + buf->f_bsize = sb->s_blocksize;
    + buf->f_namelen = 255;
    +
    + if (dev->data_bytes_per_chunk & (dev->data_bytes_per_chunk - 1)) {
    + /* Do this if chunk size is not a power of 2 */
    +
    + uint64_t bytes_in_dev;
    + uint64_t bytes_free;
    +
    + bytes_in_dev = ((uint64_t)((dev->param.end_block - dev->param.start_block + 1))) *
    + ((uint64_t)(dev->param.chunks_per_block * dev->data_bytes_per_chunk));
    +
    + do_div(bytes_in_dev, sb->s_blocksize); /* bytes_in_dev becomes the number of blocks */
    + buf->f_blocks = bytes_in_dev;
    +
    + bytes_free = ((uint64_t)(yaffs_get_n_free_chunks(dev))) *
    + ((uint64_t)(dev->data_bytes_per_chunk));
    +
    + do_div(bytes_free, sb->s_blocksize);
    +
    + buf->f_bfree = bytes_free;
    +
    + } else if (sb->s_blocksize > dev->data_bytes_per_chunk) {
    +
    + buf->f_blocks =
    + (dev->param.end_block - dev->param.start_block + 1) *
    + dev->param.chunks_per_block /
    + (sb->s_blocksize / dev->data_bytes_per_chunk);
    + buf->f_bfree =
    + yaffs_get_n_free_chunks(dev) /
    + (sb->s_blocksize / dev->data_bytes_per_chunk);
    + } else {
    + buf->f_blocks =
    + (dev->param.end_block - dev->param.start_block + 1) *
    + dev->param.chunks_per_block *
    + (dev->data_bytes_per_chunk / sb->s_blocksize);
    +
    + buf->f_bfree =
    + yaffs_get_n_free_chunks(dev) *
    + (dev->data_bytes_per_chunk / sb->s_blocksize);
    + }
    +
    + buf->f_files = 0;
    + buf->f_ffree = 0;
    + buf->f_bavail = buf->f_bfree;
    +
    + yaffs_gross_unlock(dev);
    + return 0;
    +}
    +
    +
    +
    +static void yaffs_flush_inodes(struct super_block *sb)
    +{
    + struct inode *iptr;
    + yaffs_obj_t *obj;
    +
    + list_for_each_entry(iptr,&sb->s_inodes, i_sb_list){
    + obj = yaffs_inode_to_obj(iptr);
    + if(obj){
    + T(YAFFS_TRACE_OS, (TSTR("flushing obj %d\n"),
    + obj->obj_id));
    + yaffs_flush_file(obj,1,0);
    + }
    + }
    +}
    +
    +
    +static void yaffs_flush_super(struct super_block *sb, int do_checkpoint)
    +{
    + yaffs_dev_t *dev = yaffs_super_to_dev(sb);
    + if(!dev)
    + return;
    +
    + yaffs_flush_inodes(sb);
    + yaffs_update_dirty_dirs(dev);
    + yaffs_flush_whole_cache(dev);
    + if(do_checkpoint)
    + yaffs_checkpoint_save(dev);
    +}
    +
    +
    +static unsigned yaffs_bg_gc_urgency(yaffs_dev_t *dev)
    +{
    + unsigned erased_chunks = dev->n_erased_blocks * dev->param.chunks_per_block;
    + struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
    + unsigned scattered = 0; /* Free chunks not in an erased block */
    +
    + if(erased_chunks < dev->n_free_chunks)
    + scattered = (dev->n_free_chunks - erased_chunks);
    +
    + if(!context->bg_running)
    + return 0;
    + else if(scattered < (dev->param.chunks_per_block * 2))
    + return 0;
    + else if(erased_chunks > dev->n_free_chunks/2)
    + return 0;
    + else if(erased_chunks > dev->n_free_chunks/4)
    + return 1;
    + else
    + return 2;
    +}
    +
    +static int yaffs_do_sync_fs(struct super_block *sb,
    + int request_checkpoint)
    +{
    +
    + yaffs_dev_t *dev = yaffs_super_to_dev(sb);
    + unsigned int oneshot_checkpoint = (yaffs_auto_checkpoint & 4);
    + unsigned gc_urgent = yaffs_bg_gc_urgency(dev);
    + int do_checkpoint;
    +
    + T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
    + (TSTR("yaffs_do_sync_fs: gc-urgency %d %s %s%s\n"),
    + gc_urgent,
    + sb->s_dirt ? "dirty" : "clean",
    + request_checkpoint ? "checkpoint requested" : "no checkpoint",
    + oneshot_checkpoint ? " one-shot" : "" ));
    +
    + yaffs_gross_lock(dev);
    + do_checkpoint = ((request_checkpoint && !gc_urgent) ||
    + oneshot_checkpoint) &&
    + !dev->is_checkpointed;
    +
    + if (sb->s_dirt || do_checkpoint) {
    + yaffs_flush_super(sb, !dev->is_checkpointed && do_checkpoint);
    + sb->s_dirt = 0;
    + if(oneshot_checkpoint)
    + yaffs_auto_checkpoint &= ~4;
    + }
    + yaffs_gross_unlock(dev);
    +
    + return 0;
    +}
    +
    +/*
    + * yaffs background thread functions .
    + * yaffs_bg_thread_fn() the thread function
    + * yaffs_bg_start() launches the background thread.
    + * yaffs_bg_stop() cleans up the background thread.
    + *
    + * NB:
    + * The thread should only run after the yaffs is initialised
    + * The thread should be stopped before yaffs is unmounted.
    + * The thread should not do any writing while the fs is in read only.
    + */
    +
    +
    +void yaffs_background_waker(unsigned long data)
    +{
    + wake_up_process((struct task_struct *)data);
    +}
    +
    +static int yaffs_bg_thread_fn(void *data)
    +{
    + yaffs_dev_t *dev = (yaffs_dev_t *)data;
    + struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
    + unsigned long now = jiffies;
    + unsigned long next_dir_update = now;
    + unsigned long next_gc = now;
    + unsigned long expires;
    + unsigned int urgency;
    +
    + int gc_result;
    + struct timer_list timer;
    +
    + T(YAFFS_TRACE_BACKGROUND,
    + (TSTR("yaffs_background starting for dev %p\n"),
    + (void *)dev));
    +
    + set_freezable();
    + while(context->bg_running){
    + T(YAFFS_TRACE_BACKGROUND,
    + (TSTR("yaffs_background\n")));
    +
    + if(kthread_should_stop())
    + break;
    +
    + if(try_to_freeze())
    + continue;
    +
    + yaffs_gross_lock(dev);
    +
    + now = jiffies;
    +
    + if(time_after(now, next_dir_update) && yaffs_bg_enable){
    + yaffs_update_dirty_dirs(dev);
    + next_dir_update = now + HZ;
    + }
    +
    + if(time_after(now,next_gc) && yaffs_bg_enable){
    + if(!dev->is_checkpointed){
    + urgency = yaffs_bg_gc_urgency(dev);
    + gc_result = yaffs_bg_gc(dev, urgency);
    + if(urgency > 1)
    + next_gc = now + HZ/20+1;
    + else if(urgency > 0)
    + next_gc = now + HZ/10+1;
    + else
    + next_gc = now + HZ * 2;
    + } else /*
    + * gc not running so set to next_dir_update
    + * to cut down on wake ups
    + */
    + next_gc = next_dir_update;
    + }
    + yaffs_gross_unlock(dev);
    + expires = next_dir_update;
    + if (time_before(next_gc,expires))
    + expires = next_gc;
    + if(time_before(expires,now))
    + expires = now + HZ;
    +
    + Y_INIT_TIMER(&timer);
    + timer.expires = expires+1;
    + timer.data = (unsigned long) current;
    + timer.function = yaffs_background_waker;
    +
    + set_current_state(TASK_INTERRUPTIBLE);
    + add_timer(&timer);
    + schedule();
    + del_timer_sync(&timer);
    + }
    +
    + return 0;
    +}
    +
    +static int yaffs_bg_start(yaffs_dev_t *dev)
    +{
    + int retval = 0;
    + struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
    +
    + if(dev->read_only)
    + return -1;
    +
    + context->bg_running = 1;
    +
    + context->bg_thread = kthread_run(yaffs_bg_thread_fn,
    + (void *)dev,"yaffs-bg-%d",context->mount_id);
    +
    + if(IS_ERR(context->bg_thread)){
    + retval = PTR_ERR(context->bg_thread);
    + context->bg_thread = NULL;
    + context->bg_running = 0;
    + }
    + return retval;
    +}
    +
    +static void yaffs_bg_stop(yaffs_dev_t *dev)
    +{
    + struct yaffs_linux_context *ctxt = yaffs_dev_to_lc(dev);
    +
    + ctxt->bg_running = 0;
    +
    + if( ctxt->bg_thread){
    + kthread_stop(ctxt->bg_thread);
    + ctxt->bg_thread = NULL;
    + }
    +}
    +
    +
    +static void yaffs_write_super(struct super_block *sb)
    +{
    + unsigned request_checkpoint = (yaffs_auto_checkpoint >= 2);
    +
    + T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
    + (TSTR("yaffs_write_super%s\n"),
    + request_checkpoint ? " checkpt" : ""));
    +
    + yaffs_do_sync_fs(sb, request_checkpoint);
    +
    +}
    +
    +
    +static int yaffs_sync_fs(struct super_block *sb, int wait)
    +{
    + unsigned request_checkpoint = (yaffs_auto_checkpoint >= 1);
    +
    + T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
    + (TSTR("yaffs_sync_fs%s\n"),
    + request_checkpoint ? " checkpt" : ""));
    +
    + yaffs_do_sync_fs(sb, request_checkpoint);
    +
    + return 0;
    +}
    +
    +static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino)
    +{
    + struct inode *inode;
    + yaffs_obj_t *obj;
    + yaffs_dev_t *dev = yaffs_super_to_dev(sb);
    +
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_iget for %lu\n"), ino));
    +
    + inode = iget_locked(sb, ino);
    + if (!inode)
    + return ERR_PTR(-ENOMEM);
    + if (!(inode->i_state & I_NEW))
    + return inode;
    +
    + /* NB This is called as a side effect of other functions, but
    + * we had to release the lock to prevent deadlocks, so
    + * need to lock again.
    + */
    +
    + yaffs_gross_lock(dev);
    +
    + obj = yaffs_find_by_number(dev, inode->i_ino);
    +
    + yaffs_fill_inode_from_obj(inode, obj);
    +
    + yaffs_gross_unlock(dev);
    +
    + unlock_new_inode(inode);
    + return inode;
    +}
    +
    +static YLIST_HEAD(yaffs_context_list);
    +struct semaphore yaffs_context_lock;
    +
    +static void yaffs_put_super(struct super_block *sb)
    +{
    + yaffs_dev_t *dev = yaffs_super_to_dev(sb);
    +
    + T(YAFFS_TRACE_OS, (TSTR("yaffs_put_super\n")));
    +
    + T(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
    + (TSTR("Shutting down yaffs background thread\n")));
    + yaffs_bg_stop(dev);
    + T(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
    + (TSTR("yaffs background thread shut down\n")));
    +
    + yaffs_gross_lock(dev);
    +
    + yaffs_flush_super(sb,1);
    +
    + if (yaffs_dev_to_lc(dev)->put_super_fn)
    + yaffs_dev_to_lc(dev)->put_super_fn(sb);
    +
    +
    + yaffs_deinitialise(dev);
    +
    + yaffs_gross_unlock(dev);
    +
    + down(&yaffs_context_lock);
    + ylist_del_init(&(yaffs_dev_to_lc(dev)->context_list));
    + up(&yaffs_context_lock);
    +
    + if (yaffs_dev_to_lc(dev)->spare_buffer) {
    + YFREE(yaffs_dev_to_lc(dev)->spare_buffer);
    + yaffs_dev_to_lc(dev)->spare_buffer = NULL;
    + }
    +
    + kfree(dev);
    +}
    +
    +
    +static void yaffs_mtd_put_super(struct super_block *sb)
    +{
    + struct mtd_info *mtd = yaffs_dev_to_mtd(yaffs_super_to_dev(sb));
    +
    + if (mtd->sync)
    + mtd->sync(mtd);
    +
    + put_mtd_device(mtd);
    +}
    +
    +
    +static void yaffs_touch_super(yaffs_dev_t *dev)
    +{
    + struct super_block *sb = yaffs_dev_to_lc(dev)->super;
    +
    + T(YAFFS_TRACE_OS, (TSTR("yaffs_touch_super() sb = %p\n"), sb));
    + if (sb)
    + sb->s_dirt = 1;
    +}
    +
    +typedef struct {
    + int inband_tags;
    + int skip_checkpoint_read;
    + int skip_checkpoint_write;
    + int no_cache;
    + int tags_ecc_on;
    + int tags_ecc_overridden;
    + int lazy_loading_enabled;
    + int lazy_loading_overridden;
    + int empty_lost_and_found;
    + int empty_lost_and_found_overridden;
    +} yaffs_options;
    +
    +#define MAX_OPT_LEN 30
    +static int yaffs_parse_options(yaffs_options *options, const char *options_str)
    +{
    + char cur_opt[MAX_OPT_LEN + 1];
    + int p;
    + int error = 0;
    +
    + /* Parse through the options which is a comma seperated list */
    +
    + while (options_str && *options_str && !error) {
    + memset(cur_opt, 0, MAX_OPT_LEN + 1);
    + p = 0;
    +
    + while(*options_str == ',')
    + options_str++;
    +
    + while (*options_str && *options_str != ',') {
    + if (p < MAX_OPT_LEN) {
    + cur_opt[p] = *options_str;
    + p++;
    + }
    + options_str++;
    + }
    +
    + if (!strcmp(cur_opt, "inband-tags"))
    + options->inband_tags = 1;
    + else if (!strcmp(cur_opt, "tags-ecc-off")){
    + options->tags_ecc_on = 0;
    + options->tags_ecc_overridden=1;
    + } else if (!strcmp(cur_opt, "tags-ecc-on")){
    + options->tags_ecc_on = 1;
    + options->tags_ecc_overridden = 1;
    + } else if (!strcmp(cur_opt, "lazy-loading-off")){
    + options->lazy_loading_enabled = 0;
    + options->lazy_loading_overridden=1;
    + } else if (!strcmp(cur_opt, "lazy-loading-on")){
    + options->lazy_loading_enabled = 1;
    + options->lazy_loading_overridden = 1;
    + } else if (!strcmp(cur_opt, "empty-lost-and-found-off")){
    + options->empty_lost_and_found = 0;
    + options->empty_lost_and_found_overridden=1;
    + } else if (!strcmp(cur_opt, "empty-lost-and-found-on")){
    + options->empty_lost_and_found = 1;
    + options->empty_lost_and_found_overridden=1;
    + } else if (!strcmp(cur_opt, "no-cache"))
    + options->no_cache = 1;
    + else if (!strcmp(cur_opt, "no-checkpoint-read"))
    + options->skip_checkpoint_read = 1;
    + else if (!strcmp(cur_opt, "no-checkpoint-write"))
    + options->skip_checkpoint_write = 1;
    + else if (!strcmp(cur_opt, "no-checkpoint")) {
    + options->skip_checkpoint_read = 1;
    + options->skip_checkpoint_write = 1;
    + } else {
    + printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n",
    + cur_opt);
    + error = 1;
    + }
    + }
    +
    + return error;
    +}
    +
    +static struct super_block *yaffs_internal_read_super(int yaffs_version,
    + struct super_block *sb,
    + void *data, int silent)
    +{
    + int nBlocks;
    + struct inode *inode = NULL;
    + struct dentry *root;
    + yaffs_dev_t *dev = 0;
    + char devname_buf[BDEVNAME_SIZE + 1];
    + struct mtd_info *mtd;
    + int err;
    + char *data_str = (char *)data;
    + struct yaffs_linux_context *context = NULL;
    + yaffs_param_t *param;
    +
    + int read_only = 0;
    +
    + yaffs_options options;
    +
    + unsigned mount_id;
    + int found;
    + struct yaffs_linux_context *context_iterator;
    + struct ylist_head *l;
    +
    + sb->s_magic = YAFFS_MAGIC;
    + sb->s_op = &yaffs_super_ops;
    + sb->s_flags |= MS_NOATIME;
    +
    + read_only =((sb->s_flags & MS_RDONLY) != 0);
    +
    + sb->s_export_op = &yaffs_export_ops;
    +
    + if (!sb)
    + printk(KERN_INFO "yaffs: sb is NULL\n");
    + else if (!sb->s_dev)
    + printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
    + else if (!yaffs_devname(sb, devname_buf))
    + printk(KERN_INFO "yaffs: devname is NULL\n");
    + else
    + printk(KERN_INFO "yaffs: dev is %d name is \"%s\" %s\n",
    + sb->s_dev,
    + yaffs_devname(sb, devname_buf),
    + read_only ? "ro" : "rw");
    +
    + if (!data_str)
    + data_str = "";
    +
    + printk(KERN_INFO "yaffs: passed flags \"%s\"\n", data_str);
    +
    + memset(&options, 0, sizeof(options));
    +
    + if (yaffs_parse_options(&options, data_str)) {
    + /* Option parsing failed */
    + return NULL;
    + }
    +
    +
    + sb->s_blocksize = PAGE_CACHE_SIZE;
    + sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
    +
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_read_super: Using yaffs%d\n"), yaffs_version));
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_read_super: block size %d\n"),
    + (int)(sb->s_blocksize)));
    +
    + T(YAFFS_TRACE_ALWAYS,
    + (TSTR("yaffs: Attempting MTD mount of %u.%u,\"%s\"\n"),
    + MAJOR(sb->s_dev), MINOR(sb->s_dev),
    + yaffs_devname(sb, devname_buf)));
    +
    + /* Check it's an mtd device..... */
    + if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
    + return NULL; /* This isn't an mtd device */
    +
    + /* Get the device */
    + mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
    + if (!mtd) {
    + T(YAFFS_TRACE_ALWAYS,
    + (TSTR("yaffs: MTD device #%u doesn't appear to exist\n"),
    + MINOR(sb->s_dev)));
    + return NULL;
    + }
    + /* Check it's NAND */
    + if (mtd->type != MTD_NANDFLASH) {
    + T(YAFFS_TRACE_ALWAYS,
    + (TSTR("yaffs: MTD device is not NAND it's type %d\n"),
    + mtd->type));
    + return NULL;
    + }
    +
    + T(YAFFS_TRACE_OS, (TSTR(" erase %p\n"), mtd->erase));
    + T(YAFFS_TRACE_OS, (TSTR(" read %p\n"), mtd->read));
    + T(YAFFS_TRACE_OS, (TSTR(" write %p\n"), mtd->write));
    + T(YAFFS_TRACE_OS, (TSTR(" readoob %p\n"), mtd->read_oob));
    + T(YAFFS_TRACE_OS, (TSTR(" writeoob %p\n"), mtd->write_oob));
    + T(YAFFS_TRACE_OS, (TSTR(" block_isbad %p\n"), mtd->block_isbad));
    + T(YAFFS_TRACE_OS, (TSTR(" block_markbad %p\n"), mtd->block_markbad));
    + T(YAFFS_TRACE_OS, (TSTR(" %s %d\n"), WRITE_SIZE_STR, WRITE_SIZE(mtd)));
    + T(YAFFS_TRACE_OS, (TSTR(" oobsize %d\n"), mtd->oobsize));
    + T(YAFFS_TRACE_OS, (TSTR(" erasesize %d\n"), mtd->erasesize));
    + T(YAFFS_TRACE_OS, (TSTR(" size %lld\n"), mtd->size));
    +
    +#ifdef CONFIG_YAFFS_AUTO_YAFFS2
    +
    + if (yaffs_version == 1 && WRITE_SIZE(mtd) >= 2048) {
    + T(YAFFS_TRACE_ALWAYS,
    + (TSTR("yaffs: auto selecting yaffs2\n")));
    + yaffs_version = 2;
    + }
    +
    + /* Added NCB 26/5/2006 for completeness */
    + if (yaffs_version == 2 && !options.inband_tags && WRITE_SIZE(mtd) == 512) {
    + T(YAFFS_TRACE_ALWAYS,
    + (TSTR("yaffs: auto selecting yaffs1\n")));
    + yaffs_version = 1;
    + }
    +
    +#endif
    +
    + if (yaffs_version == 2) {
    + /* Check for version 2 style functions */
    + if (!mtd->erase ||
    + !mtd->block_isbad ||
    + !mtd->block_markbad ||
    + !mtd->read ||
    + !mtd->write ||
    + !mtd->read_oob || !mtd->write_oob) {
    + T(YAFFS_TRACE_ALWAYS,
    + (TSTR("yaffs: MTD device does not support required "
    + "functions\n")));
    + return NULL;
    + }
    +
    + if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
    + mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) &&
    + !options.inband_tags) {
    + T(YAFFS_TRACE_ALWAYS,
    + (TSTR("yaffs: MTD device does not have the "
    + "right page sizes\n")));
    + return NULL;
    + }
    + } else {
    + /* Check for V1 style functions */
    + if (!mtd->erase ||
    + !mtd->read ||
    + !mtd->write ||
    + !mtd->read_oob || !mtd->write_oob) {
    + T(YAFFS_TRACE_ALWAYS,
    + (TSTR("yaffs: MTD device does not support required "
    + "functions\n")));
    + return NULL;
    + }
    +
    + if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK ||
    + mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
    + T(YAFFS_TRACE_ALWAYS,
    + (TSTR("yaffs: MTD device does not support have the "
    + "right page sizes\n")));
    + return NULL;
    + }
    + }
    +
    + /* OK, so if we got here, we have an MTD that's NAND and looks
    + * like it has the right capabilities
    + * Set the yaffs_dev_t up for mtd
    + */
    +
    + if (!read_only && !(mtd->flags & MTD_WRITEABLE)){
    + read_only = 1;
    + printk(KERN_INFO "yaffs: mtd is read only, setting superblock read only");
    + sb->s_flags |= MS_RDONLY;
    + }
    +
    + dev = kmalloc(sizeof(yaffs_dev_t), GFP_KERNEL);
    + context = kmalloc(sizeof(struct yaffs_linux_context),GFP_KERNEL);
    +
    + if(!dev || !context ){
    + if(dev)
    + kfree(dev);
    + if(context)
    + kfree(context);
    + dev = NULL;
    + context = NULL;
    + }
    +
    + if (!dev) {
    + /* Deep shit could not allocate device structure */
    + T(YAFFS_TRACE_ALWAYS,
    + (TSTR("yaffs_read_super: Failed trying to allocate "
    + "yaffs_dev_t. \n")));
    + return NULL;
    + }
    + memset(dev, 0, sizeof(yaffs_dev_t));
    + param = &(dev->param);
    +
    + memset(context,0,sizeof(struct yaffs_linux_context));
    + dev->os_context = context;
    + YINIT_LIST_HEAD(&(context->context_list));
    + context->dev = dev;
    + context->super = sb;
    +
    + dev->read_only = read_only;
    +
    + sb->s_fs_info = dev;
    +
    + dev->driver_context = mtd;
    + param->name = mtd->name;
    +
    + /* Set up the memory size parameters.... */
    +
    + nBlocks = YCALCBLOCKS(mtd->size, (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK));
    +
    + param->start_block = 0;
    + param->end_block = nBlocks - 1;
    + param->chunks_per_block = YAFFS_CHUNKS_PER_BLOCK;
    + param->total_bytes_per_chunk = YAFFS_BYTES_PER_CHUNK;
    + param->n_reserved_blocks = 5;
    + param->n_caches = (options.no_cache) ? 0 : 10;
    + param->inband_tags = options.inband_tags;
    +
    +#ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
    + param->disable_lazy_load = 1;
    +#endif
    +#ifdef CONFIG_YAFFS_XATTR
    + param->enable_xattr = 1;
    +#endif
    + if(options.lazy_loading_overridden)
    + param->disable_lazy_load = !options.lazy_loading_enabled;
    +
    +#ifdef CONFIG_YAFFS_DISABLE_TAGS_ECC
    + param->no_tags_ecc = 1;
    +#endif
    +
    +#ifdef CONFIG_YAFFS_DISABLE_BACKGROUND
    +#else
    + param->defered_dir_update = 1;
    +#endif
    +
    + if(options.tags_ecc_overridden)
    + param->no_tags_ecc = !options.tags_ecc_on;
    +
    +#ifdef CONFIG_YAFFS_EMPTY_LOST_AND_FOUND
    + param->empty_lost_n_found = 1;
    +#endif
    +
    +#ifdef CONFIG_YAFFS_DISABLE_BLOCK_REFRESHING
    + param->refresh_period = 0;
    +#else
    + param->refresh_period = 500;
    +#endif
    +
    +#ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
    + param->always_check_erased = 1;
    +#endif
    +
    + if(options.empty_lost_and_found_overridden)
    + param->empty_lost_n_found = options.empty_lost_and_found;
    +
    + /* ... and the functions. */
    + if (yaffs_version == 2) {
    + param->write_chunk_tags_fn =
    + nandmtd2_write_chunk_tags;
    + param->read_chunk_tags_fn =
    + nandmtd2_read_chunk_tags;
    + param->bad_block_fn = nandmtd2_mark_block_bad;
    + param->query_block_fn = nandmtd2_query_block;
    + yaffs_dev_to_lc(dev)->spare_buffer = YMALLOC(mtd->oobsize);
    + param->is_yaffs2 = 1;
    + param->total_bytes_per_chunk = mtd->writesize;
    + param->chunks_per_block = mtd->erasesize / mtd->writesize;
    + nBlocks = YCALCBLOCKS(mtd->size, mtd->erasesize);
    +
    + param->start_block = 0;
    + param->end_block = nBlocks - 1;
    + } else {
    + /* use the MTD interface in yaffs_mtdif1.c */
    + param->write_chunk_tags_fn =
    + nandmtd1_write_chunk_tags;
    + param->read_chunk_tags_fn =
    + nandmtd1_read_chunk_tags;
    + param->bad_block_fn = nandmtd1_mark_block_bad;
    + param->query_block_fn = nandmtd1_query_block;
    + param->is_yaffs2 = 0;
    + }
    + /* ... and common functions */
    + param->erase_fn = nandmtd_erase_block;
    + param->initialise_flash_fn = nandmtd_initialise;
    +
    + yaffs_dev_to_lc(dev)->put_super_fn = yaffs_mtd_put_super;
    +
    + param->sb_dirty_fn = yaffs_touch_super;
    + param->gc_control = yaffs_gc_control_callback;
    +
    + yaffs_dev_to_lc(dev)->super= sb;
    +
    +
    +#ifndef CONFIG_YAFFS_DOES_ECC
    + param->use_nand_ecc = 1;
    +#endif
    +
    +#ifdef CONFIG_YAFFS_DISABLE_WIDE_TNODES
    + param->wide_tnodes_disabled = 1;
    +#endif
    +
    + param->skip_checkpt_rd = options.skip_checkpoint_read;
    + param->skip_checkpt_wr = options.skip_checkpoint_write;
    +
    + down(&yaffs_context_lock);
    + /* Get a mount id */
    + found = 0;
    + for(mount_id=0; ! found; mount_id++){
    + found = 1;
    + ylist_for_each(l,&yaffs_context_list){
    + context_iterator = ylist_entry(l,struct yaffs_linux_context,context_list);
    + if(context_iterator->mount_id == mount_id)
    + found = 0;
    + }
    + }
    + context->mount_id = mount_id;
    +
    + ylist_add_tail(&(yaffs_dev_to_lc(dev)->context_list), &yaffs_context_list);
    + up(&yaffs_context_lock);
    +
    + /* Directory search handling...*/
    + YINIT_LIST_HEAD(&(yaffs_dev_to_lc(dev)->search_contexts));
    + param->remove_obj_fn = yaffs_remove_obj_callback;
    +
    + init_MUTEX(&(yaffs_dev_to_lc(dev)->gross_lock));
    +
    + yaffs_gross_lock(dev);
    +
    + err = yaffs_guts_initialise(dev);
    +
    + T(YAFFS_TRACE_OS,
    + (TSTR("yaffs_read_super: guts initialised %s\n"),
    + (err == YAFFS_OK) ? "OK" : "FAILED"));
    +
    + if(err == YAFFS_OK)
    + yaffs_bg_start(dev);
    +
    + if(!context->bg_thread)
    + param->defered_dir_update = 0;
    +
    +
    + /* Release lock before yaffs_get_inode() */
    + yaffs_gross_unlock(dev);
    +
    + /* Create root inode */
    + if (err == YAFFS_OK)
    + inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,
    + yaffs_root(dev));
    +
    + if (!inode)
    + return NULL;
    +
    + inode->i_op = &yaffs_dir_inode_operations;
    + inode->i_fop = &yaffs_dir_operations;
    +
    + T(YAFFS_TRACE_OS, (TSTR("yaffs_read_super: got root inode\n")));
    +
    + root = d_alloc_root(inode);
    +
    + T(YAFFS_TRACE_OS, (TSTR("yaffs_read_super: d_alloc_root done\n")));
    +
    + if (!root) {
    + iput(inode);
    + return NULL;
    + }
    + sb->s_root = root;
    + sb->s_dirt = !dev->is_checkpointed;
    + T(YAFFS_TRACE_ALWAYS,
    + (TSTR("yaffs_read_super: is_checkpointed %d\n"),
    + dev->is_checkpointed));
    +
    + T(YAFFS_TRACE_OS, (TSTR("yaffs_read_super: done\n")));
    + return sb;
    +}
    +
    +
    +static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
    + int silent)
    +{
    + return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
    +}
    +
    +static int yaffs_read_super(struct file_system_type *fs,
    + int flags, const char *dev_name,
    + void *data, struct vfsmount *mnt)
    +{
    +
    + return get_sb_bdev(fs, flags, dev_name, data,
    + yaffs_internal_read_super_mtd, mnt);
    +}
    +
    +static struct file_system_type yaffs_fs_type = {
    + .owner = THIS_MODULE,
    + .name = "yaffs",
    + .get_sb = yaffs_read_super,
    + .kill_sb = kill_block_super,
    + .fs_flags = FS_REQUIRES_DEV,
    +};
    +
    +
    +#ifdef CONFIG_YAFFS_YAFFS2
    +
    +static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
    + int silent)
    +{
    + return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
    +}
    +
    +static int yaffs2_read_super(struct file_system_type *fs,
    + int flags, const char *dev_name, void *data,
    + struct vfsmount *mnt)
    +{
    + return get_sb_bdev(fs, flags, dev_name, data,
    + yaffs2_internal_read_super_mtd, mnt);
    +}
    +
    +static struct file_system_type yaffs2_fs_type = {
    + .owner = THIS_MODULE,
    + .name = "yaffs2",
    + .get_sb = yaffs2_read_super,
    + .kill_sb = kill_block_super,
    + .fs_flags = FS_REQUIRES_DEV,
    +};
    +#endif /* CONFIG_YAFFS_YAFFS2 */
    +
    +static struct proc_dir_entry *my_proc_entry;
    +static struct proc_dir_entry *debug_proc_entry;
    +
    +static char *yaffs_dump_dev_part0(char *buf, yaffs_dev_t * dev)
    +{
    + buf += sprintf(buf, "start_block........... %d\n", dev->param.start_block);
    + buf += sprintf(buf, "end_block............. %d\n", dev->param.end_block);
    + buf += sprintf(buf, "total_bytes_per_chunk. %d\n", dev->param.total_bytes_per_chunk);
    + buf += sprintf(buf, "use_nand_ecc.......... %d\n", dev->param.use_nand_ecc);
    + buf += sprintf(buf, "no_tags_ecc........... %d\n", dev->param.no_tags_ecc);
    + buf += sprintf(buf, "is_yaffs2............. %d\n", dev->param.is_yaffs2);
    + buf += sprintf(buf, "inband_tags........... %d\n", dev->param.inband_tags);
    + buf += sprintf(buf, "empty_lost_n_found.... %d\n", dev->param.empty_lost_n_found);
    + buf += sprintf(buf, "disable_lazy_load..... %d\n", dev->param.disable_lazy_load);
    + buf += sprintf(buf, "refresh_period........ %d\n", dev->param.refresh_period);
    + buf += sprintf(buf, "n_caches.............. %d\n", dev->param.n_caches);
    + buf += sprintf(buf, "n_reserved_blocks..... %d\n", dev->param.n_reserved_blocks);
    + buf += sprintf(buf, "always_check_erased... %d\n", dev->param.always_check_erased);
    +
    + buf += sprintf(buf, "\n");
    +
    + return buf;
    +}
    +
    +
    +static char *yaffs_dump_dev_part1(char *buf, yaffs_dev_t * dev)
    +{
    + buf += sprintf(buf, "data_bytes_per_chunk.. %d\n", dev->data_bytes_per_chunk);
    + buf += sprintf(buf, "chunk_grp_bits........ %d\n", dev->chunk_grp_bits);
    + buf += sprintf(buf, "chunk_grp_size........ %d\n", dev->chunk_grp_size);
    + buf += sprintf(buf, "n_erased_blocks....... %d\n", dev->n_erased_blocks);
    + buf += sprintf(buf, "blocks_in_checkpt..... %d\n", dev->blocks_in_checkpt);
    + buf += sprintf(buf, "\n");
    + buf += sprintf(buf, "n_tnodes.............. %d\n", dev->n_tnodes);
    + buf += sprintf(buf, "n_obj................. %d\n", dev->n_obj);
    + buf += sprintf(buf, "n_free_chunks......... %d\n", dev->n_free_chunks);
    + buf += sprintf(buf, "\n");
    + buf += sprintf(buf, "n_page_writes......... %u\n", dev->n_page_writes);
    + buf += sprintf(buf, "n_page_reads.......... %u\n", dev->n_page_reads);
    + buf += sprintf(buf, "n_erasures............ %u\n", dev->n_erasures);
    + buf += sprintf(buf, "n_gc_copies........... %u\n", dev->n_gc_copies);
    + buf += sprintf(buf, "all_gcs............... %u\n", dev->all_gcs);
    + buf += sprintf(buf, "passive_gc_count...... %u\n", dev->passive_gc_count);
    + buf += sprintf(buf, "oldest_dirty_gc_count. %u\n", dev->oldest_dirty_gc_count);
    + buf += sprintf(buf, "n_gc_blocks........... %u\n", dev->n_gc_blocks);
    + buf += sprintf(buf, "bg_gcs................ %u\n", dev->bg_gcs);
    + buf += sprintf(buf, "n_retired_writes...... %u\n", dev->n_retired_writes);
    + buf += sprintf(buf, "n_retired_blocks...... %u\n", dev->n_retired_blocks);
    + buf += sprintf(buf, "n_ecc_fixed........... %u\n", dev->n_ecc_fixed);
    + buf += sprintf(buf, "n_ecc_unfixed......... %u\n", dev->n_ecc_unfixed);
    + buf += sprintf(buf, "n_tags_ecc_fixed...... %u\n", dev->n_tags_ecc_fixed);
    + buf += sprintf(buf, "n_tags_ecc_unfixed.... %u\n", dev->n_tags_ecc_unfixed);
    + buf += sprintf(buf, "cache_hits............ %u\n", dev->cache_hits);
    + buf += sprintf(buf, "n_deleted_files....... %u\n", dev->n_deleted_files);
    + buf += sprintf(buf, "n_unlinked_files...... %u\n", dev->n_unlinked_files);
    + buf += sprintf(buf, "refresh_count......... %u\n", dev->refresh_count);
    + buf += sprintf(buf, "n_bg_deletions........ %u\n", dev->n_bg_deletions);
    +
    + return buf;
    +}
    +
    +static int yaffs_proc_read(char *page,
    + char **start,
    + off_t offset, int count, int *eof, void *data)
    +{
    + struct ylist_head *item;
    + char *buf = page;
    + int step = offset;
    + int n = 0;
    +
    + /* Get proc_file_read() to step 'offset' by one on each sucessive call.
    + * We use 'offset' (*ppos) to indicate where we are in dev_list.
    + * This also assumes the user has posted a read buffer large
    + * enough to hold the complete output; but that's life in /proc.
    + */
    +
    + *(int *)start = 1;
    +
    + /* Print header first */
    + if (step == 0)
    + buf += sprintf(buf, "YAFFS built:" __DATE__ " " __TIME__"\n");
    + else if (step == 1)
    + buf += sprintf(buf,"\n");
    + else {
    + step-=2;
    +
    + down(&yaffs_context_lock);
    +
    + /* Locate and print the Nth entry. Order N-squared but N is small. */
    + ylist_for_each(item, &yaffs_context_list) {
    + struct yaffs_linux_context *dc = ylist_entry(item, struct yaffs_linux_context, context_list);
    + yaffs_dev_t *dev = dc->dev;
    +
    + if (n < (step & ~1)) {
    + n+=2;
    + continue;
    + }
    + if((step & 1)==0){
    + buf += sprintf(buf, "\nDevice %d \"%s\"\n", n, dev->param.name);
    + buf = yaffs_dump_dev_part0(buf, dev);
    + } else
    + buf = yaffs_dump_dev_part1(buf, dev);
    +
    + break;
    + }
    + up(&yaffs_context_lock);
    + }
    +
    + return buf - page < count ? buf - page : count;
    +}
    +
    +static int yaffs_stats_proc_read(char *page,
    + char **start,
    + off_t offset, int count, int *eof, void *data)
    +{
    + struct ylist_head *item;
    + char *buf = page;
    + int n = 0;
    +
    + down(&yaffs_context_lock);
    +
    + /* Locate and print the Nth entry. Order N-squared but N is small. */
    + ylist_for_each(item, &yaffs_context_list) {
    + struct yaffs_linux_context *dc = ylist_entry(item, struct yaffs_linux_context, context_list);
    + yaffs_dev_t *dev = dc->dev;
    +
    + int erased_chunks;
    +
    + erased_chunks = dev->n_erased_blocks * dev->param.chunks_per_block;
    +
    + buf += sprintf(buf,"%d, %d, %d, %u, %u, %u, %u\n",
    + n, dev->n_free_chunks, erased_chunks,
    + dev->bg_gcs, dev->oldest_dirty_gc_count,
    + dev->n_obj, dev->n_tnodes);
    + }
    + up(&yaffs_context_lock);
    +
    +
    + return buf - page < count ? buf - page : count;
    +}
    +
    +/**
    + * Set the verbosity of the warnings and error messages.
    + *
    + * Note that the names can only be a..z or _ with the current code.
    + */
    +
    +static struct {
    + char *mask_name;
    + unsigned mask_bitfield;
    +} mask_flags[] = {
    + {"allocate", YAFFS_TRACE_ALLOCATE},
    + {"always", YAFFS_TRACE_ALWAYS},
    + {"background", YAFFS_TRACE_BACKGROUND},
    + {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
    + {"buffers", YAFFS_TRACE_BUFFERS},
    + {"bug", YAFFS_TRACE_BUG},
    + {"checkpt", YAFFS_TRACE_CHECKPOINT},
    + {"deletion", YAFFS_TRACE_DELETION},
    + {"erase", YAFFS_TRACE_ERASE},
    + {"error", YAFFS_TRACE_ERROR},
    + {"gc_detail", YAFFS_TRACE_GC_DETAIL},
    + {"gc", YAFFS_TRACE_GC},
    + {"lock", YAFFS_TRACE_LOCK},
    + {"mtd", YAFFS_TRACE_MTD},
    + {"nandaccess", YAFFS_TRACE_NANDACCESS},
    + {"os", YAFFS_TRACE_OS},
    + {"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
    + {"scan", YAFFS_TRACE_SCAN},
    + {"tracing", YAFFS_TRACE_TRACING},
    + {"sync", YAFFS_TRACE_SYNC},
    + {"write", YAFFS_TRACE_WRITE},
    +
    + {"verify", YAFFS_TRACE_VERIFY},
    + {"verify_nand", YAFFS_TRACE_VERIFY_NAND},
    + {"verify_full", YAFFS_TRACE_VERIFY_FULL},
    + {"verify_all", YAFFS_TRACE_VERIFY_ALL},
    +
    + {"all", 0xffffffff},
    + {"none", 0},
    + {NULL, 0},
    +};
    +
    +#define MAX_MASK_NAME_LENGTH 40
    +static int yaffs_proc_write_trace_options(struct file *file, const char *buf,
    + unsigned long count, void *data)
    +{
    + unsigned rg = 0, mask_bitfield;
    + char *end;
    + char *mask_name;
    + const char *x;
    + char substring[MAX_MASK_NAME_LENGTH + 1];
    + int i;
    + int done = 0;
    + int add, len = 0;
    + int pos = 0;
    +
    + rg = yaffs_trace_mask;
    +
    + while (!done && (pos < count)) {
    + done = 1;
    + while ((pos < count) && isspace(buf[pos]))
    + pos++;
    +
    + switch (buf[pos]) {
    + case '+':
    + case '-':
    + case '=':
    + add = buf[pos];
    + pos++;
    + break;
    +
    + default:
    + add = ' ';
    + break;
    + }
    + mask_name = NULL;
    +
    + mask_bitfield = simple_strtoul(buf + pos, &end, 0);
    +
    + if (end > buf + pos) {
    + mask_name = "numeral";
    + len = end - (buf + pos);
    + pos += len;
    + done = 0;
    + } else {
    + for (x = buf + pos, i = 0;
    + (*x == '_' || (*x >= 'a' && *x <= 'z')) &&
    + i < MAX_MASK_NAME_LENGTH; x++, i++, pos++)
    + substring[i] = *x;
    + substring[i] = '\0';
    +
    + for (i = 0; mask_flags[i].mask_name != NULL; i++) {
    + if (strcmp(substring, mask_flags[i].mask_name) == 0) {
    + mask_name = mask_flags[i].mask_name;
    + mask_bitfield = mask_flags[i].mask_bitfield;
    + done = 0;
    + break;
    + }
    + }
    + }
    +
    + if (mask_name != NULL) {
    + done = 0;
    + switch (add) {
    + case '-':
    + rg &= ~mask_bitfield;
    + break;
    + case '+':
    + rg |= mask_bitfield;
    + break;
    + case '=':
    + rg = mask_bitfield;
    + break;
    + default:
    + rg |= mask_bitfield;
    + break;
    + }
    + }
    + }
    +
    + yaffs_trace_mask = rg | YAFFS_TRACE_ALWAYS;
    +
    + printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_trace_mask);
    +
    + if (rg & YAFFS_TRACE_ALWAYS) {
    + for (i = 0; mask_flags[i].mask_name != NULL; i++) {
    + char flag;
    + flag = ((rg & mask_flags[i].mask_bitfield) ==
    + mask_flags[i].mask_bitfield) ? '+' : '-';
    + printk(KERN_DEBUG "%c%s\n", flag, mask_flags[i].mask_name);
    + }
    + }
    +
    + return count;
    +}
    +
    +
    +static int yaffs_proc_write(struct file *file, const char *buf,
    + unsigned long count, void *data)
    +{
    + return yaffs_proc_write_trace_options(file, buf, count, data);
    +}
    +
    +/* Stuff to handle installation of file systems */
    +struct file_system_to_install {
    + struct file_system_type *fst;
    + int installed;
    +};
    +
    +static struct file_system_to_install fs_to_install[] = {
    + {&yaffs_fs_type, 0},
    + {&yaffs2_fs_type, 0},
    + {NULL, 0}
    +};
    +
    +static int __init init_yaffs_fs(void)
    +{
    + int error = 0;
    + struct file_system_to_install *fsinst;
    +
    + T(YAFFS_TRACE_ALWAYS,
    + (TSTR("yaffs built " __DATE__ " " __TIME__ " Installing. \n")));
    +
    +#ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
    + T(YAFFS_TRACE_ALWAYS,
    + (TSTR(" \n\n\n\nYAFFS-WARNING CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED selected.\n\n\n\n")));
    +#endif
    +
    +
    +
    +
    + init_MUTEX(&yaffs_context_lock);
    +
    + /* Install the proc_fs entries */
    + my_proc_entry = create_proc_entry("yaffs",
    + S_IRUGO | S_IFREG,
    + YPROC_ROOT);
    +
    + if (my_proc_entry) {
    + my_proc_entry->write_proc = yaffs_proc_write;
    + my_proc_entry->read_proc = yaffs_proc_read;
    + my_proc_entry->data = NULL;
    + } else
    + return -ENOMEM;
    +
    + debug_proc_entry = create_proc_entry("yaffs_stats",
    + S_IRUGO | S_IFREG,
    + YPROC_ROOT);
    +
    + if (debug_proc_entry) {
    + debug_proc_entry->write_proc = NULL;
    + debug_proc_entry->read_proc = yaffs_stats_proc_read;
    + debug_proc_entry->data = NULL;
    + } else
    + return -ENOMEM;
    +
    + /* Now add the file system entries */
    +
    + fsinst = fs_to_install;
    +
    + while (fsinst->fst && !error) {
    + error = register_filesystem(fsinst->fst);
    + if (!error)
    + fsinst->installed = 1;
    + fsinst++;
    + }
    +
    + /* Any errors? uninstall */
    + if (error) {
    + fsinst = fs_to_install;
    +
    + while (fsinst->fst) {
    + if (fsinst->installed) {
    + unregister_filesystem(fsinst->fst);
    + fsinst->installed = 0;
    + }
    + fsinst++;
    + }
    + }
    +
    + return error;
    +}
    +
    +static void __exit exit_yaffs_fs(void)
    +{
    +
    + struct file_system_to_install *fsinst;
    +
    + T(YAFFS_TRACE_ALWAYS,
    + (TSTR("yaffs built " __DATE__ " " __TIME__ " removing. \n")));
    +
    + remove_proc_entry("yaffs", YPROC_ROOT);
    + remove_proc_entry("yaffs_stats", YPROC_ROOT);
    +
    + fsinst = fs_to_install;
    +
    + while (fsinst->fst) {
    + if (fsinst->installed) {
    + unregister_filesystem(fsinst->fst);
    + fsinst->installed = 0;
    + }
    + fsinst++;
    + }
    +}
    +
    +module_init(init_yaffs_fs)
    +module_exit(exit_yaffs_fs)
    +
    +MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
    +MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2010");
    +MODULE_LICENSE("GPL");
    --
    1.7.3.2.146.gca209


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