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gfiber / kernel / windcharger / refs/heads/master / . / fs / yaffs2 / yaffs_vfs_glue.c
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/*
* 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.
*/
/*
* There are two variants of the VFS glue code. This variant should compile
* for any version of Linux.
*/
#include <linux/version.h>
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 10))
#define YAFFS_COMPILE_BACKGROUND
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6, 23))
#define YAFFS_COMPILE_FREEZER
#endif
#endif
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,28))
#define YAFFS_COMPILE_EXPORTFS
#endif
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,35))
#define YAFFS_USE_SETATTR_COPY
#define YAFFS_USE_TRUNCATE_SETSIZE
#endif
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,35))
#define YAFFS_HAS_EVICT_INODE
#endif
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
#define YAFFS_NEW_FOLLOW_LINK 1
#else
#define YAFFS_NEW_FOLLOW_LINK 0
#endif
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
#include <linux/config.h>
#endif
#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/mutex.h>
#include <linux/pagemap.h>
#include <linux/mtd/mtd.h>
#include <linux/interrupt.h>
#include <linux/string.h>
#include <linux/ctype.h>
#if (YAFFS_NEW_FOLLOW_LINK == 1)
#include <linux/namei.h>
#endif
#ifdef YAFFS_COMPILE_EXPORTFS
#include <linux/exportfs.h>
#endif
#ifdef YAFFS_COMPILE_BACKGROUND
#include <linux/kthread.h>
#include <linux/delay.h>
#endif
#ifdef YAFFS_COMPILE_FREEZER
#include <linux/freezer.h>
#endif
#include <asm/div64.h>
static DEFINE_MUTEX(yaffs_mutex);
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
#include <linux/statfs.h>
#define UnlockPage(p) unlock_page(p)
#define Page_Uptodate(page) test_bit(PG_uptodate, &(page)->flags)
/* FIXME: use sb->s_id instead ? */
#define yaffs_devname(sb, buf) bdevname(sb->s_bdev, buf)
#else
#include <linux/locks.h>
#define BDEVNAME_SIZE 0
#define yaffs_devname(sb, buf) kdevname(sb->s_dev)
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0))
/* added NCB 26/5/2006 for 2.4.25-vrs2-tcl1 kernel */
#define __user
#endif
#endif
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26))
#define YPROC_ROOT (&proc_root)
#else
#define YPROC_ROOT NULL
#endif
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,26))
#define Y_INIT_TIMER(a) init_timer(a)
#else
#define Y_INIT_TIMER(a) init_timer_on_stack(a)
#endif
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
#define WRITE_SIZE_STR "writesize"
#define WRITE_SIZE(mtd) ((mtd)->writesize)
#else
#define WRITE_SIZE_STR "oobblock"
#define WRITE_SIZE(mtd) ((mtd)->oobblock)
#endif
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 27))
#define YAFFS_USE_WRITE_BEGIN_END 1
#else
#define YAFFS_USE_WRITE_BEGIN_END 0
#endif
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 28))
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;
}
#else
#define YCALCBLOCKS(s, b) ((s)/(b))
#endif
#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 */
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
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);
#else
MODULE_PARM(yaffs_trace_mask, "i");
MODULE_PARM(yaffs_wr_attempts, "i");
MODULE_PARM(yaffs_auto_checkpoint, "i");
MODULE_PARM(yaffs_gc_control, "i");
#endif
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25))
/* use iget and read_inode */
#define Y_IGET(sb, inum) iget((sb), (inum))
static void yaffs_read_inode(struct inode *inode);
#else
/* Call local equivalent */
#define YAFFS_USE_OWN_IGET
#define Y_IGET(sb, inum) yaffs_iget((sb), (inum))
static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino);
#endif
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
#define yaffs_InodeToObjectLV(iptr) ((iptr)->i_private)
#else
#define yaffs_InodeToObjectLV(iptr) ((iptr)->u.generic_ip)
#endif
#define yaffs_InodeToObject(iptr) ((yaffs_obj_t *)(yaffs_InodeToObjectLV(iptr)))
#define yaffs_dentry_to_obj(dptr) yaffs_InodeToObject((dptr)->d_inode)
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
#define yaffs_SuperToDevice(sb) ((yaffs_dev_t *)sb->s_fs_info)
#else
#define yaffs_SuperToDevice(sb) ((yaffs_dev_t *)sb->u.generic_sbp)
#endif
#if (LINUX_VERSION_CODE > KERNEL_VERSION(3, 2, 0))
static inline void yaffs_set_nlink(struct inode *inode, unsigned int nlink)
{
set_nlink(inode, nlink);
}
static inline void yaffs_dec_link_count(struct inode *inode)
{
inode_dec_link_count(inode);
}
#else
static inline void yaffs_set_nlink(struct inode *inode, unsigned int nlink)
{
inode->i_nlink = nlink;
}
static inline void yaffs_dec_link_count(struct inode *inode)
{
inode->i_nlink--;
mark_inode_dirty(inode)
}
#endif
#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);
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
static int yaffs_file_flush(struct file *file, fl_owner_t id);
#else
static int yaffs_file_flush(struct file *file);
#endif
#if (LINUX_VERSION_CODE > KERNEL_VERSION(3, 2, 0))
static int yaffs_sync_object(struct file *file, loff_t start, loff_t end,
int datasync);
#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34))
static int yaffs_sync_object(struct file *file, int datasync);
#else
static int yaffs_sync_object(struct file *file, struct dentry *dentry,
int datasync);
#endif
static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 3, 0))
static int yaffs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
struct nameidata *n);
#else
static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
struct nameidata *n);
#endif
static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
struct nameidata *n);
#else
static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode);
static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry);
#endif
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);
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 3, 0))
static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode);
#else
static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
#endif
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 3, 0))
static int yaffs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
dev_t dev);
#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
dev_t dev);
#else
static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
int dev);
#endif
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);
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
static int yaffs_sync_fs(struct super_block *sb, int wait);
static void yaffs_write_super(struct super_block *sb);
#else
static int yaffs_sync_fs(struct super_block *sb);
static int yaffs_write_super(struct super_block *sb);
#endif
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf);
#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf);
#else
static int yaffs_statfs(struct super_block *sb, struct statfs *buf);
#endif
#ifdef YAFFS_HAS_PUT_INODE
static void yaffs_put_inode(struct inode *inode);
#endif
#ifdef YAFFS_HAS_EVICT_INODE
static void yaffs_evict_inode(struct inode *);
#else
static void yaffs_delete_inode(struct inode *);
static void yaffs_clear_inode(struct inode *);
#endif
static int yaffs_readpage(struct file *file, struct page *page);
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
static int yaffs_writepage(struct page *page, struct writeback_control *wbc);
#else
static int yaffs_writepage(struct page *page);
#endif
#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
#if (YAFFS_USE_WRITE_BEGIN_END != 0)
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);
#else
static int yaffs_prepare_write(struct file *f, struct page *pg,
unsigned offset, unsigned to);
static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
unsigned to);
#endif
static int yaffs_readlink(struct dentry *dentry, char __user *buffer,
int buflen);
#if (YAFFS_NEW_FOLLOW_LINK == 1)
void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias);
static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
#else
static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
#endif
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,
#if (YAFFS_USE_WRITE_BEGIN_END > 0)
.write_begin = yaffs_write_begin,
.write_end = yaffs_write_end,
#else
.prepare_write = yaffs_prepare_write,
.commit_write = yaffs_commit_write,
#endif
};
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 22))
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,
};
#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
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,
.sendfile = generic_file_sendfile,
};
#else
static const struct file_operations yaffs_file_operations = {
.read = generic_file_read,
.write = generic_file_write,
.mmap = generic_file_mmap,
.flush = yaffs_file_flush,
.fsync = yaffs_sync_object,
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
.sendfile = generic_file_sendfile,
#endif
};
#endif
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25))
static void zero_user_segment(struct page *page, unsigned start, unsigned end)
{
void * kaddr = kmap_atomic(page, KM_USER0);
memset(kaddr + start, 0, end - start);
kunmap_atomic(kaddr, KM_USER0);
flush_dcache_page(page);
}
#endif
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,
#if (YAFFS_NEW_FOLLOW_LINK == 1)
.put_link = yaffs_put_link,
#endif
.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,
#ifndef YAFFS_USE_OWN_IGET
.read_inode = yaffs_read_inode,
#endif
#ifdef YAFFS_HAS_PUT_INODE
.put_inode = yaffs_put_inode,
#endif
.put_super = yaffs_put_super,
#ifdef YAFFS_HAS_EVICT_INODE
.evict_inode = yaffs_evict_inode,
#else
.delete_inode = yaffs_delete_inode,
.clear_inode = yaffs_clear_inode,
#endif
.sync_fs = yaffs_sync_fs,
.write_super = yaffs_write_super,
};
static int yaffs_vfs_setattr(struct inode *inode, struct iattr *attr)
{
#ifdef YAFFS_USE_SETATTR_COPY
setattr_copy(inode,attr);
return 0;
#else
return inode_setattr(inode, attr);
#endif
}
static int yaffs_vfs_setsize(struct inode *inode, loff_t newsize)
{
#ifdef YAFFS_USE_TRUNCATE_SETSIZE
truncate_setsize(inode,newsize);
return 0;
#else
truncate_inode_pages(&inode->i_data,newsize);
return 0;
#endif
}
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)->grossLock));
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)->grossLock));
}
#ifdef YAFFS_COMPILE_EXPORTFS
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_InodeToObject(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,
} ;
#endif
/*-----------------------------------------------------------------*/
/* 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_SearchContext {
yaffs_dev_t *dev;
yaffs_obj_t *dirObj;
yaffs_obj_t *nextReturn;
struct ylist_head others;
};
/*
* yaffs_NewSearch() 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_SearchContext * yaffs_NewSearch(yaffs_obj_t *dir)
{
yaffs_dev_t *dev = dir->my_dev;
struct yaffs_SearchContext *sc = YMALLOC(sizeof(struct yaffs_SearchContext));
if(sc){
sc->dirObj = dir;
sc->dev = dev;
if( ylist_empty(&sc->dirObj->variant.dir_variant.children))
sc->nextReturn = NULL;
else
sc->nextReturn = 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)->searchContexts));
}
return sc;
}
/*
* yaffs_search_end() disposes of a search context and cleans up.
*/
static void yaffs_search_end(struct yaffs_SearchContext * 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_SearchContext *sc)
{
if(!sc)
return;
if( sc->nextReturn == NULL ||
ylist_empty(&sc->dirObj->variant.dir_variant.children))
sc->nextReturn = NULL;
else {
struct ylist_head *next = sc->nextReturn->siblings.next;
if( next == &sc->dirObj->variant.dir_variant.children)
sc->nextReturn = NULL; /* end of list */
else
sc->nextReturn = 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_SearchContext *sc;
struct ylist_head *search_contexts = &(yaffs_dev_to_lc(obj->my_dev)->searchContexts);
/* 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_SearchContext,others);
if(sc->nextReturn == 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;
}
#if (YAFFS_NEW_FOLLOW_LINK == 1)
static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
#else
static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
#endif
{
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) {
ret = -ENOMEM;
goto out;
}
#if (YAFFS_NEW_FOLLOW_LINK == 1)
nd_set_link(nd, alias);
ret = (int)alias;
out:
return ERR_PTR(ret);
#else
ret = vfs_follow_link(nd, alias);
kfree(alias);
out:
return ret;
#endif
}
#if (YAFFS_NEW_FOLLOW_LINK == 1)
void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias) {
kfree(alias);
}
#endif
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
*/
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
struct nameidata *n)
#else
static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry)
#endif
{
yaffs_obj_t *obj;
struct inode *inode = NULL; /* NCB 2.5/2.6 needs NULL here */
yaffs_dev_t *dev = yaffs_InodeToObject(dir)->my_dev;
if(current != yaffs_dev_to_lc(dev)->readdirProcess)
yaffs_gross_lock(dev);
T(YAFFS_TRACE_OS,
(TSTR("yaffs_lookup for %d:%s\n"),
yaffs_InodeToObject(dir)->obj_id, dentry->d_name.name));
obj = yaffs_find_by_name(yaffs_InodeToObject(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)->readdirProcess)
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_InodeToObjectLV(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);
}
#ifdef YAFFS_HAS_EVICT_INODE
/* 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_InodeToObject(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);
}
}
#else
/* clear is called to tell the fs to release any per-inode data it holds.
* The object might still exist on disk and is just being thrown out of the cache
* or else the object has actually been deleted and we're being called via
* the chain
* yaffs_delete_inode() -> clear_inode()->yaffs_clear_inode()
*/
static void yaffs_clear_inode(struct inode *inode)
{
yaffs_obj_t *obj;
yaffs_dev_t *dev;
obj = yaffs_InodeToObject(inode);
T(YAFFS_TRACE_OS,
(TSTR("yaffs_clear_inode: ino %d, count %d %s\n"), (int)inode->i_ino,
atomic_read(&inode->i_count),
obj ? "object exists" : "null object"));
if (obj) {
dev = obj->my_dev;
yaffs_gross_lock(dev);
yaffs_unstitch_obj(inode,obj);
yaffs_gross_unlock(dev);
}
}
/* delete is called when the link count is zero and the inode
* is put (ie. nobody wants to know about it anymore, time to
* delete the file).
* NB Must call clear_inode()
*/
static void yaffs_delete_inode(struct inode *inode)
{
yaffs_obj_t *obj = yaffs_InodeToObject(inode);
yaffs_dev_t *dev;
T(YAFFS_TRACE_OS,
(TSTR("yaffs_delete_inode: ino %d, count %d %s\n"), (int)inode->i_ino,
atomic_read(&inode->i_count),
obj ? "object exists" : "null object"));
if (obj) {
dev = obj->my_dev;
yaffs_gross_lock(dev);
yaffs_del_obj(obj);
yaffs_gross_unlock(dev);
}
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
truncate_inode_pages(&inode->i_data, 0);
#endif
clear_inode(inode);
}
#endif
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
static int yaffs_file_flush(struct file *file, fl_owner_t id)
#else
static int yaffs_file_flush(struct file *file)
#endif
{
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;
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
BUG_ON(!PageLocked(pg));
#else
if (!PageLocked(pg))
PAGE_BUG(pg);
#endif
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 */
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
#else
static int yaffs_writepage(struct page *page)
#endif
{
yaffs_dev_t *dev;
struct address_space *mapping = page->mapping;
struct inode *inode;
unsigned long end_index;
char *buffer;
yaffs_obj_t *obj;
int nWritten = 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_InodeToObject(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));
nWritten = 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 (nWritten == n_bytes) ? 0 : -ENOSPC;
}
#if (YAFFS_USE_WRITE_BEGIN_END > 0)
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 */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 28)
pg = grab_cache_page_write_begin(mapping, index, flags);
#else
pg = __grab_cache_page(mapping, index);
#endif
*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;
}
#else
static int yaffs_prepare_write(struct file *f, struct page *pg,
unsigned offset, unsigned to)
{
T(YAFFS_TRACE_OS, (TSTR("yaffs_prepair_write\n")));
if (!Page_Uptodate(pg))
return yaffs_readpage_nolock(f, pg);
return 0;
}
#endif
#if (YAFFS_USE_WRITE_BEGIN_END > 0)
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;
}
#else
static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
unsigned to)
{
void *addr, *kva;
loff_t pos = (((loff_t) pg->index) << PAGE_CACHE_SHIFT) + offset;
int n_bytes = to - offset;
int nWritten;
unsigned spos = pos;
unsigned saddr;
kva = kmap(pg);
addr = kva + offset;
saddr = (unsigned) addr;
T(YAFFS_TRACE_OS,
(TSTR("yaffs_commit_write addr %x pos %x n_bytes %d\n"),
saddr, spos, n_bytes));
nWritten = yaffs_file_write(f, addr, n_bytes, &pos);
if (nWritten != n_bytes) {
T(YAFFS_TRACE_OS,
(TSTR("yaffs_commit_write not same size nWritten %d n_bytes %d\n"),
nWritten, n_bytes));
SetPageError(pg);
} else {
/* Nothing */
}
kunmap(pg);
T(YAFFS_TRACE_OS,
(TSTR("yaffs_commit_write returning %d\n"),
nWritten == n_bytes ? 0 : nWritten));
return nWritten == n_bytes ? 0 : nWritten;
}
#endif
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;
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
inode->i_blksize = inode->i_sb->s_blocksize;
#endif
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
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;
#else
inode->i_rdev = obj->yst_rdev;
inode->i_atime = obj->yst_atime;
inode->i_mtime = obj->yst_mtime;
inode->i_ctime = obj->yst_ctime;
#endif
inode->i_size = yaffs_get_obj_length(obj);
inode->i_blocks = (inode->i_size + 511) >> 9;
yaffs_set_nlink(inode, 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 */
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
init_special_inode(inode, obj->yst_mode,
old_decode_dev(obj->yst_rdev));
#else
init_special_inode(inode, obj->yst_mode,
(dev_t) (obj->yst_rdev));
#endif
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_InodeToObjectLV(inode) = obj;
obj->my_inode = inode;
} else {
T(YAFFS_TRACE_OS,
(TSTR("yaffs_FileInode 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 grossLock 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 nWritten, 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));
nWritten = 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 (nWritten > 0) {
ipos += nWritten;
*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 (nWritten == 0) && (n > 0) ? -ENOSPC : nWritten;
}
/* 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;
mutex_lock(&yaffs_mutex);
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;
}
mutex_unlock(&yaffs_mutex);
return retval;
}
static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
{
yaffs_obj_t *obj;
yaffs_dev_t *dev;
struct yaffs_SearchContext *sc;
struct inode *inode = f->f_dentry->d_inode;
unsigned long offset, curoffs;
yaffs_obj_t *l;
int retVal = 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)->readdirProcess = current;
offset = f->f_pos;
sc = yaffs_NewSearch(obj);
if(!sc){
retVal = -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->nextReturn){
curoffs++;
l = sc->nextReturn;
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)->readdirProcess = NULL;
yaffs_gross_unlock(dev);
return retVal;
}
/*
* File creation. Allocate an inode, and we're done..
*/
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
#define YCRED(x) x
#else
#define YCRED(x) (x->cred)
#endif
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 3, 0))
static int yaffs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
dev_t rdev)
#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
dev_t rdev)
#else
static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
int rdev)
#endif
{
struct inode *inode;
yaffs_obj_t *obj = NULL;
yaffs_dev_t *dev;
yaffs_obj_t *parent = yaffs_InodeToObject(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")));
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
obj = yaffs_create_special(parent, dentry->d_name.name, mode, uid,
gid, old_encode_dev(rdev));
#else
obj = yaffs_create_special(parent, dentry->d_name.name, mode, uid,
gid, rdev);
#endif
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;
}
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 3, 0))
static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
#else
static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
#endif
{
int retVal;
T(YAFFS_TRACE_OS, (TSTR("yaffs_mkdir\n")));
retVal = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
return retVal;
}
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 3, 0))
static int yaffs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
struct nameidata *n)
#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
struct nameidata *n)
#else
static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
#endif
{
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 retVal;
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_InodeToObject(dir);
dev = obj->my_dev;
yaffs_gross_lock(dev);
retVal = yaffs_unlinker(obj, dentry->d_name.name);
if (retVal == YAFFS_OK) {
yaffs_dec_link_count(dentry->d_inode);
dir->i_version++;
yaffs_gross_unlock(dev);
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_InodeToObject(inode);
dev = obj->my_dev;
yaffs_gross_lock(dev);
if (!S_ISDIR(inode->i_mode)) /* Don't link directories */
link = yaffs_link_obj(yaffs_InodeToObject(dir), dentry->d_name.name,
obj);
if (link) {
yaffs_set_nlink(old_dentry->d_inode,
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_InodeToObject(dir)->my_dev;
yaffs_gross_lock(dev);
obj = yaffs_create_symlink(yaffs_InodeToObject(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;
}
#if (LINUX_VERSION_CODE > KERNEL_VERSION(3, 2, 0))
static int yaffs_sync_object(struct file *file, loff_t start, loff_t end,
int datasync)
#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34))
static int yaffs_sync_object(struct file *file, int datasync)
#else
static int yaffs_sync_object(struct file *file, struct dentry *dentry,
int datasync)
#endif
{
yaffs_obj_t *obj;
yaffs_dev_t *dev;
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34))
struct dentry *dentry = file->f_path.dentry;
#endif
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 retVal = YAFFS_FAIL;
yaffs_obj_t *target;
T(YAFFS_TRACE_OS, (TSTR("yaffs_rename\n")));
dev = yaffs_InodeToObject(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_InodeToObject(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")));
retVal = YAFFS_FAIL;
} else {
/* Now does unlinking internally using shadowing mechanism */
T(YAFFS_TRACE_OS, (TSTR("calling yaffs_rename_obj\n")));
retVal = yaffs_rename_obj(yaffs_InodeToObject(old_dir),
old_dentry->d_name.name,
yaffs_InodeToObject(new_dir),
new_dentry->d_name.name);
}
yaffs_gross_unlock(dev);
if (retVal == YAFFS_OK) {
if (target)
yaffs_dec_link_count(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_InodeToObject(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_InodeToObject(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_InodeToObject(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_InodeToObject(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_InodeToObject(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_InodeToObject(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_InodeToObject(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
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
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;
#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
{
yaffs_dev_t *dev = yaffs_SuperToDevice(sb);
#else
static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
{
yaffs_dev_t *dev = yaffs_SuperToDevice(sb);
#endif
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 bytesInDev;
uint64_t bytesFree;
bytesInDev = ((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(bytesInDev, sb->s_blocksize); /* bytesInDev becomes the number of blocks */
buf->f_blocks = bytesInDev;
bytesFree = ((uint64_t)(yaffs_get_n_free_chunks(dev))) *
((uint64_t)(dev->data_bytes_per_chunk));
do_div(bytesFree, sb->s_blocksize);
buf->f_bfree = bytesFree;
} 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_InodeToObject(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_SuperToDevice(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 erasedChunks = dev->n_erased_blocks * dev->param.chunks_per_block;
struct yaffs_LinuxContext *context = yaffs_dev_to_lc(dev);
unsigned scatteredFree = 0; /* Free chunks not in an erased block */
if(erasedChunks < dev->n_free_chunks)
scatteredFree = (dev->n_free_chunks - erasedChunks);
if(!context->bgRunning)
return 0;
else if(scatteredFree < (dev->param.chunks_per_block * 2))
return 0;
else if(erasedChunks > dev->n_free_chunks/2)
return 0;
else if(erasedChunks > 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_SuperToDevice(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.
*/
#ifdef YAFFS_COMPILE_BACKGROUND
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_LinuxContext *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 gcResult;
struct timer_list timer;
T(YAFFS_TRACE_BACKGROUND,
(TSTR("yaffs_background starting for dev %p\n"),
(void *)dev));
#ifdef YAFFS_COMPILE_FREEZER
set_freezable();
#endif
while(context->bgRunning){
T(YAFFS_TRACE_BACKGROUND,
(TSTR("yaffs_background\n")));
if(kthread_should_stop())
break;
#ifdef YAFFS_COMPILE_FREEZER
if(try_to_freeze())
continue;
#endif
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);
gcResult = 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);
#if 1
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);
#else
msleep(10);
#endif
}
return 0;
}
static int yaffs_bg_start(yaffs_dev_t *dev)
{
int retval = 0;
struct yaffs_LinuxContext *context = yaffs_dev_to_lc(dev);
if(dev->read_only)
return -1;
context->bgRunning = 1;
context->bgThread = kthread_run(yaffs_bg_thread_fn,
(void *)dev,"yaffs-bg-%d",context->mount_id);
if(IS_ERR(context->bgThread)){
retval = PTR_ERR(context->bgThread);
context->bgThread = NULL;
context->bgRunning = 0;
}
return retval;
}
static void yaffs_bg_stop(yaffs_dev_t *dev)
{
struct yaffs_LinuxContext *ctxt = yaffs_dev_to_lc(dev);
ctxt->bgRunning = 0;
if( ctxt->bgThread){
kthread_stop(ctxt->bgThread);
ctxt->bgThread = NULL;
}
}
#else
static int yaffs_bg_thread_fn(void *data)
{
return 0;
}
static int yaffs_bg_start(yaffs_dev_t *dev)
{
return 0;
}
static void yaffs_bg_stop(yaffs_dev_t *dev)
{
}
#endif
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
static void yaffs_write_super(struct super_block *sb)
#else
static int yaffs_write_super(struct super_block *sb)
#endif
{
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);
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 18))
return 0;
#endif
}
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
static int yaffs_sync_fs(struct super_block *sb, int wait)
#else
static int yaffs_sync_fs(struct super_block *sb)
#endif
{
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;
}
#ifdef YAFFS_USE_OWN_IGET
static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino)
{
struct inode *inode;
yaffs_obj_t *obj;
yaffs_dev_t *dev = yaffs_SuperToDevice(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;
}
#else
static void yaffs_read_inode(struct inode *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_obj_t *obj;
yaffs_dev_t *dev = yaffs_SuperToDevice(inode->i_sb);
T(YAFFS_TRACE_OS,
(TSTR("yaffs_read_inode for %d\n"), (int)inode->i_ino));
if(current != yaffs_dev_to_lc(dev)->readdirProcess)
yaffs_gross_lock(dev);
obj = yaffs_find_by_number(dev, inode->i_ino);
yaffs_fill_inode_from_obj(inode, obj);
if(current != yaffs_dev_to_lc(dev)->readdirProcess)
yaffs_gross_unlock(dev);
}
#endif
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_SuperToDevice(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)->putSuperFunc)
yaffs_dev_to_lc(dev)->putSuperFunc(sb);
yaffs_deinitialise(dev);
yaffs_gross_unlock(dev);
down(&yaffs_context_lock);
ylist_del_init(&(yaffs_dev_to_lc(dev)->contextList));
up(&yaffs_context_lock);
if (yaffs_dev_to_lc(dev)->spareBuffer) {
YFREE(yaffs_dev_to_lc(dev)->spareBuffer);
yaffs_dev_to_lc(dev)->spareBuffer = NULL;
}
kfree(dev);
}
static void yaffs_MTDPutSuper(struct super_block *sb)
{
struct mtd_info *mtd = yaffs_dev_to_mtd(yaffs_SuperToDevice(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)->superBlock;
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_LinuxContext *context = NULL;
yaffs_param_t *param;
int read_only = 0;
yaffs_options options;
unsigned mount_id;
int found;
struct yaffs_LinuxContext *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);
#ifdef YAFFS_COMPILE_EXPORTFS
sb->s_export_op = &yaffs_export_ops;
#endif
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));
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
T(YAFFS_TRACE_OS, (TSTR(" size %u\n"), mtd->size));
#else
T(YAFFS_TRACE_OS, (TSTR(" size %lld\n"), mtd->size));
#endif
#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 ||
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
!mtd->read_oob || !mtd->write_oob) {
#else
!mtd->write_ecc ||
!mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
#endif
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 ||
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
!mtd->read_oob || !mtd->write_oob) {
#else
!mtd->write_ecc ||
!mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
#endif
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_LinuxContext),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_LinuxContext));
dev->os_context = context;
YINIT_LIST_HEAD(&(context->contextList));
context->dev = dev;
context->superBlock = sb;
dev->read_only = read_only;
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
sb->s_fs_info = dev;
#else
sb->u.generic_sbp = dev;
#endif
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_WriteChunkWithTagsToNAND;
param->read_chunk_tags_fn =
nandmtd2_ReadChunkWithTagsFromNAND;
param->bad_block_fn = nandmtd2_MarkNANDBlockBad;
param->query_block_fn = nandmtd2_QueryNANDBlock;
yaffs_dev_to_lc(dev)->spareBuffer = YMALLOC(mtd->oobsize);
param->is_yaffs2 = 1;
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
param->total_bytes_per_chunk = mtd->writesize;
param->chunks_per_block = mtd->erasesize / mtd->writesize;
#else
param->total_bytes_per_chunk = mtd->oobblock;
param->chunks_per_block = mtd->erasesize / mtd->oobblock;
#endif
nBlocks = YCALCBLOCKS(mtd->size, mtd->erasesize);
param->start_block = 0;
param->end_block = nBlocks - 1;
} else {
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
/* use the MTD interface in yaffs_mtdif1.c */
param->write_chunk_tags_fn =
nandmtd1_WriteChunkWithTagsToNAND;
param->read_chunk_tags_fn =
nandmtd1_ReadChunkWithTagsFromNAND;
param->bad_block_fn = nandmtd1_MarkNANDBlockBad;
param->query_block_fn = nandmtd1_QueryNANDBlock;
#else
param->write_chunk_fn = nandmtd_WriteChunkToNAND;
param->read_chunk_fn = nandmtd_ReadChunkFromNAND;
#endif
param->is_yaffs2 = 0;
}
/* ... and common functions */
param->erase_fn = nandmtd_EraseBlockInNAND;
param->initialise_flash_fn = nandmtd_InitialiseNAND;
yaffs_dev_to_lc(dev)->putSuperFunc = yaffs_MTDPutSuper;
param->sb_dirty_fn = yaffs_touch_super;
param->gc_control = yaffs_gc_control_callback;
yaffs_dev_to_lc(dev)->superBlock= 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_LinuxContext,contextList);
if(context_iterator->mount_id == mount_id)
found = 0;
}
}
context->mount_id = mount_id;
ylist_add_tail(&(yaffs_dev_to_lc(dev)->contextList), &yaffs_context_list);
up(&yaffs_context_lock);
/* Directory search handling...*/
YINIT_LIST_HEAD(&(yaffs_dev_to_lc(dev)->searchContexts));
param->remove_obj_fn = yaffs_remove_obj_callback;
sema_init(&(yaffs_dev_to_lc(dev)->grossLock), 1);
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->bgThread)
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 struct dentry *yaffs_read_super(struct file_system_type *fs,
int flags, const char *dev_name,
void *data)
{
return mount_bdev(fs, flags, dev_name, data,
yaffs_internal_read_super_mtd);
}
static struct file_system_type yaffs_fs_type = {
.owner = THIS_MODULE,
.name = "yaffs",
.mount = yaffs_read_super,