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android_kernel_cmhtcleo/fs/yaffs2/yaffs_fs.c
Markinus e34adb00cb Add EVOs source as default
2010-08-27 11:19:57 +02:00

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/*
* YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
*
* Copyright (C) 2002-2009 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_Device associated with
* this superblock
* >> 2.6: sb->s_fs_info points to the yaffs_Device associated with this
* superblock
* >> inode->u.generic_ip points to the associated yaffs_Object.
*/
const char *yaffs_fs_c_version =
"$Id$";
extern const char *yaffs_guts_c_version;
#include <linux/version.h>
#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/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 "asm/div64.h"
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
#include <linux/statfs.h> /* Added NCB 15-8-2003 */
#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, 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 "yportenv.h"
#include "yaffs_guts.h"
#include <linux/mtd/mtd.h>
#include "yaffs_mtdif.h"
#include "yaffs_mtdif1.h"
#include "yaffs_mtdif2.h"
unsigned int yaffs_traceMask = YAFFS_TRACE_BAD_BLOCKS;
unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS;
unsigned int yaffs_auto_checkpoint = 1;
/* Module Parameters */
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
module_param(yaffs_traceMask, uint, 0644);
module_param(yaffs_wr_attempts, uint, 0644);
module_param(yaffs_auto_checkpoint, uint, 0644);
#else
MODULE_PARM(yaffs_traceMask, "i");
MODULE_PARM(yaffs_wr_attempts, "i");
MODULE_PARM(yaffs_auto_checkpoint, "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
/*#define T(x) printk x */
#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_Object *)(yaffs_InodeToObjectLV(iptr)))
#define yaffs_DentryToObject(dptr) yaffs_InodeToObject((dptr)->d_inode)
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
#define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->s_fs_info)
#else
#define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->u.generic_sbp)
#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
static int yaffs_sync_object(struct file *file, struct dentry *dentry,
int datasync);
static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
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);
#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);
static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
#if (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
static void yaffs_delete_inode(struct inode *);
static void yaffs_clear_inode(struct inode *);
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
#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 (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
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 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
static const struct inode_operations yaffs_file_inode_operations = {
.setattr = yaffs_setattr,
};
static const struct inode_operations yaffs_symlink_inode_operations = {
.readlink = yaffs_readlink,
.follow_link = yaffs_follow_link,
.setattr = yaffs_setattr,
};
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,
};
static const struct file_operations yaffs_dir_operations = {
.read = generic_read_dir,
.readdir = yaffs_readdir,
.fsync = yaffs_sync_object,
};
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,
.delete_inode = yaffs_delete_inode,
.clear_inode = yaffs_clear_inode,
.sync_fs = yaffs_sync_fs,
.write_super = yaffs_write_super,
};
static void yaffs_GrossLock(yaffs_Device *dev)
{
T(YAFFS_TRACE_OS, ("yaffs locking %p\n", current));
down(&dev->grossLock);
T(YAFFS_TRACE_OS, ("yaffs locked %p\n", current));
}
static void yaffs_GrossUnlock(yaffs_Device *dev)
{
T(YAFFS_TRACE_OS, ("yaffs unlocking %p\n", current));
up(&dev->grossLock);
}
/*-----------------------------------------------------------------*/
/* 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 removeObjectCallback 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_Device 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_Device *dev;
yaffs_Object *dirObj;
yaffs_Object *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_Object *dir)
{
yaffs_Device *dev = dir->myDev;
struct yaffs_SearchContext *sc = YMALLOC(sizeof(struct yaffs_SearchContext));
if(sc){
sc->dirObj = dir;
sc->dev = dev;
if( ylist_empty(&sc->dirObj->variant.directoryVariant.children))
sc->nextReturn = NULL;
else
sc->nextReturn = ylist_entry(
dir->variant.directoryVariant.children.next,
yaffs_Object,siblings);
YINIT_LIST_HEAD(&sc->others);
ylist_add(&sc->others,&dev->searchContexts);
}
return sc;
}
/*
* yaffs_EndSearch() disposes of a search context and cleans up.
*/
static void yaffs_EndSearch(struct yaffs_SearchContext * sc)
{
if(sc){
ylist_del(&sc->others);
YFREE(sc);
}
}
/*
* yaffs_SearchAdvance() 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_SearchAdvance(struct yaffs_SearchContext *sc)
{
if(!sc)
return;
if( sc->nextReturn == NULL ||
ylist_empty(&sc->dirObj->variant.directoryVariant.children))
sc->nextReturn = NULL;
else {
struct ylist_head *next = sc->nextReturn->siblings.next;
if( next == &sc->dirObj->variant.directoryVariant.children)
sc->nextReturn = NULL; /* end of list */
else
sc->nextReturn = ylist_entry(next,yaffs_Object,siblings);
}
}
/*
* yaffs_RemoveObjectCallback() 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_RemoveObjectCallback(yaffs_Object *obj)
{
struct ylist_head *i;
struct yaffs_SearchContext *sc;
struct ylist_head *search_contexts = &obj->myDev->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_SearchAdvance(sc);
}
}
}
/*-----------------------------------------------------------------*/
static int yaffs_readlink(struct dentry *dentry, char __user *buffer,
int buflen)
{
unsigned char *alias;
int ret;
yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
yaffs_GrossLock(dev);
alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
yaffs_GrossUnlock(dev);
if (!alias)
return -ENOMEM;
ret = vfs_readlink(dentry, buffer, buflen, alias);
kfree(alias);
return ret;
}
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
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_Device *dev = yaffs_DentryToObject(dentry)->myDev;
yaffs_GrossLock(dev);
alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
yaffs_GrossUnlock(dev);
if (!alias) {
ret = -ENOMEM;
goto out;
}
ret = vfs_follow_link(nd, alias);
kfree(alias);
out:
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
return ERR_PTR(ret);
#else
return ret;
#endif
}
struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
yaffs_Object *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_Object *obj;
struct inode *inode = NULL; /* NCB 2.5/2.6 needs NULL here */
yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev;
yaffs_GrossLock(dev);
T(YAFFS_TRACE_OS,
("yaffs_lookup for %d:%s\n",
yaffs_InodeToObject(dir)->objectId, dentry->d_name.name));
obj = yaffs_FindObjectByName(yaffs_InodeToObject(dir),
dentry->d_name.name);
obj = yaffs_GetEquivalentObject(obj); /* in case it was a hardlink */
/* Can't hold gross lock when calling yaffs_get_inode() */
yaffs_GrossUnlock(dev);
if (obj) {
T(YAFFS_TRACE_OS,
("yaffs_lookup found %d\n", obj->objectId));
inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
if (inode) {
T(YAFFS_TRACE_OS,
("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, ("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,
("yaffs_put_inode: ino %d, count %d\n", (int)inode->i_ino,
atomic_read(&inode->i_count)));
}
#endif
/* clear is called to tell the fs to release any per-inode data it holds */
static void yaffs_clear_inode(struct inode *inode)
{
yaffs_Object *obj;
yaffs_Device *dev;
obj = yaffs_InodeToObject(inode);
T(YAFFS_TRACE_OS,
("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->myDev;
yaffs_GrossLock(dev);
/* Clear the association between the inode and
* the yaffs_Object.
*/
obj->myInode = 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_HandleDeferedFree(obj);
yaffs_GrossUnlock(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_Object *obj = yaffs_InodeToObject(inode);
yaffs_Device *dev;
T(YAFFS_TRACE_OS,
("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->myDev;
yaffs_GrossLock(dev);
yaffs_DeleteObject(obj);
yaffs_GrossUnlock(dev);
}
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
truncate_inode_pages(&inode->i_data, 0);
#endif
clear_inode(inode);
}
#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_Object *obj = yaffs_DentryToObject(file->f_dentry);
yaffs_Device *dev = obj->myDev;
T(YAFFS_TRACE_OS,
("yaffs_file_flush object %d (%s)\n", obj->objectId,
obj->dirty ? "dirty" : "clean"));
yaffs_GrossLock(dev);
yaffs_FlushFile(obj, 1);
yaffs_GrossUnlock(dev);
return 0;
}
#define buffsize 100
static int yaffs_readpage_nolock(struct file *f, struct page *pg)
{
/* Lifted from jffs2 */
yaffs_Object *obj;
unsigned char *pg_buf;
int ret;
static char buf_src[buffsize], buf_dest[buffsize];
static int no = 1;
yaffs_Device *dev;
T(YAFFS_TRACE_OS, ("yaffs_readpage at %08x, size %08x\n",
(unsigned)(pg->index << PAGE_CACHE_SHIFT),
(unsigned)PAGE_CACHE_SIZE));
if (yaffs_traceMask & YAFFS_TRACE_HTC_DEBUG) {
snprintf(buf_src, buffsize, "%d, %s, %s\n", \
(unsigned)(current->pid), current->comm, f->f_dentry->d_name.name);
if (!memcmp(buf_src, buf_dest, sizeof(buf_src) > buffsize?sizeof(buf_src):buffsize)) {
no++;
} else {
pr_info("[YAFFS] %d, %s", no, buf_dest);
memcpy(buf_dest, buf_src, sizeof(buf_src) > buffsize?sizeof(buf_src):buffsize);
no = 1;
}
}
obj = yaffs_DentryToObject(f->f_dentry);
dev = obj->myDev;
#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_GrossLock(dev);
ret = yaffs_ReadDataFromFile(obj, pg_buf,
pg->index << PAGE_CACHE_SHIFT,
PAGE_CACHE_SIZE);
yaffs_GrossUnlock(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, ("yaffs_readpage 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)
{
return yaffs_readpage_unlock(f, pg);
}
/* 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
{
struct address_space *mapping = page->mapping;
loff_t offset = (loff_t) page->index << PAGE_CACHE_SHIFT;
struct inode *inode;
unsigned long end_index;
char *buffer;
yaffs_Object *obj;
int nWritten = 0;
unsigned nBytes;
if (!mapping)
BUG();
inode = mapping->host;
if (!inode)
BUG();
if (offset > inode->i_size) {
T(YAFFS_TRACE_OS,
("yaffs_writepage at %08x, inode size = %08x!!!\n",
(unsigned)(page->index << PAGE_CACHE_SHIFT),
(unsigned)inode->i_size));
T(YAFFS_TRACE_OS,
(" -> don't care!!\n"));
unlock_page(page);
return 0;
}
end_index = inode->i_size >> PAGE_CACHE_SHIFT;
/* easy case */
if (page->index < end_index)
nBytes = PAGE_CACHE_SIZE;
else
nBytes = inode->i_size & (PAGE_CACHE_SIZE - 1);
get_page(page);
buffer = kmap(page);
obj = yaffs_InodeToObject(inode);
yaffs_GrossLock(obj->myDev);
T(YAFFS_TRACE_OS,
("yaffs_writepage at %08x, size %08x\n",
(unsigned)(page->index << PAGE_CACHE_SHIFT), nBytes));
T(YAFFS_TRACE_OS,
("writepag0: obj = %05x, ino = %05x\n",
(int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
nWritten = yaffs_WriteDataToFile(obj, buffer,
page->index << PAGE_CACHE_SHIFT, nBytes, 0);
T(YAFFS_TRACE_OS,
("writepag1: obj = %05x, ino = %05x\n",
(int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
yaffs_GrossUnlock(obj->myDev);
kunmap(page);
SetPageUptodate(page);
UnlockPage(page);
put_page(page);
return (nWritten == nBytes) ? 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;
uint32_t offset = pos & (PAGE_CACHE_SIZE - 1);
uint32_t to = offset + len;
int ret = 0;
int space_held = 0;
T(YAFFS_TRACE_OS, ("start yaffs_write_begin\n"));
/* 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;
}
/* Get fs space */
space_held = yaffs_hold_space(filp);
if (!space_held) {
ret = -ENOSPC;
goto out;
}
/* Update page if required */
if (!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
ret = yaffs_readpage_nolock(filp, pg);
if (ret)
goto out;
/* Happy path return */
T(YAFFS_TRACE_OS, ("end yaffs_write_begin - ok\n"));
return 0;
out:
T(YAFFS_TRACE_OS, ("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, ("yaffs_prepair_write\n"));
if (!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
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 %x pos %x nBytes %d\n",
(unsigned) addr,
(int)pos, copied));
ret = yaffs_file_write(filp, addr, copied, &pos);
if (ret != copied) {
T(YAFFS_TRACE_OS,
("yaffs_write_end not same size ret %d copied %d\n",
ret, copied));
SetPageError(pg);
ClearPageUptodate(pg);
} else {
SetPageUptodate(pg);
}
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 nBytes = to - offset;
int nWritten;
unsigned spos = pos;
unsigned saddr;
kva = kmap(pg);
addr = kva + offset;
saddr = (unsigned) addr;
T(YAFFS_TRACE_OS,
("yaffs_commit_write addr %x pos %x nBytes %d\n",
saddr, spos, nBytes));
nWritten = yaffs_file_write(f, addr, nBytes, &pos);
if (nWritten != nBytes) {
T(YAFFS_TRACE_OS,
("yaffs_commit_write not same size nWritten %d nBytes %d\n",
nWritten, nBytes));
SetPageError(pg);
ClearPageUptodate(pg);
} else {
SetPageUptodate(pg);
}
kunmap(pg);
T(YAFFS_TRACE_OS,
("yaffs_commit_write returning %d\n",
nWritten == nBytes ? 0 : nWritten));
return nWritten == nBytes ? 0 : nWritten;
}
#endif
static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object *obj)
{
if (inode && obj) {
/* Check mode against the variant type and attempt to repair if broken. */
__u32 mode = obj->yst_mode;
switch (obj->variantType) {
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->objectId;
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_GetObjectFileLength(obj);
inode->i_blocks = (inode->i_size + 511) >> 9;
inode->i_nlink = yaffs_GetObjectLinkCount(obj);
T(YAFFS_TRACE_OS,
("yaffs_FillInode 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->myInode = inode;
} else {
T(YAFFS_TRACE_OS,
("yaffs_FileInode invalid parameters\n"));
}
}
struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
yaffs_Object *obj)
{
struct inode *inode;
if (!sb) {
T(YAFFS_TRACE_OS,
("yaffs_get_inode for NULL super_block!!\n"));
return NULL;
}
if (!obj) {
T(YAFFS_TRACE_OS,
("yaffs_get_inode for NULL object!!\n"));
return NULL;
}
T(YAFFS_TRACE_OS,
("yaffs_get_inode for object %d\n", obj->objectId));
inode = Y_IGET(sb, obj->objectId);
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_Object *obj;
int nWritten, ipos;
struct inode *inode;
yaffs_Device *dev;
obj = yaffs_DentryToObject(f->f_dentry);
dev = obj->myDev;
yaffs_GrossLock(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,
("yaffs_file_write: hey obj is null!\n"));
else
T(YAFFS_TRACE_OS,
("yaffs_file_write about to write writing %zu bytes"
"to object %d at %d\n",
n, obj->objectId, ipos));
nWritten = yaffs_WriteDataToFile(obj, buf, ipos, n, 0);
T(YAFFS_TRACE_OS,
("yaffs_file_write writing %zu bytes, %d written at %d\n",
n, nWritten, ipos));
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,
("yaffs_file_write size updated to %d bytes, "
"%d blocks\n",
ipos, (int)(inode->i_blocks)));
}
}
yaffs_GrossUnlock(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_Object *obj;
yaffs_Device *dev;
int nFreeChunks;
obj = yaffs_DentryToObject(f->f_dentry);
dev = obj->myDev;
yaffs_GrossLock(dev);
nFreeChunks = yaffs_GetNumberOfFreeChunks(dev);
yaffs_GrossUnlock(dev);
return (nFreeChunks > 20) ? 1 : 0;
}
static void yaffs_release_space(struct file *f)
{
yaffs_Object *obj;
yaffs_Device *dev;
obj = yaffs_DentryToObject(f->f_dentry);
dev = obj->myDev;
yaffs_GrossLock(dev);
yaffs_GrossUnlock(dev);
}
static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
{
yaffs_Object *obj;
yaffs_Device *dev;
struct yaffs_SearchContext *sc;
struct inode *inode = f->f_dentry->d_inode;
unsigned long offset, curoffs;
yaffs_Object *l;
int retVal = 0;
char name[YAFFS_MAX_NAME_LENGTH + 1];
obj = yaffs_DentryToObject(f->f_dentry);
dev = obj->myDev;
yaffs_GrossLock(dev);
offset = f->f_pos;
sc = yaffs_NewSearch(obj);
if(!sc){
retVal = -ENOMEM;
goto unlock_out;
}
T(YAFFS_TRACE_OS, ("yaffs_readdir: starting at %d\n", (int)offset));
if (offset == 0) {
T(YAFFS_TRACE_OS,
("yaffs_readdir: entry . ino %d \n",
(int)inode->i_ino));
yaffs_GrossUnlock(dev);
if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0)
goto out;
yaffs_GrossLock(dev);
offset++;
f->f_pos++;
}
if (offset == 1) {
T(YAFFS_TRACE_OS,
("yaffs_readdir: entry .. ino %d \n",
(int)f->f_dentry->d_parent->d_inode->i_ino));
yaffs_GrossUnlock(dev);
if (filldir(dirent, "..", 2, offset,
f->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0)
goto out;
yaffs_GrossLock(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_GetObjectInode(l);
int this_type = yaffs_GetObjectType(l);
yaffs_GetObjectName(l, name,
YAFFS_MAX_NAME_LENGTH + 1);
T(YAFFS_TRACE_OS,
("yaffs_readdir: %s inode %d\n", name,
yaffs_GetObjectInode(l)));
yaffs_GrossUnlock(dev);
if (filldir(dirent,
name,
strlen(name),
offset,
this_inode,
this_type) < 0)
goto out;
yaffs_GrossLock(dev);
offset++;
f->f_pos++;
}
yaffs_SearchAdvance(sc);
}
unlock_out:
yaffs_GrossUnlock(dev);
out:
yaffs_EndSearch(sc);
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(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_Object *obj = NULL;
yaffs_Device *dev;
yaffs_Object *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,
("yaffs_mknod: parent object %d type %d\n",
parent->objectId, parent->variantType));
} else {
T(YAFFS_TRACE_OS,
("yaffs_mknod: could not get parent object\n"));
return -EPERM;
}
T(YAFFS_TRACE_OS, ("yaffs_mknod: making oject for %s, "
"mode %x dev %x\n",
dentry->d_name.name, mode, rdev));
dev = parent->myDev;
yaffs_GrossLock(dev);
switch (mode & S_IFMT) {
default:
/* Special (socket, fifo, device...) */
T(YAFFS_TRACE_OS, ("yaffs_mknod: making special\n"));
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
obj = yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
gid, old_encode_dev(rdev));
#else
obj = yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
gid, rdev);
#endif
break;
case S_IFREG: /* file */
T(YAFFS_TRACE_OS, ("yaffs_mknod: making file\n"));
obj = yaffs_MknodFile(parent, dentry->d_name.name, mode, uid,
gid);
break;
case S_IFDIR: /* directory */
T(YAFFS_TRACE_OS,
("yaffs_mknod: making directory\n"));
obj = yaffs_MknodDirectory(parent, dentry->d_name.name, mode,
uid, gid);
break;
case S_IFLNK: /* symlink */
T(YAFFS_TRACE_OS, ("yaffs_mknod: making symlink\n"));
obj = NULL; /* Do we ever get here? */
break;
}
/* Can not call yaffs_get_inode() with gross lock held */
yaffs_GrossUnlock(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,
("yaffs_mknod created object %d count = %d\n",
obj->objectId, atomic_read(&inode->i_count)));
error = 0;
} else {
T(YAFFS_TRACE_OS,
("yaffs_mknod failed making object\n"));
error = -ENOMEM;
}
return error;
}
static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
{
int retVal;
T(YAFFS_TRACE_OS, ("yaffs_mkdir\n"));
retVal = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
return retVal;
}
#if (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, ("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_Device *dev;
T(YAFFS_TRACE_OS,
("yaffs_unlink %d:%s\n", (int)(dir->i_ino),
dentry->d_name.name));
dev = yaffs_InodeToObject(dir)->myDev;
yaffs_GrossLock(dev);
retVal = yaffs_Unlink(yaffs_InodeToObject(dir), dentry->d_name.name);
if (retVal == YAFFS_OK) {
dentry->d_inode->i_nlink--;
dir->i_version++;
yaffs_GrossUnlock(dev);
mark_inode_dirty(dentry->d_inode);
update_dir_time(dir);
return 0;
}
yaffs_GrossUnlock(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_Object *obj = NULL;
yaffs_Object *link = NULL;
yaffs_Device *dev;
T(YAFFS_TRACE_OS, ("yaffs_link\n"));
obj = yaffs_InodeToObject(inode);
dev = obj->myDev;
yaffs_GrossLock(dev);
if (!S_ISDIR(inode->i_mode)) /* Don't link directories */
link = yaffs_Link(yaffs_InodeToObject(dir), dentry->d_name.name,
obj);
if (link) {
old_dentry->d_inode->i_nlink = yaffs_GetObjectLinkCount(obj);
d_instantiate(dentry, old_dentry->d_inode);
atomic_inc(&old_dentry->d_inode->i_count);
T(YAFFS_TRACE_OS,
("yaffs_link link count %d i_count %d\n",
old_dentry->d_inode->i_nlink,
atomic_read(&old_dentry->d_inode->i_count)));
}
yaffs_GrossUnlock(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_Object *obj;
yaffs_Device *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, ("yaffs_symlink\n"));
dev = yaffs_InodeToObject(dir)->myDev;
yaffs_GrossLock(dev);
obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name,
S_IFLNK | S_IRWXUGO, uid, gid, symname);
yaffs_GrossUnlock(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, ("symlink created OK\n"));
return 0;
} else {
T(YAFFS_TRACE_OS, ("symlink not created\n"));
}
return -ENOMEM;
}
static int yaffs_sync_object(struct file *file, struct dentry *dentry,
int datasync)
{
yaffs_Object *obj;
yaffs_Device *dev;
obj = yaffs_DentryToObject(dentry);
dev = obj->myDev;
T(YAFFS_TRACE_OS, ("yaffs_sync_object\n"));
yaffs_GrossLock(dev);
yaffs_FlushFile(obj, 1);
yaffs_GrossUnlock(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_Device *dev;
int retVal = YAFFS_FAIL;
yaffs_Object *target;
T(YAFFS_TRACE_OS, ("yaffs_rename\n"));
dev = yaffs_InodeToObject(old_dir)->myDev;
yaffs_GrossLock(dev);
/* Check if the target is an existing directory that is not empty. */
target = yaffs_FindObjectByName(yaffs_InodeToObject(new_dir),
new_dentry->d_name.name);
if (target && target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
!ylist_empty(&target->variant.directoryVariant.children)) {
T(YAFFS_TRACE_OS, ("target is non-empty dir\n"));
retVal = YAFFS_FAIL;
} else {
/* Now does unlinking internally using shadowing mechanism */
T(YAFFS_TRACE_OS, ("calling yaffs_RenameObject\n"));
retVal = yaffs_RenameObject(yaffs_InodeToObject(old_dir),
old_dentry->d_name.name,
yaffs_InodeToObject(new_dir),
new_dentry->d_name.name);
}
yaffs_GrossUnlock(dev);
if (retVal == 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;
yaffs_Device *dev;
T(YAFFS_TRACE_OS,
("yaffs_setattr of object %d\n",
yaffs_InodeToObject(inode)->objectId));
error = inode_change_ok(inode, attr);
if (error == 0) {
dev = yaffs_InodeToObject(inode)->myDev;
yaffs_GrossLock(dev);
if (yaffs_SetAttributes(yaffs_InodeToObject(inode), attr) ==
YAFFS_OK) {
error = 0;
} else {
error = -EPERM;
}
yaffs_GrossUnlock(dev);
if (!error)
error = inode_setattr(inode, attr);
}
return error;
}
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
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_Device *dev = yaffs_SuperToDevice(sb);
#else
static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
{
yaffs_Device *dev = yaffs_SuperToDevice(sb);
#endif
T(YAFFS_TRACE_OS, ("yaffs_statfs\n"));
yaffs_GrossLock(dev);
buf->f_type = YAFFS_MAGIC;
buf->f_bsize = sb->s_blocksize;
buf->f_namelen = 255;
if (dev->nDataBytesPerChunk & (dev->nDataBytesPerChunk - 1)) {
/* Do this if chunk size is not a power of 2 */
uint64_t bytesInDev;
uint64_t bytesFree;
bytesInDev = ((uint64_t)((dev->endBlock - dev->startBlock + 1))) *
((uint64_t)(dev->nChunksPerBlock * dev->nDataBytesPerChunk));
do_div(bytesInDev, sb->s_blocksize); /* bytesInDev becomes the number of blocks */
buf->f_blocks = bytesInDev;
bytesFree = ((uint64_t)(yaffs_GetNumberOfFreeChunks(dev))) *
((uint64_t)(dev->nDataBytesPerChunk));
do_div(bytesFree, sb->s_blocksize);
buf->f_bfree = bytesFree;
} else if (sb->s_blocksize > dev->nDataBytesPerChunk) {
buf->f_blocks =
(dev->endBlock - dev->startBlock + 1) *
dev->nChunksPerBlock /
(sb->s_blocksize / dev->nDataBytesPerChunk);
buf->f_bfree =
yaffs_GetNumberOfFreeChunks(dev) /
(sb->s_blocksize / dev->nDataBytesPerChunk);
} else {
buf->f_blocks =
(dev->endBlock - dev->startBlock + 1) *
dev->nChunksPerBlock *
(dev->nDataBytesPerChunk / sb->s_blocksize);
buf->f_bfree =
yaffs_GetNumberOfFreeChunks(dev) *
(dev->nDataBytesPerChunk / sb->s_blocksize);
}
buf->f_files = 0;
buf->f_ffree = 0;
buf->f_bavail = buf->f_bfree;
yaffs_GrossUnlock(dev);
return 0;
}
static int yaffs_do_sync_fs(struct super_block *sb)
{
yaffs_Device *dev = yaffs_SuperToDevice(sb);
T(YAFFS_TRACE_OS, ("yaffs_do_sync_fs\n"));
if (sb->s_dirt) {
yaffs_GrossLock(dev);
if (dev) {
yaffs_FlushEntireDeviceCache(dev);
yaffs_CheckpointSave(dev);
}
yaffs_GrossUnlock(dev);
sb->s_dirt = 0;
}
return 0;
}
#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
{
T(YAFFS_TRACE_OS, ("yaffs_write_super\n"));
if (yaffs_auto_checkpoint >= 2)
yaffs_do_sync_fs(sb);
#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
{
T(YAFFS_TRACE_OS, ("yaffs_sync_fs\n"));
if (yaffs_auto_checkpoint >= 1)
yaffs_do_sync_fs(sb);
return 0;
}
#ifdef YAFFS_USE_OWN_IGET
static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino)
{
struct inode *inode;
yaffs_Object *obj;
yaffs_Device *dev = yaffs_SuperToDevice(sb);
T(YAFFS_TRACE_OS,
("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_GrossLock(dev);
obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
yaffs_FillInodeFromObject(inode, obj);
yaffs_GrossUnlock(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_Object *obj;
yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
T(YAFFS_TRACE_OS,
("yaffs_read_inode for %d\n", (int)inode->i_ino));
yaffs_GrossLock(dev);
obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
yaffs_FillInodeFromObject(inode, obj);
yaffs_GrossUnlock(dev);
}
#endif
static YLIST_HEAD(yaffs_dev_list);
#if 0 /* not used */
static int yaffs_remount_fs(struct super_block *sb, int *flags, char *data)
{
yaffs_Device *dev = yaffs_SuperToDevice(sb);
if (*flags & MS_RDONLY) {
struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
T(YAFFS_TRACE_OS,
("yaffs_remount_fs: %s: RO\n", dev->name));
yaffs_GrossLock(dev);
yaffs_FlushEntireDeviceCache(dev);
yaffs_CheckpointSave(dev);
if (mtd->sync)
mtd->sync(mtd);
yaffs_GrossUnlock(dev);
} else {
T(YAFFS_TRACE_OS,
("yaffs_remount_fs: %s: RW\n", dev->name));
}
return 0;
}
#endif
static void yaffs_put_super(struct super_block *sb)
{
yaffs_Device *dev = yaffs_SuperToDevice(sb);
T(YAFFS_TRACE_OS, ("yaffs_put_super\n"));
yaffs_GrossLock(dev);
yaffs_FlushEntireDeviceCache(dev);
yaffs_CheckpointSave(dev);
if (dev->putSuperFunc)
dev->putSuperFunc(sb);
yaffs_Deinitialise(dev);
yaffs_GrossUnlock(dev);
/* we assume this is protected by lock_kernel() in mount/umount */
ylist_del(&dev->devList);
if (dev->spareBuffer) {
YFREE(dev->spareBuffer);
dev->spareBuffer = NULL;
}
kfree(dev);
}
static void yaffs_MTDPutSuper(struct super_block *sb)
{
struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
if (mtd->sync)
mtd->sync(mtd);
put_mtd_device(mtd);
}
static void yaffs_MarkSuperBlockDirty(void *vsb)
{
struct super_block *sb = (struct super_block *)vsb;
T(YAFFS_TRACE_OS, ("yaffs_MarkSuperBlockDirty() 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 empty_lost_and_found_overridden;
int empty_lost_and_found;
} yaffs_options;
#define MAX_OPT_LEN 20
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, "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 if (!strcmp(cur_opt, "empty-lost-and-found-disable")) {
options->empty_lost_and_found = 0;
options->empty_lost_and_found_overridden = 1;
} else if (!strcmp(cur_opt, "empty-lost-and-found-enable")) {
options->empty_lost_and_found = 1;
options->empty_lost_and_found_overridden = 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 yaffsVersion,
struct super_block *sb,
void *data, int silent)
{
int nBlocks;
struct inode *inode = NULL;
struct dentry *root;
yaffs_Device *dev = 0;
char devname_buf[BDEVNAME_SIZE + 1];
struct mtd_info *mtd;
int err;
char *data_str = (char *)data;
yaffs_options options;
sb->s_magic = YAFFS_MAGIC;
sb->s_op = &yaffs_super_ops;
sb->s_flags |= MS_NOATIME;
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\"\n",
sb->s_dev,
yaffs_devname(sb, devname_buf));
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, ("yaffs_read_super: Using yaffs%d\n", yaffsVersion));
T(YAFFS_TRACE_OS,
("yaffs_read_super: block size %d\n", (int)(sb->s_blocksize)));
#ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
T(YAFFS_TRACE_OS,
("yaffs: Write verification disabled. All guarantees "
"null and void\n"));
#endif
T(YAFFS_TRACE_ALWAYS, ("yaffs: Attempting MTD mount on %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,
("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,
("yaffs: MTD device is not NAND it's type %d\n", mtd->type));
return NULL;
}
T(YAFFS_TRACE_OS, (" erase %p\n", mtd->erase));
T(YAFFS_TRACE_OS, (" read %p\n", mtd->read));
T(YAFFS_TRACE_OS, (" write %p\n", mtd->write));
T(YAFFS_TRACE_OS, (" readoob %p\n", mtd->read_oob));
T(YAFFS_TRACE_OS, (" writeoob %p\n", mtd->write_oob));
T(YAFFS_TRACE_OS, (" block_isbad %p\n", mtd->block_isbad));
T(YAFFS_TRACE_OS, (" block_markbad %p\n", mtd->block_markbad));
T(YAFFS_TRACE_OS, (" %s %d\n", WRITE_SIZE_STR, WRITE_SIZE(mtd)));
T(YAFFS_TRACE_OS, (" oobsize %d\n", mtd->oobsize));
T(YAFFS_TRACE_OS, (" erasesize %d\n", mtd->erasesize));
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
T(YAFFS_TRACE_OS, (" size %u\n", mtd->size));
#else
T(YAFFS_TRACE_OS, (" size %lld\n", mtd->size));
#endif
#ifdef CONFIG_YAFFS_EMPTY_LOST_AND_FOUND
dev->emptyLostAndFound = 1;
#endif
if(options.empty_lost_and_found_overridden)
dev->emptyLostAndFound = options.empty_lost_and_found;
#ifdef CONFIG_YAFFS_AUTO_YAFFS2
if (yaffsVersion == 1 && WRITE_SIZE(mtd) >= 2048) {
T(YAFFS_TRACE_ALWAYS, ("yaffs: auto selecting yaffs2\n"));
yaffsVersion = 2;
}
/* Added NCB 26/5/2006 for completeness */
if (yaffsVersion == 2 && !options.inband_tags && WRITE_SIZE(mtd) == 512) {
T(YAFFS_TRACE_ALWAYS, ("yaffs: auto selecting yaffs1\n"));
yaffsVersion = 1;
}
#endif
if (yaffsVersion == 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,
("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,
("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,
("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,
("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_Device up for mtd
*/
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
sb->s_fs_info = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
#else
sb->u.generic_sbp = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
#endif
if (!dev) {
/* Deep shit could not allocate device structure */
T(YAFFS_TRACE_ALWAYS,
("yaffs_read_super: Failed trying to allocate "
"yaffs_Device. \n"));
return NULL;
}
memset(dev, 0, sizeof(yaffs_Device));
dev->genericDevice = mtd;
dev->name = mtd->name;
/* Set up the memory size parameters.... */
nBlocks = YCALCBLOCKS(mtd->size, (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK));
dev->startBlock = 0;
dev->endBlock = nBlocks - 1;
dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
dev->totalBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
dev->nReservedBlocks = 5;
dev->nShortOpCaches = (options.no_cache) ? 0 : 10;
dev->inbandTags = options.inband_tags;
/* ... and the functions. */
if (yaffsVersion == 2) {
dev->writeChunkWithTagsToNAND =
nandmtd2_WriteChunkWithTagsToNAND;
dev->readChunkWithTagsFromNAND =
nandmtd2_ReadChunkWithTagsFromNAND;
dev->markNANDBlockBad = nandmtd2_MarkNANDBlockBad;
dev->queryNANDBlock = nandmtd2_QueryNANDBlock;
dev->spareBuffer = YMALLOC(mtd->oobsize);
dev->isYaffs2 = 1;
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
dev->totalBytesPerChunk = mtd->writesize;
dev->nChunksPerBlock = mtd->erasesize / mtd->writesize;
#else
dev->totalBytesPerChunk = mtd->oobblock;
dev->nChunksPerBlock = mtd->erasesize / mtd->oobblock;
#endif
nBlocks = YCALCBLOCKS(mtd->size, mtd->erasesize);
dev->startBlock = 0;
dev->endBlock = nBlocks - 1;
} else {
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
/* use the MTD interface in yaffs_mtdif1.c */
dev->writeChunkWithTagsToNAND =
nandmtd1_WriteChunkWithTagsToNAND;
dev->readChunkWithTagsFromNAND =
nandmtd1_ReadChunkWithTagsFromNAND;
dev->markNANDBlockBad = nandmtd1_MarkNANDBlockBad;
dev->queryNANDBlock = nandmtd1_QueryNANDBlock;
#else
dev->writeChunkToNAND = nandmtd_WriteChunkToNAND;
dev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
#endif
dev->isYaffs2 = 0;
}
/* ... and common functions */
dev->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
dev->initialiseNAND = nandmtd_InitialiseNAND;
dev->putSuperFunc = yaffs_MTDPutSuper;
dev->superBlock = (void *)sb;
dev->markSuperBlockDirty = yaffs_MarkSuperBlockDirty;
#ifndef CONFIG_YAFFS_DOES_ECC
dev->useNANDECC = 1;
#endif
#ifdef CONFIG_YAFFS_DISABLE_WIDE_TNODES
dev->wideTnodesDisabled = 1;
#endif
dev->skipCheckpointRead = options.skip_checkpoint_read;
dev->skipCheckpointWrite = options.skip_checkpoint_write;
/* we assume this is protected by lock_kernel() in mount/umount */
ylist_add_tail(&dev->devList, &yaffs_dev_list);
/* Directory search handling...*/
YINIT_LIST_HEAD(&dev->searchContexts);
dev->removeObjectCallback = yaffs_RemoveObjectCallback;
init_MUTEX(&dev->grossLock);
yaffs_GrossLock(dev);
err = yaffs_GutsInitialise(dev);
T(YAFFS_TRACE_OS,
("yaffs_read_super: guts initialised %s\n",
(err == YAFFS_OK) ? "OK" : "FAILED"));
/* Release lock before yaffs_get_inode() */
yaffs_GrossUnlock(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, ("yaffs_read_super: got root inode\n"));
root = d_alloc_root(inode);
T(YAFFS_TRACE_OS, ("yaffs_read_super: d_alloc_root done\n"));
if (!root) {
iput(inode);
return NULL;
}
sb->s_root = root;
sb->s_dirt = !dev->isCheckpointed;
T(YAFFS_TRACE_ALWAYS,
("yaffs_read_super: isCheckpointed %d\n", dev->isCheckpointed));
T(YAFFS_TRACE_OS, ("yaffs_read_super: done\n"));
return sb;
}
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
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;
}
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
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);
}
#else
static struct super_block *yaffs_read_super(struct file_system_type *fs,
int flags, const char *dev_name,
void *data)
{
return get_sb_bdev(fs, flags, dev_name, data,
yaffs_internal_read_super_mtd);
}
#endif
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,
};
#else
static struct super_block *yaffs_read_super(struct super_block *sb, void *data,
int silent)
{
return yaffs_internal_read_super(1, sb, data, silent);
}
static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super,
FS_REQUIRES_DEV);
#endif
#ifdef CONFIG_YAFFS_YAFFS2
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
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;
}
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
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);
}
#else
static struct super_block *yaffs2_read_super(struct file_system_type *fs,
int flags, const char *dev_name,
void *data)
{
return get_sb_bdev(fs, flags, dev_name, data,
yaffs2_internal_read_super_mtd);
}
#endif
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,
};
#else
static struct super_block *yaffs2_read_super(struct super_block *sb,
void *data, int silent)
{
return yaffs_internal_read_super(2, sb, data, silent);
}
static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super,
FS_REQUIRES_DEV);
#endif
#endif /* CONFIG_YAFFS_YAFFS2 */
static struct proc_dir_entry *my_proc_entry;
static char *yaffs_dump_dev(char *buf, yaffs_Device * dev)
{
buf += sprintf(buf, "startBlock......... %d\n", dev->startBlock);
buf += sprintf(buf, "endBlock........... %d\n", dev->endBlock);
buf += sprintf(buf, "totalBytesPerChunk. %d\n", dev->totalBytesPerChunk);
buf += sprintf(buf, "nDataBytesPerChunk. %d\n", dev->nDataBytesPerChunk);
buf += sprintf(buf, "chunkGroupBits..... %d\n", dev->chunkGroupBits);
buf += sprintf(buf, "chunkGroupSize..... %d\n", dev->chunkGroupSize);
buf += sprintf(buf, "nErasedBlocks...... %d\n", dev->nErasedBlocks);
buf += sprintf(buf, "nReservedBlocks.... %d\n", dev->nReservedBlocks);
buf += sprintf(buf, "blocksInCheckpoint. %d\n", dev->blocksInCheckpoint);
buf += sprintf(buf, "nTnodesCreated..... %d\n", dev->nTnodesCreated);
buf += sprintf(buf, "nFreeTnodes........ %d\n", dev->nFreeTnodes);
buf += sprintf(buf, "nObjectsCreated.... %d\n", dev->nObjectsCreated);
buf += sprintf(buf, "nFreeObjects....... %d\n", dev->nFreeObjects);
buf += sprintf(buf, "nFreeChunks........ %d\n", dev->nFreeChunks);
buf += sprintf(buf, "nPageWrites........ %d\n", dev->nPageWrites);
buf += sprintf(buf, "nPageReads......... %d\n", dev->nPageReads);
buf += sprintf(buf, "nBlockErasures..... %d\n", dev->nBlockErasures);
buf += sprintf(buf, "nGCCopies.......... %d\n", dev->nGCCopies);
buf += sprintf(buf, "garbageCollections. %d\n", dev->garbageCollections);
buf += sprintf(buf, "passiveGCs......... %d\n",
dev->passiveGarbageCollections);
buf += sprintf(buf, "nRetriedWrites..... %d\n", dev->nRetriedWrites);
buf += sprintf(buf, "nShortOpCaches..... %d\n", dev->nShortOpCaches);
buf += sprintf(buf, "nRetireBlocks...... %d\n", dev->nRetiredBlocks);
buf += sprintf(buf, "eccFixed........... %d\n", dev->eccFixed);
buf += sprintf(buf, "eccUnfixed......... %d\n", dev->eccUnfixed);
buf += sprintf(buf, "tagsEccFixed....... %d\n", dev->tagsEccFixed);
buf += sprintf(buf, "tagsEccUnfixed..... %d\n", dev->tagsEccUnfixed);
buf += sprintf(buf, "cacheHits.......... %d\n", dev->cacheHits);
buf += sprintf(buf, "nDeletedFiles...... %d\n", dev->nDeletedFiles);
buf += sprintf(buf, "nUnlinkedFiles..... %d\n", dev->nUnlinkedFiles);
buf +=
sprintf(buf, "nBackgroudDeletions %d\n", dev->nBackgroundDeletions);
buf += sprintf(buf, "useNANDECC......... %d\n", dev->useNANDECC);
buf += sprintf(buf, "isYaffs2........... %d\n", dev->isYaffs2);
buf += sprintf(buf, "inbandTags......... %d\n", dev->inbandTags);
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 devList.
* 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%s\n%s\n", yaffs_fs_c_version,
yaffs_guts_c_version);
}
/* hold lock_kernel while traversing yaffs_dev_list */
lock_kernel();
/* Locate and print the Nth entry. Order N-squared but N is small. */
ylist_for_each(item, &yaffs_dev_list) {
yaffs_Device *dev = ylist_entry(item, yaffs_Device, devList);
if (n < step) {
n++;
continue;
}
buf += sprintf(buf, "\nDevice %d \"%s\"\n", n, dev->name);
buf = yaffs_dump_dev(buf, dev);
break;
}
unlock_kernel();
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},
{"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},
{"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},
{"verify", YAFFS_TRACE_VERIFY},
{"verify_nand", YAFFS_TRACE_VERIFY_NAND},
{"verify_full", YAFFS_TRACE_VERIFY_FULL},
{"verify_all", YAFFS_TRACE_VERIFY_ALL},
{"write", YAFFS_TRACE_WRITE},
{"all", 0xffffffff},
{"none", 0},
{NULL, 0},
};
#define MAX_MASK_NAME_LENGTH 40
static int yaffs_proc_write(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_traceMask;
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_traceMask = rg | YAFFS_TRACE_ALWAYS;
printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_traceMask);
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;
}
/* 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,
("yaffs " __DATE__ " " __TIME__ " Installing. \n"));
/* Install the proc_fs entry */
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;
/* 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, ("yaffs " __DATE__ " " __TIME__
" removing. \n"));
remove_proc_entry("yaffs", 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., 2002-2006");
MODULE_LICENSE("GPL");
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