*** empty log message ***
authorcharles <charles>
Fri, 17 Dec 2004 04:39:04 +0000 (04:39 +0000)
committercharles <charles>
Fri, 17 Dec 2004 04:39:04 +0000 (04:39 +0000)
18 files changed:
mtdemul/Makefile [new file with mode: 0644]
mtdemul/nandemul2k.c [new file with mode: 0644]
yaffs_fs.c [new file with mode: 0644]
yaffs_guts.c
yaffs_guts.h
yaffs_mtdif.c [new file with mode: 0644]
yaffs_mtdif.h [new file with mode: 0644]
yaffs_mtdif2.c [new file with mode: 0644]
yaffs_mtdif2.h [new file with mode: 0644]
yaffs_nandemul.h [new file with mode: 0644]
yaffs_nandemul2k.h [new file with mode: 0644]
yaffs_packedtags1.c
yaffs_packedtags1.h
yaffs_packedtags2.c
yaffs_packedtags2.h
yaffs_ramem.c [new file with mode: 0644]
yaffs_ramem2k.c [new file with mode: 0644]
yportenv.h

diff --git a/mtdemul/Makefile b/mtdemul/Makefile
new file mode 100644 (file)
index 0000000..2a2029c
--- /dev/null
@@ -0,0 +1,33 @@
+#Makefile for NANDemul MTD
+#
+# NB this is not yet suitable for putting into the kernel tree.
+# YAFFS: Yet another FFS. A NAND-flash specific file system. 
+#
+# Copyright (C) 2002 Aleph One Ltd.
+#   for Toby Churchill Ltd and Brightstar Engineering
+#
+# Created by Charles Manning <charles@aleph1.co.uk>
+#
+# 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.
+
+## Change or override  KERNELDIR to your kernel
+## comment out USE_xxxx if you don't want these features.
+
+KERNELDIR = /usr/src/kernel-headers-2.4.27
+
+CFLAGS = -D__KERNEL__ -DMODULE   -I$(KERNELDIR)/include -O2 -Wall -g
+
+
+
+TARGET = nandemul2k.o
+
+default: $(TARGET)
+
+clean:
+       rm -f $(TARGET)
+
+$(TARGET): %.o: %.c
+       gcc -c $(CFLAGS) $< -o $@
+
diff --git a/mtdemul/nandemul2k.c b/mtdemul/nandemul2k.c
new file mode 100644 (file)
index 0000000..2980f9a
--- /dev/null
@@ -0,0 +1,696 @@
+/*
+ * YAFFS: Yet another FFS. A NAND-flash specific file system. 
+ *
+ * Copyright (C) 2002 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * 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 version hacked for emulating 2kpage NAND for YAFFS2 testing.
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/fs.h>
+#include <linux/proc_fs.h>
+#include <linux/pagemap.h>
+#include <linux/mtd/mtd.h>
+#include <linux/interrupt.h>
+#include <linux/string.h>
+#include <linux/locks.h>
+
+#include <asm/uaccess.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+#include <linux/mtd/nand.h>
+
+#define T(f,x) printk x
+#define ALLOCATE(x) kmalloc(x,GFP_KERNEL)
+#define FREE(x)     kfree(x)
+
+
+
+
+
+#define EM_SIZE_IN_MEG 4
+#define PAGE_DATA_SIZE  (2048)
+#define PAGE_SPARE_SIZE (64)
+#define PAGES_PER_BLOCK (64)
+#define NAND_SHIFT      (11)   // Shifter for 2k
+
+
+#define EM_SIZE_IN_BYTES (EM_SIZE_IN_MEG * (1<<20))
+
+#define PAGE_TOTAL_SIZE (PAGE_DATA_SIZE+PAGE_SPARE_SIZE)
+
+#define BLOCK_TOTAL_SIZE (PAGES_PER_BLOCK * PAGE_TOTAL_SIZE)
+
+#define BLOCKS_PER_MEG ((1<<20)/(PAGES_PER_BLOCK * PAGE_DATA_SIZE))
+
+
+static struct mtd_info nandemul2k_mtd;
+
+typedef struct 
+{
+       __u8 data[PAGE_TOTAL_SIZE]; // Data + spare
+       int empty;      // is this empty?
+} nandemul_Page;
+
+
+typedef struct
+{
+       nandemul_Page *page[PAGES_PER_BLOCK];
+       int damaged;    
+} nandemul_Block;
+
+
+
+typedef struct
+{
+       nandemul_Block**block;
+       int nBlocks;
+} nandemul_Device;
+
+static nandemul_Device ned;
+
+static int sizeInMB = EM_SIZE_IN_MEG;
+
+
+static void nandemul_yield(int n)
+{
+#ifdef __KERNEL__
+       if(n > 0) schedule_timeout(n);
+#endif
+
+}
+
+
+static void nandemul2k_Read(void *buffer, int page, int start, int nBytes)
+{
+       int pg = page%PAGES_PER_BLOCK;
+       int blk = page/PAGES_PER_BLOCK;
+       if(buffer && nBytes > 0)
+       {
+               memcpy(buffer,&ned.block[blk]->page[pg]->data[start],nBytes);
+       }
+       
+}
+
+static void nandemul2k_Program(const void *buffer, int page, int start, int nBytes)
+{
+       int pg = page%PAGES_PER_BLOCK;
+       int blk = page/PAGES_PER_BLOCK;
+       __u8 *p;
+       __u8 *b = (__u8 *)buffer;
+
+       p = &ned.block[blk]->page[pg]->data[start];
+       
+       while(buffer && nBytes>0)
+       {
+               *p = *p & *b;
+               p++;
+               b++;
+               nBytes--;
+       }
+}
+
+static void nandemul2k_DoErase(int blockNumber)
+{
+       int i;
+       
+       nandemul_Block *blk;
+       
+       if(blockNumber < 0 || blockNumber >= ned.nBlocks)
+       {
+               return;
+       }
+       
+       blk = ned.block[blockNumber];
+       
+       for(i = 0; i < PAGES_PER_BLOCK; i++)
+       {
+               memset(blk->page[i],0xff,sizeof(nandemul_Page));
+               blk->page[i]->empty = 1;
+       }
+       nandemul_yield(2);
+}
+
+
+static int nandemul2k_CalcNBlocks(void)
+{
+       return EM_SIZE_IN_MEG * BLOCKS_PER_MEG;
+}
+
+
+
+static int  CheckInit(void)
+{
+       static int initialised = 0;
+       
+       int i,j;
+       
+       int fail = 0;
+       int nBlocks; 
+
+       int nAllocated = 0;
+       
+       if(initialised) 
+       {
+               return 0;
+       }
+       
+       
+       ned.nBlocks = nBlocks = nandemul2k_CalcNBlocks();
+
+       
+       ned.block = ALLOCATE(sizeof(nandemul_Block*) * nBlocks );
+       
+       if(!ned.block) return ENOMEM;
+       
+       
+       
+
+               
+       for(i=fail=0; i <nBlocks; i++)
+       {
+               
+               nandemul_Block *blk;
+               
+               if(!(blk = ned.block[i] = ALLOCATE(sizeof(nandemul_Block))))
+               {
+                fail = 1;
+               }  
+               else
+               {
+                       for(j = 0; j < PAGES_PER_BLOCK; j++)
+                       {
+                               if((blk->page[j] = ALLOCATE(sizeof(nandemul_Page))) == 0)
+                               {
+                                       fail = 1;
+                               }
+                       }
+                       nandemul2k_DoErase(i);
+                       ned.block[i]->damaged = 0;
+                       nAllocated++;
+               }
+       }
+       
+       if(fail)
+       {
+               //Todo thump pages
+               
+               for(i = 0; i < nAllocated; i++)
+               {
+                       FREE(ned.block[i]);
+               }
+               FREE(ned.block);
+               
+               return ENOMEM;
+       }
+       
+       ned.nBlocks = nBlocks;
+       
+       initialised = 1;
+       
+       return 1;
+}
+
+
+
+static void nandemul2k_CleanUp(void)
+{
+       int i,j;
+       
+       for(i = 0; i < ned.nBlocks; i++)
+       {
+               for(j = 0; j < PAGES_PER_BLOCK; j++)
+               {
+                  FREE(ned.block[i]->page[j]);
+               }
+               FREE(ned.block[i]);
+               
+       }
+       FREE(ned.block);
+       ned.block = 0;
+}
+
+int nandemul2k_GetBytesPerChunk(void) { return PAGE_DATA_SIZE;}
+
+int nandemul2k_GetChunksPerBlock(void) { return PAGES_PER_BLOCK; }
+int nandemul2k_GetNumberOfBlocks(void) {return nandemul2k_CalcNBlocks();}
+
+
+
+int nandemul2k_ReadId(__u8 *vendorId, __u8 *deviceId)
+{
+       *vendorId = 'Y'; 
+       *deviceId = '2';
+       
+       return 1;
+}
+
+
+int nandemul2k_ReadStatus(__u8 *status)
+{
+               *status = 0;
+               return 1;
+}
+
+
+#ifdef CONFIG_MTD_NAND_ECC
+#include <linux/mtd/nand_ecc.h>
+#endif
+
+/*
+ * NAND low-level MTD interface functions
+ */
+static int nand_read (struct mtd_info *mtd, loff_t from, size_t len,
+                       size_t *retlen, u_char *buf);
+static int nand_read_ecc (struct mtd_info *mtd, loff_t from, size_t len,
+                               size_t *retlen, u_char *buf, u_char *oob_buf, struct nand_oobinfo *dummy);
+static int nand_read_oob (struct mtd_info *mtd, loff_t from, size_t len,
+                               size_t *retlen, u_char *buf);
+static int nand_write (struct mtd_info *mtd, loff_t to, size_t len,
+                       size_t *retlen, const u_char *buf);
+static int nand_write_ecc (struct mtd_info *mtd, loff_t to, size_t len,
+                               size_t *retlen, const u_char *buf,
+                               const u_char *oob_buf, struct nand_oobinfo *dummy);
+static int nand_write_oob (struct mtd_info *mtd, loff_t to, size_t len,
+                               size_t *retlen, const u_char *buf);
+static int nand_writev (struct mtd_info *mtd, const struct iovec *vecs,
+                               unsigned long count, loff_t to, size_t *retlen);
+static int nand_erase (struct mtd_info *mtd, struct erase_info *instr);
+static void nand_sync (struct mtd_info *mtd);
+
+
+
+/*
+ * NAND read
+ */
+static int nand_read (struct mtd_info *mtd, loff_t from, size_t len,
+                       size_t *retlen, u_char *buf)
+{
+       return nand_read_ecc (mtd, from, len, retlen, buf, NULL,NULL);
+}
+
+
+/*
+ * NAND read with ECC
+ */
+static int nand_read_ecc (struct mtd_info *mtd, loff_t from, size_t len,
+                               size_t *retlen, u_char *buf, u_char *oob_buf,struct nand_oobinfo *oobsel)
+{
+       int     start, page;
+       int n = len;
+       int nToCopy;
+
+
+
+       /* Do not allow reads past end of device */
+       if ((from + len) > mtd->size) {
+               *retlen = 0;
+               return -EINVAL;
+       }
+
+
+       /* Initialize return value */
+       *retlen = 0;
+
+       while(n > 0)
+       {
+
+               /* First we calculate the starting page */
+               page = from >> NAND_SHIFT;
+
+               /* Get raw starting column */
+
+               start = from & (mtd->oobblock-1);
+
+               // OK now check for the curveball where the start and end are in
+               // the same page
+               if((start + n) < mtd->oobblock)
+               {
+                       nToCopy = n;
+               }
+               else
+               {
+                       nToCopy =  mtd->oobblock - start;
+               }
+
+               nandemul2k_Read(buf, page, start, nToCopy);
+               nandemul2k_Read(oob_buf,page,PAGE_DATA_SIZE,PAGE_SPARE_SIZE);
+
+               n -= nToCopy;
+               from += nToCopy;
+               buf += nToCopy;
+               if(oob_buf) oob_buf += PAGE_SPARE_SIZE;
+               *retlen += nToCopy;
+
+       }
+
+
+       return 0;
+}
+
+/*
+ * NAND read out-of-band
+ */
+static int nand_read_oob (struct mtd_info *mtd, loff_t from, size_t len,
+                               size_t *retlen, u_char *buf)
+{
+       int col, page;
+
+       T(0,("nand_read_oob: from = 0x%08x, buf = 0x%08x, len = %i\n", (unsigned int) from, (unsigned int) buf,
+               (int) len));
+
+       /* Shift to get page */
+       page = ((int) from) >> NAND_SHIFT;
+
+       /* Mask to get column */
+       col = from & 0x0f;
+
+       /* Initialize return length value */
+       *retlen = 0;
+
+       /* Do not allow reads past end of device */
+       if ((from + len) > mtd->size) {
+               T(0,
+                       ("nand_read_oob: Attempt read beyond end of device\n"));
+               *retlen = 0;
+               return -EINVAL;
+       }
+
+       nandemul2k_Read(buf,page,PAGE_DATA_SIZE + col,len);
+
+       /* Return happy */
+       *retlen = len;
+       return 0;
+}
+
+/*
+ * NAND write
+ */
+static int nand_write (struct mtd_info *mtd, loff_t to, size_t len,
+                       size_t *retlen, const u_char *buf)
+{
+       return nand_write_ecc (mtd, to, len, retlen, buf, NULL,NULL);
+}
+
+/*
+ * NAND write with ECC
+ */
+static int nand_write_ecc (struct mtd_info *mtd, loff_t to, size_t len,
+                               size_t *retlen, const u_char *buf,
+                               const u_char *oob_buf, struct nand_oobinfo *dummy)
+{
+
+       int     start, page;
+       int n = len;
+       int nToCopy;
+
+
+
+       /* Do not allow reads past end of device */
+       if ((to + len) > mtd->size) {
+               *retlen = 0;
+               return -EINVAL;
+       }
+
+
+       /* Initialize return value */
+       *retlen = 0;
+
+       while(n > 0)
+       {
+
+               /* First we calculate the starting page */
+               page = to >> NAND_SHIFT;
+
+               /* Get raw starting column */
+
+               start = to & (mtd->oobblock - 1);
+
+               // OK now check for the curveball where the start and end are in
+               // the same page
+               if((start + n) < mtd->oobblock)
+               {
+                       nToCopy = n;
+               }
+               else
+               {
+                       nToCopy =  mtd->oobblock - start;
+               }
+
+               nandemul2k_Program(buf, page, start, nToCopy);
+               nandemul2k_Program(oob_buf, page, PAGE_DATA_SIZE, PAGE_SPARE_SIZE);
+
+               n -= nToCopy;
+               to += nToCopy;
+               buf += nToCopy;
+               if(oob_buf) oob_buf += PAGE_SPARE_SIZE;
+               *retlen += nToCopy;
+
+       }
+
+
+       return 0;
+}
+
+/*
+ * NAND write out-of-band
+ */
+static int nand_write_oob (struct mtd_info *mtd, loff_t to, size_t len,
+                               size_t *retlen, const u_char *buf)
+{
+       int col, page;
+
+
+       T(0,(
+               "nand_read_oob: to = 0x%08x, len = %i\n", (unsigned int) to,
+               (int) len));
+
+       /* Shift to get page */
+       page = ((int) to) >> NAND_SHIFT;
+
+       /* Mask to get column */
+       col = to & 0x0f;
+
+       /* Initialize return length value */
+       *retlen = 0;
+
+       /* Do not allow reads past end of device */
+       if ((to + len) > mtd->size) {
+               T(0,(
+                  "nand_read_oob: Attempt read beyond end of device\n"));
+               *retlen = 0;
+               return -EINVAL;
+       }
+
+       nandemul2k_Program(buf,page,512 + col,len);
+
+       /* Return happy */
+       *retlen = len;
+       return 0;
+
+}
+
+/*
+ * NAND write with iovec
+ */
+static int nand_writev (struct mtd_info *mtd, const struct iovec *vecs,
+                               unsigned long count, loff_t to, size_t *retlen)
+{
+       return -EINVAL;
+}
+
+/*
+ * NAND erase a block
+ */
+static int nand_erase (struct mtd_info *mtd, struct erase_info *instr)
+{
+       int i, nBlocks,block;
+
+       T(0,(
+               "nand_erase: start = 0x%08x, len = %i\n",
+               (unsigned int) instr->addr, (unsigned int) instr->len));
+
+       /* Start address must align on block boundary */
+       if (instr->addr & (mtd->erasesize - 1)) {
+               T(0,(
+                       "nand_erase: Unaligned address\n"));
+               return -EINVAL;
+       }
+
+       /* Length must align on block boundary */
+       if (instr->len & (mtd->erasesize - 1)) {
+               T(0,(
+                       "nand_erase: Length not block aligned\n"));
+               return -EINVAL;
+       }
+
+       /* Do not allow erase past end of device */
+       if ((instr->len + instr->addr) > mtd->size) {
+               T(0,(
+                       "nand_erase: Erase past end of device\n"));
+               return -EINVAL;
+       }
+
+       nBlocks = instr->len >> (NAND_SHIFT + 5);
+       block = instr->addr >> (NAND_SHIFT + 5);
+
+       for(i = 0; i < nBlocks; i++)
+       {
+               nandemul2k_DoErase(block);
+               block++;
+       }
+
+
+
+       return 0;
+
+
+}
+
+
+int nand_block_isbad(struct mtd_info *mtd,int blockNo)
+{
+       return 0;
+}
+
+int nand_block_markbad(struct mtd_info *mtd, int blockNo)
+{
+       return 0;
+}
+
+
+/*
+ * NAND sync
+ */
+static void nand_sync (struct mtd_info *mtd)
+{
+       T(0,("nand_sync: called\n"));
+
+}
+
+/*
+ * Scan for the NAND device
+ */
+int nand_scan (struct mtd_info *mtd,int nchips)
+{
+       mtd->oobblock = PAGE_DATA_SIZE;
+       mtd->oobsize =  PAGE_SPARE_SIZE;
+       mtd->erasesize = PAGE_DATA_SIZE * PAGES_PER_BLOCK;
+       mtd->size = sizeInMB * 1024*1024;
+
+
+
+       /* Fill in remaining MTD driver data */
+       mtd->type = MTD_NANDFLASH;
+       mtd->flags = MTD_CAP_NANDFLASH;
+       mtd->owner = THIS_MODULE;
+       mtd->ecctype = MTD_ECC_NONE;
+       mtd->erase = nand_erase;
+       mtd->point = NULL;
+       mtd->unpoint = NULL;
+       mtd->read = nand_read;
+       mtd->write = nand_write;
+       mtd->read_ecc = nand_read_ecc;
+       mtd->write_ecc = nand_write_ecc;
+       mtd->read_oob = nand_read_oob;
+       mtd->write_oob = nand_write_oob;
+       mtd->block_isbad = nand_block_isbad;
+       mtd->block_markbad = nand_block_markbad;
+       mtd->readv = NULL;
+       mtd->writev = nand_writev;
+       mtd->sync = nand_sync;
+       mtd->lock = NULL;
+       mtd->unlock = NULL;
+       mtd->suspend = NULL;
+       mtd->resume = NULL;
+
+       /* Return happy */
+       return 0;
+}
+
+#if 0
+#ifdef MODULE
+MODULE_PARM(sizeInMB, "i");
+
+__setup("sizeInMB=",sizeInMB);
+#endif
+#endif
+
+/*
+ * Define partitions for flash devices
+ */
+
+static struct mtd_partition nandemul2k_partition[] =
+{
+       { name: "NANDemul partition 1",
+         offset:  0,
+         size: 0 },
+};
+
+static int nPartitions = sizeof(nandemul2k_partition)/sizeof(nandemul2k_partition[0]);
+
+/*
+ * Main initialization routine
+ */
+int __init nandemul2k_init (void)
+{
+
+       // Do the nand init
+       
+       CheckInit();
+
+       nand_scan(&nandemul2k_mtd,1);
+
+       // Build the partition table
+
+       nandemul2k_partition[0].size = sizeInMB * 1024 * 1024;
+
+       // Register the partition
+       add_mtd_partitions(&nandemul2k_mtd,nandemul2k_partition,nPartitions);
+
+       return 0;
+
+}
+
+module_init(nandemul2k_init);
+
+/*
+ * Clean up routine
+ */
+#ifdef MODULE
+static void __exit nandemul2k_cleanup (void)
+{
+
+       nandemul2k_CleanUp();
+
+       /* Unregister partitions */
+       del_mtd_partitions(&nandemul2k_mtd);
+
+       /* Unregister the device */
+       del_mtd_device (&nandemul2k_mtd);
+
+}
+module_exit(nandemul2k_cleanup);
+#endif
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Charles Manning <manningc@aleph1.co.uk>");
+MODULE_DESCRIPTION("2k Page/128k Block NAND emulated in RAM");
+
+
+
+
diff --git a/yaffs_fs.c b/yaffs_fs.c
new file mode 100644 (file)
index 0000000..f25bccc
--- /dev/null
@@ -0,0 +1,1915 @@
+/*
+ * YAFFS: Yet another FFS. A NAND-flash specific file system.
+ * yaffs_fs.c
+ *
+ * Copyright (C) 2002 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * 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: 
+ * >> sb->u.generic_sbp points to the yaffs_Device associated with this superblock
+ * >> inode->u.generic_ip points to the associated yaffs_Object.
+ *
+ *
+ * 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 JFFS2.
+ */
+
+
+const char *yaffs_fs_c_version = "$Id: yaffs_fs.c,v 1.1 2004-12-17 04:39:04 charles Exp $";
+extern const char *yaffs_guts_c_version;
+
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/fs.h>
+#include <linux/proc_fs.h>
+#include <linux/pagemap.h>
+#include <linux/mtd/mtd.h>
+#include <linux/interrupt.h>
+#include <linux/string.h>
+
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
+
+#include <linux/statfs.h>      /* Added NCB 15-8-2003 */
+#include <asm/statfs.h>
+#define UnlockPage(p) unlock_page(p)
+#define Page_Uptodate(page)    test_bit(PG_uptodate, &(page)->flags)
+//#define kdevname(x) cdevname(to_kdev_t(x))
+#define kdevname(x) "(unavailable)"    // temporary fix
+
+#else
+
+#include <linux/locks.h>
+
+#endif
+
+
+#include <asm/uaccess.h>
+
+#include "yportenv.h"
+#include "yaffs_guts.h"
+
+
+
+
+//unsigned yaffs_traceMask = YAFFS_TRACE_ALWAYS | YAFFS_TRACE_BAD_BLOCKS;
+unsigned yaffs_traceMask = 0xFFFFFFFF;
+
+
+#ifdef CONFIG_YAFFS_RAM_ENABLED
+#include "yaffs_nandemul.h" 
+// 2 MB of RAM for emulation
+#define YAFFS_RAM_EMULATION_SIZE  0x200000
+#endif //CONFIG_YAFFS_RAM_ENABLED
+
+#if CONFIG_YAFFS2_RAM_ENABLED
+#include "yaffs_nandemul2k.h"
+#endif
+
+#ifdef CONFIG_YAFFS_MTD_ENABLED
+#include <linux/mtd/mtd.h>
+#include "yaffs_mtdif.h"
+#include "yaffs_mtdif2.h"
+#endif //CONFIG_YAFFS_MTD_ENABLED
+
+//#define T(x) printk x
+
+
+
+#define yaffs_InodeToObject(iptr) ((yaffs_Object *)((iptr)->u.generic_ip))
+#define yaffs_DentryToObject(dptr) yaffs_InodeToObject((dptr)->d_inode)
+//NCB #define yaffs_SuperToDevice(sb)  ((yaffs_Device *)sb->u.generic_sbp)
+
+//#if defined(CONFIG_KERNEL_2_5)
+#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
+
+
+static void yaffs_put_super(struct super_block *sb);
+
+#if 0
+static ssize_t yaffs_file_read(struct file *f, char *buf, size_t n, loff_t *pos);
+#endif
+
+static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, loff_t *pos);
+
+static int yaffs_file_flush(struct file* file);
+
+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 defined(CONFIG_KERNEL_2_5)       /* Added NCB 185-8-2003 */
+#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 defined(CONFIG_KERNEL_2_5)
+#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 defined(CONFIG_KERNEL_2_5)       /* Added NCB 185-8-2003 */
+#if (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
+static void yaffs_read_inode (struct inode *inode);
+
+//#if defined(CONFIG_KERNEL_2_5)
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
+static struct super_block *yaffs_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data);
+#else
+static struct super_block *yaffs_read_super(struct super_block * sb, void * data, int silent);
+#endif
+
+static void yaffs_put_inode (struct inode *inode);
+static void yaffs_delete_inode(struct inode *);
+static void yaffs_clear_inode(struct inode *);
+
+static int yaffs_readpage(struct file *file, struct page * page);
+static int yaffs_writepage(struct page *page);
+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);
+
+static int yaffs_readlink(struct dentry *dentry, char *buffer, int buflen);
+static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
+
+
+
+
+static struct address_space_operations yaffs_file_address_operations = {
+       readpage:               yaffs_readpage,
+       writepage:              yaffs_writepage,
+       prepare_write:  yaffs_prepare_write,
+       commit_write:   yaffs_commit_write
+};
+
+
+static 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,
+};
+
+
+static struct inode_operations yaffs_file_inode_operations = {
+       setattr:        yaffs_setattr,
+};
+
+
+struct inode_operations yaffs_symlink_inode_operations =
+{      
+       readlink:       yaffs_readlink,
+       follow_link:    yaffs_follow_link,
+       setattr:        yaffs_setattr
+};
+
+static 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 struct file_operations yaffs_dir_operations = {
+       read:           generic_read_dir,
+       readdir:        yaffs_readdir,
+       fsync:          yaffs_sync_object,
+};
+
+
+static struct super_operations yaffs_super_ops = {
+       statfs:                 yaffs_statfs,
+       read_inode:             yaffs_read_inode,
+       put_inode:              yaffs_put_inode,
+       put_super:              yaffs_put_super,
+//     remount_fs:
+       delete_inode:           yaffs_delete_inode,
+       clear_inode:            yaffs_clear_inode,
+};
+
+
+
+static void yaffs_GrossLock(yaffs_Device *dev)
+{
+       T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs locking\n"));
+
+       down(&dev->grossLock);
+}
+
+static void yaffs_GrossUnlock(yaffs_Device *dev)
+{
+       T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs unlocking\n"));
+       up(&dev->grossLock);
+
+}
+
+static int yaffs_readlink(struct dentry *dentry, char *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;
+}
+
+static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
+{
+       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_follow_link(nd,alias);
+       kfree(alias);
+       return ret;
+}
+
+
+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 defined(CONFIG_KERNEL_2_5)       /* Added NCB 185-8-2003 */
+#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,(KERN_DEBUG"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
+       
+
+       
+       if(obj)
+       {
+               T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_lookup found %d\n",obj->objectId));
+               
+               inode = yaffs_get_inode(dir->i_sb, obj->st_mode,0,obj);
+               
+               if(inode)
+               {
+                       T(YAFFS_TRACE_OS,(KERN_DEBUG"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);
+                       
+                       yaffs_GrossUnlock(dev);
+
+                       // return dentry;
+                       return NULL;
+#endif
+               }
+
+       }
+       else
+       {
+               T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_lookup not found\n"));
+               
+       }
+       yaffs_GrossUnlock(dev);
+
+/* added NCB for 2.5/6 compatability - forces add even if inode is NULL which creates dentry hash*/    
+       d_add(dentry,inode);
+       
+       return NULL;
+       //      return (ERR_PTR(-EIO));
+       
+}
+
+// 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)));
+       
+}
+
+// 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 ant the yaffs_Object.
+               obj->myInode = NULL;
+               inode->u.generic_ip = 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_DeleteFile(obj);
+               yaffs_GrossUnlock(dev);
+       }
+       clear_inode(inode);
+}
+
+
+static int yaffs_file_flush(struct file* file)
+{
+       yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry);
+       
+       yaffs_Device *dev = obj->myDev;
+       
+       T(YAFFS_TRACE_OS,(KERN_DEBUG"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;
+}
+
+
+
+static int yaffs_readpage_nolock(struct file *f, struct page * pg)
+{
+       // Lifted from jffs2
+       
+       yaffs_Object *obj;
+       unsigned char *pg_buf;
+       int ret;
+
+       yaffs_Device *dev;
+
+       T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readpage at %08x, size %08x\n",
+                     (unsigned)(pg->index << PAGE_CACHE_SHIFT), (unsigned)PAGE_CACHE_SIZE));
+
+       obj  = yaffs_DentryToObject(f->f_dentry);
+
+       dev = obj->myDev;
+       
+       
+       if (!PageLocked(pg))
+                PAGE_BUG(pg);
+
+       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,(KERN_DEBUG"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
+//
+
+static int yaffs_writepage(struct page *page)
+{
+       struct address_space *mapping = page->mapping;
+       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();
+
+       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);
+       }
+       //  What's happening here?
+       ///* OK, are we completely out? */
+       //if (page->index >= end_index+1 || !offset)
+       //      return -EIO;
+
+       get_page(page);
+
+
+       buffer = kmap(page);
+
+       obj = yaffs_InodeToObject(inode);
+       yaffs_GrossLock(obj->myDev);
+
+
+       nWritten = yaffs_WriteDataToFile(obj,buffer,page->index << PAGE_CACHE_SHIFT,nBytes);
+
+       yaffs_GrossUnlock(obj->myDev);
+       
+       kunmap(page);
+       SetPageUptodate(page);
+       UnlockPage(page);
+       put_page(page);
+
+       return (nWritten == nBytes) ? 0  : -ENOSPC;
+}
+
+
+
+static int yaffs_prepare_write(struct file *f, struct page *pg, unsigned offset, unsigned to)
+{
+
+       T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_prepair_write\n"));
+       if(!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
+               return  yaffs_readpage_nolock(f,pg);    
+
+       return 0;
+       
+}
+
+static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset, unsigned to)
+{
+
+       void *addr = page_address(pg) + offset;
+       loff_t pos = (((loff_t)pg->index) << PAGE_CACHE_SHIFT) + offset;
+       int nBytes = to - offset;
+       int nWritten;
+       
+       unsigned spos = pos;
+       unsigned saddr = (unsigned)addr;
+
+       T(YAFFS_TRACE_OS,(KERN_DEBUG"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,(KERN_DEBUG"yaffs_commit_write not same size nWritten %d  nBytes %d\n",nWritten,nBytes));
+               SetPageError(pg);
+               ClearPageUptodate(pg);
+       }
+       else
+       {
+               SetPageUptodate(pg);
+       }
+
+       T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_commit_write returning %d\n",nWritten));
+       
+       return nWritten;
+
+}
+
+
+
+static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object *obj)
+{
+       if (inode && obj) 
+       {
+               inode->i_ino = obj->objectId;
+               inode->i_mode = obj->st_mode;
+               inode->i_uid = obj->st_uid;
+               inode->i_gid = obj->st_gid;
+               inode->i_blksize = inode->i_sb->s_blocksize;
+//#if defined(CONFIG_KERNEL_2_5)
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
+
+               inode->i_rdev = old_decode_dev(obj->st_rdev);
+               inode->i_atime.tv_sec = (time_t)(obj->st_atime);
+               inode->i_atime.tv_nsec = 0;
+               inode->i_mtime.tv_sec = (time_t)obj->st_mtime;
+               inode->i_mtime.tv_nsec =0;
+               inode->i_ctime.tv_sec = (time_t)obj->st_ctime;
+               inode->i_ctime.tv_nsec = 0;
+#else
+               inode->i_rdev = obj->st_rdev;
+               inode->i_atime = obj->st_atime;
+               inode->i_mtime = obj->st_mtime;
+               inode->i_ctime = obj->st_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,(KERN_DEBUG"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->st_mode & S_IFMT) 
+               {
+                       default: // fifo, device or socket
+                               init_special_inode(inode, obj->st_mode,(dev_t)(obj->st_rdev));
+                               break;
+                       case S_IFREG:   // file         
+                               inode->i_op = &yaffs_file_inode_operations;
+                               inode->i_fop = &yaffs_file_operations;
+                               inode->i_mapping->a_ops = &yaffs_file_address_operations;
+                               break;
+                       case S_IFDIR:   // directory
+                               inode->i_op = &yaffs_dir_inode_operations;
+                               inode->i_fop = &yaffs_dir_operations;
+                               break;
+                       case S_IFLNK:   // symlink
+                               inode->i_op = &yaffs_symlink_inode_operations;
+                               break;
+               }
+               
+               
+               inode->u.generic_ip = obj;
+               obj->myInode = inode;
+               
+       }
+       else
+       {
+               T(YAFFS_TRACE_OS,(KERN_DEBUG"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,(KERN_DEBUG"yaffs_get_inode for NULL super_block!!\n"));
+         return NULL;
+         
+       }
+       
+       if(!obj)
+       {
+         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_get_inode for NULL object!!\n"));
+         return NULL;
+         
+       }
+       
+       T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_get_inode for object %d\n",obj->objectId));
+
+       inode = iget(sb,obj->objectId);
+
+       // NB Side effect: iget calls back to yaffs_read_inode().
+       // iget also increments the inode's i_count
+       
+       return inode;
+}
+
+#if 0
+
+// No longer used because we use generic rw */
+static ssize_t yaffs_file_read(struct file *f, char *buf, size_t n, loff_t *pos)
+{
+       yaffs_Object *obj;
+       int nRead,ipos;
+       struct inode *inode;
+       yaffs_Device *dev;
+       
+       T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_read\n"));
+
+       obj  = yaffs_DentryToObject(f->f_dentry);
+       
+       dev = obj->myDev;
+       
+       yaffs_GrossLock(dev);
+       
+       inode = f->f_dentry->d_inode;
+       
+       if (*pos < inode->i_size) 
+       {
+                       if (*pos + n > inode->i_size)
+                       {
+                               n = inode->i_size - *pos;
+                       }
+       }
+       else
+       {
+               n = 0;
+       }
+       
+       nRead = yaffs_ReadDataFromFile(obj,buf,*pos,n);
+       if(nRead > 0)
+       {
+               f->f_pos += nRead;
+       }
+       
+       yaffs_GrossUnlock(dev);
+       
+       ipos = *pos;
+       
+       T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_read read %d bytes, %d read at %d\n",n,nRead,ipos));
+       return nRead;
+       
+}
+
+#endif
+
+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,(KERN_DEBUG"yaffs_file_write: hey obj is null!\n"));
+       }
+       else
+       {
+               T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write about to write writing %d bytes to object %d at %d\n",n,obj->objectId,ipos));
+       }
+
+       nWritten = yaffs_WriteDataToFile(obj,buf,ipos,n);
+
+       T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write writing %d 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,(KERN_DEBUG"yaffs_file_write size updated to %d bytes, %d blocks\n",ipos,(int)(inode->i_blocks)));
+               }
+               
+       }
+       yaffs_GrossUnlock(dev);
+       
+       return nWritten != n ? -ENOSPC : nWritten;
+}
+
+
+
+static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
+{
+       yaffs_Object *obj;
+       yaffs_Device *dev;
+       struct inode *inode = f->f_dentry->d_inode;
+       unsigned long offset, curoffs;
+       struct list_head *i;    
+       yaffs_Object *l;
+       
+       char name[YAFFS_MAX_NAME_LENGTH +1];
+               
+       obj =  yaffs_DentryToObject(f->f_dentry);
+       dev = obj->myDev;
+       
+       yaffs_GrossLock(dev);
+       
+       offset = f->f_pos;
+       
+       T(YAFFS_TRACE_OS,("yaffs_readdir: starting at %d\n",(int)offset));
+       
+       if(offset == 0)
+       {
+        T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: entry . ino %d \n",(int)inode->i_ino));
+               if(filldir(dirent,".",1,offset,inode->i_ino,DT_DIR) < 0)
+               {
+                       goto out;
+               }
+               offset++;
+               f->f_pos++;
+       }
+       if(offset == 1)
+       {
+               T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: entry .. ino %d \n",(int)f->f_dentry->d_parent->d_inode->i_ino));
+               if(filldir(dirent,"..",2,offset,f->f_dentry->d_parent->d_inode->i_ino,DT_DIR) < 0)
+               {
+                       goto out;
+               }
+               offset++;
+               f->f_pos++;
+       }
+       
+       curoffs = 1;
+       
+       list_for_each(i,&obj->variant.directoryVariant.children)
+       {
+               curoffs++;
+               if(curoffs >= offset)
+               {               
+                       l = list_entry(i, yaffs_Object,siblings);
+                       
+                       yaffs_GetObjectName(l,name,YAFFS_MAX_NAME_LENGTH+1); 
+                       T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: %s inode %d\n",name,yaffs_GetObjectInode(l)));
+                       
+                       if(filldir(dirent,
+                                          name,
+                                          strlen(name),
+                                          offset,
+                                          yaffs_GetObjectInode(l),
+                                          yaffs_GetObjectType(l))
+                                          < 0)
+                       {
+                               goto up_and_out;
+                       }
+                       
+                       offset++;
+                       f->f_pos++;        
+               }
+       }
+
+  up_and_out:
+  out:
+  
+    yaffs_GrossUnlock(dev);
+    
+       return 0;
+}
+
+
+/*
+ * File creation. Allocate an inode, and we're done..
+ */
+//#if defined(CONFIG_KERNEL_2_5)
+#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;
+
+       if(parent)
+       {
+               T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: parent object %d type %d\n",
+                                        parent->objectId,parent->variantType));
+       }
+       else
+       {
+               T(YAFFS_TRACE_OS,(KERN_DEBUG"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,(KERN_DEBUG"yaffs_mknod: making special\n"));
+                       obj = yaffs_MknodSpecial(parent,dentry->d_name.name,mode,current->uid, current->gid,rdev);
+                       break;
+               case S_IFREG:   // file         
+                       T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making file\n"));
+                       obj = yaffs_MknodFile(parent,dentry->d_name.name,mode,current->uid, current->gid);
+                       break;
+               case S_IFDIR:   // directory
+                       T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making directory\n"));
+                       obj = yaffs_MknodDirectory(parent,dentry->d_name.name,mode,current->uid, current->gid);
+                       break;
+               case S_IFLNK:   // symlink
+                       T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making file\n"));
+                       obj = NULL; // Do we ever get here?
+                       break;
+       }
+       
+       if(obj)
+       {
+               inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
+               d_instantiate(dentry, inode);
+               T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod created object %d count = %d\n",obj->objectId,atomic_read(&inode->i_count)));
+               error = 0;
+       }
+       else
+       {
+               T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod failed making object\n"));
+               error = -ENOMEM;
+       }
+
+       yaffs_GrossUnlock(dev);
+
+       return error;
+}
+
+static int yaffs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
+{
+       int retVal;
+       T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mkdir\n"));
+       retVal =  yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
+#if 0
+ // attempt to fix dir bug - didn't work
+       if(!retVal)
+       {
+               dget(dentry);
+       }
+#endif
+       return retVal;
+}
+
+//#if defined(CONFIG_KERNEL_2_5)       /* Added NCB 185-8-2003 */
+#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,(KERN_DEBUG"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,(KERN_DEBUG"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);
+       
+       
+       yaffs_GrossUnlock(dev);
+       
+       if( retVal == YAFFS_OK)
+       {
+               dentry->d_inode->i_nlink--;
+               mark_inode_dirty(dentry->d_inode);
+               return 0;
+       }
+       else
+       {
+               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,(KERN_DEBUG"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,(KERN_DEBUG"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)
+       {
+       
+               return 0;
+       }
+       
+       
+       return -EPERM; 
+}
+
+
+static int yaffs_symlink(struct inode * dir, struct dentry *dentry, const char * symname)
+{
+       yaffs_Object *obj;
+       yaffs_Device *dev;
+       
+       T(YAFFS_TRACE_OS,(KERN_DEBUG"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, current->uid, current->gid,
+                                                        symname);
+       yaffs_GrossUnlock(dev);
+
+       if(obj)
+       {
+
+               struct inode* inode;
+       
+               inode = yaffs_get_inode(dir->i_sb, obj->st_mode, 0, obj);
+               d_instantiate(dentry, inode);
+               T(YAFFS_TRACE_OS,(KERN_DEBUG"symlink created OK\n"));
+               return 0;
+       }
+       else
+       {
+               T(YAFFS_TRACE_OS,(KERN_DEBUG"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,(KERN_DEBUG"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;
+       int removed = 0;
+       yaffs_Object *target;
+       
+       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 &&
+          !list_empty(&target->variant.directoryVariant.children))
+       {
+               retVal = YAFFS_FAIL;
+       }
+       else
+       {
+          
+               // Unlink the target if it exists
+               removed = yaffs_Unlink(yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
+
+       
+               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(removed == YAFFS_OK)
+               {
+                       new_dentry->d_inode->i_nlink--;
+                       mark_inode_dirty(new_dentry->d_inode);
+               }
+               
+               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,(KERN_DEBUG"yaffs_setattr of object %d\n",yaffs_InodeToObject(inode)->objectId));
+       
+       if((error = inode_change_ok(inode,attr)) == 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);
+               inode_setattr(inode,attr);
+       }
+       return error;
+}
+
+//#if defined(CONFIG_KERNEL_2_5)       /* Added NCB 185-8-2003 */
+#if (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
+{
+       yaffs_Device *dev = yaffs_SuperToDevice(sb);
+       T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_statfs\n"));
+
+       yaffs_GrossLock(dev);
+       
+       buf->f_type = YAFFS_MAGIC;
+       buf->f_bsize = sb->s_blocksize;
+       buf->f_namelen = 255;
+       buf->f_blocks = (dev->endBlock - dev->startBlock + 1) * YAFFS_CHUNKS_PER_BLOCK/
+                                               (sb->s_blocksize/YAFFS_BYTES_PER_CHUNK);
+       buf->f_files = 0;
+       buf->f_ffree = 0;
+       buf->f_bfree = yaffs_GetNumberOfFreeChunks(dev)/
+                                               (sb->s_blocksize/YAFFS_BYTES_PER_CHUNK);
+       buf->f_bavail =  buf->f_bfree;
+       
+       yaffs_GrossUnlock(dev);
+       return 0;
+}
+
+static void yaffs_read_inode (struct inode *inode)
+{
+       // NB This is called as a side effect of other functions and
+       // thus gross locking should always be in place already.
+       
+       yaffs_Object *obj ; 
+       yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
+       
+       T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_read_inode for %d\n",(int)inode->i_ino));
+
+       obj  = yaffs_FindObjectByNumber(dev,inode->i_ino);
+       
+       yaffs_FillInodeFromObject(inode,obj);
+
+}
+
+
+
+// Todo
+// Currently we only can report a single partition. Need to use lists here
+static yaffs_Device *yaffs_dev;
+static yaffs_Device *yaffsram_dev;
+
+
+
+static void yaffs_put_super(struct super_block *sb)
+{
+       yaffs_Device *dev = yaffs_SuperToDevice(sb);
+       
+       yaffs_GrossLock(dev);
+       if(dev->putSuperFunc)
+       {
+                dev->putSuperFunc(sb);
+       }
+       yaffs_Deinitialise(dev);
+       yaffs_GrossUnlock(dev);
+
+       if(dev == yaffs_dev) yaffs_dev = NULL;
+       if(dev == yaffsram_dev) yaffsram_dev = NULL;
+               
+       kfree(dev);
+}
+
+
+#ifdef CONFIG_YAFFS_MTD_ENABLED
+
+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);
+}
+
+#endif
+
+
+static struct super_block *yaffs_internal_read_super(int yaffsVersion,int useRam, struct super_block * sb, void * data, int silent)
+{
+       int nBlocks;
+       struct inode * inode = NULL;
+       struct dentry * root;
+       yaffs_Device *dev;
+       int err;
+       
+       sb->s_magic = YAFFS_MAGIC;
+       sb->s_op = &yaffs_super_ops;
+       
+       if(!sb)
+               printk(KERN_INFO"yaffs: sb is NULL\n");
+       else if(!sb->s_dev)
+               printk(KERN_INFO"yaffs: sb->s_dev is NULL\n");
+       else if(! kdevname(sb->s_dev))
+               printk(KERN_INFO"yaffs: kdevname is NULL\n");
+       else
+               printk(KERN_INFO"yaffs: dev is %d name is \"%s\"\n", sb->s_dev, kdevname(sb->s_dev));
+
+       
+
+#ifdef CONFIG_YAFFS_USE_CHUNK_SIZE
+       sb->s_blocksize = YAFFS_BYTES_PER_CHUNK;
+       sb->s_blocksize_bits = YAFFS_CHUNK_SIZE_SHIFT;
+#else
+       sb->s_blocksize = PAGE_CACHE_SIZE;
+       sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
+#endif
+       T(YAFFS_TRACE_OS,("yaffs_read_super: Using yaffs%d\n",yaffsVersion));
+       T(YAFFS_TRACE_OS,("yaffs_read_super: %s block size %d\n", useRam ? "RAM" : "MTD",(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
+
+
+       
+       if(useRam)
+       {
+
+#ifdef CONFIG_YAFFS_RAM_ENABLED
+               // Set the yaffs_Device up for ram emulation
+
+               sb->u.generic_sbp = dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
+               if(!dev)
+               {
+                       // Deep shit could not allocate device structure
+                       T(YAFFS_TRACE_OS,("yaffs_read_super: Failed trying to allocate yaffs_Device.\n"));
+                       return NULL;
+               }
+
+               memset(dev,0,sizeof(yaffs_Device));
+               dev->genericDevice = NULL; // Not used for RAM emulation.
+
+               nBlocks = YAFFS_RAM_EMULATION_SIZE / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
+               dev->startBlock = 1;  // Don't use block 0
+               dev->endBlock = nBlocks - 1;
+               dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
+               dev->nBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
+               dev->nReservedBlocks = 5;
+               
+               if(yaffsVersion == 2)
+               {
+                       dev->writeChunkWithTagsToNAND  = nandemul2k_WriteChunkWithTagsToNAND;
+                       dev->readChunkWithTagsFromNAND = nandemul2k_ReadChunkWithTagsFromNAND;
+                       dev->markNANDBlockBad          = nandemul2k_MarkNANDBlockBad;
+                       dev->queryNANDBlock            = nandemul2k_QueryNANDBlock;
+                       dev->eraseBlockInNAND          = nandemul2k_EraseBlockInNAND;
+                       dev->initialiseNAND            = nandemul2k_InitialiseNAND;
+                       dev->isYaffs2 = 1;
+                       dev->nChunksPerBlock = nandemul2k_GetChunksPerBlock();
+                       dev->nBytesPerChunk =  nandemul2k_GetBytesPerChunk();;
+                       nBlocks = nandemul2k_GetNumberOfBlocks();
+                       dev->startBlock = 1;  // Don't use block 0
+                       dev->endBlock = nBlocks - 1;
+               }
+               else
+               {
+                       dev->writeChunkToNAND = nandemul_WriteChunkToNAND;
+                       dev->readChunkFromNAND = nandemul_ReadChunkFromNAND;
+                       dev->eraseBlockInNAND = nandemul_EraseBlockInNAND;
+                       dev->initialiseNAND = nandemul_InitialiseNAND;
+                       dev->isYaffs2 = 0;
+               }
+               
+               yaffsram_dev = dev;
+               
+#endif
+
+       }
+       else
+       {       
+#ifdef CONFIG_YAFFS_MTD_ENABLED
+               struct mtd_info *mtd;
+               
+               T(YAFFS_TRACE_ALWAYS,("yaffs: Attempting MTD mount on %u.%u, \"%s\"\n",
+                MAJOR(sb->s_dev),MINOR(sb->s_dev),kdevname(sb->s_dev)));
+                       
+               // 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 %x\n",mtd->erase));
+               T(YAFFS_TRACE_OS,(" read %x\n",mtd->read));
+               T(YAFFS_TRACE_OS,(" write %x\n",mtd->write));
+               T(YAFFS_TRACE_OS,(" readoob %x\n",mtd->read_oob));
+               T(YAFFS_TRACE_OS,(" writeoob %x\n",mtd->write_oob));
+               T(YAFFS_TRACE_OS,(" block_isbad %x\n",mtd->block_isbad));
+               T(YAFFS_TRACE_OS,(" block_markbad %x\n",mtd->block_markbad));
+               T(YAFFS_TRACE_OS,(" oobblock %d\n",mtd->oobblock));
+               T(YAFFS_TRACE_OS,(" oobsize %d\n",mtd->oobsize));
+               T(YAFFS_TRACE_OS,(" erasesize %d\n",mtd->erasesize));
+               T(YAFFS_TRACE_OS,(" size %d\n",mtd->size));
+
+               if(yaffsVersion == 2)
+               {
+                       // Check for version 2 style functions
+                       if(!mtd->erase ||
+                          !mtd->block_isbad ||
+                          !mtd->block_markbad ||
+                          !mtd->read  ||
+                          !mtd->write ||
+#ifndef CONFIG_YAFFS_USE_OLD_MTD
+                          !mtd->write_ecc ||
+                          !mtd->read_ecc ||
+#endif
+                          !mtd->read_oob ||
+                          !mtd->write_oob )
+                       {
+                               T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device does not support required functions\n"));;
+                               return NULL;
+                       }
+               
+                       if(mtd->oobblock < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
+                          mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE)
+                       {
+                               T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device does not support have the right page sizes\n"));
+                               return NULL;
+                       }               }
+               else
+               {
+                       // Check for V1 style functions
+                       if(!mtd->erase ||
+                          !mtd->read  ||
+                          !mtd->write ||
+#ifndef CONFIG_YAFFS_USE_OLD_MTD
+                          !mtd->write_ecc ||
+                          !mtd->read_ecc ||
+#endif
+                          !mtd->read_oob ||
+                          !mtd->write_oob )
+                       {
+                               T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device does not support required functions\n"));;
+                               return NULL;
+                       }
+               
+                       if(mtd->oobblock != 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 defined(CONFIG_KERNEL_2_5)
+#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; 
+
+               // Set up the memory size parameters....
+               
+               nBlocks = mtd->size / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
+               dev->startBlock = 1;  // Don't use block 0
+               dev->endBlock = nBlocks - 1;
+               dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
+               dev->nBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
+               dev->nReservedBlocks = 5;
+               dev->nShortOpCaches = 10; // Enable short op caching
+               
+
+               // ... 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;
+                       dev->nBytesPerChunk = mtd->oobblock;
+                       dev->nChunksPerBlock = mtd->erasesize / mtd->oobblock;
+                       nBlocks = mtd->size / mtd->erasesize;
+                       dev->startBlock = 1;  // Don't use block 0
+                       dev->endBlock = nBlocks - 1;
+               }
+               else
+               {
+                       dev->writeChunkToNAND = nandmtd_WriteChunkToNAND;
+                       dev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
+                       dev->isYaffs2 = 0;
+               }
+               // ... and common functions
+               dev->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
+               dev->initialiseNAND = nandmtd_InitialiseNAND;
+               
+               dev->putSuperFunc = yaffs_MTDPutSuper;
+               
+#ifdef CONFIG_YAFFS_USE_NANDECC
+               dev->useNANDECC = 1;
+#endif
+
+               yaffs_dev = dev;
+               
+#endif
+       }
+
+       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"));
+
+       // Create root inode
+       if(err == YAFFS_OK)
+         inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,yaffs_Root(dev));
+
+       yaffs_GrossUnlock(dev);
+
+       if (!inode)
+               return NULL;
+               
+// added NCB
+       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;
+
+       T(YAFFS_TRACE_OS,("yaffs_read_super: done\n"));
+       return sb;
+}
+
+
+static int yaffs_internal_read_super_ram(struct super_block * sb, void * data, int silent)
+{
+        return yaffs_internal_read_super(1,1,sb,data,silent) ? 0 : -1;
+}
+static int yaffs_internal_read_super_mtd(struct super_block * sb, void * data, int silent)
+{
+        return yaffs_internal_read_super(1,0,sb,data,silent) ? 0 : -1;
+}
+
+static int yaffs2_internal_read_super_ram(struct super_block * sb, void * data, int silent)
+{
+        return yaffs_internal_read_super(2,1,sb,data,silent) ? 0 : -1;
+}
+static int yaffs2_internal_read_super_mtd(struct super_block * sb, void * data, int silent)
+{
+        return yaffs_internal_read_super(2,0,sb,data,silent) ? 0 : -1;
+}
+
+
+
+#ifdef CONFIG_YAFFS_MTD_ENABLED
+//#if defined(CONFIG_KERNEL_2_5)
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
+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);
+}
+
+/* changes NCB 2.5.70 */
+//static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
+static struct file_system_type yaffs_fs_type = {
+       .owner          = THIS_MODULE,
+       .name           = "yaffs",
+       .get_sb         = yaffs_read_super,
+//     .kill_sb        = kill_block_super,
+       .kill_sb        = kill_litter_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(1,0,sb,data,silent);
+}
+
+static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
+#endif
+
+#endif // CONFIG_YAFFS_MTD_ENABLED
+
+#ifdef CONFIG_YAFFS2_MTD_ENABLED
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
+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);
+}
+
+/* changes NCB 2.5.70 */
+//static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
+static struct file_system_type yaffs2_fs_type = {
+       .owner          = THIS_MODULE,
+       .name           = "yaffs2",
+       .get_sb         = yaffs2_read_super,
+//     .kill_sb        = kill_block_super,
+       .kill_sb        = kill_litter_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(2,0,sb,data,silent);
+}
+
+static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super, FS_REQUIRES_DEV);
+#endif
+
+#endif // CONFIG_YAFFS2_MTD_ENABLED
+
+
+#ifdef CONFIG_YAFFS_RAM_ENABLED
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
+static struct super_block *yaffs_ram_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_ram);
+}
+
+
+static struct file_system_type yaffs_ram_fs_type = {
+       .owner          = THIS_MODULE,
+       .name           = "yaffsram",
+       .get_sb         = yaffs_ram_read_super,
+//     .kill_sb        = kill_block_super,
+       .kill_sb        = kill_litter_super,
+       .fs_flags       = FS_SINGLE,
+};
+#else
+static struct super_block *yaffs_ram_read_super(struct super_block * sb, void * data, int silent)
+{
+       return yaffs_internal_read_super(1,1,sb,data,silent);
+}
+
+static DECLARE_FSTYPE(yaffs_ram_fs_type, "yaffsram", yaffs_ram_read_super, FS_SINGLE);
+#endif
+
+#endif // CONFIG_YAFFS_RAM_ENABLED
+
+#ifdef CONFIG_YAFFS2_RAM_ENABLED
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
+static struct super_block *yaffs2_ram_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_ram);
+}
+
+
+static struct file_system_type yaffs2_ram_fs_type = {
+       .owner          = THIS_MODULE,
+       .name           = "yaffs2ram",
+       .get_sb         = yaffs2_ram_read_super,
+//     .kill_sb        = kill_block_super,
+       .kill_sb        = kill_litter_super,
+       .fs_flags       = FS_SINGLE,
+};
+#else
+static struct super_block *yaffs2_ram_read_super(struct super_block * sb, void * data, int silent)
+{
+       return yaffs_internal_read_super(2,1,sb,data,silent);
+}
+
+static DECLARE_FSTYPE(yaffs2_ram_fs_type, "yaffs2ram", yaffs2_ram_read_super, FS_SINGLE);
+#endif
+
+#endif // CONFIG_YAFFS2_RAM_ENABLED
+
+
+
+static struct proc_dir_entry *my_proc_entry;
+static struct proc_dir_entry *my_proc_ram_write_entry;
+
+static char * yaffs_dump_dev(char *buf,yaffs_Device *dev,char *name)
+{
+       buf +=sprintf(buf,"\nDevice %s\n",name);
+       buf +=sprintf(buf,"startBlock......... %d\n",dev->startBlock);
+       buf +=sprintf(buf,"endBlock........... %d\n",dev->endBlock);
+       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,"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,"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);
+
+       
+       return buf;     
+}
+
+static int  yaffs_proc_read(
+        char *page,
+       char **start,
+       off_t offset,
+       int count,
+       int *eof,
+       void *data
+       )
+{
+
+       char my_buffer[3000];
+       char *buf;
+       buf = my_buffer;
+
+       if (offset > 0) return 0;
+
+       /* Fill the buffer and get its length */
+       buf +=sprintf(buf,"YAFFS built:"__DATE__ " "__TIME__"\n%s\n%s\n", yaffs_fs_c_version,yaffs_guts_c_version);
+       
+       if(yaffs_dev) buf = yaffs_dump_dev(buf,yaffs_dev,"yaffs");
+       if(yaffsram_dev) buf = yaffs_dump_dev(buf,yaffsram_dev,"yaffsram");
+       
+
+       strcpy(page,my_buffer);
+       return strlen(my_buffer);
+}
+
+
+static int  yaffs_proc_ram_write(
+        char *page,
+       char **start,
+       off_t offset,
+       int count,
+       int *eof,
+       void *data
+       )
+{
+
+       printk(KERN_DEBUG "yaffs write size %d\n",count);
+       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[] =
+{
+#ifdef CONFIG_YAFFS_RAM_ENABLED
+     { &yaffs_ram_fs_type, 0},
+#endif
+#ifdef CONFIG_YAFFS2_RAM_ENABLED
+     { &yaffs2_ram_fs_type,0},
+#endif
+#ifdef CONFIG_YAFFS_MTD_ENABLED
+     { &yaffs_fs_type,0},
+#endif
+#ifdef CONFIG_YAFFS2_MTD_ENABLED
+     { &yaffs2_fs_type,0},
+#endif
+     { NULL,0}
+};
+
+static int __init init_yaffs_fs(void)
+{
+       int error = 0;
+       struct file_system_to_install *fsinst;  
+       
+       yaffs_dev = yaffsram_dev = NULL;
+       
+   T(YAFFS_TRACE_ALWAYS,("yaffs " __DATE__ " " __TIME__ " Installing. \n"));
+
+
+
+    /* Install the proc_fs entry */
+    my_proc_entry = create_proc_read_entry("yaffs",
+                                           S_IRUGO | S_IFREG,
+                                          &proc_root,
+                                          yaffs_proc_read,
+                                          NULL);
+    if(!my_proc_entry)
+    {
+       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",&proc_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., 2002,2003,2004");
+MODULE_LICENSE("GPL");
+
index 340c736..2f899f3 100644 (file)
@@ -1,19 +1,20 @@
+
 /*
- * YAFFS: Yet another FFS. A NAND-flash specific file system.
- * yaffs_guts.c  The main guts of YAFFS
+ * YAFFS: Yet another FFS. A NAND-flash specific file system. 
  *
  * Copyright (C) 2002 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
  *
+ * 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.
  *
  */
  //yaffs_guts.c
 
-const char *yaffs_guts_c_version="$Id: yaffs_guts.c,v 1.3 2004-11-22 03:22:25 charles Exp $";
+const char *yaffs_guts_c_version="$Id: yaffs_guts.c,v 1.4 2004-12-17 04:39:04 charles Exp $";
 
 #include "yportenv.h"
 
@@ -475,7 +476,8 @@ int yaffs_CheckFF(__u8 *buffer,int nBytes)
        //Horrible, slow implementation
        while(nBytes--)
        {
-               if(*buffer != 0xFF) return 0; 
+               if(*buffer != 0xFF) return 0;
+               buffer++;
        }
        return 1;
 }
@@ -4525,7 +4527,7 @@ static int yaffs_Scan(yaffs_Device *dev)
 
        yaffs_BlockIndex *blockIndex = NULL;
 
-       T(YAFFS_TRACE_SCAN,(TSTR("yaffs_Scan starts..." TENDSTR)));
+       T(YAFFS_TRACE_SCAN,(TSTR("yaffs_Scan starts  startblk %d endblk %d..." TENDSTR),dev->startBlock,dev->endBlock));
        
        chunkData = yaffs_GetTempBuffer(dev,__LINE__);
        
@@ -4550,6 +4552,8 @@ static int yaffs_Scan(yaffs_Device *dev)
                
                bi->blockState = state;
                bi->sequenceNumber = sequenceNumber;
+
+               T(YAFFS_TRACE_SCAN_DEBUG,(TSTR("Block scanning block %d state %d seq %d" TENDSTR),blk,state,sequenceNumber));
                
                if(state == YAFFS_BLOCK_STATE_DEAD)
                {
@@ -4557,6 +4561,7 @@ static int yaffs_Scan(yaffs_Device *dev)
                }
                else if(state == YAFFS_BLOCK_STATE_EMPTY)
                {
+                       T(YAFFS_TRACE_SCAN_DEBUG,(TSTR("Block empty " TENDSTR)));
                        dev->nErasedBlocks++;
                        dev->nFreeChunks += dev->nChunksPerBlock;
                }
@@ -4612,6 +4617,7 @@ static int yaffs_Scan(yaffs_Device *dev)
        {
                startIterator = 0;
                endIterator = nBlocksToScan-1;
+               T(YAFFS_TRACE_SCAN_DEBUG,(TSTR("%d blocks to be scanned" TENDSTR),nBlocksToScan));
        }
        else
        {
@@ -5697,4 +5703,3 @@ void yaffs_GutsTest(yaffs_Device *dev)
 #endif
 
 
-
index 506ecd6..cfcd16f 100644 (file)
@@ -14,7 +14,7 @@
  *
  * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
  *
- * $Id: yaffs_guts.h,v 1.2 2004-11-16 02:36:15 charles Exp $
+ * $Id: yaffs_guts.h,v 1.3 2004-12-17 04:39:04 charles Exp $
  */
 
 #ifndef __YAFFS_GUTS_H__
@@ -50,6 +50,9 @@
 #define YAFFS_BYTES_PER_BLOCK          (YAFFS_CHUNKS_PER_BLOCK*YAFFS_BYTES_PER_CHUNK)
 #endif
 
+#define YAFFS_MIN_YAFFS2_CHUNK_SIZE    1024
+#define YAFFS_MIN_YAFFS2_SPARE_SIZE    32
+
 #define YAFFS_MAX_CHUNK_ID                     0x000FFFFF
 
 #define YAFFS_UNUSED_OBJECT_ID         0x0003FFFF
@@ -532,9 +535,7 @@ struct yaffs_DeviceStruct
 
        struct semaphore sem;// Semaphore for waiting on erasure.
        struct semaphore grossLock; // Gross locking semaphore
-
-#endif 
-#ifdef __KERNEL__
+       __u8 * spareBuffer; // For mtdif2 use. Don't know the size of the buffer at compile time so we have to allocate it.
        void (*putSuperFunc)(struct super_block *sb);
 #endif
 
diff --git a/yaffs_mtdif.c b/yaffs_mtdif.c
new file mode 100644 (file)
index 0000000..2dfc705
--- /dev/null
@@ -0,0 +1,163 @@
+/*
+ * YAFFS: Yet another FFS. A NAND-flash specific file system. 
+ * yaffs_mtdif.c  NAND mtd wrapper functions.
+ *
+ * Copyright (C) 2002 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * 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.
+ *
+ */
+
+const char *yaffs_mtdif_c_version = "$Id: yaffs_mtdif.c,v 1.1 2004-12-17 04:39:04 charles Exp $";
+
+#ifdef CONFIG_YAFFS_MTD_ENABLED
+#include "yportenv.h"
+
+#include "yaffs_mtdif.h"
+
+#include "linux/mtd/mtd.h"
+#include "linux/types.h"
+#include "linux/time.h"
+
+#ifndef        CONFIG_YAFFS_USE_OLD_MTD
+#include "linux/mtd/nand.h"
+#endif
+
+struct nand_oobinfo yaffs_oobinfo = {
+       useecc: 1,
+       eccpos: {8, 9, 10, 13, 14, 15}
+};
+
+struct nand_oobinfo yaffs_noeccinfo = {
+       useecc: 0,
+};
+
+
+int nandmtd_WriteChunkToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, yaffs_Spare *spare)
+{
+       struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
+       size_t dummy;
+    int retval = 0;
+       
+       loff_t addr = ((loff_t)chunkInNAND) * dev->nBytesPerChunk;
+       
+       __u8 *spareAsBytes = (__u8 *)spare;
+
+#ifndef        CONFIG_YAFFS_USE_OLD_MTD
+       if(data && spare)
+       {
+               if(dev->useNANDECC)
+                       mtd->write_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,spareAsBytes,&yaffs_oobinfo);
+               else
+                       mtd->write_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,spareAsBytes,&yaffs_noeccinfo);
+       }
+       else
+       {
+#endif
+       if(data)
+               retval = mtd->write(mtd,addr,dev->nBytesPerChunk,&dummy,data);
+       if(spare)
+               retval = mtd->write_oob(mtd,addr,YAFFS_BYTES_PER_SPARE,&dummy,spareAsBytes);
+#ifndef        CONFIG_YAFFS_USE_OLD_MTD
+       }
+#endif
+
+    if (retval == 0)
+       return YAFFS_OK;
+    else
+        return YAFFS_FAIL;
+}
+
+int nandmtd_ReadChunkFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_Spare *spare)
+{
+       struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
+       size_t dummy;
+    int retval = 0;
+       
+       loff_t addr = ((loff_t)chunkInNAND) * dev->nBytesPerChunk;
+       
+       __u8 *spareAsBytes = (__u8 *)spare;
+       
+#ifndef        CONFIG_YAFFS_USE_OLD_MTD
+       if(data && spare)
+       {
+               if(dev->useNANDECC)
+               {   // Careful, this call adds 2 ints to the end of the spare data.  Calling function should
+            // allocate enough memory for spare, i.e. [YAFFS_BYTES_PER_SPARE+2*sizeof(int)].
+               retval = mtd->read_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,spareAsBytes,&yaffs_oobinfo);            
+               }
+               else
+               {
+                       retval = mtd->read_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,spareAsBytes,&yaffs_noeccinfo);
+               }
+       }
+       else
+       {
+#endif
+       if(data)
+               retval = mtd->read(mtd,addr,dev->nBytesPerChunk,&dummy,data);
+       if(spare)
+               retval = mtd->read_oob(mtd,addr,YAFFS_BYTES_PER_SPARE,&dummy,spareAsBytes);
+#ifndef        CONFIG_YAFFS_USE_OLD_MTD
+       }
+#endif
+
+    if (retval == 0)
+       return YAFFS_OK;
+    else
+        return YAFFS_FAIL;
+}
+
+// Callback not needed for NAND
+#if 0
+static void nandmtd_EraseCallback(struct erase_info *ei)
+{
+       yaffs_Device *dev = (yaffs_Device *)ei->priv;   
+       up(&dev->sem);
+}
+#endif
+
+
+int nandmtd_EraseBlockInNAND(yaffs_Device *dev, int blockNumber)
+{
+       struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
+       __u32 addr = ((loff_t) blockNumber) * dev->nBytesPerChunk * dev->nChunksPerBlock;
+       struct erase_info ei;
+    int retval = 0;
+       
+       ei.mtd = mtd;
+       ei.addr = addr;
+       ei.len = dev->nBytesPerChunk * dev->nChunksPerBlock;
+       ei.time = 1000;
+       ei.retries = 2;
+       ei.callback = NULL;
+       ei.priv = (u_long)dev;
+       
+       // Todo finish off the ei if required
+       
+       sema_init(&dev->sem,0);
+
+       retval = mtd->erase(mtd,&ei);   
+       
+       //No need for callback 
+       // down(&dev->sem); // Wait for the erasure to complete
+
+    if (retval == 0)   
+       return YAFFS_OK;
+    else
+        return YAFFS_FAIL;
+}
+
+int nandmtd_InitialiseNAND(yaffs_Device *dev)
+{
+       return YAFFS_OK;
+}
+
+#endif // CONFIG_YAFFS_MTD_ENABLED
+
diff --git a/yaffs_mtdif.h b/yaffs_mtdif.h
new file mode 100644 (file)
index 0000000..2e99813
--- /dev/null
@@ -0,0 +1,33 @@
+/*
+ * YAFFS: Yet another FFS. A NAND-flash specific file system. 
+ * yaffs_mtdif.h  NAND mtd interface wrappers
+ *
+ * Copyright (C) 2002 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ *
+ * $Id: yaffs_mtdif.h,v 1.1 2004-12-17 04:39:04 charles Exp $
+ */
+
+#ifndef __YAFFS_MTDIF_H__
+#define __YAFFS_MTDIF_H__
+
+#include "yaffs_guts.h"
+
+int nandmtd_WriteChunkToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, yaffs_Spare *spare);
+int nandmtd_ReadChunkFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_Spare *spare);
+int nandmtd_EraseBlockInNAND(yaffs_Device *dev, int blockNumber);
+int nandmtd_InitialiseNAND(yaffs_Device *dev);
+#endif
+
+
+
+
diff --git a/yaffs_mtdif2.c b/yaffs_mtdif2.c
new file mode 100644 (file)
index 0000000..9ddf799
--- /dev/null
@@ -0,0 +1,184 @@
+/*
+ * YAFFS: Yet another FFS. A NAND-flash specific file system. 
+ * yaffs_mtdif.c  NAND mtd wrapper functions.
+ *
+ * Copyright (C) 2002 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * 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.
+ *
+ */
+
+// mtd interface for YAFFS2
+
+const char *yaffs_mtdif2_c_version = "$Id: yaffs_mtdif2.c,v 1.1 2004-12-17 04:39:04 charles Exp $";
+
+#ifdef CONFIG_YAFFS_MTD_ENABLED
+#include "yportenv.h"
+
+#include "yaffs_mtdif2.h"
+
+#include "linux/mtd/mtd.h"
+#include "linux/types.h"
+#include "linux/time.h"
+
+#include "yaffs_packedtags2.h"
+
+
+
+
+int nandmtd2_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_ExtendedTags *tags)
+{
+       struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
+       size_t dummy;
+       int retval = 0;
+
+
+       loff_t addr = ((loff_t)chunkInNAND) * dev->nBytesPerChunk;
+
+       yaffs_PackedTags2 pt;
+       
+       T(YAFFS_TRACE_MTD,(TSTR("nandmtd2_WriteChunkWithTagsToNAND chunk %d data %08x tags %08x" TENDSTR),chunkInNAND,data,tags));      
+
+       if(tags)
+       {
+               yaffs_PackTags2(&pt,tags);
+       }
+
+#ifndef        CONFIG_YAFFS_USE_OLD_MTD
+       if(data && tags)
+       {
+               if(dev->useNANDECC)
+                 retval = mtd->write_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,(__u8 *)&pt,NULL);
+               else
+                 retval = mtd->write_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,(__u8 *)&pt,NULL);
+       }
+       else
+       {
+#endif
+       if(data)
+               retval = mtd->write(mtd,addr,dev->nBytesPerChunk,&dummy,data);
+       if(tags)
+               retval = mtd->write_oob(mtd,addr,mtd->oobsize,&dummy,(__u8 *)&pt);
+               
+#ifndef        CONFIG_YAFFS_USE_OLD_MTD
+       }
+#endif
+
+    if (retval == 0)
+       return YAFFS_OK;
+    else
+        return YAFFS_FAIL;
+}
+
+int nandmtd2_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_ExtendedTags *tags)
+{
+       struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
+       size_t dummy;
+        int retval = 0;
+       
+
+       loff_t addr = ((loff_t)chunkInNAND) * dev->nBytesPerChunk;
+       
+       yaffs_PackedTags2 pt;
+
+       T(YAFFS_TRACE_MTD,(TSTR("nandmtd2_ReadChunkWithTagsToNAND chunk %d data %08x tags %08x" TENDSTR),chunkInNAND,data,tags));       
+
+#ifndef        CONFIG_YAFFS_USE_OLD_MTD
+       if(data && tags)
+       {
+               if(dev->useNANDECC)
+               {
+                       retval = mtd->read_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,dev->spareBuffer,NULL);            
+               }
+               else
+               {
+                       retval = mtd->read_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,dev->spareBuffer,NULL);
+               }
+       }
+       else
+       {
+#endif
+       if(data)
+               retval = mtd->read(mtd,addr,dev->nBytesPerChunk,&dummy,data);
+       if(tags)
+               retval = mtd->read_oob(mtd,addr,mtd->oobsize,&dummy,dev->spareBuffer);
+#ifndef        CONFIG_YAFFS_USE_OLD_MTD
+       }
+#endif
+
+    memcpy(&pt,dev->spareBuffer,sizeof(pt));
+    
+    if(tags)
+       yaffs_UnpackTags2(tags,&pt);
+    
+    if (retval == 0)
+       return YAFFS_OK;
+    else
+        return YAFFS_FAIL;
+}
+
+int nandmtd2_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
+{
+       struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
+       int retval;
+       T(YAFFS_TRACE_MTD,(TSTR("nandmtd2_MarkNANDBlockBad %d" TENDSTR),blockNo));      
+       
+       
+       retval = mtd->block_markbad(mtd,blockNo);
+
+    if (retval == 0)
+       return YAFFS_OK;
+    else
+        return YAFFS_FAIL;
+
+}
+
+int nandmtd2_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo, yaffs_BlockState *state, int *sequenceNumber)
+{
+       struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
+       int retval;
+       
+       T(YAFFS_TRACE_MTD,(TSTR("nandmtd2_QueryNANDBlock %d" TENDSTR),blockNo));        
+       retval = mtd->block_isbad(mtd,blockNo);
+       
+       if(retval)
+       {
+               T(YAFFS_TRACE_MTD,(TSTR("block is bad" TENDSTR)));
+       
+               *state = YAFFS_BLOCK_STATE_DEAD;
+               *sequenceNumber = 0;
+       }
+       else
+       {
+               yaffs_ExtendedTags t;
+               nandmtd2_ReadChunkWithTagsFromNAND(dev,blockNo * dev->nChunksPerBlock,NULL, &t);
+               
+               if(t.chunkUsed)
+               {
+                 *sequenceNumber = t.sequenceNumber;
+                 *state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
+               }
+               else
+               {
+                 *sequenceNumber = 0;
+                 *state = YAFFS_BLOCK_STATE_EMPTY;
+               }
+       }
+               T(YAFFS_TRACE_MTD,(TSTR("block is bad seq %d state %d" TENDSTR), *sequenceNumber,*state));
+
+    if (retval == 0)
+       return YAFFS_OK;
+    else
+        return YAFFS_FAIL;
+}
+
+#endif
+
+
+
diff --git a/yaffs_mtdif2.h b/yaffs_mtdif2.h
new file mode 100644 (file)
index 0000000..5b308ee
--- /dev/null
@@ -0,0 +1,27 @@
+/*
+ * YAFFS: Yet another FFS. A NAND-flash specific file system. 
+ * yaffs_mtdif.c  NAND mtd wrapper functions.
+ *
+ * Copyright (C) 2002 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * 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.
+ *
+ */
+
+
+#ifndef __YAFFS_MTDIF2_H__
+#define __YAFFS_MTDIF2_H__
+
+
+#include "yaffs_guts.h"
+int nandmtd2_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_ExtendedTags *tags);
+int nandmtd2_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_ExtendedTags *tags);
+int nandmtd2_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo);
+int nandmtd2_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo, yaffs_BlockState *state, int *sequenceNumber);
+
+#endif 
diff --git a/yaffs_nandemul.h b/yaffs_nandemul.h
new file mode 100644 (file)
index 0000000..8503331
--- /dev/null
@@ -0,0 +1,38 @@
+/*
+ * YAFFS: Yet another FFS. A NAND-flash specific file system. 
+ *
+ * Copyright (C) 2002 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ *
+ * yaffs_nandemul.h: Interface to emulated NAND functions
+ *
+ * $Id: yaffs_nandemul.h,v 1.1 2004-12-17 04:39:04 charles Exp $
+ */
+#ifndef __YAFFS_NANDEMUL_H__
+#define __YAFFS_NANDEMUL_H__
+
+#include "yaffs_guts.h" 
+/* WriteChunkToNAND and ReadChunkFromNAND are used with two pointers. 
+ * If either of these pointers are null, then that field will not be 
+ * transferred.
+ */
+int nandemul_WriteChunkToNAND(struct yaffs_DeviceStruct *dev,int chunkInNAND, const __u8 *data, yaffs_Spare *spare);
+int nandemul_ReadChunkFromNAND(struct yaffs_DeviceStruct *dev,int chunkInNAND, __u8 *data, yaffs_Spare *spare);
+int nandemul_EraseBlockInNAND(struct yaffs_DeviceStruct *dev,int blockInNAND);
+int nandemul_InitialiseNAND(struct yaffs_DeviceStruct *dev);
+
+#endif
+
diff --git a/yaffs_nandemul2k.h b/yaffs_nandemul2k.h
new file mode 100644 (file)
index 0000000..9778b86
--- /dev/null
@@ -0,0 +1,38 @@
+/*
+ * YAFFS: Yet another FFS. A NAND-flash specific file system. 
+ *
+ * Copyright (C) 2002 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ *
+ * yaffs_nandemul2k.h: Interface to emulated NAND functions (2k page size)
+ *
+ * $Id: yaffs_nandemul2k.h,v 1.1 2004-12-17 04:39:04 charles Exp $
+ */
+#ifndef __YAFFS_NANDEMUL2K_H__
+#define __YAFFS_NANDEMUL2K_H__
+
+#include "yaffs_guts.h" 
+int nandemul2k_WriteChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,int chunkInNAND, const __u8 *data, yaffs_ExtendedTags *tags);
+int nandemul2k_ReadChunkWithTagsFromNAND(struct yaffs_DeviceStruct *dev,int chunkInNAND, __u8 *data, yaffs_ExtendedTags *tags);
+int nandemul2k_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo);
+int nandemul2k_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo, yaffs_BlockState *state, int *sequenceNumber);
+int nandemul2k_EraseBlockInNAND(struct yaffs_DeviceStruct *dev,int blockInNAND);
+int nandemul2k_InitialiseNAND(struct yaffs_DeviceStruct *dev);
+int nandemul2k_GetBytesPerChunk(void);
+int nandemul2k_GetChunksPerBlock(void);
+int nandemul2k_GetNumberOfBlocks(void);
+
+#endif
+
index 018eacf..bab338f 100644 (file)
@@ -1,7 +1,7 @@
 #include "yaffs_packedtags1.h"
 #include "yportenv.h"
 
-void yaffs_PackTags1(yaffs_PackedTags1 *pt, yaffs_ExtendedTags *t)
+void yaffs_PackTags1(yaffs_PackedTags1 *pt, const yaffs_ExtendedTags *t)
 {
        pt->chunkId = t->chunkId;
        pt->serialNumber = t->serialNumber;
@@ -14,7 +14,7 @@ void yaffs_PackTags1(yaffs_PackedTags1 *pt, yaffs_ExtendedTags *t)
        
 }
 
-void yaffs_UnpackTags1(yaffs_ExtendedTags *t, yaffs_PackedTags1 *pt)
+void yaffs_UnpackTags1(yaffs_ExtendedTags *t, const yaffs_PackedTags1 *pt)
 {
        static const __u8 allFF[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,0xff, 0xff, 0xff, 0xff};
        
index 5f67668..0f76615 100644 (file)
@@ -21,8 +21,8 @@ typedef struct
 
 
 
-void yaffs_PackTags1(yaffs_PackedTags1 *pt, yaffs_ExtendedTags *t);
-void yaffs_UnpackTags1(yaffs_ExtendedTags *t, yaffs_PackedTags1 *pt);
+void yaffs_PackTags1(yaffs_PackedTags1 *pt, const yaffs_ExtendedTags *t);
+void yaffs_UnpackTags1(yaffs_ExtendedTags *t, const yaffs_PackedTags1 *pt);
 #endif
 
 
index f734882..97668dc 100644 (file)
@@ -2,19 +2,33 @@
 #include "yportenv.h"
 
 
+static void yaffs_DumpPackedTags2(const yaffs_PackedTags2 *pt)
+{
+       T(YAFFS_TRACE_MTD,(TSTR("packed tags obj %d chunk %d byte %d seq %d"TENDSTR),pt->t.objectId,pt->t.chunkId,pt->t.byteCount,pt->t.sequenceNumber));
+}
+
+static void yaffs_DumpTags2(const yaffs_ExtendedTags *t)
+{
+       T(YAFFS_TRACE_MTD,(TSTR("ext.tags eccres %d blkbad %d chused %d obj %d chunk%d byte %d del %d ser %d seq %d"TENDSTR),
+            t->eccResult, t->blockBad, t->chunkUsed, t->objectId, t->chunkId, t->byteCount, t->chunkDeleted, t->serialNumber, t->sequenceNumber));
+         
+}
 
-void yaffs_PackTags2(yaffs_PackedTags2 *pt, yaffs_ExtendedTags *t)
+void yaffs_PackTags2(yaffs_PackedTags2 *pt, const yaffs_ExtendedTags *t)
 {
        pt->t.chunkId = t->chunkId;
        pt->t.sequenceNumber = t->sequenceNumber;
        pt->t.byteCount = t->byteCount;
        pt->t.objectId = t->objectId;
        
+       yaffs_DumpPackedTags2(pt);
+       yaffs_DumpTags2(t);
+       
        yaffs_ECCCalculateOther((unsigned char *)&pt->t,sizeof(yaffs_PackedTags2TagsPart),&pt->ecc);
        
 }
 
-void yaffs_UnpackTags2(yaffs_ExtendedTags *t, yaffs_PackedTags2 *pt)
+void yaffs_UnpackTags2(yaffs_ExtendedTags *t, const yaffs_PackedTags2 *pt)
 {
 
        
@@ -38,5 +52,9 @@ void yaffs_UnpackTags2(yaffs_ExtendedTags *t, yaffs_PackedTags2 *pt)
                t->serialNumber = 0;
                t->sequenceNumber = pt->t.sequenceNumber;
        }
+
+       yaffs_DumpPackedTags2(pt);
+       yaffs_DumpTags2(t);
+
 }
 
index 659e2f6..7eb89d4 100644 (file)
@@ -24,8 +24,8 @@ typedef struct
 } yaffs_PackedTags2;
 
 
-void yaffs_PackTags2(yaffs_PackedTags2 *pt, yaffs_ExtendedTags *t);
-void yaffs_UnpackTags2(yaffs_ExtendedTags *t, yaffs_PackedTags2 *pt);
+void yaffs_PackTags2(yaffs_PackedTags2 *pt, const  yaffs_ExtendedTags *t);
+void yaffs_UnpackTags2(yaffs_ExtendedTags *t, const yaffs_PackedTags2 *pt);
 #endif
 
 
diff --git a/yaffs_ramem.c b/yaffs_ramem.c
new file mode 100644 (file)
index 0000000..15dbabf
--- /dev/null
@@ -0,0 +1,312 @@
+/*
+ * YAFFS: Yet another FFS. A NAND-flash specific file system. 
+ * yaffs_ramem.c  NAND emulation on top of a chunk of RAM
+ *
+ * Copyright (C) 2002 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * 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.
+ *
+ */
+ //yaffs_ramem.c
+ // Since this creates the RAM block at start up it is pretty useless for testing the scanner.
+
+const char *yaffs_ramem_c_version = "$Id: yaffs_ramem.c,v 1.1 2004-12-17 04:39:04 charles Exp $";
+
+#ifndef __KERNEL__
+#define CONFIG_YAFFS_RAM_ENABLED
+#endif
+
+#ifdef CONFIG_YAFFS_RAM_ENABLED
+
+#include "yportenv.h"
+
+#include "yaffs_nandemul.h"
+#include "yaffs_guts.h"
+#include "yaffsinterface.h"
+#include "devextras.h"
+
+
+#define EM_SIZE_IN_MEG 2
+
+#define BLOCK_SIZE (32 * 528)
+#define BLOCKS_PER_MEG ((1024*1024)/(32 * 512))
+#define FILE_SIZE_IN_BLOCKS (FILE_SIZE_IN_MEG * BLOCKS_PER_MEG)
+#define FILE_SIZE_IN_BYTES (FILE_SIZE_IN_BLOCKS * BLOCK_SIZE)
+
+
+
+#define DEFAULT_SIZE_IN_MB 2
+
+typedef struct 
+{
+       __u8 data[528]; // Data + spare
+       int count[3];   // The programming count for each area of
+                       // the page (0..255,256..511,512..527
+       int empty;      // is this empty?
+} nandemul_Page;
+
+typedef struct
+{
+       nandemul_Page page[32]; // The pages in the block
+       __u8 damaged;           // Is the block damaged?
+       
+} nandemul_Block;
+
+
+
+typedef struct
+{
+       nandemul_Block **block;
+       int nBlocks;
+} nandemul_Device;
+
+static nandemul_Device ned;
+
+static int sizeInMB = DEFAULT_SIZE_IN_MB;
+
+
+static void nandemul_yield(int n)
+{
+#ifdef __KERNEL__
+       if(n > 0) schedule_timeout(n);
+#endif
+
+}
+
+
+static void nandemul_ReallyEraseBlock(int blockNumber)
+{
+       int i;
+       
+       nandemul_Block *theBlock = ned.block[blockNumber];
+       
+       for(i = 0; i < 32; i++)
+       {
+               memset(theBlock->page[i].data,0xff,528);
+               theBlock->page[i].count[0] = 0;
+               theBlock->page[i].count[1] = 0;
+               theBlock->page[i].count[2] = 0;
+               theBlock->page[i].empty = 1;
+               nandemul_yield(2);
+       }
+
+}
+
+
+int nandemul_CalcNBlocks(void)
+{
+        switch(sizeInMB)
+        {
+               case 8:
+               case 16:
+               case 32:
+               case 64:
+               case 128:
+               case 256:
+               case 512:
+                       break;
+               default:
+                       sizeInMB = DEFAULT_SIZE_IN_MB;
+        }
+       return sizeInMB * 64;
+}
+
+
+
+static int  CheckInit(void)
+{
+       static int initialised = 0;
+       
+       int i;
+       int fail = 0;
+       int nBlocks; 
+       int nAllocated = 0;
+       
+       if(initialised) 
+       {
+               return YAFFS_OK;
+       }
+       
+       
+       nBlocks = nandemul_CalcNBlocks();
+       
+       ned.block = YMALLOC(sizeof(nandemul_Block *) * nBlocks);
+       
+       if(!ned.block) return 0;
+       
+       for(i=0; i <nBlocks; i++)
+       {
+               ned.block[i] = NULL;
+       }
+       
+       for(i=0; i <nBlocks && !fail; i++)
+       {
+               if((ned.block[i] = YMALLOC(sizeof(nandemul_Block))) == 0)
+               {
+                       fail = 1;
+               }
+               else
+               {
+                       nandemul_ReallyEraseBlock(i);
+                       ned.block[i]->damaged = 0;
+                       nAllocated++;
+               }
+       }
+       
+       if(fail)
+       {
+               for(i = 0; i < nAllocated; i++)
+               {
+                       YFREE(ned.block[i]);
+               }
+               YFREE(ned.block);
+               
+               T(YAFFS_TRACE_ALWAYS,("Allocation failed, could only allocate %dMB of %dMB requested.\n",
+                  nAllocated/64,sizeInMB));
+               return 0;
+       }
+       
+       ned.nBlocks = nBlocks;
+       
+       initialised = 1;
+       
+       return 1;
+}
+
+int nandemul_WriteChunkToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, yaffs_Spare *spare)
+{
+       int blk;
+       int pg;
+       int i;
+       
+       __u8 *x;
+       
+       __u8 *spareAsBytes = (__u8 *)spare;
+
+       
+       CheckInit();
+       
+       blk = chunkInNAND/32;
+       pg = chunkInNAND%32;
+       
+       
+       if(data)
+       {
+               x = ned.block[blk]->page[pg].data;
+               
+               for(i = 0; i < 512; i++)
+               {
+                       x[i] &=data[i];
+               }
+               
+               ned.block[blk]->page[pg].count[0]++;
+               ned.block[blk]->page[pg].count[1]++;
+               ned.block[blk]->page[pg].empty = 0;
+       }
+       
+       
+       if(spare)
+       {
+               x = &ned.block[blk]->page[pg].data[512];
+                       
+               for(i = 0; i < 16; i++)
+               {
+                       x[i] &=spareAsBytes[i];
+               }
+               ned.block[blk]->page[pg].count[2]++;
+       }
+       
+       if(spare || data)
+       {
+               nandemul_yield(1);
+       }
+
+       return YAFFS_OK;
+}
+
+
+int nandemul_ReadChunkFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_Spare *spare)
+{
+       int blk;
+       int pg;
+
+       
+       CheckInit();
+       
+       blk = chunkInNAND/32;
+       pg = chunkInNAND%32;
+       
+       
+       if(data)
+       {
+               memcpy(data,ned.block[blk]->page[pg].data,512);
+       }
+       
+       
+       if(spare)
+       {
+               memcpy(spare,&ned.block[blk]->page[pg].data[512],16);
+       }
+
+       return YAFFS_OK;
+}
+
+
+int nandemul_CheckChunkErased(yaffs_Device *dev,int chunkInNAND)
+{
+       int blk;
+       int pg;
+       int i;
+
+       
+       CheckInit();
+       
+       blk = chunkInNAND/32;
+       pg = chunkInNAND%32;
+       
+       
+       for(i = 0; i < 528; i++)
+       {
+               if(ned.block[blk]->page[pg].data[i] != 0xFF)
+               {
+                       return YAFFS_FAIL;
+               }
+       }
+
+       return YAFFS_OK;
+
+}
+
+int nandemul_EraseBlockInNAND(yaffs_Device *dev, int blockNumber)
+{
+       
+       CheckInit();
+       
+       if(blockNumber < 0 || blockNumber >= ned.nBlocks)
+       {
+               T(YAFFS_TRACE_ALWAYS,("Attempt to erase non-existant block %d\n",blockNumber));
+       }
+       else if(ned.block[blockNumber]->damaged)
+       {
+               T(YAFFS_TRACE_ALWAYS,("Attempt to erase damaged block %d\n",blockNumber));
+       }
+       else
+       {
+               nandemul_ReallyEraseBlock(blockNumber);
+       }
+       
+       return YAFFS_OK;
+}
+
+int nandemul_InitialiseNAND(yaffs_Device *dev)
+{
+       return YAFFS_OK;
+}
+
+#endif //YAFFS_RAM_ENABLED
+
diff --git a/yaffs_ramem2k.c b/yaffs_ramem2k.c
new file mode 100644 (file)
index 0000000..2c113db
--- /dev/null
@@ -0,0 +1,360 @@
+/*
+ * YAFFS: Yet another FFS. A NAND-flash specific file system. 
+ * yaffs_ramem.c  NAND emulation on top of a chunk of RAM
+ *
+ * Copyright (C) 2002 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * 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.
+ *
+ */
+ //yaffs_ramem2k.c: RAM emulation in-kernel for 2K pages (YAFFS2)
+
+
+const char *yaffs_ramem2k_c_version = "$Id: yaffs_ramem2k.c,v 1.1 2004-12-17 04:39:04 charles Exp $";
+
+#ifndef __KERNEL__
+#define CONFIG_YAFFS_RAM_ENABLED
+#endif
+
+#ifdef CONFIG_YAFFS_RAM_ENABLED
+
+#include "yportenv.h"
+
+#include "yaffs_nandemul2k.h"
+#include "yaffs_guts.h"
+#include "yaffsinterface.h"
+#include "devextras.h"
+#include "yaffs_packedtags2.h"
+
+
+
+#define EM_SIZE_IN_MEG 2
+#define PAGE_DATA_SIZE  (2048)
+#define PAGE_SPARE_SIZE (64)
+#define PAGES_PER_BLOCK (64)
+
+
+
+#define EM_SIZE_IN_BYTES (EM_SIZE_IN_MEG * (1<<20))
+
+#define PAGE_TOTAL_SIZE (PAGE_DATA_SIZE+PAGE_SPARE_SIZE)
+
+#define BLOCK_TOTAL_SIZE (PAGES_PER_BLOCK * PAGE_TOTAL_SIZE)
+
+#define BLOCKS_PER_MEG ((1<<20)/(PAGES_PER_BLOCK * PAGE_DATA_SIZE))
+
+
+typedef struct 
+{
+       __u8 data[PAGE_TOTAL_SIZE]; // Data + spare
+       int empty;      // is this empty?
+} nandemul_Page;
+
+
+typedef struct
+{
+       nandemul_Page *page[PAGES_PER_BLOCK];
+       int damaged;    
+} nandemul_Block;
+
+
+
+typedef struct
+{
+       nandemul_Block**block;
+       int nBlocks;
+} nandemul_Device;
+
+static nandemul_Device ned;
+
+static int sizeInMB = EM_SIZE_IN_MEG;
+
+
+static void nandemul_yield(int n)
+{
+#ifdef __KERNEL__
+       if(n > 0) schedule_timeout(n);
+#endif
+
+}
+
+
+static void nandemul_ReallyEraseBlock(int blockNumber)
+{
+       int i;
+       
+       nandemul_Block *blk;
+       
+       if(blockNumber < 0 || blockNumber >= ned.nBlocks)
+       {
+               return;
+       }
+       
+       blk = ned.block[blockNumber];
+       
+       for(i = 0; i < PAGES_PER_BLOCK; i++)
+       {
+               memset(blk->page[i],0xff,sizeof(nandemul_Page));
+               blk->page[i]->empty = 1;
+       }
+       nandemul_yield(2);
+}
+
+
+static int nandemul2k_CalcNBlocks(void)
+{
+       return EM_SIZE_IN_MEG * BLOCKS_PER_MEG;
+}
+
+
+
+static int  CheckInit(void)
+{
+       static int initialised = 0;
+       
+       int i,j;
+       
+       int fail = 0;
+       int nBlocks; 
+
+       int nAllocated = 0;
+       
+       if(initialised) 
+       {
+               return YAFFS_OK;
+       }
+       
+       
+       ned.nBlocks = nBlocks = nandemul2k_CalcNBlocks();
+
+       
+       ned.block = YMALLOC(sizeof(nandemul_Block*) * nBlocks );
+       
+       if(!ned.block) return YAFFS_FAIL;
+       
+       
+       
+
+               
+       for(i=fail=0; i <nBlocks; i++)
+       {
+               
+               nandemul_Block *blk;
+               
+               if(!(blk = ned.block[i] = YMALLOC(sizeof(nandemul_Block))))
+               {
+                fail = 1;
+               }  
+               else
+               {
+                       for(j = 0; j < PAGES_PER_BLOCK; j++)
+                       {
+                               if((blk->page[j] = YMALLOC(sizeof(nandemul_Page))) == 0)
+                               {
+                                       fail = 1;
+                               }
+                       }
+                       nandemul_ReallyEraseBlock(i);
+                       ned.block[i]->damaged = 0;
+                       nAllocated++;
+               }
+       }
+       
+       if(fail)
+       {
+               //Todo thump pages
+               
+               for(i = 0; i < nAllocated; i++)
+               {
+                       YFREE(ned.block[i]);
+               }
+               YFREE(ned.block);
+               
+               T(YAFFS_TRACE_ALWAYS,("Allocation failed, could only allocate %dMB of %dMB requested.\n",
+                  nAllocated/64,sizeInMB));
+               return 0;
+       }
+       
+       ned.nBlocks = nBlocks;
+       
+       initialised = 1;
+       
+       return 1;
+}
+
+int nandemul2k_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, yaffs_ExtendedTags *tags)
+{
+       int blk;
+       int pg;
+       int i;
+       
+       __u8 *x;
+
+       
+       blk = chunkInNAND/PAGES_PER_BLOCK;
+       pg = chunkInNAND%PAGES_PER_BLOCK;
+       
+       
+       if(data)
+       {
+               x = ned.block[blk]->page[pg]->data;
+               
+               for(i = 0; i < PAGE_DATA_SIZE; i++)
+               {
+                       x[i] &=data[i];
+               }
+
+               ned.block[blk]->page[pg]->empty = 0;
+       }
+       
+       
+       if(tags)
+       {
+               x = &ned.block[blk]->page[pg]->data[PAGE_DATA_SIZE];
+               
+               yaffs_PackTags2((yaffs_PackedTags2 *)x,tags);
+                       
+       }
+       
+       if(tags || data)
+       {
+               nandemul_yield(1);
+       }
+
+       return YAFFS_OK;
+}
+
+
+int nandemul2k_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_ExtendedTags *tags)
+{
+       int blk;
+       int pg;
+       
+       __u8 *x;
+
+       
+       
+       blk = chunkInNAND/PAGES_PER_BLOCK;
+       pg = chunkInNAND%PAGES_PER_BLOCK;
+       
+       
+       if(data)
+       {
+               memcpy(data,ned.block[blk]->page[pg]->data,PAGE_DATA_SIZE);
+       }
+       
+       
+       if(tags)
+       {
+               x = &ned.block[blk]->page[pg]->data[PAGE_DATA_SIZE];
+               
+               yaffs_UnpackTags2(tags,(yaffs_PackedTags2 *)x);
+       }
+
+       return YAFFS_OK;
+}
+
+
+int nandemul2k_CheckChunkErased(yaffs_Device *dev,int chunkInNAND)
+{
+       int blk;
+       int pg;
+       int i;
+
+       
+       
+       blk = chunkInNAND/PAGES_PER_BLOCK;
+       pg = chunkInNAND%PAGES_PER_BLOCK;
+       
+       
+       for(i = 0; i < PAGE_TOTAL_SIZE; i++)
+       {
+               if(ned.block[blk]->page[pg]->data[i] != 0xFF)
+               {
+                       return YAFFS_FAIL;
+               }
+       }
+
+       return YAFFS_OK;
+
+}
+
+int nandemul2k_EraseBlockInNAND(yaffs_Device *dev, int blockNumber)
+{
+       
+       
+       if(blockNumber < 0 || blockNumber >= ned.nBlocks)
+       {
+               T(YAFFS_TRACE_ALWAYS,("Attempt to erase non-existant block %d\n",blockNumber));
+       }
+       else if(ned.block[blockNumber]->damaged)
+       {
+               T(YAFFS_TRACE_ALWAYS,("Attempt to erase damaged block %d\n",blockNumber));
+       }
+       else
+       {
+               nandemul_ReallyEraseBlock(blockNumber);
+       }
+       
+       return YAFFS_OK;
+}
+
+int nandemul2k_InitialiseNAND(yaffs_Device *dev)
+{
+       CheckInit();
+       return YAFFS_OK;
+}
+int nandemul2k_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
+{
+       
+       __u8 *x;
+       
+       x = &ned.block[blockNo]->page[0]->data[PAGE_DATA_SIZE];
+       
+       memset(x,0,sizeof(yaffs_PackedTags2));
+       
+       
+       return YAFFS_OK;
+       
+}
+
+int nandemul2k_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo, yaffs_BlockState *state, int *sequenceNumber)
+{
+       yaffs_ExtendedTags tags;
+       int chunkNo;
+
+       *sequenceNumber = 0;
+       
+       chunkNo = blockNo * dev->nChunksPerBlock;
+       
+       nandemul2k_ReadChunkWithTagsFromNAND(dev,chunkNo,NULL,&tags);
+       if(tags.blockBad)
+       {
+               *state = YAFFS_BLOCK_STATE_DEAD;
+       }
+       else if(!tags.chunkUsed)
+       {
+               *state = YAFFS_BLOCK_STATE_EMPTY;
+       }
+       else if(tags.chunkUsed)
+       {
+               *state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
+               *sequenceNumber = tags.sequenceNumber;
+       }
+       return YAFFS_OK;
+}
+
+int nandemul2k_GetBytesPerChunk(void) { return PAGE_DATA_SIZE;}
+
+int nandemul2k_GetChunksPerBlock(void) { return PAGES_PER_BLOCK; }
+int nandemul2k_GetNumberOfBlocks(void) {return nandemul2k_CalcNBlocks();}
+
+
+#endif //YAFFS_RAM_ENABLED
+
index a1a2074..aa211e7 100644 (file)
@@ -15,7 +15,7 @@
  *
  * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
  *
- * $Id: yportenv.h,v 1.4 2004-11-22 03:22:25 charles Exp $
+ * $Id: yportenv.h,v 1.5 2004-12-17 04:39:04 charles Exp $
  *
  */
  
@@ -147,6 +147,8 @@ extern unsigned yaffs_traceMask;
 #define YAFFS_TRACE_BUFFERS            0x00000400
 #define YAFFS_TRACE_NANDACCESS         0x00000800
 #define YAFFS_TRACE_GC_DETAIL          0x00001000
+#define YAFFS_TRACE_SCAN_DEBUG         0x00002000
+#define YAFFS_TRACE_MTD                        0x00004000
 #define YAFFS_TRACE_ALWAYS             0x40000000
 #define YAFFS_TRACE_BUG                        0x80000000