linux-vax-kern-commit

[Andy P. <at...@us...>]

Update of /cvsroot/linux-vax/kernel-2.4/fs/jffs2
In directory usw-pr-cvs1:/tmp/cvs-serv29245/jffs2

Added Files:
	Makefile TODO background.c build.c compr.c compr_rtime.c 
	compr_rubin.c compr_rubin.h compr_zlib.c comprtest.c crc32.c 
	crc32.h dir.c erase.c file.c gc.c histo.h histo_mips.h ioctl.c 
	malloc.c nodelist.c nodelist.h nodemgmt.c pushpull.c 
	pushpull.h read.c readinode.c scan.c super.c symlink.c write.c 
	zlib.c zlib.h 
Log Message:
synch 2.4.15 commit 13


--- NEW FILE ---
#
# Makefile for the linux Journalling Flash FileSystem (JFFS) routines.
#
# $Id: Makefile,v 1.1 2002/04/09 13:19:33 atp Exp $
#
# Note! Dependencies are done automagically by 'make dep', which also
# removes any old dependencies. DON'T put your own dependencies here
# unless it's something special (ie not a .c file).
#
# Note 2! The CFLAGS definitions are now in the main makefile...


COMPR_OBJS	:= compr.o compr_rubin.o compr_rtime.o pushpull.o \
			compr_zlib.o zlib.o
JFFS2_OBJS	:= crc32.o dir.o file.o ioctl.o nodelist.o malloc.o \
	read.o nodemgmt.o readinode.o super.o write.o scan.o gc.o \
	symlink.o build.o erase.o background.o

O_TARGET := jffs2.o

obj-y := $(COMPR_OBJS) $(JFFS2_OBJS)
obj-m := $(O_TARGET)

include $(TOPDIR)/Rules.make


--- NEW FILE ---
$Id: TODO,v 1.1 2002/04/09 13:19:33 atp Exp $

 - disable compression in commit_write()? Or at least optimise the 'always write
	whole page' bit.
 - fix zlib. It's ugly as hell and there are at least three copies in the kernel tree
 - fine-tune the allocation / GC thresholds
 - chattr support - turning on/off and tuning compression per-inode
 - checkpointing (do we need this? scan is quite fast)
 - make the scan code populate real inodes so read_inode just after 
	mount doesn't have to read the flash twice for large files.
	Make this a per-inode option, changable with chattr, so you can
	decide which inodes should be in-core immediately after mount.
 - stop it depending on a block device. mount(8) needs a change for this.
 - make it work on NAND flash. We need to know when we can GC
	deletion dirents, etc. And think about holes/truncation. It can
	all be done reasonably simply, but it need implementing.
 - NAND flash will require new dirent/dnode structures on the medium with
	ECC data in rather than just the CRC we're using ATM.
 - test, test, test


--- NEW FILE ---
/*
 * JFFS2 -- Journalling Flash File System, Version 2.
 *
 * Copyright (C) 2001 Red Hat, Inc.
 *
 * Created by David Woodhouse <dw...@ca...>
 *
 * The original JFFS, from which the design for JFFS2 was derived,
 * was designed and implemented by Axis Communications AB.
 *
 * The contents of this file are subject to the Red Hat eCos Public
 * License Version 1.1 (the "Licence"); you may not use this file
 * except in compliance with the Licence.  You may obtain a copy of
 * the Licence at http://www.redhat.com/
 *
 * Software distributed under the Licence is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing rights and
 * limitations under the Licence.
 *
 * The Original Code is JFFS2 - Journalling Flash File System, version 2
 *
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License version 2 (the "GPL"), in
 * which case the provisions of the GPL are applicable instead of the
 * above.  If you wish to allow the use of your version of this file
 * only under the terms of the GPL and not to allow others to use your
 * version of this file under the RHEPL, indicate your decision by
 * deleting the provisions above and replace them with the notice and
 * other provisions required by the GPL.  If you do not delete the
 * provisions above, a recipient may use your version of this file
 * under either the RHEPL or the GPL.
 *
 * $Id: background.c,v 1.1 2002/04/09 13:19:33 atp Exp $
 *
 */

#define __KERNEL_SYSCALLS__

#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/unistd.h>
#include <linux/jffs2.h>
#include <linux/mtd/mtd.h>
#include <linux/interrupt.h>
#include <linux/completion.h>
#include "nodelist.h"


static int jffs2_garbage_collect_thread(void *);
static int thread_should_wake(struct jffs2_sb_info *c);

void jffs2_garbage_collect_trigger(struct jffs2_sb_info *c)
{
	spin_lock_bh(&c->erase_completion_lock);
        if (c->gc_task && thread_should_wake(c))
                send_sig(SIGHUP, c->gc_task, 1);
	spin_unlock_bh(&c->erase_completion_lock);
}

/* This must only ever be called when no GC thread is currently running */
int jffs2_start_garbage_collect_thread(struct jffs2_sb_info *c)
{
	pid_t pid;
	int ret = 0;

	if (c->gc_task)
		BUG();

	init_MUTEX_LOCKED(&c->gc_thread_start);
	init_completion(&c->gc_thread_exit);

	pid = kernel_thread(jffs2_garbage_collect_thread, c, CLONE_FS|CLONE_FILES);
	if (pid < 0) {
		printk(KERN_WARNING "fork failed for JFFS2 garbage collect thread: %d\n", -pid);
		complete(&c->gc_thread_exit);
		ret = pid;
	} else {
		/* Wait for it... */
		D1(printk(KERN_DEBUG "JFFS2: Garbage collect thread is pid %d\n", pid));
		down(&c->gc_thread_start);
	}
 
	return ret;
}

void jffs2_stop_garbage_collect_thread(struct jffs2_sb_info *c)
{
	spin_lock_bh(&c->erase_completion_lock);
	if (c->gc_task) {
		D1(printk(KERN_DEBUG "jffs2: Killing GC task %d\n", c->gc_task->pid));
		send_sig(SIGKILL, c->gc_task, 1);
	}
	spin_unlock_bh(&c->erase_completion_lock);
	wait_for_completion(&c->gc_thread_exit);
}

static int jffs2_garbage_collect_thread(void *_c)
{
	struct jffs2_sb_info *c = _c;

	daemonize();
	current->tty = NULL;
	c->gc_task = current;
	up(&c->gc_thread_start);

        sprintf(current->comm, "jffs2_gcd_mtd%d", c->mtd->index);

	/* FIXME in the 2.2 backport */
	current->nice = 10;

	for (;;) {
		spin_lock_irq(&current->sigmask_lock);
		siginitsetinv (&current->blocked, sigmask(SIGHUP) | sigmask(SIGKILL) | sigmask(SIGSTOP) | sigmask(SIGCONT));
		recalc_sigpending(current);
		spin_unlock_irq(&current->sigmask_lock);

		if (!thread_should_wake(c)) {
                        set_current_state (TASK_INTERRUPTIBLE);
			D1(printk(KERN_DEBUG "jffs2_garbage_collect_thread sleeping...\n"));
			/* Yes, there's a race here; we checked thread_should_wake() before
			   setting current->state to TASK_INTERRUPTIBLE. But it doesn't
			   matter - We don't care if we miss a wakeup, because the GC thread
			   is only an optimisation anyway. */
			schedule();
		}
                
		if (current->need_resched)
			schedule();

                /* Put_super will send a SIGKILL and then wait on the sem. 
                 */
                while (signal_pending(current)) {
                        siginfo_t info;
                        unsigned long signr;

                        spin_lock_irq(&current->sigmask_lock);
                        signr = dequeue_signal(&current->blocked, &info);
                        spin_unlock_irq(&current->sigmask_lock);

                        switch(signr) {
                        case SIGSTOP:
                                D1(printk(KERN_DEBUG "jffs2_garbage_collect_thread(): SIGSTOP received.\n"));
                                set_current_state(TASK_STOPPED);
                                schedule();
                                break;

                        case SIGKILL:
                                D1(printk(KERN_DEBUG "jffs2_garbage_collect_thread(): SIGKILL received.\n"));
				spin_lock_bh(&c->erase_completion_lock);
                                c->gc_task = NULL;
				spin_unlock_bh(&c->erase_completion_lock);
				complete_and_exit(&c->gc_thread_exit, 0);

			case SIGHUP:
				D1(printk(KERN_DEBUG "jffs2_garbage_collect_thread(): SIGHUP received.\n"));
				break;
			default:
				D1(printk(KERN_DEBUG "jffs2_garbage_collect_thread(): signal %ld received\n", signr));

                        }
                }
		/* We don't want SIGHUP to interrupt us. STOP and KILL are OK though. */
		spin_lock_irq(&current->sigmask_lock);
		siginitsetinv (&current->blocked, sigmask(SIGKILL) | sigmask(SIGSTOP) | sigmask(SIGCONT));
		recalc_sigpending(current);
		spin_unlock_irq(&current->sigmask_lock);

		D1(printk(KERN_DEBUG "jffs2_garbage_collect_thread(): pass\n"));
		jffs2_garbage_collect_pass(c);
	}
}

static int thread_should_wake(struct jffs2_sb_info *c)
{
	D1(printk(KERN_DEBUG "thread_should_wake(): nr_free_blocks %d, nr_erasing_blocks %d, dirty_size 0x%x\n", 
		  c->nr_free_blocks, c->nr_erasing_blocks, c->dirty_size));
	if (c->nr_free_blocks + c->nr_erasing_blocks < JFFS2_RESERVED_BLOCKS_GCTRIGGER &&
	    c->dirty_size > c->sector_size)
		return 1;
	else 
		return 0;
}

--- NEW FILE ---
/*
 * JFFS2 -- Journalling Flash File System, Version 2.
 *
 * Copyright (C) 2001 Red Hat, Inc.
 *
 * Created by David Woodhouse <dw...@ca...>
 *
 * The original JFFS, from which the design for JFFS2 was derived,
 * was designed and implemented by Axis Communications AB.
 *
 * The contents of this file are subject to the Red Hat eCos Public
 * License Version 1.1 (the "Licence"); you may not use this file
 * except in compliance with the Licence.  You may obtain a copy of
 * the Licence at http://www.redhat.com/
 *
 * Software distributed under the Licence is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing rights and
 * limitations under the Licence.
 *
 * The Original Code is JFFS2 - Journalling Flash File System, version 2
 *
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License version 2 (the "GPL"), in
 * which case the provisions of the GPL are applicable instead of the
 * above.  If you wish to allow the use of your version of this file
 * only under the terms of the GPL and not to allow others to use your
 * version of this file under the RHEPL, indicate your decision by
 * deleting the provisions above and replace them with the notice and
 * other provisions required by the GPL.  If you do not delete the
 * provisions above, a recipient may use your version of this file
 * under either the RHEPL or the GPL.
 *
 * $Id: build.c,v 1.1 2002/04/09 13:19:33 atp Exp $
 *
 */

#include <linux/kernel.h>
#include <linux/jffs2.h>
#include <linux/slab.h>
#include "nodelist.h"

int jffs2_build_inode_pass1(struct jffs2_sb_info *, struct jffs2_inode_cache *);
int jffs2_build_remove_unlinked_inode(struct jffs2_sb_info *, struct jffs2_inode_cache *);


#define for_each_inode(i, c, ic) for (i=0; i<INOCACHE_HASHSIZE; i++) for (ic=c->inocache_list[i]; ic; ic=ic->next) 

/* Scan plan:
 - Scan physical nodes. Build map of inodes/dirents. Allocate inocaches as we go
 - Scan directory tree from top down, setting nlink in inocaches
 - Scan inocaches for inodes with nlink==0
*/
int jffs2_build_filesystem(struct jffs2_sb_info *c)
{
	int ret;
	int i;
	struct jffs2_inode_cache *ic;

	/* First, scan the medium and build all the inode caches with
	   lists of physical nodes */
	ret = jffs2_scan_medium(c);
	if (ret)
		return ret;

	D1(printk(KERN_DEBUG "Scanned flash completely\n"));
	/* Now build the data map for each inode, marking obsoleted nodes
	   as such, and also increase nlink of any children. */
	for_each_inode(i, c, ic) {
		D1(printk(KERN_DEBUG "Pass 1: ino #%u\n", ic->ino));
		ret = jffs2_build_inode_pass1(c, ic);
		if (ret) {
			D1(printk(KERN_WARNING "Eep. jffs2_build_inode_pass1 for ino %d returned %d\n", ic->ino, ret));
			return ret;
		}
	}
	D1(printk(KERN_DEBUG "Pass 1 complete\n"));

	/* Next, scan for inodes with nlink == 0 and remove them. If
	   they were directories, then decrement the nlink of their
	   children too, and repeat the scan. As that's going to be
	   a fairly uncommon occurrence, it's not so evil to do it this
	   way. Recursion bad. */
	do { 
		D1(printk(KERN_DEBUG "Pass 2 (re)starting\n"));
		ret = 0;
		for_each_inode(i, c, ic) {
			D1(printk(KERN_DEBUG "Pass 2: ino #%u, nlink %d, ic %p, nodes %p\n", ic->ino, ic->nlink, ic, ic->nodes));
			if (ic->nlink)
				continue;
			
			ret = jffs2_build_remove_unlinked_inode(c, ic);
			if (ret)
				break;
		/* -EAGAIN means the inode's nlink was zero, so we deleted it,
		   and furthermore that it had children and their nlink has now
		   gone to zero too. So we have to restart the scan. */
		} 
	} while(ret == -EAGAIN);
	
	D1(printk(KERN_DEBUG "Pass 2 complete\n"));
	
	/* Finally, we can scan again and free the dirent nodes and scan_info structs */
	for_each_inode(i, c, ic) {
		struct jffs2_scan_info *scan = ic->scan;
		struct jffs2_full_dirent *fd;
		D1(printk(KERN_DEBUG "Pass 3: ino #%u, ic %p, nodes %p\n", ic->ino, ic, ic->nodes));
		if (!scan) {
			if (ic->nlink) {
				D1(printk(KERN_WARNING "Why no scan struct for ino #%u which has nlink %d?\n", ic->ino, ic->nlink));
			}
			continue;
		}
		ic->scan = NULL;
		while(scan->dents) {
			fd = scan->dents;
			scan->dents = fd->next;
			jffs2_free_full_dirent(fd);
		}
		kfree(scan);
	}
	D1(printk(KERN_DEBUG "Pass 3 complete\n"));

	return ret;
}
	
int jffs2_build_inode_pass1(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic)
{
	struct jffs2_tmp_dnode_info *tn;
	struct jffs2_full_dirent *fd;
	struct jffs2_node_frag *fraglist = NULL;
	struct jffs2_tmp_dnode_info *metadata = NULL;

	D1(printk(KERN_DEBUG "jffs2_build_inode building inode #%u\n", ic->ino));
	if (ic->ino > c->highest_ino)
		c->highest_ino = ic->ino;

	if (!ic->scan->tmpnodes && ic->ino != 1) {
		D1(printk(KERN_DEBUG "jffs2_build_inode: ino #%u has no data nodes!\n", ic->ino));
	}
	/* Build the list to make sure any obsolete nodes are marked as such */
	while(ic->scan->tmpnodes) {
		tn = ic->scan->tmpnodes;
		ic->scan->tmpnodes = tn->next;
		
		if (metadata && tn->version > metadata->version) {
			D1(printk(KERN_DEBUG "jffs2_build_inode_pass1 ignoring old metadata at 0x%08x\n",
				  metadata->fn->raw->flash_offset &~3));
			
			jffs2_free_full_dnode(metadata->fn);
			jffs2_free_tmp_dnode_info(metadata);
			metadata = NULL;
		}
			
		if (tn->fn->size) {
			jffs2_add_full_dnode_to_fraglist (c, &fraglist, tn->fn);
			jffs2_free_tmp_dnode_info(tn);
		} else {
			if (!metadata) {
				metadata = tn;
			} else {
				D1(printk(KERN_DEBUG "jffs2_build_inode_pass1 ignoring new metadata at 0x%08x\n",
					  tn->fn->raw->flash_offset &~3));
				
				jffs2_free_full_dnode(tn->fn);
				jffs2_free_tmp_dnode_info(tn);
			}
		}
	}
		
	/* OK. Now clear up */
	if (metadata) {
		jffs2_free_full_dnode(metadata->fn);
		jffs2_free_tmp_dnode_info(metadata);
	}
	metadata = NULL;
	
	while (fraglist) {
		struct jffs2_node_frag *frag;
		frag = fraglist;
		fraglist = fraglist->next;
		
		if (frag->node && !(--frag->node->frags)) {
			jffs2_free_full_dnode(frag->node);
		}
		jffs2_free_node_frag(frag);
	}

	/* Now for each child, increase nlink */
	for(fd=ic->scan->dents; fd; fd = fd->next) {
		struct jffs2_inode_cache *child_ic;
		if (!fd->ino)
			continue;

		child_ic = jffs2_get_ino_cache(c, fd->ino);
		if (!child_ic) {
			printk(KERN_NOTICE "Eep. Child \"%s\" (ino #%u) of dir ino #%u doesn't exist!\n",
				  fd->name, fd->ino, ic->ino);
			continue;
		}

		if (child_ic->nlink++ && fd->type == DT_DIR) {
			printk(KERN_NOTICE "Child dir \"%s\" (ino #%u) of dir ino #%u appears to be a hard link\n", fd->name, fd->ino, ic->ino);
			/* What do we do about it? */
		}
		D1(printk(KERN_DEBUG "Increased nlink for child \"%s\" (ino #%u)\n", fd->name, fd->ino));
		/* Can't free them. We might need them in pass 2 */
	}
	return 0;
}

int jffs2_build_remove_unlinked_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic)
{
	struct jffs2_raw_node_ref *raw;
	struct jffs2_full_dirent *fd;
	int ret = 0;

	if(!ic->scan) {
		D1(printk(KERN_DEBUG "ino #%u was already removed\n", ic->ino));
		return 0;
	}

	D1(printk(KERN_DEBUG "JFFS2: Removing ino #%u with nlink == zero.\n", ic->ino));
	
	for (raw = ic->nodes; raw != (void *)ic; raw = raw->next_in_ino) {
		D1(printk(KERN_DEBUG "obsoleting node at 0x%08x\n", raw->flash_offset&~3));
		jffs2_mark_node_obsolete(c, raw);
	}

	if (ic->scan->dents) {
		printk(KERN_NOTICE "Inode #%u was a directory with children - removing those too...\n", ic->ino);
	
		while(ic->scan->dents) {
			struct jffs2_inode_cache *child_ic;

			fd = ic->scan->dents;
			ic->scan->dents = fd->next;

			D1(printk(KERN_DEBUG "Removing child \"%s\", ino #%u\n",
				  fd->name, fd->ino));
			
			child_ic = jffs2_get_ino_cache(c, fd->ino);
			if (!child_ic) {
				printk(KERN_NOTICE "Cannot remove child \"%s\", ino #%u, because it doesn't exist\n", fd->name, fd->ino);
				continue;
			}
			jffs2_free_full_dirent(fd);
			child_ic->nlink--;
		}
		ret = -EAGAIN;
	}
	kfree(ic->scan);
	ic->scan = NULL;
	//	jffs2_del_ino_cache(c, ic);
	//	jffs2_free_inode_cache(ic);
	return ret;
}

--- NEW FILE ---
/*
 * JFFS2 -- Journalling Flash File System, Version 2.
 *
 * Copyright (C) 2001 Red Hat, Inc.
 *
 * Created by Arjan van de Ven <ar...@re...>
 *
 * The original JFFS, from which the design for JFFS2 was derived,
 * was designed and implemented by Axis Communications AB.
 *
 * The contents of this file are subject to the Red Hat eCos Public
 * License Version 1.1 (the "Licence"); you may not use this file
 * except in compliance with the Licence.  You may obtain a copy of
 * the Licence at http://www.redhat.com/
 *
 * Software distributed under the Licence is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing rights and
 * limitations under the Licence.
 *
 * The Original Code is JFFS2 - Journalling Flash File System, version 2
 *
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License version 2 (the "GPL"), in
 * which case the provisions of the GPL are applicable instead of the
 * above.  If you wish to allow the use of your version of this file
 * only under the terms of the GPL and not to allow others to use your
 * version of this file under the RHEPL, indicate your decision by
 * deleting the provisions above and replace them with the notice and
 * other provisions required by the GPL.  If you do not delete the
 * provisions above, a recipient may use your version of this file
 * under either the RHEPL or the GPL.
 *
 * $Id: compr.c,v 1.1 2002/04/09 13:19:34 atp Exp $
 *
 */

#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/jffs2.h>

int zlib_compress(unsigned char *data_in, unsigned char *cpage_out, __u32 *sourcelen, __u32 *dstlen);
void zlib_decompress(unsigned char *data_in, unsigned char *cpage_out, __u32 srclen, __u32 destlen);
int rtime_compress(unsigned char *data_in, unsigned char *cpage_out, __u32 *sourcelen, __u32 *dstlen);
void rtime_decompress(unsigned char *data_in, unsigned char *cpage_out, __u32 srclen, __u32 destlen);
int rubinmips_compress(unsigned char *data_in, unsigned char *cpage_out, __u32 *sourcelen, __u32 *dstlen);
void rubinmips_decompress(unsigned char *data_in, unsigned char *cpage_out, __u32 srclen, __u32 destlen);
int dynrubin_compress(unsigned char *data_in, unsigned char *cpage_out, __u32 *sourcelen, __u32 *dstlen);
void dynrubin_decompress(unsigned char *data_in, unsigned char *cpage_out, __u32 srclen, __u32 destlen);


/* jffs2_compress:
 * @data: Pointer to uncompressed data
 * @cdata: Pointer to buffer for compressed data
 * @datalen: On entry, holds the amount of data available for compression.
 *	On exit, expected to hold the amount of data actually compressed.
 * @cdatalen: On entry, holds the amount of space available for compressed
 *	data. On exit, expected to hold the actual size of the compressed
 *	data.
 *
 * Returns: Byte to be stored with data indicating compression type used.
 * Zero is used to show that the data could not be compressed - the 
 * compressed version was actually larger than the original.
 *
 * If the cdata buffer isn't large enough to hold all the uncompressed data,
 * jffs2_compress should compress as much as will fit, and should set 
 * *datalen accordingly to show the amount of data which were compressed.
 */
unsigned char jffs2_compress(unsigned char *data_in, unsigned char *cpage_out, 
		    __u32 *datalen, __u32 *cdatalen)
{
	int ret;

	ret = zlib_compress(data_in, cpage_out, datalen, cdatalen);
	if (!ret) {
		return JFFS2_COMPR_ZLIB;
	}
#if 0 /* Disabled 23/9/1. With zlib it hardly ever gets a look in */
	ret = dynrubin_compress(data_in, cpage_out, datalen, cdatalen);
	if (!ret) {
		return JFFS2_COMPR_DYNRUBIN;
	}
#endif
#if 0 /* Disabled 26/2/1. Obsoleted by dynrubin */
	ret = rubinmips_compress(data_in, cpage_out, datalen, cdatalen);
	if (!ret) {
		return JFFS2_COMPR_RUBINMIPS;
	}
#endif
	/* rtime does manage to recompress already-compressed data */
	ret = rtime_compress(data_in, cpage_out, datalen, cdatalen);
	if (!ret) {
		return JFFS2_COMPR_RTIME;
	}
#if 0
	/* We don't need to copy. Let the caller special-case the COMPR_NONE case. */
	/* If we get here, no compression is going to work */
	/* But we might want to use the fragmentation part -- Arjan */
	memcpy(cpage_out,data_in,min(*datalen,*cdatalen));
	if (*datalen > *cdatalen)
		*datalen = *cdatalen;
#endif		
	return JFFS2_COMPR_NONE; /* We failed to compress */

}


int jffs2_decompress(unsigned char comprtype, unsigned char *cdata_in, 
		     unsigned char *data_out, __u32 cdatalen, __u32 datalen)
{
	switch (comprtype) {
	case JFFS2_COMPR_NONE:
		/* This should be special-cased elsewhere, but we might as well deal with it */
		memcpy(data_out, cdata_in, datalen);
		break;

	case JFFS2_COMPR_ZERO:
		memset(data_out, 0, datalen);
		break;

	case JFFS2_COMPR_ZLIB:
		zlib_decompress(cdata_in, data_out, cdatalen, datalen);
		break;

	case JFFS2_COMPR_RTIME:
		rtime_decompress(cdata_in, data_out, cdatalen, datalen);
		break;

	case JFFS2_COMPR_RUBINMIPS:
#if 0 /* Disabled 23/9/1 */
		rubinmips_decompress(cdata_in, data_out, cdatalen, datalen);
#else
		printk(KERN_WARNING "JFFS2: Rubinmips compression encountered but support not compiled in!\n");
#endif
		break;
	case JFFS2_COMPR_DYNRUBIN:
#if 1 /* Phase this one out */
		dynrubin_decompress(cdata_in, data_out, cdatalen, datalen);
#else
		printk(KERN_WARNING "JFFS2: Dynrubin compression encountered but support not compiled in!\n");
#endif
		break;

	default:
		printk(KERN_NOTICE "Unknown JFFS2 compression type 0x%02x\n", comprtype);
		return -EIO;
	}
	return 0;
}

--- NEW FILE ---
/*
 * JFFS2 -- Journalling Flash File System, Version 2.
 *
 * Copyright (C) 2001 Red Hat, Inc.
 *
 * Created by Arjan van de Ven <ar...@re...>
 *
 * The original JFFS, from which the design for JFFS2 was derived,
 * was designed and implemented by Axis Communications AB.
 *
 * The contents of this file are subject to the Red Hat eCos Public
 * License Version 1.1 (the "Licence"); you may not use this file
 * except in compliance with the Licence.  You may obtain a copy of
 * the Licence at http://www.redhat.com/
 *
 * Software distributed under the Licence is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing rights and
 * limitations under the Licence.
 *
 * The Original Code is JFFS2 - Journalling Flash File System, version 2
 *
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License version 2 (the "GPL"), in
 * which case the provisions of the GPL are applicable instead of the
 * above.  If you wish to allow the use of your version of this file
 * only under the terms of the GPL and not to allow others to use your
 * version of this file under the RHEPL, indicate your decision by
 * deleting the provisions above and replace them with the notice and
 * other provisions required by the GPL.  If you do not delete the
 * provisions above, a recipient may use your version of this file
 * under either the RHEPL or the GPL.
 *
 * $Id: compr_rtime.c,v 1.1 2002/04/09 13:19:34 atp Exp $
 *
 *
 * Very simple lz77-ish encoder.
 *
 * Theory of operation: Both encoder and decoder have a list of "last
 * occurances" for every possible source-value; after sending the
 * first source-byte, the second byte indicated the "run" length of
 * matches
 *
 * The algorithm is intended to only send "whole bytes", no bit-messing.
 *
 */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/string.h> 

/* _compress returns the compressed size, -1 if bigger */
int rtime_compress(unsigned char *data_in, unsigned char *cpage_out, 
		   __u32 *sourcelen, __u32 *dstlen)
{
	int positions[256];
	int outpos = 0;
	int pos=0;

	memset(positions,0,sizeof(positions)); 
	
	while (pos < (*sourcelen) && outpos <= (*dstlen)-2) {
		int backpos, runlen=0;
		unsigned char value;
		
		value = data_in[pos];

		cpage_out[outpos++] = data_in[pos++];
		
		backpos = positions[value];
		positions[value]=pos;
		
		while ((backpos < pos) && (pos < (*sourcelen)) &&
		       (data_in[pos]==data_in[backpos++]) && (runlen<255)) {
			pos++;
			runlen++;
		}
		cpage_out[outpos++] = runlen;
	}

	if (outpos >= pos) {
		/* We failed */
		return -1;
	}
	
	/* Tell the caller how much we managed to compress, and how much space it took */
	*sourcelen = pos;
	*dstlen = outpos;
	return 0;
}		   


void rtime_decompress(unsigned char *data_in, unsigned char *cpage_out,
		      __u32 srclen, __u32 destlen)
{
	int positions[256];
	int outpos = 0;
	int pos=0;
	
	memset(positions,0,sizeof(positions)); 
	
	while (outpos<destlen) {
		unsigned char value;
		int backoffs;
		int repeat;
		
		value = data_in[pos++];
		cpage_out[outpos++] = value; /* first the verbatim copied byte */
		repeat = data_in[pos++];
		backoffs = positions[value];
		
		positions[value]=outpos;
		if (repeat) {
			if (backoffs + repeat >= outpos) {
				while(repeat) {
					cpage_out[outpos++] = cpage_out[backoffs++];
					repeat--;
				}
			} else {
				memcpy(&cpage_out[outpos],&cpage_out[backoffs],repeat);
				outpos+=repeat;		
			}
		}
	}		
}		   



--- NEW FILE ---
/*
 * JFFS2 -- Journalling Flash File System, Version 2.
 *
 * Copyright (C) 2001 Red Hat, Inc.
 *
 * Created by Arjan van de Ven <ar...@re...>
 *
 * The original JFFS, from which the design for JFFS2 was derived,
 * was designed and implemented by Axis Communications AB.
 *
 * The contents of this file are subject to the Red Hat eCos Public
 * License Version 1.1 (the "Licence"); you may not use this file
 * except in compliance with the Licence.  You may obtain a copy of
 * the Licence at http://www.redhat.com/
 *
 * Software distributed under the Licence is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing rights and
 * limitations under the Licence.
 *
 * The Original Code is JFFS2 - Journalling Flash File System, version 2
 *
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License version 2 (the "GPL"), in
 * which case the provisions of the GPL are applicable instead of the
 * above.  If you wish to allow the use of your version of this file
 * only under the terms of the GPL and not to allow others to use your
 * version of this file under the RHEPL, indicate your decision by
 * deleting the provisions above and replace them with the notice and
 * other provisions required by the GPL.  If you do not delete the
 * provisions above, a recipient may use your version of this file
 * under either the RHEPL or the GPL.
 *
 * $Id: compr_rubin.c,v 1.1 2002/04/09 13:19:34 atp Exp $
 *
 */

 
#include <linux/string.h>
#include <linux/types.h>
#include "compr_rubin.h"
#include "histo_mips.h"



void init_rubin(struct rubin_state *rs, int div, int *bits)
{	
	int c;

	rs->q = 0;
	rs->p = (long) (2 * UPPER_BIT_RUBIN);
	rs->bit_number = (long) 0;
	rs->bit_divider = div;
	for (c=0; c<8; c++)
		rs->bits[c] = bits[c];
}


int encode(struct rubin_state *rs, long A, long B, int symbol)
{

	long i0, i1;
	int ret;

	while ((rs->q >= UPPER_BIT_RUBIN) || ((rs->p + rs->q) <= UPPER_BIT_RUBIN)) {
		rs->bit_number++;
		
		ret = pushbit(&rs->pp, (rs->q & UPPER_BIT_RUBIN) ? 1 : 0, 0);
		if (ret)
			return ret;
		rs->q &= LOWER_BITS_RUBIN;
		rs->q <<= 1;
		rs->p <<= 1;
	}
	i0 = A * rs->p / (A + B);
	if (i0 <= 0) {
		i0 = 1;
	}
	if (i0 >= rs->p) {
		i0 = rs->p - 1;
	}
	i1 = rs->p - i0;

	if (symbol == 0)
		rs->p = i0;
	else {
		rs->p = i1;
		rs->q += i0;
	}
	return 0;
}


void end_rubin(struct rubin_state *rs)
{				

	int i;

	for (i = 0; i < RUBIN_REG_SIZE; i++) {
		pushbit(&rs->pp, (UPPER_BIT_RUBIN & rs->q) ? 1 : 0, 1);
		rs->q &= LOWER_BITS_RUBIN;
		rs->q <<= 1;
	}
}


void init_decode(struct rubin_state *rs, int div, int *bits)
{
	init_rubin(rs, div, bits);		

	/* behalve lower */
	rs->rec_q = 0;

	for (rs->bit_number = 0; rs->bit_number++ < RUBIN_REG_SIZE; rs->rec_q = rs->rec_q * 2 + (long) (pullbit(&rs->pp)))
		;
}

static void __do_decode(struct rubin_state *rs, unsigned long p, unsigned long q)
{
	register unsigned long lower_bits_rubin = LOWER_BITS_RUBIN;
	unsigned long rec_q;
	int c, bits = 0;

	/*
	 * First, work out how many bits we need from the input stream.
	 * Note that we have already done the initial check on this
	 * loop prior to calling this function.
	 */
	do {
		bits++;
		q &= lower_bits_rubin;
		q <<= 1;
		p <<= 1;
	} while ((q >= UPPER_BIT_RUBIN) || ((p + q) <= UPPER_BIT_RUBIN));

	rs->p = p;
	rs->q = q;

	rs->bit_number += bits;

	/*
	 * Now get the bits.  We really want this to be "get n bits".
	 */
	rec_q = rs->rec_q;
	do {
		c = pullbit(&rs->pp);
		rec_q &= lower_bits_rubin;
		rec_q <<= 1;
		rec_q += c;
	} while (--bits);
	rs->rec_q = rec_q;
}

int decode(struct rubin_state *rs, long A, long B)
{
	unsigned long p = rs->p, q = rs->q;
	long i0, threshold;
	int symbol;

	if (q >= UPPER_BIT_RUBIN || ((p + q) <= UPPER_BIT_RUBIN))
		__do_decode(rs, p, q);

	i0 = A * rs->p / (A + B);
	if (i0 <= 0) {
		i0 = 1;
	}
	if (i0 >= rs->p) {
		i0 = rs->p - 1;
	}

	threshold = rs->q + i0;
	symbol = rs->rec_q >= threshold;
	if (rs->rec_q >= threshold) {
		rs->q += i0;
		i0 = rs->p - i0;
	}

	rs->p = i0;

	return symbol;
}



static int out_byte(struct rubin_state *rs, unsigned char byte)
{
	int i, ret;
	struct rubin_state rs_copy;
	rs_copy = *rs;

	for (i=0;i<8;i++) {
		ret = encode(rs, rs->bit_divider-rs->bits[i],rs->bits[i],byte&1);
		if (ret) {
			/* Failed. Restore old state */
			*rs = rs_copy;
			return ret;
		}
		byte=byte>>1;
	}
	return 0;
}

static int in_byte(struct rubin_state *rs)
{
	int i, result = 0, bit_divider = rs->bit_divider;

	for (i = 0; i < 8; i++)
		result |= decode(rs, bit_divider - rs->bits[i], rs->bits[i]) << i;

	return result;
}



int rubin_do_compress(int bit_divider, int *bits, unsigned char *data_in, 
		      unsigned char *cpage_out, __u32 *sourcelen, __u32 *dstlen)
	{
	int outpos = 0;
	int pos=0;
	struct rubin_state rs;

	init_pushpull(&rs.pp, cpage_out, *dstlen * 8, 0, 32);

	init_rubin(&rs, bit_divider, bits);
	
	while (pos < (*sourcelen) && !out_byte(&rs, data_in[pos]))
		pos++;
	
	end_rubin(&rs);

	if (outpos > pos) {
		/* We failed */
		return -1;
	}
	
	/* Tell the caller how much we managed to compress, 
	 * and how much space it took */
	
	outpos = (pushedbits(&rs.pp)+7)/8;
	
	if (outpos >= pos)
		return -1; /* We didn't actually compress */
	*sourcelen = pos;
	*dstlen = outpos;
	return 0;
}		   
#if 0
/* _compress returns the compressed size, -1 if bigger */
int rubinmips_compress(unsigned char *data_in, unsigned char *cpage_out, 
		   __u32 *sourcelen, __u32 *dstlen)
{
	return rubin_do_compress(BIT_DIVIDER_MIPS, bits_mips, data_in, cpage_out, sourcelen, dstlen);
}
#endif
int dynrubin_compress(unsigned char *data_in, unsigned char *cpage_out, 
		   __u32 *sourcelen, __u32 *dstlen)
{
	int bits[8];
	unsigned char histo[256];
	int i;
	int ret;
	__u32 mysrclen, mydstlen;

	mysrclen = *sourcelen;
	mydstlen = *dstlen - 8;

	if (*dstlen <= 12)
		return -1;

	memset(histo, 0, 256);
	for (i=0; i<mysrclen; i++) {
		histo[data_in[i]]++;
	}
	memset(bits, 0, sizeof(int)*8);
	for (i=0; i<256; i++) {
		if (i&128)
			bits[7] += histo[i];
		if (i&64)
			bits[6] += histo[i];
		if (i&32)
			bits[5] += histo[i];
		if (i&16)
			bits[4] += histo[i];
		if (i&8)
			bits[3] += histo[i];
		if (i&4)
			bits[2] += histo[i];
		if (i&2)
			bits[1] += histo[i];
		if (i&1)
			bits[0] += histo[i];
	}

	for (i=0; i<8; i++) {
		bits[i] = (bits[i] * 256) / mysrclen;
		if (!bits[i]) bits[i] = 1;
		if (bits[i] > 255) bits[i] = 255;
		cpage_out[i] = bits[i];
	}

	ret = rubin_do_compress(256, bits, data_in, cpage_out+8, &mysrclen, &mydstlen);
	if (ret) 
		return ret;

	/* Add back the 8 bytes we took for the probabilities */
	mydstlen += 8;

	if (mysrclen <= mydstlen) {
		/* We compressed */
		return -1;
	}

	*sourcelen = mysrclen;
	*dstlen = mydstlen;
	return 0;
}

void rubin_do_decompress(int bit_divider, int *bits, unsigned char *cdata_in, 
			 unsigned char *page_out, __u32 srclen, __u32 destlen)
{
	int outpos = 0;
	struct rubin_state rs;
	
	init_pushpull(&rs.pp, cdata_in, srclen, 0, 0);
	init_decode(&rs, bit_divider, bits);
	
	while (outpos < destlen) {
		page_out[outpos++] = in_byte(&rs);
	}
}		   


void rubinmips_decompress(unsigned char *data_in, unsigned char *cpage_out, 
		   __u32 sourcelen, __u32 dstlen)
{
	rubin_do_decompress(BIT_DIVIDER_MIPS, bits_mips, data_in, cpage_out, sourcelen, dstlen);
}

void dynrubin_decompress(unsigned char *data_in, unsigned char *cpage_out, 
		   __u32 sourcelen, __u32 dstlen)
{
	int bits[8];
	int c;

	for (c=0; c<8; c++)
		bits[c] = data_in[c];

	rubin_do_decompress(256, bits, data_in+8, cpage_out, sourcelen-8, dstlen);
}

--- NEW FILE ---
/* Rubin encoder/decoder header       */
/* work started at   : aug   3, 1994  */
/* last modification : aug  15, 1994  */
/* $Id: compr_rubin.h,v 1.1 2002/04/09 13:19:34 atp Exp $ */

#include "pushpull.h"

#define RUBIN_REG_SIZE   16
#define UPPER_BIT_RUBIN    (((long) 1)<<(RUBIN_REG_SIZE-1))
#define LOWER_BITS_RUBIN   ((((long) 1)<<(RUBIN_REG_SIZE-1))-1)


struct rubin_state {
	unsigned long p;		
	unsigned long q;	
	unsigned long rec_q;
	long bit_number;
	struct pushpull pp;
	int bit_divider;
	int bits[8];
};


void init_rubin (struct rubin_state *rs, int div, int *bits);
int encode (struct rubin_state *, long, long, int);
void end_rubin (struct rubin_state *);
void init_decode (struct rubin_state *, int div, int *bits);
int decode (struct rubin_state *, long, long);

--- NEW FILE ---
/*
 * JFFS2 -- Journalling Flash File System, Version 2.
 *
 * Copyright (C) 2001 Red Hat, Inc.
 *
 * Created by David Woodhouse <dw...@ca...>
 *
 * The original JFFS, from which the design for JFFS2 was derived,
 * was designed and implemented by Axis Communications AB.
 *
 * The contents of this file are subject to the Red Hat eCos Public
 * License Version 1.1 (the "Licence"); you may not use this file
 * except in compliance with the Licence.  You may obtain a copy of
 * the Licence at http://www.redhat.com/
 *
 * Software distributed under the Licence is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing rights and
 * limitations under the Licence.
 *
 * The Original Code is JFFS2 - Journalling Flash File System, version 2
 *
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License version 2 (the "GPL"), in
 * which case the provisions of the GPL are applicable instead of the
 * above.  If you wish to allow the use of your version of this file
 * only under the terms of the GPL and not to allow others to use your
 * version of this file under the RHEPL, indicate your decision by
 * deleting the provisions above and replace them with the notice and
 * other provisions required by the GPL.  If you do not delete the
 * provisions above, a recipient may use your version of this file
 * under either the RHEPL or the GPL.
 *
 * $Id: compr_zlib.c,v 1.1 2002/04/09 13:19:34 atp Exp $
 *
 */

#include "zlib.h"

#ifdef __KERNEL__
#include <linux/kernel.h>
#include <linux/mtd/compatmac.h> /* for min() */
#include <linux/slab.h>
#include <linux/jffs2.h>
#include "nodelist.h"

static void *zalloc(void *opaque, unsigned nr, unsigned size)
{
	/* How much does it request? Should we use vmalloc? Or be dynamic? */
	return kmalloc(nr * size, GFP_KERNEL);
}

static void zfree(void *opaque, void *addr)
{
	kfree(addr);
}
#else
#define min(x,y) ((x)<(y)?(x):(y))
#ifndef D1
#define D1(x)
#endif
#define KERN_DEBUG
#define KERN_NOTICE
#define KERN_WARNING
#define printk printf
#include <stdio.h>
#include <asm/types.h>
#endif

	/* Plan: call deflate() with avail_in == *sourcelen, 
		avail_out = *dstlen - 12 and flush == Z_FINISH. 
		If it doesn't manage to finish,	call it again with
		avail_in == 0 and avail_out set to the remaining 12
		bytes for it to clean up. 
	   Q: Is 12 bytes sufficient?
	*/
#define STREAM_END_SPACE 12

int zlib_compress(unsigned char *data_in, unsigned char *cpage_out, 
		   __u32 *sourcelen, __u32 *dstlen)
{
	z_stream strm;
	int ret;

	if (*dstlen <= STREAM_END_SPACE)
		return -1;

#ifdef __KERNEL__
	strm.zalloc = zalloc;
	strm.zfree = zfree;
#else
	strm.zalloc = (void *)0;
	strm.zfree = (void *)0;
#endif

	if (Z_OK != deflateInit(&strm, 3)) {
		printk(KERN_WARNING "deflateInit failed\n");
		return -1;
	}
	strm.next_in = data_in;
	strm.total_in = 0;
	
	strm.next_out = cpage_out;
	strm.total_out = 0;

	while (strm.total_out < *dstlen - STREAM_END_SPACE && strm.total_in < *sourcelen) {
		strm.avail_out = *dstlen - (strm.total_out + STREAM_END_SPACE);
		strm.avail_in = min((unsigned)(*sourcelen-strm.total_in), strm.avail_out);
		D1(printk(KERN_DEBUG "calling deflate with avail_in %d, avail_out %d\n",
			  strm.avail_in, strm.avail_out));
		ret = deflate(&strm, Z_PARTIAL_FLUSH);
		D1(printk(KERN_DEBUG "deflate returned with avail_in %d, avail_out %d, total_in %ld, total_out %ld\n", 
			  strm.avail_in, strm.avail_out, strm.total_in, strm.total_out));
		if (ret != Z_OK) {
			D1(printk(KERN_DEBUG "deflate in loop returned %d\n", ret));
			deflateEnd(&strm);
			return -1;
		}
	}
	strm.avail_out += STREAM_END_SPACE;
	strm.avail_in = 0;
	ret = deflate(&strm, Z_FINISH);
	if (ret != Z_STREAM_END) {
		D1(printk(KERN_DEBUG "final deflate returned %d\n", ret));
		deflateEnd(&strm);
		return -1;
	}
	deflateEnd(&strm);

	D1(printk(KERN_DEBUG "zlib compressed %ld bytes into %ld\n", strm.total_in, strm.total_out));

	if (strm.total_out >= strm.total_in)
		return -1;


	*dstlen = strm.total_out;
	*sourcelen = strm.total_in;
	return 0;
}

void zlib_decompress(unsigned char *data_in, unsigned char *cpage_out,
		      __u32 srclen, __u32 destlen)
{
	z_stream strm;
	int ret;

#ifdef __KERNEL__
	strm.zalloc = zalloc;
	strm.zfree = zfree;
#else
	strm.zalloc = (void *)0;
	strm.zfree = (void *)0;
#endif

	if (Z_OK != inflateInit(&strm)) {
		printk(KERN_WARNING "inflateInit failed\n");
		return;
	}
	strm.next_in = data_in;
	strm.avail_in = srclen;
	strm.total_in = 0;
	
	strm.next_out = cpage_out;
	strm.avail_out = destlen;
	strm.total_out = 0;

	while((ret = inflate(&strm, Z_FINISH)) == Z_OK)
		;
	if (ret != Z_STREAM_END) {
		printk(KERN_NOTICE "inflate returned %d\n", ret);
	}
	inflateEnd(&strm);
}

--- NEW FILE ---
/* $Id: comprtest.c,v 1.1 2002/04/09 13:19:34 atp Exp $ */

#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/module.h>
#include <asm/types.h>
#if 0
#define TESTDATA_LEN 512
static unsigned char testdata[TESTDATA_LEN] = {
 0x7f, 0x45, 0x4c, 0x46, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 0x02, 0x00, 0x03, 0x00, 0x01, 0x00, 0x00, 0x00, 0x60, 0x83, 0x04, 0x08, 0x34, 0x00, 0x00, 0x00,
 0xb0, 0x29, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x34, 0x00, 0x20, 0x00, 0x06, 0x00, 0x28, 0x00,
 0x1e, 0x00, 0x1b, 0x00, 0x06, 0x00, 0x00, 0x00, 0x34, 0x00, 0x00, 0x00, 0x34, 0x80, 0x04, 0x08,
 0x34, 0x80, 0x04, 0x08, 0xc0, 0x00, 0x00, 0x00, 0xc0, 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00,
 0x04, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0xf4, 0x00, 0x00, 0x00, 0xf4, 0x80, 0x04, 0x08,
 0xf4, 0x80, 0x04, 0x08, 0x13, 0x00, 0x00, 0x00, 0x13, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00,
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#else
#define TESTDATA_LEN 3481
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