readinode.c

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/*
 * JFFS2 -- Journalling Flash File System, Version 2.
 *
 * Copyright (C) 2001-2003 Red Hat, Inc.
 *
 * Created by David Woodhouse <[e-mail]>
 *
 * For licensing information, see the file 'LICENCE' in this directory.
 *
 * $Id: readinode.c,v 1.132 2005/07/28 14:46:40 dedekind Exp $
 *
 */

#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/crc32.h>
#include <linux/pagemap.h>
#include <linux/mtd/mtd.h>
#include <linux/compiler.h>
#include "nodelist.h"

void jffs2_truncate_fragtree (struct jffs2_sb_info *c, struct rb_root *list, uint32_t size)
{
	struct jffs2_node_frag *frag = jffs2_lookup_node_frag(list, size);

	JFFS2_DBG_FRAGTREE("truncating fragtree to 0x%08x bytes\n", size);

	/* We know frag->ofs <= size. That's what lookup does for us */
	if (frag && frag->ofs != size) {
		if (frag->ofs+frag->size >= size) {
			JFFS2_DBG_FRAGTREE2("truncating frag 0x%08x-0x%08x\n", frag->ofs, frag->ofs+frag->size);
			frag->size = size - frag->ofs;
		}
		frag = frag_next(frag);
	}
	while (frag && frag->ofs >= size) {
		struct jffs2_node_frag *next = frag_next(frag);

		JFFS2_DBG_FRAGTREE("removing frag 0x%08x-0x%08x\n", frag->ofs, frag->ofs+frag->size);
		frag_erase(frag, list);
		jffs2_obsolete_node_frag(c, frag);
		frag = next;
	}
}

/* 
 * Put a new tmp_dnode_info into the temporaty RB-tree, keeping the list in 
 * order of increasing version.
 */
static void jffs2_add_tn_to_tree(struct jffs2_tmp_dnode_info *tn, struct rb_root *list)
{
	struct rb_node **p = &list->rb_node;
	struct rb_node * parent = NULL;
	struct jffs2_tmp_dnode_info *this;

	while (*p) {
		parent = *p;
		this = rb_entry(parent, struct jffs2_tmp_dnode_info, rb);

		/* There may actually be a collision here, but it doesn't
		   actually matter. As long as the two nodes with the same
		   version are together, it's all fine. */
		if (tn->version < this->version)
			p = &(*p)->rb_left;
		else
			p = &(*p)->rb_right;
        }

	rb_link_node(&tn->rb, parent, p);
	rb_insert_color(&tn->rb, list);
}

static void jffs2_free_tmp_dnode_info_list(struct rb_root *list)
{
	struct rb_node *this;
	struct jffs2_tmp_dnode_info *tn;

	this = list->rb_node;

	/* Now at bottom of tree */
	while (this) {
		if (this->rb_left)
			this = this->rb_left;
		else if (this->rb_right)
			this = this->rb_right;
		else {
			tn = rb_entry(this, struct jffs2_tmp_dnode_info, rb);
			jffs2_free_full_dnode(tn->fn);
			jffs2_free_tmp_dnode_info(tn);

			this = this->rb_parent;
			if (!this)
				break;

			if (this->rb_left == &tn->rb)
				this->rb_left = NULL;
			else if (this->rb_right == &tn->rb)
				this->rb_right = NULL;
			else BUG();
		}
	}
	list->rb_node = NULL;
}

static void jffs2_free_full_dirent_list(struct jffs2_full_dirent *fd)
{
	struct jffs2_full_dirent *next;

	while (fd) {
		next = fd->next;
		jffs2_free_full_dirent(fd);
		fd = next;
	}
}

/* Returns first valid node after 'ref'. May return 'ref' */
static struct jffs2_raw_node_ref *jffs2_first_valid_node(struct jffs2_raw_node_ref *ref)
{
	while (ref && ref->next_in_ino) {
		if (!ref_obsolete(ref))
			return ref;
		JFFS2_DBG_NODEREF("node at 0x%08x is obsoleted. Ignoring.\n", ref_offset(ref));
		ref = ref->next_in_ino;
	}
	return NULL;
}

/*
 * Helper function for jffs2_get_inode_nodes().
 * It is called every time an directory entry node is found.
 *
 * Returns: 0 on succes;
 * 	    1 if the node should be marked obsolete;
 * 	    negative error code on failure.
 */
static inline int
read_direntry(struct jffs2_sb_info *c,
	      struct jffs2_raw_node_ref *ref,
	      struct jffs2_raw_dirent *rd,
	      uint32_t read,
	      struct jffs2_full_dirent **fdp,
	      int32_t *latest_mctime,
	      uint32_t *mctime_ver)
{
	struct jffs2_full_dirent *fd;
	
	/* The direntry nodes are checked during the flash scanning */
	BUG_ON(ref_flags(ref) == REF_UNCHECKED);
	/* Obsoleted. This cannot happen, surely? dwmw2 20020308 */
	BUG_ON(ref_obsolete(ref));
			
	/* Sanity check */
	if (unlikely(PAD((rd->nsize + sizeof(*rd))) != PAD(je32_to_cpu(rd->totlen)))) {
		JFFS2_ERROR("illegal nsize in node at %#08x: nsize %#02x, totlen %#04x\n",
		       ref_offset(ref), rd->nsize, je32_to_cpu(rd->totlen));
		return 1;
	}
	
	fd = jffs2_alloc_full_dirent(rd->nsize + 1);
	if (unlikely(!fd))
		return -ENOMEM;

	fd->raw = ref;
	fd->version = je32_to_cpu(rd->version);
	fd->ino = je32_to_cpu(rd->ino);
	fd->type = rd->type;

	/* Pick out the mctime of the latest dirent */
	if(fd->version > *mctime_ver) {
		*mctime_ver = fd->version;
		*latest_mctime = je32_to_cpu(rd->mctime);
	}

	/* 
	 * Copy as much of the name as possible from the raw
	 * dirent we've already read from the flash.
	 */
	if (read > sizeof(*rd))
		memcpy(&fd->name[0], &rd->name[0],
		       min_t(uint32_t, rd->nsize, (read - sizeof(*rd)) ));
		
	/* Do we need to copy any more of the name directly from the flash? */
	if (rd->nsize + sizeof(*rd) > read) {
		/* FIXME: point() */
		int err;
		int already = read - sizeof(*rd);
			
		err = jffs2_flash_read(c, (ref_offset(ref)) + read, 
				rd->nsize - already, &read, &fd->name[already]);
		if (unlikely(read != rd->nsize - already) && likely(!err))
			return -EIO;
			
		if (unlikely(err)) {
			JFFS2_ERROR("read remainder of name: error %d\n", err);
			jffs2_free_full_dirent(fd);
			return -EIO;
		}
	}
	
	fd->nhash = full_name_hash(fd->name, rd->nsize);
	fd->next = NULL;
	fd->name[rd->nsize] = '\0';
	
	/*
	 * Wheee. We now have a complete jffs2_full_dirent structure, with
	 * the name in it and everything. Link it into the list 
	 */
	jffs2_add_fd_to_list(c, fd, fdp);

	return 0;
}

/*
 * Helper function for jffs2_get_inode_nodes().
 * It is called every time an inode node is found.
 *
 * Returns: 0 on succes;
 * 	    1 if the node should be marked obsolete;
 * 	    negative error code on failure.
 */
static inline int
read_dnode(struct jffs2_sb_info *c,
	   struct jffs2_raw_node_ref *ref,
	   struct jffs2_raw_inode *rd,
	   uint32_t read,
	   struct rb_root *tnp,
	   int32_t *latest_mctime,
	   uint32_t *mctime_ver)
{
	struct jffs2_eraseblock *jeb;
	struct jffs2_tmp_dnode_info *tn;
	
	/* Obsoleted. This cannot happen, surely? dwmw2 20020308 */
	BUG_ON(ref_obsolete(ref));

	/* If we've never checked the CRCs on this node, check them now */
	if (ref_flags(ref) == REF_UNCHECKED) {
		uint32_t crc, len;

		crc = crc32(0, rd, sizeof(*rd) - 8);
		if (unlikely(crc != je32_to_cpu(rd->node_crc))) {
			JFFS2_NOTICE("header CRC failed on node at %#08x: read %#08x, calculated %#08x\n",
					ref_offset(ref), je32_to_cpu(rd->node_crc), crc);
			return 1;
		}
		
		/* Sanity checks */
		if (unlikely(je32_to_cpu(rd->offset) > je32_to_cpu(rd->isize)) ||
		    unlikely(PAD(je32_to_cpu(rd->csize) + sizeof(*rd)) != PAD(je32_to_cpu(rd->totlen)))) {
				JFFS2_WARNING("inode node header CRC is corrupted at %#08x\n", ref_offset(ref));
				jffs2_dbg_dump_node(c, ref_offset(ref));
			return 1;
		}

		if (rd->compr != JFFS2_COMPR_ZERO && je32_to_cpu(rd->csize)) {
			unsigned char *buf = NULL;
			uint32_t pointed = 0;
			int err;
#ifndef __ECOS
			if (c->mtd->point) {
				err = c->mtd->point (c->mtd, ref_offset(ref) + sizeof(*rd), je32_to_cpu(rd->csize),
						     &read, &buf);
				if (unlikely(read < je32_to_cpu(rd->csize)) && likely(!err)) {
					JFFS2_ERROR("MTD point returned len too short: 0x%zx\n", read);
					c->mtd->unpoint(c->mtd, buf, ref_offset(ref) + sizeof(*rd),
							je32_to_cpu(rd->csize));
				} else if (unlikely(err)){
					JFFS2_ERROR("MTD point failed %d\n", err);
				} else
					pointed = 1; /* succefully pointed to device */
			}
#endif					
			if(!pointed){
				buf = kmalloc(je32_to_cpu(rd->csize), GFP_KERNEL);
				if (!buf)
					return -ENOMEM;
				
				err = jffs2_flash_read(c, ref_offset(ref) + sizeof(*rd), je32_to_cpu(rd->csize),
							&read, buf);
				if (unlikely(read != je32_to_cpu(rd->csize)) && likely(!err))
					err = -EIO;
				if (err) {
					kfree(buf);
					return err;
				}
			}
			crc = crc32(0, buf, je32_to_cpu(rd->csize));
			if(!pointed)
				kfree(buf);
#ifndef __ECOS
			else
				c->mtd->unpoint(c->mtd, buf, ref_offset(ref) + sizeof(*rd), je32_to_cpu(rd->csize));
#endif

			if (crc != je32_to_cpu(rd->data_crc)) {
				JFFS2_NOTICE("data CRC failed on node at %#08x: read %#08x, calculated %#08x\n",
					ref_offset(ref), je32_to_cpu(rd->data_crc), crc);
				return 1;
			}
			
		}

		/* Mark the node as having been checked and fix the accounting accordingly */
		jeb = &c->blocks[ref->flash_offset / c->sector_size];
		len = ref_totlen(c, jeb, ref);

		spin_lock(&c->erase_completion_lock);
		jeb->used_size += len;
		jeb->unchecked_size -= len;
		c->used_size += len;
		c->unchecked_size -= len;

		/* If node covers at least a whole page, or if it starts at the 
		   beginning of a page and runs to the end of the file, or if 
		   it's a hole node, mark it REF_PRISTINE, else REF_NORMAL. 

		   If it's actually overlapped, it'll get made NORMAL (or OBSOLETE) 
		   when the overlapping node(s) get added to the tree anyway. 
		*/
		if ((je32_to_cpu(rd->dsize) >= PAGE_CACHE_SIZE) ||
		    ( ((je32_to_cpu(rd->offset) & (PAGE_CACHE_SIZE-1))==0) &&
		      (je32_to_cpu(rd->dsize) + je32_to_cpu(rd->offset) == je32_to_cpu(rd->isize)))) {
			JFFS2_DBG_READINODE("marking node at %#08x REF_PRISTINE\n", ref_offset(ref));
			ref->flash_offset = ref_offset(ref) | REF_PRISTINE;
		} else {
			JFFS2_DBG_READINODE("marking node at %#08x REF_NORMAL\n", ref_offset(ref));
			ref->flash_offset = ref_offset(ref) | REF_NORMAL;
		}
		spin_unlock(&c->erase_completion_lock);
	}

	tn = jffs2_alloc_tmp_dnode_info();
	if (!tn) {
		JFFS2_ERROR("alloc tn failed\n");
		return -ENOMEM;
	}

	tn->fn = jffs2_alloc_full_dnode();
	if (!tn->fn) {
		JFFS2_ERROR("alloc fn failed\n");
		jffs2_free_tmp_dnode_info(tn);
		return -ENOMEM;
	}
	
	tn->version = je32_to_cpu(rd->version);
	tn->fn->ofs = je32_to_cpu(rd->offset);
	tn->fn->raw = ref;
	
	/* There was a bug where we wrote hole nodes out with
	   csize/dsize swapped. Deal with it */
	if (rd->compr == JFFS2_COMPR_ZERO && !je32_to_cpu(rd->dsize) && je32_to_cpu(rd->csize))
		tn->fn->size = je32_to_cpu(rd->csize);
	else // normal case...
		tn->fn->size = je32_to_cpu(rd->dsize);

	JFFS2_DBG_READINODE("dnode @%08x: ver %u, offset %#04x, dsize %#04x\n",
		  ref_offset(ref), je32_to_cpu(rd->version), je32_to_cpu(rd->offset), je32_to_cpu(rd->dsize));
	
	jffs2_add_tn_to_tree(tn, tnp);

	return 0;
}

/*
 * Helper function for jffs2_get_inode_nodes().
 * It is called every time an unknown node is found.
 *
 * Returns: 0 on succes;
 * 	    1 if the node should be marked obsolete;
 * 	    negative error code on failure.
 */
static inline int
read_unknown(struct jffs2_sb_info *c,
	     struct jffs2_raw_node_ref *ref,
	     struct jffs2_unknown_node *un,
	     uint32_t read)
{
	/* We don't mark unknown nodes as REF_UNCHECKED */
	BUG_ON(ref_flags(ref) == REF_UNCHECKED);
	
	un->nodetype = cpu_to_je16(JFFS2_NODE_ACCURATE | je16_to_cpu(un->nodetype));

	if (crc32(0, un, sizeof(struct jffs2_unknown_node) - 4) != je32_to_cpu(un->hdr_crc)) {
		/* Hmmm. This should have been caught at scan time. */
		JFFS2_NOTICE("node header CRC failed at %#08x. But it must have been OK earlier.\n", ref_offset(ref));
		jffs2_dbg_dump_node(c, ref_offset(ref));
		return 1;
	} else {
		switch(je16_to_cpu(un->nodetype) & JFFS2_COMPAT_MASK) {

		case JFFS2_FEATURE_INCOMPAT:
			JFFS2_ERROR("unknown INCOMPAT nodetype %#04X at %#08x\n",
				je16_to_cpu(un->nodetype), ref_offset(ref));
			/* EEP */
			BUG();
			break;

		case JFFS2_FEATURE_ROCOMPAT:
			JFFS2_ERROR("unknown ROCOMPAT nodetype %#04X at %#08x\n",
					je16_to_cpu(un->nodetype), ref_offset(ref));
			BUG_ON(!(c->flags & JFFS2_SB_FLAG_RO));
			break;

		case JFFS2_FEATURE_RWCOMPAT_COPY:
			JFFS2_NOTICE("unknown RWCOMPAT_COPY nodetype %#04X at %#08x\n",
					je16_to_cpu(un->nodetype), ref_offset(ref));
			break;

		case JFFS2_FEATURE_RWCOMPAT_DELETE:
			JFFS2_NOTICE("unknown RWCOMPAT_DELETE nodetype %#04X at %#08x\n",
					je16_to_cpu(un->nodetype), ref_offset(ref));
			return 1;
		}
	}

	return 0;
}

/* Get tmp_dnode_info and full_dirent for all non-obsolete nodes associated
   with this ino, returning the former in order of version */

static int jffs2_get_inode_nodes(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
				 struct rb_root *tnp, struct jffs2_full_dirent **fdp,
				 uint32_t *highest_version, uint32_t *latest_mctime,
				 uint32_t *mctime_ver)
{
	struct jffs2_raw_node_ref *ref, *valid_ref;
	struct rb_root ret_tn = RB_ROOT;
	struct jffs2_full_dirent *ret_fd = NULL;
	union jffs2_node_union node;
	size_t retlen;
	int err;

	*mctime_ver = 0;
	
	JFFS2_DBG_READINODE("ino #%u\n", f->inocache->ino);

	spin_lock(&c->erase_completion_lock);

	valid_ref = jffs2_first_valid_node(f->inocache->nodes);

	if (!valid_ref && (f->inocache->ino != 1))
		JFFS2_WARNING("no valid nodes for ino #%u\n", f->inocache->ino);

	while (valid_ref) {
		/* We can hold a pointer to a non-obsolete node without the spinlock,