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/*

 * JFFS2 -- Journalling Flash File System, Version 2.

 *

 * Copyright (C) 2001, 2002 Red Hat, Inc.

 *

 * Created by David Woodhouse <dwmw2@cambridge.redhat.com>

 *

 * For licensing information, see the file 'LICENCE' in this directory.

 *

 * $Id: readinode.c,v 1.1.1.1 2004-02-14 13:29:20 phoenix Exp $

 *

 */

#include <linux/kernel.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"

static int jffs2_add_frag_to_fragtree(struct jffs2_sb_info *c, struct rb_root *list, struct jffs2_node_frag *newfrag);

#if CONFIG_JFFS2_FS_DEBUG >= 1

static void jffs2_print_fragtree(struct rb_root *list, int permitbug)

{

        struct jffs2_node_frag *this = frag_first(list);

        uint32_t lastofs = 0;

        int buggy = 0;

        while(this) {

                if (this->node)

                        printk(KERN_DEBUG "frag %04x-%04x: 0x%08x(%d) on flash (*%p). left (%p), right (%p), parent (%p)\n",

                               this->ofs, this->ofs+this->size, ref_offset(this->node->raw), ref_flags(this->node->raw),

                               this, frag_left(this), frag_right(this), frag_parent(this));

                else

                        printk(KERN_DEBUG "frag %04x-%04x: hole (*%p). left (%p} right (%p), parent (%p)\n", this->ofs,

                               this->ofs+this->size, this, frag_left(this), frag_right(this), frag_parent(this));

                if (this->ofs != lastofs)

                        buggy = 1;

                lastofs = this->ofs+this->size;

                this = frag_next(this);

        }

        if (buggy && !permitbug) {

                printk(KERN_CRIT "Frag tree got a hole in it\n");

                BUG();

        }

}

void jffs2_print_frag_list(struct jffs2_inode_info *f)

{

        jffs2_print_fragtree(&f->fragtree, 0);

        if (f->metadata) {

                printk(KERN_DEBUG "metadata at 0x%08x\n", ref_offset(f->metadata->raw));

        }

}

#endif /* D1 */

static void jffs2_obsolete_node_frag(struct jffs2_sb_info *c, struct jffs2_node_frag *this)

{

        if (this->node) {

                this->node->frags--;

                if (!this->node->frags) {

                        /* The node has no valid frags left. It's totally obsoleted */

                        D2(printk(KERN_DEBUG "Marking old node @0x%08x (0x%04x-0x%04x) obsolete\n",

                                  ref_offset(this->node->raw), this->node->ofs, this->node->ofs+this->node->size));

                        jffs2_mark_node_obsolete(c, this->node->raw);

                        jffs2_free_full_dnode(this->node);

                } else {

                        D2(printk(KERN_DEBUG "Marking old node @0x%08x (0x%04x-0x%04x) REF_NORMAL. frags is %d\n",

                                  ref_offset(this->node->raw), this->node->ofs, this->node->ofs+this->node->size,

                                  this->node->frags));

                        mark_ref_normal(this->node->raw);

                }

        }

        jffs2_free_node_frag(this);

}

/* Given an inode, probably with existing list of fragments, add the new node

 * to the fragment list.

 */

int jffs2_add_full_dnode_to_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, struct jffs2_full_dnode *fn)

{

        int ret;

        struct jffs2_node_frag *newfrag;

        D1(printk(KERN_DEBUG "jffs2_add_full_dnode_to_inode(ino #%u, f %p, fn %p)\n", f->inocache->ino, f, fn));

        newfrag = jffs2_alloc_node_frag();

        if (unlikely(!newfrag))

                return -ENOMEM;

        D2(printk(KERN_DEBUG "adding node %04x-%04x @0x%08x on flash, newfrag *%p\n",

                  fn->ofs, fn->ofs+fn->size, ref_offset(fn->raw), newfrag));

        if (unlikely(!fn->size)) {

                jffs2_free_node_frag(newfrag);

                return 0;

        }

        newfrag->ofs = fn->ofs;

        newfrag->size = fn->size;

        newfrag->node = fn;

        newfrag->node->frags = 1;

        ret = jffs2_add_frag_to_fragtree(c, &f->fragtree, newfrag);

        if (ret)

                return ret;

        /* If we now share a page with other nodes, mark either previous

           or next node REF_NORMAL, as appropriate.  */

        if (newfrag->ofs & (PAGE_CACHE_SIZE-1)) {

                struct jffs2_node_frag *prev = frag_prev(newfrag);

                mark_ref_normal(fn->raw);

                /* If we don't start at zero there's _always_ a previous */

                if (prev->node)

                        mark_ref_normal(prev->node->raw);

        }

        if ((newfrag->ofs+newfrag->size) & (PAGE_CACHE_SIZE-1)) {

                struct jffs2_node_frag *next = frag_next(newfrag);

                if (next) {

                        mark_ref_normal(fn->raw);

                        if (next->node)

                                mark_ref_normal(next->node->raw);

                }

        }

        D2(jffs2_print_frag_list(f));

        return 0;

}

/* Doesn't set inode->i_size */

static int jffs2_add_frag_to_fragtree(struct jffs2_sb_info *c, struct rb_root *list, struct jffs2_node_frag *newfrag)

{

        struct jffs2_node_frag *this;

        uint32_t lastend;

        /* Skip all the nodes which are completed before this one starts */

        this = jffs2_lookup_node_frag(list, newfrag->node->ofs);

        if (this) {

                D2(printk(KERN_DEBUG "j_a_f_d_t_f: Lookup gave frag 0x%04x-0x%04x; phys 0x%08x (*%p)\n",

                          this->ofs, this->ofs+this->size, this->node?(ref_offset(this->node->raw)):0xffffffff, this));

                lastend = this->ofs + this->size;

        } else {

                D2(printk(KERN_DEBUG "j_a_f_d_t_f: Lookup gave no frag\n"));

                lastend = 0;

        }

        /* See if we ran off the end of the list */

        if (lastend <= newfrag->ofs) {

                /* We did */

                /* Check if 'this' node was on the same page as the new node.

                   If so, both 'this' and the new node get marked REF_NORMAL so

                   the GC can take a look.

                */

                if ((lastend-1) >> PAGE_CACHE_SHIFT == newfrag->ofs >> PAGE_CACHE_SHIFT) {

                        if (this->node)

                                mark_ref_normal(this->node->raw);

                        mark_ref_normal(newfrag->node->raw);

                }

                if (lastend < newfrag->node->ofs) {

                        /* ... and we need to put a hole in before the new node */

                        struct jffs2_node_frag *holefrag = jffs2_alloc_node_frag();

                        if (!holefrag)

                                return -ENOMEM;

                        holefrag->ofs = lastend;

                        holefrag->size = newfrag->node->ofs - lastend;

                        holefrag->node = NULL;

                        if (this) {

                                /* By definition, the 'this' node has no right-hand child,

                                   because there are no frags with offset greater than it.

                                   So that's where we want to put the hole */

                                D2(printk(KERN_DEBUG "Adding hole frag (%p) on right of node at (%p)\n", holefrag, this));

                                rb_link_node(&holefrag->rb, &this->rb, &this->rb.rb_right);

                        } else {

                                D2(printk(KERN_DEBUG "Adding hole frag (%p) at root of tree\n", holefrag));

                                rb_link_node(&holefrag->rb, NULL, &list->rb_node);

                        }

                        rb_insert_color(&holefrag->rb, list);

                        this = holefrag;

                }

                if (this) {

                        /* By definition, the 'this' node has no right-hand child,

                           because there are no frags with offset greater than it.

                           So that's where we want to put the hole */

                        D2(printk(KERN_DEBUG "Adding new frag (%p) on right of node at (%p)\n", newfrag, this));

                        rb_link_node(&newfrag->rb, &this->rb, &this->rb.rb_right);

                } else {

                        D2(printk(KERN_DEBUG "Adding new frag (%p) at root of tree\n", newfrag));

                        rb_link_node(&newfrag->rb, NULL, &list->rb_node);

                }

                rb_insert_color(&newfrag->rb, list);

                return 0;

        }

        D2(printk(KERN_DEBUG "j_a_f_d_t_f: dealing with frag 0x%04x-0x%04x; phys 0x%08x (*%p)\n",

                  this->ofs, this->ofs+this->size, this->node?(ref_offset(this->node->raw)):0xffffffff, this));

        /* OK. 'this' is pointing at the first frag that newfrag->ofs at least partially obsoletes,

         * - i.e. newfrag->ofs < this->ofs+this->size && newfrag->ofs >= this->ofs

         */

        if (newfrag->ofs > this->ofs) {

                /* This node isn't completely obsoleted. The start of it remains valid */

                /* Mark the new node and the partially covered node REF_NORMAL -- let

                   the GC take a look at them */

                mark_ref_normal(newfrag->node->raw);

                if (this->node)

                        mark_ref_normal(this->node->raw);

                if (this->ofs + this->size > newfrag->ofs + newfrag->size) {

                        /* The new node splits 'this' frag into two */

                        struct jffs2_node_frag *newfrag2 = jffs2_alloc_node_frag();

                        if (!newfrag2) {

                                jffs2_free_node_frag(newfrag);

                                return -ENOMEM;

                        }

                        D2(printk(KERN_DEBUG "split old frag 0x%04x-0x%04x -->", this->ofs, this->ofs+this->size);

                        if (this->node)

                                printk("phys 0x%08x\n", ref_offset(this->node->raw));

                        else

                                printk("hole\n");

                           )

                        /* New second frag pointing to this's node */

                        newfrag2->ofs = newfrag->ofs + newfrag->size;

                        newfrag2->size = (this->ofs+this->size) - newfrag2->ofs;

                        newfrag2->node = this->node;

                        if (this->node)

                                this->node->frags++;

                        /* Adjust size of original 'this' */

                        this->size = newfrag->ofs - this->ofs;

                        /* Now, we know there's no node with offset

                           greater than this->ofs but smaller than

                           newfrag2->ofs or newfrag->ofs, for obvious

                           reasons. So we can do a tree insert from

                           'this' to insert newfrag, and a tree insert

                           from newfrag to insert newfrag2. */

                        jffs2_fragtree_insert(newfrag, this);

                        rb_insert_color(&newfrag->rb, list);

                        jffs2_fragtree_insert(newfrag2, newfrag);

                        rb_insert_color(&newfrag2->rb, list);

                        return 0;

                }

                /* New node just reduces 'this' frag in size, doesn't split it */

                this->size = newfrag->ofs - this->ofs;

                /* Again, we know it lives down here in the tree */

                jffs2_fragtree_insert(newfrag, this);

                rb_insert_color(&newfrag->rb, list);

        } else {

                /* New frag starts at the same point as 'this' used to. Replace

                   it in the tree without doing a delete and insertion */

                D2(printk(KERN_DEBUG "Inserting newfrag (*%p),%d-%d in before 'this' (*%p),%d-%d\n",

                          newfrag, newfrag->ofs, newfrag->ofs+newfrag->size,

                          this, this->ofs, this->ofs+this->size));

                rb_replace_node(&this->rb, &newfrag->rb, list);

                if (newfrag->ofs + newfrag->size >= this->ofs+this->size) {

                        D2(printk(KERN_DEBUG "Obsoleting node frag %p (%x-%x)\n", this, this->ofs, this->ofs+this->size));

                        jffs2_obsolete_node_frag(c, this);

                } else {

                        this->ofs += newfrag->size;

                        this->size -= newfrag->size;

                        jffs2_fragtree_insert(this, newfrag);

                        rb_insert_color(&this->rb, list);

                        return 0;

                }

        }

        /* OK, now we have newfrag added in the correct place in the tree, but

           frag_next(newfrag) may be a fragment which is overlapped by it

        */

        while ((this = frag_next(newfrag)) && newfrag->ofs + newfrag->size >= this->ofs + this->size) {

                /* 'this' frag is obsoleted completely. */

                D2(printk(KERN_DEBUG "Obsoleting node frag %p (%x-%x) and removing from tree\n", this, this->ofs, this->ofs+this->size));

                rb_erase(&this->rb, list);

                jffs2_obsolete_node_frag(c, this);

        }

        /* Now we're pointing at the first frag which isn't totally obsoleted by

           the new frag */

        if (!this || newfrag->ofs + newfrag->size == this->ofs) {

                return 0;

        }

        /* Still some overlap but we don't need to move it in the tree */

        this->size = (this->ofs + this->size) - (newfrag->ofs + newfrag->size);

        this->ofs = newfrag->ofs + newfrag->size;

        /* And mark them REF_NORMAL so the GC takes a look at them */

        if (this->node)

                mark_ref_normal(this->node->raw);

        mark_ref_normal(newfrag->node->raw);

        return 0;

}

void jffs2_truncate_fraglist (struct jffs2_sb_info *c, struct rb_root *list, uint32_t size)

{

        struct jffs2_node_frag *frag = jffs2_lookup_node_frag(list, size);

        D1(printk(KERN_DEBUG "Truncating fraglist 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) {

                        D1(printk(KERN_DEBUG "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);

                D1(printk(KERN_DEBUG "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;

        }

}

/* Scan the list of all nodes present for this ino, build map of versions, etc. */

static int jffs2_do_read_inode_internal(struct jffs2_sb_info *c,

                                        struct jffs2_inode_info *f,

                                        struct jffs2_raw_inode *latest_node);

int jffs2_do_read_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f,

                        uint32_t ino, struct jffs2_raw_inode *latest_node)

{

        D2(printk(KERN_DEBUG "jffs2_do_read_inode(): getting inocache\n"));

 retry_inocache:

        spin_lock(&c->inocache_lock);

        f->inocache = jffs2_get_ino_cache(c, ino);

        D2(printk(KERN_DEBUG "jffs2_do_read_inode(): Got inocache at %p\n", f->inocache));

        if (f->inocache) {

                /* Check its state. We may need to wait before we can use it */

                switch(f->inocache->state) {

                case INO_STATE_UNCHECKED:

                case INO_STATE_CHECKEDABSENT:

                        f->inocache->state = INO_STATE_READING;

                        break;

                case INO_STATE_CHECKING:

                case INO_STATE_GC:

                        /* If it's in either of these states, we need

                           to wait for whoever's got it to finish and

                           put it back. */

                        D1(printk(KERN_DEBUG "jffs2_get_ino_cache_read waiting for ino #%u in state %d\n",

                                  ino, f->inocache->state));

                        sleep_on_spinunlock(&c->inocache_wq, &c->inocache_lock);

                        goto retry_inocache;

                case INO_STATE_READING:

                case INO_STATE_PRESENT:

                        /* Eep. This should never happen. It can

                        happen if Linux calls read_inode() again

                        before clear_inode() has finished though. */

                        printk(KERN_WARNING "Eep. Trying to read_inode #%u when it's already in state %d!\n", ino, f->inocache->state);

                        /* Fail. That's probably better than allowing it to succeed */

                        f->inocache = NULL;

                        break;

                default:

                        BUG();

                }

        }

        spin_unlock(&c->inocache_lock);

        if (!f->inocache && ino == 1) {

                /* Special case - no root inode on medium */

                f->inocache = jffs2_alloc_inode_cache();

                if (!f->inocache) {

                        printk(KERN_CRIT "jffs2_do_read_inode(): Cannot allocate inocache for root inode\n");

                        return -ENOMEM;

                }

                D1(printk(KERN_DEBUG "jffs2_do_read_inode(): Creating inocache for root inode\n"));

                memset(f->inocache, 0, sizeof(struct jffs2_inode_cache));

                f->inocache->ino = f->inocache->nlink = 1;

                f->inocache->nodes = (struct jffs2_raw_node_ref *)f->inocache;

                f->inocache->state = INO_STATE_READING;

                jffs2_add_ino_cache(c, f->inocache);

        }

        if (!f->inocache) {

                printk(KERN_WARNING "jffs2_do_read_inode() on nonexistent ino %u\n", ino);

                return -ENOENT;

        }

        return jffs2_do_read_inode_internal(c, f, latest_node);

}

int jffs2_do_crccheck_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic)

{

        struct jffs2_raw_inode n;

        struct jffs2_inode_info *f = kmalloc(sizeof(*f), GFP_KERNEL);

        if (!f)

                return -ENOMEM;

        memset(f, 0, sizeof(*f));

        init_MUTEX_LOCKED(&f->sem);

        f->inocache = ic;

        return jffs2_do_read_inode_internal(c, f, &n);

}

static int jffs2_do_read_inode_internal(struct jffs2_sb_info *c,

                                        struct jffs2_inode_info *f,

                                        struct jffs2_raw_inode *latest_node)

{

        struct jffs2_tmp_dnode_info *tn_list, *tn;

        struct jffs2_full_dirent *fd_list;

        struct jffs2_full_dnode *fn = NULL;

        uint32_t crc;

        uint32_t latest_mctime, mctime_ver;

        uint32_t mdata_ver = 0;

        size_t retlen;

        int ret;

        D1(printk(KERN_DEBUG "jffs2_do_read_inode_internal(): ino #%u nlink is %d\n", f->inocache->ino, f->inocache->nlink));

        /* Grab all nodes relevant to this ino */

        ret = jffs2_get_inode_nodes(c, f->inocache->ino, f, &tn_list, &fd_list, &f->highest_version, &latest_mctime, &mctime_ver);

        if (ret) {

                printk(KERN_CRIT "jffs2_get_inode_nodes() for ino %u returned %d\n", f->inocache->ino, ret);

                if (f->inocache->state == INO_STATE_READING)

                        jffs2_set_inocache_state(c, f->inocache, INO_STATE_CHECKEDABSENT);

                return ret;

        }

        f->dents = fd_list;

        while (tn_list) {

                tn = tn_list;

                fn = tn->fn;

                if (f->metadata && tn->version > mdata_ver) {

                        D1(printk(KERN_DEBUG "Obsoleting old metadata at 0x%08x\n", ref_offset(f->metadata->raw)));

                        jffs2_mark_node_obsolete(c, f->metadata->raw);

                        jffs2_free_full_dnode(f->metadata);

                        f->metadata = NULL;

                        mdata_ver = 0;

                }

                if (fn->size) {

                        jffs2_add_full_dnode_to_inode(c, f, fn);

                } else {

                        /* Zero-sized node at end of version list. Just a metadata update */

                        D1(printk(KERN_DEBUG "metadata @%08x: ver %d\n", ref_offset(fn->raw), tn->version));

                        f->metadata = fn;

                        mdata_ver = tn->version;

                }

                tn_list = tn->next;

                jffs2_free_tmp_dnode_info(tn);

        }

        if (!fn) {

                /* No data nodes for this inode. */

                if (f->inocache->ino != 1) {

                        printk(KERN_WARNING "jffs2_do_read_inode(): No data nodes found for ino #%u\n", f->inocache->ino);

                        if (!fd_list) {

                                if (f->inocache->state == INO_STATE_READING)

                                        jffs2_set_inocache_state(c, f->inocache, INO_STATE_CHECKEDABSENT);

                                return -EIO;

                        }

                        printk(KERN_WARNING "jffs2_do_read_inode(): But it has children so we fake some modes for it\n");

                }

                latest_node->mode = cpu_to_jemode(S_IFDIR|S_IRUGO|S_IWUSR|S_IXUGO);

                latest_node->version = cpu_to_je32(0);

                latest_node->atime = latest_node->ctime = latest_node->mtime = cpu_to_je32(0);

                latest_node->isize = cpu_to_je32(0);

                latest_node->gid = cpu_to_je16(0);

                latest_node->uid = cpu_to_je16(0);

                if (f->inocache->state == INO_STATE_READING)

                        jffs2_set_inocache_state(c, f->inocache, INO_STATE_PRESENT);

                return 0;

        }

        ret = jffs2_flash_read(c, ref_offset(fn->raw), sizeof(*latest_node), &retlen, (void *)latest_node);

        if (ret || retlen != sizeof(*latest_node)) {

                printk(KERN_NOTICE "MTD read in jffs2_do_read_inode() failed: Returned %d, %zd of %zd bytes read\n",

                       ret, retlen, sizeof(*latest_node));

                /* FIXME: If this fails, there seems to be a memory leak. Find it. */

                up(&f->sem);

                jffs2_do_clear_inode(c, f);

                return ret?ret:-EIO;

        }

        crc = crc32(0, latest_node, sizeof(*latest_node)-8);

        if (crc != je32_to_cpu(latest_node->node_crc)) {

                printk(KERN_NOTICE "CRC failed for read_inode of inode %u at physical location 0x%x\n", f->inocache->ino, ref_offset(fn->raw));

                up(&f->sem);

                jffs2_do_clear_inode(c, f);

                return -EIO;

        }

        switch(jemode_to_cpu(latest_node->mode) & S_IFMT) {

        case S_IFDIR:

                if (mctime_ver > je32_to_cpu(latest_node->version)) {

                        /* The times in the latest_node are actually older than

                           mctime in the latest dirent. Cheat. */

                        latest_node->ctime = latest_node->mtime = cpu_to_je32(latest_mctime);

                }

                break;

        case S_IFREG:

                /* If it was a regular file, truncate it to the latest node's isize */

                jffs2_truncate_fraglist(c, &f->fragtree, je32_to_cpu(latest_node->isize));

                break;

        case S_IFLNK:

                /* Hack to work around broken isize in old symlink code.

                   Remove this when dwmw2 comes to his senses and stops

                   symlinks from being an entirely gratuitous special

                   case. */

                if (!je32_to_cpu(latest_node->isize))

                        latest_node->isize = latest_node->dsize;

                /* fall through... */

        case S_IFBLK:

        case S_IFCHR:

                /* Certain inode types should have only one data node, and it's

                   kept as the metadata node */

                if (f->metadata) {

                        printk(KERN_WARNING "Argh. Special inode #%u with mode 0%o had metadata node\n",

                               f->inocache->ino, jemode_to_cpu(latest_node->mode));

                        up(&f->sem);

                        jffs2_do_clear_inode(c, f);

                        return -EIO;

                }

                if (!frag_first(&f->fragtree)) {

                        printk(KERN_WARNING "Argh. Special inode #%u with mode 0%o has no fragments\n",

                               f->inocache->ino, jemode_to_cpu(latest_node->mode));

                        up(&f->sem);

                        jffs2_do_clear_inode(c, f);

                        return -EIO;

                }

                /* ASSERT: f->fraglist != NULL */

                if (frag_next(frag_first(&f->fragtree))) {

                        printk(KERN_WARNING "Argh. Special inode #%u with mode 0x%x had more than one node\n",

                               f->inocache->ino, jemode_to_cpu(latest_node->mode));

                        /* FIXME: Deal with it - check crc32, check for duplicate node, check times and discard the older one */

                        up(&f->sem);

                        jffs2_do_clear_inode(c, f);

                        return -EIO;

                }

                /* OK. We're happy */

                f->metadata = frag_first(&f->fragtree)->node;

                jffs2_free_node_frag(frag_first(&f->fragtree));

                f->fragtree = RB_ROOT;

                break;

        }

        if (f->inocache->state == INO_STATE_READING)

                jffs2_set_inocache_state(c, f->inocache, INO_STATE_PRESENT);

        return 0;

}

void jffs2_do_clear_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f)

{

        struct jffs2_full_dirent *fd, *fds;

        /* I don't think we care about the potential race due to reading this

           without f->sem. It can never get undeleted. */

        int deleted = f->inocache && !f->inocache->nlink;

        /* If it's a deleted inode, grab the alloc_sem. This prevents

           jffs2_garbage_collect_pass() from deciding that it wants to

           garbage collect one of the nodes we're just about to mark

           obsolete -- by the time we drop alloc_sem and return, all

           the nodes are marked obsolete, and jffs2_g_c_pass() won't

           call iget() for the inode in question.

           We also used to do this to keep the temporary BUG() in

           jffs2_mark_node_obsolete() from triggering.

        */

        if(deleted)

                down(&c->alloc_sem);

        down(&f->sem);

        if (f->metadata) {

                if (deleted)

                        jffs2_mark_node_obsolete(c, f->metadata->raw);

                jffs2_free_full_dnode(f->metadata);

        }

        jffs2_kill_fragtree(&f->fragtree, deleted?c:NULL);

        fds = f->dents;

        while(fds) {

                fd = fds;

                fds = fd->next;

                jffs2_free_full_dirent(fd);

        }

        if (f->inocache && f->inocache->state != INO_STATE_CHECKING)

                jffs2_set_inocache_state(c, f->inocache, INO_STATE_CHECKEDABSENT);

        up(&f->sem);

        if(deleted)

                up(&c->alloc_sem);

}