1 files changed, 3457 insertions, 0 deletions

diff --git a/fs/jffs/intrep.c b/fs/jffs/intrep.c
new file mode 100644
index 000000000000..8cc6893fc56c
--- /dev/null
+++ b/fs/jffs/intrep.c
@@ -0,0 +1,3457 @@
+/*
+ * JFFS -- Journaling Flash File System, Linux implementation.
+ *
+ * Copyright (C) 1999, 2000  Axis Communications, Inc.
+ *
+ * Created by Finn Hakansson <finn@axis.com>.
+ *
+ * This is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * $Id: intrep.c,v 1.102 2001/09/23 23:28:36 dwmw2 Exp $
+ *
+ * Ported to Linux 2.3.x and MTD:
+ * Copyright (C) 2000  Alexander Larsson (alex@cendio.se), Cendio Systems AB
+ *
+ */
+
+/* This file contains the code for the internal structure of the
+   Journaling Flash File System, JFFS.  */
+
+/*
+ * Todo list:
+ *
+ * memcpy_to_flash() and memcpy_from_flash() functions.
+ *
+ * Implementation of hard links.
+ *
+ * Organize the source code in a better way. Against the VFS we could
+ * have jffs_ext.c, and against the block device jffs_int.c.
+ * A better file-internal organization too.
+ *
+ * A better checksum algorithm.
+ *
+ * Consider endianness stuff. ntohl() etc.
+ *
+ * Are we handling the atime, mtime, ctime members of the inode right?
+ *
+ * Remove some duplicated code. Take a look at jffs_write_node() and
+ * jffs_rewrite_data() for instance.
+ *
+ * Implement more meaning of the nlink member in various data structures.
+ * nlink could be used in conjunction with hard links for instance.
+ *
+ * Better memory management. Allocate data structures in larger chunks
+ * if possible.
+ *
+ * If too much meta data is stored, a garbage collect should be issued.
+ * We have experienced problems with too much meta data with for instance
+ * log files.
+ *
+ * Improve the calls to jffs_ioctl(). We would like to retrieve more
+ * information to be able to debug (or to supervise) JFFS during run-time.
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/jffs.h>
+#include <linux/fs.h>
+#include <linux/stat.h>
+#include <linux/pagemap.h>
+#include <asm/semaphore.h>
+#include <asm/byteorder.h>
+#include <linux/smp_lock.h>
+#include <linux/time.h>
+#include <linux/ctype.h>
+
+#include "intrep.h"
+#include "jffs_fm.h"
+
+long no_jffs_node = 0;
+static long no_jffs_file = 0;
+#if defined(JFFS_MEMORY_DEBUG) && JFFS_MEMORY_DEBUG
+long no_jffs_control = 0;
+long no_jffs_raw_inode = 0;
+long no_jffs_node_ref = 0;
+long no_jffs_fm = 0;
+long no_jffs_fmcontrol = 0;
+long no_hash = 0;
+long no_name = 0;
+#endif
+
+static int jffs_scan_flash(struct jffs_control *c);
+static int jffs_update_file(struct jffs_file *f, struct jffs_node *node);
+static int jffs_build_file(struct jffs_file *f);
+static int jffs_free_file(struct jffs_file *f);
+static int jffs_free_node_list(struct jffs_file *f);
+static int jffs_garbage_collect_now(struct jffs_control *c);
+static int jffs_insert_file_into_hash(struct jffs_file *f);
+static int jffs_remove_redundant_nodes(struct jffs_file *f);
+
+/* Is there enough space on the flash?  */
+static inline int JFFS_ENOUGH_SPACE(struct jffs_control *c, __u32 space)
+{
+        struct jffs_fmcontrol *fmc = c->fmc;
+
+        while (1) {
+                if ((fmc->flash_size - (fmc->used_size + fmc->dirty_size))
+                        >= fmc->min_free_size + space) {
+                        return 1;
+                }
+                if (fmc->dirty_size < fmc->sector_size)
+                        return 0;
+
+                if (jffs_garbage_collect_now(c)) {
+                  D1(printk("JFFS_ENOUGH_SPACE: jffs_garbage_collect_now() failed.\n"));
+                  return 0;
+                }
+        }
+}
+
+#if CONFIG_JFFS_FS_VERBOSE > 0
+static __u8
+flash_read_u8(struct mtd_info *mtd, loff_t from)
+{
+        size_t retlen;
+        __u8 ret;
+        int res;
+
+        res = MTD_READ(mtd, from, 1, &retlen, &ret);
+        if (retlen != 1) {
+                printk("Didn't read a byte in flash_read_u8(). Returned %d\n", res);
+                return 0;
+        }
+
+        return ret;
+}
+
+static void
+jffs_hexdump(struct mtd_info *mtd, loff_t pos, int size)
+{
+        char line[16];
+        int j = 0;
+
+        while (size > 0) {
+                int i;
+
+                printk("%ld:", (long) pos);
+                for (j = 0; j < 16; j++) {
+                        line[j] = flash_read_u8(mtd, pos++);
+                }
+                for (i = 0; i < j; i++) {
+                        if (!(i & 1)) {
+                                printk(" %.2x", line[i] & 0xff);
+                        }
+                        else {
+                                printk("%.2x", line[i] & 0xff);
+                        }
+                }
+
+                /* Print empty space */
+                for (; i < 16; i++) {
+                        if (!(i & 1)) {
+                                printk("   ");
+                        }
+                        else {
+                                printk("  ");
+                        }
+                }
+                printk("  ");
+
+                for (i = 0; i < j; i++) {
+                        if (isgraph(line[i])) {
+                                printk("%c", line[i]);
+                        }
+                        else {
+                                printk(".");
+                        }
+                }
+                printk("\n");
+                size -= 16;
+        }
+}
+
+#endif
+
+#define flash_safe_acquire(arg)
+#define flash_safe_release(arg)
+
+
+static int
+flash_safe_read(struct mtd_info *mtd, loff_t from,
+                u_char *buf, size_t count)
+{
+        size_t retlen;
+        int res;
+
+        D3(printk(KERN_NOTICE "flash_safe_read(%p, %08x, %p, %08x)\n",
+                  mtd, (unsigned int) from, buf, count));
+
+        res = MTD_READ(mtd, from, count, &retlen, buf);
+        if (retlen != count) {
+                panic("Didn't read all bytes in flash_safe_read(). Returned %d\n", res);
+        }
+        return res?res:retlen;
+}
+
+
+static __u32
+flash_read_u32(struct mtd_info *mtd, loff_t from)
+{
+        size_t retlen;
+        __u32 ret;
+        int res;
+
+        res = MTD_READ(mtd, from, 4, &retlen, (unsigned char *)&ret);
+        if (retlen != 4) {
+                printk("Didn't read all bytes in flash_read_u32(). Returned %d\n", res);
+                return 0;
+        }
+
+        return ret;
+}
+
+
+static int
+flash_safe_write(struct mtd_info *mtd, loff_t to,
+                 const u_char *buf, size_t count)
+{
+        size_t retlen;
+        int res;
+
+        D3(printk(KERN_NOTICE "flash_safe_write(%p, %08x, %p, %08x)\n",
+                  mtd, (unsigned int) to, buf, count));
+
+        res = MTD_WRITE(mtd, to, count, &retlen, buf);
+        if (retlen != count) {
+                printk("Didn't write all bytes in flash_safe_write(). Returned %d\n", res);
+        }
+        return res?res:retlen;
+}
+
+
+static int
+flash_safe_writev(struct mtd_info *mtd, const struct kvec *vecs,
+                        unsigned long iovec_cnt, loff_t to)
+{
+        size_t retlen, retlen_a;
+        int i;
+        int res;
+
+        D3(printk(KERN_NOTICE "flash_safe_writev(%p, %08x, %p)\n",
+                  mtd, (unsigned int) to, vecs));
+        
+        if (mtd->writev) {
+                res = MTD_WRITEV(mtd, vecs, iovec_cnt, to, &retlen);
+                return res ? res : retlen;
+        }
+        /* Not implemented writev. Repeatedly use write - on the not so
+           unreasonable assumption that the mtd driver doesn't care how
+           many write cycles we use. */
+        res=0;
+        retlen=0;
+
+        for (i=0; !res && i<iovec_cnt; i++) {
+                res = MTD_WRITE(mtd, to, vecs[i].iov_len, &retlen_a, vecs[i].iov_base);
+                if (retlen_a != vecs[i].iov_len) {
+                        printk("Didn't write all bytes in flash_safe_writev(). Returned %d\n", res);
+                        if (i != iovec_cnt-1)
+                                return -EIO;
+                }
+                /* If res is non-zero, retlen_a is undefined, but we don't
+                   care because in that case it's not going to be 
+                   returned anyway.
+                */
+                to += retlen_a;
+                retlen += retlen_a;
+        }
+        return res?res:retlen;
+}
+
+
+static int
+flash_memset(struct mtd_info *mtd, loff_t to,
+             const u_char c, size_t size)
+{
+        static unsigned char pattern[64];
+        int i;
+
+        /* fill up pattern */
+
+        for(i = 0; i < 64; i++)
+                pattern[i] = c;
+
+        /* write as many 64-byte chunks as we can */
+
+        while (size >= 64) {
+                flash_safe_write(mtd, to, pattern, 64);
+                size -= 64;
+                to += 64;
+        }
+
+        /* and the rest */
+
+        if(size)
+                flash_safe_write(mtd, to, pattern, size);
+
+        return size;
+}
+
+
+static void
+intrep_erase_callback(struct erase_info *done)
+{
+        wait_queue_head_t *wait_q;
+
+        wait_q = (wait_queue_head_t *)done->priv;
+
+        wake_up(wait_q);
+}
+
+
+static int
+flash_erase_region(struct mtd_info *mtd, loff_t start,
+                   size_t size)
+{
+        struct erase_info *erase;
+        DECLARE_WAITQUEUE(wait, current);
+        wait_queue_head_t wait_q;
+
+        erase = kmalloc(sizeof(struct erase_info), GFP_KERNEL);
+        if (!erase)
+                return -ENOMEM;
+
+        init_waitqueue_head(&wait_q);
+
+        erase->mtd = mtd;
+        erase->callback = intrep_erase_callback;
+        erase->addr = start;
+        erase->len = size;
+        erase->priv = (u_long)&wait_q;
+
+        /* FIXME: Use TASK_INTERRUPTIBLE and deal with being interrupted */
+        set_current_state(TASK_UNINTERRUPTIBLE);
+        add_wait_queue(&wait_q, &wait);
+
+        if (MTD_ERASE(mtd, erase) < 0) {
+                set_current_state(TASK_RUNNING);
+                remove_wait_queue(&wait_q, &wait);
+                kfree(erase);
+
+                printk(KERN_WARNING "flash: erase of region [0x%lx, 0x%lx] "
+                       "totally failed\n", (long)start, (long)start + size);
+
+                return -1;
+        }
+
+        schedule(); /* Wait for flash to finish. */
+        remove_wait_queue(&wait_q, &wait);
+
+        kfree(erase);
+
+        return 0;
+}
+
+/* This routine calculates checksums in JFFS.  */
+static __u32
+jffs_checksum(const void *data, int size)
+{
+        __u32 sum = 0;
+        __u8 *ptr = (__u8 *)data;
+        while (size-- > 0) {
+                sum += *ptr++;
+        }
+        D3(printk(", result: 0x%08x\n", sum));
+        return sum;
+}
+
+
+static int
+jffs_checksum_flash(struct mtd_info *mtd, loff_t start, int size, __u32 *result)
+{
+        __u32 sum = 0;
+        loff_t ptr = start;
+        __u8 *read_buf;
+        int i, length;
+
+        /* Allocate read buffer */
+        read_buf = (__u8 *) kmalloc (sizeof(__u8) * 4096, GFP_KERNEL);
+        if (!read_buf) {
+                printk(KERN_NOTICE "kmalloc failed in jffs_checksum_flash()\n");
+                return -ENOMEM;
+        }
+        /* Loop until checksum done */
+        while (size) {
+                /* Get amount of data to read */
+                if (size < 4096)
+                        length = size;
+                else
+                        length = 4096;
+
+                /* Perform flash read */
+                D3(printk(KERN_NOTICE "jffs_checksum_flash\n"));
+                flash_safe_read(mtd, ptr, &read_buf[0], length);
+
+                /* Compute checksum */
+                for (i=0; i < length ; i++)
+                        sum += read_buf[i];
+
+                /* Update pointer and size */
+                size -= length;
+                ptr += length;
+        }
+
+        /* Free read buffer */
+        kfree (read_buf);
+
+        /* Return result */
+        D3(printk("checksum result: 0x%08x\n", sum));
+        *result = sum;
+        return 0;
+}
+
+static __inline__ void jffs_fm_write_lock(struct jffs_fmcontrol *fmc)
+{
+  //    down(&fmc->wlock);
+}
+
+static __inline__ void jffs_fm_write_unlock(struct jffs_fmcontrol *fmc)
+{
+  //    up(&fmc->wlock);
+}
+
+
+/* Create and initialize a new struct jffs_file.  */
+static struct jffs_file *
+jffs_create_file(struct jffs_control *c,
+                 const struct jffs_raw_inode *raw_inode)
+{
+        struct jffs_file *f;
+
+        if (!(f = (struct jffs_file *)kmalloc(sizeof(struct jffs_file),
+                                              GFP_KERNEL))) {
+                D(printk("jffs_create_file(): Failed!\n"));
+                return NULL;
+        }
+        no_jffs_file++;
+        memset(f, 0, sizeof(struct jffs_file));
+        f->ino = raw_inode->ino;
+        f->pino = raw_inode->pino;
+        f->nlink = raw_inode->nlink;
+        f->deleted = raw_inode->deleted;
+        f->c = c;
+
+        return f;
+}
+
+
+/* Build a control block for the file system.  */
+static struct jffs_control *
+jffs_create_control(struct super_block *sb)
+{
+        struct jffs_control *c;
+        register int s = sizeof(struct jffs_control);
+        int i;
+        D(char *t = 0);
+
+        D2(printk("jffs_create_control()\n"));
+
+        if (!(c = (struct jffs_control *)kmalloc(s, GFP_KERNEL))) {
+                goto fail_control;
+        }
+        DJM(no_jffs_control++);
+        c->root = NULL;
+        c->gc_task = NULL;
+        c->hash_len = JFFS_HASH_SIZE;
+        s = sizeof(struct list_head) * c->hash_len;
+        if (!(c->hash = (struct list_head *)kmalloc(s, GFP_KERNEL))) {
+                goto fail_hash;
+        }
+        DJM(no_hash++);
+        for (i = 0; i < c->hash_len; i++)
+                INIT_LIST_HEAD(&c->hash[i]);
+        if (!(c->fmc = jffs_build_begin(c, MINOR(sb->s_dev)))) {
+                goto fail_fminit;
+        }
+        c->next_ino = JFFS_MIN_INO + 1;
+        c->delete_list = (struct jffs_delete_list *) 0;
+        return c;
+
+fail_fminit:
+        D(t = "c->fmc");
+fail_hash:
+        kfree(c);
+        DJM(no_jffs_control--);
+        D(t = t ? t : "c->hash");
+fail_control:
+        D(t = t ? t : "control");
+        D(printk("jffs_create_control(): Allocation failed: (%s)\n", t));
+        return (struct jffs_control *)0;
+}
+
+
+/* Clean up all data structures associated with the file system.  */
+void
+jffs_cleanup_control(struct jffs_control *c)
+{
+        D2(printk("jffs_cleanup_control()\n"));
+
+        if (!c) {
+                D(printk("jffs_cleanup_control(): c == NULL !!!\n"));
+                return;
+        }
+
+        while (c->delete_list) {
+                struct jffs_delete_list *delete_list_element;
+                delete_list_element = c->delete_list;
+                c->delete_list = c->delete_list->next;
+                kfree(delete_list_element);
+        }
+
+        /* Free all files and nodes.  */
+        if (c->hash) {
+                jffs_foreach_file(c, jffs_free_node_list);
+                jffs_foreach_file(c, jffs_free_file);
+                kfree(c->hash);
+                DJM(no_hash--);
+        }
+        jffs_cleanup_fmcontrol(c->fmc);
+        kfree(c);
+        DJM(no_jffs_control--);
+        D3(printk("jffs_cleanup_control(): Leaving...\n"));
+}
+
+
+/* This function adds a virtual root node to the in-RAM representation.
+   Called by jffs_build_fs().  */
+static int
+jffs_add_virtual_root(struct jffs_control *c)
+{
+        struct jffs_file *root;
+        struct jffs_node *node;
+
+        D2(printk("jffs_add_virtual_root(): "
+                  "Creating a virtual root directory.\n"));
+
+        if (!(root = (struct jffs_file *)kmalloc(sizeof(struct jffs_file),
+                                                 GFP_KERNEL))) {
+                return -ENOMEM;
+        }
+        no_jffs_file++;
+        if (!(node = jffs_alloc_node())) {
+                kfree(root);
+                no_jffs_file--;
+                return -ENOMEM;
+        }
+        DJM(no_jffs_node++);
+        memset(node, 0, sizeof(struct jffs_node));
+        node->ino = JFFS_MIN_INO;
+        memset(root, 0, sizeof(struct jffs_file));
+        root->ino = JFFS_MIN_INO;
+        root->mode = S_IFDIR | S_IRWXU | S_IRGRP
+                     | S_IXGRP | S_IROTH | S_IXOTH;
+        root->atime = root->mtime = root->ctime = get_seconds();
+        root->nlink = 1;
+        root->c = c;
+        root->version_head = root->version_tail = node;
+        jffs_insert_file_into_hash(root);
+        return 0;
+}
+
+
+/* This is where the file system is built and initialized.  */
+int
+jffs_build_fs(struct super_block *sb)
+{
+        struct jffs_control *c;
+        int err = 0;
+
+        D2(printk("jffs_build_fs()\n"));
+
+        if (!(c = jffs_create_control(sb))) {
+                return -ENOMEM;
+        }
+        c->building_fs = 1;
+        c->sb = sb;
+        if ((err = jffs_scan_flash(c)) < 0) {
+                if(err == -EAGAIN){
+                        /* scan_flash() wants us to try once more. A flipping 
+                           bits sector was detect in the middle of the scan flash.
+                           Clean up old allocated memory before going in.
+                        */
+                        D1(printk("jffs_build_fs: Cleaning up all control structures,"
+                                  " reallocating them and trying mount again.\n"));
+                        jffs_cleanup_control(c);
+                        if (!(c = jffs_create_control(sb))) {
+                                return -ENOMEM;
+                        }
+                        c->building_fs = 1;
+                        c->sb = sb;
+
+                        if ((err = jffs_scan_flash(c)) < 0) {
+                                goto jffs_build_fs_fail;
+                        }                       
+                }else{
+                        goto jffs_build_fs_fail;
+                }
+        }
+
+        /* Add a virtual root node if no one exists.  */
+        if (!jffs_find_file(c, JFFS_MIN_INO)) {
+                if ((err = jffs_add_virtual_root(c)) < 0) {
+                        goto jffs_build_fs_fail;
+                }
+        }
+
+        while (c->delete_list) {
+                struct jffs_file *f;
+                struct jffs_delete_list *delete_list_element;
+
+                if ((f = jffs_find_file(c, c->delete_list->ino))) {
+                        f->deleted = 1;
+                }
+                delete_list_element = c->delete_list;
+                c->delete_list = c->delete_list->next;
+                kfree(delete_list_element);
+        }
+
+        /* Remove deleted nodes.  */
+        if ((err = jffs_foreach_file(c, jffs_possibly_delete_file)) < 0) {
+                printk(KERN_ERR "JFFS: Failed to remove deleted nodes.\n");
+                goto jffs_build_fs_fail;
+        }
+        /* Remove redundant nodes.  (We are not interested in the
+           return value in this case.)  */
+        jffs_foreach_file(c, jffs_remove_redundant_nodes);
+        /* Try to build a tree from all the nodes.  */
+        if ((err = jffs_foreach_file(c, jffs_insert_file_into_tree)) < 0) {
+                printk("JFFS: Failed to build tree.\n");
+                goto jffs_build_fs_fail;
+        }
+        /* Compute the sizes of all files in the filesystem.  Adjust if
+           necessary.  */
+        if ((err = jffs_foreach_file(c, jffs_build_file)) < 0) {
+                printk("JFFS: Failed to build file system.\n");
+                goto jffs_build_fs_fail;
+        }
+        sb->s_fs_info = (void *)c;
+        c->building_fs = 0;
+
+        D1(jffs_print_hash_table(c));
+        D1(jffs_print_tree(c->root, 0));
+
+        return 0;
+
+jffs_build_fs_fail:
+        jffs_cleanup_control(c);
+        return err;
+} /* jffs_build_fs()  */
+
+
+/*
+  This checks for sectors that were being erased in their previous 
+  lifetimes and for some reason or the other (power fail etc.), 
+  the erase cycles never completed.
+  As the flash array would have reverted back to read status, 
+  these sectors are detected by the symptom of the "flipping bits",
+  i.e. bits being read back differently from the same location in
+  flash if read multiple times.
+  The only solution to this is to re-erase the entire
+  sector.
+  Unfortunately detecting "flipping bits" is not a simple exercise
+  as a bit may be read back at 1 or 0 depending on the alignment 
+  of the stars in the universe.
+  The level of confidence is in direct proportion to the number of 
+  scans done. By power fail testing I (Vipin) have been able to 
+  proove that reading twice is not enough.
+  Maybe 4 times? Change NUM_REREADS to a higher number if you want
+  a (even) higher degree of confidence in your mount process. 
+  A higher number would of course slow down your mount.
+*/
+static int check_partly_erased_sectors(struct jffs_fmcontrol *fmc){
+
+#define NUM_REREADS             4 /* see note above */
+#define READ_AHEAD_BYTES        4096 /* must be a multiple of 4, 
+                                        usually set to kernel page size */
+
+        __u8 *read_buf1;
+        __u8 *read_buf2;
+
+        int err = 0;
+        int retlen;
+        int i;
+        int cnt;
+        __u32 offset;
+        loff_t pos = 0;
+        loff_t end = fmc->flash_size;
+
+
+        /* Allocate read buffers */
+        read_buf1 = (__u8 *) kmalloc (sizeof(__u8) * READ_AHEAD_BYTES, GFP_KERNEL);
+        if (!read_buf1)
+                return -ENOMEM;
+
+        read_buf2 = (__u8 *) kmalloc (sizeof(__u8) * READ_AHEAD_BYTES, GFP_KERNEL);
+        if (!read_buf2) {
+                kfree(read_buf1);
+                return -ENOMEM;
+        }
+
+ CHECK_NEXT:
+        while(pos < end){
+                
+                D1(printk("check_partly_erased_sector():checking sector which contains"
+                          " offset 0x%x for flipping bits..\n", (__u32)pos));
+                
+                retlen = flash_safe_read(fmc->mtd, pos,
+                                         &read_buf1[0], READ_AHEAD_BYTES);
+                retlen &= ~3;
+                
+                for(cnt = 0; cnt < NUM_REREADS; cnt++){
+                        (void)flash_safe_read(fmc->mtd, pos,
+                                              &read_buf2[0], READ_AHEAD_BYTES);
+                        
+                        for (i=0 ; i < retlen ; i+=4) {
+                                /* buffers MUST match, double word for word! */
+                                if(*((__u32 *) &read_buf1[i]) !=
+                                   *((__u32 *) &read_buf2[i])
+                                   ){
+                                        /* flipping bits detected, time to erase sector */
+                                        /* This will help us log some statistics etc. */
+                                        D1(printk("Flipping bits detected in re-read round:%i of %i\n",
+                                               cnt, NUM_REREADS));
+                                        D1(printk("check_partly_erased_sectors:flipping bits detected"
+                                                  " @offset:0x%x(0x%x!=0x%x)\n",
+                                                  (__u32)pos+i, *((__u32 *) &read_buf1[i]), 
+                                                  *((__u32 *) &read_buf2[i])));
+                                        
+                                        /* calculate start of present sector */
+                                        offset = (((__u32)pos+i)/(__u32)fmc->sector_size) * (__u32)fmc->sector_size;
+                                        
+                                        D1(printk("check_partly_erased_sector():erasing sector starting 0x%x.\n",
+                                                  offset));
+                                        
+                                        if (flash_erase_region(fmc->mtd,
+                                                               offset, fmc->sector_size) < 0) {
+                                                printk(KERN_ERR "JFFS: Erase of flash failed. "
+                                                       "offset = %u, erase_size = %d\n",
+                                                       offset , fmc->sector_size);
+                                                
+                                                err = -EIO;
+                                                goto returnBack;
+
+                                        }else{
+                                                D1(printk("JFFS: Erase of flash sector @0x%x successful.\n",
+                                                       offset));
+                                                /* skip ahead to the next sector */
+                                                pos = (((__u32)pos+i)/(__u32)fmc->sector_size) * (__u32)fmc->sector_size;
+                                                pos += fmc->sector_size;
+                                                goto CHECK_NEXT;
+                                        }
+                                }
+                        }
+                }
+                pos += READ_AHEAD_BYTES;
+        }
+
+ returnBack:
+        kfree(read_buf1);
+        kfree(read_buf2);
+
+        D2(printk("check_partly_erased_sector():Done checking all sectors till offset 0x%x for flipping bits.\n",
+                  (__u32)pos));
+
+        return err;
+
+}/* end check_partly_erased_sectors() */
+
+
+
+/* Scan the whole flash memory in order to find all nodes in the
+   file systems.  */
+static int
+jffs_scan_flash(struct jffs_control *c)
+{
+        char name[JFFS_MAX_NAME_LEN + 2];
+        struct jffs_raw_inode raw_inode;
+        struct jffs_node *node = NULL;
+        struct jffs_fmcontrol *fmc = c->fmc;
+        __u32 checksum;
+        __u8 tmp_accurate;
+        __u16 tmp_chksum;
+        __u32 deleted_file;
+        loff_t pos = 0;
+        loff_t start;
+        loff_t test_start;
+        loff_t end = fmc->flash_size;
+        __u8 *read_buf;
+        int i, len, retlen;
+        __u32 offset;
+
+        __u32 free_chunk_size1;
+        __u32 free_chunk_size2;
+
+        
+#define NUMFREEALLOWED     2        /* 2 chunks of at least erase size space allowed */
+        int num_free_space = 0;       /* Flag err if more than TWO
+                                       free blocks found. This is NOT allowed
+                                       by the current jffs design.
+                                    */
+        int num_free_spc_not_accp = 0; /* For debugging purposed keep count 
+                                        of how much free space was rejected and
+                                        marked dirty
+                                     */
+
+        D1(printk("jffs_scan_flash(): start pos = 0x%lx, end = 0x%lx\n",
+                  (long)pos, (long)end));
+
+        flash_safe_acquire(fmc->mtd);
+
+        /*
+          check and make sure that any sector does not suffer
+          from the "partly erased, bit flipping syndrome" (TM Vipin :)
+          If so, offending sectors will be erased.
+        */
+        if(check_partly_erased_sectors(fmc) < 0){
+
+                flash_safe_release(fmc->mtd);
+                return -EIO; /* bad, bad, bad error. Cannot continue.*/
+        }
+
+        /* Allocate read buffer */
+        read_buf = (__u8 *) kmalloc (sizeof(__u8) * 4096, GFP_KERNEL);
+        if (!read_buf) {
+                flash_safe_release(fmc->mtd);
+                return -ENOMEM;
+        }
+                              
+        /* Start the scan.  */
+        while (pos < end) {
+                deleted_file = 0;
+
+                /* Remember the position from where we started this scan.  */
+                start = pos;
+
+                switch (flash_read_u32(fmc->mtd, pos)) {
+                case JFFS_EMPTY_BITMASK:
+                        /* We have found 0xffffffff at this position.  We have to
+                           scan the rest of the flash till the end or till
+                           something else than 0xffffffff is found.
+                           Keep going till we do not find JFFS_EMPTY_BITMASK 
+                           anymore */
+
+                        D1(printk("jffs_scan_flash(): 0xffffffff at pos 0x%lx.\n",
+                                  (long)pos));
+
+                        while(pos < end){
+
+                              len = end - pos < 4096 ? end - pos : 4096;
+                              
+                              retlen = flash_safe_read(fmc->mtd, pos,
+                                                 &read_buf[0], len);
+
+                              retlen &= ~3;
+                              
+                              for (i=0 ; i < retlen ; i+=4, pos += 4) {
+                                      if(*((__u32 *) &read_buf[i]) !=
+                                         JFFS_EMPTY_BITMASK)
+                                        break;
+                              }
+                              if (i == retlen)
+                                    continue;
+                              else
+                                    break;
+                        }
+
+                        D1(printk("jffs_scan_flash():0xffffffff ended at pos 0x%lx.\n",
+                                  (long)pos));
+                        
+                        /* If some free space ends in the middle of a sector,
+                           treat it as dirty rather than clean.
+                           This is to handle the case where one thread 
+                           allocated space for a node, but didn't get to
+                           actually _write_ it before power was lost, leaving
+                           a gap in the log. Shifting all node writes into
+                           a single kernel thread will fix the original problem.
+                        */
+                        if ((__u32) pos % fmc->sector_size) {
+                                /* If there was free space in previous 
+                                   sectors, don't mark that dirty too - 
+                                   only from the beginning of this sector
+                                   (or from start) 
+                                */
+
+                                test_start = pos & ~(fmc->sector_size-1); /* end of last sector */
+
+                                if (start < test_start) {
+
+                                        /* free space started in the previous sector! */
+
+                                        if((num_free_space < NUMFREEALLOWED) && 
+                                           ((unsigned int)(test_start - start) >= fmc->sector_size)){
+
+                                                /*
+                                                  Count it in if we are still under NUMFREEALLOWED *and* it is 
+                                                  at least 1 erase sector in length. This will keep us from 
+                                                  picking any little ole' space as "free".
+                                                */
+                                          
+                                                D1(printk("Reducing end of free space to 0x%x from 0x%x\n",
+                                                          (unsigned int)test_start, (unsigned int)pos));
+
+                                                D1(printk("Free space accepted: Starting 0x%x for 0x%x bytes\n",
+                                                          (unsigned int) start,
+                                                          (unsigned int)(test_start - start)));
+
+                                                /* below, space from "start" to "pos" will be marked dirty. */
+                                                start = test_start; 
+                                                
+                                                /* Being in here means that we have found at least an entire 
+                                                   erase sector size of free space ending on a sector boundary.
+                                                   Keep track of free spaces accepted.
+                                                */
+                                                num_free_space++;
+                                        }else{
+                                                num_free_spc_not_accp++;
+                                                D1(printk("Free space (#%i) found but *Not* accepted: Starting"
+                                                          " 0x%x for 0x%x bytes\n",
+                                                          num_free_spc_not_accp, (unsigned int)start, 
+                                                          (unsigned int)((unsigned int)(pos & ~(fmc->sector_size-1)) - (unsigned int)start)));
+                                                
+                                        }
+                                        
+                                }
+                                if((((__u32)(pos - start)) != 0)){
+
+                                        D1(printk("Dirty space: Starting 0x%x for 0x%x bytes\n",
+                                                  (unsigned int) start, (unsigned int) (pos - start)));
+                                        jffs_fmalloced(fmc, (__u32) start,
+                                                       (__u32) (pos - start), NULL);
+                                }else{
+                                        /* "Flipping bits" detected. This means that our scan for them
+                                           did not catch this offset. See check_partly_erased_sectors() for
+                                           more info.
+                                        */
+                                        
+                                        D1(printk("jffs_scan_flash():wants to allocate dirty flash "
+                                                  "space for 0 bytes.\n"));
+                                        D1(printk("jffs_scan_flash(): Flipping bits! We will free "
+                                                  "all allocated memory, erase this sector and remount\n"));
+
+                                        /* calculate start of present sector */
+                                        offset = (((__u32)pos)/(__u32)fmc->sector_size) * (__u32)fmc->sector_size;
+                                        
+                                        D1(printk("jffs_scan_flash():erasing sector starting 0x%x.\n",
+                                                  offset));
+                                        
+                                        if (flash_erase_region(fmc->mtd,
+                                                               offset, fmc->sector_size) < 0) {
+                                                printk(KERN_ERR "JFFS: Erase of flash failed. "
+                                                       "offset = %u, erase_size = %d\n",
+                                                       offset , fmc->sector_size);
+
+                                                flash_safe_release(fmc->mtd);
+                                                kfree (read_buf);
+                                                return -1; /* bad, bad, bad! */
+
+                                        }
+                                        flash_safe_release(fmc->mtd);
+                                        kfree (read_buf);
+
+                                        return -EAGAIN; /* erased offending sector. Try mount one more time please. */
+                                }
+                        }else{
+                                /* Being in here means that we have found free space that ends on an erase sector
+                                   boundary.
+                                   Count it in if we are still under NUMFREEALLOWED *and* it is at least 1 erase 
+                                   sector in length. This will keep us from picking any little ole' space as "free".
+                                 */
+                                 if((num_free_space < NUMFREEALLOWED) && 
+                                    ((unsigned int)(pos - start) >= fmc->sector_size)){
+                                           /* We really don't do anything to mark space as free, except *not* 
+                                              mark it dirty and just advance the "pos" location pointer. 
+                                              It will automatically be picked up as free space.
+                                            */ 
+                                           num_free_space++;
+                                           D1(printk("Free space accepted: Starting 0x%x for 0x%x bytes\n",
+                                                     (unsigned int) start, (unsigned int) (pos - start)));
+                                 }else{
+                                         num_free_spc_not_accp++;
+                                         D1(printk("Free space (#%i) found but *Not* accepted: Starting "
+                                                   "0x%x for 0x%x bytes\n", num_free_spc_not_accp, 
+                                                   (unsigned int) start, 
+                                                   (unsigned int) (pos - start)));
+                                         
+                                         /* Mark this space as dirty. We already have our free space. */
+                                         D1(printk("Dirty space: Starting 0x%x for 0x%x bytes\n",
+                                                   (unsigned int) start, (unsigned int) (pos - start)));
+                                         jffs_fmalloced(fmc, (__u32) start,
+                                                        (__u32) (pos - start), NULL);                                      
+                                 }
+                                 
+                        }
+                        if(num_free_space > NUMFREEALLOWED){
+                                 printk(KERN_WARNING "jffs_scan_flash(): Found free space "
+                                        "number %i. Only %i free space is allowed.\n",
+                                        num_free_space, NUMFREEALLOWED);                              
+                        }
+                        continue;
+
+                case JFFS_DIRTY_BITMASK:
+                        /* We have found 0x00000000 at this position.  Scan as far
+                           as possible to find out how much is dirty.  */
+                        D1(printk("jffs_scan_flash(): 0x00000000 at pos 0x%lx.\n",
+                                  (long)pos));
+                        for (; pos < end
+                               && JFFS_DIRTY_BITMASK == flash_read_u32(fmc->mtd, pos);
+                             pos += 4);
+                        D1(printk("jffs_scan_flash(): 0x00 ended at "
+                                  "pos 0x%lx.\n", (long)pos));
+                        jffs_fmalloced(fmc, (__u32) start,
+                                       (__u32) (pos - start), NULL);
+                        continue;
+
+                case JFFS_MAGIC_BITMASK:
+                        /* We have probably found a new raw inode.  */
+                        break;
+
+                default:
+                bad_inode:
+                        /* We're f*cked.  This is not solved yet.  We have
+                           to scan for the magic pattern.  */
+                        D1(printk("*************** Dirty flash memory or "
+                                  "bad inode: "
+                                  "hexdump(pos = 0x%lx, len = 128):\n",
+                                  (long)pos));
+                        D1(jffs_hexdump(fmc->mtd, pos, 128));
+
+                        for (pos += 4; pos < end; pos += 4) {
+                                switch (flash_read_u32(fmc->mtd, pos)) {
+                                case JFFS_MAGIC_BITMASK:
+                                case JFFS_EMPTY_BITMASK:
+                                        /* handle these in the main switch() loop */
+                                        goto cont_scan;
+
+                                default:
+                                        break;
+                                }
+                        }
+
+                        cont_scan:
+                        /* First, mark as dirty the region
+                           which really does contain crap. */
+                        jffs_fmalloced(fmc, (__u32) start,
+                                       (__u32) (pos - start),
+                                       NULL);
+                        
+                        continue;
+                }/* switch */
+
+                /* We have found the beginning of an inode.  Create a
+                   node for it unless there already is one available.  */
+                if (!node) {
+                        if (!(node = jffs_alloc_node())) {
+                                /* Free read buffer */
+                                kfree (read_buf);
+
+                                /* Release the flash device */
+                                flash_safe_release(fmc->mtd);
+        
+                                return -ENOMEM;
+                        }
+                        DJM(no_jffs_node++);
+                }
+
+                /* Read the next raw inode.  */
+
+                flash_safe_read(fmc->mtd, pos, (u_char *) &raw_inode,
+                                sizeof(struct jffs_raw_inode));
+
+                /* When we compute the checksum for the inode, we never
+                   count the 'accurate' or the 'checksum' fields.  */
+                tmp_accurate = raw_inode.accurate;
+                tmp_chksum = raw_inode.chksum;
+                raw_inode.accurate = 0;
+                raw_inode.chksum = 0;
+                checksum = jffs_checksum(&raw_inode,
+                                         sizeof(struct jffs_raw_inode));
+                raw_inode.accurate = tmp_accurate;
+                raw_inode.chksum = tmp_chksum;
+
+                D3(printk("*** We have found this raw inode at pos 0x%lx "
+                          "on the flash:\n", (long)pos));
+                D3(jffs_print_raw_inode(&raw_inode));
+
+                if (checksum != raw_inode.chksum) {
+                        D1(printk("jffs_scan_flash(): Bad checksum: "
+                                  "checksum = %u, "
+                                  "raw_inode.chksum = %u\n",
+                                  checksum, raw_inode.chksum));
+                        pos += sizeof(struct jffs_raw_inode);
+                        jffs_fmalloced(fmc, (__u32) start,
+                                       (__u32) (pos - start), NULL);
+                        /* Reuse this unused struct jffs_node.  */
+                        continue;
+                }
+
+                /* Check the raw inode read so far.  Start with the
+                   maximum length of the filename.  */
+                if (raw_inode.nsize > JFFS_MAX_NAME_LEN) {
+                        printk(KERN_WARNING "jffs_scan_flash: Found a "
+                               "JFFS node with name too large\n");
+                        goto bad_inode;
+                }
+
+                if (raw_inode.rename && raw_inode.dsize != sizeof(__u32)) {
+                        printk(KERN_WARNING "jffs_scan_flash: Found a "
+                               "rename node with dsize %u.\n",
+                               raw_inode.dsize);
+                        jffs_print_raw_inode(&raw_inode);
+                        goto bad_inode;
+                }
+
+                /* The node's data segment should not exceed a
+                   certain length.  */
+                if (raw_inode.dsize > fmc->max_chunk_size) {
+                        printk(KERN_WARNING "jffs_scan_flash: Found a "
+                               "JFFS node with dsize (0x%x) > max_chunk_size (0x%x)\n",
+                               raw_inode.dsize, fmc->max_chunk_size);
+                        goto bad_inode;
+                }
+
+                pos += sizeof(struct jffs_raw_inode);
+
+                /* This shouldn't be necessary because a node that
+                   violates the flash boundaries shouldn't be written
+                   in the first place. */
+                if (pos >= end) {
+                        goto check_node;
+                }
+
+                /* Read the name.  */
+                *name = 0;
+                if (raw_inode.nsize) {
+                        flash_safe_read(fmc->mtd, pos, name, raw_inode.nsize);
+                        name[raw_inode.nsize] = '\0';
+                        pos += raw_inode.nsize
+                               + JFFS_GET_PAD_BYTES(raw_inode.nsize);
+                        D3(printk("name == \"%s\"\n", name));
+                        checksum = jffs_checksum(name, raw_inode.nsize);
+                        if (checksum != raw_inode.nchksum) {
+                                D1(printk("jffs_scan_flash(): Bad checksum: "
+                                          "checksum = %u, "
+                                          "raw_inode.nchksum = %u\n",
+                                          checksum, raw_inode.nchksum));
+                                jffs_fmalloced(fmc, (__u32) start,
+                                               (__u32) (pos - start), NULL);
+                                /* Reuse this unused struct jffs_node.  */
+                                continue;
+                        }
+                        if (pos >= end) {
+                                goto check_node;
+                        }
+                }
+
+                /* Read the data, if it exists, in order to be sure it
+                   matches the checksum.  */
+                if (raw_inode.dsize) {
+                        if (raw_inode.rename) {
+                                deleted_file = flash_read_u32(fmc->mtd, pos);
+                        }
+                        if (jffs_checksum_flash(fmc->mtd, pos, raw_inode.dsize, &checksum)) {
+                                printk("jffs_checksum_flash() failed to calculate a checksum\n");
+                                jffs_fmalloced(fmc, (__u32) start,
+                                               (__u32) (pos - start), NULL);
+                                /* Reuse this unused struct jffs_node.  */
+                                continue;
+                        }                               
+                        pos += raw_inode.dsize
+                               + JFFS_GET_PAD_BYTES(raw_inode.dsize);
+
+                        if (checksum != raw_inode.dchksum) {
+                                D1(printk("jffs_scan_flash(): Bad checksum: "
+                                          "checksum = %u, "
+                                          "raw_inode.dchksum = %u\n",
+                                          checksum, raw_inode.dchksum));
+                                jffs_fmalloced(fmc, (__u32) start,
+                                               (__u32) (pos - start), NULL);
+                                /* Reuse this unused struct jffs_node.  */
+                                continue;
+                        }
+                }
+
+                check_node:
+
+                /* Remember the highest inode number in the whole file
+                   system.  This information will be used when assigning
+                   new files new inode numbers.  */
+                if (c->next_ino <= raw_inode.ino) {
+                        c->next_ino = raw_inode.ino + 1;
+                }
+
+                if (raw_inode.accurate) {
+                        int err;
+                        node->data_offset = raw_inode.offset;
+                        node->data_size = raw_inode.dsize;
+                        node->removed_size = raw_inode.rsize;
+                        /* Compute the offset to the actual data in the
+                           on-flash node.  */
+                        node->fm_offset
+                        = sizeof(struct jffs_raw_inode)
+                          + raw_inode.nsize
+                          + JFFS_GET_PAD_BYTES(raw_inode.nsize);
+                        node->fm = jffs_fmalloced(fmc, (__u32) start,
+                                                  (__u32) (pos - start),
+                                                  node);
+                        if (!node->fm) {
+                                D(printk("jffs_scan_flash(): !node->fm\n"));
+                                jffs_free_node(node);
+                                DJM(no_jffs_node--);
+
+                                /* Free read buffer */
+                                kfree (read_buf);
+
+                                /* Release the flash device */
+                                flash_safe_release(fmc->mtd);
+
+                                return -ENOMEM;
+                        }
+                        if ((err = jffs_insert_node(c, NULL, &raw_inode,
+                                                    name, node)) < 0) {
+                                printk("JFFS: Failed to handle raw inode. "
+                                       "(err = %d)\n", err);
+                                break;
+                        }
+                        if (raw_inode.rename) {
+                                struct jffs_delete_list *dl
+                                = (struct jffs_delete_list *)
+                                  kmalloc(sizeof(struct jffs_delete_list),
+                                          GFP_KERNEL);
+                                if (!dl) {
+                                        D(printk("jffs_scan_flash: !dl\n"));
+                                        jffs_free_node(node);
+                                        DJM(no_jffs_node--);
+
+                                        /* Release the flash device */
+                                        flash_safe_release(fmc->flash_part);
+
+                                        /* Free read buffer */
+                                        kfree (read_buf);
+
+                                        return -ENOMEM;
+                                }
+                                dl->ino = deleted_file;
+                                dl->next = c->delete_list;
+                                c->delete_list = dl;
+                                node->data_size = 0;
+                        }
+                        D3(jffs_print_node(node));
+                        node = NULL; /* Don't free the node!  */
+                }
+                else {
+                        jffs_fmalloced(fmc, (__u32) start,
+                                       (__u32) (pos - start), NULL);
+                        D3(printk("jffs_scan_flash(): Just found an obsolete "
+                                  "raw_inode. Continuing the scan...\n"));
+                        /* Reuse this unused struct jffs_node.  */
+                }
+        }
+
+        if (node) {
+                jffs_free_node(node);
+                DJM(no_jffs_node--);
+        }
+        jffs_build_end(fmc);
+
+        /* Free read buffer */
+        kfree (read_buf);
+
+        if(!num_free_space){
+                printk(KERN_WARNING "jffs_scan_flash(): Did not find even a single "
+                       "chunk of free space. This is BAD!\n");
+        }
+
+        /* Return happy */
+        D3(printk("jffs_scan_flash(): Leaving...\n"));
+        flash_safe_release(fmc->mtd);
+
+        /* This is to trap the "free size accounting screwed error. */
+        free_chunk_size1 = jffs_free_size1(fmc);
+        free_chunk_size2 = jffs_free_size2(fmc);
+
+        if (free_chunk_size1 + free_chunk_size2 != fmc->free_size) {
+
+                printk(KERN_WARNING "jffs_scan_falsh():Free size accounting screwed\n");
+                printk(KERN_WARNING "jfffs_scan_flash():free_chunk_size1 == 0x%x, "
+                       "free_chunk_size2 == 0x%x, fmc->free_size == 0x%x\n", 
+                       free_chunk_size1, free_chunk_size2, fmc->free_size);
+
+                return -1; /* Do NOT mount f/s so that we can inspect what happened.
+                              Mounting this  screwed up f/s will screw us up anyway.
+                            */
+        }       
+
+        return 0; /* as far as we are concerned, we are happy! */
+} /* jffs_scan_flash()  */
+
+
+/* Insert any kind of node into the file system.  Take care of data
+   insertions and deletions.  Also remove redundant information. The
+   memory allocated for the `name' is regarded as "given away" in the
+   caller's perspective.  */
+int
+jffs_insert_node(struct jffs_control *c, struct jffs_file *f,
+                 const struct jffs_raw_inode *raw_inode,
+                 const char *name, struct jffs_node *node)
+{
+        int update_name = 0;
+        int insert_into_tree = 0;
+
+        D2(printk("jffs_insert_node(): ino = %u, version = %u, "
+                  "name = \"%s\", deleted = %d\n",
+                  raw_inode->ino, raw_inode->version,
+                  ((name && *name) ? name : ""), raw_inode->deleted));
+
+        /* If there doesn't exist an associated jffs_file, then
+           create, initialize and insert one into the file system.  */
+        if (!f && !(f = jffs_find_file(c, raw_inode->ino))) {
+                if (!(f = jffs_create_file(c, raw_inode))) {
+                        return -ENOMEM;
+                }
+                jffs_insert_file_into_hash(f);
+                insert_into_tree = 1;
+        }
+        node->ino = raw_inode->ino;
+        node->version = raw_inode->version;
+        node->data_size = raw_inode->dsize;
+        node->fm_offset = sizeof(struct jffs_raw_inode) + raw_inode->nsize
+                          + JFFS_GET_PAD_BYTES(raw_inode->nsize);
+        node->name_size = raw_inode->nsize;
+
+        /* Now insert the node at the correct position into the file's
+           version list.  */
+        if (!f->version_head) {
+                /* This is the first node.  */
+                f->version_head = node;
+                f->version_tail = node;
+                node->version_prev = NULL;
+                node->version_next = NULL;
+                f->highest_version = node->version;
+                update_name = 1;
+                f->mode = raw_inode->mode;
+                f->uid = raw_inode->uid;
+                f->gid = raw_inode->gid;
+                f->atime = raw_inode->atime;
+                f->mtime = raw_inode->mtime;
+                f->ctime = raw_inode->ctime;
+        }
+        else if ((f->highest_version < node->version)
+                 || (node->version == 0)) {
+                /* Insert at the end of the list.  I.e. this node is the
+                   newest one so far.  */
+                node->version_prev = f->version_tail;
+                node->version_next = NULL;
+                f->version_tail->version_next = node;
+                f->version_tail = node;
+                f->highest_version = node->version;
+                update_name = 1;
+                f->pino = raw_inode->pino;
+                f->mode = raw_inode->mode;
+                f->uid = raw_inode->uid;
+                f->gid = raw_inode->gid;
+                f->atime = raw_inode->atime;
+                f->mtime = raw_inode->mtime;
+                f->ctime = raw_inode->ctime;
+        }
+        else if (f->version_head->version > node->version) {
+                /* Insert at the bottom of the list.  */
+                node->version_prev = NULL;
+                node->version_next = f->version_head;
+                f->version_head->version_prev = node;
+                f->version_head = node;
+                if (!f->name) {
+                        update_name = 1;
+                }
+        }
+        else {
+                struct jffs_node *n;
+                int newer_name = 0;
+                /* Search for the insertion position starting from
+                   the tail (newest node).  */
+                for (n = f->version_tail; n; n = n->version_prev) {
+                        if (n->version < node->version) {
+                                node->version_prev = n;
+                                node->version_next = n->version_next;
+                                node->version_next->version_prev = node;
+                                n->version_next = node;
+                                if (!newer_name) {
+                                        update_name = 1;
+                                }
+                                break;
+                        }
+                        if (n->name_size) {
+                                newer_name = 1;
+                        }
+                }
+        }
+
+        /* Deletion is irreversible. If any 'deleted' node is ever
+           written, the file is deleted */
+        if (raw_inode->deleted)
+                f->deleted = raw_inode->deleted;
+
+        /* Perhaps update the name.  */
+        if (raw_inode->nsize && update_name && name && *name && (name != f->name)) {
+                if (f->name) {
+                        kfree(f->name);
+                        DJM(no_name--);
+                }
+                if (!(f->name = (char *) kmalloc(raw_inode->nsize + 1,
+                                                 GFP_KERNEL))) {
+                        return -ENOMEM;
+                }
+                DJM(no_name++);
+                memcpy(f->name, name, raw_inode->nsize);
+                f->name[raw_inode->nsize] = '\0';
+                f->nsize = raw_inode->nsize;
+                D3(printk("jffs_insert_node(): Updated the name of "
+                          "the file to \"%s\".\n", name));
+        }
+
+        if (!c->building_fs) {
+                D3(printk("jffs_insert_node(): ---------------------------"
+                          "------------------------------------------- 1\n"));
+                if (insert_into_tree) {
+                        jffs_insert_file_into_tree(f);
+                }
+                /* Once upon a time, we would call jffs_possibly_delete_file()
+                   here. That causes an oops if someone's still got the file
+                   open, so now we only do it in jffs_delete_inode()
+                   -- dwmw2
+                */
+                if (node->data_size || node->removed_size) {
+                        jffs_update_file(f, node);
+                }
+                jffs_remove_redundant_nodes(f);
+
+                jffs_garbage_collect_trigger(c);
+
+                D3(printk("jffs_insert_node(): ---------------------------"
+                          "------------------------------------------- 2\n"));
+        }
+
+        return 0;
+} /* jffs_insert_node()  */
+
+
+/* Unlink a jffs_node from the version list it is in.  */
+static inline void
+jffs_unlink_node_from_version_list(struct jffs_file *f,
+                                   struct jffs_node *node)
+{
+        if (node->version_prev) {
+                node->version_prev->version_next = node->version_next;
+        } else {
+                f->version_head = node->version_next;
+        }
+        if (node->version_next) {
+                node->version_next->version_prev = node->version_prev;
+        } else {
+                f->version_tail = node->version_prev;
+        }
+}
+
+
+/* Unlink a jffs_node from the range list it is in.  */
+static inline void
+jffs_unlink_node_from_range_list(struct jffs_file *f, struct jffs_node *node)
+{
+        if (node->range_prev) {
+                node->range_prev->range_next = node->range_next;
+        }
+        else {
+                f->range_head = node->range_next;
+        }
+        if (node->range_next) {
+                node->range_next->range_prev = node->range_prev;
+        }
+        else {
+                f->range_tail = node->range_prev;
+        }
+}
+
+
+/* Function used by jffs_remove_redundant_nodes() below.  This function
+   classifies what kind of information a node adds to a file.  */
+static inline __u8
+jffs_classify_node(struct jffs_node *node)
+{
+        __u8 mod_type = JFFS_MODIFY_INODE;
+
+        if (node->name_size) {
+                mod_type |= JFFS_MODIFY_NAME;
+        }
+        if (node->data_size || node->removed_size) {
+                mod_type |= JFFS_MODIFY_DATA;
+        }
+        return mod_type;
+}
+
+
+/* Remove redundant nodes from a file.  Mark the on-flash memory
+   as dirty.  */
+static int
+jffs_remove_redundant_nodes(struct jffs_file *f)
+{
+        struct jffs_node *newest_node;
+        struct jffs_node *cur;
+        struct jffs_node *prev;
+        __u8 newest_type;
+        __u8 mod_type;
+        __u8 node_with_name_later = 0;
+
+        if (!(newest_node = f->version_tail)) {
+                return 0;
+        }
+
+        /* What does the `newest_node' modify?  */
+        newest_type = jffs_classify_node(newest_node);
+        node_with_name_later = newest_type & JFFS_MODIFY_NAME;
+
+        D3(printk("jffs_remove_redundant_nodes(): ino: %u, name: \"%s\", "
+                  "newest_type: %u\n", f->ino, (f->name ? f->name : ""),
+                  newest_type));
+
+        /* Traverse the file's nodes and determine which of them that are
+           superfluous.  Yeah, this might look very complex at first
+           glance but it is actually very simple.  */
+        for (cur = newest_node->version_prev; cur; cur = prev) {
+                prev = cur->version_prev;
+                mod_type = jffs_classify_node(cur);
+                if ((mod_type <= JFFS_MODIFY_INODE)
+                    || ((newest_type & JFFS_MODIFY_NAME)
+                        && (mod_type
+                            <= (JFFS_MODIFY_INODE + JFFS_MODIFY_NAME)))
+                    || (cur->data_size == 0 && cur->removed_size
+                        && !cur->version_prev && node_with_name_later)) {
+                        /* Yes, this node is redundant. Remove it.  */
+                        D2(printk("jffs_remove_redundant_nodes(): "
+                                  "Removing node: ino: %u, version: %u, "
+                                  "mod_type: %u\n", cur->ino, cur->version,
+                                  mod_type));
+                        jffs_unlink_node_from_version_list(f, cur);
+                        jffs_fmfree(f->c->fmc, cur->fm, cur);
+                        jffs_free_node(cur);
+                        DJM(no_jffs_node--);
+                }
+                else {
+                        node_with_name_later |= (mod_type & JFFS_MODIFY_NAME);
+                }
+        }
+
+        return 0;
+}
+
+
+/* Insert a file into the hash table.  */
+static int
+jffs_insert_file_into_hash(struct jffs_file *f)
+{
+        int i = f->ino % f->c->hash_len;
+
+        D3(printk("jffs_insert_file_into_hash(): f->ino: %u\n", f->ino));
+
+        list_add(&f->hash, &f->c->hash[i]);
+        return 0;
+}
+
+
+/* Insert a file into the file system tree.  */
+int
+jffs_insert_file_into_tree(struct jffs_file *f)
+{
+        struct jffs_file *parent;
+
+        D3(printk("jffs_insert_file_into_tree(): name: \"%s\"\n",
+                  (f->name ? f->name : "")));
+
+        if (!(parent = jffs_find_file(f->c, f->pino))) {
+                if (f->pino == 0) {
+                        f->c->root = f;
+                        f->parent = NULL;
+                        f->sibling_prev = NULL;
+                        f->sibling_next = NULL;
+                        return 0;
+                }
+                else {
+                        D1(printk("jffs_insert_file_into_tree(): Found "
+                                  "inode with no parent and pino == %u\n",
+                                  f->pino));
+                        return -1;
+                }
+        }
+        f->parent = parent;
+        f->sibling_next = parent->children;
+        if (f->sibling_next) {
+                f->sibling_next->sibling_prev = f;
+        }
+        f->sibling_prev = NULL;
+        parent->children = f;
+        return 0;
+}
+
+
+/* Remove a file from the hash table.  */
+static int
+jffs_unlink_file_from_hash(struct jffs_file *f)
+{
+        D3(printk("jffs_unlink_file_from_hash(): f: 0x%p, "
+                  "ino %u\n", f, f->ino));
+
+        list_del(&f->hash);
+        return 0;
+}
+
+
+/* Just remove the file from the parent's children.  Don't free
+   any memory.  */
+int
+jffs_unlink_file_from_tree(struct jffs_file *f)
+{
+        D3(printk("jffs_unlink_file_from_tree(): ino: %d, pino: %d, name: "
+                  "\"%s\"\n", f->ino, f->pino, (f->name ? f->name : "")));
+
+        if (f->sibling_prev) {
+                f->sibling_prev->sibling_next = f->sibling_next;
+        }
+        else if (f->parent) {
+                D3(printk("f->parent=%p\n", f->parent));
+                f->parent->children = f->sibling_next;
+        }
+        if (f->sibling_next) {
+                f->sibling_next->sibling_prev = f->sibling_prev;
+        }
+        return 0;
+}
+
+
+/* Find a file with its inode number.  */
+struct jffs_file *
+jffs_find_file(struct jffs_control *c, __u32 ino)
+{
+        struct jffs_file *f;
+        int i = ino % c->hash_len;
+        struct list_head *tmp;
+
+        D3(printk("jffs_find_file(): ino: %u\n", ino));
+
+        for (tmp = c->hash[i].next; tmp != &c->hash[i]; tmp = tmp->next) {
+                f = list_entry(tmp, struct jffs_file, hash);
+                if (ino != f->ino)
+                        continue;
+                D3(printk("jffs_find_file(): Found file with ino "
+                               "%u. (name: \"%s\")\n",
+                               ino, (f->name ? f->name : ""));
+                );
+                return f;
+        }
+        D3(printk("jffs_find_file(): Didn't find file "
+                         "with ino %u.\n", ino);
+        );
+        return NULL;
+}
+
+
+/* Find a file in a directory.  We are comparing the names.  */
+struct jffs_file *
+jffs_find_child(struct jffs_file *dir, const char *name, int len)
+{
+        struct jffs_file *f;
+
+        D3(printk("jffs_find_child()\n"));
+
+        for (f = dir->children; f; f = f->sibling_next) {
+                if (!f->deleted && f->name
+                    && !strncmp(f->name, name, len)
+                    && f->name[len] == '\0') {
+                        break;
+                }
+        }
+
+        D3(if (f) {
+                printk("jffs_find_child(): Found \"%s\".\n", f->name);
+        }
+        else {
+                char *copy = (char *) kmalloc(len + 1, GFP_KERNEL);
+                if (copy) {
+                        memcpy(copy, name, len);
+                        copy[len] = '\0';
+                }
+                printk("jffs_find_child(): Didn't find the file \"%s\".\n",
+                       (copy ? copy : ""));
+                if (copy) {
+                        kfree(copy);
+                }
+        });
+
+        return f;
+}
+
+
+/* Write a raw inode that takes up a certain amount of space in the flash
+   memory.  At the end of the flash device, there is often space that is
+   impossible to use.  At these times we want to mark this space as not
+   used.  In the cases when the amount of space is greater or equal than
+   a struct jffs_raw_inode, we write a "dummy node" that takes up this
+   space.  The space after the raw inode, if it exists, is left as it is.
+   Since this space after the raw inode contains JFFS_EMPTY_BITMASK bytes,
+   we can compute the checksum of it; we don't have to manipulate it any
+   further.
+
+   If the space left on the device is less than the size of a struct
+   jffs_raw_inode, this space is filled with JFFS_DIRTY_BITMASK bytes.
+   No raw inode is written this time.  */
+static int
+jffs_write_dummy_node(struct jffs_control *c, struct jffs_fm *dirty_fm)
+{
+        struct jffs_fmcontrol *fmc = c->fmc;
+        int err;
+
+        D1(printk("jffs_write_dummy_node(): dirty_fm->offset = 0x%08x, "
+                  "dirty_fm->size = %u\n",
+                  dirty_fm->offset, dirty_fm->size));
+
+        if (dirty_fm->size >= sizeof(struct jffs_raw_inode)) {
+                struct jffs_raw_inode raw_inode;
+                memset(&raw_inode, 0, sizeof(struct jffs_raw_inode));
+                raw_inode.magic = JFFS_MAGIC_BITMASK;
+                raw_inode.dsize = dirty_fm->size
+                                  - sizeof(struct jffs_raw_inode);
+                raw_inode.dchksum = raw_inode.dsize * 0xff;
+                raw_inode.chksum
+                = jffs_checksum(&raw_inode, sizeof(struct jffs_raw_inode));
+
+                if ((err = flash_safe_write(fmc->mtd,
+                                            dirty_fm->offset,
+                                            (u_char *)&raw_inode,
+                                            sizeof(struct jffs_raw_inode)))
+                    < 0) {
+                        printk(KERN_ERR "JFFS: jffs_write_dummy_node: "
+                               "flash_safe_write failed!\n");
+                        return err;
+                }
+        }
+        else {
+                flash_safe_acquire(fmc->mtd);
+                flash_memset(fmc->mtd, dirty_fm->offset, 0, dirty_fm->size);
+                flash_safe_release(fmc->mtd);
+        }
+
+        D3(printk("jffs_write_dummy_node(): Leaving...\n"));
+        return 0;
+}
+
+
+/* Write a raw inode, possibly its name and possibly some data.  */
+int
+jffs_write_node(struct jffs_control *c, struct jffs_node *node,
+                struct jffs_raw_inode *raw_inode,
+                const char *name, const unsigned char *data,
+                int recoverable,
+                struct jffs_file *f)
+{
+        struct jffs_fmcontrol *fmc = c->fmc;
+        struct jffs_fm *fm;
+        struct kvec node_iovec[4];
+        unsigned long iovec_cnt;
+
+        __u32 pos;
+        int err;
+        __u32 slack = 0;
+
+        __u32 total_name_size = raw_inode->nsize
+                                + JFFS_GET_PAD_BYTES(raw_inode->nsize);
+        __u32 total_data_size = raw_inode->dsize
+                                + JFFS_GET_PAD_BYTES(raw_inode->dsize);
+        __u32 total_size = sizeof(struct jffs_raw_inode)
+                           + total_name_size + total_data_size;
+        
+        /* If this node isn't something that will eventually let
+           GC free even more space, then don't allow it unless
+           there's at least max_chunk_size space still available
+        */
+        if (!recoverable)
+                slack = fmc->max_chunk_size;
+                
+
+        /* Fire the retrorockets and shoot the fruiton torpedoes, sir!  */
+
+        ASSERT(if (!node) {
+                printk("jffs_write_node(): node == NULL\n");
+                return -EINVAL;
+        });
+        ASSERT(if (raw_inode && raw_inode->nsize && !name) {
+                printk("*** jffs_write_node(): nsize = %u but name == NULL\n",
+                       raw_inode->nsize);
+                return -EINVAL;
+        });
+
+        D1(printk("jffs_write_node(): filename = \"%s\", ino = %u, "
+                  "total_size = %u\n",
+                  (name ? name : ""), raw_inode->ino,
+                  total_size));
+
+        jffs_fm_write_lock(fmc);
+
+retry:
+        fm = NULL;
+        err = 0;
+        while (!fm) {
+
+                /* Deadlocks suck. */
+                while(fmc->free_size < fmc->min_free_size + total_size + slack) {
+                        jffs_fm_write_unlock(fmc);
+                        if (!JFFS_ENOUGH_SPACE(c, total_size + slack))
+                                return -ENOSPC;
+                        jffs_fm_write_lock(fmc);
+                }
+
+                /* First try to allocate some flash memory.  */
+                err = jffs_fmalloc(fmc, total_size, node, &fm);
+                
+                if (err == -ENOSPC) {
+                        /* Just out of space. GC and try again */
+                        if (fmc->dirty_size < fmc->sector_size) {
+                                D(printk("jffs_write_node(): jffs_fmalloc(0x%p, %u) "
+                                         "failed, no dirty space to GC\n", fmc,
+                                         total_size));
+                                return err;
+                        }
+                        
+                        D1(printk(KERN_INFO "jffs_write_node(): Calling jffs_garbage_collect_now()\n"));
+                        jffs_fm_write_unlock(fmc);
+                        if ((err = jffs_garbage_collect_now(c))) {
+                                D(printk("jffs_write_node(): jffs_garbage_collect_now() failed\n"));
+                                return err;
+                        }
+                        jffs_fm_write_lock(fmc);
+                        continue;
+                } 
+
+                if (err < 0) {
+                        jffs_fm_write_unlock(fmc);
+
+                        D(printk("jffs_write_node(): jffs_fmalloc(0x%p, %u) "
+                                 "failed!\n", fmc, total_size));
+                        return err;
+                }
+
+                if (!fm->nodes) {
+                        /* The jffs_fm struct that we got is not good enough.
+                           Make that space dirty and try again  */
+                        if ((err = jffs_write_dummy_node(c, fm)) < 0) {
+                                kfree(fm);
+                                DJM(no_jffs_fm--);
+                                jffs_fm_write_unlock(fmc);
+                                D(printk("jffs_write_node(): "
+                                         "jffs_write_dummy_node(): Failed!\n"));
+                                return err;
+                        }
+                        fm = NULL;
+                }
+        } /* while(!fm) */
+        node->fm = fm;
+
+        ASSERT(if (fm->nodes == 0) {
+                printk(KERN_ERR "jffs_write_node(): fm->nodes == 0\n");
+        });
+
+        pos = node->fm->offset;
+
+        /* Increment the version number here. We can't let the caller
+           set it beforehand, because we might have had to do GC on a node
+           of this file - and we'd end up reusing version numbers.
+        */
+        if (f) {
+                raw_inode->version = f->highest_version + 1;
+                D1(printk (KERN_NOTICE "jffs_write_node(): setting version of %s to %d\n", f->name, raw_inode->version));
+
+                /* if the file was deleted, set the deleted bit in the raw inode */
+                if (f->deleted)
+                        raw_inode->deleted = 1;
+        }
+
+        /* Compute the checksum for the data and name chunks.  */
+        raw_inode->dchksum = jffs_checksum(data, raw_inode->dsize);
+        raw_inode->nchksum = jffs_checksum(name, raw_inode->nsize);
+
+        /* The checksum is calculated without the chksum and accurate
+           fields so set them to zero first.  */
+        raw_inode->accurate = 0;
+        raw_inode->chksum = 0;
+        raw_inode->chksum = jffs_checksum(raw_inode,
+                                          sizeof(struct jffs_raw_inode));
+        raw_inode->accurate = 0xff;
+
+        D3(printk("jffs_write_node(): About to write this raw inode to the "
+                  "flash at pos 0x%lx:\n", (long)pos));
+        D3(jffs_print_raw_inode(raw_inode));
+
+        /* The actual raw JFFS node */
+        node_iovec[0].iov_base = (void *) raw_inode;
+        node_iovec[0].iov_len = (size_t) sizeof(struct jffs_raw_inode);
+        iovec_cnt = 1;
+
+        /* Get name and size if there is one */
+        if (raw_inode->nsize) {
+                node_iovec[iovec_cnt].iov_base = (void *) name;
+                node_iovec[iovec_cnt].iov_len = (size_t) raw_inode->nsize;
+                iovec_cnt++;
+
+                if (JFFS_GET_PAD_BYTES(raw_inode->nsize)) {
+                        static char allff[3]={255,255,255};
+                        /* Add some extra padding if necessary */
+                        node_iovec[iovec_cnt].iov_base = allff;
+                        node_iovec[iovec_cnt].iov_len =
+                                JFFS_GET_PAD_BYTES(raw_inode->nsize);
+                        iovec_cnt++;
+                }
+        }
+
+        /* Get data and size if there is any */
+        if (raw_inode->dsize) {
+                node_iovec[iovec_cnt].iov_base = (void *) data;
+                node_iovec[iovec_cnt].iov_len = (size_t) raw_inode->dsize;
+                iovec_cnt++;
+                /* No need to pad this because we're not actually putting
+                   anything after it.
+                */
+        }
+
+        if ((err = flash_safe_writev(fmc->mtd, node_iovec, iovec_cnt,
+                                    pos)) < 0) {
+                jffs_fmfree_partly(fmc, fm, 0);
+                jffs_fm_write_unlock(fmc);
+                printk(KERN_ERR "JFFS: jffs_write_node: Failed to write, "
+                       "requested %i, wrote %i\n", total_size, err);
+                goto retry;
+        }
+        if (raw_inode->deleted)
+                f->deleted = 1;
+
+        jffs_fm_write_unlock(fmc);
+        D3(printk("jffs_write_node(): Leaving...\n"));
+        return raw_inode->dsize;
+} /* jffs_write_node()  */
+
+
+/* Read data from the node and write it to the buffer.  'node_offset'
+   is how much we have read from this particular node before and which
+   shouldn't be read again.  'max_size' is how much space there is in
+   the buffer.  */
+static int
+jffs_get_node_data(struct jffs_file *f, struct jffs_node *node, 
+                   unsigned char *buf,__u32 node_offset, __u32 max_size)
+{
+        struct jffs_fmcontrol *fmc = f->c->fmc;
+        __u32 pos = node->fm->offset + node->fm_offset + node_offset;
+        __u32 avail = node->data_size - node_offset;
+        __u32 r;
+
+        D2(printk("  jffs_get_node_data(): file: \"%s\", ino: %u, "
+                  "version: %u, node_offset: %u\n",
+                  f->name, node->ino, node->version, node_offset));
+
+        r = min(avail, max_size);
+        D3(printk(KERN_NOTICE "jffs_get_node_data\n"));
+        flash_safe_read(fmc->mtd, pos, buf, r);
+
+        D3(printk("  jffs_get_node_data(): Read %u byte%s.\n",
+                  r, (r == 1 ? "" : "s")));
+
+        return r;
+}
+
+
+/* Read data from the file's nodes.  Write the data to the buffer
+   'buf'.  'read_offset' tells how much data we should skip.  */
+int
+jffs_read_data(struct jffs_file *f, unsigned char *buf, __u32 read_offset,
+               __u32 size)
+{
+        struct jffs_node *node;
+        __u32 read_data = 0; /* Total amount of read data.  */
+        __u32 node_offset = 0;
+        __u32 pos = 0; /* Number of bytes traversed.  */
+
+        D2(printk("jffs_read_data(): file = \"%s\", read_offset = %d, "
+                  "size = %u\n",
+                  (f->name ? f->name : ""), read_offset, size));
+
+        if (read_offset >= f->size) {
+                D(printk("  f->size: %d\n", f->size));
+                return 0;
+        }
+
+        /* First find the node to read data from.  */
+        node = f->range_head;
+        while (pos <= read_offset) {
+                node_offset = read_offset - pos;
+                if (node_offset >= node->data_size) {
+                        pos += node->data_size;
+                        node = node->range_next;
+                }
+                else {
+                        break;
+                }
+        }
+
+        /* "Cats are living proof that not everything in nature
+           has to be useful."
+           - Garrison Keilor ('97)  */
+
+        /* Fill the buffer.  */
+        while (node && (read_data < size)) {
+                int r;
+                if (!node->fm) {
+                        /* This node does not refer to real data.  */
+                        r = min(size - read_data,
+                                     node->data_size - node_offset);
+                        memset(&buf[read_data], 0, r);
+                }
+                else if ((r = jffs_get_node_data(f, node, &buf[read_data],
+                                                 node_offset,
+                                                 size - read_data)) < 0) {
+                        return r;
+                }
+                read_data += r;
+                node_offset = 0;
+                node = node->range_next;
+        }
+        D3(printk("  jffs_read_data(): Read %u bytes.\n", read_data));
+        return read_data;
+}
+
+
+/* Used for traversing all nodes in the hash table.  */
+int
+jffs_foreach_file(struct jffs_control *c, int (*func)(struct jffs_file *))
+{
+        int pos;
+        int r;
+        int result = 0;
+
+        for (pos = 0; pos < c->hash_len; pos++) {
+                struct list_head *p, *next;
+                for (p = c->hash[pos].next; p != &c->hash[pos]; p = next) {
+                        /* We need a reference to the next file in the
+                           list because `func' might remove the current
+                           file `f'.  */
+                        next = p->next;
+                        r = func(list_entry(p, struct jffs_file, hash));
+                        if (r < 0)
+                                return r;
+                        result += r;
+                }
+        }
+
+        return result;
+}
+
+
+/* Free all nodes associated with a file.  */
+static int
+jffs_free_node_list(struct jffs_file *f)
+{
+        struct jffs_node *node;
+        struct jffs_node *p;
+
+        D3(printk("jffs_free_node_list(): f #%u, \"%s\"\n",
+                  f->ino, (f->name ? f->name : "")));
+        node = f->version_head;
+        while (node) {
+                p = node;
+                node = node->version_next;
+                jffs_free_node(p);
+                DJM(no_jffs_node--);
+        }
+        return 0;
+}
+
+
+/* Free a file and its name.  */
+static int
+jffs_free_file(struct jffs_file *f)
+{
+        D3(printk("jffs_free_file: f #%u, \"%s\"\n",
+                  f->ino, (f->name ? f->name : "")));
+
+        if (f->name) {
+                kfree(f->name);
+                DJM(no_name--);
+        }
+        kfree(f);
+        no_jffs_file--;
+        return 0;
+}
+
+static long
+jffs_get_file_count(void)
+{
+        return no_jffs_file;
+}
+
+/* See if a file is deleted. If so, mark that file's nodes as obsolete.  */
+int
+jffs_possibly_delete_file(struct jffs_file *f)
+{
+        struct jffs_node *n;
+
+        D3(printk("jffs_possibly_delete_file(): ino: %u\n",
+                  f->ino));
+
+        ASSERT(if (!f) {
+                printk(KERN_ERR "jffs_possibly_delete_file(): f == NULL\n");
+                return -1;
+        });
+
+        if (f->deleted) {
+                /* First try to remove all older versions.  Commence with
+                   the oldest node.  */
+                for (n = f->version_head; n; n = n->version_next) {
+                        if (!n->fm) {
+                                continue;
+                        }
+                        if (jffs_fmfree(f->c->fmc, n->fm, n) < 0) {
+                                break;
+                        }
+                }
+                /* Unlink the file from the filesystem.  */
+                if (!f->c->building_fs) {
+                        jffs_unlink_file_from_tree(f);
+                }
+                jffs_unlink_file_from_hash(f);
+                jffs_free_node_list(f);
+                jffs_free_file(f);
+        }
+        return 0;
+}
+
+
+/* Used in conjunction with jffs_foreach_file() to count the number
+   of files in the file system.  */
+int
+jffs_file_count(struct jffs_file *f)
+{
+        return 1;
+}
+
+
+/* Build up a file's range list from scratch by going through the
+   version list.  */
+static int
+jffs_build_file(struct jffs_file *f)
+{
+        struct jffs_node *n;
+
+        D3(printk("jffs_build_file(): ino: %u, name: \"%s\"\n",
+                  f->ino, (f->name ? f->name : "")));
+
+        for (n = f->version_head; n; n = n->version_next) {
+                jffs_update_file(f, n);
+        }
+        return 0;
+}
+
+
+/* Remove an amount of data from a file. If this amount of data is
+   zero, that could mean that a node should be split in two parts.
+   We remove or change the appropriate nodes in the lists.
+
+   Starting offset of area to be removed is node->data_offset,
+   and the length of the area is in node->removed_size.   */
+static int
+jffs_delete_data(struct jffs_file *f, struct jffs_node *node)
+{
+        struct jffs_node *n;
+        __u32 offset = node->data_offset;
+        __u32 remove_size = node->removed_size;
+
+        D3(printk("jffs_delete_data(): offset = %u, remove_size = %u\n",
+                  offset, remove_size));
+
+        if (remove_size == 0
+            && f->range_tail
+            && f->range_tail->data_offset + f->range_tail->data_size
+               == offset) {
+                /* A simple append; nothing to remove or no node to split.  */
+                return 0;
+        }
+
+        /* Find the node where we should begin the removal.  */
+        for (n = f->range_head; n; n = n->range_next) {
+                if (n->data_offset + n->data_size > offset) {
+                        break;
+                }
+        }
+        if (!n) {
+                /* If there's no data in the file there's no data to
+                   remove either.  */
+                return 0;
+        }
+
+        if (n->data_offset > offset) {
+                /* XXX: Not implemented yet.  */
+                printk(KERN_WARNING "JFFS: An unexpected situation "
+                       "occurred in jffs_delete_data.\n");
+        }
+        else if (n->data_offset < offset) {
+                /* See if the node has to be split into two parts.  */
+                if (n->data_offset + n->data_size > offset + remove_size) {
+                        /* Do the split.  */
+                        struct jffs_node *new_node;
+                        D3(printk("jffs_delete_data(): Split node with "
+                                  "version number %u.\n", n->version));
+
+                        if (!(new_node = jffs_alloc_node())) {
+                                D(printk("jffs_delete_data(): -ENOMEM\n"));
+                                return -ENOMEM;
+                        }
+                        DJM(no_jffs_node++);
+
+                        new_node->ino = n->ino;
+                        new_node->version = n->version;
+                        new_node->data_offset = offset;
+                        new_node->data_size = n->data_size - (remove_size + (offset - n->data_offset));
+                        new_node->fm_offset = n->fm_offset + (remove_size + (offset - n->data_offset));
+                        new_node->name_size = n->name_size;
+                        new_node->fm = n->fm;
+                        new_node->version_prev = n;
+                        new_node->version_next = n->version_next;
+                        if (new_node->version_next) {
+                                new_node->version_next->version_prev
+                                = new_node;
+                        }
+                        else {
+                                f->version_tail = new_node;
+                        }
+                        n->version_next = new_node;
+                        new_node->range_prev = n;
+                        new_node->range_next = n->range_next;
+                        if (new_node->range_next) {
+                                new_node->range_next->range_prev = new_node;
+                        }
+                        else {
+                                f->range_tail = new_node;
+                        }
+                        /* A very interesting can of worms.  */
+                        n->range_next = new_node;
+                        n->data_size = offset - n->data_offset;
+                        if (new_node->fm)
+                                jffs_add_node(new_node);
+                        else {
+                                D1(printk(KERN_WARNING "jffs_delete_data(): Splitting an empty node (file hold).\n!"));
+                                D1(printk(KERN_WARNING "FIXME: Did dwmw2 do the right thing here?\n"));
+                        }
+                        n = new_node->range_next;
+                        remove_size = 0;
+                }
+                else {
+                        /* No.  No need to split the node.  Just remove
+                           the end of the node.  */
+                        int r = min(n->data_offset + n->data_size
+                                         - offset, remove_size);
+                        n->data_size -= r;
+                        remove_size -= r;
+                        n = n->range_next;
+                }
+        }
+
+        /* Remove as many nodes as necessary.  */
+        while (n && remove_size) {
+                if (n->data_size <= remove_size) {
+                        struct jffs_node *p = n;
+                        remove_size -= n->data_size;
+                        n = n->range_next;
+                        D3(printk("jffs_delete_data(): Removing node: "
+                                  "ino: %u, version: %u%s\n",
+                                  p->ino, p->version,
+                                  (p->fm ? "" : " (virtual)")));
+                        if (p->fm) {
+                                jffs_fmfree(f->c->fmc, p->fm, p);
+                        }
+                        jffs_unlink_node_from_range_list(f, p);
+                        jffs_unlink_node_from_version_list(f, p);
+                        jffs_free_node(p);
+                        DJM(no_jffs_node--);
+                }
+                else {
+                        n->data_size -= remove_size;
+                        n->fm_offset += remove_size;
+                        n->data_offset -= (node->removed_size - remove_size);
+                        n = n->range_next;
+                        break;
+                }
+        }
+
+        /* Adjust the following nodes' information about offsets etc.  */
+        while (n && node->removed_size) {
+                n->data_offset -= node->removed_size;
+                n = n->range_next;
+        }
+
+        if (node->removed_size > (f->size - node->data_offset)) {
+                /* It's possible that the removed_size is in fact
+                 * greater than the amount of data we actually thought
+                 * were present in the first place - some of the nodes 
+                 * which this node originally obsoleted may already have
+                 * been deleted from the flash by subsequent garbage 
+                 * collection.
+                 *
+                 * If this is the case, don't let f->size go negative.
+                 * Bad things would happen :)
+                 */
+                f->size = node->data_offset;
+        } else {
+                f->size -= node->removed_size;
+        }
+        D3(printk("jffs_delete_data(): f->size = %d\n", f->size));
+        return 0;
+} /* jffs_delete_data()  */
+
+
+/* Insert some data into a file.  Prior to the call to this function,
+   jffs_delete_data should be called.  */
+static int
+jffs_insert_data(struct jffs_file *f, struct jffs_node *node)
+{
+        D3(printk("jffs_insert_data(): node->data_offset = %u, "
+                  "node->data_size = %u, f->size = %u\n",
+                  node->data_offset, node->data_size, f->size));
+
+        /* Find the position where we should insert data.  */
+        retry:
+        if (node->data_offset == f->size) {
+                /* A simple append.  This is the most common operation.  */
+                node->range_next = NULL;
+                node->range_prev = f->range_tail;
+                if (node->range_prev) {
+                        node->range_prev->range_next = node;
+                }
+                f->range_tail = node;
+                f->size += node->data_size;
+                if (!f->range_head) {
+                        f->range_head = node;
+                }
+        }
+        else if (node->data_offset < f->size) {
+                /* Trying to insert data into the middle of the file.  This
+                   means no problem because jffs_delete_data() has already
+                   prepared the range list for us.  */
+                struct jffs_node *n;
+
+                /* Find the correct place for the insertion and then insert
+                   the node.  */
+                for (n = f->range_head; n; n = n->range_next) {
+                        D2(printk("Cool stuff's happening!\n"));
+
+                        if (n->data_offset == node->data_offset) {
+                                node->range_prev = n->range_prev;
+                                if (node->range_prev) {
+                                        node->range_prev->range_next = node;
+                                }
+                                else {
+                                        f->range_head = node;
+                                }
+                                node->range_next = n;
+                                n->range_prev = node;
+                                break;
+                        }
+                        ASSERT(else if (n->data_offset + n->data_size >
+                                        node->data_offset) {
+                                printk(KERN_ERR "jffs_insert_data(): "
+                                       "Couldn't find a place to insert "
+                                       "the data!\n");
+                                return -1;
+                        });
+                }
+
+                /* Adjust later nodes' offsets etc.  */
+                n = node->range_next;
+                while (n) {
+                        n->data_offset += node->data_size;
+                        n = n->range_next;
+                }
+                f->size += node->data_size;
+        }
+        else if (node->data_offset > f->size) {
+                /* Okay.  This is tricky.  This means that we want to insert
+                   data at a place that is beyond the limits of the file as
+                   it is constructed right now.  This is actually a common
+                   event that for instance could occur during the mounting
+                   of the file system if a large file have been truncated,
+                   rewritten and then only partially garbage collected.  */
+
+                struct jffs_node *n;
+
+                /* We need a place holder for the data that is missing in
+                   front of this insertion.  This "virtual node" will not
+                   be associated with any space on the flash device.  */
+                struct jffs_node *virtual_node;
+                if (!(virtual_node = jffs_alloc_node())) {
+                        return -ENOMEM;
+                }
+
+                D(printk("jffs_insert_data: Inserting a virtual node.\n"));
+                D(printk("  node->data_offset = %u\n", node->data_offset));
+                D(printk("  f->size = %u\n", f->size));
+
+                virtual_node->ino = node->ino;
+                virtual_node->version = node->version;
+                virtual_node->removed_size = 0;
+                virtual_node->fm_offset = 0;
+                virtual_node->name_size = 0;
+                virtual_node->fm = NULL; /* This is a virtual data holder.  */
+                virtual_node->version_prev = NULL;
+                virtual_node->version_next = NULL;
+                virtual_node->range_next = NULL;
+
+                /* Are there any data at all in the file yet?  */
+                if (f->range_head) {
+                        virtual_node->data_offset
+                        = f->range_tail->data_offset
+                          + f->range_tail->data_size;
+                        virtual_node->data_size
+                        = node->data_offset - virtual_node->data_offset;
+                        virtual_node->range_prev = f->range_tail;
+                        f->range_tail->range_next = virtual_node;
+                }
+                else {
+                        virtual_node->data_offset = 0;
+                        virtual_node->data_size = node->data_offset;
+                        virtual_node->range_prev = NULL;
+                        f->range_head = virtual_node;
+                }
+
+                f->range_tail = virtual_node;
+                f->size += virtual_node->data_size;
+
+                /* Insert this virtual node in the version list as well.  */
+                for (n = f->version_head; n ; n = n->version_next) {
+                        if (n->version == virtual_node->version) {
+                                virtual_node->version_prev = n->version_prev;
+                                n->version_prev = virtual_node;
+                                if (virtual_node->version_prev) {
+                                        virtual_node->version_prev
+                                        ->version_next = virtual_node;
+                                }
+                                else {
+                                        f->version_head = virtual_node;
+                                }
+                                virtual_node->version_next = n;
+                                break;
+                        }
+                }
+
+                D(jffs_print_node(virtual_node));
+
+                /* Make a new try to insert the node.  */
+                goto retry;
+        }
+
+        D3(printk("jffs_insert_data(): f->size = %d\n", f->size));
+        return 0;
+}
+
+
+/* A new node (with data) has been added to the file and now the range
+   list has to be modified.  */
+static int
+jffs_update_file(struct jffs_file *f, struct jffs_node *node)
+{
+        int err;
+
+        D3(printk("jffs_update_file(): ino: %u, version: %u\n",
+                  f->ino, node->version));
+
+        if (node->data_size == 0) {
+                if (node->removed_size == 0) {
+                        /* data_offset == X  */
+                        /* data_size == 0  */
+                        /* remove_size == 0  */
+                }
+                else {
+                        /* data_offset == X  */
+                        /* data_size == 0  */
+                        /* remove_size != 0  */
+                        if ((err = jffs_delete_data(f, node)) < 0) {
+                                return err;
+                        }
+                }
+        }
+        else {
+                /* data_offset == X  */
+                /* data_size != 0  */
+                /* remove_size == Y  */
+                if ((err = jffs_delete_data(f, node)) < 0) {
+                        return err;
+                }
+                if ((err = jffs_insert_data(f, node)) < 0) {
+                        return err;
+                }
+        }
+        return 0;
+}
+
+/* Print the contents of a node.  */
+void
+jffs_print_node(struct jffs_node *n)
+{
+        D(printk("jffs_node: 0x%p\n", n));
+        D(printk("{\n"));
+        D(printk("        0x%08x, /* version  */\n", n->version));
+        D(printk("        0x%08x, /* data_offset  */\n", n->data_offset));
+        D(printk("        0x%08x, /* data_size  */\n", n->data_size));
+        D(printk("        0x%08x, /* removed_size  */\n", n->removed_size));
+        D(printk("        0x%08x, /* fm_offset  */\n", n->fm_offset));
+        D(printk("        0x%02x,       /* name_size  */\n", n->name_size));
+        D(printk("        0x%p, /* fm,  fm->offset: %u  */\n",
+                 n->fm, (n->fm ? n->fm->offset : 0)));
+        D(printk("        0x%p, /* version_prev  */\n", n->version_prev));
+        D(printk("        0x%p, /* version_next  */\n", n->version_next));
+        D(printk("        0x%p, /* range_prev  */\n", n->range_prev));
+        D(printk("        0x%p, /* range_next  */\n", n->range_next));
+        D(printk("}\n"));
+}
+
+
+/* Print the contents of a raw inode.  */
+void
+jffs_print_raw_inode(struct jffs_raw_inode *raw_inode)
+{
+        D(printk("jffs_raw_inode: inode number: %u\n", raw_inode->ino));
+        D(printk("{\n"));
+        D(printk("        0x%08x, /* magic  */\n", raw_inode->magic));
+        D(printk("        0x%08x, /* ino  */\n", raw_inode->ino));
+        D(printk("        0x%08x, /* pino  */\n", raw_inode->pino));
+        D(printk("        0x%08x, /* version  */\n", raw_inode->version));
+        D(printk("        0x%08x, /* mode  */\n", raw_inode->mode));
+        D(printk("        0x%04x,     /* uid  */\n", raw_inode->uid));
+        D(printk("        0x%04x,     /* gid  */\n", raw_inode->gid));
+        D(printk("        0x%08x, /* atime  */\n", raw_inode->atime));
+        D(printk("        0x%08x, /* mtime  */\n", raw_inode->mtime));
+        D(printk("        0x%08x, /* ctime  */\n", raw_inode->ctime));
+        D(printk("        0x%08x, /* offset  */\n", raw_inode->offset));
+        D(printk("        0x%08x, /* dsize  */\n", raw_inode->dsize));
+        D(printk("        0x%08x, /* rsize  */\n", raw_inode->rsize));
+        D(printk("        0x%02x,       /* nsize  */\n", raw_inode->nsize));
+        D(printk("        0x%02x,       /* nlink  */\n", raw_inode->nlink));
+        D(printk("        0x%02x,       /* spare  */\n",
+                 raw_inode->spare));
+        D(printk("        %u,          /* rename  */\n",
+                 raw_inode->rename));
+        D(printk("        %u,          /* deleted  */\n",
+                 raw_inode->deleted));
+        D(printk("        0x%02x,       /* accurate  */\n",
+                 raw_inode->accurate));
+        D(printk("        0x%08x, /* dchksum  */\n", raw_inode->dchksum));
+        D(printk("        0x%04x,     /* nchksum  */\n", raw_inode->nchksum));
+        D(printk("        0x%04x,     /* chksum  */\n", raw_inode->chksum));
+        D(printk("}\n"));
+}
+
+
+/* Print the contents of a file.  */
+#if 0
+int
+jffs_print_file(struct jffs_file *f)
+{
+        D(int i);
+        D(printk("jffs_file: 0x%p\n", f));
+        D(printk("{\n"));
+        D(printk("        0x%08x, /* ino  */\n", f->ino));
+        D(printk("        0x%08x, /* pino  */\n", f->pino));
+        D(printk("        0x%08x, /* mode  */\n", f->mode));
+        D(printk("        0x%04x,     /* uid  */\n", f->uid));
+        D(printk("        0x%04x,     /* gid  */\n", f->gid));
+        D(printk("        0x%08x, /* atime  */\n", f->atime));
+        D(printk("        0x%08x, /* mtime  */\n", f->mtime));
+        D(printk("        0x%08x, /* ctime  */\n", f->ctime));
+        D(printk("        0x%02x,       /* nsize  */\n", f->nsize));
+        D(printk("        0x%02x,       /* nlink  */\n", f->nlink));
+        D(printk("        0x%02x,       /* deleted  */\n", f->deleted));
+        D(printk("        \"%s\", ", (f->name ? f->name : "")));
+        D(for (i = strlen(f->name ? f->name : ""); i < 8; ++i) {
+                printk(" ");
+        });
+        D(printk("/* name  */\n"));
+        D(printk("        0x%08x, /* size  */\n", f->size));
+        D(printk("        0x%08x, /* highest_version  */\n",
+                 f->highest_version));
+        D(printk("        0x%p, /* c  */\n", f->c));
+        D(printk("        0x%p, /* parent  */\n", f->parent));
+        D(printk("        0x%p, /* children  */\n", f->children));
+        D(printk("        0x%p, /* sibling_prev  */\n", f->sibling_prev));
+        D(printk("        0x%p, /* sibling_next  */\n", f->sibling_next));
+        D(printk("        0x%p, /* hash_prev  */\n", f->hash.prev));
+        D(printk("        0x%p, /* hash_next  */\n", f->hash.next));
+        D(printk("        0x%p, /* range_head  */\n", f->range_head));
+        D(printk("        0x%p, /* range_tail  */\n", f->range_tail));
+        D(printk("        0x%p, /* version_head  */\n", f->version_head));
+        D(printk("        0x%p, /* version_tail  */\n", f->version_tail));
+        D(printk("}\n"));
+        return 0;
+}
+#endif  /*  0  */
+
+void
+jffs_print_hash_table(struct jffs_control *c)
+{
+        int i;
+
+        printk("JFFS: Dumping the file system's hash table...\n");
+        for (i = 0; i < c->hash_len; i++) {
+                struct list_head *p;
+                for (p = c->hash[i].next; p != &c->hash[i]; p = p->next) {
+                        struct jffs_file *f=list_entry(p,struct jffs_file,hash);
+                        printk("*** c->hash[%u]: \"%s\" "
+                               "(ino: %u, pino: %u)\n",
+                               i, (f->name ? f->name : ""),
+                               f->ino, f->pino);
+                }
+        }
+}
+
+
+void
+jffs_print_tree(struct jffs_file *first_file, int indent)
+{
+        struct jffs_file *f;
+        char *space;
+        int dir;
+
+        if (!first_file) {
+                return;
+        }
+
+        if (!(space = (char *) kmalloc(indent + 1, GFP_KERNEL))) {
+                printk("jffs_print_tree(): Out of memory!\n");
+                return;
+        }
+
+        memset(space, ' ', indent);
+        space[indent] = '\0';
+
+        for (f = first_file; f; f = f->sibling_next) {
+                dir = S_ISDIR(f->mode);
+                printk("%s%s%s (ino: %u, highest_version: %u, size: %u)\n",
+                       space, (f->name ? f->name : ""), (dir ? "/" : ""),
+                       f->ino, f->highest_version, f->size);
+                if (dir) {
+                        jffs_print_tree(f->children, indent + 2);
+                }
+        }
+
+        kfree(space);
+}
+
+
+#if defined(JFFS_MEMORY_DEBUG) && JFFS_MEMORY_DEBUG
+void
+jffs_print_memory_allocation_statistics(void)
+{
+        static long printout;
+        printk("________ Memory printout #%ld ________\n", ++printout);
+        printk("no_jffs_file = %ld\n", no_jffs_file);
+        printk("no_jffs_node = %ld\n", no_jffs_node);
+        printk("no_jffs_control = %ld\n", no_jffs_control);
+        printk("no_jffs_raw_inode = %ld\n", no_jffs_raw_inode);
+        printk("no_jffs_node_ref = %ld\n", no_jffs_node_ref);
+        printk("no_jffs_fm = %ld\n", no_jffs_fm);
+        printk("no_jffs_fmcontrol = %ld\n", no_jffs_fmcontrol);
+        printk("no_hash = %ld\n", no_hash);
+        printk("no_name = %ld\n", no_name);
+        printk("\n");
+}
+#endif
+
+
+/* Rewrite `size' bytes, and begin at `node'.  */
+static int
+jffs_rewrite_data(struct jffs_file *f, struct jffs_node *node, __u32 size)
+{
+        struct jffs_control *c = f->c;
+        struct jffs_fmcontrol *fmc = c->fmc;
+        struct jffs_raw_inode raw_inode;
+        struct jffs_node *new_node;
+        struct jffs_fm *fm;
+        __u32 pos;
+        __u32 pos_dchksum;
+        __u32 total_name_size;
+        __u32 total_data_size;
+        __u32 total_size;
+        int err;
+
+        D1(printk("***jffs_rewrite_data(): node: %u, name: \"%s\", size: %u\n",
+                  f->ino, (f->name ? f->name : "(null)"), size));
+
+        /* Create and initialize the new node.  */
+        if (!(new_node = jffs_alloc_node())) {
+                D(printk("jffs_rewrite_data(): "
+                         "Failed to allocate node.\n"));
+                return -ENOMEM;
+        }
+        DJM(no_jffs_node++);
+        new_node->data_offset = node->data_offset;
+        new_node->removed_size = size;
+        total_name_size = JFFS_PAD(f->nsize);
+        total_data_size = JFFS_PAD(size);
+        total_size = sizeof(struct jffs_raw_inode)
+                     + total_name_size + total_data_size;
+        new_node->fm_offset = sizeof(struct jffs_raw_inode)
+                              + total_name_size;
+
+retry:
+        jffs_fm_write_lock(fmc);
+        err = 0;
+
+        if ((err = jffs_fmalloc(fmc, total_size, new_node, &fm)) < 0) {
+                DJM(no_jffs_node--);
+                jffs_fm_write_unlock(fmc);
+                D(printk("jffs_rewrite_data(): Failed to allocate fm.\n"));
+                jffs_free_node(new_node);
+                return err;
+        }
+        else if (!fm->nodes) {
+                /* The jffs_fm struct that we got is not big enough.  */
+                /* This should never happen, because we deal with this case
+                   in jffs_garbage_collect_next().*/
+                printk(KERN_WARNING "jffs_rewrite_data(): Allocated node is too small (%d bytes of %d)\n", fm->size, total_size);
+                if ((err = jffs_write_dummy_node(c, fm)) < 0) {
+                        D(printk("jffs_rewrite_data(): "
+                                 "jffs_write_dummy_node() Failed!\n"));
+                } else {
+                        err = -ENOSPC;
+                }
+                DJM(no_jffs_fm--);
+                jffs_fm_write_unlock(fmc);
+                kfree(fm);
+                
+                return err;
+        }
+        new_node->fm = fm;
+
+        /* Initialize the raw inode.  */
+        raw_inode.magic = JFFS_MAGIC_BITMASK;
+        raw_inode.ino = f->ino;
+        raw_inode.pino = f->pino;
+        raw_inode.version = f->highest_version + 1;
+        raw_inode.mode = f->mode;
+        raw_inode.uid = f->uid;
+        raw_inode.gid = f->gid;
+        raw_inode.atime = f->atime;
+        raw_inode.mtime = f->mtime;
+        raw_inode.ctime = f->ctime;
+        raw_inode.offset = node->data_offset;
+        raw_inode.dsize = size;
+        raw_inode.rsize = size;
+        raw_inode.nsize = f->nsize;
+        raw_inode.nlink = f->nlink;
+        raw_inode.spare = 0;
+        raw_inode.rename = 0;
+        raw_inode.deleted = f->deleted;
+        raw_inode.accurate = 0xff;
+        raw_inode.dchksum = 0;
+        raw_inode.nchksum = 0;
+
+        pos = new_node->fm->offset;
+        pos_dchksum = pos +JFFS_RAW_INODE_DCHKSUM_OFFSET;
+
+        D3(printk("jffs_rewrite_data(): Writing this raw inode "
+                  "to pos 0x%ul.\n", pos));
+        D3(jffs_print_raw_inode(&raw_inode));
+
+        if ((err = flash_safe_write(fmc->mtd, pos,
+                                    (u_char *) &raw_inode,
+                                    sizeof(struct jffs_raw_inode)
+                                    - sizeof(__u32)
+                                    - sizeof(__u16) - sizeof(__u16))) < 0) {
+                jffs_fmfree_partly(fmc, fm,
+                                   total_name_size + total_data_size);
+                jffs_fm_write_unlock(fmc);
+                printk(KERN_ERR "JFFS: jffs_rewrite_data: Write error during "
+                        "rewrite. (raw inode)\n");
+                printk(KERN_ERR "JFFS: jffs_rewrite_data: Now retrying "
+                        "rewrite. (raw inode)\n");
+                goto retry;
+        }
+        pos += sizeof(struct jffs_raw_inode);
+
+        /* Write the name to the flash memory.  */
+        if (f->nsize) {
+                D3(printk("jffs_rewrite_data(): Writing name \"%s\" to "
+                          "pos 0x%ul.\n", f->name, (unsigned int) pos));
+                if ((err = flash_safe_write(fmc->mtd, pos,
+                                            (u_char *)f->name,
+                                            f->nsize)) < 0) {
+                        jffs_fmfree_partly(fmc, fm, total_data_size);
+                        jffs_fm_write_unlock(fmc);
+                        printk(KERN_ERR "JFFS: jffs_rewrite_data: Write "
+                                "error during rewrite. (name)\n");
+                        printk(KERN_ERR "JFFS: jffs_rewrite_data: Now retrying "
+                                "rewrite. (name)\n");
+                        goto retry;
+                }
+                pos += total_name_size;
+                raw_inode.nchksum = jffs_checksum(f->name, f->nsize);
+        }
+
+        /* Write the data.  */
+        if (size) {
+                int r;
+                unsigned char *page;
+                __u32 offset = node->data_offset;
+
+                if (!(page = (unsigned char *)__get_free_page(GFP_KERNEL))) {
+                        jffs_fmfree_partly(fmc, fm, 0);
+                        return -1;
+                }
+
+                while (size) {
+                        __u32 s = min(size, (__u32)PAGE_SIZE);
+                        if ((r = jffs_read_data(f, (char *)page,
+                                                offset, s)) < s) {
+                                free_page((unsigned long)page);
+                                jffs_fmfree_partly(fmc, fm, 0);
+                                jffs_fm_write_unlock(fmc);
+                                printk(KERN_ERR "JFFS: jffs_rewrite_data: "
+                                         "jffs_read_data() "
+                                         "failed! (r = %d)\n", r);
+                                return -1;
+                        }
+                        if ((err = flash_safe_write(fmc->mtd,
+                                                    pos, page, r)) < 0) {
+                                free_page((unsigned long)page);
+                                jffs_fmfree_partly(fmc, fm, 0);
+                                jffs_fm_write_unlock(fmc);
+                                printk(KERN_ERR "JFFS: jffs_rewrite_data: "
+                                       "Write error during rewrite. "
+                                       "(data)\n");
+                                goto retry;
+                        }
+                        pos += r;
+                        size -= r;
+                        offset += r;
+                        raw_inode.dchksum += jffs_checksum(page, r);
+                }
+
+                free_page((unsigned long)page);
+        }
+
+        raw_inode.accurate = 0;
+        raw_inode.chksum = jffs_checksum(&raw_inode,
+                                         sizeof(struct jffs_raw_inode)
+                                         - sizeof(__u16));
+
+        /* Add the checksum.  */
+        if ((err
+             = flash_safe_write(fmc->mtd, pos_dchksum,
+                                &((u_char *)
+                                &raw_inode)[JFFS_RAW_INODE_DCHKSUM_OFFSET],
+                                sizeof(__u32) + sizeof(__u16)
+                                + sizeof(__u16))) < 0) {
+                jffs_fmfree_partly(fmc, fm, 0);
+                jffs_fm_write_unlock(fmc);
+                printk(KERN_ERR "JFFS: jffs_rewrite_data: Write error during "
+                       "rewrite. (checksum)\n");
+                goto retry;
+        }
+
+        /* Now make the file system aware of the newly written node.  */
+        jffs_insert_node(c, f, &raw_inode, f->name, new_node);
+        jffs_fm_write_unlock(fmc);
+
+        D3(printk("jffs_rewrite_data(): Leaving...\n"));
+        return 0;
+} /* jffs_rewrite_data()  */
+
+
+/* jffs_garbage_collect_next implements one step in the garbage collect
+   process and is often called multiple times at each occasion of a
+   garbage collect.  */
+
+static int
+jffs_garbage_collect_next(struct jffs_control *c)
+{
+        struct jffs_fmcontrol *fmc = c->fmc;
+        struct jffs_node *node;
+        struct jffs_file *f;
+        int err = 0;
+        __u32 size;
+        __u32 data_size;
+        __u32 total_name_size;
+        __u32 extra_available;
+        __u32 space_needed;
+        __u32 free_chunk_size1 = jffs_free_size1(fmc);
+        D2(__u32 free_chunk_size2 = jffs_free_size2(fmc));
+
+        /* Get the oldest node in the flash.  */
+        node = jffs_get_oldest_node(fmc);
+        ASSERT(if (!node) {
+                printk(KERN_ERR "JFFS: jffs_garbage_collect_next: "
+                       "No oldest node found!\n");
+                err = -1;
+                goto jffs_garbage_collect_next_end;
+                
+
+        });
+
+        /* Find its corresponding file too.  */
+        f = jffs_find_file(c, node->ino);
+
+        if (!f) {
+          printk (KERN_ERR "JFFS: jffs_garbage_collect_next: "
+                  "No file to garbage collect! "
+                  "(ino = 0x%08x)\n", node->ino);
+          /* FIXME: Free the offending node and recover. */
+          err = -1;
+          goto jffs_garbage_collect_next_end;
+        }
+
+        /* We always write out the name. Theoretically, we don't need
+           to, but for now it's easier - because otherwise we'd have
+           to keep track of how many times the current name exists on
+           the flash and make sure it never reaches zero.
+
+           The current approach means that would be possible to cause
+           the GC to end up eating its tail by writing lots of nodes
+           with no name for it to garbage-collect. Hence the change in
+           inode.c to write names with _every_ node.
+
+           It sucks, but it _should_ work.
+        */
+        total_name_size = JFFS_PAD(f->nsize);
+
+        D1(printk("jffs_garbage_collect_next(): \"%s\", "
+                  "ino: %u, version: %u, location 0x%x, dsize %u\n",
+                  (f->name ? f->name : ""), node->ino, node->version, 
+                  node->fm->offset, node->data_size));
+
+        /* Compute how many data it's possible to rewrite at the moment.  */
+        data_size = f->size - node->data_offset;
+
+        /* And from that, the total size of the chunk we want to write */
+        size = sizeof(struct jffs_raw_inode) + total_name_size
+               + data_size + JFFS_GET_PAD_BYTES(data_size);
+
+        /* If that's more than max_chunk_size, reduce it accordingly */
+        if (size > fmc->max_chunk_size) {
+                size = fmc->max_chunk_size;
+                data_size = size - sizeof(struct jffs_raw_inode)
+                            - total_name_size;
+        }
+
+        /* If we're asking to take up more space than free_chunk_size1
+           but we _could_ fit in it, shrink accordingly.
+        */
+        if (size > free_chunk_size1) {
+
+                if (free_chunk_size1 <
+                    (sizeof(struct jffs_raw_inode) + total_name_size + BLOCK_SIZE)){
+                        /* The space left is too small to be of any
+                           use really.  */
+                        struct jffs_fm *dirty_fm
+                        = jffs_fmalloced(fmc,
+                                         fmc->tail->offset + fmc->tail->size,
+                                         free_chunk_size1, NULL);
+                        if (!dirty_fm) {
+                                printk(KERN_ERR "JFFS: "
+                                       "jffs_garbage_collect_next: "
+                                       "Failed to allocate `dirty' "
+                                       "flash memory!\n");
+                                err = -1;
+                                goto jffs_garbage_collect_next_end;
+                        }
+                        D1(printk("Dirtying end of flash - too small\n"));
+                        jffs_write_dummy_node(c, dirty_fm);
+                        err = 0;
+                        goto jffs_garbage_collect_next_end;
+                }
+                D1(printk("Reducing size of new node from %d to %d to avoid "
+                          " exceeding free_chunk_size1\n",
+                          size, free_chunk_size1));
+
+                size = free_chunk_size1;
+                data_size = size - sizeof(struct jffs_raw_inode)
+                            - total_name_size;
+        }
+
+
+        /* Calculate the amount of space needed to hold the nodes
+           which are remaining in the tail */
+        space_needed = fmc->min_free_size - (node->fm->offset % fmc->sector_size);
+
+        /* From that, calculate how much 'extra' space we can use to
+           increase the size of the node we're writing from the size
+           of the node we're obsoleting
+        */
+        if (space_needed > fmc->free_size) {
+                /* If we've gone below min_free_size for some reason,
+                   don't fuck up. This is why we have 
+                   min_free_size > sector_size. Whinge about it though,
+                   just so I can convince myself my maths is right.
+                */
+                D1(printk(KERN_WARNING "jffs_garbage_collect_next(): "
+                          "space_needed %d exceeded free_size %d\n",
+                          space_needed, fmc->free_size));
+                extra_available = 0;
+        } else {
+                extra_available = fmc->free_size - space_needed;
+        }
+
+        /* Check that we don't use up any more 'extra' space than
+           what's available */
+        if (size > JFFS_PAD(node->data_size) + total_name_size + 
+            sizeof(struct jffs_raw_inode) + extra_available) {
+                D1(printk("Reducing size of new node from %d to %ld to avoid "
+                       "catching our tail\n", size, 
+                          (long) (JFFS_PAD(node->data_size) + JFFS_PAD(node->name_size) + 
+                          sizeof(struct jffs_raw_inode) + extra_available)));
+                D1(printk("space_needed = %d, extra_available = %d\n", 
+                          space_needed, extra_available));
+
+                size = JFFS_PAD(node->data_size) + total_name_size + 
+                  sizeof(struct jffs_raw_inode) + extra_available;
+                data_size = size - sizeof(struct jffs_raw_inode)
+                        - total_name_size;
+        };
+
+        D2(printk("  total_name_size: %u\n", total_name_size));
+        D2(printk("  data_size: %u\n", data_size));
+        D2(printk("  size: %u\n", size));
+        D2(printk("  f->nsize: %u\n", f->nsize));
+        D2(printk("  f->size: %u\n", f->size));
+        D2(printk("  node->data_offset: %u\n", node->data_offset));
+        D2(printk("  free_chunk_size1: %u\n", free_chunk_size1));
+        D2(printk("  free_chunk_size2: %u\n", free_chunk_size2));
+        D2(printk("  node->fm->offset: 0x%08x\n", node->fm->offset));
+
+        if ((err = jffs_rewrite_data(f, node, data_size))) {
+                printk(KERN_WARNING "jffs_rewrite_data() failed: %d\n", err);
+                return err;
+        }
+          
+jffs_garbage_collect_next_end:
+        D3(printk("jffs_garbage_collect_next: Leaving...\n"));
+        return err;
+} /* jffs_garbage_collect_next */
+
+
+/* If an obsolete node is partly going to be erased due to garbage
+   collection, the part that isn't going to be erased must be filled
+   with zeroes so that the scan of the flash will work smoothly next
+   time.  (The data in the file could for instance be a JFFS image
+   which could cause enormous confusion during a scan of the flash
+   device if we didn't do this.)
+     There are two phases in this procedure: First, the clearing of
+   the name and data parts of the node. Second, possibly also clearing
+   a part of the raw inode as well.  If the box is power cycled during
+   the first phase, only the checksum of this node-to-be-cleared-at-
+   the-end will be wrong.  If the box is power cycled during, or after,
+   the clearing of the raw inode, the information like the length of
+   the name and data parts are zeroed.  The next time the box is
+   powered up, the scanning algorithm manages this faulty data too
+   because:
+
+   - The checksum is invalid and thus the raw inode must be discarded
+     in any case.
+   - If the lengths of the data part or the name part are zeroed, the
+     scanning just continues after the raw inode.  But after the inode
+     the scanning procedure just finds zeroes which is the same as
+     dirt.
+
+   So, in the end, this could never fail. :-)  Even if it does fail,
+   the scanning algorithm should manage that too.  */
+
+static int
+jffs_clear_end_of_node(struct jffs_control *c, __u32 erase_size)
+{
+        struct jffs_fm *fm;
+        struct jffs_fmcontrol *fmc = c->fmc;
+        __u32 zero_offset;
+        __u32 zero_size;
+        __u32 zero_offset_data;
+        __u32 zero_size_data;
+        __u32 cutting_raw_inode = 0;
+
+        if (!(fm = jffs_cut_node(fmc, erase_size))) {
+                D3(printk("jffs_clear_end_of_node(): fm == NULL\n"));
+                return 0;
+        }
+
+        /* Where and how much shall we clear?  */
+        zero_offset = fmc->head->offset + erase_size;
+        zero_size = fm->offset + fm->size - zero_offset;
+
+        /* Do we have to clear the raw_inode explicitly?  */
+        if (fm->size - zero_size < sizeof(struct jffs_raw_inode)) {
+                cutting_raw_inode = sizeof(struct jffs_raw_inode)
+                                    - (fm->size - zero_size);
+        }
+
+        /* First, clear the name and data fields.  */
+        zero_offset_data = zero_offset + cutting_raw_inode;
+        zero_size_data = zero_size - cutting_raw_inode;
+        flash_safe_acquire(fmc->mtd);
+        flash_memset(fmc->mtd, zero_offset_data, 0, zero_size_data);
+        flash_safe_release(fmc->mtd);
+
+        /* Should we clear a part of the raw inode?  */
+        if (cutting_raw_inode) {
+                /* I guess it is ok to clear the raw inode in this order.  */
+                flash_safe_acquire(fmc->mtd);
+                flash_memset(fmc->mtd, zero_offset, 0,
+                             cutting_raw_inode);
+                flash_safe_release(fmc->mtd);
+        }
+
+        return 0;
+} /* jffs_clear_end_of_node()  */
+
+/* Try to erase as much as possible of the dirt in the flash memory.  */
+static long
+jffs_try_to_erase(struct jffs_control *c)
+{
+        struct jffs_fmcontrol *fmc = c->fmc;
+        long erase_size;
+        int err;
+        __u32 offset;
+
+        D3(printk("jffs_try_to_erase()\n"));
+
+        erase_size = jffs_erasable_size(fmc);
+
+        D2(printk("jffs_try_to_erase(): erase_size = %ld\n", erase_size));
+
+        if (erase_size == 0) {
+                return 0;
+        }
+        else if (erase_size < 0) {
+                printk(KERN_ERR "JFFS: jffs_try_to_erase: "
+                       "jffs_erasable_size returned %ld.\n", erase_size);
+                return erase_size;
+        }
+
+        if ((err = jffs_clear_end_of_node(c, erase_size)) < 0) {
+                printk(KERN_ERR "JFFS: jffs_try_to_erase: "
+                       "Clearing of node failed.\n");
+                return err;
+        }
+
+        offset = fmc->head->offset;
+
+        /* Now, let's try to do the erase.  */
+        if ((err = flash_erase_region(fmc->mtd,
+                                      offset, erase_size)) < 0) {
+                printk(KERN_ERR "JFFS: Erase of flash failed. "
+                       "offset = %u, erase_size = %ld\n",
+                       offset, erase_size);
+                /* XXX: Here we should allocate this area as dirty
+                   with jffs_fmalloced or something similar.  Now
+                   we just report the error.  */
+                return err;
+        }
+
+#if 0
+        /* Check if the erased sectors really got erased.  */
+        {
+                __u32 pos;
+                __u32 end;
+
+                pos = (__u32)flash_get_direct_pointer(to_kdev_t(c->sb->s_dev), offset);
+                end = pos + erase_size;
+
+                D2(printk("JFFS: Checking erased sector(s)...\n"));
+
+                flash_safe_acquire(fmc->mtd);
+
+                for (; pos < end; pos += 4) {
+                        if (*(__u32 *)pos != JFFS_EMPTY_BITMASK) {
+                                printk("JFFS: Erase failed! pos = 0x%lx\n",
+                                       (long)pos);
+                                jffs_hexdump(fmc->mtd, pos,
+                                             jffs_min(256, end - pos));
+                                err = -1;
+                                break;
+                        }
+                }
+
+                flash_safe_release(fmc->mtd);
+
+                if (!err) {
+                        D2(printk("JFFS: Erase succeeded.\n"));
+                }
+                else {
+                        /* XXX: Here we should allocate the memory
+                           with jffs_fmalloced() in order to prevent
+                           JFFS from using this area accidentally.  */
+                        return err;
+                }
+        }
+#endif
+
+        /* Update the flash memory data structures.  */
+        jffs_sync_erase(fmc, erase_size);
+
+        return erase_size;
+}
+
+
+/* There are different criteria that should trigger a garbage collect:
+
+   1. There is too much dirt in the memory.
+   2. The free space is becoming small.
+   3. There are many versions of a node.
+
+   The garbage collect should always be done in a manner that guarantees
+   that future garbage collects cannot be locked.  E.g. Rewritten chunks
+   should not be too large (span more than one sector in the flash memory
+   for exemple).  Of course there is a limit on how intelligent this garbage
+   collection can be.  */
+
+
+static int
+jffs_garbage_collect_now(struct jffs_control *c)
+{
+        struct jffs_fmcontrol *fmc = c->fmc;
+        long erased = 0;
+        int result = 0;
+        D1(int i = 1);
+        D2(printk("***jffs_garbage_collect_now(): fmc->dirty_size = %u, fmc->free_size = 0x%x\n, fcs1=0x%x, fcs2=0x%x",
+                  fmc->dirty_size, fmc->free_size, jffs_free_size1(fmc), jffs_free_size2(fmc)));
+        D2(jffs_print_fmcontrol(fmc));
+
+        //      down(&fmc->gclock);
+
+        /* If it is possible to garbage collect, do so.  */
+        
+        while (erased == 0) {
+                D1(printk("***jffs_garbage_collect_now(): round #%u, "
+                          "fmc->dirty_size = %u\n", i++, fmc->dirty_size));
+                D2(jffs_print_fmcontrol(fmc));
+
+                if ((erased = jffs_try_to_erase(c)) < 0) {
+                        printk(KERN_WARNING "JFFS: Error in "
+                               "garbage collector.\n");
+                        result = erased;
+                        goto gc_end;
+                }
+                if (erased)
+                        break;
+                
+                if (fmc->free_size == 0) {
+                        /* Argh */
+                        printk(KERN_ERR "jffs_garbage_collect_now(): free_size == 0. This is BAD.\n");
+                        result = -ENOSPC;
+                        break;
+                }
+
+                if (fmc->dirty_size < fmc->sector_size) {
+                        /* Actually, we _may_ have been able to free some, 
+                         * if there are many overlapping nodes which aren't
+                         * actually marked dirty because they still have
+                         * some valid data in each.
+                         */
+                        result = -ENOSPC;
+                        break;
+                }
+
+                /* Let's dare to make a garbage collect.  */
+                if ((result = jffs_garbage_collect_next(c)) < 0) {
+                        printk(KERN_ERR "JFFS: Something "
+                               "has gone seriously wrong "
+                               "with a garbage collect.\n");
+                        goto gc_end;
+                }
+
+                D1(printk("   jffs_garbage_collect_now(): erased: %ld\n", erased));
+                DJM(jffs_print_memory_allocation_statistics());
+        }
+        
+gc_end:
+        //      up(&fmc->gclock);
+
+        D3(printk("   jffs_garbage_collect_now(): Leaving...\n"));
+        D1(if (erased) {
+                printk("jffs_g_c_now(): erased = %ld\n", erased);
+                jffs_print_fmcontrol(fmc);
+        });
+
+        if (!erased && !result)
+                return -ENOSPC;
+
+        return result;
+} /* jffs_garbage_collect_now() */
+
+
+/* Determine if it is reasonable to start garbage collection.
+   We start a gc pass if either:
+   - The number of free bytes < MIN_FREE_BYTES && at least one
+     block is dirty, OR
+   - The number of dirty bytes > MAX_DIRTY_BYTES
+*/
+static inline int thread_should_wake (struct jffs_control *c)
+{
+        D1(printk (KERN_NOTICE "thread_should_wake(): free=%d, dirty=%d, blocksize=%d.\n",
+                   c->fmc->free_size, c->fmc->dirty_size, c->fmc->sector_size));
+
+        /* If there's not enough dirty space to free a block, there's no point. */
+        if (c->fmc->dirty_size < c->fmc->sector_size) {
+                D2(printk(KERN_NOTICE "thread_should_wake(): Not waking. Insufficient dirty space\n"));
+                return 0;
+        }
+#if 1
+        /* If there is too much RAM used by the various structures, GC */
+        if (jffs_get_node_inuse() > (c->fmc->used_size/c->fmc->max_chunk_size * 5 + jffs_get_file_count() * 2 + 50)) {
+                /* FIXME: Provide proof that this test can be satisfied. We
+                   don't want a filesystem doing endless GC just because this
+                   condition cannot ever be false.
+                */
+                D2(printk(KERN_NOTICE "thread_should_wake(): Waking due to number of nodes\n"));
+                return 1;
+        }
+#endif
+        /* If there are fewer free bytes than the threshold, GC */
+        if (c->fmc->free_size < c->gc_minfree_threshold) {
+                D2(printk(KERN_NOTICE "thread_should_wake(): Waking due to insufficent free space\n"));
+                return 1;
+        }
+        /* If there are more dirty bytes than the threshold, GC */
+        if (c->fmc->dirty_size > c->gc_maxdirty_threshold) {
+                D2(printk(KERN_NOTICE "thread_should_wake(): Waking due to excessive dirty space\n"));
+                return 1;
+        }       
+        /* FIXME: What about the "There are many versions of a node" condition? */
+
+        return 0;
+}
+
+
+void jffs_garbage_collect_trigger(struct jffs_control *c)
+{
+        /* NOTE: We rely on the fact that we have the BKL here.
+         * Otherwise, the gc_task could go away between the check
+         * and the wake_up_process()
+         */
+        if (c->gc_task && thread_should_wake(c))
+                send_sig(SIGHUP, c->gc_task, 1);
+}
+  
+
+/* Kernel threads  take (void *) as arguments.   Thus we pass
+   the jffs_control data as a (void *) and then cast it. */
+int
+jffs_garbage_collect_thread(void *ptr)
+{
+        struct jffs_control *c = (struct jffs_control *) ptr;
+        struct jffs_fmcontrol *fmc = c->fmc;
+        long erased;
+        int result = 0;
+        D1(int i = 1);
+
+        daemonize("jffs_gcd");
+
+        c->gc_task = current;
+
+        lock_kernel();
+        init_completion(&c->gc_thread_comp); /* barrier */ 
+        spin_lock_irq(&current->sighand->siglock);
+        siginitsetinv (&current->blocked, sigmask(SIGHUP) | sigmask(SIGKILL) | sigmask(SIGSTOP) | sigmask(SIGCONT));
+        recalc_sigpending();
+        spin_unlock_irq(&current->sighand->siglock);
+
+        D1(printk (KERN_NOTICE "jffs_garbage_collect_thread(): Starting infinite loop.\n"));
+
+        for (;;) {
+
+                /* See if we need to start gc.  If we don't, go to sleep.
+                   
+                   Current implementation is a BAD THING(tm).  If we try 
+                   to unmount the FS, the unmount operation will sleep waiting
+                   for this thread to exit.  We need to arrange to send it a
+                   sig before the umount process sleeps.
+                */
+
+                if (!thread_should_wake(c))
+                        set_current_state (TASK_INTERRUPTIBLE);
+                
+                schedule(); /* Yes, we do this even if we want to go
+                                       on immediately - we're a low priority 
+                                       background task. */
+
+                /* Put_super will send a SIGKILL and then wait on the sem. 
+                 */
+                while (signal_pending(current)) {
+                        siginfo_t info;
+                        unsigned long signr = 0;
+
+                        spin_lock_irq(&current->sighand->siglock);
+                        signr = dequeue_signal(current, &current->blocked, &info);
+                        spin_unlock_irq(&current->sighand->siglock);
+
+                        switch(signr) {
+                        case SIGSTOP:
+                                D1(printk("jffs_garbage_collect_thread(): SIGSTOP received.\n"));
+                                set_current_state(TASK_STOPPED);
+                                schedule();
+                                break;
+
+                        case SIGKILL:
+                                D1(printk("jffs_garbage_collect_thread(): SIGKILL received.\n"));
+                                c->gc_task = NULL;
+                                complete_and_exit(&c->gc_thread_comp, 0);
+                        }
+                }
+
+
+                D1(printk (KERN_NOTICE "jffs_garbage_collect_thread(): collecting.\n"));
+
+                D3(printk (KERN_NOTICE "g_c_thread(): down biglock\n"));
+                down(&fmc->biglock);
+                
+                D1(printk("***jffs_garbage_collect_thread(): round #%u, "
+                          "fmc->dirty_size = %u\n", i++, fmc->dirty_size));
+                D2(jffs_print_fmcontrol(fmc));
+
+                if ((erased = jffs_try_to_erase(c)) < 0) {
+                        printk(KERN_WARNING "JFFS: Error in "
+                               "garbage collector: %ld.\n", erased);
+                }
+
+                if (erased)
+                        goto gc_end;
+
+                if (fmc->free_size == 0) {
+                        /* Argh. Might as well commit suicide. */
+                        printk(KERN_ERR "jffs_garbage_collect_thread(): free_size == 0. This is BAD.\n");
+                        send_sig(SIGQUIT, c->gc_task, 1);
+                        // panic()
+                        goto gc_end;
+                }
+                
+                /* Let's dare to make a garbage collect.  */
+                if ((result = jffs_garbage_collect_next(c)) < 0) {
+                        printk(KERN_ERR "JFFS: Something "
+                               "has gone seriously wrong "
+                               "with a garbage collect: %d\n", result);
+                }
+                
+        gc_end:
+                D3(printk (KERN_NOTICE "g_c_thread(): up biglock\n"));
+                up(&fmc->biglock);
+        } /* for (;;) */
+} /* jffs_garbage_collect_thread() */