Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/fs/jffs/jffs_fm.c b/fs/jffs/jffs_fm.c
new file mode 100644
index 0000000..0cab8da
--- /dev/null
+++ b/fs/jffs/jffs_fm.c
@@ -0,0 +1,795 @@
+/*
+ * JFFS -- Journaling Flash File System, Linux implementation.
+ *
+ * Copyright (C) 1999, 2000 Axis Communications AB.
+ *
+ * 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: jffs_fm.c,v 1.27 2001/09/20 12:29:47 dwmw2 Exp $
+ *
+ * Ported to Linux 2.3.x and MTD:
+ * Copyright (C) 2000 Alexander Larsson (alex@cendio.se), Cendio Systems AB
+ *
+ */
+#include <linux/slab.h>
+#include <linux/blkdev.h>
+#include <linux/jffs.h>
+#include "jffs_fm.h"
+
+#if defined(JFFS_MARK_OBSOLETE) && JFFS_MARK_OBSOLETE
+static int jffs_mark_obsolete(struct jffs_fmcontrol *fmc, __u32 fm_offset);
+#endif
+
+static struct jffs_fm *jffs_alloc_fm(void);
+static void jffs_free_fm(struct jffs_fm *n);
+
+extern kmem_cache_t *fm_cache;
+extern kmem_cache_t *node_cache;
+
+/* This function creates a new shiny flash memory control structure. */
+struct jffs_fmcontrol *
+jffs_build_begin(struct jffs_control *c, int unit)
+{
+ struct jffs_fmcontrol *fmc;
+ struct mtd_info *mtd;
+
+ D3(printk("jffs_build_begin()\n"));
+ fmc = (struct jffs_fmcontrol *)kmalloc(sizeof(struct jffs_fmcontrol),
+ GFP_KERNEL);
+ if (!fmc) {
+ D(printk("jffs_build_begin(): Allocation of "
+ "struct jffs_fmcontrol failed!\n"));
+ return (struct jffs_fmcontrol *)0;
+ }
+ DJM(no_jffs_fmcontrol++);
+
+ mtd = get_mtd_device(NULL, unit);
+
+ if (!mtd) {
+ kfree(fmc);
+ DJM(no_jffs_fmcontrol--);
+ return NULL;
+ }
+
+ /* Retrieve the size of the flash memory. */
+ fmc->flash_size = mtd->size;
+ D3(printk(" fmc->flash_size = %d bytes\n", fmc->flash_size));
+
+ fmc->used_size = 0;
+ fmc->dirty_size = 0;
+ fmc->free_size = mtd->size;
+ fmc->sector_size = mtd->erasesize;
+ fmc->max_chunk_size = fmc->sector_size >> 1;
+ /* min_free_size:
+ 1 sector, obviously.
+ + 1 x max_chunk_size, for when a nodes overlaps the end of a sector
+ + 1 x max_chunk_size again, which ought to be enough to handle
+ the case where a rename causes a name to grow, and GC has
+ to write out larger nodes than the ones it's obsoleting.
+ We should fix it so it doesn't have to write the name
+ _every_ time. Later.
+ + another 2 sectors because people keep getting GC stuck and
+ we don't know why. This scares me - I want formal proof
+ of correctness of whatever number we put here. dwmw2.
+ */
+ fmc->min_free_size = fmc->sector_size << 2;
+ fmc->mtd = mtd;
+ fmc->c = c;
+ fmc->head = NULL;
+ fmc->tail = NULL;
+ fmc->head_extra = NULL;
+ fmc->tail_extra = NULL;
+ init_MUTEX(&fmc->biglock);
+ return fmc;
+}
+
+
+/* When the flash memory scan has completed, this function should be called
+ before use of the control structure. */
+void
+jffs_build_end(struct jffs_fmcontrol *fmc)
+{
+ D3(printk("jffs_build_end()\n"));
+
+ if (!fmc->head) {
+ fmc->head = fmc->head_extra;
+ fmc->tail = fmc->tail_extra;
+ }
+ else if (fmc->head_extra) {
+ fmc->tail_extra->next = fmc->head;
+ fmc->head->prev = fmc->tail_extra;
+ fmc->head = fmc->head_extra;
+ }
+ fmc->head_extra = NULL; /* These two instructions should be omitted. */
+ fmc->tail_extra = NULL;
+ D3(jffs_print_fmcontrol(fmc));
+}
+
+
+/* Call this function when the file system is unmounted. This function
+ frees all memory used by this module. */
+void
+jffs_cleanup_fmcontrol(struct jffs_fmcontrol *fmc)
+{
+ if (fmc) {
+ struct jffs_fm *next = fmc->head;
+ while (next) {
+ struct jffs_fm *cur = next;
+ next = next->next;
+ jffs_free_fm(cur);
+ }
+ put_mtd_device(fmc->mtd);
+ kfree(fmc);
+ DJM(no_jffs_fmcontrol--);
+ }
+}
+
+
+/* This function returns the size of the first chunk of free space on the
+ flash memory. This function will return something nonzero if the flash
+ memory contains any free space. */
+__u32
+jffs_free_size1(struct jffs_fmcontrol *fmc)
+{
+ __u32 head;
+ __u32 tail;
+ __u32 end = fmc->flash_size;
+
+ if (!fmc->head) {
+ /* There is nothing on the flash. */
+ return fmc->flash_size;
+ }
+
+ /* Compute the beginning and ending of the contents of the flash. */
+ head = fmc->head->offset;
+ tail = fmc->tail->offset + fmc->tail->size;
+ if (tail == end) {
+ tail = 0;
+ }
+ ASSERT(else if (tail > end) {
+ printk(KERN_WARNING "jffs_free_size1(): tail > end\n");
+ tail = 0;
+ });
+
+ if (head <= tail) {
+ return end - tail;
+ }
+ else {
+ return head - tail;
+ }
+}
+
+/* This function will return something nonzero in case there are two free
+ areas on the flash. Like this:
+
+ +----------------+------------------+----------------+
+ | FREE 1 | USED / DIRTY | FREE 2 |
+ +----------------+------------------+----------------+
+ fmc->head -----^
+ fmc->tail ------------------------^
+
+ The value returned, will be the size of the first empty area on the
+ flash, in this case marked "FREE 1". */
+__u32
+jffs_free_size2(struct jffs_fmcontrol *fmc)
+{
+ if (fmc->head) {
+ __u32 head = fmc->head->offset;
+ __u32 tail = fmc->tail->offset + fmc->tail->size;
+ if (tail == fmc->flash_size) {
+ tail = 0;
+ }
+
+ if (tail >= head) {
+ return head;
+ }
+ }
+ return 0;
+}
+
+
+/* Allocate a chunk of flash memory. If there is enough space on the
+ device, a reference to the associated node is stored in the jffs_fm
+ struct. */
+int
+jffs_fmalloc(struct jffs_fmcontrol *fmc, __u32 size, struct jffs_node *node,
+ struct jffs_fm **result)
+{
+ struct jffs_fm *fm;
+ __u32 free_chunk_size1;
+ __u32 free_chunk_size2;
+
+ D2(printk("jffs_fmalloc(): fmc = 0x%p, size = %d, "
+ "node = 0x%p\n", fmc, size, node));
+
+ *result = NULL;
+
+ if (!(fm = jffs_alloc_fm())) {
+ D(printk("jffs_fmalloc(): kmalloc() failed! (fm)\n"));
+ return -ENOMEM;
+ }
+
+ 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 "Free size accounting screwed\n");
+ printk(KERN_WARNING "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);
+ }
+
+ D3(printk("jffs_fmalloc(): free_chunk_size1 = %u, "
+ "free_chunk_size2 = %u\n",
+ free_chunk_size1, free_chunk_size2));
+
+ if (size <= free_chunk_size1) {
+ if (!(fm->nodes = (struct jffs_node_ref *)
+ kmalloc(sizeof(struct jffs_node_ref),
+ GFP_KERNEL))) {
+ D(printk("jffs_fmalloc(): kmalloc() failed! "
+ "(node_ref)\n"));
+ jffs_free_fm(fm);
+ return -ENOMEM;
+ }
+ DJM(no_jffs_node_ref++);
+ fm->nodes->node = node;
+ fm->nodes->next = NULL;
+ if (fmc->tail) {
+ fm->offset = fmc->tail->offset + fmc->tail->size;
+ if (fm->offset == fmc->flash_size) {
+ fm->offset = 0;
+ }
+ ASSERT(else if (fm->offset > fmc->flash_size) {
+ printk(KERN_WARNING "jffs_fmalloc(): "
+ "offset > flash_end\n");
+ fm->offset = 0;
+ });
+ }
+ else {
+ /* There don't have to be files in the file
+ system yet. */
+ fm->offset = 0;
+ }
+ fm->size = size;
+ fmc->free_size -= size;
+ fmc->used_size += size;
+ }
+ else if (size > free_chunk_size2) {
+ printk(KERN_WARNING "JFFS: Tried to allocate a too "
+ "large flash memory chunk. (size = %u)\n", size);
+ jffs_free_fm(fm);
+ return -ENOSPC;
+ }
+ else {
+ fm->offset = fmc->tail->offset + fmc->tail->size;
+ fm->size = free_chunk_size1;
+ fm->nodes = NULL;
+ fmc->free_size -= fm->size;
+ fmc->dirty_size += fm->size; /* Changed by simonk. This seemingly fixes a
+ bug that caused infinite garbage collection.
+ It previously set fmc->dirty_size to size (which is the
+ size of the requested chunk).
+ */
+ }
+
+ fm->next = NULL;
+ if (!fmc->head) {
+ fm->prev = NULL;
+ fmc->head = fm;
+ fmc->tail = fm;
+ }
+ else {
+ fm->prev = fmc->tail;
+ fmc->tail->next = fm;
+ fmc->tail = fm;
+ }
+
+ D3(jffs_print_fmcontrol(fmc));
+ D3(jffs_print_fm(fm));
+ *result = fm;
+ return 0;
+}
+
+
+/* The on-flash space is not needed anymore by the passed node. Remove
+ the reference to the node from the node list. If the data chunk in
+ the flash memory isn't used by any more nodes anymore (fm->nodes == 0),
+ then mark that chunk as dirty. */
+int
+jffs_fmfree(struct jffs_fmcontrol *fmc, struct jffs_fm *fm, struct jffs_node *node)
+{
+ struct jffs_node_ref *ref;
+ struct jffs_node_ref *prev;
+ ASSERT(int del = 0);
+
+ D2(printk("jffs_fmfree(): node->ino = %u, node->version = %u\n",
+ node->ino, node->version));
+
+ ASSERT(if (!fmc || !fm || !fm->nodes) {
+ printk(KERN_ERR "jffs_fmfree(): fmc: 0x%p, fm: 0x%p, "
+ "fm->nodes: 0x%p\n",
+ fmc, fm, (fm ? fm->nodes : NULL));
+ return -1;
+ });
+
+ /* Find the reference to the node that is going to be removed
+ and remove it. */
+ for (ref = fm->nodes, prev = NULL; ref; ref = ref->next) {
+ if (ref->node == node) {
+ if (prev) {
+ prev->next = ref->next;
+ }
+ else {
+ fm->nodes = ref->next;
+ }
+ kfree(ref);
+ DJM(no_jffs_node_ref--);
+ ASSERT(del = 1);
+ break;
+ }
+ prev = ref;
+ }
+
+ /* If the data chunk in the flash memory isn't used anymore
+ just mark it as obsolete. */
+ if (!fm->nodes) {
+ /* No node uses this chunk so let's remove it. */
+ fmc->used_size -= fm->size;
+ fmc->dirty_size += fm->size;
+#if defined(JFFS_MARK_OBSOLETE) && JFFS_MARK_OBSOLETE
+ if (jffs_mark_obsolete(fmc, fm->offset) < 0) {
+ D1(printk("jffs_fmfree(): Failed to mark an on-flash "
+ "node obsolete!\n"));
+ return -1;
+ }
+#endif
+ }
+
+ ASSERT(if (!del) {
+ printk(KERN_WARNING "***jffs_fmfree(): "
+ "Didn't delete any node reference!\n");
+ });
+
+ return 0;
+}
+
+
+/* This allocation function is used during the initialization of
+ the file system. */
+struct jffs_fm *
+jffs_fmalloced(struct jffs_fmcontrol *fmc, __u32 offset, __u32 size,
+ struct jffs_node *node)
+{
+ struct jffs_fm *fm;
+
+ D3(printk("jffs_fmalloced()\n"));
+
+ if (!(fm = jffs_alloc_fm())) {
+ D(printk("jffs_fmalloced(0x%p, %u, %u, 0x%p): failed!\n",
+ fmc, offset, size, node));
+ return NULL;
+ }
+ fm->offset = offset;
+ fm->size = size;
+ fm->prev = NULL;
+ fm->next = NULL;
+ fm->nodes = NULL;
+ if (node) {
+ /* `node' exists and it should be associated with the
+ jffs_fm structure `fm'. */
+ if (!(fm->nodes = (struct jffs_node_ref *)
+ kmalloc(sizeof(struct jffs_node_ref),
+ GFP_KERNEL))) {
+ D(printk("jffs_fmalloced(): !fm->nodes\n"));
+ jffs_free_fm(fm);
+ return NULL;
+ }
+ DJM(no_jffs_node_ref++);
+ fm->nodes->node = node;
+ fm->nodes->next = NULL;
+ fmc->used_size += size;
+ fmc->free_size -= size;
+ }
+ else {
+ /* If there is no node, then this is just a chunk of dirt. */
+ fmc->dirty_size += size;
+ fmc->free_size -= size;
+ }
+
+ if (fmc->head_extra) {
+ fm->prev = fmc->tail_extra;
+ fmc->tail_extra->next = fm;
+ fmc->tail_extra = fm;
+ }
+ else if (!fmc->head) {
+ fmc->head = fm;
+ fmc->tail = fm;
+ }
+ else if (fmc->tail->offset + fmc->tail->size < offset) {
+ fmc->head_extra = fm;
+ fmc->tail_extra = fm;
+ }
+ else {
+ fm->prev = fmc->tail;
+ fmc->tail->next = fm;
+ fmc->tail = fm;
+ }
+ D3(jffs_print_fmcontrol(fmc));
+ D3(jffs_print_fm(fm));
+ return fm;
+}
+
+
+/* Add a new node to an already existing jffs_fm struct. */
+int
+jffs_add_node(struct jffs_node *node)
+{
+ struct jffs_node_ref *ref;
+
+ D3(printk("jffs_add_node(): ino = %u\n", node->ino));
+
+ ref = (struct jffs_node_ref *)kmalloc(sizeof(struct jffs_node_ref),
+ GFP_KERNEL);
+ if (!ref)
+ return -ENOMEM;
+
+ DJM(no_jffs_node_ref++);
+ ref->node = node;
+ ref->next = node->fm->nodes;
+ node->fm->nodes = ref;
+ return 0;
+}
+
+
+/* Free a part of some allocated space. */
+void
+jffs_fmfree_partly(struct jffs_fmcontrol *fmc, struct jffs_fm *fm, __u32 size)
+{
+ D1(printk("***jffs_fmfree_partly(): fm = 0x%p, fm->nodes = 0x%p, "
+ "fm->nodes->node->ino = %u, size = %u\n",
+ fm, (fm ? fm->nodes : 0),
+ (!fm ? 0 : (!fm->nodes ? 0 : fm->nodes->node->ino)), size));
+
+ if (fm->nodes) {
+ kfree(fm->nodes);
+ DJM(no_jffs_node_ref--);
+ fm->nodes = NULL;
+ }
+ fmc->used_size -= fm->size;
+ if (fm == fmc->tail) {
+ fm->size -= size;
+ fmc->free_size += size;
+ }
+ fmc->dirty_size += fm->size;
+}
+
+
+/* Find the jffs_fm struct that contains the end of the data chunk that
+ begins at the logical beginning of the flash memory and spans `size'
+ bytes. If we want to erase a sector of the flash memory, we use this
+ function to find where the sector limit cuts a chunk of data. */
+struct jffs_fm *
+jffs_cut_node(struct jffs_fmcontrol *fmc, __u32 size)
+{
+ struct jffs_fm *fm;
+ __u32 pos = 0;
+
+ if (size == 0) {
+ return NULL;
+ }
+
+ ASSERT(if (!fmc) {
+ printk(KERN_ERR "jffs_cut_node(): fmc == NULL\n");
+ return NULL;
+ });
+
+ fm = fmc->head;
+
+ while (fm) {
+ pos += fm->size;
+ if (pos < size) {
+ fm = fm->next;
+ }
+ else if (pos > size) {
+ break;
+ }
+ else {
+ fm = NULL;
+ break;
+ }
+ }
+
+ return fm;
+}
+
+
+/* Move the head of the fmc structures and delete the obsolete parts. */
+void
+jffs_sync_erase(struct jffs_fmcontrol *fmc, int erased_size)
+{
+ struct jffs_fm *fm;
+ struct jffs_fm *del;
+
+ ASSERT(if (!fmc) {
+ printk(KERN_ERR "jffs_sync_erase(): fmc == NULL\n");
+ return;
+ });
+
+ fmc->dirty_size -= erased_size;
+ fmc->free_size += erased_size;
+
+ for (fm = fmc->head; fm && (erased_size > 0);) {
+ if (erased_size >= fm->size) {
+ erased_size -= fm->size;
+ del = fm;
+ fm = fm->next;
+ fm->prev = NULL;
+ fmc->head = fm;
+ jffs_free_fm(del);
+ }
+ else {
+ fm->size -= erased_size;
+ fm->offset += erased_size;
+ break;
+ }
+ }
+}
+
+
+/* Return the oldest used node in the flash memory. */
+struct jffs_node *
+jffs_get_oldest_node(struct jffs_fmcontrol *fmc)
+{
+ struct jffs_fm *fm;
+ struct jffs_node_ref *nref;
+ struct jffs_node *node = NULL;
+
+ ASSERT(if (!fmc) {
+ printk(KERN_ERR "jffs_get_oldest_node(): fmc == NULL\n");
+ return NULL;
+ });
+
+ for (fm = fmc->head; fm && !fm->nodes; fm = fm->next);
+
+ if (!fm) {
+ return NULL;
+ }
+
+ /* The oldest node is the last one in the reference list. This list
+ shouldn't be too long; just one or perhaps two elements. */
+ for (nref = fm->nodes; nref; nref = nref->next) {
+ node = nref->node;
+ }
+
+ D2(printk("jffs_get_oldest_node(): ino = %u, version = %u\n",
+ (node ? node->ino : 0), (node ? node->version : 0)));
+
+ return node;
+}
+
+
+#if defined(JFFS_MARK_OBSOLETE) && JFFS_MARK_OBSOLETE
+
+/* Mark an on-flash node as obsolete.
+
+ Note that this is just an optimization that isn't necessary for the
+ filesystem to work. */
+
+static int
+jffs_mark_obsolete(struct jffs_fmcontrol *fmc, __u32 fm_offset)
+{
+ /* The `accurate_pos' holds the position of the accurate byte
+ in the jffs_raw_inode structure that we are going to mark
+ as obsolete. */
+ __u32 accurate_pos = fm_offset + JFFS_RAW_INODE_ACCURATE_OFFSET;
+ unsigned char zero = 0x00;
+ size_t len;
+
+ D3(printk("jffs_mark_obsolete(): accurate_pos = %u\n", accurate_pos));
+ ASSERT(if (!fmc) {
+ printk(KERN_ERR "jffs_mark_obsolete(): fmc == NULL\n");
+ return -1;
+ });
+
+ /* Write 0x00 to the raw inode's accurate member. Don't care
+ about the return value. */
+ MTD_WRITE(fmc->mtd, accurate_pos, 1, &len, &zero);
+ return 0;
+}
+
+#endif /* JFFS_MARK_OBSOLETE */
+
+/* check if it's possible to erase the wanted range, and if not, return
+ * the range that IS erasable, or a negative error code.
+ */
+static long
+jffs_flash_erasable_size(struct mtd_info *mtd, __u32 offset, __u32 size)
+{
+ u_long ssize;
+
+ /* assume that sector size for a partition is constant even
+ * if it spans more than one chip (you usually put the same
+ * type of chips in a system)
+ */
+
+ ssize = mtd->erasesize;
+
+ if (offset % ssize) {
+ printk(KERN_WARNING "jffs_flash_erasable_size() given non-aligned offset %x (erasesize %lx)\n", offset, ssize);
+ /* The offset is not sector size aligned. */
+ return -1;
+ }
+ else if (offset > mtd->size) {
+ printk(KERN_WARNING "jffs_flash_erasable_size given offset off the end of device (%x > %x)\n", offset, mtd->size);
+ return -2;
+ }
+ else if (offset + size > mtd->size) {
+ printk(KERN_WARNING "jffs_flash_erasable_size() given length which runs off the end of device (ofs %x + len %x = %x, > %x)\n", offset,size, offset+size, mtd->size);
+ return -3;
+ }
+
+ return (size / ssize) * ssize;
+}
+
+
+/* How much dirty flash memory is possible to erase at the moment? */
+long
+jffs_erasable_size(struct jffs_fmcontrol *fmc)
+{
+ struct jffs_fm *fm;
+ __u32 size = 0;
+ long ret;
+
+ ASSERT(if (!fmc) {
+ printk(KERN_ERR "jffs_erasable_size(): fmc = NULL\n");
+ return -1;
+ });
+
+ if (!fmc->head) {
+ /* The flash memory is totally empty. No nodes. No dirt.
+ Just return. */
+ return 0;
+ }
+
+ /* Calculate how much space that is dirty. */
+ for (fm = fmc->head; fm && !fm->nodes; fm = fm->next) {
+ if (size && fm->offset == 0) {
+ /* We have reached the beginning of the flash. */
+ break;
+ }
+ size += fm->size;
+ }
+
+ /* Someone's signature contained this:
+ There's a fine line between fishing and just standing on
+ the shore like an idiot... */
+ ret = jffs_flash_erasable_size(fmc->mtd, fmc->head->offset, size);
+
+ ASSERT(if (ret < 0) {
+ printk("jffs_erasable_size: flash_erasable_size() "
+ "returned something less than zero (%ld).\n", ret);
+ printk("jffs_erasable_size: offset = 0x%08x\n",
+ fmc->head->offset);
+ });
+
+ /* If there is dirt on the flash (which is the reason to why
+ this function was called in the first place) but no space is
+ possible to erase right now, the initial part of the list of
+ jffs_fm structs, that hold place for dirty space, could perhaps
+ be shortened. The list's initial "dirty" elements are merged
+ into just one large dirty jffs_fm struct. This operation must
+ only be performed if nothing is possible to erase. Otherwise,
+ jffs_clear_end_of_node() won't work as expected. */
+ if (ret == 0) {
+ struct jffs_fm *head = fmc->head;
+ struct jffs_fm *del;
+ /* While there are two dirty nodes beside each other.*/
+ while (head->nodes == 0
+ && head->next
+ && head->next->nodes == 0) {
+ del = head->next;
+ head->size += del->size;
+ head->next = del->next;
+ if (del->next) {
+ del->next->prev = head;
+ }
+ jffs_free_fm(del);
+ }
+ }
+
+ return (ret >= 0 ? ret : 0);
+}
+
+static struct jffs_fm *jffs_alloc_fm(void)
+{
+ struct jffs_fm *fm;
+
+ fm = kmem_cache_alloc(fm_cache,GFP_KERNEL);
+ DJM(if (fm) no_jffs_fm++;);
+
+ return fm;
+}
+
+static void jffs_free_fm(struct jffs_fm *n)
+{
+ kmem_cache_free(fm_cache,n);
+ DJM(no_jffs_fm--);
+}
+
+
+
+struct jffs_node *jffs_alloc_node(void)
+{
+ struct jffs_node *n;
+
+ n = (struct jffs_node *)kmem_cache_alloc(node_cache,GFP_KERNEL);
+ if(n != NULL)
+ no_jffs_node++;
+ return n;
+}
+
+void jffs_free_node(struct jffs_node *n)
+{
+ kmem_cache_free(node_cache,n);
+ no_jffs_node--;
+}
+
+
+int jffs_get_node_inuse(void)
+{
+ return no_jffs_node;
+}
+
+void
+jffs_print_fmcontrol(struct jffs_fmcontrol *fmc)
+{
+ D(printk("struct jffs_fmcontrol: 0x%p\n", fmc));
+ D(printk("{\n"));
+ D(printk(" %u, /* flash_size */\n", fmc->flash_size));
+ D(printk(" %u, /* used_size */\n", fmc->used_size));
+ D(printk(" %u, /* dirty_size */\n", fmc->dirty_size));
+ D(printk(" %u, /* free_size */\n", fmc->free_size));
+ D(printk(" %u, /* sector_size */\n", fmc->sector_size));
+ D(printk(" %u, /* min_free_size */\n", fmc->min_free_size));
+ D(printk(" %u, /* max_chunk_size */\n", fmc->max_chunk_size));
+ D(printk(" 0x%p, /* mtd */\n", fmc->mtd));
+ D(printk(" 0x%p, /* head */ "
+ "(head->offset = 0x%08x)\n",
+ fmc->head, (fmc->head ? fmc->head->offset : 0)));
+ D(printk(" 0x%p, /* tail */ "
+ "(tail->offset + tail->size = 0x%08x)\n",
+ fmc->tail,
+ (fmc->tail ? fmc->tail->offset + fmc->tail->size : 0)));
+ D(printk(" 0x%p, /* head_extra */\n", fmc->head_extra));
+ D(printk(" 0x%p, /* tail_extra */\n", fmc->tail_extra));
+ D(printk("}\n"));
+}
+
+void
+jffs_print_fm(struct jffs_fm *fm)
+{
+ D(printk("struct jffs_fm: 0x%p\n", fm));
+ D(printk("{\n"));
+ D(printk(" 0x%08x, /* offset */\n", fm->offset));
+ D(printk(" %u, /* size */\n", fm->size));
+ D(printk(" 0x%p, /* prev */\n", fm->prev));
+ D(printk(" 0x%p, /* next */\n", fm->next));
+ D(printk(" 0x%p, /* nodes */\n", fm->nodes));
+ D(printk("}\n"));
+}
+
+#if 0
+void
+jffs_print_node_ref(struct jffs_node_ref *ref)
+{
+ D(printk("struct jffs_node_ref: 0x%p\n", ref));
+ D(printk("{\n"));
+ D(printk(" 0x%p, /* node */\n", ref->node));
+ D(printk(" 0x%p, /* next */\n", ref->next));
+ D(printk("}\n"));
+}
+#endif /* 0 */
+