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-rw-r--r--fs/jffs2/erase.c442
1 files changed, 442 insertions, 0 deletions
diff --git a/fs/jffs2/erase.c b/fs/jffs2/erase.c
new file mode 100644
index 0000000..41451e8
--- /dev/null
+++ b/fs/jffs2/erase.c
@@ -0,0 +1,442 @@
+/*
+ * JFFS2 -- Journalling Flash File System, Version 2.
+ *
+ * Copyright (C) 2001-2003 Red Hat, Inc.
+ *
+ * Created by David Woodhouse <dwmw2@infradead.org>
+ *
+ * For licensing information, see the file 'LICENCE' in this directory.
+ *
+ * $Id: erase.c,v 1.66 2004/11/16 20:36:11 dwmw2 Exp $
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/mtd/mtd.h>
+#include <linux/compiler.h>
+#include <linux/crc32.h>
+#include <linux/sched.h>
+#include <linux/pagemap.h>
+#include "nodelist.h"
+
+struct erase_priv_struct {
+ struct jffs2_eraseblock *jeb;
+ struct jffs2_sb_info *c;
+};
+
+#ifndef __ECOS
+static void jffs2_erase_callback(struct erase_info *);
+#endif
+static void jffs2_erase_failed(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t bad_offset);
+static void jffs2_erase_succeeded(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb);
+static void jffs2_free_all_node_refs(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb);
+static void jffs2_mark_erased_block(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb);
+
+static void jffs2_erase_block(struct jffs2_sb_info *c,
+ struct jffs2_eraseblock *jeb)
+{
+ int ret;
+ uint32_t bad_offset;
+#ifdef __ECOS
+ ret = jffs2_flash_erase(c, jeb);
+ if (!ret) {
+ jffs2_erase_succeeded(c, jeb);
+ return;
+ }
+ bad_offset = jeb->offset;
+#else /* Linux */
+ struct erase_info *instr;
+
+ instr = kmalloc(sizeof(struct erase_info) + sizeof(struct erase_priv_struct), GFP_KERNEL);
+ if (!instr) {
+ printk(KERN_WARNING "kmalloc for struct erase_info in jffs2_erase_block failed. Refiling block for later\n");
+ spin_lock(&c->erase_completion_lock);
+ list_del(&jeb->list);
+ list_add(&jeb->list, &c->erase_pending_list);
+ c->erasing_size -= c->sector_size;
+ c->dirty_size += c->sector_size;
+ jeb->dirty_size = c->sector_size;
+ spin_unlock(&c->erase_completion_lock);
+ return;
+ }
+
+ memset(instr, 0, sizeof(*instr));
+
+ instr->mtd = c->mtd;
+ instr->addr = jeb->offset;
+ instr->len = c->sector_size;
+ instr->callback = jffs2_erase_callback;
+ instr->priv = (unsigned long)(&instr[1]);
+ instr->fail_addr = 0xffffffff;
+
+ ((struct erase_priv_struct *)instr->priv)->jeb = jeb;
+ ((struct erase_priv_struct *)instr->priv)->c = c;
+
+ ret = c->mtd->erase(c->mtd, instr);
+ if (!ret)
+ return;
+
+ bad_offset = instr->fail_addr;
+ kfree(instr);
+#endif /* __ECOS */
+
+ if (ret == -ENOMEM || ret == -EAGAIN) {
+ /* Erase failed immediately. Refile it on the list */
+ D1(printk(KERN_DEBUG "Erase at 0x%08x failed: %d. Refiling on erase_pending_list\n", jeb->offset, ret));
+ spin_lock(&c->erase_completion_lock);
+ list_del(&jeb->list);
+ list_add(&jeb->list, &c->erase_pending_list);
+ c->erasing_size -= c->sector_size;
+ c->dirty_size += c->sector_size;
+ jeb->dirty_size = c->sector_size;
+ spin_unlock(&c->erase_completion_lock);
+ return;
+ }
+
+ if (ret == -EROFS)
+ printk(KERN_WARNING "Erase at 0x%08x failed immediately: -EROFS. Is the sector locked?\n", jeb->offset);
+ else
+ printk(KERN_WARNING "Erase at 0x%08x failed immediately: errno %d\n", jeb->offset, ret);
+
+ jffs2_erase_failed(c, jeb, bad_offset);
+}
+
+void jffs2_erase_pending_blocks(struct jffs2_sb_info *c, int count)
+{
+ struct jffs2_eraseblock *jeb;
+
+ down(&c->erase_free_sem);
+
+ spin_lock(&c->erase_completion_lock);
+
+ while (!list_empty(&c->erase_complete_list) ||
+ !list_empty(&c->erase_pending_list)) {
+
+ if (!list_empty(&c->erase_complete_list)) {
+ jeb = list_entry(c->erase_complete_list.next, struct jffs2_eraseblock, list);
+ list_del(&jeb->list);
+ spin_unlock(&c->erase_completion_lock);
+ jffs2_mark_erased_block(c, jeb);
+
+ if (!--count) {
+ D1(printk(KERN_DEBUG "Count reached. jffs2_erase_pending_blocks leaving\n"));
+ goto done;
+ }
+
+ } else if (!list_empty(&c->erase_pending_list)) {
+ jeb = list_entry(c->erase_pending_list.next, struct jffs2_eraseblock, list);
+ D1(printk(KERN_DEBUG "Starting erase of pending block 0x%08x\n", jeb->offset));
+ list_del(&jeb->list);
+ c->erasing_size += c->sector_size;
+ c->wasted_size -= jeb->wasted_size;
+ c->free_size -= jeb->free_size;
+ c->used_size -= jeb->used_size;
+ c->dirty_size -= jeb->dirty_size;
+ jeb->wasted_size = jeb->used_size = jeb->dirty_size = jeb->free_size = 0;
+ jffs2_free_all_node_refs(c, jeb);
+ list_add(&jeb->list, &c->erasing_list);
+ spin_unlock(&c->erase_completion_lock);
+
+ jffs2_erase_block(c, jeb);
+
+ } else {
+ BUG();
+ }
+
+ /* Be nice */
+ cond_resched();
+ spin_lock(&c->erase_completion_lock);
+ }
+
+ spin_unlock(&c->erase_completion_lock);
+ done:
+ D1(printk(KERN_DEBUG "jffs2_erase_pending_blocks completed\n"));
+
+ up(&c->erase_free_sem);
+}
+
+static void jffs2_erase_succeeded(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
+{
+ D1(printk(KERN_DEBUG "Erase completed successfully at 0x%08x\n", jeb->offset));
+ spin_lock(&c->erase_completion_lock);
+ list_del(&jeb->list);
+ list_add_tail(&jeb->list, &c->erase_complete_list);
+ spin_unlock(&c->erase_completion_lock);
+ /* Ensure that kupdated calls us again to mark them clean */
+ jffs2_erase_pending_trigger(c);
+}
+
+static void jffs2_erase_failed(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t bad_offset)
+{
+ /* For NAND, if the failure did not occur at the device level for a
+ specific physical page, don't bother updating the bad block table. */
+ if (jffs2_cleanmarker_oob(c) && (bad_offset != 0xffffffff)) {
+ /* We had a device-level failure to erase. Let's see if we've
+ failed too many times. */
+ if (!jffs2_write_nand_badblock(c, jeb, bad_offset)) {
+ /* We'd like to give this block another try. */
+ spin_lock(&c->erase_completion_lock);
+ list_del(&jeb->list);
+ list_add(&jeb->list, &c->erase_pending_list);
+ c->erasing_size -= c->sector_size;
+ c->dirty_size += c->sector_size;
+ jeb->dirty_size = c->sector_size;
+ spin_unlock(&c->erase_completion_lock);
+ return;
+ }
+ }
+
+ spin_lock(&c->erase_completion_lock);
+ c->erasing_size -= c->sector_size;
+ c->bad_size += c->sector_size;
+ list_del(&jeb->list);
+ list_add(&jeb->list, &c->bad_list);
+ c->nr_erasing_blocks--;
+ spin_unlock(&c->erase_completion_lock);
+ wake_up(&c->erase_wait);
+}
+
+#ifndef __ECOS
+static void jffs2_erase_callback(struct erase_info *instr)
+{
+ struct erase_priv_struct *priv = (void *)instr->priv;
+
+ if(instr->state != MTD_ERASE_DONE) {
+ printk(KERN_WARNING "Erase at 0x%08x finished, but state != MTD_ERASE_DONE. State is 0x%x instead.\n", instr->addr, instr->state);
+ jffs2_erase_failed(priv->c, priv->jeb, instr->fail_addr);
+ } else {
+ jffs2_erase_succeeded(priv->c, priv->jeb);
+ }
+ kfree(instr);
+}
+#endif /* !__ECOS */
+
+/* Hmmm. Maybe we should accept the extra space it takes and make
+ this a standard doubly-linked list? */
+static inline void jffs2_remove_node_refs_from_ino_list(struct jffs2_sb_info *c,
+ struct jffs2_raw_node_ref *ref, struct jffs2_eraseblock *jeb)
+{
+ struct jffs2_inode_cache *ic = NULL;
+ struct jffs2_raw_node_ref **prev;
+
+ prev = &ref->next_in_ino;
+
+ /* Walk the inode's list once, removing any nodes from this eraseblock */
+ while (1) {
+ if (!(*prev)->next_in_ino) {
+ /* We're looking at the jffs2_inode_cache, which is
+ at the end of the linked list. Stash it and continue
+ from the beginning of the list */
+ ic = (struct jffs2_inode_cache *)(*prev);
+ prev = &ic->nodes;
+ continue;
+ }
+
+ if (((*prev)->flash_offset & ~(c->sector_size -1)) == jeb->offset) {
+ /* It's in the block we're erasing */
+ struct jffs2_raw_node_ref *this;
+
+ this = *prev;
+ *prev = this->next_in_ino;
+ this->next_in_ino = NULL;
+
+ if (this == ref)
+ break;
+
+ continue;
+ }
+ /* Not to be deleted. Skip */
+ prev = &((*prev)->next_in_ino);
+ }
+
+ /* PARANOIA */
+ if (!ic) {
+ printk(KERN_WARNING "inode_cache not found in remove_node_refs()!!\n");
+ return;
+ }
+
+ D1(printk(KERN_DEBUG "Removed nodes in range 0x%08x-0x%08x from ino #%u\n",
+ jeb->offset, jeb->offset + c->sector_size, ic->ino));
+
+ D2({
+ int i=0;
+ struct jffs2_raw_node_ref *this;
+ printk(KERN_DEBUG "After remove_node_refs_from_ino_list: \n" KERN_DEBUG);
+
+ this = ic->nodes;
+
+ while(this) {
+ printk( "0x%08x(%d)->", ref_offset(this), ref_flags(this));
+ if (++i == 5) {
+ printk("\n" KERN_DEBUG);
+ i=0;
+ }
+ this = this->next_in_ino;
+ }
+ printk("\n");
+ });
+
+ if (ic->nodes == (void *)ic) {
+ D1(printk(KERN_DEBUG "inocache for ino #%u is all gone now. Freeing\n", ic->ino));
+ jffs2_del_ino_cache(c, ic);
+ jffs2_free_inode_cache(ic);
+ }
+}
+
+static void jffs2_free_all_node_refs(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
+{
+ struct jffs2_raw_node_ref *ref;
+ D1(printk(KERN_DEBUG "Freeing all node refs for eraseblock offset 0x%08x\n", jeb->offset));
+ while(jeb->first_node) {
+ ref = jeb->first_node;
+ jeb->first_node = ref->next_phys;
+
+ /* Remove from the inode-list */
+ if (ref->next_in_ino)
+ jffs2_remove_node_refs_from_ino_list(c, ref, jeb);
+ /* else it was a non-inode node or already removed, so don't bother */
+
+ jffs2_free_raw_node_ref(ref);
+ }
+ jeb->last_node = NULL;
+}
+
+static void jffs2_mark_erased_block(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
+{
+ struct jffs2_raw_node_ref *marker_ref = NULL;
+ unsigned char *ebuf;
+ size_t retlen;
+ int ret;
+ uint32_t bad_offset;
+
+ if (!jffs2_cleanmarker_oob(c)) {
+ marker_ref = jffs2_alloc_raw_node_ref();
+ if (!marker_ref) {
+ printk(KERN_WARNING "Failed to allocate raw node ref for clean marker\n");
+ /* Stick it back on the list from whence it came and come back later */
+ jffs2_erase_pending_trigger(c);
+ spin_lock(&c->erase_completion_lock);
+ list_add(&jeb->list, &c->erase_complete_list);
+ spin_unlock(&c->erase_completion_lock);
+ return;
+ }
+ }
+ ebuf = kmalloc(PAGE_SIZE, GFP_KERNEL);
+ if (!ebuf) {
+ printk(KERN_WARNING "Failed to allocate page buffer for verifying erase at 0x%08x. Assuming it worked\n", jeb->offset);
+ } else {
+ uint32_t ofs = jeb->offset;
+
+ D1(printk(KERN_DEBUG "Verifying erase at 0x%08x\n", jeb->offset));
+ while(ofs < jeb->offset + c->sector_size) {
+ uint32_t readlen = min((uint32_t)PAGE_SIZE, jeb->offset + c->sector_size - ofs);
+ int i;
+
+ bad_offset = ofs;
+
+ ret = jffs2_flash_read(c, ofs, readlen, &retlen, ebuf);
+ if (ret) {
+ printk(KERN_WARNING "Read of newly-erased block at 0x%08x failed: %d. Putting on bad_list\n", ofs, ret);
+ goto bad;
+ }
+ if (retlen != readlen) {
+ printk(KERN_WARNING "Short read from newly-erased block at 0x%08x. Wanted %d, got %zd\n", ofs, readlen, retlen);
+ goto bad;
+ }
+ for (i=0; i<readlen; i += sizeof(unsigned long)) {
+ /* It's OK. We know it's properly aligned */
+ unsigned long datum = *(unsigned long *)(&ebuf[i]);
+ if (datum + 1) {
+ bad_offset += i;
+ printk(KERN_WARNING "Newly-erased block contained word 0x%lx at offset 0x%08x\n", datum, bad_offset);
+ bad:
+ if (!jffs2_cleanmarker_oob(c))
+ jffs2_free_raw_node_ref(marker_ref);
+ kfree(ebuf);
+ bad2:
+ spin_lock(&c->erase_completion_lock);
+ /* Stick it on a list (any list) so
+ erase_failed can take it right off
+ again. Silly, but shouldn't happen
+ often. */
+ list_add(&jeb->list, &c->erasing_list);
+ spin_unlock(&c->erase_completion_lock);
+ jffs2_erase_failed(c, jeb, bad_offset);
+ return;
+ }
+ }
+ ofs += readlen;
+ cond_resched();
+ }
+ kfree(ebuf);
+ }
+
+ bad_offset = jeb->offset;
+
+ /* Write the erase complete marker */
+ D1(printk(KERN_DEBUG "Writing erased marker to block at 0x%08x\n", jeb->offset));
+ if (jffs2_cleanmarker_oob(c)) {
+
+ if (jffs2_write_nand_cleanmarker(c, jeb))
+ goto bad2;
+
+ jeb->first_node = jeb->last_node = NULL;
+
+ jeb->free_size = c->sector_size;
+ jeb->used_size = 0;
+ jeb->dirty_size = 0;
+ jeb->wasted_size = 0;
+ } else {
+ struct kvec vecs[1];
+ struct jffs2_unknown_node marker = {
+ .magic = cpu_to_je16(JFFS2_MAGIC_BITMASK),
+ .nodetype = cpu_to_je16(JFFS2_NODETYPE_CLEANMARKER),
+ .totlen = cpu_to_je32(c->cleanmarker_size)
+ };
+
+ marker.hdr_crc = cpu_to_je32(crc32(0, &marker, sizeof(struct jffs2_unknown_node)-4));
+
+ vecs[0].iov_base = (unsigned char *) &marker;
+ vecs[0].iov_len = sizeof(marker);
+ ret = jffs2_flash_direct_writev(c, vecs, 1, jeb->offset, &retlen);
+
+ if (ret) {
+ printk(KERN_WARNING "Write clean marker to block at 0x%08x failed: %d\n",
+ jeb->offset, ret);
+ goto bad2;
+ }
+ if (retlen != sizeof(marker)) {
+ printk(KERN_WARNING "Short write to newly-erased block at 0x%08x: Wanted %zd, got %zd\n",
+ jeb->offset, sizeof(marker), retlen);
+ goto bad2;
+ }
+
+ marker_ref->next_in_ino = NULL;
+ marker_ref->next_phys = NULL;
+ marker_ref->flash_offset = jeb->offset | REF_NORMAL;
+ marker_ref->__totlen = c->cleanmarker_size;
+
+ jeb->first_node = jeb->last_node = marker_ref;
+
+ jeb->free_size = c->sector_size - c->cleanmarker_size;
+ jeb->used_size = c->cleanmarker_size;
+ jeb->dirty_size = 0;
+ jeb->wasted_size = 0;
+ }
+
+ spin_lock(&c->erase_completion_lock);
+ c->erasing_size -= c->sector_size;
+ c->free_size += jeb->free_size;
+ c->used_size += jeb->used_size;
+
+ ACCT_SANITY_CHECK(c,jeb);
+ D1(ACCT_PARANOIA_CHECK(jeb));
+
+ list_add_tail(&jeb->list, &c->free_list);
+ c->nr_erasing_blocks--;
+ c->nr_free_blocks++;
+ spin_unlock(&c->erase_completion_lock);
+ wake_up(&c->erase_wait);
+}
+
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