summaryrefslogtreecommitdiffstats
path: root/fs/jffs2/erase.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--fs/jffs2/erase.c486
1 files changed, 486 insertions, 0 deletions
diff --git a/fs/jffs2/erase.c b/fs/jffs2/erase.c
new file mode 100644
index 0000000000..acd32f05b5
--- /dev/null
+++ b/fs/jffs2/erase.c
@@ -0,0 +1,486 @@
+/*
+ * JFFS2 -- Journalling Flash File System, Version 2.
+ *
+ * Copyright © 2001-2007 Red Hat, Inc.
+ * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
+ *
+ * Created by David Woodhouse <dwmw2@infradead.org>
+ *
+ * For licensing information, see the file 'LICENCE' in this directory.
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#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"
+
+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_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;
+
+ jffs2_dbg(1, "%s(): erase block %#08x (range %#08x-%#08x)\n",
+ __func__,
+ jeb->offset, jeb->offset, jeb->offset + c->sector_size);
+ instr = kzalloc(sizeof(struct erase_info), GFP_KERNEL);
+ if (!instr) {
+ pr_warn("kzalloc for struct erase_info in jffs2_erase_block failed. Refiling block for later\n");
+ mutex_lock(&c->erase_free_sem);
+ spin_lock(&c->erase_completion_lock);
+ list_move(&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);
+ mutex_unlock(&c->erase_free_sem);
+ return;
+ }
+
+ instr->addr = jeb->offset;
+ instr->len = c->sector_size;
+
+ ret = mtd_erase(c->mtd, instr);
+ if (!ret) {
+ jffs2_erase_succeeded(c, jeb);
+ kfree(instr);
+ return;
+ }
+
+ bad_offset = instr->fail_addr;
+ kfree(instr);
+#endif /* __ECOS */
+
+ if (ret == -ENOMEM || ret == -EAGAIN) {
+ /* Erase failed immediately. Refile it on the list */
+ jffs2_dbg(1, "Erase at 0x%08x failed: %d. Refiling on erase_pending_list\n",
+ jeb->offset, ret);
+ mutex_lock(&c->erase_free_sem);
+ spin_lock(&c->erase_completion_lock);
+ list_move(&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);
+ mutex_unlock(&c->erase_free_sem);
+ return;
+ }
+
+ if (ret == -EROFS)
+ pr_warn("Erase at 0x%08x failed immediately: -EROFS. Is the sector locked?\n",
+ jeb->offset);
+ else
+ pr_warn("Erase at 0x%08x failed immediately: errno %d\n",
+ jeb->offset, ret);
+
+ jffs2_erase_failed(c, jeb, bad_offset);
+}
+
+int jffs2_erase_pending_blocks(struct jffs2_sb_info *c, int count)
+{
+ struct jffs2_eraseblock *jeb;
+ int work_done = 0;
+
+ mutex_lock(&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_move(&jeb->list, &c->erase_checking_list);
+ spin_unlock(&c->erase_completion_lock);
+ mutex_unlock(&c->erase_free_sem);
+ jffs2_mark_erased_block(c, jeb);
+
+ work_done++;
+ if (!--count) {
+ jffs2_dbg(1, "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);
+ jffs2_dbg(1, "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_jeb_node_refs(c, jeb);
+ list_add(&jeb->list, &c->erasing_list);
+ spin_unlock(&c->erase_completion_lock);
+ mutex_unlock(&c->erase_free_sem);
+
+ jffs2_erase_block(c, jeb);
+
+ } else {
+ BUG();
+ }
+
+ /* Be nice */
+ cond_resched();
+ mutex_lock(&c->erase_free_sem);
+ spin_lock(&c->erase_completion_lock);
+ }
+
+ spin_unlock(&c->erase_completion_lock);
+ mutex_unlock(&c->erase_free_sem);
+ done:
+ jffs2_dbg(1, "jffs2_erase_pending_blocks completed\n");
+ return work_done;
+}
+
+static void jffs2_erase_succeeded(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
+{
+ jffs2_dbg(1, "Erase completed successfully at 0x%08x\n", jeb->offset);
+ mutex_lock(&c->erase_free_sem);
+ spin_lock(&c->erase_completion_lock);
+ list_move_tail(&jeb->list, &c->erase_complete_list);
+ /* Wake the GC thread to mark them clean */
+ jffs2_garbage_collect_trigger(c);
+ spin_unlock(&c->erase_completion_lock);
+ mutex_unlock(&c->erase_free_sem);
+ wake_up(&c->erase_wait);
+}
+
+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 != (uint32_t)MTD_FAIL_ADDR_UNKNOWN)) {
+ /* 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. */
+ mutex_lock(&c->erase_free_sem);
+ spin_lock(&c->erase_completion_lock);
+ list_move(&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);
+ mutex_unlock(&c->erase_free_sem);
+ return;
+ }
+ }
+
+ mutex_lock(&c->erase_free_sem);
+ spin_lock(&c->erase_completion_lock);
+ c->erasing_size -= c->sector_size;
+ c->bad_size += c->sector_size;
+ list_move(&jeb->list, &c->bad_list);
+ c->nr_erasing_blocks--;
+ spin_unlock(&c->erase_completion_lock);
+ mutex_unlock(&c->erase_free_sem);
+ wake_up(&c->erase_wait);
+}
+
+/* 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 (SECTOR_ADDR((*prev)->flash_offset) == 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) {
+ JFFS2_WARNING("inode_cache/xattr_datum/xattr_ref"
+ " not found in remove_node_refs()!!\n");
+ return;
+ }
+
+ jffs2_dbg(1, "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");
+
+ this = ic->nodes;
+
+ printk(KERN_DEBUG);
+ while(this) {
+ pr_cont("0x%08x(%d)->",
+ ref_offset(this), ref_flags(this));
+ if (++i == 5) {
+ printk(KERN_DEBUG);
+ i=0;
+ }
+ this = this->next_in_ino;
+ }
+ pr_cont("\n");
+ });
+
+ switch (ic->class) {
+#ifdef CONFIG_JFFS2_FS_XATTR
+ case RAWNODE_CLASS_XATTR_DATUM:
+ jffs2_release_xattr_datum(c, (struct jffs2_xattr_datum *)ic);
+ break;
+ case RAWNODE_CLASS_XATTR_REF:
+ jffs2_release_xattr_ref(c, (struct jffs2_xattr_ref *)ic);
+ break;
+#endif
+ default:
+ if (ic->nodes == (void *)ic && ic->pino_nlink == 0)
+ jffs2_del_ino_cache(c, ic);
+ }
+}
+
+void jffs2_free_jeb_node_refs(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
+{
+ struct jffs2_raw_node_ref *block, *ref;
+ jffs2_dbg(1, "Freeing all node refs for eraseblock offset 0x%08x\n",
+ jeb->offset);
+
+ block = ref = jeb->first_node;
+
+ while (ref) {
+ if (ref->flash_offset == REF_LINK_NODE) {
+ ref = ref->next_in_ino;
+ jffs2_free_refblock(block);
+ block = ref;
+ continue;
+ }
+ if (ref->flash_offset != REF_EMPTY_NODE && 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 */
+
+ ref++;
+ }
+ jeb->first_node = jeb->last_node = NULL;
+}
+
+static int jffs2_block_check_erase(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t *bad_offset)
+{
+ void *ebuf;
+ uint32_t ofs;
+ size_t retlen;
+ int ret;
+ unsigned long *wordebuf;
+
+ ret = mtd_point(c->mtd, jeb->offset, c->sector_size, &retlen,
+ &ebuf, NULL);
+ if (ret != -EOPNOTSUPP) {
+ if (ret) {
+ jffs2_dbg(1, "MTD point failed %d\n", ret);
+ goto do_flash_read;
+ }
+ if (retlen < c->sector_size) {
+ /* Don't muck about if it won't let us point to the whole erase sector */
+ jffs2_dbg(1, "MTD point returned len too short: 0x%zx\n",
+ retlen);
+ mtd_unpoint(c->mtd, jeb->offset, retlen);
+ goto do_flash_read;
+ }
+ wordebuf = ebuf-sizeof(*wordebuf);
+ retlen /= sizeof(*wordebuf);
+ do {
+ if (*++wordebuf != ~0)
+ break;
+ } while(--retlen);
+ mtd_unpoint(c->mtd, jeb->offset, c->sector_size);
+ if (retlen) {
+ pr_warn("Newly-erased block contained word 0x%lx at offset 0x%08tx\n",
+ *wordebuf,
+ jeb->offset +
+ c->sector_size-retlen * sizeof(*wordebuf));
+ return -EIO;
+ }
+ return 0;
+ }
+ do_flash_read:
+ ebuf = kmalloc(PAGE_SIZE, GFP_KERNEL);
+ if (!ebuf) {
+ pr_warn("Failed to allocate page buffer for verifying erase at 0x%08x. Refiling\n",
+ jeb->offset);
+ return -EAGAIN;
+ }
+
+ jffs2_dbg(1, "Verifying erase at 0x%08x\n", jeb->offset);
+
+ for (ofs = jeb->offset; 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 = mtd_read(c->mtd, ofs, readlen, &retlen, ebuf);
+ if (ret) {
+ pr_warn("Read of newly-erased block at 0x%08x failed: %d. Putting on bad_list\n",
+ ofs, ret);
+ ret = -EIO;
+ goto fail;
+ }
+ if (retlen != readlen) {
+ pr_warn("Short read from newly-erased block at 0x%08x. Wanted %d, got %zd\n",
+ ofs, readlen, retlen);
+ ret = -EIO;
+ goto fail;
+ }
+ for (i=0; i<readlen; i += sizeof(unsigned long)) {
+ /* It's OK. We know it's properly aligned */
+ unsigned long *datum = ebuf + i;
+ if (*datum + 1) {
+ *bad_offset += i;
+ pr_warn("Newly-erased block contained word 0x%lx at offset 0x%08x\n",
+ *datum, *bad_offset);
+ ret = -EIO;
+ goto fail;
+ }
+ }
+ ofs += readlen;
+ cond_resched();
+ }
+ ret = 0;
+fail:
+ kfree(ebuf);
+ return ret;
+}
+
+static void jffs2_mark_erased_block(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
+{
+ size_t retlen;
+ int ret;
+ uint32_t bad_offset;
+
+ switch (jffs2_block_check_erase(c, jeb, &bad_offset)) {
+ case -EAGAIN: goto refile;
+ case -EIO: goto filebad;
+ }
+
+ /* Write the erase complete marker */
+ jffs2_dbg(1, "Writing erased marker to block at 0x%08x\n", jeb->offset);
+ bad_offset = jeb->offset;
+
+ /* Cleanmarker in oob area or no cleanmarker at all ? */
+ if (jffs2_cleanmarker_oob(c) || c->cleanmarker_size == 0) {
+
+ if (jffs2_cleanmarker_oob(c)) {
+ if (jffs2_write_nand_cleanmarker(c, jeb))
+ goto filebad;
+ }
+ } 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)
+ };
+
+ jffs2_prealloc_raw_node_refs(c, jeb, 1);
+
+ 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 || retlen != sizeof(marker)) {
+ if (ret)
+ pr_warn("Write clean marker to block at 0x%08x failed: %d\n",
+ jeb->offset, ret);
+ else
+ pr_warn("Short write to newly-erased block at 0x%08x: Wanted %zd, got %zd\n",
+ jeb->offset, sizeof(marker), retlen);
+
+ goto filebad;
+ }
+ }
+ /* Everything else got zeroed before the erase */
+ jeb->free_size = c->sector_size;
+
+ mutex_lock(&c->erase_free_sem);
+ spin_lock(&c->erase_completion_lock);
+
+ c->erasing_size -= c->sector_size;
+ c->free_size += c->sector_size;
+
+ /* Account for cleanmarker now, if it's in-band */
+ if (c->cleanmarker_size && !jffs2_cleanmarker_oob(c))
+ jffs2_link_node_ref(c, jeb, jeb->offset | REF_NORMAL, c->cleanmarker_size, NULL);
+
+ list_move_tail(&jeb->list, &c->free_list);
+ c->nr_erasing_blocks--;
+ c->nr_free_blocks++;
+
+ jffs2_dbg_acct_sanity_check_nolock(c, jeb);
+ jffs2_dbg_acct_paranoia_check_nolock(c, jeb);
+
+ spin_unlock(&c->erase_completion_lock);
+ mutex_unlock(&c->erase_free_sem);
+ wake_up(&c->erase_wait);
+ return;
+
+filebad:
+ jffs2_erase_failed(c, jeb, bad_offset);
+ return;
+
+refile:
+ /* Stick it back on the list from whence it came and come back later */
+ mutex_lock(&c->erase_free_sem);
+ spin_lock(&c->erase_completion_lock);
+ jffs2_garbage_collect_trigger(c);
+ list_move(&jeb->list, &c->erase_complete_list);
+ spin_unlock(&c->erase_completion_lock);
+ mutex_unlock(&c->erase_free_sem);
+ return;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-17 05:14:18 +0000