| /* |
| * 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 1.75 2005/04/05 12:51:54 dedekind 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 (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) { |
| 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 && ic->nlink == 0) |
| jffs2_del_ino_cache(c, 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)) && (c->cleanmarker_size > 0)) { |
| 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; |
| |
| if (!jffs2_is_writebuffered(c) || !jffs2_cleanmarker_oob(c)) |
| ret = c->mtd->read(c->mtd, ofs, readlen, &retlen, ebuf); |
| else |
| ret = c->mtd->read_ecc(c->mtd, ofs, readlen, &retlen, ebuf, NULL, c->oobinfo); |
| |
| 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)) && (c->cleanmarker_size > 0)) |
| 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 if (c->cleanmarker_size == 0) { |
| 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 *) ▮ |
| 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); |
| } |
| |