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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/jffs2/erase.c | |
download | kernel_samsung_smdk4412-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip kernel_samsung_smdk4412-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz kernel_samsung_smdk4412-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 |
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!
Diffstat (limited to 'fs/jffs2/erase.c')
-rw-r--r-- | fs/jffs2/erase.c | 442 |
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 *) ▮ + 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); +} + |