--- /dev/null
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ * for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include "yaffs_yaffs1.h"
+#include "yportenv.h"
+#include "yaffs_trace.h"
+#include "yaffs_bitmap.h"
+#include "yaffs_getblockinfo.h"
+#include "yaffs_nand.h"
+
+
+int yaffs1_scan(yaffs_dev_t *dev)
+{
+ yaffs_ext_tags tags;
+ int blk;
+ int blockIterator;
+ int startIterator;
+ int endIterator;
+ int result;
+
+ int chunk;
+ int c;
+ int deleted;
+ yaffs_block_state_t state;
+ yaffs_obj_t *hard_list = NULL;
+ yaffs_block_info_t *bi;
+ __u32 seq_number;
+ yaffs_obj_header *oh;
+ yaffs_obj_t *in;
+ yaffs_obj_t *parent;
+
+ int alloc_failed = 0;
+
+ struct yaffs_shadow_fixer_s *shadowFixerList = NULL;
+
+
+ __u8 *chunkData;
+
+
+
+ T(YAFFS_TRACE_SCAN,
+ (TSTR("yaffs1_scan starts intstartblk %d intendblk %d..." TENDSTR),
+ dev->internal_start_block, dev->internal_end_block));
+
+ chunkData = yaffs_get_temp_buffer(dev, __LINE__);
+
+ dev->seq_number = YAFFS_LOWEST_SEQUENCE_NUMBER;
+
+ /* Scan all the blocks to determine their state */
+ bi = dev->block_info;
+ for (blk = dev->internal_start_block; blk <= dev->internal_end_block; blk++) {
+ yaffs_clear_chunk_bits(dev, blk);
+ bi->pages_in_use = 0;
+ bi->soft_del_pages = 0;
+
+ yaffs_query_init_block_state(dev, blk, &state, &seq_number);
+
+ bi->block_state = state;
+ bi->seq_number = seq_number;
+
+ if (bi->seq_number == YAFFS_SEQUENCE_BAD_BLOCK)
+ bi->block_state = state = YAFFS_BLOCK_STATE_DEAD;
+
+ T(YAFFS_TRACE_SCAN_DEBUG,
+ (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
+ state, seq_number));
+
+ if (state == YAFFS_BLOCK_STATE_DEAD) {
+ T(YAFFS_TRACE_BAD_BLOCKS,
+ (TSTR("block %d is bad" TENDSTR), blk));
+ } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
+ T(YAFFS_TRACE_SCAN_DEBUG,
+ (TSTR("Block empty " TENDSTR)));
+ dev->n_erased_blocks++;
+ dev->n_free_chunks += dev->param.chunks_per_block;
+ }
+ bi++;
+ }
+
+ startIterator = dev->internal_start_block;
+ endIterator = dev->internal_end_block;
+
+ /* For each block.... */
+ for (blockIterator = startIterator; !alloc_failed && blockIterator <= endIterator;
+ blockIterator++) {
+
+ YYIELD();
+
+ YYIELD();
+
+ blk = blockIterator;
+
+ bi = yaffs_get_block_info(dev, blk);
+ state = bi->block_state;
+
+ deleted = 0;
+
+ /* For each chunk in each block that needs scanning....*/
+ for (c = 0; !alloc_failed && c < dev->param.chunks_per_block &&
+ state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
+ /* Read the tags and decide what to do */
+ chunk = blk * dev->param.chunks_per_block + c;
+
+ result = yaffs_rd_chunk_tags_nand(dev, chunk, NULL,
+ &tags);
+
+ /* Let's have a good look at this chunk... */
+
+ if (tags.ecc_result == YAFFS_ECC_RESULT_UNFIXED || tags.is_deleted) {
+ /* YAFFS1 only...
+ * A deleted chunk
+ */
+ deleted++;
+ dev->n_free_chunks++;
+ /*T((" %d %d deleted\n",blk,c)); */
+ } else if (!tags.chunk_used) {
+ /* An unassigned chunk in the block
+ * This means that either the block is empty or
+ * this is the one being allocated from
+ */
+
+ if (c == 0) {
+ /* We're looking at the first chunk in the block so the block is unused */
+ state = YAFFS_BLOCK_STATE_EMPTY;
+ dev->n_erased_blocks++;
+ } else {
+ /* this is the block being allocated from */
+ T(YAFFS_TRACE_SCAN,
+ (TSTR
+ (" Allocating from %d %d" TENDSTR),
+ blk, c));
+ state = YAFFS_BLOCK_STATE_ALLOCATING;
+ dev->alloc_block = blk;
+ dev->alloc_page = c;
+ dev->alloc_block_finder = blk;
+ /* Set block finder here to encourage the allocator to go forth from here. */
+
+ }
+
+ dev->n_free_chunks += (dev->param.chunks_per_block - c);
+ } else if (tags.chunk_id > 0) {
+ /* chunk_id > 0 so it is a data chunk... */
+ unsigned int endpos;
+
+ yaffs_set_chunk_bit(dev, blk, c);
+ bi->pages_in_use++;
+
+ in = yaffs_find_or_create_by_number(dev,
+ tags.
+ obj_id,
+ YAFFS_OBJECT_TYPE_FILE);
+ /* PutChunkIntoFile checks for a clash (two data chunks with
+ * the same chunk_id).
+ */
+
+ if (!in)
+ alloc_failed = 1;
+
+ if (in) {
+ if (!yaffs_put_chunk_in_file(in, tags.chunk_id, chunk, 1))
+ alloc_failed = 1;
+ }
+
+ endpos =
+ (tags.chunk_id - 1) * dev->data_bytes_per_chunk +
+ tags.n_bytes;
+ if (in &&
+ in->variant_type == YAFFS_OBJECT_TYPE_FILE
+ && in->variant.file_variant.scanned_size <
+ endpos) {
+ in->variant.file_variant.
+ scanned_size = endpos;
+ if (!dev->param.use_header_file_size) {
+ in->variant.file_variant.
+ file_size =
+ in->variant.file_variant.
+ scanned_size;
+ }
+
+ }
+ /* T((" %d %d data %d %d\n",blk,c,tags.obj_id,tags.chunk_id)); */
+ } else {
+ /* chunk_id == 0, so it is an ObjectHeader.
+ * Thus, we read in the object header and make the object
+ */
+ yaffs_set_chunk_bit(dev, blk, c);
+ bi->pages_in_use++;
+
+ result = yaffs_rd_chunk_tags_nand(dev, chunk,
+ chunkData,
+ NULL);
+
+ oh = (yaffs_obj_header *) chunkData;
+
+ in = yaffs_find_by_number(dev,
+ tags.obj_id);
+ if (in && in->variant_type != oh->type) {
+ /* This should not happen, but somehow
+ * Wev'e ended up with an obj_id that has been reused but not yet
+ * deleted, and worse still it has changed type. Delete the old object.
+ */
+
+ yaffs_del_obj(in);
+
+ in = 0;
+ }
+
+ in = yaffs_find_or_create_by_number(dev,
+ tags.
+ obj_id,
+ oh->type);
+
+ if (!in)
+ alloc_failed = 1;
+
+ if (in && oh->shadows_obj > 0) {
+
+ struct yaffs_shadow_fixer_s *fixer;
+ fixer = YMALLOC(sizeof(struct yaffs_shadow_fixer_s));
+ if (fixer) {
+ fixer->next = shadowFixerList;
+ shadowFixerList = fixer;
+ fixer->obj_id = tags.obj_id;
+ fixer->shadowed_id = oh->shadows_obj;
+ T(YAFFS_TRACE_SCAN,
+ (TSTR
+ (" Shadow fixer: %d shadows %d" TENDSTR),
+ fixer->obj_id, fixer->shadowed_id));
+
+ }
+
+ }
+
+ if (in && in->valid) {
+ /* We have already filled this one. We have a duplicate and need to resolve it. */
+
+ unsigned existingSerial = in->serial;
+ unsigned newSerial = tags.serial_number;
+
+ if (((existingSerial + 1) & 3) == newSerial) {
+ /* Use new one - destroy the exisiting one */
+ yaffs_chunk_del(dev,
+ in->hdr_chunk,
+ 1, __LINE__);
+ in->valid = 0;
+ } else {
+ /* Use existing - destroy this one. */
+ yaffs_chunk_del(dev, chunk, 1,
+ __LINE__);
+ }
+ }
+
+ if (in && !in->valid &&
+ (tags.obj_id == YAFFS_OBJECTID_ROOT ||
+ tags.obj_id == YAFFS_OBJECTID_LOSTNFOUND)) {
+ /* We only load some info, don't fiddle with directory structure */
+ in->valid = 1;
+ in->variant_type = oh->type;
+
+ in->yst_mode = oh->yst_mode;
+#ifdef CONFIG_YAFFS_WINCE
+ in->win_atime[0] = oh->win_atime[0];
+ in->win_ctime[0] = oh->win_ctime[0];
+ in->win_mtime[0] = oh->win_mtime[0];
+ in->win_atime[1] = oh->win_atime[1];
+ in->win_ctime[1] = oh->win_ctime[1];
+ in->win_mtime[1] = oh->win_mtime[1];
+#else
+ in->yst_uid = oh->yst_uid;
+ in->yst_gid = oh->yst_gid;
+ in->yst_atime = oh->yst_atime;
+ in->yst_mtime = oh->yst_mtime;
+ in->yst_ctime = oh->yst_ctime;
+ in->yst_rdev = oh->yst_rdev;
+#endif
+ in->hdr_chunk = chunk;
+ in->serial = tags.serial_number;
+
+ } else if (in && !in->valid) {
+ /* we need to load this info */
+
+ in->valid = 1;
+ in->variant_type = oh->type;
+
+ in->yst_mode = oh->yst_mode;
+#ifdef CONFIG_YAFFS_WINCE
+ in->win_atime[0] = oh->win_atime[0];
+ in->win_ctime[0] = oh->win_ctime[0];
+ in->win_mtime[0] = oh->win_mtime[0];
+ in->win_atime[1] = oh->win_atime[1];
+ in->win_ctime[1] = oh->win_ctime[1];
+ in->win_mtime[1] = oh->win_mtime[1];
+#else
+ in->yst_uid = oh->yst_uid;
+ in->yst_gid = oh->yst_gid;
+ in->yst_atime = oh->yst_atime;
+ in->yst_mtime = oh->yst_mtime;
+ in->yst_ctime = oh->yst_ctime;
+ in->yst_rdev = oh->yst_rdev;
+#endif
+ in->hdr_chunk = chunk;
+ in->serial = tags.serial_number;
+
+ yaffs_set_obj_name_from_oh(in, oh);
+ in->dirty = 0;
+
+ /* directory stuff...
+ * hook up to parent
+ */
+
+ parent =
+ yaffs_find_or_create_by_number
+ (dev, oh->parent_obj_id,
+ YAFFS_OBJECT_TYPE_DIRECTORY);
+ if (!parent)
+ alloc_failed = 1;
+ if (parent && parent->variant_type ==
+ YAFFS_OBJECT_TYPE_UNKNOWN) {
+ /* Set up as a directory */
+ parent->variant_type =
+ YAFFS_OBJECT_TYPE_DIRECTORY;
+ YINIT_LIST_HEAD(&parent->variant.
+ dir_variant.
+ children);
+ } else if (!parent || parent->variant_type !=
+ YAFFS_OBJECT_TYPE_DIRECTORY) {
+ /* Hoosterman, another problem....
+ * We're trying to use a non-directory as a directory
+ */
+
+ T(YAFFS_TRACE_ERROR,
+ (TSTR
+ ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
+ TENDSTR)));
+ parent = dev->lost_n_found;
+ }
+
+ yaffs_add_obj_to_dir(parent, in);
+
+ if (0 && (parent == dev->del_dir ||
+ parent == dev->unlinked_dir)) {
+ in->deleted = 1; /* If it is unlinked at start up then it wants deleting */
+ dev->n_deleted_files++;
+ }
+ /* Note re hardlinks.
+ * Since we might scan a hardlink before its equivalent object is scanned
+ * we put them all in a list.
+ * After scanning is complete, we should have all the objects, so we run through this
+ * list and fix up all the chains.
+ */
+
+ switch (in->variant_type) {
+ case YAFFS_OBJECT_TYPE_UNKNOWN:
+ /* Todo got a problem */
+ break;
+ case YAFFS_OBJECT_TYPE_FILE:
+ if (dev->param.use_header_file_size)
+
+ in->variant.file_variant.
+ file_size =
+ oh->file_size;
+
+ break;
+ case YAFFS_OBJECT_TYPE_HARDLINK:
+ in->variant.hardlink_variant.
+ equiv_id =
+ oh->equiv_id;
+ in->hard_links.next =
+ (struct ylist_head *)
+ hard_list;
+ hard_list = in;
+ break;
+ case YAFFS_OBJECT_TYPE_DIRECTORY:
+ /* Do nothing */
+ break;
+ case YAFFS_OBJECT_TYPE_SPECIAL:
+ /* Do nothing */
+ break;
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ in->variant.symlink_variant.alias =
+ yaffs_clone_str(oh->alias);
+ if (!in->variant.symlink_variant.alias)
+ alloc_failed = 1;
+ break;
+ }
+
+ }
+ }
+ }
+
+ if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
+ /* If we got this far while scanning, then the block is fully allocated.*/
+ state = YAFFS_BLOCK_STATE_FULL;
+ }
+
+ if (state == YAFFS_BLOCK_STATE_ALLOCATING) {
+ /* If the block was partially allocated then treat it as fully allocated.*/
+ state = YAFFS_BLOCK_STATE_FULL;
+ dev->alloc_block = -1;
+ }
+
+ bi->block_state = state;
+
+ /* Now let's see if it was dirty */
+ if (bi->pages_in_use == 0 &&
+ !bi->has_shrink_hdr &&
+ bi->block_state == YAFFS_BLOCK_STATE_FULL) {
+ yaffs_block_became_dirty(dev, blk);
+ }
+
+ }
+
+
+ /* Ok, we've done all the scanning.
+ * Fix up the hard link chains.
+ * We should now have scanned all the objects, now it's time to add these
+ * hardlinks.
+ */
+
+ yaffs_link_fixup(dev, hard_list);
+
+ /* Fix up any shadowed objects */
+ {
+ struct yaffs_shadow_fixer_s *fixer;
+ yaffs_obj_t *obj;
+
+ while (shadowFixerList) {
+ fixer = shadowFixerList;
+ shadowFixerList = fixer->next;
+ /* Complete the rename transaction by deleting the shadowed object
+ * then setting the object header to unshadowed.
+ */
+ obj = yaffs_find_by_number(dev, fixer->shadowed_id);
+ if (obj)
+ yaffs_del_obj(obj);
+
+ obj = yaffs_find_by_number(dev, fixer->obj_id);
+
+ if (obj)
+ yaffs_update_oh(obj, NULL, 1, 0, 0, NULL);
+
+ YFREE(fixer);
+ }
+ }
+
+ yaffs_release_temp_buffer(dev, chunkData, __LINE__);
+
+ if (alloc_failed)
+ return YAFFS_FAIL;
+
+ T(YAFFS_TRACE_SCAN, (TSTR("yaffs1_scan ends" TENDSTR)));
+
+
+ return YAFFS_OK;
+}
+
projects / 15.05 / openwrt.git / blobdiff