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-rw-r--r--fs/yaffs2/yaffs_guts.c5164
1 files changed, 0 insertions, 5164 deletions
diff --git a/fs/yaffs2/yaffs_guts.c b/fs/yaffs2/yaffs_guts.c
deleted file mode 100644
index f4ae9de..0000000
--- a/fs/yaffs2/yaffs_guts.c
+++ /dev/null
@@ -1,5164 +0,0 @@
-/*
- * 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 "yportenv.h"
-#include "yaffs_trace.h"
-
-#include "yaffs_guts.h"
-#include "yaffs_tagsvalidity.h"
-#include "yaffs_getblockinfo.h"
-
-#include "yaffs_tagscompat.h"
-
-#include "yaffs_nand.h"
-
-#include "yaffs_yaffs1.h"
-#include "yaffs_yaffs2.h"
-#include "yaffs_bitmap.h"
-#include "yaffs_verify.h"
-
-#include "yaffs_nand.h"
-#include "yaffs_packedtags2.h"
-
-#include "yaffs_nameval.h"
-#include "yaffs_allocator.h"
-
-#include "yaffs_attribs.h"
-
-/* Note YAFFS_GC_GOOD_ENOUGH must be <= YAFFS_GC_PASSIVE_THRESHOLD */
-#define YAFFS_GC_GOOD_ENOUGH 2
-#define YAFFS_GC_PASSIVE_THRESHOLD 4
-
-#include "yaffs_ecc.h"
-
-/* Forward declarations */
-
-static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk,
- const u8 * buffer, int n_bytes, int use_reserve);
-
-
-
-/* Function to calculate chunk and offset */
-
-static void yaffs_addr_to_chunk(struct yaffs_dev *dev, loff_t addr,
- int *chunk_out, u32 * offset_out)
-{
- int chunk;
- u32 offset;
-
- chunk = (u32) (addr >> dev->chunk_shift);
-
- if (dev->chunk_div == 1) {
- /* easy power of 2 case */
- offset = (u32) (addr & dev->chunk_mask);
- } else {
- /* Non power-of-2 case */
-
- loff_t chunk_base;
-
- chunk /= dev->chunk_div;
-
- chunk_base = ((loff_t) chunk) * dev->data_bytes_per_chunk;
- offset = (u32) (addr - chunk_base);
- }
-
- *chunk_out = chunk;
- *offset_out = offset;
-}
-
-/* Function to return the number of shifts for a power of 2 greater than or
- * equal to the given number
- * Note we don't try to cater for all possible numbers and this does not have to
- * be hellishly efficient.
- */
-
-static u32 calc_shifts_ceiling(u32 x)
-{
- int extra_bits;
- int shifts;
-
- shifts = extra_bits = 0;
-
- while (x > 1) {
- if (x & 1)
- extra_bits++;
- x >>= 1;
- shifts++;
- }
-
- if (extra_bits)
- shifts++;
-
- return shifts;
-}
-
-/* Function to return the number of shifts to get a 1 in bit 0
- */
-
-static u32 calc_shifts(u32 x)
-{
- u32 shifts;
-
- shifts = 0;
-
- if (!x)
- return 0;
-
- while (!(x & 1)) {
- x >>= 1;
- shifts++;
- }
-
- return shifts;
-}
-
-/*
- * Temporary buffer manipulations.
- */
-
-static int yaffs_init_tmp_buffers(struct yaffs_dev *dev)
-{
- int i;
- u8 *buf = (u8 *) 1;
-
- memset(dev->temp_buffer, 0, sizeof(dev->temp_buffer));
-
- for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
- dev->temp_buffer[i].line = 0; /* not in use */
- dev->temp_buffer[i].buffer = buf =
- kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);
- }
-
- return buf ? YAFFS_OK : YAFFS_FAIL;
-}
-
-u8 *yaffs_get_temp_buffer(struct yaffs_dev * dev, int line_no)
-{
- int i, j;
-
- dev->temp_in_use++;
- if (dev->temp_in_use > dev->max_temp)
- dev->max_temp = dev->temp_in_use;
-
- for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
- if (dev->temp_buffer[i].line == 0) {
- dev->temp_buffer[i].line = line_no;
- if ((i + 1) > dev->max_temp) {
- dev->max_temp = i + 1;
- for (j = 0; j <= i; j++)
- dev->temp_buffer[j].max_line =
- dev->temp_buffer[j].line;
- }
-
- return dev->temp_buffer[i].buffer;
- }
- }
-
- yaffs_trace(YAFFS_TRACE_BUFFERS,
- "Out of temp buffers at line %d, other held by lines:",
- line_no);
- for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
- yaffs_trace(YAFFS_TRACE_BUFFERS," %d", dev->temp_buffer[i].line);
-
- /*
- * If we got here then we have to allocate an unmanaged one
- * This is not good.
- */
-
- dev->unmanaged_buffer_allocs++;
- return kmalloc(dev->data_bytes_per_chunk, GFP_NOFS);
-
-}
-
-void yaffs_release_temp_buffer(struct yaffs_dev *dev, u8 * buffer, int line_no)
-{
- int i;
-
- dev->temp_in_use--;
-
- for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
- if (dev->temp_buffer[i].buffer == buffer) {
- dev->temp_buffer[i].line = 0;
- return;
- }
- }
-
- if (buffer) {
- /* assume it is an unmanaged one. */
- yaffs_trace(YAFFS_TRACE_BUFFERS,
- "Releasing unmanaged temp buffer in line %d",
- line_no);
- kfree(buffer);
- dev->unmanaged_buffer_deallocs++;
- }
-
-}
-
-/*
- * Determine if we have a managed buffer.
- */
-int yaffs_is_managed_tmp_buffer(struct yaffs_dev *dev, const u8 * buffer)
-{
- int i;
-
- for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
- if (dev->temp_buffer[i].buffer == buffer)
- return 1;
- }
-
- for (i = 0; i < dev->param.n_caches; i++) {
- if (dev->cache[i].data == buffer)
- return 1;
- }
-
- if (buffer == dev->checkpt_buffer)
- return 1;
-
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "yaffs: unmaged buffer detected.");
- return 0;
-}
-
-/*
- * Functions for robustisizing TODO
- *
- */
-
-static void yaffs_handle_chunk_wr_ok(struct yaffs_dev *dev, int nand_chunk,
- const u8 * data,
- const struct yaffs_ext_tags *tags)
-{
- dev = dev;
- nand_chunk = nand_chunk;
- data = data;
- tags = tags;
-}
-
-static void yaffs_handle_chunk_update(struct yaffs_dev *dev, int nand_chunk,
- const struct yaffs_ext_tags *tags)
-{
- dev = dev;
- nand_chunk = nand_chunk;
- tags = tags;
-}
-
-void yaffs_handle_chunk_error(struct yaffs_dev *dev,
- struct yaffs_block_info *bi)
-{
- if (!bi->gc_prioritise) {
- bi->gc_prioritise = 1;
- dev->has_pending_prioritised_gc = 1;
- bi->chunk_error_strikes++;
-
- if (bi->chunk_error_strikes > 3) {
- bi->needs_retiring = 1; /* Too many stikes, so retire this */
- yaffs_trace(YAFFS_TRACE_ALWAYS, "yaffs: Block struck out");
-
- }
- }
-}
-
-static void yaffs_handle_chunk_wr_error(struct yaffs_dev *dev, int nand_chunk,
- int erased_ok)
-{
- int flash_block = nand_chunk / dev->param.chunks_per_block;
- struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block);
-
- yaffs_handle_chunk_error(dev, bi);
-
- if (erased_ok) {
- /* Was an actual write failure, so mark the block for retirement */
- bi->needs_retiring = 1;
- yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
- "**>> Block %d needs retiring", flash_block);
- }
-
- /* Delete the chunk */
- yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
- yaffs_skip_rest_of_block(dev);
-}
-
-/*
- * Verification code
- */
-
-/*
- * Simple hash function. Needs to have a reasonable spread
- */
-
-static inline int yaffs_hash_fn(int n)
-{
- n = abs(n);
- return n % YAFFS_NOBJECT_BUCKETS;
-}
-
-/*
- * Access functions to useful fake objects.
- * Note that root might have a presence in NAND if permissions are set.
- */
-
-struct yaffs_obj *yaffs_root(struct yaffs_dev *dev)
-{
- return dev->root_dir;
-}
-
-struct yaffs_obj *yaffs_lost_n_found(struct yaffs_dev *dev)
-{
- return dev->lost_n_found;
-}
-
-/*
- * Erased NAND checking functions
- */
-
-int yaffs_check_ff(u8 * buffer, int n_bytes)
-{
- /* Horrible, slow implementation */
- while (n_bytes--) {
- if (*buffer != 0xFF)
- return 0;
- buffer++;
- }
- return 1;
-}
-
-static int yaffs_check_chunk_erased(struct yaffs_dev *dev, int nand_chunk)
-{
- int retval = YAFFS_OK;
- u8 *data = yaffs_get_temp_buffer(dev, __LINE__);
- struct yaffs_ext_tags tags;
- int result;
-
- result = yaffs_rd_chunk_tags_nand(dev, nand_chunk, data, &tags);
-
- if (tags.ecc_result > YAFFS_ECC_RESULT_NO_ERROR)
- retval = YAFFS_FAIL;
-
- if (!yaffs_check_ff(data, dev->data_bytes_per_chunk) ||
- tags.chunk_used) {
- yaffs_trace(YAFFS_TRACE_NANDACCESS, "Chunk %d not erased", nand_chunk);
- retval = YAFFS_FAIL;
- }
-
- yaffs_release_temp_buffer(dev, data, __LINE__);
-
- return retval;
-
-}
-
-static int yaffs_verify_chunk_written(struct yaffs_dev *dev,
- int nand_chunk,
- const u8 * data,
- struct yaffs_ext_tags *tags)
-{
- int retval = YAFFS_OK;
- struct yaffs_ext_tags temp_tags;
- u8 *buffer = yaffs_get_temp_buffer(dev, __LINE__);
- int result;
-
- result = yaffs_rd_chunk_tags_nand(dev, nand_chunk, buffer, &temp_tags);
- if (memcmp(buffer, data, dev->data_bytes_per_chunk) ||
- temp_tags.obj_id != tags->obj_id ||
- temp_tags.chunk_id != tags->chunk_id ||
- temp_tags.n_bytes != tags->n_bytes)
- retval = YAFFS_FAIL;
-
- yaffs_release_temp_buffer(dev, buffer, __LINE__);
-
- return retval;
-}
-
-
-int yaffs_check_alloc_available(struct yaffs_dev *dev, int n_chunks)
-{
- int reserved_chunks;
- int reserved_blocks = dev->param.n_reserved_blocks;
- int checkpt_blocks;
-
- checkpt_blocks = yaffs_calc_checkpt_blocks_required(dev);
-
- reserved_chunks =
- ((reserved_blocks + checkpt_blocks) * dev->param.chunks_per_block);
-
- return (dev->n_free_chunks > (reserved_chunks + n_chunks));
-}
-
-static int yaffs_find_alloc_block(struct yaffs_dev *dev)
-{
- int i;
-
- struct yaffs_block_info *bi;
-
- if (dev->n_erased_blocks < 1) {
- /* Hoosterman we've got a problem.
- * Can't get space to gc
- */
- yaffs_trace(YAFFS_TRACE_ERROR,
- "yaffs tragedy: no more erased blocks" );
-
- return -1;
- }
-
- /* Find an empty block. */
-
- for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
- dev->alloc_block_finder++;
- if (dev->alloc_block_finder < dev->internal_start_block
- || dev->alloc_block_finder > dev->internal_end_block) {
- dev->alloc_block_finder = dev->internal_start_block;
- }
-
- bi = yaffs_get_block_info(dev, dev->alloc_block_finder);
-
- if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) {
- bi->block_state = YAFFS_BLOCK_STATE_ALLOCATING;
- dev->seq_number++;
- bi->seq_number = dev->seq_number;
- dev->n_erased_blocks--;
- yaffs_trace(YAFFS_TRACE_ALLOCATE,
- "Allocated block %d, seq %d, %d left" ,
- dev->alloc_block_finder, dev->seq_number,
- dev->n_erased_blocks);
- return dev->alloc_block_finder;
- }
- }
-
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "yaffs tragedy: no more erased blocks, but there should have been %d",
- dev->n_erased_blocks);
-
- return -1;
-}
-
-static int yaffs_alloc_chunk(struct yaffs_dev *dev, int use_reserver,
- struct yaffs_block_info **block_ptr)
-{
- int ret_val;
- struct yaffs_block_info *bi;
-
- if (dev->alloc_block < 0) {
- /* Get next block to allocate off */
- dev->alloc_block = yaffs_find_alloc_block(dev);
- dev->alloc_page = 0;
- }
-
- if (!use_reserver && !yaffs_check_alloc_available(dev, 1)) {
- /* Not enough space to allocate unless we're allowed to use the reserve. */
- return -1;
- }
-
- if (dev->n_erased_blocks < dev->param.n_reserved_blocks
- && dev->alloc_page == 0)
- yaffs_trace(YAFFS_TRACE_ALLOCATE, "Allocating reserve");
-
- /* Next page please.... */
- if (dev->alloc_block >= 0) {
- bi = yaffs_get_block_info(dev, dev->alloc_block);
-
- ret_val = (dev->alloc_block * dev->param.chunks_per_block) +
- dev->alloc_page;
- bi->pages_in_use++;
- yaffs_set_chunk_bit(dev, dev->alloc_block, dev->alloc_page);
-
- dev->alloc_page++;
-
- dev->n_free_chunks--;
-
- /* If the block is full set the state to full */
- if (dev->alloc_page >= dev->param.chunks_per_block) {
- bi->block_state = YAFFS_BLOCK_STATE_FULL;
- dev->alloc_block = -1;
- }
-
- if (block_ptr)
- *block_ptr = bi;
-
- return ret_val;
- }
-
- yaffs_trace(YAFFS_TRACE_ERROR, "!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" );
-
- return -1;
-}
-
-static int yaffs_get_erased_chunks(struct yaffs_dev *dev)
-{
- int n;
-
- n = dev->n_erased_blocks * dev->param.chunks_per_block;
-
- if (dev->alloc_block > 0)
- n += (dev->param.chunks_per_block - dev->alloc_page);
-
- return n;
-
-}
-
-/*
- * yaffs_skip_rest_of_block() skips over the rest of the allocation block
- * if we don't want to write to it.
- */
-void yaffs_skip_rest_of_block(struct yaffs_dev *dev)
-{
- if (dev->alloc_block > 0) {
- struct yaffs_block_info *bi =
- yaffs_get_block_info(dev, dev->alloc_block);
- if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING) {
- bi->block_state = YAFFS_BLOCK_STATE_FULL;
- dev->alloc_block = -1;
- }
- }
-}
-
-static int yaffs_write_new_chunk(struct yaffs_dev *dev,
- const u8 * data,
- struct yaffs_ext_tags *tags, int use_reserver)
-{
- int attempts = 0;
- int write_ok = 0;
- int chunk;
-
- yaffs2_checkpt_invalidate(dev);
-
- do {
- struct yaffs_block_info *bi = 0;
- int erased_ok = 0;
-
- chunk = yaffs_alloc_chunk(dev, use_reserver, &bi);
- if (chunk < 0) {
- /* no space */
- break;
- }
-
- /* First check this chunk is erased, if it needs
- * checking. The checking policy (unless forced
- * always on) is as follows:
- *
- * Check the first page we try to write in a block.
- * If the check passes then we don't need to check any
- * more. If the check fails, we check again...
- * If the block has been erased, we don't need to check.
- *
- * However, if the block has been prioritised for gc,
- * then we think there might be something odd about
- * this block and stop using it.
- *
- * Rationale: We should only ever see chunks that have
- * not been erased if there was a partially written
- * chunk due to power loss. This checking policy should
- * catch that case with very few checks and thus save a
- * lot of checks that are most likely not needed.
- *
- * Mods to the above
- * If an erase check fails or the write fails we skip the
- * rest of the block.
- */
-
- /* let's give it a try */
- attempts++;
-
- if (dev->param.always_check_erased)
- bi->skip_erased_check = 0;
-
- if (!bi->skip_erased_check) {
- erased_ok = yaffs_check_chunk_erased(dev, chunk);
- if (erased_ok != YAFFS_OK) {
- yaffs_trace(YAFFS_TRACE_ERROR,
- "**>> yaffs chunk %d was not erased",
- chunk);
-
- /* If not erased, delete this one,
- * skip rest of block and
- * try another chunk */
- yaffs_chunk_del(dev, chunk, 1, __LINE__);
- yaffs_skip_rest_of_block(dev);
- continue;
- }
- }
-
- write_ok = yaffs_wr_chunk_tags_nand(dev, chunk, data, tags);
-
- if (!bi->skip_erased_check)
- write_ok =
- yaffs_verify_chunk_written(dev, chunk, data, tags);
-
- if (write_ok != YAFFS_OK) {
- /* Clean up aborted write, skip to next block and
- * try another chunk */
- yaffs_handle_chunk_wr_error(dev, chunk, erased_ok);
- continue;
- }
-
- bi->skip_erased_check = 1;
-
- /* Copy the data into the robustification buffer */
- yaffs_handle_chunk_wr_ok(dev, chunk, data, tags);
-
- } while (write_ok != YAFFS_OK &&
- (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
-
- if (!write_ok)
- chunk = -1;
-
- if (attempts > 1) {
- yaffs_trace(YAFFS_TRACE_ERROR,
- "**>> yaffs write required %d attempts",
- attempts);
- dev->n_retired_writes += (attempts - 1);
- }
-
- return chunk;
-}
-
-/*
- * Block retiring for handling a broken block.
- */
-
-static void yaffs_retire_block(struct yaffs_dev *dev, int flash_block)
-{
- struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block);
-
- yaffs2_checkpt_invalidate(dev);
-
- yaffs2_clear_oldest_dirty_seq(dev, bi);
-
- if (yaffs_mark_bad(dev, flash_block) != YAFFS_OK) {
- if (yaffs_erase_block(dev, flash_block) != YAFFS_OK) {
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "yaffs: Failed to mark bad and erase block %d",
- flash_block);
- } else {
- struct yaffs_ext_tags tags;
- int chunk_id =
- flash_block * dev->param.chunks_per_block;
-
- u8 *buffer = yaffs_get_temp_buffer(dev, __LINE__);
-
- memset(buffer, 0xff, dev->data_bytes_per_chunk);
- yaffs_init_tags(&tags);
- tags.seq_number = YAFFS_SEQUENCE_BAD_BLOCK;
- if (dev->param.write_chunk_tags_fn(dev, chunk_id -
- dev->chunk_offset,
- buffer,
- &tags) != YAFFS_OK)
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "yaffs: Failed to write bad block marker to block %d",
- flash_block);
-
- yaffs_release_temp_buffer(dev, buffer, __LINE__);
- }
- }
-
- bi->block_state = YAFFS_BLOCK_STATE_DEAD;
- bi->gc_prioritise = 0;
- bi->needs_retiring = 0;
-
- dev->n_retired_blocks++;
-}
-
-/*---------------- Name handling functions ------------*/
-
-static u16 yaffs_calc_name_sum(const YCHAR * name)
-{
- u16 sum = 0;
- u16 i = 1;
-
- const YUCHAR *bname = (const YUCHAR *)name;
- if (bname) {
- while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH / 2))) {
-
- /* 0x1f mask is case insensitive */
- sum += ((*bname) & 0x1f) * i;
- i++;
- bname++;
- }
- }
- return sum;
-}
-
-void yaffs_set_obj_name(struct yaffs_obj *obj, const YCHAR * name)
-{
-#ifndef CONFIG_YAFFS_NO_SHORT_NAMES
- memset(obj->short_name, 0, sizeof(obj->short_name));
- if (name &&
- strnlen(name, YAFFS_SHORT_NAME_LENGTH + 1) <=
- YAFFS_SHORT_NAME_LENGTH)
- strcpy(obj->short_name, name);
- else
- obj->short_name[0] = _Y('\0');
-#endif
- obj->sum = yaffs_calc_name_sum(name);
-}
-
-void yaffs_set_obj_name_from_oh(struct yaffs_obj *obj,
- const struct yaffs_obj_hdr *oh)
-{
-#ifdef CONFIG_YAFFS_AUTO_UNICODE
- YCHAR tmp_name[YAFFS_MAX_NAME_LENGTH + 1];
- memset(tmp_name, 0, sizeof(tmp_name));
- yaffs_load_name_from_oh(obj->my_dev, tmp_name, oh->name,
- YAFFS_MAX_NAME_LENGTH + 1);
- yaffs_set_obj_name(obj, tmp_name);
-#else
- yaffs_set_obj_name(obj, oh->name);
-#endif
-}
-
-/*-------------------- TNODES -------------------
-
- * List of spare tnodes
- * The list is hooked together using the first pointer
- * in the tnode.
- */
-
-struct yaffs_tnode *yaffs_get_tnode(struct yaffs_dev *dev)
-{
- struct yaffs_tnode *tn = yaffs_alloc_raw_tnode(dev);
- if (tn) {
- memset(tn, 0, dev->tnode_size);
- dev->n_tnodes++;
- }
-
- dev->checkpoint_blocks_required = 0; /* force recalculation */
-
- return tn;
-}
-
-/* FreeTnode frees up a tnode and puts it back on the free list */
-static void yaffs_free_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn)
-{
- yaffs_free_raw_tnode(dev, tn);
- dev->n_tnodes--;
- dev->checkpoint_blocks_required = 0; /* force recalculation */
-}
-
-static void yaffs_deinit_tnodes_and_objs(struct yaffs_dev *dev)
-{
- yaffs_deinit_raw_tnodes_and_objs(dev);
- dev->n_obj = 0;
- dev->n_tnodes = 0;
-}
-
-void yaffs_load_tnode_0(struct yaffs_dev *dev, struct yaffs_tnode *tn,
- unsigned pos, unsigned val)
-{
- u32 *map = (u32 *) tn;
- u32 bit_in_map;
- u32 bit_in_word;
- u32 word_in_map;
- u32 mask;
-
- pos &= YAFFS_TNODES_LEVEL0_MASK;
- val >>= dev->chunk_grp_bits;
-
- bit_in_map = pos * dev->tnode_width;
- word_in_map = bit_in_map / 32;
- bit_in_word = bit_in_map & (32 - 1);
-
- mask = dev->tnode_mask << bit_in_word;
-
- map[word_in_map] &= ~mask;
- map[word_in_map] |= (mask & (val << bit_in_word));
-
- if (dev->tnode_width > (32 - bit_in_word)) {
- bit_in_word = (32 - bit_in_word);
- word_in_map++;;
- mask =
- dev->tnode_mask >> ( /*dev->tnode_width - */ bit_in_word);
- map[word_in_map] &= ~mask;
- map[word_in_map] |= (mask & (val >> bit_in_word));
- }
-}
-
-u32 yaffs_get_group_base(struct yaffs_dev *dev, struct yaffs_tnode *tn,
- unsigned pos)
-{
- u32 *map = (u32 *) tn;
- u32 bit_in_map;
- u32 bit_in_word;
- u32 word_in_map;
- u32 val;
-
- pos &= YAFFS_TNODES_LEVEL0_MASK;
-
- bit_in_map = pos * dev->tnode_width;
- word_in_map = bit_in_map / 32;
- bit_in_word = bit_in_map & (32 - 1);
-
- val = map[word_in_map] >> bit_in_word;
-
- if (dev->tnode_width > (32 - bit_in_word)) {
- bit_in_word = (32 - bit_in_word);
- word_in_map++;;
- val |= (map[word_in_map] << bit_in_word);
- }
-
- val &= dev->tnode_mask;
- val <<= dev->chunk_grp_bits;
-
- return val;
-}
-
-/* ------------------- End of individual tnode manipulation -----------------*/
-
-/* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
- * The look up tree is represented by the top tnode and the number of top_level
- * in the tree. 0 means only the level 0 tnode is in the tree.
- */
-
-/* FindLevel0Tnode finds the level 0 tnode, if one exists. */
-struct yaffs_tnode *yaffs_find_tnode_0(struct yaffs_dev *dev,
- struct yaffs_file_var *file_struct,
- u32 chunk_id)
-{
- struct yaffs_tnode *tn = file_struct->top;
- u32 i;
- int required_depth;
- int level = file_struct->top_level;
-
- dev = dev;
-
- /* Check sane level and chunk Id */
- if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
- return NULL;
-
- if (chunk_id > YAFFS_MAX_CHUNK_ID)
- return NULL;
-
- /* First check we're tall enough (ie enough top_level) */
-
- i = chunk_id >> YAFFS_TNODES_LEVEL0_BITS;
- required_depth = 0;
- while (i) {
- i >>= YAFFS_TNODES_INTERNAL_BITS;
- required_depth++;
- }
-
- if (required_depth > file_struct->top_level)
- return NULL; /* Not tall enough, so we can't find it */
-
- /* Traverse down to level 0 */
- while (level > 0 && tn) {
- tn = tn->internal[(chunk_id >>
- (YAFFS_TNODES_LEVEL0_BITS +
- (level - 1) *
- YAFFS_TNODES_INTERNAL_BITS)) &
- YAFFS_TNODES_INTERNAL_MASK];
- level--;
- }
-
- return tn;
-}
-
-/* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
- * This happens in two steps:
- * 1. If the tree isn't tall enough, then make it taller.
- * 2. Scan down the tree towards the level 0 tnode adding tnodes if required.
- *
- * Used when modifying the tree.
- *
- * If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
- * be plugged into the ttree.
- */
-
-struct yaffs_tnode *yaffs_add_find_tnode_0(struct yaffs_dev *dev,
- struct yaffs_file_var *file_struct,
- u32 chunk_id,
- struct yaffs_tnode *passed_tn)
-{
- int required_depth;
- int i;
- int l;
- struct yaffs_tnode *tn;
-
- u32 x;
-
- /* Check sane level and page Id */
- if (file_struct->top_level < 0
- || file_struct->top_level > YAFFS_TNODES_MAX_LEVEL)
- return NULL;
-
- if (chunk_id > YAFFS_MAX_CHUNK_ID)
- return NULL;
-
- /* First check we're tall enough (ie enough top_level) */
-
- x = chunk_id >> YAFFS_TNODES_LEVEL0_BITS;
- required_depth = 0;
- while (x) {
- x >>= YAFFS_TNODES_INTERNAL_BITS;
- required_depth++;
- }
-
- if (required_depth > file_struct->top_level) {
- /* Not tall enough, gotta make the tree taller */
- for (i = file_struct->top_level; i < required_depth; i++) {
-
- tn = yaffs_get_tnode(dev);
-
- if (tn) {
- tn->internal[0] = file_struct->top;
- file_struct->top = tn;
- file_struct->top_level++;
- } else {
- yaffs_trace(YAFFS_TRACE_ERROR, "yaffs: no more tnodes");
- return NULL;
- }
- }
- }
-
- /* Traverse down to level 0, adding anything we need */
-
- l = file_struct->top_level;
- tn = file_struct->top;
-
- if (l > 0) {
- while (l > 0 && tn) {
- x = (chunk_id >>
- (YAFFS_TNODES_LEVEL0_BITS +
- (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
- YAFFS_TNODES_INTERNAL_MASK;
-
- if ((l > 1) && !tn->internal[x]) {
- /* Add missing non-level-zero tnode */
- tn->internal[x] = yaffs_get_tnode(dev);
- if (!tn->internal[x])
- return NULL;
- } else if (l == 1) {
- /* Looking from level 1 at level 0 */
- if (passed_tn) {
- /* If we already have one, then release it. */
- if (tn->internal[x])
- yaffs_free_tnode(dev,
- tn->
- internal[x]);
- tn->internal[x] = passed_tn;
-
- } else if (!tn->internal[x]) {
- /* Don't have one, none passed in */
- tn->internal[x] = yaffs_get_tnode(dev);
- if (!tn->internal[x])
- return NULL;
- }
- }
-
- tn = tn->internal[x];
- l--;
- }
- } else {
- /* top is level 0 */
- if (passed_tn) {
- memcpy(tn, passed_tn,
- (dev->tnode_width * YAFFS_NTNODES_LEVEL0) / 8);
- yaffs_free_tnode(dev, passed_tn);
- }
- }
-
- return tn;
-}
-
-static int yaffs_tags_match(const struct yaffs_ext_tags *tags, int obj_id,
- int chunk_obj)
-{
- return (tags->chunk_id == chunk_obj &&
- tags->obj_id == obj_id && !tags->is_deleted) ? 1 : 0;
-
-}
-
-static int yaffs_find_chunk_in_group(struct yaffs_dev *dev, int the_chunk,
- struct yaffs_ext_tags *tags, int obj_id,
- int inode_chunk)
-{
- int j;
-
- for (j = 0; the_chunk && j < dev->chunk_grp_size; j++) {
- if (yaffs_check_chunk_bit
- (dev, the_chunk / dev->param.chunks_per_block,
- the_chunk % dev->param.chunks_per_block)) {
-
- if (dev->chunk_grp_size == 1)
- return the_chunk;
- else {
- yaffs_rd_chunk_tags_nand(dev, the_chunk, NULL,
- tags);
- if (yaffs_tags_match(tags, obj_id, inode_chunk)) {
- /* found it; */
- return the_chunk;
- }
- }
- }
- the_chunk++;
- }
- return -1;
-}
-
-static int yaffs_find_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
- struct yaffs_ext_tags *tags)
-{
- /*Get the Tnode, then get the level 0 offset chunk offset */
- struct yaffs_tnode *tn;
- int the_chunk = -1;
- struct yaffs_ext_tags local_tags;
- int ret_val = -1;
-
- struct yaffs_dev *dev = in->my_dev;
-
- if (!tags) {
- /* Passed a NULL, so use our own tags space */
- tags = &local_tags;
- }
-
- tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
-
- if (tn) {
- the_chunk = yaffs_get_group_base(dev, tn, inode_chunk);
-
- ret_val =
- yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id,
- inode_chunk);
- }
- return ret_val;
-}
-
-static int yaffs_find_del_file_chunk(struct yaffs_obj *in, int inode_chunk,
- struct yaffs_ext_tags *tags)
-{
- /* Get the Tnode, then get the level 0 offset chunk offset */
- struct yaffs_tnode *tn;
- int the_chunk = -1;
- struct yaffs_ext_tags local_tags;
-
- struct yaffs_dev *dev = in->my_dev;
- int ret_val = -1;
-
- if (!tags) {
- /* Passed a NULL, so use our own tags space */
- tags = &local_tags;
- }
-
- tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
-
- if (tn) {
-
- the_chunk = yaffs_get_group_base(dev, tn, inode_chunk);
-
- ret_val =
- yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id,
- inode_chunk);
-
- /* Delete the entry in the filestructure (if found) */
- if (ret_val != -1)
- yaffs_load_tnode_0(dev, tn, inode_chunk, 0);
- }
-
- return ret_val;
-}
-
-int yaffs_put_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
- int nand_chunk, int in_scan)
-{
- /* NB in_scan is zero unless scanning.
- * For forward scanning, in_scan is > 0;
- * for backward scanning in_scan is < 0
- *
- * nand_chunk = 0 is a dummy insert to make sure the tnodes are there.
- */
-
- struct yaffs_tnode *tn;
- struct yaffs_dev *dev = in->my_dev;
- int existing_cunk;
- struct yaffs_ext_tags existing_tags;
- struct yaffs_ext_tags new_tags;
- unsigned existing_serial, new_serial;
-
- if (in->variant_type != YAFFS_OBJECT_TYPE_FILE) {
- /* Just ignore an attempt at putting a chunk into a non-file during scanning
- * If it is not during Scanning then something went wrong!
- */
- if (!in_scan) {
- yaffs_trace(YAFFS_TRACE_ERROR,
- "yaffs tragedy:attempt to put data chunk into a non-file"
- );
- YBUG();
- }
-
- yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
- return YAFFS_OK;
- }
-
- tn = yaffs_add_find_tnode_0(dev,
- &in->variant.file_variant,
- inode_chunk, NULL);
- if (!tn)
- return YAFFS_FAIL;
-
- if (!nand_chunk)
- /* Dummy insert, bail now */
- return YAFFS_OK;
-
- existing_cunk = yaffs_get_group_base(dev, tn, inode_chunk);
-
- if (in_scan != 0) {
- /* If we're scanning then we need to test for duplicates
- * NB This does not need to be efficient since it should only ever
- * happen when the power fails during a write, then only one
- * chunk should ever be affected.
- *
- * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
- * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
- */
-
- if (existing_cunk > 0) {
- /* NB Right now existing chunk will not be real chunk_id if the chunk group size > 1
- * thus we have to do a FindChunkInFile to get the real chunk id.
- *
- * We have a duplicate now we need to decide which one to use:
- *
- * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
- * Forward scanning YAFFS2: The new one is what we use, dump the old one.
- * YAFFS1: Get both sets of tags and compare serial numbers.
- */
-
- if (in_scan > 0) {
- /* Only do this for forward scanning */
- yaffs_rd_chunk_tags_nand(dev,
- nand_chunk,
- NULL, &new_tags);
-
- /* Do a proper find */
- existing_cunk =
- yaffs_find_chunk_in_file(in, inode_chunk,
- &existing_tags);
- }
-
- if (existing_cunk <= 0) {
- /*Hoosterman - how did this happen? */
-
- yaffs_trace(YAFFS_TRACE_ERROR,
- "yaffs tragedy: existing chunk < 0 in scan"
- );
-
- }
-
- /* NB The deleted flags should be false, otherwise the chunks will
- * not be loaded during a scan
- */
-
- if (in_scan > 0) {
- new_serial = new_tags.serial_number;
- existing_serial = existing_tags.serial_number;
- }
-
- if ((in_scan > 0) &&
- (existing_cunk <= 0 ||
- ((existing_serial + 1) & 3) == new_serial)) {
- /* Forward scanning.
- * Use new
- * Delete the old one and drop through to update the tnode
- */
- yaffs_chunk_del(dev, existing_cunk, 1,
- __LINE__);
- } else {
- /* Backward scanning or we want to use the existing one
- * Use existing.
- * Delete the new one and return early so that the tnode isn't changed
- */
- yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
- return YAFFS_OK;
- }
- }
-
- }
-
- if (existing_cunk == 0)
- in->n_data_chunks++;
-
- yaffs_load_tnode_0(dev, tn, inode_chunk, nand_chunk);
-
- return YAFFS_OK;
-}
-
-static void yaffs_soft_del_chunk(struct yaffs_dev *dev, int chunk)
-{
- struct yaffs_block_info *the_block;
- unsigned block_no;
-
- yaffs_trace(YAFFS_TRACE_DELETION, "soft delete chunk %d", chunk);
-
- block_no = chunk / dev->param.chunks_per_block;
- the_block = yaffs_get_block_info(dev, block_no);
- if (the_block) {
- the_block->soft_del_pages++;
- dev->n_free_chunks++;
- yaffs2_update_oldest_dirty_seq(dev, block_no, the_block);
- }
-}
-
-/* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
- * All soft deleting does is increment the block's softdelete count and pulls the chunk out
- * of the tnode.
- * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
- */
-
-static int yaffs_soft_del_worker(struct yaffs_obj *in, struct yaffs_tnode *tn,
- u32 level, int chunk_offset)
-{
- int i;
- int the_chunk;
- int all_done = 1;
- struct yaffs_dev *dev = in->my_dev;
-
- if (tn) {
- if (level > 0) {
-
- for (i = YAFFS_NTNODES_INTERNAL - 1; all_done && i >= 0;
- i--) {
- if (tn->internal[i]) {
- all_done =
- yaffs_soft_del_worker(in,
- tn->internal
- [i],
- level - 1,
- (chunk_offset
- <<
- YAFFS_TNODES_INTERNAL_BITS)
- + i);
- if (all_done) {
- yaffs_free_tnode(dev,
- tn->internal
- [i]);
- tn->internal[i] = NULL;
- } else {
- /* Hoosterman... how could this happen? */
- }
- }
- }
- return (all_done) ? 1 : 0;
- } else if (level == 0) {
-
- for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
- the_chunk = yaffs_get_group_base(dev, tn, i);
- if (the_chunk) {
- /* Note this does not find the real chunk, only the chunk group.
- * We make an assumption that a chunk group is not larger than
- * a block.
- */
- yaffs_soft_del_chunk(dev, the_chunk);
- yaffs_load_tnode_0(dev, tn, i, 0);
- }
-
- }
- return 1;
-
- }
-
- }
-
- return 1;
-
-}
-
-static void yaffs_remove_obj_from_dir(struct yaffs_obj *obj)
-{
- struct yaffs_dev *dev = obj->my_dev;
- struct yaffs_obj *parent;
-
- yaffs_verify_obj_in_dir(obj);
- parent = obj->parent;
-
- yaffs_verify_dir(parent);
-
- if (dev && dev->param.remove_obj_fn)
- dev->param.remove_obj_fn(obj);
-
- list_del_init(&obj->siblings);
- obj->parent = NULL;
-
- yaffs_verify_dir(parent);
-}
-
-void yaffs_add_obj_to_dir(struct yaffs_obj *directory, struct yaffs_obj *obj)
-{
- if (!directory) {
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "tragedy: Trying to add an object to a null pointer directory"
- );
- YBUG();
- return;
- }
- if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "tragedy: Trying to add an object to a non-directory"
- );
- YBUG();
- }
-
- if (obj->siblings.prev == NULL) {
- /* Not initialised */
- YBUG();
- }
-
- yaffs_verify_dir(directory);
-
- yaffs_remove_obj_from_dir(obj);
-
- /* Now add it */
- list_add(&obj->siblings, &directory->variant.dir_variant.children);
- obj->parent = directory;
-
- if (directory == obj->my_dev->unlinked_dir
- || directory == obj->my_dev->del_dir) {
- obj->unlinked = 1;
- obj->my_dev->n_unlinked_files++;
- obj->rename_allowed = 0;
- }
-
- yaffs_verify_dir(directory);
- yaffs_verify_obj_in_dir(obj);
-}
-
-static int yaffs_change_obj_name(struct yaffs_obj *obj,
- struct yaffs_obj *new_dir,
- const YCHAR * new_name, int force, int shadows)
-{
- int unlink_op;
- int del_op;
-
- struct yaffs_obj *existing_target;
-
- if (new_dir == NULL)
- new_dir = obj->parent; /* use the old directory */
-
- if (new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "tragedy: yaffs_change_obj_name: new_dir is not a directory"
- );
- YBUG();
- }
-
- /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
- if (obj->my_dev->param.is_yaffs2)
- unlink_op = (new_dir == obj->my_dev->unlinked_dir);
- else
- unlink_op = (new_dir == obj->my_dev->unlinked_dir
- && obj->variant_type == YAFFS_OBJECT_TYPE_FILE);
-
- del_op = (new_dir == obj->my_dev->del_dir);
-
- existing_target = yaffs_find_by_name(new_dir, new_name);
-
- /* If the object is a file going into the unlinked directory,
- * then it is OK to just stuff it in since duplicate names are allowed.
- * else only proceed if the new name does not exist and if we're putting
- * it into a directory.
- */
- if ((unlink_op ||
- del_op ||
- force ||
- (shadows > 0) ||
- !existing_target) &&
- new_dir->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) {
- yaffs_set_obj_name(obj, new_name);
- obj->dirty = 1;
-
- yaffs_add_obj_to_dir(new_dir, obj);
-
- if (unlink_op)
- obj->unlinked = 1;
-
- /* If it is a deletion then we mark it as a shrink for gc purposes. */
- if (yaffs_update_oh(obj, new_name, 0, del_op, shadows, NULL) >=
- 0)
- return YAFFS_OK;
- }
-
- return YAFFS_FAIL;
-}
-
-/*------------------------ Short Operations Cache ----------------------------------------
- * In many situations where there is no high level buffering a lot of
- * reads might be short sequential reads, and a lot of writes may be short
- * sequential writes. eg. scanning/writing a jpeg file.
- * In these cases, a short read/write cache can provide a huge perfomance
- * benefit with dumb-as-a-rock code.
- * In Linux, the page cache provides read buffering and the short op cache
- * provides write buffering.
- *
- * There are a limited number (~10) of cache chunks per device so that we don't
- * need a very intelligent search.
- */
-
-static int yaffs_obj_cache_dirty(struct yaffs_obj *obj)
-{
- struct yaffs_dev *dev = obj->my_dev;
- int i;
- struct yaffs_cache *cache;
- int n_caches = obj->my_dev->param.n_caches;
-
- for (i = 0; i < n_caches; i++) {
- cache = &dev->cache[i];
- if (cache->object == obj && cache->dirty)
- return 1;
- }
-
- return 0;
-}
-
-static void yaffs_flush_file_cache(struct yaffs_obj *obj)
-{
- struct yaffs_dev *dev = obj->my_dev;
- int lowest = -99; /* Stop compiler whining. */
- int i;
- struct yaffs_cache *cache;
- int chunk_written = 0;
- int n_caches = obj->my_dev->param.n_caches;
-
- if (n_caches > 0) {
- do {
- cache = NULL;
-
- /* Find the dirty cache for this object with the lowest chunk id. */
- for (i = 0; i < n_caches; i++) {
- if (dev->cache[i].object == obj &&
- dev->cache[i].dirty) {
- if (!cache
- || dev->cache[i].chunk_id <
- lowest) {
- cache = &dev->cache[i];
- lowest = cache->chunk_id;
- }
- }
- }
-
- if (cache && !cache->locked) {
- /* Write it out and free it up */
-
- chunk_written =
- yaffs_wr_data_obj(cache->object,
- cache->chunk_id,
- cache->data,
- cache->n_bytes, 1);
- cache->dirty = 0;
- cache->object = NULL;
- }
-
- } while (cache && chunk_written > 0);
-
- if (cache)
- /* Hoosterman, disk full while writing cache out. */
- yaffs_trace(YAFFS_TRACE_ERROR,
- "yaffs tragedy: no space during cache write");
-
- }
-
-}
-
-/*yaffs_flush_whole_cache(dev)
- *
- *
- */
-
-void yaffs_flush_whole_cache(struct yaffs_dev *dev)
-{
- struct yaffs_obj *obj;
- int n_caches = dev->param.n_caches;
- int i;
-
- /* Find a dirty object in the cache and flush it...
- * until there are no further dirty objects.
- */
- do {
- obj = NULL;
- for (i = 0; i < n_caches && !obj; i++) {
- if (dev->cache[i].object && dev->cache[i].dirty)
- obj = dev->cache[i].object;
-
- }
- if (obj)
- yaffs_flush_file_cache(obj);
-
- } while (obj);
-
-}
-
-/* Grab us a cache chunk for use.
- * First look for an empty one.
- * Then look for the least recently used non-dirty one.
- * Then look for the least recently used dirty one...., flush and look again.
- */
-static struct yaffs_cache *yaffs_grab_chunk_worker(struct yaffs_dev *dev)
-{
- int i;
-
- if (dev->param.n_caches > 0) {
- for (i = 0; i < dev->param.n_caches; i++) {
- if (!dev->cache[i].object)
- return &dev->cache[i];
- }
- }
-
- return NULL;
-}
-
-static struct yaffs_cache *yaffs_grab_chunk_cache(struct yaffs_dev *dev)
-{
- struct yaffs_cache *cache;
- struct yaffs_obj *the_obj;
- int usage;
- int i;
- int pushout;
-
- if (dev->param.n_caches > 0) {
- /* Try find a non-dirty one... */
-
- cache = yaffs_grab_chunk_worker(dev);
-
- if (!cache) {
- /* They were all dirty, find the last recently used object and flush
- * its cache, then find again.
- * NB what's here is not very accurate, we actually flush the object
- * the last recently used page.
- */
-
- /* With locking we can't assume we can use entry zero */
-
- the_obj = NULL;
- usage = -1;
- cache = NULL;
- pushout = -1;
-
- for (i = 0; i < dev->param.n_caches; i++) {
- if (dev->cache[i].object &&
- !dev->cache[i].locked &&
- (dev->cache[i].last_use < usage
- || !cache)) {
- usage = dev->cache[i].last_use;
- the_obj = dev->cache[i].object;
- cache = &dev->cache[i];
- pushout = i;
- }
- }
-
- if (!cache || cache->dirty) {
- /* Flush and try again */
- yaffs_flush_file_cache(the_obj);
- cache = yaffs_grab_chunk_worker(dev);
- }
-
- }
- return cache;
- } else {
- return NULL;
- }
-}
-
-/* Find a cached chunk */
-static struct yaffs_cache *yaffs_find_chunk_cache(const struct yaffs_obj *obj,
- int chunk_id)
-{
- struct yaffs_dev *dev = obj->my_dev;
- int i;
- if (dev->param.n_caches > 0) {
- for (i = 0; i < dev->param.n_caches; i++) {
- if (dev->cache[i].object == obj &&
- dev->cache[i].chunk_id == chunk_id) {
- dev->cache_hits++;
-
- return &dev->cache[i];
- }
- }
- }
- return NULL;
-}
-
-/* Mark the chunk for the least recently used algorithym */
-static void yaffs_use_cache(struct yaffs_dev *dev, struct yaffs_cache *cache,
- int is_write)
-{
-
- if (dev->param.n_caches > 0) {
- if (dev->cache_last_use < 0 || dev->cache_last_use > 100000000) {
- /* Reset the cache usages */
- int i;
- for (i = 1; i < dev->param.n_caches; i++)
- dev->cache[i].last_use = 0;
-
- dev->cache_last_use = 0;
- }
-
- dev->cache_last_use++;
-
- cache->last_use = dev->cache_last_use;
-
- if (is_write)
- cache->dirty = 1;
- }
-}
-
-/* Invalidate a single cache page.
- * Do this when a whole page gets written,
- * ie the short cache for this page is no longer valid.
- */
-static void yaffs_invalidate_chunk_cache(struct yaffs_obj *object, int chunk_id)
-{
- if (object->my_dev->param.n_caches > 0) {
- struct yaffs_cache *cache =
- yaffs_find_chunk_cache(object, chunk_id);
-
- if (cache)
- cache->object = NULL;
- }
-}
-
-/* Invalidate all the cache pages associated with this object
- * Do this whenever ther file is deleted or resized.
- */
-static void yaffs_invalidate_whole_cache(struct yaffs_obj *in)
-{
- int i;
- struct yaffs_dev *dev = in->my_dev;
-
- if (dev->param.n_caches > 0) {
- /* Invalidate it. */
- for (i = 0; i < dev->param.n_caches; i++) {
- if (dev->cache[i].object == in)
- dev->cache[i].object = NULL;
- }
- }
-}
-
-static void yaffs_unhash_obj(struct yaffs_obj *obj)
-{
- int bucket;
- struct yaffs_dev *dev = obj->my_dev;
-
- /* If it is still linked into the bucket list, free from the list */
- if (!list_empty(&obj->hash_link)) {
- list_del_init(&obj->hash_link);
- bucket = yaffs_hash_fn(obj->obj_id);
- dev->obj_bucket[bucket].count--;
- }
-}
-
-/* FreeObject frees up a Object and puts it back on the free list */
-static void yaffs_free_obj(struct yaffs_obj *obj)
-{
- struct yaffs_dev *dev = obj->my_dev;
-
- yaffs_trace(YAFFS_TRACE_OS, "FreeObject %p inode %p",
- obj, obj->my_inode);
-
- if (!obj)
- YBUG();
- if (obj->parent)
- YBUG();
- if (!list_empty(&obj->siblings))
- YBUG();
-
- if (obj->my_inode) {
- /* We're still hooked up to a cached inode.
- * Don't delete now, but mark for later deletion
- */
- obj->defered_free = 1;
- return;
- }
-
- yaffs_unhash_obj(obj);
-
- yaffs_free_raw_obj(dev, obj);
- dev->n_obj--;
- dev->checkpoint_blocks_required = 0; /* force recalculation */
-}
-
-void yaffs_handle_defered_free(struct yaffs_obj *obj)
-{
- if (obj->defered_free)
- yaffs_free_obj(obj);
-}
-
-static int yaffs_generic_obj_del(struct yaffs_obj *in)
-{
-
- /* First off, invalidate the file's data in the cache, without flushing. */
- yaffs_invalidate_whole_cache(in);
-
- if (in->my_dev->param.is_yaffs2 && (in->parent != in->my_dev->del_dir)) {
- /* Move to the unlinked directory so we have a record that it was deleted. */
- yaffs_change_obj_name(in, in->my_dev->del_dir, _Y("deleted"), 0,
- 0);
-
- }
-
- yaffs_remove_obj_from_dir(in);
- yaffs_chunk_del(in->my_dev, in->hdr_chunk, 1, __LINE__);
- in->hdr_chunk = 0;
-
- yaffs_free_obj(in);
- return YAFFS_OK;
-
-}
-
-static void yaffs_soft_del_file(struct yaffs_obj *obj)
-{
- if (obj->deleted &&
- obj->variant_type == YAFFS_OBJECT_TYPE_FILE && !obj->soft_del) {
- if (obj->n_data_chunks <= 0) {
- /* Empty file with no duplicate object headers,
- * just delete it immediately */
- yaffs_free_tnode(obj->my_dev,
- obj->variant.file_variant.top);
- obj->variant.file_variant.top = NULL;
- yaffs_trace(YAFFS_TRACE_TRACING,
- "yaffs: Deleting empty file %d",
- obj->obj_id);
- yaffs_generic_obj_del(obj);
- } else {
- yaffs_soft_del_worker(obj,
- obj->variant.file_variant.top,
- obj->variant.
- file_variant.top_level, 0);
- obj->soft_del = 1;
- }
- }
-}
-
-/* Pruning removes any part of the file structure tree that is beyond the
- * bounds of the file (ie that does not point to chunks).
- *
- * A file should only get pruned when its size is reduced.
- *
- * Before pruning, the chunks must be pulled from the tree and the
- * level 0 tnode entries must be zeroed out.
- * Could also use this for file deletion, but that's probably better handled
- * by a special case.
- *
- * This function is recursive. For levels > 0 the function is called again on
- * any sub-tree. For level == 0 we just check if the sub-tree has data.
- * If there is no data in a subtree then it is pruned.
- */
-
-static struct yaffs_tnode *yaffs_prune_worker(struct yaffs_dev *dev,
- struct yaffs_tnode *tn, u32 level,
- int del0)
-{
- int i;
- int has_data;
-
- if (tn) {
- has_data = 0;
-
- if (level > 0) {
- for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
- if (tn->internal[i]) {
- tn->internal[i] =
- yaffs_prune_worker(dev,
- tn->internal[i],
- level - 1,
- (i ==
- 0) ? del0 : 1);
- }
-
- if (tn->internal[i])
- has_data++;
- }
- } else {
- int tnode_size_u32 = dev->tnode_size / sizeof(u32);
- u32 *map = (u32 *) tn;
-
- for (i = 0; !has_data && i < tnode_size_u32; i++) {
- if (map[i])
- has_data++;
- }
- }
-
- if (has_data == 0 && del0) {
- /* Free and return NULL */
-
- yaffs_free_tnode(dev, tn);
- tn = NULL;
- }
-
- }
-
- return tn;
-
-}
-
-static int yaffs_prune_tree(struct yaffs_dev *dev,
- struct yaffs_file_var *file_struct)
-{
- int i;
- int has_data;
- int done = 0;
- struct yaffs_tnode *tn;
-
- if (file_struct->top_level > 0) {
- file_struct->top =
- yaffs_prune_worker(dev, file_struct->top,
- file_struct->top_level, 0);
-
- /* Now we have a tree with all the non-zero branches NULL but the height
- * is the same as it was.
- * Let's see if we can trim internal tnodes to shorten the tree.
- * We can do this if only the 0th element in the tnode is in use
- * (ie all the non-zero are NULL)
- */
-
- while (file_struct->top_level && !done) {
- tn = file_struct->top;
-
- has_data = 0;
- for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
- if (tn->internal[i])
- has_data++;
- }
-
- if (!has_data) {
- file_struct->top = tn->internal[0];
- file_struct->top_level--;
- yaffs_free_tnode(dev, tn);
- } else {
- done = 1;
- }
- }
- }
-
- return YAFFS_OK;
-}
-
-/*-------------------- End of File Structure functions.-------------------*/
-
-/* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
-static struct yaffs_obj *yaffs_alloc_empty_obj(struct yaffs_dev *dev)
-{
- struct yaffs_obj *obj = yaffs_alloc_raw_obj(dev);
-
- if (obj) {
- dev->n_obj++;
-
- /* Now sweeten it up... */
-
- memset(obj, 0, sizeof(struct yaffs_obj));
- obj->being_created = 1;
-
- obj->my_dev = dev;
- obj->hdr_chunk = 0;
- obj->variant_type = YAFFS_OBJECT_TYPE_UNKNOWN;
- INIT_LIST_HEAD(&(obj->hard_links));
- INIT_LIST_HEAD(&(obj->hash_link));
- INIT_LIST_HEAD(&obj->siblings);
-
- /* Now make the directory sane */
- if (dev->root_dir) {
- obj->parent = dev->root_dir;
- list_add(&(obj->siblings),
- &dev->root_dir->variant.dir_variant.children);
- }
-
- /* Add it to the lost and found directory.
- * NB Can't put root or lost-n-found in lost-n-found so
- * check if lost-n-found exists first
- */
- if (dev->lost_n_found)
- yaffs_add_obj_to_dir(dev->lost_n_found, obj);
-
- obj->being_created = 0;
- }
-
- dev->checkpoint_blocks_required = 0; /* force recalculation */
-
- return obj;
-}
-
-static int yaffs_find_nice_bucket(struct yaffs_dev *dev)
-{
- int i;
- int l = 999;
- int lowest = 999999;
-
- /* Search for the shortest list or one that
- * isn't too long.
- */
-
- for (i = 0; i < 10 && lowest > 4; i++) {
- dev->bucket_finder++;
- dev->bucket_finder %= YAFFS_NOBJECT_BUCKETS;
- if (dev->obj_bucket[dev->bucket_finder].count < lowest) {
- lowest = dev->obj_bucket[dev->bucket_finder].count;
- l = dev->bucket_finder;
- }
-
- }
-
- return l;
-}
-
-static int yaffs_new_obj_id(struct yaffs_dev *dev)
-{
- int bucket = yaffs_find_nice_bucket(dev);
-
- /* Now find an object value that has not already been taken
- * by scanning the list.
- */
-
- int found = 0;
- struct list_head *i;
-
- u32 n = (u32) bucket;
-
- /* yaffs_check_obj_hash_sane(); */
-
- while (!found) {
- found = 1;
- n += YAFFS_NOBJECT_BUCKETS;
- if (1 || dev->obj_bucket[bucket].count > 0) {
- list_for_each(i, &dev->obj_bucket[bucket].list) {
- /* If there is already one in the list */
- if (i && list_entry(i, struct yaffs_obj,
- hash_link)->obj_id == n) {
- found = 0;
- }
- }
- }
- }
-
- return n;
-}
-
-static void yaffs_hash_obj(struct yaffs_obj *in)
-{
- int bucket = yaffs_hash_fn(in->obj_id);
- struct yaffs_dev *dev = in->my_dev;
-
- list_add(&in->hash_link, &dev->obj_bucket[bucket].list);
- dev->obj_bucket[bucket].count++;
-}
-
-struct yaffs_obj *yaffs_find_by_number(struct yaffs_dev *dev, u32 number)
-{
- int bucket = yaffs_hash_fn(number);
- struct list_head *i;
- struct yaffs_obj *in;
-
- list_for_each(i, &dev->obj_bucket[bucket].list) {
- /* Look if it is in the list */
- if (i) {
- in = list_entry(i, struct yaffs_obj, hash_link);
- if (in->obj_id == number) {
-
- /* Don't tell the VFS about this one if it is defered free */
- if (in->defered_free)
- return NULL;
-
- return in;
- }
- }
- }
-
- return NULL;
-}
-
-struct yaffs_obj *yaffs_new_obj(struct yaffs_dev *dev, int number,
- enum yaffs_obj_type type)
-{
- struct yaffs_obj *the_obj = NULL;
- struct yaffs_tnode *tn = NULL;
-
- if (number < 0)
- number = yaffs_new_obj_id(dev);
-
- if (type == YAFFS_OBJECT_TYPE_FILE) {
- tn = yaffs_get_tnode(dev);
- if (!tn)
- return NULL;
- }
-
- the_obj = yaffs_alloc_empty_obj(dev);
- if (!the_obj) {
- if (tn)
- yaffs_free_tnode(dev, tn);
- return NULL;
- }
-
- if (the_obj) {
- the_obj->fake = 0;
- the_obj->rename_allowed = 1;
- the_obj->unlink_allowed = 1;
- the_obj->obj_id = number;
- yaffs_hash_obj(the_obj);
- the_obj->variant_type = type;
- yaffs_load_current_time(the_obj, 1, 1);
-
- switch (type) {
- case YAFFS_OBJECT_TYPE_FILE:
- the_obj->variant.file_variant.file_size = 0;
- the_obj->variant.file_variant.scanned_size = 0;
- the_obj->variant.file_variant.shrink_size = ~0; /* max */
- the_obj->variant.file_variant.top_level = 0;
- the_obj->variant.file_variant.top = tn;
- break;
- case YAFFS_OBJECT_TYPE_DIRECTORY:
- INIT_LIST_HEAD(&the_obj->variant.dir_variant.children);
- INIT_LIST_HEAD(&the_obj->variant.dir_variant.dirty);
- break;
- case YAFFS_OBJECT_TYPE_SYMLINK:
- case YAFFS_OBJECT_TYPE_HARDLINK:
- case YAFFS_OBJECT_TYPE_SPECIAL:
- /* No action required */
- break;
- case YAFFS_OBJECT_TYPE_UNKNOWN:
- /* todo this should not happen */
- break;
- }
- }
-
- return the_obj;
-}
-
-static struct yaffs_obj *yaffs_create_fake_dir(struct yaffs_dev *dev,
- int number, u32 mode)
-{
-
- struct yaffs_obj *obj =
- yaffs_new_obj(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
- if (obj) {
- obj->fake = 1; /* it is fake so it might have no NAND presence... */
- obj->rename_allowed = 0; /* ... and we're not allowed to rename it... */
- obj->unlink_allowed = 0; /* ... or unlink it */
- obj->deleted = 0;
- obj->unlinked = 0;
- obj->yst_mode = mode;
- obj->my_dev = dev;
- obj->hdr_chunk = 0; /* Not a valid chunk. */
- }
-
- return obj;
-
-}
-
-
-static void yaffs_init_tnodes_and_objs(struct yaffs_dev *dev)
-{
- int i;
-
- dev->n_obj = 0;
- dev->n_tnodes = 0;
-
- yaffs_init_raw_tnodes_and_objs(dev);
-
- for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
- INIT_LIST_HEAD(&dev->obj_bucket[i].list);
- dev->obj_bucket[i].count = 0;
- }
-}
-
-struct yaffs_obj *yaffs_find_or_create_by_number(struct yaffs_dev *dev,
- int number,
- enum yaffs_obj_type type)
-{
- struct yaffs_obj *the_obj = NULL;
-
- if (number > 0)
- the_obj = yaffs_find_by_number(dev, number);
-
- if (!the_obj)
- the_obj = yaffs_new_obj(dev, number, type);
-
- return the_obj;
-
-}
-
-YCHAR *yaffs_clone_str(const YCHAR * str)
-{
- YCHAR *new_str = NULL;
- int len;
-
- if (!str)
- str = _Y("");
-
- len = strnlen(str, YAFFS_MAX_ALIAS_LENGTH);
- new_str = kmalloc((len + 1) * sizeof(YCHAR), GFP_NOFS);
- if (new_str) {
- strncpy(new_str, str, len);
- new_str[len] = 0;
- }
- return new_str;
-
-}
-/*
- *yaffs_update_parent() handles fixing a directories mtime and ctime when a new
- * link (ie. name) is created or deleted in the directory.
- *
- * ie.
- * create dir/a : update dir's mtime/ctime
- * rm dir/a: update dir's mtime/ctime
- * modify dir/a: don't update dir's mtimme/ctime
- *
- * This can be handled immediately or defered. Defering helps reduce the number
- * of updates when many files in a directory are changed within a brief period.
- *
- * If the directory updating is defered then yaffs_update_dirty_dirs must be
- * called periodically.
- */
-
-static void yaffs_update_parent(struct yaffs_obj *obj)
-{
- struct yaffs_dev *dev;
- if (!obj)
- return;
- dev = obj->my_dev;
- obj->dirty = 1;
- yaffs_load_current_time(obj, 0, 1);
- if (dev->param.defered_dir_update) {
- struct list_head *link = &obj->variant.dir_variant.dirty;
-
- if (list_empty(link)) {
- list_add(link, &dev->dirty_dirs);
- yaffs_trace(YAFFS_TRACE_BACKGROUND,
- "Added object %d to dirty directories",
- obj->obj_id);
- }
-
- } else {
- yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
- }
-}
-
-void yaffs_update_dirty_dirs(struct yaffs_dev *dev)
-{
- struct list_head *link;
- struct yaffs_obj *obj;
- struct yaffs_dir_var *d_s;
- union yaffs_obj_var *o_v;
-
- yaffs_trace(YAFFS_TRACE_BACKGROUND, "Update dirty directories");
-
- while (!list_empty(&dev->dirty_dirs)) {
- link = dev->dirty_dirs.next;
- list_del_init(link);
-
- d_s = list_entry(link, struct yaffs_dir_var, dirty);
- o_v = list_entry(d_s, union yaffs_obj_var, dir_variant);
- obj = list_entry(o_v, struct yaffs_obj, variant);
-
- yaffs_trace(YAFFS_TRACE_BACKGROUND, "Update directory %d",
- obj->obj_id);
-
- if (obj->dirty)
- yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
- }
-}
-
-/*
- * Mknod (create) a new object.
- * equiv_obj only has meaning for a hard link;
- * alias_str only has meaning for a symlink.
- * rdev only has meaning for devices (a subset of special objects)
- */
-
-static struct yaffs_obj *yaffs_create_obj(enum yaffs_obj_type type,
- struct yaffs_obj *parent,
- const YCHAR * name,
- u32 mode,
- u32 uid,
- u32 gid,
- struct yaffs_obj *equiv_obj,
- const YCHAR * alias_str, u32 rdev)
-{
- struct yaffs_obj *in;
- YCHAR *str = NULL;
-
- struct yaffs_dev *dev = parent->my_dev;
-
- /* Check if the entry exists. If it does then fail the call since we don't want a dup. */
- if (yaffs_find_by_name(parent, name))
- return NULL;
-
- if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
- str = yaffs_clone_str(alias_str);
- if (!str)
- return NULL;
- }
-
- in = yaffs_new_obj(dev, -1, type);
-
- if (!in) {
- if (str)
- kfree(str);
- return NULL;
- }
-
- if (in) {
- in->hdr_chunk = 0;
- in->valid = 1;
- in->variant_type = type;
-
- in->yst_mode = mode;
-
- yaffs_attribs_init(in, gid, uid, rdev);
-
- in->n_data_chunks = 0;
-
- yaffs_set_obj_name(in, name);
- in->dirty = 1;
-
- yaffs_add_obj_to_dir(parent, in);
-
- in->my_dev = parent->my_dev;
-
- switch (type) {
- case YAFFS_OBJECT_TYPE_SYMLINK:
- in->variant.symlink_variant.alias = str;
- break;
- case YAFFS_OBJECT_TYPE_HARDLINK:
- in->variant.hardlink_variant.equiv_obj = equiv_obj;
- in->variant.hardlink_variant.equiv_id =
- equiv_obj->obj_id;
- list_add(&in->hard_links, &equiv_obj->hard_links);
- break;
- case YAFFS_OBJECT_TYPE_FILE:
- case YAFFS_OBJECT_TYPE_DIRECTORY:
- case YAFFS_OBJECT_TYPE_SPECIAL:
- case YAFFS_OBJECT_TYPE_UNKNOWN:
- /* do nothing */
- break;
- }
-
- if (yaffs_update_oh(in, name, 0, 0, 0, NULL) < 0) {
- /* Could not create the object header, fail the creation */
- yaffs_del_obj(in);
- in = NULL;
- }
-
- yaffs_update_parent(parent);
- }
-
- return in;
-}
-
-struct yaffs_obj *yaffs_create_file(struct yaffs_obj *parent,
- const YCHAR * name, u32 mode, u32 uid,
- u32 gid)
-{
- return yaffs_create_obj(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
- uid, gid, NULL, NULL, 0);
-}
-
-struct yaffs_obj *yaffs_create_dir(struct yaffs_obj *parent, const YCHAR * name,
- u32 mode, u32 uid, u32 gid)
-{
- return yaffs_create_obj(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
- mode, uid, gid, NULL, NULL, 0);
-}
-
-struct yaffs_obj *yaffs_create_special(struct yaffs_obj *parent,
- const YCHAR * name, u32 mode, u32 uid,
- u32 gid, u32 rdev)
-{
- return yaffs_create_obj(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
- uid, gid, NULL, NULL, rdev);
-}
-
-struct yaffs_obj *yaffs_create_symlink(struct yaffs_obj *parent,
- const YCHAR * name, u32 mode, u32 uid,
- u32 gid, const YCHAR * alias)
-{
- return yaffs_create_obj(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
- uid, gid, NULL, alias, 0);
-}
-
-/* yaffs_link_obj returns the object id of the equivalent object.*/
-struct yaffs_obj *yaffs_link_obj(struct yaffs_obj *parent, const YCHAR * name,
- struct yaffs_obj *equiv_obj)
-{
- /* Get the real object in case we were fed a hard link as an equivalent object */
- equiv_obj = yaffs_get_equivalent_obj(equiv_obj);
-
- if (yaffs_create_obj
- (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
- equiv_obj, NULL, 0)) {
- return equiv_obj;
- } else {
- return NULL;
- }
-
-}
-
-
-
-/*------------------------- Block Management and Page Allocation ----------------*/
-
-static int yaffs_init_blocks(struct yaffs_dev *dev)
-{
- int n_blocks = dev->internal_end_block - dev->internal_start_block + 1;
-
- dev->block_info = NULL;
- dev->chunk_bits = NULL;
-
- dev->alloc_block = -1; /* force it to get a new one */
-
- /* If the first allocation strategy fails, thry the alternate one */
- dev->block_info =
- kmalloc(n_blocks * sizeof(struct yaffs_block_info), GFP_NOFS);
- if (!dev->block_info) {
- dev->block_info =
- vmalloc(n_blocks * sizeof(struct yaffs_block_info));
- dev->block_info_alt = 1;
- } else {
- dev->block_info_alt = 0;
- }
-
- if (dev->block_info) {
- /* Set up dynamic blockinfo stuff. Round up bytes. */
- dev->chunk_bit_stride = (dev->param.chunks_per_block + 7) / 8;
- dev->chunk_bits =
- kmalloc(dev->chunk_bit_stride * n_blocks, GFP_NOFS);
- if (!dev->chunk_bits) {
- dev->chunk_bits =
- vmalloc(dev->chunk_bit_stride * n_blocks);
- dev->chunk_bits_alt = 1;
- } else {
- dev->chunk_bits_alt = 0;
- }
- }
-
- if (dev->block_info && dev->chunk_bits) {
- memset(dev->block_info, 0,
- n_blocks * sizeof(struct yaffs_block_info));
- memset(dev->chunk_bits, 0, dev->chunk_bit_stride * n_blocks);
- return YAFFS_OK;
- }
-
- return YAFFS_FAIL;
-}
-
-static void yaffs_deinit_blocks(struct yaffs_dev *dev)
-{
- if (dev->block_info_alt && dev->block_info)
- vfree(dev->block_info);
- else if (dev->block_info)
- kfree(dev->block_info);
-
- dev->block_info_alt = 0;
-
- dev->block_info = NULL;
-
- if (dev->chunk_bits_alt && dev->chunk_bits)
- vfree(dev->chunk_bits);
- else if (dev->chunk_bits)
- kfree(dev->chunk_bits);
- dev->chunk_bits_alt = 0;
- dev->chunk_bits = NULL;
-}
-
-void yaffs_block_became_dirty(struct yaffs_dev *dev, int block_no)
-{
- struct yaffs_block_info *bi = yaffs_get_block_info(dev, block_no);
-
- int erased_ok = 0;
-
- /* If the block is still healthy erase it and mark as clean.
- * If the block has had a data failure, then retire it.
- */
-
- yaffs_trace(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
- "yaffs_block_became_dirty block %d state %d %s",
- block_no, bi->block_state,
- (bi->needs_retiring) ? "needs retiring" : "");
-
- yaffs2_clear_oldest_dirty_seq(dev, bi);
-
- bi->block_state = YAFFS_BLOCK_STATE_DIRTY;
-
- /* If this is the block being garbage collected then stop gc'ing this block */
- if (block_no == dev->gc_block)
- dev->gc_block = 0;
-
- /* If this block is currently the best candidate for gc then drop as a candidate */
- if (block_no == dev->gc_dirtiest) {
- dev->gc_dirtiest = 0;
- dev->gc_pages_in_use = 0;
- }
-
- if (!bi->needs_retiring) {
- yaffs2_checkpt_invalidate(dev);
- erased_ok = yaffs_erase_block(dev, block_no);
- if (!erased_ok) {
- dev->n_erase_failures++;
- yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
- "**>> Erasure failed %d", block_no);
- }
- }
-
- if (erased_ok &&
- ((yaffs_trace_mask & YAFFS_TRACE_ERASE)
- || !yaffs_skip_verification(dev))) {
- int i;
- for (i = 0; i < dev->param.chunks_per_block; i++) {
- if (!yaffs_check_chunk_erased
- (dev, block_no * dev->param.chunks_per_block + i)) {
- yaffs_trace(YAFFS_TRACE_ERROR,
- ">>Block %d erasure supposedly OK, but chunk %d not erased",
- block_no, i);
- }
- }
- }
-
- if (erased_ok) {
- /* Clean it up... */
- bi->block_state = YAFFS_BLOCK_STATE_EMPTY;
- bi->seq_number = 0;
- dev->n_erased_blocks++;
- bi->pages_in_use = 0;
- bi->soft_del_pages = 0;
- bi->has_shrink_hdr = 0;
- bi->skip_erased_check = 1; /* Clean, so no need to check */
- bi->gc_prioritise = 0;
- yaffs_clear_chunk_bits(dev, block_no);
-
- yaffs_trace(YAFFS_TRACE_ERASE,
- "Erased block %d", block_no);
- } else {
- /* We lost a block of free space */
- dev->n_free_chunks -= dev->param.chunks_per_block;
- yaffs_retire_block(dev, block_no);
- yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
- "**>> Block %d retired", block_no);
- }
-}
-
-
-
-static int yaffs_gc_block(struct yaffs_dev *dev, int block, int whole_block)
-{
- int old_chunk;
- int new_chunk;
- int mark_flash;
- int ret_val = YAFFS_OK;
- int i;
- int is_checkpt_block;
- int matching_chunk;
- int max_copies;
-
- int chunks_before = yaffs_get_erased_chunks(dev);
- int chunks_after;
-
- struct yaffs_ext_tags tags;
-
- struct yaffs_block_info *bi = yaffs_get_block_info(dev, block);
-
- struct yaffs_obj *object;
-
- is_checkpt_block = (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT);
-
- yaffs_trace(YAFFS_TRACE_TRACING,
- "Collecting block %d, in use %d, shrink %d, whole_block %d",
- block, bi->pages_in_use, bi->has_shrink_hdr,
- whole_block);
-
- /*yaffs_verify_free_chunks(dev); */
-
- if (bi->block_state == YAFFS_BLOCK_STATE_FULL)
- bi->block_state = YAFFS_BLOCK_STATE_COLLECTING;
-
- bi->has_shrink_hdr = 0; /* clear the flag so that the block can erase */
-
- dev->gc_disable = 1;
-
- if (is_checkpt_block || !yaffs_still_some_chunks(dev, block)) {
- yaffs_trace(YAFFS_TRACE_TRACING,
- "Collecting block %d that has no chunks in use",
- block);
- yaffs_block_became_dirty(dev, block);
- } else {
-
- u8 *buffer = yaffs_get_temp_buffer(dev, __LINE__);
-
- yaffs_verify_blk(dev, bi, block);
-
- max_copies = (whole_block) ? dev->param.chunks_per_block : 5;
- old_chunk = block * dev->param.chunks_per_block + dev->gc_chunk;
-
- for ( /* init already done */ ;
- ret_val == YAFFS_OK &&
- dev->gc_chunk < dev->param.chunks_per_block &&
- (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) &&
- max_copies > 0; dev->gc_chunk++, old_chunk++) {
- if (yaffs_check_chunk_bit(dev, block, dev->gc_chunk)) {
-
- /* This page is in use and might need to be copied off */
-
- max_copies--;
-
- mark_flash = 1;
-
- yaffs_init_tags(&tags);
-
- yaffs_rd_chunk_tags_nand(dev, old_chunk,
- buffer, &tags);
-
- object = yaffs_find_by_number(dev, tags.obj_id);
-
- yaffs_trace(YAFFS_TRACE_GC_DETAIL,
- "Collecting chunk in block %d, %d %d %d ",
- dev->gc_chunk, tags.obj_id,
- tags.chunk_id, tags.n_bytes);
-
- if (object && !yaffs_skip_verification(dev)) {
- if (tags.chunk_id == 0)
- matching_chunk =
- object->hdr_chunk;
- else if (object->soft_del)
- matching_chunk = old_chunk; /* Defeat the test */
- else
- matching_chunk =
- yaffs_find_chunk_in_file
- (object, tags.chunk_id,
- NULL);
-
- if (old_chunk != matching_chunk)
- yaffs_trace(YAFFS_TRACE_ERROR,
- "gc: page in gc mismatch: %d %d %d %d",
- old_chunk,
- matching_chunk,
- tags.obj_id,
- tags.chunk_id);
-
- }
-
- if (!object) {
- yaffs_trace(YAFFS_TRACE_ERROR,
- "page %d in gc has no object: %d %d %d ",
- old_chunk,
- tags.obj_id, tags.chunk_id,
- tags.n_bytes);
- }
-
- if (object &&
- object->deleted &&
- object->soft_del && tags.chunk_id != 0) {
- /* Data chunk in a soft deleted file, throw it away
- * It's a soft deleted data chunk,
- * No need to copy this, just forget about it and
- * fix up the object.
- */
-
- /* Free chunks already includes softdeleted chunks.
- * How ever this chunk is going to soon be really deleted
- * which will increment free chunks.
- * We have to decrement free chunks so this works out properly.
- */
- dev->n_free_chunks--;
- bi->soft_del_pages--;
-
- object->n_data_chunks--;
-
- if (object->n_data_chunks <= 0) {
- /* remeber to clean up the object */
- dev->gc_cleanup_list[dev->
- n_clean_ups]
- = tags.obj_id;
- dev->n_clean_ups++;
- }
- mark_flash = 0;
- } else if (0) {
- /* Todo object && object->deleted && object->n_data_chunks == 0 */
- /* Deleted object header with no data chunks.
- * Can be discarded and the file deleted.
- */
- object->hdr_chunk = 0;
- yaffs_free_tnode(object->my_dev,
- object->
- variant.file_variant.
- top);
- object->variant.file_variant.top = NULL;
- yaffs_generic_obj_del(object);
-
- } else if (object) {
- /* It's either a data chunk in a live file or
- * an ObjectHeader, so we're interested in it.
- * NB Need to keep the ObjectHeaders of deleted files
- * until the whole file has been deleted off
- */
- tags.serial_number++;
-
- dev->n_gc_copies++;
-
- if (tags.chunk_id == 0) {
- /* It is an object Id,
- * We need to nuke the shrinkheader flags first
- * Also need to clean up shadowing.
- * We no longer want the shrink_header flag since its work is done
- * and if it is left in place it will mess up scanning.
- */
-
- struct yaffs_obj_hdr *oh;
- oh = (struct yaffs_obj_hdr *)
- buffer;
-
- oh->is_shrink = 0;
- tags.extra_is_shrink = 0;
-
- oh->shadows_obj = 0;
- oh->inband_shadowed_obj_id = 0;
- tags.extra_shadows = 0;
-
- /* Update file size */
- if (object->variant_type ==
- YAFFS_OBJECT_TYPE_FILE) {
- oh->file_size =
- object->variant.
- file_variant.
- file_size;
- tags.extra_length =
- oh->file_size;
- }
-
- yaffs_verify_oh(object, oh,
- &tags, 1);
- new_chunk =
- yaffs_write_new_chunk(dev,
- (u8 *)
- oh,
- &tags,
- 1);
- } else {
- new_chunk =
- yaffs_write_new_chunk(dev,
- buffer,
- &tags,
- 1);
- }
-
- if (new_chunk < 0) {
- ret_val = YAFFS_FAIL;
- } else {
-
- /* Ok, now fix up the Tnodes etc. */
-
- if (tags.chunk_id == 0) {
- /* It's a header */
- object->hdr_chunk =
- new_chunk;
- object->serial =
- tags.serial_number;
- } else {
- /* It's a data chunk */
- int ok;
- ok = yaffs_put_chunk_in_file(object, tags.chunk_id, new_chunk, 0);
- }
- }
- }
-
- if (ret_val == YAFFS_OK)
- yaffs_chunk_del(dev, old_chunk,
- mark_flash, __LINE__);
-
- }
- }
-
- yaffs_release_temp_buffer(dev, buffer, __LINE__);
-
- }
-
- yaffs_verify_collected_blk(dev, bi, block);
-
- if (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) {
- /*
- * The gc did not complete. Set block state back to FULL
- * because checkpointing does not restore gc.
- */
- bi->block_state = YAFFS_BLOCK_STATE_FULL;
- } else {
- /* The gc completed. */
- /* Do any required cleanups */
- for (i = 0; i < dev->n_clean_ups; i++) {
- /* Time to delete the file too */
- object =
- yaffs_find_by_number(dev, dev->gc_cleanup_list[i]);
- if (object) {
- yaffs_free_tnode(dev,
- object->variant.
- file_variant.top);
- object->variant.file_variant.top = NULL;
- yaffs_trace(YAFFS_TRACE_GC,
- "yaffs: About to finally delete object %d",
- object->obj_id);
- yaffs_generic_obj_del(object);
- object->my_dev->n_deleted_files--;
- }
-
- }
-
- chunks_after = yaffs_get_erased_chunks(dev);
- if (chunks_before >= chunks_after)
- yaffs_trace(YAFFS_TRACE_GC,
- "gc did not increase free chunks before %d after %d",
- chunks_before, chunks_after);
- dev->gc_block = 0;
- dev->gc_chunk = 0;
- dev->n_clean_ups = 0;
- }
-
- dev->gc_disable = 0;
-
- return ret_val;
-}
-
-/*
- * FindBlockForgarbageCollection is used to select the dirtiest block (or close enough)
- * for garbage collection.
- */
-
-static unsigned yaffs_find_gc_block(struct yaffs_dev *dev,
- int aggressive, int background)
-{
- int i;
- int iterations;
- unsigned selected = 0;
- int prioritised = 0;
- int prioritised_exist = 0;
- struct yaffs_block_info *bi;
- int threshold;
-
- /* First let's see if we need to grab a prioritised block */
- if (dev->has_pending_prioritised_gc && !aggressive) {
- dev->gc_dirtiest = 0;
- bi = dev->block_info;
- for (i = dev->internal_start_block;
- i <= dev->internal_end_block && !selected; i++) {
-
- if (bi->gc_prioritise) {
- prioritised_exist = 1;
- if (bi->block_state == YAFFS_BLOCK_STATE_FULL &&
- yaffs_block_ok_for_gc(dev, bi)) {
- selected = i;
- prioritised = 1;
- }
- }
- bi++;
- }
-
- /*
- * If there is a prioritised block and none was selected then
- * this happened because there is at least one old dirty block gumming
- * up the works. Let's gc the oldest dirty block.
- */
-
- if (prioritised_exist &&
- !selected && dev->oldest_dirty_block > 0)
- selected = dev->oldest_dirty_block;
-
- if (!prioritised_exist) /* None found, so we can clear this */
- dev->has_pending_prioritised_gc = 0;
- }
-
- /* If we're doing aggressive GC then we are happy to take a less-dirty block, and
- * search harder.
- * else (we're doing a leasurely gc), then we only bother to do this if the
- * block has only a few pages in use.
- */
-
- if (!selected) {
- int pages_used;
- int n_blocks =
- dev->internal_end_block - dev->internal_start_block + 1;
- if (aggressive) {
- threshold = dev->param.chunks_per_block;
- iterations = n_blocks;
- } else {
- int max_threshold;
-
- if (background)
- max_threshold = dev->param.chunks_per_block / 2;
- else
- max_threshold = dev->param.chunks_per_block / 8;
-
- if (max_threshold < YAFFS_GC_PASSIVE_THRESHOLD)
- max_threshold = YAFFS_GC_PASSIVE_THRESHOLD;
-
- threshold = background ? (dev->gc_not_done + 2) * 2 : 0;
- if (threshold < YAFFS_GC_PASSIVE_THRESHOLD)
- threshold = YAFFS_GC_PASSIVE_THRESHOLD;
- if (threshold > max_threshold)
- threshold = max_threshold;
-
- iterations = n_blocks / 16 + 1;
- if (iterations > 100)
- iterations = 100;
- }
-
- for (i = 0;
- i < iterations &&
- (dev->gc_dirtiest < 1 ||
- dev->gc_pages_in_use > YAFFS_GC_GOOD_ENOUGH); i++) {
- dev->gc_block_finder++;
- if (dev->gc_block_finder < dev->internal_start_block ||
- dev->gc_block_finder > dev->internal_end_block)
- dev->gc_block_finder =
- dev->internal_start_block;
-
- bi = yaffs_get_block_info(dev, dev->gc_block_finder);
-
- pages_used = bi->pages_in_use - bi->soft_del_pages;
-
- if (bi->block_state == YAFFS_BLOCK_STATE_FULL &&
- pages_used < dev->param.chunks_per_block &&
- (dev->gc_dirtiest < 1
- || pages_used < dev->gc_pages_in_use)
- && yaffs_block_ok_for_gc(dev, bi)) {
- dev->gc_dirtiest = dev->gc_block_finder;
- dev->gc_pages_in_use = pages_used;
- }
- }
-
- if (dev->gc_dirtiest > 0 && dev->gc_pages_in_use <= threshold)
- selected = dev->gc_dirtiest;
- }
-
- /*
- * If nothing has been selected for a while, try selecting the oldest dirty
- * because that's gumming up the works.
- */
-
- if (!selected && dev->param.is_yaffs2 &&
- dev->gc_not_done >= (background ? 10 : 20)) {
- yaffs2_find_oldest_dirty_seq(dev);
- if (dev->oldest_dirty_block > 0) {
- selected = dev->oldest_dirty_block;
- dev->gc_dirtiest = selected;
- dev->oldest_dirty_gc_count++;
- bi = yaffs_get_block_info(dev, selected);
- dev->gc_pages_in_use =
- bi->pages_in_use - bi->soft_del_pages;
- } else {
- dev->gc_not_done = 0;
- }
- }
-
- if (selected) {
- yaffs_trace(YAFFS_TRACE_GC,
- "GC Selected block %d with %d free, prioritised:%d",
- selected,
- dev->param.chunks_per_block - dev->gc_pages_in_use,
- prioritised);
-
- dev->n_gc_blocks++;
- if (background)
- dev->bg_gcs++;
-
- dev->gc_dirtiest = 0;
- dev->gc_pages_in_use = 0;
- dev->gc_not_done = 0;
- if (dev->refresh_skip > 0)
- dev->refresh_skip--;
- } else {
- dev->gc_not_done++;
- yaffs_trace(YAFFS_TRACE_GC,
- "GC none: finder %d skip %d threshold %d dirtiest %d using %d oldest %d%s",
- dev->gc_block_finder, dev->gc_not_done, threshold,
- dev->gc_dirtiest, dev->gc_pages_in_use,
- dev->oldest_dirty_block, background ? " bg" : "");
- }
-
- return selected;
-}
-
-/* New garbage collector
- * If we're very low on erased blocks then we do aggressive garbage collection
- * otherwise we do "leasurely" garbage collection.
- * Aggressive gc looks further (whole array) and will accept less dirty blocks.
- * Passive gc only inspects smaller areas and will only accept more dirty blocks.
- *
- * The idea is to help clear out space in a more spread-out manner.
- * Dunno if it really does anything useful.
- */
-static int yaffs_check_gc(struct yaffs_dev *dev, int background)
-{
- int aggressive = 0;
- int gc_ok = YAFFS_OK;
- int max_tries = 0;
- int min_erased;
- int erased_chunks;
- int checkpt_block_adjust;
-
- if (dev->param.gc_control && (dev->param.gc_control(dev) & 1) == 0)
- return YAFFS_OK;
-
- if (dev->gc_disable) {
- /* Bail out so we don't get recursive gc */
- return YAFFS_OK;
- }
-
- /* This loop should pass the first time.
- * We'll only see looping here if the collection does not increase space.
- */
-
- do {
- max_tries++;
-
- checkpt_block_adjust = yaffs_calc_checkpt_blocks_required(dev);
-
- min_erased =
- dev->param.n_reserved_blocks + checkpt_block_adjust + 1;
- erased_chunks =
- dev->n_erased_blocks * dev->param.chunks_per_block;
-
- /* If we need a block soon then do aggressive gc. */
- if (dev->n_erased_blocks < min_erased)
- aggressive = 1;
- else {
- if (!background
- && erased_chunks > (dev->n_free_chunks / 4))
- break;
-
- if (dev->gc_skip > 20)
- dev->gc_skip = 20;
- if (erased_chunks < dev->n_free_chunks / 2 ||
- dev->gc_skip < 1 || background)
- aggressive = 0;
- else {
- dev->gc_skip--;
- break;
- }
- }
-
- dev->gc_skip = 5;
-
- /* If we don't already have a block being gc'd then see if we should start another */
-
- if (dev->gc_block < 1 && !aggressive) {
- dev->gc_block = yaffs2_find_refresh_block(dev);
- dev->gc_chunk = 0;
- dev->n_clean_ups = 0;
- }
- if (dev->gc_block < 1) {
- dev->gc_block =
- yaffs_find_gc_block(dev, aggressive, background);
- dev->gc_chunk = 0;
- dev->n_clean_ups = 0;
- }
-
- if (dev->gc_block > 0) {
- dev->all_gcs++;
- if (!aggressive)
- dev->passive_gc_count++;
-
- yaffs_trace(YAFFS_TRACE_GC,
- "yaffs: GC n_erased_blocks %d aggressive %d",
- dev->n_erased_blocks, aggressive);
-
- gc_ok = yaffs_gc_block(dev, dev->gc_block, aggressive);
- }
-
- if (dev->n_erased_blocks < (dev->param.n_reserved_blocks)
- && dev->gc_block > 0) {
- yaffs_trace(YAFFS_TRACE_GC,
- "yaffs: GC !!!no reclaim!!! n_erased_blocks %d after try %d block %d",
- dev->n_erased_blocks, max_tries,
- dev->gc_block);
- }
- } while ((dev->n_erased_blocks < dev->param.n_reserved_blocks) &&
- (dev->gc_block > 0) && (max_tries < 2));
-
- return aggressive ? gc_ok : YAFFS_OK;
-}
-
-/*
- * yaffs_bg_gc()
- * Garbage collects. Intended to be called from a background thread.
- * Returns non-zero if at least half the free chunks are erased.
- */
-int yaffs_bg_gc(struct yaffs_dev *dev, unsigned urgency)
-{
- int erased_chunks = dev->n_erased_blocks * dev->param.chunks_per_block;
-
- yaffs_trace(YAFFS_TRACE_BACKGROUND, "Background gc %u", urgency);
-
- yaffs_check_gc(dev, 1);
- return erased_chunks > dev->n_free_chunks / 2;
-}
-
-/*-------------------- Data file manipulation -----------------*/
-
-static int yaffs_rd_data_obj(struct yaffs_obj *in, int inode_chunk, u8 * buffer)
-{
- int nand_chunk = yaffs_find_chunk_in_file(in, inode_chunk, NULL);
-
- if (nand_chunk >= 0)
- return yaffs_rd_chunk_tags_nand(in->my_dev, nand_chunk,
- buffer, NULL);
- else {
- yaffs_trace(YAFFS_TRACE_NANDACCESS,
- "Chunk %d not found zero instead",
- nand_chunk);
- /* get sane (zero) data if you read a hole */
- memset(buffer, 0, in->my_dev->data_bytes_per_chunk);
- return 0;
- }
-
-}
-
-void yaffs_chunk_del(struct yaffs_dev *dev, int chunk_id, int mark_flash,
- int lyn)
-{
- int block;
- int page;
- struct yaffs_ext_tags tags;
- struct yaffs_block_info *bi;
-
- if (chunk_id <= 0)
- return;
-
- dev->n_deletions++;
- block = chunk_id / dev->param.chunks_per_block;
- page = chunk_id % dev->param.chunks_per_block;
-
- if (!yaffs_check_chunk_bit(dev, block, page))
- yaffs_trace(YAFFS_TRACE_VERIFY,
- "Deleting invalid chunk %d", chunk_id);
-
- bi = yaffs_get_block_info(dev, block);
-
- yaffs2_update_oldest_dirty_seq(dev, block, bi);
-
- yaffs_trace(YAFFS_TRACE_DELETION,
- "line %d delete of chunk %d",
- lyn, chunk_id);
-
- if (!dev->param.is_yaffs2 && mark_flash &&
- bi->block_state != YAFFS_BLOCK_STATE_COLLECTING) {
-
- yaffs_init_tags(&tags);
-
- tags.is_deleted = 1;
-
- yaffs_wr_chunk_tags_nand(dev, chunk_id, NULL, &tags);
- yaffs_handle_chunk_update(dev, chunk_id, &tags);
- } else {
- dev->n_unmarked_deletions++;
- }
-
- /* Pull out of the management area.
- * If the whole block became dirty, this will kick off an erasure.
- */
- if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING ||
- bi->block_state == YAFFS_BLOCK_STATE_FULL ||
- bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
- bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) {
- dev->n_free_chunks++;
-
- yaffs_clear_chunk_bit(dev, block, page);
-
- bi->pages_in_use--;
-
- if (bi->pages_in_use == 0 &&
- !bi->has_shrink_hdr &&
- bi->block_state != YAFFS_BLOCK_STATE_ALLOCATING &&
- bi->block_state != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
- yaffs_block_became_dirty(dev, block);
- }
-
- }
-
-}
-
-static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk,
- const u8 * buffer, int n_bytes, int use_reserve)
-{
- /* Find old chunk Need to do this to get serial number
- * Write new one and patch into tree.
- * Invalidate old tags.
- */
-
- int prev_chunk_id;
- struct yaffs_ext_tags prev_tags;
-
- int new_chunk_id;
- struct yaffs_ext_tags new_tags;
-
- struct yaffs_dev *dev = in->my_dev;
-
- yaffs_check_gc(dev, 0);
-
- /* Get the previous chunk at this location in the file if it exists.
- * If it does not exist then put a zero into the tree. This creates
- * the tnode now, rather than later when it is harder to clean up.
- */
- prev_chunk_id = yaffs_find_chunk_in_file(in, inode_chunk, &prev_tags);
- if (prev_chunk_id < 1 &&
- !yaffs_put_chunk_in_file(in, inode_chunk, 0, 0))
- return 0;
-
- /* Set up new tags */
- yaffs_init_tags(&new_tags);
-
- new_tags.chunk_id = inode_chunk;
- new_tags.obj_id = in->obj_id;
- new_tags.serial_number =
- (prev_chunk_id > 0) ? prev_tags.serial_number + 1 : 1;
- new_tags.n_bytes = n_bytes;
-
- if (n_bytes < 1 || n_bytes > dev->param.total_bytes_per_chunk) {
- yaffs_trace(YAFFS_TRACE_ERROR,
- "Writing %d bytes to chunk!!!!!!!!!",
- n_bytes);
- YBUG();
- }
-
- new_chunk_id =
- yaffs_write_new_chunk(dev, buffer, &new_tags, use_reserve);
-
- if (new_chunk_id > 0) {
- yaffs_put_chunk_in_file(in, inode_chunk, new_chunk_id, 0);
-
- if (prev_chunk_id > 0)
- yaffs_chunk_del(dev, prev_chunk_id, 1, __LINE__);
-
- yaffs_verify_file_sane(in);
- }
- return new_chunk_id;
-
-}
-
-
-
-static int yaffs_do_xattrib_mod(struct yaffs_obj *obj, int set,
- const YCHAR * name, const void *value, int size,
- int flags)
-{
- struct yaffs_xattr_mod xmod;
-
- int result;
-
- xmod.set = set;
- xmod.name = name;
- xmod.data = value;
- xmod.size = size;
- xmod.flags = flags;
- xmod.result = -ENOSPC;
-
- result = yaffs_update_oh(obj, NULL, 0, 0, 0, &xmod);
-
- if (result > 0)
- return xmod.result;
- else
- return -ENOSPC;
-}
-
-static int yaffs_apply_xattrib_mod(struct yaffs_obj *obj, char *buffer,
- struct yaffs_xattr_mod *xmod)
-{
- int retval = 0;
- int x_offs = sizeof(struct yaffs_obj_hdr);
- struct yaffs_dev *dev = obj->my_dev;
- int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr);
-
- char *x_buffer = buffer + x_offs;
-
- if (xmod->set)
- retval =
- nval_set(x_buffer, x_size, xmod->name, xmod->data,
- xmod->size, xmod->flags);
- else
- retval = nval_del(x_buffer, x_size, xmod->name);
-
- obj->has_xattr = nval_hasvalues(x_buffer, x_size);
- obj->xattr_known = 1;
-
- xmod->result = retval;
-
- return retval;
-}
-
-static int yaffs_do_xattrib_fetch(struct yaffs_obj *obj, const YCHAR * name,
- void *value, int size)
-{
- char *buffer = NULL;
- int result;
- struct yaffs_ext_tags tags;
- struct yaffs_dev *dev = obj->my_dev;
- int x_offs = sizeof(struct yaffs_obj_hdr);
- int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr);
-
- char *x_buffer;
-
- int retval = 0;
-
- if (obj->hdr_chunk < 1)
- return -ENODATA;
-
- /* If we know that the object has no xattribs then don't do all the
- * reading and parsing.
- */
- if (obj->xattr_known && !obj->has_xattr) {
- if (name)
- return -ENODATA;
- else
- return 0;
- }
-
- buffer = (char *)yaffs_get_temp_buffer(dev, __LINE__);
- if (!buffer)
- return -ENOMEM;
-
- result =
- yaffs_rd_chunk_tags_nand(dev, obj->hdr_chunk, (u8 *) buffer, &tags);
-
- if (result != YAFFS_OK)
- retval = -ENOENT;
- else {
- x_buffer = buffer + x_offs;
-
- if (!obj->xattr_known) {
- obj->has_xattr = nval_hasvalues(x_buffer, x_size);
- obj->xattr_known = 1;
- }
-
- if (name)
- retval = nval_get(x_buffer, x_size, name, value, size);
- else
- retval = nval_list(x_buffer, x_size, value, size);
- }
- yaffs_release_temp_buffer(dev, (u8 *) buffer, __LINE__);
- return retval;
-}
-
-int yaffs_set_xattrib(struct yaffs_obj *obj, const YCHAR * name,
- const void *value, int size, int flags)
-{
- return yaffs_do_xattrib_mod(obj, 1, name, value, size, flags);
-}
-
-int yaffs_remove_xattrib(struct yaffs_obj *obj, const YCHAR * name)
-{
- return yaffs_do_xattrib_mod(obj, 0, name, NULL, 0, 0);
-}
-
-int yaffs_get_xattrib(struct yaffs_obj *obj, const YCHAR * name, void *value,
- int size)
-{
- return yaffs_do_xattrib_fetch(obj, name, value, size);
-}
-
-int yaffs_list_xattrib(struct yaffs_obj *obj, char *buffer, int size)
-{
- return yaffs_do_xattrib_fetch(obj, NULL, buffer, size);
-}
-
-static void yaffs_check_obj_details_loaded(struct yaffs_obj *in)
-{
- u8 *chunk_data;
- struct yaffs_obj_hdr *oh;
- struct yaffs_dev *dev;
- struct yaffs_ext_tags tags;
- int result;
- int alloc_failed = 0;
-
- if (!in)
- return;
-
- dev = in->my_dev;
-
- if (in->lazy_loaded && in->hdr_chunk > 0) {
- in->lazy_loaded = 0;
- chunk_data = yaffs_get_temp_buffer(dev, __LINE__);
-
- result =
- yaffs_rd_chunk_tags_nand(dev, in->hdr_chunk, chunk_data,
- &tags);
- oh = (struct yaffs_obj_hdr *)chunk_data;
-
- in->yst_mode = oh->yst_mode;
- yaffs_load_attribs(in, oh);
- yaffs_set_obj_name_from_oh(in, oh);
-
- if (in->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
- in->variant.symlink_variant.alias =
- yaffs_clone_str(oh->alias);
- if (!in->variant.symlink_variant.alias)
- alloc_failed = 1; /* Not returned to caller */
- }
-
- yaffs_release_temp_buffer(dev, chunk_data, __LINE__);
- }
-}
-
-static void yaffs_load_name_from_oh(struct yaffs_dev *dev, YCHAR * name,
- const YCHAR * oh_name, int buff_size)
-{
-#ifdef CONFIG_YAFFS_AUTO_UNICODE
- if (dev->param.auto_unicode) {
- if (*oh_name) {
- /* It is an ASCII name, do an ASCII to
- * unicode conversion */
- const char *ascii_oh_name = (const char *)oh_name;
- int n = buff_size - 1;
- while (n > 0 && *ascii_oh_name) {
- *name = *ascii_oh_name;
- name++;
- ascii_oh_name++;
- n--;
- }
- } else {
- strncpy(name, oh_name + 1, buff_size - 1);
- }
- } else {
-#else
- {
-#endif
- strncpy(name, oh_name, buff_size - 1);
- }
-}
-
-static void yaffs_load_oh_from_name(struct yaffs_dev *dev, YCHAR * oh_name,
- const YCHAR * name)
-{
-#ifdef CONFIG_YAFFS_AUTO_UNICODE
-
- int is_ascii;
- YCHAR *w;
-
- if (dev->param.auto_unicode) {
-
- is_ascii = 1;
- w = name;
-
- /* Figure out if the name will fit in ascii character set */
- while (is_ascii && *w) {
- if ((*w) & 0xff00)
- is_ascii = 0;
- w++;
- }
-
- if (is_ascii) {
- /* It is an ASCII name, so do a unicode to ascii conversion */
- char *ascii_oh_name = (char *)oh_name;
- int n = YAFFS_MAX_NAME_LENGTH - 1;
- while (n > 0 && *name) {
- *ascii_oh_name = *name;
- name++;
- ascii_oh_name++;
- n--;
- }
- } else {
- /* It is a unicode name, so save starting at the second YCHAR */
- *oh_name = 0;
- strncpy(oh_name + 1, name,
- YAFFS_MAX_NAME_LENGTH - 2);
- }
- } else {
-#else
- {
-#endif
- strncpy(oh_name, name, YAFFS_MAX_NAME_LENGTH - 1);
- }
-
-}
-
-/* UpdateObjectHeader updates the header on NAND for an object.
- * If name is not NULL, then that new name is used.
- */
-int yaffs_update_oh(struct yaffs_obj *in, const YCHAR * name, int force,
- int is_shrink, int shadows, struct yaffs_xattr_mod *xmod)
-{
-
- struct yaffs_block_info *bi;
-
- struct yaffs_dev *dev = in->my_dev;
-
- int prev_chunk_id;
- int ret_val = 0;
- int result = 0;
-
- int new_chunk_id;
- struct yaffs_ext_tags new_tags;
- struct yaffs_ext_tags old_tags;
- const YCHAR *alias = NULL;
-
- u8 *buffer = NULL;
- YCHAR old_name[YAFFS_MAX_NAME_LENGTH + 1];
-
- struct yaffs_obj_hdr *oh = NULL;
-
- strcpy(old_name, _Y("silly old name"));
-
- if (!in->fake || in == dev->root_dir ||
- force || xmod) {
-
- yaffs_check_gc(dev, 0);
- yaffs_check_obj_details_loaded(in);
-
- buffer = yaffs_get_temp_buffer(in->my_dev, __LINE__);
- oh = (struct yaffs_obj_hdr *)buffer;
-
- prev_chunk_id = in->hdr_chunk;
-
- if (prev_chunk_id > 0) {
- result = yaffs_rd_chunk_tags_nand(dev, prev_chunk_id,
- buffer, &old_tags);
-
- yaffs_verify_oh(in, oh, &old_tags, 0);
-
- memcpy(old_name, oh->name, sizeof(oh->name));
- memset(buffer, 0xFF, sizeof(struct yaffs_obj_hdr));
- } else {
- memset(buffer, 0xFF, dev->data_bytes_per_chunk);
- }
-
- oh->type = in->variant_type;
- oh->yst_mode = in->yst_mode;
- oh->shadows_obj = oh->inband_shadowed_obj_id = shadows;
-
- yaffs_load_attribs_oh(oh, in);
-
- if (in->parent)
- oh->parent_obj_id = in->parent->obj_id;
- else
- oh->parent_obj_id = 0;
-
- if (name && *name) {
- memset(oh->name, 0, sizeof(oh->name));
- yaffs_load_oh_from_name(dev, oh->name, name);
- } else if (prev_chunk_id > 0) {
- memcpy(oh->name, old_name, sizeof(oh->name));
- } else {
- memset(oh->name, 0, sizeof(oh->name));
- }
-
- oh->is_shrink = is_shrink;
-
- switch (in->variant_type) {
- case YAFFS_OBJECT_TYPE_UNKNOWN:
- /* Should not happen */
- break;
- case YAFFS_OBJECT_TYPE_FILE:
- oh->file_size =
- (oh->parent_obj_id == YAFFS_OBJECTID_DELETED
- || oh->parent_obj_id ==
- YAFFS_OBJECTID_UNLINKED) ? 0 : in->
- variant.file_variant.file_size;
- break;
- case YAFFS_OBJECT_TYPE_HARDLINK:
- oh->equiv_id = in->variant.hardlink_variant.equiv_id;
- break;
- case YAFFS_OBJECT_TYPE_SPECIAL:
- /* Do nothing */
- break;
- case YAFFS_OBJECT_TYPE_DIRECTORY:
- /* Do nothing */
- break;
- case YAFFS_OBJECT_TYPE_SYMLINK:
- alias = in->variant.symlink_variant.alias;
- if (!alias)
- alias = _Y("no alias");
- strncpy(oh->alias, alias, YAFFS_MAX_ALIAS_LENGTH);
- oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
- break;
- }
-
- /* process any xattrib modifications */
- if (xmod)
- yaffs_apply_xattrib_mod(in, (char *)buffer, xmod);
-
- /* Tags */
- yaffs_init_tags(&new_tags);
- in->serial++;
- new_tags.chunk_id = 0;
- new_tags.obj_id = in->obj_id;
- new_tags.serial_number = in->serial;
-
- /* Add extra info for file header */
-
- new_tags.extra_available = 1;
- new_tags.extra_parent_id = oh->parent_obj_id;
- new_tags.extra_length = oh->file_size;
- new_tags.extra_is_shrink = oh->is_shrink;
- new_tags.extra_equiv_id = oh->equiv_id;
- new_tags.extra_shadows = (oh->shadows_obj > 0) ? 1 : 0;
- new_tags.extra_obj_type = in->variant_type;
-
- yaffs_verify_oh(in, oh, &new_tags, 1);
-
- /* Create new chunk in NAND */
- new_chunk_id =
- yaffs_write_new_chunk(dev, buffer, &new_tags,
- (prev_chunk_id > 0) ? 1 : 0);
-
- if (new_chunk_id >= 0) {
-
- in->hdr_chunk = new_chunk_id;
-
- if (prev_chunk_id > 0) {
- yaffs_chunk_del(dev, prev_chunk_id, 1,
- __LINE__);
- }
-
- if (!yaffs_obj_cache_dirty(in))
- in->dirty = 0;
-
- /* If this was a shrink, then mark the block that the chunk lives on */
- if (is_shrink) {
- bi = yaffs_get_block_info(in->my_dev,
- new_chunk_id /
- in->my_dev->param.
- chunks_per_block);
- bi->has_shrink_hdr = 1;
- }
-
- }
-
- ret_val = new_chunk_id;
-
- }
-
- if (buffer)
- yaffs_release_temp_buffer(dev, buffer, __LINE__);
-
- return ret_val;
-}
-
-/*--------------------- File read/write ------------------------
- * Read and write have very similar structures.
- * In general the read/write has three parts to it
- * An incomplete chunk to start with (if the read/write is not chunk-aligned)
- * Some complete chunks
- * An incomplete chunk to end off with
- *
- * Curve-balls: the first chunk might also be the last chunk.
- */
-
-int yaffs_file_rd(struct yaffs_obj *in, u8 * buffer, loff_t offset, int n_bytes)
-{
-
- int chunk;
- u32 start;
- int n_copy;
- int n = n_bytes;
- int n_done = 0;
- struct yaffs_cache *cache;
-
- struct yaffs_dev *dev;
-
- dev = in->my_dev;
-
- while (n > 0) {
- /* chunk = offset / dev->data_bytes_per_chunk + 1; */
- /* start = offset % dev->data_bytes_per_chunk; */
- yaffs_addr_to_chunk(dev, offset, &chunk, &start);
- chunk++;
-
- /* OK now check for the curveball where the start and end are in
- * the same chunk.
- */
- if ((start + n) < dev->data_bytes_per_chunk)
- n_copy = n;
- else
- n_copy = dev->data_bytes_per_chunk - start;
-
- cache = yaffs_find_chunk_cache(in, chunk);
-
- /* If the chunk is already in the cache or it is less than a whole chunk
- * or we're using inband tags then use the cache (if there is caching)
- * else bypass the cache.
- */
- if (cache || n_copy != dev->data_bytes_per_chunk
- || dev->param.inband_tags) {
- if (dev->param.n_caches > 0) {
-
- /* If we can't find the data in the cache, then load it up. */
-
- if (!cache) {
- cache =
- yaffs_grab_chunk_cache(in->my_dev);
- cache->object = in;
- cache->chunk_id = chunk;
- cache->dirty = 0;
- cache->locked = 0;
- yaffs_rd_data_obj(in, chunk,
- cache->data);
- cache->n_bytes = 0;
- }
-
- yaffs_use_cache(dev, cache, 0);
-
- cache->locked = 1;
-
- memcpy(buffer, &cache->data[start], n_copy);
-
- cache->locked = 0;
- } else {
- /* Read into the local buffer then copy.. */
-
- u8 *local_buffer =
- yaffs_get_temp_buffer(dev, __LINE__);
- yaffs_rd_data_obj(in, chunk, local_buffer);
-
- memcpy(buffer, &local_buffer[start], n_copy);
-
- yaffs_release_temp_buffer(dev, local_buffer,
- __LINE__);
- }
-
- } else {
-
- /* A full chunk. Read directly into the supplied buffer. */
- yaffs_rd_data_obj(in, chunk, buffer);
-
- }
-
- n -= n_copy;
- offset += n_copy;
- buffer += n_copy;
- n_done += n_copy;
-
- }
-
- return n_done;
-}
-
-int yaffs_do_file_wr(struct yaffs_obj *in, const u8 * buffer, loff_t offset,
- int n_bytes, int write_trhrough)
-{
-
- int chunk;
- u32 start;
- int n_copy;
- int n = n_bytes;
- int n_done = 0;
- int n_writeback;
- int start_write = offset;
- int chunk_written = 0;
- u32 n_bytes_read;
- u32 chunk_start;
-
- struct yaffs_dev *dev;
-
- dev = in->my_dev;
-
- while (n > 0 && chunk_written >= 0) {
- yaffs_addr_to_chunk(dev, offset, &chunk, &start);
-
- if (chunk * dev->data_bytes_per_chunk + start != offset ||
- start >= dev->data_bytes_per_chunk) {
- yaffs_trace(YAFFS_TRACE_ERROR,
- "AddrToChunk of offset %d gives chunk %d start %d",
- (int)offset, chunk, start);
- }
- chunk++; /* File pos to chunk in file offset */
-
- /* OK now check for the curveball where the start and end are in
- * the same chunk.
- */
-
- if ((start + n) < dev->data_bytes_per_chunk) {
- n_copy = n;
-
- /* Now folks, to calculate how many bytes to write back....
- * If we're overwriting and not writing to then end of file then
- * we need to write back as much as was there before.
- */
-
- chunk_start = ((chunk - 1) * dev->data_bytes_per_chunk);
-
- if (chunk_start > in->variant.file_variant.file_size)
- n_bytes_read = 0; /* Past end of file */
- else
- n_bytes_read =
- in->variant.file_variant.file_size -
- chunk_start;
-
- if (n_bytes_read > dev->data_bytes_per_chunk)
- n_bytes_read = dev->data_bytes_per_chunk;
-
- n_writeback =
- (n_bytes_read >
- (start + n)) ? n_bytes_read : (start + n);
-
- if (n_writeback < 0
- || n_writeback > dev->data_bytes_per_chunk)
- YBUG();
-
- } else {
- n_copy = dev->data_bytes_per_chunk - start;
- n_writeback = dev->data_bytes_per_chunk;
- }
-
- if (n_copy != dev->data_bytes_per_chunk
- || dev->param.inband_tags) {
- /* An incomplete start or end chunk (or maybe both start and end chunk),
- * or we're using inband tags, so we want to use the cache buffers.
- */
- if (dev->param.n_caches > 0) {
- struct yaffs_cache *cache;
- /* If we can't find the data in the cache, then load the cache */
- cache = yaffs_find_chunk_cache(in, chunk);
-
- if (!cache
- && yaffs_check_alloc_available(dev, 1)) {
- cache = yaffs_grab_chunk_cache(dev);
- cache->object = in;
- cache->chunk_id = chunk;
- cache->dirty = 0;
- cache->locked = 0;
- yaffs_rd_data_obj(in, chunk,
- cache->data);
- } else if (cache &&
- !cache->dirty &&
- !yaffs_check_alloc_available(dev,
- 1)) {
- /* Drop the cache if it was a read cache item and
- * no space check has been made for it.
- */
- cache = NULL;
- }
-
- if (cache) {
- yaffs_use_cache(dev, cache, 1);
- cache->locked = 1;
-
- memcpy(&cache->data[start], buffer,
- n_copy);
-
- cache->locked = 0;
- cache->n_bytes = n_writeback;
-
- if (write_trhrough) {
- chunk_written =
- yaffs_wr_data_obj
- (cache->object,
- cache->chunk_id,
- cache->data,
- cache->n_bytes, 1);
- cache->dirty = 0;
- }
-
- } else {
- chunk_written = -1; /* fail the write */
- }
- } else {
- /* An incomplete start or end chunk (or maybe both start and end chunk)
- * Read into the local buffer then copy, then copy over and write back.
- */
-
- u8 *local_buffer =
- yaffs_get_temp_buffer(dev, __LINE__);
-
- yaffs_rd_data_obj(in, chunk, local_buffer);
-
- memcpy(&local_buffer[start], buffer, n_copy);
-
- chunk_written =
- yaffs_wr_data_obj(in, chunk,
- local_buffer,
- n_writeback, 0);
-
- yaffs_release_temp_buffer(dev, local_buffer,
- __LINE__);
-
- }
-
- } else {
- /* A full chunk. Write directly from the supplied buffer. */
-
- chunk_written =
- yaffs_wr_data_obj(in, chunk, buffer,
- dev->data_bytes_per_chunk, 0);
-
- /* Since we've overwritten the cached data, we better invalidate it. */
- yaffs_invalidate_chunk_cache(in, chunk);
- }
-
- if (chunk_written >= 0) {
- n -= n_copy;
- offset += n_copy;
- buffer += n_copy;
- n_done += n_copy;
- }
-
- }
-
- /* Update file object */
-
- if ((start_write + n_done) > in->variant.file_variant.file_size)
- in->variant.file_variant.file_size = (start_write + n_done);
-
- in->dirty = 1;
-
- return n_done;
-}
-
-int yaffs_wr_file(struct yaffs_obj *in, const u8 * buffer, loff_t offset,
- int n_bytes, int write_trhrough)
-{
- yaffs2_handle_hole(in, offset);
- return yaffs_do_file_wr(in, buffer, offset, n_bytes, write_trhrough);
-}
-
-/* ---------------------- File resizing stuff ------------------ */
-
-static void yaffs_prune_chunks(struct yaffs_obj *in, int new_size)
-{
-
- struct yaffs_dev *dev = in->my_dev;
- int old_size = in->variant.file_variant.file_size;
-
- int last_del = 1 + (old_size - 1) / dev->data_bytes_per_chunk;
-
- int start_del = 1 + (new_size + dev->data_bytes_per_chunk - 1) /
- dev->data_bytes_per_chunk;
- int i;
- int chunk_id;
-
- /* Delete backwards so that we don't end up with holes if
- * power is lost part-way through the operation.
- */
- for (i = last_del; i >= start_del; i--) {
- /* NB this could be optimised somewhat,
- * eg. could retrieve the tags and write them without
- * using yaffs_chunk_del
- */
-
- chunk_id = yaffs_find_del_file_chunk(in, i, NULL);
- if (chunk_id > 0) {
- if (chunk_id <
- (dev->internal_start_block *
- dev->param.chunks_per_block)
- || chunk_id >=
- ((dev->internal_end_block +
- 1) * dev->param.chunks_per_block)) {
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "Found daft chunk_id %d for %d",
- chunk_id, i);
- } else {
- in->n_data_chunks--;
- yaffs_chunk_del(dev, chunk_id, 1, __LINE__);
- }
- }
- }
-
-}
-
-void yaffs_resize_file_down(struct yaffs_obj *obj, loff_t new_size)
-{
- int new_full;
- u32 new_partial;
- struct yaffs_dev *dev = obj->my_dev;
-
- yaffs_addr_to_chunk(dev, new_size, &new_full, &new_partial);
-
- yaffs_prune_chunks(obj, new_size);
-
- if (new_partial != 0) {
- int last_chunk = 1 + new_full;
- u8 *local_buffer = yaffs_get_temp_buffer(dev, __LINE__);
-
- /* Rewrite the last chunk with its new size and zero pad */
- yaffs_rd_data_obj(obj, last_chunk, local_buffer);
- memset(local_buffer + new_partial, 0,
- dev->data_bytes_per_chunk - new_partial);
-
- yaffs_wr_data_obj(obj, last_chunk, local_buffer,
- new_partial, 1);
-
- yaffs_release_temp_buffer(dev, local_buffer, __LINE__);
- }
-
- obj->variant.file_variant.file_size = new_size;
-
- yaffs_prune_tree(dev, &obj->variant.file_variant);
-}
-
-int yaffs_resize_file(struct yaffs_obj *in, loff_t new_size)
-{
- struct yaffs_dev *dev = in->my_dev;
- int old_size = in->variant.file_variant.file_size;
-
- yaffs_flush_file_cache(in);
- yaffs_invalidate_whole_cache(in);
-
- yaffs_check_gc(dev, 0);
-
- if (in->variant_type != YAFFS_OBJECT_TYPE_FILE)
- return YAFFS_FAIL;
-
- if (new_size == old_size)
- return YAFFS_OK;
-
- if (new_size > old_size) {
- yaffs2_handle_hole(in, new_size);
- in->variant.file_variant.file_size = new_size;
- } else {
- /* new_size < old_size */
- yaffs_resize_file_down(in, new_size);
- }
-
- /* Write a new object header to reflect the resize.
- * show we've shrunk the file, if need be
- * Do this only if the file is not in the deleted directories
- * and is not shadowed.
- */
- if (in->parent &&
- !in->is_shadowed &&
- in->parent->obj_id != YAFFS_OBJECTID_UNLINKED &&
- in->parent->obj_id != YAFFS_OBJECTID_DELETED)
- yaffs_update_oh(in, NULL, 0, 0, 0, NULL);
-
- return YAFFS_OK;
-}
-
-int yaffs_flush_file(struct yaffs_obj *in, int update_time, int data_sync)
-{
- int ret_val;
- if (in->dirty) {
- yaffs_flush_file_cache(in);
- if (data_sync) /* Only sync data */
- ret_val = YAFFS_OK;
- else {
- if (update_time)
- yaffs_load_current_time(in, 0, 0);
-
- ret_val = (yaffs_update_oh(in, NULL, 0, 0, 0, NULL) >=
- 0) ? YAFFS_OK : YAFFS_FAIL;
- }
- } else {
- ret_val = YAFFS_OK;
- }
-
- return ret_val;
-
-}
-
-
-/* yaffs_del_file deletes the whole file data
- * and the inode associated with the file.
- * It does not delete the links associated with the file.
- */
-static int yaffs_unlink_file_if_needed(struct yaffs_obj *in)
-{
-
- int ret_val;
- int del_now = 0;
- struct yaffs_dev *dev = in->my_dev;
-
- if (!in->my_inode)
- del_now = 1;
-
- if (del_now) {
- ret_val =
- yaffs_change_obj_name(in, in->my_dev->del_dir,
- _Y("deleted"), 0, 0);
- yaffs_trace(YAFFS_TRACE_TRACING,
- "yaffs: immediate deletion of file %d",
- in->obj_id);
- in->deleted = 1;
- in->my_dev->n_deleted_files++;
- if (dev->param.disable_soft_del || dev->param.is_yaffs2)
- yaffs_resize_file(in, 0);
- yaffs_soft_del_file(in);
- } else {
- ret_val =
- yaffs_change_obj_name(in, in->my_dev->unlinked_dir,
- _Y("unlinked"), 0, 0);
- }
-
- return ret_val;
-}
-
-int yaffs_del_file(struct yaffs_obj *in)
-{
- int ret_val = YAFFS_OK;
- int deleted; /* Need to cache value on stack if in is freed */
- struct yaffs_dev *dev = in->my_dev;
-
- if (dev->param.disable_soft_del || dev->param.is_yaffs2)
- yaffs_resize_file(in, 0);
-
- if (in->n_data_chunks > 0) {
- /* Use soft deletion if there is data in the file.
- * That won't be the case if it has been resized to zero.
- */
- if (!in->unlinked)
- ret_val = yaffs_unlink_file_if_needed(in);
-
- deleted = in->deleted;
-
- if (ret_val == YAFFS_OK && in->unlinked && !in->deleted) {
- in->deleted = 1;
- deleted = 1;
- in->my_dev->n_deleted_files++;
- yaffs_soft_del_file(in);
- }
- return deleted ? YAFFS_OK : YAFFS_FAIL;
- } else {
- /* The file has no data chunks so we toss it immediately */
- yaffs_free_tnode(in->my_dev, in->variant.file_variant.top);
- in->variant.file_variant.top = NULL;
- yaffs_generic_obj_del(in);
-
- return YAFFS_OK;
- }
-}
-
-int yaffs_is_non_empty_dir(struct yaffs_obj *obj)
-{
- return (obj &&
- obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) &&
- !(list_empty(&obj->variant.dir_variant.children));
-}
-
-static int yaffs_del_dir(struct yaffs_obj *obj)
-{
- /* First check that the directory is empty. */
- if (yaffs_is_non_empty_dir(obj))
- return YAFFS_FAIL;
-
- return yaffs_generic_obj_del(obj);
-}
-
-static int yaffs_del_symlink(struct yaffs_obj *in)
-{
- if (in->variant.symlink_variant.alias)
- kfree(in->variant.symlink_variant.alias);
- in->variant.symlink_variant.alias = NULL;
-
- return yaffs_generic_obj_del(in);
-}
-
-static int yaffs_del_link(struct yaffs_obj *in)
-{
- /* remove this hardlink from the list assocaited with the equivalent
- * object
- */
- list_del_init(&in->hard_links);
- return yaffs_generic_obj_del(in);
-}
-
-int yaffs_del_obj(struct yaffs_obj *obj)
-{
- int ret_val = -1;
- switch (obj->variant_type) {
- case YAFFS_OBJECT_TYPE_FILE:
- ret_val = yaffs_del_file(obj);
- break;
- case YAFFS_OBJECT_TYPE_DIRECTORY:
- if (!list_empty(&obj->variant.dir_variant.dirty)) {
- yaffs_trace(YAFFS_TRACE_BACKGROUND,
- "Remove object %d from dirty directories",
- obj->obj_id);
- list_del_init(&obj->variant.dir_variant.dirty);
- }
- return yaffs_del_dir(obj);
- break;
- case YAFFS_OBJECT_TYPE_SYMLINK:
- ret_val = yaffs_del_symlink(obj);
- break;
- case YAFFS_OBJECT_TYPE_HARDLINK:
- ret_val = yaffs_del_link(obj);
- break;
- case YAFFS_OBJECT_TYPE_SPECIAL:
- ret_val = yaffs_generic_obj_del(obj);
- break;
- case YAFFS_OBJECT_TYPE_UNKNOWN:
- ret_val = 0;
- break; /* should not happen. */
- }
-
- return ret_val;
-}
-
-static int yaffs_unlink_worker(struct yaffs_obj *obj)
-{
-
- int del_now = 0;
-
- if (!obj->my_inode)
- del_now = 1;
-
- if (obj)
- yaffs_update_parent(obj->parent);
-
- if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) {
- return yaffs_del_link(obj);
- } else if (!list_empty(&obj->hard_links)) {
- /* Curve ball: We're unlinking an object that has a hardlink.
- *
- * This problem arises because we are not strictly following
- * The Linux link/inode model.
- *
- * We can't really delete the object.
- * Instead, we do the following:
- * - Select a hardlink.
- * - Unhook it from the hard links
- * - Move it from its parent directory (so that the rename can work)
- * - Rename the object to the hardlink's name.
- * - Delete the hardlink
- */
-
- struct yaffs_obj *hl;
- struct yaffs_obj *parent;
- int ret_val;
- YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
-
- hl = list_entry(obj->hard_links.next, struct yaffs_obj,
- hard_links);
-
- yaffs_get_obj_name(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
- parent = hl->parent;
-
- list_del_init(&hl->hard_links);
-
- yaffs_add_obj_to_dir(obj->my_dev->unlinked_dir, hl);
-
- ret_val = yaffs_change_obj_name(obj, parent, name, 0, 0);
-
- if (ret_val == YAFFS_OK)
- ret_val = yaffs_generic_obj_del(hl);
-
- return ret_val;
-
- } else if (del_now) {
- switch (obj->variant_type) {
- case YAFFS_OBJECT_TYPE_FILE:
- return yaffs_del_file(obj);
- break;
- case YAFFS_OBJECT_TYPE_DIRECTORY:
- list_del_init(&obj->variant.dir_variant.dirty);
- return yaffs_del_dir(obj);
- break;
- case YAFFS_OBJECT_TYPE_SYMLINK:
- return yaffs_del_symlink(obj);
- break;
- case YAFFS_OBJECT_TYPE_SPECIAL:
- return yaffs_generic_obj_del(obj);
- break;
- case YAFFS_OBJECT_TYPE_HARDLINK:
- case YAFFS_OBJECT_TYPE_UNKNOWN:
- default:
- return YAFFS_FAIL;
- }
- } else if (yaffs_is_non_empty_dir(obj)) {
- return YAFFS_FAIL;
- } else {
- return yaffs_change_obj_name(obj, obj->my_dev->unlinked_dir,
- _Y("unlinked"), 0, 0);
- }
-}
-
-static int yaffs_unlink_obj(struct yaffs_obj *obj)
-{
-
- if (obj && obj->unlink_allowed)
- return yaffs_unlink_worker(obj);
-
- return YAFFS_FAIL;
-
-}
-
-int yaffs_unlinker(struct yaffs_obj *dir, const YCHAR * name)
-{
- struct yaffs_obj *obj;
-
- obj = yaffs_find_by_name(dir, name);
- return yaffs_unlink_obj(obj);
-}
-
-/* Note:
- * If old_name is NULL then we take old_dir as the object to be renamed.
- */
-int yaffs_rename_obj(struct yaffs_obj *old_dir, const YCHAR * old_name,
- struct yaffs_obj *new_dir, const YCHAR * new_name)
-{
- struct yaffs_obj *obj = NULL;
- struct yaffs_obj *existing_target = NULL;
- int force = 0;
- int result;
- struct yaffs_dev *dev;
-
- if (!old_dir || old_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
- YBUG();
- if (!new_dir || new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
- YBUG();
-
- dev = old_dir->my_dev;
-
-#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
- /* Special case for case insemsitive systems.
- * While look-up is case insensitive, the name isn't.
- * Therefore we might want to change x.txt to X.txt
- */
- if (old_dir == new_dir &&
- old_name && new_name &&
- strcmp(old_name, new_name) == 0)
- force = 1;
-#endif
-
- if (strnlen(new_name, YAFFS_MAX_NAME_LENGTH + 1) >
- YAFFS_MAX_NAME_LENGTH)
- /* ENAMETOOLONG */
- return YAFFS_FAIL;
-
- if(old_name)
- obj = yaffs_find_by_name(old_dir, old_name);
- else{
- obj = old_dir;
- old_dir = obj->parent;
- }
-
-
- if (obj && obj->rename_allowed) {
-
- /* Now do the handling for an existing target, if there is one */
-
- existing_target = yaffs_find_by_name(new_dir, new_name);
- if (yaffs_is_non_empty_dir(existing_target)){
- return YAFFS_FAIL; /* ENOTEMPTY */
- } else if (existing_target && existing_target != obj) {
- /* Nuke the target first, using shadowing,
- * but only if it isn't the same object.
- *
- * Note we must disable gc otherwise it can mess up the shadowing.
- *
- */
- dev->gc_disable = 1;
- yaffs_change_obj_name(obj, new_dir, new_name, force,
- existing_target->obj_id);
- existing_target->is_shadowed = 1;
- yaffs_unlink_obj(existing_target);
- dev->gc_disable = 0;
- }
-
- result = yaffs_change_obj_name(obj, new_dir, new_name, 1, 0);
-
- yaffs_update_parent(old_dir);
- if (new_dir != old_dir)
- yaffs_update_parent(new_dir);
-
- return result;
- }
- return YAFFS_FAIL;
-}
-
-/*----------------------- Initialisation Scanning ---------------------- */
-
-void yaffs_handle_shadowed_obj(struct yaffs_dev *dev, int obj_id,
- int backward_scanning)
-{
- struct yaffs_obj *obj;
-
- if (!backward_scanning) {
- /* Handle YAFFS1 forward scanning case
- * For YAFFS1 we always do the deletion
- */
-
- } else {
- /* Handle YAFFS2 case (backward scanning)
- * If the shadowed object exists then ignore.
- */
- obj = yaffs_find_by_number(dev, obj_id);
- if (obj)
- return;
- }
-
- /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
- * We put it in unlinked dir to be cleaned up after the scanning
- */
- obj =
- yaffs_find_or_create_by_number(dev, obj_id, YAFFS_OBJECT_TYPE_FILE);
- if (!obj)
- return;
- obj->is_shadowed = 1;
- yaffs_add_obj_to_dir(dev->unlinked_dir, obj);
- obj->variant.file_variant.shrink_size = 0;
- obj->valid = 1; /* So that we don't read any other info for this file */
-
-}
-
-void yaffs_link_fixup(struct yaffs_dev *dev, struct yaffs_obj *hard_list)
-{
- struct yaffs_obj *hl;
- struct yaffs_obj *in;
-
- while (hard_list) {
- hl = hard_list;
- hard_list = (struct yaffs_obj *)(hard_list->hard_links.next);
-
- in = yaffs_find_by_number(dev,
- hl->variant.
- hardlink_variant.equiv_id);
-
- if (in) {
- /* Add the hardlink pointers */
- hl->variant.hardlink_variant.equiv_obj = in;
- list_add(&hl->hard_links, &in->hard_links);
- } else {
- /* Todo Need to report/handle this better.
- * Got a problem... hardlink to a non-existant object
- */
- hl->variant.hardlink_variant.equiv_obj = NULL;
- INIT_LIST_HEAD(&hl->hard_links);
-
- }
- }
-}
-
-static void yaffs_strip_deleted_objs(struct yaffs_dev *dev)
-{
- /*
- * Sort out state of unlinked and deleted objects after scanning.
- */
- struct list_head *i;
- struct list_head *n;
- struct yaffs_obj *l;
-
- if (dev->read_only)
- return;
-
- /* Soft delete all the unlinked files */
- list_for_each_safe(i, n,
- &dev->unlinked_dir->variant.dir_variant.children) {
- if (i) {
- l = list_entry(i, struct yaffs_obj, siblings);
- yaffs_del_obj(l);
- }
- }
-
- list_for_each_safe(i, n, &dev->del_dir->variant.dir_variant.children) {
- if (i) {
- l = list_entry(i, struct yaffs_obj, siblings);
- yaffs_del_obj(l);
- }
- }
-
-}
-
-/*
- * This code iterates through all the objects making sure that they are rooted.
- * Any unrooted objects are re-rooted in lost+found.
- * An object needs to be in one of:
- * - Directly under deleted, unlinked
- * - Directly or indirectly under root.
- *
- * Note:
- * This code assumes that we don't ever change the current relationships between
- * directories:
- * root_dir->parent == unlinked_dir->parent == del_dir->parent == NULL
- * lost-n-found->parent == root_dir
- *
- * This fixes the problem where directories might have inadvertently been deleted
- * leaving the object "hanging" without being rooted in the directory tree.
- */
-
-static int yaffs_has_null_parent(struct yaffs_dev *dev, struct yaffs_obj *obj)
-{
- return (obj == dev->del_dir ||
- obj == dev->unlinked_dir || obj == dev->root_dir);
-}
-
-static void yaffs_fix_hanging_objs(struct yaffs_dev *dev)
-{
- struct yaffs_obj *obj;
- struct yaffs_obj *parent;
- int i;
- struct list_head *lh;
- struct list_head *n;
- int depth_limit;
- int hanging;
-
- if (dev->read_only)
- return;
-
- /* Iterate through the objects in each hash entry,
- * looking at each object.
- * Make sure it is rooted.
- */
-
- for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
- list_for_each_safe(lh, n, &dev->obj_bucket[i].list) {
- if (lh) {
- obj =
- list_entry(lh, struct yaffs_obj, hash_link);
- parent = obj->parent;
-
- if (yaffs_has_null_parent(dev, obj)) {
- /* These directories are not hanging */
- hanging = 0;
- } else if (!parent
- || parent->variant_type !=
- YAFFS_OBJECT_TYPE_DIRECTORY) {
- hanging = 1;
- } else if (yaffs_has_null_parent(dev, parent)) {
- hanging = 0;
- } else {
- /*
- * Need to follow the parent chain to see if it is hanging.
- */
- hanging = 0;
- depth_limit = 100;
-
- while (parent != dev->root_dir &&
- parent->parent &&
- parent->parent->variant_type ==
- YAFFS_OBJECT_TYPE_DIRECTORY
- && depth_limit > 0) {
- parent = parent->parent;
- depth_limit--;
- }
- if (parent != dev->root_dir)
- hanging = 1;
- }
- if (hanging) {
- yaffs_trace(YAFFS_TRACE_SCAN,
- "Hanging object %d moved to lost and found",
- obj->obj_id);
- yaffs_add_obj_to_dir(dev->lost_n_found,
- obj);
- }
- }
- }
- }
-}
-
-/*
- * Delete directory contents for cleaning up lost and found.
- */
-static void yaffs_del_dir_contents(struct yaffs_obj *dir)
-{
- struct yaffs_obj *obj;
- struct list_head *lh;
- struct list_head *n;
-
- if (dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
- YBUG();
-
- list_for_each_safe(lh, n, &dir->variant.dir_variant.children) {
- if (lh) {
- obj = list_entry(lh, struct yaffs_obj, siblings);
- if (obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY)
- yaffs_del_dir_contents(obj);
-
- yaffs_trace(YAFFS_TRACE_SCAN,
- "Deleting lost_found object %d",
- obj->obj_id);
-
- /* Need to use UnlinkObject since Delete would not handle
- * hardlinked objects correctly.
- */
- yaffs_unlink_obj(obj);
- }
- }
-
-}
-
-static void yaffs_empty_l_n_f(struct yaffs_dev *dev)
-{
- yaffs_del_dir_contents(dev->lost_n_found);
-}
-
-
-struct yaffs_obj *yaffs_find_by_name(struct yaffs_obj *directory,
- const YCHAR * name)
-{
- int sum;
-
- struct list_head *i;
- YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
-
- struct yaffs_obj *l;
-
- if (!name)
- return NULL;
-
- if (!directory) {
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "tragedy: yaffs_find_by_name: null pointer directory"
- );
- YBUG();
- return NULL;
- }
- if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "tragedy: yaffs_find_by_name: non-directory"
- );
- YBUG();
- }
-
- sum = yaffs_calc_name_sum(name);
-
- list_for_each(i, &directory->variant.dir_variant.children) {
- if (i) {
- l = list_entry(i, struct yaffs_obj, siblings);
-
- if (l->parent != directory)
- YBUG();
-
- yaffs_check_obj_details_loaded(l);
-
- /* Special case for lost-n-found */
- if (l->obj_id == YAFFS_OBJECTID_LOSTNFOUND) {
- if (!strcmp(name, YAFFS_LOSTNFOUND_NAME))
- return l;
- } else if (l->sum == sum
- || l->hdr_chunk <= 0) {
- /* LostnFound chunk called Objxxx
- * Do a real check
- */
- yaffs_get_obj_name(l, buffer,
- YAFFS_MAX_NAME_LENGTH + 1);
- if (strncmp
- (name, buffer, YAFFS_MAX_NAME_LENGTH) == 0)
- return l;
- }
- }
- }
-
- return NULL;
-}
-
-/* GetEquivalentObject dereferences any hard links to get to the
- * actual object.
- */
-
-struct yaffs_obj *yaffs_get_equivalent_obj(struct yaffs_obj *obj)
-{
- if (obj && obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) {
- /* We want the object id of the equivalent object, not this one */
- obj = obj->variant.hardlink_variant.equiv_obj;
- yaffs_check_obj_details_loaded(obj);
- }
- return obj;
-}
-
-/*
- * A note or two on object names.
- * * If the object name is missing, we then make one up in the form objnnn
- *
- * * ASCII names are stored in the object header's name field from byte zero
- * * Unicode names are historically stored starting from byte zero.
- *
- * Then there are automatic Unicode names...
- * The purpose of these is to save names in a way that can be read as
- * ASCII or Unicode names as appropriate, thus allowing a Unicode and ASCII
- * system to share files.
- *
- * These automatic unicode are stored slightly differently...
- * - If the name can fit in the ASCII character space then they are saved as
- * ascii names as per above.
- * - If the name needs Unicode then the name is saved in Unicode
- * starting at oh->name[1].
-
- */
-static void yaffs_fix_null_name(struct yaffs_obj *obj, YCHAR * name,
- int buffer_size)
-{
- /* Create an object name if we could not find one. */
- if (strnlen(name, YAFFS_MAX_NAME_LENGTH) == 0) {
- YCHAR local_name[20];
- YCHAR num_string[20];
- YCHAR *x = &num_string[19];
- unsigned v = obj->obj_id;
- num_string[19] = 0;
- while (v > 0) {
- x--;
- *x = '0' + (v % 10);
- v /= 10;
- }
- /* make up a name */
- strcpy(local_name, YAFFS_LOSTNFOUND_PREFIX);
- strcat(local_name, x);
- strncpy(name, local_name, buffer_size - 1);
- }
-}
-
-int yaffs_get_obj_name(struct yaffs_obj *obj, YCHAR * name, int buffer_size)
-{
- memset(name, 0, buffer_size * sizeof(YCHAR));
-
- yaffs_check_obj_details_loaded(obj);
-
- if (obj->obj_id == YAFFS_OBJECTID_LOSTNFOUND) {
- strncpy(name, YAFFS_LOSTNFOUND_NAME, buffer_size - 1);
- }
-#ifndef CONFIG_YAFFS_NO_SHORT_NAMES
- else if (obj->short_name[0]) {
- strcpy(name, obj->short_name);
- }
-#endif
- else if (obj->hdr_chunk > 0) {
- int result;
- u8 *buffer = yaffs_get_temp_buffer(obj->my_dev, __LINE__);
-
- struct yaffs_obj_hdr *oh = (struct yaffs_obj_hdr *)buffer;
-
- memset(buffer, 0, obj->my_dev->data_bytes_per_chunk);
-
- if (obj->hdr_chunk > 0) {
- result = yaffs_rd_chunk_tags_nand(obj->my_dev,
- obj->hdr_chunk,
- buffer, NULL);
- }
- yaffs_load_name_from_oh(obj->my_dev, name, oh->name,
- buffer_size);
-
- yaffs_release_temp_buffer(obj->my_dev, buffer, __LINE__);
- }
-
- yaffs_fix_null_name(obj, name, buffer_size);
-
- return strnlen(name, YAFFS_MAX_NAME_LENGTH);
-}
-
-int yaffs_get_obj_length(struct yaffs_obj *obj)
-{
- /* Dereference any hard linking */
- obj = yaffs_get_equivalent_obj(obj);
-
- if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
- return obj->variant.file_variant.file_size;
- if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
- if (!obj->variant.symlink_variant.alias)
- return 0;
- return strnlen(obj->variant.symlink_variant.alias,
- YAFFS_MAX_ALIAS_LENGTH);
- } else {
- /* Only a directory should drop through to here */
- return obj->my_dev->data_bytes_per_chunk;
- }
-}
-
-int yaffs_get_obj_link_count(struct yaffs_obj *obj)
-{
- int count = 0;
- struct list_head *i;
-
- if (!obj->unlinked)
- count++; /* the object itself */
-
- list_for_each(i, &obj->hard_links)
- count++; /* add the hard links; */
-
- return count;
-}
-
-int yaffs_get_obj_inode(struct yaffs_obj *obj)
-{
- obj = yaffs_get_equivalent_obj(obj);
-
- return obj->obj_id;
-}
-
-unsigned yaffs_get_obj_type(struct yaffs_obj *obj)
-{
- obj = yaffs_get_equivalent_obj(obj);
-
- switch (obj->variant_type) {
- case YAFFS_OBJECT_TYPE_FILE:
- return DT_REG;
- break;
- case YAFFS_OBJECT_TYPE_DIRECTORY:
- return DT_DIR;
- break;
- case YAFFS_OBJECT_TYPE_SYMLINK:
- return DT_LNK;
- break;
- case YAFFS_OBJECT_TYPE_HARDLINK:
- return DT_REG;
- break;
- case YAFFS_OBJECT_TYPE_SPECIAL:
- if (S_ISFIFO(obj->yst_mode))
- return DT_FIFO;
- if (S_ISCHR(obj->yst_mode))
- return DT_CHR;
- if (S_ISBLK(obj->yst_mode))
- return DT_BLK;
- if (S_ISSOCK(obj->yst_mode))
- return DT_SOCK;
- default:
- return DT_REG;
- break;
- }
-}
-
-YCHAR *yaffs_get_symlink_alias(struct yaffs_obj *obj)
-{
- obj = yaffs_get_equivalent_obj(obj);
- if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK)
- return yaffs_clone_str(obj->variant.symlink_variant.alias);
- else
- return yaffs_clone_str(_Y(""));
-}
-
-/*--------------------------- Initialisation code -------------------------- */
-
-static int yaffs_check_dev_fns(const struct yaffs_dev *dev)
-{
-
- /* Common functions, gotta have */
- if (!dev->param.erase_fn || !dev->param.initialise_flash_fn)
- return 0;
-
-#ifdef CONFIG_YAFFS_YAFFS2
-
- /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
- if (dev->param.write_chunk_tags_fn &&
- dev->param.read_chunk_tags_fn &&
- !dev->param.write_chunk_fn &&
- !dev->param.read_chunk_fn &&
- dev->param.bad_block_fn && dev->param.query_block_fn)
- return 1;
-#endif
-
- /* Can use the "spare" style interface for yaffs1 */
- if (!dev->param.is_yaffs2 &&
- !dev->param.write_chunk_tags_fn &&
- !dev->param.read_chunk_tags_fn &&
- dev->param.write_chunk_fn &&
- dev->param.read_chunk_fn &&
- !dev->param.bad_block_fn && !dev->param.query_block_fn)
- return 1;
-
- return 0; /* bad */
-}
-
-static int yaffs_create_initial_dir(struct yaffs_dev *dev)
-{
- /* Initialise the unlinked, deleted, root and lost and found directories */
-
- dev->lost_n_found = dev->root_dir = NULL;
- dev->unlinked_dir = dev->del_dir = NULL;
-
- dev->unlinked_dir =
- yaffs_create_fake_dir(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
-
- dev->del_dir =
- yaffs_create_fake_dir(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
-
- dev->root_dir =
- yaffs_create_fake_dir(dev, YAFFS_OBJECTID_ROOT,
- YAFFS_ROOT_MODE | S_IFDIR);
- dev->lost_n_found =
- yaffs_create_fake_dir(dev, YAFFS_OBJECTID_LOSTNFOUND,
- YAFFS_LOSTNFOUND_MODE | S_IFDIR);
-
- if (dev->lost_n_found && dev->root_dir && dev->unlinked_dir
- && dev->del_dir) {
- yaffs_add_obj_to_dir(dev->root_dir, dev->lost_n_found);
- return YAFFS_OK;
- }
-
- return YAFFS_FAIL;
-}
-
-int yaffs_guts_initialise(struct yaffs_dev *dev)
-{
- int init_failed = 0;
- unsigned x;
- int bits;
-
- yaffs_trace(YAFFS_TRACE_TRACING, "yaffs: yaffs_guts_initialise()" );
-
- /* Check stuff that must be set */
-
- if (!dev) {
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "yaffs: Need a device"
- );
- return YAFFS_FAIL;
- }
-
- dev->internal_start_block = dev->param.start_block;
- dev->internal_end_block = dev->param.end_block;
- dev->block_offset = 0;
- dev->chunk_offset = 0;
- dev->n_free_chunks = 0;
-
- dev->gc_block = 0;
-
- if (dev->param.start_block == 0) {
- dev->internal_start_block = dev->param.start_block + 1;
- dev->internal_end_block = dev->param.end_block + 1;
- dev->block_offset = 1;
- dev->chunk_offset = dev->param.chunks_per_block;
- }
-
- /* Check geometry parameters. */
-
- if ((!dev->param.inband_tags && dev->param.is_yaffs2 &&
- dev->param.total_bytes_per_chunk < 1024) ||
- (!dev->param.is_yaffs2 &&
- dev->param.total_bytes_per_chunk < 512) ||
- (dev->param.inband_tags && !dev->param.is_yaffs2) ||
- dev->param.chunks_per_block < 2 ||
- dev->param.n_reserved_blocks < 2 ||
- dev->internal_start_block <= 0 ||
- dev->internal_end_block <= 0 ||
- dev->internal_end_block <=
- (dev->internal_start_block + dev->param.n_reserved_blocks + 2)
- ) {
- /* otherwise it is too small */
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "NAND geometry problems: chunk size %d, type is yaffs%s, inband_tags %d ",
- dev->param.total_bytes_per_chunk,
- dev->param.is_yaffs2 ? "2" : "",
- dev->param.inband_tags);
- return YAFFS_FAIL;
- }
-
- if (yaffs_init_nand(dev) != YAFFS_OK) {
- yaffs_trace(YAFFS_TRACE_ALWAYS, "InitialiseNAND failed");
- return YAFFS_FAIL;
- }
-
- /* Sort out space for inband tags, if required */
- if (dev->param.inband_tags)
- dev->data_bytes_per_chunk =
- dev->param.total_bytes_per_chunk -
- sizeof(struct yaffs_packed_tags2_tags_only);
- else
- dev->data_bytes_per_chunk = dev->param.total_bytes_per_chunk;
-
- /* Got the right mix of functions? */
- if (!yaffs_check_dev_fns(dev)) {
- /* Function missing */
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "device function(s) missing or wrong");
-
- return YAFFS_FAIL;
- }
-
- if (dev->is_mounted) {
- yaffs_trace(YAFFS_TRACE_ALWAYS, "device already mounted");
- return YAFFS_FAIL;
- }
-
- /* Finished with most checks. One or two more checks happen later on too. */
-
- dev->is_mounted = 1;
-
- /* OK now calculate a few things for the device */
-
- /*
- * Calculate all the chunk size manipulation numbers:
- */
- x = dev->data_bytes_per_chunk;
- /* We always use dev->chunk_shift and dev->chunk_div */
- dev->chunk_shift = calc_shifts(x);
- x >>= dev->chunk_shift;
- dev->chunk_div = x;
- /* We only use chunk mask if chunk_div is 1 */
- dev->chunk_mask = (1 << dev->chunk_shift) - 1;
-
- /*
- * Calculate chunk_grp_bits.
- * We need to find the next power of 2 > than internal_end_block
- */
-
- x = dev->param.chunks_per_block * (dev->internal_end_block + 1);
-
- bits = calc_shifts_ceiling(x);
-
- /* Set up tnode width if wide tnodes are enabled. */
- if (!dev->param.wide_tnodes_disabled) {
- /* bits must be even so that we end up with 32-bit words */
- if (bits & 1)
- bits++;
- if (bits < 16)
- dev->tnode_width = 16;
- else
- dev->tnode_width = bits;
- } else {
- dev->tnode_width = 16;
- }
-
- dev->tnode_mask = (1 << dev->tnode_width) - 1;
-
- /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
- * so if the bitwidth of the
- * chunk range we're using is greater than 16 we need
- * to figure out chunk shift and chunk_grp_size
- */
-
- if (bits <= dev->tnode_width)
- dev->chunk_grp_bits = 0;
- else
- dev->chunk_grp_bits = bits - dev->tnode_width;
-
- dev->tnode_size = (dev->tnode_width * YAFFS_NTNODES_LEVEL0) / 8;
- if (dev->tnode_size < sizeof(struct yaffs_tnode))
- dev->tnode_size = sizeof(struct yaffs_tnode);
-
- dev->chunk_grp_size = 1 << dev->chunk_grp_bits;
-
- if (dev->param.chunks_per_block < dev->chunk_grp_size) {
- /* We have a problem because the soft delete won't work if
- * the chunk group size > chunks per block.
- * This can be remedied by using larger "virtual blocks".
- */
- yaffs_trace(YAFFS_TRACE_ALWAYS, "chunk group too large");
-
- return YAFFS_FAIL;
- }
-
- /* OK, we've finished verifying the device, lets continue with initialisation */
-
- /* More device initialisation */
- dev->all_gcs = 0;
- dev->passive_gc_count = 0;
- dev->oldest_dirty_gc_count = 0;
- dev->bg_gcs = 0;
- dev->gc_block_finder = 0;
- dev->buffered_block = -1;
- dev->doing_buffered_block_rewrite = 0;
- dev->n_deleted_files = 0;
- dev->n_bg_deletions = 0;
- dev->n_unlinked_files = 0;
- dev->n_ecc_fixed = 0;
- dev->n_ecc_unfixed = 0;
- dev->n_tags_ecc_fixed = 0;
- dev->n_tags_ecc_unfixed = 0;
- dev->n_erase_failures = 0;
- dev->n_erased_blocks = 0;
- dev->gc_disable = 0;
- dev->has_pending_prioritised_gc = 1; /* Assume the worst for now, will get fixed on first GC */
- INIT_LIST_HEAD(&dev->dirty_dirs);
- dev->oldest_dirty_seq = 0;
- dev->oldest_dirty_block = 0;
-
- /* Initialise temporary buffers and caches. */
- if (!yaffs_init_tmp_buffers(dev))
- init_failed = 1;
-
- dev->cache = NULL;
- dev->gc_cleanup_list = NULL;
-
- if (!init_failed && dev->param.n_caches > 0) {
- int i;
- void *buf;
- int cache_bytes =
- dev->param.n_caches * sizeof(struct yaffs_cache);
-
- if (dev->param.n_caches > YAFFS_MAX_SHORT_OP_CACHES)
- dev->param.n_caches = YAFFS_MAX_SHORT_OP_CACHES;
-
- dev->cache = kmalloc(cache_bytes, GFP_NOFS);
-
- buf = (u8 *) dev->cache;
-
- if (dev->cache)
- memset(dev->cache, 0, cache_bytes);
-
- for (i = 0; i < dev->param.n_caches && buf; i++) {
- dev->cache[i].object = NULL;
- dev->cache[i].last_use = 0;
- dev->cache[i].dirty = 0;
- dev->cache[i].data = buf =
- kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);
- }
- if (!buf)
- init_failed = 1;
-
- dev->cache_last_use = 0;
- }
-
- dev->cache_hits = 0;
-
- if (!init_failed) {
- dev->gc_cleanup_list =
- kmalloc(dev->param.chunks_per_block * sizeof(u32),
- GFP_NOFS);
- if (!dev->gc_cleanup_list)
- init_failed = 1;
- }
-
- if (dev->param.is_yaffs2)
- dev->param.use_header_file_size = 1;
-
- if (!init_failed && !yaffs_init_blocks(dev))
- init_failed = 1;
-
- yaffs_init_tnodes_and_objs(dev);
-
- if (!init_failed && !yaffs_create_initial_dir(dev))
- init_failed = 1;
-
- if (!init_failed) {
- /* Now scan the flash. */
- if (dev->param.is_yaffs2) {
- if (yaffs2_checkpt_restore(dev)) {
- yaffs_check_obj_details_loaded(dev->root_dir);
- yaffs_trace(YAFFS_TRACE_CHECKPOINT | YAFFS_TRACE_MOUNT,
- "yaffs: restored from checkpoint"
- );
- } else {
-
- /* Clean up the mess caused by an aborted checkpoint load
- * and scan backwards.
- */
- yaffs_deinit_blocks(dev);
-
- yaffs_deinit_tnodes_and_objs(dev);
-
- dev->n_erased_blocks = 0;
- dev->n_free_chunks = 0;
- dev->alloc_block = -1;
- dev->alloc_page = -1;
- dev->n_deleted_files = 0;
- dev->n_unlinked_files = 0;
- dev->n_bg_deletions = 0;
-
- if (!init_failed && !yaffs_init_blocks(dev))
- init_failed = 1;
-
- yaffs_init_tnodes_and_objs(dev);
-
- if (!init_failed
- && !yaffs_create_initial_dir(dev))
- init_failed = 1;
-
- if (!init_failed && !yaffs2_scan_backwards(dev))
- init_failed = 1;
- }
- } else if (!yaffs1_scan(dev)) {
- init_failed = 1;
- }
-
- yaffs_strip_deleted_objs(dev);
- yaffs_fix_hanging_objs(dev);
- if (dev->param.empty_lost_n_found)
- yaffs_empty_l_n_f(dev);
- }
-
- if (init_failed) {
- /* Clean up the mess */
- yaffs_trace(YAFFS_TRACE_TRACING,
- "yaffs: yaffs_guts_initialise() aborted.");
-
- yaffs_deinitialise(dev);
- return YAFFS_FAIL;
- }
-
- /* Zero out stats */
- dev->n_page_reads = 0;
- dev->n_page_writes = 0;
- dev->n_erasures = 0;
- dev->n_gc_copies = 0;
- dev->n_retired_writes = 0;
-
- dev->n_retired_blocks = 0;
-
- yaffs_verify_free_chunks(dev);
- yaffs_verify_blocks(dev);
-
- /* Clean up any aborted checkpoint data */
- if (!dev->is_checkpointed && dev->blocks_in_checkpt > 0)
- yaffs2_checkpt_invalidate(dev);
-
- yaffs_trace(YAFFS_TRACE_TRACING,
- "yaffs: yaffs_guts_initialise() done.");
- return YAFFS_OK;
-
-}
-
-void yaffs_deinitialise(struct yaffs_dev *dev)
-{
- if (dev->is_mounted) {
- int i;
-
- yaffs_deinit_blocks(dev);
- yaffs_deinit_tnodes_and_objs(dev);
- if (dev->param.n_caches > 0 && dev->cache) {
-
- for (i = 0; i < dev->param.n_caches; i++) {
- if (dev->cache[i].data)
- kfree(dev->cache[i].data);
- dev->cache[i].data = NULL;
- }
-
- kfree(dev->cache);
- dev->cache = NULL;
- }
-
- kfree(dev->gc_cleanup_list);
-
- for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
- kfree(dev->temp_buffer[i].buffer);
-
- dev->is_mounted = 0;
-
- if (dev->param.deinitialise_flash_fn)
- dev->param.deinitialise_flash_fn(dev);
- }
-}
-
-int yaffs_count_free_chunks(struct yaffs_dev *dev)
-{
- int n_free = 0;
- int b;
-
- struct yaffs_block_info *blk;
-
- blk = dev->block_info;
- for (b = dev->internal_start_block; b <= dev->internal_end_block; b++) {
- switch (blk->block_state) {
- case YAFFS_BLOCK_STATE_EMPTY:
- case YAFFS_BLOCK_STATE_ALLOCATING:
- case YAFFS_BLOCK_STATE_COLLECTING:
- case YAFFS_BLOCK_STATE_FULL:
- n_free +=
- (dev->param.chunks_per_block - blk->pages_in_use +
- blk->soft_del_pages);
- break;
- default:
- break;
- }
- blk++;
- }
-
- return n_free;
-}
-
-int yaffs_get_n_free_chunks(struct yaffs_dev *dev)
-{
- /* This is what we report to the outside world */
-
- int n_free;
- int n_dirty_caches;
- int blocks_for_checkpt;
- int i;
-
- n_free = dev->n_free_chunks;
- n_free += dev->n_deleted_files;
-
- /* Now count the number of dirty chunks in the cache and subtract those */
-
- for (n_dirty_caches = 0, i = 0; i < dev->param.n_caches; i++) {
- if (dev->cache[i].dirty)
- n_dirty_caches++;
- }
-
- n_free -= n_dirty_caches;
-
- n_free -=
- ((dev->param.n_reserved_blocks + 1) * dev->param.chunks_per_block);
-
- /* Now we figure out how much to reserve for the checkpoint and report that... */
- blocks_for_checkpt = yaffs_calc_checkpt_blocks_required(dev);
-
- n_free -= (blocks_for_checkpt * dev->param.chunks_per_block);
-
- if (n_free < 0)
- n_free = 0;
-
- return n_free;
-
-}