/fs/yaffs2/yaffs_guts.c
C | 4685 lines | 3499 code | 1146 blank | 40 comment | 785 complexity | 6796f9e580737180b321dac8dd942a36 MD5 | raw file
Possible License(s): GPL-2.0
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- /*
- * 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"
- #define YAFFS_GC_GOOD_ENOUGH 2
- #define YAFFS_GC_PASSIVE_THRESHOLD 4
- #include "yaffs_ecc.h"
- static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk,
- const u8 * buffer, int n_bytes, int use_reserve);
- 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) {
-
- offset = (u32) (addr & dev->chunk_mask);
- } else {
-
- 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;
- }
- 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;
- }
- static u32 calc_shifts(u32 x)
- {
- u32 shifts;
- shifts = 0;
- if (!x)
- return 0;
- while (!(x & 1)) {
- x >>= 1;
- shifts++;
- }
- return shifts;
- }
- 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;
- 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);
- 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) {
-
- yaffs_trace(YAFFS_TRACE_BUFFERS,
- "Releasing unmanaged temp buffer in line %d",
- line_no);
- kfree(buffer);
- dev->unmanaged_buffer_deallocs++;
- }
- }
- 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;
- }
- 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;
- 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) {
-
- bi->needs_retiring = 1;
- yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
- "**>> Block %d needs retiring", flash_block);
- }
-
- yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
- yaffs_skip_rest_of_block(dev);
- }
- static inline int yaffs_hash_fn(int n)
- {
- n = abs(n);
- return n % YAFFS_NOBJECT_BUCKETS;
- }
- 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;
- }
- int yaffs_check_ff(u8 * buffer, int n_bytes)
- {
-
- 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) {
- yaffs_trace(YAFFS_TRACE_ERROR,
- "yaffs tragedy: no more erased blocks" );
- return -1;
- }
-
- 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) {
-
- dev->alloc_block = yaffs_find_alloc_block(dev);
- dev->alloc_page = 0;
- }
- if (!use_reserver && !yaffs_check_alloc_available(dev, 1)) {
-
- return -1;
- }
- if (dev->n_erased_blocks < dev->param.n_reserved_blocks
- && dev->alloc_page == 0)
- yaffs_trace(YAFFS_TRACE_ALLOCATE, "Allocating reserve");
-
- 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 (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;
- }
- 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) {
-
- 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.
- */
-
- 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);
- 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) {
- yaffs_handle_chunk_wr_error(dev, chunk, erased_ok);
- continue;
- }
- bi->skip_erased_check = 1;
-
- 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;
- }
- 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++;
- }
- 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))) {
-
- 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
- }
- 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;
- return tn;
- }
- 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;
- }
- 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 >> ( 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;
- }
- 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;
-
- if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
- return NULL;
- if (chunk_id > YAFFS_MAX_CHUNK_ID)
- return NULL;
-
- 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;
-
- 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;
- }
- 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;
-
- 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;
-
- 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) {
-
- 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;
- }
- }
- }
-
- 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]) {
-
- tn->internal[x] = yaffs_get_tnode(dev);
- if (!tn->internal[x])
- return NULL;
- } else if (l == 1) {
-
- if (passed_tn) {
-
- if (tn->internal[x])
- yaffs_free_tnode(dev,
- tn->
- internal[x]);
- tn->internal[x] = passed_tn;
- } else if (!tn->internal[x]) {
-
- tn->internal[x] = yaffs_get_tnode(dev);
- if (!tn->internal[x])
- return NULL;
- }
- }
- tn = tn->internal[x];
- l--;
- }
- } else {
-
- 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)) {
-
- 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)
- {
-
- 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) {
-
- 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)
- {
-
- 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) {
-
- 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);
-
- 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)
- {
- 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) {
- 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)
-
- return YAFFS_OK;
- existing_cunk = yaffs_get_group_base(dev, tn, inode_chunk);
- if (in_scan != 0) {
- if (existing_cunk > 0) {
- if (in_scan > 0) {
-
- yaffs_rd_chunk_tags_nand(dev,
- nand_chunk,
- NULL, &new_tags);
-
- existing_cunk =
- yaffs_find_chunk_in_file(in, inode_chunk,
- &existing_tags);
- }
- if (existing_cunk <= 0) {
-
- yaffs_trace(YAFFS_TRACE_ERROR,
- "yaffs tragedy: existing chunk < 0 in 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)) {
- yaffs_chunk_del(dev, existing_cunk, 1,
- __LINE__);
- } else {
- 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);
- }
- }
- 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 {
-
- }
- }
- }
- 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) {
- 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) {
-
- YBUG();
- }
- yaffs_verify_dir(directory);
- yaffs_remove_obj_from_dir(obj);
-
- 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;
- 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();
- }
-
- 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 ((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 (yaffs_update_oh(obj, new_name, 0, del_op, shadows, NULL) >=
- 0)
- return YAFFS_OK;
- }
- return YAFFS_FAIL;
- }
- 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;
- 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;
-
- 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) {
-
- 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)
-
- yaffs_trace(YAFFS_TRACE_ERROR,
- "yaffs tragedy: no space during cache write");
- }
- }
- void yaffs_flush_whole_cache(struct yaffs_dev *dev)
- {
- struct yaffs_obj *obj;
- int n_caches = dev->param.n_caches;
- int i;
- 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);
- }
- 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) {
-
- cache = yaffs_grab_chunk_worker(dev);
- if (!cache) {
-
- 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) {
-
- yaffs_flush_file_cache(the_obj);
- cache = yaffs_grab_chunk_worker(dev);
- }
- }
- return cache;
- } else {
- return NULL;
- }
- }
- 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;
- }
- 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) {
-
- 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;
- }
- }
- 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) {
-
- 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 (!list_empty(&obj->hash_link)) {
- list_del_init(&obj->hash_link);
- bucket = yaffs_hash_fn(obj->obj_id);
- dev->obj_bucket[bucket].count--;
- }
- }
- 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) {
- obj->defered_free = 1;
- return;
- }
- yaffs_unhash_obj(obj);
- yaffs_free_raw_obj(dev, obj);
- dev->n_obj--;
- dev->checkpoint_blocks_required = 0;
- }
- 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)
- {
-
- yaffs_invalidate_whole_cache(in);
- if (in->my_dev->param.is_yaffs2 && (in->parent != in->my_dev->del_dir)) {
-
- 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) {
- 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;
- }
- }
- }
- 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) {
-
- 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);
- 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;
- }
- 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++;
-
- 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);
-
- if (dev->root_dir) {
- obj->parent = dev->root_dir;
- list_add(&(obj->siblings),
- &dev->root_dir->variant.dir_variant.children);
- }
- if (dev->lost_n_found)
- yaffs_add_obj_to_dir(dev->lost_n_found, obj);
- obj->being_created = 0;
- }
- dev->checkpoint_blocks_required = 0;
- return obj;
- }
- static int yaffs_find_nice_bucket(struct yaffs_dev *dev)
- {
- int i;
- int l = 999;
- int lowest = 999999;
- 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);
- int found = 0;
- struct list_head *i;
- u32 n = (u32) bucket;
-
- 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 (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) {
-
- if (i) {
- in = list_entry(i, struct yaffs_obj, hash_link);
- if (in->obj_id == number) {
-
- 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;
- 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:
-
- break;
- case YAFFS_OBJECT_TYPE_UNKNOWN:
-
- 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;
- obj->rename_allowed = 0;
- obj->unlink_allowed = 0;
- obj->deleted = 0;
- obj->unlinked = 0;
- obj->yst_mode = mode;
- obj->my_dev = dev;
- obj->hdr_chunk = 0;
- }
- 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;
- }
- 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);
- }
- }
- 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;
-
- 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:
-
- break;
- }
- if (yaffs_update_oh(in, name, 0, 0, 0, NULL) < 0) {
-
- 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);
- }
- struct yaffs_obj *yaffs_link_obj(struct yaffs_obj *parent, const YCHAR * name,
- struct yaffs_obj *equiv_obj)
- {
-
- 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;
- }
- }
- 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;
-
- 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) {
-
- 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;
- 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 (block_no == dev->gc_block)
- dev->gc_block = 0;
-
- 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) {
-
- 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;
- bi->gc_prioritise = 0;
- yaffs_clear_chunk_bits(dev, block_no);
- yaffs_trace(YAFFS_TRACE_ERASE,
- "Erased block %d", block_no);
- } else {
-
- 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);
-
- if (bi->block_state == YAFFS_BLOCK_STATE_FULL)
- bi->block_state = YAFFS_BLOCK_STATE_COLLECTING;
- bi->has_shrink_hdr = 0;
- 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 ( ;
- 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)) {
-
- 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;
- 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) {
- dev->n_free_chunks--;
- bi->soft_del_pages--;
- object->n_data_chunks--;
- if (object->n_data_chunks <= 0) {
-
- dev->gc_cleanup_list[dev->
- n_clean_ups]
- = tags.obj_id;
- dev->n_clean_ups++;
- }
- mark_flash = 0;
- } else if (0) {
-
- 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) {
- tags.serial_number++;
- dev->n_gc_copies++;
- if (tags.chunk_id == 0) {
- 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;
-
- 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 *)
- …
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