From de04df3a2555ac04d19c3ad6528503d5bf4ab0e7 Mon Sep 17 00:00:00 2001 From: Wolfgang Wiedmeyer Date: Fri, 23 Oct 2015 18:57:10 +0200 Subject: getting newer filesystem code working --- fs/yaffs2/yaffs_guts.c | 5164 ------------------------------------------------ 1 file changed, 5164 deletions(-) delete mode 100644 fs/yaffs2/yaffs_guts.c (limited to 'fs/yaffs2/yaffs_guts.c') 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 - * - * 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; - -} -- cgit v1.1