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428e60e079
The iterator of list_for_each() is never NULL. Identified with coccinelle. Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
5008 lines
120 KiB
C
5008 lines
120 KiB
C
/*
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* YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
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*
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* Copyright (C) 2002-2011 Aleph One Ltd.
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* for Toby Churchill Ltd and Brightstar Engineering
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*
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* Created by Charles Manning <charles@aleph1.co.uk>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include "yportenv.h"
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#include "yaffs_trace.h"
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#include "yaffs_guts.h"
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#include "yaffs_getblockinfo.h"
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#include "yaffs_tagscompat.h"
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#include "yaffs_nand.h"
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#include "yaffs_yaffs1.h"
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#include "yaffs_yaffs2.h"
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#include "yaffs_bitmap.h"
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#include "yaffs_verify.h"
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#include "yaffs_nand.h"
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#include "yaffs_packedtags2.h"
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#include "yaffs_nameval.h"
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#include "yaffs_allocator.h"
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#include "yaffs_attribs.h"
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#include "yaffs_summary.h"
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/* Note YAFFS_GC_GOOD_ENOUGH must be <= YAFFS_GC_PASSIVE_THRESHOLD */
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#define YAFFS_GC_GOOD_ENOUGH 2
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#define YAFFS_GC_PASSIVE_THRESHOLD 4
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#include "yaffs_ecc.h"
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/* Forward declarations */
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static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk,
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const u8 *buffer, int n_bytes, int use_reserve);
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/* Function to calculate chunk and offset */
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void yaffs_addr_to_chunk(struct yaffs_dev *dev, loff_t addr,
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int *chunk_out, u32 *offset_out)
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{
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int chunk;
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u32 offset;
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chunk = (u32) (addr >> dev->chunk_shift);
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if (dev->chunk_div == 1) {
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/* easy power of 2 case */
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offset = (u32) (addr & dev->chunk_mask);
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} else {
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/* Non power-of-2 case */
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loff_t chunk_base;
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chunk /= dev->chunk_div;
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chunk_base = ((loff_t) chunk) * dev->data_bytes_per_chunk;
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offset = (u32) (addr - chunk_base);
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}
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*chunk_out = chunk;
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*offset_out = offset;
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}
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/* Function to return the number of shifts for a power of 2 greater than or
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* equal to the given number
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* Note we don't try to cater for all possible numbers and this does not have to
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* be hellishly efficient.
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*/
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static inline u32 calc_shifts_ceiling(u32 x)
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{
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int extra_bits;
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int shifts;
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shifts = extra_bits = 0;
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while (x > 1) {
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if (x & 1)
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extra_bits++;
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x >>= 1;
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shifts++;
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}
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if (extra_bits)
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shifts++;
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return shifts;
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}
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/* Function to return the number of shifts to get a 1 in bit 0
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*/
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static inline u32 calc_shifts(u32 x)
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{
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u32 shifts;
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shifts = 0;
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if (!x)
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return 0;
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while (!(x & 1)) {
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x >>= 1;
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shifts++;
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}
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return shifts;
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}
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/*
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* Temporary buffer manipulations.
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*/
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static int yaffs_init_tmp_buffers(struct yaffs_dev *dev)
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{
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int i;
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u8 *buf = (u8 *) 1;
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memset(dev->temp_buffer, 0, sizeof(dev->temp_buffer));
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for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
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dev->temp_buffer[i].in_use = 0;
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buf = kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);
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dev->temp_buffer[i].buffer = buf;
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}
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return buf ? YAFFS_OK : YAFFS_FAIL;
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}
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u8 *yaffs_get_temp_buffer(struct yaffs_dev * dev)
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{
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int i;
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dev->temp_in_use++;
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if (dev->temp_in_use > dev->max_temp)
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dev->max_temp = dev->temp_in_use;
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for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
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if (dev->temp_buffer[i].in_use == 0) {
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dev->temp_buffer[i].in_use = 1;
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return dev->temp_buffer[i].buffer;
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}
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}
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yaffs_trace(YAFFS_TRACE_BUFFERS, "Out of temp buffers");
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/*
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* If we got here then we have to allocate an unmanaged one
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* This is not good.
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*/
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dev->unmanaged_buffer_allocs++;
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return kmalloc(dev->data_bytes_per_chunk, GFP_NOFS);
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}
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void yaffs_release_temp_buffer(struct yaffs_dev *dev, u8 *buffer)
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{
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int i;
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dev->temp_in_use--;
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for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
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if (dev->temp_buffer[i].buffer == buffer) {
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dev->temp_buffer[i].in_use = 0;
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return;
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}
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}
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if (buffer) {
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/* assume it is an unmanaged one. */
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yaffs_trace(YAFFS_TRACE_BUFFERS,
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"Releasing unmanaged temp buffer");
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kfree(buffer);
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dev->unmanaged_buffer_deallocs++;
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}
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}
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/*
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* Determine if we have a managed buffer.
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*/
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int yaffs_is_managed_tmp_buffer(struct yaffs_dev *dev, const u8 *buffer)
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{
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int i;
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for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
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if (dev->temp_buffer[i].buffer == buffer)
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return 1;
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}
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for (i = 0; i < dev->param.n_caches; i++) {
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if (dev->cache[i].data == buffer)
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return 1;
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}
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if (buffer == dev->checkpt_buffer)
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return 1;
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yaffs_trace(YAFFS_TRACE_ALWAYS,
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"yaffs: unmaged buffer detected.");
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return 0;
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}
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/*
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* Functions for robustisizing TODO
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*
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*/
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static void yaffs_handle_chunk_wr_ok(struct yaffs_dev *dev, int nand_chunk,
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const u8 *data,
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const struct yaffs_ext_tags *tags)
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{
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}
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static void yaffs_handle_chunk_update(struct yaffs_dev *dev, int nand_chunk,
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const struct yaffs_ext_tags *tags)
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{
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}
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void yaffs_handle_chunk_error(struct yaffs_dev *dev,
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struct yaffs_block_info *bi)
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{
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if (!bi->gc_prioritise) {
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bi->gc_prioritise = 1;
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dev->has_pending_prioritised_gc = 1;
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bi->chunk_error_strikes++;
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if (bi->chunk_error_strikes > 3) {
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bi->needs_retiring = 1; /* Too many stikes, so retire */
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yaffs_trace(YAFFS_TRACE_ALWAYS,
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"yaffs: Block struck out");
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}
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}
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}
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static void yaffs_handle_chunk_wr_error(struct yaffs_dev *dev, int nand_chunk,
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int erased_ok)
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{
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int flash_block = nand_chunk / dev->param.chunks_per_block;
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struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block);
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yaffs_handle_chunk_error(dev, bi);
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if (erased_ok) {
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/* Was an actual write failure,
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* so mark the block for retirement.*/
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bi->needs_retiring = 1;
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yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
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"**>> Block %d needs retiring", flash_block);
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}
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/* Delete the chunk */
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yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
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yaffs_skip_rest_of_block(dev);
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}
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/*
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* Verification code
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*/
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/*
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* Simple hash function. Needs to have a reasonable spread
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*/
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static inline int yaffs_hash_fn(int n)
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{
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if (n < 0)
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n = -n;
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return n % YAFFS_NOBJECT_BUCKETS;
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}
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/*
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* Access functions to useful fake objects.
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* Note that root might have a presence in NAND if permissions are set.
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*/
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struct yaffs_obj *yaffs_root(struct yaffs_dev *dev)
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{
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return dev->root_dir;
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}
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struct yaffs_obj *yaffs_lost_n_found(struct yaffs_dev *dev)
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{
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return dev->lost_n_found;
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}
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/*
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* Erased NAND checking functions
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*/
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int yaffs_check_ff(u8 *buffer, int n_bytes)
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{
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/* Horrible, slow implementation */
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while (n_bytes--) {
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if (*buffer != 0xff)
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return 0;
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buffer++;
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}
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return 1;
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}
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static int yaffs_check_chunk_erased(struct yaffs_dev *dev, int nand_chunk)
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{
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int retval = YAFFS_OK;
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u8 *data = yaffs_get_temp_buffer(dev);
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struct yaffs_ext_tags tags;
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yaffs_rd_chunk_tags_nand(dev, nand_chunk, data, &tags);
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if (tags.ecc_result > YAFFS_ECC_RESULT_NO_ERROR)
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retval = YAFFS_FAIL;
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if (!yaffs_check_ff(data, dev->data_bytes_per_chunk) ||
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tags.chunk_used) {
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yaffs_trace(YAFFS_TRACE_NANDACCESS,
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"Chunk %d not erased", nand_chunk);
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retval = YAFFS_FAIL;
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}
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yaffs_release_temp_buffer(dev, data);
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return retval;
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}
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static int yaffs_verify_chunk_written(struct yaffs_dev *dev,
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int nand_chunk,
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const u8 *data,
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struct yaffs_ext_tags *tags)
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{
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int retval = YAFFS_OK;
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struct yaffs_ext_tags temp_tags;
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u8 *buffer = yaffs_get_temp_buffer(dev);
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yaffs_rd_chunk_tags_nand(dev, nand_chunk, buffer, &temp_tags);
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if (memcmp(buffer, data, dev->data_bytes_per_chunk) ||
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temp_tags.obj_id != tags->obj_id ||
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temp_tags.chunk_id != tags->chunk_id ||
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temp_tags.n_bytes != tags->n_bytes)
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retval = YAFFS_FAIL;
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yaffs_release_temp_buffer(dev, buffer);
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return retval;
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}
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int yaffs_check_alloc_available(struct yaffs_dev *dev, int n_chunks)
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{
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int reserved_chunks;
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int reserved_blocks = dev->param.n_reserved_blocks;
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int checkpt_blocks;
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checkpt_blocks = yaffs_calc_checkpt_blocks_required(dev);
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reserved_chunks =
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(reserved_blocks + checkpt_blocks) * dev->param.chunks_per_block;
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return (dev->n_free_chunks > (reserved_chunks + n_chunks));
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}
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static int yaffs_find_alloc_block(struct yaffs_dev *dev)
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{
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int i;
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struct yaffs_block_info *bi;
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if (dev->n_erased_blocks < 1) {
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/* Hoosterman we've got a problem.
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* Can't get space to gc
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*/
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yaffs_trace(YAFFS_TRACE_ERROR,
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"yaffs tragedy: no more erased blocks");
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return -1;
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}
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/* Find an empty block. */
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for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
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dev->alloc_block_finder++;
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if (dev->alloc_block_finder < dev->internal_start_block
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|| dev->alloc_block_finder > dev->internal_end_block) {
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dev->alloc_block_finder = dev->internal_start_block;
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}
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bi = yaffs_get_block_info(dev, dev->alloc_block_finder);
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if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) {
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bi->block_state = YAFFS_BLOCK_STATE_ALLOCATING;
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dev->seq_number++;
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bi->seq_number = dev->seq_number;
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dev->n_erased_blocks--;
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yaffs_trace(YAFFS_TRACE_ALLOCATE,
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"Allocated block %d, seq %d, %d left" ,
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dev->alloc_block_finder, dev->seq_number,
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dev->n_erased_blocks);
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return dev->alloc_block_finder;
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}
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}
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yaffs_trace(YAFFS_TRACE_ALWAYS,
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"yaffs tragedy: no more erased blocks, but there should have been %d",
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dev->n_erased_blocks);
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return -1;
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}
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static int yaffs_alloc_chunk(struct yaffs_dev *dev, int use_reserver,
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struct yaffs_block_info **block_ptr)
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{
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int ret_val;
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struct yaffs_block_info *bi;
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if (dev->alloc_block < 0) {
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/* Get next block to allocate off */
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dev->alloc_block = yaffs_find_alloc_block(dev);
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dev->alloc_page = 0;
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}
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if (!use_reserver && !yaffs_check_alloc_available(dev, 1)) {
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/* No space unless we're allowed to use the reserve. */
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return -1;
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}
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if (dev->n_erased_blocks < dev->param.n_reserved_blocks
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&& dev->alloc_page == 0)
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yaffs_trace(YAFFS_TRACE_ALLOCATE, "Allocating reserve");
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/* Next page please.... */
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if (dev->alloc_block >= 0) {
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bi = yaffs_get_block_info(dev, dev->alloc_block);
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ret_val = (dev->alloc_block * dev->param.chunks_per_block) +
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dev->alloc_page;
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bi->pages_in_use++;
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yaffs_set_chunk_bit(dev, dev->alloc_block, dev->alloc_page);
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dev->alloc_page++;
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dev->n_free_chunks--;
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/* If the block is full set the state to full */
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if (dev->alloc_page >= dev->param.chunks_per_block) {
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bi->block_state = YAFFS_BLOCK_STATE_FULL;
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dev->alloc_block = -1;
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}
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if (block_ptr)
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*block_ptr = bi;
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return ret_val;
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}
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yaffs_trace(YAFFS_TRACE_ERROR,
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"!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!");
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return -1;
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}
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static int yaffs_get_erased_chunks(struct yaffs_dev *dev)
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{
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int n;
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n = dev->n_erased_blocks * dev->param.chunks_per_block;
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if (dev->alloc_block > 0)
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n += (dev->param.chunks_per_block - dev->alloc_page);
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return n;
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}
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/*
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* yaffs_skip_rest_of_block() skips over the rest of the allocation block
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* if we don't want to write to it.
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*/
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void yaffs_skip_rest_of_block(struct yaffs_dev *dev)
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{
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struct yaffs_block_info *bi;
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if (dev->alloc_block > 0) {
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bi = yaffs_get_block_info(dev, dev->alloc_block);
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if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING) {
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bi->block_state = YAFFS_BLOCK_STATE_FULL;
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dev->alloc_block = -1;
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}
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}
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}
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static int yaffs_write_new_chunk(struct yaffs_dev *dev,
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const u8 *data,
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struct yaffs_ext_tags *tags, int use_reserver)
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{
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int attempts = 0;
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int write_ok = 0;
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int chunk;
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yaffs2_checkpt_invalidate(dev);
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do {
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struct yaffs_block_info *bi = 0;
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int erased_ok = 0;
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chunk = yaffs_alloc_chunk(dev, use_reserver, &bi);
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if (chunk < 0) {
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/* no space */
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break;
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}
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/* First check this chunk is erased, if it needs
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* checking. The checking policy (unless forced
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* always on) is as follows:
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*
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* Check the first page we try to write in a block.
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* If the check passes then we don't need to check any
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* more. If the check fails, we check again...
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* If the block has been erased, we don't need to check.
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*
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* However, if the block has been prioritised for gc,
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* then we think there might be something odd about
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* this block and stop using it.
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*
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* Rationale: We should only ever see chunks that have
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* not been erased if there was a partially written
|
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* chunk due to power loss. This checking policy should
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* catch that case with very few checks and thus save a
|
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* 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_retried_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);
|
|
|
|
memset(buffer, 0xff, dev->data_bytes_per_chunk);
|
|
memset(&tags, 0, sizeof(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);
|
|
}
|
|
}
|
|
|
|
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;
|
|
|
|
if (!name)
|
|
return 0;
|
|
|
|
while ((*name) && i < (YAFFS_MAX_NAME_LENGTH / 2)) {
|
|
|
|
/* 0x1f mask is case insensitive */
|
|
sum += ((*name) & 0x1f) * i;
|
|
i++;
|
|
name++;
|
|
}
|
|
return sum;
|
|
}
|
|
|
|
void yaffs_set_obj_name(struct yaffs_obj *obj, const YCHAR * name)
|
|
{
|
|
memset(obj->short_name, 0, sizeof(obj->short_name));
|
|
if (name &&
|
|
yaffs_strnlen(name, YAFFS_SHORT_NAME_LENGTH + 1) <=
|
|
YAFFS_SHORT_NAME_LENGTH)
|
|
yaffs_strcpy(obj->short_name, name);
|
|
else
|
|
obj->short_name[0] = _Y('\0');
|
|
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
|
|
}
|
|
|
|
loff_t yaffs_max_file_size(struct yaffs_dev *dev)
|
|
{
|
|
return ((loff_t) YAFFS_MAX_CHUNK_ID) * dev->data_bytes_per_chunk;
|
|
}
|
|
|
|
/*-------------------- 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 >> 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;
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/* add_find_tnode_0 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, 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)
|
|
return ret_val;
|
|
|
|
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)
|
|
return ret_val;
|
|
|
|
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"
|
|
);
|
|
BUG();
|
|
}
|
|
|
|
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
|
|
* 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.
|
|
* 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
|
|
* 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)
|
|
return 1;
|
|
|
|
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 {
|
|
/* Can this happen? */
|
|
}
|
|
}
|
|
}
|
|
return (all_done) ? 1 : 0;
|
|
}
|
|
|
|
/* level 0 */
|
|
for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
|
|
the_chunk = yaffs_get_group_base(dev, tn, i);
|
|
if (the_chunk) {
|
|
yaffs_soft_del_chunk(dev, the_chunk);
|
|
yaffs_load_tnode_0(dev, tn, i, 0);
|
|
}
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
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"
|
|
);
|
|
BUG();
|
|
return;
|
|
}
|
|
if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
|
|
yaffs_trace(YAFFS_TRACE_ALWAYS,
|
|
"tragedy: Trying to add an object to a non-directory"
|
|
);
|
|
BUG();
|
|
}
|
|
|
|
if (obj->siblings.prev == NULL) {
|
|
/* Not initialised */
|
|
BUG();
|
|
}
|
|
|
|
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"
|
|
);
|
|
BUG();
|
|
}
|
|
|
|
unlink_op = (new_dir == obj->my_dev->unlinked_dir);
|
|
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 OK.
|
|
* else only proceed if the new name does not exist and 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)
|
|
return YAFFS_FAIL;
|
|
|
|
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 */
|
|
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 small 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 < 1)
|
|
return;
|
|
do {
|
|
cache = NULL;
|
|
|
|
/* Find the lowest dirty chunk for this object */
|
|
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;
|
|
|
|
if (dev->param.n_caches < 1)
|
|
return NULL;
|
|
|
|
/* Try find a non-dirty one... */
|
|
|
|
cache = yaffs_grab_chunk_worker(dev);
|
|
|
|
if (!cache) {
|
|
/* They were all dirty, find the LRU object and flush
|
|
* its cache, then find again.
|
|
* NB what's here is not very accurate,
|
|
* we actually flush the object with the LRU chunk.
|
|
*/
|
|
|
|
/* With locking we can't assume we can use entry zero,
|
|
* Set the_obj to a valid pointer for Coverity. */
|
|
the_obj = dev->cache[0].object;
|
|
usage = -1;
|
|
cache = NULL;
|
|
|
|
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];
|
|
}
|
|
}
|
|
|
|
if (!cache || cache->dirty) {
|
|
/* Flush and try again */
|
|
yaffs_flush_file_cache(the_obj);
|
|
cache = yaffs_grab_chunk_worker(dev);
|
|
}
|
|
}
|
|
return cache;
|
|
}
|
|
|
|
/* 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 < 1)
|
|
return NULL;
|
|
|
|
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)
|
|
{
|
|
int i;
|
|
|
|
if (dev->param.n_caches < 1)
|
|
return;
|
|
|
|
if (dev->cache_last_use < 0 ||
|
|
dev->cache_last_use > 100000000) {
|
|
/* Reset the cache usages */
|
|
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)
|
|
{
|
|
struct yaffs_cache *cache;
|
|
|
|
if (object->my_dev->param.n_caches > 0) {
|
|
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;
|
|
|
|
if (!obj) {
|
|
BUG();
|
|
return;
|
|
}
|
|
dev = obj->my_dev;
|
|
yaffs_trace(YAFFS_TRACE_OS, "FreeObject %p inode %p",
|
|
obj, obj->my_inode);
|
|
if (obj->parent)
|
|
BUG();
|
|
if (!list_empty(&obj->siblings))
|
|
BUG();
|
|
|
|
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)
|
|
{
|
|
/* Iinvalidate 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 unlinked directory so we have a deletion record */
|
|
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)
|
|
return;
|
|
|
|
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)
|
|
return 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 < 1)
|
|
return YAFFS_OK;
|
|
|
|
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.-------------------*/
|
|
|
|
/* alloc_empty_obj gets us a clean Object.*/
|
|
static struct yaffs_obj *yaffs_alloc_empty_obj(struct yaffs_dev *dev)
|
|
{
|
|
struct yaffs_obj *obj = yaffs_alloc_raw_obj(dev);
|
|
|
|
if (!obj)
|
|
return 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);
|
|
int found = 0;
|
|
struct list_head *i;
|
|
u32 n = (u32) bucket;
|
|
|
|
/* Now find an object value that has not already been taken
|
|
* by scanning the list.
|
|
*/
|
|
|
|
while (!found) {
|
|
found = 1;
|
|
n += YAFFS_NOBJECT_BUCKETS;
|
|
list_for_each(i, &dev->obj_bucket[bucket].list) {
|
|
/* If there is already one in the list */
|
|
if (list_entry(i, struct yaffs_obj,
|
|
hash_link)->obj_id == n) {
|
|
found = 0;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
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 */
|
|
in = list_entry(i, struct yaffs_obj, hash_link);
|
|
if (in->obj_id == number) {
|
|
/* Don't show 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;
|
|
}
|
|
|
|
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 =
|
|
yaffs_max_file_size(dev);
|
|
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)
|
|
return NULL;
|
|
|
|
obj->fake = 1; /* it is fake so it might not use NAND */
|
|
obj->rename_allowed = 0;
|
|
obj->unlink_allowed = 0;
|
|
obj->deleted = 0;
|
|
obj->unlinked = 0;
|
|
obj->yst_mode = mode;
|
|
obj->my_dev = dev;
|
|
obj->hdr_chunk = 0; /* 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 = yaffs_strnlen(str, YAFFS_MAX_ALIAS_LENGTH);
|
|
new_str = kmalloc((len + 1) * sizeof(YCHAR), GFP_NOFS);
|
|
if (new_str) {
|
|
yaffs_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) {
|
|
kfree(str);
|
|
return NULL;
|
|
}
|
|
|
|
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 */
|
|
yaffs_del_obj(in);
|
|
in = NULL;
|
|
}
|
|
|
|
if (in)
|
|
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 obj */
|
|
equiv_obj = yaffs_get_equivalent_obj(equiv_obj);
|
|
|
|
if (yaffs_create_obj(YAFFS_OBJECT_TYPE_HARDLINK,
|
|
parent, name, 0, 0, 0,
|
|
equiv_obj, NULL, 0))
|
|
return equiv_obj;
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*---------------------- Block Management and Page Allocation -------------*/
|
|
|
|
static void yaffs_deinit_blocks(struct yaffs_dev *dev)
|
|
{
|
|
if (dev->block_info_alt && dev->block_info)
|
|
vfree(dev->block_info);
|
|
else
|
|
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
|
|
kfree(dev->chunk_bits);
|
|
dev->chunk_bits_alt = 0;
|
|
dev->chunk_bits = NULL;
|
|
}
|
|
|
|
static int yaffs_init_blocks(struct yaffs_dev *dev)
|
|
{
|
|
int n_blocks = dev->internal_end_block - dev->internal_start_block + 1;
|
|
|
|
dev->block_info = NULL;
|
|
dev->chunk_bits = NULL;
|
|
dev->alloc_block = -1; /* 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)
|
|
goto alloc_error;
|
|
|
|
/* 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->chunk_bits)
|
|
goto alloc_error;
|
|
|
|
|
|
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;
|
|
|
|
alloc_error:
|
|
yaffs_deinit_blocks(dev);
|
|
return YAFFS_FAIL;
|
|
}
|
|
|
|
|
|
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;
|
|
int i;
|
|
|
|
/* 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 */
|
|
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);
|
|
}
|
|
}
|
|
|
|
/* Verify erasure if needed */
|
|
if (erased_ok &&
|
|
((yaffs_trace_mask & YAFFS_TRACE_ERASE) ||
|
|
!yaffs_skip_verification(dev))) {
|
|
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) {
|
|
/* 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);
|
|
return;
|
|
}
|
|
|
|
/* 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;
|
|
bi->has_summary = 0;
|
|
|
|
yaffs_clear_chunk_bits(dev, block_no);
|
|
|
|
yaffs_trace(YAFFS_TRACE_ERASE, "Erased block %d", block_no);
|
|
}
|
|
|
|
static inline int yaffs_gc_process_chunk(struct yaffs_dev *dev,
|
|
struct yaffs_block_info *bi,
|
|
int old_chunk, u8 *buffer)
|
|
{
|
|
int new_chunk;
|
|
int mark_flash = 1;
|
|
struct yaffs_ext_tags tags;
|
|
struct yaffs_obj *object;
|
|
int matching_chunk;
|
|
int ret_val = YAFFS_OK;
|
|
|
|
memset(&tags, 0, sizeof(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)
|
|
/* Defeat the test */
|
|
matching_chunk = old_chunk;
|
|
else
|
|
matching_chunk =
|
|
yaffs_find_chunk_in_file
|
|
(object, tags.chunk_id,
|
|
NULL);
|
|
|
|
if (old_chunk != matching_chunk)
|
|
yaffs_trace(YAFFS_TRACE_ERROR,
|
|
"gc: page in gc mismatch: %d %d %d %d",
|
|
old_chunk,
|
|
matching_chunk,
|
|
tags.obj_id,
|
|
tags.chunk_id);
|
|
}
|
|
|
|
if (!object) {
|
|
yaffs_trace(YAFFS_TRACE_ERROR,
|
|
"page %d in gc has no object: %d %d %d ",
|
|
old_chunk,
|
|
tags.obj_id, tags.chunk_id,
|
|
tags.n_bytes);
|
|
}
|
|
|
|
if (object &&
|
|
object->deleted &&
|
|
object->soft_del && tags.chunk_id != 0) {
|
|
/* 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 obj */
|
|
dev->gc_cleanup_list[dev->n_clean_ups] = tags.obj_id;
|
|
dev->n_clean_ups++;
|
|
}
|
|
mark_flash = 0;
|
|
} 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 since its
|
|
* work is done.
|
|
* Also need to clean up
|
|
* shadowing.
|
|
*/
|
|
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) {
|
|
yaffs_oh_size_load(oh,
|
|
object->variant.file_variant.file_size);
|
|
tags.extra_file_size =
|
|
object->variant.file_variant.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 {
|
|
|
|
/* 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 */
|
|
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__);
|
|
return ret_val;
|
|
}
|
|
|
|
static int yaffs_gc_block(struct yaffs_dev *dev, int block, int whole_block)
|
|
{
|
|
int old_chunk;
|
|
int ret_val = YAFFS_OK;
|
|
int i;
|
|
int is_checkpt_block;
|
|
int max_copies;
|
|
int chunks_before = yaffs_get_erased_chunks(dev);
|
|
int chunks_after;
|
|
struct yaffs_block_info *bi = yaffs_get_block_info(dev, block);
|
|
|
|
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;
|
|
|
|
yaffs_summary_gc(dev, block);
|
|
|
|
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);
|
|
|
|
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)) {
|
|
/* Page is in use and might need to be copied */
|
|
max_copies--;
|
|
ret_val = yaffs_gc_process_chunk(dev, bi,
|
|
old_chunk, buffer);
|
|
}
|
|
}
|
|
yaffs_release_temp_buffer(dev, buffer);
|
|
}
|
|
|
|
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 */
|
|
struct yaffs_obj *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;
|
|
}
|
|
|
|
/*
|
|
* find_gc_block() selects 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 (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 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 only accepts 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.
|
|
* Only loops 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) {
|
|
|
|
memset(&tags, 0, sizeof(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_SCAN ||
|
|
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_SCAN) {
|
|
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 */
|
|
memset(&new_tags, 0, sizeof(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);
|
|
BUG();
|
|
}
|
|
|
|
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);
|
|
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);
|
|
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 *buf;
|
|
struct yaffs_obj_hdr *oh;
|
|
struct yaffs_dev *dev;
|
|
struct yaffs_ext_tags tags;
|
|
|
|
if (!in || !in->lazy_loaded || in->hdr_chunk < 1)
|
|
return;
|
|
|
|
dev = in->my_dev;
|
|
in->lazy_loaded = 0;
|
|
buf = yaffs_get_temp_buffer(dev);
|
|
|
|
yaffs_rd_chunk_tags_nand(dev, in->hdr_chunk, buf, &tags);
|
|
oh = (struct yaffs_obj_hdr *)buf;
|
|
|
|
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);
|
|
}
|
|
yaffs_release_temp_buffer(dev, buf);
|
|
}
|
|
|
|
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 {
|
|
yaffs_strncpy(name, oh_name + 1, buff_size - 1);
|
|
}
|
|
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
yaffs_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 convert unicode to ascii */
|
|
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 {
|
|
/* Unicode name, so save starting at the second YCHAR */
|
|
*oh_name = 0;
|
|
yaffs_strncpy(oh_name + 1, name, YAFFS_MAX_NAME_LENGTH - 2);
|
|
}
|
|
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
yaffs_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 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;
|
|
loff_t file_size = 0;
|
|
|
|
yaffs_strcpy(old_name, _Y("silly old name"));
|
|
|
|
if (in->fake && in != dev->root_dir && !force && !xmod)
|
|
return ret_val;
|
|
|
|
yaffs_check_gc(dev, 0);
|
|
yaffs_check_obj_details_loaded(in);
|
|
|
|
buffer = yaffs_get_temp_buffer(in->my_dev);
|
|
oh = (struct yaffs_obj_hdr *)buffer;
|
|
|
|
prev_chunk_id = in->hdr_chunk;
|
|
|
|
if (prev_chunk_id > 0) {
|
|
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:
|
|
if (oh->parent_obj_id != YAFFS_OBJECTID_DELETED &&
|
|
oh->parent_obj_id != YAFFS_OBJECTID_UNLINKED)
|
|
file_size = in->variant.file_variant.file_size;
|
|
yaffs_oh_size_load(oh, 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");
|
|
yaffs_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 */
|
|
memset(&new_tags, 0, sizeof(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_file_size = 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 (buffer)
|
|
yaffs_release_temp_buffer(dev, buffer);
|
|
|
|
if (new_chunk_id < 0)
|
|
return new_chunk_id;
|
|
|
|
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;
|
|
}
|
|
|
|
|
|
return new_chunk_id;
|
|
}
|
|
|
|
/*--------------------- 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) {
|
|
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);
|
|
yaffs_rd_data_obj(in, chunk, local_buffer);
|
|
|
|
memcpy(buffer, &local_buffer[start], n_copy);
|
|
|
|
yaffs_release_temp_buffer(dev, local_buffer);
|
|
}
|
|
} else {
|
|
/* A full chunk. Read directly into the 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_through)
|
|
{
|
|
|
|
int chunk;
|
|
u32 start;
|
|
int n_copy;
|
|
int n = n_bytes;
|
|
int n_done = 0;
|
|
int n_writeback;
|
|
loff_t start_write = offset;
|
|
int chunk_written = 0;
|
|
u32 n_bytes_read;
|
|
loff_t 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 (((loff_t)chunk) *
|
|
dev->data_bytes_per_chunk + start != offset ||
|
|
start >= dev->data_bytes_per_chunk) {
|
|
yaffs_trace(YAFFS_TRACE_ERROR,
|
|
"AddrToChunk of offset %lld gives chunk %d start %d",
|
|
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 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 = (((loff_t)(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)
|
|
BUG();
|
|
|
|
} 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_through) {
|
|
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 write */
|
|
}
|
|
} else {
|
|
/* An incomplete start or end chunk (or maybe
|
|
* both start and end chunk). Read into the
|
|
* local buffer then copy over and write back.
|
|
*/
|
|
|
|
u8 *local_buffer = yaffs_get_temp_buffer(dev);
|
|
|
|
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);
|
|
}
|
|
} else {
|
|
/* A full chunk. Write directly from the 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_through)
|
|
{
|
|
yaffs2_handle_hole(in, offset);
|
|
return yaffs_do_file_wr(in, buffer, offset, n_bytes, write_through);
|
|
}
|
|
|
|
/* ---------------------- File resizing stuff ------------------ */
|
|
|
|
static void yaffs_prune_chunks(struct yaffs_obj *in, loff_t new_size)
|
|
{
|
|
|
|
struct yaffs_dev *dev = in->my_dev;
|
|
loff_t old_size = in->variant.file_variant.file_size;
|
|
int i;
|
|
int chunk_id;
|
|
u32 dummy;
|
|
int last_del;
|
|
int start_del;
|
|
|
|
if (old_size > 0)
|
|
yaffs_addr_to_chunk(dev, old_size - 1, &last_del, &dummy);
|
|
else
|
|
last_del = 0;
|
|
|
|
yaffs_addr_to_chunk(dev, new_size + dev->data_bytes_per_chunk - 1,
|
|
&start_del, &dummy);
|
|
last_del++;
|
|
start_del++;
|
|
|
|
/* 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 < 1)
|
|
continue;
|
|
|
|
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);
|
|
|
|
/* 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);
|
|
}
|
|
|
|
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;
|
|
loff_t 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)
|
|
{
|
|
if (!in->dirty)
|
|
return YAFFS_OK;
|
|
|
|
yaffs_flush_file_cache(in);
|
|
|
|
if (data_sync)
|
|
return YAFFS_OK;
|
|
|
|
if (update_time)
|
|
yaffs_load_current_time(in, 0, 0);
|
|
|
|
return (yaffs_update_oh(in, NULL, 0, 0, 0, NULL) >= 0) ?
|
|
YAFFS_OK : YAFFS_FAIL;
|
|
}
|
|
|
|
|
|
/* 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)
|
|
{
|
|
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 associated 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)
|
|
return YAFFS_FAIL;
|
|
|
|
if (!obj->my_inode)
|
|
del_now = 1;
|
|
|
|
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 works.
|
|
* - 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) {
|
|
BUG();
|
|
return YAFFS_FAIL;
|
|
}
|
|
if (!new_dir || new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
|
|
BUG();
|
|
return YAFFS_FAIL;
|
|
}
|
|
|
|
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 &&
|
|
yaffs_strcmp(old_name, new_name) == 0)
|
|
force = 1;
|
|
#endif
|
|
|
|
if (yaffs_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 handle 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 here 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 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. */
|
|
}
|
|
|
|
void yaffs_link_fixup(struct yaffs_dev *dev, struct list_head *hard_list)
|
|
{
|
|
struct list_head *lh;
|
|
struct list_head *save;
|
|
struct yaffs_obj *hl;
|
|
struct yaffs_obj *in;
|
|
|
|
list_for_each_safe(lh, save, hard_list) {
|
|
hl = list_entry(lh, struct yaffs_obj, hard_links);
|
|
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) {
|
|
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) {
|
|
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) {
|
|
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)
|
|
BUG();
|
|
|
|
list_for_each_safe(lh, n, &dir->variant.dir_variant.children) {
|
|
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);
|
|
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"
|
|
);
|
|
BUG();
|
|
return NULL;
|
|
}
|
|
if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
|
|
yaffs_trace(YAFFS_TRACE_ALWAYS,
|
|
"tragedy: yaffs_find_by_name: non-directory"
|
|
);
|
|
BUG();
|
|
}
|
|
|
|
sum = yaffs_calc_name_sum(name);
|
|
|
|
list_for_each(i, &directory->variant.dir_variant.children) {
|
|
l = list_entry(i, struct yaffs_obj, siblings);
|
|
|
|
if (l->parent != directory)
|
|
BUG();
|
|
|
|
yaffs_check_obj_details_loaded(l);
|
|
|
|
/* Special case for lost-n-found */
|
|
if (l->obj_id == YAFFS_OBJECTID_LOSTNFOUND) {
|
|
if (!yaffs_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 (!yaffs_strncmp(name, buffer, YAFFS_MAX_NAME_LENGTH))
|
|
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) {
|
|
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 (yaffs_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 */
|
|
yaffs_strcpy(local_name, YAFFS_LOSTNFOUND_PREFIX);
|
|
yaffs_strcat(local_name, x);
|
|
yaffs_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) {
|
|
yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffer_size - 1);
|
|
} else if (obj->short_name[0]) {
|
|
yaffs_strcpy(name, obj->short_name);
|
|
} else if (obj->hdr_chunk > 0) {
|
|
u8 *buffer = yaffs_get_temp_buffer(obj->my_dev);
|
|
|
|
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) {
|
|
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);
|
|
}
|
|
|
|
yaffs_fix_null_name(obj, name, buffer_size);
|
|
|
|
return yaffs_strnlen(name, YAFFS_MAX_NAME_LENGTH);
|
|
}
|
|
|
|
loff_t 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 yaffs_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;
|
|
return DT_REG;
|
|
break;
|
|
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;
|
|
|
|
/* 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;
|
|
|
|
/* 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+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;
|
|
}
|
|
|
|
if (dev->is_mounted) {
|
|
yaffs_trace(YAFFS_TRACE_ALWAYS, "device already mounted");
|
|
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;
|
|
}
|
|
|
|
/* Finished with most checks. Further 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;
|
|
}
|
|
|
|
/* Finished verifying the device, 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 && dev->param.is_yaffs2 &&
|
|
!dev->param.disable_summary &&
|
|
!yaffs_summary_init(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 then 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_retried_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);
|
|
yaffs_summary_deinit(dev);
|
|
|
|
if (dev->param.n_caches > 0 && dev->cache) {
|
|
|
|
for (i = 0; i < dev->param.n_caches; i++) {
|
|
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 and subtract the number of dirty chunks in the cache. */
|
|
|
|
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 figure checkpoint space 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;
|
|
}
|
|
|
|
/*\
|
|
* Marshalling functions to get loff_t file sizes into aand out of
|
|
* object headers.
|
|
*/
|
|
void yaffs_oh_size_load(struct yaffs_obj_hdr *oh, loff_t fsize)
|
|
{
|
|
oh->file_size_low = (fsize & 0xFFFFFFFF);
|
|
oh->file_size_high = ((fsize >> 32) & 0xFFFFFFFF);
|
|
}
|
|
|
|
loff_t yaffs_oh_to_size(struct yaffs_obj_hdr *oh)
|
|
{
|
|
loff_t retval;
|
|
|
|
if (~(oh->file_size_high))
|
|
retval = (((loff_t) oh->file_size_high) << 32) |
|
|
(((loff_t) oh->file_size_low) & 0xFFFFFFFF);
|
|
else
|
|
retval = (loff_t) oh->file_size_low;
|
|
|
|
return retval;
|
|
}
|