diff options
Diffstat (limited to 'target/linux/generic/files/fs/yaffs2/yaffs_checkptrw.c')
| -rw-r--r-- | target/linux/generic/files/fs/yaffs2/yaffs_checkptrw.c | 466 |
1 files changed, 0 insertions, 466 deletions
diff --git a/target/linux/generic/files/fs/yaffs2/yaffs_checkptrw.c b/target/linux/generic/files/fs/yaffs2/yaffs_checkptrw.c deleted file mode 100644 index 16ee1e0695..0000000000 --- a/target/linux/generic/files/fs/yaffs2/yaffs_checkptrw.c +++ /dev/null @@ -1,466 +0,0 @@ -/* - * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. - * - * Copyright (C) 2002-2011 Aleph One Ltd. - * for Toby Churchill Ltd and Brightstar Engineering - * - * Created by Charles Manning <charles@aleph1.co.uk> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ - -#include "yaffs_checkptrw.h" -#include "yaffs_getblockinfo.h" - -struct yaffs_checkpt_chunk_hdr { - int version; - int seq; - u32 sum; - u32 xor; -} ; - - -static int apply_chunk_offset(struct yaffs_dev *dev, int chunk) -{ - return chunk - dev->chunk_offset; -} - -static int apply_block_offset(struct yaffs_dev *dev, int block) -{ - return block - dev->block_offset; -} - -static void yaffs2_checkpt_init_chunk_hdr(struct yaffs_dev *dev) -{ - struct yaffs_checkpt_chunk_hdr hdr; - - hdr.version = YAFFS_CHECKPOINT_VERSION; - hdr.seq = dev->checkpt_page_seq; - hdr.sum = dev->checkpt_sum; - hdr.xor = dev->checkpt_xor; - - dev->checkpt_byte_offs = sizeof(hdr); - - memcpy(dev->checkpt_buffer, &hdr, sizeof(hdr)); -} - -static int yaffs2_checkpt_check_chunk_hdr(struct yaffs_dev *dev) -{ - struct yaffs_checkpt_chunk_hdr hdr; - - memcpy(&hdr, dev->checkpt_buffer, sizeof(hdr)); - - dev->checkpt_byte_offs = sizeof(hdr); - - return hdr.version == YAFFS_CHECKPOINT_VERSION && - hdr.seq == dev->checkpt_page_seq && - hdr.sum == dev->checkpt_sum && - hdr.xor == dev->checkpt_xor; -} - -static int yaffs2_checkpt_space_ok(struct yaffs_dev *dev) -{ - int blocks_avail = dev->n_erased_blocks - dev->param.n_reserved_blocks; - - yaffs_trace(YAFFS_TRACE_CHECKPOINT, - "checkpt blocks_avail = %d", blocks_avail); - - return (blocks_avail <= 0) ? 0 : 1; -} - -static int yaffs_checkpt_erase(struct yaffs_dev *dev) -{ - int i; - - if (!dev->drv.drv_erase_fn) - return 0; - yaffs_trace(YAFFS_TRACE_CHECKPOINT, - "checking blocks %d to %d", - dev->internal_start_block, dev->internal_end_block); - - for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) { - struct yaffs_block_info *bi = yaffs_get_block_info(dev, i); - int offset_i = apply_block_offset(dev, i); - int result; - - if (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT) { - yaffs_trace(YAFFS_TRACE_CHECKPOINT, - "erasing checkpt block %d", i); - - dev->n_erasures++; - - result = dev->drv.drv_erase_fn(dev, offset_i); - if(result) { - bi->block_state = YAFFS_BLOCK_STATE_EMPTY; - dev->n_erased_blocks++; - dev->n_free_chunks += - dev->param.chunks_per_block; - } else { - dev->drv.drv_mark_bad_fn(dev, offset_i); - bi->block_state = YAFFS_BLOCK_STATE_DEAD; - } - } - } - - dev->blocks_in_checkpt = 0; - - return 1; -} - -static void yaffs2_checkpt_find_erased_block(struct yaffs_dev *dev) -{ - int i; - int blocks_avail = dev->n_erased_blocks - dev->param.n_reserved_blocks; - - yaffs_trace(YAFFS_TRACE_CHECKPOINT, - "allocating checkpt block: erased %d reserved %d avail %d next %d ", - dev->n_erased_blocks, dev->param.n_reserved_blocks, - blocks_avail, dev->checkpt_next_block); - - if (dev->checkpt_next_block >= 0 && - dev->checkpt_next_block <= dev->internal_end_block && - blocks_avail > 0) { - - for (i = dev->checkpt_next_block; i <= dev->internal_end_block; - i++) { - struct yaffs_block_info *bi; - - bi = yaffs_get_block_info(dev, i); - if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) { - dev->checkpt_next_block = i + 1; - dev->checkpt_cur_block = i; - yaffs_trace(YAFFS_TRACE_CHECKPOINT, - "allocating checkpt block %d", i); - return; - } - } - } - yaffs_trace(YAFFS_TRACE_CHECKPOINT, "out of checkpt blocks"); - - dev->checkpt_next_block = -1; - dev->checkpt_cur_block = -1; -} - -static void yaffs2_checkpt_find_block(struct yaffs_dev *dev) -{ - int i; - struct yaffs_ext_tags tags; - - yaffs_trace(YAFFS_TRACE_CHECKPOINT, - "find next checkpt block: start: blocks %d next %d", - dev->blocks_in_checkpt, dev->checkpt_next_block); - - if (dev->blocks_in_checkpt < dev->checkpt_max_blocks) - for (i = dev->checkpt_next_block; i <= dev->internal_end_block; - i++) { - int chunk = i * dev->param.chunks_per_block; - enum yaffs_block_state state; - u32 seq; - - dev->tagger.read_chunk_tags_fn(dev, - apply_chunk_offset(dev, chunk), - NULL, &tags); - yaffs_trace(YAFFS_TRACE_CHECKPOINT, - "find next checkpt block: search: block %d state %d oid %d seq %d eccr %d", - i, (int) state, - tags.obj_id, tags.seq_number, - tags.ecc_result); - - if (tags.seq_number != YAFFS_SEQUENCE_CHECKPOINT_DATA) - continue; - - dev->tagger.query_block_fn(dev, - apply_block_offset(dev, i), - &state, &seq); - if (state == YAFFS_BLOCK_STATE_DEAD) - continue; - - /* Right kind of block */ - dev->checkpt_next_block = tags.obj_id; - dev->checkpt_cur_block = i; - dev->checkpt_block_list[dev->blocks_in_checkpt] = i; - dev->blocks_in_checkpt++; - yaffs_trace(YAFFS_TRACE_CHECKPOINT, - "found checkpt block %d", i); - return; - } - - yaffs_trace(YAFFS_TRACE_CHECKPOINT, "found no more checkpt blocks"); - - dev->checkpt_next_block = -1; - dev->checkpt_cur_block = -1; -} - -int yaffs2_checkpt_open(struct yaffs_dev *dev, int writing) -{ - int i; - - dev->checkpt_open_write = writing; - - /* Got the functions we need? */ - if (!dev->tagger.write_chunk_tags_fn || - !dev->tagger.read_chunk_tags_fn || - !dev->drv.drv_erase_fn || - !dev->drv.drv_mark_bad_fn) - return 0; - - if (writing && !yaffs2_checkpt_space_ok(dev)) - return 0; - - if (!dev->checkpt_buffer) - dev->checkpt_buffer = - kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS); - if (!dev->checkpt_buffer) - return 0; - - dev->checkpt_page_seq = 0; - dev->checkpt_byte_count = 0; - dev->checkpt_sum = 0; - dev->checkpt_xor = 0; - dev->checkpt_cur_block = -1; - dev->checkpt_cur_chunk = -1; - dev->checkpt_next_block = dev->internal_start_block; - - if (writing) { - memset(dev->checkpt_buffer, 0, dev->data_bytes_per_chunk); - yaffs2_checkpt_init_chunk_hdr(dev); - return yaffs_checkpt_erase(dev); - } - - /* Opening for a read */ - /* Set to a value that will kick off a read */ - dev->checkpt_byte_offs = dev->data_bytes_per_chunk; - /* A checkpoint block list of 1 checkpoint block per 16 block is - * (hopefully) going to be way more than we need */ - dev->blocks_in_checkpt = 0; - dev->checkpt_max_blocks = - (dev->internal_end_block - dev->internal_start_block) / 16 + 2; - if (!dev->checkpt_block_list) - dev->checkpt_block_list = - kmalloc(sizeof(int) * dev->checkpt_max_blocks, GFP_NOFS); - - if (!dev->checkpt_block_list) - return 0; - - for (i = 0; i < dev->checkpt_max_blocks; i++) - dev->checkpt_block_list[i] = -1; - - return 1; -} - -int yaffs2_get_checkpt_sum(struct yaffs_dev *dev, u32 * sum) -{ - u32 composite_sum; - - composite_sum = (dev->checkpt_sum << 8) | (dev->checkpt_xor & 0xff); - *sum = composite_sum; - return 1; -} - -static int yaffs2_checkpt_flush_buffer(struct yaffs_dev *dev) -{ - int chunk; - int offset_chunk; - struct yaffs_ext_tags tags; - - if (dev->checkpt_cur_block < 0) { - yaffs2_checkpt_find_erased_block(dev); - dev->checkpt_cur_chunk = 0; - } - - if (dev->checkpt_cur_block < 0) - return 0; - - tags.is_deleted = 0; - tags.obj_id = dev->checkpt_next_block; /* Hint to next place to look */ - tags.chunk_id = dev->checkpt_page_seq + 1; - tags.seq_number = YAFFS_SEQUENCE_CHECKPOINT_DATA; - tags.n_bytes = dev->data_bytes_per_chunk; - if (dev->checkpt_cur_chunk == 0) { - /* First chunk we write for the block? Set block state to - checkpoint */ - struct yaffs_block_info *bi = - yaffs_get_block_info(dev, dev->checkpt_cur_block); - bi->block_state = YAFFS_BLOCK_STATE_CHECKPOINT; - dev->blocks_in_checkpt++; - } - - chunk = - dev->checkpt_cur_block * dev->param.chunks_per_block + - dev->checkpt_cur_chunk; - - yaffs_trace(YAFFS_TRACE_CHECKPOINT, - "checkpoint wite buffer nand %d(%d:%d) objid %d chId %d", - chunk, dev->checkpt_cur_block, dev->checkpt_cur_chunk, - tags.obj_id, tags.chunk_id); - - offset_chunk = apply_chunk_offset(dev, chunk); - - dev->n_page_writes++; - - dev->tagger.write_chunk_tags_fn(dev, offset_chunk, - dev->checkpt_buffer, &tags); - dev->checkpt_page_seq++; - dev->checkpt_cur_chunk++; - if (dev->checkpt_cur_chunk >= dev->param.chunks_per_block) { - dev->checkpt_cur_chunk = 0; - dev->checkpt_cur_block = -1; - } - memset(dev->checkpt_buffer, 0, dev->data_bytes_per_chunk); - - yaffs2_checkpt_init_chunk_hdr(dev); - - - return 1; -} - -int yaffs2_checkpt_wr(struct yaffs_dev *dev, const void *data, int n_bytes) -{ - int i = 0; - int ok = 1; - u8 *data_bytes = (u8 *) data; - - if (!dev->checkpt_buffer) - return 0; - - if (!dev->checkpt_open_write) - return -1; - - while (i < n_bytes && ok) { - dev->checkpt_buffer[dev->checkpt_byte_offs] = *data_bytes; - dev->checkpt_sum += *data_bytes; - dev->checkpt_xor ^= *data_bytes; - - dev->checkpt_byte_offs++; - i++; - data_bytes++; - dev->checkpt_byte_count++; - - if (dev->checkpt_byte_offs < 0 || - dev->checkpt_byte_offs >= dev->data_bytes_per_chunk) - ok = yaffs2_checkpt_flush_buffer(dev); - } - - return i; -} - -int yaffs2_checkpt_rd(struct yaffs_dev *dev, void *data, int n_bytes) -{ - int i = 0; - struct yaffs_ext_tags tags; - int chunk; - int offset_chunk; - u8 *data_bytes = (u8 *) data; - - if (!dev->checkpt_buffer) - return 0; - - if (dev->checkpt_open_write) - return -1; - - while (i < n_bytes) { - - if (dev->checkpt_byte_offs < 0 || - dev->checkpt_byte_offs >= dev->data_bytes_per_chunk) { - - if (dev->checkpt_cur_block < 0) { - yaffs2_checkpt_find_block(dev); - dev->checkpt_cur_chunk = 0; - } - - /* Bail out if we can't find a checpoint block */ - if (dev->checkpt_cur_block < 0) - break; - - chunk = dev->checkpt_cur_block * - dev->param.chunks_per_block + - dev->checkpt_cur_chunk; - - offset_chunk = apply_chunk_offset(dev, chunk); - dev->n_page_reads++; - - /* Read in the next chunk */ - dev->tagger.read_chunk_tags_fn(dev, - offset_chunk, - dev->checkpt_buffer, - &tags); - - /* Bail out if the chunk is corrupted. */ - if (tags.chunk_id != (dev->checkpt_page_seq + 1) || - tags.ecc_result > YAFFS_ECC_RESULT_FIXED || - tags.seq_number != YAFFS_SEQUENCE_CHECKPOINT_DATA) - break; - - /* Bail out if it is not a checkpoint chunk. */ - if(!yaffs2_checkpt_check_chunk_hdr(dev)) - break; - - dev->checkpt_page_seq++; - dev->checkpt_cur_chunk++; - - if (dev->checkpt_cur_chunk >= - dev->param.chunks_per_block) - dev->checkpt_cur_block = -1; - - } - - *data_bytes = dev->checkpt_buffer[dev->checkpt_byte_offs]; - dev->checkpt_sum += *data_bytes; - dev->checkpt_xor ^= *data_bytes; - dev->checkpt_byte_offs++; - i++; - data_bytes++; - dev->checkpt_byte_count++; - } - - return i; /* Number of bytes read */ -} - -int yaffs_checkpt_close(struct yaffs_dev *dev) -{ - int i; - - if (dev->checkpt_open_write) { - if (dev->checkpt_byte_offs != - sizeof(sizeof(struct yaffs_checkpt_chunk_hdr))) - yaffs2_checkpt_flush_buffer(dev); - } else if (dev->checkpt_block_list) { - for (i = 0; - i < dev->blocks_in_checkpt && - dev->checkpt_block_list[i] >= 0; i++) { - int blk = dev->checkpt_block_list[i]; - struct yaffs_block_info *bi = NULL; - - if (dev->internal_start_block <= blk && - blk <= dev->internal_end_block) - bi = yaffs_get_block_info(dev, blk); - if (bi && bi->block_state == YAFFS_BLOCK_STATE_EMPTY) - bi->block_state = YAFFS_BLOCK_STATE_CHECKPOINT; - } - } - - dev->n_free_chunks -= - dev->blocks_in_checkpt * dev->param.chunks_per_block; - dev->n_erased_blocks -= dev->blocks_in_checkpt; - - yaffs_trace(YAFFS_TRACE_CHECKPOINT, "checkpoint byte count %d", - dev->checkpt_byte_count); - - if (dev->checkpt_buffer) - return 1; - else - return 0; -} - -int yaffs2_checkpt_invalidate_stream(struct yaffs_dev *dev) -{ - /* Erase the checkpoint data */ - - yaffs_trace(YAFFS_TRACE_CHECKPOINT, - "checkpoint invalidate of %d blocks", - dev->blocks_in_checkpt); - - return yaffs_checkpt_erase(dev); -} |