2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
4 * Copyright (C) 2002-2011 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
7 * Created by Charles Manning <charles@aleph1.co.uk>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
13 * This file handles the marshalling (ie internal<-->external structure
14 * translation between the internal tags and the stored tags in Yaffs2-style
18 #include "yaffs_guts.h"
19 #include "yaffs_trace.h"
20 #include "yaffs_packedtags2.h"
22 static int yaffs_tags_marshall_write(struct yaffs_dev *dev,
23 int nand_chunk, const u8 *data,
24 const struct yaffs_ext_tags *tags)
26 struct yaffs_packed_tags2 pt;
29 int packed_tags_size =
30 dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt);
31 void *packed_tags_ptr =
32 dev->param.no_tags_ecc ? (void *)&pt.t : (void *)&pt;
34 yaffs_trace(YAFFS_TRACE_MTD,
35 "yaffs_tags_marshall_write chunk %d data %p tags %p",
36 nand_chunk, data, tags);
38 /* For yaffs2 writing there must be both data and tags.
39 * If we're using inband tags, then the tags are stuffed into
40 * the end of the data buffer.
44 else if (dev->param.inband_tags) {
45 struct yaffs_packed_tags2_tags_only *pt2tp;
47 (struct yaffs_packed_tags2_tags_only *)(data +
49 data_bytes_per_chunk);
50 yaffs_pack_tags2_tags_only(dev, pt2tp, tags);
52 yaffs_pack_tags2(dev, &pt, tags, !dev->param.no_tags_ecc);
55 retval = dev->drv.drv_write_chunk_fn(dev, nand_chunk,
56 data, dev->param.total_bytes_per_chunk,
57 (dev->param.inband_tags) ? NULL : packed_tags_ptr,
58 (dev->param.inband_tags) ? 0 : packed_tags_size);
63 static int yaffs_tags_marshall_read(struct yaffs_dev *dev,
64 int nand_chunk, u8 *data,
65 struct yaffs_ext_tags *tags)
70 enum yaffs_ecc_result ecc_result;
72 struct yaffs_packed_tags2 pt;
74 int packed_tags_size =
75 dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt);
76 void *packed_tags_ptr =
77 dev->param.no_tags_ecc ? (void *)&pt.t : (void *)&pt;
79 yaffs_trace(YAFFS_TRACE_MTD,
80 "yaffs_tags_marshall_read chunk %d data %p tags %p",
81 nand_chunk, data, tags);
83 if (dev->param.inband_tags) {
86 data = yaffs_get_temp_buffer(dev);
90 if (dev->param.inband_tags || (data && !tags))
91 retval = dev->drv.drv_read_chunk_fn(dev, nand_chunk,
92 data, dev->param.total_bytes_per_chunk,
96 retval = dev->drv.drv_read_chunk_fn(dev, nand_chunk,
97 data, dev->param.total_bytes_per_chunk,
98 spare_buffer, packed_tags_size,
104 if (retval == YAFFS_FAIL)
107 if (dev->param.inband_tags) {
109 struct yaffs_packed_tags2_tags_only *pt2tp;
111 (struct yaffs_packed_tags2_tags_only *)
112 &data[dev->data_bytes_per_chunk];
113 yaffs_unpack_tags2_tags_only(dev, tags, pt2tp);
116 memcpy(packed_tags_ptr, spare_buffer, packed_tags_size);
117 yaffs_unpack_tags2(dev, tags, &pt, !dev->param.no_tags_ecc);
121 yaffs_release_temp_buffer(dev, data);
123 if (tags && ecc_result == YAFFS_ECC_RESULT_UNFIXED) {
124 tags->ecc_result = YAFFS_ECC_RESULT_UNFIXED;
125 dev->n_ecc_unfixed++;
128 if (tags && ecc_result == YAFFS_ECC_RESULT_FIXED) {
129 if (tags->ecc_result <= YAFFS_ECC_RESULT_NO_ERROR)
130 tags->ecc_result = YAFFS_ECC_RESULT_FIXED;
134 if (ecc_result < YAFFS_ECC_RESULT_UNFIXED)
140 static int yaffs_tags_marshall_query_block(struct yaffs_dev *dev, int block_no,
141 enum yaffs_block_state *state,
146 yaffs_trace(YAFFS_TRACE_MTD, "yaffs_tags_marshall_query_block %d",
149 retval = dev->drv.drv_check_bad_fn(dev, block_no);
151 if (retval== YAFFS_FAIL) {
152 yaffs_trace(YAFFS_TRACE_MTD, "block is bad");
154 *state = YAFFS_BLOCK_STATE_DEAD;
157 struct yaffs_ext_tags t;
159 yaffs_tags_marshall_read(dev,
160 block_no * dev->param.chunks_per_block,
164 *seq_number = t.seq_number;
165 *state = YAFFS_BLOCK_STATE_NEEDS_SCAN;
168 *state = YAFFS_BLOCK_STATE_EMPTY;
172 yaffs_trace(YAFFS_TRACE_MTD,
173 "block query returns seq %d state %d",
174 *seq_number, *state);
182 static int yaffs_tags_marshall_mark_bad(struct yaffs_dev *dev, int block_no)
184 return dev->drv.drv_mark_bad_fn(dev, block_no);
189 void yaffs_tags_marshall_install(struct yaffs_dev *dev)
191 if (!dev->param.is_yaffs2)
194 if (!dev->tagger.write_chunk_tags_fn)
195 dev->tagger.write_chunk_tags_fn = yaffs_tags_marshall_write;
197 if (!dev->tagger.read_chunk_tags_fn)
198 dev->tagger.read_chunk_tags_fn = yaffs_tags_marshall_read;
200 if (!dev->tagger.query_block_fn)
201 dev->tagger.query_block_fn = yaffs_tags_marshall_query_block;
203 if (!dev->tagger.mark_bad_fn)
204 dev->tagger.mark_bad_fn = yaffs_tags_marshall_mark_bad;