3 * record.c -- tape record handling functions
5 * Kern Sibbald, April MMI
11 Copyright (C) 2000, 2001, 2002 Kern Sibbald and John Walker
13 This program is free software; you can redistribute it and/or
14 modify it under the terms of the GNU General Public License as
15 published by the Free Software Foundation; either version 2 of
16 the License, or (at your option) any later version.
18 This program is distributed in the hope that it will be useful,
19 but WITHOUT ANY WARRANTY; without even the implied warranty of
20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 General Public License for more details.
23 You should have received a copy of the GNU General Public
24 License along with this program; if not, write to the Free
25 Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
34 extern int debug_level;
37 * Convert a FileIndex into a printable
38 * ASCII string. Not reentrant.
39 * If the FileIndex is negative, it flags the
40 * record as a Label, otherwise it is simply
41 * the FileIndex of the current file.
43 char *FI_to_ascii(int fi)
47 sprintf(buf, "%d", fi);
62 sprintf(buf, "unknown: %d", fi);
69 * Convert a Stream ID into a printable
70 * ASCII string. Not reentrant.
72 char *stream_to_ascii(int stream)
76 case STREAM_UNIX_ATTRIBUTES:
78 case STREAM_FILE_DATA:
80 case STREAM_MD5_SIGNATURE:
82 case STREAM_GZIP_DATA:
85 sprintf(buf, "%d", stream);
91 * Return a new record entity
93 DEV_RECORD *new_record(void)
97 rec = (DEV_RECORD *) get_memory(sizeof(DEV_RECORD));
98 memset(rec, 0, sizeof(DEV_RECORD));
99 rec->data = get_pool_memory(PM_MESSAGE);
104 * Free the record entity
107 void free_record(DEV_RECORD *rec)
109 Dmsg0(150, "Enter free_record.\n");
110 free_pool_memory(rec->data);
111 Dmsg0(150, "Data buf is freed.\n");
112 free_pool_memory((POOLMEM *)rec);
113 Dmsg0(150, "Leave free_record.\n");
118 * Write a Record to the block
120 * Returns: 0 on failure (none or partially written)
121 * 1 on success (all bytes written)
123 * and remainder returned in packet.
125 * We require enough room for the header, and we deal with
126 * two special cases. 1. Only part of the record may have
127 * been transferred the last time (when remainder is
128 * non-zero), and 2. The remaining bytes to write may not
129 * all fit into the block.
131 int write_record_to_block(DEV_BLOCK *block, DEV_RECORD *rec)
136 sm_check(__FILE__, __LINE__, False);
137 remlen = block->buf_len - block->binbuf;
139 ASSERT(block->binbuf == (uint32_t) (block->bufp - block->buf));
142 Dmsg6(190, "write_record_to_block() FI=%s SessId=%d Strm=%s len=%d\n\
143 rem=%d remainder=%d\n",
144 FI_to_ascii(rec->FileIndex), rec->VolSessionId,
145 stream_to_ascii(rec->Stream), rec->data_len,
146 remlen, rec->remainder);
149 * If rec->remainder is non-zero, we have been called a
150 * second (or subsequent) time to finish writing a record
151 * that did not previously fit into the block.
153 if (rec->remainder == 0) {
154 /* Require enough room to write a full header */
155 if (remlen >= RECHDR_LENGTH) {
156 ser_begin(block->bufp, RECHDR_LENGTH);
157 ser_uint32(rec->VolSessionId);
158 ser_uint32(rec->VolSessionTime);
159 ser_int32(rec->FileIndex);
160 ser_int32(rec->Stream);
161 ser_uint32(rec->data_len);
162 ASSERT(ser_length(block->bufp) == RECHDR_LENGTH);
164 block->bufp += RECHDR_LENGTH;
165 block->binbuf += RECHDR_LENGTH;
166 remlen -= RECHDR_LENGTH;
167 rec->remainder = rec->data_len;
169 rec->remainder = rec->data_len + RECHDR_LENGTH;
170 sm_check(__FILE__, __LINE__, False);
175 * We are here to write unwritten bytes from a previous
176 * time. Presumably we have a new buffer (possibly
177 * containing a volume label), so the new header
178 * should be able to fit in the block -- otherwise we have
179 * an error. Note, we may have to continue splitting the
180 * data record though.
182 * First, write the header, then write as much as
183 * possible of the data record.
185 * Every time we write a header and it is a continuation
186 * of a previous partially written record, we store the
187 * Stream as -Stream in the record header.
189 ser_begin(block->bufp, RECHDR_LENGTH);
190 ser_uint32(rec->VolSessionId);
191 ser_uint32(rec->VolSessionTime);
192 ser_int32(rec->FileIndex);
193 if (rec->remainder > rec->data_len) {
194 ser_int32(rec->Stream); /* normal full header */
195 ser_uint32(rec->data_len);
196 rec->remainder = rec->data_len; /* must still do data record */
198 ser_int32(-rec->Stream); /* mark this as a continuation record */
199 ser_uint32(rec->remainder); /* bytes to do */
201 ASSERT(ser_length(block->bufp) == RECHDR_LENGTH);
203 /* Require enough room to write a full header */
204 ASSERT(remlen >= RECHDR_LENGTH);
206 block->bufp += RECHDR_LENGTH;
207 block->binbuf += RECHDR_LENGTH;
208 remlen -= RECHDR_LENGTH;
211 sm_check(__FILE__, __LINE__, False);
212 return 0; /* partial transfer */
216 * Now deal with data record.
217 * Part of it may have already been transferred, and we
218 * may not have enough room to transfer the whole this time.
220 if (rec->remainder > 0) {
221 /* Write as much of data as possible */
222 if (remlen >= rec->remainder) {
223 memcpy(block->bufp, rec->data+rec->data_len-rec->remainder,
225 block->bufp += rec->remainder;
226 block->binbuf += rec->remainder;
228 memcpy(block->bufp, rec->data+rec->data_len-rec->remainder,
230 if (!sm_check_rtn(__FILE__, __LINE__, False)) {
231 /* We damaged a buffer */
232 Dmsg6(0, "Damaged block FI=%s SessId=%d Strm=%s len=%d\n\
233 rem=%d remainder=%d\n",
234 FI_to_ascii(rec->FileIndex), rec->VolSessionId,
235 stream_to_ascii(rec->Stream), rec->data_len,
236 remlen, rec->remainder);
237 Dmsg5(0, "Damaged block: bufp=%x binbuf=%d buf_len=%d rem=%d moved=%d\n",
238 block->bufp, block->binbuf, block->buf_len, block->buf_len-block->binbuf,
240 Dmsg2(0, "Damaged block: buf=%x binbuffrombuf=%d \n",
241 block->buf, block->bufp-block->buf);
243 Emsg0(M_ABORT, 0, "Damaged buffer\n");
246 block->bufp += remlen;
247 block->binbuf += remlen;
248 rec->remainder -= remlen;
249 return 0; /* did partial transfer */
252 rec->remainder = 0; /* did whole transfer */
253 sm_check(__FILE__, __LINE__, False);
259 * Test if we can write whole record to the block
261 * Returns: 0 on failure
262 * 1 on success (all bytes can be written)
264 int can_write_record_to_block(DEV_BLOCK *block, DEV_RECORD *rec)
268 remlen = block->buf_len - block->binbuf;
269 if (rec->remainder == 0) {
270 if (remlen >= RECHDR_LENGTH) {
271 remlen -= RECHDR_LENGTH;
272 rec->remainder = rec->data_len;
279 if (rec->remainder > 0 && remlen < rec->remainder) {
287 * Read a Record from the block
288 * Returns: 0 if nothing read or if the continuation record does not match.
289 * In both of these cases, a block read must be done.
290 * 1 if at least the record header was read, this
291 * routine may have to be called again with a new
292 * block if the entire record was not read.
294 int read_record_from_block(DEV_BLOCK *block, DEV_RECORD *rec)
298 uint32_t VolSessionId;
299 uint32_t VolSessionTime;
304 remlen = block->binbuf;
306 /* Clear state flags */
310 * Get the header. There is always a full header,
311 * otherwise we find it in the next block.
313 if (remlen >= RECHDR_LENGTH) {
314 Dmsg3(90, "read_record_block: remlen=%d data_len=%d rem=%d\n",
315 remlen, rec->data_len, rec->remainder);
317 unser_begin(block->bufp, RECHDR_LENGTH);
318 unser_uint32(VolSessionId);
319 unser_uint32(VolSessionTime);
320 unser_int32(FileIndex);
322 unser_uint32(data_bytes);
324 ASSERT(unser_length(block->bufp) == RECHDR_LENGTH);
325 block->bufp += RECHDR_LENGTH;
326 block->binbuf -= RECHDR_LENGTH;
327 remlen -= RECHDR_LENGTH;
330 * if Stream is negative, it means that this is a continuation
331 * of a previous partially written record.
333 if (Stream < 0) { /* continuation record? */
334 Dmsg1(500, "Got negative Stream => continuation. remainder=%d\n",
336 rec->state |= REC_CONTINUATION;
337 if (!rec->remainder) { /* if we didn't read previously */
338 rec->data_len = 0; /* return data as if no continuation */
339 } else if (rec->VolSessionId != VolSessionId ||
340 rec->VolSessionTime != VolSessionTime ||
341 rec->Stream != -Stream) {
342 rec->state |= REC_NO_MATCH;
343 return 0; /* This is from some other Session */
345 rec->Stream = -Stream; /* set correct Stream */
346 } else { /* Regular record */
347 rec->Stream = Stream;
348 rec->data_len = 0; /* transfer to beginning of data */
350 rec->VolSessionId = VolSessionId;
351 rec->VolSessionTime = VolSessionTime;
352 rec->FileIndex = FileIndex;
354 Dmsg6(90, "rd_rec_blk() got FI=%s SessId=%d Strm=%s len=%d\n\
355 remlen=%d data_len=%d\n",
356 FI_to_ascii(rec->FileIndex), rec->VolSessionId,
357 stream_to_ascii(rec->Stream), data_bytes, remlen, rec->data_len);
360 * No more records in this block because the number
361 * of remaining bytes are less than a record header
362 * length, so return empty handed, but indicate that
363 * he must read again. By returning, we allow the
364 * higher level routine to fetch the next block and
367 Dmsg0(90, "read_record_block: nothing\n");
368 if (!rec->remainder) {
369 rec->remainder = 1; /* set to expect continuation */
370 rec->data_len = 0; /* no data transferred */
372 rec->state |= (REC_NO_HEADER | REC_BLOCK_EMPTY);
376 ASSERT(data_bytes < MAX_BLOCK_LENGTH); /* temp sanity check */
378 rec->data = check_pool_memory_size(rec->data, rec->data_len+data_bytes);
381 * At this point, we have read the header, now we
382 * must transfer as much of the data record as
383 * possible taking into account: 1. A partial
384 * data record may have previously been transferred,
385 * 2. The current block may not contain the whole data
388 if (remlen >= data_bytes) {
389 /* Got whole record */
390 memcpy(rec->data+rec->data_len, block->bufp, data_bytes);
391 block->bufp += data_bytes;
392 block->binbuf -= data_bytes;
393 rec->data_len += data_bytes;
396 memcpy(rec->data+rec->data_len, block->bufp, remlen);
397 block->bufp += remlen;
398 block->binbuf -= remlen;
399 rec->data_len += remlen;
400 rec->remainder = 1; /* partial record transferred */
401 Dmsg1(90, "read_record_block: partial xfered=%d\n", rec->data_len);
402 rec->state |= (REC_PARTIAL_RECORD | REC_BLOCK_EMPTY);
406 Dmsg4(90, "Rtn full rd_rec_blk FI=%s SessId=%d Strm=%s len=%d\n",
407 FI_to_ascii(rec->FileIndex), rec->VolSessionId,
408 stream_to_ascii(rec->Stream), rec->data_len);
409 return 1; /* transferred full record */