2 * Read code for Storage daemon
4 * Kern Sibbald, November MM
9 Copyright (C) 2000-2003 Kern Sibbald and John Walker
11 This program is free software; you can redistribute it and/or
12 modify it under the terms of the GNU General Public License as
13 published by the Free Software Foundation; either version 2 of
14 the License, or (at your option) any later version.
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 General Public License for more details.
21 You should have received a copy of the GNU General Public
22 License along with this program; if not, write to the Free
23 Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
31 /* Forward referenced subroutines */
32 static void get_session_record(DEVICE *dev, DEV_RECORD *rec, SESSION_LABEL *sessrec);
35 /* Responses sent to the File daemon */
36 static char OK_data[] = "3000 OK data\n";
37 static char rec_header[] = "rechdr %ld %ld %ld %ld %ld";
40 * Read Data and send to File Daemon
41 * Returns: 0 on failure
44 int do_read_data(JCR *jcr)
47 BSOCK *fd_sock = jcr->file_bsock;
54 SESSION_LABEL sessrec; /* session record */
55 uint32_t BlockNumber = 0;
57 Dmsg0(20, "Start read data.\n");
59 dev = jcr->device->dev;
60 memset(&sessrec, 0, sizeof(sessrec));
62 /* Tell File daemon we will send data */
63 bnet_fsend(fd_sock, OK_data);
64 Dmsg1(10, "bstored>filed: %s\n", fd_sock->msg);
68 if (!bnet_set_buffer_size(ds, MAX_NETWORK_BUFFER_SIZE, BNET_SETBUF_READ)) {
73 Dmsg1(20, "Begin read device=%s\n", dev_name(dev));
75 block = new_block(dev);
78 if (jcr->NumVolumes == 0) {
79 Jmsg(jcr, M_FATAL, 0, _("No Volume names found for restore.\n"));
85 Dmsg2(200, "Found %d volumes names to restore. First=%s\n", jcr->NumVolumes,
86 jcr->VolList->VolumeName);
88 pm_strcpy(&jcr->VolumeName, jcr->VolList->VolumeName);
91 * Ready device for reading, and read records
93 if (!acquire_device_for_read(jcr, dev, block)) {
100 free_pool_memory(rec->data);
101 rec->data = ds->msg; /* use socket message buffer */
102 hdr = get_pool_memory(PM_MESSAGE);
105 * Read records, apply BSR filtering, and return any that are
108 for ( ; ok && !done; ) {
109 if (job_canceled(jcr)) {
114 Dmsg1(500, "Main read_record. rem=%d\n", rec->remainder);
116 if (block_is_empty(block) && !read_block_from_device(jcr, dev, block, CHECK_BLOCK_NUMBERS)) {
117 Dmsg1(500, "Main read record failed. rem=%d\n", rec->remainder);
118 if (dev->state & ST_EOT) {
120 if (!mount_next_read_volume(jcr, dev, block)) {
123 /* Read and discard Volume Label */
124 record = new_record();
125 read_block_from_device(jcr, dev, block, NO_BLOCK_NUMBER_CHECK);
126 read_record_from_block(block, record);
127 get_session_record(dev, record, &sessrec);
129 /* Now, continue to read the records on this volume */
131 } else if (dev->state & ST_EOF) {
132 Dmsg0(90, "Got End of File. Trying again ...\n");
133 continue; /* End of File */
134 } else if (dev->state & ST_SHORT) {
137 /* I/O error -- or non-standard end of tape */
138 Dmsg0(000, "I/O error, bailing out.\n");
144 if (!block_is_empty(block) && !match_bsr_block(jcr->bsr, block)) {
145 Dmsg5(100, "reject Blk=%u blen=%u bVer=%d SessId=%u SessTim=%u\n",
146 block->BlockNumber, block->block_len, block->BlockVer,
147 block->VolSessionId, block->VolSessionTime);
148 empty_block(block); /* force read next block */
152 for (rec->state=0; !is_block_empty(rec); ) {
154 if (!read_record_from_block(block, rec)) {
158 * At this point, we have at least a record header.
159 * Now decide if we want this record or not, but remember
160 * before accessing the record, we may need to read again to
164 if (rec->FileIndex == EOM_LABEL) { /* end of tape? */
165 Dmsg0(40, "Get EOM LABEL\n");
167 break; /* yes, get out */
170 /* Some sort of label? */
171 if (rec->FileIndex < 0) {
172 get_session_record(dev, rec, &sessrec);
174 } /* end if label record */
177 /* Match BSR against current record */
179 int stat = match_bsr(jcr->bsr, rec, &dev->VolHdr, &sessrec);
180 if (stat == -1) { /* no more possible matches */
183 } else if (stat == 0) { /* no match */
184 Dmsg0(50, "BSR rejected record\n");
189 /* Old way, deprecated */
190 if (rec->VolSessionId != jcr->read_VolSessionId ||
191 rec->VolSessionTime != jcr->read_VolSessionTime) {
192 Dmsg0(50, "Ignore record ids not equal\n");
194 continue; /* ignore */
198 if (block->block_read) {
199 if (BlockNumber != block->BlockNumber) {
200 Jmsg(jcr, M_ERROR, 0, _("Invalid block number. Expected %u, got %u\n"),
201 BlockNumber, block->BlockNumber);
203 BlockNumber = block->BlockNumber + 1;
204 block->block_read = false;
207 if (is_partial_record(rec)) {
208 break; /* Go read full record */
212 * We "finally" have a full record here. Now
213 * generate Header parameters and send to File daemon
214 * Note, we build header in hdr buffer to avoid wiping
215 * out the data record
218 Dmsg5(400, "Send to FD: SessId=%u SessTim=%u FI=%d Strm=%d, len=%d\n",
219 rec->VolSessionId, rec->VolSessionTime, rec->FileIndex, rec->Stream,
221 if (!bnet_fsend(ds, rec_header, rec->VolSessionId, rec->VolSessionTime,
222 rec->FileIndex, rec->Stream, rec->data_len)) {
223 Dmsg1(30, ">filed: Error Hdr=%s\n", ds->msg);
226 Jmsg1(jcr, M_FATAL, 0, _("Error sending to File daemon. ERR=%s\n"),
231 Dmsg1(30, ">filed: Hdr=%s\n", ds->msg);
234 hdr = ds->msg; /* restore hdr buffer */
235 ds->msg = rec->data; /* restore data record address */
237 /* Send data record to File daemon */
238 ds->msglen = rec->data_len;
239 Dmsg1(40, ">filed: send %d bytes data.\n", ds->msglen);
240 if (!bnet_send(ds)) {
241 Pmsg1(000, "Error sending to FD. ERR=%s\n", bnet_strerror(ds));
242 Dmsg1(100, "Hdr=%s\n", hdr);
243 Dmsg1(100, "data=%s\n", ds->msg);
244 Jmsg1(jcr, M_FATAL, 0, _("Error sending to File daemon. ERR=%s\n"),
249 } /* end for loop reading records */
250 } /* end for loop reading blocks */
251 /* Send end of data to FD */
252 bnet_sig(ds, BNET_EOD);
254 if (!release_device(jcr, dev)) {
257 free_pool_memory(hdr);
259 rec->data = NULL; /* previously released */
262 Dmsg0(30, "Done reading.\n");
266 static void get_session_record(DEVICE *dev, DEV_RECORD *rec, SESSION_LABEL *sessrec)
269 memset(sessrec, 0, sizeof(sessrec));
270 switch (rec->FileIndex) {
272 rtype = "Fresh Volume Label";
275 rtype = "Volume Label";
276 unser_volume_label(dev, rec);
279 rtype = "Begin Session";
280 unser_session_label(sessrec, rec);
283 rtype = "End Session";
286 rtype = "End of Media";
292 Dmsg5(10, "%s Record: VolSessionId=%d VolSessionTime=%d JobId=%d DataLen=%d\n",
293 rtype, rec->VolSessionId, rec->VolSessionTime, rec->Stream, rec->data_len);