2 * Read code for Storage daemon
4 * Kern Sibbald, November MM
9 Copyright (C) 2000, 2001, 2002 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 */
33 /* Variables used by Child process */
34 /* Global statistics */
35 /* Note, these probably should be in shared memory so that
36 * they are truly global for all processes
38 extern struct s_shm *shm; /* shared memory structure */
39 extern int FiledDataChan; /* File daemon data channel (port) */
42 /* Responses sent to the File daemon */
43 static char OK_data[] = "3000 OK data\n";
44 static char rec_header[] = "rechdr %ld %ld %ld %ld %ld";
48 * Read Data and send to File Daemon
49 * Returns: 0 on failure
52 int do_read_data(JCR *jcr)
55 BSOCK *fd_sock = jcr->file_bsock;
61 SESSION_LABEL sessrec; /* session record */
63 Dmsg0(20, "Start read data.\n");
65 dev = jcr->device->dev;
66 memset(&sessrec, 0, sizeof(sessrec));
68 /* Tell File daemon we will send data */
69 bnet_fsend(fd_sock, OK_data);
70 Dmsg1(10, "bstored>filed: %s\n", fd_sock->msg);
74 if (!bnet_set_buffer_size(ds, MAX_NETWORK_BUFFER_SIZE, BNET_SETBUF_READ)) {
79 Dmsg1(20, "Begin read device=%s\n", dev_name(dev));
81 block = new_block(dev);
86 Dmsg1(20, "Found %d volumes names to restore.\n", jcr->NumVolumes);
89 * Ready device for reading, and read records
91 if (!acquire_device_for_read(jcr, dev, block)) {
98 free_pool_memory(rec->data);
99 rec->data = ds->msg; /* use socket message buffer */
100 hdr = get_pool_memory(PM_MESSAGE);
103 * Read records, apply BSR filtering, and return any that are
107 if (job_cancelled(jcr)) {
112 Dmsg1(500, "Main read_record. rem=%d\n", rec->remainder);
114 if (!read_block_from_device(dev, block)) {
115 Dmsg1(500, "Main read record failed. rem=%d\n", rec->remainder);
116 if (dev->state & ST_EOT) {
117 if (!mount_next_read_volume(jcr, dev, block)) {
122 if (dev->state & ST_EOF) {
123 Dmsg0(90, "Got End of File. Trying again ...\n");
124 continue; /* End of File */
126 if (dev->state & ST_SHORT) {
131 for (rec->state=0; !is_block_empty(rec); ) {
133 if (!read_record_from_block(block, rec)) {
137 * At this point, we have at least a record header.
138 * Now decide if we want this record or not, but remember
139 * before accessing the record, we may need to read again to
143 /* Some sort of label? */
144 if (rec->FileIndex < 0) {
146 memset(&sessrec, 0, sizeof(sessrec));
147 switch (rec->FileIndex) {
149 rtype = "Fresh Volume Label";
152 rtype = "Volume Label";
153 unser_volume_label(dev, rec);
156 rtype = "Begin Session";
157 unser_session_label(&sessrec, rec);
160 rtype = "End Session";
163 rtype = "End of Media";
169 Dmsg5(10, "%s Record: VolSessionId=%d VolSessionTime=%d JobId=%d DataLen=%d\n",
170 rtype, rec->VolSessionId, rec->VolSessionTime, rec->Stream, rec->data_len);
172 Dmsg1(40, "Got label = %d\n", rec->FileIndex);
173 if (rec->FileIndex == EOM_LABEL) { /* end of tape? */
174 Dmsg0(40, "Get EOM LABEL\n");
176 break; /* yes, get out */
179 continue; /* ignore other labels */
180 } /* end if label record */
182 /* Match BSR against current record */
184 if (!match_bsr(jcr->bsr, rec, &dev->VolHdr, &sessrec)) {
185 Dmsg0(50, "BSR rejected record\n");
190 /* Old way, deprecated */
191 if (rec->VolSessionId != jcr->read_VolSessionId ||
192 rec->VolSessionTime != jcr->read_VolSessionTime) {
193 Dmsg0(50, "Ignore record ids not equal\n");
195 continue; /* ignore */
199 if (is_partial_record(rec)) {
200 break; /* Go read full record */
203 /* Generate Header parameters and send to File daemon
204 * Note, we build header in hdr buffer to avoid wiping
205 * out the data record
208 if (!bnet_fsend(ds, rec_header, rec->VolSessionId, rec->VolSessionTime,
209 rec->FileIndex, rec->Stream, rec->data_len)) {
210 Dmsg1(30, ">filed: Error Hdr=%s\n", ds->msg);
216 Dmsg1(30, ">filed: Hdr=%s\n", ds->msg);
219 hdr = ds->msg; /* restore hdr buffer */
220 ds->msg = rec->data; /* restore data record address */
222 /* Send data record to File daemon */
223 ds->msglen = rec->data_len;
224 Dmsg1(40, ">filed: send %d bytes data.\n", ds->msglen);
225 if (!bnet_send(ds)) {
226 Dmsg0(0, "Error sending to FD\n");
227 Jmsg1(jcr, M_FATAL, 0, _("Error sending to File daemon. ERR=%s\n"),
233 /* Send end of data to FD */
234 bnet_sig(ds, BNET_EOD);
236 if (!release_device(jcr, dev, block)) {
239 free_pool_memory(hdr);
241 rec->data = NULL; /* previously released */
244 Dmsg0(30, "Done reading.\n");