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 */
32 static void get_session_record(DEVICE *dev, DEV_RECORD *rec, SESSION_LABEL *sessrec);
34 /* Variables used by Child process */
35 /* Global statistics */
36 /* Note, these probably should be in shared memory so that
37 * they are truly global for all processes
39 extern struct s_shm *shm; /* shared memory structure */
40 extern int FiledDataChan; /* File daemon data channel (port) */
43 /* Responses sent to the File daemon */
44 static char OK_data[] = "3000 OK data\n";
45 static char rec_header[] = "rechdr %ld %ld %ld %ld %ld";
49 * Read Data and send to File Daemon
50 * Returns: 0 on failure
53 int do_read_data(JCR *jcr)
56 BSOCK *fd_sock = jcr->file_bsock;
62 SESSION_LABEL sessrec; /* session record */
64 Dmsg0(20, "Start read data.\n");
66 dev = jcr->device->dev;
67 memset(&sessrec, 0, sizeof(sessrec));
69 /* Tell File daemon we will send data */
70 bnet_fsend(fd_sock, OK_data);
71 Dmsg1(10, "bstored>filed: %s\n", fd_sock->msg);
75 if (!bnet_set_buffer_size(ds, MAX_NETWORK_BUFFER_SIZE, BNET_SETBUF_READ)) {
80 Dmsg1(20, "Begin read device=%s\n", dev_name(dev));
82 block = new_block(dev);
85 if (jcr->NumVolumes == 0) {
86 Jmsg(jcr, M_FATAL, 0, _("No Volume names found for restore.\n"));
92 Dmsg2(200, "Found %d volumes names to restore. First=%s\n", jcr->NumVolumes,
93 jcr->VolList->VolumeName);
95 pm_strcpy(&jcr->VolumeName, jcr->VolList->VolumeName);
98 * Ready device for reading, and read records
100 if (!acquire_device_for_read(jcr, dev, block)) {
107 free_pool_memory(rec->data);
108 rec->data = ds->msg; /* use socket message buffer */
109 hdr = get_pool_memory(PM_MESSAGE);
112 * Read records, apply BSR filtering, and return any that are
116 if (job_cancelled(jcr)) {
121 Dmsg1(500, "Main read_record. rem=%d\n", rec->remainder);
123 if (!read_block_from_device(dev, block)) {
124 Dmsg1(500, "Main read record failed. rem=%d\n", rec->remainder);
125 if (dev->state & ST_EOT) {
127 if (!mount_next_read_volume(jcr, dev, block)) {
130 record = new_record();
131 read_block_from_device(dev, block);
132 read_record_from_block(block, record);
133 get_session_record(dev, record, &sessrec);
136 if (dev->state & ST_EOF) {
137 Dmsg0(90, "Got End of File. Trying again ...\n");
138 continue; /* End of File */
140 if (dev->state & ST_SHORT) {
145 for (rec->state=0; !is_block_empty(rec); ) {
147 if (!read_record_from_block(block, rec)) {
151 * At this point, we have at least a record header.
152 * Now decide if we want this record or not, but remember
153 * before accessing the record, we may need to read again to
157 if (rec->FileIndex == EOM_LABEL) { /* end of tape? */
158 Dmsg0(40, "Get EOM LABEL\n");
160 break; /* yes, get out */
163 /* Some sort of label? */
164 if (rec->FileIndex < 0) {
165 get_session_record(dev, rec, &sessrec);
167 } /* end if label record */
170 /* Match BSR against current record */
172 int stat = match_bsr(jcr->bsr, rec, &dev->VolHdr, &sessrec);
173 if (stat == -1) { /* no more possible matches */
176 } else if (stat == 0) { /* no match */
177 Dmsg0(50, "BSR rejected record\n");
182 /* Old way, deprecated */
183 if (rec->VolSessionId != jcr->read_VolSessionId ||
184 rec->VolSessionTime != jcr->read_VolSessionTime) {
185 Dmsg0(50, "Ignore record ids not equal\n");
187 continue; /* ignore */
191 if (is_partial_record(rec)) {
192 break; /* Go read full record */
195 /* Generate Header parameters and send to File daemon
196 * Note, we build header in hdr buffer to avoid wiping
197 * out the data record
200 if (!bnet_fsend(ds, rec_header, rec->VolSessionId, rec->VolSessionTime,
201 rec->FileIndex, rec->Stream, rec->data_len)) {
202 Dmsg1(30, ">filed: Error Hdr=%s\n", ds->msg);
208 Dmsg1(30, ">filed: Hdr=%s\n", ds->msg);
211 hdr = ds->msg; /* restore hdr buffer */
212 ds->msg = rec->data; /* restore data record address */
214 /* Send data record to File daemon */
215 ds->msglen = rec->data_len;
216 Dmsg1(40, ">filed: send %d bytes data.\n", ds->msglen);
217 if (!bnet_send(ds)) {
218 Pmsg1(000, "Error sending to FD. ERR=%s\n", bnet_strerror(ds));
219 Dmsg1(100, "Hdr=%s\n", hdr);
220 Dmsg1(100, "data=%s\n", ds->msg);
221 Jmsg1(jcr, M_FATAL, 0, _("Error sending to File daemon. ERR=%s\n"),
228 /* Send end of data to FD */
229 bnet_sig(ds, BNET_EOD);
231 if (!release_device(jcr, dev)) {
234 free_pool_memory(hdr);
236 rec->data = NULL; /* previously released */
239 Dmsg0(30, "Done reading.\n");
243 static void get_session_record(DEVICE *dev, DEV_RECORD *rec, SESSION_LABEL *sessrec)
246 memset(sessrec, 0, sizeof(sessrec));
247 switch (rec->FileIndex) {
249 rtype = "Fresh Volume Label";
252 rtype = "Volume Label";
253 unser_volume_label(dev, rec);
256 rtype = "Begin Session";
257 unser_session_label(sessrec, rec);
260 rtype = "End Session";
263 rtype = "End of Media";
269 Dmsg5(10, "%s Record: VolSessionId=%d VolSessionTime=%d JobId=%d DataLen=%d\n",
270 rtype, rec->VolSessionId, rec->VolSessionTime, rec->Stream, rec->data_len);