Disabled but did not discarded failed attempt to lock against growisofs
This commit is contained in:
parent
927352c609
commit
886b8d1f81
@ -1359,7 +1359,7 @@ int Cdrpreskin_queue_msgs(struct CdrpreskiN *o, int flag)
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if(o->verbosity>=Cdrskin_verbose_debuG)
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Cdrpreskin_set_severities(o,"DEBUG","NEVER",0);
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else
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Cdrpreskin_set_severities(o,"NOTE","NEVER",0);
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Cdrpreskin_set_severities(o,"SORRY","NEVER",0);
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queueing= 1;
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return(1);
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}
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@ -1 +1 @@
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#define Cdrskin_timestamP "2006.09.27.082057"
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#define Cdrskin_timestamP "2006.09.27.115919"
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@ -37,7 +37,7 @@ void burn_drive_free(struct burn_drive *d)
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return;
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/* ts A60822 : close open fds before forgetting them */
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if (burn_drive_is_open(d))
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sg_close_drive_fd(d->devname, d->global_index, &(d->fd), 0);
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sg_close_drive(d);
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free((void *) d->idata);
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free((void *) d->mdata);
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free((void *) d->toc_entry);
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@ -248,6 +248,18 @@ struct burn_drive *burn_drive_register(struct burn_drive *d)
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}
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/* unregister most recently registered drive */
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int burn_drive_unregister(struct burn_drive *d)
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{
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if(d->global_index != drivetop)
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return 0;
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burn_drive_free(d);
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drivetop--;
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return 1;
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}
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void burn_drive_release(struct burn_drive *d, int le)
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{
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if (d->released)
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@ -711,7 +723,6 @@ int burn_drive_is_enumerable_adr(char *adr)
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return sg_is_enumerable_adr(adr);
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}
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/* ts A60922 ticket 33 */
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/* Try to find an enumerated address with the given stat.st_rdev number */
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int burn_drive_resolve_link(char *path, char adr[])
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@ -292,7 +292,10 @@ Range "scdbackup" : 0x00020000 to 0x0002ffff
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0x00020001 (SORRY,LOW) = Cannot open busy device
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0x00020002 (SORRY,HIGH) = Encountered error when closing drive
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0x00020003 (FATAL,HIGH) = Could not grab drive
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0x00020004 (NOTE,HIGH) = Opened O_EXCL scsi sibling
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0x00020005 (FATAL,HIGH) = Failed to open device
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0x00020006 (FATAL,HIGH) = Too many scsi siblings
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0x00020007 (NOTE,HIGH) = Closed O_EXCL scsi siblings
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------------------------------------------------------------------------------
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249
libburn/sg.c
249
libburn/sg.c
@ -89,6 +89,28 @@ int sg_close_drive_fd(char *fname, int driveno, int *fd, int sorry)
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}
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/* ts A60924 */
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int sg_handle_busy_device(char *fname, int os_errno)
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{
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char msg[4096];
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/* ts A60814 : i saw no way to do this more nicely */
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if (burn_sg_open_abort_busy) {
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fprintf(stderr,
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"\nlibburn: FATAL : Application triggered abort on busy device '%s'\n",
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fname);
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assert("drive busy" == "non fatal");
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}
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/* ts A60924 : now reporting to libdax_msgs */
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sprintf(msg, "Cannot open busy device '%s'", fname);
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libdax_msgs_submit(libdax_messenger, -1, 0x00020001,
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LIBDAX_MSGS_SEV_SORRY, LIBDAX_MSGS_PRIO_LOW,
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msg, os_errno, 0);
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return 1;
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}
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/* ts A60922 ticket 33 */
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/** Returns the next index number and the next enumerated drive address.
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@param idx An opaque number handle. Make no own theories about it.
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@ -146,33 +168,155 @@ int sg_is_enumerable_adr(char *adr)
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}
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/* ts A60924 */
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int sg_handle_busy_device(char *fname, int os_errno)
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/* ts A60926 */
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int sg_release_siblings(int sibling_fds[], int *sibling_count)
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{
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char msg[4096];
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int i;
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char msg[81];
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/* ts A60814 : i saw no way to do this more nicely */
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if (burn_sg_open_abort_busy) {
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fprintf(stderr,
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"\nlibburn: FATAL : Application triggered abort on busy device '%s'\n",
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fname);
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assert("drive busy" == "non fatal");
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for(i= 0; i < *sibling_count; i++)
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sg_close_drive_fd(NULL, -1, &(sibling_fds[i]), 0);
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if(*sibling_count > 0) {
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sprintf(msg, "Closed %d O_EXCL scsi siblings", *sibling_count);
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libdax_msgs_submit(libdax_messenger, -1, 0x00020007,
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LIBDAX_MSGS_SEV_NOTE, LIBDAX_MSGS_PRIO_HIGH, msg, 0,0);
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}
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/* ts A60924 : now reporting to libdax_msgs */
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sprintf(msg, "Cannot open busy device '%s'", fname);
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libdax_msgs_submit(libdax_messenger, -1, 0x00020001,
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LIBDAX_MSGS_SEV_SORRY, LIBDAX_MSGS_PRIO_LOW,
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msg, os_errno, 0);
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*sibling_count = 0;
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return 1;
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}
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/* ts A60926 */
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int sg_open_drive_fd(char *fname, int scan_mode)
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{
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int open_mode = O_RDWR, fd;
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char msg[81];
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/* ts A60813
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O_EXCL with block devices is an unpublished feature
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of Linux kernels. Possibly introduced 2002.
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Mentioned in "The Linux SCSI Generic (sg) HOWTO" */
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if(burn_sg_open_o_excl)
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open_mode |= O_EXCL;
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/* ts A60813
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O_NONBLOCK was already hardcoded in ata_ but not in sg_.
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There must be some reason for this. So O_NONBLOCK is
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default mode for both now. Disable on own risk. */
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if(burn_sg_open_o_nonblock)
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open_mode |= O_NONBLOCK;
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/* <<< debugging
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fprintf(stderr,
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"\nlibburn: experimental: o_excl= %d , o_nonblock= %d, abort_on_busy= %d\n",
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burn_sg_open_o_excl,burn_sg_open_o_nonblock,burn_sg_open_abort_busy);
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fprintf(stderr,
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"libburn: experimental: O_EXCL= %d , O_NONBLOCK= %d\n",
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!!(open_mode&O_EXCL),!!(open_mode&O_NONBLOCK));
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*/
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fd = open(fname, open_mode);
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if (fd == -1) {
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/* <<< debugging
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fprintf(stderr,
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"\nlibburn: experimental: fname= %s , errno= %d\n",
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fname,errno);
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*/
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if (errno == EBUSY) {
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sg_handle_busy_device(fname, errno);
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return -1;
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}
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if (scan_mode)
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return -1;
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sprintf(msg, "Failed to open device '%s'",fname);
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libdax_msgs_submit(libdax_messenger, -1, 0x00020005,
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LIBDAX_MSGS_SEV_FATAL, LIBDAX_MSGS_PRIO_HIGH,
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msg, errno, 0);
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return -1;
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}
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return fd;
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}
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/* ts A60926 */
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int sg_open_scsi_siblings(char *path, int driveno,
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int sibling_fds[], int *sibling_count,
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int host_no, int channel_no, int id_no, int lun_no)
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{
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int tld, i, ret, fd;
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int i_host_no = -1, i_channel_no = -1, i_target_no = -1, i_lun_no = -1;
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char msg[161], fname[81];
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static char tldev[][81]= {"/dev/sr%d", "/dev/scd%d", "/dev/st%d", ""};
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if(host_no < 0 || id_no < 0 || channel_no < 0 || lun_no < 0)
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return(2);
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if(*sibling_count > 0)
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sg_release_siblings(sibling_fds, sibling_count);
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for (tld = 0; tldev[tld][0] != 0; tld++) {
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for (i = 0; i < 32; i++) {
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sprintf(fname, tldev[tld], i);
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ret = sg_obtain_scsi_adr(fname, &i_host_no,
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&i_channel_no, &i_target_no, &i_lun_no);
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if (ret <= 0)
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continue;
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if (i_host_no != host_no || i_channel_no != channel_no)
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continue;
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if (i_target_no != id_no || i_lun_no != lun_no)
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continue;
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fd = sg_open_drive_fd(fname, 0);
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if (fd < 0)
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goto failed;
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if (*sibling_count>=LIBBURN_SG_MAX_SIBLINGS) {
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sprintf(msg, "Too many scsi siblings of '%s'",
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path);
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libdax_msgs_submit(libdax_messenger,
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driveno, 0x00020006,
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LIBDAX_MSGS_SEV_FATAL,
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LIBDAX_MSGS_PRIO_HIGH, msg, 0, 0);
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goto failed;
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}
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sprintf(msg, "Opened O_EXCL scsi sibling '%s' of '%s'",
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fname, path);
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libdax_msgs_submit(libdax_messenger, driveno,
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0x00020004,
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LIBDAX_MSGS_SEV_NOTE, LIBDAX_MSGS_PRIO_HIGH,
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msg, 0, 0);
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sibling_fds[*sibling_count] = fd;
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(*sibling_count)++;
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}
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}
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return(1);
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failed:;
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sg_release_siblings(sibling_fds, sibling_count);
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return 0;
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}
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/* ts A60926 */
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int sg_close_drive(struct burn_drive *d)
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{
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int ret;
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if (!burn_drive_is_open(d))
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return 0;
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sg_release_siblings(d->sibling_fds, &(d->sibling_count));
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ret = sg_close_drive_fd(d->devname, d->global_index, &(d->fd), 0);
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return ret;
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}
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void ata_enumerate(void)
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{
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struct hd_driveid tm;
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int i, fd;
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char fname[10];
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#ifdef No_sg_open_drive_fD
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/* ts A60813 */
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int open_mode = O_RDWR;
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@ -189,6 +333,9 @@ void ata_enumerate(void)
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if(burn_sg_open_o_nonblock)
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open_mode |= O_NONBLOCK;
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#endif /* No_sg_open_drive_fD */
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for (i = 0; i < 26; i++) {
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sprintf(fname, "/dev/hd%c", 'a' + i);
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/* open O_RDWR so we don't think read only drives are
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@ -197,6 +344,8 @@ void ata_enumerate(void)
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/* ts A51221 */
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if (burn_drive_is_banned(fname))
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continue;
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#ifdef No_sg_open_drive_fD
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fd = open(fname, open_mode);
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if (fd == -1) {
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/* <<< debugging
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@ -208,6 +357,12 @@ void ata_enumerate(void)
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sg_handle_busy_device(fname, errno);
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continue;
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}
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#else
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fd = sg_open_drive_fd(fname, 1);
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if (fd == -1)
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continue;
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#endif /* ! No_sg_open_drive_fD */
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/* found a drive */
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ioctl(fd, HDIO_GET_IDENTITY, &tm);
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@ -232,9 +387,12 @@ void ata_enumerate(void)
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void sg_enumerate(void)
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{
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struct sg_scsi_id sid;
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int i, fd;
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int i, fd, sibling_fds[LIBBURN_SG_MAX_SIBLINGS], sibling_count= 0, ret;
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char fname[10];
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#ifdef No_sg_open_drive_fD
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/* ts A60813 */
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int open_mode = O_RDWR;
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@ -261,6 +419,9 @@ void sg_enumerate(void)
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*/
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#endif /* No_sg_open_drive_fD */
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for (i = 0; i < 32; i++) {
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sprintf(fname, "/dev/sg%d", i);
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/* open RDWR so we don't accidentally think read only drives
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@ -269,6 +430,9 @@ void sg_enumerate(void)
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/* ts A51221 */
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if (burn_drive_is_banned(fname))
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continue;
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#ifdef No_sg_open_drive_fD
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fd = open(fname, open_mode);
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if (fd == -1) {
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@ -281,6 +445,14 @@ void sg_enumerate(void)
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sg_handle_busy_device(fname, errno);
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continue;
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}
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#else
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fd = sg_open_drive_fd(fname, 1);
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if (fd == -1)
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continue;
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#endif /* ! No_sg_open_drive_fD */
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/* found a drive */
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ioctl(fd, SG_GET_SCSI_ID, &sid);
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if (sg_close_drive_fd(fname, -1, &fd,
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@ -288,6 +460,21 @@ void sg_enumerate(void)
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continue;
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if (sid.scsi_type != TYPE_ROM)
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continue;
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/* ts A60927 : trying to do locking with growisofs */
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if(burn_sg_open_o_excl>1) {
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ret = sg_open_scsi_siblings(
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fname, -1, sibling_fds, &sibling_count,
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sid.host_no, sid.channel,
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sid.scsi_id, sid.lun);
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if (ret<=0) {
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sg_handle_busy_device(fname, 0);
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continue;
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}
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/* the final occupation will be done in sg_grab() */
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sg_release_siblings(sibling_fds, &sibling_count);
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}
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enumerate_common(fname, sid.host_no, sid.channel,
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sid.scsi_id, sid.lun);
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}
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@ -296,6 +483,7 @@ void sg_enumerate(void)
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static void enumerate_common(char *fname, int host_no, int channel_no,
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int target_no, int lun_no)
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{
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int i;
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struct burn_drive *t;
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struct burn_drive out;
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@ -307,6 +495,9 @@ static void enumerate_common(char *fname, int host_no, int channel_no,
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out.devname = burn_strdup(fname);
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out.fd = -1337;
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out.sibling_count = 0;
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for(i= 0; i<LIBBURN_SG_MAX_SIBLINGS; i++)
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out.sibling_fds[i] = -1337;
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out.grab = sg_grab;
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out.release = sg_release;
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@ -355,6 +546,7 @@ static void enumerate_common(char *fname, int host_no, int channel_no,
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t->released = 1;
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} else {
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burn_print(2, "unable to grab new located drive\n");
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burn_drive_unregister(t);
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}
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/* ts A60821
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@ -373,7 +565,7 @@ static void enumerate_common(char *fname, int host_no, int channel_no,
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*/
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int sg_grab(struct burn_drive *d)
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{
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int fd, count, os_errno= 0;
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int fd, count, os_errno= 0, ret;
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/* ts A60813 */
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int open_mode = O_RDWR;
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@ -409,6 +601,17 @@ int sg_grab(struct burn_drive *d)
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<<< debug: for tracing calls which might use open drive fds */
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mmc_function_spy("sg_grab ----------- opening");
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/* ts A60926 */
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if(burn_sg_open_o_excl>1) {
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fd = -1;
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ret = sg_open_scsi_siblings(d->devname,
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d->global_index,d->sibling_fds,
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&(d->sibling_count),
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d->host, d->channel, d->id, d->lun);
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if(ret <= 0)
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goto drive_is_in_use;
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}
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fd = open(d->devname, open_mode);
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os_errno = errno;
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} else
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@ -420,19 +623,27 @@ int sg_grab(struct burn_drive *d)
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/* ts A60814:
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according to my experiments this test would work now ! */
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/* ts A60926 : this was disabled */
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/* Tests with growisofs on kernel 2.4.21 yielded that this
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does not help against blocking on busy drives.
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*/
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/* <<< the old dummy */
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/* er = ioctl(fd, SG_GET_ACCESS_COUNT, &count);*/
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count = 1;
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if (1 == count) {
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d->fd = fd;
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fcntl(fd, F_SETOWN, getpid());
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d->released = 0;
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return 1;
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}
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drive_is_in_use:;
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libdax_msgs_submit(libdax_messenger, d->global_index,
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0x00020003,
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LIBDAX_MSGS_SEV_FATAL, LIBDAX_MSGS_PRIO_HIGH,
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"Could not grab drive - already in use", 0, 0);
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sg_close_drive_fd(d->devname, d->global_index, &fd, 0);
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sg_close_drive(d);
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d->fd = -1337;
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return 0;
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}
|
||||
@ -462,7 +673,7 @@ int sg_release(struct burn_drive *d)
|
||||
<<< debug: for tracing calls which might use open drive fds */
|
||||
mmc_function_spy("sg_release ----------- closing");
|
||||
|
||||
sg_close_drive_fd(d->devname, d->global_index, &(d->fd), 0);
|
||||
sg_close_drive(d);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
@ -18,6 +18,13 @@ int sg_is_enumerable_adr(char *adr);
|
||||
int sg_obtain_scsi_adr(char *path, int *host_no, int *channel_no,
|
||||
int *target_no, int *lun_no);
|
||||
|
||||
/* ts A60926 : ticket 33 ++ */
|
||||
int sg_open_scsi_siblings(char *fname, int driveno,
|
||||
int sibling_fds[], int *sibling_count,
|
||||
int host_no, int channel_no, int id_no, int lun_no);
|
||||
int sg_release_siblings(int sibling_fds[], int *sibling_count);
|
||||
int sg_close_drive(struct burn_drive *d);
|
||||
|
||||
void sg_enumerate(void);
|
||||
void ata_enumerate(void);
|
||||
int sg_grab(struct burn_drive *);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user