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- patch from bochs@sigint.cs.purdue.edu to avoid using BLKGETSIZE which

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does not apply to SCSI
This commit is contained in:
Bryce Denney 2001-06-25 18:06:11 +00:00
parent 7bbb3521db
commit ce59ee3f00
1 changed files with 106 additions and 0 deletions
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@ -0,0 +1,106 @@
----------------------------------------------------------------------
Patch name: patch.cdrom-blkgetsize
Author: bochs@sigint.cs.purdue.edu
Date: Fri, 22 Jun 2001 10:46:07 -0500
Detailed description:
The original code for determining the capacity of a disc only worked for
ATAPI drives, leaving us poor SCSI users in the cold. The code uses the
standard Linux CD-ROM driver routines, so it should work on any supported
drive. It's basically just a copy of Keith Jones FreeBSD code.
Patch was created with:
?
Apply patch to what version:
?
Instructions:
?
----------------------------------------------------------------------
--- iodev/cdrom.cc.orig Tue Jun 19 16:36:09 2001
+++ iodev/cdrom.cc Fri Jun 22 10:40:07 2001
@@ -390,24 +390,6 @@
return(buf.st_size);
}
-#elif __linux__
- {
- // I just looked through the Linux kernel source to see
- // what it does with the ATAPI capacity command, and reversed
- // that process here.
- uint32 nr_sects;
-
- if (fd < 0) {
- BX_PANIC(("cdrom: capacity: file not open."));
- }
- if (ioctl(fd, BLKGETSIZE, &nr_sects) != 0) {
- BX_PANIC(("cdrom: ioctl(BLKGETSIZE) failed"));
- }
- nr_sects /= (CD_FRAMESIZE / 512);
-
- BX_DEBUG(( "capacity: %u", nr_sects));
- return(nr_sects);
- }
#elif defined(__OpenBSD__)
{
// We just read the disklabel, imagine that...
@@ -421,6 +403,57 @@
BX_DEBUG(( "capacity: %u", lp.d_secperunit ));
return(lp.d_secperunit);
+ }
+#elif defined(__linux__)
+ {
+ // Read the TOC to get the data size, since BLKGETSIZE doesn't work on
+ // non-ATAPI drives. This is based on Keith Jones code below.
+ // <splite@purdue.edu> 21 June 2001
+
+ int i, dtrk, dtrk_lba, num_sectors;
+ struct cdrom_tochdr td;
+ struct cdrom_tocentry te;
+
+ if (fd < 0)
+ BX_PANIC(("cdrom: capacity: file not open."));
+
+ if (ioctl(fd, CDROMREADTOCHDR, &td) < 0)
+ BX_PANIC(("cdrom: ioctl(CDROMREADTOCHDR) failed"));
+
+ num_sectors = -1;
+ dtrk_lba = -1;
+
+ for (i = td.cdth_trk0; i <= td.cdth_trk1; i++) {
+ te.cdte_track = i;
+ te.cdte_format = CDROM_LBA;
+ if (ioctl(fd, CDROMREADTOCENTRY, &te) < 0)
+ BX_PANIC(("cdrom: ioctl(CDROMREADTOCENTRY) failed"));
+
+ if (dtrk_lba != -1) {
+ num_sectors = te.cdte_addr.lba - dtrk_lba;
+ break;
+ }
+ if (te.cdte_ctrl & CDROM_DATA_TRACK) {
+ dtrk = i;
+ dtrk_lba = te.cdte_addr.lba;
+ }
+ }
+
+ if (num_sectors < 0) {
+ if (dtrk_lba != -1) {
+ te.cdte_track = CDROM_LEADOUT;
+ te.cdte_format = CDROM_LBA;
+ if (ioctl(fd, CDROMREADTOCENTRY, &te) < 0)
+ BX_PANIC(("cdrom: ioctl(CDROMREADTOCENTRY) failed"));
+ num_sectors = te.cdte_addr.lba - dtrk_lba;
+ } else
+ BX_PANIC(("cdrom: no data track found"));
+ }
+
+ BX_INFO(("cdrom: Data track %d, length %d", dtrk, num_sectors));
+
+ return(num_sectors);
+
}
#elif defined(__FreeBSD__)
{