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@ -1,4 +1,4 @@ |
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$OpenBSD: INSTALL.linux,v 1.4 1998/09/25 01:58:38 espie Exp $ |
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$OpenBSD: INSTALL.linux,v 1.5 1999/01/09 17:18:20 espie Exp $ |
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Warning: this document is currently being reviewed. It's not yet complete, |
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and probably contains loads of errors. As an example, I can't figure out |
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@ -398,179 +398,11 @@ rerun lilo, and voila, OpenBSD was able to boot ! |
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Linux and OpenBSD partitions |
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---------------------------- |
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As of 2.0.35/2.1.122, Linux does not support OpenBSD partitions. The way |
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the Linux kernel works is reasonably straightforward (code in |
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drivers/block/genhd.c): when detecting a BSD partition (type A5), |
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it checks and parses the first block for a disklabel, and use that |
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information to instantiate some new partitions, |
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that will show up in that drive's partition list, exactly like extended |
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partitions do show up. Unfortunately, that check is hard coded for a type A5 |
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(NetBSD/FreeBSD) partition, and it recognizes 8 partitions disklabels only |
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anyway. |
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Just hacking the Linux code to recognize A6 is not quite enough. You also |
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need to trim down the resulting list of partitions, as your ext2fs |
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partitions will now show up twice ! |
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I'm experimenting with the following patch, which should make it to linux-kernel |
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soon: |
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-------------------------------------------------------------- |
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diff -ur linux.orig/drivers/block/genhd.c linux/drivers/block/genhd.c |
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--- linux.orig/drivers/block/genhd.c Mon Aug 4 20:45:35 1997 |
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+++ linux/drivers/block/genhd.c Thu Sep 24 18:55:31 1998 |
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@@ -205,11 +206,46 @@ |
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} |
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#ifdef CONFIG_BSD_DISKLABEL |
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+static void check_and_add_bsd_partition(struct gendisk *hd, struct bsd_partition *bsd_p) |
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+{ |
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+ struct hd_struct *lin_p; |
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+ /* check relative position of partitions. */ |
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+ for (lin_p = hd->part + 1; lin_p - hd->part < current_minor; lin_p++) { |
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+ /* no relationship -> try again */ |
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+ if (lin_p->start_sect + lin_p->nr_sects <= bsd_p->p_offset |
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+ || lin_p->start_sect >= bsd_p->p_offset + bsd_p->p_size) |
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+ continue; |
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+ /* equal -> no need to add */ |
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+ if (lin_p->start_sect == bsd_p->p_offset && |
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+ lin_p->nr_sects == bsd_p->p_size) |
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+ return; |
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+ /* bsd living within dos partition */ |
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+ if (lin_p->start_sect <= bsd_p->p_offset && lin_p->start_sect |
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+ + lin_p->nr_sects >= bsd_p->p_offset + bsd_p->p_size) { |
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+#ifdef DEBUG_BSD_DISKLABEL |
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+ printk("w: %d %ld+%ld,%d+%d", |
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+ lin_p - hd->part, lin_p->start_sect, lin_p->nr_sects, |
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+ bsd_p->p_offset, bsd_p->p_size); |
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+#endif |
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+ break; |
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+ } |
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+ /* ouch: bsd and linux overlap. Don't even try for that partition */ |
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+#ifdef DEBUG_BSD_DISKLABEL |
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+ printk("???: %d %ld+%ld,%d+%d", |
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+ lin_p - hd->part, lin_p->start_sect, lin_p->nr_sects, |
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+ bsd_p->p_offset, bsd_p->p_size); |
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+#endif |
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+ printk("???"); |
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+ return; |
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+ } /* if the bsd partition is not described by DOS, we end up there */ |
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+ add_partition(hd, current_minor, bsd_p->p_offset, bsd_p->p_size); |
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+ current_minor++; |
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+} |
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/* |
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* Create devices for BSD partitions listed in a disklabel, under a |
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* dos-like partition. See extended_partition() for more information. |
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*/ |
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-static void bsd_disklabel_partition(struct gendisk *hd, kdev_t dev) |
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+static void bsd_disklabel_partition(struct gendisk *hd, kdev_t dev, int max_partitions) |
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{ |
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struct buffer_head *bh; |
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struct bsd_disklabel *l; |
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@@ -225,19 +261,15 @@ |
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return; |
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} |
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- p = &l->d_partitions[0]; |
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- while (p - &l->d_partitions[0] <= BSD_MAXPARTITIONS) { |
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+ if (l->d_npartitions < max_partitions) |
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+ max_partitions = l->d_npartitions; |
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+ for (p = l->d_partitions; p - l->d_partitions < max_partitions; p++) { |
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if ((current_minor & mask) >= (4 + hd->max_p)) |
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break; |
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- |
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- if (p->p_fstype != BSD_FS_UNUSED) { |
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- add_partition(hd, current_minor, p->p_offset, p->p_size); |
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- current_minor++; |
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- } |
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- p++; |
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+ if (p->p_fstype != BSD_FS_UNUSED) |
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+ check_and_add_bsd_partition(hd, p); |
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} |
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brelse(bh); |
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- |
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} |
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#endif |
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@@ -248,6 +280,11 @@ |
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struct partition *p; |
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unsigned char *data; |
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int mask = (1 << hd->minor_shift) - 1; |
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+#ifdef CONFIG_BSD_DISKLABEL |
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+ /* no bsd disklabel as a default */ |
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+ kdev_t bsd_kdev = 0; |
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+ int bsd_maxpart; |
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+#endif |
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#ifdef CONFIG_BLK_DEV_IDE |
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int tested_for_xlate = 0; |
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@@ -365,13 +402,29 @@ |
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hd->part[minor].nr_sects = 2; |
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} |
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#ifdef CONFIG_BSD_DISKLABEL |
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+ /* tag first disklabel for late recognition */ |
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if (SYS_IND(p) == BSD_PARTITION) { |
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- printk(" <"); |
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- bsd_disklabel_partition(hd, MKDEV(hd->major, minor)); |
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- printk(" >"); |
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+ printk("!"); |
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+ if (!bsd_kdev) { |
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+ bsd_kdev = MKDEV(hd->major, minor); |
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+ bsd_maxpart = BSD_MAXPARTITIONS; |
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+ } |
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+ } else if (SYS_IND(p) == OPENBSD_PARTITION) { |
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+ printk("!"); |
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+ if (!bsd_kdev) { |
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+ bsd_kdev = MKDEV(hd->major, minor); |
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+ bsd_maxpart = OPENBSD_MAXPARTITIONS; |
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+ } |
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} |
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#endif |
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} |
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+#ifdef CONFIG_BSD_DISKLABEL |
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+ if (bsd_kdev) { |
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+ printk(" <"); |
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+ bsd_disklabel_partition(hd, bsd_kdev, bsd_maxpart); |
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+ printk(" >"); |
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+ } |
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+#endif |
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/* |
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* Check for old-style Disk Manager partition table |
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*/ |
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diff -ur linux.orig/include/linux/genhd.h linux/include/linux/genhd.h |
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--- linux.orig/include/linux/genhd.h Wed Mar 18 20:25:30 1998 |
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+++ linux/include/linux/genhd.h Thu Sep 24 18:55:43 1998 |
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@@ -69,12 +70,19 @@ |
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#ifdef CONFIG_BSD_DISKLABEL |
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/* |
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* BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il> |
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+ * |
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+ * updated by Marc Espie <Marc.Espie@openbsd.org> |
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*/ |
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+/* check against BSD src/sys/sys/disklabel.h for consistency */ |
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+ |
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#define BSD_PARTITION 0xa5 /* Partition ID */ |
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+#define OPENBSD_PARTITION 0xa6 |
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#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */ |
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#define BSD_MAXPARTITIONS 8 |
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+#define OPENBSD_MAXPARTITIONS 16 |
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+ |
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#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */ |
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struct bsd_disklabel { |
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__u32 d_magic; /* the magic number */ |
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---------------------------------------------------------------------- |
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It does: |
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- trigger the recognition of OpenBSD disklabels, |
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- force bsd partitions to appear at the end of the partition list, |
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- check the bsd disklabel for redundancy and consistency with the dos |
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partition table, so that the same partition does not show up twice. |
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You also need a working ufs, such as |
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<ftp://sunsite.unc.edu/pub/Linux/ALPHA/ufs/u2fs-0.4.3.tar.gz> |
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This package yields a new module, plus a small patch to tie the module |
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with the rest of the Linux kernel. I would recommend checking that patch |
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manually, as Linux module information tends to vary widely, and it is |
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pretty trivial to add by hand anyway. |
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As of pre4-2.2.0, the up-coming 2.2 linux kernel does incorporate my |
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patch to handle OpenBSD partitions, and remove duplicate partitions that |
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are referenced in both the disklabel for OpenBSD, and the MBR. |
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You also need a working ufs, which is also going to be in linux 2.2. |
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Running Linux binaries under OpenBSD |
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------------------------------------ |
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espie
25 years ago