added bsd disklabel support

1 files changed, 138 insertions, 0 deletions

diff --git a/balkan/bsdlabel.c b/balkan/bsdlabel.c
new file mode 100644
index 000000000..4e89d133e
--- /dev/null
+++ b/balkan/bsdlabel.c
@@ -0,0 +1,138 @@
+/* Sun style partitioning */
+
+#include <fcntl.h>
+#include <unistd.h>
+
+#include "balkan.h"
+
+#define BSD_DISKMAGIC	(0x82564557UL)	/* The disk magic number */
+#define BSD_MAXPARTITIONS	8
+#define BSD_FS_UNUSED		0	/* disklabel unused partition entry ID */
+#define BSD_LABEL_OFFSET	64
+
+struct bsd_disklabel {
+    unsigned int	d_magic;		/* the magic number */
+    signed short	d_type;			/* drive type */
+    signed short	d_subtype;		/* controller/d_type specific */
+    char	d_typename[16];		/* type name, e.g. "eagle" */
+    char	d_packname[16];			/* pack identifier */ 
+    unsigned int	d_secsize;		/* # of bytes per sector */
+    unsigned int	d_nsectors;		/* # of data sectors per track */
+    unsigned int	d_ntracks;		/* # of tracks per cylinder */
+    unsigned int	d_ncylinders;		/* # of data cylinders per unit */
+    unsigned int	d_secpercyl;		/* # of data sectors per cylinder */
+    unsigned int	d_secperunit;		/* # of data sectors per unit */
+    unsigned short	d_sparespertrack;	/* # of spare sectors per track */
+    unsigned short	d_sparespercyl;		/* # of spare sectors per cylinder */
+    unsigned int	d_acylinders;		/* # of alt. cylinders per unit */
+    unsigned short	d_rpm;			/* rotational speed */
+    unsigned short	d_interleave;		/* hardware sector interleave */
+    unsigned short	d_trackskew;		/* sector 0 skew, per track */
+    unsigned short	d_cylskew;		/* sector 0 skew, per cylinder */
+    unsigned int	d_headswitch;		/* head switch time, usec */
+    unsigned int	d_trkseek;		/* track-to-track seek, usec */
+    unsigned int	d_flags;		/* generic flags */
+    #define NDDATA 5
+    unsigned int	d_drivedata[NDDATA];	/* drive-type specific information */
+    #define NSPARE 5
+    unsigned int	d_spare[NSPARE];	/* reserved for future use */
+    unsigned int	d_magic2;		/* the magic number (again) */
+    unsigned short	d_checksum;		/* xor of data incl. partitions */
+
+		    /* filesystem and partition information: */
+    unsigned short	d_npartitions;		/* number of partitions in following */
+    unsigned int	d_bbsize;		/* size of boot area at sn0, bytes */
+    unsigned int	d_sbsize;		/* max size of fs superblock, bytes */
+    struct	bsd_partition {		/* the partition table */
+	    unsigned int	p_size;		/* number of sectors in partition */
+	    unsigned int	p_offset;	/* starting sector */
+	    unsigned int	p_fsize;	/* filesystem basic fragment size */
+	    unsigned char	p_fstype;	/* filesystem type, see below */
+	    unsigned char	p_frag;		/* filesystem fragments per block */
+	    unsigned short	p_cpg;		/* filesystem cylinders per group */
+    } d_partitions[BSD_MAXPARTITIONS];	/* actually may be more */
+};
+
+long long llseek(int fd, long long offset, int whence);
+
+#if 0
+static unsigned short xbsd_dkcksum (struct bsd_disklabel *lp) {
+  unsigned short *start, *end;
+  unsigned short sum = 0;
+  
+  lp->d_checksum = 0;
+  start = (u_short *)lp;
+  end = (u_short *)&lp->d_partitions[lp->d_npartitions];
+  while (start < end)
+    sum ^= *start++;
+  return (sum);
+}
+#endif
+
+int bsdlReadTable(int fd, struct partitionTable * table) {
+    struct bsd_disklabel label;
+    int i, rc;
+    unsigned short *p, csum;
+    int s;
+
+    table->maxNumPartitions = 8;
+
+    for (i = 0; i < table->maxNumPartitions; i++)
+	table->parts[i].type = -1;
+
+    table->sectorSize = 512;
+
+    if (lseek(fd, BSD_LABEL_OFFSET, SEEK_SET) < 0)
+	return BALKAN_ERROR_ERRNO;
+
+    if (read(fd, &label, sizeof(label)) != sizeof(label))
+	return BALKAN_ERROR_ERRNO;
+
+    if (label.d_magic != BSD_DISKMAGIC) 
+	return BALKAN_ERROR_BADMAGIC;
+
+#if 0
+    /* minlabel doens't write checksums :-( */
+    if (xbsd_dkcksum(&label))
+	return BALKAN_ERROR_BADMAGIC;
+#endif
+
+    if (label.d_npartitions > 8)
+	label.d_npartitions = 8;
+
+    for (i = 0; i < label.d_npartitions; i++) {
+	if (label.d_partitions[i].p_size && label.d_partitions[i].p_fstype) {
+	    table->parts[i].startSector = label.d_partitions[i].p_offset;
+	    table->parts[i].size = label.d_partitions[i].p_size;
+	    table->parts[i].type = label.d_partitions[i].p_size;
+
+	    switch (label.d_partitions[i].p_fstype) {
+	      case 1: s = BALKAN_PART_SWAP; break;
+	      case 8: s = BALKAN_PART_EXT2; break;
+	      default: s = BALKAN_PART_OTHER; break;
+	    }
+	}
+    }
+
+    return 0;
+}
+
+#ifdef STANDALONE_TEST
+
+void main() {
+    int fd;
+    int i;
+    struct partitionTable table;
+
+    fd = open("/dev/hda", O_RDONLY);
+
+    printf("rc= %d\n", bsdlReadTable(fd, &table));
+
+    for (i = 0; i < table.maxNumPartitions; i++) {
+	if (table.parts[i].type == -1) continue;
+
+	printf("%d: %x %d\n", i, table.parts[i].type, table.parts[i].size);
+    }
+}
+
+#endif