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Diffstat (limited to '')
| -rw-r--r-- | libparted/labels/dvh.h | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/libparted/labels/dvh.h b/libparted/labels/dvh.h new file mode 100644 index 0000000..7e7fae7 --- /dev/null +++ b/libparted/labels/dvh.h @@ -0,0 +1,178 @@ +/* + Copyright (C) 1985 MIPS Computer Systems, Inc. + Copyright (C) 2000 Silicon Graphics Computer Systems, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +#ifndef _SYS_DVH_H +#define _SYS_DVH_H + +/* + * Format for volume header information + * + * The volume header is a block located at the beginning of all disk + * media (sector 0). It contains information pertaining to physical + * device parameters and logical partition information. + * + * The volume header is manipulated by disk formatters/verifiers, + * partition builders (e.g. fx, dvhtool, and mkfs), and disk drivers. + * + * Previous versions of IRIX wrote a copy of the volume header is + * located at sector 0 of each track of cylinder 0. These copies were + * never used, and reduced the capacity of the volume header to hold large + * files, so this practice was discontinued. + * The volume header is constrained to be less than or equal to 512 + * bytes long. A particular copy is assumed valid if no drive errors + * are detected, the magic number is correct, and the 32 bit 2's complement + * of the volume header is correct. The checksum is calculated by initially + * zeroing vh_csum, summing the entire structure and then storing the + * 2's complement of the sum. Thus a checksum to verify the volume header + * should be 0. + * + * The error summary table, bad sector replacement table, and boot blocks are + * located by searching the volume directory within the volume header. + * + * Tables are sized simply by the integral number of table records that + * will fit in the space indicated by the directory entry. + * + * The amount of space allocated to the volume header, replacement blocks, + * and other tables is user defined when the device is formatted. + */ + +/* + * device parameters are in the volume header to determine mapping + * from logical block numbers to physical device addresses + * + * Linux doesn't care ... + */ +struct device_parameters { + unsigned char dp_skew; /* spiral addressing skew */ + unsigned char dp_gap1; /* words of 0 before header */ + unsigned char dp_gap2; /* words of 0 between hdr and data */ + unsigned char dp_spares_cyl; /* This is for drives (such as SCSI + that support zone oriented sparing, where the zone is larger + than one track. It gets subracteded from the cylinder size + ( dp_trks0 * dp_sec) when doing partition size calculations */ + unsigned short dp_cyls; /* number of usable cylinders (i.e., + doesn't include cylinders reserved by the drive for badblocks, + etc.). For drives with variable geometry, this number may be + decreased so that: + dp_cyls * ((dp_heads * dp_trks0) - dp_spares_cyl) <= actualcapacity + This happens on SCSI drives such as the Wren IV and Toshiba 156 + Also see dp_cylshi below */ + unsigned short dp_shd0; /* starting head vol 0 */ + unsigned short dp_trks0; /* number of tracks / cylinder vol 0*/ + unsigned char dp_ctq_depth; /* Depth of CTQ queue */ + unsigned char dp_cylshi; /* high byte of 24 bits of cylinder count */ + unsigned short dp_unused; /* not used */ + unsigned short dp_secs; /* number of sectors/track */ + unsigned short dp_secbytes; /* length of sector in bytes */ + unsigned short dp_interleave; /* sector interleave */ + int dp_flags; /* controller characteristics */ + int dp_datarate; /* bytes/sec for kernel stats */ + int dp_nretries; /* max num retries on data error */ + int dp_mspw; /* ms per word to xfer, for iostat */ + unsigned short dp_xgap1; /* Gap 1 for xylogics controllers */ + unsigned short dp_xsync; /* sync delay for xylogics controllers */ + unsigned short dp_xrdly; /* read delay for xylogics controllers */ + unsigned short dp_xgap2; /* gap 2 for xylogics controllers */ + unsigned short dp_xrgate; /* read gate for xylogics controllers */ + unsigned short dp_xwcont; /* write continuation for xylogics */ +}; + +/* + * Device characterization flags + * (dp_flags) + */ +#define DP_SECTSLIP 0x00000001 /* sector slip to spare sector */ +#define DP_SECTFWD 0x00000002 /* forward to replacement sector */ +#define DP_TRKFWD 0x00000004 /* forward to replacement track */ +#define DP_MULTIVOL 0x00000008 /* multiple volumes per spindle */ +#define DP_IGNOREERRORS 0x00000010 /* transfer data regardless of errors */ +#define DP_RESEEK 0x00000020 /* recalibrate as last resort */ +#define DP_CTQ_EN 0x00000040 /* enable command tag queueing */ + +/* + * Boot blocks, bad sector tables, and the error summary table, are located + * via the volume_directory. + */ +#define VDNAMESIZE 8 + +struct volume_directory { + char vd_name[VDNAMESIZE]; /* name */ + unsigned int vd_lbn; /* logical block number */ + unsigned int vd_nbytes; /* file length in bytes */ +}; + +/* + * partition table describes logical device partitions + * (device drivers examine this to determine mapping from logical units + * to cylinder groups, device formatters/verifiers examine this to determine + * location of replacement tracks/sectors, etc) + * + * NOTE: pt_firstlbn SHOULD BE CYLINDER ALIGNED + */ +struct partition_table { /* one per logical partition */ + unsigned int pt_nblks; /* # of logical blks in partition */ + unsigned int pt_firstlbn; /* first lbn of partition */ + int pt_type; /* use of partition */ +}; + +#define PTYPE_VOLHDR 0 /* partition is volume header */ +#define PTYPE_TRKREPL 1 /* partition is used for repl trks */ +#define PTYPE_SECREPL 2 /* partition is used for repl secs */ +#define PTYPE_RAW 3 /* partition is used for data */ +#define PTYPE_BSD42 4 /* partition is 4.2BSD file system */ +#define PTYPE_BSD 4 /* partition is 4.2BSD file system */ +#define PTYPE_SYSV 5 /* partition is SysV file system */ +#define PTYPE_VOLUME 6 /* partition is entire volume */ +#define PTYPE_EFS 7 /* partition is sgi EFS */ +#define PTYPE_LVOL 8 /* partition is part of a logical vol */ +#define PTYPE_RLVOL 9 /* part of a "raw" logical vol */ +#define PTYPE_XFS 10 /* partition is sgi XFS */ +#define PTYPE_XFSLOG 11 /* partition is sgi XFS log */ +#define PTYPE_XLV 12 /* partition is part of an XLV vol */ +#define PTYPE_XVM 13 /* partition is sgi XVM */ +#define NPTYPES 16 + +#define VHMAGIC 0xbe5a941 /* randomly chosen value */ +#define NPARTAB 16 /* 16 unix partitions */ +#define NVDIR 15 /* max of 15 directory entries */ +#define BFNAMESIZE 16 /* max 16 chars in boot file name */ + +/* Partition types for ARCS */ +#define NOT_USED 0 /* Not used */ +#define FAT_SHORT 1 /* FAT file system, 12-bit FAT entries */ +#define FAT_LONG 4 /* FAT file system, 16-bit FAT entries */ +#define EXTENDED 5 /* extended partition */ +#define HUGE 6 /* huge partition- MS/DOS 4.0 and later */ + +/* Active flags for ARCS */ +#define BOOTABLE 0x00; +#define NOT_BOOTABLE 0x80; + +struct volume_header { + int vh_magic; /* identifies volume header */ + short vh_rootpt; /* root partition number */ + short vh_swappt; /* swap partition number */ + char vh_bootfile[BFNAMESIZE]; /* name of file to boot */ + struct device_parameters vh_dp; /* device parameters */ + struct volume_directory vh_vd[NVDIR]; /* other vol hdr contents */ + struct partition_table vh_pt[NPARTAB]; /* device partition layout */ + int vh_csum; /* volume header checksum */ + int vh_fill; /* fill out to 512 bytes */ +}; + +#endif /* _SYS_DVH_H */ |