228 lines
7.5 KiB
C
228 lines
7.5 KiB
C
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#ifndef _ZFTAPE_VTBL_H
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#define _ZFTAPE_VTBL_H
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/*
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* Copyright (c) 1995-1997 Claus-Justus Heine
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2, or (at
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your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
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USA.
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*
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* $Source: /homes/cvs/ftape-stacked/ftape/zftape/zftape-vtbl.h,v $
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* $Revision: 1.3 $
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* $Date: 1997/10/28 14:30:09 $
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*
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* This file defines a volume table as defined in the QIC-80
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* development standards.
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*/
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#include <linux/list.h>
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#include "../lowlevel/ftape-tracing.h"
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#include "../zftape/zftape-eof.h"
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#include "../zftape/zftape-ctl.h"
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#include "../zftape/zftape-rw.h"
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#define VTBL_SIZE 128 /* bytes */
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/* The following are offsets in the vtbl. */
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#define VTBL_SIG 0
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#define VTBL_START 4
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#define VTBL_END 6
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#define VTBL_DESC 8
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#define VTBL_DATE 52
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#define VTBL_FLAGS 56
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#define VTBL_FL_VENDOR_SPECIFIC (1<<0)
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#define VTBL_FL_MUTLI_CARTRIDGE (1<<1)
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#define VTBL_FL_NOT_VERIFIED (1<<2)
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#define VTBL_FL_REDIR_INHIBIT (1<<3)
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#define VTBL_FL_SEG_SPANNING (1<<4)
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#define VTBL_FL_DIRECTORY_LAST (1<<5)
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#define VTBL_FL_RESERVED_6 (1<<6)
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#define VTBL_FL_RESERVED_7 (1<<7)
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#define VTBL_M_NO 57
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#define VTBL_EXT 58
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#define EXT_ZFTAPE_SIG 0
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#define EXT_ZFTAPE_BLKSZ 10
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#define EXT_ZFTAPE_CMAP 12
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#define EXT_ZFTAPE_QIC113 13
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#define VTBL_PWD 84
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#define VTBL_DIR_SIZE 92
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#define VTBL_DATA_SIZE 96
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#define VTBL_OS_VERSION 104
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#define VTBL_SRC_DRIVE 106
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#define VTBL_DEV 122
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#define VTBL_RESERVED_1 123
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#define VTBL_CMPR 124
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#define VTBL_CMPR_UNREG 0x3f
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#define VTBL_CMPR_USED 0x80
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#define VTBL_FMT 125
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#define VTBL_RESERVED_2 126
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#define VTBL_RESERVED_3 127
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/* compatibility with pre revision K */
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#define VTBL_K_CMPR 120
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/* the next is used by QIC-3020 tapes with format code 6 (>2^16
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* segments) It is specified in QIC-113, Rev. G, Section 5 (SCSI
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* volume table). The difference is simply, that we only store the
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* number of segments used, not the starting segment.
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*/
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#define VTBL_SCSI_SEGS 4 /* is a 4 byte value */
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/* one vtbl is 128 bytes, that results in a maximum number of
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* 29*1024/128 = 232 volumes.
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*/
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#define ZFT_MAX_VOLUMES (FT_SEGMENT_SIZE/VTBL_SIZE)
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#define VTBL_ID "VTBL"
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#define VTBL_IDS { VTBL_ID, "XTBL", "UTID", "EXVT" } /* other valid ids */
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#define ZFT_VOL_NAME "zftape volume" /* volume label used by me */
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#define ZFTAPE_SIG "LINUX ZFT"
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/* global variables
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*/
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typedef struct zft_internal_vtbl
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{
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struct list_head node;
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int count;
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unsigned int start_seg; /* 32 bits are enough for now */
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unsigned int end_seg; /* 32 bits are enough for now */
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__s64 size; /* uncompressed size */
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unsigned int blk_sz; /* block size for this volume */
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unsigned int zft_volume :1; /* zftape created this volume */
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unsigned int use_compression:1; /* compressed volume */
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unsigned int qic113 :1; /* layout of compressed block
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* info and vtbl conforms to
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* QIC-113, Rev. G
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*/
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unsigned int new_volume :1; /* it was created by us, this
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* run. this allows the
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* fields that aren't really
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* used by zftape to be filled
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* in by some user level
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* program.
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*/
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unsigned int open :1; /* just in progress of being
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* written
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*/
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} zft_volinfo;
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extern struct list_head zft_vtbl;
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#define zft_head_vtbl list_entry(zft_vtbl.next, zft_volinfo, node)
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#define zft_eom_vtbl list_entry(zft_vtbl.prev, zft_volinfo, node)
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#define zft_last_vtbl list_entry(zft_eom_vtbl->node.prev, zft_volinfo, node)
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#define zft_first_vtbl list_entry(zft_head_vtbl->node.next, zft_volinfo, node)
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#define zft_vtbl_empty (zft_eom_vtbl->node.prev == &zft_head_vtbl->node)
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#define DUMP_VOLINFO(level, desc, info) \
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{ \
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char tmp[21]; \
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strlcpy(tmp, desc, sizeof(tmp)); \
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TRACE(level, "Volume %d:\n" \
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KERN_INFO "description : %s\n" \
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KERN_INFO "first segment: %d\n" \
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KERN_INFO "last segment: %d\n" \
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KERN_INFO "size : " LL_X "\n" \
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KERN_INFO "block size : %d\n" \
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KERN_INFO "compression : %d\n" \
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KERN_INFO "zftape volume: %d\n" \
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KERN_INFO "QIC-113 conf.: %d", \
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(info)->count, tmp, (info)->start_seg, (info)->end_seg, \
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LL((info)->size), (info)->blk_sz, \
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(info)->use_compression != 0, (info)->zft_volume != 0, \
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(info)->qic113 != 0); \
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}
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extern int zft_qic_mode;
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extern int zft_old_ftape;
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extern int zft_volume_table_changed;
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/* exported functions */
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extern void zft_init_vtbl (void);
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extern void zft_free_vtbl (void);
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extern int zft_extract_volume_headers(__u8 *buffer);
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extern int zft_update_volume_table (unsigned int segment);
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extern int zft_open_volume (zft_position *pos,
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int blk_sz, int use_compression);
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extern int zft_close_volume (zft_position *pos);
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extern const zft_volinfo *zft_find_volume(unsigned int seg_pos);
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extern int zft_skip_volumes (int count, zft_position *pos);
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extern __s64 zft_get_eom_pos (void);
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extern void zft_skip_to_eom (zft_position *pos);
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extern int zft_fake_volume_headers (eof_mark_union *eof_map,
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int num_failed_sectors);
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extern int zft_weof (unsigned int count, zft_position *pos);
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extern void zft_move_past_eof (zft_position *pos);
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static inline int zft_tape_at_eod (const zft_position *pos);
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static inline int zft_tape_at_lbot (const zft_position *pos);
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static inline void zft_position_before_eof (zft_position *pos,
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const zft_volinfo *volume);
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static inline __s64 zft_check_for_eof(const zft_volinfo *vtbl,
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const zft_position *pos);
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/* this function decrements the zft_seg_pos counter if we are right
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* at the beginning of a segment. This is to handle fsfm/bsfm -- we
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* need to position before the eof mark. NOTE: zft_tape_pos is not
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* changed
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*/
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static inline void zft_position_before_eof(zft_position *pos,
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const zft_volinfo *volume)
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{
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TRACE_FUN(ft_t_flow);
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if (pos->seg_pos == volume->end_seg + 1 && pos->seg_byte_pos == 0) {
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pos->seg_pos --;
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pos->seg_byte_pos = zft_get_seg_sz(pos->seg_pos);
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}
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TRACE_EXIT;
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}
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/* Mmmh. Is the position at the end of the last volume, that is right
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* before the last EOF mark also logical an EOD condition?
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*/
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static inline int zft_tape_at_eod(const zft_position *pos)
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{
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TRACE_FUN(ft_t_any);
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if (zft_qic_mode) {
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TRACE_EXIT (pos->seg_pos >= zft_eom_vtbl->start_seg ||
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zft_last_vtbl->open);
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} else {
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TRACE_EXIT pos->seg_pos > ft_last_data_segment;
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}
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}
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static inline int zft_tape_at_lbot(const zft_position *pos)
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{
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if (zft_qic_mode) {
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return (pos->seg_pos <= zft_first_vtbl->start_seg &&
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pos->volume_pos == 0);
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} else {
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return (pos->seg_pos <= ft_first_data_segment &&
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pos->volume_pos == 0);
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}
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}
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/* This one checks for EOF. return remaing space (may be negative)
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*/
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static inline __s64 zft_check_for_eof(const zft_volinfo *vtbl,
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const zft_position *pos)
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{
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return (__s64)(vtbl->size - pos->volume_pos);
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}
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#endif /* _ZFTAPE_VTBL_H */
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