#ifndef _ZFTAPE_VTBL_H #define _ZFTAPE_VTBL_H /* * Copyright (c) 1995-1997 Claus-Justus Heine 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 2, 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; see the file COPYING. If not, write to the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. * * $Source: /homes/cvs/ftape-stacked/ftape/zftape/zftape-vtbl.h,v $ * $Revision: 1.3 $ * $Date: 1997/10/28 14:30:09 $ * * This file defines a volume table as defined in the QIC-80 * development standards. */ #include <linux/list.h> #include "../lowlevel/ftape-tracing.h" #include "../zftape/zftape-eof.h" #include "../zftape/zftape-ctl.h" #include "../zftape/zftape-rw.h" #define VTBL_SIZE 128 /* bytes */ /* The following are offsets in the vtbl. */ #define VTBL_SIG 0 #define VTBL_START 4 #define VTBL_END 6 #define VTBL_DESC 8 #define VTBL_DATE 52 #define VTBL_FLAGS 56 #define VTBL_FL_VENDOR_SPECIFIC (1<<0) #define VTBL_FL_MUTLI_CARTRIDGE (1<<1) #define VTBL_FL_NOT_VERIFIED (1<<2) #define VTBL_FL_REDIR_INHIBIT (1<<3) #define VTBL_FL_SEG_SPANNING (1<<4) #define VTBL_FL_DIRECTORY_LAST (1<<5) #define VTBL_FL_RESERVED_6 (1<<6) #define VTBL_FL_RESERVED_7 (1<<7) #define VTBL_M_NO 57 #define VTBL_EXT 58 #define EXT_ZFTAPE_SIG 0 #define EXT_ZFTAPE_BLKSZ 10 #define EXT_ZFTAPE_CMAP 12 #define EXT_ZFTAPE_QIC113 13 #define VTBL_PWD 84 #define VTBL_DIR_SIZE 92 #define VTBL_DATA_SIZE 96 #define VTBL_OS_VERSION 104 #define VTBL_SRC_DRIVE 106 #define VTBL_DEV 122 #define VTBL_RESERVED_1 123 #define VTBL_CMPR 124 #define VTBL_CMPR_UNREG 0x3f #define VTBL_CMPR_USED 0x80 #define VTBL_FMT 125 #define VTBL_RESERVED_2 126 #define VTBL_RESERVED_3 127 /* compatibility with pre revision K */ #define VTBL_K_CMPR 120 /* the next is used by QIC-3020 tapes with format code 6 (>2^16 * segments) It is specified in QIC-113, Rev. G, Section 5 (SCSI * volume table). The difference is simply, that we only store the * number of segments used, not the starting segment. */ #define VTBL_SCSI_SEGS 4 /* is a 4 byte value */ /* one vtbl is 128 bytes, that results in a maximum number of * 29*1024/128 = 232 volumes. */ #define ZFT_MAX_VOLUMES (FT_SEGMENT_SIZE/VTBL_SIZE) #define VTBL_ID "VTBL" #define VTBL_IDS { VTBL_ID, "XTBL", "UTID", "EXVT" } /* other valid ids */ #define ZFT_VOL_NAME "zftape volume" /* volume label used by me */ #define ZFTAPE_SIG "LINUX ZFT" /* global variables */ typedef struct zft_internal_vtbl { struct list_head node; int count; unsigned int start_seg; /* 32 bits are enough for now */ unsigned int end_seg; /* 32 bits are enough for now */ __s64 size; /* uncompressed size */ unsigned int blk_sz; /* block size for this volume */ unsigned int zft_volume :1; /* zftape created this volume */ unsigned int use_compression:1; /* compressed volume */ unsigned int qic113 :1; /* layout of compressed block * info and vtbl conforms to * QIC-113, Rev. G */ unsigned int new_volume :1; /* it was created by us, this * run. this allows the * fields that aren't really * used by zftape to be filled * in by some user level * program. */ unsigned int open :1; /* just in progress of being * written */ } zft_volinfo; extern struct list_head zft_vtbl; #define zft_head_vtbl list_entry(zft_vtbl.next, zft_volinfo, node) #define zft_eom_vtbl list_entry(zft_vtbl.prev, zft_volinfo, node) #define zft_last_vtbl list_entry(zft_eom_vtbl->node.prev, zft_volinfo, node) #define zft_first_vtbl list_entry(zft_head_vtbl->node.next, zft_volinfo, node) #define zft_vtbl_empty (zft_eom_vtbl->node.prev == &zft_head_vtbl->node) #define DUMP_VOLINFO(level, desc, info) \ { \ char tmp[21]; \ strlcpy(tmp, desc, sizeof(tmp)); \ TRACE(level, "Volume %d:\n" \ KERN_INFO "description : %s\n" \ KERN_INFO "first segment: %d\n" \ KERN_INFO "last segment: %d\n" \ KERN_INFO "size : " LL_X "\n" \ KERN_INFO "block size : %d\n" \ KERN_INFO "compression : %d\n" \ KERN_INFO "zftape volume: %d\n" \ KERN_INFO "QIC-113 conf.: %d", \ (info)->count, tmp, (info)->start_seg, (info)->end_seg, \ LL((info)->size), (info)->blk_sz, \ (info)->use_compression != 0, (info)->zft_volume != 0, \ (info)->qic113 != 0); \ } extern int zft_qic_mode; extern int zft_old_ftape; extern int zft_volume_table_changed; /* exported functions */ extern void zft_init_vtbl (void); extern void zft_free_vtbl (void); extern int zft_extract_volume_headers(__u8 *buffer); extern int zft_update_volume_table (unsigned int segment); extern int zft_open_volume (zft_position *pos, int blk_sz, int use_compression); extern int zft_close_volume (zft_position *pos); extern const zft_volinfo *zft_find_volume(unsigned int seg_pos); extern int zft_skip_volumes (int count, zft_position *pos); extern __s64 zft_get_eom_pos (void); extern void zft_skip_to_eom (zft_position *pos); extern int zft_fake_volume_headers (eof_mark_union *eof_map, int num_failed_sectors); extern int zft_weof (unsigned int count, zft_position *pos); extern void zft_move_past_eof (zft_position *pos); static inline int zft_tape_at_eod (const zft_position *pos); static inline int zft_tape_at_lbot (const zft_position *pos); static inline void zft_position_before_eof (zft_position *pos, const zft_volinfo *volume); static inline __s64 zft_check_for_eof(const zft_volinfo *vtbl, const zft_position *pos); /* this function decrements the zft_seg_pos counter if we are right * at the beginning of a segment. This is to handle fsfm/bsfm -- we * need to position before the eof mark. NOTE: zft_tape_pos is not * changed */ static inline void zft_position_before_eof(zft_position *pos, const zft_volinfo *volume) { TRACE_FUN(ft_t_flow); if (pos->seg_pos == volume->end_seg + 1 && pos->seg_byte_pos == 0) { pos->seg_pos --; pos->seg_byte_pos = zft_get_seg_sz(pos->seg_pos); } TRACE_EXIT; } /* Mmmh. Is the position at the end of the last volume, that is right * before the last EOF mark also logical an EOD condition? */ static inline int zft_tape_at_eod(const zft_position *pos) { TRACE_FUN(ft_t_any); if (zft_qic_mode) { TRACE_EXIT (pos->seg_pos >= zft_eom_vtbl->start_seg || zft_last_vtbl->open); } else { TRACE_EXIT pos->seg_pos > ft_last_data_segment; } } static inline int zft_tape_at_lbot(const zft_position *pos) { if (zft_qic_mode) { return (pos->seg_pos <= zft_first_vtbl->start_seg && pos->volume_pos == 0); } else { return (pos->seg_pos <= ft_first_data_segment && pos->volume_pos == 0); } } /* This one checks for EOF. return remaing space (may be negative) */ static inline __s64 zft_check_for_eof(const zft_volinfo *vtbl, const zft_position *pos) { return (__s64)(vtbl->size - pos->volume_pos); } #endif /* _ZFTAPE_VTBL_H */