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Diffstat (limited to 'drivers/char/ftape/zftape/zftape-vtbl.h')
-rw-r--r--drivers/char/ftape/zftape/zftape-vtbl.h227
1 files changed, 227 insertions, 0 deletions
diff --git a/drivers/char/ftape/zftape/zftape-vtbl.h b/drivers/char/ftape/zftape/zftape-vtbl.h
new file mode 100644
index 00000000000..f31d196d175
--- /dev/null
+++ b/drivers/char/ftape/zftape/zftape-vtbl.h
@@ -0,0 +1,227 @@
+#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 */