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Diffstat (limited to 'drivers/char/ftape/zftape/zftape-vtbl.c')
-rw-r--r--drivers/char/ftape/zftape/zftape-vtbl.c757
1 files changed, 757 insertions, 0 deletions
diff --git a/drivers/char/ftape/zftape/zftape-vtbl.c b/drivers/char/ftape/zftape/zftape-vtbl.c
new file mode 100644
index 00000000000..ad7f8be6340
--- /dev/null
+++ b/drivers/char/ftape/zftape/zftape-vtbl.c
@@ -0,0 +1,757 @@
+/*
+ * 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.c,v $
+ * $Revision: 1.7.6.1 $
+ * $Date: 1997/11/24 13:48:31 $
+ *
+ * This file defines a volume table as defined in various QIC
+ * standards.
+ *
+ * This is a minimal implementation, just allowing ordinary DOS
+ * :( prgrams to identify the cartridge as used.
+ */
+
+#include <linux/errno.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+
+#include <linux/zftape.h>
+#include "../zftape/zftape-init.h"
+#include "../zftape/zftape-eof.h"
+#include "../zftape/zftape-ctl.h"
+#include "../zftape/zftape-write.h"
+#include "../zftape/zftape-read.h"
+#include "../zftape/zftape-rw.h"
+#include "../zftape/zftape-vtbl.h"
+
+#define ZFT_CMAP_HACK /* leave this defined to hide the compression map */
+
+/*
+ * global variables
+ */
+int zft_qic_mode = 1; /* use the vtbl */
+int zft_old_ftape; /* prevents old ftaped tapes to be overwritten */
+int zft_volume_table_changed; /* for write_header_segments() */
+
+/*
+ * private variables (only exported for inline functions)
+ */
+LIST_HEAD(zft_vtbl);
+
+/* We could also allocate these dynamically when extracting the volume table
+ * sizeof(zft_volinfo) is about 32 or something close to that
+ */
+static zft_volinfo tape_vtbl;
+static zft_volinfo eot_vtbl;
+static zft_volinfo *cur_vtbl;
+
+static inline void zft_new_vtbl_entry(void)
+{
+ struct list_head *tmp = &zft_last_vtbl->node;
+ zft_volinfo *new = zft_kmalloc(sizeof(zft_volinfo));
+
+ list_add(&new->node, tmp);
+ new->count = zft_eom_vtbl->count ++;
+}
+
+void zft_free_vtbl(void)
+{
+ for (;;) {
+ struct list_head *tmp = zft_vtbl.prev;
+ zft_volinfo *vtbl;
+
+ if (tmp == &zft_vtbl)
+ break;
+ list_del(tmp);
+ vtbl = list_entry(tmp, zft_volinfo, node);
+ zft_kfree(vtbl, sizeof(zft_volinfo));
+ }
+ INIT_LIST_HEAD(&zft_vtbl);
+ cur_vtbl = NULL;
+}
+
+/* initialize vtbl, called by ftape_new_cartridge()
+ */
+void zft_init_vtbl(void)
+{
+ zft_volinfo *new;
+
+ zft_free_vtbl();
+
+ /* Create the two dummy vtbl entries
+ */
+ new = zft_kmalloc(sizeof(zft_volinfo));
+ list_add(&new->node, &zft_vtbl);
+ new = zft_kmalloc(sizeof(zft_volinfo));
+ list_add(&new->node, &zft_vtbl);
+ zft_head_vtbl->end_seg = ft_first_data_segment;
+ zft_head_vtbl->blk_sz = zft_blk_sz;
+ zft_head_vtbl->count = -1;
+ zft_eom_vtbl->start_seg = ft_first_data_segment + 1;
+ zft_eom_vtbl->end_seg = ft_last_data_segment + 1;
+ zft_eom_vtbl->blk_sz = zft_blk_sz;
+ zft_eom_vtbl->count = 0;
+
+ /* Reset the pointer for zft_find_volume()
+ */
+ cur_vtbl = zft_eom_vtbl;
+
+ /* initialize the dummy vtbl entries for zft_qic_mode == 0
+ */
+ eot_vtbl.start_seg = ft_last_data_segment + 1;
+ eot_vtbl.end_seg = ft_last_data_segment + 1;
+ eot_vtbl.blk_sz = zft_blk_sz;
+ eot_vtbl.count = -1;
+ tape_vtbl.start_seg = ft_first_data_segment;
+ tape_vtbl.end_seg = ft_last_data_segment;
+ tape_vtbl.blk_sz = zft_blk_sz;
+ tape_vtbl.size = zft_capacity;
+ tape_vtbl.count = 0;
+}
+
+/* check for a valid VTBL signature.
+ */
+static int vtbl_signature_valid(__u8 signature[4])
+{
+ const char *vtbl_ids[] = VTBL_IDS; /* valid signatures */
+ int j;
+
+ for (j = 0;
+ (j < NR_ITEMS(vtbl_ids)) && (memcmp(signature, vtbl_ids[j], 4) != 0);
+ j++);
+ return j < NR_ITEMS(vtbl_ids);
+}
+
+/* We used to store the block-size of the volume in the volume-label,
+ * using the keyword "blocksize". The blocksize written to the
+ * volume-label is in bytes.
+ *
+ * We use this now only for compatibility with old zftape version. We
+ * store the blocksize directly as binary number in the vendor
+ * extension part of the volume entry.
+ */
+static int check_volume_label(const char *label, int *blk_sz)
+{
+ int valid_format;
+ char *blocksize;
+ TRACE_FUN(ft_t_flow);
+
+ TRACE(ft_t_noise, "called with \"%s\" / \"%s\"", label, ZFT_VOL_NAME);
+ if (strncmp(label, ZFT_VOL_NAME, strlen(ZFT_VOL_NAME)) != 0) {
+ *blk_sz = 1; /* smallest block size that we allow */
+ valid_format = 0;
+ } else {
+ TRACE(ft_t_noise, "got old style zftape vtbl entry");
+ /* get the default blocksize */
+ /* use the kernel strstr() */
+ blocksize= strstr(label, " blocksize ");
+ if (blocksize) {
+ blocksize += strlen(" blocksize ");
+ for(*blk_sz= 0;
+ *blocksize >= '0' && *blocksize <= '9';
+ blocksize++) {
+ *blk_sz *= 10;
+ *blk_sz += *blocksize - '0';
+ }
+ if (*blk_sz > ZFT_MAX_BLK_SZ) {
+ *blk_sz= 1;
+ valid_format= 0;
+ } else {
+ valid_format = 1;
+ }
+ } else {
+ *blk_sz= 1;
+ valid_format= 0;
+ }
+ }
+ TRACE_EXIT valid_format;
+}
+
+/* check for a zftape volume
+ */
+static int check_volume(__u8 *entry, zft_volinfo *volume)
+{
+ TRACE_FUN(ft_t_flow);
+
+ if(strncmp(&entry[VTBL_EXT+EXT_ZFTAPE_SIG], ZFTAPE_SIG,
+ strlen(ZFTAPE_SIG)) == 0) {
+ TRACE(ft_t_noise, "got new style zftape vtbl entry");
+ volume->blk_sz = GET2(entry, VTBL_EXT+EXT_ZFTAPE_BLKSZ);
+ volume->qic113 = entry[VTBL_EXT+EXT_ZFTAPE_QIC113];
+ TRACE_EXIT 1;
+ } else {
+ TRACE_EXIT check_volume_label(&entry[VTBL_DESC], &volume->blk_sz);
+ }
+}
+
+
+/* create zftape specific vtbl entry, the volume bounds are inserted
+ * in the calling function, zft_create_volume_headers()
+ */
+static void create_zft_volume(__u8 *entry, zft_volinfo *vtbl)
+{
+ TRACE_FUN(ft_t_flow);
+
+ memset(entry, 0, VTBL_SIZE);
+ memcpy(&entry[VTBL_SIG], VTBL_ID, 4);
+ sprintf(&entry[VTBL_DESC], ZFT_VOL_NAME" %03d", vtbl->count);
+ entry[VTBL_FLAGS] = (VTBL_FL_NOT_VERIFIED | VTBL_FL_SEG_SPANNING);
+ entry[VTBL_M_NO] = 1; /* multi_cartridge_count */
+ strcpy(&entry[VTBL_EXT+EXT_ZFTAPE_SIG], ZFTAPE_SIG);
+ PUT2(entry, VTBL_EXT+EXT_ZFTAPE_BLKSZ, vtbl->blk_sz);
+ if (zft_qic113) {
+ PUT8(entry, VTBL_DATA_SIZE, vtbl->size);
+ entry[VTBL_CMPR] = VTBL_CMPR_UNREG;
+ if (vtbl->use_compression) { /* use compression: */
+ entry[VTBL_CMPR] |= VTBL_CMPR_USED;
+ }
+ entry[VTBL_EXT+EXT_ZFTAPE_QIC113] = 1;
+ } else {
+ PUT4(entry, VTBL_DATA_SIZE, vtbl->size);
+ entry[VTBL_K_CMPR] = VTBL_CMPR_UNREG;
+ if (vtbl->use_compression) { /* use compression: */
+ entry[VTBL_K_CMPR] |= VTBL_CMPR_USED;
+ }
+ }
+ if (ft_format_code == fmt_big) {
+ /* SCSI like vtbl, store the number of used
+ * segments as 4 byte value
+ */
+ PUT4(entry, VTBL_SCSI_SEGS, vtbl->end_seg-vtbl->start_seg + 1);
+ } else {
+ /* normal, QIC-80MC like vtbl
+ */
+ PUT2(entry, VTBL_START, vtbl->start_seg);
+ PUT2(entry, VTBL_END, vtbl->end_seg);
+ }
+ TRACE_EXIT;
+}
+
+/* this one creates the volume headers for each volume. It is assumed
+ * that buffer already contains the old volume-table, so that vtbl
+ * entries without the zft_volume flag set can savely be ignored.
+ */
+static void zft_create_volume_headers(__u8 *buffer)
+{
+ __u8 *entry;
+ struct list_head *tmp;
+ zft_volinfo *vtbl;
+ TRACE_FUN(ft_t_flow);
+
+#ifdef ZFT_CMAP_HACK
+ if((strncmp(&buffer[VTBL_EXT+EXT_ZFTAPE_SIG], ZFTAPE_SIG,
+ strlen(ZFTAPE_SIG)) == 0) &&
+ buffer[VTBL_EXT+EXT_ZFTAPE_CMAP] != 0) {
+ TRACE(ft_t_noise, "deleting cmap volume");
+ memmove(buffer, buffer + VTBL_SIZE,
+ FT_SEGMENT_SIZE - VTBL_SIZE);
+ }
+#endif
+ entry = buffer;
+ for (tmp = zft_head_vtbl->node.next;
+ tmp != &zft_eom_vtbl->node;
+ tmp = tmp->next) {
+ vtbl = list_entry(tmp, zft_volinfo, node);
+ /* we now fill in the values only for newly created volumes.
+ */
+ if (vtbl->new_volume) {
+ create_zft_volume(entry, vtbl);
+ vtbl->new_volume = 0; /* clear the flag */
+ }
+
+ DUMP_VOLINFO(ft_t_noise, &entry[VTBL_DESC], vtbl);
+ entry += VTBL_SIZE;
+ }
+ memset(entry, 0, FT_SEGMENT_SIZE - zft_eom_vtbl->count * VTBL_SIZE);
+ TRACE_EXIT;
+}
+
+/* write volume table to tape. Calls zft_create_volume_headers()
+ */
+int zft_update_volume_table(unsigned int segment)
+{
+ int result = 0;
+ __u8 *verify_buf = NULL;
+ TRACE_FUN(ft_t_flow);
+
+ TRACE_CATCH(result = ftape_read_segment(ft_first_data_segment,
+ zft_deblock_buf,
+ FT_RD_SINGLE),);
+ zft_create_volume_headers(zft_deblock_buf);
+ TRACE(ft_t_noise, "writing volume table segment %d", segment);
+ if (zft_vmalloc_once(&verify_buf, FT_SEGMENT_SIZE) == 0) {
+ TRACE_CATCH(zft_verify_write_segments(segment,
+ zft_deblock_buf, result,
+ verify_buf),
+ zft_vfree(&verify_buf, FT_SEGMENT_SIZE));
+ zft_vfree(&verify_buf, FT_SEGMENT_SIZE);
+ } else {
+ TRACE_CATCH(ftape_write_segment(segment, zft_deblock_buf,
+ FT_WR_SINGLE),);
+ }
+ TRACE_EXIT 0;
+}
+
+/* non zftape volumes are handled in raw mode. Thus we need to
+ * calculate the raw amount of data contained in those segments.
+ */
+static void extract_alien_volume(__u8 *entry, zft_volinfo *vtbl)
+{
+ TRACE_FUN(ft_t_flow);
+
+ vtbl->size = (zft_calc_tape_pos(zft_last_vtbl->end_seg+1) -
+ zft_calc_tape_pos(zft_last_vtbl->start_seg));
+ vtbl->use_compression = 0;
+ vtbl->qic113 = zft_qic113;
+ if (vtbl->qic113) {
+ TRACE(ft_t_noise,
+ "Fake alien volume's size from " LL_X " to " LL_X,
+ LL(GET8(entry, VTBL_DATA_SIZE)), LL(vtbl->size));
+ } else {
+ TRACE(ft_t_noise,
+ "Fake alien volume's size from %d to " LL_X,
+ (int)GET4(entry, VTBL_DATA_SIZE), LL(vtbl->size));
+ }
+ TRACE_EXIT;
+}
+
+
+/* extract an zftape specific volume
+ */
+static void extract_zft_volume(__u8 *entry, zft_volinfo *vtbl)
+{
+ TRACE_FUN(ft_t_flow);
+
+ if (vtbl->qic113) {
+ vtbl->size = GET8(entry, VTBL_DATA_SIZE);
+ vtbl->use_compression =
+ (entry[VTBL_CMPR] & VTBL_CMPR_USED) != 0;
+ } else {
+ vtbl->size = GET4(entry, VTBL_DATA_SIZE);
+ if (entry[VTBL_K_CMPR] & VTBL_CMPR_UNREG) {
+ vtbl->use_compression =
+ (entry[VTBL_K_CMPR] & VTBL_CMPR_USED) != 0;
+ } else if (entry[VTBL_CMPR] & VTBL_CMPR_UNREG) {
+ vtbl->use_compression =
+ (entry[VTBL_CMPR] & VTBL_CMPR_USED) != 0;
+ } else {
+ TRACE(ft_t_warn, "Geeh! There is something wrong:\n"
+ KERN_INFO "QIC compression (Rev = K): %x\n"
+ KERN_INFO "QIC compression (Rev > K): %x",
+ entry[VTBL_K_CMPR], entry[VTBL_CMPR]);
+ }
+ }
+ TRACE_EXIT;
+}
+
+/* extract the volume table from buffer. "buffer" must already contain
+ * the vtbl-segment
+ */
+int zft_extract_volume_headers(__u8 *buffer)
+{
+ __u8 *entry;
+ TRACE_FUN(ft_t_flow);
+
+ zft_init_vtbl();
+ entry = buffer;
+#ifdef ZFT_CMAP_HACK
+ if ((strncmp(&entry[VTBL_EXT+EXT_ZFTAPE_SIG], ZFTAPE_SIG,
+ strlen(ZFTAPE_SIG)) == 0) &&
+ entry[VTBL_EXT+EXT_ZFTAPE_CMAP] != 0) {
+ TRACE(ft_t_noise, "ignoring cmap volume");
+ entry += VTBL_SIZE;
+ }
+#endif
+ /* the end of the vtbl is indicated by an invalid signature
+ */
+ while (vtbl_signature_valid(&entry[VTBL_SIG]) &&
+ (entry - buffer) < FT_SEGMENT_SIZE) {
+ zft_new_vtbl_entry();
+ if (ft_format_code == fmt_big) {
+ /* SCSI like vtbl, stores only the number of
+ * segments used
+ */
+ unsigned int num_segments= GET4(entry, VTBL_SCSI_SEGS);
+ zft_last_vtbl->start_seg = zft_eom_vtbl->start_seg;
+ zft_last_vtbl->end_seg =
+ zft_last_vtbl->start_seg + num_segments - 1;
+ } else {
+ /* `normal', QIC-80 like vtbl
+ */
+ zft_last_vtbl->start_seg = GET2(entry, VTBL_START);
+ zft_last_vtbl->end_seg = GET2(entry, VTBL_END);
+ }
+ zft_eom_vtbl->start_seg = zft_last_vtbl->end_seg + 1;
+ /* check if we created this volume and get the
+ * blk_sz
+ */
+ zft_last_vtbl->zft_volume = check_volume(entry, zft_last_vtbl);
+ if (zft_last_vtbl->zft_volume == 0) {
+ extract_alien_volume(entry, zft_last_vtbl);
+ } else {
+ extract_zft_volume(entry, zft_last_vtbl);
+ }
+ DUMP_VOLINFO(ft_t_noise, &entry[VTBL_DESC], zft_last_vtbl);
+ entry +=VTBL_SIZE;
+ }
+#if 0
+/*
+ * undefine to test end of tape handling
+ */
+ zft_new_vtbl_entry();
+ zft_last_vtbl->start_seg = zft_eom_vtbl->start_seg;
+ zft_last_vtbl->end_seg = ft_last_data_segment - 10;
+ zft_last_vtbl->blk_sz = zft_blk_sz;
+ zft_last_vtbl->zft_volume = 1;
+ zft_last_vtbl->qic113 = zft_qic113;
+ zft_last_vtbl->size = (zft_calc_tape_pos(zft_last_vtbl->end_seg+1)
+ - zft_calc_tape_pos(zft_last_vtbl->start_seg));
+#endif
+ TRACE_EXIT 0;
+}
+
+/* this functions translates the failed_sector_log, misused as
+ * EOF-marker list, into a virtual volume table. The table mustn't be
+ * written to tape, because this would occupy the first data segment,
+ * which should be the volume table, but is actually the first segment
+ * that is filled with data (when using standard ftape). We assume,
+ * that we get a non-empty failed_sector_log.
+ */
+int zft_fake_volume_headers (eof_mark_union *eof_map, int num_failed_sectors)
+{
+ unsigned int segment, sector;
+ int have_eom = 0;
+ int vol_no;
+ TRACE_FUN(ft_t_flow);
+
+ if ((num_failed_sectors >= 2) &&
+ (GET2(&eof_map[num_failed_sectors - 1].mark.segment, 0)
+ ==
+ GET2(&eof_map[num_failed_sectors - 2].mark.segment, 0) + 1) &&
+ (GET2(&eof_map[num_failed_sectors - 1].mark.date, 0) == 1)) {
+ /* this should be eom. We keep the remainder of the
+ * tape as another volume.
+ */
+ have_eom = 1;
+ }
+ zft_init_vtbl();
+ zft_eom_vtbl->start_seg = ft_first_data_segment;
+ for(vol_no = 0; vol_no < num_failed_sectors - have_eom; vol_no ++) {
+ zft_new_vtbl_entry();
+
+ segment = GET2(&eof_map[vol_no].mark.segment, 0);
+ sector = GET2(&eof_map[vol_no].mark.date, 0);
+
+ zft_last_vtbl->start_seg = zft_eom_vtbl->start_seg;
+ zft_last_vtbl->end_seg = segment;
+ zft_eom_vtbl->start_seg = segment + 1;
+ zft_last_vtbl->blk_sz = 1;
+ zft_last_vtbl->size =
+ (zft_calc_tape_pos(zft_last_vtbl->end_seg)
+ - zft_calc_tape_pos(zft_last_vtbl->start_seg)
+ + (sector-1) * FT_SECTOR_SIZE);
+ TRACE(ft_t_noise,
+ "failed sector log: segment: %d, sector: %d",
+ segment, sector);
+ DUMP_VOLINFO(ft_t_noise, "Faked volume", zft_last_vtbl);
+ }
+ if (!have_eom) {
+ zft_new_vtbl_entry();
+ zft_last_vtbl->start_seg = zft_eom_vtbl->start_seg;
+ zft_last_vtbl->end_seg = ft_last_data_segment;
+ zft_eom_vtbl->start_seg = ft_last_data_segment + 1;
+ zft_last_vtbl->size = zft_capacity;
+ zft_last_vtbl->size -= zft_calc_tape_pos(zft_last_vtbl->start_seg);
+ zft_last_vtbl->blk_sz = 1;
+ DUMP_VOLINFO(ft_t_noise, "Faked volume",zft_last_vtbl);
+ }
+ TRACE_EXIT 0;
+}
+
+/* update the internal volume table
+ *
+ * if before start of last volume: erase all following volumes if
+ * inside a volume: set end of volume to infinity
+ *
+ * this function is intended to be called every time _ftape_write() is
+ * called
+ *
+ * return: 0 if no new volume was created, 1 if a new volume was
+ * created
+ *
+ * NOTE: we don't need to check for zft_mode as ftape_write() does
+ * that already. This function gets never called without accessing
+ * zftape via the *qft* devices
+ */
+
+int zft_open_volume(zft_position *pos, int blk_sz, int use_compression)
+{
+ TRACE_FUN(ft_t_flow);
+
+ if (!zft_qic_mode) {
+ TRACE_EXIT 0;
+ }
+ if (zft_tape_at_lbot(pos)) {
+ zft_init_vtbl();
+ if(zft_old_ftape) {
+ /* clear old ftape's eof marks */
+ zft_clear_ftape_file_marks();
+ zft_old_ftape = 0; /* no longer old ftape */
+ }
+ zft_reset_position(pos);
+ }
+ if (pos->seg_pos != zft_last_vtbl->end_seg + 1) {
+ TRACE_ABORT(-EIO, ft_t_bug,
+ "BUG: seg_pos: %d, zft_last_vtbl->end_seg: %d",
+ pos->seg_pos, zft_last_vtbl->end_seg);
+ }
+ TRACE(ft_t_noise, "create new volume");
+ if (zft_eom_vtbl->count >= ZFT_MAX_VOLUMES) {
+ TRACE_ABORT(-ENOSPC, ft_t_err,
+ "Error: maxmimal number of volumes exhausted "
+ "(maxmimum is %d)", ZFT_MAX_VOLUMES);
+ }
+ zft_new_vtbl_entry();
+ pos->volume_pos = pos->seg_byte_pos = 0;
+ zft_last_vtbl->start_seg = pos->seg_pos;
+ zft_last_vtbl->end_seg = ft_last_data_segment; /* infinity */
+ zft_last_vtbl->blk_sz = blk_sz;
+ zft_last_vtbl->size = zft_capacity;
+ zft_last_vtbl->zft_volume = 1;
+ zft_last_vtbl->use_compression = use_compression;
+ zft_last_vtbl->qic113 = zft_qic113;
+ zft_last_vtbl->new_volume = 1;
+ zft_last_vtbl->open = 1;
+ zft_volume_table_changed = 1;
+ zft_eom_vtbl->start_seg = ft_last_data_segment + 1;
+ TRACE_EXIT 0;
+}
+
+/* perform mtfsf, mtbsf, not allowed without zft_qic_mode
+ */
+int zft_skip_volumes(int count, zft_position *pos)
+{
+ const zft_volinfo *vtbl;
+ TRACE_FUN(ft_t_flow);
+
+ TRACE(ft_t_noise, "count: %d", count);
+
+ vtbl= zft_find_volume(pos->seg_pos);
+ while (count > 0 && vtbl != zft_eom_vtbl) {
+ vtbl = list_entry(vtbl->node.next, zft_volinfo, node);
+ count --;
+ }
+ while (count < 0 && vtbl != zft_first_vtbl) {
+ vtbl = list_entry(vtbl->node.prev, zft_volinfo, node);
+ count ++;
+ }
+ pos->seg_pos = vtbl->start_seg;
+ pos->seg_byte_pos = 0;
+ pos->volume_pos = 0;
+ pos->tape_pos = zft_calc_tape_pos(pos->seg_pos);
+ zft_just_before_eof = vtbl->size == 0;
+ if (zft_cmpr_ops) {
+ (*zft_cmpr_ops->reset)();
+ }
+ zft_deblock_segment = -1; /* no need to keep cache */
+ TRACE(ft_t_noise, "repositioning to:\n"
+ KERN_INFO "zft_seg_pos : %d\n"
+ KERN_INFO "zft_seg_byte_pos : %d\n"
+ KERN_INFO "zft_tape_pos : " LL_X "\n"
+ KERN_INFO "zft_volume_pos : " LL_X "\n"
+ KERN_INFO "file number : %d",
+ pos->seg_pos, pos->seg_byte_pos,
+ LL(pos->tape_pos), LL(pos->volume_pos), vtbl->count);
+ zft_resid = count < 0 ? -count : count;
+ TRACE_EXIT zft_resid ? -EINVAL : 0;
+}
+
+/* the following simply returns the raw data position of the EOM
+ * marker, MTIOCSIZE ioctl
+ */
+__s64 zft_get_eom_pos(void)
+{
+ if (zft_qic_mode) {
+ return zft_calc_tape_pos(zft_eom_vtbl->start_seg);
+ } else {
+ /* there is only one volume in raw mode */
+ return zft_capacity;
+ }
+}
+
+/* skip to eom, used for MTEOM
+ */
+void zft_skip_to_eom(zft_position *pos)
+{
+ TRACE_FUN(ft_t_flow);
+ pos->seg_pos = zft_eom_vtbl->start_seg;
+ pos->seg_byte_pos =
+ pos->volume_pos =
+ zft_just_before_eof = 0;
+ pos->tape_pos = zft_calc_tape_pos(pos->seg_pos);
+ TRACE(ft_t_noise, "ftape positioned to segment %d, data pos " LL_X,
+ pos->seg_pos, LL(pos->tape_pos));
+ TRACE_EXIT;
+}
+
+/* write an EOF-marker by setting zft_last_vtbl->end_seg to seg_pos.
+ * NOTE: this function assumes that zft_last_vtbl points to a valid
+ * vtbl entry
+ *
+ * NOTE: this routine always positions before the EOF marker
+ */
+int zft_close_volume(zft_position *pos)
+{
+ TRACE_FUN(ft_t_any);
+
+ if (zft_vtbl_empty || !zft_last_vtbl->open) { /* should not happen */
+ TRACE(ft_t_noise, "There are no volumes to finish");
+ TRACE_EXIT -EIO;
+ }
+ if (pos->seg_byte_pos == 0 &&
+ pos->seg_pos != zft_last_vtbl->start_seg) {
+ pos->seg_pos --;
+ pos->seg_byte_pos = zft_get_seg_sz(pos->seg_pos);
+ }
+ zft_last_vtbl->end_seg = pos->seg_pos;
+ zft_last_vtbl->size = pos->volume_pos;
+ zft_volume_table_changed = 1;
+ zft_just_before_eof = 1;
+ zft_eom_vtbl->start_seg = zft_last_vtbl->end_seg + 1;
+ zft_last_vtbl->open = 0; /* closed */
+ TRACE_EXIT 0;
+}
+
+/* write count file-marks at current position.
+ *
+ * The tape is positioned after the eof-marker, that is at byte 0 of
+ * the segment following the eof-marker
+ *
+ * this function is only allowed in zft_qic_mode
+ *
+ * Only allowed when tape is at BOT or EOD.
+ */
+int zft_weof(unsigned int count, zft_position *pos)
+{
+
+ TRACE_FUN(ft_t_flow);
+
+ if (!count) { /* write zero EOF marks should be a real no-op */
+ TRACE_EXIT 0;
+ }
+ zft_volume_table_changed = 1;
+ if (zft_tape_at_lbot(pos)) {
+ zft_init_vtbl();
+ if(zft_old_ftape) {
+ /* clear old ftape's eof marks */
+ zft_clear_ftape_file_marks();
+ zft_old_ftape = 0; /* no longer old ftape */
+ }
+ }
+ if (zft_last_vtbl->open) {
+ zft_close_volume(pos);
+ zft_move_past_eof(pos);
+ count --;
+ }
+ /* now it's easy, just append eof-marks, that is empty
+ * volumes, to the end of the already recorded media.
+ */
+ while (count > 0 &&
+ pos->seg_pos <= ft_last_data_segment &&
+ zft_eom_vtbl->count < ZFT_MAX_VOLUMES) {
+ TRACE(ft_t_noise,
+ "Writing zero sized file at segment %d", pos->seg_pos);
+ zft_new_vtbl_entry();
+ zft_last_vtbl->start_seg = pos->seg_pos;
+ zft_last_vtbl->end_seg = pos->seg_pos;
+ zft_last_vtbl->size = 0;
+ zft_last_vtbl->blk_sz = zft_blk_sz;
+ zft_last_vtbl->zft_volume = 1;
+ zft_last_vtbl->use_compression = 0;
+ pos->tape_pos += zft_get_seg_sz(pos->seg_pos);
+ zft_eom_vtbl->start_seg = ++ pos->seg_pos;
+ count --;
+ }
+ if (count > 0) {
+ /* there are two possibilities: end of tape, or the
+ * maximum number of files is exhausted.
+ */
+ zft_resid = count;
+ TRACE(ft_t_noise,"Number of marks NOT written: %d", zft_resid);
+ if (zft_eom_vtbl->count == ZFT_MAX_VOLUMES) {
+ TRACE_ABORT(-EINVAL, ft_t_warn,
+ "maximum allowed number of files "
+ "exhausted: %d", ZFT_MAX_VOLUMES);
+ } else {
+ TRACE_ABORT(-ENOSPC,
+ ft_t_noise, "reached end of tape");
+ }
+ }
+ TRACE_EXIT 0;
+}
+
+const zft_volinfo *zft_find_volume(unsigned int seg_pos)
+{
+ TRACE_FUN(ft_t_flow);
+
+ TRACE(ft_t_any, "called with seg_pos %d",seg_pos);
+ if (!zft_qic_mode) {
+ if (seg_pos > ft_last_data_segment) {
+ TRACE_EXIT &eot_vtbl;
+ }
+ tape_vtbl.blk_sz = zft_blk_sz;
+ TRACE_EXIT &tape_vtbl;
+ }
+ if (seg_pos < zft_first_vtbl->start_seg) {
+ TRACE_EXIT (cur_vtbl = zft_first_vtbl);
+ }
+ while (seg_pos > cur_vtbl->end_seg) {
+ cur_vtbl = list_entry(cur_vtbl->node.next, zft_volinfo, node);
+ TRACE(ft_t_noise, "%d - %d", cur_vtbl->start_seg, cur_vtbl->end_seg);
+ }
+ while (seg_pos < cur_vtbl->start_seg) {
+ cur_vtbl = list_entry(cur_vtbl->node.prev, zft_volinfo, node);
+ TRACE(ft_t_noise, "%d - %d", cur_vtbl->start_seg, cur_vtbl->end_seg);
+ }
+ if (seg_pos > cur_vtbl->end_seg || seg_pos < cur_vtbl->start_seg) {
+ TRACE(ft_t_bug, "This cannot happen");
+ }
+ DUMP_VOLINFO(ft_t_noise, "", cur_vtbl);
+ TRACE_EXIT cur_vtbl;
+}
+
+/* this function really assumes that we are just before eof
+ */
+void zft_move_past_eof(zft_position *pos)
+{
+ TRACE_FUN(ft_t_flow);
+
+ TRACE(ft_t_noise, "old seg. pos: %d", pos->seg_pos);
+ pos->tape_pos += zft_get_seg_sz(pos->seg_pos++) - pos->seg_byte_pos;
+ pos->seg_byte_pos = 0;
+ pos->volume_pos = 0;
+ if (zft_cmpr_ops) {
+ (*zft_cmpr_ops->reset)();
+ }
+ zft_just_before_eof = 0;
+ zft_deblock_segment = -1; /* no need to cache it anymore */
+ TRACE(ft_t_noise, "new seg. pos: %d", pos->seg_pos);
+ TRACE_EXIT;
+}