diff options
Diffstat (limited to 'drivers/char/ftape/zftape/zftape-vtbl.c')
| -rw-r--r-- | drivers/char/ftape/zftape/zftape-vtbl.c | 757 |
1 files changed, 0 insertions, 757 deletions
diff --git a/drivers/char/ftape/zftape/zftape-vtbl.c b/drivers/char/ftape/zftape/zftape-vtbl.c deleted file mode 100644 index ad7f8be6340bd4..00000000000000 --- a/drivers/char/ftape/zftape/zftape-vtbl.c +++ /dev/null @@ -1,757 +0,0 @@ -/* - * 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; -} |