Remove long-unmaintained ftape driver subsystem.

It's bitrotten, long unmaintained, long hidden under BROKEN_ON_SMP,
etc.  As scheduled in feature-removal-schedule.txt, and ack'd several
times on lkml.

Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 0 insertions, 377 deletions

diff --git a/drivers/char/ftape/zftape/zftape-read.c b/drivers/char/ftape/zftape/zftape-read.c
deleted file mode 100644
index 214bf03dce68..000000000000
--- a/drivers/char/ftape/zftape/zftape-read.c
+++ /dev/null
@@ -1,377 +0,0 @@
-/*
- *      Copyright (C) 1996, 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-read.c,v $
- * $Revision: 1.2 $
- * $Date: 1997/10/05 19:19:06 $
- *
- *      This file contains the high level reading code
- *      for the QIC-117 floppy-tape driver for Linux.
- */
-
-#include <linux/errno.h>
-#include <linux/mm.h>
-
-#include <linux/zftape.h>
-
-#include <asm/uaccess.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"
-
-/*      Global vars.
- */
-int zft_just_before_eof;
-
-/*      Local vars.
- */
-static int buf_len_rd;
-
-void zft_zap_read_buffers(void)
-{
-	buf_len_rd = 0;
-}
-
-int zft_read_header_segments(void)      
-{
-	TRACE_FUN(ft_t_flow);
-
-	zft_header_read = 0;
-	TRACE_CATCH(zft_vmalloc_once(&zft_hseg_buf, FT_SEGMENT_SIZE),);
-	TRACE_CATCH(ftape_read_header_segment(zft_hseg_buf),);
-	TRACE(ft_t_info, "Segments written since first format: %d",
-	      (int)GET4(zft_hseg_buf, FT_SEG_CNT));
-	zft_qic113 = (ft_format_code != fmt_normal &&
-		      ft_format_code != fmt_1100ft &&
-		      ft_format_code != fmt_425ft);
-	TRACE(ft_t_info, "ft_first_data_segment: %d, ft_last_data_segment: %d", 
-	      ft_first_data_segment, ft_last_data_segment);
-	zft_capacity = zft_get_capacity();
-	zft_old_ftape = zft_ftape_validate_label(&zft_hseg_buf[FT_LABEL]);
-	if (zft_old_ftape) {
-		TRACE(ft_t_info, 
-"Found old ftaped tape, emulating eof marks, entering read-only mode");
-		zft_ftape_extract_file_marks(zft_hseg_buf);
-		TRACE_CATCH(zft_fake_volume_headers(zft_eof_map, 
-						    zft_nr_eof_marks),);
-	} else {
-		/* the specs say that the volume table must be
-		 * initialized with zeroes during formatting, so it
-		 * MUST be readable, i.e. contain vaid ECC
-		 * information.  
-		 */
-		TRACE_CATCH(ftape_read_segment(ft_first_data_segment, 
-					       zft_deblock_buf, 
-					       FT_RD_SINGLE),);
-		TRACE_CATCH(zft_extract_volume_headers(zft_deblock_buf),);
-	}
-	zft_header_read = 1;
-	zft_set_flags(zft_unit);
-	zft_reset_position(&zft_pos);
-	TRACE_EXIT 0;
-}
-
-int zft_fetch_segment_fraction(const unsigned int segment, void *buffer,
-			       const ft_read_mode_t read_mode,
-			       const unsigned int start,
-			       const unsigned int size)
-{
-	int seg_sz;
-	TRACE_FUN(ft_t_flow);
-
-	if (segment == zft_deblock_segment) {
-		TRACE(ft_t_data_flow,
-		      "re-using segment %d already in deblock buffer",
-		      segment);
-		seg_sz = zft_get_seg_sz(segment);
-		if (start > seg_sz) {
-			TRACE_ABORT(-EINVAL, ft_t_bug,
-				    "trying to read beyond end of segment:\n"
-				    KERN_INFO "seg_sz : %d\n"
-				    KERN_INFO "start  : %d\n"
-				    KERN_INFO "segment: %d",
-				    seg_sz, start, segment);
-		}
-		if ((start + size) > seg_sz) {
-			TRACE_EXIT seg_sz - start;
-		}
-		TRACE_EXIT size;
-	}
-	seg_sz = ftape_read_segment_fraction(segment, buffer, read_mode,
-					     start, size);
-	TRACE(ft_t_data_flow, "segment %d, result %d", segment, seg_sz);
-	if ((int)seg_sz >= 0 && start == 0 && size == FT_SEGMENT_SIZE) {
-		/*  this implicitly assumes that we are always called with
-		 *  buffer == zft_deblock_buf 
-		 */
-		zft_deblock_segment = segment;
-	} else {
-		zft_deblock_segment = -1;
-	}
-	TRACE_EXIT seg_sz;
-}
-
-/*
- * out:
- *
- * int *read_cnt: the number of bytes we removed from the
- *                zft_deblock_buf (result)
- *
- * int *to_do   : the remaining size of the read-request. Is changed.
- *
- * in:
- *
- * char *buff      : buff is the address of the upper part of the user
- *                   buffer, that hasn't been filled with data yet.
- * int buf_pos_read: copy of buf_pos_rd
- * int buf_len_read: copy of buf_len_rd
- * char *zft_deblock_buf: ftape_zft_deblock_buf
- *
- * returns the amount of data actually copied to the user-buffer
- *
- * to_do MUST NOT SHRINK except to indicate an EOT. In this case to_do
- * has to be set to 0. We cannot return -ENOSPC, because we return the
- * amount of data actually * copied to the user-buffer
- */
-static int zft_simple_read (int *read_cnt, 
-			    __u8  __user *dst_buf, 
-			    const int to_do, 
-			    const __u8 *src_buf, 
-			    const int seg_sz, 
-			    const zft_position *pos,
-			    const zft_volinfo *volume)
-{
-	TRACE_FUN(ft_t_flow);
-
-	if (seg_sz - pos->seg_byte_pos < to_do) {
-		*read_cnt = seg_sz - pos->seg_byte_pos;
-	} else {
-		*read_cnt = to_do;
-	}
-	if (copy_to_user(dst_buf, 
-			 src_buf + pos->seg_byte_pos, *read_cnt) != 0) {
-		TRACE_EXIT -EFAULT;
-	}
-	TRACE(ft_t_noise, "nr bytes just read: %d", *read_cnt);
-	TRACE_EXIT *read_cnt;
-}
-
-/* req_len: gets clipped due to EOT of EOF.
- * req_clipped: is a flag indicating whether req_len was clipped or not
- * volume: contains information on current volume (blk_sz etc.)
- */
-static int check_read_access(int *req_len, 
-			     const zft_volinfo **volume,
-			     int *req_clipped, 
-			     const zft_position *pos)
-{
-	static __s64 remaining;
-	static int eod;
-	TRACE_FUN(ft_t_flow);
-	
-	if (zft_io_state != zft_reading) {
-		if (zft_offline) { /* offline includes no_tape */
-			TRACE_ABORT(-ENXIO, ft_t_warn,
-				    "tape is offline or no cartridge");
-		}
-		if (!ft_formatted) {
-			TRACE_ABORT(-EACCES,
-				    ft_t_warn, "tape is not formatted");
-		}
-		/*  now enter defined state, read header segment if not
-		 *  already done and flush write buffers
-		 */
-		TRACE_CATCH(zft_def_idle_state(),);
-		zft_io_state = zft_reading;
-		if (zft_tape_at_eod(pos)) {
-			eod = 1;
-			TRACE_EXIT 1;
-		}
-		eod = 0;
-		*volume = zft_find_volume(pos->seg_pos);
-		/* get the space left until EOF */
-		remaining = zft_check_for_eof(*volume, pos);
-		buf_len_rd = 0;
-		TRACE(ft_t_noise, "remaining: " LL_X ", vol_no: %d",
-		      LL(remaining), (*volume)->count);
-	} else if (zft_tape_at_eod(pos)) {
-		if (++eod > 2) {
-			TRACE_EXIT -EIO; /* st.c also returns -EIO */
-		} else {
-			TRACE_EXIT 1;
-		}
-	}
-	if ((*req_len % (*volume)->blk_sz) != 0) {
-		/*  this message is informational only. The user gets the
-		 *  proper return value
-		 */
-		TRACE_ABORT(-EINVAL, ft_t_info,
-			    "req_len %d not a multiple of block size %d",
-			    *req_len, (*volume)->blk_sz);
-	}
-	/* As GNU tar doesn't accept partial read counts when the
-	 * multiple volume flag is set, we make sure to return the
-	 * requested amount of data. Except, of course, at the end of
-	 * the tape or file mark.  
-	 */
-	remaining -= *req_len;
-	if (remaining <= 0) {
-		TRACE(ft_t_noise, 
-		      "clipped request from %d to %d.", 
-		      *req_len, (int)(*req_len + remaining));
-		*req_len += remaining;
-		*req_clipped = 1;
-	} else {
-		*req_clipped = 0;
-	}
-	TRACE_EXIT 0;
-}
-
-/* this_segs_size: the current segment's size.
- * buff: the USER-SPACE buffer provided by the calling function.
- * req_len: how much data should be read at most.
- * volume: contains information on current volume (blk_sz etc.)
- */  
-static int empty_deblock_buf(__u8 __user *usr_buf, const int req_len,
-			     const __u8 *src_buf, const int seg_sz,
-			     zft_position *pos,
-			     const zft_volinfo *volume)
-{
-	int cnt;
-	int result = 0;
-	TRACE_FUN(ft_t_flow);
-
-	TRACE(ft_t_data_flow, "this_segs_size: %d", seg_sz);
-	if (zft_use_compression && volume->use_compression) {
-		TRACE_CATCH(zft_cmpr_lock(1 /* try to load */),);
-		TRACE_CATCH(result= (*zft_cmpr_ops->read)(&cnt,
-							  usr_buf, req_len,
-							  src_buf, seg_sz,
-							  pos, volume),);
-	} else {                                  
-		TRACE_CATCH(result= zft_simple_read (&cnt,
-						     usr_buf, req_len,
-						     src_buf, seg_sz,
-						     pos, volume),);
-	}
-	pos->volume_pos   += result;
-        pos->tape_pos     += cnt;
-	pos->seg_byte_pos += cnt;
-	buf_len_rd        -= cnt; /* remaining bytes in buffer */
-	TRACE(ft_t_data_flow, "buf_len_rd: %d, cnt: %d", buf_len_rd, cnt);
-	if(pos->seg_byte_pos >= seg_sz) {
-		pos->seg_pos++;
-		pos->seg_byte_pos = 0;
-	}
-	TRACE(ft_t_data_flow, "bytes moved out of deblock-buffer: %d", cnt);
-	TRACE_EXIT result;
-}
-
-
-/* note: we store the segment id of the segment that is inside the
- * deblock buffer. This spares a lot of ftape_read_segment()s when we
- * use small block-sizes. The block-size may be 1kb (SECTOR_SIZE). In
- * this case a MTFSR 28 maybe still inside the same segment.
- */
-int _zft_read(char __user *buff, int req_len)
-{
-	int req_clipped;
-	int result     = 0;
-	int bytes_read = 0;
-	static unsigned int seg_sz = 0;
-	static const zft_volinfo *volume = NULL;
-	TRACE_FUN(ft_t_flow);
-	
-	zft_resid = req_len;
-	result = check_read_access(&req_len, &volume,
-				   &req_clipped, &zft_pos);
-	switch(result) {
-	case 0: 
-		break; /* nothing special */
-	case 1: 
-		TRACE(ft_t_noise, "EOD reached");
-		TRACE_EXIT 0;   /* EOD */
-	default:
-		TRACE_ABORT(result, ft_t_noise,
-			    "check_read_access() failed with result %d",
-			    result);
-		TRACE_EXIT result;
-	}
-	while (req_len > 0) { 
-		/*  Allow escape from this loop on signal !
-		 */
-		FT_SIGNAL_EXIT(_DONT_BLOCK);
-		/* buf_len_rd == 0 means that we need to read a new
-		 * segment.
-		 */
-		if (buf_len_rd == 0) {
-			while((result = zft_fetch_segment(zft_pos.seg_pos,
-							  zft_deblock_buf,
-							  FT_RD_AHEAD)) == 0) {
-				zft_pos.seg_pos ++;
-				zft_pos.seg_byte_pos = 0;
-			}
-			if (result < 0) {
-				zft_resid -= bytes_read;
-				TRACE_ABORT(result, ft_t_noise,
-					    "zft_fetch_segment(): %d",
-					    result);
-			}
-			seg_sz = result;
-			buf_len_rd = seg_sz - zft_pos.seg_byte_pos;
-		}
-		TRACE_CATCH(result = empty_deblock_buf(buff, 
-						       req_len,
-						       zft_deblock_buf, 
-						       seg_sz, 
-						       &zft_pos,
-						       volume),
-			    zft_resid -= bytes_read);
-		TRACE(ft_t_data_flow, "bytes just read: %d", result);
-		bytes_read += result; /* what we got so far       */
-		buff       += result; /* index in user-buffer     */
-		req_len    -= result; /* what's left from req_len */
-	} /* while (req_len  > 0) */
-	if (req_clipped) {
-		TRACE(ft_t_data_flow,
-		      "maybe partial count because of eof mark");
-		if (zft_just_before_eof && bytes_read == 0) {
-			/* req_len was > 0, but user didn't get
-			 * anything the user has read in the eof-mark 
-			 */
-			zft_move_past_eof(&zft_pos);
-			ftape_abort_operation();
-		} else {
-			/* don't skip to the next file before the user
-			 * tried to read a second time past EOF Just
-			 * mark that we are at EOF and maybe decrement
-			 * zft_seg_pos to stay in the same volume;
-			 */
-			zft_just_before_eof = 1;
-			zft_position_before_eof(&zft_pos, volume);
-			TRACE(ft_t_noise, "just before eof");
-		}
-	}
-	zft_resid -= result; /* for MTSTATUS       */
-	TRACE_EXIT bytes_read;
-}