patch-2.1.66 linux/drivers/char/ftape/zftape/zftape-ctl.c
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- Lines: 1503
- Date:
Tue Nov 25 14:45:28 1997
- Orig file:
v2.1.65/linux/drivers/char/ftape/zftape/zftape-ctl.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.1.65/linux/drivers/char/ftape/zftape/zftape-ctl.c linux/drivers/char/ftape/zftape/zftape-ctl.c
@@ -0,0 +1,1502 @@
+/*
+ * 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-ctl.c,v $
+ * $Revision: 1.2.6.2 $
+ * $Date: 1997/11/14 18:07:33 $
+ *
+ * This file contains the non-read/write zftape functions
+ * for the QIC-40/80/3010/3020 floppy-tape driver for Linux.
+ */
+
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/mm.h>
+#define __NO_VERSION__
+#include <linux/module.h>
+#ifdef CONFIG_KERNELD
+#include <linux/kerneld.h>
+#endif
+#include <linux/fcntl.h>
+
+#include <linux/zftape.h>
+
+#if LINUX_VERSION_CODE >= KERNEL_VER(2,1,6)
+#include <asm/uaccess.h>
+#else
+#include <asm/segment.h>
+#endif
+
+#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_write_protected = 0; /* this is when cartridge rdonly or O_RDONLY */
+int zft_header_read = 0;
+int zft_offline = 0;
+unsigned int zft_unit = 0;
+int zft_resid = 0;
+int zft_mt_compression = 0;
+
+/* Local vars.
+ */
+static int going_offline = 0;
+
+typedef int (mt_fun)(int *argptr);
+typedef int (*mt_funp)(int *argptr);
+typedef struct
+{
+ mt_funp function;
+ unsigned offline : 1; /* op permitted if offline or no_tape */
+ unsigned write_protected : 1; /* op permitted if write-protected */
+ unsigned not_formatted : 1; /* op permitted if tape not formatted */
+ unsigned raw_mode : 1; /* op permitted if zft_mode == 0 */
+ unsigned need_idle_state : 1; /* need to call def_idle_state */
+ char *name;
+} fun_entry;
+
+static mt_fun mt_dummy, mt_reset, mt_fsr, mt_bsr, mt_rew, mt_offl, mt_nop,
+ mt_weof, mt_erase, mt_ras2, mt_setblk, mt_setdensity,
+ mt_seek, mt_tell, mt_reten, mt_eom, mt_fsf, mt_bsf,
+ mt_fsfm, mt_bsfm, mt_setdrvbuffer, mt_compression;
+
+static fun_entry mt_funs[]=
+{
+ {mt_reset , 1, 1, 1, 1, 0, "MT_RESET" }, /* 0 */
+ {mt_fsf , 0, 1, 0, 0, 1, "MT_FSF" },
+ {mt_bsf , 0, 1, 0, 0, 1, "MT_BSF" },
+ {mt_fsr , 0, 1, 0, 1, 1, "MT_FSR" },
+ {mt_bsr , 0, 1, 0, 1, 1, "MT_BSR" },
+ {mt_weof , 0, 0, 0, 0, 0, "MT_WEOF" }, /* 5 */
+ {mt_rew , 0, 1, 1, 1, 0, "MT_REW" },
+ {mt_offl , 0, 1, 1, 1, 0, "MT_OFFL" },
+ {mt_nop , 1, 1, 1, 1, 0, "MT_NOP" },
+ {mt_reten , 0, 1, 1, 1, 0, "MT_RETEN" },
+ {mt_bsfm , 0, 1, 0, 0, 1, "MT_BSFM" }, /* 10 */
+ {mt_fsfm , 0, 1, 0, 0, 1, "MT_FSFM" },
+ {mt_eom , 0, 1, 0, 0, 1, "MT_EOM" },
+ {mt_erase , 0, 0, 0, 1, 0, "MT_ERASE" },
+ {mt_dummy , 1, 1, 1, 1, 0, "MT_RAS1" },
+ {mt_ras2 , 0, 0, 0, 1, 0, "MT_RAS2" },
+ {mt_dummy , 1, 1, 1, 1, 0, "MT_RAS3" },
+ {mt_dummy , 1, 1, 1, 1, 0, "UNKNOWN" },
+ {mt_dummy , 1, 1, 1, 1, 0, "UNKNOWN" },
+ {mt_dummy , 1, 1, 1, 1, 0, "UNKNOWN" },
+ {mt_setblk , 1, 1, 1, 1, 1, "MT_SETBLK"}, /* 20 */
+ {mt_setdensity , 1, 1, 1, 1, 0, "MT_SETDENSITY"},
+ {mt_seek , 0, 1, 0, 1, 1, "MT_SEEK" },
+ {mt_dummy , 0, 1, 0, 1, 1, "MT_TELL" }, /* wr-only ?! */
+ {mt_setdrvbuffer, 1, 1, 1, 1, 0, "MT_SETDRVBUFFER" },
+ {mt_dummy , 1, 1, 1, 1, 0, "MT_FSS" }, /* 25 */
+ {mt_dummy , 1, 1, 1, 1, 0, "MT_BSS" },
+ {mt_dummy , 1, 1, 1, 1, 0, "MT_WSM" },
+ {mt_dummy , 1, 1, 1, 1, 0, "MT_LOCK" },
+ {mt_dummy , 1, 1, 1, 1, 0, "MT_UNLOCK"},
+ {mt_dummy , 1, 1, 1, 1, 0, "MT_LOAD" }, /* 30 */
+ {mt_dummy , 1, 1, 1, 1, 0, "MT_UNLOAD"},
+ {mt_compression , 1, 1, 1, 0, 1, "MT_COMPRESSION"},
+ {mt_dummy , 1, 1, 1, 1, 0, "MT_SETPART"},
+ {mt_dummy , 1, 1, 1, 1, 0, "MT_MKPART"}
+};
+
+#define NR_MT_CMDS NR_ITEMS(mt_funs)
+
+void zft_reset_position(zft_position *pos)
+{
+ TRACE_FUN(ft_t_flow);
+
+ pos->seg_byte_pos =
+ pos->volume_pos = 0;
+ if (zft_header_read) {
+ /* need to keep track of the volume table and
+ * compression map. We therefor simply
+ * position at the beginning of the first
+ * volume. This covers old ftape archives as
+ * well has various flavours of the
+ * compression map segments. The worst case is
+ * that the compression map shows up as a
+ * additional volume in front of all others.
+ */
+ pos->seg_pos = zft_find_volume(0)->start_seg;
+ pos->tape_pos = zft_calc_tape_pos(pos->seg_pos);
+ } else {
+ pos->tape_pos = 0;
+ pos->seg_pos = -1;
+ }
+ zft_just_before_eof = 0;
+ zft_deblock_segment = -1;
+ zft_io_state = zft_idle;
+ zft_zap_read_buffers();
+ zft_prevent_flush();
+ /* unlock the compresison module if it is loaded.
+ * The zero arg means not to try to load the module.
+ */
+ if (zft_cmpr_lock(0) == 0) {
+ (*zft_cmpr_ops->reset)(); /* unlock */
+ }
+ TRACE_EXIT;
+}
+
+static void zft_init_driver(void)
+{
+ TRACE_FUN(ft_t_flow);
+
+ zft_resid =
+ zft_header_read =
+ zft_old_ftape =
+ zft_offline =
+ zft_write_protected =
+ going_offline =
+ zft_mt_compression =
+ zft_header_changed =
+ zft_volume_table_changed =
+ zft_written_segments = 0;
+ zft_blk_sz = CONFIG_ZFT_DFLT_BLK_SZ;
+ zft_reset_position(&zft_pos); /* does most of the stuff */
+ ftape_zap_read_buffers();
+ ftape_set_state(idle);
+ TRACE_EXIT;
+}
+
+int zft_def_idle_state(void)
+{
+ int result = 0;
+ TRACE_FUN(ft_t_flow);
+
+ if (!zft_header_read) {
+ result = zft_read_header_segments();
+ } else if ((result = zft_flush_buffers()) >= 0 && zft_qic_mode) {
+ /* don't move past eof
+ */
+ (void)zft_close_volume(&zft_pos);
+ }
+ if (ftape_abort_operation() < 0) {
+ TRACE(ft_t_warn, "ftape_abort_operation() failed");
+ result = -EIO;
+ }
+ /* clear remaining read buffers */
+ zft_zap_read_buffers();
+ zft_io_state = zft_idle;
+ TRACE_EXIT result;
+}
+
+/*****************************************************************************
+ * *
+ * functions for the MTIOCTOP commands *
+ * *
+ *****************************************************************************/
+
+static int mt_dummy(int *dummy)
+{
+ TRACE_FUN(ft_t_flow);
+
+ TRACE_EXIT -ENOSYS;
+}
+
+static int mt_reset(int *dummy)
+{
+ TRACE_FUN(ft_t_flow);
+
+ (void)ftape_seek_to_bot();
+ TRACE_CATCH(ftape_reset_drive(),
+ zft_init_driver(); zft_uninit_mem(); zft_offline = 1);
+ /* fake a re-open of the device. This will set all flage and
+ * allocate buffers as appropriate. The new tape condition will
+ * force the open routine to do anything we need.
+ */
+ TRACE_CATCH(_zft_open(-1 /* fake reopen */, 0 /* dummy */),);
+ TRACE_EXIT 0;
+}
+
+static int mt_fsf(int *arg)
+{
+ int result;
+ TRACE_FUN(ft_t_flow);
+
+ result = zft_skip_volumes(*arg, &zft_pos);
+ zft_just_before_eof = 0;
+ TRACE_EXIT result;
+}
+
+static int mt_bsf(int *arg)
+{
+ int result = 0;
+ TRACE_FUN(ft_t_flow);
+
+ if (*arg != 0) {
+ result = zft_skip_volumes(-*arg + 1, &zft_pos);
+ }
+ TRACE_EXIT result;
+}
+
+static int seek_block(__s64 data_offset,
+ __s64 block_increment,
+ zft_position *pos)
+{
+ int result = 0;
+ __s64 new_block_pos;
+ __s64 vol_block_count;
+ const zft_volinfo *volume;
+ int exceed;
+ TRACE_FUN(ft_t_flow);
+
+ volume = zft_find_volume(pos->seg_pos);
+ if (volume->start_seg == 0 || volume->end_seg == 0) {
+ TRACE_EXIT -EIO;
+ }
+ new_block_pos = (zft_div_blksz(data_offset, volume->blk_sz)
+ + block_increment);
+ vol_block_count = zft_div_blksz(volume->size, volume->blk_sz);
+ if (new_block_pos < 0) {
+ TRACE(ft_t_noise,
+ "new_block_pos " LL_X " < 0", LL(new_block_pos));
+ zft_resid = (int)new_block_pos;
+ new_block_pos = 0;
+ exceed = 1;
+ } else if (new_block_pos > vol_block_count) {
+ TRACE(ft_t_noise,
+ "new_block_pos " LL_X " exceeds size of volume " LL_X,
+ LL(new_block_pos), LL(vol_block_count));
+ zft_resid = (int)(vol_block_count - new_block_pos);
+ new_block_pos = vol_block_count;
+ exceed = 1;
+ } else {
+ exceed = 0;
+ }
+ if (zft_use_compression && volume->use_compression) {
+ TRACE_CATCH(zft_cmpr_lock(1 /* try to load */),);
+ result = (*zft_cmpr_ops->seek)(new_block_pos, pos, volume,
+ zft_deblock_buf);
+ pos->tape_pos = zft_calc_tape_pos(pos->seg_pos);
+ pos->tape_pos += pos->seg_byte_pos;
+ } else {
+ pos->volume_pos = zft_mul_blksz(new_block_pos, volume->blk_sz);
+ pos->tape_pos = zft_calc_tape_pos(volume->start_seg);
+ pos->tape_pos += pos->volume_pos;
+ pos->seg_pos = zft_calc_seg_byte_coord(&pos->seg_byte_pos,
+ pos->tape_pos);
+ }
+ zft_just_before_eof = volume->size == pos->volume_pos;
+ if (zft_just_before_eof) {
+ /* why this? because zft_file_no checks agains start
+ * and end segment of a volume. We do not want to
+ * advance to the next volume with this function.
+ */
+ TRACE(ft_t_noise, "set zft_just_before_eof");
+ zft_position_before_eof(pos, volume);
+ }
+ TRACE(ft_t_noise, "\n"
+ KERN_INFO "new_seg_pos : %d\n"
+ KERN_INFO "new_tape_pos: " LL_X "\n"
+ KERN_INFO "vol_size : " LL_X "\n"
+ KERN_INFO "seg_byte_pos: %d\n"
+ KERN_INFO "blk_sz : %d",
+ pos->seg_pos, LL(pos->tape_pos),
+ LL(volume->size), pos->seg_byte_pos,
+ volume->blk_sz);
+ if (!exceed) {
+ zft_resid = new_block_pos - zft_div_blksz(pos->volume_pos,
+ volume->blk_sz);
+ }
+ if (zft_resid < 0) {
+ zft_resid = -zft_resid;
+ }
+ TRACE_EXIT ((exceed || zft_resid != 0) && result >= 0) ? -EINVAL : result;
+}
+
+static int mt_fsr(int *arg)
+{
+ int result;
+ TRACE_FUN(ft_t_flow);
+
+ result = seek_block(zft_pos.volume_pos, *arg, &zft_pos);
+ TRACE_EXIT result;
+}
+
+static int mt_bsr(int *arg)
+{
+ int result;
+ TRACE_FUN(ft_t_flow);
+
+ result = seek_block(zft_pos.volume_pos, -*arg, &zft_pos);
+ TRACE_EXIT result;
+}
+
+static int mt_weof(int *arg)
+{
+ int result;
+ TRACE_FUN(ft_t_flow);
+
+ TRACE_CATCH(zft_flush_buffers(),);
+ result = zft_weof(*arg, &zft_pos);
+ TRACE_EXIT result;
+}
+
+static int mt_rew(int *dummy)
+{
+ int result;
+ TRACE_FUN(ft_t_flow);
+
+ if(zft_header_read) {
+ (void)zft_def_idle_state();
+ }
+ result = ftape_seek_to_bot();
+ zft_reset_position(&zft_pos);
+ TRACE_EXIT result;
+}
+
+static int mt_offl(int *dummy)
+{
+ int result;
+ TRACE_FUN(ft_t_flow);
+
+ going_offline= 1;
+ result = mt_rew(NULL);
+ TRACE_EXIT result;
+}
+
+static int mt_nop(int *dummy)
+{
+ TRACE_FUN(ft_t_flow);
+ /* should we set tape status?
+ */
+ if (!zft_offline) { /* offline includes no_tape */
+ (void)zft_def_idle_state();
+ }
+ TRACE_EXIT 0;
+}
+
+static int mt_reten(int *dummy)
+{
+ int result;
+ TRACE_FUN(ft_t_flow);
+
+ if(zft_header_read) {
+ (void)zft_def_idle_state();
+ }
+ result = ftape_seek_to_eot();
+ if (result >= 0) {
+ result = ftape_seek_to_bot();
+ }
+ TRACE_EXIT(result);
+}
+
+static int fsfbsfm(int arg, zft_position *pos)
+{
+ const zft_volinfo *vtbl;
+ __s64 block_pos;
+ TRACE_FUN(ft_t_flow);
+
+ /* What to do? This should seek to the next file-mark and
+ * position BEFORE. That is, a next write would just extend
+ * the current file. Well. Let's just seek to the end of the
+ * current file, if count == 1. If count > 1, then do a
+ * "mt_fsf(count - 1)", and then seek to the end of that file.
+ * If count == 0, do nothing
+ */
+ if (arg == 0) {
+ TRACE_EXIT 0;
+ }
+ zft_just_before_eof = 0;
+ TRACE_CATCH(zft_skip_volumes(arg < 0 ? arg : arg-1, pos),
+ if (arg > 0) {
+ zft_resid ++;
+ });
+ vtbl = zft_find_volume(pos->seg_pos);
+ block_pos = zft_div_blksz(vtbl->size, vtbl->blk_sz);
+ (void)seek_block(0, block_pos, pos);
+ if (pos->volume_pos != vtbl->size) {
+ zft_just_before_eof = 0;
+ zft_resid = 1;
+ /* we didn't managed to go there */
+ TRACE_ABORT(-EIO, ft_t_err,
+ "wanted file position " LL_X ", arrived at " LL_X,
+ LL(vtbl->size), LL(pos->volume_pos));
+ }
+ zft_just_before_eof = 1;
+ TRACE_EXIT 0;
+}
+
+static int mt_bsfm(int *arg)
+{
+ int result;
+ TRACE_FUN(ft_t_flow);
+
+ result = fsfbsfm(-*arg, &zft_pos);
+ TRACE_EXIT result;
+}
+
+static int mt_fsfm(int *arg)
+{
+ int result;
+ TRACE_FUN(ft_t_flow);
+
+ result = fsfbsfm(*arg, &zft_pos);
+ TRACE_EXIT result;
+}
+
+static int mt_eom(int *dummy)
+{
+ TRACE_FUN(ft_t_flow);
+
+ zft_skip_to_eom(&zft_pos);
+ TRACE_EXIT 0;
+}
+
+static int mt_erase(int *dummy)
+{
+ int result;
+ TRACE_FUN(ft_t_flow);
+
+ result = zft_erase();
+ TRACE_EXIT result;
+}
+
+static int mt_ras2(int *dummy)
+{
+ int result;
+ TRACE_FUN(ft_t_flow);
+
+ result = -ENOSYS;
+ TRACE_EXIT result;
+}
+
+/* Sets the new blocksize in BYTES
+ *
+ */
+static int mt_setblk(int *new_size)
+{
+ TRACE_FUN(ft_t_flow);
+
+ if((unsigned int)(*new_size) > ZFT_MAX_BLK_SZ) {
+ TRACE_ABORT(-EINVAL, ft_t_info,
+ "desired blk_sz (%d) should be <= %d bytes",
+ *new_size, ZFT_MAX_BLK_SZ);
+ }
+ if ((*new_size & (FT_SECTOR_SIZE-1)) != 0) {
+ TRACE_ABORT(-EINVAL, ft_t_info,
+ "desired blk_sz (%d) must be a multiple of %d bytes",
+ *new_size, FT_SECTOR_SIZE);
+ }
+ if (*new_size == 0) {
+ if (zft_use_compression) {
+ TRACE_ABORT(-EINVAL, ft_t_info,
+ "Variable block size not yet "
+ "supported with compression");
+ }
+ *new_size = 1;
+ }
+ zft_blk_sz = *new_size;
+ TRACE_EXIT 0;
+}
+
+static int mt_setdensity(int *arg)
+{
+ TRACE_FUN(ft_t_flow);
+
+ SET_TRACE_LEVEL(*arg);
+ TRACE(TRACE_LEVEL, "tracing set to %d", TRACE_LEVEL);
+ if ((int)TRACE_LEVEL != *arg) {
+ TRACE_EXIT -EINVAL;
+ }
+ TRACE_EXIT 0;
+}
+
+static int mt_seek(int *new_block_pos)
+{
+ int result= 0;
+ TRACE_FUN(ft_t_any);
+
+ result = seek_block(0, (__s64)*new_block_pos, &zft_pos);
+ TRACE_EXIT result;
+}
+
+/* OK, this is totally different from SCSI, but the worst thing that can
+ * happen is that there is not enough defragmentated memory that can be
+ * allocated. Also, there is a hardwired limit of 16 dma buffers in the
+ * stock ftape module. This shouldn't bring the system down.
+ *
+ * NOTE: the argument specifies the total number of dma buffers to use.
+ * The driver needs at least 3 buffers to function at all.
+ *
+ */
+static int mt_setdrvbuffer(int *cnt)
+{
+ TRACE_FUN(ft_t_flow);
+
+ if (*cnt < 3) {
+ TRACE_EXIT -EINVAL;
+ }
+ TRACE_CATCH(ftape_set_nr_buffers(*cnt),);
+ TRACE_EXIT 0;
+}
+/* return the block position from start of volume
+ */
+static int mt_tell(int *arg)
+{
+ TRACE_FUN(ft_t_flow);
+
+ *arg = zft_div_blksz(zft_pos.volume_pos,
+ zft_find_volume(zft_pos.seg_pos)->blk_sz);
+ TRACE_EXIT 0;
+}
+
+static int mt_compression(int *arg)
+{
+ TRACE_FUN(ft_t_flow);
+
+ /* Ok. We could also check whether compression is available at
+ * all by trying to load the compression module. We could
+ * also check for a block size of 1 byte which is illegal
+ * with compression. Instead of doing it here we rely on
+ * zftape_write() to do the proper checks.
+ */
+ if ((unsigned int)*arg > 1) {
+ TRACE_EXIT -EINVAL;
+ }
+ if (*arg != 0 && zft_blk_sz == 1) { /* variable block size */
+ TRACE_ABORT(-EINVAL, ft_t_info,
+ "Compression not yet supported "
+ "with variable block size");
+ }
+ zft_mt_compression = *arg;
+ if ((zft_unit & ZFT_ZIP_MODE) == 0) {
+ zft_use_compression = zft_mt_compression;
+ }
+ TRACE_EXIT 0;
+}
+
+/* check whether write access is allowed. Write access is denied when
+ * + zft_write_protected == 1 -- this accounts for either hard write
+ * protection of the cartridge or for
+ * O_RDONLY access mode of the tape device
+ * + zft_offline == 1 -- this meany that there is either no tape
+ * or that the MTOFFLINE ioctl has been
+ * previously issued (`soft eject')
+ * + ft_formatted == 0 -- this means that the cartridge is not
+ * formatted
+ * Then we distinuguish two cases. When zft_qic_mode is TRUE, then we try
+ * to emulate a `traditional' (aka SCSI like) UN*X tape device. Therefore we
+ * deny writes when
+ * + zft_qic_mode ==1 &&
+ * (!zft_tape_at_lbot() && -- tape no at logical BOT
+ * !(zft_tape_at_eom() || -- tape not at logical EOM (or EOD)
+ * (zft_tape_at_eom() &&
+ * zft_old_ftape()))) -- we can't add new volume to tapes
+ * written by old ftape because ftape
+ * don't use the volume table
+ *
+ * when the drive is in true raw mode (aka /dev/rawft0) then we don't
+ * care about LBOT and EOM conditions. This device is intended for a
+ * user level program that wants to truly implement the QIC-80 compliance
+ * at the logical data layout level of the cartridge, i.e. implement all
+ * that volume table and volume directory stuff etc.<
+ */
+int zft_check_write_access(zft_position *pos)
+{
+ TRACE_FUN(ft_t_flow);
+
+ if (zft_offline) { /* offline includes no_tape */
+ TRACE_ABORT(-ENXIO,
+ ft_t_info, "tape is offline or no cartridge");
+ }
+ if (!ft_formatted) {
+ TRACE_ABORT(-EACCES, ft_t_info, "tape is not formatted");
+ }
+ if (zft_write_protected) {
+ TRACE_ABORT(-EACCES, ft_t_info, "cartridge write protected");
+ }
+ if (zft_qic_mode) {
+ /* check BOT condition */
+ if (!zft_tape_at_lbot(pos)) {
+ /* protect cartridges written by old ftape if
+ * not at BOT because they use the vtbl
+ * segment for storing data
+ */
+ if (zft_old_ftape) {
+ TRACE_ABORT(-EACCES, ft_t_warn,
+ "Cannot write to cartridges written by old ftape when not at BOT");
+ }
+ /* not at BOT, but allow writes at EOD, of course
+ */
+ if (!zft_tape_at_eod(pos)) {
+ TRACE_ABORT(-EACCES, ft_t_info,
+ "tape not at BOT and not at EOD");
+ }
+ }
+ /* fine. Now the tape is either at BOT or at EOD. */
+ }
+ /* or in raw mode in which case we don't care about BOT and EOD */
+ TRACE_EXIT 0;
+}
+
+/* decide when we should lock the module in memory, even when calling
+ * the release routine. This really is necessary for use with
+ * kerneld.
+ *
+ * NOTE: we MUST NOT use zft_write_protected, because this includes
+ * the file access mode as well which has no meaning with our
+ * asynchronous update scheme.
+ *
+ * Ugly, ugly. We need to look the module if we changed the block size.
+ * How sad! Need persistent modules storage!
+ *
+ * NOTE: I don't want to lock the module if the number of dma buffers
+ * has been changed. It's enough! Stop the story! Give me persisitent
+ * module storage! Do it!
+ */
+int zft_dirty(void)
+{
+ if (!ft_formatted || zft_offline) {
+ /* cannot be dirty if not formatted or offline */
+ return 0;
+ }
+ if (zft_blk_sz != CONFIG_ZFT_DFLT_BLK_SZ) {
+ /* blocksize changed, must lock */
+ return 1;
+ }
+ if (zft_mt_compression != 0) {
+ /* compression mode with /dev/qft, must lock */
+ return 1;
+ }
+ if (!zft_header_read) {
+ /* tape is logical at BOT, no lock */
+ return 0;
+ }
+ if (!zft_tape_at_lbot(&zft_pos)) {
+ /* somewhere inside a volume, lock tape */
+ return 1;
+ }
+ if (zft_volume_table_changed || zft_header_changed) {
+ /* header segments dirty if tape not write protected */
+ return !(ft_write_protected || zft_old_ftape);
+ }
+ return 0;
+}
+
+/* OPEN routine called by kernel-interface code
+ *
+ * NOTE: this is also called by mt_reset() with dev_minor == -1
+ * to fake a reopen after a reset.
+ */
+int _zft_open(unsigned int dev_minor, unsigned int access_mode)
+{
+ static unsigned int tape_unit;
+ static unsigned int file_access_mode;
+ int result;
+ TRACE_FUN(ft_t_flow);
+
+ if ((int)dev_minor == -1) {
+ /* fake reopen */
+ zft_unit = tape_unit;
+ access_mode = file_access_mode;
+ zft_init_driver(); /* reset all static data to defaults */
+ } else {
+ tape_unit = dev_minor;
+ file_access_mode = access_mode;
+ if ((result = ftape_enable(FTAPE_SEL(dev_minor))) < 0) {
+ TRACE_ABORT(-ENXIO, ft_t_err,
+ "ftape_enable failed: %d", result);
+ }
+ if (ft_new_tape || ft_no_tape || !ft_formatted ||
+ (FTAPE_SEL(zft_unit) != FTAPE_SEL(dev_minor)) ||
+ (zft_unit & ZFT_RAW_MODE) != (dev_minor & ZFT_RAW_MODE)) {
+ /* reset all static data to defaults,
+ */
+ zft_init_driver();
+ }
+ zft_unit = dev_minor;
+ }
+ zft_set_flags(zft_unit); /* decode the minor bits */
+ if (zft_blk_sz == 1 && zft_use_compression) {
+ ftape_disable(); /* resets ft_no_tape */
+ TRACE_ABORT(-ENODEV, ft_t_warn, "Variable block size not yet "
+ "supported with compression");
+ }
+ /* no need for most of the buffers when no tape or not
+ * formatted. for the read/write operations, it is the
+ * regardless whether there is no tape, a not-formatted tape
+ * or the whether the driver is soft offline.
+ * Nevertheless we allow some ioctls with non-formatted tapes,
+ * like rewind and reset.
+ */
+ if (ft_no_tape || !ft_formatted) {
+ zft_uninit_mem();
+ }
+ if (ft_no_tape) {
+ zft_offline = 1; /* so we need not test two variables */
+ }
+ if ((access_mode == O_WRONLY || access_mode == O_RDWR) &&
+ (ft_write_protected || ft_no_tape)) {
+ ftape_disable(); /* resets ft_no_tape */
+ TRACE_ABORT(ft_no_tape ? -ENXIO : -EROFS,
+ ft_t_warn, "wrong access mode %s cartridge",
+ ft_no_tape ? "without a" : "with write protected");
+ }
+ zft_write_protected = (access_mode == O_RDONLY ||
+ ft_write_protected != 0);
+ if (zft_write_protected) {
+ TRACE(ft_t_noise,
+ "read only access mode: %d, "
+ "drive write protected: %d",
+ access_mode == O_RDONLY,
+ ft_write_protected != 0);
+ }
+ if (!zft_offline) {
+ TRACE_CATCH(zft_vmalloc_once(&zft_deblock_buf,FT_SEGMENT_SIZE),
+ ftape_disable());
+ }
+ /* zft_seg_pos should be greater than the vtbl segpos but not
+ * if in compatability mode and only after we read in the
+ * header segments
+ *
+ * might also be a problem if the user makes a backup with a
+ * *qft* device and rewinds it with a raw device.
+ */
+ if (zft_qic_mode &&
+ !zft_old_ftape &&
+ zft_pos.seg_pos >= 0 &&
+ zft_header_read &&
+ zft_pos.seg_pos <= ft_first_data_segment) {
+ TRACE(ft_t_noise, "you probably mixed up the zftape devices!");
+ zft_reset_position(&zft_pos);
+ }
+ TRACE_EXIT 0;
+}
+
+/* RELEASE routine called by kernel-interface code
+ */
+int _zft_close(void)
+{
+ int result = 0;
+ TRACE_FUN(ft_t_flow);
+
+ if (zft_offline) {
+ /* call the hardware release routine. Puts the drive offline */
+ ftape_disable();
+ TRACE_EXIT 0;
+ }
+ if (!(ft_write_protected || zft_old_ftape)) {
+ result = zft_flush_buffers();
+ TRACE(ft_t_noise, "writing file mark at current position");
+ if (zft_qic_mode && zft_close_volume(&zft_pos) == 0) {
+ zft_move_past_eof(&zft_pos);
+ }
+ if ((zft_tape_at_lbot(&zft_pos) ||
+ !(zft_unit & FTAPE_NO_REWIND))) {
+ if (result >= 0) {
+ result = zft_update_header_segments();
+ } else {
+ TRACE(ft_t_err,
+ "Error: unable to update header segments");
+ }
+ }
+ }
+ ftape_abort_operation();
+ if (!(zft_unit & FTAPE_NO_REWIND)) {
+ TRACE(ft_t_noise, "rewinding tape");
+ if (ftape_seek_to_bot() < 0 && result >= 0) {
+ result = -EIO; /* keep old value */
+ }
+ zft_reset_position(&zft_pos);
+ }
+ zft_zap_read_buffers();
+ /* now free up memory as much as possible. We don't destroy
+ * the deblock buffer if it containes a valid segment.
+ */
+ if (zft_deblock_segment == -1) {
+ zft_vfree(&zft_deblock_buf, FT_SEGMENT_SIZE);
+ }
+ /* high level driver status, forces creation of a new volume
+ * when calling ftape_write again and not zft_just_before_eof
+ */
+ zft_io_state = zft_idle;
+ if (going_offline) {
+ zft_init_driver();
+ zft_uninit_mem();
+ going_offline = 0;
+ zft_offline = 1;
+ } else if (zft_dirty()) {
+ TRACE(ft_t_noise, "Keeping module locked in memory because:\n"
+ KERN_INFO "header segments need updating: %s\n"
+ KERN_INFO "tape not at BOT : %s",
+ (zft_volume_table_changed || zft_header_changed)
+ ? "yes" : "no",
+ zft_tape_at_lbot(&zft_pos) ? "no" : "yes");
+ } else if (zft_cmpr_lock(0 /* don't load */) == 0) {
+ (*zft_cmpr_ops->reset)(); /* unlock it again */
+ }
+ zft_memory_stats();
+ /* call the hardware release routine. Puts the drive offline */
+ ftape_disable();
+ TRACE_EXIT result;
+}
+
+/*
+ * the wrapper function around the wrapper MTIOCTOP ioctl
+ */
+static int mtioctop(struct mtop *mtop, int arg_size)
+{
+ int result = 0;
+ fun_entry *mt_fun_entry;
+ TRACE_FUN(ft_t_flow);
+
+ if (arg_size != sizeof(struct mtop) || mtop->mt_op >= NR_MT_CMDS) {
+ TRACE_EXIT -EINVAL;
+ }
+ TRACE(ft_t_noise, "calling MTIOCTOP command: %s",
+ mt_funs[mtop->mt_op].name);
+ mt_fun_entry= &mt_funs[mtop->mt_op];
+ zft_resid = mtop->mt_count;
+ if (!mt_fun_entry->offline && zft_offline) {
+ if (ft_no_tape) {
+ TRACE_ABORT(-ENXIO, ft_t_info, "no tape present");
+ } else {
+ TRACE_ABORT(-ENXIO, ft_t_info, "drive is offline");
+ }
+ }
+ if (!mt_fun_entry->not_formatted && !ft_formatted) {
+ TRACE_ABORT(-EACCES, ft_t_info, "tape is not formatted");
+ }
+ if (!mt_fun_entry->write_protected) {
+ TRACE_CATCH(zft_check_write_access(&zft_pos),);
+ }
+ if (mt_fun_entry->need_idle_state && !(zft_offline || !ft_formatted)) {
+ TRACE_CATCH(zft_def_idle_state(),);
+ }
+ if (!zft_qic_mode && !mt_fun_entry->raw_mode) {
+ TRACE_ABORT(-EACCES, ft_t_info,
+"Drive needs to be in QIC-80 compatibility mode for this command");
+ }
+ result = (mt_fun_entry->function)(&mtop->mt_count);
+ if (zft_tape_at_lbot(&zft_pos)) {
+ TRACE_CATCH(zft_update_header_segments(),);
+ }
+ if (result >= 0) {
+ zft_resid = 0;
+ }
+ TRACE_EXIT result;
+}
+
+/*
+ * standard MTIOCGET ioctl
+ */
+static int mtiocget(struct mtget *mtget, int arg_size)
+{
+ const zft_volinfo *volume;
+ __s64 max_tape_pos;
+ TRACE_FUN(ft_t_flow);
+
+ if (arg_size != sizeof(struct mtget)) {
+ TRACE_ABORT(-EINVAL, ft_t_info, "bad argument size: %d",
+ arg_size);
+ }
+ mtget->mt_type = ft_drive_type.vendor_id + 0x800000;
+ mtget->mt_dsreg = ft_last_status.space;
+ mtget->mt_erreg = ft_last_error.space; /* error register */
+ mtget->mt_resid = zft_resid; /* residuum of writes, reads and
+ * MTIOCTOP commands
+ */
+ if (!zft_offline) { /* neither no_tape nor soft offline */
+ mtget->mt_gstat = GMT_ONLINE(~0UL);
+ /* should rather return the status of the cartridge
+ * than the access mode of the file, therefor use
+ * ft_write_protected, not zft_write_protected
+ */
+ if (ft_write_protected) {
+ mtget->mt_gstat |= GMT_WR_PROT(~0UL);
+ }
+ if(zft_header_read) { /* this catches non-formatted */
+ volume = zft_find_volume(zft_pos.seg_pos);
+ mtget->mt_fileno = volume->count;
+ max_tape_pos = zft_capacity - zft_blk_sz;
+ if (zft_use_compression) {
+ max_tape_pos -= ZFT_CMPR_OVERHEAD;
+ }
+ if (zft_tape_at_eod(&zft_pos)) {
+ mtget->mt_gstat |= GMT_EOD(~0UL);
+ }
+ if (zft_pos.tape_pos > max_tape_pos) {
+ mtget->mt_gstat |= GMT_EOT(~0UL);
+ }
+ mtget->mt_blkno = zft_div_blksz(zft_pos.volume_pos,
+ volume->blk_sz);
+ if (zft_just_before_eof) {
+ mtget->mt_gstat |= GMT_EOF(~0UL);
+ }
+ if (zft_tape_at_lbot(&zft_pos)) {
+ mtget->mt_gstat |= GMT_BOT(~0UL);
+ }
+ } else {
+ mtget->mt_fileno = mtget->mt_blkno = -1;
+ if (mtget->mt_dsreg & QIC_STATUS_AT_BOT) {
+ mtget->mt_gstat |= GMT_BOT(~0UL);
+ }
+ }
+ } else {
+ if (ft_no_tape) {
+ mtget->mt_gstat = GMT_DR_OPEN(~0UL);
+ } else {
+ mtget->mt_gstat = 0UL;
+ }
+ mtget->mt_fileno = mtget->mt_blkno = -1;
+ }
+ TRACE_EXIT 0;
+}
+
+#ifdef MTIOCRDFTSEG
+/*
+ * Read a floppy tape segment. This is useful for manipulating the
+ * volume table, and read the old header segment before re-formatting
+ * the cartridge.
+ */
+static int mtiocrdftseg(struct mtftseg * mtftseg, int arg_size)
+{
+ TRACE_FUN(ft_t_flow);
+
+ TRACE(ft_t_noise, "Mag tape ioctl command: MTIOCRDFTSEG");
+ if (zft_qic_mode) {
+ TRACE_ABORT(-EACCES, ft_t_info,
+ "driver needs to be in raw mode for this ioctl");
+ }
+ if (arg_size != sizeof(struct mtftseg)) {
+ TRACE_ABORT(-EINVAL, ft_t_info, "bad argument size: %d",
+ arg_size);
+ }
+ if (zft_offline) {
+ TRACE_EXIT -ENXIO;
+ }
+ if (mtftseg->mt_mode != FT_RD_SINGLE &&
+ mtftseg->mt_mode != FT_RD_AHEAD) {
+ TRACE_ABORT(-EINVAL, ft_t_info, "invalid read mode");
+ }
+ if (!ft_formatted) {
+ TRACE_EXIT -EACCES; /* -ENXIO ? */
+
+ }
+ if (!zft_header_read) {
+ TRACE_CATCH(zft_def_idle_state(),);
+ }
+ if (mtftseg->mt_segno > ft_last_data_segment) {
+ TRACE_ABORT(-EINVAL, ft_t_info, "segment number is too large");
+ }
+ mtftseg->mt_result = ftape_read_segment(mtftseg->mt_segno,
+ zft_deblock_buf,
+ mtftseg->mt_mode);
+ if (mtftseg->mt_result < 0) {
+ /* a negativ result is not an ioctl error. if
+ * the user wants to read damaged tapes,
+ * it's up to her/him
+ */
+ TRACE_EXIT 0;
+ }
+#if LINUX_VERSION_CODE > KERNEL_VER(2,1,3)
+ if (copy_to_user(mtftseg->mt_data,
+ zft_deblock_buf,
+ mtftseg->mt_result) != 0) {
+ TRACE_EXIT -EFAULT;
+ }
+#else
+ TRACE_CATCH(verify_area(VERIFY_WRITE, mtftseg->mt_data,
+ mtftseg->mt_result),);
+ memcpy_tofs(mtftseg->mt_data, zft_deblock_buf,
+ mtftseg->mt_result);
+#endif
+ TRACE_EXIT 0;
+}
+#endif
+
+#ifdef MTIOCWRFTSEG
+/*
+ * write a floppy tape segment. This version features writing of
+ * deleted address marks, and gracefully ignores the (software)
+ * ft_formatted flag to support writing of header segments after
+ * formatting.
+ */
+static int mtiocwrftseg(struct mtftseg * mtftseg, int arg_size)
+{
+ int result;
+ TRACE_FUN(ft_t_flow);
+
+ TRACE(ft_t_noise, "Mag tape ioctl command: MTIOCWRFTSEG");
+ if (zft_write_protected || zft_qic_mode) {
+ TRACE_EXIT -EACCES;
+ }
+ if (arg_size != sizeof(struct mtftseg)) {
+ TRACE_ABORT(-EINVAL, ft_t_info, "bad argument size: %d",
+ arg_size);
+ }
+ if (zft_offline) {
+ TRACE_EXIT -ENXIO;
+ }
+ if (mtftseg->mt_mode != FT_WR_ASYNC &&
+ mtftseg->mt_mode != FT_WR_MULTI &&
+ mtftseg->mt_mode != FT_WR_SINGLE &&
+ mtftseg->mt_mode != FT_WR_DELETE) {
+ TRACE_ABORT(-EINVAL, ft_t_info, "invalid write mode");
+ }
+ /*
+ * We don't check for ft_formatted, because this gives
+ * only the software status of the driver.
+ *
+ * We assume that the user knows what it is
+ * doing. And rely on the low level stuff to fail
+ * when the tape isn't formatted. We only make sure
+ * that The header segment buffer is allocated,
+ * because it holds the bad sector map.
+ */
+ if (zft_hseg_buf == NULL) {
+ TRACE_EXIT -ENXIO;
+ }
+ if (mtftseg->mt_mode != FT_WR_DELETE) {
+#if LINUX_VERSION_CODE > KERNEL_VER(2,1,3)
+ if (copy_from_user(zft_deblock_buf,
+ mtftseg->mt_data,
+ FT_SEGMENT_SIZE) != 0) {
+ TRACE_EXIT -EFAULT;
+ }
+#else
+ TRACE_CATCH(verify_area(VERIFY_READ,
+ mtftseg->mt_data,
+ FT_SEGMENT_SIZE),);
+ memcpy_fromfs(zft_deblock_buf, mtftseg->mt_data,
+ FT_SEGMENT_SIZE);
+#endif
+ }
+ mtftseg->mt_result = ftape_write_segment(mtftseg->mt_segno,
+ zft_deblock_buf,
+ mtftseg->mt_mode);
+ if (mtftseg->mt_result >= 0 && mtftseg->mt_mode == FT_WR_SINGLE) {
+ /*
+ * a negativ result is not an ioctl error. if
+ * the user wants to write damaged tapes,
+ * it's up to her/him
+ */
+ if ((result = ftape_loop_until_writes_done()) < 0) {
+ mtftseg->mt_result = result;
+ }
+ }
+ TRACE_EXIT 0;
+}
+#endif
+
+#ifdef MTIOCVOLINFO
+/*
+ * get information about volume positioned at.
+ */
+static int mtiocvolinfo(struct mtvolinfo *volinfo, int arg_size)
+{
+ const zft_volinfo *volume;
+ TRACE_FUN(ft_t_flow);
+
+ TRACE(ft_t_noise, "Mag tape ioctl command: MTIOCVOLINFO");
+ if (arg_size != sizeof(struct mtvolinfo)) {
+ TRACE_ABORT(-EINVAL,
+ ft_t_info, "bad argument size: %d", arg_size);
+ }
+ if (zft_offline) {
+ TRACE_EXIT -ENXIO;
+ }
+ if (!ft_formatted) {
+ TRACE_EXIT -EACCES;
+ }
+ TRACE_CATCH(zft_def_idle_state(),);
+ volume = zft_find_volume(zft_pos.seg_pos);
+ volinfo->mt_volno = volume->count;
+ volinfo->mt_blksz = volume->blk_sz == 1 ? 0 : volume->blk_sz;
+ volinfo->mt_size = volume->size >> 10;
+ volinfo->mt_rawsize = ((zft_calc_tape_pos(volume->end_seg + 1) >> 10) -
+ (zft_calc_tape_pos(volume->start_seg) >> 10));
+ volinfo->mt_cmpr = volume->use_compression;
+ TRACE_EXIT 0;
+}
+#endif
+
+#ifdef ZFT_OBSOLETE
+static int mtioc_zftape_getblksz(struct mtblksz *blksz, int arg_size)
+{
+ TRACE_FUN(ft_t_flow);
+
+ TRACE(ft_t_noise, "\n"
+ KERN_INFO "Mag tape ioctl command: MTIOC_ZTAPE_GETBLKSZ\n"
+ KERN_INFO "This ioctl is here merely for compatibility.\n"
+ KERN_INFO "Please use MTIOCVOLINFO instead");
+ if (arg_size != sizeof(struct mtblksz)) {
+ TRACE_ABORT(-EINVAL,
+ ft_t_info, "bad argument size: %d", arg_size);
+ }
+ if (zft_offline) {
+ TRACE_EXIT -ENXIO;
+ }
+ if (!ft_formatted) {
+ TRACE_EXIT -EACCES;
+ }
+ TRACE_CATCH(zft_def_idle_state(),);
+ blksz->mt_blksz = zft_find_volume(zft_pos.seg_pos)->blk_sz;
+ TRACE_EXIT 0;
+}
+#endif
+
+#ifdef MTIOCGETSIZE
+/*
+ * get the capacity of the tape cartridge.
+ */
+static int mtiocgetsize(struct mttapesize *size, int arg_size)
+{
+ TRACE_FUN(ft_t_flow);
+
+ TRACE(ft_t_noise, "Mag tape ioctl command: MTIOC_ZFTAPE_GETSIZE");
+ if (arg_size != sizeof(struct mttapesize)) {
+ TRACE_ABORT(-EINVAL,
+ ft_t_info, "bad argument size: %d", arg_size);
+ }
+ if (zft_offline) {
+ TRACE_EXIT -ENXIO;
+ }
+ if (!ft_formatted) {
+ TRACE_EXIT -EACCES;
+ }
+ TRACE_CATCH(zft_def_idle_state(),);
+ size->mt_capacity = (unsigned int)(zft_capacity>>10);
+ size->mt_used = (unsigned int)(zft_get_eom_pos()>>10);
+ TRACE_EXIT 0;
+}
+#endif
+
+static int mtiocpos(struct mtpos *mtpos, int arg_size)
+{
+ int result;
+ TRACE_FUN(ft_t_flow);
+
+ TRACE(ft_t_noise, "Mag tape ioctl command: MTIOCPOS");
+ if (arg_size != sizeof(struct mtpos)) {
+ TRACE_ABORT(-EINVAL,
+ ft_t_info, "bad argument size: %d", arg_size);
+ }
+ result = mt_tell((int *)&mtpos->mt_blkno);
+ TRACE_EXIT result;
+}
+
+#ifdef MTIOCFTFORMAT
+/*
+ * formatting of floppy tape cartridges. This is intended to be used
+ * together with the MTIOCFTCMD ioctl and the new mmap feature
+ */
+
+/*
+ * This function uses ftape_decode_header_segment() to inform the low
+ * level ftape module about the new parameters.
+ *
+ * It erases the hseg_buf. The calling process must specify all
+ * parameters to assure proper operation.
+ *
+ * return values: -EINVAL - wrong argument size
+ * -EINVAL - if ftape_decode_header_segment() failed.
+ */
+static int set_format_parms(struct ftfmtparms *p, __u8 *hseg_buf)
+{
+ ft_trace_t old_level = TRACE_LEVEL;
+ TRACE_FUN(ft_t_flow);
+
+ TRACE(ft_t_noise, "MTIOCFTFORMAT operation FTFMT_SETPARMS");
+ memset(hseg_buf, 0, FT_SEGMENT_SIZE);
+ PUT4(hseg_buf, FT_SIGNATURE, FT_HSEG_MAGIC);
+
+ /* fill in user specified parameters
+ */
+ hseg_buf[FT_FMT_CODE] = (__u8)p->ft_fmtcode;
+ PUT2(hseg_buf, FT_SPT, p->ft_spt);
+ hseg_buf[FT_TPC] = (__u8)p->ft_tpc;
+ hseg_buf[FT_FHM] = (__u8)p->ft_fhm;
+ hseg_buf[FT_FTM] = (__u8)p->ft_ftm;
+
+ /* fill in sane defaults to make ftape happy.
+ */
+ hseg_buf[FT_FSM] = (__u8)128; /* 128 is hard wired all over ftape */
+ if (p->ft_fmtcode == fmt_big) {
+ PUT4(hseg_buf, FT_6_HSEG_1, 0);
+ PUT4(hseg_buf, FT_6_HSEG_2, 1);
+ PUT4(hseg_buf, FT_6_FRST_SEG, 2);
+ PUT4(hseg_buf, FT_6_LAST_SEG, p->ft_spt * p->ft_tpc - 1);
+ } else {
+ PUT2(hseg_buf, FT_HSEG_1, 0);
+ PUT2(hseg_buf, FT_HSEG_2, 1);
+ PUT2(hseg_buf, FT_FRST_SEG, 2);
+ PUT2(hseg_buf, FT_LAST_SEG, p->ft_spt * p->ft_tpc - 1);
+ }
+
+ /* Synchronize with the low level module. This is particularly
+ * needed for unformatted cartridges as the QIC std was previously
+ * unknown BUT is needed to set data rate and to calculate timeouts.
+ */
+ TRACE_CATCH(ftape_calibrate_data_rate(p->ft_qicstd&QIC_TAPE_STD_MASK),
+ _res = -EINVAL);
+
+ /* The following will also recalcualte the timeouts for the tape
+ * length and QIC std we want to format to.
+ * abort with -EINVAL rather than -EIO
+ */
+ SET_TRACE_LEVEL(ft_t_warn);
+ TRACE_CATCH(ftape_decode_header_segment(hseg_buf),
+ SET_TRACE_LEVEL(old_level); _res = -EINVAL);
+ SET_TRACE_LEVEL(old_level);
+ TRACE_EXIT 0;
+}
+
+/*
+ * Return the internal SOFTWARE status of the kernel driver. This does
+ * NOT query the tape drive about its status.
+ */
+static int get_format_parms(struct ftfmtparms *p, __u8 *hseg_buffer)
+{
+ TRACE_FUN(ft_t_flow);
+
+ TRACE(ft_t_noise, "MTIOCFTFORMAT operation FTFMT_GETPARMS");
+ p->ft_qicstd = ft_qic_std;
+ p->ft_fmtcode = ft_format_code;
+ p->ft_fhm = hseg_buffer[FT_FHM];
+ p->ft_ftm = hseg_buffer[FT_FTM];
+ p->ft_spt = ft_segments_per_track;
+ p->ft_tpc = ft_tracks_per_tape;
+ TRACE_EXIT 0;
+}
+
+static int mtiocftformat(struct mtftformat *mtftformat, int arg_size)
+{
+ int result;
+ union fmt_arg *arg = &mtftformat->fmt_arg;
+ TRACE_FUN(ft_t_flow);
+
+ TRACE(ft_t_noise, "Mag tape ioctl command: MTIOCFTFORMAT");
+ if (zft_offline) {
+ if (ft_no_tape) {
+ TRACE_ABORT(-ENXIO, ft_t_info, "no tape present");
+ } else {
+ TRACE_ABORT(-ENXIO, ft_t_info, "drive is offline");
+ }
+ }
+ if (zft_qic_mode) {
+ TRACE_ABORT(-EACCES, ft_t_info,
+ "driver needs to be in raw mode for this ioctl");
+ }
+ if (zft_hseg_buf == NULL) {
+ TRACE_CATCH(zft_vcalloc_once(&zft_hseg_buf, FT_SEGMENT_SIZE),);
+ }
+ zft_header_read = 0;
+ switch(mtftformat->fmt_op) {
+ case FTFMT_SET_PARMS:
+ TRACE_CATCH(set_format_parms(&arg->fmt_parms, zft_hseg_buf),);
+ TRACE_EXIT 0;
+ case FTFMT_GET_PARMS:
+ TRACE_CATCH(get_format_parms(&arg->fmt_parms, zft_hseg_buf),);
+ TRACE_EXIT 0;
+ case FTFMT_FORMAT_TRACK:
+ if ((ft_formatted && zft_check_write_access(&zft_pos) < 0) ||
+ (!ft_formatted && zft_write_protected)) {
+ TRACE_ABORT(-EACCES, ft_t_info, "Write access denied");
+ }
+ TRACE_CATCH(ftape_format_track(arg->fmt_track.ft_track,
+ arg->fmt_track.ft_gap3),);
+ TRACE_EXIT 0;
+ case FTFMT_STATUS:
+ TRACE_CATCH(ftape_format_status(&arg->fmt_status.ft_segment),);
+ TRACE_EXIT 0;
+ case FTFMT_VERIFY:
+ TRACE_CATCH(ftape_verify_segment(arg->fmt_verify.ft_segment,
+ (SectorMap *)&arg->fmt_verify.ft_bsm),);
+ TRACE_EXIT 0;
+ default:
+ TRACE_ABORT(-EINVAL, ft_t_err, "Invalid format operation");
+ }
+ TRACE_EXIT result;
+}
+#endif
+
+#ifdef MTIOCFTCMD
+/*
+ * send a QIC-117 command to the drive, with optional timeouts,
+ * parameter and result bits. This is intended to be used together
+ * with the formatting ioctl.
+ */
+static int mtiocftcmd(struct mtftcmd *ftcmd, int arg_size)
+{
+ int i;
+ TRACE_FUN(ft_t_flow);
+
+ TRACE(ft_t_noise, "Mag tape ioctl command: MTIOCFTCMD");
+ if (!suser()) {
+ TRACE_ABORT(-EPERM, ft_t_info,
+ "only the superuser may send raw qic-117 commands");
+ }
+ if (zft_qic_mode) {
+ TRACE_ABORT(-EACCES, ft_t_info,
+ "driver needs to be in raw mode for this ioctl");
+ }
+ if (arg_size != sizeof(struct mtftcmd)) {
+ TRACE_ABORT(-EINVAL,
+ ft_t_info, "bad argument size: %d", arg_size);
+ }
+ if (ftcmd->ft_wait_before) {
+ TRACE_CATCH(ftape_ready_wait(ftcmd->ft_wait_before,
+ &ftcmd->ft_status),);
+ }
+ if (ftcmd->ft_status & QIC_STATUS_ERROR)
+ goto ftmtcmd_error;
+ if (ftcmd->ft_result_bits != 0) {
+ TRACE_CATCH(ftape_report_operation(&ftcmd->ft_result,
+ ftcmd->ft_cmd,
+ ftcmd->ft_result_bits),);
+ } else {
+ TRACE_CATCH(ftape_command(ftcmd->ft_cmd),);
+ if (ftcmd->ft_status & QIC_STATUS_ERROR)
+ goto ftmtcmd_error;
+ for (i = 0; i < ftcmd->ft_parm_cnt; i++) {
+ TRACE_CATCH(ftape_parameter(ftcmd->ft_parms[i]&0x0f),);
+ if (ftcmd->ft_status & QIC_STATUS_ERROR)
+ goto ftmtcmd_error;
+ }
+ }
+ if (ftcmd->ft_wait_after != 0) {
+ TRACE_CATCH(ftape_ready_wait(ftcmd->ft_wait_after,
+ &ftcmd->ft_status),);
+ }
+ftmtcmd_error:
+ if (ftcmd->ft_status & QIC_STATUS_ERROR) {
+ TRACE(ft_t_noise, "error status set");
+ TRACE_CATCH(ftape_report_error(&ftcmd->ft_error,
+ &ftcmd->ft_cmd, 1),);
+ }
+ TRACE_EXIT 0; /* this is not an i/o error */
+}
+#endif
+
+/* IOCTL routine called by kernel-interface code
+ */
+int _zft_ioctl(unsigned int command, void * arg)
+{
+ int result;
+ union { struct mtop mtop;
+ struct mtget mtget;
+ struct mtpos mtpos;
+#ifdef MTIOCRDFTSEG
+ struct mtftseg mtftseg;
+#endif
+#ifdef MTIOCVOLINFO
+ struct mtvolinfo mtvolinfo;
+#endif
+#ifdef MTIOCGETSIZE
+ struct mttapesize mttapesize;
+#endif
+#ifdef MTIOCFTFORMAT
+ struct mtftformat mtftformat;
+#endif
+#ifdef ZFT_OBSOLETE
+ struct mtblksz mtblksz;
+#endif
+#ifdef MTIOCFTCMD
+ struct mtftcmd mtftcmd;
+#endif
+ } krnl_arg;
+ int arg_size = _IOC_SIZE(command);
+ int dir = _IOC_DIR(command);
+ TRACE_FUN(ft_t_flow);
+
+ /* This check will only catch arguments that are too large !
+ */
+ if (dir & (_IOC_READ | _IOC_WRITE) && arg_size > sizeof(krnl_arg)) {
+ TRACE_ABORT(-EINVAL,
+ ft_t_info, "bad argument size: %d", arg_size);
+ }
+ if (dir & _IOC_WRITE) {
+#if LINUX_VERSION_CODE > KERNEL_VER(2,1,3)
+ if (copy_from_user(&krnl_arg, arg, arg_size) != 0) {
+ TRACE_EXIT -EFAULT;
+ }
+#else
+ TRACE_CATCH(verify_area(VERIFY_READ, arg, arg_size),);
+ memcpy_fromfs(&krnl_arg, arg, arg_size);
+#endif
+ }
+ TRACE(ft_t_flow, "called with ioctl command: 0x%08x", command);
+ switch (command) {
+ case MTIOCTOP:
+ result = mtioctop(&krnl_arg.mtop, arg_size);
+ break;
+ case MTIOCGET:
+ result = mtiocget(&krnl_arg.mtget, arg_size);
+ break;
+ case MTIOCPOS:
+ result = mtiocpos(&krnl_arg.mtpos, arg_size);
+ break;
+#ifdef MTIOCVOLINFO
+ case MTIOCVOLINFO:
+ result = mtiocvolinfo(&krnl_arg.mtvolinfo, arg_size);
+ break;
+#endif
+#ifdef ZFT_OBSOLETE
+ case MTIOC_ZFTAPE_GETBLKSZ:
+ result = mtioc_zftape_getblksz(&krnl_arg.mtblksz, arg_size);
+ break;
+#endif
+#ifdef MTIOCRDFTSEG
+ case MTIOCRDFTSEG: /* read a segment via ioctl */
+ result = mtiocrdftseg(&krnl_arg.mtftseg, arg_size);
+ break;
+#endif
+#ifdef MTIOCWRFTSEG
+ case MTIOCWRFTSEG: /* write a segment via ioctl */
+ result = mtiocwrftseg(&krnl_arg.mtftseg, arg_size);
+ break;
+#endif
+#ifdef MTIOCGETSIZE
+ case MTIOCGETSIZE:
+ result = mtiocgetsize(&krnl_arg.mttapesize, arg_size);
+ break;
+#endif
+#ifdef MTIOCFTFORMAT
+ case MTIOCFTFORMAT:
+ result = mtiocftformat(&krnl_arg.mtftformat, arg_size);
+ break;
+#endif
+#ifdef MTIOCFTCMD
+ case MTIOCFTCMD:
+ result = mtiocftcmd(&krnl_arg.mtftcmd, arg_size);
+ break;
+#endif
+ default:
+ result = -EINVAL;
+ break;
+ }
+ if ((result >= 0) && (dir & _IOC_READ)) {
+#if LINUX_VERSION_CODE > KERNEL_VER(2,1,3)
+ if (copy_to_user(arg, &krnl_arg, arg_size) != 0) {
+ TRACE_EXIT -EFAULT;
+ }
+#else
+ TRACE_CATCH(verify_area(VERIFY_WRITE, arg, arg_size),);
+ memcpy_tofs(arg, &krnl_arg, arg_size);
+#endif
+ }
+ TRACE_EXIT result;
+}
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen, slshen@lbl.gov