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kernel_samsung_sm7125/drivers/char/ftape/zftape/zftape-ctl.c

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/*
* 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>
#include <linux/module.h>
#include <linux/fcntl.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_write_protected; /* this is when cartridge rdonly or O_RDONLY */
int zft_header_read;
int zft_offline;
unsigned int zft_unit;
int zft_resid;
int zft_mt_compression;
/* Local vars.
*/
static int going_offline;
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;
}
/* 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 compatibility 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_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 (copy_to_user(mtftseg->mt_data,
zft_deblock_buf,
mtftseg->mt_result) != 0) {
TRACE_EXIT -EFAULT;
}
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 (copy_from_user(zft_deblock_buf,
mtftseg->mt_data,
FT_SEGMENT_SIZE) != 0) {
TRACE_EXIT -EFAULT;
}
}
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 (!capable(CAP_SYS_ADMIN)) {
TRACE_ABORT(-EPERM, ft_t_info,
"need CAP_SYS_ADMIN capability to 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 __user * 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 (copy_from_user(&krnl_arg, arg, arg_size) != 0) {
TRACE_EXIT -EFAULT;
}
}
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 (copy_to_user(arg, &krnl_arg, arg_size) != 0) {
TRACE_EXIT -EFAULT;
}
}
TRACE_EXIT result;
}