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linux_dsm_epyc7002/drivers/ide/ide-tape.c
Tejun Heo 36999a5af1 ide-tape: remove back-to-back REQUEST_SENSE detection 
Impact: fix an oops which always triggers

ide_tape_issue_pc() assumed drive->pc isn't NULL on invocation when
checking for back-to-back request sense issues but drive->pc can be
NULL and even when it's not NULL, it's not safe to dereference it once
the previous command is complete because pc could have been freed or
was on stack.  Kill back-to-back REQUEST_SENSE detection.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
2009-05-16 19:03:18 +02:00

2466 lines
66 KiB
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/*
* IDE ATAPI streaming tape driver.
*
* Copyright (C) 1995-1999 Gadi Oxman <gadio@netvision.net.il>
* Copyright (C) 2003-2005 Bartlomiej Zolnierkiewicz
*
* This driver was constructed as a student project in the software laboratory
* of the faculty of electrical engineering in the Technion - Israel's
* Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David.
*
* It is hereby placed under the terms of the GNU general public license.
* (See linux/COPYING).
*
* For a historical changelog see
* Documentation/ide/ChangeLog.ide-tape.1995-2002
*/
#define DRV_NAME "ide-tape"
#define IDETAPE_VERSION "1.20"
#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/jiffies.h>
#include <linux/major.h>
#include <linux/errno.h>
#include <linux/genhd.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/ide.h>
#include <linux/smp_lock.h>
#include <linux/completion.h>
#include <linux/bitops.h>
#include <linux/mutex.h>
#include <scsi/scsi.h>
#include <asm/byteorder.h>
#include <linux/irq.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include <asm/unaligned.h>
#include <linux/mtio.h>
enum {
/* output errors only */
DBG_ERR = (1 << 0),
/* output all sense key/asc */
DBG_SENSE = (1 << 1),
/* info regarding all chrdev-related procedures */
DBG_CHRDEV = (1 << 2),
/* all remaining procedures */
DBG_PROCS = (1 << 3),
};
/* define to see debug info */
#define IDETAPE_DEBUG_LOG 0
#if IDETAPE_DEBUG_LOG
#define debug_log(lvl, fmt, args...) \
{ \
if (tape->debug_mask & lvl) \
printk(KERN_INFO "ide-tape: " fmt, ## args); \
}
#else
#define debug_log(lvl, fmt, args...) do {} while (0)
#endif
/**************************** Tunable parameters *****************************/
/*
* After each failed packet command we issue a request sense command and retry
* the packet command IDETAPE_MAX_PC_RETRIES times.
*
* Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries.
*/
#define IDETAPE_MAX_PC_RETRIES 3
/*
* The following parameter is used to select the point in the internal tape fifo
* in which we will start to refill the buffer. Decreasing the following
* parameter will improve the system's latency and interactive response, while
* using a high value might improve system throughput.
*/
#define IDETAPE_FIFO_THRESHOLD 2
/*
* DSC polling parameters.
*
* Polling for DSC (a single bit in the status register) is a very important
* function in ide-tape. There are two cases in which we poll for DSC:
*
* 1. Before a read/write packet command, to ensure that we can transfer data
* from/to the tape's data buffers, without causing an actual media access.
* In case the tape is not ready yet, we take out our request from the device
* request queue, so that ide.c could service requests from the other device
* on the same interface in the meantime.
*
* 2. After the successful initialization of a "media access packet command",
* which is a command that can take a long time to complete (the interval can
* range from several seconds to even an hour). Again, we postpone our request
* in the middle to free the bus for the other device. The polling frequency
* here should be lower than the read/write frequency since those media access
* commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST
* (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD
* (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min).
*
* We also set a timeout for the timer, in case something goes wrong. The
* timeout should be longer then the maximum execution time of a tape operation.
*/
/* DSC timings. */
#define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */
#define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */
#define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */
#define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */
#define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */
#define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */
#define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */
/*************************** End of tunable parameters ***********************/
/* tape directions */
enum {
IDETAPE_DIR_NONE = (1 << 0),
IDETAPE_DIR_READ = (1 << 1),
IDETAPE_DIR_WRITE = (1 << 2),
};
struct idetape_bh {
u32 b_size;
atomic_t b_count;
struct idetape_bh *b_reqnext;
char *b_data;
};
/* Tape door status */
#define DOOR_UNLOCKED 0
#define DOOR_LOCKED 1
#define DOOR_EXPLICITLY_LOCKED 2
/* Some defines for the SPACE command */
#define IDETAPE_SPACE_OVER_FILEMARK 1
#define IDETAPE_SPACE_TO_EOD 3
/* Some defines for the LOAD UNLOAD command */
#define IDETAPE_LU_LOAD_MASK 1
#define IDETAPE_LU_RETENSION_MASK 2
#define IDETAPE_LU_EOT_MASK 4
/* Structures related to the SELECT SENSE / MODE SENSE packet commands. */
#define IDETAPE_BLOCK_DESCRIPTOR 0
#define IDETAPE_CAPABILITIES_PAGE 0x2a
/*
* Most of our global data which we need to save even as we leave the driver due
* to an interrupt or a timer event is stored in the struct defined below.
*/
typedef struct ide_tape_obj {
ide_drive_t *drive;
struct ide_driver *driver;
struct gendisk *disk;
struct device dev;
/* used by REQ_IDETAPE_{READ,WRITE} requests */
struct ide_atapi_pc queued_pc;
/*
* DSC polling variables.
*
* While polling for DSC we use postponed_rq to postpone the current
* request so that ide.c will be able to service pending requests on the
* other device. Note that at most we will have only one DSC (usually
* data transfer) request in the device request queue.
*/
struct request *postponed_rq;
/* The time in which we started polling for DSC */
unsigned long dsc_polling_start;
/* Timer used to poll for dsc */
struct timer_list dsc_timer;
/* Read/Write dsc polling frequency */
unsigned long best_dsc_rw_freq;
unsigned long dsc_poll_freq;
unsigned long dsc_timeout;
/* Read position information */
u8 partition;
/* Current block */
unsigned int first_frame;
/* Last error information */
u8 sense_key, asc, ascq;
/* Character device operation */
unsigned int minor;
/* device name */
char name[4];
/* Current character device data transfer direction */
u8 chrdev_dir;
/* tape block size, usually 512 or 1024 bytes */
unsigned short blk_size;
int user_bs_factor;
/* Copy of the tape's Capabilities and Mechanical Page */
u8 caps[20];
/*
* Active data transfer request parameters.
*
* At most, there is only one ide-tape originated data transfer request
* in the device request queue. This allows ide.c to easily service
* requests from the other device when we postpone our active request.
*/
/* Data buffer size chosen based on the tape's recommendation */
int buffer_size;
/* merge buffer */
struct idetape_bh *merge_bh;
/* size of the merge buffer */
int merge_bh_size;
/* pointer to current buffer head within the merge buffer */
struct idetape_bh *bh;
char *b_data;
int b_count;
int pages_per_buffer;
/* Wasted space in each stage */
int excess_bh_size;
/* Measures average tape speed */
unsigned long avg_time;
int avg_size;
int avg_speed;
/* the door is currently locked */
int door_locked;
/* the tape hardware is write protected */
char drv_write_prot;
/* the tape is write protected (hardware or opened as read-only) */
char write_prot;
u32 debug_mask;
} idetape_tape_t;
static DEFINE_MUTEX(idetape_ref_mutex);
static struct class *idetape_sysfs_class;
static void ide_tape_release(struct device *);
static struct ide_tape_obj *ide_tape_get(struct gendisk *disk)
{
struct ide_tape_obj *tape = NULL;
mutex_lock(&idetape_ref_mutex);
tape = ide_drv_g(disk, ide_tape_obj);
if (tape) {
if (ide_device_get(tape->drive))
tape = NULL;
else
get_device(&tape->dev);
}
mutex_unlock(&idetape_ref_mutex);
return tape;
}
static void ide_tape_put(struct ide_tape_obj *tape)
{
ide_drive_t *drive = tape->drive;
mutex_lock(&idetape_ref_mutex);
put_device(&tape->dev);
ide_device_put(drive);
mutex_unlock(&idetape_ref_mutex);
}
/*
* The variables below are used for the character device interface. Additional
* state variables are defined in our ide_drive_t structure.
*/
static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES];
static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i)
{
struct ide_tape_obj *tape = NULL;
mutex_lock(&idetape_ref_mutex);
tape = idetape_devs[i];
if (tape)
get_device(&tape->dev);
mutex_unlock(&idetape_ref_mutex);
return tape;
}
static int idetape_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
unsigned int bcount)
{
struct idetape_bh *bh = pc->bh;
int count;
while (bcount) {
if (bh == NULL)
break;
count = min(
(unsigned int)(bh->b_size - atomic_read(&bh->b_count)),
bcount);
drive->hwif->tp_ops->input_data(drive, NULL, bh->b_data +
atomic_read(&bh->b_count), count);
bcount -= count;
atomic_add(count, &bh->b_count);
if (atomic_read(&bh->b_count) == bh->b_size) {
bh = bh->b_reqnext;
if (bh)
atomic_set(&bh->b_count, 0);
}
}
pc->bh = bh;
return bcount;
}
static int idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
unsigned int bcount)
{
struct idetape_bh *bh = pc->bh;
int count;
while (bcount) {
if (bh == NULL)
break;
count = min((unsigned int)pc->b_count, (unsigned int)bcount);
drive->hwif->tp_ops->output_data(drive, NULL, pc->b_data, count);
bcount -= count;
pc->b_data += count;
pc->b_count -= count;
if (!pc->b_count) {
bh = bh->b_reqnext;
pc->bh = bh;
if (bh) {
pc->b_data = bh->b_data;
pc->b_count = atomic_read(&bh->b_count);
}
}
}
return bcount;
}
static void idetape_update_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc)
{
struct idetape_bh *bh = pc->bh;
int count;
unsigned int bcount = pc->xferred;
if (pc->flags & PC_FLAG_WRITING)
return;
while (bcount) {
if (bh == NULL) {
printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
__func__);
return;
}
count = min((unsigned int)bh->b_size, (unsigned int)bcount);
atomic_set(&bh->b_count, count);
if (atomic_read(&bh->b_count) == bh->b_size)
bh = bh->b_reqnext;
bcount -= count;
}
pc->bh = bh;
}
/*
* called on each failed packet command retry to analyze the request sense. We
* currently do not utilize this information.
*/
static void idetape_analyze_error(ide_drive_t *drive, u8 *sense)
{
idetape_tape_t *tape = drive->driver_data;
struct ide_atapi_pc *pc = drive->failed_pc;
tape->sense_key = sense[2] & 0xF;
tape->asc = sense[12];
tape->ascq = sense[13];
debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n",
pc->c[0], tape->sense_key, tape->asc, tape->ascq);
/* Correct pc->xferred by asking the tape. */
if (pc->flags & PC_FLAG_DMA_ERROR) {
pc->xferred = pc->req_xfer -
tape->blk_size *
get_unaligned_be32(&sense[3]);
idetape_update_buffers(drive, pc);
}
/*
* If error was the result of a zero-length read or write command,
* with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
* (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
*/
if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6)
/* length == 0 */
&& pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) {
if (tape->sense_key == 5) {
/* don't report an error, everything's ok */
pc->error = 0;
/* don't retry read/write */
pc->flags |= PC_FLAG_ABORT;
}
}
if (pc->c[0] == READ_6 && (sense[2] & 0x80)) {
pc->error = IDE_DRV_ERROR_FILEMARK;
pc->flags |= PC_FLAG_ABORT;
}
if (pc->c[0] == WRITE_6) {
if ((sense[2] & 0x40) || (tape->sense_key == 0xd
&& tape->asc == 0x0 && tape->ascq == 0x2)) {
pc->error = IDE_DRV_ERROR_EOD;
pc->flags |= PC_FLAG_ABORT;
}
}
if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
if (tape->sense_key == 8) {
pc->error = IDE_DRV_ERROR_EOD;
pc->flags |= PC_FLAG_ABORT;
}
if (!(pc->flags & PC_FLAG_ABORT) &&
pc->xferred)
pc->retries = IDETAPE_MAX_PC_RETRIES + 1;
}
}
/* Free data buffers completely. */
static void ide_tape_kfree_buffer(idetape_tape_t *tape)
{
struct idetape_bh *prev_bh, *bh = tape->merge_bh;
while (bh) {
u32 size = bh->b_size;
while (size) {
unsigned int order = fls(size >> PAGE_SHIFT)-1;
if (bh->b_data)
free_pages((unsigned long)bh->b_data, order);
size &= (order-1);
bh->b_data += (1 << order) * PAGE_SIZE;
}
prev_bh = bh;
bh = bh->b_reqnext;
kfree(prev_bh);
}
}
static void ide_tape_handle_dsc(ide_drive_t *);
static int ide_tape_callback(ide_drive_t *drive, int dsc)
{
idetape_tape_t *tape = drive->driver_data;
struct ide_atapi_pc *pc = drive->pc;
struct request *rq = drive->hwif->rq;
int uptodate = pc->error ? 0 : 1;
int err = uptodate ? 0 : IDE_DRV_ERROR_GENERAL;
debug_log(DBG_PROCS, "Enter %s\n", __func__);
if (dsc)
ide_tape_handle_dsc(drive);
if (drive->failed_pc == pc)
drive->failed_pc = NULL;
if (pc->c[0] == REQUEST_SENSE) {
if (uptodate)
idetape_analyze_error(drive, pc->buf);
else
printk(KERN_ERR "ide-tape: Error in REQUEST SENSE "
"itself - Aborting request!\n");
} else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
int blocks = pc->xferred / tape->blk_size;
tape->avg_size += blocks * tape->blk_size;
if (time_after_eq(jiffies, tape->avg_time + HZ)) {
tape->avg_speed = tape->avg_size * HZ /
(jiffies - tape->avg_time) / 1024;
tape->avg_size = 0;
tape->avg_time = jiffies;
}
tape->first_frame += blocks;
rq->current_nr_sectors -= blocks;
if (pc->error) {
uptodate = 0;
err = pc->error;
}
} else if (pc->c[0] == READ_POSITION && uptodate) {
u8 *readpos = pc->buf;
debug_log(DBG_SENSE, "BOP - %s\n",
(readpos[0] & 0x80) ? "Yes" : "No");
debug_log(DBG_SENSE, "EOP - %s\n",
(readpos[0] & 0x40) ? "Yes" : "No");
if (readpos[0] & 0x4) {
printk(KERN_INFO "ide-tape: Block location is unknown"
"to the tape\n");
clear_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags);
uptodate = 0;
err = IDE_DRV_ERROR_GENERAL;
} else {
debug_log(DBG_SENSE, "Block Location - %u\n",
be32_to_cpup((__be32 *)&readpos[4]));
tape->partition = readpos[1];
tape->first_frame = be32_to_cpup((__be32 *)&readpos[4]);
set_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags);
}
}
rq->errors = err;
return uptodate;
}
/*
* Postpone the current request so that ide.c will be able to service requests
* from another device on the same port while we are polling for DSC.
*/
static void idetape_postpone_request(ide_drive_t *drive)
{
idetape_tape_t *tape = drive->driver_data;
debug_log(DBG_PROCS, "Enter %s\n", __func__);
tape->postponed_rq = drive->hwif->rq;
ide_stall_queue(drive, tape->dsc_poll_freq);
}
static void ide_tape_handle_dsc(ide_drive_t *drive)
{
idetape_tape_t *tape = drive->driver_data;
/* Media access command */
tape->dsc_polling_start = jiffies;
tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST;
tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT;
/* Allow ide.c to handle other requests */
idetape_postpone_request(drive);
}
static int ide_tape_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
unsigned int bcount, int write)
{
unsigned int bleft;
if (write)
bleft = idetape_output_buffers(drive, pc, bcount);
else
bleft = idetape_input_buffers(drive, pc, bcount);
return bcount - bleft;
}
/*
* Packet Command Interface
*
* The current Packet Command is available in drive->pc, and will not change
* until we finish handling it. Each packet command is associated with a
* callback function that will be called when the command is finished.
*
* The handling will be done in three stages:
*
* 1. ide_tape_issue_pc will send the packet command to the drive, and will set
* the interrupt handler to ide_pc_intr.
*
* 2. On each interrupt, ide_pc_intr will be called. This step will be
* repeated until the device signals us that no more interrupts will be issued.
*
* 3. ATAPI Tape media access commands have immediate status with a delayed
* process. In case of a successful initiation of a media access packet command,
* the DSC bit will be set when the actual execution of the command is finished.
* Since the tape drive will not issue an interrupt, we have to poll for this
* event. In this case, we define the request as "low priority request" by
* setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and
* exit the driver.
*
* ide.c will then give higher priority to requests which originate from the
* other device, until will change rq_status to RQ_ACTIVE.
*
* 4. When the packet command is finished, it will be checked for errors.
*
* 5. In case an error was found, we queue a request sense packet command in
* front of the request queue and retry the operation up to
* IDETAPE_MAX_PC_RETRIES times.
*
* 6. In case no error was found, or we decided to give up and not to retry
* again, the callback function will be called and then we will handle the next
* request.
*/
static ide_startstop_t ide_tape_issue_pc(ide_drive_t *drive,
struct ide_cmd *cmd,
struct ide_atapi_pc *pc)
{
idetape_tape_t *tape = drive->driver_data;
if (drive->failed_pc == NULL && pc->c[0] != REQUEST_SENSE)
drive->failed_pc = pc;
/* Set the current packet command */
drive->pc = pc;
if (pc->retries > IDETAPE_MAX_PC_RETRIES ||
(pc->flags & PC_FLAG_ABORT)) {
/*
* We will "abort" retrying a packet command in case legitimate
* error code was received (crossing a filemark, or end of the
* media, for example).
*/
if (!(pc->flags & PC_FLAG_ABORT)) {
if (!(pc->c[0] == TEST_UNIT_READY &&
tape->sense_key == 2 && tape->asc == 4 &&
(tape->ascq == 1 || tape->ascq == 8))) {
printk(KERN_ERR "ide-tape: %s: I/O error, "
"pc = %2x, key = %2x, "
"asc = %2x, ascq = %2x\n",
tape->name, pc->c[0],
tape->sense_key, tape->asc,
tape->ascq);
}
/* Giving up */
pc->error = IDE_DRV_ERROR_GENERAL;
}
drive->failed_pc = NULL;
drive->pc_callback(drive, 0);
return ide_stopped;
}
debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]);
pc->retries++;
return ide_issue_pc(drive, cmd);
}
/* A mode sense command is used to "sense" tape parameters. */
static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code)
{
ide_init_pc(pc);
pc->c[0] = MODE_SENSE;
if (page_code != IDETAPE_BLOCK_DESCRIPTOR)
/* DBD = 1 - Don't return block descriptors */
pc->c[1] = 8;
pc->c[2] = page_code;
/*
* Changed pc->c[3] to 0 (255 will at best return unused info).
*
* For SCSI this byte is defined as subpage instead of high byte
* of length and some IDE drives seem to interpret it this way
* and return an error when 255 is used.
*/
pc->c[3] = 0;
/* We will just discard data in that case */
pc->c[4] = 255;
if (page_code == IDETAPE_BLOCK_DESCRIPTOR)
pc->req_xfer = 12;
else if (page_code == IDETAPE_CAPABILITIES_PAGE)
pc->req_xfer = 24;
else
pc->req_xfer = 50;
}
static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive)
{
ide_hwif_t *hwif = drive->hwif;
idetape_tape_t *tape = drive->driver_data;
struct ide_atapi_pc *pc = drive->pc;
u8 stat;
stat = hwif->tp_ops->read_status(hwif);
if (stat & ATA_DSC) {
if (stat & ATA_ERR) {
/* Error detected */
if (pc->c[0] != TEST_UNIT_READY)
printk(KERN_ERR "ide-tape: %s: I/O error, ",
tape->name);
/* Retry operation */
ide_retry_pc(drive, tape->disk);
return ide_stopped;
}
pc->error = 0;
} else {
pc->error = IDE_DRV_ERROR_GENERAL;
drive->failed_pc = NULL;
}
drive->pc_callback(drive, 0);
return ide_stopped;
}
static void ide_tape_create_rw_cmd(idetape_tape_t *tape,
struct ide_atapi_pc *pc, struct request *rq,
u8 opcode)
{
struct idetape_bh *bh = (struct idetape_bh *)rq->special;
unsigned int length = rq->current_nr_sectors;
ide_init_pc(pc);
put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
pc->c[1] = 1;
pc->bh = bh;
pc->buf = NULL;
pc->buf_size = length * tape->blk_size;
pc->req_xfer = pc->buf_size;
if (pc->req_xfer == tape->buffer_size)
pc->flags |= PC_FLAG_DMA_OK;
if (opcode == READ_6) {
pc->c[0] = READ_6;
atomic_set(&bh->b_count, 0);
} else if (opcode == WRITE_6) {
pc->c[0] = WRITE_6;
pc->flags |= PC_FLAG_WRITING;
pc->b_data = bh->b_data;
pc->b_count = atomic_read(&bh->b_count);
}
memcpy(rq->cmd, pc->c, 12);
}
static ide_startstop_t idetape_do_request(ide_drive_t *drive,
struct request *rq, sector_t block)
{
ide_hwif_t *hwif = drive->hwif;
idetape_tape_t *tape = drive->driver_data;
struct ide_atapi_pc *pc = NULL;
struct request *postponed_rq = tape->postponed_rq;
struct ide_cmd cmd;
u8 stat;
debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %lu,"
" current_nr_sectors: %u\n",
(unsigned long long)rq->sector, rq->nr_sectors,
rq->current_nr_sectors);
if (!blk_special_request(rq)) {
/* We do not support buffer cache originated requests. */
printk(KERN_NOTICE "ide-tape: %s: Unsupported request in "
"request queue (%d)\n", drive->name, rq->cmd_type);
if (blk_fs_request(rq) == 0 && rq->errors == 0)
rq->errors = -EIO;
ide_complete_rq(drive, -EIO, ide_rq_bytes(rq));
return ide_stopped;
}
/* Retry a failed packet command */
if (drive->failed_pc && drive->pc->c[0] == REQUEST_SENSE) {
pc = drive->failed_pc;
goto out;
}
if (postponed_rq != NULL)
if (rq != postponed_rq) {
printk(KERN_ERR "ide-tape: ide-tape.c bug - "
"Two DSC requests were queued\n");
drive->failed_pc = NULL;
rq->errors = 0;
ide_complete_rq(drive, 0, blk_rq_bytes(rq));
return ide_stopped;
}
tape->postponed_rq = NULL;
/*
* If the tape is still busy, postpone our request and service
* the other device meanwhile.
*/
stat = hwif->tp_ops->read_status(hwif);
if ((drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) == 0 &&
(rq->cmd[13] & REQ_IDETAPE_PC2) == 0)
set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
if (drive->dev_flags & IDE_DFLAG_POST_RESET) {
set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
drive->dev_flags &= ~IDE_DFLAG_POST_RESET;
}
if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags) &&
(stat & ATA_DSC) == 0) {
if (postponed_rq == NULL) {
tape->dsc_polling_start = jiffies;
tape->dsc_poll_freq = tape->best_dsc_rw_freq;
tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT;
} else if (time_after(jiffies, tape->dsc_timeout)) {
printk(KERN_ERR "ide-tape: %s: DSC timeout\n",
tape->name);
if (rq->cmd[13] & REQ_IDETAPE_PC2) {
idetape_media_access_finished(drive);
return ide_stopped;
} else {
return ide_do_reset(drive);
}
} else if (time_after(jiffies,
tape->dsc_polling_start +
IDETAPE_DSC_MA_THRESHOLD))
tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW;
idetape_postpone_request(drive);
return ide_stopped;
}
if (rq->cmd[13] & REQ_IDETAPE_READ) {
pc = &tape->queued_pc;
ide_tape_create_rw_cmd(tape, pc, rq, READ_6);
goto out;
}
if (rq->cmd[13] & REQ_IDETAPE_WRITE) {
pc = &tape->queued_pc;
ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6);
goto out;
}
if (rq->cmd[13] & REQ_IDETAPE_PC1) {
pc = (struct ide_atapi_pc *) rq->buffer;
rq->cmd[13] &= ~(REQ_IDETAPE_PC1);
rq->cmd[13] |= REQ_IDETAPE_PC2;
goto out;
}
if (rq->cmd[13] & REQ_IDETAPE_PC2) {
idetape_media_access_finished(drive);
return ide_stopped;
}
BUG();
out:
memset(&cmd, 0, sizeof(cmd));
if (rq_data_dir(rq))
cmd.tf_flags |= IDE_TFLAG_WRITE;
cmd.rq = rq;
return ide_tape_issue_pc(drive, &cmd, pc);
}
/*
* The function below uses __get_free_pages to allocate a data buffer of size
* tape->buffer_size (or a bit more). We attempt to combine sequential pages as
* much as possible.
*
* It returns a pointer to the newly allocated buffer, or NULL in case of
* failure.
*/
static struct idetape_bh *ide_tape_kmalloc_buffer(idetape_tape_t *tape,
int full, int clear)
{
struct idetape_bh *prev_bh, *bh, *merge_bh;
int pages = tape->pages_per_buffer;
unsigned int order, b_allocd;
char *b_data = NULL;
merge_bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
bh = merge_bh;
if (bh == NULL)
goto abort;
order = fls(pages) - 1;
bh->b_data = (char *) __get_free_pages(GFP_KERNEL, order);
if (!bh->b_data)
goto abort;
b_allocd = (1 << order) * PAGE_SIZE;
pages &= (order-1);
if (clear)
memset(bh->b_data, 0, b_allocd);
bh->b_reqnext = NULL;
bh->b_size = b_allocd;
atomic_set(&bh->b_count, full ? bh->b_size : 0);
while (pages) {
order = fls(pages) - 1;
b_data = (char *) __get_free_pages(GFP_KERNEL, order);
if (!b_data)
goto abort;
b_allocd = (1 << order) * PAGE_SIZE;
if (clear)
memset(b_data, 0, b_allocd);
/* newly allocated page frames below buffer header or ...*/
if (bh->b_data == b_data + b_allocd) {
bh->b_size += b_allocd;
bh->b_data -= b_allocd;
if (full)
atomic_add(b_allocd, &bh->b_count);
continue;
}
/* they are above the header */
if (b_data == bh->b_data + bh->b_size) {
bh->b_size += b_allocd;
if (full)
atomic_add(b_allocd, &bh->b_count);
continue;
}
prev_bh = bh;
bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
if (!bh) {
free_pages((unsigned long) b_data, order);
goto abort;
}
bh->b_reqnext = NULL;
bh->b_data = b_data;
bh->b_size = b_allocd;
atomic_set(&bh->b_count, full ? bh->b_size : 0);
prev_bh->b_reqnext = bh;
pages &= (order-1);
}
bh->b_size -= tape->excess_bh_size;
if (full)
atomic_sub(tape->excess_bh_size, &bh->b_count);
return merge_bh;
abort:
ide_tape_kfree_buffer(tape);
return NULL;
}
static int idetape_copy_stage_from_user(idetape_tape_t *tape,
const char __user *buf, int n)
{
struct idetape_bh *bh = tape->bh;
int count;
int ret = 0;
while (n) {
if (bh == NULL) {
printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
__func__);
return 1;
}
count = min((unsigned int)
(bh->b_size - atomic_read(&bh->b_count)),
(unsigned int)n);
if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf,
count))
ret = 1;
n -= count;
atomic_add(count, &bh->b_count);
buf += count;
if (atomic_read(&bh->b_count) == bh->b_size) {
bh = bh->b_reqnext;
if (bh)
atomic_set(&bh->b_count, 0);
}
}
tape->bh = bh;
return ret;
}
static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf,
int n)
{
struct idetape_bh *bh = tape->bh;
int count;
int ret = 0;
while (n) {
if (bh == NULL) {
printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
__func__);
return 1;
}
count = min(tape->b_count, n);
if (copy_to_user(buf, tape->b_data, count))
ret = 1;
n -= count;
tape->b_data += count;
tape->b_count -= count;
buf += count;
if (!tape->b_count) {
bh = bh->b_reqnext;
tape->bh = bh;
if (bh) {
tape->b_data = bh->b_data;
tape->b_count = atomic_read(&bh->b_count);
}
}
}
return ret;
}
static void idetape_init_merge_buffer(idetape_tape_t *tape)
{
struct idetape_bh *bh = tape->merge_bh;
tape->bh = tape->merge_bh;
if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
atomic_set(&bh->b_count, 0);
else {
tape->b_data = bh->b_data;
tape->b_count = atomic_read(&bh->b_count);
}
}
/*
* Write a filemark if write_filemark=1. Flush the device buffers without
* writing a filemark otherwise.
*/
static void idetape_create_write_filemark_cmd(ide_drive_t *drive,
struct ide_atapi_pc *pc, int write_filemark)
{
ide_init_pc(pc);
pc->c[0] = WRITE_FILEMARKS;
pc->c[4] = write_filemark;
pc->flags |= PC_FLAG_WAIT_FOR_DSC;
}
static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
{
idetape_tape_t *tape = drive->driver_data;
struct gendisk *disk = tape->disk;
int load_attempted = 0;
/* Wait for the tape to become ready */
set_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags);
timeout += jiffies;
while (time_before(jiffies, timeout)) {
if (ide_do_test_unit_ready(drive, disk) == 0)
return 0;
if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2)
|| (tape->asc == 0x3A)) {
/* no media */
if (load_attempted)
return -ENOMEDIUM;
ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK);
load_attempted = 1;
/* not about to be ready */
} else if (!(tape->sense_key == 2 && tape->asc == 4 &&
(tape->ascq == 1 || tape->ascq == 8)))
return -EIO;
msleep(100);
}
return -EIO;
}
static int idetape_flush_tape_buffers(ide_drive_t *drive)
{
struct ide_tape_obj *tape = drive->driver_data;
struct ide_atapi_pc pc;
int rc;
idetape_create_write_filemark_cmd(drive, &pc, 0);
rc = ide_queue_pc_tail(drive, tape->disk, &pc);
if (rc)
return rc;
idetape_wait_ready(drive, 60 * 5 * HZ);
return 0;
}
static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc)
{
ide_init_pc(pc);
pc->c[0] = READ_POSITION;
pc->req_xfer = 20;
}
static int idetape_read_position(ide_drive_t *drive)
{
idetape_tape_t *tape = drive->driver_data;
struct ide_atapi_pc pc;
int position;
debug_log(DBG_PROCS, "Enter %s\n", __func__);
idetape_create_read_position_cmd(&pc);
if (ide_queue_pc_tail(drive, tape->disk, &pc))
return -1;
position = tape->first_frame;
return position;
}
static void idetape_create_locate_cmd(ide_drive_t *drive,
struct ide_atapi_pc *pc,
unsigned int block, u8 partition, int skip)
{
ide_init_pc(pc);
pc->c[0] = POSITION_TO_ELEMENT;
pc->c[1] = 2;
put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]);
pc->c[8] = partition;
pc->flags |= PC_FLAG_WAIT_FOR_DSC;
}
static void __ide_tape_discard_merge_buffer(ide_drive_t *drive)
{
idetape_tape_t *tape = drive->driver_data;
if (tape->chrdev_dir != IDETAPE_DIR_READ)
return;
clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags);
tape->merge_bh_size = 0;
if (tape->merge_bh != NULL) {
ide_tape_kfree_buffer(tape);
tape->merge_bh = NULL;
}
tape->chrdev_dir = IDETAPE_DIR_NONE;
}
/*
* Position the tape to the requested block using the LOCATE packet command.
* A READ POSITION command is then issued to check where we are positioned. Like
* all higher level operations, we queue the commands at the tail of the request
* queue and wait for their completion.
*/
static int idetape_position_tape(ide_drive_t *drive, unsigned int block,
u8 partition, int skip)
{
idetape_tape_t *tape = drive->driver_data;
struct gendisk *disk = tape->disk;
int retval;
struct ide_atapi_pc pc;
if (tape->chrdev_dir == IDETAPE_DIR_READ)
__ide_tape_discard_merge_buffer(drive);
idetape_wait_ready(drive, 60 * 5 * HZ);
idetape_create_locate_cmd(drive, &pc, block, partition, skip);
retval = ide_queue_pc_tail(drive, disk, &pc);
if (retval)
return (retval);
idetape_create_read_position_cmd(&pc);
return ide_queue_pc_tail(drive, disk, &pc);
}
static void ide_tape_discard_merge_buffer(ide_drive_t *drive,
int restore_position)
{
idetape_tape_t *tape = drive->driver_data;
int seek, position;
__ide_tape_discard_merge_buffer(drive);
if (restore_position) {
position = idetape_read_position(drive);
seek = position > 0 ? position : 0;
if (idetape_position_tape(drive, seek, 0, 0)) {
printk(KERN_INFO "ide-tape: %s: position_tape failed in"
" %s\n", tape->name, __func__);
return;
}
}
}
/*
* Generate a read/write request for the block device interface and wait for it
* to be serviced.
*/
static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks,
struct idetape_bh *bh)
{
idetape_tape_t *tape = drive->driver_data;
struct request *rq;
int ret, errors;
debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd);
rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
rq->cmd_type = REQ_TYPE_SPECIAL;
rq->cmd[13] = cmd;
rq->rq_disk = tape->disk;
rq->special = (void *)bh;
rq->sector = tape->first_frame;
rq->nr_sectors = blocks;
rq->current_nr_sectors = blocks;
blk_execute_rq(drive->queue, tape->disk, rq, 0);
errors = rq->errors;
ret = tape->blk_size * (blocks - rq->current_nr_sectors);
blk_put_request(rq);
if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0)
return 0;
if (tape->merge_bh)
idetape_init_merge_buffer(tape);
if (errors == IDE_DRV_ERROR_GENERAL)
return -EIO;
return ret;
}
static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc)
{
ide_init_pc(pc);
pc->c[0] = INQUIRY;
pc->c[4] = 254;
pc->req_xfer = 254;
}
static void idetape_create_rewind_cmd(ide_drive_t *drive,
struct ide_atapi_pc *pc)
{
ide_init_pc(pc);
pc->c[0] = REZERO_UNIT;
pc->flags |= PC_FLAG_WAIT_FOR_DSC;
}
static void idetape_create_erase_cmd(struct ide_atapi_pc *pc)
{
ide_init_pc(pc);
pc->c[0] = ERASE;
pc->c[1] = 1;
pc->flags |= PC_FLAG_WAIT_FOR_DSC;
}
static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd)
{
ide_init_pc(pc);
pc->c[0] = SPACE;
put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]);
pc->c[1] = cmd;
pc->flags |= PC_FLAG_WAIT_FOR_DSC;
}
/* Queue up a character device originated write request. */
static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks)
{
idetape_tape_t *tape = drive->driver_data;
debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE,
blocks, tape->merge_bh);
}
static void ide_tape_flush_merge_buffer(ide_drive_t *drive)
{
idetape_tape_t *tape = drive->driver_data;
int blocks, min;
struct idetape_bh *bh;
if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer"
" but we are not writing.\n");
return;
}
if (tape->merge_bh_size > tape->buffer_size) {
printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n");
tape->merge_bh_size = tape->buffer_size;
}
if (tape->merge_bh_size) {
blocks = tape->merge_bh_size / tape->blk_size;
if (tape->merge_bh_size % tape->blk_size) {
unsigned int i;
blocks++;
i = tape->blk_size - tape->merge_bh_size %
tape->blk_size;
bh = tape->bh->b_reqnext;
while (bh) {
atomic_set(&bh->b_count, 0);
bh = bh->b_reqnext;
}
bh = tape->bh;
while (i) {
if (bh == NULL) {
printk(KERN_INFO "ide-tape: bug,"
" bh NULL\n");
break;
}
min = min(i, (unsigned int)(bh->b_size -
atomic_read(&bh->b_count)));
memset(bh->b_data + atomic_read(&bh->b_count),
0, min);
atomic_add(min, &bh->b_count);
i -= min;
bh = bh->b_reqnext;
}
}
(void) idetape_add_chrdev_write_request(drive, blocks);
tape->merge_bh_size = 0;
}
if (tape->merge_bh != NULL) {
ide_tape_kfree_buffer(tape);
tape->merge_bh = NULL;
}
tape->chrdev_dir = IDETAPE_DIR_NONE;
}
static int idetape_init_read(ide_drive_t *drive)
{
idetape_tape_t *tape = drive->driver_data;
int bytes_read;
/* Initialize read operation */
if (tape->chrdev_dir != IDETAPE_DIR_READ) {
if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
ide_tape_flush_merge_buffer(drive);
idetape_flush_tape_buffers(drive);
}
if (tape->merge_bh || tape->merge_bh_size) {
printk(KERN_ERR "ide-tape: merge_bh_size should be"
" 0 now\n");
tape->merge_bh_size = 0;
}
tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0);
if (!tape->merge_bh)
return -ENOMEM;
tape->chrdev_dir = IDETAPE_DIR_READ;
/*
* Issue a read 0 command to ensure that DSC handshake is
* switched from completion mode to buffer available mode.
* No point in issuing this if DSC overlap isn't supported, some
* drives (Seagate STT3401A) will return an error.
*/
if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) {
bytes_read = idetape_queue_rw_tail(drive,
REQ_IDETAPE_READ, 0,
tape->merge_bh);
if (bytes_read < 0) {
ide_tape_kfree_buffer(tape);
tape->merge_bh = NULL;
tape->chrdev_dir = IDETAPE_DIR_NONE;
return bytes_read;
}
}
}
return 0;
}
/* called from idetape_chrdev_read() to service a chrdev read request. */
static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks)
{
idetape_tape_t *tape = drive->driver_data;
debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks);
/* If we are at a filemark, return a read length of 0 */
if (test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags))
return 0;
idetape_init_read(drive);
return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks,
tape->merge_bh);
}
static void idetape_pad_zeros(ide_drive_t *drive, int bcount)
{
idetape_tape_t *tape = drive->driver_data;
struct idetape_bh *bh;
int blocks;
while (bcount) {
unsigned int count;
bh = tape->merge_bh;
count = min(tape->buffer_size, bcount);
bcount -= count;
blocks = count / tape->blk_size;
while (count) {
atomic_set(&bh->b_count,
min(count, (unsigned int)bh->b_size));
memset(bh->b_data, 0, atomic_read(&bh->b_count));
count -= atomic_read(&bh->b_count);
bh = bh->b_reqnext;
}
idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks,
tape->merge_bh);
}
}
/*
* Rewinds the tape to the Beginning Of the current Partition (BOP). We
* currently support only one partition.
*/
static int idetape_rewind_tape(ide_drive_t *drive)
{
struct ide_tape_obj *tape = drive->driver_data;
struct gendisk *disk = tape->disk;
int retval;
struct ide_atapi_pc pc;
debug_log(DBG_SENSE, "Enter %s\n", __func__);
idetape_create_rewind_cmd(drive, &pc);
retval = ide_queue_pc_tail(drive, disk, &pc);
if (retval)
return retval;
idetape_create_read_position_cmd(&pc);
retval = ide_queue_pc_tail(drive, disk, &pc);
if (retval)
return retval;
return 0;
}
/* mtio.h compatible commands should be issued to the chrdev interface. */
static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd,
unsigned long arg)
{
idetape_tape_t *tape = drive->driver_data;
void __user *argp = (void __user *)arg;
struct idetape_config {
int dsc_rw_frequency;
int dsc_media_access_frequency;
int nr_stages;
} config;
debug_log(DBG_PROCS, "Enter %s\n", __func__);
switch (cmd) {
case 0x0340:
if (copy_from_user(&config, argp, sizeof(config)))
return -EFAULT;
tape->best_dsc_rw_freq = config.dsc_rw_frequency;
break;
case 0x0350:
config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq;
config.nr_stages = 1;
if (copy_to_user(argp, &config, sizeof(config)))
return -EFAULT;
break;
default:
return -EIO;
}
return 0;
}
static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op,
int mt_count)
{
idetape_tape_t *tape = drive->driver_data;
struct gendisk *disk = tape->disk;
struct ide_atapi_pc pc;
int retval, count = 0;
int sprev = !!(tape->caps[4] & 0x20);
if (mt_count == 0)
return 0;
if (MTBSF == mt_op || MTBSFM == mt_op) {
if (!sprev)
return -EIO;
mt_count = -mt_count;
}
if (tape->chrdev_dir == IDETAPE_DIR_READ) {
tape->merge_bh_size = 0;
if (test_and_clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags))
++count;
ide_tape_discard_merge_buffer(drive, 0);
}
switch (mt_op) {
case MTFSF:
case MTBSF:
idetape_create_space_cmd(&pc, mt_count - count,
IDETAPE_SPACE_OVER_FILEMARK);
return ide_queue_pc_tail(drive, disk, &pc);
case MTFSFM:
case MTBSFM:
if (!sprev)
return -EIO;
retval = idetape_space_over_filemarks(drive, MTFSF,
mt_count - count);
if (retval)
return retval;
count = (MTBSFM == mt_op ? 1 : -1);
return idetape_space_over_filemarks(drive, MTFSF, count);
default:
printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
mt_op);
return -EIO;
}
}
/*
* Our character device read / write functions.
*
* The tape is optimized to maximize throughput when it is transferring an
* integral number of the "continuous transfer limit", which is a parameter of
* the specific tape (26kB on my particular tape, 32kB for Onstream).
*
* As of version 1.3 of the driver, the character device provides an abstract
* continuous view of the media - any mix of block sizes (even 1 byte) on the
* same backup/restore procedure is supported. The driver will internally
* convert the requests to the recommended transfer unit, so that an unmatch
* between the user's block size to the recommended size will only result in a
* (slightly) increased driver overhead, but will no longer hit performance.
* This is not applicable to Onstream.
*/
static ssize_t idetape_chrdev_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
struct ide_tape_obj *tape = file->private_data;
ide_drive_t *drive = tape->drive;
ssize_t bytes_read, temp, actually_read = 0, rc;
ssize_t ret = 0;
u16 ctl = *(u16 *)&tape->caps[12];
debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
if (tape->chrdev_dir != IDETAPE_DIR_READ) {
if (test_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags))
if (count > tape->blk_size &&
(count % tape->blk_size) == 0)
tape->user_bs_factor = count / tape->blk_size;
}
rc = idetape_init_read(drive);
if (rc < 0)
return rc;
if (count == 0)
return (0);
if (tape->merge_bh_size) {
actually_read = min((unsigned int)(tape->merge_bh_size),
(unsigned int)count);
if (idetape_copy_stage_to_user(tape, buf, actually_read))
ret = -EFAULT;
buf += actually_read;
tape->merge_bh_size -= actually_read;
count -= actually_read;
}
while (count >= tape->buffer_size) {
bytes_read = idetape_add_chrdev_read_request(drive, ctl);
if (bytes_read <= 0)
goto finish;
if (idetape_copy_stage_to_user(tape, buf, bytes_read))
ret = -EFAULT;
buf += bytes_read;
count -= bytes_read;
actually_read += bytes_read;
}
if (count) {
bytes_read = idetape_add_chrdev_read_request(drive, ctl);
if (bytes_read <= 0)
goto finish;
temp = min((unsigned long)count, (unsigned long)bytes_read);
if (idetape_copy_stage_to_user(tape, buf, temp))
ret = -EFAULT;
actually_read += temp;
tape->merge_bh_size = bytes_read-temp;
}
finish:
if (!actually_read && test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) {
debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name);
idetape_space_over_filemarks(drive, MTFSF, 1);
return 0;
}
return ret ? ret : actually_read;
}
static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
struct ide_tape_obj *tape = file->private_data;
ide_drive_t *drive = tape->drive;
ssize_t actually_written = 0;
ssize_t ret = 0;
u16 ctl = *(u16 *)&tape->caps[12];
/* The drive is write protected. */
if (tape->write_prot)
return -EACCES;
debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
/* Initialize write operation */
if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
if (tape->chrdev_dir == IDETAPE_DIR_READ)
ide_tape_discard_merge_buffer(drive, 1);
if (tape->merge_bh || tape->merge_bh_size) {
printk(KERN_ERR "ide-tape: merge_bh_size "
"should be 0 now\n");
tape->merge_bh_size = 0;
}
tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0);
if (!tape->merge_bh)
return -ENOMEM;
tape->chrdev_dir = IDETAPE_DIR_WRITE;
idetape_init_merge_buffer(tape);
/*
* Issue a write 0 command to ensure that DSC handshake is
* switched from completion mode to buffer available mode. No
* point in issuing this if DSC overlap isn't supported, some
* drives (Seagate STT3401A) will return an error.
*/
if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) {
ssize_t retval = idetape_queue_rw_tail(drive,
REQ_IDETAPE_WRITE, 0,
tape->merge_bh);
if (retval < 0) {
ide_tape_kfree_buffer(tape);
tape->merge_bh = NULL;
tape->chrdev_dir = IDETAPE_DIR_NONE;
return retval;
}
}
}
if (count == 0)
return (0);
if (tape->merge_bh_size) {
if (tape->merge_bh_size >= tape->buffer_size) {
printk(KERN_ERR "ide-tape: bug: merge buf too big\n");
tape->merge_bh_size = 0;
}
actually_written = min((unsigned int)
(tape->buffer_size - tape->merge_bh_size),
(unsigned int)count);
if (idetape_copy_stage_from_user(tape, buf, actually_written))
ret = -EFAULT;
buf += actually_written;
tape->merge_bh_size += actually_written;
count -= actually_written;
if (tape->merge_bh_size == tape->buffer_size) {
ssize_t retval;
tape->merge_bh_size = 0;
retval = idetape_add_chrdev_write_request(drive, ctl);
if (retval <= 0)
return (retval);
}
}
while (count >= tape->buffer_size) {
ssize_t retval;
if (idetape_copy_stage_from_user(tape, buf, tape->buffer_size))
ret = -EFAULT;
buf += tape->buffer_size;
count -= tape->buffer_size;
retval = idetape_add_chrdev_write_request(drive, ctl);
actually_written += tape->buffer_size;
if (retval <= 0)
return (retval);
}
if (count) {
actually_written += count;
if (idetape_copy_stage_from_user(tape, buf, count))
ret = -EFAULT;
tape->merge_bh_size += count;
}
return ret ? ret : actually_written;
}
static int idetape_write_filemark(ide_drive_t *drive)
{
struct ide_tape_obj *tape = drive->driver_data;
struct ide_atapi_pc pc;
/* Write a filemark */
idetape_create_write_filemark_cmd(drive, &pc, 1);
if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
printk(KERN_ERR "ide-tape: Couldn't write a filemark\n");
return -EIO;
}
return 0;
}
/*
* Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
* requested.
*
* Note: MTBSF and MTBSFM are not supported when the tape doesn't support
* spacing over filemarks in the reverse direction. In this case, MTFSFM is also
* usually not supported.
*
* The following commands are currently not supported:
*
* MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
* MT_ST_WRITE_THRESHOLD.
*/
static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count)
{
idetape_tape_t *tape = drive->driver_data;
struct gendisk *disk = tape->disk;
struct ide_atapi_pc pc;
int i, retval;
debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
mt_op, mt_count);
switch (mt_op) {
case MTFSF:
case MTFSFM:
case MTBSF:
case MTBSFM:
if (!mt_count)
return 0;
return idetape_space_over_filemarks(drive, mt_op, mt_count);
default:
break;
}
switch (mt_op) {
case MTWEOF:
if (tape->write_prot)
return -EACCES;
ide_tape_discard_merge_buffer(drive, 1);
for (i = 0; i < mt_count; i++) {
retval = idetape_write_filemark(drive);
if (retval)
return retval;
}
return 0;
case MTREW:
ide_tape_discard_merge_buffer(drive, 0);
if (idetape_rewind_tape(drive))
return -EIO;
return 0;
case MTLOAD:
ide_tape_discard_merge_buffer(drive, 0);
return ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK);
case MTUNLOAD:
case MTOFFL:
/*
* If door is locked, attempt to unlock before
* attempting to eject.
*/
if (tape->door_locked) {
if (!ide_set_media_lock(drive, disk, 0))
tape->door_locked = DOOR_UNLOCKED;
}
ide_tape_discard_merge_buffer(drive, 0);
retval = ide_do_start_stop(drive, disk, !IDETAPE_LU_LOAD_MASK);
if (!retval)
clear_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags);
return retval;
case MTNOP:
ide_tape_discard_merge_buffer(drive, 0);
return idetape_flush_tape_buffers(drive);
case MTRETEN:
ide_tape_discard_merge_buffer(drive, 0);
return ide_do_start_stop(drive, disk,
IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
case MTEOM:
idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD);
return ide_queue_pc_tail(drive, disk, &pc);
case MTERASE:
(void)idetape_rewind_tape(drive);
idetape_create_erase_cmd(&pc);
return ide_queue_pc_tail(drive, disk, &pc);
case MTSETBLK:
if (mt_count) {
if (mt_count < tape->blk_size ||
mt_count % tape->blk_size)
return -EIO;
tape->user_bs_factor = mt_count / tape->blk_size;
clear_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags);
} else
set_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags);
return 0;
case MTSEEK:
ide_tape_discard_merge_buffer(drive, 0);
return idetape_position_tape(drive,
mt_count * tape->user_bs_factor, tape->partition, 0);
case MTSETPART:
ide_tape_discard_merge_buffer(drive, 0);
return idetape_position_tape(drive, 0, mt_count, 0);
case MTFSR:
case MTBSR:
case MTLOCK:
retval = ide_set_media_lock(drive, disk, 1);
if (retval)
return retval;
tape->door_locked = DOOR_EXPLICITLY_LOCKED;
return 0;
case MTUNLOCK:
retval = ide_set_media_lock(drive, disk, 0);
if (retval)
return retval;
tape->door_locked = DOOR_UNLOCKED;
return 0;
default:
printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
mt_op);
return -EIO;
}
}
/*
* Our character device ioctls. General mtio.h magnetic io commands are
* supported here, and not in the corresponding block interface. Our own
* ide-tape ioctls are supported on both interfaces.
*/
static int idetape_chrdev_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
struct ide_tape_obj *tape = file->private_data;
ide_drive_t *drive = tape->drive;
struct mtop mtop;
struct mtget mtget;
struct mtpos mtpos;
int block_offset = 0, position = tape->first_frame;
void __user *argp = (void __user *)arg;
debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd);
if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
ide_tape_flush_merge_buffer(drive);
idetape_flush_tape_buffers(drive);
}
if (cmd == MTIOCGET || cmd == MTIOCPOS) {
block_offset = tape->merge_bh_size /
(tape->blk_size * tape->user_bs_factor);
position = idetape_read_position(drive);
if (position < 0)
return -EIO;
}
switch (cmd) {
case MTIOCTOP:
if (copy_from_user(&mtop, argp, sizeof(struct mtop)))
return -EFAULT;
return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count);
case MTIOCGET:
memset(&mtget, 0, sizeof(struct mtget));
mtget.mt_type = MT_ISSCSI2;
mtget.mt_blkno = position / tape->user_bs_factor - block_offset;
mtget.mt_dsreg =
((tape->blk_size * tape->user_bs_factor)
<< MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
if (tape->drv_write_prot)
mtget.mt_gstat |= GMT_WR_PROT(0xffffffff);
if (copy_to_user(argp, &mtget, sizeof(struct mtget)))
return -EFAULT;
return 0;
case MTIOCPOS:
mtpos.mt_blkno = position / tape->user_bs_factor - block_offset;
if (copy_to_user(argp, &mtpos, sizeof(struct mtpos)))
return -EFAULT;
return 0;
default:
if (tape->chrdev_dir == IDETAPE_DIR_READ)
ide_tape_discard_merge_buffer(drive, 1);
return idetape_blkdev_ioctl(drive, cmd, arg);
}
}
/*
* Do a mode sense page 0 with block descriptor and if it succeeds set the tape
* block size with the reported value.
*/
static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive)
{
idetape_tape_t *tape = drive->driver_data;
struct ide_atapi_pc pc;
idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR);
if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
printk(KERN_ERR "ide-tape: Can't get block descriptor\n");
if (tape->blk_size == 0) {
printk(KERN_WARNING "ide-tape: Cannot deal with zero "
"block size, assuming 32k\n");
tape->blk_size = 32768;
}
return;
}
tape->blk_size = (pc.buf[4 + 5] << 16) +
(pc.buf[4 + 6] << 8) +
pc.buf[4 + 7];
tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7;
}
static int idetape_chrdev_open(struct inode *inode, struct file *filp)
{
unsigned int minor = iminor(inode), i = minor & ~0xc0;
ide_drive_t *drive;
idetape_tape_t *tape;
int retval;
if (i >= MAX_HWIFS * MAX_DRIVES)
return -ENXIO;
lock_kernel();
tape = ide_tape_chrdev_get(i);
if (!tape) {
unlock_kernel();
return -ENXIO;
}
debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
/*
* We really want to do nonseekable_open(inode, filp); here, but some
* versions of tar incorrectly call lseek on tapes and bail out if that
* fails. So we disallow pread() and pwrite(), but permit lseeks.
*/
filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
drive = tape->drive;
filp->private_data = tape;
if (test_and_set_bit(IDE_AFLAG_BUSY, &drive->atapi_flags)) {
retval = -EBUSY;
goto out_put_tape;
}
retval = idetape_wait_ready(drive, 60 * HZ);
if (retval) {
clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name);
goto out_put_tape;
}
idetape_read_position(drive);
if (!test_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags))
(void)idetape_rewind_tape(drive);
/* Read block size and write protect status from drive. */
ide_tape_get_bsize_from_bdesc(drive);
/* Set write protect flag if device is opened as read-only. */
if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
tape->write_prot = 1;
else
tape->write_prot = tape->drv_write_prot;
/* Make sure drive isn't write protected if user wants to write. */
if (tape->write_prot) {
if ((filp->f_flags & O_ACCMODE) == O_WRONLY ||
(filp->f_flags & O_ACCMODE) == O_RDWR) {
clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
retval = -EROFS;
goto out_put_tape;
}
}
/* Lock the tape drive door so user can't eject. */
if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
if (!ide_set_media_lock(drive, tape->disk, 1)) {
if (tape->door_locked != DOOR_EXPLICITLY_LOCKED)
tape->door_locked = DOOR_LOCKED;
}
}
unlock_kernel();
return 0;
out_put_tape:
ide_tape_put(tape);
unlock_kernel();
return retval;
}
static void idetape_write_release(ide_drive_t *drive, unsigned int minor)
{
idetape_tape_t *tape = drive->driver_data;
ide_tape_flush_merge_buffer(drive);
tape->merge_bh = ide_tape_kmalloc_buffer(tape, 1, 0);
if (tape->merge_bh != NULL) {
idetape_pad_zeros(drive, tape->blk_size *
(tape->user_bs_factor - 1));
ide_tape_kfree_buffer(tape);
tape->merge_bh = NULL;
}
idetape_write_filemark(drive);
idetape_flush_tape_buffers(drive);
idetape_flush_tape_buffers(drive);
}
static int idetape_chrdev_release(struct inode *inode, struct file *filp)
{
struct ide_tape_obj *tape = filp->private_data;
ide_drive_t *drive = tape->drive;
unsigned int minor = iminor(inode);
lock_kernel();
tape = drive->driver_data;
debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
idetape_write_release(drive, minor);
if (tape->chrdev_dir == IDETAPE_DIR_READ) {
if (minor < 128)
ide_tape_discard_merge_buffer(drive, 1);
}
if (minor < 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags))
(void) idetape_rewind_tape(drive);
if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
if (tape->door_locked == DOOR_LOCKED) {
if (!ide_set_media_lock(drive, tape->disk, 0))
tape->door_locked = DOOR_UNLOCKED;
}
}
clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
ide_tape_put(tape);
unlock_kernel();
return 0;
}
static void idetape_get_inquiry_results(ide_drive_t *drive)
{
idetape_tape_t *tape = drive->driver_data;
struct ide_atapi_pc pc;
u8 pc_buf[256];
char fw_rev[4], vendor_id[8], product_id[16];
idetape_create_inquiry_cmd(&pc);
pc.buf = &pc_buf[0];
pc.buf_size = sizeof(pc_buf);
if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n",
tape->name);
return;
}
memcpy(vendor_id, &pc.buf[8], 8);
memcpy(product_id, &pc.buf[16], 16);
memcpy(fw_rev, &pc.buf[32], 4);
ide_fixstring(vendor_id, 8, 0);
ide_fixstring(product_id, 16, 0);
ide_fixstring(fw_rev, 4, 0);
printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n",
drive->name, tape->name, vendor_id, product_id, fw_rev);
}
/*
* Ask the tape about its various parameters. In particular, we will adjust our
* data transfer buffer size to the recommended value as returned by the tape.
*/
static void idetape_get_mode_sense_results(ide_drive_t *drive)
{
idetape_tape_t *tape = drive->driver_data;
struct ide_atapi_pc pc;
u8 *caps;
u8 speed, max_speed;
idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming"
" some default values\n");
tape->blk_size = 512;
put_unaligned(52, (u16 *)&tape->caps[12]);
put_unaligned(540, (u16 *)&tape->caps[14]);
put_unaligned(6*52, (u16 *)&tape->caps[16]);
return;
}
caps = pc.buf + 4 + pc.buf[3];
/* convert to host order and save for later use */
speed = be16_to_cpup((__be16 *)&caps[14]);
max_speed = be16_to_cpup((__be16 *)&caps[8]);
*(u16 *)&caps[8] = max_speed;
*(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]);
*(u16 *)&caps[14] = speed;
*(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]);
if (!speed) {
printk(KERN_INFO "ide-tape: %s: invalid tape speed "
"(assuming 650KB/sec)\n", drive->name);
*(u16 *)&caps[14] = 650;
}
if (!max_speed) {
printk(KERN_INFO "ide-tape: %s: invalid max_speed "
"(assuming 650KB/sec)\n", drive->name);
*(u16 *)&caps[8] = 650;
}
memcpy(&tape->caps, caps, 20);
/* device lacks locking support according to capabilities page */
if ((caps[6] & 1) == 0)
drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING;
if (caps[7] & 0x02)
tape->blk_size = 512;
else if (caps[7] & 0x04)
tape->blk_size = 1024;
}
#ifdef CONFIG_IDE_PROC_FS
#define ide_tape_devset_get(name, field) \
static int get_##name(ide_drive_t *drive) \
{ \
idetape_tape_t *tape = drive->driver_data; \
return tape->field; \
}
#define ide_tape_devset_set(name, field) \
static int set_##name(ide_drive_t *drive, int arg) \
{ \
idetape_tape_t *tape = drive->driver_data; \
tape->field = arg; \
return 0; \
}
#define ide_tape_devset_rw_field(_name, _field) \
ide_tape_devset_get(_name, _field) \
ide_tape_devset_set(_name, _field) \
IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name)
#define ide_tape_devset_r_field(_name, _field) \
ide_tape_devset_get(_name, _field) \
IDE_DEVSET(_name, 0, get_##_name, NULL)
static int mulf_tdsc(ide_drive_t *drive) { return 1000; }
static int divf_tdsc(ide_drive_t *drive) { return HZ; }
static int divf_buffer(ide_drive_t *drive) { return 2; }
static int divf_buffer_size(ide_drive_t *drive) { return 1024; }
ide_devset_rw_flag(dsc_overlap, IDE_DFLAG_DSC_OVERLAP);
ide_tape_devset_rw_field(debug_mask, debug_mask);
ide_tape_devset_rw_field(tdsc, best_dsc_rw_freq);
ide_tape_devset_r_field(avg_speed, avg_speed);
ide_tape_devset_r_field(speed, caps[14]);
ide_tape_devset_r_field(buffer, caps[16]);
ide_tape_devset_r_field(buffer_size, buffer_size);
static const struct ide_proc_devset idetape_settings[] = {
__IDE_PROC_DEVSET(avg_speed, 0, 0xffff, NULL, NULL),
__IDE_PROC_DEVSET(buffer, 0, 0xffff, NULL, divf_buffer),
__IDE_PROC_DEVSET(buffer_size, 0, 0xffff, NULL, divf_buffer_size),
__IDE_PROC_DEVSET(debug_mask, 0, 0xffff, NULL, NULL),
__IDE_PROC_DEVSET(dsc_overlap, 0, 1, NULL, NULL),
__IDE_PROC_DEVSET(speed, 0, 0xffff, NULL, NULL),
__IDE_PROC_DEVSET(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX,
mulf_tdsc, divf_tdsc),
{ NULL },
};
#endif
/*
* The function below is called to:
*
* 1. Initialize our various state variables.
* 2. Ask the tape for its capabilities.
* 3. Allocate a buffer which will be used for data transfer. The buffer size
* is chosen based on the recommendation which we received in step 2.
*
* Note that at this point ide.c already assigned us an irq, so that we can
* queue requests here and wait for their completion.
*/
static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor)
{
unsigned long t;
int speed;
int buffer_size;
u16 *ctl = (u16 *)&tape->caps[12];
drive->pc_callback = ide_tape_callback;
drive->pc_update_buffers = idetape_update_buffers;
drive->pc_io_buffers = ide_tape_io_buffers;
drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP;
if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) {
printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n",
tape->name);
drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
}
/* Seagate Travan drives do not support DSC overlap. */
if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401"))
drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
tape->minor = minor;
tape->name[0] = 'h';
tape->name[1] = 't';
tape->name[2] = '0' + minor;
tape->chrdev_dir = IDETAPE_DIR_NONE;
idetape_get_inquiry_results(drive);
idetape_get_mode_sense_results(drive);
ide_tape_get_bsize_from_bdesc(drive);
tape->user_bs_factor = 1;
tape->buffer_size = *ctl * tape->blk_size;
while (tape->buffer_size > 0xffff) {
printk(KERN_NOTICE "ide-tape: decreasing stage size\n");
*ctl /= 2;
tape->buffer_size = *ctl * tape->blk_size;
}
buffer_size = tape->buffer_size;
tape->pages_per_buffer = buffer_size / PAGE_SIZE;
if (buffer_size % PAGE_SIZE) {
tape->pages_per_buffer++;
tape->excess_bh_size = PAGE_SIZE - buffer_size % PAGE_SIZE;
}
/* select the "best" DSC read/write polling freq */
speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]);
t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000);
/*
* Ensure that the number we got makes sense; limit it within
* IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
*/
tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN,
IDETAPE_DSC_RW_MAX);
printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
"%lums tDSC%s\n",
drive->name, tape->name, *(u16 *)&tape->caps[14],
(*(u16 *)&tape->caps[16] * 512) / tape->buffer_size,
tape->buffer_size / 1024,
tape->best_dsc_rw_freq * 1000 / HZ,
(drive->dev_flags & IDE_DFLAG_USING_DMA) ? ", DMA" : "");
ide_proc_register_driver(drive, tape->driver);
}
static void ide_tape_remove(ide_drive_t *drive)
{
idetape_tape_t *tape = drive->driver_data;
ide_proc_unregister_driver(drive, tape->driver);
device_del(&tape->dev);
ide_unregister_region(tape->disk);
mutex_lock(&idetape_ref_mutex);
put_device(&tape->dev);
mutex_unlock(&idetape_ref_mutex);
}
static void ide_tape_release(struct device *dev)
{
struct ide_tape_obj *tape = to_ide_drv(dev, ide_tape_obj);
ide_drive_t *drive = tape->drive;
struct gendisk *g = tape->disk;
BUG_ON(tape->merge_bh_size);
drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
drive->driver_data = NULL;
device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor));
device_destroy(idetape_sysfs_class,
MKDEV(IDETAPE_MAJOR, tape->minor + 128));
idetape_devs[tape->minor] = NULL;
g->private_data = NULL;
put_disk(g);
kfree(tape);
}
#ifdef CONFIG_IDE_PROC_FS
static int proc_idetape_read_name
(char *page, char **start, off_t off, int count, int *eof, void *data)
{
ide_drive_t *drive = (ide_drive_t *) data;
idetape_tape_t *tape = drive->driver_data;
char *out = page;
int len;
len = sprintf(out, "%s\n", tape->name);
PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
}
static ide_proc_entry_t idetape_proc[] = {
{ "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
{ "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL },
{ NULL, 0, NULL, NULL }
};
static ide_proc_entry_t *ide_tape_proc_entries(ide_drive_t *drive)
{
return idetape_proc;
}
static const struct ide_proc_devset *ide_tape_proc_devsets(ide_drive_t *drive)
{
return idetape_settings;
}
#endif
static int ide_tape_probe(ide_drive_t *);
static struct ide_driver idetape_driver = {
.gen_driver = {
.owner = THIS_MODULE,
.name = "ide-tape",
.bus = &ide_bus_type,
},
.probe = ide_tape_probe,
.remove = ide_tape_remove,
.version = IDETAPE_VERSION,
.do_request = idetape_do_request,
#ifdef CONFIG_IDE_PROC_FS
.proc_entries = ide_tape_proc_entries,
.proc_devsets = ide_tape_proc_devsets,
#endif
};
/* Our character device supporting functions, passed to register_chrdev. */
static const struct file_operations idetape_fops = {
.owner = THIS_MODULE,
.read = idetape_chrdev_read,
.write = idetape_chrdev_write,
.ioctl = idetape_chrdev_ioctl,
.open = idetape_chrdev_open,
.release = idetape_chrdev_release,
};
static int idetape_open(struct block_device *bdev, fmode_t mode)
{
struct ide_tape_obj *tape = ide_tape_get(bdev->bd_disk);
if (!tape)
return -ENXIO;
return 0;
}
static int idetape_release(struct gendisk *disk, fmode_t mode)
{
struct ide_tape_obj *tape = ide_drv_g(disk, ide_tape_obj);
ide_tape_put(tape);
return 0;
}
static int idetape_ioctl(struct block_device *bdev, fmode_t mode,
unsigned int cmd, unsigned long arg)
{
struct ide_tape_obj *tape = ide_drv_g(bdev->bd_disk, ide_tape_obj);
ide_drive_t *drive = tape->drive;
int err = generic_ide_ioctl(drive, bdev, cmd, arg);
if (err == -EINVAL)
err = idetape_blkdev_ioctl(drive, cmd, arg);
return err;
}
static struct block_device_operations idetape_block_ops = {
.owner = THIS_MODULE,
.open = idetape_open,
.release = idetape_release,
.locked_ioctl = idetape_ioctl,
};
static int ide_tape_probe(ide_drive_t *drive)
{
idetape_tape_t *tape;
struct gendisk *g;
int minor;
if (!strstr("ide-tape", drive->driver_req))
goto failed;
if (drive->media != ide_tape)
goto failed;
if ((drive->dev_flags & IDE_DFLAG_ID_READ) &&
ide_check_atapi_device(drive, DRV_NAME) == 0) {
printk(KERN_ERR "ide-tape: %s: not supported by this version of"
" the driver\n", drive->name);
goto failed;
}
tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL);
if (tape == NULL) {
printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n",
drive->name);
goto failed;
}
g = alloc_disk(1 << PARTN_BITS);
if (!g)
goto out_free_tape;
ide_init_disk(g, drive);
tape->dev.parent = &drive->gendev;
tape->dev.release = ide_tape_release;
dev_set_name(&tape->dev, dev_name(&drive->gendev));
if (device_register(&tape->dev))
goto out_free_disk;
tape->drive = drive;
tape->driver = &idetape_driver;
tape->disk = g;
g->private_data = &tape->driver;
drive->driver_data = tape;
mutex_lock(&idetape_ref_mutex);
for (minor = 0; idetape_devs[minor]; minor++)
;
idetape_devs[minor] = tape;
mutex_unlock(&idetape_ref_mutex);
idetape_setup(drive, tape, minor);
device_create(idetape_sysfs_class, &drive->gendev,
MKDEV(IDETAPE_MAJOR, minor), NULL, "%s", tape->name);
device_create(idetape_sysfs_class, &drive->gendev,
MKDEV(IDETAPE_MAJOR, minor + 128), NULL,
"n%s", tape->name);
g->fops = &idetape_block_ops;
ide_register_region(g);
return 0;
out_free_disk:
put_disk(g);
out_free_tape:
kfree(tape);
failed:
return -ENODEV;
}
static void __exit idetape_exit(void)
{
driver_unregister(&idetape_driver.gen_driver);
class_destroy(idetape_sysfs_class);
unregister_chrdev(IDETAPE_MAJOR, "ht");
}
static int __init idetape_init(void)
{
int error = 1;
idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape");
if (IS_ERR(idetape_sysfs_class)) {
idetape_sysfs_class = NULL;
printk(KERN_ERR "Unable to create sysfs class for ide tapes\n");
error = -EBUSY;
goto out;
}
if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) {
printk(KERN_ERR "ide-tape: Failed to register chrdev"
" interface\n");
error = -EBUSY;
goto out_free_class;
}
error = driver_register(&idetape_driver.gen_driver);
if (error)
goto out_free_driver;
return 0;
out_free_driver:
driver_unregister(&idetape_driver.gen_driver);
out_free_class:
class_destroy(idetape_sysfs_class);
out:
return error;
}
MODULE_ALIAS("ide:*m-tape*");
module_init(idetape_init);
module_exit(idetape_exit);
MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR);
MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
MODULE_LICENSE("GPL");
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