v4.19.13 snapshot.
diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
new file mode 100644
index 0000000..34c1165
--- /dev/null
+++ b/drivers/ide/ide-tape.c
@@ -0,0 +1,2059 @@
+/*
+ * 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/seq_file.h>
+#include <linux/slab.h>
+#include <linux/pci.h>
+#include <linux/ide.h>
+#include <linux/completion.h>
+#include <linux/bitops.h>
+#include <linux/mutex.h>
+#include <scsi/scsi.h>
+
+#include <asm/byteorder.h>
+#include <linux/uaccess.h>
+#include <linux/io.h>
+#include <asm/unaligned.h>
+#include <linux/mtio.h>
+
+/* define to see debug info */
+#undef IDETAPE_DEBUG_LOG
+
+#ifdef IDETAPE_DEBUG_LOG
+#define ide_debug_log(lvl, fmt, args...) __ide_debug_log(lvl, fmt, ## args)
+#else
+#define ide_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),
+};
+
+/* 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.
+ */
+ bool 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;
+ /* Staging buffer of buffer_size bytes */
+ void *buf;
+ /* The read/write cursor */
+ void *cur;
+ /* The number of valid bytes in buf */
+ size_t valid;
+
+ /* 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;
+} idetape_tape_t;
+
+static DEFINE_MUTEX(ide_tape_mutex);
+static DEFINE_MUTEX(idetape_ref_mutex);
+
+static DEFINE_MUTEX(idetape_chrdev_mutex);
+
+static struct class *idetape_sysfs_class;
+
+static void ide_tape_release(struct device *);
+
+static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES];
+
+static struct ide_tape_obj *ide_tape_get(struct gendisk *disk, bool cdev,
+ unsigned int i)
+{
+ struct ide_tape_obj *tape = NULL;
+
+ mutex_lock(&idetape_ref_mutex);
+
+ if (cdev)
+ tape = idetape_devs[i];
+ else
+ 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);
+}
+
+/*
+ * 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)
+{
+ idetape_tape_t *tape = drive->driver_data;
+ struct ide_atapi_pc *pc = drive->failed_pc;
+ struct request *rq = drive->hwif->rq;
+ u8 *sense = bio_data(rq->bio);
+
+ tape->sense_key = sense[2] & 0xF;
+ tape->asc = sense[12];
+ tape->ascq = sense[13];
+
+ ide_debug_log(IDE_DBG_FUNC,
+ "cmd: 0x%x, sense key = %x, asc = %x, ascq = %x",
+ rq->cmd[0], tape->sense_key, tape->asc, tape->ascq);
+
+ /* correct remaining bytes to transfer */
+ if (pc->flags & PC_FLAG_DMA_ERROR)
+ scsi_req(rq)->resid_len = tape->blk_size * get_unaligned_be32(&sense[3]);
+
+ /*
+ * 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) &&
+ (blk_rq_bytes(rq) - scsi_req(rq)->resid_len))
+ pc->retries = IDETAPE_MAX_PC_RETRIES + 1;
+ }
+}
+
+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;
+
+ ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x, dsc: %d, err: %d", rq->cmd[0],
+ dsc, err);
+
+ 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);
+ 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) {
+ unsigned int blocks =
+ (blk_rq_bytes(rq) - scsi_req(rq)->resid_len) / 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;
+
+ if (pc->error) {
+ uptodate = 0;
+ err = pc->error;
+ }
+ }
+ scsi_req(rq)->result = 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 ide_tape_stall_queue(ide_drive_t *drive)
+{
+ idetape_tape_t *tape = drive->driver_data;
+
+ ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x, dsc_poll_freq: %lu",
+ drive->hwif->rq->cmd[0], tape->dsc_poll_freq);
+
+ tape->postponed_rq = true;
+
+ 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 */
+ ide_tape_stall_queue(drive);
+}
+
+/*
+ * 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;
+ struct request *rq = drive->hwif->rq;
+
+ 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);
+ ide_complete_rq(drive, BLK_STS_IOERR, blk_rq_bytes(rq));
+ return ide_stopped;
+ }
+ ide_debug_log(IDE_DBG_SENSE, "retry #%d, cmd: 0x%02x", 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);
+ 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)
+{
+ unsigned int length = blk_rq_sectors(rq) / (tape->blk_size >> 9);
+
+ ide_init_pc(pc);
+ put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
+ pc->c[1] = 1;
+
+ if (blk_rq_bytes(rq) == tape->buffer_size)
+ pc->flags |= PC_FLAG_DMA_OK;
+
+ if (opcode == READ_6)
+ pc->c[0] = READ_6;
+ else if (opcode == WRITE_6) {
+ pc->c[0] = WRITE_6;
+ pc->flags |= PC_FLAG_WRITING;
+ }
+
+ memcpy(scsi_req(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 ide_cmd cmd;
+ struct scsi_request *req = scsi_req(rq);
+ u8 stat;
+
+ ide_debug_log(IDE_DBG_RQ, "cmd: 0x%x, sector: %llu, nr_sectors: %u",
+ req->cmd[0], (unsigned long long)blk_rq_pos(rq),
+ blk_rq_sectors(rq));
+
+ BUG_ON(!blk_rq_is_private(rq));
+ BUG_ON(ide_req(rq)->type != ATA_PRIV_MISC &&
+ ide_req(rq)->type != ATA_PRIV_SENSE);
+
+ /* Retry a failed packet command */
+ if (drive->failed_pc && drive->pc->c[0] == REQUEST_SENSE) {
+ pc = drive->failed_pc;
+ goto out;
+ }
+
+ /*
+ * 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 &&
+ (req->cmd[13] & REQ_IDETAPE_PC2) == 0)
+ drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC;
+
+ if (drive->dev_flags & IDE_DFLAG_POST_RESET) {
+ drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC;
+ drive->dev_flags &= ~IDE_DFLAG_POST_RESET;
+ }
+
+ if (!(drive->atapi_flags & IDE_AFLAG_IGNORE_DSC) &&
+ !(stat & ATA_DSC)) {
+ if (!tape->postponed_rq) {
+ 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 (req->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;
+ ide_tape_stall_queue(drive);
+ return ide_stopped;
+ } else {
+ drive->atapi_flags &= ~IDE_AFLAG_IGNORE_DSC;
+ tape->postponed_rq = false;
+ }
+
+ if (req->cmd[13] & REQ_IDETAPE_READ) {
+ pc = &tape->queued_pc;
+ ide_tape_create_rw_cmd(tape, pc, rq, READ_6);
+ goto out;
+ }
+ if (req->cmd[13] & REQ_IDETAPE_WRITE) {
+ pc = &tape->queued_pc;
+ ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6);
+ goto out;
+ }
+ if (req->cmd[13] & REQ_IDETAPE_PC1) {
+ pc = (struct ide_atapi_pc *)rq->special;
+ req->cmd[13] &= ~(REQ_IDETAPE_PC1);
+ req->cmd[13] |= REQ_IDETAPE_PC2;
+ goto out;
+ }
+ if (req->cmd[13] & REQ_IDETAPE_PC2) {
+ idetape_media_access_finished(drive);
+ return ide_stopped;
+ }
+ BUG();
+
+out:
+ /* prepare sense request for this command */
+ ide_prep_sense(drive, rq);
+
+ memset(&cmd, 0, sizeof(cmd));
+
+ if (rq_data_dir(rq))
+ cmd.tf_flags |= IDE_TFLAG_WRITE;
+
+ cmd.rq = rq;
+
+ ide_init_sg_cmd(&cmd, blk_rq_bytes(rq));
+ ide_map_sg(drive, &cmd);
+
+ return ide_tape_issue_pc(drive, &cmd, pc);
+}
+
+/*
+ * 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(ilog2(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, NULL, 0);
+ if (rc)
+ return rc;
+ idetape_wait_ready(drive, 60 * 5 * HZ);
+ return 0;
+}
+
+static int ide_tape_read_position(ide_drive_t *drive)
+{
+ idetape_tape_t *tape = drive->driver_data;
+ struct ide_atapi_pc pc;
+ u8 buf[20];
+
+ ide_debug_log(IDE_DBG_FUNC, "enter");
+
+ /* prep cmd */
+ ide_init_pc(&pc);
+ pc.c[0] = READ_POSITION;
+ pc.req_xfer = 20;
+
+ if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer))
+ return -1;
+
+ if (!pc.error) {
+ ide_debug_log(IDE_DBG_FUNC, "BOP - %s",
+ (buf[0] & 0x80) ? "Yes" : "No");
+ ide_debug_log(IDE_DBG_FUNC, "EOP - %s",
+ (buf[0] & 0x40) ? "Yes" : "No");
+
+ if (buf[0] & 0x4) {
+ printk(KERN_INFO "ide-tape: Block location is unknown"
+ "to the tape\n");
+ clear_bit(ilog2(IDE_AFLAG_ADDRESS_VALID),
+ &drive->atapi_flags);
+ return -1;
+ } else {
+ ide_debug_log(IDE_DBG_FUNC, "Block Location: %u",
+ be32_to_cpup((__be32 *)&buf[4]));
+
+ tape->partition = buf[1];
+ tape->first_frame = be32_to_cpup((__be32 *)&buf[4]);
+ set_bit(ilog2(IDE_AFLAG_ADDRESS_VALID),
+ &drive->atapi_flags);
+ }
+ }
+
+ return tape->first_frame;
+}
+
+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(ilog2(IDE_AFLAG_FILEMARK), &drive->atapi_flags);
+ tape->valid = 0;
+ if (tape->buf != NULL) {
+ kfree(tape->buf);
+ tape->buf = 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 ret;
+ 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);
+ ret = ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
+ if (ret)
+ return ret;
+
+ ret = ide_tape_read_position(drive);
+ if (ret < 0)
+ return ret;
+ return 0;
+}
+
+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 = ide_tape_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 size)
+{
+ idetape_tape_t *tape = drive->driver_data;
+ struct request *rq;
+ int ret;
+
+ ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x, size: %d", cmd, size);
+
+ BUG_ON(cmd != REQ_IDETAPE_READ && cmd != REQ_IDETAPE_WRITE);
+ BUG_ON(size < 0 || size % tape->blk_size);
+
+ rq = blk_get_request(drive->queue, REQ_OP_DRV_IN, 0);
+ ide_req(rq)->type = ATA_PRIV_MISC;
+ scsi_req(rq)->cmd[13] = cmd;
+ rq->rq_disk = tape->disk;
+ rq->__sector = tape->first_frame;
+
+ if (size) {
+ ret = blk_rq_map_kern(drive->queue, rq, tape->buf, size,
+ GFP_NOIO);
+ if (ret)
+ goto out_put;
+ }
+
+ blk_execute_rq(drive->queue, tape->disk, rq, 0);
+
+ /* calculate the number of transferred bytes and update buffer state */
+ size -= scsi_req(rq)->resid_len;
+ tape->cur = tape->buf;
+ if (cmd == REQ_IDETAPE_READ)
+ tape->valid = size;
+ else
+ tape->valid = 0;
+
+ ret = size;
+ if (scsi_req(rq)->result == IDE_DRV_ERROR_GENERAL)
+ ret = -EIO;
+out_put:
+ blk_put_request(rq);
+ 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;
+}
+
+static void ide_tape_flush_merge_buffer(ide_drive_t *drive)
+{
+ idetape_tape_t *tape = drive->driver_data;
+
+ 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->buf) {
+ size_t aligned = roundup(tape->valid, tape->blk_size);
+
+ memset(tape->cur, 0, aligned - tape->valid);
+ idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, aligned);
+ kfree(tape->buf);
+ tape->buf = NULL;
+ }
+ tape->chrdev_dir = IDETAPE_DIR_NONE;
+}
+
+static int idetape_init_rw(ide_drive_t *drive, int dir)
+{
+ idetape_tape_t *tape = drive->driver_data;
+ int rc;
+
+ BUG_ON(dir != IDETAPE_DIR_READ && dir != IDETAPE_DIR_WRITE);
+
+ if (tape->chrdev_dir == dir)
+ return 0;
+
+ if (tape->chrdev_dir == IDETAPE_DIR_READ)
+ ide_tape_discard_merge_buffer(drive, 1);
+ else if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
+ ide_tape_flush_merge_buffer(drive);
+ idetape_flush_tape_buffers(drive);
+ }
+
+ if (tape->buf || tape->valid) {
+ printk(KERN_ERR "ide-tape: valid should be 0 now\n");
+ tape->valid = 0;
+ }
+
+ tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL);
+ if (!tape->buf)
+ return -ENOMEM;
+ tape->chrdev_dir = dir;
+ tape->cur = tape->buf;
+
+ /*
+ * Issue a 0 rw 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) {
+ int cmd = dir == IDETAPE_DIR_READ ? REQ_IDETAPE_READ
+ : REQ_IDETAPE_WRITE;
+
+ rc = idetape_queue_rw_tail(drive, cmd, 0);
+ if (rc < 0) {
+ kfree(tape->buf);
+ tape->buf = NULL;
+ tape->chrdev_dir = IDETAPE_DIR_NONE;
+ return rc;
+ }
+ }
+
+ return 0;
+}
+
+static void idetape_pad_zeros(ide_drive_t *drive, int bcount)
+{
+ idetape_tape_t *tape = drive->driver_data;
+
+ memset(tape->buf, 0, tape->buffer_size);
+
+ while (bcount) {
+ unsigned int count = min(tape->buffer_size, bcount);
+
+ idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, count);
+ bcount -= count;
+ }
+}
+
+/*
+ * 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;
+ struct ide_atapi_pc pc;
+ int ret;
+
+ ide_debug_log(IDE_DBG_FUNC, "enter");
+
+ idetape_create_rewind_cmd(drive, &pc);
+ ret = ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
+ if (ret)
+ return ret;
+
+ ret = ide_tape_read_position(drive);
+ if (ret < 0)
+ return ret;
+ 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;
+
+ ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%04x", cmd);
+
+ 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:
+ memset(&config, 0, sizeof(config));
+ 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);
+
+
+ ide_debug_log(IDE_DBG_FUNC, "mt_op: %d, mt_count: %d", mt_op, mt_count);
+
+ 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->valid = 0;
+ if (test_and_clear_bit(ilog2(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, NULL, 0);
+ 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;
+ size_t done = 0;
+ ssize_t ret = 0;
+ int rc;
+
+ ide_debug_log(IDE_DBG_FUNC, "count %zd", count);
+
+ if (tape->chrdev_dir != IDETAPE_DIR_READ) {
+ if (test_bit(ilog2(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_rw(drive, IDETAPE_DIR_READ);
+ if (rc < 0)
+ return rc;
+
+ while (done < count) {
+ size_t todo;
+
+ /* refill if staging buffer is empty */
+ if (!tape->valid) {
+ /* If we are at a filemark, nothing more to read */
+ if (test_bit(ilog2(IDE_AFLAG_FILEMARK),
+ &drive->atapi_flags))
+ break;
+ /* read */
+ if (idetape_queue_rw_tail(drive, REQ_IDETAPE_READ,
+ tape->buffer_size) <= 0)
+ break;
+ }
+
+ /* copy out */
+ todo = min_t(size_t, count - done, tape->valid);
+ if (copy_to_user(buf + done, tape->cur, todo))
+ ret = -EFAULT;
+
+ tape->cur += todo;
+ tape->valid -= todo;
+ done += todo;
+ }
+
+ if (!done && test_bit(ilog2(IDE_AFLAG_FILEMARK), &drive->atapi_flags)) {
+ idetape_space_over_filemarks(drive, MTFSF, 1);
+ return 0;
+ }
+
+ return ret ? ret : done;
+}
+
+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;
+ size_t done = 0;
+ ssize_t ret = 0;
+ int rc;
+
+ /* The drive is write protected. */
+ if (tape->write_prot)
+ return -EACCES;
+
+ ide_debug_log(IDE_DBG_FUNC, "count %zd", count);
+
+ /* Initialize write operation */
+ rc = idetape_init_rw(drive, IDETAPE_DIR_WRITE);
+ if (rc < 0)
+ return rc;
+
+ while (done < count) {
+ size_t todo;
+
+ /* flush if staging buffer is full */
+ if (tape->valid == tape->buffer_size &&
+ idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE,
+ tape->buffer_size) <= 0)
+ return rc;
+
+ /* copy in */
+ todo = min_t(size_t, count - done,
+ tape->buffer_size - tape->valid);
+ if (copy_from_user(tape->cur, buf + done, todo))
+ ret = -EFAULT;
+
+ tape->cur += todo;
+ tape->valid += todo;
+ done += todo;
+ }
+
+ return ret ? ret : done;
+}
+
+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, NULL, 0)) {
+ 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;
+
+ ide_debug_log(IDE_DBG_FUNC, "MTIOCTOP ioctl: mt_op: %d, mt_count: %d",
+ 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(ilog2(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, NULL, 0);
+ case MTERASE:
+ (void)idetape_rewind_tape(drive);
+ idetape_create_erase_cmd(&pc);
+ return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
+ 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(ilog2(IDE_AFLAG_DETECT_BS),
+ &drive->atapi_flags);
+ } else
+ set_bit(ilog2(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 long do_idetape_chrdev_ioctl(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;
+
+ ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x", 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->valid /
+ (tape->blk_size * tape->user_bs_factor);
+ position = ide_tape_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);
+ }
+}
+
+static long idetape_chrdev_ioctl(struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ long ret;
+ mutex_lock(&ide_tape_mutex);
+ ret = do_idetape_chrdev_ioctl(file, cmd, arg);
+ mutex_unlock(&ide_tape_mutex);
+ return ret;
+}
+
+/*
+ * 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;
+ u8 buf[12];
+
+ idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR);
+ if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer)) {
+ 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 = (buf[4 + 5] << 16) +
+ (buf[4 + 6] << 8) +
+ buf[4 + 7];
+ tape->drv_write_prot = (buf[2] & 0x80) >> 7;
+
+ ide_debug_log(IDE_DBG_FUNC, "blk_size: %d, write_prot: %d",
+ tape->blk_size, tape->drv_write_prot);
+}
+
+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;
+
+ mutex_lock(&idetape_chrdev_mutex);
+
+ tape = ide_tape_get(NULL, true, i);
+ if (!tape) {
+ mutex_unlock(&idetape_chrdev_mutex);
+ return -ENXIO;
+ }
+
+ drive = tape->drive;
+ filp->private_data = tape;
+
+ ide_debug_log(IDE_DBG_FUNC, "enter");
+
+ /*
+ * 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);
+
+
+ if (test_and_set_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags)) {
+ retval = -EBUSY;
+ goto out_put_tape;
+ }
+
+ retval = idetape_wait_ready(drive, 60 * HZ);
+ if (retval) {
+ clear_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags);
+ printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name);
+ goto out_put_tape;
+ }
+
+ ide_tape_read_position(drive);
+ if (!test_bit(ilog2(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(ilog2(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;
+ }
+ }
+ mutex_unlock(&idetape_chrdev_mutex);
+
+ return 0;
+
+out_put_tape:
+ ide_tape_put(tape);
+
+ mutex_unlock(&idetape_chrdev_mutex);
+
+ 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->buf = kmalloc(tape->buffer_size, GFP_KERNEL);
+ if (tape->buf != NULL) {
+ idetape_pad_zeros(drive, tape->blk_size *
+ (tape->user_bs_factor - 1));
+ kfree(tape->buf);
+ tape->buf = 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);
+
+ mutex_lock(&idetape_chrdev_mutex);
+
+ tape = drive->driver_data;
+
+ ide_debug_log(IDE_DBG_FUNC, "enter");
+
+ 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(ilog2(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(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags);
+ ide_tape_put(tape);
+
+ mutex_unlock(&idetape_chrdev_mutex);
+
+ 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);
+ if (ide_queue_pc_tail(drive, tape->disk, &pc, pc_buf, pc.req_xfer)) {
+ 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 buf[24], *caps;
+ u8 speed, max_speed;
+
+ idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
+ if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer)) {
+ 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 = buf + 4 + 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(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(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;
+ u16 *ctl = (u16 *)&tape->caps[12];
+
+ ide_debug_log(IDE_DBG_FUNC, "minor: %d", minor);
+
+ drive->pc_callback = ide_tape_callback;
+
+ 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;
+ }
+
+ /* 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, "
+ "%ums tDSC%s\n",
+ drive->name, tape->name, *(u16 *)&tape->caps[14],
+ (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size,
+ tape->buffer_size / 1024,
+ jiffies_to_msecs(tape->best_dsc_rw_freq),
+ (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->valid);
+
+ 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 idetape_name_proc_show(struct seq_file *m, void *v)
+{
+ ide_drive_t *drive = (ide_drive_t *) m->private;
+ idetape_tape_t *tape = drive->driver_data;
+
+ seq_printf(m, "%s\n", tape->name);
+ return 0;
+}
+
+static ide_proc_entry_t idetape_proc[] = {
+ { "capacity", S_IFREG|S_IRUGO, ide_capacity_proc_show },
+ { "name", S_IFREG|S_IRUGO, idetape_name_proc_show },
+ {}
+};
+
+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,
+ .unlocked_ioctl = idetape_chrdev_ioctl,
+ .open = idetape_chrdev_open,
+ .release = idetape_chrdev_release,
+ .llseek = noop_llseek,
+};
+
+static int idetape_open(struct block_device *bdev, fmode_t mode)
+{
+ struct ide_tape_obj *tape;
+
+ mutex_lock(&ide_tape_mutex);
+ tape = ide_tape_get(bdev->bd_disk, false, 0);
+ mutex_unlock(&ide_tape_mutex);
+
+ if (!tape)
+ return -ENXIO;
+
+ return 0;
+}
+
+static void idetape_release(struct gendisk *disk, fmode_t mode)
+{
+ struct ide_tape_obj *tape = ide_drv_g(disk, ide_tape_obj);
+
+ mutex_lock(&ide_tape_mutex);
+ ide_tape_put(tape);
+ mutex_unlock(&ide_tape_mutex);
+}
+
+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;
+
+ mutex_lock(&ide_tape_mutex);
+ err = generic_ide_ioctl(drive, bdev, cmd, arg);
+ if (err == -EINVAL)
+ err = idetape_blkdev_ioctl(drive, cmd, arg);
+ mutex_unlock(&ide_tape_mutex);
+
+ return err;
+}
+
+static const struct block_device_operations idetape_block_ops = {
+ .owner = THIS_MODULE,
+ .open = idetape_open,
+ .release = idetape_release,
+ .ioctl = idetape_ioctl,
+};
+
+static int ide_tape_probe(ide_drive_t *drive)
+{
+ idetape_tape_t *tape;
+ struct gendisk *g;
+ int minor;
+
+ ide_debug_log(IDE_DBG_FUNC, "enter");
+
+ if (!strstr(DRV_NAME, 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, "%s", 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_chrdev;
+
+ return 0;
+
+out_free_chrdev:
+ unregister_chrdev(IDETAPE_MAJOR, "ht");
+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");