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2083 lines
56 KiB
2083 lines
56 KiB
/* |
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* IDE ATAPI streaming tape driver. |
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* |
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* Copyright (C) 1995-1999 Gadi Oxman <[email protected]> |
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* Copyright (C) 2003-2005 Bartlomiej Zolnierkiewicz |
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* |
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* This driver was constructed as a student project in the software laboratory |
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* of the faculty of electrical engineering in the Technion - Israel's |
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* Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David. |
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* |
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* It is hereby placed under the terms of the GNU general public license. |
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* (See linux/COPYING). |
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* |
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* For a historical changelog see |
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* Documentation/ide/ChangeLog.ide-tape.1995-2002 |
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*/ |
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|
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#define DRV_NAME "ide-tape" |
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|
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#define IDETAPE_VERSION "1.20" |
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|
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#include <linux/compat.h> |
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#include <linux/module.h> |
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#include <linux/types.h> |
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#include <linux/string.h> |
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#include <linux/kernel.h> |
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#include <linux/delay.h> |
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#include <linux/timer.h> |
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#include <linux/mm.h> |
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#include <linux/interrupt.h> |
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#include <linux/jiffies.h> |
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#include <linux/major.h> |
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#include <linux/errno.h> |
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#include <linux/genhd.h> |
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#include <linux/seq_file.h> |
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#include <linux/slab.h> |
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#include <linux/pci.h> |
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#include <linux/ide.h> |
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#include <linux/completion.h> |
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#include <linux/bitops.h> |
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#include <linux/mutex.h> |
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#include <scsi/scsi.h> |
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|
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#include <asm/byteorder.h> |
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#include <linux/uaccess.h> |
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#include <linux/io.h> |
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#include <asm/unaligned.h> |
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#include <linux/mtio.h> |
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|
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/* define to see debug info */ |
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#undef IDETAPE_DEBUG_LOG |
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|
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#ifdef IDETAPE_DEBUG_LOG |
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#define ide_debug_log(lvl, fmt, args...) __ide_debug_log(lvl, fmt, ## args) |
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#else |
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#define ide_debug_log(lvl, fmt, args...) do {} while (0) |
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#endif |
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|
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/**************************** Tunable parameters *****************************/ |
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/* |
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* After each failed packet command we issue a request sense command and retry |
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* the packet command IDETAPE_MAX_PC_RETRIES times. |
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* |
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* Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries. |
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*/ |
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#define IDETAPE_MAX_PC_RETRIES 3 |
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|
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/* |
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* The following parameter is used to select the point in the internal tape fifo |
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* in which we will start to refill the buffer. Decreasing the following |
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* parameter will improve the system's latency and interactive response, while |
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* using a high value might improve system throughput. |
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*/ |
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#define IDETAPE_FIFO_THRESHOLD 2 |
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|
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/* |
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* DSC polling parameters. |
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* |
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* Polling for DSC (a single bit in the status register) is a very important |
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* function in ide-tape. There are two cases in which we poll for DSC: |
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* |
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* 1. Before a read/write packet command, to ensure that we can transfer data |
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* from/to the tape's data buffers, without causing an actual media access. |
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* In case the tape is not ready yet, we take out our request from the device |
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* request queue, so that ide.c could service requests from the other device |
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* on the same interface in the meantime. |
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* |
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* 2. After the successful initialization of a "media access packet command", |
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* which is a command that can take a long time to complete (the interval can |
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* range from several seconds to even an hour). Again, we postpone our request |
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* in the middle to free the bus for the other device. The polling frequency |
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* here should be lower than the read/write frequency since those media access |
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* commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST |
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* (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD |
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* (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min). |
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* |
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* We also set a timeout for the timer, in case something goes wrong. The |
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* timeout should be longer then the maximum execution time of a tape operation. |
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*/ |
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|
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/* DSC timings. */ |
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#define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */ |
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#define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */ |
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#define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */ |
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#define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */ |
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#define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */ |
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#define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */ |
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#define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */ |
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|
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/*************************** End of tunable parameters ***********************/ |
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|
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/* tape directions */ |
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enum { |
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IDETAPE_DIR_NONE = (1 << 0), |
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IDETAPE_DIR_READ = (1 << 1), |
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IDETAPE_DIR_WRITE = (1 << 2), |
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}; |
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|
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/* Tape door status */ |
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#define DOOR_UNLOCKED 0 |
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#define DOOR_LOCKED 1 |
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#define DOOR_EXPLICITLY_LOCKED 2 |
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|
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/* Some defines for the SPACE command */ |
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#define IDETAPE_SPACE_OVER_FILEMARK 1 |
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#define IDETAPE_SPACE_TO_EOD 3 |
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|
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/* Some defines for the LOAD UNLOAD command */ |
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#define IDETAPE_LU_LOAD_MASK 1 |
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#define IDETAPE_LU_RETENSION_MASK 2 |
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#define IDETAPE_LU_EOT_MASK 4 |
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|
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/* Structures related to the SELECT SENSE / MODE SENSE packet commands. */ |
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#define IDETAPE_BLOCK_DESCRIPTOR 0 |
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#define IDETAPE_CAPABILITIES_PAGE 0x2a |
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|
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/* |
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* Most of our global data which we need to save even as we leave the driver due |
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* to an interrupt or a timer event is stored in the struct defined below. |
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*/ |
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typedef struct ide_tape_obj { |
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ide_drive_t *drive; |
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struct ide_driver *driver; |
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struct gendisk *disk; |
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struct device dev; |
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|
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/* used by REQ_IDETAPE_{READ,WRITE} requests */ |
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struct ide_atapi_pc queued_pc; |
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|
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/* |
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* DSC polling variables. |
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* |
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* While polling for DSC we use postponed_rq to postpone the current |
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* request so that ide.c will be able to service pending requests on the |
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* other device. Note that at most we will have only one DSC (usually |
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* data transfer) request in the device request queue. |
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*/ |
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bool postponed_rq; |
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|
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/* The time in which we started polling for DSC */ |
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unsigned long dsc_polling_start; |
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/* Timer used to poll for dsc */ |
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struct timer_list dsc_timer; |
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/* Read/Write dsc polling frequency */ |
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unsigned long best_dsc_rw_freq; |
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unsigned long dsc_poll_freq; |
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unsigned long dsc_timeout; |
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|
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/* Read position information */ |
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u8 partition; |
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/* Current block */ |
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unsigned int first_frame; |
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/* Last error information */ |
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u8 sense_key, asc, ascq; |
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|
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/* Character device operation */ |
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unsigned int minor; |
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/* device name */ |
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char name[4]; |
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/* Current character device data transfer direction */ |
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u8 chrdev_dir; |
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|
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/* tape block size, usually 512 or 1024 bytes */ |
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unsigned short blk_size; |
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int user_bs_factor; |
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|
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/* Copy of the tape's Capabilities and Mechanical Page */ |
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u8 caps[20]; |
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|
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/* |
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* Active data transfer request parameters. |
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* |
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* At most, there is only one ide-tape originated data transfer request |
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* in the device request queue. This allows ide.c to easily service |
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* requests from the other device when we postpone our active request. |
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*/ |
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|
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/* Data buffer size chosen based on the tape's recommendation */ |
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int buffer_size; |
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/* Staging buffer of buffer_size bytes */ |
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void *buf; |
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/* The read/write cursor */ |
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void *cur; |
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/* The number of valid bytes in buf */ |
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size_t valid; |
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|
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/* Measures average tape speed */ |
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unsigned long avg_time; |
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int avg_size; |
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int avg_speed; |
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/* the door is currently locked */ |
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int door_locked; |
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/* the tape hardware is write protected */ |
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char drv_write_prot; |
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/* the tape is write protected (hardware or opened as read-only) */ |
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char write_prot; |
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} idetape_tape_t; |
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static DEFINE_MUTEX(ide_tape_mutex); |
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static DEFINE_MUTEX(idetape_ref_mutex); |
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static DEFINE_MUTEX(idetape_chrdev_mutex); |
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static struct class *idetape_sysfs_class; |
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static void ide_tape_release(struct device *); |
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static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES]; |
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static struct ide_tape_obj *ide_tape_get(struct gendisk *disk, bool cdev, |
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unsigned int i) |
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{ |
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struct ide_tape_obj *tape = NULL; |
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mutex_lock(&idetape_ref_mutex); |
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if (cdev) |
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tape = idetape_devs[i]; |
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else |
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tape = ide_drv_g(disk, ide_tape_obj); |
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|
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if (tape) { |
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if (ide_device_get(tape->drive)) |
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tape = NULL; |
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else |
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get_device(&tape->dev); |
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} |
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mutex_unlock(&idetape_ref_mutex); |
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return tape; |
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} |
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static void ide_tape_put(struct ide_tape_obj *tape) |
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{ |
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ide_drive_t *drive = tape->drive; |
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mutex_lock(&idetape_ref_mutex); |
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put_device(&tape->dev); |
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ide_device_put(drive); |
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mutex_unlock(&idetape_ref_mutex); |
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} |
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/* |
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* called on each failed packet command retry to analyze the request sense. We |
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* currently do not utilize this information. |
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*/ |
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static void idetape_analyze_error(ide_drive_t *drive) |
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{ |
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idetape_tape_t *tape = drive->driver_data; |
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struct ide_atapi_pc *pc = drive->failed_pc; |
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struct request *rq = drive->hwif->rq; |
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u8 *sense = bio_data(rq->bio); |
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tape->sense_key = sense[2] & 0xF; |
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tape->asc = sense[12]; |
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tape->ascq = sense[13]; |
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ide_debug_log(IDE_DBG_FUNC, |
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"cmd: 0x%x, sense key = %x, asc = %x, ascq = %x", |
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rq->cmd[0], tape->sense_key, tape->asc, tape->ascq); |
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|
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/* correct remaining bytes to transfer */ |
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if (pc->flags & PC_FLAG_DMA_ERROR) |
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scsi_req(rq)->resid_len = tape->blk_size * get_unaligned_be32(&sense[3]); |
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/* |
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* If error was the result of a zero-length read or write command, |
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* with sense key=5, asc=0x22, ascq=0, let it slide. Some drives |
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* (i.e. Seagate STT3401A Travan) don't support 0-length read/writes. |
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*/ |
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if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6) |
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/* length == 0 */ |
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&& pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { |
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if (tape->sense_key == 5) { |
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/* don't report an error, everything's ok */ |
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pc->error = 0; |
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/* don't retry read/write */ |
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pc->flags |= PC_FLAG_ABORT; |
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} |
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} |
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if (pc->c[0] == READ_6 && (sense[2] & 0x80)) { |
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pc->error = IDE_DRV_ERROR_FILEMARK; |
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pc->flags |= PC_FLAG_ABORT; |
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} |
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if (pc->c[0] == WRITE_6) { |
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if ((sense[2] & 0x40) || (tape->sense_key == 0xd |
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&& tape->asc == 0x0 && tape->ascq == 0x2)) { |
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pc->error = IDE_DRV_ERROR_EOD; |
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pc->flags |= PC_FLAG_ABORT; |
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} |
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} |
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if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { |
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if (tape->sense_key == 8) { |
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pc->error = IDE_DRV_ERROR_EOD; |
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pc->flags |= PC_FLAG_ABORT; |
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} |
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if (!(pc->flags & PC_FLAG_ABORT) && |
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(blk_rq_bytes(rq) - scsi_req(rq)->resid_len)) |
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pc->retries = IDETAPE_MAX_PC_RETRIES + 1; |
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} |
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} |
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static void ide_tape_handle_dsc(ide_drive_t *); |
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static int ide_tape_callback(ide_drive_t *drive, int dsc) |
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{ |
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idetape_tape_t *tape = drive->driver_data; |
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struct ide_atapi_pc *pc = drive->pc; |
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struct request *rq = drive->hwif->rq; |
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int uptodate = pc->error ? 0 : 1; |
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int err = uptodate ? 0 : IDE_DRV_ERROR_GENERAL; |
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ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x, dsc: %d, err: %d", rq->cmd[0], |
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dsc, err); |
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if (dsc) |
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ide_tape_handle_dsc(drive); |
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if (drive->failed_pc == pc) |
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drive->failed_pc = NULL; |
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if (pc->c[0] == REQUEST_SENSE) { |
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if (uptodate) |
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idetape_analyze_error(drive); |
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else |
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printk(KERN_ERR "ide-tape: Error in REQUEST SENSE " |
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"itself - Aborting request!\n"); |
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} else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { |
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unsigned int blocks = |
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(blk_rq_bytes(rq) - scsi_req(rq)->resid_len) / tape->blk_size; |
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tape->avg_size += blocks * tape->blk_size; |
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|
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if (time_after_eq(jiffies, tape->avg_time + HZ)) { |
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tape->avg_speed = tape->avg_size * HZ / |
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(jiffies - tape->avg_time) / 1024; |
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tape->avg_size = 0; |
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tape->avg_time = jiffies; |
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} |
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tape->first_frame += blocks; |
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if (pc->error) { |
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uptodate = 0; |
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err = pc->error; |
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} |
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} |
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scsi_req(rq)->result = err; |
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|
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return uptodate; |
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} |
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|
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/* |
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* Postpone the current request so that ide.c will be able to service requests |
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* from another device on the same port while we are polling for DSC. |
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*/ |
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static void ide_tape_stall_queue(ide_drive_t *drive) |
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{ |
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idetape_tape_t *tape = drive->driver_data; |
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|
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ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x, dsc_poll_freq: %lu", |
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drive->hwif->rq->cmd[0], tape->dsc_poll_freq); |
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tape->postponed_rq = true; |
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ide_stall_queue(drive, tape->dsc_poll_freq); |
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} |
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static void ide_tape_handle_dsc(ide_drive_t *drive) |
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{ |
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idetape_tape_t *tape = drive->driver_data; |
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|
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/* Media access command */ |
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tape->dsc_polling_start = jiffies; |
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tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST; |
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tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; |
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/* Allow ide.c to handle other requests */ |
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ide_tape_stall_queue(drive); |
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} |
|
|
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/* |
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* Packet Command Interface |
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* |
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* The current Packet Command is available in drive->pc, and will not change |
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* until we finish handling it. Each packet command is associated with a |
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* callback function that will be called when the command is finished. |
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* |
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* The handling will be done in three stages: |
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* |
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* 1. ide_tape_issue_pc will send the packet command to the drive, and will set |
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* the interrupt handler to ide_pc_intr. |
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* |
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* 2. On each interrupt, ide_pc_intr will be called. This step will be |
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* repeated until the device signals us that no more interrupts will be issued. |
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* |
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* 3. ATAPI Tape media access commands have immediate status with a delayed |
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* process. In case of a successful initiation of a media access packet command, |
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* the DSC bit will be set when the actual execution of the command is finished. |
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* Since the tape drive will not issue an interrupt, we have to poll for this |
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* event. In this case, we define the request as "low priority request" by |
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* setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and |
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* exit the driver. |
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* |
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* ide.c will then give higher priority to requests which originate from the |
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* other device, until will change rq_status to RQ_ACTIVE. |
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* |
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* 4. When the packet command is finished, it will be checked for errors. |
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* |
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* 5. In case an error was found, we queue a request sense packet command in |
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* front of the request queue and retry the operation up to |
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* IDETAPE_MAX_PC_RETRIES times. |
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* |
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* 6. In case no error was found, or we decided to give up and not to retry |
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* again, the callback function will be called and then we will handle the next |
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* request. |
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*/ |
|
|
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static ide_startstop_t ide_tape_issue_pc(ide_drive_t *drive, |
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struct ide_cmd *cmd, |
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struct ide_atapi_pc *pc) |
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{ |
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idetape_tape_t *tape = drive->driver_data; |
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struct request *rq = drive->hwif->rq; |
|
|
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if (drive->failed_pc == NULL && pc->c[0] != REQUEST_SENSE) |
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drive->failed_pc = pc; |
|
|
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/* Set the current packet command */ |
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drive->pc = pc; |
|
|
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if (pc->retries > IDETAPE_MAX_PC_RETRIES || |
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(pc->flags & PC_FLAG_ABORT)) { |
|
|
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/* |
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* We will "abort" retrying a packet command in case legitimate |
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* error code was received (crossing a filemark, or end of the |
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* media, for example). |
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*/ |
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if (!(pc->flags & PC_FLAG_ABORT)) { |
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if (!(pc->c[0] == TEST_UNIT_READY && |
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tape->sense_key == 2 && tape->asc == 4 && |
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(tape->ascq == 1 || tape->ascq == 8))) { |
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printk(KERN_ERR "ide-tape: %s: I/O error, " |
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"pc = %2x, key = %2x, " |
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"asc = %2x, ascq = %2x\n", |
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tape->name, pc->c[0], |
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tape->sense_key, tape->asc, |
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tape->ascq); |
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} |
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/* Giving up */ |
|
pc->error = IDE_DRV_ERROR_GENERAL; |
|
} |
|
|
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drive->failed_pc = NULL; |
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drive->pc_callback(drive, 0); |
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ide_complete_rq(drive, BLK_STS_IOERR, blk_rq_bytes(rq)); |
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return ide_stopped; |
|
} |
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ide_debug_log(IDE_DBG_SENSE, "retry #%d, cmd: 0x%02x", pc->retries, |
|
pc->c[0]); |
|
|
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pc->retries++; |
|
|
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return ide_issue_pc(drive, cmd); |
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} |
|
|
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/* 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; |
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pc->c[2] = page_code; |
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/* |
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* Changed pc->c[3] to 0 (255 will at best return unused info). |
|
* |
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* For SCSI this byte is defined as subpage instead of high byte |
|
* of length and some IDE drives seem to interpret it this way |
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* and return an error when 255 is used. |
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*/ |
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pc->c[3] = 0; |
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/* We will just discard data in that case */ |
|
pc->c[4] = 255; |
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if (page_code == IDETAPE_BLOCK_DESCRIPTOR) |
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pc->req_xfer = 12; |
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else if (page_code == IDETAPE_CAPABILITIES_PAGE) |
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pc->req_xfer = 24; |
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else |
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pc->req_xfer = 50; |
|
} |
|
|
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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; |
|
|
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stat = hwif->tp_ops->read_status(hwif); |
|
|
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if (stat & ATA_DSC) { |
|
if (stat & ATA_ERR) { |
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/* Error detected */ |
|
if (pc->c[0] != TEST_UNIT_READY) |
|
printk(KERN_ERR "ide-tape: %s: I/O error, ", |
|
tape->name); |
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/* 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 *)ide_req(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(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); |
|
|
|
return put_user_mtget(argp, &mtget); |
|
case MTIOCPOS: |
|
mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; |
|
return put_user_mtpos(argp, &mtpos); |
|
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; |
|
} |
|
|
|
static long idetape_chrdev_compat_ioctl(struct file *file, |
|
unsigned int cmd, unsigned long arg) |
|
{ |
|
long ret; |
|
|
|
if (cmd == MTIOCPOS32) |
|
cmd = MTIOCPOS; |
|
else if (cmd == MTIOCGET32) |
|
cmd = MTIOCGET; |
|
|
|
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); |
|
|
|
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, |
|
.compat_ioctl = IS_ENABLED(CONFIG_COMPAT) ? |
|
idetape_chrdev_compat_ioctl : NULL, |
|
.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 int idetape_compat_ioctl(struct block_device *bdev, fmode_t mode, |
|
unsigned int cmd, unsigned long arg) |
|
{ |
|
if (cmd == 0x0340 || cmd == 0x350) |
|
arg = (unsigned long)compat_ptr(arg); |
|
|
|
return idetape_ioctl(bdev, mode, cmd, arg); |
|
} |
|
|
|
static const struct block_device_operations idetape_block_ops = { |
|
.owner = THIS_MODULE, |
|
.open = idetape_open, |
|
.release = idetape_release, |
|
.ioctl = idetape_ioctl, |
|
.compat_ioctl = IS_ENABLED(CONFIG_COMPAT) ? |
|
idetape_compat_ioctl : NULL, |
|
}; |
|
|
|
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; |
|
|
|
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");
|
|
|