| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Jens Axboe | 2645 | 28.28% | 2 | 1.03% |
| Andrew Morton | 2138 | 22.86% | 3 | 1.54% |
| Borislav Petkov | 1677 | 17.93% | 55 | 28.21% |
| Bartlomiej Zolnierkiewicz | 1479 | 15.81% | 65 | 33.33% |
| Tejun Heo | 464 | 4.96% | 12 | 6.15% |
| Al Viro | 252 | 2.69% | 10 | 5.13% |
| Will Dyson | 149 | 1.59% | 1 | 0.51% |
| Christoph Hellwig | 84 | 0.90% | 9 | 4.62% |
| Elias Oltmanns | 84 | 0.90% | 1 | 0.51% |
| Arnd Bergmann | 66 | 0.71% | 4 | 2.05% |
| Alan Cox | 41 | 0.44% | 1 | 0.51% |
| Daniel Walker | 40 | 0.43% | 1 | 0.51% |
| FUJITA Tomonori | 37 | 0.40% | 1 | 0.51% |
| Harvey Harrison | 29 | 0.31% | 3 | 1.54% |
| Art Haas | 27 | 0.29% | 1 | 0.51% |
| Alexey Dobriyan | 21 | 0.22% | 3 | 1.54% |
| Arjan van de Ven | 18 | 0.19% | 2 | 1.03% |
| Alan Stern | 15 | 0.16% | 1 | 0.51% |
| Michael Buesch | 13 | 0.14% | 1 | 0.51% |
| Tony Jones | 10 | 0.11% | 1 | 0.51% |
| Marcelo Feitoza Parisi | 8 | 0.09% | 1 | 0.51% |
| Greg Kroah-Hartman | 8 | 0.09% | 3 | 1.54% |
| Russell King | 7 | 0.07% | 1 | 0.51% |
| Mark de Wever | 6 | 0.06% | 2 | 1.03% |
| Alexey Khoroshilov | 6 | 0.06% | 1 | 0.51% |
| Jonathan Corbet | 6 | 0.06% | 1 | 0.51% |
| Kay Sievers | 5 | 0.05% | 1 | 0.51% |
| Nicholas Mc Guire | 4 | 0.04% | 1 | 0.51% |
| Laurent Riffard | 4 | 0.04% | 1 | 0.51% |
| Adrian Bunk | 3 | 0.03% | 1 | 0.51% |
| Nishanth Aravamudan | 2 | 0.02% | 1 | 0.51% |
| Kees Cook | 2 | 0.02% | 1 | 0.51% |
| Deepak Saxena | 1 | 0.01% | 1 | 0.51% |
| Hannes Eder | 1 | 0.01% | 1 | 0.51% |
| Linus Torvalds | 1 | 0.01% | 1 | 0.51% |
| Total | 9353 | 195 |
/* * 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");
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