LXR linux/drivers/s390/char/tape

   1/*
   2 *  drivers/s390/char/tape.c
   3 *    tape device driver for S/390 and zSeries tapes.
   4 *
   5 *  S390 and zSeries version
   6 *    Copyright (C) 2001 IBM Corporation
   7 *    Author(s): Carsten Otte <cotte@de.ibm.com>
   8 *               Michael Holzheu <holzheu@de.ibm.com>
   9 *               Tuan Ngo-Anh <ngoanh@de.ibm.com>
  10 *
  11 * PROCFS Functions
  12 */
  13
  14#include <linux/module.h>
  15#include <linux/vmalloc.h>
  16#include <linux/seq_file.h>
  17#include <linux/proc_fs.h>
  18
  19#define TAPE_DBF_AREA   tape_core_dbf
  20
  21#include "tape.h"
  22
  23static const char *tape_med_st_verbose[MS_SIZE] =
  24{
  25        [MS_UNKNOWN] = "UNKNOWN ",
  26        [MS_LOADED] = "LOADED  ",
  27        [MS_UNLOADED] = "UNLOADED"
  28};
  29
  30/* our proc tapedevices entry */
  31static struct proc_dir_entry *tape_proc_devices;
  32
  33/*
  34 * Show function for /proc/tapedevices
  35 */
  36static int tape_proc_show(struct seq_file *m, void *v)
  37{
  38        struct tape_device *device;
  39        struct tape_request *request;
  40        const char *str;
  41        unsigned long n;
  42
  43        n = (unsigned long) v - 1;
  44        if (!n) {
  45                seq_printf(m, "TapeNo\tBusID      CuType/Model\t"
  46                        "DevType/Model\tBlkSize\tState\tOp\tMedState\n");
  47        }
  48        device = tape_get_device(n);
  49        if (IS_ERR(device))
  50                return 0;
  51        spin_lock_irq(get_ccwdev_lock(device->cdev));
  52        seq_printf(m, "%d\t", (int) n);
  53        seq_printf(m, "%-10.10s ", dev_name(&device->cdev->dev));
  54        seq_printf(m, "%04X/", device->cdev->id.cu_type);
  55        seq_printf(m, "%02X\t", device->cdev->id.cu_model);
  56        seq_printf(m, "%04X/", device->cdev->id.dev_type);
  57        seq_printf(m, "%02X\t\t", device->cdev->id.dev_model);
  58        if (device->char_data.block_size == 0)
  59                seq_printf(m, "auto\t");
  60        else
  61                seq_printf(m, "%i\t", device->char_data.block_size);
  62        if (device->tape_state >= 0 &&
  63            device->tape_state < TS_SIZE)
  64                str = tape_state_verbose[device->tape_state];
  65        else
  66                str = "UNKNOWN";
  67        seq_printf(m, "%s\t", str);
  68        if (!list_empty(&device->req_queue)) {
  69                request = list_entry(device->req_queue.next,
  70                                     struct tape_request, list);
  71                str = tape_op_verbose[request->op];
  72        } else
  73                str = "---";
  74        seq_printf(m, "%s\t", str);
  75        seq_printf(m, "%s\n", tape_med_st_verbose[device->medium_state]);
  76        spin_unlock_irq(get_ccwdev_lock(device->cdev));
  77        tape_put_device(device);
  78        return 0;
  79}
  80
  81static void *tape_proc_start(struct seq_file *m, loff_t *pos)
  82{
  83        if (*pos >= 256 / TAPE_MINORS_PER_DEV)
  84                return NULL;
  85        return (void *)((unsigned long) *pos + 1);
  86}
  87
  88static void *tape_proc_next(struct seq_file *m, void *v, loff_t *pos)
  89{
  90        ++*pos;
  91        return tape_proc_start(m, pos);
  92}
  93
  94static void tape_proc_stop(struct seq_file *m, void *v)
  95{
  96}
  97
  98static const struct seq_operations tape_proc_seq = {
  99        .start          = tape_proc_start,
 100        .next           = tape_proc_next,
 101        .stop           = tape_proc_stop,
 102        .show           = tape_proc_show,
 103};
 104
 105static int tape_proc_open(struct inode *inode, struct file *file)
 106{
 107        return seq_open(file, &tape_proc_seq);
 108}
 109
 110static const struct file_operations tape_proc_ops =
 111{
 112        .owner          = THIS_MODULE,
 113        .open           = tape_proc_open,
 114        .read           = seq_read,
 115        .llseek         = seq_lseek,
 116        .release        = seq_release,
 117};
 118
 119/*
 120 * Initialize procfs stuff on startup
 121 */
 122void
 123tape_proc_init(void)
 124{
 125        tape_proc_devices =
 126                proc_create("tapedevices", S_IFREG | S_IRUGO | S_IWUSR, NULL,
 127                            &tape_proc_ops);
 128        if (tape_proc_devices == NULL) {
 129                return;
 130        }
 131}
 132
 133/*
 134 * Cleanup all stuff registered to the procfs
 135 */
 136void
 137tape_proc_cleanup(void)
 138{
 139        if (tape_proc_devices != NULL)
 140                remove_proc_entry ("tapedevices", NULL);
 141}
 142