LXR linux/drivers/s390/char/tape

   1/*
   2 *    tape device driver for S/390 and zSeries tapes.
   3 *
   4 *  S390 and zSeries version
   5 *    Copyright IBM Corp. 2001
   6 *    Author(s): Carsten Otte <cotte@de.ibm.com>
   7 *               Michael Holzheu <holzheu@de.ibm.com>
   8 *               Tuan Ngo-Anh <ngoanh@de.ibm.com>
   9 *
  10 * PROCFS Functions
  11 */
  12
  13#define KMSG_COMPONENT "tape"
  14#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  15
  16#include <linux/module.h>
  17#include <linux/vmalloc.h>
  18#include <linux/seq_file.h>
  19#include <linux/proc_fs.h>
  20
  21#define TAPE_DBF_AREA   tape_core_dbf
  22
  23#include "tape.h"
  24
  25static const char *tape_med_st_verbose[MS_SIZE] =
  26{
  27        [MS_UNKNOWN] = "UNKNOWN ",
  28        [MS_LOADED] = "LOADED  ",
  29        [MS_UNLOADED] = "UNLOADED"
  30};
  31
  32/* our proc tapedevices entry */
  33static struct proc_dir_entry *tape_proc_devices;
  34
  35/*
  36 * Show function for /proc/tapedevices
  37 */
  38static int tape_proc_show(struct seq_file *m, void *v)
  39{
  40        struct tape_device *device;
  41        struct tape_request *request;
  42        const char *str;
  43        unsigned long n;
  44
  45        n = (unsigned long) v - 1;
  46        if (!n) {
  47                seq_printf(m, "TapeNo\tBusID      CuType/Model\t"
  48                        "DevType/Model\tBlkSize\tState\tOp\tMedState\n");
  49        }
  50        device = tape_find_device(n);
  51        if (IS_ERR(device))
  52                return 0;
  53        spin_lock_irq(get_ccwdev_lock(device->cdev));
  54        seq_printf(m, "%d\t", (int) n);
  55        seq_printf(m, "%-10.10s ", dev_name(&device->cdev->dev));
  56        seq_printf(m, "%04X/", device->cdev->id.cu_type);
  57        seq_printf(m, "%02X\t", device->cdev->id.cu_model);
  58        seq_printf(m, "%04X/", device->cdev->id.dev_type);
  59        seq_printf(m, "%02X\t\t", device->cdev->id.dev_model);
  60        if (device->char_data.block_size == 0)
  61                seq_printf(m, "auto\t");
  62        else
  63                seq_printf(m, "%i\t", device->char_data.block_size);
  64        if (device->tape_state >= 0 &&
  65            device->tape_state < TS_SIZE)
  66                str = tape_state_verbose[device->tape_state];
  67        else
  68                str = "UNKNOWN";
  69        seq_printf(m, "%s\t", str);
  70        if (!list_empty(&device->req_queue)) {
  71                request = list_entry(device->req_queue.next,
  72                                     struct tape_request, list);
  73                str = tape_op_verbose[request->op];
  74        } else
  75                str = "---";
  76        seq_printf(m, "%s\t", str);
  77        seq_printf(m, "%s\n", tape_med_st_verbose[device->medium_state]);
  78        spin_unlock_irq(get_ccwdev_lock(device->cdev));
  79        tape_put_device(device);
  80        return 0;
  81}
  82
  83static void *tape_proc_start(struct seq_file *m, loff_t *pos)
  84{
  85        if (*pos >= 256 / TAPE_MINORS_PER_DEV)
  86                return NULL;
  87        return (void *)((unsigned long) *pos + 1);
  88}
  89
  90static void *tape_proc_next(struct seq_file *m, void *v, loff_t *pos)
  91{
  92        ++*pos;
  93        return tape_proc_start(m, pos);
  94}
  95
  96static void tape_proc_stop(struct seq_file *m, void *v)
  97{
  98}
  99
 100static const struct seq_operations tape_proc_seq = {
 101        .start          = tape_proc_start,
 102        .next           = tape_proc_next,
 103        .stop           = tape_proc_stop,
 104        .show           = tape_proc_show,
 105};
 106
 107static int tape_proc_open(struct inode *inode, struct file *file)
 108{
 109        return seq_open(file, &tape_proc_seq);
 110}
 111
 112static const struct file_operations tape_proc_ops =
 113{
 114        .owner          = THIS_MODULE,
 115        .open           = tape_proc_open,
 116        .read           = seq_read,
 117        .llseek         = seq_lseek,
 118        .release        = seq_release,
 119};
 120
 121/*
 122 * Initialize procfs stuff on startup
 123 */
 124void
 125tape_proc_init(void)
 126{
 127        tape_proc_devices =
 128                proc_create("tapedevices", S_IFREG | S_IRUGO | S_IWUSR, NULL,
 129                            &tape_proc_ops);
 130        if (tape_proc_devices == NULL) {
 131                return;
 132        }
 133}
 134
 135/*
 136 * Cleanup all stuff registered to the procfs
 137 */
 138void
 139tape_proc_cleanup(void)
 140{
 141        if (tape_proc_devices != NULL)
 142                remove_proc_entry ("tapedevices", NULL);
 143}
 144