drivers/s390/char/tape_proc.c

   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/config.h>
  15 #include <linux/module.h>
  16 #include <linux/vmalloc.h>
  17 #include <linux/seq_file.h>
  18
  19 #include "tape.h"
  20
  21 #define PRINTK_HEADER "TAPE_PROC: "
  22
  23 static 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 */
  31 static struct proc_dir_entry *tape_proc_devices;
  32
  33 /*
  34  * Show function for /proc/tapedevices
  35  */
  36 static 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 ", device->cdev->dev.bus_id);
  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
  81 static 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
  88 static 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
  94 static void tape_proc_stop(struct seq_file *m, void *v)
  95 {
  96 }
  97
  98 static 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
 105 static int tape_proc_open(struct inode *inode, struct file *file)
 106 {
 107         return seq_open(file, &tape_proc_seq);
 108 }
 109
 110 static struct file_operations tape_proc_ops =
 111 {
 112         .open           = tape_proc_open,
 113         .read           = seq_read,
 114         .llseek         = seq_lseek,
 115         .release        = seq_release,
 116 };
 117
 118 /*
 119  * Initialize procfs stuff on startup
 120  */
 121 void
 122 tape_proc_init(void)
 123 {
 124         tape_proc_devices =
 125                 create_proc_entry ("tapedevices", S_IFREG | S_IRUGO | S_IWUSR,
 126                                    &proc_root);
 127         if (tape_proc_devices == NULL) {
 128                 PRINT_WARN("tape: Cannot register procfs entry tapedevices\n");
 129                 return;
 130         }
 131         tape_proc_devices->proc_fops = &tape_proc_ops;
 132         tape_proc_devices->owner = THIS_MODULE;
 133 }
 134
 135 /*
 136  * Cleanup all stuff registered to the procfs
 137  */
 138 void
 139 tape_proc_cleanup(void)
 140 {
 141         if (tape_proc_devices != NULL)
 142                 remove_proc_entry ("tapedevices", &proc_root);
 143 }