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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 | // SPDX-License-Identifier: GPL-2.0 /* * tape device driver for S/390 and zSeries tapes. * * S390 and zSeries version * Copyright IBM Corp. 2001 * Author(s): Carsten Otte <cotte@de.ibm.com> * Michael Holzheu <holzheu@de.ibm.com> * Tuan Ngo-Anh <ngoanh@de.ibm.com> * * PROCFS Functions */ #define KMSG_COMPONENT "tape" #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt #include <linux/module.h> #include <linux/vmalloc.h> #include <linux/seq_file.h> #include <linux/proc_fs.h> #define TAPE_DBF_AREA tape_core_dbf #include "tape.h" static const char *tape_med_st_verbose[MS_SIZE] = { [MS_UNKNOWN] = "UNKNOWN ", [MS_LOADED] = "LOADED ", [MS_UNLOADED] = "UNLOADED" }; /* our proc tapedevices entry */ static struct proc_dir_entry *tape_proc_devices; /* * Show function for /proc/tapedevices */ static int tape_proc_show(struct seq_file *m, void *v) { struct tape_device *device; struct tape_request *request; const char *str; unsigned long n; n = (unsigned long) v - 1; if (!n) { seq_printf(m, "TapeNo\tBusID CuType/Model\t" "DevType/Model\tBlkSize\tState\tOp\tMedState\n"); } device = tape_find_device(n); if (IS_ERR(device)) return 0; spin_lock_irq(get_ccwdev_lock(device->cdev)); seq_printf(m, "%d\t", (int) n); seq_printf(m, "%-10.10s ", dev_name(&device->cdev->dev)); seq_printf(m, "%04X/", device->cdev->id.cu_type); seq_printf(m, "%02X\t", device->cdev->id.cu_model); seq_printf(m, "%04X/", device->cdev->id.dev_type); seq_printf(m, "%02X\t\t", device->cdev->id.dev_model); if (device->char_data.block_size == 0) seq_printf(m, "auto\t"); else seq_printf(m, "%i\t", device->char_data.block_size); if (device->tape_state >= 0 && device->tape_state < TS_SIZE) str = tape_state_verbose[device->tape_state]; else str = "UNKNOWN"; seq_printf(m, "%s\t", str); if (!list_empty(&device->req_queue)) { request = list_entry(device->req_queue.next, struct tape_request, list); str = tape_op_verbose[request->op]; } else str = "---"; seq_printf(m, "%s\t", str); seq_printf(m, "%s\n", tape_med_st_verbose[device->medium_state]); spin_unlock_irq(get_ccwdev_lock(device->cdev)); tape_put_device(device); return 0; } static void *tape_proc_start(struct seq_file *m, loff_t *pos) { if (*pos >= 256 / TAPE_MINORS_PER_DEV) return NULL; return (void *)((unsigned long) *pos + 1); } static void *tape_proc_next(struct seq_file *m, void *v, loff_t *pos) { ++*pos; return tape_proc_start(m, pos); } static void tape_proc_stop(struct seq_file *m, void *v) { } static const struct seq_operations tape_proc_seq = { .start = tape_proc_start, .next = tape_proc_next, .stop = tape_proc_stop, .show = tape_proc_show, }; /* * Initialize procfs stuff on startup */ void tape_proc_init(void) { tape_proc_devices = proc_create_seq("tapedevices", S_IFREG | S_IRUGO | S_IWUSR, NULL, &tape_proc_seq); if (tape_proc_devices == NULL) { return; } } /* * Cleanup all stuff registered to the procfs */ void tape_proc_cleanup(void) { if (tape_proc_devices != NULL) remove_proc_entry ("tapedevices", NULL); } |