^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * character device frontend for tape device driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * S390 and zSeries version
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright IBM Corp. 2001, 2006
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Author(s): Carsten Otte <cotte@de.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Michael Holzheu <holzheu@de.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Tuan Ngo-Anh <ngoanh@de.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * Martin Schwidefsky <schwidefsky@de.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #define KMSG_COMPONENT "tape"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/proc_fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/mtio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/compat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define TAPE_DBF_AREA tape_core_dbf
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include "tape.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include "tape_std.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include "tape_class.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #define TAPECHAR_MAJOR 0 /* get dynamic major */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * file operation structure for tape character frontend
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) static ssize_t tapechar_read(struct file *, char __user *, size_t, loff_t *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) static ssize_t tapechar_write(struct file *, const char __user *, size_t, loff_t *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) static int tapechar_open(struct inode *,struct file *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) static int tapechar_release(struct inode *,struct file *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) static long tapechar_ioctl(struct file *, unsigned int, unsigned long);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #ifdef CONFIG_COMPAT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) static long tapechar_compat_ioctl(struct file *, unsigned int, unsigned long);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) static const struct file_operations tape_fops =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) .read = tapechar_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) .write = tapechar_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) .unlocked_ioctl = tapechar_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) #ifdef CONFIG_COMPAT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) .compat_ioctl = tapechar_compat_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) .open = tapechar_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) .release = tapechar_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) .llseek = no_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) static int tapechar_major = TAPECHAR_MAJOR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * This function is called for every new tapedevice
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) tapechar_setup_device(struct tape_device * device)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) char device_name[20];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) sprintf(device_name, "ntibm%i", device->first_minor / 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) device->nt = register_tape_dev(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) &device->cdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) MKDEV(tapechar_major, device->first_minor),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) &tape_fops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) device_name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) "non-rewinding"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) );
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) device_name[0] = 'r';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) device->rt = register_tape_dev(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) &device->cdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) MKDEV(tapechar_major, device->first_minor + 1),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) &tape_fops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) device_name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) "rewinding"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) );
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) tapechar_cleanup_device(struct tape_device *device)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) unregister_tape_dev(&device->cdev->dev, device->rt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) device->rt = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) unregister_tape_dev(&device->cdev->dev, device->nt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) device->nt = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) tapechar_check_idalbuffer(struct tape_device *device, size_t block_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) struct idal_buffer *new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) if (device->char_data.idal_buf != NULL &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) device->char_data.idal_buf->size == block_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) if (block_size > MAX_BLOCKSIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) DBF_EVENT(3, "Invalid blocksize (%zd > %d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) block_size, MAX_BLOCKSIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) /* The current idal buffer is not correct. Allocate a new one. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) new = idal_buffer_alloc(block_size, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) if (IS_ERR(new))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) if (device->char_data.idal_buf != NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) idal_buffer_free(device->char_data.idal_buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) device->char_data.idal_buf = new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) * Tape device read function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) static ssize_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) tapechar_read(struct file *filp, char __user *data, size_t count, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) struct tape_device *device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) struct tape_request *request;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) size_t block_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) DBF_EVENT(6, "TCHAR:read\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) device = (struct tape_device *) filp->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) * If the tape isn't terminated yet, do it now. And since we then
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) * are at the end of the tape there wouldn't be anything to read
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) * anyways. So we return immediately.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) if(device->required_tapemarks) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) return tape_std_terminate_write(device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) /* Find out block size to use */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) if (device->char_data.block_size != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) if (count < device->char_data.block_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) DBF_EVENT(3, "TCHAR:read smaller than block "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) "size was requested\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) block_size = device->char_data.block_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) block_size = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) rc = tapechar_check_idalbuffer(device, block_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) DBF_EVENT(6, "TCHAR:nbytes: %lx\n", block_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) /* Let the discipline build the ccw chain. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) request = device->discipline->read_block(device, block_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) if (IS_ERR(request))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) return PTR_ERR(request);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) /* Execute it. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) rc = tape_do_io(device, request);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) if (rc == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) rc = block_size - request->rescnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) DBF_EVENT(6, "TCHAR:rbytes: %x\n", rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) /* Copy data from idal buffer to user space. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) if (idal_buffer_to_user(device->char_data.idal_buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) data, rc) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) rc = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) tape_free_request(request);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) * Tape device write function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) static ssize_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) tapechar_write(struct file *filp, const char __user *data, size_t count, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) struct tape_device *device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) struct tape_request *request;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) size_t block_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) size_t written;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) int nblocks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) int i, rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) DBF_EVENT(6, "TCHAR:write\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) device = (struct tape_device *) filp->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) /* Find out block size and number of blocks */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) if (device->char_data.block_size != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) if (count < device->char_data.block_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) DBF_EVENT(3, "TCHAR:write smaller than block "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) "size was requested\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) block_size = device->char_data.block_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) nblocks = count / block_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) block_size = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) nblocks = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) rc = tapechar_check_idalbuffer(device, block_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) DBF_EVENT(6,"TCHAR:nbytes: %lx\n", block_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) DBF_EVENT(6, "TCHAR:nblocks: %x\n", nblocks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) /* Let the discipline build the ccw chain. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) request = device->discipline->write_block(device, block_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) if (IS_ERR(request))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) return PTR_ERR(request);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) written = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) for (i = 0; i < nblocks; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) /* Copy data from user space to idal buffer. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) if (idal_buffer_from_user(device->char_data.idal_buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) data, block_size)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) rc = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) rc = tape_do_io(device, request);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) DBF_EVENT(6, "TCHAR:wbytes: %lx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) block_size - request->rescnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) written += block_size - request->rescnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) if (request->rescnt != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) data += block_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) tape_free_request(request);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) if (rc == -ENOSPC) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) * Ok, the device has no more space. It has NOT written
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) * the block.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) if (device->discipline->process_eov)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) device->discipline->process_eov(device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) if (written > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) * After doing a write we always need two tapemarks to correctly
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) * terminate the tape (one to terminate the file, the second to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) * flag the end of recorded data.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) * Since process_eov positions the tape in front of the written
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) * tapemark it doesn't hurt to write two marks again.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) if (!rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) device->required_tapemarks = 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) return rc ? rc : written;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) * Character frontend tape device open function.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) tapechar_open (struct inode *inode, struct file *filp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) struct tape_device *device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) int minor, rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) DBF_EVENT(6, "TCHAR:open: %i:%i\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) imajor(file_inode(filp)),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) iminor(file_inode(filp)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) if (imajor(file_inode(filp)) != tapechar_major)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) minor = iminor(file_inode(filp));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) device = tape_find_device(minor / TAPE_MINORS_PER_DEV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) if (IS_ERR(device)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) DBF_EVENT(3, "TCHAR:open: tape_find_device() failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) return PTR_ERR(device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) rc = tape_open(device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) if (rc == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) filp->private_data = device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) stream_open(inode, filp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) tape_put_device(device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) * Character frontend tape device release function.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) tapechar_release(struct inode *inode, struct file *filp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) struct tape_device *device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) DBF_EVENT(6, "TCHAR:release: %x\n", iminor(inode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) device = (struct tape_device *) filp->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) * If this is the rewinding tape minor then rewind. In that case we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) * write all required tapemarks. Otherwise only one to terminate the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) * file.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) if ((iminor(inode) & 1) != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) if (device->required_tapemarks)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) tape_std_terminate_write(device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) tape_mtop(device, MTREW, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) if (device->required_tapemarks > 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) if (tape_mtop(device, MTWEOF, 1) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) device->required_tapemarks--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) if (device->char_data.idal_buf != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) idal_buffer_free(device->char_data.idal_buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) device->char_data.idal_buf = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) tape_release(device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) filp->private_data = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) tape_put_device(device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) * Tape device io controls.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) __tapechar_ioctl(struct tape_device *device,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) unsigned int no, void __user *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) if (no == MTIOCTOP) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) struct mtop op;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) if (copy_from_user(&op, data, sizeof(op)) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) if (op.mt_count < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) * Operations that change tape position should write final
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) * tapemarks.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) switch (op.mt_op) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) case MTFSF:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) case MTBSF:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) case MTFSR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) case MTBSR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) case MTREW:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) case MTOFFL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) case MTEOM:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) case MTRETEN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) case MTBSFM:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) case MTFSFM:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) case MTSEEK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) if (device->required_tapemarks)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) tape_std_terminate_write(device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) rc = tape_mtop(device, op.mt_op, op.mt_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) if (op.mt_op == MTWEOF && rc == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) if (op.mt_count > device->required_tapemarks)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) device->required_tapemarks = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) device->required_tapemarks -= op.mt_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) if (no == MTIOCPOS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) /* MTIOCPOS: query the tape position. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) struct mtpos pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) rc = tape_mtop(device, MTTELL, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) if (rc < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) pos.mt_blkno = rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) return put_user_mtpos(data, &pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) if (no == MTIOCGET) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) /* MTIOCGET: query the tape drive status. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) struct mtget get;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) memset(&get, 0, sizeof(get));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) get.mt_type = MT_ISUNKNOWN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) get.mt_resid = 0 /* device->devstat.rescnt */;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) get.mt_dsreg =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) ((device->char_data.block_size << MT_ST_BLKSIZE_SHIFT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) & MT_ST_BLKSIZE_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) /* FIXME: mt_gstat, mt_erreg, mt_fileno */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) get.mt_gstat = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) get.mt_erreg = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) get.mt_fileno = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) get.mt_gstat = device->tape_generic_status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) if (device->medium_state == MS_LOADED) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) rc = tape_mtop(device, MTTELL, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) if (rc < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) if (rc == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) get.mt_gstat |= GMT_BOT(~0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) get.mt_blkno = rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) return put_user_mtget(data, &get);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) /* Try the discipline ioctl function. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) if (device->discipline->ioctl_fn == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) return device->discipline->ioctl_fn(device, no, (unsigned long)data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) static long
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) tapechar_ioctl(struct file *filp, unsigned int no, unsigned long data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) struct tape_device *device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) long rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) DBF_EVENT(6, "TCHAR:ioct\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) device = (struct tape_device *) filp->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) mutex_lock(&device->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) rc = __tapechar_ioctl(device, no, (void __user *)data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) mutex_unlock(&device->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) #ifdef CONFIG_COMPAT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) static long
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) tapechar_compat_ioctl(struct file *filp, unsigned int no, unsigned long data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) struct tape_device *device = filp->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) long rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) if (no == MTIOCPOS32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) no = MTIOCPOS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) else if (no == MTIOCGET32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) no = MTIOCGET;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) mutex_lock(&device->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) rc = __tapechar_ioctl(device, no, compat_ptr(data));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) mutex_unlock(&device->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) #endif /* CONFIG_COMPAT */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) * Initialize character device frontend.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) tapechar_init (void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) dev_t dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) if (alloc_chrdev_region(&dev, 0, 256, "tape") != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) tapechar_major = MAJOR(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) * cleanup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) tapechar_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) unregister_chrdev_region(MKDEV(tapechar_major, 0), 256);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
3 Commits
0 Branches
0 Tags