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Diffstat (limited to 'drivers/char/ftape/zftape/zftape-init.c')
-rw-r--r--drivers/char/ftape/zftape/zftape-init.c403
1 files changed, 403 insertions, 0 deletions
diff --git a/drivers/char/ftape/zftape/zftape-init.c b/drivers/char/ftape/zftape/zftape-init.c
new file mode 100644
index 000000000000..dbac7e54e8e0
--- /dev/null
+++ b/drivers/char/ftape/zftape/zftape-init.c
@@ -0,0 +1,403 @@
+/*
+ * Copyright (C) 1996, 1997 Claus-Justus Heine.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; see the file COPYING. If not, write to
+ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+
+ *
+ * This file contains the code that registers the zftape frontend
+ * to the ftape floppy tape driver for Linux
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/kernel.h>
+#include <linux/signal.h>
+#include <linux/major.h>
+#include <linux/slab.h>
+#ifdef CONFIG_KMOD
+#include <linux/kmod.h>
+#endif
+#include <linux/fcntl.h>
+#include <linux/smp_lock.h>
+#include <linux/devfs_fs_kernel.h>
+
+#include <linux/zftape.h>
+#include <linux/init.h>
+#include <linux/device.h>
+
+#include "../zftape/zftape-init.h"
+#include "../zftape/zftape-read.h"
+#include "../zftape/zftape-write.h"
+#include "../zftape/zftape-ctl.h"
+#include "../zftape/zftape-buffers.h"
+
+MODULE_AUTHOR("(c) 1996, 1997 Claus-Justus Heine "
+ "(claus@momo.math.rwth-aachen.de)");
+MODULE_DESCRIPTION(ZFTAPE_VERSION " - "
+ "VFS interface for the Linux floppy tape driver. "
+ "Support for QIC-113 compatible volume table "
+ "and builtin compression (lzrw3 algorithm)");
+MODULE_SUPPORTED_DEVICE("char-major-27");
+MODULE_LICENSE("GPL");
+
+/* Global vars.
+ */
+struct zft_cmpr_ops *zft_cmpr_ops = NULL;
+const ftape_info *zft_status;
+
+/* Local vars.
+ */
+static unsigned long busy_flag;
+
+static sigset_t orig_sigmask;
+
+/* the interface to the kernel vfs layer
+ */
+
+/* Note about llseek():
+ *
+ * st.c and tpqic.c update fp->f_pos but don't implment llseek() and
+ * initialize the llseek component of the file_ops struct with NULL.
+ * This means that the user will get the default seek, but the tape
+ * device will not respect the new position, but happily read from the
+ * old position. Think a zftape specific llseek() function would be
+ * better, returning -ESPIPE. TODO.
+ */
+
+static int zft_open (struct inode *ino, struct file *filep);
+static int zft_close(struct inode *ino, struct file *filep);
+static int zft_ioctl(struct inode *ino, struct file *filep,
+ unsigned int command, unsigned long arg);
+static int zft_mmap(struct file *filep, struct vm_area_struct *vma);
+static ssize_t zft_read (struct file *fp, char __user *buff,
+ size_t req_len, loff_t *ppos);
+static ssize_t zft_write(struct file *fp, const char __user *buff,
+ size_t req_len, loff_t *ppos);
+
+static struct file_operations zft_cdev =
+{
+ .owner = THIS_MODULE,
+ .read = zft_read,
+ .write = zft_write,
+ .ioctl = zft_ioctl,
+ .mmap = zft_mmap,
+ .open = zft_open,
+ .release = zft_close,
+};
+
+static struct class_simple *zft_class;
+
+/* Open floppy tape device
+ */
+static int zft_open(struct inode *ino, struct file *filep)
+{
+ int result;
+ TRACE_FUN(ft_t_flow);
+
+ nonseekable_open(ino, filep);
+ TRACE(ft_t_flow, "called for minor %d", iminor(ino));
+ if ( test_and_set_bit(0,&busy_flag) ) {
+ TRACE_ABORT(-EBUSY, ft_t_warn, "failed: already busy");
+ }
+ if ((iminor(ino) & ~(ZFT_MINOR_OP_MASK | FTAPE_NO_REWIND))
+ >
+ FTAPE_SEL_D) {
+ clear_bit(0,&busy_flag);
+ TRACE_ABORT(-ENXIO, ft_t_err, "failed: invalid unit nr");
+ }
+ orig_sigmask = current->blocked;
+ sigfillset(&current->blocked);
+ result = _zft_open(iminor(ino), filep->f_flags & O_ACCMODE);
+ if (result < 0) {
+ current->blocked = orig_sigmask; /* restore mask */
+ clear_bit(0,&busy_flag);
+ TRACE_ABORT(result, ft_t_err, "_ftape_open failed");
+ } else {
+ /* Mask signals that will disturb proper operation of the
+ * program that is calling.
+ */
+ current->blocked = orig_sigmask;
+ sigaddsetmask (&current->blocked, _DO_BLOCK);
+ TRACE_EXIT 0;
+ }
+}
+
+/* Close floppy tape device
+ */
+static int zft_close(struct inode *ino, struct file *filep)
+{
+ int result;
+ TRACE_FUN(ft_t_flow);
+
+ if ( !test_bit(0,&busy_flag) || iminor(ino) != zft_unit) {
+ TRACE(ft_t_err, "failed: not busy or wrong unit");
+ TRACE_EXIT 0;
+ }
+ sigfillset(&current->blocked);
+ result = _zft_close();
+ if (result < 0) {
+ TRACE(ft_t_err, "_zft_close failed");
+ }
+ current->blocked = orig_sigmask; /* restore before open state */
+ clear_bit(0,&busy_flag);
+ TRACE_EXIT 0;
+}
+
+/* Ioctl for floppy tape device
+ */
+static int zft_ioctl(struct inode *ino, struct file *filep,
+ unsigned int command, unsigned long arg)
+{
+ int result = -EIO;
+ sigset_t old_sigmask;
+ TRACE_FUN(ft_t_flow);
+
+ if ( !test_bit(0,&busy_flag) || iminor(ino) != zft_unit || ft_failure) {
+ TRACE_ABORT(-EIO, ft_t_err,
+ "failed: not busy, failure or wrong unit");
+ }
+ old_sigmask = current->blocked; /* save mask */
+ sigfillset(&current->blocked);
+ /* This will work as long as sizeof(void *) == sizeof(long) */
+ result = _zft_ioctl(command, (void __user *) arg);
+ current->blocked = old_sigmask; /* restore mask */
+ TRACE_EXIT result;
+}
+
+/* Ioctl for floppy tape device
+ */
+static int zft_mmap(struct file *filep, struct vm_area_struct *vma)
+{
+ int result = -EIO;
+ sigset_t old_sigmask;
+ TRACE_FUN(ft_t_flow);
+
+ if ( !test_bit(0,&busy_flag) ||
+ iminor(filep->f_dentry->d_inode) != zft_unit ||
+ ft_failure)
+ {
+ TRACE_ABORT(-EIO, ft_t_err,
+ "failed: not busy, failure or wrong unit");
+ }
+ old_sigmask = current->blocked; /* save mask */
+ sigfillset(&current->blocked);
+ if ((result = ftape_mmap(vma)) >= 0) {
+#ifndef MSYNC_BUG_WAS_FIXED
+ static struct vm_operations_struct dummy = { NULL, };
+ vma->vm_ops = &dummy;
+#endif
+ }
+ current->blocked = old_sigmask; /* restore mask */
+ TRACE_EXIT result;
+}
+
+/* Read from floppy tape device
+ */
+static ssize_t zft_read(struct file *fp, char __user *buff,
+ size_t req_len, loff_t *ppos)
+{
+ int result = -EIO;
+ sigset_t old_sigmask;
+ struct inode *ino = fp->f_dentry->d_inode;
+ TRACE_FUN(ft_t_flow);
+
+ TRACE(ft_t_data_flow, "called with count: %ld", (unsigned long)req_len);
+ if (!test_bit(0,&busy_flag) || iminor(ino) != zft_unit || ft_failure) {
+ TRACE_ABORT(-EIO, ft_t_err,
+ "failed: not busy, failure or wrong unit");
+ }
+ old_sigmask = current->blocked; /* save mask */
+ sigfillset(&current->blocked);
+ result = _zft_read(buff, req_len);
+ current->blocked = old_sigmask; /* restore mask */
+ TRACE(ft_t_data_flow, "return with count: %d", result);
+ TRACE_EXIT result;
+}
+
+/* Write to tape device
+ */
+static ssize_t zft_write(struct file *fp, const char __user *buff,
+ size_t req_len, loff_t *ppos)
+{
+ int result = -EIO;
+ sigset_t old_sigmask;
+ struct inode *ino = fp->f_dentry->d_inode;
+ TRACE_FUN(ft_t_flow);
+
+ TRACE(ft_t_flow, "called with count: %ld", (unsigned long)req_len);
+ if (!test_bit(0,&busy_flag) || iminor(ino) != zft_unit || ft_failure) {
+ TRACE_ABORT(-EIO, ft_t_err,
+ "failed: not busy, failure or wrong unit");
+ }
+ old_sigmask = current->blocked; /* save mask */
+ sigfillset(&current->blocked);
+ result = _zft_write(buff, req_len);
+ current->blocked = old_sigmask; /* restore mask */
+ TRACE(ft_t_data_flow, "return with count: %d", result);
+ TRACE_EXIT result;
+}
+
+/* END OF VFS INTERFACE
+ *
+ *****************************************************************************/
+
+/* driver/module initialization
+ */
+
+/* the compression module has to call this function to hook into the zftape
+ * code
+ */
+int zft_cmpr_register(struct zft_cmpr_ops *new_ops)
+{
+ TRACE_FUN(ft_t_flow);
+
+ if (zft_cmpr_ops != NULL) {
+ TRACE_EXIT -EBUSY;
+ } else {
+ zft_cmpr_ops = new_ops;
+ TRACE_EXIT 0;
+ }
+}
+
+/* lock the zft-compressor() module.
+ */
+int zft_cmpr_lock(int try_to_load)
+{
+ if (zft_cmpr_ops == NULL) {
+#ifdef CONFIG_KMOD
+ if (try_to_load) {
+ request_module("zft-compressor");
+ if (zft_cmpr_ops == NULL) {
+ return -ENOSYS;
+ }
+ } else {
+ return -ENOSYS;
+ }
+#else
+ return -ENOSYS;
+#endif
+ }
+ (*zft_cmpr_ops->lock)();
+ return 0;
+}
+
+#ifdef CONFIG_ZFT_COMPRESSOR
+extern int zft_compressor_init(void);
+#endif
+
+/* Called by modules package when installing the driver or by kernel
+ * during the initialization phase
+ */
+int __init zft_init(void)
+{
+ int i;
+ TRACE_FUN(ft_t_flow);
+
+#ifdef MODULE
+ printk(KERN_INFO ZFTAPE_VERSION "\n");
+ if (TRACE_LEVEL >= ft_t_info) {
+ printk(
+KERN_INFO
+"(c) 1996, 1997 Claus-Justus Heine (claus@momo.math.rwth-aachen.de)\n"
+KERN_INFO
+"vfs interface for ftape floppy tape driver.\n"
+KERN_INFO
+"Support for QIC-113 compatible volume table, dynamic memory allocation\n"
+KERN_INFO
+"and builtin compression (lzrw3 algorithm).\n");
+ }
+#else /* !MODULE */
+ /* print a short no-nonsense boot message */
+ printk(KERN_INFO ZFTAPE_VERSION "\n");
+#endif /* MODULE */
+ TRACE(ft_t_info, "zft_init @ 0x%p", zft_init);
+ TRACE(ft_t_info,
+ "installing zftape VFS interface for ftape driver ...");
+ TRACE_CATCH(register_chrdev(QIC117_TAPE_MAJOR, "zft", &zft_cdev),);
+
+ zft_class = class_simple_create(THIS_MODULE, "zft");
+ for (i = 0; i < 4; i++) {
+ class_simple_device_add(zft_class, MKDEV(QIC117_TAPE_MAJOR, i), NULL, "qft%i", i);
+ devfs_mk_cdev(MKDEV(QIC117_TAPE_MAJOR, i),
+ S_IFCHR | S_IRUSR | S_IWUSR,
+ "qft%i", i);
+ class_simple_device_add(zft_class, MKDEV(QIC117_TAPE_MAJOR, i + 4), NULL, "nqft%i", i);
+ devfs_mk_cdev(MKDEV(QIC117_TAPE_MAJOR, i + 4),
+ S_IFCHR | S_IRUSR | S_IWUSR,
+ "nqft%i", i);
+ class_simple_device_add(zft_class, MKDEV(QIC117_TAPE_MAJOR, i + 16), NULL, "zqft%i", i);
+ devfs_mk_cdev(MKDEV(QIC117_TAPE_MAJOR, i + 16),
+ S_IFCHR | S_IRUSR | S_IWUSR,
+ "zqft%i", i);
+ class_simple_device_add(zft_class, MKDEV(QIC117_TAPE_MAJOR, i + 20), NULL, "nzqft%i", i);
+ devfs_mk_cdev(MKDEV(QIC117_TAPE_MAJOR, i + 20),
+ S_IFCHR | S_IRUSR | S_IWUSR,
+ "nzqft%i", i);
+ class_simple_device_add(zft_class, MKDEV(QIC117_TAPE_MAJOR, i + 32), NULL, "rawqft%i", i);
+ devfs_mk_cdev(MKDEV(QIC117_TAPE_MAJOR, i + 32),
+ S_IFCHR | S_IRUSR | S_IWUSR,
+ "rawqft%i", i);
+ class_simple_device_add(zft_class, MKDEV(QIC117_TAPE_MAJOR, i + 36), NULL, "nrawrawqft%i", i);
+ devfs_mk_cdev(MKDEV(QIC117_TAPE_MAJOR, i + 36),
+ S_IFCHR | S_IRUSR | S_IWUSR,
+ "nrawqft%i", i);
+ }
+
+#ifdef CONFIG_ZFT_COMPRESSOR
+ (void)zft_compressor_init();
+#endif
+ zft_status = ftape_get_status(); /* fetch global data of ftape
+ * hardware driver
+ */
+ TRACE_EXIT 0;
+}
+
+
+/* Called by modules package when removing the driver
+ */
+static void zft_exit(void)
+{
+ int i;
+ TRACE_FUN(ft_t_flow);
+
+ if (unregister_chrdev(QIC117_TAPE_MAJOR, "zft") != 0) {
+ TRACE(ft_t_warn, "failed");
+ } else {
+ TRACE(ft_t_info, "successful");
+ }
+ for (i = 0; i < 4; i++) {
+ devfs_remove("qft%i", i);
+ class_simple_device_remove(MKDEV(QIC117_TAPE_MAJOR, i));
+ devfs_remove("nqft%i", i);
+ class_simple_device_remove(MKDEV(QIC117_TAPE_MAJOR, i + 4));
+ devfs_remove("zqft%i", i);
+ class_simple_device_remove(MKDEV(QIC117_TAPE_MAJOR, i + 16));
+ devfs_remove("nzqft%i", i);
+ class_simple_device_remove(MKDEV(QIC117_TAPE_MAJOR, i + 20));
+ devfs_remove("rawqft%i", i);
+ class_simple_device_remove(MKDEV(QIC117_TAPE_MAJOR, i + 32));
+ devfs_remove("nrawqft%i", i);
+ class_simple_device_remove(MKDEV(QIC117_TAPE_MAJOR, i + 36));
+ }
+ class_simple_destroy(zft_class);
+ zft_uninit_mem(); /* release remaining memory, if any */
+ printk(KERN_INFO "zftape successfully unloaded.\n");
+ TRACE_EXIT;
+}
+
+module_init(zft_init);
+module_exit(zft_exit);
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-25 20:01:44 +0300