diff options
Diffstat (limited to 'drivers/char/ftape/zftape/zftape-init.c')
| -rw-r--r-- | drivers/char/ftape/zftape/zftape-init.c | 403 |
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 0000000..dbac7e5 --- /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(¤t->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 (¤t->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(¤t->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(¤t->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(¤t->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(¤t->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(¤t->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); |
