604 lines
13 KiB
C
604 lines
13 KiB
C
/*
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* $Id$
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*
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* (c) Copyright 2000 by Carsten Paeth (calle@calle.de)
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*
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* Heavily based on devpts filesystem from H. Peter Anvin
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*
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* $Log$
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* Revision 1.4 2000/03/08 17:06:33 calle
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* - changes for devfs and 2.3.49
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* - capifs now configurable (no need with devfs)
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* - New Middleware ioctl CAPI_NCCI_GETUNIT
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* - Middleware again tested with 2.2.14 and 2.3.49 (with and without devfs)
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*
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* Revision 1.3 2000/03/06 18:00:23 calle
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* - Middleware extention now working with 2.3.49 (capifs).
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* - Fixed typos in debug section of capi.c
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* - Bugfix: Makefile corrected for b1pcmcia.c
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*
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* Revision 1.2 2000/03/06 09:17:07 calle
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* - capifs: fileoperations now in inode (change for 2.3.49)
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* - Config.in: Middleware extention not a tristate, uups.
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*
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* Revision 1.1 2000/03/03 16:48:38 calle
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* - Added CAPI2.0 Middleware support (CONFIG_ISDN_CAPI)
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* It is now possible to create a connection with a CAPI2.0 applikation
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* and than to handle the data connection from /dev/capi/ (capifs) and also
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* using async or sync PPP on this connection.
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* The two major device number 190 and 191 are not confirmed yet,
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* but I want to save the code in cvs, before I go on.
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*
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*
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*/
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#include <linux/fs.h>
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#include <linux/tty.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/stat.h>
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#include <linux/param.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/fs.h>
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#include <linux/init.h>
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#include <linux/kdev_t.h>
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#include <linux/kernel.h>
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#include <linux/locks.h>
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#include <linux/major.h>
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#include <linux/malloc.h>
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#include <linux/stat.h>
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#include <linux/tty.h>
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#include <linux/ctype.h>
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#include <asm/bitops.h>
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#include <asm/uaccess.h>
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MODULE_AUTHOR("Carsten Paeth <calle@calle.de>");
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static char *revision = "$Revision$";
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struct capifs_ncci {
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struct inode *inode;
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char used;
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char type;
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unsigned int num;
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kdev_t kdev;
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};
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struct capifs_sb_info {
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u32 magic;
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struct super_block *next;
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struct super_block **back;
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int setuid;
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int setgid;
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uid_t uid;
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gid_t gid;
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umode_t mode;
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unsigned int max_ncci;
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struct capifs_ncci *nccis;
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};
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#define CAPIFS_SUPER_MAGIC (('C'<<8)|'N')
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#define CAPIFS_SBI_MAGIC (('C'<<24)|('A'<<16)|('P'<<8)|'I')
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static inline struct capifs_sb_info *SBI(struct super_block *sb)
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{
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return (struct capifs_sb_info *)(sb->u.generic_sbp);
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}
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/* ------------------------------------------------------------------ */
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static int capifs_root_readdir(struct file *,void *,filldir_t);
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static struct dentry *capifs_root_lookup(struct inode *,struct dentry *);
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static int capifs_revalidate(struct dentry *, int);
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static struct file_operations capifs_root_operations = {
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#ifdef COMPAT_has_generic_read_dir
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read: generic_read_dir,
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#endif
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readdir: capifs_root_readdir,
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};
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struct inode_operations capifs_root_inode_operations = {
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#ifndef COMPAT_has_fileops_in_inode
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&capifs_root_operations, /* file operations */
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#endif
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lookup: capifs_root_lookup,
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};
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struct inode_operations capifs_inode_operations;
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static struct dentry_operations capifs_dentry_operations = {
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capifs_revalidate, /* d_revalidate */
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NULL, /* d_hash */
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NULL, /* d_compare */
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};
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/*
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* /dev/capi/%d
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* /dev/capi/r%d
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*/
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static int capifs_root_readdir(struct file *filp, void *dirent, filldir_t filldir)
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{
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struct inode * inode = filp->f_dentry->d_inode;
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struct capifs_sb_info * sbi = SBI(filp->f_dentry->d_inode->i_sb);
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off_t nr;
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char numbuf[32];
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nr = filp->f_pos;
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switch(nr)
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{
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case 0:
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if (filldir(dirent, ".", 1, nr, inode->i_ino) < 0)
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return 0;
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filp->f_pos = ++nr;
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/* fall through */
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case 1:
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if (filldir(dirent, "..", 2, nr, inode->i_ino) < 0)
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return 0;
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filp->f_pos = ++nr;
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/* fall through */
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default:
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while (nr < sbi->max_ncci) {
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int n = nr - 2;
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struct capifs_ncci *np = &sbi->nccis[n];
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if (np->inode && np->used) {
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char *p = numbuf;
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if (np->type) *p++ = np->type;
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sprintf(p, "%u", np->num);
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if ( filldir(dirent, numbuf, strlen(numbuf), nr, nr) < 0 )
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return 0;
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}
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filp->f_pos = ++nr;
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}
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break;
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}
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return 0;
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}
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/*
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* Revalidate is called on every cache lookup. We use it to check that
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* the ncci really does still exist. Never revalidate negative dentries;
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* for simplicity (fix later?)
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*/
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static int capifs_revalidate(struct dentry * dentry, int flags)
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{
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struct capifs_sb_info *sbi;
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if ( !dentry->d_inode )
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return 0;
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sbi = SBI(dentry->d_inode->i_sb);
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return ( sbi->nccis[dentry->d_inode->i_ino - 2].inode == dentry->d_inode );
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}
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static struct dentry *capifs_root_lookup(struct inode * dir, struct dentry * dentry)
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{
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struct capifs_sb_info *sbi = SBI(dir->i_sb);
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struct capifs_ncci *np;
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unsigned int i;
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char numbuf[32];
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char *p, *tmp;
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unsigned int num;
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char type = 0;
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dentry->d_inode = NULL; /* Assume failure */
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dentry->d_op = &capifs_dentry_operations;
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if (dentry->d_name.len >= sizeof(numbuf) )
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return NULL;
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strncpy(numbuf, dentry->d_name.name, dentry->d_name.len);
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numbuf[dentry->d_name.len] = 0;
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p = numbuf;
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if (!isdigit(*p)) type = *p++;
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tmp = p;
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num = (unsigned int)simple_strtoul(p, &tmp, 10);
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if (tmp == p || *tmp)
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return NULL;
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for (i = 0, np = sbi->nccis ; i < sbi->max_ncci; i++, np++) {
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if (np->used && np->num == num && np->type == type)
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break;
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}
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if ( i >= sbi->max_ncci )
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return NULL;
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dentry->d_inode = np->inode;
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if ( dentry->d_inode )
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dentry->d_inode->i_count++;
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d_add(dentry, dentry->d_inode);
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return NULL;
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}
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/* ------------------------------------------------------------------ */
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static struct super_block *mounts = NULL;
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static void capifs_put_super(struct super_block *sb)
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{
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struct capifs_sb_info *sbi = SBI(sb);
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struct inode *inode;
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int i;
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for ( i = 0 ; i < sbi->max_ncci ; i++ ) {
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if ( (inode = sbi->nccis[i].inode) ) {
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if ( inode->i_count != 1 )
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printk("capifs_put_super: badness: entry %d count %d\n",
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i, inode->i_count);
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inode->i_nlink--;
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iput(inode);
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}
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}
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*sbi->back = sbi->next;
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if ( sbi->next )
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SBI(sbi->next)->back = sbi->back;
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kfree(sbi->nccis);
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kfree(sbi);
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MOD_DEC_USE_COUNT;
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}
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static int capifs_statfs(struct super_block *sb, struct statfs *buf, int bufsiz);
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static void capifs_read_inode(struct inode *inode);
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static void capifs_write_inode(struct inode *inode);
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static struct super_operations capifs_sops = {
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read_inode: capifs_read_inode,
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write_inode: capifs_write_inode,
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put_super: capifs_put_super,
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statfs: capifs_statfs,
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};
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static int capifs_parse_options(char *options, struct capifs_sb_info *sbi)
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{
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int setuid = 0;
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int setgid = 0;
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uid_t uid = 0;
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gid_t gid = 0;
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umode_t mode = 0600;
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unsigned int maxncci = 512;
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char *this_char, *value;
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this_char = NULL;
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if ( options )
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this_char = strtok(options,",");
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for ( ; this_char; this_char = strtok(NULL,",")) {
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if ((value = strchr(this_char,'=')) != NULL)
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*value++ = 0;
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if (!strcmp(this_char,"uid")) {
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if (!value || !*value)
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return 1;
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uid = simple_strtoul(value,&value,0);
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if (*value)
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return 1;
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setuid = 1;
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}
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else if (!strcmp(this_char,"gid")) {
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if (!value || !*value)
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return 1;
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gid = simple_strtoul(value,&value,0);
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if (*value)
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return 1;
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setgid = 1;
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}
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else if (!strcmp(this_char,"mode")) {
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if (!value || !*value)
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return 1;
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mode = simple_strtoul(value,&value,8);
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if (*value)
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return 1;
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}
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else if (!strcmp(this_char,"maxncci")) {
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if (!value || !*value)
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return 1;
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maxncci = simple_strtoul(value,&value,8);
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if (*value)
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return 1;
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}
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else
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return 1;
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}
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sbi->setuid = setuid;
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sbi->setgid = setgid;
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sbi->uid = uid;
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sbi->gid = gid;
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sbi->mode = mode & ~S_IFMT;
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sbi->max_ncci = maxncci;
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return 0;
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}
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struct super_block *capifs_read_super(struct super_block *s, void *data,
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int silent)
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{
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struct inode * root_inode;
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struct dentry * root;
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struct capifs_sb_info *sbi;
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MOD_INC_USE_COUNT;
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lock_super(s);
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/* Super block already completed? */
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if (s->s_root) {
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unlock_super(s);
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goto out;
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}
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sbi = (struct capifs_sb_info *) kmalloc(sizeof(struct capifs_sb_info), GFP_KERNEL);
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if ( !sbi ) {
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unlock_super(s);
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goto fail;
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}
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memset(sbi, 0, sizeof(struct capifs_sb_info));
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sbi->magic = CAPIFS_SBI_MAGIC;
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/* Can this call block? (It shouldn't) */
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if ( capifs_parse_options(data,sbi) ) {
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kfree(sbi);
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unlock_super(s);
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printk("capifs: called with bogus options\n");
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goto fail;
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}
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sbi->nccis = kmalloc(sizeof(struct capifs_ncci) * sbi->max_ncci, GFP_KERNEL);
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if ( !sbi->nccis ) {
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kfree(sbi);
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unlock_super(s);
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goto fail;
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}
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memset(sbi->nccis, 0, sizeof(struct capifs_ncci) * sbi->max_ncci);
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s->u.generic_sbp = (void *) sbi;
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s->s_blocksize = 1024;
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s->s_blocksize_bits = 10;
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s->s_magic = CAPIFS_SUPER_MAGIC;
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s->s_op = &capifs_sops;
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s->s_root = NULL;
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unlock_super(s); /* shouldn't we keep it locked a while longer? */
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/*
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* Get the root inode and dentry, but defer checking for errors.
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*/
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root_inode = iget(s, 1); /* inode 1 == root directory */
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#ifdef COMPAT_d_alloc_root_one_parameter
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root = d_alloc_root(root_inode);
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#else
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root = d_alloc_root(root_inode, NULL);
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#endif
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/*
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* Check whether somebody else completed the super block.
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*/
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if (s->s_root) {
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if (root) dput(root);
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else iput(root_inode);
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goto out;
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}
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if (!root) {
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printk("capifs: get root dentry failed\n");
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/*
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* iput() can block, so we clear the super block first.
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*/
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s->s_dev = 0;
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iput(root_inode);
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kfree(sbi->nccis);
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kfree(sbi);
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goto fail;
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}
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/*
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* Check whether somebody else completed the super block.
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*/
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if (s->s_root)
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goto out;
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/*
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* Success! Install the root dentry now to indicate completion.
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*/
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lock_super(s);
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s->s_root = root;
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sbi->next = mounts;
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if ( sbi->next )
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SBI(sbi->next)->back = &(sbi->next);
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sbi->back = &mounts;
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mounts = s;
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unlock_super(s);
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return s;
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/*
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* Success ... somebody else completed the super block for us.
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*/
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out:
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MOD_DEC_USE_COUNT;
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return s;
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fail:
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s->s_dev = 0;
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MOD_DEC_USE_COUNT;
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return NULL;
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}
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static int capifs_statfs(struct super_block *sb, struct statfs *buf, int bufsiz)
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{
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struct statfs tmp;
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tmp.f_type = CAPIFS_SUPER_MAGIC;
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tmp.f_bsize = 1024;
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tmp.f_blocks = 0;
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tmp.f_bfree = 0;
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tmp.f_bavail = 0;
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tmp.f_files = 0;
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tmp.f_ffree = 0;
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tmp.f_namelen = NAME_MAX;
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return copy_to_user(buf, &tmp, bufsiz) ? -EFAULT : 0;
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}
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static void capifs_read_inode(struct inode *inode)
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{
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ino_t ino = inode->i_ino;
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struct capifs_sb_info *sbi = SBI(inode->i_sb);
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inode->i_op = NULL;
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inode->i_mode = 0;
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inode->i_nlink = 0;
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inode->i_size = 0;
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inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
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inode->i_blocks = 0;
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inode->i_blksize = 1024;
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inode->i_uid = inode->i_gid = 0;
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if ( ino == 1 ) {
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inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO | S_IWUSR;
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inode->i_op = &capifs_root_inode_operations;
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#ifdef COMPAT_has_fileops_in_inode
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inode->i_fop = &capifs_root_operations;
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#endif
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inode->i_nlink = 2;
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return;
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}
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#ifdef COMPAT_has_fileops_in_inode
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/* need dummy inode operations .... */
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inode->i_op = &capifs_inode_operations;
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#endif
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ino -= 2;
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if ( ino >= sbi->max_ncci )
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return; /* Bogus */
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#ifdef COMPAT_HAS_init_special_inode
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init_special_inode(inode, S_IFCHR, 0);
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#else
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inode->i_mode = S_IFCHR;
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inode->i_op = &chrdev_inode_operations;
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#endif
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return;
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}
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static void capifs_write_inode(struct inode *inode)
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{
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}
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static struct file_system_type capifs_fs_type = {
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"capifs",
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0,
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capifs_read_super,
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NULL
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};
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void capifs_new_ncci(char type, unsigned int num, kdev_t device)
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{
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struct super_block *sb;
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struct capifs_sb_info *sbi;
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struct capifs_ncci *np;
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ino_t ino;
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for ( sb = mounts ; sb ; sb = sbi->next ) {
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sbi = SBI(sb);
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for (ino = 0, np = sbi->nccis ; ino < sbi->max_ncci; ino++, np++) {
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if (np->used == 0) {
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np->used = 1;
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np->type = type;
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np->num = num;
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np->kdev = device;
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break;
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}
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}
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if ((np->inode = iget(sb, ino+2)) != 0) {
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struct inode *inode = np->inode;
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inode->i_uid = sbi->setuid ? sbi->uid : current->fsuid;
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inode->i_gid = sbi->setgid ? sbi->gid : current->fsgid;
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inode->i_mode = sbi->mode | S_IFCHR;
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inode->i_rdev = np->kdev;
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inode->i_nlink++;
|
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}
|
|
}
|
|
}
|
|
|
|
void capifs_free_ncci(char type, unsigned int num)
|
|
{
|
|
struct super_block *sb;
|
|
struct capifs_sb_info *sbi;
|
|
struct inode *inode;
|
|
struct capifs_ncci *np;
|
|
ino_t ino;
|
|
|
|
for ( sb = mounts ; sb ; sb = sbi->next ) {
|
|
sbi = SBI(sb);
|
|
|
|
for (ino = 0, np = sbi->nccis ; ino < sbi->max_ncci; ino++, np++) {
|
|
if (!np->used || np->type != type || np->num != num)
|
|
continue;
|
|
if (np->inode) {
|
|
inode = np->inode;
|
|
np->used = 0;
|
|
inode->i_nlink--;
|
|
iput(inode);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
int __init capifs_init(void)
|
|
{
|
|
char rev[10];
|
|
char *p;
|
|
int err;
|
|
|
|
if ((p = strchr(revision, ':'))) {
|
|
strcpy(rev, p + 1);
|
|
p = strchr(rev, '$');
|
|
*p = 0;
|
|
} else
|
|
strcpy(rev, "1.0");
|
|
|
|
err = register_filesystem(&capifs_fs_type);
|
|
if (err)
|
|
return err;
|
|
#ifdef MODULE
|
|
printk(KERN_NOTICE "capifs: Rev%s: loaded\n", rev);
|
|
#else
|
|
printk(KERN_NOTICE "capifs: Rev%s: started\n", rev);
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
void capifs_exit(void)
|
|
{
|
|
unregister_filesystem(&capifs_fs_type);
|
|
}
|
|
|
|
EXPORT_SYMBOL(capifs_new_ncci);
|
|
EXPORT_SYMBOL(capifs_free_ncci);
|
|
|
|
#ifdef MODULE
|
|
|
|
int init_module(void)
|
|
{
|
|
return capifs_init();
|
|
}
|
|
|
|
void cleanup_module(void)
|
|
{
|
|
capifs_exit();
|
|
}
|
|
|
|
#endif
|