patch-2.1.101 linux/fs/nametrans.c

• Lines: 311
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.1.100/linux/fs/nametrans.c
• Orig date: Mon Dec 1 10:34:11 1997

diff -u --recursive --new-file v2.1.100/linux/fs/nametrans.c linux/fs/nametrans.c
@@ -1,310 +0,0 @@
-/*
- * $Id: nametrans.c,v 1.2 1997/06/04 23:45:44 davem Exp $
- *
- * linux/fs/nametrans.c - context-dependend filename suffixes.
- * Copyright (C) 1997, Thomas Schoebel-Theuer,
- * <schoebel@informatik.uni-stuttgart.de>.
- *
- * translates names of the form "filename#host=myhost#" to "filename"
- * as if both names were hardlinked to the same file.
- * benefit: diskless clients can mount the / filesystem of the
- * server if /etc/fstab (and other config files) are organized using
- * context suffixes.
- */
-
-#include <linux/config.h>
-#include <linux/errno.h>
-#include <linux/kernel.h>
-#include <linux/utsname.h>
-#include <linux/sched.h>
-#include <linux/mm.h>
-#include <asm/uaccess.h>
-#include <linux/nametrans.h>
-
-char  nametrans_txt[MAX_DEFAULT_TRANSLEN] = "";
-static struct translations * global_trans = NULL;
-static int default_trans = 1;
-static const char version[] = "revision: 2.3 <schoebel@informatik.uni-stuttgart.de>";
-int translations_dirty = 1;
-static char * transl_names[] = {
-#ifdef CONFIG_TR_NODENAME
-  "host=",        system_utsname.nodename,
-#endif
-#ifdef CONFIG_TR_KERNNAME
-  "kname=",  CONFIG_KERNNAME,
-#endif
-#ifdef CONFIG_TR_KERNTYPE
-  "ktype=",  CONFIG_KERNTYPE,
-#endif
-#ifdef CONFIG_TR_MACHINE
-  "machine=",     system_utsname.machine,
-#endif
-#ifdef CONFIG_TR_SYSNAME
-  "system=",      system_utsname.sysname,
-#endif
-  0, 0
-};
-
-/* Convert and do syntax checking. */
-static void convert(char * txt, struct translations * res)
-{
-	char * tmp = txt;
-	char * space = (char*)res + sizeof(struct translations);
-
-	res->count = 0;
-	while(*tmp) {
-		struct qstr * name = &res->name[res->count];
-		struct qstr * c_name = &res->c_name[res->count];
-		int len;
-		char * p = tmp;
-
-		if(*p++ != '#')
-			goto next;
-		while(*p && *p != '=' && *p != ':')
-			p++;
-		if(*p != '=')
-			goto next;
-		p++;
-		len = (unsigned long)p - (unsigned long)tmp;
-		c_name->name = space;
-		memcpy(space, tmp, len);
-		memcpy(space + len, "CREATE#", 8);
-		c_name->len = len + 7;
-		if(c_name->len >= MAX_TRANS_SUFFIX)
-			goto next;
-		while(*p && *p != '#' && *p != ':')
-			p++;
-		if(*p != '#')
-			goto next;
-		p++;
-		if(*p != ':' && *p)
-			goto next;
-		space += len + 8;
-		name->len = len = (unsigned long)p - (unsigned long)tmp;
-		if(len >= MAX_TRANS_SUFFIX)
-			goto next;
-		name->name = space;
-		memcpy(space, tmp, len);
-		space[len] = '\0';
-		space += len + 1;
-		res->count++;
-		if(res->count >= MAX_TRANSLATIONS ||
-		   (unsigned long)space - (unsigned long)res >= PAGE_SIZE-2*MAX_TRANS_SUFFIX)
-			return;
-	next:
-		while(*p && *p++ != ':') ;
-		tmp = p;
-	}
-}
-
-static inline void trans_to_string(struct translations * trans, char * buf, int maxlen)
-{
-	int i;
-
-	for(i = 0; i < trans->count; i++) {
-		int len = trans->name[i].len;
-		if(len < maxlen) {
-			memcpy(buf, trans->name[i].name, len);
-			buf += len;
-			maxlen -= len;
-			*buf++ = ':';
-			maxlen--;
-		}
-	}
-	buf--;
-	*buf = '\0';
-}
-
-static inline void default_nametrans(char * buf)
-{
-	char * res = buf;
-	char ** entry;
-	char * ptr;
-
-	for (entry = transl_names; *entry; entry++) {
-		*res++ = '#';
-		for(ptr = *entry; *ptr; ptr++)
-			*res++ = *ptr;
-		entry++;
-		for(ptr = *entry; *ptr; ptr++)
-			*res++ = *ptr;
-		*res++ = '#';
-		*res++ = ':';
-	}
-	res--;
-	*res = '\0';
-}
-
-void nametrans_setup(char * line)
-{
-	if(line) {
-		default_trans = (!line[0]);
-		if(!global_trans) {
-			/* This can happen at boot time, and there is no chance
-			 * to allocate memory at this early stage.
-			 */
-			strncpy(nametrans_txt, line, MAX_DEFAULT_TRANSLEN);
-		} else {
-			if(default_trans) {
-				default_nametrans(nametrans_txt);
-				line = nametrans_txt;
-			}
-			convert(line, global_trans);
-
-			/* Show what really was recognized after parsing... */
-			trans_to_string(global_trans, nametrans_txt, MAX_DEFAULT_TRANSLEN);
-		}
-	}
-}
-
-/* If the _first_ environment variable is "NAMETRANS", return
- * a pointer to the list of appendices.
- * You can set the first environment variable using
- * 'env - NAMETRANS=... "`env`" command ...'
- */
-char* env_transl(void)
-{
-	char* env;
-	int i;
-
-	if(current && current->mm && (env = (char*)current->mm->env_start)
-	   && !segment_eq(get_ds(), get_fs())
-	   && current->mm->env_end>=current->mm->env_start+10
-	   && !verify_area(VERIFY_READ,env,10)) {
-		for(i=0; i<10; i++) {
-			char c;
-
-			get_user(c, env++);
-			if(c != "NAMETRANS="[i])
-				return 0;
-		}
-		return env;
-	}
-	return 0;
-}
-
-/* If name has the correct suffix "#keyword=correct_context#",
- * return position of the suffix, else 0.
- */
-char *testname(int restricted, char* name)
-{
-	char * ptr = name;
-	char * cut;
-	char * env;
-	struct translations * trans;
-	int i, len;
-	char c, tmp;
-	
-	env = env_transl();
-#ifdef CONFIG_TRANS_RESTRICT
-	if(!env && restricted)
-		goto done;
-#else
-	(void)restricted; /* inhibit parameter usage warning */
-#endif
-	if(get_user(c, ptr))
-		goto done;
-	while(c && c != '#') {
-		ptr++;
-		__get_user(c, ptr);
-	}
-	if(!c)
-		goto done;
-	cut = ptr++;
-	if(get_user(c, ptr))
-		goto done;
-	while (c && c != '#') {
-		ptr++;
-		get_user(c, ptr);
-	}
-	if(!c)
-		goto done;
-	get_user(tmp, ptr);
-	if(tmp)
-		goto done;
-	trans = get_translations(env);
-	len = (unsigned long)ptr - (unsigned long)cut;
-	for(i = 0; i < trans->count; i++)
-		if(trans->name[i].len == len) {
-			const char * p1 = cut;
-			const char * p2 = trans->name[i].name;
-			get_user(c, p1);
-			while(c && c == *p2++) {
-				p1++;
-				get_user(c, p1);
-			}
-			if(!c)
-				return cut;
-		}
-done:
-	return NULL;
-}
-
-static inline void check_dirty(void)
-{
-	if(translations_dirty && default_trans) {
-		nametrans_setup("");
-		translations_dirty = 0;
-	}
-}
-
-struct translations * get_translations(char * env)
-{
-	struct translations * res;
-
-	if(env) {
-		char * env_txt = (char*)__get_free_page(GFP_KERNEL);
-
-		strncpy_from_user(env_txt, env, PAGE_SIZE);
-		res = (struct translations *)__get_free_page(GFP_KERNEL);
-		convert(env_txt, res);
-		free_page((unsigned long)env_txt);
-	} else {
-		check_dirty();
-		res = global_trans;
-	}
-	return res;
-}
-
-int nametrans_dostring(ctl_table * table, int write, struct file * filp,
-		       void * buffer, size_t * lenp)
-{
-	int res;
-	check_dirty();
-	res = proc_dostring(table, write, filp, buffer, lenp);
-	if(!res && write)
-		nametrans_setup(nametrans_txt);
-
-	return res;
-}
-
-int nametrans_string(ctl_table * table, int * name, int nlen,
-		     void * oldval, size_t * oldlenp,
-		     void * newval, size_t newlen, void ** context)
-{
-	int res;
-	check_dirty();
-	res = sysctl_string(table, name, nlen, oldval, oldlenp, newval, newlen, context);
-	if(!res && newval && newlen)
-		nametrans_setup(nametrans_txt);
-
-	return res;
-}
-
-void init_nametrans(void)
-{
-	if(!global_trans)
-		global_trans = (struct translations*)__get_free_page(GFP_KERNEL);
-	if(!global_trans) {
-		printk("NAMETRANS: No free memory\n");
-		return;
-	}
-	nametrans_setup(nametrans_txt);
-
-	/* Notify user for the default/supplied translations.
-	 * Extremely useful for finding translation problems.
-	 */
-	printk("Nametrans %s\nNametrans %s: %s\n", version,
-	       default_trans ? "default translations" : "external parameter",
-	       nametrans_txt);
-}