patch-2.3.43 linux/fs/proc/omirr.c

• Lines: 280
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.3.42/linux/fs/proc/omirr.c
• Orig date: Fri Jan 7 19:13:22 2000

diff -u --recursive --new-file v2.3.42/linux/fs/proc/omirr.c linux/fs/proc/omirr.c
@@ -1,279 +0,0 @@
-/*
- * fs/proc/omirr.c  -  online mirror support
- *
- * (C) 1997 Thomas Schoebel-Theuer
- */
-
-#include <linux/string.h>
-#include <linux/mm.h>
-#include <linux/fs.h>
-#include <linux/omirr.h>
-#include <asm/uaccess.h>
-
-static int nr_omirr_open = 0;
-static int cleared_flag = 0;
-
-static char * buffer = NULL;
-static int read_pos, write_pos;
-static int clip_pos, max_pos;
-static DECLARE_WAIT_QUEUE_HEAD(read_wait);
-static DECLARE_WAIT_QUEUE_HEAD(write_wait);
-
-static /*inline*/ int reserve_write_space(int len)
-{
-	int rest = max_pos - write_pos;
-
-	if(rest < len) {
-		clip_pos = write_pos;
-		write_pos = 0;
-		rest = max_pos;
-	}
-	while(read_pos > write_pos && read_pos <= write_pos+len) {
-		if(!nr_omirr_open)
-			return 0;
-		interruptible_sleep_on(&write_wait);
-	}
-	return 1;
-}
-
-static /*inline*/ void write_space(int len)
-{
-	write_pos += len;
-	wake_up_interruptible(&read_wait);
-}
-
-static /*inline*/ int reserve_read_space(int len)
-{
-	int rest = clip_pos - read_pos;
-
-	if(!rest) {
-		read_pos = 0;
-		rest = clip_pos;
-		clip_pos = max_pos;
-	}
-	if(len > rest)
-		len = rest;
-	while(read_pos == write_pos) {
-		interruptible_sleep_on(&read_wait);
-	}
-	rest = write_pos - read_pos;
-	if(rest > 0 && rest < len)
-		len = rest;
-	return len;
-}
-
-static /*inline*/ void read_space(int len)
-{
-	read_pos += len;
-	if(read_pos >= clip_pos) {
-		read_pos = 0;
-		clip_pos = max_pos;
-	}
-	wake_up_interruptible(&write_wait);
-}
-
-static /*inline*/ void init_buffer(char * initxt)
-{
-	int len = initxt ? strlen(initxt) : 0;
-
-	if(!buffer) {
-		buffer = (char*)__get_free_page(GFP_USER);
-		max_pos = clip_pos = PAGE_SIZE;
-	}
-	read_pos = write_pos = 0;
-	memcpy(buffer, initxt, len);
-	write_space(len);
-}
-
-static int omirr_open(struct inode * inode, struct file * file)
-{
-	if(nr_omirr_open)
-		return -EAGAIN;
-	nr_omirr_open++;
-	if(!buffer)
-		init_buffer(NULL);
-	return 0;
-}
-
-static int omirr_release(struct inode * inode, struct file * file)
-{
-	nr_omirr_open--;
-	read_space(0);
-	return 0;
-}
-
-static long omirr_read(struct inode * inode, struct file * file,
-		       char * buf, unsigned long count)
-{
-	char * tmp;
-	int len;
-	int error = 0;
-
-	if(!count)
-		goto done;
-	error = -EINVAL;
-	if(!buf || count < 0)
-		goto done;
-	
-	error = verify_area(VERIFY_WRITE, buf, count);
-	if(error)
-		goto done;
-	
-	error = -EAGAIN;
-	if((file->f_flags & O_NONBLOCK) && read_pos == write_pos)
-		goto done;
-
-	error = len = reserve_read_space(count);
-	tmp = buffer + read_pos;
-	while(len) {
-		put_user(*tmp++, buf++);
-		len--;
-	}
-	read_space(error);
-done:
-	return error;		
-}
-
-int compute_name(struct dentry * entry, char * buf)
-{
-	int len;
-
-	if(IS_ROOT(entry)) {
-		*buf = '/';
-		return 1;
-	}
-	len = compute_name(entry->d_parent, buf);
-	if(len > 1) {
-		buf[len++] = '/';
-	}
-	memcpy(buf+len, entry->d_name, entry->d_len);
-	return len + entry->d_len;
-}
-
-int _omirr_print(struct dentry * ent1, struct dentry * ent2, 
-		struct qstr * suffix, const char * fmt,
-		 va_list args1, va_list args2)
-{
-	int count = strlen(fmt) + 10; /* estimate */
-	const char * tmp = fmt;
-	char lenbuf[8];
-	int res;
-
-	if(!buffer)
-		init_buffer(NULL);
-	while(*tmp) {
-		while(*tmp && *tmp++ != '%') ;
-		if(*tmp) {
-			if(*tmp == 's') {
-				char * str = va_arg(args1, char*);
-				count += strlen(str);
-			} else {
-				(void)va_arg(args1, int);
-				count += 8; /* estimate */
-			}
-		}
-	}
-	if(ent1) {
-		struct dentry * dent = ent1;
-		while(dent && !IS_ROOT(dent)) {
-			count += dent->d_len + 1;
-			dent = dent->d_parent;
-		}
-		count++;
-		if(ent2) {
-			dent = ent2;
-			while(dent && !IS_ROOT(dent)) {
-				count += dent->d_len + 1;
-				dent = dent->d_parent;
-			}
-		count++;
-		}
-		if(suffix)
-			count += suffix->len + 1;
-	}
-	
-	if((nr_omirr_open | cleared_flag) && reserve_write_space(count)) {
-		cleared_flag = 0;
-		res = vsprintf(buffer+write_pos+4, fmt, args2) + 4;
-		if(res > count)
-			printk("omirr: format estimate was wrong\n");
-		if(ent1) {
-			res += compute_name(ent1, buffer+write_pos+res);
-			if(ent2) {
-				buffer[write_pos+res++] = '\0';
-				res += compute_name(ent2, buffer+write_pos+res);
-			}
-			if(suffix) {
-				buffer[write_pos+res++] = '/';
-				memcpy(buffer+write_pos+res,
-				       suffix->name, suffix->len);
-				res += suffix->len;
-			}
-			buffer[write_pos+res++] = '\0';
-			buffer[write_pos+res++] = '\n';
-		}
-		sprintf(lenbuf, "%04d", res);
-		memcpy(buffer+write_pos, lenbuf, 4);
-	} else {
-		if(!cleared_flag) {
-			cleared_flag = 1;
-			init_buffer("0007 Z\n");
-		}
-		res = 0;
-	}
-	write_space(res);
-	return res;
-}
-
-int omirr_print(struct dentry * ent1, struct dentry * ent2, 
-		struct qstr * suffix, const char * fmt, ...)
-{
-	va_list args1, args2;
-	int res;
-
-	/* I don't know whether I could make a simple copy of the va_list,
-	 * so for the safe way...
-	 */
-	va_start(args1, fmt);
-	va_start(args2, fmt);
-	res = _omirr_print(ent1, ent2, suffix, fmt, args1, args2);
-	va_end(args2);
-	va_end(args1);
-	return res;
-}
-
-int omirr_printall(struct inode * inode, const char * fmt, ...)
-{
-	int res = 0;
-	struct dentry * tmp = inode->i_dentry;
-
-	if(tmp) do {
-		va_list args1, args2;
-		va_start(args1, fmt);
-		va_start(args2, fmt);
-		res += _omirr_print(tmp, NULL, NULL, fmt, args1, args2);
-		va_end(args2);
-		va_end(args1);
-		tmp = tmp->d_next;
-	} while(tmp != inode->i_dentry);
-	return res;
-}
-
-static struct file_operations omirr_operations = {
-    NULL,	/* omirr_lseek */
-    omirr_read,
-    NULL,	/* omirr_write */
-    NULL,	/* omirr_readdir */
-    NULL,	/* omirr_select */
-    NULL,	/* omirr_ioctl */
-    NULL,	/* mmap */
-    omirr_open,
-    NULL,	/* flush */
-    omirr_release,
-    NULL,	/* fsync */
-    NULL,       /* fasync */
-};
-
-struct inode_operations proc_omirr_inode_operations = {
-	&omirr_operations,
-};