--- linux/fs/minix/inode.c	2018/04/24 18:07:15	1.1.1.3
+++ linux/fs/minix/inode.c	2018/04/24 18:14:29	1.1.1.7
@@ -1,20 +1,29 @@
 /*
  *  linux/fs/minix/inode.c
  *
- *  (C) 1991  Linus Torvalds
+ *  Copyright (C) 1991, 1992  Linus Torvalds
  */
 
-#include <linux/string.h>
-#include <sys/stat.h>
-
 #include <linux/sched.h>
 #include <linux/minix_fs.h>
 #include <linux/kernel.h>
 #include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/stat.h>
+
 #include <asm/system.h>
+#include <asm/segment.h>
 
 int sync_dev(int dev);
 
+static inline void wait_on_buffer(struct buffer_head * bh)
+{
+	cli();
+	while (bh->b_lock)
+		sleep_on(&bh->b_wait);
+	sti();
+}
+
 void minix_put_inode(struct inode *inode)
 {
 	inode->i_size = 0;
@@ -29,9 +38,9 @@ void minix_put_super(struct super_block
 	lock_super(sb);
 	sb->s_dev = 0;
 	for(i = 0 ; i < MINIX_I_MAP_SLOTS ; i++)
-		brelse(sb->s_imap[i]);
+		brelse(sb->u.minix_sb.s_imap[i]);
 	for(i = 0 ; i < MINIX_Z_MAP_SLOTS ; i++)
-		brelse(sb->s_zmap[i]);
+		brelse(sb->u.minix_sb.s_zmap[i]);
 	free_super(sb);
 	return;
 }
@@ -40,23 +49,34 @@ static struct super_operations minix_sop
 	minix_read_inode,
 	minix_write_inode,
 	minix_put_inode,
-	minix_put_super
+	minix_put_super,
+	NULL,
+	minix_statfs
 };
 
 struct super_block *minix_read_super(struct super_block *s,void *data)
 {
 	struct buffer_head *bh;
+	struct minix_super_block *ms;
 	int i,dev=s->s_dev,block;
 
 	lock_super(s);
-	if (!(bh = bread(dev,1))) {
+	if (!(bh = bread(dev,1,BLOCK_SIZE))) {
 		s->s_dev=0;
 		free_super(s);
 		printk("bread failed\n");
 		return NULL;
 	}
-	*((struct minix_super_block *) s) =
-		*((struct minix_super_block *) bh->b_data);
+	ms = (struct minix_super_block *) bh->b_data;
+	s->s_blocksize = 1024;
+	s->u.minix_sb.s_ninodes = ms->s_ninodes;
+	s->u.minix_sb.s_nzones = ms->s_nzones;
+	s->u.minix_sb.s_imap_blocks = ms->s_imap_blocks;
+	s->u.minix_sb.s_zmap_blocks = ms->s_zmap_blocks;
+	s->u.minix_sb.s_firstdatazone = ms->s_firstdatazone;
+	s->u.minix_sb.s_log_zone_size = ms->s_log_zone_size;
+	s->u.minix_sb.s_max_size = ms->s_max_size;
+	s->s_magic = ms->s_magic;
 	brelse(bh);
 	if (s->s_magic != MINIX_SUPER_MAGIC) {
 		s->s_dev = 0;
@@ -65,32 +85,32 @@ struct super_block *minix_read_super(str
 		return NULL;
 	}
 	for (i=0;i < MINIX_I_MAP_SLOTS;i++)
-		s->s_imap[i] = NULL;
+		s->u.minix_sb.s_imap[i] = NULL;
 	for (i=0;i < MINIX_Z_MAP_SLOTS;i++)
-		s->s_zmap[i] = NULL;
+		s->u.minix_sb.s_zmap[i] = NULL;
 	block=2;
-	for (i=0 ; i < s->s_imap_blocks ; i++)
-		if (s->s_imap[i]=bread(dev,block))
+	for (i=0 ; i < s->u.minix_sb.s_imap_blocks ; i++)
+		if (s->u.minix_sb.s_imap[i]=bread(dev,block,BLOCK_SIZE))
 			block++;
 		else
 			break;
-	for (i=0 ; i < s->s_zmap_blocks ; i++)
-		if (s->s_zmap[i]=bread(dev,block))
+	for (i=0 ; i < s->u.minix_sb.s_zmap_blocks ; i++)
+		if (s->u.minix_sb.s_zmap[i]=bread(dev,block,BLOCK_SIZE))
 			block++;
 		else
 			break;
-	if (block != 2+s->s_imap_blocks+s->s_zmap_blocks) {
+	if (block != 2+s->u.minix_sb.s_imap_blocks+s->u.minix_sb.s_zmap_blocks) {
 		for(i=0;i<MINIX_I_MAP_SLOTS;i++)
-			brelse(s->s_imap[i]);
+			brelse(s->u.minix_sb.s_imap[i]);
 		for(i=0;i<MINIX_Z_MAP_SLOTS;i++)
-			brelse(s->s_zmap[i]);
+			brelse(s->u.minix_sb.s_zmap[i]);
 		s->s_dev=0;
 		free_super(s);
 		printk("block failed\n");
 		return NULL;
 	}
-	s->s_imap[0]->b_data[0] |= 1;
-	s->s_zmap[0]->b_data[0] |= 1;
+	s->u.minix_sb.s_imap[0]->b_data[0] |= 1;
+	s->u.minix_sb.s_zmap[0]->b_data[0] |= 1;
 	free_super(s);
 	/* set up enough so that it can read an inode */
 	s->s_dev = dev;
@@ -103,86 +123,185 @@ struct super_block *minix_read_super(str
 	return s;
 }
 
-static int _minix_bmap(struct inode * inode,int block,int create)
+void minix_statfs (struct super_block *sb, struct statfs *buf)
+{
+	long tmp;
+
+	put_fs_long(MINIX_SUPER_MAGIC, &buf->f_type);
+	put_fs_long(1024, &buf->f_bsize);
+	put_fs_long(sb->u.minix_sb.s_nzones << sb->u.minix_sb.s_log_zone_size, &buf->f_blocks);
+	tmp = minix_count_free_blocks(sb);
+	put_fs_long(tmp, &buf->f_bfree);
+	put_fs_long(tmp, &buf->f_bavail);
+	put_fs_long(sb->u.minix_sb.s_ninodes, &buf->f_files);
+	put_fs_long(minix_count_free_inodes(sb), &buf->f_ffree);
+	/* Don't know what value to put in buf->f_fsid */
+}
+
+#define inode_bmap(inode,nr) ((inode)->u.minix_i.i_data[(nr)])
+
+static int block_bmap(struct buffer_head * bh, int nr)
+{
+	int tmp;
+
+	if (!bh)
+		return 0;
+	tmp = ((unsigned short *) bh->b_data)[nr];
+	brelse(bh);
+	return tmp;
+}
+
+int minix_bmap(struct inode * inode,int block)
 {
-	struct buffer_head * bh;
 	int i;
 
 	if (block<0) {
-		printk("_minix_bmap: block<0");
+		printk("minix_bmap: block<0");
 		return 0;
 	}
 	if (block >= 7+512+512*512) {
-		printk("_minix_bmap: block>big");
+		printk("minix_bmap: block>big");
 		return 0;
 	}
-	if (block<7) {
-		if (create && !inode->i_data[block])
-			if (inode->i_data[block]=minix_new_block(inode->i_dev)) {
-				inode->i_ctime=CURRENT_TIME;
-				inode->i_dirt=1;
-			}
-		return inode->i_data[block];
-	}
+	if (block < 7)
+		return inode_bmap(inode,block);
 	block -= 7;
-	if (block<512) {
-		if (create && !inode->i_data[7])
-			if (inode->i_data[7]=minix_new_block(inode->i_dev)) {
-				inode->i_dirt=1;
-				inode->i_ctime=CURRENT_TIME;
-			}
-		if (!inode->i_data[7])
-			return 0;
-		if (!(bh = bread(inode->i_dev,inode->i_data[7])))
+	if (block < 512) {
+		i = inode_bmap(inode,7);
+		if (!i)
 			return 0;
-		i = ((unsigned short *) (bh->b_data))[block];
-		if (create && !i)
-			if (i=minix_new_block(inode->i_dev)) {
-				((unsigned short *) (bh->b_data))[block]=i;
-				bh->b_dirt=1;
-			}
-		brelse(bh);
-		return i;
+		return block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block);
 	}
 	block -= 512;
-	if (create && !inode->i_data[8])
-		if (inode->i_data[8]=minix_new_block(inode->i_dev)) {
-			inode->i_dirt=1;
-			inode->i_ctime=CURRENT_TIME;
-		}
-	if (!inode->i_data[8])
-		return 0;
-	if (!(bh=bread(inode->i_dev,inode->i_data[8])))
-		return 0;
-	i = ((unsigned short *)bh->b_data)[block>>9];
-	if (create && !i)
-		if (i=minix_new_block(inode->i_dev)) {
-			((unsigned short *) (bh->b_data))[block>>9]=i;
-			bh->b_dirt=1;
-		}
-	brelse(bh);
+	i = inode_bmap(inode,8);
 	if (!i)
 		return 0;
-	if (!(bh=bread(inode->i_dev,i)))
+	i = block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block>>9);
+	if (!i)
 		return 0;
-	i = ((unsigned short *)bh->b_data)[block&511];
-	if (create && !i)
-		if (i=minix_new_block(inode->i_dev)) {
-			((unsigned short *) (bh->b_data))[block&511]=i;
-			bh->b_dirt=1;
+	return block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block & 511);
+}
+
+static struct buffer_head * inode_getblk(struct inode * inode, int nr, int create)
+{
+	int tmp;
+	unsigned short *p;
+	struct buffer_head * result;
+
+	p = inode->u.minix_i.i_data + nr;
+repeat:
+	tmp = *p;
+	if (tmp) {
+		result = getblk(inode->i_dev, tmp, BLOCK_SIZE);
+		if (tmp == *p)
+			return result;
+		brelse(result);
+		goto repeat;
+	}
+	if (!create)
+		return NULL;
+	tmp = minix_new_block(inode->i_dev);
+	if (!tmp)
+		return NULL;
+	result = getblk(inode->i_dev, tmp, BLOCK_SIZE);
+	if (*p) {
+		minix_free_block(inode->i_dev,tmp);
+		brelse(result);
+		goto repeat;
+	}
+	*p = tmp;
+	inode->i_ctime = CURRENT_TIME;
+	inode->i_dirt = 1;
+	return result;
+}
+
+static struct buffer_head * block_getblk(struct buffer_head * bh, int nr, int create)
+{
+	int tmp;
+	unsigned short *p;
+	struct buffer_head * result;
+
+	if (!bh)
+		return NULL;
+	if (!bh->b_uptodate) {
+		ll_rw_block(READ,bh);
+		wait_on_buffer(bh);
+		if (!bh->b_uptodate) {
+			brelse(bh);
+			return NULL;
+		}
+	}
+	p = nr + (unsigned short *) bh->b_data;
+repeat:
+	tmp = *p;
+	if (tmp) {
+		result = getblk(bh->b_dev, tmp, BLOCK_SIZE);
+		if (tmp == *p) {
+			brelse(bh);
+			return result;
 		}
+		brelse(result);
+		goto repeat;
+	}
+	if (!create) {
+		brelse(bh);
+		return NULL;
+	}
+	tmp = minix_new_block(bh->b_dev);
+	if (!tmp) {
+		brelse(bh);
+		return NULL;
+	}
+	result = getblk(bh->b_dev, tmp, BLOCK_SIZE);
+	if (*p) {
+		minix_free_block(bh->b_dev,tmp);
+		brelse(result);
+		goto repeat;
+	}
+	*p = tmp;
+	bh->b_dirt = 1;
 	brelse(bh);
-	return i;
+	return result;
 }
 
-int minix_bmap(struct inode * inode,int block)
+struct buffer_head * minix_getblk(struct inode * inode, int block, int create)
 {
-	return _minix_bmap(inode,block,0);
+	struct buffer_head * bh;
+
+	if (block<0) {
+		printk("minix_getblk: block<0");
+		return NULL;
+	}
+	if (block >= 7+512+512*512) {
+		printk("minix_getblk: block>big");
+		return NULL;
+	}
+	if (block < 7)
+		return inode_getblk(inode,block,create);
+	block -= 7;
+	if (block < 512) {
+		bh = inode_getblk(inode,7,create);
+		return block_getblk(bh,block,create);
+	}
+	block -= 512;
+	bh = inode_getblk(inode,8,create);
+	bh = block_getblk(bh,block>>9,create);
+	return block_getblk(bh,block & 511,create);
 }
 
-int minix_create_block(struct inode * inode, int block)
+struct buffer_head * minix_bread(struct inode * inode, int block, int create)
 {
-	return _minix_bmap(inode,block,1);
+	struct buffer_head * bh;
+
+	bh = minix_getblk(inode,block,create);
+	if (!bh || bh->b_uptodate)
+		return bh;
+	ll_rw_block(READ,bh);
+	wait_on_buffer(bh);
+	if (bh->b_uptodate)
+		return bh;
+	brelse(bh);
+	return NULL;
 }
 
 void minix_read_inode(struct inode * inode)
@@ -191,9 +310,9 @@ void minix_read_inode(struct inode * ino
 	struct minix_inode * raw_inode;
 	int block;
 
-	block = 2 + inode->i_sb->s_imap_blocks + inode->i_sb->s_zmap_blocks +
+	block = 2 + inode->i_sb->u.minix_sb.s_imap_blocks + inode->i_sb->u.minix_sb.s_zmap_blocks +
 		(inode->i_ino-1)/MINIX_INODES_PER_BLOCK;
-	if (!(bh=bread(inode->i_dev,block)))
+	if (!(bh=bread(inode->i_dev,block, BLOCK_SIZE)))
 		panic("unable to read i-node block");
 	raw_inode = ((struct minix_inode *) bh->b_data) +
 		(inode->i_ino-1)%MINIX_INODES_PER_BLOCK;
@@ -203,10 +322,11 @@ void minix_read_inode(struct inode * ino
 	inode->i_nlink = raw_inode->i_nlinks;
 	inode->i_size = raw_inode->i_size;
 	inode->i_mtime = inode->i_atime = inode->i_ctime = raw_inode->i_time;
+	inode->i_blocks = inode->i_blksize = 0;
 	if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
 		inode->i_rdev = raw_inode->i_zone[0];
 	else for (block = 0; block < 9; block++)
-		inode->i_data[block] = raw_inode->i_zone[block];
+		inode->u.minix_i.i_data[block] = raw_inode->i_zone[block];
 	brelse(bh);
 	inode->i_op = NULL;
 	if (S_ISREG(inode->i_mode))
@@ -219,6 +339,14 @@ void minix_read_inode(struct inode * ino
 		inode->i_op = &minix_chrdev_inode_operations;
 	else if (S_ISBLK(inode->i_mode))
 		inode->i_op = &minix_blkdev_inode_operations;
+	else if (S_ISFIFO(inode->i_mode)) {
+		inode->i_op = &minix_fifo_inode_operations;
+		inode->i_pipe = 1;
+		PIPE_BASE(*inode) = NULL;
+		PIPE_HEAD(*inode) = PIPE_TAIL(*inode) = 0;
+		PIPE_READ_WAIT(*inode) = PIPE_WRITE_WAIT(*inode) = NULL;
+		PIPE_READERS(*inode) = PIPE_WRITERS(*inode) = 0;
+	}
 }
 
 void minix_write_inode(struct inode * inode)
@@ -227,9 +355,9 @@ void minix_write_inode(struct inode * in
 	struct minix_inode * raw_inode;
 	int block;
 
-	block = 2 + inode->i_sb->s_imap_blocks + inode->i_sb->s_zmap_blocks +
+	block = 2 + inode->i_sb->u.minix_sb.s_imap_blocks + inode->i_sb->u.minix_sb.s_zmap_blocks +
 		(inode->i_ino-1)/MINIX_INODES_PER_BLOCK;
-	if (!(bh=bread(inode->i_dev,block)))
+	if (!(bh=bread(inode->i_dev, block, BLOCK_SIZE)))
 		panic("unable to read i-node block");
 	raw_inode = ((struct minix_inode *)bh->b_data) +
 		(inode->i_ino-1)%MINIX_INODES_PER_BLOCK;
@@ -242,7 +370,7 @@ void minix_write_inode(struct inode * in
 	if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
 		raw_inode->i_zone[0] = inode->i_rdev;
 	else for (block = 0; block < 9; block++)
-		raw_inode->i_zone[block] = inode->i_data[block];
+		raw_inode->i_zone[block] = inode->u.minix_i.i_data[block];
 	bh->b_dirt=1;
 	inode->i_dirt=0;
 	brelse(bh);