Import of Linus's Linux 1.1.68

1 files changed, 513 insertions, 0 deletions

diff --git a/fs/minix/inode.c b/fs/minix/inode.c
new file mode 100644
index 000000000..2aeb538ee
--- /dev/null
+++ b/fs/minix/inode.c
@@ -0,0 +1,513 @@
+/*
+ *  linux/fs/minix/inode.c
+ *
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ */
+
+#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 <linux/locks.h>
+
+#include <asm/system.h>
+#include <asm/segment.h>
+#include <asm/bitops.h>
+
+void minix_put_inode(struct inode *inode)
+{
+	if (inode->i_nlink)
+		return;
+	inode->i_size = 0;
+	minix_truncate(inode);
+	minix_free_inode(inode);
+}
+
+static void minix_commit_super (struct super_block * sb,
+			       struct minix_super_block * ms)
+{
+	mark_buffer_dirty(sb->u.minix_sb.s_sbh, 1);
+	sb->s_dirt = 0;
+}
+
+void minix_write_super (struct super_block * sb)
+{
+	struct minix_super_block * ms;
+
+	if (!(sb->s_flags & MS_RDONLY)) {
+		ms = sb->u.minix_sb.s_ms;
+
+		if (ms->s_state & MINIX_VALID_FS)
+			ms->s_state &= ~MINIX_VALID_FS;
+		minix_commit_super (sb, ms);
+	}
+	sb->s_dirt = 0;
+}
+
+
+void minix_put_super(struct super_block *sb)
+{
+	int i;
+
+	lock_super(sb);
+	if (!(sb->s_flags & MS_RDONLY)) {
+		sb->u.minix_sb.s_ms->s_state = sb->u.minix_sb.s_mount_state;
+		mark_buffer_dirty(sb->u.minix_sb.s_sbh, 1);
+	}
+	sb->s_dev = 0;
+	for(i = 0 ; i < MINIX_I_MAP_SLOTS ; i++)
+		brelse(sb->u.minix_sb.s_imap[i]);
+	for(i = 0 ; i < MINIX_Z_MAP_SLOTS ; i++)
+		brelse(sb->u.minix_sb.s_zmap[i]);
+	brelse (sb->u.minix_sb.s_sbh);
+	unlock_super(sb);
+	return;
+}
+
+static struct super_operations minix_sops = { 
+	minix_read_inode,
+	NULL,
+	minix_write_inode,
+	minix_put_inode,
+	minix_put_super,
+	minix_write_super,
+	minix_statfs,
+	minix_remount
+};
+
+int minix_remount (struct super_block * sb, int * flags, char * data)
+{
+	struct minix_super_block * ms;
+
+	ms = sb->u.minix_sb.s_ms;
+	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
+		return 0;
+	if (*flags & MS_RDONLY) {
+		if (ms->s_state & MINIX_VALID_FS ||
+		    !(sb->u.minix_sb.s_mount_state & MINIX_VALID_FS))
+			return 0;
+		/* Mounting a rw partition read-only. */
+		ms->s_state = sb->u.minix_sb.s_mount_state;
+		mark_buffer_dirty(sb->u.minix_sb.s_sbh, 1);
+		sb->s_dirt = 1;
+		minix_commit_super (sb, ms);
+	}
+	else {
+	  	/* Mount a partition which is read-only, read-write. */
+		sb->u.minix_sb.s_mount_state = ms->s_state;
+		ms->s_state &= ~MINIX_VALID_FS;
+		mark_buffer_dirty(sb->u.minix_sb.s_sbh, 1);
+		sb->s_dirt = 1;
+
+		if (!(sb->u.minix_sb.s_mount_state & MINIX_VALID_FS))
+			printk ("MINIX-fs warning: remounting unchecked fs, "
+				"running fsck is recommended.\n");
+		else if ((sb->u.minix_sb.s_mount_state & MINIX_ERROR_FS))
+			printk ("MINIX-fs warning: remounting fs with errors, "
+				"running fsck is recommended.\n");
+	}
+	return 0;
+}
+
+
+struct super_block *minix_read_super(struct super_block *s,void *data, 
+				     int silent)
+{
+	struct buffer_head *bh;
+	struct minix_super_block *ms;
+	int i,dev=s->s_dev,block;
+
+	if (32 != sizeof (struct minix_inode))
+		panic("bad i-node size");
+	lock_super(s);
+	set_blocksize(dev, BLOCK_SIZE);
+	if (!(bh = bread(dev,1,BLOCK_SIZE))) {
+		s->s_dev=0;
+		unlock_super(s);
+		printk("MINIX-fs: unable to read superblock\n");
+		return NULL;
+	}
+	ms = (struct minix_super_block *) bh->b_data;
+	s->u.minix_sb.s_ms = ms;
+	s->u.minix_sb.s_sbh = bh;
+	s->u.minix_sb.s_mount_state = ms->s_state;
+	s->s_blocksize = 1024;
+	s->s_blocksize_bits = 10;
+	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;
+	if (s->s_magic == MINIX_SUPER_MAGIC) {
+		s->u.minix_sb.s_dirsize = 16;
+		s->u.minix_sb.s_namelen = 14;
+	} else if (s->s_magic == MINIX_SUPER_MAGIC2) {
+		s->u.minix_sb.s_dirsize = 32;
+		s->u.minix_sb.s_namelen = 30;
+	} else {
+		s->s_dev = 0;
+		unlock_super(s);
+		brelse(bh);
+		if (!silent)
+			printk("VFS: Can't find a minix filesystem on dev 0x%04x.\n", dev);
+		return NULL;
+	}
+	for (i=0;i < MINIX_I_MAP_SLOTS;i++)
+		s->u.minix_sb.s_imap[i] = NULL;
+	for (i=0;i < MINIX_Z_MAP_SLOTS;i++)
+		s->u.minix_sb.s_zmap[i] = NULL;
+	block=2;
+	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)) != NULL)
+			block++;
+		else
+			break;
+	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)) != NULL)
+			block++;
+		else
+			break;
+	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->u.minix_sb.s_imap[i]);
+		for(i=0;i<MINIX_Z_MAP_SLOTS;i++)
+			brelse(s->u.minix_sb.s_zmap[i]);
+		s->s_dev=0;
+		unlock_super(s);
+		brelse(bh);
+		printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
+		return NULL;
+	}
+	set_bit(0,s->u.minix_sb.s_imap[0]->b_data);
+	set_bit(0,s->u.minix_sb.s_zmap[0]->b_data);
+	unlock_super(s);
+	/* set up enough so that it can read an inode */
+	s->s_dev = dev;
+	s->s_op = &minix_sops;
+	s->s_mounted = iget(s,MINIX_ROOT_INO);
+	if (!s->s_mounted) {
+		s->s_dev = 0;
+		brelse(bh);
+		printk("MINIX-fs: get root inode failed\n");
+		return NULL;
+	}
+	if (!(s->s_flags & MS_RDONLY)) {
+		ms->s_state &= ~MINIX_VALID_FS;
+		mark_buffer_dirty(bh, 1);
+		s->s_dirt = 1;
+	}
+	if (!(s->u.minix_sb.s_mount_state & MINIX_VALID_FS))
+		printk ("MINIX-fs: mounting unchecked file system, "
+			"running fsck is recommended.\n");
+ 	else if (s->u.minix_sb.s_mount_state & MINIX_ERROR_FS)
+		printk ("MINIX-fs: mounting file system with errors, "
+			"running fsck is recommended.\n");
+	return s;
+}
+
+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);
+	tmp = sb->u.minix_sb.s_nzones - sb->u.minix_sb.s_firstdatazone;
+	tmp <<= sb->u.minix_sb.s_log_zone_size;
+	put_fs_long(tmp, &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);
+	put_fs_long(sb->u.minix_sb.s_namelen, &buf->f_namelen);
+	/* 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)
+{
+	int i;
+
+	if (block<0) {
+		printk("minix_bmap: block<0");
+		return 0;
+	}
+	if (block >= 7+512+512*512) {
+		printk("minix_bmap: block>big");
+		return 0;
+	}
+	if (block < 7)
+		return inode_bmap(inode,block);
+	block -= 7;
+	if (block < 512) {
+		i = inode_bmap(inode,7);
+		if (!i)
+			return 0;
+		return block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block);
+	}
+	block -= 512;
+	i = inode_bmap(inode,8);
+	if (!i)
+		return 0;
+	i = block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block>>9);
+	if (!i)
+		return 0;
+	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_sb);
+	if (!tmp)
+		return NULL;
+	result = getblk(inode->i_dev, tmp, BLOCK_SIZE);
+	if (*p) {
+		minix_free_block(inode->i_sb,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 inode * inode, 
+	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, 1, &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(inode->i_sb);
+	if (!tmp) {
+		brelse(bh);
+		return NULL;
+	}
+	result = getblk(bh->b_dev, tmp, BLOCK_SIZE);
+	if (*p) {
+		minix_free_block(inode->i_sb,tmp);
+		brelse(result);
+		goto repeat;
+	}
+	*p = tmp;
+	mark_buffer_dirty(bh, 1);
+	brelse(bh);
+	return result;
+}
+
+struct buffer_head * minix_getblk(struct inode * inode, int block, int create)
+{
+	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(inode, bh, block, create);
+	}
+	block -= 512;
+	bh = inode_getblk(inode,8,create);
+	bh = block_getblk(inode, bh, block>>9, create);
+	return block_getblk(inode, bh, block & 511, create);
+}
+
+struct buffer_head * minix_bread(struct inode * inode, int block, int create)
+{
+	struct buffer_head * bh;
+
+	bh = minix_getblk(inode,block,create);
+	if (!bh || bh->b_uptodate)
+		return bh;
+	ll_rw_block(READ, 1, &bh);
+	wait_on_buffer(bh);
+	if (bh->b_uptodate)
+		return bh;
+	brelse(bh);
+	return NULL;
+}
+
+void minix_read_inode(struct inode * inode)
+{
+	struct buffer_head * bh;
+	struct minix_inode * raw_inode;
+	int block, ino;
+
+	ino = inode->i_ino;
+	inode->i_op = NULL;
+	inode->i_mode = 0;
+	if (!ino || ino >= inode->i_sb->u.minix_sb.s_ninodes) {
+		printk("Bad inode number on dev 0x%04x: %d is out of range\n",
+			inode->i_dev, ino);
+		return;
+	}
+	block = 2 + inode->i_sb->u.minix_sb.s_imap_blocks +
+		    inode->i_sb->u.minix_sb.s_zmap_blocks +
+		    (ino-1)/MINIX_INODES_PER_BLOCK;
+	if (!(bh=bread(inode->i_dev,block, BLOCK_SIZE))) {
+		printk("Major problem: unable to read inode from dev 0x%04x\n",
+			inode->i_dev);
+		return;
+	}
+	raw_inode = ((struct minix_inode *) bh->b_data) +
+		    (ino-1)%MINIX_INODES_PER_BLOCK;
+	inode->i_mode = raw_inode->i_mode;
+	inode->i_uid = raw_inode->i_uid;
+	inode->i_gid = raw_inode->i_gid;
+	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->u.minix_i.i_data[block] = raw_inode->i_zone[block];
+	brelse(bh);
+	if (S_ISREG(inode->i_mode))
+		inode->i_op = &minix_file_inode_operations;
+	else if (S_ISDIR(inode->i_mode))
+		inode->i_op = &minix_dir_inode_operations;
+	else if (S_ISLNK(inode->i_mode))
+		inode->i_op = &minix_symlink_inode_operations;
+	else if (S_ISCHR(inode->i_mode))
+		inode->i_op = &chrdev_inode_operations;
+	else if (S_ISBLK(inode->i_mode))
+		inode->i_op = &blkdev_inode_operations;
+	else if (S_ISFIFO(inode->i_mode))
+		init_fifo(inode);
+}
+
+static struct buffer_head * minix_update_inode(struct inode * inode)
+{
+	struct buffer_head * bh;
+	struct minix_inode * raw_inode;
+	int ino, block;
+
+	ino = inode->i_ino;
+	if (!ino || ino >= inode->i_sb->u.minix_sb.s_ninodes) {
+		printk("Bad inode number on dev 0x%04x: %d is out of range\n",
+			inode->i_dev, ino);
+		inode->i_dirt = 0;
+		return 0;
+	}
+	block = 2 + inode->i_sb->u.minix_sb.s_imap_blocks + inode->i_sb->u.minix_sb.s_zmap_blocks +
+		(ino-1)/MINIX_INODES_PER_BLOCK;
+	if (!(bh=bread(inode->i_dev, block, BLOCK_SIZE))) {
+		printk("unable to read i-node block\n");
+		inode->i_dirt = 0;
+		return 0;
+	}
+	raw_inode = ((struct minix_inode *)bh->b_data) +
+		(ino-1)%MINIX_INODES_PER_BLOCK;
+	raw_inode->i_mode = inode->i_mode;
+	raw_inode->i_uid = inode->i_uid;
+	raw_inode->i_gid = inode->i_gid;
+	raw_inode->i_nlinks = inode->i_nlink;
+	raw_inode->i_size = inode->i_size;
+	raw_inode->i_time = inode->i_mtime;
+	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->u.minix_i.i_data[block];
+	inode->i_dirt=0;
+	mark_buffer_dirty(bh, 1);
+	return bh;
+}
+
+void minix_write_inode(struct inode * inode)
+{
+	struct buffer_head *bh;
+	bh = minix_update_inode(inode);
+	brelse(bh);
+}
+
+int minix_sync_inode(struct inode * inode)
+{
+	int err = 0;
+	struct buffer_head *bh;
+
+	bh = minix_update_inode(inode);
+	if (bh && bh->b_dirt)
+	{
+		ll_rw_block(WRITE, 1, &bh);
+		wait_on_buffer(bh);
+		if (bh->b_req && !bh->b_uptodate)
+		{
+			printk ("IO error syncing minix inode [%04x:%08lx]\n",
+				inode->i_dev, inode->i_ino);
+			err = -1;
+		}
+	}
+	else if (!bh)
+		err = -1;
+	brelse (bh);
+	return err;
+}