1 files changed, 444 insertions, 0 deletions

diff --git a/fs/ext/inode.c b/fs/ext/inode.c
new file mode 100644
index 000000000..b3ca2e2cf
--- /dev/null
+++ b/fs/ext/inode.c
@@ -0,0 +1,444 @@
+/*
+ *  linux/fs/ext/inode.c
+ *
+ *  Copyright (C) 1992  Remy Card (card@masi.ibp.fr)
+ *
+ *  from
+ *
+ *  linux/fs/minix/inode.c
+ *
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ */
+
+#include <linux/sched.h>
+#include <linux/ext_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>
+
+void ext_put_inode(struct inode *inode)
+{
+	if (inode->i_nlink)
+		return;
+	inode->i_size = 0;
+	ext_truncate(inode);
+	ext_free_inode(inode);
+}
+
+void ext_put_super(struct super_block *sb)
+{
+
+	lock_super(sb);
+	sb->s_dev = 0;
+	if (sb->u.ext_sb.s_firstfreeinodeblock)
+		brelse (sb->u.ext_sb.s_firstfreeinodeblock);
+	if (sb->u.ext_sb.s_firstfreeblock)
+		brelse (sb->u.ext_sb.s_firstfreeblock);
+	unlock_super(sb);
+	return;
+}
+
+static struct super_operations ext_sops = { 
+	ext_read_inode,
+	NULL,
+	ext_write_inode,
+	ext_put_inode,
+	ext_put_super,
+	ext_write_super,
+	ext_statfs,
+	NULL
+};
+
+struct super_block *ext_read_super(struct super_block *s,void *data, 
+				   int silent)
+{
+	struct buffer_head *bh;
+	struct ext_super_block *es;
+	int dev = s->s_dev,block;
+
+	lock_super(s);
+	set_blocksize(dev, BLOCK_SIZE);
+	if (!(bh = bread(dev, 1, BLOCK_SIZE))) {
+		s->s_dev=0;
+		unlock_super(s);
+		printk("EXT-fs: unable to read superblock\n");
+		return NULL;
+	}
+	es = (struct ext_super_block *) bh->b_data;
+	s->s_blocksize = 1024;
+	s->s_blocksize_bits = 10;
+	s->u.ext_sb.s_ninodes = es->s_ninodes;
+	s->u.ext_sb.s_nzones = es->s_nzones;
+	s->u.ext_sb.s_firstdatazone = es->s_firstdatazone;
+	s->u.ext_sb.s_log_zone_size = es->s_log_zone_size;
+	s->u.ext_sb.s_max_size = es->s_max_size;
+	s->s_magic = es->s_magic;
+	s->u.ext_sb.s_firstfreeblocknumber = es->s_firstfreeblock;
+	s->u.ext_sb.s_freeblockscount = es->s_freeblockscount;
+	s->u.ext_sb.s_firstfreeinodenumber = es->s_firstfreeinode;
+	s->u.ext_sb.s_freeinodescount = es->s_freeinodescount;
+	brelse(bh);
+	if (s->s_magic != EXT_SUPER_MAGIC) {
+		s->s_dev = 0;
+		unlock_super(s);
+		if (!silent)
+			printk("VFS: Can't find an extfs filesystem on dev 0x%04x.\n",
+				   dev);
+		return NULL;
+	}
+	if (!s->u.ext_sb.s_firstfreeblocknumber)
+		s->u.ext_sb.s_firstfreeblock = NULL;
+	else
+		if (!(s->u.ext_sb.s_firstfreeblock = bread(dev,
+			s->u.ext_sb.s_firstfreeblocknumber, BLOCK_SIZE))) {
+			printk("ext_read_super: unable to read first free block\n");
+			s->s_dev = 0;
+			unlock_super(s);
+			return NULL;
+		}
+	if (!s->u.ext_sb.s_firstfreeinodenumber)
+		s->u.ext_sb.s_firstfreeinodeblock = NULL;
+	else {
+		block = 2 + (s->u.ext_sb.s_firstfreeinodenumber - 1) / EXT_INODES_PER_BLOCK;
+		if (!(s->u.ext_sb.s_firstfreeinodeblock = bread(dev, block, BLOCK_SIZE))) {
+			printk("ext_read_super: unable to read first free inode block\n");
+			brelse(s->u.ext_sb.s_firstfreeblock);
+			s->s_dev = 0;
+			unlock_super (s);
+			return NULL;
+		}
+	}
+	unlock_super(s);
+	/* set up enough so that it can read an inode */
+	s->s_dev = dev;
+	s->s_op = &ext_sops;
+	if (!(s->s_mounted = iget(s,EXT_ROOT_INO))) {
+		s->s_dev=0;
+		printk("EXT-fs: get root inode failed\n");
+		return NULL;
+	}
+	return s;
+}
+
+void ext_write_super (struct super_block *sb)
+{
+	struct buffer_head * bh;
+	struct ext_super_block * es;
+
+	if (!(bh = bread(sb->s_dev, 1, BLOCK_SIZE))) {
+		printk ("ext_write_super: bread failed\n");
+		return;
+	}
+	es = (struct ext_super_block *) bh->b_data;
+	es->s_firstfreeblock = sb->u.ext_sb.s_firstfreeblocknumber;
+	es->s_freeblockscount = sb->u.ext_sb.s_freeblockscount;
+	es->s_firstfreeinode = sb->u.ext_sb.s_firstfreeinodenumber;
+	es->s_freeinodescount = sb->u.ext_sb.s_freeinodescount;
+	mark_buffer_dirty(bh, 1);
+	brelse (bh);
+	sb->s_dirt = 0;
+}
+
+void ext_statfs (struct super_block *sb, struct statfs *buf)
+{
+	long tmp;
+
+	put_fs_long(EXT_SUPER_MAGIC, &buf->f_type);
+	put_fs_long(1024, &buf->f_bsize);
+	put_fs_long(sb->u.ext_sb.s_nzones << sb->u.ext_sb.s_log_zone_size,
+		&buf->f_blocks);
+	tmp = ext_count_free_blocks(sb);
+	put_fs_long(tmp, &buf->f_bfree);
+	put_fs_long(tmp, &buf->f_bavail);
+	put_fs_long(sb->u.ext_sb.s_ninodes, &buf->f_files);
+	put_fs_long(ext_count_free_inodes(sb), &buf->f_ffree);
+	put_fs_long(EXT_NAME_LEN, &buf->f_namelen);
+	/* Don't know what value to put in buf->f_fsid */
+}
+
+#define inode_bmap(inode,nr) ((inode)->u.ext_i.i_data[(nr)])
+
+static int block_bmap(struct buffer_head * bh, int nr)
+{
+	int tmp;
+
+	if (!bh)
+		return 0;
+	tmp = ((unsigned long *) bh->b_data)[nr];
+	brelse(bh);
+	return tmp;
+}
+
+int ext_bmap(struct inode * inode,int block)
+{
+	int i;
+
+	if (block<0) {
+		printk("ext_bmap: block<0");
+		return 0;
+	}
+	if (block >= 9+256+256*256+256*256*256) {
+		printk("ext_bmap: block>big");
+		return 0;
+	}
+	if (block<9)
+		return inode_bmap(inode,block);
+	block -= 9;
+	if (block<256) {
+		i = inode_bmap(inode,9);
+		if (!i)
+			return 0;
+		return block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block);
+	}
+	block -= 256;
+	if (block<256*256) {
+		i = inode_bmap(inode,10);
+		if (!i)
+			return 0;
+		i = block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block>>8);
+		if (!i)
+			return 0;
+		return block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block & 255);
+	}
+	block -= 256*256;
+	i = inode_bmap(inode,11);
+	if (!i)
+		return 0;
+	i = block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block>>16);
+	if (!i)
+		return 0;
+	i = block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),(block>>8) & 255);
+	if (!i)
+		return 0;
+	return block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block & 255);
+}
+
+static struct buffer_head * inode_getblk(struct inode * inode, int nr, int create)
+{
+	int tmp;
+	unsigned long * p;
+	struct buffer_head * result;
+
+	p = inode->u.ext_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 = ext_new_block(inode->i_sb);
+	if (!tmp)
+		return NULL;
+	result = getblk(inode->i_dev, tmp, BLOCK_SIZE);
+	if (*p) {
+		ext_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 long * 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 long *) 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 = ext_new_block(inode->i_sb);
+	if (!tmp) {
+		brelse(bh);
+		return NULL;
+	}
+	result = getblk(bh->b_dev, tmp, BLOCK_SIZE);
+	if (*p) {
+		ext_free_block(inode->i_sb,tmp);
+		brelse(result);
+		goto repeat;
+	}
+	*p = tmp;
+	mark_buffer_dirty(bh, 1);
+	brelse(bh);
+	return result;
+}
+
+struct buffer_head * ext_getblk(struct inode * inode, int block, int create)
+{
+	struct buffer_head * bh;
+
+	if (block<0) {
+		printk("ext_getblk: block<0\n");
+		return NULL;
+	}
+	if (block >= 9+256+256*256+256*256*256) {
+		printk("ext_getblk: block>big\n");
+		return NULL;
+	}
+	if (block<9)
+		return inode_getblk(inode,block,create);
+	block -= 9;
+	if (block<256) {
+		bh = inode_getblk(inode,9,create);
+		return block_getblk(inode,bh,block,create);
+	}
+	block -= 256;
+	if (block<256*256) {
+		bh = inode_getblk(inode,10,create);
+		bh = block_getblk(inode,bh,block>>8,create);
+		return block_getblk(inode,bh,block & 255,create);
+	}
+	block -= 256*256;
+	bh = inode_getblk(inode,11,create);
+	bh = block_getblk(inode,bh,block>>16,create);
+	bh = block_getblk(inode,bh,(block>>8) & 255,create);
+	return block_getblk(inode,bh,block & 255,create);
+}
+
+struct buffer_head * ext_bread(struct inode * inode, int block, int create)
+{
+	struct buffer_head * bh;
+
+	bh = ext_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 ext_read_inode(struct inode * inode)
+{
+	struct buffer_head * bh;
+	struct ext_inode * raw_inode;
+	int block;
+
+	block = 2 + (inode->i_ino-1)/EXT_INODES_PER_BLOCK;
+	if (!(bh=bread(inode->i_dev, block, BLOCK_SIZE)))
+		panic("unable to read i-node block");
+	raw_inode = ((struct ext_inode *) bh->b_data) +
+		(inode->i_ino-1)%EXT_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 < 12; block++)
+		inode->u.ext_i.i_data[block] = raw_inode->i_zone[block];
+	brelse(bh);
+	inode->i_op = NULL;
+	if (S_ISREG(inode->i_mode))
+		inode->i_op = &ext_file_inode_operations;
+	else if (S_ISDIR(inode->i_mode))
+		inode->i_op = &ext_dir_inode_operations;
+	else if (S_ISLNK(inode->i_mode))
+		inode->i_op = &ext_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 * ext_update_inode(struct inode * inode)
+{
+	struct buffer_head * bh;
+	struct ext_inode * raw_inode;
+	int block;
+
+	block = 2 + (inode->i_ino-1)/EXT_INODES_PER_BLOCK;
+	if (!(bh=bread(inode->i_dev, block, BLOCK_SIZE)))
+		panic("unable to read i-node block");
+	raw_inode = ((struct ext_inode *)bh->b_data) +
+		(inode->i_ino-1)%EXT_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 < 12; block++)
+		raw_inode->i_zone[block] = inode->u.ext_i.i_data[block];
+	mark_buffer_dirty(bh, 1);
+	inode->i_dirt=0;
+	return bh;
+}
+
+void ext_write_inode(struct inode * inode)
+{
+	struct buffer_head *bh;
+	bh = ext_update_inode (inode);
+	brelse(bh);
+}
+
+int ext_sync_inode (struct inode *inode)
+{
+	int err = 0;
+	struct buffer_head *bh;
+
+	bh = ext_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 ext inode [%04x:%08lx]\n",
+				inode->i_dev, inode->i_ino);
+			err = -1;
+		}
+	}
+	else if (!bh)
+		err = -1;
+	brelse (bh);
+	return err;
+}
+