Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

5 files changed, 1011 insertions, 0 deletions

diff --git a/fs/bfs/Makefile b/fs/bfs/Makefile
new file mode 100644
index 0000000..c787b36
--- /dev/null
+++ b/fs/bfs/Makefile
@@ -0,0 +1,7 @@
+#
+# Makefile for BFS filesystem.
+#
+
+obj-$(CONFIG_BFS_FS) += bfs.o
+
+bfs-objs := inode.o file.o dir.o
diff --git a/fs/bfs/bfs.h b/fs/bfs/bfs.h
new file mode 100644
index 0000000..1020dbc
--- /dev/null
+++ b/fs/bfs/bfs.h
@@ -0,0 +1,60 @@
+/*
+ *	fs/bfs/bfs.h
+ *	Copyright (C) 1999 Tigran Aivazian <tigran@veritas.com>
+ */
+#ifndef _FS_BFS_BFS_H
+#define _FS_BFS_BFS_H
+
+#include <linux/bfs_fs.h>
+
+/*
+ * BFS file system in-core superblock info
+ */
+struct bfs_sb_info {
+	unsigned long si_blocks;
+	unsigned long si_freeb;
+	unsigned long si_freei;
+	unsigned long si_lf_ioff;
+	unsigned long si_lf_sblk;
+	unsigned long si_lf_eblk;
+	unsigned long si_lasti;
+	unsigned long * si_imap;
+	struct buffer_head * si_sbh;		/* buffer header w/superblock */
+	struct bfs_super_block * si_bfs_sb;	/* superblock in si_sbh->b_data */
+};
+
+/*
+ * BFS file system in-core inode info
+ */
+struct bfs_inode_info {
+	unsigned long i_dsk_ino; /* inode number from the disk, can be 0 */
+	unsigned long i_sblock;
+	unsigned long i_eblock;
+	struct inode vfs_inode;
+};
+
+static inline struct bfs_sb_info *BFS_SB(struct super_block *sb)
+{
+	return sb->s_fs_info;
+}
+
+static inline struct bfs_inode_info *BFS_I(struct inode *inode)
+{
+	return list_entry(inode, struct bfs_inode_info, vfs_inode);
+}
+
+
+#define printf(format, args...) \
+	printk(KERN_ERR "BFS-fs: %s(): " format, __FUNCTION__, ## args)
+
+
+/* file.c */
+extern struct inode_operations bfs_file_inops;
+extern struct file_operations bfs_file_operations;
+extern struct address_space_operations bfs_aops;
+
+/* dir.c */
+extern struct inode_operations bfs_dir_inops;
+extern struct file_operations bfs_dir_operations;
+
+#endif /* _FS_BFS_BFS_H */
diff --git a/fs/bfs/dir.c b/fs/bfs/dir.c
new file mode 100644
index 0000000..5a1e5ce
--- /dev/null
+++ b/fs/bfs/dir.c
@@ -0,0 +1,362 @@
+/*
+ *	fs/bfs/dir.c
+ *	BFS directory operations.
+ *	Copyright (C) 1999,2000  Tigran Aivazian <tigran@veritas.com>
+ */
+
+#include <linux/time.h>
+#include <linux/string.h>
+#include <linux/fs.h>
+#include <linux/smp_lock.h>
+#include <linux/buffer_head.h>
+#include <linux/sched.h>
+#include "bfs.h"
+
+#undef DEBUG
+
+#ifdef DEBUG
+#define dprintf(x...)	printf(x)
+#else
+#define dprintf(x...)
+#endif
+
+static int bfs_add_entry(struct inode * dir, const char * name, int namelen, int ino);
+static struct buffer_head * bfs_find_entry(struct inode * dir, 
+	const char * name, int namelen, struct bfs_dirent ** res_dir);
+
+static int bfs_readdir(struct file * f, void * dirent, filldir_t filldir)
+{
+	struct inode * dir = f->f_dentry->d_inode;
+	struct buffer_head * bh;
+	struct bfs_dirent * de;
+	unsigned int offset;
+	int block;
+
+	lock_kernel();
+
+	if (f->f_pos & (BFS_DIRENT_SIZE-1)) {
+		printf("Bad f_pos=%08lx for %s:%08lx\n", (unsigned long)f->f_pos, 
+			dir->i_sb->s_id, dir->i_ino);
+		unlock_kernel();
+		return -EBADF;
+	}
+
+	while (f->f_pos < dir->i_size) {
+		offset = f->f_pos & (BFS_BSIZE-1);
+		block = BFS_I(dir)->i_sblock + (f->f_pos >> BFS_BSIZE_BITS);
+		bh = sb_bread(dir->i_sb, block);
+		if (!bh) {
+			f->f_pos += BFS_BSIZE - offset;
+			continue;
+		}
+		do {
+			de = (struct bfs_dirent *)(bh->b_data + offset);
+			if (de->ino) {
+				int size = strnlen(de->name, BFS_NAMELEN);
+				if (filldir(dirent, de->name, size, f->f_pos, de->ino, DT_UNKNOWN) < 0) {
+					brelse(bh);
+					unlock_kernel();
+					return 0;
+				}
+			}
+			offset += BFS_DIRENT_SIZE;
+			f->f_pos += BFS_DIRENT_SIZE;
+		} while (offset < BFS_BSIZE && f->f_pos < dir->i_size);
+		brelse(bh);
+	}
+
+	unlock_kernel();
+	return 0;	
+}
+
+struct file_operations bfs_dir_operations = {
+	.read		= generic_read_dir,
+	.readdir	= bfs_readdir,
+	.fsync		= file_fsync,
+};
+
+extern void dump_imap(const char *, struct super_block *);
+
+static int bfs_create(struct inode * dir, struct dentry * dentry, int mode,
+		struct nameidata *nd)
+{
+	int err;
+	struct inode * inode;
+	struct super_block * s = dir->i_sb;
+	struct bfs_sb_info * info = BFS_SB(s);
+	unsigned long ino;
+
+	inode = new_inode(s);
+	if (!inode)
+		return -ENOSPC;
+	lock_kernel();
+	ino = find_first_zero_bit(info->si_imap, info->si_lasti);
+	if (ino > info->si_lasti) {
+		unlock_kernel();
+		iput(inode);
+		return -ENOSPC;
+	}
+	set_bit(ino, info->si_imap);	
+	info->si_freei--;
+	inode->i_uid = current->fsuid;
+	inode->i_gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
+	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
+	inode->i_blocks = inode->i_blksize = 0;
+	inode->i_op = &bfs_file_inops;
+	inode->i_fop = &bfs_file_operations;
+	inode->i_mapping->a_ops = &bfs_aops;
+	inode->i_mode = mode;
+	inode->i_ino = ino;
+	BFS_I(inode)->i_dsk_ino = ino;
+	BFS_I(inode)->i_sblock = 0;
+	BFS_I(inode)->i_eblock = 0;
+	insert_inode_hash(inode);
+        mark_inode_dirty(inode);
+	dump_imap("create",s);
+
+	err = bfs_add_entry(dir, dentry->d_name.name, dentry->d_name.len, inode->i_ino);
+	if (err) {
+		inode->i_nlink--;
+		mark_inode_dirty(inode);
+		iput(inode);
+		unlock_kernel();
+		return err;
+	}
+	unlock_kernel();
+	d_instantiate(dentry, inode);
+	return 0;
+}
+
+static struct dentry * bfs_lookup(struct inode * dir, struct dentry * dentry, struct nameidata *nd)
+{
+	struct inode * inode = NULL;
+	struct buffer_head * bh;
+	struct bfs_dirent * de;
+
+	if (dentry->d_name.len > BFS_NAMELEN)
+		return ERR_PTR(-ENAMETOOLONG);
+
+	lock_kernel();
+	bh = bfs_find_entry(dir, dentry->d_name.name, dentry->d_name.len, &de);
+	if (bh) {
+		unsigned long ino = le32_to_cpu(de->ino);
+		brelse(bh);
+		inode = iget(dir->i_sb, ino);
+		if (!inode) {
+			unlock_kernel();
+			return ERR_PTR(-EACCES);
+		}
+	}
+	unlock_kernel();
+	d_add(dentry, inode);
+	return NULL;
+}
+
+static int bfs_link(struct dentry * old, struct inode * dir, struct dentry * new)
+{
+	struct inode * inode = old->d_inode;
+	int err;
+
+	lock_kernel();
+	err = bfs_add_entry(dir, new->d_name.name, new->d_name.len, inode->i_ino);
+	if (err) {
+		unlock_kernel();
+		return err;
+	}
+	inode->i_nlink++;
+	inode->i_ctime = CURRENT_TIME_SEC;
+	mark_inode_dirty(inode);
+	atomic_inc(&inode->i_count);
+	d_instantiate(new, inode);
+	unlock_kernel();
+	return 0;
+}
+
+
+static int bfs_unlink(struct inode * dir, struct dentry * dentry)
+{
+	int error = -ENOENT;
+	struct inode * inode;
+	struct buffer_head * bh;
+	struct bfs_dirent * de;
+
+	inode = dentry->d_inode;
+	lock_kernel();
+	bh = bfs_find_entry(dir, dentry->d_name.name, dentry->d_name.len, &de);
+	if (!bh || de->ino != inode->i_ino) 
+		goto out_brelse;
+
+	if (!inode->i_nlink) {
+		printf("unlinking non-existent file %s:%lu (nlink=%d)\n", inode->i_sb->s_id, 
+				inode->i_ino, inode->i_nlink);
+		inode->i_nlink = 1;
+	}
+	de->ino = 0;
+	mark_buffer_dirty(bh);
+	dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC;
+	mark_inode_dirty(dir);
+	inode->i_nlink--;
+	inode->i_ctime = dir->i_ctime;
+	mark_inode_dirty(inode);
+	error = 0;
+
+out_brelse:
+	brelse(bh);
+	unlock_kernel();
+	return error;
+}
+
+static int bfs_rename(struct inode * old_dir, struct dentry * old_dentry, 
+			struct inode * new_dir, struct dentry * new_dentry)
+{
+	struct inode * old_inode, * new_inode;
+	struct buffer_head * old_bh, * new_bh;
+	struct bfs_dirent * old_de, * new_de;		
+	int error = -ENOENT;
+
+	old_bh = new_bh = NULL;
+	old_inode = old_dentry->d_inode;
+	if (S_ISDIR(old_inode->i_mode))
+		return -EINVAL;
+
+	lock_kernel();
+	old_bh = bfs_find_entry(old_dir, 
+				old_dentry->d_name.name, 
+				old_dentry->d_name.len, &old_de);
+
+	if (!old_bh || old_de->ino != old_inode->i_ino)
+		goto end_rename;
+
+	error = -EPERM;
+	new_inode = new_dentry->d_inode;
+	new_bh = bfs_find_entry(new_dir, 
+				new_dentry->d_name.name, 
+				new_dentry->d_name.len, &new_de);
+
+	if (new_bh && !new_inode) {
+		brelse(new_bh);
+		new_bh = NULL;
+	}
+	if (!new_bh) {
+		error = bfs_add_entry(new_dir, 
+					new_dentry->d_name.name,
+			 		new_dentry->d_name.len, old_inode->i_ino);
+		if (error)
+			goto end_rename;
+	}
+	old_de->ino = 0;
+	old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME_SEC;
+	mark_inode_dirty(old_dir);
+	if (new_inode) {
+		new_inode->i_nlink--;
+		new_inode->i_ctime = CURRENT_TIME_SEC;
+		mark_inode_dirty(new_inode);
+	}
+	mark_buffer_dirty(old_bh);
+	error = 0;
+
+end_rename:
+	unlock_kernel();
+	brelse(old_bh);
+	brelse(new_bh);
+	return error;
+}
+
+struct inode_operations bfs_dir_inops = {
+	.create			= bfs_create,
+	.lookup			= bfs_lookup,
+	.link			= bfs_link,
+	.unlink			= bfs_unlink,
+	.rename			= bfs_rename,
+};
+
+static int bfs_add_entry(struct inode * dir, const char * name, int namelen, int ino)
+{
+	struct buffer_head * bh;
+	struct bfs_dirent * de;
+	int block, sblock, eblock, off, eoff;
+	int i;
+
+	dprintf("name=%s, namelen=%d\n", name, namelen);
+
+	if (!namelen)
+		return -ENOENT;
+	if (namelen > BFS_NAMELEN)
+		return -ENAMETOOLONG;
+
+	sblock = BFS_I(dir)->i_sblock;
+	eblock = BFS_I(dir)->i_eblock;
+	eoff = dir->i_size % BFS_BSIZE;
+	for (block=sblock; block<=eblock; block++) {
+		bh = sb_bread(dir->i_sb, block);
+		if(!bh) 
+			return -ENOSPC;
+		for (off=0; off<BFS_BSIZE; off+=BFS_DIRENT_SIZE) {
+			de = (struct bfs_dirent *)(bh->b_data + off);
+			if (block==eblock && off>=eoff) {
+				/* Do not read/interpret the garbage in the end of eblock. */
+				de->ino = 0;
+			}
+			if (!de->ino) {
+				if ((block-sblock)*BFS_BSIZE + off >= dir->i_size) {
+					dir->i_size += BFS_DIRENT_SIZE;
+					dir->i_ctime = CURRENT_TIME_SEC;
+				}
+				dir->i_mtime = CURRENT_TIME_SEC;
+				mark_inode_dirty(dir);
+				de->ino = ino;
+				for (i=0; i<BFS_NAMELEN; i++)
+					de->name[i] = (i < namelen) ? name[i] : 0;
+				mark_buffer_dirty(bh);
+				brelse(bh);
+				return 0;
+			}
+		}
+		brelse(bh);
+	}
+	return -ENOSPC;
+}
+
+static inline int bfs_namecmp(int len, const char * name, const char * buffer)
+{
+	if (len < BFS_NAMELEN && buffer[len])
+		return 0;
+	return !memcmp(name, buffer, len);
+}
+
+static struct buffer_head * bfs_find_entry(struct inode * dir, 
+	const char * name, int namelen, struct bfs_dirent ** res_dir)
+{
+	unsigned long block, offset;
+	struct buffer_head * bh;
+	struct bfs_dirent * de;
+
+	*res_dir = NULL;
+	if (namelen > BFS_NAMELEN)
+		return NULL;
+	bh = NULL;
+	block = offset = 0;
+	while (block * BFS_BSIZE + offset < dir->i_size) {
+		if (!bh) {
+			bh = sb_bread(dir->i_sb, BFS_I(dir)->i_sblock + block);
+			if (!bh) {
+				block++;
+				continue;
+			}
+		}
+		de = (struct bfs_dirent *)(bh->b_data + offset);
+		offset += BFS_DIRENT_SIZE;
+		if (de->ino && bfs_namecmp(namelen, name, de->name)) {
+			*res_dir = de;
+			return bh;
+		}
+		if (offset < bh->b_size)
+			continue;
+		brelse(bh);
+		bh = NULL;
+		offset = 0;
+		block++;
+	}
+	brelse(bh);
+	return NULL;
+}
diff --git a/fs/bfs/file.c b/fs/bfs/file.c
new file mode 100644
index 0000000..747fd1e
--- /dev/null
+++ b/fs/bfs/file.c
@@ -0,0 +1,162 @@
+/*
+ *	fs/bfs/file.c
+ *	BFS file operations.
+ *	Copyright (C) 1999,2000 Tigran Aivazian <tigran@veritas.com>
+ */
+
+#include <linux/fs.h>
+#include <linux/buffer_head.h>
+#include <linux/smp_lock.h>
+#include "bfs.h"
+
+#undef DEBUG
+
+#ifdef DEBUG
+#define dprintf(x...)	printf(x)
+#else
+#define dprintf(x...)
+#endif
+
+struct file_operations bfs_file_operations = {
+	.llseek 	= generic_file_llseek,
+	.read		= generic_file_read,
+	.write		= generic_file_write,
+	.mmap		= generic_file_mmap,
+	.sendfile	= generic_file_sendfile,
+};
+
+static int bfs_move_block(unsigned long from, unsigned long to, struct super_block *sb)
+{
+	struct buffer_head *bh, *new;
+
+	bh = sb_bread(sb, from);
+	if (!bh)
+		return -EIO;
+	new = sb_getblk(sb, to);
+	memcpy(new->b_data, bh->b_data, bh->b_size);
+	mark_buffer_dirty(new);
+	bforget(bh);
+	brelse(new);
+	return 0;
+}
+
+static int bfs_move_blocks(struct super_block *sb, unsigned long start, unsigned long end, 
+				unsigned long where)
+{
+	unsigned long i;
+
+	dprintf("%08lx-%08lx->%08lx\n", start, end, where);
+	for (i = start; i <= end; i++)
+		if(bfs_move_block(i, where + i, sb)) {
+			dprintf("failed to move block %08lx -> %08lx\n", i, where + i);
+			return -EIO;
+		}
+	return 0;
+}
+
+static int bfs_get_block(struct inode * inode, sector_t block, 
+	struct buffer_head * bh_result, int create)
+{
+	long phys;
+	int err;
+	struct super_block *sb = inode->i_sb;
+	struct bfs_sb_info *info = BFS_SB(sb);
+	struct bfs_inode_info *bi = BFS_I(inode);
+	struct buffer_head *sbh = info->si_sbh;
+
+	if (block < 0 || block > info->si_blocks)
+		return -EIO;
+
+	phys = bi->i_sblock + block;
+	if (!create) {
+		if (phys <= bi->i_eblock) {
+			dprintf("c=%d, b=%08lx, phys=%08lx (granted)\n", create, block, phys);
+			map_bh(bh_result, sb, phys);
+		}
+		return 0;
+	}
+
+	/* if the file is not empty and the requested block is within the range
+	   of blocks allocated for this file, we can grant it */
+	if (inode->i_size && phys <= bi->i_eblock) {
+		dprintf("c=%d, b=%08lx, phys=%08lx (interim block granted)\n", 
+				create, block, phys);
+		map_bh(bh_result, sb, phys);
+		return 0;
+	}
+
+	/* the rest has to be protected against itself */
+	lock_kernel();
+
+	/* if the last data block for this file is the last allocated block, we can
+	   extend the file trivially, without moving it anywhere */
+	if (bi->i_eblock == info->si_lf_eblk) {
+		dprintf("c=%d, b=%08lx, phys=%08lx (simple extension)\n", 
+				create, block, phys);
+		map_bh(bh_result, sb, phys);
+		info->si_freeb -= phys - bi->i_eblock;
+		info->si_lf_eblk = bi->i_eblock = phys;
+		mark_inode_dirty(inode);
+		mark_buffer_dirty(sbh);
+		err = 0;
+		goto out;
+	}
+
+	/* Ok, we have to move this entire file to the next free block */
+	phys = info->si_lf_eblk + 1;
+	if (bi->i_sblock) { /* if data starts on block 0 then there is no data */
+		err = bfs_move_blocks(inode->i_sb, bi->i_sblock, 
+				bi->i_eblock, phys);
+		if (err) {
+			dprintf("failed to move ino=%08lx -> fs corruption\n", inode->i_ino);
+			goto out;
+		}
+	} else
+		err = 0;
+
+	dprintf("c=%d, b=%08lx, phys=%08lx (moved)\n", create, block, phys);
+	bi->i_sblock = phys;
+	phys += block;
+	info->si_lf_eblk = bi->i_eblock = phys;
+
+	/* this assumes nothing can write the inode back while we are here
+	 * and thus update inode->i_blocks! (XXX)*/
+	info->si_freeb -= bi->i_eblock - bi->i_sblock + 1 - inode->i_blocks;
+	mark_inode_dirty(inode);
+	mark_buffer_dirty(sbh);
+	map_bh(bh_result, sb, phys);
+out:
+	unlock_kernel();
+	return err;
+}
+
+static int bfs_writepage(struct page *page, struct writeback_control *wbc)
+{
+	return block_write_full_page(page, bfs_get_block, wbc);
+}
+
+static int bfs_readpage(struct file *file, struct page *page)
+{
+	return block_read_full_page(page, bfs_get_block);
+}
+
+static int bfs_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
+{
+	return block_prepare_write(page, from, to, bfs_get_block);
+}
+
+static sector_t bfs_bmap(struct address_space *mapping, sector_t block)
+{
+	return generic_block_bmap(mapping, block, bfs_get_block);
+}
+
+struct address_space_operations bfs_aops = {
+	.readpage	= bfs_readpage,
+	.writepage	= bfs_writepage,
+	.sync_page	= block_sync_page,
+	.prepare_write	= bfs_prepare_write,
+	.commit_write	= generic_commit_write,
+	.bmap		= bfs_bmap,
+};
+
+struct inode_operations bfs_file_inops;
diff --git a/fs/bfs/inode.c b/fs/bfs/inode.c
new file mode 100644
index 0000000..64e0fb3
--- /dev/null
+++ b/fs/bfs/inode.c
@@ -0,0 +1,420 @@
+/*
+ *	fs/bfs/inode.c
+ *	BFS superblock and inode operations.
+ *	Copyright (C) 1999,2000 Tigran Aivazian <tigran@veritas.com>
+ *	From fs/minix, Copyright (C) 1991, 1992 Linus Torvalds.
+ */
+
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/smp_lock.h>
+#include <linux/buffer_head.h>
+#include <linux/vfs.h>
+#include <asm/uaccess.h>
+#include "bfs.h"
+
+MODULE_AUTHOR("Tigran A. Aivazian <tigran@veritas.com>");
+MODULE_DESCRIPTION("SCO UnixWare BFS filesystem for Linux");
+MODULE_LICENSE("GPL");
+
+#undef DEBUG
+
+#ifdef DEBUG
+#define dprintf(x...)	printf(x)
+#else
+#define dprintf(x...)
+#endif
+
+void dump_imap(const char *prefix, struct super_block * s);
+
+static void bfs_read_inode(struct inode * inode)
+{
+	unsigned long ino = inode->i_ino;
+	struct bfs_inode * di;
+	struct buffer_head * bh;
+	int block, off;
+
+	if (ino < BFS_ROOT_INO || ino > BFS_SB(inode->i_sb)->si_lasti) {
+		printf("Bad inode number %s:%08lx\n", inode->i_sb->s_id, ino);
+		make_bad_inode(inode);
+		return;
+	}
+
+	block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1;
+	bh = sb_bread(inode->i_sb, block);
+	if (!bh) {
+		printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id, ino);
+		make_bad_inode(inode);
+		return;
+	}
+
+	off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
+	di = (struct bfs_inode *)bh->b_data + off;
+
+	inode->i_mode = 0x0000FFFF & di->i_mode;
+	if (di->i_vtype == BFS_VDIR) {
+		inode->i_mode |= S_IFDIR;
+		inode->i_op = &bfs_dir_inops;
+		inode->i_fop = &bfs_dir_operations;
+	} else if (di->i_vtype == BFS_VREG) {
+		inode->i_mode |= S_IFREG;
+		inode->i_op = &bfs_file_inops;
+		inode->i_fop = &bfs_file_operations;
+		inode->i_mapping->a_ops = &bfs_aops;
+	}
+
+	inode->i_uid = di->i_uid;
+	inode->i_gid = di->i_gid;
+	inode->i_nlink = di->i_nlink;
+	inode->i_size = BFS_FILESIZE(di);
+	inode->i_blocks = BFS_FILEBLOCKS(di);
+	inode->i_blksize = PAGE_SIZE;
+	inode->i_atime.tv_sec = di->i_atime;
+	inode->i_mtime.tv_sec = di->i_mtime;
+	inode->i_ctime.tv_sec = di->i_ctime;
+	inode->i_atime.tv_nsec = 0;
+	inode->i_mtime.tv_nsec = 0;
+	inode->i_ctime.tv_nsec = 0;
+	BFS_I(inode)->i_dsk_ino = di->i_ino; /* can be 0 so we store a copy */
+	BFS_I(inode)->i_sblock = di->i_sblock;
+	BFS_I(inode)->i_eblock = di->i_eblock;
+
+	brelse(bh);
+}
+
+static int bfs_write_inode(struct inode * inode, int unused)
+{
+	unsigned long ino = inode->i_ino;
+	struct bfs_inode * di;
+	struct buffer_head * bh;
+	int block, off;
+
+	if (ino < BFS_ROOT_INO || ino > BFS_SB(inode->i_sb)->si_lasti) {
+		printf("Bad inode number %s:%08lx\n", inode->i_sb->s_id, ino);
+		return -EIO;
+	}
+
+	lock_kernel();
+	block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1;
+	bh = sb_bread(inode->i_sb, block);
+	if (!bh) {
+		printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id, ino);
+		unlock_kernel();
+		return -EIO;
+	}
+
+	off = (ino - BFS_ROOT_INO)%BFS_INODES_PER_BLOCK;
+	di = (struct bfs_inode *)bh->b_data + off;
+
+	if (inode->i_ino == BFS_ROOT_INO)
+		di->i_vtype = BFS_VDIR;
+	else
+		di->i_vtype = BFS_VREG;
+
+	di->i_ino = inode->i_ino;
+	di->i_mode = inode->i_mode;
+	di->i_uid = inode->i_uid;
+	di->i_gid = inode->i_gid;
+	di->i_nlink = inode->i_nlink;
+	di->i_atime = inode->i_atime.tv_sec;
+	di->i_mtime = inode->i_mtime.tv_sec;
+	di->i_ctime = inode->i_ctime.tv_sec;
+	di->i_sblock = BFS_I(inode)->i_sblock;
+	di->i_eblock = BFS_I(inode)->i_eblock;
+	di->i_eoffset = di->i_sblock * BFS_BSIZE + inode->i_size - 1;
+
+	mark_buffer_dirty(bh);
+	brelse(bh);
+	unlock_kernel();
+	return 0;
+}
+
+static void bfs_delete_inode(struct inode * inode)
+{
+	unsigned long ino = inode->i_ino;
+	struct bfs_inode * di;
+	struct buffer_head * bh;
+	int block, off;
+	struct super_block * s = inode->i_sb;
+	struct bfs_sb_info * info = BFS_SB(s);
+
+	dprintf("ino=%08lx\n", inode->i_ino);
+
+	if (inode->i_ino < BFS_ROOT_INO || inode->i_ino > info->si_lasti) {
+		printf("invalid ino=%08lx\n", inode->i_ino);
+		return;
+	}
+	
+	inode->i_size = 0;
+	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
+	lock_kernel();
+	mark_inode_dirty(inode);
+	block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1;
+	bh = sb_bread(s, block);
+	if (!bh) {
+		printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id, ino);
+		unlock_kernel();
+		return;
+	}
+	off = (ino - BFS_ROOT_INO)%BFS_INODES_PER_BLOCK;
+	di = (struct bfs_inode *)bh->b_data + off;
+	if (di->i_ino) {
+		info->si_freeb += BFS_FILEBLOCKS(di);
+		info->si_freei++;
+		clear_bit(di->i_ino, info->si_imap);
+		dump_imap("delete_inode", s);
+	}
+	di->i_ino = 0;
+	di->i_sblock = 0;
+	mark_buffer_dirty(bh);
+	brelse(bh);
+
+	/* if this was the last file, make the previous 
+	   block "last files last block" even if there is no real file there,
+	   saves us 1 gap */
+	if (info->si_lf_eblk == BFS_I(inode)->i_eblock) {
+		info->si_lf_eblk = BFS_I(inode)->i_sblock - 1;
+		mark_buffer_dirty(info->si_sbh);
+	}
+	unlock_kernel();
+	clear_inode(inode);
+}
+
+static void bfs_put_super(struct super_block *s)
+{
+	struct bfs_sb_info *info = BFS_SB(s);
+	brelse(info->si_sbh);
+	kfree(info->si_imap);
+	kfree(info);
+	s->s_fs_info = NULL;
+}
+
+static int bfs_statfs(struct super_block *s, struct kstatfs *buf)
+{
+	struct bfs_sb_info *info = BFS_SB(s);
+	u64 id = huge_encode_dev(s->s_bdev->bd_dev);
+	buf->f_type = BFS_MAGIC;
+	buf->f_bsize = s->s_blocksize;
+	buf->f_blocks = info->si_blocks;
+	buf->f_bfree = buf->f_bavail = info->si_freeb;
+	buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO;
+	buf->f_ffree = info->si_freei;
+	buf->f_fsid.val[0] = (u32)id;
+	buf->f_fsid.val[1] = (u32)(id >> 32);
+	buf->f_namelen = BFS_NAMELEN;
+	return 0;
+}
+
+static void bfs_write_super(struct super_block *s)
+{
+	lock_kernel();
+	if (!(s->s_flags & MS_RDONLY))
+		mark_buffer_dirty(BFS_SB(s)->si_sbh);
+	s->s_dirt = 0;
+	unlock_kernel();
+}
+
+static kmem_cache_t * bfs_inode_cachep;
+
+static struct inode *bfs_alloc_inode(struct super_block *sb)
+{
+	struct bfs_inode_info *bi;
+	bi = kmem_cache_alloc(bfs_inode_cachep, SLAB_KERNEL);
+	if (!bi)
+		return NULL;
+	return &bi->vfs_inode;
+}
+
+static void bfs_destroy_inode(struct inode *inode)
+{
+	kmem_cache_free(bfs_inode_cachep, BFS_I(inode));
+}
+
+static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
+{
+	struct bfs_inode_info *bi = foo;
+
+	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
+	    SLAB_CTOR_CONSTRUCTOR)
+		inode_init_once(&bi->vfs_inode);
+}
+ 
+static int init_inodecache(void)
+{
+	bfs_inode_cachep = kmem_cache_create("bfs_inode_cache",
+					     sizeof(struct bfs_inode_info),
+					     0, SLAB_RECLAIM_ACCOUNT,
+					     init_once, NULL);
+	if (bfs_inode_cachep == NULL)
+		return -ENOMEM;
+	return 0;
+}
+
+static void destroy_inodecache(void)
+{
+	if (kmem_cache_destroy(bfs_inode_cachep))
+		printk(KERN_INFO "bfs_inode_cache: not all structures were freed\n");
+}
+
+static struct super_operations bfs_sops = {
+	.alloc_inode	= bfs_alloc_inode,
+	.destroy_inode	= bfs_destroy_inode,
+	.read_inode	= bfs_read_inode,
+	.write_inode	= bfs_write_inode,
+	.delete_inode	= bfs_delete_inode,
+	.put_super	= bfs_put_super,
+	.write_super	= bfs_write_super,
+	.statfs		= bfs_statfs,
+};
+
+void dump_imap(const char *prefix, struct super_block * s)
+{
+#if 0
+	int i;
+	char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL);
+
+	if (!tmpbuf)
+		return;
+	for (i=BFS_SB(s)->si_lasti; i>=0; i--) {
+		if (i>PAGE_SIZE-100) break;
+		if (test_bit(i, BFS_SB(s)->si_imap))
+			strcat(tmpbuf, "1");
+		else
+			strcat(tmpbuf, "0");
+	}
+	printk(KERN_ERR "BFS-fs: %s: lasti=%08lx <%s>\n", prefix, BFS_SB(s)->si_lasti, tmpbuf);
+	free_page((unsigned long)tmpbuf);
+#endif
+}
+
+static int bfs_fill_super(struct super_block *s, void *data, int silent)
+{
+	struct buffer_head * bh;
+	struct bfs_super_block * bfs_sb;
+	struct inode * inode;
+	int i, imap_len;
+	struct bfs_sb_info * info;
+
+	info = kmalloc(sizeof(*info), GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
+	s->s_fs_info = info;
+	memset(info, 0, sizeof(*info));
+
+	sb_set_blocksize(s, BFS_BSIZE);
+
+	bh = sb_bread(s, 0);
+	if(!bh)
+		goto out;
+	bfs_sb = (struct bfs_super_block *)bh->b_data;
+	if (bfs_sb->s_magic != BFS_MAGIC) {
+		if (!silent)
+			printf("No BFS filesystem on %s (magic=%08x)\n", 
+				s->s_id, bfs_sb->s_magic);
+		goto out;
+	}
+	if (BFS_UNCLEAN(bfs_sb, s) && !silent)
+		printf("%s is unclean, continuing\n", s->s_id);
+
+	s->s_magic = BFS_MAGIC;
+	info->si_bfs_sb = bfs_sb;
+	info->si_sbh = bh;
+	info->si_lasti = (bfs_sb->s_start - BFS_BSIZE)/sizeof(struct bfs_inode) 
+			+ BFS_ROOT_INO - 1;
+
+	imap_len = info->si_lasti/8 + 1;
+	info->si_imap = kmalloc(imap_len, GFP_KERNEL);
+	if (!info->si_imap)
+		goto out;
+	memset(info->si_imap, 0, imap_len);
+	for (i=0; i<BFS_ROOT_INO; i++) 
+		set_bit(i, info->si_imap);
+
+	s->s_op = &bfs_sops;
+	inode = iget(s, BFS_ROOT_INO);
+	if (!inode) {
+		kfree(info->si_imap);
+		goto out;
+	}
+	s->s_root = d_alloc_root(inode);
+	if (!s->s_root) {
+		iput(inode);
+		kfree(info->si_imap);
+		goto out;
+	}
+
+	info->si_blocks = (bfs_sb->s_end + 1)>>BFS_BSIZE_BITS; /* for statfs(2) */
+	info->si_freeb = (bfs_sb->s_end + 1 - bfs_sb->s_start)>>BFS_BSIZE_BITS;
+	info->si_freei = 0;
+	info->si_lf_eblk = 0;
+	info->si_lf_sblk = 0;
+	info->si_lf_ioff = 0;
+	for (i=BFS_ROOT_INO; i<=info->si_lasti; i++) {
+		inode = iget(s,i);
+		if (BFS_I(inode)->i_dsk_ino == 0)
+			info->si_freei++;
+		else {
+			set_bit(i, info->si_imap);
+			info->si_freeb -= inode->i_blocks;
+			if (BFS_I(inode)->i_eblock > info->si_lf_eblk) {
+				info->si_lf_eblk = BFS_I(inode)->i_eblock;
+				info->si_lf_sblk = BFS_I(inode)->i_sblock;
+				info->si_lf_ioff = BFS_INO2OFF(i);
+			}
+		}
+		iput(inode);
+	}
+	if (!(s->s_flags & MS_RDONLY)) {
+		mark_buffer_dirty(bh);
+		s->s_dirt = 1;
+	} 
+	dump_imap("read_super", s);
+	return 0;
+
+out:
+	brelse(bh);
+	kfree(info);
+	s->s_fs_info = NULL;
+	return -EINVAL;
+}
+
+static struct super_block *bfs_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data)
+{
+	return get_sb_bdev(fs_type, flags, dev_name, data, bfs_fill_super);
+}
+
+static struct file_system_type bfs_fs_type = {
+	.owner		= THIS_MODULE,
+	.name		= "bfs",
+	.get_sb		= bfs_get_sb,
+	.kill_sb	= kill_block_super,
+	.fs_flags	= FS_REQUIRES_DEV,
+};
+
+static int __init init_bfs_fs(void)
+{
+	int err = init_inodecache();
+	if (err)
+		goto out1;
+        err = register_filesystem(&bfs_fs_type);
+	if (err)
+		goto out;
+	return 0;
+out:
+	destroy_inodecache();
+out1:
+	return err;
+}
+
+static void __exit exit_bfs_fs(void)
+{
+	unregister_filesystem(&bfs_fs_type);
+	destroy_inodecache();
+}
+
+module_init(init_bfs_fs)
+module_exit(exit_bfs_fs)