1 files changed, 420 insertions, 0 deletions

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)