1 files changed, 489 insertions, 0 deletions

diff --git a/fs/bfs/inode.c b/fs/bfs/inode.c
new file mode 100644
index 000000000..fd691e481
--- /dev/null
+++ b/fs/bfs/inode.c
@@ -0,0 +1,489 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *	fs/bfs/inode.c
+ *	BFS superblock and inode operations.
+ *	Copyright (C) 1999-2018 Tigran Aivazian <aivazian.tigran@gmail.com>
+ *	From fs/minix, Copyright (C) 1991, 1992 Linus Torvalds.
+ *	Made endianness-clean by Andrew Stribblehill <ads@wompom.org>, 2005.
+ */
+
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/buffer_head.h>
+#include <linux/vfs.h>
+#include <linux/writeback.h>
+#include <linux/uio.h>
+#include <linux/uaccess.h>
+#include "bfs.h"
+
+MODULE_AUTHOR("Tigran Aivazian <aivazian.tigran@gmail.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
+
+struct inode *bfs_iget(struct super_block *sb, unsigned long ino)
+{
+	struct bfs_inode *di;
+	struct inode *inode;
+	struct buffer_head *bh;
+	int block, off;
+
+	inode = iget_locked(sb, ino);
+	if (!inode)
+		return ERR_PTR(-ENOMEM);
+	if (!(inode->i_state & I_NEW))
+		return inode;
+
+	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);
+		goto error;
+	}
+
+	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);
+		goto error;
+	}
+
+	off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
+	di = (struct bfs_inode *)bh->b_data + off;
+
+	inode->i_mode = 0x0000FFFF & le32_to_cpu(di->i_mode);
+	if (le32_to_cpu(di->i_vtype) == BFS_VDIR) {
+		inode->i_mode |= S_IFDIR;
+		inode->i_op = &bfs_dir_inops;
+		inode->i_fop = &bfs_dir_operations;
+	} else if (le32_to_cpu(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;
+	}
+
+	BFS_I(inode)->i_sblock =  le32_to_cpu(di->i_sblock);
+	BFS_I(inode)->i_eblock =  le32_to_cpu(di->i_eblock);
+	BFS_I(inode)->i_dsk_ino = le16_to_cpu(di->i_ino);
+	i_uid_write(inode, le32_to_cpu(di->i_uid));
+	i_gid_write(inode,  le32_to_cpu(di->i_gid));
+	set_nlink(inode, le32_to_cpu(di->i_nlink));
+	inode->i_size = BFS_FILESIZE(di);
+	inode->i_blocks = BFS_FILEBLOCKS(di);
+	inode->i_atime.tv_sec =  le32_to_cpu(di->i_atime);
+	inode->i_mtime.tv_sec =  le32_to_cpu(di->i_mtime);
+	inode->i_ctime.tv_sec =  le32_to_cpu(di->i_ctime);
+	inode->i_atime.tv_nsec = 0;
+	inode->i_mtime.tv_nsec = 0;
+	inode->i_ctime.tv_nsec = 0;
+
+	brelse(bh);
+	unlock_new_inode(inode);
+	return inode;
+
+error:
+	iget_failed(inode);
+	return ERR_PTR(-EIO);
+}
+
+static struct bfs_inode *find_inode(struct super_block *sb, u16 ino, struct buffer_head **p)
+{
+	if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(sb)->si_lasti)) {
+		printf("Bad inode number %s:%08x\n", sb->s_id, ino);
+		return ERR_PTR(-EIO);
+	}
+
+	ino -= BFS_ROOT_INO;
+
+	*p = sb_bread(sb, 1 + ino / BFS_INODES_PER_BLOCK);
+	if (!*p) {
+		printf("Unable to read inode %s:%08x\n", sb->s_id, ino);
+		return ERR_PTR(-EIO);
+	}
+
+	return (struct bfs_inode *)(*p)->b_data +  ino % BFS_INODES_PER_BLOCK;
+}
+
+static int bfs_write_inode(struct inode *inode, struct writeback_control *wbc)
+{
+	struct bfs_sb_info *info = BFS_SB(inode->i_sb);
+	unsigned int ino = (u16)inode->i_ino;
+	unsigned long i_sblock;
+	struct bfs_inode *di;
+	struct buffer_head *bh;
+	int err = 0;
+
+	dprintf("ino=%08x\n", ino);
+
+	di = find_inode(inode->i_sb, ino, &bh);
+	if (IS_ERR(di))
+		return PTR_ERR(di);
+
+	mutex_lock(&info->bfs_lock);
+
+	if (ino == BFS_ROOT_INO)
+		di->i_vtype = cpu_to_le32(BFS_VDIR);
+	else
+		di->i_vtype = cpu_to_le32(BFS_VREG);
+
+	di->i_ino = cpu_to_le16(ino);
+	di->i_mode = cpu_to_le32(inode->i_mode);
+	di->i_uid = cpu_to_le32(i_uid_read(inode));
+	di->i_gid = cpu_to_le32(i_gid_read(inode));
+	di->i_nlink = cpu_to_le32(inode->i_nlink);
+	di->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
+	di->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
+	di->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
+	i_sblock = BFS_I(inode)->i_sblock;
+	di->i_sblock = cpu_to_le32(i_sblock);
+	di->i_eblock = cpu_to_le32(BFS_I(inode)->i_eblock);
+	di->i_eoffset = cpu_to_le32(i_sblock * BFS_BSIZE + inode->i_size - 1);
+
+	mark_buffer_dirty(bh);
+	if (wbc->sync_mode == WB_SYNC_ALL) {
+		sync_dirty_buffer(bh);
+		if (buffer_req(bh) && !buffer_uptodate(bh))
+			err = -EIO;
+	}
+	brelse(bh);
+	mutex_unlock(&info->bfs_lock);
+	return err;
+}
+
+static void bfs_evict_inode(struct inode *inode)
+{
+	unsigned long ino = inode->i_ino;
+	struct bfs_inode *di;
+	struct buffer_head *bh;
+	struct super_block *s = inode->i_sb;
+	struct bfs_sb_info *info = BFS_SB(s);
+	struct bfs_inode_info *bi = BFS_I(inode);
+
+	dprintf("ino=%08lx\n", ino);
+
+	truncate_inode_pages_final(&inode->i_data);
+	invalidate_inode_buffers(inode);
+	clear_inode(inode);
+
+	if (inode->i_nlink)
+		return;
+
+	di = find_inode(s, inode->i_ino, &bh);
+	if (IS_ERR(di))
+		return;
+
+	mutex_lock(&info->bfs_lock);
+	/* clear on-disk inode */
+	memset(di, 0, sizeof(struct bfs_inode));
+	mark_buffer_dirty(bh);
+	brelse(bh);
+
+	if (bi->i_dsk_ino) {
+		if (bi->i_sblock)
+			info->si_freeb += bi->i_eblock + 1 - bi->i_sblock;
+		info->si_freei++;
+		clear_bit(ino, info->si_imap);
+		bfs_dump_imap("evict_inode", s);
+	}
+
+	/*
+	 * If this was the last file, make the previous block
+	 * "last block of the last file" even if there is no
+	 * real file there, saves us 1 gap.
+	 */
+	if (info->si_lf_eblk == bi->i_eblock)
+		info->si_lf_eblk = bi->i_sblock - 1;
+	mutex_unlock(&info->bfs_lock);
+}
+
+static void bfs_put_super(struct super_block *s)
+{
+	struct bfs_sb_info *info = BFS_SB(s);
+
+	if (!info)
+		return;
+
+	mutex_destroy(&info->bfs_lock);
+	kfree(info);
+	s->s_fs_info = NULL;
+}
+
+static int bfs_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+	struct super_block *s = dentry->d_sb;
+	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 = u64_to_fsid(id);
+	buf->f_namelen = BFS_NAMELEN;
+	return 0;
+}
+
+static struct kmem_cache *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, GFP_KERNEL);
+	if (!bi)
+		return NULL;
+	return &bi->vfs_inode;
+}
+
+static void bfs_free_inode(struct inode *inode)
+{
+	kmem_cache_free(bfs_inode_cachep, BFS_I(inode));
+}
+
+static void init_once(void *foo)
+{
+	struct bfs_inode_info *bi = foo;
+
+	inode_init_once(&bi->vfs_inode);
+}
+
+static int __init init_inodecache(void)
+{
+	bfs_inode_cachep = kmem_cache_create("bfs_inode_cache",
+					     sizeof(struct bfs_inode_info),
+					     0, (SLAB_RECLAIM_ACCOUNT|
+						SLAB_MEM_SPREAD|SLAB_ACCOUNT),
+					     init_once);
+	if (bfs_inode_cachep == NULL)
+		return -ENOMEM;
+	return 0;
+}
+
+static void destroy_inodecache(void)
+{
+	/*
+	 * Make sure all delayed rcu free inodes are flushed before we
+	 * destroy cache.
+	 */
+	rcu_barrier();
+	kmem_cache_destroy(bfs_inode_cachep);
+}
+
+static const struct super_operations bfs_sops = {
+	.alloc_inode	= bfs_alloc_inode,
+	.free_inode	= bfs_free_inode,
+	.write_inode	= bfs_write_inode,
+	.evict_inode	= bfs_evict_inode,
+	.put_super	= bfs_put_super,
+	.statfs		= bfs_statfs,
+};
+
+void bfs_dump_imap(const char *prefix, struct super_block *s)
+{
+#ifdef DEBUG
+	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");
+	}
+	printf("%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, *sbh;
+	struct bfs_super_block *bfs_sb;
+	struct inode *inode;
+	unsigned i;
+	struct bfs_sb_info *info;
+	int ret = -EINVAL;
+	unsigned long i_sblock, i_eblock, i_eoff, s_size;
+
+	info = kzalloc(sizeof(*info), GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
+	mutex_init(&info->bfs_lock);
+	s->s_fs_info = info;
+	s->s_time_min = 0;
+	s->s_time_max = U32_MAX;
+
+	sb_set_blocksize(s, BFS_BSIZE);
+
+	sbh = sb_bread(s, 0);
+	if (!sbh)
+		goto out;
+	bfs_sb = (struct bfs_super_block *)sbh->b_data;
+	if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) {
+		if (!silent)
+			printf("No BFS filesystem on %s (magic=%08x)\n", s->s_id,  le32_to_cpu(bfs_sb->s_magic));
+		goto out1;
+	}
+	if (BFS_UNCLEAN(bfs_sb, s) && !silent)
+		printf("%s is unclean, continuing\n", s->s_id);
+
+	s->s_magic = BFS_MAGIC;
+
+	if (le32_to_cpu(bfs_sb->s_start) > le32_to_cpu(bfs_sb->s_end) ||
+	    le32_to_cpu(bfs_sb->s_start) < sizeof(struct bfs_super_block) + sizeof(struct bfs_dirent)) {
+		printf("Superblock is corrupted on %s\n", s->s_id);
+		goto out1;
+	}
+
+	info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE) / sizeof(struct bfs_inode) + BFS_ROOT_INO - 1;
+	if (info->si_lasti == BFS_MAX_LASTI)
+		printf("NOTE: filesystem %s was created with 512 inodes, the real maximum is 511, mounting anyway\n", s->s_id);
+	else if (info->si_lasti > BFS_MAX_LASTI) {
+		printf("Impossible last inode number %lu > %d on %s\n", info->si_lasti, BFS_MAX_LASTI, s->s_id);
+		goto out1;
+	}
+	for (i = 0; i < BFS_ROOT_INO; i++)
+		set_bit(i, info->si_imap);
+
+	s->s_op = &bfs_sops;
+	inode = bfs_iget(s, BFS_ROOT_INO);
+	if (IS_ERR(inode)) {
+		ret = PTR_ERR(inode);
+		goto out1;
+	}
+	s->s_root = d_make_root(inode);
+	if (!s->s_root) {
+		ret = -ENOMEM;
+		goto out1;
+	}
+
+	info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS;
+	info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1 - le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS;
+	info->si_freei = 0;
+	info->si_lf_eblk = 0;
+
+	/* can we read the last block? */
+	bh = sb_bread(s, info->si_blocks - 1);
+	if (!bh) {
+		printf("Last block not available on %s: %lu\n", s->s_id, info->si_blocks - 1);
+		ret = -EIO;
+		goto out2;
+	}
+	brelse(bh);
+
+	bh = NULL;
+	for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) {
+		struct bfs_inode *di;
+		int block = (i - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
+		int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
+		unsigned long eblock;
+
+		if (!off) {
+			brelse(bh);
+			bh = sb_bread(s, block);
+		}
+
+		if (!bh)
+			continue;
+
+		di = (struct bfs_inode *)bh->b_data + off;
+
+		/* test if filesystem is not corrupted */
+
+		i_eoff = le32_to_cpu(di->i_eoffset);
+		i_sblock = le32_to_cpu(di->i_sblock);
+		i_eblock = le32_to_cpu(di->i_eblock);
+		s_size = le32_to_cpu(bfs_sb->s_end);
+
+		if (i_sblock > info->si_blocks ||
+			i_eblock > info->si_blocks ||
+			i_sblock > i_eblock ||
+			(i_eoff != le32_to_cpu(-1) && i_eoff > s_size) ||
+			i_sblock * BFS_BSIZE > i_eoff) {
+
+			printf("Inode 0x%08x corrupted on %s\n", i, s->s_id);
+
+			brelse(bh);
+			ret = -EIO;
+			goto out2;
+		}
+
+		if (!di->i_ino) {
+			info->si_freei++;
+			continue;
+		}
+		set_bit(i, info->si_imap);
+		info->si_freeb -= BFS_FILEBLOCKS(di);
+
+		eblock =  le32_to_cpu(di->i_eblock);
+		if (eblock > info->si_lf_eblk)
+			info->si_lf_eblk = eblock;
+	}
+	brelse(bh);
+	brelse(sbh);
+	bfs_dump_imap("fill_super", s);
+	return 0;
+
+out2:
+	dput(s->s_root);
+	s->s_root = NULL;
+out1:
+	brelse(sbh);
+out:
+	mutex_destroy(&info->bfs_lock);
+	kfree(info);
+	s->s_fs_info = NULL;
+	return ret;
+}
+
+static struct dentry *bfs_mount(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data)
+{
+	return mount_bdev(fs_type, flags, dev_name, data, bfs_fill_super);
+}
+
+static struct file_system_type bfs_fs_type = {
+	.owner		= THIS_MODULE,
+	.name		= "bfs",
+	.mount		= bfs_mount,
+	.kill_sb	= kill_block_super,
+	.fs_flags	= FS_REQUIRES_DEV,
+};
+MODULE_ALIAS_FS("bfs");
+
+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)