fs/bfs/inode.c - pub/scm/linux/kernel/git/joro/linux - Git at Google

 /*
  *	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/locks.h>
 #include <linux/bfs_fs.h>
 #include <linux/smp_lock.h>

 #include <asm/uaccess.h>

 #include "bfs_defs.h"

 MODULE_AUTHOR("Tigran A. Aivazian <tigran@veritas.com>");
 MODULE_DESCRIPTION("SCO UnixWare BFS filesystem for Linux");
 MODULE_LICENSE("GPL");
 EXPORT_NO_SYMBOLS;

 #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;
 	kdev_t dev = inode->i_dev;
 	struct bfs_inode * di;
 	struct buffer_head * bh;
 	int block, off;

 	if (ino < BFS_ROOT_INO || ino > inode->i_sb->su_lasti) {
 		printf("Bad inode number %s:%08lx\n", bdevname(dev), ino);
 		make_bad_inode(inode);
 		return;
 	}

 	block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1;
 	bh = bread(dev, block, BFS_BSIZE);
 	if (!bh) {
 		printf("Unable to read inode %s:%08lx\n", bdevname(dev), 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 = di->i_atime;
 	inode->i_mtime = di->i_mtime;
 	inode->i_ctime = di->i_ctime;
 	inode->iu_dsk_ino = di->i_ino; /* can be 0 so we store a copy */
 	inode->iu_sblock = di->i_sblock;
 	inode->iu_eblock = di->i_eblock;

 	brelse(bh);
 }

 static void bfs_write_inode(struct inode * inode, int unused)
 {
 	unsigned long ino = inode->i_ino;
 	kdev_t dev = inode->i_dev;
 	struct bfs_inode * di;
 	struct buffer_head * bh;
 	int block, off;

 	if (ino < BFS_ROOT_INO || ino > inode->i_sb->su_lasti) {
 		printf("Bad inode number %s:%08lx\n", bdevname(dev), ino);
 		return;
 	}

 	lock_kernel();
 	block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1;
 	bh = bread(dev, block, BFS_BSIZE);
 	if (!bh) {
 		printf("Unable to read inode %s:%08lx\n", bdevname(dev), ino);
 		unlock_kernel();
 		return;
 	}

 	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;
 	di->i_mtime = inode->i_mtime;
 	di->i_ctime = inode->i_ctime;
 	di->i_sblock = inode->iu_sblock;
 	di->i_eblock = inode->iu_eblock;
 	di->i_eoffset = di->i_sblock * BFS_BSIZE + inode->i_size - 1;

 	mark_buffer_dirty(bh);
 	brelse(bh);
 	unlock_kernel();
 }

 static void bfs_delete_inode(struct inode * inode)
 {
 	unsigned long ino = inode->i_ino;
 	kdev_t dev = inode->i_dev;
 	struct bfs_inode * di;
 	struct buffer_head * bh;
 	int block, off;
 	struct super_block * s = inode->i_sb;

 	dprintf("ino=%08lx\n", inode->i_ino);

 	if (inode->i_ino < BFS_ROOT_INO || inode->i_ino > inode->i_sb->su_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;
 	lock_kernel();
 	mark_inode_dirty(inode);
 	block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1;
 	bh = bread(dev, block, BFS_BSIZE);
 	if (!bh) {
 		printf("Unable to read inode %s:%08lx\n", bdevname(dev), 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) {
 		s->su_freeb += BFS_FILEBLOCKS(di);
 		s->su_freei++;
 		clear_bit(di->i_ino, s->su_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 (s->su_lf_eblk == inode->iu_eblock) {
 		s->su_lf_eblk = inode->iu_sblock - 1;
 		mark_buffer_dirty(s->su_sbh);
 	}
 	unlock_kernel();
 	clear_inode(inode);
 }

 static void bfs_put_super(struct super_block *s)
 {
 	brelse(s->su_sbh);
 	kfree(s->su_imap);
 }

 static int bfs_statfs(struct super_block *s, struct statfs *buf)
 {
 	buf->f_type = BFS_MAGIC;
 	buf->f_bsize = s->s_blocksize;
 	buf->f_blocks = s->su_blocks;
 	buf->f_bfree = buf->f_bavail = s->su_freeb;
 	buf->f_files = s->su_lasti + 1 - BFS_ROOT_INO;
 	buf->f_ffree = s->su_freei;
 	buf->f_fsid.val[0] = kdev_t_to_nr(s->s_dev);
 	buf->f_namelen = BFS_NAMELEN;
 	return 0;
 }

 static void bfs_write_super(struct super_block *s)
 {
 	if (!(s->s_flags & MS_RDONLY))
 		mark_buffer_dirty(s->su_sbh);
 	s->s_dirt = 0;
 }

 static struct super_operations bfs_sops = {
 	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_free_page(GFP_KERNEL);

 	if (!tmpbuf)
 		return;
 	for (i=s->su_lasti; i>=0; i--) {
 		if (i>PAGE_SIZE-100) break;
 		if (test_bit(i, s->su_imap))
 			strcat(tmpbuf, "1");
 		else
 			strcat(tmpbuf, "0");
 	}
 	printk(KERN_ERR "BFS-fs: %s: lasti=%08lx <%s>\n", prefix, s->su_lasti, tmpbuf);
 	free_page((unsigned long)tmpbuf);
 #endif
 }

 static struct super_block * bfs_read_super(struct super_block * s,
 	void * data, int silent)
 {
 	kdev_t dev;
 	struct buffer_head * bh;
 	struct bfs_super_block * bfs_sb;
 	struct inode * inode;
 	int i, imap_len;

 	dev = s->s_dev;
 	set_blocksize(dev, BFS_BSIZE);
 	s->s_blocksize = BFS_BSIZE;
 	s->s_blocksize_bits = BFS_BSIZE_BITS;

 	bh = bread(dev, 0, BFS_BSIZE);
 	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",
 				bdevname(dev), bfs_sb->s_magic);
 		goto out;
 	}
 	if (BFS_UNCLEAN(bfs_sb, s) && !silent)
 		printf("%s is unclean, continuing\n", bdevname(dev));

 	s->s_magic = BFS_MAGIC;
 	s->su_bfs_sb = bfs_sb;
 	s->su_sbh = bh;
 	s->su_lasti = (bfs_sb->s_start - BFS_BSIZE)/sizeof(struct bfs_inode)
 			+ BFS_ROOT_INO - 1;

 	imap_len = s->su_lasti/8 + 1;
 	s->su_imap = kmalloc(imap_len, GFP_KERNEL);
 	if (!s->su_imap)
 		goto out;
 	memset(s->su_imap, 0, imap_len);
 	for (i=0; i<BFS_ROOT_INO; i++)
 		set_bit(i, s->su_imap);

 	s->s_op = &bfs_sops;
 	inode = iget(s, BFS_ROOT_INO);
 	if (!inode) {
 		kfree(s->su_imap);
 		goto out;
 	}
 	s->s_root = d_alloc_root(inode);
 	if (!s->s_root) {
 		iput(inode);
 		kfree(s->su_imap);
 		goto out;
 	}

 	s->su_blocks = (bfs_sb->s_end + 1)>>BFS_BSIZE_BITS; /* for statfs(2) */
 	s->su_freeb = (bfs_sb->s_end + 1 - bfs_sb->s_start)>>BFS_BSIZE_BITS;
 	s->su_freei = 0;
 	s->su_lf_eblk = 0;
 	s->su_lf_sblk = 0;
 	s->su_lf_ioff = 0;
 	for (i=BFS_ROOT_INO; i<=s->su_lasti; i++) {
 		inode = iget(s,i);
 		if (inode->iu_dsk_ino == 0)
 			s->su_freei++;
 		else {
 			set_bit(i, s->su_imap);
 			s->su_freeb -= inode->i_blocks;
 			if (inode->iu_eblock > s->su_lf_eblk) {
 				s->su_lf_eblk = inode->iu_eblock;
 				s->su_lf_sblk = inode->iu_sblock;
 				s->su_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 s;

 out:
 	brelse(bh);
 	return NULL;
 }

 static DECLARE_FSTYPE_DEV(bfs_fs_type, "bfs", bfs_read_super);

 static int __init init_bfs_fs(void)
 {
 	return register_filesystem(&bfs_fs_type);
 }

 static void __exit exit_bfs_fs(void)
 {
 	unregister_filesystem(&bfs_fs_type);
 }

 module_init(init_bfs_fs)
 module_exit(exit_bfs_fs)
	/*
	* 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/locks.h>
	#include <linux/bfs_fs.h>
	#include <linux/smp_lock.h>

	#include <asm/uaccess.h>

	#include "bfs_defs.h"

	MODULE_AUTHOR("Tigran A. Aivazian <tigran@veritas.com>");
	MODULE_DESCRIPTION("SCO UnixWare BFS filesystem for Linux");
	MODULE_LICENSE("GPL");
	EXPORT_NO_SYMBOLS;

	#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;
	kdev_t dev = inode->i_dev;
	struct bfs_inode * di;
	struct buffer_head * bh;
	int block, off;

	if (ino < BFS_ROOT_INO \|\| ino > inode->i_sb->su_lasti) {
	printf("Bad inode number %s:%08lx\n", bdevname(dev), ino);
	make_bad_inode(inode);
	return;
	}

	block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1;
	bh = bread(dev, block, BFS_BSIZE);
	if (!bh) {
	printf("Unable to read inode %s:%08lx\n", bdevname(dev), 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 = di->i_atime;
	inode->i_mtime = di->i_mtime;
	inode->i_ctime = di->i_ctime;
	inode->iu_dsk_ino = di->i_ino; /* can be 0 so we store a copy */
	inode->iu_sblock = di->i_sblock;
	inode->iu_eblock = di->i_eblock;

	brelse(bh);
	}

	static void bfs_write_inode(struct inode * inode, int unused)
	{
	unsigned long ino = inode->i_ino;
	kdev_t dev = inode->i_dev;
	struct bfs_inode * di;
	struct buffer_head * bh;
	int block, off;

	if (ino < BFS_ROOT_INO \|\| ino > inode->i_sb->su_lasti) {
	printf("Bad inode number %s:%08lx\n", bdevname(dev), ino);
	return;
	}

	lock_kernel();
	block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1;
	bh = bread(dev, block, BFS_BSIZE);
	if (!bh) {
	printf("Unable to read inode %s:%08lx\n", bdevname(dev), ino);
	unlock_kernel();
	return;
	}

	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;
	di->i_mtime = inode->i_mtime;
	di->i_ctime = inode->i_ctime;
	di->i_sblock = inode->iu_sblock;
	di->i_eblock = inode->iu_eblock;
	di->i_eoffset = di->i_sblock * BFS_BSIZE + inode->i_size - 1;

	mark_buffer_dirty(bh);
	brelse(bh);
	unlock_kernel();
	}

	static void bfs_delete_inode(struct inode * inode)
	{
	unsigned long ino = inode->i_ino;
	kdev_t dev = inode->i_dev;
	struct bfs_inode * di;
	struct buffer_head * bh;
	int block, off;
	struct super_block * s = inode->i_sb;

	dprintf("ino=%08lx\n", inode->i_ino);

	if (inode->i_ino < BFS_ROOT_INO \|\| inode->i_ino > inode->i_sb->su_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;
	lock_kernel();
	mark_inode_dirty(inode);
	block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1;
	bh = bread(dev, block, BFS_BSIZE);
	if (!bh) {
	printf("Unable to read inode %s:%08lx\n", bdevname(dev), 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) {
	s->su_freeb += BFS_FILEBLOCKS(di);
	s->su_freei++;
	clear_bit(di->i_ino, s->su_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 (s->su_lf_eblk == inode->iu_eblock) {
	s->su_lf_eblk = inode->iu_sblock - 1;
	mark_buffer_dirty(s->su_sbh);
	}
	unlock_kernel();
	clear_inode(inode);
	}

	static void bfs_put_super(struct super_block *s)
	{
	brelse(s->su_sbh);
	kfree(s->su_imap);
	}

	static int bfs_statfs(struct super_block s, struct statfs buf)
	{
	buf->f_type = BFS_MAGIC;
	buf->f_bsize = s->s_blocksize;
	buf->f_blocks = s->su_blocks;
	buf->f_bfree = buf->f_bavail = s->su_freeb;
	buf->f_files = s->su_lasti + 1 - BFS_ROOT_INO;
	buf->f_ffree = s->su_freei;
	buf->f_fsid.val[0] = kdev_t_to_nr(s->s_dev);
	buf->f_namelen = BFS_NAMELEN;
	return 0;
	}

	static void bfs_write_super(struct super_block *s)
	{
	if (!(s->s_flags & MS_RDONLY))
	mark_buffer_dirty(s->su_sbh);
	s->s_dirt = 0;
	}

	static struct super_operations bfs_sops = {
	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_free_page(GFP_KERNEL);

	if (!tmpbuf)
	return;
	for (i=s->su_lasti; i>=0; i--) {
	if (i>PAGE_SIZE-100) break;
	if (test_bit(i, s->su_imap))
	strcat(tmpbuf, "1");
	else
	strcat(tmpbuf, "0");
	}
	printk(KERN_ERR "BFS-fs: %s: lasti=%08lx <%s>\n", prefix, s->su_lasti, tmpbuf);
	free_page((unsigned long)tmpbuf);
	#endif
	}

	static struct super_block * bfs_read_super(struct super_block * s,
	void * data, int silent)
	{
	kdev_t dev;
	struct buffer_head * bh;
	struct bfs_super_block * bfs_sb;
	struct inode * inode;
	int i, imap_len;

	dev = s->s_dev;
	set_blocksize(dev, BFS_BSIZE);
	s->s_blocksize = BFS_BSIZE;
	s->s_blocksize_bits = BFS_BSIZE_BITS;

	bh = bread(dev, 0, BFS_BSIZE);
	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",
	bdevname(dev), bfs_sb->s_magic);
	goto out;
	}
	if (BFS_UNCLEAN(bfs_sb, s) && !silent)
	printf("%s is unclean, continuing\n", bdevname(dev));

	s->s_magic = BFS_MAGIC;
	s->su_bfs_sb = bfs_sb;
	s->su_sbh = bh;
	s->su_lasti = (bfs_sb->s_start - BFS_BSIZE)/sizeof(struct bfs_inode)
	+ BFS_ROOT_INO - 1;

	imap_len = s->su_lasti/8 + 1;
	s->su_imap = kmalloc(imap_len, GFP_KERNEL);
	if (!s->su_imap)
	goto out;
	memset(s->su_imap, 0, imap_len);
	for (i=0; i<BFS_ROOT_INO; i++)
	set_bit(i, s->su_imap);

	s->s_op = &bfs_sops;
	inode = iget(s, BFS_ROOT_INO);
	if (!inode) {
	kfree(s->su_imap);
	goto out;
	}
	s->s_root = d_alloc_root(inode);
	if (!s->s_root) {
	iput(inode);
	kfree(s->su_imap);
	goto out;
	}

	s->su_blocks = (bfs_sb->s_end + 1)>>BFS_BSIZE_BITS; /* for statfs(2) */
	s->su_freeb = (bfs_sb->s_end + 1 - bfs_sb->s_start)>>BFS_BSIZE_BITS;
	s->su_freei = 0;
	s->su_lf_eblk = 0;
	s->su_lf_sblk = 0;
	s->su_lf_ioff = 0;
	for (i=BFS_ROOT_INO; i<=s->su_lasti; i++) {
	inode = iget(s,i);
	if (inode->iu_dsk_ino == 0)
	s->su_freei++;
	else {
	set_bit(i, s->su_imap);
	s->su_freeb -= inode->i_blocks;
	if (inode->iu_eblock > s->su_lf_eblk) {
	s->su_lf_eblk = inode->iu_eblock;
	s->su_lf_sblk = inode->iu_sblock;
	s->su_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 s;

	out:
	brelse(bh);
	return NULL;
	}

	static DECLARE_FSTYPE_DEV(bfs_fs_type, "bfs", bfs_read_super);

	static int __init init_bfs_fs(void)
	{
	return register_filesystem(&bfs_fs_type);
	}

	static void __exit exit_bfs_fs(void)
	{
	unregister_filesystem(&bfs_fs_type);
	}

	module_init(init_bfs_fs)
	module_exit(exit_bfs_fs)