patch-2.1.21 linux/fs/ext/inode.c

• Lines: 478
• Date: Thu Jan 1 02:00:00 1970
• Orig file: v2.1.20/linux/fs/ext/inode.c
• Orig date: Mon Dec 30 15:39:13 1996

diff -u --recursive --new-file v2.1.20/linux/fs/ext/inode.c linux/fs/ext/inode.c
@@ -1,477 +0,0 @@
-/*
- *  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/module.h>
-
-#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/uaccess.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);
-	MOD_DEC_USE_COUNT;
-	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;
-	kdev_t dev = s->s_dev;
-	int block;
-
-	MOD_INC_USE_COUNT;
-	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");
-		MOD_DEC_USE_COUNT;
-		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 "
-			       "%s.\n", kdevname(dev));
-		MOD_DEC_USE_COUNT;
-		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);
-			MOD_DEC_USE_COUNT;
-			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);
-			MOD_DEC_USE_COUNT;
-			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");
-		MOD_DEC_USE_COUNT;
-		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, int bufsiz)
-{
-	struct statfs tmp;
-
-	tmp.f_type = EXT_SUPER_MAGIC;
-	tmp.f_bsize = 1024;
-	tmp.f_blocks = sb->u.ext_sb.s_nzones << sb->u.ext_sb.s_log_zone_size;
-	tmp.f_bfree = ext_count_free_blocks(sb);
-	tmp.f_bavail = tmp.f_bfree;
-	tmp.f_files = sb->u.ext_sb.s_ninodes;
-	tmp.f_ffree = ext_count_free_inodes(sb);
-	tmp.f_namelen = EXT_NAME_LEN;
-	copy_to_user(buf, &tmp, bufsiz);
-}
-
-#define inode_bmap(inode,nr) ((inode)->u.ext_i.i_data[(nr)])
-
-static inline 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 (!buffer_uptodate(bh)) {
-		ll_rw_block(READ, 1, &bh);
-		wait_on_buffer(bh);
-		if (!buffer_uptodate(bh)) {
-			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 || buffer_uptodate(bh))
-		return bh;
-	ll_rw_block(READ, 1, &bh);
-	wait_on_buffer(bh);
-	if (buffer_uptodate(bh))
-		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 = to_kdev_t(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] = kdev_t_to_nr(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 && buffer_dirty(bh))
-	{
-		ll_rw_block(WRITE, 1, &bh);
-		wait_on_buffer(bh);
-		if (buffer_req(bh) && !buffer_uptodate(bh))
-		{
-			printk ("IO error syncing ext inode ["
-				"%s:%08lx]\n",
-				kdevname(inode->i_dev), inode->i_ino);
-			err = -1;
-		}
-	}
-	else if (!bh)
-		err = -1;
-	brelse (bh);
-	return err;
-}
-
-
-static struct file_system_type ext_fs_type = {
-        ext_read_super, "ext", 1, NULL
-};
-
-int init_ext_fs(void)
-{
-        return register_filesystem(&ext_fs_type);
-}
-
-#ifdef MODULE
-EXPORT_NO_SYMBOLS;
-
-int init_module(void)
-{
-	return init_ext_fs();
-}
-
-void cleanup_module(void)
-{
-        unregister_filesystem(&ext_fs_type);
-}
-
-#endif