patch-2.3.25 linux/fs/bfs/inode.c

• Lines: 376
• Date: Fri Oct 29 11:05:08 1999
• Orig file: v2.3.24/linux/fs/bfs/inode.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.24/linux/fs/bfs/inode.c linux/fs/bfs/inode.c
@@ -0,0 +1,375 @@
+/*
+ *	fs/bfs/inode.c
+ *	BFS superblock and inode operations.
+ *	Copyright (C) 1999 Tigran Aivazian <tigran@ocston.org>
+ *	From fs/minix, Copyright (C) 1991, 1992 Linus Torvalds.
+ */
+
+#include <linux/config.h>
+#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 <asm/uaccess.h>
+
+#include "bfs_defs.h"
+
+MODULE_AUTHOR("Tigran A. Aivazian");
+MODULE_DESCRIPTION("UnixWare BFS filesystem for Linux");
+EXPORT_NO_SYMBOLS;
+
+#undef DEBUG
+
+#ifdef DEBUG
+#define DBG(x...)	printk(x)
+#else
+#define DBG(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) {
+		printk(KERN_ERR "BFS-fs: %s(): Bad inode number %s:%08lx\n", 
+			__FUNCTION__, 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) {
+		printk(KERN_ERR "BFS-fs: %s(): Unable to read inode %s:%08lx\n",
+			__FUNCTION__, 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;
+	} else if (di->i_vtype == BFS_VREG) {
+		inode->i_mode |= S_IFREG;
+		inode->i_op = &bfs_file_inops;
+	} else 
+		inode->i_op = NULL;
+
+	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->i_rdev = 0; /* BFS doesn't have special nodes */
+	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)
+{
+	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) {
+		printk(KERN_ERR "BFS-fs: %s(): Bad inode number %s:%08lx\n", 
+			__FUNCTION__, bdevname(dev), ino);
+		return;
+	}
+
+	block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1;
+	bh = bread(dev, block, BFS_BSIZE);
+	if (!bh) {
+		printk(KERN_ERR "BFS-fs: %s(): Unable to read inode %s:%08lx\n",
+			__FUNCTION__, bdevname(dev), ino);
+		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, 1);
+	brelse(bh);
+}
+
+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;
+
+	DBG(KERN_ERR "%s(ino=%08lx)\n", __FUNCTION__, inode->i_ino);
+
+	if (!inode)
+		return;
+	if (!inode->i_dev) {
+		printk(KERN_ERR "BFS-fs: free_inode(%08lx) !dev\n", inode->i_ino);
+		return;
+	}
+	if (inode->i_count > 1) {
+		printk(KERN_ERR "BFS-fs: free_inode(%08lx) count=%d\n", 
+			inode->i_ino, inode->i_count);
+		return;
+	}
+	if (inode->i_nlink) {
+		printk(KERN_ERR "BFS-fs: free_inode(%08lx) nlink=%d\n", 
+			inode->i_ino, inode->i_nlink);
+		return;
+	}
+	if (!inode->i_sb) {
+		printk(KERN_ERR "BFS-fs: free_inode(%08lx) !sb\n", inode->i_ino);
+		return;
+	}
+	if (inode->i_ino < BFS_ROOT_INO || inode->i_ino > inode->i_sb->su_lasti) {
+		printk(KERN_ERR "BFS-fs: free_inode(%08lx) invalid ino\n", inode->i_ino);
+		return;
+	}
+	
+	inode->i_size = 0;
+	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+	mark_inode_dirty(inode);
+	block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1;
+	bh = bread(dev, block, BFS_BSIZE);
+	if (!bh) {
+		printk(KERN_ERR "BFS-fs: %s(): Unable to read inode %s:%08lx\n",
+			__FUNCTION__, bdevname(dev), ino);
+		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, 1);
+	brelse(bh);
+	clear_inode(inode);
+}
+
+static void bfs_put_super(struct super_block *s)
+{
+	brelse(s->su_sbh);
+	kfree(s->su_imap);
+	MOD_DEC_USE_COUNT;
+}
+
+static int bfs_statfs(struct super_block *s, struct statfs *buf, int bufsiz)
+{
+	struct statfs tmp;
+
+	tmp.f_type = BFS_MAGIC;
+	tmp.f_bsize = s->s_blocksize;
+	tmp.f_blocks = s->su_blocks;
+	tmp.f_bfree = tmp.f_bavail = s->su_freeb;
+	tmp.f_files = s->su_lasti + 1 - BFS_ROOT_INO;
+	tmp.f_ffree = s->su_freei;
+	tmp.f_fsid.val[0] = s->s_dev;
+	tmp.f_namelen = BFS_NAMELEN;
+	return copy_to_user(buf, &tmp, bufsiz) ? -EFAULT : 0;
+}
+
+static void bfs_write_super(struct super_block *s)
+{
+	if (!(s->s_flags & MS_RDONLY))
+		mark_buffer_dirty(s->su_sbh, 1);
+	s->s_dirt = 0;
+}
+
+static struct super_operations bfs_sops = {
+	read_inode:	bfs_read_inode,
+	write_inode:	bfs_write_inode,
+	put_inode:	NULL,
+	delete_inode:	bfs_delete_inode,
+	notify_change:	NULL,
+	put_super:	bfs_put_super,
+	write_super:	bfs_write_super,
+	statfs:		bfs_statfs,
+	remount_fs:	NULL,
+	clear_inode:	NULL,
+	umount_begin:	NULL
+};
+
+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;
+	memset(tmpbuf, 0, 400);
+	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=%d <%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;
+
+	MOD_INC_USE_COUNT;
+	lock_super(s);
+	dev = s->s_dev;
+	set_blocksize(dev, BFS_BSIZE);
+	s->s_blocksize = BFS_BSIZE;
+	s->s_blocksize_bits = BFS_BSIZE_BITS;
+
+	/* read ahead 8K to get inodes as we'll need them in a tick */
+	bh = breada(dev, 0, BFS_BSIZE, 0, 8192);
+	if(!bh)
+		goto out;
+	bfs_sb = (struct bfs_super_block *)bh->b_data;
+	if (bfs_sb->s_magic != BFS_MAGIC) {
+		if (!silent)
+			printk(KERN_ERR "BFS-fs: No BFS filesystem on %s (magic=%08x)\n", 
+					bdevname(dev), bfs_sb->s_magic);
+		goto out;
+	}
+	if (BFS_UNCLEAN(bfs_sb, s) && !silent)
+		printk(KERN_WARNING "BFS-fs: %s is unclean\n", bdevname(dev));
+
+#ifndef CONFIG_BFS_FS_WRITE
+	s->s_flags |= MS_RDONLY; 
+#endif
+	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, 1);
+		s->s_dirt = 1;
+	} 
+	dump_imap("read_super", s);
+	unlock_super(s);
+	return s;
+
+out:
+	brelse(bh);
+	s->s_dev = 0;
+	unlock_super(s);
+	MOD_DEC_USE_COUNT;
+	return NULL;
+}
+
+static struct file_system_type bfs_fs_type = {
+	name:		"bfs",
+	fs_flags:	FS_REQUIRES_DEV,
+	read_super:	bfs_read_super,
+	next:		NULL
+};
+
+#ifdef MODULE
+#define init_bfs_fs init_module
+
+void cleanup_module(void)
+{
+	unregister_filesystem(&bfs_fs_type);
+}
+#endif
+
+int __init init_bfs_fs(void)
+{
+	return register_filesystem(&bfs_fs_type);
+}