inode.c

UnixBSD、SunOs、FreeBSD、NetBSD、OpenBSD和NeXTStep文件系统源代码

		bh = GET_INODE_DATABLOCK(ptr);
		goto out;
	}
	ptr -= UFS_NDIR_FRAGMENT;
	if (ptr < (1 << (uspi->s_apbshift + uspi->s_fpbshift))) {
		bh = GET_INODE_PTR(UFS_IND_FRAGMENT + (ptr >> uspi->s_apbshift));
		goto get_indirect;
	}
	ptr -= 1 << (uspi->s_apbshift + uspi->s_fpbshift);
	if (ptr < (1 << (uspi->s_2apbshift + uspi->s_fpbshift))) {
		bh = GET_INODE_PTR(UFS_DIND_FRAGMENT + (ptr >> uspi->s_2apbshift));
		goto get_double;
	}
	ptr -= 1 << (uspi->s_2apbshift + uspi->s_fpbshift);
	bh = GET_INODE_PTR(UFS_TIND_FRAGMENT + (ptr >> uspi->s_3apbshift));
	bh = GET_INDIRECT_PTR((ptr >> uspi->s_2apbshift) & uspi->s_apbmask);
get_double:
	bh = GET_INDIRECT_PTR((ptr >> uspi->s_apbshift) & uspi->s_apbmask);
get_indirect:
	bh = GET_INDIRECT_DATABLOCK(ptr & uspi->s_apbmask);

#undef GET_INODE_DATABLOCK
#undef GET_INODE_PTR
#undef GET_INDIRECT_DATABLOCK
#undef GET_INDIRECT_PTR

out:
	if (err)
		goto abort;
	if (new)
		set_buffer_new(bh_result);
	map_bh(bh_result, sb, phys);
abort:
	unlock_kernel();
	return err;

abort_negative:
	ufs_warning(sb, "ufs_get_block", "block < 0");
	goto abort;

abort_too_big:
	ufs_warning(sb, "ufs_get_block", "block > big");
	goto abort;
}

static struct buffer_head *ufs_getfrag(struct inode *inode,
				       unsigned int fragment,
				       int create, int *err)
{
	struct buffer_head dummy;
	int error;

	dummy.b_state = 0;
	dummy.b_blocknr = -1000;
	error = ufs_getfrag_block(inode, fragment, &dummy, create);
	*err = error;
	if (!error && buffer_mapped(&dummy)) {
		struct buffer_head *bh;
		bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
		if (buffer_new(&dummy)) {
			memset(bh->b_data, 0, inode->i_sb->s_blocksize);
			set_buffer_uptodate(bh);
			mark_buffer_dirty(bh);
		}
		return bh;
	}
	return NULL;
}

struct buffer_head * ufs_bread (struct inode * inode, unsigned fragment,
	int create, int * err)
{
	struct buffer_head * bh;

	UFSD("ENTER, ino %lu, fragment %u\n", inode->i_ino, fragment);
	bh = ufs_getfrag (inode, fragment, create, err);
	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);
	*err = -EIO;
	return NULL;
}

static int ufs_writepage(struct page *page, struct writeback_control *wbc)
{
	return block_write_full_page(page,ufs_getfrag_block,wbc);
}

static int ufs_readpage(struct file *file, struct page *page)
{
	return block_read_full_page(page,ufs_getfrag_block);
}

int __ufs_write_begin(struct file *file, struct address_space *mapping,
			loff_t pos, unsigned len, unsigned flags,
			struct page **pagep, void **fsdata)
{
	return block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
				ufs_getfrag_block);
}

static int ufs_write_begin(struct file *file, struct address_space *mapping,
			loff_t pos, unsigned len, unsigned flags,
			struct page **pagep, void **fsdata)
{
	*pagep = NULL;
	return __ufs_write_begin(file, mapping, pos, len, flags, pagep, fsdata);
}

static sector_t ufs_bmap(struct address_space *mapping, sector_t block)
{
	return generic_block_bmap(mapping,block,ufs_getfrag_block);
}

const struct address_space_operations ufs_aops = {
	.readpage = ufs_readpage,
	.writepage = ufs_writepage,
	.sync_page = block_sync_page,
	.write_begin = ufs_write_begin,
	.write_end = generic_write_end,
	.bmap = ufs_bmap
};

static void ufs_set_inode_ops(struct inode *inode)
{
	if (S_ISREG(inode->i_mode)) {
		inode->i_op = &ufs_file_inode_operations;
		inode->i_fop = &ufs_file_operations;
		inode->i_mapping->a_ops = &ufs_aops;
	} else if (S_ISDIR(inode->i_mode)) {
		inode->i_op = &ufs_dir_inode_operations;
		inode->i_fop = &ufs_dir_operations;
		inode->i_mapping->a_ops = &ufs_aops;
	} else if (S_ISLNK(inode->i_mode)) {
		if (!inode->i_blocks)
			inode->i_op = &ufs_fast_symlink_inode_operations;
		else {
			inode->i_op = &page_symlink_inode_operations;
			inode->i_mapping->a_ops = &ufs_aops;
		}
	} else
		init_special_inode(inode, inode->i_mode,
				   ufs_get_inode_dev(inode->i_sb, UFS_I(inode)));
}

static int ufs1_read_inode(struct inode *inode, struct ufs_inode *ufs_inode)
{
	struct ufs_inode_info *ufsi = UFS_I(inode);
	struct super_block *sb = inode->i_sb;
	mode_t mode;
	unsigned i;

	/*
	 * Copy data to the in-core inode.
	 */
	inode->i_mode = mode = fs16_to_cpu(sb, ufs_inode->ui_mode);
	inode->i_nlink = fs16_to_cpu(sb, ufs_inode->ui_nlink);
	if (inode->i_nlink == 0) {
		ufs_error (sb, "ufs_read_inode", "inode %lu has zero nlink\n", inode->i_ino);
		return -1;
	}
	
	/*
	 * Linux now has 32-bit uid and gid, so we can support EFT.
	 */
	inode->i_uid = ufs_get_inode_uid(sb, ufs_inode);
	inode->i_gid = ufs_get_inode_gid(sb, ufs_inode);

	inode->i_size = fs64_to_cpu(sb, ufs_inode->ui_size);
	inode->i_atime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_atime.tv_sec);
	inode->i_ctime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_ctime.tv_sec);
	inode->i_mtime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_mtime.tv_sec);
	inode->i_mtime.tv_nsec = 0;
	inode->i_atime.tv_nsec = 0;
	inode->i_ctime.tv_nsec = 0;
	inode->i_blocks = fs32_to_cpu(sb, ufs_inode->ui_blocks);
	inode->i_generation = fs32_to_cpu(sb, ufs_inode->ui_gen);
	ufsi->i_flags = fs32_to_cpu(sb, ufs_inode->ui_flags);
	ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
	ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);

	
	if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
		for (i = 0; i < (UFS_NDADDR + UFS_NINDIR); i++)
			ufsi->i_u1.i_data[i] = ufs_inode->ui_u2.ui_addr.ui_db[i];
	} else {
		for (i = 0; i < (UFS_NDADDR + UFS_NINDIR) * 4; i++)
			ufsi->i_u1.i_symlink[i] = ufs_inode->ui_u2.ui_symlink[i];
	}
	return 0;
}

static int ufs2_read_inode(struct inode *inode, struct ufs2_inode *ufs2_inode)
{
	struct ufs_inode_info *ufsi = UFS_I(inode);
	struct super_block *sb = inode->i_sb;
	mode_t mode;
	unsigned i;

	UFSD("Reading ufs2 inode, ino %lu\n", inode->i_ino);
	/*
	 * Copy data to the in-core inode.
	 */
	inode->i_mode = mode = fs16_to_cpu(sb, ufs2_inode->ui_mode);
	inode->i_nlink = fs16_to_cpu(sb, ufs2_inode->ui_nlink);
	if (inode->i_nlink == 0) {
		ufs_error (sb, "ufs_read_inode", "inode %lu has zero nlink\n", inode->i_ino);
		return -1;
	}

        /*
         * Linux now has 32-bit uid and gid, so we can support EFT.
         */
	inode->i_uid = fs32_to_cpu(sb, ufs2_inode->ui_uid);
	inode->i_gid = fs32_to_cpu(sb, ufs2_inode->ui_gid);

	inode->i_size = fs64_to_cpu(sb, ufs2_inode->ui_size);
	inode->i_atime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_atime);
	inode->i_ctime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_ctime);
	inode->i_mtime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_mtime);
	inode->i_atime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_atimensec);
	inode->i_ctime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_ctimensec);
	inode->i_mtime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_mtimensec);
	inode->i_blocks = fs64_to_cpu(sb, ufs2_inode->ui_blocks);
	inode->i_generation = fs32_to_cpu(sb, ufs2_inode->ui_gen);
	ufsi->i_flags = fs32_to_cpu(sb, ufs2_inode->ui_flags);
	/*
	ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
	ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
	*/

	if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
		for (i = 0; i < (UFS_NDADDR + UFS_NINDIR); i++)
			ufsi->i_u1.u2_i_data[i] =
				ufs2_inode->ui_u2.ui_addr.ui_db[i];
	} else {
		for (i = 0; i < (UFS_NDADDR + UFS_NINDIR) * 4; i++)
			ufsi->i_u1.i_symlink[i] = ufs2_inode->ui_u2.ui_symlink[i];
	}
	return 0;
}

struct inode *ufs_iget(struct super_block *sb, unsigned long ino)
{
	struct ufs_inode_info *ufsi;
	struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
	struct buffer_head * bh;
	struct inode *inode;
	int err;

	UFSD("ENTER, ino %lu\n", ino);

	if (ino < UFS_ROOTINO || ino > (uspi->s_ncg * uspi->s_ipg)) {
		ufs_warning(sb, "ufs_read_inode", "bad inode number (%lu)\n",
			    ino);
		return ERR_PTR(-EIO);
	}

	inode = iget_locked(sb, ino);
	if (!inode)
		return ERR_PTR(-ENOMEM);
	if (!(inode->i_state & I_NEW))
		return inode;

	ufsi = UFS_I(inode);

	bh = sb_bread(sb, uspi->s_sbbase + ufs_inotofsba(inode->i_ino));
	if (!bh) {
		ufs_warning(sb, "ufs_read_inode", "unable to read inode %lu\n",
			    inode->i_ino);
		goto bad_inode;
	}
	if ((UFS_SB(sb)->s_flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2) {
		struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;

		err = ufs2_read_inode(inode,
				      ufs2_inode + ufs_inotofsbo(inode->i_ino));
	} else {
		struct ufs_inode *ufs_inode = (struct ufs_inode *)bh->b_data;

		err = ufs1_read_inode(inode,
				      ufs_inode + ufs_inotofsbo(inode->i_ino));
	}

	if (err)
		goto bad_inode;
	inode->i_version++;
	ufsi->i_lastfrag =
		(inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift;
	ufsi->i_dir_start_lookup = 0;
	ufsi->i_osync = 0;

	ufs_set_inode_ops(inode);

	brelse(bh);

	UFSD("EXIT\n");
	unlock_new_inode(inode);
	return inode;

bad_inode:
	iget_failed(inode);
	return ERR_PTR(-EIO);
}

static void ufs1_update_inode(struct inode *inode, struct ufs_inode *ufs_inode)
{
	struct super_block *sb = inode->i_sb;
 	struct ufs_inode_info *ufsi = UFS_I(inode);
 	unsigned i;

	ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
	ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);

	ufs_set_inode_uid(sb, ufs_inode, inode->i_uid);
	ufs_set_inode_gid(sb, ufs_inode, inode->i_gid);
		
	ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
	ufs_inode->ui_atime.tv_sec = cpu_to_fs32(sb, inode->i_atime.tv_sec);
	ufs_inode->ui_atime.tv_usec = 0;
	ufs_inode->ui_ctime.tv_sec = cpu_to_fs32(sb, inode->i_ctime.tv_sec);
	ufs_inode->ui_ctime.tv_usec = 0;
	ufs_inode->ui_mtime.tv_sec = cpu_to_fs32(sb, inode->i_mtime.tv_sec);
	ufs_inode->ui_mtime.tv_usec = 0;
	ufs_inode->ui_blocks = cpu_to_fs32(sb, inode->i_blocks);
	ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
	ufs_inode->ui_gen = cpu_to_fs32(sb, inode->i_generation);

	if ((UFS_SB(sb)->s_flags & UFS_UID_MASK) == UFS_UID_EFT) {
		ufs_inode->ui_u3.ui_sun.ui_shadow = cpu_to_fs32(sb, ufsi->i_shadow);
		ufs_inode->ui_u3.ui_sun.ui_oeftflag = cpu_to_fs32(sb, ufsi->i_oeftflag);
	}

	if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
		/* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
		ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.i_data[0];
	} else if (inode->i_blocks) {
		for (i = 0; i < (UFS_NDADDR + UFS_NINDIR); i++)
			ufs_inode->ui_u2.ui_addr.ui_db[i] = ufsi->i_u1.i_data[i];
	}
	else {
		for (i = 0; i < (UFS_NDADDR + UFS_NINDIR) * 4; i++)
			ufs_inode->ui_u2.ui_symlink[i] = ufsi->i_u1.i_symlink[i];
	}

	if (!inode->i_nlink)
		memset (ufs_inode, 0, sizeof(struct ufs_inode));
}

static void ufs2_update_inode(struct inode *inode, struct ufs2_inode *ufs_inode)
{
	struct super_block *sb = inode->i_sb;
 	struct ufs_inode_info *ufsi = UFS_I(inode);
 	unsigned i;

	UFSD("ENTER\n");
	ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
	ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);

	ufs_inode->ui_uid = cpu_to_fs32(sb, inode->i_uid);
	ufs_inode->ui_gid = cpu_to_fs32(sb, inode->i_gid);

	ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
	ufs_inode->ui_atime = cpu_to_fs64(sb, inode->i_atime.tv_sec);
	ufs_inode->ui_atimensec = cpu_to_fs32(sb, inode->i_atime.tv_nsec);
	ufs_inode->ui_ctime = cpu_to_fs64(sb, inode->i_ctime.tv_sec);
	ufs_inode->ui_ctimensec = cpu_to_fs32(sb, inode->i_ctime.tv_nsec);
	ufs_inode->ui_mtime = cpu_to_fs64(sb, inode->i_mtime.tv_sec);
	ufs_inode->ui_mtimensec = cpu_to_fs32(sb, inode->i_mtime.tv_nsec);

	ufs_inode->ui_blocks = cpu_to_fs64(sb, inode->i_blocks);
	ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
	ufs_inode->ui_gen = cpu_to_fs32(sb, inode->i_generation);

	if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
		/* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
		ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.u2_i_data[0];
	} else if (inode->i_blocks) {
		for (i = 0; i < (UFS_NDADDR + UFS_NINDIR); i++)
			ufs_inode->ui_u2.ui_addr.ui_db[i] = ufsi->i_u1.u2_i_data[i];
	} else {
		for (i = 0; i < (UFS_NDADDR + UFS_NINDIR) * 4; i++)
			ufs_inode->ui_u2.ui_symlink[i] = ufsi->i_u1.i_symlink[i];
 	}

	if (!inode->i_nlink)
		memset (ufs_inode, 0, sizeof(struct ufs2_inode));
	UFSD("EXIT\n");
}

static int ufs_update_inode(struct inode * inode, int do_sync)
{
	struct super_block *sb = inode->i_sb;
	struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
	struct buffer_head * bh;

	UFSD("ENTER, ino %lu\n", inode->i_ino);

	if (inode->i_ino < UFS_ROOTINO ||
	    inode->i_ino > (uspi->s_ncg * uspi->s_ipg)) {
		ufs_warning (sb, "ufs_read_inode", "bad inode number (%lu)\n", inode->i_ino);
		return -1;
	}

	bh = sb_bread(sb, ufs_inotofsba(inode->i_ino));
	if (!bh) {
		ufs_warning (sb, "ufs_read_inode", "unable to read inode %lu\n", inode->i_ino);
		return -1;
	}
	if (uspi->fs_magic == UFS2_MAGIC) {
		struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;

		ufs2_update_inode(inode,
				  ufs2_inode + ufs_inotofsbo(inode->i_ino));
	} else {
		struct ufs_inode *ufs_inode = (struct ufs_inode *) bh->b_data;

		ufs1_update_inode(inode, ufs_inode + ufs_inotofsbo(inode->i_ino));
	}
		
	mark_buffer_dirty(bh);
	if (do_sync)
		sync_dirty_buffer(bh);
	brelse (bh);
	
	UFSD("EXIT\n");
	return 0;
}

int ufs_write_inode (struct inode * inode, int wait)
{
	int ret;
	lock_kernel();
	ret = ufs_update_inode (inode, wait);
	unlock_kernel();
	return ret;
}

int ufs_sync_inode (struct inode *inode)
{
	return ufs_update_inode (inode, 1);
}

void ufs_delete_inode (struct inode * inode)
{
	loff_t old_i_size;

	truncate_inode_pages(&inode->i_data, 0);
	if (is_bad_inode(inode))
		goto no_delete;
	/*UFS_I(inode)->i_dtime = CURRENT_TIME;*/
	lock_kernel();
	mark_inode_dirty(inode);
	ufs_update_inode(inode, IS_SYNC(inode));
	old_i_size = inode->i_size;
	inode->i_size = 0;
	if (inode->i_blocks && ufs_truncate(inode, old_i_size))
		ufs_warning(inode->i_sb, __func__, "ufs_truncate failed\n");
	ufs_free_inode (inode);
	unlock_kernel();
	return;
no_delete:
	clear_inode(inode);	/* We must guarantee clearing of inode... */
}