예제 #1
0
int hfsplus_free_fork(struct super_block *sb, u32 cnid,
		struct hfsplus_fork_raw *fork, int type)
{
	struct hfs_find_data fd;
	hfsplus_extent_rec ext_entry;
	u32 total_blocks, blocks, start;
	int res, i;

	total_blocks = be32_to_cpu(fork->total_blocks);
	if (!total_blocks)
		return 0;

	blocks = 0;
	for (i = 0; i < 8; i++)
		blocks += be32_to_cpu(fork->extents[i].block_count);

	res = hfsplus_free_extents(sb, fork->extents, blocks, blocks);
	if (res)
		return res;
	if (total_blocks == blocks)
		return 0;

	res = hfs_find_init(HFSPLUS_SB(sb)->ext_tree, &fd);
	if (res)
		return res;
	do {
		res = __hfsplus_ext_read_extent(&fd, ext_entry, cnid,
						total_blocks, type);
		if (res)
			break;
		start = be32_to_cpu(fd.key->ext.start_block);
		hfsplus_free_extents(sb, ext_entry,
				     total_blocks - start,
				     total_blocks);
		hfs_brec_remove(&fd);
		total_blocks = start;
	} while (total_blocks > blocks);
	hfs_find_exit(&fd);

	return res;
}
예제 #2
0
void hfsplus_file_truncate(struct inode *inode)
{
	struct super_block *sb = inode->i_sb;
	struct hfs_find_data fd;
	u32 alloc_cnt, blk_cnt, start;
	int res;

	dprint(DBG_INODE, "truncate: %lu, %Lu -> %Lu\n", inode->i_ino,
	       (long long)HFSPLUS_I(inode).phys_size, inode->i_size);
	if (inode->i_size > HFSPLUS_I(inode).phys_size) {
		struct address_space *mapping = inode->i_mapping;
		struct page *page;
		u32 size = inode->i_size - 1;
		int res;

		page = grab_cache_page(mapping, size >> PAGE_CACHE_SHIFT);
		if (!page)
			return;
		size &= PAGE_CACHE_SIZE - 1;
		size++;
		res = mapping->a_ops->prepare_write(NULL, page, size, size);
		if (!res)
			res = mapping->a_ops->commit_write(NULL, page, size, size);
		if (res)
			inode->i_size = HFSPLUS_I(inode).phys_size;
		unlock_page(page);
		page_cache_release(page);
		mark_inode_dirty(inode);
		return;
	}
	blk_cnt = (inode->i_size + HFSPLUS_SB(sb).alloc_blksz - 1) >> HFSPLUS_SB(sb).alloc_blksz_shift;
	alloc_cnt = HFSPLUS_I(inode).alloc_blocks;
	if (blk_cnt == alloc_cnt)
		goto out;

	down(&HFSPLUS_I(inode).extents_lock);
	hfs_find_init(HFSPLUS_SB(sb).ext_tree, &fd);
	while (1) {
		if (alloc_cnt == HFSPLUS_I(inode).first_blocks) {
			hfsplus_free_extents(sb, HFSPLUS_I(inode).first_extents,
					     alloc_cnt, alloc_cnt - blk_cnt);
			hfsplus_dump_extent(HFSPLUS_I(inode).first_extents);
			HFSPLUS_I(inode).first_blocks = blk_cnt;
			break;
		}
		res = __hfsplus_ext_cache_extent(&fd, inode, alloc_cnt);
		if (res)
			break;
		start = HFSPLUS_I(inode).cached_start;
		hfsplus_free_extents(sb, HFSPLUS_I(inode).cached_extents,
				     alloc_cnt - start, alloc_cnt - blk_cnt);
		hfsplus_dump_extent(HFSPLUS_I(inode).cached_extents);
		if (blk_cnt > start) {
			HFSPLUS_I(inode).flags |= HFSPLUS_FLG_EXT_DIRTY;
			break;
		}
		alloc_cnt = start;
		HFSPLUS_I(inode).cached_start = HFSPLUS_I(inode).cached_blocks = 0;
		HFSPLUS_I(inode).flags &= ~(HFSPLUS_FLG_EXT_DIRTY | HFSPLUS_FLG_EXT_NEW);
		hfs_brec_remove(&fd);
	}
	hfs_find_exit(&fd);
	up(&HFSPLUS_I(inode).extents_lock);

	HFSPLUS_I(inode).alloc_blocks = blk_cnt;
out:
	HFSPLUS_I(inode).phys_size = inode->i_size;
	mark_inode_dirty(inode);
	inode->i_blocks = (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
}
예제 #3
0
void hfsplus_file_truncate(struct inode *inode)
{
	struct super_block *sb = inode->i_sb;
	struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
	struct hfs_find_data fd;
	u32 alloc_cnt, blk_cnt, start;
	int res;

	hfs_dbg(INODE, "truncate: %lu, %llu -> %llu\n",
		inode->i_ino, (long long)hip->phys_size, inode->i_size);

	if (inode->i_size > hip->phys_size) {
		struct address_space *mapping = inode->i_mapping;
		struct page *page;
		void *fsdata;
		loff_t size = inode->i_size;

		res = pagecache_write_begin(NULL, mapping, size, 0,
						AOP_FLAG_UNINTERRUPTIBLE,
						&page, &fsdata);
		if (res)
			return;
		res = pagecache_write_end(NULL, mapping, size,
			0, 0, page, fsdata);
		if (res < 0)
			return;
		mark_inode_dirty(inode);
		return;
	} else if (inode->i_size == hip->phys_size)
		return;

	blk_cnt = (inode->i_size + HFSPLUS_SB(sb)->alloc_blksz - 1) >>
			HFSPLUS_SB(sb)->alloc_blksz_shift;

	mutex_lock(&hip->extents_lock);

	alloc_cnt = hip->alloc_blocks;
	if (blk_cnt == alloc_cnt)
		goto out_unlock;

	res = hfs_find_init(HFSPLUS_SB(sb)->ext_tree, &fd);
	if (res) {
		mutex_unlock(&hip->extents_lock);
		/* XXX: We lack error handling of hfsplus_file_truncate() */
		return;
	}
	while (1) {
		if (alloc_cnt == hip->first_blocks) {
			hfsplus_free_extents(sb, hip->first_extents,
					     alloc_cnt, alloc_cnt - blk_cnt);
			hfsplus_dump_extent(hip->first_extents);
			hip->first_blocks = blk_cnt;
			break;
		}
		res = __hfsplus_ext_cache_extent(&fd, inode, alloc_cnt);
		if (res)
			break;
		start = hip->cached_start;
		hfsplus_free_extents(sb, hip->cached_extents,
				     alloc_cnt - start, alloc_cnt - blk_cnt);
		hfsplus_dump_extent(hip->cached_extents);
		if (blk_cnt > start) {
			hip->extent_state |= HFSPLUS_EXT_DIRTY;
			break;
		}
		alloc_cnt = start;
		hip->cached_start = hip->cached_blocks = 0;
		hip->extent_state &= ~(HFSPLUS_EXT_DIRTY | HFSPLUS_EXT_NEW);
		hfs_brec_remove(&fd);
	}
	hfs_find_exit(&fd);

	hip->alloc_blocks = blk_cnt;
out_unlock:
	mutex_unlock(&hip->extents_lock);
	hip->phys_size = inode->i_size;
	hip->fs_blocks = (inode->i_size + sb->s_blocksize - 1) >>
		sb->s_blocksize_bits;
	inode_set_bytes(inode, hip->fs_blocks << sb->s_blocksize_bits);
	hfsplus_mark_inode_dirty(inode, HFSPLUS_I_ALLOC_DIRTY);
}