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Commit 1856ffe9 authored by Chao Yu's avatar Chao Yu Committed by Jaegeuk Kim
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f2fs: introduce f2fs_bmap_compress() 



to support bmap() on compressed inode: if queried block locates in
non-compressed cluster, return its physical block address.

Signed-off-by: default avatarChao Yu <yuchao0@huawei.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent 066c14e5

fs/f2fs/data.c

+34 −0
Original line number Diff line number Diff line
@@ -3667,6 +3667,37 @@ static int f2fs_set_data_page_dirty(struct page *page) 
	return 0;

}





static sector_t f2fs_bmap_compress(struct inode *inode, sector_t block)

{

#ifdef CONFIG_F2FS_FS_COMPRESSION

	struct dnode_of_data dn;

	sector_t start_idx, blknr = 0;

	int ret;



	start_idx = round_down(block, F2FS_I(inode)->i_cluster_size);



	set_new_dnode(&dn, inode, NULL, NULL, 0);

	ret = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);

	if (ret)

		return 0;



	if (dn.data_blkaddr != COMPRESS_ADDR) {

		dn.ofs_in_node += block - start_idx;

		blknr = f2fs_data_blkaddr(&dn);

		if (!__is_valid_data_blkaddr(blknr))

			blknr = 0;

	}



	f2fs_put_dnode(&dn);



	return blknr;

#else

	return -EOPNOTSUPP;

#endif

}





static sector_t f2fs_bmap(struct address_space *mapping, sector_t block)

{

	struct inode *inode = mapping->host;
@@ -3678,6 +3709,9 @@ static sector_t f2fs_bmap(struct address_space *mapping, sector_t block) 
	if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY))

		filemap_write_and_wait(mapping);



	if (f2fs_compressed_file(inode))

		return f2fs_bmap_compress(inode, block);



	return generic_block_bmap(mapping, block, get_data_block_bmap);

}