erofs: introduce z_erofs_fixup_insize
To prepare for the upcoming ztailpacking feature, introduce
z_erofs_fixup_insize() and pageofs_in to wrap up the process
to get the exact compressed size via zero padding.
Link: https://lore.kernel.org/r/20211228054604.114518-3-hsiangkao@linux.alibaba.com
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
diff --git a/fs/erofs/compress.h b/fs/erofs/compress.h
index 5794065..19e6c56 100644
--- a/fs/erofs/compress.h
+++ b/fs/erofs/compress.h
@@ -12,7 +12,7 @@ struct z_erofs_decompress_req {
struct super_block *sb;
struct page **in, **out;
- unsigned short pageofs_out;
+ unsigned short pageofs_in, pageofs_out;
unsigned int inputsize, outputsize;
/* indicate the algorithm will be used for decompression */
@@ -87,6 +87,8 @@ static inline bool erofs_page_is_managed(const struct erofs_sb_info *sbi,
return page->mapping == MNGD_MAPPING(sbi);
}
+int z_erofs_fixup_insize(struct z_erofs_decompress_req *rq, const char *padbuf,
+ unsigned int padbufsize);
int z_erofs_decompress(struct z_erofs_decompress_req *rq,
struct page **pagepool);
