erofs: rename lz4_0pading to zero_padding

Renaming lz4_0padding to zero_padding globally since LZMA and later
algorithms also need that.

Link: https://lore.kernel.org/r/20211112160935.19394-1-jnhuang95@gmail.comReviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Huang Jianan <huangjianan@oppo.com>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

fs/erofs/decompressor.c

@@ -195,8 +195,8 @@ static int z_erofs_lz4_decompress_mem(struct z_erofs_decompress_req *rq,
 	inputmargin = 0;
 	support_0padding = false;
 
-	/* decompression inplace is only safe when 0padding is enabled */
-	if (erofs_sb_has_lz4_0padding(EROFS_SB(rq->sb))) {
+	/* decompression inplace is only safe when zero_padding is enabled */
+	if (erofs_sb_has_zero_padding(EROFS_SB(rq->sb))) {
 		support_0padding = true;
 
 		while (!headpage[inputmargin & ~PAGE_MASK])

fs/erofs/erofs_fs.h

@@ -17,14 +17,14 @@
  * Any bits that aren't in EROFS_ALL_FEATURE_INCOMPAT should
  * be incompatible with this kernel version.
  */
-#define EROFS_FEATURE_INCOMPAT_LZ4_0PADDING	0x00000001
+#define EROFS_FEATURE_INCOMPAT_ZERO_PADDING	0x00000001
 #define EROFS_FEATURE_INCOMPAT_COMPR_CFGS	0x00000002
 #define EROFS_FEATURE_INCOMPAT_BIG_PCLUSTER	0x00000002
 #define EROFS_FEATURE_INCOMPAT_CHUNKED_FILE	0x00000004
 #define EROFS_FEATURE_INCOMPAT_DEVICE_TABLE	0x00000008
 #define EROFS_FEATURE_INCOMPAT_COMPR_HEAD2	0x00000008
 #define EROFS_ALL_FEATURE_INCOMPAT		\
-	(EROFS_FEATURE_INCOMPAT_LZ4_0PADDING | \
+	(EROFS_FEATURE_INCOMPAT_ZERO_PADDING | \
 	 EROFS_FEATURE_INCOMPAT_COMPR_CFGS | \
 	 EROFS_FEATURE_INCOMPAT_BIG_PCLUSTER | \
 	 EROFS_FEATURE_INCOMPAT_CHUNKED_FILE | \

fs/erofs/internal.h

@@ -258,7 +258,7 @@ static inline bool erofs_sb_has_##name(struct erofs_sb_info *sbi) \
 	return sbi->feature_##compat & EROFS_FEATURE_##feature; \
 }
 
-EROFS_FEATURE_FUNCS(lz4_0padding, incompat, INCOMPAT_LZ4_0PADDING)
+EROFS_FEATURE_FUNCS(zero_padding, incompat, INCOMPAT_ZERO_PADDING)
 EROFS_FEATURE_FUNCS(compr_cfgs, incompat, INCOMPAT_COMPR_CFGS)
 EROFS_FEATURE_FUNCS(big_pcluster, incompat, INCOMPAT_BIG_PCLUSTER)
 EROFS_FEATURE_FUNCS(device_table, incompat, INCOMPAT_DEVICE_TABLE)