[PATCH v2 1/4] erofs: introduce erofs_sb_has_xxx() helpers

[Gao Xiang via Linux-erofs]

From: Gao Xiang <hsiang...@redhat.com>

Introduce erofs_sb_has_xxx() to make long checks short, especially
for later big pcluster & LZMA features.

Reviewed-by: Chao Yu <yuch...@huawei.com>
Signed-off-by: Gao Xiang <hsiang...@redhat.com>
---
 fs/erofs/decompressor.c | 3 +--
 fs/erofs/internal.h     | 9 +++++++++
 fs/erofs/super.c        | 2 +-
 3 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/fs/erofs/decompressor.c b/fs/erofs/decompressor.c
index 34e73ff76f89..80e8871aef71 100644
--- a/fs/erofs/decompressor.c
+++ b/fs/erofs/decompressor.c
@@ -124,8 +124,7 @@ static int z_erofs_lz4_decompress(struct 
z_erofs_decompress_req *rq, u8 *out)
        support_0padding = false;
 
        /* decompression inplace is only safe when 0padding is enabled */
-       if (EROFS_SB(rq->sb)->feature_incompat &
-           EROFS_FEATURE_INCOMPAT_LZ4_0PADDING) {
+       if (erofs_sb_has_lz4_0padding(EROFS_SB(rq->sb))) {
                support_0padding = true;
 
                while (!src[inputmargin & ~PAGE_MASK])
diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
index 30e63b73a675..d29fc0c56032 100644
--- a/fs/erofs/internal.h
+++ b/fs/erofs/internal.h
@@ -218,6 +218,15 @@ static inline erofs_off_t iloc(struct erofs_sb_info *sbi, 
erofs_nid_t nid)
        return blknr_to_addr(sbi->meta_blkaddr) + (nid << sbi->islotbits);
 }
 
+#define EROFS_FEATURE_FUNCS(name, compat, feature) \
+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(sb_chksum, compat, COMPAT_SB_CHKSUM)
+
 /* atomic flag definitions */
 #define EROFS_I_EA_INITED_BIT  0
 #define EROFS_I_Z_INITED_BIT   1
diff --git a/fs/erofs/super.c b/fs/erofs/super.c
index 0445d09b6331..991b99eaf22a 100644
--- a/fs/erofs/super.c
+++ b/fs/erofs/super.c
@@ -149,7 +149,7 @@ static int erofs_read_superblock(struct super_block *sb)
        }
 
        sbi->feature_compat = le32_to_cpu(dsb->feature_compat);
-       if (sbi->feature_compat & EROFS_FEATURE_COMPAT_SB_CHKSUM) {
+       if (erofs_sb_has_sb_chksum(sbi)) {
                ret = erofs_superblock_csum_verify(sb, data);
                if (ret)
                        goto out;
-- 
2.20.1