[PATCH] erofs: get rid of z_erofs_fill_inode()

[Gao Xiang]

Prior to big pclusters, non-compact compression indexes could have
empty headers.

Let's just avoid the legacy path since it can be handled properly
as a specific compression header with z_erofs_fill_inode_lazy() too.

Tested with erofs-utils exist versions.

Signed-off-by: Gao Xiang <hsiang...@linux.alibaba.com>
---
 fs/erofs/inode.c    |  8 +++++---
 fs/erofs/internal.h |  2 --
 fs/erofs/zmap.c     | 18 ------------------
 3 files changed, 5 insertions(+), 23 deletions(-)

diff --git a/fs/erofs/inode.c b/fs/erofs/inode.c
index 7ca9aafb7471..4438ed5b08be 100644
--- a/fs/erofs/inode.c
+++ b/fs/erofs/inode.c
@@ -292,10 +292,12 @@ static int erofs_fill_inode(struct inode *inode)
 
        if (erofs_inode_is_data_compressed(vi->datalayout)) {
                if (!erofs_is_fscache_mode(inode->i_sb) &&
-                   inode->i_sb->s_blocksize_bits == PAGE_SHIFT)
-                       err = z_erofs_fill_inode(inode);
-               else
+                   inode->i_sb->s_blocksize_bits == PAGE_SHIFT) {
+                       inode->i_mapping->a_ops = &z_erofs_aops;
+                       err = 0;
+               } else {
                        err = -EOPNOTSUPP;
+               }
                goto out_unlock;
        }
        inode->i_mapping->a_ops = &erofs_raw_access_aops;
diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
index f675050af2bb..f1268cb6a37c 100644
--- a/fs/erofs/internal.h
+++ b/fs/erofs/internal.h
@@ -522,7 +522,6 @@ int erofs_try_to_free_cached_page(struct page *page);
 int z_erofs_load_lz4_config(struct super_block *sb,
                            struct erofs_super_block *dsb,
                            struct z_erofs_lz4_cfgs *lz4, int len);
-int z_erofs_fill_inode(struct inode *inode);
 int z_erofs_map_blocks_iter(struct inode *inode, struct erofs_map_blocks *map,
                            int flags);
 #else
@@ -542,7 +541,6 @@ static inline int z_erofs_load_lz4_config(struct 
super_block *sb,
        }
        return 0;
 }
-static inline int z_erofs_fill_inode(struct inode *inode) { return 
-EOPNOTSUPP; }
 #endif /* !CONFIG_EROFS_FS_ZIP */
 
 #ifdef CONFIG_EROFS_FS_ZIP_LZMA
diff --git a/fs/erofs/zmap.c b/fs/erofs/zmap.c
index 7ca108c3834c..14c21284d019 100644
--- a/fs/erofs/zmap.c
+++ b/fs/erofs/zmap.c
@@ -7,24 +7,6 @@
 #include <asm/unaligned.h>
 #include <trace/events/erofs.h>
 
-int z_erofs_fill_inode(struct inode *inode)
-{
-       struct erofs_inode *const vi = EROFS_I(inode);
-       struct erofs_sb_info *sbi = EROFS_SB(inode->i_sb);
-
-       if (!erofs_sb_has_big_pcluster(sbi) &&
-           !erofs_sb_has_ztailpacking(sbi) && !erofs_sb_has_fragments(sbi) &&
-           vi->datalayout == EROFS_INODE_COMPRESSED_FULL) {
-               vi->z_advise = 0;
-               vi->z_algorithmtype[0] = 0;
-               vi->z_algorithmtype[1] = 0;
-               vi->z_logical_clusterbits = inode->i_sb->s_blocksize_bits;
-               set_bit(EROFS_I_Z_INITED_BIT, &vi->flags);
-       }
-       inode->i_mapping->a_ops = &z_erofs_aops;
-       return 0;
-}
-
 struct z_erofs_maprecorder {
        struct inode *inode;
        struct erofs_map_blocks *map;
-- 
2.24.4