[PATCH v3 1/5] erofs-utils: sync up with in-kernel erofs_fs.h

[Gao Xiang]

This matches the latest in-kernel version.

Signed-off-by: Gao Xiang <xiang at kernel.org>
---
 include/erofs_fs.h | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/include/erofs_fs.h b/include/erofs_fs.h
index 52da7abaac92..18fc1820c58c 100644
--- a/include/erofs_fs.h
+++ b/include/erofs_fs.h
@@ -27,13 +27,15 @@
 	 EROFS_FEATURE_INCOMPAT_COMPR_CFGS | \
 	 EROFS_FEATURE_INCOMPAT_BIG_PCLUSTER)
 
-/* 128-byte erofs on-disk super block */
+#define EROFS_SB_EXTSLOT_SIZE	16
+
+/* erofs on-disk super block (currently 128 bytes) */
 struct erofs_super_block {
 	__le32 magic;           /* file system magic number */
 	__le32 checksum;        /* crc32c(super_block) */
 	__le32 feature_compat;
 	__u8 blkszbits;         /* support block_size == PAGE_SIZE only */
-	__u8 reserved;
+	__u8 sb_extslots;	/* superblock size = 128 + sb_extslots * 16 */
 
 	__le16 root_nid;	/* nid of root directory */
 	__le64 inos;            /* total valid ino # (== f_files - f_favail) */
@@ -49,8 +51,9 @@ struct erofs_super_block {
 	union {
 		/* bitmap for available compression algorithms */
 		__le16 available_compr_algs;
+		/* customized sliding window size instead of 64k by default */
 		__le16 lz4_max_distance;
-	} u1;
+	} __packed u1;
 	__u8 reserved2[42];
 };
 
@@ -87,6 +90,9 @@ static inline bool erofs_inode_is_data_compressed(unsigned int datamode)
 #define EROFS_I_VERSION_BIT             0
 #define EROFS_I_DATALAYOUT_BIT          1
 
+#define EROFS_I_ALL	\
+	((1 << (EROFS_I_DATALAYOUT_BIT + EROFS_I_DATALAYOUT_BITS)) - 1)
+
 /* 32-byte reduced form of an ondisk inode */
 struct erofs_inode_compact {
 	__le16 i_format;	/* inode format hints */
@@ -209,6 +215,7 @@ enum {
 	Z_EROFS_COMPRESSION_LZ4	= 0,
 	Z_EROFS_COMPRESSION_MAX
 };
+#define Z_EROFS_ALL_COMPR_ALGS		(1 << (Z_EROFS_COMPRESSION_MAX - 1))
 
 /* 14 bytes (+ length field = 16 bytes) */
 struct z_erofs_lz4_cfgs {
@@ -238,9 +245,7 @@ struct z_erofs_map_header {
 	__u8	h_algorithmtype;
 	/*
 	 * bit 0-2 : logical cluster bits - 12, e.g. 0 for 4096;
-	 * bit 3-4 : (physical - logical) cluster bits of head 1:
-	 *       For example, if logical clustersize = 4096, 1 for 8192.
-	 * bit 5-7 : (physical - logical) cluster bits of head 2.
+	 * bit 3-7 : reserved.
 	 */
 	__u8	h_clusterbits;
 };
-- 
2.20.1