[PATCH 5/8] staging: erofs: rearrange vle clustertype definitions

Chao Yu
2018-08-12T14:02:51Z

From: Gao Xiang <gaoxiang25@huawei.com>

This patch moves vle clustertype definitions to erofs_fs.h
since they are part of on-disk format.

It also adds compile time check for Z_EROFS_VLE_DI_CLUSTER_TYPE_BITS

Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Chao Yu <yuchao0@huawei.com>
---
drivers/staging/erofs/erofs_fs.h | 11 +++++++++++
drivers/staging/erofs/unzip_vle.c | 8 --------
2 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/drivers/staging/erofs/erofs_fs.h b/drivers/staging/erofs/erofs_fs.h
index 2f8e2bf70941..d4bffa2852b3 100644
--- a/drivers/staging/erofs/erofs_fs.h
+++ b/drivers/staging/erofs/erofs_fs.h
@@ -202,6 +202,14 @@ struct erofs_extent_header {
* di_u.delta[1] = distance to its corresponding tail cluster
* (di_advise could be 0, 1 or 2)
*/
+enum {
+ Z_EROFS_VLE_CLUSTER_TYPE_PLAIN,
+ Z_EROFS_VLE_CLUSTER_TYPE_HEAD,
+ Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD,
+ Z_EROFS_VLE_CLUSTER_TYPE_RESERVED,
+ Z_EROFS_VLE_CLUSTER_TYPE_MAX
+};
+
#define Z_EROFS_VLE_DI_CLUSTER_TYPE_BITS 2
#define Z_EROFS_VLE_DI_CLUSTER_TYPE_BIT 0

@@ -260,6 +268,9 @@ static inline void erofs_check_ondisk_layout_definitions(void)
BUILD_BUG_ON(sizeof(struct erofs_extent_header) != 16);
BUILD_BUG_ON(sizeof(struct z_erofs_vle_decompressed_index) != 8);
BUILD_BUG_ON(sizeof(struct erofs_dirent) != 12);
+
+ BUILD_BUG_ON(BIT(Z_EROFS_VLE_DI_CLUSTER_TYPE_BITS) <
+ Z_EROFS_VLE_CLUSTER_TYPE_MAX - 1);
}

#endif
diff --git a/drivers/staging/erofs/unzip_vle.c b/drivers/staging/erofs/unzip_vle.c
index 5032b3b05de1..f597f079d579 100644
--- a/drivers/staging/erofs/unzip_vle.c
+++ b/drivers/staging/erofs/unzip_vle.c
@@ -1416,14 +1416,6 @@ const struct address_space_operations z_erofs_vle_normalaccess_aops = {
#define __vle_cluster_type(advise) __vle_cluster_advise(advise, \
Z_EROFS_VLE_DI_CLUSTER_TYPE_BIT, Z_EROFS_VLE_DI_CLUSTER_TYPE_BITS)

-enum {
- Z_EROFS_VLE_CLUSTER_TYPE_PLAIN,
- Z_EROFS_VLE_CLUSTER_TYPE_HEAD,
- Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD,
- Z_EROFS_VLE_CLUSTER_TYPE_RESERVED,
- Z_EROFS_VLE_CLUSTER_TYPE_MAX
-};
-
#define vle_cluster_type(di) \
__vle_cluster_type((di)->di_advise)

--
2.18.0