f2fs: add feature facility in superblock

This patch introduces a feature in superblock, which will indicate any new
features for f2fs.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index cd9748a..e1dd986 100644 (file)
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -70,6 +70,13 @@ struct f2fs_mount_info {
        unsigned int    opt;
 };
 
+#define F2FS_HAS_FEATURE(sb, mask)                                     \
+       ((F2FS_SB(sb)->raw_super->feature & cpu_to_le32(mask)) != 0)
+#define F2FS_SET_FEATURE(sb, mask)                                     \
+       F2FS_SB(sb)->raw_super->feature |= cpu_to_le32(mask)
+#define F2FS_CLEAR_FEATURE(sb, mask)                                   \
+       F2FS_SB(sb)->raw_super->feature &= ~cpu_to_le32(mask)
+
 #define CRCPOLY_LE 0xedb88320
 
 static inline __u32 f2fs_crc32(void *buf, size_t len)

diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h
index 8d345c2..d44e97f 100644 (file)
--- a/include/linux/f2fs_fs.h
+++ b/include/linux/f2fs_fs.h
@@ -90,7 +90,8 @@ struct f2fs_super_block {
        __le32 cp_payload;
        __u8 version[VERSION_LEN];      /* the kernel version */
        __u8 init_version[VERSION_LEN]; /* the initial kernel version */
-       __u8 reserved[892];             /* valid reserved region */
+       __le32 feature;                 /* defined features */
+       __u8 reserved[888];             /* valid reserved region */
 } __packed;
 
 /*