ocfs2: Add backup superblock info to ocfs2_fs.h (50af94b1) · Commits · e / devices / android_kernel_sony_msm8994

fs/ocfs2/ocfs2_fs.h

+42 −1

Original line number	Diff line number	Diff line
		@@ -85,7 +85,7 @@
		#define OCFS2_CLEAR_INCOMPAT_FEATURE(sb,mask) \
		OCFS2_SB(sb)->s_feature_incompat &= ~(mask)

		#define OCFS2_FEATURE_COMPAT_SUPP 0
		#define OCFS2_FEATURE_COMPAT_SUPP OCFS2_FEATURE_COMPAT_BACKUP_SB
		#define OCFS2_FEATURE_INCOMPAT_SUPP OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT
		#define OCFS2_FEATURE_RO_COMPAT_SUPP 0

		@@ -109,6 +109,20 @@
		/* Support for sparse allocation in b-trees */
		#define OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC 0x0010

		/*
		* backup superblock flag is used to indicate that this volume
		* has backup superblocks.
		*/
		#define OCFS2_FEATURE_COMPAT_BACKUP_SB 0x0001

		/* The byte offset of the first backup block will be 1G.
		* The following will be 4G, 16G, 64G, 256G and 1T.
		*/
		#define OCFS2_BACKUP_SB_START 1 << 30

		/* the max backup superblock nums */
		#define OCFS2_MAX_BACKUP_SUPERBLOCKS 6

		/*
		* Flags on ocfs2_dinode.i_flags
		*/
		@@ -566,6 +580,20 @@ static inline int ocfs2_truncate_recs_per_inode(struct super_block *sb)

		return size / sizeof(struct ocfs2_truncate_rec);
		}

		static inline u64 ocfs2_backup_super_blkno(struct super_block *sb, int index)
		{
		u64 offset = OCFS2_BACKUP_SB_START;

		if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) {
		offset <<= (2 * index);
		offset /= sb->s_blocksize;
		return offset;
		}

		return 0;

		}
		#else
		static inline int ocfs2_fast_symlink_chars(int blocksize)
		{
		@@ -631,6 +659,19 @@ static inline int ocfs2_truncate_recs_per_inode(int blocksize)

		return size / sizeof(struct ocfs2_truncate_rec);
		}

		static inline uint64_t ocfs2_backup_super_blkno(int blocksize, int index)
		{
		uint64_t offset = OCFS2_BACKUP_SB_START;

		if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) {
		offset <<= (2 * index);
		offset /= blocksize;
		return offset;
		}

		return 0;
		}
		#endif /* __KERNEL__ */