[XFS] add generic btree types (de227dd9) · Commits · e / devices / android_kernel_xiaomi_markw

Add generic union types for btree pointers, keys and records. The generic btree pointer contains either a 32 and 64bit big endian scalar for short and long form btrees, and the key and record contain the relevant type for each possible btree. Split out from a bigger patch from Dave Chinner and simplified a little further. SGI-PV: 985583 SGI-Modid: xfs-linux-melb:xfs-kern:32178a Signed-off-by:

Christoph Hellwig <hch@infradead.org> Signed-off-by:

Lachlan McIlroy <lachlan@sgi.com> Signed-off-by:

Bill O'Donnell <billodo@sgi.com> Signed-off-by:

David Chinner <david@fromorbit.com>

fs/xfs/xfs_btree.h

+25 −0

Original line number	Diff line number	Diff line
		@@ -79,6 +79,31 @@ typedef struct xfs_btree_block {
		} bb_u; /* rest */
		} xfs_btree_block_t;

		/*
		* Generic key, ptr and record wrapper structures.
		*
		* These are disk format structures, and are converted where necessary
		* by the btree specific code that needs to interpret them.
		*/
		union xfs_btree_ptr {
		__be32 s; /* short form ptr */
		__be64 l; /* long form ptr */
		};

		union xfs_btree_key {
		xfs_bmbt_key_t bmbt;
		xfs_bmdr_key_t bmbr; /* bmbt root block */
		xfs_alloc_key_t alloc;
		xfs_inobt_key_t inobt;
		};

		union xfs_btree_rec {
		xfs_bmbt_rec_t bmbt;
		xfs_bmdr_rec_t bmbr; /* bmbt root block */
		xfs_alloc_rec_t alloc;
		xfs_inobt_rec_t inobt;
		};

		/*
		* For logging record fields.
		*/