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Commit c8a09ff8 authored by Dave Chinner's avatar Dave Chinner Committed by Dave Chinner
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xfs: convert log grant heads to atomic variables 



Convert the log grant heads to atomic64_t types in preparation for
converting the accounting algorithms to atomic operations. his patch
just converts the variables; the algorithmic changes are in a
separate patch for clarity.

Signed-off-by: default avatarDave Chinner <dchinner@redhat.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
parent 1c3cb9ec

fs/xfs/xfs_log.c

+4 −4
Original line number Diff line number Diff line
@@ -47,7 +47,7 @@ STATIC xlog_t * xlog_alloc_log(xfs_mount_t *mp, 
				xfs_buftarg_t	*log_target,

				xfs_daddr_t	blk_offset,

				int		num_bblks);

STATIC int	 xlog_space_left(struct log *log, int64_t *head);

STATIC int	 xlog_space_left(struct log *log, atomic64_t *head);

STATIC int	 xlog_sync(xlog_t *log, xlog_in_core_t *iclog);

STATIC void	 xlog_dealloc_log(xlog_t *log);
@@ -100,7 +100,7 @@ STATIC int xlog_iclogs_empty(xlog_t *log); 
static void

xlog_grant_sub_space(

	struct log	*log,

	int64_t		*head,

	atomic64_t	*head,

	int		bytes)

{

	int		cycle, space;
@@ -119,7 +119,7 @@ xlog_grant_sub_space( 
static void

xlog_grant_add_space(

	struct log	*log,

	int64_t		*head,

	atomic64_t	*head,

	int		bytes)

{

	int		tmp;
@@ -816,7 +816,7 @@ xlog_assign_tail_lsn( 
STATIC int

xlog_space_left(

	struct log	*log,

	int64_t		*head)

	atomic64_t	*head)

{

	int		free_bytes;

	int		tail_bytes;

fs/xfs/xfs_log_priv.h

+6 −6
Original line number Diff line number Diff line
@@ -514,8 +514,8 @@ typedef struct log { 
	spinlock_t		l_grant_lock ____cacheline_aligned_in_smp;

	struct list_head	l_reserveq;

	struct list_head	l_writeq;

	int64_t			l_grant_reserve_head;

	int64_t			l_grant_write_head;

	atomic64_t			l_grant_reserve_head;

	atomic64_t			l_grant_write_head;



	/*

	 * l_last_sync_lsn and l_tail_lsn are atomics so they can be set and
@@ -596,18 +596,18 @@ xlog_assign_atomic_lsn(atomic64_t *lsn, uint cycle, uint block) 
 * will always get consistent component values to work from.

 */

static inline void

xlog_crack_grant_head(int64_t *head, int *cycle, int *space)

xlog_crack_grant_head(atomic64_t *head, int *cycle, int *space)

{

	int64_t	val = *head;

	int64_t	val = atomic64_read(head);



	*cycle = val >> 32;

	*space = val & 0xffffffff;

}



static inline void

xlog_assign_grant_head(int64_t *head, int cycle, int space)

xlog_assign_grant_head(atomic64_t *head, int cycle, int space)

{

	*head = ((int64_t)cycle << 32) | space;

	atomic64_set(head, ((int64_t)cycle << 32) | space);

}



/*