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Commit 3f336c6f authored by Dave Chinner's avatar Dave Chinner Committed by Dave Chinner
Browse files

xfs: fact out common grant head/log tail verification code 



Factor repeated debug code out of grant head manipulation functions into a
separate function. This removes ifdef DEBUG spagetti from the code and makes
the code easier to follow.

Signed-off-by: default avatarDave Chinner <dchinner@redhat.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
parent 10547941

fs/xfs/xfs_log.c

+22 −29
Original line number Diff line number Diff line
@@ -82,6 +82,7 @@ STATIC void xlog_ungrant_log_space(xlog_t *log, 
#if defined(DEBUG)

STATIC void	xlog_verify_dest_ptr(xlog_t *log, char *ptr);

STATIC void	xlog_verify_grant_head(xlog_t *log, int equals);

STATIC void	xlog_verify_grant_tail(struct log *log);

STATIC void	xlog_verify_iclog(xlog_t *log, xlog_in_core_t *iclog,

				  int count, boolean_t syncing);

STATIC void	xlog_verify_tail_lsn(xlog_t *log, xlog_in_core_t *iclog,
@@ -89,6 +90,7 @@ STATIC void xlog_verify_tail_lsn(xlog_t *log, xlog_in_core_t *iclog, 
#else

#define xlog_verify_dest_ptr(a,b)

#define xlog_verify_grant_head(a,b)

#define xlog_verify_grant_tail(a)

#define xlog_verify_iclog(a,b,c,d)

#define xlog_verify_tail_lsn(a,b,c)

#endif
@@ -2503,10 +2505,6 @@ xlog_grant_log_space(xlog_t *log, 
{

	int		 free_bytes;

	int		 need_bytes;

#ifdef DEBUG

	xfs_lsn_t	 tail_lsn;

#endif





#ifdef DEBUG

	if (log->l_flags & XLOG_ACTIVE_RECOVERY)
@@ -2577,21 +2575,9 @@ xlog_grant_log_space(xlog_t *log, 


	/* we've got enough space */

	xlog_grant_add_space(log, need_bytes);

#ifdef DEBUG

	tail_lsn = log->l_tail_lsn;

	/*

	 * Check to make sure the grant write head didn't just over lap the

	 * tail.  If the cycles are the same, we can't be overlapping.

	 * Otherwise, make sure that the cycles differ by exactly one and

	 * check the byte count.

	 */

	if (CYCLE_LSN(tail_lsn) != log->l_grant_write_cycle) {

		ASSERT(log->l_grant_write_cycle-1 == CYCLE_LSN(tail_lsn));

		ASSERT(log->l_grant_write_bytes <= BBTOB(BLOCK_LSN(tail_lsn)));

	}

#endif

	trace_xfs_log_grant_exit(log, tic);

	xlog_verify_grant_head(log, 1);

	xlog_verify_grant_tail(log);

	spin_unlock(&log->l_grant_lock);

	return 0;
@@ -2621,9 +2607,6 @@ xlog_regrant_write_log_space(xlog_t *log, 
			     xlog_ticket_t *tic)

{

	int		free_bytes, need_bytes;

#ifdef DEBUG

	xfs_lsn_t	tail_lsn;

#endif



	tic->t_curr_res = tic->t_unit_res;

	xlog_tic_reset_res(tic);
@@ -2719,17 +2702,9 @@ xlog_regrant_write_log_space(xlog_t *log, 


	/* we've got enough space */

	xlog_grant_add_space_write(log, need_bytes);

#ifdef DEBUG

	tail_lsn = log->l_tail_lsn;

	if (CYCLE_LSN(tail_lsn) != log->l_grant_write_cycle) {

		ASSERT(log->l_grant_write_cycle-1 == CYCLE_LSN(tail_lsn));

		ASSERT(log->l_grant_write_bytes <= BBTOB(BLOCK_LSN(tail_lsn)));

	}

#endif



	trace_xfs_log_regrant_write_exit(log, tic);



	xlog_verify_grant_head(log, 1);

	xlog_verify_grant_tail(log);

	spin_unlock(&log->l_grant_lock);

	return 0;
@@ -3465,6 +3440,24 @@ xlog_verify_grant_head(xlog_t *log, int equals) 
    }

}	/* xlog_verify_grant_head */



STATIC void

xlog_verify_grant_tail(

	struct log	*log)

{

	xfs_lsn_t	tail_lsn = log->l_tail_lsn;



	/*

	 * Check to make sure the grant write head didn't just over lap the

	 * tail.  If the cycles are the same, we can't be overlapping.

	 * Otherwise, make sure that the cycles differ by exactly one and

	 * check the byte count.

	 */

	if (CYCLE_LSN(tail_lsn) != log->l_grant_write_cycle) {

		ASSERT(log->l_grant_write_cycle - 1 == CYCLE_LSN(tail_lsn));

		ASSERT(log->l_grant_write_bytes <= BBTOB(BLOCK_LSN(tail_lsn)));

	}

}



/* check if it will fit */

STATIC void

xlog_verify_tail_lsn(xlog_t	    *log,