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Commit 1fbdd2b3 authored by Mike Snitzer's avatar Mike Snitzer Committed by Alasdair G Kergon
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dm mpath: reduce size of struct multipath 



Move multipath structure's 'lock' and 'queue_size' members to eliminate
two 4-byte holes.  Also use a bit within a single unsigned int for each
existing flag (saves 8-bytes).  This allows future flags to be added
without each consuming an unsigned int.

Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
Acked-by: default avatarHannes Reinecke <hare@suse.de>
Signed-off-by: default avatarAlasdair G Kergon <agk@redhat.com>
parent 76e10d15

drivers/md/dm-mpath.c

+7 −6
Original line number Diff line number Diff line
@@ -61,11 +61,11 @@ struct multipath { 
	struct list_head list;

	struct dm_target *ti;



	spinlock_t lock;



	const char *hw_handler_name;

	char *hw_handler_params;



	spinlock_t lock;



	unsigned nr_priority_groups;

	struct list_head priority_groups;
@@ -81,16 +81,17 @@ struct multipath { 
	struct priority_group *next_pg;	/* Switch to this PG if set */

	unsigned repeat_count;		/* I/Os left before calling PS again */



	unsigned queue_io;		/* Must we queue all I/O? */

	unsigned queue_if_no_path;	/* Queue I/O if last path fails? */

	unsigned saved_queue_if_no_path;/* Saved state during suspension */

	unsigned queue_io:1;		/* Must we queue all I/O? */

	unsigned queue_if_no_path:1;	/* Queue I/O if last path fails? */

	unsigned saved_queue_if_no_path:1; /* Saved state during suspension */



	unsigned pg_init_retries;	/* Number of times to retry pg_init */

	unsigned pg_init_count;		/* Number of times pg_init called */

	unsigned pg_init_delay_msecs;	/* Number of msecs before pg_init retry */



	unsigned queue_size;

	struct work_struct process_queued_ios;

	struct list_head queued_ios;

	unsigned queue_size;



	struct work_struct trigger_event;