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: Mike Snitzer <snitzer@redhat.com> Acked-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
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@ -61,11 +61,11 @@ struct multipath {
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struct list_head list;
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struct dm_target *ti;
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spinlock_t lock;
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const char *hw_handler_name;
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char *hw_handler_params;
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spinlock_t lock;
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unsigned nr_priority_groups;
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struct list_head priority_groups;
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@ -81,16 +81,17 @@ struct multipath {
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struct priority_group *next_pg; /* Switch to this PG if set */
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unsigned repeat_count; /* I/Os left before calling PS again */
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unsigned queue_io; /* Must we queue all I/O? */
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unsigned queue_if_no_path; /* Queue I/O if last path fails? */
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unsigned saved_queue_if_no_path;/* Saved state during suspension */
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unsigned queue_io:1; /* Must we queue all I/O? */
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unsigned queue_if_no_path:1; /* Queue I/O if last path fails? */
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unsigned saved_queue_if_no_path:1; /* Saved state during suspension */
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unsigned pg_init_retries; /* Number of times to retry pg_init */
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unsigned pg_init_count; /* Number of times pg_init called */
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unsigned pg_init_delay_msecs; /* Number of msecs before pg_init retry */
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unsigned queue_size;
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struct work_struct process_queued_ios;
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struct list_head queued_ios;
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unsigned queue_size;
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struct work_struct trigger_event;
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