diff options
Diffstat (limited to 'include/linux/blkdev.h')
| -rw-r--r-- | include/linux/blkdev.h | 27 |
1 files changed, 18 insertions, 9 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 1a23722e887..0e67c45b3bc 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -73,7 +73,7 @@ enum rq_cmd_type_bits { /* * try to put the fields that are referenced together in the same cacheline. - * if you modify this structure, be sure to check block/blk-core.c:rq_init() + * if you modify this structure, be sure to check block/blk-core.c:blk_rq_init() * as well! */ struct request { @@ -260,8 +260,7 @@ struct queue_limits { unsigned char discard_zeroes_data; }; -struct request_queue -{ +struct request_queue { /* * Together with queue_head for cacheline sharing */ @@ -304,14 +303,14 @@ struct request_queue void *queuedata; /* - * queue needs bounce pages for pages above this limit + * various queue flags, see QUEUE_* below */ - gfp_t bounce_gfp; + unsigned long queue_flags; /* - * various queue flags, see QUEUE_* below + * queue needs bounce pages for pages above this limit */ - unsigned long queue_flags; + gfp_t bounce_gfp; /* * protects queue structures from reentrancy. ->__queue_lock should @@ -334,8 +333,8 @@ struct request_queue unsigned int nr_congestion_off; unsigned int nr_batching; - void *dma_drain_buffer; unsigned int dma_drain_size; + void *dma_drain_buffer; unsigned int dma_pad_mask; unsigned int dma_alignment; @@ -393,7 +392,7 @@ struct request_queue #define QUEUE_FLAG_ELVSWITCH 6 /* don't use elevator, just do FIFO */ #define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */ #define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */ -#define QUEUE_FLAG_SAME_COMP 9 /* force complete on same CPU */ +#define QUEUE_FLAG_SAME_COMP 9 /* complete on same CPU-group */ #define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */ #define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */ #define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */ @@ -403,6 +402,7 @@ struct request_queue #define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */ #define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */ #define QUEUE_FLAG_SECDISCARD 17 /* supports SECDISCARD */ +#define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same CPU */ #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ (1 << QUEUE_FLAG_STACKABLE) | \ @@ -857,12 +857,21 @@ struct request_queue *blk_alloc_queue(gfp_t); struct request_queue *blk_alloc_queue_node(gfp_t, int); extern void blk_put_queue(struct request_queue *); +/* + * Note: Code in between changing the blk_plug list/cb_list or element of such + * lists is preemptable, but such code can't do sleep (or be very careful), + * otherwise data is corrupted. For details, please check schedule() where + * blk_schedule_flush_plug() is called. + */ struct blk_plug { unsigned long magic; struct list_head list; struct list_head cb_list; unsigned int should_sort; + unsigned int count; }; +#define BLK_MAX_REQUEST_COUNT 16 + struct blk_plug_cb { struct list_head list; void (*callback)(struct blk_plug_cb *); |