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Diffstat (limited to 'include/linux/blkdev.h')
-rw-r--r--include/linux/blkdev.h82
1 files changed, 57 insertions, 25 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index a0ce8c585165..15db0f112d0a 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -207,6 +207,7 @@ enum rq_flag_bits {
__REQ_SORTED, /* elevator knows about this request */
__REQ_SOFTBARRIER, /* may not be passed by ioscheduler */
__REQ_HARDBARRIER, /* may not be passed by drive either */
+ __REQ_FUA, /* forced unit access */
__REQ_CMD, /* is a regular fs rw request */
__REQ_NOMERGE, /* don't touch this for merging */
__REQ_STARTED, /* drive already may have started this one */
@@ -230,9 +231,7 @@ enum rq_flag_bits {
__REQ_PM_SUSPEND, /* suspend request */
__REQ_PM_RESUME, /* resume request */
__REQ_PM_SHUTDOWN, /* shutdown request */
- __REQ_BAR_PREFLUSH, /* barrier pre-flush done */
- __REQ_BAR_POSTFLUSH, /* barrier post-flush */
- __REQ_BAR_FLUSH, /* rq is the flush request */
+ __REQ_ORDERED_COLOR, /* is before or after barrier */
__REQ_NR_BITS, /* stops here */
};
@@ -241,6 +240,7 @@ enum rq_flag_bits {
#define REQ_SORTED (1 << __REQ_SORTED)
#define REQ_SOFTBARRIER (1 << __REQ_SOFTBARRIER)
#define REQ_HARDBARRIER (1 << __REQ_HARDBARRIER)
+#define REQ_FUA (1 << __REQ_FUA)
#define REQ_CMD (1 << __REQ_CMD)
#define REQ_NOMERGE (1 << __REQ_NOMERGE)
#define REQ_STARTED (1 << __REQ_STARTED)
@@ -260,9 +260,7 @@ enum rq_flag_bits {
#define REQ_PM_SUSPEND (1 << __REQ_PM_SUSPEND)
#define REQ_PM_RESUME (1 << __REQ_PM_RESUME)
#define REQ_PM_SHUTDOWN (1 << __REQ_PM_SHUTDOWN)
-#define REQ_BAR_PREFLUSH (1 << __REQ_BAR_PREFLUSH)
-#define REQ_BAR_POSTFLUSH (1 << __REQ_BAR_POSTFLUSH)
-#define REQ_BAR_FLUSH (1 << __REQ_BAR_FLUSH)
+#define REQ_ORDERED_COLOR (1 << __REQ_ORDERED_COLOR)
/*
* State information carried for REQ_PM_SUSPEND and REQ_PM_RESUME
@@ -292,8 +290,7 @@ struct bio_vec;
typedef int (merge_bvec_fn) (request_queue_t *, struct bio *, struct bio_vec *);
typedef void (activity_fn) (void *data, int rw);
typedef int (issue_flush_fn) (request_queue_t *, struct gendisk *, sector_t *);
-typedef int (prepare_flush_fn) (request_queue_t *, struct request *);
-typedef void (end_flush_fn) (request_queue_t *, struct request *);
+typedef void (prepare_flush_fn) (request_queue_t *, struct request *);
enum blk_queue_state {
Queue_down,
@@ -335,7 +332,6 @@ struct request_queue
activity_fn *activity_fn;
issue_flush_fn *issue_flush_fn;
prepare_flush_fn *prepare_flush_fn;
- end_flush_fn *end_flush_fn;
/*
* Dispatch queue sorting
@@ -420,14 +416,11 @@ struct request_queue
/*
* reserved for flush operations
*/
- struct request *flush_rq;
- unsigned char ordered;
-};
-
-enum {
- QUEUE_ORDERED_NONE,
- QUEUE_ORDERED_TAG,
- QUEUE_ORDERED_FLUSH,
+ unsigned int ordered, next_ordered, ordseq;
+ int orderr, ordcolor;
+ struct request pre_flush_rq, bar_rq, post_flush_rq;
+ struct request *orig_bar_rq;
+ unsigned int bi_size;
};
#define RQ_INACTIVE (-1)
@@ -445,12 +438,51 @@ enum {
#define QUEUE_FLAG_REENTER 6 /* Re-entrancy avoidance */
#define QUEUE_FLAG_PLUGGED 7 /* queue is plugged */
#define QUEUE_FLAG_ELVSWITCH 8 /* don't use elevator, just do FIFO */
-#define QUEUE_FLAG_FLUSH 9 /* doing barrier flush sequence */
+
+enum {
+ /*
+ * Hardbarrier is supported with one of the following methods.
+ *
+ * NONE : hardbarrier unsupported
+ * DRAIN : ordering by draining is enough
+ * DRAIN_FLUSH : ordering by draining w/ pre and post flushes
+ * DRAIN_FUA : ordering by draining w/ pre flush and FUA write
+ * TAG : ordering by tag is enough
+ * TAG_FLUSH : ordering by tag w/ pre and post flushes
+ * TAG_FUA : ordering by tag w/ pre flush and FUA write
+ */
+ QUEUE_ORDERED_NONE = 0x00,
+ QUEUE_ORDERED_DRAIN = 0x01,
+ QUEUE_ORDERED_TAG = 0x02,
+
+ QUEUE_ORDERED_PREFLUSH = 0x10,
+ QUEUE_ORDERED_POSTFLUSH = 0x20,
+ QUEUE_ORDERED_FUA = 0x40,
+
+ QUEUE_ORDERED_DRAIN_FLUSH = QUEUE_ORDERED_DRAIN |
+ QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_POSTFLUSH,
+ QUEUE_ORDERED_DRAIN_FUA = QUEUE_ORDERED_DRAIN |
+ QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_FUA,
+ QUEUE_ORDERED_TAG_FLUSH = QUEUE_ORDERED_TAG |
+ QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_POSTFLUSH,
+ QUEUE_ORDERED_TAG_FUA = QUEUE_ORDERED_TAG |
+ QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_FUA,
+
+ /*
+ * Ordered operation sequence
+ */
+ QUEUE_ORDSEQ_STARTED = 0x01, /* flushing in progress */
+ QUEUE_ORDSEQ_DRAIN = 0x02, /* waiting for the queue to be drained */
+ QUEUE_ORDSEQ_PREFLUSH = 0x04, /* pre-flushing in progress */
+ QUEUE_ORDSEQ_BAR = 0x08, /* original barrier req in progress */
+ QUEUE_ORDSEQ_POSTFLUSH = 0x10, /* post-flushing in progress */
+ QUEUE_ORDSEQ_DONE = 0x20,
+};
#define blk_queue_plugged(q) test_bit(QUEUE_FLAG_PLUGGED, &(q)->queue_flags)
#define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
#define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
-#define blk_queue_flushing(q) test_bit(QUEUE_FLAG_FLUSH, &(q)->queue_flags)
+#define blk_queue_flushing(q) ((q)->ordseq)
#define blk_fs_request(rq) ((rq)->flags & REQ_CMD)
#define blk_pc_request(rq) ((rq)->flags & REQ_BLOCK_PC)
@@ -466,8 +498,7 @@ enum {
#define blk_sorted_rq(rq) ((rq)->flags & REQ_SORTED)
#define blk_barrier_rq(rq) ((rq)->flags & REQ_HARDBARRIER)
-#define blk_barrier_preflush(rq) ((rq)->flags & REQ_BAR_PREFLUSH)
-#define blk_barrier_postflush(rq) ((rq)->flags & REQ_BAR_POSTFLUSH)
+#define blk_fua_rq(rq) ((rq)->flags & REQ_FUA)
#define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
@@ -665,11 +696,12 @@ extern void blk_queue_prep_rq(request_queue_t *, prep_rq_fn *pfn);
extern void blk_queue_merge_bvec(request_queue_t *, merge_bvec_fn *);
extern void blk_queue_dma_alignment(request_queue_t *, int);
extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev);
-extern void blk_queue_ordered(request_queue_t *, int);
+extern int blk_queue_ordered(request_queue_t *, unsigned, prepare_flush_fn *);
extern void blk_queue_issue_flush_fn(request_queue_t *, issue_flush_fn *);
-extern struct request *blk_start_pre_flush(request_queue_t *,struct request *);
-extern int blk_complete_barrier_rq(request_queue_t *, struct request *, int);
-extern int blk_complete_barrier_rq_locked(request_queue_t *, struct request *, int);
+extern int blk_do_ordered(request_queue_t *, struct request **);
+extern unsigned blk_ordered_cur_seq(request_queue_t *);
+extern unsigned blk_ordered_req_seq(struct request *);
+extern void blk_ordered_complete_seq(request_queue_t *, unsigned, int);
extern int blk_rq_map_sg(request_queue_t *, struct request *, struct scatterlist *);
extern void blk_dump_rq_flags(struct request *, char *);
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-09 05:55:56 +0000