Merge branch 'for-linus' of git://git.o-hand.com/linux-rpurdie-backlight

[safe/jmp/linux-2.6] / block / elevator.c

diff --git a/block/elevator.c b/block/elevator.c
index ebee948..1975b61 100644 (file)
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -33,17 +33,16 @@
 #include <linux/compiler.h>
 #include <linux/delay.h>
 #include <linux/blktrace_api.h>
-#include <trace/block.h>
 #include <linux/hash.h>
 #include <linux/uaccess.h>
 
+#include <trace/events/block.h>
+
 #include "blk.h"
 
 static DEFINE_SPINLOCK(elv_list_lock);
 static LIST_HEAD(elv_list);
 
-DEFINE_TRACE(block_rq_abort);
-
 /*
  * Merge hash stuff.
  */
@@ -54,9 +53,6 @@ static const int elv_hash_shift = 6;
 #define ELV_HASH_ENTRIES       (1 << elv_hash_shift)
 #define rq_hash_key(rq)                (blk_rq_pos(rq) + blk_rq_sectors(rq))
 
-DEFINE_TRACE(block_rq_insert);
-DEFINE_TRACE(block_rq_issue);
-
 /*
  * Query io scheduler to see if the current process issuing bio may be
  * merged with rq.
@@ -83,7 +79,8 @@ int elv_rq_merge_ok(struct request *rq, struct bio *bio)
        /*
         * Don't merge file system requests and discard requests
         */
-       if (bio_discard(bio) != bio_discard(rq->bio))
+       if (bio_rw_flagged(bio, BIO_RW_DISCARD) !=
+           bio_rw_flagged(rq->bio, BIO_RW_DISCARD))
                return 0;
 
        /*
@@ -575,6 +572,9 @@ void elv_drain_elevator(struct request_queue *q)
  */
 void elv_quiesce_start(struct request_queue *q)
 {
+       if (!q->elevator)
+               return;
+
        queue_flag_set(QUEUE_FLAG_ELVSWITCH, q);
 
        /*
@@ -810,6 +810,11 @@ void elv_abort_queue(struct request_queue *q)
                rq = list_entry_rq(q->queue_head.next);
                rq->cmd_flags |= REQ_QUIET;
                trace_block_rq_abort(q, rq);
+               /*
+                * Mark this request as started so we don't trigger
+                * any debug logic in the end I/O path.
+                */
+               blk_start_request(rq);
                __blk_end_request_all(rq, -EIO);
        }
 }
@@ -1050,6 +1055,9 @@ ssize_t elv_iosched_store(struct request_queue *q, const char *name,
        char elevator_name[ELV_NAME_MAX];
        struct elevator_type *e;
 
+       if (!q->elevator)
+               return count;
+
        strlcpy(elevator_name, name, sizeof(elevator_name));
        strstrip(elevator_name);
 
@@ -1073,10 +1081,15 @@ ssize_t elv_iosched_store(struct request_queue *q, const char *name,
 ssize_t elv_iosched_show(struct request_queue *q, char *name)
 {
        struct elevator_queue *e = q->elevator;
-       struct elevator_type *elv = e->elevator_type;
+       struct elevator_type *elv;
        struct elevator_type *__e;
        int len = 0;
 
+       if (!q->elevator)
+               return sprintf(name, "none\n");
+
+       elv = e->elevator_type;
+
        spin_lock(&elv_list_lock);
        list_for_each_entry(__e, &elv_list, list) {
                if (!strcmp(elv->elevator_name, __e->elevator_name))