blk-core: use BIO list management functions

Now that the bio list management stuff is generic, convert
generic_make_request to use bio lists instead of its own private bio
list implementation.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

diff --git a/block/blk-core.c b/block/blk-core.c
index 718897e..44b6d69 100644 (file)
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1490,9 +1490,9 @@ end_io:
 /*
  * We only want one ->make_request_fn to be active at a time,
  * else stack usage with stacked devices could be a problem.
- * So use current->bio_{list,tail} to keep a list of requests
+ * So use current->bio_list to keep a list of requests
  * submited by a make_request_fn function.
- * current->bio_tail is also used as a flag to say if
+ * current->bio_list is also used as a flag to say if
  * generic_make_request is currently active in this task or not.
  * If it is NULL, then no make_request is active.  If it is non-NULL,
  * then a make_request is active, and new requests should be added
@@ -1500,11 +1500,11 @@ end_io:
  */
 void generic_make_request(struct bio *bio)
 {
-       if (current->bio_tail) {
+       struct bio_list bio_list_on_stack;
+
+       if (current->bio_list) {
                /* make_request is active */
-               *(current->bio_tail) = bio;
-               bio->bi_next = NULL;
-               current->bio_tail = &bio->bi_next;
+               bio_list_add(current->bio_list, bio);
                return;
        }
        /* following loop may be a bit non-obvious, and so deserves some
@@ -1512,30 +1512,27 @@ void generic_make_request(struct bio *bio)
         * Before entering the loop, bio->bi_next is NULL (as all callers
         * ensure that) so we have a list with a single bio.
         * We pretend that we have just taken it off a longer list, so
-        * we assign bio_list to the next (which is NULL) and bio_tail
-        * to &bio_list, thus initialising the bio_list of new bios to be
+        * we assign bio_list to a pointer to the bio_list_on_stack,
+        * thus initialising the bio_list of new bios to be
         * added.  __generic_make_request may indeed add some more bios
         * through a recursive call to generic_make_request.  If it
         * did, we find a non-NULL value in bio_list and re-enter the loop
         * from the top.  In this case we really did just take the bio
-        * of the top of the list (no pretending) and so fixup bio_list and
-        * bio_tail or bi_next, and call into __generic_make_request again.
+        * of the top of the list (no pretending) and so remove it from
+        * bio_list, and call into __generic_make_request again.
         *
         * The loop was structured like this to make only one call to
         * __generic_make_request (which is important as it is large and
         * inlined) and to keep the structure simple.
         */
        BUG_ON(bio->bi_next);
+       bio_list_init(&bio_list_on_stack);
+       current->bio_list = &bio_list_on_stack;
        do {
-               current->bio_list = bio->bi_next;
-               if (bio->bi_next == NULL)
-                       current->bio_tail = &current->bio_list;
-               else
-                       bio->bi_next = NULL;
                __generic_make_request(bio);
-               bio = current->bio_list;
+               bio = bio_list_pop(current->bio_list);
        } while (bio);
-       current->bio_tail = NULL; /* deactivate */
+       current->bio_list = NULL; /* deactivate */
 }
 EXPORT_SYMBOL(generic_make_request);
 

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 78efe7c..7eb8297 100644 (file)
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -97,7 +97,7 @@ struct sched_param {
 struct exec_domain;
 struct futex_pi_state;
 struct robust_list_head;
-struct bio;
+struct bio_list;
 struct fs_struct;
 struct bts_context;
 struct perf_event_context;
@@ -1466,7 +1466,7 @@ struct task_struct {
        void *journal_info;
 
 /* stacked block device info */
-       struct bio *bio_list, **bio_tail;
+       struct bio_list *bio_list;
 
 /* VM state */
        struct reclaim_state *reclaim_state;