X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=block%2Fll_rw_blk.c;h=83425fb3c8dba6e2b62122aaa6a02a25d2436ab4;hb=d207ac0f7c9736782bfa51cff2109b74d26c3622;hp=346be9ae31f659174051b399ac1c47be147ad4e6;hpb=dc72ef4ae35c2016fb594bcc85ce871376682174;p=linux-2.6-omap-h63xx.git

diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index 346be9ae31f..83425fb3c8d 100644
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -1171,11 +1171,16 @@ int blk_queue_start_tag(request_queue_t *q, struct request *rq)
 		BUG();
 	}
 
-	tag = find_first_zero_bit(bqt->tag_map, bqt->max_depth);
-	if (tag >= bqt->max_depth)
-		return 1;
+	/*
+	 * Protect against shared tag maps, as we may not have exclusive
+	 * access to the tag map.
+	 */
+	do {
+		tag = find_first_zero_bit(bqt->tag_map, bqt->max_depth);
+		if (tag >= bqt->max_depth)
+			return 1;
 
-	__set_bit(tag, bqt->tag_map);
+	} while (test_and_set_bit(tag, bqt->tag_map));
 
 	rq->cmd_flags |= REQ_QUEUED;
 	rq->tag = tag;
@@ -2884,6 +2889,8 @@ static void init_request_from_bio(struct request *req, struct bio *bio)
 
 	if (bio_sync(bio))
 		req->cmd_flags |= REQ_RW_SYNC;
+	if (bio_rw_meta(bio))
+		req->cmd_flags |= REQ_RW_META;
 
 	req->errors = 0;
 	req->hard_sector = req->sector = bio->bi_sector;
@@ -3627,25 +3634,22 @@ EXPORT_SYMBOL(put_io_context);
 /* Called by the exitting task */
 void exit_io_context(void)
 {
-	unsigned long flags;
 	struct io_context *ioc;
 	struct cfq_io_context *cic;
 
-	local_irq_save(flags);
 	task_lock(current);
 	ioc = current->io_context;
 	current->io_context = NULL;
-	ioc->task = NULL;
 	task_unlock(current);
-	local_irq_restore(flags);
 
+	ioc->task = NULL;
 	if (ioc->aic && ioc->aic->exit)
 		ioc->aic->exit(ioc->aic);
 	if (ioc->cic_root.rb_node != NULL) {
 		cic = rb_entry(rb_first(&ioc->cic_root), struct cfq_io_context, rb_node);
 		cic->exit(ioc);
 	}
- 
+
 	put_io_context(ioc);
 }
 
@@ -3806,9 +3810,6 @@ queue_ra_store(struct request_queue *q, const char *page, size_t count)
 	ssize_t ret = queue_var_store(&ra_kb, page, count);
 
 	spin_lock_irq(q->queue_lock);
-	if (ra_kb > (q->max_sectors >> 1))
-		ra_kb = (q->max_sectors >> 1);
-
 	q->backing_dev_info.ra_pages = ra_kb >> (PAGE_CACHE_SHIFT - 10);
 	spin_unlock_irq(q->queue_lock);