floppy: remove dead/commented out code from floppy driver

[cascardo/linux.git] / block / ll_rw_blk.c

diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index 4df7d02..524404b 100644 (file)
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -30,6 +30,7 @@
 #include <linux/cpu.h>
 #include <linux/blktrace_api.h>
 #include <linux/fault-inject.h>
+#include <linux/scatterlist.h>
 
 /*
  * for max sense size
@@ -1318,9 +1319,10 @@ static int blk_hw_contig_segment(struct request_queue *q, struct bio *bio,
  * must make sure sg can hold rq->nr_phys_segments entries
  */
 int blk_rq_map_sg(struct request_queue *q, struct request *rq,
-                 struct scatterlist *sg)
+                 struct scatterlist *sglist)
 {
        struct bio_vec *bvec, *bvprv;
+       struct scatterlist *next_sg, *sg;
        struct req_iterator iter;
        int nsegs, cluster;
 
@@ -1331,11 +1333,12 @@ int blk_rq_map_sg(struct request_queue *q, struct request *rq,
         * for each bio in rq
         */
        bvprv = NULL;
+       sg = next_sg = &sglist[0];
        rq_for_each_segment(bvec, rq, iter) {
                int nbytes = bvec->bv_len;
 
                if (bvprv && cluster) {
-                       if (sg[nsegs - 1].length + nbytes > q->max_segment_size)
+                       if (sg->length + nbytes > q->max_segment_size)
                                goto new_segment;
 
                        if (!BIOVEC_PHYS_MERGEABLE(bvprv, bvec))
@@ -1343,14 +1346,15 @@ int blk_rq_map_sg(struct request_queue *q, struct request *rq,
                        if (!BIOVEC_SEG_BOUNDARY(q, bvprv, bvec))
                                goto new_segment;
 
-                       sg[nsegs - 1].length += nbytes;
+                       sg->length += nbytes;
                } else {
 new_segment:
-                       memset(&sg[nsegs],0,sizeof(struct scatterlist));
-                       sg[nsegs].page = bvec->bv_page;
-                       sg[nsegs].length = nbytes;
-                       sg[nsegs].offset = bvec->bv_offset;
+                       sg = next_sg;
+                       next_sg = sg_next(sg);
 
+                       sg->page = bvec->bv_page;
+                       sg->length = nbytes;
+                       sg->offset = bvec->bv_offset;
                        nsegs++;
                }
                bvprv = bvec;
@@ -1782,6 +1786,7 @@ static void blk_release_queue(struct kobject *kobj)
 
        blk_trace_shutdown(q);
 
+       bdi_destroy(&q->backing_dev_info);
        kmem_cache_free(requestq_cachep, q);
 }
 
@@ -1835,21 +1840,27 @@ static struct kobj_type queue_ktype;
 struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id)
 {
        struct request_queue *q;
+       int err;
 
        q = kmem_cache_alloc_node(requestq_cachep,
                                gfp_mask | __GFP_ZERO, node_id);
        if (!q)
                return NULL;
 
+       q->backing_dev_info.unplug_io_fn = blk_backing_dev_unplug;
+       q->backing_dev_info.unplug_io_data = q;
+       err = bdi_init(&q->backing_dev_info);
+       if (err) {
+               kmem_cache_free(requestq_cachep, q);
+               return NULL;
+       }
+
        init_timer(&q->unplug_timer);
 
        kobject_set_name(&q->kobj, "%s", "queue");
        q->kobj.ktype = &queue_ktype;
        kobject_init(&q->kobj);
 
-       q->backing_dev_info.unplug_io_fn = blk_backing_dev_unplug;
-       q->backing_dev_info.unplug_io_data = q;
-
        mutex_init(&q->sysfs_lock);
 
        return q;
@@ -4038,7 +4049,6 @@ queue_max_sectors_store(struct request_queue *q, const char *page, size_t count)
                        max_hw_sectors_kb = q->max_hw_sectors >> 1,
                        page_kb = 1 << (PAGE_CACHE_SHIFT - 10);
        ssize_t ret = queue_var_store(&max_sectors_kb, page, count);
-       int ra_kb;
 
        if (max_sectors_kb > max_hw_sectors_kb || max_sectors_kb < page_kb)
                return -EINVAL;
@@ -4047,14 +4057,6 @@ queue_max_sectors_store(struct request_queue *q, const char *page, size_t count)
         * values synchronously:
         */
        spin_lock_irq(q->queue_lock);
-       /*
-        * Trim readahead window as well, if necessary:
-        */
-       ra_kb = q->backing_dev_info.ra_pages << (PAGE_CACHE_SHIFT - 10);
-       if (ra_kb > max_sectors_kb)
-               q->backing_dev_info.ra_pages =
-                               max_sectors_kb >> (PAGE_CACHE_SHIFT - 10);
-
        q->max_sectors = max_sectors_kb << 1;
        spin_unlock_irq(q->queue_lock);
 
@@ -4068,7 +4070,23 @@ static ssize_t queue_max_hw_sectors_show(struct request_queue *q, char *page)
        return queue_var_show(max_hw_sectors_kb, (page));
 }
 
+static ssize_t queue_max_segments_show(struct request_queue *q, char *page)
+{
+       return queue_var_show(q->max_phys_segments, page);
+}
+
+static ssize_t queue_max_segments_store(struct request_queue *q,
+                                       const char *page, size_t count)
+{
+       unsigned long segments;
+       ssize_t ret = queue_var_store(&segments, page, count);
 
+       spin_lock_irq(q->queue_lock);
+       q->max_phys_segments = segments;
+       spin_unlock_irq(q->queue_lock);
+
+       return ret;
+}
 static struct queue_sysfs_entry queue_requests_entry = {
        .attr = {.name = "nr_requests", .mode = S_IRUGO | S_IWUSR },
        .show = queue_requests_show,
@@ -4092,6 +4110,12 @@ static struct queue_sysfs_entry queue_max_hw_sectors_entry = {
        .show = queue_max_hw_sectors_show,
 };
 
+static struct queue_sysfs_entry queue_max_segments_entry = {
+       .attr = {.name = "max_segments", .mode = S_IRUGO | S_IWUSR },
+       .show = queue_max_segments_show,
+       .store = queue_max_segments_store,
+};
+
 static struct queue_sysfs_entry queue_iosched_entry = {
        .attr = {.name = "scheduler", .mode = S_IRUGO | S_IWUSR },
        .show = elv_iosched_show,
@@ -4103,6 +4127,7 @@ static struct attribute *default_attrs[] = {
        &queue_ra_entry.attr,
        &queue_max_hw_sectors_entry.attr,
        &queue_max_sectors_entry.attr,
+       &queue_max_segments_entry.attr,
        &queue_iosched_entry.attr,
        NULL,
 };