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Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block
* 'for-linus' of git://git.kernel.dk/linux-2.6-block: xen/blkfront: use blk_rq_map_sg to generate ring entries block: reduce stack footprint of blk_recount_segments() cciss: shorten 30s timeout on controller reset block: add documentation for register_blkdev() block: fix bogus gcc warning for uninitialized var usage
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commit
babb29b0a3
@ -38,72 +38,84 @@ void blk_recalc_rq_sectors(struct request *rq, int nsect)
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}
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}
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void blk_recalc_rq_segments(struct request *rq)
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static unsigned int __blk_recalc_rq_segments(struct request_queue *q,
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struct bio *bio,
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unsigned int *seg_size_ptr)
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{
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int nr_phys_segs;
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unsigned int phys_size;
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struct bio_vec *bv, *bvprv = NULL;
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int seg_size;
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int cluster;
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struct req_iterator iter;
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int high, highprv = 1;
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struct request_queue *q = rq->q;
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int cluster, i, high, highprv = 1;
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unsigned int seg_size, nr_phys_segs;
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struct bio *fbio;
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if (!rq->bio)
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return;
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if (!bio)
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return 0;
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fbio = bio;
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cluster = test_bit(QUEUE_FLAG_CLUSTER, &q->queue_flags);
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seg_size = 0;
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phys_size = nr_phys_segs = 0;
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rq_for_each_segment(bv, rq, iter) {
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/*
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* the trick here is making sure that a high page is never
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* considered part of another segment, since that might
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* change with the bounce page.
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*/
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high = page_to_pfn(bv->bv_page) > q->bounce_pfn;
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if (high || highprv)
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goto new_segment;
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if (cluster) {
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if (seg_size + bv->bv_len > q->max_segment_size)
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goto new_segment;
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if (!BIOVEC_PHYS_MERGEABLE(bvprv, bv))
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goto new_segment;
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if (!BIOVEC_SEG_BOUNDARY(q, bvprv, bv))
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for_each_bio(bio) {
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bio_for_each_segment(bv, bio, i) {
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/*
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* the trick here is making sure that a high page is
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* never considered part of another segment, since that
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* might change with the bounce page.
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*/
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high = page_to_pfn(bv->bv_page) > q->bounce_pfn;
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if (high || highprv)
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goto new_segment;
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if (cluster) {
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if (seg_size + bv->bv_len > q->max_segment_size)
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goto new_segment;
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if (!BIOVEC_PHYS_MERGEABLE(bvprv, bv))
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goto new_segment;
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if (!BIOVEC_SEG_BOUNDARY(q, bvprv, bv))
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goto new_segment;
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seg_size += bv->bv_len;
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bvprv = bv;
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continue;
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}
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seg_size += bv->bv_len;
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bvprv = bv;
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continue;
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}
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new_segment:
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if (nr_phys_segs == 1 && seg_size > rq->bio->bi_seg_front_size)
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rq->bio->bi_seg_front_size = seg_size;
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if (nr_phys_segs == 1 && seg_size >
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fbio->bi_seg_front_size)
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fbio->bi_seg_front_size = seg_size;
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nr_phys_segs++;
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bvprv = bv;
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seg_size = bv->bv_len;
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highprv = high;
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nr_phys_segs++;
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bvprv = bv;
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seg_size = bv->bv_len;
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highprv = high;
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}
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}
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if (nr_phys_segs == 1 && seg_size > rq->bio->bi_seg_front_size)
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if (seg_size_ptr)
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*seg_size_ptr = seg_size;
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return nr_phys_segs;
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}
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void blk_recalc_rq_segments(struct request *rq)
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{
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unsigned int seg_size = 0, phys_segs;
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phys_segs = __blk_recalc_rq_segments(rq->q, rq->bio, &seg_size);
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if (phys_segs == 1 && seg_size > rq->bio->bi_seg_front_size)
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rq->bio->bi_seg_front_size = seg_size;
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if (seg_size > rq->biotail->bi_seg_back_size)
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rq->biotail->bi_seg_back_size = seg_size;
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rq->nr_phys_segments = nr_phys_segs;
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rq->nr_phys_segments = phys_segs;
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}
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void blk_recount_segments(struct request_queue *q, struct bio *bio)
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{
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struct request rq;
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struct bio *nxt = bio->bi_next;
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rq.q = q;
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rq.bio = rq.biotail = bio;
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bio->bi_next = NULL;
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blk_recalc_rq_segments(&rq);
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bio->bi_phys_segments = __blk_recalc_rq_segments(q, bio, NULL);
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bio->bi_next = nxt;
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bio->bi_phys_segments = rq.nr_phys_segments;
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bio->bi_flags |= (1 << BIO_SEG_VALID);
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}
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EXPORT_SYMBOL(blk_recount_segments);
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@ -256,6 +256,22 @@ void blkdev_show(struct seq_file *seqf, off_t offset)
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}
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#endif /* CONFIG_PROC_FS */
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/**
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* register_blkdev - register a new block device
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*
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* @major: the requested major device number [1..255]. If @major=0, try to
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* allocate any unused major number.
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* @name: the name of the new block device as a zero terminated string
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*
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* The @name must be unique within the system.
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*
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* The return value depends on the @major input parameter.
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* - if a major device number was requested in range [1..255] then the
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* function returns zero on success, or a negative error code
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* - if any unused major number was requested with @major=0 parameter
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* then the return value is the allocated major number in range
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* [1..255] or a negative error code otherwise
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*/
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int register_blkdev(unsigned int major, const char *name)
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{
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struct blk_major_name **n, *p;
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@ -3611,11 +3611,15 @@ static int __devinit cciss_init_one(struct pci_dev *pdev,
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schedule_timeout_uninterruptible(30*HZ);
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/* Now try to get the controller to respond to a no-op */
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for (i=0; i<12; i++) {
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for (i=0; i<30; i++) {
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if (cciss_noop(pdev) == 0)
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break;
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else
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printk("cciss: no-op failed%s\n", (i < 11 ? "; re-trying" : ""));
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schedule_timeout_uninterruptible(HZ);
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}
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if (i == 30) {
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printk(KERN_ERR "cciss: controller seems dead\n");
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return -EBUSY;
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}
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}
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@ -40,6 +40,7 @@
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#include <linux/hdreg.h>
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#include <linux/cdrom.h>
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#include <linux/module.h>
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#include <linux/scatterlist.h>
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#include <xen/xenbus.h>
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#include <xen/grant_table.h>
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@ -82,6 +83,7 @@ struct blkfront_info
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enum blkif_state connected;
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int ring_ref;
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struct blkif_front_ring ring;
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struct scatterlist sg[BLKIF_MAX_SEGMENTS_PER_REQUEST];
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unsigned int evtchn, irq;
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struct request_queue *rq;
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struct work_struct work;
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@ -204,12 +206,11 @@ static int blkif_queue_request(struct request *req)
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struct blkfront_info *info = req->rq_disk->private_data;
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unsigned long buffer_mfn;
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struct blkif_request *ring_req;
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struct req_iterator iter;
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struct bio_vec *bvec;
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unsigned long id;
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unsigned int fsect, lsect;
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int ref;
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int i, ref;
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grant_ref_t gref_head;
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struct scatterlist *sg;
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if (unlikely(info->connected != BLKIF_STATE_CONNECTED))
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return 1;
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@ -238,12 +239,13 @@ static int blkif_queue_request(struct request *req)
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if (blk_barrier_rq(req))
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ring_req->operation = BLKIF_OP_WRITE_BARRIER;
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ring_req->nr_segments = 0;
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rq_for_each_segment(bvec, req, iter) {
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BUG_ON(ring_req->nr_segments == BLKIF_MAX_SEGMENTS_PER_REQUEST);
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buffer_mfn = pfn_to_mfn(page_to_pfn(bvec->bv_page));
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fsect = bvec->bv_offset >> 9;
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lsect = fsect + (bvec->bv_len >> 9) - 1;
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ring_req->nr_segments = blk_rq_map_sg(req->q, req, info->sg);
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BUG_ON(ring_req->nr_segments > BLKIF_MAX_SEGMENTS_PER_REQUEST);
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for_each_sg(info->sg, sg, ring_req->nr_segments, i) {
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buffer_mfn = pfn_to_mfn(page_to_pfn(sg_page(sg)));
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fsect = sg->offset >> 9;
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lsect = fsect + (sg->length >> 9) - 1;
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/* install a grant reference. */
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ref = gnttab_claim_grant_reference(&gref_head);
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BUG_ON(ref == -ENOSPC);
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@ -254,16 +256,12 @@ static int blkif_queue_request(struct request *req)
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buffer_mfn,
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rq_data_dir(req) );
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info->shadow[id].frame[ring_req->nr_segments] =
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mfn_to_pfn(buffer_mfn);
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ring_req->seg[ring_req->nr_segments] =
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info->shadow[id].frame[i] = mfn_to_pfn(buffer_mfn);
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ring_req->seg[i] =
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(struct blkif_request_segment) {
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.gref = ref,
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.first_sect = fsect,
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.last_sect = lsect };
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ring_req->nr_segments++;
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}
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info->ring.req_prod_pvt++;
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@ -622,6 +620,8 @@ static int setup_blkring(struct xenbus_device *dev,
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SHARED_RING_INIT(sring);
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FRONT_RING_INIT(&info->ring, sring, PAGE_SIZE);
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sg_init_table(info->sg, BLKIF_MAX_SEGMENTS_PER_REQUEST);
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err = xenbus_grant_ring(dev, virt_to_mfn(info->ring.sring));
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if (err < 0) {
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free_page((unsigned long)sring);
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2
fs/bio.c
2
fs/bio.c
@ -302,7 +302,7 @@ void bio_init(struct bio *bio)
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struct bio *bio_alloc_bioset(gfp_t gfp_mask, int nr_iovecs, struct bio_set *bs)
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{
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struct bio *bio = NULL;
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void *p;
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void *uninitialized_var(p);
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if (bs) {
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p = mempool_alloc(bs->bio_pool, gfp_mask);
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@ -708,6 +708,8 @@ struct req_iterator {
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};
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/* This should not be used directly - use rq_for_each_segment */
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#define for_each_bio(_bio) \
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for (; _bio; _bio = _bio->bi_next)
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#define __rq_for_each_bio(_bio, rq) \
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if ((rq->bio)) \
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for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
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