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block: Consolidate phys_segment and hw_segment limits

Browse source 
Except for SCSI no device drivers distinguish between physical and
hardware segment limits.  Consolidate the two into a single segment
limit.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Martin K. Petersen 2010-02-26 00:20:39 -05:00 committed by Jens Axboe
parent 086fa5ff08
commit 8a78362c4e
35 changed files with 70 additions and 136 deletions
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2
arch/um/drivers/ubd_kern.c
View file

@ -849,7 +849,7 @@ static int ubd_add(int n, char **error_out)
}
ubd_dev->queue->queuedata = ubd_dev;
blk_queue_max_hw_segments(ubd_dev->queue, MAX_SG);
blk_queue_max_segments(ubd_dev->queue, MAX_SG);
err = ubd_disk_register(UBD_MAJOR, ubd_dev->size, n, &ubd_gendisk[n]);
if(err){
*error_out = "Failed to register device";

3
block/blk-core.c
View file

@ -1614,8 +1614,7 @@ int blk_rq_check_limits(struct request_queue *q, struct request *rq)
* limitation.
*/
blk_recalc_rq_segments(rq);
if (rq->nr_phys_segments > queue_max_phys_segments(q) ||
rq->nr_phys_segments > queue_max_hw_segments(q)) {
if (rq->nr_phys_segments > queue_max_segments(q)) {
printk(KERN_ERR "%s: over max segments limit.\n", __func__);
return -EIO;
}

8
block/blk-merge.c
View file

@ -206,8 +206,7 @@ static inline int ll_new_hw_segment(struct request_queue *q,
{
int nr_phys_segs = bio_phys_segments(q, bio);
if (req->nr_phys_segments + nr_phys_segs > queue_max_hw_segments(q) ||
req->nr_phys_segments + nr_phys_segs > queue_max_phys_segments(q)) {
if (req->nr_phys_segments + nr_phys_segs > queue_max_segments(q)) {
req->cmd_flags |= REQ_NOMERGE;
if (req == q->last_merge)
q->last_merge = NULL;
@ -300,10 +299,7 @@ static int ll_merge_requests_fn(struct request_queue *q, struct request *req,
total_phys_segments--;
}
if (total_phys_segments > queue_max_phys_segments(q))
return 0;
if (total_phys_segments > queue_max_hw_segments(q))
if (total_phys_segments > queue_max_segments(q))
return 0;
/* Merge is OK... */

60
block/blk-settings.c
View file

@ -91,8 +91,7 @@ EXPORT_SYMBOL_GPL(blk_queue_lld_busy);
*/
void blk_set_default_limits(struct queue_limits *lim)
{
lim->max_phys_segments = MAX_PHYS_SEGMENTS;
lim->max_hw_segments = MAX_HW_SEGMENTS;
lim->max_segments = BLK_MAX_SEGMENTS;
lim->seg_boundary_mask = BLK_SEG_BOUNDARY_MASK;
lim->max_segment_size = BLK_MAX_SEGMENT_SIZE;
lim->max_sectors = BLK_DEF_MAX_SECTORS;
@ -252,17 +251,15 @@ void blk_queue_max_discard_sectors(struct request_queue *q,
EXPORT_SYMBOL(blk_queue_max_discard_sectors);
/**
* blk_queue_max_phys_segments - set max phys segments for a request for this queue
* blk_queue_max_segments - set max hw segments for a request for this queue
* @q: the request queue for the device
* @max_segments: max number of segments
*
* Description:
* Enables a low level driver to set an upper limit on the number of
* physical data segments in a request. This would be the largest sized
* scatter list the driver could handle.
* hw data segments in a request.
**/
void blk_queue_max_phys_segments(struct request_queue *q,
unsigned short max_segments)
void blk_queue_max_segments(struct request_queue *q, unsigned short max_segments)
{
if (!max_segments) {
max_segments = 1;
@ -270,33 +267,9 @@ void blk_queue_max_phys_segments(struct request_queue *q,
__func__, max_segments);
}
q->limits.max_phys_segments = max_segments;
q->limits.max_segments = max_segments;
}
EXPORT_SYMBOL(blk_queue_max_phys_segments);
/**
* blk_queue_max_hw_segments - set max hw segments for a request for this queue
* @q: the request queue for the device
* @max_segments: max number of segments
*
* Description:
* Enables a low level driver to set an upper limit on the number of
* hw data segments in a request. This would be the largest number of
* address/length pairs the host adapter can actually give at once
* to the device.
**/
void blk_queue_max_hw_segments(struct request_queue *q,
unsigned short max_segments)
{
if (!max_segments) {
max_segments = 1;
printk(KERN_INFO "%s: set to minimum %d\n",
__func__, max_segments);
}
q->limits.max_hw_segments = max_segments;
}
EXPORT_SYMBOL(blk_queue_max_hw_segments);
EXPORT_SYMBOL(blk_queue_max_segments);
/**
* blk_queue_max_segment_size - set max segment size for blk_rq_map_sg
@ -531,11 +504,7 @@ int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
t->seg_boundary_mask = min_not_zero(t->seg_boundary_mask,
b->seg_boundary_mask);
t->max_phys_segments = min_not_zero(t->max_phys_segments,
b->max_phys_segments);
t->max_hw_segments = min_not_zero(t->max_hw_segments,
b->max_hw_segments);
t->max_segments = min_not_zero(t->max_segments, b->max_segments);
t->max_segment_size = min_not_zero(t->max_segment_size,
b->max_segment_size);
@ -739,22 +708,19 @@ EXPORT_SYMBOL(blk_queue_update_dma_pad);
* does is adjust the queue so that the buf is always appended
* silently to the scatterlist.
*
* Note: This routine adjusts max_hw_segments to make room for
* appending the drain buffer. If you call
* blk_queue_max_hw_segments() or blk_queue_max_phys_segments() after
* calling this routine, you must set the limit to one fewer than your
* device can support otherwise there won't be room for the drain
* buffer.
* Note: This routine adjusts max_hw_segments to make room for appending
* the drain buffer. If you call blk_queue_max_segments() after calling
* this routine, you must set the limit to one fewer than your device
* can support otherwise there won't be room for the drain buffer.
*/
int blk_queue_dma_drain(struct request_queue *q,
dma_drain_needed_fn *dma_drain_needed,
void *buf, unsigned int size)
{
if (queue_max_hw_segments(q) < 2 || queue_max_phys_segments(q) < 2)
if (queue_max_segments(q) < 2)
return -EINVAL;
/* make room for appending the drain */
blk_queue_max_hw_segments(q, queue_max_hw_segments(q) - 1);
blk_queue_max_phys_segments(q, queue_max_phys_segments(q) - 1);
blk_queue_max_segments(q, queue_max_segments(q) - 1);
q->dma_drain_needed = dma_drain_needed;
q->dma_drain_buffer = buf;
q->dma_drain_size = size;

2
drivers/ata/sata_nv.c
View file

@ -772,7 +772,7 @@ static int nv_adma_slave_config(struct scsi_device *sdev)
}
blk_queue_segment_boundary(sdev->request_queue, segment_boundary);
blk_queue_max_hw_segments(sdev->request_queue, sg_tablesize);
blk_queue_max_segments(sdev->request_queue, sg_tablesize);
ata_port_printk(ap, KERN_INFO,
"DMA mask 0x%llX, segment boundary 0x%lX, hw segs %hu\n",
(unsigned long long)*ap->host->dev->dma_mask,

2
drivers/block/DAC960.c
View file

@ -2534,7 +2534,7 @@ static bool DAC960_RegisterBlockDevice(DAC960_Controller_T *Controller)
blk_queue_bounce_limit(RequestQueue, Controller->BounceBufferLimit);
RequestQueue->queuedata = Controller;
blk_queue_max_hw_segments(RequestQueue, Controller->DriverScatterGatherLimit);
blk_queue_max_phys_segments(RequestQueue, Controller->DriverScatterGatherLimit);
blk_queue_max_segments(RequestQueue, Controller->DriverScatterGatherLimit);
blk_queue_max_hw_sectors(RequestQueue, Controller->MaxBlocksPerCommand);
disk->queue = RequestQueue;
sprintf(disk->disk_name, "rd/c%dd%d", Controller->ControllerNumber, n);

5
drivers/block/cciss.c
View file

@ -1797,10 +1797,7 @@ static int cciss_add_disk(ctlr_info_t *h, struct gendisk *disk,
blk_queue_bounce_limit(disk->queue, h->pdev->dma_mask);
/* This is a hardware imposed limit. */
blk_queue_max_hw_segments(disk->queue, h->maxsgentries);
/* This is a limit in the driver and could be eliminated. */
blk_queue_max_phys_segments(disk->queue, h->maxsgentries);
blk_queue_max_segments(disk->queue, h->maxsgentries);
blk_queue_max_hw_sectors(disk->queue, h->cciss_max_sectors);

5
drivers/block/cpqarray.c
View file

@ -448,11 +448,8 @@ static int __init cpqarray_register_ctlr( int i, struct pci_dev *pdev)
blk_queue_bounce_limit(q, hba[i]->pci_dev->dma_mask);
/* This is a hardware imposed limit. */
blk_queue_max_hw_segments(q, SG_MAX);
blk_queue_max_segments(q, SG_MAX);
/* This is a driver limit and could be eliminated. */
blk_queue_max_phys_segments(q, SG_MAX);
init_timer(&hba[i]->timer);
hba[i]->timer.expires = jiffies + IDA_TIMER;
hba[i]->timer.data = (unsigned long)hba[i];

3
drivers/block/drbd/drbd_nl.c
View file

@ -710,8 +710,7 @@ void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int max_seg_s) __mu
max_seg_s = min(queue_max_sectors(b) * queue_logical_block_size(b), max_seg_s);
blk_queue_max_hw_sectors(q, max_seg_s >> 9);
blk_queue_max_phys_segments(q, max_segments ? max_segments : MAX_PHYS_SEGMENTS);
blk_queue_max_hw_segments(q, max_segments ? max_segments : MAX_HW_SEGMENTS);
blk_queue_max_segments(q, max_segments ? max_segments : BLK_MAX_SEGMENTS);
blk_queue_max_segment_size(q, max_seg_s);
blk_queue_logical_block_size(q, 512);
blk_queue_segment_boundary(q, PAGE_SIZE-1);

3
drivers/block/paride/pf.c
View file

@ -956,8 +956,7 @@ static int __init pf_init(void)
return -ENOMEM;
}
blk_queue_max_phys_segments(pf_queue, cluster);
blk_queue_max_hw_segments(pf_queue, cluster);
blk_queue_max_segments(pf_queue, cluster);
for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++) {
struct gendisk *disk = pf->disk;

4
drivers/block/pktcdvd.c
View file

@ -950,14 +950,14 @@ static void pkt_iosched_process_queue(struct pktcdvd_device *pd)
static int pkt_set_segment_merging(struct pktcdvd_device *pd, struct request_queue *q)
{
if ((pd->settings.size << 9) / CD_FRAMESIZE
<= queue_max_phys_segments(q)) {
<= queue_max_segments(q)) {
/*
* The cdrom device can handle one segment/frame
*/
clear_bit(PACKET_MERGE_SEGS, &pd->flags);
return 0;
} else if ((pd->settings.size << 9) / PAGE_SIZE
<= queue_max_phys_segments(q)) {
<= queue_max_segments(q)) {
/*
* We can handle this case at the expense of some extra memory
* copies during write operations

3
drivers/block/ps3disk.c
View file

@ -482,8 +482,7 @@ static int __devinit ps3disk_probe(struct ps3_system_bus_device *_dev)
blk_queue_ordered(queue, QUEUE_ORDERED_DRAIN_FLUSH,
ps3disk_prepare_flush);
blk_queue_max_phys_segments(queue, -1);
blk_queue_max_hw_segments(queue, -1);
blk_queue_max_segments(queue, -1);
blk_queue_max_segment_size(queue, dev->bounce_size);
gendisk = alloc_disk(PS3DISK_MINORS);

3
drivers/block/ps3vram.c
View file

@ -751,8 +751,7 @@ static int __devinit ps3vram_probe(struct ps3_system_bus_device *dev)
priv->queue = queue;
queue->queuedata = dev;
blk_queue_make_request(queue, ps3vram_make_request);
blk_queue_max_phys_segments(queue, MAX_PHYS_SEGMENTS);
blk_queue_max_hw_segments(queue, MAX_HW_SEGMENTS);
blk_queue_max_segments(queue, BLK_MAX_HW_SEGMENTS);
blk_queue_max_segment_size(queue, BLK_MAX_SEGMENT_SIZE);
blk_queue_max_hw_sectors(queue, BLK_SAFE_MAX_SECTORS);

3
drivers/block/sunvdc.c
View file

@ -691,8 +691,7 @@ static int probe_disk(struct vdc_port *port)
port->disk = g;
blk_queue_max_hw_segments(q, port->ring_cookies);
blk_queue_max_phys_segments(q, port->ring_cookies);
blk_queue_max_segments(q, port->ring_cookies);
blk_queue_max_hw_sectors(q, port->max_xfer_size);
g->major = vdc_major;
g->first_minor = port->vio.vdev->dev_no << PARTITION_SHIFT;

3
drivers/block/sx8.c
View file

@ -1518,8 +1518,7 @@ static int carm_init_disks(struct carm_host *host)
break;
}
disk->queue = q;
blk_queue_max_hw_segments(q, CARM_MAX_REQ_SG);
blk_queue_max_phys_segments(q, CARM_MAX_REQ_SG);
blk_queue_max_segments(q, CARM_MAX_REQ_SG);
blk_queue_segment_boundary(q, CARM_SG_BOUNDARY);
q->queuedata = port;

3
drivers/block/ub.c
View file

@ -2320,8 +2320,7 @@ static int ub_probe_lun(struct ub_dev *sc, int lnum)
disk->queue = q;
blk_queue_bounce_limit(q, BLK_BOUNCE_HIGH);
blk_queue_max_hw_segments(q, UB_MAX_REQ_SG);
blk_queue_max_phys_segments(q, UB_MAX_REQ_SG);
blk_queue_max_segments(q, UB_MAX_REQ_SG);
blk_queue_segment_boundary(q, 0xffffffff); /* Dubious. */
blk_queue_max_hw_sectors(q, UB_MAX_SECTORS);
blk_queue_logical_block_size(q, lun->capacity.bsize);

3
drivers/block/viodasd.c
View file

@ -471,8 +471,7 @@ static int probe_disk(struct viodasd_device *d)
}
d->disk = g;
blk_queue_max_hw_segments(q, VIOMAXBLOCKDMA);
blk_queue_max_phys_segments(q, VIOMAXBLOCKDMA);
blk_queue_max_segments(q, VIOMAXBLOCKDMA);
blk_queue_max_hw_sectors(q, VIODASD_MAXSECTORS);
g->major = VIODASD_MAJOR;
g->first_minor = dev_no << PARTITION_SHIFT;

3
drivers/block/xen-blkfront.c
View file

@ -353,8 +353,7 @@ static int xlvbd_init_blk_queue(struct gendisk *gd, u16 sector_size)
blk_queue_max_segment_size(rq, PAGE_SIZE);
/* Ensure a merged request will fit in a single I/O ring slot. */
blk_queue_max_phys_segments(rq, BLKIF_MAX_SEGMENTS_PER_REQUEST);
blk_queue_max_hw_segments(rq, BLKIF_MAX_SEGMENTS_PER_REQUEST);
blk_queue_max_segments(rq, BLKIF_MAX_SEGMENTS_PER_REQUEST);
/* Make sure buffer addresses are sector-aligned. */
blk_queue_dma_alignment(rq, 511);

2
drivers/cdrom/gdrom.c
View file

@ -741,7 +741,7 @@ static int __devinit probe_gdrom_setupqueue(void)
{
blk_queue_logical_block_size(gd.gdrom_rq, GDROM_HARD_SECTOR);
/* using DMA so memory will need to be contiguous */
blk_queue_max_hw_segments(gd.gdrom_rq, 1);
blk_queue_max_segments(gd.gdrom_rq, 1);
/* set a large max size to get most from DMA */
blk_queue_max_segment_size(gd.gdrom_rq, 0x40000);
gd.disk->queue = gd.gdrom_rq;

3
drivers/cdrom/viocd.c
View file

@ -616,8 +616,7 @@ static int viocd_probe(struct vio_dev *vdev, const struct vio_device_id *id)
gendisk->first_minor = deviceno;
strncpy(gendisk->disk_name, c->name,
sizeof(gendisk->disk_name));
blk_queue_max_hw_segments(q, 1);
blk_queue_max_phys_segments(q, 1);
blk_queue_max_segments(q, 1);
blk_queue_max_hw_sectors(q, 4096 / 512);
gendisk->queue = q;
gendisk->fops = &viocd_fops;

3
drivers/ide/ide-probe.c
View file

@ -790,8 +790,7 @@ static int ide_init_queue(ide_drive_t *drive)
max_sg_entries >>= 1;
#endif /* CONFIG_PCI */
blk_queue_max_hw_segments(q, max_sg_entries);
blk_queue_max_phys_segments(q, max_sg_entries);
blk_queue_max_segments(q, max_sg_entries);
/* assign drive queue */
drive->queue = q;

2
drivers/md/raid5.c
View file

@ -3739,7 +3739,7 @@ static int bio_fits_rdev(struct bio *bi)
if ((bi->bi_size>>9) > queue_max_sectors(q))
return 0;
blk_recount_segments(q, bi);
if (bi->bi_phys_segments > queue_max_phys_segments(q))
if (bi->bi_phys_segments > queue_max_segments(q))
return 0;
if (q->merge_bvec_fn)

3
drivers/memstick/core/mspro_block.c
View file

@ -1227,8 +1227,7 @@ static int mspro_block_init_disk(struct memstick_dev *card)
blk_queue_bounce_limit(msb->queue, limit);
blk_queue_max_hw_sectors(msb->queue, MSPRO_BLOCK_MAX_PAGES);
blk_queue_max_phys_segments(msb->queue, MSPRO_BLOCK_MAX_SEGS);
blk_queue_max_hw_segments(msb->queue, MSPRO_BLOCK_MAX_SEGS);
blk_queue_max_segments(msb->queue, MSPRO_BLOCK_MAX_SEGS);
blk_queue_max_segment_size(msb->queue,
MSPRO_BLOCK_MAX_PAGES * msb->page_size);

3
drivers/message/i2o/i2o_block.c
View file

@ -1065,9 +1065,8 @@ static int i2o_block_probe(struct device *dev)
queue = gd->queue;
queue->queuedata = i2o_blk_dev;
blk_queue_max_phys_segments(queue, I2O_MAX_PHYS_SEGMENTS);
blk_queue_max_hw_sectors(queue, max_sectors);
blk_queue_max_hw_segments(queue, i2o_sg_tablesize(c, body_size));
blk_queue_max_segments(queue, i2o_sg_tablesize(c, body_size));
osm_debug("max sectors = %d\n", queue->max_sectors);
osm_debug("phys segments = %d\n", queue->max_phys_segments);

6
drivers/mmc/card/queue.c
View file

@ -155,8 +155,7 @@ int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card, spinlock_t *lock
if (mq->bounce_buf) {
blk_queue_bounce_limit(mq->queue, BLK_BOUNCE_ANY);
blk_queue_max_hw_sectors(mq->queue, bouncesz / 512);
blk_queue_max_phys_segments(mq->queue, bouncesz / 512);
blk_queue_max_hw_segments(mq->queue, bouncesz / 512);
blk_queue_max_segments(mq->queue, bouncesz / 512);
blk_queue_max_segment_size(mq->queue, bouncesz);
mq->sg = kmalloc(sizeof(struct scatterlist),
@ -182,8 +181,7 @@ int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card, spinlock_t *lock
blk_queue_bounce_limit(mq->queue, limit);
blk_queue_max_hw_sectors(mq->queue,
min(host->max_blk_count, host->max_req_size / 512));
blk_queue_max_phys_segments(mq->queue, host->max_phys_segs);
blk_queue_max_hw_segments(mq->queue, host->max_hw_segs);
blk_queue_max_segments(mq->queue, host->max_hw_segs);
blk_queue_max_segment_size(mq->queue, host->max_seg_size);
mq->sg = kmalloc(sizeof(struct scatterlist) *

3
drivers/s390/block/dasd.c
View file

@ -2130,8 +2130,7 @@ static void dasd_setup_queue(struct dasd_block *block)
blk_queue_logical_block_size(block->request_queue, block->bp_block);
max = block->base->discipline->max_blocks << block->s2b_shift;
blk_queue_max_hw_sectors(block->request_queue, max);
blk_queue_max_phys_segments(block->request_queue, -1L);
blk_queue_max_hw_segments(block->request_queue, -1L);
blk_queue_max_segments(block->request_queue, -1L);
/* with page sized segments we can translate each segement into
* one idaw/tidaw
*/

3
drivers/s390/char/tape_block.c
View file

@ -223,8 +223,7 @@ tapeblock_setup_device(struct tape_device * device)
blk_queue_logical_block_size(blkdat->request_queue, TAPEBLOCK_HSEC_SIZE);
blk_queue_max_hw_sectors(blkdat->request_queue, TAPEBLOCK_MAX_SEC);
blk_queue_max_phys_segments(blkdat->request_queue, -1L);
blk_queue_max_hw_segments(blkdat->request_queue, -1L);
blk_queue_max_segments(blkdat->request_queue, -1L);
blk_queue_max_segment_size(blkdat->request_queue, -1L);
blk_queue_segment_boundary(blkdat->request_queue, -1L);

4
drivers/scsi/ibmvscsi/ibmvfc.c
View file

@ -4195,7 +4195,7 @@ static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt)
if (tgt->service_parms.class3_parms[0] & 0x80000000)
rport->supported_classes |= FC_COS_CLASS3;
if (rport->rqst_q)
blk_queue_max_hw_segments(rport->rqst_q, 1);
blk_queue_max_segments(rport->rqst_q, 1);
} else
tgt_dbg(tgt, "rport add failed\n");
spin_unlock_irqrestore(vhost->host->host_lock, flags);
@ -4669,7 +4669,7 @@ static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
}
if (shost_to_fc_host(shost)->rqst_q)
blk_queue_max_hw_segments(shost_to_fc_host(shost)->rqst_q, 1);
blk_queue_max_segments(shost_to_fc_host(shost)->rqst_q, 1);
dev_set_drvdata(dev, vhost);
spin_lock(&ibmvfc_driver_lock);
list_add_tail(&vhost->queue, &ibmvfc_head);

4
drivers/scsi/scsi_lib.c
View file

@ -1624,8 +1624,8 @@ struct request_queue *__scsi_alloc_queue(struct Scsi_Host *shost,
/*
* this limit is imposed by hardware restrictions
*/
blk_queue_max_hw_segments(q, shost->sg_tablesize);
blk_queue_max_phys_segments(q, SCSI_MAX_SG_CHAIN_SEGMENTS);
blk_queue_max_segments(q, min_t(unsigned short, shost->sg_tablesize,
SCSI_MAX_SG_CHAIN_SEGMENTS));
blk_queue_max_hw_sectors(q, shost->max_sectors);
blk_queue_bounce_limit(q, scsi_calculate_bounce_limit(shost));

6
drivers/scsi/sg.c
View file

@ -287,8 +287,7 @@ sg_open(struct inode *inode, struct file *filp)
if (list_empty(&sdp->sfds)) { /* no existing opens on this device */
sdp->sgdebug = 0;
q = sdp->device->request_queue;
sdp->sg_tablesize = min(queue_max_hw_segments(q),
queue_max_phys_segments(q));
sdp->sg_tablesize = queue_max_segments(q);
}
if ((sfp = sg_add_sfp(sdp, dev)))
filp->private_data = sfp;
@ -1376,8 +1375,7 @@ static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
sdp->device = scsidp;
INIT_LIST_HEAD(&sdp->sfds);
init_waitqueue_head(&sdp->o_excl_wait);
sdp->sg_tablesize = min(queue_max_hw_segments(q),
queue_max_phys_segments(q));
sdp->sg_tablesize = queue_max_segments(q);
sdp->index = k;
kref_init(&sdp->d_ref);

3
drivers/scsi/st.c
View file

@ -3983,8 +3983,7 @@ static int st_probe(struct device *dev)
return -ENODEV;
}
i = min(queue_max_hw_segments(SDp->request_queue),
queue_max_phys_segments(SDp->request_queue));
i = queue_max_segments(SDp->request_queue);
if (st_max_sg_segs < i)
i = st_max_sg_segs;
buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i);

5
drivers/staging/hv/blkvsc_drv.c
View file

@ -363,10 +363,7 @@ static int blkvsc_probe(struct device *device)
blkdev->gd->queue = blk_init_queue(blkvsc_request, &blkdev->lock);
blk_queue_max_segment_size(blkdev->gd->queue, PAGE_SIZE);
blk_queue_max_phys_segments(blkdev->gd->queue,
MAX_MULTIPAGE_BUFFER_COUNT);
blk_queue_max_hw_segments(blkdev->gd->queue,
MAX_MULTIPAGE_BUFFER_COUNT);
blk_queue_max_segments(blkdev->gd->queue, MAX_MULTIPAGE_BUFFER_COUNT);
blk_queue_segment_boundary(blkdev->gd->queue, PAGE_SIZE-1);
blk_queue_bounce_limit(blkdev->gd->queue, BLK_BOUNCE_ANY);
blk_queue_dma_alignment(blkdev->gd->queue, 511);

9
fs/bio.c
View file

@ -507,10 +507,8 @@ int bio_get_nr_vecs(struct block_device *bdev)
int nr_pages;
nr_pages = ((queue_max_sectors(q) << 9) + PAGE_SIZE - 1) >> PAGE_SHIFT;
if (nr_pages > queue_max_phys_segments(q))
nr_pages = queue_max_phys_segments(q);
if (nr_pages > queue_max_hw_segments(q))
nr_pages = queue_max_hw_segments(q);
if (nr_pages > queue_max_segments(q))
nr_pages = queue_max_segments(q);
return nr_pages;
}
@ -575,8 +573,7 @@ static int __bio_add_page(struct request_queue *q, struct bio *bio, struct page
* make this too complex.
*/
while (bio->bi_phys_segments >= queue_max_phys_segments(q)
|| bio->bi_phys_segments >= queue_max_hw_segments(q)) {
while (bio->bi_phys_segments >= queue_max_segments(q)) {
if (retried_segments)
return 0;

27
include/linux/blkdev.h
View file

@ -316,8 +316,7 @@ struct queue_limits {
unsigned int discard_alignment;
unsigned short logical_block_size;
unsigned short max_hw_segments;
unsigned short max_phys_segments;
unsigned short max_segments;
unsigned char misaligned;
unsigned char discard_misaligned;
@ -929,8 +928,19 @@ static inline void blk_queue_max_sectors(struct request_queue *q, unsigned int m
blk_queue_max_hw_sectors(q, max);
}
extern void blk_queue_max_phys_segments(struct request_queue *, unsigned short);
extern void blk_queue_max_hw_segments(struct request_queue *, unsigned short);
extern void blk_queue_max_segments(struct request_queue *, unsigned short);
static inline void blk_queue_max_phys_segments(struct request_queue *q, unsigned short max)
{
blk_queue_max_segments(q, max);
}
static inline void blk_queue_max_hw_segments(struct request_queue *q, unsigned short max)
{
blk_queue_max_segments(q, max);
}
extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
extern void blk_queue_max_discard_sectors(struct request_queue *q,
unsigned int max_discard_sectors);
@ -1055,14 +1065,9 @@ static inline unsigned int queue_max_hw_sectors(struct request_queue *q)
return q->limits.max_hw_sectors;
}
static inline unsigned short queue_max_hw_segments(struct request_queue *q)
static inline unsigned short queue_max_segments(struct request_queue *q)
{
return q->limits.max_hw_segments;
}
static inline unsigned short queue_max_phys_segments(struct request_queue *q)
{
return q->limits.max_phys_segments;
return q->limits.max_segments;
}
static inline unsigned int queue_max_segment_size(struct request_queue *q)

2
include/linux/i2o.h
View file

@ -385,7 +385,7 @@
/* defines for max_sectors and max_phys_segments */
#define I2O_MAX_SECTORS 1024
#define I2O_MAX_SECTORS_LIMITED 128
#define I2O_MAX_PHYS_SEGMENTS MAX_PHYS_SEGMENTS
#define I2O_MAX_PHYS_SEGMENTS BLK_MAX_SEGMENTS
/*
* Message structures