*/
if (b_pfn < (min_t(u64, 0xffffffffUL, BLK_BOUNCE_HIGH) >> PAGE_SHIFT))
dma = 1;
- q->bounce_pfn = max_low_pfn;
+ q->limits.bounce_pfn = max_low_pfn;
#else
if (b_pfn < blk_max_low_pfn)
dma = 1;
- q->bounce_pfn = b_pfn;
+ q->limits.bounce_pfn = b_pfn;
#endif
if (dma) {
init_emergency_isa_pool();
q->bounce_gfp = GFP_NOIO | GFP_DMA;
- q->bounce_pfn = b_pfn;
+ q->limits.bounce_pfn = b_pfn;
}
}
EXPORT_SYMBOL(blk_queue_bounce_limit);
}
if (BLK_DEF_MAX_SECTORS > max_sectors)
- q->max_hw_sectors = q->max_sectors = max_sectors;
+ q->limits.max_hw_sectors = q->limits.max_sectors = max_sectors;
else {
- q->max_sectors = BLK_DEF_MAX_SECTORS;
- q->max_hw_sectors = max_sectors;
+ q->limits.max_sectors = BLK_DEF_MAX_SECTORS;
+ q->limits.max_hw_sectors = max_sectors;
}
}
EXPORT_SYMBOL(blk_queue_max_sectors);
+void blk_queue_max_hw_sectors(struct request_queue *q, unsigned int max_sectors)
+{
+ if (BLK_DEF_MAX_SECTORS > max_sectors)
+ q->limits.max_hw_sectors = BLK_DEF_MAX_SECTORS;
+ else
+ q->limits.max_hw_sectors = max_sectors;
+}
+EXPORT_SYMBOL(blk_queue_max_hw_sectors);
+
/**
* blk_queue_max_phys_segments - set max phys segments for a request for this queue
* @q: the request queue for the device
__func__, max_segments);
}
- q->max_phys_segments = max_segments;
+ q->limits.max_phys_segments = max_segments;
}
EXPORT_SYMBOL(blk_queue_max_phys_segments);
__func__, max_segments);
}
- q->max_hw_segments = max_segments;
+ q->limits.max_hw_segments = max_segments;
}
EXPORT_SYMBOL(blk_queue_max_hw_segments);
__func__, max_size);
}
- q->max_segment_size = max_size;
+ q->limits.max_segment_size = max_size;
}
EXPORT_SYMBOL(blk_queue_max_segment_size);
**/
void blk_queue_logical_block_size(struct request_queue *q, unsigned short size)
{
- q->logical_block_size = size;
+ q->limits.logical_block_size = size;
+
+ if (q->limits.physical_block_size < size)
+ q->limits.physical_block_size = size;
+
+ if (q->limits.io_min < q->limits.physical_block_size)
+ q->limits.io_min = q->limits.physical_block_size;
}
EXPORT_SYMBOL(blk_queue_logical_block_size);
+/**
+ * blk_queue_physical_block_size - set physical block size for the queue
+ * @q: the request queue for the device
+ * @size: the physical block size, in bytes
+ *
+ * Description:
+ * This should be set to the lowest possible sector size that the
+ * hardware can operate on without reverting to read-modify-write
+ * operations.
+ */
+void blk_queue_physical_block_size(struct request_queue *q, unsigned short size)
+{
+ q->limits.physical_block_size = size;
+
+ if (q->limits.physical_block_size < q->limits.logical_block_size)
+ q->limits.physical_block_size = q->limits.logical_block_size;
+
+ if (q->limits.io_min < q->limits.physical_block_size)
+ q->limits.io_min = q->limits.physical_block_size;
+}
+EXPORT_SYMBOL(blk_queue_physical_block_size);
+
+/**
+ * blk_queue_alignment_offset - set physical block alignment offset
+ * @q: the request queue for the device
+ * @alignment: alignment offset in bytes
+ *
+ * Description:
+ * Some devices are naturally misaligned to compensate for things like
+ * the legacy DOS partition table 63-sector offset. Low-level drivers
+ * should call this function for devices whose first sector is not
+ * naturally aligned.
+ */
+void blk_queue_alignment_offset(struct request_queue *q, unsigned int offset)
+{
+ q->limits.alignment_offset =
+ offset & (q->limits.physical_block_size - 1);
+ q->limits.misaligned = 0;
+}
+EXPORT_SYMBOL(blk_queue_alignment_offset);
+
+/**
+ * blk_queue_io_min - set minimum request size for the queue
+ * @q: the request queue for the device
+ * @io_min: smallest I/O size in bytes
+ *
+ * Description:
+ * Some devices have an internal block size bigger than the reported
+ * hardware sector size. This function can be used to signal the
+ * smallest I/O the device can perform without incurring a performance
+ * penalty.
+ */
+void blk_queue_io_min(struct request_queue *q, unsigned int min)
+{
+ q->limits.io_min = min;
+
+ if (q->limits.io_min < q->limits.logical_block_size)
+ q->limits.io_min = q->limits.logical_block_size;
+
+ if (q->limits.io_min < q->limits.physical_block_size)
+ q->limits.io_min = q->limits.physical_block_size;
+}
+EXPORT_SYMBOL(blk_queue_io_min);
+
+/**
+ * blk_queue_io_opt - set optimal request size for the queue
+ * @q: the request queue for the device
+ * @io_opt: optimal request size in bytes
+ *
+ * Description:
+ * Drivers can call this function to set the preferred I/O request
+ * size for devices that report such a value.
+ */
+void blk_queue_io_opt(struct request_queue *q, unsigned int opt)
+{
+ q->limits.io_opt = opt;
+}
+EXPORT_SYMBOL(blk_queue_io_opt);
+
/*
* Returns the minimum that is _not_ zero, unless both are zero.
*/
void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b)
{
/* zero is "infinity" */
- t->max_sectors = min_not_zero(t->max_sectors, b->max_sectors);
- t->max_hw_sectors = min_not_zero(t->max_hw_sectors, b->max_hw_sectors);
- t->seg_boundary_mask = min_not_zero(t->seg_boundary_mask, b->seg_boundary_mask);
+ t->limits.max_sectors = min_not_zero(queue_max_sectors(t),
+ queue_max_sectors(b));
+
+ t->limits.max_hw_sectors = min_not_zero(queue_max_hw_sectors(t),
+ queue_max_hw_sectors(b));
+
+ t->limits.seg_boundary_mask = min_not_zero(queue_segment_boundary(t),
+ queue_segment_boundary(b));
+
+ t->limits.max_phys_segments = min_not_zero(queue_max_phys_segments(t),
+ queue_max_phys_segments(b));
+
+ t->limits.max_hw_segments = min_not_zero(queue_max_hw_segments(t),
+ queue_max_hw_segments(b));
+
+ t->limits.max_segment_size = min_not_zero(queue_max_segment_size(t),
+ queue_max_segment_size(b));
+
+ t->limits.logical_block_size = max(queue_logical_block_size(t),
+ queue_logical_block_size(b));
- 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_segment_size = min_not_zero(t->max_segment_size, b->max_segment_size);
- t->logical_block_size = max(t->logical_block_size, b->logical_block_size);
if (!t->queue_lock)
WARN_ON_ONCE(1);
else if (!test_bit(QUEUE_FLAG_CLUSTER, &b->queue_flags)) {
EXPORT_SYMBOL(blk_queue_stack_limits);
/**
+ * blk_stack_limits - adjust queue_limits for stacked devices
+ * @t: the stacking driver limits (top)
+ * @b: the underlying queue limits (bottom)
+ * @offset: offset to beginning of data within component device
+ *
+ * Description:
+ * Merges two queue_limit structs. Returns 0 if alignment didn't
+ * change. Returns -1 if adding the bottom device caused
+ * misalignment.
+ */
+int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
+ sector_t offset)
+{
+ t->max_sectors = min_not_zero(t->max_sectors, b->max_sectors);
+ t->max_hw_sectors = min_not_zero(t->max_hw_sectors, b->max_hw_sectors);
+ t->bounce_pfn = min_not_zero(t->bounce_pfn, b->bounce_pfn);
+
+ 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_segment_size = min_not_zero(t->max_segment_size,
+ b->max_segment_size);
+
+ t->logical_block_size = max(t->logical_block_size,
+ b->logical_block_size);
+
+ t->physical_block_size = max(t->physical_block_size,
+ b->physical_block_size);
+
+ t->io_min = max(t->io_min, b->io_min);
+ t->no_cluster |= b->no_cluster;
+
+ /* Bottom device offset aligned? */
+ if (offset &&
+ (offset & (b->physical_block_size - 1)) != b->alignment_offset) {
+ t->misaligned = 1;
+ return -1;
+ }
+
+ /* If top has no alignment offset, inherit from bottom */
+ if (!t->alignment_offset)
+ t->alignment_offset =
+ b->alignment_offset & (b->physical_block_size - 1);
+
+ /* Top device aligned on logical block boundary? */
+ if (t->alignment_offset & (t->logical_block_size - 1)) {
+ t->misaligned = 1;
+ return -1;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(blk_stack_limits);
+
+/**
+ * disk_stack_limits - adjust queue limits for stacked drivers
+ * @disk: MD/DM gendisk (top)
+ * @bdev: the underlying block device (bottom)
+ * @offset: offset to beginning of data within component device
+ *
+ * Description:
+ * Merges the limits for two queues. Returns 0 if alignment
+ * didn't change. Returns -1 if adding the bottom device caused
+ * misalignment.
+ */
+void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
+ sector_t offset)
+{
+ struct request_queue *t = disk->queue;
+ struct request_queue *b = bdev_get_queue(bdev);
+
+ offset += get_start_sect(bdev) << 9;
+
+ if (blk_stack_limits(&t->limits, &b->limits, offset) < 0) {
+ char top[BDEVNAME_SIZE], bottom[BDEVNAME_SIZE];
+
+ disk_name(disk, 0, top);
+ bdevname(bdev, bottom);
+
+ printk(KERN_NOTICE "%s: Warning: Device %s is misaligned\n",
+ top, bottom);
+ }
+
+ if (!t->queue_lock)
+ WARN_ON_ONCE(1);
+ else if (!test_bit(QUEUE_FLAG_CLUSTER, &b->queue_flags)) {
+ unsigned long flags;
+
+ spin_lock_irqsave(t->queue_lock, flags);
+ if (!test_bit(QUEUE_FLAG_CLUSTER, &b->queue_flags))
+ queue_flag_clear(QUEUE_FLAG_CLUSTER, t);
+ spin_unlock_irqrestore(t->queue_lock, flags);
+ }
+}
+EXPORT_SYMBOL(disk_stack_limits);
+
+/**
* blk_queue_dma_pad - set pad mask
* @q: the request queue for the device
* @mask: pad mask
dma_drain_needed_fn *dma_drain_needed,
void *buf, unsigned int size)
{
- if (q->max_hw_segments < 2 || q->max_phys_segments < 2)
+ if (queue_max_hw_segments(q) < 2 || queue_max_phys_segments(q) < 2)
return -EINVAL;
/* make room for appending the drain */
- --q->max_hw_segments;
- --q->max_phys_segments;
+ blk_queue_max_hw_segments(q, queue_max_hw_segments(q) - 1);
+ blk_queue_max_phys_segments(q, queue_max_phys_segments(q) - 1);
q->dma_drain_needed = dma_drain_needed;
q->dma_drain_buffer = buf;
q->dma_drain_size = size;
__func__, mask);
}
- q->seg_boundary_mask = mask;
+ q->limits.seg_boundary_mask = mask;
}
EXPORT_SYMBOL(blk_queue_segment_boundary);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff