Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.

1 files changed, 0 insertions, 822 deletions

diff --git a/ANDROID_3.4.5/block/blk-settings.c b/ANDROID_3.4.5/block/blk-settings.c
deleted file mode 100644
index d3234fc4..00000000
--- a/ANDROID_3.4.5/block/blk-settings.c
+++ /dev/null
@@ -1,822 +0,0 @@
-/*
- * Functions related to setting various queue properties from drivers
- */
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/bio.h>
-#include <linux/blkdev.h>
-#include <linux/bootmem.h>	/* for max_pfn/max_low_pfn */
-#include <linux/gcd.h>
-#include <linux/lcm.h>
-#include <linux/jiffies.h>
-#include <linux/gfp.h>
-
-#include "blk.h"
-
-unsigned long blk_max_low_pfn;
-EXPORT_SYMBOL(blk_max_low_pfn);
-
-unsigned long blk_max_pfn;
-
-/**
- * blk_queue_prep_rq - set a prepare_request function for queue
- * @q:		queue
- * @pfn:	prepare_request function
- *
- * It's possible for a queue to register a prepare_request callback which
- * is invoked before the request is handed to the request_fn. The goal of
- * the function is to prepare a request for I/O, it can be used to build a
- * cdb from the request data for instance.
- *
- */
-void blk_queue_prep_rq(struct request_queue *q, prep_rq_fn *pfn)
-{
-	q->prep_rq_fn = pfn;
-}
-EXPORT_SYMBOL(blk_queue_prep_rq);
-
-/**
- * blk_queue_unprep_rq - set an unprepare_request function for queue
- * @q:		queue
- * @ufn:	unprepare_request function
- *
- * It's possible for a queue to register an unprepare_request callback
- * which is invoked before the request is finally completed. The goal
- * of the function is to deallocate any data that was allocated in the
- * prepare_request callback.
- *
- */
-void blk_queue_unprep_rq(struct request_queue *q, unprep_rq_fn *ufn)
-{
-	q->unprep_rq_fn = ufn;
-}
-EXPORT_SYMBOL(blk_queue_unprep_rq);
-
-/**
- * blk_queue_merge_bvec - set a merge_bvec function for queue
- * @q:		queue
- * @mbfn:	merge_bvec_fn
- *
- * Usually queues have static limitations on the max sectors or segments that
- * we can put in a request. Stacking drivers may have some settings that
- * are dynamic, and thus we have to query the queue whether it is ok to
- * add a new bio_vec to a bio at a given offset or not. If the block device
- * has such limitations, it needs to register a merge_bvec_fn to control
- * the size of bio's sent to it. Note that a block device *must* allow a
- * single page to be added to an empty bio. The block device driver may want
- * to use the bio_split() function to deal with these bio's. By default
- * no merge_bvec_fn is defined for a queue, and only the fixed limits are
- * honored.
- */
-void blk_queue_merge_bvec(struct request_queue *q, merge_bvec_fn *mbfn)
-{
-	q->merge_bvec_fn = mbfn;
-}
-EXPORT_SYMBOL(blk_queue_merge_bvec);
-
-void blk_queue_softirq_done(struct request_queue *q, softirq_done_fn *fn)
-{
-	q->softirq_done_fn = fn;
-}
-EXPORT_SYMBOL(blk_queue_softirq_done);
-
-void blk_queue_rq_timeout(struct request_queue *q, unsigned int timeout)
-{
-	q->rq_timeout = timeout;
-}
-EXPORT_SYMBOL_GPL(blk_queue_rq_timeout);
-
-void blk_queue_rq_timed_out(struct request_queue *q, rq_timed_out_fn *fn)
-{
-	q->rq_timed_out_fn = fn;
-}
-EXPORT_SYMBOL_GPL(blk_queue_rq_timed_out);
-
-void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn)
-{
-	q->lld_busy_fn = fn;
-}
-EXPORT_SYMBOL_GPL(blk_queue_lld_busy);
-
-/**
- * blk_set_default_limits - reset limits to default values
- * @lim:  the queue_limits structure to reset
- *
- * Description:
- *   Returns a queue_limit struct to its default state.
- */
-void blk_set_default_limits(struct queue_limits *lim)
-{
-	lim->max_segments = BLK_MAX_SEGMENTS;
-	lim->max_integrity_segments = 0;
-	lim->seg_boundary_mask = BLK_SEG_BOUNDARY_MASK;
-	lim->max_segment_size = BLK_MAX_SEGMENT_SIZE;
-	lim->max_sectors = lim->max_hw_sectors = BLK_SAFE_MAX_SECTORS;
-	lim->max_discard_sectors = 0;
-	lim->discard_granularity = 0;
-	lim->discard_alignment = 0;
-	lim->discard_misaligned = 0;
-	lim->discard_zeroes_data = 0;
-	lim->logical_block_size = lim->physical_block_size = lim->io_min = 512;
-	lim->bounce_pfn = (unsigned long)(BLK_BOUNCE_ANY >> PAGE_SHIFT);
-	lim->alignment_offset = 0;
-	lim->io_opt = 0;
-	lim->misaligned = 0;
-	lim->cluster = 1;
-}
-EXPORT_SYMBOL(blk_set_default_limits);
-
-/**
- * blk_set_stacking_limits - set default limits for stacking devices
- * @lim:  the queue_limits structure to reset
- *
- * Description:
- *   Returns a queue_limit struct to its default state. Should be used
- *   by stacking drivers like DM that have no internal limits.
- */
-void blk_set_stacking_limits(struct queue_limits *lim)
-{
-	blk_set_default_limits(lim);
-
-	/* Inherit limits from component devices */
-	lim->discard_zeroes_data = 1;
-	lim->max_segments = USHRT_MAX;
-	lim->max_hw_sectors = UINT_MAX;
-
-	lim->max_sectors = BLK_DEF_MAX_SECTORS;
-}
-EXPORT_SYMBOL(blk_set_stacking_limits);
-
-/**
- * blk_queue_make_request - define an alternate make_request function for a device
- * @q:  the request queue for the device to be affected
- * @mfn: the alternate make_request function
- *
- * Description:
- *    The normal way for &struct bios to be passed to a device
- *    driver is for them to be collected into requests on a request
- *    queue, and then to allow the device driver to select requests
- *    off that queue when it is ready.  This works well for many block
- *    devices. However some block devices (typically virtual devices
- *    such as md or lvm) do not benefit from the processing on the
- *    request queue, and are served best by having the requests passed
- *    directly to them.  This can be achieved by providing a function
- *    to blk_queue_make_request().
- *
- * Caveat:
- *    The driver that does this *must* be able to deal appropriately
- *    with buffers in "highmemory". This can be accomplished by either calling
- *    __bio_kmap_atomic() to get a temporary kernel mapping, or by calling
- *    blk_queue_bounce() to create a buffer in normal memory.
- **/
-void blk_queue_make_request(struct request_queue *q, make_request_fn *mfn)
-{
-	/*
-	 * set defaults
-	 */
-	q->nr_requests = BLKDEV_MAX_RQ;
-
-	q->make_request_fn = mfn;
-	blk_queue_dma_alignment(q, 511);
-	blk_queue_congestion_threshold(q);
-	q->nr_batching = BLK_BATCH_REQ;
-
-	blk_set_default_limits(&q->limits);
-
-	/*
-	 * by default assume old behaviour and bounce for any highmem page
-	 */
-	blk_queue_bounce_limit(q, BLK_BOUNCE_HIGH);
-}
-EXPORT_SYMBOL(blk_queue_make_request);
-
-/**
- * blk_queue_bounce_limit - set bounce buffer limit for queue
- * @q: the request queue for the device
- * @dma_mask: the maximum address the device can handle
- *
- * Description:
- *    Different hardware can have different requirements as to what pages
- *    it can do I/O directly to. A low level driver can call
- *    blk_queue_bounce_limit to have lower memory pages allocated as bounce
- *    buffers for doing I/O to pages residing above @dma_mask.
- **/
-void blk_queue_bounce_limit(struct request_queue *q, u64 dma_mask)
-{
-	unsigned long b_pfn = dma_mask >> PAGE_SHIFT;
-	int dma = 0;
-
-	q->bounce_gfp = GFP_NOIO;
-#if BITS_PER_LONG == 64
-	/*
-	 * Assume anything <= 4GB can be handled by IOMMU.  Actually
-	 * some IOMMUs can handle everything, but I don't know of a
-	 * way to test this here.
-	 */
-	if (b_pfn < (min_t(u64, 0xffffffffUL, BLK_BOUNCE_HIGH) >> PAGE_SHIFT))
-		dma = 1;
-	q->limits.bounce_pfn = max(max_low_pfn, b_pfn);
-#else
-	if (b_pfn < blk_max_low_pfn)
-		dma = 1;
-	q->limits.bounce_pfn = b_pfn;
-#endif
-	if (dma) {
-		init_emergency_isa_pool();
-		q->bounce_gfp = GFP_NOIO | GFP_DMA;
-		q->limits.bounce_pfn = b_pfn;
-	}
-}
-EXPORT_SYMBOL(blk_queue_bounce_limit);
-
-/**
- * blk_limits_max_hw_sectors - set hard and soft limit of max sectors for request
- * @limits: the queue limits
- * @max_hw_sectors:  max hardware sectors in the usual 512b unit
- *
- * Description:
- *    Enables a low level driver to set a hard upper limit,
- *    max_hw_sectors, on the size of requests.  max_hw_sectors is set by
- *    the device driver based upon the combined capabilities of I/O
- *    controller and storage device.
- *
- *    max_sectors is a soft limit imposed by the block layer for
- *    filesystem type requests.  This value can be overridden on a
- *    per-device basis in /sys/block/<device>/queue/max_sectors_kb.
- *    The soft limit can not exceed max_hw_sectors.
- **/
-void blk_limits_max_hw_sectors(struct queue_limits *limits, unsigned int max_hw_sectors)
-{
-	if ((max_hw_sectors << 9) < PAGE_CACHE_SIZE) {
-		max_hw_sectors = 1 << (PAGE_CACHE_SHIFT - 9);
-		printk(KERN_INFO "%s: set to minimum %d\n",
-		       __func__, max_hw_sectors);
-	}
-
-	limits->max_hw_sectors = max_hw_sectors;
-	limits->max_sectors = min_t(unsigned int, max_hw_sectors,
-				    BLK_DEF_MAX_SECTORS);
-}
-EXPORT_SYMBOL(blk_limits_max_hw_sectors);
-
-/**
- * blk_queue_max_hw_sectors - set max sectors for a request for this queue
- * @q:  the request queue for the device
- * @max_hw_sectors:  max hardware sectors in the usual 512b unit
- *
- * Description:
- *    See description for blk_limits_max_hw_sectors().
- **/
-void blk_queue_max_hw_sectors(struct request_queue *q, unsigned int max_hw_sectors)
-{
-	blk_limits_max_hw_sectors(&q->limits, max_hw_sectors);
-}
-EXPORT_SYMBOL(blk_queue_max_hw_sectors);
-
-/**
- * blk_queue_max_discard_sectors - set max sectors for a single discard
- * @q:  the request queue for the device
- * @max_discard_sectors: maximum number of sectors to discard
- **/
-void blk_queue_max_discard_sectors(struct request_queue *q,
-		unsigned int max_discard_sectors)
-{
-	q->limits.max_discard_sectors = max_discard_sectors;
-}
-EXPORT_SYMBOL(blk_queue_max_discard_sectors);
-
-/**
- * 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
- *    hw data segments in a request.
- **/
-void blk_queue_max_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_segments = max_segments;
-}
-EXPORT_SYMBOL(blk_queue_max_segments);
-
-/**
- * blk_queue_max_segment_size - set max segment size for blk_rq_map_sg
- * @q:  the request queue for the device
- * @max_size:  max size of segment in bytes
- *
- * Description:
- *    Enables a low level driver to set an upper limit on the size of a
- *    coalesced segment
- **/
-void blk_queue_max_segment_size(struct request_queue *q, unsigned int max_size)
-{
-	if (max_size < PAGE_CACHE_SIZE) {
-		max_size = PAGE_CACHE_SIZE;
-		printk(KERN_INFO "%s: set to minimum %d\n",
-		       __func__, max_size);
-	}
-
-	q->limits.max_segment_size = max_size;
-}
-EXPORT_SYMBOL(blk_queue_max_segment_size);
-
-/**
- * blk_queue_logical_block_size - set logical block size for the queue
- * @q:  the request queue for the device
- * @size:  the logical block size, in bytes
- *
- * Description:
- *   This should be set to the lowest possible block size that the
- *   storage device can address.  The default of 512 covers most
- *   hardware.
- **/
-void blk_queue_logical_block_size(struct request_queue *q, unsigned short 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 int 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
- * @offset: 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_limits_io_min - set minimum request size for a device
- * @limits: the queue limits
- * @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_limits_io_min(struct queue_limits *limits, unsigned int min)
-{
-	limits->io_min = min;
-
-	if (limits->io_min < limits->logical_block_size)
-		limits->io_min = limits->logical_block_size;
-
-	if (limits->io_min < limits->physical_block_size)
-		limits->io_min = limits->physical_block_size;
-}
-EXPORT_SYMBOL(blk_limits_io_min);
-
-/**
- * blk_queue_io_min - set minimum request size for the queue
- * @q:	the request queue for the device
- * @min:  smallest I/O size in bytes
- *
- * Description:
- *   Storage devices may report a granularity or preferred minimum I/O
- *   size which is the smallest request the device can perform without
- *   incurring a performance penalty.  For disk drives this is often the
- *   physical block size.  For RAID arrays it is often the stripe chunk
- *   size.  A properly aligned multiple of minimum_io_size is the
- *   preferred request size for workloads where a high number of I/O
- *   operations is desired.
- */
-void blk_queue_io_min(struct request_queue *q, unsigned int min)
-{
-	blk_limits_io_min(&q->limits, min);
-}
-EXPORT_SYMBOL(blk_queue_io_min);
-
-/**
- * blk_limits_io_opt - set optimal request size for a device
- * @limits: the queue limits
- * @opt:  smallest I/O size in bytes
- *
- * Description:
- *   Storage devices may report an optimal I/O size, which is the
- *   device's preferred unit for sustained I/O.  This is rarely reported
- *   for disk drives.  For RAID arrays it is usually the stripe width or
- *   the internal track size.  A properly aligned multiple of
- *   optimal_io_size is the preferred request size for workloads where
- *   sustained throughput is desired.
- */
-void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt)
-{
-	limits->io_opt = opt;
-}
-EXPORT_SYMBOL(blk_limits_io_opt);
-
-/**
- * blk_queue_io_opt - set optimal request size for the queue
- * @q:	the request queue for the device
- * @opt:  optimal request size in bytes
- *
- * Description:
- *   Storage devices may report an optimal I/O size, which is the
- *   device's preferred unit for sustained I/O.  This is rarely reported
- *   for disk drives.  For RAID arrays it is usually the stripe width or
- *   the internal track size.  A properly aligned multiple of
- *   optimal_io_size is the preferred request size for workloads where
- *   sustained throughput is desired.
- */
-void blk_queue_io_opt(struct request_queue *q, unsigned int opt)
-{
-	blk_limits_io_opt(&q->limits, opt);
-}
-EXPORT_SYMBOL(blk_queue_io_opt);
-
-/**
- * blk_queue_stack_limits - inherit underlying queue limits for stacked drivers
- * @t:	the stacking driver (top)
- * @b:  the underlying device (bottom)
- **/
-void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b)
-{
-	blk_stack_limits(&t->limits, &b->limits, 0);
-}
-EXPORT_SYMBOL(blk_queue_stack_limits);
-
-/**
- * blk_stack_limits - adjust queue_limits for stacked devices
- * @t:	the stacking driver limits (top device)
- * @b:  the underlying queue limits (bottom, component device)
- * @start:  first data sector within component device
- *
- * Description:
- *    This function is used by stacking drivers like MD and DM to ensure
- *    that all component devices have compatible block sizes and
- *    alignments.  The stacking driver must provide a queue_limits
- *    struct (top) and then iteratively call the stacking function for
- *    all component (bottom) devices.  The stacking function will
- *    attempt to combine the values and ensure proper alignment.
- *
- *    Returns 0 if the top and bottom queue_limits are compatible.  The
- *    top device's block sizes and alignment offsets may be adjusted to
- *    ensure alignment with the bottom device. If no compatible sizes
- *    and alignments exist, -1 is returned and the resulting top
- *    queue_limits will have the misaligned flag set to indicate that
- *    the alignment_offset is undefined.
- */
-int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
-		     sector_t start)
-{
-	unsigned int top, bottom, alignment, ret = 0;
-
-	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_segments = min_not_zero(t->max_segments, b->max_segments);
-	t->max_integrity_segments = min_not_zero(t->max_integrity_segments,
-						 b->max_integrity_segments);
-
-	t->max_segment_size = min_not_zero(t->max_segment_size,
-					   b->max_segment_size);
-
-	t->misaligned |= b->misaligned;
-
-	alignment = queue_limit_alignment_offset(b, start);
-
-	/* Bottom device has different alignment.  Check that it is
-	 * compatible with the current top alignment.
-	 */
-	if (t->alignment_offset != alignment) {
-
-		top = max(t->physical_block_size, t->io_min)
-			+ t->alignment_offset;
-		bottom = max(b->physical_block_size, b->io_min) + alignment;
-
-		/* Verify that top and bottom intervals line up */
-		if (max(top, bottom) & (min(top, bottom) - 1)) {
-			t->misaligned = 1;
-			ret = -1;
-		}
-	}
-
-	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->io_opt = lcm(t->io_opt, b->io_opt);
-
-	t->cluster &= b->cluster;
-	t->discard_zeroes_data &= b->discard_zeroes_data;
-
-	/* Physical block size a multiple of the logical block size? */
-	if (t->physical_block_size & (t->logical_block_size - 1)) {
-		t->physical_block_size = t->logical_block_size;
-		t->misaligned = 1;
-		ret = -1;
-	}
-
-	/* Minimum I/O a multiple of the physical block size? */
-	if (t->io_min & (t->physical_block_size - 1)) {
-		t->io_min = t->physical_block_size;
-		t->misaligned = 1;
-		ret = -1;
-	}
-
-	/* Optimal I/O a multiple of the physical block size? */
-	if (t->io_opt & (t->physical_block_size - 1)) {
-		t->io_opt = 0;
-		t->misaligned = 1;
-		ret = -1;
-	}
-
-	/* Find lowest common alignment_offset */
-	t->alignment_offset = lcm(t->alignment_offset, alignment)
-		& (max(t->physical_block_size, t->io_min) - 1);
-
-	/* Verify that new alignment_offset is on a logical block boundary */
-	if (t->alignment_offset & (t->logical_block_size - 1)) {
-		t->misaligned = 1;
-		ret = -1;
-	}
-
-	/* Discard alignment and granularity */
-	if (b->discard_granularity) {
-		alignment = queue_limit_discard_alignment(b, start);
-
-		if (t->discard_granularity != 0 &&
-		    t->discard_alignment != alignment) {
-			top = t->discard_granularity + t->discard_alignment;
-			bottom = b->discard_granularity + alignment;
-
-			/* Verify that top and bottom intervals line up */
-			if (max(top, bottom) & (min(top, bottom) - 1))
-				t->discard_misaligned = 1;
-		}
-
-		t->max_discard_sectors = min_not_zero(t->max_discard_sectors,
-						      b->max_discard_sectors);
-		t->discard_granularity = max(t->discard_granularity,
-					     b->discard_granularity);
-		t->discard_alignment = lcm(t->discard_alignment, alignment) &
-			(t->discard_granularity - 1);
-	}
-
-	return ret;
-}
-EXPORT_SYMBOL(blk_stack_limits);
-
-/**
- * bdev_stack_limits - adjust queue limits for stacked drivers
- * @t:	the stacking driver limits (top device)
- * @bdev:  the component block_device (bottom)
- * @start:  first data sector within component device
- *
- * Description:
- *    Merges queue limits for a top device and a block_device.  Returns
- *    0 if alignment didn't change.  Returns -1 if adding the bottom
- *    device caused misalignment.
- */
-int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev,
-		      sector_t start)
-{
-	struct request_queue *bq = bdev_get_queue(bdev);
-
-	start += get_start_sect(bdev);
-
-	return blk_stack_limits(t, &bq->limits, start);
-}
-EXPORT_SYMBOL(bdev_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 a top level gendisk and a bottom level
- *    block_device.
- */
-void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
-		       sector_t offset)
-{
-	struct request_queue *t = disk->queue;
-
-	if (bdev_stack_limits(&t->limits, bdev, offset >> 9) < 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);
-	}
-}
-EXPORT_SYMBOL(disk_stack_limits);
-
-/**
- * blk_queue_dma_pad - set pad mask
- * @q:     the request queue for the device
- * @mask:  pad mask
- *
- * Set dma pad mask.
- *
- * Appending pad buffer to a request modifies the last entry of a
- * scatter list such that it includes the pad buffer.
- **/
-void blk_queue_dma_pad(struct request_queue *q, unsigned int mask)
-{
-	q->dma_pad_mask = mask;
-}
-EXPORT_SYMBOL(blk_queue_dma_pad);
-
-/**
- * blk_queue_update_dma_pad - update pad mask
- * @q:     the request queue for the device
- * @mask:  pad mask
- *
- * Update dma pad mask.
- *
- * Appending pad buffer to a request modifies the last entry of a
- * scatter list such that it includes the pad buffer.
- **/
-void blk_queue_update_dma_pad(struct request_queue *q, unsigned int mask)
-{
-	if (mask > q->dma_pad_mask)
-		q->dma_pad_mask = mask;
-}
-EXPORT_SYMBOL(blk_queue_update_dma_pad);
-
-/**
- * blk_queue_dma_drain - Set up a drain buffer for excess dma.
- * @q:  the request queue for the device
- * @dma_drain_needed: fn which returns non-zero if drain is necessary
- * @buf:	physically contiguous buffer
- * @size:	size of the buffer in bytes
- *
- * Some devices have excess DMA problems and can't simply discard (or
- * zero fill) the unwanted piece of the transfer.  They have to have a
- * real area of memory to transfer it into.  The use case for this is
- * ATAPI devices in DMA mode.  If the packet command causes a transfer
- * bigger than the transfer size some HBAs will lock up if there
- * aren't DMA elements to contain the excess transfer.  What this API
- * 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_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_segments(q) < 2)
-		return -EINVAL;
-	/* make room for appending the drain */
-	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;
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(blk_queue_dma_drain);
-
-/**
- * blk_queue_segment_boundary - set boundary rules for segment merging
- * @q:  the request queue for the device
- * @mask:  the memory boundary mask
- **/
-void blk_queue_segment_boundary(struct request_queue *q, unsigned long mask)
-{
-	if (mask < PAGE_CACHE_SIZE - 1) {
-		mask = PAGE_CACHE_SIZE - 1;
-		printk(KERN_INFO "%s: set to minimum %lx\n",
-		       __func__, mask);
-	}
-
-	q->limits.seg_boundary_mask = mask;
-}
-EXPORT_SYMBOL(blk_queue_segment_boundary);
-
-/**
- * blk_queue_dma_alignment - set dma length and memory alignment
- * @q:     the request queue for the device
- * @mask:  alignment mask
- *
- * description:
- *    set required memory and length alignment for direct dma transactions.
- *    this is used when building direct io requests for the queue.
- *
- **/
-void blk_queue_dma_alignment(struct request_queue *q, int mask)
-{
-	q->dma_alignment = mask;
-}
-EXPORT_SYMBOL(blk_queue_dma_alignment);
-
-/**
- * blk_queue_update_dma_alignment - update dma length and memory alignment
- * @q:     the request queue for the device
- * @mask:  alignment mask
- *
- * description:
- *    update required memory and length alignment for direct dma transactions.
- *    If the requested alignment is larger than the current alignment, then
- *    the current queue alignment is updated to the new value, otherwise it
- *    is left alone.  The design of this is to allow multiple objects
- *    (driver, device, transport etc) to set their respective
- *    alignments without having them interfere.
- *
- **/
-void blk_queue_update_dma_alignment(struct request_queue *q, int mask)
-{
-	BUG_ON(mask > PAGE_SIZE);
-
-	if (mask > q->dma_alignment)
-		q->dma_alignment = mask;
-}
-EXPORT_SYMBOL(blk_queue_update_dma_alignment);
-
-/**
- * blk_queue_flush - configure queue's cache flush capability
- * @q:		the request queue for the device
- * @flush:	0, REQ_FLUSH or REQ_FLUSH | REQ_FUA
- *
- * Tell block layer cache flush capability of @q.  If it supports
- * flushing, REQ_FLUSH should be set.  If it supports bypassing
- * write cache for individual writes, REQ_FUA should be set.
- */
-void blk_queue_flush(struct request_queue *q, unsigned int flush)
-{
-	WARN_ON_ONCE(flush & ~(REQ_FLUSH | REQ_FUA));
-
-	if (WARN_ON_ONCE(!(flush & REQ_FLUSH) && (flush & REQ_FUA)))
-		flush &= ~REQ_FUA;
-
-	q->flush_flags = flush & (REQ_FLUSH | REQ_FUA);
-}
-EXPORT_SYMBOL_GPL(blk_queue_flush);
-
-void blk_queue_flush_queueable(struct request_queue *q, bool queueable)
-{
-	q->flush_not_queueable = !queueable;
-}
-EXPORT_SYMBOL_GPL(blk_queue_flush_queueable);
-
-static int __init blk_settings_init(void)
-{
-	blk_max_low_pfn = max_low_pfn - 1;
-	blk_max_pfn = max_pfn - 1;
-	return 0;
-}
-subsys_initcall(blk_settings_init);