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block/blk-settings.c
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/* * 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 */ |
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#include <linux/gcd.h> |
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#include <linux/lcm.h> |
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#include <linux/jiffies.h> |
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#include <linux/gfp.h> |
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#include "blk.h" |
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unsigned long blk_max_low_pfn; |
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EXPORT_SYMBOL(blk_max_low_pfn); |
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unsigned long blk_max_pfn; |
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/** * 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; } |
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EXPORT_SYMBOL(blk_queue_prep_rq); /** |
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* 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); /** |
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* 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; } |
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EXPORT_SYMBOL(blk_queue_merge_bvec); void blk_queue_softirq_done(struct request_queue *q, softirq_done_fn *fn) { q->softirq_done_fn = fn; } |
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EXPORT_SYMBOL(blk_queue_softirq_done); |
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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); |
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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); |
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/** |
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* blk_set_default_limits - reset limits to default values |
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* @lim: the queue_limits structure to reset |
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* * Description: * Returns a queue_limit struct to its default state. Can be used by * stacking drivers like DM that stage table swaps and reuse an * existing device queue. */ void blk_set_default_limits(struct queue_limits *lim) { |
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lim->max_segments = BLK_MAX_SEGMENTS; |
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lim->seg_boundary_mask = BLK_SEG_BOUNDARY_MASK; |
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lim->max_segment_size = BLK_MAX_SEGMENT_SIZE; |
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lim->max_sectors = BLK_DEF_MAX_SECTORS; lim->max_hw_sectors = INT_MAX; |
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lim->max_discard_sectors = 0; lim->discard_granularity = 0; lim->discard_alignment = 0; lim->discard_misaligned = 0; |
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lim->discard_zeroes_data = -1; |
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lim->logical_block_size = lim->physical_block_size = lim->io_min = 512; |
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lim->bounce_pfn = (unsigned long)(BLK_BOUNCE_ANY >> PAGE_SHIFT); |
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lim->alignment_offset = 0; lim->io_opt = 0; lim->misaligned = 0; lim->no_cluster = 0; } EXPORT_SYMBOL(blk_set_default_limits); /** |
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* 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. **/ |
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void blk_queue_make_request(struct request_queue *q, make_request_fn *mfn) |
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{ /* * set defaults */ q->nr_requests = BLKDEV_MAX_RQ; |
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|
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q->make_request_fn = mfn; |
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blk_queue_dma_alignment(q, 511); blk_queue_congestion_threshold(q); q->nr_batching = BLK_BATCH_REQ; q->unplug_thresh = 4; /* hmm */ |
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q->unplug_delay = msecs_to_jiffies(3); /* 3 milliseconds */ |
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if (q->unplug_delay == 0) q->unplug_delay = 1; |
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q->unplug_timer.function = blk_unplug_timeout; q->unplug_timer.data = (unsigned long)q; |
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blk_set_default_limits(&q->limits); |
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blk_queue_max_hw_sectors(q, BLK_SAFE_MAX_SECTORS); |
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|
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/* |
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* If the caller didn't supply a lock, fall back to our embedded * per-queue locks */ if (!q->queue_lock) q->queue_lock = &q->__queue_lock; /* |
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* by default assume old behaviour and bounce for any highmem page */ blk_queue_bounce_limit(q, BLK_BOUNCE_HIGH); } |
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EXPORT_SYMBOL(blk_queue_make_request); /** * blk_queue_bounce_limit - set bounce buffer limit for queue |
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* @q: the request queue for the device * @dma_mask: the maximum address the device can handle |
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* * 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 |
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* buffers for doing I/O to pages residing above @dma_mask. |
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**/ |
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void blk_queue_bounce_limit(struct request_queue *q, u64 dma_mask) |
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{ |
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unsigned long b_pfn = dma_mask >> PAGE_SHIFT; |
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int dma = 0; q->bounce_gfp = GFP_NOIO; #if BITS_PER_LONG == 64 |
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/* * 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)) |
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dma = 1; |
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q->limits.bounce_pfn = max_low_pfn; |
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#else |
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if (b_pfn < blk_max_low_pfn) |
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dma = 1; |
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q->limits.bounce_pfn = b_pfn; |
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#endif if (dma) { init_emergency_isa_pool(); q->bounce_gfp = GFP_NOIO | GFP_DMA; |
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q->limits.bounce_pfn = b_pfn; |
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} } |
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EXPORT_SYMBOL(blk_queue_bounce_limit); /** |
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* blk_queue_max_hw_sectors - set max sectors for a request for this queue |
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* @q: the request queue for the device |
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* @max_hw_sectors: max hardware sectors in the usual 512b unit |
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* * Description: |
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* 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. |
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**/ |
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void blk_queue_max_hw_sectors(struct request_queue *q, unsigned int max_hw_sectors) |
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{ |
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if ((max_hw_sectors << 9) < PAGE_CACHE_SIZE) { max_hw_sectors = 1 << (PAGE_CACHE_SHIFT - 9); |
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printk(KERN_INFO "%s: set to minimum %d ", |
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__func__, max_hw_sectors); |
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} |
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q->limits.max_hw_sectors = max_hw_sectors; q->limits.max_sectors = min_t(unsigned int, max_hw_sectors, BLK_DEF_MAX_SECTORS); |
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} |
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EXPORT_SYMBOL(blk_queue_max_hw_sectors); |
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/** |
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* blk_queue_max_discard_sectors - set max sectors for a single discard * @q: the request queue for the device |
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* @max_discard_sectors: maximum number of sectors to discard |
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**/ 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); /** |
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* blk_queue_max_segments - set max hw segments for a request for this queue |
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* @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 |
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* hw data segments in a request. |
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**/ |
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void blk_queue_max_segments(struct request_queue *q, unsigned short max_segments) |
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{ if (!max_segments) { max_segments = 1; |
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printk(KERN_INFO "%s: set to minimum %d ", __func__, max_segments); |
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} |
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q->limits.max_segments = max_segments; |
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} |
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EXPORT_SYMBOL(blk_queue_max_segments); |
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/** * 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; |
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printk(KERN_INFO "%s: set to minimum %d ", __func__, max_size); |
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} |
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q->limits.max_segment_size = max_size; |
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} |
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EXPORT_SYMBOL(blk_queue_max_segment_size); /** |
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* blk_queue_logical_block_size - set logical block size for the queue |
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* @q: the request queue for the device |
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* @size: the logical block size, in bytes |
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* * Description: |
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* This should be set to the lowest possible block size that the * storage device can address. The default of 512 covers most * hardware. |
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**/ |
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void blk_queue_logical_block_size(struct request_queue *q, unsigned short size) |
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{ |
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q->limits.logical_block_size = size; |
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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; |
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} |
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EXPORT_SYMBOL(blk_queue_logical_block_size); |
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|
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/** * 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 |
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* @offset: alignment offset in bytes |
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* * 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); /** |
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* 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); /** |
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* blk_queue_io_min - set minimum request size for the queue * @q: the request queue for the device |
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* @min: smallest I/O size in bytes |
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* * Description: |
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* 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. |
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*/ void blk_queue_io_min(struct request_queue *q, unsigned int min) { |
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blk_limits_io_min(&q->limits, min); |
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} EXPORT_SYMBOL(blk_queue_io_min); /** |
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* 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); /** |
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* blk_queue_io_opt - set optimal request size for the queue * @q: the request queue for the device |
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* @opt: optimal request size in bytes |
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* * Description: |
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* 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. |
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*/ void blk_queue_io_opt(struct request_queue *q, unsigned int opt) { |
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blk_limits_io_opt(&q->limits, opt); |
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} EXPORT_SYMBOL(blk_queue_io_opt); |
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/* * Returns the minimum that is _not_ zero, unless both are zero. */ #define min_not_zero(l, r) (l == 0) ? r : ((r == 0) ? l : min(l, r)) /** * 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) { |
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blk_stack_limits(&t->limits, &b->limits, 0); |
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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); |
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queue_flag_clear(QUEUE_FLAG_CLUSTER, t); |
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spin_unlock_irqrestore(t->queue_lock, flags); } |
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} |
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EXPORT_SYMBOL(blk_queue_stack_limits); /** |
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* blk_stack_limits - adjust queue_limits for stacked devices |
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* @t: the stacking driver limits (top device) * @b: the underlying queue limits (bottom, component device) |
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* @start: first data sector within component device |
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* * Description: |
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* 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. |
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*/ int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, |
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sector_t start) |
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{ |
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unsigned int top, bottom, alignment, ret = 0; |
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|
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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); |
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t->bounce_pfn = min_not_zero(t->bounce_pfn, b->bounce_pfn); |
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t->seg_boundary_mask = min_not_zero(t->seg_boundary_mask, b->seg_boundary_mask); |
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t->max_segments = min_not_zero(t->max_segments, b->max_segments); |
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509 510 511 |
t->max_segment_size = min_not_zero(t->max_segment_size, b->max_segment_size); |
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t->misaligned |= b->misaligned; |
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alignment = queue_limit_alignment_offset(b, start); |
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|
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/* Bottom device has different alignment. Check that it is * compatible with the current top alignment. */ |
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if (t->alignment_offset != alignment) { top = max(t->physical_block_size, t->io_min) + t->alignment_offset; |
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bottom = max(b->physical_block_size, b->io_min) + alignment; |
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|
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/* Verify that top and bottom intervals line up */ |
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if (max(top, bottom) & (min(top, bottom) - 1)) { |
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t->misaligned = 1; |
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ret = -1; } |
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} |
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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); |
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t->io_opt = lcm(t->io_opt, b->io_opt); |
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t->no_cluster |= b->no_cluster; |
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t->discard_zeroes_data &= b->discard_zeroes_data; |
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|
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/* Physical block size a multiple of the logical block size? */ |
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if (t->physical_block_size & (t->logical_block_size - 1)) { t->physical_block_size = t->logical_block_size; |
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t->misaligned = 1; |
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ret = -1; |
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} |
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/* Minimum I/O a multiple of the physical block size? */ |
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if (t->io_min & (t->physical_block_size - 1)) { t->io_min = t->physical_block_size; t->misaligned = 1; |
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ret = -1; |
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} |
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/* Optimal I/O a multiple of the physical block size? */ |
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if (t->io_opt & (t->physical_block_size - 1)) { t->io_opt = 0; t->misaligned = 1; |
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557 |
ret = -1; |
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} |
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559 |
|
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/* Find lowest common alignment_offset */ |
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t->alignment_offset = lcm(t->alignment_offset, alignment) & (max(t->physical_block_size, t->io_min) - 1); |
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|
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564 |
/* Verify that new alignment_offset is on a logical block boundary */ |
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if (t->alignment_offset & (t->logical_block_size - 1)) { |
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t->misaligned = 1; |
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ret = -1; } |
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569 |
|
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/* Discard alignment and granularity */ if (b->discard_granularity) { |
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alignment = queue_limit_discard_alignment(b, start); |
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if (t->discard_granularity != 0 && t->discard_alignment != alignment) { top = t->discard_granularity + t->discard_alignment; bottom = b->discard_granularity + alignment; |
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|
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/* Verify that top and bottom intervals line up */ if (max(top, bottom) & (min(top, bottom) - 1)) t->discard_misaligned = 1; } |
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t->max_discard_sectors = min_not_zero(t->max_discard_sectors, b->max_discard_sectors); |
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t->discard_granularity = max(t->discard_granularity, b->discard_granularity); t->discard_alignment = lcm(t->discard_alignment, alignment) & (t->discard_granularity - 1); } |
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|
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return ret; |
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592 |
} |
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EXPORT_SYMBOL(blk_stack_limits); |
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/** |
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* 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); |
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return blk_stack_limits(t, &bq->limits, start); |
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} EXPORT_SYMBOL(bdev_stack_limits); /** |
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* disk_stack_limits - adjust queue limits for stacked drivers |
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* @disk: MD/DM gendisk (top) |
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* @bdev: the underlying block device (bottom) * @offset: offset to beginning of data within component device * * Description: |
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* Merges the limits for a top level gendisk and a bottom level * block_device. |
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*/ 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); |
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if (bdev_stack_limits(&t->limits, bdev, offset >> 9) < 0) { |
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632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 |
char top[BDEVNAME_SIZE], bottom[BDEVNAME_SIZE]; disk_name(disk, 0, top); bdevname(bdev, bottom); printk(KERN_NOTICE "%s: Warning: Device %s is misaligned ", 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); /** |
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* blk_queue_dma_pad - set pad mask * @q: the request queue for the device * @mask: pad mask * |
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* Set dma pad mask. |
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* |
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* Appending pad buffer to a request modifies the last entry of a * scatter list such that it includes the pad buffer. |
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**/ void blk_queue_dma_pad(struct request_queue *q, unsigned int mask) { q->dma_pad_mask = mask; } EXPORT_SYMBOL(blk_queue_dma_pad); /** |
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* 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); /** |
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* blk_queue_dma_drain - Set up a drain buffer for excess dma. |
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* @q: the request queue for the device |
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* @dma_drain_needed: fn which returns non-zero if drain is necessary |
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* @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. * |
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* 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. |
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*/ |
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int blk_queue_dma_drain(struct request_queue *q, |
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710 711 |
dma_drain_needed_fn *dma_drain_needed, void *buf, unsigned int size) |
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{ |
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713 |
if (queue_max_segments(q) < 2) |
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714 715 |
return -EINVAL; /* make room for appending the drain */ |
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716 |
blk_queue_max_segments(q, queue_max_segments(q) - 1); |
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717 |
q->dma_drain_needed = dma_drain_needed; |
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718 719 720 721 722 |
q->dma_drain_buffer = buf; q->dma_drain_size = size; return 0; } |
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723 724 725 726 727 728 729 730 731 732 733 |
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; |
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printk(KERN_INFO "%s: set to minimum %lx ", __func__, mask); |
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} |
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738 |
q->limits.seg_boundary_mask = mask; |
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739 |
} |
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740 741 742 743 744 745 746 747 |
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: |
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748 |
* set required memory and length alignment for direct dma transactions. |
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749 |
* this is used when building direct io requests for the queue. |
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* **/ void blk_queue_dma_alignment(struct request_queue *q, int mask) { q->dma_alignment = mask; } |
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756 757 758 759 760 761 762 763 |
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: |
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764 |
* update required memory and length alignment for direct dma transactions. |
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765 766 767 768 769 770 771 772 773 774 775 776 777 778 |
* 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; } |
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779 |
EXPORT_SYMBOL(blk_queue_update_dma_alignment); |
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static int __init blk_settings_init(void) |
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781 782 783 784 785 786 |
{ blk_max_low_pfn = max_low_pfn - 1; blk_max_pfn = max_pfn - 1; return 0; } subsys_initcall(blk_settings_init); |