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-rw-r--r--block/blk-settings.c24
1 files changed, 20 insertions, 4 deletions
diff --git a/block/blk-settings.c b/block/blk-settings.c
index 8dd86418f35d..dfc77012843f 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -302,11 +302,10 @@ EXPORT_SYMBOL(blk_queue_stack_limits);
302 * @q: the request queue for the device 302 * @q: the request queue for the device
303 * @mask: pad mask 303 * @mask: pad mask
304 * 304 *
305 * Set pad mask. Direct IO requests are padded to the mask specified. 305 * Set dma pad mask.
306 * 306 *
307 * Appending pad buffer to a request modifies ->data_len such that it 307 * Appending pad buffer to a request modifies the last entry of a
308 * includes the pad buffer. The original requested data length can be 308 * scatter list such that it includes the pad buffer.
309 * obtained using blk_rq_raw_data_len().
310 **/ 309 **/
311void blk_queue_dma_pad(struct request_queue *q, unsigned int mask) 310void blk_queue_dma_pad(struct request_queue *q, unsigned int mask)
312{ 311{
@@ -315,6 +314,23 @@ void blk_queue_dma_pad(struct request_queue *q, unsigned int mask)
315EXPORT_SYMBOL(blk_queue_dma_pad); 314EXPORT_SYMBOL(blk_queue_dma_pad);
316 315
317/** 316/**
317 * blk_queue_update_dma_pad - update pad mask
318 * @q: the request queue for the device
319 * @mask: pad mask
320 *
321 * Update dma pad mask.
322 *
323 * Appending pad buffer to a request modifies the last entry of a
324 * scatter list such that it includes the pad buffer.
325 **/
326void blk_queue_update_dma_pad(struct request_queue *q, unsigned int mask)
327{
328 if (mask > q->dma_pad_mask)
329 q->dma_pad_mask = mask;
330}
331EXPORT_SYMBOL(blk_queue_update_dma_pad);
332
333/**
318 * blk_queue_dma_drain - Set up a drain buffer for excess dma. 334 * blk_queue_dma_drain - Set up a drain buffer for excess dma.
319 * @q: the request queue for the device 335 * @q: the request queue for the device
320 * @dma_drain_needed: fn which returns non-zero if drain is necessary 336 * @dma_drain_needed: fn which returns non-zero if drain is necessary