TWxSoftware/twx-linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

mmc_block: add discard support

Browse Source 
Enable MMC to service discard requests.  In the case of SD and MMC cards
that do not support trim, discards become erases.  In the case of cards
(MMC) that only allow erases in multiples of erase group size, round to
the nearest completely discarded erase group.

Signed-off-by: Adrian Hunter <adrian.hunter@nokia.com>
Acked-by: Jens Axboe <axboe@kernel.dk>
Cc: Kyungmin Park <kmpark@infradead.org>
Cc: Madhusudhan Chikkature <madhu.cr@ti.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Ben Gardiner <bengardiner@nanometrics.ca>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Adrian Hunter
2010-08-11 14:17:47 -07:00
committed by Linus Torvalds
parent dfe86cba76
commit bd788c9665
2 changed files with 55 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/mmc/card/queue.c
+14 -2
View File
@@ -30,9 +30,9 @@
static int mmc_prep_request(struct request_queue *q, struct request *req)
{
/*
* We only like normal block requests.
* We only like normal block requests and discards.
*/
if (req->cmd_type != REQ_TYPE_FS) {
if (req->cmd_type != REQ_TYPE_FS && !(req->cmd_flags & REQ_DISCARD)) {
blk_dump_rq_flags(req, "MMC bad request");
return BLKPREP_KILL;
}
@@ -130,6 +130,18 @@ int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card, spinlock_t *lock
blk_queue_prep_rq(mq->queue, mmc_prep_request);
blk_queue_ordered(mq->queue, QUEUE_ORDERED_DRAIN);
queue_flag_set_unlocked(QUEUE_FLAG_NONROT, mq->queue);
if (mmc_can_erase(card)) {
queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mq->queue);
mq->queue->limits.max_discard_sectors = UINT_MAX;
if (card->erased_byte == 0)
mq->queue->limits.discard_zeroes_data = 1;
if (!mmc_can_trim(card) && is_power_of_2(card->erase_size)) {
mq->queue->limits.discard_granularity =
card->erase_size << 9;
mq->queue->limits.discard_alignment =
card->erase_size << 9;
}
}
#ifdef CONFIG_MMC_BLOCK_BOUNCE
if (host->max_hw_segs == 1) {