diff options
| author | Adrian Hunter <adrian.hunter@nokia.com> | 2010-08-11 14:17:50 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-08-12 08:43:30 -0700 |
| commit | 4980454868af4b2f84f1f15f4b76512eecb37e1d (patch) | |
| tree | c8480c25797558d44f39fdbec2e8a4b22f47c729 /drivers/mmc/card/block.c | |
| parent | 8d57a98ccd0b4489003473979da8f5a1363ba7a3 (diff) | |
mmc_block: add support for secure discard
Secure discard is implemented by Secure Trim if the discard is unaligned
or Secure Erase otherwise.
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>
Diffstat (limited to 'drivers/mmc/card/block.c')
| -rw-r--r-- | drivers/mmc/card/block.c | 46 |
1 files changed, 43 insertions, 3 deletions
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c index 03f96e975fe..d545f79f600 100644 --- a/drivers/mmc/card/block.c +++ b/drivers/mmc/card/block.c @@ -280,6 +280,42 @@ out: return err ? 0 : 1; } +static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq, + struct request *req) +{ + struct mmc_blk_data *md = mq->data; + struct mmc_card *card = md->queue.card; + unsigned int from, nr, arg; + int err = 0; + + mmc_claim_host(card->host); + + if (!mmc_can_secure_erase_trim(card)) { + err = -EOPNOTSUPP; + goto out; + } + + from = blk_rq_pos(req); + nr = blk_rq_sectors(req); + + if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr)) + arg = MMC_SECURE_TRIM1_ARG; + else + arg = MMC_SECURE_ERASE_ARG; + + err = mmc_erase(card, from, nr, arg); + if (!err && arg == MMC_SECURE_TRIM1_ARG) + err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG); +out: + spin_lock_irq(&md->lock); + __blk_end_request(req, err, blk_rq_bytes(req)); + spin_unlock_irq(&md->lock); + + mmc_release_host(card->host); + + return err ? 0 : 1; +} + static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *req) { struct mmc_blk_data *md = mq->data; @@ -510,10 +546,14 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *req) static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req) { - if (req->cmd_flags & REQ_DISCARD) - return mmc_blk_issue_discard_rq(mq, req); - else + if (req->cmd_flags & REQ_DISCARD) { + if (req->cmd_flags & REQ_SECURE) + return mmc_blk_issue_secdiscard_rq(mq, req); + else + return mmc_blk_issue_discard_rq(mq, req); + } else { return mmc_blk_issue_rw_rq(mq, req); + } } static inline int mmc_blk_readonly(struct mmc_card *card) |