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block: add secure discard

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Secure discard is the same as discard except that all copies of the
discarded sectors (perhaps created by garbage collection) must also be
erased.

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 14:17:49 -07:00
committed by Linus Torvalds
parent 93caf8e69e
commit 8d57a98ccd
9 changed files with 45 additions and 7 deletions
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8
kernel/trace/blktrace.c
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@@ -710,6 +710,9 @@ static void blk_add_trace_rq(struct request_queue *q, struct request *rq,
if (rq->cmd_flags & REQ_DISCARD)
rw |= REQ_DISCARD;
if (rq->cmd_flags & REQ_SECURE)
rw |= REQ_SECURE;
if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
what |= BLK_TC_ACT(BLK_TC_PC);
__blk_add_trace(bt, 0, blk_rq_bytes(rq), rw,
@@ -1816,6 +1819,8 @@ void blk_fill_rwbs(char *rwbs, u32 rw, int bytes)
rwbs[i++] = 'S';
if (rw & REQ_META)
rwbs[i++] = 'M';
if (rw & REQ_SECURE)
rwbs[i++] = 'E';
rwbs[i] = '\0';
}
@@ -1828,6 +1833,9 @@ void blk_fill_rwbs_rq(char *rwbs, struct request *rq)
if (rq->cmd_flags & REQ_DISCARD)
rw |= REQ_DISCARD;
if (rq->cmd_flags & REQ_SECURE)
rw |= REQ_SECURE;
bytes = blk_rq_bytes(rq);
blk_fill_rwbs(rwbs, rw, bytes);