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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 <[email protected]>
Acked-by: Jens Axboe <[email protected]>
Cc: Kyungmin Park <[email protected]>
Cc: Madhusudhan Chikkature <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Ben Gardiner <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Adrian Hunter 2010-08-11 14:17:49 -07:00 • committed by Linus Torvalds
commit 8d57a98ccd
9 changed files with 45 additions and 7 deletions
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6
block/blk-lib.c
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@ -62,6 +62,12 @@ int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
max_discard_sectors &= ~(disc_sects - 1);
}
if (flags & BLKDEV_IFL_SECURE) {
if (!blk_queue_secdiscard(q))
return -EOPNOTSUPP;
type |= DISCARD_SECURE;
}
while (nr_sects && !ret) {
bio = bio_alloc(gfp_mask, 1);
if (!bio) {