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| author | Mike Snitzer <snitzer@redhat.com> | 2016-05-05 11:54:21 -0400 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2016-05-05 13:03:26 -0600 |
| commit | bbd848e0fade51ae51dab86a0683069cef89953f (patch) | |
| tree | 1f3a5d8107fe664a19ebddf4f656b0f50fe267b5 | |
| parent | a21f2a3ec62abe2e06500d6550659a0ff5624fbb (diff) | |
| download | linux-bbd848e0fade51ae51dab86a0683069cef89953f.tar.bz2 | |
block: reinstate early return of -EOPNOTSUPP from blkdev_issue_discard
Commit 38f25255330 ("block: add __blkdev_issue_discard") incorrectly
disallowed the early return of -EOPNOTSUPP if the device doesn't support
discard (or secure discard). This early return of -EOPNOTSUPP has
always been part of blkdev_issue_discard() interface so there isn't a
good reason to break that behaviour -- especially when it can be easily
reinstated.
The nuance of allowing early return of -EOPNOTSUPP vs disallowing late
return of -EOPNOTSUPP is: if the overall device never advertised support
for discards and one is issued to the device it is beneficial to inform
the caller that discards are not supported via -EOPNOTSUPP. But if a
device advertises discard support it means that at least a subset of the
device does have discard support -- but it could be that discards issued
to some regions of a stacked device will not be supported. In that case
the late return of -EOPNOTSUPP must be disallowed.
Fixes: 38f25255330 ("block: add __blkdev_issue_discard")
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
| -rw-r--r-- | block/blk-lib.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/block/blk-lib.c b/block/blk-lib.c index ccbce2b2ea05..23d7f301a196 100644 --- a/block/blk-lib.c +++ b/block/blk-lib.c @@ -109,11 +109,14 @@ int blkdev_issue_discard(struct block_device *bdev, sector_t sector, blk_start_plug(&plug); ret = __blkdev_issue_discard(bdev, sector, nr_sects, gfp_mask, type, &bio); - if (!ret && bio) + if (!ret && bio) { ret = submit_bio_wait(type, bio); + if (ret == -EOPNOTSUPP) + ret = 0; + } blk_finish_plug(&plug); - return ret != -EOPNOTSUPP ? ret : 0; + return ret; } EXPORT_SYMBOL(blkdev_issue_discard); |