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| author | Christoph Hellwig <hch@lst.de> | 2017-01-13 15:18:16 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2017-01-13 15:18:16 -0700 |
| commit | bef13315e990fd3d3fb4c39013aefd53f06c3657 (patch) | |
| tree | 25101dd0c76363c670fd08f947ef46df48285e28 /block | |
| parent | f80de881d8df967488b7343381619efa15019493 (diff) | |
| download | linux-bef13315e990fd3d3fb4c39013aefd53f06c3657.tar.gz linux-bef13315e990fd3d3fb4c39013aefd53f06c3657.tar.bz2 linux-bef13315e990fd3d3fb4c39013aefd53f06c3657.zip | |
block: don't try to discard from __blkdev_issue_zeroout
Discard can return -EIO asynchronously if the alignment for the request
isn't suitable for the driver, which makes a proper fallback to other
methods in __blkdev_issue_zeroout impossible. Thus only issue a sync
discard from blkdev_issue_zeroout an don't try discard at all from
__blkdev_issue_zeroout as a non-invasive workaround.
One more reason why abusing discard for zeroing must die..
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reported-by: Eryu Guan <eguan@redhat.com>
Fixes: e73c23ff ("block: add async variant of blkdev_issue_zeroout")
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-lib.c | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/block/blk-lib.c b/block/blk-lib.c index ed89c8f4b2a0..f8c82a9b4012 100644 --- a/block/blk-lib.c +++ b/block/blk-lib.c @@ -301,13 +301,6 @@ int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, if ((sector | nr_sects) & bs_mask) return -EINVAL; - if (discard) { - ret = __blkdev_issue_discard(bdev, sector, nr_sects, gfp_mask, - BLKDEV_DISCARD_ZERO, biop); - if (ret == 0 || (ret && ret != -EOPNOTSUPP)) - goto out; - } - ret = __blkdev_issue_write_zeroes(bdev, sector, nr_sects, gfp_mask, biop); if (ret == 0 || (ret && ret != -EOPNOTSUPP)) @@ -370,6 +363,12 @@ int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, struct bio *bio = NULL; struct blk_plug plug; + if (discard) { + if (!blkdev_issue_discard(bdev, sector, nr_sects, gfp_mask, + BLKDEV_DISCARD_ZERO)) + return 0; + } + blk_start_plug(&plug); ret = __blkdev_issue_zeroout(bdev, sector, nr_sects, gfp_mask, &bio, discard); |