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| author | Christoph Hellwig <hch@lst.de> | 2016-07-19 11:23:33 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2016-07-20 17:35:20 -0600 |
| commit | e950fdf71c9b4a6b63b58fed78956a96cc907402 (patch) | |
| tree | eadcf71a0abf034caaab5b019fe8f290df7fbc14 /include/linux/blkdev.h | |
| parent | b09dcf585df959cf26270e65941ea1f79a1345aa (diff) | |
| download | linux-e950fdf71c9b4a6b63b58fed78956a96cc907402.tar.gz linux-e950fdf71c9b4a6b63b58fed78956a96cc907402.tar.bz2 linux-e950fdf71c9b4a6b63b58fed78956a96cc907402.zip | |
block: introduce BLKDEV_DISCARD_ZERO to fix zeroout
Currently blkdev_issue_zeroout cascades down from discards (if the driver
guarantees that discards zero data), to WRITE SAME and then to a loop
writing zeroes. Unfortunately we ignore run-time EOPNOTSUPP errors in the
block layer blkdev_issue_discard helper to work around DM volumes that
may have mixed discard support underneath.
This patch intoroduces a new BLKDEV_DISCARD_ZERO flag to
blkdev_issue_discard that indicates we are called for zeroing operation.
This allows both to ignore the EOPNOTSUPP hack and actually consolidating
the discard_zeroes_data check into the function.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'include/linux/blkdev.h')
| -rw-r--r-- | include/linux/blkdev.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 53fee6123893..156455cb07ad 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1137,7 +1137,9 @@ static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, return bqt->tag_index[tag]; } -#define BLKDEV_DISCARD_SECURE 0x01 /* secure discard */ + +#define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */ +#define BLKDEV_DISCARD_ZERO (1 << 1) /* must reliably zero data */ extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *); extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, |