diff options
Diffstat (limited to 'block/blk-lib.c')
| -rw-r--r-- | block/blk-lib.c | 45 |
1 files changed, 35 insertions, 10 deletions
diff --git a/block/blk-lib.c b/block/blk-lib.c index 9d2ab8bba52a..f625fda5f095 100644 --- a/block/blk-lib.c +++ b/block/blk-lib.c @@ -321,12 +321,6 @@ static int __blkdev_issue_zero_pages(struct block_device *bdev, * Zero-fill a block range, either using hardware offload or by explicitly * writing zeroes to the device. * - * Note that this function may fail with -EOPNOTSUPP if the driver signals - * zeroing offload support, but the device fails to process the command (for - * some devices there is no non-destructive way to verify whether this - * operation is actually supported). In this case the caller should call - * retry the call to blkdev_issue_zeroout() and the fallback path will be used. - * * If a device is using logical block provisioning, the underlying space will * not be released if %flags contains BLKDEV_ZERO_NOUNMAP. * @@ -370,18 +364,49 @@ EXPORT_SYMBOL(__blkdev_issue_zeroout); int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, sector_t nr_sects, gfp_t gfp_mask, unsigned flags) { - int ret; - struct bio *bio = NULL; + int ret = 0; + sector_t bs_mask; + struct bio *bio; struct blk_plug plug; + bool try_write_zeroes = !!bdev_write_zeroes_sectors(bdev); + bs_mask = (bdev_logical_block_size(bdev) >> 9) - 1; + if ((sector | nr_sects) & bs_mask) + return -EINVAL; + +retry: + bio = NULL; blk_start_plug(&plug); - ret = __blkdev_issue_zeroout(bdev, sector, nr_sects, gfp_mask, - &bio, flags); + if (try_write_zeroes) { + ret = __blkdev_issue_write_zeroes(bdev, sector, nr_sects, + gfp_mask, &bio, flags); + } else if (!(flags & BLKDEV_ZERO_NOFALLBACK)) { + ret = __blkdev_issue_zero_pages(bdev, sector, nr_sects, + gfp_mask, &bio); + } else { + /* No zeroing offload support */ + ret = -EOPNOTSUPP; + } if (ret == 0 && bio) { ret = submit_bio_wait(bio); bio_put(bio); } blk_finish_plug(&plug); + if (ret && try_write_zeroes) { + if (!(flags & BLKDEV_ZERO_NOFALLBACK)) { + try_write_zeroes = false; + goto retry; + } + if (!bdev_write_zeroes_sectors(bdev)) { + /* + * Zeroing offload support was indicated, but the + * device reported ILLEGAL REQUEST (for some devices + * there is no non-destructive way to verify whether + * WRITE ZEROES is actually supported). + */ + ret = -EOPNOTSUPP; + } + } return ret; } |