table of contents
BLKDEV_ISSUE_ZEROOUT(9) | Block Devices | BLKDEV_ISSUE_ZEROOUT(9) |
NAME¶
blkdev_issue_zeroout - zero-fill a block range
SYNOPSIS¶
int blkdev_issue_zeroout(struct block_device * bdev, sector_t sector, sector_t nr_sects, gfp_t gfp_mask, bool discard);
ARGUMENTS¶
struct block_device * bdev
sector_t sector
sector_t nr_sects
gfp_t gfp_mask
bool discard
DESCRIPTION¶
Zero-fill a block range. If the discard flag is set and the block device guarantees that subsequent READ operations to the block range in question will return zeroes, the blocks will be discarded. Should the discard request fail, if the discard flag is not set, or if discard_zeroes_data is not supported, this function will resort to zeroing the blocks manually, thus provisioning (allocating, anchoring) them. If the block device supports WRITE ZEROES or WRITE SAME command(s), blkdev_issue_zeroout will use it to optimize the process of clearing the block range. Otherwise the zeroing will be performed using regular WRITE calls.
COPYRIGHT¶
June 2017 | Kernel Hackers Manual 4.11 |