diff options
| -rw-r--r-- | block/blk-lib.c | 30 | ||||
| -rw-r--r-- | block/ioctl.c | 2 | ||||
| -rw-r--r-- | drivers/block/drbd/drbd_receiver.c | 2 | ||||
| -rw-r--r-- | include/linux/blkdev.h | 4 |
4 files changed, 30 insertions, 8 deletions
diff --git a/block/blk-lib.c b/block/blk-lib.c index 8411be3..715e948 100644 --- a/block/blk-lib.c +++ b/block/blk-lib.c @@ -283,23 +283,45 @@ static int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, * @sector: start sector * @nr_sects: number of sectors to write * @gfp_mask: memory allocation flags (for bio_alloc) + * @discard: whether to discard the block range * * Description: - * Generate and issue number of bios with zerofiled pages. + + * 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 the WRITE SAME command + * 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. */ int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, - sector_t nr_sects, gfp_t gfp_mask) + sector_t nr_sects, gfp_t gfp_mask, bool discard) { + struct request_queue *q = bdev_get_queue(bdev); + unsigned char bdn[BDEVNAME_SIZE]; + + if (discard && blk_queue_discard(q) && q->limits.discard_zeroes_data) { + + if (!blkdev_issue_discard(bdev, sector, nr_sects, gfp_mask, 0)) + return 0; + + bdevname(bdev, bdn); + pr_warn("%s: DISCARD failed. Manually zeroing.\n", bdn); + } + if (bdev_write_same(bdev)) { - unsigned char bdn[BDEVNAME_SIZE]; if (!blkdev_issue_write_same(bdev, sector, nr_sects, gfp_mask, ZERO_PAGE(0))) return 0; bdevname(bdev, bdn); - pr_err("%s: WRITE SAME failed. Manually zeroing.\n", bdn); + pr_warn("%s: WRITE SAME failed. Manually zeroing.\n", bdn); } return __blkdev_issue_zeroout(bdev, sector, nr_sects, gfp_mask); diff --git a/block/ioctl.c b/block/ioctl.c index 6c7bf90..7d8befd 100644 --- a/block/ioctl.c +++ b/block/ioctl.c @@ -198,7 +198,7 @@ static int blk_ioctl_zeroout(struct block_device *bdev, uint64_t start, if (start + len > (i_size_read(bdev->bd_inode) >> 9)) return -EINVAL; - return blkdev_issue_zeroout(bdev, start, len, GFP_KERNEL); + return blkdev_issue_zeroout(bdev, start, len, GFP_KERNEL, false); } static int put_ushort(unsigned long arg, unsigned short val) diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c index d169b4a..cee2035 100644 --- a/drivers/block/drbd/drbd_receiver.c +++ b/drivers/block/drbd/drbd_receiver.c @@ -1388,7 +1388,7 @@ int drbd_submit_peer_request(struct drbd_device *device, list_add_tail(&peer_req->w.list, &device->active_ee); spin_unlock_irq(&device->resource->req_lock); if (blkdev_issue_zeroout(device->ldev->backing_bdev, - sector, data_size >> 9, GFP_NOIO)) + sector, data_size >> 9, GFP_NOIO, false)) peer_req->flags |= EE_WAS_ERROR; drbd_endio_write_sec_final(peer_req); return 0; diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index e9086be..4c4b732 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1162,7 +1162,7 @@ extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector, sector_t nr_sects, gfp_t gfp_mask, struct page *page); extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, - sector_t nr_sects, gfp_t gfp_mask); + sector_t nr_sects, gfp_t gfp_mask, bool discard); static inline int sb_issue_discard(struct super_block *sb, sector_t block, sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) { @@ -1176,7 +1176,7 @@ static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, return blkdev_issue_zeroout(sb->s_bdev, block << (sb->s_blocksize_bits - 9), nr_blocks << (sb->s_blocksize_bits - 9), - gfp_mask); + gfp_mask, true); } extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm); |
