block_dev: use blkdev_issue_zerout for hole punches
This gets us support for non-discard efficient write of zeroes (e.g. NVMe) and prepares for removing the discard_zeroes_data flag. Also remove a pointless discard support check, which is done in blkdev_issue_discard already. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Jens Axboe <axboe@fb.com>
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@ -2069,7 +2069,6 @@ static long blkdev_fallocate(struct file *file, int mode, loff_t start,
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loff_t len)
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{
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struct block_device *bdev = I_BDEV(bdev_file_inode(file));
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struct request_queue *q = bdev_get_queue(bdev);
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struct address_space *mapping;
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loff_t end = start + len - 1;
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loff_t isize;
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@ -2108,15 +2107,10 @@ static long blkdev_fallocate(struct file *file, int mode, loff_t start,
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GFP_KERNEL, BLKDEV_ZERO_NOUNMAP);
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break;
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case FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE:
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/* Only punch if the device can do zeroing discard. */
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if (!blk_queue_discard(q) || !q->limits.discard_zeroes_data)
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return -EOPNOTSUPP;
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error = blkdev_issue_discard(bdev, start >> 9, len >> 9,
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GFP_KERNEL, 0);
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error = blkdev_issue_zeroout(bdev, start >> 9, len >> 9,
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GFP_KERNEL, BLKDEV_ZERO_NOFALLBACK);
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break;
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case FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE | FALLOC_FL_NO_HIDE_STALE:
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if (!blk_queue_discard(q))
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return -EOPNOTSUPP;
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error = blkdev_issue_discard(bdev, start >> 9, len >> 9,
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GFP_KERNEL, 0);
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break;
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