From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Christoph Hellwig To: linux-fsdevel@vger.kernel.org, linux-xfs@vger.kernel.org, linux-block@vger.kernel.org Subject: [PATCH 11/12] block_dev: implement the F_IOINFO fcntl Date: Tue, 28 Feb 2017 06:57:36 -0800 Message-Id: <20170228145737.19016-12-hch@lst.de> In-Reply-To: <20170228145737.19016-1-hch@lst.de> References: <20170228145737.19016-1-hch@lst.de> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: Signed-off-by: Christoph Hellwig --- fs/block_dev.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/fs/block_dev.c b/fs/block_dev.c index 4dd5c54cdefb..48a799964e1d 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -2116,6 +2116,26 @@ static long blkdev_fallocate(struct file *file, int mode, loff_t start, end >> PAGE_SHIFT); } +static int blkdev_ioinfo(struct file *file, struct fcntl_ioinfo *fio) +{ + struct block_device *bdev = I_BDEV(bdev_file_inode(file)); + struct request_queue *q = bdev_get_queue(bdev); + unsigned int atomic_sectors = queue_max_atomic_write_sectors(q); + + if (file->f_flags & O_DIRECT) { + fio->fio_alignment = bdev_logical_block_size(bdev); + + if ((file->f_flags & O_ATOMIC) && atomic_sectors) { + fio->fio_flags = FIO_FL_ATOMIC_OSYNC; + fio->fio_max_atomic = (atomic_sectors << 9); + if (fio->fio_alignment) + fio->fio_max_atomic &= ~(fio->fio_alignment - 1); + } + } + + return 0; +}; + const struct file_operations def_blk_fops = { .open = blkdev_open, .release = blkdev_close, @@ -2131,6 +2151,7 @@ const struct file_operations def_blk_fops = { .splice_read = generic_file_splice_read, .splice_write = iter_file_splice_write, .fallocate = blkdev_fallocate, + .ioinfo = blkdev_ioinfo, }; int ioctl_by_bdev(struct block_device *bdev, unsigned cmd, unsigned long arg) -- 2.11.0