Re: [PATCH v9 6/9] iomap: support direct I/O with fscrypt using blk-crypto

[Darrick J. Wong]

On Fri, Jun 04, 2021 at 09:09:05PM +0000, Satya Tangirala wrote:
> From: Eric Biggers <ebiggers@xxxxxxxxxx>
> 
> Set bio crypt contexts on bios by calling into fscrypt when required.
> No DUN contiguity checks are done - callers are expected to set up the
> iomap correctly to ensure that each bio submitted by iomap will not have
> blocks with incontiguous DUNs by calling fscrypt_limit_io_blocks()
> appropriately.
> 
> Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
> Co-developed-by: Satya Tangirala <satyat@xxxxxxxxxx>
> Signed-off-by: Satya Tangirala <satyat@xxxxxxxxxx>

Looks like a straightforward conversion...

Acked-by: Darrick J. Wong <djwong@xxxxxxxxxx>

--D

> ---
>  fs/iomap/direct-io.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c
> index 9398b8c31323..1c825deb36a9 100644
> --- a/fs/iomap/direct-io.c
> +++ b/fs/iomap/direct-io.c
> @@ -6,6 +6,7 @@
>  #include <linux/module.h>
>  #include <linux/compiler.h>
>  #include <linux/fs.h>
> +#include <linux/fscrypt.h>
>  #include <linux/iomap.h>
>  #include <linux/backing-dev.h>
>  #include <linux/uio.h>
> @@ -185,11 +186,14 @@ static void
>  iomap_dio_zero(struct iomap_dio *dio, struct iomap *iomap, loff_t pos,
>  		unsigned len)
>  {
> +	struct inode *inode = file_inode(dio->iocb->ki_filp);
>  	struct page *page = ZERO_PAGE(0);
>  	int flags = REQ_SYNC | REQ_IDLE;
>  	struct bio *bio;
>  
>  	bio = bio_alloc(GFP_KERNEL, 1);
> +	fscrypt_set_bio_crypt_ctx(bio, inode, pos >> inode->i_blkbits,
> +				  GFP_KERNEL);
>  	bio_set_dev(bio, iomap->bdev);
>  	bio->bi_iter.bi_sector = iomap_sector(iomap, pos);
>  	bio->bi_private = dio;
> @@ -306,6 +310,8 @@ iomap_dio_bio_actor(struct inode *inode, loff_t pos, loff_t length,
>  		}
>  
>  		bio = bio_alloc(GFP_KERNEL, nr_pages);
> +		fscrypt_set_bio_crypt_ctx(bio, inode, pos >> inode->i_blkbits,
> +					  GFP_KERNEL);
>  		bio_set_dev(bio, iomap->bdev);
>  		bio->bi_iter.bi_sector = iomap_sector(iomap, pos);
>  		bio->bi_write_hint = dio->iocb->ki_hint;
> -- 
> 2.32.0.rc1.229.g3e70b5a671-goog
>