shinys000114/linux
1
0
Fork 0
mirror of https://github.com/hardkernel/linux.git synced 2026-06-08 20:07:46 +09:00
Code Issues Packages Projects Releases Wiki Activity

iomap: support direct I/O with fscrypt using blk-crypto

Browse Source 
Encrypted files traditionally haven't supported DIO, due to the need to
encrypt/decrypt the data.  However, when the encryption is implemented
using inline encryption (blk-crypto) instead of the traditional
filesystem-layer encryption, it is straightforward to support DIO.

Add support for this to the iomap DIO implementation by calling
fscrypt_set_bio_crypt_ctx() to set encryption contexts on the bios.

Don't check for the rare case where a DUN (crypto data unit number)
discontiguity creates a boundary that bios must not cross.  Instead,
filesystems are expected to handle this in ->iomap_begin() by limiting
the length of the mapping so that iomap doesn't have to worry about it.

Co-developed-by: Satya Tangirala <satyat@google.com>
Signed-off-by: Satya Tangirala <satyat@google.com>
Acked-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220128233940.79464-3-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
This commit is contained in:
Eric Biggers
2022-01-28 15:39:37 -08:00
committed by Jaegeuk Kim
parent b6da748bab
commit 4b613cb0c4
1 changed files with 6 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
fs/iomap/direct-io.c
View File

@@ -6,6 +6,7 @@
#include <linux/module.h> #include <linux/module.h>
#include <linux/compiler.h> #include <linux/compiler.h>
#include <linux/fs.h> #include <linux/fs.h>
#include <linux/fscrypt.h>
#include <linux/iomap.h> #include <linux/iomap.h>
#include <linux/backing-dev.h> #include <linux/backing-dev.h>
#include <linux/uio.h> #include <linux/uio.h>
@@ -185,11 +186,14 @@ static void
iomap_dio_zero(struct iomap_dio *dio, struct iomap *iomap, loff_t pos, iomap_dio_zero(struct iomap_dio *dio, struct iomap *iomap, loff_t pos,
unsigned len) unsigned len)
{ {
struct inode *inode = file_inode(dio->iocb->ki_filp);
struct page *page = ZERO_PAGE(0); struct page *page = ZERO_PAGE(0);
int flags = REQ_SYNC | REQ_IDLE; int flags = REQ_SYNC | REQ_IDLE;
struct bio *bio; struct bio *bio;
bio = bio_alloc(GFP_KERNEL, 1); 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_set_dev(bio, iomap->bdev);
bio->bi_iter.bi_sector = iomap_sector(iomap, pos); bio->bi_iter.bi_sector = iomap_sector(iomap, pos);
bio->bi_private = dio; bio->bi_private = dio;
@@ -272,6 +276,8 @@ iomap_dio_bio_actor(struct inode *inode, loff_t pos, loff_t length,
} }
bio = bio_alloc(GFP_KERNEL, nr_pages); 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_set_dev(bio, iomap->bdev);
bio->bi_iter.bi_sector = iomap_sector(iomap, pos); bio->bi_iter.bi_sector = iomap_sector(iomap, pos);
bio->bi_write_hint = dio->iocb->ki_hint; bio->bi_write_hint = dio->iocb->ki_hint;