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

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@google.com>
Co-developed-by: Satya Tangirala <satyat@google.com>
Signed-off-by: Satya Tangirala <satyat@google.com>

Bug: 162255927
Link: https://lore.kernel.org/r/20200724184501.1651378-4-satyat@google.com
Change-Id: I34bd73001d53c854b5905799d3a9c31762914763
Signed-off-by: Eric Biggers <ebiggers@google.com>
This commit is contained in:
Eric Biggers 2020-07-24 18:44:57 +00:00 committed by Greg Kroah-Hartman
parent 1aa65ee10d
commit 89d89a9580
1 changed files with 6 additions and 0 deletions
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6
fs/iomap/direct-io.c
View File

@ -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;
@ -308,6 +312,8 @@ 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;