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iomap: support direct I/O with fscrypt using blk-crypto
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>
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1 changed files with 6 additions and 0 deletions
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@ -6,6 +6,7 @@
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#include <linux/module.h>
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#include <linux/module.h>
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#include <linux/compiler.h>
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#include <linux/compiler.h>
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#include <linux/fs.h>
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#include <linux/fs.h>
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#include <linux/fscrypt.h>
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#include <linux/pagemap.h>
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#include <linux/pagemap.h>
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#include <linux/iomap.h>
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#include <linux/iomap.h>
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#include <linux/backing-dev.h>
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#include <linux/backing-dev.h>
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@ -179,11 +180,14 @@ static void iomap_dio_bio_end_io(struct bio *bio)
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static void iomap_dio_zero(const struct iomap_iter *iter, struct iomap_dio *dio,
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static void iomap_dio_zero(const struct iomap_iter *iter, struct iomap_dio *dio,
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loff_t pos, unsigned len)
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loff_t pos, unsigned len)
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{
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{
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struct inode *inode = file_inode(dio->iocb->ki_filp);
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struct page *page = ZERO_PAGE(0);
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struct page *page = ZERO_PAGE(0);
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int flags = REQ_SYNC | REQ_IDLE;
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int flags = REQ_SYNC | REQ_IDLE;
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struct bio *bio;
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struct bio *bio;
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bio = bio_alloc(GFP_KERNEL, 1);
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bio = bio_alloc(GFP_KERNEL, 1);
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fscrypt_set_bio_crypt_ctx(bio, inode, pos >> inode->i_blkbits,
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GFP_KERNEL);
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bio_set_dev(bio, iter->iomap.bdev);
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bio_set_dev(bio, iter->iomap.bdev);
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bio->bi_iter.bi_sector = iomap_sector(&iter->iomap, pos);
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bio->bi_iter.bi_sector = iomap_sector(&iter->iomap, pos);
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bio->bi_private = dio;
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bio->bi_private = dio;
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@ -310,6 +314,8 @@ static loff_t iomap_dio_bio_iter(const struct iomap_iter *iter,
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}
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}
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bio = bio_alloc(GFP_KERNEL, nr_pages);
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bio = bio_alloc(GFP_KERNEL, nr_pages);
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fscrypt_set_bio_crypt_ctx(bio, inode, pos >> inode->i_blkbits,
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GFP_KERNEL);
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bio_set_dev(bio, iomap->bdev);
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bio_set_dev(bio, iomap->bdev);
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bio->bi_iter.bi_sector = iomap_sector(iomap, pos);
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bio->bi_iter.bi_sector = iomap_sector(iomap, pos);
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bio->bi_write_hint = dio->iocb->ki_hint;
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bio->bi_write_hint = dio->iocb->ki_hint;
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