From: Eric Biggers <ebiggers@xxxxxxxxxx> Adjust fscrypt_zeroout_range() to encrypt a block at a time rather than a page at a time, so that it works when blocksize < PAGE_SIZE. This isn't optimized for performance, but then again this function already wasn't optimized for performance. As a future optimization, we could submit much larger bios here. This is in preparation for allowing encryption on ext4 filesystems with blocksize != PAGE_SIZE. This is based on work by Chandan Rajendra. Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx> --- fs/crypto/bio.c | 15 ++++++--------- 1 file changed, 6 insertions(+), 9 deletions(-) diff --git a/fs/crypto/bio.c b/fs/crypto/bio.c index bcab8822217b0..e67e9d4d342b3 100644 --- a/fs/crypto/bio.c +++ b/fs/crypto/bio.c @@ -73,12 +73,12 @@ EXPORT_SYMBOL(fscrypt_enqueue_decrypt_bio); int fscrypt_zeroout_range(const struct inode *inode, pgoff_t lblk, sector_t pblk, unsigned int len) { + const unsigned int blockbits = inode->i_blkbits; + const unsigned int blocksize = 1 << blockbits; struct page *ciphertext_page; struct bio *bio; int ret, err = 0; - BUG_ON(inode->i_sb->s_blocksize != PAGE_SIZE); - ciphertext_page = fscrypt_alloc_bounce_page(GFP_NOWAIT); if (!ciphertext_page) return -ENOMEM; @@ -86,7 +86,7 @@ int fscrypt_zeroout_range(const struct inode *inode, pgoff_t lblk, while (len--) { err = fscrypt_crypt_block(inode, FS_ENCRYPT, lblk, ZERO_PAGE(0), ciphertext_page, - PAGE_SIZE, 0, GFP_NOFS); + blocksize, 0, GFP_NOFS); if (err) goto errout; @@ -96,14 +96,11 @@ int fscrypt_zeroout_range(const struct inode *inode, pgoff_t lblk, goto errout; } bio_set_dev(bio, inode->i_sb->s_bdev); - bio->bi_iter.bi_sector = - pblk << (inode->i_sb->s_blocksize_bits - 9); + bio->bi_iter.bi_sector = pblk << (blockbits - 9); bio_set_op_attrs(bio, REQ_OP_WRITE, 0); - ret = bio_add_page(bio, ciphertext_page, - inode->i_sb->s_blocksize, 0); - if (ret != inode->i_sb->s_blocksize) { + ret = bio_add_page(bio, ciphertext_page, blocksize, 0); + if (WARN_ON(ret != blocksize)) { /* should never happen! */ - WARN_ON(1); bio_put(bio); err = -EIO; goto errout; -- 2.21.0.593.g511ec345e18-goog
![]() |