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fscrypt: Enable partial page encryption

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Not all filesystems work on full pages, thus we should allow them to
hand partial pages to fscrypt for en/decryption.

Signed-off-by: David Gstir <david@sigma-star.at>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
David Gstir
2016-11-13 22:20:46 +01:00
committed by Theodore Ts'o
parent b50f7b268b
commit 7821d4dd45
5 changed files with 44 additions and 24 deletions
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6
fs/ext4/inode.c
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@@ -1166,7 +1166,8 @@ static int ext4_block_write_begin(struct page *page, loff_t pos, unsigned len,
if (unlikely(err))
page_zero_new_buffers(page, from, to);
else if (decrypt)
err = fscrypt_decrypt_page(page->mapping->host, page);
err = fscrypt_decrypt_page(page->mapping->host, page,
PAGE_SIZE, 0);
return err;
}
#endif
@@ -3743,8 +3744,9 @@ static int __ext4_block_zero_page_range(handle_t *handle,
/* We expect the key to be set. */
BUG_ON(!fscrypt_has_encryption_key(inode));
BUG_ON(blocksize != PAGE_SIZE);
BUG_ON(!PageLocked(page));
WARN_ON_ONCE(fscrypt_decrypt_page(page->mapping->host,
page));
page, PAGE_SIZE, 0));
}
}
if (ext4_should_journal_data(inode)) {