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| author | Eric Biggers <ebiggers@google.com> | 2023-01-27 14:25:14 -0800 |
|---|---|---|
| committer | Eric Biggers <ebiggers@google.com> | 2023-01-28 15:10:12 -0800 |
| commit | 51e4e3153ebc32d3280d5d17418ae6f1a44f1ec1 (patch) | |
| tree | 55d0a9d3b02a0a403034e6130829e0901e6f93fa /Documentation/filesystems | |
| parent | 5d0f0e57ed900917836385527ce5b122fa1425a3 (diff) | |
| download | linux-51e4e3153ebc32d3280d5d17418ae6f1a44f1ec1.tar.gz | |
fscrypt: support decrypting data from large folios
Try to make the filesystem-level decryption functions in fs/crypto/
aware of large folios. This includes making fscrypt_decrypt_bio()
support the case where the bio contains large folios, and making
fscrypt_decrypt_pagecache_blocks() take a folio instead of a page.
There's no way to actually test this with large folios yet, but I've
tested that this doesn't cause any regressions.
Note that this patch just handles *decryption*, not encryption which
will be a little more difficult.
Signed-off-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Link: https://lore.kernel.org/r/20230127224202.355629-1-ebiggers@kernel.org
Diffstat (limited to 'Documentation/filesystems')
| -rw-r--r-- | Documentation/filesystems/fscrypt.rst | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/Documentation/filesystems/fscrypt.rst b/Documentation/filesystems/fscrypt.rst index ef183387da208a..eccd327e6df504 100644 --- a/Documentation/filesystems/fscrypt.rst +++ b/Documentation/filesystems/fscrypt.rst @@ -1277,8 +1277,8 @@ the file contents themselves, as described below: For the read path (->read_folio()) of regular files, filesystems can read the ciphertext into the page cache and decrypt it in-place. The -page lock must be held until decryption has finished, to prevent the -page from becoming visible to userspace prematurely. +folio lock must be held until decryption has finished, to prevent the +folio from becoming visible to userspace prematurely. For the write path (->writepage()) of regular files, filesystems cannot encrypt data in-place in the page cache, since the cached |