ext4: add fs-verity read support

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Make ext4_mpage_readpages() verify data as it is read from fs-verity
files, using the helper functions from fs/verity/.

To support both encryption and verity simultaneously, this required
refactoring the decryption workflow into a generic "post-read
processing" workflow which can do decryption, verification, or both.

The case where the ext4 block size is not equal to the PAGE_SIZE is not
supported yet, since in that case ext4_mpage_readpages() sometimes falls
back to block_read_full_page(), which does not support fs-verity yet.

Co-developed-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Eric Biggers <ebiggers@google.com>

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This commit is contained in:

Eric Biggers 2019-07-22 09:26:24 -07:00

parent c93d8f8858

commit 22cfe4b48c

4 changed files with 188 additions and 36 deletions

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2

fs/ext4/ext4.h

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2

fs/ext4/inode.c

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211

fs/ext4/readpage.c

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9

fs/ext4/super.c

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