fsverity: simplify Merkle tree readahead size calculation

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First, calculate max_ra_pages more efficiently by using the bio size.

Second, calculate the number of readahead pages from the hash page
index, instead of calculating it ahead of time using the data page
index.  This ends up being a bit simpler, especially since level 0 is
last in the tree, so we can just limit the readahead to the tree size.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Andrey Albershteyn <aalbersh@redhat.com>
Tested-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Link: https://lore.kernel.org/r/20221223203638.41293-3-ebiggers@kernel.org

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This commit is contained in:

Eric Biggers 2022-12-23 12:36:29 -08:00

parent 284d5db5f9

commit 9098f36b73

3 changed files with 10 additions and 16 deletions

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2

fs/verity/fsverity_private.h

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3

fs/verity/open.c

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21

fs/verity/verify.c

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