btrfs: simplify tree block checksumming loop

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Thw whole point of csum_tree_block is to iterate over all extent buffer
pages and pass it to checksumming functions. The bytes where checksum is
stored must be skipped, thus map_private_extent_buffer. This complicates
further offset calculations.

As the first page will be always present, checksum the relevant bytes
unconditionally and then do a simple iteration over the remaining pages.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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David Sterba 2020-02-27 21:00:47 +01:00

parent 59a0fcdb48

commit e9be5a303d

1 changed files with 8 additions and 24 deletions

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32

fs/btrfs/disk-io.c

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