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Code Issues Releases Wiki Activity

bcachefs: fix bch2_write_extent() crc corruption.

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crc.compression_type & nouce gets reset to inside bch2_rechecksum_bio(),
we set it back to the previous values calculated. This fixes
incompressible extents being marked as uncompressed.

Signed-off-by: Daniel Hill <daniel@gluo.nz>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Daniel Hill 2022-10-11 21:33:56 +13:00 committed by Kent Overstreet
parent 55b8550d30
commit 2d485df3da
1 changed files with 10 additions and 2 deletions
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12
fs/bcachefs/io.c
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@ -1074,8 +1074,7 @@ static int bch2_write_extent(struct bch_write_op *op, struct write_point *wp,
saved_iter = dst->bi_iter;
do {
struct bch_extent_crc_unpacked crc =
(struct bch_extent_crc_unpacked) { 0 };
struct bch_extent_crc_unpacked crc = { 0 };
struct bversion version = op->version;
size_t dst_len, src_len;
@ -1127,6 +1126,8 @@ static int bch2_write_extent(struct bch_write_op *op, struct write_point *wp,
!crc_is_compressed(crc) &&
bch2_csum_type_is_encryption(op->crc.csum_type) ==
bch2_csum_type_is_encryption(op->csum_type)) {
u8 compression_type = crc.compression_type;
u16 nonce = crc.nonce;
/*
* Note: when we're using rechecksum(), we need to be
* checksumming @src because it has all the data our
@ -1145,6 +1146,13 @@ static int bch2_write_extent(struct bch_write_op *op, struct write_point *wp,
bio_sectors(src) - (src_len >> 9),
op->csum_type))
goto csum_err;
/*
* rchecksum_bio sets compression_type on crc from op->crc,
* this isn't always correct as sometimes we're changing
* an extent from uncompressed to incompressible.
*/
crc.compression_type = compression_type;
crc.nonce = nonce;
} else {
if ((op->flags & BCH_WRITE_DATA_ENCODED) &&
bch2_rechecksum_bio(c, src, version, op->crc,