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bcachefs: Fix bkey format calculation

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For extents, we increase the number of bits of the size field to allow
extents to get bigger due to merging - but this code didn't check for
overflow.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2023-08-13 19:34:02 -04:00
parent c8ef8c3eb5
commit 029b85fe41
1 changed files with 4 additions and 2 deletions
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6
fs/bcachefs/bkey.c
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@ -591,8 +591,10 @@ struct bkey_format bch2_bkey_format_done(struct bkey_format_state *s)
/* allow for extent merging: */
if (ret.bits_per_field[BKEY_FIELD_SIZE]) {
ret.bits_per_field[BKEY_FIELD_SIZE] += 4;
bits += 4;
unsigned b = min(4U, 32U - ret.bits_per_field[BKEY_FIELD_SIZE]);
ret.bits_per_field[BKEY_FIELD_SIZE] += b;
bits += b;
}
ret.key_u64s = DIV_ROUND_UP(bits, 64);