diff options
Diffstat (limited to 'drivers/md/bcache/bkey.c')
| -rw-r--r-- | drivers/md/bcache/bkey.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/md/bcache/bkey.c b/drivers/md/bcache/bkey.c index ab3a034f407a..b60a2481f92e 100644 --- a/drivers/md/bcache/bkey.c +++ b/drivers/md/bcache/bkey.c @@ -296,6 +296,26 @@ struct bkey_format bch_bkey_format_done(struct bkey_format_state *s) return ret; } +const char *bch_bkey_format_validate(struct bkey_format *f) +{ + unsigned i, bits = KEY_PACKED_BITS_START; + + if (f->nr_fields != BKEY_NR_FIELDS) + return "invalid format: incorrect number of fields"; + + for (i = 0; i < f->nr_fields; i++) { + if (f->bits_per_field[i] > 64) + return "invalid format: field too large"; + + bits += f->bits_per_field[i]; + } + + if (f->key_u64s != DIV_ROUND_UP(bits, 64)) + return "invalid format: incorrect key_u64s"; + + return NULL; +} + /* Most significant differing bit */ unsigned bkey_greatest_differing_bit(const struct bkey_format *format, const struct bkey_packed *l_k, |