github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-06-03 03:53:37 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

dm-verity-fec: simplify deinterleaving

Browse Source 
Since fec_read_bufs() deinterleaves the bytes from 'bbuf' sequentially
starting from 'block_offset', it can just do simple increments instead
of the more complex fec_buffer_rs_index() computation.

Signed-off-by: Eric Biggers <ebiggers@kernel.org>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
This commit is contained in:
Eric Biggers 2026-02-05 20:59:34 -08:00 committed by Mikulas Patocka
parent 5ef22361fa
commit 96dfabe738
1 changed files with 4 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/md/dm-verity-fec.c
View File

@ -44,15 +44,6 @@ static inline u8 *fec_buffer_rs_message(struct dm_verity *v,
return &fio->bufs[i][j * v->fec->rs_k];
}
/*
* Return the index of the current RS message when called inside
* fec_for_each_buffer_rs_message.
*/
static inline unsigned int fec_buffer_rs_index(unsigned int i, unsigned int j)
{
return (i << DM_VERITY_FEC_BUF_RS_BITS) + j;
}
/*
* Decode all RS codewords whose message bytes were loaded into fio->bufs. Copy
* the corrected bytes into fio->output starting from block_offset.
@ -179,7 +170,7 @@ static int fec_read_bufs(struct dm_verity *v, struct dm_verity_io *io,
u64 block, ileaved;
u8 *bbuf;
u8 want_digest[HASH_MAX_DIGESTSIZE];
unsigned int n, k;
unsigned int n, src_pos;
struct bio *bio = dm_bio_from_per_bio_data(io, v->ti->per_io_data_size);
if (neras)
@ -254,13 +245,11 @@ static int fec_read_bufs(struct dm_verity *v, struct dm_verity_io *io,
* deinterleave and copy the bytes that fit into bufs,
* starting from block_offset
*/
src_pos = block_offset;
fec_for_each_buffer_rs_message(fio, n, j) {
k = fec_buffer_rs_index(n, j) + block_offset;
if (k >= v->fec->block_size)
if (src_pos >= v->fec->block_size)
goto done;
fec_buffer_rs_message(v, fio, n, j)[i] = bbuf[k];
fec_buffer_rs_message(v, fio, n, j)[i] = bbuf[src_pos++];
}
done:
dm_bufio_release(buf);