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zstream recompress: fix zero recompressed buffer and output

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If compression happend, any garbage past the compress size was not
zeroed out.

If compression didn't happen, then the payload size was still set to
the rounded-up return from zio_compress_data(), which is dependent on
the input, which is not necessarily the logical size.

So that's all fixed too, mostly from stealing the math from zio.c.

Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.
Signed-off-by: Rob Norris <rob.norris@klarasystems.com>
This commit is contained in:
Rob Norris 2024-07-23 11:43:18 +10:00 committed by Tony Hutter
parent a537d90734
commit cb36f4f352
1 changed files with 12 additions and 10 deletions
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22
cmd/zstream/zstream_recompress.c
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@ -287,24 +287,26 @@ zstream_do_recompress(int argc, char *argv[])
dbuf, drrw->drr_logical_size);
abd_t *pabd =
abd_get_from_buf_struct(&abd, buf, bufsz);
payload_size = P2ROUNDUP(zio_compress_data(
ctype, &dabd, &pabd,
drrw->drr_logical_size, level),
SPA_MINBLOCKSIZE);
if (payload_size != drrw->drr_logical_size) {
drrw->drr_compressiontype = ctype;
drrw->drr_compressed_size =
payload_size;
} else {
size_t csize = zio_compress_data(ctype, &dabd,
&pabd, drrw->drr_logical_size, level);
size_t rounded =
P2ROUNDUP(csize, SPA_MINBLOCKSIZE);
if (rounded >= drrw->drr_logical_size) {
memcpy(buf, dbuf, payload_size);
drrw->drr_compressiontype = 0;
drrw->drr_compressed_size = 0;
} else {
abd_zero_off(pabd, csize,
rounded - csize);
drrw->drr_compressiontype = ctype;
drrw->drr_compressed_size =
payload_size = rounded;
}
abd_free(&abd);
abd_free(&dabd);
free(dbuf);
} else {
drrw->drr_compressiontype = ctype;
drrw->drr_compressiontype = 0;
drrw->drr_compressed_size = 0;
}
break;