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nbd/server: Simplify zero and trim

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Now that the block layer supports 64-bit operations (see commit
2800637a and friends, new to v6.2), we no longer have to self-fragment
requests larger than 2G, reverting the workaround added in 890cbccb08
("nbd: Fix large trim/zero requests", v5.1.0).

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20211117170230.1128262-3-eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
This commit is contained in:
Eric Blake 2021-11-17 11:02:30 -06:00
parent 1644cccea5
commit e35574226a
1 changed files with 3 additions and 20 deletions
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23
nbd/server.c
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@ -2509,16 +2509,8 @@ static coroutine_fn int nbd_handle_request(NBDClient *client,
if (request->flags & NBD_CMD_FLAG_FAST_ZERO) {
flags |= BDRV_REQ_NO_FALLBACK;
}
ret = 0;
/* FIXME simplify this when blk_pwrite_zeroes switches to 64-bit */
while (ret >= 0 && request->len) {
int align = client->check_align ?: 1;
int len = MIN(request->len, QEMU_ALIGN_DOWN(BDRV_REQUEST_MAX_BYTES,
align));
ret = blk_pwrite_zeroes(exp->common.blk, request->from, len, flags);
request->len -= len;
request->from += len;
}
ret = blk_pwrite_zeroes(exp->common.blk, request->from, request->len,
flags);
return nbd_send_generic_reply(client, request->handle, ret,
"writing to file failed", errp);
@ -2532,16 +2524,7 @@ static coroutine_fn int nbd_handle_request(NBDClient *client,
"flush failed", errp);
case NBD_CMD_TRIM:
ret = 0;
/* FIXME simplify this when blk_co_pdiscard switches to 64-bit */
while (ret >= 0 && request->len) {
int align = client->check_align ?: 1;
int len = MIN(request->len, QEMU_ALIGN_DOWN(BDRV_REQUEST_MAX_BYTES,
align));
ret = blk_co_pdiscard(exp->common.blk, request->from, len);
request->len -= len;
request->from += len;
}
ret = blk_co_pdiscard(exp->common.blk, request->from, request->len);
if (ret >= 0 && request->flags & NBD_CMD_FLAG_FUA) {
ret = blk_co_flush(exp->common.blk);
}