Once extended mode is enabled, we need to accept 64-bit status replies
(even for replies that don't exceed a 32-bit length). It is easier to
normalize narrow replies into wide format so that the rest of our code
only has to handle one width. Although a server is non-compliant if
it sends a 64-bit reply in compact mode, or a 32-bit reply in extended
mode, it is still easy enough to tolerate these mismatches.
In normal execution, we are only requesting "base:allocation" which
never exceeds 32 bits for flag values. But during testing with
x-dirty-bitmap, we can force qemu to connect to some other context
that might have 64-bit status bit; however, we ignore those upper bits
(other than mapping qemu:allocation-depth into something that
'qemu-img map --output=json' can expose), and since that only affects
testing, we really don't bother with checking whether more than the
two least-significant bits are set.
Signed-off-by: Eric Blake <ebl...@redhat.com>
---
v4: tweak comments and error message about count mismatch, fix setting
of wide in loop [Vladimir]
---
block/nbd.c | 47 ++++++++++++++++++++++++++++++++--------------
block/trace-events | 1 +
2 files changed, 34 insertions(+), 14 deletions(-)
diff --git a/block/nbd.c b/block/nbd.c
index e281fac43d1..74c0a9d3b8c 100644
--- a/block/nbd.c
+++ b/block/nbd.c
@@ -614,13 +614,16 @@ static int nbd_parse_offset_hole_payload(BDRVNBDState *s,
*/
static int nbd_parse_blockstatus_payload(BDRVNBDState *s,
NBDStructuredReplyChunk *chunk,
- uint8_t *payload, uint64_t
orig_length,
- NBDExtent32 *extent, Error **errp)
+ uint8_t *payload, bool wide,
+ uint64_t orig_length,
+ NBDExtent64 *extent, Error **errp)
{
uint32_t context_id;
+ uint32_t count;
+ size_t len = wide ? sizeof(*extent) : sizeof(NBDExtent32);
/* The server succeeded, so it must have sent [at least] one extent */
- if (chunk->length < sizeof(context_id) + sizeof(*extent)) {
+ if (chunk->length < sizeof(context_id) + wide * sizeof(count) + len) {
error_setg(errp, "Protocol error: invalid payload for "
"NBD_REPLY_TYPE_BLOCK_STATUS");
return -EINVAL;
@@ -635,8 +638,15 @@ static int nbd_parse_blockstatus_payload(BDRVNBDState *s,
return -EINVAL;
}
- extent->length = payload_advance32(&payload);
- extent->flags = payload_advance32(&payload);
+ if (wide) {
+ count = payload_advance32(&payload);
+ extent->length = payload_advance64(&payload);
+ extent->flags = payload_advance64(&payload);
+ } else {
+ count = 0;
+ extent->length = payload_advance32(&payload);
+ extent->flags = payload_advance32(&payload);
+ }
if (extent->length == 0) {
error_setg(errp, "Protocol error: server sent status chunk with "
@@ -671,13 +681,16 @@ static int nbd_parse_blockstatus_payload(BDRVNBDState *s,
/*
* We used NBD_CMD_FLAG_REQ_ONE, so the server should not have
* sent us any more than one extent, nor should it have included
- * status beyond our request in that extent. However, it's easy
- * enough to ignore the server's noncompliance without killing the
+ * status beyond our request in that extent. Furthermore, a wide
+ * server should have replied with an accurate count (we left
+ * count at 0 for a narrow server). However, it's easy enough to
+ * ignore the server's noncompliance without killing the
* connection; just ignore trailing extents, and clamp things to
* the length of our request.
*/
- if (chunk->length > sizeof(context_id) + sizeof(*extent)) {
- trace_nbd_parse_blockstatus_compliance("more than one extent");
+ if (count != wide ||
+ chunk->length > sizeof(context_id) + wide * sizeof(count) + len) {
+ trace_nbd_parse_blockstatus_compliance("unexpected extent count");
}
if (extent->length > orig_length) {
extent->length = orig_length;
@@ -1123,7 +1136,7 @@ nbd_co_receive_cmdread_reply(BDRVNBDState *s, uint64_t
cookie,
static int coroutine_fn
nbd_co_receive_blockstatus_reply(BDRVNBDState *s, uint64_t cookie,
- uint64_t length, NBDExtent32 *extent,
+ uint64_t length, NBDExtent64 *extent,
int *request_ret, Error **errp)
{
NBDReplyChunkIter iter;
@@ -1136,11 +1149,17 @@ nbd_co_receive_blockstatus_reply(BDRVNBDState *s,
uint64_t cookie,
NBD_FOREACH_REPLY_CHUNK(s, iter, cookie, false, NULL, &reply, &payload) {
int ret;
NBDStructuredReplyChunk *chunk = &reply.structured;
+ bool wide;
assert(nbd_reply_is_structured(&reply));
switch (chunk->type) {
+ case NBD_REPLY_TYPE_BLOCK_STATUS_EXT:
case NBD_REPLY_TYPE_BLOCK_STATUS:
+ wide = chunk->type == NBD_REPLY_TYPE_BLOCK_STATUS_EXT;
+ if ((s->info.mode >= NBD_MODE_EXTENDED) != wide) {
+ trace_nbd_extended_headers_compliance("block_status");
+ }
if (received) {
nbd_channel_error(s, -EINVAL);
error_setg(&local_err, "Several BLOCK_STATUS chunks in reply");
@@ -1148,9 +1167,9 @@ nbd_co_receive_blockstatus_reply(BDRVNBDState *s,
uint64_t cookie,
}
received = true;
- ret = nbd_parse_blockstatus_payload(s, &reply.structured,
- payload, length, extent,
- &local_err);
+ ret = nbd_parse_blockstatus_payload(
+ s, &reply.structured, payload, wide,
+ length, extent, &local_err);
if (ret < 0) {
nbd_channel_error(s, ret);
nbd_iter_channel_error(&iter, ret, &local_err);
@@ -1380,7 +1399,7 @@ static int coroutine_fn GRAPH_RDLOCK
nbd_client_co_block_status(
int64_t *pnum, int64_t *map, BlockDriverState **file)
{
int ret, request_ret;
- NBDExtent32 extent = { 0 };
+ NBDExtent64 extent = { 0 };
BDRVNBDState *s = (BDRVNBDState *)bs->opaque;
Error *local_err = NULL;
diff --git a/block/trace-events b/block/trace-events
index 6f121b76365..a0fc79153d3 100644
--- a/block/trace-events
+++ b/block/trace-events
@@ -166,6 +166,7 @@ iscsi_xcopy(void *src_lun, uint64_t src_off, void *dst_lun,
uint64_t dst_off, ui
# nbd.c
nbd_parse_blockstatus_compliance(const char *err) "ignoring extra data from
non-compliant server: %s"
nbd_structured_read_compliance(const char *type) "server sent non-compliant
unaligned read %s chunk"
+nbd_extended_headers_compliance(const char *type) "server sent non-compliant
%s chunk not matching choice of extended headers"
nbd_read_reply_entry_fail(int ret, const char *err) "ret = %d, err: %s"
nbd_co_request_fail(uint64_t from, uint32_t len, uint64_t handle, uint16_t
flags, uint16_t type, const char *name, int ret, const char *err) "Request
failed { .from = %" PRIu64", .len = %" PRIu32 ", .handle = %" PRIu64 ", .flags
= 0x%" PRIx16 ", .type = %" PRIu16 " (%s) } ret = %d, err: %s"
nbd_client_handshake(const char *export_name) "export '%s'"
--
2.40.1
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