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bh=VQEuNU2/jJusSrTsFEzfelNd8oC3XZ5NHcpk8g3ZDmA=; b=EH768xsyE0g3cW3w0yjsaaK6wV/szsGe5/cXCtWakbdB0R9hyYOctUOBVMeS0pL7DAVZA2 wlvwMd3ME6QCATx8sh7mqPW+IfvpyXmrnPPRWN4d7gy6pWE7XIXuhBnoYk3dOEYDoJ1So0 1rrP959qNGQkj5TE7Xg2pcVgkY95z3E= X-MC-Unique: Wp95qIOVP9G4-pMteQb73A-1 From: Eric Blake To: qemu-devel@nongnu.org Cc: qemu-block@nongnu.org, vsementsov@yandex-team.ru, Kevin Wolf , Hanna Reitz Subject: [PATCH v6 04/17] nbd: Prepare for 64-bit request effect lengths Date: Tue, 29 Aug 2023 12:58:31 -0500 Message-ID: <20230829175826.377251-23-eblake@redhat.com> In-Reply-To: <20230829175826.377251-19-eblake@redhat.com> References: <20230829175826.377251-19-eblake@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.4 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=eblake@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1693332612801100003 Content-Type: text/plain; charset="utf-8" Widen the length field of NBDRequest to 64-bits, although we can assert that all current uses are still under 32 bits: either because of NBD_MAX_BUFFER_SIZE which is even smaller (and where size_t can still be appropriate, even on 32-bit platforms), or because nothing ever puts us into NBD_MODE_EXTENDED yet (and while future patches will allow larger transactions, the lengths in play here are still capped at 32-bit). There are no semantic changes, other than a typo fix in a couple of error messages. Signed-off-by: Eric Blake Reviewed-by: Vladimir Sementsov-Ogievskiy --- v6: fix sign extension bug v5: tweak commit message, adjust a few more spots [Vladimir] v4: split off enum changes to earlier patches [Vladimir] --- include/block/nbd.h | 4 ++-- block/nbd.c | 25 +++++++++++++++++++------ nbd/client.c | 1 + nbd/server.c | 23 +++++++++++++++-------- block/trace-events | 2 +- nbd/trace-events | 14 +++++++------- 6 files changed, 45 insertions(+), 24 deletions(-) diff --git a/include/block/nbd.h b/include/block/nbd.h index b2fb8ab44d5..ec4e8eda6bd 100644 --- a/include/block/nbd.h +++ b/include/block/nbd.h @@ -71,8 +71,8 @@ typedef enum NBDMode { */ typedef struct NBDRequest { uint64_t cookie; - uint64_t from; - uint32_t len; + uint64_t from; /* Offset touched by the command */ + uint64_t len; /* Effect length; 32 bit limit without extended header= s */ uint16_t flags; /* NBD_CMD_FLAG_* */ uint16_t type; /* NBD_CMD_* */ NBDMode mode; /* Determines which network representation to use */ diff --git a/block/nbd.c b/block/nbd.c index c7581794873..57123c17f94 100644 --- a/block/nbd.c +++ b/block/nbd.c @@ -1306,10 +1306,11 @@ nbd_client_co_pwrite_zeroes(BlockDriverState *bs, i= nt64_t offset, int64_t bytes, NBDRequest request =3D { .type =3D NBD_CMD_WRITE_ZEROES, .from =3D offset, - .len =3D bytes, /* .len is uint32_t actually */ + .len =3D bytes, }; - assert(bytes <=3D UINT32_MAX); /* rely on max_pwrite_zeroes */ + /* rely on max_pwrite_zeroes */ + assert(bytes <=3D UINT32_MAX || s->info.mode >=3D NBD_MODE_EXTENDED); assert(!(s->info.flags & NBD_FLAG_READ_ONLY)); if (!(s->info.flags & NBD_FLAG_SEND_WRITE_ZEROES)) { @@ -1356,10 +1357,11 @@ nbd_client_co_pdiscard(BlockDriverState *bs, int64_= t offset, int64_t bytes) NBDRequest request =3D { .type =3D NBD_CMD_TRIM, .from =3D offset, - .len =3D bytes, /* len is uint32_t */ + .len =3D bytes, }; - assert(bytes <=3D UINT32_MAX); /* rely on max_pdiscard */ + /* rely on max_pdiscard */ + assert(bytes <=3D UINT32_MAX || s->info.mode >=3D NBD_MODE_EXTENDED); assert(!(s->info.flags & NBD_FLAG_READ_ONLY)); if (!(s->info.flags & NBD_FLAG_SEND_TRIM) || !bytes) { @@ -1381,8 +1383,7 @@ static int coroutine_fn GRAPH_RDLOCK nbd_client_co_bl= ock_status( NBDRequest request =3D { .type =3D NBD_CMD_BLOCK_STATUS, .from =3D offset, - .len =3D MIN(QEMU_ALIGN_DOWN(INT_MAX, bs->bl.request_alignment), - MIN(bytes, s->info.size - offset)), + .len =3D MIN(bytes, s->info.size - offset), .flags =3D NBD_CMD_FLAG_REQ_ONE, }; @@ -1392,6 +1393,10 @@ static int coroutine_fn GRAPH_RDLOCK nbd_client_co_b= lock_status( *file =3D bs; return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; } + if (s->info.mode < NBD_MODE_EXTENDED) { + request.len =3D MIN(QEMU_ALIGN_DOWN(INT_MAX, bs->bl.request_alignm= ent), + request.len); + } /* * Work around the fact that the block layer doesn't do @@ -1956,6 +1961,14 @@ static void nbd_refresh_limits(BlockDriverState *bs,= Error **errp) bs->bl.max_pwrite_zeroes =3D max; bs->bl.max_transfer =3D max; + /* + * Assume that if the server supports extended headers, it also + * supports unlimited size zero and trim commands. + */ + if (s->info.mode >=3D NBD_MODE_EXTENDED) { + bs->bl.max_pdiscard =3D bs->bl.max_pwrite_zeroes =3D 0; + } + if (s->info.opt_block && s->info.opt_block > bs->bl.opt_transfer) { bs->bl.opt_transfer =3D s->info.opt_block; diff --git a/nbd/client.c b/nbd/client.c index 40a1eb72346..1495a9b0ab1 100644 --- a/nbd/client.c +++ b/nbd/client.c @@ -1355,6 +1355,7 @@ int nbd_send_request(QIOChannel *ioc, NBDRequest *req= uest) uint8_t buf[NBD_REQUEST_SIZE]; assert(request->mode <=3D NBD_MODE_STRUCTURED); /* TODO handle extende= d */ + assert(request->len <=3D UINT32_MAX); trace_nbd_send_request(request->from, request->len, request->cookie, request->flags, request->type, nbd_cmd_lookup(request->type)); diff --git a/nbd/server.c b/nbd/server.c index 97403db2e07..e38a8f700a9 100644 --- a/nbd/server.c +++ b/nbd/server.c @@ -1165,7 +1165,7 @@ static int nbd_negotiate_options(NBDClient *client, E= rror **errp) client->optlen =3D length; if (length > NBD_MAX_BUFFER_SIZE) { - error_setg(errp, "len (%" PRIu32" ) is larger than max len (%u= )", + error_setg(errp, "len (%" PRIu32 ") is larger than max len (%u= )", length, NBD_MAX_BUFFER_SIZE); return -EINVAL; } @@ -1441,7 +1441,7 @@ static int coroutine_fn nbd_receive_request(NBDClient= *client, NBDRequest *reque request->type =3D lduw_be_p(buf + 6); request->cookie =3D ldq_be_p(buf + 8); request->from =3D ldq_be_p(buf + 16); - request->len =3D ldl_be_p(buf + 24); + request->len =3D (uint32_t)ldl_be_p(buf + 24); /* widen 32 to 64 bi= ts */ trace_nbd_receive_request(magic, request->flags, request->type, request->from, request->len); @@ -1899,7 +1899,7 @@ static int coroutine_fn nbd_co_send_simple_reply(NBDC= lient *client, NBDRequest *request, uint32_t error, void *data, - size_t len, + uint64_t len, Error **errp) { NBDSimpleReply reply; @@ -1910,6 +1910,7 @@ static int coroutine_fn nbd_co_send_simple_reply(NBDC= lient *client, }; assert(!len || !nbd_err); + assert(len <=3D NBD_MAX_STRING_SIZE); assert(client->mode < NBD_MODE_STRUCTURED || (client->mode =3D=3D NBD_MODE_STRUCTURED && request->type !=3D NBD_CMD_READ)); @@ -1968,7 +1969,7 @@ static int coroutine_fn nbd_co_send_chunk_read(NBDCli= ent *client, NBDRequest *request, uint64_t offset, void *data, - size_t size, + uint64_t size, bool final, Error **errp) { @@ -1980,7 +1981,7 @@ static int coroutine_fn nbd_co_send_chunk_read(NBDCli= ent *client, {.iov_base =3D data, .iov_len =3D size} }; - assert(size); + assert(size && size <=3D NBD_MAX_BUFFER_SIZE); trace_nbd_co_send_chunk_read(request->cookie, offset, data, size); set_be_chunk(client, iov, 3, final ? NBD_REPLY_FLAG_DONE : 0, NBD_REPLY_TYPE_OFFSET_DATA, request); @@ -2023,13 +2024,14 @@ static int coroutine_fn nbd_co_send_sparse_read(NBD= Client *client, NBDRequest *request, uint64_t offset, uint8_t *data, - size_t size, + uint64_t size, Error **errp) { int ret =3D 0; NBDExport *exp =3D client->exp; size_t progress =3D 0; + assert(size <=3D NBD_MAX_BUFFER_SIZE); while (progress < size) { int64_t pnum; int status =3D blk_co_block_status_above(exp->common.blk, NULL, @@ -2359,7 +2361,7 @@ static int coroutine_fn nbd_co_receive_request(NBDReq= uestData *req, NBDRequest * request->type =3D=3D NBD_CMD_CACHE) { if (request->len > NBD_MAX_BUFFER_SIZE) { - error_setg(errp, "len (%" PRIu32" ) is larger than max len (%u= )", + error_setg(errp, "len (%" PRIu64 ") is larger than max len (%u= )", request->len, NBD_MAX_BUFFER_SIZE); return -EINVAL; } @@ -2375,6 +2377,7 @@ static int coroutine_fn nbd_co_receive_request(NBDReq= uestData *req, NBDRequest * } if (request->type =3D=3D NBD_CMD_WRITE) { + assert(request->len <=3D NBD_MAX_BUFFER_SIZE); if (nbd_read(client->ioc, req->data, request->len, "CMD_WRITE data= ", errp) < 0) { @@ -2396,7 +2399,7 @@ static int coroutine_fn nbd_co_receive_request(NBDReq= uestData *req, NBDRequest * } if (request->from > client->exp->size || request->len > client->exp->size - request->from) { - error_setg(errp, "operation past EOF; From: %" PRIu64 ", Len: %" P= RIu32 + error_setg(errp, "operation past EOF; From: %" PRIu64 ", Len: %" P= RIu64 ", Size: %" PRIu64, request->from, request->len, client->exp->size); return (request->type =3D=3D NBD_CMD_WRITE || @@ -2458,6 +2461,7 @@ static coroutine_fn int nbd_do_cmd_read(NBDClient *cl= ient, NBDRequest *request, NBDExport *exp =3D client->exp; assert(request->type =3D=3D NBD_CMD_READ); + assert(request->len <=3D NBD_MAX_BUFFER_SIZE); /* XXX: NBD Protocol only documents use of FUA with WRITE */ if (request->flags & NBD_CMD_FLAG_FUA) { @@ -2508,6 +2512,7 @@ static coroutine_fn int nbd_do_cmd_cache(NBDClient *c= lient, NBDRequest *request, NBDExport *exp =3D client->exp; assert(request->type =3D=3D NBD_CMD_CACHE); + assert(request->len <=3D NBD_MAX_BUFFER_SIZE); ret =3D blk_co_preadv(exp->common.blk, request->from, request->len, NULL, BDRV_REQ_COPY_ON_READ | BDRV_REQ_PREFETCH); @@ -2541,6 +2546,7 @@ static coroutine_fn int nbd_handle_request(NBDClient = *client, if (request->flags & NBD_CMD_FLAG_FUA) { flags |=3D BDRV_REQ_FUA; } + assert(request->len <=3D NBD_MAX_BUFFER_SIZE); ret =3D blk_co_pwrite(exp->common.blk, request->from, request->len= , data, flags); return nbd_send_generic_reply(client, request, ret, @@ -2584,6 +2590,7 @@ static coroutine_fn int nbd_handle_request(NBDClient = *client, return nbd_send_generic_reply(client, request, -EINVAL, "need non-zero length", errp); } + assert(request->len <=3D UINT32_MAX); if (client->export_meta.count) { bool dont_fragment =3D request->flags & NBD_CMD_FLAG_REQ_ONE; int contexts_remaining =3D client->export_meta.count; diff --git a/block/trace-events b/block/trace-events index 6f121b76365..925aa554bbf 100644 --- a/block/trace-events +++ b/block/trace-events @@ -167,7 +167,7 @@ iscsi_xcopy(void *src_lun, uint64_t src_off, void *dst_= lun, uint64_t dst_off, ui nbd_parse_blockstatus_compliance(const char *err) "ignoring extra data fro= m non-compliant server: %s" nbd_structured_read_compliance(const char *type) "server sent non-complian= t unaligned read %s chunk" nbd_read_reply_entry_fail(int ret, const char *err) "ret =3D %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 =3D %" PRIu64", .len =3D %" PRIu32 ", .handle =3D %" PRIu64= ", .flags =3D 0x%" PRIx16 ", .type =3D %" PRIu16 " (%s) } ret =3D %d, err:= %s" +nbd_co_request_fail(uint64_t from, uint64_t len, uint64_t handle, uint16_t= flags, uint16_t type, const char *name, int ret, const char *err) "Request= failed { .from =3D %" PRIu64", .len =3D %" PRIu64 ", .handle =3D %" PRIu64= ", .flags =3D 0x%" PRIx16 ", .type =3D %" PRIu16 " (%s) } ret =3D %d, err:= %s" nbd_client_handshake(const char *export_name) "export '%s'" nbd_client_handshake_success(const char *export_name) "export '%s'" nbd_reconnect_attempt(unsigned in_flight) "in_flight %u" diff --git a/nbd/trace-events b/nbd/trace-events index f19a4d0db39..f9dccfcfb44 100644 --- a/nbd/trace-events +++ b/nbd/trace-events @@ -31,7 +31,7 @@ nbd_client_loop(void) "Doing NBD loop" nbd_client_loop_ret(int ret, const char *error) "NBD loop returned %d: %s" nbd_client_clear_queue(void) "Clearing NBD queue" nbd_client_clear_socket(void) "Clearing NBD socket" -nbd_send_request(uint64_t from, uint32_t len, uint64_t cookie, uint16_t fl= ags, uint16_t type, const char *name) "Sending request to server: { .from = =3D %" PRIu64", .len =3D %" PRIu32 ", .cookie =3D %" PRIu64 ", .flags =3D 0= x%" PRIx16 ", .type =3D %" PRIu16 " (%s) }" +nbd_send_request(uint64_t from, uint64_t len, uint64_t cookie, uint16_t fl= ags, uint16_t type, const char *name) "Sending request to server: { .from = =3D %" PRIu64", .len =3D %" PRIu64 ", .cookie =3D %" PRIu64 ", .flags =3D 0= x%" PRIx16 ", .type =3D %" PRIu16 " (%s) }" nbd_receive_simple_reply(int32_t error, const char *errname, uint64_t cook= ie) "Got simple reply: { .error =3D %" PRId32 " (%s), cookie =3D %" PRIu64"= }" nbd_receive_structured_reply_chunk(uint16_t flags, uint16_t type, const ch= ar *name, uint64_t cookie, uint32_t length) "Got structured reply chunk: { = flags =3D 0x%" PRIx16 ", type =3D %d (%s), cookie =3D %" PRIu64 ", length = =3D %" PRIu32 " }" @@ -60,18 +60,18 @@ nbd_negotiate_options_check_option(uint32_t option, con= st char *name) "Checking nbd_negotiate_begin(void) "Beginning negotiation" nbd_negotiate_new_style_size_flags(uint64_t size, unsigned flags) "adverti= sing size %" PRIu64 " and flags 0x%x" nbd_negotiate_success(void) "Negotiation succeeded" -nbd_receive_request(uint32_t magic, uint16_t flags, uint16_t type, uint64_= t from, uint32_t len) "Got request: { magic =3D 0x%" PRIx32 ", .flags =3D 0= x%" PRIx16 ", .type =3D 0x%" PRIx16 ", from =3D %" PRIu64 ", len =3D %" PRI= u32 " }" +nbd_receive_request(uint32_t magic, uint16_t flags, uint16_t type, uint64_= t from, uint64_t len) "Got request: { magic =3D 0x%" PRIx32 ", .flags =3D 0= x%" PRIx16 ", .type =3D 0x%" PRIx16 ", from =3D %" PRIu64 ", len =3D %" PRI= u64 " }" nbd_blk_aio_attached(const char *name, void *ctx) "Export %s: Attaching cl= ients to AIO context %p" nbd_blk_aio_detach(const char *name, void *ctx) "Export %s: Detaching clie= nts from AIO context %p" -nbd_co_send_simple_reply(uint64_t cookie, uint32_t error, const char *errn= ame, int len) "Send simple reply: cookie =3D %" PRIu64 ", error =3D %" PRIu= 32 " (%s), len =3D %d" +nbd_co_send_simple_reply(uint64_t cookie, uint32_t error, const char *errn= ame, uint64_t len) "Send simple reply: cookie =3D %" PRIu64 ", error =3D %"= PRIu32 " (%s), len =3D %" PRIu64 nbd_co_send_chunk_done(uint64_t cookie) "Send structured reply done: cooki= e =3D %" PRIu64 -nbd_co_send_chunk_read(uint64_t cookie, uint64_t offset, void *data, size_= t size) "Send structured read data reply: cookie =3D %" PRIu64 ", offset = =3D %" PRIu64 ", data =3D %p, len =3D %zu" -nbd_co_send_chunk_read_hole(uint64_t cookie, uint64_t offset, size_t size)= "Send structured read hole reply: cookie =3D %" PRIu64 ", offset =3D %" PR= Iu64 ", len =3D %zu" +nbd_co_send_chunk_read(uint64_t cookie, uint64_t offset, void *data, uint6= 4_t size) "Send structured read data reply: cookie =3D %" PRIu64 ", offset = =3D %" PRIu64 ", data =3D %p, len =3D %" PRIu64 +nbd_co_send_chunk_read_hole(uint64_t cookie, uint64_t offset, uint64_t siz= e) "Send structured read hole reply: cookie =3D %" PRIu64 ", offset =3D %" = PRIu64 ", len =3D %" PRIu64 nbd_co_send_extents(uint64_t cookie, unsigned int extents, uint32_t id, ui= nt64_t length, int last) "Send block status reply: cookie =3D %" PRIu64 ", = extents =3D %u, context =3D %d (extents cover %" PRIu64 " bytes, last chunk= =3D %d)" nbd_co_send_chunk_error(uint64_t cookie, int err, const char *errname, con= st char *msg) "Send structured error reply: cookie =3D %" PRIu64 ", error = =3D %d (%s), msg =3D '%s'" nbd_co_receive_request_decode_type(uint64_t cookie, uint16_t type, const c= har *name) "Decoding type: cookie =3D %" PRIu64 ", type =3D %" PRIu16 " (%s= )" -nbd_co_receive_request_payload_received(uint64_t cookie, uint32_t len) "Pa= yload received: cookie =3D %" PRIu64 ", len =3D %" PRIu32 -nbd_co_receive_align_compliance(const char *op, uint64_t from, uint32_t le= n, uint32_t align) "client sent non-compliant unaligned %s request: from=3D= 0x%" PRIx64 ", len=3D0x%" PRIx32 ", align=3D0x%" PRIx32 +nbd_co_receive_request_payload_received(uint64_t cookie, uint64_t len) "Pa= yload received: cookie =3D %" PRIu64 ", len =3D %" PRIu64 +nbd_co_receive_align_compliance(const char *op, uint64_t from, uint64_t le= n, uint32_t align) "client sent non-compliant unaligned %s request: from=3D= 0x%" PRIx64 ", len=3D0x%" PRIx64 ", align=3D0x%" PRIx32 nbd_trip(void) "Reading request" # client-connection.c --=20 2.41.0