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2011-12-22qemu-nbd: throttle requestsPaolo Bonzini1-3/+22
Limiting the number of in-flight requests is implemented very simply with a can_read callback. It does not require a semaphore, unlike the client side in block/nbd.c, because we can throttle directly the creation of coroutines. The client side can have a coroutine created at any time when an I/O request is made. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2011-12-22qemu-nbd: asynchronous operationPaolo Bonzini1-21/+53
Using coroutines enable asynchronous operation on both the network and the block side. Network can be owned by two coroutines at the same time, one writing and one reading. On the send side, mutual exclusion is guaranteed by a CoMutex. On the receive side, mutual exclusion is guaranteed because new coroutines immediately start receiving data, and no new coroutines are created as long as the previous one is receiving. Between receive and send, qemu-nbd can have an arbitrary number of in-flight block transfers. Throttling is implemented by the next patch. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2011-12-22qemu-nbd: add client pointer to NBDRequestPaolo Bonzini1-21/+27
By attaching a client to an NBDRequest, we can avoid passing around the socket descriptor and data buffer. Also, we can now manage the reference count for the client in nbd_request_get/put request instead of having to do it ourselved in nbd_read. This simplifies things when coroutines are used. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2011-12-22qemu-nbd: move client handling to nbd.cPaolo Bonzini1-3/+59
This patch sets up the fd handler in nbd.c instead of qemu-nbd.c. It introduces NBDClient, which wraps the arguments to nbd_trip in a single structure, so that we can add a notifier to it. This way, qemu-nbd can know about disconnections. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2011-12-22qemu-nbd: introduce NBDRequestPaolo Bonzini1-14/+51
Move the buffer from NBDExport to a new structure, so that it will be possible to have multiple in-flight requests for the same export (and for the same client too---we get that for free). Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2011-12-22qemu-nbd: introduce NBDExportPaolo Bonzini1-16/+48
Wrap the common parameters of nbd_trip and nbd_negotiate in a single opaque struct. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2011-12-22qemu-nbd: introduce nbd_do_receive_requestPaolo Bonzini1-21/+47
Group the receiving of a response and the associated data into a new function. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2011-12-22qemu-nbd: more robust handling of invalid requestsPaolo Bonzini1-27/+30
Fail invalid requests with EINVAL instead of dropping them into the void. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2011-12-22qemu-nbd: introduce nbd_do_send_replyPaolo Bonzini1-14/+32
Group the sending of a reply and the associated data into a new function. Without corking, the caller would be forced to leave 12 free bytes at the beginning of the data pointer. Not too ugly, but still ugly. :) Using nbd_do_send_reply everywhere will help when the routine will set up the write handler that re-enters the send coroutine. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2011-12-22qemu-nbd: simplify nbd_tripPaolo Bonzini1-17/+8
Use TCP_CORK to remove a violation of encapsulation, that would later require nbd_trip to know too much about an NBD reply. We could also switch to sendmsg (qemu_co_sendv) later, it is even easier once coroutines are in. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2011-12-22qemu-nbd: remove data_size argument to nbd_tripPaolo Bonzini1-3/+3
The size of the buffer is in practice part of the protocol. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2011-12-22qemu-nbd: remove offset argument to nbd_tripPaolo Bonzini1-5/+3
The argument is write-only. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2011-12-22Update ioctl order in nbd_init() to detect EBUSYChunyan Liu1-18/+9
Update ioctl(s) in nbd_init() to detect device busy early. Current nbd_init() issues NBD_CLEAR_SOCKET before NBD_SET_SOCKET, if issuing "qemu-nbd -c /dev/nbd0 disk.img" twice, the second time won't detect EBUSY in nbd_init(), but in nbd_client will report EBUSY and do clear socket (the 1st time command will be affacted too because of no socket any more.) No change to previous version. Signed-off-by: Chunyan Liu <cyliu@suse.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2011-12-22nbd: add support for NBD_CMD_TRIMPaolo Bonzini1-2/+13
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2011-12-22nbd: add support for NBD_CMD_FLUSHPaolo Bonzini1-1/+14
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2011-12-22nbd: add support for NBD_CMD_FLAG_FUAPaolo Bonzini1-2/+11
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2011-12-22nbd: fix error handling in the serverPaolo Bonzini1-9/+12
bdrv_read and bdrv_write return negative errno values, not -1. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2011-12-22nbd: switch to asynchronous operationPaolo Bonzini1-0/+8
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2011-12-02fix spelling in main directoryDong Xu Wang1-2/+2
Signed-off-by: Dong Xu Wang <wdongxu@linux.vnet.ibm.com> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
2011-11-11nbd: treat EPIPE from NBD_DO_IT as successPaolo Bonzini1-0/+7
This can be seen with "qemu-nbd -v -c", which returns 1 instead of 0 when you disconnect with "qemu-nbd -d". Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-09-21nbd: fix non-Linux build failurePaolo Bonzini1-1/+1
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-09-19nbd: support NBD_SET_FLAGS ioctlPaolo Bonzini1-0/+8
The nbd kernel module cannot enable DISCARD requests unless it is informed about it. The flags field in the header is used for this, and this patch adds support for it. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-09-19nbd: sync API definitions with upstreamPaolo Bonzini1-0/+2
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-09-19nbd: support feature negotiationPaolo Bonzini1-7/+25
nbd supports writing flags in bytes 24...27 of the header, and uses that for the read-only flag. Add support for it in qemu-nbd. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-09-12nbd: Clean up use of block_int.hMarkus Armbruster1-0/+1
Signed-off-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-07-25Wrap recv to avoid warningsBlue Swirl1-1/+1
Avoid warnings like these by wrapping recv(): CC slirp/ip_icmp.o /src/qemu/slirp/ip_icmp.c: In function 'icmp_receive': /src/qemu/slirp/ip_icmp.c:418:5: error: passing argument 2 of 'recv' from incompatible pointer type [-Werror] /usr/local/lib/gcc/i686-mingw32msvc/4.6.0/../../../../i686-mingw32msvc/include/winsock2.h:547:32: note: expected 'char *' but argument is of type 'struct icmp *' Remove also casts used to avoid warnings. Reviewed-by: Anthony Liguori <aliguori@us.ibm.com> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2011-04-07NBD: Use qemu_socket functions to open TCP and UNIX socketsNick Thomas1-129/+29
This commit has the side-effect of making the qemu-nbd binary capable of binding to IPv6 addresses. ("-b ::1", for instance). block/nbd.c fails to parse IPv6 IP addresses correctly at this point, but will work over IPv6 when given a hostname. It still works over IPv4 as before. We move the qemu-sockets object from the 'common' to the 'block' list in the Makefile. The common list includes the block list, so this is effectively a no-op for the rest of the code. We also add 32-bit 'magic' attributes to nbd_(request|reply) to facilitate calculating maximum request/response sizes later. Signed-off-by: Nick Thomas <nick@bytemark.co.uk> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-04-07NBD library: whitespace changesNick Thomas1-417/+418
Signed-off-by: Nick Thomas <nick@bytemark.co.uk> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2010-10-03nbd: Haiku has _IO() in its BSD compatibility layerAndreas Färber1-1/+1
Signed-off-by: Andreas Färber <andreas.faerber@web.de> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2010-09-21Improve qemu-nbd performance by 4400 %Laurent Vivier1-7/+18
This patch allows to reduce the boot time from an NBD server from 225 seconds to 5 seconds (time between the "boot cd:0" and the kernel init) for the following command lines: ./qemu-nbd -t ../ISO/debian-500-powerpc-netinst.iso and ./ppc-softmmu/qemu-system-ppc -cdrom nbd:localhost:1024 This patch combines the reply header and payload send operation. Signed-off-by: Laurent Vivier <laurent@vivier.eu> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2010-09-08Merge remote branch 'kwolf/for-anthony' into stagingAnthony Liguori1-12/+106
2010-09-04Remove unused argument for nbd_client()Jes Sorensen1-2/+2
Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2010-08-30nbd: Introduce NBD named exports.Laurent Vivier1-12/+106
This patch allows to connect Qemu using NBD protocol to an nbd-server using named exports. For instance, if on the host "isoserver", in /etc/nbd-server/config, you have: [generic] [debian-500-ppc-netinst] exportname = /ISO/debian-500-powerpc-netinst.iso [Fedora-10-ppc-netinst] exportname = /ISO/Fedora-10-ppc-netinst.iso You can connect to it, using: qemu -cdrom nbd:isoserver:exportname=debian-500-ppc-netinst qemu -cdrom nbd:isoserver:exportname=Fedora-10-ppc-netinst NOTE: you need at least nbd-server 2.9.18 Signed-off-by: Laurent Vivier <laurent@vivier.eu> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2010-05-22Fix %lld or %llx printf format useBlue Swirl1-2/+1
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2009-07-16Update to a hopefully more future proof FSF addressBlue Swirl1-2/+1
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2009-05-21Cast pointer arguments of get/setsockopt, send to void * to keep GCCmalc1-1/+2
from producing a warning about pointer type mismatches with Winsock Signed-off-by: malc <av1474@comtv.ru>
2009-04-05Fix some win32 compile warningsblueswir11-1/+1
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6984 c046a42c-6fe2-441c-8c8c-71466251a162
2009-01-04Update FSF address in GPL/LGPL boilerplateaurel321-1/+1
The attached patch updates the FSF address in the GPL/LGPL boilerplate in most GPL/LGPLed files, and also in COPYING.LIB. Signed-off-by: Stuart Brady <stuart.brady@gmail.com> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6162 c046a42c-6fe2-441c-8c8c-71466251a162
2008-11-22Use qemu_isfoobar and qemu_towombat versions, based on patch by Christoph Eggerblueswir11-8/+8
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5774 c046a42c-6fe2-441c-8c8c-71466251a162
2008-09-15Use common objects for qemu-img and qemu-nbdaliguori1-31/+55
Right now, we sprinkle #if defined(QEMU_IMG) && defined(QEMU_NBD) all over the code. It's ugly and causes us to have to build multiple object files for linking against qemu and the tools. This patch introduces a new file, qemu-tool.c which contains enough for qemu-img, qemu-nbd, and QEMU to all share the same objects. This also required getting qemu-nbd to be a bit more Windows friendly. I also changed the Windows block-raw to use normal IO instead of overlapping IO since we don't actually do AIO yet on Windows. I changed the various #if 0's to #if WIN32_AIO to make it easier for someone to eventually fix AIO on Windows. After this patch, there are no longer any #ifdef's related to qemu-img and qemu-nbd. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5226 c046a42c-6fe2-441c-8c8c-71466251a162
2008-09-10qemu-nbd: remove useless parameter from nbd_negotiate() (Laurent Vivier)aliguori1-1/+1
This patch removes "BlockDriverState *bs" from nbd_negotiate() because it is not used. Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.fr> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5186 c046a42c-6fe2-441c-8c8c-71466251a162
2008-08-02Fix compilation of nbd on Solaris (Andreas Faerber)aliguori1-0/+3
Compilation of QEMU is currently broken on Solaris due to nbd's use of _IO and due to network libraries not being linked into qemu-img. The attached patch adds the appropriate libraries (copied from Makefile.target) and includes an additional Sun-specific header for _IO. With these fixes it compiles okay, on OpenSolaris snv_93 (amd64). Signed-off-by: Andreas Faerber <andreas.faerber@web.de> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4982 c046a42c-6fe2-441c-8c8c-71466251a162
2008-07-04Add missing returnmalc1-0/+1
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4846 c046a42c-6fe2-441c-8c8c-71466251a162
2008-07-03Allow QEMU to connect directly to an NBD server, by Laurent Vivier.ths1-68/+143
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4838 c046a42c-6fe2-441c-8c8c-71466251a162
2008-07-03Add a parameter to disable host cache, by Laurent Vivier.ths1-9/+5
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4836 c046a42c-6fe2-441c-8c8c-71466251a162
2008-07-03Merge NBD client/server, by Laurent Vivier.ths1-6/+68
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4834 c046a42c-6fe2-441c-8c8c-71466251a162
2008-07-02Cleanup qemu-nbd related code, by Laurent Vivier.ths1-2/+2
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4829 c046a42c-6fe2-441c-8c8c-71466251a162
2008-06-06Fix compiler warning.ths1-1/+1
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4676 c046a42c-6fe2-441c-8c8c-71466251a162
2008-05-27qemu-nbd tool (Anthony Liguori)bellard1-0/+500
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4596 c046a42c-6fe2-441c-8c8c-71466251a162
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