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2012-07-24qemu-nbd: add --cache and --aio optionsPaolo Bonzini1-2/+40
Add two options to tune the I/O implementation of qemu-nbd, matching the possibilities given by the QEMU -drive option. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-07-24qemu-nbd: reorganize help messagePaolo Bonzini1-11/+22
This patch separates qemu-nbd's options in logical groups, thus making the help message easier to read. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-04-19nbd: do not include block_int.hPaolo Bonzini1-2/+2
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-04-19nbd: consistently return negative errno valuesPaolo Bonzini1-7/+8
In the next patch we need to look at the return code of nbd_wr_sync. To avoid percolating the socket_error() ugliness all around, let's handle errors by returning negative errno values. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-04-19nbd: consistently check for <0 or >=0Paolo Bonzini1-13/+13
This prepares for the following patch, which changes -1 return values to negative errno. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-02-17open /dev/nbd in nbd_client_threadPaolo Bonzini1-18/+16
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-02-17do not chdir(/) in qemu-nbd before opening all filesMichael Tokarev1-1/+7
When qemu-nbd becomes a daemon it calls daemon(3) with nochdir=0, so daemon(3) changes current directory to /. But at this time, qemu-nbd did not open any user-specified files yet, so by changing current directory, all non-absolute paths becomes wrong. The solution is to pass nochdir=1 to daemon(3) function, and to chdir("/") after all init has been performed, before entering the main loop, -- just like a good daemon should do. This patch is applicable for -stable. Signed-off-by: Michael Tokarev <mjt@tls.msk.ru> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-01-06qemu-nbd: drop loop which can never loopStefan Hajnoczi1-6/+4
For some reason nbd_client_thread() has a do..while loop which can never loop, the condition is bogus because we would take a goto instead. Drop the loop. Reported-by: Dr David Alan Gilbert <davidagilbert@uk.ibm.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
2011-12-22qemu-nbd: move client handling to nbd.cPaolo Bonzini1-10/+4
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: use common main loopPaolo Bonzini1-67/+45
Using a single main loop for sockets will help yielding from the socket coroutine back to the main loop, and later reentering it. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2011-12-22qemu-nbd: introduce NBDExportPaolo Bonzini1-10/+5
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: remove data_size argument to nbd_tripPaolo Bonzini1-3/+1
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 Bonzini1-2/+1
The argument is write-only. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2011-11-11qemu-nbd: open the block device after starting the client threadPaolo Bonzini1-17/+17
This is cleaner, because we do not need to close the block device when there is an error opening /dev/nbdX. It was done this way only to print errors before daemonizing. At the same time, use atexit to ensure that the block device is closed whenever we exit. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-11-11qemu-nbd: fix socket creation racePaolo Bonzini1-15/+15
Now that the client and server are in the same process, there is no need to race on the creation of the socket. We can open the listening socket before starting the client thread. This avoids that "qemu-nbd -v -c" prints this once before connecting successfully to the socket: connect(unix:/var/lock/qemu-nbd-nbd0): No such file or directory Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-11-11qemu-nbd: print error messages from the daemon through a pipePaolo Bonzini1-9/+59
In order to get nice error messages, keep the qemu-nbd process running until before issuing NBD_DO_IT and connected to the daemon with a pipe. This lets the qemu-nbd process relay error messages from the daemon and exit with a nonzero status if appropriate. Suggested-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-11-11qemu-nbd: move client to a threadPaolo Bonzini1-80/+93
This avoids that qemu-nbd uses both forking and threads, which do not behave well together. qemu-nbd is already Unix only, and there is no qemu_thread_join, so for now use pthreads. Since the parent and child no longer have separate file descriptors, we can open the NBD device before daemonizing, instead of checking with access(2) and restricting the open to the client only. Reported-by: Pierre Riteau <pierre.riteau@irisa.fr> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-11-11qemu-nbd: rename socket variablePaolo Bonzini1-13/+12
It will be moved to a global variable by the next patch, and it would conflict with the socket function. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-11-11qemu-nbd: trap SIGTERMPaolo Bonzini1-5/+29
The client process right now uses SIGTERM to interrupt the server side. This does not affect the exit status of "qemu-nbd -v -c" because the server is a child process. This will change when both sides will be in the same process, and anyway cleaning up things nicely upon SIGTERM is good practice. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-09-19nbd: support feature negotiationPaolo Bonzini1-7/+6
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>
2011-09-09Fix include statements for qemu-common.hStefan Weil1-1/+1
* qemu-common.h is not a system include file, so it should be included with "" instead of <>. Otherwise incremental builds might fail because only local include files are checked for changes. * linux-user/syscall.c included the file twice. Cc: Riku Voipio <riku.voipio@iki.fi> Cc: Jan Kiszka <jan.kiszka@siemens.com> Acked-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Stefan Weil <weil@mail.berlios.de> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
2011-08-20Use glib memory allocation and free functionsAnthony Liguori1-2/+2
qemu_malloc/qemu_free no longer exist after this commit. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-06-14Darwin: Fix compilation warning regarding the deprecated daemon() functionAlexandre Raymond1-1/+1
Changes since v1: create a wrapper function named qemu_daemon() in oslib-posix.c instead of putting the OS specific workaround in qemu-nbd.c directly. On OSX >= 10.5, daemon() is deprecated, resulting in the following warning: ----8<---- qemu-nbd.c: In function ‘main’: qemu-nbd.c:371: warning: ‘daemon’ is deprecated (declared at /usr/include/stdlib.h:289) ----8<---- The following trick, used in mDNSResponder, takes care of this warning: http://www.opensource.apple.com/source/mDNSResponder/mDNSResponder-258.18/mDNSPosix/PosixDaemon.c On OSX, it temporarily renames the daemon() function before including stdlib.h and declares it manually as an extern function. This way, the compiler does not see the declaration from stdlib.h and thus does not display the warning. Signed-off-by: Alexandre Raymond <cerbere@gmail.com> Cc: Blue Swirl <blauwirbel@gmail.com> Signed-off-by: Andreas Färber <andreas.faerber@web.de>
2011-06-08block: clarify the meaning of BDRV_O_NOCACHEChristoph Hellwig1-1/+1
Change BDRV_O_NOCACHE to only imply bypassing the host OS file cache, but no writeback semantics. All existing callers are changed to also specify BDRV_O_CACHE_WB to give them writeback semantics. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2010-12-17Remove NULL checks for bdrv_new return valueKevin Wolf1-2/+0
It's an indirect call to qemu_malloc, which never returns an error. Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2010-09-21nbd: correctly manage default portLaurent Vivier1-3/+3
block/nbd.c: use default port number when none is specified qemu-nbd.c: use IANA-assigned port number: 10809 Signed-off-by: Laurent Vivier <laurent@vivier.eu> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2010-09-21use qemu_blockalign consistentlyChristoph Hellwig1-1/+1
Use qemu_blockalign for all allocations in the block layer. This allows increasing the required alignment, which is need to support O_DIRECT on devices with large block sizes. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2010-09-08Merge remote branch 'kwolf/for-anthony' into stagingAnthony Liguori1-1/+3
2010-09-04Respect return value from nbd_client()Jes Sorensen1-1/+4
Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2010-09-04Remove unused argument for nbd_client()Jes Sorensen1-1/+1
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 Vivier1-1/+3
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>
2010-05-17qemu-nbd: Improve error reportingRyota Ozaki1-10/+24
- use err(3) instead of errx(3) if errno is available to report why failed - let fail prior to daemon(3) if opening a nbd file is likely to fail after daemonizing to avoid silent failure exit - add missing 'ret = 1' when unix_socket_outgoing failed Signed-off-by: Ryota Ozaki <ozaki.ryota@gmail.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2010-04-23Replace calls of old bdrv_openKevin Wolf1-1/+1
What is known today as bdrv_open2 becomes the new bdrv_open. All remaining callers of the old function are converted to the new one. In some places they even know the right format, so they should have used bdrv_open2 from the beginning. Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2010-03-27qemu-nbd: Fix invalid usage of the first argument of errxRyota Ozaki1-17/+17
errx takes the exit status of a process as the first argument. Passing errno to it is wrong. Instead the patch lets errx take EXIT_FAILURE. Signed-off-by: Ryota Ozaki <ozaki.ryota@gmail.com> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
2010-03-27qemu-nbd: Fix return value handling of bdrv_openRyota Ozaki1-1/+1
bdrv_open may return -errno so we have to check if the return value is '< 0', not '== -1'. Signed-off-by: Ryota Ozaki <ozaki.ryota@gmail.com> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
2010-03-17read-only: minor cleanupNaphtali Sprei1-0/+1
Really use read-only flags for opening the file when asked for read-only Signed-off-by: Naphtali Sprei <nsprei@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2010-01-26win32: pair qemu_memalign() with qemu_vfree()Herve Poussineau1-1/+1
Win32 suffers from a very big memory leak when dealing with SCSI devices. Each read/write request allocates memory with qemu_memalign (ie VirtualAlloc) but frees it with qemu_free (ie free). Pair all qemu_memalign() calls with qemu_vfree() to prevent such leaks. Signed-off-by: Herve Poussineau <hpoussin@reactos.org> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2010-01-20Clean-up a little bit the RW related bits of BDRV_O_FLAGS. BDRV_O_RDONLY ↵Naphtali Sprei1-1/+1
gone (and so is BDRV_O_ACCESS). Default value for bdrv_flags (0/zero) is READ-ONLY. Need to explicitly request READ-WRITE. Instead of using the field 'readonly' of the BlockDriverState struct for passing the request, pass the request in the flags parameter to the function. Signed-off-by: Naphtali Sprei <nsprei@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2009-12-23qemu-nbd: fix OpenBSD linker warningBlue Swirl1-1/+2
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2009-12-23Compile qemu-nbd also on OpenBSD and SolarisBlue Swirl1-0/+1
basename() needs #include <libgen.h>. No prototype for daemon() is available on Solaris, but link succeeds. Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2009-07-31Fix Sparse warnings: "Using plain integer as NULL pointer"Blue Swirl1-16/+16
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>
2009-06-15Fix warning in qemu-nbd.cAnthony Liguori1-2/+6
qemu-nbd.c:349: error: ignoring return value of 'daemon', declared with attribute warn_unused_result Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2009-02-05toplevel: remove error handling from qemu_malloc() callers (Avi Kivity)aliguori1-2/+0
Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6531 c046a42c-6fe2-441c-8c8c-71466251a162
2009-01-08qemu-nbd: fix options: -b (--bind) expects an argument (IFACE) (Uri Lublin)aliguori1-1/+1
Rebased for qemu tree. Signed-off-by: Uri Lublin <uril@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6246 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
2008-10-26Fix undeclared symbol warnings from sparseblueswir11-1/+1
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5539 c046a42c-6fe2-441c-8c8c-71466251a162
2008-10-14Expand cache= option and use write-through caching by defaultaliguori1-1/+1
This patch changes the cache= option to accept none, writeback, or writethough to control the host page cache behavior. By default, writethrough caching is now used which internally is implemented by using O_DSYNC to open the disk images. When using -snapshot, writeback is used by default since data integrity it not at all an issue. cache=none has the same behavior as cache=off previously. The later syntax is still supported by now deprecated. I also cleaned up the O_DIRECT implementation to avoid many of the #ifdefs. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5485 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
2008-07-18Allow qemu-nbd --version to show the application name dynamically, byths1-2/+2
Carlo Marcelo Arenas Belon. git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4893 c046a42c-6fe2-441c-8c8c-71466251a162
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