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* block: Document -drive problematic code and bugsMarkus Armbruster2017-04-031-0/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | -blockdev and blockdev_add convert their arguments via QObject to BlockdevOptions for qmp_blockdev_add(), which converts them back to QObject, then to a flattened QDict. The QDict's members are typed according to the QAPI schema. -drive converts its argument via QemuOpts to a (flat) QDict. This QDict's members are all QString. Thus, the QType of a flat QDict member depends on whether it comes from -drive or -blockdev/blockdev_add, except when the QAPI type maps to QString, which is the case for 'str' and enumeration types. The block layer core extracts generic configuration from the flat QDict, and the block driver extracts driver-specific configuration. Both commonly do so by converting (parts of) the flat QDict to QemuOpts, which turns all values into strings. Not exactly elegant, but correct. However, A few places access the flat QDict directly: * Most of them access members that are always QString. Correct. * bdrv_open_inherit() accesses a boolean, carefully. Correct. * nfs_config() uses a QObject input visitor. Correct only because the visited type contains nothing but QStrings. * nbd_config() and ssh_config() use a QObject input visitor, and the visited types contain non-QStrings: InetSocketAddress members @numeric, @to, @ipv4, @ipv6. -drive works as long as you don't try to use them (they're all optional). @to is ignored anyway. Reproducer: -drive driver=ssh,server.host=h,server.port=22,server.ipv4,path=p -drive driver=nbd,server.type=inet,server.data.host=h,server.data.port=22,server.data.ipv4 both fail with "Invalid parameter type for 'data.ipv4', expected: boolean" Add suitable comments to all these places. Mark the buggy ones FIXME. "Fortunately", -drive's driver-specific options are entirely undocumented. Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-id: 1490895797-29094-5-git-send-email-armbru@redhat.com [mreitz: Fixed two typos] Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Max Reitz <mreitz@redhat.com>
* qapi: Drop unused non-strict qobject input visitorMarkus Armbruster2017-03-051-1/+1
| | | | | | | | | | The split between tests/test-qobject-input-visitor.c and tests/test-qobject-input-strict.c now makes less sense than ever. The next commit will take care of that. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <1488544368-30622-20-git-send-email-armbru@redhat.com>
* nfs: do not use aio_context_acquire/releasePaolo Bonzini2017-02-271-4/+19
| | | | | | | | | | | | | | Now that all bottom halves and callbacks take care of taking the AioContext lock, we can migrate some users away from it and to a specific QemuMutex or CoMutex. Protect libnfs calls with a QemuMutex. Callbacks are invoked using bottom halves, so we don't even have to drop it around callback invocations. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-id: 20170222180725.28611-3-pbonzini@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* block/nfs: try to avoid the bounce buffer in pwritevPeter Lieven2017-02-241-7/+16
| | | | | | | | | | if the passed qiov contains exactly one iov we can pass the buffer directly. Signed-off-by: Peter Lieven <pl@kamp.de> Reviewed-by: Jeff Cody <jcody@redhat.com> Message-id: 1487349541-10201-3-git-send-email-pl@kamp.de Signed-off-by: Jeff Cody <jcody@redhat.com>
* block/nfs: convert to preadv / pwritevPeter Lieven2017-02-241-18/+15Star
| | | | | | | Signed-off-by: Peter Lieven <pl@kamp.de> Reviewed-by: Jeff Cody <jcody@redhat.com> Message-id: 1487349541-10201-2-git-send-email-pl@kamp.de Signed-off-by: Jeff Cody <jcody@redhat.com>
* block: Don't bother asserting type of output visitor's outputMarkus Armbruster2017-02-221-2/+0Star
| | | | | | | | | | | | | | | | | After a visit of a complex QAPI type FOO ov = qobject_output_visitor_new(&foo); visit_type_FOO(ov, NULL, expr, &error_abort); visit_complete(ov, &foo); we can safely assume qobject_type(foo) is QTYPE_QDICT. We do in many places, but occasionally assert qobject_type(obj) == QTYPE_QDICT. Don't. The appropriate place to check such fundamental properties of QAPI visitors is the test suite. Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <1487363905-9480-15-git-send-email-armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
* block: explicitly acquire aiocontext in bottom halves that need itPaolo Bonzini2017-02-211-1/+2
| | | | | | | | | Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Fam Zheng <famz@redhat.com> Reviewed-by: Daniel P. Berrange <berrange@redhat.com> Message-id: 20170213135235.12274-15-pbonzini@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* block: explicitly acquire aiocontext in callbacks that need itPaolo Bonzini2017-02-211-0/+6
| | | | | | | | | | | | This covers both file descriptor callbacks and polling callbacks, since they execute related code. Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Fam Zheng <famz@redhat.com> Reviewed-by: Daniel P. Berrange <berrange@redhat.com> Message-id: 20170213135235.12274-14-pbonzini@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* block/nfs: fix naming of runtime optsPeter Lieven2017-02-121-23/+23
| | | | | | | | | | | | | | | | | | | | commit 94d6a7a accidentally left the naming of runtime opts and QAPI scheme inconsistent. As one consequence passing of parameters in the URI is broken. Sync the naming of the runtime opts to the QAPI scheme. Please note that this is technically backwards incompatible with the 2.8 release, but the 2.8 release is the only version that had the wrong naming. Furthermore release 2.8 suffered from a NULL pointer dereference during URI parsing. Fixes: 94d6a7a76e9df9919629428f6c598e2b97d9426c Cc: qemu-stable@nongnu.org Signed-off-by: Peter Lieven <pl@kamp.de> Message-id: 1485942829-10756-3-git-send-email-pl@kamp.de [mreitz: Fixed commit message] Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Max Reitz <mreitz@redhat.com>
* block/nfs: fix NULL pointer dereference in URI parsingPeter Lieven2017-02-121-1/+2
| | | | | | | | | | | | parse_uint_full wants to put the parsed value into the variable passed via its second argument which is NULL. Fixes: 94d6a7a76e9df9919629428f6c598e2b97d9426c Cc: qemu-stable@nongnu.org Signed-off-by: Peter Lieven <pl@kamp.de> Reviewed-by: Eric Blake <eblake@redhat.com> Message-id: 1485942829-10756-2-git-send-email-pl@kamp.de Signed-off-by: Max Reitz <mreitz@redhat.com>
* aio: add AioPollFn and io_poll() interfaceStefan Hajnoczi2017-01-031-3/+4
| | | | | | | | | | | | The new AioPollFn io_poll() argument to aio_set_fd_handler() and aio_set_event_handler() is used in the next patch. Keep this code change separate due to the number of files it touches. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Message-id: 20161201192652.9509-3-stefanha@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* block/nfs: fix QMP to match debug optionPrasanna Kumar Kalever2016-12-051-2/+2
| | | | | | | | | | | | | | | | | | | | | The QMP definition of BlockdevOptionsNfs: { 'struct': 'BlockdevOptionsNfs', 'data': { 'server': 'NFSServer', 'path': 'str', '*user': 'int', '*group': 'int', '*tcp-syn-count': 'int', '*readahead-size': 'int', '*page-cache-size': 'int', '*debug-level': 'int' } } To make this consistent with other block protocols like gluster, lets change s/debug-level/debug/ Suggested-by: Eric Blake <eblake@redhat.com> Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Jeff Cody <jcody@redhat.com>
* nfs: Fix memory leak in nfs_file_create()Kevin Wolf2016-11-111-0/+1
| | | | | | | The leak was introduced in commit 94d6a7a7. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
* block/nfs: Introduce runtime_opts in NFSAshijeet Acharya2016-10-311-93/+349
| | | | | | | | | | | | Make NFS block driver use various fine grained runtime_opts. Set .bdrv_parse_filename() to nfs_parse_filename() and introduce two new functions nfs_parse_filename() and nfs_parse_uri() to help parsing the URI. Add a new option "server" which then accepts a new struct NFSServer. Signed-off-by: Ashijeet Acharya <ashijeetacharya@gmail.com> [ kwolf: Fixed client->path ] Signed-off-by: Kevin Wolf <kwolf@redhat.com>
* block: only call aio_poll on the current thread's AioContextPaolo Bonzini2016-10-281-0/+1
| | | | | | | | | | | | | | | | | | aio_poll is not thread safe; for example bdrv_drain can hang if the last in-flight I/O operation is completed in the I/O thread after the main thread has checked bs->in_flight. The bug remains latent as long as all of it is called within aio_context_acquire/aio_context_release, but this will change soon. To fix this, if bdrv_drain is called from outside the I/O thread, signal the main AioContext through a dummy bottom half. The event loop then only runs in the I/O thread. Reviewed-by: Fam Zheng <famz@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <1477565348-5458-18-git-send-email-pbonzini@redhat.com> Signed-off-by: Fam Zheng <famz@redhat.com>
* nfs: use BDRV_POLL_WHILEPaolo Bonzini2016-10-281-18/+28
| | | | | | | | | | | This will make it possible to use nfs_get_allocated_file_size on a file that is not in the main AioContext. Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Fam Zheng <famz@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <1477565348-5458-10-git-send-email-pbonzini@redhat.com> Signed-off-by: Fam Zheng <famz@redhat.com>
* nfs: move nfs_set_events out of the while loopsPaolo Bonzini2016-10-281-4/+4
| | | | | | | | | | | | nfs_set_events only needs to be called once before entering the while loop; afterwards, nfs_process_read and nfs_process_write take care of it. Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Fam Zheng <famz@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <1477565348-5458-9-git-send-email-pbonzini@redhat.com> Signed-off-by: Fam Zheng <famz@redhat.com>
* block: use aio_bh_schedule_oneshotPaolo Bonzini2016-10-071-5/+2Star
| | | | | | | | | | This simplifies bottom half handlers by removing calls to qemu_bh_delete and thus removing the need to stash the bottom half pointer in the opaque datum. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
* coroutine: move entry argument to qemu_coroutine_createPaolo Bonzini2016-07-131-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In practice the entry argument is always known at creation time, and it is confusing that sometimes qemu_coroutine_enter is used with a non-NULL argument to re-enter a coroutine (this happens in block/sheepdog.c and tests/test-coroutine.c). So pass the opaque value at creation time, for consistency with e.g. aio_bh_new. Mostly done with the following semantic patch: @ entry1 @ expression entry, arg, co; @@ - co = qemu_coroutine_create(entry); + co = qemu_coroutine_create(entry, arg); ... - qemu_coroutine_enter(co, arg); + qemu_coroutine_enter(co); @ entry2 @ expression entry, arg; identifier co; @@ - Coroutine *co = qemu_coroutine_create(entry); + Coroutine *co = qemu_coroutine_create(entry, arg); ... - qemu_coroutine_enter(co, arg); + qemu_coroutine_enter(co); @ entry3 @ expression entry, arg; @@ - qemu_coroutine_enter(qemu_coroutine_create(entry), arg); + qemu_coroutine_enter(qemu_coroutine_create(entry, arg)); @ reentry @ expression co; @@ - qemu_coroutine_enter(co, NULL); + qemu_coroutine_enter(co); except for the aforementioned few places where the semantic patch stumbled (as expected) and for test_co_queue, which would otherwise produce an uninitialized variable warning. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Fam Zheng <famz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
* block/nfs: add support for libnfs pagecachePeter Lieven2016-06-291-1/+36
| | | | | | | | | | | | | | | | | | upcoming libnfs will have support for a read cache that can significantly help to speed up requests since libnfs by design circumvents the kernel cache. Example: qemu -cdrom nfs://127.0.0.1/iso/my.iso?pagecache=1024 The pagecache parameters takes the maximum amount of pages to cache. A page in libnfs is always the NFS_BLKSIZE which is 4KB. Signed-off-by: Peter Lieven <pl@kamp.de> Reviewed-by: Jeff Cody <jcody@redhat.com> Message-id: 1463662083-20814-3-git-send-email-pl@kamp.de Signed-off-by: Jeff Cody <jcody@redhat.com>
* block/nfs: refuse readahead if cache.direct is onPeter Lieven2016-06-291-4/+16
| | | | | | | | | | | | | | if we open a NFS export with disabled cache we should refuse the readahead feature as it will cache data inside libnfs. If a export was opened with readahead enabled it should futher not be allowed to disable the cache while running. Cc: qemu-stable@nongnu.org Signed-off-by: Peter Lieven <pl@kamp.de> Reviewed-by: Jeff Cody <jcody@redhat.com> Message-id: 1463662083-20814-2-git-send-email-pl@kamp.de Signed-off-by: Jeff Cody <jcody@redhat.com>
* block/nfs: add missing #include "qemu/cutils.h"Stefan Hajnoczi2016-03-301-0/+1
| | | | | | | | | | | parse_uint_full() used to be included from qemu-common.h but was moved to qemu/cutils.h in commit f348b6d1a53e5271cf1c9f9acc4646b4b98c1771 ("util: move declarations out of qemu-common.h"). Cc: Veronia Bahaa <veroniabahaa@gmail.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: 1459341994-20567-3-git-send-email-stefanha@redhat.com Signed-off-by: Jeff Cody <jcody@redhat.com>
* block/nfs: add missing #include "qapi/error.h"Stefan Hajnoczi2016-03-301-0/+1
| | | | | | | | | | | error_setg() used to be included indirectly through qemu/osdep.h. Since commit da34e65cb4025728566d6504a99916f6e7e1dd6a ("include/qemu/osdep.h: Don't include qapi/error.h") it requires an explicit include. Cc: Markus Armbruster <armbru@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: 1459341994-20567-2-git-send-email-stefanha@redhat.com Signed-off-by: Jeff Cody <jcody@redhat.com>
* block/nfs: add support for setting debug levelPeter Lieven2016-02-291-0/+12
| | | | | | | | | | | | | recent libnfs versions support logging debug messages. Add support for it in qemu through an URL parameter. Example: qemu -cdrom nfs://127.0.0.1/iso/my.iso?debug=2 Signed-off-by: Peter Lieven <pl@kamp.de> Reviewed-by: Fam Zheng <famz@redhat.com> Message-id: 1447052973-14513-1-git-send-email-pl@kamp.de Signed-off-by: Jeff Cody <jcody@redhat.com>
* block: Clean up includesPeter Maydell2016-01-201-1/+1
| | | | | | | | | | | Clean up includes so that osdep.h is included first and headers which it implies are not included manually. This commit was created with scripts/clean-includes. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
* aio: Add "is_external" flag for event handlersFam Zheng2015-10-231-10/+7Star
| | | | | | | | | | All callers pass in false, and the real external ones will switch to true in coming patches. Signed-off-by: Fam Zheng <famz@redhat.com> Reviewed-by: Jeff Cody <jcody@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
* block/nfs: cache allocated filesize for read-only filesPeter Lieven2015-09-251-0/+36
| | | | | | | | | | | | | | | If the file is readonly its not expected to grow so save the blocking call to nfs_fstat_async and use the value saved at connection time. Also important the monitor (and thus the main loop) will not hang if block device info is queried and the NFS share is unresponsive. Signed-off-by: Peter Lieven <pl@kamp.de> Reviewed-by: Jeff Cody <jcody@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Message-id: 1440671441-7978-1-git-send-email-pl@kamp.de Signed-off-by: Jeff Cody <jcody@redhat.com>
* block/nfs: fix calculation of allocated file sizePeter Lieven2015-09-251-1/+1
| | | | | | | | | | | | st.st_blocks is always counted in 512 byte units. Do not use st.st_blksize as multiplicator which may be larger. Cc: qemu-stable@nongnu.org Signed-off-by: Peter Lieven <pl@kamp.de> Reviewed-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Jeff Cody <jcody@redhat.com> Message-id: 1440067607-14547-1-git-send-email-pl@kamp.de Signed-off-by: Jeff Cody <jcody@redhat.com>
* block/nfs: limit maximum readahead size to 1MBPeter Lieven2015-07-021-0/+7
| | | | | | | | | | | a malicious caller could otherwise specify a very large value via the URI and force libnfs to allocate a large amount of memory for the readahead buffer. Cc: qemu-stable@nongnu.org Signed-off-by: Peter Lieven <pl@kamp.de> Message-id: 1435317241-25585-1-git-send-email-pl@kamp.de Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* block/nfs: Add create_optsMax Reitz2014-12-101-0/+15
| | | | | | | | | | | | | | | | | | | | The nfs protocol driver is capable of creating images, but did not specify any creation options. Fix it. A way to test this issue is the following: $ qemu-img create -f nfs nfs://127.0.0.1/foo.qcow2 64M Without this patch, it segfaults. With this patch, it does not. However, this is not something that should really work; qemu-img should check whether the parameter for the -f option (and -O for convert) is indeed a format, and error out if it is not. Therefore, I am not making it an iotest. Cc: qemu-stable@nongnu.org Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
* block: round up file size to nearest sectorHu Tao2014-09-121-1/+2
| | | | | | | | | | | | | | | | Currently the file size requested by user is rounded down to nearest sector, causing the actual file size could be a bit less than the size user requested. Since some formats (like qcow2) record virtual disk size in bytes, this can make the last few bytes cannot be accessed. This patch fixes it by rounding up file size to nearest sector so that the actual file size is no less than the requested file size. Signed-off-by: Hu Tao <hutao@cn.fujitsu.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
* nfs: Fix leak of opts in nfs_file_openFam Zheng2014-08-291-3/+7
| | | | | | Signed-off-by: Fam Zheng <famz@redhat.com> Reviewed-by: Benoît Canet <benoit.canet@nodalink.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* block: Use g_new() & friends where that makes obvious senseMarkus Armbruster2014-08-201-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | g_new(T, n) is neater than g_malloc(sizeof(T) * n). It's also safer, for two reasons. One, it catches multiplication overflowing size_t. Two, it returns T * rather than void *, which lets the compiler catch more type errors. Patch created with Coccinelle, with two manual changes on top: * Add const to bdrv_iterate_format() to keep the types straight * Convert the allocation in bdrv_drop_intermediate(), which Coccinelle inexplicably misses Coccinelle semantic patch: @@ type T; @@ -g_malloc(sizeof(T)) +g_new(T, 1) @@ type T; @@ -g_try_malloc(sizeof(T)) +g_try_new(T, 1) @@ type T; @@ -g_malloc0(sizeof(T)) +g_new0(T, 1) @@ type T; @@ -g_try_malloc0(sizeof(T)) +g_try_new0(T, 1) @@ type T; expression n; @@ -g_malloc(sizeof(T) * (n)) +g_new(T, n) @@ type T; expression n; @@ -g_try_malloc(sizeof(T) * (n)) +g_try_new(T, n) @@ type T; expression n; @@ -g_malloc0(sizeof(T) * (n)) +g_new0(T, n) @@ type T; expression n; @@ -g_try_malloc0(sizeof(T) * (n)) +g_try_new0(T, n) @@ type T; expression p, n; @@ -g_realloc(p, sizeof(T) * (n)) +g_renew(T, p, n) @@ type T; expression p, n; @@ -g_try_realloc(p, sizeof(T) * (n)) +g_try_renew(T, p, n) Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Jeff Cody <jcody@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
* nfs: Handle failure for potentially large allocationsKevin Wolf2014-08-151-1/+5
| | | | | | | | | | | | Some code in the block layer makes potentially huge allocations. Failure is not completely unexpected there, so avoid aborting qemu and handle out-of-memory situations gracefully. This patch addresses the allocations in the nfs block driver. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Benoit Canet <benoit@irqsave.net>
* block/nfs: add knob to set readaheadPeter Lieven2014-06-261-0/+4
| | | | | | | | | | upcoming libnfs will feature internal readahead support. Add a knob to pass the optional readahead value as a URL parameter. Signed-off-by: Peter Lieven <pl@kamp.de> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
* block/nfs: fix url parameter checkingPeter Lieven2014-06-261-6/+12
| | | | | | | | | | this patch fixes the incorrect usage of strncmp and adds simple error checking by means of parse_uint_full instead of atoi for the supplied URL parameters. Signed-off-by: Peter Lieven <pl@kamp.de> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
* cleanup QEMUOptionParameterChunyan Liu2014-06-161-1/+1
| | | | | | | | | Now that all backend drivers are using QemuOpts, remove all QEMUOptionParameter related codes. Signed-off-by: Dong Xu Wang <wdongxu@linux.vnet.ibm.com> Signed-off-by: Chunyan Liu <cyliu@suse.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* nfs.c: replace QEMUOptionParameter with QemuOptsChunyan Liu2014-06-161-9/+3Star
| | | | | | | Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Chunyan Liu <cyliu@suse.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* block/nfs: fix potential segfault on early callbackPeter Lieven2014-06-161-1/+3
| | | | | | | | | it will happen in the future that the callback of a libnfs call directly invokes the callback. In this case we end up in a segfault because the NFSRPC is gone when we the BH is scheduled. Signed-off-by: Peter Lieven <pl@kamp.de> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* nfs: implement .bdrv_detach/attach_aio_context()Stefan Hajnoczi2014-06-041-24/+57
| | | | | | | | | | | | | | | Drop the assumption that we're using the main AioContext. The following functions need to be converted: * qemu_bh_new() -> aio_bh_new() * qemu_aio_set_fd_handler() -> aio_set_fd_handler() * qemu_aio_wait() -> aio_poll() The .bdrv_detach/attach_aio_context() interfaces also need to be implemented to move the fd handler from the old to the new AioContext. Cc: Peter Lieven <pl@kamp.de> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Peter Lieven <pl@kamp.de>
* block/nfs: Check for NULL server partMax Reitz2014-05-091-0/+4
| | | | | | | | After the URL has been parsed make sure the server part is valid in order to avoid a segmentation fault when calling nfs_mount(). Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* Use error_is_set() only when necessary (again)Markus Armbruster2014-04-251-1/+1
| | | | | | | | | | | error_is_set(&var) is the same as var != NULL, but it takes whole-program analysis to figure that out. Unnecessarily hard for optimizers, static checkers, and human readers. Commit 84d18f0 dumbed it down to obvious, but a few more have crept in since, and documentation was overlooked. Dumb these down, too. Signed-off-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* block/nfs: report errors from libnfsPeter Lieven2014-03-191-0/+3
| | | | | | | | if an NFS operation fails we should report what libnfs knows about the failure. It is likely more than just an error code. Signed-off-by: Peter Lieven <pl@kamp.de> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
* block: add native support for NFSPeter Lieven2014-02-091-0/+439
This patch adds native support for accessing images on NFS shares without the requirement to actually mount the entire NFS share on the host. NFS Images can simply be specified by an url of the form: nfs://<host>/<export>/<filename>[?param=value[&param2=value2[&...]]] For example: qemu-img create -f qcow2 nfs://10.0.0.1/qemu-images/test.qcow2 You need LibNFS from Ronnie Sahlberg available at: git://github.com/sahlberg/libnfs.git for this to work. During configure it is automatically probed for libnfs and support is enabled on-the-fly. You can forbid or enforce libnfs support with --disable-libnfs or --enable-libnfs respectively. Due to NFS restrictions you might need to execute your binaries as root, allow them to open priviledged ports (<1024) or specify insecure option on the NFS server. For additional information on ROOT vs. non-ROOT operation and URL format + parameters see: https://raw.github.com/sahlberg/libnfs/master/README Supported by qemu are the uid, gid and tcp-syncnt URL parameters. LibNFS currently support NFS version 3 only. Signed-off-by: Peter Lieven <pl@kamp.de> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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