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2014-09-22async: aio_context_new(): Handle event_notifier_init failureChrysostomos Nanakos
On a system with a low limit of open files the initialization of the event notifier could fail and QEMU exits without printing any error information to the user. The problem can be easily reproduced by enforcing a low limit of open files and start QEMU with enough I/O threads to hit this limit. The same problem raises, without the creation of I/O threads, while QEMU initializes the main event loop by enforcing an even lower limit of open files. This commit adds an error message on failure: # qemu [...] -object iothread,id=iothread0 -object iothread,id=iothread1 qemu: Failed to initialize event notifier: Too many open files in system Signed-off-by: Chrysostomos Nanakos <cnanakos@grnet.gr> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-09-10qemu-io: Clean up openfile() after commit 2e40134Markus Armbruster
Commit 6db9560 split off the growable case so it can use bdrv_file_open() instead of bdrv_open() then. Growable BDSes become anonymous. Weird. Commit 2e40134 folded bdrv_file_open() back into bdrv_open() with new flag BDRV_O_PROTOCOL. We still have two bdrv_open() calls, and growable BDSes remain anonymous. Circle back to before commit 6db9560: just one call, not anonymous. Signed-off-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-08-20block: Use g_new() & friends where that makes obvious senseMarkus Armbruster
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>
2014-06-09trace: Multi-backend tracingLluís Vilanova
Adds support to compile QEMU with multiple tracing backends at the same time. For example, you can compile QEMU with: $ ./configure --enable-trace-backends=ftrace,dtrace Where 'ftrace' can be handy for having an in-flight record of events, and 'dtrace' can be later used to extract more information from the system. This patch allows having both available without recompiling QEMU. Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-05-30qemu-io: Don't print NULL when open without non-option arg failsMarkus Armbruster
Reproducer: "open -o a=b". Broken in commit fd0fee3. Signed-off-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-05-30qemu-io: Plug memory leak in open commandMarkus Armbruster
Introduced in commit b543c5c. Spotted by Coverity. Signed-off-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-05-30qemu-io: Support multiple -o in open commandMarkus Armbruster
Instead of ignoring all option values but the last one, multiple -o options now have the same meaning as having a single option with all settings in the order of their respective -o options. Same as commit 2dc8328 for qemu-img convert, except here we do it with QemuOpts rather than QEMUOptionParameter. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Benoit Canet <benoit@irqsave.net> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-04-22block: Add errp to bdrv_new()Kevin Wolf
This patch adds an errp parameter to bdrv_new() and updates all its callers. The next patches will make use of this in order to check for duplicate IDs. Most of the callers know that their ID is fine, so they can simply assert that there is no error. Behaviour doesn't change with this patch yet as bdrv_new() doesn't actually assign errors to errp. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
2014-03-19qemu-io: Extended "--cmd" description in usage textMaria Kustova
It's not clear from the usage description that "--cmd" option accepts its argument as a string, so any special symbols have to be quoted from the shell. Updates in usage text: - Specified parameter format for "--cmd" option. - Added an instruction how to get help for "--cmd" option. Signed-off-by: Maria Kustova <maria.k@catit.be> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-03-13qemu-io: Fix warnings from static code analysisStefan Weil
Smatch complains about several global symbols which should be local. Add the missing 'static' attributes and move the 'extern' declaration of variable qemuio_misalign to qemu-io.h. This variable also changes the type from 'int' to 'bool' which better fits documents its use. Signed-off-by: Stefan Weil <sw@weilnetz.de> Acked-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-02-25Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into stagingPeter Maydell
Block patches # gpg: Signature made Fri 21 Feb 2014 21:42:24 GMT using RSA key ID C88F2FD6 # gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>" * remotes/kevin/tags/for-upstream: (54 commits) iotests: Mixed quorum child device specifications quorum: Simplify quorum_open() quorum: Add unit test. quorum: Add quorum_open() and quorum_close(). quorum: Implement recursive .bdrv_recurse_is_first_non_filter in quorum. quorum: Add quorum_co_flush(). quorum: Add quorum_invalidate_cache(). quorum: Add quorum_getlength(). quorum: Add quorum mechanism. quorum: Add quorum_aio_readv. blkverify: Extract qemu_iovec_clone() and qemu_iovec_compare() from blkverify. quorum: Add quorum_aio_writev and its dependencies. quorum: Create BDRVQuorumState and BlkDriver and do init. quorum: Create quorum.c, add QuorumChildRequest and QuorumAIOCB. check-qdict: Test termination of qdict_array_split() check-qdict: Adjust test for qdict_array_split() qdict: Extract non-QDicts in qdict_array_split() qemu-config: Sections must consist of keys qemu-iotests: Check qemu-img command line parsing qemu-img: Allow -o help with incomplete argument list ... Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2014-02-21block: Make bdrv_file_open() staticMax Reitz
Add the bdrv_open() option BDRV_O_PROTOCOL which results in passing the call to bdrv_file_open(). Additionally, make bdrv_file_open() static and therefore bdrv_open() the only way to call it. Consequently, all existing calls to bdrv_file_open() have to be adjusted to use bdrv_open() with the BDRV_O_PROTOCOL flag instead. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Benoit Canet <benoit@irqsave.net> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-02-21block: Add reference parameter to bdrv_open()Max Reitz
Allow bdrv_open() to handle references to existing block devices just as bdrv_file_open() is already capable of. Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-02-21block: Change BDS parameter of bdrv_open() to **Max Reitz
Make bdrv_open() take a pointer to a BDS pointer, similarly to bdrv_file_open(). If a pointer to a NULL pointer is given, bdrv_open() will create a new BDS with an empty name; if the BDS pointer is not NULL, that existing BDS will be reused (in the same way as bdrv_open() already did). Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-02-20util: Split out exec_dir from os_find_datadirFam Zheng
With this change, main() calls qemu_init_exec_dir and uses argv[0] to init exec_dir. The saved value can be retrieved with qemu_get_exec_dir later. It will be reused by module loading. Signed-off-by: Fam Zheng <famz@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-02-01readline: Add missing GCC_FMT_ATTRStefan Weil
This fixes a compiler warning with -Werror=missing-format-attribute and allows improved compiler checks for variable argument lists. Signed-off-by: Stefan Weil <sw@weilnetz.de> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
2014-01-22qemu-io: Make filename optionalMax Reitz
Giving a filename is actually not essential, since it can be specified through the options as well - on the contrary: Sometimes a filename must not be given. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-22block: Allow reference for bdrv_file_open()Max Reitz
Allow specifying a reference to an existing block device (by name) for bdrv_file_open() instead of a filename and/or options. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-22qemu-io: add command completionStefan Hajnoczi
Autocomplete qemu-io commands at the interactive prompt. Note this only completes command names and not their options. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-01-22qemu-io: use readline.cStefan Hajnoczi
Use readline.c for command-line history. There was support for GNU Readline and BSD Editline but it was never compiled in. Since QEMU has its own readline.c, just use that when qemu-io runs with stdin attached to a terminal. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2013-10-11qemu-io: Let "open" pass options to block driverMax Reitz
Add an option to the open command to specify runtime options for the block driver used. Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2013-09-12block: Error parameter for open functionsMax Reitz
Add an Error ** parameter to bdrv_open, bdrv_file_open and associated functions to allow more specific error messages. Signed-off-by: Max Reitz <mreitz@redhat.com>
2013-09-06block: make bdrv_delete() staticFam Zheng
Manage BlockDriverState lifecycle with refcnt, so bdrv_delete() is no longer public and should be called by bdrv_unref() if refcnt is decreased to 0. This is an identical change because effectively, there's no multiple reference of BDS now: no caller of bdrv_ref() yet, only bdrv_new() sets bs->refcnt to 1, so all bdrv_unref() now actually delete the BDS. Signed-off-by: Fam Zheng <famz@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-08-06ignore SIGPIPE in qemu-img and qemu-ioMORITA Kazutaka
This prevents the tools from being stopped when they write data to a closed connection in the other side. Signed-off-by: MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2013-06-06qemu-io: Use the qemu version for -VKevin Wolf
Always printing 0.0.1 and never updating the version number wasn't very useful. qemu-io is released with qemu, so using the same version number makes most sense. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-06-06qemu-io: Interface cleanupKevin Wolf
Signed-off-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-06-06qemu-io: Move command_loop() and friendsKevin Wolf
Signed-off-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-06-06qemu-io: Move functions for registering and running commandsKevin Wolf
Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-06-06qemu-io: Move 'quit' functionKevin Wolf
This one only makes sense in the context of the qemu-io tool, so move it to qemu-io.c. Adapt coding style and register it like other commands. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-06-06qemu-io: Split off commands to qemu-io-cmds.cKevin Wolf
This is the implementation of all qemu-io commands that make sense to be called from the qemu monitor, i.e. everything except open, close and quit. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-06-06qemu-io: Don't use global bs in command implementationsKevin Wolf
Pass in the BlockDriverState to the command handlers instead of using the global variable. This is an important step to make the commands usable outside of qemu-io. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-06-06qemu-io: Handle cvtnum() errors in 'alloc'Kevin Wolf
Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-06-06qemu-io: Make cvtnum() a wrapper around strtosz_suffix()Kevin Wolf
No reason to implement the same thing multiple times. A nice side effect is that fractional numbers like 0.5M can be used in qemu-io now. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-06-06qemu-io: Remove unused args_commandKevin Wolf
The original intention seems to be something with handling multiple images at once, but this has never been implemented and the only function ever registered is implemented to make everything behave like a "global" command. Just do that unconditionally now. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-05-24qemu-io: Fix 'map' outputKevin Wolf
The output of the 'map' command in qemu-io used to directly resemble bdrv_is_allocated() and could contain many lines for small chunks that all have the same allocation status. After this patch, they will be coalesced into a single output line for a large chunk. As a side effect, the command gains some error handling. Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2013-03-22block: Add options QDict to bdrv_file_open() prototypesKevin Wolf
The new parameter is unused yet. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
2013-03-15block: Add options QDict to bdrv_open() prototypeKevin Wolf
It doesn't do anything yet except storing the options QDict in the BlockDriverState. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-02-22block: implement BDRV_O_UNMAPPaolo Bonzini
It is better to present homogeneous hardware independent of the storage technology that is chosen on the host, hence we make discard a host parameter; the user can choose whether to pass it down to the image format and protocol, or to ignore it. Using DISCARD with filesystems can cause very severe fragmentation, so it is left default-off for now. This can change later when we implement the "anchor" operation for efficient management of preallocated files. There is still one choice to make: whether DISCARD has an effect on the dirty bitmap or not. I chose yes, though there is a disadvantage: if the guest is buggy and issues discards for data that is in use, there will be no way to migrate storage for that guest without downgrading the machine type to an older one. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-12-19misc: move include files to include/qemu/Paolo Bonzini
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-12-19block: move include files to include/block/Paolo Bonzini
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-12-12qemu-io: Add AIO debugging commandsKevin Wolf
This makes the blkdebug suspend/resume functionality available in qemu-io. Use it like this: $ ./qemu-io blkdebug::/tmp/test.qcow2 qemu-io> break write_aio req_a qemu-io> aio_write 0 4k qemu-io> blkdebug: Suspended request 'req_a' qemu-io> resume req_a blkdebug: Resuming request 'req_a' qemu-io> wrote 4096/4096 bytes at offset 0 4 KiB, 1 ops; 0:00:30.71 (133.359788 bytes/sec and 0.0326 ops/sec) Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-12-11qemu-io: Implement write -c for compressed clustersKevin Wolf
This makes it easier to create images with both compressed and uncompressed clusters for testing. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2012-11-14qemu-io: Use bdrv_drain_all instead of qemu_aio_flushKevin Wolf
This is harmless as of today because I/O throttling is not used in qemu-io, however as soon as .bdrv_drain handlers will be introduced, qemu-io must be sure to call bdrv_drain_all(). Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-11-06tools: initialize main loop before block layerPaolo Bonzini
Tools were broken because they initialized the block layer while qemu_aio_context was still NULL. Reported-by: malc <av1474@comtv.ru> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: malc <av1474@comtv.ru>
2012-08-06qemu-io: add "abort" command to simulate program crashStefan Hajnoczi
Avoiding data loss and corruption is the top requirement for image file formats. The qemu-io "abort" command makes it possible to simulate program crashes and does not give the image format a chance to cleanly shut down. This command is useful for data integrity test cases. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-07-17qemu-io: Fix memory leaksKevin Wolf
Almost all callers of create_iovec() forgot to destroy the qiov when the request has completed. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
2012-05-10qemu-io: fix the alloc commandPaolo Bonzini
Because sector_num is not updated, the loop would either go on forever or return garbage. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-04-19qemu-io: use main_loop_waitPaolo Bonzini
This will let timers run during aio_read and aio_write commands, though not during synchronous commands. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-04-19qemu-io: Add command line switch for cache modeKevin Wolf
To be used as in 'qemu-io -t writeback test.img' Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
2012-04-05qemu-io: add option to enable tracingStefan Hajnoczi
It can be useful to enable QEMU tracing when trying out block layer interfaces via qemu-io. Tracing can be enabled using the new -T FILE option where the given file contains a list of trace events to enable (just like the qemu --trace events=FILE option). $ echo qemu_vfree >my-events $ ./qemu-io -T my-events ... Remember to use ./configure --enable-trace-backend=BACKEND when building qemu-io. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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