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2017-07-24block: Skip implicit nodes in query-block/blockstatsKevin Wolf2-1/+1
Commits 0db832f and 6cdbceb introduced the automatic insertion of filter nodes above the top layer of mirror and commit block jobs. The assumption made there was that since libvirt doesn't do node-level management of the block layer yet, it shouldn't be affected by added nodes. This is true as far as commands issued by libvirt are concerned. It only uses BlockBackend names to address nodes, so any operations it performs still operate on the root of the tree as intended. However, the assumption breaks down when you consider query commands, which return data for the wrong node now. These commands also return information on some child nodes (bs->file and/or bs->backing), which libvirt does make use of, and which refer to the wrong nodes, too. One of the consequences is that oVirt gets wrong information about the image size and stops the VM in response as long as a mirror or commit job is running: https://bugzilla.redhat.com/show_bug.cgi?id=1470634 This patch fixes the problem by hiding the implicit nodes created automatically by the mirror and commit block jobs in the output of query-block and BlockBackend-based query-blockstats as long as the user doesn't indicate that they are aware of those nodes by providing a node name for them in the QMP command to start the block job. The node-based commands query-named-block-nodes and query-blockstats with query-nodes=true still show all nodes, including implicit ones. This ensures that users that are capable of node-level management can still access the full information; users that only know BlockBackends won't use these commands. Cc: qemu-stable@nongnu.org Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Peter Krempa <pkrempa@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Tested-by: Eric Blake <eblake@redhat.com>
2017-07-17block: invoke .bdrv_drain callback in coroutine context and from AioContextPaolo Bonzini1-1/+1
This will let the callback take a CoMutex in the next patch. Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Fam Zheng <famz@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20170629132749.997-8-pbonzini@redhat.com> Signed-off-by: Fam Zheng <famz@redhat.com>
2017-07-14nbd: Implement NBD_INFO_BLOCK_SIZE on clientEric Blake1-0/+6
The upstream NBD Protocol has defined a new extension to allow the server to advertise block sizes to the client, as well as a way for the client to inform the server whether it intends to obey block sizes. When using the block layer as the client, we will obey block sizes; but when used as 'qemu-nbd -c' to hand off to the kernel nbd module as the client, we are still waiting for the kernel to implement a way for us to learn if it will honor block sizes (perhaps by an addition to sysfs, rather than an ioctl), as well as any way to tell the kernel what additional block sizes to obey (NBD_SET_BLKSIZE appears to be accurate for the minimum size, but preferred and maximum sizes would probably be new ioctl()s), so until then, we need to make our request for block sizes conditional. When using ioctl(NBD_SET_BLKSIZE) to hand off to the kernel, use the minimum block size as the sector size if it is larger than 512, which also has the nice effect of cooperating with (non-qemu) servers that don't do read-modify-write when exposing a block device with 4k sectors; it might also allow us to visit a file larger than 2T on a 32-bit kernel. Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <20170707203049.534-10-eblake@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-07-14nbd: Expose and debug more NBD constantsEric Blake1-9/+28
The NBD protocol has several constants defined in various extensions that we are about to implement. Expose them to the code, along with an easy way to map various constants to strings during diagnostic messages. Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <20170707203049.534-4-eblake@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-07-14nbd: Create struct for tracking export infoEric Blake1-4/+11
The NBD Protocol is introducing some additional information about exports, such as minimum request size and alignment, as well as an advertised maximum request size. It will be easier to feed this information back to the block layer if we gather all the information into a struct, rather than adding yet more pointer parameters during negotiation. Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <20170707203049.534-2-eblake@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-07-11block: Add PreallocMode to bdrv_truncate()Max Reitz1-1/+2
For block drivers that just pass a truncate request to the underlying protocol, we can now pass the preallocation mode instead of aborting if it is not PREALLOC_MODE_OFF. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: 20170613202107.10125-3-mreitz@redhat.com Signed-off-by: Max Reitz <mreitz@redhat.com>
2017-07-11block: Add PreallocMode to BD.bdrv_truncate()Max Reitz1-1/+2
Add a PreallocMode parameter to the bdrv_truncate() function implemented by each block driver. Currently, we always pass PREALLOC_MODE_OFF and no driver accepts anything else. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: 20170613202107.10125-2-mreitz@redhat.com Signed-off-by: Max Reitz <mreitz@redhat.com>
2017-07-11block: add bdrv_measure() APIStefan Hajnoczi2-0/+4
bdrv_measure() provides a conservative maximum for the size of a new image. This information is handy if storage needs to be allocated (e.g. a SAN or an LVM volume) ahead of time. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Alberto Garcia <berto@igalia.com> Message-id: 20170705125738.8777-2-stefanha@redhat.com Signed-off-by: Max Reitz <mreitz@redhat.com>
2017-07-11block: release persistent bitmaps on inactivateVladimir Sementsov-Ogievskiy1-0/+1
We should release them here to reload on invalidate cache. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Message-id: 20170628120530.31251-31-vsementsov@virtuozzo.com Signed-off-by: Max Reitz <mreitz@redhat.com>
2017-07-11block/dirty-bitmap: add bdrv_remove_persistent_dirty_bitmapVladimir Sementsov-Ogievskiy2-0/+6
Interface for removing persistent bitmap from its storage. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Reviewed-by: John Snow <jsnow@redhat.com> Message-id: 20170628120530.31251-28-vsementsov@virtuozzo.com Signed-off-by: Max Reitz <mreitz@redhat.com>
2017-07-11qmp: add x-debug-block-dirty-bitmap-sha256Vladimir Sementsov-Ogievskiy1-0/+1
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-id: 20170628120530.31251-26-vsementsov@virtuozzo.com Signed-off-by: Max Reitz <mreitz@redhat.com>
2017-07-11block: add bdrv_can_store_new_dirty_bitmapVladimir Sementsov-Ogievskiy2-0/+7
This will be needed to check some restrictions before making bitmap persistent in qmp-block-dirty-bitmap-add (this functionality will be added by future patch) Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Reviewed-by: John Snow <jsnow@redhat.com> Message-id: 20170628120530.31251-22-vsementsov@virtuozzo.com Signed-off-by: Max Reitz <mreitz@redhat.com>
2017-07-11block/dirty-bitmap: add bdrv_dirty_bitmap_next()Vladimir Sementsov-Ogievskiy1-0/+2
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Reviewed-by: John Snow <jsnow@redhat.com> Message-id: 20170628120530.31251-19-vsementsov@virtuozzo.com Signed-off-by: Max Reitz <mreitz@redhat.com>
2017-07-11block: introduce persistent dirty bitmapsVladimir Sementsov-Ogievskiy1-0/+4
New field BdrvDirtyBitmap.persistent means, that bitmap should be saved by format driver in .bdrv_close and .bdrv_inactivate. No format driver supports it for now. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-id: 20170628120530.31251-18-vsementsov@virtuozzo.com [mreitz: Fixed indentation] Signed-off-by: Max Reitz <mreitz@redhat.com>
2017-07-11block/dirty-bitmap: add autoload field to BdrvDirtyBitmapVladimir Sementsov-Ogievskiy1-0/+2
Mirror AUTO flag from Qcow2 bitmap in BdrvDirtyBitmap. This will be needed in future, to save this flag back to Qcow2 for persistent bitmaps. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-id: 20170628120530.31251-16-vsementsov@virtuozzo.com Signed-off-by: Max Reitz <mreitz@redhat.com>
2017-07-11block: new bdrv_reopen_bitmaps_rw interfaceVladimir Sementsov-Ogievskiy1-0/+7
Add format driver handler, which should mark loaded read-only bitmaps as 'IN_USE' in the image and unset read_only field in corresponding BdrvDirtyBitmap's. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Reviewed-by: John Snow <jsnow@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Message-id: 20170628120530.31251-14-vsementsov@virtuozzo.com Signed-off-by: Max Reitz <mreitz@redhat.com>
2017-07-11block/dirty-bitmap: add readonly field to BdrvDirtyBitmapVladimir Sementsov-Ogievskiy1-0/+4
It will be needed in following commits for persistent bitmaps. If bitmap is loaded from read-only storage (and we can't mark it "in use" in this storage) corresponding BdrvDirtyBitmap should be read-only. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-id: 20170628120530.31251-11-vsementsov@virtuozzo.com Signed-off-by: Max Reitz <mreitz@redhat.com>
2017-07-11block/dirty-bitmap: add deserialize_ones funcVladimir Sementsov-Ogievskiy1-0/+3
Add bdrv_dirty_bitmap_deserialize_ones() function, which is needed for qcow2 bitmap loading, to handle unallocated bitmap parts, marked as all-ones. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: John Snow <jsnow@redhat.com> Message-id: 20170628120530.31251-7-vsementsov@virtuozzo.com Signed-off-by: Max Reitz <mreitz@redhat.com>
2017-07-11block: fix bdrv_dirty_bitmap_granularity signatureVladimir Sementsov-Ogievskiy1-1/+1
Make getter signature const-correct. This allows other functions with const dirty bitmap parameter use bdrv_dirty_bitmap_granularity(). Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: John Snow <jsnow@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Message-id: 20170628120530.31251-6-vsementsov@virtuozzo.com Signed-off-by: Max Reitz <mreitz@redhat.com>
2017-07-11block: remove all encryption handling APIsDaniel P. Berrange2-4/+0
Now that all encryption keys must be provided upfront via the QCryptoSecret API and associated block driver properties there is no need for any explicit encryption handling APIs in the block layer. Encryption can be handled transparently within the block driver. We only retain an API for querying whether an image is encrypted or not, since that is a potentially useful piece of metadata to report to the user. Reviewed-by: Alberto Garcia <berto@igalia.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com> Message-id: 20170623162419.26068-18-berrange@redhat.com Signed-off-by: Max Reitz <mreitz@redhat.com>
2017-07-11block: deprecate "encryption=on" in favor of "encrypt.format=aes"Daniel P. Berrange1-1/+1
Historically the qcow & qcow2 image formats supported a property "encryption=on" to enable their built-in AES encryption. We'll soon be supporting LUKS for qcow2, so need a more general purpose way to enable encryption, with a choice of formats. This introduces an "encrypt.format" option, which will later be joined by a number of other "encrypt.XXX" options. The use of a "encrypt." prefix instead of "encrypt-" is done to facilitate mapping to a nested QAPI schema at later date. e.g. the preferred syntax is now qemu-img create -f qcow2 -o encrypt.format=aes demo.qcow2 Signed-off-by: Daniel P. Berrange <berrange@redhat.com> Message-id: 20170623162419.26068-8-berrange@redhat.com Reviewed-by: Alberto Garcia <berto@igalia.com> Signed-off-by: Max Reitz <mreitz@redhat.com>
2017-07-10block: Make bdrv_is_allocated_above() byte-basedEric Blake1-1/+1
We are gradually moving away from sector-based interfaces, towards byte-based. In the common case, allocation is unlikely to ever use values that are not naturally sector-aligned, but it is possible that byte-based values will let us be more precise about allocation at the end of an unaligned file that can do byte-based access. Changing the signature of the function to use int64_t *pnum ensures that the compiler enforces that all callers are updated. For now, the io.c layer still assert()s that all callers are sector-aligned, but that can be relaxed when a later patch implements byte-based block status. Therefore, for the most part this patch is just the addition of scaling at the callers followed by inverse scaling at bdrv_is_allocated(). But some code, particularly stream_run(), gets a lot simpler because it no longer has to mess with sectors. Leave comments where we can further simplify by switching to byte-based iterations, once later patches eliminate the need for sector-aligned operations. For ease of review, bdrv_is_allocated() was tackled separately. Signed-off-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2017-07-10block: Make bdrv_is_allocated() byte-basedEric Blake1-2/+2
We are gradually moving away from sector-based interfaces, towards byte-based. In the common case, allocation is unlikely to ever use values that are not naturally sector-aligned, but it is possible that byte-based values will let us be more precise about allocation at the end of an unaligned file that can do byte-based access. Changing the signature of the function to use int64_t *pnum ensures that the compiler enforces that all callers are updated. For now, the io.c layer still assert()s that all callers are sector-aligned on input and that *pnum is sector-aligned on return to the caller, but that can be relaxed when a later patch implements byte-based block status. Therefore, this code adds usages like DIV_ROUND_UP(,BDRV_SECTOR_SIZE) to callers that still want aligned values, where the call might reasonbly give non-aligned results in the future; on the other hand, no rounding is needed for callers that should just continue to work with byte alignment. For the most part this patch is just the addition of scaling at the callers followed by inverse scaling at bdrv_is_allocated(). But some code, particularly bdrv_commit(), gets a lot simpler because it no longer has to mess with sectors; also, it is now possible to pass NULL if the caller does not care how much of the image is allocated beyond the initial offset. Leave comments where we can further simplify once a later patch eliminates the need for sector-aligned requests through bdrv_is_allocated(). For ease of review, bdrv_is_allocated_above() will be tackled separately. Signed-off-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2017-07-10backup: Switch block_backup.h to byte-basedEric Blake1-6/+5
We are gradually converting to byte-based interfaces, as they are easier to reason about than sector-based. Continue by converting the public interface to backup jobs (no semantic change), including a change to CowRequest to track by bytes instead of cluster indices. Note that this does not change the difference between the public interface (starting point, and size of the subsequent range) and the internal interface (starting and end points). Signed-off-by: Eric Blake <eblake@redhat.com> Reviewed-by: John Snow <jsnow@redhat.com> Reviewed-by: Xie Changlong <xiechanglong@cmss.chinamobile.com> Reviewed-by: Jeff Cody <jcody@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2017-07-10block: Drop unused bdrv_round_sectors_to_clusters()Eric Blake1-4/+0
Now that the last user [mirror_iteration()] has converted to using bytes, we no longer need a function to round sectors to clusters. Signed-off-by: Eric Blake <eblake@redhat.com> Reviewed-by: John Snow <jsnow@redhat.com> Reviewed-by: Jeff Cody <jcody@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2017-07-10block: Simplify use of BDRV_BLOCK_RAWEric Blake1-3/+3
The lone caller that cares about a return of BDRV_BLOCK_RAW (namely, io.c:bdrv_co_get_block_status) completely replaces the return value, so there is no point in passing BDRV_BLOCK_DATA. Signed-off-by: Eric Blake <eblake@redhat.com> Reviewed-by: Fam Zheng <famz@redhat.com> Reviewed-by: John Snow <jsnow@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2017-06-30block: Add BDRV_BLOCK_EOF to bdrv_get_block_status()Eric Blake1-0/+2
Just as the block layer already sets BDRV_BLOCK_ALLOCATED as a shortcut for subsequent operations, there are also some optimizations that are made easier if we can quickly tell that *pnum will advance us to the end of a file, via a new BDRV_BLOCK_EOF which gets set by the block layer. This just plumbs up the new bit; subsequent patches will make use of it. Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <20170505021500.19315-2-eblake@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Fam Zheng <famz@redhat.com>
2017-06-26fix: avoid an infinite loop or a dangling pointer problem in img_commitsochin.jiang1-0/+18
img_commit could fall into an infinite loop calling run_block_job() if its blockjob fails on any I/O error, fix this already known problem. Signed-off-by: sochin.jiang <sochin.jiang@huawei.com> Message-id: 1497509253-28941-1-git-send-email-sochin.jiang@huawei.com Signed-off-by: Max Reitz <mreitz@redhat.com>
2017-06-26block: change variable names in BlockDriverStateManos Pitsidianakis2-7/+7
Change the 'int count' parameter in *pwrite_zeros, *pdiscard related functions (and some others) to 'int bytes', as they both refer to bytes. This helps with code legibility. Signed-off-by: Manos Pitsidianakis <el13635@mail.ntua.gr> Message-id: 20170609101808.13506-1-el13635@mail.ntua.gr Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Max Reitz <mreitz@redhat.com>
2017-06-26block: Remove bdrv_aio_readv/writev/flush()Kevin Wolf1-8/+0
These functions are unused now. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
2017-06-20Merge remote-tracking branch ↵Peter Maydell4-33/+69
'remotes/famz/tags/docker-and-block-pull-request' into staging # gpg: Signature made Fri 16 Jun 2017 01:18:46 BST # gpg: using RSA key 0xCA35624C6A9171C6 # gpg: Good signature from "Fam Zheng <famz@redhat.com>" # gpg: WARNING: This key is not certified with sufficiently trusted signatures! # gpg: It is not certain that the signature belongs to the owner. # Primary key fingerprint: 5003 7CB7 9706 0F76 F021 AD56 CA35 624C 6A91 71C6 * remotes/famz/tags/docker-and-block-pull-request: (23 commits) block: make accounting thread-safe block: split BlockAcctStats creation and setup block: introduce block_account_one_io block: protect modification of dirty bitmaps with a mutex migration/block: reset dirty bitmap before reading block: introduce dirty_bitmap_mutex block: protect tracked_requests and flush_queue with reqs_lock block: access write_gen with atomics block: use Stat64 for wr_highest_offset util: add stats64 module throttle-groups: protect throttled requests with a CoMutex throttle-groups: do not use qemu_co_enter_next throttle-groups: only start one coroutine from drained_begin block: access io_plugged with atomic ops block: access wakeup with atomic ops block: access serialising_in_flight with atomic ops block: access io_limits_disabled with atomic ops block: access quiesce_counter with atomic ops block: access copy_on_read with atomic ops docker: Add flex and bison to centos6 image ... Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2017-06-16block: make accounting thread-safePaolo Bonzini1-2/+6
I'm not trying too hard yet. Later, with multiqueue support, this may cause mutex contention or cacheline bouncing. Cc: Alberto Garcia <berto@igalia.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20170605123908.18777-20-pbonzini@redhat.com> Reviewed-by: Alberto Garcia <berto@igalia.com> Signed-off-by: Fam Zheng <famz@redhat.com>
2017-06-16block: split BlockAcctStats creation and setupPaolo Bonzini1-1/+2
block_acct_destroy is called unconditionally in blk_delete, but there is no BlockAcctStats function that is called unconditionally in blk_new. Split block_acct_init in two, so that it will be possible to create a QemuMutex in block_acct_init and destroy it in block_acct_cleanup. Cc: Alberto Garcia <berto@igalia.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20170605123908.18777-19-pbonzini@redhat.com> Reviewed-by: Alberto Garcia <berto@igalia.com> Signed-off-by: Fam Zheng <famz@redhat.com>
2017-06-16block: protect modification of dirty bitmaps with a mutexPaolo Bonzini2-9/+20
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20170605123908.18777-17-pbonzini@redhat.com> Signed-off-by: Fam Zheng <famz@redhat.com>
2017-06-16block: introduce dirty_bitmap_mutexPaolo Bonzini1-0/+5
It protects only the list of dirty bitmaps; in the next patch we will also protect their content. Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20170605123908.18777-15-pbonzini@redhat.com> Signed-off-by: Fam Zheng <famz@redhat.com>
2017-06-16block: protect tracked_requests and flush_queue with reqs_lockPaolo Bonzini1-5/+9
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20170605123908.18777-14-pbonzini@redhat.com> Signed-off-by: Fam Zheng <famz@redhat.com>
2017-06-16block: access write_gen with atomicsPaolo Bonzini1-1/+1
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20170605123908.18777-13-pbonzini@redhat.com> Signed-off-by: Fam Zheng <famz@redhat.com>
2017-06-16block: use Stat64 for wr_highest_offsetPaolo Bonzini1-3/+4
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20170605123908.18777-12-pbonzini@redhat.com> Signed-off-by: Fam Zheng <famz@redhat.com>
2017-06-16block: access io_plugged with atomic opsPaolo Bonzini1-3/+5
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20170605123908.18777-7-pbonzini@redhat.com> Signed-off-by: Fam Zheng <famz@redhat.com>
2017-06-16block: access wakeup with atomic opsPaolo Bonzini2-4/+8
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20170605123908.18777-6-pbonzini@redhat.com> Signed-off-by: Fam Zheng <famz@redhat.com>
2017-06-16block: access serialising_in_flight with atomic opsPaolo Bonzini1-4/+6
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20170605123908.18777-5-pbonzini@redhat.com> Signed-off-by: Fam Zheng <famz@redhat.com>
2017-06-16block: access quiesce_counter with atomic opsPaolo Bonzini1-0/+1
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Alberto Garcia <berto@igalia.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20170605123908.18777-3-pbonzini@redhat.com> Signed-off-by: Fam Zheng <famz@redhat.com>
2017-06-16block: access copy_on_read with atomic opsPaolo Bonzini1-5/+6
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20170605123908.18777-2-pbonzini@redhat.com> Signed-off-by: Fam Zheng <famz@redhat.com>
2017-06-15nbd: rename read_sync and friendsVladimir Sementsov-Ogievskiy1-6/+2
Rename nbd_wr_syncv -> nbd_rwv read_sync -> nbd_read read_sync_eof -> nbd_read_eof write_sync -> nbd_write drop_sync -> nbd_drop 1. nbd_ prefix read_sync and write_sync are already shared, so it is good to have a namespace prefix. drop_sync will be shared, and read_sync_eof is related to read_sync, so let's rename them all. 2. _sync suffix _sync is related to the fact that nbd_wr_syncv doesn't return if a write to socket returns EAGAIN. The first implementation of nbd_wr_syncv (was wr_sync in 7a5ca8648b) just loops while getting EAGAIN, the current implementation yields in this case. Why we want to get rid of it: - it is normal for r/w functions to be synchronous, so having an additional suffix for it looks redundant (contrariwise, we have _aio suffix for async functions) - _sync suffix in block layer is used when function does flush (so using it for other thing is confusing a bit) - keep function names short after adding nbd_ prefix 3. for nbd_wr_syncv let's use more common notation 'rw' Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-Id: <20170602150150.258222-2-vsementsov@virtuozzo.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-06-15nbd: Fix regression on resiliency to port scanEric Blake1-1/+1
Back in qemu 2.5, qemu-nbd was immune to port probes (a transient server would not quit, regardless of how many probe connections came and went, until a connection actually negotiated). But we broke that in commit ee7d7aa when removing the return value to nbd_client_new(), although that patch also introduced a bug causing an assertion failure on a client that fails negotiation. We then made it worse during refactoring in commit 1a6245a (a segfault before we could even assert); the (masked) assertion was cleaned up in d3780c2 (still in 2.6), and just recently we finally fixed the segfault ("nbd: Fully intialize client in case of failed negotiation"). But that still means that ever since we added TLS support to qemu-nbd, we have been vulnerable to an ill-timed port-scan being able to cause a denial of service by taking down qemu-nbd before a real client has a chance to connect. Since negotiation is now handled asynchronously via coroutines, we no longer have a synchronous point of return by re-adding a return value to nbd_client_new(). So this patch instead wires things up to pass the negotiation status through the close_fn callback function. Simple test across two terminals: $ qemu-nbd -f raw -p 30001 file $ nmap 127.0.0.1 -p 30001 && \ qemu-io -c 'r 0 512' -f raw nbd://localhost:30001 Note that this patch does not change what constitutes successful negotiation (thus, a client must enter transmission phase before that client can be considered as a reason to terminate the server when the connection ends). Perhaps we may want to tweak things in a later patch to also treat a client that uses NBD_OPT_ABORT as being a 'successful' negotiation (the client correctly talked the NBD protocol, and informed us it was not going to use our export after all), but that's a discussion for another day. Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1451614 Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <20170608222617.20376-1-eblake@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-06-06nbd/client.c: use errp instead of LOGVladimir Sementsov-Ogievskiy1-2/+3
Move to modern errp scheme from just LOGging errors. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-Id: <20170526110913.89098-1-vsementsov@virtuozzo.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-06-06nbd: add errp parameter to nbd_wr_syncv()Vladimir Sementsov-Ogievskiy1-1/+2
Will be used in following patch to provide actual error message in some cases. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-Id: <20170516094533.6160-4-vsementsov@virtuozzo.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-06-01migration: Create include for migration snapshotsJuan Quintela1-2/+2
Start removing migration code from sysemu/sysemu.h. Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2017-05-30Merge remote-tracking branch 'kwolf/tags/for-upstream' into stagingStefan Hajnoczi1-0/+3
Block layer patches # gpg: Signature made Mon 29 May 2017 03:34:59 PM BST # gpg: using RSA key 0x7F09B272C88F2FD6 # gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>" # Primary key fingerprint: DC3D EB15 9A9A F95D 3D74 56FE 7F09 B272 C88F 2FD6 * kwolf/tags/for-upstream: block/file-*: *_parse_filename() and colons block: Fix backing paths for filenames with colons block: Tweak error message related to qemu-img amend qemu-img: Fix leakage of options on error qemu-img: copy *key-secret opts when opening newly created files qemu-img: introduce --target-image-opts for 'convert' command qemu-img: fix --image-opts usage with dd command qemu-img: add support for --object with 'dd' command qemu-img: Fix documentation of convert qcow2: remove extra local_error variable mirror: Drop permissions on s->target on completion nvme: Add support for Controller Memory Buffers iotests: 147: Don't test inet6 if not available qemu-iotests: Test streaming with missing job ID stream: fix crash in stream_start() when block_job_create() fails Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2017-05-29block/file-*: *_parse_filename() and colonsMax Reitz1-0/+3
The file drivers' *_parse_filename() implementations just strip the optional protocol prefix off the filename. However, for e.g. "file:foo:bar", this would lead to "foo:bar" being stored as the BDS's filename which looks like it should be managed using the "foo" protocol. This is especially troublesome if you then try to resolve a backing filename based on "foo:bar". This issue can only occur if the stripped part is a relative filename ("file:/foo:bar" will be shortened to "/foo:bar" and having a slash before the first colon means that "/foo" is not recognized as a protocol part). Therefore, we can easily fix it by prepending "./" to such filenames. Before this patch: $ ./qemu-img create -f qcow2 backing.qcow2 64M Formatting 'backing.qcow2', fmt=qcow2 size=67108864 encryption=off cluster_size=65536 lazy_refcounts=off refcount_bits=16 $ ./qemu-img create -f qcow2 -b backing.qcow2 file:top:image.qcow2 Formatting 'file:top:image.qcow2', fmt=qcow2 size=67108864 backing_file=backing.qcow2 encryption=off cluster_size=65536 lazy_refcounts=off refcount_bits=16 $ ./qemu-io file:top:image.qcow2 can't open device file:top:image.qcow2: Could not open backing file: Unknown protocol 'top' After this patch: $ ./qemu-io file:top:image.qcow2 [no error] Signed-off-by: Max Reitz <mreitz@redhat.com> Message-id: 20170522195217.12991-3-mreitz@redhat.com Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Max Reitz <mreitz@redhat.com>
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