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path: root/include/sysemu/block-backend-global-state.h (follow)
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* block: Mark bdrv_first_blk() and bdrv_is_root_node() GRAPH_RDLOCKKevin Wolf2023-10-121-2/+2
| | | | | | | | | | | | This adds GRAPH_RDLOCK annotations to declare that callers of bdrv_first_blk() and bdrv_is_root_node() need to hold a reader lock for the graph. These functions are the only functions in block-backend.c that access the parent list of a node. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Message-ID: <20230929145157.45443-5-kwolf@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
* block: Mark bdrv_parent_perms_conflict() and callers GRAPH_RDLOCKKevin Wolf2023-09-201-2/+2
| | | | | | | | | | The function reads the parents list, so it needs to hold the graph lock. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Emanuele Giuseppe Esposito <eesposit@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-ID: <20230911094620.45040-14-kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
* block: add blk_in_drain() APIStefan Hajnoczi2023-05-301-0/+1
| | | | | | | | | | | | | The BlockBackend quiesce_counter is greater than zero during drained sections. Add an API to check whether the BlockBackend is in a drained section. The next patch will use this API. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Message-Id: <20230516190238.8401-10-stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
* block: bdrv/blk_co_unref() for calls in coroutine contextKevin Wolf2023-05-101-1/+4
| | | | | | | | | | | | These functions must not be called in coroutine context, because they need write access to the graph. Cc: qemu-stable@nongnu.org Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-Id: <20230504115750.54437-4-kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
* block: Create no_co_wrappers for open functionsKevin Wolf2023-02-171-4/+17
| | | | | | | | | | | | | | Images can't be opened in coroutine context because opening needs to change the block graph. Add no_co_wrappers so that coroutines have a simple way of opening images in a BH instead. At the same time, mark the wrapped functions as no_coroutine_fn. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Message-Id: <20230126172432.436111-3-kwolf@redhat.com> Reviewed-by: Emanuele Giuseppe Esposito <eesposit@redhat.com> Reviewed-by: Hanna Czenczek <hreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
* block: return errors from bdrv_register_buf()Stefan Hajnoczi2022-10-261-1/+1
| | | | | | | | | | | | | Registering an I/O buffer is only a performance optimization hint but it is still necessary to return errors when it fails. Later patches will need to detect errors when registering buffers but an immediate advantage is that error_report() calls are no longer needed in block driver .bdrv_register_buf() functions. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: 20221013185908.1297568-8-stefanha@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* block: pass size to bdrv_unregister_buf()Stefan Hajnoczi2022-10-261-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | The only implementor of bdrv_register_buf() is block/nvme.c, where the size is not needed when unregistering a buffer. This is because util/vfio-helpers.c can look up mappings by address. Future block drivers that implement bdrv_register_buf() may not be able to do their job given only the buffer address. Add a size argument to bdrv_unregister_buf(). Also document the assumptions about bdrv_register_buf()/bdrv_unregister_buf() calls. The same <host, size> values that were given to bdrv_register_buf() must be given to bdrv_unregister_buf(). gcc 11.2.1 emits a spurious warning that img_bench()'s buf_size local variable might be uninitialized, so it's necessary to silence the compiler. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Stefano Garzarella <sgarzare@redhat.com> Message-id: 20221013185908.1297568-5-stefanha@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* Clean up header guards that don't match their file nameMarkus Armbruster2022-05-111-3/+3
| | | | | | | | | | | | | Header guard symbols should match their file name to make guard collisions less likely. Cleaned up with scripts/clean-header-guards.pl, followed by some renaming of new guard symbols picked by the script to better ones. Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20220506134911.2856099-2-armbru@redhat.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> [Change to generated file ebpf/rss.bpf.skeleton.h backed out]
* include/sysemu/block-backend: split header into I/O and global state (GS) APIEmanuele Giuseppe Esposito2022-03-041-0/+116
Similarly to the previous patches, split block-backend.h in block-backend-io.h and block-backend-global-state.h In addition, remove "block/block.h" include as it seems it is not necessary anymore, together with "qemu/iov.h" block-backend-common.h contains the structures shared between the two headers, and the functions that can't be categorized as I/O or global state. Assertions are added in the next patch. Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com> Message-Id: <20220303151616.325444-8-eesposit@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>