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* block: Rename BlockDriverCompletionFunc to BlockCompletionFuncMarkus Armbruster2014-10-201-5/+5
| | | | | | | | | | I'll use it with block backends shortly, and the name is going to fit badly there. It's a block layer thing anyway, not just a block driver thing. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
* qed: use BlockDriverState's AioContextStefan Hajnoczi2014-06-041-4/+4
| | | | | | | | | | | Drop the assumption that we're using the main AioContext. Convert qemu_bh_new() to aio_bh_new() and qemu_aio_wait() to aio_poll() so we're using the BlockDriverState's AioContext. Implement .bdrv_detach/attach_aio_context() interfaces to move the QED_F_NEED_CHECK timer from the old AioContext to the new one. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* misc: move include files to include/qemu/Paolo Bonzini2012-12-191-1/+1
| | | | Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* cleanup useless return sentenceAmos Kong2012-10-051-1/+0
| | | | | | | | This patch cleans up return sentences in the end of void functions. Reported-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Amos Kong <akong@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@gmail.com>
* block: bdrv_aio_* do not return NULLPaolo Bonzini2011-12-151-15/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Initially done with the following semantic patch: @ rule1 @ expression E; statement S; @@ E = ( bdrv_aio_readv | bdrv_aio_writev | bdrv_aio_flush | bdrv_aio_discard | bdrv_aio_ioctl ) (...); ( - if (E == NULL) { ... } | - if (E) { <... S ...> } ) which however missed the occurrence in block/blkverify.c (as it should have done), and left behind some unused variables. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
* qed: adjust the way to get nb_sectorsZhi Yong Wu2011-12-051-3/+3
| | | | | | | | | | | | | | | This patch is only to refactor some lines of codes to get better and more robust codes. As you have seen, in qed_read_table_cb() it's nice to use qiov->size because that function doesn't obviously use a single struct iovec. In other two functions, if qiov use more than one struct iovec, the existing way will get wrong nb_sectors. To make the code more robust, it will be nicer to refactor the existing way as below. Signed-off-by: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com> Acked-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
* qed: fix use-after-free during l2 cache commitStefan Hajnoczi2011-10-051-3/+3
| | | | | | | | | | | | | | | | | QED's metadata caching strategy allows two parallel requests to race for metadata lookup. The first one to complete will populate the metadata cache and the second one will drop the data it just read in favor of the cached data. There is a use-after-free in qed_read_l2_table_cb() and qed_commit_l2_update() where l2_table->offset was used after the l2_table may have been freed due to a metadata lookup race. Fix this by keeping the l2_offset in a local variable and not reaching into the possibly freed l2_table. Reported-by: Amit Shah <amit.shah@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
* async: Remove AsyncContextKevin Wolf2011-08-021-14/+0
| | | | | | | | | | | The purpose of AsyncContexts was to protect qcow and qcow2 against reentrancy during an emulated bdrv_read/write (which includes a qemu_aio_wait() call and can run AIO callbacks of different requests if it weren't for AsyncContexts). Now both qcow and qcow2 are protected by CoMutexes and AsyncContexts can be removed. Signed-off-by: Kevin Wolf <kwolf@redhat.com>
* qed: Table, L2 cache, and cluster functionsStefan Hajnoczi2010-12-171-0/+319
This patch adds code to look up data cluster offsets in the image via the L1/L2 tables. The L2 tables are writethrough cached in memory for performance (each read/write requires a lookup so it is essential to cache the tables). With cluster lookup code in place it is possible to implement bdrv_is_allocated() to query the number of contiguous allocated/unallocated clusters. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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