On Mon, Aug 17, 2020 at 12:15:48PM +0300, Vladimir Sementsov-Ogievskiy wrote: > diff --git a/docs/system/qemu-block-drivers.rst.inc > b/docs/system/qemu-block-drivers.rst.inc > index b052a6d14e..5bfa4f4116 100644 > --- a/docs/system/qemu-block-drivers.rst.inc > +++ b/docs/system/qemu-block-drivers.rst.inc > @@ -952,3 +952,29 @@ on host and see if there are locks held by the QEMU > process on the image file. > More than one byte could be locked by the QEMU instance, each byte of which > reflects a particular permission that is acquired or protected by the running > block driver. > + > +Filter drivers > +~~~~~~~~~~~~~~ > + > +Qemu supports several filter drivers, which doesn't store any data, but do > some
s/Qemu/QEMU/
s/doesn't/don't/
> +typedef struct BDRVPreallocateState {
> + int64_t prealloc_size;
> + int64_t prealloc_align;
> +
> + /*
> + * Filter is started as not-active, so it doesn't do any preallocations
> nor
> + * requires BLK_PERM_RESIZE on its child. This is needed to create filter
> + * above another node-child and than do bdrv_replace_node to insert the
s/than/then/
> + * filter.
> + *
> + * Filter becomes active the first time it detect that its parents has
s/detect/detects/
s/has/have/
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