diff options
| author | Paolo Bonzini <pbonzini@redhat.com> | 2013-02-08 14:06:12 +0100 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2013-02-22 21:29:42 +0100 |
| commit | a9384aff5315e7568b6ebc171f4a482e01f06526 (patch) | |
| tree | 6482bec7ed74afb86b53be6e563fe450dd4c252b /qemu-options.hx | |
| parent | 9e8f1835ea3ab3be83634f34c1bb8b69cd871766 (diff) | |
blockdev: add discard suboption to -drive
Add support for BDRV_O_UNMAP from the QEMU command-line.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'qemu-options.hx')
| -rw-r--r-- | qemu-options.hx | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/qemu-options.hx b/qemu-options.hx index 2832d82148..51ff726490 100644 --- a/qemu-options.hx +++ b/qemu-options.hx @@ -440,6 +440,8 @@ These options have the same definition as they have in @option{-hdachs}. @var{cache} is "none", "writeback", "unsafe", "directsync" or "writethrough" and controls how the host cache is used to access block data. @item aio=@var{aio} @var{aio} is "threads", or "native" and selects between pthread based disk I/O and native Linux AIO. +@item discard=@var{discard} +@var{discard} is one of "ignore" (or "off") or "unmap" (or "on") and controls whether @dfn{discard} (also known as @dfn{trim} or @dfn{unmap}) requests are ignored or passed to the filesystem. Some machine types may not support discard requests. @item format=@var{format} Specify which disk @var{format} will be used rather than detecting the format. Can be used to specifiy format=raw to avoid interpreting |