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vm-virtio: block: Add "writeback" control to Request

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When this is set to false the write needs to be followed by a flush on
the underlying disk (leading to a fsync()).

The default behaviour is not changed with this change.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2020-05-20 16:32:18 +01:00 committed by Samuel Ortiz
parent b94d9a30d3
commit 10db2131bd
1 changed files with 10 additions and 6 deletions
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16
vm-virtio/src/block.rs
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@ -479,6 +479,7 @@ pub struct Request {
data_addr: GuestAddress, data_addr: GuestAddress,
data_len: u32, data_len: u32,
pub status_addr: GuestAddress, pub status_addr: GuestAddress,
writeback: bool,
} }
impl Request { impl Request {
@ -497,6 +498,7 @@ impl Request {
data_addr: GuestAddress(0), data_addr: GuestAddress(0),
data_len: 0, data_len: 0,
status_addr: GuestAddress(0), status_addr: GuestAddress(0),
writeback: true,
}; };
let data_desc; let data_desc;
@ -576,13 +578,11 @@ impl Request {
RequestType::Out => { RequestType::Out => {
mem.write_all_to(self.data_addr, disk, self.data_len as usize) mem.write_all_to(self.data_addr, disk, self.data_len as usize)
.map_err(ExecuteError::Write)?; .map_err(ExecuteError::Write)?;
} if !self.writeback {
RequestType::Flush => match disk.flush() { disk.flush().map_err(ExecuteError::Flush)?;
Ok(_) => {
return Ok(0);
} }
Err(e) => return Err(ExecuteError::Flush(e)), }
}, RequestType::Flush => disk.flush().map_err(ExecuteError::Flush)?,
RequestType::GetDeviceID => { RequestType::GetDeviceID => {
if (self.data_len as usize) < disk_id.len() { if (self.data_len as usize) < disk_id.len() {
return Err(ExecuteError::BadRequest(Error::InvalidOffset)); return Err(ExecuteError::BadRequest(Error::InvalidOffset));
@ -594,6 +594,10 @@ impl Request {
}; };
Ok(0) Ok(0)
} }
pub fn set_writeback(&mut self, writeback: bool) {
self.writeback = writeback
}
} }
struct BlockEpollHandler<T: DiskFile> { struct BlockEpollHandler<T: DiskFile> {