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vmm: Refactor creation of the FileOffset for GuestRegionMmap::new()

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Create this earlier so that it is possible to pass a None in for
anonymous mappings.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2022-10-30 10:07:28 +00:00
parent 86c19816c6
commit ff3fb91ba6
1 changed files with 13 additions and 12 deletions
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25
vmm/src/memory_manager.rs
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@ -1222,7 +1222,7 @@ impl MemoryManager {
size: usize,
hugepages: bool,
hugepage_size: Option<u64>,
) -> Result<(File, u64), Error> {
) -> Result<FileOffset, Error> {
let (f, f_off) = match backing_file {
Some(ref file) => {
if file.is_dir() {
@ -1284,7 +1284,7 @@ impl MemoryManager {
}
};
Ok((f, f_off))
Ok(FileOffset::new(f, f_off))
}
#[allow(clippy::too_many_arguments)]
@ -1300,10 +1300,16 @@ impl MemoryManager {
host_numa_node: Option<u32>,
existing_memory_file: Option<File>,
) -> Result<Arc<GuestRegionMmap>, Error> {
let (f, f_off) = if let Some(f) = existing_memory_file {
(f, file_offset)
let fo = if let Some(f) = existing_memory_file {
Some(FileOffset::new(f, file_offset))
} else {
Self::open_memory_file(backing_file, file_offset, size, hugepages, hugepage_size)?
Some(Self::open_memory_file(
backing_file,
file_offset,
size,
hugepages,
hugepage_size,
)?)
};
let mut mmap_flags = libc::MAP_NORESERVE
@ -1317,13 +1323,8 @@ impl MemoryManager {
}
let region = GuestRegionMmap::new(
MmapRegion::build(
Some(FileOffset::new(f, f_off)),
size,
libc::PROT_READ | libc::PROT_WRITE,
mmap_flags,
)
.map_err(Error::GuestMemoryRegion)?,
MmapRegion::build(fo, size, libc::PROT_READ | libc::PROT_WRITE, mmap_flags)
.map_err(Error::GuestMemoryRegion)?,
start_addr,
)
.map_err(Error::GuestMemory)?;