From c5eb44d9680d19b805078ebd527ca337a4363735 Mon Sep 17 00:00:00 2001
From: 4lDO2 <4lDO2@protonmail.com>
Date: Sun, 2 Jul 2023 15:41:42 +0200
Subject: [PATCH] Increase refcount for borrowed fmap too.
---
src/context/memory.rs | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/src/context/memory.rs b/src/context/memory.rs
index 3f8c192b..0f2cec80 100644
--- a/src/context/memory.rs
+++ b/src/context/memory.rs
@@ -589,6 +589,11 @@ pub enum Provider {
/// The memory is borrowed directly from another address space.
External { address_space: Arc<RwLock<AddrSpace>>, src_base: Page, is_pinned_userscheme_borrow: bool },
+ /// The memory is MAP_SHARED borrowed from a scheme.
+ ///
+ /// Since the address space is not tracked here, all nonpresent pages (all pages must be
+ /// present before the fmap operation completes, unless MAP_LAZY is specified) are tracked
+ /// using PageInfo, or treated as PhysBorrowed if any frame lacks a PageInfo.
FmapBorrowed { file_ref: GrantFileRef },
}
@@ -674,6 +679,11 @@ impl Grant {
let src_page = src.src_page.next_by(dst_page.offset_from(span.base));
let (frame, _) = src.src_mapper.translate(src_page.start_address()).unwrap();
+
+ if let Some(page_info) = get_page_info(Frame::containing_address(frame)) {
+ page_info.add_ref(false);
+ }
+
unsafe {
flusher.consume(mapper.map_phys(dst_page.start_address(), frame, flags).unwrap());
}
--
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