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Kernel: Implement basic support for sys$mmap() with MAP_PRIVATE

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You can now mmap a file as private and writable, and the changes you
make will only be visible to you.

This works because internally a MAP_PRIVATE region is backed by a
unique PrivateInodeVMObject instead of using the globally shared
SharedInodeVMObject like we always did before. :^)

Fixes #1045.
This commit is contained in:
Andreas Kling 2020-02-28 20:47:27 +01:00
parent aa1e209845
commit 8fbdda5a2d
11 changed files with 45 additions and 31 deletions
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2
Kernel/FileSystem/FileDescription.h
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@ -109,7 +109,7 @@ public:
Custody* custody() { return m_custody.ptr(); }
const Custody* custody() const { return m_custody.ptr(); }
KResultOr<Region*> mmap(Process&, VirtualAddress, size_t offset, size_t, int prot);
KResultOr<Region*> mmap(Process&, VirtualAddress, size_t offset, size_t, int prot, bool shared);
bool is_blocking() const { return m_is_blocking; }
void set_blocking(bool b) { m_is_blocking = b; }