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Kernel+LibC: Implement fcntl(2) advisory locks

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Advisory locks don't actually prevent other processes from writing to
the file, but they do prevent other processes looking to acquire and
advisory lock on the file.

This implementation currently only adds non-blocking locks, which are
all I need for now.
This commit is contained in:
Peter Elliott 2021-07-18 23:29:56 -06:00 • committed by Ali Mohammad Pur
parent fbc56461da
commit 3fa2816642
8 changed files with 186 additions and 7 deletions
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15
Kernel/FileSystem/Inode.h
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@ -97,6 +97,11 @@ public:
NonnullRefPtr<FIFO> fifo();
KResult can_apply_flock(FileDescription const&, flock const&) const;
KResult apply_flock(Process const&, FileDescription const&, Userspace<flock const*>);
KResult get_flock(FileDescription const&, Userspace<flock*>) const;
void remove_flocks_for_description(FileDescription const&);
protected:
Inode(FileSystem&, InodeIndex);
void set_metadata_dirty(bool);
@ -119,6 +124,16 @@ private:
RefPtr<FIFO> m_fifo;
IntrusiveListNode<Inode> m_inode_list_node;
struct Flock {
short type;
off_t start;
off_t len;
FileDescription const* owner;
pid_t pid;
};
Vector<Flock> m_flocks;
public:
using List = IntrusiveList<Inode, RawPtr<Inode>, &Inode::m_inode_list_node>;
};