move Rust sources to top level, C sources into c_src

This moves the Rust sources out of rust_src/ and into the top level.
Running the bcachefs executable out of the development tree is now:

$ ./target/release/bcachefs command
or
$ cargo run --profile release -- command

instead of "./bcachefs command".

Building and installing is still:

$ make && make install

Signed-off-by: Thomas Bertschinger <tahbertschinger@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

1 files changed, 31 insertions, 0 deletions

diff --git a/c_src/include/linux/sched/mm.h b/c_src/include/linux/sched/mm.h
new file mode 100644
index 00000000..03feda7a
--- /dev/null
+++ b/c_src/include/linux/sched/mm.h
@@ -0,0 +1,31 @@
+#ifndef _LINUX_SCHED_MM_H
+#define _LINUX_SCHED_MM_H
+
+#define PF_MEMALLOC		0x00000800	/* Allocating memory */
+#define PF_MEMALLOC_NOFS	0x00040000	/* All allocation requests will inherit GFP_NOFS */
+
+static inline unsigned int memalloc_nofs_save(void)
+{
+	unsigned int flags = current->flags & PF_MEMALLOC_NOFS;
+	current->flags |= PF_MEMALLOC_NOFS;
+	return flags;
+}
+
+static inline void memalloc_nofs_restore(unsigned int flags)
+{
+	current->flags = (current->flags & ~PF_MEMALLOC_NOFS) | flags;
+}
+
+static inline unsigned int memalloc_noreclaim_save(void)
+{
+	unsigned int flags = current->flags & PF_MEMALLOC;
+	current->flags |= PF_MEMALLOC;
+	return flags;
+}
+
+static inline void memalloc_noreclaim_restore(unsigned int flags)
+{
+	current->flags = (current->flags & ~PF_MEMALLOC) | flags;
+}
+
+#endif /* _LINUX_SCHED_MM_H */