1 files changed, 91 insertions, 0 deletions
diff --git a/src/common/ceph_fs.cc b/src/common/ceph_fs.cc
new file mode 100644
index 000000000..380b401df
--- /dev/null
+++ b/src/common/ceph_fs.cc
@@ -0,0 +1,91 @@
+/*
+ * ceph_fs.cc - Some Ceph functions that are shared between kernel space and
+ * user space.
+ *
+ */
+
+/*
+ * Some non-inline ceph helpers
+ */
+#include "include/types.h"
+
+int ceph_flags_to_mode(int flags)
+{
+	/* because CEPH_FILE_MODE_PIN is zero, so mode = -1 is error */
+	int mode = -1;
+
+	if ((flags & CEPH_O_DIRECTORY) == CEPH_O_DIRECTORY)
+		return CEPH_FILE_MODE_PIN;
+
+	switch (flags & O_ACCMODE) {
+	case CEPH_O_WRONLY:
+		mode = CEPH_FILE_MODE_WR;
+		break;
+	case CEPH_O_RDONLY:
+		mode = CEPH_FILE_MODE_RD;
+		break;
+	case CEPH_O_RDWR:
+	case O_ACCMODE: /* this is what the VFS does */
+		mode = CEPH_FILE_MODE_RDWR;
+		break;
+	}
+
+	if (flags & CEPH_O_LAZY)
+		mode |= CEPH_FILE_MODE_LAZY;
+
+	return mode;
+}
+
+int ceph_caps_for_mode(int mode)
+{
+	int caps = CEPH_CAP_PIN;
+
+	if (mode & CEPH_FILE_MODE_RD)
+		caps |= CEPH_CAP_FILE_SHARED |
+			CEPH_CAP_FILE_RD | CEPH_CAP_FILE_CACHE;
+	if (mode & CEPH_FILE_MODE_WR)
+		caps |= CEPH_CAP_FILE_EXCL |
+			CEPH_CAP_FILE_WR | CEPH_CAP_FILE_BUFFER |
+			CEPH_CAP_AUTH_SHARED | CEPH_CAP_AUTH_EXCL |
+			CEPH_CAP_XATTR_SHARED | CEPH_CAP_XATTR_EXCL;
+	if (mode & CEPH_FILE_MODE_LAZY)
+		caps |= CEPH_CAP_FILE_LAZYIO;
+
+	return caps;
+}
+
+int ceph_flags_sys2wire(int flags)
+{
+       int wire_flags = 0;
+
+       switch (flags & O_ACCMODE) {
+       case O_RDONLY:
+               wire_flags |= CEPH_O_RDONLY;
+               break;
+       case O_WRONLY:
+               wire_flags |= CEPH_O_WRONLY;
+               break;
+       case O_RDWR:
+               wire_flags |= CEPH_O_RDWR;
+               break;
+       }
+       flags &= ~O_ACCMODE;
+
+#define ceph_sys2wire(a) if (flags & a) { wire_flags |= CEPH_##a; flags &= ~a; }
+
+       ceph_sys2wire(O_CREAT);
+       ceph_sys2wire(O_EXCL);
+       ceph_sys2wire(O_TRUNC);
+
+       #ifndef _WIN32
+       ceph_sys2wire(O_DIRECTORY);
+       ceph_sys2wire(O_NOFOLLOW);
+       // In some cases, FILE_FLAG_BACKUP_SEMANTICS may be used instead
+       // of O_DIRECTORY. We may need some workarounds in order to handle
+       // the fact that those flags are not available on Windows.
+       #endif
+
+#undef ceph_sys2wire
+
+       return wire_flags;
+}