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-rw-r--r--fs/ceph/ceph_fs.c74
1 files changed, 74 insertions, 0 deletions
diff --git a/fs/ceph/ceph_fs.c b/fs/ceph/ceph_fs.c
new file mode 100644
index 0000000..79d76bc
--- /dev/null
+++ b/fs/ceph/ceph_fs.c
@@ -0,0 +1,74 @@
+/*
+ * Some non-inline ceph helpers
+ */
+#include "types.h"
+
+/*
+ * return true if @layout appears to be valid
+ */
+int ceph_file_layout_is_valid(const struct ceph_file_layout *layout)
+{
+ __u32 su = le32_to_cpu(layout->fl_stripe_unit);
+ __u32 sc = le32_to_cpu(layout->fl_stripe_count);
+ __u32 os = le32_to_cpu(layout->fl_object_size);
+
+ /* stripe unit, object size must be non-zero, 64k increment */
+ if (!su || (su & (CEPH_MIN_STRIPE_UNIT-1)))
+ return 0;
+ if (!os || (os & (CEPH_MIN_STRIPE_UNIT-1)))
+ return 0;
+ /* object size must be a multiple of stripe unit */
+ if (os < su || os % su)
+ return 0;
+ /* stripe count must be non-zero */
+ if (!sc)
+ return 0;
+ return 1;
+}
+
+
+int ceph_flags_to_mode(int flags)
+{
+#ifdef O_DIRECTORY /* fixme */
+ if ((flags & O_DIRECTORY) == O_DIRECTORY)
+ return CEPH_FILE_MODE_PIN;
+#endif
+#ifdef O_LAZY
+ if (flags & O_LAZY)
+ return CEPH_FILE_MODE_LAZY;
+#endif
+ if ((flags & O_APPEND) == O_APPEND)
+ flags |= O_WRONLY;
+
+ flags &= O_ACCMODE;
+ if ((flags & O_RDWR) == O_RDWR)
+ return CEPH_FILE_MODE_RDWR;
+ if ((flags & O_WRONLY) == O_WRONLY)
+ return CEPH_FILE_MODE_WR;
+ return CEPH_FILE_MODE_RD;
+}
+
+int ceph_caps_for_mode(int mode)
+{
+ switch (mode) {
+ case CEPH_FILE_MODE_PIN:
+ return CEPH_CAP_PIN;
+ case CEPH_FILE_MODE_RD:
+ return CEPH_CAP_PIN | CEPH_CAP_FILE_SHARED |
+ CEPH_CAP_FILE_RD | CEPH_CAP_FILE_CACHE;
+ case CEPH_FILE_MODE_RDWR:
+ return CEPH_CAP_PIN | CEPH_CAP_FILE_SHARED |
+ CEPH_CAP_FILE_EXCL |
+ CEPH_CAP_FILE_RD | CEPH_CAP_FILE_CACHE |
+ CEPH_CAP_FILE_WR | CEPH_CAP_FILE_BUFFER |
+ CEPH_CAP_AUTH_SHARED | CEPH_CAP_AUTH_EXCL |
+ CEPH_CAP_XATTR_SHARED | CEPH_CAP_XATTR_EXCL;
+ case CEPH_FILE_MODE_WR:
+ return CEPH_CAP_PIN | CEPH_CAP_FILE_SHARED |
+ 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;
+ }
+ return 0;
+}
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