ceph: fix file open flags on ppc64

The file open flags (O_foo) are platform specific and should never go
out to an interface that is not local to the system.

Unfortunately these flags have leaked out onto the wire in the cephfs
implementation. That lead to bogus flags getting transmitted on ppc64.

This patch converts the kernel view of flags to the ceph view of file
open flags.

Fixes: 124e68e74 ("ceph: file operations")
Signed-off-by: Alexander Graf <agraf@suse.de>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 39866d6..9d2eeed 100644 (file)
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -13,6 +13,38 @@
 #include "mds_client.h"
 #include "cache.h"
 
+static __le32 ceph_flags_sys2wire(u32 flags)
+{
+       u32 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;
+       }
+
+#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);
+       ceph_sys2wire(O_DIRECTORY);
+       ceph_sys2wire(O_NOFOLLOW);
+
+#undef ceph_sys2wire
+
+       if (flags)
+               dout("unused open flags: %x", flags);
+
+       return cpu_to_le32(wire_flags);
+}
+
 /*
  * Ceph file operations
  *
@@ -123,7 +155,7 @@ prepare_open_request(struct super_block *sb, int flags, int create_mode)
        if (IS_ERR(req))
                goto out;
        req->r_fmode = ceph_flags_to_mode(flags);
-       req->r_args.open.flags = cpu_to_le32(flags);
+       req->r_args.open.flags = ceph_flags_sys2wire(flags);
        req->r_args.open.mode = cpu_to_le32(create_mode);
 out:
        return req;

diff --git a/include/linux/ceph/ceph_fs.h b/include/linux/ceph/ceph_fs.h
index 1787e4a..ad078eb 100644 (file)
--- a/include/linux/ceph/ceph_fs.h
+++ b/include/linux/ceph/ceph_fs.h
@@ -367,6 +367,18 @@ extern const char *ceph_mds_op_name(int op);
 #define CEPH_READDIR_HASH_ORDER                (1<<9)
 #define CEPH_READDIR_OFFSET_HASH       (1<<10)
 
+/*
+ * open request flags
+ */
+#define CEPH_O_RDONLY          00000000
+#define CEPH_O_WRONLY          00000001
+#define CEPH_O_RDWR            00000002
+#define CEPH_O_CREAT           00000100
+#define CEPH_O_EXCL            00000200
+#define CEPH_O_TRUNC           00001000
+#define CEPH_O_DIRECTORY       00200000
+#define CEPH_O_NOFOLLOW                00400000
+
 union ceph_mds_request_args {
        struct {
                __le32 mask;                 /* CEPH_CAP_* */