linux-kernel - [PATCH] ceph: Fix file open flags on ppc64

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Message-Id: <1492692030-146869-1-git-send-email-agraf@suse.de>
Date:   Thu, 20 Apr 2017 14:40:30 +0200
From:   Alexander Graf <agraf@...e.de>
To:     ceph-devel@...r.kernel.org
Cc:     zyan@...hat.com, Sage Weil <sage@...hat.com>,
        Ilya Dryomov <idryomov@...il.com>,
        linux-kernel@...r.kernel.org, Jan.Fajerski@...e.com
Subject: [PATCH] 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. On x86 systems, the new function should get optimized out
by smart compilers. On systems where the flags differ, it should adapt
them accordingly.

Fixes: 124e68e74 ("ceph: file operations")
Signed-off-by: Alexander Graf <agraf@...e.de>
---
 fs/ceph/file.c               | 45 +++++++++++++++++++++++++++++++++++++++++++-
 include/linux/ceph/ceph_fs.h | 24 +++++++++++++++++++++++
 2 files changed, 68 insertions(+), 1 deletion(-)

diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 26cc954..0ed6392 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -103,6 +103,49 @@ static size_t dio_get_pagev_size(const struct iov_iter *it)
 	return ERR_PTR(ret);
 }
 
+static u32 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;
+	}
+	flags &= ~O_ACCMODE;
+
+#define ceph_sys2wire(a) if (flags & a) { wire_flags |= CEPH_##a; flags &= ~a; }
+
+	ceph_sys2wire(O_CREAT);
+	ceph_sys2wire(O_NOCTTY);
+	ceph_sys2wire(O_TRUNC);
+	ceph_sys2wire(O_APPEND);
+	ceph_sys2wire(O_NONBLOCK);
+	ceph_sys2wire(O_DSYNC);
+	ceph_sys2wire(FASYNC);
+	ceph_sys2wire(O_DIRECT);
+	ceph_sys2wire(O_LARGEFILE);
+	ceph_sys2wire(O_DIRECTORY);
+	ceph_sys2wire(O_NOFOLLOW);
+	ceph_sys2wire(O_NOATIME);
+	ceph_sys2wire(O_CLOEXEC);
+	ceph_sys2wire(__O_SYNC);
+	ceph_sys2wire(O_PATH);
+	ceph_sys2wire(__O_TMPFILE);
+
+#undef ceph_sys2wire
+
+	WARN_ONCE(flags, "Found unknown open flags: %x", flags);
+
+	return wire_flags;
+}
+
 /*
  * Prepare an open request.  Preallocate ceph_cap to avoid an
  * inopportune ENOMEM later.
@@ -123,7 +166,7 @@ static size_t dio_get_pagev_size(const struct iov_iter *it)
 	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(cpu_to_le32(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 f4b2ee1..d254b48 100644
--- a/include/linux/ceph/ceph_fs.h
+++ b/include/linux/ceph/ceph_fs.h
@@ -366,6 +366,30 @@ enum {
 #define CEPH_READDIR_FRAG_COMPLETE	(1<<8)
 #define CEPH_READDIR_HASH_ORDER		(1<<9)
 
+/*
+ * 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_NOCTTY		00000400
+#define CEPH_O_TRUNC		00001000
+#define CEPH_O_APPEND		00002000
+#define CEPH_O_NONBLOCK		00004000
+#define CEPH_O_DSYNC		00010000
+#define CEPH_FASYNC		00020000
+#define CEPH_O_DIRECT		00040000
+#define CEPH_O_LARGEFILE	00100000
+#define CEPH_O_DIRECTORY	00200000
+#define CEPH_O_NOFOLLOW		00400000
+#define CEPH_O_NOATIME		01000000
+#define CEPH_O_CLOEXEC		02000000
+#define CEPH___O_SYNC		04000000
+#define CEPH_O_PATH		010000000
+#define CEPH___O_TMPFILE	020000000
+
 union ceph_mds_request_args {
 	struct {
 		__le32 mask;                 /* CEPH_CAP_* */
-- 
1.8.5.6