From f775ff7d89f33fc9ba63f6f70df3bcc98c2d9828 Mon Sep 17 00:00:00 2001 From: Alexander Graf Date: Thu, 27 Apr 2017 18:34:00 +0200 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. Fixes: 124e68e74 ("ceph: file operations") Signed-off-by: Alexander Graf Reviewed-by: "Yan, Zheng" Signed-off-by: Ilya Dryomov --- fs/ceph/file.c | 34 +++++++++++++++++++++++++++++++++- include/linux/ceph/ceph_fs.h | 12 ++++++++++++ 2 files changed, 45 insertions(+), 1 deletion(-) diff --git a/fs/ceph/file.c b/fs/ceph/file.c index 39866d6a34b6..9d2eeed9e323 100644 --- 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 1787e4a8e251..ad078ebe25d6 100644 --- 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_* */ -- 2.20.1