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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>
This commit is contained in:
Alexander Graf 2017-04-27 18:34:00 +02:00 committed by Ilya Dryomov
parent b50c2de51e
commit f775ff7d89
2 changed files with 45 additions and 1 deletions
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34
fs/ceph/file.c
View File

@ -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;

12
include/linux/ceph/ceph_fs.h
View File

@ -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_* */