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/*
* ceph_fs.cc - Some Ceph functions that are shared between kernel space and
* user space.
*
*/
/*
* Some non-inline ceph helpers
*/
#include "include/types.h"
int ceph_flags_to_mode(int flags)
{
/* because CEPH_FILE_MODE_PIN is zero, so mode = -1 is error */
int mode = -1;
if ((flags & CEPH_O_DIRECTORY) == CEPH_O_DIRECTORY)
return CEPH_FILE_MODE_PIN;
switch (flags & O_ACCMODE) {
case CEPH_O_WRONLY:
mode = CEPH_FILE_MODE_WR;
break;
case CEPH_O_RDONLY:
mode = CEPH_FILE_MODE_RD;
break;
case CEPH_O_RDWR:
case O_ACCMODE: /* this is what the VFS does */
mode = CEPH_FILE_MODE_RDWR;
break;
}
if (flags & CEPH_O_LAZY)
mode |= CEPH_FILE_MODE_LAZY;
return mode;
}
int ceph_caps_for_mode(int mode)
{
int caps = CEPH_CAP_PIN;
if (mode & CEPH_FILE_MODE_RD)
caps |= CEPH_CAP_FILE_SHARED |
CEPH_CAP_FILE_RD | CEPH_CAP_FILE_CACHE;
if (mode & CEPH_FILE_MODE_WR)
caps |= 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;
if (mode & CEPH_FILE_MODE_LAZY)
caps |= CEPH_CAP_FILE_LAZYIO;
return caps;
}
int ceph_flags_sys2wire(int flags)
{
int 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_EXCL);
ceph_sys2wire(O_TRUNC);
#ifndef _WIN32
ceph_sys2wire(O_DIRECTORY);
ceph_sys2wire(O_NOFOLLOW);
// In some cases, FILE_FLAG_BACKUP_SEMANTICS may be used instead
// of O_DIRECTORY. We may need some workarounds in order to handle
// the fact that those flags are not available on Windows.
#endif
#undef ceph_sys2wire
return wire_flags;
}
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