ceph/src/common/ceph_fs.cc

   1 /*
   2  * ceph_fs.cc - Some Ceph functions that are shared between kernel space and
   3  * user space.
   4  *
   5  */
   6
   7 /*
   8  * Some non-inline ceph helpers
   9  */
  10 #include "include/types.h"
  11
  12 int ceph_flags_to_mode(int flags)
  13 {
  14         /* because CEPH_FILE_MODE_PIN is zero, so mode = -1 is error */
  15         int mode = -1;
  16
  17 #ifdef O_DIRECTORY  /* fixme */
  18         if ((flags & CEPH_O_DIRECTORY) == CEPH_O_DIRECTORY)
  19                 return CEPH_FILE_MODE_PIN;
  20 #endif
  21
  22         switch (flags & O_ACCMODE) {
  23         case CEPH_O_WRONLY:
  24                 mode = CEPH_FILE_MODE_WR;
  25                 break;
  26         case CEPH_O_RDONLY:
  27                 mode = CEPH_FILE_MODE_RD;
  28                 break;
  29         case CEPH_O_RDWR:
  30         case O_ACCMODE: /* this is what the VFS does */
  31                 mode = CEPH_FILE_MODE_RDWR;
  32                 break;
  33         }
  34
  35         return mode;
  36 }
  37
  38 int ceph_caps_for_mode(int mode)
  39 {
  40         int caps = CEPH_CAP_PIN;
  41
  42         if (mode & CEPH_FILE_MODE_RD)
  43                 caps |= CEPH_CAP_FILE_SHARED |
  44                         CEPH_CAP_FILE_RD | CEPH_CAP_FILE_CACHE;
  45         if (mode & CEPH_FILE_MODE_WR)
  46                 caps |= CEPH_CAP_FILE_EXCL |
  47                         CEPH_CAP_FILE_WR | CEPH_CAP_FILE_BUFFER |
  48                         CEPH_CAP_AUTH_SHARED | CEPH_CAP_AUTH_EXCL |
  49                         CEPH_CAP_XATTR_SHARED | CEPH_CAP_XATTR_EXCL;
  50         if (mode & CEPH_FILE_MODE_LAZY)
  51                 caps |= CEPH_CAP_FILE_LAZYIO;
  52
  53         return caps;
  54 }
  55
  56 int ceph_flags_sys2wire(int flags)
  57 {
  58        int wire_flags = 0;
  59
  60        switch (flags & O_ACCMODE) {
  61        case O_RDONLY:
  62                wire_flags |= CEPH_O_RDONLY;
  63                break;
  64        case O_WRONLY:
  65                wire_flags |= CEPH_O_WRONLY;
  66                break;
  67        case O_RDWR:
  68                wire_flags |= CEPH_O_RDWR;
  69                break;
  70        }
  71        flags &= ~O_ACCMODE;
  72
  73 #define ceph_sys2wire(a) if (flags & a) { wire_flags |= CEPH_##a; flags &= ~a; }
  74
  75        ceph_sys2wire(O_CREAT);
  76        ceph_sys2wire(O_EXCL);
  77        ceph_sys2wire(O_TRUNC);
  78        ceph_sys2wire(O_DIRECTORY);
  79        ceph_sys2wire(O_NOFOLLOW);
  80
  81 #undef ceph_sys2wire
  82
  83        return wire_flags;
  84 }