fs/ceph/ceph_fs.c

   1 /*
   2  * Some non-inline ceph helpers
   3  */
   4 #include "types.h"
   5
   6 /*
   7  * return true if @layout appears to be valid
   8  */
   9 int ceph_file_layout_is_valid(const struct ceph_file_layout *layout)
  10 {
  11         __u32 su = le32_to_cpu(layout->fl_stripe_unit);
  12         __u32 sc = le32_to_cpu(layout->fl_stripe_count);
  13         __u32 os = le32_to_cpu(layout->fl_object_size);
  14
  15         /* stripe unit, object size must be non-zero, 64k increment */
  16         if (!su || (su & (CEPH_MIN_STRIPE_UNIT-1)))
  17                 return 0;
  18         if (!os || (os & (CEPH_MIN_STRIPE_UNIT-1)))
  19                 return 0;
  20         /* object size must be a multiple of stripe unit */
  21         if (os < su || os % su)
  22                 return 0;
  23         /* stripe count must be non-zero */
  24         if (!sc)
  25                 return 0;
  26         return 1;
  27 }
  28
  29
  30 int ceph_flags_to_mode(int flags)
  31 {
  32 #ifdef O_DIRECTORY  /* fixme */
  33         if ((flags & O_DIRECTORY) == O_DIRECTORY)
  34                 return CEPH_FILE_MODE_PIN;
  35 #endif
  36 #ifdef O_LAZY
  37         if (flags & O_LAZY)
  38                 return CEPH_FILE_MODE_LAZY;
  39 #endif
  40         if ((flags & O_APPEND) == O_APPEND)
  41                 flags |= O_WRONLY;
  42
  43         flags &= O_ACCMODE;
  44         if ((flags & O_RDWR) == O_RDWR)
  45                 return CEPH_FILE_MODE_RDWR;
  46         if ((flags & O_WRONLY) == O_WRONLY)
  47                 return CEPH_FILE_MODE_WR;
  48         return CEPH_FILE_MODE_RD;
  49 }
  50
  51 int ceph_caps_for_mode(int mode)
  52 {
  53         switch (mode) {
  54         case CEPH_FILE_MODE_PIN:
  55                 return CEPH_CAP_PIN;
  56         case CEPH_FILE_MODE_RD:
  57                 return CEPH_CAP_PIN | CEPH_CAP_FILE_SHARED |
  58                         CEPH_CAP_FILE_RD | CEPH_CAP_FILE_CACHE;
  59         case CEPH_FILE_MODE_RDWR:
  60                 return CEPH_CAP_PIN | CEPH_CAP_FILE_SHARED |
  61                         CEPH_CAP_FILE_EXCL |
  62                         CEPH_CAP_FILE_RD | CEPH_CAP_FILE_CACHE |
  63                         CEPH_CAP_FILE_WR | CEPH_CAP_FILE_BUFFER |
  64                         CEPH_CAP_AUTH_SHARED | CEPH_CAP_AUTH_EXCL |
  65                         CEPH_CAP_XATTR_SHARED | CEPH_CAP_XATTR_EXCL;
  66         case CEPH_FILE_MODE_WR:
  67                 return CEPH_CAP_PIN | CEPH_CAP_FILE_SHARED |
  68                         CEPH_CAP_FILE_EXCL |
  69                         CEPH_CAP_FILE_WR | CEPH_CAP_FILE_BUFFER |
  70                         CEPH_CAP_AUTH_SHARED | CEPH_CAP_AUTH_EXCL |
  71                         CEPH_CAP_XATTR_SHARED | CEPH_CAP_XATTR_EXCL;
  72         }
  73         return 0;
  74 }