release/src-rt-6.x.4708/linux/linux-2.6.36/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         int mode;
  33
  34 #ifdef O_DIRECTORY
  35         if ((flags & O_DIRECTORY) == O_DIRECTORY)
  36                 return CEPH_FILE_MODE_PIN;
  37 #endif
  38         if ((flags & O_APPEND) == O_APPEND)
  39                 flags |= O_WRONLY;
  40
  41         if ((flags & O_ACCMODE) == O_RDWR)
  42                 mode = CEPH_FILE_MODE_RDWR;
  43         else if ((flags & O_ACCMODE) == O_WRONLY)
  44                 mode = CEPH_FILE_MODE_WR;
  45         else
  46                 mode = CEPH_FILE_MODE_RD;
  47
  48 #ifdef O_LAZY
  49         if (flags & O_LAZY)
  50                 mode |= CEPH_FILE_MODE_LAZY;
  51 #endif
  52
  53         return mode;
  54 }
  55
  56 int ceph_caps_for_mode(int mode)
  57 {
  58         int caps = CEPH_CAP_PIN;
  59
  60         if (mode & CEPH_FILE_MODE_RD)
  61                 caps |= CEPH_CAP_FILE_SHARED |
  62                         CEPH_CAP_FILE_RD | CEPH_CAP_FILE_CACHE;
  63         if (mode & CEPH_FILE_MODE_WR)
  64                 caps |= CEPH_CAP_FILE_EXCL |
  65                         CEPH_CAP_FILE_WR | CEPH_CAP_FILE_BUFFER |
  66                         CEPH_CAP_AUTH_SHARED | CEPH_CAP_AUTH_EXCL |
  67                         CEPH_CAP_XATTR_SHARED | CEPH_CAP_XATTR_EXCL;
  68         if (mode & CEPH_FILE_MODE_LAZY)
  69                 caps |= CEPH_CAP_FILE_LAZYIO;
  70
  71         return caps;
  72 }