net/ceph/ceph_fs.c

   1 /*
   2  * Some non-inline ceph helpers
   3  */
   4 #include <linux/module.h>
   5 #include <linux/ceph/types.h>
   6
   7 /*
   8  * return true if @layout appears to be valid
   9  */
  10 int ceph_file_layout_is_valid(const struct ceph_file_layout *layout)
  11 {
  12         __u32 su = le32_to_cpu(layout->fl_stripe_unit);
  13         __u32 sc = le32_to_cpu(layout->fl_stripe_count);
  14         __u32 os = le32_to_cpu(layout->fl_object_size);
  15
  16         /* stripe unit, object size must be non-zero, 64k increment */
  17         if (!su || (su & (CEPH_MIN_STRIPE_UNIT-1)))
  18                 return 0;
  19         if (!os || (os & (CEPH_MIN_STRIPE_UNIT-1)))
  20                 return 0;
  21         /* object size must be a multiple of stripe unit */
  22         if (os < su || os % su)
  23                 return 0;
  24         /* stripe count must be non-zero */
  25         if (!sc)
  26                 return 0;
  27         return 1;
  28 }
  29
  30
  31 int ceph_flags_to_mode(int flags)
  32 {
  33         int mode;
  34
  35 #ifdef O_DIRECTORY  /* fixme */
  36         if ((flags & O_DIRECTORY) == O_DIRECTORY)
  37                 return CEPH_FILE_MODE_PIN;
  38 #endif
  39
  40         switch (flags & O_ACCMODE) {
  41         case O_WRONLY:
  42                 mode = CEPH_FILE_MODE_WR;
  43                 break;
  44         case O_RDONLY:
  45                 mode = CEPH_FILE_MODE_RD;
  46                 break;
  47         case O_RDWR:
  48         case O_ACCMODE: /* this is what the VFS does */
  49                 mode = CEPH_FILE_MODE_RDWR;
  50                 break;
  51         }
  52 #ifdef O_LAZY
  53         if (flags & O_LAZY)
  54                 mode |= CEPH_FILE_MODE_LAZY;
  55 #endif
  56
  57         return mode;
  58 }
  59 EXPORT_SYMBOL(ceph_flags_to_mode);
  60
  61 int ceph_caps_for_mode(int mode)
  62 {
  63         int caps = CEPH_CAP_PIN;
  64
  65         if (mode & CEPH_FILE_MODE_RD)
  66                 caps |= CEPH_CAP_FILE_SHARED |
  67                         CEPH_CAP_FILE_RD | CEPH_CAP_FILE_CACHE;
  68         if (mode & CEPH_FILE_MODE_WR)
  69                 caps |= CEPH_CAP_FILE_EXCL |
  70                         CEPH_CAP_FILE_WR | CEPH_CAP_FILE_BUFFER |
  71                         CEPH_CAP_AUTH_SHARED | CEPH_CAP_AUTH_EXCL |
  72                         CEPH_CAP_XATTR_SHARED | CEPH_CAP_XATTR_EXCL;
  73         if (mode & CEPH_FILE_MODE_LAZY)
  74                 caps |= CEPH_CAP_FILE_LAZYIO;
  75
  76         return caps;
  77 }
  78 EXPORT_SYMBOL(ceph_caps_for_mode);