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 = layout->stripe_unit;
  13         __u32 sc = layout->stripe_count;
  14         __u32 os = layout->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 void ceph_file_layout_from_legacy(struct ceph_file_layout *fl,
  31                                   struct ceph_file_layout_legacy *legacy)
  32 {
  33         fl->stripe_unit = le32_to_cpu(legacy->fl_stripe_unit);
  34         fl->stripe_count = le32_to_cpu(legacy->fl_stripe_count);
  35         fl->object_size = le32_to_cpu(legacy->fl_object_size);
  36         fl->pool_id = le32_to_cpu(legacy->fl_pg_pool);
  37         if (fl->pool_id == 0 && fl->stripe_unit == 0 &&
  38             fl->stripe_count == 0 && fl->object_size == 0)
  39                 fl->pool_id = -1;
  40 }
  41 EXPORT_SYMBOL(ceph_file_layout_from_legacy);
  42
  43 void ceph_file_layout_to_legacy(struct ceph_file_layout *fl,
  44                                 struct ceph_file_layout_legacy *legacy)
  45 {
  46         legacy->fl_stripe_unit = cpu_to_le32(fl->stripe_unit);
  47         legacy->fl_stripe_count = cpu_to_le32(fl->stripe_count);
  48         legacy->fl_object_size = cpu_to_le32(fl->object_size);
  49         if (fl->pool_id >= 0)
  50                 legacy->fl_pg_pool = cpu_to_le32(fl->pool_id);
  51         else
  52                 legacy->fl_pg_pool = 0;
  53 }
  54 EXPORT_SYMBOL(ceph_file_layout_to_legacy);
  55
  56 int ceph_flags_to_mode(int flags)
  57 {
  58         int mode;
  59
  60 #ifdef O_DIRECTORY  /* fixme */
  61         if ((flags & O_DIRECTORY) == O_DIRECTORY)
  62                 return CEPH_FILE_MODE_PIN;
  63 #endif
  64
  65         switch (flags & O_ACCMODE) {
  66         case O_WRONLY:
  67                 mode = CEPH_FILE_MODE_WR;
  68                 break;
  69         case O_RDONLY:
  70                 mode = CEPH_FILE_MODE_RD;
  71                 break;
  72         case O_RDWR:
  73         case O_ACCMODE: /* this is what the VFS does */
  74                 mode = CEPH_FILE_MODE_RDWR;
  75                 break;
  76         }
  77 #ifdef O_LAZY
  78         if (flags & O_LAZY)
  79                 mode |= CEPH_FILE_MODE_LAZY;
  80 #endif
  81
  82         return mode;
  83 }
  84 EXPORT_SYMBOL(ceph_flags_to_mode);
  85
  86 int ceph_caps_for_mode(int mode)
  87 {
  88         int caps = CEPH_CAP_PIN;
  89
  90         if (mode & CEPH_FILE_MODE_RD)
  91                 caps |= CEPH_CAP_FILE_SHARED |
  92                         CEPH_CAP_FILE_RD | CEPH_CAP_FILE_CACHE;
  93         if (mode & CEPH_FILE_MODE_WR)
  94                 caps |= CEPH_CAP_FILE_EXCL |
  95                         CEPH_CAP_FILE_WR | CEPH_CAP_FILE_BUFFER |
  96                         CEPH_CAP_AUTH_SHARED | CEPH_CAP_AUTH_EXCL |
  97                         CEPH_CAP_XATTR_SHARED | CEPH_CAP_XATTR_EXCL;
  98         if (mode & CEPH_FILE_MODE_LAZY)
  99                 caps |= CEPH_CAP_FILE_LAZYIO;
 100
 101         return caps;
 102 }
 103 EXPORT_SYMBOL(ceph_caps_for_mode);