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