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Linux/net/ceph/ceph_fs.c

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  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);
 79 

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