include/linux/t10-pi.h

   1 #ifndef _LINUX_T10_PI_H
   2 #define _LINUX_T10_PI_H
   3
   4 #include <linux/types.h>
   5 #include <linux/blkdev.h>
   6
   7 /*
   8  * A T10 PI-capable target device can be formatted with different
   9  * protection schemes.  Currently 0 through 3 are defined:
  10  *
  11  * Type 0 is regular (unprotected) I/O
  12  *
  13  * Type 1 defines the contents of the guard and reference tags
  14  *
  15  * Type 2 defines the contents of the guard and reference tags and
  16  * uses 32-byte commands to seed the latter
  17  *
  18  * Type 3 defines the contents of the guard tag only
  19  */
  20 enum t10_dif_type {
  21         T10_PI_TYPE0_PROTECTION = 0x0,
  22         T10_PI_TYPE1_PROTECTION = 0x1,
  23         T10_PI_TYPE2_PROTECTION = 0x2,
  24         T10_PI_TYPE3_PROTECTION = 0x3,
  25 };
  26
  27 /*
  28  * T10 Protection Information tuple.
  29  */
  30 struct t10_pi_tuple {
  31         __be16 guard_tag;       /* Checksum */
  32         __be16 app_tag;         /* Opaque storage */
  33         __be32 ref_tag;         /* Target LBA or indirect LBA */
  34 };
  35
  36 #define T10_PI_APP_ESCAPE cpu_to_be16(0xffff)
  37 #define T10_PI_REF_ESCAPE cpu_to_be32(0xffffffff)
  38
  39 extern const struct blk_integrity_profile t10_pi_type1_crc;
  40 extern const struct blk_integrity_profile t10_pi_type1_ip;
  41 extern const struct blk_integrity_profile t10_pi_type3_crc;
  42 extern const struct blk_integrity_profile t10_pi_type3_ip;
  43
  44 #endif