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 37 extern struct blk_integrity_profile t10_pi_type1_crc; 38 extern struct blk_integrity_profile t10_pi_type1_ip; 39 extern struct blk_integrity_profile t10_pi_type3_crc; 40 extern struct blk_integrity_profile t10_pi_type3_ip; 41 42 #endif 43