arch/s390/include/uapi/asm/vtoc.h

Source file repositories/reference/linux-study-clean/arch/s390/include/uapi/asm/vtoc.h

File Facts

System
Linux kernel
Corpus path
arch/s390/include/uapi/asm/vtoc.h
Extension
.h
Size
7539 bytes
Lines
215
Domain
Architecture Layer
Bucket
arch/s390
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

struct vtoc_volume_label_ldl {
	char vollbl[4];		/* volume label */
	char volid[6];		/* volume identifier */
	char res3[69];		/* reserved */
	char ldl_version;	/* version number, valid for ldl format */
	__u64 formatted_blocks; /* valid when ldl_version >= f2  */
} __attribute__ ((packed));

struct vtoc_extent
{
	__u8 typeind;			/* extent type indicator */
	__u8 seqno;			/* extent sequence number */
	struct vtoc_cchh llimit;	/* starting point of this extent */
	struct vtoc_cchh ulimit;	/* ending point of this extent */
} __attribute__ ((packed));

struct vtoc_dev_const
{
	__u16 DS4DSCYL;	/* number of logical cyls */
	__u16 DS4DSTRK;	/* number of tracks in a logical cylinder */
	__u16 DS4DEVTK;	/* device track length */
	__u8 DS4DEVI;	/* non-last keyed record overhead */
	__u8 DS4DEVL;	/* last keyed record overhead */
	__u8 DS4DEVK;	/* non-keyed record overhead differential */
	__u8 DS4DEVFG;	/* flag byte */
	__u16 DS4DEVTL;	/* device tolerance */
	__u8 DS4DEVDT;	/* number of DSCB's per track */
	__u8 DS4DEVDB;	/* number of directory blocks per track */
} __attribute__ ((packed));

struct vtoc_format1_label
{
	char DS1DSNAM[44];	/* data set name */
	__u8 DS1FMTID;		/* format identifier */
	char DS1DSSN[6];	/* data set serial number */
	__u16 DS1VOLSQ;		/* volume sequence number */
	struct vtoc_labeldate DS1CREDT; /* creation date: ydd */
	struct vtoc_labeldate DS1EXPDT; /* expiration date */
	__u8 DS1NOEPV;		/* number of extents on volume */
	__u8 DS1NOBDB;		/* no. of bytes used in last direction blk */
	__u8 DS1FLAG1;		/* flag 1 */
	char DS1SYSCD[13];	/* system code */
	struct vtoc_labeldate DS1REFD; /* date last referenced	*/
	__u8 DS1SMSFG;		/* system managed storage indicators */
	__u8 DS1SCXTF;		/* sec. space extension flag byte */
	__u16 DS1SCXTV;		/* secondary space extension value */
	__u8 DS1DSRG1;		/* data set organisation byte 1 */
	__u8 DS1DSRG2;		/* data set organisation byte 2 */
	__u8 DS1RECFM;		/* record format */
	__u8 DS1OPTCD;		/* option code */
	__u16 DS1BLKL;		/* block length */
	__u16 DS1LRECL;		/* record length */
	__u8 DS1KEYL;		/* key length */
	__u16 DS1RKP;		/* relative key position */
	__u8 DS1DSIND;		/* data set indicators */
	__u8 DS1SCAL1;		/* secondary allocation flag byte */
	char DS1SCAL3[3];	/* secondary allocation quantity */
	struct vtoc_ttr DS1LSTAR; /* last used track and block on track */
	__u16 DS1TRBAL;		/* space remaining on last used track */
	__u16 res1;		/* reserved */
	struct vtoc_extent DS1EXT1; /* first extent description */
	struct vtoc_extent DS1EXT2; /* second extent description */
	struct vtoc_extent DS1EXT3; /* third extent description */
	struct vtoc_cchhb DS1PTRDS; /* possible pointer to f2 or f3 DSCB */
} __attribute__ ((packed));

struct vtoc_format4_label
{
	char DS4KEYCD[44];	/* key code for VTOC labels: 44 times 0x04 */
	__u8 DS4IDFMT;		/* format identifier */
	struct vtoc_cchhb DS4HPCHR; /* highest address of a format 1 DSCB */
	__u16 DS4DSREC;		/* number of available DSCB's */
	struct vtoc_cchh DS4HCCHH; /* CCHH of next available alternate track */
	__u16 DS4NOATK;		/* number of remaining alternate tracks */
	__u8 DS4VTOCI;		/* VTOC indicators */
	__u8 DS4NOEXT;		/* number of extents in VTOC */
	__u8 DS4SMSFG;		/* system managed storage indicators */
	__u8 DS4DEVAC;		/* number of alternate cylinders.
				 * Subtract from first two bytes of
				 * DS4DEVSZ to get number of usable
				 * cylinders. can be zero. valid
				 * only if DS4DEVAV on. */
	struct vtoc_dev_const DS4DEVCT;	/* device constants */
	char DS4AMTIM[8];	/* VSAM time stamp */
	char DS4AMCAT[3];	/* VSAM catalog indicator */
	char DS4R2TIM[8];	/* VSAM volume/catalog match time stamp */
	char res1[5];		/* reserved */
	char DS4F6PTR[5];	/* pointer to first format 6 DSCB */
	struct vtoc_extent DS4VTOCE; /* VTOC extent description */
	char res2[10];		/* reserved */

Annotation

Implementation Notes