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vtoc.h
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1 /*
2  * This file contains volume label definitions for DASD devices.
3  *
4  * Copyright IBM Corp. 2005
5  *
6  * Author(s): Volker Sameske <[email protected]>
7  *
8  */
9 
10 #ifndef _ASM_S390_VTOC_H
11 #define _ASM_S390_VTOC_H
12 
13 #include <linux/types.h>
14 
15 struct vtoc_ttr
16 {
17  __u16 tt;
18  __u8 r;
19 } __attribute__ ((packed));
20 
21 struct vtoc_cchhb
22 {
23  __u16 cc;
24  __u16 hh;
25  __u8 b;
26 } __attribute__ ((packed));
27 
28 struct vtoc_cchh
29 {
30  __u16 cc;
31  __u16 hh;
32 } __attribute__ ((packed));
33 
34 struct vtoc_labeldate
35 {
36  __u8 year;
37  __u16 day;
38 } __attribute__ ((packed));
39 
40 struct vtoc_volume_label_cdl
41 {
42  char volkey[4]; /* volume key = volume label */
43  char vollbl[4]; /* volume label */
44  char volid[6]; /* volume identifier */
45  __u8 security; /* security byte */
46  struct vtoc_cchhb vtoc; /* VTOC address */
47  char res1[5]; /* reserved */
48  char cisize[4]; /* CI-size for FBA,... */
49  /* ...blanks for CKD */
50  char blkperci[4]; /* no of blocks per CI (FBA), blanks for CKD */
51  char labperci[4]; /* no of labels per CI (FBA), blanks for CKD */
52  char res2[4]; /* reserved */
53  char lvtoc[14]; /* owner code for LVTOC */
54  char res3[29]; /* reserved */
55 } __attribute__ ((packed));
56 
57 struct vtoc_volume_label_ldl {
58  char vollbl[4]; /* volume label */
59  char volid[6]; /* volume identifier */
60  char res3[69]; /* reserved */
61  char ldl_version; /* version number, valid for ldl format */
62  __u64 formatted_blocks; /* valid when ldl_version >= f2 */
63 } __attribute__ ((packed));
64 
65 struct vtoc_extent
66 {
67  __u8 typeind; /* extent type indicator */
68  __u8 seqno; /* extent sequence number */
69  struct vtoc_cchh llimit; /* starting point of this extent */
70  struct vtoc_cchh ulimit; /* ending point of this extent */
71 } __attribute__ ((packed));
72 
73 struct vtoc_dev_const
74 {
75  __u16 DS4DSCYL; /* number of logical cyls */
76  __u16 DS4DSTRK; /* number of tracks in a logical cylinder */
77  __u16 DS4DEVTK; /* device track length */
78  __u8 DS4DEVI; /* non-last keyed record overhead */
79  __u8 DS4DEVL; /* last keyed record overhead */
80  __u8 DS4DEVK; /* non-keyed record overhead differential */
81  __u8 DS4DEVFG; /* flag byte */
82  __u16 DS4DEVTL; /* device tolerance */
83  __u8 DS4DEVDT; /* number of DSCB's per track */
84  __u8 DS4DEVDB; /* number of directory blocks per track */
85 } __attribute__ ((packed));
86 
87 struct vtoc_format1_label
88 {
89  char DS1DSNAM[44]; /* data set name */
90  __u8 DS1FMTID; /* format identifier */
91  char DS1DSSN[6]; /* data set serial number */
92  __u16 DS1VOLSQ; /* volume sequence number */
93  struct vtoc_labeldate DS1CREDT; /* creation date: ydd */
94  struct vtoc_labeldate DS1EXPDT; /* expiration date */
95  __u8 DS1NOEPV; /* number of extents on volume */
96  __u8 DS1NOBDB; /* no. of bytes used in last direction blk */
97  __u8 DS1FLAG1; /* flag 1 */
98  char DS1SYSCD[13]; /* system code */
99  struct vtoc_labeldate DS1REFD; /* date last referenced */
100  __u8 DS1SMSFG; /* system managed storage indicators */
101  __u8 DS1SCXTF; /* sec. space extension flag byte */
102  __u16 DS1SCXTV; /* secondary space extension value */
103  __u8 DS1DSRG1; /* data set organisation byte 1 */
104  __u8 DS1DSRG2; /* data set organisation byte 2 */
105  __u8 DS1RECFM; /* record format */
106  __u8 DS1OPTCD; /* option code */
107  __u16 DS1BLKL; /* block length */
108  __u16 DS1LRECL; /* record length */
109  __u8 DS1KEYL; /* key length */
110  __u16 DS1RKP; /* relative key position */
111  __u8 DS1DSIND; /* data set indicators */
112  __u8 DS1SCAL1; /* secondary allocation flag byte */
113  char DS1SCAL3[3]; /* secondary allocation quantity */
114  struct vtoc_ttr DS1LSTAR; /* last used track and block on track */
115  __u16 DS1TRBAL; /* space remaining on last used track */
116  __u16 res1; /* reserved */
117  struct vtoc_extent DS1EXT1; /* first extent description */
118  struct vtoc_extent DS1EXT2; /* second extent description */
119  struct vtoc_extent DS1EXT3; /* third extent description */
120  struct vtoc_cchhb DS1PTRDS; /* possible pointer to f2 or f3 DSCB */
121 } __attribute__ ((packed));
122 
123 struct vtoc_format4_label
124 {
125  char DS4KEYCD[44]; /* key code for VTOC labels: 44 times 0x04 */
126  __u8 DS4IDFMT; /* format identifier */
127  struct vtoc_cchhb DS4HPCHR; /* highest address of a format 1 DSCB */
128  __u16 DS4DSREC; /* number of available DSCB's */
129  struct vtoc_cchh DS4HCCHH; /* CCHH of next available alternate track */
130  __u16 DS4NOATK; /* number of remaining alternate tracks */
131  __u8 DS4VTOCI; /* VTOC indicators */
132  __u8 DS4NOEXT; /* number of extents in VTOC */
133  __u8 DS4SMSFG; /* system managed storage indicators */
134  __u8 DS4DEVAC; /* number of alternate cylinders.
135  * Subtract from first two bytes of
136  * DS4DEVSZ to get number of usable
137  * cylinders. can be zero. valid
138  * only if DS4DEVAV on. */
139  struct vtoc_dev_const DS4DEVCT; /* device constants */
140  char DS4AMTIM[8]; /* VSAM time stamp */
141  char DS4AMCAT[3]; /* VSAM catalog indicator */
142  char DS4R2TIM[8]; /* VSAM volume/catalog match time stamp */
143  char res1[5]; /* reserved */
144  char DS4F6PTR[5]; /* pointer to first format 6 DSCB */
145  struct vtoc_extent DS4VTOCE; /* VTOC extent description */
146  char res2[10]; /* reserved */
147  __u8 DS4EFLVL; /* extended free-space management level */
148  struct vtoc_cchhb DS4EFPTR; /* pointer to extended free-space info */
149  char res3; /* reserved */
150  __u32 DS4DCYL; /* number of logical cyls */
151  char res4[2]; /* reserved */
152  __u8 DS4DEVF2; /* device flags */
153  char res5; /* reserved */
154 } __attribute__ ((packed));
155 
156 struct vtoc_ds5ext
157 {
158  __u16 t; /* RTA of the first track of free extent */
159  __u16 fc; /* number of whole cylinders in free ext. */
160  __u8 ft; /* number of remaining free tracks */
161 } __attribute__ ((packed));
162 
163 struct vtoc_format5_label
164 {
165  char DS5KEYID[4]; /* key identifier */
166  struct vtoc_ds5ext DS5AVEXT; /* first available (free-space) extent. */
167  struct vtoc_ds5ext DS5EXTAV[7]; /* seven available extents */
168  __u8 DS5FMTID; /* format identifier */
169  struct vtoc_ds5ext DS5MAVET[18]; /* eighteen available extents */
170  struct vtoc_cchhb DS5PTRDS; /* pointer to next format5 DSCB */
171 } __attribute__ ((packed));
172 
173 struct vtoc_ds7ext
174 {
175  __u32 a; /* starting RTA value */
176  __u32 b; /* ending RTA value + 1 */
177 } __attribute__ ((packed));
178 
179 struct vtoc_format7_label
180 {
181  char DS7KEYID[4]; /* key identifier */
182  struct vtoc_ds7ext DS7EXTNT[5]; /* space for 5 extent descriptions */
183  __u8 DS7FMTID; /* format identifier */
184  struct vtoc_ds7ext DS7ADEXT[11]; /* space for 11 extent descriptions */
185  char res1[2]; /* reserved */
186  struct vtoc_cchhb DS7PTRDS; /* pointer to next FMT7 DSCB */
187 } __attribute__ ((packed));
188 
189 struct vtoc_cms_label {
190  __u8 label_id[4]; /* Label identifier */
191  __u8 vol_id[6]; /* Volid */
192  __u16 version_id; /* Version identifier */
193  __u32 block_size; /* Disk block size */
194  __u32 origin_ptr; /* Disk origin pointer */
195  __u32 usable_count; /* Number of usable cylinders/blocks */
196  __u32 formatted_count; /* Maximum number of formatted cylinders/
197  * blocks */
198  __u32 block_count; /* Disk size in CMS blocks */
199  __u32 used_count; /* Number of CMS blocks in use */
200  __u32 fst_size; /* File Status Table (FST) size */
201  __u32 fst_count; /* Number of FSTs per CMS block */
202  __u8 format_date[6]; /* Disk FORMAT date */
203  __u8 reserved1[2];
204  __u32 disk_offset; /* Disk offset when reserved*/
205  __u32 map_block; /* Allocation Map Block with next hole */
206  __u32 hblk_disp; /* Displacement into HBLK data of next hole */
207  __u32 user_disp; /* Displacement into user part of Allocation
208  * map */
209  __u8 reserved2[4];
210  __u8 segment_name[8]; /* Name of shared segment */
211 } __attribute__ ((packed));
212 
213 #endif /* _ASM_S390_VTOC_H */
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