2 * File...........: linux/drivers/s390/block/dasd.c
3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
4 * Bugreports.to..: <Linux390@de.ibm.com>
5 * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
7 * This file is the interface of the DASD device driver, which is exported to user space
8 * any future changes wrt the API will result in a change of the APIVERSION reported
9 * to userspace by the DASDAPIVER-ioctl
11 * History of changes (starts July 2000)
12 * 05/04/01 created by moving the kernel interface to drivers/s390/block/dasd_int.h
17 #include <linux/ioctl.h>
19 #define DASD_IOCTL_LETTER 'D'
21 #if (DASD_API_VERSION == 0)
23 #define DASD_PARTN_BITS 2
26 * struct profile_info_t
27 * holds the profinling information
29 typedef struct dasd_profile_info_t {
30 unsigned int dasd_io_reqs; /* number of requests processed at all */
31 unsigned int dasd_io_sects; /* number of sectors processed at all */
32 unsigned int dasd_io_secs[32]; /* histogram of request's sizes */
33 unsigned int dasd_io_times[32]; /* histogram of requests's times */
34 unsigned int dasd_io_timps[32]; /* histogram of requests's times per sector */
35 unsigned int dasd_io_time1[32]; /* histogram of time from build to start */
36 unsigned int dasd_io_time2[32]; /* histogram of time from start to irq */
37 unsigned int dasd_io_time2ps[32]; /* histogram of time from start to irq */
38 unsigned int dasd_io_time3[32]; /* histogram of time from irq to end */
39 unsigned int dasd_io_nr_req[32]; /* histogram of # of requests in chanq */
40 } dasd_profile_info_t;
43 * struct format_data_t
44 * represents all data necessary to format a dasd
46 typedef struct format_data_t {
47 int start_unit; /* from track */
48 int stop_unit; /* to track */
49 int blksize; /* sectorsize */
54 * values to be used for format_data_t.intensity
56 * 1/9: also write record zero
57 * 3/11: also write home address
58 * 4/12: invalidate track
60 #define DASD_FMT_INT_FMT_R0 1 /* write record zero */
61 #define DASD_FMT_INT_FMT_HA 2 /* write home address, also set FMT_R0 ! */
62 #define DASD_FMT_INT_INVAL 4 /* invalidate tracks */
63 #define DASD_FMT_INT_COMPAT 8 /* use OS/390 compatible disk layout */
66 * struct dasd_information_t
67 * represents any data about the data, which is visible to userspace
69 typedef struct dasd_information_t {
70 unsigned int devno; /* S/390 devno */
71 unsigned int real_devno; /* for aliases */
72 unsigned int schid; /* S/390 subchannel identifier */
73 unsigned int cu_type : 16; /* from SenseID */
74 unsigned int cu_model : 8; /* from SenseID */
75 unsigned int dev_type : 16; /* from SenseID */
76 unsigned int dev_model : 8; /* from SenseID */
77 unsigned int open_count;
78 unsigned int req_queue_len;
79 unsigned int chanq_len;
80 char type[4]; /* from discipline.name, 'none' for unknown */
81 unsigned int status; /* current device level */
82 unsigned int label_block; /* where to find the VOLSER */
83 unsigned int FBA_layout; /* fixed block size (like AIXVOL) */
84 unsigned int characteristics_size;
85 unsigned int confdata_size;
86 char characteristics[64]; /* from read_device_characteristics */
87 char configuration_data[256]; /* from read_configuration_data */
90 /* Disable the volume (for Linux) */
91 #define BIODASDDISABLE _IO(DASD_IOCTL_LETTER,0)
92 /* Enable the volume (for Linux) */
93 #define BIODASDENABLE _IO(DASD_IOCTL_LETTER,1)
94 /* Issue a reserve/release command, rsp. */
95 #define BIODASDRSRV _IO(DASD_IOCTL_LETTER,2) /* reserve */
96 #define BIODASDRLSE _IO(DASD_IOCTL_LETTER,3) /* release */
97 #define BIODASDSLCK _IO(DASD_IOCTL_LETTER,4) /* steal lock */
98 /* reset profiling information of a device */
99 #define BIODASDPRRST _IO(DASD_IOCTL_LETTER,5)
100 /* retrieve API version number */
101 #define DASDAPIVER _IOR(DASD_IOCTL_LETTER,0,int)
102 /* Get information on a dasd device */
103 #define BIODASDINFO _IOR(DASD_IOCTL_LETTER,1,dasd_information_t)
104 /* retrieve profiling information of a device */
105 #define BIODASDPRRD _IOR(DASD_IOCTL_LETTER,2,dasd_profile_info_t)
106 /* #define BIODASDFORMAT _IOW(IOCTL_LETTER,0,format_data_t) , deprecated */
107 #define BIODASDFMT _IOW(DASD_IOCTL_LETTER,1,format_data_t)
108 #endif /* DASD_API_VERSION */
112 * Overrides for Emacs so that we follow Linus's tabbing style.
113 * Emacs will notice this stuff at the end of the file and automatically
114 * adjust the settings for this buffer only. This must remain at the end
116 * ---------------------------------------------------------------------------
119 * c-brace-imaginary-offset: 0
121 * c-argdecl-indent: 4
123 * c-continued-statement-offset: 4
124 * c-continued-brace-offset: 0
125 * indent-tabs-mode: nil