fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / drivers / scsi / st.h
blob6c8075712974af0db0da977dbba3b47b6cb35f7d
2 #ifndef _ST_H
3 #define _ST_H
5 #include <linux/completion.h>
6 #include <linux/mutex.h>
7 #include <linux/kref.h>
8 #include <scsi/scsi_cmnd.h>
10 /* Descriptor for analyzed sense data */
11 struct st_cmdstatus {
12 int midlevel_result;
13 struct scsi_sense_hdr sense_hdr;
14 int have_sense;
15 u64 uremainder64;
16 u8 flags;
17 u8 remainder_valid;
18 u8 fixed_format;
19 u8 deferred;
22 struct scsi_tape;
24 /* scsi tape command */
25 struct st_request {
26 unsigned char cmd[MAX_COMMAND_SIZE];
27 unsigned char sense[SCSI_SENSE_BUFFERSIZE];
28 int result;
29 struct scsi_tape *stp;
30 struct completion *waiting;
33 /* The tape buffer descriptor. */
34 struct st_buffer {
35 unsigned char dma; /* DMA-able buffer */
36 unsigned char do_dio; /* direct i/o set up? */
37 int buffer_size;
38 int buffer_blocks;
39 int buffer_bytes;
40 int read_pointer;
41 int writing;
42 int syscall_result;
43 struct st_request *last_SRpnt;
44 struct st_cmdstatus cmdstat;
45 unsigned char *b_data;
46 unsigned short use_sg; /* zero or max number of s/g segments for this adapter */
47 unsigned short sg_segs; /* number of segments in s/g list */
48 unsigned short orig_frp_segs; /* number of segments allocated at first try */
49 unsigned short frp_segs; /* number of buffer segments */
50 unsigned int frp_sg_current; /* driver buffer length currently in s/g list */
51 struct st_buf_fragment *frp; /* the allocated buffer fragment list */
52 struct scatterlist sg[1]; /* MUST BE last item */
55 /* The tape buffer fragment descriptor */
56 struct st_buf_fragment {
57 struct page *page;
58 unsigned int length;
61 /* The tape mode definition */
62 struct st_modedef {
63 unsigned char defined;
64 unsigned char sysv; /* SYS V semantics? */
65 unsigned char do_async_writes;
66 unsigned char do_buffer_writes;
67 unsigned char do_read_ahead;
68 unsigned char defaults_for_writes;
69 unsigned char default_compression; /* 0 = don't touch, etc */
70 short default_density; /* Forced density, -1 = no value */
71 int default_blksize; /* Forced blocksize, -1 = no value */
72 struct cdev *cdevs[2]; /* Auto-rewind and non-rewind devices */
75 /* Number of modes can be changed by changing ST_NBR_MODE_BITS. The maximum
76 number of modes is 16 (ST_NBR_MODE_BITS 4) */
77 #define ST_NBR_MODE_BITS 2
78 #define ST_NBR_MODES (1 << ST_NBR_MODE_BITS)
79 #define ST_MODE_SHIFT (7 - ST_NBR_MODE_BITS)
80 #define ST_MODE_MASK ((ST_NBR_MODES - 1) << ST_MODE_SHIFT)
82 #define ST_MAX_TAPES 128
83 #define ST_MAX_TAPE_ENTRIES (ST_MAX_TAPES << (ST_NBR_MODE_BITS + 1))
85 /* The status related to each partition */
86 struct st_partstat {
87 unsigned char rw;
88 unsigned char eof;
89 unsigned char at_sm;
90 unsigned char last_block_valid;
91 u32 last_block_visited;
92 int drv_block; /* The block where the drive head is */
93 int drv_file;
96 #define ST_NBR_PARTITIONS 4
98 /* The tape drive descriptor */
99 struct scsi_tape {
100 struct scsi_driver *driver;
101 struct scsi_device *device;
102 struct mutex lock; /* For serialization */
103 struct completion wait; /* For SCSI commands */
104 struct st_buffer *buffer;
106 /* Drive characteristics */
107 unsigned char omit_blklims;
108 unsigned char do_auto_lock;
109 unsigned char can_bsr;
110 unsigned char can_partitions;
111 unsigned char two_fm;
112 unsigned char fast_mteom;
113 unsigned char immediate;
114 unsigned char restr_dma;
115 unsigned char scsi2_logical;
116 unsigned char default_drvbuffer; /* 0xff = don't touch, value 3 bits */
117 unsigned char cln_mode; /* 0 = none, otherwise sense byte nbr */
118 unsigned char cln_sense_value;
119 unsigned char cln_sense_mask;
120 unsigned char use_pf; /* Set Page Format bit in all mode selects? */
121 unsigned char try_dio; /* try direct i/o in general? */
122 unsigned char try_dio_now; /* try direct i/o before next close? */
123 unsigned char c_algo; /* compression algorithm */
124 unsigned char pos_unknown; /* after reset position unknown */
125 int tape_type;
126 int long_timeout; /* timeout for commands known to take long time */
128 unsigned long max_pfn; /* the maximum page number reachable by the HBA */
130 /* Mode characteristics */
131 struct st_modedef modes[ST_NBR_MODES];
132 int current_mode;
134 /* Status variables */
135 int partition;
136 int new_partition;
137 int nbr_partitions; /* zero until partition support enabled */
138 struct st_partstat ps[ST_NBR_PARTITIONS];
139 unsigned char dirty;
140 unsigned char ready;
141 unsigned char write_prot;
142 unsigned char drv_write_prot;
143 unsigned char in_use;
144 unsigned char blksize_changed;
145 unsigned char density_changed;
146 unsigned char compression_changed;
147 unsigned char drv_buffer;
148 unsigned char density;
149 unsigned char door_locked;
150 unsigned char autorew_dev; /* auto-rewind device */
151 unsigned char rew_at_close; /* rewind necessary at close */
152 unsigned char inited;
153 unsigned char cleaning_req; /* cleaning requested? */
154 int block_size;
155 int min_block;
156 int max_block;
157 int recover_count; /* From tape opening */
158 int recover_reg; /* From last status call */
160 #if DEBUG
161 unsigned char write_pending;
162 int nbr_finished;
163 int nbr_waits;
164 int nbr_requests;
165 int nbr_dio;
166 int nbr_pages;
167 int nbr_combinable;
168 unsigned char last_cmnd[6];
169 unsigned char last_sense[16];
170 #endif
171 struct gendisk *disk;
172 struct kref kref;
175 /* Bit masks for use_pf */
176 #define USE_PF 1
177 #define PF_TESTED 2
179 /* Values of eof */
180 #define ST_NOEOF 0
181 #define ST_FM_HIT 1
182 #define ST_FM 2
183 #define ST_EOM_OK 3
184 #define ST_EOM_ERROR 4
185 #define ST_EOD_1 5
186 #define ST_EOD_2 6
187 #define ST_EOD 7
188 /* EOD hit while reading => ST_EOD_1 => return zero => ST_EOD_2 =>
189 return zero => ST_EOD, return ENOSPC */
190 /* When writing: ST_EOM_OK == early warning found, write OK
191 ST_EOD_1 == allow trying new write after early warning
192 ST_EOM_ERROR == early warning found, not able to write all */
194 /* Values of rw */
195 #define ST_IDLE 0
196 #define ST_READING 1
197 #define ST_WRITING 2
199 /* Values of ready state */
200 #define ST_READY 0
201 #define ST_NOT_READY 1
202 #define ST_NO_TAPE 2
204 /* Values for door lock state */
205 #define ST_UNLOCKED 0
206 #define ST_LOCKED_EXPLICIT 1
207 #define ST_LOCKED_AUTO 2
208 #define ST_LOCK_FAILS 3
210 /* Positioning SCSI-commands for Tandberg, etc. drives */
211 #define QFA_REQUEST_BLOCK 0x02
212 #define QFA_SEEK_BLOCK 0x0c
214 /* Setting the binary options */
215 #define ST_DONT_TOUCH 0
216 #define ST_NO 1
217 #define ST_YES 2
219 #define EXTENDED_SENSE_START 18
221 /* Masks for some conditions in the sense data */
222 #define SENSE_FMK 0x80
223 #define SENSE_EOM 0x40
224 #define SENSE_ILI 0x20
226 #endif