This source file includes following definitions.
- end_request
1 #ifndef _BLK_H
2 #define _BLK_H
3
4 #include <linux/major.h>
5 #include <linux/sched.h>
6 #include <linux/locks.h>
7 #include <linux/genhd.h>
8
9
10
11
12
13
14
15
16
17
18
19 #define NR_REQUEST 64
20
21
22
23
24
25
26
27 struct request {
28 int dev;
29 int cmd;
30 int errors;
31 unsigned long sector;
32 unsigned long nr_sectors;
33 unsigned long current_nr_sectors;
34 char * buffer;
35 struct task_struct * waiting;
36 struct buffer_head * bh;
37 struct buffer_head * bhtail;
38 struct request * next;
39 };
40
41
42
43
44
45
46 #define IN_ORDER(s1,s2) \
47 ((s1)->cmd < (s2)->cmd || ((s1)->cmd == (s2)->cmd && \
48 ((s1)->dev < (s2)->dev || (((s1)->dev == (s2)->dev && \
49 (s1)->sector < (s2)->sector)))))
50
51 struct blk_dev_struct {
52 void (*request_fn)(void);
53 struct request * current_request;
54 };
55
56
57 struct sec_size {
58 unsigned block_size;
59 unsigned block_size_bits;
60 };
61
62
63
64
65
66 #define SECTOR_MASK (blksize_size[MAJOR_NR] && \
67 blksize_size[MAJOR_NR][MINOR(CURRENT->dev)] ? \
68 ((blksize_size[MAJOR_NR][MINOR(CURRENT->dev)] >> 9) - 1) : \
69 ((BLOCK_SIZE >> 9) - 1))
70
71 #define SUBSECTOR(block) (CURRENT->current_nr_sectors > 0)
72
73 extern struct sec_size * blk_sec[MAX_BLKDEV];
74 extern struct blk_dev_struct blk_dev[MAX_BLKDEV];
75 extern struct wait_queue * wait_for_request;
76 extern void resetup_one_dev(struct gendisk *dev, int drive);
77
78 extern int * blk_size[MAX_BLKDEV];
79
80 extern int * blksize_size[MAX_BLKDEV];
81
82 extern unsigned long hd_init(unsigned long mem_start, unsigned long mem_end);
83 extern unsigned long cdu31a_init(unsigned long mem_start, unsigned long mem_end);
84 extern unsigned long mcd_init(unsigned long mem_start, unsigned long mem_end);
85 #ifdef CONFIG_SBPCD
86 extern unsigned long sbpcd_init(unsigned long, unsigned long);
87 #endif CONFIG_SBPCD
88 extern int is_read_only(int dev);
89 extern void set_device_ro(int dev,int flag);
90
91 extern void rd_load(void);
92 extern long rd_init(long mem_start, int length);
93 extern int ramdisk_size;
94
95 extern unsigned long xd_init(unsigned long mem_start, unsigned long mem_end);
96
97 #define RO_IOCTLS(dev,where) \
98 case BLKROSET: if (!suser()) return -EPERM; \
99 set_device_ro((dev),get_fs_long((long *) (where))); return 0; \
100 case BLKROGET: { int __err = verify_area(VERIFY_WRITE, (void *) (where), sizeof(long)); \
101 if (!__err) put_fs_long(is_read_only(dev),(long *) (where)); return __err; }
102
103 #ifdef MAJOR_NR
104
105
106
107
108
109
110 #if (MAJOR_NR == MEM_MAJOR)
111
112
113 #define DEVICE_NAME "ramdisk"
114 #define DEVICE_REQUEST do_rd_request
115 #define DEVICE_NR(device) ((device) & 7)
116 #define DEVICE_ON(device)
117 #define DEVICE_OFF(device)
118
119 #elif (MAJOR_NR == FLOPPY_MAJOR)
120
121 static void floppy_on(unsigned int nr);
122 static void floppy_off(unsigned int nr);
123
124 #define DEVICE_NAME "floppy"
125 #define DEVICE_INTR do_floppy
126 #define DEVICE_REQUEST do_fd_request
127 #define DEVICE_NR(device) ((device) & 3)
128 #define DEVICE_ON(device) floppy_on(DEVICE_NR(device))
129 #define DEVICE_OFF(device) floppy_off(DEVICE_NR(device))
130
131 #elif (MAJOR_NR == HD_MAJOR)
132
133
134 #define DEVICE_NAME "harddisk"
135 #define DEVICE_INTR do_hd
136 #define DEVICE_TIMEOUT HD_TIMER
137 #define TIMEOUT_VALUE 600
138 #define DEVICE_REQUEST do_hd_request
139 #define DEVICE_NR(device) (MINOR(device)>>6)
140 #define DEVICE_ON(device)
141 #define DEVICE_OFF(device)
142
143 #elif (MAJOR_NR == SCSI_DISK_MAJOR)
144
145 #define DEVICE_NAME "scsidisk"
146 #define DEVICE_INTR do_sd
147 #define TIMEOUT_VALUE 200
148 #define DEVICE_REQUEST do_sd_request
149 #define DEVICE_NR(device) (MINOR(device) >> 4)
150 #define DEVICE_ON(device)
151 #define DEVICE_OFF(device)
152
153 #elif (MAJOR_NR == SCSI_TAPE_MAJOR)
154
155 #define DEVICE_NAME "scsitape"
156 #define DEVICE_INTR do_st
157 #define DEVICE_NR(device) (MINOR(device))
158 #define DEVICE_ON(device)
159 #define DEVICE_OFF(device)
160
161 #elif (MAJOR_NR == SCSI_CDROM_MAJOR)
162
163 #define DEVICE_NAME "CD-ROM"
164 #define DEVICE_INTR do_sr
165 #define DEVICE_REQUEST do_sr_request
166 #define DEVICE_NR(device) (MINOR(device))
167 #define DEVICE_ON(device)
168 #define DEVICE_OFF(device)
169
170 #elif (MAJOR_NR == XT_DISK_MAJOR)
171
172 #define DEVICE_NAME "xt disk"
173 #define DEVICE_REQUEST do_xd_request
174 #define DEVICE_NR(device) (MINOR(device) >> 6)
175 #define DEVICE_ON(device)
176 #define DEVICE_OFF(device)
177
178 #elif (MAJOR_NR == CDU31A_CDROM_MAJOR)
179
180 #define DEVICE_NAME "CDU31A"
181 #define DEVICE_REQUEST do_cdu31a_request
182 #define DEVICE_NR(device) (MINOR(device))
183 #define DEVICE_ON(device)
184 #define DEVICE_OFF(device)
185
186 #elif (MAJOR_NR == MITSUMI_CDROM_MAJOR)
187
188 #define DEVICE_NAME "Mitsumi CD-ROM"
189
190 #define DEVICE_REQUEST do_mcd_request
191 #define DEVICE_NR(device) (MINOR(device))
192 #define DEVICE_ON(device)
193 #define DEVICE_OFF(device)
194
195 #elif (MAJOR_NR == MATSUSHITA_CDROM_MAJOR)
196
197 #define DEVICE_NAME "Matsushita CD-ROM"
198 #define DEVICE_REQUEST do_sbpcd_request
199 #define DEVICE_NR(device) (MINOR(device))
200 #define DEVICE_ON(device)
201 #define DEVICE_OFF(device)
202
203 #else
204
205 #error "unknown blk device"
206
207 #endif
208
209 #if (MAJOR_NR != SCSI_TAPE_MAJOR)
210
211 #ifndef CURRENT
212 #define CURRENT (blk_dev[MAJOR_NR].current_request)
213 #endif
214
215 #define CURRENT_DEV DEVICE_NR(CURRENT->dev)
216
217 #ifdef DEVICE_INTR
218 void (*DEVICE_INTR)(void) = NULL;
219 #endif
220 #ifdef DEVICE_TIMEOUT
221
222 #define SET_TIMER \
223 ((timer_table[DEVICE_TIMEOUT].expires = jiffies + TIMEOUT_VALUE), \
224 (timer_active |= 1<<DEVICE_TIMEOUT))
225
226 #define CLEAR_TIMER \
227 timer_active &= ~(1<<DEVICE_TIMEOUT)
228
229 #define SET_INTR(x) \
230 if ((DEVICE_INTR = (x)) != NULL) \
231 SET_TIMER; \
232 else \
233 CLEAR_TIMER;
234
235 #else
236
237 #define SET_INTR(x) (DEVICE_INTR = (x))
238
239 #endif
240 static void (DEVICE_REQUEST)(void);
241
242
243
244 #if ! SCSI_MAJOR(MAJOR_NR)
245
246 static void end_request(int uptodate)
247 {
248 struct request * req;
249 struct buffer_head * bh;
250 struct task_struct * p;
251
252 req = CURRENT;
253 req->errors = 0;
254 if (!uptodate) {
255 printk(DEVICE_NAME " I/O error\n");
256 printk("dev %04lX, sector %lu\n",
257 (unsigned long)req->dev, req->sector);
258 req->nr_sectors--;
259 req->nr_sectors &= ~SECTOR_MASK;
260 req->sector += (BLOCK_SIZE / 512);
261 req->sector &= ~SECTOR_MASK;
262 }
263
264 if ((bh = req->bh) != NULL) {
265 req->bh = bh->b_reqnext;
266 bh->b_reqnext = NULL;
267 bh->b_uptodate = uptodate;
268 unlock_buffer(bh);
269 if ((bh = req->bh) != NULL) {
270 req->current_nr_sectors = bh->b_size >> 9;
271 if (req->nr_sectors < req->current_nr_sectors) {
272 req->nr_sectors = req->current_nr_sectors;
273 printk("end_request: buffer-list destroyed\n");
274 }
275 req->buffer = bh->b_data;
276 return;
277 }
278 }
279 DEVICE_OFF(req->dev);
280 CURRENT = req->next;
281 if ((p = req->waiting) != NULL) {
282 req->waiting = NULL;
283 p->state = TASK_RUNNING;
284 if (p->counter > current->counter)
285 need_resched = 1;
286 }
287 req->dev = -1;
288 wake_up(&wait_for_request);
289 }
290 #endif
291
292 #ifdef DEVICE_INTR
293 #define CLEAR_INTR SET_INTR(NULL)
294 #else
295 #define CLEAR_INTR
296 #endif
297
298 #define INIT_REQUEST \
299 if (!CURRENT) {\
300 CLEAR_INTR; \
301 return; \
302 } \
303 if (MAJOR(CURRENT->dev) != MAJOR_NR) \
304 panic(DEVICE_NAME ": request list destroyed"); \
305 if (CURRENT->bh) { \
306 if (!CURRENT->bh->b_lock) \
307 panic(DEVICE_NAME ": block not locked"); \
308 }
309
310 #endif
311
312 #endif
313 #endif