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Commit | Line | Data |
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6c29256c | 1 | /* |
f88f0bdf | 2 | * Copyright (C) 2015-2016 Anton Ivanov (aivanov@brocade.com) |
1da177e4 LT |
3 | * Copyright (C) 2000 Jeff Dike (jdike@karaya.com) |
4 | * Licensed under the GPL | |
5 | */ | |
6 | ||
7 | /* 2001-09-28...2002-04-17 | |
8 | * Partition stuff by James_McMechan@hotmail.com | |
9 | * old style ubd by setting UBD_SHIFT to 0 | |
10 | * 2002-09-27...2002-10-18 massive tinkering for 2.5 | |
11 | * partitions have changed in 2.5 | |
12 | * 2003-01-29 more tinkering for 2.5.59-1 | |
13 | * This should now address the sysfs problems and has | |
14 | * the symlink for devfs to allow for booting with | |
15 | * the common /dev/ubd/discX/... names rather than | |
16 | * only /dev/ubdN/discN this version also has lots of | |
17 | * clean ups preparing for ubd-many. | |
18 | * James McMechan | |
19 | */ | |
20 | ||
1da177e4 LT |
21 | #define UBD_SHIFT 4 |
22 | ||
8ea3c06a AV |
23 | #include <linux/module.h> |
24 | #include <linux/init.h> | |
25 | #include <linux/blkdev.h> | |
26 | #include <linux/ata.h> | |
27 | #include <linux/hdreg.h> | |
28 | #include <linux/cdrom.h> | |
29 | #include <linux/proc_fs.h> | |
30 | #include <linux/seq_file.h> | |
31 | #include <linux/ctype.h> | |
32 | #include <linux/slab.h> | |
33 | #include <linux/vmalloc.h> | |
34 | #include <linux/platform_device.h> | |
35 | #include <linux/scatterlist.h> | |
36 | #include <asm/tlbflush.h> | |
37185b33 | 37 | #include <kern_util.h> |
1da177e4 | 38 | #include "mconsole_kern.h" |
37185b33 AV |
39 | #include <init.h> |
40 | #include <irq_kern.h> | |
8ea3c06a | 41 | #include "ubd.h" |
37185b33 | 42 | #include <os.h> |
1da177e4 LT |
43 | #include "cow.h" |
44 | ||
805f11a0 | 45 | enum ubd_req { UBD_READ, UBD_WRITE, UBD_FLUSH }; |
1da177e4 LT |
46 | |
47 | struct io_thread_req { | |
62f96cb0 | 48 | struct request *req; |
91acb21f | 49 | enum ubd_req op; |
1da177e4 LT |
50 | int fds[2]; |
51 | unsigned long offsets[2]; | |
52 | unsigned long long offset; | |
53 | unsigned long length; | |
54 | char *buffer; | |
55 | int sectorsize; | |
91acb21f JD |
56 | unsigned long sector_mask; |
57 | unsigned long long cow_offset; | |
58 | unsigned long bitmap_words[2]; | |
1da177e4 LT |
59 | int error; |
60 | }; | |
61 | ||
f88f0bdf AI |
62 | |
63 | static struct io_thread_req * (*irq_req_buffer)[]; | |
64 | static struct io_thread_req *irq_remainder; | |
65 | static int irq_remainder_size; | |
66 | ||
67 | static struct io_thread_req * (*io_req_buffer)[]; | |
68 | static struct io_thread_req *io_remainder; | |
69 | static int io_remainder_size; | |
70 | ||
71 | ||
72 | ||
91acb21f | 73 | static inline int ubd_test_bit(__u64 bit, unsigned char *data) |
1da177e4 LT |
74 | { |
75 | __u64 n; | |
76 | int bits, off; | |
77 | ||
91acb21f | 78 | bits = sizeof(data[0]) * 8; |
1da177e4 LT |
79 | n = bit / bits; |
80 | off = bit % bits; | |
dc764e50 | 81 | return (data[n] & (1 << off)) != 0; |
1da177e4 LT |
82 | } |
83 | ||
91acb21f | 84 | static inline void ubd_set_bit(__u64 bit, unsigned char *data) |
1da177e4 LT |
85 | { |
86 | __u64 n; | |
87 | int bits, off; | |
88 | ||
91acb21f | 89 | bits = sizeof(data[0]) * 8; |
1da177e4 LT |
90 | n = bit / bits; |
91 | off = bit % bits; | |
91acb21f | 92 | data[n] |= (1 << off); |
1da177e4 LT |
93 | } |
94 | /*End stuff from ubd_user.h*/ | |
95 | ||
96 | #define DRIVER_NAME "uml-blkdev" | |
97 | ||
d7fb2c38 | 98 | static DEFINE_MUTEX(ubd_lock); |
9a181c58 | 99 | static DEFINE_MUTEX(ubd_mutex); /* replaces BKL, might not be needed */ |
1da177e4 | 100 | |
a625c998 | 101 | static int ubd_open(struct block_device *bdev, fmode_t mode); |
db2a144b | 102 | static void ubd_release(struct gendisk *disk, fmode_t mode); |
a625c998 | 103 | static int ubd_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 | 104 | unsigned int cmd, unsigned long arg); |
a885c8c4 | 105 | static int ubd_getgeo(struct block_device *bdev, struct hd_geometry *geo); |
1da177e4 | 106 | |
97d88ac8 | 107 | #define MAX_DEV (16) |
1da177e4 | 108 | |
83d5cde4 | 109 | static const struct block_device_operations ubd_blops = { |
1da177e4 | 110 | .owner = THIS_MODULE, |
a625c998 AV |
111 | .open = ubd_open, |
112 | .release = ubd_release, | |
113 | .ioctl = ubd_ioctl, | |
a885c8c4 | 114 | .getgeo = ubd_getgeo, |
1da177e4 LT |
115 | }; |
116 | ||
1da177e4 | 117 | /* Protected by ubd_lock */ |
792dd4fc | 118 | static int fake_major = UBD_MAJOR; |
1da177e4 LT |
119 | static struct gendisk *ubd_gendisk[MAX_DEV]; |
120 | static struct gendisk *fake_gendisk[MAX_DEV]; | |
6c29256c | 121 | |
1da177e4 LT |
122 | #ifdef CONFIG_BLK_DEV_UBD_SYNC |
123 | #define OPEN_FLAGS ((struct openflags) { .r = 1, .w = 1, .s = 1, .c = 0, \ | |
124 | .cl = 1 }) | |
125 | #else | |
126 | #define OPEN_FLAGS ((struct openflags) { .r = 1, .w = 1, .s = 0, .c = 0, \ | |
127 | .cl = 1 }) | |
128 | #endif | |
1da177e4 LT |
129 | static struct openflags global_openflags = OPEN_FLAGS; |
130 | ||
131 | struct cow { | |
2a9d32f6 | 132 | /* backing file name */ |
1da177e4 | 133 | char *file; |
2a9d32f6 | 134 | /* backing file fd */ |
1da177e4 LT |
135 | int fd; |
136 | unsigned long *bitmap; | |
137 | unsigned long bitmap_len; | |
138 | int bitmap_offset; | |
dc764e50 | 139 | int data_offset; |
1da177e4 LT |
140 | }; |
141 | ||
a0044bdf JD |
142 | #define MAX_SG 64 |
143 | ||
1da177e4 | 144 | struct ubd { |
a0044bdf | 145 | struct list_head restart; |
2a9d32f6 PBG |
146 | /* name (and fd, below) of the file opened for writing, either the |
147 | * backing or the cow file. */ | |
1da177e4 LT |
148 | char *file; |
149 | int count; | |
150 | int fd; | |
151 | __u64 size; | |
152 | struct openflags boot_openflags; | |
153 | struct openflags openflags; | |
84e945e3 PBG |
154 | unsigned shared:1; |
155 | unsigned no_cow:1; | |
1da177e4 LT |
156 | struct cow cow; |
157 | struct platform_device pdev; | |
62f96cb0 JD |
158 | struct request_queue *queue; |
159 | spinlock_t lock; | |
a0044bdf JD |
160 | struct scatterlist sg[MAX_SG]; |
161 | struct request *request; | |
162 | int start_sg, end_sg; | |
47526903 | 163 | sector_t rq_pos; |
1da177e4 LT |
164 | }; |
165 | ||
166 | #define DEFAULT_COW { \ | |
167 | .file = NULL, \ | |
dc764e50 JD |
168 | .fd = -1, \ |
169 | .bitmap = NULL, \ | |
1da177e4 | 170 | .bitmap_offset = 0, \ |
dc764e50 | 171 | .data_offset = 0, \ |
1da177e4 LT |
172 | } |
173 | ||
174 | #define DEFAULT_UBD { \ | |
175 | .file = NULL, \ | |
176 | .count = 0, \ | |
177 | .fd = -1, \ | |
178 | .size = -1, \ | |
179 | .boot_openflags = OPEN_FLAGS, \ | |
180 | .openflags = OPEN_FLAGS, \ | |
dc764e50 | 181 | .no_cow = 0, \ |
6c29256c | 182 | .shared = 0, \ |
dc764e50 | 183 | .cow = DEFAULT_COW, \ |
22e65004 | 184 | .lock = __SPIN_LOCK_UNLOCKED(ubd_devs.lock), \ |
a0044bdf JD |
185 | .request = NULL, \ |
186 | .start_sg = 0, \ | |
187 | .end_sg = 0, \ | |
47526903 | 188 | .rq_pos = 0, \ |
1da177e4 LT |
189 | } |
190 | ||
b8831a1d | 191 | /* Protected by ubd_lock */ |
5dc62b1b | 192 | static struct ubd ubd_devs[MAX_DEV] = { [0 ... MAX_DEV - 1] = DEFAULT_UBD }; |
1da177e4 | 193 | |
1da177e4 LT |
194 | /* Only changed by fake_ide_setup which is a setup */ |
195 | static int fake_ide = 0; | |
196 | static struct proc_dir_entry *proc_ide_root = NULL; | |
197 | static struct proc_dir_entry *proc_ide = NULL; | |
198 | ||
199 | static void make_proc_ide(void) | |
200 | { | |
201 | proc_ide_root = proc_mkdir("ide", NULL); | |
202 | proc_ide = proc_mkdir("ide0", proc_ide_root); | |
203 | } | |
204 | ||
6613c5e8 | 205 | static int fake_ide_media_proc_show(struct seq_file *m, void *v) |
1da177e4 | 206 | { |
6613c5e8 AD |
207 | seq_puts(m, "disk\n"); |
208 | return 0; | |
209 | } | |
210 | ||
211 | static int fake_ide_media_proc_open(struct inode *inode, struct file *file) | |
212 | { | |
213 | return single_open(file, fake_ide_media_proc_show, NULL); | |
1da177e4 LT |
214 | } |
215 | ||
6613c5e8 AD |
216 | static const struct file_operations fake_ide_media_proc_fops = { |
217 | .owner = THIS_MODULE, | |
218 | .open = fake_ide_media_proc_open, | |
219 | .read = seq_read, | |
220 | .llseek = seq_lseek, | |
221 | .release = single_release, | |
222 | }; | |
223 | ||
c0a9290e | 224 | static void make_ide_entries(const char *dev_name) |
1da177e4 LT |
225 | { |
226 | struct proc_dir_entry *dir, *ent; | |
227 | char name[64]; | |
228 | ||
229 | if(proc_ide_root == NULL) make_proc_ide(); | |
230 | ||
231 | dir = proc_mkdir(dev_name, proc_ide); | |
232 | if(!dir) return; | |
233 | ||
6613c5e8 | 234 | ent = proc_create("media", S_IRUGO, dir, &fake_ide_media_proc_fops); |
1da177e4 | 235 | if(!ent) return; |
c0a9290e | 236 | snprintf(name, sizeof(name), "ide0/%s", dev_name); |
1da177e4 LT |
237 | proc_symlink(dev_name, proc_ide_root, name); |
238 | } | |
239 | ||
240 | static int fake_ide_setup(char *str) | |
241 | { | |
242 | fake_ide = 1; | |
dc764e50 | 243 | return 1; |
1da177e4 LT |
244 | } |
245 | ||
246 | __setup("fake_ide", fake_ide_setup); | |
247 | ||
248 | __uml_help(fake_ide_setup, | |
249 | "fake_ide\n" | |
250 | " Create ide0 entries that map onto ubd devices.\n\n" | |
251 | ); | |
252 | ||
253 | static int parse_unit(char **ptr) | |
254 | { | |
255 | char *str = *ptr, *end; | |
256 | int n = -1; | |
257 | ||
258 | if(isdigit(*str)) { | |
259 | n = simple_strtoul(str, &end, 0); | |
260 | if(end == str) | |
dc764e50 | 261 | return -1; |
1da177e4 LT |
262 | *ptr = end; |
263 | } | |
97d88ac8 | 264 | else if (('a' <= *str) && (*str <= 'z')) { |
1da177e4 LT |
265 | n = *str - 'a'; |
266 | str++; | |
267 | *ptr = str; | |
268 | } | |
dc764e50 | 269 | return n; |
1da177e4 LT |
270 | } |
271 | ||
d8d7c28e PBG |
272 | /* If *index_out == -1 at exit, the passed option was a general one; |
273 | * otherwise, the str pointer is used (and owned) inside ubd_devs array, so it | |
274 | * should not be freed on exit. | |
275 | */ | |
f28169d2 | 276 | static int ubd_setup_common(char *str, int *index_out, char **error_out) |
1da177e4 | 277 | { |
7d314e34 | 278 | struct ubd *ubd_dev; |
1da177e4 LT |
279 | struct openflags flags = global_openflags; |
280 | char *backing_file; | |
b8831a1d | 281 | int n, err = 0, i; |
1da177e4 LT |
282 | |
283 | if(index_out) *index_out = -1; | |
284 | n = *str; | |
285 | if(n == '='){ | |
286 | char *end; | |
287 | int major; | |
288 | ||
289 | str++; | |
1da177e4 LT |
290 | if(!strcmp(str, "sync")){ |
291 | global_openflags = of_sync(global_openflags); | |
b8831a1d | 292 | goto out1; |
1da177e4 | 293 | } |
b8831a1d JD |
294 | |
295 | err = -EINVAL; | |
1da177e4 LT |
296 | major = simple_strtoul(str, &end, 0); |
297 | if((*end != '\0') || (end == str)){ | |
f28169d2 | 298 | *error_out = "Didn't parse major number"; |
b8831a1d | 299 | goto out1; |
1da177e4 LT |
300 | } |
301 | ||
f28169d2 | 302 | mutex_lock(&ubd_lock); |
792dd4fc | 303 | if (fake_major != UBD_MAJOR) { |
f28169d2 JD |
304 | *error_out = "Can't assign a fake major twice"; |
305 | goto out1; | |
306 | } | |
6c29256c | 307 | |
f28169d2 | 308 | fake_major = major; |
1da177e4 LT |
309 | |
310 | printk(KERN_INFO "Setting extra ubd major number to %d\n", | |
311 | major); | |
f28169d2 JD |
312 | err = 0; |
313 | out1: | |
314 | mutex_unlock(&ubd_lock); | |
315 | return err; | |
1da177e4 LT |
316 | } |
317 | ||
318 | n = parse_unit(&str); | |
319 | if(n < 0){ | |
f28169d2 JD |
320 | *error_out = "Couldn't parse device number"; |
321 | return -EINVAL; | |
1da177e4 LT |
322 | } |
323 | if(n >= MAX_DEV){ | |
f28169d2 JD |
324 | *error_out = "Device number out of range"; |
325 | return 1; | |
1da177e4 LT |
326 | } |
327 | ||
f28169d2 | 328 | err = -EBUSY; |
d7fb2c38 | 329 | mutex_lock(&ubd_lock); |
1da177e4 | 330 | |
7d314e34 PBG |
331 | ubd_dev = &ubd_devs[n]; |
332 | if(ubd_dev->file != NULL){ | |
f28169d2 | 333 | *error_out = "Device is already configured"; |
1da177e4 LT |
334 | goto out; |
335 | } | |
336 | ||
337 | if (index_out) | |
338 | *index_out = n; | |
339 | ||
f28169d2 | 340 | err = -EINVAL; |
6c29256c | 341 | for (i = 0; i < sizeof("rscd="); i++) { |
1da177e4 LT |
342 | switch (*str) { |
343 | case 'r': | |
344 | flags.w = 0; | |
345 | break; | |
346 | case 's': | |
347 | flags.s = 1; | |
348 | break; | |
349 | case 'd': | |
7d314e34 | 350 | ubd_dev->no_cow = 1; |
1da177e4 | 351 | break; |
6c29256c | 352 | case 'c': |
7d314e34 | 353 | ubd_dev->shared = 1; |
6c29256c | 354 | break; |
1da177e4 LT |
355 | case '=': |
356 | str++; | |
357 | goto break_loop; | |
358 | default: | |
f28169d2 JD |
359 | *error_out = "Expected '=' or flag letter " |
360 | "(r, s, c, or d)"; | |
1da177e4 LT |
361 | goto out; |
362 | } | |
363 | str++; | |
364 | } | |
365 | ||
f28169d2 JD |
366 | if (*str == '=') |
367 | *error_out = "Too many flags specified"; | |
368 | else | |
369 | *error_out = "Missing '='"; | |
1da177e4 LT |
370 | goto out; |
371 | ||
372 | break_loop: | |
1da177e4 LT |
373 | backing_file = strchr(str, ','); |
374 | ||
f28169d2 | 375 | if (backing_file == NULL) |
1da177e4 | 376 | backing_file = strchr(str, ':'); |
1da177e4 | 377 | |
f28169d2 JD |
378 | if(backing_file != NULL){ |
379 | if(ubd_dev->no_cow){ | |
380 | *error_out = "Can't specify both 'd' and a cow file"; | |
381 | goto out; | |
382 | } | |
1da177e4 LT |
383 | else { |
384 | *backing_file = '\0'; | |
385 | backing_file++; | |
386 | } | |
387 | } | |
f28169d2 | 388 | err = 0; |
7d314e34 PBG |
389 | ubd_dev->file = str; |
390 | ubd_dev->cow.file = backing_file; | |
391 | ubd_dev->boot_openflags = flags; | |
1da177e4 | 392 | out: |
d7fb2c38 | 393 | mutex_unlock(&ubd_lock); |
f28169d2 | 394 | return err; |
1da177e4 LT |
395 | } |
396 | ||
397 | static int ubd_setup(char *str) | |
398 | { | |
f28169d2 JD |
399 | char *error; |
400 | int err; | |
401 | ||
402 | err = ubd_setup_common(str, NULL, &error); | |
403 | if(err) | |
404 | printk(KERN_ERR "Failed to initialize device with \"%s\" : " | |
405 | "%s\n", str, error); | |
406 | return 1; | |
1da177e4 LT |
407 | } |
408 | ||
409 | __setup("ubd", ubd_setup); | |
410 | __uml_help(ubd_setup, | |
411 | "ubd<n><flags>=<filename>[(:|,)<filename2>]\n" | |
412 | " This is used to associate a device with a file in the underlying\n" | |
413 | " filesystem. When specifying two filenames, the first one is the\n" | |
414 | " COW name and the second is the backing file name. As separator you can\n" | |
415 | " use either a ':' or a ',': the first one allows writing things like;\n" | |
416 | " ubd0=~/Uml/root_cow:~/Uml/root_backing_file\n" | |
417 | " while with a ',' the shell would not expand the 2nd '~'.\n" | |
f28169d2 | 418 | " When using only one filename, UML will detect whether to treat it like\n" |
1da177e4 LT |
419 | " a COW file or a backing file. To override this detection, add the 'd'\n" |
420 | " flag:\n" | |
421 | " ubd0d=BackingFile\n" | |
422 | " Usually, there is a filesystem in the file, but \n" | |
423 | " that's not required. Swap devices containing swap files can be\n" | |
424 | " specified like this. Also, a file which doesn't contain a\n" | |
425 | " filesystem can have its contents read in the virtual \n" | |
426 | " machine by running 'dd' on the device. <n> must be in the range\n" | |
427 | " 0 to 7. Appending an 'r' to the number will cause that device\n" | |
428 | " to be mounted read-only. For example ubd1r=./ext_fs. Appending\n" | |
20ede453 JD |
429 | " an 's' will cause data to be written to disk on the host immediately.\n" |
430 | " 'c' will cause the device to be treated as being shared between multiple\n" | |
431 | " UMLs and file locking will be turned off - this is appropriate for a\n" | |
432 | " cluster filesystem and inappropriate at almost all other times.\n\n" | |
1da177e4 LT |
433 | ); |
434 | ||
8299ca5c | 435 | static int udb_setup(char *str) |
1da177e4 LT |
436 | { |
437 | printk("udb%s specified on command line is almost certainly a ubd -> " | |
438 | "udb TYPO\n", str); | |
dc764e50 | 439 | return 1; |
1da177e4 LT |
440 | } |
441 | ||
442 | __setup("udb", udb_setup); | |
443 | __uml_help(udb_setup, | |
444 | "udb\n" | |
0894e27e JD |
445 | " This option is here solely to catch ubd -> udb typos, which can be\n" |
446 | " to impossible to catch visually unless you specifically look for\n" | |
447 | " them. The only result of any option starting with 'udb' is an error\n" | |
1da177e4 LT |
448 | " in the boot output.\n\n" |
449 | ); | |
450 | ||
165125e1 | 451 | static void do_ubd_request(struct request_queue * q); |
91acb21f JD |
452 | |
453 | /* Only changed by ubd_init, which is an initcall. */ | |
5dc62b1b | 454 | static int thread_fd = -1; |
a0044bdf JD |
455 | static LIST_HEAD(restart); |
456 | ||
f88f0bdf AI |
457 | /* Function to read several request pointers at a time |
458 | * handling fractional reads if (and as) needed | |
459 | */ | |
460 | ||
461 | static int bulk_req_safe_read( | |
462 | int fd, | |
463 | struct io_thread_req * (*request_buffer)[], | |
464 | struct io_thread_req **remainder, | |
465 | int *remainder_size, | |
466 | int max_recs | |
467 | ) | |
468 | { | |
469 | int n = 0; | |
470 | int res = 0; | |
471 | ||
472 | if (*remainder_size > 0) { | |
473 | memmove( | |
474 | (char *) request_buffer, | |
475 | (char *) remainder, *remainder_size | |
476 | ); | |
477 | n = *remainder_size; | |
478 | } | |
479 | ||
480 | res = os_read_file( | |
481 | fd, | |
482 | ((char *) request_buffer) + *remainder_size, | |
483 | sizeof(struct io_thread_req *)*max_recs | |
484 | - *remainder_size | |
485 | ); | |
486 | if (res > 0) { | |
487 | n += res; | |
488 | if ((n % sizeof(struct io_thread_req *)) > 0) { | |
489 | /* | |
490 | * Read somehow returned not a multiple of dword | |
491 | * theoretically possible, but never observed in the | |
492 | * wild, so read routine must be able to handle it | |
493 | */ | |
494 | *remainder_size = n % sizeof(struct io_thread_req *); | |
495 | WARN(*remainder_size > 0, "UBD IPC read returned a partial result"); | |
496 | memmove( | |
497 | remainder, | |
498 | ((char *) request_buffer) + | |
499 | (n/sizeof(struct io_thread_req *))*sizeof(struct io_thread_req *), | |
500 | *remainder_size | |
501 | ); | |
502 | n = n - *remainder_size; | |
503 | } | |
504 | } else { | |
505 | n = res; | |
506 | } | |
507 | return n; | |
508 | } | |
509 | ||
62f96cb0 | 510 | /* Called without dev->lock held, and only in interrupt context. */ |
91acb21f | 511 | static void ubd_handler(void) |
1da177e4 | 512 | { |
a0044bdf JD |
513 | struct ubd *ubd; |
514 | struct list_head *list, *next_ele; | |
515 | unsigned long flags; | |
91acb21f | 516 | int n; |
f88f0bdf | 517 | int count; |
91acb21f | 518 | |
a0044bdf | 519 | while(1){ |
f88f0bdf AI |
520 | n = bulk_req_safe_read( |
521 | thread_fd, | |
522 | irq_req_buffer, | |
523 | &irq_remainder, | |
524 | &irq_remainder_size, | |
525 | UBD_REQ_BUFFER_SIZE | |
526 | ); | |
527 | if (n < 0) { | |
a0044bdf JD |
528 | if(n == -EAGAIN) |
529 | break; | |
530 | printk(KERN_ERR "spurious interrupt in ubd_handler, " | |
531 | "err = %d\n", -n); | |
532 | return; | |
533 | } | |
f88f0bdf AI |
534 | for (count = 0; count < n/sizeof(struct io_thread_req *); count++) { |
535 | blk_end_request( | |
536 | (*irq_req_buffer)[count]->req, | |
2a842aca | 537 | BLK_STS_OK, |
f88f0bdf AI |
538 | (*irq_req_buffer)[count]->length |
539 | ); | |
540 | kfree((*irq_req_buffer)[count]); | |
541 | } | |
a0044bdf | 542 | } |
62f96cb0 | 543 | reactivate_fd(thread_fd, UBD_IRQ); |
a0044bdf JD |
544 | |
545 | list_for_each_safe(list, next_ele, &restart){ | |
546 | ubd = container_of(list, struct ubd, restart); | |
547 | list_del_init(&ubd->restart); | |
548 | spin_lock_irqsave(&ubd->lock, flags); | |
549 | do_ubd_request(ubd->queue); | |
550 | spin_unlock_irqrestore(&ubd->lock, flags); | |
551 | } | |
1da177e4 LT |
552 | } |
553 | ||
7bea96fd | 554 | static irqreturn_t ubd_intr(int irq, void *dev) |
1da177e4 | 555 | { |
91acb21f | 556 | ubd_handler(); |
dc764e50 | 557 | return IRQ_HANDLED; |
91acb21f | 558 | } |
09ace81c | 559 | |
91acb21f JD |
560 | /* Only changed by ubd_init, which is an initcall. */ |
561 | static int io_pid = -1; | |
09ace81c | 562 | |
5dc62b1b | 563 | static void kill_io_thread(void) |
91acb21f | 564 | { |
6c29256c | 565 | if(io_pid != -1) |
91acb21f | 566 | os_kill_process(io_pid, 1); |
09ace81c | 567 | } |
1da177e4 | 568 | |
91acb21f JD |
569 | __uml_exitcall(kill_io_thread); |
570 | ||
d8d7c28e | 571 | static inline int ubd_file_size(struct ubd *ubd_dev, __u64 *size_out) |
1da177e4 LT |
572 | { |
573 | char *file; | |
85356398 RW |
574 | int fd; |
575 | int err; | |
576 | ||
577 | __u32 version; | |
578 | __u32 align; | |
579 | char *backing_file; | |
580 | time_t mtime; | |
581 | unsigned long long size; | |
582 | int sector_size; | |
583 | int bitmap_offset; | |
584 | ||
585 | if (ubd_dev->file && ubd_dev->cow.file) { | |
586 | file = ubd_dev->cow.file; | |
587 | ||
588 | goto out; | |
589 | } | |
590 | ||
d4afcba9 | 591 | fd = os_open_file(ubd_dev->file, of_read(OPENFLAGS()), 0); |
85356398 RW |
592 | if (fd < 0) |
593 | return fd; | |
594 | ||
595 | err = read_cow_header(file_reader, &fd, &version, &backing_file, \ | |
596 | &mtime, &size, §or_size, &align, &bitmap_offset); | |
597 | os_close_file(fd); | |
1da177e4 | 598 | |
85356398 RW |
599 | if(err == -EINVAL) |
600 | file = ubd_dev->file; | |
601 | else | |
602 | file = backing_file; | |
603 | ||
604 | out: | |
dc764e50 | 605 | return os_file_size(file, size_out); |
1da177e4 LT |
606 | } |
607 | ||
5dc62b1b WC |
608 | static int read_cow_bitmap(int fd, void *buf, int offset, int len) |
609 | { | |
610 | int err; | |
611 | ||
8c6157b6 | 612 | err = os_pread_file(fd, buf, len, offset); |
5dc62b1b WC |
613 | if (err < 0) |
614 | return err; | |
615 | ||
616 | return 0; | |
617 | } | |
618 | ||
619 | static int backing_file_mismatch(char *file, __u64 size, time_t mtime) | |
620 | { | |
621 | unsigned long modtime; | |
622 | unsigned long long actual; | |
623 | int err; | |
624 | ||
625 | err = os_file_modtime(file, &modtime); | |
626 | if (err < 0) { | |
627 | printk(KERN_ERR "Failed to get modification time of backing " | |
628 | "file \"%s\", err = %d\n", file, -err); | |
629 | return err; | |
630 | } | |
631 | ||
632 | err = os_file_size(file, &actual); | |
633 | if (err < 0) { | |
634 | printk(KERN_ERR "Failed to get size of backing file \"%s\", " | |
635 | "err = %d\n", file, -err); | |
636 | return err; | |
637 | } | |
638 | ||
639 | if (actual != size) { | |
640 | /*__u64 can be a long on AMD64 and with %lu GCC complains; so | |
641 | * the typecast.*/ | |
642 | printk(KERN_ERR "Size mismatch (%llu vs %llu) of COW header " | |
643 | "vs backing file\n", (unsigned long long) size, actual); | |
644 | return -EINVAL; | |
645 | } | |
646 | if (modtime != mtime) { | |
647 | printk(KERN_ERR "mtime mismatch (%ld vs %ld) of COW header vs " | |
648 | "backing file\n", mtime, modtime); | |
649 | return -EINVAL; | |
650 | } | |
651 | return 0; | |
652 | } | |
653 | ||
654 | static int path_requires_switch(char *from_cmdline, char *from_cow, char *cow) | |
655 | { | |
656 | struct uml_stat buf1, buf2; | |
657 | int err; | |
658 | ||
659 | if (from_cmdline == NULL) | |
660 | return 0; | |
661 | if (!strcmp(from_cmdline, from_cow)) | |
662 | return 0; | |
663 | ||
664 | err = os_stat_file(from_cmdline, &buf1); | |
665 | if (err < 0) { | |
666 | printk(KERN_ERR "Couldn't stat '%s', err = %d\n", from_cmdline, | |
667 | -err); | |
668 | return 0; | |
669 | } | |
670 | err = os_stat_file(from_cow, &buf2); | |
671 | if (err < 0) { | |
672 | printk(KERN_ERR "Couldn't stat '%s', err = %d\n", from_cow, | |
673 | -err); | |
674 | return 1; | |
675 | } | |
676 | if ((buf1.ust_dev == buf2.ust_dev) && (buf1.ust_ino == buf2.ust_ino)) | |
677 | return 0; | |
678 | ||
679 | printk(KERN_ERR "Backing file mismatch - \"%s\" requested, " | |
680 | "\"%s\" specified in COW header of \"%s\"\n", | |
681 | from_cmdline, from_cow, cow); | |
682 | return 1; | |
683 | } | |
684 | ||
685 | static int open_ubd_file(char *file, struct openflags *openflags, int shared, | |
686 | char **backing_file_out, int *bitmap_offset_out, | |
687 | unsigned long *bitmap_len_out, int *data_offset_out, | |
688 | int *create_cow_out) | |
689 | { | |
690 | time_t mtime; | |
691 | unsigned long long size; | |
692 | __u32 version, align; | |
693 | char *backing_file; | |
694 | int fd, err, sectorsize, asked_switch, mode = 0644; | |
695 | ||
696 | fd = os_open_file(file, *openflags, mode); | |
697 | if (fd < 0) { | |
698 | if ((fd == -ENOENT) && (create_cow_out != NULL)) | |
699 | *create_cow_out = 1; | |
700 | if (!openflags->w || | |
701 | ((fd != -EROFS) && (fd != -EACCES))) | |
702 | return fd; | |
703 | openflags->w = 0; | |
704 | fd = os_open_file(file, *openflags, mode); | |
705 | if (fd < 0) | |
706 | return fd; | |
707 | } | |
708 | ||
709 | if (shared) | |
710 | printk(KERN_INFO "Not locking \"%s\" on the host\n", file); | |
711 | else { | |
712 | err = os_lock_file(fd, openflags->w); | |
713 | if (err < 0) { | |
714 | printk(KERN_ERR "Failed to lock '%s', err = %d\n", | |
715 | file, -err); | |
716 | goto out_close; | |
717 | } | |
718 | } | |
719 | ||
720 | /* Successful return case! */ | |
721 | if (backing_file_out == NULL) | |
722 | return fd; | |
723 | ||
724 | err = read_cow_header(file_reader, &fd, &version, &backing_file, &mtime, | |
725 | &size, §orsize, &align, bitmap_offset_out); | |
726 | if (err && (*backing_file_out != NULL)) { | |
727 | printk(KERN_ERR "Failed to read COW header from COW file " | |
728 | "\"%s\", errno = %d\n", file, -err); | |
729 | goto out_close; | |
730 | } | |
731 | if (err) | |
732 | return fd; | |
733 | ||
734 | asked_switch = path_requires_switch(*backing_file_out, backing_file, | |
735 | file); | |
736 | ||
737 | /* Allow switching only if no mismatch. */ | |
738 | if (asked_switch && !backing_file_mismatch(*backing_file_out, size, | |
739 | mtime)) { | |
740 | printk(KERN_ERR "Switching backing file to '%s'\n", | |
741 | *backing_file_out); | |
742 | err = write_cow_header(file, fd, *backing_file_out, | |
743 | sectorsize, align, &size); | |
744 | if (err) { | |
745 | printk(KERN_ERR "Switch failed, errno = %d\n", -err); | |
746 | goto out_close; | |
747 | } | |
748 | } else { | |
749 | *backing_file_out = backing_file; | |
750 | err = backing_file_mismatch(*backing_file_out, size, mtime); | |
751 | if (err) | |
752 | goto out_close; | |
753 | } | |
754 | ||
755 | cow_sizes(version, size, sectorsize, align, *bitmap_offset_out, | |
756 | bitmap_len_out, data_offset_out); | |
757 | ||
758 | return fd; | |
759 | out_close: | |
760 | os_close_file(fd); | |
761 | return err; | |
762 | } | |
763 | ||
764 | static int create_cow_file(char *cow_file, char *backing_file, | |
765 | struct openflags flags, | |
766 | int sectorsize, int alignment, int *bitmap_offset_out, | |
767 | unsigned long *bitmap_len_out, int *data_offset_out) | |
768 | { | |
769 | int err, fd; | |
770 | ||
771 | flags.c = 1; | |
772 | fd = open_ubd_file(cow_file, &flags, 0, NULL, NULL, NULL, NULL, NULL); | |
773 | if (fd < 0) { | |
774 | err = fd; | |
775 | printk(KERN_ERR "Open of COW file '%s' failed, errno = %d\n", | |
776 | cow_file, -err); | |
777 | goto out; | |
778 | } | |
779 | ||
780 | err = init_cow_file(fd, cow_file, backing_file, sectorsize, alignment, | |
781 | bitmap_offset_out, bitmap_len_out, | |
782 | data_offset_out); | |
783 | if (!err) | |
784 | return fd; | |
785 | os_close_file(fd); | |
786 | out: | |
787 | return err; | |
788 | } | |
789 | ||
5f75a4f8 | 790 | static void ubd_close_dev(struct ubd *ubd_dev) |
1da177e4 | 791 | { |
7d314e34 PBG |
792 | os_close_file(ubd_dev->fd); |
793 | if(ubd_dev->cow.file == NULL) | |
1da177e4 LT |
794 | return; |
795 | ||
7d314e34 PBG |
796 | os_close_file(ubd_dev->cow.fd); |
797 | vfree(ubd_dev->cow.bitmap); | |
798 | ubd_dev->cow.bitmap = NULL; | |
1da177e4 LT |
799 | } |
800 | ||
7d314e34 | 801 | static int ubd_open_dev(struct ubd *ubd_dev) |
1da177e4 LT |
802 | { |
803 | struct openflags flags; | |
804 | char **back_ptr; | |
805 | int err, create_cow, *create_ptr; | |
0bf16bff | 806 | int fd; |
1da177e4 | 807 | |
7d314e34 | 808 | ubd_dev->openflags = ubd_dev->boot_openflags; |
1da177e4 | 809 | create_cow = 0; |
7d314e34 PBG |
810 | create_ptr = (ubd_dev->cow.file != NULL) ? &create_cow : NULL; |
811 | back_ptr = ubd_dev->no_cow ? NULL : &ubd_dev->cow.file; | |
0bf16bff PBG |
812 | |
813 | fd = open_ubd_file(ubd_dev->file, &ubd_dev->openflags, ubd_dev->shared, | |
7d314e34 PBG |
814 | back_ptr, &ubd_dev->cow.bitmap_offset, |
815 | &ubd_dev->cow.bitmap_len, &ubd_dev->cow.data_offset, | |
6c29256c | 816 | create_ptr); |
1da177e4 | 817 | |
0bf16bff PBG |
818 | if((fd == -ENOENT) && create_cow){ |
819 | fd = create_cow_file(ubd_dev->file, ubd_dev->cow.file, | |
7d314e34 PBG |
820 | ubd_dev->openflags, 1 << 9, PAGE_SIZE, |
821 | &ubd_dev->cow.bitmap_offset, | |
822 | &ubd_dev->cow.bitmap_len, | |
823 | &ubd_dev->cow.data_offset); | |
0bf16bff | 824 | if(fd >= 0){ |
1da177e4 | 825 | printk(KERN_INFO "Creating \"%s\" as COW file for " |
7d314e34 | 826 | "\"%s\"\n", ubd_dev->file, ubd_dev->cow.file); |
1da177e4 LT |
827 | } |
828 | } | |
829 | ||
0bf16bff | 830 | if(fd < 0){ |
7d314e34 | 831 | printk("Failed to open '%s', errno = %d\n", ubd_dev->file, |
0bf16bff PBG |
832 | -fd); |
833 | return fd; | |
1da177e4 | 834 | } |
0bf16bff | 835 | ubd_dev->fd = fd; |
1da177e4 | 836 | |
7d314e34 | 837 | if(ubd_dev->cow.file != NULL){ |
086fa5ff | 838 | blk_queue_max_hw_sectors(ubd_dev->queue, 8 * sizeof(long)); |
f4768ffd | 839 | |
1da177e4 | 840 | err = -ENOMEM; |
da2486ba | 841 | ubd_dev->cow.bitmap = vmalloc(ubd_dev->cow.bitmap_len); |
7d314e34 | 842 | if(ubd_dev->cow.bitmap == NULL){ |
1da177e4 LT |
843 | printk(KERN_ERR "Failed to vmalloc COW bitmap\n"); |
844 | goto error; | |
845 | } | |
846 | flush_tlb_kernel_vm(); | |
847 | ||
7d314e34 PBG |
848 | err = read_cow_bitmap(ubd_dev->fd, ubd_dev->cow.bitmap, |
849 | ubd_dev->cow.bitmap_offset, | |
850 | ubd_dev->cow.bitmap_len); | |
1da177e4 LT |
851 | if(err < 0) |
852 | goto error; | |
853 | ||
7d314e34 | 854 | flags = ubd_dev->openflags; |
1da177e4 | 855 | flags.w = 0; |
7d314e34 | 856 | err = open_ubd_file(ubd_dev->cow.file, &flags, ubd_dev->shared, NULL, |
6c29256c | 857 | NULL, NULL, NULL, NULL); |
1da177e4 | 858 | if(err < 0) goto error; |
7d314e34 | 859 | ubd_dev->cow.fd = err; |
1da177e4 | 860 | } |
dc764e50 | 861 | return 0; |
1da177e4 | 862 | error: |
7d314e34 | 863 | os_close_file(ubd_dev->fd); |
dc764e50 | 864 | return err; |
1da177e4 LT |
865 | } |
866 | ||
2e3f5251 JD |
867 | static void ubd_device_release(struct device *dev) |
868 | { | |
8691b97b | 869 | struct ubd *ubd_dev = dev_get_drvdata(dev); |
2e3f5251 JD |
870 | |
871 | blk_cleanup_queue(ubd_dev->queue); | |
872 | *ubd_dev = ((struct ubd) DEFAULT_UBD); | |
873 | } | |
874 | ||
5f75a4f8 | 875 | static int ubd_disk_register(int major, u64 size, int unit, |
b8831a1d | 876 | struct gendisk **disk_out) |
1da177e4 | 877 | { |
d72a5783 | 878 | struct device *parent = NULL; |
1da177e4 | 879 | struct gendisk *disk; |
1da177e4 LT |
880 | |
881 | disk = alloc_disk(1 << UBD_SHIFT); | |
882 | if(disk == NULL) | |
dc764e50 | 883 | return -ENOMEM; |
1da177e4 LT |
884 | |
885 | disk->major = major; | |
886 | disk->first_minor = unit << UBD_SHIFT; | |
887 | disk->fops = &ubd_blops; | |
888 | set_capacity(disk, size / 512); | |
792dd4fc | 889 | if (major == UBD_MAJOR) |
1da177e4 | 890 | sprintf(disk->disk_name, "ubd%c", 'a' + unit); |
ce7b0f46 | 891 | else |
1da177e4 | 892 | sprintf(disk->disk_name, "ubd_fake%d", unit); |
1da177e4 LT |
893 | |
894 | /* sysfs register (not for ide fake devices) */ | |
792dd4fc | 895 | if (major == UBD_MAJOR) { |
7d314e34 PBG |
896 | ubd_devs[unit].pdev.id = unit; |
897 | ubd_devs[unit].pdev.name = DRIVER_NAME; | |
2e3f5251 | 898 | ubd_devs[unit].pdev.dev.release = ubd_device_release; |
8691b97b | 899 | dev_set_drvdata(&ubd_devs[unit].pdev.dev, &ubd_devs[unit]); |
7d314e34 | 900 | platform_device_register(&ubd_devs[unit].pdev); |
d72a5783 | 901 | parent = &ubd_devs[unit].pdev.dev; |
1da177e4 LT |
902 | } |
903 | ||
7d314e34 | 904 | disk->private_data = &ubd_devs[unit]; |
62f96cb0 | 905 | disk->queue = ubd_devs[unit].queue; |
d72a5783 | 906 | device_add_disk(parent, disk); |
1da177e4 LT |
907 | |
908 | *disk_out = disk; | |
909 | return 0; | |
910 | } | |
911 | ||
912 | #define ROUND_BLOCK(n) ((n + ((1 << 9) - 1)) & (-1 << 9)) | |
913 | ||
f28169d2 | 914 | static int ubd_add(int n, char **error_out) |
1da177e4 | 915 | { |
7d314e34 | 916 | struct ubd *ubd_dev = &ubd_devs[n]; |
f28169d2 | 917 | int err = 0; |
1da177e4 | 918 | |
7d314e34 | 919 | if(ubd_dev->file == NULL) |
ec7cf783 | 920 | goto out; |
1da177e4 | 921 | |
7d314e34 | 922 | err = ubd_file_size(ubd_dev, &ubd_dev->size); |
f28169d2 JD |
923 | if(err < 0){ |
924 | *error_out = "Couldn't determine size of device's file"; | |
80c13749 | 925 | goto out; |
f28169d2 | 926 | } |
1da177e4 | 927 | |
7d314e34 | 928 | ubd_dev->size = ROUND_BLOCK(ubd_dev->size); |
1da177e4 | 929 | |
a0044bdf | 930 | INIT_LIST_HEAD(&ubd_dev->restart); |
4f40c055 | 931 | sg_init_table(ubd_dev->sg, MAX_SG); |
a0044bdf | 932 | |
62f96cb0 JD |
933 | err = -ENOMEM; |
934 | ubd_dev->queue = blk_init_queue(do_ubd_request, &ubd_dev->lock); | |
935 | if (ubd_dev->queue == NULL) { | |
936 | *error_out = "Failed to initialize device queue"; | |
80c13749 | 937 | goto out; |
62f96cb0 JD |
938 | } |
939 | ubd_dev->queue->queuedata = ubd_dev; | |
f935a8ce | 940 | blk_queue_write_cache(ubd_dev->queue, true, false); |
62f96cb0 | 941 | |
8a78362c | 942 | blk_queue_max_segments(ubd_dev->queue, MAX_SG); |
792dd4fc | 943 | err = ubd_disk_register(UBD_MAJOR, ubd_dev->size, n, &ubd_gendisk[n]); |
62f96cb0 JD |
944 | if(err){ |
945 | *error_out = "Failed to register device"; | |
946 | goto out_cleanup; | |
947 | } | |
6c29256c | 948 | |
792dd4fc | 949 | if (fake_major != UBD_MAJOR) |
5f75a4f8 | 950 | ubd_disk_register(fake_major, ubd_dev->size, n, |
62f96cb0 | 951 | &fake_gendisk[n]); |
1da177e4 | 952 | |
83380cc1 JD |
953 | /* |
954 | * Perhaps this should also be under the "if (fake_major)" above | |
955 | * using the fake_disk->disk_name | |
956 | */ | |
1da177e4 LT |
957 | if (fake_ide) |
958 | make_ide_entries(ubd_gendisk[n]->disk_name); | |
959 | ||
ec7cf783 | 960 | err = 0; |
ec7cf783 JD |
961 | out: |
962 | return err; | |
62f96cb0 JD |
963 | |
964 | out_cleanup: | |
965 | blk_cleanup_queue(ubd_dev->queue); | |
966 | goto out; | |
1da177e4 LT |
967 | } |
968 | ||
f28169d2 | 969 | static int ubd_config(char *str, char **error_out) |
1da177e4 | 970 | { |
e7f6552f | 971 | int n, ret; |
1da177e4 | 972 | |
f28169d2 JD |
973 | /* This string is possibly broken up and stored, so it's only |
974 | * freed if ubd_setup_common fails, or if only general options | |
975 | * were set. | |
976 | */ | |
970d6e3a | 977 | str = kstrdup(str, GFP_KERNEL); |
e7f6552f | 978 | if (str == NULL) { |
f28169d2 JD |
979 | *error_out = "Failed to allocate memory"; |
980 | return -ENOMEM; | |
1da177e4 | 981 | } |
f28169d2 JD |
982 | |
983 | ret = ubd_setup_common(str, &n, error_out); | |
984 | if (ret) | |
e7f6552f | 985 | goto err_free; |
f28169d2 | 986 | |
e7f6552f PBG |
987 | if (n == -1) { |
988 | ret = 0; | |
d8d7c28e | 989 | goto err_free; |
1da177e4 | 990 | } |
1da177e4 | 991 | |
dc764e50 | 992 | mutex_lock(&ubd_lock); |
f28169d2 | 993 | ret = ubd_add(n, error_out); |
e7f6552f | 994 | if (ret) |
7d314e34 | 995 | ubd_devs[n].file = NULL; |
dc764e50 | 996 | mutex_unlock(&ubd_lock); |
1da177e4 | 997 | |
e7f6552f | 998 | out: |
dc764e50 | 999 | return ret; |
e7f6552f PBG |
1000 | |
1001 | err_free: | |
1002 | kfree(str); | |
1003 | goto out; | |
1da177e4 LT |
1004 | } |
1005 | ||
1006 | static int ubd_get_config(char *name, char *str, int size, char **error_out) | |
1007 | { | |
7d314e34 | 1008 | struct ubd *ubd_dev; |
1da177e4 LT |
1009 | int n, len = 0; |
1010 | ||
1011 | n = parse_unit(&name); | |
1012 | if((n >= MAX_DEV) || (n < 0)){ | |
1013 | *error_out = "ubd_get_config : device number out of range"; | |
dc764e50 | 1014 | return -1; |
1da177e4 LT |
1015 | } |
1016 | ||
7d314e34 | 1017 | ubd_dev = &ubd_devs[n]; |
d7fb2c38 | 1018 | mutex_lock(&ubd_lock); |
1da177e4 | 1019 | |
7d314e34 | 1020 | if(ubd_dev->file == NULL){ |
1da177e4 LT |
1021 | CONFIG_CHUNK(str, size, len, "", 1); |
1022 | goto out; | |
1023 | } | |
1024 | ||
7d314e34 | 1025 | CONFIG_CHUNK(str, size, len, ubd_dev->file, 0); |
1da177e4 | 1026 | |
7d314e34 | 1027 | if(ubd_dev->cow.file != NULL){ |
1da177e4 | 1028 | CONFIG_CHUNK(str, size, len, ",", 0); |
7d314e34 | 1029 | CONFIG_CHUNK(str, size, len, ubd_dev->cow.file, 1); |
1da177e4 LT |
1030 | } |
1031 | else CONFIG_CHUNK(str, size, len, "", 1); | |
1032 | ||
1033 | out: | |
d7fb2c38 | 1034 | mutex_unlock(&ubd_lock); |
dc764e50 | 1035 | return len; |
1da177e4 LT |
1036 | } |
1037 | ||
29d56cfe JD |
1038 | static int ubd_id(char **str, int *start_out, int *end_out) |
1039 | { | |
dc764e50 | 1040 | int n; |
29d56cfe JD |
1041 | |
1042 | n = parse_unit(str); | |
dc764e50 JD |
1043 | *start_out = 0; |
1044 | *end_out = MAX_DEV - 1; | |
1045 | return n; | |
29d56cfe JD |
1046 | } |
1047 | ||
f28169d2 | 1048 | static int ubd_remove(int n, char **error_out) |
1da177e4 | 1049 | { |
2e3f5251 | 1050 | struct gendisk *disk = ubd_gendisk[n]; |
7d314e34 | 1051 | struct ubd *ubd_dev; |
29d56cfe | 1052 | int err = -ENODEV; |
1da177e4 | 1053 | |
d7fb2c38 | 1054 | mutex_lock(&ubd_lock); |
1da177e4 | 1055 | |
7d314e34 | 1056 | ubd_dev = &ubd_devs[n]; |
1da177e4 | 1057 | |
7d314e34 | 1058 | if(ubd_dev->file == NULL) |
29d56cfe | 1059 | goto out; |
1da177e4 | 1060 | |
29d56cfe JD |
1061 | /* you cannot remove a open disk */ |
1062 | err = -EBUSY; | |
7d314e34 | 1063 | if(ubd_dev->count > 0) |
1da177e4 LT |
1064 | goto out; |
1065 | ||
dc764e50 | 1066 | ubd_gendisk[n] = NULL; |
b47d2deb JD |
1067 | if(disk != NULL){ |
1068 | del_gendisk(disk); | |
1069 | put_disk(disk); | |
1070 | } | |
1da177e4 LT |
1071 | |
1072 | if(fake_gendisk[n] != NULL){ | |
1073 | del_gendisk(fake_gendisk[n]); | |
1074 | put_disk(fake_gendisk[n]); | |
1075 | fake_gendisk[n] = NULL; | |
1076 | } | |
1077 | ||
1da177e4 | 1078 | err = 0; |
2e3f5251 | 1079 | platform_device_unregister(&ubd_dev->pdev); |
29d56cfe | 1080 | out: |
d7fb2c38 | 1081 | mutex_unlock(&ubd_lock); |
29d56cfe | 1082 | return err; |
1da177e4 LT |
1083 | } |
1084 | ||
f28169d2 | 1085 | /* All these are called by mconsole in process context and without |
b8831a1d | 1086 | * ubd-specific locks. The structure itself is const except for .list. |
f28169d2 | 1087 | */ |
1da177e4 | 1088 | static struct mc_device ubd_mc = { |
84f48d4f | 1089 | .list = LIST_HEAD_INIT(ubd_mc.list), |
1da177e4 LT |
1090 | .name = "ubd", |
1091 | .config = ubd_config, | |
dc764e50 | 1092 | .get_config = ubd_get_config, |
29d56cfe | 1093 | .id = ubd_id, |
1da177e4 LT |
1094 | .remove = ubd_remove, |
1095 | }; | |
1096 | ||
d8d7c28e | 1097 | static int __init ubd_mc_init(void) |
1da177e4 LT |
1098 | { |
1099 | mconsole_register_dev(&ubd_mc); | |
1100 | return 0; | |
1101 | } | |
1102 | ||
1103 | __initcall(ubd_mc_init); | |
1104 | ||
d8d7c28e PBG |
1105 | static int __init ubd0_init(void) |
1106 | { | |
1107 | struct ubd *ubd_dev = &ubd_devs[0]; | |
1108 | ||
b8831a1d | 1109 | mutex_lock(&ubd_lock); |
d8d7c28e PBG |
1110 | if(ubd_dev->file == NULL) |
1111 | ubd_dev->file = "root_fs"; | |
b8831a1d JD |
1112 | mutex_unlock(&ubd_lock); |
1113 | ||
dc764e50 | 1114 | return 0; |
d8d7c28e PBG |
1115 | } |
1116 | ||
1117 | __initcall(ubd0_init); | |
1118 | ||
b8831a1d | 1119 | /* Used in ubd_init, which is an initcall */ |
3ae5eaec RK |
1120 | static struct platform_driver ubd_driver = { |
1121 | .driver = { | |
1122 | .name = DRIVER_NAME, | |
1123 | }, | |
1da177e4 LT |
1124 | }; |
1125 | ||
d8d7c28e | 1126 | static int __init ubd_init(void) |
1da177e4 | 1127 | { |
f28169d2 JD |
1128 | char *error; |
1129 | int i, err; | |
1da177e4 | 1130 | |
792dd4fc | 1131 | if (register_blkdev(UBD_MAJOR, "ubd")) |
1da177e4 LT |
1132 | return -1; |
1133 | ||
792dd4fc | 1134 | if (fake_major != UBD_MAJOR) { |
1da177e4 LT |
1135 | char name[sizeof("ubd_nnn\0")]; |
1136 | ||
1137 | snprintf(name, sizeof(name), "ubd_%d", fake_major); | |
1da177e4 LT |
1138 | if (register_blkdev(fake_major, "ubd")) |
1139 | return -1; | |
1140 | } | |
f88f0bdf AI |
1141 | |
1142 | irq_req_buffer = kmalloc( | |
1143 | sizeof(struct io_thread_req *) * UBD_REQ_BUFFER_SIZE, | |
1144 | GFP_KERNEL | |
1145 | ); | |
1146 | irq_remainder = 0; | |
1147 | ||
1148 | if (irq_req_buffer == NULL) { | |
1149 | printk(KERN_ERR "Failed to initialize ubd buffering\n"); | |
1150 | return -1; | |
1151 | } | |
1152 | io_req_buffer = kmalloc( | |
1153 | sizeof(struct io_thread_req *) * UBD_REQ_BUFFER_SIZE, | |
1154 | GFP_KERNEL | |
1155 | ); | |
1156 | ||
1157 | io_remainder = 0; | |
1158 | ||
1159 | if (io_req_buffer == NULL) { | |
1160 | printk(KERN_ERR "Failed to initialize ubd buffering\n"); | |
1161 | return -1; | |
1162 | } | |
3ae5eaec | 1163 | platform_driver_register(&ubd_driver); |
dc764e50 | 1164 | mutex_lock(&ubd_lock); |
f28169d2 JD |
1165 | for (i = 0; i < MAX_DEV; i++){ |
1166 | err = ubd_add(i, &error); | |
1167 | if(err) | |
1168 | printk(KERN_ERR "Failed to initialize ubd device %d :" | |
1169 | "%s\n", i, error); | |
1170 | } | |
dc764e50 | 1171 | mutex_unlock(&ubd_lock); |
1da177e4 LT |
1172 | return 0; |
1173 | } | |
1174 | ||
1175 | late_initcall(ubd_init); | |
1176 | ||
d8d7c28e | 1177 | static int __init ubd_driver_init(void){ |
91acb21f JD |
1178 | unsigned long stack; |
1179 | int err; | |
1180 | ||
1181 | /* Set by CONFIG_BLK_DEV_UBD_SYNC or ubd=sync.*/ | |
1182 | if(global_openflags.s){ | |
1183 | printk(KERN_INFO "ubd: Synchronous mode\n"); | |
1184 | /* Letting ubd=sync be like using ubd#s= instead of ubd#= is | |
1185 | * enough. So use anyway the io thread. */ | |
1186 | } | |
1187 | stack = alloc_stack(0, 0); | |
6c29256c | 1188 | io_pid = start_io_thread(stack + PAGE_SIZE - sizeof(void *), |
91acb21f JD |
1189 | &thread_fd); |
1190 | if(io_pid < 0){ | |
6c29256c | 1191 | printk(KERN_ERR |
91acb21f JD |
1192 | "ubd : Failed to start I/O thread (errno = %d) - " |
1193 | "falling back to synchronous I/O\n", -io_pid); | |
1194 | io_pid = -1; | |
dc764e50 | 1195 | return 0; |
91acb21f | 1196 | } |
6c29256c | 1197 | err = um_request_irq(UBD_IRQ, thread_fd, IRQ_READ, ubd_intr, |
c0b79a90 | 1198 | 0, "ubd", ubd_devs); |
91acb21f JD |
1199 | if(err != 0) |
1200 | printk(KERN_ERR "um_request_irq failed - errno = %d\n", -err); | |
f4c57a78 | 1201 | return 0; |
91acb21f JD |
1202 | } |
1203 | ||
1204 | device_initcall(ubd_driver_init); | |
1205 | ||
a625c998 | 1206 | static int ubd_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 1207 | { |
a625c998 | 1208 | struct gendisk *disk = bdev->bd_disk; |
7d314e34 | 1209 | struct ubd *ubd_dev = disk->private_data; |
1da177e4 LT |
1210 | int err = 0; |
1211 | ||
9a181c58 | 1212 | mutex_lock(&ubd_mutex); |
7d314e34 PBG |
1213 | if(ubd_dev->count == 0){ |
1214 | err = ubd_open_dev(ubd_dev); | |
1da177e4 LT |
1215 | if(err){ |
1216 | printk(KERN_ERR "%s: Can't open \"%s\": errno = %d\n", | |
7d314e34 | 1217 | disk->disk_name, ubd_dev->file, -err); |
1da177e4 LT |
1218 | goto out; |
1219 | } | |
1220 | } | |
7d314e34 PBG |
1221 | ubd_dev->count++; |
1222 | set_disk_ro(disk, !ubd_dev->openflags.w); | |
2c49be99 PBG |
1223 | |
1224 | /* This should no more be needed. And it didn't work anyway to exclude | |
1225 | * read-write remounting of filesystems.*/ | |
a625c998 | 1226 | /*if((mode & FMODE_WRITE) && !ubd_dev->openflags.w){ |
5f75a4f8 | 1227 | if(--ubd_dev->count == 0) ubd_close_dev(ubd_dev); |
1da177e4 | 1228 | err = -EROFS; |
2c49be99 | 1229 | }*/ |
6e9624b8 | 1230 | out: |
9a181c58 | 1231 | mutex_unlock(&ubd_mutex); |
dc764e50 | 1232 | return err; |
1da177e4 LT |
1233 | } |
1234 | ||
db2a144b | 1235 | static void ubd_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 1236 | { |
7d314e34 | 1237 | struct ubd *ubd_dev = disk->private_data; |
1da177e4 | 1238 | |
9a181c58 | 1239 | mutex_lock(&ubd_mutex); |
7d314e34 | 1240 | if(--ubd_dev->count == 0) |
5f75a4f8 | 1241 | ubd_close_dev(ubd_dev); |
9a181c58 | 1242 | mutex_unlock(&ubd_mutex); |
1da177e4 LT |
1243 | } |
1244 | ||
91acb21f JD |
1245 | static void cowify_bitmap(__u64 io_offset, int length, unsigned long *cow_mask, |
1246 | __u64 *cow_offset, unsigned long *bitmap, | |
1247 | __u64 bitmap_offset, unsigned long *bitmap_words, | |
1248 | __u64 bitmap_len) | |
1da177e4 | 1249 | { |
91acb21f JD |
1250 | __u64 sector = io_offset >> 9; |
1251 | int i, update_bitmap = 0; | |
1252 | ||
1253 | for(i = 0; i < length >> 9; i++){ | |
1254 | if(cow_mask != NULL) | |
1255 | ubd_set_bit(i, (unsigned char *) cow_mask); | |
1256 | if(ubd_test_bit(sector + i, (unsigned char *) bitmap)) | |
1257 | continue; | |
1da177e4 | 1258 | |
91acb21f JD |
1259 | update_bitmap = 1; |
1260 | ubd_set_bit(sector + i, (unsigned char *) bitmap); | |
1261 | } | |
1262 | ||
1263 | if(!update_bitmap) | |
1264 | return; | |
1da177e4 | 1265 | |
91acb21f | 1266 | *cow_offset = sector / (sizeof(unsigned long) * 8); |
1da177e4 | 1267 | |
91acb21f JD |
1268 | /* This takes care of the case where we're exactly at the end of the |
1269 | * device, and *cow_offset + 1 is off the end. So, just back it up | |
1270 | * by one word. Thanks to Lynn Kerby for the fix and James McMechan | |
1271 | * for the original diagnosis. | |
1272 | */ | |
6d074242 JO |
1273 | if (*cow_offset == (DIV_ROUND_UP(bitmap_len, |
1274 | sizeof(unsigned long)) - 1)) | |
91acb21f JD |
1275 | (*cow_offset)--; |
1276 | ||
1277 | bitmap_words[0] = bitmap[*cow_offset]; | |
1278 | bitmap_words[1] = bitmap[*cow_offset + 1]; | |
1279 | ||
1280 | *cow_offset *= sizeof(unsigned long); | |
1281 | *cow_offset += bitmap_offset; | |
1282 | } | |
1283 | ||
1284 | static void cowify_req(struct io_thread_req *req, unsigned long *bitmap, | |
1285 | __u64 bitmap_offset, __u64 bitmap_len) | |
1286 | { | |
1287 | __u64 sector = req->offset >> 9; | |
1288 | int i; | |
1289 | ||
1290 | if(req->length > (sizeof(req->sector_mask) * 8) << 9) | |
1291 | panic("Operation too long"); | |
1292 | ||
1293 | if(req->op == UBD_READ) { | |
1294 | for(i = 0; i < req->length >> 9; i++){ | |
1295 | if(ubd_test_bit(sector + i, (unsigned char *) bitmap)) | |
6c29256c | 1296 | ubd_set_bit(i, (unsigned char *) |
91acb21f | 1297 | &req->sector_mask); |
dc764e50 | 1298 | } |
91acb21f JD |
1299 | } |
1300 | else cowify_bitmap(req->offset, req->length, &req->sector_mask, | |
1301 | &req->cow_offset, bitmap, bitmap_offset, | |
1302 | req->bitmap_words, bitmap_len); | |
1da177e4 LT |
1303 | } |
1304 | ||
62f96cb0 | 1305 | /* Called with dev->lock held */ |
a0044bdf JD |
1306 | static void prepare_request(struct request *req, struct io_thread_req *io_req, |
1307 | unsigned long long offset, int page_offset, | |
1308 | int len, struct page *page) | |
1da177e4 LT |
1309 | { |
1310 | struct gendisk *disk = req->rq_disk; | |
7d314e34 | 1311 | struct ubd *ubd_dev = disk->private_data; |
91acb21f | 1312 | |
62f96cb0 | 1313 | io_req->req = req; |
a0044bdf JD |
1314 | io_req->fds[0] = (ubd_dev->cow.file != NULL) ? ubd_dev->cow.fd : |
1315 | ubd_dev->fd; | |
7d314e34 | 1316 | io_req->fds[1] = ubd_dev->fd; |
91acb21f | 1317 | io_req->cow_offset = -1; |
1da177e4 LT |
1318 | io_req->offset = offset; |
1319 | io_req->length = len; | |
1320 | io_req->error = 0; | |
91acb21f JD |
1321 | io_req->sector_mask = 0; |
1322 | ||
1323 | io_req->op = (rq_data_dir(req) == READ) ? UBD_READ : UBD_WRITE; | |
1da177e4 | 1324 | io_req->offsets[0] = 0; |
7d314e34 | 1325 | io_req->offsets[1] = ubd_dev->cow.data_offset; |
a0044bdf | 1326 | io_req->buffer = page_address(page) + page_offset; |
1da177e4 LT |
1327 | io_req->sectorsize = 1 << 9; |
1328 | ||
7d314e34 | 1329 | if(ubd_dev->cow.file != NULL) |
a0044bdf JD |
1330 | cowify_req(io_req, ubd_dev->cow.bitmap, |
1331 | ubd_dev->cow.bitmap_offset, ubd_dev->cow.bitmap_len); | |
91acb21f | 1332 | |
1da177e4 LT |
1333 | } |
1334 | ||
805f11a0 RW |
1335 | /* Called with dev->lock held */ |
1336 | static void prepare_flush_request(struct request *req, | |
1337 | struct io_thread_req *io_req) | |
1338 | { | |
1339 | struct gendisk *disk = req->rq_disk; | |
1340 | struct ubd *ubd_dev = disk->private_data; | |
1341 | ||
1342 | io_req->req = req; | |
1343 | io_req->fds[0] = (ubd_dev->cow.file != NULL) ? ubd_dev->cow.fd : | |
1344 | ubd_dev->fd; | |
1345 | io_req->op = UBD_FLUSH; | |
1346 | } | |
1347 | ||
bc1d72e7 RW |
1348 | static bool submit_request(struct io_thread_req *io_req, struct ubd *dev) |
1349 | { | |
1350 | int n = os_write_file(thread_fd, &io_req, | |
1351 | sizeof(io_req)); | |
1352 | if (n != sizeof(io_req)) { | |
1353 | if (n != -EAGAIN) | |
1354 | printk("write to io thread failed, " | |
1355 | "errno = %d\n", -n); | |
1356 | else if (list_empty(&dev->restart)) | |
1357 | list_add(&dev->restart, &restart); | |
1358 | ||
1359 | kfree(io_req); | |
1360 | return false; | |
1361 | } | |
1362 | return true; | |
1363 | } | |
1364 | ||
62f96cb0 | 1365 | /* Called with dev->lock held */ |
165125e1 | 1366 | static void do_ubd_request(struct request_queue *q) |
1da177e4 | 1367 | { |
2adcec21 | 1368 | struct io_thread_req *io_req; |
1da177e4 | 1369 | struct request *req; |
a0044bdf JD |
1370 | |
1371 | while(1){ | |
2a9529a0 | 1372 | struct ubd *dev = q->queuedata; |
2a236122 | 1373 | if(dev->request == NULL){ |
9934c8c0 | 1374 | struct request *req = blk_fetch_request(q); |
a0044bdf JD |
1375 | if(req == NULL) |
1376 | return; | |
1377 | ||
1378 | dev->request = req; | |
47526903 | 1379 | dev->rq_pos = blk_rq_pos(req); |
a0044bdf JD |
1380 | dev->start_sg = 0; |
1381 | dev->end_sg = blk_rq_map_sg(q, req, dev->sg); | |
1382 | } | |
1383 | ||
1384 | req = dev->request; | |
805f11a0 | 1385 | |
3a5e02ce | 1386 | if (req_op(req) == REQ_OP_FLUSH) { |
805f11a0 RW |
1387 | io_req = kmalloc(sizeof(struct io_thread_req), |
1388 | GFP_ATOMIC); | |
1389 | if (io_req == NULL) { | |
1390 | if (list_empty(&dev->restart)) | |
1391 | list_add(&dev->restart, &restart); | |
1392 | return; | |
1393 | } | |
1394 | prepare_flush_request(req, io_req); | |
2a236122 TK |
1395 | if (submit_request(io_req, dev) == false) |
1396 | return; | |
805f11a0 RW |
1397 | } |
1398 | ||
a0044bdf JD |
1399 | while(dev->start_sg < dev->end_sg){ |
1400 | struct scatterlist *sg = &dev->sg[dev->start_sg]; | |
1401 | ||
2adcec21 | 1402 | io_req = kmalloc(sizeof(struct io_thread_req), |
990c5587 | 1403 | GFP_ATOMIC); |
2adcec21 JD |
1404 | if(io_req == NULL){ |
1405 | if(list_empty(&dev->restart)) | |
1406 | list_add(&dev->restart, &restart); | |
1407 | return; | |
1408 | } | |
1409 | prepare_request(req, io_req, | |
47526903 | 1410 | (unsigned long long)dev->rq_pos << 9, |
45711f1a | 1411 | sg->offset, sg->length, sg_page(sg)); |
a0044bdf | 1412 | |
bc1d72e7 | 1413 | if (submit_request(io_req, dev) == false) |
a0044bdf | 1414 | return; |
a0044bdf | 1415 | |
47526903 | 1416 | dev->rq_pos += sg->length >> 9; |
a0044bdf | 1417 | dev->start_sg++; |
1da177e4 | 1418 | } |
a0044bdf JD |
1419 | dev->end_sg = 0; |
1420 | dev->request = NULL; | |
1da177e4 LT |
1421 | } |
1422 | } | |
1423 | ||
a885c8c4 CH |
1424 | static int ubd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
1425 | { | |
7d314e34 | 1426 | struct ubd *ubd_dev = bdev->bd_disk->private_data; |
a885c8c4 CH |
1427 | |
1428 | geo->heads = 128; | |
1429 | geo->sectors = 32; | |
7d314e34 | 1430 | geo->cylinders = ubd_dev->size / (128 * 32 * 512); |
a885c8c4 CH |
1431 | return 0; |
1432 | } | |
1433 | ||
a625c998 | 1434 | static int ubd_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
1435 | unsigned int cmd, unsigned long arg) |
1436 | { | |
a625c998 | 1437 | struct ubd *ubd_dev = bdev->bd_disk->private_data; |
73855e13 | 1438 | u16 ubd_id[ATA_ID_WORDS]; |
1da177e4 LT |
1439 | |
1440 | switch (cmd) { | |
1da177e4 | 1441 | struct cdrom_volctrl volume; |
1da177e4 | 1442 | case HDIO_GET_IDENTITY: |
73855e13 BZ |
1443 | memset(&ubd_id, 0, ATA_ID_WORDS * 2); |
1444 | ubd_id[ATA_ID_CYLS] = ubd_dev->size / (128 * 32 * 512); | |
1445 | ubd_id[ATA_ID_HEADS] = 128; | |
1446 | ubd_id[ATA_ID_SECTORS] = 32; | |
1da177e4 LT |
1447 | if(copy_to_user((char __user *) arg, (char *) &ubd_id, |
1448 | sizeof(ubd_id))) | |
dc764e50 JD |
1449 | return -EFAULT; |
1450 | return 0; | |
b8831a1d | 1451 | |
1da177e4 LT |
1452 | case CDROMVOLREAD: |
1453 | if(copy_from_user(&volume, (char __user *) arg, sizeof(volume))) | |
dc764e50 | 1454 | return -EFAULT; |
1da177e4 LT |
1455 | volume.channel0 = 255; |
1456 | volume.channel1 = 255; | |
1457 | volume.channel2 = 255; | |
1458 | volume.channel3 = 255; | |
1459 | if(copy_to_user((char __user *) arg, &volume, sizeof(volume))) | |
dc764e50 JD |
1460 | return -EFAULT; |
1461 | return 0; | |
1da177e4 | 1462 | } |
dc764e50 | 1463 | return -EINVAL; |
1da177e4 LT |
1464 | } |
1465 | ||
91acb21f | 1466 | static int update_bitmap(struct io_thread_req *req) |
1da177e4 | 1467 | { |
91acb21f | 1468 | int n; |
1da177e4 | 1469 | |
91acb21f | 1470 | if(req->cow_offset == -1) |
dc764e50 | 1471 | return 0; |
1da177e4 | 1472 | |
8c6157b6 AI |
1473 | n = os_pwrite_file(req->fds[1], &req->bitmap_words, |
1474 | sizeof(req->bitmap_words), req->cow_offset); | |
91acb21f JD |
1475 | if(n != sizeof(req->bitmap_words)){ |
1476 | printk("do_io - bitmap update failed, err = %d fd = %d\n", -n, | |
1477 | req->fds[1]); | |
dc764e50 | 1478 | return 1; |
91acb21f | 1479 | } |
1da177e4 | 1480 | |
dc764e50 | 1481 | return 0; |
91acb21f | 1482 | } |
1da177e4 | 1483 | |
5dc62b1b | 1484 | static void do_io(struct io_thread_req *req) |
91acb21f JD |
1485 | { |
1486 | char *buf; | |
1487 | unsigned long len; | |
1488 | int n, nsectors, start, end, bit; | |
91acb21f JD |
1489 | __u64 off; |
1490 | ||
805f11a0 RW |
1491 | if (req->op == UBD_FLUSH) { |
1492 | /* fds[0] is always either the rw image or our cow file */ | |
1493 | n = os_sync_file(req->fds[0]); | |
1494 | if (n != 0) { | |
1495 | printk("do_io - sync failed err = %d " | |
1496 | "fd = %d\n", -n, req->fds[0]); | |
1497 | req->error = 1; | |
1498 | } | |
1499 | return; | |
1500 | } | |
1501 | ||
91acb21f JD |
1502 | nsectors = req->length / req->sectorsize; |
1503 | start = 0; | |
1504 | do { | |
1505 | bit = ubd_test_bit(start, (unsigned char *) &req->sector_mask); | |
1506 | end = start; | |
1507 | while((end < nsectors) && | |
1508 | (ubd_test_bit(end, (unsigned char *) | |
1509 | &req->sector_mask) == bit)) | |
1510 | end++; | |
1511 | ||
1512 | off = req->offset + req->offsets[bit] + | |
1513 | start * req->sectorsize; | |
1514 | len = (end - start) * req->sectorsize; | |
1515 | buf = &req->buffer[start * req->sectorsize]; | |
1516 | ||
91acb21f JD |
1517 | if(req->op == UBD_READ){ |
1518 | n = 0; | |
1519 | do { | |
1520 | buf = &buf[n]; | |
1521 | len -= n; | |
8c6157b6 | 1522 | n = os_pread_file(req->fds[bit], buf, len, off); |
91acb21f JD |
1523 | if (n < 0) { |
1524 | printk("do_io - read failed, err = %d " | |
1525 | "fd = %d\n", -n, req->fds[bit]); | |
1526 | req->error = 1; | |
1527 | return; | |
1528 | } | |
1529 | } while((n < len) && (n != 0)); | |
1530 | if (n < len) memset(&buf[n], 0, len - n); | |
1531 | } else { | |
8c6157b6 | 1532 | n = os_pwrite_file(req->fds[bit], buf, len, off); |
91acb21f JD |
1533 | if(n != len){ |
1534 | printk("do_io - write failed err = %d " | |
1535 | "fd = %d\n", -n, req->fds[bit]); | |
1536 | req->error = 1; | |
1537 | return; | |
1538 | } | |
1539 | } | |
1540 | ||
1541 | start = end; | |
1542 | } while(start < nsectors); | |
1da177e4 | 1543 | |
91acb21f | 1544 | req->error = update_bitmap(req); |
1da177e4 | 1545 | } |
91acb21f JD |
1546 | |
1547 | /* Changed in start_io_thread, which is serialized by being called only | |
1548 | * from ubd_init, which is an initcall. | |
1549 | */ | |
1550 | int kernel_fd = -1; | |
1551 | ||
d8d7c28e PBG |
1552 | /* Only changed by the io thread. XXX: currently unused. */ |
1553 | static int io_count = 0; | |
91acb21f JD |
1554 | |
1555 | int io_thread(void *arg) | |
1556 | { | |
f88f0bdf | 1557 | int n, count, written, res; |
91acb21f | 1558 | |
91d44ff8 RW |
1559 | os_fix_helper_signals(); |
1560 | ||
91acb21f | 1561 | while(1){ |
f88f0bdf AI |
1562 | n = bulk_req_safe_read( |
1563 | kernel_fd, | |
1564 | io_req_buffer, | |
1565 | &io_remainder, | |
1566 | &io_remainder_size, | |
1567 | UBD_REQ_BUFFER_SIZE | |
1568 | ); | |
1569 | if (n < 0) { | |
1570 | if (n == -EAGAIN) { | |
1571 | ubd_read_poll(-1); | |
1572 | continue; | |
1573 | } else { | |
91acb21f | 1574 | printk("io_thread - read failed, fd = %d, " |
f88f0bdf AI |
1575 | "err = %d," |
1576 | "reminder = %d\n", | |
1577 | kernel_fd, -n, io_remainder_size); | |
91acb21f | 1578 | } |
91acb21f | 1579 | } |
f88f0bdf AI |
1580 | |
1581 | for (count = 0; count < n/sizeof(struct io_thread_req *); count++) { | |
1582 | io_count++; | |
1583 | do_io((*io_req_buffer)[count]); | |
1584 | } | |
1585 | ||
1586 | written = 0; | |
1587 | ||
1588 | do { | |
1589 | res = os_write_file(kernel_fd, ((char *) io_req_buffer) + written, n); | |
1590 | if (res > 0) { | |
1591 | written += res; | |
1592 | } else { | |
1593 | if (res != -EAGAIN) { | |
1594 | printk("io_thread - read failed, fd = %d, " | |
1595 | "err = %d\n", kernel_fd, -n); | |
1596 | } | |
1597 | } | |
1598 | if (written < n) { | |
1599 | ubd_write_poll(-1); | |
1600 | } | |
1601 | } while (written < n); | |
91acb21f | 1602 | } |
91acb21f | 1603 | |
1b57e9c2 JD |
1604 | return 0; |
1605 | } |