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3dcf60bc | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * gendisk handling | |
7b51e703 CH |
4 | * |
5 | * Portions Copyright (C) 2020 Christoph Hellwig | |
1da177e4 LT |
6 | */ |
7 | ||
1da177e4 | 8 | #include <linux/module.h> |
3ad5cee5 | 9 | #include <linux/ctype.h> |
1da177e4 LT |
10 | #include <linux/fs.h> |
11 | #include <linux/genhd.h> | |
b446b60e | 12 | #include <linux/kdev_t.h> |
1da177e4 LT |
13 | #include <linux/kernel.h> |
14 | #include <linux/blkdev.h> | |
66114cad | 15 | #include <linux/backing-dev.h> |
1da177e4 LT |
16 | #include <linux/init.h> |
17 | #include <linux/spinlock.h> | |
f500975a | 18 | #include <linux/proc_fs.h> |
1da177e4 LT |
19 | #include <linux/seq_file.h> |
20 | #include <linux/slab.h> | |
21 | #include <linux/kmod.h> | |
58383af6 | 22 | #include <linux/mutex.h> |
bcce3de1 | 23 | #include <linux/idr.h> |
77ea887e | 24 | #include <linux/log2.h> |
25e823c8 | 25 | #include <linux/pm_runtime.h> |
99e6608c | 26 | #include <linux/badblocks.h> |
1da177e4 | 27 | |
ff88972c AB |
28 | #include "blk.h" |
29 | ||
31eb6186 | 30 | static struct kobject *block_depr; |
1da177e4 | 31 | |
22ae8ce8 | 32 | DECLARE_RWSEM(bdev_lookup_sem); |
62b508f8 | 33 | |
bcce3de1 | 34 | /* for extended dynamic devt allocation, currently only one major is used */ |
ce23bba8 | 35 | #define NR_EXT_DEVT (1 << MINORBITS) |
22ae8ce8 | 36 | static DEFINE_IDA(ext_devt_ida); |
bcce3de1 | 37 | |
12c2bdb2 DB |
38 | static void disk_check_events(struct disk_events *ev, |
39 | unsigned int *clearing_ptr); | |
9f53d2fe | 40 | static void disk_alloc_events(struct gendisk *disk); |
77ea887e TH |
41 | static void disk_add_events(struct gendisk *disk); |
42 | static void disk_del_events(struct gendisk *disk); | |
43 | static void disk_release_events(struct gendisk *disk); | |
44 | ||
a782483c CH |
45 | void set_capacity(struct gendisk *disk, sector_t sectors) |
46 | { | |
cb8432d6 | 47 | struct block_device *bdev = disk->part0; |
0fe37724 | 48 | unsigned long flags; |
a782483c | 49 | |
0fe37724 | 50 | spin_lock_irqsave(&bdev->bd_size_lock, flags); |
a782483c | 51 | i_size_write(bdev->bd_inode, (loff_t)sectors << SECTOR_SHIFT); |
0fe37724 | 52 | spin_unlock_irqrestore(&bdev->bd_size_lock, flags); |
a782483c CH |
53 | } |
54 | EXPORT_SYMBOL(set_capacity); | |
55 | ||
e598a72f | 56 | /* |
449f4ec9 CH |
57 | * Set disk capacity and notify if the size is not currently zero and will not |
58 | * be set to zero. Returns true if a uevent was sent, otherwise false. | |
e598a72f | 59 | */ |
449f4ec9 | 60 | bool set_capacity_and_notify(struct gendisk *disk, sector_t size) |
e598a72f BS |
61 | { |
62 | sector_t capacity = get_capacity(disk); | |
a782483c | 63 | char *envp[] = { "RESIZE=1", NULL }; |
e598a72f BS |
64 | |
65 | set_capacity(disk, size); | |
e598a72f | 66 | |
a782483c CH |
67 | /* |
68 | * Only print a message and send a uevent if the gendisk is user visible | |
69 | * and alive. This avoids spamming the log and udev when setting the | |
70 | * initial capacity during probing. | |
71 | */ | |
72 | if (size == capacity || | |
73 | (disk->flags & (GENHD_FL_UP | GENHD_FL_HIDDEN)) != GENHD_FL_UP) | |
74 | return false; | |
e598a72f | 75 | |
a782483c CH |
76 | pr_info("%s: detected capacity change from %lld to %lld\n", |
77 | disk->disk_name, size, capacity); | |
7e890c37 | 78 | |
a782483c CH |
79 | /* |
80 | * Historically we did not send a uevent for changes to/from an empty | |
81 | * device. | |
82 | */ | |
83 | if (!capacity || !size) | |
84 | return false; | |
85 | kobject_uevent_env(&disk_to_dev(disk)->kobj, KOBJ_CHANGE, envp); | |
86 | return true; | |
e598a72f | 87 | } |
449f4ec9 | 88 | EXPORT_SYMBOL_GPL(set_capacity_and_notify); |
e598a72f | 89 | |
5cbd28e3 CH |
90 | /* |
91 | * Format the device name of the indicated disk into the supplied buffer and | |
92 | * return a pointer to that same buffer for convenience. | |
93 | */ | |
94 | char *disk_name(struct gendisk *hd, int partno, char *buf) | |
95 | { | |
96 | if (!partno) | |
97 | snprintf(buf, BDEVNAME_SIZE, "%s", hd->disk_name); | |
98 | else if (isdigit(hd->disk_name[strlen(hd->disk_name)-1])) | |
99 | snprintf(buf, BDEVNAME_SIZE, "%sp%d", hd->disk_name, partno); | |
100 | else | |
101 | snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, partno); | |
102 | ||
103 | return buf; | |
104 | } | |
105 | ||
106 | const char *bdevname(struct block_device *bdev, char *buf) | |
107 | { | |
8a63a86e | 108 | return disk_name(bdev->bd_disk, bdev->bd_partno, buf); |
5cbd28e3 CH |
109 | } |
110 | EXPORT_SYMBOL(bdevname); | |
e598a72f | 111 | |
0d02129e CH |
112 | static void part_stat_read_all(struct block_device *part, |
113 | struct disk_stats *stat) | |
ea18e0f0 KK |
114 | { |
115 | int cpu; | |
116 | ||
117 | memset(stat, 0, sizeof(struct disk_stats)); | |
118 | for_each_possible_cpu(cpu) { | |
0d02129e | 119 | struct disk_stats *ptr = per_cpu_ptr(part->bd_stats, cpu); |
ea18e0f0 KK |
120 | int group; |
121 | ||
122 | for (group = 0; group < NR_STAT_GROUPS; group++) { | |
123 | stat->nsecs[group] += ptr->nsecs[group]; | |
124 | stat->sectors[group] += ptr->sectors[group]; | |
125 | stat->ios[group] += ptr->ios[group]; | |
126 | stat->merges[group] += ptr->merges[group]; | |
127 | } | |
128 | ||
129 | stat->io_ticks += ptr->io_ticks; | |
ea18e0f0 KK |
130 | } |
131 | } | |
ea18e0f0 | 132 | |
8446fe92 | 133 | static unsigned int part_in_flight(struct block_device *part) |
f299b7c7 | 134 | { |
b2f609e1 | 135 | unsigned int inflight = 0; |
1226b8dd | 136 | int cpu; |
f299b7c7 | 137 | |
1226b8dd | 138 | for_each_possible_cpu(cpu) { |
e016b782 MP |
139 | inflight += part_stat_local_read_cpu(part, in_flight[0], cpu) + |
140 | part_stat_local_read_cpu(part, in_flight[1], cpu); | |
1226b8dd | 141 | } |
e016b782 MP |
142 | if ((int)inflight < 0) |
143 | inflight = 0; | |
1226b8dd | 144 | |
e016b782 | 145 | return inflight; |
f299b7c7 JA |
146 | } |
147 | ||
8446fe92 CH |
148 | static void part_in_flight_rw(struct block_device *part, |
149 | unsigned int inflight[2]) | |
bf0ddaba | 150 | { |
1226b8dd MP |
151 | int cpu; |
152 | ||
1226b8dd MP |
153 | inflight[0] = 0; |
154 | inflight[1] = 0; | |
155 | for_each_possible_cpu(cpu) { | |
156 | inflight[0] += part_stat_local_read_cpu(part, in_flight[0], cpu); | |
157 | inflight[1] += part_stat_local_read_cpu(part, in_flight[1], cpu); | |
158 | } | |
159 | if ((int)inflight[0] < 0) | |
160 | inflight[0] = 0; | |
161 | if ((int)inflight[1] < 0) | |
162 | inflight[1] = 0; | |
bf0ddaba OS |
163 | } |
164 | ||
e71bf0d0 TH |
165 | /** |
166 | * disk_part_iter_init - initialize partition iterator | |
167 | * @piter: iterator to initialize | |
168 | * @disk: disk to iterate over | |
169 | * @flags: DISK_PITER_* flags | |
170 | * | |
171 | * Initialize @piter so that it iterates over partitions of @disk. | |
172 | * | |
173 | * CONTEXT: | |
174 | * Don't care. | |
175 | */ | |
176 | void disk_part_iter_init(struct disk_part_iter *piter, struct gendisk *disk, | |
177 | unsigned int flags) | |
178 | { | |
179 | piter->disk = disk; | |
180 | piter->part = NULL; | |
0470dd9d | 181 | if (flags & (DISK_PITER_INCL_PART0 | DISK_PITER_INCL_EMPTY_PART0)) |
e71bf0d0 | 182 | piter->idx = 0; |
b5d0b9df TH |
183 | else |
184 | piter->idx = 1; | |
e71bf0d0 TH |
185 | piter->flags = flags; |
186 | } | |
e71bf0d0 TH |
187 | |
188 | /** | |
189 | * disk_part_iter_next - proceed iterator to the next partition and return it | |
190 | * @piter: iterator of interest | |
191 | * | |
192 | * Proceed @piter to the next partition and return it. | |
193 | * | |
194 | * CONTEXT: | |
195 | * Don't care. | |
196 | */ | |
ad1eaa53 | 197 | struct block_device *disk_part_iter_next(struct disk_part_iter *piter) |
e71bf0d0 | 198 | { |
a33df75c CH |
199 | struct block_device *part; |
200 | unsigned long idx; | |
e71bf0d0 TH |
201 | |
202 | /* put the last partition */ | |
e79319af | 203 | disk_part_iter_exit(piter); |
e71bf0d0 TH |
204 | |
205 | rcu_read_lock(); | |
a33df75c | 206 | xa_for_each_start(&piter->disk->part_tbl, idx, part, piter->idx) { |
8446fe92 | 207 | if (!bdev_nr_sectors(part) && |
71982a40 TH |
208 | !(piter->flags & DISK_PITER_INCL_EMPTY) && |
209 | !(piter->flags & DISK_PITER_INCL_EMPTY_PART0 && | |
a33df75c | 210 | piter->idx == 0)) |
e71bf0d0 TH |
211 | continue; |
212 | ||
0470dd9d CH |
213 | piter->part = bdgrab(part); |
214 | if (!piter->part) | |
215 | continue; | |
a33df75c | 216 | piter->idx = idx + 1; |
e71bf0d0 TH |
217 | break; |
218 | } | |
e71bf0d0 TH |
219 | rcu_read_unlock(); |
220 | ||
221 | return piter->part; | |
222 | } | |
e71bf0d0 TH |
223 | |
224 | /** | |
225 | * disk_part_iter_exit - finish up partition iteration | |
226 | * @piter: iter of interest | |
227 | * | |
228 | * Called when iteration is over. Cleans up @piter. | |
229 | * | |
230 | * CONTEXT: | |
231 | * Don't care. | |
232 | */ | |
233 | void disk_part_iter_exit(struct disk_part_iter *piter) | |
234 | { | |
ad1eaa53 CH |
235 | if (piter->part) |
236 | bdput(piter->part); | |
e71bf0d0 TH |
237 | piter->part = NULL; |
238 | } | |
b53df2e7 | 239 | |
1da177e4 LT |
240 | /* |
241 | * Can be deleted altogether. Later. | |
242 | * | |
243 | */ | |
133d55cd | 244 | #define BLKDEV_MAJOR_HASH_SIZE 255 |
1da177e4 LT |
245 | static struct blk_major_name { |
246 | struct blk_major_name *next; | |
247 | int major; | |
248 | char name[16]; | |
a160c615 | 249 | void (*probe)(dev_t devt); |
68eef3b4 | 250 | } *major_names[BLKDEV_MAJOR_HASH_SIZE]; |
e49fbbbf | 251 | static DEFINE_MUTEX(major_names_lock); |
1da177e4 LT |
252 | |
253 | /* index in the above - for now: assume no multimajor ranges */ | |
e61eb2e9 | 254 | static inline int major_to_index(unsigned major) |
1da177e4 | 255 | { |
68eef3b4 | 256 | return major % BLKDEV_MAJOR_HASH_SIZE; |
7170be5f NH |
257 | } |
258 | ||
68eef3b4 | 259 | #ifdef CONFIG_PROC_FS |
cf771cb5 | 260 | void blkdev_show(struct seq_file *seqf, off_t offset) |
7170be5f | 261 | { |
68eef3b4 | 262 | struct blk_major_name *dp; |
7170be5f | 263 | |
e49fbbbf | 264 | mutex_lock(&major_names_lock); |
133d55cd LG |
265 | for (dp = major_names[major_to_index(offset)]; dp; dp = dp->next) |
266 | if (dp->major == offset) | |
cf771cb5 | 267 | seq_printf(seqf, "%3d %s\n", dp->major, dp->name); |
e49fbbbf | 268 | mutex_unlock(&major_names_lock); |
1da177e4 | 269 | } |
68eef3b4 | 270 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 271 | |
9e8c0bcc | 272 | /** |
e2b6b301 | 273 | * __register_blkdev - register a new block device |
9e8c0bcc | 274 | * |
f33ff110 SB |
275 | * @major: the requested major device number [1..BLKDEV_MAJOR_MAX-1]. If |
276 | * @major = 0, try to allocate any unused major number. | |
9e8c0bcc | 277 | * @name: the name of the new block device as a zero terminated string |
e2b6b301 | 278 | * @probe: allback that is called on access to any minor number of @major |
9e8c0bcc MN |
279 | * |
280 | * The @name must be unique within the system. | |
281 | * | |
0e056eb5 | 282 | * The return value depends on the @major input parameter: |
283 | * | |
f33ff110 SB |
284 | * - if a major device number was requested in range [1..BLKDEV_MAJOR_MAX-1] |
285 | * then the function returns zero on success, or a negative error code | |
0e056eb5 | 286 | * - if any unused major number was requested with @major = 0 parameter |
9e8c0bcc | 287 | * then the return value is the allocated major number in range |
f33ff110 SB |
288 | * [1..BLKDEV_MAJOR_MAX-1] or a negative error code otherwise |
289 | * | |
290 | * See Documentation/admin-guide/devices.txt for the list of allocated | |
291 | * major numbers. | |
e2b6b301 CH |
292 | * |
293 | * Use register_blkdev instead for any new code. | |
9e8c0bcc | 294 | */ |
a160c615 CH |
295 | int __register_blkdev(unsigned int major, const char *name, |
296 | void (*probe)(dev_t devt)) | |
1da177e4 LT |
297 | { |
298 | struct blk_major_name **n, *p; | |
299 | int index, ret = 0; | |
300 | ||
e49fbbbf | 301 | mutex_lock(&major_names_lock); |
1da177e4 LT |
302 | |
303 | /* temporary */ | |
304 | if (major == 0) { | |
305 | for (index = ARRAY_SIZE(major_names)-1; index > 0; index--) { | |
306 | if (major_names[index] == NULL) | |
307 | break; | |
308 | } | |
309 | ||
310 | if (index == 0) { | |
dfc76d11 KP |
311 | printk("%s: failed to get major for %s\n", |
312 | __func__, name); | |
1da177e4 LT |
313 | ret = -EBUSY; |
314 | goto out; | |
315 | } | |
316 | major = index; | |
317 | ret = major; | |
318 | } | |
319 | ||
133d55cd | 320 | if (major >= BLKDEV_MAJOR_MAX) { |
dfc76d11 KP |
321 | pr_err("%s: major requested (%u) is greater than the maximum (%u) for %s\n", |
322 | __func__, major, BLKDEV_MAJOR_MAX-1, name); | |
133d55cd LG |
323 | |
324 | ret = -EINVAL; | |
325 | goto out; | |
326 | } | |
327 | ||
1da177e4 LT |
328 | p = kmalloc(sizeof(struct blk_major_name), GFP_KERNEL); |
329 | if (p == NULL) { | |
330 | ret = -ENOMEM; | |
331 | goto out; | |
332 | } | |
333 | ||
334 | p->major = major; | |
a160c615 | 335 | p->probe = probe; |
1da177e4 LT |
336 | strlcpy(p->name, name, sizeof(p->name)); |
337 | p->next = NULL; | |
338 | index = major_to_index(major); | |
339 | ||
340 | for (n = &major_names[index]; *n; n = &(*n)->next) { | |
341 | if ((*n)->major == major) | |
342 | break; | |
343 | } | |
344 | if (!*n) | |
345 | *n = p; | |
346 | else | |
347 | ret = -EBUSY; | |
348 | ||
349 | if (ret < 0) { | |
f33ff110 | 350 | printk("register_blkdev: cannot get major %u for %s\n", |
1da177e4 LT |
351 | major, name); |
352 | kfree(p); | |
353 | } | |
354 | out: | |
e49fbbbf | 355 | mutex_unlock(&major_names_lock); |
1da177e4 LT |
356 | return ret; |
357 | } | |
a160c615 | 358 | EXPORT_SYMBOL(__register_blkdev); |
1da177e4 | 359 | |
f4480240 | 360 | void unregister_blkdev(unsigned int major, const char *name) |
1da177e4 LT |
361 | { |
362 | struct blk_major_name **n; | |
363 | struct blk_major_name *p = NULL; | |
364 | int index = major_to_index(major); | |
1da177e4 | 365 | |
e49fbbbf | 366 | mutex_lock(&major_names_lock); |
1da177e4 LT |
367 | for (n = &major_names[index]; *n; n = &(*n)->next) |
368 | if ((*n)->major == major) | |
369 | break; | |
294462a5 AM |
370 | if (!*n || strcmp((*n)->name, name)) { |
371 | WARN_ON(1); | |
294462a5 | 372 | } else { |
1da177e4 LT |
373 | p = *n; |
374 | *n = p->next; | |
375 | } | |
e49fbbbf | 376 | mutex_unlock(&major_names_lock); |
1da177e4 | 377 | kfree(p); |
1da177e4 LT |
378 | } |
379 | ||
380 | EXPORT_SYMBOL(unregister_blkdev); | |
381 | ||
870d6656 TH |
382 | /** |
383 | * blk_mangle_minor - scatter minor numbers apart | |
384 | * @minor: minor number to mangle | |
385 | * | |
386 | * Scatter consecutively allocated @minor number apart if MANGLE_DEVT | |
387 | * is enabled. Mangling twice gives the original value. | |
388 | * | |
389 | * RETURNS: | |
390 | * Mangled value. | |
391 | * | |
392 | * CONTEXT: | |
393 | * Don't care. | |
394 | */ | |
395 | static int blk_mangle_minor(int minor) | |
396 | { | |
397 | #ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT | |
398 | int i; | |
399 | ||
400 | for (i = 0; i < MINORBITS / 2; i++) { | |
401 | int low = minor & (1 << i); | |
402 | int high = minor & (1 << (MINORBITS - 1 - i)); | |
403 | int distance = MINORBITS - 1 - 2 * i; | |
404 | ||
405 | minor ^= low | high; /* clear both bits */ | |
406 | low <<= distance; /* swap the positions */ | |
407 | high >>= distance; | |
408 | minor |= low | high; /* and set */ | |
409 | } | |
410 | #endif | |
411 | return minor; | |
412 | } | |
413 | ||
bcce3de1 | 414 | /** |
9fc995a6 CH |
415 | * blk_alloc_devt - allocate a dev_t for a block device |
416 | * @bdev: block device to allocate dev_t for | |
bcce3de1 TH |
417 | * @devt: out parameter for resulting dev_t |
418 | * | |
419 | * Allocate a dev_t for block device. | |
420 | * | |
421 | * RETURNS: | |
422 | * 0 on success, allocated dev_t is returned in *@devt. -errno on | |
423 | * failure. | |
424 | * | |
425 | * CONTEXT: | |
426 | * Might sleep. | |
427 | */ | |
9fc995a6 | 428 | int blk_alloc_devt(struct block_device *bdev, dev_t *devt) |
bcce3de1 | 429 | { |
9fc995a6 | 430 | struct gendisk *disk = bdev->bd_disk; |
bab998d6 | 431 | int idx; |
bcce3de1 TH |
432 | |
433 | /* in consecutive minor range? */ | |
9fc995a6 CH |
434 | if (bdev->bd_partno < disk->minors) { |
435 | *devt = MKDEV(disk->major, disk->first_minor + bdev->bd_partno); | |
bcce3de1 TH |
436 | return 0; |
437 | } | |
438 | ||
22ae8ce8 | 439 | idx = ida_alloc_range(&ext_devt_ida, 0, NR_EXT_DEVT, GFP_KERNEL); |
bab998d6 TH |
440 | if (idx < 0) |
441 | return idx == -ENOSPC ? -EBUSY : idx; | |
bcce3de1 | 442 | |
870d6656 | 443 | *devt = MKDEV(BLOCK_EXT_MAJOR, blk_mangle_minor(idx)); |
bcce3de1 TH |
444 | return 0; |
445 | } | |
446 | ||
447 | /** | |
448 | * blk_free_devt - free a dev_t | |
449 | * @devt: dev_t to free | |
450 | * | |
451 | * Free @devt which was allocated using blk_alloc_devt(). | |
452 | * | |
453 | * CONTEXT: | |
454 | * Might sleep. | |
455 | */ | |
456 | void blk_free_devt(dev_t devt) | |
457 | { | |
22ae8ce8 CH |
458 | if (MAJOR(devt) == BLOCK_EXT_MAJOR) |
459 | ida_free(&ext_devt_ida, blk_mangle_minor(MINOR(devt))); | |
6fcc44d1 YY |
460 | } |
461 | ||
1f014290 TH |
462 | static char *bdevt_str(dev_t devt, char *buf) |
463 | { | |
464 | if (MAJOR(devt) <= 0xff && MINOR(devt) <= 0xff) { | |
465 | char tbuf[BDEVT_SIZE]; | |
466 | snprintf(tbuf, BDEVT_SIZE, "%02x%02x", MAJOR(devt), MINOR(devt)); | |
467 | snprintf(buf, BDEVT_SIZE, "%-9s", tbuf); | |
468 | } else | |
469 | snprintf(buf, BDEVT_SIZE, "%03x:%05x", MAJOR(devt), MINOR(devt)); | |
470 | ||
471 | return buf; | |
472 | } | |
473 | ||
bc359d03 CH |
474 | void disk_uevent(struct gendisk *disk, enum kobject_action action) |
475 | { | |
476 | struct disk_part_iter piter; | |
477 | struct block_device *part; | |
478 | ||
479 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); | |
480 | while ((part = disk_part_iter_next(&piter))) | |
481 | kobject_uevent(bdev_kobj(part), action); | |
482 | disk_part_iter_exit(&piter); | |
483 | } | |
484 | EXPORT_SYMBOL_GPL(disk_uevent); | |
485 | ||
9301fe73 CH |
486 | static void disk_scan_partitions(struct gendisk *disk) |
487 | { | |
488 | struct block_device *bdev; | |
489 | ||
490 | if (!get_capacity(disk) || !disk_part_scan_enabled(disk)) | |
491 | return; | |
492 | ||
493 | set_bit(GD_NEED_PART_SCAN, &disk->state); | |
494 | bdev = blkdev_get_by_dev(disk_devt(disk), FMODE_READ, NULL); | |
495 | if (!IS_ERR(bdev)) | |
496 | blkdev_put(bdev, FMODE_READ); | |
497 | } | |
498 | ||
fef912bf HR |
499 | static void register_disk(struct device *parent, struct gendisk *disk, |
500 | const struct attribute_group **groups) | |
d2bf1b67 TH |
501 | { |
502 | struct device *ddev = disk_to_dev(disk); | |
d2bf1b67 TH |
503 | int err; |
504 | ||
e63a46be | 505 | ddev->parent = parent; |
d2bf1b67 | 506 | |
ffc8b308 | 507 | dev_set_name(ddev, "%s", disk->disk_name); |
d2bf1b67 TH |
508 | |
509 | /* delay uevents, until we scanned partition table */ | |
510 | dev_set_uevent_suppress(ddev, 1); | |
511 | ||
fef912bf HR |
512 | if (groups) { |
513 | WARN_ON(ddev->groups); | |
514 | ddev->groups = groups; | |
515 | } | |
d2bf1b67 TH |
516 | if (device_add(ddev)) |
517 | return; | |
518 | if (!sysfs_deprecated) { | |
519 | err = sysfs_create_link(block_depr, &ddev->kobj, | |
520 | kobject_name(&ddev->kobj)); | |
521 | if (err) { | |
522 | device_del(ddev); | |
523 | return; | |
524 | } | |
525 | } | |
25e823c8 ML |
526 | |
527 | /* | |
528 | * avoid probable deadlock caused by allocating memory with | |
529 | * GFP_KERNEL in runtime_resume callback of its all ancestor | |
530 | * devices | |
531 | */ | |
532 | pm_runtime_set_memalloc_noio(ddev, true); | |
533 | ||
cb8432d6 CH |
534 | disk->part0->bd_holder_dir = |
535 | kobject_create_and_add("holders", &ddev->kobj); | |
d2bf1b67 TH |
536 | disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj); |
537 | ||
8ddcd653 CH |
538 | if (disk->flags & GENHD_FL_HIDDEN) { |
539 | dev_set_uevent_suppress(ddev, 0); | |
540 | return; | |
541 | } | |
542 | ||
9301fe73 | 543 | disk_scan_partitions(disk); |
d2bf1b67 | 544 | |
bc359d03 | 545 | /* announce the disk and partitions after all partitions are created */ |
d2bf1b67 | 546 | dev_set_uevent_suppress(ddev, 0); |
bc359d03 | 547 | disk_uevent(disk, KOBJ_ADD); |
8ddcd653 | 548 | |
4d7c1d3f | 549 | if (disk->queue->backing_dev_info->dev) { |
550 | err = sysfs_create_link(&ddev->kobj, | |
551 | &disk->queue->backing_dev_info->dev->kobj, | |
552 | "bdi"); | |
553 | WARN_ON(err); | |
554 | } | |
d2bf1b67 TH |
555 | } |
556 | ||
1da177e4 | 557 | /** |
fa70d2e2 | 558 | * __device_add_disk - add disk information to kernel list |
e63a46be | 559 | * @parent: parent device for the disk |
1da177e4 | 560 | * @disk: per-device partitioning information |
fef912bf | 561 | * @groups: Additional per-device sysfs groups |
fa70d2e2 | 562 | * @register_queue: register the queue if set to true |
1da177e4 LT |
563 | * |
564 | * This function registers the partitioning information in @disk | |
565 | * with the kernel. | |
3e1a7ff8 TH |
566 | * |
567 | * FIXME: error handling | |
1da177e4 | 568 | */ |
fa70d2e2 | 569 | static void __device_add_disk(struct device *parent, struct gendisk *disk, |
fef912bf | 570 | const struct attribute_group **groups, |
fa70d2e2 | 571 | bool register_queue) |
1da177e4 | 572 | { |
3e1a7ff8 | 573 | dev_t devt; |
6ffeea77 | 574 | int retval; |
cf0ca9fe | 575 | |
737eb78e DLM |
576 | /* |
577 | * The disk queue should now be all set with enough information about | |
578 | * the device for the elevator code to pick an adequate default | |
579 | * elevator if one is needed, that is, for devices requesting queue | |
580 | * registration. | |
581 | */ | |
582 | if (register_queue) | |
583 | elevator_init_mq(disk->queue); | |
584 | ||
3e1a7ff8 TH |
585 | /* minors == 0 indicates to use ext devt from part0 and should |
586 | * be accompanied with EXT_DEVT flag. Make sure all | |
587 | * parameters make sense. | |
588 | */ | |
589 | WARN_ON(disk->minors && !(disk->major || disk->first_minor)); | |
8ddcd653 CH |
590 | WARN_ON(!disk->minors && |
591 | !(disk->flags & (GENHD_FL_EXT_DEVT | GENHD_FL_HIDDEN))); | |
3e1a7ff8 | 592 | |
1da177e4 | 593 | disk->flags |= GENHD_FL_UP; |
3e1a7ff8 | 594 | |
9fc995a6 | 595 | retval = blk_alloc_devt(disk->part0, &devt); |
3e1a7ff8 TH |
596 | if (retval) { |
597 | WARN_ON(1); | |
598 | return; | |
599 | } | |
3e1a7ff8 TH |
600 | disk->major = MAJOR(devt); |
601 | disk->first_minor = MINOR(devt); | |
602 | ||
9f53d2fe SG |
603 | disk_alloc_events(disk); |
604 | ||
8ddcd653 CH |
605 | if (disk->flags & GENHD_FL_HIDDEN) { |
606 | /* | |
607 | * Don't let hidden disks show up in /proc/partitions, | |
608 | * and don't bother scanning for partitions either. | |
609 | */ | |
610 | disk->flags |= GENHD_FL_SUPPRESS_PARTITION_INFO; | |
611 | disk->flags |= GENHD_FL_NO_PART_SCAN; | |
612 | } else { | |
3c5d202b CH |
613 | struct backing_dev_info *bdi = disk->queue->backing_dev_info; |
614 | struct device *dev = disk_to_dev(disk); | |
3a92168b | 615 | int ret; |
616 | ||
8ddcd653 | 617 | /* Register BDI before referencing it from bdev */ |
3c5d202b CH |
618 | dev->devt = devt; |
619 | ret = bdi_register(bdi, "%u:%u", MAJOR(devt), MINOR(devt)); | |
3a92168b | 620 | WARN_ON(ret); |
3c5d202b | 621 | bdi_set_owner(bdi, dev); |
cb8432d6 | 622 | bdev_add(disk->part0, devt); |
8ddcd653 | 623 | } |
fef912bf | 624 | register_disk(parent, disk, groups); |
fa70d2e2 MS |
625 | if (register_queue) |
626 | blk_register_queue(disk); | |
cf0ca9fe | 627 | |
523e1d39 TH |
628 | /* |
629 | * Take an extra ref on queue which will be put on disk_release() | |
630 | * so that it sticks around as long as @disk is there. | |
631 | */ | |
09ac46c4 | 632 | WARN_ON_ONCE(!blk_get_queue(disk->queue)); |
523e1d39 | 633 | |
77ea887e | 634 | disk_add_events(disk); |
25520d55 | 635 | blk_integrity_add(disk); |
1da177e4 | 636 | } |
fa70d2e2 | 637 | |
fef912bf HR |
638 | void device_add_disk(struct device *parent, struct gendisk *disk, |
639 | const struct attribute_group **groups) | |
640 | ||
fa70d2e2 | 641 | { |
fef912bf | 642 | __device_add_disk(parent, disk, groups, true); |
fa70d2e2 | 643 | } |
e63a46be | 644 | EXPORT_SYMBOL(device_add_disk); |
1da177e4 | 645 | |
fa70d2e2 MS |
646 | void device_add_disk_no_queue_reg(struct device *parent, struct gendisk *disk) |
647 | { | |
fef912bf | 648 | __device_add_disk(parent, disk, NULL, false); |
fa70d2e2 MS |
649 | } |
650 | EXPORT_SYMBOL(device_add_disk_no_queue_reg); | |
651 | ||
71773cf7 | 652 | static void invalidate_partition(struct block_device *bdev) |
02d33b67 | 653 | { |
02d33b67 CH |
654 | fsync_bdev(bdev); |
655 | __invalidate_device(bdev, true); | |
9bc5c397 CH |
656 | |
657 | /* | |
22ae8ce8 CH |
658 | * Unhash the bdev inode for this device so that it can't be looked |
659 | * up any more even if openers still hold references to it. | |
9bc5c397 CH |
660 | */ |
661 | remove_inode_hash(bdev->bd_inode); | |
02d33b67 CH |
662 | } |
663 | ||
b5bd357c LC |
664 | /** |
665 | * del_gendisk - remove the gendisk | |
666 | * @disk: the struct gendisk to remove | |
667 | * | |
668 | * Removes the gendisk and all its associated resources. This deletes the | |
669 | * partitions associated with the gendisk, and unregisters the associated | |
670 | * request_queue. | |
671 | * | |
672 | * This is the counter to the respective __device_add_disk() call. | |
673 | * | |
674 | * The final removal of the struct gendisk happens when its refcount reaches 0 | |
675 | * with put_disk(), which should be called after del_gendisk(), if | |
676 | * __device_add_disk() was used. | |
e8c7d14a LC |
677 | * |
678 | * Drivers exist which depend on the release of the gendisk to be synchronous, | |
679 | * it should not be deferred. | |
680 | * | |
681 | * Context: can sleep | |
b5bd357c | 682 | */ |
d2bf1b67 | 683 | void del_gendisk(struct gendisk *disk) |
1da177e4 | 684 | { |
d2bf1b67 | 685 | struct disk_part_iter piter; |
ad1eaa53 | 686 | struct block_device *part; |
d2bf1b67 | 687 | |
e8c7d14a LC |
688 | might_sleep(); |
689 | ||
6b3ba976 CH |
690 | if (WARN_ON_ONCE(!disk->queue)) |
691 | return; | |
692 | ||
25520d55 | 693 | blk_integrity_del(disk); |
77ea887e TH |
694 | disk_del_events(disk); |
695 | ||
56c0908c JK |
696 | /* |
697 | * Block lookups of the disk until all bdevs are unhashed and the | |
698 | * disk is marked as dead (GENHD_FL_UP cleared). | |
699 | */ | |
22ae8ce8 CH |
700 | down_write(&bdev_lookup_sem); |
701 | ||
d2bf1b67 | 702 | /* invalidate stuff */ |
0470dd9d | 703 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY); |
d2bf1b67 | 704 | while ((part = disk_part_iter_next(&piter))) { |
ad1eaa53 | 705 | invalidate_partition(part); |
0d02129e | 706 | delete_partition(part); |
d2bf1b67 TH |
707 | } |
708 | disk_part_iter_exit(&piter); | |
709 | ||
71773cf7 | 710 | invalidate_partition(disk->part0); |
d2bf1b67 TH |
711 | set_capacity(disk, 0); |
712 | disk->flags &= ~GENHD_FL_UP; | |
22ae8ce8 | 713 | up_write(&bdev_lookup_sem); |
d2bf1b67 | 714 | |
6b3ba976 | 715 | if (!(disk->flags & GENHD_FL_HIDDEN)) { |
8ddcd653 | 716 | sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi"); |
6b3ba976 | 717 | |
90f16fdd JK |
718 | /* |
719 | * Unregister bdi before releasing device numbers (as they can | |
720 | * get reused and we'd get clashes in sysfs). | |
721 | */ | |
6b3ba976 | 722 | bdi_unregister(disk->queue->backing_dev_info); |
90f16fdd | 723 | } |
d2bf1b67 | 724 | |
6b3ba976 | 725 | blk_unregister_queue(disk); |
d2bf1b67 | 726 | |
cb8432d6 | 727 | kobject_put(disk->part0->bd_holder_dir); |
d2bf1b67 | 728 | kobject_put(disk->slave_dir); |
d2bf1b67 | 729 | |
8446fe92 | 730 | part_stat_set_all(disk->part0, 0); |
cb8432d6 | 731 | disk->part0->bd_stamp = 0; |
d2bf1b67 TH |
732 | if (!sysfs_deprecated) |
733 | sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk))); | |
25e823c8 | 734 | pm_runtime_set_memalloc_noio(disk_to_dev(disk), false); |
d2bf1b67 | 735 | device_del(disk_to_dev(disk)); |
1da177e4 | 736 | } |
d2bf1b67 | 737 | EXPORT_SYMBOL(del_gendisk); |
1da177e4 | 738 | |
99e6608c VV |
739 | /* sysfs access to bad-blocks list. */ |
740 | static ssize_t disk_badblocks_show(struct device *dev, | |
741 | struct device_attribute *attr, | |
742 | char *page) | |
743 | { | |
744 | struct gendisk *disk = dev_to_disk(dev); | |
745 | ||
746 | if (!disk->bb) | |
747 | return sprintf(page, "\n"); | |
748 | ||
749 | return badblocks_show(disk->bb, page, 0); | |
750 | } | |
751 | ||
752 | static ssize_t disk_badblocks_store(struct device *dev, | |
753 | struct device_attribute *attr, | |
754 | const char *page, size_t len) | |
755 | { | |
756 | struct gendisk *disk = dev_to_disk(dev); | |
757 | ||
758 | if (!disk->bb) | |
759 | return -ENXIO; | |
760 | ||
761 | return badblocks_store(disk->bb, page, len, 0); | |
762 | } | |
763 | ||
22ae8ce8 | 764 | void blk_request_module(dev_t devt) |
bd8eff3b | 765 | { |
a160c615 CH |
766 | unsigned int major = MAJOR(devt); |
767 | struct blk_major_name **n; | |
768 | ||
769 | mutex_lock(&major_names_lock); | |
770 | for (n = &major_names[major_to_index(major)]; *n; n = &(*n)->next) { | |
771 | if ((*n)->major == major && (*n)->probe) { | |
772 | (*n)->probe(devt); | |
773 | mutex_unlock(&major_names_lock); | |
774 | return; | |
775 | } | |
776 | } | |
777 | mutex_unlock(&major_names_lock); | |
778 | ||
bd8eff3b CH |
779 | if (request_module("block-major-%d-%d", MAJOR(devt), MINOR(devt)) > 0) |
780 | /* Make old-style 2.4 aliases work */ | |
781 | request_module("block-major-%d", MAJOR(devt)); | |
782 | } | |
783 | ||
f331c029 TH |
784 | /** |
785 | * bdget_disk - do bdget() by gendisk and partition number | |
786 | * @disk: gendisk of interest | |
787 | * @partno: partition number | |
788 | * | |
789 | * Find partition @partno from @disk, do bdget() on it. | |
790 | * | |
791 | * CONTEXT: | |
792 | * Don't care. | |
793 | * | |
794 | * RETURNS: | |
795 | * Resulting block_device on success, NULL on failure. | |
796 | */ | |
aeb3d3a8 | 797 | struct block_device *bdget_disk(struct gendisk *disk, int partno) |
f331c029 | 798 | { |
548b10eb | 799 | struct block_device *bdev = NULL; |
f331c029 | 800 | |
0d02129e | 801 | rcu_read_lock(); |
a33df75c | 802 | bdev = xa_load(&disk->part_tbl, partno); |
0d02129e CH |
803 | if (bdev && !bdgrab(bdev)) |
804 | bdev = NULL; | |
805 | rcu_read_unlock(); | |
f331c029 | 806 | |
548b10eb | 807 | return bdev; |
f331c029 | 808 | } |
f331c029 | 809 | |
5c6f35c5 GKH |
810 | /* |
811 | * print a full list of all partitions - intended for places where the root | |
812 | * filesystem can't be mounted and thus to give the victim some idea of what | |
813 | * went wrong | |
814 | */ | |
815 | void __init printk_all_partitions(void) | |
816 | { | |
def4e38d TH |
817 | struct class_dev_iter iter; |
818 | struct device *dev; | |
819 | ||
820 | class_dev_iter_init(&iter, &block_class, NULL, &disk_type); | |
821 | while ((dev = class_dev_iter_next(&iter))) { | |
822 | struct gendisk *disk = dev_to_disk(dev); | |
e71bf0d0 | 823 | struct disk_part_iter piter; |
ad1eaa53 | 824 | struct block_device *part; |
1f014290 TH |
825 | char name_buf[BDEVNAME_SIZE]; |
826 | char devt_buf[BDEVT_SIZE]; | |
def4e38d TH |
827 | |
828 | /* | |
829 | * Don't show empty devices or things that have been | |
25985edc | 830 | * suppressed |
def4e38d TH |
831 | */ |
832 | if (get_capacity(disk) == 0 || | |
833 | (disk->flags & GENHD_FL_SUPPRESS_PARTITION_INFO)) | |
834 | continue; | |
835 | ||
836 | /* | |
837 | * Note, unlike /proc/partitions, I am showing the | |
838 | * numbers in hex - the same format as the root= | |
839 | * option takes. | |
840 | */ | |
074a7aca TH |
841 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); |
842 | while ((part = disk_part_iter_next(&piter))) { | |
ad1eaa53 | 843 | bool is_part0 = part == disk->part0; |
def4e38d | 844 | |
b5af921e | 845 | printk("%s%s %10llu %s %s", is_part0 ? "" : " ", |
ad1eaa53 CH |
846 | bdevt_str(part->bd_dev, devt_buf), |
847 | bdev_nr_sectors(part) >> 1, | |
848 | disk_name(disk, part->bd_partno, name_buf), | |
849 | part->bd_meta_info ? | |
850 | part->bd_meta_info->uuid : ""); | |
074a7aca | 851 | if (is_part0) { |
52c44d93 | 852 | if (dev->parent && dev->parent->driver) |
074a7aca | 853 | printk(" driver: %s\n", |
52c44d93 | 854 | dev->parent->driver->name); |
074a7aca TH |
855 | else |
856 | printk(" (driver?)\n"); | |
857 | } else | |
858 | printk("\n"); | |
859 | } | |
e71bf0d0 | 860 | disk_part_iter_exit(&piter); |
def4e38d TH |
861 | } |
862 | class_dev_iter_exit(&iter); | |
dd2a345f DG |
863 | } |
864 | ||
1da177e4 LT |
865 | #ifdef CONFIG_PROC_FS |
866 | /* iterator */ | |
def4e38d | 867 | static void *disk_seqf_start(struct seq_file *seqf, loff_t *pos) |
68c4d4a7 | 868 | { |
def4e38d TH |
869 | loff_t skip = *pos; |
870 | struct class_dev_iter *iter; | |
871 | struct device *dev; | |
68c4d4a7 | 872 | |
aeb3d3a8 | 873 | iter = kmalloc(sizeof(*iter), GFP_KERNEL); |
def4e38d TH |
874 | if (!iter) |
875 | return ERR_PTR(-ENOMEM); | |
876 | ||
877 | seqf->private = iter; | |
878 | class_dev_iter_init(iter, &block_class, NULL, &disk_type); | |
879 | do { | |
880 | dev = class_dev_iter_next(iter); | |
881 | if (!dev) | |
882 | return NULL; | |
883 | } while (skip--); | |
884 | ||
885 | return dev_to_disk(dev); | |
68c4d4a7 GKH |
886 | } |
887 | ||
def4e38d | 888 | static void *disk_seqf_next(struct seq_file *seqf, void *v, loff_t *pos) |
1da177e4 | 889 | { |
edfaa7c3 | 890 | struct device *dev; |
1da177e4 | 891 | |
def4e38d TH |
892 | (*pos)++; |
893 | dev = class_dev_iter_next(seqf->private); | |
2ac3cee5 | 894 | if (dev) |
68c4d4a7 | 895 | return dev_to_disk(dev); |
2ac3cee5 | 896 | |
1da177e4 LT |
897 | return NULL; |
898 | } | |
899 | ||
def4e38d | 900 | static void disk_seqf_stop(struct seq_file *seqf, void *v) |
27f30251 | 901 | { |
def4e38d | 902 | struct class_dev_iter *iter = seqf->private; |
27f30251 | 903 | |
def4e38d TH |
904 | /* stop is called even after start failed :-( */ |
905 | if (iter) { | |
906 | class_dev_iter_exit(iter); | |
907 | kfree(iter); | |
77da1605 | 908 | seqf->private = NULL; |
5c0ef6d0 | 909 | } |
1da177e4 LT |
910 | } |
911 | ||
def4e38d | 912 | static void *show_partition_start(struct seq_file *seqf, loff_t *pos) |
1da177e4 | 913 | { |
06768067 | 914 | void *p; |
def4e38d TH |
915 | |
916 | p = disk_seqf_start(seqf, pos); | |
b9f985b6 | 917 | if (!IS_ERR_OR_NULL(p) && !*pos) |
def4e38d TH |
918 | seq_puts(seqf, "major minor #blocks name\n\n"); |
919 | return p; | |
1da177e4 LT |
920 | } |
921 | ||
cf771cb5 | 922 | static int show_partition(struct seq_file *seqf, void *v) |
1da177e4 LT |
923 | { |
924 | struct gendisk *sgp = v; | |
e71bf0d0 | 925 | struct disk_part_iter piter; |
ad1eaa53 | 926 | struct block_device *part; |
1da177e4 LT |
927 | char buf[BDEVNAME_SIZE]; |
928 | ||
1da177e4 | 929 | /* Don't show non-partitionable removeable devices or empty devices */ |
d27769ec | 930 | if (!get_capacity(sgp) || (!disk_max_parts(sgp) && |
f331c029 | 931 | (sgp->flags & GENHD_FL_REMOVABLE))) |
1da177e4 LT |
932 | return 0; |
933 | if (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO) | |
934 | return 0; | |
935 | ||
936 | /* show the full disk and all non-0 size partitions of it */ | |
074a7aca | 937 | disk_part_iter_init(&piter, sgp, DISK_PITER_INCL_PART0); |
e71bf0d0 | 938 | while ((part = disk_part_iter_next(&piter))) |
1f014290 | 939 | seq_printf(seqf, "%4d %7d %10llu %s\n", |
ad1eaa53 CH |
940 | MAJOR(part->bd_dev), MINOR(part->bd_dev), |
941 | bdev_nr_sectors(part) >> 1, | |
942 | disk_name(sgp, part->bd_partno, buf)); | |
e71bf0d0 | 943 | disk_part_iter_exit(&piter); |
1da177e4 LT |
944 | |
945 | return 0; | |
946 | } | |
947 | ||
f500975a | 948 | static const struct seq_operations partitions_op = { |
def4e38d TH |
949 | .start = show_partition_start, |
950 | .next = disk_seqf_next, | |
951 | .stop = disk_seqf_stop, | |
edfaa7c3 | 952 | .show = show_partition |
1da177e4 LT |
953 | }; |
954 | #endif | |
955 | ||
1da177e4 LT |
956 | static int __init genhd_device_init(void) |
957 | { | |
e105b8bf DW |
958 | int error; |
959 | ||
960 | block_class.dev_kobj = sysfs_dev_block_kobj; | |
961 | error = class_register(&block_class); | |
ee27a558 RM |
962 | if (unlikely(error)) |
963 | return error; | |
1da177e4 | 964 | blk_dev_init(); |
edfaa7c3 | 965 | |
561ec68e ZY |
966 | register_blkdev(BLOCK_EXT_MAJOR, "blkext"); |
967 | ||
edfaa7c3 | 968 | /* create top-level block dir */ |
e52eec13 AK |
969 | if (!sysfs_deprecated) |
970 | block_depr = kobject_create_and_add("block", NULL); | |
830d3cfb | 971 | return 0; |
1da177e4 LT |
972 | } |
973 | ||
974 | subsys_initcall(genhd_device_init); | |
975 | ||
edfaa7c3 KS |
976 | static ssize_t disk_range_show(struct device *dev, |
977 | struct device_attribute *attr, char *buf) | |
1da177e4 | 978 | { |
edfaa7c3 | 979 | struct gendisk *disk = dev_to_disk(dev); |
1da177e4 | 980 | |
edfaa7c3 | 981 | return sprintf(buf, "%d\n", disk->minors); |
1da177e4 LT |
982 | } |
983 | ||
1f014290 TH |
984 | static ssize_t disk_ext_range_show(struct device *dev, |
985 | struct device_attribute *attr, char *buf) | |
986 | { | |
987 | struct gendisk *disk = dev_to_disk(dev); | |
988 | ||
b5d0b9df | 989 | return sprintf(buf, "%d\n", disk_max_parts(disk)); |
1f014290 TH |
990 | } |
991 | ||
edfaa7c3 KS |
992 | static ssize_t disk_removable_show(struct device *dev, |
993 | struct device_attribute *attr, char *buf) | |
a7fd6706 | 994 | { |
edfaa7c3 | 995 | struct gendisk *disk = dev_to_disk(dev); |
a7fd6706 | 996 | |
edfaa7c3 KS |
997 | return sprintf(buf, "%d\n", |
998 | (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0)); | |
a7fd6706 KS |
999 | } |
1000 | ||
8ddcd653 CH |
1001 | static ssize_t disk_hidden_show(struct device *dev, |
1002 | struct device_attribute *attr, char *buf) | |
1003 | { | |
1004 | struct gendisk *disk = dev_to_disk(dev); | |
1005 | ||
1006 | return sprintf(buf, "%d\n", | |
1007 | (disk->flags & GENHD_FL_HIDDEN ? 1 : 0)); | |
1008 | } | |
1009 | ||
1c9ce527 KS |
1010 | static ssize_t disk_ro_show(struct device *dev, |
1011 | struct device_attribute *attr, char *buf) | |
1012 | { | |
1013 | struct gendisk *disk = dev_to_disk(dev); | |
1014 | ||
b7db9956 | 1015 | return sprintf(buf, "%d\n", get_disk_ro(disk) ? 1 : 0); |
1c9ce527 KS |
1016 | } |
1017 | ||
3ad5cee5 CH |
1018 | ssize_t part_size_show(struct device *dev, |
1019 | struct device_attribute *attr, char *buf) | |
1020 | { | |
0d02129e | 1021 | return sprintf(buf, "%llu\n", bdev_nr_sectors(dev_to_bdev(dev))); |
3ad5cee5 CH |
1022 | } |
1023 | ||
1024 | ssize_t part_stat_show(struct device *dev, | |
1025 | struct device_attribute *attr, char *buf) | |
1026 | { | |
0d02129e CH |
1027 | struct block_device *bdev = dev_to_bdev(dev); |
1028 | struct request_queue *q = bdev->bd_disk->queue; | |
ea18e0f0 | 1029 | struct disk_stats stat; |
3ad5cee5 CH |
1030 | unsigned int inflight; |
1031 | ||
0d02129e | 1032 | part_stat_read_all(bdev, &stat); |
b2f609e1 | 1033 | if (queue_is_mq(q)) |
0d02129e | 1034 | inflight = blk_mq_in_flight(q, bdev); |
b2f609e1 | 1035 | else |
0d02129e | 1036 | inflight = part_in_flight(bdev); |
ea18e0f0 | 1037 | |
3ad5cee5 CH |
1038 | return sprintf(buf, |
1039 | "%8lu %8lu %8llu %8u " | |
1040 | "%8lu %8lu %8llu %8u " | |
1041 | "%8u %8u %8u " | |
1042 | "%8lu %8lu %8llu %8u " | |
1043 | "%8lu %8u" | |
1044 | "\n", | |
ea18e0f0 KK |
1045 | stat.ios[STAT_READ], |
1046 | stat.merges[STAT_READ], | |
1047 | (unsigned long long)stat.sectors[STAT_READ], | |
1048 | (unsigned int)div_u64(stat.nsecs[STAT_READ], NSEC_PER_MSEC), | |
1049 | stat.ios[STAT_WRITE], | |
1050 | stat.merges[STAT_WRITE], | |
1051 | (unsigned long long)stat.sectors[STAT_WRITE], | |
1052 | (unsigned int)div_u64(stat.nsecs[STAT_WRITE], NSEC_PER_MSEC), | |
3ad5cee5 | 1053 | inflight, |
ea18e0f0 | 1054 | jiffies_to_msecs(stat.io_ticks), |
8cd5b8fc KK |
1055 | (unsigned int)div_u64(stat.nsecs[STAT_READ] + |
1056 | stat.nsecs[STAT_WRITE] + | |
1057 | stat.nsecs[STAT_DISCARD] + | |
1058 | stat.nsecs[STAT_FLUSH], | |
1059 | NSEC_PER_MSEC), | |
ea18e0f0 KK |
1060 | stat.ios[STAT_DISCARD], |
1061 | stat.merges[STAT_DISCARD], | |
1062 | (unsigned long long)stat.sectors[STAT_DISCARD], | |
1063 | (unsigned int)div_u64(stat.nsecs[STAT_DISCARD], NSEC_PER_MSEC), | |
1064 | stat.ios[STAT_FLUSH], | |
1065 | (unsigned int)div_u64(stat.nsecs[STAT_FLUSH], NSEC_PER_MSEC)); | |
3ad5cee5 CH |
1066 | } |
1067 | ||
1068 | ssize_t part_inflight_show(struct device *dev, struct device_attribute *attr, | |
1069 | char *buf) | |
1070 | { | |
0d02129e CH |
1071 | struct block_device *bdev = dev_to_bdev(dev); |
1072 | struct request_queue *q = bdev->bd_disk->queue; | |
3ad5cee5 CH |
1073 | unsigned int inflight[2]; |
1074 | ||
b2f609e1 | 1075 | if (queue_is_mq(q)) |
0d02129e | 1076 | blk_mq_in_flight_rw(q, bdev, inflight); |
b2f609e1 | 1077 | else |
0d02129e | 1078 | part_in_flight_rw(bdev, inflight); |
b2f609e1 | 1079 | |
3ad5cee5 CH |
1080 | return sprintf(buf, "%8u %8u\n", inflight[0], inflight[1]); |
1081 | } | |
1082 | ||
edfaa7c3 KS |
1083 | static ssize_t disk_capability_show(struct device *dev, |
1084 | struct device_attribute *attr, char *buf) | |
86ce18d7 | 1085 | { |
edfaa7c3 KS |
1086 | struct gendisk *disk = dev_to_disk(dev); |
1087 | ||
1088 | return sprintf(buf, "%x\n", disk->flags); | |
86ce18d7 | 1089 | } |
edfaa7c3 | 1090 | |
c72758f3 MP |
1091 | static ssize_t disk_alignment_offset_show(struct device *dev, |
1092 | struct device_attribute *attr, | |
1093 | char *buf) | |
1094 | { | |
1095 | struct gendisk *disk = dev_to_disk(dev); | |
1096 | ||
1097 | return sprintf(buf, "%d\n", queue_alignment_offset(disk->queue)); | |
1098 | } | |
1099 | ||
86b37281 MP |
1100 | static ssize_t disk_discard_alignment_show(struct device *dev, |
1101 | struct device_attribute *attr, | |
1102 | char *buf) | |
1103 | { | |
1104 | struct gendisk *disk = dev_to_disk(dev); | |
1105 | ||
dd3d145d | 1106 | return sprintf(buf, "%d\n", queue_discard_alignment(disk->queue)); |
86b37281 MP |
1107 | } |
1108 | ||
5657a819 JP |
1109 | static DEVICE_ATTR(range, 0444, disk_range_show, NULL); |
1110 | static DEVICE_ATTR(ext_range, 0444, disk_ext_range_show, NULL); | |
1111 | static DEVICE_ATTR(removable, 0444, disk_removable_show, NULL); | |
1112 | static DEVICE_ATTR(hidden, 0444, disk_hidden_show, NULL); | |
1113 | static DEVICE_ATTR(ro, 0444, disk_ro_show, NULL); | |
1114 | static DEVICE_ATTR(size, 0444, part_size_show, NULL); | |
1115 | static DEVICE_ATTR(alignment_offset, 0444, disk_alignment_offset_show, NULL); | |
1116 | static DEVICE_ATTR(discard_alignment, 0444, disk_discard_alignment_show, NULL); | |
1117 | static DEVICE_ATTR(capability, 0444, disk_capability_show, NULL); | |
1118 | static DEVICE_ATTR(stat, 0444, part_stat_show, NULL); | |
1119 | static DEVICE_ATTR(inflight, 0444, part_inflight_show, NULL); | |
1120 | static DEVICE_ATTR(badblocks, 0644, disk_badblocks_show, disk_badblocks_store); | |
3ad5cee5 | 1121 | |
c17bb495 | 1122 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
3ad5cee5 CH |
1123 | ssize_t part_fail_show(struct device *dev, |
1124 | struct device_attribute *attr, char *buf) | |
1125 | { | |
0d02129e | 1126 | return sprintf(buf, "%d\n", dev_to_bdev(dev)->bd_make_it_fail); |
3ad5cee5 CH |
1127 | } |
1128 | ||
1129 | ssize_t part_fail_store(struct device *dev, | |
1130 | struct device_attribute *attr, | |
1131 | const char *buf, size_t count) | |
1132 | { | |
3ad5cee5 CH |
1133 | int i; |
1134 | ||
1135 | if (count > 0 && sscanf(buf, "%d", &i) > 0) | |
0d02129e | 1136 | dev_to_bdev(dev)->bd_make_it_fail = i; |
3ad5cee5 CH |
1137 | |
1138 | return count; | |
1139 | } | |
1140 | ||
edfaa7c3 | 1141 | static struct device_attribute dev_attr_fail = |
5657a819 | 1142 | __ATTR(make-it-fail, 0644, part_fail_show, part_fail_store); |
3ad5cee5 CH |
1143 | #endif /* CONFIG_FAIL_MAKE_REQUEST */ |
1144 | ||
581d4e28 JA |
1145 | #ifdef CONFIG_FAIL_IO_TIMEOUT |
1146 | static struct device_attribute dev_attr_fail_timeout = | |
5657a819 | 1147 | __ATTR(io-timeout-fail, 0644, part_timeout_show, part_timeout_store); |
581d4e28 | 1148 | #endif |
edfaa7c3 KS |
1149 | |
1150 | static struct attribute *disk_attrs[] = { | |
1151 | &dev_attr_range.attr, | |
1f014290 | 1152 | &dev_attr_ext_range.attr, |
edfaa7c3 | 1153 | &dev_attr_removable.attr, |
8ddcd653 | 1154 | &dev_attr_hidden.attr, |
1c9ce527 | 1155 | &dev_attr_ro.attr, |
edfaa7c3 | 1156 | &dev_attr_size.attr, |
c72758f3 | 1157 | &dev_attr_alignment_offset.attr, |
86b37281 | 1158 | &dev_attr_discard_alignment.attr, |
edfaa7c3 KS |
1159 | &dev_attr_capability.attr, |
1160 | &dev_attr_stat.attr, | |
316d315b | 1161 | &dev_attr_inflight.attr, |
99e6608c | 1162 | &dev_attr_badblocks.attr, |
edfaa7c3 KS |
1163 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
1164 | &dev_attr_fail.attr, | |
581d4e28 JA |
1165 | #endif |
1166 | #ifdef CONFIG_FAIL_IO_TIMEOUT | |
1167 | &dev_attr_fail_timeout.attr, | |
edfaa7c3 KS |
1168 | #endif |
1169 | NULL | |
1170 | }; | |
1171 | ||
9438b3e0 DW |
1172 | static umode_t disk_visible(struct kobject *kobj, struct attribute *a, int n) |
1173 | { | |
1174 | struct device *dev = container_of(kobj, typeof(*dev), kobj); | |
1175 | struct gendisk *disk = dev_to_disk(dev); | |
1176 | ||
1177 | if (a == &dev_attr_badblocks.attr && !disk->bb) | |
1178 | return 0; | |
1179 | return a->mode; | |
1180 | } | |
1181 | ||
edfaa7c3 KS |
1182 | static struct attribute_group disk_attr_group = { |
1183 | .attrs = disk_attrs, | |
9438b3e0 | 1184 | .is_visible = disk_visible, |
edfaa7c3 KS |
1185 | }; |
1186 | ||
a4dbd674 | 1187 | static const struct attribute_group *disk_attr_groups[] = { |
edfaa7c3 KS |
1188 | &disk_attr_group, |
1189 | NULL | |
1da177e4 LT |
1190 | }; |
1191 | ||
b5bd357c LC |
1192 | /** |
1193 | * disk_release - releases all allocated resources of the gendisk | |
1194 | * @dev: the device representing this disk | |
1195 | * | |
1196 | * This function releases all allocated resources of the gendisk. | |
1197 | * | |
b5bd357c LC |
1198 | * Drivers which used __device_add_disk() have a gendisk with a request_queue |
1199 | * assigned. Since the request_queue sits on top of the gendisk for these | |
1200 | * drivers we also call blk_put_queue() for them, and we expect the | |
1201 | * request_queue refcount to reach 0 at this point, and so the request_queue | |
1202 | * will also be freed prior to the disk. | |
e8c7d14a LC |
1203 | * |
1204 | * Context: can sleep | |
b5bd357c | 1205 | */ |
edfaa7c3 | 1206 | static void disk_release(struct device *dev) |
1da177e4 | 1207 | { |
edfaa7c3 KS |
1208 | struct gendisk *disk = dev_to_disk(dev); |
1209 | ||
e8c7d14a LC |
1210 | might_sleep(); |
1211 | ||
2da78092 | 1212 | blk_free_devt(dev->devt); |
77ea887e | 1213 | disk_release_events(disk); |
1da177e4 | 1214 | kfree(disk->random); |
a33df75c | 1215 | xa_destroy(&disk->part_tbl); |
cb8432d6 | 1216 | bdput(disk->part0); |
523e1d39 TH |
1217 | if (disk->queue) |
1218 | blk_put_queue(disk->queue); | |
1da177e4 LT |
1219 | kfree(disk); |
1220 | } | |
edfaa7c3 KS |
1221 | struct class block_class = { |
1222 | .name = "block", | |
1da177e4 LT |
1223 | }; |
1224 | ||
3c2670e6 | 1225 | static char *block_devnode(struct device *dev, umode_t *mode, |
4e4098a3 | 1226 | kuid_t *uid, kgid_t *gid) |
b03f38b6 KS |
1227 | { |
1228 | struct gendisk *disk = dev_to_disk(dev); | |
1229 | ||
348e114b CH |
1230 | if (disk->fops->devnode) |
1231 | return disk->fops->devnode(disk, mode); | |
b03f38b6 KS |
1232 | return NULL; |
1233 | } | |
1234 | ||
ef45fe47 | 1235 | const struct device_type disk_type = { |
edfaa7c3 KS |
1236 | .name = "disk", |
1237 | .groups = disk_attr_groups, | |
1238 | .release = disk_release, | |
e454cea2 | 1239 | .devnode = block_devnode, |
1da177e4 LT |
1240 | }; |
1241 | ||
a6e2ba88 | 1242 | #ifdef CONFIG_PROC_FS |
cf771cb5 TH |
1243 | /* |
1244 | * aggregate disk stat collector. Uses the same stats that the sysfs | |
1245 | * entries do, above, but makes them available through one seq_file. | |
1246 | * | |
1247 | * The output looks suspiciously like /proc/partitions with a bunch of | |
1248 | * extra fields. | |
1249 | */ | |
1250 | static int diskstats_show(struct seq_file *seqf, void *v) | |
1da177e4 LT |
1251 | { |
1252 | struct gendisk *gp = v; | |
e71bf0d0 | 1253 | struct disk_part_iter piter; |
ad1eaa53 | 1254 | struct block_device *hd; |
1da177e4 | 1255 | char buf[BDEVNAME_SIZE]; |
e016b782 | 1256 | unsigned int inflight; |
ea18e0f0 | 1257 | struct disk_stats stat; |
1da177e4 LT |
1258 | |
1259 | /* | |
ed9e1982 | 1260 | if (&disk_to_dev(gp)->kobj.entry == block_class.devices.next) |
cf771cb5 | 1261 | seq_puts(seqf, "major minor name" |
1da177e4 LT |
1262 | " rio rmerge rsect ruse wio wmerge " |
1263 | "wsect wuse running use aveq" | |
1264 | "\n\n"); | |
1265 | */ | |
9f5e4865 | 1266 | |
71982a40 | 1267 | disk_part_iter_init(&piter, gp, DISK_PITER_INCL_EMPTY_PART0); |
e71bf0d0 | 1268 | while ((hd = disk_part_iter_next(&piter))) { |
0d02129e | 1269 | part_stat_read_all(hd, &stat); |
b2f609e1 | 1270 | if (queue_is_mq(gp->queue)) |
ad1eaa53 | 1271 | inflight = blk_mq_in_flight(gp->queue, hd); |
b2f609e1 | 1272 | else |
ad1eaa53 | 1273 | inflight = part_in_flight(hd); |
ea18e0f0 | 1274 | |
bdca3c87 MC |
1275 | seq_printf(seqf, "%4d %7d %s " |
1276 | "%lu %lu %lu %u " | |
1277 | "%lu %lu %lu %u " | |
1278 | "%u %u %u " | |
b6866318 KK |
1279 | "%lu %lu %lu %u " |
1280 | "%lu %u" | |
1281 | "\n", | |
ad1eaa53 CH |
1282 | MAJOR(hd->bd_dev), MINOR(hd->bd_dev), |
1283 | disk_name(gp, hd->bd_partno, buf), | |
ea18e0f0 KK |
1284 | stat.ios[STAT_READ], |
1285 | stat.merges[STAT_READ], | |
1286 | stat.sectors[STAT_READ], | |
1287 | (unsigned int)div_u64(stat.nsecs[STAT_READ], | |
1288 | NSEC_PER_MSEC), | |
1289 | stat.ios[STAT_WRITE], | |
1290 | stat.merges[STAT_WRITE], | |
1291 | stat.sectors[STAT_WRITE], | |
1292 | (unsigned int)div_u64(stat.nsecs[STAT_WRITE], | |
1293 | NSEC_PER_MSEC), | |
e016b782 | 1294 | inflight, |
ea18e0f0 | 1295 | jiffies_to_msecs(stat.io_ticks), |
8cd5b8fc KK |
1296 | (unsigned int)div_u64(stat.nsecs[STAT_READ] + |
1297 | stat.nsecs[STAT_WRITE] + | |
1298 | stat.nsecs[STAT_DISCARD] + | |
1299 | stat.nsecs[STAT_FLUSH], | |
1300 | NSEC_PER_MSEC), | |
ea18e0f0 KK |
1301 | stat.ios[STAT_DISCARD], |
1302 | stat.merges[STAT_DISCARD], | |
1303 | stat.sectors[STAT_DISCARD], | |
1304 | (unsigned int)div_u64(stat.nsecs[STAT_DISCARD], | |
1305 | NSEC_PER_MSEC), | |
1306 | stat.ios[STAT_FLUSH], | |
1307 | (unsigned int)div_u64(stat.nsecs[STAT_FLUSH], | |
1308 | NSEC_PER_MSEC) | |
28f39d55 | 1309 | ); |
1da177e4 | 1310 | } |
e71bf0d0 | 1311 | disk_part_iter_exit(&piter); |
9f5e4865 | 1312 | |
1da177e4 LT |
1313 | return 0; |
1314 | } | |
1315 | ||
31d85ab2 | 1316 | static const struct seq_operations diskstats_op = { |
def4e38d TH |
1317 | .start = disk_seqf_start, |
1318 | .next = disk_seqf_next, | |
1319 | .stop = disk_seqf_stop, | |
1da177e4 LT |
1320 | .show = diskstats_show |
1321 | }; | |
f500975a AD |
1322 | |
1323 | static int __init proc_genhd_init(void) | |
1324 | { | |
fddda2b7 CH |
1325 | proc_create_seq("diskstats", 0, NULL, &diskstats_op); |
1326 | proc_create_seq("partitions", 0, NULL, &partitions_op); | |
f500975a AD |
1327 | return 0; |
1328 | } | |
1329 | module_init(proc_genhd_init); | |
a6e2ba88 | 1330 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 1331 | |
cf771cb5 | 1332 | dev_t blk_lookup_devt(const char *name, int partno) |
a142be85 | 1333 | { |
def4e38d TH |
1334 | dev_t devt = MKDEV(0, 0); |
1335 | struct class_dev_iter iter; | |
1336 | struct device *dev; | |
a142be85 | 1337 | |
def4e38d TH |
1338 | class_dev_iter_init(&iter, &block_class, NULL, &disk_type); |
1339 | while ((dev = class_dev_iter_next(&iter))) { | |
a142be85 | 1340 | struct gendisk *disk = dev_to_disk(dev); |
0d02129e | 1341 | struct block_device *part; |
a142be85 | 1342 | |
3ada8b7e | 1343 | if (strcmp(dev_name(dev), name)) |
f331c029 | 1344 | continue; |
f331c029 | 1345 | |
41b8c853 NB |
1346 | if (partno < disk->minors) { |
1347 | /* We need to return the right devno, even | |
1348 | * if the partition doesn't exist yet. | |
1349 | */ | |
1350 | devt = MKDEV(MAJOR(dev->devt), | |
1351 | MINOR(dev->devt) + partno); | |
1352 | break; | |
1353 | } | |
0d02129e | 1354 | part = bdget_disk(disk, partno); |
2bbedcb4 | 1355 | if (part) { |
0d02129e CH |
1356 | devt = part->bd_dev; |
1357 | bdput(part); | |
548b10eb | 1358 | break; |
def4e38d | 1359 | } |
5c0ef6d0 | 1360 | } |
def4e38d | 1361 | class_dev_iter_exit(&iter); |
edfaa7c3 KS |
1362 | return devt; |
1363 | } | |
edfaa7c3 | 1364 | |
e319e1fb | 1365 | struct gendisk *__alloc_disk_node(int minors, int node_id) |
1946089a CL |
1366 | { |
1367 | struct gendisk *disk; | |
1368 | ||
de65b012 CH |
1369 | if (minors > DISK_MAX_PARTS) { |
1370 | printk(KERN_ERR | |
7fb52621 | 1371 | "block: can't allocate more than %d partitions\n", |
de65b012 CH |
1372 | DISK_MAX_PARTS); |
1373 | minors = DISK_MAX_PARTS; | |
1374 | } | |
1946089a | 1375 | |
c1b511eb | 1376 | disk = kzalloc_node(sizeof(struct gendisk), GFP_KERNEL, node_id); |
f93af2a4 CH |
1377 | if (!disk) |
1378 | return NULL; | |
6c23a968 | 1379 | |
cb8432d6 CH |
1380 | disk->part0 = bdev_alloc(disk, 0); |
1381 | if (!disk->part0) | |
22ae8ce8 CH |
1382 | goto out_free_disk; |
1383 | ||
f93af2a4 | 1384 | disk->node_id = node_id; |
a33df75c CH |
1385 | xa_init(&disk->part_tbl); |
1386 | if (xa_insert(&disk->part_tbl, 0, disk->part0, GFP_KERNEL)) | |
1387 | goto out_destroy_part_tbl; | |
f93af2a4 CH |
1388 | |
1389 | disk->minors = minors; | |
1390 | rand_initialize_disk(disk); | |
1391 | disk_to_dev(disk)->class = &block_class; | |
1392 | disk_to_dev(disk)->type = &disk_type; | |
1393 | device_initialize(disk_to_dev(disk)); | |
1da177e4 | 1394 | return disk; |
f93af2a4 | 1395 | |
a33df75c CH |
1396 | out_destroy_part_tbl: |
1397 | xa_destroy(&disk->part_tbl); | |
cb8432d6 | 1398 | bdput(disk->part0); |
f93af2a4 CH |
1399 | out_free_disk: |
1400 | kfree(disk); | |
1401 | return NULL; | |
1da177e4 | 1402 | } |
e319e1fb | 1403 | EXPORT_SYMBOL(__alloc_disk_node); |
1da177e4 | 1404 | |
b5bd357c LC |
1405 | /** |
1406 | * put_disk - decrements the gendisk refcount | |
0d20dcc2 | 1407 | * @disk: the struct gendisk to decrement the refcount for |
b5bd357c LC |
1408 | * |
1409 | * This decrements the refcount for the struct gendisk. When this reaches 0 | |
1410 | * we'll have disk_release() called. | |
e8c7d14a LC |
1411 | * |
1412 | * Context: Any context, but the last reference must not be dropped from | |
1413 | * atomic context. | |
b5bd357c | 1414 | */ |
1da177e4 LT |
1415 | void put_disk(struct gendisk *disk) |
1416 | { | |
1417 | if (disk) | |
efdc41c8 | 1418 | put_device(disk_to_dev(disk)); |
1da177e4 | 1419 | } |
1da177e4 LT |
1420 | EXPORT_SYMBOL(put_disk); |
1421 | ||
e3264a4d HR |
1422 | static void set_disk_ro_uevent(struct gendisk *gd, int ro) |
1423 | { | |
1424 | char event[] = "DISK_RO=1"; | |
1425 | char *envp[] = { event, NULL }; | |
1426 | ||
1427 | if (!ro) | |
1428 | event[8] = '0'; | |
1429 | kobject_uevent_env(&disk_to_dev(gd)->kobj, KOBJ_CHANGE, envp); | |
1430 | } | |
1431 | ||
52f019d4 CH |
1432 | /** |
1433 | * set_disk_ro - set a gendisk read-only | |
1434 | * @disk: gendisk to operate on | |
7f31bee3 | 1435 | * @read_only: %true to set the disk read-only, %false set the disk read/write |
52f019d4 CH |
1436 | * |
1437 | * This function is used to indicate whether a given disk device should have its | |
1438 | * read-only flag set. set_disk_ro() is typically used by device drivers to | |
1439 | * indicate whether the underlying physical device is write-protected. | |
1440 | */ | |
1441 | void set_disk_ro(struct gendisk *disk, bool read_only) | |
1da177e4 | 1442 | { |
52f019d4 CH |
1443 | if (read_only) { |
1444 | if (test_and_set_bit(GD_READ_ONLY, &disk->state)) | |
1445 | return; | |
1446 | } else { | |
1447 | if (!test_and_clear_bit(GD_READ_ONLY, &disk->state)) | |
1448 | return; | |
e3264a4d | 1449 | } |
52f019d4 | 1450 | set_disk_ro_uevent(disk, read_only); |
1da177e4 | 1451 | } |
1da177e4 LT |
1452 | EXPORT_SYMBOL(set_disk_ro); |
1453 | ||
1454 | int bdev_read_only(struct block_device *bdev) | |
1455 | { | |
947139bf | 1456 | return bdev->bd_read_only || get_disk_ro(bdev->bd_disk); |
1da177e4 | 1457 | } |
1da177e4 LT |
1458 | EXPORT_SYMBOL(bdev_read_only); |
1459 | ||
77ea887e TH |
1460 | /* |
1461 | * Disk events - monitor disk events like media change and eject request. | |
1462 | */ | |
1463 | struct disk_events { | |
1464 | struct list_head node; /* all disk_event's */ | |
1465 | struct gendisk *disk; /* the associated disk */ | |
1466 | spinlock_t lock; | |
1467 | ||
fdd514e1 | 1468 | struct mutex block_mutex; /* protects blocking */ |
77ea887e TH |
1469 | int block; /* event blocking depth */ |
1470 | unsigned int pending; /* events already sent out */ | |
1471 | unsigned int clearing; /* events being cleared */ | |
1472 | ||
1473 | long poll_msecs; /* interval, -1 for default */ | |
1474 | struct delayed_work dwork; | |
1475 | }; | |
1476 | ||
1477 | static const char *disk_events_strs[] = { | |
1478 | [ilog2(DISK_EVENT_MEDIA_CHANGE)] = "media_change", | |
1479 | [ilog2(DISK_EVENT_EJECT_REQUEST)] = "eject_request", | |
1480 | }; | |
1481 | ||
1482 | static char *disk_uevents[] = { | |
1483 | [ilog2(DISK_EVENT_MEDIA_CHANGE)] = "DISK_MEDIA_CHANGE=1", | |
1484 | [ilog2(DISK_EVENT_EJECT_REQUEST)] = "DISK_EJECT_REQUEST=1", | |
1485 | }; | |
1486 | ||
1487 | /* list of all disk_events */ | |
1488 | static DEFINE_MUTEX(disk_events_mutex); | |
1489 | static LIST_HEAD(disk_events); | |
1490 | ||
1491 | /* disable in-kernel polling by default */ | |
1fe8f348 | 1492 | static unsigned long disk_events_dfl_poll_msecs; |
77ea887e TH |
1493 | |
1494 | static unsigned long disk_events_poll_jiffies(struct gendisk *disk) | |
1495 | { | |
1496 | struct disk_events *ev = disk->ev; | |
1497 | long intv_msecs = 0; | |
1498 | ||
1499 | /* | |
1500 | * If device-specific poll interval is set, always use it. If | |
673387a9 | 1501 | * the default is being used, poll if the POLL flag is set. |
77ea887e TH |
1502 | */ |
1503 | if (ev->poll_msecs >= 0) | |
1504 | intv_msecs = ev->poll_msecs; | |
c92e2f04 | 1505 | else if (disk->event_flags & DISK_EVENT_FLAG_POLL) |
77ea887e TH |
1506 | intv_msecs = disk_events_dfl_poll_msecs; |
1507 | ||
1508 | return msecs_to_jiffies(intv_msecs); | |
1509 | } | |
1510 | ||
c3af54af TH |
1511 | /** |
1512 | * disk_block_events - block and flush disk event checking | |
1513 | * @disk: disk to block events for | |
1514 | * | |
1515 | * On return from this function, it is guaranteed that event checking | |
1516 | * isn't in progress and won't happen until unblocked by | |
1517 | * disk_unblock_events(). Events blocking is counted and the actual | |
1518 | * unblocking happens after the matching number of unblocks are done. | |
1519 | * | |
1520 | * Note that this intentionally does not block event checking from | |
1521 | * disk_clear_events(). | |
1522 | * | |
1523 | * CONTEXT: | |
1524 | * Might sleep. | |
1525 | */ | |
1526 | void disk_block_events(struct gendisk *disk) | |
77ea887e TH |
1527 | { |
1528 | struct disk_events *ev = disk->ev; | |
1529 | unsigned long flags; | |
1530 | bool cancel; | |
1531 | ||
c3af54af TH |
1532 | if (!ev) |
1533 | return; | |
1534 | ||
fdd514e1 TH |
1535 | /* |
1536 | * Outer mutex ensures that the first blocker completes canceling | |
1537 | * the event work before further blockers are allowed to finish. | |
1538 | */ | |
1539 | mutex_lock(&ev->block_mutex); | |
1540 | ||
77ea887e TH |
1541 | spin_lock_irqsave(&ev->lock, flags); |
1542 | cancel = !ev->block++; | |
1543 | spin_unlock_irqrestore(&ev->lock, flags); | |
1544 | ||
c3af54af TH |
1545 | if (cancel) |
1546 | cancel_delayed_work_sync(&disk->ev->dwork); | |
fdd514e1 TH |
1547 | |
1548 | mutex_unlock(&ev->block_mutex); | |
77ea887e TH |
1549 | } |
1550 | ||
1551 | static void __disk_unblock_events(struct gendisk *disk, bool check_now) | |
1552 | { | |
1553 | struct disk_events *ev = disk->ev; | |
1554 | unsigned long intv; | |
1555 | unsigned long flags; | |
1556 | ||
1557 | spin_lock_irqsave(&ev->lock, flags); | |
1558 | ||
1559 | if (WARN_ON_ONCE(ev->block <= 0)) | |
1560 | goto out_unlock; | |
1561 | ||
1562 | if (--ev->block) | |
1563 | goto out_unlock; | |
1564 | ||
77ea887e | 1565 | intv = disk_events_poll_jiffies(disk); |
77ea887e | 1566 | if (check_now) |
695588f9 VK |
1567 | queue_delayed_work(system_freezable_power_efficient_wq, |
1568 | &ev->dwork, 0); | |
77ea887e | 1569 | else if (intv) |
695588f9 VK |
1570 | queue_delayed_work(system_freezable_power_efficient_wq, |
1571 | &ev->dwork, intv); | |
77ea887e TH |
1572 | out_unlock: |
1573 | spin_unlock_irqrestore(&ev->lock, flags); | |
1574 | } | |
1575 | ||
77ea887e TH |
1576 | /** |
1577 | * disk_unblock_events - unblock disk event checking | |
1578 | * @disk: disk to unblock events for | |
1579 | * | |
1580 | * Undo disk_block_events(). When the block count reaches zero, it | |
1581 | * starts events polling if configured. | |
1582 | * | |
1583 | * CONTEXT: | |
1584 | * Don't care. Safe to call from irq context. | |
1585 | */ | |
1586 | void disk_unblock_events(struct gendisk *disk) | |
1587 | { | |
1588 | if (disk->ev) | |
facc31dd | 1589 | __disk_unblock_events(disk, false); |
77ea887e TH |
1590 | } |
1591 | ||
1592 | /** | |
85ef06d1 TH |
1593 | * disk_flush_events - schedule immediate event checking and flushing |
1594 | * @disk: disk to check and flush events for | |
1595 | * @mask: events to flush | |
77ea887e | 1596 | * |
85ef06d1 TH |
1597 | * Schedule immediate event checking on @disk if not blocked. Events in |
1598 | * @mask are scheduled to be cleared from the driver. Note that this | |
1599 | * doesn't clear the events from @disk->ev. | |
77ea887e TH |
1600 | * |
1601 | * CONTEXT: | |
85ef06d1 | 1602 | * If @mask is non-zero must be called with bdev->bd_mutex held. |
77ea887e | 1603 | */ |
85ef06d1 | 1604 | void disk_flush_events(struct gendisk *disk, unsigned int mask) |
77ea887e | 1605 | { |
a9dce2a3 | 1606 | struct disk_events *ev = disk->ev; |
a9dce2a3 TH |
1607 | |
1608 | if (!ev) | |
1609 | return; | |
1610 | ||
85ef06d1 TH |
1611 | spin_lock_irq(&ev->lock); |
1612 | ev->clearing |= mask; | |
41f63c53 | 1613 | if (!ev->block) |
695588f9 VK |
1614 | mod_delayed_work(system_freezable_power_efficient_wq, |
1615 | &ev->dwork, 0); | |
85ef06d1 | 1616 | spin_unlock_irq(&ev->lock); |
77ea887e | 1617 | } |
77ea887e TH |
1618 | |
1619 | /** | |
1620 | * disk_clear_events - synchronously check, clear and return pending events | |
1621 | * @disk: disk to fetch and clear events from | |
da3dae54 | 1622 | * @mask: mask of events to be fetched and cleared |
77ea887e TH |
1623 | * |
1624 | * Disk events are synchronously checked and pending events in @mask | |
1625 | * are cleared and returned. This ignores the block count. | |
1626 | * | |
1627 | * CONTEXT: | |
1628 | * Might sleep. | |
1629 | */ | |
95f6f3a4 | 1630 | static unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask) |
77ea887e | 1631 | { |
77ea887e TH |
1632 | struct disk_events *ev = disk->ev; |
1633 | unsigned int pending; | |
12c2bdb2 | 1634 | unsigned int clearing = mask; |
77ea887e | 1635 | |
a564e23f | 1636 | if (!ev) |
77ea887e | 1637 | return 0; |
77ea887e | 1638 | |
12c2bdb2 DB |
1639 | disk_block_events(disk); |
1640 | ||
1641 | /* | |
1642 | * store the union of mask and ev->clearing on the stack so that the | |
1643 | * race with disk_flush_events does not cause ambiguity (ev->clearing | |
1644 | * can still be modified even if events are blocked). | |
1645 | */ | |
77ea887e | 1646 | spin_lock_irq(&ev->lock); |
12c2bdb2 DB |
1647 | clearing |= ev->clearing; |
1648 | ev->clearing = 0; | |
77ea887e TH |
1649 | spin_unlock_irq(&ev->lock); |
1650 | ||
12c2bdb2 | 1651 | disk_check_events(ev, &clearing); |
aea24a8b | 1652 | /* |
12c2bdb2 DB |
1653 | * if ev->clearing is not 0, the disk_flush_events got called in the |
1654 | * middle of this function, so we want to run the workfn without delay. | |
aea24a8b | 1655 | */ |
12c2bdb2 | 1656 | __disk_unblock_events(disk, ev->clearing ? true : false); |
77ea887e TH |
1657 | |
1658 | /* then, fetch and clear pending events */ | |
1659 | spin_lock_irq(&ev->lock); | |
77ea887e TH |
1660 | pending = ev->pending & mask; |
1661 | ev->pending &= ~mask; | |
1662 | spin_unlock_irq(&ev->lock); | |
12c2bdb2 | 1663 | WARN_ON_ONCE(clearing & mask); |
77ea887e TH |
1664 | |
1665 | return pending; | |
1666 | } | |
1667 | ||
95f6f3a4 CH |
1668 | /** |
1669 | * bdev_check_media_change - check if a removable media has been changed | |
1670 | * @bdev: block device to check | |
1671 | * | |
1672 | * Check whether a removable media has been changed, and attempt to free all | |
1673 | * dentries and inodes and invalidates all block device page cache entries in | |
1674 | * that case. | |
1675 | * | |
1676 | * Returns %true if the block device changed, or %false if not. | |
1677 | */ | |
1678 | bool bdev_check_media_change(struct block_device *bdev) | |
1679 | { | |
1680 | unsigned int events; | |
1681 | ||
1682 | events = disk_clear_events(bdev->bd_disk, DISK_EVENT_MEDIA_CHANGE | | |
1683 | DISK_EVENT_EJECT_REQUEST); | |
1684 | if (!(events & DISK_EVENT_MEDIA_CHANGE)) | |
1685 | return false; | |
1686 | ||
1687 | if (__invalidate_device(bdev, true)) | |
1688 | pr_warn("VFS: busy inodes on changed media %s\n", | |
1689 | bdev->bd_disk->disk_name); | |
38430f08 | 1690 | set_bit(GD_NEED_PART_SCAN, &bdev->bd_disk->state); |
95f6f3a4 CH |
1691 | return true; |
1692 | } | |
1693 | EXPORT_SYMBOL(bdev_check_media_change); | |
1694 | ||
12c2bdb2 DB |
1695 | /* |
1696 | * Separate this part out so that a different pointer for clearing_ptr can be | |
1697 | * passed in for disk_clear_events. | |
1698 | */ | |
77ea887e TH |
1699 | static void disk_events_workfn(struct work_struct *work) |
1700 | { | |
1701 | struct delayed_work *dwork = to_delayed_work(work); | |
1702 | struct disk_events *ev = container_of(dwork, struct disk_events, dwork); | |
12c2bdb2 DB |
1703 | |
1704 | disk_check_events(ev, &ev->clearing); | |
1705 | } | |
1706 | ||
1707 | static void disk_check_events(struct disk_events *ev, | |
1708 | unsigned int *clearing_ptr) | |
1709 | { | |
77ea887e TH |
1710 | struct gendisk *disk = ev->disk; |
1711 | char *envp[ARRAY_SIZE(disk_uevents) + 1] = { }; | |
12c2bdb2 | 1712 | unsigned int clearing = *clearing_ptr; |
77ea887e TH |
1713 | unsigned int events; |
1714 | unsigned long intv; | |
1715 | int nr_events = 0, i; | |
1716 | ||
1717 | /* check events */ | |
1718 | events = disk->fops->check_events(disk, clearing); | |
1719 | ||
1720 | /* accumulate pending events and schedule next poll if necessary */ | |
1721 | spin_lock_irq(&ev->lock); | |
1722 | ||
1723 | events &= ~ev->pending; | |
1724 | ev->pending |= events; | |
12c2bdb2 | 1725 | *clearing_ptr &= ~clearing; |
77ea887e TH |
1726 | |
1727 | intv = disk_events_poll_jiffies(disk); | |
1728 | if (!ev->block && intv) | |
695588f9 VK |
1729 | queue_delayed_work(system_freezable_power_efficient_wq, |
1730 | &ev->dwork, intv); | |
77ea887e TH |
1731 | |
1732 | spin_unlock_irq(&ev->lock); | |
1733 | ||
7c88a168 TH |
1734 | /* |
1735 | * Tell userland about new events. Only the events listed in | |
c92e2f04 MW |
1736 | * @disk->events are reported, and only if DISK_EVENT_FLAG_UEVENT |
1737 | * is set. Otherwise, events are processed internally but never | |
1738 | * get reported to userland. | |
7c88a168 | 1739 | */ |
77ea887e | 1740 | for (i = 0; i < ARRAY_SIZE(disk_uevents); i++) |
c92e2f04 MW |
1741 | if ((events & disk->events & (1 << i)) && |
1742 | (disk->event_flags & DISK_EVENT_FLAG_UEVENT)) | |
77ea887e TH |
1743 | envp[nr_events++] = disk_uevents[i]; |
1744 | ||
1745 | if (nr_events) | |
1746 | kobject_uevent_env(&disk_to_dev(disk)->kobj, KOBJ_CHANGE, envp); | |
1747 | } | |
1748 | ||
1749 | /* | |
1750 | * A disk events enabled device has the following sysfs nodes under | |
1751 | * its /sys/block/X/ directory. | |
1752 | * | |
1753 | * events : list of all supported events | |
1754 | * events_async : list of events which can be detected w/o polling | |
673387a9 | 1755 | * (always empty, only for backwards compatibility) |
77ea887e TH |
1756 | * events_poll_msecs : polling interval, 0: disable, -1: system default |
1757 | */ | |
1758 | static ssize_t __disk_events_show(unsigned int events, char *buf) | |
1759 | { | |
1760 | const char *delim = ""; | |
1761 | ssize_t pos = 0; | |
1762 | int i; | |
1763 | ||
1764 | for (i = 0; i < ARRAY_SIZE(disk_events_strs); i++) | |
1765 | if (events & (1 << i)) { | |
1766 | pos += sprintf(buf + pos, "%s%s", | |
1767 | delim, disk_events_strs[i]); | |
1768 | delim = " "; | |
1769 | } | |
1770 | if (pos) | |
1771 | pos += sprintf(buf + pos, "\n"); | |
1772 | return pos; | |
1773 | } | |
1774 | ||
1775 | static ssize_t disk_events_show(struct device *dev, | |
1776 | struct device_attribute *attr, char *buf) | |
1777 | { | |
1778 | struct gendisk *disk = dev_to_disk(dev); | |
1779 | ||
c92e2f04 MW |
1780 | if (!(disk->event_flags & DISK_EVENT_FLAG_UEVENT)) |
1781 | return 0; | |
1782 | ||
77ea887e TH |
1783 | return __disk_events_show(disk->events, buf); |
1784 | } | |
1785 | ||
1786 | static ssize_t disk_events_async_show(struct device *dev, | |
1787 | struct device_attribute *attr, char *buf) | |
1788 | { | |
673387a9 | 1789 | return 0; |
77ea887e TH |
1790 | } |
1791 | ||
1792 | static ssize_t disk_events_poll_msecs_show(struct device *dev, | |
1793 | struct device_attribute *attr, | |
1794 | char *buf) | |
1795 | { | |
1796 | struct gendisk *disk = dev_to_disk(dev); | |
1797 | ||
cdf3e3de MW |
1798 | if (!disk->ev) |
1799 | return sprintf(buf, "-1\n"); | |
1800 | ||
77ea887e TH |
1801 | return sprintf(buf, "%ld\n", disk->ev->poll_msecs); |
1802 | } | |
1803 | ||
1804 | static ssize_t disk_events_poll_msecs_store(struct device *dev, | |
1805 | struct device_attribute *attr, | |
1806 | const char *buf, size_t count) | |
1807 | { | |
1808 | struct gendisk *disk = dev_to_disk(dev); | |
1809 | long intv; | |
1810 | ||
1811 | if (!count || !sscanf(buf, "%ld", &intv)) | |
1812 | return -EINVAL; | |
1813 | ||
1814 | if (intv < 0 && intv != -1) | |
1815 | return -EINVAL; | |
1816 | ||
cdf3e3de MW |
1817 | if (!disk->ev) |
1818 | return -ENODEV; | |
1819 | ||
c3af54af | 1820 | disk_block_events(disk); |
77ea887e TH |
1821 | disk->ev->poll_msecs = intv; |
1822 | __disk_unblock_events(disk, true); | |
1823 | ||
1824 | return count; | |
1825 | } | |
1826 | ||
5657a819 JP |
1827 | static const DEVICE_ATTR(events, 0444, disk_events_show, NULL); |
1828 | static const DEVICE_ATTR(events_async, 0444, disk_events_async_show, NULL); | |
1829 | static const DEVICE_ATTR(events_poll_msecs, 0644, | |
77ea887e TH |
1830 | disk_events_poll_msecs_show, |
1831 | disk_events_poll_msecs_store); | |
1832 | ||
1833 | static const struct attribute *disk_events_attrs[] = { | |
1834 | &dev_attr_events.attr, | |
1835 | &dev_attr_events_async.attr, | |
1836 | &dev_attr_events_poll_msecs.attr, | |
1837 | NULL, | |
1838 | }; | |
1839 | ||
1840 | /* | |
1841 | * The default polling interval can be specified by the kernel | |
1842 | * parameter block.events_dfl_poll_msecs which defaults to 0 | |
1843 | * (disable). This can also be modified runtime by writing to | |
1624b0b2 | 1844 | * /sys/module/block/parameters/events_dfl_poll_msecs. |
77ea887e TH |
1845 | */ |
1846 | static int disk_events_set_dfl_poll_msecs(const char *val, | |
1847 | const struct kernel_param *kp) | |
1848 | { | |
1849 | struct disk_events *ev; | |
1850 | int ret; | |
1851 | ||
1852 | ret = param_set_ulong(val, kp); | |
1853 | if (ret < 0) | |
1854 | return ret; | |
1855 | ||
1856 | mutex_lock(&disk_events_mutex); | |
1857 | ||
1858 | list_for_each_entry(ev, &disk_events, node) | |
85ef06d1 | 1859 | disk_flush_events(ev->disk, 0); |
77ea887e TH |
1860 | |
1861 | mutex_unlock(&disk_events_mutex); | |
1862 | ||
1863 | return 0; | |
1864 | } | |
1865 | ||
1866 | static const struct kernel_param_ops disk_events_dfl_poll_msecs_param_ops = { | |
1867 | .set = disk_events_set_dfl_poll_msecs, | |
1868 | .get = param_get_ulong, | |
1869 | }; | |
1870 | ||
1871 | #undef MODULE_PARAM_PREFIX | |
1872 | #define MODULE_PARAM_PREFIX "block." | |
1873 | ||
1874 | module_param_cb(events_dfl_poll_msecs, &disk_events_dfl_poll_msecs_param_ops, | |
1875 | &disk_events_dfl_poll_msecs, 0644); | |
1876 | ||
1877 | /* | |
9f53d2fe | 1878 | * disk_{alloc|add|del|release}_events - initialize and destroy disk_events. |
77ea887e | 1879 | */ |
9f53d2fe | 1880 | static void disk_alloc_events(struct gendisk *disk) |
77ea887e TH |
1881 | { |
1882 | struct disk_events *ev; | |
1883 | ||
cdf3e3de | 1884 | if (!disk->fops->check_events || !disk->events) |
77ea887e TH |
1885 | return; |
1886 | ||
1887 | ev = kzalloc(sizeof(*ev), GFP_KERNEL); | |
1888 | if (!ev) { | |
1889 | pr_warn("%s: failed to initialize events\n", disk->disk_name); | |
1890 | return; | |
1891 | } | |
1892 | ||
77ea887e TH |
1893 | INIT_LIST_HEAD(&ev->node); |
1894 | ev->disk = disk; | |
1895 | spin_lock_init(&ev->lock); | |
fdd514e1 | 1896 | mutex_init(&ev->block_mutex); |
77ea887e TH |
1897 | ev->block = 1; |
1898 | ev->poll_msecs = -1; | |
1899 | INIT_DELAYED_WORK(&ev->dwork, disk_events_workfn); | |
1900 | ||
9f53d2fe SG |
1901 | disk->ev = ev; |
1902 | } | |
1903 | ||
1904 | static void disk_add_events(struct gendisk *disk) | |
1905 | { | |
9f53d2fe SG |
1906 | /* FIXME: error handling */ |
1907 | if (sysfs_create_files(&disk_to_dev(disk)->kobj, disk_events_attrs) < 0) | |
1908 | pr_warn("%s: failed to create sysfs files for events\n", | |
1909 | disk->disk_name); | |
1910 | ||
cdf3e3de MW |
1911 | if (!disk->ev) |
1912 | return; | |
1913 | ||
77ea887e | 1914 | mutex_lock(&disk_events_mutex); |
9f53d2fe | 1915 | list_add_tail(&disk->ev->node, &disk_events); |
77ea887e TH |
1916 | mutex_unlock(&disk_events_mutex); |
1917 | ||
1918 | /* | |
1919 | * Block count is initialized to 1 and the following initial | |
1920 | * unblock kicks it into action. | |
1921 | */ | |
1922 | __disk_unblock_events(disk, true); | |
1923 | } | |
1924 | ||
1925 | static void disk_del_events(struct gendisk *disk) | |
1926 | { | |
cdf3e3de MW |
1927 | if (disk->ev) { |
1928 | disk_block_events(disk); | |
77ea887e | 1929 | |
cdf3e3de MW |
1930 | mutex_lock(&disk_events_mutex); |
1931 | list_del_init(&disk->ev->node); | |
1932 | mutex_unlock(&disk_events_mutex); | |
1933 | } | |
77ea887e TH |
1934 | |
1935 | sysfs_remove_files(&disk_to_dev(disk)->kobj, disk_events_attrs); | |
1936 | } | |
1937 | ||
1938 | static void disk_release_events(struct gendisk *disk) | |
1939 | { | |
1940 | /* the block count should be 1 from disk_del_events() */ | |
1941 | WARN_ON_ONCE(disk->ev && disk->ev->block != 1); | |
1942 | kfree(disk->ev); | |
1943 | } |