Commit | Line | Data |
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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 | 10 | #include <linux/fs.h> |
b446b60e | 11 | #include <linux/kdev_t.h> |
1da177e4 LT |
12 | #include <linux/kernel.h> |
13 | #include <linux/blkdev.h> | |
66114cad | 14 | #include <linux/backing-dev.h> |
1da177e4 LT |
15 | #include <linux/init.h> |
16 | #include <linux/spinlock.h> | |
f500975a | 17 | #include <linux/proc_fs.h> |
1da177e4 LT |
18 | #include <linux/seq_file.h> |
19 | #include <linux/slab.h> | |
20 | #include <linux/kmod.h> | |
b81e0c23 | 21 | #include <linux/major.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> |
82d981d4 | 27 | #include <linux/part_stat.h> |
8f9e7b65 | 28 | #include "blk-throttle.h" |
1da177e4 | 29 | |
ff88972c | 30 | #include "blk.h" |
2aa7745b | 31 | #include "blk-mq-sched.h" |
8e141f9e | 32 | #include "blk-rq-qos.h" |
1059699f | 33 | #include "blk-cgroup.h" |
ff88972c | 34 | |
31eb6186 | 35 | static struct kobject *block_depr; |
1da177e4 | 36 | |
cf179948 MC |
37 | /* |
38 | * Unique, monotonically increasing sequential number associated with block | |
39 | * devices instances (i.e. incremented each time a device is attached). | |
40 | * Associating uevents with block devices in userspace is difficult and racy: | |
41 | * the uevent netlink socket is lossy, and on slow and overloaded systems has | |
42 | * a very high latency. | |
43 | * Block devices do not have exclusive owners in userspace, any process can set | |
44 | * one up (e.g. loop devices). Moreover, device names can be reused (e.g. loop0 | |
45 | * can be reused again and again). | |
46 | * A userspace process setting up a block device and watching for its events | |
47 | * cannot thus reliably tell whether an event relates to the device it just set | |
48 | * up or another earlier instance with the same name. | |
49 | * This sequential number allows userspace processes to solve this problem, and | |
50 | * uniquely associate an uevent to the lifetime to a device. | |
51 | */ | |
52 | static atomic64_t diskseq; | |
53 | ||
bcce3de1 | 54 | /* for extended dynamic devt allocation, currently only one major is used */ |
ce23bba8 | 55 | #define NR_EXT_DEVT (1 << MINORBITS) |
22ae8ce8 | 56 | static DEFINE_IDA(ext_devt_ida); |
bcce3de1 | 57 | |
a782483c CH |
58 | void set_capacity(struct gendisk *disk, sector_t sectors) |
59 | { | |
cb8432d6 | 60 | struct block_device *bdev = disk->part0; |
a782483c | 61 | |
0f472277 | 62 | spin_lock(&bdev->bd_size_lock); |
a782483c | 63 | i_size_write(bdev->bd_inode, (loff_t)sectors << SECTOR_SHIFT); |
f09313c5 | 64 | bdev->bd_nr_sectors = sectors; |
0f472277 | 65 | spin_unlock(&bdev->bd_size_lock); |
a782483c CH |
66 | } |
67 | EXPORT_SYMBOL(set_capacity); | |
68 | ||
e598a72f | 69 | /* |
449f4ec9 CH |
70 | * Set disk capacity and notify if the size is not currently zero and will not |
71 | * be set to zero. Returns true if a uevent was sent, otherwise false. | |
e598a72f | 72 | */ |
449f4ec9 | 73 | bool set_capacity_and_notify(struct gendisk *disk, sector_t size) |
e598a72f BS |
74 | { |
75 | sector_t capacity = get_capacity(disk); | |
a782483c | 76 | char *envp[] = { "RESIZE=1", NULL }; |
e598a72f BS |
77 | |
78 | set_capacity(disk, size); | |
e598a72f | 79 | |
a782483c CH |
80 | /* |
81 | * Only print a message and send a uevent if the gendisk is user visible | |
82 | * and alive. This avoids spamming the log and udev when setting the | |
83 | * initial capacity during probing. | |
84 | */ | |
85 | if (size == capacity || | |
50b4aecf CH |
86 | !disk_live(disk) || |
87 | (disk->flags & GENHD_FL_HIDDEN)) | |
a782483c | 88 | return false; |
e598a72f | 89 | |
a782483c | 90 | pr_info("%s: detected capacity change from %lld to %lld\n", |
452c0bf8 | 91 | disk->disk_name, capacity, size); |
7e890c37 | 92 | |
a782483c CH |
93 | /* |
94 | * Historically we did not send a uevent for changes to/from an empty | |
95 | * device. | |
96 | */ | |
97 | if (!capacity || !size) | |
98 | return false; | |
99 | kobject_uevent_env(&disk_to_dev(disk)->kobj, KOBJ_CHANGE, envp); | |
100 | return true; | |
e598a72f | 101 | } |
449f4ec9 | 102 | EXPORT_SYMBOL_GPL(set_capacity_and_notify); |
e598a72f | 103 | |
5cbd28e3 | 104 | /* |
abd2864a CH |
105 | * Format the device name of the indicated block device into the supplied buffer |
106 | * and return a pointer to that same buffer for convenience. | |
107 | * | |
108 | * Note: do not use this in new code, use the %pg specifier to sprintf and | |
109 | * printk insted. | |
5cbd28e3 | 110 | */ |
abd2864a | 111 | const char *bdevname(struct block_device *bdev, char *buf) |
5cbd28e3 | 112 | { |
abd2864a CH |
113 | struct gendisk *hd = bdev->bd_disk; |
114 | int partno = bdev->bd_partno; | |
115 | ||
5cbd28e3 CH |
116 | if (!partno) |
117 | snprintf(buf, BDEVNAME_SIZE, "%s", hd->disk_name); | |
118 | else if (isdigit(hd->disk_name[strlen(hd->disk_name)-1])) | |
119 | snprintf(buf, BDEVNAME_SIZE, "%sp%d", hd->disk_name, partno); | |
120 | else | |
121 | snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, partno); | |
122 | ||
123 | return buf; | |
124 | } | |
5cbd28e3 | 125 | EXPORT_SYMBOL(bdevname); |
e598a72f | 126 | |
0d02129e CH |
127 | static void part_stat_read_all(struct block_device *part, |
128 | struct disk_stats *stat) | |
ea18e0f0 KK |
129 | { |
130 | int cpu; | |
131 | ||
132 | memset(stat, 0, sizeof(struct disk_stats)); | |
133 | for_each_possible_cpu(cpu) { | |
0d02129e | 134 | struct disk_stats *ptr = per_cpu_ptr(part->bd_stats, cpu); |
ea18e0f0 KK |
135 | int group; |
136 | ||
137 | for (group = 0; group < NR_STAT_GROUPS; group++) { | |
138 | stat->nsecs[group] += ptr->nsecs[group]; | |
139 | stat->sectors[group] += ptr->sectors[group]; | |
140 | stat->ios[group] += ptr->ios[group]; | |
141 | stat->merges[group] += ptr->merges[group]; | |
142 | } | |
143 | ||
144 | stat->io_ticks += ptr->io_ticks; | |
ea18e0f0 KK |
145 | } |
146 | } | |
ea18e0f0 | 147 | |
8446fe92 | 148 | static unsigned int part_in_flight(struct block_device *part) |
f299b7c7 | 149 | { |
b2f609e1 | 150 | unsigned int inflight = 0; |
1226b8dd | 151 | int cpu; |
f299b7c7 | 152 | |
1226b8dd | 153 | for_each_possible_cpu(cpu) { |
e016b782 MP |
154 | inflight += part_stat_local_read_cpu(part, in_flight[0], cpu) + |
155 | part_stat_local_read_cpu(part, in_flight[1], cpu); | |
1226b8dd | 156 | } |
e016b782 MP |
157 | if ((int)inflight < 0) |
158 | inflight = 0; | |
1226b8dd | 159 | |
e016b782 | 160 | return inflight; |
f299b7c7 JA |
161 | } |
162 | ||
8446fe92 CH |
163 | static void part_in_flight_rw(struct block_device *part, |
164 | unsigned int inflight[2]) | |
bf0ddaba | 165 | { |
1226b8dd MP |
166 | int cpu; |
167 | ||
1226b8dd MP |
168 | inflight[0] = 0; |
169 | inflight[1] = 0; | |
170 | for_each_possible_cpu(cpu) { | |
171 | inflight[0] += part_stat_local_read_cpu(part, in_flight[0], cpu); | |
172 | inflight[1] += part_stat_local_read_cpu(part, in_flight[1], cpu); | |
173 | } | |
174 | if ((int)inflight[0] < 0) | |
175 | inflight[0] = 0; | |
176 | if ((int)inflight[1] < 0) | |
177 | inflight[1] = 0; | |
bf0ddaba OS |
178 | } |
179 | ||
1da177e4 LT |
180 | /* |
181 | * Can be deleted altogether. Later. | |
182 | * | |
183 | */ | |
133d55cd | 184 | #define BLKDEV_MAJOR_HASH_SIZE 255 |
1da177e4 LT |
185 | static struct blk_major_name { |
186 | struct blk_major_name *next; | |
187 | int major; | |
188 | char name[16]; | |
fbdee71b | 189 | #ifdef CONFIG_BLOCK_LEGACY_AUTOLOAD |
a160c615 | 190 | void (*probe)(dev_t devt); |
fbdee71b | 191 | #endif |
68eef3b4 | 192 | } *major_names[BLKDEV_MAJOR_HASH_SIZE]; |
e49fbbbf | 193 | static DEFINE_MUTEX(major_names_lock); |
dfbb3409 | 194 | static DEFINE_SPINLOCK(major_names_spinlock); |
1da177e4 LT |
195 | |
196 | /* index in the above - for now: assume no multimajor ranges */ | |
e61eb2e9 | 197 | static inline int major_to_index(unsigned major) |
1da177e4 | 198 | { |
68eef3b4 | 199 | return major % BLKDEV_MAJOR_HASH_SIZE; |
7170be5f NH |
200 | } |
201 | ||
68eef3b4 | 202 | #ifdef CONFIG_PROC_FS |
cf771cb5 | 203 | void blkdev_show(struct seq_file *seqf, off_t offset) |
7170be5f | 204 | { |
68eef3b4 | 205 | struct blk_major_name *dp; |
7170be5f | 206 | |
dfbb3409 | 207 | spin_lock(&major_names_spinlock); |
133d55cd LG |
208 | for (dp = major_names[major_to_index(offset)]; dp; dp = dp->next) |
209 | if (dp->major == offset) | |
cf771cb5 | 210 | seq_printf(seqf, "%3d %s\n", dp->major, dp->name); |
dfbb3409 | 211 | spin_unlock(&major_names_spinlock); |
1da177e4 | 212 | } |
68eef3b4 | 213 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 214 | |
9e8c0bcc | 215 | /** |
e2b6b301 | 216 | * __register_blkdev - register a new block device |
9e8c0bcc | 217 | * |
f33ff110 SB |
218 | * @major: the requested major device number [1..BLKDEV_MAJOR_MAX-1]. If |
219 | * @major = 0, try to allocate any unused major number. | |
9e8c0bcc | 220 | * @name: the name of the new block device as a zero terminated string |
26e06f5b LC |
221 | * @probe: pre-devtmpfs / pre-udev callback used to create disks when their |
222 | * pre-created device node is accessed. When a probe call uses | |
223 | * add_disk() and it fails the driver must cleanup resources. This | |
224 | * interface may soon be removed. | |
9e8c0bcc MN |
225 | * |
226 | * The @name must be unique within the system. | |
227 | * | |
0e056eb5 | 228 | * The return value depends on the @major input parameter: |
229 | * | |
f33ff110 SB |
230 | * - if a major device number was requested in range [1..BLKDEV_MAJOR_MAX-1] |
231 | * then the function returns zero on success, or a negative error code | |
0e056eb5 | 232 | * - if any unused major number was requested with @major = 0 parameter |
9e8c0bcc | 233 | * then the return value is the allocated major number in range |
f33ff110 SB |
234 | * [1..BLKDEV_MAJOR_MAX-1] or a negative error code otherwise |
235 | * | |
236 | * See Documentation/admin-guide/devices.txt for the list of allocated | |
237 | * major numbers. | |
e2b6b301 CH |
238 | * |
239 | * Use register_blkdev instead for any new code. | |
9e8c0bcc | 240 | */ |
a160c615 CH |
241 | int __register_blkdev(unsigned int major, const char *name, |
242 | void (*probe)(dev_t devt)) | |
1da177e4 LT |
243 | { |
244 | struct blk_major_name **n, *p; | |
245 | int index, ret = 0; | |
246 | ||
e49fbbbf | 247 | mutex_lock(&major_names_lock); |
1da177e4 LT |
248 | |
249 | /* temporary */ | |
250 | if (major == 0) { | |
251 | for (index = ARRAY_SIZE(major_names)-1; index > 0; index--) { | |
252 | if (major_names[index] == NULL) | |
253 | break; | |
254 | } | |
255 | ||
256 | if (index == 0) { | |
dfc76d11 KP |
257 | printk("%s: failed to get major for %s\n", |
258 | __func__, name); | |
1da177e4 LT |
259 | ret = -EBUSY; |
260 | goto out; | |
261 | } | |
262 | major = index; | |
263 | ret = major; | |
264 | } | |
265 | ||
133d55cd | 266 | if (major >= BLKDEV_MAJOR_MAX) { |
dfc76d11 KP |
267 | pr_err("%s: major requested (%u) is greater than the maximum (%u) for %s\n", |
268 | __func__, major, BLKDEV_MAJOR_MAX-1, name); | |
133d55cd LG |
269 | |
270 | ret = -EINVAL; | |
271 | goto out; | |
272 | } | |
273 | ||
1da177e4 LT |
274 | p = kmalloc(sizeof(struct blk_major_name), GFP_KERNEL); |
275 | if (p == NULL) { | |
276 | ret = -ENOMEM; | |
277 | goto out; | |
278 | } | |
279 | ||
280 | p->major = major; | |
fbdee71b | 281 | #ifdef CONFIG_BLOCK_LEGACY_AUTOLOAD |
a160c615 | 282 | p->probe = probe; |
fbdee71b | 283 | #endif |
1da177e4 LT |
284 | strlcpy(p->name, name, sizeof(p->name)); |
285 | p->next = NULL; | |
286 | index = major_to_index(major); | |
287 | ||
dfbb3409 | 288 | spin_lock(&major_names_spinlock); |
1da177e4 LT |
289 | for (n = &major_names[index]; *n; n = &(*n)->next) { |
290 | if ((*n)->major == major) | |
291 | break; | |
292 | } | |
293 | if (!*n) | |
294 | *n = p; | |
295 | else | |
296 | ret = -EBUSY; | |
dfbb3409 | 297 | spin_unlock(&major_names_spinlock); |
1da177e4 LT |
298 | |
299 | if (ret < 0) { | |
f33ff110 | 300 | printk("register_blkdev: cannot get major %u for %s\n", |
1da177e4 LT |
301 | major, name); |
302 | kfree(p); | |
303 | } | |
304 | out: | |
e49fbbbf | 305 | mutex_unlock(&major_names_lock); |
1da177e4 LT |
306 | return ret; |
307 | } | |
a160c615 | 308 | EXPORT_SYMBOL(__register_blkdev); |
1da177e4 | 309 | |
f4480240 | 310 | void unregister_blkdev(unsigned int major, const char *name) |
1da177e4 LT |
311 | { |
312 | struct blk_major_name **n; | |
313 | struct blk_major_name *p = NULL; | |
314 | int index = major_to_index(major); | |
1da177e4 | 315 | |
e49fbbbf | 316 | mutex_lock(&major_names_lock); |
dfbb3409 | 317 | spin_lock(&major_names_spinlock); |
1da177e4 LT |
318 | for (n = &major_names[index]; *n; n = &(*n)->next) |
319 | if ((*n)->major == major) | |
320 | break; | |
294462a5 AM |
321 | if (!*n || strcmp((*n)->name, name)) { |
322 | WARN_ON(1); | |
294462a5 | 323 | } else { |
1da177e4 LT |
324 | p = *n; |
325 | *n = p->next; | |
326 | } | |
dfbb3409 | 327 | spin_unlock(&major_names_spinlock); |
e49fbbbf | 328 | mutex_unlock(&major_names_lock); |
1da177e4 | 329 | kfree(p); |
1da177e4 LT |
330 | } |
331 | ||
332 | EXPORT_SYMBOL(unregister_blkdev); | |
333 | ||
7c3f828b | 334 | int blk_alloc_ext_minor(void) |
bcce3de1 | 335 | { |
bab998d6 | 336 | int idx; |
bcce3de1 | 337 | |
22ae8ce8 | 338 | idx = ida_alloc_range(&ext_devt_ida, 0, NR_EXT_DEVT, GFP_KERNEL); |
c4b2b7d1 CH |
339 | if (idx == -ENOSPC) |
340 | return -EBUSY; | |
341 | return idx; | |
bcce3de1 TH |
342 | } |
343 | ||
7c3f828b | 344 | void blk_free_ext_minor(unsigned int minor) |
bcce3de1 | 345 | { |
c4b2b7d1 | 346 | ida_free(&ext_devt_ida, minor); |
6fcc44d1 YY |
347 | } |
348 | ||
1f014290 TH |
349 | static char *bdevt_str(dev_t devt, char *buf) |
350 | { | |
351 | if (MAJOR(devt) <= 0xff && MINOR(devt) <= 0xff) { | |
352 | char tbuf[BDEVT_SIZE]; | |
353 | snprintf(tbuf, BDEVT_SIZE, "%02x%02x", MAJOR(devt), MINOR(devt)); | |
354 | snprintf(buf, BDEVT_SIZE, "%-9s", tbuf); | |
355 | } else | |
356 | snprintf(buf, BDEVT_SIZE, "%03x:%05x", MAJOR(devt), MINOR(devt)); | |
357 | ||
358 | return buf; | |
359 | } | |
360 | ||
bc359d03 CH |
361 | void disk_uevent(struct gendisk *disk, enum kobject_action action) |
362 | { | |
bc359d03 | 363 | struct block_device *part; |
3212135a | 364 | unsigned long idx; |
bc359d03 | 365 | |
3212135a CH |
366 | rcu_read_lock(); |
367 | xa_for_each(&disk->part_tbl, idx, part) { | |
368 | if (bdev_is_partition(part) && !bdev_nr_sectors(part)) | |
369 | continue; | |
498dcc13 | 370 | if (!kobject_get_unless_zero(&part->bd_device.kobj)) |
3212135a CH |
371 | continue; |
372 | ||
373 | rcu_read_unlock(); | |
bc359d03 | 374 | kobject_uevent(bdev_kobj(part), action); |
498dcc13 | 375 | put_device(&part->bd_device); |
3212135a CH |
376 | rcu_read_lock(); |
377 | } | |
378 | rcu_read_unlock(); | |
bc359d03 CH |
379 | } |
380 | EXPORT_SYMBOL_GPL(disk_uevent); | |
381 | ||
e16e506c | 382 | int disk_scan_partitions(struct gendisk *disk, fmode_t mode) |
9301fe73 CH |
383 | { |
384 | struct block_device *bdev; | |
385 | ||
9f18db57 | 386 | if (disk->flags & (GENHD_FL_NO_PART | GENHD_FL_HIDDEN)) |
e16e506c CH |
387 | return -EINVAL; |
388 | if (disk->open_partitions) | |
389 | return -EBUSY; | |
9301fe73 CH |
390 | |
391 | set_bit(GD_NEED_PART_SCAN, &disk->state); | |
e16e506c CH |
392 | bdev = blkdev_get_by_dev(disk_devt(disk), mode, NULL); |
393 | if (IS_ERR(bdev)) | |
394 | return PTR_ERR(bdev); | |
395 | blkdev_put(bdev, mode); | |
396 | return 0; | |
9301fe73 CH |
397 | } |
398 | ||
1da177e4 | 399 | /** |
d1254a87 | 400 | * device_add_disk - add disk information to kernel list |
e63a46be | 401 | * @parent: parent device for the disk |
1da177e4 | 402 | * @disk: per-device partitioning information |
fef912bf | 403 | * @groups: Additional per-device sysfs groups |
1da177e4 LT |
404 | * |
405 | * This function registers the partitioning information in @disk | |
406 | * with the kernel. | |
407 | */ | |
278167fd LC |
408 | int __must_check device_add_disk(struct device *parent, struct gendisk *disk, |
409 | const struct attribute_group **groups) | |
d1254a87 | 410 | |
1da177e4 | 411 | { |
52b85909 | 412 | struct device *ddev = disk_to_dev(disk); |
7c3f828b | 413 | int ret; |
cf0ca9fe | 414 | |
737eb78e DLM |
415 | /* |
416 | * The disk queue should now be all set with enough information about | |
417 | * the device for the elevator code to pick an adequate default | |
418 | * elevator if one is needed, that is, for devices requesting queue | |
419 | * registration. | |
420 | */ | |
d1254a87 | 421 | elevator_init_mq(disk->queue); |
737eb78e | 422 | |
7c3f828b CH |
423 | /* |
424 | * If the driver provides an explicit major number it also must provide | |
425 | * the number of minors numbers supported, and those will be used to | |
426 | * setup the gendisk. | |
427 | * Otherwise just allocate the device numbers for both the whole device | |
428 | * and all partitions from the extended dev_t space. | |
3e1a7ff8 | 429 | */ |
7c3f828b | 430 | if (disk->major) { |
83cbce95 LC |
431 | if (WARN_ON(!disk->minors)) |
432 | return -EINVAL; | |
2e3c73fa CH |
433 | |
434 | if (disk->minors > DISK_MAX_PARTS) { | |
435 | pr_err("block: can't allocate more than %d partitions\n", | |
436 | DISK_MAX_PARTS); | |
437 | disk->minors = DISK_MAX_PARTS; | |
438 | } | |
e338924b TH |
439 | if (disk->first_minor + disk->minors > MINORMASK + 1) |
440 | return -EINVAL; | |
7c3f828b | 441 | } else { |
83cbce95 LC |
442 | if (WARN_ON(disk->minors)) |
443 | return -EINVAL; | |
3e1a7ff8 | 444 | |
7c3f828b | 445 | ret = blk_alloc_ext_minor(); |
83cbce95 LC |
446 | if (ret < 0) |
447 | return ret; | |
7c3f828b | 448 | disk->major = BLOCK_EXT_MAJOR; |
539711d7 | 449 | disk->first_minor = ret; |
3e1a7ff8 | 450 | } |
7c3f828b | 451 | |
52b85909 CH |
452 | /* delay uevents, until we scanned partition table */ |
453 | dev_set_uevent_suppress(ddev, 1); | |
454 | ||
455 | ddev->parent = parent; | |
456 | ddev->groups = groups; | |
457 | dev_set_name(ddev, "%s", disk->disk_name); | |
8235b5c1 CH |
458 | if (!(disk->flags & GENHD_FL_HIDDEN)) |
459 | ddev->devt = MKDEV(disk->major, disk->first_minor); | |
83cbce95 LC |
460 | ret = device_add(ddev); |
461 | if (ret) | |
99d8690a CH |
462 | goto out_free_ext_minor; |
463 | ||
464 | ret = disk_alloc_events(disk); | |
465 | if (ret) | |
466 | goto out_device_del; | |
467 | ||
52b85909 CH |
468 | if (!sysfs_deprecated) { |
469 | ret = sysfs_create_link(block_depr, &ddev->kobj, | |
470 | kobject_name(&ddev->kobj)); | |
83cbce95 LC |
471 | if (ret) |
472 | goto out_device_del; | |
52b85909 CH |
473 | } |
474 | ||
475 | /* | |
476 | * avoid probable deadlock caused by allocating memory with | |
477 | * GFP_KERNEL in runtime_resume callback of its all ancestor | |
478 | * devices | |
479 | */ | |
480 | pm_runtime_set_memalloc_noio(ddev, true); | |
481 | ||
83cbce95 LC |
482 | ret = blk_integrity_add(disk); |
483 | if (ret) | |
484 | goto out_del_block_link; | |
bab53f6b | 485 | |
52b85909 CH |
486 | disk->part0->bd_holder_dir = |
487 | kobject_create_and_add("holders", &ddev->kobj); | |
fe7d064f LC |
488 | if (!disk->part0->bd_holder_dir) { |
489 | ret = -ENOMEM; | |
83cbce95 | 490 | goto out_del_integrity; |
fe7d064f | 491 | } |
52b85909 | 492 | disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj); |
fe7d064f LC |
493 | if (!disk->slave_dir) { |
494 | ret = -ENOMEM; | |
83cbce95 | 495 | goto out_put_holder_dir; |
fe7d064f | 496 | } |
52b85909 | 497 | |
83cbce95 LC |
498 | ret = bd_register_pending_holders(disk); |
499 | if (ret < 0) | |
500 | goto out_put_slave_dir; | |
52b85909 | 501 | |
83cbce95 LC |
502 | ret = blk_register_queue(disk); |
503 | if (ret) | |
504 | goto out_put_slave_dir; | |
75f4dca5 | 505 | |
9f18db57 | 506 | if (!(disk->flags & GENHD_FL_HIDDEN)) { |
8235b5c1 CH |
507 | ret = bdi_register(disk->bdi, "%u:%u", |
508 | disk->major, disk->first_minor); | |
83cbce95 LC |
509 | if (ret) |
510 | goto out_unregister_queue; | |
8235b5c1 | 511 | bdi_set_owner(disk->bdi, ddev); |
83cbce95 LC |
512 | ret = sysfs_create_link(&ddev->kobj, |
513 | &disk->bdi->dev->kobj, "bdi"); | |
514 | if (ret) | |
515 | goto out_unregister_bdi; | |
8235b5c1 | 516 | |
9d5ee676 | 517 | bdev_add(disk->part0, ddev->devt); |
e16e506c CH |
518 | if (get_capacity(disk)) |
519 | disk_scan_partitions(disk, FMODE_READ); | |
52b85909 CH |
520 | |
521 | /* | |
522 | * Announce the disk and partitions after all partitions are | |
8235b5c1 | 523 | * created. (for hidden disks uevents remain suppressed forever) |
52b85909 CH |
524 | */ |
525 | dev_set_uevent_suppress(ddev, 0); | |
526 | disk_uevent(disk, KOBJ_ADD); | |
52b85909 CH |
527 | } |
528 | ||
75f4dca5 | 529 | disk_update_readahead(disk); |
77ea887e | 530 | disk_add_events(disk); |
76792055 | 531 | set_bit(GD_ADDED, &disk->state); |
83cbce95 LC |
532 | return 0; |
533 | ||
534 | out_unregister_bdi: | |
535 | if (!(disk->flags & GENHD_FL_HIDDEN)) | |
536 | bdi_unregister(disk->bdi); | |
537 | out_unregister_queue: | |
538 | blk_unregister_queue(disk); | |
539 | out_put_slave_dir: | |
540 | kobject_put(disk->slave_dir); | |
541 | out_put_holder_dir: | |
542 | kobject_put(disk->part0->bd_holder_dir); | |
543 | out_del_integrity: | |
544 | blk_integrity_del(disk); | |
545 | out_del_block_link: | |
546 | if (!sysfs_deprecated) | |
547 | sysfs_remove_link(block_depr, dev_name(ddev)); | |
548 | out_device_del: | |
549 | device_del(ddev); | |
83cbce95 LC |
550 | out_free_ext_minor: |
551 | if (disk->major == BLOCK_EXT_MAJOR) | |
552 | blk_free_ext_minor(disk->first_minor); | |
278167fd | 553 | return ret; |
1da177e4 | 554 | } |
e63a46be | 555 | EXPORT_SYMBOL(device_add_disk); |
1da177e4 | 556 | |
b5bd357c LC |
557 | /** |
558 | * del_gendisk - remove the gendisk | |
559 | * @disk: the struct gendisk to remove | |
560 | * | |
561 | * Removes the gendisk and all its associated resources. This deletes the | |
562 | * partitions associated with the gendisk, and unregisters the associated | |
563 | * request_queue. | |
564 | * | |
565 | * This is the counter to the respective __device_add_disk() call. | |
566 | * | |
567 | * The final removal of the struct gendisk happens when its refcount reaches 0 | |
568 | * with put_disk(), which should be called after del_gendisk(), if | |
569 | * __device_add_disk() was used. | |
e8c7d14a LC |
570 | * |
571 | * Drivers exist which depend on the release of the gendisk to be synchronous, | |
572 | * it should not be deferred. | |
573 | * | |
574 | * Context: can sleep | |
b5bd357c | 575 | */ |
d2bf1b67 | 576 | void del_gendisk(struct gendisk *disk) |
1da177e4 | 577 | { |
8e141f9e CH |
578 | struct request_queue *q = disk->queue; |
579 | ||
e8c7d14a LC |
580 | might_sleep(); |
581 | ||
9f286992 | 582 | if (WARN_ON_ONCE(!disk_live(disk) && !(disk->flags & GENHD_FL_HIDDEN))) |
6b3ba976 CH |
583 | return; |
584 | ||
25520d55 | 585 | blk_integrity_del(disk); |
77ea887e TH |
586 | disk_del_events(disk); |
587 | ||
a8698707 | 588 | mutex_lock(&disk->open_mutex); |
d7a66574 | 589 | remove_inode_hash(disk->part0->bd_inode); |
d3c4a43d | 590 | blk_drop_partitions(disk); |
a8698707 | 591 | mutex_unlock(&disk->open_mutex); |
c76f48eb | 592 | |
45611837 CH |
593 | fsync_bdev(disk->part0); |
594 | __invalidate_device(disk->part0, true); | |
595 | ||
8e141f9e CH |
596 | /* |
597 | * Fail any new I/O. | |
598 | */ | |
599 | set_bit(GD_DEAD, &disk->state); | |
d2bf1b67 | 600 | set_capacity(disk, 0); |
d2bf1b67 | 601 | |
8e141f9e CH |
602 | /* |
603 | * Prevent new I/O from crossing bio_queue_enter(). | |
604 | */ | |
605 | blk_queue_start_drain(q); | |
8e141f9e | 606 | |
6b3ba976 | 607 | if (!(disk->flags & GENHD_FL_HIDDEN)) { |
8ddcd653 | 608 | sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi"); |
6b3ba976 | 609 | |
90f16fdd JK |
610 | /* |
611 | * Unregister bdi before releasing device numbers (as they can | |
612 | * get reused and we'd get clashes in sysfs). | |
613 | */ | |
edb0872f | 614 | bdi_unregister(disk->bdi); |
90f16fdd | 615 | } |
d2bf1b67 | 616 | |
6b3ba976 | 617 | blk_unregister_queue(disk); |
d2bf1b67 | 618 | |
cb8432d6 | 619 | kobject_put(disk->part0->bd_holder_dir); |
d2bf1b67 | 620 | kobject_put(disk->slave_dir); |
d2bf1b67 | 621 | |
8446fe92 | 622 | part_stat_set_all(disk->part0, 0); |
cb8432d6 | 623 | disk->part0->bd_stamp = 0; |
d2bf1b67 TH |
624 | if (!sysfs_deprecated) |
625 | sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk))); | |
25e823c8 | 626 | pm_runtime_set_memalloc_noio(disk_to_dev(disk), false); |
d2bf1b67 | 627 | device_del(disk_to_dev(disk)); |
d308ae0d ML |
628 | |
629 | blk_mq_freeze_queue_wait(q); | |
630 | ||
8f9e7b65 YK |
631 | blk_throtl_cancel_bios(disk->queue); |
632 | ||
d308ae0d ML |
633 | blk_sync_queue(q); |
634 | blk_flush_integrity(); | |
635 | /* | |
636 | * Allow using passthrough request again after the queue is torn down. | |
637 | */ | |
638 | blk_queue_flag_clear(QUEUE_FLAG_INIT_DONE, q); | |
639 | __blk_mq_unfreeze_queue(q, true); | |
640 | ||
1da177e4 | 641 | } |
d2bf1b67 | 642 | EXPORT_SYMBOL(del_gendisk); |
1da177e4 | 643 | |
f059a1d2 XY |
644 | /** |
645 | * invalidate_disk - invalidate the disk | |
646 | * @disk: the struct gendisk to invalidate | |
647 | * | |
648 | * A helper to invalidates the disk. It will clean the disk's associated | |
649 | * buffer/page caches and reset its internal states so that the disk | |
650 | * can be reused by the drivers. | |
651 | * | |
652 | * Context: can sleep | |
653 | */ | |
654 | void invalidate_disk(struct gendisk *disk) | |
655 | { | |
656 | struct block_device *bdev = disk->part0; | |
657 | ||
658 | invalidate_bdev(bdev); | |
659 | bdev->bd_inode->i_mapping->wb_err = 0; | |
660 | set_capacity(disk, 0); | |
661 | } | |
662 | EXPORT_SYMBOL(invalidate_disk); | |
663 | ||
99e6608c VV |
664 | /* sysfs access to bad-blocks list. */ |
665 | static ssize_t disk_badblocks_show(struct device *dev, | |
666 | struct device_attribute *attr, | |
667 | char *page) | |
668 | { | |
669 | struct gendisk *disk = dev_to_disk(dev); | |
670 | ||
671 | if (!disk->bb) | |
672 | return sprintf(page, "\n"); | |
673 | ||
674 | return badblocks_show(disk->bb, page, 0); | |
675 | } | |
676 | ||
677 | static ssize_t disk_badblocks_store(struct device *dev, | |
678 | struct device_attribute *attr, | |
679 | const char *page, size_t len) | |
680 | { | |
681 | struct gendisk *disk = dev_to_disk(dev); | |
682 | ||
683 | if (!disk->bb) | |
684 | return -ENXIO; | |
685 | ||
686 | return badblocks_store(disk->bb, page, len, 0); | |
687 | } | |
688 | ||
fbdee71b | 689 | #ifdef CONFIG_BLOCK_LEGACY_AUTOLOAD |
22ae8ce8 | 690 | void blk_request_module(dev_t devt) |
bd8eff3b | 691 | { |
a160c615 CH |
692 | unsigned int major = MAJOR(devt); |
693 | struct blk_major_name **n; | |
694 | ||
695 | mutex_lock(&major_names_lock); | |
696 | for (n = &major_names[major_to_index(major)]; *n; n = &(*n)->next) { | |
697 | if ((*n)->major == major && (*n)->probe) { | |
698 | (*n)->probe(devt); | |
699 | mutex_unlock(&major_names_lock); | |
700 | return; | |
701 | } | |
702 | } | |
703 | mutex_unlock(&major_names_lock); | |
704 | ||
bd8eff3b CH |
705 | if (request_module("block-major-%d-%d", MAJOR(devt), MINOR(devt)) > 0) |
706 | /* Make old-style 2.4 aliases work */ | |
707 | request_module("block-major-%d", MAJOR(devt)); | |
708 | } | |
fbdee71b | 709 | #endif /* CONFIG_BLOCK_LEGACY_AUTOLOAD */ |
bd8eff3b | 710 | |
5c6f35c5 GKH |
711 | /* |
712 | * print a full list of all partitions - intended for places where the root | |
713 | * filesystem can't be mounted and thus to give the victim some idea of what | |
714 | * went wrong | |
715 | */ | |
716 | void __init printk_all_partitions(void) | |
717 | { | |
def4e38d TH |
718 | struct class_dev_iter iter; |
719 | struct device *dev; | |
720 | ||
721 | class_dev_iter_init(&iter, &block_class, NULL, &disk_type); | |
722 | while ((dev = class_dev_iter_next(&iter))) { | |
723 | struct gendisk *disk = dev_to_disk(dev); | |
ad1eaa53 | 724 | struct block_device *part; |
1f014290 | 725 | char devt_buf[BDEVT_SIZE]; |
e559f58d | 726 | unsigned long idx; |
def4e38d TH |
727 | |
728 | /* | |
729 | * Don't show empty devices or things that have been | |
25985edc | 730 | * suppressed |
def4e38d | 731 | */ |
3b5149ac | 732 | if (get_capacity(disk) == 0 || (disk->flags & GENHD_FL_HIDDEN)) |
def4e38d TH |
733 | continue; |
734 | ||
735 | /* | |
e559f58d CH |
736 | * Note, unlike /proc/partitions, I am showing the numbers in |
737 | * hex - the same format as the root= option takes. | |
def4e38d | 738 | */ |
e559f58d CH |
739 | rcu_read_lock(); |
740 | xa_for_each(&disk->part_tbl, idx, part) { | |
741 | if (!bdev_nr_sectors(part)) | |
742 | continue; | |
a9e7bc3d | 743 | printk("%s%s %10llu %pg %s", |
e559f58d | 744 | bdev_is_partition(part) ? " " : "", |
ad1eaa53 | 745 | bdevt_str(part->bd_dev, devt_buf), |
a9e7bc3d | 746 | bdev_nr_sectors(part) >> 1, part, |
ad1eaa53 CH |
747 | part->bd_meta_info ? |
748 | part->bd_meta_info->uuid : ""); | |
e559f58d | 749 | if (bdev_is_partition(part)) |
074a7aca | 750 | printk("\n"); |
e559f58d CH |
751 | else if (dev->parent && dev->parent->driver) |
752 | printk(" driver: %s\n", | |
753 | dev->parent->driver->name); | |
754 | else | |
755 | printk(" (driver?)\n"); | |
074a7aca | 756 | } |
e559f58d | 757 | rcu_read_unlock(); |
def4e38d TH |
758 | } |
759 | class_dev_iter_exit(&iter); | |
dd2a345f DG |
760 | } |
761 | ||
1da177e4 LT |
762 | #ifdef CONFIG_PROC_FS |
763 | /* iterator */ | |
def4e38d | 764 | static void *disk_seqf_start(struct seq_file *seqf, loff_t *pos) |
68c4d4a7 | 765 | { |
def4e38d TH |
766 | loff_t skip = *pos; |
767 | struct class_dev_iter *iter; | |
768 | struct device *dev; | |
68c4d4a7 | 769 | |
aeb3d3a8 | 770 | iter = kmalloc(sizeof(*iter), GFP_KERNEL); |
def4e38d TH |
771 | if (!iter) |
772 | return ERR_PTR(-ENOMEM); | |
773 | ||
774 | seqf->private = iter; | |
775 | class_dev_iter_init(iter, &block_class, NULL, &disk_type); | |
776 | do { | |
777 | dev = class_dev_iter_next(iter); | |
778 | if (!dev) | |
779 | return NULL; | |
780 | } while (skip--); | |
781 | ||
782 | return dev_to_disk(dev); | |
68c4d4a7 GKH |
783 | } |
784 | ||
def4e38d | 785 | static void *disk_seqf_next(struct seq_file *seqf, void *v, loff_t *pos) |
1da177e4 | 786 | { |
edfaa7c3 | 787 | struct device *dev; |
1da177e4 | 788 | |
def4e38d TH |
789 | (*pos)++; |
790 | dev = class_dev_iter_next(seqf->private); | |
2ac3cee5 | 791 | if (dev) |
68c4d4a7 | 792 | return dev_to_disk(dev); |
2ac3cee5 | 793 | |
1da177e4 LT |
794 | return NULL; |
795 | } | |
796 | ||
def4e38d | 797 | static void disk_seqf_stop(struct seq_file *seqf, void *v) |
27f30251 | 798 | { |
def4e38d | 799 | struct class_dev_iter *iter = seqf->private; |
27f30251 | 800 | |
def4e38d TH |
801 | /* stop is called even after start failed :-( */ |
802 | if (iter) { | |
803 | class_dev_iter_exit(iter); | |
804 | kfree(iter); | |
77da1605 | 805 | seqf->private = NULL; |
5c0ef6d0 | 806 | } |
1da177e4 LT |
807 | } |
808 | ||
def4e38d | 809 | static void *show_partition_start(struct seq_file *seqf, loff_t *pos) |
1da177e4 | 810 | { |
06768067 | 811 | void *p; |
def4e38d TH |
812 | |
813 | p = disk_seqf_start(seqf, pos); | |
b9f985b6 | 814 | if (!IS_ERR_OR_NULL(p) && !*pos) |
def4e38d TH |
815 | seq_puts(seqf, "major minor #blocks name\n\n"); |
816 | return p; | |
1da177e4 LT |
817 | } |
818 | ||
cf771cb5 | 819 | static int show_partition(struct seq_file *seqf, void *v) |
1da177e4 LT |
820 | { |
821 | struct gendisk *sgp = v; | |
ad1eaa53 | 822 | struct block_device *part; |
ecc75a98 | 823 | unsigned long idx; |
1da177e4 | 824 | |
3b5149ac | 825 | if (!get_capacity(sgp) || (sgp->flags & GENHD_FL_HIDDEN)) |
1da177e4 LT |
826 | return 0; |
827 | ||
ecc75a98 CH |
828 | rcu_read_lock(); |
829 | xa_for_each(&sgp->part_tbl, idx, part) { | |
830 | if (!bdev_nr_sectors(part)) | |
831 | continue; | |
a291bb43 | 832 | seq_printf(seqf, "%4d %7d %10llu %pg\n", |
ad1eaa53 | 833 | MAJOR(part->bd_dev), MINOR(part->bd_dev), |
a291bb43 | 834 | bdev_nr_sectors(part) >> 1, part); |
ecc75a98 CH |
835 | } |
836 | rcu_read_unlock(); | |
1da177e4 LT |
837 | return 0; |
838 | } | |
839 | ||
f500975a | 840 | static const struct seq_operations partitions_op = { |
def4e38d TH |
841 | .start = show_partition_start, |
842 | .next = disk_seqf_next, | |
843 | .stop = disk_seqf_stop, | |
edfaa7c3 | 844 | .show = show_partition |
1da177e4 LT |
845 | }; |
846 | #endif | |
847 | ||
1da177e4 LT |
848 | static int __init genhd_device_init(void) |
849 | { | |
e105b8bf DW |
850 | int error; |
851 | ||
852 | block_class.dev_kobj = sysfs_dev_block_kobj; | |
853 | error = class_register(&block_class); | |
ee27a558 RM |
854 | if (unlikely(error)) |
855 | return error; | |
1da177e4 | 856 | blk_dev_init(); |
edfaa7c3 | 857 | |
561ec68e ZY |
858 | register_blkdev(BLOCK_EXT_MAJOR, "blkext"); |
859 | ||
edfaa7c3 | 860 | /* create top-level block dir */ |
e52eec13 AK |
861 | if (!sysfs_deprecated) |
862 | block_depr = kobject_create_and_add("block", NULL); | |
830d3cfb | 863 | return 0; |
1da177e4 LT |
864 | } |
865 | ||
866 | subsys_initcall(genhd_device_init); | |
867 | ||
edfaa7c3 KS |
868 | static ssize_t disk_range_show(struct device *dev, |
869 | struct device_attribute *attr, char *buf) | |
1da177e4 | 870 | { |
edfaa7c3 | 871 | struct gendisk *disk = dev_to_disk(dev); |
1da177e4 | 872 | |
edfaa7c3 | 873 | return sprintf(buf, "%d\n", disk->minors); |
1da177e4 LT |
874 | } |
875 | ||
1f014290 TH |
876 | static ssize_t disk_ext_range_show(struct device *dev, |
877 | struct device_attribute *attr, char *buf) | |
878 | { | |
879 | struct gendisk *disk = dev_to_disk(dev); | |
880 | ||
1ebe2e5f CH |
881 | return sprintf(buf, "%d\n", |
882 | (disk->flags & GENHD_FL_NO_PART) ? 1 : DISK_MAX_PARTS); | |
1f014290 TH |
883 | } |
884 | ||
edfaa7c3 KS |
885 | static ssize_t disk_removable_show(struct device *dev, |
886 | struct device_attribute *attr, char *buf) | |
a7fd6706 | 887 | { |
edfaa7c3 | 888 | struct gendisk *disk = dev_to_disk(dev); |
a7fd6706 | 889 | |
edfaa7c3 KS |
890 | return sprintf(buf, "%d\n", |
891 | (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0)); | |
a7fd6706 KS |
892 | } |
893 | ||
8ddcd653 CH |
894 | static ssize_t disk_hidden_show(struct device *dev, |
895 | struct device_attribute *attr, char *buf) | |
896 | { | |
897 | struct gendisk *disk = dev_to_disk(dev); | |
898 | ||
899 | return sprintf(buf, "%d\n", | |
900 | (disk->flags & GENHD_FL_HIDDEN ? 1 : 0)); | |
901 | } | |
902 | ||
1c9ce527 KS |
903 | static ssize_t disk_ro_show(struct device *dev, |
904 | struct device_attribute *attr, char *buf) | |
905 | { | |
906 | struct gendisk *disk = dev_to_disk(dev); | |
907 | ||
b7db9956 | 908 | return sprintf(buf, "%d\n", get_disk_ro(disk) ? 1 : 0); |
1c9ce527 KS |
909 | } |
910 | ||
3ad5cee5 CH |
911 | ssize_t part_size_show(struct device *dev, |
912 | struct device_attribute *attr, char *buf) | |
913 | { | |
0d02129e | 914 | return sprintf(buf, "%llu\n", bdev_nr_sectors(dev_to_bdev(dev))); |
3ad5cee5 CH |
915 | } |
916 | ||
917 | ssize_t part_stat_show(struct device *dev, | |
918 | struct device_attribute *attr, char *buf) | |
919 | { | |
0d02129e | 920 | struct block_device *bdev = dev_to_bdev(dev); |
ed6cddef | 921 | struct request_queue *q = bdev_get_queue(bdev); |
ea18e0f0 | 922 | struct disk_stats stat; |
3ad5cee5 CH |
923 | unsigned int inflight; |
924 | ||
b2f609e1 | 925 | if (queue_is_mq(q)) |
0d02129e | 926 | inflight = blk_mq_in_flight(q, bdev); |
b2f609e1 | 927 | else |
0d02129e | 928 | inflight = part_in_flight(bdev); |
ea18e0f0 | 929 | |
86d73312 ZW |
930 | if (inflight) { |
931 | part_stat_lock(); | |
932 | update_io_ticks(bdev, jiffies, true); | |
933 | part_stat_unlock(); | |
934 | } | |
935 | part_stat_read_all(bdev, &stat); | |
3ad5cee5 CH |
936 | return sprintf(buf, |
937 | "%8lu %8lu %8llu %8u " | |
938 | "%8lu %8lu %8llu %8u " | |
939 | "%8u %8u %8u " | |
940 | "%8lu %8lu %8llu %8u " | |
941 | "%8lu %8u" | |
942 | "\n", | |
ea18e0f0 KK |
943 | stat.ios[STAT_READ], |
944 | stat.merges[STAT_READ], | |
945 | (unsigned long long)stat.sectors[STAT_READ], | |
946 | (unsigned int)div_u64(stat.nsecs[STAT_READ], NSEC_PER_MSEC), | |
947 | stat.ios[STAT_WRITE], | |
948 | stat.merges[STAT_WRITE], | |
949 | (unsigned long long)stat.sectors[STAT_WRITE], | |
950 | (unsigned int)div_u64(stat.nsecs[STAT_WRITE], NSEC_PER_MSEC), | |
3ad5cee5 | 951 | inflight, |
ea18e0f0 | 952 | jiffies_to_msecs(stat.io_ticks), |
8cd5b8fc KK |
953 | (unsigned int)div_u64(stat.nsecs[STAT_READ] + |
954 | stat.nsecs[STAT_WRITE] + | |
955 | stat.nsecs[STAT_DISCARD] + | |
956 | stat.nsecs[STAT_FLUSH], | |
957 | NSEC_PER_MSEC), | |
ea18e0f0 KK |
958 | stat.ios[STAT_DISCARD], |
959 | stat.merges[STAT_DISCARD], | |
960 | (unsigned long long)stat.sectors[STAT_DISCARD], | |
961 | (unsigned int)div_u64(stat.nsecs[STAT_DISCARD], NSEC_PER_MSEC), | |
962 | stat.ios[STAT_FLUSH], | |
963 | (unsigned int)div_u64(stat.nsecs[STAT_FLUSH], NSEC_PER_MSEC)); | |
3ad5cee5 CH |
964 | } |
965 | ||
966 | ssize_t part_inflight_show(struct device *dev, struct device_attribute *attr, | |
967 | char *buf) | |
968 | { | |
0d02129e | 969 | struct block_device *bdev = dev_to_bdev(dev); |
ed6cddef | 970 | struct request_queue *q = bdev_get_queue(bdev); |
3ad5cee5 CH |
971 | unsigned int inflight[2]; |
972 | ||
b2f609e1 | 973 | if (queue_is_mq(q)) |
0d02129e | 974 | blk_mq_in_flight_rw(q, bdev, inflight); |
b2f609e1 | 975 | else |
0d02129e | 976 | part_in_flight_rw(bdev, inflight); |
b2f609e1 | 977 | |
3ad5cee5 CH |
978 | return sprintf(buf, "%8u %8u\n", inflight[0], inflight[1]); |
979 | } | |
980 | ||
edfaa7c3 KS |
981 | static ssize_t disk_capability_show(struct device *dev, |
982 | struct device_attribute *attr, char *buf) | |
86ce18d7 | 983 | { |
edfaa7c3 KS |
984 | struct gendisk *disk = dev_to_disk(dev); |
985 | ||
986 | return sprintf(buf, "%x\n", disk->flags); | |
86ce18d7 | 987 | } |
edfaa7c3 | 988 | |
c72758f3 MP |
989 | static ssize_t disk_alignment_offset_show(struct device *dev, |
990 | struct device_attribute *attr, | |
991 | char *buf) | |
992 | { | |
993 | struct gendisk *disk = dev_to_disk(dev); | |
994 | ||
995 | return sprintf(buf, "%d\n", queue_alignment_offset(disk->queue)); | |
996 | } | |
997 | ||
86b37281 MP |
998 | static ssize_t disk_discard_alignment_show(struct device *dev, |
999 | struct device_attribute *attr, | |
1000 | char *buf) | |
1001 | { | |
1002 | struct gendisk *disk = dev_to_disk(dev); | |
1003 | ||
dd3d145d | 1004 | return sprintf(buf, "%d\n", queue_discard_alignment(disk->queue)); |
86b37281 MP |
1005 | } |
1006 | ||
13927b31 MC |
1007 | static ssize_t diskseq_show(struct device *dev, |
1008 | struct device_attribute *attr, char *buf) | |
1009 | { | |
1010 | struct gendisk *disk = dev_to_disk(dev); | |
1011 | ||
1012 | return sprintf(buf, "%llu\n", disk->diskseq); | |
1013 | } | |
1014 | ||
5657a819 JP |
1015 | static DEVICE_ATTR(range, 0444, disk_range_show, NULL); |
1016 | static DEVICE_ATTR(ext_range, 0444, disk_ext_range_show, NULL); | |
1017 | static DEVICE_ATTR(removable, 0444, disk_removable_show, NULL); | |
1018 | static DEVICE_ATTR(hidden, 0444, disk_hidden_show, NULL); | |
1019 | static DEVICE_ATTR(ro, 0444, disk_ro_show, NULL); | |
1020 | static DEVICE_ATTR(size, 0444, part_size_show, NULL); | |
1021 | static DEVICE_ATTR(alignment_offset, 0444, disk_alignment_offset_show, NULL); | |
1022 | static DEVICE_ATTR(discard_alignment, 0444, disk_discard_alignment_show, NULL); | |
1023 | static DEVICE_ATTR(capability, 0444, disk_capability_show, NULL); | |
1024 | static DEVICE_ATTR(stat, 0444, part_stat_show, NULL); | |
1025 | static DEVICE_ATTR(inflight, 0444, part_inflight_show, NULL); | |
1026 | static DEVICE_ATTR(badblocks, 0644, disk_badblocks_show, disk_badblocks_store); | |
13927b31 | 1027 | static DEVICE_ATTR(diskseq, 0444, diskseq_show, NULL); |
3ad5cee5 | 1028 | |
c17bb495 | 1029 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
3ad5cee5 CH |
1030 | ssize_t part_fail_show(struct device *dev, |
1031 | struct device_attribute *attr, char *buf) | |
1032 | { | |
0d02129e | 1033 | return sprintf(buf, "%d\n", dev_to_bdev(dev)->bd_make_it_fail); |
3ad5cee5 CH |
1034 | } |
1035 | ||
1036 | ssize_t part_fail_store(struct device *dev, | |
1037 | struct device_attribute *attr, | |
1038 | const char *buf, size_t count) | |
1039 | { | |
3ad5cee5 CH |
1040 | int i; |
1041 | ||
1042 | if (count > 0 && sscanf(buf, "%d", &i) > 0) | |
0d02129e | 1043 | dev_to_bdev(dev)->bd_make_it_fail = i; |
3ad5cee5 CH |
1044 | |
1045 | return count; | |
1046 | } | |
1047 | ||
edfaa7c3 | 1048 | static struct device_attribute dev_attr_fail = |
5657a819 | 1049 | __ATTR(make-it-fail, 0644, part_fail_show, part_fail_store); |
3ad5cee5 CH |
1050 | #endif /* CONFIG_FAIL_MAKE_REQUEST */ |
1051 | ||
581d4e28 JA |
1052 | #ifdef CONFIG_FAIL_IO_TIMEOUT |
1053 | static struct device_attribute dev_attr_fail_timeout = | |
5657a819 | 1054 | __ATTR(io-timeout-fail, 0644, part_timeout_show, part_timeout_store); |
581d4e28 | 1055 | #endif |
edfaa7c3 KS |
1056 | |
1057 | static struct attribute *disk_attrs[] = { | |
1058 | &dev_attr_range.attr, | |
1f014290 | 1059 | &dev_attr_ext_range.attr, |
edfaa7c3 | 1060 | &dev_attr_removable.attr, |
8ddcd653 | 1061 | &dev_attr_hidden.attr, |
1c9ce527 | 1062 | &dev_attr_ro.attr, |
edfaa7c3 | 1063 | &dev_attr_size.attr, |
c72758f3 | 1064 | &dev_attr_alignment_offset.attr, |
86b37281 | 1065 | &dev_attr_discard_alignment.attr, |
edfaa7c3 KS |
1066 | &dev_attr_capability.attr, |
1067 | &dev_attr_stat.attr, | |
316d315b | 1068 | &dev_attr_inflight.attr, |
99e6608c | 1069 | &dev_attr_badblocks.attr, |
2bc8cda5 CH |
1070 | &dev_attr_events.attr, |
1071 | &dev_attr_events_async.attr, | |
1072 | &dev_attr_events_poll_msecs.attr, | |
13927b31 | 1073 | &dev_attr_diskseq.attr, |
edfaa7c3 KS |
1074 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
1075 | &dev_attr_fail.attr, | |
581d4e28 JA |
1076 | #endif |
1077 | #ifdef CONFIG_FAIL_IO_TIMEOUT | |
1078 | &dev_attr_fail_timeout.attr, | |
edfaa7c3 KS |
1079 | #endif |
1080 | NULL | |
1081 | }; | |
1082 | ||
9438b3e0 DW |
1083 | static umode_t disk_visible(struct kobject *kobj, struct attribute *a, int n) |
1084 | { | |
1085 | struct device *dev = container_of(kobj, typeof(*dev), kobj); | |
1086 | struct gendisk *disk = dev_to_disk(dev); | |
1087 | ||
1088 | if (a == &dev_attr_badblocks.attr && !disk->bb) | |
1089 | return 0; | |
1090 | return a->mode; | |
1091 | } | |
1092 | ||
edfaa7c3 KS |
1093 | static struct attribute_group disk_attr_group = { |
1094 | .attrs = disk_attrs, | |
9438b3e0 | 1095 | .is_visible = disk_visible, |
edfaa7c3 KS |
1096 | }; |
1097 | ||
a4dbd674 | 1098 | static const struct attribute_group *disk_attr_groups[] = { |
edfaa7c3 KS |
1099 | &disk_attr_group, |
1100 | NULL | |
1da177e4 LT |
1101 | }; |
1102 | ||
28ce942f ML |
1103 | static void disk_release_mq(struct request_queue *q) |
1104 | { | |
1105 | blk_mq_cancel_work_sync(q); | |
1106 | ||
1107 | /* | |
1108 | * There can't be any non non-passthrough bios in flight here, but | |
1109 | * requests stay around longer, including passthrough ones so we | |
1110 | * still need to freeze the queue here. | |
1111 | */ | |
1112 | blk_mq_freeze_queue(q); | |
1113 | ||
1114 | /* | |
1115 | * Since the I/O scheduler exit code may access cgroup information, | |
1116 | * perform I/O scheduler exit before disassociating from the block | |
1117 | * cgroup controller. | |
1118 | */ | |
1119 | if (q->elevator) { | |
28ce942f | 1120 | mutex_lock(&q->sysfs_lock); |
28ce942f ML |
1121 | elevator_exit(q); |
1122 | mutex_unlock(&q->sysfs_lock); | |
1123 | } | |
5ca7546f | 1124 | rq_qos_exit(q); |
28ce942f ML |
1125 | __blk_mq_unfreeze_queue(q, true); |
1126 | } | |
1127 | ||
b5bd357c LC |
1128 | /** |
1129 | * disk_release - releases all allocated resources of the gendisk | |
1130 | * @dev: the device representing this disk | |
1131 | * | |
1132 | * This function releases all allocated resources of the gendisk. | |
1133 | * | |
b5bd357c LC |
1134 | * Drivers which used __device_add_disk() have a gendisk with a request_queue |
1135 | * assigned. Since the request_queue sits on top of the gendisk for these | |
1136 | * drivers we also call blk_put_queue() for them, and we expect the | |
1137 | * request_queue refcount to reach 0 at this point, and so the request_queue | |
1138 | * will also be freed prior to the disk. | |
e8c7d14a LC |
1139 | * |
1140 | * Context: can sleep | |
b5bd357c | 1141 | */ |
edfaa7c3 | 1142 | static void disk_release(struct device *dev) |
1da177e4 | 1143 | { |
edfaa7c3 KS |
1144 | struct gendisk *disk = dev_to_disk(dev); |
1145 | ||
e8c7d14a | 1146 | might_sleep(); |
a2041761 | 1147 | WARN_ON_ONCE(disk_live(disk)); |
e8c7d14a | 1148 | |
28ce942f ML |
1149 | if (queue_is_mq(disk->queue)) |
1150 | disk_release_mq(disk->queue); | |
2a19b28f | 1151 | |
1059699f ML |
1152 | blkcg_exit_queue(disk->queue); |
1153 | ||
77ea887e | 1154 | disk_release_events(disk); |
1da177e4 | 1155 | kfree(disk->random); |
a33df75c | 1156 | xa_destroy(&disk->part_tbl); |
1059699f | 1157 | |
d152c682 | 1158 | disk->queue->disk = NULL; |
61a35cfc | 1159 | blk_put_queue(disk->queue); |
76792055 CH |
1160 | |
1161 | if (test_bit(GD_ADDED, &disk->state) && disk->fops->free_disk) | |
1162 | disk->fops->free_disk(disk); | |
1163 | ||
2f4731dc | 1164 | iput(disk->part0->bd_inode); /* frees the disk */ |
1da177e4 | 1165 | } |
87eb7107 MC |
1166 | |
1167 | static int block_uevent(struct device *dev, struct kobj_uevent_env *env) | |
1168 | { | |
1169 | struct gendisk *disk = dev_to_disk(dev); | |
1170 | ||
1171 | return add_uevent_var(env, "DISKSEQ=%llu", disk->diskseq); | |
1172 | } | |
1173 | ||
edfaa7c3 KS |
1174 | struct class block_class = { |
1175 | .name = "block", | |
87eb7107 | 1176 | .dev_uevent = block_uevent, |
1da177e4 LT |
1177 | }; |
1178 | ||
3c2670e6 | 1179 | static char *block_devnode(struct device *dev, umode_t *mode, |
4e4098a3 | 1180 | kuid_t *uid, kgid_t *gid) |
b03f38b6 KS |
1181 | { |
1182 | struct gendisk *disk = dev_to_disk(dev); | |
1183 | ||
348e114b CH |
1184 | if (disk->fops->devnode) |
1185 | return disk->fops->devnode(disk, mode); | |
b03f38b6 KS |
1186 | return NULL; |
1187 | } | |
1188 | ||
ef45fe47 | 1189 | const struct device_type disk_type = { |
edfaa7c3 KS |
1190 | .name = "disk", |
1191 | .groups = disk_attr_groups, | |
1192 | .release = disk_release, | |
e454cea2 | 1193 | .devnode = block_devnode, |
1da177e4 LT |
1194 | }; |
1195 | ||
a6e2ba88 | 1196 | #ifdef CONFIG_PROC_FS |
cf771cb5 TH |
1197 | /* |
1198 | * aggregate disk stat collector. Uses the same stats that the sysfs | |
1199 | * entries do, above, but makes them available through one seq_file. | |
1200 | * | |
1201 | * The output looks suspiciously like /proc/partitions with a bunch of | |
1202 | * extra fields. | |
1203 | */ | |
1204 | static int diskstats_show(struct seq_file *seqf, void *v) | |
1da177e4 LT |
1205 | { |
1206 | struct gendisk *gp = v; | |
ad1eaa53 | 1207 | struct block_device *hd; |
e016b782 | 1208 | unsigned int inflight; |
ea18e0f0 | 1209 | struct disk_stats stat; |
7fae67cc | 1210 | unsigned long idx; |
1da177e4 LT |
1211 | |
1212 | /* | |
ed9e1982 | 1213 | if (&disk_to_dev(gp)->kobj.entry == block_class.devices.next) |
cf771cb5 | 1214 | seq_puts(seqf, "major minor name" |
1da177e4 LT |
1215 | " rio rmerge rsect ruse wio wmerge " |
1216 | "wsect wuse running use aveq" | |
1217 | "\n\n"); | |
1218 | */ | |
9f5e4865 | 1219 | |
7fae67cc CH |
1220 | rcu_read_lock(); |
1221 | xa_for_each(&gp->part_tbl, idx, hd) { | |
1222 | if (bdev_is_partition(hd) && !bdev_nr_sectors(hd)) | |
1223 | continue; | |
b2f609e1 | 1224 | if (queue_is_mq(gp->queue)) |
ad1eaa53 | 1225 | inflight = blk_mq_in_flight(gp->queue, hd); |
b2f609e1 | 1226 | else |
ad1eaa53 | 1227 | inflight = part_in_flight(hd); |
ea18e0f0 | 1228 | |
86d73312 ZW |
1229 | if (inflight) { |
1230 | part_stat_lock(); | |
1231 | update_io_ticks(hd, jiffies, true); | |
1232 | part_stat_unlock(); | |
1233 | } | |
1234 | part_stat_read_all(hd, &stat); | |
26e2d7a3 | 1235 | seq_printf(seqf, "%4d %7d %pg " |
bdca3c87 MC |
1236 | "%lu %lu %lu %u " |
1237 | "%lu %lu %lu %u " | |
1238 | "%u %u %u " | |
b6866318 KK |
1239 | "%lu %lu %lu %u " |
1240 | "%lu %u" | |
1241 | "\n", | |
26e2d7a3 | 1242 | MAJOR(hd->bd_dev), MINOR(hd->bd_dev), hd, |
ea18e0f0 KK |
1243 | stat.ios[STAT_READ], |
1244 | stat.merges[STAT_READ], | |
1245 | stat.sectors[STAT_READ], | |
1246 | (unsigned int)div_u64(stat.nsecs[STAT_READ], | |
1247 | NSEC_PER_MSEC), | |
1248 | stat.ios[STAT_WRITE], | |
1249 | stat.merges[STAT_WRITE], | |
1250 | stat.sectors[STAT_WRITE], | |
1251 | (unsigned int)div_u64(stat.nsecs[STAT_WRITE], | |
1252 | NSEC_PER_MSEC), | |
e016b782 | 1253 | inflight, |
ea18e0f0 | 1254 | jiffies_to_msecs(stat.io_ticks), |
8cd5b8fc KK |
1255 | (unsigned int)div_u64(stat.nsecs[STAT_READ] + |
1256 | stat.nsecs[STAT_WRITE] + | |
1257 | stat.nsecs[STAT_DISCARD] + | |
1258 | stat.nsecs[STAT_FLUSH], | |
1259 | NSEC_PER_MSEC), | |
ea18e0f0 KK |
1260 | stat.ios[STAT_DISCARD], |
1261 | stat.merges[STAT_DISCARD], | |
1262 | stat.sectors[STAT_DISCARD], | |
1263 | (unsigned int)div_u64(stat.nsecs[STAT_DISCARD], | |
1264 | NSEC_PER_MSEC), | |
1265 | stat.ios[STAT_FLUSH], | |
1266 | (unsigned int)div_u64(stat.nsecs[STAT_FLUSH], | |
1267 | NSEC_PER_MSEC) | |
28f39d55 | 1268 | ); |
1da177e4 | 1269 | } |
7fae67cc | 1270 | rcu_read_unlock(); |
9f5e4865 | 1271 | |
1da177e4 LT |
1272 | return 0; |
1273 | } | |
1274 | ||
31d85ab2 | 1275 | static const struct seq_operations diskstats_op = { |
def4e38d TH |
1276 | .start = disk_seqf_start, |
1277 | .next = disk_seqf_next, | |
1278 | .stop = disk_seqf_stop, | |
1da177e4 LT |
1279 | .show = diskstats_show |
1280 | }; | |
f500975a AD |
1281 | |
1282 | static int __init proc_genhd_init(void) | |
1283 | { | |
fddda2b7 CH |
1284 | proc_create_seq("diskstats", 0, NULL, &diskstats_op); |
1285 | proc_create_seq("partitions", 0, NULL, &partitions_op); | |
f500975a AD |
1286 | return 0; |
1287 | } | |
1288 | module_init(proc_genhd_init); | |
a6e2ba88 | 1289 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 1290 | |
c97d93c3 CH |
1291 | dev_t part_devt(struct gendisk *disk, u8 partno) |
1292 | { | |
0e0ccdec | 1293 | struct block_device *part; |
c97d93c3 CH |
1294 | dev_t devt = 0; |
1295 | ||
0e0ccdec CH |
1296 | rcu_read_lock(); |
1297 | part = xa_load(&disk->part_tbl, partno); | |
1298 | if (part) | |
c97d93c3 | 1299 | devt = part->bd_dev; |
0e0ccdec | 1300 | rcu_read_unlock(); |
c97d93c3 CH |
1301 | |
1302 | return devt; | |
1303 | } | |
1304 | ||
cf771cb5 | 1305 | dev_t blk_lookup_devt(const char *name, int partno) |
a142be85 | 1306 | { |
def4e38d TH |
1307 | dev_t devt = MKDEV(0, 0); |
1308 | struct class_dev_iter iter; | |
1309 | struct device *dev; | |
a142be85 | 1310 | |
def4e38d TH |
1311 | class_dev_iter_init(&iter, &block_class, NULL, &disk_type); |
1312 | while ((dev = class_dev_iter_next(&iter))) { | |
a142be85 | 1313 | struct gendisk *disk = dev_to_disk(dev); |
a142be85 | 1314 | |
3ada8b7e | 1315 | if (strcmp(dev_name(dev), name)) |
f331c029 | 1316 | continue; |
f331c029 | 1317 | |
41b8c853 NB |
1318 | if (partno < disk->minors) { |
1319 | /* We need to return the right devno, even | |
1320 | * if the partition doesn't exist yet. | |
1321 | */ | |
1322 | devt = MKDEV(MAJOR(dev->devt), | |
1323 | MINOR(dev->devt) + partno); | |
c97d93c3 CH |
1324 | } else { |
1325 | devt = part_devt(disk, partno); | |
1326 | if (devt) | |
1327 | break; | |
def4e38d | 1328 | } |
5c0ef6d0 | 1329 | } |
def4e38d | 1330 | class_dev_iter_exit(&iter); |
edfaa7c3 KS |
1331 | return devt; |
1332 | } | |
edfaa7c3 | 1333 | |
4a1fa41d CH |
1334 | struct gendisk *__alloc_disk_node(struct request_queue *q, int node_id, |
1335 | struct lock_class_key *lkclass) | |
1946089a CL |
1336 | { |
1337 | struct gendisk *disk; | |
1338 | ||
61a35cfc CH |
1339 | if (!blk_get_queue(q)) |
1340 | return NULL; | |
1341 | ||
c1b511eb | 1342 | disk = kzalloc_node(sizeof(struct gendisk), GFP_KERNEL, node_id); |
f93af2a4 | 1343 | if (!disk) |
61a35cfc | 1344 | goto out_put_queue; |
6c23a968 | 1345 | |
edb0872f CH |
1346 | disk->bdi = bdi_alloc(node_id); |
1347 | if (!disk->bdi) | |
1348 | goto out_free_disk; | |
1349 | ||
17220ca5 PB |
1350 | /* bdev_alloc() might need the queue, set before the first call */ |
1351 | disk->queue = q; | |
1352 | ||
cb8432d6 CH |
1353 | disk->part0 = bdev_alloc(disk, 0); |
1354 | if (!disk->part0) | |
edb0872f | 1355 | goto out_free_bdi; |
22ae8ce8 | 1356 | |
f93af2a4 | 1357 | disk->node_id = node_id; |
a8698707 | 1358 | mutex_init(&disk->open_mutex); |
a33df75c CH |
1359 | xa_init(&disk->part_tbl); |
1360 | if (xa_insert(&disk->part_tbl, 0, disk->part0, GFP_KERNEL)) | |
1361 | goto out_destroy_part_tbl; | |
f93af2a4 | 1362 | |
1059699f ML |
1363 | if (blkcg_init_queue(q)) |
1364 | goto out_erase_part0; | |
1365 | ||
f93af2a4 CH |
1366 | rand_initialize_disk(disk); |
1367 | disk_to_dev(disk)->class = &block_class; | |
1368 | disk_to_dev(disk)->type = &disk_type; | |
1369 | device_initialize(disk_to_dev(disk)); | |
cf179948 | 1370 | inc_diskseq(disk); |
d152c682 | 1371 | q->disk = disk; |
4dcc4874 | 1372 | lockdep_init_map(&disk->lockdep_map, "(bio completion)", lkclass, 0); |
0dbcfe24 CH |
1373 | #ifdef CONFIG_BLOCK_HOLDER_DEPRECATED |
1374 | INIT_LIST_HEAD(&disk->slave_bdevs); | |
1375 | #endif | |
1da177e4 | 1376 | return disk; |
f93af2a4 | 1377 | |
1059699f ML |
1378 | out_erase_part0: |
1379 | xa_erase(&disk->part_tbl, 0); | |
a33df75c CH |
1380 | out_destroy_part_tbl: |
1381 | xa_destroy(&disk->part_tbl); | |
06cc978d | 1382 | disk->part0->bd_disk = NULL; |
2f4731dc | 1383 | iput(disk->part0->bd_inode); |
edb0872f CH |
1384 | out_free_bdi: |
1385 | bdi_put(disk->bdi); | |
f93af2a4 CH |
1386 | out_free_disk: |
1387 | kfree(disk); | |
61a35cfc CH |
1388 | out_put_queue: |
1389 | blk_put_queue(q); | |
f93af2a4 | 1390 | return NULL; |
1da177e4 | 1391 | } |
e319e1fb | 1392 | EXPORT_SYMBOL(__alloc_disk_node); |
1da177e4 | 1393 | |
4dcc4874 | 1394 | struct gendisk *__blk_alloc_disk(int node, struct lock_class_key *lkclass) |
f525464a CH |
1395 | { |
1396 | struct request_queue *q; | |
1397 | struct gendisk *disk; | |
1398 | ||
704b914f | 1399 | q = blk_alloc_queue(node, false); |
f525464a CH |
1400 | if (!q) |
1401 | return NULL; | |
1402 | ||
4a1fa41d | 1403 | disk = __alloc_disk_node(q, node, lkclass); |
f525464a CH |
1404 | if (!disk) { |
1405 | blk_cleanup_queue(q); | |
1406 | return NULL; | |
1407 | } | |
f525464a CH |
1408 | return disk; |
1409 | } | |
1410 | EXPORT_SYMBOL(__blk_alloc_disk); | |
1411 | ||
b5bd357c LC |
1412 | /** |
1413 | * put_disk - decrements the gendisk refcount | |
0d20dcc2 | 1414 | * @disk: the struct gendisk to decrement the refcount for |
b5bd357c LC |
1415 | * |
1416 | * This decrements the refcount for the struct gendisk. When this reaches 0 | |
1417 | * we'll have disk_release() called. | |
e8c7d14a LC |
1418 | * |
1419 | * Context: Any context, but the last reference must not be dropped from | |
1420 | * atomic context. | |
b5bd357c | 1421 | */ |
1da177e4 LT |
1422 | void put_disk(struct gendisk *disk) |
1423 | { | |
1424 | if (disk) | |
efdc41c8 | 1425 | put_device(disk_to_dev(disk)); |
1da177e4 | 1426 | } |
1da177e4 LT |
1427 | EXPORT_SYMBOL(put_disk); |
1428 | ||
f525464a CH |
1429 | /** |
1430 | * blk_cleanup_disk - shutdown a gendisk allocated by blk_alloc_disk | |
1431 | * @disk: gendisk to shutdown | |
1432 | * | |
1433 | * Mark the queue hanging off @disk DYING, drain all pending requests, then mark | |
1434 | * the queue DEAD, destroy and put it and the gendisk structure. | |
1435 | * | |
1436 | * Context: can sleep | |
1437 | */ | |
1438 | void blk_cleanup_disk(struct gendisk *disk) | |
1439 | { | |
1440 | blk_cleanup_queue(disk->queue); | |
1441 | put_disk(disk); | |
1442 | } | |
1443 | EXPORT_SYMBOL(blk_cleanup_disk); | |
1444 | ||
e3264a4d HR |
1445 | static void set_disk_ro_uevent(struct gendisk *gd, int ro) |
1446 | { | |
1447 | char event[] = "DISK_RO=1"; | |
1448 | char *envp[] = { event, NULL }; | |
1449 | ||
1450 | if (!ro) | |
1451 | event[8] = '0'; | |
1452 | kobject_uevent_env(&disk_to_dev(gd)->kobj, KOBJ_CHANGE, envp); | |
1453 | } | |
1454 | ||
52f019d4 CH |
1455 | /** |
1456 | * set_disk_ro - set a gendisk read-only | |
1457 | * @disk: gendisk to operate on | |
7f31bee3 | 1458 | * @read_only: %true to set the disk read-only, %false set the disk read/write |
52f019d4 CH |
1459 | * |
1460 | * This function is used to indicate whether a given disk device should have its | |
1461 | * read-only flag set. set_disk_ro() is typically used by device drivers to | |
1462 | * indicate whether the underlying physical device is write-protected. | |
1463 | */ | |
1464 | void set_disk_ro(struct gendisk *disk, bool read_only) | |
1da177e4 | 1465 | { |
52f019d4 CH |
1466 | if (read_only) { |
1467 | if (test_and_set_bit(GD_READ_ONLY, &disk->state)) | |
1468 | return; | |
1469 | } else { | |
1470 | if (!test_and_clear_bit(GD_READ_ONLY, &disk->state)) | |
1471 | return; | |
e3264a4d | 1472 | } |
52f019d4 | 1473 | set_disk_ro_uevent(disk, read_only); |
1da177e4 | 1474 | } |
1da177e4 LT |
1475 | EXPORT_SYMBOL(set_disk_ro); |
1476 | ||
cf179948 MC |
1477 | void inc_diskseq(struct gendisk *disk) |
1478 | { | |
1479 | disk->diskseq = atomic64_inc_return(&diskseq); | |
1480 | } |