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Commit | Line | Data |
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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
3bf2bd20 SL |
2 | /* |
3 | * Add configfs and memory store: Kyungchan Koh <kkc6196@fb.com> and | |
4 | * Shaohua Li <shli@fb.com> | |
5 | */ | |
f2298c04 | 6 | #include <linux/module.h> |
fc1bc354 | 7 | |
f2298c04 JA |
8 | #include <linux/moduleparam.h> |
9 | #include <linux/sched.h> | |
10 | #include <linux/fs.h> | |
f2298c04 | 11 | #include <linux/init.h> |
6dad38d3 | 12 | #include "null_blk.h" |
f2298c04 | 13 | |
5bcd0e0c SL |
14 | #define PAGE_SECTORS_SHIFT (PAGE_SHIFT - SECTOR_SHIFT) |
15 | #define PAGE_SECTORS (1 << PAGE_SECTORS_SHIFT) | |
5bcd0e0c SL |
16 | #define SECTOR_MASK (PAGE_SECTORS - 1) |
17 | ||
18 | #define FREE_BATCH 16 | |
19 | ||
eff2c4f1 SL |
20 | #define TICKS_PER_SEC 50ULL |
21 | #define TIMER_INTERVAL (NSEC_PER_SEC / TICKS_PER_SEC) | |
22 | ||
33f782c4 | 23 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION |
93b57046 | 24 | static DECLARE_FAULT_ATTR(null_timeout_attr); |
24941b90 | 25 | static DECLARE_FAULT_ATTR(null_requeue_attr); |
596444e7 | 26 | static DECLARE_FAULT_ATTR(null_init_hctx_attr); |
33f782c4 | 27 | #endif |
93b57046 | 28 | |
eff2c4f1 SL |
29 | static inline u64 mb_per_tick(int mbps) |
30 | { | |
31 | return (1 << 20) / TICKS_PER_SEC * ((u64) mbps); | |
32 | } | |
f2298c04 | 33 | |
3bf2bd20 SL |
34 | /* |
35 | * Status flags for nullb_device. | |
36 | * | |
37 | * CONFIGURED: Device has been configured and turned on. Cannot reconfigure. | |
38 | * UP: Device is currently on and visible in userspace. | |
eff2c4f1 | 39 | * THROTTLED: Device is being throttled. |
deb78b41 | 40 | * CACHE: Device is using a write-back cache. |
3bf2bd20 SL |
41 | */ |
42 | enum nullb_device_flags { | |
43 | NULLB_DEV_FL_CONFIGURED = 0, | |
44 | NULLB_DEV_FL_UP = 1, | |
eff2c4f1 | 45 | NULLB_DEV_FL_THROTTLED = 2, |
deb78b41 | 46 | NULLB_DEV_FL_CACHE = 3, |
3bf2bd20 SL |
47 | }; |
48 | ||
66231ad3 | 49 | #define MAP_SZ ((PAGE_SIZE >> SECTOR_SHIFT) + 2) |
5bcd0e0c SL |
50 | /* |
51 | * nullb_page is a page in memory for nullb devices. | |
52 | * | |
53 | * @page: The page holding the data. | |
54 | * @bitmap: The bitmap represents which sector in the page has data. | |
55 | * Each bit represents one block size. For example, sector 8 | |
56 | * will use the 7th bit | |
deb78b41 SL |
57 | * The highest 2 bits of bitmap are for special purpose. LOCK means the cache |
58 | * page is being flushing to storage. FREE means the cache page is freed and | |
59 | * should be skipped from flushing to storage. Please see | |
60 | * null_make_cache_space | |
5bcd0e0c SL |
61 | */ |
62 | struct nullb_page { | |
63 | struct page *page; | |
66231ad3 | 64 | DECLARE_BITMAP(bitmap, MAP_SZ); |
5bcd0e0c | 65 | }; |
66231ad3 ML |
66 | #define NULLB_PAGE_LOCK (MAP_SZ - 1) |
67 | #define NULLB_PAGE_FREE (MAP_SZ - 2) | |
5bcd0e0c | 68 | |
f2298c04 JA |
69 | static LIST_HEAD(nullb_list); |
70 | static struct mutex lock; | |
71 | static int null_major; | |
94bc02e3 | 72 | static DEFINE_IDA(nullb_indexes); |
82f402fe | 73 | static struct blk_mq_tag_set tag_set; |
f2298c04 | 74 | |
f2298c04 JA |
75 | enum { |
76 | NULL_IRQ_NONE = 0, | |
77 | NULL_IRQ_SOFTIRQ = 1, | |
78 | NULL_IRQ_TIMER = 2, | |
ce2c350b | 79 | }; |
f2298c04 | 80 | |
ce2c350b | 81 | enum { |
f2298c04 JA |
82 | NULL_Q_BIO = 0, |
83 | NULL_Q_RQ = 1, | |
84 | NULL_Q_MQ = 2, | |
85 | }; | |
86 | ||
b3cffc38 | 87 | static int g_no_sched; |
5657a819 | 88 | module_param_named(no_sched, g_no_sched, int, 0444); |
b3cffc38 | 89 | MODULE_PARM_DESC(no_sched, "No io scheduler"); |
90 | ||
2984c868 | 91 | static int g_submit_queues = 1; |
5657a819 | 92 | module_param_named(submit_queues, g_submit_queues, int, 0444); |
f2298c04 JA |
93 | MODULE_PARM_DESC(submit_queues, "Number of submission queues"); |
94 | ||
2984c868 | 95 | static int g_home_node = NUMA_NO_NODE; |
5657a819 | 96 | module_param_named(home_node, g_home_node, int, 0444); |
f2298c04 JA |
97 | MODULE_PARM_DESC(home_node, "Home node for the device"); |
98 | ||
33f782c4 | 99 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION |
290df92a DZ |
100 | /* |
101 | * For more details about fault injection, please refer to | |
102 | * Documentation/fault-injection/fault-injection.rst. | |
103 | */ | |
93b57046 | 104 | static char g_timeout_str[80]; |
5657a819 | 105 | module_param_string(timeout, g_timeout_str, sizeof(g_timeout_str), 0444); |
290df92a | 106 | MODULE_PARM_DESC(timeout, "Fault injection. timeout=<interval>,<probability>,<space>,<times>"); |
24941b90 JA |
107 | |
108 | static char g_requeue_str[80]; | |
5657a819 | 109 | module_param_string(requeue, g_requeue_str, sizeof(g_requeue_str), 0444); |
290df92a | 110 | MODULE_PARM_DESC(requeue, "Fault injection. requeue=<interval>,<probability>,<space>,<times>"); |
596444e7 BVA |
111 | |
112 | static char g_init_hctx_str[80]; | |
113 | module_param_string(init_hctx, g_init_hctx_str, sizeof(g_init_hctx_str), 0444); | |
290df92a | 114 | MODULE_PARM_DESC(init_hctx, "Fault injection to fail hctx init. init_hctx=<interval>,<probability>,<space>,<times>"); |
33f782c4 | 115 | #endif |
93b57046 | 116 | |
2984c868 | 117 | static int g_queue_mode = NULL_Q_MQ; |
709c8667 MB |
118 | |
119 | static int null_param_store_val(const char *str, int *val, int min, int max) | |
120 | { | |
121 | int ret, new_val; | |
122 | ||
123 | ret = kstrtoint(str, 10, &new_val); | |
124 | if (ret) | |
125 | return -EINVAL; | |
126 | ||
127 | if (new_val < min || new_val > max) | |
128 | return -EINVAL; | |
129 | ||
130 | *val = new_val; | |
131 | return 0; | |
132 | } | |
133 | ||
134 | static int null_set_queue_mode(const char *str, const struct kernel_param *kp) | |
135 | { | |
2984c868 | 136 | return null_param_store_val(str, &g_queue_mode, NULL_Q_BIO, NULL_Q_MQ); |
709c8667 MB |
137 | } |
138 | ||
9c27847d | 139 | static const struct kernel_param_ops null_queue_mode_param_ops = { |
709c8667 MB |
140 | .set = null_set_queue_mode, |
141 | .get = param_get_int, | |
142 | }; | |
143 | ||
5657a819 | 144 | device_param_cb(queue_mode, &null_queue_mode_param_ops, &g_queue_mode, 0444); |
54ae81cd | 145 | MODULE_PARM_DESC(queue_mode, "Block interface to use (0=bio,1=rq,2=multiqueue)"); |
f2298c04 | 146 | |
2984c868 | 147 | static int g_gb = 250; |
5657a819 | 148 | module_param_named(gb, g_gb, int, 0444); |
f2298c04 JA |
149 | MODULE_PARM_DESC(gb, "Size in GB"); |
150 | ||
2984c868 | 151 | static int g_bs = 512; |
5657a819 | 152 | module_param_named(bs, g_bs, int, 0444); |
f2298c04 JA |
153 | MODULE_PARM_DESC(bs, "Block size (in bytes)"); |
154 | ||
f7c4ce89 | 155 | static unsigned int nr_devices = 1; |
701dfc42 | 156 | module_param(nr_devices, uint, 0444); |
f2298c04 JA |
157 | MODULE_PARM_DESC(nr_devices, "Number of devices to register"); |
158 | ||
2984c868 | 159 | static bool g_blocking; |
5657a819 | 160 | module_param_named(blocking, g_blocking, bool, 0444); |
db5bcf87 JA |
161 | MODULE_PARM_DESC(blocking, "Register as a blocking blk-mq driver device"); |
162 | ||
82f402fe | 163 | static bool shared_tags; |
5657a819 | 164 | module_param(shared_tags, bool, 0444); |
82f402fe JA |
165 | MODULE_PARM_DESC(shared_tags, "Share tag set between devices for blk-mq"); |
166 | ||
0905053b JG |
167 | static bool g_shared_tag_bitmap; |
168 | module_param_named(shared_tag_bitmap, g_shared_tag_bitmap, bool, 0444); | |
169 | MODULE_PARM_DESC(shared_tag_bitmap, "Use shared tag bitmap for all submission queues for blk-mq"); | |
170 | ||
2984c868 | 171 | static int g_irqmode = NULL_IRQ_SOFTIRQ; |
709c8667 MB |
172 | |
173 | static int null_set_irqmode(const char *str, const struct kernel_param *kp) | |
174 | { | |
2984c868 | 175 | return null_param_store_val(str, &g_irqmode, NULL_IRQ_NONE, |
709c8667 MB |
176 | NULL_IRQ_TIMER); |
177 | } | |
178 | ||
9c27847d | 179 | static const struct kernel_param_ops null_irqmode_param_ops = { |
709c8667 MB |
180 | .set = null_set_irqmode, |
181 | .get = param_get_int, | |
182 | }; | |
183 | ||
5657a819 | 184 | device_param_cb(irqmode, &null_irqmode_param_ops, &g_irqmode, 0444); |
f2298c04 JA |
185 | MODULE_PARM_DESC(irqmode, "IRQ completion handler. 0-none, 1-softirq, 2-timer"); |
186 | ||
2984c868 | 187 | static unsigned long g_completion_nsec = 10000; |
5657a819 | 188 | module_param_named(completion_nsec, g_completion_nsec, ulong, 0444); |
f2298c04 JA |
189 | MODULE_PARM_DESC(completion_nsec, "Time in ns to complete a request in hardware. Default: 10,000ns"); |
190 | ||
2984c868 | 191 | static int g_hw_queue_depth = 64; |
5657a819 | 192 | module_param_named(hw_queue_depth, g_hw_queue_depth, int, 0444); |
f2298c04 JA |
193 | MODULE_PARM_DESC(hw_queue_depth, "Queue depth for each hardware queue. Default: 64"); |
194 | ||
2984c868 | 195 | static bool g_use_per_node_hctx; |
5657a819 | 196 | module_param_named(use_per_node_hctx, g_use_per_node_hctx, bool, 0444); |
20005244 | 197 | MODULE_PARM_DESC(use_per_node_hctx, "Use per-node allocation for hardware context queues. Default: false"); |
f2298c04 | 198 | |
ca4b2a01 MB |
199 | static bool g_zoned; |
200 | module_param_named(zoned, g_zoned, bool, S_IRUGO); | |
201 | MODULE_PARM_DESC(zoned, "Make device as a host-managed zoned block device. Default: false"); | |
202 | ||
203 | static unsigned long g_zone_size = 256; | |
204 | module_param_named(zone_size, g_zone_size, ulong, S_IRUGO); | |
205 | MODULE_PARM_DESC(zone_size, "Zone size in MB when block device is zoned. Must be power-of-two: Default: 256"); | |
206 | ||
089565fb AR |
207 | static unsigned long g_zone_capacity; |
208 | module_param_named(zone_capacity, g_zone_capacity, ulong, 0444); | |
209 | MODULE_PARM_DESC(zone_capacity, "Zone capacity in MB when block device is zoned. Can be less than or equal to zone size. Default: Zone size"); | |
210 | ||
ea2c18e1 MS |
211 | static unsigned int g_zone_nr_conv; |
212 | module_param_named(zone_nr_conv, g_zone_nr_conv, uint, 0444); | |
213 | MODULE_PARM_DESC(zone_nr_conv, "Number of conventional zones when block device is zoned. Default: 0"); | |
214 | ||
dc4d137e NC |
215 | static unsigned int g_zone_max_open; |
216 | module_param_named(zone_max_open, g_zone_max_open, uint, 0444); | |
217 | MODULE_PARM_DESC(zone_max_open, "Maximum number of open zones when block device is zoned. Default: 0 (no limit)"); | |
218 | ||
219 | static unsigned int g_zone_max_active; | |
220 | module_param_named(zone_max_active, g_zone_max_active, uint, 0444); | |
221 | MODULE_PARM_DESC(zone_max_active, "Maximum number of active zones when block device is zoned. Default: 0 (no limit)"); | |
222 | ||
3bf2bd20 SL |
223 | static struct nullb_device *null_alloc_dev(void); |
224 | static void null_free_dev(struct nullb_device *dev); | |
cedcafad SL |
225 | static void null_del_dev(struct nullb *nullb); |
226 | static int null_add_dev(struct nullb_device *dev); | |
deb78b41 | 227 | static void null_free_device_storage(struct nullb_device *dev, bool is_cache); |
3bf2bd20 SL |
228 | |
229 | static inline struct nullb_device *to_nullb_device(struct config_item *item) | |
230 | { | |
231 | return item ? container_of(item, struct nullb_device, item) : NULL; | |
232 | } | |
233 | ||
234 | static inline ssize_t nullb_device_uint_attr_show(unsigned int val, char *page) | |
235 | { | |
236 | return snprintf(page, PAGE_SIZE, "%u\n", val); | |
237 | } | |
238 | ||
239 | static inline ssize_t nullb_device_ulong_attr_show(unsigned long val, | |
240 | char *page) | |
241 | { | |
242 | return snprintf(page, PAGE_SIZE, "%lu\n", val); | |
243 | } | |
244 | ||
245 | static inline ssize_t nullb_device_bool_attr_show(bool val, char *page) | |
246 | { | |
247 | return snprintf(page, PAGE_SIZE, "%u\n", val); | |
248 | } | |
249 | ||
250 | static ssize_t nullb_device_uint_attr_store(unsigned int *val, | |
251 | const char *page, size_t count) | |
252 | { | |
253 | unsigned int tmp; | |
254 | int result; | |
255 | ||
256 | result = kstrtouint(page, 0, &tmp); | |
45919fbf | 257 | if (result < 0) |
3bf2bd20 SL |
258 | return result; |
259 | ||
260 | *val = tmp; | |
261 | return count; | |
262 | } | |
263 | ||
264 | static ssize_t nullb_device_ulong_attr_store(unsigned long *val, | |
265 | const char *page, size_t count) | |
266 | { | |
267 | int result; | |
268 | unsigned long tmp; | |
269 | ||
270 | result = kstrtoul(page, 0, &tmp); | |
45919fbf | 271 | if (result < 0) |
3bf2bd20 SL |
272 | return result; |
273 | ||
274 | *val = tmp; | |
275 | return count; | |
276 | } | |
277 | ||
278 | static ssize_t nullb_device_bool_attr_store(bool *val, const char *page, | |
279 | size_t count) | |
280 | { | |
281 | bool tmp; | |
282 | int result; | |
283 | ||
284 | result = kstrtobool(page, &tmp); | |
45919fbf | 285 | if (result < 0) |
3bf2bd20 SL |
286 | return result; |
287 | ||
288 | *val = tmp; | |
289 | return count; | |
290 | } | |
291 | ||
292 | /* The following macro should only be used with TYPE = {uint, ulong, bool}. */ | |
ca0a95a6 AM |
293 | #define NULLB_DEVICE_ATTR(NAME, TYPE, APPLY) \ |
294 | static ssize_t \ | |
295 | nullb_device_##NAME##_show(struct config_item *item, char *page) \ | |
296 | { \ | |
297 | return nullb_device_##TYPE##_attr_show( \ | |
298 | to_nullb_device(item)->NAME, page); \ | |
299 | } \ | |
300 | static ssize_t \ | |
301 | nullb_device_##NAME##_store(struct config_item *item, const char *page, \ | |
302 | size_t count) \ | |
303 | { \ | |
304 | int (*apply_fn)(struct nullb_device *dev, TYPE new_value) = APPLY;\ | |
305 | struct nullb_device *dev = to_nullb_device(item); \ | |
b9853b4d | 306 | TYPE new_value = 0; \ |
ca0a95a6 AM |
307 | int ret; \ |
308 | \ | |
309 | ret = nullb_device_##TYPE##_attr_store(&new_value, page, count);\ | |
310 | if (ret < 0) \ | |
311 | return ret; \ | |
312 | if (apply_fn) \ | |
313 | ret = apply_fn(dev, new_value); \ | |
314 | else if (test_bit(NULLB_DEV_FL_CONFIGURED, &dev->flags)) \ | |
315 | ret = -EBUSY; \ | |
316 | if (ret < 0) \ | |
317 | return ret; \ | |
318 | dev->NAME = new_value; \ | |
319 | return count; \ | |
320 | } \ | |
3bf2bd20 SL |
321 | CONFIGFS_ATTR(nullb_device_, NAME); |
322 | ||
45919fbf BVA |
323 | static int nullb_apply_submit_queues(struct nullb_device *dev, |
324 | unsigned int submit_queues) | |
325 | { | |
326 | struct nullb *nullb = dev->nullb; | |
327 | struct blk_mq_tag_set *set; | |
328 | ||
329 | if (!nullb) | |
330 | return 0; | |
331 | ||
78b10be2 BVA |
332 | /* |
333 | * Make sure that null_init_hctx() does not access nullb->queues[] past | |
334 | * the end of that array. | |
335 | */ | |
336 | if (submit_queues > nr_cpu_ids) | |
337 | return -EINVAL; | |
45919fbf BVA |
338 | set = nullb->tag_set; |
339 | blk_mq_update_nr_hw_queues(set, submit_queues); | |
340 | return set->nr_hw_queues == submit_queues ? 0 : -ENOMEM; | |
341 | } | |
342 | ||
343 | NULLB_DEVICE_ATTR(size, ulong, NULL); | |
344 | NULLB_DEVICE_ATTR(completion_nsec, ulong, NULL); | |
345 | NULLB_DEVICE_ATTR(submit_queues, uint, nullb_apply_submit_queues); | |
346 | NULLB_DEVICE_ATTR(home_node, uint, NULL); | |
347 | NULLB_DEVICE_ATTR(queue_mode, uint, NULL); | |
348 | NULLB_DEVICE_ATTR(blocksize, uint, NULL); | |
349 | NULLB_DEVICE_ATTR(irqmode, uint, NULL); | |
350 | NULLB_DEVICE_ATTR(hw_queue_depth, uint, NULL); | |
351 | NULLB_DEVICE_ATTR(index, uint, NULL); | |
352 | NULLB_DEVICE_ATTR(blocking, bool, NULL); | |
353 | NULLB_DEVICE_ATTR(use_per_node_hctx, bool, NULL); | |
354 | NULLB_DEVICE_ATTR(memory_backed, bool, NULL); | |
355 | NULLB_DEVICE_ATTR(discard, bool, NULL); | |
356 | NULLB_DEVICE_ATTR(mbps, uint, NULL); | |
357 | NULLB_DEVICE_ATTR(cache_size, ulong, NULL); | |
358 | NULLB_DEVICE_ATTR(zoned, bool, NULL); | |
359 | NULLB_DEVICE_ATTR(zone_size, ulong, NULL); | |
089565fb | 360 | NULLB_DEVICE_ATTR(zone_capacity, ulong, NULL); |
45919fbf | 361 | NULLB_DEVICE_ATTR(zone_nr_conv, uint, NULL); |
dc4d137e NC |
362 | NULLB_DEVICE_ATTR(zone_max_open, uint, NULL); |
363 | NULLB_DEVICE_ATTR(zone_max_active, uint, NULL); | |
3bf2bd20 | 364 | |
cedcafad SL |
365 | static ssize_t nullb_device_power_show(struct config_item *item, char *page) |
366 | { | |
367 | return nullb_device_bool_attr_show(to_nullb_device(item)->power, page); | |
368 | } | |
369 | ||
370 | static ssize_t nullb_device_power_store(struct config_item *item, | |
371 | const char *page, size_t count) | |
372 | { | |
373 | struct nullb_device *dev = to_nullb_device(item); | |
374 | bool newp = false; | |
375 | ssize_t ret; | |
376 | ||
377 | ret = nullb_device_bool_attr_store(&newp, page, count); | |
378 | if (ret < 0) | |
379 | return ret; | |
380 | ||
381 | if (!dev->power && newp) { | |
382 | if (test_and_set_bit(NULLB_DEV_FL_UP, &dev->flags)) | |
383 | return count; | |
384 | if (null_add_dev(dev)) { | |
385 | clear_bit(NULLB_DEV_FL_UP, &dev->flags); | |
386 | return -ENOMEM; | |
387 | } | |
388 | ||
389 | set_bit(NULLB_DEV_FL_CONFIGURED, &dev->flags); | |
390 | dev->power = newp; | |
b3c30512 | 391 | } else if (dev->power && !newp) { |
7602843f BL |
392 | if (test_and_clear_bit(NULLB_DEV_FL_UP, &dev->flags)) { |
393 | mutex_lock(&lock); | |
394 | dev->power = newp; | |
395 | null_del_dev(dev->nullb); | |
396 | mutex_unlock(&lock); | |
397 | } | |
00a8cdb8 | 398 | clear_bit(NULLB_DEV_FL_CONFIGURED, &dev->flags); |
cedcafad SL |
399 | } |
400 | ||
401 | return count; | |
402 | } | |
403 | ||
404 | CONFIGFS_ATTR(nullb_device_, power); | |
405 | ||
2f54a613 SL |
406 | static ssize_t nullb_device_badblocks_show(struct config_item *item, char *page) |
407 | { | |
408 | struct nullb_device *t_dev = to_nullb_device(item); | |
409 | ||
410 | return badblocks_show(&t_dev->badblocks, page, 0); | |
411 | } | |
412 | ||
413 | static ssize_t nullb_device_badblocks_store(struct config_item *item, | |
414 | const char *page, size_t count) | |
415 | { | |
416 | struct nullb_device *t_dev = to_nullb_device(item); | |
417 | char *orig, *buf, *tmp; | |
418 | u64 start, end; | |
419 | int ret; | |
420 | ||
421 | orig = kstrndup(page, count, GFP_KERNEL); | |
422 | if (!orig) | |
423 | return -ENOMEM; | |
424 | ||
425 | buf = strstrip(orig); | |
426 | ||
427 | ret = -EINVAL; | |
428 | if (buf[0] != '+' && buf[0] != '-') | |
429 | goto out; | |
430 | tmp = strchr(&buf[1], '-'); | |
431 | if (!tmp) | |
432 | goto out; | |
433 | *tmp = '\0'; | |
434 | ret = kstrtoull(buf + 1, 0, &start); | |
435 | if (ret) | |
436 | goto out; | |
437 | ret = kstrtoull(tmp + 1, 0, &end); | |
438 | if (ret) | |
439 | goto out; | |
440 | ret = -EINVAL; | |
441 | if (start > end) | |
442 | goto out; | |
443 | /* enable badblocks */ | |
444 | cmpxchg(&t_dev->badblocks.shift, -1, 0); | |
445 | if (buf[0] == '+') | |
446 | ret = badblocks_set(&t_dev->badblocks, start, | |
447 | end - start + 1, 1); | |
448 | else | |
449 | ret = badblocks_clear(&t_dev->badblocks, start, | |
450 | end - start + 1); | |
451 | if (ret == 0) | |
452 | ret = count; | |
453 | out: | |
454 | kfree(orig); | |
455 | return ret; | |
456 | } | |
457 | CONFIGFS_ATTR(nullb_device_, badblocks); | |
458 | ||
3bf2bd20 SL |
459 | static struct configfs_attribute *nullb_device_attrs[] = { |
460 | &nullb_device_attr_size, | |
461 | &nullb_device_attr_completion_nsec, | |
462 | &nullb_device_attr_submit_queues, | |
463 | &nullb_device_attr_home_node, | |
464 | &nullb_device_attr_queue_mode, | |
465 | &nullb_device_attr_blocksize, | |
466 | &nullb_device_attr_irqmode, | |
467 | &nullb_device_attr_hw_queue_depth, | |
cedcafad | 468 | &nullb_device_attr_index, |
3bf2bd20 SL |
469 | &nullb_device_attr_blocking, |
470 | &nullb_device_attr_use_per_node_hctx, | |
cedcafad | 471 | &nullb_device_attr_power, |
5bcd0e0c | 472 | &nullb_device_attr_memory_backed, |
306eb6b4 | 473 | &nullb_device_attr_discard, |
eff2c4f1 | 474 | &nullb_device_attr_mbps, |
deb78b41 | 475 | &nullb_device_attr_cache_size, |
2f54a613 | 476 | &nullb_device_attr_badblocks, |
ca4b2a01 MB |
477 | &nullb_device_attr_zoned, |
478 | &nullb_device_attr_zone_size, | |
089565fb | 479 | &nullb_device_attr_zone_capacity, |
ea2c18e1 | 480 | &nullb_device_attr_zone_nr_conv, |
dc4d137e NC |
481 | &nullb_device_attr_zone_max_open, |
482 | &nullb_device_attr_zone_max_active, | |
3bf2bd20 SL |
483 | NULL, |
484 | }; | |
485 | ||
486 | static void nullb_device_release(struct config_item *item) | |
487 | { | |
5bcd0e0c SL |
488 | struct nullb_device *dev = to_nullb_device(item); |
489 | ||
deb78b41 | 490 | null_free_device_storage(dev, false); |
5bcd0e0c | 491 | null_free_dev(dev); |
3bf2bd20 SL |
492 | } |
493 | ||
494 | static struct configfs_item_operations nullb_device_ops = { | |
495 | .release = nullb_device_release, | |
496 | }; | |
497 | ||
e1919dff | 498 | static const struct config_item_type nullb_device_type = { |
3bf2bd20 SL |
499 | .ct_item_ops = &nullb_device_ops, |
500 | .ct_attrs = nullb_device_attrs, | |
501 | .ct_owner = THIS_MODULE, | |
502 | }; | |
503 | ||
504 | static struct | |
505 | config_item *nullb_group_make_item(struct config_group *group, const char *name) | |
506 | { | |
507 | struct nullb_device *dev; | |
508 | ||
509 | dev = null_alloc_dev(); | |
510 | if (!dev) | |
511 | return ERR_PTR(-ENOMEM); | |
512 | ||
513 | config_item_init_type_name(&dev->item, name, &nullb_device_type); | |
514 | ||
515 | return &dev->item; | |
516 | } | |
517 | ||
518 | static void | |
519 | nullb_group_drop_item(struct config_group *group, struct config_item *item) | |
520 | { | |
cedcafad SL |
521 | struct nullb_device *dev = to_nullb_device(item); |
522 | ||
523 | if (test_and_clear_bit(NULLB_DEV_FL_UP, &dev->flags)) { | |
524 | mutex_lock(&lock); | |
525 | dev->power = false; | |
526 | null_del_dev(dev->nullb); | |
527 | mutex_unlock(&lock); | |
528 | } | |
529 | ||
3bf2bd20 SL |
530 | config_item_put(item); |
531 | } | |
532 | ||
533 | static ssize_t memb_group_features_show(struct config_item *item, char *page) | |
534 | { | |
089565fb | 535 | return snprintf(page, PAGE_SIZE, |
dc4d137e | 536 | "memory_backed,discard,bandwidth,cache,badblocks,zoned,zone_size,zone_capacity,zone_nr_conv,zone_max_open,zone_max_active\n"); |
3bf2bd20 SL |
537 | } |
538 | ||
539 | CONFIGFS_ATTR_RO(memb_group_, features); | |
540 | ||
541 | static struct configfs_attribute *nullb_group_attrs[] = { | |
542 | &memb_group_attr_features, | |
543 | NULL, | |
544 | }; | |
545 | ||
546 | static struct configfs_group_operations nullb_group_ops = { | |
547 | .make_item = nullb_group_make_item, | |
548 | .drop_item = nullb_group_drop_item, | |
549 | }; | |
550 | ||
e1919dff | 551 | static const struct config_item_type nullb_group_type = { |
3bf2bd20 SL |
552 | .ct_group_ops = &nullb_group_ops, |
553 | .ct_attrs = nullb_group_attrs, | |
554 | .ct_owner = THIS_MODULE, | |
555 | }; | |
556 | ||
557 | static struct configfs_subsystem nullb_subsys = { | |
558 | .su_group = { | |
559 | .cg_item = { | |
560 | .ci_namebuf = "nullb", | |
561 | .ci_type = &nullb_group_type, | |
562 | }, | |
563 | }, | |
564 | }; | |
565 | ||
deb78b41 SL |
566 | static inline int null_cache_active(struct nullb *nullb) |
567 | { | |
568 | return test_bit(NULLB_DEV_FL_CACHE, &nullb->dev->flags); | |
569 | } | |
570 | ||
2984c868 SL |
571 | static struct nullb_device *null_alloc_dev(void) |
572 | { | |
573 | struct nullb_device *dev; | |
574 | ||
575 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
576 | if (!dev) | |
577 | return NULL; | |
5bcd0e0c | 578 | INIT_RADIX_TREE(&dev->data, GFP_ATOMIC); |
deb78b41 | 579 | INIT_RADIX_TREE(&dev->cache, GFP_ATOMIC); |
2f54a613 SL |
580 | if (badblocks_init(&dev->badblocks, 0)) { |
581 | kfree(dev); | |
582 | return NULL; | |
583 | } | |
584 | ||
2984c868 SL |
585 | dev->size = g_gb * 1024; |
586 | dev->completion_nsec = g_completion_nsec; | |
587 | dev->submit_queues = g_submit_queues; | |
588 | dev->home_node = g_home_node; | |
589 | dev->queue_mode = g_queue_mode; | |
590 | dev->blocksize = g_bs; | |
591 | dev->irqmode = g_irqmode; | |
592 | dev->hw_queue_depth = g_hw_queue_depth; | |
2984c868 SL |
593 | dev->blocking = g_blocking; |
594 | dev->use_per_node_hctx = g_use_per_node_hctx; | |
ca4b2a01 MB |
595 | dev->zoned = g_zoned; |
596 | dev->zone_size = g_zone_size; | |
089565fb | 597 | dev->zone_capacity = g_zone_capacity; |
ea2c18e1 | 598 | dev->zone_nr_conv = g_zone_nr_conv; |
dc4d137e NC |
599 | dev->zone_max_open = g_zone_max_open; |
600 | dev->zone_max_active = g_zone_max_active; | |
2984c868 SL |
601 | return dev; |
602 | } | |
603 | ||
604 | static void null_free_dev(struct nullb_device *dev) | |
605 | { | |
1addb798 DD |
606 | if (!dev) |
607 | return; | |
608 | ||
d205bde7 | 609 | null_free_zoned_dev(dev); |
1addb798 | 610 | badblocks_exit(&dev->badblocks); |
2984c868 SL |
611 | kfree(dev); |
612 | } | |
613 | ||
f2298c04 JA |
614 | static void put_tag(struct nullb_queue *nq, unsigned int tag) |
615 | { | |
616 | clear_bit_unlock(tag, nq->tag_map); | |
617 | ||
618 | if (waitqueue_active(&nq->wait)) | |
619 | wake_up(&nq->wait); | |
620 | } | |
621 | ||
622 | static unsigned int get_tag(struct nullb_queue *nq) | |
623 | { | |
624 | unsigned int tag; | |
625 | ||
626 | do { | |
627 | tag = find_first_zero_bit(nq->tag_map, nq->queue_depth); | |
628 | if (tag >= nq->queue_depth) | |
629 | return -1U; | |
630 | } while (test_and_set_bit_lock(tag, nq->tag_map)); | |
631 | ||
632 | return tag; | |
633 | } | |
634 | ||
635 | static void free_cmd(struct nullb_cmd *cmd) | |
636 | { | |
637 | put_tag(cmd->nq, cmd->tag); | |
638 | } | |
639 | ||
3c395a96 PV |
640 | static enum hrtimer_restart null_cmd_timer_expired(struct hrtimer *timer); |
641 | ||
f2298c04 JA |
642 | static struct nullb_cmd *__alloc_cmd(struct nullb_queue *nq) |
643 | { | |
644 | struct nullb_cmd *cmd; | |
645 | unsigned int tag; | |
646 | ||
647 | tag = get_tag(nq); | |
648 | if (tag != -1U) { | |
649 | cmd = &nq->cmds[tag]; | |
650 | cmd->tag = tag; | |
ff770422 | 651 | cmd->error = BLK_STS_OK; |
f2298c04 | 652 | cmd->nq = nq; |
2984c868 | 653 | if (nq->dev->irqmode == NULL_IRQ_TIMER) { |
3c395a96 PV |
654 | hrtimer_init(&cmd->timer, CLOCK_MONOTONIC, |
655 | HRTIMER_MODE_REL); | |
656 | cmd->timer.function = null_cmd_timer_expired; | |
657 | } | |
f2298c04 JA |
658 | return cmd; |
659 | } | |
660 | ||
661 | return NULL; | |
662 | } | |
663 | ||
664 | static struct nullb_cmd *alloc_cmd(struct nullb_queue *nq, int can_wait) | |
665 | { | |
666 | struct nullb_cmd *cmd; | |
667 | DEFINE_WAIT(wait); | |
668 | ||
669 | cmd = __alloc_cmd(nq); | |
670 | if (cmd || !can_wait) | |
671 | return cmd; | |
672 | ||
673 | do { | |
674 | prepare_to_wait(&nq->wait, &wait, TASK_UNINTERRUPTIBLE); | |
675 | cmd = __alloc_cmd(nq); | |
676 | if (cmd) | |
677 | break; | |
678 | ||
679 | io_schedule(); | |
680 | } while (1); | |
681 | ||
682 | finish_wait(&nq->wait, &wait); | |
683 | return cmd; | |
684 | } | |
685 | ||
686 | static void end_cmd(struct nullb_cmd *cmd) | |
687 | { | |
2984c868 | 688 | int queue_mode = cmd->nq->dev->queue_mode; |
cf8ecc5a | 689 | |
ce2c350b CH |
690 | switch (queue_mode) { |
691 | case NULL_Q_MQ: | |
5bcd0e0c | 692 | blk_mq_end_request(cmd->rq, cmd->error); |
ce2c350b | 693 | return; |
ce2c350b | 694 | case NULL_Q_BIO: |
5bcd0e0c | 695 | cmd->bio->bi_status = cmd->error; |
4246a0b6 | 696 | bio_endio(cmd->bio); |
48cc661e | 697 | break; |
ce2c350b | 698 | } |
f2298c04 | 699 | |
48cc661e | 700 | free_cmd(cmd); |
cf8ecc5a AA |
701 | } |
702 | ||
703 | static enum hrtimer_restart null_cmd_timer_expired(struct hrtimer *timer) | |
704 | { | |
705 | end_cmd(container_of(timer, struct nullb_cmd, timer)); | |
f2298c04 JA |
706 | |
707 | return HRTIMER_NORESTART; | |
708 | } | |
709 | ||
710 | static void null_cmd_end_timer(struct nullb_cmd *cmd) | |
711 | { | |
2984c868 | 712 | ktime_t kt = cmd->nq->dev->completion_nsec; |
f2298c04 | 713 | |
3c395a96 | 714 | hrtimer_start(&cmd->timer, kt, HRTIMER_MODE_REL); |
f2298c04 JA |
715 | } |
716 | ||
49f66136 | 717 | static void null_complete_rq(struct request *rq) |
f2298c04 | 718 | { |
49f66136 | 719 | end_cmd(blk_mq_rq_to_pdu(rq)); |
f2298c04 JA |
720 | } |
721 | ||
5bcd0e0c SL |
722 | static struct nullb_page *null_alloc_page(gfp_t gfp_flags) |
723 | { | |
724 | struct nullb_page *t_page; | |
725 | ||
726 | t_page = kmalloc(sizeof(struct nullb_page), gfp_flags); | |
727 | if (!t_page) | |
728 | goto out; | |
729 | ||
730 | t_page->page = alloc_pages(gfp_flags, 0); | |
731 | if (!t_page->page) | |
732 | goto out_freepage; | |
733 | ||
66231ad3 | 734 | memset(t_page->bitmap, 0, sizeof(t_page->bitmap)); |
5bcd0e0c SL |
735 | return t_page; |
736 | out_freepage: | |
737 | kfree(t_page); | |
738 | out: | |
739 | return NULL; | |
740 | } | |
741 | ||
742 | static void null_free_page(struct nullb_page *t_page) | |
743 | { | |
66231ad3 ML |
744 | __set_bit(NULLB_PAGE_FREE, t_page->bitmap); |
745 | if (test_bit(NULLB_PAGE_LOCK, t_page->bitmap)) | |
deb78b41 | 746 | return; |
5bcd0e0c SL |
747 | __free_page(t_page->page); |
748 | kfree(t_page); | |
749 | } | |
750 | ||
66231ad3 ML |
751 | static bool null_page_empty(struct nullb_page *page) |
752 | { | |
753 | int size = MAP_SZ - 2; | |
754 | ||
755 | return find_first_bit(page->bitmap, size) == size; | |
756 | } | |
757 | ||
deb78b41 SL |
758 | static void null_free_sector(struct nullb *nullb, sector_t sector, |
759 | bool is_cache) | |
5bcd0e0c SL |
760 | { |
761 | unsigned int sector_bit; | |
762 | u64 idx; | |
763 | struct nullb_page *t_page, *ret; | |
764 | struct radix_tree_root *root; | |
765 | ||
deb78b41 | 766 | root = is_cache ? &nullb->dev->cache : &nullb->dev->data; |
5bcd0e0c SL |
767 | idx = sector >> PAGE_SECTORS_SHIFT; |
768 | sector_bit = (sector & SECTOR_MASK); | |
769 | ||
770 | t_page = radix_tree_lookup(root, idx); | |
771 | if (t_page) { | |
66231ad3 | 772 | __clear_bit(sector_bit, t_page->bitmap); |
5bcd0e0c | 773 | |
66231ad3 | 774 | if (null_page_empty(t_page)) { |
5bcd0e0c SL |
775 | ret = radix_tree_delete_item(root, idx, t_page); |
776 | WARN_ON(ret != t_page); | |
777 | null_free_page(ret); | |
deb78b41 SL |
778 | if (is_cache) |
779 | nullb->dev->curr_cache -= PAGE_SIZE; | |
5bcd0e0c SL |
780 | } |
781 | } | |
782 | } | |
783 | ||
784 | static struct nullb_page *null_radix_tree_insert(struct nullb *nullb, u64 idx, | |
deb78b41 | 785 | struct nullb_page *t_page, bool is_cache) |
5bcd0e0c SL |
786 | { |
787 | struct radix_tree_root *root; | |
788 | ||
deb78b41 | 789 | root = is_cache ? &nullb->dev->cache : &nullb->dev->data; |
5bcd0e0c SL |
790 | |
791 | if (radix_tree_insert(root, idx, t_page)) { | |
792 | null_free_page(t_page); | |
793 | t_page = radix_tree_lookup(root, idx); | |
794 | WARN_ON(!t_page || t_page->page->index != idx); | |
deb78b41 SL |
795 | } else if (is_cache) |
796 | nullb->dev->curr_cache += PAGE_SIZE; | |
5bcd0e0c SL |
797 | |
798 | return t_page; | |
799 | } | |
800 | ||
deb78b41 | 801 | static void null_free_device_storage(struct nullb_device *dev, bool is_cache) |
5bcd0e0c SL |
802 | { |
803 | unsigned long pos = 0; | |
804 | int nr_pages; | |
805 | struct nullb_page *ret, *t_pages[FREE_BATCH]; | |
806 | struct radix_tree_root *root; | |
807 | ||
deb78b41 | 808 | root = is_cache ? &dev->cache : &dev->data; |
5bcd0e0c SL |
809 | |
810 | do { | |
811 | int i; | |
812 | ||
813 | nr_pages = radix_tree_gang_lookup(root, | |
814 | (void **)t_pages, pos, FREE_BATCH); | |
815 | ||
816 | for (i = 0; i < nr_pages; i++) { | |
817 | pos = t_pages[i]->page->index; | |
818 | ret = radix_tree_delete_item(root, pos, t_pages[i]); | |
819 | WARN_ON(ret != t_pages[i]); | |
820 | null_free_page(ret); | |
821 | } | |
822 | ||
823 | pos++; | |
824 | } while (nr_pages == FREE_BATCH); | |
deb78b41 SL |
825 | |
826 | if (is_cache) | |
827 | dev->curr_cache = 0; | |
5bcd0e0c SL |
828 | } |
829 | ||
deb78b41 SL |
830 | static struct nullb_page *__null_lookup_page(struct nullb *nullb, |
831 | sector_t sector, bool for_write, bool is_cache) | |
5bcd0e0c SL |
832 | { |
833 | unsigned int sector_bit; | |
834 | u64 idx; | |
835 | struct nullb_page *t_page; | |
deb78b41 | 836 | struct radix_tree_root *root; |
5bcd0e0c SL |
837 | |
838 | idx = sector >> PAGE_SECTORS_SHIFT; | |
839 | sector_bit = (sector & SECTOR_MASK); | |
840 | ||
deb78b41 SL |
841 | root = is_cache ? &nullb->dev->cache : &nullb->dev->data; |
842 | t_page = radix_tree_lookup(root, idx); | |
5bcd0e0c SL |
843 | WARN_ON(t_page && t_page->page->index != idx); |
844 | ||
66231ad3 | 845 | if (t_page && (for_write || test_bit(sector_bit, t_page->bitmap))) |
5bcd0e0c SL |
846 | return t_page; |
847 | ||
848 | return NULL; | |
849 | } | |
850 | ||
deb78b41 SL |
851 | static struct nullb_page *null_lookup_page(struct nullb *nullb, |
852 | sector_t sector, bool for_write, bool ignore_cache) | |
853 | { | |
854 | struct nullb_page *page = NULL; | |
855 | ||
856 | if (!ignore_cache) | |
857 | page = __null_lookup_page(nullb, sector, for_write, true); | |
858 | if (page) | |
859 | return page; | |
860 | return __null_lookup_page(nullb, sector, for_write, false); | |
861 | } | |
862 | ||
5bcd0e0c | 863 | static struct nullb_page *null_insert_page(struct nullb *nullb, |
61884de0 JA |
864 | sector_t sector, bool ignore_cache) |
865 | __releases(&nullb->lock) | |
866 | __acquires(&nullb->lock) | |
5bcd0e0c SL |
867 | { |
868 | u64 idx; | |
869 | struct nullb_page *t_page; | |
870 | ||
deb78b41 | 871 | t_page = null_lookup_page(nullb, sector, true, ignore_cache); |
5bcd0e0c SL |
872 | if (t_page) |
873 | return t_page; | |
874 | ||
875 | spin_unlock_irq(&nullb->lock); | |
876 | ||
877 | t_page = null_alloc_page(GFP_NOIO); | |
878 | if (!t_page) | |
879 | goto out_lock; | |
880 | ||
881 | if (radix_tree_preload(GFP_NOIO)) | |
882 | goto out_freepage; | |
883 | ||
884 | spin_lock_irq(&nullb->lock); | |
885 | idx = sector >> PAGE_SECTORS_SHIFT; | |
886 | t_page->page->index = idx; | |
deb78b41 | 887 | t_page = null_radix_tree_insert(nullb, idx, t_page, !ignore_cache); |
5bcd0e0c SL |
888 | radix_tree_preload_end(); |
889 | ||
890 | return t_page; | |
891 | out_freepage: | |
892 | null_free_page(t_page); | |
893 | out_lock: | |
894 | spin_lock_irq(&nullb->lock); | |
deb78b41 SL |
895 | return null_lookup_page(nullb, sector, true, ignore_cache); |
896 | } | |
897 | ||
898 | static int null_flush_cache_page(struct nullb *nullb, struct nullb_page *c_page) | |
899 | { | |
900 | int i; | |
901 | unsigned int offset; | |
902 | u64 idx; | |
903 | struct nullb_page *t_page, *ret; | |
904 | void *dst, *src; | |
905 | ||
906 | idx = c_page->page->index; | |
907 | ||
908 | t_page = null_insert_page(nullb, idx << PAGE_SECTORS_SHIFT, true); | |
909 | ||
66231ad3 ML |
910 | __clear_bit(NULLB_PAGE_LOCK, c_page->bitmap); |
911 | if (test_bit(NULLB_PAGE_FREE, c_page->bitmap)) { | |
deb78b41 | 912 | null_free_page(c_page); |
66231ad3 | 913 | if (t_page && null_page_empty(t_page)) { |
deb78b41 SL |
914 | ret = radix_tree_delete_item(&nullb->dev->data, |
915 | idx, t_page); | |
916 | null_free_page(t_page); | |
917 | } | |
918 | return 0; | |
919 | } | |
920 | ||
921 | if (!t_page) | |
922 | return -ENOMEM; | |
923 | ||
924 | src = kmap_atomic(c_page->page); | |
925 | dst = kmap_atomic(t_page->page); | |
926 | ||
927 | for (i = 0; i < PAGE_SECTORS; | |
928 | i += (nullb->dev->blocksize >> SECTOR_SHIFT)) { | |
66231ad3 | 929 | if (test_bit(i, c_page->bitmap)) { |
deb78b41 SL |
930 | offset = (i << SECTOR_SHIFT); |
931 | memcpy(dst + offset, src + offset, | |
932 | nullb->dev->blocksize); | |
66231ad3 | 933 | __set_bit(i, t_page->bitmap); |
deb78b41 SL |
934 | } |
935 | } | |
936 | ||
937 | kunmap_atomic(dst); | |
938 | kunmap_atomic(src); | |
939 | ||
940 | ret = radix_tree_delete_item(&nullb->dev->cache, idx, c_page); | |
941 | null_free_page(ret); | |
942 | nullb->dev->curr_cache -= PAGE_SIZE; | |
943 | ||
944 | return 0; | |
945 | } | |
946 | ||
947 | static int null_make_cache_space(struct nullb *nullb, unsigned long n) | |
f2298c04 | 948 | { |
deb78b41 SL |
949 | int i, err, nr_pages; |
950 | struct nullb_page *c_pages[FREE_BATCH]; | |
951 | unsigned long flushed = 0, one_round; | |
952 | ||
953 | again: | |
954 | if ((nullb->dev->cache_size * 1024 * 1024) > | |
955 | nullb->dev->curr_cache + n || nullb->dev->curr_cache == 0) | |
956 | return 0; | |
957 | ||
958 | nr_pages = radix_tree_gang_lookup(&nullb->dev->cache, | |
959 | (void **)c_pages, nullb->cache_flush_pos, FREE_BATCH); | |
960 | /* | |
961 | * nullb_flush_cache_page could unlock before using the c_pages. To | |
962 | * avoid race, we don't allow page free | |
963 | */ | |
964 | for (i = 0; i < nr_pages; i++) { | |
965 | nullb->cache_flush_pos = c_pages[i]->page->index; | |
966 | /* | |
967 | * We found the page which is being flushed to disk by other | |
968 | * threads | |
969 | */ | |
66231ad3 | 970 | if (test_bit(NULLB_PAGE_LOCK, c_pages[i]->bitmap)) |
deb78b41 SL |
971 | c_pages[i] = NULL; |
972 | else | |
66231ad3 | 973 | __set_bit(NULLB_PAGE_LOCK, c_pages[i]->bitmap); |
deb78b41 SL |
974 | } |
975 | ||
976 | one_round = 0; | |
977 | for (i = 0; i < nr_pages; i++) { | |
978 | if (c_pages[i] == NULL) | |
979 | continue; | |
980 | err = null_flush_cache_page(nullb, c_pages[i]); | |
981 | if (err) | |
982 | return err; | |
983 | one_round++; | |
984 | } | |
985 | flushed += one_round << PAGE_SHIFT; | |
986 | ||
987 | if (n > flushed) { | |
988 | if (nr_pages == 0) | |
989 | nullb->cache_flush_pos = 0; | |
990 | if (one_round == 0) { | |
991 | /* give other threads a chance */ | |
992 | spin_unlock_irq(&nullb->lock); | |
993 | spin_lock_irq(&nullb->lock); | |
994 | } | |
995 | goto again; | |
996 | } | |
997 | return 0; | |
5bcd0e0c SL |
998 | } |
999 | ||
1000 | static int copy_to_nullb(struct nullb *nullb, struct page *source, | |
deb78b41 | 1001 | unsigned int off, sector_t sector, size_t n, bool is_fua) |
5bcd0e0c SL |
1002 | { |
1003 | size_t temp, count = 0; | |
1004 | unsigned int offset; | |
1005 | struct nullb_page *t_page; | |
1006 | void *dst, *src; | |
1007 | ||
1008 | while (count < n) { | |
1009 | temp = min_t(size_t, nullb->dev->blocksize, n - count); | |
1010 | ||
deb78b41 SL |
1011 | if (null_cache_active(nullb) && !is_fua) |
1012 | null_make_cache_space(nullb, PAGE_SIZE); | |
1013 | ||
5bcd0e0c | 1014 | offset = (sector & SECTOR_MASK) << SECTOR_SHIFT; |
deb78b41 SL |
1015 | t_page = null_insert_page(nullb, sector, |
1016 | !null_cache_active(nullb) || is_fua); | |
5bcd0e0c SL |
1017 | if (!t_page) |
1018 | return -ENOSPC; | |
1019 | ||
1020 | src = kmap_atomic(source); | |
1021 | dst = kmap_atomic(t_page->page); | |
1022 | memcpy(dst + offset, src + off + count, temp); | |
1023 | kunmap_atomic(dst); | |
1024 | kunmap_atomic(src); | |
1025 | ||
66231ad3 | 1026 | __set_bit(sector & SECTOR_MASK, t_page->bitmap); |
5bcd0e0c | 1027 | |
deb78b41 SL |
1028 | if (is_fua) |
1029 | null_free_sector(nullb, sector, true); | |
1030 | ||
5bcd0e0c SL |
1031 | count += temp; |
1032 | sector += temp >> SECTOR_SHIFT; | |
1033 | } | |
1034 | return 0; | |
1035 | } | |
1036 | ||
1037 | static int copy_from_nullb(struct nullb *nullb, struct page *dest, | |
1038 | unsigned int off, sector_t sector, size_t n) | |
1039 | { | |
1040 | size_t temp, count = 0; | |
1041 | unsigned int offset; | |
1042 | struct nullb_page *t_page; | |
1043 | void *dst, *src; | |
1044 | ||
1045 | while (count < n) { | |
1046 | temp = min_t(size_t, nullb->dev->blocksize, n - count); | |
1047 | ||
1048 | offset = (sector & SECTOR_MASK) << SECTOR_SHIFT; | |
deb78b41 SL |
1049 | t_page = null_lookup_page(nullb, sector, false, |
1050 | !null_cache_active(nullb)); | |
5bcd0e0c SL |
1051 | |
1052 | dst = kmap_atomic(dest); | |
1053 | if (!t_page) { | |
1054 | memset(dst + off + count, 0, temp); | |
1055 | goto next; | |
1056 | } | |
1057 | src = kmap_atomic(t_page->page); | |
1058 | memcpy(dst + off + count, src + offset, temp); | |
1059 | kunmap_atomic(src); | |
1060 | next: | |
1061 | kunmap_atomic(dst); | |
1062 | ||
1063 | count += temp; | |
1064 | sector += temp >> SECTOR_SHIFT; | |
1065 | } | |
1066 | return 0; | |
1067 | } | |
1068 | ||
dd85b492 AJ |
1069 | static void nullb_fill_pattern(struct nullb *nullb, struct page *page, |
1070 | unsigned int len, unsigned int off) | |
1071 | { | |
1072 | void *dst; | |
1073 | ||
1074 | dst = kmap_atomic(page); | |
1075 | memset(dst + off, 0xFF, len); | |
1076 | kunmap_atomic(dst); | |
1077 | } | |
1078 | ||
306eb6b4 SL |
1079 | static void null_handle_discard(struct nullb *nullb, sector_t sector, size_t n) |
1080 | { | |
1081 | size_t temp; | |
1082 | ||
1083 | spin_lock_irq(&nullb->lock); | |
1084 | while (n > 0) { | |
1085 | temp = min_t(size_t, n, nullb->dev->blocksize); | |
deb78b41 SL |
1086 | null_free_sector(nullb, sector, false); |
1087 | if (null_cache_active(nullb)) | |
1088 | null_free_sector(nullb, sector, true); | |
306eb6b4 SL |
1089 | sector += temp >> SECTOR_SHIFT; |
1090 | n -= temp; | |
1091 | } | |
1092 | spin_unlock_irq(&nullb->lock); | |
1093 | } | |
1094 | ||
deb78b41 SL |
1095 | static int null_handle_flush(struct nullb *nullb) |
1096 | { | |
1097 | int err; | |
1098 | ||
1099 | if (!null_cache_active(nullb)) | |
1100 | return 0; | |
1101 | ||
1102 | spin_lock_irq(&nullb->lock); | |
1103 | while (true) { | |
1104 | err = null_make_cache_space(nullb, | |
1105 | nullb->dev->cache_size * 1024 * 1024); | |
1106 | if (err || nullb->dev->curr_cache == 0) | |
1107 | break; | |
1108 | } | |
1109 | ||
1110 | WARN_ON(!radix_tree_empty(&nullb->dev->cache)); | |
1111 | spin_unlock_irq(&nullb->lock); | |
1112 | return err; | |
1113 | } | |
1114 | ||
5bcd0e0c | 1115 | static int null_transfer(struct nullb *nullb, struct page *page, |
deb78b41 SL |
1116 | unsigned int len, unsigned int off, bool is_write, sector_t sector, |
1117 | bool is_fua) | |
f2298c04 | 1118 | { |
dd85b492 AJ |
1119 | struct nullb_device *dev = nullb->dev; |
1120 | unsigned int valid_len = len; | |
5bcd0e0c SL |
1121 | int err = 0; |
1122 | ||
1123 | if (!is_write) { | |
dd85b492 AJ |
1124 | if (dev->zoned) |
1125 | valid_len = null_zone_valid_read_len(nullb, | |
1126 | sector, len); | |
1127 | ||
1128 | if (valid_len) { | |
1129 | err = copy_from_nullb(nullb, page, off, | |
1130 | sector, valid_len); | |
1131 | off += valid_len; | |
1132 | len -= valid_len; | |
1133 | } | |
1134 | ||
1135 | if (len) | |
1136 | nullb_fill_pattern(nullb, page, len, off); | |
5bcd0e0c SL |
1137 | flush_dcache_page(page); |
1138 | } else { | |
1139 | flush_dcache_page(page); | |
deb78b41 | 1140 | err = copy_to_nullb(nullb, page, off, sector, len, is_fua); |
5bcd0e0c SL |
1141 | } |
1142 | ||
1143 | return err; | |
1144 | } | |
1145 | ||
1146 | static int null_handle_rq(struct nullb_cmd *cmd) | |
1147 | { | |
1148 | struct request *rq = cmd->rq; | |
1149 | struct nullb *nullb = cmd->nq->dev->nullb; | |
1150 | int err; | |
1151 | unsigned int len; | |
1152 | sector_t sector; | |
1153 | struct req_iterator iter; | |
1154 | struct bio_vec bvec; | |
1155 | ||
1156 | sector = blk_rq_pos(rq); | |
1157 | ||
306eb6b4 SL |
1158 | if (req_op(rq) == REQ_OP_DISCARD) { |
1159 | null_handle_discard(nullb, sector, blk_rq_bytes(rq)); | |
1160 | return 0; | |
1161 | } | |
1162 | ||
5bcd0e0c SL |
1163 | spin_lock_irq(&nullb->lock); |
1164 | rq_for_each_segment(bvec, rq, iter) { | |
1165 | len = bvec.bv_len; | |
1166 | err = null_transfer(nullb, bvec.bv_page, len, bvec.bv_offset, | |
deb78b41 | 1167 | op_is_write(req_op(rq)), sector, |
2d62e6b0 | 1168 | rq->cmd_flags & REQ_FUA); |
5bcd0e0c SL |
1169 | if (err) { |
1170 | spin_unlock_irq(&nullb->lock); | |
1171 | return err; | |
1172 | } | |
1173 | sector += len >> SECTOR_SHIFT; | |
1174 | } | |
1175 | spin_unlock_irq(&nullb->lock); | |
1176 | ||
1177 | return 0; | |
1178 | } | |
1179 | ||
1180 | static int null_handle_bio(struct nullb_cmd *cmd) | |
1181 | { | |
1182 | struct bio *bio = cmd->bio; | |
1183 | struct nullb *nullb = cmd->nq->dev->nullb; | |
1184 | int err; | |
1185 | unsigned int len; | |
1186 | sector_t sector; | |
1187 | struct bio_vec bvec; | |
1188 | struct bvec_iter iter; | |
1189 | ||
1190 | sector = bio->bi_iter.bi_sector; | |
1191 | ||
306eb6b4 SL |
1192 | if (bio_op(bio) == REQ_OP_DISCARD) { |
1193 | null_handle_discard(nullb, sector, | |
1194 | bio_sectors(bio) << SECTOR_SHIFT); | |
1195 | return 0; | |
1196 | } | |
1197 | ||
5bcd0e0c SL |
1198 | spin_lock_irq(&nullb->lock); |
1199 | bio_for_each_segment(bvec, bio, iter) { | |
1200 | len = bvec.bv_len; | |
1201 | err = null_transfer(nullb, bvec.bv_page, len, bvec.bv_offset, | |
deb78b41 | 1202 | op_is_write(bio_op(bio)), sector, |
bf7c7a04 | 1203 | bio->bi_opf & REQ_FUA); |
5bcd0e0c SL |
1204 | if (err) { |
1205 | spin_unlock_irq(&nullb->lock); | |
1206 | return err; | |
1207 | } | |
1208 | sector += len >> SECTOR_SHIFT; | |
1209 | } | |
1210 | spin_unlock_irq(&nullb->lock); | |
1211 | return 0; | |
1212 | } | |
1213 | ||
eff2c4f1 SL |
1214 | static void null_stop_queue(struct nullb *nullb) |
1215 | { | |
1216 | struct request_queue *q = nullb->q; | |
1217 | ||
1218 | if (nullb->dev->queue_mode == NULL_Q_MQ) | |
1219 | blk_mq_stop_hw_queues(q); | |
eff2c4f1 SL |
1220 | } |
1221 | ||
1222 | static void null_restart_queue_async(struct nullb *nullb) | |
1223 | { | |
1224 | struct request_queue *q = nullb->q; | |
eff2c4f1 SL |
1225 | |
1226 | if (nullb->dev->queue_mode == NULL_Q_MQ) | |
1227 | blk_mq_start_stopped_hw_queues(q, true); | |
eff2c4f1 SL |
1228 | } |
1229 | ||
adb84284 CK |
1230 | static inline blk_status_t null_handle_throttled(struct nullb_cmd *cmd) |
1231 | { | |
1232 | struct nullb_device *dev = cmd->nq->dev; | |
1233 | struct nullb *nullb = dev->nullb; | |
1234 | blk_status_t sts = BLK_STS_OK; | |
1235 | struct request *rq = cmd->rq; | |
1236 | ||
1237 | if (!hrtimer_active(&nullb->bw_timer)) | |
1238 | hrtimer_restart(&nullb->bw_timer); | |
1239 | ||
1240 | if (atomic_long_sub_return(blk_rq_bytes(rq), &nullb->cur_bytes) < 0) { | |
1241 | null_stop_queue(nullb); | |
1242 | /* race with timer */ | |
1243 | if (atomic_long_read(&nullb->cur_bytes) > 0) | |
1244 | null_restart_queue_async(nullb); | |
1245 | /* requeue request */ | |
1246 | sts = BLK_STS_DEV_RESOURCE; | |
1247 | } | |
1248 | return sts; | |
1249 | } | |
1250 | ||
8f94d1c1 CK |
1251 | static inline blk_status_t null_handle_badblocks(struct nullb_cmd *cmd, |
1252 | sector_t sector, | |
1253 | sector_t nr_sectors) | |
1254 | { | |
1255 | struct badblocks *bb = &cmd->nq->dev->badblocks; | |
1256 | sector_t first_bad; | |
1257 | int bad_sectors; | |
1258 | ||
1259 | if (badblocks_check(bb, sector, nr_sectors, &first_bad, &bad_sectors)) | |
1260 | return BLK_STS_IOERR; | |
1261 | ||
1262 | return BLK_STS_OK; | |
1263 | } | |
1264 | ||
7ea88e22 CK |
1265 | static inline blk_status_t null_handle_memory_backed(struct nullb_cmd *cmd, |
1266 | enum req_opf op) | |
1267 | { | |
1268 | struct nullb_device *dev = cmd->nq->dev; | |
1269 | int err; | |
1270 | ||
1271 | if (dev->queue_mode == NULL_Q_BIO) | |
1272 | err = null_handle_bio(cmd); | |
1273 | else | |
1274 | err = null_handle_rq(cmd); | |
1275 | ||
1276 | return errno_to_blk_status(err); | |
1277 | } | |
1278 | ||
cecbc9ce BVA |
1279 | static void nullb_zero_read_cmd_buffer(struct nullb_cmd *cmd) |
1280 | { | |
1281 | struct nullb_device *dev = cmd->nq->dev; | |
1282 | struct bio *bio; | |
1283 | ||
1284 | if (dev->memory_backed) | |
1285 | return; | |
1286 | ||
1287 | if (dev->queue_mode == NULL_Q_BIO && bio_op(cmd->bio) == REQ_OP_READ) { | |
1288 | zero_fill_bio(cmd->bio); | |
1289 | } else if (req_op(cmd->rq) == REQ_OP_READ) { | |
1290 | __rq_for_each_bio(bio, cmd->rq) | |
1291 | zero_fill_bio(bio); | |
1292 | } | |
1293 | } | |
1294 | ||
a3d7d674 CK |
1295 | static inline void nullb_complete_cmd(struct nullb_cmd *cmd) |
1296 | { | |
cecbc9ce BVA |
1297 | /* |
1298 | * Since root privileges are required to configure the null_blk | |
1299 | * driver, it is fine that this driver does not initialize the | |
1300 | * data buffers of read commands. Zero-initialize these buffers | |
1301 | * anyway if KMSAN is enabled to prevent that KMSAN complains | |
1302 | * about null_blk not initializing read data buffers. | |
1303 | */ | |
1304 | if (IS_ENABLED(CONFIG_KMSAN)) | |
1305 | nullb_zero_read_cmd_buffer(cmd); | |
1306 | ||
a3d7d674 CK |
1307 | /* Complete IO by inline, softirq or timer */ |
1308 | switch (cmd->nq->dev->irqmode) { | |
1309 | case NULL_IRQ_SOFTIRQ: | |
1310 | switch (cmd->nq->dev->queue_mode) { | |
1311 | case NULL_Q_MQ: | |
15f73f5b CH |
1312 | if (likely(!blk_should_fake_timeout(cmd->rq->q))) |
1313 | blk_mq_complete_request(cmd->rq); | |
a3d7d674 CK |
1314 | break; |
1315 | case NULL_Q_BIO: | |
1316 | /* | |
1317 | * XXX: no proper submitting cpu information available. | |
1318 | */ | |
1319 | end_cmd(cmd); | |
1320 | break; | |
1321 | } | |
1322 | break; | |
1323 | case NULL_IRQ_NONE: | |
1324 | end_cmd(cmd); | |
1325 | break; | |
1326 | case NULL_IRQ_TIMER: | |
1327 | null_cmd_end_timer(cmd); | |
1328 | break; | |
1329 | } | |
1330 | } | |
1331 | ||
9dd44c7e DLM |
1332 | blk_status_t null_process_cmd(struct nullb_cmd *cmd, |
1333 | enum req_opf op, sector_t sector, | |
1334 | unsigned int nr_sectors) | |
1335 | { | |
1336 | struct nullb_device *dev = cmd->nq->dev; | |
1337 | blk_status_t ret; | |
1338 | ||
1339 | if (dev->badblocks.shift != -1) { | |
1340 | ret = null_handle_badblocks(cmd, sector, nr_sectors); | |
1341 | if (ret != BLK_STS_OK) | |
1342 | return ret; | |
1343 | } | |
1344 | ||
1345 | if (dev->memory_backed) | |
1346 | return null_handle_memory_backed(cmd, op); | |
1347 | ||
1348 | return BLK_STS_OK; | |
1349 | } | |
1350 | ||
d4b186ed CK |
1351 | static blk_status_t null_handle_cmd(struct nullb_cmd *cmd, sector_t sector, |
1352 | sector_t nr_sectors, enum req_opf op) | |
5bcd0e0c SL |
1353 | { |
1354 | struct nullb_device *dev = cmd->nq->dev; | |
eff2c4f1 | 1355 | struct nullb *nullb = dev->nullb; |
adb84284 | 1356 | blk_status_t sts; |
5bcd0e0c | 1357 | |
eff2c4f1 | 1358 | if (test_bit(NULLB_DEV_FL_THROTTLED, &dev->flags)) { |
adb84284 CK |
1359 | sts = null_handle_throttled(cmd); |
1360 | if (sts != BLK_STS_OK) | |
1361 | return sts; | |
eff2c4f1 SL |
1362 | } |
1363 | ||
d4b186ed CK |
1364 | if (op == REQ_OP_FLUSH) { |
1365 | cmd->error = errno_to_blk_status(null_handle_flush(nullb)); | |
1366 | goto out; | |
1367 | } | |
d4b186ed | 1368 | |
9dd44c7e DLM |
1369 | if (dev->zoned) |
1370 | cmd->error = null_process_zoned_cmd(cmd, op, | |
1371 | sector, nr_sectors); | |
1372 | else | |
1373 | cmd->error = null_process_cmd(cmd, op, sector, nr_sectors); | |
fceb5d1b | 1374 | |
2f54a613 | 1375 | out: |
a3d7d674 | 1376 | nullb_complete_cmd(cmd); |
5bcd0e0c | 1377 | return BLK_STS_OK; |
f2298c04 JA |
1378 | } |
1379 | ||
eff2c4f1 SL |
1380 | static enum hrtimer_restart nullb_bwtimer_fn(struct hrtimer *timer) |
1381 | { | |
1382 | struct nullb *nullb = container_of(timer, struct nullb, bw_timer); | |
1383 | ktime_t timer_interval = ktime_set(0, TIMER_INTERVAL); | |
1384 | unsigned int mbps = nullb->dev->mbps; | |
1385 | ||
1386 | if (atomic_long_read(&nullb->cur_bytes) == mb_per_tick(mbps)) | |
1387 | return HRTIMER_NORESTART; | |
1388 | ||
1389 | atomic_long_set(&nullb->cur_bytes, mb_per_tick(mbps)); | |
1390 | null_restart_queue_async(nullb); | |
1391 | ||
1392 | hrtimer_forward_now(&nullb->bw_timer, timer_interval); | |
1393 | ||
1394 | return HRTIMER_RESTART; | |
1395 | } | |
1396 | ||
1397 | static void nullb_setup_bwtimer(struct nullb *nullb) | |
1398 | { | |
1399 | ktime_t timer_interval = ktime_set(0, TIMER_INTERVAL); | |
1400 | ||
1401 | hrtimer_init(&nullb->bw_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); | |
1402 | nullb->bw_timer.function = nullb_bwtimer_fn; | |
1403 | atomic_long_set(&nullb->cur_bytes, mb_per_tick(nullb->dev->mbps)); | |
1404 | hrtimer_start(&nullb->bw_timer, timer_interval, HRTIMER_MODE_REL); | |
f2298c04 JA |
1405 | } |
1406 | ||
1407 | static struct nullb_queue *nullb_to_queue(struct nullb *nullb) | |
1408 | { | |
1409 | int index = 0; | |
1410 | ||
1411 | if (nullb->nr_queues != 1) | |
1412 | index = raw_smp_processor_id() / ((nr_cpu_ids + nullb->nr_queues - 1) / nullb->nr_queues); | |
1413 | ||
1414 | return &nullb->queues[index]; | |
1415 | } | |
1416 | ||
c62b37d9 | 1417 | static blk_qc_t null_submit_bio(struct bio *bio) |
f2298c04 | 1418 | { |
d4b186ed CK |
1419 | sector_t sector = bio->bi_iter.bi_sector; |
1420 | sector_t nr_sectors = bio_sectors(bio); | |
6bbae860 | 1421 | struct nullb *nullb = bio->bi_disk->private_data; |
f2298c04 JA |
1422 | struct nullb_queue *nq = nullb_to_queue(nullb); |
1423 | struct nullb_cmd *cmd; | |
1424 | ||
1425 | cmd = alloc_cmd(nq, 1); | |
1426 | cmd->bio = bio; | |
1427 | ||
d4b186ed | 1428 | null_handle_cmd(cmd, sector, nr_sectors, bio_op(bio)); |
dece1635 | 1429 | return BLK_QC_T_NONE; |
f2298c04 JA |
1430 | } |
1431 | ||
93b57046 JA |
1432 | static bool should_timeout_request(struct request *rq) |
1433 | { | |
33f782c4 | 1434 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION |
93b57046 JA |
1435 | if (g_timeout_str[0]) |
1436 | return should_fail(&null_timeout_attr, 1); | |
33f782c4 | 1437 | #endif |
24941b90 JA |
1438 | return false; |
1439 | } | |
93b57046 | 1440 | |
24941b90 JA |
1441 | static bool should_requeue_request(struct request *rq) |
1442 | { | |
1443 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION | |
1444 | if (g_requeue_str[0]) | |
1445 | return should_fail(&null_requeue_attr, 1); | |
1446 | #endif | |
93b57046 JA |
1447 | return false; |
1448 | } | |
1449 | ||
5448aca4 JA |
1450 | static enum blk_eh_timer_return null_timeout_rq(struct request *rq, bool res) |
1451 | { | |
9c7eddf1 | 1452 | pr_info("rq %p timed out\n", rq); |
15f73f5b | 1453 | blk_mq_complete_request(rq); |
0df0bb08 | 1454 | return BLK_EH_DONE; |
5448aca4 JA |
1455 | } |
1456 | ||
fc17b653 | 1457 | static blk_status_t null_queue_rq(struct blk_mq_hw_ctx *hctx, |
74c45052 | 1458 | const struct blk_mq_queue_data *bd) |
f2298c04 | 1459 | { |
74c45052 | 1460 | struct nullb_cmd *cmd = blk_mq_rq_to_pdu(bd->rq); |
2984c868 | 1461 | struct nullb_queue *nq = hctx->driver_data; |
d4b186ed CK |
1462 | sector_t nr_sectors = blk_rq_sectors(bd->rq); |
1463 | sector_t sector = blk_rq_pos(bd->rq); | |
f2298c04 | 1464 | |
db5bcf87 JA |
1465 | might_sleep_if(hctx->flags & BLK_MQ_F_BLOCKING); |
1466 | ||
2984c868 | 1467 | if (nq->dev->irqmode == NULL_IRQ_TIMER) { |
3c395a96 PV |
1468 | hrtimer_init(&cmd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
1469 | cmd->timer.function = null_cmd_timer_expired; | |
1470 | } | |
74c45052 | 1471 | cmd->rq = bd->rq; |
ff770422 | 1472 | cmd->error = BLK_STS_OK; |
2984c868 | 1473 | cmd->nq = nq; |
f2298c04 | 1474 | |
74c45052 | 1475 | blk_mq_start_request(bd->rq); |
e2490073 | 1476 | |
24941b90 JA |
1477 | if (should_requeue_request(bd->rq)) { |
1478 | /* | |
1479 | * Alternate between hitting the core BUSY path, and the | |
1480 | * driver driven requeue path | |
1481 | */ | |
1482 | nq->requeue_selection++; | |
1483 | if (nq->requeue_selection & 1) | |
1484 | return BLK_STS_RESOURCE; | |
1485 | else { | |
1486 | blk_mq_requeue_request(bd->rq, true); | |
1487 | return BLK_STS_OK; | |
1488 | } | |
1489 | } | |
1490 | if (should_timeout_request(bd->rq)) | |
1491 | return BLK_STS_OK; | |
93b57046 | 1492 | |
d4b186ed | 1493 | return null_handle_cmd(cmd, sector, nr_sectors, req_op(bd->rq)); |
f2298c04 JA |
1494 | } |
1495 | ||
de65d2d2 MB |
1496 | static void cleanup_queue(struct nullb_queue *nq) |
1497 | { | |
1498 | kfree(nq->tag_map); | |
1499 | kfree(nq->cmds); | |
1500 | } | |
1501 | ||
1502 | static void cleanup_queues(struct nullb *nullb) | |
1503 | { | |
1504 | int i; | |
1505 | ||
1506 | for (i = 0; i < nullb->nr_queues; i++) | |
1507 | cleanup_queue(&nullb->queues[i]); | |
1508 | ||
1509 | kfree(nullb->queues); | |
1510 | } | |
1511 | ||
78b10be2 BVA |
1512 | static void null_exit_hctx(struct blk_mq_hw_ctx *hctx, unsigned int hctx_idx) |
1513 | { | |
1514 | struct nullb_queue *nq = hctx->driver_data; | |
1515 | struct nullb *nullb = nq->dev->nullb; | |
1516 | ||
1517 | nullb->nr_queues--; | |
1518 | } | |
1519 | ||
1520 | static void null_init_queue(struct nullb *nullb, struct nullb_queue *nq) | |
1521 | { | |
1522 | init_waitqueue_head(&nq->wait); | |
1523 | nq->queue_depth = nullb->queue_depth; | |
1524 | nq->dev = nullb->dev; | |
1525 | } | |
1526 | ||
1527 | static int null_init_hctx(struct blk_mq_hw_ctx *hctx, void *driver_data, | |
1528 | unsigned int hctx_idx) | |
1529 | { | |
1530 | struct nullb *nullb = hctx->queue->queuedata; | |
1531 | struct nullb_queue *nq; | |
1532 | ||
596444e7 BVA |
1533 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION |
1534 | if (g_init_hctx_str[0] && should_fail(&null_init_hctx_attr, 1)) | |
1535 | return -EFAULT; | |
1536 | #endif | |
1537 | ||
78b10be2 BVA |
1538 | nq = &nullb->queues[hctx_idx]; |
1539 | hctx->driver_data = nq; | |
1540 | null_init_queue(nullb, nq); | |
1541 | nullb->nr_queues++; | |
1542 | ||
1543 | return 0; | |
1544 | } | |
1545 | ||
1546 | static const struct blk_mq_ops null_mq_ops = { | |
1547 | .queue_rq = null_queue_rq, | |
1548 | .complete = null_complete_rq, | |
1549 | .timeout = null_timeout_rq, | |
1550 | .init_hctx = null_init_hctx, | |
1551 | .exit_hctx = null_exit_hctx, | |
1552 | }; | |
1553 | ||
9ae2d0aa MB |
1554 | static void null_del_dev(struct nullb *nullb) |
1555 | { | |
9b03b713 BVA |
1556 | struct nullb_device *dev; |
1557 | ||
1558 | if (!nullb) | |
1559 | return; | |
1560 | ||
1561 | dev = nullb->dev; | |
2984c868 | 1562 | |
94bc02e3 SL |
1563 | ida_simple_remove(&nullb_indexes, nullb->index); |
1564 | ||
9ae2d0aa MB |
1565 | list_del_init(&nullb->list); |
1566 | ||
74ede5af | 1567 | del_gendisk(nullb->disk); |
eff2c4f1 SL |
1568 | |
1569 | if (test_bit(NULLB_DEV_FL_THROTTLED, &nullb->dev->flags)) { | |
1570 | hrtimer_cancel(&nullb->bw_timer); | |
1571 | atomic_long_set(&nullb->cur_bytes, LONG_MAX); | |
1572 | null_restart_queue_async(nullb); | |
1573 | } | |
1574 | ||
9ae2d0aa | 1575 | blk_cleanup_queue(nullb->q); |
2984c868 SL |
1576 | if (dev->queue_mode == NULL_Q_MQ && |
1577 | nullb->tag_set == &nullb->__tag_set) | |
82f402fe | 1578 | blk_mq_free_tag_set(nullb->tag_set); |
74ede5af | 1579 | put_disk(nullb->disk); |
9ae2d0aa | 1580 | cleanup_queues(nullb); |
deb78b41 SL |
1581 | if (null_cache_active(nullb)) |
1582 | null_free_device_storage(nullb->dev, true); | |
9ae2d0aa | 1583 | kfree(nullb); |
2984c868 | 1584 | dev->nullb = NULL; |
9ae2d0aa MB |
1585 | } |
1586 | ||
306eb6b4 SL |
1587 | static void null_config_discard(struct nullb *nullb) |
1588 | { | |
1589 | if (nullb->dev->discard == false) | |
1590 | return; | |
1592cd15 CK |
1591 | |
1592 | if (nullb->dev->zoned) { | |
1593 | nullb->dev->discard = false; | |
1594 | pr_info("discard option is ignored in zoned mode\n"); | |
1595 | return; | |
1596 | } | |
1597 | ||
306eb6b4 SL |
1598 | nullb->q->limits.discard_granularity = nullb->dev->blocksize; |
1599 | nullb->q->limits.discard_alignment = nullb->dev->blocksize; | |
1600 | blk_queue_max_discard_sectors(nullb->q, UINT_MAX >> 9); | |
8b904b5b | 1601 | blk_queue_flag_set(QUEUE_FLAG_DISCARD, nullb->q); |
9ae2d0aa MB |
1602 | } |
1603 | ||
c62b37d9 CH |
1604 | static const struct block_device_operations null_bio_ops = { |
1605 | .owner = THIS_MODULE, | |
1606 | .submit_bio = null_submit_bio, | |
1607 | .report_zones = null_report_zones, | |
1608 | }; | |
1609 | ||
1610 | static const struct block_device_operations null_rq_ops = { | |
e3f89564 | 1611 | .owner = THIS_MODULE, |
7fc8fb51 | 1612 | .report_zones = null_report_zones, |
f2298c04 JA |
1613 | }; |
1614 | ||
1615 | static int setup_commands(struct nullb_queue *nq) | |
1616 | { | |
1617 | struct nullb_cmd *cmd; | |
1618 | int i, tag_size; | |
1619 | ||
6396bb22 | 1620 | nq->cmds = kcalloc(nq->queue_depth, sizeof(*cmd), GFP_KERNEL); |
f2298c04 | 1621 | if (!nq->cmds) |
2d263a78 | 1622 | return -ENOMEM; |
f2298c04 JA |
1623 | |
1624 | tag_size = ALIGN(nq->queue_depth, BITS_PER_LONG) / BITS_PER_LONG; | |
6396bb22 | 1625 | nq->tag_map = kcalloc(tag_size, sizeof(unsigned long), GFP_KERNEL); |
f2298c04 JA |
1626 | if (!nq->tag_map) { |
1627 | kfree(nq->cmds); | |
2d263a78 | 1628 | return -ENOMEM; |
f2298c04 JA |
1629 | } |
1630 | ||
1631 | for (i = 0; i < nq->queue_depth; i++) { | |
1632 | cmd = &nq->cmds[i]; | |
f2298c04 JA |
1633 | cmd->tag = -1U; |
1634 | } | |
1635 | ||
1636 | return 0; | |
1637 | } | |
1638 | ||
f2298c04 JA |
1639 | static int setup_queues(struct nullb *nullb) |
1640 | { | |
78b10be2 | 1641 | nullb->queues = kcalloc(nr_cpu_ids, sizeof(struct nullb_queue), |
6396bb22 | 1642 | GFP_KERNEL); |
f2298c04 | 1643 | if (!nullb->queues) |
2d263a78 | 1644 | return -ENOMEM; |
f2298c04 | 1645 | |
2984c868 | 1646 | nullb->queue_depth = nullb->dev->hw_queue_depth; |
f2298c04 | 1647 | |
2d263a78 MB |
1648 | return 0; |
1649 | } | |
1650 | ||
1651 | static int init_driver_queues(struct nullb *nullb) | |
1652 | { | |
1653 | struct nullb_queue *nq; | |
1654 | int i, ret = 0; | |
f2298c04 | 1655 | |
2984c868 | 1656 | for (i = 0; i < nullb->dev->submit_queues; i++) { |
f2298c04 | 1657 | nq = &nullb->queues[i]; |
2d263a78 MB |
1658 | |
1659 | null_init_queue(nullb, nq); | |
1660 | ||
1661 | ret = setup_commands(nq); | |
1662 | if (ret) | |
31f9690e | 1663 | return ret; |
f2298c04 JA |
1664 | nullb->nr_queues++; |
1665 | } | |
2d263a78 | 1666 | return 0; |
f2298c04 JA |
1667 | } |
1668 | ||
9ae2d0aa | 1669 | static int null_gendisk_register(struct nullb *nullb) |
f2298c04 | 1670 | { |
979d5447 | 1671 | sector_t size = ((sector_t)nullb->dev->size * SZ_1M) >> SECTOR_SHIFT; |
f2298c04 | 1672 | struct gendisk *disk; |
9ae2d0aa | 1673 | |
2984c868 | 1674 | disk = nullb->disk = alloc_disk_node(1, nullb->dev->home_node); |
9ae2d0aa MB |
1675 | if (!disk) |
1676 | return -ENOMEM; | |
979d5447 | 1677 | set_capacity(disk, size); |
9ae2d0aa MB |
1678 | |
1679 | disk->flags |= GENHD_FL_EXT_DEVT | GENHD_FL_SUPPRESS_PARTITION_INFO; | |
1680 | disk->major = null_major; | |
1681 | disk->first_minor = nullb->index; | |
c62b37d9 CH |
1682 | if (queue_is_mq(nullb->q)) |
1683 | disk->fops = &null_rq_ops; | |
1684 | else | |
1685 | disk->fops = &null_bio_ops; | |
9ae2d0aa MB |
1686 | disk->private_data = nullb; |
1687 | disk->queue = nullb->q; | |
1688 | strncpy(disk->disk_name, nullb->disk_name, DISK_NAME_LEN); | |
1689 | ||
bf505456 | 1690 | if (nullb->dev->zoned) { |
d205bde7 DLM |
1691 | int ret = null_register_zoned_dev(nullb); |
1692 | ||
1693 | if (ret) | |
1694 | return ret; | |
bf505456 DLM |
1695 | } |
1696 | ||
9ae2d0aa MB |
1697 | add_disk(disk); |
1698 | return 0; | |
1699 | } | |
1700 | ||
2984c868 | 1701 | static int null_init_tag_set(struct nullb *nullb, struct blk_mq_tag_set *set) |
82f402fe JA |
1702 | { |
1703 | set->ops = &null_mq_ops; | |
2984c868 SL |
1704 | set->nr_hw_queues = nullb ? nullb->dev->submit_queues : |
1705 | g_submit_queues; | |
1706 | set->queue_depth = nullb ? nullb->dev->hw_queue_depth : | |
1707 | g_hw_queue_depth; | |
1708 | set->numa_node = nullb ? nullb->dev->home_node : g_home_node; | |
82f402fe JA |
1709 | set->cmd_size = sizeof(struct nullb_cmd); |
1710 | set->flags = BLK_MQ_F_SHOULD_MERGE; | |
b3cffc38 | 1711 | if (g_no_sched) |
1712 | set->flags |= BLK_MQ_F_NO_SCHED; | |
0905053b JG |
1713 | if (g_shared_tag_bitmap) |
1714 | set->flags |= BLK_MQ_F_TAG_HCTX_SHARED; | |
82f402fe JA |
1715 | set->driver_data = NULL; |
1716 | ||
0d06a42f | 1717 | if ((nullb && nullb->dev->blocking) || g_blocking) |
82f402fe JA |
1718 | set->flags |= BLK_MQ_F_BLOCKING; |
1719 | ||
1720 | return blk_mq_alloc_tag_set(set); | |
1721 | } | |
1722 | ||
5c4bd1f4 | 1723 | static int null_validate_conf(struct nullb_device *dev) |
cedcafad SL |
1724 | { |
1725 | dev->blocksize = round_down(dev->blocksize, 512); | |
1726 | dev->blocksize = clamp_t(unsigned int, dev->blocksize, 512, 4096); | |
cedcafad SL |
1727 | |
1728 | if (dev->queue_mode == NULL_Q_MQ && dev->use_per_node_hctx) { | |
1729 | if (dev->submit_queues != nr_online_nodes) | |
1730 | dev->submit_queues = nr_online_nodes; | |
1731 | } else if (dev->submit_queues > nr_cpu_ids) | |
1732 | dev->submit_queues = nr_cpu_ids; | |
1733 | else if (dev->submit_queues == 0) | |
1734 | dev->submit_queues = 1; | |
1735 | ||
1736 | dev->queue_mode = min_t(unsigned int, dev->queue_mode, NULL_Q_MQ); | |
1737 | dev->irqmode = min_t(unsigned int, dev->irqmode, NULL_IRQ_TIMER); | |
5bcd0e0c SL |
1738 | |
1739 | /* Do memory allocation, so set blocking */ | |
1740 | if (dev->memory_backed) | |
1741 | dev->blocking = true; | |
deb78b41 SL |
1742 | else /* cache is meaningless */ |
1743 | dev->cache_size = 0; | |
1744 | dev->cache_size = min_t(unsigned long, ULONG_MAX / 1024 / 1024, | |
1745 | dev->cache_size); | |
eff2c4f1 SL |
1746 | dev->mbps = min_t(unsigned int, 1024 * 40, dev->mbps); |
1747 | /* can not stop a queue */ | |
1748 | if (dev->queue_mode == NULL_Q_BIO) | |
1749 | dev->mbps = 0; | |
5c4bd1f4 DLM |
1750 | |
1751 | if (dev->zoned && | |
1752 | (!dev->zone_size || !is_power_of_2(dev->zone_size))) { | |
1753 | pr_err("zone_size must be power-of-two\n"); | |
1754 | return -EINVAL; | |
1755 | } | |
1756 | ||
1757 | return 0; | |
cedcafad SL |
1758 | } |
1759 | ||
33f782c4 | 1760 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION |
24941b90 JA |
1761 | static bool __null_setup_fault(struct fault_attr *attr, char *str) |
1762 | { | |
1763 | if (!str[0]) | |
93b57046 JA |
1764 | return true; |
1765 | ||
24941b90 | 1766 | if (!setup_fault_attr(attr, str)) |
93b57046 JA |
1767 | return false; |
1768 | ||
24941b90 JA |
1769 | attr->verbose = 0; |
1770 | return true; | |
1771 | } | |
1772 | #endif | |
1773 | ||
1774 | static bool null_setup_fault(void) | |
1775 | { | |
1776 | #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION | |
1777 | if (!__null_setup_fault(&null_timeout_attr, g_timeout_str)) | |
1778 | return false; | |
1779 | if (!__null_setup_fault(&null_requeue_attr, g_requeue_str)) | |
1780 | return false; | |
596444e7 BVA |
1781 | if (!__null_setup_fault(&null_init_hctx_attr, g_init_hctx_str)) |
1782 | return false; | |
33f782c4 | 1783 | #endif |
93b57046 JA |
1784 | return true; |
1785 | } | |
1786 | ||
2984c868 | 1787 | static int null_add_dev(struct nullb_device *dev) |
9ae2d0aa MB |
1788 | { |
1789 | struct nullb *nullb; | |
dc501dc0 | 1790 | int rv; |
f2298c04 | 1791 | |
5c4bd1f4 DLM |
1792 | rv = null_validate_conf(dev); |
1793 | if (rv) | |
1794 | return rv; | |
cedcafad | 1795 | |
2984c868 | 1796 | nullb = kzalloc_node(sizeof(*nullb), GFP_KERNEL, dev->home_node); |
dc501dc0 RE |
1797 | if (!nullb) { |
1798 | rv = -ENOMEM; | |
24d2f903 | 1799 | goto out; |
dc501dc0 | 1800 | } |
2984c868 SL |
1801 | nullb->dev = dev; |
1802 | dev->nullb = nullb; | |
f2298c04 JA |
1803 | |
1804 | spin_lock_init(&nullb->lock); | |
1805 | ||
dc501dc0 RE |
1806 | rv = setup_queues(nullb); |
1807 | if (rv) | |
24d2f903 | 1808 | goto out_free_nullb; |
f2298c04 | 1809 | |
2984c868 | 1810 | if (dev->queue_mode == NULL_Q_MQ) { |
82f402fe JA |
1811 | if (shared_tags) { |
1812 | nullb->tag_set = &tag_set; | |
1813 | rv = 0; | |
1814 | } else { | |
1815 | nullb->tag_set = &nullb->__tag_set; | |
2984c868 | 1816 | rv = null_init_tag_set(nullb, nullb->tag_set); |
82f402fe JA |
1817 | } |
1818 | ||
dc501dc0 | 1819 | if (rv) |
24d2f903 CH |
1820 | goto out_cleanup_queues; |
1821 | ||
93b57046 JA |
1822 | if (!null_setup_fault()) |
1823 | goto out_cleanup_queues; | |
1824 | ||
5448aca4 | 1825 | nullb->tag_set->timeout = 5 * HZ; |
8d96a111 | 1826 | nullb->q = blk_mq_init_queue_data(nullb->tag_set, nullb); |
35b489d3 | 1827 | if (IS_ERR(nullb->q)) { |
dc501dc0 | 1828 | rv = -ENOMEM; |
24d2f903 | 1829 | goto out_cleanup_tags; |
dc501dc0 | 1830 | } |
2984c868 | 1831 | } else if (dev->queue_mode == NULL_Q_BIO) { |
c62b37d9 | 1832 | nullb->q = blk_alloc_queue(dev->home_node); |
dc501dc0 RE |
1833 | if (!nullb->q) { |
1834 | rv = -ENOMEM; | |
24d2f903 | 1835 | goto out_cleanup_queues; |
dc501dc0 | 1836 | } |
31f9690e JK |
1837 | rv = init_driver_queues(nullb); |
1838 | if (rv) | |
1839 | goto out_cleanup_blk_queue; | |
f2298c04 JA |
1840 | } |
1841 | ||
eff2c4f1 SL |
1842 | if (dev->mbps) { |
1843 | set_bit(NULLB_DEV_FL_THROTTLED, &dev->flags); | |
1844 | nullb_setup_bwtimer(nullb); | |
1845 | } | |
1846 | ||
deb78b41 SL |
1847 | if (dev->cache_size > 0) { |
1848 | set_bit(NULLB_DEV_FL_CACHE, &nullb->dev->flags); | |
1849 | blk_queue_write_cache(nullb->q, true, true); | |
deb78b41 SL |
1850 | } |
1851 | ||
ca4b2a01 | 1852 | if (dev->zoned) { |
d205bde7 | 1853 | rv = null_init_zoned_dev(dev, nullb->q); |
ca4b2a01 MB |
1854 | if (rv) |
1855 | goto out_cleanup_blk_queue; | |
ca4b2a01 MB |
1856 | } |
1857 | ||
f2298c04 | 1858 | nullb->q->queuedata = nullb; |
8b904b5b BVA |
1859 | blk_queue_flag_set(QUEUE_FLAG_NONROT, nullb->q); |
1860 | blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, nullb->q); | |
f2298c04 | 1861 | |
f2298c04 | 1862 | mutex_lock(&lock); |
94bc02e3 | 1863 | nullb->index = ida_simple_get(&nullb_indexes, 0, 0, GFP_KERNEL); |
cedcafad | 1864 | dev->index = nullb->index; |
f2298c04 JA |
1865 | mutex_unlock(&lock); |
1866 | ||
2984c868 SL |
1867 | blk_queue_logical_block_size(nullb->q, dev->blocksize); |
1868 | blk_queue_physical_block_size(nullb->q, dev->blocksize); | |
f2298c04 | 1869 | |
306eb6b4 | 1870 | null_config_discard(nullb); |
f2298c04 | 1871 | |
b2b7e001 MB |
1872 | sprintf(nullb->disk_name, "nullb%d", nullb->index); |
1873 | ||
74ede5af | 1874 | rv = null_gendisk_register(nullb); |
9ae2d0aa | 1875 | if (rv) |
ca4b2a01 | 1876 | goto out_cleanup_zone; |
a514379b MB |
1877 | |
1878 | mutex_lock(&lock); | |
1879 | list_add_tail(&nullb->list, &nullb_list); | |
1880 | mutex_unlock(&lock); | |
3681c85d | 1881 | |
f2298c04 | 1882 | return 0; |
ca4b2a01 | 1883 | out_cleanup_zone: |
d205bde7 | 1884 | null_free_zoned_dev(dev); |
24d2f903 CH |
1885 | out_cleanup_blk_queue: |
1886 | blk_cleanup_queue(nullb->q); | |
1887 | out_cleanup_tags: | |
2984c868 | 1888 | if (dev->queue_mode == NULL_Q_MQ && nullb->tag_set == &nullb->__tag_set) |
82f402fe | 1889 | blk_mq_free_tag_set(nullb->tag_set); |
24d2f903 CH |
1890 | out_cleanup_queues: |
1891 | cleanup_queues(nullb); | |
1892 | out_free_nullb: | |
1893 | kfree(nullb); | |
2004bfde | 1894 | dev->nullb = NULL; |
24d2f903 | 1895 | out: |
dc501dc0 | 1896 | return rv; |
f2298c04 JA |
1897 | } |
1898 | ||
1899 | static int __init null_init(void) | |
1900 | { | |
af096e22 | 1901 | int ret = 0; |
f2298c04 | 1902 | unsigned int i; |
af096e22 | 1903 | struct nullb *nullb; |
2984c868 | 1904 | struct nullb_device *dev; |
f2298c04 | 1905 | |
2984c868 | 1906 | if (g_bs > PAGE_SIZE) { |
9c7eddf1 AA |
1907 | pr_warn("invalid block size\n"); |
1908 | pr_warn("defaults block size to %lu\n", PAGE_SIZE); | |
2984c868 | 1909 | g_bs = PAGE_SIZE; |
9967d8ac | 1910 | } |
f2298c04 | 1911 | |
7ff684a6 | 1912 | if (g_home_node != NUMA_NO_NODE && g_home_node >= nr_online_nodes) { |
9c7eddf1 | 1913 | pr_err("invalid home_node value\n"); |
7ff684a6 JP |
1914 | g_home_node = NUMA_NO_NODE; |
1915 | } | |
1916 | ||
e50b1e32 | 1917 | if (g_queue_mode == NULL_Q_RQ) { |
9c7eddf1 | 1918 | pr_err("legacy IO path no longer available\n"); |
e50b1e32 JA |
1919 | return -EINVAL; |
1920 | } | |
2984c868 SL |
1921 | if (g_queue_mode == NULL_Q_MQ && g_use_per_node_hctx) { |
1922 | if (g_submit_queues != nr_online_nodes) { | |
9c7eddf1 | 1923 | pr_warn("submit_queues param is set to %u.\n", |
d15ee6b1 | 1924 | nr_online_nodes); |
2984c868 | 1925 | g_submit_queues = nr_online_nodes; |
fc1bc354 | 1926 | } |
2984c868 SL |
1927 | } else if (g_submit_queues > nr_cpu_ids) |
1928 | g_submit_queues = nr_cpu_ids; | |
1929 | else if (g_submit_queues <= 0) | |
1930 | g_submit_queues = 1; | |
f2298c04 | 1931 | |
2984c868 SL |
1932 | if (g_queue_mode == NULL_Q_MQ && shared_tags) { |
1933 | ret = null_init_tag_set(NULL, &tag_set); | |
db2d153d MG |
1934 | if (ret) |
1935 | return ret; | |
1936 | } | |
1937 | ||
3bf2bd20 SL |
1938 | config_group_init(&nullb_subsys.su_group); |
1939 | mutex_init(&nullb_subsys.su_mutex); | |
1940 | ||
1941 | ret = configfs_register_subsystem(&nullb_subsys); | |
1942 | if (ret) | |
1943 | goto err_tagset; | |
1944 | ||
f2298c04 JA |
1945 | mutex_init(&lock); |
1946 | ||
f2298c04 | 1947 | null_major = register_blkdev(0, "nullb"); |
db2d153d MG |
1948 | if (null_major < 0) { |
1949 | ret = null_major; | |
3bf2bd20 | 1950 | goto err_conf; |
db2d153d | 1951 | } |
f2298c04 JA |
1952 | |
1953 | for (i = 0; i < nr_devices; i++) { | |
2984c868 | 1954 | dev = null_alloc_dev(); |
30c516d7 WY |
1955 | if (!dev) { |
1956 | ret = -ENOMEM; | |
2984c868 | 1957 | goto err_dev; |
30c516d7 | 1958 | } |
2984c868 SL |
1959 | ret = null_add_dev(dev); |
1960 | if (ret) { | |
1961 | null_free_dev(dev); | |
af096e22 | 1962 | goto err_dev; |
2984c868 | 1963 | } |
f2298c04 JA |
1964 | } |
1965 | ||
9c7eddf1 | 1966 | pr_info("module loaded\n"); |
f2298c04 | 1967 | return 0; |
af096e22 MH |
1968 | |
1969 | err_dev: | |
1970 | while (!list_empty(&nullb_list)) { | |
1971 | nullb = list_entry(nullb_list.next, struct nullb, list); | |
2984c868 | 1972 | dev = nullb->dev; |
af096e22 | 1973 | null_del_dev(nullb); |
2984c868 | 1974 | null_free_dev(dev); |
af096e22 | 1975 | } |
af096e22 | 1976 | unregister_blkdev(null_major, "nullb"); |
3bf2bd20 SL |
1977 | err_conf: |
1978 | configfs_unregister_subsystem(&nullb_subsys); | |
db2d153d | 1979 | err_tagset: |
2984c868 | 1980 | if (g_queue_mode == NULL_Q_MQ && shared_tags) |
db2d153d | 1981 | blk_mq_free_tag_set(&tag_set); |
af096e22 | 1982 | return ret; |
f2298c04 JA |
1983 | } |
1984 | ||
1985 | static void __exit null_exit(void) | |
1986 | { | |
1987 | struct nullb *nullb; | |
1988 | ||
3bf2bd20 SL |
1989 | configfs_unregister_subsystem(&nullb_subsys); |
1990 | ||
f2298c04 JA |
1991 | unregister_blkdev(null_major, "nullb"); |
1992 | ||
1993 | mutex_lock(&lock); | |
1994 | while (!list_empty(&nullb_list)) { | |
2984c868 SL |
1995 | struct nullb_device *dev; |
1996 | ||
f2298c04 | 1997 | nullb = list_entry(nullb_list.next, struct nullb, list); |
2984c868 | 1998 | dev = nullb->dev; |
f2298c04 | 1999 | null_del_dev(nullb); |
2984c868 | 2000 | null_free_dev(dev); |
f2298c04 JA |
2001 | } |
2002 | mutex_unlock(&lock); | |
6bb9535b | 2003 | |
2984c868 | 2004 | if (g_queue_mode == NULL_Q_MQ && shared_tags) |
82f402fe | 2005 | blk_mq_free_tag_set(&tag_set); |
f2298c04 JA |
2006 | } |
2007 | ||
2008 | module_init(null_init); | |
2009 | module_exit(null_exit); | |
2010 | ||
231b3db1 | 2011 | MODULE_AUTHOR("Jens Axboe <axboe@kernel.dk>"); |
f2298c04 | 2012 | MODULE_LICENSE("GPL"); |