Commit | Line | Data |
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a62a8ef9 SH |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * virtio-fs: Virtio Filesystem | |
4 | * Copyright (C) 2018 Red Hat, Inc. | |
5 | */ | |
6 | ||
7 | #include <linux/fs.h> | |
22f3787e SH |
8 | #include <linux/dax.h> |
9 | #include <linux/pci.h> | |
529395d2 PJG |
10 | #include <linux/interrupt.h> |
11 | #include <linux/group_cpus.h> | |
22f3787e | 12 | #include <linux/pfn_t.h> |
dc90f084 | 13 | #include <linux/memremap.h> |
a62a8ef9 SH |
14 | #include <linux/module.h> |
15 | #include <linux/virtio.h> | |
16 | #include <linux/virtio_fs.h> | |
17 | #include <linux/delay.h> | |
18 | #include <linux/fs_context.h> | |
1dd53957 | 19 | #include <linux/fs_parser.h> |
a62a8ef9 | 20 | #include <linux/highmem.h> |
562ce828 | 21 | #include <linux/cleanup.h> |
22f3787e | 22 | #include <linux/uio.h> |
a62a8ef9 SH |
23 | #include "fuse_i.h" |
24 | ||
a7f0d7aa CK |
25 | /* Used to help calculate the FUSE connection's max_pages limit for a request's |
26 | * size. Parts of the struct fuse_req are sliced into scattergather lists in | |
27 | * addition to the pages used, so this can help account for that overhead. | |
28 | */ | |
29 | #define FUSE_HEADER_OVERHEAD 4 | |
30 | ||
a62a8ef9 SH |
31 | /* List of virtio-fs device instances and a lock for the list. Also provides |
32 | * mutual exclusion in device removal and mounting path | |
33 | */ | |
34 | static DEFINE_MUTEX(virtio_fs_mutex); | |
35 | static LIST_HEAD(virtio_fs_instances); | |
36 | ||
a8f62f50 SH |
37 | /* The /sys/fs/virtio_fs/ kset */ |
38 | static struct kset *virtio_fs_kset; | |
39 | ||
a62a8ef9 SH |
40 | enum { |
41 | VQ_HIPRIO, | |
42 | VQ_REQUEST | |
43 | }; | |
44 | ||
b43b7e81 VG |
45 | #define VQ_NAME_LEN 24 |
46 | ||
a62a8ef9 SH |
47 | /* Per-virtqueue state */ |
48 | struct virtio_fs_vq { | |
49 | spinlock_t lock; | |
50 | struct virtqueue *vq; /* protected by ->lock */ | |
51 | struct work_struct done_work; | |
52 | struct list_head queued_reqs; | |
51fecdd2 | 53 | struct list_head end_reqs; /* End these requests */ |
106e4df1 | 54 | struct work_struct dispatch_work; |
a62a8ef9 SH |
55 | struct fuse_dev *fud; |
56 | bool connected; | |
57 | long in_flight; | |
724c15a4 | 58 | struct completion in_flight_zero; /* No inflight requests */ |
87cbdc39 | 59 | struct kobject *kobj; |
b43b7e81 | 60 | char name[VQ_NAME_LEN]; |
a62a8ef9 SH |
61 | } ____cacheline_aligned_in_smp; |
62 | ||
63 | /* A virtio-fs device instance */ | |
64 | struct virtio_fs { | |
a8f62f50 | 65 | struct kobject kobj; |
87cbdc39 | 66 | struct kobject *mqs_kobj; |
a62a8ef9 SH |
67 | struct list_head list; /* on virtio_fs_instances */ |
68 | char *tag; | |
69 | struct virtio_fs_vq *vqs; | |
70 | unsigned int nvqs; /* number of virtqueues */ | |
71 | unsigned int num_request_queues; /* number of request queues */ | |
22f3787e SH |
72 | struct dax_device *dax_dev; |
73 | ||
529395d2 PJG |
74 | unsigned int *mq_map; /* index = cpu id, value = request vq id */ |
75 | ||
22f3787e SH |
76 | /* DAX memory window where file contents are mapped */ |
77 | void *window_kaddr; | |
78 | phys_addr_t window_phys_addr; | |
79 | size_t window_len; | |
a62a8ef9 SH |
80 | }; |
81 | ||
1efcf39e | 82 | struct virtio_fs_forget_req { |
a62a8ef9 SH |
83 | struct fuse_in_header ih; |
84 | struct fuse_forget_in arg; | |
1efcf39e VG |
85 | }; |
86 | ||
87 | struct virtio_fs_forget { | |
a62a8ef9 SH |
88 | /* This request can be temporarily queued on virt queue */ |
89 | struct list_head list; | |
1efcf39e | 90 | struct virtio_fs_forget_req req; |
a62a8ef9 SH |
91 | }; |
92 | ||
bb737bbe VG |
93 | struct virtio_fs_req_work { |
94 | struct fuse_req *req; | |
95 | struct virtio_fs_vq *fsvq; | |
96 | struct work_struct done_work; | |
97 | }; | |
98 | ||
a9bfd9dd VG |
99 | static int virtio_fs_enqueue_req(struct virtio_fs_vq *fsvq, |
100 | struct fuse_req *req, bool in_flight); | |
101 | ||
780b1b95 JX |
102 | static const struct constant_table dax_param_enums[] = { |
103 | {"always", FUSE_DAX_ALWAYS }, | |
104 | {"never", FUSE_DAX_NEVER }, | |
105 | {"inode", FUSE_DAX_INODE_USER }, | |
106 | {} | |
107 | }; | |
108 | ||
1dd53957 VG |
109 | enum { |
110 | OPT_DAX, | |
780b1b95 | 111 | OPT_DAX_ENUM, |
1dd53957 VG |
112 | }; |
113 | ||
114 | static const struct fs_parameter_spec virtio_fs_parameters[] = { | |
115 | fsparam_flag("dax", OPT_DAX), | |
780b1b95 | 116 | fsparam_enum("dax", OPT_DAX_ENUM, dax_param_enums), |
1dd53957 VG |
117 | {} |
118 | }; | |
119 | ||
84c21507 | 120 | static int virtio_fs_parse_param(struct fs_context *fsc, |
1dd53957 VG |
121 | struct fs_parameter *param) |
122 | { | |
123 | struct fs_parse_result result; | |
84c21507 | 124 | struct fuse_fs_context *ctx = fsc->fs_private; |
1dd53957 VG |
125 | int opt; |
126 | ||
84c21507 | 127 | opt = fs_parse(fsc, virtio_fs_parameters, param, &result); |
1dd53957 VG |
128 | if (opt < 0) |
129 | return opt; | |
130 | ||
131 | switch (opt) { | |
132 | case OPT_DAX: | |
780b1b95 JX |
133 | ctx->dax_mode = FUSE_DAX_ALWAYS; |
134 | break; | |
135 | case OPT_DAX_ENUM: | |
136 | ctx->dax_mode = result.uint_32; | |
1dd53957 VG |
137 | break; |
138 | default: | |
139 | return -EINVAL; | |
140 | } | |
141 | ||
142 | return 0; | |
143 | } | |
144 | ||
84c21507 | 145 | static void virtio_fs_free_fsc(struct fs_context *fsc) |
1dd53957 | 146 | { |
84c21507 | 147 | struct fuse_fs_context *ctx = fsc->fs_private; |
1dd53957 VG |
148 | |
149 | kfree(ctx); | |
150 | } | |
151 | ||
a62a8ef9 SH |
152 | static inline struct virtio_fs_vq *vq_to_fsvq(struct virtqueue *vq) |
153 | { | |
154 | struct virtio_fs *fs = vq->vdev->priv; | |
155 | ||
156 | return &fs->vqs[vq->index]; | |
157 | } | |
158 | ||
c17ea009 VG |
159 | /* Should be called with fsvq->lock held. */ |
160 | static inline void inc_in_flight_req(struct virtio_fs_vq *fsvq) | |
161 | { | |
162 | fsvq->in_flight++; | |
163 | } | |
164 | ||
165 | /* Should be called with fsvq->lock held. */ | |
166 | static inline void dec_in_flight_req(struct virtio_fs_vq *fsvq) | |
167 | { | |
168 | WARN_ON(fsvq->in_flight <= 0); | |
169 | fsvq->in_flight--; | |
724c15a4 VG |
170 | if (!fsvq->in_flight) |
171 | complete(&fsvq->in_flight_zero); | |
c17ea009 VG |
172 | } |
173 | ||
a8f62f50 SH |
174 | static ssize_t tag_show(struct kobject *kobj, |
175 | struct kobj_attribute *attr, char *buf) | |
176 | { | |
177 | struct virtio_fs *fs = container_of(kobj, struct virtio_fs, kobj); | |
178 | ||
96d88f65 | 179 | return sysfs_emit(buf, "%s\n", fs->tag); |
a8f62f50 SH |
180 | } |
181 | ||
182 | static struct kobj_attribute virtio_fs_tag_attr = __ATTR_RO(tag); | |
183 | ||
184 | static struct attribute *virtio_fs_attrs[] = { | |
185 | &virtio_fs_tag_attr.attr, | |
186 | NULL | |
187 | }; | |
188 | ATTRIBUTE_GROUPS(virtio_fs); | |
189 | ||
190 | static void virtio_fs_ktype_release(struct kobject *kobj) | |
a62a8ef9 | 191 | { |
a8f62f50 | 192 | struct virtio_fs *vfs = container_of(kobj, struct virtio_fs, kobj); |
a62a8ef9 | 193 | |
529395d2 | 194 | kfree(vfs->mq_map); |
a62a8ef9 SH |
195 | kfree(vfs->vqs); |
196 | kfree(vfs); | |
197 | } | |
198 | ||
a8f62f50 SH |
199 | static const struct kobj_type virtio_fs_ktype = { |
200 | .release = virtio_fs_ktype_release, | |
201 | .sysfs_ops = &kobj_sysfs_ops, | |
202 | .default_groups = virtio_fs_groups, | |
203 | }; | |
204 | ||
87cbdc39 MG |
205 | static struct virtio_fs_vq *virtio_fs_kobj_to_vq(struct virtio_fs *fs, |
206 | struct kobject *kobj) | |
207 | { | |
208 | int i; | |
209 | ||
210 | for (i = 0; i < fs->nvqs; i++) { | |
211 | if (kobj == fs->vqs[i].kobj) | |
212 | return &fs->vqs[i]; | |
213 | } | |
214 | return NULL; | |
215 | } | |
216 | ||
217 | static ssize_t name_show(struct kobject *kobj, | |
218 | struct kobj_attribute *attr, char *buf) | |
219 | { | |
220 | struct virtio_fs *fs = container_of(kobj->parent->parent, struct virtio_fs, kobj); | |
221 | struct virtio_fs_vq *fsvq = virtio_fs_kobj_to_vq(fs, kobj); | |
222 | ||
223 | if (!fsvq) | |
224 | return -EINVAL; | |
225 | return sysfs_emit(buf, "%s\n", fsvq->name); | |
226 | } | |
227 | ||
228 | static struct kobj_attribute virtio_fs_vq_name_attr = __ATTR_RO(name); | |
229 | ||
230 | static ssize_t cpu_list_show(struct kobject *kobj, | |
231 | struct kobj_attribute *attr, char *buf) | |
232 | { | |
233 | struct virtio_fs *fs = container_of(kobj->parent->parent, struct virtio_fs, kobj); | |
234 | struct virtio_fs_vq *fsvq = virtio_fs_kobj_to_vq(fs, kobj); | |
235 | unsigned int cpu, qid; | |
236 | const size_t size = PAGE_SIZE - 1; | |
237 | bool first = true; | |
238 | int ret = 0, pos = 0; | |
239 | ||
240 | if (!fsvq) | |
241 | return -EINVAL; | |
242 | ||
243 | qid = fsvq->vq->index; | |
244 | for (cpu = 0; cpu < nr_cpu_ids; cpu++) { | |
245 | if (qid < VQ_REQUEST || (fs->mq_map[cpu] == qid - VQ_REQUEST)) { | |
246 | if (first) | |
247 | ret = snprintf(buf + pos, size - pos, "%u", cpu); | |
248 | else | |
249 | ret = snprintf(buf + pos, size - pos, ", %u", cpu); | |
250 | ||
251 | if (ret >= size - pos) | |
252 | break; | |
253 | first = false; | |
254 | pos += ret; | |
255 | } | |
256 | } | |
257 | ret = snprintf(buf + pos, size + 1 - pos, "\n"); | |
258 | return pos + ret; | |
259 | } | |
260 | ||
261 | static struct kobj_attribute virtio_fs_vq_cpu_list_attr = __ATTR_RO(cpu_list); | |
262 | ||
263 | static struct attribute *virtio_fs_vq_attrs[] = { | |
264 | &virtio_fs_vq_name_attr.attr, | |
265 | &virtio_fs_vq_cpu_list_attr.attr, | |
266 | NULL | |
267 | }; | |
268 | ||
269 | static struct attribute_group virtio_fs_vq_attr_group = { | |
270 | .attrs = virtio_fs_vq_attrs, | |
271 | }; | |
272 | ||
a62a8ef9 | 273 | /* Make sure virtiofs_mutex is held */ |
4045b642 | 274 | static void virtio_fs_put_locked(struct virtio_fs *fs) |
a62a8ef9 | 275 | { |
4045b642 MG |
276 | lockdep_assert_held(&virtio_fs_mutex); |
277 | ||
a8f62f50 | 278 | kobject_put(&fs->kobj); |
a62a8ef9 SH |
279 | } |
280 | ||
4045b642 MG |
281 | static void virtio_fs_put(struct virtio_fs *fs) |
282 | { | |
283 | mutex_lock(&virtio_fs_mutex); | |
284 | virtio_fs_put_locked(fs); | |
285 | mutex_unlock(&virtio_fs_mutex); | |
286 | } | |
287 | ||
a62a8ef9 SH |
288 | static void virtio_fs_fiq_release(struct fuse_iqueue *fiq) |
289 | { | |
290 | struct virtio_fs *vfs = fiq->priv; | |
291 | ||
a62a8ef9 | 292 | virtio_fs_put(vfs); |
a62a8ef9 SH |
293 | } |
294 | ||
295 | static void virtio_fs_drain_queue(struct virtio_fs_vq *fsvq) | |
296 | { | |
297 | WARN_ON(fsvq->in_flight < 0); | |
298 | ||
299 | /* Wait for in flight requests to finish.*/ | |
724c15a4 VG |
300 | spin_lock(&fsvq->lock); |
301 | if (fsvq->in_flight) { | |
302 | /* We are holding virtio_fs_mutex. There should not be any | |
303 | * waiters waiting for completion. | |
304 | */ | |
305 | reinit_completion(&fsvq->in_flight_zero); | |
306 | spin_unlock(&fsvq->lock); | |
307 | wait_for_completion(&fsvq->in_flight_zero); | |
308 | } else { | |
a62a8ef9 | 309 | spin_unlock(&fsvq->lock); |
a62a8ef9 SH |
310 | } |
311 | ||
312 | flush_work(&fsvq->done_work); | |
106e4df1 | 313 | flush_work(&fsvq->dispatch_work); |
a62a8ef9 SH |
314 | } |
315 | ||
724c15a4 | 316 | static void virtio_fs_drain_all_queues_locked(struct virtio_fs *fs) |
a62a8ef9 SH |
317 | { |
318 | struct virtio_fs_vq *fsvq; | |
319 | int i; | |
320 | ||
321 | for (i = 0; i < fs->nvqs; i++) { | |
322 | fsvq = &fs->vqs[i]; | |
a62a8ef9 SH |
323 | virtio_fs_drain_queue(fsvq); |
324 | } | |
325 | } | |
326 | ||
724c15a4 VG |
327 | static void virtio_fs_drain_all_queues(struct virtio_fs *fs) |
328 | { | |
329 | /* Provides mutual exclusion between ->remove and ->kill_sb | |
330 | * paths. We don't want both of these draining queue at the | |
331 | * same time. Current completion logic reinits completion | |
332 | * and that means there should not be any other thread | |
333 | * doing reinit or waiting for completion already. | |
334 | */ | |
335 | mutex_lock(&virtio_fs_mutex); | |
336 | virtio_fs_drain_all_queues_locked(fs); | |
337 | mutex_unlock(&virtio_fs_mutex); | |
338 | } | |
339 | ||
a62a8ef9 SH |
340 | static void virtio_fs_start_all_queues(struct virtio_fs *fs) |
341 | { | |
342 | struct virtio_fs_vq *fsvq; | |
343 | int i; | |
344 | ||
345 | for (i = 0; i < fs->nvqs; i++) { | |
346 | fsvq = &fs->vqs[i]; | |
347 | spin_lock(&fsvq->lock); | |
348 | fsvq->connected = true; | |
349 | spin_unlock(&fsvq->lock); | |
350 | } | |
351 | } | |
352 | ||
87cbdc39 MG |
353 | static void virtio_fs_delete_queues_sysfs(struct virtio_fs *fs) |
354 | { | |
355 | struct virtio_fs_vq *fsvq; | |
356 | int i; | |
357 | ||
358 | for (i = 0; i < fs->nvqs; i++) { | |
359 | fsvq = &fs->vqs[i]; | |
360 | kobject_put(fsvq->kobj); | |
361 | } | |
362 | } | |
363 | ||
364 | static int virtio_fs_add_queues_sysfs(struct virtio_fs *fs) | |
365 | { | |
366 | struct virtio_fs_vq *fsvq; | |
367 | char buff[12]; | |
368 | int i, j, ret; | |
369 | ||
370 | for (i = 0; i < fs->nvqs; i++) { | |
371 | fsvq = &fs->vqs[i]; | |
372 | ||
373 | sprintf(buff, "%d", i); | |
374 | fsvq->kobj = kobject_create_and_add(buff, fs->mqs_kobj); | |
375 | if (!fs->mqs_kobj) { | |
376 | ret = -ENOMEM; | |
377 | goto out_del; | |
378 | } | |
379 | ||
380 | ret = sysfs_create_group(fsvq->kobj, &virtio_fs_vq_attr_group); | |
381 | if (ret) { | |
382 | kobject_put(fsvq->kobj); | |
383 | goto out_del; | |
384 | } | |
385 | } | |
386 | ||
387 | return 0; | |
388 | ||
389 | out_del: | |
390 | for (j = 0; j < i; j++) { | |
391 | fsvq = &fs->vqs[j]; | |
392 | kobject_put(fsvq->kobj); | |
393 | } | |
394 | return ret; | |
395 | } | |
396 | ||
a62a8ef9 | 397 | /* Add a new instance to the list or return -EEXIST if tag name exists*/ |
a8f62f50 SH |
398 | static int virtio_fs_add_instance(struct virtio_device *vdev, |
399 | struct virtio_fs *fs) | |
a62a8ef9 SH |
400 | { |
401 | struct virtio_fs *fs2; | |
a8f62f50 | 402 | int ret; |
a62a8ef9 SH |
403 | |
404 | mutex_lock(&virtio_fs_mutex); | |
405 | ||
406 | list_for_each_entry(fs2, &virtio_fs_instances, list) { | |
a8f62f50 SH |
407 | if (strcmp(fs->tag, fs2->tag) == 0) { |
408 | mutex_unlock(&virtio_fs_mutex); | |
409 | return -EEXIST; | |
410 | } | |
a62a8ef9 SH |
411 | } |
412 | ||
a8f62f50 SH |
413 | /* Use the virtio_device's index as a unique identifier, there is no |
414 | * need to allocate our own identifiers because the virtio_fs instance | |
415 | * is only visible to userspace as long as the underlying virtio_device | |
416 | * exists. | |
417 | */ | |
418 | fs->kobj.kset = virtio_fs_kset; | |
419 | ret = kobject_add(&fs->kobj, NULL, "%d", vdev->index); | |
87cbdc39 MG |
420 | if (ret < 0) |
421 | goto out_unlock; | |
422 | ||
423 | fs->mqs_kobj = kobject_create_and_add("mqs", &fs->kobj); | |
424 | if (!fs->mqs_kobj) { | |
425 | ret = -ENOMEM; | |
426 | goto out_del; | |
a8f62f50 SH |
427 | } |
428 | ||
429 | ret = sysfs_create_link(&fs->kobj, &vdev->dev.kobj, "device"); | |
87cbdc39 MG |
430 | if (ret < 0) |
431 | goto out_put; | |
432 | ||
433 | ret = virtio_fs_add_queues_sysfs(fs); | |
434 | if (ret) | |
435 | goto out_remove; | |
a62a8ef9 | 436 | |
a8f62f50 | 437 | list_add_tail(&fs->list, &virtio_fs_instances); |
a62a8ef9 SH |
438 | |
439 | mutex_unlock(&virtio_fs_mutex); | |
440 | ||
9086b2d9 SH |
441 | kobject_uevent(&fs->kobj, KOBJ_ADD); |
442 | ||
a62a8ef9 | 443 | return 0; |
87cbdc39 MG |
444 | |
445 | out_remove: | |
446 | sysfs_remove_link(&fs->kobj, "device"); | |
447 | out_put: | |
448 | kobject_put(fs->mqs_kobj); | |
449 | out_del: | |
450 | kobject_del(&fs->kobj); | |
451 | out_unlock: | |
452 | mutex_unlock(&virtio_fs_mutex); | |
453 | return ret; | |
a62a8ef9 SH |
454 | } |
455 | ||
456 | /* Return the virtio_fs with a given tag, or NULL */ | |
457 | static struct virtio_fs *virtio_fs_find_instance(const char *tag) | |
458 | { | |
459 | struct virtio_fs *fs; | |
460 | ||
461 | mutex_lock(&virtio_fs_mutex); | |
462 | ||
463 | list_for_each_entry(fs, &virtio_fs_instances, list) { | |
464 | if (strcmp(fs->tag, tag) == 0) { | |
a8f62f50 | 465 | kobject_get(&fs->kobj); |
a62a8ef9 SH |
466 | goto found; |
467 | } | |
468 | } | |
469 | ||
470 | fs = NULL; /* not found */ | |
471 | ||
472 | found: | |
473 | mutex_unlock(&virtio_fs_mutex); | |
474 | ||
475 | return fs; | |
476 | } | |
477 | ||
478 | static void virtio_fs_free_devs(struct virtio_fs *fs) | |
479 | { | |
480 | unsigned int i; | |
481 | ||
482 | for (i = 0; i < fs->nvqs; i++) { | |
483 | struct virtio_fs_vq *fsvq = &fs->vqs[i]; | |
484 | ||
485 | if (!fsvq->fud) | |
486 | continue; | |
487 | ||
488 | fuse_dev_free(fsvq->fud); | |
489 | fsvq->fud = NULL; | |
490 | } | |
491 | } | |
492 | ||
493 | /* Read filesystem name from virtio config into fs->tag (must kfree()). */ | |
494 | static int virtio_fs_read_tag(struct virtio_device *vdev, struct virtio_fs *fs) | |
495 | { | |
496 | char tag_buf[sizeof_field(struct virtio_fs_config, tag)]; | |
497 | char *end; | |
498 | size_t len; | |
499 | ||
500 | virtio_cread_bytes(vdev, offsetof(struct virtio_fs_config, tag), | |
501 | &tag_buf, sizeof(tag_buf)); | |
502 | end = memchr(tag_buf, '\0', sizeof(tag_buf)); | |
503 | if (end == tag_buf) | |
504 | return -EINVAL; /* empty tag */ | |
505 | if (!end) | |
506 | end = &tag_buf[sizeof(tag_buf)]; | |
507 | ||
508 | len = end - tag_buf; | |
509 | fs->tag = devm_kmalloc(&vdev->dev, len + 1, GFP_KERNEL); | |
510 | if (!fs->tag) | |
511 | return -ENOMEM; | |
512 | memcpy(fs->tag, tag_buf, len); | |
513 | fs->tag[len] = '\0'; | |
40488cc1 SH |
514 | |
515 | /* While the VIRTIO specification allows any character, newlines are | |
516 | * awkward on mount(8) command-lines and cause problems in the sysfs | |
517 | * "tag" attr and uevent TAG= properties. Forbid them. | |
518 | */ | |
519 | if (strchr(fs->tag, '\n')) { | |
520 | dev_dbg(&vdev->dev, "refusing virtiofs tag with newline character\n"); | |
521 | return -EINVAL; | |
522 | } | |
523 | ||
a62a8ef9 SH |
524 | return 0; |
525 | } | |
526 | ||
527 | /* Work function for hiprio completion */ | |
528 | static void virtio_fs_hiprio_done_work(struct work_struct *work) | |
529 | { | |
530 | struct virtio_fs_vq *fsvq = container_of(work, struct virtio_fs_vq, | |
531 | done_work); | |
532 | struct virtqueue *vq = fsvq->vq; | |
533 | ||
534 | /* Free completed FUSE_FORGET requests */ | |
535 | spin_lock(&fsvq->lock); | |
536 | do { | |
537 | unsigned int len; | |
538 | void *req; | |
539 | ||
540 | virtqueue_disable_cb(vq); | |
541 | ||
542 | while ((req = virtqueue_get_buf(vq, &len)) != NULL) { | |
543 | kfree(req); | |
c17ea009 | 544 | dec_in_flight_req(fsvq); |
a62a8ef9 | 545 | } |
f9c29137 | 546 | } while (!virtqueue_enable_cb(vq)); |
106e4df1 PJG |
547 | |
548 | if (!list_empty(&fsvq->queued_reqs)) | |
549 | schedule_work(&fsvq->dispatch_work); | |
550 | ||
a62a8ef9 SH |
551 | spin_unlock(&fsvq->lock); |
552 | } | |
553 | ||
51fecdd2 | 554 | static void virtio_fs_request_dispatch_work(struct work_struct *work) |
a62a8ef9 | 555 | { |
51fecdd2 VG |
556 | struct fuse_req *req; |
557 | struct virtio_fs_vq *fsvq = container_of(work, struct virtio_fs_vq, | |
106e4df1 | 558 | dispatch_work); |
a9bfd9dd | 559 | int ret; |
51fecdd2 VG |
560 | |
561 | pr_debug("virtio-fs: worker %s called.\n", __func__); | |
562 | while (1) { | |
563 | spin_lock(&fsvq->lock); | |
564 | req = list_first_entry_or_null(&fsvq->end_reqs, struct fuse_req, | |
565 | list); | |
566 | if (!req) { | |
567 | spin_unlock(&fsvq->lock); | |
a9bfd9dd | 568 | break; |
51fecdd2 VG |
569 | } |
570 | ||
571 | list_del_init(&req->list); | |
572 | spin_unlock(&fsvq->lock); | |
8f622e94 | 573 | fuse_request_end(req); |
51fecdd2 | 574 | } |
a9bfd9dd VG |
575 | |
576 | /* Dispatch pending requests */ | |
577 | while (1) { | |
578 | spin_lock(&fsvq->lock); | |
579 | req = list_first_entry_or_null(&fsvq->queued_reqs, | |
580 | struct fuse_req, list); | |
581 | if (!req) { | |
582 | spin_unlock(&fsvq->lock); | |
583 | return; | |
584 | } | |
585 | list_del_init(&req->list); | |
586 | spin_unlock(&fsvq->lock); | |
587 | ||
588 | ret = virtio_fs_enqueue_req(fsvq, req, true); | |
589 | if (ret < 0) { | |
2106e1f4 | 590 | if (ret == -ENOSPC) { |
a9bfd9dd VG |
591 | spin_lock(&fsvq->lock); |
592 | list_add_tail(&req->list, &fsvq->queued_reqs); | |
a9bfd9dd VG |
593 | spin_unlock(&fsvq->lock); |
594 | return; | |
595 | } | |
596 | req->out.h.error = ret; | |
597 | spin_lock(&fsvq->lock); | |
598 | dec_in_flight_req(fsvq); | |
599 | spin_unlock(&fsvq->lock); | |
600 | pr_err("virtio-fs: virtio_fs_enqueue_req() failed %d\n", | |
601 | ret); | |
8f622e94 | 602 | fuse_request_end(req); |
a9bfd9dd VG |
603 | } |
604 | } | |
a62a8ef9 SH |
605 | } |
606 | ||
58ada94f VG |
607 | /* |
608 | * Returns 1 if queue is full and sender should wait a bit before sending | |
609 | * next request, 0 otherwise. | |
610 | */ | |
611 | static int send_forget_request(struct virtio_fs_vq *fsvq, | |
612 | struct virtio_fs_forget *forget, | |
613 | bool in_flight) | |
614 | { | |
615 | struct scatterlist sg; | |
616 | struct virtqueue *vq; | |
617 | int ret = 0; | |
618 | bool notify; | |
1efcf39e | 619 | struct virtio_fs_forget_req *req = &forget->req; |
58ada94f VG |
620 | |
621 | spin_lock(&fsvq->lock); | |
622 | if (!fsvq->connected) { | |
623 | if (in_flight) | |
624 | dec_in_flight_req(fsvq); | |
625 | kfree(forget); | |
626 | goto out; | |
627 | } | |
628 | ||
1efcf39e | 629 | sg_init_one(&sg, req, sizeof(*req)); |
58ada94f VG |
630 | vq = fsvq->vq; |
631 | dev_dbg(&vq->vdev->dev, "%s\n", __func__); | |
632 | ||
633 | ret = virtqueue_add_outbuf(vq, &sg, 1, forget, GFP_ATOMIC); | |
634 | if (ret < 0) { | |
2106e1f4 | 635 | if (ret == -ENOSPC) { |
58ada94f VG |
636 | pr_debug("virtio-fs: Could not queue FORGET: err=%d. Will try later\n", |
637 | ret); | |
638 | list_add_tail(&forget->list, &fsvq->queued_reqs); | |
58ada94f VG |
639 | if (!in_flight) |
640 | inc_in_flight_req(fsvq); | |
641 | /* Queue is full */ | |
642 | ret = 1; | |
643 | } else { | |
644 | pr_debug("virtio-fs: Could not queue FORGET: err=%d. Dropping it.\n", | |
645 | ret); | |
646 | kfree(forget); | |
647 | if (in_flight) | |
648 | dec_in_flight_req(fsvq); | |
649 | } | |
650 | goto out; | |
651 | } | |
652 | ||
653 | if (!in_flight) | |
654 | inc_in_flight_req(fsvq); | |
655 | notify = virtqueue_kick_prepare(vq); | |
656 | spin_unlock(&fsvq->lock); | |
657 | ||
658 | if (notify) | |
659 | virtqueue_notify(vq); | |
660 | return ret; | |
661 | out: | |
662 | spin_unlock(&fsvq->lock); | |
663 | return ret; | |
664 | } | |
665 | ||
a62a8ef9 SH |
666 | static void virtio_fs_hiprio_dispatch_work(struct work_struct *work) |
667 | { | |
668 | struct virtio_fs_forget *forget; | |
669 | struct virtio_fs_vq *fsvq = container_of(work, struct virtio_fs_vq, | |
106e4df1 | 670 | dispatch_work); |
a62a8ef9 SH |
671 | pr_debug("virtio-fs: worker %s called.\n", __func__); |
672 | while (1) { | |
673 | spin_lock(&fsvq->lock); | |
674 | forget = list_first_entry_or_null(&fsvq->queued_reqs, | |
675 | struct virtio_fs_forget, list); | |
676 | if (!forget) { | |
677 | spin_unlock(&fsvq->lock); | |
678 | return; | |
679 | } | |
680 | ||
681 | list_del(&forget->list); | |
a62a8ef9 | 682 | spin_unlock(&fsvq->lock); |
58ada94f VG |
683 | if (send_forget_request(fsvq, forget, true)) |
684 | return; | |
a62a8ef9 SH |
685 | } |
686 | } | |
687 | ||
688 | /* Allocate and copy args into req->argbuf */ | |
689 | static int copy_args_to_argbuf(struct fuse_req *req) | |
690 | { | |
691 | struct fuse_args *args = req->args; | |
692 | unsigned int offset = 0; | |
693 | unsigned int num_in; | |
694 | unsigned int num_out; | |
695 | unsigned int len; | |
696 | unsigned int i; | |
697 | ||
698 | num_in = args->in_numargs - args->in_pages; | |
699 | num_out = args->out_numargs - args->out_pages; | |
700 | len = fuse_len_args(num_in, (struct fuse_arg *) args->in_args) + | |
701 | fuse_len_args(num_out, args->out_args); | |
702 | ||
703 | req->argbuf = kmalloc(len, GFP_ATOMIC); | |
704 | if (!req->argbuf) | |
705 | return -ENOMEM; | |
706 | ||
707 | for (i = 0; i < num_in; i++) { | |
708 | memcpy(req->argbuf + offset, | |
709 | args->in_args[i].value, | |
710 | args->in_args[i].size); | |
711 | offset += args->in_args[i].size; | |
712 | } | |
713 | ||
714 | return 0; | |
715 | } | |
716 | ||
717 | /* Copy args out of and free req->argbuf */ | |
718 | static void copy_args_from_argbuf(struct fuse_args *args, struct fuse_req *req) | |
719 | { | |
720 | unsigned int remaining; | |
721 | unsigned int offset; | |
722 | unsigned int num_in; | |
723 | unsigned int num_out; | |
724 | unsigned int i; | |
725 | ||
726 | remaining = req->out.h.len - sizeof(req->out.h); | |
727 | num_in = args->in_numargs - args->in_pages; | |
728 | num_out = args->out_numargs - args->out_pages; | |
729 | offset = fuse_len_args(num_in, (struct fuse_arg *)args->in_args); | |
730 | ||
731 | for (i = 0; i < num_out; i++) { | |
732 | unsigned int argsize = args->out_args[i].size; | |
733 | ||
734 | if (args->out_argvar && | |
735 | i == args->out_numargs - 1 && | |
736 | argsize > remaining) { | |
737 | argsize = remaining; | |
738 | } | |
739 | ||
740 | memcpy(args->out_args[i].value, req->argbuf + offset, argsize); | |
741 | offset += argsize; | |
742 | ||
743 | if (i != args->out_numargs - 1) | |
744 | remaining -= argsize; | |
745 | } | |
746 | ||
747 | /* Store the actual size of the variable-length arg */ | |
748 | if (args->out_argvar) | |
749 | args->out_args[args->out_numargs - 1].size = remaining; | |
750 | ||
751 | kfree(req->argbuf); | |
752 | req->argbuf = NULL; | |
753 | } | |
754 | ||
755 | /* Work function for request completion */ | |
bb737bbe VG |
756 | static void virtio_fs_request_complete(struct fuse_req *req, |
757 | struct virtio_fs_vq *fsvq) | |
758 | { | |
759 | struct fuse_pqueue *fpq = &fsvq->fud->pq; | |
bb737bbe VG |
760 | struct fuse_args *args; |
761 | struct fuse_args_pages *ap; | |
762 | unsigned int len, i, thislen; | |
763 | struct page *page; | |
764 | ||
765 | /* | |
766 | * TODO verify that server properly follows FUSE protocol | |
767 | * (oh.uniq, oh.len) | |
768 | */ | |
769 | args = req->args; | |
770 | copy_args_from_argbuf(args, req); | |
771 | ||
772 | if (args->out_pages && args->page_zeroing) { | |
773 | len = args->out_args[args->out_numargs - 1].size; | |
774 | ap = container_of(args, typeof(*ap), args); | |
775 | for (i = 0; i < ap->num_pages; i++) { | |
776 | thislen = ap->descs[i].length; | |
777 | if (len < thislen) { | |
778 | WARN_ON(ap->descs[i].offset); | |
779 | page = ap->pages[i]; | |
780 | zero_user_segment(page, len, thislen); | |
781 | len = 0; | |
782 | } else { | |
783 | len -= thislen; | |
784 | } | |
785 | } | |
786 | } | |
787 | ||
788 | spin_lock(&fpq->lock); | |
789 | clear_bit(FR_SENT, &req->flags); | |
790 | spin_unlock(&fpq->lock); | |
791 | ||
8f622e94 | 792 | fuse_request_end(req); |
bb737bbe VG |
793 | spin_lock(&fsvq->lock); |
794 | dec_in_flight_req(fsvq); | |
795 | spin_unlock(&fsvq->lock); | |
796 | } | |
797 | ||
798 | static void virtio_fs_complete_req_work(struct work_struct *work) | |
799 | { | |
800 | struct virtio_fs_req_work *w = | |
801 | container_of(work, typeof(*w), done_work); | |
802 | ||
803 | virtio_fs_request_complete(w->req, w->fsvq); | |
804 | kfree(w); | |
805 | } | |
806 | ||
a62a8ef9 SH |
807 | static void virtio_fs_requests_done_work(struct work_struct *work) |
808 | { | |
809 | struct virtio_fs_vq *fsvq = container_of(work, struct virtio_fs_vq, | |
810 | done_work); | |
811 | struct fuse_pqueue *fpq = &fsvq->fud->pq; | |
a62a8ef9 SH |
812 | struct virtqueue *vq = fsvq->vq; |
813 | struct fuse_req *req; | |
a62a8ef9 | 814 | struct fuse_req *next; |
bb737bbe | 815 | unsigned int len; |
a62a8ef9 SH |
816 | LIST_HEAD(reqs); |
817 | ||
818 | /* Collect completed requests off the virtqueue */ | |
819 | spin_lock(&fsvq->lock); | |
820 | do { | |
821 | virtqueue_disable_cb(vq); | |
822 | ||
823 | while ((req = virtqueue_get_buf(vq, &len)) != NULL) { | |
824 | spin_lock(&fpq->lock); | |
825 | list_move_tail(&req->list, &reqs); | |
826 | spin_unlock(&fpq->lock); | |
827 | } | |
f9c29137 | 828 | } while (!virtqueue_enable_cb(vq)); |
a62a8ef9 SH |
829 | spin_unlock(&fsvq->lock); |
830 | ||
831 | /* End requests */ | |
832 | list_for_each_entry_safe(req, next, &reqs, list) { | |
a62a8ef9 | 833 | list_del_init(&req->list); |
a62a8ef9 | 834 | |
bb737bbe VG |
835 | /* blocking async request completes in a worker context */ |
836 | if (req->args->may_block) { | |
837 | struct virtio_fs_req_work *w; | |
838 | ||
839 | w = kzalloc(sizeof(*w), GFP_NOFS | __GFP_NOFAIL); | |
840 | INIT_WORK(&w->done_work, virtio_fs_complete_req_work); | |
841 | w->fsvq = fsvq; | |
842 | w->req = req; | |
843 | schedule_work(&w->done_work); | |
844 | } else { | |
845 | virtio_fs_request_complete(req, fsvq); | |
846 | } | |
a62a8ef9 | 847 | } |
106e4df1 PJG |
848 | |
849 | /* Try to push previously queued requests, as the queue might no longer be full */ | |
850 | spin_lock(&fsvq->lock); | |
851 | if (!list_empty(&fsvq->queued_reqs)) | |
852 | schedule_work(&fsvq->dispatch_work); | |
853 | spin_unlock(&fsvq->lock); | |
a62a8ef9 SH |
854 | } |
855 | ||
529395d2 PJG |
856 | static void virtio_fs_map_queues(struct virtio_device *vdev, struct virtio_fs *fs) |
857 | { | |
858 | const struct cpumask *mask, *masks; | |
859 | unsigned int q, cpu; | |
860 | ||
861 | /* First attempt to map using existing transport layer affinities | |
862 | * e.g. PCIe MSI-X | |
863 | */ | |
864 | if (!vdev->config->get_vq_affinity) | |
865 | goto fallback; | |
866 | ||
867 | for (q = 0; q < fs->num_request_queues; q++) { | |
868 | mask = vdev->config->get_vq_affinity(vdev, VQ_REQUEST + q); | |
869 | if (!mask) | |
870 | goto fallback; | |
871 | ||
872 | for_each_cpu(cpu, mask) | |
873 | fs->mq_map[cpu] = q; | |
874 | } | |
875 | ||
876 | return; | |
877 | fallback: | |
878 | /* Attempt to map evenly in groups over the CPUs */ | |
879 | masks = group_cpus_evenly(fs->num_request_queues); | |
880 | /* If even this fails we default to all CPUs use queue zero */ | |
881 | if (!masks) { | |
882 | for_each_possible_cpu(cpu) | |
883 | fs->mq_map[cpu] = 0; | |
884 | return; | |
885 | } | |
886 | ||
887 | for (q = 0; q < fs->num_request_queues; q++) { | |
888 | for_each_cpu(cpu, &masks[q]) | |
889 | fs->mq_map[cpu] = q; | |
890 | } | |
891 | kfree(masks); | |
892 | } | |
893 | ||
a62a8ef9 SH |
894 | /* Virtqueue interrupt handler */ |
895 | static void virtio_fs_vq_done(struct virtqueue *vq) | |
896 | { | |
897 | struct virtio_fs_vq *fsvq = vq_to_fsvq(vq); | |
898 | ||
899 | dev_dbg(&vq->vdev->dev, "%s %s\n", __func__, fsvq->name); | |
900 | ||
901 | schedule_work(&fsvq->done_work); | |
902 | } | |
903 | ||
b43b7e81 VG |
904 | static void virtio_fs_init_vq(struct virtio_fs_vq *fsvq, char *name, |
905 | int vq_type) | |
906 | { | |
7c594bbd | 907 | strscpy(fsvq->name, name, VQ_NAME_LEN); |
b43b7e81 VG |
908 | spin_lock_init(&fsvq->lock); |
909 | INIT_LIST_HEAD(&fsvq->queued_reqs); | |
910 | INIT_LIST_HEAD(&fsvq->end_reqs); | |
911 | init_completion(&fsvq->in_flight_zero); | |
912 | ||
913 | if (vq_type == VQ_REQUEST) { | |
914 | INIT_WORK(&fsvq->done_work, virtio_fs_requests_done_work); | |
106e4df1 PJG |
915 | INIT_WORK(&fsvq->dispatch_work, |
916 | virtio_fs_request_dispatch_work); | |
b43b7e81 VG |
917 | } else { |
918 | INIT_WORK(&fsvq->done_work, virtio_fs_hiprio_done_work); | |
106e4df1 PJG |
919 | INIT_WORK(&fsvq->dispatch_work, |
920 | virtio_fs_hiprio_dispatch_work); | |
b43b7e81 VG |
921 | } |
922 | } | |
923 | ||
a62a8ef9 SH |
924 | /* Initialize virtqueues */ |
925 | static int virtio_fs_setup_vqs(struct virtio_device *vdev, | |
926 | struct virtio_fs *fs) | |
927 | { | |
fc496dcd | 928 | struct virtqueue_info *vqs_info; |
a62a8ef9 | 929 | struct virtqueue **vqs; |
529395d2 PJG |
930 | /* Specify pre_vectors to ensure that the queues before the |
931 | * request queues (e.g. hiprio) don't claim any of the CPUs in | |
932 | * the multi-queue mapping and interrupt affinities | |
933 | */ | |
934 | struct irq_affinity desc = { .pre_vectors = VQ_REQUEST }; | |
a62a8ef9 SH |
935 | unsigned int i; |
936 | int ret = 0; | |
937 | ||
2c0349ec MT |
938 | virtio_cread_le(vdev, struct virtio_fs_config, num_request_queues, |
939 | &fs->num_request_queues); | |
a62a8ef9 SH |
940 | if (fs->num_request_queues == 0) |
941 | return -EINVAL; | |
942 | ||
103c2de1 PJG |
943 | /* Truncate nr of request queues to nr_cpu_id */ |
944 | fs->num_request_queues = min_t(unsigned int, fs->num_request_queues, | |
945 | nr_cpu_ids); | |
b43b7e81 | 946 | fs->nvqs = VQ_REQUEST + fs->num_request_queues; |
a62a8ef9 SH |
947 | fs->vqs = kcalloc(fs->nvqs, sizeof(fs->vqs[VQ_HIPRIO]), GFP_KERNEL); |
948 | if (!fs->vqs) | |
949 | return -ENOMEM; | |
950 | ||
951 | vqs = kmalloc_array(fs->nvqs, sizeof(vqs[VQ_HIPRIO]), GFP_KERNEL); | |
529395d2 PJG |
952 | fs->mq_map = kcalloc_node(nr_cpu_ids, sizeof(*fs->mq_map), GFP_KERNEL, |
953 | dev_to_node(&vdev->dev)); | |
fc496dcd JP |
954 | vqs_info = kcalloc(fs->nvqs, sizeof(*vqs_info), GFP_KERNEL); |
955 | if (!vqs || !vqs_info || !fs->mq_map) { | |
a62a8ef9 SH |
956 | ret = -ENOMEM; |
957 | goto out; | |
958 | } | |
959 | ||
b43b7e81 | 960 | /* Initialize the hiprio/forget request virtqueue */ |
fc496dcd | 961 | vqs_info[VQ_HIPRIO].callback = virtio_fs_vq_done; |
b43b7e81 | 962 | virtio_fs_init_vq(&fs->vqs[VQ_HIPRIO], "hiprio", VQ_HIPRIO); |
fc496dcd | 963 | vqs_info[VQ_HIPRIO].name = fs->vqs[VQ_HIPRIO].name; |
a62a8ef9 SH |
964 | |
965 | /* Initialize the requests virtqueues */ | |
966 | for (i = VQ_REQUEST; i < fs->nvqs; i++) { | |
b43b7e81 VG |
967 | char vq_name[VQ_NAME_LEN]; |
968 | ||
969 | snprintf(vq_name, VQ_NAME_LEN, "requests.%u", i - VQ_REQUEST); | |
970 | virtio_fs_init_vq(&fs->vqs[i], vq_name, VQ_REQUEST); | |
fc496dcd JP |
971 | vqs_info[i].callback = virtio_fs_vq_done; |
972 | vqs_info[i].name = fs->vqs[i].name; | |
a62a8ef9 SH |
973 | } |
974 | ||
6c85d6b6 | 975 | ret = virtio_find_vqs(vdev, fs->nvqs, vqs, vqs_info, &desc); |
a62a8ef9 SH |
976 | if (ret < 0) |
977 | goto out; | |
978 | ||
979 | for (i = 0; i < fs->nvqs; i++) | |
980 | fs->vqs[i].vq = vqs[i]; | |
981 | ||
982 | virtio_fs_start_all_queues(fs); | |
983 | out: | |
fc496dcd | 984 | kfree(vqs_info); |
a62a8ef9 | 985 | kfree(vqs); |
529395d2 | 986 | if (ret) { |
a62a8ef9 | 987 | kfree(fs->vqs); |
529395d2 PJG |
988 | kfree(fs->mq_map); |
989 | } | |
a62a8ef9 SH |
990 | return ret; |
991 | } | |
992 | ||
993 | /* Free virtqueues (device must already be reset) */ | |
1e5b9e04 | 994 | static void virtio_fs_cleanup_vqs(struct virtio_device *vdev) |
a62a8ef9 SH |
995 | { |
996 | vdev->config->del_vqs(vdev); | |
997 | } | |
998 | ||
22f3787e SH |
999 | /* Map a window offset to a page frame number. The window offset will have |
1000 | * been produced by .iomap_begin(), which maps a file offset to a window | |
1001 | * offset. | |
1002 | */ | |
1003 | static long virtio_fs_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, | |
e511c4a3 JC |
1004 | long nr_pages, enum dax_access_mode mode, |
1005 | void **kaddr, pfn_t *pfn) | |
22f3787e SH |
1006 | { |
1007 | struct virtio_fs *fs = dax_get_private(dax_dev); | |
1008 | phys_addr_t offset = PFN_PHYS(pgoff); | |
73fb2c8b | 1009 | size_t max_nr_pages = fs->window_len / PAGE_SIZE - pgoff; |
22f3787e SH |
1010 | |
1011 | if (kaddr) | |
1012 | *kaddr = fs->window_kaddr + offset; | |
1013 | if (pfn) | |
1014 | *pfn = phys_to_pfn_t(fs->window_phys_addr + offset, | |
1015 | PFN_DEV | PFN_MAP); | |
1016 | return nr_pages > max_nr_pages ? max_nr_pages : nr_pages; | |
1017 | } | |
1018 | ||
22f3787e SH |
1019 | static int virtio_fs_zero_page_range(struct dax_device *dax_dev, |
1020 | pgoff_t pgoff, size_t nr_pages) | |
1021 | { | |
1022 | long rc; | |
1023 | void *kaddr; | |
1024 | ||
e511c4a3 JC |
1025 | rc = dax_direct_access(dax_dev, pgoff, nr_pages, DAX_ACCESS, &kaddr, |
1026 | NULL); | |
22f3787e | 1027 | if (rc < 0) |
1ea7ca1b JC |
1028 | return dax_mem2blk_err(rc); |
1029 | ||
22f3787e SH |
1030 | memset(kaddr, 0, nr_pages << PAGE_SHIFT); |
1031 | dax_flush(dax_dev, kaddr, nr_pages << PAGE_SHIFT); | |
1032 | return 0; | |
1033 | } | |
1034 | ||
1035 | static const struct dax_operations virtio_fs_dax_ops = { | |
1036 | .direct_access = virtio_fs_direct_access, | |
22f3787e SH |
1037 | .zero_page_range = virtio_fs_zero_page_range, |
1038 | }; | |
1039 | ||
1040 | static void virtio_fs_cleanup_dax(void *data) | |
1041 | { | |
1042 | struct dax_device *dax_dev = data; | |
1043 | ||
1044 | kill_dax(dax_dev); | |
1045 | put_dax(dax_dev); | |
1046 | } | |
1047 | ||
562ce828 MD |
1048 | DEFINE_FREE(cleanup_dax, struct dax_dev *, if (!IS_ERR_OR_NULL(_T)) virtio_fs_cleanup_dax(_T)) |
1049 | ||
22f3787e SH |
1050 | static int virtio_fs_setup_dax(struct virtio_device *vdev, struct virtio_fs *fs) |
1051 | { | |
562ce828 | 1052 | struct dax_device *dax_dev __free(cleanup_dax) = NULL; |
22f3787e SH |
1053 | struct virtio_shm_region cache_reg; |
1054 | struct dev_pagemap *pgmap; | |
1055 | bool have_cache; | |
1056 | ||
1057 | if (!IS_ENABLED(CONFIG_FUSE_DAX)) | |
1058 | return 0; | |
1059 | ||
562ce828 MD |
1060 | dax_dev = alloc_dax(fs, &virtio_fs_dax_ops); |
1061 | if (IS_ERR(dax_dev)) { | |
1062 | int rc = PTR_ERR(dax_dev); | |
1063 | return rc == -EOPNOTSUPP ? 0 : rc; | |
1064 | } | |
1065 | ||
22f3787e SH |
1066 | /* Get cache region */ |
1067 | have_cache = virtio_get_shm_region(vdev, &cache_reg, | |
1068 | (u8)VIRTIO_FS_SHMCAP_ID_CACHE); | |
1069 | if (!have_cache) { | |
1070 | dev_notice(&vdev->dev, "%s: No cache capability\n", __func__); | |
1071 | return 0; | |
1072 | } | |
1073 | ||
1074 | if (!devm_request_mem_region(&vdev->dev, cache_reg.addr, cache_reg.len, | |
1075 | dev_name(&vdev->dev))) { | |
1076 | dev_warn(&vdev->dev, "could not reserve region addr=0x%llx len=0x%llx\n", | |
1077 | cache_reg.addr, cache_reg.len); | |
1078 | return -EBUSY; | |
1079 | } | |
1080 | ||
1081 | dev_notice(&vdev->dev, "Cache len: 0x%llx @ 0x%llx\n", cache_reg.len, | |
1082 | cache_reg.addr); | |
1083 | ||
1084 | pgmap = devm_kzalloc(&vdev->dev, sizeof(*pgmap), GFP_KERNEL); | |
1085 | if (!pgmap) | |
1086 | return -ENOMEM; | |
1087 | ||
1088 | pgmap->type = MEMORY_DEVICE_FS_DAX; | |
1089 | ||
1090 | /* Ideally we would directly use the PCI BAR resource but | |
1091 | * devm_memremap_pages() wants its own copy in pgmap. So | |
1092 | * initialize a struct resource from scratch (only the start | |
1093 | * and end fields will be used). | |
1094 | */ | |
69456535 | 1095 | pgmap->range = (struct range) { |
22f3787e SH |
1096 | .start = (phys_addr_t) cache_reg.addr, |
1097 | .end = (phys_addr_t) cache_reg.addr + cache_reg.len - 1, | |
1098 | }; | |
69456535 | 1099 | pgmap->nr_range = 1; |
22f3787e SH |
1100 | |
1101 | fs->window_kaddr = devm_memremap_pages(&vdev->dev, pgmap); | |
1102 | if (IS_ERR(fs->window_kaddr)) | |
1103 | return PTR_ERR(fs->window_kaddr); | |
1104 | ||
1105 | fs->window_phys_addr = (phys_addr_t) cache_reg.addr; | |
1106 | fs->window_len = (phys_addr_t) cache_reg.len; | |
1107 | ||
1108 | dev_dbg(&vdev->dev, "%s: window kaddr 0x%px phys_addr 0x%llx len 0x%llx\n", | |
1109 | __func__, fs->window_kaddr, cache_reg.addr, cache_reg.len); | |
1110 | ||
562ce828 | 1111 | fs->dax_dev = no_free_ptr(dax_dev); |
22f3787e SH |
1112 | return devm_add_action_or_reset(&vdev->dev, virtio_fs_cleanup_dax, |
1113 | fs->dax_dev); | |
1114 | } | |
1115 | ||
a62a8ef9 SH |
1116 | static int virtio_fs_probe(struct virtio_device *vdev) |
1117 | { | |
1118 | struct virtio_fs *fs; | |
1119 | int ret; | |
1120 | ||
1121 | fs = kzalloc(sizeof(*fs), GFP_KERNEL); | |
1122 | if (!fs) | |
1123 | return -ENOMEM; | |
a8f62f50 | 1124 | kobject_init(&fs->kobj, &virtio_fs_ktype); |
a62a8ef9 SH |
1125 | vdev->priv = fs; |
1126 | ||
1127 | ret = virtio_fs_read_tag(vdev, fs); | |
1128 | if (ret < 0) | |
1129 | goto out; | |
1130 | ||
1131 | ret = virtio_fs_setup_vqs(vdev, fs); | |
1132 | if (ret < 0) | |
1133 | goto out; | |
1134 | ||
529395d2 | 1135 | virtio_fs_map_queues(vdev, fs); |
a62a8ef9 | 1136 | |
22f3787e SH |
1137 | ret = virtio_fs_setup_dax(vdev, fs); |
1138 | if (ret < 0) | |
1139 | goto out_vqs; | |
1140 | ||
a62a8ef9 SH |
1141 | /* Bring the device online in case the filesystem is mounted and |
1142 | * requests need to be sent before we return. | |
1143 | */ | |
1144 | virtio_device_ready(vdev); | |
1145 | ||
a8f62f50 | 1146 | ret = virtio_fs_add_instance(vdev, fs); |
a62a8ef9 SH |
1147 | if (ret < 0) |
1148 | goto out_vqs; | |
1149 | ||
1150 | return 0; | |
1151 | ||
1152 | out_vqs: | |
d9679d00 | 1153 | virtio_reset_device(vdev); |
1e5b9e04 | 1154 | virtio_fs_cleanup_vqs(vdev); |
a62a8ef9 SH |
1155 | |
1156 | out: | |
1157 | vdev->priv = NULL; | |
a8f62f50 | 1158 | kobject_put(&fs->kobj); |
a62a8ef9 SH |
1159 | return ret; |
1160 | } | |
1161 | ||
1162 | static void virtio_fs_stop_all_queues(struct virtio_fs *fs) | |
1163 | { | |
1164 | struct virtio_fs_vq *fsvq; | |
1165 | int i; | |
1166 | ||
1167 | for (i = 0; i < fs->nvqs; i++) { | |
1168 | fsvq = &fs->vqs[i]; | |
1169 | spin_lock(&fsvq->lock); | |
1170 | fsvq->connected = false; | |
1171 | spin_unlock(&fsvq->lock); | |
1172 | } | |
1173 | } | |
1174 | ||
1175 | static void virtio_fs_remove(struct virtio_device *vdev) | |
1176 | { | |
1177 | struct virtio_fs *fs = vdev->priv; | |
1178 | ||
1179 | mutex_lock(&virtio_fs_mutex); | |
1180 | /* This device is going away. No one should get new reference */ | |
1181 | list_del_init(&fs->list); | |
87cbdc39 | 1182 | virtio_fs_delete_queues_sysfs(fs); |
a8f62f50 | 1183 | sysfs_remove_link(&fs->kobj, "device"); |
87cbdc39 | 1184 | kobject_put(fs->mqs_kobj); |
a8f62f50 | 1185 | kobject_del(&fs->kobj); |
a62a8ef9 | 1186 | virtio_fs_stop_all_queues(fs); |
724c15a4 | 1187 | virtio_fs_drain_all_queues_locked(fs); |
d9679d00 | 1188 | virtio_reset_device(vdev); |
1e5b9e04 | 1189 | virtio_fs_cleanup_vqs(vdev); |
a62a8ef9 SH |
1190 | |
1191 | vdev->priv = NULL; | |
1192 | /* Put device reference on virtio_fs object */ | |
4045b642 | 1193 | virtio_fs_put_locked(fs); |
a62a8ef9 SH |
1194 | mutex_unlock(&virtio_fs_mutex); |
1195 | } | |
1196 | ||
1197 | #ifdef CONFIG_PM_SLEEP | |
1198 | static int virtio_fs_freeze(struct virtio_device *vdev) | |
1199 | { | |
1200 | /* TODO need to save state here */ | |
1201 | pr_warn("virtio-fs: suspend/resume not yet supported\n"); | |
1202 | return -EOPNOTSUPP; | |
1203 | } | |
1204 | ||
1205 | static int virtio_fs_restore(struct virtio_device *vdev) | |
1206 | { | |
1207 | /* TODO need to restore state here */ | |
1208 | return 0; | |
1209 | } | |
1210 | #endif /* CONFIG_PM_SLEEP */ | |
1211 | ||
00929447 | 1212 | static const struct virtio_device_id id_table[] = { |
a62a8ef9 SH |
1213 | { VIRTIO_ID_FS, VIRTIO_DEV_ANY_ID }, |
1214 | {}, | |
1215 | }; | |
1216 | ||
00929447 | 1217 | static const unsigned int feature_table[] = {}; |
a62a8ef9 SH |
1218 | |
1219 | static struct virtio_driver virtio_fs_driver = { | |
1220 | .driver.name = KBUILD_MODNAME, | |
a62a8ef9 SH |
1221 | .id_table = id_table, |
1222 | .feature_table = feature_table, | |
1223 | .feature_table_size = ARRAY_SIZE(feature_table), | |
1224 | .probe = virtio_fs_probe, | |
1225 | .remove = virtio_fs_remove, | |
1226 | #ifdef CONFIG_PM_SLEEP | |
1227 | .freeze = virtio_fs_freeze, | |
1228 | .restore = virtio_fs_restore, | |
1229 | #endif | |
1230 | }; | |
1231 | ||
5de8acb4 | 1232 | static void virtio_fs_send_forget(struct fuse_iqueue *fiq, struct fuse_forget_link *link) |
a62a8ef9 | 1233 | { |
a62a8ef9 | 1234 | struct virtio_fs_forget *forget; |
1efcf39e | 1235 | struct virtio_fs_forget_req *req; |
5de8acb4 MS |
1236 | struct virtio_fs *fs = fiq->priv; |
1237 | struct virtio_fs_vq *fsvq = &fs->vqs[VQ_HIPRIO]; | |
1238 | u64 unique = fuse_get_unique(fiq); | |
a62a8ef9 SH |
1239 | |
1240 | /* Allocate a buffer for the request */ | |
1241 | forget = kmalloc(sizeof(*forget), GFP_NOFS | __GFP_NOFAIL); | |
1efcf39e | 1242 | req = &forget->req; |
a62a8ef9 | 1243 | |
1efcf39e | 1244 | req->ih = (struct fuse_in_header){ |
a62a8ef9 SH |
1245 | .opcode = FUSE_FORGET, |
1246 | .nodeid = link->forget_one.nodeid, | |
1247 | .unique = unique, | |
1efcf39e | 1248 | .len = sizeof(*req), |
a62a8ef9 | 1249 | }; |
1efcf39e | 1250 | req->arg = (struct fuse_forget_in){ |
a62a8ef9 SH |
1251 | .nlookup = link->forget_one.nlookup, |
1252 | }; | |
1253 | ||
58ada94f | 1254 | send_forget_request(fsvq, forget, false); |
a62a8ef9 SH |
1255 | kfree(link); |
1256 | } | |
1257 | ||
5de8acb4 | 1258 | static void virtio_fs_send_interrupt(struct fuse_iqueue *fiq, struct fuse_req *req) |
a62a8ef9 SH |
1259 | { |
1260 | /* | |
1261 | * TODO interrupts. | |
1262 | * | |
1263 | * Normal fs operations on a local filesystems aren't interruptible. | |
1264 | * Exceptions are blocking lock operations; for example fcntl(F_SETLKW) | |
1265 | * with shared lock between host and guest. | |
1266 | */ | |
a62a8ef9 SH |
1267 | } |
1268 | ||
42d3e2d0 VG |
1269 | /* Count number of scatter-gather elements required */ |
1270 | static unsigned int sg_count_fuse_pages(struct fuse_page_desc *page_descs, | |
1271 | unsigned int num_pages, | |
1272 | unsigned int total_len) | |
1273 | { | |
1274 | unsigned int i; | |
1275 | unsigned int this_len; | |
1276 | ||
1277 | for (i = 0; i < num_pages && total_len; i++) { | |
1278 | this_len = min(page_descs[i].length, total_len); | |
1279 | total_len -= this_len; | |
1280 | } | |
1281 | ||
1282 | return i; | |
1283 | } | |
1284 | ||
a62a8ef9 SH |
1285 | /* Return the number of scatter-gather list elements required */ |
1286 | static unsigned int sg_count_fuse_req(struct fuse_req *req) | |
1287 | { | |
1288 | struct fuse_args *args = req->args; | |
1289 | struct fuse_args_pages *ap = container_of(args, typeof(*ap), args); | |
42d3e2d0 | 1290 | unsigned int size, total_sgs = 1 /* fuse_in_header */; |
a62a8ef9 SH |
1291 | |
1292 | if (args->in_numargs - args->in_pages) | |
1293 | total_sgs += 1; | |
1294 | ||
42d3e2d0 VG |
1295 | if (args->in_pages) { |
1296 | size = args->in_args[args->in_numargs - 1].size; | |
1297 | total_sgs += sg_count_fuse_pages(ap->descs, ap->num_pages, | |
1298 | size); | |
1299 | } | |
a62a8ef9 SH |
1300 | |
1301 | if (!test_bit(FR_ISREPLY, &req->flags)) | |
1302 | return total_sgs; | |
1303 | ||
1304 | total_sgs += 1 /* fuse_out_header */; | |
1305 | ||
1306 | if (args->out_numargs - args->out_pages) | |
1307 | total_sgs += 1; | |
1308 | ||
42d3e2d0 VG |
1309 | if (args->out_pages) { |
1310 | size = args->out_args[args->out_numargs - 1].size; | |
1311 | total_sgs += sg_count_fuse_pages(ap->descs, ap->num_pages, | |
1312 | size); | |
1313 | } | |
a62a8ef9 SH |
1314 | |
1315 | return total_sgs; | |
1316 | } | |
1317 | ||
1318 | /* Add pages to scatter-gather list and return number of elements used */ | |
1319 | static unsigned int sg_init_fuse_pages(struct scatterlist *sg, | |
1320 | struct page **pages, | |
1321 | struct fuse_page_desc *page_descs, | |
1322 | unsigned int num_pages, | |
1323 | unsigned int total_len) | |
1324 | { | |
1325 | unsigned int i; | |
1326 | unsigned int this_len; | |
1327 | ||
1328 | for (i = 0; i < num_pages && total_len; i++) { | |
1329 | sg_init_table(&sg[i], 1); | |
1330 | this_len = min(page_descs[i].length, total_len); | |
1331 | sg_set_page(&sg[i], pages[i], this_len, page_descs[i].offset); | |
1332 | total_len -= this_len; | |
1333 | } | |
1334 | ||
1335 | return i; | |
1336 | } | |
1337 | ||
1338 | /* Add args to scatter-gather list and return number of elements used */ | |
1339 | static unsigned int sg_init_fuse_args(struct scatterlist *sg, | |
1340 | struct fuse_req *req, | |
1341 | struct fuse_arg *args, | |
1342 | unsigned int numargs, | |
1343 | bool argpages, | |
1344 | void *argbuf, | |
1345 | unsigned int *len_used) | |
1346 | { | |
1347 | struct fuse_args_pages *ap = container_of(req->args, typeof(*ap), args); | |
1348 | unsigned int total_sgs = 0; | |
1349 | unsigned int len; | |
1350 | ||
1351 | len = fuse_len_args(numargs - argpages, args); | |
1352 | if (len) | |
1353 | sg_init_one(&sg[total_sgs++], argbuf, len); | |
1354 | ||
1355 | if (argpages) | |
1356 | total_sgs += sg_init_fuse_pages(&sg[total_sgs], | |
1357 | ap->pages, ap->descs, | |
1358 | ap->num_pages, | |
1359 | args[numargs - 1].size); | |
1360 | ||
1361 | if (len_used) | |
1362 | *len_used = len; | |
1363 | ||
1364 | return total_sgs; | |
1365 | } | |
1366 | ||
1367 | /* Add a request to a virtqueue and kick the device */ | |
1368 | static int virtio_fs_enqueue_req(struct virtio_fs_vq *fsvq, | |
a9bfd9dd | 1369 | struct fuse_req *req, bool in_flight) |
a62a8ef9 SH |
1370 | { |
1371 | /* requests need at least 4 elements */ | |
1372 | struct scatterlist *stack_sgs[6]; | |
1373 | struct scatterlist stack_sg[ARRAY_SIZE(stack_sgs)]; | |
1374 | struct scatterlist **sgs = stack_sgs; | |
1375 | struct scatterlist *sg = stack_sg; | |
1376 | struct virtqueue *vq; | |
1377 | struct fuse_args *args = req->args; | |
1378 | unsigned int argbuf_used = 0; | |
1379 | unsigned int out_sgs = 0; | |
1380 | unsigned int in_sgs = 0; | |
1381 | unsigned int total_sgs; | |
1382 | unsigned int i; | |
1383 | int ret; | |
1384 | bool notify; | |
5dbe190f | 1385 | struct fuse_pqueue *fpq; |
a62a8ef9 SH |
1386 | |
1387 | /* Does the sglist fit on the stack? */ | |
1388 | total_sgs = sg_count_fuse_req(req); | |
1389 | if (total_sgs > ARRAY_SIZE(stack_sgs)) { | |
1390 | sgs = kmalloc_array(total_sgs, sizeof(sgs[0]), GFP_ATOMIC); | |
1391 | sg = kmalloc_array(total_sgs, sizeof(sg[0]), GFP_ATOMIC); | |
1392 | if (!sgs || !sg) { | |
1393 | ret = -ENOMEM; | |
1394 | goto out; | |
1395 | } | |
1396 | } | |
1397 | ||
1398 | /* Use a bounce buffer since stack args cannot be mapped */ | |
1399 | ret = copy_args_to_argbuf(req); | |
1400 | if (ret < 0) | |
1401 | goto out; | |
1402 | ||
1403 | /* Request elements */ | |
1404 | sg_init_one(&sg[out_sgs++], &req->in.h, sizeof(req->in.h)); | |
1405 | out_sgs += sg_init_fuse_args(&sg[out_sgs], req, | |
1406 | (struct fuse_arg *)args->in_args, | |
1407 | args->in_numargs, args->in_pages, | |
1408 | req->argbuf, &argbuf_used); | |
1409 | ||
1410 | /* Reply elements */ | |
1411 | if (test_bit(FR_ISREPLY, &req->flags)) { | |
1412 | sg_init_one(&sg[out_sgs + in_sgs++], | |
1413 | &req->out.h, sizeof(req->out.h)); | |
1414 | in_sgs += sg_init_fuse_args(&sg[out_sgs + in_sgs], req, | |
1415 | args->out_args, args->out_numargs, | |
1416 | args->out_pages, | |
1417 | req->argbuf + argbuf_used, NULL); | |
1418 | } | |
1419 | ||
1420 | WARN_ON(out_sgs + in_sgs != total_sgs); | |
1421 | ||
1422 | for (i = 0; i < total_sgs; i++) | |
1423 | sgs[i] = &sg[i]; | |
1424 | ||
1425 | spin_lock(&fsvq->lock); | |
1426 | ||
1427 | if (!fsvq->connected) { | |
1428 | spin_unlock(&fsvq->lock); | |
1429 | ret = -ENOTCONN; | |
1430 | goto out; | |
1431 | } | |
1432 | ||
1433 | vq = fsvq->vq; | |
1434 | ret = virtqueue_add_sgs(vq, sgs, out_sgs, in_sgs, req, GFP_ATOMIC); | |
1435 | if (ret < 0) { | |
1436 | spin_unlock(&fsvq->lock); | |
1437 | goto out; | |
1438 | } | |
1439 | ||
5dbe190f VG |
1440 | /* Request successfully sent. */ |
1441 | fpq = &fsvq->fud->pq; | |
1442 | spin_lock(&fpq->lock); | |
1443 | list_add_tail(&req->list, fpq->processing); | |
1444 | spin_unlock(&fpq->lock); | |
1445 | set_bit(FR_SENT, &req->flags); | |
1446 | /* matches barrier in request_wait_answer() */ | |
1447 | smp_mb__after_atomic(); | |
1448 | ||
a9bfd9dd VG |
1449 | if (!in_flight) |
1450 | inc_in_flight_req(fsvq); | |
a62a8ef9 SH |
1451 | notify = virtqueue_kick_prepare(vq); |
1452 | ||
1453 | spin_unlock(&fsvq->lock); | |
1454 | ||
1455 | if (notify) | |
1456 | virtqueue_notify(vq); | |
1457 | ||
1458 | out: | |
1459 | if (ret < 0 && req->argbuf) { | |
1460 | kfree(req->argbuf); | |
1461 | req->argbuf = NULL; | |
1462 | } | |
1463 | if (sgs != stack_sgs) { | |
1464 | kfree(sgs); | |
1465 | kfree(sg); | |
1466 | } | |
1467 | ||
1468 | return ret; | |
1469 | } | |
1470 | ||
5de8acb4 | 1471 | static void virtio_fs_send_req(struct fuse_iqueue *fiq, struct fuse_req *req) |
a62a8ef9 | 1472 | { |
529395d2 | 1473 | unsigned int queue_id; |
a62a8ef9 | 1474 | struct virtio_fs *fs; |
51fecdd2 | 1475 | struct virtio_fs_vq *fsvq; |
a62a8ef9 SH |
1476 | int ret; |
1477 | ||
5de8acb4 MS |
1478 | if (req->in.h.opcode != FUSE_NOTIFY_REPLY) |
1479 | req->in.h.unique = fuse_get_unique(fiq); | |
1480 | ||
a62a8ef9 | 1481 | clear_bit(FR_PENDING, &req->flags); |
a62a8ef9 SH |
1482 | |
1483 | fs = fiq->priv; | |
529395d2 | 1484 | queue_id = VQ_REQUEST + fs->mq_map[raw_smp_processor_id()]; |
a62a8ef9 | 1485 | |
529395d2 PJG |
1486 | pr_debug("%s: opcode %u unique %#llx nodeid %#llx in.len %u out.len %u queue_id %u\n", |
1487 | __func__, req->in.h.opcode, req->in.h.unique, | |
a62a8ef9 | 1488 | req->in.h.nodeid, req->in.h.len, |
529395d2 PJG |
1489 | fuse_len_args(req->args->out_numargs, req->args->out_args), |
1490 | queue_id); | |
a62a8ef9 | 1491 | |
51fecdd2 | 1492 | fsvq = &fs->vqs[queue_id]; |
a9bfd9dd | 1493 | ret = virtio_fs_enqueue_req(fsvq, req, false); |
a62a8ef9 | 1494 | if (ret < 0) { |
2106e1f4 | 1495 | if (ret == -ENOSPC) { |
a9bfd9dd VG |
1496 | /* |
1497 | * Virtqueue full. Retry submission from worker | |
1498 | * context as we might be holding fc->bg_lock. | |
1499 | */ | |
1500 | spin_lock(&fsvq->lock); | |
1501 | list_add_tail(&req->list, &fsvq->queued_reqs); | |
1502 | inc_in_flight_req(fsvq); | |
a9bfd9dd VG |
1503 | spin_unlock(&fsvq->lock); |
1504 | return; | |
a62a8ef9 SH |
1505 | } |
1506 | req->out.h.error = ret; | |
1507 | pr_err("virtio-fs: virtio_fs_enqueue_req() failed %d\n", ret); | |
51fecdd2 VG |
1508 | |
1509 | /* Can't end request in submission context. Use a worker */ | |
1510 | spin_lock(&fsvq->lock); | |
1511 | list_add_tail(&req->list, &fsvq->end_reqs); | |
106e4df1 | 1512 | schedule_work(&fsvq->dispatch_work); |
51fecdd2 | 1513 | spin_unlock(&fsvq->lock); |
a62a8ef9 SH |
1514 | return; |
1515 | } | |
1516 | } | |
1517 | ||
00929447 | 1518 | static const struct fuse_iqueue_ops virtio_fs_fiq_ops = { |
5de8acb4 MS |
1519 | .send_forget = virtio_fs_send_forget, |
1520 | .send_interrupt = virtio_fs_send_interrupt, | |
1521 | .send_req = virtio_fs_send_req, | |
1522 | .release = virtio_fs_fiq_release, | |
a62a8ef9 SH |
1523 | }; |
1524 | ||
1dd53957 | 1525 | static inline void virtio_fs_ctx_set_defaults(struct fuse_fs_context *ctx) |
a62a8ef9 | 1526 | { |
1dd53957 VG |
1527 | ctx->rootmode = S_IFDIR; |
1528 | ctx->default_permissions = 1; | |
1529 | ctx->allow_other = 1; | |
1530 | ctx->max_read = UINT_MAX; | |
1531 | ctx->blksize = 512; | |
1532 | ctx->destroy = true; | |
1533 | ctx->no_control = true; | |
1534 | ctx->no_force_umount = true; | |
1535 | } | |
1536 | ||
1537 | static int virtio_fs_fill_super(struct super_block *sb, struct fs_context *fsc) | |
a62a8ef9 | 1538 | { |
fcee216b MR |
1539 | struct fuse_mount *fm = get_fuse_mount_super(sb); |
1540 | struct fuse_conn *fc = fm->fc; | |
a62a8ef9 | 1541 | struct virtio_fs *fs = fc->iq.priv; |
1dd53957 | 1542 | struct fuse_fs_context *ctx = fsc->fs_private; |
a62a8ef9 SH |
1543 | unsigned int i; |
1544 | int err; | |
a62a8ef9 | 1545 | |
1dd53957 | 1546 | virtio_fs_ctx_set_defaults(ctx); |
a62a8ef9 SH |
1547 | mutex_lock(&virtio_fs_mutex); |
1548 | ||
1549 | /* After holding mutex, make sure virtiofs device is still there. | |
1550 | * Though we are holding a reference to it, drive ->remove might | |
1551 | * still have cleaned up virtual queues. In that case bail out. | |
1552 | */ | |
1553 | err = -EINVAL; | |
1554 | if (list_empty(&fs->list)) { | |
1555 | pr_info("virtio-fs: tag <%s> not found\n", fs->tag); | |
1556 | goto err; | |
1557 | } | |
1558 | ||
1559 | err = -ENOMEM; | |
1560 | /* Allocate fuse_dev for hiprio and notification queues */ | |
7fd3abfa | 1561 | for (i = 0; i < fs->nvqs; i++) { |
a62a8ef9 SH |
1562 | struct virtio_fs_vq *fsvq = &fs->vqs[i]; |
1563 | ||
1564 | fsvq->fud = fuse_dev_alloc(); | |
1565 | if (!fsvq->fud) | |
1566 | goto err_free_fuse_devs; | |
1567 | } | |
1568 | ||
7fd3abfa | 1569 | /* virtiofs allocates and installs its own fuse devices */ |
1dd53957 | 1570 | ctx->fudptr = NULL; |
780b1b95 JX |
1571 | if (ctx->dax_mode != FUSE_DAX_NEVER) { |
1572 | if (ctx->dax_mode == FUSE_DAX_ALWAYS && !fs->dax_dev) { | |
3f9b9efd VG |
1573 | err = -EINVAL; |
1574 | pr_err("virtio-fs: dax can't be enabled as filesystem" | |
1575 | " device does not support it.\n"); | |
1576 | goto err_free_fuse_devs; | |
1577 | } | |
1dd53957 | 1578 | ctx->dax_dev = fs->dax_dev; |
3f9b9efd | 1579 | } |
1dd53957 | 1580 | err = fuse_fill_super_common(sb, ctx); |
a62a8ef9 SH |
1581 | if (err < 0) |
1582 | goto err_free_fuse_devs; | |
1583 | ||
a62a8ef9 SH |
1584 | for (i = 0; i < fs->nvqs; i++) { |
1585 | struct virtio_fs_vq *fsvq = &fs->vqs[i]; | |
1586 | ||
a62a8ef9 SH |
1587 | fuse_dev_install(fsvq->fud, fc); |
1588 | } | |
1589 | ||
1590 | /* Previous unmount will stop all queues. Start these again */ | |
1591 | virtio_fs_start_all_queues(fs); | |
fcee216b | 1592 | fuse_send_init(fm); |
a62a8ef9 SH |
1593 | mutex_unlock(&virtio_fs_mutex); |
1594 | return 0; | |
1595 | ||
1596 | err_free_fuse_devs: | |
1597 | virtio_fs_free_devs(fs); | |
1598 | err: | |
1599 | mutex_unlock(&virtio_fs_mutex); | |
1600 | return err; | |
1601 | } | |
1602 | ||
fcee216b | 1603 | static void virtio_fs_conn_destroy(struct fuse_mount *fm) |
a62a8ef9 | 1604 | { |
fcee216b MR |
1605 | struct fuse_conn *fc = fm->fc; |
1606 | struct virtio_fs *vfs = fc->iq.priv; | |
1607 | struct virtio_fs_vq *fsvq = &vfs->vqs[VQ_HIPRIO]; | |
a62a8ef9 | 1608 | |
fcee216b MR |
1609 | /* Stop dax worker. Soon evict_inodes() will be called which |
1610 | * will free all memory ranges belonging to all inodes. | |
9a752d18 VG |
1611 | */ |
1612 | if (IS_ENABLED(CONFIG_FUSE_DAX)) | |
1613 | fuse_dax_cancel_work(fc); | |
a62a8ef9 SH |
1614 | |
1615 | /* Stop forget queue. Soon destroy will be sent */ | |
1616 | spin_lock(&fsvq->lock); | |
1617 | fsvq->connected = false; | |
1618 | spin_unlock(&fsvq->lock); | |
1619 | virtio_fs_drain_all_queues(vfs); | |
1620 | ||
fcee216b | 1621 | fuse_conn_destroy(fm); |
a62a8ef9 | 1622 | |
fcee216b | 1623 | /* fuse_conn_destroy() must have sent destroy. Stop all queues |
a62a8ef9 SH |
1624 | * and drain one more time and free fuse devices. Freeing fuse |
1625 | * devices will drop their reference on fuse_conn and that in | |
1626 | * turn will drop its reference on virtio_fs object. | |
1627 | */ | |
1628 | virtio_fs_stop_all_queues(vfs); | |
1629 | virtio_fs_drain_all_queues(vfs); | |
1630 | virtio_fs_free_devs(vfs); | |
1631 | } | |
1632 | ||
fcee216b MR |
1633 | static void virtio_kill_sb(struct super_block *sb) |
1634 | { | |
1635 | struct fuse_mount *fm = get_fuse_mount_super(sb); | |
1636 | bool last; | |
1637 | ||
1638 | /* If mount failed, we can still be called without any fc */ | |
d534d31d | 1639 | if (sb->s_root) { |
fcee216b MR |
1640 | last = fuse_mount_remove(fm); |
1641 | if (last) | |
1642 | virtio_fs_conn_destroy(fm); | |
1643 | } | |
1644 | kill_anon_super(sb); | |
a27c061a | 1645 | fuse_mount_destroy(fm); |
fcee216b MR |
1646 | } |
1647 | ||
a62a8ef9 SH |
1648 | static int virtio_fs_test_super(struct super_block *sb, |
1649 | struct fs_context *fsc) | |
1650 | { | |
fcee216b MR |
1651 | struct fuse_mount *fsc_fm = fsc->s_fs_info; |
1652 | struct fuse_mount *sb_fm = get_fuse_mount_super(sb); | |
a62a8ef9 | 1653 | |
fcee216b | 1654 | return fsc_fm->fc->iq.priv == sb_fm->fc->iq.priv; |
a62a8ef9 SH |
1655 | } |
1656 | ||
a62a8ef9 SH |
1657 | static int virtio_fs_get_tree(struct fs_context *fsc) |
1658 | { | |
1659 | struct virtio_fs *fs; | |
1660 | struct super_block *sb; | |
a7f0d7aa | 1661 | struct fuse_conn *fc = NULL; |
fcee216b | 1662 | struct fuse_mount *fm; |
a7f0d7aa CK |
1663 | unsigned int virtqueue_size; |
1664 | int err = -EIO; | |
a62a8ef9 SH |
1665 | |
1666 | /* This gets a reference on virtio_fs object. This ptr gets installed | |
1667 | * in fc->iq->priv. Once fuse_conn is going away, it calls ->put() | |
1668 | * to drop the reference to this object. | |
1669 | */ | |
1670 | fs = virtio_fs_find_instance(fsc->source); | |
1671 | if (!fs) { | |
1672 | pr_info("virtio-fs: tag <%s> not found\n", fsc->source); | |
1673 | return -EINVAL; | |
1674 | } | |
1675 | ||
a7f0d7aa CK |
1676 | virtqueue_size = virtqueue_get_vring_size(fs->vqs[VQ_REQUEST].vq); |
1677 | if (WARN_ON(virtqueue_size <= FUSE_HEADER_OVERHEAD)) | |
1678 | goto out_err; | |
1679 | ||
833c5a42 | 1680 | err = -ENOMEM; |
a62a8ef9 | 1681 | fc = kzalloc(sizeof(struct fuse_conn), GFP_KERNEL); |
833c5a42 MS |
1682 | if (!fc) |
1683 | goto out_err; | |
a62a8ef9 | 1684 | |
fcee216b | 1685 | fm = kzalloc(sizeof(struct fuse_mount), GFP_KERNEL); |
833c5a42 MS |
1686 | if (!fm) |
1687 | goto out_err; | |
fcee216b | 1688 | |
0a7419c6 | 1689 | fuse_conn_init(fc, fm, fsc->user_ns, &virtio_fs_fiq_ops, fs); |
a62a8ef9 SH |
1690 | fc->release = fuse_free_conn; |
1691 | fc->delete_stale = true; | |
bf109c64 | 1692 | fc->auto_submounts = true; |
2d82ab25 | 1693 | fc->sync_fs = true; |
a62a8ef9 | 1694 | |
a7f0d7aa CK |
1695 | /* Tell FUSE to split requests that exceed the virtqueue's size */ |
1696 | fc->max_pages_limit = min_t(unsigned int, fc->max_pages_limit, | |
1697 | virtqueue_size - FUSE_HEADER_OVERHEAD); | |
1698 | ||
fcee216b | 1699 | fsc->s_fs_info = fm; |
b19d3d00 | 1700 | sb = sget_fc(fsc, virtio_fs_test_super, set_anon_super_fc); |
c191cd07 MS |
1701 | if (fsc->s_fs_info) |
1702 | fuse_mount_destroy(fm); | |
a62a8ef9 SH |
1703 | if (IS_ERR(sb)) |
1704 | return PTR_ERR(sb); | |
1705 | ||
1706 | if (!sb->s_root) { | |
1dd53957 | 1707 | err = virtio_fs_fill_super(sb, fsc); |
a62a8ef9 SH |
1708 | if (err) { |
1709 | deactivate_locked_super(sb); | |
1710 | return err; | |
1711 | } | |
1712 | ||
1713 | sb->s_flags |= SB_ACTIVE; | |
1714 | } | |
1715 | ||
1716 | WARN_ON(fsc->root); | |
1717 | fsc->root = dget(sb->s_root); | |
1718 | return 0; | |
833c5a42 MS |
1719 | |
1720 | out_err: | |
1721 | kfree(fc); | |
833c5a42 | 1722 | virtio_fs_put(fs); |
833c5a42 | 1723 | return err; |
a62a8ef9 SH |
1724 | } |
1725 | ||
1726 | static const struct fs_context_operations virtio_fs_context_ops = { | |
84c21507 | 1727 | .free = virtio_fs_free_fsc, |
1dd53957 | 1728 | .parse_param = virtio_fs_parse_param, |
a62a8ef9 SH |
1729 | .get_tree = virtio_fs_get_tree, |
1730 | }; | |
1731 | ||
1732 | static int virtio_fs_init_fs_context(struct fs_context *fsc) | |
1733 | { | |
1dd53957 VG |
1734 | struct fuse_fs_context *ctx; |
1735 | ||
fe0a7bd8 GK |
1736 | if (fsc->purpose == FS_CONTEXT_FOR_SUBMOUNT) |
1737 | return fuse_init_fs_context_submount(fsc); | |
1738 | ||
1dd53957 VG |
1739 | ctx = kzalloc(sizeof(struct fuse_fs_context), GFP_KERNEL); |
1740 | if (!ctx) | |
1741 | return -ENOMEM; | |
1742 | fsc->fs_private = ctx; | |
a62a8ef9 SH |
1743 | fsc->ops = &virtio_fs_context_ops; |
1744 | return 0; | |
1745 | } | |
1746 | ||
1747 | static struct file_system_type virtio_fs_type = { | |
1748 | .owner = THIS_MODULE, | |
1749 | .name = "virtiofs", | |
1750 | .init_fs_context = virtio_fs_init_fs_context, | |
1751 | .kill_sb = virtio_kill_sb, | |
862b9a8e | 1752 | .fs_flags = FS_ALLOW_IDMAP, |
a62a8ef9 SH |
1753 | }; |
1754 | ||
9086b2d9 SH |
1755 | static int virtio_fs_uevent(const struct kobject *kobj, struct kobj_uevent_env *env) |
1756 | { | |
1757 | const struct virtio_fs *fs = container_of(kobj, struct virtio_fs, kobj); | |
1758 | ||
1759 | add_uevent_var(env, "TAG=%s", fs->tag); | |
1760 | return 0; | |
1761 | } | |
1762 | ||
1763 | static const struct kset_uevent_ops virtio_fs_uevent_ops = { | |
1764 | .uevent = virtio_fs_uevent, | |
1765 | }; | |
1766 | ||
a8f62f50 SH |
1767 | static int __init virtio_fs_sysfs_init(void) |
1768 | { | |
9086b2d9 SH |
1769 | virtio_fs_kset = kset_create_and_add("virtiofs", &virtio_fs_uevent_ops, |
1770 | fs_kobj); | |
a8f62f50 SH |
1771 | if (!virtio_fs_kset) |
1772 | return -ENOMEM; | |
1773 | return 0; | |
1774 | } | |
1775 | ||
d30ff898 | 1776 | static void virtio_fs_sysfs_exit(void) |
a8f62f50 SH |
1777 | { |
1778 | kset_unregister(virtio_fs_kset); | |
1779 | virtio_fs_kset = NULL; | |
1780 | } | |
1781 | ||
a62a8ef9 SH |
1782 | static int __init virtio_fs_init(void) |
1783 | { | |
1784 | int ret; | |
1785 | ||
a8f62f50 | 1786 | ret = virtio_fs_sysfs_init(); |
a62a8ef9 SH |
1787 | if (ret < 0) |
1788 | return ret; | |
1789 | ||
a8f62f50 SH |
1790 | ret = register_virtio_driver(&virtio_fs_driver); |
1791 | if (ret < 0) | |
1792 | goto sysfs_exit; | |
1793 | ||
a62a8ef9 | 1794 | ret = register_filesystem(&virtio_fs_type); |
a8f62f50 SH |
1795 | if (ret < 0) |
1796 | goto unregister_virtio_driver; | |
a62a8ef9 SH |
1797 | |
1798 | return 0; | |
a8f62f50 SH |
1799 | |
1800 | unregister_virtio_driver: | |
1801 | unregister_virtio_driver(&virtio_fs_driver); | |
1802 | sysfs_exit: | |
1803 | virtio_fs_sysfs_exit(); | |
1804 | return ret; | |
a62a8ef9 SH |
1805 | } |
1806 | module_init(virtio_fs_init); | |
1807 | ||
1808 | static void __exit virtio_fs_exit(void) | |
1809 | { | |
1810 | unregister_filesystem(&virtio_fs_type); | |
1811 | unregister_virtio_driver(&virtio_fs_driver); | |
a8f62f50 | 1812 | virtio_fs_sysfs_exit(); |
a62a8ef9 SH |
1813 | } |
1814 | module_exit(virtio_fs_exit); | |
1815 | ||
1816 | MODULE_AUTHOR("Stefan Hajnoczi <stefanha@redhat.com>"); | |
1817 | MODULE_DESCRIPTION("Virtio Filesystem"); | |
1818 | MODULE_LICENSE("GPL"); | |
1819 | MODULE_ALIAS_FS(KBUILD_MODNAME); | |
1820 | MODULE_DEVICE_TABLE(virtio, id_table); |