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29b24f6c | 1 | // SPDX-License-Identifier: GPL-2.0-only |
02827e17 | 2 | /* |
02827e17 GX |
3 | * Copyright (C) 2018 HUAWEI, Inc. |
4 | * http://www.huawei.com/ | |
5 | * Created by Gao Xiang <gaoxiang25@huawei.com> | |
02827e17 | 6 | */ |
57b78c9f | 7 | #include "zdata.h" |
27481233 | 8 | #include "compress.h" |
3883a79a GX |
9 | #include <linux/prefetch.h> |
10 | ||
284db12c CG |
11 | #include <trace/events/erofs.h> |
12 | ||
672e5476 GX |
13 | /* |
14 | * a compressed_pages[] placeholder in order to avoid | |
15 | * being filled with file pages for in-place decompression. | |
16 | */ | |
17 | #define PAGE_UNALLOCATED ((void *)0x5F0E4B1D) | |
18 | ||
97e86a85 | 19 | /* how to allocate cached pages for a pcluster */ |
92e6efd5 GX |
20 | enum z_erofs_cache_alloctype { |
21 | DONTALLOC, /* don't allocate any cached pages */ | |
22 | DELAYEDALLOC, /* delayed allocation (at the time of submitting io) */ | |
23 | }; | |
24 | ||
25 | /* | |
26 | * tagged pointer with 1-bit tag for all compressed pages | |
27 | * tag 0 - the page is just found with an extra page reference | |
28 | */ | |
29 | typedef tagptr1_t compressed_page_t; | |
30 | ||
31 | #define tag_compressed_page_justfound(page) \ | |
32 | tagptr_fold(compressed_page_t, page, 1) | |
33 | ||
3883a79a | 34 | static struct workqueue_struct *z_erofs_workqueue __read_mostly; |
97e86a85 | 35 | static struct kmem_cache *pcluster_cachep __read_mostly; |
3883a79a GX |
36 | |
37 | void z_erofs_exit_zip_subsystem(void) | |
38 | { | |
3883a79a | 39 | destroy_workqueue(z_erofs_workqueue); |
97e86a85 | 40 | kmem_cache_destroy(pcluster_cachep); |
3883a79a GX |
41 | } |
42 | ||
99634bf3 | 43 | static inline int z_erofs_init_workqueue(void) |
3883a79a | 44 | { |
7dd68b14 | 45 | const unsigned int onlinecpus = num_possible_cpus(); |
97e86a85 | 46 | const unsigned int flags = WQ_UNBOUND | WQ_HIGHPRI | WQ_CPU_INTENSIVE; |
3883a79a GX |
47 | |
48 | /* | |
97e86a85 GX |
49 | * no need to spawn too many threads, limiting threads could minimum |
50 | * scheduling overhead, perhaps per-CPU threads should be better? | |
3883a79a | 51 | */ |
97e86a85 GX |
52 | z_erofs_workqueue = alloc_workqueue("erofs_unzipd", flags, |
53 | onlinecpus + onlinecpus / 4); | |
42d40b4a | 54 | return z_erofs_workqueue ? 0 : -ENOMEM; |
3883a79a GX |
55 | } |
56 | ||
99634bf3 | 57 | static void z_erofs_pcluster_init_once(void *ptr) |
48d4bf3b | 58 | { |
97e86a85 GX |
59 | struct z_erofs_pcluster *pcl = ptr; |
60 | struct z_erofs_collection *cl = z_erofs_primarycollection(pcl); | |
48d4bf3b GX |
61 | unsigned int i; |
62 | ||
97e86a85 GX |
63 | mutex_init(&cl->lock); |
64 | cl->nr_pages = 0; | |
65 | cl->vcnt = 0; | |
48d4bf3b | 66 | for (i = 0; i < Z_EROFS_CLUSTER_MAX_PAGES; ++i) |
97e86a85 | 67 | pcl->compressed_pages[i] = NULL; |
48d4bf3b GX |
68 | } |
69 | ||
99634bf3 | 70 | static void z_erofs_pcluster_init_always(struct z_erofs_pcluster *pcl) |
48d4bf3b | 71 | { |
97e86a85 | 72 | struct z_erofs_collection *cl = z_erofs_primarycollection(pcl); |
48d4bf3b | 73 | |
97e86a85 | 74 | atomic_set(&pcl->obj.refcount, 1); |
48d4bf3b | 75 | |
97e86a85 GX |
76 | DBG_BUGON(cl->nr_pages); |
77 | DBG_BUGON(cl->vcnt); | |
48d4bf3b GX |
78 | } |
79 | ||
0a0b7e62 | 80 | int __init z_erofs_init_zip_subsystem(void) |
3883a79a | 81 | { |
97e86a85 GX |
82 | pcluster_cachep = kmem_cache_create("erofs_compress", |
83 | Z_EROFS_WORKGROUP_SIZE, 0, | |
99634bf3 GX |
84 | SLAB_RECLAIM_ACCOUNT, |
85 | z_erofs_pcluster_init_once); | |
97e86a85 | 86 | if (pcluster_cachep) { |
99634bf3 | 87 | if (!z_erofs_init_workqueue()) |
3883a79a GX |
88 | return 0; |
89 | ||
97e86a85 | 90 | kmem_cache_destroy(pcluster_cachep); |
3883a79a GX |
91 | } |
92 | return -ENOMEM; | |
93 | } | |
94 | ||
97e86a85 GX |
95 | enum z_erofs_collectmode { |
96 | COLLECT_SECONDARY, | |
97 | COLLECT_PRIMARY, | |
3883a79a | 98 | /* |
97e86a85 GX |
99 | * The current collection was the tail of an exist chain, in addition |
100 | * that the previous processed chained collections are all decided to | |
101 | * be hooked up to it. | |
102 | * A new chain will be created for the remaining collections which are | |
103 | * not processed yet, therefore different from COLLECT_PRIMARY_FOLLOWED, | |
104 | * the next collection cannot reuse the whole page safely in | |
105 | * the following scenario: | |
a112152f GX |
106 | * ________________________________________________________________ |
107 | * | tail (partial) page | head (partial) page | | |
97e86a85 | 108 | * | (belongs to the next cl) | (belongs to the current cl) | |
a112152f GX |
109 | * |_______PRIMARY_FOLLOWED_______|________PRIMARY_HOOKED___________| |
110 | */ | |
97e86a85 GX |
111 | COLLECT_PRIMARY_HOOKED, |
112 | COLLECT_PRIMARY_FOLLOWED_NOINPLACE, | |
a112152f | 113 | /* |
97e86a85 GX |
114 | * The current collection has been linked with the owned chain, and |
115 | * could also be linked with the remaining collections, which means | |
116 | * if the processing page is the tail page of the collection, thus | |
117 | * the current collection can safely use the whole page (since | |
118 | * the previous collection is under control) for in-place I/O, as | |
119 | * illustrated below: | |
a112152f | 120 | * ________________________________________________________________ |
97e86a85 GX |
121 | * | tail (partial) page | head (partial) page | |
122 | * | (of the current cl) | (of the previous collection) | | |
123 | * | PRIMARY_FOLLOWED or | | | |
124 | * |_____PRIMARY_HOOKED___|____________PRIMARY_FOLLOWED____________| | |
a112152f | 125 | * |
97e86a85 | 126 | * [ (*) the above page can be used as inplace I/O. ] |
3883a79a | 127 | */ |
97e86a85 | 128 | COLLECT_PRIMARY_FOLLOWED, |
3883a79a GX |
129 | }; |
130 | ||
97e86a85 | 131 | struct z_erofs_collector { |
3883a79a GX |
132 | struct z_erofs_pagevec_ctor vector; |
133 | ||
bfc4ccb1 | 134 | struct z_erofs_pcluster *pcl, *tailpcl; |
97e86a85 GX |
135 | struct z_erofs_collection *cl; |
136 | struct page **compressedpages; | |
137 | z_erofs_next_pcluster_t owned_head; | |
138 | ||
139 | enum z_erofs_collectmode mode; | |
3883a79a GX |
140 | }; |
141 | ||
97e86a85 GX |
142 | struct z_erofs_decompress_frontend { |
143 | struct inode *const inode; | |
144 | ||
145 | struct z_erofs_collector clt; | |
146 | struct erofs_map_blocks map; | |
147 | ||
148 | /* used for applying cache strategy on the fly */ | |
149 | bool backmost; | |
150 | erofs_off_t headoffset; | |
151 | }; | |
152 | ||
153 | #define COLLECTOR_INIT() { \ | |
154 | .owned_head = Z_EROFS_PCLUSTER_TAIL, \ | |
155 | .mode = COLLECT_PRIMARY_FOLLOWED } | |
156 | ||
157 | #define DECOMPRESS_FRONTEND_INIT(__i) { \ | |
158 | .inode = __i, .clt = COLLECTOR_INIT(), \ | |
159 | .backmost = true, } | |
160 | ||
161 | static struct page *z_pagemap_global[Z_EROFS_VMAP_GLOBAL_PAGES]; | |
162 | static DEFINE_MUTEX(z_pagemap_global_lock); | |
3883a79a | 163 | |
97e86a85 | 164 | static void preload_compressed_pages(struct z_erofs_collector *clt, |
92e6efd5 | 165 | struct address_space *mc, |
92e6efd5 | 166 | enum z_erofs_cache_alloctype type, |
97e86a85 | 167 | struct list_head *pagepool) |
105d4ad8 | 168 | { |
97e86a85 GX |
169 | const struct z_erofs_pcluster *pcl = clt->pcl; |
170 | const unsigned int clusterpages = BIT(pcl->clusterbits); | |
171 | struct page **pages = clt->compressedpages; | |
172 | pgoff_t index = pcl->obj.index + (pages - pcl->compressed_pages); | |
92e6efd5 | 173 | bool standalone = true; |
92e6efd5 | 174 | |
97e86a85 | 175 | if (clt->mode < COLLECT_PRIMARY_FOLLOWED) |
92e6efd5 GX |
176 | return; |
177 | ||
97e86a85 | 178 | for (; pages < pcl->compressed_pages + clusterpages; ++pages) { |
92e6efd5 GX |
179 | struct page *page; |
180 | compressed_page_t t; | |
181 | ||
182 | /* the compressed page was loaded before */ | |
97e86a85 | 183 | if (READ_ONCE(*pages)) |
105d4ad8 GX |
184 | continue; |
185 | ||
97e86a85 | 186 | page = find_get_page(mc, index); |
92e6efd5 GX |
187 | |
188 | if (page) { | |
189 | t = tag_compressed_page_justfound(page); | |
190 | } else if (type == DELAYEDALLOC) { | |
191 | t = tagptr_init(compressed_page_t, PAGE_UNALLOCATED); | |
192 | } else { /* DONTALLOC */ | |
193 | if (standalone) | |
97e86a85 | 194 | clt->compressedpages = pages; |
92e6efd5 GX |
195 | standalone = false; |
196 | continue; | |
105d4ad8 GX |
197 | } |
198 | ||
97e86a85 | 199 | if (!cmpxchg_relaxed(pages, NULL, tagptr_cast_ptr(t))) |
105d4ad8 GX |
200 | continue; |
201 | ||
92e6efd5 GX |
202 | if (page) |
203 | put_page(page); | |
105d4ad8 | 204 | } |
92e6efd5 | 205 | |
97e86a85 GX |
206 | if (standalone) /* downgrade to PRIMARY_FOLLOWED_NOINPLACE */ |
207 | clt->mode = COLLECT_PRIMARY_FOLLOWED_NOINPLACE; | |
105d4ad8 GX |
208 | } |
209 | ||
210 | /* called by erofs_shrinker to get rid of all compressed_pages */ | |
47e541a1 | 211 | int erofs_try_to_free_all_cached_pages(struct erofs_sb_info *sbi, |
97e86a85 | 212 | struct erofs_workgroup *grp) |
105d4ad8 | 213 | { |
97e86a85 GX |
214 | struct z_erofs_pcluster *const pcl = |
215 | container_of(grp, struct z_erofs_pcluster, obj); | |
c1448fa8 | 216 | struct address_space *const mapping = MNGD_MAPPING(sbi); |
97e86a85 | 217 | const unsigned int clusterpages = BIT(pcl->clusterbits); |
105d4ad8 GX |
218 | int i; |
219 | ||
220 | /* | |
221 | * refcount of workgroup is now freezed as 1, | |
222 | * therefore no need to worry about available decompression users. | |
223 | */ | |
224 | for (i = 0; i < clusterpages; ++i) { | |
97e86a85 | 225 | struct page *page = pcl->compressed_pages[i]; |
105d4ad8 | 226 | |
97e86a85 | 227 | if (!page) |
105d4ad8 GX |
228 | continue; |
229 | ||
230 | /* block other users from reclaiming or migrating the page */ | |
231 | if (!trylock_page(page)) | |
232 | return -EBUSY; | |
233 | ||
8d8a09b0 | 234 | if (page->mapping != mapping) |
97e86a85 | 235 | continue; |
105d4ad8 | 236 | |
97e86a85 GX |
237 | /* barrier is implied in the following 'unlock_page' */ |
238 | WRITE_ONCE(pcl->compressed_pages[i], NULL); | |
105d4ad8 GX |
239 | set_page_private(page, 0); |
240 | ClearPagePrivate(page); | |
241 | ||
242 | unlock_page(page); | |
243 | put_page(page); | |
244 | } | |
245 | return 0; | |
246 | } | |
247 | ||
47e541a1 GX |
248 | int erofs_try_to_free_cached_page(struct address_space *mapping, |
249 | struct page *page) | |
105d4ad8 | 250 | { |
97e86a85 GX |
251 | struct z_erofs_pcluster *const pcl = (void *)page_private(page); |
252 | const unsigned int clusterpages = BIT(pcl->clusterbits); | |
105d4ad8 GX |
253 | int ret = 0; /* 0 - busy */ |
254 | ||
97e86a85 | 255 | if (erofs_workgroup_try_to_freeze(&pcl->obj, 1)) { |
105d4ad8 GX |
256 | unsigned int i; |
257 | ||
258 | for (i = 0; i < clusterpages; ++i) { | |
97e86a85 GX |
259 | if (pcl->compressed_pages[i] == page) { |
260 | WRITE_ONCE(pcl->compressed_pages[i], NULL); | |
105d4ad8 GX |
261 | ret = 1; |
262 | break; | |
263 | } | |
264 | } | |
97e86a85 | 265 | erofs_workgroup_unfreeze(&pcl->obj, 1); |
105d4ad8 | 266 | |
047d4abc GX |
267 | if (ret) { |
268 | ClearPagePrivate(page); | |
269 | put_page(page); | |
270 | } | |
105d4ad8 GX |
271 | } |
272 | return ret; | |
273 | } | |
105d4ad8 | 274 | |
3883a79a | 275 | /* page_type must be Z_EROFS_PAGE_TYPE_EXCLUSIVE */ |
99634bf3 GX |
276 | static inline bool z_erofs_try_inplace_io(struct z_erofs_collector *clt, |
277 | struct page *page) | |
3883a79a | 278 | { |
97e86a85 GX |
279 | struct z_erofs_pcluster *const pcl = clt->pcl; |
280 | const unsigned int clusterpages = BIT(pcl->clusterbits); | |
281 | ||
282 | while (clt->compressedpages < pcl->compressed_pages + clusterpages) { | |
283 | if (!cmpxchg(clt->compressedpages++, NULL, page)) | |
3883a79a GX |
284 | return true; |
285 | } | |
3883a79a GX |
286 | return false; |
287 | } | |
288 | ||
97e86a85 GX |
289 | /* callers must be with collection lock held */ |
290 | static int z_erofs_attach_page(struct z_erofs_collector *clt, | |
291 | struct page *page, | |
292 | enum z_erofs_page_type type) | |
3883a79a GX |
293 | { |
294 | int ret; | |
295 | bool occupied; | |
296 | ||
97e86a85 GX |
297 | /* give priority for inplaceio */ |
298 | if (clt->mode >= COLLECT_PRIMARY && | |
447a3621 | 299 | type == Z_EROFS_PAGE_TYPE_EXCLUSIVE && |
99634bf3 | 300 | z_erofs_try_inplace_io(clt, page)) |
3883a79a GX |
301 | return 0; |
302 | ||
97e86a85 | 303 | ret = z_erofs_pagevec_enqueue(&clt->vector, |
046d64e1 | 304 | page, type, &occupied); |
97e86a85 | 305 | clt->cl->vcnt += (unsigned int)ret; |
3883a79a GX |
306 | |
307 | return ret ? 0 : -EAGAIN; | |
308 | } | |
309 | ||
97e86a85 GX |
310 | static enum z_erofs_collectmode |
311 | try_to_claim_pcluster(struct z_erofs_pcluster *pcl, | |
312 | z_erofs_next_pcluster_t *owned_head) | |
3883a79a | 313 | { |
97e86a85 | 314 | /* let's claim these following types of pclusters */ |
3883a79a | 315 | retry: |
97e86a85 GX |
316 | if (pcl->next == Z_EROFS_PCLUSTER_NIL) { |
317 | /* type 1, nil pcluster */ | |
318 | if (cmpxchg(&pcl->next, Z_EROFS_PCLUSTER_NIL, | |
319 | *owned_head) != Z_EROFS_PCLUSTER_NIL) | |
3883a79a GX |
320 | goto retry; |
321 | ||
97e86a85 | 322 | *owned_head = &pcl->next; |
a112152f | 323 | /* lucky, I am the followee :) */ |
97e86a85 GX |
324 | return COLLECT_PRIMARY_FOLLOWED; |
325 | } else if (pcl->next == Z_EROFS_PCLUSTER_TAIL) { | |
3883a79a GX |
326 | /* |
327 | * type 2, link to the end of a existing open chain, | |
328 | * be careful that its submission itself is governed | |
329 | * by the original owned chain. | |
330 | */ | |
97e86a85 GX |
331 | if (cmpxchg(&pcl->next, Z_EROFS_PCLUSTER_TAIL, |
332 | *owned_head) != Z_EROFS_PCLUSTER_TAIL) | |
3883a79a | 333 | goto retry; |
97e86a85 GX |
334 | *owned_head = Z_EROFS_PCLUSTER_TAIL; |
335 | return COLLECT_PRIMARY_HOOKED; | |
a112152f | 336 | } |
97e86a85 | 337 | return COLLECT_PRIMARY; /* :( better luck next time */ |
3883a79a GX |
338 | } |
339 | ||
9e579fc1 GX |
340 | static int z_erofs_lookup_collection(struct z_erofs_collector *clt, |
341 | struct inode *inode, | |
342 | struct erofs_map_blocks *map) | |
3883a79a | 343 | { |
97e86a85 GX |
344 | struct erofs_workgroup *grp; |
345 | struct z_erofs_pcluster *pcl; | |
346 | struct z_erofs_collection *cl; | |
347 | unsigned int length; | |
97e86a85 | 348 | |
997626d8 | 349 | grp = erofs_find_workgroup(inode->i_sb, map->m_pa >> PAGE_SHIFT); |
97e86a85 | 350 | if (!grp) |
9e579fc1 | 351 | return -ENOENT; |
3883a79a | 352 | |
97e86a85 | 353 | pcl = container_of(grp, struct z_erofs_pcluster, obj); |
bfc4ccb1 GX |
354 | if (clt->owned_head == &pcl->next || pcl == clt->tailpcl) { |
355 | DBG_BUGON(1); | |
356 | erofs_workgroup_put(grp); | |
9e579fc1 | 357 | return -EFSCORRUPTED; |
bfc4ccb1 | 358 | } |
97e86a85 GX |
359 | |
360 | cl = z_erofs_primarycollection(pcl); | |
8d8a09b0 | 361 | if (cl->pageofs != (map->m_la & ~PAGE_MASK)) { |
97e86a85 | 362 | DBG_BUGON(1); |
138e1a09 | 363 | erofs_workgroup_put(grp); |
9e579fc1 | 364 | return -EFSCORRUPTED; |
97e86a85 | 365 | } |
3883a79a | 366 | |
97e86a85 GX |
367 | length = READ_ONCE(pcl->length); |
368 | if (length & Z_EROFS_PCLUSTER_FULL_LENGTH) { | |
369 | if ((map->m_llen << Z_EROFS_PCLUSTER_LENGTH_BIT) > length) { | |
370 | DBG_BUGON(1); | |
138e1a09 | 371 | erofs_workgroup_put(grp); |
9e579fc1 | 372 | return -EFSCORRUPTED; |
97e86a85 GX |
373 | } |
374 | } else { | |
375 | unsigned int llen = map->m_llen << Z_EROFS_PCLUSTER_LENGTH_BIT; | |
3883a79a | 376 | |
97e86a85 GX |
377 | if (map->m_flags & EROFS_MAP_FULL_MAPPED) |
378 | llen |= Z_EROFS_PCLUSTER_FULL_LENGTH; | |
3883a79a | 379 | |
97e86a85 GX |
380 | while (llen > length && |
381 | length != cmpxchg_relaxed(&pcl->length, length, llen)) { | |
382 | cpu_relax(); | |
383 | length = READ_ONCE(pcl->length); | |
384 | } | |
385 | } | |
386 | mutex_lock(&cl->lock); | |
bfc4ccb1 GX |
387 | /* used to check tail merging loop due to corrupted images */ |
388 | if (clt->owned_head == Z_EROFS_PCLUSTER_TAIL) | |
389 | clt->tailpcl = pcl; | |
97e86a85 | 390 | clt->mode = try_to_claim_pcluster(pcl, &clt->owned_head); |
bfc4ccb1 GX |
391 | /* clean tailpcl if the current owned_head is Z_EROFS_PCLUSTER_TAIL */ |
392 | if (clt->owned_head == Z_EROFS_PCLUSTER_TAIL) | |
393 | clt->tailpcl = NULL; | |
97e86a85 GX |
394 | clt->pcl = pcl; |
395 | clt->cl = cl; | |
9e579fc1 | 396 | return 0; |
3883a79a GX |
397 | } |
398 | ||
9e579fc1 GX |
399 | static int z_erofs_register_collection(struct z_erofs_collector *clt, |
400 | struct inode *inode, | |
401 | struct erofs_map_blocks *map) | |
3883a79a | 402 | { |
97e86a85 GX |
403 | struct z_erofs_pcluster *pcl; |
404 | struct z_erofs_collection *cl; | |
405 | int err; | |
e5e3abba | 406 | |
3883a79a | 407 | /* no available workgroup, let's allocate one */ |
97e86a85 | 408 | pcl = kmem_cache_alloc(pcluster_cachep, GFP_NOFS); |
8d8a09b0 | 409 | if (!pcl) |
9e579fc1 | 410 | return -ENOMEM; |
3883a79a | 411 | |
99634bf3 | 412 | z_erofs_pcluster_init_always(pcl); |
97e86a85 | 413 | pcl->obj.index = map->m_pa >> PAGE_SHIFT; |
3883a79a | 414 | |
97e86a85 GX |
415 | pcl->length = (map->m_llen << Z_EROFS_PCLUSTER_LENGTH_BIT) | |
416 | (map->m_flags & EROFS_MAP_FULL_MAPPED ? | |
417 | Z_EROFS_PCLUSTER_FULL_LENGTH : 0); | |
3883a79a | 418 | |
97e86a85 GX |
419 | if (map->m_flags & EROFS_MAP_ZIPPED) |
420 | pcl->algorithmformat = Z_EROFS_COMPRESSION_LZ4; | |
421 | else | |
422 | pcl->algorithmformat = Z_EROFS_COMPRESSION_SHIFTED; | |
423 | ||
a5876e24 | 424 | pcl->clusterbits = EROFS_I(inode)->z_physical_clusterbits[0]; |
97e86a85 | 425 | pcl->clusterbits -= PAGE_SHIFT; |
b6a76183 | 426 | |
97e86a85 GX |
427 | /* new pclusters should be claimed as type 1, primary and followed */ |
428 | pcl->next = clt->owned_head; | |
429 | clt->mode = COLLECT_PRIMARY_FOLLOWED; | |
3883a79a | 430 | |
97e86a85 GX |
431 | cl = z_erofs_primarycollection(pcl); |
432 | cl->pageofs = map->m_la & ~PAGE_MASK; | |
3883a79a | 433 | |
23edf3ab GX |
434 | /* |
435 | * lock all primary followed works before visible to others | |
97e86a85 | 436 | * and mutex_trylock *never* fails for a new pcluster. |
23edf3ab | 437 | */ |
97e86a85 | 438 | mutex_trylock(&cl->lock); |
23edf3ab | 439 | |
e5e9a432 | 440 | err = erofs_register_workgroup(inode->i_sb, &pcl->obj); |
97e86a85 GX |
441 | if (err) { |
442 | mutex_unlock(&cl->lock); | |
443 | kmem_cache_free(pcluster_cachep, pcl); | |
9e579fc1 | 444 | return -EAGAIN; |
3883a79a | 445 | } |
bfc4ccb1 GX |
446 | /* used to check tail merging loop due to corrupted images */ |
447 | if (clt->owned_head == Z_EROFS_PCLUSTER_TAIL) | |
448 | clt->tailpcl = pcl; | |
97e86a85 GX |
449 | clt->owned_head = &pcl->next; |
450 | clt->pcl = pcl; | |
451 | clt->cl = cl; | |
9e579fc1 | 452 | return 0; |
3883a79a GX |
453 | } |
454 | ||
97e86a85 GX |
455 | static int z_erofs_collector_begin(struct z_erofs_collector *clt, |
456 | struct inode *inode, | |
457 | struct erofs_map_blocks *map) | |
458 | { | |
9e579fc1 | 459 | int ret; |
a112152f | 460 | |
97e86a85 | 461 | DBG_BUGON(clt->cl); |
3883a79a | 462 | |
97e86a85 GX |
463 | /* must be Z_EROFS_PCLUSTER_TAIL or pointed to previous collection */ |
464 | DBG_BUGON(clt->owned_head == Z_EROFS_PCLUSTER_NIL); | |
465 | DBG_BUGON(clt->owned_head == Z_EROFS_PCLUSTER_TAIL_CLOSED); | |
3883a79a | 466 | |
97e86a85 GX |
467 | if (!PAGE_ALIGNED(map->m_pa)) { |
468 | DBG_BUGON(1); | |
469 | return -EINVAL; | |
3883a79a GX |
470 | } |
471 | ||
97e86a85 | 472 | repeat: |
9e579fc1 GX |
473 | ret = z_erofs_lookup_collection(clt, inode, map); |
474 | if (ret == -ENOENT) { | |
475 | ret = z_erofs_register_collection(clt, inode, map); | |
3883a79a | 476 | |
9e579fc1 GX |
477 | /* someone registered at the same time, give another try */ |
478 | if (ret == -EAGAIN) { | |
479 | cond_resched(); | |
97e86a85 | 480 | goto repeat; |
9e579fc1 | 481 | } |
3883a79a GX |
482 | } |
483 | ||
9e579fc1 GX |
484 | if (ret) |
485 | return ret; | |
97e86a85 GX |
486 | |
487 | z_erofs_pagevec_ctor_init(&clt->vector, Z_EROFS_NR_INLINE_PAGEVECS, | |
9e579fc1 | 488 | clt->cl->pagevec, clt->cl->vcnt); |
97e86a85 GX |
489 | |
490 | clt->compressedpages = clt->pcl->compressed_pages; | |
491 | if (clt->mode <= COLLECT_PRIMARY) /* cannot do in-place I/O */ | |
492 | clt->compressedpages += Z_EROFS_CLUSTER_MAX_PAGES; | |
3883a79a GX |
493 | return 0; |
494 | } | |
495 | ||
496 | /* | |
97e86a85 GX |
497 | * keep in mind that no referenced pclusters will be freed |
498 | * only after a RCU grace period. | |
3883a79a GX |
499 | */ |
500 | static void z_erofs_rcu_callback(struct rcu_head *head) | |
501 | { | |
97e86a85 GX |
502 | struct z_erofs_collection *const cl = |
503 | container_of(head, struct z_erofs_collection, rcu); | |
3883a79a | 504 | |
97e86a85 GX |
505 | kmem_cache_free(pcluster_cachep, |
506 | container_of(cl, struct z_erofs_pcluster, | |
507 | primary_collection)); | |
3883a79a GX |
508 | } |
509 | ||
510 | void erofs_workgroup_free_rcu(struct erofs_workgroup *grp) | |
511 | { | |
97e86a85 GX |
512 | struct z_erofs_pcluster *const pcl = |
513 | container_of(grp, struct z_erofs_pcluster, obj); | |
514 | struct z_erofs_collection *const cl = z_erofs_primarycollection(pcl); | |
3883a79a | 515 | |
97e86a85 | 516 | call_rcu(&cl->rcu, z_erofs_rcu_callback); |
3883a79a GX |
517 | } |
518 | ||
97e86a85 | 519 | static void z_erofs_collection_put(struct z_erofs_collection *cl) |
3883a79a | 520 | { |
97e86a85 GX |
521 | struct z_erofs_pcluster *const pcl = |
522 | container_of(cl, struct z_erofs_pcluster, primary_collection); | |
3883a79a | 523 | |
97e86a85 | 524 | erofs_workgroup_put(&pcl->obj); |
3883a79a GX |
525 | } |
526 | ||
97e86a85 | 527 | static bool z_erofs_collector_end(struct z_erofs_collector *clt) |
3883a79a | 528 | { |
97e86a85 | 529 | struct z_erofs_collection *cl = clt->cl; |
3883a79a | 530 | |
97e86a85 | 531 | if (!cl) |
3883a79a GX |
532 | return false; |
533 | ||
97e86a85 GX |
534 | z_erofs_pagevec_ctor_exit(&clt->vector, false); |
535 | mutex_unlock(&cl->lock); | |
3883a79a GX |
536 | |
537 | /* | |
97e86a85 GX |
538 | * if all pending pages are added, don't hold its reference |
539 | * any longer if the pcluster isn't hosted by ourselves. | |
3883a79a | 540 | */ |
97e86a85 GX |
541 | if (clt->mode < COLLECT_PRIMARY_FOLLOWED_NOINPLACE) |
542 | z_erofs_collection_put(cl); | |
3883a79a | 543 | |
97e86a85 | 544 | clt->cl = NULL; |
3883a79a GX |
545 | return true; |
546 | } | |
547 | ||
97e86a85 | 548 | static bool should_alloc_managed_pages(struct z_erofs_decompress_frontend *fe, |
4279f3f9 | 549 | unsigned int cachestrategy, |
97e86a85 | 550 | erofs_off_t la) |
92e6efd5 | 551 | { |
4279f3f9 GX |
552 | if (cachestrategy <= EROFS_ZIP_CACHE_DISABLED) |
553 | return false; | |
554 | ||
92e6efd5 GX |
555 | if (fe->backmost) |
556 | return true; | |
557 | ||
4279f3f9 GX |
558 | return cachestrategy >= EROFS_ZIP_CACHE_READAROUND && |
559 | la < fe->headoffset; | |
92e6efd5 | 560 | } |
92e6efd5 | 561 | |
97e86a85 | 562 | static int z_erofs_do_read_page(struct z_erofs_decompress_frontend *fe, |
3883a79a | 563 | struct page *page, |
97e86a85 | 564 | struct list_head *pagepool) |
3883a79a | 565 | { |
97e86a85 | 566 | struct inode *const inode = fe->inode; |
bda17a45 | 567 | struct erofs_sb_info *const sbi = EROFS_I_SB(inode); |
3b423417 | 568 | struct erofs_map_blocks *const map = &fe->map; |
97e86a85 | 569 | struct z_erofs_collector *const clt = &fe->clt; |
3883a79a | 570 | const loff_t offset = page_offset(page); |
dc76ea8c | 571 | bool tight = true; |
3883a79a | 572 | |
92e6efd5 | 573 | enum z_erofs_cache_alloctype cache_strategy; |
3883a79a | 574 | enum z_erofs_page_type page_type; |
7dd68b14 | 575 | unsigned int cur, end, spiltted, index; |
1e05ff36 | 576 | int err = 0; |
3883a79a GX |
577 | |
578 | /* register locked file pages as online pages in pack */ | |
579 | z_erofs_onlinepage_init(page); | |
580 | ||
581 | spiltted = 0; | |
582 | end = PAGE_SIZE; | |
583 | repeat: | |
584 | cur = end - 1; | |
585 | ||
586 | /* lucky, within the range of the current map_blocks */ | |
587 | if (offset + cur >= map->m_la && | |
447a3621 | 588 | offset + cur < map->m_la + map->m_llen) { |
97e86a85 GX |
589 | /* didn't get a valid collection previously (very rare) */ |
590 | if (!clt->cl) | |
1e5ceeab | 591 | goto restart_now; |
3883a79a | 592 | goto hitted; |
1e5ceeab | 593 | } |
3883a79a GX |
594 | |
595 | /* go ahead the next map_blocks */ | |
4f761fa2 | 596 | erofs_dbg("%s: [out-of-range] pos %llu", __func__, offset + cur); |
3883a79a | 597 | |
97e86a85 | 598 | if (z_erofs_collector_end(clt)) |
f0c519fc | 599 | fe->backmost = false; |
3883a79a GX |
600 | |
601 | map->m_la = offset + cur; | |
602 | map->m_llen = 0; | |
97e86a85 | 603 | err = z_erofs_map_blocks_iter(inode, map, 0); |
8d8a09b0 | 604 | if (err) |
3883a79a GX |
605 | goto err_out; |
606 | ||
1e5ceeab | 607 | restart_now: |
8d8a09b0 | 608 | if (!(map->m_flags & EROFS_MAP_MAPPED)) |
3883a79a GX |
609 | goto hitted; |
610 | ||
97e86a85 | 611 | err = z_erofs_collector_begin(clt, inode, map); |
8d8a09b0 | 612 | if (err) |
3883a79a GX |
613 | goto err_out; |
614 | ||
92e6efd5 | 615 | /* preload all compressed pages (maybe downgrade role if necessary) */ |
4279f3f9 | 616 | if (should_alloc_managed_pages(fe, sbi->cache_strategy, map->m_la)) |
92e6efd5 GX |
617 | cache_strategy = DELAYEDALLOC; |
618 | else | |
619 | cache_strategy = DONTALLOC; | |
620 | ||
97e86a85 GX |
621 | preload_compressed_pages(clt, MNGD_MAPPING(sbi), |
622 | cache_strategy, pagepool); | |
105d4ad8 | 623 | |
3883a79a | 624 | hitted: |
dc76ea8c GX |
625 | /* |
626 | * Ensure the current partial page belongs to this submit chain rather | |
627 | * than other concurrent submit chains or the noio(bypass) chain since | |
628 | * those chains are handled asynchronously thus the page cannot be used | |
629 | * for inplace I/O or pagevec (should be processed in strict order.) | |
630 | */ | |
631 | tight &= (clt->mode >= COLLECT_PRIMARY_HOOKED && | |
632 | clt->mode != COLLECT_PRIMARY_FOLLOWED_NOINPLACE); | |
633 | ||
7dd68b14 | 634 | cur = end - min_t(unsigned int, offset + end - map->m_la, end); |
8d8a09b0 | 635 | if (!(map->m_flags & EROFS_MAP_MAPPED)) { |
3883a79a GX |
636 | zero_user_segment(page, cur, end); |
637 | goto next_part; | |
638 | } | |
639 | ||
640 | /* let's derive page type */ | |
641 | page_type = cur ? Z_EROFS_VLE_PAGE_TYPE_HEAD : | |
642 | (!spiltted ? Z_EROFS_PAGE_TYPE_EXCLUSIVE : | |
643 | (tight ? Z_EROFS_PAGE_TYPE_EXCLUSIVE : | |
644 | Z_EROFS_VLE_PAGE_TYPE_TAIL_SHARED)); | |
645 | ||
a112152f | 646 | if (cur) |
97e86a85 | 647 | tight &= (clt->mode >= COLLECT_PRIMARY_FOLLOWED); |
a112152f | 648 | |
3883a79a | 649 | retry: |
97e86a85 | 650 | err = z_erofs_attach_page(clt, page, page_type); |
3883a79a GX |
651 | /* should allocate an additional staging page for pagevec */ |
652 | if (err == -EAGAIN) { | |
653 | struct page *const newpage = | |
5ddcee1f | 654 | erofs_allocpage(pagepool, GFP_NOFS | __GFP_NOFAIL); |
3883a79a | 655 | |
5ddcee1f | 656 | newpage->mapping = Z_EROFS_MAPPING_STAGING; |
97e86a85 GX |
657 | err = z_erofs_attach_page(clt, newpage, |
658 | Z_EROFS_PAGE_TYPE_EXCLUSIVE); | |
8d8a09b0 | 659 | if (!err) |
3883a79a GX |
660 | goto retry; |
661 | } | |
662 | ||
8d8a09b0 | 663 | if (err) |
3883a79a GX |
664 | goto err_out; |
665 | ||
97e86a85 | 666 | index = page->index - (map->m_la >> PAGE_SHIFT); |
3883a79a | 667 | |
3883a79a | 668 | z_erofs_onlinepage_fixup(page, index, true); |
3883a79a | 669 | |
1e05ff36 GX |
670 | /* bump up the number of spiltted parts of a page */ |
671 | ++spiltted; | |
672 | /* also update nr_pages */ | |
97e86a85 | 673 | clt->cl->nr_pages = max_t(pgoff_t, clt->cl->nr_pages, index + 1); |
3883a79a GX |
674 | next_part: |
675 | /* can be used for verification */ | |
676 | map->m_llen = offset + cur - map->m_la; | |
677 | ||
2bc75964 KČ |
678 | end = cur; |
679 | if (end > 0) | |
3883a79a GX |
680 | goto repeat; |
681 | ||
1e05ff36 | 682 | out: |
3883a79a GX |
683 | z_erofs_onlinepage_endio(page); |
684 | ||
4f761fa2 GX |
685 | erofs_dbg("%s, finish page: %pK spiltted: %u map->m_llen %llu", |
686 | __func__, page, spiltted, map->m_llen); | |
1e05ff36 | 687 | return err; |
3883a79a | 688 | |
1e05ff36 | 689 | /* if some error occurred while processing this page */ |
3883a79a | 690 | err_out: |
1e05ff36 GX |
691 | SetPageError(page); |
692 | goto out; | |
3883a79a GX |
693 | } |
694 | ||
a4b1fab1 GX |
695 | static void z_erofs_decompress_kickoff(struct z_erofs_decompressqueue *io, |
696 | bool sync, int bios) | |
3883a79a | 697 | { |
a4b1fab1 GX |
698 | /* wake up the caller thread for sync decompression */ |
699 | if (sync) { | |
848bd9ac GX |
700 | unsigned long flags; |
701 | ||
702 | spin_lock_irqsave(&io->u.wait.lock, flags); | |
703 | if (!atomic_add_return(bios, &io->pending_bios)) | |
704 | wake_up_locked(&io->u.wait); | |
705 | spin_unlock_irqrestore(&io->u.wait.lock, flags); | |
3883a79a | 706 | return; |
848bd9ac | 707 | } |
3883a79a | 708 | |
848bd9ac | 709 | if (!atomic_add_return(bios, &io->pending_bios)) |
3883a79a | 710 | queue_work(z_erofs_workqueue, &io->u.work); |
3883a79a GX |
711 | } |
712 | ||
0c638f70 | 713 | static void z_erofs_decompressqueue_endio(struct bio *bio) |
3883a79a | 714 | { |
a4b1fab1 GX |
715 | tagptr1_t t = tagptr_init(tagptr1_t, bio->bi_private); |
716 | struct z_erofs_decompressqueue *q = tagptr_unfold_ptr(t); | |
14a56ec6 | 717 | blk_status_t err = bio->bi_status; |
3883a79a | 718 | struct bio_vec *bvec; |
6dc4f100 | 719 | struct bvec_iter_all iter_all; |
3883a79a | 720 | |
2b070cfe | 721 | bio_for_each_segment_all(bvec, bio, iter_all) { |
3883a79a GX |
722 | struct page *page = bvec->bv_page; |
723 | ||
724 | DBG_BUGON(PageUptodate(page)); | |
70b17991 | 725 | DBG_BUGON(!page->mapping); |
3883a79a | 726 | |
8d8a09b0 | 727 | if (err) |
3883a79a | 728 | SetPageError(page); |
105d4ad8 | 729 | |
a4b1fab1 GX |
730 | if (erofs_page_is_managed(EROFS_SB(q->sb), page)) { |
731 | if (!err) | |
732 | SetPageUptodate(page); | |
105d4ad8 | 733 | unlock_page(page); |
a4b1fab1 | 734 | } |
3883a79a | 735 | } |
a4b1fab1 | 736 | z_erofs_decompress_kickoff(q, tagptr_unfold_tags(t), -1); |
3883a79a GX |
737 | bio_put(bio); |
738 | } | |
739 | ||
97e86a85 GX |
740 | static int z_erofs_decompress_pcluster(struct super_block *sb, |
741 | struct z_erofs_pcluster *pcl, | |
742 | struct list_head *pagepool) | |
3883a79a GX |
743 | { |
744 | struct erofs_sb_info *const sbi = EROFS_SB(sb); | |
97e86a85 | 745 | const unsigned int clusterpages = BIT(pcl->clusterbits); |
3883a79a | 746 | struct z_erofs_pagevec_ctor ctor; |
97e86a85 GX |
747 | unsigned int i, outputsize, llen, nr_pages; |
748 | struct page *pages_onstack[Z_EROFS_VMAP_ONSTACK_PAGES]; | |
3883a79a | 749 | struct page **pages, **compressed_pages, *page; |
3883a79a GX |
750 | |
751 | enum z_erofs_page_type page_type; | |
b6a76183 | 752 | bool overlapped, partial; |
97e86a85 | 753 | struct z_erofs_collection *cl; |
3883a79a GX |
754 | int err; |
755 | ||
756 | might_sleep(); | |
97e86a85 GX |
757 | cl = z_erofs_primarycollection(pcl); |
758 | DBG_BUGON(!READ_ONCE(cl->nr_pages)); | |
3883a79a | 759 | |
97e86a85 GX |
760 | mutex_lock(&cl->lock); |
761 | nr_pages = cl->nr_pages; | |
3883a79a | 762 | |
8d8a09b0 | 763 | if (nr_pages <= Z_EROFS_VMAP_ONSTACK_PAGES) { |
3883a79a | 764 | pages = pages_onstack; |
97e86a85 GX |
765 | } else if (nr_pages <= Z_EROFS_VMAP_GLOBAL_PAGES && |
766 | mutex_trylock(&z_pagemap_global_lock)) { | |
3883a79a | 767 | pages = z_pagemap_global; |
97e86a85 | 768 | } else { |
441dfcc8 CY |
769 | gfp_t gfp_flags = GFP_KERNEL; |
770 | ||
97e86a85 | 771 | if (nr_pages > Z_EROFS_VMAP_GLOBAL_PAGES) |
441dfcc8 CY |
772 | gfp_flags |= __GFP_NOFAIL; |
773 | ||
447a3621 | 774 | pages = kvmalloc_array(nr_pages, sizeof(struct page *), |
441dfcc8 | 775 | gfp_flags); |
3883a79a GX |
776 | |
777 | /* fallback to global pagemap for the lowmem scenario */ | |
8d8a09b0 | 778 | if (!pages) { |
441dfcc8 CY |
779 | mutex_lock(&z_pagemap_global_lock); |
780 | pages = z_pagemap_global; | |
3883a79a GX |
781 | } |
782 | } | |
783 | ||
784 | for (i = 0; i < nr_pages; ++i) | |
785 | pages[i] = NULL; | |
786 | ||
e12a0ce2 | 787 | err = 0; |
fa61a33f | 788 | z_erofs_pagevec_ctor_init(&ctor, Z_EROFS_NR_INLINE_PAGEVECS, |
97e86a85 | 789 | cl->pagevec, 0); |
3883a79a | 790 | |
97e86a85 | 791 | for (i = 0; i < cl->vcnt; ++i) { |
7dd68b14 | 792 | unsigned int pagenr; |
3883a79a | 793 | |
046d64e1 | 794 | page = z_erofs_pagevec_dequeue(&ctor, &page_type); |
3883a79a GX |
795 | |
796 | /* all pages in pagevec ought to be valid */ | |
42d40b4a CS |
797 | DBG_BUGON(!page); |
798 | DBG_BUGON(!page->mapping); | |
3883a79a | 799 | |
97e86a85 | 800 | if (z_erofs_put_stagingpage(pagepool, page)) |
3883a79a GX |
801 | continue; |
802 | ||
803 | if (page_type == Z_EROFS_VLE_PAGE_TYPE_HEAD) | |
804 | pagenr = 0; | |
805 | else | |
806 | pagenr = z_erofs_onlinepage_index(page); | |
807 | ||
70b17991 | 808 | DBG_BUGON(pagenr >= nr_pages); |
e5e3abba | 809 | |
e12a0ce2 GX |
810 | /* |
811 | * currently EROFS doesn't support multiref(dedup), | |
812 | * so here erroring out one multiref page. | |
813 | */ | |
8d8a09b0 | 814 | if (pages[pagenr]) { |
e12a0ce2 GX |
815 | DBG_BUGON(1); |
816 | SetPageError(pages[pagenr]); | |
817 | z_erofs_onlinepage_endio(pages[pagenr]); | |
818 | err = -EFSCORRUPTED; | |
819 | } | |
3883a79a GX |
820 | pages[pagenr] = page; |
821 | } | |
3883a79a GX |
822 | z_erofs_pagevec_ctor_exit(&ctor, true); |
823 | ||
824 | overlapped = false; | |
97e86a85 | 825 | compressed_pages = pcl->compressed_pages; |
3883a79a GX |
826 | |
827 | for (i = 0; i < clusterpages; ++i) { | |
7dd68b14 | 828 | unsigned int pagenr; |
3883a79a GX |
829 | |
830 | page = compressed_pages[i]; | |
831 | ||
832 | /* all compressed pages ought to be valid */ | |
42d40b4a CS |
833 | DBG_BUGON(!page); |
834 | DBG_BUGON(!page->mapping); | |
3883a79a | 835 | |
27481233 | 836 | if (!z_erofs_page_is_staging(page)) { |
d61fbb6b | 837 | if (erofs_page_is_managed(sbi, page)) { |
8d8a09b0 | 838 | if (!PageUptodate(page)) |
11152496 GX |
839 | err = -EIO; |
840 | continue; | |
841 | } | |
3883a79a | 842 | |
11152496 GX |
843 | /* |
844 | * only if non-head page can be selected | |
845 | * for inplace decompression | |
846 | */ | |
847 | pagenr = z_erofs_onlinepage_index(page); | |
3883a79a | 848 | |
11152496 | 849 | DBG_BUGON(pagenr >= nr_pages); |
8d8a09b0 | 850 | if (pages[pagenr]) { |
e12a0ce2 GX |
851 | DBG_BUGON(1); |
852 | SetPageError(pages[pagenr]); | |
853 | z_erofs_onlinepage_endio(pages[pagenr]); | |
854 | err = -EFSCORRUPTED; | |
855 | } | |
11152496 GX |
856 | pages[pagenr] = page; |
857 | ||
858 | overlapped = true; | |
859 | } | |
3883a79a | 860 | |
11152496 | 861 | /* PG_error needs checking for inplaced and staging pages */ |
8d8a09b0 | 862 | if (PageError(page)) { |
11152496 GX |
863 | DBG_BUGON(PageUptodate(page)); |
864 | err = -EIO; | |
865 | } | |
3883a79a GX |
866 | } |
867 | ||
8d8a09b0 | 868 | if (err) |
11152496 GX |
869 | goto out; |
870 | ||
97e86a85 GX |
871 | llen = pcl->length >> Z_EROFS_PCLUSTER_LENGTH_BIT; |
872 | if (nr_pages << PAGE_SHIFT >= cl->pageofs + llen) { | |
873 | outputsize = llen; | |
874 | partial = !(pcl->length & Z_EROFS_PCLUSTER_FULL_LENGTH); | |
b6a76183 | 875 | } else { |
97e86a85 | 876 | outputsize = (nr_pages << PAGE_SHIFT) - cl->pageofs; |
b6a76183 GX |
877 | partial = true; |
878 | } | |
3883a79a | 879 | |
88aaf5a7 GX |
880 | err = z_erofs_decompress(&(struct z_erofs_decompress_req) { |
881 | .sb = sb, | |
882 | .in = compressed_pages, | |
883 | .out = pages, | |
97e86a85 | 884 | .pageofs_out = cl->pageofs, |
88aaf5a7 GX |
885 | .inputsize = PAGE_SIZE, |
886 | .outputsize = outputsize, | |
97e86a85 | 887 | .alg = pcl->algorithmformat, |
88aaf5a7 | 888 | .inplace_io = overlapped, |
b6a76183 | 889 | .partial_decoding = partial |
97e86a85 | 890 | }, pagepool); |
3883a79a GX |
891 | |
892 | out: | |
af692e11 GX |
893 | /* must handle all compressed pages before endding pages */ |
894 | for (i = 0; i < clusterpages; ++i) { | |
895 | page = compressed_pages[i]; | |
896 | ||
d61fbb6b | 897 | if (erofs_page_is_managed(sbi, page)) |
af692e11 | 898 | continue; |
d61fbb6b | 899 | |
af692e11 | 900 | /* recycle all individual staging pages */ |
97e86a85 | 901 | (void)z_erofs_put_stagingpage(pagepool, page); |
af692e11 GX |
902 | |
903 | WRITE_ONCE(compressed_pages[i], NULL); | |
904 | } | |
905 | ||
3883a79a GX |
906 | for (i = 0; i < nr_pages; ++i) { |
907 | page = pages[i]; | |
af692e11 GX |
908 | if (!page) |
909 | continue; | |
910 | ||
42d40b4a | 911 | DBG_BUGON(!page->mapping); |
3883a79a GX |
912 | |
913 | /* recycle all individual staging pages */ | |
97e86a85 | 914 | if (z_erofs_put_stagingpage(pagepool, page)) |
3883a79a GX |
915 | continue; |
916 | ||
8d8a09b0 | 917 | if (err < 0) |
3883a79a GX |
918 | SetPageError(page); |
919 | ||
920 | z_erofs_onlinepage_endio(page); | |
921 | } | |
922 | ||
3883a79a GX |
923 | if (pages == z_pagemap_global) |
924 | mutex_unlock(&z_pagemap_global_lock); | |
8d8a09b0 | 925 | else if (pages != pages_onstack) |
3883a79a GX |
926 | kvfree(pages); |
927 | ||
97e86a85 GX |
928 | cl->nr_pages = 0; |
929 | cl->vcnt = 0; | |
3883a79a | 930 | |
97e86a85 GX |
931 | /* all cl locks MUST be taken before the following line */ |
932 | WRITE_ONCE(pcl->next, Z_EROFS_PCLUSTER_NIL); | |
3883a79a | 933 | |
97e86a85 GX |
934 | /* all cl locks SHOULD be released right now */ |
935 | mutex_unlock(&cl->lock); | |
3883a79a | 936 | |
97e86a85 | 937 | z_erofs_collection_put(cl); |
3883a79a GX |
938 | return err; |
939 | } | |
940 | ||
0c638f70 GX |
941 | static void z_erofs_decompress_queue(const struct z_erofs_decompressqueue *io, |
942 | struct list_head *pagepool) | |
3883a79a | 943 | { |
97e86a85 | 944 | z_erofs_next_pcluster_t owned = io->head; |
3883a79a | 945 | |
97e86a85 GX |
946 | while (owned != Z_EROFS_PCLUSTER_TAIL_CLOSED) { |
947 | struct z_erofs_pcluster *pcl; | |
3883a79a GX |
948 | |
949 | /* no possible that 'owned' equals Z_EROFS_WORK_TPTR_TAIL */ | |
97e86a85 | 950 | DBG_BUGON(owned == Z_EROFS_PCLUSTER_TAIL); |
3883a79a GX |
951 | |
952 | /* no possible that 'owned' equals NULL */ | |
97e86a85 | 953 | DBG_BUGON(owned == Z_EROFS_PCLUSTER_NIL); |
3883a79a | 954 | |
97e86a85 GX |
955 | pcl = container_of(owned, struct z_erofs_pcluster, next); |
956 | owned = READ_ONCE(pcl->next); | |
3883a79a | 957 | |
a4b1fab1 | 958 | z_erofs_decompress_pcluster(io->sb, pcl, pagepool); |
3978c8e3 | 959 | } |
3883a79a GX |
960 | } |
961 | ||
0c638f70 | 962 | static void z_erofs_decompressqueue_work(struct work_struct *work) |
3883a79a | 963 | { |
a4b1fab1 GX |
964 | struct z_erofs_decompressqueue *bgq = |
965 | container_of(work, struct z_erofs_decompressqueue, u.work); | |
97e86a85 | 966 | LIST_HEAD(pagepool); |
3883a79a | 967 | |
a4b1fab1 | 968 | DBG_BUGON(bgq->head == Z_EROFS_PCLUSTER_TAIL_CLOSED); |
0c638f70 | 969 | z_erofs_decompress_queue(bgq, &pagepool); |
3883a79a | 970 | |
97e86a85 | 971 | put_pages_list(&pagepool); |
a4b1fab1 | 972 | kvfree(bgq); |
3883a79a GX |
973 | } |
974 | ||
97e86a85 GX |
975 | static struct page *pickup_page_for_submission(struct z_erofs_pcluster *pcl, |
976 | unsigned int nr, | |
977 | struct list_head *pagepool, | |
978 | struct address_space *mc, | |
979 | gfp_t gfp) | |
9248fce7 | 980 | { |
97e86a85 | 981 | const pgoff_t index = pcl->obj.index; |
9248fce7 GX |
982 | bool tocache = false; |
983 | ||
984 | struct address_space *mapping; | |
985 | struct page *oldpage, *page; | |
986 | ||
92e6efd5 GX |
987 | compressed_page_t t; |
988 | int justfound; | |
989 | ||
9248fce7 | 990 | repeat: |
97e86a85 | 991 | page = READ_ONCE(pcl->compressed_pages[nr]); |
9248fce7 GX |
992 | oldpage = page; |
993 | ||
994 | if (!page) | |
995 | goto out_allocpage; | |
996 | ||
997 | /* | |
998 | * the cached page has not been allocated and | |
999 | * an placeholder is out there, prepare it now. | |
1000 | */ | |
bda17a45 | 1001 | if (page == PAGE_UNALLOCATED) { |
9248fce7 GX |
1002 | tocache = true; |
1003 | goto out_allocpage; | |
1004 | } | |
1005 | ||
92e6efd5 GX |
1006 | /* process the target tagged pointer */ |
1007 | t = tagptr_init(compressed_page_t, page); | |
1008 | justfound = tagptr_unfold_tags(t); | |
1009 | page = tagptr_unfold_ptr(t); | |
1010 | ||
9248fce7 GX |
1011 | mapping = READ_ONCE(page->mapping); |
1012 | ||
9248fce7 GX |
1013 | /* |
1014 | * unmanaged (file) pages are all locked solidly, | |
1015 | * therefore it is impossible for `mapping' to be NULL. | |
1016 | */ | |
1017 | if (mapping && mapping != mc) | |
1018 | /* ought to be unmanaged pages */ | |
1019 | goto out; | |
1020 | ||
1021 | lock_page(page); | |
1022 | ||
92e6efd5 GX |
1023 | /* only true if page reclaim goes wrong, should never happen */ |
1024 | DBG_BUGON(justfound && PagePrivate(page)); | |
1025 | ||
9248fce7 GX |
1026 | /* the page is still in manage cache */ |
1027 | if (page->mapping == mc) { | |
97e86a85 | 1028 | WRITE_ONCE(pcl->compressed_pages[nr], page); |
9248fce7 | 1029 | |
11152496 | 1030 | ClearPageError(page); |
9248fce7 | 1031 | if (!PagePrivate(page)) { |
92e6efd5 GX |
1032 | /* |
1033 | * impossible to be !PagePrivate(page) for | |
1034 | * the current restriction as well if | |
1035 | * the page is already in compressed_pages[]. | |
1036 | */ | |
1037 | DBG_BUGON(!justfound); | |
1038 | ||
1039 | justfound = 0; | |
97e86a85 | 1040 | set_page_private(page, (unsigned long)pcl); |
9248fce7 GX |
1041 | SetPagePrivate(page); |
1042 | } | |
1043 | ||
1044 | /* no need to submit io if it is already up-to-date */ | |
1045 | if (PageUptodate(page)) { | |
1046 | unlock_page(page); | |
1047 | page = NULL; | |
1048 | } | |
1049 | goto out; | |
1050 | } | |
1051 | ||
1052 | /* | |
1053 | * the managed page has been truncated, it's unsafe to | |
1054 | * reuse this one, let's allocate a new cache-managed page. | |
1055 | */ | |
1056 | DBG_BUGON(page->mapping); | |
92e6efd5 | 1057 | DBG_BUGON(!justfound); |
9248fce7 GX |
1058 | |
1059 | tocache = true; | |
1060 | unlock_page(page); | |
1061 | put_page(page); | |
1062 | out_allocpage: | |
5ddcee1f GX |
1063 | page = erofs_allocpage(pagepool, gfp | __GFP_NOFAIL); |
1064 | if (!tocache || add_to_page_cache_lru(page, mc, index + nr, gfp)) { | |
1065 | /* non-LRU / non-movable temporary page is needed */ | |
9248fce7 | 1066 | page->mapping = Z_EROFS_MAPPING_STAGING; |
5ddcee1f | 1067 | tocache = false; |
9248fce7 GX |
1068 | } |
1069 | ||
5ddcee1f GX |
1070 | if (oldpage != cmpxchg(&pcl->compressed_pages[nr], oldpage, page)) { |
1071 | if (tocache) { | |
1072 | /* since it added to managed cache successfully */ | |
1073 | unlock_page(page); | |
1074 | put_page(page); | |
1075 | } else { | |
1076 | list_add(&page->lru, pagepool); | |
1077 | } | |
1078 | cond_resched(); | |
1079 | goto repeat; | |
1080 | } | |
97e86a85 | 1081 | set_page_private(page, (unsigned long)pcl); |
9248fce7 GX |
1082 | SetPagePrivate(page); |
1083 | out: /* the only exit (for tracing and debugging) */ | |
1084 | return page; | |
1085 | } | |
1086 | ||
a4b1fab1 GX |
1087 | static struct z_erofs_decompressqueue * |
1088 | jobqueue_init(struct super_block *sb, | |
1089 | struct z_erofs_decompressqueue *fgq, bool *fg) | |
3883a79a | 1090 | { |
a4b1fab1 | 1091 | struct z_erofs_decompressqueue *q; |
3883a79a | 1092 | |
a4b1fab1 GX |
1093 | if (fg && !*fg) { |
1094 | q = kvzalloc(sizeof(*q), GFP_KERNEL | __GFP_NOWARN); | |
1095 | if (!q) { | |
1096 | *fg = true; | |
1097 | goto fg_out; | |
1098 | } | |
0c638f70 | 1099 | INIT_WORK(&q->u.work, z_erofs_decompressqueue_work); |
a4b1fab1 GX |
1100 | } else { |
1101 | fg_out: | |
1102 | q = fgq; | |
1103 | init_waitqueue_head(&fgq->u.wait); | |
1104 | atomic_set(&fgq->pending_bios, 0); | |
3883a79a | 1105 | } |
a4b1fab1 GX |
1106 | q->sb = sb; |
1107 | q->head = Z_EROFS_PCLUSTER_TAIL_CLOSED; | |
1108 | return q; | |
3883a79a GX |
1109 | } |
1110 | ||
97e86a85 | 1111 | /* define decompression jobqueue types */ |
7146a4f0 | 1112 | enum { |
7146a4f0 | 1113 | JQ_BYPASS, |
7146a4f0 GX |
1114 | JQ_SUBMIT, |
1115 | NR_JOBQUEUES, | |
1116 | }; | |
1117 | ||
1118 | static void *jobqueueset_init(struct super_block *sb, | |
a4b1fab1 GX |
1119 | struct z_erofs_decompressqueue *q[], |
1120 | struct z_erofs_decompressqueue *fgq, bool *fg) | |
7146a4f0 | 1121 | { |
7146a4f0 GX |
1122 | /* |
1123 | * if managed cache is enabled, bypass jobqueue is needed, | |
97e86a85 | 1124 | * no need to read from device for all pclusters in this queue. |
7146a4f0 | 1125 | */ |
a4b1fab1 GX |
1126 | q[JQ_BYPASS] = jobqueue_init(sb, fgq + JQ_BYPASS, NULL); |
1127 | q[JQ_SUBMIT] = jobqueue_init(sb, fgq + JQ_SUBMIT, fg); | |
7146a4f0 | 1128 | |
a4b1fab1 | 1129 | return tagptr_cast_ptr(tagptr_fold(tagptr1_t, q[JQ_SUBMIT], *fg)); |
7146a4f0 GX |
1130 | } |
1131 | ||
97e86a85 GX |
1132 | static void move_to_bypass_jobqueue(struct z_erofs_pcluster *pcl, |
1133 | z_erofs_next_pcluster_t qtail[], | |
1134 | z_erofs_next_pcluster_t owned_head) | |
7146a4f0 | 1135 | { |
97e86a85 GX |
1136 | z_erofs_next_pcluster_t *const submit_qtail = qtail[JQ_SUBMIT]; |
1137 | z_erofs_next_pcluster_t *const bypass_qtail = qtail[JQ_BYPASS]; | |
7146a4f0 | 1138 | |
97e86a85 GX |
1139 | DBG_BUGON(owned_head == Z_EROFS_PCLUSTER_TAIL_CLOSED); |
1140 | if (owned_head == Z_EROFS_PCLUSTER_TAIL) | |
1141 | owned_head = Z_EROFS_PCLUSTER_TAIL_CLOSED; | |
7146a4f0 | 1142 | |
97e86a85 | 1143 | WRITE_ONCE(pcl->next, Z_EROFS_PCLUSTER_TAIL_CLOSED); |
7146a4f0 GX |
1144 | |
1145 | WRITE_ONCE(*submit_qtail, owned_head); | |
97e86a85 | 1146 | WRITE_ONCE(*bypass_qtail, &pcl->next); |
7146a4f0 | 1147 | |
97e86a85 | 1148 | qtail[JQ_BYPASS] = &pcl->next; |
7146a4f0 GX |
1149 | } |
1150 | ||
1e4a2955 | 1151 | static void z_erofs_submit_queue(struct super_block *sb, |
0c638f70 GX |
1152 | z_erofs_next_pcluster_t owned_head, |
1153 | struct list_head *pagepool, | |
1154 | struct z_erofs_decompressqueue *fgq, | |
1155 | bool *force_fg) | |
3883a79a | 1156 | { |
bda17a45 | 1157 | struct erofs_sb_info *const sbi = EROFS_SB(sb); |
97e86a85 | 1158 | z_erofs_next_pcluster_t qtail[NR_JOBQUEUES]; |
a4b1fab1 | 1159 | struct z_erofs_decompressqueue *q[NR_JOBQUEUES]; |
7146a4f0 | 1160 | void *bi_private; |
3883a79a GX |
1161 | /* since bio will be NULL, no need to initialize last_index */ |
1162 | pgoff_t uninitialized_var(last_index); | |
1e4a2955 GX |
1163 | unsigned int nr_bios = 0; |
1164 | struct bio *bio = NULL; | |
3883a79a | 1165 | |
a4b1fab1 GX |
1166 | bi_private = jobqueueset_init(sb, q, fgq, force_fg); |
1167 | qtail[JQ_BYPASS] = &q[JQ_BYPASS]->head; | |
1168 | qtail[JQ_SUBMIT] = &q[JQ_SUBMIT]->head; | |
3883a79a GX |
1169 | |
1170 | /* by default, all need io submission */ | |
7146a4f0 | 1171 | q[JQ_SUBMIT]->head = owned_head; |
3883a79a GX |
1172 | |
1173 | do { | |
97e86a85 | 1174 | struct z_erofs_pcluster *pcl; |
1e4a2955 GX |
1175 | pgoff_t cur, end; |
1176 | unsigned int i = 0; | |
1177 | bool bypass = true; | |
3883a79a GX |
1178 | |
1179 | /* no possible 'owned_head' equals the following */ | |
97e86a85 GX |
1180 | DBG_BUGON(owned_head == Z_EROFS_PCLUSTER_TAIL_CLOSED); |
1181 | DBG_BUGON(owned_head == Z_EROFS_PCLUSTER_NIL); | |
1182 | ||
1183 | pcl = container_of(owned_head, struct z_erofs_pcluster, next); | |
3883a79a | 1184 | |
1e4a2955 GX |
1185 | cur = pcl->obj.index; |
1186 | end = cur + BIT(pcl->clusterbits); | |
3883a79a GX |
1187 | |
1188 | /* close the main owned chain at first */ | |
97e86a85 GX |
1189 | owned_head = cmpxchg(&pcl->next, Z_EROFS_PCLUSTER_TAIL, |
1190 | Z_EROFS_PCLUSTER_TAIL_CLOSED); | |
3883a79a | 1191 | |
1e4a2955 GX |
1192 | do { |
1193 | struct page *page; | |
1194 | int err; | |
3883a79a | 1195 | |
1e4a2955 GX |
1196 | page = pickup_page_for_submission(pcl, i++, pagepool, |
1197 | MNGD_MAPPING(sbi), | |
1198 | GFP_NOFS); | |
1199 | if (!page) | |
1200 | continue; | |
3883a79a | 1201 | |
1e4a2955 | 1202 | if (bio && cur != last_index + 1) { |
3883a79a | 1203 | submit_bio_retry: |
1e4a2955 GX |
1204 | submit_bio(bio); |
1205 | bio = NULL; | |
1206 | } | |
a5c0b780 | 1207 | |
1e4a2955 GX |
1208 | if (!bio) { |
1209 | bio = bio_alloc(GFP_NOIO, BIO_MAX_PAGES); | |
94e4e153 | 1210 | |
1e4a2955 GX |
1211 | bio->bi_end_io = z_erofs_decompressqueue_endio; |
1212 | bio_set_dev(bio, sb->s_bdev); | |
1213 | bio->bi_iter.bi_sector = (sector_t)cur << | |
1214 | LOG_SECTORS_PER_BLOCK; | |
1215 | bio->bi_private = bi_private; | |
1216 | bio->bi_opf = REQ_OP_READ; | |
1217 | ++nr_bios; | |
1218 | } | |
3883a79a | 1219 | |
1e4a2955 GX |
1220 | err = bio_add_page(bio, page, PAGE_SIZE, 0); |
1221 | if (err < PAGE_SIZE) | |
1222 | goto submit_bio_retry; | |
3883a79a | 1223 | |
1e4a2955 GX |
1224 | last_index = cur; |
1225 | bypass = false; | |
1226 | } while (++cur < end); | |
105d4ad8 | 1227 | |
1e4a2955 | 1228 | if (!bypass) |
97e86a85 | 1229 | qtail[JQ_SUBMIT] = &pcl->next; |
7146a4f0 | 1230 | else |
97e86a85 GX |
1231 | move_to_bypass_jobqueue(pcl, qtail, owned_head); |
1232 | } while (owned_head != Z_EROFS_PCLUSTER_TAIL); | |
3883a79a | 1233 | |
42d40b4a | 1234 | if (bio) |
94e4e153 | 1235 | submit_bio(bio); |
3883a79a | 1236 | |
587a67b7 GX |
1237 | /* |
1238 | * although background is preferred, no one is pending for submission. | |
1239 | * don't issue workqueue for decompression but drop it directly instead. | |
1240 | */ | |
1241 | if (!*force_fg && !nr_bios) { | |
1242 | kvfree(q[JQ_SUBMIT]); | |
1e4a2955 | 1243 | return; |
587a67b7 | 1244 | } |
a4b1fab1 | 1245 | z_erofs_decompress_kickoff(q[JQ_SUBMIT], *force_fg, nr_bios); |
3883a79a GX |
1246 | } |
1247 | ||
0c638f70 GX |
1248 | static void z_erofs_runqueue(struct super_block *sb, |
1249 | struct z_erofs_collector *clt, | |
1250 | struct list_head *pagepool, bool force_fg) | |
3883a79a | 1251 | { |
a4b1fab1 | 1252 | struct z_erofs_decompressqueue io[NR_JOBQUEUES]; |
3883a79a | 1253 | |
1e4a2955 | 1254 | if (clt->owned_head == Z_EROFS_PCLUSTER_TAIL) |
3883a79a | 1255 | return; |
1e4a2955 | 1256 | z_erofs_submit_queue(sb, clt->owned_head, pagepool, io, &force_fg); |
3883a79a | 1257 | |
0c638f70 GX |
1258 | /* handle bypass queue (no i/o pclusters) immediately */ |
1259 | z_erofs_decompress_queue(&io[JQ_BYPASS], pagepool); | |
4279f3f9 | 1260 | |
3883a79a GX |
1261 | if (!force_fg) |
1262 | return; | |
1263 | ||
1264 | /* wait until all bios are completed */ | |
a93f8c36 GX |
1265 | io_wait_event(io[JQ_SUBMIT].u.wait, |
1266 | !atomic_read(&io[JQ_SUBMIT].pending_bios)); | |
3883a79a | 1267 | |
0c638f70 GX |
1268 | /* handle synchronous decompress queue in the caller context */ |
1269 | z_erofs_decompress_queue(&io[JQ_SUBMIT], pagepool); | |
3883a79a GX |
1270 | } |
1271 | ||
0c638f70 | 1272 | static int z_erofs_readpage(struct file *file, struct page *page) |
3883a79a GX |
1273 | { |
1274 | struct inode *const inode = page->mapping->host; | |
97e86a85 | 1275 | struct z_erofs_decompress_frontend f = DECOMPRESS_FRONTEND_INIT(inode); |
3883a79a GX |
1276 | int err; |
1277 | LIST_HEAD(pagepool); | |
1278 | ||
ba9ce771 GX |
1279 | trace_erofs_readpage(page, false); |
1280 | ||
f0c519fc GX |
1281 | f.headoffset = (erofs_off_t)page->index << PAGE_SHIFT; |
1282 | ||
3883a79a | 1283 | err = z_erofs_do_read_page(&f, page, &pagepool); |
97e86a85 | 1284 | (void)z_erofs_collector_end(&f.clt); |
3883a79a | 1285 | |
ee45197c | 1286 | /* if some compressed cluster ready, need submit them anyway */ |
0c638f70 | 1287 | z_erofs_runqueue(inode->i_sb, &f.clt, &pagepool, true); |
ee45197c GX |
1288 | |
1289 | if (err) | |
4f761fa2 | 1290 | erofs_err(inode->i_sb, "failed to read, err [%d]", err); |
3883a79a | 1291 | |
3b423417 CY |
1292 | if (f.map.mpage) |
1293 | put_page(f.map.mpage); | |
3883a79a GX |
1294 | |
1295 | /* clean up the remaining free pages */ | |
1296 | put_pages_list(&pagepool); | |
ee45197c | 1297 | return err; |
3883a79a GX |
1298 | } |
1299 | ||
14f362b4 GX |
1300 | static bool should_decompress_synchronously(struct erofs_sb_info *sbi, |
1301 | unsigned int nr) | |
1302 | { | |
1303 | return nr <= sbi->max_sync_decompress_pages; | |
1304 | } | |
1305 | ||
0c638f70 GX |
1306 | static int z_erofs_readpages(struct file *filp, struct address_space *mapping, |
1307 | struct list_head *pages, unsigned int nr_pages) | |
3883a79a GX |
1308 | { |
1309 | struct inode *const inode = mapping->host; | |
5fb76bb0 | 1310 | struct erofs_sb_info *const sbi = EROFS_I_SB(inode); |
3883a79a | 1311 | |
14f362b4 | 1312 | bool sync = should_decompress_synchronously(sbi, nr_pages); |
97e86a85 | 1313 | struct z_erofs_decompress_frontend f = DECOMPRESS_FRONTEND_INIT(inode); |
3883a79a GX |
1314 | gfp_t gfp = mapping_gfp_constraint(mapping, GFP_KERNEL); |
1315 | struct page *head = NULL; | |
1316 | LIST_HEAD(pagepool); | |
1317 | ||
284db12c CG |
1318 | trace_erofs_readpages(mapping->host, lru_to_page(pages), |
1319 | nr_pages, false); | |
1320 | ||
f0c519fc GX |
1321 | f.headoffset = (erofs_off_t)lru_to_page(pages)->index << PAGE_SHIFT; |
1322 | ||
3883a79a GX |
1323 | for (; nr_pages; --nr_pages) { |
1324 | struct page *page = lru_to_page(pages); | |
1325 | ||
1326 | prefetchw(&page->flags); | |
1327 | list_del(&page->lru); | |
1328 | ||
2d9b5dcd GX |
1329 | /* |
1330 | * A pure asynchronous readahead is indicated if | |
1331 | * a PG_readahead marked page is hitted at first. | |
1332 | * Let's also do asynchronous decompression for this case. | |
1333 | */ | |
1334 | sync &= !(PageReadahead(page) && !head); | |
1335 | ||
3883a79a GX |
1336 | if (add_to_page_cache_lru(page, mapping, page->index, gfp)) { |
1337 | list_add(&page->lru, &pagepool); | |
1338 | continue; | |
1339 | } | |
1340 | ||
3883a79a GX |
1341 | set_page_private(page, (unsigned long)head); |
1342 | head = page; | |
1343 | } | |
1344 | ||
42d40b4a | 1345 | while (head) { |
3883a79a GX |
1346 | struct page *page = head; |
1347 | int err; | |
1348 | ||
1349 | /* traversal in reverse order */ | |
1350 | head = (void *)page_private(page); | |
1351 | ||
1352 | err = z_erofs_do_read_page(&f, page, &pagepool); | |
a5876e24 | 1353 | if (err) |
4f761fa2 GX |
1354 | erofs_err(inode->i_sb, |
1355 | "readahead error at page %lu @ nid %llu", | |
1356 | page->index, EROFS_I(inode)->nid); | |
3883a79a GX |
1357 | put_page(page); |
1358 | } | |
1359 | ||
97e86a85 | 1360 | (void)z_erofs_collector_end(&f.clt); |
3883a79a | 1361 | |
0c638f70 | 1362 | z_erofs_runqueue(inode->i_sb, &f.clt, &pagepool, sync); |
3883a79a | 1363 | |
3b423417 CY |
1364 | if (f.map.mpage) |
1365 | put_page(f.map.mpage); | |
3883a79a GX |
1366 | |
1367 | /* clean up the remaining free pages */ | |
1368 | put_pages_list(&pagepool); | |
1369 | return 0; | |
1370 | } | |
1371 | ||
0c638f70 GX |
1372 | const struct address_space_operations z_erofs_aops = { |
1373 | .readpage = z_erofs_readpage, | |
1374 | .readpages = z_erofs_readpages, | |
3883a79a | 1375 | }; |
02827e17 | 1376 |