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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * linux/mm/page_io.c | |
4 | * | |
5 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds | |
6 | * | |
7 | * Swap reorganised 29.12.95, | |
8 | * Asynchronous swapping added 30.12.95. Stephen Tweedie | |
9 | * Removed race in async swapping. 14.4.1996. Bruno Haible | |
10 | * Add swap of shared pages through the page cache. 20.2.1998. Stephen Tweedie | |
11 | * Always use brw_page, life becomes simpler. 12 May 1998 Eric Biederman | |
12 | */ | |
13 | ||
14 | #include <linux/mm.h> | |
15 | #include <linux/kernel_stat.h> | |
5a0e3ad6 | 16 | #include <linux/gfp.h> |
1da177e4 LT |
17 | #include <linux/pagemap.h> |
18 | #include <linux/swap.h> | |
19 | #include <linux/bio.h> | |
20 | #include <linux/swapops.h> | |
21 | #include <linux/writeback.h> | |
38b5faf4 | 22 | #include <linux/frontswap.h> |
b430e9d1 | 23 | #include <linux/blkdev.h> |
93779069 | 24 | #include <linux/psi.h> |
e2e40f2c | 25 | #include <linux/uio.h> |
b0ba2d0f | 26 | #include <linux/sched/task.h> |
a3d5dc90 | 27 | #include <linux/delayacct.h> |
014bb1de | 28 | #include "swap.h" |
1da177e4 | 29 | |
cf1e3fe4 | 30 | static void end_swap_bio_write(struct bio *bio) |
1da177e4 | 31 | { |
263663cd | 32 | struct page *page = bio_first_page_all(bio); |
1da177e4 | 33 | |
4e4cbee9 | 34 | if (bio->bi_status) { |
1da177e4 | 35 | SetPageError(page); |
6ddab3b9 PZ |
36 | /* |
37 | * We failed to write the page out to swap-space. | |
38 | * Re-dirty the page in order to avoid it being reclaimed. | |
39 | * Also print a dire warning that things will go BAD (tm) | |
40 | * very quickly. | |
41 | * | |
575ced1c | 42 | * Also clear PG_reclaim to avoid folio_rotate_reclaimable() |
6ddab3b9 PZ |
43 | */ |
44 | set_page_dirty(page); | |
25eaab43 GD |
45 | pr_alert_ratelimited("Write-error on swap-device (%u:%u:%llu)\n", |
46 | MAJOR(bio_dev(bio)), MINOR(bio_dev(bio)), | |
47 | (unsigned long long)bio->bi_iter.bi_sector); | |
6ddab3b9 PZ |
48 | ClearPageReclaim(page); |
49 | } | |
1da177e4 LT |
50 | end_page_writeback(page); |
51 | bio_put(bio); | |
1da177e4 LT |
52 | } |
53 | ||
9b4e30bd | 54 | static void __end_swap_bio_read(struct bio *bio) |
1da177e4 | 55 | { |
263663cd | 56 | struct page *page = bio_first_page_all(bio); |
1da177e4 | 57 | |
4e4cbee9 | 58 | if (bio->bi_status) { |
1da177e4 LT |
59 | SetPageError(page); |
60 | ClearPageUptodate(page); | |
25eaab43 GD |
61 | pr_alert_ratelimited("Read-error on swap-device (%u:%u:%llu)\n", |
62 | MAJOR(bio_dev(bio)), MINOR(bio_dev(bio)), | |
63 | (unsigned long long)bio->bi_iter.bi_sector); | |
9b4e30bd CH |
64 | } else { |
65 | SetPageUptodate(page); | |
1da177e4 LT |
66 | } |
67 | unlock_page(page); | |
9b4e30bd CH |
68 | } |
69 | ||
70 | static void end_swap_bio_read(struct bio *bio) | |
71 | { | |
72 | __end_swap_bio_read(bio); | |
1da177e4 | 73 | bio_put(bio); |
1da177e4 LT |
74 | } |
75 | ||
a509bc1a MG |
76 | int generic_swapfile_activate(struct swap_info_struct *sis, |
77 | struct file *swap_file, | |
78 | sector_t *span) | |
79 | { | |
80 | struct address_space *mapping = swap_file->f_mapping; | |
81 | struct inode *inode = mapping->host; | |
82 | unsigned blocks_per_page; | |
83 | unsigned long page_no; | |
84 | unsigned blkbits; | |
85 | sector_t probe_block; | |
86 | sector_t last_block; | |
87 | sector_t lowest_block = -1; | |
88 | sector_t highest_block = 0; | |
89 | int nr_extents = 0; | |
90 | int ret; | |
91 | ||
92 | blkbits = inode->i_blkbits; | |
93 | blocks_per_page = PAGE_SIZE >> blkbits; | |
94 | ||
95 | /* | |
4efaceb1 | 96 | * Map all the blocks into the extent tree. This code doesn't try |
a509bc1a MG |
97 | * to be very smart. |
98 | */ | |
99 | probe_block = 0; | |
100 | page_no = 0; | |
101 | last_block = i_size_read(inode) >> blkbits; | |
102 | while ((probe_block + blocks_per_page) <= last_block && | |
103 | page_no < sis->max) { | |
104 | unsigned block_in_page; | |
105 | sector_t first_block; | |
106 | ||
7e4411bf MP |
107 | cond_resched(); |
108 | ||
30460e1e CM |
109 | first_block = probe_block; |
110 | ret = bmap(inode, &first_block); | |
111 | if (ret || !first_block) | |
a509bc1a MG |
112 | goto bad_bmap; |
113 | ||
114 | /* | |
115 | * It must be PAGE_SIZE aligned on-disk | |
116 | */ | |
117 | if (first_block & (blocks_per_page - 1)) { | |
118 | probe_block++; | |
119 | goto reprobe; | |
120 | } | |
121 | ||
122 | for (block_in_page = 1; block_in_page < blocks_per_page; | |
123 | block_in_page++) { | |
124 | sector_t block; | |
125 | ||
30460e1e CM |
126 | block = probe_block + block_in_page; |
127 | ret = bmap(inode, &block); | |
128 | if (ret || !block) | |
a509bc1a | 129 | goto bad_bmap; |
30460e1e | 130 | |
a509bc1a MG |
131 | if (block != first_block + block_in_page) { |
132 | /* Discontiguity */ | |
133 | probe_block++; | |
134 | goto reprobe; | |
135 | } | |
136 | } | |
137 | ||
138 | first_block >>= (PAGE_SHIFT - blkbits); | |
139 | if (page_no) { /* exclude the header page */ | |
140 | if (first_block < lowest_block) | |
141 | lowest_block = first_block; | |
142 | if (first_block > highest_block) | |
143 | highest_block = first_block; | |
144 | } | |
145 | ||
146 | /* | |
147 | * We found a PAGE_SIZE-length, PAGE_SIZE-aligned run of blocks | |
148 | */ | |
149 | ret = add_swap_extent(sis, page_no, 1, first_block); | |
150 | if (ret < 0) | |
151 | goto out; | |
152 | nr_extents += ret; | |
153 | page_no++; | |
154 | probe_block += blocks_per_page; | |
155 | reprobe: | |
156 | continue; | |
157 | } | |
158 | ret = nr_extents; | |
159 | *span = 1 + highest_block - lowest_block; | |
160 | if (page_no == 0) | |
161 | page_no = 1; /* force Empty message */ | |
162 | sis->max = page_no; | |
163 | sis->pages = page_no - 1; | |
164 | sis->highest_bit = page_no - 1; | |
165 | out: | |
166 | return ret; | |
167 | bad_bmap: | |
1170532b | 168 | pr_err("swapon: swapfile has holes\n"); |
a509bc1a MG |
169 | ret = -EINVAL; |
170 | goto out; | |
171 | } | |
172 | ||
1da177e4 LT |
173 | /* |
174 | * We may have stale swap cache pages in memory: notice | |
175 | * them here and get rid of the unnecessary final write. | |
176 | */ | |
177 | int swap_writepage(struct page *page, struct writeback_control *wbc) | |
178 | { | |
71fa1a53 | 179 | struct folio *folio = page_folio(page); |
e3e2762b | 180 | int ret; |
1da177e4 | 181 | |
71fa1a53 MWO |
182 | if (folio_free_swap(folio)) { |
183 | folio_unlock(folio); | |
e3e2762b | 184 | return 0; |
1da177e4 | 185 | } |
8a84802e SP |
186 | /* |
187 | * Arch code may have to preserve more data than just the page | |
188 | * contents, e.g. memory tags. | |
189 | */ | |
71fa1a53 | 190 | ret = arch_prepare_to_swap(&folio->page); |
8a84802e | 191 | if (ret) { |
71fa1a53 MWO |
192 | folio_mark_dirty(folio); |
193 | folio_unlock(folio); | |
e3e2762b | 194 | return ret; |
8a84802e | 195 | } |
71fa1a53 MWO |
196 | if (frontswap_store(&folio->page) == 0) { |
197 | folio_start_writeback(folio); | |
198 | folio_unlock(folio); | |
199 | folio_end_writeback(folio); | |
e3e2762b | 200 | return 0; |
38b5faf4 | 201 | } |
e3e2762b CH |
202 | __swap_writepage(&folio->page, wbc); |
203 | return 0; | |
2f772e6c SJ |
204 | } |
205 | ||
225311a4 HY |
206 | static inline void count_swpout_vm_event(struct page *page) |
207 | { | |
208 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
209 | if (unlikely(PageTransHuge(page))) | |
210 | count_vm_event(THP_SWPOUT); | |
211 | #endif | |
6c357848 | 212 | count_vm_events(PSWPOUT, thp_nr_pages(page)); |
225311a4 HY |
213 | } |
214 | ||
a18b9b15 CH |
215 | #if defined(CONFIG_MEMCG) && defined(CONFIG_BLK_CGROUP) |
216 | static void bio_associate_blkg_from_page(struct bio *bio, struct page *page) | |
217 | { | |
218 | struct cgroup_subsys_state *css; | |
bcfe06bf | 219 | struct mem_cgroup *memcg; |
a18b9b15 | 220 | |
bcfe06bf RG |
221 | memcg = page_memcg(page); |
222 | if (!memcg) | |
a18b9b15 CH |
223 | return; |
224 | ||
225 | rcu_read_lock(); | |
bcfe06bf | 226 | css = cgroup_e_css(memcg->css.cgroup, &io_cgrp_subsys); |
a18b9b15 CH |
227 | bio_associate_blkg_from_css(bio, css); |
228 | rcu_read_unlock(); | |
229 | } | |
230 | #else | |
231 | #define bio_associate_blkg_from_page(bio, page) do { } while (0) | |
232 | #endif /* CONFIG_MEMCG && CONFIG_BLK_CGROUP */ | |
233 | ||
e1209d3a N |
234 | struct swap_iocb { |
235 | struct kiocb iocb; | |
5169b844 N |
236 | struct bio_vec bvec[SWAP_CLUSTER_MAX]; |
237 | int pages; | |
a1a0dfd5 | 238 | int len; |
e1209d3a N |
239 | }; |
240 | static mempool_t *sio_pool; | |
241 | ||
242 | int sio_pool_init(void) | |
2f772e6c | 243 | { |
e1209d3a N |
244 | if (!sio_pool) { |
245 | mempool_t *pool = mempool_create_kmalloc_pool( | |
246 | SWAP_CLUSTER_MAX, sizeof(struct swap_iocb)); | |
247 | if (cmpxchg(&sio_pool, NULL, pool)) | |
248 | mempool_destroy(pool); | |
249 | } | |
250 | if (!sio_pool) | |
251 | return -ENOMEM; | |
252 | return 0; | |
253 | } | |
62c230bc | 254 | |
7eadabc0 N |
255 | static void sio_write_complete(struct kiocb *iocb, long ret) |
256 | { | |
257 | struct swap_iocb *sio = container_of(iocb, struct swap_iocb, iocb); | |
5169b844 | 258 | struct page *page = sio->bvec[0].bv_page; |
2282679f | 259 | int p; |
62c230bc | 260 | |
a1a0dfd5 | 261 | if (ret != sio->len) { |
7eadabc0 N |
262 | /* |
263 | * In the case of swap-over-nfs, this can be a | |
264 | * temporary failure if the system has limited | |
265 | * memory for allocating transmit buffers. | |
266 | * Mark the page dirty and avoid | |
267 | * folio_rotate_reclaimable but rate-limit the | |
268 | * messages but do not flag PageError like | |
269 | * the normal direct-to-bio case as it could | |
270 | * be temporary. | |
271 | */ | |
7eadabc0 N |
272 | pr_err_ratelimited("Write error %ld on dio swapfile (%llu)\n", |
273 | ret, page_file_offset(page)); | |
2282679f N |
274 | for (p = 0; p < sio->pages; p++) { |
275 | page = sio->bvec[p].bv_page; | |
2d30d31e | 276 | set_page_dirty(page); |
0cdc444a | 277 | ClearPageReclaim(page); |
62c230bc | 278 | } |
6341a446 N |
279 | } else { |
280 | for (p = 0; p < sio->pages; p++) | |
281 | count_swpout_vm_event(sio->bvec[p].bv_page); | |
62c230bc MG |
282 | } |
283 | ||
2282679f N |
284 | for (p = 0; p < sio->pages; p++) |
285 | end_page_writeback(sio->bvec[p].bv_page); | |
286 | ||
7eadabc0 N |
287 | mempool_free(sio, sio_pool); |
288 | } | |
289 | ||
e3e2762b | 290 | static void swap_writepage_fs(struct page *page, struct writeback_control *wbc) |
7eadabc0 | 291 | { |
2282679f | 292 | struct swap_iocb *sio = NULL; |
7eadabc0 N |
293 | struct swap_info_struct *sis = page_swap_info(page); |
294 | struct file *swap_file = sis->swap_file; | |
2282679f | 295 | loff_t pos = page_file_offset(page); |
7eadabc0 N |
296 | |
297 | set_page_writeback(page); | |
298 | unlock_page(page); | |
2282679f N |
299 | if (wbc->swap_plug) |
300 | sio = *wbc->swap_plug; | |
301 | if (sio) { | |
302 | if (sio->iocb.ki_filp != swap_file || | |
a1a0dfd5 | 303 | sio->iocb.ki_pos + sio->len != pos) { |
2282679f N |
304 | swap_write_unplug(sio); |
305 | sio = NULL; | |
306 | } | |
307 | } | |
308 | if (!sio) { | |
309 | sio = mempool_alloc(sio_pool, GFP_NOIO); | |
310 | init_sync_kiocb(&sio->iocb, swap_file); | |
311 | sio->iocb.ki_complete = sio_write_complete; | |
312 | sio->iocb.ki_pos = pos; | |
313 | sio->pages = 0; | |
a1a0dfd5 | 314 | sio->len = 0; |
2282679f N |
315 | } |
316 | sio->bvec[sio->pages].bv_page = page; | |
a1a0dfd5 | 317 | sio->bvec[sio->pages].bv_len = thp_size(page); |
2282679f | 318 | sio->bvec[sio->pages].bv_offset = 0; |
a1a0dfd5 | 319 | sio->len += thp_size(page); |
2282679f N |
320 | sio->pages += 1; |
321 | if (sio->pages == ARRAY_SIZE(sio->bvec) || !wbc->swap_plug) { | |
322 | swap_write_unplug(sio); | |
323 | sio = NULL; | |
324 | } | |
325 | if (wbc->swap_plug) | |
326 | *wbc->swap_plug = sio; | |
7eadabc0 N |
327 | } |
328 | ||
e3e2762b | 329 | void __swap_writepage(struct page *page, struct writeback_control *wbc) |
2f772e6c SJ |
330 | { |
331 | struct bio *bio; | |
4e49ea4a | 332 | int ret; |
2f772e6c | 333 | struct swap_info_struct *sis = page_swap_info(page); |
62c230bc | 334 | |
cc30c5d6 | 335 | VM_BUG_ON_PAGE(!PageSwapCache(page), page); |
7eadabc0 N |
336 | /* |
337 | * ->flags can be updated non-atomicially (scan_swap_map_slots), | |
338 | * but that will never affect SWP_FS_OPS, so the data_race | |
339 | * is safe. | |
340 | */ | |
341 | if (data_race(sis->flags & SWP_FS_OPS)) | |
342 | return swap_writepage_fs(page, wbc); | |
62c230bc | 343 | |
dd6bd0d9 MW |
344 | ret = bdev_write_page(sis->bdev, swap_page_sector(page), page, wbc); |
345 | if (!ret) { | |
225311a4 | 346 | count_swpout_vm_event(page); |
e3e2762b | 347 | return; |
dd6bd0d9 MW |
348 | } |
349 | ||
07888c66 CH |
350 | bio = bio_alloc(sis->bdev, 1, |
351 | REQ_OP_WRITE | REQ_SWAP | wbc_to_write_flags(wbc), | |
352 | GFP_NOIO); | |
48d15436 | 353 | bio->bi_iter.bi_sector = swap_page_sector(page); |
cf1e3fe4 | 354 | bio->bi_end_io = end_swap_bio_write; |
48d15436 CH |
355 | bio_add_page(bio, page, thp_size(page), 0); |
356 | ||
6a7f6d86 | 357 | bio_associate_blkg_from_page(bio, page); |
225311a4 | 358 | count_swpout_vm_event(page); |
1da177e4 LT |
359 | set_page_writeback(page); |
360 | unlock_page(page); | |
4e49ea4a | 361 | submit_bio(bio); |
1da177e4 LT |
362 | } |
363 | ||
2282679f N |
364 | void swap_write_unplug(struct swap_iocb *sio) |
365 | { | |
366 | struct iov_iter from; | |
367 | struct address_space *mapping = sio->iocb.ki_filp->f_mapping; | |
368 | int ret; | |
369 | ||
de4eda9d | 370 | iov_iter_bvec(&from, ITER_SOURCE, sio->bvec, sio->pages, sio->len); |
2282679f N |
371 | ret = mapping->a_ops->swap_rw(&sio->iocb, &from); |
372 | if (ret != -EIOCBQUEUED) | |
373 | sio_write_complete(&sio->iocb, ret); | |
374 | } | |
375 | ||
e1209d3a N |
376 | static void sio_read_complete(struct kiocb *iocb, long ret) |
377 | { | |
378 | struct swap_iocb *sio = container_of(iocb, struct swap_iocb, iocb); | |
5169b844 | 379 | int p; |
e1209d3a | 380 | |
a1a0dfd5 | 381 | if (ret == sio->len) { |
5169b844 N |
382 | for (p = 0; p < sio->pages; p++) { |
383 | struct page *page = sio->bvec[p].bv_page; | |
384 | ||
385 | SetPageUptodate(page); | |
386 | unlock_page(page); | |
387 | } | |
388 | count_vm_events(PSWPIN, sio->pages); | |
e1209d3a | 389 | } else { |
5169b844 N |
390 | for (p = 0; p < sio->pages; p++) { |
391 | struct page *page = sio->bvec[p].bv_page; | |
392 | ||
393 | SetPageError(page); | |
394 | ClearPageUptodate(page); | |
395 | unlock_page(page); | |
396 | } | |
397 | pr_alert_ratelimited("Read-error on swap-device\n"); | |
e1209d3a | 398 | } |
e1209d3a N |
399 | mempool_free(sio, sio_pool); |
400 | } | |
401 | ||
5169b844 N |
402 | static void swap_readpage_fs(struct page *page, |
403 | struct swap_iocb **plug) | |
e1209d3a N |
404 | { |
405 | struct swap_info_struct *sis = page_swap_info(page); | |
5169b844 | 406 | struct swap_iocb *sio = NULL; |
e1209d3a | 407 | loff_t pos = page_file_offset(page); |
e1209d3a | 408 | |
5169b844 N |
409 | if (plug) |
410 | sio = *plug; | |
411 | if (sio) { | |
412 | if (sio->iocb.ki_filp != sis->swap_file || | |
a1a0dfd5 | 413 | sio->iocb.ki_pos + sio->len != pos) { |
5169b844 N |
414 | swap_read_unplug(sio); |
415 | sio = NULL; | |
416 | } | |
417 | } | |
418 | if (!sio) { | |
419 | sio = mempool_alloc(sio_pool, GFP_KERNEL); | |
420 | init_sync_kiocb(&sio->iocb, sis->swap_file); | |
421 | sio->iocb.ki_pos = pos; | |
422 | sio->iocb.ki_complete = sio_read_complete; | |
423 | sio->pages = 0; | |
a1a0dfd5 | 424 | sio->len = 0; |
5169b844 N |
425 | } |
426 | sio->bvec[sio->pages].bv_page = page; | |
a1a0dfd5 | 427 | sio->bvec[sio->pages].bv_len = thp_size(page); |
5169b844 | 428 | sio->bvec[sio->pages].bv_offset = 0; |
a1a0dfd5 | 429 | sio->len += thp_size(page); |
5169b844 N |
430 | sio->pages += 1; |
431 | if (sio->pages == ARRAY_SIZE(sio->bvec) || !plug) { | |
432 | swap_read_unplug(sio); | |
433 | sio = NULL; | |
434 | } | |
435 | if (plug) | |
436 | *plug = sio; | |
e1209d3a N |
437 | } |
438 | ||
9b4e30bd | 439 | static void swap_readpage_bdev_sync(struct page *page, |
14bd75f5 | 440 | struct swap_info_struct *sis) |
1da177e4 | 441 | { |
9b4e30bd CH |
442 | struct bio_vec bv; |
443 | struct bio bio; | |
62c230bc | 444 | |
a8c1408f CH |
445 | if ((sis->flags & SWP_SYNCHRONOUS_IO) && |
446 | !bdev_read_page(sis->bdev, swap_page_sector(page), page)) { | |
447 | count_vm_event(PSWPIN); | |
14bd75f5 | 448 | return; |
dd6bd0d9 MW |
449 | } |
450 | ||
9b4e30bd CH |
451 | bio_init(&bio, sis->bdev, &bv, 1, REQ_OP_READ); |
452 | bio.bi_iter.bi_sector = swap_page_sector(page); | |
453 | bio_add_page(&bio, page, thp_size(page), 0); | |
b0ba2d0f TH |
454 | /* |
455 | * Keep this task valid during swap readpage because the oom killer may | |
456 | * attempt to access it in the page fault retry time check. | |
457 | */ | |
9b4e30bd | 458 | get_task_struct(current); |
f8891e5e | 459 | count_vm_event(PSWPIN); |
9b4e30bd CH |
460 | submit_bio_wait(&bio); |
461 | __end_swap_bio_read(&bio); | |
462 | put_task_struct(current); | |
463 | } | |
464 | ||
465 | static void swap_readpage_bdev_async(struct page *page, | |
466 | struct swap_info_struct *sis) | |
467 | { | |
468 | struct bio *bio; | |
23955622 | 469 | |
9b4e30bd CH |
470 | if ((sis->flags & SWP_SYNCHRONOUS_IO) && |
471 | !bdev_read_page(sis->bdev, swap_page_sector(page), page)) { | |
472 | count_vm_event(PSWPIN); | |
473 | return; | |
23955622 | 474 | } |
9b4e30bd CH |
475 | |
476 | bio = bio_alloc(sis->bdev, 1, REQ_OP_READ, GFP_KERNEL); | |
477 | bio->bi_iter.bi_sector = swap_page_sector(page); | |
478 | bio->bi_end_io = end_swap_bio_read; | |
479 | bio_add_page(bio, page, thp_size(page), 0); | |
480 | count_vm_event(PSWPIN); | |
481 | submit_bio(bio); | |
14bd75f5 CH |
482 | } |
483 | ||
484 | void swap_readpage(struct page *page, bool synchronous, struct swap_iocb **plug) | |
485 | { | |
486 | struct swap_info_struct *sis = page_swap_info(page); | |
487 | bool workingset = PageWorkingset(page); | |
488 | unsigned long pflags; | |
489 | bool in_thrashing; | |
490 | ||
491 | VM_BUG_ON_PAGE(!PageSwapCache(page) && !synchronous, page); | |
492 | VM_BUG_ON_PAGE(!PageLocked(page), page); | |
493 | VM_BUG_ON_PAGE(PageUptodate(page), page); | |
494 | ||
495 | /* | |
496 | * Count submission time as memory stall and delay. When the device | |
497 | * is congested, or the submitting cgroup IO-throttled, submission | |
498 | * can be a significant part of overall IO time. | |
499 | */ | |
500 | if (workingset) { | |
501 | delayacct_thrashing_start(&in_thrashing); | |
502 | psi_memstall_enter(&pflags); | |
503 | } | |
504 | delayacct_swapin_start(); | |
505 | ||
506 | if (frontswap_load(page) == 0) { | |
507 | SetPageUptodate(page); | |
508 | unlock_page(page); | |
509 | } else if (data_race(sis->flags & SWP_FS_OPS)) { | |
510 | swap_readpage_fs(page, plug); | |
9b4e30bd CH |
511 | } else if (synchronous) { |
512 | swap_readpage_bdev_sync(page, sis); | |
14bd75f5 | 513 | } else { |
9b4e30bd | 514 | swap_readpage_bdev_async(page, sis); |
14bd75f5 | 515 | } |
23955622 | 516 | |
3a9bb7b1 YY |
517 | if (workingset) { |
518 | delayacct_thrashing_end(&in_thrashing); | |
d8c47cc7 | 519 | psi_memstall_leave(&pflags); |
3a9bb7b1 | 520 | } |
a3d5dc90 | 521 | delayacct_swapin_end(); |
1da177e4 | 522 | } |
62c230bc | 523 | |
5169b844 | 524 | void __swap_read_unplug(struct swap_iocb *sio) |
62c230bc | 525 | { |
5169b844 N |
526 | struct iov_iter from; |
527 | struct address_space *mapping = sio->iocb.ki_filp->f_mapping; | |
528 | int ret; | |
cc30c5d6 | 529 | |
de4eda9d | 530 | iov_iter_bvec(&from, ITER_DEST, sio->bvec, sio->pages, sio->len); |
5169b844 N |
531 | ret = mapping->a_ops->swap_rw(&sio->iocb, &from); |
532 | if (ret != -EIOCBQUEUED) | |
533 | sio_read_complete(&sio->iocb, ret); | |
62c230bc | 534 | } |