1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * f2fs compress support |
4 | * |
5 | * Copyright (c) 2019 Chao Yu <chao@kernel.org> |
6 | */ |
7 | |
8 | #include <linux/fs.h> |
9 | #include <linux/f2fs_fs.h> |
10 | #include <linux/moduleparam.h> |
11 | #include <linux/writeback.h> |
12 | #include <linux/backing-dev.h> |
13 | #include <linux/lzo.h> |
14 | #include <linux/lz4.h> |
15 | #include <linux/zstd.h> |
16 | #include <linux/pagevec.h> |
17 | |
18 | #include "f2fs.h" |
19 | #include "node.h" |
20 | #include "segment.h" |
21 | #include <trace/events/f2fs.h> |
22 | |
23 | static struct kmem_cache *cic_entry_slab; |
24 | static struct kmem_cache *dic_entry_slab; |
25 | |
26 | static void *page_array_alloc(struct inode *inode, int nr) |
27 | { |
28 | struct f2fs_sb_info *sbi = F2FS_I_SB(inode); |
29 | unsigned int size = sizeof(struct page *) * nr; |
30 | |
31 | if (likely(size <= sbi->page_array_slab_size)) |
32 | return f2fs_kmem_cache_alloc(cachep: sbi->page_array_slab, |
33 | GFP_F2FS_ZERO, nofail: false, sbi: F2FS_I_SB(inode)); |
34 | return f2fs_kzalloc(sbi, size, GFP_NOFS); |
35 | } |
36 | |
37 | static void page_array_free(struct inode *inode, void *pages, int nr) |
38 | { |
39 | struct f2fs_sb_info *sbi = F2FS_I_SB(inode); |
40 | unsigned int size = sizeof(struct page *) * nr; |
41 | |
42 | if (!pages) |
43 | return; |
44 | |
45 | if (likely(size <= sbi->page_array_slab_size)) |
46 | kmem_cache_free(s: sbi->page_array_slab, objp: pages); |
47 | else |
48 | kfree(objp: pages); |
49 | } |
50 | |
51 | struct f2fs_compress_ops { |
52 | int (*init_compress_ctx)(struct compress_ctx *cc); |
53 | void (*destroy_compress_ctx)(struct compress_ctx *cc); |
54 | int (*compress_pages)(struct compress_ctx *cc); |
55 | int (*init_decompress_ctx)(struct decompress_io_ctx *dic); |
56 | void (*destroy_decompress_ctx)(struct decompress_io_ctx *dic); |
57 | int (*decompress_pages)(struct decompress_io_ctx *dic); |
58 | bool (*is_level_valid)(int level); |
59 | }; |
60 | |
61 | static unsigned int offset_in_cluster(struct compress_ctx *cc, pgoff_t index) |
62 | { |
63 | return index & (cc->cluster_size - 1); |
64 | } |
65 | |
66 | static pgoff_t cluster_idx(struct compress_ctx *cc, pgoff_t index) |
67 | { |
68 | return index >> cc->log_cluster_size; |
69 | } |
70 | |
71 | static pgoff_t start_idx_of_cluster(struct compress_ctx *cc) |
72 | { |
73 | return cc->cluster_idx << cc->log_cluster_size; |
74 | } |
75 | |
76 | bool f2fs_is_compressed_page(struct page *page) |
77 | { |
78 | if (!PagePrivate(page)) |
79 | return false; |
80 | if (!page_private(page)) |
81 | return false; |
82 | if (page_private_nonpointer(page)) |
83 | return false; |
84 | |
85 | f2fs_bug_on(F2FS_M_SB(page->mapping), |
86 | *((u32 *)page_private(page)) != F2FS_COMPRESSED_PAGE_MAGIC); |
87 | return true; |
88 | } |
89 | |
90 | static void f2fs_set_compressed_page(struct page *page, |
91 | struct inode *inode, pgoff_t index, void *data) |
92 | { |
93 | attach_page_private(page, data: (void *)data); |
94 | |
95 | /* i_crypto_info and iv index */ |
96 | page->index = index; |
97 | page->mapping = inode->i_mapping; |
98 | } |
99 | |
100 | static void f2fs_drop_rpages(struct compress_ctx *cc, int len, bool unlock) |
101 | { |
102 | int i; |
103 | |
104 | for (i = 0; i < len; i++) { |
105 | if (!cc->rpages[i]) |
106 | continue; |
107 | if (unlock) |
108 | unlock_page(page: cc->rpages[i]); |
109 | else |
110 | put_page(page: cc->rpages[i]); |
111 | } |
112 | } |
113 | |
114 | static void f2fs_put_rpages(struct compress_ctx *cc) |
115 | { |
116 | f2fs_drop_rpages(cc, len: cc->cluster_size, unlock: false); |
117 | } |
118 | |
119 | static void f2fs_unlock_rpages(struct compress_ctx *cc, int len) |
120 | { |
121 | f2fs_drop_rpages(cc, len, unlock: true); |
122 | } |
123 | |
124 | static void f2fs_put_rpages_wbc(struct compress_ctx *cc, |
125 | struct writeback_control *wbc, bool redirty, int unlock) |
126 | { |
127 | unsigned int i; |
128 | |
129 | for (i = 0; i < cc->cluster_size; i++) { |
130 | if (!cc->rpages[i]) |
131 | continue; |
132 | if (redirty) |
133 | redirty_page_for_writepage(wbc, cc->rpages[i]); |
134 | f2fs_put_page(page: cc->rpages[i], unlock); |
135 | } |
136 | } |
137 | |
138 | struct page *f2fs_compress_control_page(struct page *page) |
139 | { |
140 | return ((struct compress_io_ctx *)page_private(page))->rpages[0]; |
141 | } |
142 | |
143 | int f2fs_init_compress_ctx(struct compress_ctx *cc) |
144 | { |
145 | if (cc->rpages) |
146 | return 0; |
147 | |
148 | cc->rpages = page_array_alloc(inode: cc->inode, nr: cc->cluster_size); |
149 | return cc->rpages ? 0 : -ENOMEM; |
150 | } |
151 | |
152 | void f2fs_destroy_compress_ctx(struct compress_ctx *cc, bool reuse) |
153 | { |
154 | page_array_free(inode: cc->inode, pages: cc->rpages, nr: cc->cluster_size); |
155 | cc->rpages = NULL; |
156 | cc->nr_rpages = 0; |
157 | cc->nr_cpages = 0; |
158 | cc->valid_nr_cpages = 0; |
159 | if (!reuse) |
160 | cc->cluster_idx = NULL_CLUSTER; |
161 | } |
162 | |
163 | void f2fs_compress_ctx_add_page(struct compress_ctx *cc, struct page *page) |
164 | { |
165 | unsigned int cluster_ofs; |
166 | |
167 | if (!f2fs_cluster_can_merge_page(cc, index: page->index)) |
168 | f2fs_bug_on(F2FS_I_SB(cc->inode), 1); |
169 | |
170 | cluster_ofs = offset_in_cluster(cc, index: page->index); |
171 | cc->rpages[cluster_ofs] = page; |
172 | cc->nr_rpages++; |
173 | cc->cluster_idx = cluster_idx(cc, index: page->index); |
174 | } |
175 | |
176 | #ifdef CONFIG_F2FS_FS_LZO |
177 | static int lzo_init_compress_ctx(struct compress_ctx *cc) |
178 | { |
179 | cc->private = f2fs_kvmalloc(sbi: F2FS_I_SB(inode: cc->inode), |
180 | LZO1X_MEM_COMPRESS, GFP_NOFS); |
181 | if (!cc->private) |
182 | return -ENOMEM; |
183 | |
184 | cc->clen = lzo1x_worst_compress(PAGE_SIZE << cc->log_cluster_size); |
185 | return 0; |
186 | } |
187 | |
188 | static void lzo_destroy_compress_ctx(struct compress_ctx *cc) |
189 | { |
190 | kvfree(addr: cc->private); |
191 | cc->private = NULL; |
192 | } |
193 | |
194 | static int lzo_compress_pages(struct compress_ctx *cc) |
195 | { |
196 | int ret; |
197 | |
198 | ret = lzo1x_1_compress(src: cc->rbuf, src_len: cc->rlen, dst: cc->cbuf->cdata, |
199 | dst_len: &cc->clen, wrkmem: cc->private); |
200 | if (ret != LZO_E_OK) { |
201 | printk_ratelimited("%sF2FS-fs (%s): lzo compress failed, ret:%d\n" , |
202 | KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id, ret); |
203 | return -EIO; |
204 | } |
205 | return 0; |
206 | } |
207 | |
208 | static int lzo_decompress_pages(struct decompress_io_ctx *dic) |
209 | { |
210 | int ret; |
211 | |
212 | ret = lzo1x_decompress_safe(src: dic->cbuf->cdata, src_len: dic->clen, |
213 | dst: dic->rbuf, dst_len: &dic->rlen); |
214 | if (ret != LZO_E_OK) { |
215 | printk_ratelimited("%sF2FS-fs (%s): lzo decompress failed, ret:%d\n" , |
216 | KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id, ret); |
217 | return -EIO; |
218 | } |
219 | |
220 | if (dic->rlen != PAGE_SIZE << dic->log_cluster_size) { |
221 | printk_ratelimited("%sF2FS-fs (%s): lzo invalid rlen:%zu, " |
222 | "expected:%lu\n" , KERN_ERR, |
223 | F2FS_I_SB(dic->inode)->sb->s_id, |
224 | dic->rlen, |
225 | PAGE_SIZE << dic->log_cluster_size); |
226 | return -EIO; |
227 | } |
228 | return 0; |
229 | } |
230 | |
231 | static const struct f2fs_compress_ops f2fs_lzo_ops = { |
232 | .init_compress_ctx = lzo_init_compress_ctx, |
233 | .destroy_compress_ctx = lzo_destroy_compress_ctx, |
234 | .compress_pages = lzo_compress_pages, |
235 | .decompress_pages = lzo_decompress_pages, |
236 | }; |
237 | #endif |
238 | |
239 | #ifdef CONFIG_F2FS_FS_LZ4 |
240 | static int lz4_init_compress_ctx(struct compress_ctx *cc) |
241 | { |
242 | unsigned int size = LZ4_MEM_COMPRESS; |
243 | |
244 | #ifdef CONFIG_F2FS_FS_LZ4HC |
245 | if (F2FS_I(inode: cc->inode)->i_compress_level) |
246 | size = LZ4HC_MEM_COMPRESS; |
247 | #endif |
248 | |
249 | cc->private = f2fs_kvmalloc(sbi: F2FS_I_SB(inode: cc->inode), size, GFP_NOFS); |
250 | if (!cc->private) |
251 | return -ENOMEM; |
252 | |
253 | /* |
254 | * we do not change cc->clen to LZ4_compressBound(inputsize) to |
255 | * adapt worst compress case, because lz4 compressor can handle |
256 | * output budget properly. |
257 | */ |
258 | cc->clen = cc->rlen - PAGE_SIZE - COMPRESS_HEADER_SIZE; |
259 | return 0; |
260 | } |
261 | |
262 | static void lz4_destroy_compress_ctx(struct compress_ctx *cc) |
263 | { |
264 | kvfree(addr: cc->private); |
265 | cc->private = NULL; |
266 | } |
267 | |
268 | static int lz4_compress_pages(struct compress_ctx *cc) |
269 | { |
270 | int len = -EINVAL; |
271 | unsigned char level = F2FS_I(inode: cc->inode)->i_compress_level; |
272 | |
273 | if (!level) |
274 | len = LZ4_compress_default(source: cc->rbuf, dest: cc->cbuf->cdata, inputSize: cc->rlen, |
275 | maxOutputSize: cc->clen, wrkmem: cc->private); |
276 | #ifdef CONFIG_F2FS_FS_LZ4HC |
277 | else |
278 | len = LZ4_compress_HC(src: cc->rbuf, dst: cc->cbuf->cdata, srcSize: cc->rlen, |
279 | dstCapacity: cc->clen, compressionLevel: level, wrkmem: cc->private); |
280 | #endif |
281 | if (len < 0) |
282 | return len; |
283 | if (!len) |
284 | return -EAGAIN; |
285 | |
286 | cc->clen = len; |
287 | return 0; |
288 | } |
289 | |
290 | static int lz4_decompress_pages(struct decompress_io_ctx *dic) |
291 | { |
292 | int ret; |
293 | |
294 | ret = LZ4_decompress_safe(source: dic->cbuf->cdata, dest: dic->rbuf, |
295 | compressedSize: dic->clen, maxDecompressedSize: dic->rlen); |
296 | if (ret < 0) { |
297 | printk_ratelimited("%sF2FS-fs (%s): lz4 decompress failed, ret:%d\n" , |
298 | KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id, ret); |
299 | return -EIO; |
300 | } |
301 | |
302 | if (ret != PAGE_SIZE << dic->log_cluster_size) { |
303 | printk_ratelimited("%sF2FS-fs (%s): lz4 invalid ret:%d, " |
304 | "expected:%lu\n" , KERN_ERR, |
305 | F2FS_I_SB(dic->inode)->sb->s_id, ret, |
306 | PAGE_SIZE << dic->log_cluster_size); |
307 | return -EIO; |
308 | } |
309 | return 0; |
310 | } |
311 | |
312 | static bool lz4_is_level_valid(int lvl) |
313 | { |
314 | #ifdef CONFIG_F2FS_FS_LZ4HC |
315 | return !lvl || (lvl >= LZ4HC_MIN_CLEVEL && lvl <= LZ4HC_MAX_CLEVEL); |
316 | #else |
317 | return lvl == 0; |
318 | #endif |
319 | } |
320 | |
321 | static const struct f2fs_compress_ops f2fs_lz4_ops = { |
322 | .init_compress_ctx = lz4_init_compress_ctx, |
323 | .destroy_compress_ctx = lz4_destroy_compress_ctx, |
324 | .compress_pages = lz4_compress_pages, |
325 | .decompress_pages = lz4_decompress_pages, |
326 | .is_level_valid = lz4_is_level_valid, |
327 | }; |
328 | #endif |
329 | |
330 | #ifdef CONFIG_F2FS_FS_ZSTD |
331 | static int zstd_init_compress_ctx(struct compress_ctx *cc) |
332 | { |
333 | zstd_parameters params; |
334 | zstd_cstream *stream; |
335 | void *workspace; |
336 | unsigned int workspace_size; |
337 | unsigned char level = F2FS_I(inode: cc->inode)->i_compress_level; |
338 | |
339 | /* Need to remain this for backward compatibility */ |
340 | if (!level) |
341 | level = F2FS_ZSTD_DEFAULT_CLEVEL; |
342 | |
343 | params = zstd_get_params(level, estimated_src_size: cc->rlen); |
344 | workspace_size = zstd_cstream_workspace_bound(cparams: ¶ms.cParams); |
345 | |
346 | workspace = f2fs_kvmalloc(sbi: F2FS_I_SB(inode: cc->inode), |
347 | size: workspace_size, GFP_NOFS); |
348 | if (!workspace) |
349 | return -ENOMEM; |
350 | |
351 | stream = zstd_init_cstream(parameters: ¶ms, pledged_src_size: 0, workspace, workspace_size); |
352 | if (!stream) { |
353 | printk_ratelimited("%sF2FS-fs (%s): %s zstd_init_cstream failed\n" , |
354 | KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id, |
355 | __func__); |
356 | kvfree(addr: workspace); |
357 | return -EIO; |
358 | } |
359 | |
360 | cc->private = workspace; |
361 | cc->private2 = stream; |
362 | |
363 | cc->clen = cc->rlen - PAGE_SIZE - COMPRESS_HEADER_SIZE; |
364 | return 0; |
365 | } |
366 | |
367 | static void zstd_destroy_compress_ctx(struct compress_ctx *cc) |
368 | { |
369 | kvfree(addr: cc->private); |
370 | cc->private = NULL; |
371 | cc->private2 = NULL; |
372 | } |
373 | |
374 | static int zstd_compress_pages(struct compress_ctx *cc) |
375 | { |
376 | zstd_cstream *stream = cc->private2; |
377 | zstd_in_buffer inbuf; |
378 | zstd_out_buffer outbuf; |
379 | int src_size = cc->rlen; |
380 | int dst_size = src_size - PAGE_SIZE - COMPRESS_HEADER_SIZE; |
381 | int ret; |
382 | |
383 | inbuf.pos = 0; |
384 | inbuf.src = cc->rbuf; |
385 | inbuf.size = src_size; |
386 | |
387 | outbuf.pos = 0; |
388 | outbuf.dst = cc->cbuf->cdata; |
389 | outbuf.size = dst_size; |
390 | |
391 | ret = zstd_compress_stream(cstream: stream, output: &outbuf, input: &inbuf); |
392 | if (zstd_is_error(code: ret)) { |
393 | printk_ratelimited("%sF2FS-fs (%s): %s zstd_compress_stream failed, ret: %d\n" , |
394 | KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id, |
395 | __func__, zstd_get_error_code(ret)); |
396 | return -EIO; |
397 | } |
398 | |
399 | ret = zstd_end_stream(cstream: stream, output: &outbuf); |
400 | if (zstd_is_error(code: ret)) { |
401 | printk_ratelimited("%sF2FS-fs (%s): %s zstd_end_stream returned %d\n" , |
402 | KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id, |
403 | __func__, zstd_get_error_code(ret)); |
404 | return -EIO; |
405 | } |
406 | |
407 | /* |
408 | * there is compressed data remained in intermediate buffer due to |
409 | * no more space in cbuf.cdata |
410 | */ |
411 | if (ret) |
412 | return -EAGAIN; |
413 | |
414 | cc->clen = outbuf.pos; |
415 | return 0; |
416 | } |
417 | |
418 | static int zstd_init_decompress_ctx(struct decompress_io_ctx *dic) |
419 | { |
420 | zstd_dstream *stream; |
421 | void *workspace; |
422 | unsigned int workspace_size; |
423 | unsigned int max_window_size = |
424 | MAX_COMPRESS_WINDOW_SIZE(dic->log_cluster_size); |
425 | |
426 | workspace_size = zstd_dstream_workspace_bound(max_window_size); |
427 | |
428 | workspace = f2fs_kvmalloc(sbi: F2FS_I_SB(inode: dic->inode), |
429 | size: workspace_size, GFP_NOFS); |
430 | if (!workspace) |
431 | return -ENOMEM; |
432 | |
433 | stream = zstd_init_dstream(max_window_size, workspace, workspace_size); |
434 | if (!stream) { |
435 | printk_ratelimited("%sF2FS-fs (%s): %s zstd_init_dstream failed\n" , |
436 | KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id, |
437 | __func__); |
438 | kvfree(addr: workspace); |
439 | return -EIO; |
440 | } |
441 | |
442 | dic->private = workspace; |
443 | dic->private2 = stream; |
444 | |
445 | return 0; |
446 | } |
447 | |
448 | static void zstd_destroy_decompress_ctx(struct decompress_io_ctx *dic) |
449 | { |
450 | kvfree(addr: dic->private); |
451 | dic->private = NULL; |
452 | dic->private2 = NULL; |
453 | } |
454 | |
455 | static int zstd_decompress_pages(struct decompress_io_ctx *dic) |
456 | { |
457 | zstd_dstream *stream = dic->private2; |
458 | zstd_in_buffer inbuf; |
459 | zstd_out_buffer outbuf; |
460 | int ret; |
461 | |
462 | inbuf.pos = 0; |
463 | inbuf.src = dic->cbuf->cdata; |
464 | inbuf.size = dic->clen; |
465 | |
466 | outbuf.pos = 0; |
467 | outbuf.dst = dic->rbuf; |
468 | outbuf.size = dic->rlen; |
469 | |
470 | ret = zstd_decompress_stream(dstream: stream, output: &outbuf, input: &inbuf); |
471 | if (zstd_is_error(code: ret)) { |
472 | printk_ratelimited("%sF2FS-fs (%s): %s zstd_decompress_stream failed, ret: %d\n" , |
473 | KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id, |
474 | __func__, zstd_get_error_code(ret)); |
475 | return -EIO; |
476 | } |
477 | |
478 | if (dic->rlen != outbuf.pos) { |
479 | printk_ratelimited("%sF2FS-fs (%s): %s ZSTD invalid rlen:%zu, " |
480 | "expected:%lu\n" , KERN_ERR, |
481 | F2FS_I_SB(dic->inode)->sb->s_id, |
482 | __func__, dic->rlen, |
483 | PAGE_SIZE << dic->log_cluster_size); |
484 | return -EIO; |
485 | } |
486 | |
487 | return 0; |
488 | } |
489 | |
490 | static bool zstd_is_level_valid(int lvl) |
491 | { |
492 | return lvl >= zstd_min_clevel() && lvl <= zstd_max_clevel(); |
493 | } |
494 | |
495 | static const struct f2fs_compress_ops f2fs_zstd_ops = { |
496 | .init_compress_ctx = zstd_init_compress_ctx, |
497 | .destroy_compress_ctx = zstd_destroy_compress_ctx, |
498 | .compress_pages = zstd_compress_pages, |
499 | .init_decompress_ctx = zstd_init_decompress_ctx, |
500 | .destroy_decompress_ctx = zstd_destroy_decompress_ctx, |
501 | .decompress_pages = zstd_decompress_pages, |
502 | .is_level_valid = zstd_is_level_valid, |
503 | }; |
504 | #endif |
505 | |
506 | #ifdef CONFIG_F2FS_FS_LZO |
507 | #ifdef CONFIG_F2FS_FS_LZORLE |
508 | static int lzorle_compress_pages(struct compress_ctx *cc) |
509 | { |
510 | int ret; |
511 | |
512 | ret = lzorle1x_1_compress(src: cc->rbuf, src_len: cc->rlen, dst: cc->cbuf->cdata, |
513 | dst_len: &cc->clen, wrkmem: cc->private); |
514 | if (ret != LZO_E_OK) { |
515 | f2fs_err_ratelimited(F2FS_I_SB(cc->inode), |
516 | "lzo-rle compress failed, ret:%d" , ret); |
517 | return -EIO; |
518 | } |
519 | return 0; |
520 | } |
521 | |
522 | static const struct f2fs_compress_ops f2fs_lzorle_ops = { |
523 | .init_compress_ctx = lzo_init_compress_ctx, |
524 | .destroy_compress_ctx = lzo_destroy_compress_ctx, |
525 | .compress_pages = lzorle_compress_pages, |
526 | .decompress_pages = lzo_decompress_pages, |
527 | }; |
528 | #endif |
529 | #endif |
530 | |
531 | static const struct f2fs_compress_ops *f2fs_cops[COMPRESS_MAX] = { |
532 | #ifdef CONFIG_F2FS_FS_LZO |
533 | &f2fs_lzo_ops, |
534 | #else |
535 | NULL, |
536 | #endif |
537 | #ifdef CONFIG_F2FS_FS_LZ4 |
538 | &f2fs_lz4_ops, |
539 | #else |
540 | NULL, |
541 | #endif |
542 | #ifdef CONFIG_F2FS_FS_ZSTD |
543 | &f2fs_zstd_ops, |
544 | #else |
545 | NULL, |
546 | #endif |
547 | #if defined(CONFIG_F2FS_FS_LZO) && defined(CONFIG_F2FS_FS_LZORLE) |
548 | &f2fs_lzorle_ops, |
549 | #else |
550 | NULL, |
551 | #endif |
552 | }; |
553 | |
554 | bool f2fs_is_compress_backend_ready(struct inode *inode) |
555 | { |
556 | if (!f2fs_compressed_file(inode)) |
557 | return true; |
558 | return f2fs_cops[F2FS_I(inode)->i_compress_algorithm]; |
559 | } |
560 | |
561 | bool f2fs_is_compress_level_valid(int alg, int lvl) |
562 | { |
563 | const struct f2fs_compress_ops *cops = f2fs_cops[alg]; |
564 | |
565 | if (cops->is_level_valid) |
566 | return cops->is_level_valid(lvl); |
567 | |
568 | return lvl == 0; |
569 | } |
570 | |
571 | static mempool_t *compress_page_pool; |
572 | static int num_compress_pages = 512; |
573 | module_param(num_compress_pages, uint, 0444); |
574 | MODULE_PARM_DESC(num_compress_pages, |
575 | "Number of intermediate compress pages to preallocate" ); |
576 | |
577 | int __init f2fs_init_compress_mempool(void) |
578 | { |
579 | compress_page_pool = mempool_create_page_pool(min_nr: num_compress_pages, order: 0); |
580 | return compress_page_pool ? 0 : -ENOMEM; |
581 | } |
582 | |
583 | void f2fs_destroy_compress_mempool(void) |
584 | { |
585 | mempool_destroy(pool: compress_page_pool); |
586 | } |
587 | |
588 | static struct page *f2fs_compress_alloc_page(void) |
589 | { |
590 | struct page *page; |
591 | |
592 | page = mempool_alloc(pool: compress_page_pool, GFP_NOFS); |
593 | lock_page(page); |
594 | |
595 | return page; |
596 | } |
597 | |
598 | static void f2fs_compress_free_page(struct page *page) |
599 | { |
600 | if (!page) |
601 | return; |
602 | detach_page_private(page); |
603 | page->mapping = NULL; |
604 | unlock_page(page); |
605 | mempool_free(element: page, pool: compress_page_pool); |
606 | } |
607 | |
608 | #define MAX_VMAP_RETRIES 3 |
609 | |
610 | static void *f2fs_vmap(struct page **pages, unsigned int count) |
611 | { |
612 | int i; |
613 | void *buf = NULL; |
614 | |
615 | for (i = 0; i < MAX_VMAP_RETRIES; i++) { |
616 | buf = vm_map_ram(pages, count, node: -1); |
617 | if (buf) |
618 | break; |
619 | vm_unmap_aliases(); |
620 | } |
621 | return buf; |
622 | } |
623 | |
624 | static int f2fs_compress_pages(struct compress_ctx *cc) |
625 | { |
626 | struct f2fs_inode_info *fi = F2FS_I(inode: cc->inode); |
627 | const struct f2fs_compress_ops *cops = |
628 | f2fs_cops[fi->i_compress_algorithm]; |
629 | unsigned int max_len, new_nr_cpages; |
630 | u32 chksum = 0; |
631 | int i, ret; |
632 | |
633 | trace_f2fs_compress_pages_start(inode: cc->inode, cluster_idx: cc->cluster_idx, |
634 | cluster_size: cc->cluster_size, algtype: fi->i_compress_algorithm); |
635 | |
636 | if (cops->init_compress_ctx) { |
637 | ret = cops->init_compress_ctx(cc); |
638 | if (ret) |
639 | goto out; |
640 | } |
641 | |
642 | max_len = COMPRESS_HEADER_SIZE + cc->clen; |
643 | cc->nr_cpages = DIV_ROUND_UP(max_len, PAGE_SIZE); |
644 | cc->valid_nr_cpages = cc->nr_cpages; |
645 | |
646 | cc->cpages = page_array_alloc(inode: cc->inode, nr: cc->nr_cpages); |
647 | if (!cc->cpages) { |
648 | ret = -ENOMEM; |
649 | goto destroy_compress_ctx; |
650 | } |
651 | |
652 | for (i = 0; i < cc->nr_cpages; i++) |
653 | cc->cpages[i] = f2fs_compress_alloc_page(); |
654 | |
655 | cc->rbuf = f2fs_vmap(pages: cc->rpages, count: cc->cluster_size); |
656 | if (!cc->rbuf) { |
657 | ret = -ENOMEM; |
658 | goto out_free_cpages; |
659 | } |
660 | |
661 | cc->cbuf = f2fs_vmap(pages: cc->cpages, count: cc->nr_cpages); |
662 | if (!cc->cbuf) { |
663 | ret = -ENOMEM; |
664 | goto out_vunmap_rbuf; |
665 | } |
666 | |
667 | ret = cops->compress_pages(cc); |
668 | if (ret) |
669 | goto out_vunmap_cbuf; |
670 | |
671 | max_len = PAGE_SIZE * (cc->cluster_size - 1) - COMPRESS_HEADER_SIZE; |
672 | |
673 | if (cc->clen > max_len) { |
674 | ret = -EAGAIN; |
675 | goto out_vunmap_cbuf; |
676 | } |
677 | |
678 | cc->cbuf->clen = cpu_to_le32(cc->clen); |
679 | |
680 | if (fi->i_compress_flag & BIT(COMPRESS_CHKSUM)) |
681 | chksum = f2fs_crc32(sbi: F2FS_I_SB(inode: cc->inode), |
682 | address: cc->cbuf->cdata, length: cc->clen); |
683 | cc->cbuf->chksum = cpu_to_le32(chksum); |
684 | |
685 | for (i = 0; i < COMPRESS_DATA_RESERVED_SIZE; i++) |
686 | cc->cbuf->reserved[i] = cpu_to_le32(0); |
687 | |
688 | new_nr_cpages = DIV_ROUND_UP(cc->clen + COMPRESS_HEADER_SIZE, PAGE_SIZE); |
689 | |
690 | /* zero out any unused part of the last page */ |
691 | memset(&cc->cbuf->cdata[cc->clen], 0, |
692 | (new_nr_cpages * PAGE_SIZE) - |
693 | (cc->clen + COMPRESS_HEADER_SIZE)); |
694 | |
695 | vm_unmap_ram(mem: cc->cbuf, count: cc->nr_cpages); |
696 | vm_unmap_ram(mem: cc->rbuf, count: cc->cluster_size); |
697 | |
698 | for (i = new_nr_cpages; i < cc->nr_cpages; i++) { |
699 | f2fs_compress_free_page(page: cc->cpages[i]); |
700 | cc->cpages[i] = NULL; |
701 | } |
702 | |
703 | if (cops->destroy_compress_ctx) |
704 | cops->destroy_compress_ctx(cc); |
705 | |
706 | cc->valid_nr_cpages = new_nr_cpages; |
707 | |
708 | trace_f2fs_compress_pages_end(inode: cc->inode, cluster_idx: cc->cluster_idx, |
709 | compressed_size: cc->clen, ret); |
710 | return 0; |
711 | |
712 | out_vunmap_cbuf: |
713 | vm_unmap_ram(mem: cc->cbuf, count: cc->nr_cpages); |
714 | out_vunmap_rbuf: |
715 | vm_unmap_ram(mem: cc->rbuf, count: cc->cluster_size); |
716 | out_free_cpages: |
717 | for (i = 0; i < cc->nr_cpages; i++) { |
718 | if (cc->cpages[i]) |
719 | f2fs_compress_free_page(page: cc->cpages[i]); |
720 | } |
721 | page_array_free(inode: cc->inode, pages: cc->cpages, nr: cc->nr_cpages); |
722 | cc->cpages = NULL; |
723 | destroy_compress_ctx: |
724 | if (cops->destroy_compress_ctx) |
725 | cops->destroy_compress_ctx(cc); |
726 | out: |
727 | trace_f2fs_compress_pages_end(inode: cc->inode, cluster_idx: cc->cluster_idx, |
728 | compressed_size: cc->clen, ret); |
729 | return ret; |
730 | } |
731 | |
732 | static int f2fs_prepare_decomp_mem(struct decompress_io_ctx *dic, |
733 | bool pre_alloc); |
734 | static void f2fs_release_decomp_mem(struct decompress_io_ctx *dic, |
735 | bool bypass_destroy_callback, bool pre_alloc); |
736 | |
737 | void f2fs_decompress_cluster(struct decompress_io_ctx *dic, bool in_task) |
738 | { |
739 | struct f2fs_sb_info *sbi = F2FS_I_SB(inode: dic->inode); |
740 | struct f2fs_inode_info *fi = F2FS_I(inode: dic->inode); |
741 | const struct f2fs_compress_ops *cops = |
742 | f2fs_cops[fi->i_compress_algorithm]; |
743 | bool bypass_callback = false; |
744 | int ret; |
745 | |
746 | trace_f2fs_decompress_pages_start(inode: dic->inode, cluster_idx: dic->cluster_idx, |
747 | cluster_size: dic->cluster_size, algtype: fi->i_compress_algorithm); |
748 | |
749 | if (dic->failed) { |
750 | ret = -EIO; |
751 | goto out_end_io; |
752 | } |
753 | |
754 | ret = f2fs_prepare_decomp_mem(dic, pre_alloc: false); |
755 | if (ret) { |
756 | bypass_callback = true; |
757 | goto out_release; |
758 | } |
759 | |
760 | dic->clen = le32_to_cpu(dic->cbuf->clen); |
761 | dic->rlen = PAGE_SIZE << dic->log_cluster_size; |
762 | |
763 | if (dic->clen > PAGE_SIZE * dic->nr_cpages - COMPRESS_HEADER_SIZE) { |
764 | ret = -EFSCORRUPTED; |
765 | |
766 | /* Avoid f2fs_commit_super in irq context */ |
767 | if (!in_task) |
768 | f2fs_handle_error_async(sbi, error: ERROR_FAIL_DECOMPRESSION); |
769 | else |
770 | f2fs_handle_error(sbi, error: ERROR_FAIL_DECOMPRESSION); |
771 | goto out_release; |
772 | } |
773 | |
774 | ret = cops->decompress_pages(dic); |
775 | |
776 | if (!ret && (fi->i_compress_flag & BIT(COMPRESS_CHKSUM))) { |
777 | u32 provided = le32_to_cpu(dic->cbuf->chksum); |
778 | u32 calculated = f2fs_crc32(sbi, address: dic->cbuf->cdata, length: dic->clen); |
779 | |
780 | if (provided != calculated) { |
781 | if (!is_inode_flag_set(inode: dic->inode, flag: FI_COMPRESS_CORRUPT)) { |
782 | set_inode_flag(inode: dic->inode, flag: FI_COMPRESS_CORRUPT); |
783 | f2fs_info_ratelimited(sbi, |
784 | "checksum invalid, nid = %lu, %x vs %x" , |
785 | dic->inode->i_ino, |
786 | provided, calculated); |
787 | } |
788 | set_sbi_flag(sbi, type: SBI_NEED_FSCK); |
789 | } |
790 | } |
791 | |
792 | out_release: |
793 | f2fs_release_decomp_mem(dic, bypass_destroy_callback: bypass_callback, pre_alloc: false); |
794 | |
795 | out_end_io: |
796 | trace_f2fs_decompress_pages_end(inode: dic->inode, cluster_idx: dic->cluster_idx, |
797 | compressed_size: dic->clen, ret); |
798 | f2fs_decompress_end_io(dic, failed: ret, in_task); |
799 | } |
800 | |
801 | /* |
802 | * This is called when a page of a compressed cluster has been read from disk |
803 | * (or failed to be read from disk). It checks whether this page was the last |
804 | * page being waited on in the cluster, and if so, it decompresses the cluster |
805 | * (or in the case of a failure, cleans up without actually decompressing). |
806 | */ |
807 | void f2fs_end_read_compressed_page(struct page *page, bool failed, |
808 | block_t blkaddr, bool in_task) |
809 | { |
810 | struct decompress_io_ctx *dic = |
811 | (struct decompress_io_ctx *)page_private(page); |
812 | struct f2fs_sb_info *sbi = F2FS_I_SB(inode: dic->inode); |
813 | |
814 | dec_page_count(sbi, count_type: F2FS_RD_DATA); |
815 | |
816 | if (failed) |
817 | WRITE_ONCE(dic->failed, true); |
818 | else if (blkaddr && in_task) |
819 | f2fs_cache_compressed_page(sbi, page, |
820 | ino: dic->inode->i_ino, blkaddr); |
821 | |
822 | if (atomic_dec_and_test(v: &dic->remaining_pages)) |
823 | f2fs_decompress_cluster(dic, in_task); |
824 | } |
825 | |
826 | static bool is_page_in_cluster(struct compress_ctx *cc, pgoff_t index) |
827 | { |
828 | if (cc->cluster_idx == NULL_CLUSTER) |
829 | return true; |
830 | return cc->cluster_idx == cluster_idx(cc, index); |
831 | } |
832 | |
833 | bool f2fs_cluster_is_empty(struct compress_ctx *cc) |
834 | { |
835 | return cc->nr_rpages == 0; |
836 | } |
837 | |
838 | static bool f2fs_cluster_is_full(struct compress_ctx *cc) |
839 | { |
840 | return cc->cluster_size == cc->nr_rpages; |
841 | } |
842 | |
843 | bool f2fs_cluster_can_merge_page(struct compress_ctx *cc, pgoff_t index) |
844 | { |
845 | if (f2fs_cluster_is_empty(cc)) |
846 | return true; |
847 | return is_page_in_cluster(cc, index); |
848 | } |
849 | |
850 | bool f2fs_all_cluster_page_ready(struct compress_ctx *cc, struct page **pages, |
851 | int index, int nr_pages, bool uptodate) |
852 | { |
853 | unsigned long pgidx = pages[index]->index; |
854 | int i = uptodate ? 0 : 1; |
855 | |
856 | /* |
857 | * when uptodate set to true, try to check all pages in cluster is |
858 | * uptodate or not. |
859 | */ |
860 | if (uptodate && (pgidx % cc->cluster_size)) |
861 | return false; |
862 | |
863 | if (nr_pages - index < cc->cluster_size) |
864 | return false; |
865 | |
866 | for (; i < cc->cluster_size; i++) { |
867 | if (pages[index + i]->index != pgidx + i) |
868 | return false; |
869 | if (uptodate && !PageUptodate(page: pages[index + i])) |
870 | return false; |
871 | } |
872 | |
873 | return true; |
874 | } |
875 | |
876 | static bool cluster_has_invalid_data(struct compress_ctx *cc) |
877 | { |
878 | loff_t i_size = i_size_read(inode: cc->inode); |
879 | unsigned nr_pages = DIV_ROUND_UP(i_size, PAGE_SIZE); |
880 | int i; |
881 | |
882 | for (i = 0; i < cc->cluster_size; i++) { |
883 | struct page *page = cc->rpages[i]; |
884 | |
885 | f2fs_bug_on(F2FS_I_SB(cc->inode), !page); |
886 | |
887 | /* beyond EOF */ |
888 | if (page->index >= nr_pages) |
889 | return true; |
890 | } |
891 | return false; |
892 | } |
893 | |
894 | bool f2fs_sanity_check_cluster(struct dnode_of_data *dn) |
895 | { |
896 | #ifdef CONFIG_F2FS_CHECK_FS |
897 | struct f2fs_sb_info *sbi = F2FS_I_SB(inode: dn->inode); |
898 | unsigned int cluster_size = F2FS_I(inode: dn->inode)->i_cluster_size; |
899 | int cluster_end = 0; |
900 | unsigned int count; |
901 | int i; |
902 | char *reason = "" ; |
903 | |
904 | if (dn->data_blkaddr != COMPRESS_ADDR) |
905 | return false; |
906 | |
907 | /* [..., COMPR_ADDR, ...] */ |
908 | if (dn->ofs_in_node % cluster_size) { |
909 | reason = "[*|C|*|*]" ; |
910 | goto out; |
911 | } |
912 | |
913 | for (i = 1, count = 1; i < cluster_size; i++, count++) { |
914 | block_t blkaddr = data_blkaddr(inode: dn->inode, node_page: dn->node_page, |
915 | offset: dn->ofs_in_node + i); |
916 | |
917 | /* [COMPR_ADDR, ..., COMPR_ADDR] */ |
918 | if (blkaddr == COMPRESS_ADDR) { |
919 | reason = "[C|*|C|*]" ; |
920 | goto out; |
921 | } |
922 | if (!__is_valid_data_blkaddr(blkaddr)) { |
923 | if (!cluster_end) |
924 | cluster_end = i; |
925 | continue; |
926 | } |
927 | /* [COMPR_ADDR, NULL_ADDR or NEW_ADDR, valid_blkaddr] */ |
928 | if (cluster_end) { |
929 | reason = "[C|N|N|V]" ; |
930 | goto out; |
931 | } |
932 | } |
933 | |
934 | f2fs_bug_on(F2FS_I_SB(dn->inode), count != cluster_size && |
935 | !is_inode_flag_set(dn->inode, FI_COMPRESS_RELEASED)); |
936 | |
937 | return false; |
938 | out: |
939 | f2fs_warn(sbi, "access invalid cluster, ino:%lu, nid:%u, ofs_in_node:%u, reason:%s" , |
940 | dn->inode->i_ino, dn->nid, dn->ofs_in_node, reason); |
941 | set_sbi_flag(sbi, type: SBI_NEED_FSCK); |
942 | return true; |
943 | #else |
944 | return false; |
945 | #endif |
946 | } |
947 | |
948 | static int __f2fs_get_cluster_blocks(struct inode *inode, |
949 | struct dnode_of_data *dn) |
950 | { |
951 | unsigned int cluster_size = F2FS_I(inode)->i_cluster_size; |
952 | int count, i; |
953 | |
954 | for (i = 1, count = 1; i < cluster_size; i++) { |
955 | block_t blkaddr = data_blkaddr(inode: dn->inode, node_page: dn->node_page, |
956 | offset: dn->ofs_in_node + i); |
957 | |
958 | if (__is_valid_data_blkaddr(blkaddr)) |
959 | count++; |
960 | } |
961 | |
962 | return count; |
963 | } |
964 | |
965 | static int __f2fs_cluster_blocks(struct inode *inode, |
966 | unsigned int cluster_idx, bool compr_blks) |
967 | { |
968 | struct dnode_of_data dn; |
969 | unsigned int start_idx = cluster_idx << |
970 | F2FS_I(inode)->i_log_cluster_size; |
971 | int ret; |
972 | |
973 | set_new_dnode(dn: &dn, inode, NULL, NULL, nid: 0); |
974 | ret = f2fs_get_dnode_of_data(dn: &dn, index: start_idx, mode: LOOKUP_NODE); |
975 | if (ret) { |
976 | if (ret == -ENOENT) |
977 | ret = 0; |
978 | goto fail; |
979 | } |
980 | |
981 | if (f2fs_sanity_check_cluster(dn: &dn)) { |
982 | ret = -EFSCORRUPTED; |
983 | goto fail; |
984 | } |
985 | |
986 | if (dn.data_blkaddr == COMPRESS_ADDR) { |
987 | if (compr_blks) |
988 | ret = __f2fs_get_cluster_blocks(inode, dn: &dn); |
989 | else |
990 | ret = 1; |
991 | } |
992 | fail: |
993 | f2fs_put_dnode(dn: &dn); |
994 | return ret; |
995 | } |
996 | |
997 | /* return # of compressed blocks in compressed cluster */ |
998 | static int f2fs_compressed_blocks(struct compress_ctx *cc) |
999 | { |
1000 | return __f2fs_cluster_blocks(inode: cc->inode, cluster_idx: cc->cluster_idx, compr_blks: true); |
1001 | } |
1002 | |
1003 | /* return whether cluster is compressed one or not */ |
1004 | int f2fs_is_compressed_cluster(struct inode *inode, pgoff_t index) |
1005 | { |
1006 | return __f2fs_cluster_blocks(inode, |
1007 | cluster_idx: index >> F2FS_I(inode)->i_log_cluster_size, |
1008 | compr_blks: false); |
1009 | } |
1010 | |
1011 | static bool cluster_may_compress(struct compress_ctx *cc) |
1012 | { |
1013 | if (!f2fs_need_compress_data(inode: cc->inode)) |
1014 | return false; |
1015 | if (f2fs_is_atomic_file(inode: cc->inode)) |
1016 | return false; |
1017 | if (!f2fs_cluster_is_full(cc)) |
1018 | return false; |
1019 | if (unlikely(f2fs_cp_error(F2FS_I_SB(cc->inode)))) |
1020 | return false; |
1021 | return !cluster_has_invalid_data(cc); |
1022 | } |
1023 | |
1024 | static void set_cluster_writeback(struct compress_ctx *cc) |
1025 | { |
1026 | int i; |
1027 | |
1028 | for (i = 0; i < cc->cluster_size; i++) { |
1029 | if (cc->rpages[i]) |
1030 | set_page_writeback(cc->rpages[i]); |
1031 | } |
1032 | } |
1033 | |
1034 | static void set_cluster_dirty(struct compress_ctx *cc) |
1035 | { |
1036 | int i; |
1037 | |
1038 | for (i = 0; i < cc->cluster_size; i++) |
1039 | if (cc->rpages[i]) { |
1040 | set_page_dirty(cc->rpages[i]); |
1041 | set_page_private_gcing(cc->rpages[i]); |
1042 | } |
1043 | } |
1044 | |
1045 | static int prepare_compress_overwrite(struct compress_ctx *cc, |
1046 | struct page **pagep, pgoff_t index, void **fsdata) |
1047 | { |
1048 | struct f2fs_sb_info *sbi = F2FS_I_SB(inode: cc->inode); |
1049 | struct address_space *mapping = cc->inode->i_mapping; |
1050 | struct page *page; |
1051 | sector_t last_block_in_bio; |
1052 | fgf_t fgp_flag = FGP_LOCK | FGP_WRITE | FGP_CREAT; |
1053 | pgoff_t start_idx = start_idx_of_cluster(cc); |
1054 | int i, ret; |
1055 | |
1056 | retry: |
1057 | ret = f2fs_is_compressed_cluster(inode: cc->inode, index: start_idx); |
1058 | if (ret <= 0) |
1059 | return ret; |
1060 | |
1061 | ret = f2fs_init_compress_ctx(cc); |
1062 | if (ret) |
1063 | return ret; |
1064 | |
1065 | /* keep page reference to avoid page reclaim */ |
1066 | for (i = 0; i < cc->cluster_size; i++) { |
1067 | page = f2fs_pagecache_get_page(mapping, index: start_idx + i, |
1068 | fgp_flags: fgp_flag, GFP_NOFS); |
1069 | if (!page) { |
1070 | ret = -ENOMEM; |
1071 | goto unlock_pages; |
1072 | } |
1073 | |
1074 | if (PageUptodate(page)) |
1075 | f2fs_put_page(page, unlock: 1); |
1076 | else |
1077 | f2fs_compress_ctx_add_page(cc, page); |
1078 | } |
1079 | |
1080 | if (!f2fs_cluster_is_empty(cc)) { |
1081 | struct bio *bio = NULL; |
1082 | |
1083 | ret = f2fs_read_multi_pages(cc, bio_ret: &bio, nr_pages: cc->cluster_size, |
1084 | last_block_in_bio: &last_block_in_bio, is_readahead: false, for_write: true); |
1085 | f2fs_put_rpages(cc); |
1086 | f2fs_destroy_compress_ctx(cc, reuse: true); |
1087 | if (ret) |
1088 | goto out; |
1089 | if (bio) |
1090 | f2fs_submit_read_bio(sbi, bio, type: DATA); |
1091 | |
1092 | ret = f2fs_init_compress_ctx(cc); |
1093 | if (ret) |
1094 | goto out; |
1095 | } |
1096 | |
1097 | for (i = 0; i < cc->cluster_size; i++) { |
1098 | f2fs_bug_on(sbi, cc->rpages[i]); |
1099 | |
1100 | page = find_lock_page(mapping, index: start_idx + i); |
1101 | if (!page) { |
1102 | /* page can be truncated */ |
1103 | goto release_and_retry; |
1104 | } |
1105 | |
1106 | f2fs_wait_on_page_writeback(page, type: DATA, ordered: true, locked: true); |
1107 | f2fs_compress_ctx_add_page(cc, page); |
1108 | |
1109 | if (!PageUptodate(page)) { |
1110 | release_and_retry: |
1111 | f2fs_put_rpages(cc); |
1112 | f2fs_unlock_rpages(cc, len: i + 1); |
1113 | f2fs_destroy_compress_ctx(cc, reuse: true); |
1114 | goto retry; |
1115 | } |
1116 | } |
1117 | |
1118 | if (likely(!ret)) { |
1119 | *fsdata = cc->rpages; |
1120 | *pagep = cc->rpages[offset_in_cluster(cc, index)]; |
1121 | return cc->cluster_size; |
1122 | } |
1123 | |
1124 | unlock_pages: |
1125 | f2fs_put_rpages(cc); |
1126 | f2fs_unlock_rpages(cc, len: i); |
1127 | f2fs_destroy_compress_ctx(cc, reuse: true); |
1128 | out: |
1129 | return ret; |
1130 | } |
1131 | |
1132 | int f2fs_prepare_compress_overwrite(struct inode *inode, |
1133 | struct page **pagep, pgoff_t index, void **fsdata) |
1134 | { |
1135 | struct compress_ctx cc = { |
1136 | .inode = inode, |
1137 | .log_cluster_size = F2FS_I(inode)->i_log_cluster_size, |
1138 | .cluster_size = F2FS_I(inode)->i_cluster_size, |
1139 | .cluster_idx = index >> F2FS_I(inode)->i_log_cluster_size, |
1140 | .rpages = NULL, |
1141 | .nr_rpages = 0, |
1142 | }; |
1143 | |
1144 | return prepare_compress_overwrite(cc: &cc, pagep, index, fsdata); |
1145 | } |
1146 | |
1147 | bool f2fs_compress_write_end(struct inode *inode, void *fsdata, |
1148 | pgoff_t index, unsigned copied) |
1149 | |
1150 | { |
1151 | struct compress_ctx cc = { |
1152 | .inode = inode, |
1153 | .log_cluster_size = F2FS_I(inode)->i_log_cluster_size, |
1154 | .cluster_size = F2FS_I(inode)->i_cluster_size, |
1155 | .rpages = fsdata, |
1156 | }; |
1157 | bool first_index = (index == cc.rpages[0]->index); |
1158 | |
1159 | if (copied) |
1160 | set_cluster_dirty(&cc); |
1161 | |
1162 | f2fs_put_rpages_wbc(cc: &cc, NULL, redirty: false, unlock: 1); |
1163 | f2fs_destroy_compress_ctx(cc: &cc, reuse: false); |
1164 | |
1165 | return first_index; |
1166 | } |
1167 | |
1168 | int f2fs_truncate_partial_cluster(struct inode *inode, u64 from, bool lock) |
1169 | { |
1170 | void *fsdata = NULL; |
1171 | struct page *pagep; |
1172 | int log_cluster_size = F2FS_I(inode)->i_log_cluster_size; |
1173 | pgoff_t start_idx = from >> (PAGE_SHIFT + log_cluster_size) << |
1174 | log_cluster_size; |
1175 | int err; |
1176 | |
1177 | err = f2fs_is_compressed_cluster(inode, index: start_idx); |
1178 | if (err < 0) |
1179 | return err; |
1180 | |
1181 | /* truncate normal cluster */ |
1182 | if (!err) |
1183 | return f2fs_do_truncate_blocks(inode, from, lock); |
1184 | |
1185 | /* truncate compressed cluster */ |
1186 | err = f2fs_prepare_compress_overwrite(inode, pagep: &pagep, |
1187 | index: start_idx, fsdata: &fsdata); |
1188 | |
1189 | /* should not be a normal cluster */ |
1190 | f2fs_bug_on(F2FS_I_SB(inode), err == 0); |
1191 | |
1192 | if (err <= 0) |
1193 | return err; |
1194 | |
1195 | if (err > 0) { |
1196 | struct page **rpages = fsdata; |
1197 | int cluster_size = F2FS_I(inode)->i_cluster_size; |
1198 | int i; |
1199 | |
1200 | for (i = cluster_size - 1; i >= 0; i--) { |
1201 | loff_t start = rpages[i]->index << PAGE_SHIFT; |
1202 | |
1203 | if (from <= start) { |
1204 | zero_user_segment(page: rpages[i], start: 0, PAGE_SIZE); |
1205 | } else { |
1206 | zero_user_segment(page: rpages[i], start: from - start, |
1207 | PAGE_SIZE); |
1208 | break; |
1209 | } |
1210 | } |
1211 | |
1212 | f2fs_compress_write_end(inode, fsdata, index: start_idx, copied: true); |
1213 | } |
1214 | return 0; |
1215 | } |
1216 | |
1217 | static int f2fs_write_compressed_pages(struct compress_ctx *cc, |
1218 | int *submitted, |
1219 | struct writeback_control *wbc, |
1220 | enum iostat_type io_type) |
1221 | { |
1222 | struct inode *inode = cc->inode; |
1223 | struct f2fs_sb_info *sbi = F2FS_I_SB(inode); |
1224 | struct f2fs_inode_info *fi = F2FS_I(inode); |
1225 | struct f2fs_io_info fio = { |
1226 | .sbi = sbi, |
1227 | .ino = cc->inode->i_ino, |
1228 | .type = DATA, |
1229 | .op = REQ_OP_WRITE, |
1230 | .op_flags = wbc_to_write_flags(wbc), |
1231 | .old_blkaddr = NEW_ADDR, |
1232 | .page = NULL, |
1233 | .encrypted_page = NULL, |
1234 | .compressed_page = NULL, |
1235 | .submitted = 0, |
1236 | .io_type = io_type, |
1237 | .io_wbc = wbc, |
1238 | .encrypted = fscrypt_inode_uses_fs_layer_crypto(inode: cc->inode) ? |
1239 | 1 : 0, |
1240 | }; |
1241 | struct dnode_of_data dn; |
1242 | struct node_info ni; |
1243 | struct compress_io_ctx *cic; |
1244 | pgoff_t start_idx = start_idx_of_cluster(cc); |
1245 | unsigned int last_index = cc->cluster_size - 1; |
1246 | loff_t psize; |
1247 | int i, err; |
1248 | bool quota_inode = IS_NOQUOTA(inode); |
1249 | |
1250 | /* we should bypass data pages to proceed the kworker jobs */ |
1251 | if (unlikely(f2fs_cp_error(sbi))) { |
1252 | mapping_set_error(mapping: cc->rpages[0]->mapping, error: -EIO); |
1253 | goto out_free; |
1254 | } |
1255 | |
1256 | if (quota_inode) { |
1257 | /* |
1258 | * We need to wait for node_write to avoid block allocation during |
1259 | * checkpoint. This can only happen to quota writes which can cause |
1260 | * the below discard race condition. |
1261 | */ |
1262 | f2fs_down_read(sem: &sbi->node_write); |
1263 | } else if (!f2fs_trylock_op(sbi)) { |
1264 | goto out_free; |
1265 | } |
1266 | |
1267 | set_new_dnode(dn: &dn, inode: cc->inode, NULL, NULL, nid: 0); |
1268 | |
1269 | err = f2fs_get_dnode_of_data(dn: &dn, index: start_idx, mode: LOOKUP_NODE); |
1270 | if (err) |
1271 | goto out_unlock_op; |
1272 | |
1273 | for (i = 0; i < cc->cluster_size; i++) { |
1274 | if (data_blkaddr(inode: dn.inode, node_page: dn.node_page, |
1275 | offset: dn.ofs_in_node + i) == NULL_ADDR) |
1276 | goto out_put_dnode; |
1277 | } |
1278 | |
1279 | psize = (loff_t)(cc->rpages[last_index]->index + 1) << PAGE_SHIFT; |
1280 | |
1281 | err = f2fs_get_node_info(sbi: fio.sbi, nid: dn.nid, ni: &ni, checkpoint_context: false); |
1282 | if (err) |
1283 | goto out_put_dnode; |
1284 | |
1285 | fio.version = ni.version; |
1286 | |
1287 | cic = f2fs_kmem_cache_alloc(cachep: cic_entry_slab, GFP_F2FS_ZERO, nofail: false, sbi); |
1288 | if (!cic) |
1289 | goto out_put_dnode; |
1290 | |
1291 | cic->magic = F2FS_COMPRESSED_PAGE_MAGIC; |
1292 | cic->inode = inode; |
1293 | atomic_set(v: &cic->pending_pages, i: cc->valid_nr_cpages); |
1294 | cic->rpages = page_array_alloc(inode: cc->inode, nr: cc->cluster_size); |
1295 | if (!cic->rpages) |
1296 | goto out_put_cic; |
1297 | |
1298 | cic->nr_rpages = cc->cluster_size; |
1299 | |
1300 | for (i = 0; i < cc->valid_nr_cpages; i++) { |
1301 | f2fs_set_compressed_page(page: cc->cpages[i], inode, |
1302 | index: cc->rpages[i + 1]->index, data: cic); |
1303 | fio.compressed_page = cc->cpages[i]; |
1304 | |
1305 | fio.old_blkaddr = data_blkaddr(inode: dn.inode, node_page: dn.node_page, |
1306 | offset: dn.ofs_in_node + i + 1); |
1307 | |
1308 | /* wait for GCed page writeback via META_MAPPING */ |
1309 | f2fs_wait_on_block_writeback(inode, blkaddr: fio.old_blkaddr); |
1310 | |
1311 | if (fio.encrypted) { |
1312 | fio.page = cc->rpages[i + 1]; |
1313 | err = f2fs_encrypt_one_page(fio: &fio); |
1314 | if (err) |
1315 | goto out_destroy_crypt; |
1316 | cc->cpages[i] = fio.encrypted_page; |
1317 | } |
1318 | } |
1319 | |
1320 | set_cluster_writeback(cc); |
1321 | |
1322 | for (i = 0; i < cc->cluster_size; i++) |
1323 | cic->rpages[i] = cc->rpages[i]; |
1324 | |
1325 | for (i = 0; i < cc->cluster_size; i++, dn.ofs_in_node++) { |
1326 | block_t blkaddr; |
1327 | |
1328 | blkaddr = f2fs_data_blkaddr(dn: &dn); |
1329 | fio.page = cc->rpages[i]; |
1330 | fio.old_blkaddr = blkaddr; |
1331 | |
1332 | /* cluster header */ |
1333 | if (i == 0) { |
1334 | if (blkaddr == COMPRESS_ADDR) |
1335 | fio.compr_blocks++; |
1336 | if (__is_valid_data_blkaddr(blkaddr)) |
1337 | f2fs_invalidate_blocks(sbi, addr: blkaddr); |
1338 | f2fs_update_data_blkaddr(dn: &dn, COMPRESS_ADDR); |
1339 | goto unlock_continue; |
1340 | } |
1341 | |
1342 | if (fio.compr_blocks && __is_valid_data_blkaddr(blkaddr)) |
1343 | fio.compr_blocks++; |
1344 | |
1345 | if (i > cc->valid_nr_cpages) { |
1346 | if (__is_valid_data_blkaddr(blkaddr)) { |
1347 | f2fs_invalidate_blocks(sbi, addr: blkaddr); |
1348 | f2fs_update_data_blkaddr(dn: &dn, NEW_ADDR); |
1349 | } |
1350 | goto unlock_continue; |
1351 | } |
1352 | |
1353 | f2fs_bug_on(fio.sbi, blkaddr == NULL_ADDR); |
1354 | |
1355 | if (fio.encrypted) |
1356 | fio.encrypted_page = cc->cpages[i - 1]; |
1357 | else |
1358 | fio.compressed_page = cc->cpages[i - 1]; |
1359 | |
1360 | cc->cpages[i - 1] = NULL; |
1361 | f2fs_outplace_write_data(dn: &dn, fio: &fio); |
1362 | (*submitted)++; |
1363 | unlock_continue: |
1364 | inode_dec_dirty_pages(inode: cc->inode); |
1365 | unlock_page(page: fio.page); |
1366 | } |
1367 | |
1368 | if (fio.compr_blocks) |
1369 | f2fs_i_compr_blocks_update(inode, blocks: fio.compr_blocks - 1, add: false); |
1370 | f2fs_i_compr_blocks_update(inode, blocks: cc->valid_nr_cpages, add: true); |
1371 | add_compr_block_stat(inode, cc->valid_nr_cpages); |
1372 | |
1373 | set_inode_flag(inode: cc->inode, flag: FI_APPEND_WRITE); |
1374 | |
1375 | f2fs_put_dnode(dn: &dn); |
1376 | if (quota_inode) |
1377 | f2fs_up_read(sem: &sbi->node_write); |
1378 | else |
1379 | f2fs_unlock_op(sbi); |
1380 | |
1381 | spin_lock(lock: &fi->i_size_lock); |
1382 | if (fi->last_disk_size < psize) |
1383 | fi->last_disk_size = psize; |
1384 | spin_unlock(lock: &fi->i_size_lock); |
1385 | |
1386 | f2fs_put_rpages(cc); |
1387 | page_array_free(inode: cc->inode, pages: cc->cpages, nr: cc->nr_cpages); |
1388 | cc->cpages = NULL; |
1389 | f2fs_destroy_compress_ctx(cc, reuse: false); |
1390 | return 0; |
1391 | |
1392 | out_destroy_crypt: |
1393 | page_array_free(inode: cc->inode, pages: cic->rpages, nr: cc->cluster_size); |
1394 | |
1395 | for (--i; i >= 0; i--) |
1396 | fscrypt_finalize_bounce_page(pagep: &cc->cpages[i]); |
1397 | out_put_cic: |
1398 | kmem_cache_free(s: cic_entry_slab, objp: cic); |
1399 | out_put_dnode: |
1400 | f2fs_put_dnode(dn: &dn); |
1401 | out_unlock_op: |
1402 | if (quota_inode) |
1403 | f2fs_up_read(sem: &sbi->node_write); |
1404 | else |
1405 | f2fs_unlock_op(sbi); |
1406 | out_free: |
1407 | for (i = 0; i < cc->valid_nr_cpages; i++) { |
1408 | f2fs_compress_free_page(page: cc->cpages[i]); |
1409 | cc->cpages[i] = NULL; |
1410 | } |
1411 | page_array_free(inode: cc->inode, pages: cc->cpages, nr: cc->nr_cpages); |
1412 | cc->cpages = NULL; |
1413 | return -EAGAIN; |
1414 | } |
1415 | |
1416 | void f2fs_compress_write_end_io(struct bio *bio, struct page *page) |
1417 | { |
1418 | struct f2fs_sb_info *sbi = bio->bi_private; |
1419 | struct compress_io_ctx *cic = |
1420 | (struct compress_io_ctx *)page_private(page); |
1421 | enum count_type type = WB_DATA_TYPE(page, |
1422 | f2fs_is_compressed_page(page)); |
1423 | int i; |
1424 | |
1425 | if (unlikely(bio->bi_status)) |
1426 | mapping_set_error(mapping: cic->inode->i_mapping, error: -EIO); |
1427 | |
1428 | f2fs_compress_free_page(page); |
1429 | |
1430 | dec_page_count(sbi, count_type: type); |
1431 | |
1432 | if (atomic_dec_return(v: &cic->pending_pages)) |
1433 | return; |
1434 | |
1435 | for (i = 0; i < cic->nr_rpages; i++) { |
1436 | WARN_ON(!cic->rpages[i]); |
1437 | clear_page_private_gcing(page: cic->rpages[i]); |
1438 | end_page_writeback(page: cic->rpages[i]); |
1439 | } |
1440 | |
1441 | page_array_free(inode: cic->inode, pages: cic->rpages, nr: cic->nr_rpages); |
1442 | kmem_cache_free(s: cic_entry_slab, objp: cic); |
1443 | } |
1444 | |
1445 | static int f2fs_write_raw_pages(struct compress_ctx *cc, |
1446 | int *submitted_p, |
1447 | struct writeback_control *wbc, |
1448 | enum iostat_type io_type) |
1449 | { |
1450 | struct address_space *mapping = cc->inode->i_mapping; |
1451 | struct f2fs_sb_info *sbi = F2FS_M_SB(mapping); |
1452 | int submitted, compr_blocks, i; |
1453 | int ret = 0; |
1454 | |
1455 | compr_blocks = f2fs_compressed_blocks(cc); |
1456 | |
1457 | for (i = 0; i < cc->cluster_size; i++) { |
1458 | if (!cc->rpages[i]) |
1459 | continue; |
1460 | |
1461 | redirty_page_for_writepage(wbc, cc->rpages[i]); |
1462 | unlock_page(page: cc->rpages[i]); |
1463 | } |
1464 | |
1465 | if (compr_blocks < 0) |
1466 | return compr_blocks; |
1467 | |
1468 | /* overwrite compressed cluster w/ normal cluster */ |
1469 | if (compr_blocks > 0) |
1470 | f2fs_lock_op(sbi); |
1471 | |
1472 | for (i = 0; i < cc->cluster_size; i++) { |
1473 | if (!cc->rpages[i]) |
1474 | continue; |
1475 | retry_write: |
1476 | lock_page(page: cc->rpages[i]); |
1477 | |
1478 | if (cc->rpages[i]->mapping != mapping) { |
1479 | continue_unlock: |
1480 | unlock_page(page: cc->rpages[i]); |
1481 | continue; |
1482 | } |
1483 | |
1484 | if (!PageDirty(page: cc->rpages[i])) |
1485 | goto continue_unlock; |
1486 | |
1487 | if (PageWriteback(page: cc->rpages[i])) { |
1488 | if (wbc->sync_mode == WB_SYNC_NONE) |
1489 | goto continue_unlock; |
1490 | f2fs_wait_on_page_writeback(page: cc->rpages[i], type: DATA, ordered: true, locked: true); |
1491 | } |
1492 | |
1493 | if (!clear_page_dirty_for_io(page: cc->rpages[i])) |
1494 | goto continue_unlock; |
1495 | |
1496 | ret = f2fs_write_single_data_page(page: cc->rpages[i], submitted: &submitted, |
1497 | NULL, NULL, wbc, io_type, |
1498 | compr_blocks, allow_balance: false); |
1499 | if (ret) { |
1500 | if (ret == AOP_WRITEPAGE_ACTIVATE) { |
1501 | unlock_page(page: cc->rpages[i]); |
1502 | ret = 0; |
1503 | } else if (ret == -EAGAIN) { |
1504 | ret = 0; |
1505 | /* |
1506 | * for quota file, just redirty left pages to |
1507 | * avoid deadlock caused by cluster update race |
1508 | * from foreground operation. |
1509 | */ |
1510 | if (IS_NOQUOTA(cc->inode)) |
1511 | goto out; |
1512 | f2fs_io_schedule_timeout(DEFAULT_IO_TIMEOUT); |
1513 | goto retry_write; |
1514 | } |
1515 | goto out; |
1516 | } |
1517 | |
1518 | *submitted_p += submitted; |
1519 | } |
1520 | |
1521 | out: |
1522 | if (compr_blocks > 0) |
1523 | f2fs_unlock_op(sbi); |
1524 | |
1525 | f2fs_balance_fs(sbi, need: true); |
1526 | return ret; |
1527 | } |
1528 | |
1529 | int f2fs_write_multi_pages(struct compress_ctx *cc, |
1530 | int *submitted, |
1531 | struct writeback_control *wbc, |
1532 | enum iostat_type io_type) |
1533 | { |
1534 | int err; |
1535 | |
1536 | *submitted = 0; |
1537 | if (cluster_may_compress(cc)) { |
1538 | err = f2fs_compress_pages(cc); |
1539 | if (err == -EAGAIN) { |
1540 | add_compr_block_stat(cc->inode, cc->cluster_size); |
1541 | goto write; |
1542 | } else if (err) { |
1543 | f2fs_put_rpages_wbc(cc, wbc, redirty: true, unlock: 1); |
1544 | goto destroy_out; |
1545 | } |
1546 | |
1547 | err = f2fs_write_compressed_pages(cc, submitted, |
1548 | wbc, io_type); |
1549 | if (!err) |
1550 | return 0; |
1551 | f2fs_bug_on(F2FS_I_SB(cc->inode), err != -EAGAIN); |
1552 | } |
1553 | write: |
1554 | f2fs_bug_on(F2FS_I_SB(cc->inode), *submitted); |
1555 | |
1556 | err = f2fs_write_raw_pages(cc, submitted_p: submitted, wbc, io_type); |
1557 | f2fs_put_rpages_wbc(cc, wbc, redirty: false, unlock: 0); |
1558 | destroy_out: |
1559 | f2fs_destroy_compress_ctx(cc, reuse: false); |
1560 | return err; |
1561 | } |
1562 | |
1563 | static inline bool allow_memalloc_for_decomp(struct f2fs_sb_info *sbi, |
1564 | bool pre_alloc) |
1565 | { |
1566 | return pre_alloc ^ f2fs_low_mem_mode(sbi); |
1567 | } |
1568 | |
1569 | static int f2fs_prepare_decomp_mem(struct decompress_io_ctx *dic, |
1570 | bool pre_alloc) |
1571 | { |
1572 | const struct f2fs_compress_ops *cops = |
1573 | f2fs_cops[F2FS_I(inode: dic->inode)->i_compress_algorithm]; |
1574 | int i; |
1575 | |
1576 | if (!allow_memalloc_for_decomp(sbi: F2FS_I_SB(inode: dic->inode), pre_alloc)) |
1577 | return 0; |
1578 | |
1579 | dic->tpages = page_array_alloc(inode: dic->inode, nr: dic->cluster_size); |
1580 | if (!dic->tpages) |
1581 | return -ENOMEM; |
1582 | |
1583 | for (i = 0; i < dic->cluster_size; i++) { |
1584 | if (dic->rpages[i]) { |
1585 | dic->tpages[i] = dic->rpages[i]; |
1586 | continue; |
1587 | } |
1588 | |
1589 | dic->tpages[i] = f2fs_compress_alloc_page(); |
1590 | } |
1591 | |
1592 | dic->rbuf = f2fs_vmap(pages: dic->tpages, count: dic->cluster_size); |
1593 | if (!dic->rbuf) |
1594 | return -ENOMEM; |
1595 | |
1596 | dic->cbuf = f2fs_vmap(pages: dic->cpages, count: dic->nr_cpages); |
1597 | if (!dic->cbuf) |
1598 | return -ENOMEM; |
1599 | |
1600 | if (cops->init_decompress_ctx) |
1601 | return cops->init_decompress_ctx(dic); |
1602 | |
1603 | return 0; |
1604 | } |
1605 | |
1606 | static void f2fs_release_decomp_mem(struct decompress_io_ctx *dic, |
1607 | bool bypass_destroy_callback, bool pre_alloc) |
1608 | { |
1609 | const struct f2fs_compress_ops *cops = |
1610 | f2fs_cops[F2FS_I(inode: dic->inode)->i_compress_algorithm]; |
1611 | |
1612 | if (!allow_memalloc_for_decomp(sbi: F2FS_I_SB(inode: dic->inode), pre_alloc)) |
1613 | return; |
1614 | |
1615 | if (!bypass_destroy_callback && cops->destroy_decompress_ctx) |
1616 | cops->destroy_decompress_ctx(dic); |
1617 | |
1618 | if (dic->cbuf) |
1619 | vm_unmap_ram(mem: dic->cbuf, count: dic->nr_cpages); |
1620 | |
1621 | if (dic->rbuf) |
1622 | vm_unmap_ram(mem: dic->rbuf, count: dic->cluster_size); |
1623 | } |
1624 | |
1625 | static void f2fs_free_dic(struct decompress_io_ctx *dic, |
1626 | bool bypass_destroy_callback); |
1627 | |
1628 | struct decompress_io_ctx *f2fs_alloc_dic(struct compress_ctx *cc) |
1629 | { |
1630 | struct decompress_io_ctx *dic; |
1631 | pgoff_t start_idx = start_idx_of_cluster(cc); |
1632 | struct f2fs_sb_info *sbi = F2FS_I_SB(inode: cc->inode); |
1633 | int i, ret; |
1634 | |
1635 | dic = f2fs_kmem_cache_alloc(cachep: dic_entry_slab, GFP_F2FS_ZERO, nofail: false, sbi); |
1636 | if (!dic) |
1637 | return ERR_PTR(error: -ENOMEM); |
1638 | |
1639 | dic->rpages = page_array_alloc(inode: cc->inode, nr: cc->cluster_size); |
1640 | if (!dic->rpages) { |
1641 | kmem_cache_free(s: dic_entry_slab, objp: dic); |
1642 | return ERR_PTR(error: -ENOMEM); |
1643 | } |
1644 | |
1645 | dic->magic = F2FS_COMPRESSED_PAGE_MAGIC; |
1646 | dic->inode = cc->inode; |
1647 | atomic_set(v: &dic->remaining_pages, i: cc->nr_cpages); |
1648 | dic->cluster_idx = cc->cluster_idx; |
1649 | dic->cluster_size = cc->cluster_size; |
1650 | dic->log_cluster_size = cc->log_cluster_size; |
1651 | dic->nr_cpages = cc->nr_cpages; |
1652 | refcount_set(r: &dic->refcnt, n: 1); |
1653 | dic->failed = false; |
1654 | dic->need_verity = f2fs_need_verity(inode: cc->inode, idx: start_idx); |
1655 | |
1656 | for (i = 0; i < dic->cluster_size; i++) |
1657 | dic->rpages[i] = cc->rpages[i]; |
1658 | dic->nr_rpages = cc->cluster_size; |
1659 | |
1660 | dic->cpages = page_array_alloc(inode: dic->inode, nr: dic->nr_cpages); |
1661 | if (!dic->cpages) { |
1662 | ret = -ENOMEM; |
1663 | goto out_free; |
1664 | } |
1665 | |
1666 | for (i = 0; i < dic->nr_cpages; i++) { |
1667 | struct page *page; |
1668 | |
1669 | page = f2fs_compress_alloc_page(); |
1670 | f2fs_set_compressed_page(page, inode: cc->inode, |
1671 | index: start_idx + i + 1, data: dic); |
1672 | dic->cpages[i] = page; |
1673 | } |
1674 | |
1675 | ret = f2fs_prepare_decomp_mem(dic, pre_alloc: true); |
1676 | if (ret) |
1677 | goto out_free; |
1678 | |
1679 | return dic; |
1680 | |
1681 | out_free: |
1682 | f2fs_free_dic(dic, bypass_destroy_callback: true); |
1683 | return ERR_PTR(error: ret); |
1684 | } |
1685 | |
1686 | static void f2fs_free_dic(struct decompress_io_ctx *dic, |
1687 | bool bypass_destroy_callback) |
1688 | { |
1689 | int i; |
1690 | |
1691 | f2fs_release_decomp_mem(dic, bypass_destroy_callback, pre_alloc: true); |
1692 | |
1693 | if (dic->tpages) { |
1694 | for (i = 0; i < dic->cluster_size; i++) { |
1695 | if (dic->rpages[i]) |
1696 | continue; |
1697 | if (!dic->tpages[i]) |
1698 | continue; |
1699 | f2fs_compress_free_page(page: dic->tpages[i]); |
1700 | } |
1701 | page_array_free(inode: dic->inode, pages: dic->tpages, nr: dic->cluster_size); |
1702 | } |
1703 | |
1704 | if (dic->cpages) { |
1705 | for (i = 0; i < dic->nr_cpages; i++) { |
1706 | if (!dic->cpages[i]) |
1707 | continue; |
1708 | f2fs_compress_free_page(page: dic->cpages[i]); |
1709 | } |
1710 | page_array_free(inode: dic->inode, pages: dic->cpages, nr: dic->nr_cpages); |
1711 | } |
1712 | |
1713 | page_array_free(inode: dic->inode, pages: dic->rpages, nr: dic->nr_rpages); |
1714 | kmem_cache_free(s: dic_entry_slab, objp: dic); |
1715 | } |
1716 | |
1717 | static void f2fs_late_free_dic(struct work_struct *work) |
1718 | { |
1719 | struct decompress_io_ctx *dic = |
1720 | container_of(work, struct decompress_io_ctx, free_work); |
1721 | |
1722 | f2fs_free_dic(dic, bypass_destroy_callback: false); |
1723 | } |
1724 | |
1725 | static void f2fs_put_dic(struct decompress_io_ctx *dic, bool in_task) |
1726 | { |
1727 | if (refcount_dec_and_test(r: &dic->refcnt)) { |
1728 | if (in_task) { |
1729 | f2fs_free_dic(dic, bypass_destroy_callback: false); |
1730 | } else { |
1731 | INIT_WORK(&dic->free_work, f2fs_late_free_dic); |
1732 | queue_work(wq: F2FS_I_SB(inode: dic->inode)->post_read_wq, |
1733 | work: &dic->free_work); |
1734 | } |
1735 | } |
1736 | } |
1737 | |
1738 | static void f2fs_verify_cluster(struct work_struct *work) |
1739 | { |
1740 | struct decompress_io_ctx *dic = |
1741 | container_of(work, struct decompress_io_ctx, verity_work); |
1742 | int i; |
1743 | |
1744 | /* Verify, update, and unlock the decompressed pages. */ |
1745 | for (i = 0; i < dic->cluster_size; i++) { |
1746 | struct page *rpage = dic->rpages[i]; |
1747 | |
1748 | if (!rpage) |
1749 | continue; |
1750 | |
1751 | if (fsverity_verify_page(page: rpage)) |
1752 | SetPageUptodate(rpage); |
1753 | else |
1754 | ClearPageUptodate(page: rpage); |
1755 | unlock_page(page: rpage); |
1756 | } |
1757 | |
1758 | f2fs_put_dic(dic, in_task: true); |
1759 | } |
1760 | |
1761 | /* |
1762 | * This is called when a compressed cluster has been decompressed |
1763 | * (or failed to be read and/or decompressed). |
1764 | */ |
1765 | void f2fs_decompress_end_io(struct decompress_io_ctx *dic, bool failed, |
1766 | bool in_task) |
1767 | { |
1768 | int i; |
1769 | |
1770 | if (!failed && dic->need_verity) { |
1771 | /* |
1772 | * Note that to avoid deadlocks, the verity work can't be done |
1773 | * on the decompression workqueue. This is because verifying |
1774 | * the data pages can involve reading metadata pages from the |
1775 | * file, and these metadata pages may be compressed. |
1776 | */ |
1777 | INIT_WORK(&dic->verity_work, f2fs_verify_cluster); |
1778 | fsverity_enqueue_verify_work(work: &dic->verity_work); |
1779 | return; |
1780 | } |
1781 | |
1782 | /* Update and unlock the cluster's pagecache pages. */ |
1783 | for (i = 0; i < dic->cluster_size; i++) { |
1784 | struct page *rpage = dic->rpages[i]; |
1785 | |
1786 | if (!rpage) |
1787 | continue; |
1788 | |
1789 | if (failed) |
1790 | ClearPageUptodate(page: rpage); |
1791 | else |
1792 | SetPageUptodate(rpage); |
1793 | unlock_page(page: rpage); |
1794 | } |
1795 | |
1796 | /* |
1797 | * Release the reference to the decompress_io_ctx that was being held |
1798 | * for I/O completion. |
1799 | */ |
1800 | f2fs_put_dic(dic, in_task); |
1801 | } |
1802 | |
1803 | /* |
1804 | * Put a reference to a compressed page's decompress_io_ctx. |
1805 | * |
1806 | * This is called when the page is no longer needed and can be freed. |
1807 | */ |
1808 | void f2fs_put_page_dic(struct page *page, bool in_task) |
1809 | { |
1810 | struct decompress_io_ctx *dic = |
1811 | (struct decompress_io_ctx *)page_private(page); |
1812 | |
1813 | f2fs_put_dic(dic, in_task); |
1814 | } |
1815 | |
1816 | /* |
1817 | * check whether cluster blocks are contiguous, and add extent cache entry |
1818 | * only if cluster blocks are logically and physically contiguous. |
1819 | */ |
1820 | unsigned int f2fs_cluster_blocks_are_contiguous(struct dnode_of_data *dn, |
1821 | unsigned int ofs_in_node) |
1822 | { |
1823 | bool compressed = data_blkaddr(inode: dn->inode, node_page: dn->node_page, |
1824 | offset: ofs_in_node) == COMPRESS_ADDR; |
1825 | int i = compressed ? 1 : 0; |
1826 | block_t first_blkaddr = data_blkaddr(inode: dn->inode, node_page: dn->node_page, |
1827 | offset: ofs_in_node + i); |
1828 | |
1829 | for (i += 1; i < F2FS_I(inode: dn->inode)->i_cluster_size; i++) { |
1830 | block_t blkaddr = data_blkaddr(inode: dn->inode, node_page: dn->node_page, |
1831 | offset: ofs_in_node + i); |
1832 | |
1833 | if (!__is_valid_data_blkaddr(blkaddr)) |
1834 | break; |
1835 | if (first_blkaddr + i - (compressed ? 1 : 0) != blkaddr) |
1836 | return 0; |
1837 | } |
1838 | |
1839 | return compressed ? i - 1 : i; |
1840 | } |
1841 | |
1842 | const struct address_space_operations f2fs_compress_aops = { |
1843 | .release_folio = f2fs_release_folio, |
1844 | .invalidate_folio = f2fs_invalidate_folio, |
1845 | .migrate_folio = filemap_migrate_folio, |
1846 | }; |
1847 | |
1848 | struct address_space *COMPRESS_MAPPING(struct f2fs_sb_info *sbi) |
1849 | { |
1850 | return sbi->compress_inode->i_mapping; |
1851 | } |
1852 | |
1853 | void f2fs_invalidate_compress_page(struct f2fs_sb_info *sbi, block_t blkaddr) |
1854 | { |
1855 | if (!sbi->compress_inode) |
1856 | return; |
1857 | invalidate_mapping_pages(mapping: COMPRESS_MAPPING(sbi), start: blkaddr, end: blkaddr); |
1858 | } |
1859 | |
1860 | void f2fs_cache_compressed_page(struct f2fs_sb_info *sbi, struct page *page, |
1861 | nid_t ino, block_t blkaddr) |
1862 | { |
1863 | struct page *cpage; |
1864 | int ret; |
1865 | |
1866 | if (!test_opt(sbi, COMPRESS_CACHE)) |
1867 | return; |
1868 | |
1869 | if (!f2fs_is_valid_blkaddr(sbi, blkaddr, type: DATA_GENERIC_ENHANCE_READ)) |
1870 | return; |
1871 | |
1872 | if (!f2fs_available_free_memory(sbi, type: COMPRESS_PAGE)) |
1873 | return; |
1874 | |
1875 | cpage = find_get_page(mapping: COMPRESS_MAPPING(sbi), offset: blkaddr); |
1876 | if (cpage) { |
1877 | f2fs_put_page(page: cpage, unlock: 0); |
1878 | return; |
1879 | } |
1880 | |
1881 | cpage = alloc_page(__GFP_NOWARN | __GFP_IO); |
1882 | if (!cpage) |
1883 | return; |
1884 | |
1885 | ret = add_to_page_cache_lru(page: cpage, mapping: COMPRESS_MAPPING(sbi), |
1886 | index: blkaddr, GFP_NOFS); |
1887 | if (ret) { |
1888 | f2fs_put_page(page: cpage, unlock: 0); |
1889 | return; |
1890 | } |
1891 | |
1892 | set_page_private_data(page: cpage, data: ino); |
1893 | |
1894 | memcpy(page_address(cpage), page_address(page), PAGE_SIZE); |
1895 | SetPageUptodate(cpage); |
1896 | f2fs_put_page(page: cpage, unlock: 1); |
1897 | } |
1898 | |
1899 | bool f2fs_load_compressed_page(struct f2fs_sb_info *sbi, struct page *page, |
1900 | block_t blkaddr) |
1901 | { |
1902 | struct page *cpage; |
1903 | bool hitted = false; |
1904 | |
1905 | if (!test_opt(sbi, COMPRESS_CACHE)) |
1906 | return false; |
1907 | |
1908 | cpage = f2fs_pagecache_get_page(mapping: COMPRESS_MAPPING(sbi), |
1909 | index: blkaddr, FGP_LOCK | FGP_NOWAIT, GFP_NOFS); |
1910 | if (cpage) { |
1911 | if (PageUptodate(page: cpage)) { |
1912 | atomic_inc(v: &sbi->compress_page_hit); |
1913 | memcpy(page_address(page), |
1914 | page_address(cpage), PAGE_SIZE); |
1915 | hitted = true; |
1916 | } |
1917 | f2fs_put_page(page: cpage, unlock: 1); |
1918 | } |
1919 | |
1920 | return hitted; |
1921 | } |
1922 | |
1923 | void f2fs_invalidate_compress_pages(struct f2fs_sb_info *sbi, nid_t ino) |
1924 | { |
1925 | struct address_space *mapping = COMPRESS_MAPPING(sbi); |
1926 | struct folio_batch fbatch; |
1927 | pgoff_t index = 0; |
1928 | pgoff_t end = MAX_BLKADDR(sbi); |
1929 | |
1930 | if (!mapping->nrpages) |
1931 | return; |
1932 | |
1933 | folio_batch_init(fbatch: &fbatch); |
1934 | |
1935 | do { |
1936 | unsigned int nr, i; |
1937 | |
1938 | nr = filemap_get_folios(mapping, start: &index, end: end - 1, fbatch: &fbatch); |
1939 | if (!nr) |
1940 | break; |
1941 | |
1942 | for (i = 0; i < nr; i++) { |
1943 | struct folio *folio = fbatch.folios[i]; |
1944 | |
1945 | folio_lock(folio); |
1946 | if (folio->mapping != mapping) { |
1947 | folio_unlock(folio); |
1948 | continue; |
1949 | } |
1950 | |
1951 | if (ino != get_page_private_data(page: &folio->page)) { |
1952 | folio_unlock(folio); |
1953 | continue; |
1954 | } |
1955 | |
1956 | generic_error_remove_folio(mapping, folio); |
1957 | folio_unlock(folio); |
1958 | } |
1959 | folio_batch_release(fbatch: &fbatch); |
1960 | cond_resched(); |
1961 | } while (index < end); |
1962 | } |
1963 | |
1964 | int f2fs_init_compress_inode(struct f2fs_sb_info *sbi) |
1965 | { |
1966 | struct inode *inode; |
1967 | |
1968 | if (!test_opt(sbi, COMPRESS_CACHE)) |
1969 | return 0; |
1970 | |
1971 | inode = f2fs_iget(sb: sbi->sb, F2FS_COMPRESS_INO(sbi)); |
1972 | if (IS_ERR(ptr: inode)) |
1973 | return PTR_ERR(ptr: inode); |
1974 | sbi->compress_inode = inode; |
1975 | |
1976 | sbi->compress_percent = COMPRESS_PERCENT; |
1977 | sbi->compress_watermark = COMPRESS_WATERMARK; |
1978 | |
1979 | atomic_set(v: &sbi->compress_page_hit, i: 0); |
1980 | |
1981 | return 0; |
1982 | } |
1983 | |
1984 | void f2fs_destroy_compress_inode(struct f2fs_sb_info *sbi) |
1985 | { |
1986 | if (!sbi->compress_inode) |
1987 | return; |
1988 | iput(sbi->compress_inode); |
1989 | sbi->compress_inode = NULL; |
1990 | } |
1991 | |
1992 | int f2fs_init_page_array_cache(struct f2fs_sb_info *sbi) |
1993 | { |
1994 | dev_t dev = sbi->sb->s_bdev->bd_dev; |
1995 | char slab_name[35]; |
1996 | |
1997 | if (!f2fs_sb_has_compression(sbi)) |
1998 | return 0; |
1999 | |
2000 | sprintf(buf: slab_name, fmt: "f2fs_page_array_entry-%u:%u" , MAJOR(dev), MINOR(dev)); |
2001 | |
2002 | sbi->page_array_slab_size = sizeof(struct page *) << |
2003 | F2FS_OPTION(sbi).compress_log_size; |
2004 | |
2005 | sbi->page_array_slab = f2fs_kmem_cache_create(name: slab_name, |
2006 | size: sbi->page_array_slab_size); |
2007 | return sbi->page_array_slab ? 0 : -ENOMEM; |
2008 | } |
2009 | |
2010 | void f2fs_destroy_page_array_cache(struct f2fs_sb_info *sbi) |
2011 | { |
2012 | kmem_cache_destroy(s: sbi->page_array_slab); |
2013 | } |
2014 | |
2015 | int __init f2fs_init_compress_cache(void) |
2016 | { |
2017 | cic_entry_slab = f2fs_kmem_cache_create(name: "f2fs_cic_entry" , |
2018 | size: sizeof(struct compress_io_ctx)); |
2019 | if (!cic_entry_slab) |
2020 | return -ENOMEM; |
2021 | dic_entry_slab = f2fs_kmem_cache_create(name: "f2fs_dic_entry" , |
2022 | size: sizeof(struct decompress_io_ctx)); |
2023 | if (!dic_entry_slab) |
2024 | goto free_cic; |
2025 | return 0; |
2026 | free_cic: |
2027 | kmem_cache_destroy(s: cic_entry_slab); |
2028 | return -ENOMEM; |
2029 | } |
2030 | |
2031 | void f2fs_destroy_compress_cache(void) |
2032 | { |
2033 | kmem_cache_destroy(s: dic_entry_slab); |
2034 | kmem_cache_destroy(s: cic_entry_slab); |
2035 | } |
2036 | |