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c1d7c514 | 1 | // SPDX-License-Identifier: GPL-2.0 |
c8b97818 CM |
2 | /* |
3 | * Copyright (C) 2008 Oracle. All rights reserved. | |
4 | * | |
c8b97818 CM |
5 | * Based on jffs2 zlib code: |
6 | * Copyright © 2001-2007 Red Hat, Inc. | |
7 | * Created by David Woodhouse <dwmw2@infradead.org> | |
8 | */ | |
9 | ||
10 | #include <linux/kernel.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/zlib.h> | |
13 | #include <linux/zutil.h> | |
6acafd1e | 14 | #include <linux/mm.h> |
c8b97818 CM |
15 | #include <linux/init.h> |
16 | #include <linux/err.h> | |
17 | #include <linux/sched.h> | |
18 | #include <linux/pagemap.h> | |
19 | #include <linux/bio.h> | |
e1ddce71 | 20 | #include <linux/refcount.h> |
b2950863 | 21 | #include "compression.h" |
c8b97818 | 22 | |
c8b97818 | 23 | struct workspace { |
78809913 | 24 | z_stream strm; |
c8b97818 CM |
25 | char *buf; |
26 | struct list_head list; | |
f51d2b59 | 27 | int level; |
c8b97818 CM |
28 | }; |
29 | ||
92ee5530 DZ |
30 | static struct workspace_manager wsm; |
31 | ||
32 | static void zlib_init_workspace_manager(void) | |
33 | { | |
34 | btrfs_init_workspace_manager(&wsm, &btrfs_zlib_compress); | |
35 | } | |
36 | ||
37 | static void zlib_cleanup_workspace_manager(void) | |
38 | { | |
39 | btrfs_cleanup_workspace_manager(&wsm); | |
40 | } | |
41 | ||
7bf49943 | 42 | static struct list_head *zlib_get_workspace(unsigned int level) |
92ee5530 | 43 | { |
d0ab62ce DZ |
44 | struct list_head *ws = btrfs_get_workspace(&wsm, level); |
45 | struct workspace *workspace = list_entry(ws, struct workspace, list); | |
46 | ||
47 | workspace->level = level; | |
48 | ||
49 | return ws; | |
92ee5530 DZ |
50 | } |
51 | ||
52 | static void zlib_put_workspace(struct list_head *ws) | |
53 | { | |
54 | btrfs_put_workspace(&wsm, ws); | |
55 | } | |
56 | ||
261507a0 LZ |
57 | static void zlib_free_workspace(struct list_head *ws) |
58 | { | |
59 | struct workspace *workspace = list_entry(ws, struct workspace, list); | |
c8b97818 | 60 | |
6acafd1e | 61 | kvfree(workspace->strm.workspace); |
261507a0 LZ |
62 | kfree(workspace->buf); |
63 | kfree(workspace); | |
64 | } | |
65 | ||
7bf49943 | 66 | static struct list_head *zlib_alloc_workspace(unsigned int level) |
c8b97818 CM |
67 | { |
68 | struct workspace *workspace; | |
78809913 | 69 | int workspacesize; |
8844355d | 70 | |
389a6cfc | 71 | workspace = kzalloc(sizeof(*workspace), GFP_KERNEL); |
261507a0 LZ |
72 | if (!workspace) |
73 | return ERR_PTR(-ENOMEM); | |
c8b97818 | 74 | |
78809913 SS |
75 | workspacesize = max(zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL), |
76 | zlib_inflate_workspacesize()); | |
6acafd1e | 77 | workspace->strm.workspace = kvmalloc(workspacesize, GFP_KERNEL); |
7bf49943 | 78 | workspace->level = level; |
389a6cfc | 79 | workspace->buf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
78809913 | 80 | if (!workspace->strm.workspace || !workspace->buf) |
261507a0 | 81 | goto fail; |
c8b97818 | 82 | |
261507a0 | 83 | INIT_LIST_HEAD(&workspace->list); |
c8b97818 | 84 | |
261507a0 LZ |
85 | return &workspace->list; |
86 | fail: | |
87 | zlib_free_workspace(&workspace->list); | |
88 | return ERR_PTR(-ENOMEM); | |
c8b97818 CM |
89 | } |
90 | ||
261507a0 LZ |
91 | static int zlib_compress_pages(struct list_head *ws, |
92 | struct address_space *mapping, | |
38c31464 | 93 | u64 start, |
261507a0 | 94 | struct page **pages, |
261507a0 LZ |
95 | unsigned long *out_pages, |
96 | unsigned long *total_in, | |
e5d74902 | 97 | unsigned long *total_out) |
c8b97818 | 98 | { |
261507a0 | 99 | struct workspace *workspace = list_entry(ws, struct workspace, list); |
c8b97818 | 100 | int ret; |
c8b97818 CM |
101 | char *data_in; |
102 | char *cpage_out; | |
103 | int nr_pages = 0; | |
104 | struct page *in_page = NULL; | |
105 | struct page *out_page = NULL; | |
c8b97818 | 106 | unsigned long bytes_left; |
38c31464 | 107 | unsigned long len = *total_out; |
4d3a800e | 108 | unsigned long nr_dest_pages = *out_pages; |
e5d74902 | 109 | const unsigned long max_out = nr_dest_pages * PAGE_SIZE; |
c8b97818 CM |
110 | |
111 | *out_pages = 0; | |
112 | *total_out = 0; | |
113 | *total_in = 0; | |
114 | ||
f51d2b59 | 115 | if (Z_OK != zlib_deflateInit(&workspace->strm, workspace->level)) { |
62e85577 | 116 | pr_warn("BTRFS: deflateInit failed\n"); |
60e1975a | 117 | ret = -EIO; |
c8b97818 CM |
118 | goto out; |
119 | } | |
120 | ||
78809913 SS |
121 | workspace->strm.total_in = 0; |
122 | workspace->strm.total_out = 0; | |
c8b97818 | 123 | |
09cbfeaf | 124 | in_page = find_get_page(mapping, start >> PAGE_SHIFT); |
c8b97818 CM |
125 | data_in = kmap(in_page); |
126 | ||
127 | out_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM); | |
4b72029d | 128 | if (out_page == NULL) { |
60e1975a | 129 | ret = -ENOMEM; |
4b72029d LZ |
130 | goto out; |
131 | } | |
c8b97818 CM |
132 | cpage_out = kmap(out_page); |
133 | pages[0] = out_page; | |
134 | nr_pages = 1; | |
135 | ||
78809913 SS |
136 | workspace->strm.next_in = data_in; |
137 | workspace->strm.next_out = cpage_out; | |
09cbfeaf KS |
138 | workspace->strm.avail_out = PAGE_SIZE; |
139 | workspace->strm.avail_in = min(len, PAGE_SIZE); | |
c8b97818 | 140 | |
78809913 SS |
141 | while (workspace->strm.total_in < len) { |
142 | ret = zlib_deflate(&workspace->strm, Z_SYNC_FLUSH); | |
c8b97818 | 143 | if (ret != Z_OK) { |
62e85577 | 144 | pr_debug("BTRFS: deflate in loop returned %d\n", |
c8b97818 | 145 | ret); |
78809913 | 146 | zlib_deflateEnd(&workspace->strm); |
60e1975a | 147 | ret = -EIO; |
c8b97818 CM |
148 | goto out; |
149 | } | |
150 | ||
151 | /* we're making it bigger, give up */ | |
78809913 SS |
152 | if (workspace->strm.total_in > 8192 && |
153 | workspace->strm.total_in < | |
154 | workspace->strm.total_out) { | |
130d5b41 | 155 | ret = -E2BIG; |
c8b97818 CM |
156 | goto out; |
157 | } | |
158 | /* we need another page for writing out. Test this | |
159 | * before the total_in so we will pull in a new page for | |
160 | * the stream end if required | |
161 | */ | |
78809913 | 162 | if (workspace->strm.avail_out == 0) { |
c8b97818 CM |
163 | kunmap(out_page); |
164 | if (nr_pages == nr_dest_pages) { | |
165 | out_page = NULL; | |
60e1975a | 166 | ret = -E2BIG; |
c8b97818 CM |
167 | goto out; |
168 | } | |
169 | out_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM); | |
4b72029d | 170 | if (out_page == NULL) { |
60e1975a | 171 | ret = -ENOMEM; |
4b72029d LZ |
172 | goto out; |
173 | } | |
c8b97818 CM |
174 | cpage_out = kmap(out_page); |
175 | pages[nr_pages] = out_page; | |
176 | nr_pages++; | |
09cbfeaf | 177 | workspace->strm.avail_out = PAGE_SIZE; |
78809913 | 178 | workspace->strm.next_out = cpage_out; |
c8b97818 CM |
179 | } |
180 | /* we're all done */ | |
78809913 | 181 | if (workspace->strm.total_in >= len) |
c8b97818 CM |
182 | break; |
183 | ||
184 | /* we've read in a full page, get a new one */ | |
78809913 SS |
185 | if (workspace->strm.avail_in == 0) { |
186 | if (workspace->strm.total_out > max_out) | |
c8b97818 CM |
187 | break; |
188 | ||
78809913 | 189 | bytes_left = len - workspace->strm.total_in; |
c8b97818 | 190 | kunmap(in_page); |
09cbfeaf | 191 | put_page(in_page); |
c8b97818 | 192 | |
09cbfeaf | 193 | start += PAGE_SIZE; |
c8b97818 | 194 | in_page = find_get_page(mapping, |
09cbfeaf | 195 | start >> PAGE_SHIFT); |
c8b97818 | 196 | data_in = kmap(in_page); |
78809913 | 197 | workspace->strm.avail_in = min(bytes_left, |
09cbfeaf | 198 | PAGE_SIZE); |
78809913 | 199 | workspace->strm.next_in = data_in; |
c8b97818 CM |
200 | } |
201 | } | |
78809913 SS |
202 | workspace->strm.avail_in = 0; |
203 | ret = zlib_deflate(&workspace->strm, Z_FINISH); | |
204 | zlib_deflateEnd(&workspace->strm); | |
c8b97818 CM |
205 | |
206 | if (ret != Z_STREAM_END) { | |
60e1975a | 207 | ret = -EIO; |
c8b97818 CM |
208 | goto out; |
209 | } | |
210 | ||
78809913 | 211 | if (workspace->strm.total_out >= workspace->strm.total_in) { |
60e1975a | 212 | ret = -E2BIG; |
c8b97818 CM |
213 | goto out; |
214 | } | |
215 | ||
216 | ret = 0; | |
78809913 SS |
217 | *total_out = workspace->strm.total_out; |
218 | *total_in = workspace->strm.total_in; | |
c8b97818 CM |
219 | out: |
220 | *out_pages = nr_pages; | |
221 | if (out_page) | |
222 | kunmap(out_page); | |
223 | ||
224 | if (in_page) { | |
225 | kunmap(in_page); | |
09cbfeaf | 226 | put_page(in_page); |
c8b97818 | 227 | } |
c8b97818 CM |
228 | return ret; |
229 | } | |
230 | ||
e1ddce71 | 231 | static int zlib_decompress_bio(struct list_head *ws, struct compressed_bio *cb) |
c8b97818 | 232 | { |
261507a0 | 233 | struct workspace *workspace = list_entry(ws, struct workspace, list); |
3a39c18d | 234 | int ret = 0, ret2; |
c8b97818 | 235 | int wbits = MAX_WBITS; |
c8b97818 CM |
236 | char *data_in; |
237 | size_t total_out = 0; | |
c8b97818 | 238 | unsigned long page_in_index = 0; |
e1ddce71 | 239 | size_t srclen = cb->compressed_len; |
09cbfeaf | 240 | unsigned long total_pages_in = DIV_ROUND_UP(srclen, PAGE_SIZE); |
c8b97818 | 241 | unsigned long buf_start; |
e1ddce71 AJ |
242 | struct page **pages_in = cb->compressed_pages; |
243 | u64 disk_start = cb->start; | |
244 | struct bio *orig_bio = cb->orig_bio; | |
c8b97818 | 245 | |
c8b97818 | 246 | data_in = kmap(pages_in[page_in_index]); |
78809913 | 247 | workspace->strm.next_in = data_in; |
09cbfeaf | 248 | workspace->strm.avail_in = min_t(size_t, srclen, PAGE_SIZE); |
78809913 | 249 | workspace->strm.total_in = 0; |
c8b97818 | 250 | |
78809913 SS |
251 | workspace->strm.total_out = 0; |
252 | workspace->strm.next_out = workspace->buf; | |
09cbfeaf | 253 | workspace->strm.avail_out = PAGE_SIZE; |
c8b97818 CM |
254 | |
255 | /* If it's deflate, and it's got no preset dictionary, then | |
256 | we can tell zlib to skip the adler32 check. */ | |
257 | if (srclen > 2 && !(data_in[1] & PRESET_DICT) && | |
258 | ((data_in[0] & 0x0f) == Z_DEFLATED) && | |
259 | !(((data_in[0]<<8) + data_in[1]) % 31)) { | |
260 | ||
261 | wbits = -((data_in[0] >> 4) + 8); | |
78809913 SS |
262 | workspace->strm.next_in += 2; |
263 | workspace->strm.avail_in -= 2; | |
c8b97818 CM |
264 | } |
265 | ||
78809913 | 266 | if (Z_OK != zlib_inflateInit2(&workspace->strm, wbits)) { |
62e85577 | 267 | pr_warn("BTRFS: inflateInit failed\n"); |
d1111a75 | 268 | kunmap(pages_in[page_in_index]); |
60e1975a | 269 | return -EIO; |
c8b97818 | 270 | } |
78809913 SS |
271 | while (workspace->strm.total_in < srclen) { |
272 | ret = zlib_inflate(&workspace->strm, Z_NO_FLUSH); | |
d397712b | 273 | if (ret != Z_OK && ret != Z_STREAM_END) |
c8b97818 | 274 | break; |
c8b97818 | 275 | |
3a39c18d | 276 | buf_start = total_out; |
78809913 | 277 | total_out = workspace->strm.total_out; |
c8b97818 | 278 | |
3a39c18d LZ |
279 | /* we didn't make progress in this inflate call, we're done */ |
280 | if (buf_start == total_out) | |
c8b97818 | 281 | break; |
c8b97818 | 282 | |
3a39c18d LZ |
283 | ret2 = btrfs_decompress_buf2page(workspace->buf, buf_start, |
284 | total_out, disk_start, | |
974b1adc | 285 | orig_bio); |
3a39c18d LZ |
286 | if (ret2 == 0) { |
287 | ret = 0; | |
288 | goto done; | |
c8b97818 | 289 | } |
3a39c18d | 290 | |
78809913 | 291 | workspace->strm.next_out = workspace->buf; |
09cbfeaf | 292 | workspace->strm.avail_out = PAGE_SIZE; |
c8b97818 | 293 | |
78809913 | 294 | if (workspace->strm.avail_in == 0) { |
c8b97818 CM |
295 | unsigned long tmp; |
296 | kunmap(pages_in[page_in_index]); | |
297 | page_in_index++; | |
298 | if (page_in_index >= total_pages_in) { | |
299 | data_in = NULL; | |
300 | break; | |
301 | } | |
302 | data_in = kmap(pages_in[page_in_index]); | |
78809913 SS |
303 | workspace->strm.next_in = data_in; |
304 | tmp = srclen - workspace->strm.total_in; | |
305 | workspace->strm.avail_in = min(tmp, | |
09cbfeaf | 306 | PAGE_SIZE); |
c8b97818 CM |
307 | } |
308 | } | |
d397712b | 309 | if (ret != Z_STREAM_END) |
60e1975a | 310 | ret = -EIO; |
d397712b | 311 | else |
c8b97818 | 312 | ret = 0; |
c8b97818 | 313 | done: |
78809913 | 314 | zlib_inflateEnd(&workspace->strm); |
c8b97818 CM |
315 | if (data_in) |
316 | kunmap(pages_in[page_in_index]); | |
2f19cad9 | 317 | if (!ret) |
974b1adc | 318 | zero_fill_bio(orig_bio); |
c8b97818 CM |
319 | return ret; |
320 | } | |
321 | ||
261507a0 LZ |
322 | static int zlib_decompress(struct list_head *ws, unsigned char *data_in, |
323 | struct page *dest_page, | |
324 | unsigned long start_byte, | |
325 | size_t srclen, size_t destlen) | |
c8b97818 | 326 | { |
261507a0 | 327 | struct workspace *workspace = list_entry(ws, struct workspace, list); |
c8b97818 CM |
328 | int ret = 0; |
329 | int wbits = MAX_WBITS; | |
2f19cad9 | 330 | unsigned long bytes_left; |
c8b97818 | 331 | unsigned long total_out = 0; |
2f19cad9 | 332 | unsigned long pg_offset = 0; |
c8b97818 CM |
333 | char *kaddr; |
334 | ||
2f19cad9 CM |
335 | destlen = min_t(unsigned long, destlen, PAGE_SIZE); |
336 | bytes_left = destlen; | |
337 | ||
78809913 SS |
338 | workspace->strm.next_in = data_in; |
339 | workspace->strm.avail_in = srclen; | |
340 | workspace->strm.total_in = 0; | |
c8b97818 | 341 | |
78809913 | 342 | workspace->strm.next_out = workspace->buf; |
09cbfeaf | 343 | workspace->strm.avail_out = PAGE_SIZE; |
78809913 | 344 | workspace->strm.total_out = 0; |
c8b97818 CM |
345 | /* If it's deflate, and it's got no preset dictionary, then |
346 | we can tell zlib to skip the adler32 check. */ | |
347 | if (srclen > 2 && !(data_in[1] & PRESET_DICT) && | |
348 | ((data_in[0] & 0x0f) == Z_DEFLATED) && | |
349 | !(((data_in[0]<<8) + data_in[1]) % 31)) { | |
350 | ||
351 | wbits = -((data_in[0] >> 4) + 8); | |
78809913 SS |
352 | workspace->strm.next_in += 2; |
353 | workspace->strm.avail_in -= 2; | |
c8b97818 CM |
354 | } |
355 | ||
78809913 | 356 | if (Z_OK != zlib_inflateInit2(&workspace->strm, wbits)) { |
62e85577 | 357 | pr_warn("BTRFS: inflateInit failed\n"); |
60e1975a | 358 | return -EIO; |
c8b97818 CM |
359 | } |
360 | ||
d397712b | 361 | while (bytes_left > 0) { |
c8b97818 CM |
362 | unsigned long buf_start; |
363 | unsigned long buf_offset; | |
364 | unsigned long bytes; | |
c8b97818 | 365 | |
78809913 | 366 | ret = zlib_inflate(&workspace->strm, Z_NO_FLUSH); |
d397712b | 367 | if (ret != Z_OK && ret != Z_STREAM_END) |
c8b97818 | 368 | break; |
c8b97818 CM |
369 | |
370 | buf_start = total_out; | |
78809913 | 371 | total_out = workspace->strm.total_out; |
c8b97818 CM |
372 | |
373 | if (total_out == buf_start) { | |
60e1975a | 374 | ret = -EIO; |
c8b97818 CM |
375 | break; |
376 | } | |
377 | ||
d397712b | 378 | if (total_out <= start_byte) |
c8b97818 | 379 | goto next; |
c8b97818 | 380 | |
d397712b | 381 | if (total_out > start_byte && buf_start < start_byte) |
c8b97818 | 382 | buf_offset = start_byte - buf_start; |
d397712b | 383 | else |
c8b97818 | 384 | buf_offset = 0; |
c8b97818 | 385 | |
09cbfeaf KS |
386 | bytes = min(PAGE_SIZE - pg_offset, |
387 | PAGE_SIZE - buf_offset); | |
c8b97818 CM |
388 | bytes = min(bytes, bytes_left); |
389 | ||
7ac687d9 | 390 | kaddr = kmap_atomic(dest_page); |
c8b97818 | 391 | memcpy(kaddr + pg_offset, workspace->buf + buf_offset, bytes); |
7ac687d9 | 392 | kunmap_atomic(kaddr); |
c8b97818 CM |
393 | |
394 | pg_offset += bytes; | |
395 | bytes_left -= bytes; | |
396 | next: | |
78809913 | 397 | workspace->strm.next_out = workspace->buf; |
09cbfeaf | 398 | workspace->strm.avail_out = PAGE_SIZE; |
c8b97818 | 399 | } |
d397712b CM |
400 | |
401 | if (ret != Z_STREAM_END && bytes_left != 0) | |
60e1975a | 402 | ret = -EIO; |
d397712b | 403 | else |
c8b97818 | 404 | ret = 0; |
d397712b | 405 | |
78809913 | 406 | zlib_inflateEnd(&workspace->strm); |
2f19cad9 CM |
407 | |
408 | /* | |
409 | * this should only happen if zlib returned fewer bytes than we | |
410 | * expected. btrfs_get_block is responsible for zeroing from the | |
411 | * end of the inline extent (destlen) to the end of the page | |
412 | */ | |
413 | if (pg_offset < destlen) { | |
414 | kaddr = kmap_atomic(dest_page); | |
415 | memset(kaddr + pg_offset, 0, destlen - pg_offset); | |
416 | kunmap_atomic(kaddr); | |
417 | } | |
c8b97818 CM |
418 | return ret; |
419 | } | |
420 | ||
d0ab62ce | 421 | static unsigned int zlib_set_level(unsigned int level) |
f51d2b59 | 422 | { |
d0ab62ce DZ |
423 | if (!level) |
424 | return BTRFS_ZLIB_DEFAULT_LEVEL; | |
f51d2b59 | 425 | |
d0ab62ce | 426 | return min_t(unsigned int, level, 9); |
f51d2b59 DS |
427 | } |
428 | ||
e8c9f186 | 429 | const struct btrfs_compress_op btrfs_zlib_compress = { |
92ee5530 DZ |
430 | .init_workspace_manager = zlib_init_workspace_manager, |
431 | .cleanup_workspace_manager = zlib_cleanup_workspace_manager, | |
432 | .get_workspace = zlib_get_workspace, | |
433 | .put_workspace = zlib_put_workspace, | |
261507a0 LZ |
434 | .alloc_workspace = zlib_alloc_workspace, |
435 | .free_workspace = zlib_free_workspace, | |
436 | .compress_pages = zlib_compress_pages, | |
974b1adc | 437 | .decompress_bio = zlib_decompress_bio, |
261507a0 | 438 | .decompress = zlib_decompress, |
f51d2b59 | 439 | .set_level = zlib_set_level, |
261507a0 | 440 | }; |