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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/fs/btrfs/zlib.c
..
..
@@ -20,14 +20,30 @@
20
20
 #include <linux/refcount.h>
21
21
 #include "compression.h"
22
22
 
23
+/* workspace buffer size for s390 zlib hardware support */
24
+#define ZLIB_DFLTCC_BUF_SIZE    (4 * PAGE_SIZE)
25
+
23
26
 struct workspace {
24
27
 	z_stream strm;
25
28
 	char *buf;
29
+	unsigned int buf_size;
26
30
 	struct list_head list;
27
31
 	int level;
28
32
 };
29
33
 
30
-static void zlib_free_workspace(struct list_head *ws)
34
+static struct workspace_manager wsm;
35
+
36
+struct list_head *zlib_get_workspace(unsigned int level)
37
+{
38
+	struct list_head *ws = btrfs_get_workspace(BTRFS_COMPRESS_ZLIB, level);
39
+	struct workspace *workspace = list_entry(ws, struct workspace, list);
40
+
41
+	workspace->level = level;
42
+
43
+	return ws;
44
+}
45
+
46
+void zlib_free_workspace(struct list_head *ws)
31
47
 {
32
48
 	struct workspace *workspace = list_entry(ws, struct workspace, list);
33
49
 
..
..
@@ -36,7 +52,7 @@
36
52
 	kfree(workspace);
37
53
 }
38
54
 
39
-static struct list_head *zlib_alloc_workspace(void)
55
+struct list_head *zlib_alloc_workspace(unsigned int level)
40
56
 {
41
57
 	struct workspace *workspace;
42
58
 	int workspacesize;
..
..
@@ -47,8 +63,23 @@
47
63
 
48
64
 	workspacesize = max(zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL),
49
65
 			zlib_inflate_workspacesize());
50
-	workspace->strm.workspace = kvmalloc(workspacesize, GFP_KERNEL);
51
-	workspace->buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
66
+	workspace->strm.workspace = kvzalloc(workspacesize, GFP_KERNEL);
67
+	workspace->level = level;
68
+	workspace->buf = NULL;
69
+	/*
70
+	 * In case of s390 zlib hardware support, allocate lager workspace
71
+	 * buffer. If allocator fails, fall back to a single page buffer.
72
+	 */
73
+	if (zlib_deflate_dfltcc_enabled()) {
74
+		workspace->buf = kmalloc(ZLIB_DFLTCC_BUF_SIZE,
75
+					 __GFP_NOMEMALLOC | __GFP_NORETRY |
76
+					 __GFP_NOWARN | GFP_NOIO);
77
+		workspace->buf_size = ZLIB_DFLTCC_BUF_SIZE;
78
+	}
79
+	if (!workspace->buf) {
80
+		workspace->buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
81
+		workspace->buf_size = PAGE_SIZE;
82
+	}
52
83
 	if (!workspace->strm.workspace || !workspace->buf)
53
84
 		goto fail;
54
85
 
..
..
@@ -60,13 +91,9 @@
60
91
 	return ERR_PTR(-ENOMEM);
61
92
 }
62
93
 
63
-static int zlib_compress_pages(struct list_head *ws,
64
-			       struct address_space *mapping,
65
-			       u64 start,
66
-			       struct page **pages,
67
-			       unsigned long *out_pages,
68
-			       unsigned long *total_in,
69
-			       unsigned long *total_out)
94
+int zlib_compress_pages(struct list_head *ws, struct address_space *mapping,
95
+		u64 start, struct page **pages, unsigned long *out_pages,
96
+		unsigned long *total_in, unsigned long *total_out)
70
97
 {
71
98
 	struct workspace *workspace = list_entry(ws, struct workspace, list);
72
99
 	int ret;
..
..
@@ -76,6 +103,7 @@
76
103
 	struct page *in_page = NULL;
77
104
 	struct page *out_page = NULL;
78
105
 	unsigned long bytes_left;
106
+	unsigned int in_buf_pages;
79
107
 	unsigned long len = *total_out;
80
108
 	unsigned long nr_dest_pages = *out_pages;
81
109
 	const unsigned long max_out = nr_dest_pages * PAGE_SIZE;
..
..
@@ -93,9 +121,6 @@
93
121
 	workspace->strm.total_in = 0;
94
122
 	workspace->strm.total_out = 0;
95
123
 
96
-	in_page = find_get_page(mapping, start >> PAGE_SHIFT);
97
-	data_in = kmap(in_page);
98
-
99
124
 	out_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM);
100
125
 	if (out_page == NULL) {
101
126
 		ret = -ENOMEM;
..
..
@@ -105,12 +130,51 @@
105
130
 	pages[0] = out_page;
106
131
 	nr_pages = 1;
107
132
 
108
-	workspace->strm.next_in = data_in;
133
+	workspace->strm.next_in = workspace->buf;
134
+	workspace->strm.avail_in = 0;
109
135
 	workspace->strm.next_out = cpage_out;
110
136
 	workspace->strm.avail_out = PAGE_SIZE;
111
-	workspace->strm.avail_in = min(len, PAGE_SIZE);
112
137
 
113
138
 	while (workspace->strm.total_in < len) {
139
+		/*
140
+		 * Get next input pages and copy the contents to
141
+		 * the workspace buffer if required.
142
+		 */
143
+		if (workspace->strm.avail_in == 0) {
144
+			bytes_left = len - workspace->strm.total_in;
145
+			in_buf_pages = min(DIV_ROUND_UP(bytes_left, PAGE_SIZE),
146
+					   workspace->buf_size / PAGE_SIZE);
147
+			if (in_buf_pages > 1) {
148
+				int i;
149
+
150
+				for (i = 0; i < in_buf_pages; i++) {
151
+					if (in_page) {
152
+						kunmap(in_page);
153
+						put_page(in_page);
154
+					}
155
+					in_page = find_get_page(mapping,
156
+								start >> PAGE_SHIFT);
157
+					data_in = kmap(in_page);
158
+					memcpy(workspace->buf + i * PAGE_SIZE,
159
+					       data_in, PAGE_SIZE);
160
+					start += PAGE_SIZE;
161
+				}
162
+				workspace->strm.next_in = workspace->buf;
163
+			} else {
164
+				if (in_page) {
165
+					kunmap(in_page);
166
+					put_page(in_page);
167
+				}
168
+				in_page = find_get_page(mapping,
169
+							start >> PAGE_SHIFT);
170
+				data_in = kmap(in_page);
171
+				start += PAGE_SIZE;
172
+				workspace->strm.next_in = data_in;
173
+			}
174
+			workspace->strm.avail_in = min(bytes_left,
175
+						       (unsigned long) workspace->buf_size);
176
+		}
177
+
114
178
 		ret = zlib_deflate(&workspace->strm, Z_SYNC_FLUSH);
115
179
 		if (ret != Z_OK) {
116
180
 			pr_debug("BTRFS: deflate in loop returned %d\n",
..
..
@@ -152,33 +216,43 @@
152
216
 		/* we're all done */
153
217
 		if (workspace->strm.total_in >= len)
154
218
 			break;
155
-
156
-		/* we've read in a full page, get a new one */
157
-		if (workspace->strm.avail_in == 0) {
158
-			if (workspace->strm.total_out > max_out)
159
-				break;
160
-
161
-			bytes_left = len - workspace->strm.total_in;
162
-			kunmap(in_page);
163
-			put_page(in_page);
164
-
165
-			start += PAGE_SIZE;
166
-			in_page = find_get_page(mapping,
167
-						start >> PAGE_SHIFT);
168
-			data_in = kmap(in_page);
169
-			workspace->strm.avail_in = min(bytes_left,
170
-							   PAGE_SIZE);
171
-			workspace->strm.next_in = data_in;
172
-		}
219
+		if (workspace->strm.total_out > max_out)
220
+			break;
173
221
 	}
174
222
 	workspace->strm.avail_in = 0;
175
-	ret = zlib_deflate(&workspace->strm, Z_FINISH);
176
-	zlib_deflateEnd(&workspace->strm);
177
-
178
-	if (ret != Z_STREAM_END) {
179
-		ret = -EIO;
180
-		goto out;
223
+	/*
224
+	 * Call deflate with Z_FINISH flush parameter providing more output
225
+	 * space but no more input data, until it returns with Z_STREAM_END.
226
+	 */
227
+	while (ret != Z_STREAM_END) {
228
+		ret = zlib_deflate(&workspace->strm, Z_FINISH);
229
+		if (ret == Z_STREAM_END)
230
+			break;
231
+		if (ret != Z_OK && ret != Z_BUF_ERROR) {
232
+			zlib_deflateEnd(&workspace->strm);
233
+			ret = -EIO;
234
+			goto out;
235
+		} else if (workspace->strm.avail_out == 0) {
236
+			/* get another page for the stream end */
237
+			kunmap(out_page);
238
+			if (nr_pages == nr_dest_pages) {
239
+				out_page = NULL;
240
+				ret = -E2BIG;
241
+				goto out;
242
+			}
243
+			out_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM);
244
+			if (out_page == NULL) {
245
+				ret = -ENOMEM;
246
+				goto out;
247
+			}
248
+			cpage_out = kmap(out_page);
249
+			pages[nr_pages] = out_page;
250
+			nr_pages++;
251
+			workspace->strm.avail_out = PAGE_SIZE;
252
+			workspace->strm.next_out = cpage_out;
253
+		}
181
254
 	}
255
+	zlib_deflateEnd(&workspace->strm);
182
256
 
183
257
 	if (workspace->strm.total_out >= workspace->strm.total_in) {
184
258
 		ret = -E2BIG;
..
..
@@ -200,7 +274,7 @@
200
274
 	return ret;
201
275
 }
202
276
 
203
-static int zlib_decompress_bio(struct list_head *ws, struct compressed_bio *cb)
277
+int zlib_decompress_bio(struct list_head *ws, struct compressed_bio *cb)
204
278
 {
205
279
 	struct workspace *workspace = list_entry(ws, struct workspace, list);
206
280
 	int ret = 0, ret2;
..
..
@@ -222,7 +296,7 @@
222
296
 
223
297
 	workspace->strm.total_out = 0;
224
298
 	workspace->strm.next_out = workspace->buf;
225
-	workspace->strm.avail_out = PAGE_SIZE;
299
+	workspace->strm.avail_out = workspace->buf_size;
226
300
 
227
301
 	/* If it's deflate, and it's got no preset dictionary, then
228
302
 	   we can tell zlib to skip the adler32 check. */
..
..
@@ -261,7 +335,7 @@
261
335
 		}
262
336
 
263
337
 		workspace->strm.next_out = workspace->buf;
264
-		workspace->strm.avail_out = PAGE_SIZE;
338
+		workspace->strm.avail_out = workspace->buf_size;
265
339
 
266
340
 		if (workspace->strm.avail_in == 0) {
267
341
 			unsigned long tmp;
..
..
@@ -291,10 +365,9 @@
291
365
 	return ret;
292
366
 }
293
367
 
294
-static int zlib_decompress(struct list_head *ws, unsigned char *data_in,
295
-			   struct page *dest_page,
296
-			   unsigned long start_byte,
297
-			   size_t srclen, size_t destlen)
368
+int zlib_decompress(struct list_head *ws, unsigned char *data_in,
369
+		struct page *dest_page, unsigned long start_byte, size_t srclen,
370
+		size_t destlen)
298
371
 {
299
372
 	struct workspace *workspace = list_entry(ws, struct workspace, list);
300
373
 	int ret = 0;
..
..
@@ -312,7 +385,7 @@
312
385
 	workspace->strm.total_in = 0;
313
386
 
314
387
 	workspace->strm.next_out = workspace->buf;
315
-	workspace->strm.avail_out = PAGE_SIZE;
388
+	workspace->strm.avail_out = workspace->buf_size;
316
389
 	workspace->strm.total_out = 0;
317
390
 	/* If it's deflate, and it's got no preset dictionary, then
318
391
 	   we can tell zlib to skip the adler32 check. */
..
..
@@ -356,7 +429,7 @@
356
429
 			buf_offset = 0;
357
430
 
358
431
 		bytes = min(PAGE_SIZE - pg_offset,
359
-			    PAGE_SIZE - buf_offset);
432
+			    PAGE_SIZE - (buf_offset % PAGE_SIZE));
360
433
 		bytes = min(bytes, bytes_left);
361
434
 
362
435
 		kaddr = kmap_atomic(dest_page);
..
..
@@ -367,7 +440,7 @@
367
440
 		bytes_left -= bytes;
368
441
 next:
369
442
 		workspace->strm.next_out = workspace->buf;
370
-		workspace->strm.avail_out = PAGE_SIZE;
443
+		workspace->strm.avail_out = workspace->buf_size;
371
444
 	}
372
445
 
373
446
 	if (ret != Z_STREAM_END && bytes_left != 0)
..
..
@@ -390,22 +463,8 @@
390
463
 	return ret;
391
464
 }
392
465
 
393
-static void zlib_set_level(struct list_head *ws, unsigned int type)
394
-{
395
-	struct workspace *workspace = list_entry(ws, struct workspace, list);
396
-	unsigned level = (type & 0xF0) >> 4;
397
-
398
-	if (level > 9)
399
-		level = 9;
400
-
401
-	workspace->level = level > 0 ? level : 3;
402
-}
403
-
404
466
 const struct btrfs_compress_op btrfs_zlib_compress = {
405
-	.alloc_workspace	= zlib_alloc_workspace,
406
-	.free_workspace		= zlib_free_workspace,
407
-	.compress_pages		= zlib_compress_pages,
408
-	.decompress_bio		= zlib_decompress_bio,
409
-	.decompress		= zlib_decompress,
410
-	.set_level              = zlib_set_level,
467
+	.workspace_manager	= &wsm,
468
+	.max_level		= 9,
469
+	.default_level		= BTRFS_ZLIB_DEFAULT_LEVEL,
411
470
 };