fs/btrfs/zlib.c

27 	z_stream strm;
50 	kvfree(workspace->strm.workspace);
66 	workspace->strm.workspace = kvzalloc(workspacesize, GFP_KERNEL | __GFP_NOWARN);
83 	if (!workspace->strm.workspace || !workspace->buf)
115 	if (Z_OK != zlib_deflateInit(&workspace->strm, workspace->level)) {
121 	workspace->strm.total_in = 0;
122 	workspace->strm.total_out = 0;
133 	workspace->strm.next_in = workspace->buf;
134 	workspace->strm.avail_in = 0;
135 	workspace->strm.next_out = cpage_out;
136 	workspace->strm.avail_out = PAGE_SIZE;
138 	while (workspace->strm.total_in < len) {
143 		if (workspace->strm.avail_in == 0) {
144 			bytes_left = len - workspace->strm.total_in;
162 				workspace->strm.next_in = workspace->buf;
172 				workspace->strm.next_in = data_in;
174 			workspace->strm.avail_in = min(bytes_left,
178 		ret = zlib_deflate(&workspace->strm, Z_SYNC_FLUSH);
182 			zlib_deflateEnd(&workspace->strm);
188 		if (workspace->strm.total_in > 8192 &&
189 		    workspace->strm.total_in <
190 		    workspace->strm.total_out) {
198 		if (workspace->strm.avail_out == 0) {
211 			workspace->strm.avail_out = PAGE_SIZE;
212 			workspace->strm.next_out = cpage_out;
215 		if (workspace->strm.total_in >= len)
217 		if (workspace->strm.total_out > max_out)
220 	workspace->strm.avail_in = 0;
226 		ret = zlib_deflate(&workspace->strm, Z_FINISH);
230 			zlib_deflateEnd(&workspace->strm);
233 		} else if (workspace->strm.avail_out == 0) {
247 			workspace->strm.avail_out = PAGE_SIZE;
248 			workspace->strm.next_out = cpage_out;
251 	zlib_deflateEnd(&workspace->strm);
253 	if (workspace->strm.total_out >= workspace->strm.total_in) {
259 	*total_out = workspace->strm.total_out;
260 	*total_in = workspace->strm.total_in;
285 	workspace->strm.next_in = data_in;
286 	workspace->strm.avail_in = min_t(size_t, srclen, PAGE_SIZE);
287 	workspace->strm.total_in = 0;
289 	workspace->strm.total_out = 0;
290 	workspace->strm.next_out = workspace->buf;
291 	workspace->strm.avail_out = workspace->buf_size;
300 		workspace->strm.next_in += 2;
301 		workspace->strm.avail_in -= 2;
304 	if (Z_OK != zlib_inflateInit2(&workspace->strm, wbits)) {
309 	while (workspace->strm.total_in < srclen) {
310 		ret = zlib_inflate(&workspace->strm, Z_NO_FLUSH);
315 		total_out = workspace->strm.total_out;
328 		workspace->strm.next_out = workspace->buf;
329 		workspace->strm.avail_out = workspace->buf_size;
331 		if (workspace->strm.avail_in == 0) {
340 			workspace->strm.next_in = data_in;
341 			tmp = srclen - workspace->strm.total_in;
342 			workspace->strm.avail_in = min(tmp, PAGE_SIZE);
350 	zlib_inflateEnd(&workspace->strm);
365 	workspace->strm.next_in = data_in;
366 	workspace->strm.avail_in = srclen;
367 	workspace->strm.total_in = 0;
369 	workspace->strm.next_out = workspace->buf;
370 	workspace->strm.avail_out = workspace->buf_size;
371 	workspace->strm.total_out = 0;
379 		workspace->strm.next_in += 2;
380 		workspace->strm.avail_in -= 2;
383 	if (Z_OK != zlib_inflateInit2(&workspace->strm, wbits)) {
392 	ret = zlib_inflate(&workspace->strm, Z_FINISH);
393 	to_copy = min(workspace->strm.total_out, destlen);
408 	zlib_inflateEnd(&workspace->strm);