2 * Copyright (C) 2012 Alexander Block. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
19 #include <uuid/uuid.h>
23 #include "send-stream.h"
27 struct btrfs_send_stream {
29 char read_buf[BTRFS_SEND_BUF_SIZE];
32 struct btrfs_cmd_header *cmd_hdr;
33 struct btrfs_tlv_header *cmd_attrs[BTRFS_SEND_A_MAX + 1];
36 struct btrfs_send_ops *ops;
40 static int read_buf(struct btrfs_send_stream *sctx, char *buf, size_t len)
48 rbytes = read(sctx->fd, buf + pos, len - pos);
51 error("read from stream failed: %s",
69 * Reads a single command from kernel space and decodes the TLV's into
72 static int read_cmd(struct btrfs_send_stream *sctx)
81 struct btrfs_tlv_header *tlv_hdr;
85 memset(sctx->cmd_attrs, 0, sizeof(sctx->cmd_attrs));
87 ASSERT(sizeof(*sctx->cmd_hdr) <= sizeof(sctx->read_buf));
88 ret = read_buf(sctx, sctx->read_buf, sizeof(*sctx->cmd_hdr));
93 error("unexpected EOF in stream");
97 sctx->cmd_hdr = (struct btrfs_cmd_header *)sctx->read_buf;
98 cmd = le16_to_cpu(sctx->cmd_hdr->cmd);
99 cmd_len = le32_to_cpu(sctx->cmd_hdr->len);
101 if (cmd_len + sizeof(*sctx->cmd_hdr) >= sizeof(sctx->read_buf)) {
103 error("command length %u too big for buffer %zu",
104 cmd_len, sizeof(sctx->read_buf));
108 data = sctx->read_buf + sizeof(*sctx->cmd_hdr);
109 ret = read_buf(sctx, data, cmd_len);
114 error("unexpected EOF in stream");
118 crc = le32_to_cpu(sctx->cmd_hdr->crc);
119 sctx->cmd_hdr->crc = 0;
121 crc2 = crc32c(0, (unsigned char*)sctx->read_buf,
122 sizeof(*sctx->cmd_hdr) + cmd_len);
126 error("crc32 mismatch in command");
131 while (pos < cmd_len) {
132 tlv_hdr = (struct btrfs_tlv_header *)data;
133 tlv_type = le16_to_cpu(tlv_hdr->tlv_type);
134 tlv_len = le16_to_cpu(tlv_hdr->tlv_len);
136 if (tlv_type <= 0 || tlv_type > BTRFS_SEND_A_MAX ||
137 tlv_len < 0 || tlv_len > BTRFS_SEND_BUF_SIZE) {
138 error("invalid tlv in cmd tlv_type = %d, tlv_len = %d",
144 sctx->cmd_attrs[tlv_type] = tlv_hdr;
146 data += sizeof(*tlv_hdr) + tlv_len;
147 pos += sizeof(*tlv_hdr) + tlv_len;
157 static int tlv_get(struct btrfs_send_stream *sctx, int attr, void **data, int *len)
160 struct btrfs_tlv_header *h;
162 if (attr <= 0 || attr > BTRFS_SEND_A_MAX) {
163 error("invalid attribute requested, attr = %d", attr);
168 h = sctx->cmd_attrs[attr];
170 error("attribute %d requested but not present", attr);
175 *len = le16_to_cpu(h->tlv_len);
184 #define __TLV_GOTO_FAIL(expr) \
185 if ((ret = expr) < 0) \
188 #define __TLV_DO_WHILE_GOTO_FAIL(expr) \
190 __TLV_GOTO_FAIL(expr) \
194 #define TLV_GET(s, attr, data, len) \
195 __TLV_DO_WHILE_GOTO_FAIL(tlv_get(s, attr, data, len))
197 #define TLV_CHECK_LEN(expected, got) \
199 if (expected != got) { \
200 error("invalid size for attribute, " \
201 "expected = %d, got = %d", \
202 (int)expected, (int)got); \
204 goto tlv_get_failed; \
208 #define TLV_GET_INT(s, attr, bits, v) \
212 TLV_GET(s, attr, (void**)&__tmp, &__len); \
213 TLV_CHECK_LEN(sizeof(*__tmp), __len); \
214 *v = get_unaligned_le##bits(__tmp); \
217 #define TLV_GET_U8(s, attr, v) TLV_GET_INT(s, attr, 8, v)
218 #define TLV_GET_U16(s, attr, v) TLV_GET_INT(s, attr, 16, v)
219 #define TLV_GET_U32(s, attr, v) TLV_GET_INT(s, attr, 32, v)
220 #define TLV_GET_U64(s, attr, v) TLV_GET_INT(s, attr, 64, v)
222 static int tlv_get_string(struct btrfs_send_stream *sctx, int attr, char **str)
228 TLV_GET(sctx, attr, &data, &len);
230 *str = malloc(len + 1);
234 memcpy(*str, data, len);
241 #define TLV_GET_STRING(s, attr, str) \
242 __TLV_DO_WHILE_GOTO_FAIL(tlv_get_string(s, attr, str))
244 static int tlv_get_timespec(struct btrfs_send_stream *sctx,
245 int attr, struct timespec *ts)
249 struct btrfs_timespec *bts;
251 TLV_GET(sctx, attr, (void**)&bts, &len);
252 TLV_CHECK_LEN(sizeof(*bts), len);
254 ts->tv_sec = le64_to_cpu(bts->sec);
255 ts->tv_nsec = le32_to_cpu(bts->nsec);
261 #define TLV_GET_TIMESPEC(s, attr, ts) \
262 __TLV_DO_WHILE_GOTO_FAIL(tlv_get_timespec(s, attr, ts))
264 static int tlv_get_uuid(struct btrfs_send_stream *sctx, int attr, u8 *uuid)
270 TLV_GET(sctx, attr, &data, &len);
271 TLV_CHECK_LEN(BTRFS_UUID_SIZE, len);
272 memcpy(uuid, data, BTRFS_UUID_SIZE);
279 #define TLV_GET_UUID(s, attr, uuid) \
280 __TLV_DO_WHILE_GOTO_FAIL(tlv_get_uuid(s, attr, uuid))
282 static int read_and_process_cmd(struct btrfs_send_stream *sctx)
286 char *path_to = NULL;
287 char *clone_path = NULL;
288 char *xattr_name = NULL;
289 void *xattr_data = NULL;
294 u8 uuid[BTRFS_UUID_SIZE];
295 u8 clone_uuid[BTRFS_UUID_SIZE];
307 ret = read_cmd(sctx);
312 case BTRFS_SEND_C_SUBVOL:
313 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
314 TLV_GET_UUID(sctx, BTRFS_SEND_A_UUID, uuid);
315 TLV_GET_U64(sctx, BTRFS_SEND_A_CTRANSID, &ctransid);
316 ret = sctx->ops->subvol(path, uuid, ctransid, sctx->user);
318 case BTRFS_SEND_C_SNAPSHOT:
319 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
320 TLV_GET_UUID(sctx, BTRFS_SEND_A_UUID, uuid);
321 TLV_GET_U64(sctx, BTRFS_SEND_A_CTRANSID, &ctransid);
322 TLV_GET_UUID(sctx, BTRFS_SEND_A_CLONE_UUID, clone_uuid);
323 TLV_GET_U64(sctx, BTRFS_SEND_A_CLONE_CTRANSID, &clone_ctransid);
324 ret = sctx->ops->snapshot(path, uuid, ctransid, clone_uuid,
325 clone_ctransid, sctx->user);
327 case BTRFS_SEND_C_MKFILE:
328 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
329 ret = sctx->ops->mkfile(path, sctx->user);
331 case BTRFS_SEND_C_MKDIR:
332 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
333 ret = sctx->ops->mkdir(path, sctx->user);
335 case BTRFS_SEND_C_MKNOD:
336 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
337 TLV_GET_U64(sctx, BTRFS_SEND_A_MODE, &mode);
338 TLV_GET_U64(sctx, BTRFS_SEND_A_RDEV, &dev);
339 ret = sctx->ops->mknod(path, mode, dev, sctx->user);
341 case BTRFS_SEND_C_MKFIFO:
342 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
343 ret = sctx->ops->mkfifo(path, sctx->user);
345 case BTRFS_SEND_C_MKSOCK:
346 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
347 ret = sctx->ops->mksock(path, sctx->user);
349 case BTRFS_SEND_C_SYMLINK:
350 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
351 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH_LINK, &path_to);
352 ret = sctx->ops->symlink(path, path_to, sctx->user);
354 case BTRFS_SEND_C_RENAME:
355 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
356 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH_TO, &path_to);
357 ret = sctx->ops->rename(path, path_to, sctx->user);
359 case BTRFS_SEND_C_LINK:
360 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
361 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH_LINK, &path_to);
362 ret = sctx->ops->link(path, path_to, sctx->user);
364 case BTRFS_SEND_C_UNLINK:
365 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
366 ret = sctx->ops->unlink(path, sctx->user);
368 case BTRFS_SEND_C_RMDIR:
369 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
370 ret = sctx->ops->rmdir(path, sctx->user);
372 case BTRFS_SEND_C_WRITE:
373 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
374 TLV_GET_U64(sctx, BTRFS_SEND_A_FILE_OFFSET, &offset);
375 TLV_GET(sctx, BTRFS_SEND_A_DATA, &data, &len);
376 ret = sctx->ops->write(path, data, offset, len, sctx->user);
378 case BTRFS_SEND_C_CLONE:
379 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
380 TLV_GET_U64(sctx, BTRFS_SEND_A_FILE_OFFSET, &offset);
381 TLV_GET_U64(sctx, BTRFS_SEND_A_CLONE_LEN, &len);
382 TLV_GET_UUID(sctx, BTRFS_SEND_A_CLONE_UUID, clone_uuid);
383 TLV_GET_U64(sctx, BTRFS_SEND_A_CLONE_CTRANSID, &clone_ctransid);
384 TLV_GET_STRING(sctx, BTRFS_SEND_A_CLONE_PATH, &clone_path);
385 TLV_GET_U64(sctx, BTRFS_SEND_A_CLONE_OFFSET, &clone_offset);
386 ret = sctx->ops->clone(path, offset, len, clone_uuid,
387 clone_ctransid, clone_path, clone_offset,
390 case BTRFS_SEND_C_SET_XATTR:
391 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
392 TLV_GET_STRING(sctx, BTRFS_SEND_A_XATTR_NAME, &xattr_name);
393 TLV_GET(sctx, BTRFS_SEND_A_XATTR_DATA, &xattr_data, &xattr_len);
394 ret = sctx->ops->set_xattr(path, xattr_name, xattr_data,
395 xattr_len, sctx->user);
397 case BTRFS_SEND_C_REMOVE_XATTR:
398 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
399 TLV_GET_STRING(sctx, BTRFS_SEND_A_XATTR_NAME, &xattr_name);
400 ret = sctx->ops->remove_xattr(path, xattr_name, sctx->user);
402 case BTRFS_SEND_C_TRUNCATE:
403 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
404 TLV_GET_U64(sctx, BTRFS_SEND_A_SIZE, &tmp);
405 ret = sctx->ops->truncate(path, tmp, sctx->user);
407 case BTRFS_SEND_C_CHMOD:
408 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
409 TLV_GET_U64(sctx, BTRFS_SEND_A_MODE, &tmp);
410 ret = sctx->ops->chmod(path, tmp, sctx->user);
412 case BTRFS_SEND_C_CHOWN:
413 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
414 TLV_GET_U64(sctx, BTRFS_SEND_A_UID, &tmp);
415 TLV_GET_U64(sctx, BTRFS_SEND_A_GID, &tmp2);
416 ret = sctx->ops->chown(path, tmp, tmp2, sctx->user);
418 case BTRFS_SEND_C_UTIMES:
419 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
420 TLV_GET_TIMESPEC(sctx, BTRFS_SEND_A_ATIME, &at);
421 TLV_GET_TIMESPEC(sctx, BTRFS_SEND_A_MTIME, &mt);
422 TLV_GET_TIMESPEC(sctx, BTRFS_SEND_A_CTIME, &ct);
423 ret = sctx->ops->utimes(path, &at, &mt, &ct, sctx->user);
425 case BTRFS_SEND_C_UPDATE_EXTENT:
426 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
427 TLV_GET_U64(sctx, BTRFS_SEND_A_FILE_OFFSET, &offset);
428 TLV_GET_U64(sctx, BTRFS_SEND_A_SIZE, &tmp);
429 ret = sctx->ops->update_extent(path, offset, tmp, sctx->user);
431 case BTRFS_SEND_C_END:
446 * If max_errors is 0, then don't stop processing the stream if one of the
447 * callbacks in btrfs_send_ops structure returns an error. If greater than
448 * zero, stop after max_errors errors happened.
450 int btrfs_read_and_process_send_stream(int fd,
451 struct btrfs_send_ops *ops, void *user,
456 struct btrfs_send_stream sctx;
457 struct btrfs_stream_header hdr;
465 ret = read_buf(&sctx, (char*)&hdr, sizeof(hdr));
473 if (strcmp(hdr.magic, BTRFS_SEND_STREAM_MAGIC)) {
475 error("unexpected header");
479 sctx.version = le32_to_cpu(hdr.version);
480 if (sctx.version > BTRFS_SEND_STREAM_VERSION) {
482 error("stream version %d not supported, please use newer version",
488 ret = read_and_process_cmd(&sctx);
492 if (max_errors > 0 && errors >= max_errors)
494 } else if (ret > 0) {
502 if (last_err && !ret)