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;
41 * Read len bytes to buf.
44 * < 0 - negative errno in case of error
45 * > 0 - no data read, EOF
47 static int read_buf(struct btrfs_send_stream *sctx, char *buf, size_t len)
55 rbytes = read(sctx->fd, buf + pos, len - pos);
58 error("read from stream failed: %s",
76 * Reads a single command from kernel space and decodes the TLV's into
81 * < 0 - an error in the command
83 static int read_cmd(struct btrfs_send_stream *sctx)
93 memset(sctx->cmd_attrs, 0, sizeof(sctx->cmd_attrs));
95 ASSERT(sizeof(*sctx->cmd_hdr) <= sizeof(sctx->read_buf));
96 ret = read_buf(sctx, sctx->read_buf, sizeof(*sctx->cmd_hdr));
101 error("unexpected EOF in stream");
105 sctx->cmd_hdr = (struct btrfs_cmd_header *)sctx->read_buf;
106 cmd = le16_to_cpu(sctx->cmd_hdr->cmd);
107 cmd_len = le32_to_cpu(sctx->cmd_hdr->len);
109 if (cmd_len + sizeof(*sctx->cmd_hdr) >= sizeof(sctx->read_buf)) {
111 error("command length %u too big for buffer %zu",
112 cmd_len, sizeof(sctx->read_buf));
116 data = sctx->read_buf + sizeof(*sctx->cmd_hdr);
117 ret = read_buf(sctx, data, cmd_len);
122 error("unexpected EOF in stream");
126 crc = le32_to_cpu(sctx->cmd_hdr->crc);
127 sctx->cmd_hdr->crc = 0;
129 crc2 = crc32c(0, (unsigned char*)sctx->read_buf,
130 sizeof(*sctx->cmd_hdr) + cmd_len);
134 error("crc32 mismatch in command");
139 while (pos < cmd_len) {
140 struct btrfs_tlv_header *tlv_hdr;
144 tlv_hdr = (struct btrfs_tlv_header *)data;
145 tlv_type = le16_to_cpu(tlv_hdr->tlv_type);
146 tlv_len = le16_to_cpu(tlv_hdr->tlv_len);
148 if (tlv_type == 0 || tlv_type > BTRFS_SEND_A_MAX
149 || tlv_len > BTRFS_SEND_BUF_SIZE) {
150 error("invalid tlv in cmd tlv_type = %hu, tlv_len = %hu",
156 sctx->cmd_attrs[tlv_type] = tlv_hdr;
158 data += sizeof(*tlv_hdr) + tlv_len;
159 pos += sizeof(*tlv_hdr) + tlv_len;
169 static int tlv_get(struct btrfs_send_stream *sctx, int attr, void **data, int *len)
172 struct btrfs_tlv_header *hdr;
174 if (attr <= 0 || attr > BTRFS_SEND_A_MAX) {
175 error("invalid attribute requested, attr = %d", attr);
180 hdr = sctx->cmd_attrs[attr];
182 error("attribute %d requested but not present", attr);
187 *len = le16_to_cpu(hdr->tlv_len);
196 #define __TLV_GOTO_FAIL(expr) \
197 if ((ret = expr) < 0) \
200 #define __TLV_DO_WHILE_GOTO_FAIL(expr) \
202 __TLV_GOTO_FAIL(expr) \
206 #define TLV_GET(s, attr, data, len) \
207 __TLV_DO_WHILE_GOTO_FAIL(tlv_get(s, attr, data, len))
209 #define TLV_CHECK_LEN(expected, got) \
211 if (expected != got) { \
212 error("invalid size for attribute, " \
213 "expected = %d, got = %d", \
214 (int)expected, (int)got); \
216 goto tlv_get_failed; \
220 #define TLV_GET_INT(s, attr, bits, v) \
224 TLV_GET(s, attr, (void**)&__tmp, &__len); \
225 TLV_CHECK_LEN(sizeof(*__tmp), __len); \
226 *v = get_unaligned_le##bits(__tmp); \
229 #define TLV_GET_U8(s, attr, v) TLV_GET_INT(s, attr, 8, v)
230 #define TLV_GET_U16(s, attr, v) TLV_GET_INT(s, attr, 16, v)
231 #define TLV_GET_U32(s, attr, v) TLV_GET_INT(s, attr, 32, v)
232 #define TLV_GET_U64(s, attr, v) TLV_GET_INT(s, attr, 64, v)
234 static int tlv_get_string(struct btrfs_send_stream *sctx, int attr, char **str)
240 TLV_GET(sctx, attr, &data, &len);
242 *str = malloc(len + 1);
246 memcpy(*str, data, len);
253 #define TLV_GET_STRING(s, attr, str) \
254 __TLV_DO_WHILE_GOTO_FAIL(tlv_get_string(s, attr, str))
256 static int tlv_get_timespec(struct btrfs_send_stream *sctx,
257 int attr, struct timespec *ts)
261 struct btrfs_timespec *bts;
263 TLV_GET(sctx, attr, (void**)&bts, &len);
264 TLV_CHECK_LEN(sizeof(*bts), len);
266 ts->tv_sec = le64_to_cpu(bts->sec);
267 ts->tv_nsec = le32_to_cpu(bts->nsec);
273 #define TLV_GET_TIMESPEC(s, attr, ts) \
274 __TLV_DO_WHILE_GOTO_FAIL(tlv_get_timespec(s, attr, ts))
276 static int tlv_get_uuid(struct btrfs_send_stream *sctx, int attr, u8 *uuid)
282 TLV_GET(sctx, attr, &data, &len);
283 TLV_CHECK_LEN(BTRFS_UUID_SIZE, len);
284 memcpy(uuid, data, BTRFS_UUID_SIZE);
291 #define TLV_GET_UUID(s, attr, uuid) \
292 __TLV_DO_WHILE_GOTO_FAIL(tlv_get_uuid(s, attr, uuid))
294 static int read_and_process_cmd(struct btrfs_send_stream *sctx)
298 char *path_to = NULL;
299 char *clone_path = NULL;
300 char *xattr_name = NULL;
301 void *xattr_data = NULL;
306 u8 uuid[BTRFS_UUID_SIZE];
307 u8 clone_uuid[BTRFS_UUID_SIZE];
319 ret = read_cmd(sctx);
324 case BTRFS_SEND_C_SUBVOL:
325 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
326 TLV_GET_UUID(sctx, BTRFS_SEND_A_UUID, uuid);
327 TLV_GET_U64(sctx, BTRFS_SEND_A_CTRANSID, &ctransid);
328 ret = sctx->ops->subvol(path, uuid, ctransid, sctx->user);
330 case BTRFS_SEND_C_SNAPSHOT:
331 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
332 TLV_GET_UUID(sctx, BTRFS_SEND_A_UUID, uuid);
333 TLV_GET_U64(sctx, BTRFS_SEND_A_CTRANSID, &ctransid);
334 TLV_GET_UUID(sctx, BTRFS_SEND_A_CLONE_UUID, clone_uuid);
335 TLV_GET_U64(sctx, BTRFS_SEND_A_CLONE_CTRANSID, &clone_ctransid);
336 ret = sctx->ops->snapshot(path, uuid, ctransid, clone_uuid,
337 clone_ctransid, sctx->user);
339 case BTRFS_SEND_C_MKFILE:
340 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
341 ret = sctx->ops->mkfile(path, sctx->user);
343 case BTRFS_SEND_C_MKDIR:
344 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
345 ret = sctx->ops->mkdir(path, sctx->user);
347 case BTRFS_SEND_C_MKNOD:
348 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
349 TLV_GET_U64(sctx, BTRFS_SEND_A_MODE, &mode);
350 TLV_GET_U64(sctx, BTRFS_SEND_A_RDEV, &dev);
351 ret = sctx->ops->mknod(path, mode, dev, sctx->user);
353 case BTRFS_SEND_C_MKFIFO:
354 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
355 ret = sctx->ops->mkfifo(path, sctx->user);
357 case BTRFS_SEND_C_MKSOCK:
358 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
359 ret = sctx->ops->mksock(path, sctx->user);
361 case BTRFS_SEND_C_SYMLINK:
362 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
363 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH_LINK, &path_to);
364 ret = sctx->ops->symlink(path, path_to, sctx->user);
366 case BTRFS_SEND_C_RENAME:
367 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
368 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH_TO, &path_to);
369 ret = sctx->ops->rename(path, path_to, sctx->user);
371 case BTRFS_SEND_C_LINK:
372 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
373 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH_LINK, &path_to);
374 ret = sctx->ops->link(path, path_to, sctx->user);
376 case BTRFS_SEND_C_UNLINK:
377 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
378 ret = sctx->ops->unlink(path, sctx->user);
380 case BTRFS_SEND_C_RMDIR:
381 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
382 ret = sctx->ops->rmdir(path, sctx->user);
384 case BTRFS_SEND_C_WRITE:
385 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
386 TLV_GET_U64(sctx, BTRFS_SEND_A_FILE_OFFSET, &offset);
387 TLV_GET(sctx, BTRFS_SEND_A_DATA, &data, &len);
388 ret = sctx->ops->write(path, data, offset, len, sctx->user);
390 case BTRFS_SEND_C_CLONE:
391 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
392 TLV_GET_U64(sctx, BTRFS_SEND_A_FILE_OFFSET, &offset);
393 TLV_GET_U64(sctx, BTRFS_SEND_A_CLONE_LEN, &len);
394 TLV_GET_UUID(sctx, BTRFS_SEND_A_CLONE_UUID, clone_uuid);
395 TLV_GET_U64(sctx, BTRFS_SEND_A_CLONE_CTRANSID, &clone_ctransid);
396 TLV_GET_STRING(sctx, BTRFS_SEND_A_CLONE_PATH, &clone_path);
397 TLV_GET_U64(sctx, BTRFS_SEND_A_CLONE_OFFSET, &clone_offset);
398 ret = sctx->ops->clone(path, offset, len, clone_uuid,
399 clone_ctransid, clone_path, clone_offset,
402 case BTRFS_SEND_C_SET_XATTR:
403 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
404 TLV_GET_STRING(sctx, BTRFS_SEND_A_XATTR_NAME, &xattr_name);
405 TLV_GET(sctx, BTRFS_SEND_A_XATTR_DATA, &xattr_data, &xattr_len);
406 ret = sctx->ops->set_xattr(path, xattr_name, xattr_data,
407 xattr_len, sctx->user);
409 case BTRFS_SEND_C_REMOVE_XATTR:
410 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
411 TLV_GET_STRING(sctx, BTRFS_SEND_A_XATTR_NAME, &xattr_name);
412 ret = sctx->ops->remove_xattr(path, xattr_name, sctx->user);
414 case BTRFS_SEND_C_TRUNCATE:
415 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
416 TLV_GET_U64(sctx, BTRFS_SEND_A_SIZE, &tmp);
417 ret = sctx->ops->truncate(path, tmp, sctx->user);
419 case BTRFS_SEND_C_CHMOD:
420 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
421 TLV_GET_U64(sctx, BTRFS_SEND_A_MODE, &tmp);
422 ret = sctx->ops->chmod(path, tmp, sctx->user);
424 case BTRFS_SEND_C_CHOWN:
425 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
426 TLV_GET_U64(sctx, BTRFS_SEND_A_UID, &tmp);
427 TLV_GET_U64(sctx, BTRFS_SEND_A_GID, &tmp2);
428 ret = sctx->ops->chown(path, tmp, tmp2, sctx->user);
430 case BTRFS_SEND_C_UTIMES:
431 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
432 TLV_GET_TIMESPEC(sctx, BTRFS_SEND_A_ATIME, &at);
433 TLV_GET_TIMESPEC(sctx, BTRFS_SEND_A_MTIME, &mt);
434 TLV_GET_TIMESPEC(sctx, BTRFS_SEND_A_CTIME, &ct);
435 ret = sctx->ops->utimes(path, &at, &mt, &ct, sctx->user);
437 case BTRFS_SEND_C_UPDATE_EXTENT:
438 TLV_GET_STRING(sctx, BTRFS_SEND_A_PATH, &path);
439 TLV_GET_U64(sctx, BTRFS_SEND_A_FILE_OFFSET, &offset);
440 TLV_GET_U64(sctx, BTRFS_SEND_A_SIZE, &tmp);
441 ret = sctx->ops->update_extent(path, offset, tmp, sctx->user);
443 case BTRFS_SEND_C_END:
458 * If max_errors is 0, then don't stop processing the stream if one of the
459 * callbacks in btrfs_send_ops structure returns an error. If greater than
460 * zero, stop after max_errors errors happened.
462 int btrfs_read_and_process_send_stream(int fd,
463 struct btrfs_send_ops *ops, void *user,
468 struct btrfs_send_stream sctx;
469 struct btrfs_stream_header hdr;
477 ret = read_buf(&sctx, (char*)&hdr, sizeof(hdr));
485 if (strcmp(hdr.magic, BTRFS_SEND_STREAM_MAGIC)) {
487 error("unexpected header");
491 sctx.version = le32_to_cpu(hdr.version);
492 if (sctx.version > BTRFS_SEND_STREAM_VERSION) {
494 error("stream version %d not supported, please use newer version",
500 ret = read_and_process_cmd(&sctx);
504 if (max_errors > 0 && errors >= max_errors)
506 } else if (ret > 0) {
514 if (last_err && !ret)