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31db9f7c AB |
1 | /* |
2 | * Copyright (C) 2012 Alexander Block. All rights reserved. | |
3 | * | |
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. | |
7 | * | |
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. | |
12 | * | |
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. | |
17 | */ | |
18 | ||
19 | #include <linux/bsearch.h> | |
20 | #include <linux/fs.h> | |
21 | #include <linux/file.h> | |
22 | #include <linux/sort.h> | |
23 | #include <linux/mount.h> | |
24 | #include <linux/xattr.h> | |
25 | #include <linux/posix_acl_xattr.h> | |
26 | #include <linux/radix-tree.h> | |
27 | #include <linux/crc32c.h> | |
28 | ||
29 | #include "send.h" | |
30 | #include "backref.h" | |
31 | #include "locking.h" | |
32 | #include "disk-io.h" | |
33 | #include "btrfs_inode.h" | |
34 | #include "transaction.h" | |
35 | ||
36 | static int g_verbose = 0; | |
37 | ||
38 | #define verbose_printk(...) if (g_verbose) printk(__VA_ARGS__) | |
39 | ||
40 | /* | |
41 | * A fs_path is a helper to dynamically build path names with unknown size. | |
42 | * It reallocates the internal buffer on demand. | |
43 | * It allows fast adding of path elements on the right side (normal path) and | |
44 | * fast adding to the left side (reversed path). A reversed path can also be | |
45 | * unreversed if needed. | |
46 | */ | |
47 | struct fs_path { | |
48 | union { | |
49 | struct { | |
50 | char *start; | |
51 | char *end; | |
52 | char *prepared; | |
53 | ||
54 | char *buf; | |
55 | int buf_len; | |
56 | int reversed:1; | |
57 | int virtual_mem:1; | |
58 | char inline_buf[]; | |
59 | }; | |
60 | char pad[PAGE_SIZE]; | |
61 | }; | |
62 | }; | |
63 | #define FS_PATH_INLINE_SIZE \ | |
64 | (sizeof(struct fs_path) - offsetof(struct fs_path, inline_buf)) | |
65 | ||
66 | ||
67 | /* reused for each extent */ | |
68 | struct clone_root { | |
69 | struct btrfs_root *root; | |
70 | u64 ino; | |
71 | u64 offset; | |
72 | ||
73 | u64 found_refs; | |
74 | }; | |
75 | ||
76 | #define SEND_CTX_MAX_NAME_CACHE_SIZE 128 | |
77 | #define SEND_CTX_NAME_CACHE_CLEAN_SIZE (SEND_CTX_MAX_NAME_CACHE_SIZE * 2) | |
78 | ||
79 | struct send_ctx { | |
80 | struct file *send_filp; | |
81 | loff_t send_off; | |
82 | char *send_buf; | |
83 | u32 send_size; | |
84 | u32 send_max_size; | |
85 | u64 total_send_size; | |
86 | u64 cmd_send_size[BTRFS_SEND_C_MAX + 1]; | |
87 | ||
88 | struct vfsmount *mnt; | |
89 | ||
90 | struct btrfs_root *send_root; | |
91 | struct btrfs_root *parent_root; | |
92 | struct clone_root *clone_roots; | |
93 | int clone_roots_cnt; | |
94 | ||
95 | /* current state of the compare_tree call */ | |
96 | struct btrfs_path *left_path; | |
97 | struct btrfs_path *right_path; | |
98 | struct btrfs_key *cmp_key; | |
99 | ||
100 | /* | |
101 | * infos of the currently processed inode. In case of deleted inodes, | |
102 | * these are the values from the deleted inode. | |
103 | */ | |
104 | u64 cur_ino; | |
105 | u64 cur_inode_gen; | |
106 | int cur_inode_new; | |
107 | int cur_inode_new_gen; | |
108 | int cur_inode_deleted; | |
109 | int cur_inode_first_ref_orphan; | |
110 | u64 cur_inode_size; | |
111 | u64 cur_inode_mode; | |
112 | ||
113 | u64 send_progress; | |
114 | ||
115 | struct list_head new_refs; | |
116 | struct list_head deleted_refs; | |
117 | ||
118 | struct radix_tree_root name_cache; | |
119 | struct list_head name_cache_list; | |
120 | int name_cache_size; | |
121 | ||
122 | struct file *cur_inode_filp; | |
123 | char *read_buf; | |
124 | }; | |
125 | ||
126 | struct name_cache_entry { | |
127 | struct list_head list; | |
128 | struct list_head use_list; | |
129 | u64 ino; | |
130 | u64 gen; | |
131 | u64 parent_ino; | |
132 | u64 parent_gen; | |
133 | int ret; | |
134 | int need_later_update; | |
135 | int name_len; | |
136 | char name[]; | |
137 | }; | |
138 | ||
139 | static void fs_path_reset(struct fs_path *p) | |
140 | { | |
141 | if (p->reversed) { | |
142 | p->start = p->buf + p->buf_len - 1; | |
143 | p->end = p->start; | |
144 | *p->start = 0; | |
145 | } else { | |
146 | p->start = p->buf; | |
147 | p->end = p->start; | |
148 | *p->start = 0; | |
149 | } | |
150 | } | |
151 | ||
152 | static struct fs_path *fs_path_alloc(struct send_ctx *sctx) | |
153 | { | |
154 | struct fs_path *p; | |
155 | ||
156 | p = kmalloc(sizeof(*p), GFP_NOFS); | |
157 | if (!p) | |
158 | return NULL; | |
159 | p->reversed = 0; | |
160 | p->virtual_mem = 0; | |
161 | p->buf = p->inline_buf; | |
162 | p->buf_len = FS_PATH_INLINE_SIZE; | |
163 | fs_path_reset(p); | |
164 | return p; | |
165 | } | |
166 | ||
167 | static struct fs_path *fs_path_alloc_reversed(struct send_ctx *sctx) | |
168 | { | |
169 | struct fs_path *p; | |
170 | ||
171 | p = fs_path_alloc(sctx); | |
172 | if (!p) | |
173 | return NULL; | |
174 | p->reversed = 1; | |
175 | fs_path_reset(p); | |
176 | return p; | |
177 | } | |
178 | ||
179 | static void fs_path_free(struct send_ctx *sctx, struct fs_path *p) | |
180 | { | |
181 | if (!p) | |
182 | return; | |
183 | if (p->buf != p->inline_buf) { | |
184 | if (p->virtual_mem) | |
185 | vfree(p->buf); | |
186 | else | |
187 | kfree(p->buf); | |
188 | } | |
189 | kfree(p); | |
190 | } | |
191 | ||
192 | static int fs_path_len(struct fs_path *p) | |
193 | { | |
194 | return p->end - p->start; | |
195 | } | |
196 | ||
197 | static int fs_path_ensure_buf(struct fs_path *p, int len) | |
198 | { | |
199 | char *tmp_buf; | |
200 | int path_len; | |
201 | int old_buf_len; | |
202 | ||
203 | len++; | |
204 | ||
205 | if (p->buf_len >= len) | |
206 | return 0; | |
207 | ||
208 | path_len = p->end - p->start; | |
209 | old_buf_len = p->buf_len; | |
210 | len = PAGE_ALIGN(len); | |
211 | ||
212 | if (p->buf == p->inline_buf) { | |
213 | tmp_buf = kmalloc(len, GFP_NOFS); | |
214 | if (!tmp_buf) { | |
215 | tmp_buf = vmalloc(len); | |
216 | if (!tmp_buf) | |
217 | return -ENOMEM; | |
218 | p->virtual_mem = 1; | |
219 | } | |
220 | memcpy(tmp_buf, p->buf, p->buf_len); | |
221 | p->buf = tmp_buf; | |
222 | p->buf_len = len; | |
223 | } else { | |
224 | if (p->virtual_mem) { | |
225 | tmp_buf = vmalloc(len); | |
226 | if (!tmp_buf) | |
227 | return -ENOMEM; | |
228 | memcpy(tmp_buf, p->buf, p->buf_len); | |
229 | vfree(p->buf); | |
230 | } else { | |
231 | tmp_buf = krealloc(p->buf, len, GFP_NOFS); | |
232 | if (!tmp_buf) { | |
233 | tmp_buf = vmalloc(len); | |
234 | if (!tmp_buf) | |
235 | return -ENOMEM; | |
236 | memcpy(tmp_buf, p->buf, p->buf_len); | |
237 | kfree(p->buf); | |
238 | p->virtual_mem = 1; | |
239 | } | |
240 | } | |
241 | p->buf = tmp_buf; | |
242 | p->buf_len = len; | |
243 | } | |
244 | if (p->reversed) { | |
245 | tmp_buf = p->buf + old_buf_len - path_len - 1; | |
246 | p->end = p->buf + p->buf_len - 1; | |
247 | p->start = p->end - path_len; | |
248 | memmove(p->start, tmp_buf, path_len + 1); | |
249 | } else { | |
250 | p->start = p->buf; | |
251 | p->end = p->start + path_len; | |
252 | } | |
253 | return 0; | |
254 | } | |
255 | ||
256 | static int fs_path_prepare_for_add(struct fs_path *p, int name_len) | |
257 | { | |
258 | int ret; | |
259 | int new_len; | |
260 | ||
261 | new_len = p->end - p->start + name_len; | |
262 | if (p->start != p->end) | |
263 | new_len++; | |
264 | ret = fs_path_ensure_buf(p, new_len); | |
265 | if (ret < 0) | |
266 | goto out; | |
267 | ||
268 | if (p->reversed) { | |
269 | if (p->start != p->end) | |
270 | *--p->start = '/'; | |
271 | p->start -= name_len; | |
272 | p->prepared = p->start; | |
273 | } else { | |
274 | if (p->start != p->end) | |
275 | *p->end++ = '/'; | |
276 | p->prepared = p->end; | |
277 | p->end += name_len; | |
278 | *p->end = 0; | |
279 | } | |
280 | ||
281 | out: | |
282 | return ret; | |
283 | } | |
284 | ||
285 | static int fs_path_add(struct fs_path *p, const char *name, int name_len) | |
286 | { | |
287 | int ret; | |
288 | ||
289 | ret = fs_path_prepare_for_add(p, name_len); | |
290 | if (ret < 0) | |
291 | goto out; | |
292 | memcpy(p->prepared, name, name_len); | |
293 | p->prepared = NULL; | |
294 | ||
295 | out: | |
296 | return ret; | |
297 | } | |
298 | ||
299 | static int fs_path_add_path(struct fs_path *p, struct fs_path *p2) | |
300 | { | |
301 | int ret; | |
302 | ||
303 | ret = fs_path_prepare_for_add(p, p2->end - p2->start); | |
304 | if (ret < 0) | |
305 | goto out; | |
306 | memcpy(p->prepared, p2->start, p2->end - p2->start); | |
307 | p->prepared = NULL; | |
308 | ||
309 | out: | |
310 | return ret; | |
311 | } | |
312 | ||
313 | static int fs_path_add_from_extent_buffer(struct fs_path *p, | |
314 | struct extent_buffer *eb, | |
315 | unsigned long off, int len) | |
316 | { | |
317 | int ret; | |
318 | ||
319 | ret = fs_path_prepare_for_add(p, len); | |
320 | if (ret < 0) | |
321 | goto out; | |
322 | ||
323 | read_extent_buffer(eb, p->prepared, off, len); | |
324 | p->prepared = NULL; | |
325 | ||
326 | out: | |
327 | return ret; | |
328 | } | |
329 | ||
330 | static void fs_path_remove(struct fs_path *p) | |
331 | { | |
332 | BUG_ON(p->reversed); | |
333 | while (p->start != p->end && *p->end != '/') | |
334 | p->end--; | |
335 | *p->end = 0; | |
336 | } | |
337 | ||
338 | static int fs_path_copy(struct fs_path *p, struct fs_path *from) | |
339 | { | |
340 | int ret; | |
341 | ||
342 | p->reversed = from->reversed; | |
343 | fs_path_reset(p); | |
344 | ||
345 | ret = fs_path_add_path(p, from); | |
346 | ||
347 | return ret; | |
348 | } | |
349 | ||
350 | ||
351 | static void fs_path_unreverse(struct fs_path *p) | |
352 | { | |
353 | char *tmp; | |
354 | int len; | |
355 | ||
356 | if (!p->reversed) | |
357 | return; | |
358 | ||
359 | tmp = p->start; | |
360 | len = p->end - p->start; | |
361 | p->start = p->buf; | |
362 | p->end = p->start + len; | |
363 | memmove(p->start, tmp, len + 1); | |
364 | p->reversed = 0; | |
365 | } | |
366 | ||
367 | static struct btrfs_path *alloc_path_for_send(void) | |
368 | { | |
369 | struct btrfs_path *path; | |
370 | ||
371 | path = btrfs_alloc_path(); | |
372 | if (!path) | |
373 | return NULL; | |
374 | path->search_commit_root = 1; | |
375 | path->skip_locking = 1; | |
376 | return path; | |
377 | } | |
378 | ||
379 | static int write_buf(struct send_ctx *sctx, const void *buf, u32 len) | |
380 | { | |
381 | int ret; | |
382 | mm_segment_t old_fs; | |
383 | u32 pos = 0; | |
384 | ||
385 | old_fs = get_fs(); | |
386 | set_fs(KERNEL_DS); | |
387 | ||
388 | while (pos < len) { | |
389 | ret = vfs_write(sctx->send_filp, (char *)buf + pos, len - pos, | |
390 | &sctx->send_off); | |
391 | /* TODO handle that correctly */ | |
392 | /*if (ret == -ERESTARTSYS) { | |
393 | continue; | |
394 | }*/ | |
395 | if (ret < 0) | |
396 | goto out; | |
397 | if (ret == 0) { | |
398 | ret = -EIO; | |
399 | goto out; | |
400 | } | |
401 | pos += ret; | |
402 | } | |
403 | ||
404 | ret = 0; | |
405 | ||
406 | out: | |
407 | set_fs(old_fs); | |
408 | return ret; | |
409 | } | |
410 | ||
411 | static int tlv_put(struct send_ctx *sctx, u16 attr, const void *data, int len) | |
412 | { | |
413 | struct btrfs_tlv_header *hdr; | |
414 | int total_len = sizeof(*hdr) + len; | |
415 | int left = sctx->send_max_size - sctx->send_size; | |
416 | ||
417 | if (unlikely(left < total_len)) | |
418 | return -EOVERFLOW; | |
419 | ||
420 | hdr = (struct btrfs_tlv_header *) (sctx->send_buf + sctx->send_size); | |
421 | hdr->tlv_type = cpu_to_le16(attr); | |
422 | hdr->tlv_len = cpu_to_le16(len); | |
423 | memcpy(hdr + 1, data, len); | |
424 | sctx->send_size += total_len; | |
425 | ||
426 | return 0; | |
427 | } | |
428 | ||
429 | #if 0 | |
430 | static int tlv_put_u8(struct send_ctx *sctx, u16 attr, u8 value) | |
431 | { | |
432 | return tlv_put(sctx, attr, &value, sizeof(value)); | |
433 | } | |
434 | ||
435 | static int tlv_put_u16(struct send_ctx *sctx, u16 attr, u16 value) | |
436 | { | |
437 | __le16 tmp = cpu_to_le16(value); | |
438 | return tlv_put(sctx, attr, &tmp, sizeof(tmp)); | |
439 | } | |
440 | ||
441 | static int tlv_put_u32(struct send_ctx *sctx, u16 attr, u32 value) | |
442 | { | |
443 | __le32 tmp = cpu_to_le32(value); | |
444 | return tlv_put(sctx, attr, &tmp, sizeof(tmp)); | |
445 | } | |
446 | #endif | |
447 | ||
448 | static int tlv_put_u64(struct send_ctx *sctx, u16 attr, u64 value) | |
449 | { | |
450 | __le64 tmp = cpu_to_le64(value); | |
451 | return tlv_put(sctx, attr, &tmp, sizeof(tmp)); | |
452 | } | |
453 | ||
454 | static int tlv_put_string(struct send_ctx *sctx, u16 attr, | |
455 | const char *str, int len) | |
456 | { | |
457 | if (len == -1) | |
458 | len = strlen(str); | |
459 | return tlv_put(sctx, attr, str, len); | |
460 | } | |
461 | ||
462 | static int tlv_put_uuid(struct send_ctx *sctx, u16 attr, | |
463 | const u8 *uuid) | |
464 | { | |
465 | return tlv_put(sctx, attr, uuid, BTRFS_UUID_SIZE); | |
466 | } | |
467 | ||
468 | #if 0 | |
469 | static int tlv_put_timespec(struct send_ctx *sctx, u16 attr, | |
470 | struct timespec *ts) | |
471 | { | |
472 | struct btrfs_timespec bts; | |
473 | bts.sec = cpu_to_le64(ts->tv_sec); | |
474 | bts.nsec = cpu_to_le32(ts->tv_nsec); | |
475 | return tlv_put(sctx, attr, &bts, sizeof(bts)); | |
476 | } | |
477 | #endif | |
478 | ||
479 | static int tlv_put_btrfs_timespec(struct send_ctx *sctx, u16 attr, | |
480 | struct extent_buffer *eb, | |
481 | struct btrfs_timespec *ts) | |
482 | { | |
483 | struct btrfs_timespec bts; | |
484 | read_extent_buffer(eb, &bts, (unsigned long)ts, sizeof(bts)); | |
485 | return tlv_put(sctx, attr, &bts, sizeof(bts)); | |
486 | } | |
487 | ||
488 | ||
489 | #define TLV_PUT(sctx, attrtype, attrlen, data) \ | |
490 | do { \ | |
491 | ret = tlv_put(sctx, attrtype, attrlen, data); \ | |
492 | if (ret < 0) \ | |
493 | goto tlv_put_failure; \ | |
494 | } while (0) | |
495 | ||
496 | #define TLV_PUT_INT(sctx, attrtype, bits, value) \ | |
497 | do { \ | |
498 | ret = tlv_put_u##bits(sctx, attrtype, value); \ | |
499 | if (ret < 0) \ | |
500 | goto tlv_put_failure; \ | |
501 | } while (0) | |
502 | ||
503 | #define TLV_PUT_U8(sctx, attrtype, data) TLV_PUT_INT(sctx, attrtype, 8, data) | |
504 | #define TLV_PUT_U16(sctx, attrtype, data) TLV_PUT_INT(sctx, attrtype, 16, data) | |
505 | #define TLV_PUT_U32(sctx, attrtype, data) TLV_PUT_INT(sctx, attrtype, 32, data) | |
506 | #define TLV_PUT_U64(sctx, attrtype, data) TLV_PUT_INT(sctx, attrtype, 64, data) | |
507 | #define TLV_PUT_STRING(sctx, attrtype, str, len) \ | |
508 | do { \ | |
509 | ret = tlv_put_string(sctx, attrtype, str, len); \ | |
510 | if (ret < 0) \ | |
511 | goto tlv_put_failure; \ | |
512 | } while (0) | |
513 | #define TLV_PUT_PATH(sctx, attrtype, p) \ | |
514 | do { \ | |
515 | ret = tlv_put_string(sctx, attrtype, p->start, \ | |
516 | p->end - p->start); \ | |
517 | if (ret < 0) \ | |
518 | goto tlv_put_failure; \ | |
519 | } while(0) | |
520 | #define TLV_PUT_UUID(sctx, attrtype, uuid) \ | |
521 | do { \ | |
522 | ret = tlv_put_uuid(sctx, attrtype, uuid); \ | |
523 | if (ret < 0) \ | |
524 | goto tlv_put_failure; \ | |
525 | } while (0) | |
526 | #define TLV_PUT_TIMESPEC(sctx, attrtype, ts) \ | |
527 | do { \ | |
528 | ret = tlv_put_timespec(sctx, attrtype, ts); \ | |
529 | if (ret < 0) \ | |
530 | goto tlv_put_failure; \ | |
531 | } while (0) | |
532 | #define TLV_PUT_BTRFS_TIMESPEC(sctx, attrtype, eb, ts) \ | |
533 | do { \ | |
534 | ret = tlv_put_btrfs_timespec(sctx, attrtype, eb, ts); \ | |
535 | if (ret < 0) \ | |
536 | goto tlv_put_failure; \ | |
537 | } while (0) | |
538 | ||
539 | static int send_header(struct send_ctx *sctx) | |
540 | { | |
541 | struct btrfs_stream_header hdr; | |
542 | ||
543 | strcpy(hdr.magic, BTRFS_SEND_STREAM_MAGIC); | |
544 | hdr.version = cpu_to_le32(BTRFS_SEND_STREAM_VERSION); | |
545 | ||
546 | return write_buf(sctx, &hdr, sizeof(hdr)); | |
547 | } | |
548 | ||
549 | /* | |
550 | * For each command/item we want to send to userspace, we call this function. | |
551 | */ | |
552 | static int begin_cmd(struct send_ctx *sctx, int cmd) | |
553 | { | |
554 | struct btrfs_cmd_header *hdr; | |
555 | ||
556 | if (!sctx->send_buf) { | |
557 | WARN_ON(1); | |
558 | return -EINVAL; | |
559 | } | |
560 | ||
561 | BUG_ON(sctx->send_size); | |
562 | ||
563 | sctx->send_size += sizeof(*hdr); | |
564 | hdr = (struct btrfs_cmd_header *)sctx->send_buf; | |
565 | hdr->cmd = cpu_to_le16(cmd); | |
566 | ||
567 | return 0; | |
568 | } | |
569 | ||
570 | static int send_cmd(struct send_ctx *sctx) | |
571 | { | |
572 | int ret; | |
573 | struct btrfs_cmd_header *hdr; | |
574 | u32 crc; | |
575 | ||
576 | hdr = (struct btrfs_cmd_header *)sctx->send_buf; | |
577 | hdr->len = cpu_to_le32(sctx->send_size - sizeof(*hdr)); | |
578 | hdr->crc = 0; | |
579 | ||
580 | crc = crc32c(0, (unsigned char *)sctx->send_buf, sctx->send_size); | |
581 | hdr->crc = cpu_to_le32(crc); | |
582 | ||
583 | ret = write_buf(sctx, sctx->send_buf, sctx->send_size); | |
584 | ||
585 | sctx->total_send_size += sctx->send_size; | |
586 | sctx->cmd_send_size[le16_to_cpu(hdr->cmd)] += sctx->send_size; | |
587 | sctx->send_size = 0; | |
588 | ||
589 | return ret; | |
590 | } | |
591 | ||
592 | /* | |
593 | * Sends a move instruction to user space | |
594 | */ | |
595 | static int send_rename(struct send_ctx *sctx, | |
596 | struct fs_path *from, struct fs_path *to) | |
597 | { | |
598 | int ret; | |
599 | ||
600 | verbose_printk("btrfs: send_rename %s -> %s\n", from->start, to->start); | |
601 | ||
602 | ret = begin_cmd(sctx, BTRFS_SEND_C_RENAME); | |
603 | if (ret < 0) | |
604 | goto out; | |
605 | ||
606 | TLV_PUT_PATH(sctx, BTRFS_SEND_A_PATH, from); | |
607 | TLV_PUT_PATH(sctx, BTRFS_SEND_A_PATH_TO, to); | |
608 | ||
609 | ret = send_cmd(sctx); | |
610 | ||
611 | tlv_put_failure: | |
612 | out: | |
613 | return ret; | |
614 | } | |
615 | ||
616 | /* | |
617 | * Sends a link instruction to user space | |
618 | */ | |
619 | static int send_link(struct send_ctx *sctx, | |
620 | struct fs_path *path, struct fs_path *lnk) | |
621 | { | |
622 | int ret; | |
623 | ||
624 | verbose_printk("btrfs: send_link %s -> %s\n", path->start, lnk->start); | |
625 | ||
626 | ret = begin_cmd(sctx, BTRFS_SEND_C_LINK); | |
627 | if (ret < 0) | |
628 | goto out; | |
629 | ||
630 | TLV_PUT_PATH(sctx, BTRFS_SEND_A_PATH, path); | |
631 | TLV_PUT_PATH(sctx, BTRFS_SEND_A_PATH_LINK, lnk); | |
632 | ||
633 | ret = send_cmd(sctx); | |
634 | ||
635 | tlv_put_failure: | |
636 | out: | |
637 | return ret; | |
638 | } | |
639 | ||
640 | /* | |
641 | * Sends an unlink instruction to user space | |
642 | */ | |
643 | static int send_unlink(struct send_ctx *sctx, struct fs_path *path) | |
644 | { | |
645 | int ret; | |
646 | ||
647 | verbose_printk("btrfs: send_unlink %s\n", path->start); | |
648 | ||
649 | ret = begin_cmd(sctx, BTRFS_SEND_C_UNLINK); | |
650 | if (ret < 0) | |
651 | goto out; | |
652 | ||
653 | TLV_PUT_PATH(sctx, BTRFS_SEND_A_PATH, path); | |
654 | ||
655 | ret = send_cmd(sctx); | |
656 | ||
657 | tlv_put_failure: | |
658 | out: | |
659 | return ret; | |
660 | } | |
661 | ||
662 | /* | |
663 | * Sends a rmdir instruction to user space | |
664 | */ | |
665 | static int send_rmdir(struct send_ctx *sctx, struct fs_path *path) | |
666 | { | |
667 | int ret; | |
668 | ||
669 | verbose_printk("btrfs: send_rmdir %s\n", path->start); | |
670 | ||
671 | ret = begin_cmd(sctx, BTRFS_SEND_C_RMDIR); | |
672 | if (ret < 0) | |
673 | goto out; | |
674 | ||
675 | TLV_PUT_PATH(sctx, BTRFS_SEND_A_PATH, path); | |
676 | ||
677 | ret = send_cmd(sctx); | |
678 | ||
679 | tlv_put_failure: | |
680 | out: | |
681 | return ret; | |
682 | } | |
683 | ||
684 | /* | |
685 | * Helper function to retrieve some fields from an inode item. | |
686 | */ | |
687 | static int get_inode_info(struct btrfs_root *root, | |
688 | u64 ino, u64 *size, u64 *gen, | |
689 | u64 *mode, u64 *uid, u64 *gid) | |
690 | { | |
691 | int ret; | |
692 | struct btrfs_inode_item *ii; | |
693 | struct btrfs_key key; | |
694 | struct btrfs_path *path; | |
695 | ||
696 | path = alloc_path_for_send(); | |
697 | if (!path) | |
698 | return -ENOMEM; | |
699 | ||
700 | key.objectid = ino; | |
701 | key.type = BTRFS_INODE_ITEM_KEY; | |
702 | key.offset = 0; | |
703 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
704 | if (ret < 0) | |
705 | goto out; | |
706 | if (ret) { | |
707 | ret = -ENOENT; | |
708 | goto out; | |
709 | } | |
710 | ||
711 | ii = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
712 | struct btrfs_inode_item); | |
713 | if (size) | |
714 | *size = btrfs_inode_size(path->nodes[0], ii); | |
715 | if (gen) | |
716 | *gen = btrfs_inode_generation(path->nodes[0], ii); | |
717 | if (mode) | |
718 | *mode = btrfs_inode_mode(path->nodes[0], ii); | |
719 | if (uid) | |
720 | *uid = btrfs_inode_uid(path->nodes[0], ii); | |
721 | if (gid) | |
722 | *gid = btrfs_inode_gid(path->nodes[0], ii); | |
723 | ||
724 | out: | |
725 | btrfs_free_path(path); | |
726 | return ret; | |
727 | } | |
728 | ||
729 | typedef int (*iterate_inode_ref_t)(int num, u64 dir, int index, | |
730 | struct fs_path *p, | |
731 | void *ctx); | |
732 | ||
733 | /* | |
734 | * Helper function to iterate the entries in ONE btrfs_inode_ref. | |
735 | * The iterate callback may return a non zero value to stop iteration. This can | |
736 | * be a negative value for error codes or 1 to simply stop it. | |
737 | * | |
738 | * path must point to the INODE_REF when called. | |
739 | */ | |
740 | static int iterate_inode_ref(struct send_ctx *sctx, | |
741 | struct btrfs_root *root, struct btrfs_path *path, | |
742 | struct btrfs_key *found_key, int resolve, | |
743 | iterate_inode_ref_t iterate, void *ctx) | |
744 | { | |
745 | struct extent_buffer *eb; | |
746 | struct btrfs_item *item; | |
747 | struct btrfs_inode_ref *iref; | |
748 | struct btrfs_path *tmp_path; | |
749 | struct fs_path *p; | |
750 | u32 cur; | |
751 | u32 len; | |
752 | u32 total; | |
753 | int slot; | |
754 | u32 name_len; | |
755 | char *start; | |
756 | int ret = 0; | |
757 | int num; | |
758 | int index; | |
759 | ||
760 | p = fs_path_alloc_reversed(sctx); | |
761 | if (!p) | |
762 | return -ENOMEM; | |
763 | ||
764 | tmp_path = alloc_path_for_send(); | |
765 | if (!tmp_path) { | |
766 | fs_path_free(sctx, p); | |
767 | return -ENOMEM; | |
768 | } | |
769 | ||
770 | eb = path->nodes[0]; | |
771 | slot = path->slots[0]; | |
772 | item = btrfs_item_nr(eb, slot); | |
773 | iref = btrfs_item_ptr(eb, slot, struct btrfs_inode_ref); | |
774 | cur = 0; | |
775 | len = 0; | |
776 | total = btrfs_item_size(eb, item); | |
777 | ||
778 | num = 0; | |
779 | while (cur < total) { | |
780 | fs_path_reset(p); | |
781 | ||
782 | name_len = btrfs_inode_ref_name_len(eb, iref); | |
783 | index = btrfs_inode_ref_index(eb, iref); | |
784 | if (resolve) { | |
785 | start = btrfs_iref_to_path(root, tmp_path, iref, eb, | |
786 | found_key->offset, p->buf, | |
787 | p->buf_len); | |
788 | if (IS_ERR(start)) { | |
789 | ret = PTR_ERR(start); | |
790 | goto out; | |
791 | } | |
792 | if (start < p->buf) { | |
793 | /* overflow , try again with larger buffer */ | |
794 | ret = fs_path_ensure_buf(p, | |
795 | p->buf_len + p->buf - start); | |
796 | if (ret < 0) | |
797 | goto out; | |
798 | start = btrfs_iref_to_path(root, tmp_path, iref, | |
799 | eb, found_key->offset, p->buf, | |
800 | p->buf_len); | |
801 | if (IS_ERR(start)) { | |
802 | ret = PTR_ERR(start); | |
803 | goto out; | |
804 | } | |
805 | BUG_ON(start < p->buf); | |
806 | } | |
807 | p->start = start; | |
808 | } else { | |
809 | ret = fs_path_add_from_extent_buffer(p, eb, | |
810 | (unsigned long)(iref + 1), name_len); | |
811 | if (ret < 0) | |
812 | goto out; | |
813 | } | |
814 | ||
815 | ||
816 | len = sizeof(*iref) + name_len; | |
817 | iref = (struct btrfs_inode_ref *)((char *)iref + len); | |
818 | cur += len; | |
819 | ||
820 | ret = iterate(num, found_key->offset, index, p, ctx); | |
821 | if (ret) | |
822 | goto out; | |
823 | ||
824 | num++; | |
825 | } | |
826 | ||
827 | out: | |
828 | btrfs_free_path(tmp_path); | |
829 | fs_path_free(sctx, p); | |
830 | return ret; | |
831 | } | |
832 | ||
833 | typedef int (*iterate_dir_item_t)(int num, struct btrfs_key *di_key, | |
834 | const char *name, int name_len, | |
835 | const char *data, int data_len, | |
836 | u8 type, void *ctx); | |
837 | ||
838 | /* | |
839 | * Helper function to iterate the entries in ONE btrfs_dir_item. | |
840 | * The iterate callback may return a non zero value to stop iteration. This can | |
841 | * be a negative value for error codes or 1 to simply stop it. | |
842 | * | |
843 | * path must point to the dir item when called. | |
844 | */ | |
845 | static int iterate_dir_item(struct send_ctx *sctx, | |
846 | struct btrfs_root *root, struct btrfs_path *path, | |
847 | struct btrfs_key *found_key, | |
848 | iterate_dir_item_t iterate, void *ctx) | |
849 | { | |
850 | int ret = 0; | |
851 | struct extent_buffer *eb; | |
852 | struct btrfs_item *item; | |
853 | struct btrfs_dir_item *di; | |
854 | struct btrfs_path *tmp_path = NULL; | |
855 | struct btrfs_key di_key; | |
856 | char *buf = NULL; | |
857 | char *buf2 = NULL; | |
858 | int buf_len; | |
859 | int buf_virtual = 0; | |
860 | u32 name_len; | |
861 | u32 data_len; | |
862 | u32 cur; | |
863 | u32 len; | |
864 | u32 total; | |
865 | int slot; | |
866 | int num; | |
867 | u8 type; | |
868 | ||
869 | buf_len = PAGE_SIZE; | |
870 | buf = kmalloc(buf_len, GFP_NOFS); | |
871 | if (!buf) { | |
872 | ret = -ENOMEM; | |
873 | goto out; | |
874 | } | |
875 | ||
876 | tmp_path = alloc_path_for_send(); | |
877 | if (!tmp_path) { | |
878 | ret = -ENOMEM; | |
879 | goto out; | |
880 | } | |
881 | ||
882 | eb = path->nodes[0]; | |
883 | slot = path->slots[0]; | |
884 | item = btrfs_item_nr(eb, slot); | |
885 | di = btrfs_item_ptr(eb, slot, struct btrfs_dir_item); | |
886 | cur = 0; | |
887 | len = 0; | |
888 | total = btrfs_item_size(eb, item); | |
889 | ||
890 | num = 0; | |
891 | while (cur < total) { | |
892 | name_len = btrfs_dir_name_len(eb, di); | |
893 | data_len = btrfs_dir_data_len(eb, di); | |
894 | type = btrfs_dir_type(eb, di); | |
895 | btrfs_dir_item_key_to_cpu(eb, di, &di_key); | |
896 | ||
897 | if (name_len + data_len > buf_len) { | |
898 | buf_len = PAGE_ALIGN(name_len + data_len); | |
899 | if (buf_virtual) { | |
900 | buf2 = vmalloc(buf_len); | |
901 | if (!buf2) { | |
902 | ret = -ENOMEM; | |
903 | goto out; | |
904 | } | |
905 | vfree(buf); | |
906 | } else { | |
907 | buf2 = krealloc(buf, buf_len, GFP_NOFS); | |
908 | if (!buf2) { | |
909 | buf2 = vmalloc(buf_len); | |
910 | if (!buf2) { | |
911 | ret = -ENOMEM; | |
912 | goto out; | |
913 | } | |
914 | kfree(buf); | |
915 | buf_virtual = 1; | |
916 | } | |
917 | } | |
918 | ||
919 | buf = buf2; | |
920 | buf2 = NULL; | |
921 | } | |
922 | ||
923 | read_extent_buffer(eb, buf, (unsigned long)(di + 1), | |
924 | name_len + data_len); | |
925 | ||
926 | len = sizeof(*di) + name_len + data_len; | |
927 | di = (struct btrfs_dir_item *)((char *)di + len); | |
928 | cur += len; | |
929 | ||
930 | ret = iterate(num, &di_key, buf, name_len, buf + name_len, | |
931 | data_len, type, ctx); | |
932 | if (ret < 0) | |
933 | goto out; | |
934 | if (ret) { | |
935 | ret = 0; | |
936 | goto out; | |
937 | } | |
938 | ||
939 | num++; | |
940 | } | |
941 | ||
942 | out: | |
943 | btrfs_free_path(tmp_path); | |
944 | if (buf_virtual) | |
945 | vfree(buf); | |
946 | else | |
947 | kfree(buf); | |
948 | return ret; | |
949 | } | |
950 | ||
951 | static int __copy_first_ref(int num, u64 dir, int index, | |
952 | struct fs_path *p, void *ctx) | |
953 | { | |
954 | int ret; | |
955 | struct fs_path *pt = ctx; | |
956 | ||
957 | ret = fs_path_copy(pt, p); | |
958 | if (ret < 0) | |
959 | return ret; | |
960 | ||
961 | /* we want the first only */ | |
962 | return 1; | |
963 | } | |
964 | ||
965 | /* | |
966 | * Retrieve the first path of an inode. If an inode has more then one | |
967 | * ref/hardlink, this is ignored. | |
968 | */ | |
969 | static int get_inode_path(struct send_ctx *sctx, struct btrfs_root *root, | |
970 | u64 ino, struct fs_path *path) | |
971 | { | |
972 | int ret; | |
973 | struct btrfs_key key, found_key; | |
974 | struct btrfs_path *p; | |
975 | ||
976 | p = alloc_path_for_send(); | |
977 | if (!p) | |
978 | return -ENOMEM; | |
979 | ||
980 | fs_path_reset(path); | |
981 | ||
982 | key.objectid = ino; | |
983 | key.type = BTRFS_INODE_REF_KEY; | |
984 | key.offset = 0; | |
985 | ||
986 | ret = btrfs_search_slot_for_read(root, &key, p, 1, 0); | |
987 | if (ret < 0) | |
988 | goto out; | |
989 | if (ret) { | |
990 | ret = 1; | |
991 | goto out; | |
992 | } | |
993 | btrfs_item_key_to_cpu(p->nodes[0], &found_key, p->slots[0]); | |
994 | if (found_key.objectid != ino || | |
995 | found_key.type != BTRFS_INODE_REF_KEY) { | |
996 | ret = -ENOENT; | |
997 | goto out; | |
998 | } | |
999 | ||
1000 | ret = iterate_inode_ref(sctx, root, p, &found_key, 1, | |
1001 | __copy_first_ref, path); | |
1002 | if (ret < 0) | |
1003 | goto out; | |
1004 | ret = 0; | |
1005 | ||
1006 | out: | |
1007 | btrfs_free_path(p); | |
1008 | return ret; | |
1009 | } | |
1010 | ||
1011 | struct backref_ctx { | |
1012 | struct send_ctx *sctx; | |
1013 | ||
1014 | /* number of total found references */ | |
1015 | u64 found; | |
1016 | ||
1017 | /* | |
1018 | * used for clones found in send_root. clones found behind cur_objectid | |
1019 | * and cur_offset are not considered as allowed clones. | |
1020 | */ | |
1021 | u64 cur_objectid; | |
1022 | u64 cur_offset; | |
1023 | ||
1024 | /* may be truncated in case it's the last extent in a file */ | |
1025 | u64 extent_len; | |
1026 | ||
1027 | /* Just to check for bugs in backref resolving */ | |
1028 | int found_in_send_root; | |
1029 | }; | |
1030 | ||
1031 | static int __clone_root_cmp_bsearch(const void *key, const void *elt) | |
1032 | { | |
1033 | u64 root = (u64)key; | |
1034 | struct clone_root *cr = (struct clone_root *)elt; | |
1035 | ||
1036 | if (root < cr->root->objectid) | |
1037 | return -1; | |
1038 | if (root > cr->root->objectid) | |
1039 | return 1; | |
1040 | return 0; | |
1041 | } | |
1042 | ||
1043 | static int __clone_root_cmp_sort(const void *e1, const void *e2) | |
1044 | { | |
1045 | struct clone_root *cr1 = (struct clone_root *)e1; | |
1046 | struct clone_root *cr2 = (struct clone_root *)e2; | |
1047 | ||
1048 | if (cr1->root->objectid < cr2->root->objectid) | |
1049 | return -1; | |
1050 | if (cr1->root->objectid > cr2->root->objectid) | |
1051 | return 1; | |
1052 | return 0; | |
1053 | } | |
1054 | ||
1055 | /* | |
1056 | * Called for every backref that is found for the current extent. | |
1057 | */ | |
1058 | static int __iterate_backrefs(u64 ino, u64 offset, u64 root, void *ctx_) | |
1059 | { | |
1060 | struct backref_ctx *bctx = ctx_; | |
1061 | struct clone_root *found; | |
1062 | int ret; | |
1063 | u64 i_size; | |
1064 | ||
1065 | /* First check if the root is in the list of accepted clone sources */ | |
1066 | found = bsearch((void *)root, bctx->sctx->clone_roots, | |
1067 | bctx->sctx->clone_roots_cnt, | |
1068 | sizeof(struct clone_root), | |
1069 | __clone_root_cmp_bsearch); | |
1070 | if (!found) | |
1071 | return 0; | |
1072 | ||
1073 | if (found->root == bctx->sctx->send_root && | |
1074 | ino == bctx->cur_objectid && | |
1075 | offset == bctx->cur_offset) { | |
1076 | bctx->found_in_send_root = 1; | |
1077 | } | |
1078 | ||
1079 | /* | |
1080 | * There are inodes that have extents that lie behind it's i_size. Don't | |
1081 | * accept clones from these extents. | |
1082 | */ | |
1083 | ret = get_inode_info(found->root, ino, &i_size, NULL, NULL, NULL, NULL); | |
1084 | if (ret < 0) | |
1085 | return ret; | |
1086 | ||
1087 | if (offset + bctx->extent_len > i_size) | |
1088 | return 0; | |
1089 | ||
1090 | /* | |
1091 | * Make sure we don't consider clones from send_root that are | |
1092 | * behind the current inode/offset. | |
1093 | */ | |
1094 | if (found->root == bctx->sctx->send_root) { | |
1095 | /* | |
1096 | * TODO for the moment we don't accept clones from the inode | |
1097 | * that is currently send. We may change this when | |
1098 | * BTRFS_IOC_CLONE_RANGE supports cloning from and to the same | |
1099 | * file. | |
1100 | */ | |
1101 | if (ino >= bctx->cur_objectid) | |
1102 | return 0; | |
1103 | /*if (ino > ctx->cur_objectid) | |
1104 | return 0; | |
1105 | if (offset + ctx->extent_len > ctx->cur_offset) | |
1106 | return 0;*/ | |
1107 | ||
1108 | bctx->found++; | |
1109 | found->found_refs++; | |
1110 | found->ino = ino; | |
1111 | found->offset = offset; | |
1112 | return 0; | |
1113 | } | |
1114 | ||
1115 | bctx->found++; | |
1116 | found->found_refs++; | |
1117 | if (ino < found->ino) { | |
1118 | found->ino = ino; | |
1119 | found->offset = offset; | |
1120 | } else if (found->ino == ino) { | |
1121 | /* | |
1122 | * same extent found more then once in the same file. | |
1123 | */ | |
1124 | if (found->offset > offset + bctx->extent_len) | |
1125 | found->offset = offset; | |
1126 | } | |
1127 | ||
1128 | return 0; | |
1129 | } | |
1130 | ||
1131 | /* | |
1132 | * path must point to the extent item when called. | |
1133 | */ | |
1134 | static int find_extent_clone(struct send_ctx *sctx, | |
1135 | struct btrfs_path *path, | |
1136 | u64 ino, u64 data_offset, | |
1137 | u64 ino_size, | |
1138 | struct clone_root **found) | |
1139 | { | |
1140 | int ret; | |
1141 | int extent_type; | |
1142 | u64 logical; | |
1143 | u64 num_bytes; | |
1144 | u64 extent_item_pos; | |
1145 | struct btrfs_file_extent_item *fi; | |
1146 | struct extent_buffer *eb = path->nodes[0]; | |
1147 | struct backref_ctx backref_ctx; | |
1148 | struct clone_root *cur_clone_root; | |
1149 | struct btrfs_key found_key; | |
1150 | struct btrfs_path *tmp_path; | |
1151 | u32 i; | |
1152 | ||
1153 | tmp_path = alloc_path_for_send(); | |
1154 | if (!tmp_path) | |
1155 | return -ENOMEM; | |
1156 | ||
1157 | if (data_offset >= ino_size) { | |
1158 | /* | |
1159 | * There may be extents that lie behind the file's size. | |
1160 | * I at least had this in combination with snapshotting while | |
1161 | * writing large files. | |
1162 | */ | |
1163 | ret = 0; | |
1164 | goto out; | |
1165 | } | |
1166 | ||
1167 | fi = btrfs_item_ptr(eb, path->slots[0], | |
1168 | struct btrfs_file_extent_item); | |
1169 | extent_type = btrfs_file_extent_type(eb, fi); | |
1170 | if (extent_type == BTRFS_FILE_EXTENT_INLINE) { | |
1171 | ret = -ENOENT; | |
1172 | goto out; | |
1173 | } | |
1174 | ||
1175 | num_bytes = btrfs_file_extent_num_bytes(eb, fi); | |
1176 | logical = btrfs_file_extent_disk_bytenr(eb, fi); | |
1177 | if (logical == 0) { | |
1178 | ret = -ENOENT; | |
1179 | goto out; | |
1180 | } | |
1181 | logical += btrfs_file_extent_offset(eb, fi); | |
1182 | ||
1183 | ret = extent_from_logical(sctx->send_root->fs_info, | |
1184 | logical, tmp_path, &found_key); | |
1185 | btrfs_release_path(tmp_path); | |
1186 | ||
1187 | if (ret < 0) | |
1188 | goto out; | |
1189 | if (ret & BTRFS_EXTENT_FLAG_TREE_BLOCK) { | |
1190 | ret = -EIO; | |
1191 | goto out; | |
1192 | } | |
1193 | ||
1194 | /* | |
1195 | * Setup the clone roots. | |
1196 | */ | |
1197 | for (i = 0; i < sctx->clone_roots_cnt; i++) { | |
1198 | cur_clone_root = sctx->clone_roots + i; | |
1199 | cur_clone_root->ino = (u64)-1; | |
1200 | cur_clone_root->offset = 0; | |
1201 | cur_clone_root->found_refs = 0; | |
1202 | } | |
1203 | ||
1204 | backref_ctx.sctx = sctx; | |
1205 | backref_ctx.found = 0; | |
1206 | backref_ctx.cur_objectid = ino; | |
1207 | backref_ctx.cur_offset = data_offset; | |
1208 | backref_ctx.found_in_send_root = 0; | |
1209 | backref_ctx.extent_len = num_bytes; | |
1210 | ||
1211 | /* | |
1212 | * The last extent of a file may be too large due to page alignment. | |
1213 | * We need to adjust extent_len in this case so that the checks in | |
1214 | * __iterate_backrefs work. | |
1215 | */ | |
1216 | if (data_offset + num_bytes >= ino_size) | |
1217 | backref_ctx.extent_len = ino_size - data_offset; | |
1218 | ||
1219 | /* | |
1220 | * Now collect all backrefs. | |
1221 | */ | |
1222 | extent_item_pos = logical - found_key.objectid; | |
1223 | ret = iterate_extent_inodes(sctx->send_root->fs_info, | |
1224 | found_key.objectid, extent_item_pos, 1, | |
1225 | __iterate_backrefs, &backref_ctx); | |
1226 | if (ret < 0) | |
1227 | goto out; | |
1228 | ||
1229 | if (!backref_ctx.found_in_send_root) { | |
1230 | /* found a bug in backref code? */ | |
1231 | ret = -EIO; | |
1232 | printk(KERN_ERR "btrfs: ERROR did not find backref in " | |
1233 | "send_root. inode=%llu, offset=%llu, " | |
1234 | "logical=%llu\n", | |
1235 | ino, data_offset, logical); | |
1236 | goto out; | |
1237 | } | |
1238 | ||
1239 | verbose_printk(KERN_DEBUG "btrfs: find_extent_clone: data_offset=%llu, " | |
1240 | "ino=%llu, " | |
1241 | "num_bytes=%llu, logical=%llu\n", | |
1242 | data_offset, ino, num_bytes, logical); | |
1243 | ||
1244 | if (!backref_ctx.found) | |
1245 | verbose_printk("btrfs: no clones found\n"); | |
1246 | ||
1247 | cur_clone_root = NULL; | |
1248 | for (i = 0; i < sctx->clone_roots_cnt; i++) { | |
1249 | if (sctx->clone_roots[i].found_refs) { | |
1250 | if (!cur_clone_root) | |
1251 | cur_clone_root = sctx->clone_roots + i; | |
1252 | else if (sctx->clone_roots[i].root == sctx->send_root) | |
1253 | /* prefer clones from send_root over others */ | |
1254 | cur_clone_root = sctx->clone_roots + i; | |
1255 | break; | |
1256 | } | |
1257 | ||
1258 | } | |
1259 | ||
1260 | if (cur_clone_root) { | |
1261 | *found = cur_clone_root; | |
1262 | ret = 0; | |
1263 | } else { | |
1264 | ret = -ENOENT; | |
1265 | } | |
1266 | ||
1267 | out: | |
1268 | btrfs_free_path(tmp_path); | |
1269 | return ret; | |
1270 | } | |
1271 | ||
1272 | static int read_symlink(struct send_ctx *sctx, | |
1273 | struct btrfs_root *root, | |
1274 | u64 ino, | |
1275 | struct fs_path *dest) | |
1276 | { | |
1277 | int ret; | |
1278 | struct btrfs_path *path; | |
1279 | struct btrfs_key key; | |
1280 | struct btrfs_file_extent_item *ei; | |
1281 | u8 type; | |
1282 | u8 compression; | |
1283 | unsigned long off; | |
1284 | int len; | |
1285 | ||
1286 | path = alloc_path_for_send(); | |
1287 | if (!path) | |
1288 | return -ENOMEM; | |
1289 | ||
1290 | key.objectid = ino; | |
1291 | key.type = BTRFS_EXTENT_DATA_KEY; | |
1292 | key.offset = 0; | |
1293 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1294 | if (ret < 0) | |
1295 | goto out; | |
1296 | BUG_ON(ret); | |
1297 | ||
1298 | ei = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
1299 | struct btrfs_file_extent_item); | |
1300 | type = btrfs_file_extent_type(path->nodes[0], ei); | |
1301 | compression = btrfs_file_extent_compression(path->nodes[0], ei); | |
1302 | BUG_ON(type != BTRFS_FILE_EXTENT_INLINE); | |
1303 | BUG_ON(compression); | |
1304 | ||
1305 | off = btrfs_file_extent_inline_start(ei); | |
1306 | len = btrfs_file_extent_inline_len(path->nodes[0], ei); | |
1307 | ||
1308 | ret = fs_path_add_from_extent_buffer(dest, path->nodes[0], off, len); | |
1309 | if (ret < 0) | |
1310 | goto out; | |
1311 | ||
1312 | out: | |
1313 | btrfs_free_path(path); | |
1314 | return ret; | |
1315 | } | |
1316 | ||
1317 | /* | |
1318 | * Helper function to generate a file name that is unique in the root of | |
1319 | * send_root and parent_root. This is used to generate names for orphan inodes. | |
1320 | */ | |
1321 | static int gen_unique_name(struct send_ctx *sctx, | |
1322 | u64 ino, u64 gen, | |
1323 | struct fs_path *dest) | |
1324 | { | |
1325 | int ret = 0; | |
1326 | struct btrfs_path *path; | |
1327 | struct btrfs_dir_item *di; | |
1328 | char tmp[64]; | |
1329 | int len; | |
1330 | u64 idx = 0; | |
1331 | ||
1332 | path = alloc_path_for_send(); | |
1333 | if (!path) | |
1334 | return -ENOMEM; | |
1335 | ||
1336 | while (1) { | |
1337 | len = snprintf(tmp, sizeof(tmp) - 1, "o%llu-%llu-%llu", | |
1338 | ino, gen, idx); | |
1339 | if (len >= sizeof(tmp)) { | |
1340 | /* should really not happen */ | |
1341 | ret = -EOVERFLOW; | |
1342 | goto out; | |
1343 | } | |
1344 | ||
1345 | di = btrfs_lookup_dir_item(NULL, sctx->send_root, | |
1346 | path, BTRFS_FIRST_FREE_OBJECTID, | |
1347 | tmp, strlen(tmp), 0); | |
1348 | btrfs_release_path(path); | |
1349 | if (IS_ERR(di)) { | |
1350 | ret = PTR_ERR(di); | |
1351 | goto out; | |
1352 | } | |
1353 | if (di) { | |
1354 | /* not unique, try again */ | |
1355 | idx++; | |
1356 | continue; | |
1357 | } | |
1358 | ||
1359 | if (!sctx->parent_root) { | |
1360 | /* unique */ | |
1361 | ret = 0; | |
1362 | break; | |
1363 | } | |
1364 | ||
1365 | di = btrfs_lookup_dir_item(NULL, sctx->parent_root, | |
1366 | path, BTRFS_FIRST_FREE_OBJECTID, | |
1367 | tmp, strlen(tmp), 0); | |
1368 | btrfs_release_path(path); | |
1369 | if (IS_ERR(di)) { | |
1370 | ret = PTR_ERR(di); | |
1371 | goto out; | |
1372 | } | |
1373 | if (di) { | |
1374 | /* not unique, try again */ | |
1375 | idx++; | |
1376 | continue; | |
1377 | } | |
1378 | /* unique */ | |
1379 | break; | |
1380 | } | |
1381 | ||
1382 | ret = fs_path_add(dest, tmp, strlen(tmp)); | |
1383 | ||
1384 | out: | |
1385 | btrfs_free_path(path); | |
1386 | return ret; | |
1387 | } | |
1388 | ||
1389 | enum inode_state { | |
1390 | inode_state_no_change, | |
1391 | inode_state_will_create, | |
1392 | inode_state_did_create, | |
1393 | inode_state_will_delete, | |
1394 | inode_state_did_delete, | |
1395 | }; | |
1396 | ||
1397 | static int get_cur_inode_state(struct send_ctx *sctx, u64 ino, u64 gen) | |
1398 | { | |
1399 | int ret; | |
1400 | int left_ret; | |
1401 | int right_ret; | |
1402 | u64 left_gen; | |
1403 | u64 right_gen; | |
1404 | ||
1405 | ret = get_inode_info(sctx->send_root, ino, NULL, &left_gen, NULL, NULL, | |
1406 | NULL); | |
1407 | if (ret < 0 && ret != -ENOENT) | |
1408 | goto out; | |
1409 | left_ret = ret; | |
1410 | ||
1411 | if (!sctx->parent_root) { | |
1412 | right_ret = -ENOENT; | |
1413 | } else { | |
1414 | ret = get_inode_info(sctx->parent_root, ino, NULL, &right_gen, | |
1415 | NULL, NULL, NULL); | |
1416 | if (ret < 0 && ret != -ENOENT) | |
1417 | goto out; | |
1418 | right_ret = ret; | |
1419 | } | |
1420 | ||
1421 | if (!left_ret && !right_ret) { | |
1422 | if (left_gen == gen && right_gen == gen) | |
1423 | ret = inode_state_no_change; | |
1424 | else if (left_gen == gen) { | |
1425 | if (ino < sctx->send_progress) | |
1426 | ret = inode_state_did_create; | |
1427 | else | |
1428 | ret = inode_state_will_create; | |
1429 | } else if (right_gen == gen) { | |
1430 | if (ino < sctx->send_progress) | |
1431 | ret = inode_state_did_delete; | |
1432 | else | |
1433 | ret = inode_state_will_delete; | |
1434 | } else { | |
1435 | ret = -ENOENT; | |
1436 | } | |
1437 | } else if (!left_ret) { | |
1438 | if (left_gen == gen) { | |
1439 | if (ino < sctx->send_progress) | |
1440 | ret = inode_state_did_create; | |
1441 | else | |
1442 | ret = inode_state_will_create; | |
1443 | } else { | |
1444 | ret = -ENOENT; | |
1445 | } | |
1446 | } else if (!right_ret) { | |
1447 | if (right_gen == gen) { | |
1448 | if (ino < sctx->send_progress) | |
1449 | ret = inode_state_did_delete; | |
1450 | else | |
1451 | ret = inode_state_will_delete; | |
1452 | } else { | |
1453 | ret = -ENOENT; | |
1454 | } | |
1455 | } else { | |
1456 | ret = -ENOENT; | |
1457 | } | |
1458 | ||
1459 | out: | |
1460 | return ret; | |
1461 | } | |
1462 | ||
1463 | static int is_inode_existent(struct send_ctx *sctx, u64 ino, u64 gen) | |
1464 | { | |
1465 | int ret; | |
1466 | ||
1467 | ret = get_cur_inode_state(sctx, ino, gen); | |
1468 | if (ret < 0) | |
1469 | goto out; | |
1470 | ||
1471 | if (ret == inode_state_no_change || | |
1472 | ret == inode_state_did_create || | |
1473 | ret == inode_state_will_delete) | |
1474 | ret = 1; | |
1475 | else | |
1476 | ret = 0; | |
1477 | ||
1478 | out: | |
1479 | return ret; | |
1480 | } | |
1481 | ||
1482 | /* | |
1483 | * Helper function to lookup a dir item in a dir. | |
1484 | */ | |
1485 | static int lookup_dir_item_inode(struct btrfs_root *root, | |
1486 | u64 dir, const char *name, int name_len, | |
1487 | u64 *found_inode, | |
1488 | u8 *found_type) | |
1489 | { | |
1490 | int ret = 0; | |
1491 | struct btrfs_dir_item *di; | |
1492 | struct btrfs_key key; | |
1493 | struct btrfs_path *path; | |
1494 | ||
1495 | path = alloc_path_for_send(); | |
1496 | if (!path) | |
1497 | return -ENOMEM; | |
1498 | ||
1499 | di = btrfs_lookup_dir_item(NULL, root, path, | |
1500 | dir, name, name_len, 0); | |
1501 | if (!di) { | |
1502 | ret = -ENOENT; | |
1503 | goto out; | |
1504 | } | |
1505 | if (IS_ERR(di)) { | |
1506 | ret = PTR_ERR(di); | |
1507 | goto out; | |
1508 | } | |
1509 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key); | |
1510 | *found_inode = key.objectid; | |
1511 | *found_type = btrfs_dir_type(path->nodes[0], di); | |
1512 | ||
1513 | out: | |
1514 | btrfs_free_path(path); | |
1515 | return ret; | |
1516 | } | |
1517 | ||
1518 | static int get_first_ref(struct send_ctx *sctx, | |
1519 | struct btrfs_root *root, u64 ino, | |
1520 | u64 *dir, u64 *dir_gen, struct fs_path *name) | |
1521 | { | |
1522 | int ret; | |
1523 | struct btrfs_key key; | |
1524 | struct btrfs_key found_key; | |
1525 | struct btrfs_path *path; | |
1526 | struct btrfs_inode_ref *iref; | |
1527 | int len; | |
1528 | ||
1529 | path = alloc_path_for_send(); | |
1530 | if (!path) | |
1531 | return -ENOMEM; | |
1532 | ||
1533 | key.objectid = ino; | |
1534 | key.type = BTRFS_INODE_REF_KEY; | |
1535 | key.offset = 0; | |
1536 | ||
1537 | ret = btrfs_search_slot_for_read(root, &key, path, 1, 0); | |
1538 | if (ret < 0) | |
1539 | goto out; | |
1540 | if (!ret) | |
1541 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
1542 | path->slots[0]); | |
1543 | if (ret || found_key.objectid != key.objectid || | |
1544 | found_key.type != key.type) { | |
1545 | ret = -ENOENT; | |
1546 | goto out; | |
1547 | } | |
1548 | ||
1549 | iref = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
1550 | struct btrfs_inode_ref); | |
1551 | len = btrfs_inode_ref_name_len(path->nodes[0], iref); | |
1552 | ret = fs_path_add_from_extent_buffer(name, path->nodes[0], | |
1553 | (unsigned long)(iref + 1), len); | |
1554 | if (ret < 0) | |
1555 | goto out; | |
1556 | btrfs_release_path(path); | |
1557 | ||
1558 | ret = get_inode_info(root, found_key.offset, NULL, dir_gen, NULL, NULL, | |
1559 | NULL); | |
1560 | if (ret < 0) | |
1561 | goto out; | |
1562 | ||
1563 | *dir = found_key.offset; | |
1564 | ||
1565 | out: | |
1566 | btrfs_free_path(path); | |
1567 | return ret; | |
1568 | } | |
1569 | ||
1570 | static int is_first_ref(struct send_ctx *sctx, | |
1571 | struct btrfs_root *root, | |
1572 | u64 ino, u64 dir, | |
1573 | const char *name, int name_len) | |
1574 | { | |
1575 | int ret; | |
1576 | struct fs_path *tmp_name; | |
1577 | u64 tmp_dir; | |
1578 | u64 tmp_dir_gen; | |
1579 | ||
1580 | tmp_name = fs_path_alloc(sctx); | |
1581 | if (!tmp_name) | |
1582 | return -ENOMEM; | |
1583 | ||
1584 | ret = get_first_ref(sctx, root, ino, &tmp_dir, &tmp_dir_gen, tmp_name); | |
1585 | if (ret < 0) | |
1586 | goto out; | |
1587 | ||
1588 | if (name_len != fs_path_len(tmp_name)) { | |
1589 | ret = 0; | |
1590 | goto out; | |
1591 | } | |
1592 | ||
1593 | ret = memcmp(tmp_name->start, name, name_len); | |
1594 | if (ret) | |
1595 | ret = 0; | |
1596 | else | |
1597 | ret = 1; | |
1598 | ||
1599 | out: | |
1600 | fs_path_free(sctx, tmp_name); | |
1601 | return ret; | |
1602 | } | |
1603 | ||
1604 | static int will_overwrite_ref(struct send_ctx *sctx, u64 dir, u64 dir_gen, | |
1605 | const char *name, int name_len, | |
1606 | u64 *who_ino, u64 *who_gen) | |
1607 | { | |
1608 | int ret = 0; | |
1609 | u64 other_inode = 0; | |
1610 | u8 other_type = 0; | |
1611 | ||
1612 | if (!sctx->parent_root) | |
1613 | goto out; | |
1614 | ||
1615 | ret = is_inode_existent(sctx, dir, dir_gen); | |
1616 | if (ret <= 0) | |
1617 | goto out; | |
1618 | ||
1619 | ret = lookup_dir_item_inode(sctx->parent_root, dir, name, name_len, | |
1620 | &other_inode, &other_type); | |
1621 | if (ret < 0 && ret != -ENOENT) | |
1622 | goto out; | |
1623 | if (ret) { | |
1624 | ret = 0; | |
1625 | goto out; | |
1626 | } | |
1627 | ||
1628 | if (other_inode > sctx->send_progress) { | |
1629 | ret = get_inode_info(sctx->parent_root, other_inode, NULL, | |
1630 | who_gen, NULL, NULL, NULL); | |
1631 | if (ret < 0) | |
1632 | goto out; | |
1633 | ||
1634 | ret = 1; | |
1635 | *who_ino = other_inode; | |
1636 | } else { | |
1637 | ret = 0; | |
1638 | } | |
1639 | ||
1640 | out: | |
1641 | return ret; | |
1642 | } | |
1643 | ||
1644 | static int did_overwrite_ref(struct send_ctx *sctx, | |
1645 | u64 dir, u64 dir_gen, | |
1646 | u64 ino, u64 ino_gen, | |
1647 | const char *name, int name_len) | |
1648 | { | |
1649 | int ret = 0; | |
1650 | u64 gen; | |
1651 | u64 ow_inode; | |
1652 | u8 other_type; | |
1653 | ||
1654 | if (!sctx->parent_root) | |
1655 | goto out; | |
1656 | ||
1657 | ret = is_inode_existent(sctx, dir, dir_gen); | |
1658 | if (ret <= 0) | |
1659 | goto out; | |
1660 | ||
1661 | /* check if the ref was overwritten by another ref */ | |
1662 | ret = lookup_dir_item_inode(sctx->send_root, dir, name, name_len, | |
1663 | &ow_inode, &other_type); | |
1664 | if (ret < 0 && ret != -ENOENT) | |
1665 | goto out; | |
1666 | if (ret) { | |
1667 | /* was never and will never be overwritten */ | |
1668 | ret = 0; | |
1669 | goto out; | |
1670 | } | |
1671 | ||
1672 | ret = get_inode_info(sctx->send_root, ow_inode, NULL, &gen, NULL, NULL, | |
1673 | NULL); | |
1674 | if (ret < 0) | |
1675 | goto out; | |
1676 | ||
1677 | if (ow_inode == ino && gen == ino_gen) { | |
1678 | ret = 0; | |
1679 | goto out; | |
1680 | } | |
1681 | ||
1682 | /* we know that it is or will be overwritten. check this now */ | |
1683 | if (ow_inode < sctx->send_progress) | |
1684 | ret = 1; | |
1685 | else | |
1686 | ret = 0; | |
1687 | ||
1688 | out: | |
1689 | return ret; | |
1690 | } | |
1691 | ||
1692 | static int did_overwrite_first_ref(struct send_ctx *sctx, u64 ino, u64 gen) | |
1693 | { | |
1694 | int ret = 0; | |
1695 | struct fs_path *name = NULL; | |
1696 | u64 dir; | |
1697 | u64 dir_gen; | |
1698 | ||
1699 | if (!sctx->parent_root) | |
1700 | goto out; | |
1701 | ||
1702 | name = fs_path_alloc(sctx); | |
1703 | if (!name) | |
1704 | return -ENOMEM; | |
1705 | ||
1706 | ret = get_first_ref(sctx, sctx->parent_root, ino, &dir, &dir_gen, name); | |
1707 | if (ret < 0) | |
1708 | goto out; | |
1709 | ||
1710 | ret = did_overwrite_ref(sctx, dir, dir_gen, ino, gen, | |
1711 | name->start, fs_path_len(name)); | |
1712 | if (ret < 0) | |
1713 | goto out; | |
1714 | ||
1715 | out: | |
1716 | fs_path_free(sctx, name); | |
1717 | return ret; | |
1718 | } | |
1719 | ||
1720 | static int name_cache_insert(struct send_ctx *sctx, | |
1721 | struct name_cache_entry *nce) | |
1722 | { | |
1723 | int ret = 0; | |
1724 | struct name_cache_entry **ncea; | |
1725 | ||
1726 | ncea = radix_tree_lookup(&sctx->name_cache, nce->ino); | |
1727 | if (ncea) { | |
1728 | if (!ncea[0]) | |
1729 | ncea[0] = nce; | |
1730 | else if (!ncea[1]) | |
1731 | ncea[1] = nce; | |
1732 | else | |
1733 | BUG(); | |
1734 | } else { | |
1735 | ncea = kmalloc(sizeof(void *) * 2, GFP_NOFS); | |
1736 | if (!ncea) | |
1737 | return -ENOMEM; | |
1738 | ||
1739 | ncea[0] = nce; | |
1740 | ncea[1] = NULL; | |
1741 | ret = radix_tree_insert(&sctx->name_cache, nce->ino, ncea); | |
1742 | if (ret < 0) | |
1743 | return ret; | |
1744 | } | |
1745 | list_add_tail(&nce->list, &sctx->name_cache_list); | |
1746 | sctx->name_cache_size++; | |
1747 | ||
1748 | return ret; | |
1749 | } | |
1750 | ||
1751 | static void name_cache_delete(struct send_ctx *sctx, | |
1752 | struct name_cache_entry *nce) | |
1753 | { | |
1754 | struct name_cache_entry **ncea; | |
1755 | ||
1756 | ncea = radix_tree_lookup(&sctx->name_cache, nce->ino); | |
1757 | BUG_ON(!ncea); | |
1758 | ||
1759 | if (ncea[0] == nce) | |
1760 | ncea[0] = NULL; | |
1761 | else if (ncea[1] == nce) | |
1762 | ncea[1] = NULL; | |
1763 | else | |
1764 | BUG(); | |
1765 | ||
1766 | if (!ncea[0] && !ncea[1]) { | |
1767 | radix_tree_delete(&sctx->name_cache, nce->ino); | |
1768 | kfree(ncea); | |
1769 | } | |
1770 | ||
1771 | list_del(&nce->list); | |
1772 | ||
1773 | sctx->name_cache_size--; | |
1774 | } | |
1775 | ||
1776 | static struct name_cache_entry *name_cache_search(struct send_ctx *sctx, | |
1777 | u64 ino, u64 gen) | |
1778 | { | |
1779 | struct name_cache_entry **ncea; | |
1780 | ||
1781 | ncea = radix_tree_lookup(&sctx->name_cache, ino); | |
1782 | if (!ncea) | |
1783 | return NULL; | |
1784 | ||
1785 | if (ncea[0] && ncea[0]->gen == gen) | |
1786 | return ncea[0]; | |
1787 | else if (ncea[1] && ncea[1]->gen == gen) | |
1788 | return ncea[1]; | |
1789 | return NULL; | |
1790 | } | |
1791 | ||
1792 | static void name_cache_used(struct send_ctx *sctx, struct name_cache_entry *nce) | |
1793 | { | |
1794 | list_del(&nce->list); | |
1795 | list_add_tail(&nce->list, &sctx->name_cache_list); | |
1796 | } | |
1797 | ||
1798 | static void name_cache_clean_unused(struct send_ctx *sctx) | |
1799 | { | |
1800 | struct name_cache_entry *nce; | |
1801 | ||
1802 | if (sctx->name_cache_size < SEND_CTX_NAME_CACHE_CLEAN_SIZE) | |
1803 | return; | |
1804 | ||
1805 | while (sctx->name_cache_size > SEND_CTX_MAX_NAME_CACHE_SIZE) { | |
1806 | nce = list_entry(sctx->name_cache_list.next, | |
1807 | struct name_cache_entry, list); | |
1808 | name_cache_delete(sctx, nce); | |
1809 | kfree(nce); | |
1810 | } | |
1811 | } | |
1812 | ||
1813 | static void name_cache_free(struct send_ctx *sctx) | |
1814 | { | |
1815 | struct name_cache_entry *nce; | |
1816 | struct name_cache_entry *tmp; | |
1817 | ||
1818 | list_for_each_entry_safe(nce, tmp, &sctx->name_cache_list, list) { | |
1819 | name_cache_delete(sctx, nce); | |
1820 | } | |
1821 | } | |
1822 | ||
1823 | static int __get_cur_name_and_parent(struct send_ctx *sctx, | |
1824 | u64 ino, u64 gen, | |
1825 | u64 *parent_ino, | |
1826 | u64 *parent_gen, | |
1827 | struct fs_path *dest) | |
1828 | { | |
1829 | int ret; | |
1830 | int nce_ret; | |
1831 | struct btrfs_path *path = NULL; | |
1832 | struct name_cache_entry *nce = NULL; | |
1833 | ||
1834 | nce = name_cache_search(sctx, ino, gen); | |
1835 | if (nce) { | |
1836 | if (ino < sctx->send_progress && nce->need_later_update) { | |
1837 | name_cache_delete(sctx, nce); | |
1838 | kfree(nce); | |
1839 | nce = NULL; | |
1840 | } else { | |
1841 | name_cache_used(sctx, nce); | |
1842 | *parent_ino = nce->parent_ino; | |
1843 | *parent_gen = nce->parent_gen; | |
1844 | ret = fs_path_add(dest, nce->name, nce->name_len); | |
1845 | if (ret < 0) | |
1846 | goto out; | |
1847 | ret = nce->ret; | |
1848 | goto out; | |
1849 | } | |
1850 | } | |
1851 | ||
1852 | path = alloc_path_for_send(); | |
1853 | if (!path) | |
1854 | return -ENOMEM; | |
1855 | ||
1856 | ret = is_inode_existent(sctx, ino, gen); | |
1857 | if (ret < 0) | |
1858 | goto out; | |
1859 | ||
1860 | if (!ret) { | |
1861 | ret = gen_unique_name(sctx, ino, gen, dest); | |
1862 | if (ret < 0) | |
1863 | goto out; | |
1864 | ret = 1; | |
1865 | goto out_cache; | |
1866 | } | |
1867 | ||
1868 | if (ino < sctx->send_progress) | |
1869 | ret = get_first_ref(sctx, sctx->send_root, ino, | |
1870 | parent_ino, parent_gen, dest); | |
1871 | else | |
1872 | ret = get_first_ref(sctx, sctx->parent_root, ino, | |
1873 | parent_ino, parent_gen, dest); | |
1874 | if (ret < 0) | |
1875 | goto out; | |
1876 | ||
1877 | ret = did_overwrite_ref(sctx, *parent_ino, *parent_gen, ino, gen, | |
1878 | dest->start, dest->end - dest->start); | |
1879 | if (ret < 0) | |
1880 | goto out; | |
1881 | if (ret) { | |
1882 | fs_path_reset(dest); | |
1883 | ret = gen_unique_name(sctx, ino, gen, dest); | |
1884 | if (ret < 0) | |
1885 | goto out; | |
1886 | ret = 1; | |
1887 | } | |
1888 | ||
1889 | out_cache: | |
1890 | nce = kmalloc(sizeof(*nce) + fs_path_len(dest) + 1, GFP_NOFS); | |
1891 | if (!nce) { | |
1892 | ret = -ENOMEM; | |
1893 | goto out; | |
1894 | } | |
1895 | ||
1896 | nce->ino = ino; | |
1897 | nce->gen = gen; | |
1898 | nce->parent_ino = *parent_ino; | |
1899 | nce->parent_gen = *parent_gen; | |
1900 | nce->name_len = fs_path_len(dest); | |
1901 | nce->ret = ret; | |
1902 | strcpy(nce->name, dest->start); | |
1903 | memset(&nce->use_list, 0, sizeof(nce->use_list)); | |
1904 | ||
1905 | if (ino < sctx->send_progress) | |
1906 | nce->need_later_update = 0; | |
1907 | else | |
1908 | nce->need_later_update = 1; | |
1909 | ||
1910 | nce_ret = name_cache_insert(sctx, nce); | |
1911 | if (nce_ret < 0) | |
1912 | ret = nce_ret; | |
1913 | name_cache_clean_unused(sctx); | |
1914 | ||
1915 | out: | |
1916 | btrfs_free_path(path); | |
1917 | return ret; | |
1918 | } | |
1919 | ||
1920 | /* | |
1921 | * Magic happens here. This function returns the first ref to an inode as it | |
1922 | * would look like while receiving the stream at this point in time. | |
1923 | * We walk the path up to the root. For every inode in between, we check if it | |
1924 | * was already processed/sent. If yes, we continue with the parent as found | |
1925 | * in send_root. If not, we continue with the parent as found in parent_root. | |
1926 | * If we encounter an inode that was deleted at this point in time, we use the | |
1927 | * inodes "orphan" name instead of the real name and stop. Same with new inodes | |
1928 | * that were not created yet and overwritten inodes/refs. | |
1929 | * | |
1930 | * When do we have have orphan inodes: | |
1931 | * 1. When an inode is freshly created and thus no valid refs are available yet | |
1932 | * 2. When a directory lost all it's refs (deleted) but still has dir items | |
1933 | * inside which were not processed yet (pending for move/delete). If anyone | |
1934 | * tried to get the path to the dir items, it would get a path inside that | |
1935 | * orphan directory. | |
1936 | * 3. When an inode is moved around or gets new links, it may overwrite the ref | |
1937 | * of an unprocessed inode. If in that case the first ref would be | |
1938 | * overwritten, the overwritten inode gets "orphanized". Later when we | |
1939 | * process this overwritten inode, it is restored at a new place by moving | |
1940 | * the orphan inode. | |
1941 | * | |
1942 | * sctx->send_progress tells this function at which point in time receiving | |
1943 | * would be. | |
1944 | */ | |
1945 | static int get_cur_path(struct send_ctx *sctx, u64 ino, u64 gen, | |
1946 | struct fs_path *dest) | |
1947 | { | |
1948 | int ret = 0; | |
1949 | struct fs_path *name = NULL; | |
1950 | u64 parent_inode = 0; | |
1951 | u64 parent_gen = 0; | |
1952 | int stop = 0; | |
1953 | ||
1954 | name = fs_path_alloc(sctx); | |
1955 | if (!name) { | |
1956 | ret = -ENOMEM; | |
1957 | goto out; | |
1958 | } | |
1959 | ||
1960 | dest->reversed = 1; | |
1961 | fs_path_reset(dest); | |
1962 | ||
1963 | while (!stop && ino != BTRFS_FIRST_FREE_OBJECTID) { | |
1964 | fs_path_reset(name); | |
1965 | ||
1966 | ret = __get_cur_name_and_parent(sctx, ino, gen, | |
1967 | &parent_inode, &parent_gen, name); | |
1968 | if (ret < 0) | |
1969 | goto out; | |
1970 | if (ret) | |
1971 | stop = 1; | |
1972 | ||
1973 | ret = fs_path_add_path(dest, name); | |
1974 | if (ret < 0) | |
1975 | goto out; | |
1976 | ||
1977 | ino = parent_inode; | |
1978 | gen = parent_gen; | |
1979 | } | |
1980 | ||
1981 | out: | |
1982 | fs_path_free(sctx, name); | |
1983 | if (!ret) | |
1984 | fs_path_unreverse(dest); | |
1985 | return ret; | |
1986 | } | |
1987 | ||
1988 | /* | |
1989 | * Called for regular files when sending extents data. Opens a struct file | |
1990 | * to read from the file. | |
1991 | */ | |
1992 | static int open_cur_inode_file(struct send_ctx *sctx) | |
1993 | { | |
1994 | int ret = 0; | |
1995 | struct btrfs_key key; | |
1996 | struct vfsmount *mnt; | |
1997 | struct inode *inode; | |
1998 | struct dentry *dentry; | |
1999 | struct file *filp; | |
2000 | int new = 0; | |
2001 | ||
2002 | if (sctx->cur_inode_filp) | |
2003 | goto out; | |
2004 | ||
2005 | key.objectid = sctx->cur_ino; | |
2006 | key.type = BTRFS_INODE_ITEM_KEY; | |
2007 | key.offset = 0; | |
2008 | ||
2009 | inode = btrfs_iget(sctx->send_root->fs_info->sb, &key, sctx->send_root, | |
2010 | &new); | |
2011 | if (IS_ERR(inode)) { | |
2012 | ret = PTR_ERR(inode); | |
2013 | goto out; | |
2014 | } | |
2015 | ||
2016 | dentry = d_obtain_alias(inode); | |
2017 | inode = NULL; | |
2018 | if (IS_ERR(dentry)) { | |
2019 | ret = PTR_ERR(dentry); | |
2020 | goto out; | |
2021 | } | |
2022 | ||
2023 | mnt = mntget(sctx->mnt); | |
2024 | filp = dentry_open(dentry, mnt, O_RDONLY | O_LARGEFILE, current_cred()); | |
2025 | dentry = NULL; | |
2026 | mnt = NULL; | |
2027 | if (IS_ERR(filp)) { | |
2028 | ret = PTR_ERR(filp); | |
2029 | goto out; | |
2030 | } | |
2031 | sctx->cur_inode_filp = filp; | |
2032 | ||
2033 | out: | |
2034 | /* | |
2035 | * no xxxput required here as every vfs op | |
2036 | * does it by itself on failure | |
2037 | */ | |
2038 | return ret; | |
2039 | } | |
2040 | ||
2041 | /* | |
2042 | * Closes the struct file that was created in open_cur_inode_file | |
2043 | */ | |
2044 | static int close_cur_inode_file(struct send_ctx *sctx) | |
2045 | { | |
2046 | int ret = 0; | |
2047 | ||
2048 | if (!sctx->cur_inode_filp) | |
2049 | goto out; | |
2050 | ||
2051 | ret = filp_close(sctx->cur_inode_filp, NULL); | |
2052 | sctx->cur_inode_filp = NULL; | |
2053 | ||
2054 | out: | |
2055 | return ret; | |
2056 | } | |
2057 | ||
2058 | /* | |
2059 | * Sends a BTRFS_SEND_C_SUBVOL command/item to userspace | |
2060 | */ | |
2061 | static int send_subvol_begin(struct send_ctx *sctx) | |
2062 | { | |
2063 | int ret; | |
2064 | struct btrfs_root *send_root = sctx->send_root; | |
2065 | struct btrfs_root *parent_root = sctx->parent_root; | |
2066 | struct btrfs_path *path; | |
2067 | struct btrfs_key key; | |
2068 | struct btrfs_root_ref *ref; | |
2069 | struct extent_buffer *leaf; | |
2070 | char *name = NULL; | |
2071 | int namelen; | |
2072 | ||
2073 | path = alloc_path_for_send(); | |
2074 | if (!path) | |
2075 | return -ENOMEM; | |
2076 | ||
2077 | name = kmalloc(BTRFS_PATH_NAME_MAX, GFP_NOFS); | |
2078 | if (!name) { | |
2079 | btrfs_free_path(path); | |
2080 | return -ENOMEM; | |
2081 | } | |
2082 | ||
2083 | key.objectid = send_root->objectid; | |
2084 | key.type = BTRFS_ROOT_BACKREF_KEY; | |
2085 | key.offset = 0; | |
2086 | ||
2087 | ret = btrfs_search_slot_for_read(send_root->fs_info->tree_root, | |
2088 | &key, path, 1, 0); | |
2089 | if (ret < 0) | |
2090 | goto out; | |
2091 | if (ret) { | |
2092 | ret = -ENOENT; | |
2093 | goto out; | |
2094 | } | |
2095 | ||
2096 | leaf = path->nodes[0]; | |
2097 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
2098 | if (key.type != BTRFS_ROOT_BACKREF_KEY || | |
2099 | key.objectid != send_root->objectid) { | |
2100 | ret = -ENOENT; | |
2101 | goto out; | |
2102 | } | |
2103 | ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_root_ref); | |
2104 | namelen = btrfs_root_ref_name_len(leaf, ref); | |
2105 | read_extent_buffer(leaf, name, (unsigned long)(ref + 1), namelen); | |
2106 | btrfs_release_path(path); | |
2107 | ||
2108 | if (ret < 0) | |
2109 | goto out; | |
2110 | ||
2111 | if (parent_root) { | |
2112 | ret = begin_cmd(sctx, BTRFS_SEND_C_SNAPSHOT); | |
2113 | if (ret < 0) | |
2114 | goto out; | |
2115 | } else { | |
2116 | ret = begin_cmd(sctx, BTRFS_SEND_C_SUBVOL); | |
2117 | if (ret < 0) | |
2118 | goto out; | |
2119 | } | |
2120 | ||
2121 | TLV_PUT_STRING(sctx, BTRFS_SEND_A_PATH, name, namelen); | |
2122 | TLV_PUT_UUID(sctx, BTRFS_SEND_A_UUID, | |
2123 | sctx->send_root->root_item.uuid); | |
2124 | TLV_PUT_U64(sctx, BTRFS_SEND_A_CTRANSID, | |
2125 | sctx->send_root->root_item.ctransid); | |
2126 | if (parent_root) { | |
2127 | TLV_PUT_UUID(sctx, BTRFS_SEND_A_CLONE_UUID, | |
2128 | sctx->parent_root->root_item.uuid); | |
2129 | TLV_PUT_U64(sctx, BTRFS_SEND_A_CLONE_CTRANSID, | |
2130 | sctx->parent_root->root_item.ctransid); | |
2131 | } | |
2132 | ||
2133 | ret = send_cmd(sctx); | |
2134 | ||
2135 | tlv_put_failure: | |
2136 | out: | |
2137 | btrfs_free_path(path); | |
2138 | kfree(name); | |
2139 | return ret; | |
2140 | } | |
2141 | ||
2142 | static int send_truncate(struct send_ctx *sctx, u64 ino, u64 gen, u64 size) | |
2143 | { | |
2144 | int ret = 0; | |
2145 | struct fs_path *p; | |
2146 | ||
2147 | verbose_printk("btrfs: send_truncate %llu size=%llu\n", ino, size); | |
2148 | ||
2149 | p = fs_path_alloc(sctx); | |
2150 | if (!p) | |
2151 | return -ENOMEM; | |
2152 | ||
2153 | ret = begin_cmd(sctx, BTRFS_SEND_C_TRUNCATE); | |
2154 | if (ret < 0) | |
2155 | goto out; | |
2156 | ||
2157 | ret = get_cur_path(sctx, ino, gen, p); | |
2158 | if (ret < 0) | |
2159 | goto out; | |
2160 | TLV_PUT_PATH(sctx, BTRFS_SEND_A_PATH, p); | |
2161 | TLV_PUT_U64(sctx, BTRFS_SEND_A_SIZE, size); | |
2162 | ||
2163 | ret = send_cmd(sctx); | |
2164 | ||
2165 | tlv_put_failure: | |
2166 | out: | |
2167 | fs_path_free(sctx, p); | |
2168 | return ret; | |
2169 | } | |
2170 | ||
2171 | static int send_chmod(struct send_ctx *sctx, u64 ino, u64 gen, u64 mode) | |
2172 | { | |
2173 | int ret = 0; | |
2174 | struct fs_path *p; | |
2175 | ||
2176 | verbose_printk("btrfs: send_chmod %llu mode=%llu\n", ino, mode); | |
2177 | ||
2178 | p = fs_path_alloc(sctx); | |
2179 | if (!p) | |
2180 | return -ENOMEM; | |
2181 | ||
2182 | ret = begin_cmd(sctx, BTRFS_SEND_C_CHMOD); | |
2183 | if (ret < 0) | |
2184 | goto out; | |
2185 | ||
2186 | ret = get_cur_path(sctx, ino, gen, p); | |
2187 | if (ret < 0) | |
2188 | goto out; | |
2189 | TLV_PUT_PATH(sctx, BTRFS_SEND_A_PATH, p); | |
2190 | TLV_PUT_U64(sctx, BTRFS_SEND_A_MODE, mode & 07777); | |
2191 | ||
2192 | ret = send_cmd(sctx); | |
2193 | ||
2194 | tlv_put_failure: | |
2195 | out: | |
2196 | fs_path_free(sctx, p); | |
2197 | return ret; | |
2198 | } | |
2199 | ||
2200 | static int send_chown(struct send_ctx *sctx, u64 ino, u64 gen, u64 uid, u64 gid) | |
2201 | { | |
2202 | int ret = 0; | |
2203 | struct fs_path *p; | |
2204 | ||
2205 | verbose_printk("btrfs: send_chown %llu uid=%llu, gid=%llu\n", ino, uid, gid); | |
2206 | ||
2207 | p = fs_path_alloc(sctx); | |
2208 | if (!p) | |
2209 | return -ENOMEM; | |
2210 | ||
2211 | ret = begin_cmd(sctx, BTRFS_SEND_C_CHOWN); | |
2212 | if (ret < 0) | |
2213 | goto out; | |
2214 | ||
2215 | ret = get_cur_path(sctx, ino, gen, p); | |
2216 | if (ret < 0) | |
2217 | goto out; | |
2218 | TLV_PUT_PATH(sctx, BTRFS_SEND_A_PATH, p); | |
2219 | TLV_PUT_U64(sctx, BTRFS_SEND_A_UID, uid); | |
2220 | TLV_PUT_U64(sctx, BTRFS_SEND_A_GID, gid); | |
2221 | ||
2222 | ret = send_cmd(sctx); | |
2223 | ||
2224 | tlv_put_failure: | |
2225 | out: | |
2226 | fs_path_free(sctx, p); | |
2227 | return ret; | |
2228 | } | |
2229 | ||
2230 | static int send_utimes(struct send_ctx *sctx, u64 ino, u64 gen) | |
2231 | { | |
2232 | int ret = 0; | |
2233 | struct fs_path *p = NULL; | |
2234 | struct btrfs_inode_item *ii; | |
2235 | struct btrfs_path *path = NULL; | |
2236 | struct extent_buffer *eb; | |
2237 | struct btrfs_key key; | |
2238 | int slot; | |
2239 | ||
2240 | verbose_printk("btrfs: send_utimes %llu\n", ino); | |
2241 | ||
2242 | p = fs_path_alloc(sctx); | |
2243 | if (!p) | |
2244 | return -ENOMEM; | |
2245 | ||
2246 | path = alloc_path_for_send(); | |
2247 | if (!path) { | |
2248 | ret = -ENOMEM; | |
2249 | goto out; | |
2250 | } | |
2251 | ||
2252 | key.objectid = ino; | |
2253 | key.type = BTRFS_INODE_ITEM_KEY; | |
2254 | key.offset = 0; | |
2255 | ret = btrfs_search_slot(NULL, sctx->send_root, &key, path, 0, 0); | |
2256 | if (ret < 0) | |
2257 | goto out; | |
2258 | ||
2259 | eb = path->nodes[0]; | |
2260 | slot = path->slots[0]; | |
2261 | ii = btrfs_item_ptr(eb, slot, struct btrfs_inode_item); | |
2262 | ||
2263 | ret = begin_cmd(sctx, BTRFS_SEND_C_UTIMES); | |
2264 | if (ret < 0) | |
2265 | goto out; | |
2266 | ||
2267 | ret = get_cur_path(sctx, ino, gen, p); | |
2268 | if (ret < 0) | |
2269 | goto out; | |
2270 | TLV_PUT_PATH(sctx, BTRFS_SEND_A_PATH, p); | |
2271 | TLV_PUT_BTRFS_TIMESPEC(sctx, BTRFS_SEND_A_ATIME, eb, | |
2272 | btrfs_inode_atime(ii)); | |
2273 | TLV_PUT_BTRFS_TIMESPEC(sctx, BTRFS_SEND_A_MTIME, eb, | |
2274 | btrfs_inode_mtime(ii)); | |
2275 | TLV_PUT_BTRFS_TIMESPEC(sctx, BTRFS_SEND_A_CTIME, eb, | |
2276 | btrfs_inode_ctime(ii)); | |
2277 | /* TODO otime? */ | |
2278 | ||
2279 | ret = send_cmd(sctx); | |
2280 | ||
2281 | tlv_put_failure: | |
2282 | out: | |
2283 | fs_path_free(sctx, p); | |
2284 | btrfs_free_path(path); | |
2285 | return ret; | |
2286 | } | |
2287 | ||
2288 | /* | |
2289 | * Sends a BTRFS_SEND_C_MKXXX or SYMLINK command to user space. We don't have | |
2290 | * a valid path yet because we did not process the refs yet. So, the inode | |
2291 | * is created as orphan. | |
2292 | */ | |
2293 | static int send_create_inode(struct send_ctx *sctx, struct btrfs_path *path, | |
2294 | struct btrfs_key *key) | |
2295 | { | |
2296 | int ret = 0; | |
2297 | struct extent_buffer *eb = path->nodes[0]; | |
2298 | struct btrfs_inode_item *ii; | |
2299 | struct fs_path *p; | |
2300 | int slot = path->slots[0]; | |
2301 | int cmd; | |
2302 | u64 mode; | |
2303 | ||
2304 | verbose_printk("btrfs: send_create_inode %llu\n", sctx->cur_ino); | |
2305 | ||
2306 | p = fs_path_alloc(sctx); | |
2307 | if (!p) | |
2308 | return -ENOMEM; | |
2309 | ||
2310 | ii = btrfs_item_ptr(eb, slot, struct btrfs_inode_item); | |
2311 | mode = btrfs_inode_mode(eb, ii); | |
2312 | ||
2313 | if (S_ISREG(mode)) | |
2314 | cmd = BTRFS_SEND_C_MKFILE; | |
2315 | else if (S_ISDIR(mode)) | |
2316 | cmd = BTRFS_SEND_C_MKDIR; | |
2317 | else if (S_ISLNK(mode)) | |
2318 | cmd = BTRFS_SEND_C_SYMLINK; | |
2319 | else if (S_ISCHR(mode) || S_ISBLK(mode)) | |
2320 | cmd = BTRFS_SEND_C_MKNOD; | |
2321 | else if (S_ISFIFO(mode)) | |
2322 | cmd = BTRFS_SEND_C_MKFIFO; | |
2323 | else if (S_ISSOCK(mode)) | |
2324 | cmd = BTRFS_SEND_C_MKSOCK; | |
2325 | else { | |
2326 | printk(KERN_WARNING "btrfs: unexpected inode type %o", | |
2327 | (int)(mode & S_IFMT)); | |
2328 | ret = -ENOTSUPP; | |
2329 | goto out; | |
2330 | } | |
2331 | ||
2332 | ret = begin_cmd(sctx, cmd); | |
2333 | if (ret < 0) | |
2334 | goto out; | |
2335 | ||
2336 | ret = gen_unique_name(sctx, sctx->cur_ino, sctx->cur_inode_gen, p); | |
2337 | if (ret < 0) | |
2338 | goto out; | |
2339 | ||
2340 | TLV_PUT_PATH(sctx, BTRFS_SEND_A_PATH, p); | |
2341 | TLV_PUT_U64(sctx, BTRFS_SEND_A_INO, sctx->cur_ino); | |
2342 | ||
2343 | if (S_ISLNK(mode)) { | |
2344 | fs_path_reset(p); | |
2345 | ret = read_symlink(sctx, sctx->send_root, sctx->cur_ino, p); | |
2346 | if (ret < 0) | |
2347 | goto out; | |
2348 | TLV_PUT_PATH(sctx, BTRFS_SEND_A_PATH_LINK, p); | |
2349 | } else if (S_ISCHR(mode) || S_ISBLK(mode) || | |
2350 | S_ISFIFO(mode) || S_ISSOCK(mode)) { | |
2351 | TLV_PUT_U64(sctx, BTRFS_SEND_A_RDEV, btrfs_inode_rdev(eb, ii)); | |
2352 | } | |
2353 | ||
2354 | ret = send_cmd(sctx); | |
2355 | if (ret < 0) | |
2356 | goto out; | |
2357 | ||
2358 | ||
2359 | tlv_put_failure: | |
2360 | out: | |
2361 | fs_path_free(sctx, p); | |
2362 | return ret; | |
2363 | } | |
2364 | ||
2365 | struct recorded_ref { | |
2366 | struct list_head list; | |
2367 | char *dir_path; | |
2368 | char *name; | |
2369 | struct fs_path *full_path; | |
2370 | u64 dir; | |
2371 | u64 dir_gen; | |
2372 | int dir_path_len; | |
2373 | int name_len; | |
2374 | }; | |
2375 | ||
2376 | /* | |
2377 | * We need to process new refs before deleted refs, but compare_tree gives us | |
2378 | * everything mixed. So we first record all refs and later process them. | |
2379 | * This function is a helper to record one ref. | |
2380 | */ | |
2381 | static int record_ref(struct list_head *head, u64 dir, | |
2382 | u64 dir_gen, struct fs_path *path) | |
2383 | { | |
2384 | struct recorded_ref *ref; | |
2385 | char *tmp; | |
2386 | ||
2387 | ref = kmalloc(sizeof(*ref), GFP_NOFS); | |
2388 | if (!ref) | |
2389 | return -ENOMEM; | |
2390 | ||
2391 | ref->dir = dir; | |
2392 | ref->dir_gen = dir_gen; | |
2393 | ref->full_path = path; | |
2394 | ||
2395 | tmp = strrchr(ref->full_path->start, '/'); | |
2396 | if (!tmp) { | |
2397 | ref->name_len = ref->full_path->end - ref->full_path->start; | |
2398 | ref->name = ref->full_path->start; | |
2399 | ref->dir_path_len = 0; | |
2400 | ref->dir_path = ref->full_path->start; | |
2401 | } else { | |
2402 | tmp++; | |
2403 | ref->name_len = ref->full_path->end - tmp; | |
2404 | ref->name = tmp; | |
2405 | ref->dir_path = ref->full_path->start; | |
2406 | ref->dir_path_len = ref->full_path->end - | |
2407 | ref->full_path->start - 1 - ref->name_len; | |
2408 | } | |
2409 | ||
2410 | list_add_tail(&ref->list, head); | |
2411 | return 0; | |
2412 | } | |
2413 | ||
2414 | static void __free_recorded_refs(struct send_ctx *sctx, struct list_head *head) | |
2415 | { | |
2416 | struct recorded_ref *cur; | |
2417 | struct recorded_ref *tmp; | |
2418 | ||
2419 | list_for_each_entry_safe(cur, tmp, head, list) { | |
2420 | fs_path_free(sctx, cur->full_path); | |
2421 | kfree(cur); | |
2422 | } | |
2423 | INIT_LIST_HEAD(head); | |
2424 | } | |
2425 | ||
2426 | static void free_recorded_refs(struct send_ctx *sctx) | |
2427 | { | |
2428 | __free_recorded_refs(sctx, &sctx->new_refs); | |
2429 | __free_recorded_refs(sctx, &sctx->deleted_refs); | |
2430 | } | |
2431 | ||
2432 | /* | |
2433 | * Renames/moves a file/dir to it's orphan name. Used when the first | |
2434 | * ref of an unprocessed inode gets overwritten and for all non empty | |
2435 | * directories. | |
2436 | */ | |
2437 | static int orphanize_inode(struct send_ctx *sctx, u64 ino, u64 gen, | |
2438 | struct fs_path *path) | |
2439 | { | |
2440 | int ret; | |
2441 | struct fs_path *orphan; | |
2442 | ||
2443 | orphan = fs_path_alloc(sctx); | |
2444 | if (!orphan) | |
2445 | return -ENOMEM; | |
2446 | ||
2447 | ret = gen_unique_name(sctx, ino, gen, orphan); | |
2448 | if (ret < 0) | |
2449 | goto out; | |
2450 | ||
2451 | ret = send_rename(sctx, path, orphan); | |
2452 | ||
2453 | out: | |
2454 | fs_path_free(sctx, orphan); | |
2455 | return ret; | |
2456 | } | |
2457 | ||
2458 | /* | |
2459 | * Returns 1 if a directory can be removed at this point in time. | |
2460 | * We check this by iterating all dir items and checking if the inode behind | |
2461 | * the dir item was already processed. | |
2462 | */ | |
2463 | static int can_rmdir(struct send_ctx *sctx, u64 dir, u64 send_progress) | |
2464 | { | |
2465 | int ret = 0; | |
2466 | struct btrfs_root *root = sctx->parent_root; | |
2467 | struct btrfs_path *path; | |
2468 | struct btrfs_key key; | |
2469 | struct btrfs_key found_key; | |
2470 | struct btrfs_key loc; | |
2471 | struct btrfs_dir_item *di; | |
2472 | ||
2473 | path = alloc_path_for_send(); | |
2474 | if (!path) | |
2475 | return -ENOMEM; | |
2476 | ||
2477 | key.objectid = dir; | |
2478 | key.type = BTRFS_DIR_INDEX_KEY; | |
2479 | key.offset = 0; | |
2480 | ||
2481 | while (1) { | |
2482 | ret = btrfs_search_slot_for_read(root, &key, path, 1, 0); | |
2483 | if (ret < 0) | |
2484 | goto out; | |
2485 | if (!ret) { | |
2486 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
2487 | path->slots[0]); | |
2488 | } | |
2489 | if (ret || found_key.objectid != key.objectid || | |
2490 | found_key.type != key.type) { | |
2491 | break; | |
2492 | } | |
2493 | ||
2494 | di = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
2495 | struct btrfs_dir_item); | |
2496 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &loc); | |
2497 | ||
2498 | if (loc.objectid > send_progress) { | |
2499 | ret = 0; | |
2500 | goto out; | |
2501 | } | |
2502 | ||
2503 | btrfs_release_path(path); | |
2504 | key.offset = found_key.offset + 1; | |
2505 | } | |
2506 | ||
2507 | ret = 1; | |
2508 | ||
2509 | out: | |
2510 | btrfs_free_path(path); | |
2511 | return ret; | |
2512 | } | |
2513 | ||
2514 | struct finish_unordered_dir_ctx { | |
2515 | struct send_ctx *sctx; | |
2516 | struct fs_path *cur_path; | |
2517 | struct fs_path *dir_path; | |
2518 | u64 dir_ino; | |
2519 | int need_delete; | |
2520 | int delete_pass; | |
2521 | }; | |
2522 | ||
2523 | int __finish_unordered_dir(int num, struct btrfs_key *di_key, | |
2524 | const char *name, int name_len, | |
2525 | const char *data, int data_len, | |
2526 | u8 type, void *ctx) | |
2527 | { | |
2528 | int ret = 0; | |
2529 | struct finish_unordered_dir_ctx *fctx = ctx; | |
2530 | struct send_ctx *sctx = fctx->sctx; | |
2531 | u64 di_gen; | |
2532 | u64 di_mode; | |
2533 | int is_orphan = 0; | |
2534 | ||
2535 | if (di_key->objectid >= fctx->dir_ino) | |
2536 | goto out; | |
2537 | ||
2538 | fs_path_reset(fctx->cur_path); | |
2539 | ||
2540 | ret = get_inode_info(sctx->send_root, di_key->objectid, | |
2541 | NULL, &di_gen, &di_mode, NULL, NULL); | |
2542 | if (ret < 0) | |
2543 | goto out; | |
2544 | ||
2545 | ret = is_first_ref(sctx, sctx->send_root, di_key->objectid, | |
2546 | fctx->dir_ino, name, name_len); | |
2547 | if (ret < 0) | |
2548 | goto out; | |
2549 | if (ret) { | |
2550 | is_orphan = 1; | |
2551 | ret = gen_unique_name(sctx, di_key->objectid, di_gen, | |
2552 | fctx->cur_path); | |
2553 | } else { | |
2554 | ret = get_cur_path(sctx, di_key->objectid, di_gen, | |
2555 | fctx->cur_path); | |
2556 | } | |
2557 | if (ret < 0) | |
2558 | goto out; | |
2559 | ||
2560 | ret = fs_path_add(fctx->dir_path, name, name_len); | |
2561 | if (ret < 0) | |
2562 | goto out; | |
2563 | ||
2564 | if (!fctx->delete_pass) { | |
2565 | if (S_ISDIR(di_mode)) { | |
2566 | ret = send_rename(sctx, fctx->cur_path, | |
2567 | fctx->dir_path); | |
2568 | } else { | |
2569 | ret = send_link(sctx, fctx->dir_path, | |
2570 | fctx->cur_path); | |
2571 | if (is_orphan) | |
2572 | fctx->need_delete = 1; | |
2573 | } | |
2574 | } else if (!S_ISDIR(di_mode)) { | |
2575 | ret = send_unlink(sctx, fctx->cur_path); | |
2576 | } else { | |
2577 | ret = 0; | |
2578 | } | |
2579 | ||
2580 | fs_path_remove(fctx->dir_path); | |
2581 | ||
2582 | out: | |
2583 | return ret; | |
2584 | } | |
2585 | ||
2586 | /* | |
2587 | * Go through all dir items and see if we find refs which could not be created | |
2588 | * in the past because the dir did not exist at that time. | |
2589 | */ | |
2590 | static int finish_outoforder_dir(struct send_ctx *sctx, u64 dir, u64 dir_gen) | |
2591 | { | |
2592 | int ret = 0; | |
2593 | struct btrfs_path *path = NULL; | |
2594 | struct btrfs_key key; | |
2595 | struct btrfs_key found_key; | |
2596 | struct extent_buffer *eb; | |
2597 | struct finish_unordered_dir_ctx fctx; | |
2598 | int slot; | |
2599 | ||
2600 | path = alloc_path_for_send(); | |
2601 | if (!path) { | |
2602 | ret = -ENOMEM; | |
2603 | goto out; | |
2604 | } | |
2605 | ||
2606 | memset(&fctx, 0, sizeof(fctx)); | |
2607 | fctx.sctx = sctx; | |
2608 | fctx.cur_path = fs_path_alloc(sctx); | |
2609 | fctx.dir_path = fs_path_alloc(sctx); | |
2610 | if (!fctx.cur_path || !fctx.dir_path) { | |
2611 | ret = -ENOMEM; | |
2612 | goto out; | |
2613 | } | |
2614 | fctx.dir_ino = dir; | |
2615 | ||
2616 | ret = get_cur_path(sctx, dir, dir_gen, fctx.dir_path); | |
2617 | if (ret < 0) | |
2618 | goto out; | |
2619 | ||
2620 | /* | |
2621 | * We do two passes. The first links in the new refs and the second | |
2622 | * deletes orphans if required. Deletion of orphans is not required for | |
2623 | * directory inodes, as we always have only one ref and use rename | |
2624 | * instead of link for those. | |
2625 | */ | |
2626 | ||
2627 | again: | |
2628 | key.objectid = dir; | |
2629 | key.type = BTRFS_DIR_ITEM_KEY; | |
2630 | key.offset = 0; | |
2631 | while (1) { | |
2632 | ret = btrfs_search_slot_for_read(sctx->send_root, &key, path, | |
2633 | 1, 0); | |
2634 | if (ret < 0) | |
2635 | goto out; | |
2636 | eb = path->nodes[0]; | |
2637 | slot = path->slots[0]; | |
2638 | btrfs_item_key_to_cpu(eb, &found_key, slot); | |
2639 | ||
2640 | if (found_key.objectid != key.objectid || | |
2641 | found_key.type != key.type) { | |
2642 | btrfs_release_path(path); | |
2643 | break; | |
2644 | } | |
2645 | ||
2646 | ret = iterate_dir_item(sctx, sctx->send_root, path, | |
2647 | &found_key, __finish_unordered_dir, | |
2648 | &fctx); | |
2649 | if (ret < 0) | |
2650 | goto out; | |
2651 | ||
2652 | key.offset = found_key.offset + 1; | |
2653 | btrfs_release_path(path); | |
2654 | } | |
2655 | ||
2656 | if (!fctx.delete_pass && fctx.need_delete) { | |
2657 | fctx.delete_pass = 1; | |
2658 | goto again; | |
2659 | } | |
2660 | ||
2661 | out: | |
2662 | btrfs_free_path(path); | |
2663 | fs_path_free(sctx, fctx.cur_path); | |
2664 | fs_path_free(sctx, fctx.dir_path); | |
2665 | return ret; | |
2666 | } | |
2667 | ||
2668 | /* | |
2669 | * This does all the move/link/unlink/rmdir magic. | |
2670 | */ | |
2671 | static int process_recorded_refs(struct send_ctx *sctx) | |
2672 | { | |
2673 | int ret = 0; | |
2674 | struct recorded_ref *cur; | |
2675 | struct ulist *check_dirs = NULL; | |
2676 | struct ulist_iterator uit; | |
2677 | struct ulist_node *un; | |
2678 | struct fs_path *valid_path = NULL; | |
2679 | u64 ow_inode; | |
2680 | u64 ow_gen; | |
2681 | int did_overwrite = 0; | |
2682 | int is_orphan = 0; | |
2683 | ||
2684 | verbose_printk("btrfs: process_recorded_refs %llu\n", sctx->cur_ino); | |
2685 | ||
2686 | valid_path = fs_path_alloc(sctx); | |
2687 | if (!valid_path) { | |
2688 | ret = -ENOMEM; | |
2689 | goto out; | |
2690 | } | |
2691 | ||
2692 | check_dirs = ulist_alloc(GFP_NOFS); | |
2693 | if (!check_dirs) { | |
2694 | ret = -ENOMEM; | |
2695 | goto out; | |
2696 | } | |
2697 | ||
2698 | /* | |
2699 | * First, check if the first ref of the current inode was overwritten | |
2700 | * before. If yes, we know that the current inode was already orphanized | |
2701 | * and thus use the orphan name. If not, we can use get_cur_path to | |
2702 | * get the path of the first ref as it would like while receiving at | |
2703 | * this point in time. | |
2704 | * New inodes are always orphan at the beginning, so force to use the | |
2705 | * orphan name in this case. | |
2706 | * The first ref is stored in valid_path and will be updated if it | |
2707 | * gets moved around. | |
2708 | */ | |
2709 | if (!sctx->cur_inode_new) { | |
2710 | ret = did_overwrite_first_ref(sctx, sctx->cur_ino, | |
2711 | sctx->cur_inode_gen); | |
2712 | if (ret < 0) | |
2713 | goto out; | |
2714 | if (ret) | |
2715 | did_overwrite = 1; | |
2716 | } | |
2717 | if (sctx->cur_inode_new || did_overwrite) { | |
2718 | ret = gen_unique_name(sctx, sctx->cur_ino, | |
2719 | sctx->cur_inode_gen, valid_path); | |
2720 | if (ret < 0) | |
2721 | goto out; | |
2722 | is_orphan = 1; | |
2723 | } else { | |
2724 | ret = get_cur_path(sctx, sctx->cur_ino, sctx->cur_inode_gen, | |
2725 | valid_path); | |
2726 | if (ret < 0) | |
2727 | goto out; | |
2728 | } | |
2729 | ||
2730 | list_for_each_entry(cur, &sctx->new_refs, list) { | |
2731 | /* | |
2732 | * Check if this new ref would overwrite the first ref of | |
2733 | * another unprocessed inode. If yes, orphanize the | |
2734 | * overwritten inode. If we find an overwritten ref that is | |
2735 | * not the first ref, simply unlink it. | |
2736 | */ | |
2737 | ret = will_overwrite_ref(sctx, cur->dir, cur->dir_gen, | |
2738 | cur->name, cur->name_len, | |
2739 | &ow_inode, &ow_gen); | |
2740 | if (ret < 0) | |
2741 | goto out; | |
2742 | if (ret) { | |
2743 | ret = is_first_ref(sctx, sctx->parent_root, | |
2744 | ow_inode, cur->dir, cur->name, | |
2745 | cur->name_len); | |
2746 | if (ret < 0) | |
2747 | goto out; | |
2748 | if (ret) { | |
2749 | ret = orphanize_inode(sctx, ow_inode, ow_gen, | |
2750 | cur->full_path); | |
2751 | if (ret < 0) | |
2752 | goto out; | |
2753 | } else { | |
2754 | ret = send_unlink(sctx, cur->full_path); | |
2755 | if (ret < 0) | |
2756 | goto out; | |
2757 | } | |
2758 | } | |
2759 | ||
2760 | /* | |
2761 | * link/move the ref to the new place. If we have an orphan | |
2762 | * inode, move it and update valid_path. If not, link or move | |
2763 | * it depending on the inode mode. | |
2764 | */ | |
2765 | if (is_orphan && !sctx->cur_inode_first_ref_orphan) { | |
2766 | ret = send_rename(sctx, valid_path, cur->full_path); | |
2767 | if (ret < 0) | |
2768 | goto out; | |
2769 | is_orphan = 0; | |
2770 | ret = fs_path_copy(valid_path, cur->full_path); | |
2771 | if (ret < 0) | |
2772 | goto out; | |
2773 | } else { | |
2774 | if (S_ISDIR(sctx->cur_inode_mode)) { | |
2775 | /* | |
2776 | * Dirs can't be linked, so move it. For moved | |
2777 | * dirs, we always have one new and one deleted | |
2778 | * ref. The deleted ref is ignored later. | |
2779 | */ | |
2780 | ret = send_rename(sctx, valid_path, | |
2781 | cur->full_path); | |
2782 | if (ret < 0) | |
2783 | goto out; | |
2784 | ret = fs_path_copy(valid_path, cur->full_path); | |
2785 | if (ret < 0) | |
2786 | goto out; | |
2787 | } else { | |
2788 | ret = send_link(sctx, cur->full_path, | |
2789 | valid_path); | |
2790 | if (ret < 0) | |
2791 | goto out; | |
2792 | } | |
2793 | } | |
2794 | ret = ulist_add(check_dirs, cur->dir, cur->dir_gen, | |
2795 | GFP_NOFS); | |
2796 | if (ret < 0) | |
2797 | goto out; | |
2798 | } | |
2799 | ||
2800 | if (S_ISDIR(sctx->cur_inode_mode) && sctx->cur_inode_deleted) { | |
2801 | /* | |
2802 | * Check if we can already rmdir the directory. If not, | |
2803 | * orphanize it. For every dir item inside that gets deleted | |
2804 | * later, we do this check again and rmdir it then if possible. | |
2805 | * See the use of check_dirs for more details. | |
2806 | */ | |
2807 | ret = can_rmdir(sctx, sctx->cur_ino, sctx->cur_ino); | |
2808 | if (ret < 0) | |
2809 | goto out; | |
2810 | if (ret) { | |
2811 | ret = send_rmdir(sctx, valid_path); | |
2812 | if (ret < 0) | |
2813 | goto out; | |
2814 | } else if (!is_orphan) { | |
2815 | ret = orphanize_inode(sctx, sctx->cur_ino, | |
2816 | sctx->cur_inode_gen, valid_path); | |
2817 | if (ret < 0) | |
2818 | goto out; | |
2819 | is_orphan = 1; | |
2820 | } | |
2821 | ||
2822 | list_for_each_entry(cur, &sctx->deleted_refs, list) { | |
2823 | ret = ulist_add(check_dirs, cur->dir, cur->dir_gen, | |
2824 | GFP_NOFS); | |
2825 | if (ret < 0) | |
2826 | goto out; | |
2827 | } | |
2828 | } else if (!S_ISDIR(sctx->cur_inode_mode)) { | |
2829 | /* | |
2830 | * We have a non dir inode. Go through all deleted refs and | |
2831 | * unlink them if they were not already overwritten by other | |
2832 | * inodes. | |
2833 | */ | |
2834 | list_for_each_entry(cur, &sctx->deleted_refs, list) { | |
2835 | ret = did_overwrite_ref(sctx, cur->dir, cur->dir_gen, | |
2836 | sctx->cur_ino, sctx->cur_inode_gen, | |
2837 | cur->name, cur->name_len); | |
2838 | if (ret < 0) | |
2839 | goto out; | |
2840 | if (!ret) { | |
2841 | /* | |
2842 | * In case the inode was moved to a directory | |
2843 | * that was not created yet (see | |
2844 | * __record_new_ref), we can not unlink the ref | |
2845 | * as it will be needed later when the parent | |
2846 | * directory is created, so that we can move in | |
2847 | * the inode to the new dir. | |
2848 | */ | |
2849 | if (!is_orphan && | |
2850 | sctx->cur_inode_first_ref_orphan) { | |
2851 | ret = orphanize_inode(sctx, | |
2852 | sctx->cur_ino, | |
2853 | sctx->cur_inode_gen, | |
2854 | cur->full_path); | |
2855 | if (ret < 0) | |
2856 | goto out; | |
2857 | ret = gen_unique_name(sctx, | |
2858 | sctx->cur_ino, | |
2859 | sctx->cur_inode_gen, | |
2860 | valid_path); | |
2861 | if (ret < 0) | |
2862 | goto out; | |
2863 | is_orphan = 1; | |
2864 | ||
2865 | } else { | |
2866 | ret = send_unlink(sctx, cur->full_path); | |
2867 | if (ret < 0) | |
2868 | goto out; | |
2869 | } | |
2870 | } | |
2871 | ret = ulist_add(check_dirs, cur->dir, cur->dir_gen, | |
2872 | GFP_NOFS); | |
2873 | if (ret < 0) | |
2874 | goto out; | |
2875 | } | |
2876 | ||
2877 | /* | |
2878 | * If the inode is still orphan, unlink the orphan. This may | |
2879 | * happen when a previous inode did overwrite the first ref | |
2880 | * of this inode and no new refs were added for the current | |
2881 | * inode. | |
2882 | * We can however not delete the orphan in case the inode relies | |
2883 | * in a directory that was not created yet (see | |
2884 | * __record_new_ref) | |
2885 | */ | |
2886 | if (is_orphan && !sctx->cur_inode_first_ref_orphan) { | |
2887 | ret = send_unlink(sctx, valid_path); | |
2888 | if (ret < 0) | |
2889 | goto out; | |
2890 | } | |
2891 | } | |
2892 | ||
2893 | /* | |
2894 | * We did collect all parent dirs where cur_inode was once located. We | |
2895 | * now go through all these dirs and check if they are pending for | |
2896 | * deletion and if it's finally possible to perform the rmdir now. | |
2897 | * We also update the inode stats of the parent dirs here. | |
2898 | */ | |
2899 | ULIST_ITER_INIT(&uit); | |
2900 | while ((un = ulist_next(check_dirs, &uit))) { | |
2901 | if (un->val > sctx->cur_ino) | |
2902 | continue; | |
2903 | ||
2904 | ret = get_cur_inode_state(sctx, un->val, un->aux); | |
2905 | if (ret < 0) | |
2906 | goto out; | |
2907 | ||
2908 | if (ret == inode_state_did_create || | |
2909 | ret == inode_state_no_change) { | |
2910 | /* TODO delayed utimes */ | |
2911 | ret = send_utimes(sctx, un->val, un->aux); | |
2912 | if (ret < 0) | |
2913 | goto out; | |
2914 | } else if (ret == inode_state_did_delete) { | |
2915 | ret = can_rmdir(sctx, un->val, sctx->cur_ino); | |
2916 | if (ret < 0) | |
2917 | goto out; | |
2918 | if (ret) { | |
2919 | ret = get_cur_path(sctx, un->val, un->aux, | |
2920 | valid_path); | |
2921 | if (ret < 0) | |
2922 | goto out; | |
2923 | ret = send_rmdir(sctx, valid_path); | |
2924 | if (ret < 0) | |
2925 | goto out; | |
2926 | } | |
2927 | } | |
2928 | } | |
2929 | ||
2930 | /* | |
2931 | * Current inode is now at it's new position, so we must increase | |
2932 | * send_progress | |
2933 | */ | |
2934 | sctx->send_progress = sctx->cur_ino + 1; | |
2935 | ||
2936 | /* | |
2937 | * We may have a directory here that has pending refs which could not | |
2938 | * be created before (because the dir did not exist before, see | |
2939 | * __record_new_ref). finish_outoforder_dir will link/move the pending | |
2940 | * refs. | |
2941 | */ | |
2942 | if (S_ISDIR(sctx->cur_inode_mode) && sctx->cur_inode_new) { | |
2943 | ret = finish_outoforder_dir(sctx, sctx->cur_ino, | |
2944 | sctx->cur_inode_gen); | |
2945 | if (ret < 0) | |
2946 | goto out; | |
2947 | } | |
2948 | ||
2949 | ret = 0; | |
2950 | ||
2951 | out: | |
2952 | free_recorded_refs(sctx); | |
2953 | ulist_free(check_dirs); | |
2954 | fs_path_free(sctx, valid_path); | |
2955 | return ret; | |
2956 | } | |
2957 | ||
2958 | static int __record_new_ref(int num, u64 dir, int index, | |
2959 | struct fs_path *name, | |
2960 | void *ctx) | |
2961 | { | |
2962 | int ret = 0; | |
2963 | struct send_ctx *sctx = ctx; | |
2964 | struct fs_path *p; | |
2965 | u64 gen; | |
2966 | ||
2967 | p = fs_path_alloc(sctx); | |
2968 | if (!p) | |
2969 | return -ENOMEM; | |
2970 | ||
2971 | ret = get_inode_info(sctx->send_root, dir, NULL, &gen, NULL, NULL, | |
2972 | NULL); | |
2973 | if (ret < 0) | |
2974 | goto out; | |
2975 | ||
2976 | /* | |
2977 | * The parent may be non-existent at this point in time. This happens | |
2978 | * if the ino of the parent dir is higher then the current ino. In this | |
2979 | * case, we can not process this ref until the parent dir is finally | |
2980 | * created. If we reach the parent dir later, process_recorded_refs | |
2981 | * will go through all dir items and process the refs that could not be | |
2982 | * processed before. In case this is the first ref, we set | |
2983 | * cur_inode_first_ref_orphan to 1 to inform process_recorded_refs to | |
2984 | * keep an orphan of the inode so that it later can be used for | |
2985 | * link/move | |
2986 | */ | |
2987 | ret = is_inode_existent(sctx, dir, gen); | |
2988 | if (ret < 0) | |
2989 | goto out; | |
2990 | if (!ret) { | |
2991 | ret = is_first_ref(sctx, sctx->send_root, sctx->cur_ino, dir, | |
2992 | name->start, fs_path_len(name)); | |
2993 | if (ret < 0) | |
2994 | goto out; | |
2995 | if (ret) | |
2996 | sctx->cur_inode_first_ref_orphan = 1; | |
2997 | ret = 0; | |
2998 | goto out; | |
2999 | } | |
3000 | ||
3001 | ret = get_cur_path(sctx, dir, gen, p); | |
3002 | if (ret < 0) | |
3003 | goto out; | |
3004 | ret = fs_path_add_path(p, name); | |
3005 | if (ret < 0) | |
3006 | goto out; | |
3007 | ||
3008 | ret = record_ref(&sctx->new_refs, dir, gen, p); | |
3009 | ||
3010 | out: | |
3011 | if (ret) | |
3012 | fs_path_free(sctx, p); | |
3013 | return ret; | |
3014 | } | |
3015 | ||
3016 | static int __record_deleted_ref(int num, u64 dir, int index, | |
3017 | struct fs_path *name, | |
3018 | void *ctx) | |
3019 | { | |
3020 | int ret = 0; | |
3021 | struct send_ctx *sctx = ctx; | |
3022 | struct fs_path *p; | |
3023 | u64 gen; | |
3024 | ||
3025 | p = fs_path_alloc(sctx); | |
3026 | if (!p) | |
3027 | return -ENOMEM; | |
3028 | ||
3029 | ret = get_inode_info(sctx->parent_root, dir, NULL, &gen, NULL, NULL, | |
3030 | NULL); | |
3031 | if (ret < 0) | |
3032 | goto out; | |
3033 | ||
3034 | ret = get_cur_path(sctx, dir, gen, p); | |
3035 | if (ret < 0) | |
3036 | goto out; | |
3037 | ret = fs_path_add_path(p, name); | |
3038 | if (ret < 0) | |
3039 | goto out; | |
3040 | ||
3041 | ret = record_ref(&sctx->deleted_refs, dir, gen, p); | |
3042 | ||
3043 | out: | |
3044 | if (ret) | |
3045 | fs_path_free(sctx, p); | |
3046 | return ret; | |
3047 | } | |
3048 | ||
3049 | static int record_new_ref(struct send_ctx *sctx) | |
3050 | { | |
3051 | int ret; | |
3052 | ||
3053 | ret = iterate_inode_ref(sctx, sctx->send_root, sctx->left_path, | |
3054 | sctx->cmp_key, 0, __record_new_ref, sctx); | |
3055 | if (ret < 0) | |
3056 | goto out; | |
3057 | ret = 0; | |
3058 | ||
3059 | out: | |
3060 | return ret; | |
3061 | } | |
3062 | ||
3063 | static int record_deleted_ref(struct send_ctx *sctx) | |
3064 | { | |
3065 | int ret; | |
3066 | ||
3067 | ret = iterate_inode_ref(sctx, sctx->parent_root, sctx->right_path, | |
3068 | sctx->cmp_key, 0, __record_deleted_ref, sctx); | |
3069 | if (ret < 0) | |
3070 | goto out; | |
3071 | ret = 0; | |
3072 | ||
3073 | out: | |
3074 | return ret; | |
3075 | } | |
3076 | ||
3077 | struct find_ref_ctx { | |
3078 | u64 dir; | |
3079 | struct fs_path *name; | |
3080 | int found_idx; | |
3081 | }; | |
3082 | ||
3083 | static int __find_iref(int num, u64 dir, int index, | |
3084 | struct fs_path *name, | |
3085 | void *ctx_) | |
3086 | { | |
3087 | struct find_ref_ctx *ctx = ctx_; | |
3088 | ||
3089 | if (dir == ctx->dir && fs_path_len(name) == fs_path_len(ctx->name) && | |
3090 | strncmp(name->start, ctx->name->start, fs_path_len(name)) == 0) { | |
3091 | ctx->found_idx = num; | |
3092 | return 1; | |
3093 | } | |
3094 | return 0; | |
3095 | } | |
3096 | ||
3097 | static int find_iref(struct send_ctx *sctx, | |
3098 | struct btrfs_root *root, | |
3099 | struct btrfs_path *path, | |
3100 | struct btrfs_key *key, | |
3101 | u64 dir, struct fs_path *name) | |
3102 | { | |
3103 | int ret; | |
3104 | struct find_ref_ctx ctx; | |
3105 | ||
3106 | ctx.dir = dir; | |
3107 | ctx.name = name; | |
3108 | ctx.found_idx = -1; | |
3109 | ||
3110 | ret = iterate_inode_ref(sctx, root, path, key, 0, __find_iref, &ctx); | |
3111 | if (ret < 0) | |
3112 | return ret; | |
3113 | ||
3114 | if (ctx.found_idx == -1) | |
3115 | return -ENOENT; | |
3116 | ||
3117 | return ctx.found_idx; | |
3118 | } | |
3119 | ||
3120 | static int __record_changed_new_ref(int num, u64 dir, int index, | |
3121 | struct fs_path *name, | |
3122 | void *ctx) | |
3123 | { | |
3124 | int ret; | |
3125 | struct send_ctx *sctx = ctx; | |
3126 | ||
3127 | ret = find_iref(sctx, sctx->parent_root, sctx->right_path, | |
3128 | sctx->cmp_key, dir, name); | |
3129 | if (ret == -ENOENT) | |
3130 | ret = __record_new_ref(num, dir, index, name, sctx); | |
3131 | else if (ret > 0) | |
3132 | ret = 0; | |
3133 | ||
3134 | return ret; | |
3135 | } | |
3136 | ||
3137 | static int __record_changed_deleted_ref(int num, u64 dir, int index, | |
3138 | struct fs_path *name, | |
3139 | void *ctx) | |
3140 | { | |
3141 | int ret; | |
3142 | struct send_ctx *sctx = ctx; | |
3143 | ||
3144 | ret = find_iref(sctx, sctx->send_root, sctx->left_path, sctx->cmp_key, | |
3145 | dir, name); | |
3146 | if (ret == -ENOENT) | |
3147 | ret = __record_deleted_ref(num, dir, index, name, sctx); | |
3148 | else if (ret > 0) | |
3149 | ret = 0; | |
3150 | ||
3151 | return ret; | |
3152 | } | |
3153 | ||
3154 | static int record_changed_ref(struct send_ctx *sctx) | |
3155 | { | |
3156 | int ret = 0; | |
3157 | ||
3158 | ret = iterate_inode_ref(sctx, sctx->send_root, sctx->left_path, | |
3159 | sctx->cmp_key, 0, __record_changed_new_ref, sctx); | |
3160 | if (ret < 0) | |
3161 | goto out; | |
3162 | ret = iterate_inode_ref(sctx, sctx->parent_root, sctx->right_path, | |
3163 | sctx->cmp_key, 0, __record_changed_deleted_ref, sctx); | |
3164 | if (ret < 0) | |
3165 | goto out; | |
3166 | ret = 0; | |
3167 | ||
3168 | out: | |
3169 | return ret; | |
3170 | } | |
3171 | ||
3172 | /* | |
3173 | * Record and process all refs at once. Needed when an inode changes the | |
3174 | * generation number, which means that it was deleted and recreated. | |
3175 | */ | |
3176 | static int process_all_refs(struct send_ctx *sctx, | |
3177 | enum btrfs_compare_tree_result cmd) | |
3178 | { | |
3179 | int ret; | |
3180 | struct btrfs_root *root; | |
3181 | struct btrfs_path *path; | |
3182 | struct btrfs_key key; | |
3183 | struct btrfs_key found_key; | |
3184 | struct extent_buffer *eb; | |
3185 | int slot; | |
3186 | iterate_inode_ref_t cb; | |
3187 | ||
3188 | path = alloc_path_for_send(); | |
3189 | if (!path) | |
3190 | return -ENOMEM; | |
3191 | ||
3192 | if (cmd == BTRFS_COMPARE_TREE_NEW) { | |
3193 | root = sctx->send_root; | |
3194 | cb = __record_new_ref; | |
3195 | } else if (cmd == BTRFS_COMPARE_TREE_DELETED) { | |
3196 | root = sctx->parent_root; | |
3197 | cb = __record_deleted_ref; | |
3198 | } else { | |
3199 | BUG(); | |
3200 | } | |
3201 | ||
3202 | key.objectid = sctx->cmp_key->objectid; | |
3203 | key.type = BTRFS_INODE_REF_KEY; | |
3204 | key.offset = 0; | |
3205 | while (1) { | |
3206 | ret = btrfs_search_slot_for_read(root, &key, path, 1, 0); | |
3207 | if (ret < 0) { | |
3208 | btrfs_release_path(path); | |
3209 | goto out; | |
3210 | } | |
3211 | if (ret) { | |
3212 | btrfs_release_path(path); | |
3213 | break; | |
3214 | } | |
3215 | ||
3216 | eb = path->nodes[0]; | |
3217 | slot = path->slots[0]; | |
3218 | btrfs_item_key_to_cpu(eb, &found_key, slot); | |
3219 | ||
3220 | if (found_key.objectid != key.objectid || | |
3221 | found_key.type != key.type) { | |
3222 | btrfs_release_path(path); | |
3223 | break; | |
3224 | } | |
3225 | ||
3226 | ret = iterate_inode_ref(sctx, sctx->parent_root, path, | |
3227 | &found_key, 0, cb, sctx); | |
3228 | btrfs_release_path(path); | |
3229 | if (ret < 0) | |
3230 | goto out; | |
3231 | ||
3232 | key.offset = found_key.offset + 1; | |
3233 | } | |
3234 | ||
3235 | ret = process_recorded_refs(sctx); | |
3236 | ||
3237 | out: | |
3238 | btrfs_free_path(path); | |
3239 | return ret; | |
3240 | } | |
3241 | ||
3242 | static int send_set_xattr(struct send_ctx *sctx, | |
3243 | struct fs_path *path, | |
3244 | const char *name, int name_len, | |
3245 | const char *data, int data_len) | |
3246 | { | |
3247 | int ret = 0; | |
3248 | ||
3249 | ret = begin_cmd(sctx, BTRFS_SEND_C_SET_XATTR); | |
3250 | if (ret < 0) | |
3251 | goto out; | |
3252 | ||
3253 | TLV_PUT_PATH(sctx, BTRFS_SEND_A_PATH, path); | |
3254 | TLV_PUT_STRING(sctx, BTRFS_SEND_A_XATTR_NAME, name, name_len); | |
3255 | TLV_PUT(sctx, BTRFS_SEND_A_XATTR_DATA, data, data_len); | |
3256 | ||
3257 | ret = send_cmd(sctx); | |
3258 | ||
3259 | tlv_put_failure: | |
3260 | out: | |
3261 | return ret; | |
3262 | } | |
3263 | ||
3264 | static int send_remove_xattr(struct send_ctx *sctx, | |
3265 | struct fs_path *path, | |
3266 | const char *name, int name_len) | |
3267 | { | |
3268 | int ret = 0; | |
3269 | ||
3270 | ret = begin_cmd(sctx, BTRFS_SEND_C_REMOVE_XATTR); | |
3271 | if (ret < 0) | |
3272 | goto out; | |
3273 | ||
3274 | TLV_PUT_PATH(sctx, BTRFS_SEND_A_PATH, path); | |
3275 | TLV_PUT_STRING(sctx, BTRFS_SEND_A_XATTR_NAME, name, name_len); | |
3276 | ||
3277 | ret = send_cmd(sctx); | |
3278 | ||
3279 | tlv_put_failure: | |
3280 | out: | |
3281 | return ret; | |
3282 | } | |
3283 | ||
3284 | static int __process_new_xattr(int num, struct btrfs_key *di_key, | |
3285 | const char *name, int name_len, | |
3286 | const char *data, int data_len, | |
3287 | u8 type, void *ctx) | |
3288 | { | |
3289 | int ret; | |
3290 | struct send_ctx *sctx = ctx; | |
3291 | struct fs_path *p; | |
3292 | posix_acl_xattr_header dummy_acl; | |
3293 | ||
3294 | p = fs_path_alloc(sctx); | |
3295 | if (!p) | |
3296 | return -ENOMEM; | |
3297 | ||
3298 | /* | |
3299 | * This hack is needed because empty acl's are stored as zero byte | |
3300 | * data in xattrs. Problem with that is, that receiving these zero byte | |
3301 | * acl's will fail later. To fix this, we send a dummy acl list that | |
3302 | * only contains the version number and no entries. | |
3303 | */ | |
3304 | if (!strncmp(name, XATTR_NAME_POSIX_ACL_ACCESS, name_len) || | |
3305 | !strncmp(name, XATTR_NAME_POSIX_ACL_DEFAULT, name_len)) { | |
3306 | if (data_len == 0) { | |
3307 | dummy_acl.a_version = | |
3308 | cpu_to_le32(POSIX_ACL_XATTR_VERSION); | |
3309 | data = (char *)&dummy_acl; | |
3310 | data_len = sizeof(dummy_acl); | |
3311 | } | |
3312 | } | |
3313 | ||
3314 | ret = get_cur_path(sctx, sctx->cur_ino, sctx->cur_inode_gen, p); | |
3315 | if (ret < 0) | |
3316 | goto out; | |
3317 | ||
3318 | ret = send_set_xattr(sctx, p, name, name_len, data, data_len); | |
3319 | ||
3320 | out: | |
3321 | fs_path_free(sctx, p); | |
3322 | return ret; | |
3323 | } | |
3324 | ||
3325 | static int __process_deleted_xattr(int num, struct btrfs_key *di_key, | |
3326 | const char *name, int name_len, | |
3327 | const char *data, int data_len, | |
3328 | u8 type, void *ctx) | |
3329 | { | |
3330 | int ret; | |
3331 | struct send_ctx *sctx = ctx; | |
3332 | struct fs_path *p; | |
3333 | ||
3334 | p = fs_path_alloc(sctx); | |
3335 | if (!p) | |
3336 | return -ENOMEM; | |
3337 | ||
3338 | ret = get_cur_path(sctx, sctx->cur_ino, sctx->cur_inode_gen, p); | |
3339 | if (ret < 0) | |
3340 | goto out; | |
3341 | ||
3342 | ret = send_remove_xattr(sctx, p, name, name_len); | |
3343 | ||
3344 | out: | |
3345 | fs_path_free(sctx, p); | |
3346 | return ret; | |
3347 | } | |
3348 | ||
3349 | static int process_new_xattr(struct send_ctx *sctx) | |
3350 | { | |
3351 | int ret = 0; | |
3352 | ||
3353 | ret = iterate_dir_item(sctx, sctx->send_root, sctx->left_path, | |
3354 | sctx->cmp_key, __process_new_xattr, sctx); | |
3355 | ||
3356 | return ret; | |
3357 | } | |
3358 | ||
3359 | static int process_deleted_xattr(struct send_ctx *sctx) | |
3360 | { | |
3361 | int ret; | |
3362 | ||
3363 | ret = iterate_dir_item(sctx, sctx->parent_root, sctx->right_path, | |
3364 | sctx->cmp_key, __process_deleted_xattr, sctx); | |
3365 | ||
3366 | return ret; | |
3367 | } | |
3368 | ||
3369 | struct find_xattr_ctx { | |
3370 | const char *name; | |
3371 | int name_len; | |
3372 | int found_idx; | |
3373 | char *found_data; | |
3374 | int found_data_len; | |
3375 | }; | |
3376 | ||
3377 | static int __find_xattr(int num, struct btrfs_key *di_key, | |
3378 | const char *name, int name_len, | |
3379 | const char *data, int data_len, | |
3380 | u8 type, void *vctx) | |
3381 | { | |
3382 | struct find_xattr_ctx *ctx = vctx; | |
3383 | ||
3384 | if (name_len == ctx->name_len && | |
3385 | strncmp(name, ctx->name, name_len) == 0) { | |
3386 | ctx->found_idx = num; | |
3387 | ctx->found_data_len = data_len; | |
3388 | ctx->found_data = kmalloc(data_len, GFP_NOFS); | |
3389 | if (!ctx->found_data) | |
3390 | return -ENOMEM; | |
3391 | memcpy(ctx->found_data, data, data_len); | |
3392 | return 1; | |
3393 | } | |
3394 | return 0; | |
3395 | } | |
3396 | ||
3397 | static int find_xattr(struct send_ctx *sctx, | |
3398 | struct btrfs_root *root, | |
3399 | struct btrfs_path *path, | |
3400 | struct btrfs_key *key, | |
3401 | const char *name, int name_len, | |
3402 | char **data, int *data_len) | |
3403 | { | |
3404 | int ret; | |
3405 | struct find_xattr_ctx ctx; | |
3406 | ||
3407 | ctx.name = name; | |
3408 | ctx.name_len = name_len; | |
3409 | ctx.found_idx = -1; | |
3410 | ctx.found_data = NULL; | |
3411 | ctx.found_data_len = 0; | |
3412 | ||
3413 | ret = iterate_dir_item(sctx, root, path, key, __find_xattr, &ctx); | |
3414 | if (ret < 0) | |
3415 | return ret; | |
3416 | ||
3417 | if (ctx.found_idx == -1) | |
3418 | return -ENOENT; | |
3419 | if (data) { | |
3420 | *data = ctx.found_data; | |
3421 | *data_len = ctx.found_data_len; | |
3422 | } else { | |
3423 | kfree(ctx.found_data); | |
3424 | } | |
3425 | return ctx.found_idx; | |
3426 | } | |
3427 | ||
3428 | ||
3429 | static int __process_changed_new_xattr(int num, struct btrfs_key *di_key, | |
3430 | const char *name, int name_len, | |
3431 | const char *data, int data_len, | |
3432 | u8 type, void *ctx) | |
3433 | { | |
3434 | int ret; | |
3435 | struct send_ctx *sctx = ctx; | |
3436 | char *found_data = NULL; | |
3437 | int found_data_len = 0; | |
3438 | struct fs_path *p = NULL; | |
3439 | ||
3440 | ret = find_xattr(sctx, sctx->parent_root, sctx->right_path, | |
3441 | sctx->cmp_key, name, name_len, &found_data, | |
3442 | &found_data_len); | |
3443 | if (ret == -ENOENT) { | |
3444 | ret = __process_new_xattr(num, di_key, name, name_len, data, | |
3445 | data_len, type, ctx); | |
3446 | } else if (ret >= 0) { | |
3447 | if (data_len != found_data_len || | |
3448 | memcmp(data, found_data, data_len)) { | |
3449 | ret = __process_new_xattr(num, di_key, name, name_len, | |
3450 | data, data_len, type, ctx); | |
3451 | } else { | |
3452 | ret = 0; | |
3453 | } | |
3454 | } | |
3455 | ||
3456 | kfree(found_data); | |
3457 | fs_path_free(sctx, p); | |
3458 | return ret; | |
3459 | } | |
3460 | ||
3461 | static int __process_changed_deleted_xattr(int num, struct btrfs_key *di_key, | |
3462 | const char *name, int name_len, | |
3463 | const char *data, int data_len, | |
3464 | u8 type, void *ctx) | |
3465 | { | |
3466 | int ret; | |
3467 | struct send_ctx *sctx = ctx; | |
3468 | ||
3469 | ret = find_xattr(sctx, sctx->send_root, sctx->left_path, sctx->cmp_key, | |
3470 | name, name_len, NULL, NULL); | |
3471 | if (ret == -ENOENT) | |
3472 | ret = __process_deleted_xattr(num, di_key, name, name_len, data, | |
3473 | data_len, type, ctx); | |
3474 | else if (ret >= 0) | |
3475 | ret = 0; | |
3476 | ||
3477 | return ret; | |
3478 | } | |
3479 | ||
3480 | static int process_changed_xattr(struct send_ctx *sctx) | |
3481 | { | |
3482 | int ret = 0; | |
3483 | ||
3484 | ret = iterate_dir_item(sctx, sctx->send_root, sctx->left_path, | |
3485 | sctx->cmp_key, __process_changed_new_xattr, sctx); | |
3486 | if (ret < 0) | |
3487 | goto out; | |
3488 | ret = iterate_dir_item(sctx, sctx->parent_root, sctx->right_path, | |
3489 | sctx->cmp_key, __process_changed_deleted_xattr, sctx); | |
3490 | ||
3491 | out: | |
3492 | return ret; | |
3493 | } | |
3494 | ||
3495 | static int process_all_new_xattrs(struct send_ctx *sctx) | |
3496 | { | |
3497 | int ret; | |
3498 | struct btrfs_root *root; | |
3499 | struct btrfs_path *path; | |
3500 | struct btrfs_key key; | |
3501 | struct btrfs_key found_key; | |
3502 | struct extent_buffer *eb; | |
3503 | int slot; | |
3504 | ||
3505 | path = alloc_path_for_send(); | |
3506 | if (!path) | |
3507 | return -ENOMEM; | |
3508 | ||
3509 | root = sctx->send_root; | |
3510 | ||
3511 | key.objectid = sctx->cmp_key->objectid; | |
3512 | key.type = BTRFS_XATTR_ITEM_KEY; | |
3513 | key.offset = 0; | |
3514 | while (1) { | |
3515 | ret = btrfs_search_slot_for_read(root, &key, path, 1, 0); | |
3516 | if (ret < 0) | |
3517 | goto out; | |
3518 | if (ret) { | |
3519 | ret = 0; | |
3520 | goto out; | |
3521 | } | |
3522 | ||
3523 | eb = path->nodes[0]; | |
3524 | slot = path->slots[0]; | |
3525 | btrfs_item_key_to_cpu(eb, &found_key, slot); | |
3526 | ||
3527 | if (found_key.objectid != key.objectid || | |
3528 | found_key.type != key.type) { | |
3529 | ret = 0; | |
3530 | goto out; | |
3531 | } | |
3532 | ||
3533 | ret = iterate_dir_item(sctx, root, path, &found_key, | |
3534 | __process_new_xattr, sctx); | |
3535 | if (ret < 0) | |
3536 | goto out; | |
3537 | ||
3538 | btrfs_release_path(path); | |
3539 | key.offset = found_key.offset + 1; | |
3540 | } | |
3541 | ||
3542 | out: | |
3543 | btrfs_free_path(path); | |
3544 | return ret; | |
3545 | } | |
3546 | ||
3547 | /* | |
3548 | * Read some bytes from the current inode/file and send a write command to | |
3549 | * user space. | |
3550 | */ | |
3551 | static int send_write(struct send_ctx *sctx, u64 offset, u32 len) | |
3552 | { | |
3553 | int ret = 0; | |
3554 | struct fs_path *p; | |
3555 | loff_t pos = offset; | |
3556 | int readed; | |
3557 | mm_segment_t old_fs; | |
3558 | ||
3559 | p = fs_path_alloc(sctx); | |
3560 | if (!p) | |
3561 | return -ENOMEM; | |
3562 | ||
3563 | /* | |
3564 | * vfs normally only accepts user space buffers for security reasons. | |
3565 | * we only read from the file and also only provide the read_buf buffer | |
3566 | * to vfs. As this buffer does not come from a user space call, it's | |
3567 | * ok to temporary allow kernel space buffers. | |
3568 | */ | |
3569 | old_fs = get_fs(); | |
3570 | set_fs(KERNEL_DS); | |
3571 | ||
3572 | verbose_printk("btrfs: send_write offset=%llu, len=%d\n", offset, len); | |
3573 | ||
3574 | ret = open_cur_inode_file(sctx); | |
3575 | if (ret < 0) | |
3576 | goto out; | |
3577 | ||
3578 | ret = vfs_read(sctx->cur_inode_filp, sctx->read_buf, len, &pos); | |
3579 | if (ret < 0) | |
3580 | goto out; | |
3581 | readed = ret; | |
3582 | if (!readed) | |
3583 | goto out; | |
3584 | ||
3585 | ret = begin_cmd(sctx, BTRFS_SEND_C_WRITE); | |
3586 | if (ret < 0) | |
3587 | goto out; | |
3588 | ||
3589 | ret = get_cur_path(sctx, sctx->cur_ino, sctx->cur_inode_gen, p); | |
3590 | if (ret < 0) | |
3591 | goto out; | |
3592 | ||
3593 | TLV_PUT_PATH(sctx, BTRFS_SEND_A_PATH, p); | |
3594 | TLV_PUT_U64(sctx, BTRFS_SEND_A_FILE_OFFSET, offset); | |
3595 | TLV_PUT(sctx, BTRFS_SEND_A_DATA, sctx->read_buf, readed); | |
3596 | ||
3597 | ret = send_cmd(sctx); | |
3598 | ||
3599 | tlv_put_failure: | |
3600 | out: | |
3601 | fs_path_free(sctx, p); | |
3602 | set_fs(old_fs); | |
3603 | if (ret < 0) | |
3604 | return ret; | |
3605 | return readed; | |
3606 | } | |
3607 | ||
3608 | /* | |
3609 | * Send a clone command to user space. | |
3610 | */ | |
3611 | static int send_clone(struct send_ctx *sctx, | |
3612 | u64 offset, u32 len, | |
3613 | struct clone_root *clone_root) | |
3614 | { | |
3615 | int ret = 0; | |
3616 | struct btrfs_root *clone_root2 = clone_root->root; | |
3617 | struct fs_path *p; | |
3618 | u64 gen; | |
3619 | ||
3620 | verbose_printk("btrfs: send_clone offset=%llu, len=%d, clone_root=%llu, " | |
3621 | "clone_inode=%llu, clone_offset=%llu\n", offset, len, | |
3622 | clone_root->root->objectid, clone_root->ino, | |
3623 | clone_root->offset); | |
3624 | ||
3625 | p = fs_path_alloc(sctx); | |
3626 | if (!p) | |
3627 | return -ENOMEM; | |
3628 | ||
3629 | ret = begin_cmd(sctx, BTRFS_SEND_C_CLONE); | |
3630 | if (ret < 0) | |
3631 | goto out; | |
3632 | ||
3633 | ret = get_cur_path(sctx, sctx->cur_ino, sctx->cur_inode_gen, p); | |
3634 | if (ret < 0) | |
3635 | goto out; | |
3636 | ||
3637 | TLV_PUT_U64(sctx, BTRFS_SEND_A_FILE_OFFSET, offset); | |
3638 | TLV_PUT_U64(sctx, BTRFS_SEND_A_CLONE_LEN, len); | |
3639 | TLV_PUT_PATH(sctx, BTRFS_SEND_A_PATH, p); | |
3640 | ||
3641 | if (clone_root2 == sctx->send_root) { | |
3642 | ret = get_inode_info(sctx->send_root, clone_root->ino, NULL, | |
3643 | &gen, NULL, NULL, NULL); | |
3644 | if (ret < 0) | |
3645 | goto out; | |
3646 | ret = get_cur_path(sctx, clone_root->ino, gen, p); | |
3647 | } else { | |
3648 | ret = get_inode_path(sctx, clone_root2, clone_root->ino, p); | |
3649 | } | |
3650 | if (ret < 0) | |
3651 | goto out; | |
3652 | ||
3653 | TLV_PUT_UUID(sctx, BTRFS_SEND_A_CLONE_UUID, | |
3654 | clone_root2->root_item.uuid); | |
3655 | TLV_PUT_U64(sctx, BTRFS_SEND_A_CLONE_CTRANSID, | |
3656 | clone_root2->root_item.ctransid); | |
3657 | TLV_PUT_PATH(sctx, BTRFS_SEND_A_CLONE_PATH, p); | |
3658 | TLV_PUT_U64(sctx, BTRFS_SEND_A_CLONE_OFFSET, | |
3659 | clone_root->offset); | |
3660 | ||
3661 | ret = send_cmd(sctx); | |
3662 | ||
3663 | tlv_put_failure: | |
3664 | out: | |
3665 | fs_path_free(sctx, p); | |
3666 | return ret; | |
3667 | } | |
3668 | ||
3669 | static int send_write_or_clone(struct send_ctx *sctx, | |
3670 | struct btrfs_path *path, | |
3671 | struct btrfs_key *key, | |
3672 | struct clone_root *clone_root) | |
3673 | { | |
3674 | int ret = 0; | |
3675 | struct btrfs_file_extent_item *ei; | |
3676 | u64 offset = key->offset; | |
3677 | u64 pos = 0; | |
3678 | u64 len; | |
3679 | u32 l; | |
3680 | u8 type; | |
3681 | ||
3682 | ei = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
3683 | struct btrfs_file_extent_item); | |
3684 | type = btrfs_file_extent_type(path->nodes[0], ei); | |
3685 | if (type == BTRFS_FILE_EXTENT_INLINE) | |
3686 | len = btrfs_file_extent_inline_len(path->nodes[0], ei); | |
3687 | else | |
3688 | len = btrfs_file_extent_num_bytes(path->nodes[0], ei); | |
3689 | ||
3690 | if (offset + len > sctx->cur_inode_size) | |
3691 | len = sctx->cur_inode_size - offset; | |
3692 | if (len == 0) { | |
3693 | ret = 0; | |
3694 | goto out; | |
3695 | } | |
3696 | ||
3697 | if (!clone_root) { | |
3698 | while (pos < len) { | |
3699 | l = len - pos; | |
3700 | if (l > BTRFS_SEND_READ_SIZE) | |
3701 | l = BTRFS_SEND_READ_SIZE; | |
3702 | ret = send_write(sctx, pos + offset, l); | |
3703 | if (ret < 0) | |
3704 | goto out; | |
3705 | if (!ret) | |
3706 | break; | |
3707 | pos += ret; | |
3708 | } | |
3709 | ret = 0; | |
3710 | } else { | |
3711 | ret = send_clone(sctx, offset, len, clone_root); | |
3712 | } | |
3713 | ||
3714 | out: | |
3715 | return ret; | |
3716 | } | |
3717 | ||
3718 | static int is_extent_unchanged(struct send_ctx *sctx, | |
3719 | struct btrfs_path *left_path, | |
3720 | struct btrfs_key *ekey) | |
3721 | { | |
3722 | int ret = 0; | |
3723 | struct btrfs_key key; | |
3724 | struct btrfs_path *path = NULL; | |
3725 | struct extent_buffer *eb; | |
3726 | int slot; | |
3727 | struct btrfs_key found_key; | |
3728 | struct btrfs_file_extent_item *ei; | |
3729 | u64 left_disknr; | |
3730 | u64 right_disknr; | |
3731 | u64 left_offset; | |
3732 | u64 right_offset; | |
3733 | u64 left_offset_fixed; | |
3734 | u64 left_len; | |
3735 | u64 right_len; | |
3736 | u8 left_type; | |
3737 | u8 right_type; | |
3738 | ||
3739 | path = alloc_path_for_send(); | |
3740 | if (!path) | |
3741 | return -ENOMEM; | |
3742 | ||
3743 | eb = left_path->nodes[0]; | |
3744 | slot = left_path->slots[0]; | |
3745 | ||
3746 | ei = btrfs_item_ptr(eb, slot, struct btrfs_file_extent_item); | |
3747 | left_type = btrfs_file_extent_type(eb, ei); | |
3748 | left_disknr = btrfs_file_extent_disk_bytenr(eb, ei); | |
3749 | left_len = btrfs_file_extent_num_bytes(eb, ei); | |
3750 | left_offset = btrfs_file_extent_offset(eb, ei); | |
3751 | ||
3752 | if (left_type != BTRFS_FILE_EXTENT_REG) { | |
3753 | ret = 0; | |
3754 | goto out; | |
3755 | } | |
3756 | ||
3757 | /* | |
3758 | * Following comments will refer to these graphics. L is the left | |
3759 | * extents which we are checking at the moment. 1-8 are the right | |
3760 | * extents that we iterate. | |
3761 | * | |
3762 | * |-----L-----| | |
3763 | * |-1-|-2a-|-3-|-4-|-5-|-6-| | |
3764 | * | |
3765 | * |-----L-----| | |
3766 | * |--1--|-2b-|...(same as above) | |
3767 | * | |
3768 | * Alternative situation. Happens on files where extents got split. | |
3769 | * |-----L-----| | |
3770 | * |-----------7-----------|-6-| | |
3771 | * | |
3772 | * Alternative situation. Happens on files which got larger. | |
3773 | * |-----L-----| | |
3774 | * |-8-| | |
3775 | * Nothing follows after 8. | |
3776 | */ | |
3777 | ||
3778 | key.objectid = ekey->objectid; | |
3779 | key.type = BTRFS_EXTENT_DATA_KEY; | |
3780 | key.offset = ekey->offset; | |
3781 | ret = btrfs_search_slot_for_read(sctx->parent_root, &key, path, 0, 0); | |
3782 | if (ret < 0) | |
3783 | goto out; | |
3784 | if (ret) { | |
3785 | ret = 0; | |
3786 | goto out; | |
3787 | } | |
3788 | ||
3789 | /* | |
3790 | * Handle special case where the right side has no extents at all. | |
3791 | */ | |
3792 | eb = path->nodes[0]; | |
3793 | slot = path->slots[0]; | |
3794 | btrfs_item_key_to_cpu(eb, &found_key, slot); | |
3795 | if (found_key.objectid != key.objectid || | |
3796 | found_key.type != key.type) { | |
3797 | ret = 0; | |
3798 | goto out; | |
3799 | } | |
3800 | ||
3801 | /* | |
3802 | * We're now on 2a, 2b or 7. | |
3803 | */ | |
3804 | key = found_key; | |
3805 | while (key.offset < ekey->offset + left_len) { | |
3806 | ei = btrfs_item_ptr(eb, slot, struct btrfs_file_extent_item); | |
3807 | right_type = btrfs_file_extent_type(eb, ei); | |
3808 | right_disknr = btrfs_file_extent_disk_bytenr(eb, ei); | |
3809 | right_len = btrfs_file_extent_num_bytes(eb, ei); | |
3810 | right_offset = btrfs_file_extent_offset(eb, ei); | |
3811 | ||
3812 | if (right_type != BTRFS_FILE_EXTENT_REG) { | |
3813 | ret = 0; | |
3814 | goto out; | |
3815 | } | |
3816 | ||
3817 | /* | |
3818 | * Are we at extent 8? If yes, we know the extent is changed. | |
3819 | * This may only happen on the first iteration. | |
3820 | */ | |
3821 | if (found_key.offset + right_len < ekey->offset) { | |
3822 | ret = 0; | |
3823 | goto out; | |
3824 | } | |
3825 | ||
3826 | left_offset_fixed = left_offset; | |
3827 | if (key.offset < ekey->offset) { | |
3828 | /* Fix the right offset for 2a and 7. */ | |
3829 | right_offset += ekey->offset - key.offset; | |
3830 | } else { | |
3831 | /* Fix the left offset for all behind 2a and 2b */ | |
3832 | left_offset_fixed += key.offset - ekey->offset; | |
3833 | } | |
3834 | ||
3835 | /* | |
3836 | * Check if we have the same extent. | |
3837 | */ | |
3838 | if (left_disknr + left_offset_fixed != | |
3839 | right_disknr + right_offset) { | |
3840 | ret = 0; | |
3841 | goto out; | |
3842 | } | |
3843 | ||
3844 | /* | |
3845 | * Go to the next extent. | |
3846 | */ | |
3847 | ret = btrfs_next_item(sctx->parent_root, path); | |
3848 | if (ret < 0) | |
3849 | goto out; | |
3850 | if (!ret) { | |
3851 | eb = path->nodes[0]; | |
3852 | slot = path->slots[0]; | |
3853 | btrfs_item_key_to_cpu(eb, &found_key, slot); | |
3854 | } | |
3855 | if (ret || found_key.objectid != key.objectid || | |
3856 | found_key.type != key.type) { | |
3857 | key.offset += right_len; | |
3858 | break; | |
3859 | } else { | |
3860 | if (found_key.offset != key.offset + right_len) { | |
3861 | /* Should really not happen */ | |
3862 | ret = -EIO; | |
3863 | goto out; | |
3864 | } | |
3865 | } | |
3866 | key = found_key; | |
3867 | } | |
3868 | ||
3869 | /* | |
3870 | * We're now behind the left extent (treat as unchanged) or at the end | |
3871 | * of the right side (treat as changed). | |
3872 | */ | |
3873 | if (key.offset >= ekey->offset + left_len) | |
3874 | ret = 1; | |
3875 | else | |
3876 | ret = 0; | |
3877 | ||
3878 | ||
3879 | out: | |
3880 | btrfs_free_path(path); | |
3881 | return ret; | |
3882 | } | |
3883 | ||
3884 | static int process_extent(struct send_ctx *sctx, | |
3885 | struct btrfs_path *path, | |
3886 | struct btrfs_key *key) | |
3887 | { | |
3888 | int ret = 0; | |
3889 | struct clone_root *found_clone = NULL; | |
3890 | ||
3891 | if (S_ISLNK(sctx->cur_inode_mode)) | |
3892 | return 0; | |
3893 | ||
3894 | if (sctx->parent_root && !sctx->cur_inode_new) { | |
3895 | ret = is_extent_unchanged(sctx, path, key); | |
3896 | if (ret < 0) | |
3897 | goto out; | |
3898 | if (ret) { | |
3899 | ret = 0; | |
3900 | goto out; | |
3901 | } | |
3902 | } | |
3903 | ||
3904 | ret = find_extent_clone(sctx, path, key->objectid, key->offset, | |
3905 | sctx->cur_inode_size, &found_clone); | |
3906 | if (ret != -ENOENT && ret < 0) | |
3907 | goto out; | |
3908 | ||
3909 | ret = send_write_or_clone(sctx, path, key, found_clone); | |
3910 | ||
3911 | out: | |
3912 | return ret; | |
3913 | } | |
3914 | ||
3915 | static int process_all_extents(struct send_ctx *sctx) | |
3916 | { | |
3917 | int ret; | |
3918 | struct btrfs_root *root; | |
3919 | struct btrfs_path *path; | |
3920 | struct btrfs_key key; | |
3921 | struct btrfs_key found_key; | |
3922 | struct extent_buffer *eb; | |
3923 | int slot; | |
3924 | ||
3925 | root = sctx->send_root; | |
3926 | path = alloc_path_for_send(); | |
3927 | if (!path) | |
3928 | return -ENOMEM; | |
3929 | ||
3930 | key.objectid = sctx->cmp_key->objectid; | |
3931 | key.type = BTRFS_EXTENT_DATA_KEY; | |
3932 | key.offset = 0; | |
3933 | while (1) { | |
3934 | ret = btrfs_search_slot_for_read(root, &key, path, 1, 0); | |
3935 | if (ret < 0) | |
3936 | goto out; | |
3937 | if (ret) { | |
3938 | ret = 0; | |
3939 | goto out; | |
3940 | } | |
3941 | ||
3942 | eb = path->nodes[0]; | |
3943 | slot = path->slots[0]; | |
3944 | btrfs_item_key_to_cpu(eb, &found_key, slot); | |
3945 | ||
3946 | if (found_key.objectid != key.objectid || | |
3947 | found_key.type != key.type) { | |
3948 | ret = 0; | |
3949 | goto out; | |
3950 | } | |
3951 | ||
3952 | ret = process_extent(sctx, path, &found_key); | |
3953 | if (ret < 0) | |
3954 | goto out; | |
3955 | ||
3956 | btrfs_release_path(path); | |
3957 | key.offset = found_key.offset + 1; | |
3958 | } | |
3959 | ||
3960 | out: | |
3961 | btrfs_free_path(path); | |
3962 | return ret; | |
3963 | } | |
3964 | ||
3965 | static int process_recorded_refs_if_needed(struct send_ctx *sctx, int at_end) | |
3966 | { | |
3967 | int ret = 0; | |
3968 | ||
3969 | if (sctx->cur_ino == 0) | |
3970 | goto out; | |
3971 | if (!at_end && sctx->cur_ino == sctx->cmp_key->objectid && | |
3972 | sctx->cmp_key->type <= BTRFS_INODE_REF_KEY) | |
3973 | goto out; | |
3974 | if (list_empty(&sctx->new_refs) && list_empty(&sctx->deleted_refs)) | |
3975 | goto out; | |
3976 | ||
3977 | ret = process_recorded_refs(sctx); | |
3978 | ||
3979 | out: | |
3980 | return ret; | |
3981 | } | |
3982 | ||
3983 | static int finish_inode_if_needed(struct send_ctx *sctx, int at_end) | |
3984 | { | |
3985 | int ret = 0; | |
3986 | u64 left_mode; | |
3987 | u64 left_uid; | |
3988 | u64 left_gid; | |
3989 | u64 right_mode; | |
3990 | u64 right_uid; | |
3991 | u64 right_gid; | |
3992 | int need_chmod = 0; | |
3993 | int need_chown = 0; | |
3994 | ||
3995 | ret = process_recorded_refs_if_needed(sctx, at_end); | |
3996 | if (ret < 0) | |
3997 | goto out; | |
3998 | ||
3999 | if (sctx->cur_ino == 0 || sctx->cur_inode_deleted) | |
4000 | goto out; | |
4001 | if (!at_end && sctx->cmp_key->objectid == sctx->cur_ino) | |
4002 | goto out; | |
4003 | ||
4004 | ret = get_inode_info(sctx->send_root, sctx->cur_ino, NULL, NULL, | |
4005 | &left_mode, &left_uid, &left_gid); | |
4006 | if (ret < 0) | |
4007 | goto out; | |
4008 | ||
4009 | if (!S_ISLNK(sctx->cur_inode_mode)) { | |
4010 | if (!sctx->parent_root || sctx->cur_inode_new) { | |
4011 | need_chmod = 1; | |
4012 | need_chown = 1; | |
4013 | } else { | |
4014 | ret = get_inode_info(sctx->parent_root, sctx->cur_ino, | |
4015 | NULL, NULL, &right_mode, &right_uid, | |
4016 | &right_gid); | |
4017 | if (ret < 0) | |
4018 | goto out; | |
4019 | ||
4020 | if (left_uid != right_uid || left_gid != right_gid) | |
4021 | need_chown = 1; | |
4022 | if (left_mode != right_mode) | |
4023 | need_chmod = 1; | |
4024 | } | |
4025 | } | |
4026 | ||
4027 | if (S_ISREG(sctx->cur_inode_mode)) { | |
4028 | ret = send_truncate(sctx, sctx->cur_ino, sctx->cur_inode_gen, | |
4029 | sctx->cur_inode_size); | |
4030 | if (ret < 0) | |
4031 | goto out; | |
4032 | } | |
4033 | ||
4034 | if (need_chown) { | |
4035 | ret = send_chown(sctx, sctx->cur_ino, sctx->cur_inode_gen, | |
4036 | left_uid, left_gid); | |
4037 | if (ret < 0) | |
4038 | goto out; | |
4039 | } | |
4040 | if (need_chmod) { | |
4041 | ret = send_chmod(sctx, sctx->cur_ino, sctx->cur_inode_gen, | |
4042 | left_mode); | |
4043 | if (ret < 0) | |
4044 | goto out; | |
4045 | } | |
4046 | ||
4047 | /* | |
4048 | * Need to send that every time, no matter if it actually changed | |
4049 | * between the two trees as we have done changes to the inode before. | |
4050 | */ | |
4051 | ret = send_utimes(sctx, sctx->cur_ino, sctx->cur_inode_gen); | |
4052 | if (ret < 0) | |
4053 | goto out; | |
4054 | ||
4055 | out: | |
4056 | return ret; | |
4057 | } | |
4058 | ||
4059 | static int changed_inode(struct send_ctx *sctx, | |
4060 | enum btrfs_compare_tree_result result) | |
4061 | { | |
4062 | int ret = 0; | |
4063 | struct btrfs_key *key = sctx->cmp_key; | |
4064 | struct btrfs_inode_item *left_ii = NULL; | |
4065 | struct btrfs_inode_item *right_ii = NULL; | |
4066 | u64 left_gen = 0; | |
4067 | u64 right_gen = 0; | |
4068 | ||
4069 | ret = close_cur_inode_file(sctx); | |
4070 | if (ret < 0) | |
4071 | goto out; | |
4072 | ||
4073 | sctx->cur_ino = key->objectid; | |
4074 | sctx->cur_inode_new_gen = 0; | |
4075 | sctx->cur_inode_first_ref_orphan = 0; | |
4076 | sctx->send_progress = sctx->cur_ino; | |
4077 | ||
4078 | if (result == BTRFS_COMPARE_TREE_NEW || | |
4079 | result == BTRFS_COMPARE_TREE_CHANGED) { | |
4080 | left_ii = btrfs_item_ptr(sctx->left_path->nodes[0], | |
4081 | sctx->left_path->slots[0], | |
4082 | struct btrfs_inode_item); | |
4083 | left_gen = btrfs_inode_generation(sctx->left_path->nodes[0], | |
4084 | left_ii); | |
4085 | } else { | |
4086 | right_ii = btrfs_item_ptr(sctx->right_path->nodes[0], | |
4087 | sctx->right_path->slots[0], | |
4088 | struct btrfs_inode_item); | |
4089 | right_gen = btrfs_inode_generation(sctx->right_path->nodes[0], | |
4090 | right_ii); | |
4091 | } | |
4092 | if (result == BTRFS_COMPARE_TREE_CHANGED) { | |
4093 | right_ii = btrfs_item_ptr(sctx->right_path->nodes[0], | |
4094 | sctx->right_path->slots[0], | |
4095 | struct btrfs_inode_item); | |
4096 | ||
4097 | right_gen = btrfs_inode_generation(sctx->right_path->nodes[0], | |
4098 | right_ii); | |
4099 | if (left_gen != right_gen) | |
4100 | sctx->cur_inode_new_gen = 1; | |
4101 | } | |
4102 | ||
4103 | if (result == BTRFS_COMPARE_TREE_NEW) { | |
4104 | sctx->cur_inode_gen = left_gen; | |
4105 | sctx->cur_inode_new = 1; | |
4106 | sctx->cur_inode_deleted = 0; | |
4107 | sctx->cur_inode_size = btrfs_inode_size( | |
4108 | sctx->left_path->nodes[0], left_ii); | |
4109 | sctx->cur_inode_mode = btrfs_inode_mode( | |
4110 | sctx->left_path->nodes[0], left_ii); | |
4111 | if (sctx->cur_ino != BTRFS_FIRST_FREE_OBJECTID) | |
4112 | ret = send_create_inode(sctx, sctx->left_path, | |
4113 | sctx->cmp_key); | |
4114 | } else if (result == BTRFS_COMPARE_TREE_DELETED) { | |
4115 | sctx->cur_inode_gen = right_gen; | |
4116 | sctx->cur_inode_new = 0; | |
4117 | sctx->cur_inode_deleted = 1; | |
4118 | sctx->cur_inode_size = btrfs_inode_size( | |
4119 | sctx->right_path->nodes[0], right_ii); | |
4120 | sctx->cur_inode_mode = btrfs_inode_mode( | |
4121 | sctx->right_path->nodes[0], right_ii); | |
4122 | } else if (result == BTRFS_COMPARE_TREE_CHANGED) { | |
4123 | if (sctx->cur_inode_new_gen) { | |
4124 | sctx->cur_inode_gen = right_gen; | |
4125 | sctx->cur_inode_new = 0; | |
4126 | sctx->cur_inode_deleted = 1; | |
4127 | sctx->cur_inode_size = btrfs_inode_size( | |
4128 | sctx->right_path->nodes[0], right_ii); | |
4129 | sctx->cur_inode_mode = btrfs_inode_mode( | |
4130 | sctx->right_path->nodes[0], right_ii); | |
4131 | ret = process_all_refs(sctx, | |
4132 | BTRFS_COMPARE_TREE_DELETED); | |
4133 | if (ret < 0) | |
4134 | goto out; | |
4135 | ||
4136 | sctx->cur_inode_gen = left_gen; | |
4137 | sctx->cur_inode_new = 1; | |
4138 | sctx->cur_inode_deleted = 0; | |
4139 | sctx->cur_inode_size = btrfs_inode_size( | |
4140 | sctx->left_path->nodes[0], left_ii); | |
4141 | sctx->cur_inode_mode = btrfs_inode_mode( | |
4142 | sctx->left_path->nodes[0], left_ii); | |
4143 | ret = send_create_inode(sctx, sctx->left_path, | |
4144 | sctx->cmp_key); | |
4145 | if (ret < 0) | |
4146 | goto out; | |
4147 | ||
4148 | ret = process_all_refs(sctx, BTRFS_COMPARE_TREE_NEW); | |
4149 | if (ret < 0) | |
4150 | goto out; | |
4151 | ret = process_all_extents(sctx); | |
4152 | if (ret < 0) | |
4153 | goto out; | |
4154 | ret = process_all_new_xattrs(sctx); | |
4155 | if (ret < 0) | |
4156 | goto out; | |
4157 | } else { | |
4158 | sctx->cur_inode_gen = left_gen; | |
4159 | sctx->cur_inode_new = 0; | |
4160 | sctx->cur_inode_new_gen = 0; | |
4161 | sctx->cur_inode_deleted = 0; | |
4162 | sctx->cur_inode_size = btrfs_inode_size( | |
4163 | sctx->left_path->nodes[0], left_ii); | |
4164 | sctx->cur_inode_mode = btrfs_inode_mode( | |
4165 | sctx->left_path->nodes[0], left_ii); | |
4166 | } | |
4167 | } | |
4168 | ||
4169 | out: | |
4170 | return ret; | |
4171 | } | |
4172 | ||
4173 | static int changed_ref(struct send_ctx *sctx, | |
4174 | enum btrfs_compare_tree_result result) | |
4175 | { | |
4176 | int ret = 0; | |
4177 | ||
4178 | BUG_ON(sctx->cur_ino != sctx->cmp_key->objectid); | |
4179 | ||
4180 | if (!sctx->cur_inode_new_gen && | |
4181 | sctx->cur_ino != BTRFS_FIRST_FREE_OBJECTID) { | |
4182 | if (result == BTRFS_COMPARE_TREE_NEW) | |
4183 | ret = record_new_ref(sctx); | |
4184 | else if (result == BTRFS_COMPARE_TREE_DELETED) | |
4185 | ret = record_deleted_ref(sctx); | |
4186 | else if (result == BTRFS_COMPARE_TREE_CHANGED) | |
4187 | ret = record_changed_ref(sctx); | |
4188 | } | |
4189 | ||
4190 | return ret; | |
4191 | } | |
4192 | ||
4193 | static int changed_xattr(struct send_ctx *sctx, | |
4194 | enum btrfs_compare_tree_result result) | |
4195 | { | |
4196 | int ret = 0; | |
4197 | ||
4198 | BUG_ON(sctx->cur_ino != sctx->cmp_key->objectid); | |
4199 | ||
4200 | if (!sctx->cur_inode_new_gen && !sctx->cur_inode_deleted) { | |
4201 | if (result == BTRFS_COMPARE_TREE_NEW) | |
4202 | ret = process_new_xattr(sctx); | |
4203 | else if (result == BTRFS_COMPARE_TREE_DELETED) | |
4204 | ret = process_deleted_xattr(sctx); | |
4205 | else if (result == BTRFS_COMPARE_TREE_CHANGED) | |
4206 | ret = process_changed_xattr(sctx); | |
4207 | } | |
4208 | ||
4209 | return ret; | |
4210 | } | |
4211 | ||
4212 | static int changed_extent(struct send_ctx *sctx, | |
4213 | enum btrfs_compare_tree_result result) | |
4214 | { | |
4215 | int ret = 0; | |
4216 | ||
4217 | BUG_ON(sctx->cur_ino != sctx->cmp_key->objectid); | |
4218 | ||
4219 | if (!sctx->cur_inode_new_gen && !sctx->cur_inode_deleted) { | |
4220 | if (result != BTRFS_COMPARE_TREE_DELETED) | |
4221 | ret = process_extent(sctx, sctx->left_path, | |
4222 | sctx->cmp_key); | |
4223 | } | |
4224 | ||
4225 | return ret; | |
4226 | } | |
4227 | ||
4228 | ||
4229 | static int changed_cb(struct btrfs_root *left_root, | |
4230 | struct btrfs_root *right_root, | |
4231 | struct btrfs_path *left_path, | |
4232 | struct btrfs_path *right_path, | |
4233 | struct btrfs_key *key, | |
4234 | enum btrfs_compare_tree_result result, | |
4235 | void *ctx) | |
4236 | { | |
4237 | int ret = 0; | |
4238 | struct send_ctx *sctx = ctx; | |
4239 | ||
4240 | sctx->left_path = left_path; | |
4241 | sctx->right_path = right_path; | |
4242 | sctx->cmp_key = key; | |
4243 | ||
4244 | ret = finish_inode_if_needed(sctx, 0); | |
4245 | if (ret < 0) | |
4246 | goto out; | |
4247 | ||
4248 | if (key->type == BTRFS_INODE_ITEM_KEY) | |
4249 | ret = changed_inode(sctx, result); | |
4250 | else if (key->type == BTRFS_INODE_REF_KEY) | |
4251 | ret = changed_ref(sctx, result); | |
4252 | else if (key->type == BTRFS_XATTR_ITEM_KEY) | |
4253 | ret = changed_xattr(sctx, result); | |
4254 | else if (key->type == BTRFS_EXTENT_DATA_KEY) | |
4255 | ret = changed_extent(sctx, result); | |
4256 | ||
4257 | out: | |
4258 | return ret; | |
4259 | } | |
4260 | ||
4261 | static int full_send_tree(struct send_ctx *sctx) | |
4262 | { | |
4263 | int ret; | |
4264 | struct btrfs_trans_handle *trans = NULL; | |
4265 | struct btrfs_root *send_root = sctx->send_root; | |
4266 | struct btrfs_key key; | |
4267 | struct btrfs_key found_key; | |
4268 | struct btrfs_path *path; | |
4269 | struct extent_buffer *eb; | |
4270 | int slot; | |
4271 | u64 start_ctransid; | |
4272 | u64 ctransid; | |
4273 | ||
4274 | path = alloc_path_for_send(); | |
4275 | if (!path) | |
4276 | return -ENOMEM; | |
4277 | ||
4278 | spin_lock(&send_root->root_times_lock); | |
4279 | start_ctransid = btrfs_root_ctransid(&send_root->root_item); | |
4280 | spin_unlock(&send_root->root_times_lock); | |
4281 | ||
4282 | key.objectid = BTRFS_FIRST_FREE_OBJECTID; | |
4283 | key.type = BTRFS_INODE_ITEM_KEY; | |
4284 | key.offset = 0; | |
4285 | ||
4286 | join_trans: | |
4287 | /* | |
4288 | * We need to make sure the transaction does not get committed | |
4289 | * while we do anything on commit roots. Join a transaction to prevent | |
4290 | * this. | |
4291 | */ | |
4292 | trans = btrfs_join_transaction(send_root); | |
4293 | if (IS_ERR(trans)) { | |
4294 | ret = PTR_ERR(trans); | |
4295 | trans = NULL; | |
4296 | goto out; | |
4297 | } | |
4298 | ||
4299 | /* | |
4300 | * Make sure the tree has not changed | |
4301 | */ | |
4302 | spin_lock(&send_root->root_times_lock); | |
4303 | ctransid = btrfs_root_ctransid(&send_root->root_item); | |
4304 | spin_unlock(&send_root->root_times_lock); | |
4305 | ||
4306 | if (ctransid != start_ctransid) { | |
4307 | WARN(1, KERN_WARNING "btrfs: the root that you're trying to " | |
4308 | "send was modified in between. This is " | |
4309 | "probably a bug.\n"); | |
4310 | ret = -EIO; | |
4311 | goto out; | |
4312 | } | |
4313 | ||
4314 | ret = btrfs_search_slot_for_read(send_root, &key, path, 1, 0); | |
4315 | if (ret < 0) | |
4316 | goto out; | |
4317 | if (ret) | |
4318 | goto out_finish; | |
4319 | ||
4320 | while (1) { | |
4321 | /* | |
4322 | * When someone want to commit while we iterate, end the | |
4323 | * joined transaction and rejoin. | |
4324 | */ | |
4325 | if (btrfs_should_end_transaction(trans, send_root)) { | |
4326 | ret = btrfs_end_transaction(trans, send_root); | |
4327 | trans = NULL; | |
4328 | if (ret < 0) | |
4329 | goto out; | |
4330 | btrfs_release_path(path); | |
4331 | goto join_trans; | |
4332 | } | |
4333 | ||
4334 | eb = path->nodes[0]; | |
4335 | slot = path->slots[0]; | |
4336 | btrfs_item_key_to_cpu(eb, &found_key, slot); | |
4337 | ||
4338 | ret = changed_cb(send_root, NULL, path, NULL, | |
4339 | &found_key, BTRFS_COMPARE_TREE_NEW, sctx); | |
4340 | if (ret < 0) | |
4341 | goto out; | |
4342 | ||
4343 | key.objectid = found_key.objectid; | |
4344 | key.type = found_key.type; | |
4345 | key.offset = found_key.offset + 1; | |
4346 | ||
4347 | ret = btrfs_next_item(send_root, path); | |
4348 | if (ret < 0) | |
4349 | goto out; | |
4350 | if (ret) { | |
4351 | ret = 0; | |
4352 | break; | |
4353 | } | |
4354 | } | |
4355 | ||
4356 | out_finish: | |
4357 | ret = finish_inode_if_needed(sctx, 1); | |
4358 | ||
4359 | out: | |
4360 | btrfs_free_path(path); | |
4361 | if (trans) { | |
4362 | if (!ret) | |
4363 | ret = btrfs_end_transaction(trans, send_root); | |
4364 | else | |
4365 | btrfs_end_transaction(trans, send_root); | |
4366 | } | |
4367 | return ret; | |
4368 | } | |
4369 | ||
4370 | static int send_subvol(struct send_ctx *sctx) | |
4371 | { | |
4372 | int ret; | |
4373 | ||
4374 | ret = send_header(sctx); | |
4375 | if (ret < 0) | |
4376 | goto out; | |
4377 | ||
4378 | ret = send_subvol_begin(sctx); | |
4379 | if (ret < 0) | |
4380 | goto out; | |
4381 | ||
4382 | if (sctx->parent_root) { | |
4383 | ret = btrfs_compare_trees(sctx->send_root, sctx->parent_root, | |
4384 | changed_cb, sctx); | |
4385 | if (ret < 0) | |
4386 | goto out; | |
4387 | ret = finish_inode_if_needed(sctx, 1); | |
4388 | if (ret < 0) | |
4389 | goto out; | |
4390 | } else { | |
4391 | ret = full_send_tree(sctx); | |
4392 | if (ret < 0) | |
4393 | goto out; | |
4394 | } | |
4395 | ||
4396 | out: | |
4397 | if (!ret) | |
4398 | ret = close_cur_inode_file(sctx); | |
4399 | else | |
4400 | close_cur_inode_file(sctx); | |
4401 | ||
4402 | free_recorded_refs(sctx); | |
4403 | return ret; | |
4404 | } | |
4405 | ||
4406 | long btrfs_ioctl_send(struct file *mnt_file, void __user *arg_) | |
4407 | { | |
4408 | int ret = 0; | |
4409 | struct btrfs_root *send_root; | |
4410 | struct btrfs_root *clone_root; | |
4411 | struct btrfs_fs_info *fs_info; | |
4412 | struct btrfs_ioctl_send_args *arg = NULL; | |
4413 | struct btrfs_key key; | |
4414 | struct file *filp = NULL; | |
4415 | struct send_ctx *sctx = NULL; | |
4416 | u32 i; | |
4417 | u64 *clone_sources_tmp = NULL; | |
4418 | ||
4419 | if (!capable(CAP_SYS_ADMIN)) | |
4420 | return -EPERM; | |
4421 | ||
4422 | send_root = BTRFS_I(fdentry(mnt_file)->d_inode)->root; | |
4423 | fs_info = send_root->fs_info; | |
4424 | ||
4425 | arg = memdup_user(arg_, sizeof(*arg)); | |
4426 | if (IS_ERR(arg)) { | |
4427 | ret = PTR_ERR(arg); | |
4428 | arg = NULL; | |
4429 | goto out; | |
4430 | } | |
4431 | ||
4432 | if (!access_ok(VERIFY_READ, arg->clone_sources, | |
4433 | sizeof(*arg->clone_sources * | |
4434 | arg->clone_sources_count))) { | |
4435 | ret = -EFAULT; | |
4436 | goto out; | |
4437 | } | |
4438 | ||
4439 | sctx = kzalloc(sizeof(struct send_ctx), GFP_NOFS); | |
4440 | if (!sctx) { | |
4441 | ret = -ENOMEM; | |
4442 | goto out; | |
4443 | } | |
4444 | ||
4445 | INIT_LIST_HEAD(&sctx->new_refs); | |
4446 | INIT_LIST_HEAD(&sctx->deleted_refs); | |
4447 | INIT_RADIX_TREE(&sctx->name_cache, GFP_NOFS); | |
4448 | INIT_LIST_HEAD(&sctx->name_cache_list); | |
4449 | ||
4450 | sctx->send_filp = fget(arg->send_fd); | |
4451 | if (IS_ERR(sctx->send_filp)) { | |
4452 | ret = PTR_ERR(sctx->send_filp); | |
4453 | goto out; | |
4454 | } | |
4455 | ||
4456 | sctx->mnt = mnt_file->f_path.mnt; | |
4457 | ||
4458 | sctx->send_root = send_root; | |
4459 | sctx->clone_roots_cnt = arg->clone_sources_count; | |
4460 | ||
4461 | sctx->send_max_size = BTRFS_SEND_BUF_SIZE; | |
4462 | sctx->send_buf = vmalloc(sctx->send_max_size); | |
4463 | if (!sctx->send_buf) { | |
4464 | ret = -ENOMEM; | |
4465 | goto out; | |
4466 | } | |
4467 | ||
4468 | sctx->read_buf = vmalloc(BTRFS_SEND_READ_SIZE); | |
4469 | if (!sctx->read_buf) { | |
4470 | ret = -ENOMEM; | |
4471 | goto out; | |
4472 | } | |
4473 | ||
4474 | sctx->clone_roots = vzalloc(sizeof(struct clone_root) * | |
4475 | (arg->clone_sources_count + 1)); | |
4476 | if (!sctx->clone_roots) { | |
4477 | ret = -ENOMEM; | |
4478 | goto out; | |
4479 | } | |
4480 | ||
4481 | if (arg->clone_sources_count) { | |
4482 | clone_sources_tmp = vmalloc(arg->clone_sources_count * | |
4483 | sizeof(*arg->clone_sources)); | |
4484 | if (!clone_sources_tmp) { | |
4485 | ret = -ENOMEM; | |
4486 | goto out; | |
4487 | } | |
4488 | ||
4489 | ret = copy_from_user(clone_sources_tmp, arg->clone_sources, | |
4490 | arg->clone_sources_count * | |
4491 | sizeof(*arg->clone_sources)); | |
4492 | if (ret) { | |
4493 | ret = -EFAULT; | |
4494 | goto out; | |
4495 | } | |
4496 | ||
4497 | for (i = 0; i < arg->clone_sources_count; i++) { | |
4498 | key.objectid = clone_sources_tmp[i]; | |
4499 | key.type = BTRFS_ROOT_ITEM_KEY; | |
4500 | key.offset = (u64)-1; | |
4501 | clone_root = btrfs_read_fs_root_no_name(fs_info, &key); | |
4502 | if (!clone_root) { | |
4503 | ret = -EINVAL; | |
4504 | goto out; | |
4505 | } | |
4506 | if (IS_ERR(clone_root)) { | |
4507 | ret = PTR_ERR(clone_root); | |
4508 | goto out; | |
4509 | } | |
4510 | sctx->clone_roots[i].root = clone_root; | |
4511 | } | |
4512 | vfree(clone_sources_tmp); | |
4513 | clone_sources_tmp = NULL; | |
4514 | } | |
4515 | ||
4516 | if (arg->parent_root) { | |
4517 | key.objectid = arg->parent_root; | |
4518 | key.type = BTRFS_ROOT_ITEM_KEY; | |
4519 | key.offset = (u64)-1; | |
4520 | sctx->parent_root = btrfs_read_fs_root_no_name(fs_info, &key); | |
4521 | if (!sctx->parent_root) { | |
4522 | ret = -EINVAL; | |
4523 | goto out; | |
4524 | } | |
4525 | } | |
4526 | ||
4527 | /* | |
4528 | * Clones from send_root are allowed, but only if the clone source | |
4529 | * is behind the current send position. This is checked while searching | |
4530 | * for possible clone sources. | |
4531 | */ | |
4532 | sctx->clone_roots[sctx->clone_roots_cnt++].root = sctx->send_root; | |
4533 | ||
4534 | /* We do a bsearch later */ | |
4535 | sort(sctx->clone_roots, sctx->clone_roots_cnt, | |
4536 | sizeof(*sctx->clone_roots), __clone_root_cmp_sort, | |
4537 | NULL); | |
4538 | ||
4539 | ret = send_subvol(sctx); | |
4540 | if (ret < 0) | |
4541 | goto out; | |
4542 | ||
4543 | ret = begin_cmd(sctx, BTRFS_SEND_C_END); | |
4544 | if (ret < 0) | |
4545 | goto out; | |
4546 | ret = send_cmd(sctx); | |
4547 | if (ret < 0) | |
4548 | goto out; | |
4549 | ||
4550 | out: | |
4551 | if (filp) | |
4552 | fput(filp); | |
4553 | kfree(arg); | |
4554 | vfree(clone_sources_tmp); | |
4555 | ||
4556 | if (sctx) { | |
4557 | if (sctx->send_filp) | |
4558 | fput(sctx->send_filp); | |
4559 | ||
4560 | vfree(sctx->clone_roots); | |
4561 | vfree(sctx->send_buf); | |
4562 | vfree(sctx->read_buf); | |
4563 | ||
4564 | name_cache_free(sctx); | |
4565 | ||
4566 | kfree(sctx); | |
4567 | } | |
4568 | ||
4569 | return ret; | |
4570 | } |