]>
Commit | Line | Data |
---|---|---|
849958d1 LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2014 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
cda134ab | 22 | #include <sys/sendfile.h> |
e6bd041c | 23 | #include <sys/xattr.h> |
cda134ab | 24 | |
849958d1 | 25 | #include "util.h" |
d7c7c334 | 26 | #include "btrfs-util.h" |
8420fa3a | 27 | #include "strv.h" |
849958d1 LP |
28 | #include "copy.h" |
29 | ||
f2cbe59e LP |
30 | #define COPY_BUFFER_SIZE (16*1024) |
31 | ||
59f448cf | 32 | int copy_bytes(int fdf, int fdt, uint64_t max_bytes, bool try_reflink) { |
81d20007 | 33 | bool try_sendfile = true, try_splice = true; |
0254b455 | 34 | int r; |
cda134ab | 35 | |
849958d1 LP |
36 | assert(fdf >= 0); |
37 | assert(fdt >= 0); | |
38 | ||
0254b455 | 39 | /* Try btrfs reflinks first. */ |
c622fbdb LP |
40 | if (try_reflink && |
41 | max_bytes == (uint64_t) -1 && | |
42 | lseek(fdf, 0, SEEK_CUR) == 0 && | |
43 | lseek(fdt, 0, SEEK_CUR) == 0) { | |
44 | ||
0254b455 LP |
45 | r = btrfs_reflink(fdf, fdt); |
46 | if (r >= 0) | |
f6d9c616 | 47 | return 0; /* we copied the whole thing, hence hit EOF, return 0 */ |
0254b455 LP |
48 | } |
49 | ||
849958d1 | 50 | for (;;) { |
f2cbe59e | 51 | size_t m = COPY_BUFFER_SIZE; |
cda134ab | 52 | ssize_t n; |
93240d3a | 53 | |
59f448cf | 54 | if (max_bytes != (uint64_t) -1) { |
93240d3a LP |
55 | |
56 | if (max_bytes <= 0) | |
f6d9c616 | 57 | return 1; /* return > 0 if we hit the max_bytes limit */ |
93240d3a | 58 | |
59f448cf | 59 | if ((uint64_t) m > max_bytes) |
93240d3a LP |
60 | m = (size_t) max_bytes; |
61 | } | |
62 | ||
cda134ab LP |
63 | /* First try sendfile(), unless we already tried */ |
64 | if (try_sendfile) { | |
65 | ||
66 | n = sendfile(fdt, fdf, NULL, m); | |
67 | if (n < 0) { | |
68 | if (errno != EINVAL && errno != ENOSYS) | |
69 | return -errno; | |
70 | ||
71 | try_sendfile = false; | |
72 | /* use fallback below */ | |
73 | } else if (n == 0) /* EOF */ | |
74 | break; | |
75 | else if (n > 0) | |
81d20007 LP |
76 | /* Success! */ |
77 | goto next; | |
78 | } | |
79 | ||
80 | /* The try splice, unless we already tried */ | |
81 | if (try_splice) { | |
f6d9c616 | 82 | n = splice(fdf, NULL, fdt, NULL, m, 0); |
81d20007 LP |
83 | if (n < 0) { |
84 | if (errno != EINVAL && errno != ENOSYS) | |
85 | return -errno; | |
86 | ||
87 | try_splice = false; | |
88 | /* use fallback below */ | |
89 | } else if (n == 0) /* EOF */ | |
90 | break; | |
91 | else if (n > 0) | |
92 | /* Success! */ | |
cda134ab LP |
93 | goto next; |
94 | } | |
95 | ||
96 | /* As a fallback just copy bits by hand */ | |
97 | { | |
f6d9c616 | 98 | uint8_t buf[m]; |
849958d1 | 99 | |
cda134ab LP |
100 | n = read(fdf, buf, m); |
101 | if (n < 0) | |
102 | return -errno; | |
103 | if (n == 0) /* EOF */ | |
104 | break; | |
105 | ||
0254b455 | 106 | r = loop_write(fdt, buf, (size_t) n, false); |
553acb7b ZJS |
107 | if (r < 0) |
108 | return r; | |
cda134ab | 109 | } |
93240d3a | 110 | |
cda134ab | 111 | next: |
59f448cf LP |
112 | if (max_bytes != (uint64_t) -1) { |
113 | assert(max_bytes >= (uint64_t) n); | |
93240d3a LP |
114 | max_bytes -= n; |
115 | } | |
849958d1 LP |
116 | } |
117 | ||
f6d9c616 | 118 | return 0; /* return 0 if we hit EOF earlier than the size limit */ |
849958d1 LP |
119 | } |
120 | ||
121 | static int fd_copy_symlink(int df, const char *from, const struct stat *st, int dt, const char *to) { | |
122 | _cleanup_free_ char *target = NULL; | |
123 | int r; | |
124 | ||
125 | assert(from); | |
126 | assert(st); | |
127 | assert(to); | |
128 | ||
129 | r = readlinkat_malloc(df, from, &target); | |
130 | if (r < 0) | |
131 | return r; | |
132 | ||
e156347e | 133 | if (symlinkat(target, dt, to) < 0) |
849958d1 | 134 | return -errno; |
849958d1 LP |
135 | |
136 | if (fchownat(dt, to, st->st_uid, st->st_gid, AT_SYMLINK_NOFOLLOW) < 0) | |
137 | return -errno; | |
138 | ||
139 | return 0; | |
140 | } | |
141 | ||
142 | static int fd_copy_regular(int df, const char *from, const struct stat *st, int dt, const char *to) { | |
143 | _cleanup_close_ int fdf = -1, fdt = -1; | |
ebd93cb6 | 144 | struct timespec ts[2]; |
849958d1 LP |
145 | int r, q; |
146 | ||
147 | assert(from); | |
148 | assert(st); | |
149 | assert(to); | |
150 | ||
151 | fdf = openat(df, from, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW); | |
152 | if (fdf < 0) | |
153 | return -errno; | |
154 | ||
155 | fdt = openat(dt, to, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, st->st_mode & 07777); | |
e156347e | 156 | if (fdt < 0) |
849958d1 | 157 | return -errno; |
849958d1 | 158 | |
59f448cf | 159 | r = copy_bytes(fdf, fdt, (uint64_t) -1, true); |
849958d1 LP |
160 | if (r < 0) { |
161 | unlinkat(dt, to, 0); | |
162 | return r; | |
163 | } | |
164 | ||
165 | if (fchown(fdt, st->st_uid, st->st_gid) < 0) | |
166 | r = -errno; | |
167 | ||
168 | if (fchmod(fdt, st->st_mode & 07777) < 0) | |
169 | r = -errno; | |
170 | ||
ebd93cb6 LP |
171 | ts[0] = st->st_atim; |
172 | ts[1] = st->st_mtim; | |
173 | (void) futimens(fdt, ts); | |
174 | ||
e6bd041c LP |
175 | (void) copy_xattr(fdf, fdt); |
176 | ||
849958d1 LP |
177 | q = close(fdt); |
178 | fdt = -1; | |
179 | ||
180 | if (q < 0) { | |
181 | r = -errno; | |
182 | unlinkat(dt, to, 0); | |
183 | } | |
184 | ||
185 | return r; | |
186 | } | |
187 | ||
188 | static int fd_copy_fifo(int df, const char *from, const struct stat *st, int dt, const char *to) { | |
189 | int r; | |
190 | ||
191 | assert(from); | |
192 | assert(st); | |
193 | assert(to); | |
194 | ||
195 | r = mkfifoat(dt, to, st->st_mode & 07777); | |
e156347e | 196 | if (r < 0) |
849958d1 | 197 | return -errno; |
849958d1 LP |
198 | |
199 | if (fchownat(dt, to, st->st_uid, st->st_gid, AT_SYMLINK_NOFOLLOW) < 0) | |
200 | r = -errno; | |
201 | ||
202 | if (fchmodat(dt, to, st->st_mode & 07777, 0) < 0) | |
203 | r = -errno; | |
204 | ||
205 | return r; | |
206 | } | |
207 | ||
208 | static int fd_copy_node(int df, const char *from, const struct stat *st, int dt, const char *to) { | |
209 | int r; | |
210 | ||
211 | assert(from); | |
212 | assert(st); | |
213 | assert(to); | |
214 | ||
215 | r = mknodat(dt, to, st->st_mode, st->st_rdev); | |
e156347e | 216 | if (r < 0) |
849958d1 | 217 | return -errno; |
849958d1 LP |
218 | |
219 | if (fchownat(dt, to, st->st_uid, st->st_gid, AT_SYMLINK_NOFOLLOW) < 0) | |
220 | r = -errno; | |
221 | ||
222 | if (fchmodat(dt, to, st->st_mode & 07777, 0) < 0) | |
223 | r = -errno; | |
224 | ||
225 | return r; | |
226 | } | |
227 | ||
d7c7c334 LP |
228 | static int fd_copy_directory( |
229 | int df, | |
230 | const char *from, | |
231 | const struct stat *st, | |
232 | int dt, | |
233 | const char *to, | |
234 | dev_t original_device, | |
235 | bool merge) { | |
236 | ||
849958d1 LP |
237 | _cleanup_close_ int fdf = -1, fdt = -1; |
238 | _cleanup_closedir_ DIR *d = NULL; | |
239 | struct dirent *de; | |
240 | bool created; | |
241 | int r; | |
242 | ||
849958d1 LP |
243 | assert(st); |
244 | assert(to); | |
245 | ||
d7c7c334 LP |
246 | if (from) |
247 | fdf = openat(df, from, O_RDONLY|O_DIRECTORY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW); | |
248 | else | |
249 | fdf = fcntl(df, F_DUPFD_CLOEXEC, 3); | |
849958d1 LP |
250 | |
251 | d = fdopendir(fdf); | |
252 | if (!d) | |
253 | return -errno; | |
254 | fdf = -1; | |
255 | ||
256 | r = mkdirat(dt, to, st->st_mode & 07777); | |
257 | if (r >= 0) | |
258 | created = true; | |
e156347e | 259 | else if (errno == EEXIST && merge) |
849958d1 LP |
260 | created = false; |
261 | else | |
262 | return -errno; | |
263 | ||
264 | fdt = openat(dt, to, O_RDONLY|O_DIRECTORY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW); | |
265 | if (fdt < 0) | |
266 | return -errno; | |
267 | ||
2c455af4 LP |
268 | r = 0; |
269 | ||
849958d1 | 270 | if (created) { |
ebd93cb6 LP |
271 | struct timespec ut[2] = { |
272 | st->st_atim, | |
273 | st->st_mtim | |
274 | }; | |
275 | ||
849958d1 LP |
276 | if (fchown(fdt, st->st_uid, st->st_gid) < 0) |
277 | r = -errno; | |
278 | ||
279 | if (fchmod(fdt, st->st_mode & 07777) < 0) | |
280 | r = -errno; | |
e6bd041c | 281 | |
ebd93cb6 LP |
282 | (void) futimens(fdt, ut); |
283 | (void) copy_xattr(dirfd(d), fdt); | |
849958d1 LP |
284 | } |
285 | ||
8420fa3a | 286 | FOREACH_DIRENT_ALL(de, d, return -errno) { |
849958d1 LP |
287 | struct stat buf; |
288 | int q; | |
289 | ||
8420fa3a LP |
290 | if (STR_IN_SET(de->d_name, ".", "..")) |
291 | continue; | |
292 | ||
849958d1 LP |
293 | if (fstatat(dirfd(d), de->d_name, &buf, AT_SYMLINK_NOFOLLOW) < 0) { |
294 | r = -errno; | |
295 | continue; | |
296 | } | |
297 | ||
298 | if (buf.st_dev != original_device) | |
299 | continue; | |
300 | ||
301 | if (S_ISREG(buf.st_mode)) | |
302 | q = fd_copy_regular(dirfd(d), de->d_name, &buf, fdt, de->d_name); | |
303 | else if (S_ISDIR(buf.st_mode)) | |
e156347e | 304 | q = fd_copy_directory(dirfd(d), de->d_name, &buf, fdt, de->d_name, original_device, merge); |
849958d1 LP |
305 | else if (S_ISLNK(buf.st_mode)) |
306 | q = fd_copy_symlink(dirfd(d), de->d_name, &buf, fdt, de->d_name); | |
307 | else if (S_ISFIFO(buf.st_mode)) | |
308 | q = fd_copy_fifo(dirfd(d), de->d_name, &buf, fdt, de->d_name); | |
309 | else if (S_ISBLK(buf.st_mode) || S_ISCHR(buf.st_mode)) | |
310 | q = fd_copy_node(dirfd(d), de->d_name, &buf, fdt, de->d_name); | |
311 | else | |
15411c0c | 312 | q = -EOPNOTSUPP; |
849958d1 | 313 | |
e156347e LP |
314 | if (q == -EEXIST && merge) |
315 | q = 0; | |
316 | ||
849958d1 LP |
317 | if (q < 0) |
318 | r = q; | |
319 | } | |
320 | ||
321 | return r; | |
322 | } | |
323 | ||
f2cbe59e | 324 | int copy_tree_at(int fdf, const char *from, int fdt, const char *to, bool merge) { |
849958d1 LP |
325 | struct stat st; |
326 | ||
327 | assert(from); | |
328 | assert(to); | |
329 | ||
f2cbe59e | 330 | if (fstatat(fdf, from, &st, AT_SYMLINK_NOFOLLOW) < 0) |
849958d1 LP |
331 | return -errno; |
332 | ||
333 | if (S_ISREG(st.st_mode)) | |
f2cbe59e | 334 | return fd_copy_regular(fdf, from, &st, fdt, to); |
849958d1 | 335 | else if (S_ISDIR(st.st_mode)) |
f2cbe59e | 336 | return fd_copy_directory(fdf, from, &st, fdt, to, st.st_dev, merge); |
849958d1 | 337 | else if (S_ISLNK(st.st_mode)) |
f2cbe59e | 338 | return fd_copy_symlink(fdf, from, &st, fdt, to); |
849958d1 | 339 | else if (S_ISFIFO(st.st_mode)) |
f2cbe59e | 340 | return fd_copy_fifo(fdf, from, &st, fdt, to); |
849958d1 | 341 | else if (S_ISBLK(st.st_mode) || S_ISCHR(st.st_mode)) |
f2cbe59e | 342 | return fd_copy_node(fdf, from, &st, fdt, to); |
849958d1 | 343 | else |
15411c0c | 344 | return -EOPNOTSUPP; |
849958d1 LP |
345 | } |
346 | ||
f2cbe59e LP |
347 | int copy_tree(const char *from, const char *to, bool merge) { |
348 | return copy_tree_at(AT_FDCWD, from, AT_FDCWD, to, merge); | |
349 | } | |
350 | ||
351 | int copy_directory_fd(int dirfd, const char *to, bool merge) { | |
d7c7c334 LP |
352 | |
353 | struct stat st; | |
354 | ||
355 | assert(dirfd >= 0); | |
356 | assert(to); | |
357 | ||
358 | if (fstat(dirfd, &st) < 0) | |
359 | return -errno; | |
360 | ||
361 | if (!S_ISDIR(st.st_mode)) | |
362 | return -ENOTDIR; | |
363 | ||
364 | return fd_copy_directory(dirfd, NULL, &st, AT_FDCWD, to, st.st_dev, merge); | |
365 | } | |
366 | ||
7430ec6a | 367 | int copy_file_fd(const char *from, int fdt, bool try_reflink) { |
cda134ab | 368 | _cleanup_close_ int fdf = -1; |
e6bd041c | 369 | int r; |
849958d1 LP |
370 | |
371 | assert(from); | |
cda134ab | 372 | assert(fdt >= 0); |
849958d1 LP |
373 | |
374 | fdf = open(from, O_RDONLY|O_CLOEXEC|O_NOCTTY); | |
375 | if (fdf < 0) | |
376 | return -errno; | |
377 | ||
59f448cf | 378 | r = copy_bytes(fdf, fdt, (uint64_t) -1, try_reflink); |
e6bd041c LP |
379 | |
380 | (void) copy_times(fdf, fdt); | |
381 | (void) copy_xattr(fdf, fdt); | |
382 | ||
383 | return r; | |
cda134ab LP |
384 | } |
385 | ||
45030287 | 386 | int copy_file(const char *from, const char *to, int flags, mode_t mode, unsigned chattr_flags) { |
a7f7d1bd | 387 | int fdt = -1, r; |
cda134ab LP |
388 | |
389 | assert(from); | |
390 | assert(to); | |
391 | ||
ebd93cb6 LP |
392 | RUN_WITH_UMASK(0000) { |
393 | fdt = open(to, flags|O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY, mode); | |
394 | if (fdt < 0) | |
395 | return -errno; | |
396 | } | |
849958d1 | 397 | |
f2068bcc | 398 | if (chattr_flags != 0) |
1ed8f8c1 | 399 | (void) chattr_fd(fdt, chattr_flags, (unsigned) -1); |
f2068bcc | 400 | |
7430ec6a | 401 | r = copy_file_fd(from, fdt, true); |
849958d1 | 402 | if (r < 0) { |
cda134ab | 403 | close(fdt); |
849958d1 LP |
404 | unlink(to); |
405 | return r; | |
406 | } | |
407 | ||
cda134ab LP |
408 | if (close(fdt) < 0) { |
409 | unlink_noerrno(to); | |
410 | return -errno; | |
849958d1 LP |
411 | } |
412 | ||
413 | return 0; | |
414 | } | |
e6bd041c | 415 | |
45030287 | 416 | int copy_file_atomic(const char *from, const char *to, mode_t mode, bool replace, unsigned chattr_flags) { |
a7f7d1bd | 417 | _cleanup_free_ char *t = NULL; |
ebd93cb6 LP |
418 | int r; |
419 | ||
420 | assert(from); | |
421 | assert(to); | |
422 | ||
14bcf25c | 423 | r = tempfn_random(to, NULL, &t); |
ebd93cb6 LP |
424 | if (r < 0) |
425 | return r; | |
426 | ||
f2068bcc | 427 | r = copy_file(from, t, O_NOFOLLOW|O_EXCL, mode, chattr_flags); |
ebd93cb6 LP |
428 | if (r < 0) |
429 | return r; | |
430 | ||
f85ef957 AC |
431 | if (replace) { |
432 | r = renameat(AT_FDCWD, t, AT_FDCWD, to); | |
433 | if (r < 0) | |
434 | r = -errno; | |
435 | } else | |
436 | r = rename_noreplace(AT_FDCWD, t, AT_FDCWD, to); | |
437 | if (r < 0) { | |
438 | (void) unlink_noerrno(t); | |
439 | return r; | |
ebd93cb6 LP |
440 | } |
441 | ||
442 | return 0; | |
443 | } | |
444 | ||
e6bd041c LP |
445 | int copy_times(int fdf, int fdt) { |
446 | struct timespec ut[2]; | |
447 | struct stat st; | |
a7f7d1bd | 448 | usec_t crtime = 0; |
e6bd041c LP |
449 | |
450 | assert(fdf >= 0); | |
451 | assert(fdt >= 0); | |
452 | ||
453 | if (fstat(fdf, &st) < 0) | |
454 | return -errno; | |
455 | ||
456 | ut[0] = st.st_atim; | |
457 | ut[1] = st.st_mtim; | |
458 | ||
459 | if (futimens(fdt, ut) < 0) | |
460 | return -errno; | |
461 | ||
462 | if (fd_getcrtime(fdf, &crtime) >= 0) | |
463 | (void) fd_setcrtime(fdt, crtime); | |
464 | ||
465 | return 0; | |
466 | } | |
467 | ||
468 | int copy_xattr(int fdf, int fdt) { | |
469 | _cleanup_free_ char *bufa = NULL, *bufb = NULL; | |
470 | size_t sza = 100, szb = 100; | |
471 | ssize_t n; | |
472 | int ret = 0; | |
473 | const char *p; | |
474 | ||
475 | for (;;) { | |
476 | bufa = malloc(sza); | |
477 | if (!bufa) | |
478 | return -ENOMEM; | |
479 | ||
480 | n = flistxattr(fdf, bufa, sza); | |
481 | if (n == 0) | |
482 | return 0; | |
483 | if (n > 0) | |
484 | break; | |
485 | if (errno != ERANGE) | |
486 | return -errno; | |
487 | ||
488 | sza *= 2; | |
489 | ||
97b11eed | 490 | bufa = mfree(bufa); |
e6bd041c LP |
491 | } |
492 | ||
493 | p = bufa; | |
494 | while (n > 0) { | |
495 | size_t l; | |
496 | ||
497 | l = strlen(p); | |
498 | assert(l < (size_t) n); | |
499 | ||
500 | if (startswith(p, "user.")) { | |
501 | ssize_t m; | |
502 | ||
503 | if (!bufb) { | |
504 | bufb = malloc(szb); | |
505 | if (!bufb) | |
506 | return -ENOMEM; | |
507 | } | |
508 | ||
509 | m = fgetxattr(fdf, p, bufb, szb); | |
510 | if (m < 0) { | |
511 | if (errno == ERANGE) { | |
512 | szb *= 2; | |
97b11eed | 513 | bufb = mfree(bufb); |
e6bd041c LP |
514 | continue; |
515 | } | |
516 | ||
517 | return -errno; | |
518 | } | |
519 | ||
520 | if (fsetxattr(fdt, p, bufb, m, 0) < 0) | |
521 | ret = -errno; | |
522 | } | |
523 | ||
524 | p += l + 1; | |
525 | n -= l + 1; | |
526 | } | |
527 | ||
528 | return ret; | |
529 | } |