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Commit | Line | Data |
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849958d1 LP |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2014 Lennart Poettering | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
11c3a366 TA |
20 | #include <dirent.h> |
21 | #include <errno.h> | |
22 | #include <fcntl.h> | |
23 | #include <stddef.h> | |
24 | #include <stdio.h> | |
25 | #include <stdlib.h> | |
26 | #include <string.h> | |
cda134ab | 27 | #include <sys/sendfile.h> |
11c3a366 | 28 | #include <sys/stat.h> |
e6bd041c | 29 | #include <sys/xattr.h> |
11c3a366 TA |
30 | #include <time.h> |
31 | #include <unistd.h> | |
cda134ab | 32 | |
b5efdb8a | 33 | #include "alloc-util.h" |
d7c7c334 | 34 | #include "btrfs-util.h" |
c8b3094d | 35 | #include "chattr-util.h" |
3ffd4af2 | 36 | #include "copy.h" |
a0956174 | 37 | #include "dirent-util.h" |
3ffd4af2 | 38 | #include "fd-util.h" |
0d39fa9c | 39 | #include "fileio.h" |
f4f15635 | 40 | #include "fs-util.h" |
c004493c | 41 | #include "io-util.h" |
11c3a366 | 42 | #include "macro.h" |
a44202e9 | 43 | #include "missing.h" |
07630cea | 44 | #include "string-util.h" |
8420fa3a | 45 | #include "strv.h" |
93cc7779 | 46 | #include "time-util.h" |
affb60b1 | 47 | #include "umask-util.h" |
89a5a90c | 48 | #include "xattr-util.h" |
849958d1 | 49 | |
00a8cf77 | 50 | #define COPY_BUFFER_SIZE (16*1024u) |
f2cbe59e | 51 | |
a44202e9 ZJS |
52 | static ssize_t try_copy_file_range(int fd_in, loff_t *off_in, |
53 | int fd_out, loff_t *off_out, | |
54 | size_t len, | |
55 | unsigned int flags) { | |
56 | static int have = -1; | |
57 | ssize_t r; | |
58 | ||
59 | if (have == false) | |
60 | return -ENOSYS; | |
61 | ||
62 | r = copy_file_range(fd_in, off_in, fd_out, off_out, len, flags); | |
63 | if (_unlikely_(have < 0)) | |
64 | have = r >= 0 || errno != ENOSYS; | |
65 | if (r >= 0) | |
66 | return r; | |
67 | else | |
68 | return -errno; | |
69 | } | |
70 | ||
59f448cf | 71 | int copy_bytes(int fdf, int fdt, uint64_t max_bytes, bool try_reflink) { |
a44202e9 | 72 | bool try_cfr = true, try_sendfile = true, try_splice = true; |
0254b455 | 73 | int r; |
7c2da2ca | 74 | size_t m = SSIZE_MAX; /* that is the maximum that sendfile and c_f_r accept */ |
cda134ab | 75 | |
849958d1 LP |
76 | assert(fdf >= 0); |
77 | assert(fdt >= 0); | |
78 | ||
0254b455 | 79 | /* Try btrfs reflinks first. */ |
c622fbdb LP |
80 | if (try_reflink && |
81 | max_bytes == (uint64_t) -1 && | |
82 | lseek(fdf, 0, SEEK_CUR) == 0 && | |
83 | lseek(fdt, 0, SEEK_CUR) == 0) { | |
84 | ||
0254b455 LP |
85 | r = btrfs_reflink(fdf, fdt); |
86 | if (r >= 0) | |
f6d9c616 | 87 | return 0; /* we copied the whole thing, hence hit EOF, return 0 */ |
0254b455 LP |
88 | } |
89 | ||
849958d1 | 90 | for (;;) { |
cda134ab | 91 | ssize_t n; |
93240d3a | 92 | |
59f448cf | 93 | if (max_bytes != (uint64_t) -1) { |
93240d3a | 94 | if (max_bytes <= 0) |
f6d9c616 | 95 | return 1; /* return > 0 if we hit the max_bytes limit */ |
93240d3a | 96 | |
d219849e ZJS |
97 | if (m > max_bytes) |
98 | m = max_bytes; | |
93240d3a LP |
99 | } |
100 | ||
a44202e9 ZJS |
101 | /* First try copy_file_range(), unless we already tried */ |
102 | if (try_cfr) { | |
103 | n = try_copy_file_range(fdf, NULL, fdt, NULL, m, 0u); | |
104 | if (n < 0) { | |
6402d5c6 | 105 | if (!IN_SET(n, -EINVAL, -ENOSYS, -EXDEV, -EBADF)) |
a44202e9 ZJS |
106 | return n; |
107 | ||
108 | try_cfr = false; | |
109 | /* use fallback below */ | |
110 | } else if (n == 0) /* EOF */ | |
111 | break; | |
112 | else | |
113 | /* Success! */ | |
114 | goto next; | |
115 | } | |
116 | ||
cda134ab LP |
117 | /* First try sendfile(), unless we already tried */ |
118 | if (try_sendfile) { | |
cda134ab LP |
119 | n = sendfile(fdt, fdf, NULL, m); |
120 | if (n < 0) { | |
00a8cf77 | 121 | if (!IN_SET(errno, EINVAL, ENOSYS)) |
cda134ab LP |
122 | return -errno; |
123 | ||
124 | try_sendfile = false; | |
125 | /* use fallback below */ | |
126 | } else if (n == 0) /* EOF */ | |
127 | break; | |
00a8cf77 | 128 | else |
81d20007 LP |
129 | /* Success! */ |
130 | goto next; | |
131 | } | |
132 | ||
00a8cf77 | 133 | /* Then try splice, unless we already tried */ |
81d20007 | 134 | if (try_splice) { |
f6d9c616 | 135 | n = splice(fdf, NULL, fdt, NULL, m, 0); |
81d20007 | 136 | if (n < 0) { |
00a8cf77 | 137 | if (!IN_SET(errno, EINVAL, ENOSYS)) |
81d20007 LP |
138 | return -errno; |
139 | ||
140 | try_splice = false; | |
141 | /* use fallback below */ | |
142 | } else if (n == 0) /* EOF */ | |
143 | break; | |
00a8cf77 | 144 | else |
81d20007 | 145 | /* Success! */ |
cda134ab LP |
146 | goto next; |
147 | } | |
148 | ||
149 | /* As a fallback just copy bits by hand */ | |
150 | { | |
00a8cf77 | 151 | uint8_t buf[MIN(m, COPY_BUFFER_SIZE)]; |
849958d1 | 152 | |
00a8cf77 | 153 | n = read(fdf, buf, sizeof buf); |
cda134ab LP |
154 | if (n < 0) |
155 | return -errno; | |
156 | if (n == 0) /* EOF */ | |
157 | break; | |
158 | ||
0254b455 | 159 | r = loop_write(fdt, buf, (size_t) n, false); |
553acb7b ZJS |
160 | if (r < 0) |
161 | return r; | |
cda134ab | 162 | } |
93240d3a | 163 | |
cda134ab | 164 | next: |
59f448cf LP |
165 | if (max_bytes != (uint64_t) -1) { |
166 | assert(max_bytes >= (uint64_t) n); | |
93240d3a LP |
167 | max_bytes -= n; |
168 | } | |
00a8cf77 ZJS |
169 | /* sendfile accepts at most SSIZE_MAX-offset bytes to copy, |
170 | * so reduce our maximum by the amount we already copied, | |
171 | * but don't go below our copy buffer size, unless we are | |
61233823 | 172 | * close the limit of bytes we are allowed to copy. */ |
00a8cf77 | 173 | m = MAX(MIN(COPY_BUFFER_SIZE, max_bytes), m - n); |
849958d1 LP |
174 | } |
175 | ||
f6d9c616 | 176 | return 0; /* return 0 if we hit EOF earlier than the size limit */ |
849958d1 LP |
177 | } |
178 | ||
179 | static int fd_copy_symlink(int df, const char *from, const struct stat *st, int dt, const char *to) { | |
180 | _cleanup_free_ char *target = NULL; | |
181 | int r; | |
182 | ||
183 | assert(from); | |
184 | assert(st); | |
185 | assert(to); | |
186 | ||
187 | r = readlinkat_malloc(df, from, &target); | |
188 | if (r < 0) | |
189 | return r; | |
190 | ||
e156347e | 191 | if (symlinkat(target, dt, to) < 0) |
849958d1 | 192 | return -errno; |
849958d1 LP |
193 | |
194 | if (fchownat(dt, to, st->st_uid, st->st_gid, AT_SYMLINK_NOFOLLOW) < 0) | |
195 | return -errno; | |
196 | ||
197 | return 0; | |
198 | } | |
199 | ||
200 | static int fd_copy_regular(int df, const char *from, const struct stat *st, int dt, const char *to) { | |
201 | _cleanup_close_ int fdf = -1, fdt = -1; | |
ebd93cb6 | 202 | struct timespec ts[2]; |
849958d1 LP |
203 | int r, q; |
204 | ||
205 | assert(from); | |
206 | assert(st); | |
207 | assert(to); | |
208 | ||
209 | fdf = openat(df, from, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW); | |
210 | if (fdf < 0) | |
211 | return -errno; | |
212 | ||
213 | fdt = openat(dt, to, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, st->st_mode & 07777); | |
e156347e | 214 | if (fdt < 0) |
849958d1 | 215 | return -errno; |
849958d1 | 216 | |
59f448cf | 217 | r = copy_bytes(fdf, fdt, (uint64_t) -1, true); |
849958d1 LP |
218 | if (r < 0) { |
219 | unlinkat(dt, to, 0); | |
220 | return r; | |
221 | } | |
222 | ||
223 | if (fchown(fdt, st->st_uid, st->st_gid) < 0) | |
224 | r = -errno; | |
225 | ||
226 | if (fchmod(fdt, st->st_mode & 07777) < 0) | |
227 | r = -errno; | |
228 | ||
ebd93cb6 LP |
229 | ts[0] = st->st_atim; |
230 | ts[1] = st->st_mtim; | |
231 | (void) futimens(fdt, ts); | |
232 | ||
e6bd041c LP |
233 | (void) copy_xattr(fdf, fdt); |
234 | ||
849958d1 LP |
235 | q = close(fdt); |
236 | fdt = -1; | |
237 | ||
238 | if (q < 0) { | |
239 | r = -errno; | |
240 | unlinkat(dt, to, 0); | |
241 | } | |
242 | ||
243 | return r; | |
244 | } | |
245 | ||
246 | static int fd_copy_fifo(int df, const char *from, const struct stat *st, int dt, const char *to) { | |
247 | int r; | |
248 | ||
249 | assert(from); | |
250 | assert(st); | |
251 | assert(to); | |
252 | ||
253 | r = mkfifoat(dt, to, st->st_mode & 07777); | |
e156347e | 254 | if (r < 0) |
849958d1 | 255 | return -errno; |
849958d1 LP |
256 | |
257 | if (fchownat(dt, to, st->st_uid, st->st_gid, AT_SYMLINK_NOFOLLOW) < 0) | |
258 | r = -errno; | |
259 | ||
260 | if (fchmodat(dt, to, st->st_mode & 07777, 0) < 0) | |
261 | r = -errno; | |
262 | ||
263 | return r; | |
264 | } | |
265 | ||
266 | static int fd_copy_node(int df, const char *from, const struct stat *st, int dt, const char *to) { | |
267 | int r; | |
268 | ||
269 | assert(from); | |
270 | assert(st); | |
271 | assert(to); | |
272 | ||
273 | r = mknodat(dt, to, st->st_mode, st->st_rdev); | |
e156347e | 274 | if (r < 0) |
849958d1 | 275 | return -errno; |
849958d1 LP |
276 | |
277 | if (fchownat(dt, to, st->st_uid, st->st_gid, AT_SYMLINK_NOFOLLOW) < 0) | |
278 | r = -errno; | |
279 | ||
280 | if (fchmodat(dt, to, st->st_mode & 07777, 0) < 0) | |
281 | r = -errno; | |
282 | ||
283 | return r; | |
284 | } | |
285 | ||
d7c7c334 LP |
286 | static int fd_copy_directory( |
287 | int df, | |
288 | const char *from, | |
289 | const struct stat *st, | |
290 | int dt, | |
291 | const char *to, | |
292 | dev_t original_device, | |
293 | bool merge) { | |
294 | ||
849958d1 LP |
295 | _cleanup_close_ int fdf = -1, fdt = -1; |
296 | _cleanup_closedir_ DIR *d = NULL; | |
297 | struct dirent *de; | |
298 | bool created; | |
299 | int r; | |
300 | ||
849958d1 LP |
301 | assert(st); |
302 | assert(to); | |
303 | ||
d7c7c334 LP |
304 | if (from) |
305 | fdf = openat(df, from, O_RDONLY|O_DIRECTORY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW); | |
306 | else | |
307 | fdf = fcntl(df, F_DUPFD_CLOEXEC, 3); | |
b498c53d LP |
308 | if (fdf < 0) |
309 | return -errno; | |
849958d1 LP |
310 | |
311 | d = fdopendir(fdf); | |
312 | if (!d) | |
313 | return -errno; | |
314 | fdf = -1; | |
315 | ||
316 | r = mkdirat(dt, to, st->st_mode & 07777); | |
317 | if (r >= 0) | |
318 | created = true; | |
e156347e | 319 | else if (errno == EEXIST && merge) |
849958d1 LP |
320 | created = false; |
321 | else | |
322 | return -errno; | |
323 | ||
324 | fdt = openat(dt, to, O_RDONLY|O_DIRECTORY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW); | |
325 | if (fdt < 0) | |
326 | return -errno; | |
327 | ||
2c455af4 LP |
328 | r = 0; |
329 | ||
8420fa3a | 330 | FOREACH_DIRENT_ALL(de, d, return -errno) { |
849958d1 LP |
331 | struct stat buf; |
332 | int q; | |
333 | ||
49bfc877 | 334 | if (dot_or_dot_dot(de->d_name)) |
8420fa3a LP |
335 | continue; |
336 | ||
849958d1 LP |
337 | if (fstatat(dirfd(d), de->d_name, &buf, AT_SYMLINK_NOFOLLOW) < 0) { |
338 | r = -errno; | |
339 | continue; | |
340 | } | |
341 | ||
342 | if (buf.st_dev != original_device) | |
343 | continue; | |
344 | ||
345 | if (S_ISREG(buf.st_mode)) | |
346 | q = fd_copy_regular(dirfd(d), de->d_name, &buf, fdt, de->d_name); | |
347 | else if (S_ISDIR(buf.st_mode)) | |
e156347e | 348 | q = fd_copy_directory(dirfd(d), de->d_name, &buf, fdt, de->d_name, original_device, merge); |
849958d1 LP |
349 | else if (S_ISLNK(buf.st_mode)) |
350 | q = fd_copy_symlink(dirfd(d), de->d_name, &buf, fdt, de->d_name); | |
351 | else if (S_ISFIFO(buf.st_mode)) | |
352 | q = fd_copy_fifo(dirfd(d), de->d_name, &buf, fdt, de->d_name); | |
0e2b2cac | 353 | else if (S_ISBLK(buf.st_mode) || S_ISCHR(buf.st_mode) || S_ISSOCK(buf.st_mode)) |
849958d1 LP |
354 | q = fd_copy_node(dirfd(d), de->d_name, &buf, fdt, de->d_name); |
355 | else | |
15411c0c | 356 | q = -EOPNOTSUPP; |
849958d1 | 357 | |
e156347e LP |
358 | if (q == -EEXIST && merge) |
359 | q = 0; | |
360 | ||
849958d1 LP |
361 | if (q < 0) |
362 | r = q; | |
363 | } | |
364 | ||
3b8483c0 LP |
365 | if (created) { |
366 | struct timespec ut[2] = { | |
367 | st->st_atim, | |
368 | st->st_mtim | |
369 | }; | |
370 | ||
371 | if (fchown(fdt, st->st_uid, st->st_gid) < 0) | |
372 | r = -errno; | |
373 | ||
374 | if (fchmod(fdt, st->st_mode & 07777) < 0) | |
375 | r = -errno; | |
376 | ||
377 | (void) copy_xattr(dirfd(d), fdt); | |
378 | (void) futimens(fdt, ut); | |
379 | } | |
380 | ||
849958d1 LP |
381 | return r; |
382 | } | |
383 | ||
f2cbe59e | 384 | int copy_tree_at(int fdf, const char *from, int fdt, const char *to, bool merge) { |
849958d1 LP |
385 | struct stat st; |
386 | ||
387 | assert(from); | |
388 | assert(to); | |
389 | ||
f2cbe59e | 390 | if (fstatat(fdf, from, &st, AT_SYMLINK_NOFOLLOW) < 0) |
849958d1 LP |
391 | return -errno; |
392 | ||
393 | if (S_ISREG(st.st_mode)) | |
f2cbe59e | 394 | return fd_copy_regular(fdf, from, &st, fdt, to); |
849958d1 | 395 | else if (S_ISDIR(st.st_mode)) |
f2cbe59e | 396 | return fd_copy_directory(fdf, from, &st, fdt, to, st.st_dev, merge); |
849958d1 | 397 | else if (S_ISLNK(st.st_mode)) |
f2cbe59e | 398 | return fd_copy_symlink(fdf, from, &st, fdt, to); |
849958d1 | 399 | else if (S_ISFIFO(st.st_mode)) |
f2cbe59e | 400 | return fd_copy_fifo(fdf, from, &st, fdt, to); |
0e2b2cac | 401 | else if (S_ISBLK(st.st_mode) || S_ISCHR(st.st_mode) || S_ISSOCK(st.st_mode)) |
f2cbe59e | 402 | return fd_copy_node(fdf, from, &st, fdt, to); |
849958d1 | 403 | else |
15411c0c | 404 | return -EOPNOTSUPP; |
849958d1 LP |
405 | } |
406 | ||
f2cbe59e LP |
407 | int copy_tree(const char *from, const char *to, bool merge) { |
408 | return copy_tree_at(AT_FDCWD, from, AT_FDCWD, to, merge); | |
409 | } | |
410 | ||
411 | int copy_directory_fd(int dirfd, const char *to, bool merge) { | |
d7c7c334 LP |
412 | struct stat st; |
413 | ||
414 | assert(dirfd >= 0); | |
415 | assert(to); | |
416 | ||
417 | if (fstat(dirfd, &st) < 0) | |
418 | return -errno; | |
419 | ||
420 | if (!S_ISDIR(st.st_mode)) | |
421 | return -ENOTDIR; | |
422 | ||
423 | return fd_copy_directory(dirfd, NULL, &st, AT_FDCWD, to, st.st_dev, merge); | |
424 | } | |
425 | ||
9a50e3ca LP |
426 | int copy_directory(const char *from, const char *to, bool merge) { |
427 | struct stat st; | |
428 | ||
429 | assert(from); | |
430 | assert(to); | |
431 | ||
432 | if (lstat(from, &st) < 0) | |
433 | return -errno; | |
434 | ||
435 | if (!S_ISDIR(st.st_mode)) | |
436 | return -ENOTDIR; | |
437 | ||
438 | return fd_copy_directory(AT_FDCWD, from, &st, AT_FDCWD, to, st.st_dev, merge); | |
439 | } | |
440 | ||
7430ec6a | 441 | int copy_file_fd(const char *from, int fdt, bool try_reflink) { |
cda134ab | 442 | _cleanup_close_ int fdf = -1; |
e6bd041c | 443 | int r; |
849958d1 LP |
444 | |
445 | assert(from); | |
cda134ab | 446 | assert(fdt >= 0); |
849958d1 LP |
447 | |
448 | fdf = open(from, O_RDONLY|O_CLOEXEC|O_NOCTTY); | |
449 | if (fdf < 0) | |
450 | return -errno; | |
451 | ||
59f448cf | 452 | r = copy_bytes(fdf, fdt, (uint64_t) -1, try_reflink); |
e6bd041c LP |
453 | |
454 | (void) copy_times(fdf, fdt); | |
455 | (void) copy_xattr(fdf, fdt); | |
456 | ||
457 | return r; | |
cda134ab LP |
458 | } |
459 | ||
45030287 | 460 | int copy_file(const char *from, const char *to, int flags, mode_t mode, unsigned chattr_flags) { |
a7f7d1bd | 461 | int fdt = -1, r; |
cda134ab LP |
462 | |
463 | assert(from); | |
464 | assert(to); | |
465 | ||
ebd93cb6 LP |
466 | RUN_WITH_UMASK(0000) { |
467 | fdt = open(to, flags|O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY, mode); | |
468 | if (fdt < 0) | |
469 | return -errno; | |
470 | } | |
849958d1 | 471 | |
f2068bcc | 472 | if (chattr_flags != 0) |
1ed8f8c1 | 473 | (void) chattr_fd(fdt, chattr_flags, (unsigned) -1); |
f2068bcc | 474 | |
7430ec6a | 475 | r = copy_file_fd(from, fdt, true); |
849958d1 | 476 | if (r < 0) { |
cda134ab | 477 | close(fdt); |
849958d1 LP |
478 | unlink(to); |
479 | return r; | |
480 | } | |
481 | ||
cda134ab LP |
482 | if (close(fdt) < 0) { |
483 | unlink_noerrno(to); | |
484 | return -errno; | |
849958d1 LP |
485 | } |
486 | ||
487 | return 0; | |
488 | } | |
e6bd041c | 489 | |
45030287 | 490 | int copy_file_atomic(const char *from, const char *to, mode_t mode, bool replace, unsigned chattr_flags) { |
a7f7d1bd | 491 | _cleanup_free_ char *t = NULL; |
ebd93cb6 LP |
492 | int r; |
493 | ||
494 | assert(from); | |
495 | assert(to); | |
496 | ||
14bcf25c | 497 | r = tempfn_random(to, NULL, &t); |
ebd93cb6 LP |
498 | if (r < 0) |
499 | return r; | |
500 | ||
f2068bcc | 501 | r = copy_file(from, t, O_NOFOLLOW|O_EXCL, mode, chattr_flags); |
ebd93cb6 LP |
502 | if (r < 0) |
503 | return r; | |
504 | ||
f85ef957 AC |
505 | if (replace) { |
506 | r = renameat(AT_FDCWD, t, AT_FDCWD, to); | |
507 | if (r < 0) | |
508 | r = -errno; | |
509 | } else | |
510 | r = rename_noreplace(AT_FDCWD, t, AT_FDCWD, to); | |
511 | if (r < 0) { | |
512 | (void) unlink_noerrno(t); | |
513 | return r; | |
ebd93cb6 LP |
514 | } |
515 | ||
516 | return 0; | |
517 | } | |
518 | ||
e6bd041c LP |
519 | int copy_times(int fdf, int fdt) { |
520 | struct timespec ut[2]; | |
521 | struct stat st; | |
a7f7d1bd | 522 | usec_t crtime = 0; |
e6bd041c LP |
523 | |
524 | assert(fdf >= 0); | |
525 | assert(fdt >= 0); | |
526 | ||
527 | if (fstat(fdf, &st) < 0) | |
528 | return -errno; | |
529 | ||
530 | ut[0] = st.st_atim; | |
531 | ut[1] = st.st_mtim; | |
532 | ||
533 | if (futimens(fdt, ut) < 0) | |
534 | return -errno; | |
535 | ||
536 | if (fd_getcrtime(fdf, &crtime) >= 0) | |
537 | (void) fd_setcrtime(fdt, crtime); | |
538 | ||
539 | return 0; | |
540 | } | |
541 | ||
542 | int copy_xattr(int fdf, int fdt) { | |
543 | _cleanup_free_ char *bufa = NULL, *bufb = NULL; | |
544 | size_t sza = 100, szb = 100; | |
545 | ssize_t n; | |
546 | int ret = 0; | |
547 | const char *p; | |
548 | ||
549 | for (;;) { | |
550 | bufa = malloc(sza); | |
551 | if (!bufa) | |
552 | return -ENOMEM; | |
553 | ||
554 | n = flistxattr(fdf, bufa, sza); | |
555 | if (n == 0) | |
556 | return 0; | |
557 | if (n > 0) | |
558 | break; | |
559 | if (errno != ERANGE) | |
560 | return -errno; | |
561 | ||
562 | sza *= 2; | |
563 | ||
97b11eed | 564 | bufa = mfree(bufa); |
e6bd041c LP |
565 | } |
566 | ||
567 | p = bufa; | |
568 | while (n > 0) { | |
569 | size_t l; | |
570 | ||
571 | l = strlen(p); | |
572 | assert(l < (size_t) n); | |
573 | ||
574 | if (startswith(p, "user.")) { | |
575 | ssize_t m; | |
576 | ||
577 | if (!bufb) { | |
578 | bufb = malloc(szb); | |
579 | if (!bufb) | |
580 | return -ENOMEM; | |
581 | } | |
582 | ||
583 | m = fgetxattr(fdf, p, bufb, szb); | |
584 | if (m < 0) { | |
585 | if (errno == ERANGE) { | |
586 | szb *= 2; | |
97b11eed | 587 | bufb = mfree(bufb); |
e6bd041c LP |
588 | continue; |
589 | } | |
590 | ||
591 | return -errno; | |
592 | } | |
593 | ||
594 | if (fsetxattr(fdt, p, bufb, m, 0) < 0) | |
595 | ret = -errno; | |
596 | } | |
597 | ||
598 | p += l + 1; | |
599 | n -= l + 1; | |
600 | } | |
601 | ||
602 | return ret; | |
603 | } |