1: /*
2: * Syscall wrappers to ensure that nothing gets done in dry_run mode
3: * and to handle system peculiarities.
4: *
5: * Copyright (C) 1998 Andrew Tridgell
6: * Copyright (C) 2002 Martin Pool
7: * Copyright (C) 2003-2020 Wayne Davison
8: *
9: * This program is free software; you can redistribute it and/or modify
10: * it under the terms of the GNU General Public License as published by
11: * the Free Software Foundation; either version 3 of the License, or
12: * (at your option) any later version.
13: *
14: * This program is distributed in the hope that it will be useful,
15: * but WITHOUT ANY WARRANTY; without even the implied warranty of
16: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17: * GNU General Public License for more details.
18: *
19: * You should have received a copy of the GNU General Public License along
20: * with this program; if not, visit the http://fsf.org website.
21: */
22:
23: #include "rsync.h"
24:
25: #if !defined MKNOD_CREATES_SOCKETS && defined HAVE_SYS_UN_H
26: #include <sys/un.h>
27: #endif
28: #ifdef HAVE_SYS_ATTR_H
29: #include <sys/attr.h>
30: #endif
31:
32: #if defined HAVE_SYS_FALLOCATE && !defined HAVE_FALLOCATE
33: #include <sys/syscall.h>
34: #endif
35:
36: extern int dry_run;
37: extern int am_root;
38: extern int am_sender;
39: extern int read_only;
40: extern int list_only;
41: extern int force_change;
42: extern int inplace;
43: extern int preallocate_files;
44: extern int preserve_perms;
45: extern int preserve_executability;
46: extern int open_noatime;
47:
48: int direct_io = 0;
49:
50: #ifndef S_BLKSIZE
51: # if defined hpux || defined __hpux__ || defined __hpux
52: # define S_BLKSIZE 1024
53: # elif defined _AIX && defined _I386
54: # define S_BLKSIZE 4096
55: # else
56: # define S_BLKSIZE 512
57: # endif
58: #endif
59:
60: #ifdef SUPPORT_CRTIMES
61: #pragma pack(push, 4)
62: struct create_time {
63: uint32 length;
64: struct timespec crtime;
65: };
66: #pragma pack(pop)
67: #endif
68:
69: #define RETURN_ERROR_IF(x,e) \
70: do { \
71: if (x) { \
72: errno = (e); \
73: return -1; \
74: } \
75: } while (0)
76:
77: #define RETURN_ERROR_IF_RO_OR_LO RETURN_ERROR_IF(read_only || list_only, EROFS)
78:
79: int do_unlink(const char *fname)
80: {
81: if (dry_run) return 0;
82: RETURN_ERROR_IF_RO_OR_LO;
83: if (unlink(fname) == 0)
84: return 0;
85: #ifdef SUPPORT_FORCE_CHANGE
86: if (force_change && errno == EPERM) {
87: STRUCT_STAT st;
88:
89: if (x_lstat(fname, &st, NULL) == 0
90: && make_mutable(fname, st.st_mode, st.st_flags, force_change) > 0) {
91: if (unlink(fname) == 0)
92: return 0;
93: undo_make_mutable(fname, st.st_flags);
94: }
95: /* TODO: handle immutable directories */
96: errno = EPERM;
97: }
98: #endif
99: return -1;
100: }
101:
102: #ifdef SUPPORT_LINKS
103: int do_symlink(const char *lnk, const char *fname)
104: {
105: if (dry_run) return 0;
106: RETURN_ERROR_IF_RO_OR_LO;
107:
108: #if defined NO_SYMLINK_XATTRS || defined NO_SYMLINK_USER_XATTRS
109: /* For --fake-super, we create a normal file with mode 0600
110: * and write the lnk into it. */
111: if (am_root < 0) {
112: int ok, len = strlen(lnk);
113: int flags = O_WRONLY|O_CREAT|O_TRUNC;
114:
115: if (direct_io)
116: flags |= O_DIRECT;
117:
118: int fd = open(fname, flags, S_IWUSR|S_IRUSR);
119: if (fd < 0)
120: return -1;
121: ok = write(fd, lnk, len) == len;
122: if (close(fd) < 0)
123: ok = 0;
124: return ok ? 0 : -1;
125: }
126: #endif
127:
128: return symlink(lnk, fname);
129: }
130:
131: #if defined NO_SYMLINK_XATTRS || defined NO_SYMLINK_USER_XATTRS
132: ssize_t do_readlink(const char *path, char *buf, size_t bufsiz)
133: {
134: /* For --fake-super, we read the link from the file. */
135: if (am_root < 0) {
136: int fd = do_open_nofollow(path, O_RDONLY);
137: if (fd >= 0) {
138: int len = read(fd, buf, bufsiz);
139: close(fd);
140: return len;
141: }
142: if (errno != ELOOP)
143: return -1;
144: /* A real symlink needs to be turned into a fake one on the receiving
145: * side, so tell the generator that the link has no length. */
146: if (!am_sender)
147: return 0;
148: /* Otherwise fall through and let the sender report the real length. */
149: }
150:
151: return readlink(path, buf, bufsiz);
152: }
153: #endif
154: #endif
155:
156: #if defined HAVE_LINK || defined HAVE_LINKAT
157: int do_link(const char *old_path, const char *new_path)
158: {
159: int st;
160:
161: if (dry_run) return 0;
162: RETURN_ERROR_IF_RO_OR_LO;
163: #ifdef HAVE_LINKAT
164: st = linkat(AT_FDCWD, old_path, AT_FDCWD, new_path, 0);
165: #else
166: st = link(old_path, new_path);
167: #endif
168: if (/*soften_links &&*/ st != 0 && errno == EXDEV)
169: st = symlink(old_path, new_path);
170: return st;
171: }
172: #endif
173:
174: int do_clone(const char *old_path, const char *new_path, mode_t mode)
175: {
176: #ifdef FICLONE
177: int ifd, ofd, ret, save_errno;
178:
179: if (dry_run) return 0;
180: RETURN_ERROR_IF_RO_OR_LO;
181:
182: if ((ifd = do_open(old_path, O_RDONLY, 0)) < 0) {
183: save_errno = errno;
184: rsyserr(FERROR_XFER, errno, "open %s", full_fname(old_path));
185: errno = save_errno;
186: return -1;
187: }
188:
189: if (robust_unlink(new_path) && errno != ENOENT) {
190: save_errno = errno;
191: rsyserr(FERROR_XFER, errno, "unlink %s", full_fname(new_path));
192: close(ifd);
193: errno = save_errno;
194: return -1;
195: }
196:
197: mode &= INITACCESSPERMS;
198: if ((ofd = do_open(new_path, O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, mode)) < 0) {
199: save_errno = errno;
200: rsyserr(FERROR_XFER, save_errno, "open %s", full_fname(new_path));
201: close(ifd);
202: errno = save_errno;
203: return -1;
204: }
205:
206: ret = ioctl(ofd, FICLONE, ifd);
207: save_errno = errno;
208: close(ifd);
209: close(ofd);
210: if (ret < 0)
211: unlink(new_path);
212: errno = save_errno;
213: return ret;
214: #else
215: (void)old_path;
216: (void)new_path;
217: errno = ENOTSUP;
218: return -1;
219: #endif
220: }
221:
222: int do_lchown(const char *path, uid_t owner, gid_t group, UNUSED(mode_t mode), UNUSED(uint32 fileflags))
223: {
224: if (dry_run) return 0;
225: RETURN_ERROR_IF_RO_OR_LO;
226: #ifndef HAVE_LCHOWN
227: #define lchown chown
228: #endif
229: if (lchown(path, owner, group) == 0)
230: return 0;
231: #ifdef SUPPORT_FORCE_CHANGE
232: if (force_change && errno == EPERM) {
233: if (fileflags == NO_FFLAGS) {
234: STRUCT_STAT st;
235: if (x_lstat(path, &st, NULL) == 0) {
236: mode = st.st_mode;
237: fileflags = st.st_flags;
238: }
239: }
240: if (fileflags != NO_FFLAGS
241: && make_mutable(path, mode, fileflags, force_change) > 0) {
242: int ret = lchown(path, owner, group);
243: undo_make_mutable(path, fileflags);
244: if (ret == 0)
245: return 0;
246: }
247: errno = EPERM;
248: }
249: #endif
250: return -1;
251: }
252:
253: int do_mknod(const char *pathname, mode_t mode, dev_t dev)
254: {
255: if (dry_run) return 0;
256: RETURN_ERROR_IF_RO_OR_LO;
257:
258: /* For --fake-super, we create a normal file with mode 0600. */
259: if (am_root < 0) {
260: int fd = open(pathname, O_WRONLY|O_CREAT|O_TRUNC, S_IWUSR|S_IRUSR);
261: if (fd < 0 || close(fd) < 0)
262: return -1;
263: return 0;
264: }
265:
266: #if !defined MKNOD_CREATES_FIFOS && defined HAVE_MKFIFO
267: if (S_ISFIFO(mode))
268: return mkfifo(pathname, mode);
269: #endif
270: #if !defined MKNOD_CREATES_SOCKETS && defined HAVE_SYS_UN_H
271: if (S_ISSOCK(mode)) {
272: int sock;
273: struct sockaddr_un saddr;
274: unsigned int len = strlcpy(saddr.sun_path, pathname, sizeof saddr.sun_path);
275: if (len >= sizeof saddr.sun_path) {
276: errno = ENAMETOOLONG;
277: return -1;
278: }
279: #ifdef HAVE_SOCKADDR_UN_LEN
280: saddr.sun_len = len + 1;
281: #endif
282: saddr.sun_family = AF_UNIX;
283:
284: if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0
285: || (unlink(pathname) < 0 && errno != ENOENT)
286: || (bind(sock, (struct sockaddr*)&saddr, sizeof saddr)) < 0)
287: return -1;
288: close(sock);
289: #ifdef HAVE_CHMOD
290: return do_chmod(pathname, mode, 0);
291: #else
292: return 0;
293: #endif
294: }
295: #endif
296: #ifdef HAVE_MKNOD
297: return mknod(pathname, mode, dev);
298: #else
299: return -1;
300: #endif
301: }
302:
303: int do_rmdir(const char *pathname)
304: {
305: if (dry_run) return 0;
306: RETURN_ERROR_IF_RO_OR_LO;
307: if (rmdir(pathname) == 0)
308: return 0;
309: #ifdef SUPPORT_FORCE_CHANGE
310: if (force_change && errno == EPERM) {
311: STRUCT_STAT st;
312:
313: if (x_lstat(pathname, &st, NULL) == 0
314: && make_mutable(pathname, st.st_mode, st.st_flags, force_change) > 0) {
315: if (rmdir(pathname) == 0)
316: return 0;
317: undo_make_mutable(pathname, st.st_flags);
318: }
319: errno = EPERM;
320: }
321: #endif
322: return -1;
323: }
324:
325: int do_open(const char *pathname, int flags, mode_t mode)
326: {
327: if (flags != O_RDONLY) {
328: RETURN_ERROR_IF(dry_run, 0);
329: RETURN_ERROR_IF_RO_OR_LO;
330: }
331:
332: #ifdef O_NOATIME
333: if (open_noatime)
334: flags |= O_NOATIME;
335: #endif
336: if (direct_io)
337: flags |= O_DIRECT;
338:
339: return open(pathname, flags | O_BINARY, mode);
340: }
341:
342: #ifdef HAVE_CHMOD
343: int do_chmod(const char *path, mode_t mode, UNUSED(uint32 fileflags))
344: {
345: int code;
346: if (dry_run) return 0;
347: RETURN_ERROR_IF_RO_OR_LO;
348: #ifdef HAVE_LCHMOD
349: code = lchmod(path, mode & CHMOD_BITS);
350: #else
351: if (S_ISLNK(mode)) {
352: # if defined HAVE_SETATTRLIST
353: struct attrlist attrList;
354: uint32_t m = mode & CHMOD_BITS; /* manpage is wrong: not mode_t! */
355:
356: memset(&attrList, 0, sizeof attrList);
357: attrList.bitmapcount = ATTR_BIT_MAP_COUNT;
358: attrList.commonattr = ATTR_CMN_ACCESSMASK;
359: code = setattrlist(path, &attrList, &m, sizeof m, FSOPT_NOFOLLOW);
360: # else
361: code = 1;
362: # endif
363: } else
364: code = chmod(path, mode & CHMOD_BITS); /* DISCOURAGED FUNCTION */
365: #endif /* !HAVE_LCHMOD */
366: #ifdef SUPPORT_FORCE_CHANGE
367: if (code < 0 && force_change && errno == EPERM && !S_ISLNK(mode)) {
368: if (fileflags == NO_FFLAGS) {
369: STRUCT_STAT st;
370: if (x_lstat(path, &st, NULL) == 0)
371: fileflags = st.st_flags;
372: }
373: if (fileflags != NO_FFLAGS
374: && make_mutable(path, mode, fileflags, force_change) > 0) {
375: code = chmod(path, mode & CHMOD_BITS);
376: undo_make_mutable(path, fileflags);
377: if (code == 0)
378: return 0;
379: }
380: errno = EPERM;
381: }
382: #endif
383: if (code != 0 && (preserve_perms || preserve_executability))
384: return code;
385: return 0;
386: }
387: #endif
388:
389: #ifdef HAVE_CHFLAGS
390: int do_chflags(const char *path, uint32 fileflags)
391: {
392: if (dry_run) return 0;
393: RETURN_ERROR_IF_RO_OR_LO;
394: return chflags(path, fileflags);
395: }
396: #endif
397:
398: int do_rename(const char *old_path, const char *new_path)
399: {
400: if (dry_run) return 0;
401: RETURN_ERROR_IF_RO_OR_LO;
402: if (rename(old_path, new_path) == 0)
403: return 0;
404: #ifdef SUPPORT_FORCE_CHANGE
405: if (force_change && errno == EPERM) {
406: STRUCT_STAT st1, st2;
407: int became_mutable;
408:
409: if (x_lstat(old_path, &st1, NULL) != 0)
410: goto failed;
411: became_mutable = make_mutable(old_path, st1.st_mode, st1.st_flags, force_change) > 0;
412: if (became_mutable && rename(old_path, new_path) == 0)
413: goto success;
414: if (x_lstat(new_path, &st2, NULL) == 0
415: && make_mutable(new_path, st2.st_mode, st2.st_flags, force_change) > 0) {
416: if (rename(old_path, new_path) == 0) {
417: success:
418: if (became_mutable) /* Yes, use new_path and st1! */
419: undo_make_mutable(new_path, st1.st_flags);
420: return 0;
421: }
422: undo_make_mutable(new_path, st2.st_flags);
423: }
424: /* TODO: handle immutable directories */
425: if (became_mutable)
426: undo_make_mutable(old_path, st1.st_flags);
427: failed:
428: errno = EPERM;
429: }
430: #endif
431: return -1;
432: }
433:
434: #ifdef HAVE_FTRUNCATE
435: int do_ftruncate(int fd, OFF_T size)
436: {
437: int ret;
438:
439: if (dry_run) return 0;
440: RETURN_ERROR_IF_RO_OR_LO;
441:
442: do {
443: ret = ftruncate(fd, size);
444: } while (ret < 0 && errno == EINTR);
445:
446: return ret;
447: }
448: #endif
449:
450: void trim_trailing_slashes(char *name)
451: {
452: int l;
453: /* Some BSD systems cannot make a directory if the name
454: * contains a trailing slash.
455: * <http://www.opensource.apple.com/bugs/X/BSD%20Kernel/2734739.html> */
456:
457: /* Don't change empty string; and also we can't improve on
458: * "/" */
459:
460: l = strlen(name);
461: while (l > 1) {
462: if (name[--l] != '/')
463: break;
464: name[l] = '\0';
465: }
466: }
467:
468: int do_mkdir(char *fname, mode_t mode)
469: {
470: if (dry_run) return 0;
471: RETURN_ERROR_IF_RO_OR_LO;
472: trim_trailing_slashes(fname);
473: return mkdir(fname, mode);
474: }
475:
476: /* like mkstemp but forces permissions */
477: int do_mkstemp(char *template, mode_t perms)
478: {
479: RETURN_ERROR_IF(dry_run, 0);
480: RETURN_ERROR_IF(read_only, EROFS);
481: perms |= S_IWUSR;
482:
483: #if defined HAVE_SECURE_MKSTEMP && defined HAVE_FCHMOD && (!defined HAVE_OPEN64 || defined HAVE_MKSTEMP64)
484: {
485: int fd = mkstemp(template);
486: if (fd == -1)
487: return -1;
488: if (fchmod(fd, perms) != 0 && preserve_perms) {
489: int errno_save = errno;
490: close(fd);
491: unlink(template);
492: errno = errno_save;
493: return -1;
494: }
495: #if defined HAVE_SETMODE && O_BINARY
496: setmode(fd, O_BINARY);
497: #endif
498: return fd;
499: }
500: #else
501: if (!mktemp(template))
502: return -1;
503: return do_open(template, O_RDWR|O_EXCL|O_CREAT, perms);
504: #endif
505: }
506:
507: int do_stat(const char *fname, STRUCT_STAT *st)
508: {
509: #ifdef USE_STAT64_FUNCS
510: return stat64(fname, st);
511: #else
512: return stat(fname, st);
513: #endif
514: }
515:
516: int do_lstat(const char *fname, STRUCT_STAT *st)
517: {
518: #ifdef SUPPORT_LINKS
519: # ifdef USE_STAT64_FUNCS
520: return lstat64(fname, st);
521: # else
522: return lstat(fname, st);
523: # endif
524: #else
525: return do_stat(fname, st);
526: #endif
527: }
528:
529: int do_fstat(int fd, STRUCT_STAT *st)
530: {
531: #ifdef USE_STAT64_FUNCS
532: return fstat64(fd, st);
533: #else
534: return fstat(fd, st);
535: #endif
536: }
537:
538: OFF_T do_lseek(int fd, OFF_T offset, int whence)
539: {
540: #ifdef HAVE_LSEEK64
541: #if !SIZEOF_OFF64_T
542: OFF_T lseek64();
543: #else
544: off64_t lseek64();
545: #endif
546: return lseek64(fd, offset, whence);
547: #else
548: return lseek(fd, offset, whence);
549: #endif
550: }
551:
552: #ifdef HAVE_SETATTRLIST
553: int do_setattrlist_times(const char *fname, STRUCT_STAT *stp)
554: {
555: struct attrlist attrList;
556: struct timespec ts;
557:
558: if (dry_run) return 0;
559: RETURN_ERROR_IF_RO_OR_LO;
560:
561: ts.tv_sec = stp->st_mtime;
562: ts.tv_nsec = stp->ST_MTIME_NSEC;
563:
564: memset(&attrList, 0, sizeof attrList);
565: attrList.bitmapcount = ATTR_BIT_MAP_COUNT;
566: attrList.commonattr = ATTR_CMN_MODTIME;
567: return setattrlist(fname, &attrList, &ts, sizeof ts, FSOPT_NOFOLLOW);
568: }
569: #endif
570:
571: #ifdef SUPPORT_CRTIMES
572: time_t get_create_time(const char *path)
573: {
574: static struct create_time attrBuf;
575: struct attrlist attrList;
576:
577: memset(&attrList, 0, sizeof attrList);
578: attrList.bitmapcount = ATTR_BIT_MAP_COUNT;
579: attrList.commonattr = ATTR_CMN_CRTIME;
580: if (getattrlist(path, &attrList, &attrBuf, sizeof attrBuf, FSOPT_NOFOLLOW) < 0)
581: return 0;
582: return attrBuf.crtime.tv_sec;
583: }
584: #endif
585:
586: #ifdef SUPPORT_CRTIMES
587: int set_create_time(const char *path, time_t crtime)
588: {
589: struct attrlist attrList;
590: struct timespec ts;
591:
592: if (dry_run) return 0;
593: RETURN_ERROR_IF_RO_OR_LO;
594:
595: ts.tv_sec = crtime;
596: ts.tv_nsec = 0;
597:
598: memset(&attrList, 0, sizeof attrList);
599: attrList.bitmapcount = ATTR_BIT_MAP_COUNT;
600: attrList.commonattr = ATTR_CMN_CRTIME;
601: return setattrlist(path, &attrList, &ts, sizeof ts, FSOPT_NOFOLLOW);
602: }
603: #endif
604:
605: #ifdef HAVE_UTIMENSAT
606: int do_utimensat(const char *fname, STRUCT_STAT *stp)
607: {
608: struct timespec t[2];
609:
610: if (dry_run) return 0;
611: RETURN_ERROR_IF_RO_OR_LO;
612:
613: t[0].tv_sec = stp->st_atime;
614: #ifdef ST_ATIME_NSEC
615: t[0].tv_nsec = stp->ST_ATIME_NSEC;
616: #else
617: t[0].tv_nsec = 0;
618: #endif
619: t[1].tv_sec = stp->st_mtime;
620: #ifdef ST_MTIME_NSEC
621: t[1].tv_nsec = stp->ST_MTIME_NSEC;
622: #else
623: t[1].tv_nsec = 0;
624: #endif
625: return utimensat(AT_FDCWD, fname, t, AT_SYMLINK_NOFOLLOW);
626: }
627: #endif
628:
629: #ifdef HAVE_LUTIMES
630: int do_lutimes(const char *fname, STRUCT_STAT *stp)
631: {
632: struct timeval t[2];
633:
634: if (dry_run) return 0;
635: RETURN_ERROR_IF_RO_OR_LO;
636:
637: t[0].tv_sec = stp->st_atime;
638: #ifdef ST_ATIME_NSEC
639: t[0].tv_usec = stp->ST_ATIME_NSEC / 1000;
640: #else
641: t[0].tv_usec = 0;
642: #endif
643: t[1].tv_sec = stp->st_mtime;
644: #ifdef ST_MTIME_NSEC
645: t[1].tv_usec = stp->ST_MTIME_NSEC / 1000;
646: #else
647: t[1].tv_usec = 0;
648: #endif
649: return lutimes(fname, t);
650: }
651: #endif
652:
653: #ifdef HAVE_UTIMES
654: int do_utimes(const char *fname, STRUCT_STAT *stp)
655: {
656: struct timeval t[2];
657:
658: if (dry_run) return 0;
659: RETURN_ERROR_IF_RO_OR_LO;
660:
661: t[0].tv_sec = stp->st_atime;
662: #ifdef ST_ATIME_NSEC
663: t[0].tv_usec = stp->ST_ATIME_NSEC / 1000;
664: #else
665: t[0].tv_usec = 0;
666: #endif
667: t[1].tv_sec = stp->st_mtime;
668: #ifdef ST_MTIME_NSEC
669: t[1].tv_usec = stp->ST_MTIME_NSEC / 1000;
670: #else
671: t[1].tv_usec = 0;
672: #endif
673: return utimes(fname, t);
674: }
675:
676: #elif defined HAVE_UTIME
677: int do_utime(const char *fname, STRUCT_STAT *stp)
678: {
679: #ifdef HAVE_STRUCT_UTIMBUF
680: struct utimbuf tbuf;
681: #else
682: time_t t[2];
683: #endif
684:
685: if (dry_run) return 0;
686: RETURN_ERROR_IF_RO_OR_LO;
687:
688: # ifdef HAVE_STRUCT_UTIMBUF
689: tbuf.actime = stp->st_atime;
690: tbuf.modtime = stp->st_mtime;
691: return utime(fname, &tbuf);
692: # else
693: t[0] = stp->st_atime;
694: t[1] = stp->st_mtime;
695: return utime(fname, t);
696: # endif
697: }
698:
699: #else
700: #error Need utimes or utime function.
701: #endif
702:
703: #ifdef SUPPORT_PREALLOCATION
704: #ifdef FALLOC_FL_KEEP_SIZE
705: #define DO_FALLOC_OPTIONS FALLOC_FL_KEEP_SIZE
706: #else
707: #define DO_FALLOC_OPTIONS 0
708: #endif
709:
710: OFF_T do_fallocate(int fd, OFF_T offset, OFF_T length)
711: {
712: int opts = inplace || preallocate_files ? DO_FALLOC_OPTIONS : 0;
713: int ret;
714: RETURN_ERROR_IF(dry_run, 0);
715: RETURN_ERROR_IF_RO_OR_LO;
716: if (length & 1) /* make the length not match the desired length */
717: length++;
718: else
719: length--;
720: #if defined HAVE_FALLOCATE
721: ret = fallocate(fd, opts, offset, length);
722: #elif defined HAVE_SYS_FALLOCATE
723: ret = syscall(SYS_fallocate, fd, opts, (loff_t)offset, (loff_t)length);
724: #elif defined HAVE_EFFICIENT_POSIX_FALLOCATE
725: ret = posix_fallocate(fd, offset, length);
726: #else
727: #error Coding error in SUPPORT_PREALLOCATION logic.
728: #endif
729: if (ret < 0)
730: return ret;
731: if (opts == 0) {
732: STRUCT_STAT st;
733: if (do_fstat(fd, &st) < 0)
734: return length;
735: return st.st_blocks * S_BLKSIZE;
736: }
737: return 0;
738: }
739: #endif
740:
741: /* Punch a hole at pos for len bytes. The current file position must be at pos and will be
742: * changed to be at pos + len. */
743: int do_punch_hole(int fd, OFF_T pos, OFF_T len)
744: {
745: #ifdef HAVE_FALLOCATE
746: # ifdef HAVE_FALLOC_FL_PUNCH_HOLE
747: if (fallocate(fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, pos, len) == 0) {
748: if (do_lseek(fd, len, SEEK_CUR) != pos + len)
749: return -1;
750: return 0;
751: }
752: # endif
753: # ifdef HAVE_FALLOC_FL_ZERO_RANGE
754: if (fallocate(fd, FALLOC_FL_ZERO_RANGE, pos, len) == 0) {
755: if (do_lseek(fd, len, SEEK_CUR) != pos + len)
756: return -1;
757: return 0;
758: }
759: # endif
760: #else
761: (void)pos;
762: #endif
763: {
764: char zeros[4096];
765: memset(zeros, 0, sizeof zeros);
766: while (len > 0) {
767: int chunk = len > (int)sizeof zeros ? (int)sizeof zeros : len;
768: int wrote = write(fd, zeros, chunk);
769: if (wrote <= 0) {
770: if (wrote < 0 && errno == EINTR)
771: continue;
772: return -1;
773: }
774: len -= wrote;
775: }
776: }
777: return 0;
778: }
779:
780: int do_open_nofollow(const char *pathname, int flags)
781: {
782: #ifndef O_NOFOLLOW
783: STRUCT_STAT f_st, l_st;
784: #endif
785: int fd;
786:
787: if (flags != O_RDONLY) {
788: RETURN_ERROR_IF(dry_run, 0);
789: RETURN_ERROR_IF_RO_OR_LO;
790: #ifndef O_NOFOLLOW
791: /* This function doesn't support write attempts w/o O_NOFOLLOW. */
792: errno = EINVAL;
793: return -1;
794: #endif
795: }
796:
797: if (direct_io)
798: flags |= O_DIRECT;
799:
800: #ifdef O_NOFOLLOW
801: fd = open(pathname, flags|O_NOFOLLOW);
802: #else
803: if (do_lstat(pathname, &l_st) < 0)
804: return -1;
805: if (S_ISLNK(l_st.st_mode)) {
806: errno = ELOOP;
807: return -1;
808: }
809: if ((fd = open(pathname, flags)) < 0)
810: return fd;
811: if (do_fstat(fd, &f_st) < 0) {
812: close_and_return_error:
813: {
814: int save_errno = errno;
815: close(fd);
816: errno = save_errno;
817: }
818: return -1;
819: }
820: if (l_st.st_dev != f_st.st_dev || l_st.st_ino != f_st.st_ino) {
821: errno = EINVAL;
822: goto close_and_return_error;
823: }
824: #endif
825:
826: return fd;
827: }
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