1 ///////////////////////////////////////////////////////////////////////////////
4 /// \brief File opening, unlinking, and closing
6 // Author: Lasse Collin
8 // This file has been put into the public domain.
9 // You can do whatever you want with this file.
11 ///////////////////////////////////////////////////////////////////////////////
20 static bool warn_fchown;
23 #if defined(HAVE_FUTIMES) || defined(HAVE_FUTIMESAT) || defined(HAVE_UTIMES)
24 # include <sys/time.h>
25 #elif defined(HAVE_UTIME)
29 #include "tuklib_open_stdxxx.h"
40 /// If true, try to create sparse files when decompressing.
41 static bool try_sparse = true;
43 #ifndef TUKLIB_DOSLIKE
44 /// Original file status flags of standard output. This is used by
45 /// io_open_dest() and io_close_dest() to save and restore the flags.
46 static int stdout_flags;
47 static bool restore_stdout_flags = false;
51 static bool io_write_buf(file_pair *pair, const uint8_t *buf, size_t size);
57 // Make sure that stdin, stdout, and stderr are connected to
58 // a valid file descriptor. Exit immediately with exit code ERROR
59 // if we cannot make the file descriptors valid. Maybe we should
60 // print an error message, but our stderr could be screwed anyway.
61 tuklib_open_stdxxx(E_ERROR);
63 #ifndef TUKLIB_DOSLIKE
64 // If fchown() fails setting the owner, we warn about it only if
66 warn_fchown = geteuid() == 0;
70 // Avoid doing useless things when statting files.
71 // This isn't important but doesn't hurt.
72 _djstat_flags = _STAT_INODE | _STAT_EXEC_EXT
73 | _STAT_EXEC_MAGIC | _STAT_DIRSIZE;
88 /// \brief Unlink a file
90 /// This tries to verify that the file being unlinked really is the file that
91 /// we want to unlink by verifying device and inode numbers. There's still
92 /// a small unavoidable race, but this is much better than nothing (the file
93 /// could have been moved/replaced even hours earlier).
95 io_unlink(const char *name, const struct stat *known_st)
97 #if defined(TUKLIB_DOSLIKE)
98 // On DOS-like systems, st_ino is meaningless, so don't bother
99 // testing it. Just silence a compiler warning.
104 // If --force was used, use stat() instead of lstat(). This way
105 // (de)compressing symlinks works correctly. However, it also means
106 // that xz cannot detect if a regular file foo is renamed to bar
107 // and then a symlink foo -> bar is created. Because of stat()
108 // instead of lstat(), xz will think that foo hasn't been replaced
109 // with another file. Thus, xz will remove foo even though it no
110 // longer is the same file that xz used when it started compressing.
111 // Probably it's not too bad though, so this doesn't need a more
113 const int stat_ret = opt_force
114 ? stat(name, &new_st) : lstat(name, &new_st);
118 // st_ino is an array, and we don't want to
119 // compare st_dev at all.
120 || memcmp(&new_st.st_ino, &known_st->st_ino,
121 sizeof(new_st.st_ino)) != 0
123 // Typical POSIX-like system
124 || new_st.st_dev != known_st->st_dev
125 || new_st.st_ino != known_st->st_ino
128 // TRANSLATORS: When compression or decompression finishes,
129 // and xz is going to remove the source file, xz first checks
130 // if the source file still exists, and if it does, does its
131 // device and inode numbers match what xz saw when it opened
132 // the source file. If these checks fail, this message is
133 // shown, %s being the filename, and the file is not deleted.
134 // The check for device and inode numbers is there, because
135 // it is possible that the user has put a new file in place
136 // of the original file, and in that case it obviously
137 // shouldn't be removed.
138 message_error(_("%s: File seems to have been moved, "
139 "not removing"), name);
142 // There's a race condition between lstat() and unlink()
143 // but at least we have tried to avoid removing wrong file.
145 message_error(_("%s: Cannot remove: %s"),
146 name, strerror(errno));
152 /// \brief Copies owner/group and permissions
154 /// \todo ACL and EA support
157 io_copy_attrs(const file_pair *pair)
159 // Skip chown and chmod on Windows.
160 #ifndef TUKLIB_DOSLIKE
161 // This function is more tricky than you may think at first.
162 // Blindly copying permissions may permit users to access the
163 // destination file who didn't have permission to access the
166 // Try changing the owner of the file. If we aren't root or the owner
167 // isn't already us, fchown() probably doesn't succeed. We warn
168 // about failing fchown() only if we are root.
169 if (fchown(pair->dest_fd, pair->src_st.st_uid, -1) && warn_fchown)
170 message_warning(_("%s: Cannot set the file owner: %s"),
171 pair->dest_name, strerror(errno));
175 if (fchown(pair->dest_fd, -1, pair->src_st.st_gid)) {
176 message_warning(_("%s: Cannot set the file group: %s"),
177 pair->dest_name, strerror(errno));
178 // We can still safely copy some additional permissions:
179 // `group' must be at least as strict as `other' and
182 // NOTE: After this, the owner of the source file may
183 // get additional permissions. This shouldn't be too bad,
184 // because the owner would have had permission to chmod
185 // the original file anyway.
186 mode = ((pair->src_st.st_mode & 0070) >> 3)
187 & (pair->src_st.st_mode & 0007);
188 mode = (pair->src_st.st_mode & 0700) | (mode << 3) | mode;
190 // Drop the setuid, setgid, and sticky bits.
191 mode = pair->src_st.st_mode & 0777;
194 if (fchmod(pair->dest_fd, mode))
195 message_warning(_("%s: Cannot set the file permissions: %s"),
196 pair->dest_name, strerror(errno));
199 // Copy the timestamps. We have several possible ways to do this, of
200 // which some are better in both security and precision.
202 // First, get the nanosecond part of the timestamps. As of writing,
203 // it's not standardized by POSIX, and there are several names for
204 // the same thing in struct stat.
208 # if defined(HAVE_STRUCT_STAT_ST_ATIM_TV_NSEC)
210 atime_nsec = pair->src_st.st_atim.tv_nsec;
211 mtime_nsec = pair->src_st.st_mtim.tv_nsec;
213 # elif defined(HAVE_STRUCT_STAT_ST_ATIMESPEC_TV_NSEC)
215 atime_nsec = pair->src_st.st_atimespec.tv_nsec;
216 mtime_nsec = pair->src_st.st_mtimespec.tv_nsec;
218 # elif defined(HAVE_STRUCT_STAT_ST_ATIMENSEC)
219 // GNU and BSD without extensions
220 atime_nsec = pair->src_st.st_atimensec;
221 mtime_nsec = pair->src_st.st_mtimensec;
223 # elif defined(HAVE_STRUCT_STAT_ST_UATIME)
225 atime_nsec = pair->src_st.st_uatime * 1000;
226 mtime_nsec = pair->src_st.st_umtime * 1000;
228 # elif defined(HAVE_STRUCT_STAT_ST_ATIM_ST__TIM_TV_NSEC)
230 atime_nsec = pair->src_st.st_atim.st__tim.tv_nsec;
231 mtime_nsec = pair->src_st.st_mtim.st__tim.tv_nsec;
239 // Construct a structure to hold the timestamps and call appropriate
240 // function to set the timestamps.
241 #if defined(HAVE_FUTIMENS)
242 // Use nanosecond precision.
243 struct timespec tv[2];
244 tv[0].tv_sec = pair->src_st.st_atime;
245 tv[0].tv_nsec = atime_nsec;
246 tv[1].tv_sec = pair->src_st.st_mtime;
247 tv[1].tv_nsec = mtime_nsec;
249 (void)futimens(pair->dest_fd, tv);
251 #elif defined(HAVE_FUTIMES) || defined(HAVE_FUTIMESAT) || defined(HAVE_UTIMES)
252 // Use microsecond precision.
253 struct timeval tv[2];
254 tv[0].tv_sec = pair->src_st.st_atime;
255 tv[0].tv_usec = atime_nsec / 1000;
256 tv[1].tv_sec = pair->src_st.st_mtime;
257 tv[1].tv_usec = mtime_nsec / 1000;
259 # if defined(HAVE_FUTIMES)
260 (void)futimes(pair->dest_fd, tv);
261 # elif defined(HAVE_FUTIMESAT)
262 (void)futimesat(pair->dest_fd, NULL, tv);
264 // Argh, no function to use a file descriptor to set the timestamp.
265 (void)utimes(pair->dest_name, tv);
268 #elif defined(HAVE_UTIME)
269 // Use one-second precision. utime() doesn't support using file
270 // descriptor either. Some systems have broken utime() prototype
271 // so don't make this const.
272 struct utimbuf buf = {
273 .actime = pair->src_st.st_atime,
274 .modtime = pair->src_st.st_mtime,
281 (void)utime(pair->dest_name, &buf);
288 /// Opens the source file. Returns false on success, true on error.
290 io_open_src_real(file_pair *pair)
292 // There's nothing to open when reading from stdin.
293 if (pair->src_name == stdin_filename) {
294 pair->src_fd = STDIN_FILENO;
295 #ifdef TUKLIB_DOSLIKE
296 setmode(STDIN_FILENO, O_BINARY);
301 // Symlinks are not followed unless writing to stdout or --force
303 const bool follow_symlinks = opt_stdout || opt_force;
305 // We accept only regular files if we are writing the output
306 // to disk too. bzip2 allows overriding this with --force but
307 // gzip and xz don't.
308 const bool reg_files_only = !opt_stdout;
311 int flags = O_RDONLY | O_BINARY | O_NOCTTY;
313 #ifndef TUKLIB_DOSLIKE
314 // If we accept only regular files, we need to be careful to avoid
315 // problems with special files like devices and FIFOs. O_NONBLOCK
316 // prevents blocking when opening such files. When we want to accept
317 // special files, we must not use O_NONBLOCK, or otherwise we won't
318 // block waiting e.g. FIFOs to become readable.
323 #if defined(O_NOFOLLOW)
324 if (!follow_symlinks)
326 #elif !defined(TUKLIB_DOSLIKE)
327 // Some POSIX-like systems lack O_NOFOLLOW (it's not required
328 // by POSIX). Check for symlinks with a separate lstat() on
330 if (!follow_symlinks) {
332 if (lstat(pair->src_name, &st)) {
333 message_error("%s: %s", pair->src_name,
337 } else if (S_ISLNK(st.st_mode)) {
338 message_warning(_("%s: Is a symbolic link, "
339 "skipping"), pair->src_name);
345 (void)follow_symlinks;
348 // Try to open the file. If we are accepting non-regular files,
349 // unblock the caught signals so that open() can be interrupted
350 // if it blocks e.g. due to a FIFO file.
354 // Maybe this wouldn't need a loop, since all the signal handlers for
355 // which we don't use SA_RESTART set user_abort to true. But it
356 // doesn't hurt to have it just in case.
358 pair->src_fd = open(pair->src_name, flags);
359 } while (pair->src_fd == -1 && errno == EINTR && !user_abort);
364 if (pair->src_fd == -1) {
365 // If we were interrupted, don't display any error message.
366 if (errno == EINTR) {
367 // All the signals that don't have SA_RESTART
374 // Give an understandable error message if the reason
375 // for failing was that the file was a symbolic link.
377 // Note that at least Linux, OpenBSD, Solaris, and Darwin
378 // use ELOOP to indicate that O_NOFOLLOW was the reason
379 // that open() failed. Because there may be
380 // directories in the pathname, ELOOP may occur also
381 // because of a symlink loop in the directory part.
382 // So ELOOP doesn't tell us what actually went wrong,
383 // and this stupidity went into POSIX-1.2008 too.
385 // FreeBSD associates EMLINK with O_NOFOLLOW and
386 // Tru64 uses ENOTSUP. We use these directly here
387 // and skip the lstat() call and the associated race.
388 // I want to hear if there are other kernels that
389 // fail with something else than ELOOP with O_NOFOLLOW.
390 bool was_symlink = false;
392 # if defined(__FreeBSD__) || defined(__DragonFly__)
396 # elif defined(__digital__) && defined(__unix__)
397 if (errno == ENOTSUP)
400 # elif defined(__NetBSD__)
405 if (errno == ELOOP && !follow_symlinks) {
406 const int saved_errno = errno;
408 if (lstat(pair->src_name, &st) == 0
409 && S_ISLNK(st.st_mode))
417 message_warning(_("%s: Is a symbolic link, "
418 "skipping"), pair->src_name);
421 // Something else than O_NOFOLLOW failing
422 // (assuming that the race conditions didn't
424 message_error("%s: %s", pair->src_name,
430 #ifndef TUKLIB_DOSLIKE
431 // Drop O_NONBLOCK, which is used only when we are accepting only
432 // regular files. After the open() call, we want things to block
433 // instead of giving EAGAIN.
434 if (reg_files_only) {
435 flags = fcntl(pair->src_fd, F_GETFL);
439 flags &= ~O_NONBLOCK;
441 if (fcntl(pair->src_fd, F_SETFL, flags) == -1)
446 // Stat the source file. We need the result also when we copy
447 // the permissions, and when unlinking.
448 if (fstat(pair->src_fd, &pair->src_st))
451 if (S_ISDIR(pair->src_st.st_mode)) {
452 message_warning(_("%s: Is a directory, skipping"),
457 if (reg_files_only && !S_ISREG(pair->src_st.st_mode)) {
458 message_warning(_("%s: Not a regular file, skipping"),
463 #ifndef TUKLIB_DOSLIKE
464 if (reg_files_only && !opt_force) {
465 if (pair->src_st.st_mode & (S_ISUID | S_ISGID)) {
466 // gzip rejects setuid and setgid files even
467 // when --force was used. bzip2 doesn't check
468 // for them, but calls fchown() after fchmod(),
469 // and many systems automatically drop setuid
470 // and setgid bits there.
472 // We accept setuid and setgid files if
473 // --force was used. We drop these bits
474 // explicitly in io_copy_attr().
475 message_warning(_("%s: File has setuid or "
476 "setgid bit set, skipping"),
481 if (pair->src_st.st_mode & S_ISVTX) {
482 message_warning(_("%s: File has sticky bit "
488 if (pair->src_st.st_nlink > 1) {
489 message_warning(_("%s: Input file has more "
490 "than one hard link, "
491 "skipping"), pair->src_name);
500 message_error("%s: %s", pair->src_name, strerror(errno));
502 (void)close(pair->src_fd);
508 io_open_src(const char *src_name)
510 if (is_empty_filename(src_name))
513 // Since we have only one file open at a time, we can use
514 // a statically allocated structure.
515 static file_pair pair;
518 .src_name = src_name,
523 .dest_try_sparse = false,
524 .dest_pending_sparse = 0,
527 // Block the signals, for which we have a custom signal handler, so
528 // that we don't need to worry about EINTR.
530 const bool error = io_open_src_real(&pair);
533 return error ? NULL : &pair;
537 /// \brief Closes source file of the file_pair structure
539 /// \param pair File whose src_fd should be closed
540 /// \param success If true, the file will be removed from the disk if
541 /// closing succeeds and --keep hasn't been used.
543 io_close_src(file_pair *pair, bool success)
545 if (pair->src_fd != STDIN_FILENO && pair->src_fd != -1) {
546 #ifdef TUKLIB_DOSLIKE
547 (void)close(pair->src_fd);
550 // If we are going to unlink(), do it before closing the file.
551 // This way there's no risk that someone replaces the file and
552 // happens to get same inode number, which would make us
553 // unlink() wrong file.
555 // NOTE: DOS-like systems are an exception to this, because
556 // they don't allow unlinking files that are open. *sigh*
557 if (success && !opt_keep_original)
558 io_unlink(pair->src_name, &pair->src_st);
560 #ifndef TUKLIB_DOSLIKE
561 (void)close(pair->src_fd);
570 io_open_dest_real(file_pair *pair)
572 if (opt_stdout || pair->src_fd == STDIN_FILENO) {
573 // We don't modify or free() this.
574 pair->dest_name = (char *)"(stdout)";
575 pair->dest_fd = STDOUT_FILENO;
576 #ifdef TUKLIB_DOSLIKE
577 setmode(STDOUT_FILENO, O_BINARY);
580 pair->dest_name = suffix_get_dest_name(pair->src_name);
581 if (pair->dest_name == NULL)
584 // If --force was used, unlink the target file first.
585 if (opt_force && unlink(pair->dest_name) && errno != ENOENT) {
586 message_error(_("%s: Cannot remove: %s"),
587 pair->dest_name, strerror(errno));
588 free(pair->dest_name);
593 const int flags = O_WRONLY | O_BINARY | O_NOCTTY
595 const mode_t mode = S_IRUSR | S_IWUSR;
596 pair->dest_fd = open(pair->dest_name, flags, mode);
598 if (pair->dest_fd == -1) {
599 message_error("%s: %s", pair->dest_name,
601 free(pair->dest_name);
606 // If this really fails... well, we have a safe fallback.
607 if (fstat(pair->dest_fd, &pair->dest_st)) {
609 pair->dest_st.st_ino[0] = 0;
610 pair->dest_st.st_ino[1] = 0;
611 pair->dest_st.st_ino[2] = 0;
612 #elif !defined(TUKLIB_DOSLIKE)
613 pair->dest_st.st_dev = 0;
614 pair->dest_st.st_ino = 0;
616 #ifndef TUKLIB_DOSLIKE
617 } else if (try_sparse && opt_mode == MODE_DECOMPRESS) {
618 // When writing to standard output, we need to be extra
620 // - It may be connected to something else than
622 // - We aren't necessarily writing to a new empty file
623 // or to the end of an existing file.
624 // - O_APPEND may be active.
626 // TODO: I'm keeping this disabled for DOS-like systems
627 // for now. FAT doesn't support sparse files, but NTFS
628 // does, so maybe this should be enabled on Windows after
630 if (pair->dest_fd == STDOUT_FILENO) {
631 if (!S_ISREG(pair->dest_st.st_mode))
634 stdout_flags = fcntl(STDOUT_FILENO, F_GETFL);
635 if (stdout_flags == -1)
638 if (stdout_flags & O_APPEND) {
639 // Creating a sparse file is not possible
640 // when O_APPEND is active (it's used by
641 // shell's >> redirection). As I understand
642 // it, it is safe to temporarily disable
643 // O_APPEND in xz, because if someone
644 // happened to write to the same file at the
645 // same time, results would be bad anyway
646 // (users shouldn't assume that xz uses any
647 // specific block size when writing data).
649 // The write position may be something else
650 // than the end of the file, so we must fix
651 // it to start writing at the end of the file
652 // to imitate O_APPEND.
653 if (lseek(STDOUT_FILENO, 0, SEEK_END) == -1)
656 if (fcntl(STDOUT_FILENO, F_SETFL,
657 stdout_flags & ~O_APPEND)
661 // Disabling O_APPEND succeeded. Mark
662 // that the flags should be restored
663 // in io_close_dest().
664 restore_stdout_flags = true;
666 } else if (lseek(STDOUT_FILENO, 0, SEEK_CUR)
667 != pair->dest_st.st_size) {
668 // Writing won't start exactly at the end
669 // of the file. We cannot use sparse output,
670 // because it would probably corrupt the file.
675 pair->dest_try_sparse = true;
684 io_open_dest(file_pair *pair)
687 const bool ret = io_open_dest_real(pair);
693 /// \brief Closes destination file of the file_pair structure
695 /// \param pair File whose dest_fd should be closed
696 /// \param success If false, the file will be removed from the disk.
698 /// \return Zero if closing succeeds. On error, -1 is returned and
699 /// error message printed.
701 io_close_dest(file_pair *pair, bool success)
703 #ifndef TUKLIB_DOSLIKE
704 // If io_open_dest() has disabled O_APPEND, restore it here.
705 if (restore_stdout_flags) {
706 assert(pair->dest_fd == STDOUT_FILENO);
708 restore_stdout_flags = false;
710 if (fcntl(STDOUT_FILENO, F_SETFL, stdout_flags) == -1) {
711 message_error(_("Error restoring the O_APPEND flag "
712 "to standard output: %s"),
719 if (pair->dest_fd == -1 || pair->dest_fd == STDOUT_FILENO)
722 if (close(pair->dest_fd)) {
723 message_error(_("%s: Closing the file failed: %s"),
724 pair->dest_name, strerror(errno));
726 // Closing destination file failed, so we cannot trust its
727 // contents. Get rid of junk:
728 io_unlink(pair->dest_name, &pair->dest_st);
729 free(pair->dest_name);
733 // If the operation using this file wasn't successful, we git rid
736 io_unlink(pair->dest_name, &pair->dest_st);
738 free(pair->dest_name);
745 io_close(file_pair *pair, bool success)
747 // Take care of sparseness at the end of the output file.
748 if (success && pair->dest_try_sparse
749 && pair->dest_pending_sparse > 0) {
750 // Seek forward one byte less than the size of the pending
751 // hole, then write one zero-byte. This way the file grows
752 // to its correct size. An alternative would be to use
753 // ftruncate() but that isn't portable enough (e.g. it
754 // doesn't work with FAT on Linux; FAT isn't that important
755 // since it doesn't support sparse files anyway, but we don't
756 // want to create corrupt files on it).
757 if (lseek(pair->dest_fd, pair->dest_pending_sparse - 1,
759 message_error(_("%s: Seeking failed when trying "
760 "to create a sparse file: %s"),
761 pair->dest_name, strerror(errno));
764 const uint8_t zero[1] = { '\0' };
765 if (io_write_buf(pair, zero, 1))
772 // Copy the file attributes. We need to skip this if destination
773 // file isn't open or it is standard output.
774 if (success && pair->dest_fd != -1 && pair->dest_fd != STDOUT_FILENO)
777 // Close the destination first. If it fails, we must not remove
779 if (io_close_dest(pair, success))
782 // Close the source file, and unlink it if the operation using this
783 // file pair was successful and we haven't requested to keep the
785 io_close_src(pair, success);
794 io_read(file_pair *pair, io_buf *buf_union, size_t size)
796 // We use small buffers here.
797 assert(size < SSIZE_MAX);
799 uint8_t *buf = buf_union->u8;
803 const ssize_t amount = read(pair->src_fd, buf, left);
806 pair->src_eof = true;
811 if (errno == EINTR) {
818 message_error(_("%s: Read error: %s"),
819 pair->src_name, strerror(errno));
821 // FIXME Is this needed?
822 pair->src_eof = true;
827 buf += (size_t)(amount);
828 left -= (size_t)(amount);
836 io_pread(file_pair *pair, io_buf *buf, size_t size, off_t pos)
838 // Using lseek() and read() is more portable than pread() and
839 // for us it is as good as real pread().
840 if (lseek(pair->src_fd, pos, SEEK_SET) != pos) {
841 message_error(_("%s: Error seeking the file: %s"),
842 pair->src_name, strerror(errno));
846 const size_t amount = io_read(pair, buf, size);
847 if (amount == SIZE_MAX)
850 if (amount != size) {
851 message_error(_("%s: Unexpected end of file"),
861 is_sparse(const io_buf *buf)
863 assert(IO_BUFFER_SIZE % sizeof(uint64_t) == 0);
865 for (size_t i = 0; i < ARRAY_SIZE(buf->u64); ++i)
866 if (buf->u64[i] != 0)
874 io_write_buf(file_pair *pair, const uint8_t *buf, size_t size)
876 assert(size < SSIZE_MAX);
879 const ssize_t amount = write(pair->dest_fd, buf, size);
881 if (errno == EINTR) {
888 // Handle broken pipe specially. gzip and bzip2
889 // don't print anything on SIGPIPE. In addition,
890 // gzip --quiet uses exit status 2 (warning) on
891 // broken pipe instead of whatever raise(SIGPIPE)
892 // would make it return. It is there to hide "Broken
893 // pipe" message on some old shells (probably old
896 // We don't do anything special with --quiet, which
897 // is what bzip2 does too. If we get SIGPIPE, we
898 // will handle it like other signals by setting
899 // user_abort, and get EPIPE here.
901 message_error(_("%s: Write error: %s"),
902 pair->dest_name, strerror(errno));
907 buf += (size_t)(amount);
908 size -= (size_t)(amount);
916 io_write(file_pair *pair, const io_buf *buf, size_t size)
918 assert(size <= IO_BUFFER_SIZE);
920 if (pair->dest_try_sparse) {
921 // Check if the block is sparse (contains only zeros). If it
922 // sparse, we just store the amount and return. We will take
923 // care of actually skipping over the hole when we hit the
924 // next data block or close the file.
926 // Since io_close() requires that dest_pending_sparse > 0
927 // if the file ends with sparse block, we must also return
928 // if size == 0 to avoid doing the lseek().
929 if (size == IO_BUFFER_SIZE) {
930 if (is_sparse(buf)) {
931 pair->dest_pending_sparse += size;
934 } else if (size == 0) {
938 // This is not a sparse block. If we have a pending hole,
940 if (pair->dest_pending_sparse > 0) {
941 if (lseek(pair->dest_fd, pair->dest_pending_sparse,
943 message_error(_("%s: Seeking failed when "
944 "trying to create a sparse "
945 "file: %s"), pair->dest_name,
950 pair->dest_pending_sparse = 0;
954 return io_write_buf(pair, buf->u8, size);