Mercurial > dovecot > original-hg > dovecot-1.2

annotate src/lib/file-set-size.c @ 6569:b7d8695d864d HEAD

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If file_set_size() fails for any other reason than "not enough disk space/quota", log the syscall that caused the error.
author Timo Sirainen <tss@iki.fi>
date Sat, 20 Oct 2007 20:51:30 +0300
parents 65c69a53a7be
children a9dfe05dfadd
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65c69a53a7be Replaced my Copyright notices. The year range always ends with 2007 now.
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1 /* Copyright (c) 2002-2007 Dovecot authors, see the included COPYING file */
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3 #define _XOPEN_SOURCE 600 /* Required by glibc */
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4 #include "lib.h"
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5 #include "file-set-size.h"
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6
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7 #include <unistd.h>
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8 #include <fcntl.h>
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9 #include <sys/stat.h>
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10
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11 int file_set_size(int fd, off_t size)
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12 {
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13 #ifndef HAVE_POSIX_FALLOCATE
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14 char block[4096];
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15 off_t offset;
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16 ssize_t ret;
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17 #endif
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18 struct stat st;
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19
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20 i_assert(size >= 0);
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21
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22 if (fstat(fd, &st) < 0) {
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23 i_error("fstat() failed: %m");
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24 return -1;
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25 }
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27 if (size < st.st_size) {
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28 if (ftruncate(fd, size) < 0) {
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29 i_error("ftruncate() failed: %m");
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30 return -1;
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31 }
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32 return 0;
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33 }
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34 if (size == st.st_size)
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35 return 0;
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36
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37 #ifdef HAVE_POSIX_FALLOCATE
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38 if (posix_fallocate(fd, st.st_size, size - st.st_size) < 0) {
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39 if (!ENOSPACE(errno))
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40 i_error("posix_fallocate() failed: %m");
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41 return -1;
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42 }
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43 #else
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44 /* start growing the file */
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45 offset = st.st_size;
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46 memset(block, 0, I_MIN((ssize_t)sizeof(block), size - offset));
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47
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48 while (offset < size) {
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49 ret = pwrite(fd, block,
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50 I_MIN((ssize_t)sizeof(block), size - offset),
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51 offset);
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52 if (ret < 0) {
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53 if (!ENOSPACE(errno))
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54 i_error("pwrite() failed: %m");
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55 return -1;
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56 }
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57 offset += size;
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58 }
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59 #endif
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60 return 0;
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61 }