Mercurial > dovecot > original-hg > dovecot-1.2

annotate src/lib/file-set-size.c @ 9191:b340ecb24469 HEAD

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Fix VPATH build of RQUOTA support. Some rpcgen derive #include "..." paths from the infile argument. This will be off for VPATH builds, as the generated rquota_xdr.c code will look in $(srcdir), but we'll generate the rquota.h file in $(builddir). Play safe and copy rquota.x to $(builddir) first. This fixes the build on openSUSE 11.1.
author Matthias Andree <matthias.andree@gmx.de>
date Tue, 07 Jul 2009 21:01:36 +0200
parents b9faf4db2a9f
children de52dfd93516
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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b9faf4db2a9f Updated copyright notices to include year 2009.
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1 /* Copyright (c) 2002-2009 Dovecot authors, see the included COPYING file */
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2
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3 #ifdef HAVE_CONFIG_H
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4 # include "config.h"
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5 #endif
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6
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7 #ifdef HAVE_POSIX_FALLOCATE
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8 # define _XOPEN_SOURCE 600 /* Required by glibc, breaks Solaris 9 */
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9 #endif
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10 #include "lib.h"
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11 #include "file-set-size.h"
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12
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13 #include <unistd.h>
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14 #include <fcntl.h>
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15 #include <sys/stat.h>
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16
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17 int file_set_size(int fd, off_t size)
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18 {
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19 #ifdef HAVE_POSIX_FALLOCATE
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20 static bool posix_fallocate_supported = TRUE;
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21 #endif
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22 char block[4096];
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23 off_t offset;
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24 ssize_t ret;
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25 struct stat st;
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27 i_assert(size >= 0);
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28
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29 if (fstat(fd, &st) < 0) {
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30 i_error("fstat() failed: %m");
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31 return -1;
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32 }
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33
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34 if (size < st.st_size) {
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35 if (ftruncate(fd, size) < 0) {
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36 i_error("ftruncate() failed: %m");
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37 return -1;
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38 }
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39 return 0;
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40 }
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41 if (size == st.st_size)
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42 return 0;
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43
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44 #ifdef HAVE_POSIX_FALLOCATE
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45 if (posix_fallocate_supported) {
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46 if (posix_fallocate(fd, st.st_size, size - st.st_size) == 0)
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47 return 0;
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48
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49 if (errno != EINVAL /* Solaris */) {
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50 if (!ENOSPACE(errno))
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51 i_error("posix_fallocate() failed: %m");
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52 return -1;
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53 }
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54 /* Not supported by kernel, fallback to writing. */
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55 posix_fallocate_supported = FALSE;
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56 }
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57 #endif
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58 /* start growing the file */
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59 offset = st.st_size;
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60 memset(block, 0, I_MIN((ssize_t)sizeof(block), size - offset));
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61
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62 while (offset < size) {
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63 ret = pwrite(fd, block,
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64 I_MIN((ssize_t)sizeof(block), size - offset),
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65 offset);
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66 if (ret < 0) {
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67 if (!ENOSPACE(errno))
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68 i_error("pwrite() failed: %m");
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69 return -1;
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70 }
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71 offset += size;
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72 }
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73 return 0;
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74 }