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g_file_set_contents(): use posix_fallocate()

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Extents-based filesystems like knowing in advance how much data will be
written to a file in order to prevent fragmentation.  If we have it, use
posix_fallocate() before writing data in g_file_set_contents().

https://bugzilla.gnome.org/show_bug.cgi?id=701560
This commit is contained in:
Ryan Lortie 2013-06-03 15:43:01 -04:00
parent b935059738
commit d3be43fcc5
2 changed files with 8 additions and 1 deletions
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2
configure.ac
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@ -1056,7 +1056,7 @@ AC_MSG_RESULT($glib_ssize_type)
# Check for some functions
AC_CHECK_FUNCS(lstat strerror strsignal memmove vsnprintf stpcpy strcasecmp strncasecmp poll getcwd vasprintf setenv unsetenv getc_unlocked readlink symlink fdwalk memmem)
AC_CHECK_FUNCS(chown lchmod lchown fchmod fchown link utimes getgrgid getpwuid getresuid)
AC_CHECK_FUNCS(getmntent_r setmntent endmntent hasmntopt getfsstat getvfsstat)
AC_CHECK_FUNCS(getmntent_r setmntent endmntent hasmntopt getfsstat getvfsstat posix_fallocate)
# Check for high-resolution sleep functions
AC_CHECK_FUNCS(splice)
AC_CHECK_FUNCS(prlimit)

7
glib/gfileutils.c
View File

@ -1060,6 +1060,13 @@ write_to_temp_file (const gchar *contents,
{
gsize n_written;
#ifdef HAVE_POSIX_FALLOCATE
/* We do this on a 'best effort' basis... It may not be supported
* on the underlying filesystem.
*/
(void) posix_fallocate (fd, 0, length);
#endif
errno = 0;
n_written = fwrite (contents, 1, length, file);