又爆出../../misc/e4defrag.c:202:2: 错误：#error neither fallocate64 nor posix_fallocate64 available!

这个错误， google 后，找到个补丁

From: "Anthony G. Basile" <blueness@xxxxxxxxxx>

Commit 58229aaf removed the broken fallback syscall for fallocate64() on systems
where the latter is unavailable.  However, it did not provide a substitute,
so the build fails on uClibc which does not have fallocate64(), but does have
posix_fallocate64().  Since fallocate64() is called with mode=0, we can make use
of posix_fallocate64() on such systems.

See `man 2 fallocate` and `man 3 posix_fallocate`.
---
configure       |  2 +-
configure.in    |  1 +
lib/config.h.in |  3 +++
misc/e4defrag.c | 10 +++++++---
4 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/configure b/configure
index 6c503aa..9853bc0 100755
--- a/configure
+++ b/configure
@@ -13071,7 +13071,7 @@ if test "$ac_res" != no; then :
fi

fi
-for ac_func in          __secure_getenv         backtrace         blkid_probe_get_topology         blkid_probe_enable_partitions         chflags         fadvise64         fallocate         fallocate64         fchown         fdatasync         fstat64         ftruncate64         futimes         getcwd         getdtablesize         getmntinfo         getpwuid_r         getrlimit         getrusage         jrand48         llistxattr         llseek         lseek64         mallinfo         mbstowcs         memalign         mempcpy         mmap         msync         nanosleep         open64         pathconf         posix_fadvise         posix_fadvise64         posix_memalign         prctl         secure_getenv         setmntent         setresgid         setresuid         snprintf         srandom         stpcpy         strcasecmp         strdup         strnlen         strptime         strtoull         sync_file_range         sysconf         usleep         utime         valloc
+for ac_func in          __secure_getenv         backtrace         blkid_probe_get_topology         blkid_probe_enable_partitions         chflags         fadvise64         fallocate         fallocate64         fchown         fdatasync         fstat64         ftruncate64         futimes         getcwd         getdtablesize         getmntinfo         getpwuid_r         getrlimit         getrusage         jrand48         llistxattr         llseek         lseek64         mallinfo         mbstowcs         memalign         mempcpy         mmap         msync         nanosleep         open64         pathconf         posix_fadvise         posix_fadvise64         posix_fallocate64         posix_memalign         prctl         secure_getenv         setmntent         setresgid         setresuid         snprintf         srandom         stpcpy         strcasecmp         strdup         strnlen         strptime         strtoull         sync_file_range         sysconf         usleep         utime         valloc
do :
   as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"
diff --git a/configure.in b/configure.in
index 67e5453..48fa099 100644
--- a/configure.in
+++ b/configure.in
@@ -1113,6 +1113,7 @@ AC_CHECK_FUNCS(m4_flatten([
        pathconf
        posix_fadvise
        posix_fadvise64
+        posix_fallocate64
        posix_memalign
        prctl
        secure_getenv
diff --git a/lib/config.h.in b/lib/config.h.in
index 12a609a..3d6796d 100644
--- a/lib/config.h.in
+++ b/lib/config.h.in
@@ -331,6 +331,9 @@
/* Define to 1 if you have the `posix_fadvise64' function. */
#undef HAVE_POSIX_FADVISE64

+/* Define to 1 if you have the `posix_fallocate64' function. */
+#undef HAVE_POSIX_FALLOCATE64
+
/* Define to 1 if you have the `posix_memalign' function. */
#undef HAVE_POSIX_MEMALIGN

diff --git a/misc/e4defrag.c b/misc/e4defrag.c
index d0eac60..ba16a76 100644
--- a/misc/e4defrag.c
+++ b/misc/e4defrag.c
@@ -197,9 +197,9 @@ static struct frag_statistic_ino        frag_rank[SHOW_FRAG_FILES];
#error sync_file_range not available!
#endif /* ! HAVE_SYNC_FILE_RANGE */

-#ifndef HAVE_FALLOCATE64
-#error fallocate64 not available!
-#endif /* ! HAVE_FALLOCATE64 */
+#if !defined(HAVE_FALLOCATE64) && !defined(HAVE_POSIX_FALLOCATE64)
+#error neither fallocate64 nor posix_fallocate64 available!
+#endif /* ! HAVE_FALLOCATE64 && ! HAVE_POSIX_FALLOCATE64 */

/*
  * get_mount_point() -        Get device's mount point.
@@ -1554,7 +1554,11 @@ static int file_defrag(const char *file, const struct stat64 *buf,
        /* Allocate space for donor inode */
        orig_group_tmp = orig_group_head;
        do {
+#ifdef HAVE_FALLOCATE64
                ret = fallocate64(donor_fd, 0,
+#else /* HAVE_POSIX_FALLOCATE64 */
+                ret = posix_fallocate64(donor_fd,
+#endif
                  (loff_t)orig_group_tmp->start->data.logical * block_size,
                  (loff_t)orig_group_tmp->len * block_size);
                if (ret < 0) {
--
1.8.5.5

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