e4defrag: Fix the overflow in e4defrag with > 2GB files

The fallocate() interface on 32-bit machines is defined to use off_t,
not loff_t (even though the system call interface is 64-bit clean).
This causes e4defrag to fail on files greater than 2GB.  Fix this by
trying to use fallocate64(), and using the hard-coded syscall if it
does not exist.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

configure

@@ -10699,7 +10699,7 @@ if test "$ac_res" != no; then :
 fi
 
 fi
-for ac_func in chflags getrusage llseek lseek64 open64 fstat64 ftruncate64 getmntinfo strtoull strcasecmp srandom jrand48 fchown mallinfo fdatasync strnlen strptime strdup sysconf pathconf posix_memalign memalign valloc __secure_getenv prctl mmap utime setresuid setresgid usleep nanosleep getdtablesize getrlimit sync_file_range posix_fadvise fallocate blkid_probe_get_topology mbstowcs
+for ac_func in chflags getrusage llseek lseek64 open64 fstat64 ftruncate64 getmntinfo strtoull strcasecmp srandom jrand48 fchown mallinfo fdatasync strnlen strptime strdup sysconf pathconf posix_memalign memalign valloc __secure_getenv prctl mmap utime setresuid setresgid usleep nanosleep getdtablesize getrlimit sync_file_range posix_fadvise fallocate fallocate64 blkid_probe_get_topology mbstowcs
 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"

configure.in

@@ -853,7 +853,7 @@ if test -n "$BLKID_CMT"; then
   AC_SEARCH_LIBS([blkid_probe_all], [blkid])
 fi
 dnl
-AC_CHECK_FUNCS(chflags getrusage llseek lseek64 open64 fstat64 ftruncate64 getmntinfo strtoull strcasecmp srandom jrand48 fchown mallinfo fdatasync strnlen strptime strdup sysconf pathconf posix_memalign memalign valloc __secure_getenv prctl mmap utime setresuid setresgid usleep nanosleep getdtablesize getrlimit sync_file_range posix_fadvise fallocate blkid_probe_get_topology mbstowcs)
+AC_CHECK_FUNCS(chflags getrusage llseek lseek64 open64 fstat64 ftruncate64 getmntinfo strtoull strcasecmp srandom jrand48 fchown mallinfo fdatasync strnlen strptime strdup sysconf pathconf posix_memalign memalign valloc __secure_getenv prctl mmap utime setresuid setresgid usleep nanosleep getdtablesize getrlimit sync_file_range posix_fadvise fallocate fallocate64 blkid_probe_get_topology mbstowcs)
 dnl
 dnl Check to see if -lsocket is required (solaris) to make something
 dnl that uses socket() to compile; this is needed for the UUID library

misc/e4defrag.c

@@ -327,7 +327,7 @@ int sync_file_range(int fd, loff_t offset, loff_t length, unsigned int flag)
 }
 #endif /* ! HAVE_SYNC_FILE_RANGE */
 
-#ifndef HAVE_FALLOCATE
+#ifndef HAVE_FALLOCATE64
 #warning Using locally defined fallocate syscall interface.
 
 #ifndef __NR_fallocate
@@ -335,14 +335,14 @@ int sync_file_range(int fd, loff_t offset, loff_t length, unsigned int flag)
 #endif
 
 /*
- * fallocate() -	Manipulate file space.
+ * fallocate64() -	Manipulate file space.
  *
  * @fd:			defrag target file's descriptor.
  * @mode:		process flag.
  * @offset:		file offset.
  * @len:		file size.
  */
-static int fallocate(int fd, int mode, loff_t offset, loff_t len)
+static int fallocate64(int fd, int mode, loff_t offset, loff_t len)
 {
 	return syscall(__NR_fallocate, fd, mode, offset, len);
 }
@@ -1738,7 +1738,7 @@ static int file_defrag(const char *file, const struct stat64 *buf,
 	/* Allocate space for donor inode */
 	orig_group_tmp = orig_group_head;
 	do {
-		ret = fallocate(donor_fd, 0,
+		ret = fallocate64(donor_fd, 0,
 		  (loff_t)orig_group_tmp->start->data.logical * block_size,
 		  (loff_t)orig_group_tmp->len * block_size);
 		if (ret < 0) {