FileJournal: fix posix_fallocate error handling

From the man page for posix_fallocate:

    posix_fallocate() returns zero on success, or an error
    number on failure.  Note that errno is not set.

Signed-off-by: Noah Watkins <noahwatkins@gmail.com>
Reviewed-by: Sage Weil <sage@inktank.com>

1 files changed, 3 insertions, 4 deletions

diff --git a/src/os/FileJournal.cc b/src/os/FileJournal.cc
index 3acadf09582..4a2af08dd4c 100644
--- a/src/os/FileJournal.cc
+++ b/src/os/FileJournal.cc
@@ -299,11 +299,10 @@ int FileJournal::_open_file(int64_t oldsize, blksize_t blksize,
       return -err;
     }
     ret = ::posix_fallocate(fd, 0, newsize);
-    if (ret < 0) {
-      int err = errno;
+    if (ret) {
       derr << "FileJournal::_open_file : unable to preallocation journal to "
-	   << newsize << " bytes: " << cpp_strerror(err) << dendl;
-      return -err;
+	   << newsize << " bytes: " << cpp_strerror(ret) << dendl;
+      return -ret;
     }
     max_size = newsize;
   }