initial code commit

src/fallocate.cpp

@@ -0,0 +1,93 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
+#include <fuse.h>
+
+#include <errno.h>
+#include <fcntl.h>
+
+#include "ugid.hpp"
+#include "config.hpp"
+#include "fileinfo.hpp"
+
+using namespace mergerfs;
+
+static
+int
+_fallocate(const int   fd,
+           const int   mode,
+           const off_t offset,
+           const off_t len)
+{
+  int rv;
+
+#ifdef _GNU_SOURCE
+  rv = ::fallocate(fd,mode,offset,len);
+#elif defined _XOPEN_SOURCE >= 600 || _POSIX_C_SOURCE >= 200112L
+  if(mode)
+    {
+      rv = -1;
+      errno = EOPNOTSUPP;
+    }
+  else
+    {
+      rv = ::posix_fallocate(fd,offset,len);
+    }
+#else
+  rv = -1;
+  errno = EOPNOTSUPP;
+#endif
+
+  return ((rv == -1) ? -errno : 0);
+}
+
+namespace mergerfs
+{
+  namespace fallocate
+  {
+    int
+    fallocate(const char            *fusepath,
+              int                    mode,
+              off_t                  offset,
+              off_t                  len,
+              struct fuse_file_info *fi)
+    {
+      const ugid::SetResetGuard  ugid;
+      const config::Config      &config   = config::get();
+      const FileInfo            *fileinfo = (FileInfo*)fi->fh;
+
+      if(fusepath == config.controlfile)
+        return -EINVAL;
+
+      return _fallocate(fileinfo->fd,
+                        mode,
+                        offset,
+                        len);
+    }
+  }
+}