general code cleanup

src/fuse_listxattr.cpp

@@ -0,0 +1,146 @@
+/*
+  Copyright (c) 2018, Antonio SJ Musumeci <trapexit@spawn.link>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#include "buildvector.hpp"
+#include "category.hpp"
+#include "config.hpp"
+#include "errno.hpp"
+#include "fs_base_listxattr.hpp"
+#include "fs_path.hpp"
+#include "rwlock.hpp"
+#include "ugid.hpp"
+#include "xattr.hpp"
+
+#include <fuse.h>
+
+#include <string>
+#include <vector>
+
+#include <string.h>
+
+using std::string;
+using std::vector;
+
+namespace l
+{
+  static
+  int
+  listxattr_controlfile(char         *list_,
+                        const size_t  size_)
+  {
+    string xattrs;
+    const vector<string> strs =
+      buildvector<string>
+      ("user.mergerfs.branches")
+      ("user.mergerfs.cache.open")
+      ("user.mergerfs.cache.statfs")
+      ("user.mergerfs.direct_io")
+      ("user.mergerfs.dropcacheonclose")
+      ("user.mergerfs.ignorepponrename")
+      ("user.mergerfs.link_cow")
+      ("user.mergerfs.minfreespace")
+      ("user.mergerfs.moveonenospc")
+      ("user.mergerfs.nullrw")
+      ("user.mergerfs.pid")
+      ("user.mergerfs.policies")
+      ("user.mergerfs.security_capability")
+      ("user.mergerfs.srcmounts")
+      ("user.mergerfs.statfs")
+      ("user.mergerfs.statfs_ignore")
+      ("user.mergerfs.symlinkify")
+      ("user.mergerfs.symlinkify_timeout")
+      ("user.mergerfs.version")
+      ("user.mergerfs.xattr")
+      ;
+
+    xattrs.reserve(1024);
+    for(size_t i = 0; i < strs.size(); i++)
+      xattrs += (strs[i] + '\0');
+    for(size_t i = Category::Enum::BEGIN; i < Category::Enum::END; i++)
+      xattrs += ("user.mergerfs.category." + (std::string)*Category::categories[i] + '\0');
+    for(size_t i = FuseFunc::Enum::BEGIN; i < FuseFunc::Enum::END; i++)
+      xattrs += ("user.mergerfs.func." + (std::string)*FuseFunc::fusefuncs[i] + '\0');
+
+    if(size_ == 0)
+      return xattrs.size();
+
+    if(size_ < xattrs.size())
+      return -ERANGE;
+
+    memcpy(list_,xattrs.c_str(),xattrs.size());
+
+    return xattrs.size();
+  }
+
+  static
+  int
+  listxattr(Policy::Func::Search  searchFunc_,
+            const Branches       &branches_,
+            const uint64_t        minfreespace_,
+            const char           *fusepath_,
+            char                 *list_,
+            const size_t          size_)
+  {
+    int rv;
+    string fullpath;
+    vector<const string*> basepaths;
+
+    rv = searchFunc_(branches_,fusepath_,minfreespace_,basepaths);
+    if(rv == -1)
+      return -errno;
+
+    fullpath = fs::path::make(basepaths[0],fusepath_);
+
+    rv = fs::llistxattr(fullpath,list_,size_);
+
+    return ((rv == -1) ? -errno : rv);
+  }
+}
+
+namespace FUSE
+{
+  int
+  listxattr(const char *fusepath_,
+            char       *list_,
+            size_t      size_)
+  {
+    const fuse_context *fc     = fuse_get_context();
+    const Config       &config = Config::get(fc);
+
+    if(fusepath_ == config.controlfile)
+      return l::listxattr_controlfile(list_,size_);
+
+    switch(config.xattr)
+      {
+      case 0:
+        break;
+      case ENOATTR:
+        return 0;
+      default:
+        return -config.xattr;
+      }
+
+    const ugid::Set         ugid(fc->uid,fc->gid);
+    const rwlock::ReadGuard readlock(&config.branches_lock);
+
+    return l::listxattr(config.listxattr,
+                        config.branches,
+                        config.minfreespace,
+                        fusepath_,
+                        list_,
+                        size_);
+  }
+}