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      1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "base/files/file_util.h"
      6 
      7 #include <errno.h>
      8 #include <linux/magic.h>
      9 #include <sys/vfs.h>
     10 
     11 #include "base/files/file_path.h"
     12 
     13 // Make sure some of the newer macros from magic.h are defined.
     14 // TODO(mostynb (at) opera.com): remove this after 2014.
     15 #ifndef BTRFS_SUPER_MAGIC
     16 #define BTRFS_SUPER_MAGIC 0x9123683E
     17 #endif
     18 #ifndef HUGETLBFS_MAGIC
     19 #define HUGETLBFS_MAGIC 0x958458f6
     20 #endif
     21 #ifndef RAMFS_MAGIC
     22 #define RAMFS_MAGIC 0x858458f6
     23 #endif
     24 #ifndef TMPFS_MAGIC
     25 #define TMPFS_MAGIC 0x01021994
     26 #endif
     27 
     28 namespace base {
     29 
     30 bool GetFileSystemType(const FilePath& path, FileSystemType* type) {
     31   struct statfs statfs_buf;
     32   if (statfs(path.value().c_str(), &statfs_buf) < 0) {
     33     if (errno == ENOENT)
     34       return false;
     35     *type = FILE_SYSTEM_UNKNOWN;
     36     return true;
     37   }
     38 
     39   // Not all possible |statfs_buf.f_type| values are in linux/magic.h.
     40   // Missing values are copied from the statfs man page.
     41   switch (statfs_buf.f_type) {
     42     case 0:
     43       *type = FILE_SYSTEM_0;
     44       break;
     45     case EXT2_SUPER_MAGIC:  // Also ext3 and ext4
     46     case MSDOS_SUPER_MAGIC:
     47     case REISERFS_SUPER_MAGIC:
     48     case BTRFS_SUPER_MAGIC:
     49     case 0x5346544E:  // NTFS
     50     case 0x58465342:  // XFS
     51     case 0x3153464A:  // JFS
     52       *type = FILE_SYSTEM_ORDINARY;
     53       break;
     54     case NFS_SUPER_MAGIC:
     55       *type = FILE_SYSTEM_NFS;
     56       break;
     57     case SMB_SUPER_MAGIC:
     58     case 0xFF534D42:  // CIFS
     59       *type = FILE_SYSTEM_SMB;
     60       break;
     61     case CODA_SUPER_MAGIC:
     62       *type = FILE_SYSTEM_CODA;
     63       break;
     64     case HUGETLBFS_MAGIC:
     65     case RAMFS_MAGIC:
     66     case TMPFS_MAGIC:
     67       *type = FILE_SYSTEM_MEMORY;
     68       break;
     69     case CGROUP_SUPER_MAGIC:
     70       *type = FILE_SYSTEM_CGROUP;
     71       break;
     72     default:
     73       *type = FILE_SYSTEM_OTHER;
     74   }
     75   return true;
     76 }
     77 
     78 }  // namespace base
     79