| f_type | Type of file system. |
| f_flags | A copy of mount exported flags. |
| f_bsize | Fragment size. |
| f_iosize | Optimal transfer block size. |
| f_blocks | The total number of data blocks in the file system. |
| f_bfree | The number of free blocks in the file system. |
| f_bavail | The number of free blocks available to non-superuser processes. |
| f_files | The total number of file nodes in the file system. |
| f_ffree | The number of free nodes available to non-superuser processes. |
| f_syncwrites | The number of synchronous writes since the file system was mounted. |
| f_asyncwrites | The number of asynchronous writes since the file system was mounted. |
| f_syncreads | The number of synchronous reads since the file system was mounted. |
| f_asyncreads | The number of asynchronous reads since the file system was mounted. |
| f_namemax | The maximum file name length for this file system. |
| f_owner | The user ID of the user that mounted the file system. |
| f_fsid | Unique file system ID. |
| f_fstypename | The file system type name; a string of at most MFSNAMELEN bytes. |
| f_mntfromname | The device name the file system was mounted from; a string of at most MNAMELEN bytes. |
| f_mntonname | The name of the directory on which the file system is mounted; a string of at most MNAMELEN bytes. |
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