再帮我看看吧，不太懂，fstab文件内容如下：
lk@lk-desktop:~$ cat /etc/fstab
# /etc/fstab: static file system information.
#
# -- This file has been automaticly generated by ntfs-config --
#
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc defaults 0 0
# Entry for /dev/sda7 :
UUID=037eb20b-4fa4-44b6-af1c-c5454a14a022 / ext4 relatime,errors=remount-ro 0 1
# Entry for /dev/sda8 :
UUID=72409139-c59f-48b4-ac44-829f195bff92 /home ext4 relatime 0 2
# Entry for /dev/sda6 :
UUID=717082a7-6ec3-42e7-b20b-c2c9ed9ab7f7 none swap sw 0 0
/dev/scd0 /media/cdrom0 udf,iso9660 user,noauto,exec,utf8 0 0
/dev/sda1 /media/WinC ntfs-3g defaults,locale=zh_CN.UTF-8 0 0
/dev/sda5 /media/WinD ntfs-3g defaults,locale=zh_CN.UTF-8 0 0
tmpfs /tmp tmpfs,mode=1777 0 0
tmpfs里面没有设置大小，默认应该是用内存的一半吧？
用mount命令后显示：
lk@lk-desktop:~$ mount
/dev/sda7 on / type ext4 (rw,relatime,errors=remount-ro)
tmpfs on /lib/init/rw type tmpfs (rw,nosuid,mode=0755)
proc on /proc type proc (rw,noexec,nosuid,nodev)
sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
varrun on /var/run type tmpfs (rw,nosuid,mode=0755)
varlock on /var/lock type tmpfs (rw,noexec,nosuid,nodev,mode=1777)
udev on /dev type tmpfs (rw,mode=0755)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=620)
fusectl on /sys/fs/fuse/connections type fusectl (rw,relatime)
/dev/sda8 on /home type ext4 (rw,relatime)
/dev/sda1 on /media/WinC type fuseblk (rw,nosuid,nodev,allow_other,blksize=4096)
/dev/sda5 on /media/WinD type fuseblk (rw,nosuid,nodev,allow_other,blksize=4096)
securityfs on /sys/kernel/security type securityfs (rw)
binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,noexec,nosuid,nodev)
gvfs-fuse-daemon on /home/lk/.gvfs type fuse.gvfs-fuse-daemon (rw,nosuid,nodev,user=lk)
我在fstab中加入的语句是为了缓存/tmp目录，mount显示挂载的内容好像没有跟/tmp有关的？