The first field, (fs_spec), describes the block special device or remote filesystem to be mounted.
For ordinary mounts it will hold (a link to) a block special device node (as created by mknod(8)) for the device to be mounted, like `/dev/cdrom' or `/dev/sdb7'. For NFS mounts one will have <host>:<dir>, e.g., `knuth.aeb.nl:/'. For procfs, use `proc'.
Instead of giving the device explicitly, one may indicate the (ext2 or xfs) filesystem that is to be mounted by its UUID or volume label (cf. e2label(8) or xfs_admin(8)), writing LABEL=<label> or UUID=<uuid>, e.g., `LABEL=Boot' or `UUID=3e6be9de-8139-11d1-9106-a43f08d823a6'. This will make the system more robust: adding or removing a SCSI disk changes the disk device name but not the filesystem volume label.
The second field, (fs_file), describes the mount point for the filesystem. For swap partitions, this field should be specified as `none'. If the name of the mount point contains spaces these can be escaped as `\040'.
The third field, (fs_vfstype), describes the type of the filesystem. Linux supports lots of filesystem types, such as adfs, affs, autofs, coda, coherent, cramfs, devpts, efs, ext2, ext3, hfs, hpfs, iso9660, jfs, minix, msdos, ncpfs, nfs, ntfs, proc, qnx4, reiserfs, romfs, smbfs, sysv, tmpfs, udf, ufs, umsdos, vfat, xenix, xfs, and possibly others. For more details, see mount(8). For the filesystems currently supported by the running kernel, see /proc/filesystems. An entry swap denotes a file or partition to be used for swapping, cf. swapon(8). An entry ignore causes the line to be ignored. This is useful to show disk partitions which are currently unused.
The fourth field, (fs_mntops), describes the mount options associated with the filesystem.
It is formatted as a comma separated list of options. It contains at least
the type of mount plus any additional options appropriate to the filesystem
type. For documentation on the available options for non-nfs file systems,
see
mount(8).
For documentation on all nfs-specific options have a look at
Common for all types of file system are the options ``noauto''
(do not mount when "mount -a" is given, e.g., at boot time), ``user''
(allow a user to mount), and ``owner''
(allow device owner to mount). For more details, see
mount(8).
The fifth field,
(fs_freq),
is used for these filesystems by the
dump(8)
command to determine which filesystems need to be dumped. If the fifth
field is not present, a value of zero is returned and
dump
will assume that the filesystem does not need to be dumped.
The sixth field,
(fs_passno),
is used by the
fsck(8)
program to determine the order in which filesystem checks are done at
reboot time. The root filesystem should be specified with a
fs_passno
of 1, and other filesystems should have a
fs_passno
of 2. Filesystems within a drive will be checked sequentially, but
filesystems on different drives will be checked at the same time to utilize
parallelism available in the hardware. If the sixth field is not present
or zero, a value of zero is returned and
fsck
will assume that the filesystem does not need to be checked.
The proper way to read records from
fstab
is to use the routines
getmntent(3).