CODEWITHSUNDEEP
linuxmount
vuolen
vuolen

Reputation: 464

Why doesn't 'mount' use all default options listed in man page?

I'm trying to mount the partition /dev/sda4 like this:

sudo mount /dev/sda4

My /etc/fstab has this line:

/dev/sda4 /home/lv/Media ext4 defaults 0 2

But still when I use mount I get this:

/dev/sda4 on /home/lv/Media type ext4 (rw)

I read defaults should be equal to rw, suid, dev, exec, auto, nouser, async, and relatime. What's the deal with this?

Upvotes: 1

Views: 313

Answers (1)

gavv
gavv

Reputation: 4883

From fstab(5):

defaults

use default options: rw, suid, dev, exec, auto, nouser, and async.

I believe, all these options are default behaviour and thus not shown explicitly (one exception is rw). If nosuid is not given, mount defaults to suid; if nodev is not given, mount defaults to dev, and so on.

For example, noexec option is shown:

$ mount /dev/sda1 foo -o noexec
$ ./foo/bin/date 
zsh: permission denied: ./foo/bin/date
$ mount | grep foo
/dev/sda1 on /root/foo type ext4 (rw,noexec)

But exec option is not:

$ mount /dev/sda1 foo -o exec  
$ ./foo/bin/date             
Tue Jul 28 08:58:36 MSK 2015
$ mount | grep foo           
/dev/sda1 on /root/foo type ext4 (rw)

Upvotes: 1

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