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docs: fs: locks.rst: update comment about mandatory file locking 

The mandatory file locking got removed due to its problems, but
the fs locks documentation still points to it.

Update the text there, informing that it was removed on Kernel
5.14.

Fixes: f7e33bdbd6 ("fs: remove mandatory file locking support")
Reported-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
This commit is contained in:
Mauro Carvalho Chehab 2021-10-19 09:04:16 +01:00 committed by Jeff Layton
parent ec60f38a91
commit f7c9ee0c72
1 changed files with 5 additions and 12 deletions
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17
Documentation/filesystems/locks.rst
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@ -57,16 +57,9 @@ fcntl(), with all the problems that implies.
1.3 Mandatory Locking As A Mount Option
---------------------------------------
Mandatory locking, as described in
'Documentation/filesystems/mandatory-locking.rst' was prior to this release a
general configuration option that was valid for all mounted filesystems. This
had a number of inherent dangers, not the least of which was the ability to
freeze an NFS server by asking it to read a file for which a mandatory lock
existed.
From this release of the kernel, mandatory locking can be turned on and off
on a per-filesystem basis, using the mount options 'mand' and 'nomand'.
The default is to disallow mandatory locking. The intention is that
mandatory locking only be enabled on a local filesystem as the specific need
arises.
Mandatory locking was prior to this release a general configuration option
that was valid for all mounted filesystems. This had a number of inherent
dangers, not the least of which was the ability to freeze an NFS server by
asking it to read a file for which a mandatory lock existed.
Such option was dropped in Kernel v5.14.