autofs: update mount control expire desription with AUTOFS_EXP_FORCED
Describe AUTOFS_EXP_FORCED in addition to AUTOFS_EXP_IMMEDIATE in the description of the AUTOFS_DEV_IOCTL_EXPIRE_CMD ioctl. Link: http://lkml.kernel.org/r/155287084078.12593.15000931045413195778.stgit@pluto.themaw.net Signed-off-by: Ian Kent <raven@themaw.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -354,8 +354,10 @@ this ioctl is called until no further expire candidates are found.
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The call requires an initialized struct autofs_dev_ioctl with the
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ioctlfd field set to the descriptor obtained from the open call. In
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addition an immediate expire, independent of the mount timeout, can be
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requested by setting the how field of struct args_expire to 1. If no
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addition an immediate expire that's independent of the mount timeout,
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and a forced expire that's independent of whether the mount is busy,
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can be requested by setting the how field of struct args_expire to
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AUTOFS_EXP_IMMEDIATE or AUTOFS_EXP_FORCED, respectively . If no
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expire candidates can be found the ioctl returns -1 with errno set to
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EAGAIN.
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@ -410,6 +410,11 @@ The available ioctl commands are:
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**AUTOFS_EXP_IMMEDIATE** causes `last_used` time to be ignored
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and objects are expired if the are not in use.
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**AUTOFS_EXP_FORCED** causes the in use status to be ignored
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and objects are expired ieven if they are in use. This assumes
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that the daemon has requested this because it is capable of
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performing the umount.
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**AUTOFS_EXP_LEAVES** will select a leaf rather than a top-level
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name to expire. This is only safe when *maxproto* is 4.
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