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Update vfs_busy(9) and vfs_unbusy(9) manual pages to better match the

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current behaviour of the functions.

Discussed with:	attilio
This commit is contained in:
jh 2010-06-14 17:31:46 +00:00
parent 04abdf4b58
commit 25a94f26a9
2 changed files with 11 additions and 18 deletions
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13
share/man/man9/vfs_busy.9
View File

@ -26,7 +26,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd November 2, 2008
.Dd June 14, 2010
.Dt VFS_BUSY 9
.Os
.Sh NAME
@ -40,9 +40,8 @@
.Sh DESCRIPTION
The
.Fn vfs_busy
function marks a mount point as busy.
The purpose of this
function is to synchronize access to a mount point.
function marks a mount point as busy by incrementing
the reference count of a mount point.
It also delays unmounting by sleeping on
.Fa mp
if the
@ -50,7 +49,7 @@ if the
flag is set in
.Fa mp->mnt_kern_flag
and the
.Dv LK_NOWAIT
.Dv MBF_NOWAIT
flag is
.Em not
set.
@ -75,9 +74,9 @@ drop the mountlist_mtx in the critical path.
.Sh RETURN VALUES
A 0 value is returned on success.
If the mount point is being
unmounted
unmounted and MBF_NOWAIT flag is specified
.Er ENOENT
will always be returned.
will be returned.
.Sh ERRORS
.Bl -tag -width Er
.It Bq Er ENOENT

16
share/man/man9/vfs_unbusy.9
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@ -26,7 +26,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd August 29, 2008
.Dd June 14, 2010
.Dt VFS_UNBUSY 9
.Os
.Sh NAME
@ -40,23 +40,17 @@
.Sh DESCRIPTION
The
.Fn vfs_unbusy
function un-busies a mount point by unlocking
.Fa mp->mnt_lock .
The lock is typically acquired by calling
function un-busies a mount point by decrementing
the reference count of a mount point.
The reference count is typically incremented by calling
.Xr vfs_busy 9
prior to this call.
.Pp
Its arguments are:
.Bl -tag -width ".Fa mp"
.It Fa mp
The mount point to unbusy (unlock).
The mount point to unbusy.
.El
.Sh LOCKS
.Va mnt_lock
must be locked in
.Fa mp
prior to calling
this function, and it will be unlocked upon return.
.Sh SEE ALSO
.Xr vfs_busy 9
.Sh AUTHORS