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Update VFS_CHECKEXP.9 to reflect how it is currently used by the NFS server.

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Reported by:	pluknet
Reviewed by:	bcr
Differential Revision:	https://reviews.freebsd.org/D25333
This commit is contained in:
Rick Macklem 2020-06-27 21:37:48 +00:00
parent 72adb2c07f
commit 1eb2246444
1 changed files with 10 additions and 14 deletions
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24
share/man/man9/VFS_CHECKEXP.9
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@ -24,7 +24,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd June 16, 2020
.Dd June 17, 2020
.Dt VFS_CHECKEXP 9
.Os
.Sh NAME
@ -49,7 +49,7 @@ macro is used by the NFS server to check if a mount point is exported
to a client.
.Pp
The arguments it expects are:
.Bl -tag -width credanonp
.Bl -tag -width numsecflavors
.It Fa mp
The mount point to be checked.
.It Fa nam
@ -71,21 +71,17 @@ macro should be called on a file system's mount structure to determine if it
is exported to a client whose address is contained in
.Fa nam .
.Pp
It is generally called before
.Xr VFS_FHTOVP 9
to validate that a client has access to the file system.
It is called in the NFS server once a vnode for a file handle has been
acquired, in order to determine what access the client is allowed on
the file system the vnode resides in.
For NFSv4, it is also called whenever the lookup operation crosses a
server file system mount point, to update the access information.
.Pp
The file system should call
.Xr vfs_export_lookup 9
with the address of an appropriate
.Vt netexport
structure and the address of the client,
.Fa nam ,
to verify that the client can access this file system.
The operation is file system specific, but is normally handled by
the default ``vfs_stdcheckexp''.
.Sh RETURN VALUES
The export flags, anonymous credentials and security flavors specific to the
client (returned by
.Xr vfs_export_lookup 9 )
client
will be returned in
.Fa *exflagsp ,
.Fa *credanonp ,