vfs_checkexp(9) [opensolaris man page]

VFS_CHECKEXP(9) 					   BSD Kernel Developer's Manual					   VFS_CHECKEXP(9)

NAME

     VFS_CHECKEXP -- check if a file system is exported to a client

SYNOPSIS

     #include <sys/param.h>
     #include <sys/mount.h>

     int
     VFS_CHECKEXP(struct mount *mp, struct sockaddr *nam, int *exflagsp, struct ucred **credanonp);

DESCRIPTION

     The VFS_CHECKEXP() macro is used by the NFS server to check if a mount point is exported to a client.

     The arguments it expects are:

     mp 	The mount point to be checked.

     nam	An mbuf containing the network address of the client.

     exflagsp	Return parameter for the export flags for this client.

     credanonp	Return parameter for the anonymous credentials for this client.

     The VFS_CHECKEXP() macro should be called on a file system's mount structure to determine if it is exported to a client whose address is con-
     tained in nam.

     It is generally called before VFS_FHTOVP(9) to validate that a client has access to the file system.

     The file system should call vfs_export_lookup(9) with the address of an appropriate netexport structure and the address of the client, nam,
     to verify that the client can access this file system.

RETURN VALUES

     The export flags and anonymous credentials specific to the client (returned by vfs_export_lookup(9)) will be returned in *exflagsp and
     *credanonp.

SEE ALSO

     VFS(9), VFS_FHTOVP(9), VOP_VPTOFH(9), vnode(9)

AUTHORS

     This manual page was written by Alfred Perlstein.

BSD
								  January 4, 2010							       BSD

Check Out this Related Man Page

VFS_FHTOVP(9)						   BSD Kernel Developer's Manual					     VFS_FHTOVP(9)

NAME

     VFS_FHTOVP -- turn an NFS filehandle into a vnode

SYNOPSIS

     #include <sys/param.h>
     #include <sys/mount.h>
     #include <sys/vnode.h>

     int
     VFS_FHTOVP(struct mount *mp, struct fid *fhp, struct vnode **vpp);

DESCRIPTION

     The VFS_FHTOVP() macro is used by the NFS server to turn an NFS filehandle into a vnode.

     The arguments it expects are:

     mp   The file system.

     fhp  The filehandle to convert.

     vpp  Return parameter for the new locked vnode.

     The contents of the filehandle are defined by the file system and are not examined by any other part of the system.  It should contain enough
     information to uniquely identify a file within the file system as well as noticing when a file has been removed and the file system resources
     have been reused for a new file.  For instance, UFS file system stores the inode number and inode generation counter in its filehandle.

     A call to VFS_FHTOVP() should generally be preceded by a call to VFS_CHECKEXP(9) to check if the file is accessible to the client.

RETURN VALUES

     The locked vnode for the file will be returned in *vpp.

SEE ALSO

     VFS(9), VFS_CHECKEXP(9), VOP_VPTOFH(9), vnode(9)

AUTHORS

     This manual page was written by Doug Rabson.

BSD
								  January 4, 2010							       BSD

Linux and UNIX Man Pages

vfs_checkexp(9) [opensolaris man page]

Check Out this Related Man Page