libfksmbsrv/common/reparse.c

b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross/*
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b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross */
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross/*  Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross/*    All Rights Reserved   */
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross/*
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross * Copyright (c) 1989, 2010, Oracle and/or its affiliates. All rights reserved.
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross * Copyright 2013 Nexenta Systems, Inc.  All rights reserved.
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross */
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross#include <sys/types.h>
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross#include <sys/param.h>
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross#include <sys/errno.h>
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross#include <sys/vnode.h>
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross#include <sys/nvpair.h>
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross#include <sys/uio.h>
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross#include <sys/kmem.h>
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross#include <fs/fs_subr.h>
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross#include <fs/fs_reparse.h>
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross/*
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross * support functions for reparse point
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross * copied from uts/common/fs/fs_subr.c
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross */
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross/*
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross * reparse_vnode_parse
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross *
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross * Read the symlink data of a reparse point specified by the vnode
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross * and return the reparse data as name-value pair in the nvlist.
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross */
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Rossint
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Rossreparse_vnode_parse(vnode_t *vp, nvlist_t *nvl)
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross{
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross    int err;
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross    char *lkdata;
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross    struct uio uio;
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross    struct iovec iov;
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross    if (vp == NULL || nvl == NULL)
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross        return (EINVAL);
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross    lkdata = kmem_alloc(MAXREPARSELEN, KM_SLEEP);
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross    /*
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross     * Set up io vector to read sym link data
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross     */
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross    iov.iov_base = lkdata;
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross    iov.iov_len = MAXREPARSELEN;
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross    uio.uio_iov = &iov;
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross    uio.uio_iovcnt = 1;
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross    uio.uio_segflg = UIO_SYSSPACE;
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross    uio.uio_extflg = UIO_COPY_CACHED;
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross    uio.uio_loffset = (offset_t)0;
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross    uio.uio_resid = MAXREPARSELEN;
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross    if ((err = VOP_READLINK(vp, &uio, zone_kcred(), NULL)) == 0) {
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross        *(lkdata + MAXREPARSELEN - uio.uio_resid) = '\0';
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross        err = reparse_parse(lkdata, nvl);
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross    }
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross    kmem_free(lkdata, MAXREPARSELEN);   /* done with lkdata */
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross    return (err);
b819cea2f73f98c5662230cc9affc8cc84f77fcfGordon Ross}