Author: rmacklem
Date: Tue Apr 28 02:11:02 2020
New Revision: 360424
URL: https://svnweb.freebsd.org/changeset/base/360424

Log:
  Get rid of uio_XXX macros used for the Mac OS/X port.
  
  The NFS code had a bunch of Mac OS/X accessor functions named uio_XXX
  left over from the port to Mac OS/X. Since that port is long forgotten,
  replace the calls with the code generated by the FreeBSD macros for these
  in nfskpiport.h. This allows the macros to be deleted from nfskpiport.h
  and I think makes the code more readable.
  
  This patch should not result in any semantic change.

Modified:
  head/sys/fs/nfs/nfskpiport.h
  head/sys/fs/nfsclient/nfs_clrpcops.c

Modified: head/sys/fs/nfs/nfskpiport.h
==============================================================================
--- head/sys/fs/nfs/nfskpiport.h        Tue Apr 28 02:08:55 2020        
(r360423)
+++ head/sys/fs/nfs/nfskpiport.h        Tue Apr 28 02:11:02 2020        
(r360424)
@@ -43,20 +43,4 @@ typedef struct vnode *               vnode_t;
 #define        vnode_mount(v)          ((v)->v_mount)
 #define        vnode_vtype(v)          ((v)->v_type)
 
-/*
- * This stuff is needed by Darwin for handling the uio structure.
- */
-#define        uio_uio_resid(p)        ((p)->uio_resid)
-#define        uio_uio_resid_add(p, v) ((p)->uio_resid += (v))
-#define        uio_uio_resid_set(p, v) ((p)->uio_resid = (v))
-#define        uio_iov_base(p)         ((p)->uio_iov->iov_base)
-#define        uio_iov_base_add(p, v)  do {                                    
\
-       char *pp;                                                       \
-       pp = (char *)(p)->uio_iov->iov_base;                            \
-       pp += (v);                                                      \
-       (p)->uio_iov->iov_base = (void *)pp;                            \
-    } while (0)
-#define        uio_iov_len(p)          ((p)->uio_iov->iov_len)
-#define        uio_iov_len_add(p, v)   ((p)->uio_iov->iov_len += (v))
-
 #endif /* _NFS_NFSKPIPORT_H */

Modified: head/sys/fs/nfsclient/nfs_clrpcops.c
==============================================================================
--- head/sys/fs/nfsclient/nfs_clrpcops.c        Tue Apr 28 02:08:55 2020        
(r360423)
+++ head/sys/fs/nfsclient/nfs_clrpcops.c        Tue Apr 28 02:11:02 2020        
(r360424)
@@ -1617,7 +1617,7 @@ nfsrpc_readrpc(vnode_t vp, struct uio *uiop, struct uc
        off_t tmp_off;
 
        *attrflagp = 0;
-       tsiz = uio_uio_resid(uiop);
+       tsiz = uiop->uio_resid;
        tmp_off = uiop->uio_offset + tsiz;
        NFSLOCKMNT(nmp);
        if (tmp_off > nmp->nm_maxfilesize || tmp_off < uiop->uio_offset) {
@@ -1793,7 +1793,7 @@ nfsrpc_writerpc(vnode_t vp, struct uio *uiop, int *iom
 
        KASSERT(uiop->uio_iovcnt == 1, ("nfs: writerpc iovcnt > 1"));
        *attrflagp = 0;
-       tsiz = uio_uio_resid(uiop);
+       tsiz = uiop->uio_resid;
        tmp_off = uiop->uio_offset + tsiz;
        NFSLOCKMNT(nmp);
        if (tmp_off > nmp->nm_maxfilesize || tmp_off < uiop->uio_offset) {
@@ -1878,9 +1878,10 @@ nfsrpc_writerpc(vnode_t vp, struct uio *uiop, int *iom
                         * back.
                         */
                        uiop->uio_offset -= len;
-                       uio_uio_resid_add(uiop, len);
-                       uio_iov_base_add(uiop, -len);
-                       uio_iov_len_add(uiop, len);
+                       uiop->uio_resid += len;
+                       uiop->uio_iov->iov_base =
+                           (char *)uiop->uio_iov->iov_base - len;
+                       uiop->uio_iov->iov_len += len;
                }
                if (nd->nd_flag & (ND_NFSV3 | ND_NFSV4)) {
                        error = nfscl_wcc_data(nd, vp, nap, attrflagp,
@@ -1898,10 +1899,12 @@ nfsrpc_writerpc(vnode_t vp, struct uio *uiop, int *iom
                                        goto nfsmout;
                                } else if (rlen < len) {
                                        backup = len - rlen;
-                                       uio_iov_base_add(uiop, -(backup));
-                                       uio_iov_len_add(uiop, backup);
+                                       uiop->uio_iov->iov_base =
+                                           (char *)uiop->uio_iov->iov_base -
+                                           backup;
+                                       uiop->uio_iov->iov_len += backup;
                                        uiop->uio_offset -= backup;
-                                       uio_uio_resid_add(uiop, backup);
+                                       uiop->uio_resid += backup;
                                        len = rlen;
                                }
                                commit = fxdr_unsigned(int, *tl++);
@@ -2925,7 +2928,7 @@ nfsrpc_readdir(vnode_t vp, struct uio *uiop, nfsuint64
        size_t tresid;
 
        KASSERT(uiop->uio_iovcnt == 1 &&
-           (uio_uio_resid(uiop) & (DIRBLKSIZ - 1)) == 0,
+           (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
            ("nfs readdirrpc bad uio"));
        ncookie.lval[0] = ncookie.lval[1] = 0;
        /*
@@ -2935,13 +2938,13 @@ nfsrpc_readdir(vnode_t vp, struct uio *uiop, nfsuint64
         * will never make readsize > nm_readdirsize.
         */
        readsize = nmp->nm_readdirsize;
-       if (readsize > uio_uio_resid(uiop))
-               readsize = uio_uio_resid(uiop) + DIRBLKSIZ;
+       if (readsize > uiop->uio_resid)
+               readsize = uiop->uio_resid + DIRBLKSIZ;
 
        *attrflagp = 0;
        if (eofp)
                *eofp = 0;
-       tresid = uio_uio_resid(uiop);
+       tresid = uiop->uio_resid;
        cookie.lval[0] = cookiep->nfsuquad[0];
        cookie.lval[1] = cookiep->nfsuquad[1];
        nd->nd_mrep = NULL;
@@ -3036,7 +3039,7 @@ nfsrpc_readdir(vnode_t vp, struct uio *uiop, nfsuint64
                        if (error)
                            return (error);
                        nd->nd_mrep = NULL;
-                       dp = (struct dirent *)uio_iov_base(uiop);
+                       dp = (struct dirent *)uiop->uio_iov->iov_base;
                        dp->d_pad0 = dp->d_pad1 = 0;
                        dp->d_off = 0;
                        dp->d_type = DT_DIR;
@@ -3052,11 +3055,12 @@ nfsrpc_readdir(vnode_t vp, struct uio *uiop, nfsuint64
                        *tl++ = 0;
                        *tl = 0;
                        blksiz += dp->d_reclen;
-                       uio_uio_resid_add(uiop, -(dp->d_reclen));
+                       uiop->uio_resid -= dp->d_reclen;
                        uiop->uio_offset += dp->d_reclen;
-                       uio_iov_base_add(uiop, dp->d_reclen);
-                       uio_iov_len_add(uiop, -(dp->d_reclen));
-                       dp = (struct dirent *)uio_iov_base(uiop);
+                       uiop->uio_iov->iov_base =
+                           (char *)uiop->uio_iov->iov_base + dp->d_reclen;
+                       uiop->uio_iov->iov_len -= dp->d_reclen;
+                       dp = (struct dirent *)uiop->uio_iov->iov_base;
                        dp->d_pad0 = dp->d_pad1 = 0;
                        dp->d_off = 0;
                        dp->d_type = DT_DIR;
@@ -3073,10 +3077,11 @@ nfsrpc_readdir(vnode_t vp, struct uio *uiop, nfsuint64
                        *tl++ = 0;
                        *tl = 0;
                        blksiz += dp->d_reclen;
-                       uio_uio_resid_add(uiop, -(dp->d_reclen));
+                       uiop->uio_resid -= dp->d_reclen;
                        uiop->uio_offset += dp->d_reclen;
-                       uio_iov_base_add(uiop, dp->d_reclen);
-                       uio_iov_len_add(uiop, -(dp->d_reclen));
+                       uiop->uio_iov->iov_base =
+                           (char *)uiop->uio_iov->iov_base + dp->d_reclen;
+                       uiop->uio_iov->iov_len -= dp->d_reclen;
                }
                NFSSETBIT_ATTRBIT(&attrbits, NFSATTRBIT_RDATTRERROR);
        } else {
@@ -3171,19 +3176,20 @@ nfsrpc_readdir(vnode_t vp, struct uio *uiop, nfsuint64
                                tlen += 8;  /* To ensure null termination. */
                        left = DIRBLKSIZ - blksiz;
                        if (_GENERIC_DIRLEN(len) + NFSX_HYPER > left) {
-                               NFSBZERO(uio_iov_base(uiop), left);
+                               NFSBZERO(uiop->uio_iov->iov_base, left);
                                dp->d_reclen += left;
-                               uio_iov_base_add(uiop, left);
-                               uio_iov_len_add(uiop, -(left));
-                               uio_uio_resid_add(uiop, -(left));
+                               uiop->uio_iov->iov_base =
+                                   (char *)uiop->uio_iov->iov_base + left;
+                               uiop->uio_iov->iov_len -= left;
+                               uiop->uio_resid -= left;
                                uiop->uio_offset += left;
                                blksiz = 0;
                        }
                        if (_GENERIC_DIRLEN(len) + NFSX_HYPER >
-                           uio_uio_resid(uiop))
+                           uiop->uio_resid)
                                bigenough = 0;
                        if (bigenough) {
-                               dp = (struct dirent *)uio_iov_base(uiop);
+                               dp = (struct dirent *)uiop->uio_iov->iov_base;
                                dp->d_pad0 = dp->d_pad1 = 0;
                                dp->d_off = 0;
                                dp->d_namlen = len;
@@ -3193,21 +3199,24 @@ nfsrpc_readdir(vnode_t vp, struct uio *uiop, nfsuint64
                                blksiz += dp->d_reclen;
                                if (blksiz == DIRBLKSIZ)
                                        blksiz = 0;
-                               uio_uio_resid_add(uiop, -(DIRHDSIZ));
+                               uiop->uio_resid -= DIRHDSIZ;
                                uiop->uio_offset += DIRHDSIZ;
-                               uio_iov_base_add(uiop, DIRHDSIZ);
-                               uio_iov_len_add(uiop, -(DIRHDSIZ));
+                               uiop->uio_iov->iov_base =
+                                   (char *)uiop->uio_iov->iov_base + DIRHDSIZ;
+                               uiop->uio_iov->iov_len -= DIRHDSIZ;
                                error = nfsm_mbufuio(nd, uiop, len);
                                if (error)
                                        goto nfsmout;
-                               cp = uio_iov_base(uiop);
+                               cp = uiop->uio_iov->iov_base;
                                tlen -= len;
                                NFSBZERO(cp, tlen);
                                cp += tlen;     /* points to cookie storage */
                                tl2 = (u_int32_t *)cp;
-                               uio_iov_base_add(uiop, (tlen + NFSX_HYPER));
-                               uio_iov_len_add(uiop, -(tlen + NFSX_HYPER));
-                               uio_uio_resid_add(uiop, -(tlen + NFSX_HYPER));
+                               uiop->uio_iov->iov_base =
+                                   (char *)uiop->uio_iov->iov_base + tlen +
+                                   NFSX_HYPER;
+                               uiop->uio_iov->iov_len -= tlen + NFSX_HYPER;
+                               uiop->uio_resid -= tlen + NFSX_HYPER;
                                uiop->uio_offset += (tlen + NFSX_HYPER);
                        } else {
                                error = nfsm_advance(nd, NFSM_RNDUP(len), -1);
@@ -3290,11 +3299,12 @@ nfsrpc_readdir(vnode_t vp, struct uio *uiop, nfsuint64
         */
        if (blksiz > 0) {
                left = DIRBLKSIZ - blksiz;
-               NFSBZERO(uio_iov_base(uiop), left);
+               NFSBZERO(uiop->uio_iov->iov_base, left);
                dp->d_reclen += left;
-               uio_iov_base_add(uiop, left);
-               uio_iov_len_add(uiop, -(left));
-               uio_uio_resid_add(uiop, -(left));
+               uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base +
+                   left;
+               uiop->uio_iov->iov_len -= left;
+               uiop->uio_resid -= left;
                uiop->uio_offset += left;
        }
 
@@ -3305,7 +3315,7 @@ nfsrpc_readdir(vnode_t vp, struct uio *uiop, nfsuint64
         * Otherwise, return the eof flag from the server.
         */
        if (eofp) {
-               if (tresid == ((size_t)(uio_uio_resid(uiop))))
+               if (tresid == ((size_t)(uiop->uio_resid)))
                        *eofp = 1;
                else if (!bigenough)
                        *eofp = 0;
@@ -3316,17 +3326,18 @@ nfsrpc_readdir(vnode_t vp, struct uio *uiop, nfsuint64
        /*
         * Add extra empty records to any remaining DIRBLKSIZ chunks.
         */
-       while (uio_uio_resid(uiop) > 0 && uio_uio_resid(uiop) != tresid) {
-               dp = (struct dirent *)uio_iov_base(uiop);
+       while (uiop->uio_resid > 0 && uiop->uio_resid != tresid) {
+               dp = (struct dirent *)uiop->uio_iov->iov_base;
                NFSBZERO(dp, DIRBLKSIZ);
                dp->d_type = DT_UNKNOWN;
                tl = (u_int32_t *)&dp->d_name[4];
                *tl++ = cookie.lval[0];
                *tl = cookie.lval[1];
                dp->d_reclen = DIRBLKSIZ;
-               uio_iov_base_add(uiop, DIRBLKSIZ);
-               uio_iov_len_add(uiop, -(DIRBLKSIZ));
-               uio_uio_resid_add(uiop, -(DIRBLKSIZ));
+               uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base +
+                   DIRBLKSIZ;
+               uiop->uio_iov->iov_len -= DIRBLKSIZ;
+               uiop->uio_resid -= DIRBLKSIZ;
                uiop->uio_offset += DIRBLKSIZ;
        }
 
@@ -3371,7 +3382,7 @@ nfsrpc_readdirplus(vnode_t vp, struct uio *uiop, nfsui
        struct timespec dctime;
 
        KASSERT(uiop->uio_iovcnt == 1 &&
-           (uio_uio_resid(uiop) & (DIRBLKSIZ - 1)) == 0,
+           (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
            ("nfs readdirplusrpc bad uio"));
        ncookie.lval[0] = ncookie.lval[1] = 0;
        timespecclear(&dctime);
@@ -3382,7 +3393,7 @@ nfsrpc_readdirplus(vnode_t vp, struct uio *uiop, nfsui
        nd->nd_mrep = NULL;
        cookie.lval[0] = cookiep->nfsuquad[0];
        cookie.lval[1] = cookiep->nfsuquad[1];
-       tresid = uio_uio_resid(uiop);
+       tresid = uiop->uio_resid;
 
        /*
         * For NFSv4, first create the "." and ".." entries.
@@ -3473,7 +3484,7 @@ nfsrpc_readdirplus(vnode_t vp, struct uio *uiop, nfsui
                        if (error)
                            return (error);
                        nd->nd_mrep = NULL;
-                       dp = (struct dirent *)uio_iov_base(uiop);
+                       dp = (struct dirent *)uiop->uio_iov->iov_base;
                        dp->d_pad0 = dp->d_pad1 = 0;
                        dp->d_off = 0;
                        dp->d_type = DT_DIR;
@@ -3489,11 +3500,12 @@ nfsrpc_readdirplus(vnode_t vp, struct uio *uiop, nfsui
                        *tl++ = 0;
                        *tl = 0;
                        blksiz += dp->d_reclen;
-                       uio_uio_resid_add(uiop, -(dp->d_reclen));
+                       uiop->uio_resid -= dp->d_reclen;
                        uiop->uio_offset += dp->d_reclen;
-                       uio_iov_base_add(uiop, dp->d_reclen);
-                       uio_iov_len_add(uiop, -(dp->d_reclen));
-                       dp = (struct dirent *)uio_iov_base(uiop);
+                       uiop->uio_iov->iov_base =
+                           (char *)uiop->uio_iov->iov_base + dp->d_reclen;
+                       uiop->uio_iov->iov_len -= dp->d_reclen;
+                       dp = (struct dirent *)uiop->uio_iov->iov_base;
                        dp->d_pad0 = dp->d_pad1 = 0;
                        dp->d_off = 0;
                        dp->d_type = DT_DIR;
@@ -3510,10 +3522,11 @@ nfsrpc_readdirplus(vnode_t vp, struct uio *uiop, nfsui
                        *tl++ = 0;
                        *tl = 0;
                        blksiz += dp->d_reclen;
-                       uio_uio_resid_add(uiop, -(dp->d_reclen));
+                       uiop->uio_resid -= dp->d_reclen;
                        uiop->uio_offset += dp->d_reclen;
-                       uio_iov_base_add(uiop, dp->d_reclen);
-                       uio_iov_len_add(uiop, -(dp->d_reclen));
+                       uiop->uio_iov->iov_base =
+                           (char *)uiop->uio_iov->iov_base + dp->d_reclen;
+                       uiop->uio_iov->iov_len -= dp->d_reclen;
                }
                NFSREADDIRPLUS_ATTRBIT(&attrbits);
                if (gotmnton)
@@ -3589,19 +3602,20 @@ nfsrpc_readdirplus(vnode_t vp, struct uio *uiop, nfsui
                                tlen += 8;  /* To ensure null termination. */
                        left = DIRBLKSIZ - blksiz;
                        if (_GENERIC_DIRLEN(len) + NFSX_HYPER > left) {
-                               NFSBZERO(uio_iov_base(uiop), left);
+                               NFSBZERO(uiop->uio_iov->iov_base, left);
                                dp->d_reclen += left;
-                               uio_iov_base_add(uiop, left);
-                               uio_iov_len_add(uiop, -(left));
-                               uio_uio_resid_add(uiop, -(left));
+                               uiop->uio_iov->iov_base =
+                                   (char *)uiop->uio_iov->iov_base + left;
+                               uiop->uio_iov->iov_len -= left;
+                               uiop->uio_resid -= left;
                                uiop->uio_offset += left;
                                blksiz = 0;
                        }
                        if (_GENERIC_DIRLEN(len) + NFSX_HYPER >
-                           uio_uio_resid(uiop))
+                           uiop->uio_resid)
                                bigenough = 0;
                        if (bigenough) {
-                               dp = (struct dirent *)uio_iov_base(uiop);
+                               dp = (struct dirent *)uiop->uio_iov->iov_base;
                                dp->d_pad0 = dp->d_pad1 = 0;
                                dp->d_off = 0;
                                dp->d_namlen = len;
@@ -3611,17 +3625,18 @@ nfsrpc_readdirplus(vnode_t vp, struct uio *uiop, nfsui
                                blksiz += dp->d_reclen;
                                if (blksiz == DIRBLKSIZ)
                                        blksiz = 0;
-                               uio_uio_resid_add(uiop, -(DIRHDSIZ));
+                               uiop->uio_resid -= DIRHDSIZ;
                                uiop->uio_offset += DIRHDSIZ;
-                               uio_iov_base_add(uiop, DIRHDSIZ);
-                               uio_iov_len_add(uiop, -(DIRHDSIZ));
-                               cnp->cn_nameptr = uio_iov_base(uiop);
+                               uiop->uio_iov->iov_base =
+                                   (char *)uiop->uio_iov->iov_base + DIRHDSIZ;
+                               uiop->uio_iov->iov_len -= DIRHDSIZ;
+                               cnp->cn_nameptr = uiop->uio_iov->iov_base;
                                cnp->cn_namelen = len;
                                NFSCNHASHZERO(cnp);
                                error = nfsm_mbufuio(nd, uiop, len);
                                if (error)
                                        goto nfsmout;
-                               cp = uio_iov_base(uiop);
+                               cp = uiop->uio_iov->iov_base;
                                tlen -= len;
                                NFSBZERO(cp, tlen);
                                cp += tlen;     /* points to cookie storage */
@@ -3631,9 +3646,11 @@ nfsrpc_readdirplus(vnode_t vp, struct uio *uiop, nfsui
                                        isdotdot = 1;
                                else
                                        isdotdot = 0;
-                               uio_iov_base_add(uiop, (tlen + NFSX_HYPER));
-                               uio_iov_len_add(uiop, -(tlen + NFSX_HYPER));
-                               uio_uio_resid_add(uiop, -(tlen + NFSX_HYPER));
+                               uiop->uio_iov->iov_base =
+                                   (char *)uiop->uio_iov->iov_base + tlen +
+                                   NFSX_HYPER;
+                               uiop->uio_iov->iov_len -= tlen + NFSX_HYPER;
+                               uiop->uio_resid -= tlen + NFSX_HYPER;
                                uiop->uio_offset += (tlen + NFSX_HYPER);
                        } else {
                                error = nfsm_advance(nd, NFSM_RNDUP(len), -1);
@@ -3793,11 +3810,12 @@ nfsrpc_readdirplus(vnode_t vp, struct uio *uiop, nfsui
         */
        if (blksiz > 0) {
                left = DIRBLKSIZ - blksiz;
-               NFSBZERO(uio_iov_base(uiop), left);
+               NFSBZERO(uiop->uio_iov->iov_base, left);
                dp->d_reclen += left;
-               uio_iov_base_add(uiop, left);
-               uio_iov_len_add(uiop, -(left));
-               uio_uio_resid_add(uiop, -(left));
+               uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base +
+                   left;
+               uiop->uio_iov->iov_len -= left;
+               uiop->uio_resid -= left;
                uiop->uio_offset += left;
        }
 
@@ -3808,7 +3826,7 @@ nfsrpc_readdirplus(vnode_t vp, struct uio *uiop, nfsui
         * Otherwise, return the eof flag from the server.
         */
        if (eofp != NULL) {
-               if (tresid == uio_uio_resid(uiop))
+               if (tresid == uiop->uio_resid)
                        *eofp = 1;
                else if (!bigenough)
                        *eofp = 0;
@@ -3819,17 +3837,18 @@ nfsrpc_readdirplus(vnode_t vp, struct uio *uiop, nfsui
        /*
         * Add extra empty records to any remaining DIRBLKSIZ chunks.
         */
-       while (uio_uio_resid(uiop) > 0 && uio_uio_resid(uiop) != tresid) {
-               dp = (struct dirent *)uio_iov_base(uiop);
+       while (uiop->uio_resid > 0 && uiop->uio_resid != tresid) {
+               dp = (struct dirent *)uiop->uio_iov->iov_base;
                NFSBZERO(dp, DIRBLKSIZ);
                dp->d_type = DT_UNKNOWN;
                tl = (u_int32_t *)&dp->d_name[4];
                *tl++ = cookie.lval[0];
                *tl = cookie.lval[1];
                dp->d_reclen = DIRBLKSIZ;
-               uio_iov_base_add(uiop, DIRBLKSIZ);
-               uio_iov_len_add(uiop, -(DIRBLKSIZ));
-               uio_uio_resid_add(uiop, -(DIRBLKSIZ));
+               uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base +
+                   DIRBLKSIZ;
+               uiop->uio_iov->iov_len -= DIRBLKSIZ;
+               uiop->uio_resid -= DIRBLKSIZ;
                uiop->uio_offset += DIRBLKSIZ;
        }
 
@@ -6395,9 +6414,9 @@ nfsrpc_writeds(vnode_t vp, struct uio *uiop, int *iomo
                 * back.
                 */
                uiop->uio_offset -= len;
-               uio_uio_resid_add(uiop, len);
-               uio_iov_base_add(uiop, -len);
-               uio_iov_len_add(uiop, len);
+               uiop->uio_resid += len;
+               uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base - len;
+               uiop->uio_iov->iov_len += len;
                error = nd->nd_repstat;
        } else {
                if (vers == NFS_VER3) {
@@ -6415,10 +6434,11 @@ nfsrpc_writeds(vnode_t vp, struct uio *uiop, int *iomo
                        goto nfsmout;
                } else if (rlen < len) {
                        backup = len - rlen;
-                       uio_iov_base_add(uiop, -(backup));
-                       uio_iov_len_add(uiop, backup);
+                       uiop->uio_iov->iov_base =
+                           (char *)uiop->uio_iov->iov_base - backup;
+                       uiop->uio_iov->iov_len += backup;
                        uiop->uio_offset -= backup;
-                       uio_uio_resid_add(uiop, backup);
+                       uiop->uio_resid += backup;
                        len = rlen;
                }
                commit = fxdr_unsigned(int, *tl++);
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