dc6dd1259f
mail: The problem seems to originate with NFS's postop_attr information that is returned with a read or write RPC. Within a vm_fault context, the code cannot deal with vnode_pager_setsize() shrinking a vnode. The workaround in the patch below stops the nfsm_postop_attr() macro from ever shrinking a vnode. If the new size in the postop_attr information is smaller, then it just sets the nfsnode n_attrstamp to 0 to stop the wrong size getting used in the future. This change only affects postop_attr attributes; the nfsm_loadattr() macro works as normal. The change is implemented by adding a new argument to nfs_loadattrcache() called 'dontshrink'. When this is non-zero, nfs_loadattrcache() will never reduce the vnode/nfsnode size; instead it zeros n_attrstamp. There remain other was processes can get stuck in vmopar. Submitted by: Ian Dowse <iedowse@maths.tcd.ie> Reviewed by: dillon Tested by: Vadim Belman <voland@lflat.org>
565 lines
15 KiB
C
565 lines
15 KiB
C
/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Rick Macklem at The University of Guelph.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)nfsm_subs.h 8.2 (Berkeley) 3/30/95
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* $FreeBSD$
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*/
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#ifndef _NFS_NFSM_SUBS_H_
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#define _NFS_NFSM_SUBS_H_
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struct ucred;
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struct vnode;
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/*
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* These macros do strange and peculiar things to mbuf chains for
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* the assistance of the nfs code. To attempt to use them for any
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* other purpose will be dangerous. (they make weird assumptions)
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*/
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/*
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* First define what the actual subs. return
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*/
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struct mbuf *nfsm_reqh __P((struct vnode *vp, u_long procid, int hsiz,
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caddr_t *bposp));
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struct mbuf *nfsm_rpchead __P((struct ucred *cr, int nmflag, int procid,
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int auth_type, int auth_len, char *auth_str,
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int verf_len, char *verf_str,
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struct mbuf *mrest, int mrest_len,
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struct mbuf **mbp, u_int32_t *xidp));
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#define M_HASCL(m) ((m)->m_flags & M_EXT)
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#define NFSMINOFF(m) \
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do { \
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if (M_HASCL(m)) \
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(m)->m_data = (m)->m_ext.ext_buf; \
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else if ((m)->m_flags & M_PKTHDR) \
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(m)->m_data = (m)->m_pktdat; \
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else \
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(m)->m_data = (m)->m_dat; \
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} while (0)
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#define NFSMADV(m, s) \
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do { \
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(m)->m_data += (s); \
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} while (0)
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#define NFSMSIZ(m) ((M_HASCL(m))?MCLBYTES: \
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(((m)->m_flags & M_PKTHDR)?MHLEN:MLEN))
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/*
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* Now for the macros that do the simple stuff and call the functions
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* for the hard stuff.
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* These macros use several vars. declared in nfsm_reqhead and these
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* vars. must not be used elsewhere unless you are careful not to corrupt
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* them. The vars. starting with pN and tN (N=1,2,3,..) are temporaries
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* that may be used so long as the value is not expected to retained
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* after a macro.
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* I know, this is kind of dorkey, but it makes the actual op functions
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* fairly clean and deals with the mess caused by the xdr discriminating
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* unions.
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*/
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#define nfsm_build(a,c,s) \
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do { \
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if ((s) > M_TRAILINGSPACE(mb)) { \
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MGET(mb2, M_WAIT, MT_DATA); \
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if ((s) > MLEN) \
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panic("build > MLEN"); \
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mb->m_next = mb2; \
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mb = mb2; \
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mb->m_len = 0; \
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bpos = mtod(mb, caddr_t); \
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} \
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(a) = (c)(bpos); \
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mb->m_len += (s); \
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bpos += (s); \
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} while (0)
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#define nfsm_dissect(a, c, s) \
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do { \
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t1 = mtod(md, caddr_t)+md->m_len-dpos; \
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if (t1 >= (s)) { \
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(a) = (c)(dpos); \
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dpos += (s); \
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} else if ((t1 = nfsm_disct(&md, &dpos, (s), t1, &cp2)) != 0){ \
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error = t1; \
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m_freem(mrep); \
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goto nfsmout; \
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} else { \
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(a) = (c)cp2; \
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} \
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} while (0)
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#define nfsm_fhtom(v, v3) \
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do { \
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if (v3) { \
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t2 = nfsm_rndup(VTONFS(v)->n_fhsize) + NFSX_UNSIGNED; \
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if (t2 <= M_TRAILINGSPACE(mb)) { \
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nfsm_build(tl, u_int32_t *, t2); \
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*tl++ = txdr_unsigned(VTONFS(v)->n_fhsize); \
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*(tl + ((t2>>2) - 2)) = 0; \
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bcopy((caddr_t)VTONFS(v)->n_fhp,(caddr_t)tl, \
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VTONFS(v)->n_fhsize); \
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} else if ((t2 = nfsm_strtmbuf(&mb, &bpos, \
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(caddr_t)VTONFS(v)->n_fhp, \
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VTONFS(v)->n_fhsize)) != 0) { \
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error = t2; \
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m_freem(mreq); \
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goto nfsmout; \
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} \
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} else { \
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nfsm_build(cp, caddr_t, NFSX_V2FH); \
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bcopy((caddr_t)VTONFS(v)->n_fhp, cp, NFSX_V2FH); \
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} \
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} while (0)
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#define nfsm_srvfhtom(f, v3) \
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do { \
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if (v3) { \
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nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED + NFSX_V3FH);\
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*tl++ = txdr_unsigned(NFSX_V3FH); \
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bcopy((caddr_t)(f), (caddr_t)tl, NFSX_V3FH); \
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} else { \
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nfsm_build(cp, caddr_t, NFSX_V2FH); \
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bcopy((caddr_t)(f), cp, NFSX_V2FH); \
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} \
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} while (0)
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#define nfsm_srvpostop_fh(f) \
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do { \
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nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED + NFSX_V3FH); \
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*tl++ = nfs_true; \
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*tl++ = txdr_unsigned(NFSX_V3FH); \
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bcopy((caddr_t)(f), (caddr_t)tl, NFSX_V3FH); \
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} while (0)
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#define nfsm_mtofh(d, v, v3, f) \
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do { \
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struct nfsnode *ttnp; nfsfh_t *ttfhp; int ttfhsize; \
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if (v3) { \
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nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); \
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(f) = fxdr_unsigned(int, *tl); \
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} else \
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(f) = 1; \
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if (f) { \
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nfsm_getfh(ttfhp, ttfhsize, (v3)); \
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if ((t1 = nfs_nget((d)->v_mount, ttfhp, ttfhsize, \
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&ttnp)) != 0) { \
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error = t1; \
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m_freem(mrep); \
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goto nfsmout; \
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} \
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(v) = NFSTOV(ttnp); \
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} \
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if (v3) { \
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nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); \
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if (f) \
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(f) = fxdr_unsigned(int, *tl); \
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else if (fxdr_unsigned(int, *tl)) \
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nfsm_adv(NFSX_V3FATTR); \
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} \
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if (f) \
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nfsm_loadattr((v), (struct vattr *)0); \
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} while (0)
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#define nfsm_getfh(f, s, v3) \
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do { \
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if (v3) { \
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nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); \
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if (((s) = fxdr_unsigned(int, *tl)) <= 0 || \
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(s) > NFSX_V3FHMAX) { \
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m_freem(mrep); \
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error = EBADRPC; \
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goto nfsmout; \
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} \
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} else \
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(s) = NFSX_V2FH; \
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nfsm_dissect((f), nfsfh_t *, nfsm_rndup(s)); \
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} while (0)
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#define nfsm_loadattr(v, a) \
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do { \
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struct vnode *ttvp = (v); \
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if ((t1 = nfs_loadattrcache(&ttvp, &md, &dpos, (a), 0)) != 0) { \
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error = t1; \
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m_freem(mrep); \
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goto nfsmout; \
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} \
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(v) = ttvp; \
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} while (0)
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#define nfsm_postop_attr(v, f) \
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do { \
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struct vnode *ttvp = (v); \
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nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); \
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if (((f) = fxdr_unsigned(int, *tl)) != 0) { \
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if ((t1 = nfs_loadattrcache(&ttvp, &md, &dpos, \
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(struct vattr *)0, 1)) != 0) { \
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error = t1; \
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(f) = 0; \
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m_freem(mrep); \
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goto nfsmout; \
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} \
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(v) = ttvp; \
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} \
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} while (0)
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/* Used as (f) for nfsm_wcc_data() */
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#define NFSV3_WCCRATTR 0
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#define NFSV3_WCCCHK 1
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#define nfsm_wcc_data(v, f) \
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do { \
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int ttattrf, ttretf = 0; \
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nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); \
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if (*tl == nfs_true) { \
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nfsm_dissect(tl, u_int32_t *, 6 * NFSX_UNSIGNED); \
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if (f) \
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ttretf = (VTONFS(v)->n_mtime == \
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fxdr_unsigned(u_int32_t, *(tl + 2))); \
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} \
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nfsm_postop_attr((v), ttattrf); \
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if (f) { \
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(f) = ttretf; \
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} else { \
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(f) = ttattrf; \
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} \
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} while (0)
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/* If full is true, set all fields, otherwise just set mode and time fields */
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#define nfsm_v3attrbuild(a, full) \
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do { \
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if ((a)->va_mode != (mode_t)VNOVAL) { \
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nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); \
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*tl++ = nfs_true; \
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*tl = txdr_unsigned((a)->va_mode); \
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} else { \
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nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); \
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*tl = nfs_false; \
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} \
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if ((full) && (a)->va_uid != (uid_t)VNOVAL) { \
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nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); \
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*tl++ = nfs_true; \
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*tl = txdr_unsigned((a)->va_uid); \
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} else { \
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nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); \
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*tl = nfs_false; \
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} \
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if ((full) && (a)->va_gid != (gid_t)VNOVAL) { \
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nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); \
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*tl++ = nfs_true; \
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*tl = txdr_unsigned((a)->va_gid); \
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} else { \
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nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); \
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*tl = nfs_false; \
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} \
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if ((full) && (a)->va_size != VNOVAL) { \
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nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED); \
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*tl++ = nfs_true; \
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txdr_hyper((a)->va_size, tl); \
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} else { \
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nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); \
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*tl = nfs_false; \
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} \
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if ((a)->va_atime.tv_sec != VNOVAL) { \
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if ((a)->va_atime.tv_sec != time_second) { \
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nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED);\
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*tl++ = txdr_unsigned(NFSV3SATTRTIME_TOCLIENT);\
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txdr_nfsv3time(&(a)->va_atime, tl); \
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} else { \
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nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); \
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*tl = txdr_unsigned(NFSV3SATTRTIME_TOSERVER); \
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} \
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} else { \
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nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); \
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*tl = txdr_unsigned(NFSV3SATTRTIME_DONTCHANGE); \
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} \
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if ((a)->va_mtime.tv_sec != VNOVAL) { \
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if ((a)->va_mtime.tv_sec != time_second) { \
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nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED);\
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*tl++ = txdr_unsigned(NFSV3SATTRTIME_TOCLIENT);\
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txdr_nfsv3time(&(a)->va_mtime, tl); \
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} else { \
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nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); \
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*tl = txdr_unsigned(NFSV3SATTRTIME_TOSERVER); \
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} \
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} else { \
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nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); \
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*tl = txdr_unsigned(NFSV3SATTRTIME_DONTCHANGE); \
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} \
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} while (0)
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#define nfsm_strsiz(s,m) \
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do { \
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nfsm_dissect(tl,u_int32_t *,NFSX_UNSIGNED); \
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if (((s) = fxdr_unsigned(int32_t,*tl)) > (m)) { \
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m_freem(mrep); \
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error = EBADRPC; \
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goto nfsmout; \
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} \
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} while (0)
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#define nfsm_srvstrsiz(s,m) \
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do { \
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nfsm_dissect(tl,u_int32_t *,NFSX_UNSIGNED); \
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if (((s) = fxdr_unsigned(int32_t,*tl)) > (m) || (s) <= 0) { \
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error = EBADRPC; \
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nfsm_reply(0); \
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} \
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} while (0)
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#define nfsm_srvnamesiz(s) \
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do { \
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nfsm_dissect(tl,u_int32_t *,NFSX_UNSIGNED); \
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if (((s) = fxdr_unsigned(int32_t,*tl)) > NFS_MAXNAMLEN) \
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error = NFSERR_NAMETOL; \
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if ((s) <= 0) \
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error = EBADRPC; \
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if (error) \
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nfsm_reply(0); \
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} while (0)
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#define nfsm_mtouio(p,s) \
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do {\
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if ((s) > 0 && \
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(t1 = nfsm_mbuftouio(&md,(p),(s),&dpos)) != 0) { \
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error = t1; \
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m_freem(mrep); \
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goto nfsmout; \
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} \
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} while (0)
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#define nfsm_uiotom(p,s) \
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do { \
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if ((t1 = nfsm_uiotombuf((p),&mb,(s),&bpos)) != 0) { \
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error = t1; \
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m_freem(mreq); \
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goto nfsmout; \
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} \
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} while (0)
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#define nfsm_reqhead(v,a,s) \
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do { \
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mb = mreq = nfsm_reqh((v),(a),(s),&bpos); \
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} while (0)
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#define nfsm_reqdone \
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do { \
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m_freem(mrep); \
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nfsmout: \
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} while (0)
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#define nfsm_rndup(a) (((a)+3)&(~0x3))
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#define nfsm_request(v, t, p, c) \
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do { \
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if ((error = nfs_request((v), mreq, (t), (p), \
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(c), &mrep, &md, &dpos)) != 0) { \
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if (error & NFSERR_RETERR) \
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error &= ~NFSERR_RETERR; \
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else \
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goto nfsmout; \
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} \
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} while (0)
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#define nfsm_strtom(a,s,m) \
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do {\
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if ((s) > (m)) { \
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m_freem(mreq); \
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error = ENAMETOOLONG; \
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goto nfsmout; \
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} \
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t2 = nfsm_rndup(s)+NFSX_UNSIGNED; \
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if (t2 <= M_TRAILINGSPACE(mb)) { \
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nfsm_build(tl,u_int32_t *,t2); \
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*tl++ = txdr_unsigned(s); \
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*(tl+((t2>>2)-2)) = 0; \
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bcopy((const char *)(a), (caddr_t)tl, (s)); \
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} else if ((t2 = nfsm_strtmbuf(&mb, &bpos, (a), (s))) != 0) { \
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error = t2; \
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m_freem(mreq); \
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goto nfsmout; \
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} \
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} while (0)
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#define nfsm_srvdone \
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do { \
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nfsmout: \
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return (error); \
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} while (0)
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|
|
|
#define nfsm_reply(s) \
|
|
do { \
|
|
nfsd->nd_repstat = error; \
|
|
if (error && !(nfsd->nd_flag & ND_NFSV3)) \
|
|
(void) nfs_rephead(0, nfsd, slp, error, cache, &frev, \
|
|
mrq, &mb, &bpos); \
|
|
else \
|
|
(void) nfs_rephead((s), nfsd, slp, error, cache, &frev, \
|
|
mrq, &mb, &bpos); \
|
|
if (mrep != NULL) { \
|
|
m_freem(mrep); \
|
|
mrep = NULL; \
|
|
} \
|
|
mreq = *mrq; \
|
|
if (error && (!(nfsd->nd_flag & ND_NFSV3) || \
|
|
error == EBADRPC)) { \
|
|
error = 0; \
|
|
goto nfsmout; \
|
|
} \
|
|
} while (0)
|
|
|
|
#define nfsm_writereply(s, v3) \
|
|
do { \
|
|
nfsd->nd_repstat = error; \
|
|
if (error && !(v3)) \
|
|
(void) nfs_rephead(0, nfsd, slp, error, cache, &frev, \
|
|
&mreq, &mb, &bpos); \
|
|
else \
|
|
(void) nfs_rephead((s), nfsd, slp, error, cache, &frev, \
|
|
&mreq, &mb, &bpos); \
|
|
} while (0)
|
|
|
|
#define nfsm_adv(s) \
|
|
do { \
|
|
t1 = mtod(md, caddr_t)+md->m_len-dpos; \
|
|
if (t1 >= (s)) { \
|
|
dpos += (s); \
|
|
} else if ((t1 = nfs_adv(&md, &dpos, (s), t1)) != 0) { \
|
|
error = t1; \
|
|
m_freem(mrep); \
|
|
goto nfsmout; \
|
|
} \
|
|
} while (0)
|
|
|
|
#define nfsm_srvmtofh(f) \
|
|
do { \
|
|
int fhlen; \
|
|
if (nfsd->nd_flag & ND_NFSV3) { \
|
|
nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); \
|
|
fhlen = fxdr_unsigned(int, *tl); \
|
|
if (fhlen != 0 && fhlen != NFSX_V3FH) { \
|
|
error = EBADRPC; \
|
|
nfsm_reply(0); \
|
|
} \
|
|
} else { \
|
|
fhlen = NFSX_V2FH; \
|
|
} \
|
|
if (fhlen != 0) { \
|
|
nfsm_dissect(tl, u_int32_t *, fhlen); \
|
|
bcopy((caddr_t)tl, (caddr_t)(f), fhlen); \
|
|
} else {\
|
|
bzero((caddr_t)(f), NFSX_V3FH); \
|
|
} \
|
|
} while (0)
|
|
|
|
#define nfsm_clget \
|
|
do { \
|
|
if (bp >= be) { \
|
|
if (mp == mb) \
|
|
mp->m_len += bp-bpos; \
|
|
MGET(mp, M_WAIT, MT_DATA); \
|
|
MCLGET(mp, M_WAIT); \
|
|
mp->m_len = NFSMSIZ(mp); \
|
|
mp2->m_next = mp; \
|
|
mp2 = mp; \
|
|
bp = mtod(mp, caddr_t); \
|
|
be = bp+mp->m_len; \
|
|
} \
|
|
tl = (u_int32_t *)bp; \
|
|
} while (0)
|
|
|
|
#define nfsm_srvfillattr(a, f) \
|
|
do { \
|
|
nfsm_srvfattr(nfsd, (a), (f)); \
|
|
} while (0)
|
|
|
|
#define nfsm_srvwcc_data(br, b, ar, a) \
|
|
do { \
|
|
nfsm_srvwcc(nfsd, (br), (b), (ar), (a), &mb, &bpos); \
|
|
} while (0)
|
|
|
|
#define nfsm_srvpostop_attr(r, a) \
|
|
do { \
|
|
nfsm_srvpostopattr(nfsd, (r), (a), &mb, &bpos); \
|
|
} while (0)
|
|
|
|
#define nfsm_srvsattr(a) \
|
|
do { \
|
|
nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); \
|
|
if (*tl == nfs_true) { \
|
|
nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); \
|
|
(a)->va_mode = nfstov_mode(*tl); \
|
|
} \
|
|
nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); \
|
|
if (*tl == nfs_true) { \
|
|
nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); \
|
|
(a)->va_uid = fxdr_unsigned(uid_t, *tl); \
|
|
} \
|
|
nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); \
|
|
if (*tl == nfs_true) { \
|
|
nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); \
|
|
(a)->va_gid = fxdr_unsigned(gid_t, *tl); \
|
|
} \
|
|
nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); \
|
|
if (*tl == nfs_true) { \
|
|
nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); \
|
|
(a)->va_size = fxdr_hyper(tl); \
|
|
} \
|
|
nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); \
|
|
switch (fxdr_unsigned(int, *tl)) { \
|
|
case NFSV3SATTRTIME_TOCLIENT: \
|
|
nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); \
|
|
fxdr_nfsv3time(tl, &(a)->va_atime); \
|
|
break; \
|
|
case NFSV3SATTRTIME_TOSERVER: \
|
|
getnanotime(&(a)->va_atime); \
|
|
break; \
|
|
}; \
|
|
nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); \
|
|
switch (fxdr_unsigned(int, *tl)) { \
|
|
case NFSV3SATTRTIME_TOCLIENT: \
|
|
nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); \
|
|
fxdr_nfsv3time(tl, &(a)->va_mtime); \
|
|
break; \
|
|
case NFSV3SATTRTIME_TOSERVER: \
|
|
getnanotime(&(a)->va_mtime); \
|
|
break; \
|
|
} \
|
|
} while (0)
|
|
|
|
#endif
|