ddc6c40075
- Change the cached mtime to a 'struct timespec' from a time_t. Improving the precision of the cached mtime tightens up NFS' "close-to-open" consistency considerably. - Always force an over-the-wire consistency check from nfs_open() (unless the file is marked modified). This further improves NFS' "close-to-open" consistency. Submitted by: Mohan Srinivasan mohans at yahoo-inc dot com
224 lines
6.9 KiB
C
224 lines
6.9 KiB
C
/* $FreeBSD$ */
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/* $Id: nfs4_vn_subs.c,v 1.9 2003/11/05 14:59:00 rees Exp $ */
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/*
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* copyright (c) 2003
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* the regents of the university of michigan
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* all rights reserved
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*
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* permission is granted to use, copy, create derivative works and redistribute
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* this software and such derivative works for any purpose, so long as the name
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* of the university of michigan is not used in any advertising or publicity
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* pertaining to the use or distribution of this software without specific,
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* written prior authorization. if the above copyright notice or any other
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* identification of the university of michigan is included in any copy of any
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* portion of this software, then the disclaimer below must also be included.
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*
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* this software is provided as is, without representation from the university
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* of michigan as to its fitness for any purpose, and without warranty by the
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* university of michigan of any kind, either express or implied, including
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* without limitation the implied warranties of merchantability and fitness for
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* a particular purpose. the regents of the university of michigan shall not be
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* liable for any damages, including special, indirect, incidental, or
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* consequential damages, with respect to any claim arising out of or in
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* connection with the use of the software, even if it has been or is hereafter
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* advised of the possibility of such damages.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/limits.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/module.h>
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#include <sys/mount.h>
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#include <sys/proc.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/sockio.h>
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#include <sys/vnode.h>
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#include <sys/types.h>
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#include <vm/vm.h>
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#include <vm/vm_extern.h>
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#include <vm/uma.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <rpc/rpcclnt.h>
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#include <nfs/rpcv2.h>
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#include <nfs/nfsproto.h>
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#include <nfsclient/nfs.h>
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#include <nfsclient/nfsmount.h>
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#include <nfs/xdr_subs.h>
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#include <nfsclient/nfsm_subs.h>
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#include <nfsclient/nfsdiskless.h>
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/* NFSv4 */
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#include <nfs4client/nfs4.h>
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#include <nfs4client/nfs4m_subs.h>
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#include <nfs4client/nfs4_vn.h>
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#include <nfsclient/nfsnode.h>
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void
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nfs4_vnop_loadattrcache(struct vnode *vp, struct nfsv4_fattr *fap,
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struct vattr *vaper)
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{
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struct vattr *vap;
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struct nfsnode *np;
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int32_t rdev;
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enum vtype vtyp;
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u_short vmode;
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struct timespec mtime;
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struct timeval tv;
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microtime(&tv);
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vtyp = nv3tov_type[fap->fa4_type & 0x7];
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vmode = (fap->fa4_valid & FA4V_MODE) ? fap->fa4_mode : 0777;
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rdev = (fap->fa4_valid & FA4V_RDEV) ?
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makedev(fap->fa4_rdev_major, fap->fa4_rdev_minor) : 0;
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if (fap->fa4_valid & FA4V_MTIME)
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mtime = fap->fa4_mtime;
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else
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bzero(&mtime, sizeof mtime);
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/*
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* If v_type == VNON it is a new node, so fill in the v_type,
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* n_mtime fields. Check to see if it represents a special
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* device, and if so, check for a possible alias. Once the
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* correct vnode has been obtained, fill in the rest of the
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* information.
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*/
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np = VTONFS(vp);
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vap = &np->n_vattr;
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if (vp->v_type != vtyp || np->n_mtime.tv_sec == 0) {
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bzero(vap, sizeof *vap);
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vp->v_type = vtyp;
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np->n_mtime.tv_sec = mtime.tv_sec;
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}
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vap->va_type = vtyp;
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vap->va_mode = (vmode & 07777);
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vap->va_rdev = rdev;
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vap->va_mtime = mtime;
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vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
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if (fap->fa4_valid & FA4V_NLINK)
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vap->va_nlink = fap->fa4_nlink;
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if (fap->fa4_valid & FA4V_UID)
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vap->va_uid = fap->fa4_uid;
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if (fap->fa4_valid & FA4V_GID)
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vap->va_gid = fap->fa4_gid;
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vap->va_size = fap->fa4_size;
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vap->va_blocksize = NFS_FABLKSIZE;
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vap->va_bytes = fap->fa4_size;
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if (fap->fa4_valid & FA4V_FILEID)
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vap->va_fileid = nfs_v4fileid4_to_fileid(fap->fa4_fileid);
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if (fap->fa4_valid & FA4V_ATIME)
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vap->va_atime = fap->fa4_atime;
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if (fap->fa4_valid & FA4V_CTIME)
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vap->va_ctime = fap->fa4_ctime;
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vap->va_flags = 0;
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vap->va_filerev = 0;
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/* XXX dontshrink flag? */
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if (vap->va_size != np->n_size) {
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if (vap->va_type == VREG) {
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if (np->n_flag & NMODIFIED) {
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if (vap->va_size < np->n_size)
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vap->va_size = np->n_size;
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else
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np->n_size = vap->va_size;
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} else
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np->n_size = vap->va_size;
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vnode_pager_setsize(vp, np->n_size);
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} else
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np->n_size = vap->va_size;
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}
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np->n_attrstamp = tv.tv_sec;
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if (vaper != NULL) {
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bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(*vap));
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if (np->n_flag & NCHG) {
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if (np->n_flag & NACC)
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vaper->va_atime = np->n_atim;
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if (np->n_flag & NUPD)
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vaper->va_mtime = np->n_mtim;
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}
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}
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}
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static uint64_t nfs_nullcookie = 0;
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/*
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* This function finds the directory cookie that corresponds to the
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* logical byte offset given.
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*/
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uint64_t *
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nfs4_getcookie(struct nfsnode *np, off_t off, int add)
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{
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struct nfsdmap *dp, *dp2;
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int pos;
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pos = (uoff_t)off / NFS_DIRBLKSIZ;
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if (pos == 0 || off < 0) {
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#ifdef DIAGNOSTIC
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if (add)
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panic("nfs getcookie add at <= 0");
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#endif
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return (&nfs_nullcookie);
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}
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pos--;
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dp = LIST_FIRST(&np->n_cookies);
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if (!dp) {
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if (add) {
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MALLOC(dp, struct nfsdmap *, sizeof (struct nfsdmap),
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M_NFSDIROFF, M_WAITOK);
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dp->ndm_eocookie = 0;
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LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list);
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} else
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return (NULL);
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}
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while (pos >= NFSNUMCOOKIES) {
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pos -= NFSNUMCOOKIES;
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if (LIST_NEXT(dp, ndm_list)) {
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if (!add && dp->ndm_eocookie < NFSNUMCOOKIES &&
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pos >= dp->ndm_eocookie)
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return (NULL);
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dp = LIST_NEXT(dp, ndm_list);
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} else if (add) {
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MALLOC(dp2, struct nfsdmap *, sizeof (struct nfsdmap),
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M_NFSDIROFF, M_WAITOK);
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dp2->ndm_eocookie = 0;
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LIST_INSERT_AFTER(dp, dp2, ndm_list);
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dp = dp2;
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} else
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return (NULL);
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}
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if (pos >= dp->ndm_eocookie) {
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if (add)
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dp->ndm_eocookie = pos + 1;
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else
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return (NULL);
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}
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return (&dp->ndm4_cookies[pos]);
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}
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/*
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* Invalidate cached directory information, except for the actual directory
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* blocks (which are invalidated separately).
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* Done mainly to avoid the use of stale offset cookies.
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*/
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void
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nfs4_invaldir(struct vnode *vp)
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{
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struct nfsnode *np = VTONFS(vp);
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np->n_direofoffset = 0;
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bzero(np->n4_cookieverf, NFSX_V4VERF);
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if (LIST_FIRST(&np->n_cookies))
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LIST_FIRST(&np->n_cookies)->ndm_eocookie = 0;
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}
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