Return to nfs_node.c CVS log

Up to [CSRG BSD Unix] / 43BSDReno / sys / nfs

Annotation of 43BSDReno/sys/nfs/nfs_node.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1989 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * This code is derived from software contributed to Berkeley by
        !             6:  * Rick Macklem at The University of Guelph.
        !             7:  *
        !             8:  * Redistribution is only permitted until one year after the first shipment
        !             9:  * of 4.4BSD by the Regents.  Otherwise, redistribution and use in source and
        !            10:  * binary forms are permitted provided that: (1) source distributions retain
        !            11:  * this entire copyright notice and comment, and (2) distributions including
        !            12:  * binaries display the following acknowledgement:  This product includes
        !            13:  * software developed by the University of California, Berkeley and its
        !            14:  * contributors'' in the documentation or other materials provided with the
        !            15:  * distribution and in all advertising materials mentioning features or use
        !            16:  * of this software.  Neither the name of the University nor the names of
        !            17:  * its contributors may be used to endorse or promote products derived from
        !            18:  * this software without specific prior written permission.
        !            19:  * THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            20:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            21:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            22:  *
        !            23:  *     @(#)nfs_node.c  7.29 (Berkeley) 6/28/90
        !            24:  */
        !            25: 
        !            26: #include "param.h"
        !            27: #include "systm.h"
        !            28: #include "user.h"
        !            29: #include "proc.h"
        !            30: #include "mount.h"
        !            31: #include "vnode.h"
        !            32: #include "errno.h"
        !            33: #include "nfsv2.h"
        !            34: #include "nfs.h"
        !            35: #include "nfsnode.h"
        !            36: #include "nfsmount.h"
        !            37: #include "kernel.h"
        !            38: #include "malloc.h"
        !            39: 
        !            40: /* The request list head */
        !            41: extern struct nfsreq nfsreqh;
        !            42: 
        !            43: #define        NFSNOHSZ        512
        !            44: #if    ((NFSNOHSZ&(NFSNOHSZ-1)) == 0)
        !            45: #define        NFSNOHASH(fhsum)        ((fhsum)&(NFSNOHSZ-1))
        !            46: #else
        !            47: #define        NFSNOHASH(fhsum)        (((unsigned)(fhsum))%NFSNOHSZ)
        !            48: #endif
        !            49: 
        !            50: union nhead {
        !            51:        union  nhead *nh_head[2];
        !            52:        struct nfsnode *nh_chain[2];
        !            53: } nhead[NFSNOHSZ];
        !            54: 
        !            55: #define TRUE   1
        !            56: #define        FALSE   0
        !            57: 
        !            58: /*
        !            59:  * Initialize hash links for nfsnodes
        !            60:  * and build nfsnode free list.
        !            61:  */
        !            62: nfs_nhinit()
        !            63: {
        !            64:        register int i;
        !            65:        register union  nhead *nh = nhead;
        !            66: 
        !            67: #ifndef lint
        !            68:        if (VN_MAXPRIVATE < sizeof(struct nfsnode))
        !            69:                panic("nfs_nhinit: too small");
        !            70: #endif /* not lint */
        !            71:        for (i = NFSNOHSZ; --i >= 0; nh++) {
        !            72:                nh->nh_head[0] = nh;
        !            73:                nh->nh_head[1] = nh;
        !            74:        }
        !            75: }
        !            76: 
        !            77: /*
        !            78:  * Compute an entry in the NFS hash table structure
        !            79:  */
        !            80: union nhead *
        !            81: nfs_hash(fhp)
        !            82:        register nfsv2fh_t *fhp;
        !            83: {
        !            84:        register u_char *fhpp;
        !            85:        register u_long fhsum;
        !            86:        int i;
        !            87: 
        !            88:        fhpp = &fhp->fh_bytes[0];
        !            89:        fhsum = 0;
        !            90:        for (i = 0; i < NFSX_FH; i++)
        !            91:                fhsum += *fhpp++;
        !            92:        return (&nhead[NFSNOHASH(fhsum)]);
        !            93: }
        !            94: 
        !            95: /*
        !            96:  * Look up a vnode/nfsnode by file handle.
        !            97:  * Callers must check for mount points!!
        !            98:  * In all cases, a pointer to a
        !            99:  * nfsnode structure is returned.
        !           100:  */
        !           101: nfs_nget(mntp, fhp, npp)
        !           102:        struct mount *mntp;
        !           103:        register nfsv2fh_t *fhp;
        !           104:        struct nfsnode **npp;
        !           105: {
        !           106:        register struct nfsnode *np;
        !           107:        register struct vnode *vp;
        !           108:        extern struct vnodeops nfsv2_vnodeops;
        !           109:        struct vnode *nvp;
        !           110:        union nhead *nh;
        !           111:        int error;
        !           112: 
        !           113:        nh = nfs_hash(fhp);
        !           114: loop:
        !           115:        for (np = nh->nh_chain[0]; np != (struct nfsnode *)nh; np = np->n_forw) {
        !           116:                if (mntp != NFSTOV(np)->v_mount ||
        !           117:                    bcmp((caddr_t)fhp, (caddr_t)&np->n_fh, NFSX_FH))
        !           118:                        continue;
        !           119:                if ((np->n_flag & NLOCKED) != 0) {
        !           120:                        np->n_flag |= NWANT;
        !           121:                        (void) tsleep((caddr_t)np, PINOD, "nfsnode", 0);
        !           122:                        goto loop;
        !           123:                }
        !           124:                vp = NFSTOV(np);
        !           125:                if (vget(vp))
        !           126:                        goto loop;
        !           127:                *npp = np;
        !           128:                return(0);
        !           129:        }
        !           130:        if (error = getnewvnode(VT_NFS, mntp, &nfsv2_vnodeops, &nvp)) {
        !           131:                *npp = 0;
        !           132:                return (error);
        !           133:        }
        !           134:        vp = nvp;
        !           135:        np = VTONFS(vp);
        !           136:        np->n_vnode = vp;
        !           137:        /*
        !           138:         * Insert the nfsnode in the hash queue for its new file handle
        !           139:         */
        !           140:        np->n_flag = 0;
        !           141:        insque(np, nh);
        !           142:        nfs_lock(vp);
        !           143:        bcopy((caddr_t)fhp, (caddr_t)&np->n_fh, NFSX_FH);
        !           144:        np->n_attrstamp = 0;
        !           145:        np->n_direofoffset = 0;
        !           146:        np->n_sillyrename = (struct sillyrename *)0;
        !           147:        np->n_size = 0;
        !           148:        np->n_mtime = 0;
        !           149:        *npp = np;
        !           150:        return (0);
        !           151: }
        !           152: 
        !           153: nfs_inactive(vp)
        !           154:        struct vnode *vp;
        !           155: {
        !           156:        register struct nfsnode *np;
        !           157:        register struct nameidata *ndp;
        !           158:        register struct sillyrename *sp;
        !           159:        struct nfsnode *dnp;
        !           160:        extern int prtactive;
        !           161: 
        !           162:        np = VTONFS(vp);
        !           163:        if (prtactive && vp->v_usecount != 0)
        !           164:                vprint("nfs_inactive: pushing active", vp);
        !           165:        nfs_lock(vp);
        !           166:        sp = np->n_sillyrename;
        !           167:        np->n_sillyrename = (struct sillyrename *)0;
        !           168:        if (sp) {
        !           169:                /*
        !           170:                 * Remove the silly file that was rename'd earlier
        !           171:                 */
        !           172:                ndp = &sp->s_namei;
        !           173:                if (!nfs_nget(vp->v_mount, &sp->s_fh, &dnp)) {
        !           174:                        ndp->ni_dvp = NFSTOV(dnp);
        !           175:                        nfs_removeit(ndp);
        !           176:                        nfs_nput(ndp->ni_dvp);
        !           177:                }
        !           178:                crfree(ndp->ni_cred);
        !           179:                free((caddr_t)sp, M_TEMP);
        !           180:        }
        !           181:        nfs_unlock(vp);
        !           182:        np->n_flag &= NMODIFIED;
        !           183: #ifdef notdef
        !           184:        /*
        !           185:         * Scan the request list for any requests left hanging about
        !           186:         */
        !           187:        s = splnet();
        !           188:        rep = nfsreqh.r_next;
        !           189:        while (rep && rep != &nfsreqh) {
        !           190:                if (rep->r_vp == vp) {
        !           191:                        rep->r_prev->r_next = rep2 = rep->r_next;
        !           192:                        rep->r_next->r_prev = rep->r_prev;
        !           193:                        m_freem(rep->r_mreq);
        !           194:                        if (rep->r_mrep != NULL)
        !           195:                                m_freem(rep->r_mrep);
        !           196:                        free((caddr_t)rep, M_NFSREQ);
        !           197:                        rep = rep2;
        !           198:                } else
        !           199:                        rep = rep->r_next;
        !           200:        }
        !           201:        splx(s);
        !           202: #endif
        !           203:        return (0);
        !           204: }
        !           205: 
        !           206: /*
        !           207:  * Reclaim an nfsnode so that it can be used for other purposes.
        !           208:  */
        !           209: nfs_reclaim(vp)
        !           210:        register struct vnode *vp;
        !           211: {
        !           212:        register struct nfsnode *np = VTONFS(vp);
        !           213:        extern int prtactive;
        !           214: 
        !           215:        if (prtactive && vp->v_usecount != 0)
        !           216:                vprint("nfs_reclaim: pushing active", vp);
        !           217:        /*
        !           218:         * Remove the nfsnode from its hash chain.
        !           219:         */
        !           220:        remque(np);
        !           221:        np->n_forw = np;
        !           222:        np->n_back = np;
        !           223:        cache_purge(vp);
        !           224:        np->n_flag = 0;
        !           225:        np->n_direofoffset = 0;
        !           226:        return (0);
        !           227: }
        !           228: 
        !           229: /*
        !           230:  * Lock an nfsnode
        !           231:  */
        !           232: nfs_lock(vp)
        !           233:        struct vnode *vp;
        !           234: {
        !           235:        register struct nfsnode *np = VTONFS(vp);
        !           236: 
        !           237:        while (np->n_flag & NLOCKED) {
        !           238:                np->n_flag |= NWANT;
        !           239:                if (np->n_lockholder == u.u_procp->p_pid)
        !           240:                        panic("locking against myself");
        !           241:                np->n_lockwaiter = u.u_procp->p_pid;
        !           242:                (void) tsleep((caddr_t)np, PINOD, "nfslock", 0);
        !           243:        }
        !           244:        np->n_lockwaiter = 0;
        !           245:        np->n_lockholder = u.u_procp->p_pid;
        !           246:        u.u_spare[0]++;
        !           247:        np->n_flag |= NLOCKED;
        !           248: }
        !           249: 
        !           250: /*
        !           251:  * Unlock an nfsnode
        !           252:  */
        !           253: nfs_unlock(vp)
        !           254:        struct vnode *vp;
        !           255: {
        !           256:        register struct nfsnode *np = VTONFS(vp);
        !           257: 
        !           258:        if ((np->n_flag & NLOCKED) == 0)
        !           259:                vprint("nfs_unlock: unlocked nfsnode", vp);
        !           260:        np->n_lockholder = 0;
        !           261:        u.u_spare[0]--;
        !           262:        np->n_flag &= ~NLOCKED;
        !           263:        if (np->n_flag & NWANT) {
        !           264:                np->n_flag &= ~NWANT;
        !           265:                wakeup((caddr_t)np);
        !           266:        }
        !           267: }
        !           268: 
        !           269: /*
        !           270:  * Check for a locked nfsnode
        !           271:  */
        !           272: nfs_islocked(vp)
        !           273:        struct vnode *vp;
        !           274: {
        !           275: 
        !           276:        if (VTONFS(vp)->n_flag & NLOCKED)
        !           277:                return (1);
        !           278:        return (0);
        !           279: }
        !           280: 
        !           281: /*
        !           282:  * Unlock and vrele()
        !           283:  * since I can't decide if dirs. should be locked, I will check for
        !           284:  * the lock and be flexible
        !           285:  */
        !           286: nfs_nput(vp)
        !           287:        struct vnode *vp;
        !           288: {
        !           289:        register struct nfsnode *np = VTONFS(vp);
        !           290: 
        !           291:        if (np->n_flag & NLOCKED)
        !           292:                nfs_unlock(vp);
        !           293:        vrele(vp);
        !           294: }
        !           295: 
        !           296: /*
        !           297:  * Nfs abort op, called after namei() when a CREATE/DELETE isn't actually
        !           298:  * done. Currently nothing to do.
        !           299:  */
        !           300: /* ARGSUSED */
        !           301: nfs_abortop(ndp)
        !           302:        struct nameidata *ndp;
        !           303: {
        !           304: 
        !           305:        return (0);
        !           306: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.