FreeBSD/Linux Kernel Cross Reference
sys/nfs/nfs_node.c

     /*      $NetBSD: nfs_node.c,v 1.126 2020/05/01 08:43:00 hannken Exp $   */
     
     /*
      * Copyright (c) 1989, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * Rick Macklem at The University of Guelph.
      *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)nfs_node.c  8.6 (Berkeley) 5/22/95
     */
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: nfs_node.c,v 1.126 2020/05/01 08:43:00 hannken Exp $");
    
    #ifdef _KERNEL_OPT
    #include "opt_nfs.h"
    #endif
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/proc.h>
    #include <sys/mount.h>
    #include <sys/namei.h>
    #include <sys/vnode.h>
    #include <sys/kernel.h>
    #include <sys/pool.h>
    #include <sys/lock.h>
    #include <sys/hash.h>
    #include <sys/kauth.h>
    
    #include <nfs/rpcv2.h>
    #include <nfs/nfsproto.h>
    #include <nfs/nfs.h>
    #include <nfs/nfsnode.h>
    #include <nfs/nfsmount.h>
    #include <nfs/nfs_var.h>
    
    struct pool nfs_node_pool;
    struct pool nfs_vattr_pool;
    static struct workqueue *nfs_sillyworkq;
    
    static void nfs_gop_size(struct vnode *, off_t, off_t *, int);
    static int nfs_gop_alloc(struct vnode *, off_t, off_t, int, kauth_cred_t);
    static int nfs_gop_write(struct vnode *, struct vm_page **, int, int);
    static void nfs_sillyworker(struct work *, void *);
    
    static const struct genfs_ops nfs_genfsops = {
            .gop_size = nfs_gop_size,
            .gop_alloc = nfs_gop_alloc,
            .gop_write = nfs_gop_write,
            .gop_putrange = genfs_gop_putrange,
    };
    
    /*
     * Reinitialize inode hash table.
     */
    void
    nfs_node_init(void)
    {
    
            pool_init(&nfs_node_pool, sizeof(struct nfsnode), 0, 0, 0, "nfsnodepl",
                &pool_allocator_nointr, IPL_NONE);
            pool_init(&nfs_vattr_pool, sizeof(struct vattr), 0, 0, 0, "nfsvapl",
                &pool_allocator_nointr, IPL_NONE);
            if (workqueue_create(&nfs_sillyworkq, "nfssilly", nfs_sillyworker,
                NULL, PRI_NONE, IPL_NONE, 0) != 0) {
                    panic("nfs_node_init");
            }
    }
    
    /*
     * Free resources previously allocated in nfs_node_reinit().
     */
    void
   nfs_node_done(void)
   {
   
           pool_destroy(&nfs_node_pool);
           pool_destroy(&nfs_vattr_pool);
           workqueue_destroy(nfs_sillyworkq);
   }
   
   /*
    * Initialize this vnode / nfs node pair.
    * Caller assures no other thread will try to load this node.
    */
   int
   nfs_loadvnode(struct mount *mp, struct vnode *vp,
       const void *key, size_t key_len, const void **new_key)
   {
           int fhsize = key_len;
           const nfsfh_t *fhp = key;
           struct nfsnode *np;
   
           /* Aloocate and initialize the nfsnode. */
           np = pool_get(&nfs_node_pool, PR_WAITOK);
           memset(np, 0, sizeof *np);
           if (fhsize > NFS_SMALLFH) {
                   np->n_fhp = kmem_alloc(fhsize, KM_SLEEP);
           } else
                   np->n_fhp = &np->n_fh;
           vp->v_tag = VT_NFS;
           vp->v_type = VNON;
           vp->v_op = nfsv2_vnodeop_p;
           vp->v_data = np;
           memcpy(np->n_fhp, fhp, fhsize);
           np->n_fhsize = fhsize;
           np->n_accstamp = -1;
           np->n_vattr = pool_get(&nfs_vattr_pool, PR_WAITOK);
           np->n_vnode = vp;
   
           /* Initialize genfs node. */
           genfs_node_init(vp, &nfs_genfsops);
           /*
            * Initialize read/write creds to useful values. VOP_OPEN will
            * overwrite these.
            */
           np->n_rcred = curlwp->l_cred;
           kauth_cred_hold(np->n_rcred);
           np->n_wcred = curlwp->l_cred;
           kauth_cred_hold(np->n_wcred);
           NFS_INVALIDATE_ATTRCACHE(np);
           uvm_vnp_setsize(vp, 0);
           *new_key = np->n_fhp;
           return 0;
   }
   
   /*
    * Look up a vnode/nfsnode by file handle.
    * Callers must check for mount points!!
    * In all cases, a pointer to a
    * nfsnode structure is returned.
    */
   int
   nfs_nget1(struct mount *mntp, nfsfh_t *fhp, int fhsize, struct nfsnode **npp,
       int lkflags)
   {
           int error;
           struct vnode *vp;
   
           error = vcache_get(mntp, fhp, fhsize, &vp);
           if (error)
                   return error;
           error = vn_lock(vp, LK_EXCLUSIVE | lkflags);
           if (error) {
                   vrele(vp);
                   return error;
           }
           *npp = VTONFS(vp);
           return 0;
   }
   
   int
   nfs_inactive(void *v)
   {
           struct vop_inactive_v2_args /* {
                   struct vnode *a_vp;
                   bool *a_recycle;
           } */ *ap = v;
           struct nfsnode *np;
           struct sillyrename *sp;
           struct vnode *vp = ap->a_vp;
   
           /* If we have a delayed truncation, do it now. */
           nfs_delayedtruncate(vp);
   
           np = VTONFS(vp);
           if (vp->v_type != VDIR) {
                   sp = np->n_sillyrename;
                   np->n_sillyrename = (struct sillyrename *)0;
           } else
                   sp = NULL;
           if (sp != NULL)
                   nfs_vinvalbuf(vp, 0, sp->s_cred, curlwp, 1);
           *ap->a_recycle = (np->n_flag & NREMOVED) != 0;
           np->n_flag &=
               (NMODIFIED | NFLUSHINPROG | NFLUSHWANT | NEOFVALID | NTRUNCDELAYED);
   
           if (vp->v_type == VDIR && np->n_dircache)
                   nfs_invaldircache(vp,
                       NFS_INVALDIRCACHE_FORCE | NFS_INVALDIRCACHE_KEEPEOF);
   
           if (sp != NULL) {
                   workqueue_enqueue(nfs_sillyworkq, &sp->s_work, NULL);
           }
   
           return (0);
   }
   
   /*
    * Reclaim an nfsnode so that it can be used for other purposes.
    */
   int
   nfs_reclaim(void *v)
   {
           struct vop_reclaim_v2_args /* {
                   struct vnode *a_vp;
           } */ *ap = v;
           struct vnode *vp = ap->a_vp;
           struct nfsnode *np = VTONFS(vp);
   
           VOP_UNLOCK(vp);
   
           /*
            * Free up any directory cookie structures and
            * large file handle structures that might be associated with
            * this nfs node.
            */
           if (vp->v_type == VDIR && np->n_dircache != NULL) {
                   nfs_invaldircache(vp, NFS_INVALDIRCACHE_FORCE);
                   hashdone(np->n_dircache, HASH_LIST, nfsdirhashmask);
           }
           KASSERT(np->n_dirgens == NULL);
   
           if (np->n_fhsize > NFS_SMALLFH)
                   kmem_free(np->n_fhp, np->n_fhsize);
   
           pool_put(&nfs_vattr_pool, np->n_vattr);
           if (np->n_rcred)
                   kauth_cred_free(np->n_rcred);
   
           if (np->n_wcred)
                   kauth_cred_free(np->n_wcred);
   
           if (vp->v_type == VREG) {
                   mutex_destroy(&np->n_commitlock);
           }
           genfs_node_destroy(vp);
           pool_put(&nfs_node_pool, np);
           vp->v_data = NULL;
           return (0);
   }
   
   void
   nfs_gop_size(struct vnode *vp, off_t size, off_t *eobp, int flags)
   {
   
           *eobp = MAX(size, vp->v_size);
   }
   
   int
   nfs_gop_alloc(struct vnode *vp, off_t off, off_t len, int flags,
       kauth_cred_t cred)
   {
   
           return 0;
   }
   
   int
   nfs_gop_write(struct vnode *vp, struct vm_page **pgs, int npages, int flags)
   {
           int i;
   
           rw_enter(vp->v_uobj.vmobjlock, RW_WRITER);
           for (i = 0; i < npages; i++) {
                   pmap_page_protect(pgs[i], VM_PROT_READ);
           }
           rw_exit(vp->v_uobj.vmobjlock);
   
           return genfs_gop_write(vp, pgs, npages, flags);
   }
   
   /*
    * Remove a silly file that was rename'd earlier
    */
   static void
   nfs_sillyworker(struct work *work, void *arg)
   {
           struct sillyrename *sp;
           int error;
   
           sp = (struct sillyrename *)work;
           error = vn_lock(sp->s_dvp, LK_EXCLUSIVE);
           if (error || sp->s_dvp->v_data == NULL) {
                   /* XXX should recover */
                   printf("%s: vp=%p error=%d\n", __func__, sp->s_dvp, error);
                   if (error == 0) {
                           vput(sp->s_dvp);
                   } else {
                           vrele(sp->s_dvp);
                   }
           } else {
                   nfs_removeit(sp);
                   vput(sp->s_dvp);
           }
           kauth_cred_free(sp->s_cred);
           kmem_free(sp, sizeof(*sp));
   }

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