The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/fs/nwfs/nwfs_node.c

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    1 /*-
    2  * Copyright (c) 1999, 2000 Boris Popov
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/9.0/sys/fs/nwfs/nwfs_node.c 211531 2010-08-20 19:46:50Z jhb $
   27  */
   28 #include <sys/param.h>
   29 #include <sys/systm.h>
   30 #include <sys/kernel.h>
   31 #include <sys/lock.h>
   32 #include <sys/malloc.h>
   33 #include <sys/mount.h>
   34 #include <sys/mutex.h>
   35 #include <sys/proc.h>
   36 #include <sys/queue.h>
   37 #include <sys/sx.h>
   38 #include <sys/sysctl.h>
   39 #include <sys/time.h>
   40 #include <sys/vnode.h>
   41 
   42 #include <vm/vm.h>
   43 #include <vm/vm_extern.h>
   44 #include <vm/vm_page.h>
   45 #include <vm/vm_object.h>
   46 
   47 #include <netncp/ncp.h>
   48 #include <netncp/ncp_conn.h>
   49 #include <netncp/ncp_subr.h>
   50 
   51 #include <fs/nwfs/nwfs.h>
   52 #include <fs/nwfs/nwfs_mount.h>
   53 #include <fs/nwfs/nwfs_node.h>
   54 #include <fs/nwfs/nwfs_subr.h>
   55 
   56 #define NWNOHASH(fhsum) (&nwhashtbl[(fhsum.f_id) & nwnodehash])
   57 
   58 static LIST_HEAD(nwnode_hash_head,nwnode) *nwhashtbl;
   59 static u_long nwnodehash;
   60 static struct sx nwhashlock;
   61 
   62 static MALLOC_DEFINE(M_NWNODE, "nwfs_node", "NWFS vnode private part");
   63 static MALLOC_DEFINE(M_NWFSHASH, "nwfs_hash", "NWFS has table");
   64 
   65 static int nwfs_sysctl_vnprint(SYSCTL_HANDLER_ARGS);
   66 
   67 SYSCTL_DECL(_vfs_nwfs);
   68 
   69 SYSCTL_PROC(_vfs_nwfs, OID_AUTO, vnprint, CTLFLAG_WR|CTLTYPE_OPAQUE,
   70             NULL, 0, nwfs_sysctl_vnprint, "S,vnlist", "vnode hash");
   71 
   72 void
   73 nwfs_hash_init(void) {
   74         nwhashtbl = hashinit(desiredvnodes, M_NWFSHASH, &nwnodehash);
   75         sx_init(&nwhashlock, "nwfshl");
   76 }
   77 
   78 void
   79 nwfs_hash_free(void) {
   80         sx_destroy(&nwhashlock);
   81         free(nwhashtbl, M_NWFSHASH);
   82 }
   83 
   84 int
   85 nwfs_sysctl_vnprint(SYSCTL_HANDLER_ARGS) {
   86         struct nwnode *np;
   87         struct nwnode_hash_head *nhpp;
   88         struct vnode *vp;
   89         int i;
   90 
   91         if (nwfs_debuglevel == 0)
   92                 return 0;
   93         printf("Name:uc:hc:fid:pfid\n");
   94         for(i = 0; i <= nwnodehash; i++) {
   95                 nhpp = &nwhashtbl[i];
   96                 LIST_FOREACH(np, nhpp, n_hash) {
   97                         vp = NWTOV(np);
   98                         vprint("", vp);
   99                         printf("%s:%d:%d:%d:%d\n",np->n_name,vrefcnt(vp),
  100                             vp->v_holdcnt,np->n_fid.f_id, np->n_fid.f_parent);
  101                 }
  102         }
  103         return 0;
  104 }
  105 
  106 /*
  107  * Search nwnode with given fid.
  108  * Hash list should be locked by caller.
  109  */
  110 static int
  111 nwfs_hashlookup(struct nwmount *nmp, ncpfid fid, struct nwnode **npp)
  112 {
  113         struct nwnode *np;
  114         struct nwnode_hash_head *nhpp;
  115 
  116         sx_assert(&nwhashlock, SA_XLOCKED);
  117 
  118         nhpp = NWNOHASH(fid);
  119         LIST_FOREACH(np, nhpp, n_hash) {
  120                 if (nmp != np->n_mount || !NWCMPF(&fid, &np->n_fid))
  121                         continue;
  122                 if (npp)
  123                         *npp = np;
  124                 return 0;
  125         }
  126         return ENOENT;
  127 }
  128 
  129 /*
  130  * Allocate new nwfsnode/vnode from given nwnode. 
  131  * Vnode referenced and not locked.
  132  */
  133 static int
  134 nwfs_allocvp(struct mount *mp, ncpfid fid, struct nw_entry_info *fap,
  135         struct vnode *dvp, struct vnode **vpp)
  136 {
  137         struct nwnode *np;
  138         struct nwnode_hash_head *nhpp;
  139         struct nwmount *nmp = VFSTONWFS(mp);
  140         struct vnode *vp;
  141         int error;
  142 
  143 loop:
  144         sx_xlock(&nwhashlock);
  145 rescan:
  146         if (nwfs_hashlookup(nmp, fid, &np) == 0) {
  147                 vp = NWTOV(np);
  148                 VI_LOCK(vp);
  149                 sx_xunlock(&nwhashlock);
  150                 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, curthread))
  151                         goto loop;
  152                 if (fap)
  153                         np->n_attr = fap->attributes;
  154                 *vpp = vp;
  155                 return(0);
  156         }
  157         sx_xunlock(&nwhashlock);
  158 
  159         if (fap == NULL || ((fap->attributes & aDIR) == 0 && dvp == NULL))
  160                 panic("nwfs_allocvp: fap = %p, dvp = %p\n", fap, dvp);
  161         /*
  162          * Do the MALLOC before the getnewvnode since doing so afterward
  163          * might cause a bogus v_data pointer to get dereferenced
  164          * elsewhere if MALLOC should block.
  165          */
  166         np = malloc(sizeof *np, M_NWNODE, M_WAITOK | M_ZERO);
  167         error = getnewvnode("nwfs", mp, &nwfs_vnodeops, &vp);
  168         if (error) {
  169                 *vpp = NULL;
  170                 free(np, M_NWNODE);
  171                 return (error);
  172         }
  173         error = insmntque(vp, mp);      /* XXX: Too early for mpsafe fs */
  174         if (error != 0) {
  175                 free(np, M_NWNODE);
  176                 *vpp = NULL;
  177                 return (error);
  178         }
  179         vp->v_data = np;
  180         np->n_vnode = vp;
  181         np->n_mount = nmp;
  182         np->n_attr = fap->attributes;
  183         vp->v_type = np->n_attr & aDIR ? VDIR : VREG;
  184         np->n_fid = fid;
  185         if (dvp) {
  186                 np->n_parent = VTONW(dvp)->n_fid;
  187         }
  188         sx_xlock(&nwhashlock);
  189         /*
  190          * Another process can create vnode while we blocked in malloc() or
  191          * getnewvnode(). Rescan list again.
  192          */
  193         if (nwfs_hashlookup(nmp, fid, NULL) == 0) {
  194                 vp->v_data = NULL;
  195                 np->n_vnode = NULL;
  196                 vrele(vp);
  197                 free(np, M_NWNODE);
  198                 goto rescan;
  199         }
  200         *vpp = vp;
  201         nhpp = NWNOHASH(fid);
  202         LIST_INSERT_HEAD(nhpp, np, n_hash);
  203         vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
  204         VN_LOCK_AREC(vp);
  205         sx_xunlock(&nwhashlock);
  206         
  207         ASSERT_VOP_LOCKED(dvp, "nwfs_allocvp");
  208         if (vp->v_type == VDIR && dvp && (dvp->v_vflag & VV_ROOT) == 0) {
  209                 np->n_flag |= NREFPARENT;
  210                 vref(dvp);
  211         }
  212         return 0;
  213 }
  214 
  215 int
  216 nwfs_nget(struct mount *mp, ncpfid fid, struct nw_entry_info *fap,
  217           struct vnode *dvp, struct vnode **vpp)
  218 {
  219         struct vnode *vp;
  220         int error;
  221 
  222         *vpp = NULL;
  223         error = nwfs_allocvp(mp, fid, fap, dvp, &vp);
  224         if (error)
  225                 return error;
  226         if (fap)
  227                 nwfs_attr_cacheenter(vp, fap);
  228         *vpp = vp;
  229         return 0;
  230 }
  231 
  232 int
  233 nwfs_lookupnp(struct nwmount *nmp, ncpfid fid, struct thread *td,
  234         struct nwnode **npp)
  235 {
  236         int error;
  237 
  238         sx_xlock(&nwhashlock);
  239         error = nwfs_hashlookup(nmp, fid, npp);
  240         sx_xunlock(&nwhashlock);
  241         return error;
  242 }
  243 
  244 /*
  245  * Free nwnode, and give vnode back to system
  246  */
  247 int
  248 nwfs_reclaim(ap)                     
  249         struct vop_reclaim_args /* {
  250                 struct vnode *a_vp;
  251                 struct thread *a_td;
  252         } */ *ap;
  253 {
  254         struct vnode *dvp = NULL, *vp = ap->a_vp;
  255         struct nwnode *dnp, *np = VTONW(vp);
  256         struct nwmount *nmp = VTONWFS(vp);
  257         struct thread *td = ap->a_td;
  258         
  259         NCPVNDEBUG("%s,%d\n", np->n_name, vrefcnt(vp));
  260         /*
  261          * Destroy the vm object and flush associated pages.
  262          */
  263         vnode_destroy_vobject(vp);
  264 
  265         if (np->n_flag & NREFPARENT) {
  266                 np->n_flag &= ~NREFPARENT;
  267                 if (nwfs_lookupnp(nmp, np->n_parent, td, &dnp) == 0) {
  268                         dvp = dnp->n_vnode;
  269                 } else {
  270                         NCPVNDEBUG("%s: has no parent ?\n",np->n_name);
  271                 }
  272         }
  273         sx_xlock(&nwhashlock);
  274         LIST_REMOVE(np, n_hash);
  275         sx_xunlock(&nwhashlock);
  276         if (nmp->n_root == np) {
  277                 nmp->n_root = NULL;
  278         }
  279         vp->v_data = NULL;
  280         free(np, M_NWNODE);
  281         if (dvp) {
  282                 vrele(dvp);
  283         }
  284         return (0);
  285 }
  286 
  287 int
  288 nwfs_inactive(ap)
  289         struct vop_inactive_args /* {
  290                 struct vnode *a_vp;
  291                 struct thread *a_td;
  292         } */ *ap;
  293 {
  294         struct thread *td = ap->a_td;
  295         struct ucred *cred = td->td_ucred;
  296         struct vnode *vp = ap->a_vp;
  297         struct nwnode *np = VTONW(vp);
  298         int error;
  299 
  300         NCPVNDEBUG("%s: %d\n", VTONW(vp)->n_name, vrefcnt(vp));
  301         if (np->opened) {
  302                 error = nwfs_vinvalbuf(vp, td);
  303                 error = ncp_close_file(NWFSTOCONN(VTONWFS(vp)), &np->n_fh, td, cred);
  304                 np->opened = 0;
  305         }
  306         if (np->n_flag & NSHOULDFREE) {
  307                 cache_purge(vp);
  308                 vgone(vp);
  309         }
  310         return (0);
  311 }
  312 /*
  313  * routines to maintain vnode attributes cache
  314  * nwfs_attr_cacheenter: unpack np.i to va structure
  315  */
  316 void
  317 nwfs_attr_cacheenter(struct vnode *vp, struct nw_entry_info *fi)
  318 {
  319         struct nwnode *np = VTONW(vp);
  320         struct nwmount *nmp = VTONWFS(vp);
  321         struct vattr *va = &np->n_vattr;
  322 
  323         va->va_type = vp->v_type;               /* vnode type (for create) */
  324         np->n_nmlen = fi->nameLen;
  325         bcopy(fi->entryName, np->n_name, np->n_nmlen);
  326         np->n_name[fi->nameLen] = 0;
  327         if (vp->v_type == VREG) {
  328                 if (va->va_size != fi->dataStreamSize) {
  329                         va->va_size = fi->dataStreamSize;
  330                         vnode_pager_setsize(vp, va->va_size);
  331                 }
  332                 va->va_mode = nmp->m.file_mode; /* files access mode and type */
  333         } else if (vp->v_type == VDIR) {
  334                 va->va_size = 16384;            /* should be a better way ... */
  335                 va->va_mode = nmp->m.dir_mode;  /* files access mode and type */
  336         } else
  337                 return;
  338         np->n_size = va->va_size;
  339         va->va_nlink = 1;               /* number of references to file */
  340         va->va_uid = nmp->m.uid;        /* owner user id */
  341         va->va_gid = nmp->m.gid;        /* owner group id */
  342         va->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
  343         va->va_fileid = np->n_fid.f_id; /* file id */
  344         if (va->va_fileid == 0)
  345                 va->va_fileid = NWFS_ROOT_INO;
  346         va->va_blocksize=nmp->connh->nh_conn->buffer_size;/* blocksize preferred for i/o */
  347         /* time of last modification */
  348         ncp_dos2unixtime(fi->modifyDate, fi->modifyTime, 0, nmp->m.tz, &va->va_mtime);
  349         /* time of last access */
  350         ncp_dos2unixtime(fi->lastAccessDate, 0, 0, nmp->m.tz, &va->va_atime);
  351         va->va_ctime = va->va_mtime;    /* time file changed */
  352         va->va_gen = VNOVAL;            /* generation number of file */
  353         va->va_flags = 0;               /* flags defined for file */
  354         va->va_rdev = VNOVAL;           /* device the special file represents */
  355         va->va_bytes = va->va_size;     /* bytes of disk space held by file */
  356         va->va_filerev = 0;             /* file modification number */
  357         va->va_vaflags = 0;             /* operations flags */
  358         np->n_vattr = *va;
  359         if (np->n_mtime == 0) {
  360                 np->n_mtime = va->va_mtime.tv_sec;
  361         }
  362         np->n_atime = time_second;
  363         np->n_dosfid = fi->DosDirNum;
  364         return;
  365 }
  366 
  367 int
  368 nwfs_attr_cachelookup(struct vnode *vp, struct vattr *va)
  369 {
  370         struct nwnode *np = VTONW(vp);
  371         int diff;
  372 
  373         diff = time_second - np->n_atime;
  374         if (diff > 2) { /* XXX should be configurable */
  375                 return ENOENT;
  376         }
  377         *va = np->n_vattr;
  378         return 0;
  379 }

Cache object: 121686c55b9d58aba6719b0fa71d4825


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