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  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *    This product includes software developed by Boris Popov.
   16  * 4. Neither the name of the author nor the names of any co-contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  * $FreeBSD: releng/5.0/sys/fs/nwfs/nwfs_node.c 105077 2002-10-14 03:20:36Z mckusick $
   33  */
   34 #include <sys/param.h>
   35 #include <sys/systm.h>
   36 #include <sys/kernel.h>
   37 #include <sys/lock.h>
   38 #include <sys/malloc.h>
   39 #include <sys/mount.h>
   40 #include <sys/mutex.h>
   41 #include <sys/proc.h>
   42 #include <sys/queue.h>
   43 #include <sys/sysctl.h>
   44 #include <sys/time.h>
   45 #include <sys/vnode.h>
   46 
   47 #include <vm/vm.h>
   48 #include <vm/vm_extern.h>
   49 #include <vm/vm_page.h>
   50 #include <vm/vm_object.h>
   51 
   52 #include <netncp/ncp.h>
   53 #include <netncp/ncp_conn.h>
   54 #include <netncp/ncp_subr.h>
   55 
   56 #include <fs/nwfs/nwfs.h>
   57 #include <fs/nwfs/nwfs_mount.h>
   58 #include <fs/nwfs/nwfs_node.h>
   59 #include <fs/nwfs/nwfs_subr.h>
   60 
   61 #define NWNOHASH(fhsum) (&nwhashtbl[(fhsum.f_id) & nwnodehash])
   62 
   63 extern vop_t **nwfs_vnodeop_p;
   64 
   65 static LIST_HEAD(nwnode_hash_head,nwnode) *nwhashtbl;
   66 static u_long nwnodehash;
   67 static struct lock nwhashlock;
   68 
   69 MALLOC_DEFINE(M_NWNODE, "NWFS node", "NWFS vnode private part");
   70 MALLOC_DEFINE(M_NWFSHASH, "NWFS hash", "NWFS has table");
   71 
   72 static int nwfs_sysctl_vnprint(SYSCTL_HANDLER_ARGS);
   73 
   74 SYSCTL_DECL(_vfs_nwfs);
   75 
   76 SYSCTL_PROC(_vfs_nwfs, OID_AUTO, vnprint, CTLFLAG_WR|CTLTYPE_OPAQUE,
   77             NULL, 0, nwfs_sysctl_vnprint, "S,vnlist", "vnode hash");
   78 
   79 void
   80 nwfs_hash_init(void) {
   81         nwhashtbl = hashinit(desiredvnodes, M_NWFSHASH, &nwnodehash);
   82         lockinit(&nwhashlock, PVFS, "nwfshl", 0, 0);
   83 }
   84 
   85 void
   86 nwfs_hash_free(void) {
   87         lockdestroy(&nwhashlock);
   88         free(nwhashtbl, M_NWFSHASH);
   89 }
   90 
   91 int
   92 nwfs_sysctl_vnprint(SYSCTL_HANDLER_ARGS) {
   93         struct nwnode *np;
   94         struct nwnode_hash_head *nhpp;
   95         struct vnode *vp;
   96         int i;
   97 
   98         if (nwfs_debuglevel == 0)
   99                 return 0;
  100         printf("Name:uc:hc:fid:pfid\n");
  101         for(i = 0; i <= nwnodehash; i++) {
  102                 nhpp = &nwhashtbl[i];
  103                 LIST_FOREACH(np, nhpp, n_hash) {
  104                         vp = NWTOV(np);
  105                         vprint(NULL, vp);
  106                         printf("%s:%d:%d:%d:%d\n",np->n_name,vrefcnt(vp),
  107                             vp->v_holdcnt,np->n_fid.f_id, np->n_fid.f_parent);
  108                 }
  109         }
  110         return 0;
  111 }
  112 
  113 /*
  114  * Search nwnode with given fid.
  115  * Hash list should be locked by caller.
  116  */
  117 static int
  118 nwfs_hashlookup(struct nwmount *nmp, ncpfid fid, struct nwnode **npp)
  119 {
  120         struct nwnode *np;
  121         struct nwnode_hash_head *nhpp;
  122 
  123         nhpp = NWNOHASH(fid);
  124         LIST_FOREACH(np, nhpp, n_hash) {
  125                 if (nmp != np->n_mount || !NWCMPF(&fid, &np->n_fid))
  126                         continue;
  127                 if (npp)
  128                         *npp = np;
  129                 return 0;
  130         }
  131         return ENOENT;
  132 }
  133 
  134 /*
  135  * Allocate new nwfsnode/vnode from given nwnode. 
  136  * Vnode referenced and not locked.
  137  */
  138 static int
  139 nwfs_allocvp(struct mount *mp, ncpfid fid, struct nw_entry_info *fap,
  140         struct vnode *dvp, struct vnode **vpp)
  141 {
  142         struct thread *td = curthread;  /* XXX */
  143         struct nwnode *np;
  144         struct nwnode_hash_head *nhpp;
  145         struct nwmount *nmp = VFSTONWFS(mp);
  146         struct vnode *vp;
  147         int error;
  148 
  149 loop:
  150         lockmgr(&nwhashlock, LK_EXCLUSIVE, NULL, td);
  151 rescan:
  152         if (nwfs_hashlookup(nmp, fid, &np) == 0) {
  153                 vp = NWTOV(np);
  154                 mtx_lock(&vp->v_interlock);
  155                 lockmgr(&nwhashlock, LK_RELEASE, NULL, td);
  156                 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td))
  157                         goto loop;
  158                 if (fap)
  159                         np->n_attr = fap->attributes;
  160                 *vpp = vp;
  161                 return(0);
  162         }
  163         lockmgr(&nwhashlock, LK_RELEASE, NULL, td);
  164 
  165         if (fap == NULL || ((fap->attributes & aDIR) == 0 && dvp == NULL))
  166                 panic("nwfs_allocvp: fap = %p, dvp = %p\n", fap, dvp);
  167         /*
  168          * Do the MALLOC before the getnewvnode since doing so afterward
  169          * might cause a bogus v_data pointer to get dereferenced
  170          * elsewhere if MALLOC should block.
  171          */
  172         MALLOC(np, struct nwnode *, sizeof *np, M_NWNODE, M_WAITOK | M_ZERO);
  173         error = getnewvnode("nwfs", mp, nwfs_vnodeop_p, &vp);
  174         if (error) {
  175                 *vpp = NULL;
  176                 FREE(np, M_NWNODE);
  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         vp->v_vnlock->lk_flags |= LK_CANRECURSE;
  189         lockmgr(&nwhashlock, LK_EXCLUSIVE, NULL, td);
  190         /*
  191          * Another process can create vnode while we blocked in malloc() or
  192          * getnewvnode(). Rescan list again.
  193          */
  194         if (nwfs_hashlookup(nmp, fid, NULL) == 0) {
  195                 vp->v_data = NULL;
  196                 np->n_vnode = NULL;
  197                 vrele(vp);
  198                 FREE(np, M_NWNODE);
  199                 goto rescan;
  200         }
  201         *vpp = vp;
  202         nhpp = NWNOHASH(fid);
  203         LIST_INSERT_HEAD(nhpp, np, n_hash);
  204         vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
  205         lockmgr(&nwhashlock, LK_RELEASE, NULL, td);
  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         lockmgr(&nwhashlock, LK_EXCLUSIVE, NULL, td);
  239         error = nwfs_hashlookup(nmp, fid, npp);
  240         lockmgr(&nwhashlock, LK_RELEASE, NULL, td);
  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         if (np->n_flag & NREFPARENT) {
  261                 np->n_flag &= ~NREFPARENT;
  262                 if (nwfs_lookupnp(nmp, np->n_parent, td, &dnp) == 0) {
  263                         dvp = dnp->n_vnode;
  264                 } else {
  265                         NCPVNDEBUG("%s: has no parent ?\n",np->n_name);
  266                 }
  267         }
  268         lockmgr(&nwhashlock, LK_EXCLUSIVE, NULL, td);
  269         LIST_REMOVE(np, n_hash);
  270         lockmgr(&nwhashlock, LK_RELEASE, NULL, td);
  271         cache_purge(vp);
  272         if (nmp->n_root == np) {
  273                 nmp->n_root = NULL;
  274         }
  275         vp->v_data = NULL;
  276         FREE(np, M_NWNODE);
  277         if (dvp) {
  278                 vrele(dvp);
  279         }
  280         return (0);
  281 }
  282 
  283 int
  284 nwfs_inactive(ap)
  285         struct vop_inactive_args /* {
  286                 struct vnode *a_vp;
  287                 struct thread *a_td;
  288         } */ *ap;
  289 {
  290         struct thread *td = ap->a_td;
  291         struct ucred *cred = td->td_ucred;
  292         struct vnode *vp = ap->a_vp;
  293         struct nwnode *np = VTONW(vp);
  294         int error;
  295 
  296         NCPVNDEBUG("%s: %d\n", VTONW(vp)->n_name, vrefcnt(vp));
  297         if (np->opened) {
  298                 error = nwfs_vinvalbuf(vp, V_SAVE, cred, td, 1);
  299                 error = ncp_close_file(NWFSTOCONN(VTONWFS(vp)), &np->n_fh, td, cred);
  300                 np->opened = 0;
  301         }
  302         VOP_UNLOCK(vp, 0, td);
  303         if (np->n_flag & NSHOULDFREE) {
  304                 cache_purge(vp);
  305                 vgone(vp);
  306         }
  307         return (0);
  308 }
  309 /*
  310  * routines to maintain vnode attributes cache
  311  * nwfs_attr_cacheenter: unpack np.i to va structure
  312  */
  313 void
  314 nwfs_attr_cacheenter(struct vnode *vp, struct nw_entry_info *fi)
  315 {
  316         struct nwnode *np = VTONW(vp);
  317         struct nwmount *nmp = VTONWFS(vp);
  318         struct vattr *va = &np->n_vattr;
  319 
  320         va->va_type = vp->v_type;               /* vnode type (for create) */
  321         np->n_nmlen = fi->nameLen;
  322         bcopy(fi->entryName, np->n_name, np->n_nmlen);
  323         np->n_name[fi->nameLen] = 0;
  324         if (vp->v_type == VREG) {
  325                 if (va->va_size != fi->dataStreamSize) {
  326                         va->va_size = fi->dataStreamSize;
  327                         vnode_pager_setsize(vp, va->va_size);
  328                 }
  329                 va->va_mode = nmp->m.file_mode; /* files access mode and type */
  330         } else if (vp->v_type == VDIR) {
  331                 va->va_size = 16384;            /* should be a better way ... */
  332                 va->va_mode = nmp->m.dir_mode;  /* files access mode and type */
  333         } else
  334                 return;
  335         np->n_size = va->va_size;
  336         va->va_nlink = 1;               /* number of references to file */
  337         va->va_uid = nmp->m.uid;        /* owner user id */
  338         va->va_gid = nmp->m.gid;        /* owner group id */
  339         va->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
  340         va->va_fileid = np->n_fid.f_id; /* file id */
  341         if (va->va_fileid == 0)
  342                 va->va_fileid = NWFS_ROOT_INO;
  343         va->va_blocksize=nmp->connh->nh_conn->buffer_size;/* blocksize preferred for i/o */
  344         /* time of last modification */
  345         ncp_dos2unixtime(fi->modifyDate, fi->modifyTime, 0, nmp->m.tz, &va->va_mtime);
  346         /* time of last access */
  347         ncp_dos2unixtime(fi->lastAccessDate, 0, 0, nmp->m.tz, &va->va_atime);
  348         va->va_ctime = va->va_mtime;    /* time file changed */
  349         va->va_gen = VNOVAL;            /* generation number of file */
  350         va->va_flags = 0;               /* flags defined for file */
  351         va->va_rdev = VNOVAL;           /* device the special file represents */
  352         va->va_bytes = va->va_size;     /* bytes of disk space held by file */
  353         va->va_filerev = 0;             /* file modification number */
  354         va->va_vaflags = 0;             /* operations flags */
  355         np->n_vattr = *va;
  356         if (np->n_mtime == 0) {
  357                 np->n_mtime = va->va_mtime.tv_sec;
  358         }
  359         np->n_atime = time_second;
  360         np->n_dosfid = fi->DosDirNum;
  361         return;
  362 }
  363 
  364 int
  365 nwfs_attr_cachelookup(struct vnode *vp, struct vattr *va)
  366 {
  367         struct nwnode *np = VTONW(vp);
  368         int diff;
  369 
  370         diff = time_second - np->n_atime;
  371         if (diff > 2) { /* XXX should be configurable */
  372                 return ENOENT;
  373         }
  374         *va = np->n_vattr;
  375         return 0;
  376 }
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FreeBSD/Linux Kernel Cross Reference sys/fs/nwfs/nwfs_node.c

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