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  * $FreeBSD$
   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 static LIST_HEAD(nwnode_hash_head,nwnode) *nwhashtbl;
   64 static u_long nwnodehash;
   65 static struct lock nwhashlock;
   66 
   67 static MALLOC_DEFINE(M_NWNODE, "NWFS node", "NWFS vnode private part");
   68 static MALLOC_DEFINE(M_NWFSHASH, "NWFS hash", "NWFS has table");
   69 
   70 static int nwfs_sysctl_vnprint(SYSCTL_HANDLER_ARGS);
   71 
   72 SYSCTL_DECL(_vfs_nwfs);
   73 
   74 SYSCTL_PROC(_vfs_nwfs, OID_AUTO, vnprint, CTLFLAG_WR|CTLTYPE_OPAQUE,
   75             NULL, 0, nwfs_sysctl_vnprint, "S,vnlist", "vnode hash");
   76 
   77 void
   78 nwfs_hash_init(void) {
   79         nwhashtbl = hashinit(desiredvnodes, M_NWFSHASH, &nwnodehash);
   80         lockinit(&nwhashlock, PVFS, "nwfshl", 0, 0);
   81 }
   82 
   83 void
   84 nwfs_hash_free(void) {
   85         lockdestroy(&nwhashlock);
   86         free(nwhashtbl, M_NWFSHASH);
   87 }
   88 
   89 int
   90 nwfs_sysctl_vnprint(SYSCTL_HANDLER_ARGS) {
   91         struct nwnode *np;
   92         struct nwnode_hash_head *nhpp;
   93         struct vnode *vp;
   94         int i;
   95 
   96         if (nwfs_debuglevel == 0)
   97                 return 0;
   98         printf("Name:uc:hc:fid:pfid\n");
   99         for(i = 0; i <= nwnodehash; i++) {
  100                 nhpp = &nwhashtbl[i];
  101                 LIST_FOREACH(np, nhpp, n_hash) {
  102                         vp = NWTOV(np);
  103                         vprint("", vp);
  104                         printf("%s:%d:%d:%d:%d\n",np->n_name,vrefcnt(vp),
  105                             vp->v_holdcnt,np->n_fid.f_id, np->n_fid.f_parent);
  106                 }
  107         }
  108         return 0;
  109 }
  110 
  111 /*
  112  * Search nwnode with given fid.
  113  * Hash list should be locked by caller.
  114  */
  115 static int
  116 nwfs_hashlookup(struct nwmount *nmp, ncpfid fid, struct nwnode **npp)
  117 {
  118         struct nwnode *np;
  119         struct nwnode_hash_head *nhpp;
  120 
  121         nhpp = NWNOHASH(fid);
  122         LIST_FOREACH(np, nhpp, n_hash) {
  123                 if (nmp != np->n_mount || !NWCMPF(&fid, &np->n_fid))
  124                         continue;
  125                 if (npp)
  126                         *npp = np;
  127                 return 0;
  128         }
  129         return ENOENT;
  130 }
  131 
  132 /*
  133  * Allocate new nwfsnode/vnode from given nwnode. 
  134  * Vnode referenced and not locked.
  135  */
  136 static int
  137 nwfs_allocvp(struct mount *mp, ncpfid fid, struct nw_entry_info *fap,
  138         struct vnode *dvp, struct vnode **vpp)
  139 {
  140         struct thread *td = curthread;  /* XXX */
  141         struct nwnode *np;
  142         struct nwnode_hash_head *nhpp;
  143         struct nwmount *nmp = VFSTONWFS(mp);
  144         struct vnode *vp;
  145         int error;
  146 
  147 loop:
  148         lockmgr(&nwhashlock, LK_EXCLUSIVE, NULL, td);
  149 rescan:
  150         if (nwfs_hashlookup(nmp, fid, &np) == 0) {
  151                 vp = NWTOV(np);
  152                 mtx_lock(&vp->v_interlock);
  153                 lockmgr(&nwhashlock, LK_RELEASE, NULL, td);
  154                 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td))
  155                         goto loop;
  156                 if (fap)
  157                         np->n_attr = fap->attributes;
  158                 *vpp = vp;
  159                 return(0);
  160         }
  161         lockmgr(&nwhashlock, LK_RELEASE, NULL, td);
  162 
  163         if (fap == NULL || ((fap->attributes & aDIR) == 0 && dvp == NULL))
  164                 panic("nwfs_allocvp: fap = %p, dvp = %p\n", fap, dvp);
  165         /*
  166          * Do the MALLOC before the getnewvnode since doing so afterward
  167          * might cause a bogus v_data pointer to get dereferenced
  168          * elsewhere if MALLOC should block.
  169          */
  170         MALLOC(np, struct nwnode *, sizeof *np, M_NWNODE, M_WAITOK | M_ZERO);
  171         error = getnewvnode("nwfs", mp, &nwfs_vnodeops, &vp);
  172         if (error) {
  173                 *vpp = NULL;
  174                 FREE(np, M_NWNODE);
  175                 return (error);
  176         }
  177         vp->v_data = np;
  178         np->n_vnode = vp;
  179         np->n_mount = nmp;
  180         np->n_attr = fap->attributes;
  181         vp->v_type = np->n_attr & aDIR ? VDIR : VREG;
  182         np->n_fid = fid;
  183         if (dvp) {
  184                 np->n_parent = VTONW(dvp)->n_fid;
  185         }
  186         vp->v_vnlock->lk_flags |= LK_CANRECURSE;
  187         lockmgr(&nwhashlock, LK_EXCLUSIVE, NULL, td);
  188         /*
  189          * Another process can create vnode while we blocked in malloc() or
  190          * getnewvnode(). Rescan list again.
  191          */
  192         if (nwfs_hashlookup(nmp, fid, NULL) == 0) {
  193                 vp->v_data = NULL;
  194                 np->n_vnode = NULL;
  195                 vrele(vp);
  196                 FREE(np, M_NWNODE);
  197                 goto rescan;
  198         }
  199         *vpp = vp;
  200         nhpp = NWNOHASH(fid);
  201         LIST_INSERT_HEAD(nhpp, np, n_hash);
  202         vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
  203         lockmgr(&nwhashlock, LK_RELEASE, NULL, td);
  204         
  205         ASSERT_VOP_LOCKED(dvp, "nwfs_allocvp");
  206         if (vp->v_type == VDIR && dvp && (dvp->v_vflag & VV_ROOT) == 0) {
  207                 np->n_flag |= NREFPARENT;
  208                 vref(dvp);
  209         }
  210         return 0;
  211 }
  212 
  213 int
  214 nwfs_nget(struct mount *mp, ncpfid fid, struct nw_entry_info *fap,
  215           struct vnode *dvp, struct vnode **vpp)
  216 {
  217         struct vnode *vp;
  218         int error;
  219 
  220         *vpp = NULL;
  221         error = nwfs_allocvp(mp, fid, fap, dvp, &vp);
  222         if (error)
  223                 return error;
  224         if (fap)
  225                 nwfs_attr_cacheenter(vp, fap);
  226         *vpp = vp;
  227         return 0;
  228 }
  229 
  230 int
  231 nwfs_lookupnp(struct nwmount *nmp, ncpfid fid, struct thread *td,
  232         struct nwnode **npp)
  233 {
  234         int error;
  235 
  236         lockmgr(&nwhashlock, LK_EXCLUSIVE, NULL, td);
  237         error = nwfs_hashlookup(nmp, fid, npp);
  238         lockmgr(&nwhashlock, LK_RELEASE, NULL, td);
  239         return error;
  240 }
  241 
  242 /*
  243  * Free nwnode, and give vnode back to system
  244  */
  245 int
  246 nwfs_reclaim(ap)                     
  247         struct vop_reclaim_args /* {
  248                 struct vnode *a_vp;
  249                 struct thread *a_td;
  250         } */ *ap;
  251 {
  252         struct vnode *dvp = NULL, *vp = ap->a_vp;
  253         struct nwnode *dnp, *np = VTONW(vp);
  254         struct nwmount *nmp = VTONWFS(vp);
  255         struct thread *td = ap->a_td;
  256         
  257         NCPVNDEBUG("%s,%d\n", np->n_name, vrefcnt(vp));
  258         /*
  259          * Destroy the vm object and flush associated pages.
  260          */
  261         vnode_destroy_vobject(vp);
  262 
  263         if (np->n_flag & NREFPARENT) {
  264                 np->n_flag &= ~NREFPARENT;
  265                 if (nwfs_lookupnp(nmp, np->n_parent, td, &dnp) == 0) {
  266                         dvp = dnp->n_vnode;
  267                 } else {
  268                         NCPVNDEBUG("%s: has no parent ?\n",np->n_name);
  269                 }
  270         }
  271         lockmgr(&nwhashlock, LK_EXCLUSIVE, NULL, td);
  272         LIST_REMOVE(np, n_hash);
  273         lockmgr(&nwhashlock, LK_RELEASE, NULL, td);
  274         if (nmp->n_root == np) {
  275                 nmp->n_root = NULL;
  276         }
  277         vp->v_data = NULL;
  278         FREE(np, M_NWNODE);
  279         if (dvp) {
  280                 vrele(dvp);
  281         }
  282         return (0);
  283 }
  284 
  285 int
  286 nwfs_inactive(ap)
  287         struct vop_inactive_args /* {
  288                 struct vnode *a_vp;
  289                 struct thread *a_td;
  290         } */ *ap;
  291 {
  292         struct thread *td = ap->a_td;
  293         struct ucred *cred = td->td_ucred;
  294         struct vnode *vp = ap->a_vp;
  295         struct nwnode *np = VTONW(vp);
  296         int error;
  297 
  298         NCPVNDEBUG("%s: %d\n", VTONW(vp)->n_name, vrefcnt(vp));
  299         if (np->opened) {
  300                 error = nwfs_vinvalbuf(vp, td);
  301                 error = ncp_close_file(NWFSTOCONN(VTONWFS(vp)), &np->n_fh, td, cred);
  302                 np->opened = 0;
  303         }
  304         if (np->n_flag & NSHOULDFREE) {
  305                 cache_purge(vp);
  306                 vgone(vp);
  307         }
  308         return (0);
  309 }
  310 /*
  311  * routines to maintain vnode attributes cache
  312  * nwfs_attr_cacheenter: unpack np.i to va structure
  313  */
  314 void
  315 nwfs_attr_cacheenter(struct vnode *vp, struct nw_entry_info *fi)
  316 {
  317         struct nwnode *np = VTONW(vp);
  318         struct nwmount *nmp = VTONWFS(vp);
  319         struct vattr *va = &np->n_vattr;
  320 
  321         va->va_type = vp->v_type;               /* vnode type (for create) */
  322         np->n_nmlen = fi->nameLen;
  323         bcopy(fi->entryName, np->n_name, np->n_nmlen);
  324         np->n_name[fi->nameLen] = 0;
  325         if (vp->v_type == VREG) {
  326                 if (va->va_size != fi->dataStreamSize) {
  327                         va->va_size = fi->dataStreamSize;
  328                         vnode_pager_setsize(vp, va->va_size);
  329                 }
  330                 va->va_mode = nmp->m.file_mode; /* files access mode and type */
  331         } else if (vp->v_type == VDIR) {
  332                 va->va_size = 16384;            /* should be a better way ... */
  333                 va->va_mode = nmp->m.dir_mode;  /* files access mode and type */
  334         } else
  335                 return;
  336         np->n_size = va->va_size;
  337         va->va_nlink = 1;               /* number of references to file */
  338         va->va_uid = nmp->m.uid;        /* owner user id */
  339         va->va_gid = nmp->m.gid;        /* owner group id */
  340         va->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
  341         va->va_fileid = np->n_fid.f_id; /* file id */
  342         if (va->va_fileid == 0)
  343                 va->va_fileid = NWFS_ROOT_INO;
  344         va->va_blocksize=nmp->connh->nh_conn->buffer_size;/* blocksize preferred for i/o */
  345         /* time of last modification */
  346         ncp_dos2unixtime(fi->modifyDate, fi->modifyTime, 0, nmp->m.tz, &va->va_mtime);
  347         /* time of last access */
  348         ncp_dos2unixtime(fi->lastAccessDate, 0, 0, nmp->m.tz, &va->va_atime);
  349         va->va_ctime = va->va_mtime;    /* time file changed */
  350         va->va_gen = VNOVAL;            /* generation number of file */
  351         va->va_flags = 0;               /* flags defined for file */
  352         va->va_rdev = VNOVAL;           /* device the special file represents */
  353         va->va_bytes = va->va_size;     /* bytes of disk space held by file */
  354         va->va_filerev = 0;             /* file modification number */
  355         va->va_vaflags = 0;             /* operations flags */
  356         np->n_vattr = *va;
  357         if (np->n_mtime == 0) {
  358                 np->n_mtime = va->va_mtime.tv_sec;
  359         }
  360         np->n_atime = time_second;
  361         np->n_dosfid = fi->DosDirNum;
  362         return;
  363 }
  364 
  365 int
  366 nwfs_attr_cachelookup(struct vnode *vp, struct vattr *va)
  367 {
  368         struct nwnode *np = VTONW(vp);
  369         int diff;
  370 
  371         diff = time_second - np->n_atime;
  372         if (diff > 2) { /* XXX should be configurable */
  373                 return ENOENT;
  374         }
  375         *va = np->n_vattr;
  376         return 0;
  377 }
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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
