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  * 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/8.0/sys/fs/nwfs/nwfs_node.c 184205 2008-10-23 15:53:51Z des $
   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/sx.h>
   44 #include <sys/sysctl.h>
   45 #include <sys/time.h>
   46 #include <sys/vnode.h>
   47 
   48 #include <vm/vm.h>
   49 #include <vm/vm_extern.h>
   50 #include <vm/vm_page.h>
   51 #include <vm/vm_object.h>
   52 
   53 #include <netncp/ncp.h>
   54 #include <netncp/ncp_conn.h>
   55 #include <netncp/ncp_subr.h>
   56 
   57 #include <fs/nwfs/nwfs.h>
   58 #include <fs/nwfs/nwfs_mount.h>
   59 #include <fs/nwfs/nwfs_node.h>
   60 #include <fs/nwfs/nwfs_subr.h>
   61 
   62 #define NWNOHASH(fhsum) (&nwhashtbl[(fhsum.f_id) & nwnodehash])
   63 
   64 static LIST_HEAD(nwnode_hash_head,nwnode) *nwhashtbl;
   65 static u_long nwnodehash;
   66 static struct sx nwhashlock;
   67 
   68 static MALLOC_DEFINE(M_NWNODE, "nwfs_node", "NWFS vnode private part");
   69 static MALLOC_DEFINE(M_NWFSHASH, "nwfs_hash", "NWFS has table");
   70 
   71 static int nwfs_sysctl_vnprint(SYSCTL_HANDLER_ARGS);
   72 
   73 SYSCTL_DECL(_vfs_nwfs);
   74 
   75 SYSCTL_PROC(_vfs_nwfs, OID_AUTO, vnprint, CTLFLAG_WR|CTLTYPE_OPAQUE,
   76             NULL, 0, nwfs_sysctl_vnprint, "S,vnlist", "vnode hash");
   77 
   78 void
   79 nwfs_hash_init(void) {
   80         nwhashtbl = hashinit(desiredvnodes, M_NWFSHASH, &nwnodehash);
   81         sx_init(&nwhashlock, "nwfshl");
   82 }
   83 
   84 void
   85 nwfs_hash_free(void) {
   86         sx_destroy(&nwhashlock);
   87         free(nwhashtbl, M_NWFSHASH);
   88 }
   89 
   90 int
   91 nwfs_sysctl_vnprint(SYSCTL_HANDLER_ARGS) {
   92         struct nwnode *np;
   93         struct nwnode_hash_head *nhpp;
   94         struct vnode *vp;
   95         int i;
   96 
   97         if (nwfs_debuglevel == 0)
   98                 return 0;
   99         printf("Name:uc:hc:fid:pfid\n");
  100         for(i = 0; i <= nwnodehash; i++) {
  101                 nhpp = &nwhashtbl[i];
  102                 LIST_FOREACH(np, nhpp, n_hash) {
  103                         vp = NWTOV(np);
  104                         vprint("", vp);
  105                         printf("%s:%d:%d:%d:%d\n",np->n_name,vrefcnt(vp),
  106                             vp->v_holdcnt,np->n_fid.f_id, np->n_fid.f_parent);
  107                 }
  108         }
  109         return 0;
  110 }
  111 
  112 /*
  113  * Search nwnode with given fid.
  114  * Hash list should be locked by caller.
  115  */
  116 static int
  117 nwfs_hashlookup(struct nwmount *nmp, ncpfid fid, struct nwnode **npp)
  118 {
  119         struct nwnode *np;
  120         struct nwnode_hash_head *nhpp;
  121 
  122         sx_assert(&nwhashlock, SA_XLOCKED);
  123 
  124         nhpp = NWNOHASH(fid);
  125         LIST_FOREACH(np, nhpp, n_hash) {
  126                 if (nmp != np->n_mount || !NWCMPF(&fid, &np->n_fid))
  127                         continue;
  128                 if (npp)
  129                         *npp = np;
  130                 return 0;
  131         }
  132         return ENOENT;
  133 }
  134 
  135 /*
  136  * Allocate new nwfsnode/vnode from given nwnode. 
  137  * Vnode referenced and not locked.
  138  */
  139 static int
  140 nwfs_allocvp(struct mount *mp, ncpfid fid, struct nw_entry_info *fap,
  141         struct vnode *dvp, struct vnode **vpp)
  142 {
  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         sx_xlock(&nwhashlock);
  151 rescan:
  152         if (nwfs_hashlookup(nmp, fid, &np) == 0) {
  153                 vp = NWTOV(np);
  154                 mtx_lock(&vp->v_interlock);
  155                 sx_xunlock(&nwhashlock);
  156                 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, curthread))
  157                         goto loop;
  158                 if (fap)
  159                         np->n_attr = fap->attributes;
  160                 *vpp = vp;
  161                 return(0);
  162         }
  163         sx_xunlock(&nwhashlock);
  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         np = malloc(sizeof *np, M_NWNODE, M_WAITOK | M_ZERO);
  173         error = getnewvnode("nwfs", mp, &nwfs_vnodeops, &vp);
  174         if (error) {
  175                 *vpp = NULL;
  176                 free(np, M_NWNODE);
  177                 return (error);
  178         }
  179         error = insmntque(vp, mp);      /* XXX: Too early for mpsafe fs */
  180         if (error != 0) {
  181                 free(np, M_NWNODE);
  182                 *vpp = NULL;
  183                 return (error);
  184         }
  185         vp->v_data = np;
  186         np->n_vnode = vp;
  187         np->n_mount = nmp;
  188         np->n_attr = fap->attributes;
  189         vp->v_type = np->n_attr & aDIR ? VDIR : VREG;
  190         np->n_fid = fid;
  191         if (dvp) {
  192                 np->n_parent = VTONW(dvp)->n_fid;
  193         }
  194         VN_LOCK_AREC(vp);
  195         sx_xlock(&nwhashlock);
  196         /*
  197          * Another process can create vnode while we blocked in malloc() or
  198          * getnewvnode(). Rescan list again.
  199          */
  200         if (nwfs_hashlookup(nmp, fid, NULL) == 0) {
  201                 vp->v_data = NULL;
  202                 np->n_vnode = NULL;
  203                 vrele(vp);
  204                 free(np, M_NWNODE);
  205                 goto rescan;
  206         }
  207         *vpp = vp;
  208         nhpp = NWNOHASH(fid);
  209         LIST_INSERT_HEAD(nhpp, np, n_hash);
  210         vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
  211         sx_xunlock(&nwhashlock);
  212         
  213         ASSERT_VOP_LOCKED(dvp, "nwfs_allocvp");
  214         if (vp->v_type == VDIR && dvp && (dvp->v_vflag & VV_ROOT) == 0) {
  215                 np->n_flag |= NREFPARENT;
  216                 vref(dvp);
  217         }
  218         return 0;
  219 }
  220 
  221 int
  222 nwfs_nget(struct mount *mp, ncpfid fid, struct nw_entry_info *fap,
  223           struct vnode *dvp, struct vnode **vpp)
  224 {
  225         struct vnode *vp;
  226         int error;
  227 
  228         *vpp = NULL;
  229         error = nwfs_allocvp(mp, fid, fap, dvp, &vp);
  230         if (error)
  231                 return error;
  232         if (fap)
  233                 nwfs_attr_cacheenter(vp, fap);
  234         *vpp = vp;
  235         return 0;
  236 }
  237 
  238 int
  239 nwfs_lookupnp(struct nwmount *nmp, ncpfid fid, struct thread *td,
  240         struct nwnode **npp)
  241 {
  242         int error;
  243 
  244         sx_xlock(&nwhashlock);
  245         error = nwfs_hashlookup(nmp, fid, npp);
  246         sx_xunlock(&nwhashlock);
  247         return error;
  248 }
  249 
  250 /*
  251  * Free nwnode, and give vnode back to system
  252  */
  253 int
  254 nwfs_reclaim(ap)                     
  255         struct vop_reclaim_args /* {
  256                 struct vnode *a_vp;
  257                 struct thread *a_td;
  258         } */ *ap;
  259 {
  260         struct vnode *dvp = NULL, *vp = ap->a_vp;
  261         struct nwnode *dnp, *np = VTONW(vp);
  262         struct nwmount *nmp = VTONWFS(vp);
  263         struct thread *td = ap->a_td;
  264         
  265         NCPVNDEBUG("%s,%d\n", np->n_name, vrefcnt(vp));
  266         /*
  267          * Destroy the vm object and flush associated pages.
  268          */
  269         vnode_destroy_vobject(vp);
  270 
  271         if (np->n_flag & NREFPARENT) {
  272                 np->n_flag &= ~NREFPARENT;
  273                 if (nwfs_lookupnp(nmp, np->n_parent, td, &dnp) == 0) {
  274                         dvp = dnp->n_vnode;
  275                 } else {
  276                         NCPVNDEBUG("%s: has no parent ?\n",np->n_name);
  277                 }
  278         }
  279         sx_xlock(&nwhashlock);
  280         LIST_REMOVE(np, n_hash);
  281         sx_xunlock(&nwhashlock);
  282         if (nmp->n_root == np) {
  283                 nmp->n_root = NULL;
  284         }
  285         vp->v_data = NULL;
  286         free(np, M_NWNODE);
  287         if (dvp) {
  288                 vrele(dvp);
  289         }
  290         return (0);
  291 }
  292 
  293 int
  294 nwfs_inactive(ap)
  295         struct vop_inactive_args /* {
  296                 struct vnode *a_vp;
  297                 struct thread *a_td;
  298         } */ *ap;
  299 {
  300         struct thread *td = ap->a_td;
  301         struct ucred *cred = td->td_ucred;
  302         struct vnode *vp = ap->a_vp;
  303         struct nwnode *np = VTONW(vp);
  304         int error;
  305 
  306         NCPVNDEBUG("%s: %d\n", VTONW(vp)->n_name, vrefcnt(vp));
  307         if (np->opened) {
  308                 error = nwfs_vinvalbuf(vp, td);
  309                 error = ncp_close_file(NWFSTOCONN(VTONWFS(vp)), &np->n_fh, td, cred);
  310                 np->opened = 0;
  311         }
  312         if (np->n_flag & NSHOULDFREE) {
  313                 cache_purge(vp);
  314                 vgone(vp);
  315         }
  316         return (0);
  317 }
  318 /*
  319  * routines to maintain vnode attributes cache
  320  * nwfs_attr_cacheenter: unpack np.i to va structure
  321  */
  322 void
  323 nwfs_attr_cacheenter(struct vnode *vp, struct nw_entry_info *fi)
  324 {
  325         struct nwnode *np = VTONW(vp);
  326         struct nwmount *nmp = VTONWFS(vp);
  327         struct vattr *va = &np->n_vattr;
  328 
  329         va->va_type = vp->v_type;               /* vnode type (for create) */
  330         np->n_nmlen = fi->nameLen;
  331         bcopy(fi->entryName, np->n_name, np->n_nmlen);
  332         np->n_name[fi->nameLen] = 0;
  333         if (vp->v_type == VREG) {
  334                 if (va->va_size != fi->dataStreamSize) {
  335                         va->va_size = fi->dataStreamSize;
  336                         vnode_pager_setsize(vp, va->va_size);
  337                 }
  338                 va->va_mode = nmp->m.file_mode; /* files access mode and type */
  339         } else if (vp->v_type == VDIR) {
  340                 va->va_size = 16384;            /* should be a better way ... */
  341                 va->va_mode = nmp->m.dir_mode;  /* files access mode and type */
  342         } else
  343                 return;
  344         np->n_size = va->va_size;
  345         va->va_nlink = 1;               /* number of references to file */
  346         va->va_uid = nmp->m.uid;        /* owner user id */
  347         va->va_gid = nmp->m.gid;        /* owner group id */
  348         va->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
  349         va->va_fileid = np->n_fid.f_id; /* file id */
  350         if (va->va_fileid == 0)
  351                 va->va_fileid = NWFS_ROOT_INO;
  352         va->va_blocksize=nmp->connh->nh_conn->buffer_size;/* blocksize preferred for i/o */
  353         /* time of last modification */
  354         ncp_dos2unixtime(fi->modifyDate, fi->modifyTime, 0, nmp->m.tz, &va->va_mtime);
  355         /* time of last access */
  356         ncp_dos2unixtime(fi->lastAccessDate, 0, 0, nmp->m.tz, &va->va_atime);
  357         va->va_ctime = va->va_mtime;    /* time file changed */
  358         va->va_gen = VNOVAL;            /* generation number of file */
  359         va->va_flags = 0;               /* flags defined for file */
  360         va->va_rdev = VNOVAL;           /* device the special file represents */
  361         va->va_bytes = va->va_size;     /* bytes of disk space held by file */
  362         va->va_filerev = 0;             /* file modification number */
  363         va->va_vaflags = 0;             /* operations flags */
  364         np->n_vattr = *va;
  365         if (np->n_mtime == 0) {
  366                 np->n_mtime = va->va_mtime.tv_sec;
  367         }
  368         np->n_atime = time_second;
  369         np->n_dosfid = fi->DosDirNum;
  370         return;
  371 }
  372 
  373 int
  374 nwfs_attr_cachelookup(struct vnode *vp, struct vattr *va)
  375 {
  376         struct nwnode *np = VTONW(vp);
  377         int diff;
  378 
  379         diff = time_second - np->n_atime;
  380         if (diff > 2) { /* XXX should be configurable */
  381                 return ENOENT;
  382         }
  383         *va = np->n_vattr;
  384         return 0;
  385 }

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