sys/vfs/nwfs/nwfs_node.c

   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: src/sys/nwfs/nwfs_node.c,v 1.3.2.8 2001/12/25 01:44:45 dillon Exp $
  33  * $DragonFly: src/sys/vfs/nwfs/nwfs_node.c,v 1.27 2007/08/08 00:12:52 swildner Exp $
  34  */
  35 #include <sys/param.h>
  36 #include <sys/systm.h>
  37 #include <sys/kernel.h>
  38 #include <sys/time.h>
  39 #include <sys/proc.h>
  40 #include <sys/mount.h>
  41 #include <sys/vnode.h>
  42 #include <sys/malloc.h>
  43 #include <sys/sysctl.h>
  44 #include <vm/vm.h>
  45 #include <vm/vm_extern.h>
  46 #include <vm/vm_page.h>
  47 #include <vm/vm_object.h>
  48 #include <sys/queue.h>
  49
  50 #include <netproto/ncp/ncp.h>
  51 #include <netproto/ncp/ncp_conn.h>
  52 #include <netproto/ncp/ncp_subr.h>
  53
  54 #include "nwfs.h"
  55 #include "nwfs_mount.h"
  56 #include "nwfs_node.h"
  57 #include "nwfs_subr.h"
  58
  59 #define NWNOHASH(fhsum) (&nwhashtbl[(fhsum.f_id) & nwnodehash])
  60
  61 static LIST_HEAD(nwnode_hash_head,nwnode) *nwhashtbl;
  62 static u_long nwnodehash;
  63 static struct lock nwhashlock;
  64
  65 MALLOC_DEFINE(M_NWNODE, "NWFS node", "NWFS vnode private part");
  66 MALLOC_DEFINE(M_NWFSHASH, "NWFS hash", "NWFS has table");
  67
  68 static int nwfs_sysctl_vnprint(SYSCTL_HANDLER_ARGS);
  69
  70 SYSCTL_DECL(_vfs_nwfs);
  71
  72 SYSCTL_PROC(_vfs_nwfs, OID_AUTO, vnprint, CTLFLAG_WR|CTLTYPE_OPAQUE,
  73             NULL, 0, nwfs_sysctl_vnprint, "S,vnlist", "vnode hash");
  74
  75 void
  76 nwfs_hash_init(void)
  77 {
  78         nwhashtbl = hashinit(desiredvnodes, M_NWFSHASH, &nwnodehash);
  79         lockinit(&nwhashlock, "nwfshl", 0, 0);
  80 }
  81
  82 void
  83 nwfs_hash_free(void)
  84 {
  85         kfree(nwhashtbl, M_NWFSHASH);
  86 }
  87
  88 int
  89 nwfs_sysctl_vnprint(SYSCTL_HANDLER_ARGS)
  90 {
  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         kprintf("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(NULL, vp);
 104                         kprintf("%s:%d:%d:%d:%d\n",
 105                                 np->n_name, vp->v_sysref.refcnt, vp->v_auxrefs,
 106                                 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         nhpp = NWNOHASH(fid);
 123         LIST_FOREACH(np, nhpp, n_hash) {
 124                 if (nmp != np->n_mount || !NWCMPF(&fid, &np->n_fid))
 125                         continue;
 126                 if (npp)
 127                         *npp = np;
 128                 return 0;
 129         }
 130         return ENOENT;
 131 }
 132
 133 /*
 134  * Allocate new nwfsnode/vnode from given nwnode.
 135  * Vnode referenced and not locked.
 136  */
 137 int
 138 nwfs_allocvp(struct mount *mp, ncpfid fid, struct vnode **vpp)
 139 {
 140         struct nwnode *np;
 141         struct nwnode_hash_head *nhpp;
 142         struct nwmount *nmp = VFSTONWFS(mp);
 143         struct vnode *vp;
 144         int error;
 145
 146 loop:
 147         lockmgr(&nwhashlock, LK_EXCLUSIVE);
 148 rescan:
 149         if (nwfs_hashlookup(nmp, fid, &np) == 0) {
 150                 vp = NWTOV(np);
 151                 lockmgr(&nwhashlock, LK_RELEASE);
 152                 if (vget(vp, LK_EXCLUSIVE))
 153                         goto loop;
 154                 if (nwfs_hashlookup(nmp, fid, &np) || NWTOV(np) != vp) {
 155                         vput(vp);
 156                         goto loop;
 157                 }
 158                 *vpp = vp;
 159                 return(0);
 160         }
 161         lockmgr(&nwhashlock, LK_RELEASE);
 162
 163         /*
 164          * Do the MALLOC before the getnewvnode since doing so afterward
 165          * might cause a bogus v_data pointer to get dereferenced
 166          * elsewhere if MALLOC should block.
 167          */
 168         MALLOC(np, struct nwnode *, sizeof *np, M_NWNODE, M_WAITOK | M_ZERO);
 169         error = getnewvnode(VT_NWFS, mp, &vp, 0, 0);
 170         if (error) {
 171                 *vpp = NULL;
 172                 FREE(np, M_NWNODE);
 173                 return (error);
 174         }
 175         np->n_vnode = vp;
 176         np->n_mount = nmp;
 177
 178         /*
 179          * Another process can create vnode while we blocked in malloc() or
 180          * getnewvnode(). Rescan list again.
 181          */
 182         lockmgr(&nwhashlock, LK_EXCLUSIVE);
 183         if (nwfs_hashlookup(nmp, fid, NULL) == 0) {
 184                 np->n_vnode = NULL;
 185                 vx_put(vp);
 186                 kfree(np, M_NWNODE);
 187                 goto rescan;
 188         }
 189         *vpp = vp;
 190         vp->v_data = np;
 191         np->n_fid = fid;
 192         np->n_flag |= NNEW;
 193         lockinit(&np->n_lock, "nwnode", VLKTIMEOUT, LK_CANRECURSE);
 194         nhpp = NWNOHASH(fid);
 195         LIST_INSERT_HEAD(nhpp, np, n_hash);
 196         lockmgr(&nwhashlock, LK_RELEASE);
 197         return 0;
 198 }
 199
 200 int
 201 nwfs_lookupnp(struct nwmount *nmp, ncpfid fid, struct thread *td,
 202               struct nwnode **npp)
 203 {
 204         int error;
 205
 206         lockmgr(&nwhashlock, LK_EXCLUSIVE);
 207         error = nwfs_hashlookup(nmp, fid, npp);
 208         lockmgr(&nwhashlock, LK_RELEASE);
 209         return error;
 210 }
 211
 212 /*
 213  * Free nwnode, and give vnode back to system
 214  *
 215  * nwfs_reclaim(struct vnode *a_vp)
 216  */
 217 int
 218 nwfs_reclaim(struct vop_reclaim_args *ap)
 219 {
 220         struct vnode *dvp = NULL, *vp = ap->a_vp;
 221         struct nwnode *dnp, *np = VTONW(vp);
 222         struct nwmount *nmp = VTONWFS(vp);
 223         struct thread *td = curthread;  /* XXX */
 224
 225         NCPVNDEBUG("%s,%d\n", (np ? np->n_name : "?"), vp->v_sysref.refcnt);
 226         if (np && np->n_refparent) {
 227                 np->n_refparent = 0;
 228                 if (nwfs_lookupnp(nmp, np->n_parent, td, &dnp) == 0) {
 229                         dvp = dnp->n_vnode;
 230                 } else {
 231                         NCPVNDEBUG("%s: has no parent ?\n",np->n_name);
 232                 }
 233         }
 234         if (np) {
 235                 lockmgr(&nwhashlock, LK_EXCLUSIVE);
 236                 LIST_REMOVE(np, n_hash);
 237                 lockmgr(&nwhashlock, LK_RELEASE);
 238         }
 239         if (nmp->n_root == np)
 240                 nmp->n_root = NULL;
 241         vp->v_data = NULL;
 242         if (np)
 243                 kfree(np, M_NWNODE);
 244         if (dvp)
 245                 vrele(dvp);
 246         return (0);
 247 }
 248
 249 /*
 250  * nwfs_inactive(struct vnode *a_vp)
 251  */
 252 int
 253 nwfs_inactive(struct vop_inactive_args *ap)
 254 {
 255         struct thread *td = curthread;  /* XXX */
 256         struct ucred *cred;
 257         struct vnode *vp = ap->a_vp;
 258         struct nwnode *np = VTONW(vp);
 259         int error;
 260
 261         KKASSERT(td->td_proc);          /* XXX */
 262         cred = td->td_proc->p_ucred;    /* XXX */
 263
 264         NCPVNDEBUG("%s: %d\n", VTONW(vp)->n_name, vp->v_sysref.refcnt);
 265         if (np && np->opened) {
 266                 error = nwfs_vinvalbuf(vp, V_SAVE, 1);
 267                 error = ncp_close_file(NWFSTOCONN(VTONWFS(vp)), &np->n_fh, td, cred);
 268                 np->opened = 0;
 269         }
 270         if (np == NULL || (np->n_flag & NSHOULDFREE)) {
 271                 vgone_vxlocked(vp);
 272         }
 273         return (0);
 274 }
 275 /*
 276  * routines to maintain vnode attributes cache
 277  * nwfs_attr_cacheenter: unpack np.i to va structure
 278  */
 279 void
 280 nwfs_attr_cacheenter(struct vnode *vp, const struct nw_entry_info *fi)
 281 {
 282         struct nwnode *np = VTONW(vp);
 283         struct nwmount *nmp = VTONWFS(vp);
 284         struct vattr *va = &np->n_vattr;
 285
 286         va->va_type = vp->v_type;               /* vnode type (for create) */
 287         np->n_nmlen = fi->nameLen;
 288         bcopy(fi->entryName, np->n_name, np->n_nmlen);
 289         np->n_name[fi->nameLen] = 0;
 290         if (vp->v_type == VREG) {
 291                 if (va->va_size != fi->dataStreamSize) {
 292                         va->va_size = fi->dataStreamSize;
 293                         vnode_pager_setsize(vp, va->va_size);
 294                 }
 295                 va->va_mode = nmp->m.file_mode; /* files access mode and type */
 296         } else if (vp->v_type == VDIR) {
 297                 va->va_size = 16384;            /* should be a better way ... */
 298                 va->va_mode = nmp->m.dir_mode;  /* files access mode and type */
 299         } else
 300                 return;
 301         np->n_size = va->va_size;
 302         va->va_nlink = 1;               /* number of references to file */
 303         va->va_uid = nmp->m.uid;        /* owner user id */
 304         va->va_gid = nmp->m.gid;        /* owner group id */
 305         va->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
 306         va->va_fileid = np->n_fid.f_id; /* file id */
 307         if (va->va_fileid == 0)
 308                 va->va_fileid = NWFS_ROOT_INO;
 309         va->va_blocksize=nmp->connh->nh_conn->buffer_size;/* blocksize preferred for i/o */
 310         /* time of last modification */
 311         ncp_dos2unixtime(fi->modifyDate, fi->modifyTime, 0, nmp->m.tz, &va->va_mtime);
 312         /* time of last access */
 313         ncp_dos2unixtime(fi->lastAccessDate, 0, 0, nmp->m.tz, &va->va_atime);
 314         va->va_ctime = va->va_mtime;    /* time file changed */
 315         va->va_gen = VNOVAL;            /* generation number of file */
 316         va->va_flags = 0;               /* flags defined for file */
 317         va->va_rmajor = VNOVAL;         /* device the special file represents */
 318         va->va_rminor = VNOVAL;
 319         va->va_bytes = va->va_size;     /* bytes of disk space held by file */
 320         va->va_filerev = 0;             /* file modification number */
 321         va->va_vaflags = 0;             /* operations flags */
 322         np->n_vattr = *va;
 323         if (np->n_mtime == 0) {
 324                 np->n_mtime = va->va_mtime.tv_sec;
 325         }
 326         np->n_atime = time_second;
 327         np->n_dosfid = fi->DosDirNum;
 328         return;
 329 }
 330
 331 int
 332 nwfs_attr_cachelookup(struct vnode *vp, struct vattr *va)
 333 {
 334         struct nwnode *np = VTONW(vp);
 335         int diff;
 336
 337         diff = time_second - np->n_atime;
 338         if (diff > 2) { /* XXX should be configurable */
 339                 return ENOENT;
 340         }
 341         *va = np->n_vattr;
 342         return 0;
 343 }