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 * $FreeBSD$ 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 error = insmntque(vp, mp); /* XXX: Too early for mpsafe fs */ 178 if (error != 0) { 179 FREE(np, M_NWNODE); 180 *vpp = NULL; 181 return (error); 182 } 183 vp->v_data = np; 184 np->n_vnode = vp; 185 np->n_mount = nmp; 186 np->n_attr = fap->attributes; 187 vp->v_type = np->n_attr & aDIR ? VDIR : VREG; 188 np->n_fid = fid; 189 if (dvp) { 190 np->n_parent = VTONW(dvp)->n_fid; 191 } 192 vp->v_vnlock->lk_flags |= LK_CANRECURSE; 193 lockmgr(&nwhashlock, LK_EXCLUSIVE, NULL, td); 194 /* 195 * Another process can create vnode while we blocked in malloc() or 196 * getnewvnode(). Rescan list again. 197 */ 198 if (nwfs_hashlookup(nmp, fid, NULL) == 0) { 199 vp->v_data = NULL; 200 np->n_vnode = NULL; 201 vrele(vp); 202 FREE(np, M_NWNODE); 203 goto rescan; 204 } 205 *vpp = vp; 206 nhpp = NWNOHASH(fid); 207 LIST_INSERT_HEAD(nhpp, np, n_hash); 208 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 209 lockmgr(&nwhashlock, LK_RELEASE, NULL, td); 210 211 ASSERT_VOP_LOCKED(dvp, "nwfs_allocvp"); 212 if (vp->v_type == VDIR && dvp && (dvp->v_vflag & VV_ROOT) == 0) { 213 np->n_flag |= NREFPARENT; 214 vref(dvp); 215 } 216 return 0; 217 } 218 219 int 220 nwfs_nget(struct mount *mp, ncpfid fid, struct nw_entry_info *fap, 221 struct vnode *dvp, struct vnode **vpp) 222 { 223 struct vnode *vp; 224 int error; 225 226 *vpp = NULL; 227 error = nwfs_allocvp(mp, fid, fap, dvp, &vp); 228 if (error) 229 return error; 230 if (fap) 231 nwfs_attr_cacheenter(vp, fap); 232 *vpp = vp; 233 return 0; 234 } 235 236 int 237 nwfs_lookupnp(struct nwmount *nmp, ncpfid fid, struct thread *td, 238 struct nwnode **npp) 239 { 240 int error; 241 242 lockmgr(&nwhashlock, LK_EXCLUSIVE, NULL, td); 243 error = nwfs_hashlookup(nmp, fid, npp); 244 lockmgr(&nwhashlock, LK_RELEASE, NULL, td); 245 return error; 246 } 247 248 /* 249 * Free nwnode, and give vnode back to system 250 */ 251 int 252 nwfs_reclaim(ap) 253 struct vop_reclaim_args /* { 254 struct vnode *a_vp; 255 struct thread *a_td; 256 } */ *ap; 257 { 258 struct vnode *dvp = NULL, *vp = ap->a_vp; 259 struct nwnode *dnp, *np = VTONW(vp); 260 struct nwmount *nmp = VTONWFS(vp); 261 struct thread *td = ap->a_td; 262 263 NCPVNDEBUG("%s,%d\n", np->n_name, vrefcnt(vp)); 264 /* 265 * Destroy the vm object and flush associated pages. 266 */ 267 vnode_destroy_vobject(vp); 268 269 if (np->n_flag & NREFPARENT) { 270 np->n_flag &= ~NREFPARENT; 271 if (nwfs_lookupnp(nmp, np->n_parent, td, &dnp) == 0) { 272 dvp = dnp->n_vnode; 273 } else { 274 NCPVNDEBUG("%s: has no parent ?\n",np->n_name); 275 } 276 } 277 lockmgr(&nwhashlock, LK_EXCLUSIVE, NULL, td); 278 LIST_REMOVE(np, n_hash); 279 lockmgr(&nwhashlock, LK_RELEASE, NULL, td); 280 if (nmp->n_root == np) { 281 nmp->n_root = NULL; 282 } 283 vp->v_data = NULL; 284 FREE(np, M_NWNODE); 285 if (dvp) { 286 vrele(dvp); 287 } 288 return (0); 289 } 290 291 int 292 nwfs_inactive(ap) 293 struct vop_inactive_args /* { 294 struct vnode *a_vp; 295 struct thread *a_td; 296 } */ *ap; 297 { 298 struct thread *td = ap->a_td; 299 struct ucred *cred = td->td_ucred; 300 struct vnode *vp = ap->a_vp; 301 struct nwnode *np = VTONW(vp); 302 int error; 303 304 NCPVNDEBUG("%s: %d\n", VTONW(vp)->n_name, vrefcnt(vp)); 305 if (np->opened) { 306 error = nwfs_vinvalbuf(vp, td); 307 error = ncp_close_file(NWFSTOCONN(VTONWFS(vp)), &np->n_fh, td, cred); 308 np->opened = 0; 309 } 310 if (np->n_flag & NSHOULDFREE) { 311 cache_purge(vp); 312 vgone(vp); 313 } 314 return (0); 315 } 316 /* 317 * routines to maintain vnode attributes cache 318 * nwfs_attr_cacheenter: unpack np.i to va structure 319 */ 320 void 321 nwfs_attr_cacheenter(struct vnode *vp, struct nw_entry_info *fi) 322 { 323 struct nwnode *np = VTONW(vp); 324 struct nwmount *nmp = VTONWFS(vp); 325 struct vattr *va = &np->n_vattr; 326 327 va->va_type = vp->v_type; /* vnode type (for create) */ 328 np->n_nmlen = fi->nameLen; 329 bcopy(fi->entryName, np->n_name, np->n_nmlen); 330 np->n_name[fi->nameLen] = 0; 331 if (vp->v_type == VREG) { 332 if (va->va_size != fi->dataStreamSize) { 333 va->va_size = fi->dataStreamSize; 334 vnode_pager_setsize(vp, va->va_size); 335 } 336 va->va_mode = nmp->m.file_mode; /* files access mode and type */ 337 } else if (vp->v_type == VDIR) { 338 va->va_size = 16384; /* should be a better way ... */ 339 va->va_mode = nmp->m.dir_mode; /* files access mode and type */ 340 } else 341 return; 342 np->n_size = va->va_size; 343 va->va_nlink = 1; /* number of references to file */ 344 va->va_uid = nmp->m.uid; /* owner user id */ 345 va->va_gid = nmp->m.gid; /* owner group id */ 346 va->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 347 va->va_fileid = np->n_fid.f_id; /* file id */ 348 if (va->va_fileid == 0) 349 va->va_fileid = NWFS_ROOT_INO; 350 va->va_blocksize=nmp->connh->nh_conn->buffer_size;/* blocksize preferred for i/o */ 351 /* time of last modification */ 352 ncp_dos2unixtime(fi->modifyDate, fi->modifyTime, 0, nmp->m.tz, &va->va_mtime); 353 /* time of last access */ 354 ncp_dos2unixtime(fi->lastAccessDate, 0, 0, nmp->m.tz, &va->va_atime); 355 va->va_ctime = va->va_mtime; /* time file changed */ 356 va->va_gen = VNOVAL; /* generation number of file */ 357 va->va_flags = 0; /* flags defined for file */ 358 va->va_rdev = VNOVAL; /* device the special file represents */ 359 va->va_bytes = va->va_size; /* bytes of disk space held by file */ 360 va->va_filerev = 0; /* file modification number */ 361 va->va_vaflags = 0; /* operations flags */ 362 np->n_vattr = *va; 363 if (np->n_mtime == 0) { 364 np->n_mtime = va->va_mtime.tv_sec; 365 } 366 np->n_atime = time_second; 367 np->n_dosfid = fi->DosDirNum; 368 return; 369 } 370 371 int 372 nwfs_attr_cachelookup(struct vnode *vp, struct vattr *va) 373 { 374 struct nwnode *np = VTONW(vp); 375 int diff; 376 377 diff = time_second - np->n_atime; 378 if (diff > 2) { /* XXX should be configurable */ 379 return ENOENT; 380 } 381 *va = np->n_vattr; 382 return 0; 383 }
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