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/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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