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 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: releng/9.0/sys/fs/nwfs/nwfs_node.c 211531 2010-08-20 19:46:50Z jhb $ 27 */ 28 #include <sys/param.h> 29 #include <sys/systm.h> 30 #include <sys/kernel.h> 31 #include <sys/lock.h> 32 #include <sys/malloc.h> 33 #include <sys/mount.h> 34 #include <sys/mutex.h> 35 #include <sys/proc.h> 36 #include <sys/queue.h> 37 #include <sys/sx.h> 38 #include <sys/sysctl.h> 39 #include <sys/time.h> 40 #include <sys/vnode.h> 41 42 #include <vm/vm.h> 43 #include <vm/vm_extern.h> 44 #include <vm/vm_page.h> 45 #include <vm/vm_object.h> 46 47 #include <netncp/ncp.h> 48 #include <netncp/ncp_conn.h> 49 #include <netncp/ncp_subr.h> 50 51 #include <fs/nwfs/nwfs.h> 52 #include <fs/nwfs/nwfs_mount.h> 53 #include <fs/nwfs/nwfs_node.h> 54 #include <fs/nwfs/nwfs_subr.h> 55 56 #define NWNOHASH(fhsum) (&nwhashtbl[(fhsum.f_id) & nwnodehash]) 57 58 static LIST_HEAD(nwnode_hash_head,nwnode) *nwhashtbl; 59 static u_long nwnodehash; 60 static struct sx nwhashlock; 61 62 static MALLOC_DEFINE(M_NWNODE, "nwfs_node", "NWFS vnode private part"); 63 static MALLOC_DEFINE(M_NWFSHASH, "nwfs_hash", "NWFS has table"); 64 65 static int nwfs_sysctl_vnprint(SYSCTL_HANDLER_ARGS); 66 67 SYSCTL_DECL(_vfs_nwfs); 68 69 SYSCTL_PROC(_vfs_nwfs, OID_AUTO, vnprint, CTLFLAG_WR|CTLTYPE_OPAQUE, 70 NULL, 0, nwfs_sysctl_vnprint, "S,vnlist", "vnode hash"); 71 72 void 73 nwfs_hash_init(void) { 74 nwhashtbl = hashinit(desiredvnodes, M_NWFSHASH, &nwnodehash); 75 sx_init(&nwhashlock, "nwfshl"); 76 } 77 78 void 79 nwfs_hash_free(void) { 80 sx_destroy(&nwhashlock); 81 free(nwhashtbl, M_NWFSHASH); 82 } 83 84 int 85 nwfs_sysctl_vnprint(SYSCTL_HANDLER_ARGS) { 86 struct nwnode *np; 87 struct nwnode_hash_head *nhpp; 88 struct vnode *vp; 89 int i; 90 91 if (nwfs_debuglevel == 0) 92 return 0; 93 printf("Name:uc:hc:fid:pfid\n"); 94 for(i = 0; i <= nwnodehash; i++) { 95 nhpp = &nwhashtbl[i]; 96 LIST_FOREACH(np, nhpp, n_hash) { 97 vp = NWTOV(np); 98 vprint("", vp); 99 printf("%s:%d:%d:%d:%d\n",np->n_name,vrefcnt(vp), 100 vp->v_holdcnt,np->n_fid.f_id, np->n_fid.f_parent); 101 } 102 } 103 return 0; 104 } 105 106 /* 107 * Search nwnode with given fid. 108 * Hash list should be locked by caller. 109 */ 110 static int 111 nwfs_hashlookup(struct nwmount *nmp, ncpfid fid, struct nwnode **npp) 112 { 113 struct nwnode *np; 114 struct nwnode_hash_head *nhpp; 115 116 sx_assert(&nwhashlock, SA_XLOCKED); 117 118 nhpp = NWNOHASH(fid); 119 LIST_FOREACH(np, nhpp, n_hash) { 120 if (nmp != np->n_mount || !NWCMPF(&fid, &np->n_fid)) 121 continue; 122 if (npp) 123 *npp = np; 124 return 0; 125 } 126 return ENOENT; 127 } 128 129 /* 130 * Allocate new nwfsnode/vnode from given nwnode. 131 * Vnode referenced and not locked. 132 */ 133 static int 134 nwfs_allocvp(struct mount *mp, ncpfid fid, struct nw_entry_info *fap, 135 struct vnode *dvp, struct vnode **vpp) 136 { 137 struct nwnode *np; 138 struct nwnode_hash_head *nhpp; 139 struct nwmount *nmp = VFSTONWFS(mp); 140 struct vnode *vp; 141 int error; 142 143 loop: 144 sx_xlock(&nwhashlock); 145 rescan: 146 if (nwfs_hashlookup(nmp, fid, &np) == 0) { 147 vp = NWTOV(np); 148 VI_LOCK(vp); 149 sx_xunlock(&nwhashlock); 150 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, curthread)) 151 goto loop; 152 if (fap) 153 np->n_attr = fap->attributes; 154 *vpp = vp; 155 return(0); 156 } 157 sx_xunlock(&nwhashlock); 158 159 if (fap == NULL || ((fap->attributes & aDIR) == 0 && dvp == NULL)) 160 panic("nwfs_allocvp: fap = %p, dvp = %p\n", fap, dvp); 161 /* 162 * Do the MALLOC before the getnewvnode since doing so afterward 163 * might cause a bogus v_data pointer to get dereferenced 164 * elsewhere if MALLOC should block. 165 */ 166 np = malloc(sizeof *np, M_NWNODE, M_WAITOK | M_ZERO); 167 error = getnewvnode("nwfs", mp, &nwfs_vnodeops, &vp); 168 if (error) { 169 *vpp = NULL; 170 free(np, M_NWNODE); 171 return (error); 172 } 173 error = insmntque(vp, mp); /* XXX: Too early for mpsafe fs */ 174 if (error != 0) { 175 free(np, M_NWNODE); 176 *vpp = NULL; 177 return (error); 178 } 179 vp->v_data = np; 180 np->n_vnode = vp; 181 np->n_mount = nmp; 182 np->n_attr = fap->attributes; 183 vp->v_type = np->n_attr & aDIR ? VDIR : VREG; 184 np->n_fid = fid; 185 if (dvp) { 186 np->n_parent = VTONW(dvp)->n_fid; 187 } 188 sx_xlock(&nwhashlock); 189 /* 190 * Another process can create vnode while we blocked in malloc() or 191 * getnewvnode(). Rescan list again. 192 */ 193 if (nwfs_hashlookup(nmp, fid, NULL) == 0) { 194 vp->v_data = NULL; 195 np->n_vnode = NULL; 196 vrele(vp); 197 free(np, M_NWNODE); 198 goto rescan; 199 } 200 *vpp = vp; 201 nhpp = NWNOHASH(fid); 202 LIST_INSERT_HEAD(nhpp, np, n_hash); 203 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 204 VN_LOCK_AREC(vp); 205 sx_xunlock(&nwhashlock); 206 207 ASSERT_VOP_LOCKED(dvp, "nwfs_allocvp"); 208 if (vp->v_type == VDIR && dvp && (dvp->v_vflag & VV_ROOT) == 0) { 209 np->n_flag |= NREFPARENT; 210 vref(dvp); 211 } 212 return 0; 213 } 214 215 int 216 nwfs_nget(struct mount *mp, ncpfid fid, struct nw_entry_info *fap, 217 struct vnode *dvp, struct vnode **vpp) 218 { 219 struct vnode *vp; 220 int error; 221 222 *vpp = NULL; 223 error = nwfs_allocvp(mp, fid, fap, dvp, &vp); 224 if (error) 225 return error; 226 if (fap) 227 nwfs_attr_cacheenter(vp, fap); 228 *vpp = vp; 229 return 0; 230 } 231 232 int 233 nwfs_lookupnp(struct nwmount *nmp, ncpfid fid, struct thread *td, 234 struct nwnode **npp) 235 { 236 int error; 237 238 sx_xlock(&nwhashlock); 239 error = nwfs_hashlookup(nmp, fid, npp); 240 sx_xunlock(&nwhashlock); 241 return error; 242 } 243 244 /* 245 * Free nwnode, and give vnode back to system 246 */ 247 int 248 nwfs_reclaim(ap) 249 struct vop_reclaim_args /* { 250 struct vnode *a_vp; 251 struct thread *a_td; 252 } */ *ap; 253 { 254 struct vnode *dvp = NULL, *vp = ap->a_vp; 255 struct nwnode *dnp, *np = VTONW(vp); 256 struct nwmount *nmp = VTONWFS(vp); 257 struct thread *td = ap->a_td; 258 259 NCPVNDEBUG("%s,%d\n", np->n_name, vrefcnt(vp)); 260 /* 261 * Destroy the vm object and flush associated pages. 262 */ 263 vnode_destroy_vobject(vp); 264 265 if (np->n_flag & NREFPARENT) { 266 np->n_flag &= ~NREFPARENT; 267 if (nwfs_lookupnp(nmp, np->n_parent, td, &dnp) == 0) { 268 dvp = dnp->n_vnode; 269 } else { 270 NCPVNDEBUG("%s: has no parent ?\n",np->n_name); 271 } 272 } 273 sx_xlock(&nwhashlock); 274 LIST_REMOVE(np, n_hash); 275 sx_xunlock(&nwhashlock); 276 if (nmp->n_root == np) { 277 nmp->n_root = NULL; 278 } 279 vp->v_data = NULL; 280 free(np, M_NWNODE); 281 if (dvp) { 282 vrele(dvp); 283 } 284 return (0); 285 } 286 287 int 288 nwfs_inactive(ap) 289 struct vop_inactive_args /* { 290 struct vnode *a_vp; 291 struct thread *a_td; 292 } */ *ap; 293 { 294 struct thread *td = ap->a_td; 295 struct ucred *cred = td->td_ucred; 296 struct vnode *vp = ap->a_vp; 297 struct nwnode *np = VTONW(vp); 298 int error; 299 300 NCPVNDEBUG("%s: %d\n", VTONW(vp)->n_name, vrefcnt(vp)); 301 if (np->opened) { 302 error = nwfs_vinvalbuf(vp, td); 303 error = ncp_close_file(NWFSTOCONN(VTONWFS(vp)), &np->n_fh, td, cred); 304 np->opened = 0; 305 } 306 if (np->n_flag & NSHOULDFREE) { 307 cache_purge(vp); 308 vgone(vp); 309 } 310 return (0); 311 } 312 /* 313 * routines to maintain vnode attributes cache 314 * nwfs_attr_cacheenter: unpack np.i to va structure 315 */ 316 void 317 nwfs_attr_cacheenter(struct vnode *vp, struct nw_entry_info *fi) 318 { 319 struct nwnode *np = VTONW(vp); 320 struct nwmount *nmp = VTONWFS(vp); 321 struct vattr *va = &np->n_vattr; 322 323 va->va_type = vp->v_type; /* vnode type (for create) */ 324 np->n_nmlen = fi->nameLen; 325 bcopy(fi->entryName, np->n_name, np->n_nmlen); 326 np->n_name[fi->nameLen] = 0; 327 if (vp->v_type == VREG) { 328 if (va->va_size != fi->dataStreamSize) { 329 va->va_size = fi->dataStreamSize; 330 vnode_pager_setsize(vp, va->va_size); 331 } 332 va->va_mode = nmp->m.file_mode; /* files access mode and type */ 333 } else if (vp->v_type == VDIR) { 334 va->va_size = 16384; /* should be a better way ... */ 335 va->va_mode = nmp->m.dir_mode; /* files access mode and type */ 336 } else 337 return; 338 np->n_size = va->va_size; 339 va->va_nlink = 1; /* number of references to file */ 340 va->va_uid = nmp->m.uid; /* owner user id */ 341 va->va_gid = nmp->m.gid; /* owner group id */ 342 va->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 343 va->va_fileid = np->n_fid.f_id; /* file id */ 344 if (va->va_fileid == 0) 345 va->va_fileid = NWFS_ROOT_INO; 346 va->va_blocksize=nmp->connh->nh_conn->buffer_size;/* blocksize preferred for i/o */ 347 /* time of last modification */ 348 ncp_dos2unixtime(fi->modifyDate, fi->modifyTime, 0, nmp->m.tz, &va->va_mtime); 349 /* time of last access */ 350 ncp_dos2unixtime(fi->lastAccessDate, 0, 0, nmp->m.tz, &va->va_atime); 351 va->va_ctime = va->va_mtime; /* time file changed */ 352 va->va_gen = VNOVAL; /* generation number of file */ 353 va->va_flags = 0; /* flags defined for file */ 354 va->va_rdev = VNOVAL; /* device the special file represents */ 355 va->va_bytes = va->va_size; /* bytes of disk space held by file */ 356 va->va_filerev = 0; /* file modification number */ 357 va->va_vaflags = 0; /* operations flags */ 358 np->n_vattr = *va; 359 if (np->n_mtime == 0) { 360 np->n_mtime = va->va_mtime.tv_sec; 361 } 362 np->n_atime = time_second; 363 np->n_dosfid = fi->DosDirNum; 364 return; 365 } 366 367 int 368 nwfs_attr_cachelookup(struct vnode *vp, struct vattr *va) 369 { 370 struct nwnode *np = VTONW(vp); 371 int diff; 372 373 diff = time_second - np->n_atime; 374 if (diff > 2) { /* XXX should be configurable */ 375 return ENOENT; 376 } 377 *va = np->n_vattr; 378 return 0; 379 }
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