Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/fs/smbfs/smbfs_node.c
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1 /*- 2 * Copyright (c) 2000-2001 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/kdb.h> 37 #include <sys/kernel.h> 38 #include <sys/lock.h> 39 #include <sys/malloc.h> 40 #include <sys/mount.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 <netsmb/smb.h> 48 #include <netsmb/smb_conn.h> 49 #include <netsmb/smb_subr.h> 50 51 #include <vm/vm.h> 52 #include <vm/vm_extern.h> 53 /*#include <vm/vm_page.h> 54 #include <vm/vm_object.h>*/ 55 56 #include <fs/smbfs/smbfs.h> 57 #include <fs/smbfs/smbfs_node.h> 58 #include <fs/smbfs/smbfs_subr.h> 59 60 #define SMBFS_NOHASH(smp, hval) (&(smp)->sm_hash[(hval) & (smp)->sm_hashlen]) 61 #define smbfs_hash_lock(smp, td) lockmgr(&smp->sm_hashlock, LK_EXCLUSIVE, NULL, td) 62 #define smbfs_hash_unlock(smp, td) lockmgr(&smp->sm_hashlock, LK_RELEASE, NULL, td) 63 64 65 extern vop_t **smbfs_vnodeop_p; 66 67 MALLOC_DEFINE(M_SMBNODE, "SMBFS node", "SMBFS vnode private part"); 68 static MALLOC_DEFINE(M_SMBNODENAME, "SMBFS nname", "SMBFS node name"); 69 70 int smbfs_hashprint(struct mount *mp); 71 72 #if 0 73 #ifdef SYSCTL_DECL 74 SYSCTL_DECL(_vfs_smbfs); 75 #endif 76 SYSCTL_PROC(_vfs_smbfs, OID_AUTO, vnprint, CTLFLAG_WR|CTLTYPE_OPAQUE, 77 NULL, 0, smbfs_hashprint, "S,vnlist", "vnode hash"); 78 #endif 79 80 #define FNV_32_PRIME ((u_int32_t) 0x01000193UL) 81 #define FNV1_32_INIT ((u_int32_t) 33554467UL) 82 83 u_int32_t 84 smbfs_hash(const u_char *name, int nmlen) 85 { 86 u_int32_t v; 87 88 for (v = FNV1_32_INIT; nmlen; name++, nmlen--) { 89 v *= FNV_32_PRIME; 90 v ^= (u_int32_t)*name; 91 } 92 return v; 93 } 94 95 int 96 smbfs_hashprint(struct mount *mp) 97 { 98 struct smbmount *smp = VFSTOSMBFS(mp); 99 struct smbnode_hashhead *nhpp; 100 struct smbnode *np; 101 int i; 102 103 for(i = 0; i <= smp->sm_hashlen; i++) { 104 nhpp = &smp->sm_hash[i]; 105 LIST_FOREACH(np, nhpp, n_hash) 106 vprint(NULL, SMBTOV(np)); 107 } 108 return 0; 109 } 110 111 static char * 112 smbfs_name_alloc(const u_char *name, int nmlen) 113 { 114 u_char *cp; 115 116 nmlen++; 117 #ifdef SMBFS_NAME_DEBUG 118 cp = malloc(nmlen + 2 + sizeof(int), M_SMBNODENAME, M_WAITOK); 119 *(int*)cp = nmlen; 120 cp += sizeof(int); 121 cp[0] = 0xfc; 122 cp++; 123 bcopy(name, cp, nmlen - 1); 124 cp[nmlen] = 0xfe; 125 #else 126 cp = malloc(nmlen, M_SMBNODENAME, M_WAITOK); 127 bcopy(name, cp, nmlen - 1); 128 #endif 129 cp[nmlen - 1] = 0; 130 return cp; 131 } 132 133 static void 134 smbfs_name_free(u_char *name) 135 { 136 #ifdef SMBFS_NAME_DEBUG 137 int nmlen, slen; 138 u_char *cp; 139 140 cp = name; 141 cp--; 142 if (*cp != 0xfc) { 143 printf("First byte of name entry '%s' corrupted\n", name); 144 kdb_enter("ditto"); 145 } 146 cp -= sizeof(int); 147 nmlen = *(int*)cp; 148 slen = strlen(name) + 1; 149 if (nmlen != slen) { 150 printf("Name length mismatch: was %d, now %d name '%s'\n", 151 nmlen, slen, name); 152 kdb_enter("ditto"); 153 } 154 if (name[nmlen] != 0xfe) { 155 printf("Last byte of name entry '%s' corrupted\n", name); 156 kdb_enter("ditto"); 157 } 158 free(cp, M_SMBNODENAME); 159 #else 160 free(name, M_SMBNODENAME); 161 #endif 162 } 163 164 static int 165 smbfs_node_alloc(struct mount *mp, struct vnode *dvp, 166 const char *name, int nmlen, struct smbfattr *fap, struct vnode **vpp) 167 { 168 struct vattr vattr; 169 struct thread *td = curthread; /* XXX */ 170 struct smbmount *smp = VFSTOSMBFS(mp); 171 struct smbnode_hashhead *nhpp; 172 struct smbnode *np, *np2, *dnp; 173 struct vnode *vp; 174 u_long hashval; 175 int error; 176 177 *vpp = NULL; 178 if (smp->sm_root != NULL && dvp == NULL) { 179 SMBERROR("do not allocate root vnode twice!\n"); 180 return EINVAL; 181 } 182 if (nmlen == 2 && bcmp(name, "..", 2) == 0) { 183 if (dvp == NULL) 184 return EINVAL; 185 vp = VTOSMB(VTOSMB(dvp)->n_parent)->n_vnode; 186 error = vget(vp, LK_EXCLUSIVE, td); 187 if (error == 0) 188 *vpp = vp; 189 return error; 190 } else if (nmlen == 1 && name[0] == '.') { 191 SMBERROR("do not call me with dot!\n"); 192 return EINVAL; 193 } 194 dnp = dvp ? VTOSMB(dvp) : NULL; 195 if (dnp == NULL && dvp != NULL) { 196 vprint("smbfs_node_alloc: dead parent vnode", dvp); 197 return EINVAL; 198 } 199 hashval = smbfs_hash(name, nmlen); 200 retry: 201 smbfs_hash_lock(smp, td); 202 loop: 203 nhpp = SMBFS_NOHASH(smp, hashval); 204 LIST_FOREACH(np, nhpp, n_hash) { 205 vp = SMBTOV(np); 206 if (np->n_parent != dvp || 207 np->n_nmlen != nmlen || bcmp(name, np->n_name, nmlen) != 0) 208 continue; 209 VI_LOCK(vp); 210 smbfs_hash_unlock(smp, td); 211 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td) != 0) 212 goto retry; 213 /* Force cached attributes to be refreshed if stale. */ 214 (void)VOP_GETATTR(vp, &vattr, td->td_ucred, td); 215 /* 216 * If the file type on the server is inconsistent with 217 * what it was when we created the vnode, kill the 218 * bogus vnode now and fall through to the code below 219 * to create a new one with the right type. 220 */ 221 if ((vp->v_type == VDIR && (np->n_dosattr & SMB_FA_DIR) == 0) || 222 (vp->v_type == VREG && (np->n_dosattr & SMB_FA_DIR) != 0)) { 223 vput(vp); 224 vgone(vp); 225 break; 226 } 227 *vpp = vp; 228 return 0; 229 } 230 smbfs_hash_unlock(smp, td); 231 /* 232 * If we don't have node attributes, then it is an explicit lookup 233 * for an existing vnode. 234 */ 235 if (fap == NULL) 236 return ENOENT; 237 238 MALLOC(np, struct smbnode *, sizeof *np, M_SMBNODE, M_WAITOK); 239 error = getnewvnode("smbfs", mp, smbfs_vnodeop_p, &vp); 240 if (error) { 241 FREE(np, M_SMBNODE); 242 return error; 243 } 244 vp->v_type = fap->fa_attr & SMB_FA_DIR ? VDIR : VREG; 245 bzero(np, sizeof(*np)); 246 vp->v_data = np; 247 np->n_vnode = vp; 248 np->n_mount = VFSTOSMBFS(mp); 249 np->n_nmlen = nmlen; 250 np->n_name = smbfs_name_alloc(name, nmlen); 251 np->n_ino = fap->fa_ino; 252 253 if (dvp) { 254 ASSERT_VOP_LOCKED(dvp, "smbfs_node_alloc"); 255 np->n_parent = dvp; 256 if (/*vp->v_type == VDIR &&*/ (dvp->v_vflag & VV_ROOT) == 0) { 257 vref(dvp); 258 np->n_flag |= NREFPARENT; 259 } 260 } else if (vp->v_type == VREG) 261 SMBERROR("new vnode '%s' born without parent ?\n", np->n_name); 262 263 vp->v_vnlock->lk_flags |= LK_CANRECURSE; 264 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 265 266 smbfs_hash_lock(smp, td); 267 LIST_FOREACH(np2, nhpp, n_hash) { 268 if (np2->n_parent != dvp || 269 np2->n_nmlen != nmlen || bcmp(name, np2->n_name, nmlen) != 0) 270 continue; 271 vput(vp); 272 /* smb_name_free(np->n_name); 273 FREE(np, M_SMBNODE);*/ 274 goto loop; 275 } 276 LIST_INSERT_HEAD(nhpp, np, n_hash); 277 smbfs_hash_unlock(smp, td); 278 *vpp = vp; 279 return 0; 280 } 281 282 int 283 smbfs_nget(struct mount *mp, struct vnode *dvp, const char *name, int nmlen, 284 struct smbfattr *fap, struct vnode **vpp) 285 { 286 struct smbnode *np; 287 struct vnode *vp; 288 int error; 289 290 *vpp = NULL; 291 error = smbfs_node_alloc(mp, dvp, name, nmlen, fap, &vp); 292 if (error) 293 return error; 294 np = VTOSMB(vp); 295 if (fap) 296 smbfs_attr_cacheenter(vp, fap); 297 *vpp = vp; 298 return 0; 299 } 300 301 /* 302 * Free smbnode, and give vnode back to system 303 */ 304 int 305 smbfs_reclaim(ap) 306 struct vop_reclaim_args /* { 307 struct vnode *a_vp; 308 struct thread *a_p; 309 } */ *ap; 310 { 311 struct vnode *vp = ap->a_vp; 312 struct thread *td = ap->a_td; 313 struct vnode *dvp; 314 struct smbnode *np = VTOSMB(vp); 315 struct smbmount *smp = VTOSMBFS(vp); 316 317 SMBVDEBUG("%s,%d\n", np->n_name, vrefcnt(vp)); 318 319 KASSERT((np->n_flag & NOPEN) == 0, ("file not closed before reclaim")); 320 321 smbfs_hash_lock(smp, td); 322 323 dvp = (np->n_parent && (np->n_flag & NREFPARENT)) ? 324 np->n_parent : NULL; 325 326 if (np->n_hash.le_prev) 327 LIST_REMOVE(np, n_hash); 328 if (smp->sm_root == np) { 329 SMBVDEBUG("root vnode\n"); 330 smp->sm_root = NULL; 331 } 332 vp->v_data = NULL; 333 smbfs_hash_unlock(smp, td); 334 if (np->n_name) 335 smbfs_name_free(np->n_name); 336 FREE(np, M_SMBNODE); 337 if (dvp != NULL) { 338 vrele(dvp); 339 /* 340 * Indicate that we released something; see comment 341 * in smbfs_unmount(). 342 */ 343 smp->sm_didrele = 1; 344 } 345 return 0; 346 } 347 348 int 349 smbfs_inactive(ap) 350 struct vop_inactive_args /* { 351 struct vnode *a_vp; 352 struct thread *a_td; 353 } */ *ap; 354 { 355 struct thread *td = ap->a_td; 356 struct ucred *cred = td->td_ucred; 357 struct vnode *vp = ap->a_vp; 358 struct smbnode *np = VTOSMB(vp); 359 struct smb_cred scred; 360 struct vattr va; 361 362 SMBVDEBUG("%s: %d\n", VTOSMB(vp)->n_name, vrefcnt(vp)); 363 if ((np->n_flag & NOPEN) != 0) { 364 smb_makescred(&scred, td, cred); 365 smbfs_vinvalbuf(vp, V_SAVE, cred, td, 1); 366 if (vp->v_type == VREG) { 367 VOP_GETATTR(vp, &va, cred, td); 368 smbfs_smb_close(np->n_mount->sm_share, np->n_fid, 369 &np->n_mtime, &scred); 370 } else if (vp->v_type == VDIR) { 371 if (np->n_dirseq != NULL) { 372 smbfs_findclose(np->n_dirseq, &scred); 373 np->n_dirseq = NULL; 374 } 375 } 376 np->n_flag &= ~NOPEN; 377 smbfs_attr_cacheremove(vp); 378 } 379 VOP_UNLOCK(vp, 0, td); 380 if (np->n_flag & NGONE) 381 vrecycle(vp, NULL, td); 382 return (0); 383 } 384 /* 385 * routines to maintain vnode attributes cache 386 * smbfs_attr_cacheenter: unpack np.i to vattr structure 387 */ 388 void 389 smbfs_attr_cacheenter(struct vnode *vp, struct smbfattr *fap) 390 { 391 struct smbnode *np = VTOSMB(vp); 392 393 if (vp->v_type == VREG) { 394 if (np->n_size != fap->fa_size) { 395 np->n_size = fap->fa_size; 396 vnode_pager_setsize(vp, np->n_size); 397 } 398 } else if (vp->v_type == VDIR) { 399 np->n_size = 16384; /* should be a better way ... */ 400 } else 401 return; 402 np->n_mtime = fap->fa_mtime; 403 np->n_dosattr = fap->fa_attr; 404 np->n_attrage = time_second; 405 return; 406 } 407 408 int 409 smbfs_attr_cachelookup(struct vnode *vp, struct vattr *va) 410 { 411 struct smbnode *np = VTOSMB(vp); 412 struct smbmount *smp = VTOSMBFS(vp); 413 int diff; 414 415 diff = time_second - np->n_attrage; 416 if (diff > 2) /* XXX should be configurable */ 417 return ENOENT; 418 va->va_type = vp->v_type; /* vnode type (for create) */ 419 if (vp->v_type == VREG) { 420 va->va_mode = smp->sm_args.file_mode; /* files access mode and type */ 421 } else if (vp->v_type == VDIR) { 422 va->va_mode = smp->sm_args.dir_mode; /* files access mode and type */ 423 } else 424 return EINVAL; 425 va->va_size = np->n_size; 426 va->va_nlink = 1; /* number of references to file */ 427 va->va_uid = smp->sm_args.uid; /* owner user id */ 428 va->va_gid = smp->sm_args.gid; /* owner group id */ 429 va->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 430 va->va_fileid = np->n_ino; /* file id */ 431 if (va->va_fileid == 0) 432 va->va_fileid = 2; 433 va->va_blocksize = SSTOVC(smp->sm_share)->vc_txmax; 434 va->va_mtime = np->n_mtime; 435 va->va_atime = va->va_ctime = va->va_mtime; /* time file changed */ 436 va->va_gen = VNOVAL; /* generation number of file */ 437 va->va_flags = 0; /* flags defined for file */ 438 va->va_rdev = VNOVAL; /* device the special file represents */ 439 va->va_bytes = va->va_size; /* bytes of disk space held by file */ 440 va->va_filerev = 0; /* file modification number */ 441 va->va_vaflags = 0; /* operations flags */ 442 return 0; 443 }
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