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: releng/8.0/sys/fs/smbfs/smbfs_node.c 184205 2008-10-23 15:53:51Z des $ 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/proc.h> 41 #include <sys/queue.h> 42 #include <sys/stat.h> 43 #include <sys/sx.h> 44 #include <sys/sysctl.h> 45 #include <sys/time.h> 46 #include <sys/vnode.h> 47 48 #include <netsmb/smb.h> 49 #include <netsmb/smb_conn.h> 50 #include <netsmb/smb_subr.h> 51 52 #include <vm/vm.h> 53 #include <vm/vm_extern.h> 54 /*#include <vm/vm_page.h> 55 #include <vm/vm_object.h>*/ 56 57 #include <fs/smbfs/smbfs.h> 58 #include <fs/smbfs/smbfs_node.h> 59 #include <fs/smbfs/smbfs_subr.h> 60 61 #define SMBFS_NOHASH(smp, hval) (&(smp)->sm_hash[(hval) & (smp)->sm_hashlen]) 62 #define smbfs_hash_lock(smp) sx_xlock(&smp->sm_hashlock) 63 #define smbfs_hash_unlock(smp) sx_xunlock(&smp->sm_hashlock) 64 65 extern struct vop_vector smbfs_vnodeops; /* XXX -> .h file */ 66 67 MALLOC_DEFINE(M_SMBNODE, "smbufs_node", "SMBFS vnode private part"); 68 static MALLOC_DEFINE(M_SMBNODENAME, "smbufs_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("", 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 panic("First byte of name entry '%s' corrupted", name); 144 cp -= sizeof(int); 145 nmlen = *(int*)cp; 146 slen = strlen(name) + 1; 147 if (nmlen != slen) 148 panic("Name length mismatch: was %d, now %d name '%s'", 149 nmlen, slen, name); 150 if (name[nmlen] != 0xfe) 151 panic("Last byte of name entry '%s' corrupted\n", name); 152 free(cp, M_SMBNODENAME); 153 #else 154 free(name, M_SMBNODENAME); 155 #endif 156 } 157 158 static int 159 smbfs_node_alloc(struct mount *mp, struct vnode *dvp, 160 const char *name, int nmlen, struct smbfattr *fap, struct vnode **vpp) 161 { 162 struct vattr vattr; 163 struct thread *td = curthread; /* XXX */ 164 struct smbmount *smp = VFSTOSMBFS(mp); 165 struct smbnode_hashhead *nhpp; 166 struct smbnode *np, *np2, *dnp; 167 struct vnode *vp; 168 u_long hashval; 169 int error; 170 171 *vpp = NULL; 172 if (smp->sm_root != NULL && dvp == NULL) { 173 SMBERROR("do not allocate root vnode twice!\n"); 174 return EINVAL; 175 } 176 if (nmlen == 2 && bcmp(name, "..", 2) == 0) { 177 if (dvp == NULL) 178 return EINVAL; 179 vp = VTOSMB(VTOSMB(dvp)->n_parent)->n_vnode; 180 error = vget(vp, LK_EXCLUSIVE, td); 181 if (error == 0) 182 *vpp = vp; 183 return error; 184 } else if (nmlen == 1 && name[0] == '.') { 185 SMBERROR("do not call me with dot!\n"); 186 return EINVAL; 187 } 188 dnp = dvp ? VTOSMB(dvp) : NULL; 189 if (dnp == NULL && dvp != NULL) { 190 vprint("smbfs_node_alloc: dead parent vnode", dvp); 191 return EINVAL; 192 } 193 hashval = smbfs_hash(name, nmlen); 194 retry: 195 smbfs_hash_lock(smp); 196 loop: 197 nhpp = SMBFS_NOHASH(smp, hashval); 198 LIST_FOREACH(np, nhpp, n_hash) { 199 vp = SMBTOV(np); 200 if (np->n_parent != dvp || 201 np->n_nmlen != nmlen || bcmp(name, np->n_name, nmlen) != 0) 202 continue; 203 VI_LOCK(vp); 204 smbfs_hash_unlock(smp); 205 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td) != 0) 206 goto retry; 207 /* Force cached attributes to be refreshed if stale. */ 208 (void)VOP_GETATTR(vp, &vattr, td->td_ucred); 209 /* 210 * If the file type on the server is inconsistent with 211 * what it was when we created the vnode, kill the 212 * bogus vnode now and fall through to the code below 213 * to create a new one with the right type. 214 */ 215 if ((vp->v_type == VDIR && (np->n_dosattr & SMB_FA_DIR) == 0) || 216 (vp->v_type == VREG && (np->n_dosattr & SMB_FA_DIR) != 0)) { 217 vgone(vp); 218 vput(vp); 219 break; 220 } 221 *vpp = vp; 222 return 0; 223 } 224 smbfs_hash_unlock(smp); 225 /* 226 * If we don't have node attributes, then it is an explicit lookup 227 * for an existing vnode. 228 */ 229 if (fap == NULL) 230 return ENOENT; 231 232 np = malloc(sizeof *np, M_SMBNODE, M_WAITOK); 233 error = getnewvnode("smbfs", mp, &smbfs_vnodeops, &vp); 234 if (error) { 235 free(np, M_SMBNODE); 236 return error; 237 } 238 error = insmntque(vp, mp); /* XXX: Too early for mpsafe fs */ 239 if (error != 0) { 240 free(np, M_SMBNODE); 241 return (error); 242 } 243 vp->v_type = fap->fa_attr & SMB_FA_DIR ? VDIR : VREG; 244 bzero(np, sizeof(*np)); 245 vp->v_data = np; 246 np->n_vnode = vp; 247 np->n_mount = VFSTOSMBFS(mp); 248 np->n_nmlen = nmlen; 249 np->n_name = smbfs_name_alloc(name, nmlen); 250 np->n_ino = fap->fa_ino; 251 252 if (dvp) { 253 ASSERT_VOP_LOCKED(dvp, "smbfs_node_alloc"); 254 np->n_parent = dvp; 255 if (/*vp->v_type == VDIR &&*/ (dvp->v_vflag & VV_ROOT) == 0) { 256 vref(dvp); 257 np->n_flag |= NREFPARENT; 258 } 259 } else if (vp->v_type == VREG) 260 SMBERROR("new vnode '%s' born without parent ?\n", np->n_name); 261 262 VN_LOCK_AREC(vp); 263 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 264 265 smbfs_hash_lock(smp); 266 LIST_FOREACH(np2, nhpp, n_hash) { 267 if (np2->n_parent != dvp || 268 np2->n_nmlen != nmlen || bcmp(name, np2->n_name, nmlen) != 0) 269 continue; 270 vput(vp); 271 /* smb_name_free(np->n_name); 272 free(np, M_SMBNODE);*/ 273 goto loop; 274 } 275 LIST_INSERT_HEAD(nhpp, np, n_hash); 276 smbfs_hash_unlock(smp); 277 *vpp = vp; 278 return 0; 279 } 280 281 int 282 smbfs_nget(struct mount *mp, struct vnode *dvp, const char *name, int nmlen, 283 struct smbfattr *fap, struct vnode **vpp) 284 { 285 struct smbnode *np; 286 struct vnode *vp; 287 int error; 288 289 *vpp = NULL; 290 error = smbfs_node_alloc(mp, dvp, name, nmlen, fap, &vp); 291 if (error) 292 return error; 293 np = VTOSMB(vp); 294 if (fap) 295 smbfs_attr_cacheenter(vp, fap); 296 *vpp = vp; 297 return 0; 298 } 299 300 /* 301 * Free smbnode, and give vnode back to system 302 */ 303 int 304 smbfs_reclaim(ap) 305 struct vop_reclaim_args /* { 306 struct vnode *a_vp; 307 struct thread *a_p; 308 } */ *ap; 309 { 310 struct vnode *vp = ap->a_vp; 311 struct vnode *dvp; 312 struct smbnode *np = VTOSMB(vp); 313 struct smbmount *smp = VTOSMBFS(vp); 314 315 SMBVDEBUG("%s,%d\n", np->n_name, vrefcnt(vp)); 316 317 KASSERT((np->n_flag & NOPEN) == 0, ("file not closed before reclaim")); 318 319 smbfs_hash_lock(smp); 320 /* 321 * Destroy the vm object and flush associated pages. 322 */ 323 vnode_destroy_vobject(vp); 324 325 dvp = (np->n_parent && (np->n_flag & NREFPARENT)) ? 326 np->n_parent : NULL; 327 328 if (np->n_hash.le_prev) 329 LIST_REMOVE(np, n_hash); 330 if (smp->sm_root == np) { 331 SMBVDEBUG("root vnode\n"); 332 smp->sm_root = NULL; 333 } 334 vp->v_data = NULL; 335 smbfs_hash_unlock(smp); 336 if (np->n_name) 337 smbfs_name_free(np->n_name); 338 free(np, M_SMBNODE); 339 if (dvp != NULL) { 340 vrele(dvp); 341 /* 342 * Indicate that we released something; see comment 343 * in smbfs_unmount(). 344 */ 345 smp->sm_didrele = 1; 346 } 347 return 0; 348 } 349 350 int 351 smbfs_inactive(ap) 352 struct vop_inactive_args /* { 353 struct vnode *a_vp; 354 struct thread *a_td; 355 } */ *ap; 356 { 357 struct thread *td = ap->a_td; 358 struct ucred *cred = td->td_ucred; 359 struct vnode *vp = ap->a_vp; 360 struct smbnode *np = VTOSMB(vp); 361 struct smb_cred scred; 362 struct vattr va; 363 364 SMBVDEBUG("%s: %d\n", VTOSMB(vp)->n_name, vrefcnt(vp)); 365 if ((np->n_flag & NOPEN) != 0) { 366 smb_makescred(&scred, td, cred); 367 smbfs_vinvalbuf(vp, td); 368 if (vp->v_type == VREG) { 369 VOP_GETATTR(vp, &va, cred); 370 smbfs_smb_close(np->n_mount->sm_share, np->n_fid, 371 &np->n_mtime, &scred); 372 } else if (vp->v_type == VDIR) { 373 if (np->n_dirseq != NULL) { 374 smbfs_findclose(np->n_dirseq, &scred); 375 np->n_dirseq = NULL; 376 } 377 } 378 np->n_flag &= ~NOPEN; 379 smbfs_attr_cacheremove(vp); 380 } 381 if (np->n_flag & NGONE) 382 vrecycle(vp, td); 383 return (0); 384 } 385 /* 386 * routines to maintain vnode attributes cache 387 * smbfs_attr_cacheenter: unpack np.i to vattr structure 388 */ 389 void 390 smbfs_attr_cacheenter(struct vnode *vp, struct smbfattr *fap) 391 { 392 struct smbnode *np = VTOSMB(vp); 393 394 if (vp->v_type == VREG) { 395 if (np->n_size != fap->fa_size) { 396 np->n_size = fap->fa_size; 397 vnode_pager_setsize(vp, np->n_size); 398 } 399 } else if (vp->v_type == VDIR) { 400 np->n_size = 16384; /* should be a better way ... */ 401 } else 402 return; 403 np->n_mtime = fap->fa_mtime; 404 np->n_dosattr = fap->fa_attr; 405 np->n_attrage = time_second; 406 return; 407 } 408 409 int 410 smbfs_attr_cachelookup(struct vnode *vp, struct vattr *va) 411 { 412 struct smbnode *np = VTOSMB(vp); 413 struct smbmount *smp = VTOSMBFS(vp); 414 int diff; 415 416 diff = time_second - np->n_attrage; 417 if (diff > 2) /* XXX should be configurable */ 418 return ENOENT; 419 va->va_type = vp->v_type; /* vnode type (for create) */ 420 if (vp->v_type == VREG) { 421 va->va_mode = smp->sm_file_mode; /* files access mode and type */ 422 if (np->n_dosattr & SMB_FA_RDONLY) 423 va->va_mode &= ~(S_IWUSR|S_IWGRP|S_IWOTH); 424 } else if (vp->v_type == VDIR) { 425 va->va_mode = smp->sm_dir_mode; /* files access mode and type */ 426 } else 427 return EINVAL; 428 va->va_size = np->n_size; 429 va->va_nlink = 1; /* number of references to file */ 430 va->va_uid = smp->sm_uid; /* owner user id */ 431 va->va_gid = smp->sm_gid; /* owner group id */ 432 va->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 433 va->va_fileid = np->n_ino; /* file id */ 434 if (va->va_fileid == 0) 435 va->va_fileid = 2; 436 va->va_blocksize = SSTOVC(smp->sm_share)->vc_txmax; 437 va->va_mtime = np->n_mtime; 438 va->va_atime = va->va_ctime = va->va_mtime; /* time file changed */ 439 va->va_gen = VNOVAL; /* generation number of file */ 440 va->va_flags = 0; /* flags defined for file */ 441 va->va_rdev = NODEV; /* device the special file represents */ 442 va->va_bytes = va->va_size; /* bytes of disk space held by file */ 443 va->va_filerev = 0; /* file modification number */ 444 va->va_vaflags = 0; /* operations flags */ 445 return 0; 446 }
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