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 * 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 * $FreeBSD$ 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/proc.h> 35 #include <sys/queue.h> 36 #include <sys/stat.h> 37 #include <sys/sx.h> 38 #include <sys/sysctl.h> 39 #include <sys/time.h> 40 #include <sys/vnode.h> 41 42 #include <netsmb/smb.h> 43 #include <netsmb/smb_conn.h> 44 #include <netsmb/smb_subr.h> 45 46 #include <vm/vm.h> 47 #include <vm/vm_extern.h> 48 /*#include <vm/vm_page.h> 49 #include <vm/vm_object.h>*/ 50 51 #include <fs/smbfs/smbfs.h> 52 #include <fs/smbfs/smbfs_node.h> 53 #include <fs/smbfs/smbfs_subr.h> 54 55 #define SMBFS_NOHASH(smp, hval) (&(smp)->sm_hash[(hval) & (smp)->sm_hashlen]) 56 #define smbfs_hash_lock(smp) sx_xlock(&smp->sm_hashlock) 57 #define smbfs_hash_unlock(smp) sx_xunlock(&smp->sm_hashlock) 58 59 extern struct vop_vector smbfs_vnodeops; /* XXX -> .h file */ 60 61 static MALLOC_DEFINE(M_SMBNODE, "smbufs_node", "SMBFS vnode private part"); 62 static MALLOC_DEFINE(M_SMBNODENAME, "smbufs_nname", "SMBFS node name"); 63 64 int smbfs_hashprint(struct mount *mp); 65 66 #if 0 67 #ifdef SYSCTL_DECL 68 SYSCTL_DECL(_vfs_smbfs); 69 #endif 70 SYSCTL_PROC(_vfs_smbfs, OID_AUTO, vnprint, CTLFLAG_WR|CTLTYPE_OPAQUE, 71 NULL, 0, smbfs_hashprint, "S,vnlist", "vnode hash"); 72 #endif 73 74 #define FNV_32_PRIME ((u_int32_t) 0x01000193UL) 75 #define FNV1_32_INIT ((u_int32_t) 33554467UL) 76 77 u_int32_t 78 smbfs_hash(const u_char *name, int nmlen) 79 { 80 u_int32_t v; 81 82 for (v = FNV1_32_INIT; nmlen; name++, nmlen--) { 83 v *= FNV_32_PRIME; 84 v ^= (u_int32_t)*name; 85 } 86 return v; 87 } 88 89 int 90 smbfs_hashprint(struct mount *mp) 91 { 92 struct smbmount *smp = VFSTOSMBFS(mp); 93 struct smbnode_hashhead *nhpp; 94 struct smbnode *np; 95 int i; 96 97 for(i = 0; i <= smp->sm_hashlen; i++) { 98 nhpp = &smp->sm_hash[i]; 99 LIST_FOREACH(np, nhpp, n_hash) 100 vprint("", SMBTOV(np)); 101 } 102 return 0; 103 } 104 105 static char * 106 smbfs_name_alloc(const u_char *name, int nmlen) 107 { 108 u_char *cp; 109 110 nmlen++; 111 #ifdef SMBFS_NAME_DEBUG 112 cp = malloc(nmlen + 2 + sizeof(int), M_SMBNODENAME, M_WAITOK); 113 *(int*)cp = nmlen; 114 cp += sizeof(int); 115 cp[0] = 0xfc; 116 cp++; 117 bcopy(name, cp, nmlen - 1); 118 cp[nmlen] = 0xfe; 119 #else 120 cp = malloc(nmlen, M_SMBNODENAME, M_WAITOK); 121 bcopy(name, cp, nmlen - 1); 122 #endif 123 cp[nmlen - 1] = 0; 124 return cp; 125 } 126 127 static void 128 smbfs_name_free(u_char *name) 129 { 130 #ifdef SMBFS_NAME_DEBUG 131 int nmlen, slen; 132 u_char *cp; 133 134 cp = name; 135 cp--; 136 if (*cp != 0xfc) 137 panic("First byte of name entry '%s' corrupted", name); 138 cp -= sizeof(int); 139 nmlen = *(int*)cp; 140 slen = strlen(name) + 1; 141 if (nmlen != slen) 142 panic("Name length mismatch: was %d, now %d name '%s'", 143 nmlen, slen, name); 144 if (name[nmlen] != 0xfe) 145 panic("Last byte of name entry '%s' corrupted\n", name); 146 free(cp, M_SMBNODENAME); 147 #else 148 free(name, M_SMBNODENAME); 149 #endif 150 } 151 152 static int 153 smbfs_node_alloc(struct mount *mp, struct vnode *dvp, 154 const char *name, int nmlen, struct smbfattr *fap, struct vnode **vpp) 155 { 156 struct vattr vattr; 157 struct thread *td = curthread; /* XXX */ 158 struct smbmount *smp = VFSTOSMBFS(mp); 159 struct smbnode_hashhead *nhpp; 160 struct smbnode *np, *np2, *dnp; 161 struct vnode *vp; 162 u_long hashval; 163 int error; 164 165 *vpp = NULL; 166 if (smp->sm_root != NULL && dvp == NULL) { 167 SMBERROR("do not allocate root vnode twice!\n"); 168 return EINVAL; 169 } 170 if (nmlen == 2 && bcmp(name, "..", 2) == 0) { 171 if (dvp == NULL) 172 return EINVAL; 173 vp = VTOSMB(VTOSMB(dvp)->n_parent)->n_vnode; 174 error = vget(vp, LK_EXCLUSIVE, td); 175 if (error == 0) 176 *vpp = vp; 177 return error; 178 } else if (nmlen == 1 && name[0] == '.') { 179 SMBERROR("do not call me with dot!\n"); 180 return EINVAL; 181 } 182 dnp = dvp ? VTOSMB(dvp) : NULL; 183 if (dnp == NULL && dvp != NULL) { 184 vprint("smbfs_node_alloc: dead parent vnode", dvp); 185 return EINVAL; 186 } 187 hashval = smbfs_hash(name, nmlen); 188 retry: 189 smbfs_hash_lock(smp); 190 loop: 191 nhpp = SMBFS_NOHASH(smp, hashval); 192 LIST_FOREACH(np, nhpp, n_hash) { 193 vp = SMBTOV(np); 194 if (np->n_parent != dvp || 195 np->n_nmlen != nmlen || bcmp(name, np->n_name, nmlen) != 0) 196 continue; 197 VI_LOCK(vp); 198 smbfs_hash_unlock(smp); 199 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td) != 0) 200 goto retry; 201 /* Force cached attributes to be refreshed if stale. */ 202 (void)VOP_GETATTR(vp, &vattr, td->td_ucred); 203 /* 204 * If the file type on the server is inconsistent with 205 * what it was when we created the vnode, kill the 206 * bogus vnode now and fall through to the code below 207 * to create a new one with the right type. 208 */ 209 if ((vp->v_type == VDIR && (np->n_dosattr & SMB_FA_DIR) == 0) || 210 (vp->v_type == VREG && (np->n_dosattr & SMB_FA_DIR) != 0)) { 211 vgone(vp); 212 vput(vp); 213 break; 214 } 215 *vpp = vp; 216 return 0; 217 } 218 smbfs_hash_unlock(smp); 219 /* 220 * If we don't have node attributes, then it is an explicit lookup 221 * for an existing vnode. 222 */ 223 if (fap == NULL) 224 return ENOENT; 225 226 np = malloc(sizeof *np, M_SMBNODE, M_WAITOK); 227 error = getnewvnode("smbfs", mp, &smbfs_vnodeops, &vp); 228 if (error) { 229 free(np, M_SMBNODE); 230 return error; 231 } 232 error = insmntque(vp, mp); /* XXX: Too early for mpsafe fs */ 233 if (error != 0) { 234 free(np, M_SMBNODE); 235 return (error); 236 } 237 vp->v_type = fap->fa_attr & SMB_FA_DIR ? VDIR : VREG; 238 bzero(np, sizeof(*np)); 239 vp->v_data = np; 240 np->n_vnode = vp; 241 np->n_mount = VFSTOSMBFS(mp); 242 np->n_nmlen = nmlen; 243 np->n_name = smbfs_name_alloc(name, nmlen); 244 np->n_ino = fap->fa_ino; 245 246 if (dvp) { 247 ASSERT_VOP_LOCKED(dvp, "smbfs_node_alloc"); 248 np->n_parent = dvp; 249 if (/*vp->v_type == VDIR &&*/ (dvp->v_vflag & VV_ROOT) == 0) { 250 vref(dvp); 251 np->n_flag |= NREFPARENT; 252 } 253 } else if (vp->v_type == VREG) 254 SMBERROR("new vnode '%s' born without parent ?\n", np->n_name); 255 256 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 257 VN_LOCK_AREC(vp); 258 259 smbfs_hash_lock(smp); 260 LIST_FOREACH(np2, nhpp, n_hash) { 261 if (np2->n_parent != dvp || 262 np2->n_nmlen != nmlen || bcmp(name, np2->n_name, nmlen) != 0) 263 continue; 264 vput(vp); 265 /* smb_name_free(np->n_name); 266 free(np, M_SMBNODE);*/ 267 goto loop; 268 } 269 LIST_INSERT_HEAD(nhpp, np, n_hash); 270 smbfs_hash_unlock(smp); 271 *vpp = vp; 272 return 0; 273 } 274 275 int 276 smbfs_nget(struct mount *mp, struct vnode *dvp, const char *name, int nmlen, 277 struct smbfattr *fap, struct vnode **vpp) 278 { 279 struct smbnode *np; 280 struct vnode *vp; 281 int error; 282 283 *vpp = NULL; 284 error = smbfs_node_alloc(mp, dvp, name, nmlen, fap, &vp); 285 if (error) 286 return error; 287 np = VTOSMB(vp); 288 if (fap) 289 smbfs_attr_cacheenter(vp, fap); 290 *vpp = vp; 291 return 0; 292 } 293 294 /* 295 * Free smbnode, and give vnode back to system 296 */ 297 int 298 smbfs_reclaim(ap) 299 struct vop_reclaim_args /* { 300 struct vnode *a_vp; 301 struct thread *a_p; 302 } */ *ap; 303 { 304 struct vnode *vp = ap->a_vp; 305 struct vnode *dvp; 306 struct smbnode *np = VTOSMB(vp); 307 struct smbmount *smp = VTOSMBFS(vp); 308 309 SMBVDEBUG("%s,%d\n", np->n_name, vrefcnt(vp)); 310 311 KASSERT((np->n_flag & NOPEN) == 0, ("file not closed before reclaim")); 312 313 smbfs_hash_lock(smp); 314 /* 315 * Destroy the vm object and flush associated pages. 316 */ 317 vnode_destroy_vobject(vp); 318 319 dvp = (np->n_parent && (np->n_flag & NREFPARENT)) ? 320 np->n_parent : NULL; 321 322 if (np->n_hash.le_prev) 323 LIST_REMOVE(np, n_hash); 324 if (smp->sm_root == np) { 325 SMBVDEBUG("root vnode\n"); 326 smp->sm_root = NULL; 327 } 328 vp->v_data = NULL; 329 smbfs_hash_unlock(smp); 330 if (np->n_name) 331 smbfs_name_free(np->n_name); 332 free(np, M_SMBNODE); 333 if (dvp != NULL) { 334 vrele(dvp); 335 /* 336 * Indicate that we released something; see comment 337 * in smbfs_unmount(). 338 */ 339 smp->sm_didrele = 1; 340 } 341 return 0; 342 } 343 344 int 345 smbfs_inactive(ap) 346 struct vop_inactive_args /* { 347 struct vnode *a_vp; 348 struct thread *a_td; 349 } */ *ap; 350 { 351 struct thread *td = ap->a_td; 352 struct ucred *cred = td->td_ucred; 353 struct vnode *vp = ap->a_vp; 354 struct smbnode *np = VTOSMB(vp); 355 struct smb_cred scred; 356 struct vattr va; 357 358 SMBVDEBUG("%s: %d\n", VTOSMB(vp)->n_name, vrefcnt(vp)); 359 if ((np->n_flag & NOPEN) != 0) { 360 smb_makescred(&scred, td, cred); 361 smbfs_vinvalbuf(vp, td); 362 if (vp->v_type == VREG) { 363 VOP_GETATTR(vp, &va, cred); 364 smbfs_smb_close(np->n_mount->sm_share, np->n_fid, 365 &np->n_mtime, &scred); 366 } else if (vp->v_type == VDIR) { 367 if (np->n_dirseq != NULL) { 368 smbfs_findclose(np->n_dirseq, &scred); 369 np->n_dirseq = NULL; 370 } 371 } 372 np->n_flag &= ~NOPEN; 373 smbfs_attr_cacheremove(vp); 374 } 375 if (np->n_flag & NGONE) 376 vrecycle(vp, td); 377 return (0); 378 } 379 /* 380 * routines to maintain vnode attributes cache 381 * smbfs_attr_cacheenter: unpack np.i to vattr structure 382 */ 383 void 384 smbfs_attr_cacheenter(struct vnode *vp, struct smbfattr *fap) 385 { 386 struct smbnode *np = VTOSMB(vp); 387 388 if (vp->v_type == VREG) { 389 if (np->n_size != fap->fa_size) { 390 np->n_size = fap->fa_size; 391 vnode_pager_setsize(vp, np->n_size); 392 } 393 } else if (vp->v_type == VDIR) { 394 np->n_size = 16384; /* should be a better way ... */ 395 } else 396 return; 397 np->n_mtime = fap->fa_mtime; 398 np->n_dosattr = fap->fa_attr; 399 np->n_attrage = time_second; 400 return; 401 } 402 403 int 404 smbfs_attr_cachelookup(struct vnode *vp, struct vattr *va) 405 { 406 struct smbnode *np = VTOSMB(vp); 407 struct smbmount *smp = VTOSMBFS(vp); 408 int diff; 409 410 diff = time_second - np->n_attrage; 411 if (diff > 2) /* XXX should be configurable */ 412 return ENOENT; 413 va->va_type = vp->v_type; /* vnode type (for create) */ 414 if (vp->v_type == VREG) { 415 va->va_mode = smp->sm_file_mode; /* files access mode and type */ 416 if (np->n_dosattr & SMB_FA_RDONLY) 417 va->va_mode &= ~(S_IWUSR|S_IWGRP|S_IWOTH); 418 } else if (vp->v_type == VDIR) { 419 va->va_mode = smp->sm_dir_mode; /* files access mode and type */ 420 } else 421 return EINVAL; 422 va->va_size = np->n_size; 423 va->va_nlink = 1; /* number of references to file */ 424 va->va_uid = smp->sm_uid; /* owner user id */ 425 va->va_gid = smp->sm_gid; /* owner group id */ 426 va->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 427 va->va_fileid = np->n_ino; /* file id */ 428 if (va->va_fileid == 0) 429 va->va_fileid = 2; 430 va->va_blocksize = SSTOVC(smp->sm_share)->vc_txmax; 431 va->va_mtime = np->n_mtime; 432 va->va_atime = va->va_ctime = va->va_mtime; /* time file changed */ 433 va->va_gen = VNOVAL; /* generation number of file */ 434 va->va_flags = 0; /* flags defined for file */ 435 va->va_rdev = NODEV; /* device the special file represents */ 436 va->va_bytes = va->va_size; /* bytes of disk space held by file */ 437 va->va_filerev = 0; /* file modification number */ 438 va->va_vaflags = 0; /* operations flags */ 439 return 0; 440 }
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