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/fnv_hash.h> 31 #include <sys/kernel.h> 32 #include <sys/lock.h> 33 #include <sys/malloc.h> 34 #include <sys/mount.h> 35 #include <sys/proc.h> 36 #include <sys/queue.h> 37 #include <sys/stat.h> 38 #include <sys/sx.h> 39 #include <sys/sysctl.h> 40 #include <sys/time.h> 41 #include <sys/vnode.h> 42 43 #include <netsmb/smb.h> 44 #include <netsmb/smb_conn.h> 45 #include <netsmb/smb_subr.h> 46 47 #include <vm/vm.h> 48 #include <vm/vm_extern.h> 49 /*#include <vm/vm_page.h> 50 #include <vm/vm_object.h>*/ 51 52 #include <fs/smbfs/smbfs.h> 53 #include <fs/smbfs/smbfs_node.h> 54 #include <fs/smbfs/smbfs_subr.h> 55 56 extern struct vop_vector smbfs_vnodeops; /* XXX -> .h file */ 57 58 static MALLOC_DEFINE(M_SMBNODE, "smbufs_node", "SMBFS vnode private part"); 59 static MALLOC_DEFINE(M_SMBNODENAME, "smbufs_nname", "SMBFS node name"); 60 61 u_int32_t __inline 62 smbfs_hash(const u_char *name, int nmlen) 63 { 64 return (fnv_32_buf(name, nmlen, FNV1_32_INIT)); 65 } 66 67 static char * 68 smbfs_name_alloc(const u_char *name, int nmlen) 69 { 70 u_char *cp; 71 72 nmlen++; 73 cp = malloc(nmlen, M_SMBNODENAME, M_WAITOK); 74 bcopy(name, cp, nmlen - 1); 75 cp[nmlen - 1] = 0; 76 return cp; 77 } 78 79 static void 80 smbfs_name_free(u_char *name) 81 { 82 83 free(name, M_SMBNODENAME); 84 } 85 86 static int __inline 87 smbfs_vnode_cmp(struct vnode *vp, void *_sc) 88 { 89 struct smbnode *np; 90 struct smbcmp *sc; 91 92 np = (struct smbnode *) vp->v_data; 93 sc = (struct smbcmp *) _sc; 94 if (np->n_parent != sc->n_parent || np->n_nmlen != sc->n_nmlen || 95 bcmp(sc->n_name, np->n_name, sc->n_nmlen) != 0) 96 return 1; 97 return 0; 98 } 99 100 static int 101 smbfs_node_alloc(struct mount *mp, struct vnode *dvp, const char *dirnm, 102 int dirlen, const char *name, int nmlen, char sep, 103 struct smbfattr *fap, struct vnode **vpp) 104 { 105 struct vattr vattr; 106 struct thread *td = curthread; /* XXX */ 107 struct smbmount *smp = VFSTOSMBFS(mp); 108 struct smbnode *np, *dnp; 109 struct vnode *vp, *vp2; 110 struct smbcmp sc; 111 char *p, *rpath; 112 int error, rplen; 113 114 sc.n_parent = dvp; 115 sc.n_nmlen = nmlen; 116 sc.n_name = name; 117 if (smp->sm_root != NULL && dvp == NULL) { 118 SMBERROR("do not allocate root vnode twice!\n"); 119 return EINVAL; 120 } 121 if (nmlen == 2 && bcmp(name, "..", 2) == 0) { 122 if (dvp == NULL) 123 return EINVAL; 124 vp = VTOSMB(VTOSMB(dvp)->n_parent)->n_vnode; 125 error = vget(vp, LK_EXCLUSIVE, td); 126 if (error == 0) 127 *vpp = vp; 128 return error; 129 } else if (nmlen == 1 && name[0] == '.') { 130 SMBERROR("do not call me with dot!\n"); 131 return EINVAL; 132 } 133 dnp = dvp ? VTOSMB(dvp) : NULL; 134 if (dnp == NULL && dvp != NULL) { 135 vprint("smbfs_node_alloc: dead parent vnode", dvp); 136 return EINVAL; 137 } 138 error = vfs_hash_get(mp, smbfs_hash(name, nmlen), LK_EXCLUSIVE, td, 139 vpp, smbfs_vnode_cmp, &sc); 140 if (error) 141 return (error); 142 if (*vpp) { 143 np = VTOSMB(*vpp); 144 /* Force cached attributes to be refreshed if stale. */ 145 (void)VOP_GETATTR(*vpp, &vattr, td->td_ucred); 146 /* 147 * If the file type on the server is inconsistent with 148 * what it was when we created the vnode, kill the 149 * bogus vnode now and fall through to the code below 150 * to create a new one with the right type. 151 */ 152 if (((*vpp)->v_type == VDIR && 153 (np->n_dosattr & SMB_FA_DIR) == 0) || 154 ((*vpp)->v_type == VREG && 155 (np->n_dosattr & SMB_FA_DIR) != 0)) { 156 vgone(*vpp); 157 vput(*vpp); 158 } 159 else { 160 SMBVDEBUG("vnode taken from the hashtable\n"); 161 return (0); 162 } 163 } 164 /* 165 * If we don't have node attributes, then it is an explicit lookup 166 * for an existing vnode. 167 */ 168 if (fap == NULL) 169 return ENOENT; 170 171 error = getnewvnode("smbfs", mp, &smbfs_vnodeops, vpp); 172 if (error) 173 return (error); 174 vp = *vpp; 175 np = malloc(sizeof *np, M_SMBNODE, M_WAITOK | M_ZERO); 176 rplen = dirlen; 177 if (sep != '\0') 178 rplen++; 179 rplen += nmlen; 180 rpath = malloc(rplen + 1, M_SMBNODENAME, M_WAITOK); 181 p = rpath; 182 bcopy(dirnm, p, dirlen); 183 p += dirlen; 184 if (sep != '\0') 185 *p++ = sep; 186 if (name != NULL) { 187 bcopy(name, p, nmlen); 188 p += nmlen; 189 } 190 *p = '\0'; 191 MPASS(p == rpath + rplen); 192 lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL); 193 /* Vnode initialization */ 194 vp->v_type = fap->fa_attr & SMB_FA_DIR ? VDIR : VREG; 195 vp->v_data = np; 196 np->n_vnode = vp; 197 np->n_mount = VFSTOSMBFS(mp); 198 np->n_rpath = rpath; 199 np->n_rplen = rplen; 200 np->n_nmlen = nmlen; 201 np->n_name = smbfs_name_alloc(name, nmlen); 202 np->n_ino = fap->fa_ino; 203 if (dvp) { 204 ASSERT_VOP_LOCKED(dvp, "smbfs_node_alloc"); 205 np->n_parent = dvp; 206 np->n_parentino = VTOSMB(dvp)->n_ino; 207 if (/*vp->v_type == VDIR &&*/ (dvp->v_vflag & VV_ROOT) == 0) { 208 vref(dvp); 209 np->n_flag |= NREFPARENT; 210 } 211 } else if (vp->v_type == VREG) 212 SMBERROR("new vnode '%s' born without parent ?\n", np->n_name); 213 error = insmntque(vp, mp); 214 if (error) { 215 free(np, M_SMBNODE); 216 return (error); 217 } 218 error = vfs_hash_insert(vp, smbfs_hash(name, nmlen), LK_EXCLUSIVE, 219 td, &vp2, smbfs_vnode_cmp, &sc); 220 if (error) 221 return (error); 222 if (vp2 != NULL) 223 *vpp = vp2; 224 return (0); 225 } 226 227 int 228 smbfs_nget(struct mount *mp, struct vnode *dvp, const char *name, int nmlen, 229 struct smbfattr *fap, struct vnode **vpp) 230 { 231 struct smbnode *dnp, *np; 232 struct vnode *vp; 233 int error, sep; 234 235 dnp = (dvp) ? VTOSMB(dvp) : NULL; 236 sep = 0; 237 if (dnp != NULL) { 238 sep = SMBFS_DNP_SEP(dnp); 239 error = smbfs_node_alloc(mp, dvp, dnp->n_rpath, dnp->n_rplen, 240 name, nmlen, sep, fap, &vp); 241 } else 242 error = smbfs_node_alloc(mp, NULL, "\\", 1, name, nmlen, 243 sep, fap, &vp); 244 if (error) 245 return error; 246 MPASS(vp != NULL); 247 np = VTOSMB(vp); 248 if (fap) 249 smbfs_attr_cacheenter(vp, fap); 250 *vpp = vp; 251 return 0; 252 } 253 254 /* 255 * Free smbnode, and give vnode back to system 256 */ 257 int 258 smbfs_reclaim(ap) 259 struct vop_reclaim_args /* { 260 struct vnode *a_vp; 261 struct thread *a_p; 262 } */ *ap; 263 { 264 struct vnode *vp = ap->a_vp; 265 struct vnode *dvp; 266 struct smbnode *np = VTOSMB(vp); 267 struct smbmount *smp = VTOSMBFS(vp); 268 269 SMBVDEBUG("%s,%d\n", np->n_name, vrefcnt(vp)); 270 271 KASSERT((np->n_flag & NOPEN) == 0, ("file not closed before reclaim")); 272 273 /* 274 * Destroy the vm object and flush associated pages. 275 */ 276 vnode_destroy_vobject(vp); 277 dvp = (np->n_parent && (np->n_flag & NREFPARENT)) ? 278 np->n_parent : NULL; 279 280 /* 281 * Remove the vnode from its hash chain. 282 */ 283 vfs_hash_remove(vp); 284 if (np->n_name) 285 smbfs_name_free(np->n_name); 286 if (np->n_rpath) 287 free(np->n_rpath, M_SMBNODENAME); 288 free(np, M_SMBNODE); 289 vp->v_data = NULL; 290 if (dvp != NULL) { 291 vrele(dvp); 292 /* 293 * Indicate that we released something; see comment 294 * in smbfs_unmount(). 295 */ 296 smp->sm_didrele = 1; 297 } 298 return 0; 299 } 300 301 int 302 smbfs_inactive(ap) 303 struct vop_inactive_args /* { 304 struct vnode *a_vp; 305 struct thread *a_td; 306 } */ *ap; 307 { 308 struct thread *td = ap->a_td; 309 struct ucred *cred = td->td_ucred; 310 struct vnode *vp = ap->a_vp; 311 struct smbnode *np = VTOSMB(vp); 312 struct smb_cred *scred; 313 struct vattr va; 314 315 SMBVDEBUG("%s: %d\n", VTOSMB(vp)->n_name, vrefcnt(vp)); 316 if ((np->n_flag & NOPEN) != 0) { 317 scred = smbfs_malloc_scred(); 318 smb_makescred(scred, td, cred); 319 smbfs_vinvalbuf(vp, td); 320 if (vp->v_type == VREG) { 321 VOP_GETATTR(vp, &va, cred); 322 smbfs_smb_close(np->n_mount->sm_share, np->n_fid, 323 &np->n_mtime, scred); 324 } else if (vp->v_type == VDIR) { 325 if (np->n_dirseq != NULL) { 326 smbfs_findclose(np->n_dirseq, scred); 327 np->n_dirseq = NULL; 328 } 329 } 330 np->n_flag &= ~NOPEN; 331 smbfs_attr_cacheremove(vp); 332 smbfs_free_scred(scred); 333 } 334 if (np->n_flag & NGONE) 335 vrecycle(vp); 336 return (0); 337 } 338 /* 339 * routines to maintain vnode attributes cache 340 * smbfs_attr_cacheenter: unpack np.i to vattr structure 341 */ 342 void 343 smbfs_attr_cacheenter(struct vnode *vp, struct smbfattr *fap) 344 { 345 struct smbnode *np = VTOSMB(vp); 346 347 if (vp->v_type == VREG) { 348 if (np->n_size != fap->fa_size) { 349 np->n_size = fap->fa_size; 350 vnode_pager_setsize(vp, np->n_size); 351 } 352 } else if (vp->v_type == VDIR) { 353 np->n_size = 16384; /* should be a better way ... */ 354 } else 355 return; 356 np->n_mtime = fap->fa_mtime; 357 np->n_dosattr = fap->fa_attr; 358 np->n_attrage = time_second; 359 return; 360 } 361 362 int 363 smbfs_attr_cachelookup(struct vnode *vp, struct vattr *va) 364 { 365 struct smbnode *np = VTOSMB(vp); 366 struct smbmount *smp = VTOSMBFS(vp); 367 int diff; 368 369 diff = time_second - np->n_attrage; 370 if (diff > 2) /* XXX should be configurable */ 371 return ENOENT; 372 va->va_type = vp->v_type; /* vnode type (for create) */ 373 va->va_flags = 0; /* flags defined for file */ 374 if (vp->v_type == VREG) { 375 va->va_mode = smp->sm_file_mode; /* files access mode and type */ 376 if (np->n_dosattr & SMB_FA_RDONLY) { 377 va->va_mode &= ~(S_IWUSR|S_IWGRP|S_IWOTH); 378 va->va_flags |= UF_READONLY; 379 } 380 } else if (vp->v_type == VDIR) { 381 va->va_mode = smp->sm_dir_mode; /* files access mode and type */ 382 } else 383 return EINVAL; 384 va->va_size = np->n_size; 385 va->va_nlink = 1; /* number of references to file */ 386 va->va_uid = smp->sm_uid; /* owner user id */ 387 va->va_gid = smp->sm_gid; /* owner group id */ 388 va->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 389 va->va_fileid = np->n_ino; /* file id */ 390 if (va->va_fileid == 0) 391 va->va_fileid = 2; 392 va->va_blocksize = SSTOVC(smp->sm_share)->vc_txmax; 393 va->va_mtime = np->n_mtime; 394 va->va_atime = va->va_ctime = va->va_mtime; /* time file changed */ 395 va->va_gen = VNOVAL; /* generation number of file */ 396 if (np->n_dosattr & SMB_FA_HIDDEN) 397 va->va_flags |= UF_HIDDEN; 398 if (np->n_dosattr & SMB_FA_SYSTEM) 399 va->va_flags |= UF_SYSTEM; 400 /* 401 * We don't set the archive bit for directories. 402 */ 403 if ((vp->v_type != VDIR) && (np->n_dosattr & SMB_FA_ARCHIVE)) 404 va->va_flags |= UF_ARCHIVE; 405 va->va_rdev = NODEV; /* device the special file represents */ 406 va->va_bytes = va->va_size; /* bytes of disk space held by file */ 407 va->va_filerev = 0; /* file modification number */ 408 va->va_vaflags = 0; /* operations flags */ 409 return 0; 410 }
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