subr.c revision 1.17
1 /* $NetBSD: subr.c,v 1.17 2007/05/15 14:17:30 pooka Exp $ */ 2 3 /* 4 * Copyright (c) 2006 Antti Kantee. All Rights Reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the company nor the name of the author may be used to 15 * endorse or promote products derived from this software without specific 16 * prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 19 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 21 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 #ifndef lint 33 __RCSID("$NetBSD: subr.c,v 1.17 2007/05/15 14:17:30 pooka Exp $"); 34 #endif /* !lint */ 35 36 #include <assert.h> 37 #include <errno.h> 38 #include <puffs.h> 39 #include <stdlib.h> 40 #include <util.h> 41 42 #include "psshfs.h" 43 #include "sftp_proto.h" 44 45 static void 46 freedircache(struct psshfs_dir *base, size_t count) 47 { 48 int i; 49 50 for (i = 0; i < count; i++) { 51 free(base[i].entryname); 52 base[i].entryname = NULL; 53 } 54 55 free(base); 56 } 57 58 #define ENTRYCHUNK 16 59 static void 60 allocdirs(struct psshfs_node *psn) 61 { 62 size_t oldtot = psn->denttot; 63 64 psn->denttot += ENTRYCHUNK; 65 psn->dir = erealloc(psn->dir, 66 psn->denttot * sizeof(struct psshfs_dir)); 67 memset(psn->dir + oldtot, 0, ENTRYCHUNK * sizeof(struct psshfs_dir)); 68 } 69 70 struct psshfs_dir * 71 lookup(struct psshfs_dir *bdir, size_t ndir, const char *name) 72 { 73 struct psshfs_dir *test; 74 int i; 75 76 for (i = 0; i < ndir; i++) { 77 test = &bdir[i]; 78 if (test->valid != 1) 79 continue; 80 if (strcmp(test->entryname, name) == 0) 81 return test; 82 } 83 84 return NULL; 85 } 86 87 static struct psshfs_dir * 88 lookup_by_entry(struct psshfs_dir *bdir, size_t ndir, struct puffs_node *entry) 89 { 90 struct psshfs_dir *test; 91 int i; 92 93 for (i = 0; i < ndir; i++) { 94 test = &bdir[i]; 95 if (test->valid != 1) 96 continue; 97 if (test->entry == entry) 98 return test; 99 } 100 101 return NULL; 102 } 103 104 #ifdef SUPERREADDIR 105 struct readdirattr { 106 struct psshfs_node *psn; 107 int idx; 108 char entryname[MAXPATHLEN+1]; 109 }; 110 111 static void 112 readdir_getattr_resp(struct puffs_usermount *pu, 113 struct puffs_framebuf *pb, void *arg) 114 { 115 struct readdirattr *rda = arg; 116 struct psshfs_node *psn = rda->psn; 117 struct psshfs_dir *pdir; 118 struct vattr va; 119 120 pdir = lookup(psn->dir, psn->denttot, rda->entryname); 121 if (!pdir) 122 goto out; 123 124 if (psbuf_expect_attrs(pb, &va)) 125 goto out; 126 127 if (pdir->entry) { 128 struct psshfs_node *psn_targ; 129 psn_targ = pdir->entry->pn_data; 130 131 puffs_setvattr(&pdir->entry->pn_va, &va); 132 psn_targ->attrread = time(NULL); 133 } else { 134 puffs_setvattr(&pdir->va, &va); 135 pdir->attrread = time(NULL); 136 } 137 138 out: 139 free(rda); 140 puffs_framebuf_destroy(pb); 141 } 142 143 static int 144 readdir_getattr(struct puffs_usermount *pu, struct psshfs_node *psn, 145 const char *basepath, int idx) 146 { 147 char path[MAXPATHLEN+1]; 148 struct psshfs_ctx *pctx = puffs_getspecific(pu); 149 struct psshfs_dir *pdir = psn->dir; 150 struct puffs_framebuf *pb; 151 struct readdirattr *rda; 152 const char *entryname = pdir[idx].entryname; 153 uint32_t reqid = NEXTREQ(pctx); 154 int rv = 0; 155 156 rda = emalloc(sizeof(struct readdirattr)); 157 rda->psn = psn; 158 rda->idx = idx; 159 strlcpy(rda->entryname, entryname, sizeof(rda->entryname)); 160 161 strcpy(path, basepath); 162 strcat(path, "/"); 163 strlcat(path, entryname, sizeof(path)); 164 165 pb = psbuf_makeout(); 166 psbuf_req_str(pb, SSH_FXP_LSTAT, reqid, path); 167 SENDCB(pb, readdir_getattr_resp, rda); 168 169 out: 170 return rv; 171 } 172 #endif 173 174 int 175 getpathattr(struct puffs_cc *pcc, const char *path, struct vattr *vap) 176 { 177 PSSHFSAUTOVAR(pcc); 178 179 psbuf_req_str(pb, SSH_FXP_LSTAT, reqid, path); 180 GETRESPONSE(pb); 181 182 rv = psbuf_expect_attrs(pb, vap); 183 184 out: 185 PSSHFSRETURN(rv); 186 } 187 188 int 189 getnodeattr(struct puffs_cc *pcc, struct puffs_node *pn) 190 { 191 struct puffs_usermount *pu = puffs_cc_getusermount(pcc); 192 struct psshfs_node *psn = pn->pn_data; 193 struct vattr va; 194 int rv; 195 196 if ((time(NULL) - psn->attrread) >= PSSHFS_REFRESHIVAL) { 197 rv = getpathattr(pcc, PNPATH(pn), &va); 198 if (rv) 199 return rv; 200 201 /* 202 * Check if the file was modified from below us. If 203 * so, invalidate page cache. This is the only sensible 204 * place we can do this in. 205 */ 206 if (psn->attrread) 207 if (pn->pn_va.va_mtime.tv_sec != va.va_mtime.tv_sec) 208 puffs_inval_pagecache_node(pu, pn); 209 210 puffs_setvattr(&pn->pn_va, &va); 211 psn->attrread = time(NULL); 212 } 213 214 return 0; 215 } 216 217 int 218 sftp_readdir(struct puffs_cc *pcc, struct psshfs_ctx *pctx, 219 struct puffs_node *pn) 220 { 221 struct puffs_usermount *pu = puffs_cc_getusermount(pcc); 222 struct psshfs_node *psn = pn->pn_data; 223 struct psshfs_dir *olddir, *testd; 224 struct puffs_framebuf *pb; 225 uint32_t reqid = NEXTREQ(pctx); 226 uint32_t count, dhandlen; 227 char *dhand = NULL; 228 size_t nent; 229 char *longname; 230 int idx, rv; 231 232 assert(pn->pn_va.va_type == VDIR); 233 idx = 0; 234 olddir = psn->dir; 235 nent = psn->dentnext; 236 237 if (psn->dir && (time(NULL) - psn->dentread) < PSSHFS_REFRESHIVAL) 238 return 0; 239 240 puffs_inval_namecache_dir(puffs_cc_getusermount(pcc), pn); 241 242 pb = psbuf_makeout(); 243 psbuf_req_str(pb, SSH_FXP_OPENDIR, reqid, PNPATH(pn)); 244 GETRESPONSE(pb); 245 246 rv = psbuf_expect_handle(pb, &dhand, &dhandlen); 247 if (rv) 248 goto wayout; 249 250 /* 251 * Well, the following is O(n^2), so feel free to improve if it 252 * gets too taxing on your system. 253 */ 254 255 /* 256 * note: for the "getattr in batch" to work, this must be before 257 * the attribute-getting. Otherwise times for first entries in 258 * large directories might expire before the directory itself and 259 * result in one-by-one attribute fetching. 260 */ 261 psn->dentread = time(NULL); 262 263 psn->dentnext = 0; 264 psn->denttot = 0; 265 psn->dir = NULL; 266 267 for (;;) { 268 reqid = NEXTREQ(pctx); 269 psbuf_recycleout(pb); 270 psbuf_req_data(pb, SSH_FXP_READDIR, reqid, dhand, dhandlen); 271 GETRESPONSE(pb); 272 273 /* check for EOF */ 274 if (psbuf_get_type(pb) == SSH_FXP_STATUS) { 275 rv = psbuf_expect_status(pb); 276 goto out; 277 } 278 rv = psbuf_expect_name(pb, &count); 279 if (rv) 280 goto out; 281 282 for (; count--; idx++) { 283 if (idx == psn->denttot) 284 allocdirs(psn); 285 if ((rv = psbuf_get_str(pb, 286 &psn->dir[idx].entryname, NULL))) 287 goto out; 288 if ((rv = psbuf_get_str(pb, &longname, NULL))) 289 goto out; 290 if ((rv = psbuf_get_vattr(pb, &psn->dir[idx].va))) { 291 free(longname); 292 goto out; 293 } 294 if (sscanf(longname, "%*s%d", 295 &psn->dir[idx].va.va_nlink) != 1) { 296 rv = EPROTO; 297 goto out; 298 } 299 free(longname); 300 301 testd = lookup(olddir, nent, psn->dir[idx].entryname); 302 if (testd) { 303 psn->dir[idx].entry = testd->entry; 304 psn->dir[idx].va = testd->va; 305 } else { 306 psn->dir[idx].entry = NULL; 307 psn->dir[idx].va.va_fileid = pctx->nextino++; 308 } 309 #ifdef SUPERREADDIR 310 /* 311 * XXX: there's a dangling pointer race here if 312 * the server responds to our queries out-of-order. 313 * fixxxme some day 314 */ 315 rv = readdir_getattr(puffs_cc_getusermount(pcc), 316 psn, PNPATH(pn), idx); 317 if (rv) 318 goto out; 319 #endif 320 psn->dir[idx].valid = 1; 321 } 322 } 323 324 out: 325 /* XXX: rv */ 326 psn->dentnext = idx; 327 freedircache(olddir, nent); 328 329 reqid = NEXTREQ(pctx); 330 psbuf_recycleout(pb); 331 psbuf_req_data(pb, SSH_FXP_CLOSE, reqid, dhand, dhandlen); 332 333 JUSTSEND(pb); 334 free(dhand); 335 return rv; 336 337 wayout: 338 free(dhand); 339 PSSHFSRETURN(rv); 340 } 341 342 struct puffs_node * 343 makenode(struct puffs_usermount *pu, struct puffs_node *parent, 344 struct psshfs_dir *pd, const struct vattr *vap) 345 { 346 struct psshfs_node *psn_parent = parent->pn_data; 347 struct psshfs_node *psn; 348 struct puffs_node *pn; 349 350 psn = emalloc(sizeof(struct psshfs_node)); 351 memset(psn, 0, sizeof(struct psshfs_node)); 352 353 pn = puffs_pn_new(pu, psn); 354 if (!pn) { 355 free(psn); 356 return NULL; 357 } 358 puffs_setvattr(&pn->pn_va, &pd->va); 359 psn->attrread = pd->attrread; 360 puffs_setvattr(&pn->pn_va, vap); 361 362 pd->entry = pn; 363 psn->parent = parent; 364 psn_parent->childcount++; 365 366 return pn; 367 } 368 369 struct puffs_node * 370 allocnode(struct puffs_usermount *pu, struct puffs_node *parent, 371 const char *entryname, const struct vattr *vap) 372 { 373 struct psshfs_ctx *pctx = puffs_getspecific(pu); 374 struct psshfs_dir *pd; 375 struct puffs_node *pn; 376 377 pd = direnter(parent, entryname); 378 379 pd->va.va_fileid = pctx->nextino++; 380 if (vap->va_type == VDIR) { 381 pd->va.va_nlink = 2; 382 parent->pn_va.va_nlink++; 383 } else { 384 pd->va.va_nlink = 1; 385 } 386 387 pn = makenode(pu, parent, pd, vap); 388 if (pn) 389 pd->va.va_fileid = pn->pn_va.va_fileid; 390 391 return pn; 392 } 393 394 struct psshfs_dir * 395 direnter(struct puffs_node *parent, const char *entryname) 396 { 397 struct psshfs_node *psn_parent = parent->pn_data; 398 struct psshfs_dir *pd; 399 int i; 400 401 /* create directory entry */ 402 if (psn_parent->denttot == psn_parent->dentnext) 403 allocdirs(psn_parent); 404 405 i = psn_parent->dentnext; 406 pd = &psn_parent->dir[i]; 407 pd->entryname = estrdup(entryname); 408 pd->valid = 1; 409 pd->attrread = 0; 410 puffs_vattr_null(&pd->va); 411 psn_parent->dentnext++; 412 413 return pd; 414 } 415 416 void 417 doreclaim(struct puffs_node *pn) 418 { 419 struct psshfs_node *psn = pn->pn_data; 420 struct psshfs_node *psn_parent; 421 struct psshfs_dir *dent; 422 423 psn_parent = psn->parent->pn_data; 424 psn_parent->childcount--; 425 426 /* 427 * Null out entry from directory. Do not treat a missing entry 428 * as an invariant error, since the node might be removed from 429 * under us, and we might do a readdir before the reclaim resulting 430 * in no directory entry in the parent directory. 431 */ 432 dent = lookup_by_entry(psn_parent->dir, psn_parent->dentnext, pn); 433 if (dent) 434 dent->entry = NULL; 435 436 if (pn->pn_va.va_type == VDIR) 437 freedircache(psn->dir, psn->dentnext); 438 439 puffs_pn_put(pn); 440 } 441 442 void 443 nukenode(struct puffs_node *node, const char *entryname, int reclaim) 444 { 445 struct psshfs_node *psn, *psn_parent; 446 struct psshfs_dir *pd; 447 448 psn = node->pn_data; 449 psn_parent = psn->parent->pn_data; 450 pd = lookup(psn_parent->dir, psn_parent->dentnext, entryname); 451 assert(pd != NULL); 452 pd->valid = 0; 453 free(pd->entryname); 454 pd->entryname = NULL; 455 456 if (node->pn_va.va_type == VDIR) 457 psn->parent->pn_va.va_nlink--; 458 459 if (reclaim) 460 doreclaim(node); 461 } 462
Indexes created Tue Sep 23 21:09:50 GMT 2025