subr.c revision 1.14
1 /* $NetBSD: subr.c,v 1.14 2007/05/05 15:49:51 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 1.14 2007/05/05 15:49:51 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 void 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); 154 155 rda = emalloc(sizeof(struct readdirattr)); 156 rda->psn = psn; 157 rda->idx = idx; 158 strlcpy(rda->entryname, entryname, sizeof(rda->entryname)); 159 160 strcpy(path, basepath); 161 strcat(path, "/"); 162 strlcat(path, entryname, sizeof(path)); 163 164 pb = psbuf_makeout(); 165 psbuf_req_str(pb, SSH_FXP_LSTAT, reqid, path); 166 puffs_framebuf_enqueue_cb(pu, pb, readdir_getattr_resp, rda); 167 } 168 #endif 169 170 int 171 getpathattr(struct puffs_cc *pcc, const char *path, struct vattr *vap) 172 { 173 PSSHFSAUTOVAR(pcc); 174 175 psbuf_req_str(pb, SSH_FXP_LSTAT, reqid, path); 176 puffs_framebuf_enqueue_cc(pcc, pb); 177 178 rv = psbuf_expect_attrs(pb, vap); 179 180 PSSHFSRETURN(rv); 181 } 182 183 int 184 getnodeattr(struct puffs_cc *pcc, struct puffs_node *pn) 185 { 186 struct puffs_usermount *pu = puffs_cc_getusermount(pcc); 187 struct psshfs_node *psn = pn->pn_data; 188 struct vattr va; 189 int rv; 190 191 if ((time(NULL) - psn->attrread) >= PSSHFS_REFRESHIVAL) { 192 rv = getpathattr(pcc, PNPATH(pn), &va); 193 if (rv) 194 return rv; 195 196 /* 197 * Check if the file was modified from below us. If 198 * so, invalidate page cache. This is the only sensible 199 * place we can do this in. 200 */ 201 if (psn->attrread) 202 if (pn->pn_va.va_mtime.tv_sec != va.va_mtime.tv_sec) 203 puffs_inval_pagecache_node(pu, pn); 204 205 puffs_setvattr(&pn->pn_va, &va); 206 psn->attrread = time(NULL); 207 } 208 209 return 0; 210 } 211 212 int 213 sftp_readdir(struct puffs_cc *pcc, struct psshfs_ctx *pctx, 214 struct puffs_node *pn) 215 { 216 struct psshfs_node *psn = pn->pn_data; 217 struct psshfs_dir *olddir, *testd; 218 struct puffs_framebuf *pb; 219 uint32_t reqid = NEXTREQ(pctx); 220 uint32_t count, dhandlen; 221 char *dhand = NULL; 222 size_t nent; 223 char *longname; 224 int idx, rv; 225 226 assert(pn->pn_va.va_type == VDIR); 227 228 if (psn->dir && (time(NULL) - psn->dentread) < PSSHFS_REFRESHIVAL) 229 return 0; 230 231 puffs_inval_namecache_dir(puffs_cc_getusermount(pcc), pn); 232 233 pb = psbuf_makeout(); 234 psbuf_req_str(pb, SSH_FXP_OPENDIR, reqid, PNPATH(pn)); 235 puffs_framebuf_enqueue_cc(pcc, pb); 236 237 rv = psbuf_expect_handle(pb, &dhand, &dhandlen); 238 if (rv) 239 goto wayout; 240 241 /* 242 * Well, the following is O(n^2), so feel free to improve if it 243 * gets too taxing on your system. 244 */ 245 olddir = psn->dir; 246 nent = psn->dentnext; 247 248 /* 249 * note: for the "getattr in batch" to work, this must be before 250 * the attribute-getting. Otherwise times for first entries in 251 * large directories might expire before the directory itself and 252 * result in one-by-one attribute fetching. 253 */ 254 psn->dentread = time(NULL); 255 256 psn->dentnext = 0; 257 psn->denttot = 0; 258 psn->dir = NULL; 259 idx = 0; 260 261 for (;;) { 262 reqid = NEXTREQ(pctx); 263 psbuf_recycleout(pb); 264 psbuf_req_data(pb, SSH_FXP_READDIR, reqid, dhand, dhandlen); 265 puffs_framebuf_enqueue_cc(pcc, pb); 266 267 /* check for EOF */ 268 if (psbuf_get_type(pb) == SSH_FXP_STATUS) { 269 rv = psbuf_expect_status(pb); 270 goto out; 271 } 272 rv = psbuf_expect_name(pb, &count); 273 if (rv) 274 goto out; 275 276 for (; count--; idx++) { 277 if (idx == psn->denttot) 278 allocdirs(psn); 279 if ((rv = psbuf_get_str(pb, 280 &psn->dir[idx].entryname, NULL))) 281 goto out; 282 if ((rv = psbuf_get_str(pb, &longname, NULL))) 283 goto out; 284 if ((rv = psbuf_get_vattr(pb, &psn->dir[idx].va))) 285 goto out; 286 if (sscanf(longname, "%*s%d", 287 &psn->dir[idx].va.va_nlink) != 1) { 288 rv = EPROTO; 289 goto out; 290 } 291 free(longname); 292 293 testd = lookup(olddir, nent, psn->dir[idx].entryname); 294 if (testd) { 295 psn->dir[idx].entry = testd->entry; 296 psn->dir[idx].va = testd->va; 297 } else { 298 psn->dir[idx].entry = NULL; 299 psn->dir[idx].va.va_fileid = pctx->nextino++; 300 } 301 #ifdef SUPERREADDIR 302 /* 303 * XXX: there's a dangling pointer race here if 304 * the server responds to our queries out-of-order. 305 * fixxxme some day 306 */ 307 readdir_getattr(puffs_cc_getusermount(pcc), 308 psn, PNPATH(pn), idx); 309 #endif 310 psn->dir[idx].valid = 1; 311 } 312 } 313 314 out: 315 /* XXX: rv */ 316 psn->dentnext = idx; 317 freedircache(olddir, nent); 318 319 reqid = NEXTREQ(pctx); 320 psbuf_recycleout(pb); 321 psbuf_req_data(pb, SSH_FXP_CLOSE, reqid, dhand, dhandlen); 322 323 puffs_framebuf_enqueue_justsend(puffs_cc_getusermount(pcc), pb, 1); 324 free(dhand); 325 return rv; 326 327 wayout: 328 free(dhand); 329 PSSHFSRETURN(rv); 330 } 331 332 struct puffs_node * 333 makenode(struct puffs_usermount *pu, struct puffs_node *parent, 334 struct psshfs_dir *pd, const struct vattr *vap) 335 { 336 struct psshfs_node *psn_parent = parent->pn_data; 337 struct psshfs_node *psn; 338 struct puffs_node *pn; 339 340 psn = emalloc(sizeof(struct psshfs_node)); 341 memset(psn, 0, sizeof(struct psshfs_node)); 342 343 pn = puffs_pn_new(pu, psn); 344 if (!pn) { 345 free(psn); 346 return NULL; 347 } 348 puffs_setvattr(&pn->pn_va, &pd->va); 349 psn->attrread = pd->attrread; 350 puffs_setvattr(&pn->pn_va, vap); 351 352 pd->entry = pn; 353 psn->parent = parent; 354 psn_parent->childcount++; 355 356 return pn; 357 } 358 359 struct puffs_node * 360 allocnode(struct puffs_usermount *pu, struct puffs_node *parent, 361 const char *entryname, const struct vattr *vap) 362 { 363 struct psshfs_ctx *pctx = puffs_getspecific(pu); 364 struct psshfs_dir *pd; 365 struct puffs_node *pn; 366 367 pd = direnter(parent, entryname); 368 369 pd->va.va_fileid = pctx->nextino++; 370 if (vap->va_type == VDIR) { 371 pd->va.va_nlink = 2; 372 parent->pn_va.va_nlink++; 373 } else { 374 pd->va.va_nlink = 1; 375 } 376 377 pn = makenode(pu, parent, pd, vap); 378 if (pn) 379 pd->va.va_fileid = pn->pn_va.va_fileid; 380 381 return pn; 382 } 383 384 struct psshfs_dir * 385 direnter(struct puffs_node *parent, const char *entryname) 386 { 387 struct psshfs_node *psn_parent = parent->pn_data; 388 struct psshfs_dir *pd; 389 int i; 390 391 /* create directory entry */ 392 if (psn_parent->denttot == psn_parent->dentnext) 393 allocdirs(psn_parent); 394 395 i = psn_parent->dentnext; 396 pd = &psn_parent->dir[i]; 397 pd->entryname = estrdup(entryname); 398 pd->valid = 1; 399 pd->attrread = 0; 400 puffs_vattr_null(&pd->va); 401 psn_parent->dentnext++; 402 403 return pd; 404 } 405 406 void 407 doreclaim(struct puffs_node *pn) 408 { 409 struct psshfs_node *psn = pn->pn_data; 410 struct psshfs_node *psn_parent; 411 struct psshfs_dir *dent; 412 413 psn_parent = psn->parent->pn_data; 414 psn_parent->childcount--; 415 416 /* 417 * Null out entry from directory. Do not treat a missing entry 418 * as an invariant error, since the node might be removed from 419 * under us, and we might do a readdir before the reclaim resulting 420 * in no directory entry in the parent directory. 421 */ 422 dent = lookup_by_entry(psn_parent->dir, psn_parent->dentnext, pn); 423 if (dent) 424 dent->entry = NULL; 425 426 if (pn->pn_va.va_type == VDIR) 427 freedircache(psn->dir, psn->dentnext); 428 429 puffs_pn_put(pn); 430 } 431 432 void 433 nukenode(struct puffs_node *node, const char *entryname, int reclaim) 434 { 435 struct psshfs_node *psn, *psn_parent; 436 struct psshfs_dir *pd; 437 438 psn = node->pn_data; 439 psn_parent = psn->parent->pn_data; 440 pd = lookup(psn_parent->dir, psn_parent->dentnext, entryname); 441 assert(pd != NULL); 442 pd->valid = 0; 443 free(pd->entryname); 444 pd->entryname = NULL; 445 446 if (node->pn_va.va_type == VDIR) 447 psn->parent->pn_va.va_nlink--; 448 449 if (reclaim) 450 doreclaim(node); 451 } 452
Indexes created Tue Sep 23 22:09:46 GMT 2025