| 1 | /* $NetBSD: coda_vnops.c,v 1.103 2016/08/20 12:37:06 hannken Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * |
| 5 | * Coda: an Experimental Distributed File System |
| 6 | * Release 3.1 |
| 7 | * |
| 8 | * Copyright (c) 1987-1998 Carnegie Mellon University |
| 9 | * All Rights Reserved |
| 10 | * |
| 11 | * Permission to use, copy, modify and distribute this software and its |
| 12 | * documentation is hereby granted, provided that both the copyright |
| 13 | * notice and this permission notice appear in all copies of the |
| 14 | * software, derivative works or modified versions, and any portions |
| 15 | * thereof, and that both notices appear in supporting documentation, and |
| 16 | * that credit is given to Carnegie Mellon University in all documents |
| 17 | * and publicity pertaining to direct or indirect use of this code or its |
| 18 | * derivatives. |
| 19 | * |
| 20 | * CODA IS AN EXPERIMENTAL SOFTWARE SYSTEM AND IS KNOWN TO HAVE BUGS, |
| 21 | * SOME OF WHICH MAY HAVE SERIOUS CONSEQUENCES. CARNEGIE MELLON ALLOWS |
| 22 | * FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION. CARNEGIE MELLON |
| 23 | * DISCLAIMS ANY LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER |
| 24 | * RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OF THIS SOFTWARE OR OF |
| 25 | * ANY DERIVATIVE WORK. |
| 26 | * |
| 27 | * Carnegie Mellon encourages users of this software to return any |
| 28 | * improvements or extensions that they make, and to grant Carnegie |
| 29 | * Mellon the rights to redistribute these changes without encumbrance. |
| 30 | * |
| 31 | * @(#) coda/coda_vnops.c,v 1.1.1.1 1998/08/29 21:26:46 rvb Exp $ |
| 32 | */ |
| 33 | |
| 34 | /* |
| 35 | * Mach Operating System |
| 36 | * Copyright (c) 1990 Carnegie-Mellon University |
| 37 | * Copyright (c) 1989 Carnegie-Mellon University |
| 38 | * All rights reserved. The CMU software License Agreement specifies |
| 39 | * the terms and conditions for use and redistribution. |
| 40 | */ |
| 41 | |
| 42 | /* |
| 43 | * This code was written for the Coda file system at Carnegie Mellon |
| 44 | * University. Contributers include David Steere, James Kistler, and |
| 45 | * M. Satyanarayanan. |
| 46 | */ |
| 47 | |
| 48 | #include <sys/cdefs.h> |
| 49 | __KERNEL_RCSID(0, "$NetBSD: coda_vnops.c,v 1.103 2016/08/20 12:37:06 hannken Exp $" ); |
| 50 | |
| 51 | #include <sys/param.h> |
| 52 | #include <sys/systm.h> |
| 53 | #include <sys/malloc.h> |
| 54 | #include <sys/errno.h> |
| 55 | #include <sys/acct.h> |
| 56 | #include <sys/file.h> |
| 57 | #include <sys/uio.h> |
| 58 | #include <sys/namei.h> |
| 59 | #include <sys/ioctl.h> |
| 60 | #include <sys/mount.h> |
| 61 | #include <sys/proc.h> |
| 62 | #include <sys/select.h> |
| 63 | #include <sys/vnode.h> |
| 64 | #include <sys/kauth.h> |
| 65 | |
| 66 | #include <miscfs/genfs/genfs.h> |
| 67 | #include <miscfs/specfs/specdev.h> |
| 68 | |
| 69 | #include <coda/coda.h> |
| 70 | #include <coda/cnode.h> |
| 71 | #include <coda/coda_vnops.h> |
| 72 | #include <coda/coda_venus.h> |
| 73 | #include <coda/coda_opstats.h> |
| 74 | #include <coda/coda_subr.h> |
| 75 | #include <coda/coda_namecache.h> |
| 76 | #include <coda/coda_pioctl.h> |
| 77 | |
| 78 | /* |
| 79 | * These flags select various performance enhancements. |
| 80 | */ |
| 81 | int coda_attr_cache = 1; /* Set to cache attributes in the kernel */ |
| 82 | int coda_symlink_cache = 1; /* Set to cache symbolic link information */ |
| 83 | int coda_access_cache = 1; /* Set to handle some access checks directly */ |
| 84 | |
| 85 | /* structure to keep track of vfs calls */ |
| 86 | |
| 87 | struct coda_op_stats coda_vnodeopstats[CODA_VNODEOPS_SIZE]; |
| 88 | |
| 89 | #define MARK_ENTRY(op) (coda_vnodeopstats[op].entries++) |
| 90 | #define MARK_INT_SAT(op) (coda_vnodeopstats[op].sat_intrn++) |
| 91 | #define MARK_INT_FAIL(op) (coda_vnodeopstats[op].unsat_intrn++) |
| 92 | #define MARK_INT_GEN(op) (coda_vnodeopstats[op].gen_intrn++) |
| 93 | |
| 94 | /* What we are delaying for in printf */ |
| 95 | static int coda_lockdebug = 0; |
| 96 | |
| 97 | #define ENTRY if(coda_vnop_print_entry) myprintf(("Entered %s\n",__func__)) |
| 98 | |
| 99 | /* Definition of the vnode operation vector */ |
| 100 | |
| 101 | const struct vnodeopv_entry_desc coda_vnodeop_entries[] = { |
| 102 | { &vop_default_desc, coda_vop_error }, |
| 103 | { &vop_lookup_desc, coda_lookup }, /* lookup */ |
| 104 | { &vop_create_desc, coda_create }, /* create */ |
| 105 | { &vop_mknod_desc, coda_vop_error }, /* mknod */ |
| 106 | { &vop_open_desc, coda_open }, /* open */ |
| 107 | { &vop_close_desc, coda_close }, /* close */ |
| 108 | { &vop_access_desc, coda_access }, /* access */ |
| 109 | { &vop_getattr_desc, coda_getattr }, /* getattr */ |
| 110 | { &vop_setattr_desc, coda_setattr }, /* setattr */ |
| 111 | { &vop_read_desc, coda_read }, /* read */ |
| 112 | { &vop_write_desc, coda_write }, /* write */ |
| 113 | { &vop_fallocate_desc, genfs_eopnotsupp }, /* fallocate */ |
| 114 | { &vop_fdiscard_desc, genfs_eopnotsupp }, /* fdiscard */ |
| 115 | { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */ |
| 116 | { &vop_ioctl_desc, coda_ioctl }, /* ioctl */ |
| 117 | { &vop_mmap_desc, genfs_mmap }, /* mmap */ |
| 118 | { &vop_fsync_desc, coda_fsync }, /* fsync */ |
| 119 | { &vop_remove_desc, coda_remove }, /* remove */ |
| 120 | { &vop_link_desc, coda_link }, /* link */ |
| 121 | { &vop_rename_desc, coda_rename }, /* rename */ |
| 122 | { &vop_mkdir_desc, coda_mkdir }, /* mkdir */ |
| 123 | { &vop_rmdir_desc, coda_rmdir }, /* rmdir */ |
| 124 | { &vop_symlink_desc, coda_symlink }, /* symlink */ |
| 125 | { &vop_readdir_desc, coda_readdir }, /* readdir */ |
| 126 | { &vop_readlink_desc, coda_readlink }, /* readlink */ |
| 127 | { &vop_abortop_desc, coda_abortop }, /* abortop */ |
| 128 | { &vop_inactive_desc, coda_inactive }, /* inactive */ |
| 129 | { &vop_reclaim_desc, coda_reclaim }, /* reclaim */ |
| 130 | { &vop_lock_desc, coda_lock }, /* lock */ |
| 131 | { &vop_unlock_desc, coda_unlock }, /* unlock */ |
| 132 | { &vop_bmap_desc, coda_bmap }, /* bmap */ |
| 133 | { &vop_strategy_desc, coda_strategy }, /* strategy */ |
| 134 | { &vop_print_desc, coda_vop_error }, /* print */ |
| 135 | { &vop_islocked_desc, coda_islocked }, /* islocked */ |
| 136 | { &vop_pathconf_desc, coda_vop_error }, /* pathconf */ |
| 137 | { &vop_advlock_desc, coda_vop_nop }, /* advlock */ |
| 138 | { &vop_bwrite_desc, coda_vop_error }, /* bwrite */ |
| 139 | { &vop_seek_desc, genfs_seek }, /* seek */ |
| 140 | { &vop_poll_desc, genfs_poll }, /* poll */ |
| 141 | { &vop_getpages_desc, coda_getpages }, /* getpages */ |
| 142 | { &vop_putpages_desc, coda_putpages }, /* putpages */ |
| 143 | { NULL, NULL } |
| 144 | }; |
| 145 | |
| 146 | static void coda_print_vattr(struct vattr *); |
| 147 | |
| 148 | int (**coda_vnodeop_p)(void *); |
| 149 | const struct vnodeopv_desc coda_vnodeop_opv_desc = |
| 150 | { &coda_vnodeop_p, coda_vnodeop_entries }; |
| 151 | |
| 152 | /* Definitions of NetBSD vnodeop interfaces */ |
| 153 | |
| 154 | /* |
| 155 | * A generic error routine. Return EIO without looking at arguments. |
| 156 | */ |
| 157 | int |
| 158 | coda_vop_error(void *anon) { |
| 159 | struct vnodeop_desc **desc = (struct vnodeop_desc **)anon; |
| 160 | |
| 161 | if (codadebug) { |
| 162 | myprintf(("%s: Vnode operation %s called (error).\n" , |
| 163 | __func__, (*desc)->vdesc_name)); |
| 164 | } |
| 165 | |
| 166 | return EIO; |
| 167 | } |
| 168 | |
| 169 | /* A generic do-nothing. */ |
| 170 | int |
| 171 | coda_vop_nop(void *anon) { |
| 172 | struct vnodeop_desc **desc = (struct vnodeop_desc **)anon; |
| 173 | |
| 174 | if (codadebug) { |
| 175 | myprintf(("Vnode operation %s called, but unsupported\n" , |
| 176 | (*desc)->vdesc_name)); |
| 177 | } |
| 178 | return (0); |
| 179 | } |
| 180 | |
| 181 | int |
| 182 | coda_vnodeopstats_init(void) |
| 183 | { |
| 184 | int i; |
| 185 | |
| 186 | for(i=0;i<CODA_VNODEOPS_SIZE;i++) { |
| 187 | coda_vnodeopstats[i].opcode = i; |
| 188 | coda_vnodeopstats[i].entries = 0; |
| 189 | coda_vnodeopstats[i].sat_intrn = 0; |
| 190 | coda_vnodeopstats[i].unsat_intrn = 0; |
| 191 | coda_vnodeopstats[i].gen_intrn = 0; |
| 192 | } |
| 193 | |
| 194 | return 0; |
| 195 | } |
| 196 | |
| 197 | /* |
| 198 | * XXX The entire relationship between VOP_OPEN and having a container |
| 199 | * file (via venus_open) needs to be reexamined. In particular, it's |
| 200 | * valid to open/mmap/close and then reference. Instead of doing |
| 201 | * VOP_OPEN when getpages needs a container, we should do the |
| 202 | * venus_open part, and record that the vnode has opened the container |
| 203 | * for getpages, and do the matching logical close on coda_inactive. |
| 204 | * Further, coda_rdwr needs a container file, and sometimes needs to |
| 205 | * do the equivalent of open (core dumps). |
| 206 | */ |
| 207 | /* |
| 208 | * coda_open calls Venus to return the device and inode of the |
| 209 | * container file, and then obtains a vnode for that file. The |
| 210 | * container vnode is stored in the coda vnode, and a reference is |
| 211 | * added for each open file. |
| 212 | */ |
| 213 | int |
| 214 | coda_open(void *v) |
| 215 | { |
| 216 | /* |
| 217 | * NetBSD can pass the O_EXCL flag in mode, even though the check |
| 218 | * has already happened. Venus defensively assumes that if open |
| 219 | * is passed the EXCL, it must be a bug. We strip the flag here. |
| 220 | */ |
| 221 | /* true args */ |
| 222 | struct vop_open_args *ap = v; |
| 223 | vnode_t *vp = ap->a_vp; |
| 224 | struct cnode *cp = VTOC(vp); |
| 225 | int flag = ap->a_mode & (~O_EXCL); |
| 226 | kauth_cred_t cred = ap->a_cred; |
| 227 | /* locals */ |
| 228 | int error; |
| 229 | dev_t dev; /* container file device, inode, vnode */ |
| 230 | ino_t inode; |
| 231 | vnode_t *container_vp; |
| 232 | |
| 233 | MARK_ENTRY(CODA_OPEN_STATS); |
| 234 | |
| 235 | KASSERT(VOP_ISLOCKED(vp)); |
| 236 | /* Check for open of control file. */ |
| 237 | if (IS_CTL_VP(vp)) { |
| 238 | /* if (WRITABLE(flag)) */ |
| 239 | if (flag & (FWRITE | O_TRUNC | O_CREAT | O_EXCL)) { |
| 240 | MARK_INT_FAIL(CODA_OPEN_STATS); |
| 241 | return(EACCES); |
| 242 | } |
| 243 | MARK_INT_SAT(CODA_OPEN_STATS); |
| 244 | return(0); |
| 245 | } |
| 246 | |
| 247 | error = venus_open(vtomi(vp), &cp->c_fid, flag, cred, curlwp, &dev, &inode); |
| 248 | if (error) |
| 249 | return (error); |
| 250 | if (!error) { |
| 251 | CODADEBUG(CODA_OPEN, myprintf(( |
| 252 | "%s: dev 0x%llx inode %llu result %d\n" , __func__, |
| 253 | (unsigned long long)dev, (unsigned long long)inode, error));) |
| 254 | } |
| 255 | |
| 256 | /* |
| 257 | * Obtain locked and referenced container vnode from container |
| 258 | * device/inode. |
| 259 | */ |
| 260 | error = coda_grab_vnode(vp, dev, inode, &container_vp); |
| 261 | if (error) |
| 262 | return (error); |
| 263 | |
| 264 | /* Save the vnode pointer for the container file. */ |
| 265 | if (cp->c_ovp == NULL) { |
| 266 | cp->c_ovp = container_vp; |
| 267 | } else { |
| 268 | if (cp->c_ovp != container_vp) |
| 269 | /* |
| 270 | * Perhaps venus returned a different container, or |
| 271 | * something else went wrong. |
| 272 | */ |
| 273 | panic("%s: cp->c_ovp != container_vp" , __func__); |
| 274 | } |
| 275 | cp->c_ocount++; |
| 276 | |
| 277 | /* Flush the attribute cache if writing the file. */ |
| 278 | if (flag & FWRITE) { |
| 279 | cp->c_owrite++; |
| 280 | cp->c_flags &= ~C_VATTR; |
| 281 | } |
| 282 | |
| 283 | /* |
| 284 | * Save the <device, inode> pair for the container file to speed |
| 285 | * up subsequent reads while closed (mmap, program execution). |
| 286 | * This is perhaps safe because venus will invalidate the node |
| 287 | * before changing the container file mapping. |
| 288 | */ |
| 289 | cp->c_device = dev; |
| 290 | cp->c_inode = inode; |
| 291 | |
| 292 | /* Open the container file. */ |
| 293 | error = VOP_OPEN(container_vp, flag, cred); |
| 294 | /* |
| 295 | * Drop the lock on the container, after we have done VOP_OPEN |
| 296 | * (which requires a locked vnode). |
| 297 | */ |
| 298 | VOP_UNLOCK(container_vp); |
| 299 | return(error); |
| 300 | } |
| 301 | |
| 302 | /* |
| 303 | * Close the cache file used for I/O and notify Venus. |
| 304 | */ |
| 305 | int |
| 306 | coda_close(void *v) |
| 307 | { |
| 308 | /* true args */ |
| 309 | struct vop_close_args *ap = v; |
| 310 | vnode_t *vp = ap->a_vp; |
| 311 | struct cnode *cp = VTOC(vp); |
| 312 | int flag = ap->a_fflag; |
| 313 | kauth_cred_t cred = ap->a_cred; |
| 314 | /* locals */ |
| 315 | int error; |
| 316 | |
| 317 | MARK_ENTRY(CODA_CLOSE_STATS); |
| 318 | |
| 319 | /* Check for close of control file. */ |
| 320 | if (IS_CTL_VP(vp)) { |
| 321 | MARK_INT_SAT(CODA_CLOSE_STATS); |
| 322 | return(0); |
| 323 | } |
| 324 | |
| 325 | /* |
| 326 | * XXX The IS_UNMOUNTING part of this is very suspect. |
| 327 | */ |
| 328 | if (IS_UNMOUNTING(cp)) { |
| 329 | if (cp->c_ovp) { |
| 330 | #ifdef CODA_VERBOSE |
| 331 | printf("%s: destroying container %d, ufs vp %p of vp %p/cp %p\n" , |
| 332 | __func__, vp->v_usecount, cp->c_ovp, vp, cp); |
| 333 | #endif |
| 334 | #ifdef hmm |
| 335 | vgone(cp->c_ovp); |
| 336 | #else |
| 337 | vn_lock(cp->c_ovp, LK_EXCLUSIVE | LK_RETRY); |
| 338 | VOP_CLOSE(cp->c_ovp, flag, cred); /* Do errors matter here? */ |
| 339 | vput(cp->c_ovp); |
| 340 | #endif |
| 341 | } else { |
| 342 | #ifdef CODA_VERBOSE |
| 343 | printf("%s: NO container vp %p/cp %p\n" , __func__, vp, cp); |
| 344 | #endif |
| 345 | } |
| 346 | return ENODEV; |
| 347 | } |
| 348 | |
| 349 | /* Lock the container node, and VOP_CLOSE it. */ |
| 350 | vn_lock(cp->c_ovp, LK_EXCLUSIVE | LK_RETRY); |
| 351 | VOP_CLOSE(cp->c_ovp, flag, cred); /* Do errors matter here? */ |
| 352 | /* |
| 353 | * Drop the lock we just obtained, and vrele the container vnode. |
| 354 | * Decrement reference counts, and clear container vnode pointer on |
| 355 | * last close. |
| 356 | */ |
| 357 | vput(cp->c_ovp); |
| 358 | if (flag & FWRITE) |
| 359 | --cp->c_owrite; |
| 360 | if (--cp->c_ocount == 0) |
| 361 | cp->c_ovp = NULL; |
| 362 | |
| 363 | error = venus_close(vtomi(vp), &cp->c_fid, flag, cred, curlwp); |
| 364 | |
| 365 | CODADEBUG(CODA_CLOSE, myprintf(("%s: result %d\n" , __func__, error)); ) |
| 366 | return(error); |
| 367 | } |
| 368 | |
| 369 | int |
| 370 | coda_read(void *v) |
| 371 | { |
| 372 | struct vop_read_args *ap = v; |
| 373 | |
| 374 | ENTRY; |
| 375 | return(coda_rdwr(ap->a_vp, ap->a_uio, UIO_READ, |
| 376 | ap->a_ioflag, ap->a_cred, curlwp)); |
| 377 | } |
| 378 | |
| 379 | int |
| 380 | coda_write(void *v) |
| 381 | { |
| 382 | struct vop_write_args *ap = v; |
| 383 | |
| 384 | ENTRY; |
| 385 | return(coda_rdwr(ap->a_vp, ap->a_uio, UIO_WRITE, |
| 386 | ap->a_ioflag, ap->a_cred, curlwp)); |
| 387 | } |
| 388 | |
| 389 | int |
| 390 | coda_rdwr(vnode_t *vp, struct uio *uiop, enum uio_rw rw, int ioflag, |
| 391 | kauth_cred_t cred, struct lwp *l) |
| 392 | { |
| 393 | /* upcall decl */ |
| 394 | /* NOTE: container file operation!!! */ |
| 395 | /* locals */ |
| 396 | struct cnode *cp = VTOC(vp); |
| 397 | vnode_t *cfvp = cp->c_ovp; |
| 398 | struct proc *p = l->l_proc; |
| 399 | int opened_internally = 0; |
| 400 | int error = 0; |
| 401 | |
| 402 | MARK_ENTRY(CODA_RDWR_STATS); |
| 403 | |
| 404 | CODADEBUG(CODA_RDWR, myprintf(("coda_rdwr(%d, %p, %lu, %lld)\n" , rw, |
| 405 | uiop->uio_iov->iov_base, (unsigned long) uiop->uio_resid, |
| 406 | (long long) uiop->uio_offset)); ) |
| 407 | |
| 408 | /* Check for rdwr of control object. */ |
| 409 | if (IS_CTL_VP(vp)) { |
| 410 | MARK_INT_FAIL(CODA_RDWR_STATS); |
| 411 | return(EINVAL); |
| 412 | } |
| 413 | |
| 414 | /* Redirect the request to UFS. */ |
| 415 | |
| 416 | /* |
| 417 | * If file is not already open this must be a page |
| 418 | * {read,write} request. Iget the cache file's inode |
| 419 | * pointer if we still have its <device, inode> pair. |
| 420 | * Otherwise, we must do an internal open to derive the |
| 421 | * pair. |
| 422 | * XXX Integrate this into a coherent strategy for container |
| 423 | * file acquisition. |
| 424 | */ |
| 425 | if (cfvp == NULL) { |
| 426 | /* |
| 427 | * If we're dumping core, do the internal open. Otherwise |
| 428 | * venus won't have the correct size of the core when |
| 429 | * it's completely written. |
| 430 | */ |
| 431 | if (cp->c_inode != 0 && !(p && (p->p_acflag & ACORE))) { |
| 432 | #ifdef CODA_VERBOSE |
| 433 | printf("%s: grabbing container vnode, losing reference\n" , |
| 434 | __func__); |
| 435 | #endif |
| 436 | /* Get locked and refed vnode. */ |
| 437 | error = coda_grab_vnode(vp, cp->c_device, cp->c_inode, &cfvp); |
| 438 | if (error) { |
| 439 | MARK_INT_FAIL(CODA_RDWR_STATS); |
| 440 | return(error); |
| 441 | } |
| 442 | /* |
| 443 | * Drop lock. |
| 444 | * XXX Where is reference released. |
| 445 | */ |
| 446 | VOP_UNLOCK(cfvp); |
| 447 | } |
| 448 | else { |
| 449 | #ifdef CODA_VERBOSE |
| 450 | printf("%s: internal VOP_OPEN\n" , __func__); |
| 451 | #endif |
| 452 | opened_internally = 1; |
| 453 | MARK_INT_GEN(CODA_OPEN_STATS); |
| 454 | error = VOP_OPEN(vp, (rw == UIO_READ ? FREAD : FWRITE), cred); |
| 455 | #ifdef CODA_VERBOSE |
| 456 | printf("%s: Internally Opening %p\n" , __func__, vp); |
| 457 | #endif |
| 458 | if (error) { |
| 459 | MARK_INT_FAIL(CODA_RDWR_STATS); |
| 460 | return(error); |
| 461 | } |
| 462 | cfvp = cp->c_ovp; |
| 463 | } |
| 464 | } |
| 465 | |
| 466 | /* Have UFS handle the call. */ |
| 467 | CODADEBUG(CODA_RDWR, myprintf(("%s: fid = %s, refcnt = %d\n" , __func__, |
| 468 | coda_f2s(&cp->c_fid), CTOV(cp)->v_usecount)); ) |
| 469 | |
| 470 | if (rw == UIO_READ) { |
| 471 | error = VOP_READ(cfvp, uiop, ioflag, cred); |
| 472 | } else { |
| 473 | error = VOP_WRITE(cfvp, uiop, ioflag, cred); |
| 474 | } |
| 475 | |
| 476 | if (error) |
| 477 | MARK_INT_FAIL(CODA_RDWR_STATS); |
| 478 | else |
| 479 | MARK_INT_SAT(CODA_RDWR_STATS); |
| 480 | |
| 481 | /* Do an internal close if necessary. */ |
| 482 | if (opened_internally) { |
| 483 | MARK_INT_GEN(CODA_CLOSE_STATS); |
| 484 | (void)VOP_CLOSE(vp, (rw == UIO_READ ? FREAD : FWRITE), cred); |
| 485 | } |
| 486 | |
| 487 | /* Invalidate cached attributes if writing. */ |
| 488 | if (rw == UIO_WRITE) |
| 489 | cp->c_flags &= ~C_VATTR; |
| 490 | return(error); |
| 491 | } |
| 492 | |
| 493 | int |
| 494 | coda_ioctl(void *v) |
| 495 | { |
| 496 | /* true args */ |
| 497 | struct vop_ioctl_args *ap = v; |
| 498 | vnode_t *vp = ap->a_vp; |
| 499 | int com = ap->a_command; |
| 500 | void *data = ap->a_data; |
| 501 | int flag = ap->a_fflag; |
| 502 | kauth_cred_t cred = ap->a_cred; |
| 503 | /* locals */ |
| 504 | int error; |
| 505 | vnode_t *tvp; |
| 506 | struct PioctlData *iap = (struct PioctlData *)data; |
| 507 | namei_simple_flags_t sflags; |
| 508 | |
| 509 | MARK_ENTRY(CODA_IOCTL_STATS); |
| 510 | |
| 511 | CODADEBUG(CODA_IOCTL, myprintf(("in coda_ioctl on %s\n" , iap->path));) |
| 512 | |
| 513 | /* Don't check for operation on a dying object, for ctlvp it |
| 514 | shouldn't matter */ |
| 515 | |
| 516 | /* Must be control object to succeed. */ |
| 517 | if (!IS_CTL_VP(vp)) { |
| 518 | MARK_INT_FAIL(CODA_IOCTL_STATS); |
| 519 | CODADEBUG(CODA_IOCTL, myprintf(("%s error: vp != ctlvp" , __func__));) |
| 520 | return (EOPNOTSUPP); |
| 521 | } |
| 522 | /* Look up the pathname. */ |
| 523 | |
| 524 | /* Should we use the name cache here? It would get it from |
| 525 | lookupname sooner or later anyway, right? */ |
| 526 | |
| 527 | sflags = iap->follow ? NSM_FOLLOW_NOEMULROOT : NSM_NOFOLLOW_NOEMULROOT; |
| 528 | error = namei_simple_user(iap->path, sflags, &tvp); |
| 529 | |
| 530 | if (error) { |
| 531 | MARK_INT_FAIL(CODA_IOCTL_STATS); |
| 532 | CODADEBUG(CODA_IOCTL, myprintf(("%s error: lookup returns %d\n" , |
| 533 | __func__, error));) |
| 534 | return(error); |
| 535 | } |
| 536 | |
| 537 | /* |
| 538 | * Make sure this is a coda style cnode, but it may be a |
| 539 | * different vfsp |
| 540 | */ |
| 541 | /* XXX: this totally violates the comment about vtagtype in vnode.h */ |
| 542 | if (tvp->v_tag != VT_CODA) { |
| 543 | vrele(tvp); |
| 544 | MARK_INT_FAIL(CODA_IOCTL_STATS); |
| 545 | CODADEBUG(CODA_IOCTL, myprintf(("%s error: %s not a coda object\n" , |
| 546 | __func__, iap->path));) |
| 547 | return(EINVAL); |
| 548 | } |
| 549 | |
| 550 | if (iap->vi.in_size > VC_MAXDATASIZE || iap->vi.out_size > VC_MAXDATASIZE) { |
| 551 | vrele(tvp); |
| 552 | return(EINVAL); |
| 553 | } |
| 554 | error = venus_ioctl(vtomi(tvp), &((VTOC(tvp))->c_fid), com, flag, data, |
| 555 | cred, curlwp); |
| 556 | |
| 557 | if (error) |
| 558 | MARK_INT_FAIL(CODA_IOCTL_STATS); |
| 559 | else |
| 560 | CODADEBUG(CODA_IOCTL, myprintf(("Ioctl returns %d \n" , error)); ) |
| 561 | |
| 562 | vrele(tvp); |
| 563 | return(error); |
| 564 | } |
| 565 | |
| 566 | /* |
| 567 | * To reduce the cost of a user-level venus;we cache attributes in |
| 568 | * the kernel. Each cnode has storage allocated for an attribute. If |
| 569 | * c_vattr is valid, return a reference to it. Otherwise, get the |
| 570 | * attributes from venus and store them in the cnode. There is some |
| 571 | * question if this method is a security leak. But I think that in |
| 572 | * order to make this call, the user must have done a lookup and |
| 573 | * opened the file, and therefore should already have access. |
| 574 | */ |
| 575 | int |
| 576 | coda_getattr(void *v) |
| 577 | { |
| 578 | /* true args */ |
| 579 | struct vop_getattr_args *ap = v; |
| 580 | vnode_t *vp = ap->a_vp; |
| 581 | struct cnode *cp = VTOC(vp); |
| 582 | struct vattr *vap = ap->a_vap; |
| 583 | kauth_cred_t cred = ap->a_cred; |
| 584 | /* locals */ |
| 585 | int error; |
| 586 | |
| 587 | MARK_ENTRY(CODA_GETATTR_STATS); |
| 588 | |
| 589 | /* Check for getattr of control object. */ |
| 590 | if (IS_CTL_VP(vp)) { |
| 591 | MARK_INT_FAIL(CODA_GETATTR_STATS); |
| 592 | return(ENOENT); |
| 593 | } |
| 594 | |
| 595 | /* Check to see if the attributes have already been cached */ |
| 596 | if (VALID_VATTR(cp)) { |
| 597 | CODADEBUG(CODA_GETATTR, { myprintf(("%s: attr cache hit: %s\n" , |
| 598 | __func__, coda_f2s(&cp->c_fid)));}) |
| 599 | CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR)) |
| 600 | coda_print_vattr(&cp->c_vattr); ) |
| 601 | |
| 602 | *vap = cp->c_vattr; |
| 603 | MARK_INT_SAT(CODA_GETATTR_STATS); |
| 604 | return(0); |
| 605 | } |
| 606 | |
| 607 | error = venus_getattr(vtomi(vp), &cp->c_fid, cred, curlwp, vap); |
| 608 | |
| 609 | if (!error) { |
| 610 | CODADEBUG(CODA_GETATTR, myprintf(("%s miss %s: result %d\n" , |
| 611 | __func__, coda_f2s(&cp->c_fid), error)); ) |
| 612 | |
| 613 | CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR)) |
| 614 | coda_print_vattr(vap); ) |
| 615 | |
| 616 | /* If not open for write, store attributes in cnode */ |
| 617 | if ((cp->c_owrite == 0) && (coda_attr_cache)) { |
| 618 | cp->c_vattr = *vap; |
| 619 | cp->c_flags |= C_VATTR; |
| 620 | } |
| 621 | |
| 622 | } |
| 623 | return(error); |
| 624 | } |
| 625 | |
| 626 | int |
| 627 | coda_setattr(void *v) |
| 628 | { |
| 629 | /* true args */ |
| 630 | struct vop_setattr_args *ap = v; |
| 631 | vnode_t *vp = ap->a_vp; |
| 632 | struct cnode *cp = VTOC(vp); |
| 633 | struct vattr *vap = ap->a_vap; |
| 634 | kauth_cred_t cred = ap->a_cred; |
| 635 | /* locals */ |
| 636 | int error; |
| 637 | |
| 638 | MARK_ENTRY(CODA_SETATTR_STATS); |
| 639 | |
| 640 | /* Check for setattr of control object. */ |
| 641 | if (IS_CTL_VP(vp)) { |
| 642 | MARK_INT_FAIL(CODA_SETATTR_STATS); |
| 643 | return(ENOENT); |
| 644 | } |
| 645 | |
| 646 | if (codadebug & CODADBGMSK(CODA_SETATTR)) { |
| 647 | coda_print_vattr(vap); |
| 648 | } |
| 649 | error = venus_setattr(vtomi(vp), &cp->c_fid, vap, cred, curlwp); |
| 650 | |
| 651 | if (!error) |
| 652 | cp->c_flags &= ~C_VATTR; |
| 653 | |
| 654 | CODADEBUG(CODA_SETATTR, myprintf(("setattr %d\n" , error)); ) |
| 655 | return(error); |
| 656 | } |
| 657 | |
| 658 | int |
| 659 | coda_access(void *v) |
| 660 | { |
| 661 | /* true args */ |
| 662 | struct vop_access_args *ap = v; |
| 663 | vnode_t *vp = ap->a_vp; |
| 664 | struct cnode *cp = VTOC(vp); |
| 665 | int mode = ap->a_mode; |
| 666 | kauth_cred_t cred = ap->a_cred; |
| 667 | /* locals */ |
| 668 | int error; |
| 669 | |
| 670 | MARK_ENTRY(CODA_ACCESS_STATS); |
| 671 | |
| 672 | /* Check for access of control object. Only read access is |
| 673 | allowed on it. */ |
| 674 | if (IS_CTL_VP(vp)) { |
| 675 | /* bogus hack - all will be marked as successes */ |
| 676 | MARK_INT_SAT(CODA_ACCESS_STATS); |
| 677 | return(((mode & VREAD) && !(mode & (VWRITE | VEXEC))) |
| 678 | ? 0 : EACCES); |
| 679 | } |
| 680 | |
| 681 | /* |
| 682 | * if the file is a directory, and we are checking exec (eg lookup) |
| 683 | * access, and the file is in the namecache, then the user must have |
| 684 | * lookup access to it. |
| 685 | */ |
| 686 | if (coda_access_cache) { |
| 687 | if ((vp->v_type == VDIR) && (mode & VEXEC)) { |
| 688 | if (coda_nc_lookup(cp, "." , 1, cred)) { |
| 689 | MARK_INT_SAT(CODA_ACCESS_STATS); |
| 690 | return(0); /* it was in the cache */ |
| 691 | } |
| 692 | } |
| 693 | } |
| 694 | |
| 695 | error = venus_access(vtomi(vp), &cp->c_fid, mode, cred, curlwp); |
| 696 | |
| 697 | return(error); |
| 698 | } |
| 699 | |
| 700 | /* |
| 701 | * CODA abort op, called after namei() when a CREATE/DELETE isn't actually |
| 702 | * done. If a buffer has been saved in anticipation of a coda_create or |
| 703 | * a coda_remove, delete it. |
| 704 | */ |
| 705 | /* ARGSUSED */ |
| 706 | int |
| 707 | coda_abortop(void *v) |
| 708 | { |
| 709 | /* true args */ |
| 710 | struct vop_abortop_args /* { |
| 711 | vnode_t *a_dvp; |
| 712 | struct componentname *a_cnp; |
| 713 | } */ *ap = v; |
| 714 | |
| 715 | (void)ap; |
| 716 | /* upcall decl */ |
| 717 | /* locals */ |
| 718 | |
| 719 | return (0); |
| 720 | } |
| 721 | |
| 722 | int |
| 723 | coda_readlink(void *v) |
| 724 | { |
| 725 | /* true args */ |
| 726 | struct vop_readlink_args *ap = v; |
| 727 | vnode_t *vp = ap->a_vp; |
| 728 | struct cnode *cp = VTOC(vp); |
| 729 | struct uio *uiop = ap->a_uio; |
| 730 | kauth_cred_t cred = ap->a_cred; |
| 731 | /* locals */ |
| 732 | struct lwp *l = curlwp; |
| 733 | int error; |
| 734 | char *str; |
| 735 | int len; |
| 736 | |
| 737 | MARK_ENTRY(CODA_READLINK_STATS); |
| 738 | |
| 739 | /* Check for readlink of control object. */ |
| 740 | if (IS_CTL_VP(vp)) { |
| 741 | MARK_INT_FAIL(CODA_READLINK_STATS); |
| 742 | return(ENOENT); |
| 743 | } |
| 744 | |
| 745 | if ((coda_symlink_cache) && (VALID_SYMLINK(cp))) { /* symlink was cached */ |
| 746 | uiop->uio_rw = UIO_READ; |
| 747 | error = uiomove(cp->c_symlink, (int)cp->c_symlen, uiop); |
| 748 | if (error) |
| 749 | MARK_INT_FAIL(CODA_READLINK_STATS); |
| 750 | else |
| 751 | MARK_INT_SAT(CODA_READLINK_STATS); |
| 752 | return(error); |
| 753 | } |
| 754 | |
| 755 | error = venus_readlink(vtomi(vp), &cp->c_fid, cred, l, &str, &len); |
| 756 | |
| 757 | if (!error) { |
| 758 | uiop->uio_rw = UIO_READ; |
| 759 | error = uiomove(str, len, uiop); |
| 760 | |
| 761 | if (coda_symlink_cache) { |
| 762 | cp->c_symlink = str; |
| 763 | cp->c_symlen = len; |
| 764 | cp->c_flags |= C_SYMLINK; |
| 765 | } else |
| 766 | CODA_FREE(str, len); |
| 767 | } |
| 768 | |
| 769 | CODADEBUG(CODA_READLINK, myprintf(("in readlink result %d\n" ,error));) |
| 770 | return(error); |
| 771 | } |
| 772 | |
| 773 | int |
| 774 | coda_fsync(void *v) |
| 775 | { |
| 776 | /* true args */ |
| 777 | struct vop_fsync_args *ap = v; |
| 778 | vnode_t *vp = ap->a_vp; |
| 779 | struct cnode *cp = VTOC(vp); |
| 780 | kauth_cred_t cred = ap->a_cred; |
| 781 | /* locals */ |
| 782 | vnode_t *convp = cp->c_ovp; |
| 783 | int error; |
| 784 | |
| 785 | MARK_ENTRY(CODA_FSYNC_STATS); |
| 786 | |
| 787 | /* Check for fsync on an unmounting object */ |
| 788 | /* The NetBSD kernel, in its infinite wisdom, can try to fsync |
| 789 | * after an unmount has been initiated. This is a Bad Thing, |
| 790 | * which we have to avoid. Not a legitimate failure for stats. |
| 791 | */ |
| 792 | if (IS_UNMOUNTING(cp)) { |
| 793 | return(ENODEV); |
| 794 | } |
| 795 | |
| 796 | /* Check for fsync of control object or unitialized cnode. */ |
| 797 | if (IS_CTL_VP(vp) || vp->v_type == VNON) { |
| 798 | MARK_INT_SAT(CODA_FSYNC_STATS); |
| 799 | return(0); |
| 800 | } |
| 801 | |
| 802 | if (convp) |
| 803 | VOP_FSYNC(convp, cred, MNT_WAIT, 0, 0); |
| 804 | |
| 805 | /* |
| 806 | * We can expect fsync on any vnode at all if venus is pruging it. |
| 807 | * Venus can't very well answer the fsync request, now can it? |
| 808 | * Hopefully, it won't have to, because hopefully, venus preserves |
| 809 | * the (possibly untrue) invariant that it never purges an open |
| 810 | * vnode. Hopefully. |
| 811 | */ |
| 812 | if (cp->c_flags & C_PURGING) { |
| 813 | return(0); |
| 814 | } |
| 815 | |
| 816 | error = venus_fsync(vtomi(vp), &cp->c_fid, cred, curlwp); |
| 817 | |
| 818 | CODADEBUG(CODA_FSYNC, myprintf(("in fsync result %d\n" ,error)); ) |
| 819 | return(error); |
| 820 | } |
| 821 | |
| 822 | /* |
| 823 | * vp is locked on entry, and we must unlock it. |
| 824 | * XXX This routine is suspect and probably needs rewriting. |
| 825 | */ |
| 826 | int |
| 827 | coda_inactive(void *v) |
| 828 | { |
| 829 | /* true args */ |
| 830 | struct vop_inactive_args *ap = v; |
| 831 | vnode_t *vp = ap->a_vp; |
| 832 | struct cnode *cp = VTOC(vp); |
| 833 | kauth_cred_t cred __unused = NULL; |
| 834 | |
| 835 | /* We don't need to send inactive to venus - DCS */ |
| 836 | MARK_ENTRY(CODA_INACTIVE_STATS); |
| 837 | |
| 838 | if (IS_CTL_VP(vp)) { |
| 839 | MARK_INT_SAT(CODA_INACTIVE_STATS); |
| 840 | VOP_UNLOCK(vp); |
| 841 | return 0; |
| 842 | } |
| 843 | |
| 844 | CODADEBUG(CODA_INACTIVE, myprintf(("in inactive, %s, vfsp %p\n" , |
| 845 | coda_f2s(&cp->c_fid), vp->v_mount));) |
| 846 | |
| 847 | if (vp->v_mount->mnt_data == NULL) { |
| 848 | myprintf(("Help! vfsp->vfs_data was NULL, but vnode %p wasn't dying\n" , vp)); |
| 849 | panic("badness in coda_inactive" ); |
| 850 | } |
| 851 | |
| 852 | #ifdef CODA_VERBOSE |
| 853 | /* Sanity checks that perhaps should be panic. */ |
| 854 | if (vp->v_usecount > 1) |
| 855 | printf("%s: %p usecount %d\n" , __func__, vp, vp->v_usecount); |
| 856 | if (cp->c_ovp != NULL) |
| 857 | printf("%s: %p ovp != NULL\n" , __func__, vp); |
| 858 | #endif |
| 859 | /* XXX Do we need to VOP_CLOSE container vnodes? */ |
| 860 | VOP_UNLOCK(vp); |
| 861 | if (!IS_UNMOUNTING(cp)) |
| 862 | *ap->a_recycle = true; |
| 863 | |
| 864 | MARK_INT_SAT(CODA_INACTIVE_STATS); |
| 865 | return(0); |
| 866 | } |
| 867 | |
| 868 | /* |
| 869 | * Coda does not use the normal namecache, but a private version. |
| 870 | * Consider how to use the standard facility instead. |
| 871 | */ |
| 872 | int |
| 873 | coda_lookup(void *v) |
| 874 | { |
| 875 | /* true args */ |
| 876 | struct vop_lookup_v2_args *ap = v; |
| 877 | /* (locked) vnode of dir in which to do lookup */ |
| 878 | vnode_t *dvp = ap->a_dvp; |
| 879 | struct cnode *dcp = VTOC(dvp); |
| 880 | /* output variable for result */ |
| 881 | vnode_t **vpp = ap->a_vpp; |
| 882 | /* name to lookup */ |
| 883 | struct componentname *cnp = ap->a_cnp; |
| 884 | kauth_cred_t cred = cnp->cn_cred; |
| 885 | struct lwp *l = curlwp; |
| 886 | /* locals */ |
| 887 | struct cnode *cp; |
| 888 | const char *nm = cnp->cn_nameptr; |
| 889 | int len = cnp->cn_namelen; |
| 890 | CodaFid VFid; |
| 891 | int vtype; |
| 892 | int error = 0; |
| 893 | |
| 894 | MARK_ENTRY(CODA_LOOKUP_STATS); |
| 895 | |
| 896 | CODADEBUG(CODA_LOOKUP, myprintf(("%s: %s in %s\n" , __func__, |
| 897 | nm, coda_f2s(&dcp->c_fid)));) |
| 898 | |
| 899 | /* |
| 900 | * XXX componentname flags in MODMASK are not handled at all |
| 901 | */ |
| 902 | |
| 903 | /* |
| 904 | * The overall strategy is to switch on the lookup type and get a |
| 905 | * result vnode that is vref'd but not locked. |
| 906 | */ |
| 907 | |
| 908 | /* Check for lookup of control object. */ |
| 909 | if (IS_CTL_NAME(dvp, nm, len)) { |
| 910 | *vpp = coda_ctlvp; |
| 911 | vref(*vpp); |
| 912 | MARK_INT_SAT(CODA_LOOKUP_STATS); |
| 913 | goto exit; |
| 914 | } |
| 915 | |
| 916 | /* Avoid trying to hand venus an unreasonably long name. */ |
| 917 | if (len+1 > CODA_MAXNAMLEN) { |
| 918 | MARK_INT_FAIL(CODA_LOOKUP_STATS); |
| 919 | CODADEBUG(CODA_LOOKUP, myprintf(("%s: name too long:, %s (%s)\n" , |
| 920 | __func__, coda_f2s(&dcp->c_fid), nm));) |
| 921 | *vpp = (vnode_t *)0; |
| 922 | error = EINVAL; |
| 923 | goto exit; |
| 924 | } |
| 925 | |
| 926 | /* |
| 927 | * Try to resolve the lookup in the minicache. If that fails, ask |
| 928 | * venus to do the lookup. XXX The interaction between vnode |
| 929 | * locking and any locking that coda does is not clear. |
| 930 | */ |
| 931 | cp = coda_nc_lookup(dcp, nm, len, cred); |
| 932 | if (cp) { |
| 933 | *vpp = CTOV(cp); |
| 934 | vref(*vpp); |
| 935 | CODADEBUG(CODA_LOOKUP, |
| 936 | myprintf(("lookup result %d vpp %p\n" ,error,*vpp));) |
| 937 | } else { |
| 938 | /* The name wasn't cached, so ask Venus. */ |
| 939 | error = venus_lookup(vtomi(dvp), &dcp->c_fid, nm, len, cred, l, &VFid, |
| 940 | &vtype); |
| 941 | |
| 942 | if (error) { |
| 943 | MARK_INT_FAIL(CODA_LOOKUP_STATS); |
| 944 | CODADEBUG(CODA_LOOKUP, myprintf(("%s: lookup error on %s (%s)%d\n" , |
| 945 | __func__, coda_f2s(&dcp->c_fid), nm, error));) |
| 946 | *vpp = (vnode_t *)0; |
| 947 | } else { |
| 948 | MARK_INT_SAT(CODA_LOOKUP_STATS); |
| 949 | CODADEBUG(CODA_LOOKUP, myprintf(("%s: %s type %o result %d\n" , |
| 950 | __func__, coda_f2s(&VFid), vtype, error)); ) |
| 951 | |
| 952 | cp = make_coda_node(&VFid, dvp->v_mount, vtype); |
| 953 | *vpp = CTOV(cp); |
| 954 | /* vpp is now vrefed. */ |
| 955 | |
| 956 | /* |
| 957 | * Unless this vnode is marked CODA_NOCACHE, enter it into |
| 958 | * the coda name cache to avoid a future venus round-trip. |
| 959 | * XXX Interaction with componentname NOCACHE is unclear. |
| 960 | */ |
| 961 | if (!(vtype & CODA_NOCACHE)) |
| 962 | coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); |
| 963 | } |
| 964 | } |
| 965 | |
| 966 | exit: |
| 967 | /* |
| 968 | * If we are creating, and this was the last name to be looked up, |
| 969 | * and the error was ENOENT, then make the leaf NULL and return |
| 970 | * success. |
| 971 | * XXX Check against new lookup rules. |
| 972 | */ |
| 973 | if (((cnp->cn_nameiop == CREATE) || (cnp->cn_nameiop == RENAME)) |
| 974 | && (cnp->cn_flags & ISLASTCN) |
| 975 | && (error == ENOENT)) |
| 976 | { |
| 977 | error = EJUSTRETURN; |
| 978 | *ap->a_vpp = NULL; |
| 979 | } |
| 980 | |
| 981 | return(error); |
| 982 | } |
| 983 | |
| 984 | /*ARGSUSED*/ |
| 985 | int |
| 986 | coda_create(void *v) |
| 987 | { |
| 988 | /* true args */ |
| 989 | struct vop_create_v3_args *ap = v; |
| 990 | vnode_t *dvp = ap->a_dvp; |
| 991 | struct cnode *dcp = VTOC(dvp); |
| 992 | struct vattr *va = ap->a_vap; |
| 993 | int exclusive = 1; |
| 994 | int mode = ap->a_vap->va_mode; |
| 995 | vnode_t **vpp = ap->a_vpp; |
| 996 | struct componentname *cnp = ap->a_cnp; |
| 997 | kauth_cred_t cred = cnp->cn_cred; |
| 998 | struct lwp *l = curlwp; |
| 999 | /* locals */ |
| 1000 | int error; |
| 1001 | struct cnode *cp; |
| 1002 | const char *nm = cnp->cn_nameptr; |
| 1003 | int len = cnp->cn_namelen; |
| 1004 | CodaFid VFid; |
| 1005 | struct vattr attr; |
| 1006 | |
| 1007 | MARK_ENTRY(CODA_CREATE_STATS); |
| 1008 | |
| 1009 | /* All creates are exclusive XXX */ |
| 1010 | /* I'm assuming the 'mode' argument is the file mode bits XXX */ |
| 1011 | |
| 1012 | /* Check for create of control object. */ |
| 1013 | if (IS_CTL_NAME(dvp, nm, len)) { |
| 1014 | *vpp = (vnode_t *)0; |
| 1015 | MARK_INT_FAIL(CODA_CREATE_STATS); |
| 1016 | return(EACCES); |
| 1017 | } |
| 1018 | |
| 1019 | error = venus_create(vtomi(dvp), &dcp->c_fid, nm, len, exclusive, mode, va, cred, l, &VFid, &attr); |
| 1020 | |
| 1021 | if (!error) { |
| 1022 | |
| 1023 | /* |
| 1024 | * XXX Violation of venus/kernel invariants is a difficult case, |
| 1025 | * but venus should not be able to cause a panic. |
| 1026 | */ |
| 1027 | /* If this is an exclusive create, panic if the file already exists. */ |
| 1028 | /* Venus should have detected the file and reported EEXIST. */ |
| 1029 | |
| 1030 | if ((exclusive == 1) && |
| 1031 | (coda_find(&VFid) != NULL)) |
| 1032 | panic("cnode existed for newly created file!" ); |
| 1033 | |
| 1034 | cp = make_coda_node(&VFid, dvp->v_mount, attr.va_type); |
| 1035 | *vpp = CTOV(cp); |
| 1036 | |
| 1037 | /* XXX vnodeops doesn't say this argument can be changed. */ |
| 1038 | /* Update va to reflect the new attributes. */ |
| 1039 | (*va) = attr; |
| 1040 | |
| 1041 | /* Update the attribute cache and mark it as valid */ |
| 1042 | if (coda_attr_cache) { |
| 1043 | VTOC(*vpp)->c_vattr = attr; |
| 1044 | VTOC(*vpp)->c_flags |= C_VATTR; |
| 1045 | } |
| 1046 | |
| 1047 | /* Invalidate parent's attr cache (modification time has changed). */ |
| 1048 | VTOC(dvp)->c_flags &= ~C_VATTR; |
| 1049 | |
| 1050 | /* enter the new vnode in the Name Cache */ |
| 1051 | coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); |
| 1052 | |
| 1053 | CODADEBUG(CODA_CREATE, myprintf(("%s: %s, result %d\n" , __func__, |
| 1054 | coda_f2s(&VFid), error)); ) |
| 1055 | } else { |
| 1056 | *vpp = (vnode_t *)0; |
| 1057 | CODADEBUG(CODA_CREATE, myprintf(("%s: create error %d\n" , __func__, |
| 1058 | error));) |
| 1059 | } |
| 1060 | |
| 1061 | if (!error) { |
| 1062 | #ifdef CODA_VERBOSE |
| 1063 | if ((cnp->cn_flags & LOCKLEAF) == 0) |
| 1064 | /* This should not happen; flags are for lookup only. */ |
| 1065 | printf("%s: LOCKLEAF not set!\n" , __func__); |
| 1066 | #endif |
| 1067 | } |
| 1068 | |
| 1069 | return(error); |
| 1070 | } |
| 1071 | |
| 1072 | int |
| 1073 | coda_remove(void *v) |
| 1074 | { |
| 1075 | /* true args */ |
| 1076 | struct vop_remove_args *ap = v; |
| 1077 | vnode_t *dvp = ap->a_dvp; |
| 1078 | struct cnode *cp = VTOC(dvp); |
| 1079 | vnode_t *vp = ap->a_vp; |
| 1080 | struct componentname *cnp = ap->a_cnp; |
| 1081 | kauth_cred_t cred = cnp->cn_cred; |
| 1082 | struct lwp *l = curlwp; |
| 1083 | /* locals */ |
| 1084 | int error; |
| 1085 | const char *nm = cnp->cn_nameptr; |
| 1086 | int len = cnp->cn_namelen; |
| 1087 | struct cnode *tp; |
| 1088 | |
| 1089 | MARK_ENTRY(CODA_REMOVE_STATS); |
| 1090 | |
| 1091 | CODADEBUG(CODA_REMOVE, myprintf(("%s: %s in %s\n" , __func__, |
| 1092 | nm, coda_f2s(&cp->c_fid)));) |
| 1093 | |
| 1094 | /* Remove the file's entry from the CODA Name Cache */ |
| 1095 | /* We're being conservative here, it might be that this person |
| 1096 | * doesn't really have sufficient access to delete the file |
| 1097 | * but we feel zapping the entry won't really hurt anyone -- dcs |
| 1098 | */ |
| 1099 | /* I'm gonna go out on a limb here. If a file and a hardlink to it |
| 1100 | * exist, and one is removed, the link count on the other will be |
| 1101 | * off by 1. We could either invalidate the attrs if cached, or |
| 1102 | * fix them. I'll try to fix them. DCS 11/8/94 |
| 1103 | */ |
| 1104 | tp = coda_nc_lookup(VTOC(dvp), nm, len, cred); |
| 1105 | if (tp) { |
| 1106 | if (VALID_VATTR(tp)) { /* If attrs are cached */ |
| 1107 | if (tp->c_vattr.va_nlink > 1) { /* If it's a hard link */ |
| 1108 | tp->c_vattr.va_nlink--; |
| 1109 | } |
| 1110 | } |
| 1111 | |
| 1112 | coda_nc_zapfile(VTOC(dvp), nm, len); |
| 1113 | /* No need to flush it if it doesn't exist! */ |
| 1114 | } |
| 1115 | /* Invalidate the parent's attr cache, the modification time has changed */ |
| 1116 | VTOC(dvp)->c_flags &= ~C_VATTR; |
| 1117 | |
| 1118 | /* Check for remove of control object. */ |
| 1119 | if (IS_CTL_NAME(dvp, nm, len)) { |
| 1120 | MARK_INT_FAIL(CODA_REMOVE_STATS); |
| 1121 | return(ENOENT); |
| 1122 | } |
| 1123 | |
| 1124 | error = venus_remove(vtomi(dvp), &cp->c_fid, nm, len, cred, l); |
| 1125 | |
| 1126 | CODADEBUG(CODA_REMOVE, myprintf(("in remove result %d\n" ,error)); ) |
| 1127 | |
| 1128 | /* |
| 1129 | * Unlock parent and child (avoiding double if "."). |
| 1130 | */ |
| 1131 | if (dvp == vp) { |
| 1132 | vrele(vp); |
| 1133 | } else { |
| 1134 | vput(vp); |
| 1135 | } |
| 1136 | vput(dvp); |
| 1137 | |
| 1138 | return(error); |
| 1139 | } |
| 1140 | |
| 1141 | /* |
| 1142 | * dvp is the directory where the link is to go, and is locked. |
| 1143 | * vp is the object to be linked to, and is unlocked. |
| 1144 | * At exit, we must unlock dvp, and vput dvp. |
| 1145 | */ |
| 1146 | int |
| 1147 | coda_link(void *v) |
| 1148 | { |
| 1149 | /* true args */ |
| 1150 | struct vop_link_v2_args *ap = v; |
| 1151 | vnode_t *vp = ap->a_vp; |
| 1152 | struct cnode *cp = VTOC(vp); |
| 1153 | vnode_t *dvp = ap->a_dvp; |
| 1154 | struct cnode *dcp = VTOC(dvp); |
| 1155 | struct componentname *cnp = ap->a_cnp; |
| 1156 | kauth_cred_t cred = cnp->cn_cred; |
| 1157 | struct lwp *l = curlwp; |
| 1158 | /* locals */ |
| 1159 | int error; |
| 1160 | const char *nm = cnp->cn_nameptr; |
| 1161 | int len = cnp->cn_namelen; |
| 1162 | |
| 1163 | MARK_ENTRY(CODA_LINK_STATS); |
| 1164 | |
| 1165 | if (codadebug & CODADBGMSK(CODA_LINK)) { |
| 1166 | |
| 1167 | myprintf(("%s: vp fid: %s\n" , __func__, coda_f2s(&cp->c_fid))); |
| 1168 | myprintf(("%s: dvp fid: %s)\n" , __func__, coda_f2s(&dcp->c_fid))); |
| 1169 | |
| 1170 | } |
| 1171 | if (codadebug & CODADBGMSK(CODA_LINK)) { |
| 1172 | myprintf(("%s: vp fid: %s\n" , __func__, coda_f2s(&cp->c_fid))); |
| 1173 | myprintf(("%s: dvp fid: %s\n" , __func__, coda_f2s(&dcp->c_fid))); |
| 1174 | |
| 1175 | } |
| 1176 | |
| 1177 | /* Check for link to/from control object. */ |
| 1178 | if (IS_CTL_NAME(dvp, nm, len) || IS_CTL_VP(vp)) { |
| 1179 | MARK_INT_FAIL(CODA_LINK_STATS); |
| 1180 | return(EACCES); |
| 1181 | } |
| 1182 | |
| 1183 | /* If linking . to a name, error out earlier. */ |
| 1184 | if (vp == dvp) { |
| 1185 | #ifdef CODA_VERBOSE |
| 1186 | printf("%s coda_link vp==dvp\n" , __func__); |
| 1187 | #endif |
| 1188 | error = EISDIR; |
| 1189 | goto exit; |
| 1190 | } |
| 1191 | |
| 1192 | /* XXX Why does venus_link need the vnode to be locked?*/ |
| 1193 | if ((error = vn_lock(vp, LK_EXCLUSIVE)) != 0) { |
| 1194 | #ifdef CODA_VERBOSE |
| 1195 | printf("%s: couldn't lock vnode %p\n" , __func__, vp); |
| 1196 | #endif |
| 1197 | error = EFAULT; /* XXX better value */ |
| 1198 | goto exit; |
| 1199 | } |
| 1200 | error = venus_link(vtomi(vp), &cp->c_fid, &dcp->c_fid, nm, len, cred, l); |
| 1201 | VOP_UNLOCK(vp); |
| 1202 | |
| 1203 | /* Invalidate parent's attr cache (the modification time has changed). */ |
| 1204 | VTOC(dvp)->c_flags &= ~C_VATTR; |
| 1205 | /* Invalidate child's attr cache (XXX why). */ |
| 1206 | VTOC(vp)->c_flags &= ~C_VATTR; |
| 1207 | |
| 1208 | CODADEBUG(CODA_LINK, myprintf(("in link result %d\n" ,error)); ) |
| 1209 | |
| 1210 | exit: |
| 1211 | return(error); |
| 1212 | } |
| 1213 | |
| 1214 | int |
| 1215 | coda_rename(void *v) |
| 1216 | { |
| 1217 | /* true args */ |
| 1218 | struct vop_rename_args *ap = v; |
| 1219 | vnode_t *odvp = ap->a_fdvp; |
| 1220 | struct cnode *odcp = VTOC(odvp); |
| 1221 | struct componentname *fcnp = ap->a_fcnp; |
| 1222 | vnode_t *ndvp = ap->a_tdvp; |
| 1223 | struct cnode *ndcp = VTOC(ndvp); |
| 1224 | struct componentname *tcnp = ap->a_tcnp; |
| 1225 | kauth_cred_t cred = fcnp->cn_cred; |
| 1226 | struct lwp *l = curlwp; |
| 1227 | /* true args */ |
| 1228 | int error; |
| 1229 | const char *fnm = fcnp->cn_nameptr; |
| 1230 | int flen = fcnp->cn_namelen; |
| 1231 | const char *tnm = tcnp->cn_nameptr; |
| 1232 | int tlen = tcnp->cn_namelen; |
| 1233 | |
| 1234 | MARK_ENTRY(CODA_RENAME_STATS); |
| 1235 | |
| 1236 | /* Hmmm. The vnodes are already looked up. Perhaps they are locked? |
| 1237 | This could be Bad. XXX */ |
| 1238 | #ifdef OLD_DIAGNOSTIC |
| 1239 | if ((fcnp->cn_cred != tcnp->cn_cred) |
| 1240 | || (fcnp->cn_lwp != tcnp->cn_lwp)) |
| 1241 | { |
| 1242 | panic("%s: component names don't agree" , __func__); |
| 1243 | } |
| 1244 | #endif |
| 1245 | |
| 1246 | /* Check for rename involving control object. */ |
| 1247 | if (IS_CTL_NAME(odvp, fnm, flen) || IS_CTL_NAME(ndvp, tnm, tlen)) { |
| 1248 | MARK_INT_FAIL(CODA_RENAME_STATS); |
| 1249 | return(EACCES); |
| 1250 | } |
| 1251 | |
| 1252 | /* Problem with moving directories -- need to flush entry for .. */ |
| 1253 | if (odvp != ndvp) { |
| 1254 | struct cnode *ovcp = coda_nc_lookup(VTOC(odvp), fnm, flen, cred); |
| 1255 | if (ovcp) { |
| 1256 | vnode_t *ovp = CTOV(ovcp); |
| 1257 | if ((ovp) && |
| 1258 | (ovp->v_type == VDIR)) /* If it's a directory */ |
| 1259 | coda_nc_zapfile(VTOC(ovp),".." , 2); |
| 1260 | } |
| 1261 | } |
| 1262 | |
| 1263 | /* Remove the entries for both source and target files */ |
| 1264 | coda_nc_zapfile(VTOC(odvp), fnm, flen); |
| 1265 | coda_nc_zapfile(VTOC(ndvp), tnm, tlen); |
| 1266 | |
| 1267 | /* Invalidate the parent's attr cache, the modification time has changed */ |
| 1268 | VTOC(odvp)->c_flags &= ~C_VATTR; |
| 1269 | VTOC(ndvp)->c_flags &= ~C_VATTR; |
| 1270 | |
| 1271 | if (flen+1 > CODA_MAXNAMLEN) { |
| 1272 | MARK_INT_FAIL(CODA_RENAME_STATS); |
| 1273 | error = EINVAL; |
| 1274 | goto exit; |
| 1275 | } |
| 1276 | |
| 1277 | if (tlen+1 > CODA_MAXNAMLEN) { |
| 1278 | MARK_INT_FAIL(CODA_RENAME_STATS); |
| 1279 | error = EINVAL; |
| 1280 | goto exit; |
| 1281 | } |
| 1282 | |
| 1283 | error = venus_rename(vtomi(odvp), &odcp->c_fid, &ndcp->c_fid, fnm, flen, tnm, tlen, cred, l); |
| 1284 | |
| 1285 | exit: |
| 1286 | CODADEBUG(CODA_RENAME, myprintf(("in rename result %d\n" ,error));) |
| 1287 | /* XXX - do we need to call cache pureg on the moved vnode? */ |
| 1288 | cache_purge(ap->a_fvp); |
| 1289 | |
| 1290 | /* It seems to be incumbent on us to drop locks on all four vnodes */ |
| 1291 | /* From-vnodes are not locked, only ref'd. To-vnodes are locked. */ |
| 1292 | |
| 1293 | vrele(ap->a_fvp); |
| 1294 | vrele(odvp); |
| 1295 | |
| 1296 | if (ap->a_tvp) { |
| 1297 | if (ap->a_tvp == ndvp) { |
| 1298 | vrele(ap->a_tvp); |
| 1299 | } else { |
| 1300 | vput(ap->a_tvp); |
| 1301 | } |
| 1302 | } |
| 1303 | |
| 1304 | vput(ndvp); |
| 1305 | return(error); |
| 1306 | } |
| 1307 | |
| 1308 | int |
| 1309 | coda_mkdir(void *v) |
| 1310 | { |
| 1311 | /* true args */ |
| 1312 | struct vop_mkdir_v3_args *ap = v; |
| 1313 | vnode_t *dvp = ap->a_dvp; |
| 1314 | struct cnode *dcp = VTOC(dvp); |
| 1315 | struct componentname *cnp = ap->a_cnp; |
| 1316 | struct vattr *va = ap->a_vap; |
| 1317 | vnode_t **vpp = ap->a_vpp; |
| 1318 | kauth_cred_t cred = cnp->cn_cred; |
| 1319 | struct lwp *l = curlwp; |
| 1320 | /* locals */ |
| 1321 | int error; |
| 1322 | const char *nm = cnp->cn_nameptr; |
| 1323 | int len = cnp->cn_namelen; |
| 1324 | struct cnode *cp; |
| 1325 | CodaFid VFid; |
| 1326 | struct vattr ova; |
| 1327 | |
| 1328 | MARK_ENTRY(CODA_MKDIR_STATS); |
| 1329 | |
| 1330 | /* Check for mkdir of target object. */ |
| 1331 | if (IS_CTL_NAME(dvp, nm, len)) { |
| 1332 | *vpp = (vnode_t *)0; |
| 1333 | MARK_INT_FAIL(CODA_MKDIR_STATS); |
| 1334 | return(EACCES); |
| 1335 | } |
| 1336 | |
| 1337 | if (len+1 > CODA_MAXNAMLEN) { |
| 1338 | *vpp = (vnode_t *)0; |
| 1339 | MARK_INT_FAIL(CODA_MKDIR_STATS); |
| 1340 | return(EACCES); |
| 1341 | } |
| 1342 | |
| 1343 | error = venus_mkdir(vtomi(dvp), &dcp->c_fid, nm, len, va, cred, l, &VFid, &ova); |
| 1344 | |
| 1345 | if (!error) { |
| 1346 | if (coda_find(&VFid) != NULL) |
| 1347 | panic("cnode existed for newly created directory!" ); |
| 1348 | |
| 1349 | |
| 1350 | cp = make_coda_node(&VFid, dvp->v_mount, va->va_type); |
| 1351 | *vpp = CTOV(cp); |
| 1352 | |
| 1353 | /* enter the new vnode in the Name Cache */ |
| 1354 | coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); |
| 1355 | |
| 1356 | /* as a side effect, enter "." and ".." for the directory */ |
| 1357 | coda_nc_enter(VTOC(*vpp), "." , 1, cred, VTOC(*vpp)); |
| 1358 | coda_nc_enter(VTOC(*vpp), ".." , 2, cred, VTOC(dvp)); |
| 1359 | |
| 1360 | if (coda_attr_cache) { |
| 1361 | VTOC(*vpp)->c_vattr = ova; /* update the attr cache */ |
| 1362 | VTOC(*vpp)->c_flags |= C_VATTR; /* Valid attributes in cnode */ |
| 1363 | } |
| 1364 | |
| 1365 | /* Invalidate the parent's attr cache, the modification time has changed */ |
| 1366 | VTOC(dvp)->c_flags &= ~C_VATTR; |
| 1367 | |
| 1368 | CODADEBUG( CODA_MKDIR, myprintf(("%s: %s result %d\n" , __func__, |
| 1369 | coda_f2s(&VFid), error)); ) |
| 1370 | } else { |
| 1371 | *vpp = (vnode_t *)0; |
| 1372 | CODADEBUG(CODA_MKDIR, myprintf(("%s error %d\n" , __func__, error));) |
| 1373 | } |
| 1374 | |
| 1375 | return(error); |
| 1376 | } |
| 1377 | |
| 1378 | int |
| 1379 | coda_rmdir(void *v) |
| 1380 | { |
| 1381 | /* true args */ |
| 1382 | struct vop_rmdir_args *ap = v; |
| 1383 | vnode_t *dvp = ap->a_dvp; |
| 1384 | struct cnode *dcp = VTOC(dvp); |
| 1385 | vnode_t *vp = ap->a_vp; |
| 1386 | struct componentname *cnp = ap->a_cnp; |
| 1387 | kauth_cred_t cred = cnp->cn_cred; |
| 1388 | struct lwp *l = curlwp; |
| 1389 | /* true args */ |
| 1390 | int error; |
| 1391 | const char *nm = cnp->cn_nameptr; |
| 1392 | int len = cnp->cn_namelen; |
| 1393 | struct cnode *cp; |
| 1394 | |
| 1395 | MARK_ENTRY(CODA_RMDIR_STATS); |
| 1396 | |
| 1397 | /* Check for rmdir of control object. */ |
| 1398 | if (IS_CTL_NAME(dvp, nm, len)) { |
| 1399 | MARK_INT_FAIL(CODA_RMDIR_STATS); |
| 1400 | return(ENOENT); |
| 1401 | } |
| 1402 | |
| 1403 | /* Can't remove . in self. */ |
| 1404 | if (dvp == vp) { |
| 1405 | #ifdef CODA_VERBOSE |
| 1406 | printf("%s: dvp == vp\n" , __func__); |
| 1407 | #endif |
| 1408 | error = EINVAL; |
| 1409 | goto exit; |
| 1410 | } |
| 1411 | |
| 1412 | /* |
| 1413 | * The caller may not have adequate permissions, and the venus |
| 1414 | * operation may fail, but it doesn't hurt from a correctness |
| 1415 | * viewpoint to invalidate cache entries. |
| 1416 | * XXX Why isn't this done after the venus_rmdir call? |
| 1417 | */ |
| 1418 | /* Look up child in name cache (by name, from parent). */ |
| 1419 | cp = coda_nc_lookup(dcp, nm, len, cred); |
| 1420 | /* If found, remove all children of the child (., ..). */ |
| 1421 | if (cp) coda_nc_zapParentfid(&(cp->c_fid), NOT_DOWNCALL); |
| 1422 | |
| 1423 | /* Remove child's own entry. */ |
| 1424 | coda_nc_zapfile(dcp, nm, len); |
| 1425 | |
| 1426 | /* Invalidate parent's attr cache (the modification time has changed). */ |
| 1427 | dcp->c_flags &= ~C_VATTR; |
| 1428 | |
| 1429 | error = venus_rmdir(vtomi(dvp), &dcp->c_fid, nm, len, cred, l); |
| 1430 | |
| 1431 | CODADEBUG(CODA_RMDIR, myprintf(("in rmdir result %d\n" , error)); ) |
| 1432 | |
| 1433 | exit: |
| 1434 | /* vput both vnodes */ |
| 1435 | vput(dvp); |
| 1436 | if (dvp == vp) { |
| 1437 | vrele(vp); |
| 1438 | } else { |
| 1439 | vput(vp); |
| 1440 | } |
| 1441 | |
| 1442 | return(error); |
| 1443 | } |
| 1444 | |
| 1445 | int |
| 1446 | coda_symlink(void *v) |
| 1447 | { |
| 1448 | /* true args */ |
| 1449 | struct vop_symlink_v3_args *ap = v; |
| 1450 | vnode_t *dvp = ap->a_dvp; |
| 1451 | struct cnode *dcp = VTOC(dvp); |
| 1452 | /* a_vpp is used in place below */ |
| 1453 | struct componentname *cnp = ap->a_cnp; |
| 1454 | struct vattr *tva = ap->a_vap; |
| 1455 | char *path = ap->a_target; |
| 1456 | kauth_cred_t cred = cnp->cn_cred; |
| 1457 | struct lwp *l = curlwp; |
| 1458 | /* locals */ |
| 1459 | int error; |
| 1460 | u_long saved_cn_flags; |
| 1461 | const char *nm = cnp->cn_nameptr; |
| 1462 | int len = cnp->cn_namelen; |
| 1463 | int plen = strlen(path); |
| 1464 | |
| 1465 | /* |
| 1466 | * Here's the strategy for the moment: perform the symlink, then |
| 1467 | * do a lookup to grab the resulting vnode. I know this requires |
| 1468 | * two communications with Venus for a new sybolic link, but |
| 1469 | * that's the way the ball bounces. I don't yet want to change |
| 1470 | * the way the Mach symlink works. When Mach support is |
| 1471 | * deprecated, we should change symlink so that the common case |
| 1472 | * returns the resultant vnode in a vpp argument. |
| 1473 | */ |
| 1474 | |
| 1475 | MARK_ENTRY(CODA_SYMLINK_STATS); |
| 1476 | |
| 1477 | /* Check for symlink of control object. */ |
| 1478 | if (IS_CTL_NAME(dvp, nm, len)) { |
| 1479 | MARK_INT_FAIL(CODA_SYMLINK_STATS); |
| 1480 | error = EACCES; |
| 1481 | goto exit; |
| 1482 | } |
| 1483 | |
| 1484 | if (plen+1 > CODA_MAXPATHLEN) { |
| 1485 | MARK_INT_FAIL(CODA_SYMLINK_STATS); |
| 1486 | error = EINVAL; |
| 1487 | goto exit; |
| 1488 | } |
| 1489 | |
| 1490 | if (len+1 > CODA_MAXNAMLEN) { |
| 1491 | MARK_INT_FAIL(CODA_SYMLINK_STATS); |
| 1492 | error = EINVAL; |
| 1493 | goto exit; |
| 1494 | } |
| 1495 | |
| 1496 | error = venus_symlink(vtomi(dvp), &dcp->c_fid, path, plen, nm, len, tva, cred, l); |
| 1497 | |
| 1498 | /* Invalidate the parent's attr cache (modification time has changed). */ |
| 1499 | dcp->c_flags &= ~C_VATTR; |
| 1500 | |
| 1501 | if (!error) { |
| 1502 | /* |
| 1503 | * VOP_SYMLINK is not defined to pay attention to cnp->cn_flags; |
| 1504 | * these are defined only for VOP_LOOKUP. We desire to reuse |
| 1505 | * cnp for a VOP_LOOKUP operation, and must be sure to not pass |
| 1506 | * stray flags passed to us. Such stray flags can occur because |
| 1507 | * sys_symlink makes a namei call and then reuses the |
| 1508 | * componentname structure. |
| 1509 | */ |
| 1510 | /* |
| 1511 | * XXX Arguably we should create our own componentname structure |
| 1512 | * and not reuse the one that was passed in. |
| 1513 | */ |
| 1514 | saved_cn_flags = cnp->cn_flags; |
| 1515 | cnp->cn_flags &= ~(MODMASK | OPMASK); |
| 1516 | cnp->cn_flags |= LOOKUP; |
| 1517 | error = VOP_LOOKUP(dvp, ap->a_vpp, cnp); |
| 1518 | cnp->cn_flags = saved_cn_flags; |
| 1519 | } |
| 1520 | |
| 1521 | exit: |
| 1522 | CODADEBUG(CODA_SYMLINK, myprintf(("in symlink result %d\n" ,error)); ) |
| 1523 | return(error); |
| 1524 | } |
| 1525 | |
| 1526 | /* |
| 1527 | * Read directory entries. |
| 1528 | */ |
| 1529 | int |
| 1530 | coda_readdir(void *v) |
| 1531 | { |
| 1532 | /* true args */ |
| 1533 | struct vop_readdir_args *ap = v; |
| 1534 | vnode_t *vp = ap->a_vp; |
| 1535 | struct cnode *cp = VTOC(vp); |
| 1536 | struct uio *uiop = ap->a_uio; |
| 1537 | kauth_cred_t cred = ap->a_cred; |
| 1538 | int *eofflag = ap->a_eofflag; |
| 1539 | off_t **cookies = ap->a_cookies; |
| 1540 | int *ncookies = ap->a_ncookies; |
| 1541 | /* upcall decl */ |
| 1542 | /* locals */ |
| 1543 | int error = 0; |
| 1544 | |
| 1545 | MARK_ENTRY(CODA_READDIR_STATS); |
| 1546 | |
| 1547 | CODADEBUG(CODA_READDIR, myprintf(("%s: (%p, %lu, %lld)\n" , __func__, |
| 1548 | uiop->uio_iov->iov_base, (unsigned long) uiop->uio_resid, |
| 1549 | (long long) uiop->uio_offset)); ) |
| 1550 | |
| 1551 | /* Check for readdir of control object. */ |
| 1552 | if (IS_CTL_VP(vp)) { |
| 1553 | MARK_INT_FAIL(CODA_READDIR_STATS); |
| 1554 | return(ENOENT); |
| 1555 | } |
| 1556 | |
| 1557 | { |
| 1558 | /* Redirect the request to UFS. */ |
| 1559 | |
| 1560 | /* If directory is not already open do an "internal open" on it. */ |
| 1561 | int opened_internally = 0; |
| 1562 | if (cp->c_ovp == NULL) { |
| 1563 | opened_internally = 1; |
| 1564 | MARK_INT_GEN(CODA_OPEN_STATS); |
| 1565 | error = VOP_OPEN(vp, FREAD, cred); |
| 1566 | #ifdef CODA_VERBOSE |
| 1567 | printf("%s: Internally Opening %p\n" , __func__, vp); |
| 1568 | #endif |
| 1569 | if (error) return(error); |
| 1570 | } else |
| 1571 | vp = cp->c_ovp; |
| 1572 | |
| 1573 | /* Have UFS handle the call. */ |
| 1574 | CODADEBUG(CODA_READDIR, myprintf(("%s: fid = %s, refcnt = %d\n" , |
| 1575 | __func__, coda_f2s(&cp->c_fid), vp->v_usecount)); ) |
| 1576 | error = VOP_READDIR(vp, uiop, cred, eofflag, cookies, ncookies); |
| 1577 | if (error) |
| 1578 | MARK_INT_FAIL(CODA_READDIR_STATS); |
| 1579 | else |
| 1580 | MARK_INT_SAT(CODA_READDIR_STATS); |
| 1581 | |
| 1582 | /* Do an "internal close" if necessary. */ |
| 1583 | if (opened_internally) { |
| 1584 | MARK_INT_GEN(CODA_CLOSE_STATS); |
| 1585 | (void)VOP_CLOSE(vp, FREAD, cred); |
| 1586 | } |
| 1587 | } |
| 1588 | |
| 1589 | return(error); |
| 1590 | } |
| 1591 | |
| 1592 | /* |
| 1593 | * Convert from file system blocks to device blocks |
| 1594 | */ |
| 1595 | int |
| 1596 | coda_bmap(void *v) |
| 1597 | { |
| 1598 | /* XXX on the global proc */ |
| 1599 | /* true args */ |
| 1600 | struct vop_bmap_args *ap = v; |
| 1601 | vnode_t *vp __unused = ap->a_vp; /* file's vnode */ |
| 1602 | daddr_t bn __unused = ap->a_bn; /* fs block number */ |
| 1603 | vnode_t **vpp = ap->a_vpp; /* RETURN vp of device */ |
| 1604 | daddr_t *bnp __unused = ap->a_bnp; /* RETURN device block number */ |
| 1605 | struct lwp *l __unused = curlwp; |
| 1606 | /* upcall decl */ |
| 1607 | /* locals */ |
| 1608 | |
| 1609 | *vpp = (vnode_t *)0; |
| 1610 | myprintf(("coda_bmap called!\n" )); |
| 1611 | return(EINVAL); |
| 1612 | } |
| 1613 | |
| 1614 | /* |
| 1615 | * I don't think the following two things are used anywhere, so I've |
| 1616 | * commented them out |
| 1617 | * |
| 1618 | * struct buf *async_bufhead; |
| 1619 | * int async_daemon_count; |
| 1620 | */ |
| 1621 | int |
| 1622 | coda_strategy(void *v) |
| 1623 | { |
| 1624 | /* true args */ |
| 1625 | struct vop_strategy_args *ap = v; |
| 1626 | struct buf *bp __unused = ap->a_bp; |
| 1627 | struct lwp *l __unused = curlwp; |
| 1628 | /* upcall decl */ |
| 1629 | /* locals */ |
| 1630 | |
| 1631 | myprintf(("coda_strategy called! " )); |
| 1632 | return(EINVAL); |
| 1633 | } |
| 1634 | |
| 1635 | int |
| 1636 | coda_reclaim(void *v) |
| 1637 | { |
| 1638 | /* true args */ |
| 1639 | struct vop_reclaim_args *ap = v; |
| 1640 | vnode_t *vp = ap->a_vp; |
| 1641 | struct cnode *cp = VTOC(vp); |
| 1642 | /* upcall decl */ |
| 1643 | /* locals */ |
| 1644 | |
| 1645 | /* |
| 1646 | * Forced unmount/flush will let vnodes with non zero use be destroyed! |
| 1647 | */ |
| 1648 | ENTRY; |
| 1649 | |
| 1650 | if (IS_UNMOUNTING(cp)) { |
| 1651 | #ifdef DEBUG |
| 1652 | if (VTOC(vp)->c_ovp) { |
| 1653 | if (IS_UNMOUNTING(cp)) |
| 1654 | printf("%s: c_ovp not void: vp %p, cp %p\n" , __func__, vp, cp); |
| 1655 | } |
| 1656 | #endif |
| 1657 | } else { |
| 1658 | #ifdef OLD_DIAGNOSTIC |
| 1659 | if (vp->v_usecount != 0) |
| 1660 | print("%s: pushing active %p\n" , __func__, vp); |
| 1661 | if (VTOC(vp)->c_ovp) { |
| 1662 | panic("%s: c_ovp not void" , __func__); |
| 1663 | } |
| 1664 | #endif |
| 1665 | } |
| 1666 | /* If an array has been allocated to hold the symlink, deallocate it */ |
| 1667 | if ((coda_symlink_cache) && (VALID_SYMLINK(cp))) { |
| 1668 | if (cp->c_symlink == NULL) |
| 1669 | panic("%s: null symlink pointer in cnode" , __func__); |
| 1670 | |
| 1671 | CODA_FREE(cp->c_symlink, cp->c_symlen); |
| 1672 | cp->c_flags &= ~C_SYMLINK; |
| 1673 | cp->c_symlen = 0; |
| 1674 | } |
| 1675 | |
| 1676 | mutex_enter(vp->v_interlock); |
| 1677 | mutex_enter(&cp->c_lock); |
| 1678 | SET_VTOC(vp) = NULL; |
| 1679 | mutex_exit(&cp->c_lock); |
| 1680 | mutex_exit(vp->v_interlock); |
| 1681 | mutex_destroy(&cp->c_lock); |
| 1682 | kmem_free(cp, sizeof(*cp)); |
| 1683 | |
| 1684 | return (0); |
| 1685 | } |
| 1686 | |
| 1687 | int |
| 1688 | coda_lock(void *v) |
| 1689 | { |
| 1690 | /* true args */ |
| 1691 | struct vop_lock_args *ap = v; |
| 1692 | vnode_t *vp = ap->a_vp; |
| 1693 | struct cnode *cp = VTOC(vp); |
| 1694 | /* upcall decl */ |
| 1695 | /* locals */ |
| 1696 | |
| 1697 | ENTRY; |
| 1698 | |
| 1699 | if (coda_lockdebug) { |
| 1700 | myprintf(("Attempting lock on %s\n" , |
| 1701 | coda_f2s(&cp->c_fid))); |
| 1702 | } |
| 1703 | |
| 1704 | return genfs_lock(v); |
| 1705 | } |
| 1706 | |
| 1707 | int |
| 1708 | coda_unlock(void *v) |
| 1709 | { |
| 1710 | /* true args */ |
| 1711 | struct vop_unlock_args *ap = v; |
| 1712 | vnode_t *vp = ap->a_vp; |
| 1713 | struct cnode *cp = VTOC(vp); |
| 1714 | /* upcall decl */ |
| 1715 | /* locals */ |
| 1716 | |
| 1717 | ENTRY; |
| 1718 | if (coda_lockdebug) { |
| 1719 | myprintf(("Attempting unlock on %s\n" , |
| 1720 | coda_f2s(&cp->c_fid))); |
| 1721 | } |
| 1722 | |
| 1723 | return genfs_unlock(v); |
| 1724 | } |
| 1725 | |
| 1726 | int |
| 1727 | coda_islocked(void *v) |
| 1728 | { |
| 1729 | /* true args */ |
| 1730 | ENTRY; |
| 1731 | |
| 1732 | return genfs_islocked(v); |
| 1733 | } |
| 1734 | |
| 1735 | /* |
| 1736 | * Given a device and inode, obtain a locked vnode. One reference is |
| 1737 | * obtained and passed back to the caller. |
| 1738 | */ |
| 1739 | int |
| 1740 | coda_grab_vnode(vnode_t *uvp, dev_t dev, ino_t ino, vnode_t **vpp) |
| 1741 | { |
| 1742 | int error; |
| 1743 | struct mount *mp; |
| 1744 | |
| 1745 | /* Obtain mount point structure from device. */ |
| 1746 | if (!(mp = devtomp(dev))) { |
| 1747 | myprintf(("%s: devtomp(0x%llx) returns NULL\n" , __func__, |
| 1748 | (unsigned long long)dev)); |
| 1749 | return(ENXIO); |
| 1750 | } |
| 1751 | |
| 1752 | /* |
| 1753 | * Obtain vnode from mount point and inode. |
| 1754 | */ |
| 1755 | error = VFS_VGET(mp, ino, vpp); |
| 1756 | if (error) { |
| 1757 | myprintf(("%s: iget/vget(0x%llx, %llu) returns %p, err %d\n" , __func__, |
| 1758 | (unsigned long long)dev, (unsigned long long)ino, *vpp, error)); |
| 1759 | return(ENOENT); |
| 1760 | } |
| 1761 | /* share the underlying vnode lock with the coda vnode */ |
| 1762 | mutex_obj_hold((*vpp)->v_interlock); |
| 1763 | uvm_obj_setlock(&uvp->v_uobj, (*vpp)->v_interlock); |
| 1764 | KASSERT(VOP_ISLOCKED(*vpp)); |
| 1765 | return(0); |
| 1766 | } |
| 1767 | |
| 1768 | static void |
| 1769 | coda_print_vattr(struct vattr *attr) |
| 1770 | { |
| 1771 | const char *typestr; |
| 1772 | |
| 1773 | switch (attr->va_type) { |
| 1774 | case VNON: |
| 1775 | typestr = "VNON" ; |
| 1776 | break; |
| 1777 | case VREG: |
| 1778 | typestr = "VREG" ; |
| 1779 | break; |
| 1780 | case VDIR: |
| 1781 | typestr = "VDIR" ; |
| 1782 | break; |
| 1783 | case VBLK: |
| 1784 | typestr = "VBLK" ; |
| 1785 | break; |
| 1786 | case VCHR: |
| 1787 | typestr = "VCHR" ; |
| 1788 | break; |
| 1789 | case VLNK: |
| 1790 | typestr = "VLNK" ; |
| 1791 | break; |
| 1792 | case VSOCK: |
| 1793 | typestr = "VSCK" ; |
| 1794 | break; |
| 1795 | case VFIFO: |
| 1796 | typestr = "VFFO" ; |
| 1797 | break; |
| 1798 | case VBAD: |
| 1799 | typestr = "VBAD" ; |
| 1800 | break; |
| 1801 | default: |
| 1802 | typestr = "????" ; |
| 1803 | break; |
| 1804 | } |
| 1805 | |
| 1806 | |
| 1807 | myprintf(("attr: type %s mode %d uid %d gid %d fsid %d rdev %d\n" , |
| 1808 | typestr, (int)attr->va_mode, (int)attr->va_uid, |
| 1809 | (int)attr->va_gid, (int)attr->va_fsid, (int)attr->va_rdev)); |
| 1810 | |
| 1811 | myprintf((" fileid %d nlink %d size %d blocksize %d bytes %d\n" , |
| 1812 | (int)attr->va_fileid, (int)attr->va_nlink, |
| 1813 | (int)attr->va_size, |
| 1814 | (int)attr->va_blocksize,(int)attr->va_bytes)); |
| 1815 | myprintf((" gen %ld flags %ld vaflags %d\n" , |
| 1816 | attr->va_gen, attr->va_flags, attr->va_vaflags)); |
| 1817 | myprintf((" atime sec %d nsec %d\n" , |
| 1818 | (int)attr->va_atime.tv_sec, (int)attr->va_atime.tv_nsec)); |
| 1819 | myprintf((" mtime sec %d nsec %d\n" , |
| 1820 | (int)attr->va_mtime.tv_sec, (int)attr->va_mtime.tv_nsec)); |
| 1821 | myprintf((" ctime sec %d nsec %d\n" , |
| 1822 | (int)attr->va_ctime.tv_sec, (int)attr->va_ctime.tv_nsec)); |
| 1823 | } |
| 1824 | |
| 1825 | /* |
| 1826 | * Return a vnode for the given fid. |
| 1827 | * If no cnode exists for this fid create one and put it |
| 1828 | * in a table hashed by coda_f2i(). If the cnode for |
| 1829 | * this fid is already in the table return it (ref count is |
| 1830 | * incremented by coda_find. The cnode will be flushed from the |
| 1831 | * table when coda_inactive calls coda_unsave. |
| 1832 | */ |
| 1833 | struct cnode * |
| 1834 | make_coda_node(CodaFid *fid, struct mount *fvsp, short type) |
| 1835 | { |
| 1836 | int error __diagused; |
| 1837 | struct vnode *vp; |
| 1838 | struct cnode *cp; |
| 1839 | |
| 1840 | error = vcache_get(fvsp, fid, sizeof(CodaFid), &vp); |
| 1841 | KASSERT(error == 0); |
| 1842 | |
| 1843 | mutex_enter(vp->v_interlock); |
| 1844 | cp = VTOC(vp); |
| 1845 | KASSERT(cp != NULL); |
| 1846 | mutex_enter(&cp->c_lock); |
| 1847 | mutex_exit(vp->v_interlock); |
| 1848 | |
| 1849 | if (vp->v_type != type) { |
| 1850 | if (vp->v_type == VCHR || vp->v_type == VBLK) |
| 1851 | spec_node_destroy(vp); |
| 1852 | vp->v_type = type; |
| 1853 | if (type == VCHR || type == VBLK) |
| 1854 | spec_node_init(vp, NODEV); |
| 1855 | uvm_vnp_setsize(vp, 0); |
| 1856 | } |
| 1857 | mutex_exit(&cp->c_lock); |
| 1858 | |
| 1859 | return cp; |
| 1860 | } |
| 1861 | |
| 1862 | /* |
| 1863 | * coda_getpages may be called on a vnode which has not been opened, |
| 1864 | * e.g. to fault in pages to execute a program. In that case, we must |
| 1865 | * open the file to get the container. The vnode may or may not be |
| 1866 | * locked, and we must leave it in the same state. |
| 1867 | */ |
| 1868 | int |
| 1869 | coda_getpages(void *v) |
| 1870 | { |
| 1871 | struct vop_getpages_args /* { |
| 1872 | vnode_t *a_vp; |
| 1873 | voff_t a_offset; |
| 1874 | struct vm_page **a_m; |
| 1875 | int *a_count; |
| 1876 | int a_centeridx; |
| 1877 | vm_prot_t a_access_type; |
| 1878 | int a_advice; |
| 1879 | int a_flags; |
| 1880 | } */ *ap = v; |
| 1881 | vnode_t *vp = ap->a_vp, *cvp; |
| 1882 | struct cnode *cp = VTOC(vp); |
| 1883 | struct lwp *l = curlwp; |
| 1884 | kauth_cred_t cred = l->l_cred; |
| 1885 | int error, cerror; |
| 1886 | int waslocked; /* 1 if vnode lock was held on entry */ |
| 1887 | int didopen = 0; /* 1 if we opened container file */ |
| 1888 | |
| 1889 | /* |
| 1890 | * Handle a case that uvm_fault doesn't quite use yet. |
| 1891 | * See layer_vnops.c. for inspiration. |
| 1892 | */ |
| 1893 | if (ap->a_flags & PGO_LOCKED) { |
| 1894 | return EBUSY; |
| 1895 | } |
| 1896 | |
| 1897 | KASSERT(mutex_owned(vp->v_interlock)); |
| 1898 | |
| 1899 | /* Check for control object. */ |
| 1900 | if (IS_CTL_VP(vp)) { |
| 1901 | #ifdef CODA_VERBOSE |
| 1902 | printf("%s: control object %p\n" , __func__, vp); |
| 1903 | #endif |
| 1904 | return(EINVAL); |
| 1905 | } |
| 1906 | |
| 1907 | /* |
| 1908 | * XXX It's really not ok to be releasing the lock we get, |
| 1909 | * because we could be overlapping with another call to |
| 1910 | * getpages and drop a lock they are relying on. We need to |
| 1911 | * figure out whether getpages ever is called holding the |
| 1912 | * lock, and if we should serialize getpages calls by some |
| 1913 | * mechanism. |
| 1914 | */ |
| 1915 | /* XXX VOP_ISLOCKED() may not be used for lock decisions. */ |
| 1916 | waslocked = VOP_ISLOCKED(vp); |
| 1917 | |
| 1918 | /* Get container file if not already present. */ |
| 1919 | cvp = cp->c_ovp; |
| 1920 | if (cvp == NULL) { |
| 1921 | /* |
| 1922 | * VOP_OPEN requires a locked vnode. We must avoid |
| 1923 | * locking the vnode if it is already locked, and |
| 1924 | * leave it in the same state on exit. |
| 1925 | */ |
| 1926 | if (waslocked == 0) { |
| 1927 | mutex_exit(vp->v_interlock); |
| 1928 | cerror = vn_lock(vp, LK_EXCLUSIVE); |
| 1929 | if (cerror) { |
| 1930 | #ifdef CODA_VERBOSE |
| 1931 | printf("%s: can't lock vnode %p\n" , |
| 1932 | __func__, vp); |
| 1933 | #endif |
| 1934 | return cerror; |
| 1935 | } |
| 1936 | #ifdef CODA_VERBOSE |
| 1937 | printf("%s: locked vnode %p\n" , __func__, vp); |
| 1938 | #endif |
| 1939 | } |
| 1940 | |
| 1941 | /* |
| 1942 | * Open file (causes upcall to venus). |
| 1943 | * XXX Perhaps we should not fully open the file, but |
| 1944 | * simply obtain a container file. |
| 1945 | */ |
| 1946 | /* XXX Is it ok to do this while holding the mutex? */ |
| 1947 | cerror = VOP_OPEN(vp, FREAD, cred); |
| 1948 | |
| 1949 | if (cerror) { |
| 1950 | #ifdef CODA_VERBOSE |
| 1951 | printf("%s: cannot open vnode %p => %d\n" , __func__, |
| 1952 | vp, cerror); |
| 1953 | #endif |
| 1954 | if (waslocked == 0) |
| 1955 | VOP_UNLOCK(vp); |
| 1956 | return cerror; |
| 1957 | } |
| 1958 | |
| 1959 | #ifdef CODA_VERBOSE |
| 1960 | printf("%s: opened vnode %p\n" , __func__, vp); |
| 1961 | #endif |
| 1962 | cvp = cp->c_ovp; |
| 1963 | didopen = 1; |
| 1964 | if (waslocked == 0) |
| 1965 | mutex_enter(vp->v_interlock); |
| 1966 | } |
| 1967 | KASSERT(cvp != NULL); |
| 1968 | |
| 1969 | /* Munge the arg structure to refer to the container vnode. */ |
| 1970 | KASSERT(cvp->v_interlock == vp->v_interlock); |
| 1971 | ap->a_vp = cp->c_ovp; |
| 1972 | |
| 1973 | /* Finally, call getpages on it. */ |
| 1974 | error = VCALL(ap->a_vp, VOFFSET(vop_getpages), ap); |
| 1975 | |
| 1976 | /* If we opened the vnode, we must close it. */ |
| 1977 | if (didopen) { |
| 1978 | /* |
| 1979 | * VOP_CLOSE requires a locked vnode, but we are still |
| 1980 | * holding the lock (or riding a caller's lock). |
| 1981 | */ |
| 1982 | cerror = VOP_CLOSE(vp, FREAD, cred); |
| 1983 | #ifdef CODA_VERBOSE |
| 1984 | if (cerror != 0) |
| 1985 | /* XXX How should we handle this? */ |
| 1986 | printf("%s: closed vnode %p -> %d\n" , __func__, |
| 1987 | vp, cerror); |
| 1988 | #endif |
| 1989 | |
| 1990 | /* If we obtained a lock, drop it. */ |
| 1991 | if (waslocked == 0) |
| 1992 | VOP_UNLOCK(vp); |
| 1993 | } |
| 1994 | |
| 1995 | return error; |
| 1996 | } |
| 1997 | |
| 1998 | /* |
| 1999 | * The protocol requires v_interlock to be held by the caller. |
| 2000 | */ |
| 2001 | int |
| 2002 | coda_putpages(void *v) |
| 2003 | { |
| 2004 | struct vop_putpages_args /* { |
| 2005 | vnode_t *a_vp; |
| 2006 | voff_t a_offlo; |
| 2007 | voff_t a_offhi; |
| 2008 | int a_flags; |
| 2009 | } */ *ap = v; |
| 2010 | vnode_t *vp = ap->a_vp, *cvp; |
| 2011 | struct cnode *cp = VTOC(vp); |
| 2012 | int error; |
| 2013 | |
| 2014 | KASSERT(mutex_owned(vp->v_interlock)); |
| 2015 | |
| 2016 | /* Check for control object. */ |
| 2017 | if (IS_CTL_VP(vp)) { |
| 2018 | mutex_exit(vp->v_interlock); |
| 2019 | #ifdef CODA_VERBOSE |
| 2020 | printf("%s: control object %p\n" , __func__, vp); |
| 2021 | #endif |
| 2022 | return 0; |
| 2023 | } |
| 2024 | |
| 2025 | /* |
| 2026 | * If container object is not present, then there are no pages |
| 2027 | * to put; just return without error. This happens all the |
| 2028 | * time, apparently during discard of a closed vnode (which |
| 2029 | * trivially can't have dirty pages). |
| 2030 | */ |
| 2031 | cvp = cp->c_ovp; |
| 2032 | if (cvp == NULL) { |
| 2033 | mutex_exit(vp->v_interlock); |
| 2034 | return 0; |
| 2035 | } |
| 2036 | |
| 2037 | /* Munge the arg structure to refer to the container vnode. */ |
| 2038 | KASSERT(cvp->v_interlock == vp->v_interlock); |
| 2039 | ap->a_vp = cvp; |
| 2040 | |
| 2041 | /* Finally, call putpages on it. */ |
| 2042 | error = VCALL(ap->a_vp, VOFFSET(vop_putpages), ap); |
| 2043 | |
| 2044 | return error; |
| 2045 | } |
| 2046 | |