| 1 | /* |
| 2 | * Copyright (c) 1989, 1993 |
| 3 | * The Regents of the University of California. All rights reserved. |
| 4 | * |
| 5 | * This code is derived from software contributed |
| 6 | * to Berkeley by John Heidemann of the UCLA Ficus project. |
| 7 | * |
| 8 | * The statvfs->statfs conversion code was contributed to the DragonFly |
| 9 | * Project by Joerg Sonnenberger <joerg@bec.de>. |
| 10 | * |
| 11 | * Redistribution and use in source and binary forms, with or without |
| 12 | * modification, are permitted provided that the following conditions |
| 13 | * are met: |
| 14 | * 1. Redistributions of source code must retain the above copyright |
| 15 | * notice, this list of conditions and the following disclaimer. |
| 16 | * 2. Redistributions in binary form must reproduce the above copyright |
| 17 | * notice, this list of conditions and the following disclaimer in the |
| 18 | * documentation and/or other materials provided with the distribution. |
| 19 | * 3. All advertising materials mentioning features or use of this software |
| 20 | * must display the following acknowledgement: |
| 21 | * This product includes software developed by the University of |
| 22 | * California, Berkeley and its contributors. |
| 23 | * 4. Neither the name of the University nor the names of its contributors |
| 24 | * may be used to endorse or promote products derived from this software |
| 25 | * without specific prior written permission. |
| 26 | * |
| 27 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 28 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 29 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 30 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 31 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 32 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 33 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 34 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 35 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 36 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 37 | * SUCH DAMAGE. |
| 38 | * |
| 39 | * Source: * @(#)i405_init.c 2.10 92/04/27 UCLA Ficus project |
| 40 | * $FreeBSD: src/sys/kern/vfs_default.c,v 1.28.2.7 2003/01/10 18:23:26 bde Exp $ |
| 41 | * $DragonFly: src/sys/kern/vfs_default.c,v 1.55 2008/09/28 04:31:50 dillon Exp $ |
| 42 | */ |
| 43 | |
| 44 | #include <sys/param.h> |
| 45 | #include <sys/systm.h> |
| 46 | #include <sys/buf.h> |
| 47 | #include <sys/conf.h> |
| 48 | #include <sys/fcntl.h> |
| 49 | #include <sys/file.h> |
| 50 | #include <sys/kernel.h> |
| 51 | #include <sys/lock.h> |
| 52 | #include <sys/malloc.h> |
| 53 | #include <sys/mount.h> |
| 54 | #include <sys/unistd.h> |
| 55 | #include <sys/vnode.h> |
| 56 | #include <sys/namei.h> |
| 57 | #include <sys/nlookup.h> |
| 58 | #include <sys/poll.h> |
| 59 | #include <sys/mountctl.h> |
| 60 | |
| 61 | #include <machine/limits.h> |
| 62 | |
| 63 | #include <vm/vm.h> |
| 64 | #include <vm/vm_object.h> |
| 65 | #include <vm/vm_page.h> |
| 66 | #include <vm/vm_pager.h> |
| 67 | #include <vm/vnode_pager.h> |
| 68 | |
| 69 | static int vop_nolookup (struct vop_old_lookup_args *); |
| 70 | static int vop_nostrategy (struct vop_strategy_args *); |
| 71 | |
| 72 | /* |
| 73 | * This vnode table stores what we want to do if the filesystem doesn't |
| 74 | * implement a particular VOP. |
| 75 | * |
| 76 | * If there is no specific entry here, we will return EOPNOTSUPP. |
| 77 | */ |
| 78 | struct vop_ops default_vnode_vops = { |
| 79 | .vop_default = vop_eopnotsupp, |
| 80 | .vop_advlock = (void *)vop_einval, |
| 81 | .vop_fsync = (void *)vop_null, |
| 82 | .vop_ioctl = (void *)vop_enotty, |
| 83 | .vop_mmap = (void *)vop_einval, |
| 84 | .vop_old_lookup = vop_nolookup, |
| 85 | .vop_open = vop_stdopen, |
| 86 | .vop_close = vop_stdclose, |
| 87 | .vop_pathconf = vop_stdpathconf, |
| 88 | .vop_poll = vop_nopoll, |
| 89 | .vop_readlink = (void *)vop_einval, |
| 90 | .vop_reallocblks = (void *)vop_eopnotsupp, |
| 91 | .vop_strategy = vop_nostrategy, |
| 92 | .vop_getacl = (void *)vop_eopnotsupp, |
| 93 | .vop_setacl = (void *)vop_eopnotsupp, |
| 94 | .vop_aclcheck = (void *)vop_eopnotsupp, |
| 95 | .vop_getextattr = (void *)vop_eopnotsupp, |
| 96 | .vop_setextattr = (void *)vop_eopnotsupp, |
| 97 | .vop_markatime = vop_stdmarkatime, |
| 98 | .vop_nresolve = vop_compat_nresolve, |
| 99 | .vop_nlookupdotdot = vop_compat_nlookupdotdot, |
| 100 | .vop_ncreate = vop_compat_ncreate, |
| 101 | .vop_nmkdir = vop_compat_nmkdir, |
| 102 | .vop_nmknod = vop_compat_nmknod, |
| 103 | .vop_nlink = vop_compat_nlink, |
| 104 | .vop_nsymlink = vop_compat_nsymlink, |
| 105 | .vop_nwhiteout = vop_compat_nwhiteout, |
| 106 | .vop_nremove = vop_compat_nremove, |
| 107 | .vop_nrmdir = vop_compat_nrmdir, |
| 108 | .vop_nrename = vop_compat_nrename, |
| 109 | .vop_mountctl = vop_stdmountctl |
| 110 | }; |
| 111 | |
| 112 | VNODEOP_SET(default_vnode_vops); |
| 113 | |
| 114 | int |
| 115 | vop_eopnotsupp(struct vop_generic_args *ap) |
| 116 | { |
| 117 | return (EOPNOTSUPP); |
| 118 | } |
| 119 | |
| 120 | int |
| 121 | vop_ebadf(struct vop_generic_args *ap) |
| 122 | { |
| 123 | return (EBADF); |
| 124 | } |
| 125 | |
| 126 | int |
| 127 | vop_enotty(struct vop_generic_args *ap) |
| 128 | { |
| 129 | return (ENOTTY); |
| 130 | } |
| 131 | |
| 132 | int |
| 133 | vop_einval(struct vop_generic_args *ap) |
| 134 | { |
| 135 | return (EINVAL); |
| 136 | } |
| 137 | |
| 138 | int |
| 139 | vop_stdmarkatime(struct vop_markatime_args *ap) |
| 140 | { |
| 141 | return (EOPNOTSUPP); |
| 142 | } |
| 143 | |
| 144 | int |
| 145 | vop_null(struct vop_generic_args *ap) |
| 146 | { |
| 147 | return (0); |
| 148 | } |
| 149 | |
| 150 | int |
| 151 | vop_defaultop(struct vop_generic_args *ap) |
| 152 | { |
| 153 | return (VOCALL(&default_vnode_vops, ap)); |
| 154 | } |
| 155 | |
| 156 | int |
| 157 | vop_panic(struct vop_generic_args *ap) |
| 158 | { |
| 159 | panic("filesystem goof: vop_panic[%s]", ap->a_desc->sd_name); |
| 160 | } |
| 161 | |
| 162 | /* |
| 163 | * vop_compat_resolve { struct nchandle *a_nch, struct vnode *dvp } |
| 164 | * XXX STOPGAP FUNCTION |
| 165 | * |
| 166 | * XXX OLD API ROUTINE! WHEN ALL VFSs HAVE BEEN CLEANED UP THIS PROCEDURE |
| 167 | * WILL BE REMOVED. This procedure exists for all VFSs which have not |
| 168 | * yet implemented VOP_NRESOLVE(). It converts VOP_NRESOLVE() into a |
| 169 | * vop_old_lookup() and does appropriate translations. |
| 170 | * |
| 171 | * Resolve a ncp for VFSs which do not support the VOP. Eventually all |
| 172 | * VFSs will support this VOP and this routine can be removed, since |
| 173 | * VOP_NRESOLVE() is far less complex then the older LOOKUP/CACHEDLOOKUP |
| 174 | * API. |
| 175 | * |
| 176 | * A locked ncp is passed in to be resolved. The NCP is resolved by |
| 177 | * figuring out the vnode (if any) and calling cache_setvp() to attach the |
| 178 | * vnode to the entry. If the entry represents a non-existant node then |
| 179 | * cache_setvp() is called with a NULL vnode to resolve the entry into a |
| 180 | * negative cache entry. No vnode locks are retained and the |
| 181 | * ncp is left locked on return. |
| 182 | * |
| 183 | * The ncp will NEVER represent "", "." or "..", or contain any slashes. |
| 184 | * |
| 185 | * There is a potential directory and vnode interlock. The lock order |
| 186 | * requirement is: namecache, governing directory, resolved vnode. |
| 187 | */ |
| 188 | int |
| 189 | vop_compat_nresolve(struct vop_nresolve_args *ap) |
| 190 | { |
| 191 | int error; |
| 192 | struct vnode *dvp; |
| 193 | struct vnode *vp; |
| 194 | struct nchandle *nch; |
| 195 | struct namecache *ncp; |
| 196 | struct componentname cnp; |
| 197 | |
| 198 | nch = ap->a_nch; /* locked namecache node */ |
| 199 | ncp = nch->ncp; |
| 200 | dvp = ap->a_dvp; |
| 201 | |
| 202 | /* |
| 203 | * UFS currently stores all sorts of side effects, including a loop |
| 204 | * variable, in the directory inode. That needs to be fixed and the |
| 205 | * other VFS's audited before we can switch to LK_SHARED. |
| 206 | */ |
| 207 | if ((error = vget(dvp, LK_EXCLUSIVE)) != 0) { |
| 208 | kprintf("[diagnostic] vop_compat_resolve: EAGAIN on ncp %p %s\n", |
| 209 | ncp, ncp->nc_name); |
| 210 | return(EAGAIN); |
| 211 | } |
| 212 | |
| 213 | bzero(&cnp, sizeof(cnp)); |
| 214 | cnp.cn_nameiop = NAMEI_LOOKUP; |
| 215 | cnp.cn_flags = 0; |
| 216 | cnp.cn_nameptr = ncp->nc_name; |
| 217 | cnp.cn_namelen = ncp->nc_nlen; |
| 218 | cnp.cn_cred = ap->a_cred; |
| 219 | cnp.cn_td = curthread; /* XXX */ |
| 220 | |
| 221 | /* |
| 222 | * vop_old_lookup() always returns vp locked. dvp may or may not be |
| 223 | * left locked depending on CNP_PDIRUNLOCK. |
| 224 | */ |
| 225 | error = vop_old_lookup(ap->a_head.a_ops, dvp, &vp, &cnp); |
| 226 | if (error == 0) |
| 227 | vn_unlock(vp); |
| 228 | if ((cnp.cn_flags & CNP_PDIRUNLOCK) == 0) |
| 229 | vn_unlock(dvp); |
| 230 | if ((ncp->nc_flag & NCF_UNRESOLVED) == 0) { |
| 231 | /* was resolved by another process while we were unlocked */ |
| 232 | if (error == 0) |
| 233 | vrele(vp); |
| 234 | } else if (error == 0) { |
| 235 | KKASSERT(vp != NULL); |
| 236 | cache_setvp(nch, vp); |
| 237 | vrele(vp); |
| 238 | } else if (error == ENOENT) { |
| 239 | KKASSERT(vp == NULL); |
| 240 | if (cnp.cn_flags & CNP_ISWHITEOUT) |
| 241 | ncp->nc_flag |= NCF_WHITEOUT; |
| 242 | cache_setvp(nch, NULL); |
| 243 | } |
| 244 | vrele(dvp); |
| 245 | return (error); |
| 246 | } |
| 247 | |
| 248 | /* |
| 249 | * vop_compat_nlookupdotdot { struct vnode *a_dvp, |
| 250 | * struct vnode **a_vpp, |
| 251 | * struct ucred *a_cred } |
| 252 | * |
| 253 | * Lookup the vnode representing the parent directory of the specified |
| 254 | * directory vnode. a_dvp should not be locked. If no error occurs *a_vpp |
| 255 | * will contained the parent vnode, locked and refd, else *a_vpp will be NULL. |
| 256 | * |
| 257 | * This function is designed to aid NFS server-side operations and is |
| 258 | * used by cache_fromdvp() to create a consistent, connected namecache |
| 259 | * topology. |
| 260 | * |
| 261 | * As part of the NEW API work, VFSs will first split their CNP_ISDOTDOT |
| 262 | * code out from their *_lookup() and create *_nlookupdotdot(). Then as time |
| 263 | * permits VFSs will implement the remaining *_n*() calls and finally get |
| 264 | * rid of their *_lookup() call. |
| 265 | */ |
| 266 | int |
| 267 | vop_compat_nlookupdotdot(struct vop_nlookupdotdot_args *ap) |
| 268 | { |
| 269 | struct componentname cnp; |
| 270 | int error; |
| 271 | |
| 272 | /* |
| 273 | * UFS currently stores all sorts of side effects, including a loop |
| 274 | * variable, in the directory inode. That needs to be fixed and the |
| 275 | * other VFS's audited before we can switch to LK_SHARED. |
| 276 | */ |
| 277 | *ap->a_vpp = NULL; |
| 278 | if ((error = vget(ap->a_dvp, LK_EXCLUSIVE)) != 0) |
| 279 | return (error); |
| 280 | if (ap->a_dvp->v_type != VDIR) { |
| 281 | vput(ap->a_dvp); |
| 282 | return (ENOTDIR); |
| 283 | } |
| 284 | |
| 285 | bzero(&cnp, sizeof(cnp)); |
| 286 | cnp.cn_nameiop = NAMEI_LOOKUP; |
| 287 | cnp.cn_flags = CNP_ISDOTDOT; |
| 288 | cnp.cn_nameptr = ".."; |
| 289 | cnp.cn_namelen = 2; |
| 290 | cnp.cn_cred = ap->a_cred; |
| 291 | cnp.cn_td = curthread; /* XXX */ |
| 292 | |
| 293 | /* |
| 294 | * vop_old_lookup() always returns vp locked. dvp may or may not be |
| 295 | * left locked depending on CNP_PDIRUNLOCK. |
| 296 | */ |
| 297 | error = vop_old_lookup(ap->a_head.a_ops, ap->a_dvp, ap->a_vpp, &cnp); |
| 298 | if (error == 0) |
| 299 | vn_unlock(*ap->a_vpp); |
| 300 | if (cnp.cn_flags & CNP_PDIRUNLOCK) |
| 301 | vrele(ap->a_dvp); |
| 302 | else |
| 303 | vput(ap->a_dvp); |
| 304 | return (error); |
| 305 | } |
| 306 | |
| 307 | /* |
| 308 | * vop_compat_ncreate { struct nchandle *a_nch, XXX STOPGAP FUNCTION |
| 309 | * struct vnode *a_dvp, |
| 310 | * struct vnode **a_vpp, |
| 311 | * struct ucred *a_cred, |
| 312 | * struct vattr *a_vap } |
| 313 | * |
| 314 | * Create a file as specified by a_vap. Compatibility requires us to issue |
| 315 | * the appropriate VOP_OLD_LOOKUP before we issue VOP_OLD_CREATE in order |
| 316 | * to setup the directory inode's i_offset and i_count (e.g. in UFS). |
| 317 | */ |
| 318 | int |
| 319 | vop_compat_ncreate(struct vop_ncreate_args *ap) |
| 320 | { |
| 321 | struct thread *td = curthread; |
| 322 | struct componentname cnp; |
| 323 | struct nchandle *nch; |
| 324 | struct namecache *ncp; |
| 325 | struct vnode *dvp; |
| 326 | int error; |
| 327 | |
| 328 | /* |
| 329 | * Sanity checks, get a locked directory vnode. |
| 330 | */ |
| 331 | nch = ap->a_nch; /* locked namecache node */ |
| 332 | dvp = ap->a_dvp; |
| 333 | ncp = nch->ncp; |
| 334 | |
| 335 | if ((error = vget(dvp, LK_EXCLUSIVE)) != 0) { |
| 336 | kprintf("[diagnostic] vop_compat_resolve: EAGAIN on ncp %p %s\n", |
| 337 | ncp, ncp->nc_name); |
| 338 | return(EAGAIN); |
| 339 | } |
| 340 | |
| 341 | /* |
| 342 | * Setup the cnp for a traditional vop_old_lookup() call. The lookup |
| 343 | * caches all information required to create the entry in the |
| 344 | * directory inode. We expect a return code of EJUSTRETURN for |
| 345 | * the CREATE case. The cnp must simulated a saved-name situation. |
| 346 | */ |
| 347 | bzero(&cnp, sizeof(cnp)); |
| 348 | cnp.cn_nameiop = NAMEI_CREATE; |
| 349 | cnp.cn_flags = CNP_LOCKPARENT; |
| 350 | cnp.cn_nameptr = ncp->nc_name; |
| 351 | cnp.cn_namelen = ncp->nc_nlen; |
| 352 | cnp.cn_cred = ap->a_cred; |
| 353 | cnp.cn_td = td; |
| 354 | *ap->a_vpp = NULL; |
| 355 | |
| 356 | error = vop_old_lookup(ap->a_head.a_ops, dvp, ap->a_vpp, &cnp); |
| 357 | |
| 358 | /* |
| 359 | * EJUSTRETURN should be returned for this case, which means that |
| 360 | * the VFS has setup the directory inode for the create. The dvp we |
| 361 | * passed in is expected to remain in a locked state. |
| 362 | * |
| 363 | * If the VOP_OLD_CREATE is successful we are responsible for updating |
| 364 | * the cache state of the locked ncp that was passed to us. |
| 365 | */ |
| 366 | if (error == EJUSTRETURN) { |
| 367 | KKASSERT((cnp.cn_flags & CNP_PDIRUNLOCK) == 0); |
| 368 | error = VOP_OLD_CREATE(dvp, ap->a_vpp, &cnp, ap->a_vap); |
| 369 | if (error == 0) { |
| 370 | cache_setunresolved(nch); |
| 371 | cache_setvp(nch, *ap->a_vpp); |
| 372 | } |
| 373 | } else { |
| 374 | if (error == 0) { |
| 375 | vput(*ap->a_vpp); |
| 376 | *ap->a_vpp = NULL; |
| 377 | error = EEXIST; |
| 378 | } |
| 379 | KKASSERT(*ap->a_vpp == NULL); |
| 380 | } |
| 381 | if ((cnp.cn_flags & CNP_PDIRUNLOCK) == 0) |
| 382 | vn_unlock(dvp); |
| 383 | vrele(dvp); |
| 384 | return (error); |
| 385 | } |
| 386 | |
| 387 | /* |
| 388 | * vop_compat_nmkdir { struct nchandle *a_nch, XXX STOPGAP FUNCTION |
| 389 | * struct vnode *a_dvp, |
| 390 | * struct vnode **a_vpp, |
| 391 | * struct ucred *a_cred, |
| 392 | * struct vattr *a_vap } |
| 393 | * |
| 394 | * Create a directory as specified by a_vap. Compatibility requires us to |
| 395 | * issue the appropriate VOP_OLD_LOOKUP before we issue VOP_OLD_MKDIR in |
| 396 | * order to setup the directory inode's i_offset and i_count (e.g. in UFS). |
| 397 | */ |
| 398 | int |
| 399 | vop_compat_nmkdir(struct vop_nmkdir_args *ap) |
| 400 | { |
| 401 | struct thread *td = curthread; |
| 402 | struct componentname cnp; |
| 403 | struct nchandle *nch; |
| 404 | struct namecache *ncp; |
| 405 | struct vnode *dvp; |
| 406 | int error; |
| 407 | |
| 408 | /* |
| 409 | * Sanity checks, get a locked directory vnode. |
| 410 | */ |
| 411 | nch = ap->a_nch; /* locked namecache node */ |
| 412 | ncp = nch->ncp; |
| 413 | dvp = ap->a_dvp; |
| 414 | if ((error = vget(dvp, LK_EXCLUSIVE)) != 0) { |
| 415 | kprintf("[diagnostic] vop_compat_resolve: EAGAIN on ncp %p %s\n", |
| 416 | ncp, ncp->nc_name); |
| 417 | return(EAGAIN); |
| 418 | } |
| 419 | |
| 420 | /* |
| 421 | * Setup the cnp for a traditional vop_old_lookup() call. The lookup |
| 422 | * caches all information required to create the entry in the |
| 423 | * directory inode. We expect a return code of EJUSTRETURN for |
| 424 | * the CREATE case. The cnp must simulated a saved-name situation. |
| 425 | */ |
| 426 | bzero(&cnp, sizeof(cnp)); |
| 427 | cnp.cn_nameiop = NAMEI_CREATE; |
| 428 | cnp.cn_flags = CNP_LOCKPARENT; |
| 429 | cnp.cn_nameptr = ncp->nc_name; |
| 430 | cnp.cn_namelen = ncp->nc_nlen; |
| 431 | cnp.cn_cred = ap->a_cred; |
| 432 | cnp.cn_td = td; |
| 433 | *ap->a_vpp = NULL; |
| 434 | |
| 435 | error = vop_old_lookup(ap->a_head.a_ops, dvp, ap->a_vpp, &cnp); |
| 436 | |
| 437 | /* |
| 438 | * EJUSTRETURN should be returned for this case, which means that |
| 439 | * the VFS has setup the directory inode for the create. The dvp we |
| 440 | * passed in is expected to remain in a locked state. |
| 441 | * |
| 442 | * If the VOP_OLD_MKDIR is successful we are responsible for updating |
| 443 | * the cache state of the locked ncp that was passed to us. |
| 444 | */ |
| 445 | if (error == EJUSTRETURN) { |
| 446 | KKASSERT((cnp.cn_flags & CNP_PDIRUNLOCK) == 0); |
| 447 | error = VOP_OLD_MKDIR(dvp, ap->a_vpp, &cnp, ap->a_vap); |
| 448 | if (error == 0) { |
| 449 | cache_setunresolved(nch); |
| 450 | cache_setvp(nch, *ap->a_vpp); |
| 451 | } |
| 452 | } else { |
| 453 | if (error == 0) { |
| 454 | vput(*ap->a_vpp); |
| 455 | *ap->a_vpp = NULL; |
| 456 | error = EEXIST; |
| 457 | } |
| 458 | KKASSERT(*ap->a_vpp == NULL); |
| 459 | } |
| 460 | if ((cnp.cn_flags & CNP_PDIRUNLOCK) == 0) |
| 461 | vn_unlock(dvp); |
| 462 | vrele(dvp); |
| 463 | return (error); |
| 464 | } |
| 465 | |
| 466 | /* |
| 467 | * vop_compat_nmknod { struct nchandle *a_nch, XXX STOPGAP FUNCTION |
| 468 | * struct vnode *a_dvp, |
| 469 | * struct vnode **a_vpp, |
| 470 | * struct ucred *a_cred, |
| 471 | * struct vattr *a_vap } |
| 472 | * |
| 473 | * Create a device or fifo node as specified by a_vap. Compatibility requires |
| 474 | * us to issue the appropriate VOP_OLD_LOOKUP before we issue VOP_OLD_MKNOD |
| 475 | * in order to setup the directory inode's i_offset and i_count (e.g. in UFS). |
| 476 | */ |
| 477 | int |
| 478 | vop_compat_nmknod(struct vop_nmknod_args *ap) |
| 479 | { |
| 480 | struct thread *td = curthread; |
| 481 | struct componentname cnp; |
| 482 | struct nchandle *nch; |
| 483 | struct namecache *ncp; |
| 484 | struct vnode *dvp; |
| 485 | int error; |
| 486 | |
| 487 | /* |
| 488 | * Sanity checks, get a locked directory vnode. |
| 489 | */ |
| 490 | nch = ap->a_nch; /* locked namecache node */ |
| 491 | ncp = nch->ncp; |
| 492 | dvp = ap->a_dvp; |
| 493 | |
| 494 | if ((error = vget(dvp, LK_EXCLUSIVE)) != 0) { |
| 495 | kprintf("[diagnostic] vop_compat_resolve: EAGAIN on ncp %p %s\n", |
| 496 | ncp, ncp->nc_name); |
| 497 | return(EAGAIN); |
| 498 | } |
| 499 | |
| 500 | /* |
| 501 | * Setup the cnp for a traditional vop_old_lookup() call. The lookup |
| 502 | * caches all information required to create the entry in the |
| 503 | * directory inode. We expect a return code of EJUSTRETURN for |
| 504 | * the CREATE case. The cnp must simulated a saved-name situation. |
| 505 | */ |
| 506 | bzero(&cnp, sizeof(cnp)); |
| 507 | cnp.cn_nameiop = NAMEI_CREATE; |
| 508 | cnp.cn_flags = CNP_LOCKPARENT; |
| 509 | cnp.cn_nameptr = ncp->nc_name; |
| 510 | cnp.cn_namelen = ncp->nc_nlen; |
| 511 | cnp.cn_cred = ap->a_cred; |
| 512 | cnp.cn_td = td; |
| 513 | *ap->a_vpp = NULL; |
| 514 | |
| 515 | error = vop_old_lookup(ap->a_head.a_ops, dvp, ap->a_vpp, &cnp); |
| 516 | |
| 517 | /* |
| 518 | * EJUSTRETURN should be returned for this case, which means that |
| 519 | * the VFS has setup the directory inode for the create. The dvp we |
| 520 | * passed in is expected to remain in a locked state. |
| 521 | * |
| 522 | * If the VOP_OLD_MKNOD is successful we are responsible for updating |
| 523 | * the cache state of the locked ncp that was passed to us. |
| 524 | */ |
| 525 | if (error == EJUSTRETURN) { |
| 526 | KKASSERT((cnp.cn_flags & CNP_PDIRUNLOCK) == 0); |
| 527 | error = VOP_OLD_MKNOD(dvp, ap->a_vpp, &cnp, ap->a_vap); |
| 528 | if (error == 0) { |
| 529 | cache_setunresolved(nch); |
| 530 | cache_setvp(nch, *ap->a_vpp); |
| 531 | } |
| 532 | } else { |
| 533 | if (error == 0) { |
| 534 | vput(*ap->a_vpp); |
| 535 | *ap->a_vpp = NULL; |
| 536 | error = EEXIST; |
| 537 | } |
| 538 | KKASSERT(*ap->a_vpp == NULL); |
| 539 | } |
| 540 | if ((cnp.cn_flags & CNP_PDIRUNLOCK) == 0) |
| 541 | vn_unlock(dvp); |
| 542 | vrele(dvp); |
| 543 | return (error); |
| 544 | } |
| 545 | |
| 546 | /* |
| 547 | * vop_compat_nlink { struct nchandle *a_nch, XXX STOPGAP FUNCTION |
| 548 | * struct vnode *a_dvp, |
| 549 | * struct vnode *a_vp, |
| 550 | * struct ucred *a_cred } |
| 551 | * |
| 552 | * The passed vp is locked and represents the source. The passed ncp is |
| 553 | * locked and represents the target to create. |
| 554 | */ |
| 555 | int |
| 556 | vop_compat_nlink(struct vop_nlink_args *ap) |
| 557 | { |
| 558 | struct thread *td = curthread; |
| 559 | struct componentname cnp; |
| 560 | struct nchandle *nch; |
| 561 | struct namecache *ncp; |
| 562 | struct vnode *dvp; |
| 563 | struct vnode *tvp; |
| 564 | int error; |
| 565 | |
| 566 | /* |
| 567 | * Sanity checks, get a locked directory vnode. |
| 568 | */ |
| 569 | nch = ap->a_nch; /* locked namecache node */ |
| 570 | ncp = nch->ncp; |
| 571 | dvp = ap->a_dvp; |
| 572 | |
| 573 | if ((error = vget(dvp, LK_EXCLUSIVE)) != 0) { |
| 574 | kprintf("[diagnostic] vop_compat_resolve: EAGAIN on ncp %p %s\n", |
| 575 | ncp, ncp->nc_name); |
| 576 | return(EAGAIN); |
| 577 | } |
| 578 | |
| 579 | /* |
| 580 | * Setup the cnp for a traditional vop_old_lookup() call. The lookup |
| 581 | * caches all information required to create the entry in the |
| 582 | * directory inode. We expect a return code of EJUSTRETURN for |
| 583 | * the CREATE case. The cnp must simulated a saved-name situation. |
| 584 | */ |
| 585 | bzero(&cnp, sizeof(cnp)); |
| 586 | cnp.cn_nameiop = NAMEI_CREATE; |
| 587 | cnp.cn_flags = CNP_LOCKPARENT; |
| 588 | cnp.cn_nameptr = ncp->nc_name; |
| 589 | cnp.cn_namelen = ncp->nc_nlen; |
| 590 | cnp.cn_cred = ap->a_cred; |
| 591 | cnp.cn_td = td; |
| 592 | |
| 593 | tvp = NULL; |
| 594 | error = vop_old_lookup(ap->a_head.a_ops, dvp, &tvp, &cnp); |
| 595 | |
| 596 | /* |
| 597 | * EJUSTRETURN should be returned for this case, which means that |
| 598 | * the VFS has setup the directory inode for the create. The dvp we |
| 599 | * passed in is expected to remain in a locked state. |
| 600 | * |
| 601 | * If the VOP_OLD_LINK is successful we are responsible for updating |
| 602 | * the cache state of the locked ncp that was passed to us. |
| 603 | */ |
| 604 | if (error == EJUSTRETURN) { |
| 605 | KKASSERT((cnp.cn_flags & CNP_PDIRUNLOCK) == 0); |
| 606 | error = VOP_OLD_LINK(dvp, ap->a_vp, &cnp); |
| 607 | if (error == 0) { |
| 608 | cache_setunresolved(nch); |
| 609 | cache_setvp(nch, ap->a_vp); |
| 610 | } |
| 611 | } else { |
| 612 | if (error == 0) { |
| 613 | vput(tvp); |
| 614 | error = EEXIST; |
| 615 | } |
| 616 | } |
| 617 | if ((cnp.cn_flags & CNP_PDIRUNLOCK) == 0) |
| 618 | vn_unlock(dvp); |
| 619 | vrele(dvp); |
| 620 | return (error); |
| 621 | } |
| 622 | |
| 623 | int |
| 624 | vop_compat_nsymlink(struct vop_nsymlink_args *ap) |
| 625 | { |
| 626 | struct thread *td = curthread; |
| 627 | struct componentname cnp; |
| 628 | struct nchandle *nch; |
| 629 | struct namecache *ncp; |
| 630 | struct vnode *dvp; |
| 631 | struct vnode *vp; |
| 632 | int error; |
| 633 | |
| 634 | /* |
| 635 | * Sanity checks, get a locked directory vnode. |
| 636 | */ |
| 637 | *ap->a_vpp = NULL; |
| 638 | nch = ap->a_nch; /* locked namecache node */ |
| 639 | ncp = nch->ncp; |
| 640 | dvp = ap->a_dvp; |
| 641 | |
| 642 | if ((error = vget(dvp, LK_EXCLUSIVE)) != 0) { |
| 643 | kprintf("[diagnostic] vop_compat_resolve: EAGAIN on ncp %p %s\n", |
| 644 | ncp, ncp->nc_name); |
| 645 | return(EAGAIN); |
| 646 | } |
| 647 | |
| 648 | /* |
| 649 | * Setup the cnp for a traditional vop_old_lookup() call. The lookup |
| 650 | * caches all information required to create the entry in the |
| 651 | * directory inode. We expect a return code of EJUSTRETURN for |
| 652 | * the CREATE case. The cnp must simulated a saved-name situation. |
| 653 | */ |
| 654 | bzero(&cnp, sizeof(cnp)); |
| 655 | cnp.cn_nameiop = NAMEI_CREATE; |
| 656 | cnp.cn_flags = CNP_LOCKPARENT; |
| 657 | cnp.cn_nameptr = ncp->nc_name; |
| 658 | cnp.cn_namelen = ncp->nc_nlen; |
| 659 | cnp.cn_cred = ap->a_cred; |
| 660 | cnp.cn_td = td; |
| 661 | |
| 662 | vp = NULL; |
| 663 | error = vop_old_lookup(ap->a_head.a_ops, dvp, &vp, &cnp); |
| 664 | |
| 665 | /* |
| 666 | * EJUSTRETURN should be returned for this case, which means that |
| 667 | * the VFS has setup the directory inode for the create. The dvp we |
| 668 | * passed in is expected to remain in a locked state. |
| 669 | * |
| 670 | * If the VOP_OLD_SYMLINK is successful we are responsible for updating |
| 671 | * the cache state of the locked ncp that was passed to us. |
| 672 | */ |
| 673 | if (error == EJUSTRETURN) { |
| 674 | KKASSERT((cnp.cn_flags & CNP_PDIRUNLOCK) == 0); |
| 675 | error = VOP_OLD_SYMLINK(dvp, &vp, &cnp, ap->a_vap, ap->a_target); |
| 676 | if (error == 0) { |
| 677 | cache_setunresolved(nch); |
| 678 | cache_setvp(nch, vp); |
| 679 | *ap->a_vpp = vp; |
| 680 | } |
| 681 | } else { |
| 682 | if (error == 0) { |
| 683 | vput(vp); |
| 684 | vp = NULL; |
| 685 | error = EEXIST; |
| 686 | } |
| 687 | KKASSERT(vp == NULL); |
| 688 | } |
| 689 | if ((cnp.cn_flags & CNP_PDIRUNLOCK) == 0) |
| 690 | vn_unlock(dvp); |
| 691 | vrele(dvp); |
| 692 | return (error); |
| 693 | } |
| 694 | |
| 695 | /* |
| 696 | * vop_compat_nwhiteout { struct nchandle *a_nch, XXX STOPGAP FUNCTION |
| 697 | * struct vnode *a_dvp, |
| 698 | * struct ucred *a_cred, |
| 699 | * int a_flags } |
| 700 | * |
| 701 | * Issie a whiteout operation (create, lookup, or delete). Compatibility |
| 702 | * requires us to issue the appropriate VOP_OLD_LOOKUP before we issue |
| 703 | * VOP_OLD_WHITEOUT in order to setup the directory inode's i_offset and i_count |
| 704 | * (e.g. in UFS) for the NAMEI_CREATE and NAMEI_DELETE ops. For NAMEI_LOOKUP |
| 705 | * no lookup is necessary. |
| 706 | */ |
| 707 | int |
| 708 | vop_compat_nwhiteout(struct vop_nwhiteout_args *ap) |
| 709 | { |
| 710 | struct thread *td = curthread; |
| 711 | struct componentname cnp; |
| 712 | struct nchandle *nch; |
| 713 | struct namecache *ncp; |
| 714 | struct vnode *dvp; |
| 715 | struct vnode *vp; |
| 716 | int error; |
| 717 | |
| 718 | /* |
| 719 | * Sanity checks, get a locked directory vnode. |
| 720 | */ |
| 721 | nch = ap->a_nch; /* locked namecache node */ |
| 722 | ncp = nch->ncp; |
| 723 | dvp = ap->a_dvp; |
| 724 | |
| 725 | if ((error = vget(dvp, LK_EXCLUSIVE)) != 0) { |
| 726 | kprintf("[diagnostic] vop_compat_resolve: EAGAIN on ncp %p %s\n", |
| 727 | ncp, ncp->nc_name); |
| 728 | return(EAGAIN); |
| 729 | } |
| 730 | |
| 731 | /* |
| 732 | * Setup the cnp for a traditional vop_old_lookup() call. The lookup |
| 733 | * caches all information required to create the entry in the |
| 734 | * directory inode. We expect a return code of EJUSTRETURN for |
| 735 | * the CREATE case. The cnp must simulated a saved-name situation. |
| 736 | */ |
| 737 | bzero(&cnp, sizeof(cnp)); |
| 738 | cnp.cn_nameiop = ap->a_flags; |
| 739 | cnp.cn_flags = CNP_LOCKPARENT; |
| 740 | cnp.cn_nameptr = ncp->nc_name; |
| 741 | cnp.cn_namelen = ncp->nc_nlen; |
| 742 | cnp.cn_cred = ap->a_cred; |
| 743 | cnp.cn_td = td; |
| 744 | |
| 745 | vp = NULL; |
| 746 | |
| 747 | /* |
| 748 | * EJUSTRETURN should be returned for the CREATE or DELETE cases. |
| 749 | * The VFS has setup the directory inode for the create. The dvp we |
| 750 | * passed in is expected to remain in a locked state. |
| 751 | * |
| 752 | * If the VOP_OLD_WHITEOUT is successful we are responsible for updating |
| 753 | * the cache state of the locked ncp that was passed to us. |
| 754 | */ |
| 755 | switch(ap->a_flags) { |
| 756 | case NAMEI_DELETE: |
| 757 | cnp.cn_flags |= CNP_DOWHITEOUT; |
| 758 | /* fall through */ |
| 759 | case NAMEI_CREATE: |
| 760 | error = vop_old_lookup(ap->a_head.a_ops, dvp, &vp, &cnp); |
| 761 | if (error == EJUSTRETURN) { |
| 762 | KKASSERT((cnp.cn_flags & CNP_PDIRUNLOCK) == 0); |
| 763 | error = VOP_OLD_WHITEOUT(dvp, &cnp, ap->a_flags); |
| 764 | if (error == 0) |
| 765 | cache_setunresolved(nch); |
| 766 | } else { |
| 767 | if (error == 0) { |
| 768 | vput(vp); |
| 769 | vp = NULL; |
| 770 | error = EEXIST; |
| 771 | } |
| 772 | KKASSERT(vp == NULL); |
| 773 | } |
| 774 | break; |
| 775 | case NAMEI_LOOKUP: |
| 776 | error = VOP_OLD_WHITEOUT(dvp, NULL, ap->a_flags); |
| 777 | break; |
| 778 | default: |
| 779 | error = EINVAL; |
| 780 | break; |
| 781 | } |
| 782 | if ((cnp.cn_flags & CNP_PDIRUNLOCK) == 0) |
| 783 | vn_unlock(dvp); |
| 784 | vrele(dvp); |
| 785 | return (error); |
| 786 | } |
| 787 | |
| 788 | |
| 789 | /* |
| 790 | * vop_compat_nremove { struct nchandle *a_nch, XXX STOPGAP FUNCTION |
| 791 | * struct vnode *a_dvp, |
| 792 | * struct ucred *a_cred } |
| 793 | */ |
| 794 | int |
| 795 | vop_compat_nremove(struct vop_nremove_args *ap) |
| 796 | { |
| 797 | struct thread *td = curthread; |
| 798 | struct componentname cnp; |
| 799 | struct nchandle *nch; |
| 800 | struct namecache *ncp; |
| 801 | struct vnode *dvp; |
| 802 | struct vnode *vp; |
| 803 | int error; |
| 804 | |
| 805 | /* |
| 806 | * Sanity checks, get a locked directory vnode. |
| 807 | */ |
| 808 | nch = ap->a_nch; /* locked namecache node */ |
| 809 | ncp = nch->ncp; |
| 810 | dvp = ap->a_dvp; |
| 811 | |
| 812 | if ((error = vget(dvp, LK_EXCLUSIVE)) != 0) { |
| 813 | kprintf("[diagnostic] vop_compat_resolve: EAGAIN on ncp %p %s\n", |
| 814 | ncp, ncp->nc_name); |
| 815 | return(EAGAIN); |
| 816 | } |
| 817 | |
| 818 | /* |
| 819 | * Setup the cnp for a traditional vop_old_lookup() call. The lookup |
| 820 | * caches all information required to delete the entry in the |
| 821 | * directory inode. We expect a return code of 0 for the DELETE |
| 822 | * case (meaning that a vp has been found). The cnp must simulated |
| 823 | * a saved-name situation. |
| 824 | */ |
| 825 | bzero(&cnp, sizeof(cnp)); |
| 826 | cnp.cn_nameiop = NAMEI_DELETE; |
| 827 | cnp.cn_flags = CNP_LOCKPARENT; |
| 828 | cnp.cn_nameptr = ncp->nc_name; |
| 829 | cnp.cn_namelen = ncp->nc_nlen; |
| 830 | cnp.cn_cred = ap->a_cred; |
| 831 | cnp.cn_td = td; |
| 832 | |
| 833 | /* |
| 834 | * The vnode must be a directory and must not represent the |
| 835 | * current directory. |
| 836 | */ |
| 837 | vp = NULL; |
| 838 | error = vop_old_lookup(ap->a_head.a_ops, dvp, &vp, &cnp); |
| 839 | if (error == 0 && vp->v_type == VDIR) |
| 840 | error = EPERM; |
| 841 | if (error == 0) { |
| 842 | KKASSERT((cnp.cn_flags & CNP_PDIRUNLOCK) == 0); |
| 843 | error = VOP_OLD_REMOVE(dvp, vp, &cnp); |
| 844 | if (error == 0) { |
| 845 | cache_setunresolved(nch); |
| 846 | cache_setvp(nch, NULL); |
| 847 | cache_inval_vp(vp, CINV_DESTROY); |
| 848 | } |
| 849 | } |
| 850 | if (vp) { |
| 851 | if (dvp == vp) |
| 852 | vrele(vp); |
| 853 | else |
| 854 | vput(vp); |
| 855 | } |
| 856 | if ((cnp.cn_flags & CNP_PDIRUNLOCK) == 0) |
| 857 | vn_unlock(dvp); |
| 858 | vrele(dvp); |
| 859 | return (error); |
| 860 | } |
| 861 | |
| 862 | /* |
| 863 | * vop_compat_nrmdir { struct nchandle *a_nch, XXX STOPGAP FUNCTION |
| 864 | * struct vnode *dvp, |
| 865 | * struct ucred *a_cred } |
| 866 | */ |
| 867 | int |
| 868 | vop_compat_nrmdir(struct vop_nrmdir_args *ap) |
| 869 | { |
| 870 | struct thread *td = curthread; |
| 871 | struct componentname cnp; |
| 872 | struct nchandle *nch; |
| 873 | struct namecache *ncp; |
| 874 | struct vnode *dvp; |
| 875 | struct vnode *vp; |
| 876 | int error; |
| 877 | |
| 878 | /* |
| 879 | * Sanity checks, get a locked directory vnode. |
| 880 | */ |
| 881 | nch = ap->a_nch; /* locked namecache node */ |
| 882 | ncp = nch->ncp; |
| 883 | dvp = ap->a_dvp; |
| 884 | |
| 885 | if ((error = vget(dvp, LK_EXCLUSIVE)) != 0) { |
| 886 | kprintf("[diagnostic] vop_compat_resolve: EAGAIN on ncp %p %s\n", |
| 887 | ncp, ncp->nc_name); |
| 888 | return(EAGAIN); |
| 889 | } |
| 890 | |
| 891 | /* |
| 892 | * Setup the cnp for a traditional vop_old_lookup() call. The lookup |
| 893 | * caches all information required to delete the entry in the |
| 894 | * directory inode. We expect a return code of 0 for the DELETE |
| 895 | * case (meaning that a vp has been found). The cnp must simulated |
| 896 | * a saved-name situation. |
| 897 | */ |
| 898 | bzero(&cnp, sizeof(cnp)); |
| 899 | cnp.cn_nameiop = NAMEI_DELETE; |
| 900 | cnp.cn_flags = CNP_LOCKPARENT; |
| 901 | cnp.cn_nameptr = ncp->nc_name; |
| 902 | cnp.cn_namelen = ncp->nc_nlen; |
| 903 | cnp.cn_cred = ap->a_cred; |
| 904 | cnp.cn_td = td; |
| 905 | |
| 906 | /* |
| 907 | * The vnode must be a directory and must not represent the |
| 908 | * current directory. |
| 909 | */ |
| 910 | vp = NULL; |
| 911 | error = vop_old_lookup(ap->a_head.a_ops, dvp, &vp, &cnp); |
| 912 | if (error == 0 && vp->v_type != VDIR) |
| 913 | error = ENOTDIR; |
| 914 | if (error == 0 && vp == dvp) |
| 915 | error = EINVAL; |
| 916 | if (error == 0 && (vp->v_flag & VROOT)) |
| 917 | error = EBUSY; |
| 918 | if (error == 0) { |
| 919 | KKASSERT((cnp.cn_flags & CNP_PDIRUNLOCK) == 0); |
| 920 | error = VOP_OLD_RMDIR(dvp, vp, &cnp); |
| 921 | |
| 922 | /* |
| 923 | * Note that this invalidation will cause any process |
| 924 | * currently CD'd into the directory being removed to be |
| 925 | * disconnected from the topology and not be able to ".." |
| 926 | * back out. |
| 927 | */ |
| 928 | if (error == 0) { |
| 929 | cache_inval(nch, CINV_DESTROY); |
| 930 | cache_inval_vp(vp, CINV_DESTROY); |
| 931 | } |
| 932 | } |
| 933 | if (vp) { |
| 934 | if (dvp == vp) |
| 935 | vrele(vp); |
| 936 | else |
| 937 | vput(vp); |
| 938 | } |
| 939 | if ((cnp.cn_flags & CNP_PDIRUNLOCK) == 0) |
| 940 | vn_unlock(dvp); |
| 941 | vrele(dvp); |
| 942 | return (error); |
| 943 | } |
| 944 | |
| 945 | /* |
| 946 | * vop_compat_nrename { struct nchandle *a_fnch, XXX STOPGAP FUNCTION |
| 947 | * struct nchandle *a_tnch, |
| 948 | * struct ucred *a_cred } |
| 949 | * |
| 950 | * This is a fairly difficult procedure. The old VOP_OLD_RENAME requires that |
| 951 | * the source directory and vnode be unlocked and the target directory and |
| 952 | * vnode (if it exists) be locked. All arguments will be vrele'd and |
| 953 | * the targets will also be unlocked regardless of the return code. |
| 954 | */ |
| 955 | int |
| 956 | vop_compat_nrename(struct vop_nrename_args *ap) |
| 957 | { |
| 958 | struct thread *td = curthread; |
| 959 | struct componentname fcnp; |
| 960 | struct componentname tcnp; |
| 961 | struct nchandle *fnch; |
| 962 | struct nchandle *tnch; |
| 963 | struct namecache *fncp; |
| 964 | struct namecache *tncp; |
| 965 | struct vnode *fdvp, *fvp; |
| 966 | struct vnode *tdvp, *tvp; |
| 967 | int error; |
| 968 | |
| 969 | /* |
| 970 | * Sanity checks, get referenced vnodes representing the source. |
| 971 | */ |
| 972 | fnch = ap->a_fnch; /* locked namecache node */ |
| 973 | fncp = fnch->ncp; |
| 974 | fdvp = ap->a_fdvp; |
| 975 | |
| 976 | /* |
| 977 | * Temporarily lock the source directory and lookup in DELETE mode to |
| 978 | * check permissions. XXX delete permissions should have been |
| 979 | * checked by nlookup(), we need to add NLC_DELETE for delete |
| 980 | * checking. It is unclear whether VFS's require the directory setup |
| 981 | * info NAMEI_DELETE causes to be stored in the fdvp's inode, but |
| 982 | * since it isn't locked and since UFS always does a relookup of |
| 983 | * the source, it is believed that the only side effect that matters |
| 984 | * is the permissions check. |
| 985 | */ |
| 986 | if ((error = vget(fdvp, LK_EXCLUSIVE)) != 0) { |
| 987 | kprintf("[diagnostic] vop_compat_resolve: EAGAIN on ncp %p %s\n", |
| 988 | fncp, fncp->nc_name); |
| 989 | return(EAGAIN); |
| 990 | } |
| 991 | |
| 992 | bzero(&fcnp, sizeof(fcnp)); |
| 993 | fcnp.cn_nameiop = NAMEI_DELETE; |
| 994 | fcnp.cn_flags = CNP_LOCKPARENT; |
| 995 | fcnp.cn_nameptr = fncp->nc_name; |
| 996 | fcnp.cn_namelen = fncp->nc_nlen; |
| 997 | fcnp.cn_cred = ap->a_cred; |
| 998 | fcnp.cn_td = td; |
| 999 | |
| 1000 | /* |
| 1001 | * note: vop_old_lookup (i.e. VOP_OLD_LOOKUP) always returns a locked |
| 1002 | * fvp. |
| 1003 | */ |
| 1004 | fvp = NULL; |
| 1005 | error = vop_old_lookup(ap->a_head.a_ops, fdvp, &fvp, &fcnp); |
| 1006 | if (error == 0 && (fvp->v_flag & VROOT)) { |
| 1007 | vput(fvp); /* as if vop_old_lookup had failed */ |
| 1008 | error = EBUSY; |
| 1009 | } |
| 1010 | if ((fcnp.cn_flags & CNP_PDIRUNLOCK) == 0) { |
| 1011 | fcnp.cn_flags |= CNP_PDIRUNLOCK; |
| 1012 | vn_unlock(fdvp); |
| 1013 | } |
| 1014 | if (error) { |
| 1015 | vrele(fdvp); |
| 1016 | return (error); |
| 1017 | } |
| 1018 | vn_unlock(fvp); |
| 1019 | |
| 1020 | /* |
| 1021 | * fdvp and fvp are now referenced and unlocked. |
| 1022 | * |
| 1023 | * Get a locked directory vnode for the target and lookup the target |
| 1024 | * in CREATE mode so it places the required information in the |
| 1025 | * directory inode. |
| 1026 | */ |
| 1027 | tnch = ap->a_tnch; /* locked namecache node */ |
| 1028 | tncp = tnch->ncp; |
| 1029 | tdvp = ap->a_tdvp; |
| 1030 | if (error) { |
| 1031 | vrele(fdvp); |
| 1032 | vrele(fvp); |
| 1033 | return (error); |
| 1034 | } |
| 1035 | if ((error = vget(tdvp, LK_EXCLUSIVE)) != 0) { |
| 1036 | kprintf("[diagnostic] vop_compat_resolve: EAGAIN on ncp %p %s\n", |
| 1037 | tncp, tncp->nc_name); |
| 1038 | vrele(fdvp); |
| 1039 | vrele(fvp); |
| 1040 | return(EAGAIN); |
| 1041 | } |
| 1042 | |
| 1043 | /* |
| 1044 | * Setup the cnp for a traditional vop_old_lookup() call. The lookup |
| 1045 | * caches all information required to create the entry in the |
| 1046 | * target directory inode. |
| 1047 | */ |
| 1048 | bzero(&tcnp, sizeof(tcnp)); |
| 1049 | tcnp.cn_nameiop = NAMEI_RENAME; |
| 1050 | tcnp.cn_flags = CNP_LOCKPARENT; |
| 1051 | tcnp.cn_nameptr = tncp->nc_name; |
| 1052 | tcnp.cn_namelen = tncp->nc_nlen; |
| 1053 | tcnp.cn_cred = ap->a_cred; |
| 1054 | tcnp.cn_td = td; |
| 1055 | |
| 1056 | tvp = NULL; |
| 1057 | error = vop_old_lookup(ap->a_head.a_ops, tdvp, &tvp, &tcnp); |
| 1058 | |
| 1059 | if (error == EJUSTRETURN) { |
| 1060 | /* |
| 1061 | * Target does not exist. tvp should be NULL. |
| 1062 | */ |
| 1063 | KKASSERT(tvp == NULL); |
| 1064 | KKASSERT((tcnp.cn_flags & CNP_PDIRUNLOCK) == 0); |
| 1065 | error = VOP_OLD_RENAME(fdvp, fvp, &fcnp, tdvp, tvp, &tcnp); |
| 1066 | if (error == 0) |
| 1067 | cache_rename(fnch, tnch); |
| 1068 | } else if (error == 0) { |
| 1069 | /* |
| 1070 | * Target exists. VOP_OLD_RENAME should correctly delete the |
| 1071 | * target. |
| 1072 | */ |
| 1073 | KKASSERT((tcnp.cn_flags & CNP_PDIRUNLOCK) == 0); |
| 1074 | error = VOP_OLD_RENAME(fdvp, fvp, &fcnp, tdvp, tvp, &tcnp); |
| 1075 | if (error == 0) |
| 1076 | cache_rename(fnch, tnch); |
| 1077 | } else { |
| 1078 | vrele(fdvp); |
| 1079 | vrele(fvp); |
| 1080 | if (tcnp.cn_flags & CNP_PDIRUNLOCK) |
| 1081 | vrele(tdvp); |
| 1082 | else |
| 1083 | vput(tdvp); |
| 1084 | } |
| 1085 | return (error); |
| 1086 | } |
| 1087 | |
| 1088 | static int |
| 1089 | vop_nolookup(struct vop_old_lookup_args *ap) |
| 1090 | { |
| 1091 | |
| 1092 | *ap->a_vpp = NULL; |
| 1093 | return (ENOTDIR); |
| 1094 | } |
| 1095 | |
| 1096 | /* |
| 1097 | * vop_nostrategy: |
| 1098 | * |
| 1099 | * Strategy routine for VFS devices that have none. |
| 1100 | * |
| 1101 | * B_ERROR and B_INVAL must be cleared prior to calling any strategy |
| 1102 | * routine. Typically this is done for a BUF_CMD_READ strategy call. |
| 1103 | * Typically B_INVAL is assumed to already be clear prior to a write |
| 1104 | * and should not be cleared manually unless you just made the buffer |
| 1105 | * invalid. B_ERROR should be cleared either way. |
| 1106 | */ |
| 1107 | |
| 1108 | static int |
| 1109 | vop_nostrategy (struct vop_strategy_args *ap) |
| 1110 | { |
| 1111 | kprintf("No strategy for buffer at %p\n", ap->a_bio->bio_buf); |
| 1112 | vprint("", ap->a_vp); |
| 1113 | ap->a_bio->bio_buf->b_flags |= B_ERROR; |
| 1114 | ap->a_bio->bio_buf->b_error = EOPNOTSUPP; |
| 1115 | biodone(ap->a_bio); |
| 1116 | return (EOPNOTSUPP); |
| 1117 | } |
| 1118 | |
| 1119 | int |
| 1120 | vop_stdpathconf(struct vop_pathconf_args *ap) |
| 1121 | { |
| 1122 | int error = 0; |
| 1123 | |
| 1124 | switch (ap->a_name) { |
| 1125 | case _PC_LINK_MAX: |
| 1126 | *ap->a_retval = LINK_MAX; |
| 1127 | break; |
| 1128 | case _PC_NAME_MAX: |
| 1129 | *ap->a_retval = NAME_MAX; |
| 1130 | break; |
| 1131 | case _PC_PATH_MAX: |
| 1132 | *ap->a_retval = PATH_MAX; |
| 1133 | break; |
| 1134 | case _PC_MAX_CANON: |
| 1135 | *ap->a_retval = MAX_CANON; |
| 1136 | break; |
| 1137 | case _PC_MAX_INPUT: |
| 1138 | *ap->a_retval = MAX_INPUT; |
| 1139 | break; |
| 1140 | case _PC_PIPE_BUF: |
| 1141 | *ap->a_retval = PIPE_BUF; |
| 1142 | break; |
| 1143 | case _PC_CHOWN_RESTRICTED: |
| 1144 | *ap->a_retval = 1; |
| 1145 | break; |
| 1146 | case _PC_NO_TRUNC: |
| 1147 | *ap->a_retval = 1; |
| 1148 | break; |
| 1149 | case _PC_VDISABLE: |
| 1150 | *ap->a_retval = _POSIX_VDISABLE; |
| 1151 | break; |
| 1152 | default: |
| 1153 | error = EINVAL; |
| 1154 | break; |
| 1155 | } |
| 1156 | return (error); |
| 1157 | } |
| 1158 | |
| 1159 | /* |
| 1160 | * Standard open. |
| 1161 | * |
| 1162 | * (struct vnode *a_vp, int a_mode, struct ucred *a_ucred, struct file *a_fp) |
| 1163 | * |
| 1164 | * a_mode: note, 'F' modes, e.g. FREAD, FWRITE |
| 1165 | */ |
| 1166 | int |
| 1167 | vop_stdopen(struct vop_open_args *ap) |
| 1168 | { |
| 1169 | struct vnode *vp = ap->a_vp; |
| 1170 | struct file *fp; |
| 1171 | |
| 1172 | if ((fp = ap->a_fp) != NULL) { |
| 1173 | switch(vp->v_type) { |
| 1174 | case VFIFO: |
| 1175 | fp->f_type = DTYPE_FIFO; |
| 1176 | break; |
| 1177 | default: |
| 1178 | fp->f_type = DTYPE_VNODE; |
| 1179 | break; |
| 1180 | } |
| 1181 | fp->f_flag = ap->a_mode & FMASK; |
| 1182 | fp->f_ops = &vnode_fileops; |
| 1183 | fp->f_data = vp; |
| 1184 | vref(vp); |
| 1185 | } |
| 1186 | if (ap->a_mode & FWRITE) |
| 1187 | ++vp->v_writecount; |
| 1188 | KKASSERT(vp->v_opencount >= 0 && vp->v_opencount != INT_MAX); |
| 1189 | ++vp->v_opencount; |
| 1190 | return (0); |
| 1191 | } |
| 1192 | |
| 1193 | /* |
| 1194 | * Standard close. |
| 1195 | * |
| 1196 | * (struct vnode *a_vp, int a_fflag) |
| 1197 | * |
| 1198 | * a_fflag: note, 'F' modes, e.g. FREAD, FWRITE. same as a_mode in stdopen? |
| 1199 | */ |
| 1200 | int |
| 1201 | vop_stdclose(struct vop_close_args *ap) |
| 1202 | { |
| 1203 | struct vnode *vp = ap->a_vp; |
| 1204 | |
| 1205 | KASSERT(vp->v_opencount > 0, |
| 1206 | ("VOP_STDCLOSE: BAD OPENCOUNT %p %d type=%d ops=%p flgs=%08x\n", |
| 1207 | vp, vp->v_opencount, vp->v_type, *vp->v_ops, vp->v_flag)); |
| 1208 | if (ap->a_fflag & FWRITE) { |
| 1209 | KASSERT(vp->v_writecount > 0, |
| 1210 | ("VOP_STDCLOSE: BAD WRITECOUNT %p %d\n", |
| 1211 | vp, vp->v_writecount)); |
| 1212 | --vp->v_writecount; |
| 1213 | } |
| 1214 | --vp->v_opencount; |
| 1215 | return (0); |
| 1216 | } |
| 1217 | |
| 1218 | /* |
| 1219 | * Return true for select/poll. |
| 1220 | */ |
| 1221 | int |
| 1222 | vop_nopoll(struct vop_poll_args *ap) |
| 1223 | { |
| 1224 | /* |
| 1225 | * Return true for read/write. If the user asked for something |
| 1226 | * special, return POLLNVAL, so that clients have a way of |
| 1227 | * determining reliably whether or not the extended |
| 1228 | * functionality is present without hard-coding knowledge |
| 1229 | * of specific filesystem implementations. |
| 1230 | */ |
| 1231 | if (ap->a_events & ~POLLSTANDARD) |
| 1232 | return (POLLNVAL); |
| 1233 | |
| 1234 | return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); |
| 1235 | } |
| 1236 | |
| 1237 | /* |
| 1238 | * Implement poll for local filesystems that support it. |
| 1239 | */ |
| 1240 | int |
| 1241 | vop_stdpoll(struct vop_poll_args *ap) |
| 1242 | { |
| 1243 | if (ap->a_events & ~POLLSTANDARD) |
| 1244 | return (vn_pollrecord(ap->a_vp, ap->a_events)); |
| 1245 | return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); |
| 1246 | } |
| 1247 | |
| 1248 | /* |
| 1249 | * Implement standard getpages and putpages. All filesystems must use |
| 1250 | * the buffer cache to back regular files. |
| 1251 | */ |
| 1252 | int |
| 1253 | vop_stdgetpages(struct vop_getpages_args *ap) |
| 1254 | { |
| 1255 | struct mount *mp; |
| 1256 | int error; |
| 1257 | |
| 1258 | if ((mp = ap->a_vp->v_mount) != NULL) { |
| 1259 | error = vnode_pager_generic_getpages( |
| 1260 | ap->a_vp, ap->a_m, ap->a_count, |
| 1261 | ap->a_reqpage, ap->a_seqaccess); |
| 1262 | } else { |
| 1263 | error = VM_PAGER_BAD; |
| 1264 | } |
| 1265 | return (error); |
| 1266 | } |
| 1267 | |
| 1268 | int |
| 1269 | vop_stdputpages(struct vop_putpages_args *ap) |
| 1270 | { |
| 1271 | struct mount *mp; |
| 1272 | int error; |
| 1273 | |
| 1274 | if ((mp = ap->a_vp->v_mount) != NULL) { |
| 1275 | error = vnode_pager_generic_putpages( |
| 1276 | ap->a_vp, ap->a_m, ap->a_count, |
| 1277 | ap->a_sync, ap->a_rtvals); |
| 1278 | } else { |
| 1279 | error = VM_PAGER_BAD; |
| 1280 | } |
| 1281 | return (error); |
| 1282 | } |
| 1283 | |
| 1284 | int |
| 1285 | vop_stdnoread(struct vop_read_args *ap) |
| 1286 | { |
| 1287 | return (EINVAL); |
| 1288 | } |
| 1289 | |
| 1290 | int |
| 1291 | vop_stdnowrite(struct vop_write_args *ap) |
| 1292 | { |
| 1293 | return (EINVAL); |
| 1294 | } |
| 1295 | |
| 1296 | /* |
| 1297 | * vfs default ops |
| 1298 | * used to fill the vfs fucntion table to get reasonable default return values. |
| 1299 | */ |
| 1300 | int |
| 1301 | vfs_stdmount(struct mount *mp, char *path, caddr_t data, struct ucred *cred) |
| 1302 | { |
| 1303 | return (0); |
| 1304 | } |
| 1305 | |
| 1306 | int |
| 1307 | vfs_stdunmount(struct mount *mp, int mntflags) |
| 1308 | { |
| 1309 | return (0); |
| 1310 | } |
| 1311 | |
| 1312 | int |
| 1313 | vop_stdmountctl(struct vop_mountctl_args *ap) |
| 1314 | { |
| 1315 | |
| 1316 | struct mount *mp; |
| 1317 | int error = 0; |
| 1318 | |
| 1319 | mp = ap->a_head.a_ops->head.vv_mount; |
| 1320 | |
| 1321 | switch(ap->a_op) { |
| 1322 | case MOUNTCTL_MOUNTFLAGS: |
| 1323 | /* |
| 1324 | * Get a string buffer with all the mount flags |
| 1325 | * names comman separated. |
| 1326 | * mount(2) will use this information. |
| 1327 | */ |
| 1328 | *ap->a_res = vfs_flagstostr(mp->mnt_flag & MNT_VISFLAGMASK, NULL, |
| 1329 | ap->a_buf, ap->a_buflen, &error); |
| 1330 | break; |
| 1331 | case MOUNTCTL_INSTALL_VFS_JOURNAL: |
| 1332 | case MOUNTCTL_RESTART_VFS_JOURNAL: |
| 1333 | case MOUNTCTL_REMOVE_VFS_JOURNAL: |
| 1334 | case MOUNTCTL_RESYNC_VFS_JOURNAL: |
| 1335 | case MOUNTCTL_STATUS_VFS_JOURNAL: |
| 1336 | error = journal_mountctl(ap); |
| 1337 | break; |
| 1338 | default: |
| 1339 | error = EOPNOTSUPP; |
| 1340 | break; |
| 1341 | } |
| 1342 | return (error); |
| 1343 | } |
| 1344 | |
| 1345 | int |
| 1346 | vfs_stdroot(struct mount *mp, struct vnode **vpp) |
| 1347 | { |
| 1348 | return (EOPNOTSUPP); |
| 1349 | } |
| 1350 | |
| 1351 | int |
| 1352 | vfs_stdstatfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) |
| 1353 | { |
| 1354 | return (EOPNOTSUPP); |
| 1355 | } |
| 1356 | |
| 1357 | /* |
| 1358 | * If the VFS does not implement statvfs, then call statfs and convert |
| 1359 | * the values. This code was taken from libc's __cvtstatvfs() function, |
| 1360 | * contributed by Joerg Sonnenberger. |
| 1361 | */ |
| 1362 | int |
| 1363 | vfs_stdstatvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred) |
| 1364 | { |
| 1365 | struct statfs *in; |
| 1366 | int error; |
| 1367 | |
| 1368 | in = &mp->mnt_stat; |
| 1369 | error = VFS_STATFS(mp, in, cred); |
| 1370 | if (error == 0) { |
| 1371 | bzero(sbp, sizeof(*sbp)); |
| 1372 | |
| 1373 | sbp->f_bsize = in->f_bsize; |
| 1374 | sbp->f_frsize = in->f_bsize; |
| 1375 | sbp->f_blocks = in->f_blocks; |
| 1376 | sbp->f_bfree = in->f_bfree; |
| 1377 | sbp->f_bavail = in->f_bavail; |
| 1378 | sbp->f_files = in->f_files; |
| 1379 | sbp->f_ffree = in->f_ffree; |
| 1380 | |
| 1381 | /* |
| 1382 | * XXX |
| 1383 | * This field counts the number of available inodes to non-root |
| 1384 | * users, but this information is not available via statfs. |
| 1385 | * Just ignore this issue by returning the total number |
| 1386 | * instead. |
| 1387 | */ |
| 1388 | sbp->f_favail = in->f_ffree; |
| 1389 | |
| 1390 | /* |
| 1391 | * XXX |
| 1392 | * This field has a different meaning for statfs and statvfs. |
| 1393 | * For the former it is the cookie exported for NFS and not |
| 1394 | * intended for normal userland use. |
| 1395 | */ |
| 1396 | sbp->f_fsid = 0; |
| 1397 | |
| 1398 | sbp->f_flag = 0; |
| 1399 | if (in->f_flags & MNT_RDONLY) |
| 1400 | sbp->f_flag |= ST_RDONLY; |
| 1401 | if (in->f_flags & MNT_NOSUID) |
| 1402 | sbp->f_flag |= ST_NOSUID; |
| 1403 | sbp->f_namemax = 0; |
| 1404 | sbp->f_owner = in->f_owner; |
| 1405 | /* |
| 1406 | * XXX |
| 1407 | * statfs contains the type as string, statvfs expects it as |
| 1408 | * enumeration. |
| 1409 | */ |
| 1410 | sbp->f_type = 0; |
| 1411 | |
| 1412 | sbp->f_syncreads = in->f_syncreads; |
| 1413 | sbp->f_syncwrites = in->f_syncwrites; |
| 1414 | sbp->f_asyncreads = in->f_asyncreads; |
| 1415 | sbp->f_asyncwrites = in->f_asyncwrites; |
| 1416 | } |
| 1417 | return (error); |
| 1418 | } |
| 1419 | |
| 1420 | int |
| 1421 | vfs_stdvptofh(struct vnode *vp, struct fid *fhp) |
| 1422 | { |
| 1423 | return (EOPNOTSUPP); |
| 1424 | } |
| 1425 | |
| 1426 | int |
| 1427 | vfs_stdstart(struct mount *mp, int flags) |
| 1428 | { |
| 1429 | return (0); |
| 1430 | } |
| 1431 | |
| 1432 | int |
| 1433 | vfs_stdquotactl(struct mount *mp, int cmds, uid_t uid, |
| 1434 | caddr_t arg, struct ucred *cred) |
| 1435 | { |
| 1436 | return (EOPNOTSUPP); |
| 1437 | } |
| 1438 | |
| 1439 | int |
| 1440 | vfs_stdsync(struct mount *mp, int waitfor) |
| 1441 | { |
| 1442 | return (0); |
| 1443 | } |
| 1444 | |
| 1445 | int |
| 1446 | vfs_stdnosync(struct mount *mp, int waitfor) |
| 1447 | { |
| 1448 | return (EOPNOTSUPP); |
| 1449 | } |
| 1450 | |
| 1451 | int |
| 1452 | vfs_stdvget(struct mount *mp, struct vnode *dvp, ino_t ino, struct vnode **vpp) |
| 1453 | { |
| 1454 | return (EOPNOTSUPP); |
| 1455 | } |
| 1456 | |
| 1457 | int |
| 1458 | vfs_stdfhtovp(struct mount *mp, struct vnode *rootvp, |
| 1459 | struct fid *fhp, struct vnode **vpp) |
| 1460 | { |
| 1461 | return (EOPNOTSUPP); |
| 1462 | } |
| 1463 | |
| 1464 | int |
| 1465 | vfs_stdcheckexp(struct mount *mp, struct sockaddr *nam, int *extflagsp, |
| 1466 | struct ucred **credanonp) |
| 1467 | { |
| 1468 | return (EOPNOTSUPP); |
| 1469 | } |
| 1470 | |
| 1471 | int |
| 1472 | vfs_stdinit(struct vfsconf *vfsp) |
| 1473 | { |
| 1474 | return (0); |
| 1475 | } |
| 1476 | |
| 1477 | int |
| 1478 | vfs_stduninit(struct vfsconf *vfsp) |
| 1479 | { |
| 1480 | return(0); |
| 1481 | } |
| 1482 | |
| 1483 | int |
| 1484 | vfs_stdextattrctl(struct mount *mp, int cmd, struct vnode *vp, |
| 1485 | int attrnamespace, const char *attrname, |
| 1486 | struct ucred *cred) |
| 1487 | { |
| 1488 | return(EOPNOTSUPP); |
| 1489 | } |
| 1490 | |
| 1491 | /* end of vfs default ops */ |