| 1 | /* $NetBSD: tmpfs_vnops.c,v 1.128 2016/08/20 12:37:08 hannken Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 2005, 2006, 2007 The NetBSD Foundation, Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * This code is derived from software contributed to The NetBSD Foundation |
| 8 | * by Julio M. Merino Vidal, developed as part of Google's Summer of Code |
| 9 | * 2005 program. |
| 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 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 21 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 22 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 23 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 24 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 25 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 26 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 27 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 28 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 29 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 30 | * POSSIBILITY OF SUCH DAMAGE. |
| 31 | */ |
| 32 | |
| 33 | /* |
| 34 | * tmpfs vnode interface. |
| 35 | */ |
| 36 | |
| 37 | #include <sys/cdefs.h> |
| 38 | __KERNEL_RCSID(0, "$NetBSD: tmpfs_vnops.c,v 1.128 2016/08/20 12:37:08 hannken Exp $" ); |
| 39 | |
| 40 | #include <sys/param.h> |
| 41 | #include <sys/dirent.h> |
| 42 | #include <sys/fcntl.h> |
| 43 | #include <sys/event.h> |
| 44 | #include <sys/malloc.h> |
| 45 | #include <sys/namei.h> |
| 46 | #include <sys/stat.h> |
| 47 | #include <sys/uio.h> |
| 48 | #include <sys/unistd.h> |
| 49 | #include <sys/vnode.h> |
| 50 | #include <sys/lockf.h> |
| 51 | #include <sys/kauth.h> |
| 52 | #include <sys/atomic.h> |
| 53 | |
| 54 | #include <uvm/uvm.h> |
| 55 | |
| 56 | #include <miscfs/fifofs/fifo.h> |
| 57 | #include <miscfs/genfs/genfs.h> |
| 58 | #include <fs/tmpfs/tmpfs_vnops.h> |
| 59 | #include <fs/tmpfs/tmpfs.h> |
| 60 | |
| 61 | /* |
| 62 | * vnode operations vector used for files stored in a tmpfs file system. |
| 63 | */ |
| 64 | int (**tmpfs_vnodeop_p)(void *); |
| 65 | const struct vnodeopv_entry_desc tmpfs_vnodeop_entries[] = { |
| 66 | { &vop_default_desc, vn_default_error }, |
| 67 | { &vop_lookup_desc, tmpfs_lookup }, |
| 68 | { &vop_create_desc, tmpfs_create }, |
| 69 | { &vop_mknod_desc, tmpfs_mknod }, |
| 70 | { &vop_open_desc, tmpfs_open }, |
| 71 | { &vop_close_desc, tmpfs_close }, |
| 72 | { &vop_access_desc, tmpfs_access }, |
| 73 | { &vop_getattr_desc, tmpfs_getattr }, |
| 74 | { &vop_setattr_desc, tmpfs_setattr }, |
| 75 | { &vop_read_desc, tmpfs_read }, |
| 76 | { &vop_write_desc, tmpfs_write }, |
| 77 | { &vop_fallocate_desc, genfs_eopnotsupp }, |
| 78 | { &vop_fdiscard_desc, genfs_eopnotsupp }, |
| 79 | { &vop_ioctl_desc, tmpfs_ioctl }, |
| 80 | { &vop_fcntl_desc, tmpfs_fcntl }, |
| 81 | { &vop_poll_desc, tmpfs_poll }, |
| 82 | { &vop_kqfilter_desc, tmpfs_kqfilter }, |
| 83 | { &vop_revoke_desc, tmpfs_revoke }, |
| 84 | { &vop_mmap_desc, tmpfs_mmap }, |
| 85 | { &vop_fsync_desc, tmpfs_fsync }, |
| 86 | { &vop_seek_desc, tmpfs_seek }, |
| 87 | { &vop_remove_desc, tmpfs_remove }, |
| 88 | { &vop_link_desc, tmpfs_link }, |
| 89 | { &vop_rename_desc, tmpfs_rename }, |
| 90 | { &vop_mkdir_desc, tmpfs_mkdir }, |
| 91 | { &vop_rmdir_desc, tmpfs_rmdir }, |
| 92 | { &vop_symlink_desc, tmpfs_symlink }, |
| 93 | { &vop_readdir_desc, tmpfs_readdir }, |
| 94 | { &vop_readlink_desc, tmpfs_readlink }, |
| 95 | { &vop_abortop_desc, tmpfs_abortop }, |
| 96 | { &vop_inactive_desc, tmpfs_inactive }, |
| 97 | { &vop_reclaim_desc, tmpfs_reclaim }, |
| 98 | { &vop_lock_desc, tmpfs_lock }, |
| 99 | { &vop_unlock_desc, tmpfs_unlock }, |
| 100 | { &vop_bmap_desc, tmpfs_bmap }, |
| 101 | { &vop_strategy_desc, tmpfs_strategy }, |
| 102 | { &vop_print_desc, tmpfs_print }, |
| 103 | { &vop_pathconf_desc, tmpfs_pathconf }, |
| 104 | { &vop_islocked_desc, tmpfs_islocked }, |
| 105 | { &vop_advlock_desc, tmpfs_advlock }, |
| 106 | { &vop_bwrite_desc, tmpfs_bwrite }, |
| 107 | { &vop_getpages_desc, tmpfs_getpages }, |
| 108 | { &vop_putpages_desc, tmpfs_putpages }, |
| 109 | { &vop_whiteout_desc, tmpfs_whiteout }, |
| 110 | { NULL, NULL } |
| 111 | }; |
| 112 | |
| 113 | const struct vnodeopv_desc tmpfs_vnodeop_opv_desc = { |
| 114 | &tmpfs_vnodeop_p, tmpfs_vnodeop_entries |
| 115 | }; |
| 116 | |
| 117 | /* |
| 118 | * tmpfs_lookup: path name traversal routine. |
| 119 | * |
| 120 | * Arguments: dvp (directory being searched), vpp (result), |
| 121 | * cnp (component name - path). |
| 122 | * |
| 123 | * => Caller holds a reference and lock on dvp. |
| 124 | * => We return looked-up vnode (vpp) locked, with a reference held. |
| 125 | */ |
| 126 | int |
| 127 | tmpfs_lookup(void *v) |
| 128 | { |
| 129 | struct vop_lookup_v2_args /* { |
| 130 | struct vnode *a_dvp; |
| 131 | struct vnode **a_vpp; |
| 132 | struct componentname *a_cnp; |
| 133 | } */ *ap = v; |
| 134 | vnode_t *dvp = ap->a_dvp, **vpp = ap->a_vpp; |
| 135 | struct componentname *cnp = ap->a_cnp; |
| 136 | const bool lastcn = (cnp->cn_flags & ISLASTCN) != 0; |
| 137 | tmpfs_node_t *dnode, *tnode; |
| 138 | tmpfs_dirent_t *de; |
| 139 | int cachefound, iswhiteout; |
| 140 | int error; |
| 141 | |
| 142 | KASSERT(VOP_ISLOCKED(dvp)); |
| 143 | |
| 144 | dnode = VP_TO_TMPFS_DIR(dvp); |
| 145 | *vpp = NULL; |
| 146 | |
| 147 | /* Check accessibility of directory. */ |
| 148 | error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred); |
| 149 | if (error) { |
| 150 | goto out; |
| 151 | } |
| 152 | |
| 153 | /* |
| 154 | * If requesting the last path component on a read-only file system |
| 155 | * with a write operation, deny it. |
| 156 | */ |
| 157 | if (lastcn && (dvp->v_mount->mnt_flag & MNT_RDONLY) != 0 && |
| 158 | (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) { |
| 159 | error = EROFS; |
| 160 | goto out; |
| 161 | } |
| 162 | |
| 163 | /* |
| 164 | * Avoid doing a linear scan of the directory if the requested |
| 165 | * directory/name couple is already in the cache. |
| 166 | */ |
| 167 | cachefound = cache_lookup(dvp, cnp->cn_nameptr, cnp->cn_namelen, |
| 168 | cnp->cn_nameiop, cnp->cn_flags, |
| 169 | &iswhiteout, vpp); |
| 170 | if (iswhiteout) { |
| 171 | cnp->cn_flags |= ISWHITEOUT; |
| 172 | } |
| 173 | if (cachefound && *vpp == NULLVP) { |
| 174 | /* Negative cache hit. */ |
| 175 | error = ENOENT; |
| 176 | goto out; |
| 177 | } else if (cachefound) { |
| 178 | error = 0; |
| 179 | goto out; |
| 180 | } |
| 181 | |
| 182 | /* |
| 183 | * Treat an unlinked directory as empty (no "." or "..") |
| 184 | */ |
| 185 | if (dnode->tn_links == 0) { |
| 186 | KASSERT(dnode->tn_size == 0); |
| 187 | error = ENOENT; |
| 188 | goto out; |
| 189 | } |
| 190 | |
| 191 | if (cnp->cn_flags & ISDOTDOT) { |
| 192 | tmpfs_node_t *pnode; |
| 193 | |
| 194 | /* |
| 195 | * Lookup of ".." case. |
| 196 | */ |
| 197 | if (lastcn && cnp->cn_nameiop == RENAME) { |
| 198 | error = EINVAL; |
| 199 | goto out; |
| 200 | } |
| 201 | KASSERT(dnode->tn_type == VDIR); |
| 202 | pnode = dnode->tn_spec.tn_dir.tn_parent; |
| 203 | if (pnode == NULL) { |
| 204 | error = ENOENT; |
| 205 | goto out; |
| 206 | } |
| 207 | |
| 208 | error = vcache_get(dvp->v_mount, &pnode, sizeof(pnode), vpp); |
| 209 | goto out; |
| 210 | } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { |
| 211 | /* |
| 212 | * Lookup of "." case. |
| 213 | */ |
| 214 | if (lastcn && cnp->cn_nameiop == RENAME) { |
| 215 | error = EISDIR; |
| 216 | goto out; |
| 217 | } |
| 218 | vref(dvp); |
| 219 | *vpp = dvp; |
| 220 | error = 0; |
| 221 | goto done; |
| 222 | } |
| 223 | |
| 224 | /* |
| 225 | * Other lookup cases: perform directory scan. |
| 226 | */ |
| 227 | de = tmpfs_dir_lookup(dnode, cnp); |
| 228 | if (de == NULL || de->td_node == TMPFS_NODE_WHITEOUT) { |
| 229 | /* |
| 230 | * The entry was not found in the directory. This is valid |
| 231 | * if we are creating or renaming an entry and are working |
| 232 | * on the last component of the path name. |
| 233 | */ |
| 234 | if (lastcn && (cnp->cn_nameiop == CREATE || |
| 235 | cnp->cn_nameiop == RENAME)) { |
| 236 | error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred); |
| 237 | if (error) { |
| 238 | goto out; |
| 239 | } |
| 240 | error = EJUSTRETURN; |
| 241 | } else { |
| 242 | error = ENOENT; |
| 243 | } |
| 244 | if (de) { |
| 245 | KASSERT(de->td_node == TMPFS_NODE_WHITEOUT); |
| 246 | cnp->cn_flags |= ISWHITEOUT; |
| 247 | } |
| 248 | goto done; |
| 249 | } |
| 250 | |
| 251 | tnode = de->td_node; |
| 252 | |
| 253 | /* |
| 254 | * If it is not the last path component and found a non-directory |
| 255 | * or non-link entry (which may itself be pointing to a directory), |
| 256 | * raise an error. |
| 257 | */ |
| 258 | if (!lastcn && tnode->tn_type != VDIR && tnode->tn_type != VLNK) { |
| 259 | error = ENOTDIR; |
| 260 | goto out; |
| 261 | } |
| 262 | |
| 263 | /* Check the permissions. */ |
| 264 | if (lastcn && (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) { |
| 265 | error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred); |
| 266 | if (error) |
| 267 | goto out; |
| 268 | |
| 269 | if ((dnode->tn_mode & S_ISTXT) != 0) { |
| 270 | error = kauth_authorize_vnode(cnp->cn_cred, |
| 271 | KAUTH_VNODE_DELETE, tnode->tn_vnode, |
| 272 | dnode->tn_vnode, genfs_can_sticky(cnp->cn_cred, |
| 273 | dnode->tn_uid, tnode->tn_uid)); |
| 274 | if (error) { |
| 275 | error = EPERM; |
| 276 | goto out; |
| 277 | } |
| 278 | } |
| 279 | } |
| 280 | |
| 281 | /* Get a vnode for the matching entry. */ |
| 282 | error = vcache_get(dvp->v_mount, &tnode, sizeof(tnode), vpp); |
| 283 | done: |
| 284 | /* |
| 285 | * Cache the result, unless request was for creation (as it does |
| 286 | * not improve the performance). |
| 287 | */ |
| 288 | if (cnp->cn_nameiop != CREATE) { |
| 289 | cache_enter(dvp, *vpp, cnp->cn_nameptr, cnp->cn_namelen, |
| 290 | cnp->cn_flags); |
| 291 | } |
| 292 | out: |
| 293 | KASSERT(VOP_ISLOCKED(dvp)); |
| 294 | |
| 295 | return error; |
| 296 | } |
| 297 | |
| 298 | int |
| 299 | tmpfs_create(void *v) |
| 300 | { |
| 301 | struct vop_create_v3_args /* { |
| 302 | struct vnode *a_dvp; |
| 303 | struct vnode **a_vpp; |
| 304 | struct componentname *a_cnp; |
| 305 | struct vattr *a_vap; |
| 306 | } */ *ap = v; |
| 307 | vnode_t *dvp = ap->a_dvp, **vpp = ap->a_vpp; |
| 308 | struct componentname *cnp = ap->a_cnp; |
| 309 | struct vattr *vap = ap->a_vap; |
| 310 | |
| 311 | KASSERT(VOP_ISLOCKED(dvp)); |
| 312 | KASSERT(vap->va_type == VREG || vap->va_type == VSOCK); |
| 313 | return tmpfs_construct_node(dvp, vpp, vap, cnp, NULL); |
| 314 | } |
| 315 | |
| 316 | int |
| 317 | tmpfs_mknod(void *v) |
| 318 | { |
| 319 | struct vop_mknod_v3_args /* { |
| 320 | struct vnode *a_dvp; |
| 321 | struct vnode **a_vpp; |
| 322 | struct componentname *a_cnp; |
| 323 | struct vattr *a_vap; |
| 324 | } */ *ap = v; |
| 325 | vnode_t *dvp = ap->a_dvp, **vpp = ap->a_vpp; |
| 326 | struct componentname *cnp = ap->a_cnp; |
| 327 | struct vattr *vap = ap->a_vap; |
| 328 | enum vtype vt = vap->va_type; |
| 329 | |
| 330 | if (vt != VBLK && vt != VCHR && vt != VFIFO) { |
| 331 | *vpp = NULL; |
| 332 | return EINVAL; |
| 333 | } |
| 334 | return tmpfs_construct_node(dvp, vpp, vap, cnp, NULL); |
| 335 | } |
| 336 | |
| 337 | int |
| 338 | tmpfs_open(void *v) |
| 339 | { |
| 340 | struct vop_open_args /* { |
| 341 | struct vnode *a_vp; |
| 342 | int a_mode; |
| 343 | kauth_cred_t a_cred; |
| 344 | } */ *ap = v; |
| 345 | vnode_t *vp = ap->a_vp; |
| 346 | mode_t mode = ap->a_mode; |
| 347 | tmpfs_node_t *node; |
| 348 | |
| 349 | KASSERT(VOP_ISLOCKED(vp)); |
| 350 | |
| 351 | node = VP_TO_TMPFS_NODE(vp); |
| 352 | |
| 353 | /* If the file is marked append-only, deny write requests. */ |
| 354 | if ((node->tn_flags & APPEND) != 0 && |
| 355 | (mode & (FWRITE | O_APPEND)) == FWRITE) { |
| 356 | return EPERM; |
| 357 | } |
| 358 | return 0; |
| 359 | } |
| 360 | |
| 361 | int |
| 362 | tmpfs_close(void *v) |
| 363 | { |
| 364 | struct vop_close_args /* { |
| 365 | struct vnode *a_vp; |
| 366 | int a_fflag; |
| 367 | kauth_cred_t a_cred; |
| 368 | } */ *ap = v; |
| 369 | vnode_t *vp __diagused = ap->a_vp; |
| 370 | |
| 371 | KASSERT(VOP_ISLOCKED(vp)); |
| 372 | return 0; |
| 373 | } |
| 374 | |
| 375 | int |
| 376 | tmpfs_access(void *v) |
| 377 | { |
| 378 | struct vop_access_args /* { |
| 379 | struct vnode *a_vp; |
| 380 | int a_mode; |
| 381 | kauth_cred_t a_cred; |
| 382 | } */ *ap = v; |
| 383 | vnode_t *vp = ap->a_vp; |
| 384 | mode_t mode = ap->a_mode; |
| 385 | kauth_cred_t cred = ap->a_cred; |
| 386 | tmpfs_node_t *node = VP_TO_TMPFS_NODE(vp); |
| 387 | const bool writing = (mode & VWRITE) != 0; |
| 388 | |
| 389 | KASSERT(VOP_ISLOCKED(vp)); |
| 390 | |
| 391 | /* Possible? */ |
| 392 | switch (vp->v_type) { |
| 393 | case VDIR: |
| 394 | case VLNK: |
| 395 | case VREG: |
| 396 | if (writing && (vp->v_mount->mnt_flag & MNT_RDONLY) != 0) { |
| 397 | return EROFS; |
| 398 | } |
| 399 | break; |
| 400 | case VBLK: |
| 401 | case VCHR: |
| 402 | case VSOCK: |
| 403 | case VFIFO: |
| 404 | break; |
| 405 | default: |
| 406 | return EINVAL; |
| 407 | } |
| 408 | if (writing && (node->tn_flags & IMMUTABLE) != 0) { |
| 409 | return EPERM; |
| 410 | } |
| 411 | |
| 412 | return kauth_authorize_vnode(cred, KAUTH_ACCESS_ACTION(mode, |
| 413 | vp->v_type, node->tn_mode), vp, NULL, genfs_can_access(vp->v_type, |
| 414 | node->tn_mode, node->tn_uid, node->tn_gid, mode, cred)); |
| 415 | } |
| 416 | |
| 417 | int |
| 418 | tmpfs_getattr(void *v) |
| 419 | { |
| 420 | struct vop_getattr_args /* { |
| 421 | struct vnode *a_vp; |
| 422 | struct vattr *a_vap; |
| 423 | kauth_cred_t a_cred; |
| 424 | } */ *ap = v; |
| 425 | vnode_t *vp = ap->a_vp; |
| 426 | struct vattr *vap = ap->a_vap; |
| 427 | tmpfs_node_t *node = VP_TO_TMPFS_NODE(vp); |
| 428 | |
| 429 | vattr_null(vap); |
| 430 | |
| 431 | vap->va_type = vp->v_type; |
| 432 | vap->va_mode = node->tn_mode; |
| 433 | vap->va_nlink = node->tn_links; |
| 434 | vap->va_uid = node->tn_uid; |
| 435 | vap->va_gid = node->tn_gid; |
| 436 | vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; |
| 437 | vap->va_fileid = node->tn_id; |
| 438 | vap->va_size = node->tn_size; |
| 439 | vap->va_blocksize = PAGE_SIZE; |
| 440 | vap->va_atime = node->tn_atime; |
| 441 | vap->va_mtime = node->tn_mtime; |
| 442 | vap->va_ctime = node->tn_ctime; |
| 443 | vap->va_birthtime = node->tn_birthtime; |
| 444 | vap->va_gen = TMPFS_NODE_GEN(node); |
| 445 | vap->va_flags = node->tn_flags; |
| 446 | vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? |
| 447 | node->tn_spec.tn_dev.tn_rdev : VNOVAL; |
| 448 | vap->va_bytes = round_page(node->tn_size); |
| 449 | vap->va_filerev = VNOVAL; |
| 450 | vap->va_vaflags = 0; |
| 451 | vap->va_spare = VNOVAL; /* XXX */ |
| 452 | |
| 453 | return 0; |
| 454 | } |
| 455 | |
| 456 | int |
| 457 | tmpfs_setattr(void *v) |
| 458 | { |
| 459 | struct vop_setattr_args /* { |
| 460 | struct vnode *a_vp; |
| 461 | struct vattr *a_vap; |
| 462 | kauth_cred_t a_cred; |
| 463 | } */ *ap = v; |
| 464 | vnode_t *vp = ap->a_vp; |
| 465 | struct vattr *vap = ap->a_vap; |
| 466 | kauth_cred_t cred = ap->a_cred; |
| 467 | lwp_t *l = curlwp; |
| 468 | int error = 0; |
| 469 | |
| 470 | KASSERT(VOP_ISLOCKED(vp)); |
| 471 | |
| 472 | /* Abort if any unsettable attribute is given. */ |
| 473 | if (vap->va_type != VNON || vap->va_nlink != VNOVAL || |
| 474 | vap->va_fsid != VNOVAL || vap->va_fileid != VNOVAL || |
| 475 | vap->va_blocksize != VNOVAL || vap->va_ctime.tv_sec != VNOVAL || |
| 476 | vap->va_gen != VNOVAL || vap->va_rdev != VNOVAL || |
| 477 | vap->va_bytes != VNOVAL) { |
| 478 | return EINVAL; |
| 479 | } |
| 480 | |
| 481 | if (error == 0 && vap->va_flags != VNOVAL) |
| 482 | error = tmpfs_chflags(vp, vap->va_flags, cred, l); |
| 483 | |
| 484 | if (error == 0 && vap->va_size != VNOVAL) |
| 485 | error = tmpfs_chsize(vp, vap->va_size, cred, l); |
| 486 | |
| 487 | if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) |
| 488 | error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, l); |
| 489 | |
| 490 | if (error == 0 && vap->va_mode != VNOVAL) |
| 491 | error = tmpfs_chmod(vp, vap->va_mode, cred, l); |
| 492 | |
| 493 | const bool chsometime = |
| 494 | vap->va_atime.tv_sec != VNOVAL || |
| 495 | vap->va_mtime.tv_sec != VNOVAL || |
| 496 | vap->va_birthtime.tv_sec != VNOVAL; |
| 497 | if (error == 0 && chsometime) { |
| 498 | error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, |
| 499 | &vap->va_birthtime, vap->va_vaflags, cred, l); |
| 500 | } |
| 501 | return error; |
| 502 | } |
| 503 | |
| 504 | int |
| 505 | tmpfs_read(void *v) |
| 506 | { |
| 507 | struct vop_read_args /* { |
| 508 | struct vnode *a_vp; |
| 509 | struct uio *a_uio; |
| 510 | int a_ioflag; |
| 511 | kauth_cred_t a_cred; |
| 512 | } */ *ap = v; |
| 513 | vnode_t *vp = ap->a_vp; |
| 514 | struct uio *uio = ap->a_uio; |
| 515 | const int ioflag = ap->a_ioflag; |
| 516 | tmpfs_node_t *node; |
| 517 | struct uvm_object *uobj; |
| 518 | int error; |
| 519 | |
| 520 | KASSERT(VOP_ISLOCKED(vp)); |
| 521 | |
| 522 | if (vp->v_type == VDIR) { |
| 523 | return EISDIR; |
| 524 | } |
| 525 | if (uio->uio_offset < 0 || vp->v_type != VREG) { |
| 526 | return EINVAL; |
| 527 | } |
| 528 | |
| 529 | /* Note: reading zero bytes should not update atime. */ |
| 530 | if (uio->uio_resid == 0) { |
| 531 | return 0; |
| 532 | } |
| 533 | |
| 534 | node = VP_TO_TMPFS_NODE(vp); |
| 535 | uobj = node->tn_spec.tn_reg.tn_aobj; |
| 536 | error = 0; |
| 537 | |
| 538 | while (error == 0 && uio->uio_resid > 0) { |
| 539 | vsize_t len; |
| 540 | |
| 541 | if (node->tn_size <= uio->uio_offset) { |
| 542 | break; |
| 543 | } |
| 544 | len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); |
| 545 | if (len == 0) { |
| 546 | break; |
| 547 | } |
| 548 | error = ubc_uiomove(uobj, uio, len, IO_ADV_DECODE(ioflag), |
| 549 | UBC_READ | UBC_PARTIALOK | UBC_UNMAP_FLAG(vp)); |
| 550 | } |
| 551 | |
| 552 | tmpfs_update(vp, TMPFS_UPDATE_ATIME); |
| 553 | return error; |
| 554 | } |
| 555 | |
| 556 | int |
| 557 | tmpfs_write(void *v) |
| 558 | { |
| 559 | struct vop_write_args /* { |
| 560 | struct vnode *a_vp; |
| 561 | struct uio *a_uio; |
| 562 | int a_ioflag; |
| 563 | kauth_cred_t a_cred; |
| 564 | } */ *ap = v; |
| 565 | vnode_t *vp = ap->a_vp; |
| 566 | struct uio *uio = ap->a_uio; |
| 567 | const int ioflag = ap->a_ioflag; |
| 568 | tmpfs_node_t *node; |
| 569 | struct uvm_object *uobj; |
| 570 | off_t oldsize; |
| 571 | int error; |
| 572 | |
| 573 | KASSERT(VOP_ISLOCKED(vp)); |
| 574 | |
| 575 | node = VP_TO_TMPFS_NODE(vp); |
| 576 | oldsize = node->tn_size; |
| 577 | |
| 578 | if ((vp->v_mount->mnt_flag & MNT_RDONLY) != 0) { |
| 579 | error = EROFS; |
| 580 | goto out; |
| 581 | } |
| 582 | |
| 583 | if (uio->uio_offset < 0 || vp->v_type != VREG) { |
| 584 | error = EINVAL; |
| 585 | goto out; |
| 586 | } |
| 587 | if (uio->uio_resid == 0) { |
| 588 | error = 0; |
| 589 | goto out; |
| 590 | } |
| 591 | if (ioflag & IO_APPEND) { |
| 592 | uio->uio_offset = node->tn_size; |
| 593 | } |
| 594 | |
| 595 | if (uio->uio_offset + uio->uio_resid > node->tn_size) { |
| 596 | error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); |
| 597 | if (error) |
| 598 | goto out; |
| 599 | } |
| 600 | |
| 601 | uobj = node->tn_spec.tn_reg.tn_aobj; |
| 602 | error = 0; |
| 603 | while (error == 0 && uio->uio_resid > 0) { |
| 604 | vsize_t len; |
| 605 | |
| 606 | len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); |
| 607 | if (len == 0) { |
| 608 | break; |
| 609 | } |
| 610 | error = ubc_uiomove(uobj, uio, len, IO_ADV_DECODE(ioflag), |
| 611 | UBC_WRITE | UBC_UNMAP_FLAG(vp)); |
| 612 | } |
| 613 | if (error) { |
| 614 | (void)tmpfs_reg_resize(vp, oldsize); |
| 615 | } |
| 616 | |
| 617 | tmpfs_update(vp, TMPFS_UPDATE_MTIME | TMPFS_UPDATE_CTIME); |
| 618 | VN_KNOTE(vp, NOTE_WRITE); |
| 619 | out: |
| 620 | if (error) { |
| 621 | KASSERT(oldsize == node->tn_size); |
| 622 | } else { |
| 623 | KASSERT(uio->uio_resid == 0); |
| 624 | } |
| 625 | return error; |
| 626 | } |
| 627 | |
| 628 | int |
| 629 | tmpfs_fsync(void *v) |
| 630 | { |
| 631 | struct vop_fsync_args /* { |
| 632 | struct vnode *a_vp; |
| 633 | kauth_cred_t a_cred; |
| 634 | int a_flags; |
| 635 | off_t a_offlo; |
| 636 | off_t a_offhi; |
| 637 | struct lwp *a_l; |
| 638 | } */ *ap = v; |
| 639 | vnode_t *vp __diagused = ap->a_vp; |
| 640 | |
| 641 | /* Nothing to do. Should be up to date. */ |
| 642 | KASSERT(VOP_ISLOCKED(vp)); |
| 643 | return 0; |
| 644 | } |
| 645 | |
| 646 | /* |
| 647 | * tmpfs_remove: unlink a file. |
| 648 | * |
| 649 | * => Both directory (dvp) and file (vp) are locked. |
| 650 | * => We unlock and drop the reference on both. |
| 651 | */ |
| 652 | int |
| 653 | tmpfs_remove(void *v) |
| 654 | { |
| 655 | struct vop_remove_args /* { |
| 656 | struct vnode *a_dvp; |
| 657 | struct vnode *a_vp; |
| 658 | struct componentname *a_cnp; |
| 659 | } */ *ap = v; |
| 660 | vnode_t *dvp = ap->a_dvp, *vp = ap->a_vp; |
| 661 | tmpfs_node_t *dnode, *node; |
| 662 | tmpfs_dirent_t *de; |
| 663 | int error; |
| 664 | |
| 665 | KASSERT(VOP_ISLOCKED(dvp)); |
| 666 | KASSERT(VOP_ISLOCKED(vp)); |
| 667 | |
| 668 | if (vp->v_type == VDIR) { |
| 669 | error = EPERM; |
| 670 | goto out; |
| 671 | } |
| 672 | dnode = VP_TO_TMPFS_DIR(dvp); |
| 673 | node = VP_TO_TMPFS_NODE(vp); |
| 674 | |
| 675 | /* |
| 676 | * Files marked as immutable or append-only cannot be deleted. |
| 677 | * Likewise, files residing on directories marked as append-only |
| 678 | * cannot be deleted. |
| 679 | */ |
| 680 | if (node->tn_flags & (IMMUTABLE | APPEND)) { |
| 681 | error = EPERM; |
| 682 | goto out; |
| 683 | } |
| 684 | if (dnode->tn_flags & APPEND) { |
| 685 | error = EPERM; |
| 686 | goto out; |
| 687 | } |
| 688 | |
| 689 | /* Lookup the directory entry (check the cached hint first). */ |
| 690 | de = tmpfs_dir_cached(node); |
| 691 | if (de == NULL) { |
| 692 | struct componentname *cnp = ap->a_cnp; |
| 693 | de = tmpfs_dir_lookup(dnode, cnp); |
| 694 | } |
| 695 | KASSERT(de && de->td_node == node); |
| 696 | |
| 697 | /* |
| 698 | * Remove the entry from the directory (drops the link count) and |
| 699 | * destroy it or replace with a whiteout. |
| 700 | * |
| 701 | * Note: the inode referred by it will not be destroyed until the |
| 702 | * vnode is reclaimed/recycled. |
| 703 | */ |
| 704 | |
| 705 | tmpfs_dir_detach(dnode, de); |
| 706 | |
| 707 | if (ap->a_cnp->cn_flags & DOWHITEOUT) |
| 708 | tmpfs_dir_attach(dnode, de, TMPFS_NODE_WHITEOUT); |
| 709 | else |
| 710 | tmpfs_free_dirent(VFS_TO_TMPFS(vp->v_mount), de); |
| 711 | |
| 712 | if (node->tn_links > 0) { |
| 713 | /* We removed a hard link. */ |
| 714 | tmpfs_update(vp, TMPFS_UPDATE_CTIME); |
| 715 | } |
| 716 | tmpfs_update(dvp, TMPFS_UPDATE_MTIME | TMPFS_UPDATE_CTIME); |
| 717 | error = 0; |
| 718 | out: |
| 719 | /* Drop the references and unlock the vnodes. */ |
| 720 | vput(vp); |
| 721 | if (dvp == vp) { |
| 722 | vrele(dvp); |
| 723 | } else { |
| 724 | vput(dvp); |
| 725 | } |
| 726 | return error; |
| 727 | } |
| 728 | |
| 729 | /* |
| 730 | * tmpfs_link: create a hard link. |
| 731 | */ |
| 732 | int |
| 733 | tmpfs_link(void *v) |
| 734 | { |
| 735 | struct vop_link_v2_args /* { |
| 736 | struct vnode *a_dvp; |
| 737 | struct vnode *a_vp; |
| 738 | struct componentname *a_cnp; |
| 739 | } */ *ap = v; |
| 740 | vnode_t *dvp = ap->a_dvp; |
| 741 | vnode_t *vp = ap->a_vp; |
| 742 | struct componentname *cnp = ap->a_cnp; |
| 743 | tmpfs_node_t *dnode, *node; |
| 744 | tmpfs_dirent_t *de; |
| 745 | int error; |
| 746 | |
| 747 | KASSERT(dvp != vp); |
| 748 | KASSERT(VOP_ISLOCKED(dvp)); |
| 749 | KASSERT(vp->v_type != VDIR); |
| 750 | KASSERT(dvp->v_mount == vp->v_mount); |
| 751 | |
| 752 | dnode = VP_TO_TMPFS_DIR(dvp); |
| 753 | node = VP_TO_TMPFS_NODE(vp); |
| 754 | |
| 755 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
| 756 | |
| 757 | /* Check for maximum number of links limit. */ |
| 758 | if (node->tn_links == LINK_MAX) { |
| 759 | error = EMLINK; |
| 760 | goto out; |
| 761 | } |
| 762 | KASSERT(node->tn_links < LINK_MAX); |
| 763 | |
| 764 | /* We cannot create links of files marked immutable or append-only. */ |
| 765 | if (node->tn_flags & (IMMUTABLE | APPEND)) { |
| 766 | error = EPERM; |
| 767 | goto out; |
| 768 | } |
| 769 | |
| 770 | /* Allocate a new directory entry to represent the inode. */ |
| 771 | error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), |
| 772 | cnp->cn_nameptr, cnp->cn_namelen, &de); |
| 773 | if (error) { |
| 774 | goto out; |
| 775 | } |
| 776 | |
| 777 | /* |
| 778 | * Insert the entry into the directory. |
| 779 | * It will increase the inode link count. |
| 780 | */ |
| 781 | tmpfs_dir_attach(dnode, de, node); |
| 782 | tmpfs_update(dvp, TMPFS_UPDATE_MTIME | TMPFS_UPDATE_CTIME); |
| 783 | |
| 784 | /* Update the timestamps and trigger the event. */ |
| 785 | if (node->tn_vnode) { |
| 786 | VN_KNOTE(node->tn_vnode, NOTE_LINK); |
| 787 | } |
| 788 | tmpfs_update(vp, TMPFS_UPDATE_CTIME); |
| 789 | error = 0; |
| 790 | out: |
| 791 | VOP_UNLOCK(vp); |
| 792 | return error; |
| 793 | } |
| 794 | |
| 795 | int |
| 796 | tmpfs_mkdir(void *v) |
| 797 | { |
| 798 | struct vop_mkdir_v3_args /* { |
| 799 | struct vnode *a_dvp; |
| 800 | struct vnode **a_vpp; |
| 801 | struct componentname *a_cnp; |
| 802 | struct vattr *a_vap; |
| 803 | } */ *ap = v; |
| 804 | vnode_t *dvp = ap->a_dvp; |
| 805 | vnode_t **vpp = ap->a_vpp; |
| 806 | struct componentname *cnp = ap->a_cnp; |
| 807 | struct vattr *vap = ap->a_vap; |
| 808 | |
| 809 | KASSERT(vap->va_type == VDIR); |
| 810 | return tmpfs_construct_node(dvp, vpp, vap, cnp, NULL); |
| 811 | } |
| 812 | |
| 813 | int |
| 814 | tmpfs_rmdir(void *v) |
| 815 | { |
| 816 | struct vop_rmdir_args /* { |
| 817 | struct vnode *a_dvp; |
| 818 | struct vnode *a_vp; |
| 819 | struct componentname *a_cnp; |
| 820 | } */ *ap = v; |
| 821 | vnode_t *dvp = ap->a_dvp; |
| 822 | vnode_t *vp = ap->a_vp; |
| 823 | tmpfs_mount_t *tmp = VFS_TO_TMPFS(dvp->v_mount); |
| 824 | tmpfs_node_t *dnode = VP_TO_TMPFS_DIR(dvp); |
| 825 | tmpfs_node_t *node = VP_TO_TMPFS_DIR(vp); |
| 826 | tmpfs_dirent_t *de; |
| 827 | int error = 0; |
| 828 | |
| 829 | KASSERT(VOP_ISLOCKED(dvp)); |
| 830 | KASSERT(VOP_ISLOCKED(vp)); |
| 831 | |
| 832 | /* |
| 833 | * Directories with more than two entries ('.' and '..') cannot be |
| 834 | * removed. There may be whiteout entries, which we will destroy. |
| 835 | */ |
| 836 | if (node->tn_size > 0) { |
| 837 | /* |
| 838 | * If never had whiteout entries, the directory is certainly |
| 839 | * not empty. Otherwise, scan for any non-whiteout entry. |
| 840 | */ |
| 841 | if ((node->tn_gen & TMPFS_WHITEOUT_BIT) == 0) { |
| 842 | error = ENOTEMPTY; |
| 843 | goto out; |
| 844 | } |
| 845 | TAILQ_FOREACH(de, &node->tn_spec.tn_dir.tn_dir, td_entries) { |
| 846 | if (de->td_node != TMPFS_NODE_WHITEOUT) { |
| 847 | error = ENOTEMPTY; |
| 848 | goto out; |
| 849 | } |
| 850 | } |
| 851 | KASSERT(error == 0); |
| 852 | } |
| 853 | |
| 854 | KASSERT(node->tn_spec.tn_dir.tn_parent == dnode); |
| 855 | |
| 856 | /* Lookup the directory entry (check the cached hint first). */ |
| 857 | de = tmpfs_dir_cached(node); |
| 858 | if (de == NULL) { |
| 859 | struct componentname *cnp = ap->a_cnp; |
| 860 | de = tmpfs_dir_lookup(dnode, cnp); |
| 861 | } |
| 862 | KASSERT(de && de->td_node == node); |
| 863 | |
| 864 | /* Check flags to see if we are allowed to remove the directory. */ |
| 865 | if (dnode->tn_flags & APPEND || node->tn_flags & (IMMUTABLE | APPEND)) { |
| 866 | error = EPERM; |
| 867 | goto out; |
| 868 | } |
| 869 | |
| 870 | /* Decrement the link count for the virtual '.' entry. */ |
| 871 | node->tn_links--; |
| 872 | |
| 873 | /* Detach the directory entry from the directory. */ |
| 874 | tmpfs_dir_detach(dnode, de); |
| 875 | |
| 876 | /* Purge the cache for parent. */ |
| 877 | cache_purge(dvp); |
| 878 | |
| 879 | /* |
| 880 | * Destroy the directory entry or replace it with a whiteout. |
| 881 | * |
| 882 | * Note: the inode referred by it will not be destroyed until the |
| 883 | * vnode is reclaimed. |
| 884 | */ |
| 885 | if (ap->a_cnp->cn_flags & DOWHITEOUT) |
| 886 | tmpfs_dir_attach(dnode, de, TMPFS_NODE_WHITEOUT); |
| 887 | else |
| 888 | tmpfs_free_dirent(tmp, de); |
| 889 | |
| 890 | /* Destroy the whiteout entries from the node. */ |
| 891 | while ((de = TAILQ_FIRST(&node->tn_spec.tn_dir.tn_dir)) != NULL) { |
| 892 | KASSERT(de->td_node == TMPFS_NODE_WHITEOUT); |
| 893 | tmpfs_dir_detach(node, de); |
| 894 | tmpfs_free_dirent(tmp, de); |
| 895 | } |
| 896 | tmpfs_update(dvp, TMPFS_UPDATE_MTIME | TMPFS_UPDATE_CTIME); |
| 897 | |
| 898 | KASSERT(node->tn_size == 0); |
| 899 | KASSERT(node->tn_links == 0); |
| 900 | out: |
| 901 | /* Release the nodes. */ |
| 902 | vput(dvp); |
| 903 | vput(vp); |
| 904 | return error; |
| 905 | } |
| 906 | |
| 907 | int |
| 908 | tmpfs_symlink(void *v) |
| 909 | { |
| 910 | struct vop_symlink_v3_args /* { |
| 911 | struct vnode *a_dvp; |
| 912 | struct vnode **a_vpp; |
| 913 | struct componentname *a_cnp; |
| 914 | struct vattr *a_vap; |
| 915 | char *a_target; |
| 916 | } */ *ap = v; |
| 917 | vnode_t *dvp = ap->a_dvp; |
| 918 | vnode_t **vpp = ap->a_vpp; |
| 919 | struct componentname *cnp = ap->a_cnp; |
| 920 | struct vattr *vap = ap->a_vap; |
| 921 | char *target = ap->a_target; |
| 922 | |
| 923 | KASSERT(vap->va_type == VLNK); |
| 924 | return tmpfs_construct_node(dvp, vpp, vap, cnp, target); |
| 925 | } |
| 926 | |
| 927 | int |
| 928 | tmpfs_readdir(void *v) |
| 929 | { |
| 930 | struct vop_readdir_args /* { |
| 931 | struct vnode *a_vp; |
| 932 | struct uio *a_uio; |
| 933 | kauth_cred_t a_cred; |
| 934 | int *a_eofflag; |
| 935 | off_t **a_cookies; |
| 936 | int *ncookies; |
| 937 | } */ *ap = v; |
| 938 | vnode_t *vp = ap->a_vp; |
| 939 | struct uio *uio = ap->a_uio; |
| 940 | int *eofflag = ap->a_eofflag; |
| 941 | off_t **cookies = ap->a_cookies; |
| 942 | int *ncookies = ap->a_ncookies; |
| 943 | off_t startoff, cnt; |
| 944 | tmpfs_node_t *node; |
| 945 | int error; |
| 946 | |
| 947 | KASSERT(VOP_ISLOCKED(vp)); |
| 948 | |
| 949 | /* This operation only makes sense on directory nodes. */ |
| 950 | if (vp->v_type != VDIR) { |
| 951 | return ENOTDIR; |
| 952 | } |
| 953 | node = VP_TO_TMPFS_DIR(vp); |
| 954 | startoff = uio->uio_offset; |
| 955 | cnt = 0; |
| 956 | |
| 957 | /* |
| 958 | * Retrieve the directory entries, unless it is being destroyed. |
| 959 | */ |
| 960 | if (node->tn_links) { |
| 961 | error = tmpfs_dir_getdents(node, uio, &cnt); |
| 962 | } else { |
| 963 | error = 0; |
| 964 | } |
| 965 | |
| 966 | if (eofflag != NULL) { |
| 967 | *eofflag = !error && uio->uio_offset == TMPFS_DIRSEQ_EOF; |
| 968 | } |
| 969 | if (error || cookies == NULL || ncookies == NULL) { |
| 970 | return error; |
| 971 | } |
| 972 | |
| 973 | /* Update NFS-related variables, if any. */ |
| 974 | tmpfs_dirent_t *de = NULL; |
| 975 | off_t i, off = startoff; |
| 976 | |
| 977 | *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); |
| 978 | *ncookies = cnt; |
| 979 | |
| 980 | for (i = 0; i < cnt; i++) { |
| 981 | KASSERT(off != TMPFS_DIRSEQ_EOF); |
| 982 | if (off != TMPFS_DIRSEQ_DOT) { |
| 983 | if (off == TMPFS_DIRSEQ_DOTDOT) { |
| 984 | de = TAILQ_FIRST(&node->tn_spec.tn_dir.tn_dir); |
| 985 | } else if (de != NULL) { |
| 986 | de = TAILQ_NEXT(de, td_entries); |
| 987 | } else { |
| 988 | de = tmpfs_dir_lookupbyseq(node, off); |
| 989 | KASSERT(de != NULL); |
| 990 | de = TAILQ_NEXT(de, td_entries); |
| 991 | } |
| 992 | if (de == NULL) { |
| 993 | off = TMPFS_DIRSEQ_EOF; |
| 994 | } else { |
| 995 | off = tmpfs_dir_getseq(node, de); |
| 996 | } |
| 997 | } else { |
| 998 | off = TMPFS_DIRSEQ_DOTDOT; |
| 999 | } |
| 1000 | (*cookies)[i] = off; |
| 1001 | } |
| 1002 | KASSERT(uio->uio_offset == off); |
| 1003 | return error; |
| 1004 | } |
| 1005 | |
| 1006 | int |
| 1007 | tmpfs_readlink(void *v) |
| 1008 | { |
| 1009 | struct vop_readlink_args /* { |
| 1010 | struct vnode *a_vp; |
| 1011 | struct uio *a_uio; |
| 1012 | kauth_cred_t a_cred; |
| 1013 | } */ *ap = v; |
| 1014 | vnode_t *vp = ap->a_vp; |
| 1015 | struct uio *uio = ap->a_uio; |
| 1016 | tmpfs_node_t *node = VP_TO_TMPFS_NODE(vp); |
| 1017 | int error; |
| 1018 | |
| 1019 | KASSERT(VOP_ISLOCKED(vp)); |
| 1020 | KASSERT(uio->uio_offset == 0); |
| 1021 | KASSERT(vp->v_type == VLNK); |
| 1022 | |
| 1023 | /* Note: readlink(2) returns the path without NUL terminator. */ |
| 1024 | if (node->tn_size > 0) { |
| 1025 | error = uiomove(node->tn_spec.tn_lnk.tn_link, |
| 1026 | MIN(node->tn_size, uio->uio_resid), uio); |
| 1027 | } else { |
| 1028 | error = 0; |
| 1029 | } |
| 1030 | tmpfs_update(vp, TMPFS_UPDATE_ATIME); |
| 1031 | |
| 1032 | return error; |
| 1033 | } |
| 1034 | |
| 1035 | int |
| 1036 | tmpfs_inactive(void *v) |
| 1037 | { |
| 1038 | struct vop_inactive_args /* { |
| 1039 | struct vnode *a_vp; |
| 1040 | bool *a_recycle; |
| 1041 | } */ *ap = v; |
| 1042 | vnode_t *vp = ap->a_vp; |
| 1043 | tmpfs_node_t *node; |
| 1044 | |
| 1045 | KASSERT(VOP_ISLOCKED(vp)); |
| 1046 | |
| 1047 | node = VP_TO_TMPFS_NODE(vp); |
| 1048 | if (node->tn_links == 0) { |
| 1049 | /* |
| 1050 | * Mark node as dead by setting its generation to zero. |
| 1051 | */ |
| 1052 | atomic_and_32(&node->tn_gen, ~TMPFS_NODE_GEN_MASK); |
| 1053 | *ap->a_recycle = true; |
| 1054 | } else { |
| 1055 | *ap->a_recycle = false; |
| 1056 | } |
| 1057 | VOP_UNLOCK(vp); |
| 1058 | |
| 1059 | return 0; |
| 1060 | } |
| 1061 | |
| 1062 | int |
| 1063 | tmpfs_reclaim(void *v) |
| 1064 | { |
| 1065 | struct vop_reclaim_args /* { |
| 1066 | struct vnode *a_vp; |
| 1067 | } */ *ap = v; |
| 1068 | vnode_t *vp = ap->a_vp; |
| 1069 | tmpfs_mount_t *tmp = VFS_TO_TMPFS(vp->v_mount); |
| 1070 | tmpfs_node_t *node = VP_TO_TMPFS_NODE(vp); |
| 1071 | |
| 1072 | /* Disassociate inode from vnode. */ |
| 1073 | node->tn_vnode = NULL; |
| 1074 | vp->v_data = NULL; |
| 1075 | |
| 1076 | /* If inode is not referenced, i.e. no links, then destroy it. */ |
| 1077 | if (node->tn_links == 0) |
| 1078 | tmpfs_free_node(tmp, node); |
| 1079 | return 0; |
| 1080 | } |
| 1081 | |
| 1082 | int |
| 1083 | tmpfs_pathconf(void *v) |
| 1084 | { |
| 1085 | struct vop_pathconf_args /* { |
| 1086 | struct vnode *a_vp; |
| 1087 | int a_name; |
| 1088 | register_t *a_retval; |
| 1089 | } */ *ap = v; |
| 1090 | const int name = ap->a_name; |
| 1091 | register_t *retval = ap->a_retval; |
| 1092 | int error = 0; |
| 1093 | |
| 1094 | switch (name) { |
| 1095 | case _PC_LINK_MAX: |
| 1096 | *retval = LINK_MAX; |
| 1097 | break; |
| 1098 | case _PC_NAME_MAX: |
| 1099 | *retval = TMPFS_MAXNAMLEN; |
| 1100 | break; |
| 1101 | case _PC_PATH_MAX: |
| 1102 | *retval = PATH_MAX; |
| 1103 | break; |
| 1104 | case _PC_PIPE_BUF: |
| 1105 | *retval = PIPE_BUF; |
| 1106 | break; |
| 1107 | case _PC_CHOWN_RESTRICTED: |
| 1108 | *retval = 1; |
| 1109 | break; |
| 1110 | case _PC_NO_TRUNC: |
| 1111 | *retval = 1; |
| 1112 | break; |
| 1113 | case _PC_SYNC_IO: |
| 1114 | *retval = 1; |
| 1115 | break; |
| 1116 | case _PC_FILESIZEBITS: |
| 1117 | *retval = sizeof(off_t) * CHAR_BIT; |
| 1118 | break; |
| 1119 | default: |
| 1120 | error = EINVAL; |
| 1121 | } |
| 1122 | return error; |
| 1123 | } |
| 1124 | |
| 1125 | int |
| 1126 | tmpfs_advlock(void *v) |
| 1127 | { |
| 1128 | struct vop_advlock_args /* { |
| 1129 | struct vnode *a_vp; |
| 1130 | void * a_id; |
| 1131 | int a_op; |
| 1132 | struct flock *a_fl; |
| 1133 | int a_flags; |
| 1134 | } */ *ap = v; |
| 1135 | vnode_t *vp = ap->a_vp; |
| 1136 | tmpfs_node_t *node = VP_TO_TMPFS_NODE(vp); |
| 1137 | |
| 1138 | return lf_advlock(v, &node->tn_lockf, node->tn_size); |
| 1139 | } |
| 1140 | |
| 1141 | int |
| 1142 | tmpfs_getpages(void *v) |
| 1143 | { |
| 1144 | struct vop_getpages_args /* { |
| 1145 | struct vnode *a_vp; |
| 1146 | voff_t a_offset; |
| 1147 | struct vm_page **a_m; |
| 1148 | int *a_count; |
| 1149 | int a_centeridx; |
| 1150 | vm_prot_t a_access_type; |
| 1151 | int a_advice; |
| 1152 | int a_flags; |
| 1153 | } */ * const ap = v; |
| 1154 | vnode_t *vp = ap->a_vp; |
| 1155 | const voff_t offset = ap->a_offset; |
| 1156 | struct vm_page **pgs = ap->a_m; |
| 1157 | const int centeridx = ap->a_centeridx; |
| 1158 | const vm_prot_t access_type = ap->a_access_type; |
| 1159 | const int advice = ap->a_advice; |
| 1160 | const int flags = ap->a_flags; |
| 1161 | int error, npages = *ap->a_count; |
| 1162 | tmpfs_node_t *node; |
| 1163 | struct uvm_object *uobj; |
| 1164 | |
| 1165 | KASSERT(vp->v_type == VREG); |
| 1166 | KASSERT(mutex_owned(vp->v_interlock)); |
| 1167 | |
| 1168 | node = VP_TO_TMPFS_NODE(vp); |
| 1169 | uobj = node->tn_spec.tn_reg.tn_aobj; |
| 1170 | |
| 1171 | /* |
| 1172 | * Currently, PGO_PASTEOF is not supported. |
| 1173 | */ |
| 1174 | if (vp->v_size <= offset + (centeridx << PAGE_SHIFT)) { |
| 1175 | if ((flags & PGO_LOCKED) == 0) |
| 1176 | mutex_exit(vp->v_interlock); |
| 1177 | return EINVAL; |
| 1178 | } |
| 1179 | |
| 1180 | if (vp->v_size < offset + (npages << PAGE_SHIFT)) { |
| 1181 | npages = (round_page(vp->v_size) - offset) >> PAGE_SHIFT; |
| 1182 | } |
| 1183 | |
| 1184 | if ((flags & PGO_LOCKED) != 0) |
| 1185 | return EBUSY; |
| 1186 | |
| 1187 | if ((flags & PGO_NOTIMESTAMP) == 0) { |
| 1188 | u_int tflags = 0; |
| 1189 | |
| 1190 | if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0) |
| 1191 | tflags |= TMPFS_UPDATE_ATIME; |
| 1192 | |
| 1193 | if ((access_type & VM_PROT_WRITE) != 0) { |
| 1194 | tflags |= TMPFS_UPDATE_MTIME; |
| 1195 | if (vp->v_mount->mnt_flag & MNT_RELATIME) |
| 1196 | tflags |= TMPFS_UPDATE_ATIME; |
| 1197 | } |
| 1198 | tmpfs_update(vp, tflags); |
| 1199 | } |
| 1200 | |
| 1201 | /* |
| 1202 | * Invoke the pager. |
| 1203 | * |
| 1204 | * Clean the array of pages before. XXX: PR/32166 |
| 1205 | * Note that vnode lock is shared with underlying UVM object. |
| 1206 | */ |
| 1207 | if (pgs) { |
| 1208 | memset(pgs, 0, sizeof(struct vm_pages *) * npages); |
| 1209 | } |
| 1210 | KASSERT(vp->v_interlock == uobj->vmobjlock); |
| 1211 | |
| 1212 | error = (*uobj->pgops->pgo_get)(uobj, offset, pgs, &npages, centeridx, |
| 1213 | access_type, advice, flags | PGO_ALLPAGES); |
| 1214 | |
| 1215 | #if defined(DEBUG) |
| 1216 | if (!error && pgs) { |
| 1217 | for (int i = 0; i < npages; i++) { |
| 1218 | KASSERT(pgs[i] != NULL); |
| 1219 | } |
| 1220 | } |
| 1221 | #endif |
| 1222 | return error; |
| 1223 | } |
| 1224 | |
| 1225 | int |
| 1226 | tmpfs_putpages(void *v) |
| 1227 | { |
| 1228 | struct vop_putpages_args /* { |
| 1229 | struct vnode *a_vp; |
| 1230 | voff_t a_offlo; |
| 1231 | voff_t a_offhi; |
| 1232 | int a_flags; |
| 1233 | } */ * const ap = v; |
| 1234 | vnode_t *vp = ap->a_vp; |
| 1235 | const voff_t offlo = ap->a_offlo; |
| 1236 | const voff_t offhi = ap->a_offhi; |
| 1237 | const int flags = ap->a_flags; |
| 1238 | tmpfs_node_t *node; |
| 1239 | struct uvm_object *uobj; |
| 1240 | int error; |
| 1241 | |
| 1242 | KASSERT(mutex_owned(vp->v_interlock)); |
| 1243 | |
| 1244 | if (vp->v_type != VREG) { |
| 1245 | mutex_exit(vp->v_interlock); |
| 1246 | return 0; |
| 1247 | } |
| 1248 | |
| 1249 | node = VP_TO_TMPFS_NODE(vp); |
| 1250 | uobj = node->tn_spec.tn_reg.tn_aobj; |
| 1251 | |
| 1252 | KASSERT(vp->v_interlock == uobj->vmobjlock); |
| 1253 | error = (*uobj->pgops->pgo_put)(uobj, offlo, offhi, flags); |
| 1254 | |
| 1255 | /* XXX mtime */ |
| 1256 | |
| 1257 | return error; |
| 1258 | } |
| 1259 | |
| 1260 | int |
| 1261 | tmpfs_whiteout(void *v) |
| 1262 | { |
| 1263 | struct vop_whiteout_args /* { |
| 1264 | struct vnode *a_dvp; |
| 1265 | struct componentname *a_cnp; |
| 1266 | int a_flags; |
| 1267 | } */ *ap = v; |
| 1268 | vnode_t *dvp = ap->a_dvp; |
| 1269 | struct componentname *cnp = ap->a_cnp; |
| 1270 | const int flags = ap->a_flags; |
| 1271 | tmpfs_mount_t *tmp = VFS_TO_TMPFS(dvp->v_mount); |
| 1272 | tmpfs_node_t *dnode = VP_TO_TMPFS_DIR(dvp); |
| 1273 | tmpfs_dirent_t *de; |
| 1274 | int error; |
| 1275 | |
| 1276 | switch (flags) { |
| 1277 | case LOOKUP: |
| 1278 | break; |
| 1279 | case CREATE: |
| 1280 | error = tmpfs_alloc_dirent(tmp, cnp->cn_nameptr, |
| 1281 | cnp->cn_namelen, &de); |
| 1282 | if (error) |
| 1283 | return error; |
| 1284 | tmpfs_dir_attach(dnode, de, TMPFS_NODE_WHITEOUT); |
| 1285 | break; |
| 1286 | case DELETE: |
| 1287 | cnp->cn_flags &= ~DOWHITEOUT; /* when in doubt, cargo cult */ |
| 1288 | de = tmpfs_dir_lookup(dnode, cnp); |
| 1289 | if (de == NULL) |
| 1290 | return ENOENT; |
| 1291 | tmpfs_dir_detach(dnode, de); |
| 1292 | tmpfs_free_dirent(tmp, de); |
| 1293 | break; |
| 1294 | } |
| 1295 | tmpfs_update(dvp, TMPFS_UPDATE_MTIME | TMPFS_UPDATE_CTIME); |
| 1296 | return 0; |
| 1297 | } |
| 1298 | |
| 1299 | int |
| 1300 | tmpfs_print(void *v) |
| 1301 | { |
| 1302 | struct vop_print_args /* { |
| 1303 | struct vnode *a_vp; |
| 1304 | } */ *ap = v; |
| 1305 | vnode_t *vp = ap->a_vp; |
| 1306 | tmpfs_node_t *node = VP_TO_TMPFS_NODE(vp); |
| 1307 | |
| 1308 | printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n" |
| 1309 | "\tmode 0%o, owner %d, group %d, size %" PRIdMAX, |
| 1310 | node, node->tn_flags, node->tn_links, node->tn_mode, node->tn_uid, |
| 1311 | node->tn_gid, (uintmax_t)node->tn_size); |
| 1312 | if (vp->v_type == VFIFO) { |
| 1313 | VOCALL(fifo_vnodeop_p, VOFFSET(vop_print), v); |
| 1314 | } |
| 1315 | printf("\n" ); |
| 1316 | return 0; |
| 1317 | } |
| 1318 | |