| 1 | /*- |
| 2 | * Copyright (c) 2005, 2006 The NetBSD Foundation, Inc. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * This code is derived from software contributed to The NetBSD Foundation |
| 6 | * by Julio M. Merino Vidal, developed as part of Google's Summer of Code |
| 7 | * 2005 program. |
| 8 | * |
| 9 | * Redistribution and use in source and binary forms, with or without |
| 10 | * modification, are permitted provided that the following conditions |
| 11 | * are met: |
| 12 | * 1. Redistributions of source code must retain the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer. |
| 14 | * 2. Redistributions in binary form must reproduce the above copyright |
| 15 | * notice, this list of conditions and the following disclaimer in the |
| 16 | * documentation and/or other materials provided with the distribution. |
| 17 | * |
| 18 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 19 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 20 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 21 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 22 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 23 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 24 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 25 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 26 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 27 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 28 | * POSSIBILITY OF SUCH DAMAGE. |
| 29 | * |
| 30 | * $NetBSD: tmpfs_vnops.c,v 1.39 2007/07/23 15:41:01 jmmv Exp $ |
| 31 | */ |
| 32 | |
| 33 | /* |
| 34 | * tmpfs vnode interface. |
| 35 | */ |
| 36 | |
| 37 | #include <sys/kernel.h> |
| 38 | #include <sys/kern_syscall.h> |
| 39 | #include <sys/param.h> |
| 40 | #include <sys/fcntl.h> |
| 41 | #include <sys/lockf.h> |
| 42 | #include <sys/priv.h> |
| 43 | #include <sys/proc.h> |
| 44 | #include <sys/resourcevar.h> |
| 45 | #include <sys/sched.h> |
| 46 | #include <sys/stat.h> |
| 47 | #include <sys/systm.h> |
| 48 | #include <sys/unistd.h> |
| 49 | #include <sys/vfsops.h> |
| 50 | #include <sys/vnode.h> |
| 51 | #include <sys/mountctl.h> |
| 52 | |
| 53 | #include <vm/vm.h> |
| 54 | #include <vm/vm_extern.h> |
| 55 | #include <vm/vm_object.h> |
| 56 | #include <vm/vm_page.h> |
| 57 | #include <vm/vm_pageout.h> |
| 58 | #include <vm/vm_pager.h> |
| 59 | #include <vm/swap_pager.h> |
| 60 | |
| 61 | #include <sys/buf2.h> |
| 62 | #include <vm/vm_page2.h> |
| 63 | |
| 64 | #include <vfs/fifofs/fifo.h> |
| 65 | #include <vfs/tmpfs/tmpfs_vnops.h> |
| 66 | #include "tmpfs.h" |
| 67 | |
| 68 | static void tmpfs_strategy_done(struct bio *bio); |
| 69 | |
| 70 | static __inline |
| 71 | void |
| 72 | tmpfs_knote(struct vnode *vp, int flags) |
| 73 | { |
| 74 | if (flags) |
| 75 | KNOTE(&vp->v_pollinfo.vpi_kqinfo.ki_note, flags); |
| 76 | } |
| 77 | |
| 78 | |
| 79 | /* --------------------------------------------------------------------- */ |
| 80 | |
| 81 | static int |
| 82 | tmpfs_nresolve(struct vop_nresolve_args *v) |
| 83 | { |
| 84 | struct vnode *dvp = v->a_dvp; |
| 85 | struct vnode *vp = NULL; |
| 86 | struct namecache *ncp = v->a_nch->ncp; |
| 87 | struct tmpfs_node *tnode; |
| 88 | struct mount *mp; |
| 89 | struct tmpfs_dirent *de; |
| 90 | struct tmpfs_node *dnode; |
| 91 | int error; |
| 92 | |
| 93 | mp = dvp->v_mount; |
| 94 | |
| 95 | dnode = VP_TO_TMPFS_DIR(dvp); |
| 96 | |
| 97 | TMPFS_NODE_LOCK_SH(dnode); |
| 98 | de = tmpfs_dir_lookup(dnode, NULL, ncp); |
| 99 | if (de == NULL) { |
| 100 | error = ENOENT; |
| 101 | } else { |
| 102 | /* |
| 103 | * Allocate a vnode for the node we found. |
| 104 | */ |
| 105 | tnode = de->td_node; |
| 106 | error = tmpfs_alloc_vp(dvp->v_mount, tnode, |
| 107 | LK_EXCLUSIVE | LK_RETRY, &vp); |
| 108 | if (error) |
| 109 | goto out; |
| 110 | KKASSERT(vp); |
| 111 | } |
| 112 | |
| 113 | out: |
| 114 | TMPFS_NODE_UNLOCK(dnode); |
| 115 | |
| 116 | if ((dnode->tn_status & TMPFS_NODE_ACCESSED) == 0) { |
| 117 | TMPFS_NODE_LOCK(dnode); |
| 118 | dnode->tn_status |= TMPFS_NODE_ACCESSED; |
| 119 | TMPFS_NODE_UNLOCK(dnode); |
| 120 | } |
| 121 | |
| 122 | /* |
| 123 | * Store the result of this lookup in the cache. Avoid this if the |
| 124 | * request was for creation, as it does not improve timings on |
| 125 | * emprical tests. |
| 126 | */ |
| 127 | if (vp) { |
| 128 | vn_unlock(vp); |
| 129 | cache_setvp(v->a_nch, vp); |
| 130 | vrele(vp); |
| 131 | } else if (error == ENOENT) { |
| 132 | cache_setvp(v->a_nch, NULL); |
| 133 | } |
| 134 | return (error); |
| 135 | } |
| 136 | |
| 137 | static int |
| 138 | tmpfs_nlookupdotdot(struct vop_nlookupdotdot_args *v) |
| 139 | { |
| 140 | struct vnode *dvp = v->a_dvp; |
| 141 | struct vnode **vpp = v->a_vpp; |
| 142 | struct tmpfs_node *dnode = VP_TO_TMPFS_NODE(dvp); |
| 143 | struct ucred *cred = v->a_cred; |
| 144 | struct mount *mp; |
| 145 | int error; |
| 146 | |
| 147 | *vpp = NULL; |
| 148 | |
| 149 | mp = dvp->v_mount; |
| 150 | |
| 151 | /* Check accessibility of requested node as a first step. */ |
| 152 | error = VOP_ACCESS(dvp, VEXEC, cred); |
| 153 | if (error != 0) |
| 154 | return error; |
| 155 | |
| 156 | if (dnode->tn_dir.tn_parent != NULL) { |
| 157 | /* Allocate a new vnode on the matching entry. */ |
| 158 | error = tmpfs_alloc_vp(dvp->v_mount, dnode->tn_dir.tn_parent, |
| 159 | LK_EXCLUSIVE | LK_RETRY, vpp); |
| 160 | |
| 161 | if (*vpp) |
| 162 | vn_unlock(*vpp); |
| 163 | } |
| 164 | return (*vpp == NULL) ? ENOENT : 0; |
| 165 | } |
| 166 | |
| 167 | /* --------------------------------------------------------------------- */ |
| 168 | |
| 169 | static int |
| 170 | tmpfs_ncreate(struct vop_ncreate_args *v) |
| 171 | { |
| 172 | struct vnode *dvp = v->a_dvp; |
| 173 | struct vnode **vpp = v->a_vpp; |
| 174 | struct namecache *ncp = v->a_nch->ncp; |
| 175 | struct vattr *vap = v->a_vap; |
| 176 | struct ucred *cred = v->a_cred; |
| 177 | struct mount *mp; |
| 178 | int error; |
| 179 | |
| 180 | mp = dvp->v_mount; |
| 181 | |
| 182 | KKASSERT(vap->va_type == VREG || vap->va_type == VSOCK); |
| 183 | |
| 184 | error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL); |
| 185 | if (error == 0) { |
| 186 | cache_setunresolved(v->a_nch); |
| 187 | cache_setvp(v->a_nch, *vpp); |
| 188 | tmpfs_knote(dvp, NOTE_WRITE); |
| 189 | } |
| 190 | return (error); |
| 191 | } |
| 192 | /* --------------------------------------------------------------------- */ |
| 193 | |
| 194 | static int |
| 195 | tmpfs_nmknod(struct vop_nmknod_args *v) |
| 196 | { |
| 197 | struct vnode *dvp = v->a_dvp; |
| 198 | struct vnode **vpp = v->a_vpp; |
| 199 | struct namecache *ncp = v->a_nch->ncp; |
| 200 | struct vattr *vap = v->a_vap; |
| 201 | struct ucred *cred = v->a_cred; |
| 202 | int error; |
| 203 | |
| 204 | if (vap->va_type != VBLK && vap->va_type != VCHR && |
| 205 | vap->va_type != VFIFO) { |
| 206 | return (EINVAL); |
| 207 | } |
| 208 | |
| 209 | error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL); |
| 210 | if (error == 0) { |
| 211 | cache_setunresolved(v->a_nch); |
| 212 | cache_setvp(v->a_nch, *vpp); |
| 213 | tmpfs_knote(dvp, NOTE_WRITE); |
| 214 | } |
| 215 | return error; |
| 216 | } |
| 217 | |
| 218 | /* --------------------------------------------------------------------- */ |
| 219 | |
| 220 | static int |
| 221 | tmpfs_open(struct vop_open_args *v) |
| 222 | { |
| 223 | struct vnode *vp = v->a_vp; |
| 224 | int mode = v->a_mode; |
| 225 | struct tmpfs_node *node; |
| 226 | int error; |
| 227 | |
| 228 | node = VP_TO_TMPFS_NODE(vp); |
| 229 | |
| 230 | #if 0 |
| 231 | /* The file is still active but all its names have been removed |
| 232 | * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as |
| 233 | * it is about to die. */ |
| 234 | if (node->tn_links < 1) |
| 235 | return (ENOENT); |
| 236 | #endif |
| 237 | |
| 238 | /* If the file is marked append-only, deny write requests. */ |
| 239 | if ((node->tn_flags & APPEND) && |
| 240 | (mode & (FWRITE | O_APPEND)) == FWRITE) { |
| 241 | error = EPERM; |
| 242 | } else { |
| 243 | error = (vop_stdopen(v)); |
| 244 | } |
| 245 | |
| 246 | return (error); |
| 247 | } |
| 248 | |
| 249 | /* --------------------------------------------------------------------- */ |
| 250 | |
| 251 | static int |
| 252 | tmpfs_close(struct vop_close_args *v) |
| 253 | { |
| 254 | struct vnode *vp = v->a_vp; |
| 255 | struct tmpfs_node *node; |
| 256 | int error; |
| 257 | |
| 258 | node = VP_TO_TMPFS_NODE(vp); |
| 259 | |
| 260 | if (node->tn_links > 0) { |
| 261 | /* |
| 262 | * Update node times. No need to do it if the node has |
| 263 | * been deleted, because it will vanish after we return. |
| 264 | */ |
| 265 | tmpfs_update(vp); |
| 266 | } |
| 267 | |
| 268 | error = vop_stdclose(v); |
| 269 | |
| 270 | return (error); |
| 271 | } |
| 272 | |
| 273 | /* --------------------------------------------------------------------- */ |
| 274 | |
| 275 | int |
| 276 | tmpfs_access(struct vop_access_args *v) |
| 277 | { |
| 278 | struct vnode *vp = v->a_vp; |
| 279 | int error; |
| 280 | struct tmpfs_node *node; |
| 281 | |
| 282 | node = VP_TO_TMPFS_NODE(vp); |
| 283 | |
| 284 | switch (vp->v_type) { |
| 285 | case VDIR: |
| 286 | /* FALLTHROUGH */ |
| 287 | case VLNK: |
| 288 | /* FALLTHROUGH */ |
| 289 | case VREG: |
| 290 | if ((v->a_mode & VWRITE) && |
| 291 | (vp->v_mount->mnt_flag & MNT_RDONLY)) { |
| 292 | error = EROFS; |
| 293 | goto out; |
| 294 | } |
| 295 | break; |
| 296 | |
| 297 | case VBLK: |
| 298 | /* FALLTHROUGH */ |
| 299 | case VCHR: |
| 300 | /* FALLTHROUGH */ |
| 301 | case VSOCK: |
| 302 | /* FALLTHROUGH */ |
| 303 | case VFIFO: |
| 304 | break; |
| 305 | |
| 306 | default: |
| 307 | error = EINVAL; |
| 308 | goto out; |
| 309 | } |
| 310 | |
| 311 | if ((v->a_mode & VWRITE) && (node->tn_flags & IMMUTABLE)) { |
| 312 | error = EPERM; |
| 313 | goto out; |
| 314 | } |
| 315 | |
| 316 | error = vop_helper_access(v, node->tn_uid, node->tn_gid, |
| 317 | node->tn_mode, 0); |
| 318 | out: |
| 319 | return error; |
| 320 | } |
| 321 | |
| 322 | /* --------------------------------------------------------------------- */ |
| 323 | |
| 324 | int |
| 325 | tmpfs_getattr(struct vop_getattr_args *v) |
| 326 | { |
| 327 | struct vnode *vp = v->a_vp; |
| 328 | struct vattr *vap = v->a_vap; |
| 329 | struct tmpfs_node *node; |
| 330 | |
| 331 | node = VP_TO_TMPFS_NODE(vp); |
| 332 | |
| 333 | tmpfs_update(vp); |
| 334 | |
| 335 | TMPFS_NODE_LOCK_SH(node); |
| 336 | vap->va_type = vp->v_type; |
| 337 | vap->va_mode = node->tn_mode; |
| 338 | vap->va_nlink = node->tn_links; |
| 339 | vap->va_uid = node->tn_uid; |
| 340 | vap->va_gid = node->tn_gid; |
| 341 | vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; |
| 342 | vap->va_fileid = node->tn_id; |
| 343 | vap->va_size = node->tn_size; |
| 344 | vap->va_blocksize = PAGE_SIZE; |
| 345 | vap->va_atime.tv_sec = node->tn_atime; |
| 346 | vap->va_atime.tv_nsec = node->tn_atimensec; |
| 347 | vap->va_mtime.tv_sec = node->tn_mtime; |
| 348 | vap->va_mtime.tv_nsec = node->tn_mtimensec; |
| 349 | vap->va_ctime.tv_sec = node->tn_ctime; |
| 350 | vap->va_ctime.tv_nsec = node->tn_ctimensec; |
| 351 | vap->va_gen = node->tn_gen; |
| 352 | vap->va_flags = node->tn_flags; |
| 353 | if (vp->v_type == VBLK || vp->v_type == VCHR) { |
| 354 | vap->va_rmajor = umajor(node->tn_rdev); |
| 355 | vap->va_rminor = uminor(node->tn_rdev); |
| 356 | } |
| 357 | vap->va_bytes = round_page(node->tn_size); |
| 358 | vap->va_filerev = 0; |
| 359 | TMPFS_NODE_UNLOCK(node); |
| 360 | |
| 361 | return 0; |
| 362 | } |
| 363 | |
| 364 | /* --------------------------------------------------------------------- */ |
| 365 | |
| 366 | int |
| 367 | tmpfs_setattr(struct vop_setattr_args *v) |
| 368 | { |
| 369 | struct vnode *vp = v->a_vp; |
| 370 | struct vattr *vap = v->a_vap; |
| 371 | struct ucred *cred = v->a_cred; |
| 372 | struct tmpfs_node *node = VP_TO_TMPFS_NODE(vp); |
| 373 | int error = 0; |
| 374 | int kflags = 0; |
| 375 | |
| 376 | TMPFS_NODE_LOCK(node); |
| 377 | if (error == 0 && (vap->va_flags != VNOVAL)) { |
| 378 | error = tmpfs_chflags(vp, vap->va_flags, cred); |
| 379 | kflags |= NOTE_ATTRIB; |
| 380 | } |
| 381 | |
| 382 | if (error == 0 && (vap->va_size != VNOVAL)) { |
| 383 | if (vap->va_size > node->tn_size) |
| 384 | kflags |= NOTE_WRITE | NOTE_EXTEND; |
| 385 | else |
| 386 | kflags |= NOTE_WRITE; |
| 387 | error = tmpfs_chsize(vp, vap->va_size, cred); |
| 388 | } |
| 389 | |
| 390 | if (error == 0 && (vap->va_uid != (uid_t)VNOVAL || |
| 391 | vap->va_gid != (gid_t)VNOVAL)) { |
| 392 | error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred); |
| 393 | kflags |= NOTE_ATTRIB; |
| 394 | } |
| 395 | |
| 396 | if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) { |
| 397 | error = tmpfs_chmod(vp, vap->va_mode, cred); |
| 398 | kflags |= NOTE_ATTRIB; |
| 399 | } |
| 400 | |
| 401 | if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && |
| 402 | vap->va_atime.tv_nsec != VNOVAL) || |
| 403 | (vap->va_mtime.tv_sec != VNOVAL && |
| 404 | vap->va_mtime.tv_nsec != VNOVAL) )) { |
| 405 | error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, |
| 406 | vap->va_vaflags, cred); |
| 407 | kflags |= NOTE_ATTRIB; |
| 408 | } |
| 409 | |
| 410 | /* |
| 411 | * Update the node times. We give preference to the error codes |
| 412 | * generated by this function rather than the ones that may arise |
| 413 | * from tmpfs_update. |
| 414 | */ |
| 415 | tmpfs_update(vp); |
| 416 | TMPFS_NODE_UNLOCK(node); |
| 417 | tmpfs_knote(vp, kflags); |
| 418 | |
| 419 | return (error); |
| 420 | } |
| 421 | |
| 422 | /* --------------------------------------------------------------------- */ |
| 423 | |
| 424 | /* |
| 425 | * fsync is usually a NOP, but we must take action when unmounting or |
| 426 | * when recycling. |
| 427 | */ |
| 428 | static int |
| 429 | tmpfs_fsync(struct vop_fsync_args *v) |
| 430 | { |
| 431 | struct tmpfs_node *node; |
| 432 | struct vnode *vp = v->a_vp; |
| 433 | |
| 434 | node = VP_TO_TMPFS_NODE(vp); |
| 435 | |
| 436 | tmpfs_update(vp); |
| 437 | if (vp->v_type == VREG) { |
| 438 | if (vp->v_flag & VRECLAIMED) { |
| 439 | if (node->tn_links == 0) |
| 440 | tmpfs_truncate(vp, 0); |
| 441 | else |
| 442 | vfsync(v->a_vp, v->a_waitfor, 1, NULL, NULL); |
| 443 | } |
| 444 | } |
| 445 | return 0; |
| 446 | } |
| 447 | |
| 448 | /* --------------------------------------------------------------------- */ |
| 449 | |
| 450 | static int |
| 451 | tmpfs_read (struct vop_read_args *ap) |
| 452 | { |
| 453 | struct buf *bp; |
| 454 | struct vnode *vp = ap->a_vp; |
| 455 | struct uio *uio = ap->a_uio; |
| 456 | struct tmpfs_node *node; |
| 457 | off_t base_offset; |
| 458 | size_t offset; |
| 459 | size_t len; |
| 460 | size_t resid; |
| 461 | int error; |
| 462 | |
| 463 | /* |
| 464 | * Check the basics |
| 465 | */ |
| 466 | if (uio->uio_offset < 0) |
| 467 | return (EINVAL); |
| 468 | if (vp->v_type != VREG) |
| 469 | return (EINVAL); |
| 470 | |
| 471 | /* |
| 472 | * Extract node, try to shortcut the operation through |
| 473 | * the VM page cache, allowing us to avoid buffer cache |
| 474 | * overheads. |
| 475 | */ |
| 476 | node = VP_TO_TMPFS_NODE(vp); |
| 477 | resid = uio->uio_resid; |
| 478 | error = vop_helper_read_shortcut(ap); |
| 479 | if (error) |
| 480 | return error; |
| 481 | if (uio->uio_resid == 0) { |
| 482 | if (resid) |
| 483 | goto finished; |
| 484 | return error; |
| 485 | } |
| 486 | |
| 487 | /* |
| 488 | * Fall-through to our normal read code. |
| 489 | */ |
| 490 | while (uio->uio_resid > 0 && uio->uio_offset < node->tn_size) { |
| 491 | /* |
| 492 | * Use buffer cache I/O (via tmpfs_strategy) |
| 493 | */ |
| 494 | offset = (size_t)uio->uio_offset & TMPFS_BLKMASK64; |
| 495 | base_offset = (off_t)uio->uio_offset - offset; |
| 496 | bp = getcacheblk(vp, base_offset, TMPFS_BLKSIZE, 0); |
| 497 | if (bp == NULL) { |
| 498 | error = bread(vp, base_offset, TMPFS_BLKSIZE, &bp); |
| 499 | if (error) { |
| 500 | brelse(bp); |
| 501 | kprintf("tmpfs_read bread error %d\n", error); |
| 502 | break; |
| 503 | } |
| 504 | |
| 505 | /* |
| 506 | * tmpfs pretty much fiddles directly with the VM |
| 507 | * system, don't let it exhaust it or we won't play |
| 508 | * nice with other processes. |
| 509 | * |
| 510 | * Only do this if the VOP is coming from a normal |
| 511 | * read/write. The VM system handles the case for |
| 512 | * UIO_NOCOPY. |
| 513 | */ |
| 514 | if (uio->uio_segflg != UIO_NOCOPY) |
| 515 | vm_wait_nominal(); |
| 516 | } |
| 517 | bp->b_flags |= B_CLUSTEROK; |
| 518 | |
| 519 | /* |
| 520 | * Figure out how many bytes we can actually copy this loop. |
| 521 | */ |
| 522 | len = TMPFS_BLKSIZE - offset; |
| 523 | if (len > uio->uio_resid) |
| 524 | len = uio->uio_resid; |
| 525 | if (len > node->tn_size - uio->uio_offset) |
| 526 | len = (size_t)(node->tn_size - uio->uio_offset); |
| 527 | |
| 528 | error = uiomovebp(bp, (char *)bp->b_data + offset, len, uio); |
| 529 | bqrelse(bp); |
| 530 | if (error) { |
| 531 | kprintf("tmpfs_read uiomove error %d\n", error); |
| 532 | break; |
| 533 | } |
| 534 | } |
| 535 | |
| 536 | finished: |
| 537 | if ((node->tn_status & TMPFS_NODE_ACCESSED) == 0) { |
| 538 | TMPFS_NODE_LOCK(node); |
| 539 | node->tn_status |= TMPFS_NODE_ACCESSED; |
| 540 | TMPFS_NODE_UNLOCK(node); |
| 541 | } |
| 542 | return (error); |
| 543 | } |
| 544 | |
| 545 | static int |
| 546 | tmpfs_write (struct vop_write_args *ap) |
| 547 | { |
| 548 | struct buf *bp; |
| 549 | struct vnode *vp = ap->a_vp; |
| 550 | struct uio *uio = ap->a_uio; |
| 551 | struct thread *td = uio->uio_td; |
| 552 | struct tmpfs_node *node; |
| 553 | boolean_t extended; |
| 554 | off_t oldsize; |
| 555 | int error; |
| 556 | off_t base_offset; |
| 557 | size_t offset; |
| 558 | size_t len; |
| 559 | struct rlimit limit; |
| 560 | int trivial = 0; |
| 561 | int kflags = 0; |
| 562 | int seqcount; |
| 563 | |
| 564 | error = 0; |
| 565 | if (uio->uio_resid == 0) { |
| 566 | return error; |
| 567 | } |
| 568 | |
| 569 | node = VP_TO_TMPFS_NODE(vp); |
| 570 | |
| 571 | if (vp->v_type != VREG) |
| 572 | return (EINVAL); |
| 573 | seqcount = ap->a_ioflag >> 16; |
| 574 | |
| 575 | TMPFS_NODE_LOCK(node); |
| 576 | |
| 577 | oldsize = node->tn_size; |
| 578 | if (ap->a_ioflag & IO_APPEND) |
| 579 | uio->uio_offset = node->tn_size; |
| 580 | |
| 581 | /* |
| 582 | * Check for illegal write offsets. |
| 583 | */ |
| 584 | if (uio->uio_offset + uio->uio_resid > |
| 585 | VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) { |
| 586 | error = EFBIG; |
| 587 | goto done; |
| 588 | } |
| 589 | |
| 590 | /* |
| 591 | * NOTE: Ignore if UIO does not come from a user thread (e.g. VN). |
| 592 | */ |
| 593 | if (vp->v_type == VREG && td != NULL && td->td_lwp != NULL) { |
| 594 | error = kern_getrlimit(RLIMIT_FSIZE, &limit); |
| 595 | if (error) |
| 596 | goto done; |
| 597 | if (uio->uio_offset + uio->uio_resid > limit.rlim_cur) { |
| 598 | ksignal(td->td_proc, SIGXFSZ); |
| 599 | error = EFBIG; |
| 600 | goto done; |
| 601 | } |
| 602 | } |
| 603 | |
| 604 | /* |
| 605 | * Extend the file's size if necessary |
| 606 | */ |
| 607 | extended = ((uio->uio_offset + uio->uio_resid) > node->tn_size); |
| 608 | |
| 609 | while (uio->uio_resid > 0) { |
| 610 | /* |
| 611 | * Don't completely blow out running buffer I/O |
| 612 | * when being hit from the pageout daemon. |
| 613 | */ |
| 614 | if (uio->uio_segflg == UIO_NOCOPY && |
| 615 | (ap->a_ioflag & IO_RECURSE) == 0) { |
| 616 | bwillwrite(TMPFS_BLKSIZE); |
| 617 | } |
| 618 | |
| 619 | /* |
| 620 | * Use buffer cache I/O (via tmpfs_strategy) |
| 621 | */ |
| 622 | offset = (size_t)uio->uio_offset & TMPFS_BLKMASK64; |
| 623 | base_offset = (off_t)uio->uio_offset - offset; |
| 624 | len = TMPFS_BLKSIZE - offset; |
| 625 | if (len > uio->uio_resid) |
| 626 | len = uio->uio_resid; |
| 627 | |
| 628 | if ((uio->uio_offset + len) > node->tn_size) { |
| 629 | trivial = (uio->uio_offset <= node->tn_size); |
| 630 | error = tmpfs_reg_resize(vp, uio->uio_offset + len, |
| 631 | trivial); |
| 632 | if (error) |
| 633 | break; |
| 634 | } |
| 635 | |
| 636 | /* |
| 637 | * Read to fill in any gaps. Theoretically we could |
| 638 | * optimize this if the write covers the entire buffer |
| 639 | * and is not a UIO_NOCOPY write, however this can lead |
| 640 | * to a security violation exposing random kernel memory |
| 641 | * (whatever junk was in the backing VM pages before). |
| 642 | * |
| 643 | * So just use bread() to do the right thing. |
| 644 | */ |
| 645 | error = bread(vp, base_offset, TMPFS_BLKSIZE, &bp); |
| 646 | error = uiomovebp(bp, (char *)bp->b_data + offset, len, uio); |
| 647 | if (error) { |
| 648 | kprintf("tmpfs_write uiomove error %d\n", error); |
| 649 | brelse(bp); |
| 650 | break; |
| 651 | } |
| 652 | |
| 653 | if (uio->uio_offset > node->tn_size) { |
| 654 | node->tn_size = uio->uio_offset; |
| 655 | kflags |= NOTE_EXTEND; |
| 656 | } |
| 657 | kflags |= NOTE_WRITE; |
| 658 | |
| 659 | /* |
| 660 | * Always try to flush the page in the UIO_NOCOPY case. This |
| 661 | * can come from the pageout daemon or during vnode eviction. |
| 662 | * It is not necessarily going to be marked IO_ASYNC/IO_SYNC. |
| 663 | * |
| 664 | * For the normal case we buwrite(), dirtying the underlying |
| 665 | * VM pages instead of dirtying the buffer and releasing the |
| 666 | * buffer as a clean buffer. This allows tmpfs to use |
| 667 | * essentially all available memory to cache file data. |
| 668 | * If we used bdwrite() the buffer cache would wind up |
| 669 | * flushing the data to swap too quickly. |
| 670 | * |
| 671 | * But because tmpfs can seriously load the VM system we |
| 672 | * fall-back to using bdwrite() when free memory starts |
| 673 | * to get low. This shifts the load away from the VM system |
| 674 | * and makes tmpfs act more like a normal filesystem with |
| 675 | * regards to disk activity. |
| 676 | * |
| 677 | * tmpfs pretty much fiddles directly with the VM |
| 678 | * system, don't let it exhaust it or we won't play |
| 679 | * nice with other processes. Only do this if the |
| 680 | * VOP is coming from a normal read/write. The VM system |
| 681 | * handles the case for UIO_NOCOPY. |
| 682 | */ |
| 683 | bp->b_flags |= B_CLUSTEROK; |
| 684 | if (uio->uio_segflg == UIO_NOCOPY) { |
| 685 | /* |
| 686 | * Flush from the pageout daemon, deal with |
| 687 | * potentially very heavy tmpfs write activity |
| 688 | * causing long stalls in the pageout daemon |
| 689 | * before pages get to free/cache. |
| 690 | * |
| 691 | * (a) Under severe pressure setting B_DIRECT will |
| 692 | * cause a buffer release to try to free the |
| 693 | * underlying pages. |
| 694 | * |
| 695 | * (b) Under modest memory pressure the B_RELBUF |
| 696 | * alone is sufficient to get the pages moved |
| 697 | * to the cache. We could also force this by |
| 698 | * setting B_NOTMETA but that might have other |
| 699 | * unintended side-effects (e.g. setting |
| 700 | * PG_NOTMETA on the VM page). |
| 701 | * |
| 702 | * Hopefully this will unblock the VM system more |
| 703 | * quickly under extreme tmpfs write load. |
| 704 | */ |
| 705 | if (vm_page_count_min(vm_page_free_hysteresis)) |
| 706 | bp->b_flags |= B_DIRECT; |
| 707 | bp->b_flags |= B_AGE | B_RELBUF; |
| 708 | bp->b_act_count = 0; /* buffer->deactivate pgs */ |
| 709 | cluster_awrite(bp); |
| 710 | } else if (vm_page_count_target()) { |
| 711 | /* |
| 712 | * Normal (userland) write but we are low on memory, |
| 713 | * run the buffer the buffer cache. |
| 714 | */ |
| 715 | bp->b_act_count = 0; /* buffer->deactivate pgs */ |
| 716 | bdwrite(bp); |
| 717 | } else { |
| 718 | /* |
| 719 | * Otherwise run the buffer directly through to the |
| 720 | * backing VM store. |
| 721 | */ |
| 722 | buwrite(bp); |
| 723 | /*vm_wait_nominal();*/ |
| 724 | } |
| 725 | |
| 726 | if (bp->b_error) { |
| 727 | kprintf("tmpfs_write bwrite error %d\n", bp->b_error); |
| 728 | break; |
| 729 | } |
| 730 | } |
| 731 | |
| 732 | if (error) { |
| 733 | if (extended) { |
| 734 | (void)tmpfs_reg_resize(vp, oldsize, trivial); |
| 735 | kflags &= ~NOTE_EXTEND; |
| 736 | } |
| 737 | goto done; |
| 738 | } |
| 739 | |
| 740 | /* |
| 741 | * Currently we don't set the mtime on files modified via mmap() |
| 742 | * because we can't tell the difference between those modifications |
| 743 | * and an attempt by the pageout daemon to flush tmpfs pages to |
| 744 | * swap. |
| 745 | * |
| 746 | * This is because in order to defer flushes as long as possible |
| 747 | * buwrite() works by marking the underlying VM pages dirty in |
| 748 | * order to be able to dispose of the buffer cache buffer without |
| 749 | * flushing it. |
| 750 | */ |
| 751 | if (uio->uio_segflg != UIO_NOCOPY) |
| 752 | node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED; |
| 753 | if (extended) |
| 754 | node->tn_status |= TMPFS_NODE_CHANGED; |
| 755 | |
| 756 | if (node->tn_mode & (S_ISUID | S_ISGID)) { |
| 757 | if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID, 0)) |
| 758 | node->tn_mode &= ~(S_ISUID | S_ISGID); |
| 759 | } |
| 760 | done: |
| 761 | TMPFS_NODE_UNLOCK(node); |
| 762 | if (kflags) |
| 763 | tmpfs_knote(vp, kflags); |
| 764 | |
| 765 | return(error); |
| 766 | } |
| 767 | |
| 768 | static int |
| 769 | tmpfs_advlock (struct vop_advlock_args *ap) |
| 770 | { |
| 771 | struct tmpfs_node *node; |
| 772 | struct vnode *vp = ap->a_vp; |
| 773 | int error; |
| 774 | |
| 775 | node = VP_TO_TMPFS_NODE(vp); |
| 776 | error = (lf_advlock(ap, &node->tn_advlock, node->tn_size)); |
| 777 | |
| 778 | return (error); |
| 779 | } |
| 780 | |
| 781 | /* |
| 782 | * The strategy function is typically only called when memory pressure |
| 783 | * forces the system to attempt to pageout pages. It can also be called |
| 784 | * by [n]vtruncbuf() when a truncation cuts a page in half. Normal write |
| 785 | * operations |
| 786 | */ |
| 787 | static int |
| 788 | tmpfs_strategy(struct vop_strategy_args *ap) |
| 789 | { |
| 790 | struct bio *bio = ap->a_bio; |
| 791 | struct bio *nbio; |
| 792 | struct buf *bp = bio->bio_buf; |
| 793 | struct vnode *vp = ap->a_vp; |
| 794 | struct tmpfs_node *node; |
| 795 | vm_object_t uobj; |
| 796 | vm_page_t m; |
| 797 | int i; |
| 798 | |
| 799 | if (vp->v_type != VREG) { |
| 800 | bp->b_resid = bp->b_bcount; |
| 801 | bp->b_flags |= B_ERROR | B_INVAL; |
| 802 | bp->b_error = EINVAL; |
| 803 | biodone(bio); |
| 804 | return(0); |
| 805 | } |
| 806 | |
| 807 | node = VP_TO_TMPFS_NODE(vp); |
| 808 | |
| 809 | uobj = node->tn_reg.tn_aobj; |
| 810 | |
| 811 | /* |
| 812 | * Don't bother flushing to swap if there is no swap, just |
| 813 | * ensure that the pages are marked as needing a commit (still). |
| 814 | */ |
| 815 | if (bp->b_cmd == BUF_CMD_WRITE && vm_swap_size == 0) { |
| 816 | for (i = 0; i < bp->b_xio.xio_npages; ++i) { |
| 817 | m = bp->b_xio.xio_pages[i]; |
| 818 | vm_page_need_commit(m); |
| 819 | } |
| 820 | bp->b_resid = 0; |
| 821 | bp->b_error = 0; |
| 822 | biodone(bio); |
| 823 | } else { |
| 824 | nbio = push_bio(bio); |
| 825 | nbio->bio_done = tmpfs_strategy_done; |
| 826 | nbio->bio_offset = bio->bio_offset; |
| 827 | swap_pager_strategy(uobj, nbio); |
| 828 | } |
| 829 | return 0; |
| 830 | } |
| 831 | |
| 832 | /* |
| 833 | * If we were unable to commit the pages to swap make sure they are marked |
| 834 | * as needing a commit (again). If we were, clear the flag to allow the |
| 835 | * pages to be freed. |
| 836 | */ |
| 837 | static void |
| 838 | tmpfs_strategy_done(struct bio *bio) |
| 839 | { |
| 840 | struct buf *bp; |
| 841 | vm_page_t m; |
| 842 | int i; |
| 843 | |
| 844 | bp = bio->bio_buf; |
| 845 | |
| 846 | if (bp->b_flags & B_ERROR) { |
| 847 | bp->b_flags &= ~B_ERROR; |
| 848 | bp->b_error = 0; |
| 849 | bp->b_resid = 0; |
| 850 | for (i = 0; i < bp->b_xio.xio_npages; ++i) { |
| 851 | m = bp->b_xio.xio_pages[i]; |
| 852 | vm_page_need_commit(m); |
| 853 | } |
| 854 | } else { |
| 855 | for (i = 0; i < bp->b_xio.xio_npages; ++i) { |
| 856 | m = bp->b_xio.xio_pages[i]; |
| 857 | vm_page_clear_commit(m); |
| 858 | } |
| 859 | } |
| 860 | bio = pop_bio(bio); |
| 861 | biodone(bio); |
| 862 | } |
| 863 | |
| 864 | static int |
| 865 | tmpfs_bmap(struct vop_bmap_args *ap) |
| 866 | { |
| 867 | if (ap->a_doffsetp != NULL) |
| 868 | *ap->a_doffsetp = ap->a_loffset; |
| 869 | if (ap->a_runp != NULL) |
| 870 | *ap->a_runp = 0; |
| 871 | if (ap->a_runb != NULL) |
| 872 | *ap->a_runb = 0; |
| 873 | |
| 874 | return 0; |
| 875 | } |
| 876 | |
| 877 | /* --------------------------------------------------------------------- */ |
| 878 | |
| 879 | static int |
| 880 | tmpfs_nremove(struct vop_nremove_args *v) |
| 881 | { |
| 882 | struct vnode *dvp = v->a_dvp; |
| 883 | struct namecache *ncp = v->a_nch->ncp; |
| 884 | struct vnode *vp; |
| 885 | int error; |
| 886 | struct tmpfs_dirent *de; |
| 887 | struct tmpfs_mount *tmp; |
| 888 | struct tmpfs_node *dnode; |
| 889 | struct tmpfs_node *node; |
| 890 | struct mount *mp; |
| 891 | |
| 892 | mp = dvp->v_mount; |
| 893 | |
| 894 | /* |
| 895 | * We have to acquire the vp from v->a_nch because we will likely |
| 896 | * unresolve the namecache entry, and a vrele/vput is needed to |
| 897 | * trigger the tmpfs_inactive/tmpfs_reclaim sequence. |
| 898 | * |
| 899 | * We have to use vget to clear any inactive state on the vnode, |
| 900 | * otherwise the vnode may remain inactive and thus tmpfs_inactive |
| 901 | * will not get called when we release it. |
| 902 | */ |
| 903 | error = cache_vget(v->a_nch, v->a_cred, LK_SHARED, &vp); |
| 904 | KKASSERT(vp->v_mount == dvp->v_mount); |
| 905 | KKASSERT(error == 0); |
| 906 | vn_unlock(vp); |
| 907 | |
| 908 | if (vp->v_type == VDIR) { |
| 909 | error = EISDIR; |
| 910 | goto out2; |
| 911 | } |
| 912 | |
| 913 | dnode = VP_TO_TMPFS_DIR(dvp); |
| 914 | node = VP_TO_TMPFS_NODE(vp); |
| 915 | tmp = VFS_TO_TMPFS(vp->v_mount); |
| 916 | |
| 917 | TMPFS_NODE_LOCK(dnode); |
| 918 | de = tmpfs_dir_lookup(dnode, node, ncp); |
| 919 | if (de == NULL) { |
| 920 | error = ENOENT; |
| 921 | goto out; |
| 922 | } |
| 923 | |
| 924 | /* Files marked as immutable or append-only cannot be deleted. */ |
| 925 | if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || |
| 926 | (dnode->tn_flags & APPEND)) { |
| 927 | error = EPERM; |
| 928 | goto out; |
| 929 | } |
| 930 | |
| 931 | /* Remove the entry from the directory; as it is a file, we do not |
| 932 | * have to change the number of hard links of the directory. */ |
| 933 | tmpfs_dir_detach(dnode, de); |
| 934 | |
| 935 | /* Free the directory entry we just deleted. Note that the node |
| 936 | * referred by it will not be removed until the vnode is really |
| 937 | * reclaimed. */ |
| 938 | tmpfs_free_dirent(tmp, de); |
| 939 | |
| 940 | if (node->tn_links > 0) { |
| 941 | TMPFS_NODE_LOCK(node); |
| 942 | node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ |
| 943 | TMPFS_NODE_MODIFIED; |
| 944 | TMPFS_NODE_UNLOCK(node); |
| 945 | } |
| 946 | |
| 947 | cache_unlink(v->a_nch); |
| 948 | tmpfs_knote(vp, NOTE_DELETE); |
| 949 | error = 0; |
| 950 | |
| 951 | out: |
| 952 | TMPFS_NODE_UNLOCK(dnode); |
| 953 | if (error == 0) |
| 954 | tmpfs_knote(dvp, NOTE_WRITE); |
| 955 | out2: |
| 956 | vrele(vp); |
| 957 | |
| 958 | return error; |
| 959 | } |
| 960 | |
| 961 | /* --------------------------------------------------------------------- */ |
| 962 | |
| 963 | static int |
| 964 | tmpfs_nlink(struct vop_nlink_args *v) |
| 965 | { |
| 966 | struct vnode *dvp = v->a_dvp; |
| 967 | struct vnode *vp = v->a_vp; |
| 968 | struct namecache *ncp = v->a_nch->ncp; |
| 969 | struct tmpfs_dirent *de; |
| 970 | struct tmpfs_node *node; |
| 971 | struct tmpfs_node *dnode; |
| 972 | struct mount *mp; |
| 973 | int error; |
| 974 | |
| 975 | mp = dvp->v_mount; |
| 976 | |
| 977 | KKASSERT(dvp != vp); /* XXX When can this be false? */ |
| 978 | |
| 979 | node = VP_TO_TMPFS_NODE(vp); |
| 980 | dnode = VP_TO_TMPFS_NODE(dvp); |
| 981 | TMPFS_NODE_LOCK(dnode); |
| 982 | |
| 983 | /* XXX: Why aren't the following two tests done by the caller? */ |
| 984 | |
| 985 | /* Hard links of directories are forbidden. */ |
| 986 | if (vp->v_type == VDIR) { |
| 987 | error = EPERM; |
| 988 | goto out; |
| 989 | } |
| 990 | |
| 991 | /* Cannot create cross-device links. */ |
| 992 | if (dvp->v_mount != vp->v_mount) { |
| 993 | error = EXDEV; |
| 994 | goto out; |
| 995 | } |
| 996 | |
| 997 | /* Ensure that we do not overflow the maximum number of links imposed |
| 998 | * by the system. */ |
| 999 | KKASSERT(node->tn_links <= LINK_MAX); |
| 1000 | if (node->tn_links >= LINK_MAX) { |
| 1001 | error = EMLINK; |
| 1002 | goto out; |
| 1003 | } |
| 1004 | |
| 1005 | /* We cannot create links of files marked immutable or append-only. */ |
| 1006 | if (node->tn_flags & (IMMUTABLE | APPEND)) { |
| 1007 | error = EPERM; |
| 1008 | goto out; |
| 1009 | } |
| 1010 | |
| 1011 | /* Allocate a new directory entry to represent the node. */ |
| 1012 | error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, |
| 1013 | ncp->nc_name, ncp->nc_nlen, &de); |
| 1014 | if (error != 0) |
| 1015 | goto out; |
| 1016 | |
| 1017 | /* Insert the new directory entry into the appropriate directory. */ |
| 1018 | tmpfs_dir_attach(dnode, de); |
| 1019 | |
| 1020 | /* vp link count has changed, so update node times. */ |
| 1021 | |
| 1022 | TMPFS_NODE_LOCK(node); |
| 1023 | node->tn_status |= TMPFS_NODE_CHANGED; |
| 1024 | TMPFS_NODE_UNLOCK(node); |
| 1025 | tmpfs_update(vp); |
| 1026 | |
| 1027 | tmpfs_knote(vp, NOTE_LINK); |
| 1028 | cache_setunresolved(v->a_nch); |
| 1029 | cache_setvp(v->a_nch, vp); |
| 1030 | error = 0; |
| 1031 | |
| 1032 | out: |
| 1033 | TMPFS_NODE_UNLOCK(dnode); |
| 1034 | if (error == 0) |
| 1035 | tmpfs_knote(dvp, NOTE_WRITE); |
| 1036 | return error; |
| 1037 | } |
| 1038 | |
| 1039 | /* --------------------------------------------------------------------- */ |
| 1040 | |
| 1041 | static int |
| 1042 | tmpfs_nrename(struct vop_nrename_args *v) |
| 1043 | { |
| 1044 | struct vnode *fdvp = v->a_fdvp; |
| 1045 | struct namecache *fncp = v->a_fnch->ncp; |
| 1046 | struct vnode *fvp = fncp->nc_vp; |
| 1047 | struct vnode *tdvp = v->a_tdvp; |
| 1048 | struct namecache *tncp = v->a_tnch->ncp; |
| 1049 | struct vnode *tvp; |
| 1050 | struct tmpfs_dirent *de, *tde; |
| 1051 | struct tmpfs_mount *tmp; |
| 1052 | struct tmpfs_node *fdnode; |
| 1053 | struct tmpfs_node *fnode; |
| 1054 | struct tmpfs_node *tnode; |
| 1055 | struct tmpfs_node *tdnode; |
| 1056 | struct mount *mp; |
| 1057 | char *newname; |
| 1058 | char *oldname; |
| 1059 | int error; |
| 1060 | |
| 1061 | mp = fdvp->v_mount; |
| 1062 | KKASSERT(fdvp->v_mount == fvp->v_mount); |
| 1063 | |
| 1064 | /* |
| 1065 | * Because tvp can get overwritten we have to vget it instead of |
| 1066 | * just vref or use it, otherwise it's VINACTIVE flag may not get |
| 1067 | * cleared and the node won't get destroyed. |
| 1068 | */ |
| 1069 | error = cache_vget(v->a_tnch, v->a_cred, LK_SHARED, &tvp); |
| 1070 | if (error == 0) { |
| 1071 | tnode = VP_TO_TMPFS_NODE(tvp); |
| 1072 | vn_unlock(tvp); |
| 1073 | } else { |
| 1074 | tnode = NULL; |
| 1075 | } |
| 1076 | |
| 1077 | /* Disallow cross-device renames. |
| 1078 | * XXX Why isn't this done by the caller? */ |
| 1079 | if (fvp->v_mount != tdvp->v_mount || |
| 1080 | (tvp != NULL && fvp->v_mount != tvp->v_mount)) { |
| 1081 | error = EXDEV; |
| 1082 | goto out; |
| 1083 | } |
| 1084 | |
| 1085 | tmp = VFS_TO_TMPFS(tdvp->v_mount); |
| 1086 | tdnode = VP_TO_TMPFS_DIR(tdvp); |
| 1087 | |
| 1088 | /* If source and target are the same file, there is nothing to do. */ |
| 1089 | if (fvp == tvp) { |
| 1090 | error = 0; |
| 1091 | goto out; |
| 1092 | } |
| 1093 | |
| 1094 | fdnode = VP_TO_TMPFS_DIR(fdvp); |
| 1095 | fnode = VP_TO_TMPFS_NODE(fvp); |
| 1096 | TMPFS_NODE_LOCK(fdnode); |
| 1097 | de = tmpfs_dir_lookup(fdnode, fnode, fncp); |
| 1098 | TMPFS_NODE_UNLOCK(fdnode); /* XXX depend on namecache lock */ |
| 1099 | |
| 1100 | /* Avoid manipulating '.' and '..' entries. */ |
| 1101 | if (de == NULL) { |
| 1102 | error = ENOENT; |
| 1103 | goto out_locked; |
| 1104 | } |
| 1105 | KKASSERT(de->td_node == fnode); |
| 1106 | |
| 1107 | /* |
| 1108 | * If replacing an entry in the target directory and that entry |
| 1109 | * is a directory, it must be empty. |
| 1110 | * |
| 1111 | * Kern_rename gurantees the destination to be a directory |
| 1112 | * if the source is one (it does?). |
| 1113 | */ |
| 1114 | if (tvp != NULL) { |
| 1115 | KKASSERT(tnode != NULL); |
| 1116 | |
| 1117 | if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || |
| 1118 | (tdnode->tn_flags & (APPEND | IMMUTABLE))) { |
| 1119 | error = EPERM; |
| 1120 | goto out_locked; |
| 1121 | } |
| 1122 | |
| 1123 | if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { |
| 1124 | if (tnode->tn_size > 0) { |
| 1125 | error = ENOTEMPTY; |
| 1126 | goto out_locked; |
| 1127 | } |
| 1128 | } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { |
| 1129 | error = ENOTDIR; |
| 1130 | goto out_locked; |
| 1131 | } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { |
| 1132 | error = EISDIR; |
| 1133 | goto out_locked; |
| 1134 | } else { |
| 1135 | KKASSERT(fnode->tn_type != VDIR && |
| 1136 | tnode->tn_type != VDIR); |
| 1137 | } |
| 1138 | } |
| 1139 | |
| 1140 | if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || |
| 1141 | (fdnode->tn_flags & (APPEND | IMMUTABLE))) { |
| 1142 | error = EPERM; |
| 1143 | goto out_locked; |
| 1144 | } |
| 1145 | |
| 1146 | /* |
| 1147 | * Ensure that we have enough memory to hold the new name, if it |
| 1148 | * has to be changed. |
| 1149 | */ |
| 1150 | if (fncp->nc_nlen != tncp->nc_nlen || |
| 1151 | bcmp(fncp->nc_name, tncp->nc_name, fncp->nc_nlen) != 0) { |
| 1152 | newname = kmalloc(tncp->nc_nlen + 1, tmp->tm_name_zone, |
| 1153 | M_WAITOK | M_NULLOK); |
| 1154 | if (newname == NULL) { |
| 1155 | error = ENOSPC; |
| 1156 | goto out_locked; |
| 1157 | } |
| 1158 | bcopy(tncp->nc_name, newname, tncp->nc_nlen); |
| 1159 | newname[tncp->nc_nlen] = '\0'; |
| 1160 | } else { |
| 1161 | newname = NULL; |
| 1162 | } |
| 1163 | |
| 1164 | /* |
| 1165 | * Unlink entry from source directory. Note that the kernel has |
| 1166 | * already checked for illegal recursion cases (renaming a directory |
| 1167 | * into a subdirectory of itself). |
| 1168 | */ |
| 1169 | if (fdnode != tdnode) { |
| 1170 | tmpfs_dir_detach(fdnode, de); |
| 1171 | } else { |
| 1172 | /* XXX depend on namecache lock */ |
| 1173 | TMPFS_NODE_LOCK(fdnode); |
| 1174 | KKASSERT(de == tmpfs_dir_lookup(fdnode, fnode, fncp)); |
| 1175 | RB_REMOVE(tmpfs_dirtree, &fdnode->tn_dir.tn_dirtree, de); |
| 1176 | RB_REMOVE(tmpfs_dirtree_cookie, |
| 1177 | &fdnode->tn_dir.tn_cookietree, de); |
| 1178 | TMPFS_NODE_UNLOCK(fdnode); |
| 1179 | } |
| 1180 | |
| 1181 | /* |
| 1182 | * Handle any name change. Swap with newname, we will |
| 1183 | * deallocate it at the end. |
| 1184 | */ |
| 1185 | if (newname != NULL) { |
| 1186 | #if 0 |
| 1187 | TMPFS_NODE_LOCK(fnode); |
| 1188 | fnode->tn_status |= TMPFS_NODE_CHANGED; |
| 1189 | TMPFS_NODE_UNLOCK(fnode); |
| 1190 | #endif |
| 1191 | oldname = de->td_name; |
| 1192 | de->td_name = newname; |
| 1193 | de->td_namelen = (uint16_t)tncp->nc_nlen; |
| 1194 | newname = oldname; |
| 1195 | } |
| 1196 | |
| 1197 | /* |
| 1198 | * If we are overwriting an entry, we have to remove the old one |
| 1199 | * from the target directory. |
| 1200 | */ |
| 1201 | if (tvp != NULL) { |
| 1202 | /* Remove the old entry from the target directory. */ |
| 1203 | TMPFS_NODE_LOCK(tdnode); |
| 1204 | tde = tmpfs_dir_lookup(tdnode, tnode, tncp); |
| 1205 | tmpfs_dir_detach(tdnode, tde); |
| 1206 | TMPFS_NODE_UNLOCK(tdnode); |
| 1207 | tmpfs_knote(tdnode->tn_vnode, NOTE_DELETE); |
| 1208 | |
| 1209 | /* |
| 1210 | * Free the directory entry we just deleted. Note that the |
| 1211 | * node referred by it will not be removed until the vnode is |
| 1212 | * really reclaimed. |
| 1213 | */ |
| 1214 | tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde); |
| 1215 | /*cache_inval_vp(tvp, CINV_DESTROY);*/ |
| 1216 | } |
| 1217 | |
| 1218 | /* |
| 1219 | * Link entry to target directory. If the entry |
| 1220 | * represents a directory move the parent linkage |
| 1221 | * as well. |
| 1222 | */ |
| 1223 | if (fdnode != tdnode) { |
| 1224 | if (de->td_node->tn_type == VDIR) { |
| 1225 | TMPFS_VALIDATE_DIR(fnode); |
| 1226 | } |
| 1227 | tmpfs_dir_attach(tdnode, de); |
| 1228 | } else { |
| 1229 | TMPFS_NODE_LOCK(tdnode); |
| 1230 | tdnode->tn_status |= TMPFS_NODE_MODIFIED; |
| 1231 | RB_INSERT(tmpfs_dirtree, &tdnode->tn_dir.tn_dirtree, de); |
| 1232 | RB_INSERT(tmpfs_dirtree_cookie, |
| 1233 | &tdnode->tn_dir.tn_cookietree, de); |
| 1234 | TMPFS_NODE_UNLOCK(tdnode); |
| 1235 | } |
| 1236 | |
| 1237 | /* |
| 1238 | * Finish up |
| 1239 | */ |
| 1240 | if (newname) { |
| 1241 | kfree(newname, tmp->tm_name_zone); |
| 1242 | newname = NULL; |
| 1243 | } |
| 1244 | cache_rename(v->a_fnch, v->a_tnch); |
| 1245 | tmpfs_knote(v->a_fdvp, NOTE_WRITE); |
| 1246 | tmpfs_knote(v->a_tdvp, NOTE_WRITE); |
| 1247 | if (fnode->tn_vnode) |
| 1248 | tmpfs_knote(fnode->tn_vnode, NOTE_RENAME); |
| 1249 | error = 0; |
| 1250 | |
| 1251 | out_locked: |
| 1252 | ; |
| 1253 | out: |
| 1254 | if (tvp) |
| 1255 | vrele(tvp); |
| 1256 | return error; |
| 1257 | } |
| 1258 | |
| 1259 | /* --------------------------------------------------------------------- */ |
| 1260 | |
| 1261 | static int |
| 1262 | tmpfs_nmkdir(struct vop_nmkdir_args *v) |
| 1263 | { |
| 1264 | struct vnode *dvp = v->a_dvp; |
| 1265 | struct vnode **vpp = v->a_vpp; |
| 1266 | struct namecache *ncp = v->a_nch->ncp; |
| 1267 | struct vattr *vap = v->a_vap; |
| 1268 | struct ucred *cred = v->a_cred; |
| 1269 | struct mount *mp; |
| 1270 | int error; |
| 1271 | |
| 1272 | mp = dvp->v_mount; |
| 1273 | |
| 1274 | KKASSERT(vap->va_type == VDIR); |
| 1275 | |
| 1276 | error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL); |
| 1277 | if (error == 0) { |
| 1278 | cache_setunresolved(v->a_nch); |
| 1279 | cache_setvp(v->a_nch, *vpp); |
| 1280 | tmpfs_knote(dvp, NOTE_WRITE | NOTE_LINK); |
| 1281 | } |
| 1282 | return error; |
| 1283 | } |
| 1284 | |
| 1285 | /* --------------------------------------------------------------------- */ |
| 1286 | |
| 1287 | static int |
| 1288 | tmpfs_nrmdir(struct vop_nrmdir_args *v) |
| 1289 | { |
| 1290 | struct vnode *dvp = v->a_dvp; |
| 1291 | struct namecache *ncp = v->a_nch->ncp; |
| 1292 | struct vnode *vp; |
| 1293 | struct tmpfs_dirent *de; |
| 1294 | struct tmpfs_mount *tmp; |
| 1295 | struct tmpfs_node *dnode; |
| 1296 | struct tmpfs_node *node; |
| 1297 | struct mount *mp; |
| 1298 | int error; |
| 1299 | |
| 1300 | mp = dvp->v_mount; |
| 1301 | |
| 1302 | /* |
| 1303 | * We have to acquire the vp from v->a_nch because we will likely |
| 1304 | * unresolve the namecache entry, and a vrele/vput is needed to |
| 1305 | * trigger the tmpfs_inactive/tmpfs_reclaim sequence. |
| 1306 | * |
| 1307 | * We have to use vget to clear any inactive state on the vnode, |
| 1308 | * otherwise the vnode may remain inactive and thus tmpfs_inactive |
| 1309 | * will not get called when we release it. |
| 1310 | */ |
| 1311 | error = cache_vget(v->a_nch, v->a_cred, LK_SHARED, &vp); |
| 1312 | KKASSERT(error == 0); |
| 1313 | vn_unlock(vp); |
| 1314 | |
| 1315 | /* |
| 1316 | * Prevalidate so we don't hit an assertion later |
| 1317 | */ |
| 1318 | if (vp->v_type != VDIR) { |
| 1319 | error = ENOTDIR; |
| 1320 | goto out; |
| 1321 | } |
| 1322 | |
| 1323 | tmp = VFS_TO_TMPFS(dvp->v_mount); |
| 1324 | dnode = VP_TO_TMPFS_DIR(dvp); |
| 1325 | node = VP_TO_TMPFS_DIR(vp); |
| 1326 | |
| 1327 | /* |
| 1328 | * Directories with more than two entries ('.' and '..') cannot |
| 1329 | * be removed. |
| 1330 | */ |
| 1331 | if (node->tn_size > 0) { |
| 1332 | error = ENOTEMPTY; |
| 1333 | goto out; |
| 1334 | } |
| 1335 | |
| 1336 | if ((dnode->tn_flags & APPEND) |
| 1337 | || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { |
| 1338 | error = EPERM; |
| 1339 | goto out; |
| 1340 | } |
| 1341 | |
| 1342 | /* |
| 1343 | * This invariant holds only if we are not trying to |
| 1344 | * remove "..". We checked for that above so this is safe now. |
| 1345 | */ |
| 1346 | KKASSERT(node->tn_dir.tn_parent == dnode); |
| 1347 | |
| 1348 | /* |
| 1349 | * Get the directory entry associated with node (vp). This |
| 1350 | * was filled by tmpfs_lookup while looking up the entry. |
| 1351 | */ |
| 1352 | TMPFS_NODE_LOCK(dnode); |
| 1353 | de = tmpfs_dir_lookup(dnode, node, ncp); |
| 1354 | KKASSERT(TMPFS_DIRENT_MATCHES(de, ncp->nc_name, ncp->nc_nlen)); |
| 1355 | |
| 1356 | /* Check flags to see if we are allowed to remove the directory. */ |
| 1357 | if ((dnode->tn_flags & APPEND) || |
| 1358 | node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { |
| 1359 | error = EPERM; |
| 1360 | TMPFS_NODE_UNLOCK(dnode); |
| 1361 | goto out; |
| 1362 | } |
| 1363 | |
| 1364 | /* Detach the directory entry from the directory (dnode). */ |
| 1365 | tmpfs_dir_detach(dnode, de); |
| 1366 | TMPFS_NODE_UNLOCK(dnode); |
| 1367 | |
| 1368 | /* No vnode should be allocated for this entry from this point */ |
| 1369 | TMPFS_NODE_LOCK(dnode); |
| 1370 | TMPFS_ASSERT_ELOCKED(dnode); |
| 1371 | TMPFS_NODE_LOCK(node); |
| 1372 | TMPFS_ASSERT_ELOCKED(node); |
| 1373 | |
| 1374 | /* |
| 1375 | * Must set parent linkage to NULL (tested by ncreate to disallow |
| 1376 | * the creation of new files/dirs in a deleted directory) |
| 1377 | */ |
| 1378 | node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | |
| 1379 | TMPFS_NODE_MODIFIED; |
| 1380 | |
| 1381 | dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | |
| 1382 | TMPFS_NODE_MODIFIED; |
| 1383 | |
| 1384 | TMPFS_NODE_UNLOCK(node); |
| 1385 | TMPFS_NODE_UNLOCK(dnode); |
| 1386 | |
| 1387 | /* Free the directory entry we just deleted. Note that the node |
| 1388 | * referred by it will not be removed until the vnode is really |
| 1389 | * reclaimed. */ |
| 1390 | tmpfs_free_dirent(tmp, de); |
| 1391 | |
| 1392 | /* Release the deleted vnode (will destroy the node, notify |
| 1393 | * interested parties and clean it from the cache). */ |
| 1394 | |
| 1395 | TMPFS_NODE_LOCK(dnode); |
| 1396 | dnode->tn_status |= TMPFS_NODE_CHANGED; |
| 1397 | TMPFS_NODE_UNLOCK(dnode); |
| 1398 | tmpfs_update(dvp); |
| 1399 | |
| 1400 | cache_unlink(v->a_nch); |
| 1401 | tmpfs_knote(dvp, NOTE_WRITE | NOTE_LINK); |
| 1402 | error = 0; |
| 1403 | |
| 1404 | out: |
| 1405 | vrele(vp); |
| 1406 | |
| 1407 | return error; |
| 1408 | } |
| 1409 | |
| 1410 | /* --------------------------------------------------------------------- */ |
| 1411 | |
| 1412 | static int |
| 1413 | tmpfs_nsymlink(struct vop_nsymlink_args *v) |
| 1414 | { |
| 1415 | struct vnode *dvp = v->a_dvp; |
| 1416 | struct vnode **vpp = v->a_vpp; |
| 1417 | struct namecache *ncp = v->a_nch->ncp; |
| 1418 | struct vattr *vap = v->a_vap; |
| 1419 | struct ucred *cred = v->a_cred; |
| 1420 | char *target = v->a_target; |
| 1421 | int error; |
| 1422 | |
| 1423 | vap->va_type = VLNK; |
| 1424 | error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, target); |
| 1425 | if (error == 0) { |
| 1426 | tmpfs_knote(*vpp, NOTE_WRITE); |
| 1427 | cache_setunresolved(v->a_nch); |
| 1428 | cache_setvp(v->a_nch, *vpp); |
| 1429 | } |
| 1430 | return error; |
| 1431 | } |
| 1432 | |
| 1433 | /* --------------------------------------------------------------------- */ |
| 1434 | |
| 1435 | static int |
| 1436 | tmpfs_readdir(struct vop_readdir_args *v) |
| 1437 | { |
| 1438 | struct vnode *vp = v->a_vp; |
| 1439 | struct uio *uio = v->a_uio; |
| 1440 | int *eofflag = v->a_eofflag; |
| 1441 | off_t **cookies = v->a_cookies; |
| 1442 | int *ncookies = v->a_ncookies; |
| 1443 | struct tmpfs_mount *tmp; |
| 1444 | int error; |
| 1445 | off_t startoff; |
| 1446 | off_t cnt = 0; |
| 1447 | struct tmpfs_node *node; |
| 1448 | |
| 1449 | /* This operation only makes sense on directory nodes. */ |
| 1450 | if (vp->v_type != VDIR) { |
| 1451 | return ENOTDIR; |
| 1452 | } |
| 1453 | |
| 1454 | tmp = VFS_TO_TMPFS(vp->v_mount); |
| 1455 | node = VP_TO_TMPFS_DIR(vp); |
| 1456 | startoff = uio->uio_offset; |
| 1457 | |
| 1458 | if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { |
| 1459 | error = tmpfs_dir_getdotdent(node, uio); |
| 1460 | if (error != 0) { |
| 1461 | TMPFS_NODE_LOCK_SH(node); |
| 1462 | goto outok; |
| 1463 | } |
| 1464 | cnt++; |
| 1465 | } |
| 1466 | |
| 1467 | if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { |
| 1468 | /* may lock parent, cannot hold node lock */ |
| 1469 | error = tmpfs_dir_getdotdotdent(tmp, node, uio); |
| 1470 | if (error != 0) { |
| 1471 | TMPFS_NODE_LOCK_SH(node); |
| 1472 | goto outok; |
| 1473 | } |
| 1474 | cnt++; |
| 1475 | } |
| 1476 | |
| 1477 | TMPFS_NODE_LOCK_SH(node); |
| 1478 | error = tmpfs_dir_getdents(node, uio, &cnt); |
| 1479 | |
| 1480 | outok: |
| 1481 | KKASSERT(error >= -1); |
| 1482 | |
| 1483 | if (error == -1) |
| 1484 | error = 0; |
| 1485 | |
| 1486 | if (eofflag != NULL) |
| 1487 | *eofflag = |
| 1488 | (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); |
| 1489 | |
| 1490 | /* Update NFS-related variables. */ |
| 1491 | if (error == 0 && cookies != NULL && ncookies != NULL) { |
| 1492 | off_t i; |
| 1493 | off_t off = startoff; |
| 1494 | struct tmpfs_dirent *de = NULL; |
| 1495 | |
| 1496 | *ncookies = cnt; |
| 1497 | *cookies = kmalloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); |
| 1498 | |
| 1499 | for (i = 0; i < cnt; i++) { |
| 1500 | KKASSERT(off != TMPFS_DIRCOOKIE_EOF); |
| 1501 | if (off == TMPFS_DIRCOOKIE_DOT) { |
| 1502 | off = TMPFS_DIRCOOKIE_DOTDOT; |
| 1503 | } else { |
| 1504 | if (off == TMPFS_DIRCOOKIE_DOTDOT) { |
| 1505 | de = RB_MIN(tmpfs_dirtree_cookie, |
| 1506 | &node->tn_dir.tn_cookietree); |
| 1507 | } else if (de != NULL) { |
| 1508 | de = RB_NEXT(tmpfs_dirtree_cookie, |
| 1509 | &node->tn_dir.tn_cookietree, de); |
| 1510 | } else { |
| 1511 | de = tmpfs_dir_lookupbycookie(node, |
| 1512 | off); |
| 1513 | KKASSERT(de != NULL); |
| 1514 | de = RB_NEXT(tmpfs_dirtree_cookie, |
| 1515 | &node->tn_dir.tn_cookietree, de); |
| 1516 | } |
| 1517 | if (de == NULL) |
| 1518 | off = TMPFS_DIRCOOKIE_EOF; |
| 1519 | else |
| 1520 | off = tmpfs_dircookie(de); |
| 1521 | } |
| 1522 | (*cookies)[i] = off; |
| 1523 | } |
| 1524 | KKASSERT(uio->uio_offset == off); |
| 1525 | } |
| 1526 | TMPFS_NODE_UNLOCK(node); |
| 1527 | |
| 1528 | if ((node->tn_status & TMPFS_NODE_ACCESSED) == 0) { |
| 1529 | TMPFS_NODE_LOCK(node); |
| 1530 | node->tn_status |= TMPFS_NODE_ACCESSED; |
| 1531 | TMPFS_NODE_UNLOCK(node); |
| 1532 | } |
| 1533 | return error; |
| 1534 | } |
| 1535 | |
| 1536 | /* --------------------------------------------------------------------- */ |
| 1537 | |
| 1538 | static int |
| 1539 | tmpfs_readlink(struct vop_readlink_args *v) |
| 1540 | { |
| 1541 | struct vnode *vp = v->a_vp; |
| 1542 | struct uio *uio = v->a_uio; |
| 1543 | int error; |
| 1544 | struct tmpfs_node *node; |
| 1545 | |
| 1546 | KKASSERT(uio->uio_offset == 0); |
| 1547 | KKASSERT(vp->v_type == VLNK); |
| 1548 | |
| 1549 | node = VP_TO_TMPFS_NODE(vp); |
| 1550 | TMPFS_NODE_LOCK_SH(node); |
| 1551 | error = uiomove(node->tn_link, |
| 1552 | MIN(node->tn_size, uio->uio_resid), uio); |
| 1553 | TMPFS_NODE_UNLOCK(node); |
| 1554 | if ((node->tn_status & TMPFS_NODE_ACCESSED) == 0) { |
| 1555 | TMPFS_NODE_LOCK(node); |
| 1556 | node->tn_status |= TMPFS_NODE_ACCESSED; |
| 1557 | TMPFS_NODE_UNLOCK(node); |
| 1558 | } |
| 1559 | return error; |
| 1560 | } |
| 1561 | |
| 1562 | /* --------------------------------------------------------------------- */ |
| 1563 | |
| 1564 | static int |
| 1565 | tmpfs_inactive(struct vop_inactive_args *v) |
| 1566 | { |
| 1567 | struct vnode *vp = v->a_vp; |
| 1568 | struct tmpfs_node *node; |
| 1569 | struct mount *mp; |
| 1570 | |
| 1571 | mp = vp->v_mount; |
| 1572 | lwkt_gettoken(&mp->mnt_token); |
| 1573 | node = VP_TO_TMPFS_NODE(vp); |
| 1574 | |
| 1575 | /* |
| 1576 | * Degenerate case |
| 1577 | */ |
| 1578 | if (node == NULL) { |
| 1579 | vrecycle(vp); |
| 1580 | lwkt_reltoken(&mp->mnt_token); |
| 1581 | return(0); |
| 1582 | } |
| 1583 | |
| 1584 | /* |
| 1585 | * Get rid of unreferenced deleted vnodes sooner rather than |
| 1586 | * later so the data memory can be recovered immediately. |
| 1587 | * |
| 1588 | * We must truncate the vnode to prevent the normal reclamation |
| 1589 | * path from flushing the data for the removed file to disk. |
| 1590 | */ |
| 1591 | TMPFS_NODE_LOCK(node); |
| 1592 | if ((node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0 && |
| 1593 | node->tn_links == 0) |
| 1594 | { |
| 1595 | node->tn_vpstate = TMPFS_VNODE_DOOMED; |
| 1596 | TMPFS_NODE_UNLOCK(node); |
| 1597 | if (node->tn_type == VREG) |
| 1598 | tmpfs_truncate(vp, 0); |
| 1599 | vrecycle(vp); |
| 1600 | } else { |
| 1601 | TMPFS_NODE_UNLOCK(node); |
| 1602 | } |
| 1603 | lwkt_reltoken(&mp->mnt_token); |
| 1604 | |
| 1605 | return 0; |
| 1606 | } |
| 1607 | |
| 1608 | /* --------------------------------------------------------------------- */ |
| 1609 | |
| 1610 | int |
| 1611 | tmpfs_reclaim(struct vop_reclaim_args *v) |
| 1612 | { |
| 1613 | struct vnode *vp = v->a_vp; |
| 1614 | struct tmpfs_mount *tmp; |
| 1615 | struct tmpfs_node *node; |
| 1616 | struct mount *mp; |
| 1617 | |
| 1618 | mp = vp->v_mount; |
| 1619 | lwkt_gettoken(&mp->mnt_token); |
| 1620 | |
| 1621 | node = VP_TO_TMPFS_NODE(vp); |
| 1622 | tmp = VFS_TO_TMPFS(vp->v_mount); |
| 1623 | KKASSERT(mp == tmp->tm_mount); |
| 1624 | |
| 1625 | tmpfs_free_vp(vp); |
| 1626 | |
| 1627 | /* |
| 1628 | * If the node referenced by this vnode was deleted by the |
| 1629 | * user, we must free its associated data structures now that |
| 1630 | * the vnode is being reclaimed. |
| 1631 | * |
| 1632 | * Directories have an extra link ref. |
| 1633 | */ |
| 1634 | TMPFS_NODE_LOCK(node); |
| 1635 | if ((node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0 && |
| 1636 | node->tn_links == 0) { |
| 1637 | node->tn_vpstate = TMPFS_VNODE_DOOMED; |
| 1638 | tmpfs_free_node(tmp, node); |
| 1639 | /* eats the lock */ |
| 1640 | } else { |
| 1641 | TMPFS_NODE_UNLOCK(node); |
| 1642 | } |
| 1643 | lwkt_reltoken(&mp->mnt_token); |
| 1644 | |
| 1645 | KKASSERT(vp->v_data == NULL); |
| 1646 | return 0; |
| 1647 | } |
| 1648 | |
| 1649 | /* --------------------------------------------------------------------- */ |
| 1650 | |
| 1651 | static int |
| 1652 | tmpfs_mountctl(struct vop_mountctl_args *ap) |
| 1653 | { |
| 1654 | struct tmpfs_mount *tmp; |
| 1655 | struct mount *mp; |
| 1656 | int rc; |
| 1657 | |
| 1658 | mp = ap->a_head.a_ops->head.vv_mount; |
| 1659 | lwkt_gettoken(&mp->mnt_token); |
| 1660 | |
| 1661 | switch (ap->a_op) { |
| 1662 | case (MOUNTCTL_SET_EXPORT): |
| 1663 | tmp = (struct tmpfs_mount *) mp->mnt_data; |
| 1664 | |
| 1665 | if (ap->a_ctllen != sizeof(struct export_args)) |
| 1666 | rc = (EINVAL); |
| 1667 | else |
| 1668 | rc = vfs_export(mp, &tmp->tm_export, |
| 1669 | (const struct export_args *) ap->a_ctl); |
| 1670 | break; |
| 1671 | default: |
| 1672 | rc = vop_stdmountctl(ap); |
| 1673 | break; |
| 1674 | } |
| 1675 | |
| 1676 | lwkt_reltoken(&mp->mnt_token); |
| 1677 | return (rc); |
| 1678 | } |
| 1679 | |
| 1680 | /* --------------------------------------------------------------------- */ |
| 1681 | |
| 1682 | static int |
| 1683 | tmpfs_print(struct vop_print_args *v) |
| 1684 | { |
| 1685 | struct vnode *vp = v->a_vp; |
| 1686 | |
| 1687 | struct tmpfs_node *node; |
| 1688 | |
| 1689 | node = VP_TO_TMPFS_NODE(vp); |
| 1690 | |
| 1691 | kprintf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", |
| 1692 | node, node->tn_flags, node->tn_links); |
| 1693 | kprintf("\tmode 0%o, owner %d, group %d, size %ju, status 0x%x\n", |
| 1694 | node->tn_mode, node->tn_uid, node->tn_gid, |
| 1695 | (uintmax_t)node->tn_size, node->tn_status); |
| 1696 | |
| 1697 | if (vp->v_type == VFIFO) |
| 1698 | fifo_printinfo(vp); |
| 1699 | |
| 1700 | kprintf("\n"); |
| 1701 | |
| 1702 | return 0; |
| 1703 | } |
| 1704 | |
| 1705 | /* --------------------------------------------------------------------- */ |
| 1706 | |
| 1707 | static int |
| 1708 | tmpfs_pathconf(struct vop_pathconf_args *v) |
| 1709 | { |
| 1710 | struct vnode *vp = v->a_vp; |
| 1711 | int name = v->a_name; |
| 1712 | register_t *retval = v->a_retval; |
| 1713 | struct tmpfs_mount *tmp; |
| 1714 | int error; |
| 1715 | |
| 1716 | error = 0; |
| 1717 | |
| 1718 | switch (name) { |
| 1719 | case _PC_CHOWN_RESTRICTED: |
| 1720 | *retval = 1; |
| 1721 | break; |
| 1722 | |
| 1723 | case _PC_FILESIZEBITS: |
| 1724 | tmp = VFS_TO_TMPFS(vp->v_mount); |
| 1725 | *retval = max(32, flsll(tmp->tm_pages_max * PAGE_SIZE) + 1); |
| 1726 | break; |
| 1727 | |
| 1728 | case _PC_LINK_MAX: |
| 1729 | *retval = LINK_MAX; |
| 1730 | break; |
| 1731 | |
| 1732 | case _PC_NAME_MAX: |
| 1733 | *retval = NAME_MAX; |
| 1734 | break; |
| 1735 | |
| 1736 | case _PC_NO_TRUNC: |
| 1737 | *retval = 1; |
| 1738 | break; |
| 1739 | |
| 1740 | case _PC_PATH_MAX: |
| 1741 | *retval = PATH_MAX; |
| 1742 | break; |
| 1743 | |
| 1744 | case _PC_PIPE_BUF: |
| 1745 | *retval = PIPE_BUF; |
| 1746 | break; |
| 1747 | |
| 1748 | case _PC_SYNC_IO: |
| 1749 | *retval = 1; |
| 1750 | break; |
| 1751 | |
| 1752 | default: |
| 1753 | error = EINVAL; |
| 1754 | } |
| 1755 | |
| 1756 | return error; |
| 1757 | } |
| 1758 | |
| 1759 | /************************************************************************ |
| 1760 | * KQFILTER OPS * |
| 1761 | ************************************************************************/ |
| 1762 | |
| 1763 | static void filt_tmpfsdetach(struct knote *kn); |
| 1764 | static int filt_tmpfsread(struct knote *kn, long hint); |
| 1765 | static int filt_tmpfswrite(struct knote *kn, long hint); |
| 1766 | static int filt_tmpfsvnode(struct knote *kn, long hint); |
| 1767 | |
| 1768 | static struct filterops tmpfsread_filtops = |
| 1769 | { FILTEROP_ISFD | FILTEROP_MPSAFE, |
| 1770 | NULL, filt_tmpfsdetach, filt_tmpfsread }; |
| 1771 | static struct filterops tmpfswrite_filtops = |
| 1772 | { FILTEROP_ISFD | FILTEROP_MPSAFE, |
| 1773 | NULL, filt_tmpfsdetach, filt_tmpfswrite }; |
| 1774 | static struct filterops tmpfsvnode_filtops = |
| 1775 | { FILTEROP_ISFD | FILTEROP_MPSAFE, |
| 1776 | NULL, filt_tmpfsdetach, filt_tmpfsvnode }; |
| 1777 | |
| 1778 | static int |
| 1779 | tmpfs_kqfilter (struct vop_kqfilter_args *ap) |
| 1780 | { |
| 1781 | struct vnode *vp = ap->a_vp; |
| 1782 | struct knote *kn = ap->a_kn; |
| 1783 | |
| 1784 | switch (kn->kn_filter) { |
| 1785 | case EVFILT_READ: |
| 1786 | kn->kn_fop = &tmpfsread_filtops; |
| 1787 | break; |
| 1788 | case EVFILT_WRITE: |
| 1789 | kn->kn_fop = &tmpfswrite_filtops; |
| 1790 | break; |
| 1791 | case EVFILT_VNODE: |
| 1792 | kn->kn_fop = &tmpfsvnode_filtops; |
| 1793 | break; |
| 1794 | default: |
| 1795 | return (EOPNOTSUPP); |
| 1796 | } |
| 1797 | |
| 1798 | kn->kn_hook = (caddr_t)vp; |
| 1799 | |
| 1800 | knote_insert(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); |
| 1801 | |
| 1802 | return(0); |
| 1803 | } |
| 1804 | |
| 1805 | static void |
| 1806 | filt_tmpfsdetach(struct knote *kn) |
| 1807 | { |
| 1808 | struct vnode *vp = (void *)kn->kn_hook; |
| 1809 | |
| 1810 | knote_remove(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); |
| 1811 | } |
| 1812 | |
| 1813 | static int |
| 1814 | filt_tmpfsread(struct knote *kn, long hint) |
| 1815 | { |
| 1816 | struct vnode *vp = (void *)kn->kn_hook; |
| 1817 | struct tmpfs_node *node = VP_TO_TMPFS_NODE(vp); |
| 1818 | off_t off; |
| 1819 | |
| 1820 | if (hint == NOTE_REVOKE) { |
| 1821 | kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); |
| 1822 | return(1); |
| 1823 | } |
| 1824 | |
| 1825 | /* |
| 1826 | * Interlock against MP races when performing this function. |
| 1827 | */ |
| 1828 | TMPFS_NODE_LOCK_SH(node); |
| 1829 | off = node->tn_size - kn->kn_fp->f_offset; |
| 1830 | kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX; |
| 1831 | if (kn->kn_sfflags & NOTE_OLDAPI) { |
| 1832 | TMPFS_NODE_UNLOCK(node); |
| 1833 | return(1); |
| 1834 | } |
| 1835 | if (kn->kn_data == 0) { |
| 1836 | kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX; |
| 1837 | } |
| 1838 | TMPFS_NODE_UNLOCK(node); |
| 1839 | return (kn->kn_data != 0); |
| 1840 | } |
| 1841 | |
| 1842 | static int |
| 1843 | filt_tmpfswrite(struct knote *kn, long hint) |
| 1844 | { |
| 1845 | if (hint == NOTE_REVOKE) |
| 1846 | kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); |
| 1847 | kn->kn_data = 0; |
| 1848 | return (1); |
| 1849 | } |
| 1850 | |
| 1851 | static int |
| 1852 | filt_tmpfsvnode(struct knote *kn, long hint) |
| 1853 | { |
| 1854 | if (kn->kn_sfflags & hint) |
| 1855 | kn->kn_fflags |= hint; |
| 1856 | if (hint == NOTE_REVOKE) { |
| 1857 | kn->kn_flags |= (EV_EOF | EV_NODATA); |
| 1858 | return (1); |
| 1859 | } |
| 1860 | return (kn->kn_fflags != 0); |
| 1861 | } |
| 1862 | |
| 1863 | |
| 1864 | /* --------------------------------------------------------------------- */ |
| 1865 | |
| 1866 | /* |
| 1867 | * vnode operations vector used for files stored in a tmpfs file system. |
| 1868 | */ |
| 1869 | struct vop_ops tmpfs_vnode_vops = { |
| 1870 | .vop_default = vop_defaultop, |
| 1871 | .vop_getpages = vop_stdgetpages, |
| 1872 | .vop_putpages = vop_stdputpages, |
| 1873 | .vop_ncreate = tmpfs_ncreate, |
| 1874 | .vop_nresolve = tmpfs_nresolve, |
| 1875 | .vop_nlookupdotdot = tmpfs_nlookupdotdot, |
| 1876 | .vop_nmknod = tmpfs_nmknod, |
| 1877 | .vop_open = tmpfs_open, |
| 1878 | .vop_close = tmpfs_close, |
| 1879 | .vop_access = tmpfs_access, |
| 1880 | .vop_getattr = tmpfs_getattr, |
| 1881 | .vop_setattr = tmpfs_setattr, |
| 1882 | .vop_read = tmpfs_read, |
| 1883 | .vop_write = tmpfs_write, |
| 1884 | .vop_fsync = tmpfs_fsync, |
| 1885 | .vop_mountctl = tmpfs_mountctl, |
| 1886 | .vop_nremove = tmpfs_nremove, |
| 1887 | .vop_nlink = tmpfs_nlink, |
| 1888 | .vop_nrename = tmpfs_nrename, |
| 1889 | .vop_nmkdir = tmpfs_nmkdir, |
| 1890 | .vop_nrmdir = tmpfs_nrmdir, |
| 1891 | .vop_nsymlink = tmpfs_nsymlink, |
| 1892 | .vop_readdir = tmpfs_readdir, |
| 1893 | .vop_readlink = tmpfs_readlink, |
| 1894 | .vop_inactive = tmpfs_inactive, |
| 1895 | .vop_reclaim = tmpfs_reclaim, |
| 1896 | .vop_print = tmpfs_print, |
| 1897 | .vop_pathconf = tmpfs_pathconf, |
| 1898 | .vop_bmap = tmpfs_bmap, |
| 1899 | .vop_strategy = tmpfs_strategy, |
| 1900 | .vop_advlock = tmpfs_advlock, |
| 1901 | .vop_kqfilter = tmpfs_kqfilter |
| 1902 | }; |