| 1 | /* |
| 2 | * Copyright (c) 1989, 1993 |
| 3 | * The Regents of the University of California. All rights reserved. |
| 4 | * (c) UNIX System Laboratories, Inc. |
| 5 | * All or some portions of this file are derived from material licensed |
| 6 | * to the University of California by American Telephone and Telegraph |
| 7 | * Co. or Unix System Laboratories, Inc. and are reproduced herein with |
| 8 | * the permission of UNIX System Laboratories, Inc. |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or without |
| 11 | * modification, are permitted provided that the following conditions |
| 12 | * are met: |
| 13 | * 1. Redistributions of source code must retain the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer. |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in the |
| 17 | * documentation and/or other materials provided with the distribution. |
| 18 | * 3. All advertising materials mentioning features or use of this software |
| 19 | * must display the following acknowledgement: |
| 20 | * This product includes software developed by the University of |
| 21 | * California, Berkeley and its contributors. |
| 22 | * 4. Neither the name of the University nor the names of its contributors |
| 23 | * may be used to endorse or promote products derived from this software |
| 24 | * without specific prior written permission. |
| 25 | * |
| 26 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 27 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 28 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 29 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 30 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 31 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 32 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 33 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 34 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 35 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 36 | * SUCH DAMAGE. |
| 37 | * |
| 38 | * @(#)vfs_subr.c 8.31 (Berkeley) 5/26/95 |
| 39 | * $FreeBSD: src/sys/kern/vfs_subr.c,v 1.249.2.30 2003/04/04 20:35:57 tegge Exp $ |
| 40 | * $DragonFly: src/sys/kern/vfs_subr.c,v 1.15 2003/07/26 19:42:11 rob Exp $ |
| 41 | */ |
| 42 | |
| 43 | /* |
| 44 | * External virtual filesystem routines |
| 45 | */ |
| 46 | #include "opt_ddb.h" |
| 47 | |
| 48 | #include <sys/param.h> |
| 49 | #include <sys/systm.h> |
| 50 | #include <sys/buf.h> |
| 51 | #include <sys/conf.h> |
| 52 | #include <sys/dirent.h> |
| 53 | #include <sys/domain.h> |
| 54 | #include <sys/eventhandler.h> |
| 55 | #include <sys/fcntl.h> |
| 56 | #include <sys/kernel.h> |
| 57 | #include <sys/kthread.h> |
| 58 | #include <sys/malloc.h> |
| 59 | #include <sys/mbuf.h> |
| 60 | #include <sys/mount.h> |
| 61 | #include <sys/proc.h> |
| 62 | #include <sys/namei.h> |
| 63 | #include <sys/reboot.h> |
| 64 | #include <sys/socket.h> |
| 65 | #include <sys/stat.h> |
| 66 | #include <sys/sysctl.h> |
| 67 | #include <sys/syslog.h> |
| 68 | #include <sys/vmmeter.h> |
| 69 | #include <sys/vnode.h> |
| 70 | |
| 71 | #include <machine/limits.h> |
| 72 | |
| 73 | #include <vm/vm.h> |
| 74 | #include <vm/vm_object.h> |
| 75 | #include <vm/vm_extern.h> |
| 76 | #include <vm/pmap.h> |
| 77 | #include <vm/vm_map.h> |
| 78 | #include <vm/vm_page.h> |
| 79 | #include <vm/vm_pager.h> |
| 80 | #include <vm/vnode_pager.h> |
| 81 | #include <vm/vm_zone.h> |
| 82 | |
| 83 | #include <sys/buf2.h> |
| 84 | #include <sys/thread2.h> |
| 85 | |
| 86 | static MALLOC_DEFINE(M_NETADDR, "Export Host", "Export host address structure"); |
| 87 | |
| 88 | static void insmntque __P((struct vnode *vp, struct mount *mp)); |
| 89 | static void vclean __P((struct vnode *vp, int flags, struct thread *td)); |
| 90 | static unsigned long numvnodes; |
| 91 | static void vlruvp(struct vnode *vp); |
| 92 | SYSCTL_INT(_debug, OID_AUTO, numvnodes, CTLFLAG_RD, &numvnodes, 0, ""); |
| 93 | |
| 94 | enum vtype iftovt_tab[16] = { |
| 95 | VNON, VFIFO, VCHR, VNON, VDIR, VNON, VBLK, VNON, |
| 96 | VREG, VNON, VLNK, VNON, VSOCK, VNON, VNON, VBAD, |
| 97 | }; |
| 98 | int vttoif_tab[9] = { |
| 99 | 0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK, |
| 100 | S_IFSOCK, S_IFIFO, S_IFMT, |
| 101 | }; |
| 102 | |
| 103 | static TAILQ_HEAD(freelst, vnode) vnode_free_list; /* vnode free list */ |
| 104 | |
| 105 | static u_long wantfreevnodes = 25; |
| 106 | SYSCTL_INT(_debug, OID_AUTO, wantfreevnodes, CTLFLAG_RW, &wantfreevnodes, 0, ""); |
| 107 | static u_long freevnodes = 0; |
| 108 | SYSCTL_INT(_debug, OID_AUTO, freevnodes, CTLFLAG_RD, &freevnodes, 0, ""); |
| 109 | |
| 110 | static int reassignbufcalls; |
| 111 | SYSCTL_INT(_vfs, OID_AUTO, reassignbufcalls, CTLFLAG_RW, &reassignbufcalls, 0, ""); |
| 112 | static int reassignbufloops; |
| 113 | SYSCTL_INT(_vfs, OID_AUTO, reassignbufloops, CTLFLAG_RW, &reassignbufloops, 0, ""); |
| 114 | static int reassignbufsortgood; |
| 115 | SYSCTL_INT(_vfs, OID_AUTO, reassignbufsortgood, CTLFLAG_RW, &reassignbufsortgood, 0, ""); |
| 116 | static int reassignbufsortbad; |
| 117 | SYSCTL_INT(_vfs, OID_AUTO, reassignbufsortbad, CTLFLAG_RW, &reassignbufsortbad, 0, ""); |
| 118 | static int reassignbufmethod = 1; |
| 119 | SYSCTL_INT(_vfs, OID_AUTO, reassignbufmethod, CTLFLAG_RW, &reassignbufmethod, 0, ""); |
| 120 | static int nameileafonly = 0; |
| 121 | SYSCTL_INT(_vfs, OID_AUTO, nameileafonly, CTLFLAG_RW, &nameileafonly, 0, ""); |
| 122 | |
| 123 | #ifdef ENABLE_VFS_IOOPT |
| 124 | int vfs_ioopt = 0; |
| 125 | SYSCTL_INT(_vfs, OID_AUTO, ioopt, CTLFLAG_RW, &vfs_ioopt, 0, ""); |
| 126 | #endif |
| 127 | |
| 128 | struct mntlist mountlist = TAILQ_HEAD_INITIALIZER(mountlist); /* mounted fs */ |
| 129 | struct lwkt_token mountlist_token; |
| 130 | struct lwkt_token mntvnode_token; |
| 131 | int nfs_mount_type = -1; |
| 132 | static struct lwkt_token mntid_token; |
| 133 | static struct lwkt_token vnode_free_list_token; |
| 134 | static struct lwkt_token spechash_token; |
| 135 | struct nfs_public nfs_pub; /* publicly exported FS */ |
| 136 | static vm_zone_t vnode_zone; |
| 137 | |
| 138 | /* |
| 139 | * The workitem queue. |
| 140 | */ |
| 141 | #define SYNCER_MAXDELAY 32 |
| 142 | static int syncer_maxdelay = SYNCER_MAXDELAY; /* maximum delay time */ |
| 143 | time_t syncdelay = 30; /* max time to delay syncing data */ |
| 144 | time_t filedelay = 30; /* time to delay syncing files */ |
| 145 | SYSCTL_INT(_kern, OID_AUTO, filedelay, CTLFLAG_RW, &filedelay, 0, ""); |
| 146 | time_t dirdelay = 29; /* time to delay syncing directories */ |
| 147 | SYSCTL_INT(_kern, OID_AUTO, dirdelay, CTLFLAG_RW, &dirdelay, 0, ""); |
| 148 | time_t metadelay = 28; /* time to delay syncing metadata */ |
| 149 | SYSCTL_INT(_kern, OID_AUTO, metadelay, CTLFLAG_RW, &metadelay, 0, ""); |
| 150 | static int rushjob; /* number of slots to run ASAP */ |
| 151 | static int stat_rush_requests; /* number of times I/O speeded up */ |
| 152 | SYSCTL_INT(_debug, OID_AUTO, rush_requests, CTLFLAG_RW, &stat_rush_requests, 0, ""); |
| 153 | |
| 154 | static int syncer_delayno = 0; |
| 155 | static long syncer_mask; |
| 156 | LIST_HEAD(synclist, vnode); |
| 157 | static struct synclist *syncer_workitem_pending; |
| 158 | |
| 159 | int desiredvnodes; |
| 160 | SYSCTL_INT(_kern, KERN_MAXVNODES, maxvnodes, CTLFLAG_RW, |
| 161 | &desiredvnodes, 0, "Maximum number of vnodes"); |
| 162 | static int minvnodes; |
| 163 | SYSCTL_INT(_kern, OID_AUTO, minvnodes, CTLFLAG_RW, |
| 164 | &minvnodes, 0, "Minimum number of vnodes"); |
| 165 | static int vnlru_nowhere = 0; |
| 166 | SYSCTL_INT(_debug, OID_AUTO, vnlru_nowhere, CTLFLAG_RW, &vnlru_nowhere, 0, |
| 167 | "Number of times the vnlru process ran without success"); |
| 168 | |
| 169 | static void vfs_free_addrlist __P((struct netexport *nep)); |
| 170 | static int vfs_free_netcred __P((struct radix_node *rn, void *w)); |
| 171 | static int vfs_hang_addrlist __P((struct mount *mp, struct netexport *nep, |
| 172 | struct export_args *argp)); |
| 173 | |
| 174 | /* |
| 175 | * Initialize the vnode management data structures. |
| 176 | */ |
| 177 | void |
| 178 | vntblinit() |
| 179 | { |
| 180 | |
| 181 | desiredvnodes = maxproc + vmstats.v_page_count / 4; |
| 182 | minvnodes = desiredvnodes / 4; |
| 183 | lwkt_inittoken(&mntvnode_token); |
| 184 | lwkt_inittoken(&mntid_token); |
| 185 | lwkt_inittoken(&spechash_token); |
| 186 | TAILQ_INIT(&vnode_free_list); |
| 187 | lwkt_inittoken(&vnode_free_list_token); |
| 188 | vnode_zone = zinit("VNODE", sizeof (struct vnode), 0, 0, 5); |
| 189 | /* |
| 190 | * Initialize the filesystem syncer. |
| 191 | */ |
| 192 | syncer_workitem_pending = hashinit(syncer_maxdelay, M_VNODE, |
| 193 | &syncer_mask); |
| 194 | syncer_maxdelay = syncer_mask + 1; |
| 195 | } |
| 196 | |
| 197 | /* |
| 198 | * Mark a mount point as busy. Used to synchronize access and to delay |
| 199 | * unmounting. Interlock is not released on failure. |
| 200 | */ |
| 201 | int |
| 202 | vfs_busy(struct mount *mp, int flags, struct lwkt_token *interlkp, |
| 203 | struct thread *td) |
| 204 | { |
| 205 | int lkflags; |
| 206 | |
| 207 | if (mp->mnt_kern_flag & MNTK_UNMOUNT) { |
| 208 | if (flags & LK_NOWAIT) |
| 209 | return (ENOENT); |
| 210 | mp->mnt_kern_flag |= MNTK_MWAIT; |
| 211 | if (interlkp) { |
| 212 | lwkt_reltoken(interlkp); |
| 213 | } |
| 214 | /* |
| 215 | * Since all busy locks are shared except the exclusive |
| 216 | * lock granted when unmounting, the only place that a |
| 217 | * wakeup needs to be done is at the release of the |
| 218 | * exclusive lock at the end of dounmount. |
| 219 | */ |
| 220 | tsleep((caddr_t)mp, 0, "vfs_busy", 0); |
| 221 | if (interlkp) { |
| 222 | lwkt_gettoken(interlkp); |
| 223 | } |
| 224 | return (ENOENT); |
| 225 | } |
| 226 | lkflags = LK_SHARED | LK_NOPAUSE; |
| 227 | if (interlkp) |
| 228 | lkflags |= LK_INTERLOCK; |
| 229 | if (lockmgr(&mp->mnt_lock, lkflags, interlkp, td)) |
| 230 | panic("vfs_busy: unexpected lock failure"); |
| 231 | return (0); |
| 232 | } |
| 233 | |
| 234 | /* |
| 235 | * Free a busy filesystem. |
| 236 | */ |
| 237 | void |
| 238 | vfs_unbusy(struct mount *mp, struct thread *td) |
| 239 | { |
| 240 | lockmgr(&mp->mnt_lock, LK_RELEASE, NULL, td); |
| 241 | } |
| 242 | |
| 243 | /* |
| 244 | * Lookup a filesystem type, and if found allocate and initialize |
| 245 | * a mount structure for it. |
| 246 | * |
| 247 | * Devname is usually updated by mount(8) after booting. |
| 248 | */ |
| 249 | int |
| 250 | vfs_rootmountalloc(char *fstypename, char *devname, struct mount **mpp) |
| 251 | { |
| 252 | struct thread *td = curthread; /* XXX */ |
| 253 | struct vfsconf *vfsp; |
| 254 | struct mount *mp; |
| 255 | |
| 256 | if (fstypename == NULL) |
| 257 | return (ENODEV); |
| 258 | for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) |
| 259 | if (!strcmp(vfsp->vfc_name, fstypename)) |
| 260 | break; |
| 261 | if (vfsp == NULL) |
| 262 | return (ENODEV); |
| 263 | mp = malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK); |
| 264 | bzero((char *)mp, (u_long)sizeof(struct mount)); |
| 265 | lockinit(&mp->mnt_lock, 0, "vfslock", VLKTIMEOUT, LK_NOPAUSE); |
| 266 | (void)vfs_busy(mp, LK_NOWAIT, 0, td); |
| 267 | TAILQ_INIT(&mp->mnt_nvnodelist); |
| 268 | TAILQ_INIT(&mp->mnt_reservedvnlist); |
| 269 | mp->mnt_nvnodelistsize = 0; |
| 270 | mp->mnt_vfc = vfsp; |
| 271 | mp->mnt_op = vfsp->vfc_vfsops; |
| 272 | mp->mnt_flag = MNT_RDONLY; |
| 273 | mp->mnt_vnodecovered = NULLVP; |
| 274 | vfsp->vfc_refcount++; |
| 275 | mp->mnt_iosize_max = DFLTPHYS; |
| 276 | mp->mnt_stat.f_type = vfsp->vfc_typenum; |
| 277 | mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK; |
| 278 | strncpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); |
| 279 | mp->mnt_stat.f_mntonname[0] = '/'; |
| 280 | mp->mnt_stat.f_mntonname[1] = 0; |
| 281 | (void) copystr(devname, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 0); |
| 282 | *mpp = mp; |
| 283 | return (0); |
| 284 | } |
| 285 | |
| 286 | /* |
| 287 | * Find an appropriate filesystem to use for the root. If a filesystem |
| 288 | * has not been preselected, walk through the list of known filesystems |
| 289 | * trying those that have mountroot routines, and try them until one |
| 290 | * works or we have tried them all. |
| 291 | */ |
| 292 | #ifdef notdef /* XXX JH */ |
| 293 | int |
| 294 | lite2_vfs_mountroot() |
| 295 | { |
| 296 | struct vfsconf *vfsp; |
| 297 | extern int (*lite2_mountroot) __P((void)); |
| 298 | int error; |
| 299 | |
| 300 | if (lite2_mountroot != NULL) |
| 301 | return ((*lite2_mountroot)()); |
| 302 | for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) { |
| 303 | if (vfsp->vfc_mountroot == NULL) |
| 304 | continue; |
| 305 | if ((error = (*vfsp->vfc_mountroot)()) == 0) |
| 306 | return (0); |
| 307 | printf("%s_mountroot failed: %d\n", vfsp->vfc_name, error); |
| 308 | } |
| 309 | return (ENODEV); |
| 310 | } |
| 311 | #endif |
| 312 | |
| 313 | /* |
| 314 | * Lookup a mount point by filesystem identifier. |
| 315 | */ |
| 316 | struct mount * |
| 317 | vfs_getvfs(fsid) |
| 318 | fsid_t *fsid; |
| 319 | { |
| 320 | struct mount *mp; |
| 321 | |
| 322 | lwkt_gettoken(&mountlist_token); |
| 323 | TAILQ_FOREACH(mp, &mountlist, mnt_list) { |
| 324 | if (mp->mnt_stat.f_fsid.val[0] == fsid->val[0] && |
| 325 | mp->mnt_stat.f_fsid.val[1] == fsid->val[1]) { |
| 326 | lwkt_reltoken(&mountlist_token); |
| 327 | return (mp); |
| 328 | } |
| 329 | } |
| 330 | lwkt_reltoken(&mountlist_token); |
| 331 | return ((struct mount *) 0); |
| 332 | } |
| 333 | |
| 334 | /* |
| 335 | * Get a new unique fsid. Try to make its val[0] unique, since this value |
| 336 | * will be used to create fake device numbers for stat(). Also try (but |
| 337 | * not so hard) make its val[0] unique mod 2^16, since some emulators only |
| 338 | * support 16-bit device numbers. We end up with unique val[0]'s for the |
| 339 | * first 2^16 calls and unique val[0]'s mod 2^16 for the first 2^8 calls. |
| 340 | * |
| 341 | * Keep in mind that several mounts may be running in parallel. Starting |
| 342 | * the search one past where the previous search terminated is both a |
| 343 | * micro-optimization and a defense against returning the same fsid to |
| 344 | * different mounts. |
| 345 | */ |
| 346 | void |
| 347 | vfs_getnewfsid(mp) |
| 348 | struct mount *mp; |
| 349 | { |
| 350 | static u_int16_t mntid_base; |
| 351 | fsid_t tfsid; |
| 352 | int mtype; |
| 353 | |
| 354 | lwkt_gettoken(&mntid_token); |
| 355 | mtype = mp->mnt_vfc->vfc_typenum; |
| 356 | tfsid.val[1] = mtype; |
| 357 | mtype = (mtype & 0xFF) << 24; |
| 358 | for (;;) { |
| 359 | tfsid.val[0] = makeudev(255, |
| 360 | mtype | ((mntid_base & 0xFF00) << 8) | (mntid_base & 0xFF)); |
| 361 | mntid_base++; |
| 362 | if (vfs_getvfs(&tfsid) == NULL) |
| 363 | break; |
| 364 | } |
| 365 | mp->mnt_stat.f_fsid.val[0] = tfsid.val[0]; |
| 366 | mp->mnt_stat.f_fsid.val[1] = tfsid.val[1]; |
| 367 | lwkt_reltoken(&mntid_token); |
| 368 | } |
| 369 | |
| 370 | /* |
| 371 | * Knob to control the precision of file timestamps: |
| 372 | * |
| 373 | * 0 = seconds only; nanoseconds zeroed. |
| 374 | * 1 = seconds and nanoseconds, accurate within 1/HZ. |
| 375 | * 2 = seconds and nanoseconds, truncated to microseconds. |
| 376 | * >=3 = seconds and nanoseconds, maximum precision. |
| 377 | */ |
| 378 | enum { TSP_SEC, TSP_HZ, TSP_USEC, TSP_NSEC }; |
| 379 | |
| 380 | static int timestamp_precision = TSP_SEC; |
| 381 | SYSCTL_INT(_vfs, OID_AUTO, timestamp_precision, CTLFLAG_RW, |
| 382 | ×tamp_precision, 0, ""); |
| 383 | |
| 384 | /* |
| 385 | * Get a current timestamp. |
| 386 | */ |
| 387 | void |
| 388 | vfs_timestamp(tsp) |
| 389 | struct timespec *tsp; |
| 390 | { |
| 391 | struct timeval tv; |
| 392 | |
| 393 | switch (timestamp_precision) { |
| 394 | case TSP_SEC: |
| 395 | tsp->tv_sec = time_second; |
| 396 | tsp->tv_nsec = 0; |
| 397 | break; |
| 398 | case TSP_HZ: |
| 399 | getnanotime(tsp); |
| 400 | break; |
| 401 | case TSP_USEC: |
| 402 | microtime(&tv); |
| 403 | TIMEVAL_TO_TIMESPEC(&tv, tsp); |
| 404 | break; |
| 405 | case TSP_NSEC: |
| 406 | default: |
| 407 | nanotime(tsp); |
| 408 | break; |
| 409 | } |
| 410 | } |
| 411 | |
| 412 | /* |
| 413 | * Set vnode attributes to VNOVAL |
| 414 | */ |
| 415 | void |
| 416 | vattr_null(vap) |
| 417 | struct vattr *vap; |
| 418 | { |
| 419 | |
| 420 | vap->va_type = VNON; |
| 421 | vap->va_size = VNOVAL; |
| 422 | vap->va_bytes = VNOVAL; |
| 423 | vap->va_mode = VNOVAL; |
| 424 | vap->va_nlink = VNOVAL; |
| 425 | vap->va_uid = VNOVAL; |
| 426 | vap->va_gid = VNOVAL; |
| 427 | vap->va_fsid = VNOVAL; |
| 428 | vap->va_fileid = VNOVAL; |
| 429 | vap->va_blocksize = VNOVAL; |
| 430 | vap->va_rdev = VNOVAL; |
| 431 | vap->va_atime.tv_sec = VNOVAL; |
| 432 | vap->va_atime.tv_nsec = VNOVAL; |
| 433 | vap->va_mtime.tv_sec = VNOVAL; |
| 434 | vap->va_mtime.tv_nsec = VNOVAL; |
| 435 | vap->va_ctime.tv_sec = VNOVAL; |
| 436 | vap->va_ctime.tv_nsec = VNOVAL; |
| 437 | vap->va_flags = VNOVAL; |
| 438 | vap->va_gen = VNOVAL; |
| 439 | vap->va_vaflags = 0; |
| 440 | } |
| 441 | |
| 442 | /* |
| 443 | * This routine is called when we have too many vnodes. It attempts |
| 444 | * to free <count> vnodes and will potentially free vnodes that still |
| 445 | * have VM backing store (VM backing store is typically the cause |
| 446 | * of a vnode blowout so we want to do this). Therefore, this operation |
| 447 | * is not considered cheap. |
| 448 | * |
| 449 | * A number of conditions may prevent a vnode from being reclaimed. |
| 450 | * the buffer cache may have references on the vnode, a directory |
| 451 | * vnode may still have references due to the namei cache representing |
| 452 | * underlying files, or the vnode may be in active use. It is not |
| 453 | * desireable to reuse such vnodes. These conditions may cause the |
| 454 | * number of vnodes to reach some minimum value regardless of what |
| 455 | * you set kern.maxvnodes to. Do not set kern.maxvnodes too low. |
| 456 | */ |
| 457 | static int |
| 458 | vlrureclaim(struct mount *mp) |
| 459 | { |
| 460 | struct vnode *vp; |
| 461 | int done; |
| 462 | int trigger; |
| 463 | int usevnodes; |
| 464 | int count; |
| 465 | int gen; |
| 466 | |
| 467 | /* |
| 468 | * Calculate the trigger point, don't allow user |
| 469 | * screwups to blow us up. This prevents us from |
| 470 | * recycling vnodes with lots of resident pages. We |
| 471 | * aren't trying to free memory, we are trying to |
| 472 | * free vnodes. |
| 473 | */ |
| 474 | usevnodes = desiredvnodes; |
| 475 | if (usevnodes <= 0) |
| 476 | usevnodes = 1; |
| 477 | trigger = vmstats.v_page_count * 2 / usevnodes; |
| 478 | |
| 479 | done = 0; |
| 480 | gen = lwkt_gettoken(&mntvnode_token); |
| 481 | count = mp->mnt_nvnodelistsize / 10 + 1; |
| 482 | while (count && (vp = TAILQ_FIRST(&mp->mnt_nvnodelist)) != NULL) { |
| 483 | TAILQ_REMOVE(&mp->mnt_nvnodelist, vp, v_nmntvnodes); |
| 484 | TAILQ_INSERT_TAIL(&mp->mnt_nvnodelist, vp, v_nmntvnodes); |
| 485 | |
| 486 | if (vp->v_type != VNON && |
| 487 | vp->v_type != VBAD && |
| 488 | VMIGHTFREE(vp) && /* critical path opt */ |
| 489 | (vp->v_object == NULL || vp->v_object->resident_page_count < trigger) |
| 490 | ) { |
| 491 | lwkt_gettoken(&vp->v_interlock); |
| 492 | if (lwkt_gentoken(&mntvnode_token, &gen) == 0) { |
| 493 | if (VMIGHTFREE(vp)) { |
| 494 | vgonel(vp, curthread); |
| 495 | done++; |
| 496 | } else { |
| 497 | lwkt_reltoken(&vp->v_interlock); |
| 498 | } |
| 499 | } else { |
| 500 | lwkt_reltoken(&vp->v_interlock); |
| 501 | } |
| 502 | } |
| 503 | --count; |
| 504 | } |
| 505 | lwkt_reltoken(&mntvnode_token); |
| 506 | return done; |
| 507 | } |
| 508 | |
| 509 | /* |
| 510 | * Attempt to recycle vnodes in a context that is always safe to block. |
| 511 | * Calling vlrurecycle() from the bowels of file system code has some |
| 512 | * interesting deadlock problems. |
| 513 | */ |
| 514 | static struct thread *vnlruthread; |
| 515 | static int vnlruproc_sig; |
| 516 | |
| 517 | static void |
| 518 | vnlru_proc(void) |
| 519 | { |
| 520 | struct mount *mp, *nmp; |
| 521 | int s; |
| 522 | int done; |
| 523 | struct thread *td = curthread; |
| 524 | |
| 525 | EVENTHANDLER_REGISTER(shutdown_pre_sync, shutdown_kproc, td, |
| 526 | SHUTDOWN_PRI_FIRST); |
| 527 | |
| 528 | s = splbio(); |
| 529 | for (;;) { |
| 530 | kproc_suspend_loop(); |
| 531 | if (numvnodes - freevnodes <= desiredvnodes * 9 / 10) { |
| 532 | vnlruproc_sig = 0; |
| 533 | wakeup(&vnlruproc_sig); |
| 534 | tsleep(td, 0, "vlruwt", hz); |
| 535 | continue; |
| 536 | } |
| 537 | done = 0; |
| 538 | lwkt_gettoken(&mountlist_token); |
| 539 | for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { |
| 540 | if (vfs_busy(mp, LK_NOWAIT, &mountlist_token, td)) { |
| 541 | nmp = TAILQ_NEXT(mp, mnt_list); |
| 542 | continue; |
| 543 | } |
| 544 | done += vlrureclaim(mp); |
| 545 | lwkt_gettoken(&mountlist_token); |
| 546 | nmp = TAILQ_NEXT(mp, mnt_list); |
| 547 | vfs_unbusy(mp, td); |
| 548 | } |
| 549 | lwkt_reltoken(&mountlist_token); |
| 550 | if (done == 0) { |
| 551 | vnlru_nowhere++; |
| 552 | tsleep(td, 0, "vlrup", hz * 3); |
| 553 | } |
| 554 | } |
| 555 | splx(s); |
| 556 | } |
| 557 | |
| 558 | static struct kproc_desc vnlru_kp = { |
| 559 | "vnlru", |
| 560 | vnlru_proc, |
| 561 | &vnlruthread |
| 562 | }; |
| 563 | SYSINIT(vnlru, SI_SUB_KTHREAD_UPDATE, SI_ORDER_FIRST, kproc_start, &vnlru_kp) |
| 564 | |
| 565 | /* |
| 566 | * Routines having to do with the management of the vnode table. |
| 567 | */ |
| 568 | extern vop_t **dead_vnodeop_p; |
| 569 | |
| 570 | /* |
| 571 | * Return the next vnode from the free list. |
| 572 | */ |
| 573 | int |
| 574 | getnewvnode(tag, mp, vops, vpp) |
| 575 | enum vtagtype tag; |
| 576 | struct mount *mp; |
| 577 | vop_t **vops; |
| 578 | struct vnode **vpp; |
| 579 | { |
| 580 | int s; |
| 581 | int gen; |
| 582 | int vgen; |
| 583 | struct thread *td = curthread; /* XXX */ |
| 584 | struct vnode *vp = NULL; |
| 585 | vm_object_t object; |
| 586 | |
| 587 | s = splbio(); |
| 588 | |
| 589 | /* |
| 590 | * Try to reuse vnodes if we hit the max. This situation only |
| 591 | * occurs in certain large-memory (2G+) situations. We cannot |
| 592 | * attempt to directly reclaim vnodes due to nasty recursion |
| 593 | * problems. |
| 594 | */ |
| 595 | while (numvnodes - freevnodes > desiredvnodes) { |
| 596 | if (vnlruproc_sig == 0) { |
| 597 | vnlruproc_sig = 1; /* avoid unnecessary wakeups */ |
| 598 | wakeup(vnlruthread); |
| 599 | } |
| 600 | tsleep(&vnlruproc_sig, 0, "vlruwk", hz); |
| 601 | } |
| 602 | |
| 603 | |
| 604 | /* |
| 605 | * Attempt to reuse a vnode already on the free list, allocating |
| 606 | * a new vnode if we can't find one or if we have not reached a |
| 607 | * good minimum for good LRU performance. |
| 608 | */ |
| 609 | gen = lwkt_gettoken(&vnode_free_list_token); |
| 610 | if (freevnodes >= wantfreevnodes && numvnodes >= minvnodes) { |
| 611 | int count; |
| 612 | |
| 613 | for (count = 0; count < freevnodes; count++) { |
| 614 | vp = TAILQ_FIRST(&vnode_free_list); |
| 615 | if (vp == NULL || vp->v_usecount) |
| 616 | panic("getnewvnode: free vnode isn't"); |
| 617 | |
| 618 | /* |
| 619 | * Get the vnode's interlock, then re-obtain |
| 620 | * vnode_free_list_token in case we lost it. If we |
| 621 | * did lose it while getting the vnode interlock, |
| 622 | * even if we got it back again, then retry. |
| 623 | */ |
| 624 | vgen = lwkt_gettoken(&vp->v_interlock); |
| 625 | if (lwkt_gentoken(&vnode_free_list_token, &gen) != 0) { |
| 626 | --count; |
| 627 | lwkt_reltoken(&vp->v_interlock); |
| 628 | vp = NULL; |
| 629 | continue; |
| 630 | } |
| 631 | |
| 632 | /* |
| 633 | * Whew! We have both tokens. Since we didn't lose |
| 634 | * the free list VFREE had better still be set. But |
| 635 | * we aren't out of the woods yet. We have to get |
| 636 | * the object (may block). If the vnode is not |
| 637 | * suitable then move it to the end of the list |
| 638 | * if we can. If we can't move it to the end of the |
| 639 | * list retry again. |
| 640 | */ |
| 641 | if ((VOP_GETVOBJECT(vp, &object) == 0 && |
| 642 | (object->resident_page_count || object->ref_count)) |
| 643 | ) { |
| 644 | if (lwkt_gentoken(&vp->v_interlock, &vgen) == 0 && |
| 645 | lwkt_gentoken(&vnode_free_list_token, &gen) == 0 |
| 646 | ) { |
| 647 | TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); |
| 648 | TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist); |
| 649 | } else { |
| 650 | --count; |
| 651 | } |
| 652 | lwkt_reltoken(&vp->v_interlock); |
| 653 | vp = NULL; |
| 654 | continue; |
| 655 | } |
| 656 | |
| 657 | /* |
| 658 | * Still not out of the woods. VOBJECT might have |
| 659 | * blocked, if we did not retain our tokens we have |
| 660 | * to retry. |
| 661 | */ |
| 662 | if (lwkt_gentoken(&vp->v_interlock, &vgen) != 0 || |
| 663 | lwkt_gentoken(&vnode_free_list_token, &gen) != 0) { |
| 664 | --count; |
| 665 | vp = NULL; |
| 666 | continue; |
| 667 | } |
| 668 | TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); |
| 669 | KKASSERT(vp->v_flag & VFREE); |
| 670 | |
| 671 | if (LIST_FIRST(&vp->v_cache_src)) { |
| 672 | /* |
| 673 | * note: nameileafonly sysctl is temporary, |
| 674 | * for debugging only, and will eventually be |
| 675 | * removed. |
| 676 | */ |
| 677 | if (nameileafonly > 0) { |
| 678 | /* |
| 679 | * Do not reuse namei-cached directory |
| 680 | * vnodes that have cached |
| 681 | * subdirectories. |
| 682 | */ |
| 683 | if (cache_leaf_test(vp) < 0) { |
| 684 | lwkt_reltoken(&vp->v_interlock); |
| 685 | TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist); |
| 686 | vp = NULL; |
| 687 | continue; |
| 688 | } |
| 689 | } else if (nameileafonly < 0 || |
| 690 | vmiodirenable == 0) { |
| 691 | /* |
| 692 | * Do not reuse namei-cached directory |
| 693 | * vnodes if nameileafonly is -1 or |
| 694 | * if VMIO backing for directories is |
| 695 | * turned off (otherwise we reuse them |
| 696 | * too quickly). |
| 697 | */ |
| 698 | lwkt_reltoken(&vp->v_interlock); |
| 699 | TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist); |
| 700 | vp = NULL; |
| 701 | continue; |
| 702 | } |
| 703 | } |
| 704 | break; |
| 705 | } |
| 706 | } |
| 707 | |
| 708 | if (vp) { |
| 709 | vp->v_flag |= VDOOMED; |
| 710 | vp->v_flag &= ~VFREE; |
| 711 | freevnodes--; |
| 712 | lwkt_reltoken(&vnode_free_list_token); |
| 713 | cache_purge(vp); /* YYY may block */ |
| 714 | vp->v_lease = NULL; |
| 715 | if (vp->v_type != VBAD) { |
| 716 | vgonel(vp, td); |
| 717 | } else { |
| 718 | lwkt_reltoken(&vp->v_interlock); |
| 719 | } |
| 720 | |
| 721 | #ifdef INVARIANTS |
| 722 | { |
| 723 | int s; |
| 724 | |
| 725 | if (vp->v_data) |
| 726 | panic("cleaned vnode isn't"); |
| 727 | s = splbio(); |
| 728 | if (vp->v_numoutput) |
| 729 | panic("Clean vnode has pending I/O's"); |
| 730 | splx(s); |
| 731 | } |
| 732 | #endif |
| 733 | vp->v_flag = 0; |
| 734 | vp->v_lastw = 0; |
| 735 | vp->v_lasta = 0; |
| 736 | vp->v_cstart = 0; |
| 737 | vp->v_clen = 0; |
| 738 | vp->v_socket = 0; |
| 739 | vp->v_writecount = 0; /* XXX */ |
| 740 | } else { |
| 741 | lwkt_reltoken(&vnode_free_list_token); |
| 742 | vp = (struct vnode *) zalloc(vnode_zone); |
| 743 | bzero((char *) vp, sizeof *vp); |
| 744 | lwkt_inittoken(&vp->v_interlock); |
| 745 | vp->v_dd = vp; |
| 746 | cache_purge(vp); |
| 747 | LIST_INIT(&vp->v_cache_src); |
| 748 | TAILQ_INIT(&vp->v_cache_dst); |
| 749 | numvnodes++; |
| 750 | } |
| 751 | |
| 752 | TAILQ_INIT(&vp->v_cleanblkhd); |
| 753 | TAILQ_INIT(&vp->v_dirtyblkhd); |
| 754 | vp->v_type = VNON; |
| 755 | vp->v_tag = tag; |
| 756 | vp->v_op = vops; |
| 757 | insmntque(vp, mp); |
| 758 | *vpp = vp; |
| 759 | vp->v_usecount = 1; |
| 760 | vp->v_data = 0; |
| 761 | splx(s); |
| 762 | |
| 763 | vfs_object_create(vp, td); |
| 764 | return (0); |
| 765 | } |
| 766 | |
| 767 | /* |
| 768 | * Move a vnode from one mount queue to another. |
| 769 | */ |
| 770 | static void |
| 771 | insmntque(vp, mp) |
| 772 | struct vnode *vp; |
| 773 | struct mount *mp; |
| 774 | { |
| 775 | |
| 776 | lwkt_gettoken(&mntvnode_token); |
| 777 | /* |
| 778 | * Delete from old mount point vnode list, if on one. |
| 779 | */ |
| 780 | if (vp->v_mount != NULL) { |
| 781 | KASSERT(vp->v_mount->mnt_nvnodelistsize > 0, |
| 782 | ("bad mount point vnode list size")); |
| 783 | TAILQ_REMOVE(&vp->v_mount->mnt_nvnodelist, vp, v_nmntvnodes); |
| 784 | vp->v_mount->mnt_nvnodelistsize--; |
| 785 | } |
| 786 | /* |
| 787 | * Insert into list of vnodes for the new mount point, if available. |
| 788 | */ |
| 789 | if ((vp->v_mount = mp) == NULL) { |
| 790 | lwkt_reltoken(&mntvnode_token); |
| 791 | return; |
| 792 | } |
| 793 | TAILQ_INSERT_TAIL(&mp->mnt_nvnodelist, vp, v_nmntvnodes); |
| 794 | mp->mnt_nvnodelistsize++; |
| 795 | lwkt_reltoken(&mntvnode_token); |
| 796 | } |
| 797 | |
| 798 | /* |
| 799 | * Update outstanding I/O count and do wakeup if requested. |
| 800 | */ |
| 801 | void |
| 802 | vwakeup(bp) |
| 803 | struct buf *bp; |
| 804 | { |
| 805 | struct vnode *vp; |
| 806 | |
| 807 | bp->b_flags &= ~B_WRITEINPROG; |
| 808 | if ((vp = bp->b_vp)) { |
| 809 | vp->v_numoutput--; |
| 810 | if (vp->v_numoutput < 0) |
| 811 | panic("vwakeup: neg numoutput"); |
| 812 | if ((vp->v_numoutput == 0) && (vp->v_flag & VBWAIT)) { |
| 813 | vp->v_flag &= ~VBWAIT; |
| 814 | wakeup((caddr_t) &vp->v_numoutput); |
| 815 | } |
| 816 | } |
| 817 | } |
| 818 | |
| 819 | /* |
| 820 | * Flush out and invalidate all buffers associated with a vnode. |
| 821 | * Called with the underlying object locked. |
| 822 | */ |
| 823 | int |
| 824 | vinvalbuf(struct vnode *vp, int flags, struct thread *td, |
| 825 | int slpflag, int slptimeo) |
| 826 | { |
| 827 | struct buf *bp; |
| 828 | struct buf *nbp, *blist; |
| 829 | int s, error; |
| 830 | vm_object_t object; |
| 831 | |
| 832 | if (flags & V_SAVE) { |
| 833 | s = splbio(); |
| 834 | while (vp->v_numoutput) { |
| 835 | vp->v_flag |= VBWAIT; |
| 836 | error = tsleep((caddr_t)&vp->v_numoutput, |
| 837 | slpflag, "vinvlbuf", slptimeo); |
| 838 | if (error) { |
| 839 | splx(s); |
| 840 | return (error); |
| 841 | } |
| 842 | } |
| 843 | if (!TAILQ_EMPTY(&vp->v_dirtyblkhd)) { |
| 844 | splx(s); |
| 845 | if ((error = VOP_FSYNC(vp, MNT_WAIT, td)) != 0) |
| 846 | return (error); |
| 847 | s = splbio(); |
| 848 | if (vp->v_numoutput > 0 || |
| 849 | !TAILQ_EMPTY(&vp->v_dirtyblkhd)) |
| 850 | panic("vinvalbuf: dirty bufs"); |
| 851 | } |
| 852 | splx(s); |
| 853 | } |
| 854 | s = splbio(); |
| 855 | for (;;) { |
| 856 | blist = TAILQ_FIRST(&vp->v_cleanblkhd); |
| 857 | if (!blist) |
| 858 | blist = TAILQ_FIRST(&vp->v_dirtyblkhd); |
| 859 | if (!blist) |
| 860 | break; |
| 861 | |
| 862 | for (bp = blist; bp; bp = nbp) { |
| 863 | nbp = TAILQ_NEXT(bp, b_vnbufs); |
| 864 | if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) { |
| 865 | error = BUF_TIMELOCK(bp, |
| 866 | LK_EXCLUSIVE | LK_SLEEPFAIL, |
| 867 | "vinvalbuf", slpflag, slptimeo); |
| 868 | if (error == ENOLCK) |
| 869 | break; |
| 870 | splx(s); |
| 871 | return (error); |
| 872 | } |
| 873 | /* |
| 874 | * XXX Since there are no node locks for NFS, I |
| 875 | * believe there is a slight chance that a delayed |
| 876 | * write will occur while sleeping just above, so |
| 877 | * check for it. Note that vfs_bio_awrite expects |
| 878 | * buffers to reside on a queue, while VOP_BWRITE and |
| 879 | * brelse do not. |
| 880 | */ |
| 881 | if (((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI) && |
| 882 | (flags & V_SAVE)) { |
| 883 | |
| 884 | if (bp->b_vp == vp) { |
| 885 | if (bp->b_flags & B_CLUSTEROK) { |
| 886 | BUF_UNLOCK(bp); |
| 887 | vfs_bio_awrite(bp); |
| 888 | } else { |
| 889 | bremfree(bp); |
| 890 | bp->b_flags |= B_ASYNC; |
| 891 | VOP_BWRITE(bp->b_vp, bp); |
| 892 | } |
| 893 | } else { |
| 894 | bremfree(bp); |
| 895 | (void) VOP_BWRITE(bp->b_vp, bp); |
| 896 | } |
| 897 | break; |
| 898 | } |
| 899 | bremfree(bp); |
| 900 | bp->b_flags |= (B_INVAL | B_NOCACHE | B_RELBUF); |
| 901 | bp->b_flags &= ~B_ASYNC; |
| 902 | brelse(bp); |
| 903 | } |
| 904 | } |
| 905 | |
| 906 | /* |
| 907 | * Wait for I/O to complete. XXX needs cleaning up. The vnode can |
| 908 | * have write I/O in-progress but if there is a VM object then the |
| 909 | * VM object can also have read-I/O in-progress. |
| 910 | */ |
| 911 | do { |
| 912 | while (vp->v_numoutput > 0) { |
| 913 | vp->v_flag |= VBWAIT; |
| 914 | tsleep(&vp->v_numoutput, 0, "vnvlbv", 0); |
| 915 | } |
| 916 | if (VOP_GETVOBJECT(vp, &object) == 0) { |
| 917 | while (object->paging_in_progress) |
| 918 | vm_object_pip_sleep(object, "vnvlbx"); |
| 919 | } |
| 920 | } while (vp->v_numoutput > 0); |
| 921 | |
| 922 | splx(s); |
| 923 | |
| 924 | /* |
| 925 | * Destroy the copy in the VM cache, too. |
| 926 | */ |
| 927 | lwkt_gettoken(&vp->v_interlock); |
| 928 | if (VOP_GETVOBJECT(vp, &object) == 0) { |
| 929 | vm_object_page_remove(object, 0, 0, |
| 930 | (flags & V_SAVE) ? TRUE : FALSE); |
| 931 | } |
| 932 | lwkt_reltoken(&vp->v_interlock); |
| 933 | |
| 934 | if (!TAILQ_EMPTY(&vp->v_dirtyblkhd) || !TAILQ_EMPTY(&vp->v_cleanblkhd)) |
| 935 | panic("vinvalbuf: flush failed"); |
| 936 | return (0); |
| 937 | } |
| 938 | |
| 939 | /* |
| 940 | * Truncate a file's buffer and pages to a specified length. This |
| 941 | * is in lieu of the old vinvalbuf mechanism, which performed unneeded |
| 942 | * sync activity. |
| 943 | */ |
| 944 | int |
| 945 | vtruncbuf(struct vnode *vp, struct thread *td, off_t length, int blksize) |
| 946 | { |
| 947 | struct buf *bp; |
| 948 | struct buf *nbp; |
| 949 | int s, anyfreed; |
| 950 | int trunclbn; |
| 951 | |
| 952 | /* |
| 953 | * Round up to the *next* lbn. |
| 954 | */ |
| 955 | trunclbn = (length + blksize - 1) / blksize; |
| 956 | |
| 957 | s = splbio(); |
| 958 | restart: |
| 959 | anyfreed = 1; |
| 960 | for (;anyfreed;) { |
| 961 | anyfreed = 0; |
| 962 | for (bp = TAILQ_FIRST(&vp->v_cleanblkhd); bp; bp = nbp) { |
| 963 | nbp = TAILQ_NEXT(bp, b_vnbufs); |
| 964 | if (bp->b_lblkno >= trunclbn) { |
| 965 | if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) { |
| 966 | BUF_LOCK(bp, LK_EXCLUSIVE|LK_SLEEPFAIL); |
| 967 | goto restart; |
| 968 | } else { |
| 969 | bremfree(bp); |
| 970 | bp->b_flags |= (B_INVAL | B_RELBUF); |
| 971 | bp->b_flags &= ~B_ASYNC; |
| 972 | brelse(bp); |
| 973 | anyfreed = 1; |
| 974 | } |
| 975 | if (nbp && |
| 976 | (((nbp->b_xflags & BX_VNCLEAN) == 0) || |
| 977 | (nbp->b_vp != vp) || |
| 978 | (nbp->b_flags & B_DELWRI))) { |
| 979 | goto restart; |
| 980 | } |
| 981 | } |
| 982 | } |
| 983 | |
| 984 | for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { |
| 985 | nbp = TAILQ_NEXT(bp, b_vnbufs); |
| 986 | if (bp->b_lblkno >= trunclbn) { |
| 987 | if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) { |
| 988 | BUF_LOCK(bp, LK_EXCLUSIVE|LK_SLEEPFAIL); |
| 989 | goto restart; |
| 990 | } else { |
| 991 | bremfree(bp); |
| 992 | bp->b_flags |= (B_INVAL | B_RELBUF); |
| 993 | bp->b_flags &= ~B_ASYNC; |
| 994 | brelse(bp); |
| 995 | anyfreed = 1; |
| 996 | } |
| 997 | if (nbp && |
| 998 | (((nbp->b_xflags & BX_VNDIRTY) == 0) || |
| 999 | (nbp->b_vp != vp) || |
| 1000 | (nbp->b_flags & B_DELWRI) == 0)) { |
| 1001 | goto restart; |
| 1002 | } |
| 1003 | } |
| 1004 | } |
| 1005 | } |
| 1006 | |
| 1007 | if (length > 0) { |
| 1008 | restartsync: |
| 1009 | for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { |
| 1010 | nbp = TAILQ_NEXT(bp, b_vnbufs); |
| 1011 | if ((bp->b_flags & B_DELWRI) && (bp->b_lblkno < 0)) { |
| 1012 | if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) { |
| 1013 | BUF_LOCK(bp, LK_EXCLUSIVE|LK_SLEEPFAIL); |
| 1014 | goto restart; |
| 1015 | } else { |
| 1016 | bremfree(bp); |
| 1017 | if (bp->b_vp == vp) { |
| 1018 | bp->b_flags |= B_ASYNC; |
| 1019 | } else { |
| 1020 | bp->b_flags &= ~B_ASYNC; |
| 1021 | } |
| 1022 | VOP_BWRITE(bp->b_vp, bp); |
| 1023 | } |
| 1024 | goto restartsync; |
| 1025 | } |
| 1026 | |
| 1027 | } |
| 1028 | } |
| 1029 | |
| 1030 | while (vp->v_numoutput > 0) { |
| 1031 | vp->v_flag |= VBWAIT; |
| 1032 | tsleep(&vp->v_numoutput, 0, "vbtrunc", 0); |
| 1033 | } |
| 1034 | |
| 1035 | splx(s); |
| 1036 | |
| 1037 | vnode_pager_setsize(vp, length); |
| 1038 | |
| 1039 | return (0); |
| 1040 | } |
| 1041 | |
| 1042 | /* |
| 1043 | * Associate a buffer with a vnode. |
| 1044 | */ |
| 1045 | void |
| 1046 | bgetvp(vp, bp) |
| 1047 | struct vnode *vp; |
| 1048 | struct buf *bp; |
| 1049 | { |
| 1050 | int s; |
| 1051 | |
| 1052 | KASSERT(bp->b_vp == NULL, ("bgetvp: not free")); |
| 1053 | |
| 1054 | vhold(vp); |
| 1055 | bp->b_vp = vp; |
| 1056 | bp->b_dev = vn_todev(vp); |
| 1057 | /* |
| 1058 | * Insert onto list for new vnode. |
| 1059 | */ |
| 1060 | s = splbio(); |
| 1061 | bp->b_xflags |= BX_VNCLEAN; |
| 1062 | bp->b_xflags &= ~BX_VNDIRTY; |
| 1063 | TAILQ_INSERT_TAIL(&vp->v_cleanblkhd, bp, b_vnbufs); |
| 1064 | splx(s); |
| 1065 | } |
| 1066 | |
| 1067 | /* |
| 1068 | * Disassociate a buffer from a vnode. |
| 1069 | */ |
| 1070 | void |
| 1071 | brelvp(bp) |
| 1072 | struct buf *bp; |
| 1073 | { |
| 1074 | struct vnode *vp; |
| 1075 | struct buflists *listheadp; |
| 1076 | int s; |
| 1077 | |
| 1078 | KASSERT(bp->b_vp != NULL, ("brelvp: NULL")); |
| 1079 | |
| 1080 | /* |
| 1081 | * Delete from old vnode list, if on one. |
| 1082 | */ |
| 1083 | vp = bp->b_vp; |
| 1084 | s = splbio(); |
| 1085 | if (bp->b_xflags & (BX_VNDIRTY | BX_VNCLEAN)) { |
| 1086 | if (bp->b_xflags & BX_VNDIRTY) |
| 1087 | listheadp = &vp->v_dirtyblkhd; |
| 1088 | else |
| 1089 | listheadp = &vp->v_cleanblkhd; |
| 1090 | TAILQ_REMOVE(listheadp, bp, b_vnbufs); |
| 1091 | bp->b_xflags &= ~(BX_VNDIRTY | BX_VNCLEAN); |
| 1092 | } |
| 1093 | if ((vp->v_flag & VONWORKLST) && TAILQ_EMPTY(&vp->v_dirtyblkhd)) { |
| 1094 | vp->v_flag &= ~VONWORKLST; |
| 1095 | LIST_REMOVE(vp, v_synclist); |
| 1096 | } |
| 1097 | splx(s); |
| 1098 | bp->b_vp = (struct vnode *) 0; |
| 1099 | vdrop(vp); |
| 1100 | } |
| 1101 | |
| 1102 | /* |
| 1103 | * The workitem queue. |
| 1104 | * |
| 1105 | * It is useful to delay writes of file data and filesystem metadata |
| 1106 | * for tens of seconds so that quickly created and deleted files need |
| 1107 | * not waste disk bandwidth being created and removed. To realize this, |
| 1108 | * we append vnodes to a "workitem" queue. When running with a soft |
| 1109 | * updates implementation, most pending metadata dependencies should |
| 1110 | * not wait for more than a few seconds. Thus, mounted on block devices |
| 1111 | * are delayed only about a half the time that file data is delayed. |
| 1112 | * Similarly, directory updates are more critical, so are only delayed |
| 1113 | * about a third the time that file data is delayed. Thus, there are |
| 1114 | * SYNCER_MAXDELAY queues that are processed round-robin at a rate of |
| 1115 | * one each second (driven off the filesystem syncer process). The |
| 1116 | * syncer_delayno variable indicates the next queue that is to be processed. |
| 1117 | * Items that need to be processed soon are placed in this queue: |
| 1118 | * |
| 1119 | * syncer_workitem_pending[syncer_delayno] |
| 1120 | * |
| 1121 | * A delay of fifteen seconds is done by placing the request fifteen |
| 1122 | * entries later in the queue: |
| 1123 | * |
| 1124 | * syncer_workitem_pending[(syncer_delayno + 15) & syncer_mask] |
| 1125 | * |
| 1126 | */ |
| 1127 | |
| 1128 | /* |
| 1129 | * Add an item to the syncer work queue. |
| 1130 | */ |
| 1131 | static void |
| 1132 | vn_syncer_add_to_worklist(struct vnode *vp, int delay) |
| 1133 | { |
| 1134 | int s, slot; |
| 1135 | |
| 1136 | s = splbio(); |
| 1137 | |
| 1138 | if (vp->v_flag & VONWORKLST) { |
| 1139 | LIST_REMOVE(vp, v_synclist); |
| 1140 | } |
| 1141 | |
| 1142 | if (delay > syncer_maxdelay - 2) |
| 1143 | delay = syncer_maxdelay - 2; |
| 1144 | slot = (syncer_delayno + delay) & syncer_mask; |
| 1145 | |
| 1146 | LIST_INSERT_HEAD(&syncer_workitem_pending[slot], vp, v_synclist); |
| 1147 | vp->v_flag |= VONWORKLST; |
| 1148 | splx(s); |
| 1149 | } |
| 1150 | |
| 1151 | struct thread *updatethread; |
| 1152 | static void sched_sync __P((void)); |
| 1153 | static struct kproc_desc up_kp = { |
| 1154 | "syncer", |
| 1155 | sched_sync, |
| 1156 | &updatethread |
| 1157 | }; |
| 1158 | SYSINIT(syncer, SI_SUB_KTHREAD_UPDATE, SI_ORDER_FIRST, kproc_start, &up_kp) |
| 1159 | |
| 1160 | /* |
| 1161 | * System filesystem synchronizer daemon. |
| 1162 | */ |
| 1163 | void |
| 1164 | sched_sync(void) |
| 1165 | { |
| 1166 | struct synclist *slp; |
| 1167 | struct vnode *vp; |
| 1168 | long starttime; |
| 1169 | int s; |
| 1170 | struct thread *td = curthread; |
| 1171 | |
| 1172 | EVENTHANDLER_REGISTER(shutdown_pre_sync, shutdown_kproc, td, |
| 1173 | SHUTDOWN_PRI_LAST); |
| 1174 | |
| 1175 | for (;;) { |
| 1176 | kproc_suspend_loop(); |
| 1177 | |
| 1178 | starttime = time_second; |
| 1179 | |
| 1180 | /* |
| 1181 | * Push files whose dirty time has expired. Be careful |
| 1182 | * of interrupt race on slp queue. |
| 1183 | */ |
| 1184 | s = splbio(); |
| 1185 | slp = &syncer_workitem_pending[syncer_delayno]; |
| 1186 | syncer_delayno += 1; |
| 1187 | if (syncer_delayno == syncer_maxdelay) |
| 1188 | syncer_delayno = 0; |
| 1189 | splx(s); |
| 1190 | |
| 1191 | while ((vp = LIST_FIRST(slp)) != NULL) { |
| 1192 | if (VOP_ISLOCKED(vp, NULL) == 0) { |
| 1193 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); |
| 1194 | (void) VOP_FSYNC(vp, MNT_LAZY, td); |
| 1195 | VOP_UNLOCK(vp, 0, td); |
| 1196 | } |
| 1197 | s = splbio(); |
| 1198 | if (LIST_FIRST(slp) == vp) { |
| 1199 | /* |
| 1200 | * Note: v_tag VT_VFS vps can remain on the |
| 1201 | * worklist too with no dirty blocks, but |
| 1202 | * since sync_fsync() moves it to a different |
| 1203 | * slot we are safe. |
| 1204 | */ |
| 1205 | if (TAILQ_EMPTY(&vp->v_dirtyblkhd) && |
| 1206 | !vn_isdisk(vp, NULL)) |
| 1207 | panic("sched_sync: fsync failed vp %p tag %d", vp, vp->v_tag); |
| 1208 | /* |
| 1209 | * Put us back on the worklist. The worklist |
| 1210 | * routine will remove us from our current |
| 1211 | * position and then add us back in at a later |
| 1212 | * position. |
| 1213 | */ |
| 1214 | vn_syncer_add_to_worklist(vp, syncdelay); |
| 1215 | } |
| 1216 | splx(s); |
| 1217 | } |
| 1218 | |
| 1219 | /* |
| 1220 | * Do soft update processing. |
| 1221 | */ |
| 1222 | if (bioops.io_sync) |
| 1223 | (*bioops.io_sync)(NULL); |
| 1224 | |
| 1225 | /* |
| 1226 | * The variable rushjob allows the kernel to speed up the |
| 1227 | * processing of the filesystem syncer process. A rushjob |
| 1228 | * value of N tells the filesystem syncer to process the next |
| 1229 | * N seconds worth of work on its queue ASAP. Currently rushjob |
| 1230 | * is used by the soft update code to speed up the filesystem |
| 1231 | * syncer process when the incore state is getting so far |
| 1232 | * ahead of the disk that the kernel memory pool is being |
| 1233 | * threatened with exhaustion. |
| 1234 | */ |
| 1235 | if (rushjob > 0) { |
| 1236 | rushjob -= 1; |
| 1237 | continue; |
| 1238 | } |
| 1239 | /* |
| 1240 | * If it has taken us less than a second to process the |
| 1241 | * current work, then wait. Otherwise start right over |
| 1242 | * again. We can still lose time if any single round |
| 1243 | * takes more than two seconds, but it does not really |
| 1244 | * matter as we are just trying to generally pace the |
| 1245 | * filesystem activity. |
| 1246 | */ |
| 1247 | if (time_second == starttime) |
| 1248 | tsleep(&lbolt, 0, "syncer", 0); |
| 1249 | } |
| 1250 | } |
| 1251 | |
| 1252 | /* |
| 1253 | * Request the syncer daemon to speed up its work. |
| 1254 | * We never push it to speed up more than half of its |
| 1255 | * normal turn time, otherwise it could take over the cpu. |
| 1256 | * |
| 1257 | * YYY wchan field protected by the BGL. |
| 1258 | */ |
| 1259 | int |
| 1260 | speedup_syncer() |
| 1261 | { |
| 1262 | crit_enter(); |
| 1263 | if (updatethread->td_wchan == &lbolt) { /* YYY */ |
| 1264 | unsleep(updatethread); |
| 1265 | lwkt_schedule(updatethread); |
| 1266 | } |
| 1267 | crit_exit(); |
| 1268 | if (rushjob < syncdelay / 2) { |
| 1269 | rushjob += 1; |
| 1270 | stat_rush_requests += 1; |
| 1271 | return (1); |
| 1272 | } |
| 1273 | return(0); |
| 1274 | } |
| 1275 | |
| 1276 | /* |
| 1277 | * Associate a p-buffer with a vnode. |
| 1278 | * |
| 1279 | * Also sets B_PAGING flag to indicate that vnode is not fully associated |
| 1280 | * with the buffer. i.e. the bp has not been linked into the vnode or |
| 1281 | * ref-counted. |
| 1282 | */ |
| 1283 | void |
| 1284 | pbgetvp(vp, bp) |
| 1285 | struct vnode *vp; |
| 1286 | struct buf *bp; |
| 1287 | { |
| 1288 | |
| 1289 | KASSERT(bp->b_vp == NULL, ("pbgetvp: not free")); |
| 1290 | |
| 1291 | bp->b_vp = vp; |
| 1292 | bp->b_flags |= B_PAGING; |
| 1293 | bp->b_dev = vn_todev(vp); |
| 1294 | } |
| 1295 | |
| 1296 | /* |
| 1297 | * Disassociate a p-buffer from a vnode. |
| 1298 | */ |
| 1299 | void |
| 1300 | pbrelvp(bp) |
| 1301 | struct buf *bp; |
| 1302 | { |
| 1303 | |
| 1304 | KASSERT(bp->b_vp != NULL, ("pbrelvp: NULL")); |
| 1305 | |
| 1306 | /* XXX REMOVE ME */ |
| 1307 | if (TAILQ_NEXT(bp, b_vnbufs) != NULL) { |
| 1308 | panic( |
| 1309 | "relpbuf(): b_vp was probably reassignbuf()d %p %x", |
| 1310 | bp, |
| 1311 | (int)bp->b_flags |
| 1312 | ); |
| 1313 | } |
| 1314 | bp->b_vp = (struct vnode *) 0; |
| 1315 | bp->b_flags &= ~B_PAGING; |
| 1316 | } |
| 1317 | |
| 1318 | void |
| 1319 | pbreassignbuf(bp, newvp) |
| 1320 | struct buf *bp; |
| 1321 | struct vnode *newvp; |
| 1322 | { |
| 1323 | if ((bp->b_flags & B_PAGING) == 0) { |
| 1324 | panic( |
| 1325 | "pbreassignbuf() on non phys bp %p", |
| 1326 | bp |
| 1327 | ); |
| 1328 | } |
| 1329 | bp->b_vp = newvp; |
| 1330 | } |
| 1331 | |
| 1332 | /* |
| 1333 | * Reassign a buffer from one vnode to another. |
| 1334 | * Used to assign file specific control information |
| 1335 | * (indirect blocks) to the vnode to which they belong. |
| 1336 | */ |
| 1337 | void |
| 1338 | reassignbuf(bp, newvp) |
| 1339 | struct buf *bp; |
| 1340 | struct vnode *newvp; |
| 1341 | { |
| 1342 | struct buflists *listheadp; |
| 1343 | int delay; |
| 1344 | int s; |
| 1345 | |
| 1346 | if (newvp == NULL) { |
| 1347 | printf("reassignbuf: NULL"); |
| 1348 | return; |
| 1349 | } |
| 1350 | ++reassignbufcalls; |
| 1351 | |
| 1352 | /* |
| 1353 | * B_PAGING flagged buffers cannot be reassigned because their vp |
| 1354 | * is not fully linked in. |
| 1355 | */ |
| 1356 | if (bp->b_flags & B_PAGING) |
| 1357 | panic("cannot reassign paging buffer"); |
| 1358 | |
| 1359 | s = splbio(); |
| 1360 | /* |
| 1361 | * Delete from old vnode list, if on one. |
| 1362 | */ |
| 1363 | if (bp->b_xflags & (BX_VNDIRTY | BX_VNCLEAN)) { |
| 1364 | if (bp->b_xflags & BX_VNDIRTY) |
| 1365 | listheadp = &bp->b_vp->v_dirtyblkhd; |
| 1366 | else |
| 1367 | listheadp = &bp->b_vp->v_cleanblkhd; |
| 1368 | TAILQ_REMOVE(listheadp, bp, b_vnbufs); |
| 1369 | bp->b_xflags &= ~(BX_VNDIRTY | BX_VNCLEAN); |
| 1370 | if (bp->b_vp != newvp) { |
| 1371 | vdrop(bp->b_vp); |
| 1372 | bp->b_vp = NULL; /* for clarification */ |
| 1373 | } |
| 1374 | } |
| 1375 | /* |
| 1376 | * If dirty, put on list of dirty buffers; otherwise insert onto list |
| 1377 | * of clean buffers. |
| 1378 | */ |
| 1379 | if (bp->b_flags & B_DELWRI) { |
| 1380 | struct buf *tbp; |
| 1381 | |
| 1382 | listheadp = &newvp->v_dirtyblkhd; |
| 1383 | if ((newvp->v_flag & VONWORKLST) == 0) { |
| 1384 | switch (newvp->v_type) { |
| 1385 | case VDIR: |
| 1386 | delay = dirdelay; |
| 1387 | break; |
| 1388 | case VCHR: |
| 1389 | case VBLK: |
| 1390 | if (newvp->v_specmountpoint != NULL) { |
| 1391 | delay = metadelay; |
| 1392 | break; |
| 1393 | } |
| 1394 | /* fall through */ |
| 1395 | default: |
| 1396 | delay = filedelay; |
| 1397 | } |
| 1398 | vn_syncer_add_to_worklist(newvp, delay); |
| 1399 | } |
| 1400 | bp->b_xflags |= BX_VNDIRTY; |
| 1401 | tbp = TAILQ_FIRST(listheadp); |
| 1402 | if (tbp == NULL || |
| 1403 | bp->b_lblkno == 0 || |
| 1404 | (bp->b_lblkno > 0 && tbp->b_lblkno < 0) || |
| 1405 | (bp->b_lblkno > 0 && bp->b_lblkno < tbp->b_lblkno)) { |
| 1406 | TAILQ_INSERT_HEAD(listheadp, bp, b_vnbufs); |
| 1407 | ++reassignbufsortgood; |
| 1408 | } else if (bp->b_lblkno < 0) { |
| 1409 | TAILQ_INSERT_TAIL(listheadp, bp, b_vnbufs); |
| 1410 | ++reassignbufsortgood; |
| 1411 | } else if (reassignbufmethod == 1) { |
| 1412 | /* |
| 1413 | * New sorting algorithm, only handle sequential case, |
| 1414 | * otherwise append to end (but before metadata) |
| 1415 | */ |
| 1416 | if ((tbp = gbincore(newvp, bp->b_lblkno - 1)) != NULL && |
| 1417 | (tbp->b_xflags & BX_VNDIRTY)) { |
| 1418 | /* |
| 1419 | * Found the best place to insert the buffer |
| 1420 | */ |
| 1421 | TAILQ_INSERT_AFTER(listheadp, tbp, bp, b_vnbufs); |
| 1422 | ++reassignbufsortgood; |
| 1423 | } else { |
| 1424 | /* |
| 1425 | * Missed, append to end, but before meta-data. |
| 1426 | * We know that the head buffer in the list is |
| 1427 | * not meta-data due to prior conditionals. |
| 1428 | * |
| 1429 | * Indirect effects: NFS second stage write |
| 1430 | * tends to wind up here, giving maximum |
| 1431 | * distance between the unstable write and the |
| 1432 | * commit rpc. |
| 1433 | */ |
| 1434 | tbp = TAILQ_LAST(listheadp, buflists); |
| 1435 | while (tbp && tbp->b_lblkno < 0) |
| 1436 | tbp = TAILQ_PREV(tbp, buflists, b_vnbufs); |
| 1437 | TAILQ_INSERT_AFTER(listheadp, tbp, bp, b_vnbufs); |
| 1438 | ++reassignbufsortbad; |
| 1439 | } |
| 1440 | } else { |
| 1441 | /* |
| 1442 | * Old sorting algorithm, scan queue and insert |
| 1443 | */ |
| 1444 | struct buf *ttbp; |
| 1445 | while ((ttbp = TAILQ_NEXT(tbp, b_vnbufs)) && |
| 1446 | (ttbp->b_lblkno < bp->b_lblkno)) { |
| 1447 | ++reassignbufloops; |
| 1448 | tbp = ttbp; |
| 1449 | } |
| 1450 | TAILQ_INSERT_AFTER(listheadp, tbp, bp, b_vnbufs); |
| 1451 | } |
| 1452 | } else { |
| 1453 | bp->b_xflags |= BX_VNCLEAN; |
| 1454 | TAILQ_INSERT_TAIL(&newvp->v_cleanblkhd, bp, b_vnbufs); |
| 1455 | if ((newvp->v_flag & VONWORKLST) && |
| 1456 | TAILQ_EMPTY(&newvp->v_dirtyblkhd)) { |
| 1457 | newvp->v_flag &= ~VONWORKLST; |
| 1458 | LIST_REMOVE(newvp, v_synclist); |
| 1459 | } |
| 1460 | } |
| 1461 | if (bp->b_vp != newvp) { |
| 1462 | bp->b_vp = newvp; |
| 1463 | vhold(bp->b_vp); |
| 1464 | } |
| 1465 | splx(s); |
| 1466 | } |
| 1467 | |
| 1468 | /* |
| 1469 | * Create a vnode for a block device. |
| 1470 | * Used for mounting the root file system. |
| 1471 | */ |
| 1472 | int |
| 1473 | bdevvp(dev, vpp) |
| 1474 | dev_t dev; |
| 1475 | struct vnode **vpp; |
| 1476 | { |
| 1477 | struct vnode *vp; |
| 1478 | struct vnode *nvp; |
| 1479 | int error; |
| 1480 | |
| 1481 | if (dev == NODEV) { |
| 1482 | *vpp = NULLVP; |
| 1483 | return (ENXIO); |
| 1484 | } |
| 1485 | error = getnewvnode(VT_NON, (struct mount *)0, spec_vnodeop_p, &nvp); |
| 1486 | if (error) { |
| 1487 | *vpp = NULLVP; |
| 1488 | return (error); |
| 1489 | } |
| 1490 | vp = nvp; |
| 1491 | vp->v_type = VBLK; |
| 1492 | addalias(vp, dev); |
| 1493 | *vpp = vp; |
| 1494 | return (0); |
| 1495 | } |
| 1496 | |
| 1497 | /* |
| 1498 | * Add vnode to the alias list hung off the dev_t. |
| 1499 | * |
| 1500 | * The reason for this gunk is that multiple vnodes can reference |
| 1501 | * the same physical device, so checking vp->v_usecount to see |
| 1502 | * how many users there are is inadequate; the v_usecount for |
| 1503 | * the vnodes need to be accumulated. vcount() does that. |
| 1504 | */ |
| 1505 | void |
| 1506 | addaliasu(nvp, nvp_rdev) |
| 1507 | struct vnode *nvp; |
| 1508 | udev_t nvp_rdev; |
| 1509 | { |
| 1510 | |
| 1511 | if (nvp->v_type != VBLK && nvp->v_type != VCHR) |
| 1512 | panic("addaliasu on non-special vnode"); |
| 1513 | addalias(nvp, udev2dev(nvp_rdev, nvp->v_type == VBLK ? 1 : 0)); |
| 1514 | } |
| 1515 | |
| 1516 | void |
| 1517 | addalias(nvp, dev) |
| 1518 | struct vnode *nvp; |
| 1519 | dev_t dev; |
| 1520 | { |
| 1521 | |
| 1522 | if (nvp->v_type != VBLK && nvp->v_type != VCHR) |
| 1523 | panic("addalias on non-special vnode"); |
| 1524 | |
| 1525 | nvp->v_rdev = dev; |
| 1526 | lwkt_gettoken(&spechash_token); |
| 1527 | SLIST_INSERT_HEAD(&dev->si_hlist, nvp, v_specnext); |
| 1528 | lwkt_reltoken(&spechash_token); |
| 1529 | } |
| 1530 | |
| 1531 | /* |
| 1532 | * Grab a particular vnode from the free list, increment its |
| 1533 | * reference count and lock it. The vnode lock bit is set if the |
| 1534 | * vnode is being eliminated in vgone. The process is awakened |
| 1535 | * when the transition is completed, and an error returned to |
| 1536 | * indicate that the vnode is no longer usable (possibly having |
| 1537 | * been changed to a new file system type). |
| 1538 | */ |
| 1539 | int |
| 1540 | vget(vp, flags, td) |
| 1541 | struct vnode *vp; |
| 1542 | int flags; |
| 1543 | struct thread *td; |
| 1544 | { |
| 1545 | int error; |
| 1546 | |
| 1547 | /* |
| 1548 | * If the vnode is in the process of being cleaned out for |
| 1549 | * another use, we wait for the cleaning to finish and then |
| 1550 | * return failure. Cleaning is determined by checking that |
| 1551 | * the VXLOCK flag is set. |
| 1552 | */ |
| 1553 | if ((flags & LK_INTERLOCK) == 0) { |
| 1554 | lwkt_gettoken(&vp->v_interlock); |
| 1555 | } |
| 1556 | if (vp->v_flag & VXLOCK) { |
| 1557 | if (vp->v_vxproc == curproc) { |
| 1558 | #if 0 |
| 1559 | /* this can now occur in normal operation */ |
| 1560 | log(LOG_INFO, "VXLOCK interlock avoided\n"); |
| 1561 | #endif |
| 1562 | } else { |
| 1563 | vp->v_flag |= VXWANT; |
| 1564 | lwkt_reltoken(&vp->v_interlock); |
| 1565 | tsleep((caddr_t)vp, 0, "vget", 0); |
| 1566 | return (ENOENT); |
| 1567 | } |
| 1568 | } |
| 1569 | |
| 1570 | vp->v_usecount++; |
| 1571 | |
| 1572 | if (VSHOULDBUSY(vp)) |
| 1573 | vbusy(vp); |
| 1574 | if (flags & LK_TYPE_MASK) { |
| 1575 | if ((error = vn_lock(vp, flags | LK_INTERLOCK, td)) != 0) { |
| 1576 | /* |
| 1577 | * must expand vrele here because we do not want |
| 1578 | * to call VOP_INACTIVE if the reference count |
| 1579 | * drops back to zero since it was never really |
| 1580 | * active. We must remove it from the free list |
| 1581 | * before sleeping so that multiple processes do |
| 1582 | * not try to recycle it. |
| 1583 | */ |
| 1584 | lwkt_gettoken(&vp->v_interlock); |
| 1585 | vp->v_usecount--; |
| 1586 | if (VSHOULDFREE(vp)) |
| 1587 | vfree(vp); |
| 1588 | else |
| 1589 | vlruvp(vp); |
| 1590 | lwkt_reltoken(&vp->v_interlock); |
| 1591 | } |
| 1592 | return (error); |
| 1593 | } |
| 1594 | lwkt_reltoken(&vp->v_interlock); |
| 1595 | return (0); |
| 1596 | } |
| 1597 | |
| 1598 | void |
| 1599 | vref(struct vnode *vp) |
| 1600 | { |
| 1601 | lwkt_gettoken(&vp->v_interlock); |
| 1602 | vp->v_usecount++; |
| 1603 | lwkt_reltoken(&vp->v_interlock); |
| 1604 | } |
| 1605 | |
| 1606 | /* |
| 1607 | * Vnode put/release. |
| 1608 | * If count drops to zero, call inactive routine and return to freelist. |
| 1609 | */ |
| 1610 | void |
| 1611 | vrele(struct vnode *vp) |
| 1612 | { |
| 1613 | struct thread *td = curthread; /* XXX */ |
| 1614 | |
| 1615 | KASSERT(vp != NULL, ("vrele: null vp")); |
| 1616 | |
| 1617 | lwkt_gettoken(&vp->v_interlock); |
| 1618 | |
| 1619 | if (vp->v_usecount > 1) { |
| 1620 | |
| 1621 | vp->v_usecount--; |
| 1622 | lwkt_reltoken(&vp->v_interlock); |
| 1623 | |
| 1624 | return; |
| 1625 | } |
| 1626 | |
| 1627 | if (vp->v_usecount == 1) { |
| 1628 | vp->v_usecount--; |
| 1629 | /* |
| 1630 | * We must call VOP_INACTIVE with the node locked. |
| 1631 | * If we are doing a vpu, the node is already locked, |
| 1632 | * but, in the case of vrele, we must explicitly lock |
| 1633 | * the vnode before calling VOP_INACTIVE |
| 1634 | */ |
| 1635 | |
| 1636 | if (vn_lock(vp, LK_EXCLUSIVE | LK_INTERLOCK, td) == 0) |
| 1637 | VOP_INACTIVE(vp, td); |
| 1638 | if (VSHOULDFREE(vp)) |
| 1639 | vfree(vp); |
| 1640 | else |
| 1641 | vlruvp(vp); |
| 1642 | } else { |
| 1643 | #ifdef DIAGNOSTIC |
| 1644 | vprint("vrele: negative ref count", vp); |
| 1645 | lwkt_reltoken(&vp->v_interlock); |
| 1646 | #endif |
| 1647 | panic("vrele: negative ref cnt"); |
| 1648 | } |
| 1649 | } |
| 1650 | |
| 1651 | void |
| 1652 | vput(struct vnode *vp) |
| 1653 | { |
| 1654 | struct thread *td = curthread; /* XXX */ |
| 1655 | |
| 1656 | KASSERT(vp != NULL, ("vput: null vp")); |
| 1657 | |
| 1658 | lwkt_gettoken(&vp->v_interlock); |
| 1659 | |
| 1660 | if (vp->v_usecount > 1) { |
| 1661 | vp->v_usecount--; |
| 1662 | VOP_UNLOCK(vp, LK_INTERLOCK, td); |
| 1663 | return; |
| 1664 | } |
| 1665 | |
| 1666 | if (vp->v_usecount == 1) { |
| 1667 | vp->v_usecount--; |
| 1668 | /* |
| 1669 | * We must call VOP_INACTIVE with the node locked. |
| 1670 | * If we are doing a vpu, the node is already locked, |
| 1671 | * so we just need to release the vnode mutex. |
| 1672 | */ |
| 1673 | lwkt_reltoken(&vp->v_interlock); |
| 1674 | VOP_INACTIVE(vp, td); |
| 1675 | if (VSHOULDFREE(vp)) |
| 1676 | vfree(vp); |
| 1677 | else |
| 1678 | vlruvp(vp); |
| 1679 | } else { |
| 1680 | #ifdef DIAGNOSTIC |
| 1681 | vprint("vput: negative ref count", vp); |
| 1682 | #endif |
| 1683 | panic("vput: negative ref cnt"); |
| 1684 | } |
| 1685 | } |
| 1686 | |
| 1687 | /* |
| 1688 | * Somebody doesn't want the vnode recycled. |
| 1689 | */ |
| 1690 | void |
| 1691 | vhold(vp) |
| 1692 | struct vnode *vp; |
| 1693 | { |
| 1694 | int s; |
| 1695 | |
| 1696 | s = splbio(); |
| 1697 | vp->v_holdcnt++; |
| 1698 | if (VSHOULDBUSY(vp)) |
| 1699 | vbusy(vp); |
| 1700 | splx(s); |
| 1701 | } |
| 1702 | |
| 1703 | /* |
| 1704 | * One less who cares about this vnode. |
| 1705 | */ |
| 1706 | void |
| 1707 | vdrop(vp) |
| 1708 | struct vnode *vp; |
| 1709 | { |
| 1710 | int s; |
| 1711 | |
| 1712 | s = splbio(); |
| 1713 | if (vp->v_holdcnt <= 0) |
| 1714 | panic("vdrop: holdcnt"); |
| 1715 | vp->v_holdcnt--; |
| 1716 | if (VSHOULDFREE(vp)) |
| 1717 | vfree(vp); |
| 1718 | splx(s); |
| 1719 | } |
| 1720 | |
| 1721 | /* |
| 1722 | * Remove any vnodes in the vnode table belonging to mount point mp. |
| 1723 | * |
| 1724 | * If FORCECLOSE is not specified, there should not be any active ones, |
| 1725 | * return error if any are found (nb: this is a user error, not a |
| 1726 | * system error). If FORCECLOSE is specified, detach any active vnodes |
| 1727 | * that are found. |
| 1728 | * |
| 1729 | * If WRITECLOSE is set, only flush out regular file vnodes open for |
| 1730 | * writing. |
| 1731 | * |
| 1732 | * SKIPSYSTEM causes any vnodes marked VSYSTEM to be skipped. |
| 1733 | * |
| 1734 | * `rootrefs' specifies the base reference count for the root vnode |
| 1735 | * of this filesystem. The root vnode is considered busy if its |
| 1736 | * v_usecount exceeds this value. On a successful return, vflush() |
| 1737 | * will call vrele() on the root vnode exactly rootrefs times. |
| 1738 | * If the SKIPSYSTEM or WRITECLOSE flags are specified, rootrefs must |
| 1739 | * be zero. |
| 1740 | */ |
| 1741 | #ifdef DIAGNOSTIC |
| 1742 | static int busyprt = 0; /* print out busy vnodes */ |
| 1743 | SYSCTL_INT(_debug, OID_AUTO, busyprt, CTLFLAG_RW, &busyprt, 0, ""); |
| 1744 | #endif |
| 1745 | |
| 1746 | int |
| 1747 | vflush(mp, rootrefs, flags) |
| 1748 | struct mount *mp; |
| 1749 | int rootrefs; |
| 1750 | int flags; |
| 1751 | { |
| 1752 | struct thread *td = curthread; /* XXX */ |
| 1753 | struct vnode *vp, *nvp, *rootvp = NULL; |
| 1754 | struct vattr vattr; |
| 1755 | int busy = 0, error; |
| 1756 | |
| 1757 | if (rootrefs > 0) { |
| 1758 | KASSERT((flags & (SKIPSYSTEM | WRITECLOSE)) == 0, |
| 1759 | ("vflush: bad args")); |
| 1760 | /* |
| 1761 | * Get the filesystem root vnode. We can vput() it |
| 1762 | * immediately, since with rootrefs > 0, it won't go away. |
| 1763 | */ |
| 1764 | if ((error = VFS_ROOT(mp, &rootvp)) != 0) |
| 1765 | return (error); |
| 1766 | vput(rootvp); |
| 1767 | } |
| 1768 | lwkt_gettoken(&mntvnode_token); |
| 1769 | loop: |
| 1770 | for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist); vp; vp = nvp) { |
| 1771 | /* |
| 1772 | * Make sure this vnode wasn't reclaimed in getnewvnode(). |
| 1773 | * Start over if it has (it won't be on the list anymore). |
| 1774 | */ |
| 1775 | if (vp->v_mount != mp) |
| 1776 | goto loop; |
| 1777 | nvp = TAILQ_NEXT(vp, v_nmntvnodes); |
| 1778 | |
| 1779 | lwkt_gettoken(&vp->v_interlock); |
| 1780 | /* |
| 1781 | * Skip over a vnodes marked VSYSTEM. |
| 1782 | */ |
| 1783 | if ((flags & SKIPSYSTEM) && (vp->v_flag & VSYSTEM)) { |
| 1784 | lwkt_reltoken(&vp->v_interlock); |
| 1785 | continue; |
| 1786 | } |
| 1787 | /* |
| 1788 | * If WRITECLOSE is set, flush out unlinked but still open |
| 1789 | * files (even if open only for reading) and regular file |
| 1790 | * vnodes open for writing. |
| 1791 | */ |
| 1792 | if ((flags & WRITECLOSE) && |
| 1793 | (vp->v_type == VNON || |
| 1794 | (VOP_GETATTR(vp, &vattr, td) == 0 && |
| 1795 | vattr.va_nlink > 0)) && |
| 1796 | (vp->v_writecount == 0 || vp->v_type != VREG)) { |
| 1797 | lwkt_reltoken(&vp->v_interlock); |
| 1798 | continue; |
| 1799 | } |
| 1800 | |
| 1801 | /* |
| 1802 | * With v_usecount == 0, all we need to do is clear out the |
| 1803 | * vnode data structures and we are done. |
| 1804 | */ |
| 1805 | if (vp->v_usecount == 0) { |
| 1806 | lwkt_reltoken(&mntvnode_token); |
| 1807 | vgonel(vp, td); |
| 1808 | lwkt_gettoken(&mntvnode_token); |
| 1809 | continue; |
| 1810 | } |
| 1811 | |
| 1812 | /* |
| 1813 | * If FORCECLOSE is set, forcibly close the vnode. For block |
| 1814 | * or character devices, revert to an anonymous device. For |
| 1815 | * all other files, just kill them. |
| 1816 | */ |
| 1817 | if (flags & FORCECLOSE) { |
| 1818 | lwkt_reltoken(&mntvnode_token); |
| 1819 | if (vp->v_type != VBLK && vp->v_type != VCHR) { |
| 1820 | vgonel(vp, td); |
| 1821 | } else { |
| 1822 | vclean(vp, 0, td); |
| 1823 | vp->v_op = spec_vnodeop_p; |
| 1824 | insmntque(vp, (struct mount *) 0); |
| 1825 | } |
| 1826 | lwkt_gettoken(&mntvnode_token); |
| 1827 | continue; |
| 1828 | } |
| 1829 | #ifdef DIAGNOSTIC |
| 1830 | if (busyprt) |
| 1831 | vprint("vflush: busy vnode", vp); |
| 1832 | #endif |
| 1833 | lwkt_reltoken(&vp->v_interlock); |
| 1834 | busy++; |
| 1835 | } |
| 1836 | lwkt_reltoken(&mntvnode_token); |
| 1837 | if (rootrefs > 0 && (flags & FORCECLOSE) == 0) { |
| 1838 | /* |
| 1839 | * If just the root vnode is busy, and if its refcount |
| 1840 | * is equal to `rootrefs', then go ahead and kill it. |
| 1841 | */ |
| 1842 | lwkt_gettoken(&rootvp->v_interlock); |
| 1843 | KASSERT(busy > 0, ("vflush: not busy")); |
| 1844 | KASSERT(rootvp->v_usecount >= rootrefs, ("vflush: rootrefs")); |
| 1845 | if (busy == 1 && rootvp->v_usecount == rootrefs) { |
| 1846 | vgonel(rootvp, td); |
| 1847 | busy = 0; |
| 1848 | } else |
| 1849 | lwkt_reltoken(&rootvp->v_interlock); |
| 1850 | } |
| 1851 | if (busy) |
| 1852 | return (EBUSY); |
| 1853 | for (; rootrefs > 0; rootrefs--) |
| 1854 | vrele(rootvp); |
| 1855 | return (0); |
| 1856 | } |
| 1857 | |
| 1858 | /* |
| 1859 | * We do not want to recycle the vnode too quickly. |
| 1860 | * |
| 1861 | * XXX we can't move vp's around the nvnodelist without really screwing |
| 1862 | * up the efficiency of filesystem SYNC and friends. This code is |
| 1863 | * disabled until we fix the syncing code's scanning algorithm. |
| 1864 | */ |
| 1865 | static void |
| 1866 | vlruvp(struct vnode *vp) |
| 1867 | { |
| 1868 | #if 0 |
| 1869 | struct mount *mp; |
| 1870 | |
| 1871 | if ((mp = vp->v_mount) != NULL) { |
| 1872 | lwkt_gettoken(&mntvnode_token); |
| 1873 | TAILQ_REMOVE(&mp->mnt_nvnodelist, vp, v_nmntvnodes); |
| 1874 | TAILQ_INSERT_TAIL(&mp->mnt_nvnodelist, vp, v_nmntvnodes); |
| 1875 | lwkt_reltoken(&mntvnode_token); |
| 1876 | } |
| 1877 | #endif |
| 1878 | } |
| 1879 | |
| 1880 | /* |
| 1881 | * Disassociate the underlying file system from a vnode. |
| 1882 | */ |
| 1883 | static void |
| 1884 | vclean(struct vnode *vp, int flags, struct thread *td) |
| 1885 | { |
| 1886 | int active; |
| 1887 | |
| 1888 | /* |
| 1889 | * Check to see if the vnode is in use. If so we have to reference it |
| 1890 | * before we clean it out so that its count cannot fall to zero and |
| 1891 | * generate a race against ourselves to recycle it. |
| 1892 | */ |
| 1893 | if ((active = vp->v_usecount)) |
| 1894 | vp->v_usecount++; |
| 1895 | |
| 1896 | /* |
| 1897 | * Prevent the vnode from being recycled or brought into use while we |
| 1898 | * clean it out. |
| 1899 | */ |
| 1900 | if (vp->v_flag & VXLOCK) |
| 1901 | panic("vclean: deadlock"); |
| 1902 | vp->v_flag |= VXLOCK; |
| 1903 | vp->v_vxproc = curproc; |
| 1904 | /* |
| 1905 | * Even if the count is zero, the VOP_INACTIVE routine may still |
| 1906 | * have the object locked while it cleans it out. The VOP_LOCK |
| 1907 | * ensures that the VOP_INACTIVE routine is done with its work. |
| 1908 | * For active vnodes, it ensures that no other activity can |
| 1909 | * occur while the underlying object is being cleaned out. |
| 1910 | */ |
| 1911 | VOP_LOCK(vp, LK_DRAIN | LK_INTERLOCK, td); |
| 1912 | |
| 1913 | /* |
| 1914 | * Clean out any buffers associated with the vnode. |
| 1915 | */ |
| 1916 | vinvalbuf(vp, V_SAVE, td, 0, 0); |
| 1917 | |
| 1918 | VOP_DESTROYVOBJECT(vp); |
| 1919 | |
| 1920 | /* |
| 1921 | * If purging an active vnode, it must be closed and |
| 1922 | * deactivated before being reclaimed. Note that the |
| 1923 | * VOP_INACTIVE will unlock the vnode. |
| 1924 | */ |
| 1925 | if (active) { |
| 1926 | if (flags & DOCLOSE) |
| 1927 | VOP_CLOSE(vp, FNONBLOCK, td); |
| 1928 | VOP_INACTIVE(vp, td); |
| 1929 | } else { |
| 1930 | /* |
| 1931 | * Any other processes trying to obtain this lock must first |
| 1932 | * wait for VXLOCK to clear, then call the new lock operation. |
| 1933 | */ |
| 1934 | VOP_UNLOCK(vp, 0, td); |
| 1935 | } |
| 1936 | /* |
| 1937 | * Reclaim the vnode. |
| 1938 | */ |
| 1939 | if (VOP_RECLAIM(vp, td)) |
| 1940 | panic("vclean: cannot reclaim"); |
| 1941 | |
| 1942 | if (active) { |
| 1943 | /* |
| 1944 | * Inline copy of vrele() since VOP_INACTIVE |
| 1945 | * has already been called. |
| 1946 | */ |
| 1947 | lwkt_gettoken(&vp->v_interlock); |
| 1948 | if (--vp->v_usecount <= 0) { |
| 1949 | #ifdef DIAGNOSTIC |
| 1950 | if (vp->v_usecount < 0 || vp->v_writecount != 0) { |
| 1951 | vprint("vclean: bad ref count", vp); |
| 1952 | panic("vclean: ref cnt"); |
| 1953 | } |
| 1954 | #endif |
| 1955 | vfree(vp); |
| 1956 | } |
| 1957 | lwkt_reltoken(&vp->v_interlock); |
| 1958 | } |
| 1959 | |
| 1960 | cache_purge(vp); |
| 1961 | vp->v_vnlock = NULL; |
| 1962 | |
| 1963 | if (VSHOULDFREE(vp)) |
| 1964 | vfree(vp); |
| 1965 | |
| 1966 | /* |
| 1967 | * Done with purge, notify sleepers of the grim news. |
| 1968 | */ |
| 1969 | vp->v_op = dead_vnodeop_p; |
| 1970 | vn_pollgone(vp); |
| 1971 | vp->v_tag = VT_NON; |
| 1972 | vp->v_flag &= ~VXLOCK; |
| 1973 | vp->v_vxproc = NULL; |
| 1974 | if (vp->v_flag & VXWANT) { |
| 1975 | vp->v_flag &= ~VXWANT; |
| 1976 | wakeup((caddr_t) vp); |
| 1977 | } |
| 1978 | } |
| 1979 | |
| 1980 | /* |
| 1981 | * Eliminate all activity associated with the requested vnode |
| 1982 | * and with all vnodes aliased to the requested vnode. |
| 1983 | */ |
| 1984 | int |
| 1985 | vop_revoke(ap) |
| 1986 | struct vop_revoke_args /* { |
| 1987 | struct vnode *a_vp; |
| 1988 | int a_flags; |
| 1989 | } */ *ap; |
| 1990 | { |
| 1991 | struct vnode *vp, *vq; |
| 1992 | dev_t dev; |
| 1993 | |
| 1994 | KASSERT((ap->a_flags & REVOKEALL) != 0, ("vop_revoke")); |
| 1995 | |
| 1996 | vp = ap->a_vp; |
| 1997 | /* |
| 1998 | * If a vgone (or vclean) is already in progress, |
| 1999 | * wait until it is done and return. |
| 2000 | */ |
| 2001 | if (vp->v_flag & VXLOCK) { |
| 2002 | vp->v_flag |= VXWANT; |
| 2003 | lwkt_reltoken(&vp->v_interlock); |
| 2004 | tsleep((caddr_t)vp, 0, "vop_revokeall", 0); |
| 2005 | return (0); |
| 2006 | } |
| 2007 | dev = vp->v_rdev; |
| 2008 | for (;;) { |
| 2009 | lwkt_gettoken(&spechash_token); |
| 2010 | vq = SLIST_FIRST(&dev->si_hlist); |
| 2011 | lwkt_reltoken(&spechash_token); |
| 2012 | if (!vq) |
| 2013 | break; |
| 2014 | vgone(vq); |
| 2015 | } |
| 2016 | return (0); |
| 2017 | } |
| 2018 | |
| 2019 | /* |
| 2020 | * Recycle an unused vnode to the front of the free list. |
| 2021 | * Release the passed interlock if the vnode will be recycled. |
| 2022 | */ |
| 2023 | int |
| 2024 | vrecycle(struct vnode *vp, struct lwkt_token *inter_lkp, struct thread *td) |
| 2025 | { |
| 2026 | lwkt_gettoken(&vp->v_interlock); |
| 2027 | if (vp->v_usecount == 0) { |
| 2028 | if (inter_lkp) { |
| 2029 | lwkt_reltoken(inter_lkp); |
| 2030 | } |
| 2031 | vgonel(vp, td); |
| 2032 | return (1); |
| 2033 | } |
| 2034 | lwkt_reltoken(&vp->v_interlock); |
| 2035 | return (0); |
| 2036 | } |
| 2037 | |
| 2038 | /* |
| 2039 | * Eliminate all activity associated with a vnode |
| 2040 | * in preparation for reuse. |
| 2041 | */ |
| 2042 | void |
| 2043 | vgone(struct vnode *vp) |
| 2044 | { |
| 2045 | struct thread *td = curthread; /* XXX */ |
| 2046 | |
| 2047 | lwkt_gettoken(&vp->v_interlock); |
| 2048 | vgonel(vp, td); |
| 2049 | } |
| 2050 | |
| 2051 | /* |
| 2052 | * vgone, with the vp interlock held. |
| 2053 | */ |
| 2054 | void |
| 2055 | vgonel(struct vnode *vp, struct thread *td) |
| 2056 | { |
| 2057 | int s; |
| 2058 | |
| 2059 | /* |
| 2060 | * If a vgone (or vclean) is already in progress, |
| 2061 | * wait until it is done and return. |
| 2062 | */ |
| 2063 | if (vp->v_flag & VXLOCK) { |
| 2064 | vp->v_flag |= VXWANT; |
| 2065 | lwkt_reltoken(&vp->v_interlock); |
| 2066 | tsleep((caddr_t)vp, 0, "vgone", 0); |
| 2067 | return; |
| 2068 | } |
| 2069 | |
| 2070 | /* |
| 2071 | * Clean out the filesystem specific data. |
| 2072 | */ |
| 2073 | vclean(vp, DOCLOSE, td); |
| 2074 | lwkt_gettoken(&vp->v_interlock); |
| 2075 | |
| 2076 | /* |
| 2077 | * Delete from old mount point vnode list, if on one. |
| 2078 | */ |
| 2079 | if (vp->v_mount != NULL) |
| 2080 | insmntque(vp, (struct mount *)0); |
| 2081 | /* |
| 2082 | * If special device, remove it from special device alias list |
| 2083 | * if it is on one. |
| 2084 | */ |
| 2085 | if ((vp->v_type == VBLK || vp->v_type == VCHR) && vp->v_rdev != NULL) { |
| 2086 | lwkt_gettoken(&spechash_token); |
| 2087 | SLIST_REMOVE(&vp->v_hashchain, vp, vnode, v_specnext); |
| 2088 | freedev(vp->v_rdev); |
| 2089 | lwkt_reltoken(&spechash_token); |
| 2090 | vp->v_rdev = NULL; |
| 2091 | } |
| 2092 | |
| 2093 | /* |
| 2094 | * If it is on the freelist and not already at the head, |
| 2095 | * move it to the head of the list. The test of the |
| 2096 | * VDOOMED flag and the reference count of zero is because |
| 2097 | * it will be removed from the free list by getnewvnode, |
| 2098 | * but will not have its reference count incremented until |
| 2099 | * after calling vgone. If the reference count were |
| 2100 | * incremented first, vgone would (incorrectly) try to |
| 2101 | * close the previous instance of the underlying object. |
| 2102 | */ |
| 2103 | if (vp->v_usecount == 0 && !(vp->v_flag & VDOOMED)) { |
| 2104 | s = splbio(); |
| 2105 | lwkt_gettoken(&vnode_free_list_token); |
| 2106 | if (vp->v_flag & VFREE) |
| 2107 | TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); |
| 2108 | else |
| 2109 | freevnodes++; |
| 2110 | vp->v_flag |= VFREE; |
| 2111 | TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist); |
| 2112 | lwkt_reltoken(&vnode_free_list_token); |
| 2113 | splx(s); |
| 2114 | } |
| 2115 | |
| 2116 | vp->v_type = VBAD; |
| 2117 | lwkt_reltoken(&vp->v_interlock); |
| 2118 | } |
| 2119 | |
| 2120 | /* |
| 2121 | * Lookup a vnode by device number. |
| 2122 | */ |
| 2123 | int |
| 2124 | vfinddev(dev, type, vpp) |
| 2125 | dev_t dev; |
| 2126 | enum vtype type; |
| 2127 | struct vnode **vpp; |
| 2128 | { |
| 2129 | struct vnode *vp; |
| 2130 | |
| 2131 | lwkt_gettoken(&spechash_token); |
| 2132 | SLIST_FOREACH(vp, &dev->si_hlist, v_specnext) { |
| 2133 | if (type == vp->v_type) { |
| 2134 | *vpp = vp; |
| 2135 | lwkt_reltoken(&spechash_token); |
| 2136 | return (1); |
| 2137 | } |
| 2138 | } |
| 2139 | lwkt_reltoken(&spechash_token); |
| 2140 | return (0); |
| 2141 | } |
| 2142 | |
| 2143 | /* |
| 2144 | * Calculate the total number of references to a special device. |
| 2145 | */ |
| 2146 | int |
| 2147 | vcount(vp) |
| 2148 | struct vnode *vp; |
| 2149 | { |
| 2150 | struct vnode *vq; |
| 2151 | int count; |
| 2152 | |
| 2153 | count = 0; |
| 2154 | lwkt_gettoken(&spechash_token); |
| 2155 | SLIST_FOREACH(vq, &vp->v_hashchain, v_specnext) |
| 2156 | count += vq->v_usecount; |
| 2157 | lwkt_reltoken(&spechash_token); |
| 2158 | return (count); |
| 2159 | } |
| 2160 | |
| 2161 | /* |
| 2162 | * Same as above, but using the dev_t as argument |
| 2163 | */ |
| 2164 | |
| 2165 | int |
| 2166 | count_dev(dev) |
| 2167 | dev_t dev; |
| 2168 | { |
| 2169 | struct vnode *vp; |
| 2170 | |
| 2171 | vp = SLIST_FIRST(&dev->si_hlist); |
| 2172 | if (vp == NULL) |
| 2173 | return (0); |
| 2174 | return(vcount(vp)); |
| 2175 | } |
| 2176 | |
| 2177 | /* |
| 2178 | * Print out a description of a vnode. |
| 2179 | */ |
| 2180 | static char *typename[] = |
| 2181 | {"VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD"}; |
| 2182 | |
| 2183 | void |
| 2184 | vprint(label, vp) |
| 2185 | char *label; |
| 2186 | struct vnode *vp; |
| 2187 | { |
| 2188 | char buf[96]; |
| 2189 | |
| 2190 | if (label != NULL) |
| 2191 | printf("%s: %p: ", label, (void *)vp); |
| 2192 | else |
| 2193 | printf("%p: ", (void *)vp); |
| 2194 | printf("type %s, usecount %d, writecount %d, refcount %d,", |
| 2195 | typename[vp->v_type], vp->v_usecount, vp->v_writecount, |
| 2196 | vp->v_holdcnt); |
| 2197 | buf[0] = '\0'; |
| 2198 | if (vp->v_flag & VROOT) |
| 2199 | strcat(buf, "|VROOT"); |
| 2200 | if (vp->v_flag & VTEXT) |
| 2201 | strcat(buf, "|VTEXT"); |
| 2202 | if (vp->v_flag & VSYSTEM) |
| 2203 | strcat(buf, "|VSYSTEM"); |
| 2204 | if (vp->v_flag & VXLOCK) |
| 2205 | strcat(buf, "|VXLOCK"); |
| 2206 | if (vp->v_flag & VXWANT) |
| 2207 | strcat(buf, "|VXWANT"); |
| 2208 | if (vp->v_flag & VBWAIT) |
| 2209 | strcat(buf, "|VBWAIT"); |
| 2210 | if (vp->v_flag & VDOOMED) |
| 2211 | strcat(buf, "|VDOOMED"); |
| 2212 | if (vp->v_flag & VFREE) |
| 2213 | strcat(buf, "|VFREE"); |
| 2214 | if (vp->v_flag & VOBJBUF) |
| 2215 | strcat(buf, "|VOBJBUF"); |
| 2216 | if (buf[0] != '\0') |
| 2217 | printf(" flags (%s)", &buf[1]); |
| 2218 | if (vp->v_data == NULL) { |
| 2219 | printf("\n"); |
| 2220 | } else { |
| 2221 | printf("\n\t"); |
| 2222 | VOP_PRINT(vp); |
| 2223 | } |
| 2224 | } |
| 2225 | |
| 2226 | #ifdef DDB |
| 2227 | #include <ddb/ddb.h> |
| 2228 | /* |
| 2229 | * List all of the locked vnodes in the system. |
| 2230 | * Called when debugging the kernel. |
| 2231 | */ |
| 2232 | DB_SHOW_COMMAND(lockedvnodes, lockedvnodes) |
| 2233 | { |
| 2234 | struct thread *td = curthread; /* XXX */ |
| 2235 | struct mount *mp, *nmp; |
| 2236 | struct vnode *vp; |
| 2237 | |
| 2238 | printf("Locked vnodes\n"); |
| 2239 | lwkt_gettoken(&mountlist_token); |
| 2240 | for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { |
| 2241 | if (vfs_busy(mp, LK_NOWAIT, &mountlist_token, td)) { |
| 2242 | nmp = TAILQ_NEXT(mp, mnt_list); |
| 2243 | continue; |
| 2244 | } |
| 2245 | TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes) { |
| 2246 | if (VOP_ISLOCKED(vp, NULL)) |
| 2247 | vprint((char *)0, vp); |
| 2248 | } |
| 2249 | lwkt_gettoken(&mountlist_token); |
| 2250 | nmp = TAILQ_NEXT(mp, mnt_list); |
| 2251 | vfs_unbusy(mp, td); |
| 2252 | } |
| 2253 | lwkt_reltoken(&mountlist_token); |
| 2254 | } |
| 2255 | #endif |
| 2256 | |
| 2257 | /* |
| 2258 | * Top level filesystem related information gathering. |
| 2259 | */ |
| 2260 | static int sysctl_ovfs_conf __P((SYSCTL_HANDLER_ARGS)); |
| 2261 | |
| 2262 | static int |
| 2263 | vfs_sysctl(SYSCTL_HANDLER_ARGS) |
| 2264 | { |
| 2265 | int *name = (int *)arg1 - 1; /* XXX */ |
| 2266 | u_int namelen = arg2 + 1; /* XXX */ |
| 2267 | struct vfsconf *vfsp; |
| 2268 | |
| 2269 | #if 1 || defined(COMPAT_PRELITE2) |
| 2270 | /* Resolve ambiguity between VFS_VFSCONF and VFS_GENERIC. */ |
| 2271 | if (namelen == 1) |
| 2272 | return (sysctl_ovfs_conf(oidp, arg1, arg2, req)); |
| 2273 | #endif |
| 2274 | |
| 2275 | #ifdef notyet |
| 2276 | /* all sysctl names at this level are at least name and field */ |
| 2277 | if (namelen < 2) |
| 2278 | return (ENOTDIR); /* overloaded */ |
| 2279 | if (name[0] != VFS_GENERIC) { |
| 2280 | for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) |
| 2281 | if (vfsp->vfc_typenum == name[0]) |
| 2282 | break; |
| 2283 | if (vfsp == NULL) |
| 2284 | return (EOPNOTSUPP); |
| 2285 | return ((*vfsp->vfc_vfsops->vfs_sysctl)(&name[1], namelen - 1, |
| 2286 | oldp, oldlenp, newp, newlen, p)); |
| 2287 | } |
| 2288 | #endif |
| 2289 | switch (name[1]) { |
| 2290 | case VFS_MAXTYPENUM: |
| 2291 | if (namelen != 2) |
| 2292 | return (ENOTDIR); |
| 2293 | return (SYSCTL_OUT(req, &maxvfsconf, sizeof(int))); |
| 2294 | case VFS_CONF: |
| 2295 | if (namelen != 3) |
| 2296 | return (ENOTDIR); /* overloaded */ |
| 2297 | for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) |
| 2298 | if (vfsp->vfc_typenum == name[2]) |
| 2299 | break; |
| 2300 | if (vfsp == NULL) |
| 2301 | return (EOPNOTSUPP); |
| 2302 | return (SYSCTL_OUT(req, vfsp, sizeof *vfsp)); |
| 2303 | } |
| 2304 | return (EOPNOTSUPP); |
| 2305 | } |
| 2306 | |
| 2307 | SYSCTL_NODE(_vfs, VFS_GENERIC, generic, CTLFLAG_RD, vfs_sysctl, |
| 2308 | "Generic filesystem"); |
| 2309 | |
| 2310 | #if 1 || defined(COMPAT_PRELITE2) |
| 2311 | |
| 2312 | static int |
| 2313 | sysctl_ovfs_conf(SYSCTL_HANDLER_ARGS) |
| 2314 | { |
| 2315 | int error; |
| 2316 | struct vfsconf *vfsp; |
| 2317 | struct ovfsconf ovfs; |
| 2318 | |
| 2319 | for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) { |
| 2320 | ovfs.vfc_vfsops = vfsp->vfc_vfsops; /* XXX used as flag */ |
| 2321 | strcpy(ovfs.vfc_name, vfsp->vfc_name); |
| 2322 | ovfs.vfc_index = vfsp->vfc_typenum; |
| 2323 | ovfs.vfc_refcount = vfsp->vfc_refcount; |
| 2324 | ovfs.vfc_flags = vfsp->vfc_flags; |
| 2325 | error = SYSCTL_OUT(req, &ovfs, sizeof ovfs); |
| 2326 | if (error) |
| 2327 | return error; |
| 2328 | } |
| 2329 | return 0; |
| 2330 | } |
| 2331 | |
| 2332 | #endif /* 1 || COMPAT_PRELITE2 */ |
| 2333 | |
| 2334 | #if 0 |
| 2335 | #define KINFO_VNODESLOP 10 |
| 2336 | /* |
| 2337 | * Dump vnode list (via sysctl). |
| 2338 | * Copyout address of vnode followed by vnode. |
| 2339 | */ |
| 2340 | /* ARGSUSED */ |
| 2341 | static int |
| 2342 | sysctl_vnode(SYSCTL_HANDLER_ARGS) |
| 2343 | { |
| 2344 | struct proc *p = curproc; /* XXX */ |
| 2345 | struct mount *mp, *nmp; |
| 2346 | struct vnode *nvp, *vp; |
| 2347 | int error; |
| 2348 | |
| 2349 | #define VPTRSZ sizeof (struct vnode *) |
| 2350 | #define VNODESZ sizeof (struct vnode) |
| 2351 | |
| 2352 | req->lock = 0; |
| 2353 | if (!req->oldptr) /* Make an estimate */ |
| 2354 | return (SYSCTL_OUT(req, 0, |
| 2355 | (numvnodes + KINFO_VNODESLOP) * (VPTRSZ + VNODESZ))); |
| 2356 | |
| 2357 | lwkt_gettoken(&mountlist_token); |
| 2358 | for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { |
| 2359 | if (vfs_busy(mp, LK_NOWAIT, &mountlist_token, p)) { |
| 2360 | nmp = TAILQ_NEXT(mp, mnt_list); |
| 2361 | continue; |
| 2362 | } |
| 2363 | again: |
| 2364 | lwkt_gettoken(&mntvnode_token); |
| 2365 | for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist); |
| 2366 | vp != NULL; |
| 2367 | vp = nvp) { |
| 2368 | /* |
| 2369 | * Check that the vp is still associated with |
| 2370 | * this filesystem. RACE: could have been |
| 2371 | * recycled onto the same filesystem. |
| 2372 | */ |
| 2373 | if (vp->v_mount != mp) { |
| 2374 | lwkt_reltoken(&mntvnode_token); |
| 2375 | goto again; |
| 2376 | } |
| 2377 | nvp = TAILQ_NEXT(vp, v_nmntvnodes); |
| 2378 | lwkt_reltoken(&mntvnode_token); |
| 2379 | if ((error = SYSCTL_OUT(req, &vp, VPTRSZ)) || |
| 2380 | (error = SYSCTL_OUT(req, vp, VNODESZ))) |
| 2381 | return (error); |
| 2382 | lwkt_gettoken(&mntvnode_token); |
| 2383 | } |
| 2384 | lwkt_reltoken(&mntvnode_token); |
| 2385 | lwkt_gettoken(&mountlist_token); |
| 2386 | nmp = TAILQ_NEXT(mp, mnt_list); |
| 2387 | vfs_unbusy(mp, p); |
| 2388 | } |
| 2389 | lwkt_reltoken(&mountlist_token); |
| 2390 | |
| 2391 | return (0); |
| 2392 | } |
| 2393 | #endif |
| 2394 | |
| 2395 | /* |
| 2396 | * XXX |
| 2397 | * Exporting the vnode list on large systems causes them to crash. |
| 2398 | * Exporting the vnode list on medium systems causes sysctl to coredump. |
| 2399 | */ |
| 2400 | #if 0 |
| 2401 | SYSCTL_PROC(_kern, KERN_VNODE, vnode, CTLTYPE_OPAQUE|CTLFLAG_RD, |
| 2402 | 0, 0, sysctl_vnode, "S,vnode", ""); |
| 2403 | #endif |
| 2404 | |
| 2405 | /* |
| 2406 | * Check to see if a filesystem is mounted on a block device. |
| 2407 | */ |
| 2408 | int |
| 2409 | vfs_mountedon(vp) |
| 2410 | struct vnode *vp; |
| 2411 | { |
| 2412 | |
| 2413 | if (vp->v_specmountpoint != NULL) |
| 2414 | return (EBUSY); |
| 2415 | return (0); |
| 2416 | } |
| 2417 | |
| 2418 | /* |
| 2419 | * Unmount all filesystems. The list is traversed in reverse order |
| 2420 | * of mounting to avoid dependencies. |
| 2421 | */ |
| 2422 | void |
| 2423 | vfs_unmountall() |
| 2424 | { |
| 2425 | struct mount *mp; |
| 2426 | struct thread *td = curthread; |
| 2427 | int error; |
| 2428 | |
| 2429 | if (td->td_proc == NULL) |
| 2430 | td = initproc->p_thread; /* XXX XXX use proc0 instead? */ |
| 2431 | |
| 2432 | /* |
| 2433 | * Since this only runs when rebooting, it is not interlocked. |
| 2434 | */ |
| 2435 | while(!TAILQ_EMPTY(&mountlist)) { |
| 2436 | mp = TAILQ_LAST(&mountlist, mntlist); |
| 2437 | error = dounmount(mp, MNT_FORCE, td); |
| 2438 | if (error) { |
| 2439 | TAILQ_REMOVE(&mountlist, mp, mnt_list); |
| 2440 | printf("unmount of %s failed (", |
| 2441 | mp->mnt_stat.f_mntonname); |
| 2442 | if (error == EBUSY) |
| 2443 | printf("BUSY)\n"); |
| 2444 | else |
| 2445 | printf("%d)\n", error); |
| 2446 | } else { |
| 2447 | /* The unmount has removed mp from the mountlist */ |
| 2448 | } |
| 2449 | } |
| 2450 | } |
| 2451 | |
| 2452 | /* |
| 2453 | * Build hash lists of net addresses and hang them off the mount point. |
| 2454 | * Called by ufs_mount() to set up the lists of export addresses. |
| 2455 | */ |
| 2456 | static int |
| 2457 | vfs_hang_addrlist(mp, nep, argp) |
| 2458 | struct mount *mp; |
| 2459 | struct netexport *nep; |
| 2460 | struct export_args *argp; |
| 2461 | { |
| 2462 | struct netcred *np; |
| 2463 | struct radix_node_head *rnh; |
| 2464 | int i; |
| 2465 | struct radix_node *rn; |
| 2466 | struct sockaddr *saddr, *smask = 0; |
| 2467 | struct domain *dom; |
| 2468 | int error; |
| 2469 | |
| 2470 | if (argp->ex_addrlen == 0) { |
| 2471 | if (mp->mnt_flag & MNT_DEFEXPORTED) |
| 2472 | return (EPERM); |
| 2473 | np = &nep->ne_defexported; |
| 2474 | np->netc_exflags = argp->ex_flags; |
| 2475 | np->netc_anon = argp->ex_anon; |
| 2476 | np->netc_anon.cr_ref = 1; |
| 2477 | mp->mnt_flag |= MNT_DEFEXPORTED; |
| 2478 | return (0); |
| 2479 | } |
| 2480 | |
| 2481 | if (argp->ex_addrlen < 0 || argp->ex_addrlen > MLEN) |
| 2482 | return (EINVAL); |
| 2483 | if (argp->ex_masklen < 0 || argp->ex_masklen > MLEN) |
| 2484 | return (EINVAL); |
| 2485 | |
| 2486 | i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen; |
| 2487 | np = (struct netcred *) malloc(i, M_NETADDR, M_WAITOK); |
| 2488 | bzero((caddr_t) np, i); |
| 2489 | saddr = (struct sockaddr *) (np + 1); |
| 2490 | if ((error = copyin(argp->ex_addr, (caddr_t) saddr, argp->ex_addrlen))) |
| 2491 | goto out; |
| 2492 | if (saddr->sa_len > argp->ex_addrlen) |
| 2493 | saddr->sa_len = argp->ex_addrlen; |
| 2494 | if (argp->ex_masklen) { |
| 2495 | smask = (struct sockaddr *) ((caddr_t) saddr + argp->ex_addrlen); |
| 2496 | error = copyin(argp->ex_mask, (caddr_t) smask, argp->ex_masklen); |
| 2497 | if (error) |
| 2498 | goto out; |
| 2499 | if (smask->sa_len > argp->ex_masklen) |
| 2500 | smask->sa_len = argp->ex_masklen; |
| 2501 | } |
| 2502 | i = saddr->sa_family; |
| 2503 | if ((rnh = nep->ne_rtable[i]) == 0) { |
| 2504 | /* |
| 2505 | * Seems silly to initialize every AF when most are not used, |
| 2506 | * do so on demand here |
| 2507 | */ |
| 2508 | for (dom = domains; dom; dom = dom->dom_next) |
| 2509 | if (dom->dom_family == i && dom->dom_rtattach) { |
| 2510 | dom->dom_rtattach((void **) &nep->ne_rtable[i], |
| 2511 | dom->dom_rtoffset); |
| 2512 | break; |
| 2513 | } |
| 2514 | if ((rnh = nep->ne_rtable[i]) == 0) { |
| 2515 | error = ENOBUFS; |
| 2516 | goto out; |
| 2517 | } |
| 2518 | } |
| 2519 | rn = (*rnh->rnh_addaddr) ((caddr_t) saddr, (caddr_t) smask, rnh, |
| 2520 | np->netc_rnodes); |
| 2521 | if (rn == 0 || np != (struct netcred *) rn) { /* already exists */ |
| 2522 | error = EPERM; |
| 2523 | goto out; |
| 2524 | } |
| 2525 | np->netc_exflags = argp->ex_flags; |
| 2526 | np->netc_anon = argp->ex_anon; |
| 2527 | np->netc_anon.cr_ref = 1; |
| 2528 | return (0); |
| 2529 | out: |
| 2530 | free(np, M_NETADDR); |
| 2531 | return (error); |
| 2532 | } |
| 2533 | |
| 2534 | /* ARGSUSED */ |
| 2535 | static int |
| 2536 | vfs_free_netcred(rn, w) |
| 2537 | struct radix_node *rn; |
| 2538 | void *w; |
| 2539 | { |
| 2540 | struct radix_node_head *rnh = (struct radix_node_head *) w; |
| 2541 | |
| 2542 | (*rnh->rnh_deladdr) (rn->rn_key, rn->rn_mask, rnh); |
| 2543 | free((caddr_t) rn, M_NETADDR); |
| 2544 | return (0); |
| 2545 | } |
| 2546 | |
| 2547 | /* |
| 2548 | * Free the net address hash lists that are hanging off the mount points. |
| 2549 | */ |
| 2550 | static void |
| 2551 | vfs_free_addrlist(nep) |
| 2552 | struct netexport *nep; |
| 2553 | { |
| 2554 | int i; |
| 2555 | struct radix_node_head *rnh; |
| 2556 | |
| 2557 | for (i = 0; i <= AF_MAX; i++) |
| 2558 | if ((rnh = nep->ne_rtable[i])) { |
| 2559 | (*rnh->rnh_walktree) (rnh, vfs_free_netcred, |
| 2560 | (caddr_t) rnh); |
| 2561 | free((caddr_t) rnh, M_RTABLE); |
| 2562 | nep->ne_rtable[i] = 0; |
| 2563 | } |
| 2564 | } |
| 2565 | |
| 2566 | int |
| 2567 | vfs_export(mp, nep, argp) |
| 2568 | struct mount *mp; |
| 2569 | struct netexport *nep; |
| 2570 | struct export_args *argp; |
| 2571 | { |
| 2572 | int error; |
| 2573 | |
| 2574 | if (argp->ex_flags & MNT_DELEXPORT) { |
| 2575 | if (mp->mnt_flag & MNT_EXPUBLIC) { |
| 2576 | vfs_setpublicfs(NULL, NULL, NULL); |
| 2577 | mp->mnt_flag &= ~MNT_EXPUBLIC; |
| 2578 | } |
| 2579 | vfs_free_addrlist(nep); |
| 2580 | mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED); |
| 2581 | } |
| 2582 | if (argp->ex_flags & MNT_EXPORTED) { |
| 2583 | if (argp->ex_flags & MNT_EXPUBLIC) { |
| 2584 | if ((error = vfs_setpublicfs(mp, nep, argp)) != 0) |
| 2585 | return (error); |
| 2586 | mp->mnt_flag |= MNT_EXPUBLIC; |
| 2587 | } |
| 2588 | if ((error = vfs_hang_addrlist(mp, nep, argp))) |
| 2589 | return (error); |
| 2590 | mp->mnt_flag |= MNT_EXPORTED; |
| 2591 | } |
| 2592 | return (0); |
| 2593 | } |
| 2594 | |
| 2595 | |
| 2596 | /* |
| 2597 | * Set the publicly exported filesystem (WebNFS). Currently, only |
| 2598 | * one public filesystem is possible in the spec (RFC 2054 and 2055) |
| 2599 | */ |
| 2600 | int |
| 2601 | vfs_setpublicfs(mp, nep, argp) |
| 2602 | struct mount *mp; |
| 2603 | struct netexport *nep; |
| 2604 | struct export_args *argp; |
| 2605 | { |
| 2606 | int error; |
| 2607 | struct vnode *rvp; |
| 2608 | char *cp; |
| 2609 | |
| 2610 | /* |
| 2611 | * mp == NULL -> invalidate the current info, the FS is |
| 2612 | * no longer exported. May be called from either vfs_export |
| 2613 | * or unmount, so check if it hasn't already been done. |
| 2614 | */ |
| 2615 | if (mp == NULL) { |
| 2616 | if (nfs_pub.np_valid) { |
| 2617 | nfs_pub.np_valid = 0; |
| 2618 | if (nfs_pub.np_index != NULL) { |
| 2619 | FREE(nfs_pub.np_index, M_TEMP); |
| 2620 | nfs_pub.np_index = NULL; |
| 2621 | } |
| 2622 | } |
| 2623 | return (0); |
| 2624 | } |
| 2625 | |
| 2626 | /* |
| 2627 | * Only one allowed at a time. |
| 2628 | */ |
| 2629 | if (nfs_pub.np_valid != 0 && mp != nfs_pub.np_mount) |
| 2630 | return (EBUSY); |
| 2631 | |
| 2632 | /* |
| 2633 | * Get real filehandle for root of exported FS. |
| 2634 | */ |
| 2635 | bzero((caddr_t)&nfs_pub.np_handle, sizeof(nfs_pub.np_handle)); |
| 2636 | nfs_pub.np_handle.fh_fsid = mp->mnt_stat.f_fsid; |
| 2637 | |
| 2638 | if ((error = VFS_ROOT(mp, &rvp))) |
| 2639 | return (error); |
| 2640 | |
| 2641 | if ((error = VFS_VPTOFH(rvp, &nfs_pub.np_handle.fh_fid))) |
| 2642 | return (error); |
| 2643 | |
| 2644 | vput(rvp); |
| 2645 | |
| 2646 | /* |
| 2647 | * If an indexfile was specified, pull it in. |
| 2648 | */ |
| 2649 | if (argp->ex_indexfile != NULL) { |
| 2650 | MALLOC(nfs_pub.np_index, char *, MAXNAMLEN + 1, M_TEMP, |
| 2651 | M_WAITOK); |
| 2652 | error = copyinstr(argp->ex_indexfile, nfs_pub.np_index, |
| 2653 | MAXNAMLEN, (size_t *)0); |
| 2654 | if (!error) { |
| 2655 | /* |
| 2656 | * Check for illegal filenames. |
| 2657 | */ |
| 2658 | for (cp = nfs_pub.np_index; *cp; cp++) { |
| 2659 | if (*cp == '/') { |
| 2660 | error = EINVAL; |
| 2661 | break; |
| 2662 | } |
| 2663 | } |
| 2664 | } |
| 2665 | if (error) { |
| 2666 | FREE(nfs_pub.np_index, M_TEMP); |
| 2667 | return (error); |
| 2668 | } |
| 2669 | } |
| 2670 | |
| 2671 | nfs_pub.np_mount = mp; |
| 2672 | nfs_pub.np_valid = 1; |
| 2673 | return (0); |
| 2674 | } |
| 2675 | |
| 2676 | struct netcred * |
| 2677 | vfs_export_lookup(mp, nep, nam) |
| 2678 | struct mount *mp; |
| 2679 | struct netexport *nep; |
| 2680 | struct sockaddr *nam; |
| 2681 | { |
| 2682 | struct netcred *np; |
| 2683 | struct radix_node_head *rnh; |
| 2684 | struct sockaddr *saddr; |
| 2685 | |
| 2686 | np = NULL; |
| 2687 | if (mp->mnt_flag & MNT_EXPORTED) { |
| 2688 | /* |
| 2689 | * Lookup in the export list first. |
| 2690 | */ |
| 2691 | if (nam != NULL) { |
| 2692 | saddr = nam; |
| 2693 | rnh = nep->ne_rtable[saddr->sa_family]; |
| 2694 | if (rnh != NULL) { |
| 2695 | np = (struct netcred *) |
| 2696 | (*rnh->rnh_matchaddr)((caddr_t)saddr, |
| 2697 | rnh); |
| 2698 | if (np && np->netc_rnodes->rn_flags & RNF_ROOT) |
| 2699 | np = NULL; |
| 2700 | } |
| 2701 | } |
| 2702 | /* |
| 2703 | * If no address match, use the default if it exists. |
| 2704 | */ |
| 2705 | if (np == NULL && mp->mnt_flag & MNT_DEFEXPORTED) |
| 2706 | np = &nep->ne_defexported; |
| 2707 | } |
| 2708 | return (np); |
| 2709 | } |
| 2710 | |
| 2711 | /* |
| 2712 | * perform msync on all vnodes under a mount point |
| 2713 | * the mount point must be locked. |
| 2714 | */ |
| 2715 | void |
| 2716 | vfs_msync(struct mount *mp, int flags) |
| 2717 | { |
| 2718 | struct thread *td = curthread; /* XXX */ |
| 2719 | struct vnode *vp, *nvp; |
| 2720 | struct vm_object *obj; |
| 2721 | int tries; |
| 2722 | |
| 2723 | tries = 5; |
| 2724 | lwkt_gettoken(&mntvnode_token); |
| 2725 | loop: |
| 2726 | for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist); vp != NULL; vp = nvp) { |
| 2727 | if (vp->v_mount != mp) { |
| 2728 | if (--tries > 0) |
| 2729 | goto loop; |
| 2730 | break; |
| 2731 | } |
| 2732 | nvp = TAILQ_NEXT(vp, v_nmntvnodes); |
| 2733 | |
| 2734 | if (vp->v_flag & VXLOCK) /* XXX: what if MNT_WAIT? */ |
| 2735 | continue; |
| 2736 | |
| 2737 | /* |
| 2738 | * There could be hundreds of thousands of vnodes, we cannot |
| 2739 | * afford to do anything heavy-weight until we have a fairly |
| 2740 | * good indication that there is something to do. |
| 2741 | */ |
| 2742 | if ((vp->v_flag & VOBJDIRTY) && |
| 2743 | (flags == MNT_WAIT || VOP_ISLOCKED(vp, NULL) == 0)) { |
| 2744 | lwkt_reltoken(&mntvnode_token); |
| 2745 | if (!vget(vp, |
| 2746 | LK_EXCLUSIVE | LK_RETRY | LK_NOOBJ, td)) { |
| 2747 | if (VOP_GETVOBJECT(vp, &obj) == 0) { |
| 2748 | vm_object_page_clean(obj, 0, 0, flags == MNT_WAIT ? OBJPC_SYNC : OBJPC_NOSYNC); |
| 2749 | } |
| 2750 | vput(vp); |
| 2751 | } |
| 2752 | lwkt_gettoken(&mntvnode_token); |
| 2753 | if (TAILQ_NEXT(vp, v_nmntvnodes) != nvp) { |
| 2754 | if (--tries > 0) |
| 2755 | goto loop; |
| 2756 | break; |
| 2757 | } |
| 2758 | } |
| 2759 | } |
| 2760 | lwkt_reltoken(&mntvnode_token); |
| 2761 | } |
| 2762 | |
| 2763 | /* |
| 2764 | * Create the VM object needed for VMIO and mmap support. This |
| 2765 | * is done for all VREG files in the system. Some filesystems might |
| 2766 | * afford the additional metadata buffering capability of the |
| 2767 | * VMIO code by making the device node be VMIO mode also. |
| 2768 | * |
| 2769 | * vp must be locked when vfs_object_create is called. |
| 2770 | */ |
| 2771 | int |
| 2772 | vfs_object_create(struct vnode *vp, struct thread *td) |
| 2773 | { |
| 2774 | return (VOP_CREATEVOBJECT(vp, td)); |
| 2775 | } |
| 2776 | |
| 2777 | void |
| 2778 | vfree(vp) |
| 2779 | struct vnode *vp; |
| 2780 | { |
| 2781 | int s; |
| 2782 | |
| 2783 | s = splbio(); |
| 2784 | lwkt_gettoken(&vnode_free_list_token); |
| 2785 | KASSERT((vp->v_flag & VFREE) == 0, ("vnode already free")); |
| 2786 | if (vp->v_flag & VAGE) { |
| 2787 | TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist); |
| 2788 | } else { |
| 2789 | TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist); |
| 2790 | } |
| 2791 | freevnodes++; |
| 2792 | lwkt_reltoken(&vnode_free_list_token); |
| 2793 | vp->v_flag &= ~VAGE; |
| 2794 | vp->v_flag |= VFREE; |
| 2795 | splx(s); |
| 2796 | } |
| 2797 | |
| 2798 | void |
| 2799 | vbusy(vp) |
| 2800 | struct vnode *vp; |
| 2801 | { |
| 2802 | int s; |
| 2803 | |
| 2804 | s = splbio(); |
| 2805 | lwkt_gettoken(&vnode_free_list_token); |
| 2806 | KASSERT((vp->v_flag & VFREE) != 0, ("vnode not free")); |
| 2807 | TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); |
| 2808 | freevnodes--; |
| 2809 | lwkt_reltoken(&vnode_free_list_token); |
| 2810 | vp->v_flag &= ~(VFREE|VAGE); |
| 2811 | splx(s); |
| 2812 | } |
| 2813 | |
| 2814 | /* |
| 2815 | * Record a process's interest in events which might happen to |
| 2816 | * a vnode. Because poll uses the historic select-style interface |
| 2817 | * internally, this routine serves as both the ``check for any |
| 2818 | * pending events'' and the ``record my interest in future events'' |
| 2819 | * functions. (These are done together, while the lock is held, |
| 2820 | * to avoid race conditions.) |
| 2821 | */ |
| 2822 | int |
| 2823 | vn_pollrecord(struct vnode *vp, struct thread *td, int events) |
| 2824 | { |
| 2825 | lwkt_gettoken(&vp->v_pollinfo.vpi_token); |
| 2826 | if (vp->v_pollinfo.vpi_revents & events) { |
| 2827 | /* |
| 2828 | * This leaves events we are not interested |
| 2829 | * in available for the other process which |
| 2830 | * which presumably had requested them |
| 2831 | * (otherwise they would never have been |
| 2832 | * recorded). |
| 2833 | */ |
| 2834 | events &= vp->v_pollinfo.vpi_revents; |
| 2835 | vp->v_pollinfo.vpi_revents &= ~events; |
| 2836 | |
| 2837 | lwkt_reltoken(&vp->v_pollinfo.vpi_token); |
| 2838 | return events; |
| 2839 | } |
| 2840 | vp->v_pollinfo.vpi_events |= events; |
| 2841 | selrecord(td, &vp->v_pollinfo.vpi_selinfo); |
| 2842 | lwkt_reltoken(&vp->v_pollinfo.vpi_token); |
| 2843 | return 0; |
| 2844 | } |
| 2845 | |
| 2846 | /* |
| 2847 | * Note the occurrence of an event. If the VN_POLLEVENT macro is used, |
| 2848 | * it is possible for us to miss an event due to race conditions, but |
| 2849 | * that condition is expected to be rare, so for the moment it is the |
| 2850 | * preferred interface. |
| 2851 | */ |
| 2852 | void |
| 2853 | vn_pollevent(vp, events) |
| 2854 | struct vnode *vp; |
| 2855 | short events; |
| 2856 | { |
| 2857 | lwkt_gettoken(&vp->v_pollinfo.vpi_token); |
| 2858 | if (vp->v_pollinfo.vpi_events & events) { |
| 2859 | /* |
| 2860 | * We clear vpi_events so that we don't |
| 2861 | * call selwakeup() twice if two events are |
| 2862 | * posted before the polling process(es) is |
| 2863 | * awakened. This also ensures that we take at |
| 2864 | * most one selwakeup() if the polling process |
| 2865 | * is no longer interested. However, it does |
| 2866 | * mean that only one event can be noticed at |
| 2867 | * a time. (Perhaps we should only clear those |
| 2868 | * event bits which we note?) XXX |
| 2869 | */ |
| 2870 | vp->v_pollinfo.vpi_events = 0; /* &= ~events ??? */ |
| 2871 | vp->v_pollinfo.vpi_revents |= events; |
| 2872 | selwakeup(&vp->v_pollinfo.vpi_selinfo); |
| 2873 | } |
| 2874 | lwkt_reltoken(&vp->v_pollinfo.vpi_token); |
| 2875 | } |
| 2876 | |
| 2877 | /* |
| 2878 | * Wake up anyone polling on vp because it is being revoked. |
| 2879 | * This depends on dead_poll() returning POLLHUP for correct |
| 2880 | * behavior. |
| 2881 | */ |
| 2882 | void |
| 2883 | vn_pollgone(vp) |
| 2884 | struct vnode *vp; |
| 2885 | { |
| 2886 | lwkt_gettoken(&vp->v_pollinfo.vpi_token); |
| 2887 | if (vp->v_pollinfo.vpi_events) { |
| 2888 | vp->v_pollinfo.vpi_events = 0; |
| 2889 | selwakeup(&vp->v_pollinfo.vpi_selinfo); |
| 2890 | } |
| 2891 | lwkt_reltoken(&vp->v_pollinfo.vpi_token); |
| 2892 | } |
| 2893 | |
| 2894 | |
| 2895 | |
| 2896 | /* |
| 2897 | * Routine to create and manage a filesystem syncer vnode. |
| 2898 | */ |
| 2899 | #define sync_close ((int (*) __P((struct vop_close_args *)))nullop) |
| 2900 | static int sync_fsync __P((struct vop_fsync_args *)); |
| 2901 | static int sync_inactive __P((struct vop_inactive_args *)); |
| 2902 | static int sync_reclaim __P((struct vop_reclaim_args *)); |
| 2903 | #define sync_lock ((int (*) __P((struct vop_lock_args *)))vop_nolock) |
| 2904 | #define sync_unlock ((int (*) __P((struct vop_unlock_args *)))vop_nounlock) |
| 2905 | static int sync_print __P((struct vop_print_args *)); |
| 2906 | #define sync_islocked ((int(*) __P((struct vop_islocked_args *)))vop_noislocked) |
| 2907 | |
| 2908 | static vop_t **sync_vnodeop_p; |
| 2909 | static struct vnodeopv_entry_desc sync_vnodeop_entries[] = { |
| 2910 | { &vop_default_desc, (vop_t *) vop_eopnotsupp }, |
| 2911 | { &vop_close_desc, (vop_t *) sync_close }, /* close */ |
| 2912 | { &vop_fsync_desc, (vop_t *) sync_fsync }, /* fsync */ |
| 2913 | { &vop_inactive_desc, (vop_t *) sync_inactive }, /* inactive */ |
| 2914 | { &vop_reclaim_desc, (vop_t *) sync_reclaim }, /* reclaim */ |
| 2915 | { &vop_lock_desc, (vop_t *) sync_lock }, /* lock */ |
| 2916 | { &vop_unlock_desc, (vop_t *) sync_unlock }, /* unlock */ |
| 2917 | { &vop_print_desc, (vop_t *) sync_print }, /* print */ |
| 2918 | { &vop_islocked_desc, (vop_t *) sync_islocked }, /* islocked */ |
| 2919 | { NULL, NULL } |
| 2920 | }; |
| 2921 | static struct vnodeopv_desc sync_vnodeop_opv_desc = |
| 2922 | { &sync_vnodeop_p, sync_vnodeop_entries }; |
| 2923 | |
| 2924 | VNODEOP_SET(sync_vnodeop_opv_desc); |
| 2925 | |
| 2926 | /* |
| 2927 | * Create a new filesystem syncer vnode for the specified mount point. |
| 2928 | */ |
| 2929 | int |
| 2930 | vfs_allocate_syncvnode(mp) |
| 2931 | struct mount *mp; |
| 2932 | { |
| 2933 | struct vnode *vp; |
| 2934 | static long start, incr, next; |
| 2935 | int error; |
| 2936 | |
| 2937 | /* Allocate a new vnode */ |
| 2938 | if ((error = getnewvnode(VT_VFS, mp, sync_vnodeop_p, &vp)) != 0) { |
| 2939 | mp->mnt_syncer = NULL; |
| 2940 | return (error); |
| 2941 | } |
| 2942 | vp->v_type = VNON; |
| 2943 | /* |
| 2944 | * Place the vnode onto the syncer worklist. We attempt to |
| 2945 | * scatter them about on the list so that they will go off |
| 2946 | * at evenly distributed times even if all the filesystems |
| 2947 | * are mounted at once. |
| 2948 | */ |
| 2949 | next += incr; |
| 2950 | if (next == 0 || next > syncer_maxdelay) { |
| 2951 | start /= 2; |
| 2952 | incr /= 2; |
| 2953 | if (start == 0) { |
| 2954 | start = syncer_maxdelay / 2; |
| 2955 | incr = syncer_maxdelay; |
| 2956 | } |
| 2957 | next = start; |
| 2958 | } |
| 2959 | vn_syncer_add_to_worklist(vp, syncdelay > 0 ? next % syncdelay : 0); |
| 2960 | mp->mnt_syncer = vp; |
| 2961 | return (0); |
| 2962 | } |
| 2963 | |
| 2964 | /* |
| 2965 | * Do a lazy sync of the filesystem. |
| 2966 | */ |
| 2967 | static int |
| 2968 | sync_fsync(ap) |
| 2969 | struct vop_fsync_args /* { |
| 2970 | struct vnode *a_vp; |
| 2971 | struct ucred *a_cred; |
| 2972 | int a_waitfor; |
| 2973 | struct thread *a_td; |
| 2974 | } */ *ap; |
| 2975 | { |
| 2976 | struct vnode *syncvp = ap->a_vp; |
| 2977 | struct mount *mp = syncvp->v_mount; |
| 2978 | struct thread *td = ap->a_td; |
| 2979 | int asyncflag; |
| 2980 | |
| 2981 | /* |
| 2982 | * We only need to do something if this is a lazy evaluation. |
| 2983 | */ |
| 2984 | if (ap->a_waitfor != MNT_LAZY) |
| 2985 | return (0); |
| 2986 | |
| 2987 | /* |
| 2988 | * Move ourselves to the back of the sync list. |
| 2989 | */ |
| 2990 | vn_syncer_add_to_worklist(syncvp, syncdelay); |
| 2991 | |
| 2992 | /* |
| 2993 | * Walk the list of vnodes pushing all that are dirty and |
| 2994 | * not already on the sync list. |
| 2995 | */ |
| 2996 | lwkt_gettoken(&mountlist_token); |
| 2997 | if (vfs_busy(mp, LK_EXCLUSIVE | LK_NOWAIT, &mountlist_token, td) != 0) { |
| 2998 | lwkt_reltoken(&mountlist_token); |
| 2999 | return (0); |
| 3000 | } |
| 3001 | asyncflag = mp->mnt_flag & MNT_ASYNC; |
| 3002 | mp->mnt_flag &= ~MNT_ASYNC; |
| 3003 | vfs_msync(mp, MNT_NOWAIT); |
| 3004 | VFS_SYNC(mp, MNT_LAZY, td); |
| 3005 | if (asyncflag) |
| 3006 | mp->mnt_flag |= MNT_ASYNC; |
| 3007 | vfs_unbusy(mp, td); |
| 3008 | return (0); |
| 3009 | } |
| 3010 | |
| 3011 | /* |
| 3012 | * The syncer vnode is no referenced. |
| 3013 | */ |
| 3014 | static int |
| 3015 | sync_inactive(ap) |
| 3016 | struct vop_inactive_args /* { |
| 3017 | struct vnode *a_vp; |
| 3018 | struct proc *a_p; |
| 3019 | } */ *ap; |
| 3020 | { |
| 3021 | |
| 3022 | vgone(ap->a_vp); |
| 3023 | return (0); |
| 3024 | } |
| 3025 | |
| 3026 | /* |
| 3027 | * The syncer vnode is no longer needed and is being decommissioned. |
| 3028 | * |
| 3029 | * Modifications to the worklist must be protected at splbio(). |
| 3030 | */ |
| 3031 | static int |
| 3032 | sync_reclaim(ap) |
| 3033 | struct vop_reclaim_args /* { |
| 3034 | struct vnode *a_vp; |
| 3035 | } */ *ap; |
| 3036 | { |
| 3037 | struct vnode *vp = ap->a_vp; |
| 3038 | int s; |
| 3039 | |
| 3040 | s = splbio(); |
| 3041 | vp->v_mount->mnt_syncer = NULL; |
| 3042 | if (vp->v_flag & VONWORKLST) { |
| 3043 | LIST_REMOVE(vp, v_synclist); |
| 3044 | vp->v_flag &= ~VONWORKLST; |
| 3045 | } |
| 3046 | splx(s); |
| 3047 | |
| 3048 | return (0); |
| 3049 | } |
| 3050 | |
| 3051 | /* |
| 3052 | * Print out a syncer vnode. |
| 3053 | */ |
| 3054 | static int |
| 3055 | sync_print(ap) |
| 3056 | struct vop_print_args /* { |
| 3057 | struct vnode *a_vp; |
| 3058 | } */ *ap; |
| 3059 | { |
| 3060 | struct vnode *vp = ap->a_vp; |
| 3061 | |
| 3062 | printf("syncer vnode"); |
| 3063 | if (vp->v_vnlock != NULL) |
| 3064 | lockmgr_printinfo(vp->v_vnlock); |
| 3065 | printf("\n"); |
| 3066 | return (0); |
| 3067 | } |
| 3068 | |
| 3069 | /* |
| 3070 | * extract the dev_t from a VBLK or VCHR |
| 3071 | */ |
| 3072 | dev_t |
| 3073 | vn_todev(vp) |
| 3074 | struct vnode *vp; |
| 3075 | { |
| 3076 | if (vp->v_type != VBLK && vp->v_type != VCHR) |
| 3077 | return (NODEV); |
| 3078 | return (vp->v_rdev); |
| 3079 | } |
| 3080 | |
| 3081 | /* |
| 3082 | * Check if vnode represents a disk device |
| 3083 | */ |
| 3084 | int |
| 3085 | vn_isdisk(vp, errp) |
| 3086 | struct vnode *vp; |
| 3087 | int *errp; |
| 3088 | { |
| 3089 | if (vp->v_type != VBLK && vp->v_type != VCHR) { |
| 3090 | if (errp != NULL) |
| 3091 | *errp = ENOTBLK; |
| 3092 | return (0); |
| 3093 | } |
| 3094 | if (vp->v_rdev == NULL) { |
| 3095 | if (errp != NULL) |
| 3096 | *errp = ENXIO; |
| 3097 | return (0); |
| 3098 | } |
| 3099 | if (!dev_dport(vp->v_rdev)) { |
| 3100 | if (errp != NULL) |
| 3101 | *errp = ENXIO; |
| 3102 | return (0); |
| 3103 | } |
| 3104 | if (!(dev_dflags(vp->v_rdev) & D_DISK)) { |
| 3105 | if (errp != NULL) |
| 3106 | *errp = ENOTBLK; |
| 3107 | return (0); |
| 3108 | } |
| 3109 | if (errp != NULL) |
| 3110 | *errp = 0; |
| 3111 | return (1); |
| 3112 | } |
| 3113 | |
| 3114 | void |
| 3115 | NDFREE(ndp, flags) |
| 3116 | struct nameidata *ndp; |
| 3117 | const uint flags; |
| 3118 | { |
| 3119 | if (!(flags & NDF_NO_FREE_PNBUF) && |
| 3120 | (ndp->ni_cnd.cn_flags & HASBUF)) { |
| 3121 | zfree(namei_zone, ndp->ni_cnd.cn_pnbuf); |
| 3122 | ndp->ni_cnd.cn_flags &= ~HASBUF; |
| 3123 | } |
| 3124 | if (!(flags & NDF_NO_DVP_UNLOCK) && |
| 3125 | (ndp->ni_cnd.cn_flags & LOCKPARENT) && |
| 3126 | ndp->ni_dvp != ndp->ni_vp) |
| 3127 | VOP_UNLOCK(ndp->ni_dvp, 0, ndp->ni_cnd.cn_td); |
| 3128 | if (!(flags & NDF_NO_DVP_RELE) && |
| 3129 | (ndp->ni_cnd.cn_flags & (LOCKPARENT|WANTPARENT))) { |
| 3130 | vrele(ndp->ni_dvp); |
| 3131 | ndp->ni_dvp = NULL; |
| 3132 | } |
| 3133 | if (!(flags & NDF_NO_VP_UNLOCK) && |
| 3134 | (ndp->ni_cnd.cn_flags & LOCKLEAF) && ndp->ni_vp) |
| 3135 | VOP_UNLOCK(ndp->ni_vp, 0, ndp->ni_cnd.cn_td); |
| 3136 | if (!(flags & NDF_NO_VP_RELE) && |
| 3137 | ndp->ni_vp) { |
| 3138 | vrele(ndp->ni_vp); |
| 3139 | ndp->ni_vp = NULL; |
| 3140 | } |
| 3141 | if (!(flags & NDF_NO_STARTDIR_RELE) && |
| 3142 | (ndp->ni_cnd.cn_flags & SAVESTART)) { |
| 3143 | vrele(ndp->ni_startdir); |
| 3144 | ndp->ni_startdir = NULL; |
| 3145 | } |
| 3146 | } |