| 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 1.33 2004/06/15 00:30:53 dillon 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/vm_kern.h> |
| 77 | #include <vm/pmap.h> |
| 78 | #include <vm/vm_map.h> |
| 79 | #include <vm/vm_page.h> |
| 80 | #include <vm/vm_pager.h> |
| 81 | #include <vm/vnode_pager.h> |
| 82 | #include <vm/vm_zone.h> |
| 83 | |
| 84 | #include <sys/buf2.h> |
| 85 | #include <sys/thread2.h> |
| 86 | |
| 87 | static MALLOC_DEFINE(M_NETADDR, "Export Host", "Export host address structure"); |
| 88 | |
| 89 | static void insmntque (struct vnode *vp, struct mount *mp); |
| 90 | static void vclean (struct vnode *vp, lwkt_tokref_t vlock, |
| 91 | int flags, struct thread *td); |
| 92 | |
| 93 | static unsigned long numvnodes; |
| 94 | SYSCTL_INT(_debug, OID_AUTO, numvnodes, CTLFLAG_RD, &numvnodes, 0, ""); |
| 95 | |
| 96 | enum vtype iftovt_tab[16] = { |
| 97 | VNON, VFIFO, VCHR, VNON, VDIR, VNON, VBLK, VNON, |
| 98 | VREG, VNON, VLNK, VNON, VSOCK, VNON, VNON, VBAD, |
| 99 | }; |
| 100 | int vttoif_tab[9] = { |
| 101 | 0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK, |
| 102 | S_IFSOCK, S_IFIFO, S_IFMT, |
| 103 | }; |
| 104 | |
| 105 | static TAILQ_HEAD(freelst, vnode) vnode_free_list; /* vnode free list */ |
| 106 | |
| 107 | static u_long wantfreevnodes = 25; |
| 108 | SYSCTL_INT(_debug, OID_AUTO, wantfreevnodes, CTLFLAG_RW, |
| 109 | &wantfreevnodes, 0, ""); |
| 110 | static u_long freevnodes = 0; |
| 111 | SYSCTL_INT(_debug, OID_AUTO, freevnodes, CTLFLAG_RD, |
| 112 | &freevnodes, 0, ""); |
| 113 | |
| 114 | static int reassignbufcalls; |
| 115 | SYSCTL_INT(_vfs, OID_AUTO, reassignbufcalls, CTLFLAG_RW, |
| 116 | &reassignbufcalls, 0, ""); |
| 117 | static int reassignbufloops; |
| 118 | SYSCTL_INT(_vfs, OID_AUTO, reassignbufloops, CTLFLAG_RW, |
| 119 | &reassignbufloops, 0, ""); |
| 120 | static int reassignbufsortgood; |
| 121 | SYSCTL_INT(_vfs, OID_AUTO, reassignbufsortgood, CTLFLAG_RW, |
| 122 | &reassignbufsortgood, 0, ""); |
| 123 | static int reassignbufsortbad; |
| 124 | SYSCTL_INT(_vfs, OID_AUTO, reassignbufsortbad, CTLFLAG_RW, |
| 125 | &reassignbufsortbad, 0, ""); |
| 126 | static int reassignbufmethod = 1; |
| 127 | SYSCTL_INT(_vfs, OID_AUTO, reassignbufmethod, CTLFLAG_RW, |
| 128 | &reassignbufmethod, 0, ""); |
| 129 | |
| 130 | #ifdef ENABLE_VFS_IOOPT |
| 131 | int vfs_ioopt = 0; |
| 132 | SYSCTL_INT(_vfs, OID_AUTO, ioopt, CTLFLAG_RW, &vfs_ioopt, 0, ""); |
| 133 | #endif |
| 134 | |
| 135 | struct mntlist mountlist = TAILQ_HEAD_INITIALIZER(mountlist); /* mounted fs */ |
| 136 | struct lwkt_token mountlist_token; |
| 137 | struct lwkt_token mntvnode_token; |
| 138 | int nfs_mount_type = -1; |
| 139 | static struct lwkt_token mntid_token; |
| 140 | static struct lwkt_token vnode_free_list_token; |
| 141 | static struct lwkt_token spechash_token; |
| 142 | struct nfs_public nfs_pub; /* publicly exported FS */ |
| 143 | static vm_zone_t vnode_zone; |
| 144 | |
| 145 | /* |
| 146 | * The workitem queue. |
| 147 | */ |
| 148 | #define SYNCER_MAXDELAY 32 |
| 149 | static int syncer_maxdelay = SYNCER_MAXDELAY; /* maximum delay time */ |
| 150 | time_t syncdelay = 30; /* max time to delay syncing data */ |
| 151 | SYSCTL_INT(_kern, OID_AUTO, syncdelay, CTLFLAG_RW, |
| 152 | &syncdelay, 0, "VFS data synchronization delay"); |
| 153 | time_t filedelay = 30; /* time to delay syncing files */ |
| 154 | SYSCTL_INT(_kern, OID_AUTO, filedelay, CTLFLAG_RW, |
| 155 | &filedelay, 0, "File synchronization delay"); |
| 156 | time_t dirdelay = 29; /* time to delay syncing directories */ |
| 157 | SYSCTL_INT(_kern, OID_AUTO, dirdelay, CTLFLAG_RW, |
| 158 | &dirdelay, 0, "Directory synchronization delay"); |
| 159 | time_t metadelay = 28; /* time to delay syncing metadata */ |
| 160 | SYSCTL_INT(_kern, OID_AUTO, metadelay, CTLFLAG_RW, |
| 161 | &metadelay, 0, "VFS metadata synchronization delay"); |
| 162 | static int rushjob; /* number of slots to run ASAP */ |
| 163 | static int stat_rush_requests; /* number of times I/O speeded up */ |
| 164 | SYSCTL_INT(_debug, OID_AUTO, rush_requests, CTLFLAG_RW, |
| 165 | &stat_rush_requests, 0, ""); |
| 166 | |
| 167 | static int syncer_delayno = 0; |
| 168 | static long syncer_mask; |
| 169 | LIST_HEAD(synclist, vnode); |
| 170 | static struct synclist *syncer_workitem_pending; |
| 171 | |
| 172 | int desiredvnodes; |
| 173 | SYSCTL_INT(_kern, KERN_MAXVNODES, maxvnodes, CTLFLAG_RW, |
| 174 | &desiredvnodes, 0, "Maximum number of vnodes"); |
| 175 | static int minvnodes; |
| 176 | SYSCTL_INT(_kern, OID_AUTO, minvnodes, CTLFLAG_RW, |
| 177 | &minvnodes, 0, "Minimum number of vnodes"); |
| 178 | static int vnlru_nowhere = 0; |
| 179 | SYSCTL_INT(_debug, OID_AUTO, vnlru_nowhere, CTLFLAG_RW, |
| 180 | &vnlru_nowhere, 0, |
| 181 | "Number of times the vnlru process ran without success"); |
| 182 | |
| 183 | static void vfs_free_addrlist (struct netexport *nep); |
| 184 | static int vfs_free_netcred (struct radix_node *rn, void *w); |
| 185 | static int vfs_hang_addrlist (struct mount *mp, struct netexport *nep, |
| 186 | struct export_args *argp); |
| 187 | |
| 188 | #define VSHOULDFREE(vp) \ |
| 189 | (!((vp)->v_flag & (VFREE|VDOOMED)) && \ |
| 190 | !(vp)->v_holdcnt && !(vp)->v_usecount && \ |
| 191 | (!(vp)->v_object || \ |
| 192 | !((vp)->v_object->ref_count || (vp)->v_object->resident_page_count))) |
| 193 | |
| 194 | #define VMIGHTFREE(vp) \ |
| 195 | (((vp)->v_flag & (VFREE|VDOOMED|VXLOCK)) == 0 && \ |
| 196 | cache_leaf_test(vp) == 0 && (vp)->v_usecount == 0) |
| 197 | |
| 198 | #define VSHOULDBUSY(vp) \ |
| 199 | (((vp)->v_flag & VFREE) && \ |
| 200 | ((vp)->v_holdcnt || (vp)->v_usecount)) |
| 201 | |
| 202 | static void vbusy(struct vnode *vp); |
| 203 | static void vfree(struct vnode *vp); |
| 204 | static void vmaybefree(struct vnode *vp); |
| 205 | |
| 206 | extern int dev_ref_debug; |
| 207 | |
| 208 | /* |
| 209 | * NOTE: the vnode interlock must be held on call. |
| 210 | */ |
| 211 | static __inline void |
| 212 | vmaybefree(struct vnode *vp) |
| 213 | { |
| 214 | if (VSHOULDFREE(vp)) |
| 215 | vfree(vp); |
| 216 | } |
| 217 | |
| 218 | /* |
| 219 | * Initialize the vnode management data structures. |
| 220 | */ |
| 221 | void |
| 222 | vntblinit(void) |
| 223 | { |
| 224 | |
| 225 | /* |
| 226 | * Desired vnodes is a result of the physical page count |
| 227 | * and the size of kernel's heap. It scales in proportion |
| 228 | * to the amount of available physical memory. This can |
| 229 | * cause trouble on 64-bit and large memory platforms. |
| 230 | */ |
| 231 | /* desiredvnodes = maxproc + vmstats.v_page_count / 4; */ |
| 232 | desiredvnodes = |
| 233 | min(maxproc + vmstats.v_page_count /4, |
| 234 | 2 * (VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS) / |
| 235 | (5 * (sizeof(struct vm_object) + sizeof(struct vnode)))); |
| 236 | |
| 237 | minvnodes = desiredvnodes / 4; |
| 238 | lwkt_token_init(&mountlist_token); |
| 239 | lwkt_token_init(&mntvnode_token); |
| 240 | lwkt_token_init(&mntid_token); |
| 241 | lwkt_token_init(&spechash_token); |
| 242 | TAILQ_INIT(&vnode_free_list); |
| 243 | lwkt_token_init(&vnode_free_list_token); |
| 244 | vnode_zone = zinit("VNODE", sizeof (struct vnode), 0, 0, 5); |
| 245 | /* |
| 246 | * Initialize the filesystem syncer. |
| 247 | */ |
| 248 | syncer_workitem_pending = hashinit(syncer_maxdelay, M_VNODE, |
| 249 | &syncer_mask); |
| 250 | syncer_maxdelay = syncer_mask + 1; |
| 251 | } |
| 252 | |
| 253 | /* |
| 254 | * Mark a mount point as busy. Used to synchronize access and to delay |
| 255 | * unmounting. Interlock is not released on failure. |
| 256 | */ |
| 257 | int |
| 258 | vfs_busy(struct mount *mp, int flags, |
| 259 | lwkt_tokref_t interlkp, struct thread *td) |
| 260 | { |
| 261 | int lkflags; |
| 262 | |
| 263 | if (mp->mnt_kern_flag & MNTK_UNMOUNT) { |
| 264 | if (flags & LK_NOWAIT) |
| 265 | return (ENOENT); |
| 266 | mp->mnt_kern_flag |= MNTK_MWAIT; |
| 267 | /* |
| 268 | * Since all busy locks are shared except the exclusive |
| 269 | * lock granted when unmounting, the only place that a |
| 270 | * wakeup needs to be done is at the release of the |
| 271 | * exclusive lock at the end of dounmount. |
| 272 | * |
| 273 | * note: interlkp is a serializer and thus can be safely |
| 274 | * held through any sleep |
| 275 | */ |
| 276 | tsleep((caddr_t)mp, 0, "vfs_busy", 0); |
| 277 | return (ENOENT); |
| 278 | } |
| 279 | lkflags = LK_SHARED | LK_NOPAUSE; |
| 280 | if (interlkp) |
| 281 | lkflags |= LK_INTERLOCK; |
| 282 | if (lockmgr(&mp->mnt_lock, lkflags, interlkp, td)) |
| 283 | panic("vfs_busy: unexpected lock failure"); |
| 284 | return (0); |
| 285 | } |
| 286 | |
| 287 | /* |
| 288 | * Free a busy filesystem. |
| 289 | */ |
| 290 | void |
| 291 | vfs_unbusy(struct mount *mp, struct thread *td) |
| 292 | { |
| 293 | lockmgr(&mp->mnt_lock, LK_RELEASE, NULL, td); |
| 294 | } |
| 295 | |
| 296 | /* |
| 297 | * Lookup a filesystem type, and if found allocate and initialize |
| 298 | * a mount structure for it. |
| 299 | * |
| 300 | * Devname is usually updated by mount(8) after booting. |
| 301 | */ |
| 302 | int |
| 303 | vfs_rootmountalloc(char *fstypename, char *devname, struct mount **mpp) |
| 304 | { |
| 305 | struct thread *td = curthread; /* XXX */ |
| 306 | struct vfsconf *vfsp; |
| 307 | struct mount *mp; |
| 308 | |
| 309 | if (fstypename == NULL) |
| 310 | return (ENODEV); |
| 311 | for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) |
| 312 | if (!strcmp(vfsp->vfc_name, fstypename)) |
| 313 | break; |
| 314 | if (vfsp == NULL) |
| 315 | return (ENODEV); |
| 316 | mp = malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK); |
| 317 | bzero((char *)mp, (u_long)sizeof(struct mount)); |
| 318 | lockinit(&mp->mnt_lock, 0, "vfslock", VLKTIMEOUT, LK_NOPAUSE); |
| 319 | vfs_busy(mp, LK_NOWAIT, NULL, td); |
| 320 | TAILQ_INIT(&mp->mnt_nvnodelist); |
| 321 | TAILQ_INIT(&mp->mnt_reservedvnlist); |
| 322 | mp->mnt_nvnodelistsize = 0; |
| 323 | mp->mnt_vfc = vfsp; |
| 324 | mp->mnt_op = vfsp->vfc_vfsops; |
| 325 | mp->mnt_flag = MNT_RDONLY; |
| 326 | mp->mnt_vnodecovered = NULLVP; |
| 327 | vfsp->vfc_refcount++; |
| 328 | mp->mnt_iosize_max = DFLTPHYS; |
| 329 | mp->mnt_stat.f_type = vfsp->vfc_typenum; |
| 330 | mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK; |
| 331 | strncpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); |
| 332 | mp->mnt_stat.f_mntonname[0] = '/'; |
| 333 | mp->mnt_stat.f_mntonname[1] = 0; |
| 334 | (void) copystr(devname, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 0); |
| 335 | *mpp = mp; |
| 336 | return (0); |
| 337 | } |
| 338 | |
| 339 | /* |
| 340 | * Lookup a mount point by filesystem identifier. |
| 341 | */ |
| 342 | struct mount * |
| 343 | vfs_getvfs(fsid_t *fsid) |
| 344 | { |
| 345 | struct mount *mp; |
| 346 | lwkt_tokref ilock; |
| 347 | |
| 348 | lwkt_gettoken(&ilock, &mountlist_token); |
| 349 | TAILQ_FOREACH(mp, &mountlist, mnt_list) { |
| 350 | if (mp->mnt_stat.f_fsid.val[0] == fsid->val[0] && |
| 351 | mp->mnt_stat.f_fsid.val[1] == fsid->val[1]) { |
| 352 | break; |
| 353 | } |
| 354 | } |
| 355 | lwkt_reltoken(&ilock); |
| 356 | return (mp); |
| 357 | } |
| 358 | |
| 359 | /* |
| 360 | * Get a new unique fsid. Try to make its val[0] unique, since this value |
| 361 | * will be used to create fake device numbers for stat(). Also try (but |
| 362 | * not so hard) make its val[0] unique mod 2^16, since some emulators only |
| 363 | * support 16-bit device numbers. We end up with unique val[0]'s for the |
| 364 | * first 2^16 calls and unique val[0]'s mod 2^16 for the first 2^8 calls. |
| 365 | * |
| 366 | * Keep in mind that several mounts may be running in parallel. Starting |
| 367 | * the search one past where the previous search terminated is both a |
| 368 | * micro-optimization and a defense against returning the same fsid to |
| 369 | * different mounts. |
| 370 | */ |
| 371 | void |
| 372 | vfs_getnewfsid(struct mount *mp) |
| 373 | { |
| 374 | static u_int16_t mntid_base; |
| 375 | lwkt_tokref ilock; |
| 376 | fsid_t tfsid; |
| 377 | int mtype; |
| 378 | |
| 379 | lwkt_gettoken(&ilock, &mntid_token); |
| 380 | mtype = mp->mnt_vfc->vfc_typenum; |
| 381 | tfsid.val[1] = mtype; |
| 382 | mtype = (mtype & 0xFF) << 24; |
| 383 | for (;;) { |
| 384 | tfsid.val[0] = makeudev(255, |
| 385 | mtype | ((mntid_base & 0xFF00) << 8) | (mntid_base & 0xFF)); |
| 386 | mntid_base++; |
| 387 | if (vfs_getvfs(&tfsid) == NULL) |
| 388 | break; |
| 389 | } |
| 390 | mp->mnt_stat.f_fsid.val[0] = tfsid.val[0]; |
| 391 | mp->mnt_stat.f_fsid.val[1] = tfsid.val[1]; |
| 392 | lwkt_reltoken(&ilock); |
| 393 | } |
| 394 | |
| 395 | /* |
| 396 | * Knob to control the precision of file timestamps: |
| 397 | * |
| 398 | * 0 = seconds only; nanoseconds zeroed. |
| 399 | * 1 = seconds and nanoseconds, accurate within 1/HZ. |
| 400 | * 2 = seconds and nanoseconds, truncated to microseconds. |
| 401 | * >=3 = seconds and nanoseconds, maximum precision. |
| 402 | */ |
| 403 | enum { TSP_SEC, TSP_HZ, TSP_USEC, TSP_NSEC }; |
| 404 | |
| 405 | static int timestamp_precision = TSP_SEC; |
| 406 | SYSCTL_INT(_vfs, OID_AUTO, timestamp_precision, CTLFLAG_RW, |
| 407 | ×tamp_precision, 0, ""); |
| 408 | |
| 409 | /* |
| 410 | * Get a current timestamp. |
| 411 | */ |
| 412 | void |
| 413 | vfs_timestamp(struct timespec *tsp) |
| 414 | { |
| 415 | struct timeval tv; |
| 416 | |
| 417 | switch (timestamp_precision) { |
| 418 | case TSP_SEC: |
| 419 | tsp->tv_sec = time_second; |
| 420 | tsp->tv_nsec = 0; |
| 421 | break; |
| 422 | case TSP_HZ: |
| 423 | getnanotime(tsp); |
| 424 | break; |
| 425 | case TSP_USEC: |
| 426 | microtime(&tv); |
| 427 | TIMEVAL_TO_TIMESPEC(&tv, tsp); |
| 428 | break; |
| 429 | case TSP_NSEC: |
| 430 | default: |
| 431 | nanotime(tsp); |
| 432 | break; |
| 433 | } |
| 434 | } |
| 435 | |
| 436 | /* |
| 437 | * Set vnode attributes to VNOVAL |
| 438 | */ |
| 439 | void |
| 440 | vattr_null(struct vattr *vap) |
| 441 | { |
| 442 | vap->va_type = VNON; |
| 443 | vap->va_size = VNOVAL; |
| 444 | vap->va_bytes = VNOVAL; |
| 445 | vap->va_mode = VNOVAL; |
| 446 | vap->va_nlink = VNOVAL; |
| 447 | vap->va_uid = VNOVAL; |
| 448 | vap->va_gid = VNOVAL; |
| 449 | vap->va_fsid = VNOVAL; |
| 450 | vap->va_fileid = VNOVAL; |
| 451 | vap->va_blocksize = VNOVAL; |
| 452 | vap->va_rdev = VNOVAL; |
| 453 | vap->va_atime.tv_sec = VNOVAL; |
| 454 | vap->va_atime.tv_nsec = VNOVAL; |
| 455 | vap->va_mtime.tv_sec = VNOVAL; |
| 456 | vap->va_mtime.tv_nsec = VNOVAL; |
| 457 | vap->va_ctime.tv_sec = VNOVAL; |
| 458 | vap->va_ctime.tv_nsec = VNOVAL; |
| 459 | vap->va_flags = VNOVAL; |
| 460 | vap->va_gen = VNOVAL; |
| 461 | vap->va_vaflags = 0; |
| 462 | } |
| 463 | |
| 464 | /* |
| 465 | * This routine is called when we have too many vnodes. It attempts |
| 466 | * to free <count> vnodes and will potentially free vnodes that still |
| 467 | * have VM backing store (VM backing store is typically the cause |
| 468 | * of a vnode blowout so we want to do this). Therefore, this operation |
| 469 | * is not considered cheap. |
| 470 | * |
| 471 | * A number of conditions may prevent a vnode from being reclaimed. |
| 472 | * the buffer cache may have references on the vnode, a directory |
| 473 | * vnode may still have references due to the namei cache representing |
| 474 | * underlying files, or the vnode may be in active use. It is not |
| 475 | * desireable to reuse such vnodes. These conditions may cause the |
| 476 | * number of vnodes to reach some minimum value regardless of what |
| 477 | * you set kern.maxvnodes to. Do not set kern.maxvnodes too low. |
| 478 | */ |
| 479 | static int |
| 480 | vlrureclaim(struct mount *mp) |
| 481 | { |
| 482 | struct vnode *vp; |
| 483 | lwkt_tokref ilock; |
| 484 | lwkt_tokref vlock; |
| 485 | int done; |
| 486 | int trigger; |
| 487 | int usevnodes; |
| 488 | int count; |
| 489 | |
| 490 | /* |
| 491 | * Calculate the trigger point, don't allow user |
| 492 | * screwups to blow us up. This prevents us from |
| 493 | * recycling vnodes with lots of resident pages. We |
| 494 | * aren't trying to free memory, we are trying to |
| 495 | * free vnodes. |
| 496 | */ |
| 497 | usevnodes = desiredvnodes; |
| 498 | if (usevnodes <= 0) |
| 499 | usevnodes = 1; |
| 500 | trigger = vmstats.v_page_count * 2 / usevnodes; |
| 501 | |
| 502 | done = 0; |
| 503 | lwkt_gettoken(&ilock, &mntvnode_token); |
| 504 | count = mp->mnt_nvnodelistsize / 10 + 1; |
| 505 | while (count && (vp = TAILQ_FIRST(&mp->mnt_nvnodelist)) != NULL) { |
| 506 | /* |
| 507 | * __VNODESCAN__ |
| 508 | * |
| 509 | * The VP will stick around while we hold mntvnode_token, |
| 510 | * at least until we block, so we can safely do an initial |
| 511 | * check. But we have to check again after obtaining |
| 512 | * the vnode interlock. vp->v_interlock points to stable |
| 513 | * storage so it's ok if the vp gets ripped out from |
| 514 | * under us while we are blocked. |
| 515 | */ |
| 516 | if (vp->v_type == VNON || |
| 517 | vp->v_type == VBAD || |
| 518 | !VMIGHTFREE(vp) || /* critical path opt */ |
| 519 | (vp->v_object && |
| 520 | vp->v_object->resident_page_count >= trigger) |
| 521 | ) { |
| 522 | TAILQ_REMOVE(&mp->mnt_nvnodelist, vp, v_nmntvnodes); |
| 523 | TAILQ_INSERT_TAIL(&mp->mnt_nvnodelist,vp, v_nmntvnodes); |
| 524 | --count; |
| 525 | continue; |
| 526 | } |
| 527 | |
| 528 | /* |
| 529 | * Get the interlock, delay moving the node to the tail so |
| 530 | * we don't race against new additions to the mountlist. |
| 531 | */ |
| 532 | lwkt_gettoken(&vlock, vp->v_interlock); |
| 533 | if (TAILQ_FIRST(&mp->mnt_nvnodelist) != vp) { |
| 534 | lwkt_reltoken(&vlock); |
| 535 | continue; |
| 536 | } |
| 537 | TAILQ_REMOVE(&mp->mnt_nvnodelist, vp, v_nmntvnodes); |
| 538 | TAILQ_INSERT_TAIL(&mp->mnt_nvnodelist,vp, v_nmntvnodes); |
| 539 | |
| 540 | /* |
| 541 | * Must check again |
| 542 | */ |
| 543 | if (vp->v_type == VNON || |
| 544 | vp->v_type == VBAD || |
| 545 | !VMIGHTFREE(vp) || /* critical path opt */ |
| 546 | (vp->v_object && |
| 547 | vp->v_object->resident_page_count >= trigger) |
| 548 | ) { |
| 549 | lwkt_reltoken(&vlock); |
| 550 | --count; |
| 551 | continue; |
| 552 | } |
| 553 | vgonel(vp, &vlock, curthread); |
| 554 | ++done; |
| 555 | --count; |
| 556 | } |
| 557 | lwkt_reltoken(&ilock); |
| 558 | return done; |
| 559 | } |
| 560 | |
| 561 | /* |
| 562 | * Attempt to recycle vnodes in a context that is always safe to block. |
| 563 | * Calling vlrurecycle() from the bowels of file system code has some |
| 564 | * interesting deadlock problems. |
| 565 | */ |
| 566 | static struct thread *vnlruthread; |
| 567 | static int vnlruproc_sig; |
| 568 | |
| 569 | static void |
| 570 | vnlru_proc(void) |
| 571 | { |
| 572 | struct mount *mp, *nmp; |
| 573 | lwkt_tokref ilock; |
| 574 | int s; |
| 575 | int done; |
| 576 | struct thread *td = curthread; |
| 577 | |
| 578 | EVENTHANDLER_REGISTER(shutdown_pre_sync, shutdown_kproc, td, |
| 579 | SHUTDOWN_PRI_FIRST); |
| 580 | |
| 581 | s = splbio(); |
| 582 | for (;;) { |
| 583 | kproc_suspend_loop(); |
| 584 | if (numvnodes - freevnodes <= desiredvnodes * 9 / 10) { |
| 585 | vnlruproc_sig = 0; |
| 586 | wakeup(&vnlruproc_sig); |
| 587 | tsleep(td, 0, "vlruwt", hz); |
| 588 | continue; |
| 589 | } |
| 590 | done = 0; |
| 591 | lwkt_gettoken(&ilock, &mountlist_token); |
| 592 | for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { |
| 593 | if (vfs_busy(mp, LK_NOWAIT, &ilock, td)) { |
| 594 | nmp = TAILQ_NEXT(mp, mnt_list); |
| 595 | continue; |
| 596 | } |
| 597 | done += vlrureclaim(mp); |
| 598 | lwkt_gettokref(&ilock); |
| 599 | nmp = TAILQ_NEXT(mp, mnt_list); |
| 600 | vfs_unbusy(mp, td); |
| 601 | } |
| 602 | lwkt_reltoken(&ilock); |
| 603 | if (done == 0) { |
| 604 | vnlru_nowhere++; |
| 605 | tsleep(td, 0, "vlrup", hz * 3); |
| 606 | } |
| 607 | } |
| 608 | splx(s); |
| 609 | } |
| 610 | |
| 611 | static struct kproc_desc vnlru_kp = { |
| 612 | "vnlru", |
| 613 | vnlru_proc, |
| 614 | &vnlruthread |
| 615 | }; |
| 616 | SYSINIT(vnlru, SI_SUB_KTHREAD_UPDATE, SI_ORDER_FIRST, kproc_start, &vnlru_kp) |
| 617 | |
| 618 | /* |
| 619 | * Routines having to do with the management of the vnode table. |
| 620 | */ |
| 621 | extern vop_t **dead_vnodeop_p; |
| 622 | |
| 623 | /* |
| 624 | * Return the next vnode from the free list. |
| 625 | */ |
| 626 | int |
| 627 | getnewvnode(enum vtagtype tag, struct mount *mp, |
| 628 | vop_t **vops, struct vnode **vpp) |
| 629 | { |
| 630 | int s; |
| 631 | struct thread *td = curthread; /* XXX */ |
| 632 | struct vnode *vp = NULL; |
| 633 | struct vnode *xvp; |
| 634 | vm_object_t object; |
| 635 | lwkt_tokref ilock; |
| 636 | lwkt_tokref vlock; |
| 637 | |
| 638 | s = splbio(); |
| 639 | |
| 640 | /* |
| 641 | * Try to reuse vnodes if we hit the max. This situation only |
| 642 | * occurs in certain large-memory (2G+) situations. We cannot |
| 643 | * attempt to directly reclaim vnodes due to nasty recursion |
| 644 | * problems. |
| 645 | */ |
| 646 | while (numvnodes - freevnodes > desiredvnodes) { |
| 647 | if (vnlruproc_sig == 0) { |
| 648 | vnlruproc_sig = 1; /* avoid unnecessary wakeups */ |
| 649 | wakeup(vnlruthread); |
| 650 | } |
| 651 | tsleep(&vnlruproc_sig, 0, "vlruwk", hz); |
| 652 | } |
| 653 | |
| 654 | |
| 655 | /* |
| 656 | * Attempt to reuse a vnode already on the free list, allocating |
| 657 | * a new vnode if we can't find one or if we have not reached a |
| 658 | * good minimum for good LRU performance. |
| 659 | */ |
| 660 | lwkt_gettoken(&ilock, &vnode_free_list_token); |
| 661 | if (freevnodes >= wantfreevnodes && numvnodes >= minvnodes) { |
| 662 | int count; |
| 663 | |
| 664 | for (count = 0; count < freevnodes; count++) { |
| 665 | /* |
| 666 | * __VNODESCAN__ |
| 667 | * |
| 668 | * Pull the next vnode off the free list and do some |
| 669 | * sanity checks. Note that regardless of how we |
| 670 | * block, if freevnodes is non-zero there had better |
| 671 | * be something on the list. |
| 672 | */ |
| 673 | vp = TAILQ_FIRST(&vnode_free_list); |
| 674 | if (vp == NULL) |
| 675 | panic("getnewvnode: free vnode isn't"); |
| 676 | |
| 677 | /* |
| 678 | * Move the vnode to the end of the list so other |
| 679 | * processes do not double-block trying to recycle |
| 680 | * the same vnode (as an optimization), then get |
| 681 | * the interlock. |
| 682 | */ |
| 683 | TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); |
| 684 | TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist); |
| 685 | |
| 686 | /* |
| 687 | * Skip vnodes that are in the process of being |
| 688 | * held or referenced. Since the act of adding or |
| 689 | * removing a vnode on the freelist requires a token |
| 690 | * and may block, the ref count may be adjusted |
| 691 | * prior to its addition or removal. |
| 692 | */ |
| 693 | if (VSHOULDBUSY(vp)) { |
| 694 | vp = NULL; |
| 695 | continue; |
| 696 | } |
| 697 | |
| 698 | |
| 699 | /* |
| 700 | * Obtain the vnode interlock and check that the |
| 701 | * vnode is still on the free list. |
| 702 | * |
| 703 | * This normally devolves into a degenerate case so |
| 704 | * it is optimal. Loop up if it isn't. Note that |
| 705 | * the vnode could be in the middle of being moved |
| 706 | * off the free list (the VSHOULDBUSY() check) and |
| 707 | * must be skipped if so. |
| 708 | */ |
| 709 | lwkt_gettoken(&vlock, vp->v_interlock); |
| 710 | TAILQ_FOREACH_REVERSE(xvp, &vnode_free_list, |
| 711 | freelst, v_freelist) { |
| 712 | if (vp == xvp) |
| 713 | break; |
| 714 | } |
| 715 | if (vp != xvp || VSHOULDBUSY(vp)) { |
| 716 | vp = NULL; |
| 717 | continue; |
| 718 | } |
| 719 | |
| 720 | /* |
| 721 | * We now safely own the vnode. If the vnode has |
| 722 | * an object do not recycle it if its VM object |
| 723 | * has resident pages or references. |
| 724 | */ |
| 725 | if ((VOP_GETVOBJECT(vp, &object) == 0 && |
| 726 | (object->resident_page_count || object->ref_count)) |
| 727 | ) { |
| 728 | lwkt_reltoken(&vlock); |
| 729 | vp = NULL; |
| 730 | continue; |
| 731 | } |
| 732 | |
| 733 | /* |
| 734 | * We can almost reuse this vnode. But we don't want |
| 735 | * to recycle it if the vnode has children in the |
| 736 | * namecache because that breaks the namecache's |
| 737 | * path element chain. (YYY use nc_refs for the |
| 738 | * check?) |
| 739 | */ |
| 740 | KKASSERT(vp->v_flag & VFREE); |
| 741 | TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); |
| 742 | |
| 743 | if (TAILQ_FIRST(&vp->v_namecache) == NULL || |
| 744 | cache_leaf_test(vp) >= 0) { |
| 745 | /* ok, we can reuse this vnode */ |
| 746 | break; |
| 747 | } |
| 748 | lwkt_reltoken(&vlock); |
| 749 | TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist); |
| 750 | vp = NULL; |
| 751 | } |
| 752 | } |
| 753 | |
| 754 | /* |
| 755 | * If vp is non-NULL we hold it's interlock. |
| 756 | */ |
| 757 | if (vp) { |
| 758 | vp->v_flag |= VDOOMED; |
| 759 | vp->v_flag &= ~VFREE; |
| 760 | freevnodes--; |
| 761 | lwkt_reltoken(&ilock); |
| 762 | cache_purge(vp); /* YYY may block */ |
| 763 | vp->v_lease = NULL; |
| 764 | if (vp->v_type != VBAD) { |
| 765 | vgonel(vp, &vlock, td); |
| 766 | } else { |
| 767 | lwkt_reltoken(&vlock); |
| 768 | } |
| 769 | |
| 770 | #ifdef INVARIANTS |
| 771 | { |
| 772 | int s; |
| 773 | |
| 774 | if (vp->v_data) |
| 775 | panic("cleaned vnode isn't"); |
| 776 | s = splbio(); |
| 777 | if (vp->v_numoutput) |
| 778 | panic("Clean vnode has pending I/O's"); |
| 779 | splx(s); |
| 780 | } |
| 781 | #endif |
| 782 | vp->v_flag = 0; |
| 783 | vp->v_lastw = 0; |
| 784 | vp->v_lasta = 0; |
| 785 | vp->v_cstart = 0; |
| 786 | vp->v_clen = 0; |
| 787 | vp->v_socket = 0; |
| 788 | vp->v_writecount = 0; /* XXX */ |
| 789 | } else { |
| 790 | lwkt_reltoken(&ilock); |
| 791 | vp = zalloc(vnode_zone); |
| 792 | bzero(vp, sizeof(*vp)); |
| 793 | vp->v_interlock = lwkt_token_pool_get(vp); |
| 794 | lwkt_token_init(&vp->v_pollinfo.vpi_token); |
| 795 | cache_purge(vp); |
| 796 | TAILQ_INIT(&vp->v_namecache); |
| 797 | numvnodes++; |
| 798 | } |
| 799 | |
| 800 | TAILQ_INIT(&vp->v_cleanblkhd); |
| 801 | TAILQ_INIT(&vp->v_dirtyblkhd); |
| 802 | vp->v_type = VNON; |
| 803 | vp->v_tag = tag; |
| 804 | vp->v_op = vops; |
| 805 | insmntque(vp, mp); |
| 806 | *vpp = vp; |
| 807 | vp->v_usecount = 1; |
| 808 | vp->v_data = 0; |
| 809 | splx(s); |
| 810 | |
| 811 | vfs_object_create(vp, td); |
| 812 | return (0); |
| 813 | } |
| 814 | |
| 815 | /* |
| 816 | * Move a vnode from one mount queue to another. |
| 817 | */ |
| 818 | static void |
| 819 | insmntque(struct vnode *vp, struct mount *mp) |
| 820 | { |
| 821 | lwkt_tokref ilock; |
| 822 | |
| 823 | lwkt_gettoken(&ilock, &mntvnode_token); |
| 824 | /* |
| 825 | * Delete from old mount point vnode list, if on one. |
| 826 | */ |
| 827 | if (vp->v_mount != NULL) { |
| 828 | KASSERT(vp->v_mount->mnt_nvnodelistsize > 0, |
| 829 | ("bad mount point vnode list size")); |
| 830 | TAILQ_REMOVE(&vp->v_mount->mnt_nvnodelist, vp, v_nmntvnodes); |
| 831 | vp->v_mount->mnt_nvnodelistsize--; |
| 832 | } |
| 833 | /* |
| 834 | * Insert into list of vnodes for the new mount point, if available. |
| 835 | */ |
| 836 | if ((vp->v_mount = mp) == NULL) { |
| 837 | lwkt_reltoken(&ilock); |
| 838 | return; |
| 839 | } |
| 840 | TAILQ_INSERT_TAIL(&mp->mnt_nvnodelist, vp, v_nmntvnodes); |
| 841 | mp->mnt_nvnodelistsize++; |
| 842 | lwkt_reltoken(&ilock); |
| 843 | } |
| 844 | |
| 845 | /* |
| 846 | * Update outstanding I/O count and do wakeup if requested. |
| 847 | */ |
| 848 | void |
| 849 | vwakeup(struct buf *bp) |
| 850 | { |
| 851 | struct vnode *vp; |
| 852 | |
| 853 | bp->b_flags &= ~B_WRITEINPROG; |
| 854 | if ((vp = bp->b_vp)) { |
| 855 | vp->v_numoutput--; |
| 856 | if (vp->v_numoutput < 0) |
| 857 | panic("vwakeup: neg numoutput"); |
| 858 | if ((vp->v_numoutput == 0) && (vp->v_flag & VBWAIT)) { |
| 859 | vp->v_flag &= ~VBWAIT; |
| 860 | wakeup((caddr_t) &vp->v_numoutput); |
| 861 | } |
| 862 | } |
| 863 | } |
| 864 | |
| 865 | /* |
| 866 | * Flush out and invalidate all buffers associated with a vnode. |
| 867 | * Called with the underlying object locked. |
| 868 | */ |
| 869 | int |
| 870 | vinvalbuf(struct vnode *vp, int flags, struct thread *td, |
| 871 | int slpflag, int slptimeo) |
| 872 | { |
| 873 | struct buf *bp; |
| 874 | struct buf *nbp, *blist; |
| 875 | int s, error; |
| 876 | vm_object_t object; |
| 877 | lwkt_tokref vlock; |
| 878 | |
| 879 | if (flags & V_SAVE) { |
| 880 | s = splbio(); |
| 881 | while (vp->v_numoutput) { |
| 882 | vp->v_flag |= VBWAIT; |
| 883 | error = tsleep((caddr_t)&vp->v_numoutput, |
| 884 | slpflag, "vinvlbuf", slptimeo); |
| 885 | if (error) { |
| 886 | splx(s); |
| 887 | return (error); |
| 888 | } |
| 889 | } |
| 890 | if (!TAILQ_EMPTY(&vp->v_dirtyblkhd)) { |
| 891 | splx(s); |
| 892 | if ((error = VOP_FSYNC(vp, MNT_WAIT, td)) != 0) |
| 893 | return (error); |
| 894 | s = splbio(); |
| 895 | if (vp->v_numoutput > 0 || |
| 896 | !TAILQ_EMPTY(&vp->v_dirtyblkhd)) |
| 897 | panic("vinvalbuf: dirty bufs"); |
| 898 | } |
| 899 | splx(s); |
| 900 | } |
| 901 | s = splbio(); |
| 902 | for (;;) { |
| 903 | blist = TAILQ_FIRST(&vp->v_cleanblkhd); |
| 904 | if (!blist) |
| 905 | blist = TAILQ_FIRST(&vp->v_dirtyblkhd); |
| 906 | if (!blist) |
| 907 | break; |
| 908 | |
| 909 | for (bp = blist; bp; bp = nbp) { |
| 910 | nbp = TAILQ_NEXT(bp, b_vnbufs); |
| 911 | if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) { |
| 912 | error = BUF_TIMELOCK(bp, |
| 913 | LK_EXCLUSIVE | LK_SLEEPFAIL, |
| 914 | "vinvalbuf", slpflag, slptimeo); |
| 915 | if (error == ENOLCK) |
| 916 | break; |
| 917 | splx(s); |
| 918 | return (error); |
| 919 | } |
| 920 | /* |
| 921 | * XXX Since there are no node locks for NFS, I |
| 922 | * believe there is a slight chance that a delayed |
| 923 | * write will occur while sleeping just above, so |
| 924 | * check for it. Note that vfs_bio_awrite expects |
| 925 | * buffers to reside on a queue, while VOP_BWRITE and |
| 926 | * brelse do not. |
| 927 | */ |
| 928 | if (((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI) && |
| 929 | (flags & V_SAVE)) { |
| 930 | |
| 931 | if (bp->b_vp == vp) { |
| 932 | if (bp->b_flags & B_CLUSTEROK) { |
| 933 | BUF_UNLOCK(bp); |
| 934 | vfs_bio_awrite(bp); |
| 935 | } else { |
| 936 | bremfree(bp); |
| 937 | bp->b_flags |= B_ASYNC; |
| 938 | VOP_BWRITE(bp->b_vp, bp); |
| 939 | } |
| 940 | } else { |
| 941 | bremfree(bp); |
| 942 | (void) VOP_BWRITE(bp->b_vp, bp); |
| 943 | } |
| 944 | break; |
| 945 | } |
| 946 | bremfree(bp); |
| 947 | bp->b_flags |= (B_INVAL | B_NOCACHE | B_RELBUF); |
| 948 | bp->b_flags &= ~B_ASYNC; |
| 949 | brelse(bp); |
| 950 | } |
| 951 | } |
| 952 | |
| 953 | /* |
| 954 | * Wait for I/O to complete. XXX needs cleaning up. The vnode can |
| 955 | * have write I/O in-progress but if there is a VM object then the |
| 956 | * VM object can also have read-I/O in-progress. |
| 957 | */ |
| 958 | do { |
| 959 | while (vp->v_numoutput > 0) { |
| 960 | vp->v_flag |= VBWAIT; |
| 961 | tsleep(&vp->v_numoutput, 0, "vnvlbv", 0); |
| 962 | } |
| 963 | if (VOP_GETVOBJECT(vp, &object) == 0) { |
| 964 | while (object->paging_in_progress) |
| 965 | vm_object_pip_sleep(object, "vnvlbx"); |
| 966 | } |
| 967 | } while (vp->v_numoutput > 0); |
| 968 | |
| 969 | splx(s); |
| 970 | |
| 971 | /* |
| 972 | * Destroy the copy in the VM cache, too. |
| 973 | */ |
| 974 | lwkt_gettoken(&vlock, vp->v_interlock); |
| 975 | if (VOP_GETVOBJECT(vp, &object) == 0) { |
| 976 | vm_object_page_remove(object, 0, 0, |
| 977 | (flags & V_SAVE) ? TRUE : FALSE); |
| 978 | } |
| 979 | lwkt_reltoken(&vlock); |
| 980 | |
| 981 | if (!TAILQ_EMPTY(&vp->v_dirtyblkhd) || !TAILQ_EMPTY(&vp->v_cleanblkhd)) |
| 982 | panic("vinvalbuf: flush failed"); |
| 983 | return (0); |
| 984 | } |
| 985 | |
| 986 | /* |
| 987 | * Truncate a file's buffer and pages to a specified length. This |
| 988 | * is in lieu of the old vinvalbuf mechanism, which performed unneeded |
| 989 | * sync activity. |
| 990 | */ |
| 991 | int |
| 992 | vtruncbuf(struct vnode *vp, struct thread *td, off_t length, int blksize) |
| 993 | { |
| 994 | struct buf *bp; |
| 995 | struct buf *nbp; |
| 996 | int s, anyfreed; |
| 997 | int trunclbn; |
| 998 | |
| 999 | /* |
| 1000 | * Round up to the *next* lbn. |
| 1001 | */ |
| 1002 | trunclbn = (length + blksize - 1) / blksize; |
| 1003 | |
| 1004 | s = splbio(); |
| 1005 | restart: |
| 1006 | anyfreed = 1; |
| 1007 | for (;anyfreed;) { |
| 1008 | anyfreed = 0; |
| 1009 | for (bp = TAILQ_FIRST(&vp->v_cleanblkhd); bp; bp = nbp) { |
| 1010 | nbp = TAILQ_NEXT(bp, b_vnbufs); |
| 1011 | if (bp->b_lblkno >= trunclbn) { |
| 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 | bp->b_flags |= (B_INVAL | B_RELBUF); |
| 1018 | bp->b_flags &= ~B_ASYNC; |
| 1019 | brelse(bp); |
| 1020 | anyfreed = 1; |
| 1021 | } |
| 1022 | if (nbp && |
| 1023 | (((nbp->b_xflags & BX_VNCLEAN) == 0) || |
| 1024 | (nbp->b_vp != vp) || |
| 1025 | (nbp->b_flags & B_DELWRI))) { |
| 1026 | goto restart; |
| 1027 | } |
| 1028 | } |
| 1029 | } |
| 1030 | |
| 1031 | for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { |
| 1032 | nbp = TAILQ_NEXT(bp, b_vnbufs); |
| 1033 | if (bp->b_lblkno >= trunclbn) { |
| 1034 | if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) { |
| 1035 | BUF_LOCK(bp, LK_EXCLUSIVE|LK_SLEEPFAIL); |
| 1036 | goto restart; |
| 1037 | } else { |
| 1038 | bremfree(bp); |
| 1039 | bp->b_flags |= (B_INVAL | B_RELBUF); |
| 1040 | bp->b_flags &= ~B_ASYNC; |
| 1041 | brelse(bp); |
| 1042 | anyfreed = 1; |
| 1043 | } |
| 1044 | if (nbp && |
| 1045 | (((nbp->b_xflags & BX_VNDIRTY) == 0) || |
| 1046 | (nbp->b_vp != vp) || |
| 1047 | (nbp->b_flags & B_DELWRI) == 0)) { |
| 1048 | goto restart; |
| 1049 | } |
| 1050 | } |
| 1051 | } |
| 1052 | } |
| 1053 | |
| 1054 | if (length > 0) { |
| 1055 | restartsync: |
| 1056 | for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { |
| 1057 | nbp = TAILQ_NEXT(bp, b_vnbufs); |
| 1058 | if ((bp->b_flags & B_DELWRI) && (bp->b_lblkno < 0)) { |
| 1059 | if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) { |
| 1060 | BUF_LOCK(bp, LK_EXCLUSIVE|LK_SLEEPFAIL); |
| 1061 | goto restart; |
| 1062 | } else { |
| 1063 | bremfree(bp); |
| 1064 | if (bp->b_vp == vp) { |
| 1065 | bp->b_flags |= B_ASYNC; |
| 1066 | } else { |
| 1067 | bp->b_flags &= ~B_ASYNC; |
| 1068 | } |
| 1069 | VOP_BWRITE(bp->b_vp, bp); |
| 1070 | } |
| 1071 | goto restartsync; |
| 1072 | } |
| 1073 | |
| 1074 | } |
| 1075 | } |
| 1076 | |
| 1077 | while (vp->v_numoutput > 0) { |
| 1078 | vp->v_flag |= VBWAIT; |
| 1079 | tsleep(&vp->v_numoutput, 0, "vbtrunc", 0); |
| 1080 | } |
| 1081 | |
| 1082 | splx(s); |
| 1083 | |
| 1084 | vnode_pager_setsize(vp, length); |
| 1085 | |
| 1086 | return (0); |
| 1087 | } |
| 1088 | |
| 1089 | /* |
| 1090 | * Associate a buffer with a vnode. |
| 1091 | */ |
| 1092 | void |
| 1093 | bgetvp(struct vnode *vp, struct buf *bp) |
| 1094 | { |
| 1095 | int s; |
| 1096 | |
| 1097 | KASSERT(bp->b_vp == NULL, ("bgetvp: not free")); |
| 1098 | |
| 1099 | vhold(vp); |
| 1100 | bp->b_vp = vp; |
| 1101 | bp->b_dev = vn_todev(vp); |
| 1102 | /* |
| 1103 | * Insert onto list for new vnode. |
| 1104 | */ |
| 1105 | s = splbio(); |
| 1106 | bp->b_xflags |= BX_VNCLEAN; |
| 1107 | bp->b_xflags &= ~BX_VNDIRTY; |
| 1108 | TAILQ_INSERT_TAIL(&vp->v_cleanblkhd, bp, b_vnbufs); |
| 1109 | splx(s); |
| 1110 | } |
| 1111 | |
| 1112 | /* |
| 1113 | * Disassociate a buffer from a vnode. |
| 1114 | */ |
| 1115 | void |
| 1116 | brelvp(struct buf *bp) |
| 1117 | { |
| 1118 | struct vnode *vp; |
| 1119 | struct buflists *listheadp; |
| 1120 | int s; |
| 1121 | |
| 1122 | KASSERT(bp->b_vp != NULL, ("brelvp: NULL")); |
| 1123 | |
| 1124 | /* |
| 1125 | * Delete from old vnode list, if on one. |
| 1126 | */ |
| 1127 | vp = bp->b_vp; |
| 1128 | s = splbio(); |
| 1129 | if (bp->b_xflags & (BX_VNDIRTY | BX_VNCLEAN)) { |
| 1130 | if (bp->b_xflags & BX_VNDIRTY) |
| 1131 | listheadp = &vp->v_dirtyblkhd; |
| 1132 | else |
| 1133 | listheadp = &vp->v_cleanblkhd; |
| 1134 | TAILQ_REMOVE(listheadp, bp, b_vnbufs); |
| 1135 | bp->b_xflags &= ~(BX_VNDIRTY | BX_VNCLEAN); |
| 1136 | } |
| 1137 | if ((vp->v_flag & VONWORKLST) && TAILQ_EMPTY(&vp->v_dirtyblkhd)) { |
| 1138 | vp->v_flag &= ~VONWORKLST; |
| 1139 | LIST_REMOVE(vp, v_synclist); |
| 1140 | } |
| 1141 | splx(s); |
| 1142 | bp->b_vp = (struct vnode *) 0; |
| 1143 | vdrop(vp); |
| 1144 | } |
| 1145 | |
| 1146 | /* |
| 1147 | * The workitem queue. |
| 1148 | * |
| 1149 | * It is useful to delay writes of file data and filesystem metadata |
| 1150 | * for tens of seconds so that quickly created and deleted files need |
| 1151 | * not waste disk bandwidth being created and removed. To realize this, |
| 1152 | * we append vnodes to a "workitem" queue. When running with a soft |
| 1153 | * updates implementation, most pending metadata dependencies should |
| 1154 | * not wait for more than a few seconds. Thus, mounted on block devices |
| 1155 | * are delayed only about a half the time that file data is delayed. |
| 1156 | * Similarly, directory updates are more critical, so are only delayed |
| 1157 | * about a third the time that file data is delayed. Thus, there are |
| 1158 | * SYNCER_MAXDELAY queues that are processed round-robin at a rate of |
| 1159 | * one each second (driven off the filesystem syncer process). The |
| 1160 | * syncer_delayno variable indicates the next queue that is to be processed. |
| 1161 | * Items that need to be processed soon are placed in this queue: |
| 1162 | * |
| 1163 | * syncer_workitem_pending[syncer_delayno] |
| 1164 | * |
| 1165 | * A delay of fifteen seconds is done by placing the request fifteen |
| 1166 | * entries later in the queue: |
| 1167 | * |
| 1168 | * syncer_workitem_pending[(syncer_delayno + 15) & syncer_mask] |
| 1169 | * |
| 1170 | */ |
| 1171 | |
| 1172 | /* |
| 1173 | * Add an item to the syncer work queue. |
| 1174 | */ |
| 1175 | static void |
| 1176 | vn_syncer_add_to_worklist(struct vnode *vp, int delay) |
| 1177 | { |
| 1178 | int s, slot; |
| 1179 | |
| 1180 | s = splbio(); |
| 1181 | |
| 1182 | if (vp->v_flag & VONWORKLST) { |
| 1183 | LIST_REMOVE(vp, v_synclist); |
| 1184 | } |
| 1185 | |
| 1186 | if (delay > syncer_maxdelay - 2) |
| 1187 | delay = syncer_maxdelay - 2; |
| 1188 | slot = (syncer_delayno + delay) & syncer_mask; |
| 1189 | |
| 1190 | LIST_INSERT_HEAD(&syncer_workitem_pending[slot], vp, v_synclist); |
| 1191 | vp->v_flag |= VONWORKLST; |
| 1192 | splx(s); |
| 1193 | } |
| 1194 | |
| 1195 | struct thread *updatethread; |
| 1196 | static void sched_sync (void); |
| 1197 | static struct kproc_desc up_kp = { |
| 1198 | "syncer", |
| 1199 | sched_sync, |
| 1200 | &updatethread |
| 1201 | }; |
| 1202 | SYSINIT(syncer, SI_SUB_KTHREAD_UPDATE, SI_ORDER_FIRST, kproc_start, &up_kp) |
| 1203 | |
| 1204 | /* |
| 1205 | * System filesystem synchronizer daemon. |
| 1206 | */ |
| 1207 | void |
| 1208 | sched_sync(void) |
| 1209 | { |
| 1210 | struct synclist *slp; |
| 1211 | struct vnode *vp; |
| 1212 | long starttime; |
| 1213 | int s; |
| 1214 | struct thread *td = curthread; |
| 1215 | |
| 1216 | EVENTHANDLER_REGISTER(shutdown_pre_sync, shutdown_kproc, td, |
| 1217 | SHUTDOWN_PRI_LAST); |
| 1218 | |
| 1219 | for (;;) { |
| 1220 | kproc_suspend_loop(); |
| 1221 | |
| 1222 | starttime = time_second; |
| 1223 | |
| 1224 | /* |
| 1225 | * Push files whose dirty time has expired. Be careful |
| 1226 | * of interrupt race on slp queue. |
| 1227 | */ |
| 1228 | s = splbio(); |
| 1229 | slp = &syncer_workitem_pending[syncer_delayno]; |
| 1230 | syncer_delayno += 1; |
| 1231 | if (syncer_delayno == syncer_maxdelay) |
| 1232 | syncer_delayno = 0; |
| 1233 | splx(s); |
| 1234 | |
| 1235 | while ((vp = LIST_FIRST(slp)) != NULL) { |
| 1236 | if (VOP_ISLOCKED(vp, NULL) == 0) { |
| 1237 | vn_lock(vp, NULL, LK_EXCLUSIVE | LK_RETRY, td); |
| 1238 | (void) VOP_FSYNC(vp, MNT_LAZY, td); |
| 1239 | VOP_UNLOCK(vp, NULL, 0, td); |
| 1240 | } |
| 1241 | s = splbio(); |
| 1242 | if (LIST_FIRST(slp) == vp) { |
| 1243 | /* |
| 1244 | * Note: v_tag VT_VFS vps can remain on the |
| 1245 | * worklist too with no dirty blocks, but |
| 1246 | * since sync_fsync() moves it to a different |
| 1247 | * slot we are safe. |
| 1248 | */ |
| 1249 | if (TAILQ_EMPTY(&vp->v_dirtyblkhd) && |
| 1250 | !vn_isdisk(vp, NULL)) |
| 1251 | panic("sched_sync: fsync failed vp %p tag %d", vp, vp->v_tag); |
| 1252 | /* |
| 1253 | * Put us back on the worklist. The worklist |
| 1254 | * routine will remove us from our current |
| 1255 | * position and then add us back in at a later |
| 1256 | * position. |
| 1257 | */ |
| 1258 | vn_syncer_add_to_worklist(vp, syncdelay); |
| 1259 | } |
| 1260 | splx(s); |
| 1261 | } |
| 1262 | |
| 1263 | /* |
| 1264 | * Do soft update processing. |
| 1265 | */ |
| 1266 | if (bioops.io_sync) |
| 1267 | (*bioops.io_sync)(NULL); |
| 1268 | |
| 1269 | /* |
| 1270 | * The variable rushjob allows the kernel to speed up the |
| 1271 | * processing of the filesystem syncer process. A rushjob |
| 1272 | * value of N tells the filesystem syncer to process the next |
| 1273 | * N seconds worth of work on its queue ASAP. Currently rushjob |
| 1274 | * is used by the soft update code to speed up the filesystem |
| 1275 | * syncer process when the incore state is getting so far |
| 1276 | * ahead of the disk that the kernel memory pool is being |
| 1277 | * threatened with exhaustion. |
| 1278 | */ |
| 1279 | if (rushjob > 0) { |
| 1280 | rushjob -= 1; |
| 1281 | continue; |
| 1282 | } |
| 1283 | /* |
| 1284 | * If it has taken us less than a second to process the |
| 1285 | * current work, then wait. Otherwise start right over |
| 1286 | * again. We can still lose time if any single round |
| 1287 | * takes more than two seconds, but it does not really |
| 1288 | * matter as we are just trying to generally pace the |
| 1289 | * filesystem activity. |
| 1290 | */ |
| 1291 | if (time_second == starttime) |
| 1292 | tsleep(&lbolt, 0, "syncer", 0); |
| 1293 | } |
| 1294 | } |
| 1295 | |
| 1296 | /* |
| 1297 | * Request the syncer daemon to speed up its work. |
| 1298 | * We never push it to speed up more than half of its |
| 1299 | * normal turn time, otherwise it could take over the cpu. |
| 1300 | * |
| 1301 | * YYY wchan field protected by the BGL. |
| 1302 | */ |
| 1303 | int |
| 1304 | speedup_syncer(void) |
| 1305 | { |
| 1306 | crit_enter(); |
| 1307 | if (updatethread->td_wchan == &lbolt) { /* YYY */ |
| 1308 | unsleep(updatethread); |
| 1309 | lwkt_schedule(updatethread); |
| 1310 | } |
| 1311 | crit_exit(); |
| 1312 | if (rushjob < syncdelay / 2) { |
| 1313 | rushjob += 1; |
| 1314 | stat_rush_requests += 1; |
| 1315 | return (1); |
| 1316 | } |
| 1317 | return(0); |
| 1318 | } |
| 1319 | |
| 1320 | /* |
| 1321 | * Associate a p-buffer with a vnode. |
| 1322 | * |
| 1323 | * Also sets B_PAGING flag to indicate that vnode is not fully associated |
| 1324 | * with the buffer. i.e. the bp has not been linked into the vnode or |
| 1325 | * ref-counted. |
| 1326 | */ |
| 1327 | void |
| 1328 | pbgetvp(struct vnode *vp, struct buf *bp) |
| 1329 | { |
| 1330 | KASSERT(bp->b_vp == NULL, ("pbgetvp: not free")); |
| 1331 | |
| 1332 | bp->b_vp = vp; |
| 1333 | bp->b_flags |= B_PAGING; |
| 1334 | bp->b_dev = vn_todev(vp); |
| 1335 | } |
| 1336 | |
| 1337 | /* |
| 1338 | * Disassociate a p-buffer from a vnode. |
| 1339 | */ |
| 1340 | void |
| 1341 | pbrelvp(struct buf *bp) |
| 1342 | { |
| 1343 | KASSERT(bp->b_vp != NULL, ("pbrelvp: NULL")); |
| 1344 | |
| 1345 | /* XXX REMOVE ME */ |
| 1346 | if (TAILQ_NEXT(bp, b_vnbufs) != NULL) { |
| 1347 | panic( |
| 1348 | "relpbuf(): b_vp was probably reassignbuf()d %p %x", |
| 1349 | bp, |
| 1350 | (int)bp->b_flags |
| 1351 | ); |
| 1352 | } |
| 1353 | bp->b_vp = (struct vnode *) 0; |
| 1354 | bp->b_flags &= ~B_PAGING; |
| 1355 | } |
| 1356 | |
| 1357 | void |
| 1358 | pbreassignbuf(struct buf *bp, struct vnode *newvp) |
| 1359 | { |
| 1360 | if ((bp->b_flags & B_PAGING) == 0) { |
| 1361 | panic( |
| 1362 | "pbreassignbuf() on non phys bp %p", |
| 1363 | bp |
| 1364 | ); |
| 1365 | } |
| 1366 | bp->b_vp = newvp; |
| 1367 | } |
| 1368 | |
| 1369 | /* |
| 1370 | * Reassign a buffer from one vnode to another. |
| 1371 | * Used to assign file specific control information |
| 1372 | * (indirect blocks) to the vnode to which they belong. |
| 1373 | */ |
| 1374 | void |
| 1375 | reassignbuf(struct buf *bp, struct vnode *newvp) |
| 1376 | { |
| 1377 | struct buflists *listheadp; |
| 1378 | int delay; |
| 1379 | int s; |
| 1380 | |
| 1381 | if (newvp == NULL) { |
| 1382 | printf("reassignbuf: NULL"); |
| 1383 | return; |
| 1384 | } |
| 1385 | ++reassignbufcalls; |
| 1386 | |
| 1387 | /* |
| 1388 | * B_PAGING flagged buffers cannot be reassigned because their vp |
| 1389 | * is not fully linked in. |
| 1390 | */ |
| 1391 | if (bp->b_flags & B_PAGING) |
| 1392 | panic("cannot reassign paging buffer"); |
| 1393 | |
| 1394 | s = splbio(); |
| 1395 | /* |
| 1396 | * Delete from old vnode list, if on one. |
| 1397 | */ |
| 1398 | if (bp->b_xflags & (BX_VNDIRTY | BX_VNCLEAN)) { |
| 1399 | if (bp->b_xflags & BX_VNDIRTY) |
| 1400 | listheadp = &bp->b_vp->v_dirtyblkhd; |
| 1401 | else |
| 1402 | listheadp = &bp->b_vp->v_cleanblkhd; |
| 1403 | TAILQ_REMOVE(listheadp, bp, b_vnbufs); |
| 1404 | bp->b_xflags &= ~(BX_VNDIRTY | BX_VNCLEAN); |
| 1405 | if (bp->b_vp != newvp) { |
| 1406 | vdrop(bp->b_vp); |
| 1407 | bp->b_vp = NULL; /* for clarification */ |
| 1408 | } |
| 1409 | } |
| 1410 | /* |
| 1411 | * If dirty, put on list of dirty buffers; otherwise insert onto list |
| 1412 | * of clean buffers. |
| 1413 | */ |
| 1414 | if (bp->b_flags & B_DELWRI) { |
| 1415 | struct buf *tbp; |
| 1416 | |
| 1417 | listheadp = &newvp->v_dirtyblkhd; |
| 1418 | if ((newvp->v_flag & VONWORKLST) == 0) { |
| 1419 | switch (newvp->v_type) { |
| 1420 | case VDIR: |
| 1421 | delay = dirdelay; |
| 1422 | break; |
| 1423 | case VCHR: |
| 1424 | case VBLK: |
| 1425 | if (newvp->v_rdev && |
| 1426 | newvp->v_rdev->si_mountpoint != NULL) { |
| 1427 | delay = metadelay; |
| 1428 | break; |
| 1429 | } |
| 1430 | /* fall through */ |
| 1431 | default: |
| 1432 | delay = filedelay; |
| 1433 | } |
| 1434 | vn_syncer_add_to_worklist(newvp, delay); |
| 1435 | } |
| 1436 | bp->b_xflags |= BX_VNDIRTY; |
| 1437 | tbp = TAILQ_FIRST(listheadp); |
| 1438 | if (tbp == NULL || |
| 1439 | bp->b_lblkno == 0 || |
| 1440 | (bp->b_lblkno > 0 && tbp->b_lblkno < 0) || |
| 1441 | (bp->b_lblkno > 0 && bp->b_lblkno < tbp->b_lblkno)) { |
| 1442 | TAILQ_INSERT_HEAD(listheadp, bp, b_vnbufs); |
| 1443 | ++reassignbufsortgood; |
| 1444 | } else if (bp->b_lblkno < 0) { |
| 1445 | TAILQ_INSERT_TAIL(listheadp, bp, b_vnbufs); |
| 1446 | ++reassignbufsortgood; |
| 1447 | } else if (reassignbufmethod == 1) { |
| 1448 | /* |
| 1449 | * New sorting algorithm, only handle sequential case, |
| 1450 | * otherwise append to end (but before metadata) |
| 1451 | */ |
| 1452 | if ((tbp = gbincore(newvp, bp->b_lblkno - 1)) != NULL && |
| 1453 | (tbp->b_xflags & BX_VNDIRTY)) { |
| 1454 | /* |
| 1455 | * Found the best place to insert the buffer |
| 1456 | */ |
| 1457 | TAILQ_INSERT_AFTER(listheadp, tbp, bp, b_vnbufs); |
| 1458 | ++reassignbufsortgood; |
| 1459 | } else { |
| 1460 | /* |
| 1461 | * Missed, append to end, but before meta-data. |
| 1462 | * We know that the head buffer in the list is |
| 1463 | * not meta-data due to prior conditionals. |
| 1464 | * |
| 1465 | * Indirect effects: NFS second stage write |
| 1466 | * tends to wind up here, giving maximum |
| 1467 | * distance between the unstable write and the |
| 1468 | * commit rpc. |
| 1469 | */ |
| 1470 | tbp = TAILQ_LAST(listheadp, buflists); |
| 1471 | while (tbp && tbp->b_lblkno < 0) |
| 1472 | tbp = TAILQ_PREV(tbp, buflists, b_vnbufs); |
| 1473 | TAILQ_INSERT_AFTER(listheadp, tbp, bp, b_vnbufs); |
| 1474 | ++reassignbufsortbad; |
| 1475 | } |
| 1476 | } else { |
| 1477 | /* |
| 1478 | * Old sorting algorithm, scan queue and insert |
| 1479 | */ |
| 1480 | struct buf *ttbp; |
| 1481 | while ((ttbp = TAILQ_NEXT(tbp, b_vnbufs)) && |
| 1482 | (ttbp->b_lblkno < bp->b_lblkno)) { |
| 1483 | ++reassignbufloops; |
| 1484 | tbp = ttbp; |
| 1485 | } |
| 1486 | TAILQ_INSERT_AFTER(listheadp, tbp, bp, b_vnbufs); |
| 1487 | } |
| 1488 | } else { |
| 1489 | bp->b_xflags |= BX_VNCLEAN; |
| 1490 | TAILQ_INSERT_TAIL(&newvp->v_cleanblkhd, bp, b_vnbufs); |
| 1491 | if ((newvp->v_flag & VONWORKLST) && |
| 1492 | TAILQ_EMPTY(&newvp->v_dirtyblkhd)) { |
| 1493 | newvp->v_flag &= ~VONWORKLST; |
| 1494 | LIST_REMOVE(newvp, v_synclist); |
| 1495 | } |
| 1496 | } |
| 1497 | if (bp->b_vp != newvp) { |
| 1498 | bp->b_vp = newvp; |
| 1499 | vhold(bp->b_vp); |
| 1500 | } |
| 1501 | splx(s); |
| 1502 | } |
| 1503 | |
| 1504 | /* |
| 1505 | * Create a vnode for a block device. |
| 1506 | * Used for mounting the root file system. |
| 1507 | */ |
| 1508 | int |
| 1509 | bdevvp(dev_t dev, struct vnode **vpp) |
| 1510 | { |
| 1511 | struct vnode *vp; |
| 1512 | struct vnode *nvp; |
| 1513 | int error; |
| 1514 | |
| 1515 | if (dev == NODEV) { |
| 1516 | *vpp = NULLVP; |
| 1517 | return (ENXIO); |
| 1518 | } |
| 1519 | error = getnewvnode(VT_NON, (struct mount *)0, spec_vnodeop_p, &nvp); |
| 1520 | if (error) { |
| 1521 | *vpp = NULLVP; |
| 1522 | return (error); |
| 1523 | } |
| 1524 | vp = nvp; |
| 1525 | vp->v_type = VCHR; |
| 1526 | vp->v_udev = dev->si_udev; |
| 1527 | *vpp = vp; |
| 1528 | return (0); |
| 1529 | } |
| 1530 | |
| 1531 | int |
| 1532 | v_associate_rdev(struct vnode *vp, dev_t dev) |
| 1533 | { |
| 1534 | lwkt_tokref ilock; |
| 1535 | |
| 1536 | if (dev == NULL || dev == NODEV) |
| 1537 | return(ENXIO); |
| 1538 | if (dev_is_good(dev) == 0) |
| 1539 | return(ENXIO); |
| 1540 | KKASSERT(vp->v_rdev == NULL); |
| 1541 | if (dev_ref_debug) |
| 1542 | printf("Z1"); |
| 1543 | vp->v_rdev = reference_dev(dev); |
| 1544 | lwkt_gettoken(&ilock, &spechash_token); |
| 1545 | SLIST_INSERT_HEAD(&dev->si_hlist, vp, v_specnext); |
| 1546 | lwkt_reltoken(&ilock); |
| 1547 | return(0); |
| 1548 | } |
| 1549 | |
| 1550 | void |
| 1551 | v_release_rdev(struct vnode *vp) |
| 1552 | { |
| 1553 | lwkt_tokref ilock; |
| 1554 | dev_t dev; |
| 1555 | |
| 1556 | if ((dev = vp->v_rdev) != NULL) { |
| 1557 | lwkt_gettoken(&ilock, &spechash_token); |
| 1558 | SLIST_REMOVE(&dev->si_hlist, vp, vnode, v_specnext); |
| 1559 | if (dev_ref_debug && vp->v_opencount != 0) { |
| 1560 | printf("releasing rdev with non-0 " |
| 1561 | "v_opencount(%d) (revoked?)\n", |
| 1562 | vp->v_opencount); |
| 1563 | } |
| 1564 | vp->v_rdev = NULL; |
| 1565 | vp->v_opencount = 0; |
| 1566 | release_dev(dev); |
| 1567 | lwkt_reltoken(&ilock); |
| 1568 | } |
| 1569 | } |
| 1570 | |
| 1571 | /* |
| 1572 | * Add a vnode to the alias list hung off the dev_t. We only associate |
| 1573 | * the device number with the vnode. The actual device is not associated |
| 1574 | * until the vnode is opened (usually in spec_open()), and will be |
| 1575 | * disassociated on last close. |
| 1576 | */ |
| 1577 | void |
| 1578 | addaliasu(struct vnode *nvp, udev_t nvp_udev) |
| 1579 | { |
| 1580 | if (nvp->v_type != VBLK && nvp->v_type != VCHR) |
| 1581 | panic("addaliasu on non-special vnode"); |
| 1582 | nvp->v_udev = nvp_udev; |
| 1583 | } |
| 1584 | |
| 1585 | /* |
| 1586 | * Grab a particular vnode from the free list, increment its |
| 1587 | * reference count and lock it. The vnode lock bit is set if the |
| 1588 | * vnode is being eliminated in vgone. The process is awakened |
| 1589 | * when the transition is completed, and an error returned to |
| 1590 | * indicate that the vnode is no longer usable (possibly having |
| 1591 | * been changed to a new file system type). |
| 1592 | * |
| 1593 | * This code is very sensitive. We are depending on the vnode interlock |
| 1594 | * to be maintained through to the vn_lock() call, which means that we |
| 1595 | * cannot block which means that we cannot call vbusy() until after vn_lock(). |
| 1596 | * If the interlock is not maintained, the VXLOCK check will not properly |
| 1597 | * interlock against a vclean()'s LK_DRAIN operation on the lock. |
| 1598 | */ |
| 1599 | int |
| 1600 | vget(struct vnode *vp, lwkt_tokref_t vlock, int flags, thread_t td) |
| 1601 | { |
| 1602 | int error; |
| 1603 | lwkt_tokref vvlock; |
| 1604 | |
| 1605 | /* |
| 1606 | * We need the interlock to safely modify the v_ fields. ZZZ it is |
| 1607 | * only legal to pass (1) the vnode's interlock and (2) only pass |
| 1608 | * NULL w/o LK_INTERLOCK if the vnode is *ALREADY* referenced or |
| 1609 | * held. |
| 1610 | */ |
| 1611 | if ((flags & LK_INTERLOCK) == 0) { |
| 1612 | lwkt_gettoken(&vvlock, vp->v_interlock); |
| 1613 | vlock = &vvlock; |
| 1614 | } |
| 1615 | |
| 1616 | /* |
| 1617 | * If the vnode is in the process of being cleaned out for |
| 1618 | * another use, we wait for the cleaning to finish and then |
| 1619 | * return failure. Cleaning is determined by checking that |
| 1620 | * the VXLOCK flag is set. It is possible for the vnode to be |
| 1621 | * self-referenced during the cleaning operation. |
| 1622 | */ |
| 1623 | if (vp->v_flag & VXLOCK) { |
| 1624 | if (vp->v_vxthread == curthread) { |
| 1625 | #if 0 |
| 1626 | /* this can now occur in normal operation */ |
| 1627 | log(LOG_INFO, "VXLOCK interlock avoided\n"); |
| 1628 | #endif |
| 1629 | } else { |
| 1630 | vp->v_flag |= VXWANT; |
| 1631 | lwkt_reltoken(vlock); |
| 1632 | tsleep((caddr_t)vp, 0, "vget", 0); |
| 1633 | return (ENOENT); |
| 1634 | } |
| 1635 | } |
| 1636 | |
| 1637 | /* |
| 1638 | * Bump v_usecount to prevent the vnode from being recycled. The |
| 1639 | * usecount needs to be bumped before we successfully get our lock. |
| 1640 | */ |
| 1641 | vp->v_usecount++; |
| 1642 | if (flags & LK_TYPE_MASK) { |
| 1643 | if ((error = vn_lock(vp, vlock, flags | LK_INTERLOCK, td)) != 0) { |
| 1644 | /* |
| 1645 | * must expand vrele here because we do not want |
| 1646 | * to call VOP_INACTIVE if the reference count |
| 1647 | * drops back to zero since it was never really |
| 1648 | * active. We must remove it from the free list |
| 1649 | * before sleeping so that multiple processes do |
| 1650 | * not try to recycle it. |
| 1651 | */ |
| 1652 | lwkt_gettokref(vlock); |
| 1653 | vp->v_usecount--; |
| 1654 | vmaybefree(vp); |
| 1655 | lwkt_reltoken(vlock); |
| 1656 | } |
| 1657 | return (error); |
| 1658 | } |
| 1659 | if (VSHOULDBUSY(vp)) |
| 1660 | vbusy(vp); /* interlock must be held on call */ |
| 1661 | lwkt_reltoken(vlock); |
| 1662 | return (0); |
| 1663 | } |
| 1664 | |
| 1665 | void |
| 1666 | vref(struct vnode *vp) |
| 1667 | { |
| 1668 | crit_enter(); /* YYY use crit section for moment / BGL protected */ |
| 1669 | vp->v_usecount++; |
| 1670 | crit_exit(); |
| 1671 | } |
| 1672 | |
| 1673 | /* |
| 1674 | * Vnode put/release. |
| 1675 | * If count drops to zero, call inactive routine and return to freelist. |
| 1676 | */ |
| 1677 | void |
| 1678 | vrele(struct vnode *vp) |
| 1679 | { |
| 1680 | struct thread *td = curthread; /* XXX */ |
| 1681 | lwkt_tokref vlock; |
| 1682 | |
| 1683 | KASSERT(vp != NULL && vp->v_usecount >= 0, |
| 1684 | ("vrele: null vp or <=0 v_usecount")); |
| 1685 | |
| 1686 | lwkt_gettoken(&vlock, vp->v_interlock); |
| 1687 | |
| 1688 | if (vp->v_usecount > 1) { |
| 1689 | vp->v_usecount--; |
| 1690 | lwkt_reltoken(&vlock); |
| 1691 | return; |
| 1692 | } |
| 1693 | |
| 1694 | if (vp->v_usecount == 1) { |
| 1695 | vp->v_usecount--; |
| 1696 | /* |
| 1697 | * We must call VOP_INACTIVE with the node locked and the |
| 1698 | * usecount 0. If we are doing a vpu, the node is already |
| 1699 | * locked, but, in the case of vrele, we must explicitly lock |
| 1700 | * the vnode before calling VOP_INACTIVE. |
| 1701 | */ |
| 1702 | |
| 1703 | if (vn_lock(vp, NULL, LK_EXCLUSIVE, td) == 0) |
| 1704 | VOP_INACTIVE(vp, td); |
| 1705 | vmaybefree(vp); |
| 1706 | lwkt_reltoken(&vlock); |
| 1707 | } else { |
| 1708 | #ifdef DIAGNOSTIC |
| 1709 | vprint("vrele: negative ref count", vp); |
| 1710 | #endif |
| 1711 | lwkt_reltoken(&vlock); |
| 1712 | panic("vrele: negative ref cnt"); |
| 1713 | } |
| 1714 | } |
| 1715 | |
| 1716 | void |
| 1717 | vput(struct vnode *vp) |
| 1718 | { |
| 1719 | struct thread *td = curthread; /* XXX */ |
| 1720 | lwkt_tokref vlock; |
| 1721 | |
| 1722 | KASSERT(vp != NULL, ("vput: null vp")); |
| 1723 | |
| 1724 | lwkt_gettoken(&vlock, vp->v_interlock); |
| 1725 | |
| 1726 | if (vp->v_usecount > 1) { |
| 1727 | vp->v_usecount--; |
| 1728 | VOP_UNLOCK(vp, &vlock, LK_INTERLOCK, td); |
| 1729 | return; |
| 1730 | } |
| 1731 | |
| 1732 | if (vp->v_usecount == 1) { |
| 1733 | vp->v_usecount--; |
| 1734 | /* |
| 1735 | * We must call VOP_INACTIVE with the node locked. |
| 1736 | * If we are doing a vpu, the node is already locked, |
| 1737 | * so we just need to release the vnode mutex. |
| 1738 | */ |
| 1739 | VOP_INACTIVE(vp, td); |
| 1740 | vmaybefree(vp); |
| 1741 | lwkt_reltoken(&vlock); |
| 1742 | } else { |
| 1743 | #ifdef DIAGNOSTIC |
| 1744 | vprint("vput: negative ref count", vp); |
| 1745 | #endif |
| 1746 | lwkt_reltoken(&vlock); |
| 1747 | panic("vput: negative ref cnt"); |
| 1748 | } |
| 1749 | } |
| 1750 | |
| 1751 | /* |
| 1752 | * Somebody doesn't want the vnode recycled. ZZZ vnode interlock should |
| 1753 | * be held but isn't. |
| 1754 | */ |
| 1755 | void |
| 1756 | vhold(struct vnode *vp) |
| 1757 | { |
| 1758 | int s; |
| 1759 | |
| 1760 | s = splbio(); |
| 1761 | vp->v_holdcnt++; |
| 1762 | if (VSHOULDBUSY(vp)) |
| 1763 | vbusy(vp); /* interlock must be held on call */ |
| 1764 | splx(s); |
| 1765 | } |
| 1766 | |
| 1767 | /* |
| 1768 | * One less who cares about this vnode. |
| 1769 | */ |
| 1770 | void |
| 1771 | vdrop(struct vnode *vp) |
| 1772 | { |
| 1773 | lwkt_tokref vlock; |
| 1774 | |
| 1775 | lwkt_gettoken(&vlock, vp->v_interlock); |
| 1776 | if (vp->v_holdcnt <= 0) |
| 1777 | panic("vdrop: holdcnt"); |
| 1778 | vp->v_holdcnt--; |
| 1779 | vmaybefree(vp); |
| 1780 | lwkt_reltoken(&vlock); |
| 1781 | } |
| 1782 | |
| 1783 | int |
| 1784 | vmntvnodescan( |
| 1785 | struct mount *mp, |
| 1786 | int (*fastfunc)(struct mount *mp, struct vnode *vp, void *data), |
| 1787 | int (*slowfunc)(struct mount *mp, struct vnode *vp, |
| 1788 | lwkt_tokref_t vlock, void *data), |
| 1789 | void *data |
| 1790 | ) { |
| 1791 | lwkt_tokref ilock; |
| 1792 | lwkt_tokref vlock; |
| 1793 | struct vnode *pvp; |
| 1794 | struct vnode *vp; |
| 1795 | int r = 0; |
| 1796 | |
| 1797 | /* |
| 1798 | * Scan the vnodes on the mount's vnode list. Use a placemarker |
| 1799 | */ |
| 1800 | pvp = zalloc(vnode_zone); |
| 1801 | pvp->v_flag |= VPLACEMARKER; |
| 1802 | |
| 1803 | lwkt_gettoken(&ilock, &mntvnode_token); |
| 1804 | TAILQ_INSERT_HEAD(&mp->mnt_nvnodelist, pvp, v_nmntvnodes); |
| 1805 | |
| 1806 | while ((vp = TAILQ_NEXT(pvp, v_nmntvnodes)) != NULL) { |
| 1807 | /* |
| 1808 | * Move the placemarker and skip other placemarkers we |
| 1809 | * encounter. The nothing can get in our way so the |
| 1810 | * mount point on the vp must be valid. |
| 1811 | */ |
| 1812 | TAILQ_REMOVE(&mp->mnt_nvnodelist, pvp, v_nmntvnodes); |
| 1813 | TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, pvp, v_nmntvnodes); |
| 1814 | if (vp->v_flag & VPLACEMARKER) |
| 1815 | continue; |
| 1816 | KKASSERT(vp->v_mount == mp); |
| 1817 | |
| 1818 | /* |
| 1819 | * Quick test |
| 1820 | */ |
| 1821 | if (fastfunc) { |
| 1822 | if ((r = fastfunc(mp, vp, data)) < 0) |
| 1823 | continue; |
| 1824 | if (r) |
| 1825 | break; |
| 1826 | } |
| 1827 | |
| 1828 | /* |
| 1829 | * Get the vnodes interlock and make sure it is still on the |
| 1830 | * mount list. Skip it if it has moved (we may encounter it |
| 1831 | * later). Then do the with-interlock test. The callback |
| 1832 | * is responsible for releasing the vnode interlock. |
| 1833 | * |
| 1834 | * The interlock is type-stable. |
| 1835 | */ |
| 1836 | if (slowfunc) { |
| 1837 | lwkt_gettoken(&vlock, vp->v_interlock); |
| 1838 | if (vp != TAILQ_PREV(pvp, vnodelst, v_nmntvnodes)) { |
| 1839 | printf("vmntvnodescan (debug info only): f=%p vp=%p vnode ripped out from under us\n", slowfunc, vp); |
| 1840 | lwkt_reltoken(&vlock); |
| 1841 | continue; |
| 1842 | } |
| 1843 | if ((r = slowfunc(mp, vp, &vlock, data)) != 0) { |
| 1844 | KKASSERT(lwkt_havetokref(&vlock) == 0); |
| 1845 | break; |
| 1846 | } |
| 1847 | KKASSERT(lwkt_havetokref(&vlock) == 0); |
| 1848 | } |
| 1849 | } |
| 1850 | TAILQ_REMOVE(&mp->mnt_nvnodelist, pvp, v_nmntvnodes); |
| 1851 | zfree(vnode_zone, pvp); |
| 1852 | lwkt_reltoken(&ilock); |
| 1853 | return(r); |
| 1854 | } |
| 1855 | |
| 1856 | /* |
| 1857 | * Remove any vnodes in the vnode table belonging to mount point mp. |
| 1858 | * |
| 1859 | * If FORCECLOSE is not specified, there should not be any active ones, |
| 1860 | * return error if any are found (nb: this is a user error, not a |
| 1861 | * system error). If FORCECLOSE is specified, detach any active vnodes |
| 1862 | * that are found. |
| 1863 | * |
| 1864 | * If WRITECLOSE is set, only flush out regular file vnodes open for |
| 1865 | * writing. |
| 1866 | * |
| 1867 | * SKIPSYSTEM causes any vnodes marked VSYSTEM to be skipped. |
| 1868 | * |
| 1869 | * `rootrefs' specifies the base reference count for the root vnode |
| 1870 | * of this filesystem. The root vnode is considered busy if its |
| 1871 | * v_usecount exceeds this value. On a successful return, vflush() |
| 1872 | * will call vrele() on the root vnode exactly rootrefs times. |
| 1873 | * If the SKIPSYSTEM or WRITECLOSE flags are specified, rootrefs must |
| 1874 | * be zero. |
| 1875 | */ |
| 1876 | #ifdef DIAGNOSTIC |
| 1877 | static int busyprt = 0; /* print out busy vnodes */ |
| 1878 | SYSCTL_INT(_debug, OID_AUTO, busyprt, CTLFLAG_RW, &busyprt, 0, ""); |
| 1879 | #endif |
| 1880 | |
| 1881 | static int vflush_scan(struct mount *mp, struct vnode *vp, |
| 1882 | lwkt_tokref_t vlock, void *data); |
| 1883 | |
| 1884 | struct vflush_info { |
| 1885 | int flags; |
| 1886 | int busy; |
| 1887 | thread_t td; |
| 1888 | }; |
| 1889 | |
| 1890 | int |
| 1891 | vflush(struct mount *mp, int rootrefs, int flags) |
| 1892 | { |
| 1893 | struct thread *td = curthread; /* XXX */ |
| 1894 | struct vnode *rootvp = NULL; |
| 1895 | int error; |
| 1896 | lwkt_tokref vlock; |
| 1897 | struct vflush_info vflush_info; |
| 1898 | |
| 1899 | if (rootrefs > 0) { |
| 1900 | KASSERT((flags & (SKIPSYSTEM | WRITECLOSE)) == 0, |
| 1901 | ("vflush: bad args")); |
| 1902 | /* |
| 1903 | * Get the filesystem root vnode. We can vput() it |
| 1904 | * immediately, since with rootrefs > 0, it won't go away. |
| 1905 | */ |
| 1906 | if ((error = VFS_ROOT(mp, &rootvp)) != 0) |
| 1907 | return (error); |
| 1908 | vput(rootvp); |
| 1909 | } |
| 1910 | |
| 1911 | vflush_info.busy = 0; |
| 1912 | vflush_info.flags = flags; |
| 1913 | vflush_info.td = td; |
| 1914 | vmntvnodescan(mp, NULL, vflush_scan, &vflush_info); |
| 1915 | |
| 1916 | if (rootrefs > 0 && (flags & FORCECLOSE) == 0) { |
| 1917 | /* |
| 1918 | * If just the root vnode is busy, and if its refcount |
| 1919 | * is equal to `rootrefs', then go ahead and kill it. |
| 1920 | */ |
| 1921 | lwkt_gettoken(&vlock, rootvp->v_interlock); |
| 1922 | KASSERT(vflush_info.busy > 0, ("vflush: not busy")); |
| 1923 | KASSERT(rootvp->v_usecount >= rootrefs, ("vflush: rootrefs")); |
| 1924 | if (vflush_info.busy == 1 && rootvp->v_usecount == rootrefs) { |
| 1925 | vgonel(rootvp, &vlock, td); |
| 1926 | vflush_info.busy = 0; |
| 1927 | } else { |
| 1928 | lwkt_reltoken(&vlock); |
| 1929 | } |
| 1930 | } |
| 1931 | if (vflush_info.busy) |
| 1932 | return (EBUSY); |
| 1933 | for (; rootrefs > 0; rootrefs--) |
| 1934 | vrele(rootvp); |
| 1935 | return (0); |
| 1936 | } |
| 1937 | |
| 1938 | /* |
| 1939 | * The scan callback is made with an interlocked vnode. |
| 1940 | */ |
| 1941 | static int |
| 1942 | vflush_scan(struct mount *mp, struct vnode *vp, |
| 1943 | lwkt_tokref_t vlock, void *data) |
| 1944 | { |
| 1945 | struct vflush_info *info = data; |
| 1946 | struct vattr vattr; |
| 1947 | |
| 1948 | /* |
| 1949 | * Skip over a vnodes marked VSYSTEM. |
| 1950 | */ |
| 1951 | if ((info->flags & SKIPSYSTEM) && (vp->v_flag & VSYSTEM)) { |
| 1952 | lwkt_reltoken(vlock); |
| 1953 | return(0); |
| 1954 | } |
| 1955 | |
| 1956 | /* |
| 1957 | * If WRITECLOSE is set, flush out unlinked but still open |
| 1958 | * files (even if open only for reading) and regular file |
| 1959 | * vnodes open for writing. |
| 1960 | */ |
| 1961 | if ((info->flags & WRITECLOSE) && |
| 1962 | (vp->v_type == VNON || |
| 1963 | (VOP_GETATTR(vp, &vattr, info->td) == 0 && |
| 1964 | vattr.va_nlink > 0)) && |
| 1965 | (vp->v_writecount == 0 || vp->v_type != VREG)) { |
| 1966 | lwkt_reltoken(vlock); |
| 1967 | return(0); |
| 1968 | } |
| 1969 | |
| 1970 | /* |
| 1971 | * With v_usecount == 0, all we need to do is clear out the |
| 1972 | * vnode data structures and we are done. |
| 1973 | */ |
| 1974 | if (vp->v_usecount == 0) { |
| 1975 | vgonel(vp, vlock, info->td); |
| 1976 | return(0); |
| 1977 | } |
| 1978 | |
| 1979 | /* |
| 1980 | * If FORCECLOSE is set, forcibly close the vnode. For block |
| 1981 | * or character devices, revert to an anonymous device. For |
| 1982 | * all other files, just kill them. |
| 1983 | */ |
| 1984 | if (info->flags & FORCECLOSE) { |
| 1985 | if (vp->v_type != VBLK && vp->v_type != VCHR) { |
| 1986 | vgonel(vp, vlock, info->td); |
| 1987 | } else { |
| 1988 | vclean(vp, vlock, 0, info->td); |
| 1989 | vp->v_op = spec_vnodeop_p; |
| 1990 | insmntque(vp, (struct mount *) 0); |
| 1991 | } |
| 1992 | return(0); |
| 1993 | } |
| 1994 | #ifdef DIAGNOSTIC |
| 1995 | if (busyprt) |
| 1996 | vprint("vflush: busy vnode", vp); |
| 1997 | #endif |
| 1998 | lwkt_reltoken(vlock); |
| 1999 | ++info->busy; |
| 2000 | return(0); |
| 2001 | } |
| 2002 | |
| 2003 | /* |
| 2004 | * Disassociate the underlying file system from a vnode. |
| 2005 | */ |
| 2006 | static void |
| 2007 | vclean(struct vnode *vp, lwkt_tokref_t vlock, int flags, struct thread *td) |
| 2008 | { |
| 2009 | int active; |
| 2010 | |
| 2011 | /* |
| 2012 | * Check to see if the vnode is in use. If so we have to reference it |
| 2013 | * before we clean it out so that its count cannot fall to zero and |
| 2014 | * generate a race against ourselves to recycle it. |
| 2015 | */ |
| 2016 | if ((active = vp->v_usecount)) |
| 2017 | vp->v_usecount++; |
| 2018 | |
| 2019 | /* |
| 2020 | * Prevent the vnode from being recycled or brought into use while we |
| 2021 | * clean it out. |
| 2022 | */ |
| 2023 | if (vp->v_flag & VXLOCK) |
| 2024 | panic("vclean: deadlock"); |
| 2025 | vp->v_flag |= VXLOCK; |
| 2026 | vp->v_vxthread = curthread; |
| 2027 | |
| 2028 | /* |
| 2029 | * Even if the count is zero, the VOP_INACTIVE routine may still |
| 2030 | * have the object locked while it cleans it out. The VOP_LOCK |
| 2031 | * ensures that the VOP_INACTIVE routine is done with its work. |
| 2032 | * For active vnodes, it ensures that no other activity can |
| 2033 | * occur while the underlying object is being cleaned out. |
| 2034 | * |
| 2035 | * NOTE: we continue to hold the vnode interlock through to the |
| 2036 | * end of vclean(). |
| 2037 | */ |
| 2038 | VOP_LOCK(vp, NULL, LK_DRAIN, td); |
| 2039 | |
| 2040 | /* |
| 2041 | * Clean out any buffers associated with the vnode. |
| 2042 | */ |
| 2043 | vinvalbuf(vp, V_SAVE, td, 0, 0); |
| 2044 | VOP_DESTROYVOBJECT(vp); |
| 2045 | |
| 2046 | /* |
| 2047 | * If purging an active vnode, it must be closed and |
| 2048 | * deactivated before being reclaimed. Note that the |
| 2049 | * VOP_INACTIVE will unlock the vnode. |
| 2050 | */ |
| 2051 | if (active) { |
| 2052 | if (flags & DOCLOSE) |
| 2053 | VOP_CLOSE(vp, FNONBLOCK, td); |
| 2054 | VOP_INACTIVE(vp, td); |
| 2055 | } else { |
| 2056 | /* |
| 2057 | * Any other processes trying to obtain this lock must first |
| 2058 | * wait for VXLOCK to clear, then call the new lock operation. |
| 2059 | */ |
| 2060 | VOP_UNLOCK(vp, NULL, 0, td); |
| 2061 | } |
| 2062 | /* |
| 2063 | * Reclaim the vnode. |
| 2064 | */ |
| 2065 | if (VOP_RECLAIM(vp, td)) |
| 2066 | panic("vclean: cannot reclaim"); |
| 2067 | |
| 2068 | if (active) { |
| 2069 | /* |
| 2070 | * Inline copy of vrele() since VOP_INACTIVE |
| 2071 | * has already been called. |
| 2072 | */ |
| 2073 | if (--vp->v_usecount <= 0) { |
| 2074 | #ifdef DIAGNOSTIC |
| 2075 | if (vp->v_usecount < 0 || vp->v_writecount != 0) { |
| 2076 | vprint("vclean: bad ref count", vp); |
| 2077 | panic("vclean: ref cnt"); |
| 2078 | } |
| 2079 | #endif |
| 2080 | vfree(vp); |
| 2081 | } |
| 2082 | } |
| 2083 | |
| 2084 | cache_purge(vp); |
| 2085 | vp->v_vnlock = NULL; |
| 2086 | vmaybefree(vp); |
| 2087 | |
| 2088 | /* |
| 2089 | * Done with purge, notify sleepers of the grim news. |
| 2090 | */ |
| 2091 | vp->v_op = dead_vnodeop_p; |
| 2092 | vn_pollgone(vp); |
| 2093 | vp->v_tag = VT_NON; |
| 2094 | vp->v_flag &= ~VXLOCK; |
| 2095 | vp->v_vxthread = NULL; |
| 2096 | if (vp->v_flag & VXWANT) { |
| 2097 | vp->v_flag &= ~VXWANT; |
| 2098 | wakeup((caddr_t) vp); |
| 2099 | } |
| 2100 | lwkt_reltoken(vlock); |
| 2101 | } |
| 2102 | |
| 2103 | /* |
| 2104 | * Eliminate all activity associated with the requested vnode |
| 2105 | * and with all vnodes aliased to the requested vnode. |
| 2106 | * |
| 2107 | * revoke { struct vnode *a_vp, int a_flags } |
| 2108 | */ |
| 2109 | int |
| 2110 | vop_revoke(struct vop_revoke_args *ap) |
| 2111 | { |
| 2112 | struct vnode *vp, *vq; |
| 2113 | lwkt_tokref ilock; |
| 2114 | dev_t dev; |
| 2115 | |
| 2116 | KASSERT((ap->a_flags & REVOKEALL) != 0, ("vop_revoke")); |
| 2117 | |
| 2118 | vp = ap->a_vp; |
| 2119 | /* |
| 2120 | * If a vgone (or vclean) is already in progress, |
| 2121 | * wait until it is done and return. |
| 2122 | */ |
| 2123 | if (vp->v_flag & VXLOCK) { |
| 2124 | vp->v_flag |= VXWANT; |
| 2125 | /*lwkt_reltoken(vlock); ZZZ */ |
| 2126 | tsleep((caddr_t)vp, 0, "vop_revokeall", 0); |
| 2127 | return (0); |
| 2128 | } |
| 2129 | |
| 2130 | /* |
| 2131 | * If the vnode has a device association, scrap all vnodes associated |
| 2132 | * with the device. Don't let the device disappear on us while we |
| 2133 | * are scrapping the vnodes. |
| 2134 | */ |
| 2135 | if (vp->v_type != VCHR && vp->v_type != VBLK) |
| 2136 | return(0); |
| 2137 | if ((dev = vp->v_rdev) == NULL) { |
| 2138 | if ((dev = udev2dev(vp->v_udev, vp->v_type == VBLK)) == NODEV) |
| 2139 | return(0); |
| 2140 | } |
| 2141 | reference_dev(dev); |
| 2142 | for (;;) { |
| 2143 | lwkt_gettoken(&ilock, &spechash_token); |
| 2144 | vq = SLIST_FIRST(&dev->si_hlist); |
| 2145 | lwkt_reltoken(&ilock); |
| 2146 | if (vq == NULL) |
| 2147 | break; |
| 2148 | vgone(vq); |
| 2149 | } |
| 2150 | release_dev(dev); |
| 2151 | return (0); |
| 2152 | } |
| 2153 | |
| 2154 | /* |
| 2155 | * Recycle an unused vnode to the front of the free list. |
| 2156 | * Release the passed interlock if the vnode will be recycled. |
| 2157 | */ |
| 2158 | int |
| 2159 | vrecycle(struct vnode *vp, lwkt_tokref_t inter_lkp, struct thread *td) |
| 2160 | { |
| 2161 | lwkt_tokref vlock; |
| 2162 | |
| 2163 | lwkt_gettoken(&vlock, vp->v_interlock); |
| 2164 | if (vp->v_usecount == 0) { |
| 2165 | if (inter_lkp) |
| 2166 | lwkt_reltoken(inter_lkp); |
| 2167 | vgonel(vp, &vlock, td); |
| 2168 | return (1); |
| 2169 | } |
| 2170 | lwkt_reltoken(&vlock); |
| 2171 | return (0); |
| 2172 | } |
| 2173 | |
| 2174 | /* |
| 2175 | * Eliminate all activity associated with a vnode |
| 2176 | * in preparation for reuse. |
| 2177 | */ |
| 2178 | void |
| 2179 | vgone(struct vnode *vp) |
| 2180 | { |
| 2181 | struct thread *td = curthread; /* XXX */ |
| 2182 | lwkt_tokref vlock; |
| 2183 | |
| 2184 | lwkt_gettoken(&vlock, vp->v_interlock); |
| 2185 | vgonel(vp, &vlock, td); |
| 2186 | } |
| 2187 | |
| 2188 | /* |
| 2189 | * vgone, with the vp interlock held. |
| 2190 | */ |
| 2191 | void |
| 2192 | vgonel(struct vnode *vp, lwkt_tokref_t vlock, struct thread *td) |
| 2193 | { |
| 2194 | lwkt_tokref ilock; |
| 2195 | int s; |
| 2196 | |
| 2197 | /* |
| 2198 | * If a vgone (or vclean) is already in progress, |
| 2199 | * wait until it is done and return. |
| 2200 | */ |
| 2201 | if (vp->v_flag & VXLOCK) { |
| 2202 | vp->v_flag |= VXWANT; |
| 2203 | lwkt_reltoken(vlock); |
| 2204 | tsleep((caddr_t)vp, 0, "vgone", 0); |
| 2205 | return; |
| 2206 | } |
| 2207 | |
| 2208 | /* |
| 2209 | * Clean out the filesystem specific data. |
| 2210 | */ |
| 2211 | vclean(vp, vlock, DOCLOSE, td); |
| 2212 | lwkt_gettokref(vlock); |
| 2213 | |
| 2214 | /* |
| 2215 | * Delete from old mount point vnode list, if on one. |
| 2216 | */ |
| 2217 | if (vp->v_mount != NULL) |
| 2218 | insmntque(vp, (struct mount *)0); |
| 2219 | |
| 2220 | /* |
| 2221 | * If special device, remove it from special device alias list |
| 2222 | * if it is on one. This should normally only occur if a vnode is |
| 2223 | * being revoked as the device should otherwise have been released |
| 2224 | * naturally. |
| 2225 | */ |
| 2226 | if ((vp->v_type == VBLK || vp->v_type == VCHR) && vp->v_rdev != NULL) { |
| 2227 | v_release_rdev(vp); |
| 2228 | } |
| 2229 | |
| 2230 | /* |
| 2231 | * If it is on the freelist and not already at the head, |
| 2232 | * move it to the head of the list. The test of the |
| 2233 | * VDOOMED flag and the reference count of zero is because |
| 2234 | * it will be removed from the free list by getnewvnode, |
| 2235 | * but will not have its reference count incremented until |
| 2236 | * after calling vgone. If the reference count were |
| 2237 | * incremented first, vgone would (incorrectly) try to |
| 2238 | * close the previous instance of the underlying object. |
| 2239 | */ |
| 2240 | if (vp->v_usecount == 0 && !(vp->v_flag & VDOOMED)) { |
| 2241 | s = splbio(); |
| 2242 | lwkt_gettoken(&ilock, &vnode_free_list_token); |
| 2243 | if (vp->v_flag & VFREE) |
| 2244 | TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); |
| 2245 | else |
| 2246 | freevnodes++; |
| 2247 | vp->v_flag |= VFREE; |
| 2248 | TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist); |
| 2249 | lwkt_reltoken(&ilock); |
| 2250 | splx(s); |
| 2251 | } |
| 2252 | vp->v_type = VBAD; |
| 2253 | lwkt_reltoken(vlock); |
| 2254 | } |
| 2255 | |
| 2256 | /* |
| 2257 | * Lookup a vnode by device number. |
| 2258 | */ |
| 2259 | int |
| 2260 | vfinddev(dev_t dev, enum vtype type, struct vnode **vpp) |
| 2261 | { |
| 2262 | lwkt_tokref ilock; |
| 2263 | struct vnode *vp; |
| 2264 | |
| 2265 | lwkt_gettoken(&ilock, &spechash_token); |
| 2266 | SLIST_FOREACH(vp, &dev->si_hlist, v_specnext) { |
| 2267 | if (type == vp->v_type) { |
| 2268 | *vpp = vp; |
| 2269 | lwkt_reltoken(&ilock); |
| 2270 | return (1); |
| 2271 | } |
| 2272 | } |
| 2273 | lwkt_reltoken(&ilock); |
| 2274 | return (0); |
| 2275 | } |
| 2276 | |
| 2277 | /* |
| 2278 | * Calculate the total number of references to a special device. This |
| 2279 | * routine may only be called for VBLK and VCHR vnodes since v_rdev is |
| 2280 | * an overloaded field. Since udev2dev can now return NODEV, we have |
| 2281 | * to check for a NULL v_rdev. |
| 2282 | */ |
| 2283 | int |
| 2284 | count_dev(dev_t dev) |
| 2285 | { |
| 2286 | lwkt_tokref ilock; |
| 2287 | struct vnode *vp; |
| 2288 | int count = 0; |
| 2289 | |
| 2290 | if (SLIST_FIRST(&dev->si_hlist)) { |
| 2291 | lwkt_gettoken(&ilock, &spechash_token); |
| 2292 | SLIST_FOREACH(vp, &dev->si_hlist, v_specnext) { |
| 2293 | count += vp->v_usecount; |
| 2294 | } |
| 2295 | lwkt_reltoken(&ilock); |
| 2296 | } |
| 2297 | return(count); |
| 2298 | } |
| 2299 | |
| 2300 | int |
| 2301 | count_udev(udev_t udev) |
| 2302 | { |
| 2303 | dev_t dev; |
| 2304 | |
| 2305 | if ((dev = udev2dev(udev, 0)) == NODEV) |
| 2306 | return(0); |
| 2307 | return(count_dev(dev)); |
| 2308 | } |
| 2309 | |
| 2310 | int |
| 2311 | vcount(struct vnode *vp) |
| 2312 | { |
| 2313 | if (vp->v_rdev == NULL) |
| 2314 | return(0); |
| 2315 | return(count_dev(vp->v_rdev)); |
| 2316 | } |
| 2317 | |
| 2318 | /* |
| 2319 | * Print out a description of a vnode. |
| 2320 | */ |
| 2321 | static char *typename[] = |
| 2322 | {"VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD"}; |
| 2323 | |
| 2324 | void |
| 2325 | vprint(char *label, struct vnode *vp) |
| 2326 | { |
| 2327 | char buf[96]; |
| 2328 | |
| 2329 | if (label != NULL) |
| 2330 | printf("%s: %p: ", label, (void *)vp); |
| 2331 | else |
| 2332 | printf("%p: ", (void *)vp); |
| 2333 | printf("type %s, usecount %d, writecount %d, refcount %d,", |
| 2334 | typename[vp->v_type], vp->v_usecount, vp->v_writecount, |
| 2335 | vp->v_holdcnt); |
| 2336 | buf[0] = '\0'; |
| 2337 | if (vp->v_flag & VROOT) |
| 2338 | strcat(buf, "|VROOT"); |
| 2339 | if (vp->v_flag & VTEXT) |
| 2340 | strcat(buf, "|VTEXT"); |
| 2341 | if (vp->v_flag & VSYSTEM) |
| 2342 | strcat(buf, "|VSYSTEM"); |
| 2343 | if (vp->v_flag & VXLOCK) |
| 2344 | strcat(buf, "|VXLOCK"); |
| 2345 | if (vp->v_flag & VXWANT) |
| 2346 | strcat(buf, "|VXWANT"); |
| 2347 | if (vp->v_flag & VBWAIT) |
| 2348 | strcat(buf, "|VBWAIT"); |
| 2349 | if (vp->v_flag & VDOOMED) |
| 2350 | strcat(buf, "|VDOOMED"); |
| 2351 | if (vp->v_flag & VFREE) |
| 2352 | strcat(buf, "|VFREE"); |
| 2353 | if (vp->v_flag & VOBJBUF) |
| 2354 | strcat(buf, "|VOBJBUF"); |
| 2355 | if (buf[0] != '\0') |
| 2356 | printf(" flags (%s)", &buf[1]); |
| 2357 | if (vp->v_data == NULL) { |
| 2358 | printf("\n"); |
| 2359 | } else { |
| 2360 | printf("\n\t"); |
| 2361 | VOP_PRINT(vp); |
| 2362 | } |
| 2363 | } |
| 2364 | |
| 2365 | #ifdef DDB |
| 2366 | #include <ddb/ddb.h> |
| 2367 | /* |
| 2368 | * List all of the locked vnodes in the system. |
| 2369 | * Called when debugging the kernel. |
| 2370 | */ |
| 2371 | DB_SHOW_COMMAND(lockedvnodes, lockedvnodes) |
| 2372 | { |
| 2373 | struct thread *td = curthread; /* XXX */ |
| 2374 | lwkt_tokref ilock; |
| 2375 | struct mount *mp, *nmp; |
| 2376 | struct vnode *vp; |
| 2377 | |
| 2378 | printf("Locked vnodes\n"); |
| 2379 | lwkt_gettoken(&ilock, &mountlist_token); |
| 2380 | for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { |
| 2381 | if (vfs_busy(mp, LK_NOWAIT, &ilock, td)) { |
| 2382 | nmp = TAILQ_NEXT(mp, mnt_list); |
| 2383 | continue; |
| 2384 | } |
| 2385 | TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes) { |
| 2386 | if (VOP_ISLOCKED(vp, NULL)) |
| 2387 | vprint((char *)0, vp); |
| 2388 | } |
| 2389 | lwkt_gettokref(&ilock); |
| 2390 | nmp = TAILQ_NEXT(mp, mnt_list); |
| 2391 | vfs_unbusy(mp, td); |
| 2392 | } |
| 2393 | lwkt_reltoken(&ilock); |
| 2394 | } |
| 2395 | #endif |
| 2396 | |
| 2397 | /* |
| 2398 | * Top level filesystem related information gathering. |
| 2399 | */ |
| 2400 | static int sysctl_ovfs_conf (SYSCTL_HANDLER_ARGS); |
| 2401 | |
| 2402 | static int |
| 2403 | vfs_sysctl(SYSCTL_HANDLER_ARGS) |
| 2404 | { |
| 2405 | int *name = (int *)arg1 - 1; /* XXX */ |
| 2406 | u_int namelen = arg2 + 1; /* XXX */ |
| 2407 | struct vfsconf *vfsp; |
| 2408 | |
| 2409 | #if 1 || defined(COMPAT_PRELITE2) |
| 2410 | /* Resolve ambiguity between VFS_VFSCONF and VFS_GENERIC. */ |
| 2411 | if (namelen == 1) |
| 2412 | return (sysctl_ovfs_conf(oidp, arg1, arg2, req)); |
| 2413 | #endif |
| 2414 | |
| 2415 | #ifdef notyet |
| 2416 | /* all sysctl names at this level are at least name and field */ |
| 2417 | if (namelen < 2) |
| 2418 | return (ENOTDIR); /* overloaded */ |
| 2419 | if (name[0] != VFS_GENERIC) { |
| 2420 | for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) |
| 2421 | if (vfsp->vfc_typenum == name[0]) |
| 2422 | break; |
| 2423 | if (vfsp == NULL) |
| 2424 | return (EOPNOTSUPP); |
| 2425 | return ((*vfsp->vfc_vfsops->vfs_sysctl)(&name[1], namelen - 1, |
| 2426 | oldp, oldlenp, newp, newlen, p)); |
| 2427 | } |
| 2428 | #endif |
| 2429 | switch (name[1]) { |
| 2430 | case VFS_MAXTYPENUM: |
| 2431 | if (namelen != 2) |
| 2432 | return (ENOTDIR); |
| 2433 | return (SYSCTL_OUT(req, &maxvfsconf, sizeof(int))); |
| 2434 | case VFS_CONF: |
| 2435 | if (namelen != 3) |
| 2436 | return (ENOTDIR); /* overloaded */ |
| 2437 | for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) |
| 2438 | if (vfsp->vfc_typenum == name[2]) |
| 2439 | break; |
| 2440 | if (vfsp == NULL) |
| 2441 | return (EOPNOTSUPP); |
| 2442 | return (SYSCTL_OUT(req, vfsp, sizeof *vfsp)); |
| 2443 | } |
| 2444 | return (EOPNOTSUPP); |
| 2445 | } |
| 2446 | |
| 2447 | SYSCTL_NODE(_vfs, VFS_GENERIC, generic, CTLFLAG_RD, vfs_sysctl, |
| 2448 | "Generic filesystem"); |
| 2449 | |
| 2450 | #if 1 || defined(COMPAT_PRELITE2) |
| 2451 | |
| 2452 | static int |
| 2453 | sysctl_ovfs_conf(SYSCTL_HANDLER_ARGS) |
| 2454 | { |
| 2455 | int error; |
| 2456 | struct vfsconf *vfsp; |
| 2457 | struct ovfsconf ovfs; |
| 2458 | |
| 2459 | for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) { |
| 2460 | ovfs.vfc_vfsops = vfsp->vfc_vfsops; /* XXX used as flag */ |
| 2461 | strcpy(ovfs.vfc_name, vfsp->vfc_name); |
| 2462 | ovfs.vfc_index = vfsp->vfc_typenum; |
| 2463 | ovfs.vfc_refcount = vfsp->vfc_refcount; |
| 2464 | ovfs.vfc_flags = vfsp->vfc_flags; |
| 2465 | error = SYSCTL_OUT(req, &ovfs, sizeof ovfs); |
| 2466 | if (error) |
| 2467 | return error; |
| 2468 | } |
| 2469 | return 0; |
| 2470 | } |
| 2471 | |
| 2472 | #endif /* 1 || COMPAT_PRELITE2 */ |
| 2473 | |
| 2474 | #if 0 |
| 2475 | #define KINFO_VNODESLOP 10 |
| 2476 | /* |
| 2477 | * Dump vnode list (via sysctl). |
| 2478 | * Copyout address of vnode followed by vnode. |
| 2479 | */ |
| 2480 | /* ARGSUSED */ |
| 2481 | static int |
| 2482 | sysctl_vnode(SYSCTL_HANDLER_ARGS) |
| 2483 | { |
| 2484 | struct proc *p = curproc; /* XXX */ |
| 2485 | struct mount *mp, *nmp; |
| 2486 | struct vnode *nvp, *vp; |
| 2487 | lwkt_tokref ilock; |
| 2488 | lwkt_tokref jlock; |
| 2489 | int error; |
| 2490 | |
| 2491 | #define VPTRSZ sizeof (struct vnode *) |
| 2492 | #define VNODESZ sizeof (struct vnode) |
| 2493 | |
| 2494 | req->lock = 0; |
| 2495 | if (!req->oldptr) /* Make an estimate */ |
| 2496 | return (SYSCTL_OUT(req, 0, |
| 2497 | (numvnodes + KINFO_VNODESLOP) * (VPTRSZ + VNODESZ))); |
| 2498 | |
| 2499 | lwkt_gettoken(&ilock, &mountlist_token); |
| 2500 | for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { |
| 2501 | if (vfs_busy(mp, LK_NOWAIT, &ilock, p)) { |
| 2502 | nmp = TAILQ_NEXT(mp, mnt_list); |
| 2503 | continue; |
| 2504 | } |
| 2505 | lwkt_gettoken(&jlock, &mntvnode_token); |
| 2506 | again: |
| 2507 | for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist); |
| 2508 | vp != NULL; |
| 2509 | vp = nvp) { |
| 2510 | /* |
| 2511 | * Check that the vp is still associated with |
| 2512 | * this filesystem. RACE: could have been |
| 2513 | * recycled onto the same filesystem. |
| 2514 | */ |
| 2515 | if (vp->v_mount != mp) |
| 2516 | goto again; |
| 2517 | nvp = TAILQ_NEXT(vp, v_nmntvnodes); |
| 2518 | if ((error = SYSCTL_OUT(req, &vp, VPTRSZ)) || |
| 2519 | (error = SYSCTL_OUT(req, vp, VNODESZ))) { |
| 2520 | lwkt_reltoken(&jlock); |
| 2521 | return (error); |
| 2522 | } |
| 2523 | } |
| 2524 | lwkt_reltoken(&jlock); |
| 2525 | lwkt_gettokref(&ilock); |
| 2526 | nmp = TAILQ_NEXT(mp, mnt_list); /* ZZZ */ |
| 2527 | vfs_unbusy(mp, p); |
| 2528 | } |
| 2529 | lwkt_reltoken(&ilock); |
| 2530 | |
| 2531 | return (0); |
| 2532 | } |
| 2533 | #endif |
| 2534 | |
| 2535 | /* |
| 2536 | * XXX |
| 2537 | * Exporting the vnode list on large systems causes them to crash. |
| 2538 | * Exporting the vnode list on medium systems causes sysctl to coredump. |
| 2539 | */ |
| 2540 | #if 0 |
| 2541 | SYSCTL_PROC(_kern, KERN_VNODE, vnode, CTLTYPE_OPAQUE|CTLFLAG_RD, |
| 2542 | 0, 0, sysctl_vnode, "S,vnode", ""); |
| 2543 | #endif |
| 2544 | |
| 2545 | /* |
| 2546 | * Check to see if a filesystem is mounted on a block device. |
| 2547 | */ |
| 2548 | int |
| 2549 | vfs_mountedon(struct vnode *vp) |
| 2550 | { |
| 2551 | dev_t dev; |
| 2552 | |
| 2553 | if ((dev = vp->v_rdev) == NULL) |
| 2554 | dev = udev2dev(vp->v_udev, (vp->v_type == VBLK)); |
| 2555 | if (dev != NODEV && dev->si_mountpoint) |
| 2556 | return (EBUSY); |
| 2557 | return (0); |
| 2558 | } |
| 2559 | |
| 2560 | /* |
| 2561 | * Unmount all filesystems. The list is traversed in reverse order |
| 2562 | * of mounting to avoid dependencies. |
| 2563 | */ |
| 2564 | void |
| 2565 | vfs_unmountall(void) |
| 2566 | { |
| 2567 | struct mount *mp; |
| 2568 | struct thread *td = curthread; |
| 2569 | int error; |
| 2570 | |
| 2571 | if (td->td_proc == NULL) |
| 2572 | td = initproc->p_thread; /* XXX XXX use proc0 instead? */ |
| 2573 | |
| 2574 | /* |
| 2575 | * Since this only runs when rebooting, it is not interlocked. |
| 2576 | */ |
| 2577 | while(!TAILQ_EMPTY(&mountlist)) { |
| 2578 | mp = TAILQ_LAST(&mountlist, mntlist); |
| 2579 | error = dounmount(mp, MNT_FORCE, td); |
| 2580 | if (error) { |
| 2581 | TAILQ_REMOVE(&mountlist, mp, mnt_list); |
| 2582 | printf("unmount of %s failed (", |
| 2583 | mp->mnt_stat.f_mntonname); |
| 2584 | if (error == EBUSY) |
| 2585 | printf("BUSY)\n"); |
| 2586 | else |
| 2587 | printf("%d)\n", error); |
| 2588 | } else { |
| 2589 | /* The unmount has removed mp from the mountlist */ |
| 2590 | } |
| 2591 | } |
| 2592 | } |
| 2593 | |
| 2594 | /* |
| 2595 | * Build hash lists of net addresses and hang them off the mount point. |
| 2596 | * Called by ufs_mount() to set up the lists of export addresses. |
| 2597 | */ |
| 2598 | static int |
| 2599 | vfs_hang_addrlist(struct mount *mp, struct netexport *nep, |
| 2600 | struct export_args *argp) |
| 2601 | { |
| 2602 | struct netcred *np; |
| 2603 | struct radix_node_head *rnh; |
| 2604 | int i; |
| 2605 | struct radix_node *rn; |
| 2606 | struct sockaddr *saddr, *smask = 0; |
| 2607 | struct domain *dom; |
| 2608 | int error; |
| 2609 | |
| 2610 | if (argp->ex_addrlen == 0) { |
| 2611 | if (mp->mnt_flag & MNT_DEFEXPORTED) |
| 2612 | return (EPERM); |
| 2613 | np = &nep->ne_defexported; |
| 2614 | np->netc_exflags = argp->ex_flags; |
| 2615 | np->netc_anon = argp->ex_anon; |
| 2616 | np->netc_anon.cr_ref = 1; |
| 2617 | mp->mnt_flag |= MNT_DEFEXPORTED; |
| 2618 | return (0); |
| 2619 | } |
| 2620 | |
| 2621 | if (argp->ex_addrlen < 0 || argp->ex_addrlen > MLEN) |
| 2622 | return (EINVAL); |
| 2623 | if (argp->ex_masklen < 0 || argp->ex_masklen > MLEN) |
| 2624 | return (EINVAL); |
| 2625 | |
| 2626 | i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen; |
| 2627 | np = (struct netcred *) malloc(i, M_NETADDR, M_WAITOK); |
| 2628 | bzero((caddr_t) np, i); |
| 2629 | saddr = (struct sockaddr *) (np + 1); |
| 2630 | if ((error = copyin(argp->ex_addr, (caddr_t) saddr, argp->ex_addrlen))) |
| 2631 | goto out; |
| 2632 | if (saddr->sa_len > argp->ex_addrlen) |
| 2633 | saddr->sa_len = argp->ex_addrlen; |
| 2634 | if (argp->ex_masklen) { |
| 2635 | smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen); |
| 2636 | error = copyin(argp->ex_mask, (caddr_t)smask, argp->ex_masklen); |
| 2637 | if (error) |
| 2638 | goto out; |
| 2639 | if (smask->sa_len > argp->ex_masklen) |
| 2640 | smask->sa_len = argp->ex_masklen; |
| 2641 | } |
| 2642 | i = saddr->sa_family; |
| 2643 | if ((rnh = nep->ne_rtable[i]) == 0) { |
| 2644 | /* |
| 2645 | * Seems silly to initialize every AF when most are not used, |
| 2646 | * do so on demand here |
| 2647 | */ |
| 2648 | for (dom = domains; dom; dom = dom->dom_next) |
| 2649 | if (dom->dom_family == i && dom->dom_rtattach) { |
| 2650 | dom->dom_rtattach((void **) &nep->ne_rtable[i], |
| 2651 | dom->dom_rtoffset); |
| 2652 | break; |
| 2653 | } |
| 2654 | if ((rnh = nep->ne_rtable[i]) == 0) { |
| 2655 | error = ENOBUFS; |
| 2656 | goto out; |
| 2657 | } |
| 2658 | } |
| 2659 | rn = (*rnh->rnh_addaddr) ((caddr_t) saddr, (caddr_t) smask, rnh, |
| 2660 | np->netc_rnodes); |
| 2661 | if (rn == 0 || np != (struct netcred *) rn) { /* already exists */ |
| 2662 | error = EPERM; |
| 2663 | goto out; |
| 2664 | } |
| 2665 | np->netc_exflags = argp->ex_flags; |
| 2666 | np->netc_anon = argp->ex_anon; |
| 2667 | np->netc_anon.cr_ref = 1; |
| 2668 | return (0); |
| 2669 | out: |
| 2670 | free(np, M_NETADDR); |
| 2671 | return (error); |
| 2672 | } |
| 2673 | |
| 2674 | /* ARGSUSED */ |
| 2675 | static int |
| 2676 | vfs_free_netcred(struct radix_node *rn, void *w) |
| 2677 | { |
| 2678 | struct radix_node_head *rnh = (struct radix_node_head *) w; |
| 2679 | |
| 2680 | (*rnh->rnh_deladdr) (rn->rn_key, rn->rn_mask, rnh); |
| 2681 | free((caddr_t) rn, M_NETADDR); |
| 2682 | return (0); |
| 2683 | } |
| 2684 | |
| 2685 | /* |
| 2686 | * Free the net address hash lists that are hanging off the mount points. |
| 2687 | */ |
| 2688 | static void |
| 2689 | vfs_free_addrlist(struct netexport *nep) |
| 2690 | { |
| 2691 | int i; |
| 2692 | struct radix_node_head *rnh; |
| 2693 | |
| 2694 | for (i = 0; i <= AF_MAX; i++) |
| 2695 | if ((rnh = nep->ne_rtable[i])) { |
| 2696 | (*rnh->rnh_walktree) (rnh, vfs_free_netcred, |
| 2697 | (caddr_t) rnh); |
| 2698 | free((caddr_t) rnh, M_RTABLE); |
| 2699 | nep->ne_rtable[i] = 0; |
| 2700 | } |
| 2701 | } |
| 2702 | |
| 2703 | int |
| 2704 | vfs_export(struct mount *mp, struct netexport *nep, struct export_args *argp) |
| 2705 | { |
| 2706 | int error; |
| 2707 | |
| 2708 | if (argp->ex_flags & MNT_DELEXPORT) { |
| 2709 | if (mp->mnt_flag & MNT_EXPUBLIC) { |
| 2710 | vfs_setpublicfs(NULL, NULL, NULL); |
| 2711 | mp->mnt_flag &= ~MNT_EXPUBLIC; |
| 2712 | } |
| 2713 | vfs_free_addrlist(nep); |
| 2714 | mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED); |
| 2715 | } |
| 2716 | if (argp->ex_flags & MNT_EXPORTED) { |
| 2717 | if (argp->ex_flags & MNT_EXPUBLIC) { |
| 2718 | if ((error = vfs_setpublicfs(mp, nep, argp)) != 0) |
| 2719 | return (error); |
| 2720 | mp->mnt_flag |= MNT_EXPUBLIC; |
| 2721 | } |
| 2722 | if ((error = vfs_hang_addrlist(mp, nep, argp))) |
| 2723 | return (error); |
| 2724 | mp->mnt_flag |= MNT_EXPORTED; |
| 2725 | } |
| 2726 | return (0); |
| 2727 | } |
| 2728 | |
| 2729 | |
| 2730 | /* |
| 2731 | * Set the publicly exported filesystem (WebNFS). Currently, only |
| 2732 | * one public filesystem is possible in the spec (RFC 2054 and 2055) |
| 2733 | */ |
| 2734 | int |
| 2735 | vfs_setpublicfs(struct mount *mp, struct netexport *nep, |
| 2736 | struct export_args *argp) |
| 2737 | { |
| 2738 | int error; |
| 2739 | struct vnode *rvp; |
| 2740 | char *cp; |
| 2741 | |
| 2742 | /* |
| 2743 | * mp == NULL -> invalidate the current info, the FS is |
| 2744 | * no longer exported. May be called from either vfs_export |
| 2745 | * or unmount, so check if it hasn't already been done. |
| 2746 | */ |
| 2747 | if (mp == NULL) { |
| 2748 | if (nfs_pub.np_valid) { |
| 2749 | nfs_pub.np_valid = 0; |
| 2750 | if (nfs_pub.np_index != NULL) { |
| 2751 | FREE(nfs_pub.np_index, M_TEMP); |
| 2752 | nfs_pub.np_index = NULL; |
| 2753 | } |
| 2754 | } |
| 2755 | return (0); |
| 2756 | } |
| 2757 | |
| 2758 | /* |
| 2759 | * Only one allowed at a time. |
| 2760 | */ |
| 2761 | if (nfs_pub.np_valid != 0 && mp != nfs_pub.np_mount) |
| 2762 | return (EBUSY); |
| 2763 | |
| 2764 | /* |
| 2765 | * Get real filehandle for root of exported FS. |
| 2766 | */ |
| 2767 | bzero((caddr_t)&nfs_pub.np_handle, sizeof(nfs_pub.np_handle)); |
| 2768 | nfs_pub.np_handle.fh_fsid = mp->mnt_stat.f_fsid; |
| 2769 | |
| 2770 | if ((error = VFS_ROOT(mp, &rvp))) |
| 2771 | return (error); |
| 2772 | |
| 2773 | if ((error = VFS_VPTOFH(rvp, &nfs_pub.np_handle.fh_fid))) |
| 2774 | return (error); |
| 2775 | |
| 2776 | vput(rvp); |
| 2777 | |
| 2778 | /* |
| 2779 | * If an indexfile was specified, pull it in. |
| 2780 | */ |
| 2781 | if (argp->ex_indexfile != NULL) { |
| 2782 | MALLOC(nfs_pub.np_index, char *, MAXNAMLEN + 1, M_TEMP, |
| 2783 | M_WAITOK); |
| 2784 | error = copyinstr(argp->ex_indexfile, nfs_pub.np_index, |
| 2785 | MAXNAMLEN, (size_t *)0); |
| 2786 | if (!error) { |
| 2787 | /* |
| 2788 | * Check for illegal filenames. |
| 2789 | */ |
| 2790 | for (cp = nfs_pub.np_index; *cp; cp++) { |
| 2791 | if (*cp == '/') { |
| 2792 | error = EINVAL; |
| 2793 | break; |
| 2794 | } |
| 2795 | } |
| 2796 | } |
| 2797 | if (error) { |
| 2798 | FREE(nfs_pub.np_index, M_TEMP); |
| 2799 | return (error); |
| 2800 | } |
| 2801 | } |
| 2802 | |
| 2803 | nfs_pub.np_mount = mp; |
| 2804 | nfs_pub.np_valid = 1; |
| 2805 | return (0); |
| 2806 | } |
| 2807 | |
| 2808 | struct netcred * |
| 2809 | vfs_export_lookup(struct mount *mp, struct netexport *nep, |
| 2810 | struct sockaddr *nam) |
| 2811 | { |
| 2812 | struct netcred *np; |
| 2813 | struct radix_node_head *rnh; |
| 2814 | struct sockaddr *saddr; |
| 2815 | |
| 2816 | np = NULL; |
| 2817 | if (mp->mnt_flag & MNT_EXPORTED) { |
| 2818 | /* |
| 2819 | * Lookup in the export list first. |
| 2820 | */ |
| 2821 | if (nam != NULL) { |
| 2822 | saddr = nam; |
| 2823 | rnh = nep->ne_rtable[saddr->sa_family]; |
| 2824 | if (rnh != NULL) { |
| 2825 | np = (struct netcred *) |
| 2826 | (*rnh->rnh_matchaddr)((caddr_t)saddr, |
| 2827 | rnh); |
| 2828 | if (np && np->netc_rnodes->rn_flags & RNF_ROOT) |
| 2829 | np = NULL; |
| 2830 | } |
| 2831 | } |
| 2832 | /* |
| 2833 | * If no address match, use the default if it exists. |
| 2834 | */ |
| 2835 | if (np == NULL && mp->mnt_flag & MNT_DEFEXPORTED) |
| 2836 | np = &nep->ne_defexported; |
| 2837 | } |
| 2838 | return (np); |
| 2839 | } |
| 2840 | |
| 2841 | /* |
| 2842 | * perform msync on all vnodes under a mount point. The mount point must |
| 2843 | * be locked. This code is also responsible for lazy-freeing unreferenced |
| 2844 | * vnodes whos VM objects no longer contain pages. |
| 2845 | * |
| 2846 | * NOTE: MNT_WAIT still skips vnodes in the VXLOCK state. |
| 2847 | */ |
| 2848 | static int vfs_msync_scan1(struct mount *mp, struct vnode *vp, void *data); |
| 2849 | static int vfs_msync_scan2(struct mount *mp, struct vnode *vp, |
| 2850 | lwkt_tokref_t vlock, void *data); |
| 2851 | |
| 2852 | void |
| 2853 | vfs_msync(struct mount *mp, int flags) |
| 2854 | { |
| 2855 | vmntvnodescan(mp, vfs_msync_scan1, vfs_msync_scan2, (void *)flags); |
| 2856 | } |
| 2857 | |
| 2858 | /* |
| 2859 | * scan1 is a fast pre-check. There could be hundreds of thousands of |
| 2860 | * vnodes, we cannot afford to do anything heavy weight until we have a |
| 2861 | * fairly good indication that there is work to do. |
| 2862 | */ |
| 2863 | static |
| 2864 | int |
| 2865 | vfs_msync_scan1(struct mount *mp, struct vnode *vp, void *data) |
| 2866 | { |
| 2867 | int flags = (int)data; |
| 2868 | |
| 2869 | if ((vp->v_flag & VXLOCK) == 0) { |
| 2870 | if (VSHOULDFREE(vp)) |
| 2871 | return(0); |
| 2872 | if ((mp->mnt_flag & MNT_RDONLY) == 0 && |
| 2873 | (vp->v_flag & VOBJDIRTY) && |
| 2874 | (flags == MNT_WAIT || VOP_ISLOCKED(vp, NULL) == 0)) { |
| 2875 | return(0); |
| 2876 | } |
| 2877 | } |
| 2878 | return(-1); |
| 2879 | } |
| 2880 | |
| 2881 | static |
| 2882 | int |
| 2883 | vfs_msync_scan2(struct mount *mp, struct vnode *vp, |
| 2884 | lwkt_tokref_t vlock, void *data) |
| 2885 | { |
| 2886 | vm_object_t obj; |
| 2887 | int error; |
| 2888 | int flags = (int)data; |
| 2889 | |
| 2890 | if (vp->v_flag & VXLOCK) |
| 2891 | return(0); |
| 2892 | |
| 2893 | if ((mp->mnt_flag & MNT_RDONLY) == 0 && |
| 2894 | (vp->v_flag & VOBJDIRTY) && |
| 2895 | (flags == MNT_WAIT || VOP_ISLOCKED(vp, NULL) == 0)) { |
| 2896 | error = vget(vp, vlock, LK_EXCLUSIVE | LK_RETRY | LK_NOOBJ | LK_INTERLOCK, curthread); |
| 2897 | if (error == 0) { |
| 2898 | if (VOP_GETVOBJECT(vp, &obj) == 0) { |
| 2899 | vm_object_page_clean(obj, 0, 0, |
| 2900 | flags == MNT_WAIT ? OBJPC_SYNC : OBJPC_NOSYNC); |
| 2901 | } |
| 2902 | vput(vp); |
| 2903 | } |
| 2904 | return(0); |
| 2905 | } |
| 2906 | vmaybefree(vp); |
| 2907 | lwkt_reltoken(vlock); |
| 2908 | return(0); |
| 2909 | } |
| 2910 | |
| 2911 | /* |
| 2912 | * Create the VM object needed for VMIO and mmap support. This |
| 2913 | * is done for all VREG files in the system. Some filesystems might |
| 2914 | * afford the additional metadata buffering capability of the |
| 2915 | * VMIO code by making the device node be VMIO mode also. |
| 2916 | * |
| 2917 | * vp must be locked when vfs_object_create is called. |
| 2918 | */ |
| 2919 | int |
| 2920 | vfs_object_create(struct vnode *vp, struct thread *td) |
| 2921 | { |
| 2922 | return (VOP_CREATEVOBJECT(vp, td)); |
| 2923 | } |
| 2924 | |
| 2925 | /* |
| 2926 | * NOTE: the vnode interlock must be held during the call. We have to recheck |
| 2927 | * the VFREE flag since the vnode may have been removed from the free list |
| 2928 | * while we were blocked on vnode_free_list_token. The use or hold count |
| 2929 | * must have already been bumped by the caller. |
| 2930 | */ |
| 2931 | static void |
| 2932 | vbusy(struct vnode *vp) |
| 2933 | { |
| 2934 | lwkt_tokref ilock; |
| 2935 | |
| 2936 | lwkt_gettoken(&ilock, &vnode_free_list_token); |
| 2937 | if ((vp->v_flag & VFREE) != 0) { |
| 2938 | TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); |
| 2939 | freevnodes--; |
| 2940 | vp->v_flag &= ~(VFREE|VAGE); |
| 2941 | } |
| 2942 | lwkt_reltoken(&ilock); |
| 2943 | } |
| 2944 | |
| 2945 | /* |
| 2946 | * NOTE: the vnode interlock must be held during the call. The use or hold |
| 2947 | * count must have already been bumped by the caller. We use a VINFREE to |
| 2948 | * interlock against other calls to vfree() which might occur while we |
| 2949 | * are blocked. The vnode cannot be reused until it has actually been |
| 2950 | * placed on the free list, so there are no other races even though the |
| 2951 | * use and hold counts are 0. |
| 2952 | */ |
| 2953 | static void |
| 2954 | vfree(struct vnode *vp) |
| 2955 | { |
| 2956 | lwkt_tokref ilock; |
| 2957 | |
| 2958 | if ((vp->v_flag & VINFREE) == 0) { |
| 2959 | vp->v_flag |= VINFREE; |
| 2960 | lwkt_gettoken(&ilock, &vnode_free_list_token); /* can block */ |
| 2961 | KASSERT((vp->v_flag & VFREE) == 0, ("vnode already free")); |
| 2962 | if (vp->v_flag & VAGE) { |
| 2963 | TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist); |
| 2964 | } else { |
| 2965 | TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist); |
| 2966 | } |
| 2967 | freevnodes++; |
| 2968 | vp->v_flag &= ~(VAGE|VINFREE); |
| 2969 | vp->v_flag |= VFREE; |
| 2970 | lwkt_reltoken(&ilock); /* can block */ |
| 2971 | } |
| 2972 | } |
| 2973 | |
| 2974 | |
| 2975 | /* |
| 2976 | * Record a process's interest in events which might happen to |
| 2977 | * a vnode. Because poll uses the historic select-style interface |
| 2978 | * internally, this routine serves as both the ``check for any |
| 2979 | * pending events'' and the ``record my interest in future events'' |
| 2980 | * functions. (These are done together, while the lock is held, |
| 2981 | * to avoid race conditions.) |
| 2982 | */ |
| 2983 | int |
| 2984 | vn_pollrecord(struct vnode *vp, struct thread *td, int events) |
| 2985 | { |
| 2986 | lwkt_tokref ilock; |
| 2987 | |
| 2988 | lwkt_gettoken(&ilock, &vp->v_pollinfo.vpi_token); |
| 2989 | if (vp->v_pollinfo.vpi_revents & events) { |
| 2990 | /* |
| 2991 | * This leaves events we are not interested |
| 2992 | * in available for the other process which |
| 2993 | * which presumably had requested them |
| 2994 | * (otherwise they would never have been |
| 2995 | * recorded). |
| 2996 | */ |
| 2997 | events &= vp->v_pollinfo.vpi_revents; |
| 2998 | vp->v_pollinfo.vpi_revents &= ~events; |
| 2999 | |
| 3000 | lwkt_reltoken(&ilock); |
| 3001 | return events; |
| 3002 | } |
| 3003 | vp->v_pollinfo.vpi_events |= events; |
| 3004 | selrecord(td, &vp->v_pollinfo.vpi_selinfo); |
| 3005 | lwkt_reltoken(&ilock); |
| 3006 | return 0; |
| 3007 | } |
| 3008 | |
| 3009 | /* |
| 3010 | * Note the occurrence of an event. If the VN_POLLEVENT macro is used, |
| 3011 | * it is possible for us to miss an event due to race conditions, but |
| 3012 | * that condition is expected to be rare, so for the moment it is the |
| 3013 | * preferred interface. |
| 3014 | */ |
| 3015 | void |
| 3016 | vn_pollevent(struct vnode *vp, int events) |
| 3017 | { |
| 3018 | lwkt_tokref ilock; |
| 3019 | |
| 3020 | lwkt_gettoken(&ilock, &vp->v_pollinfo.vpi_token); |
| 3021 | if (vp->v_pollinfo.vpi_events & events) { |
| 3022 | /* |
| 3023 | * We clear vpi_events so that we don't |
| 3024 | * call selwakeup() twice if two events are |
| 3025 | * posted before the polling process(es) is |
| 3026 | * awakened. This also ensures that we take at |
| 3027 | * most one selwakeup() if the polling process |
| 3028 | * is no longer interested. However, it does |
| 3029 | * mean that only one event can be noticed at |
| 3030 | * a time. (Perhaps we should only clear those |
| 3031 | * event bits which we note?) XXX |
| 3032 | */ |
| 3033 | vp->v_pollinfo.vpi_events = 0; /* &= ~events ??? */ |
| 3034 | vp->v_pollinfo.vpi_revents |= events; |
| 3035 | selwakeup(&vp->v_pollinfo.vpi_selinfo); |
| 3036 | } |
| 3037 | lwkt_reltoken(&ilock); |
| 3038 | } |
| 3039 | |
| 3040 | /* |
| 3041 | * Wake up anyone polling on vp because it is being revoked. |
| 3042 | * This depends on dead_poll() returning POLLHUP for correct |
| 3043 | * behavior. |
| 3044 | */ |
| 3045 | void |
| 3046 | vn_pollgone(struct vnode *vp) |
| 3047 | { |
| 3048 | lwkt_tokref ilock; |
| 3049 | |
| 3050 | lwkt_gettoken(&ilock, &vp->v_pollinfo.vpi_token); |
| 3051 | if (vp->v_pollinfo.vpi_events) { |
| 3052 | vp->v_pollinfo.vpi_events = 0; |
| 3053 | selwakeup(&vp->v_pollinfo.vpi_selinfo); |
| 3054 | } |
| 3055 | lwkt_reltoken(&ilock); |
| 3056 | } |
| 3057 | |
| 3058 | |
| 3059 | |
| 3060 | /* |
| 3061 | * Routine to create and manage a filesystem syncer vnode. |
| 3062 | */ |
| 3063 | #define sync_close ((int (*) (struct vop_close_args *))nullop) |
| 3064 | static int sync_fsync (struct vop_fsync_args *); |
| 3065 | static int sync_inactive (struct vop_inactive_args *); |
| 3066 | static int sync_reclaim (struct vop_reclaim_args *); |
| 3067 | #define sync_lock ((int (*) (struct vop_lock_args *))vop_nolock) |
| 3068 | #define sync_unlock ((int (*) (struct vop_unlock_args *))vop_nounlock) |
| 3069 | static int sync_print (struct vop_print_args *); |
| 3070 | #define sync_islocked ((int(*) (struct vop_islocked_args *))vop_noislocked) |
| 3071 | |
| 3072 | static vop_t **sync_vnodeop_p; |
| 3073 | static struct vnodeopv_entry_desc sync_vnodeop_entries[] = { |
| 3074 | { &vop_default_desc, (vop_t *) vop_eopnotsupp }, |
| 3075 | { &vop_close_desc, (vop_t *) sync_close }, /* close */ |
| 3076 | { &vop_fsync_desc, (vop_t *) sync_fsync }, /* fsync */ |
| 3077 | { &vop_inactive_desc, (vop_t *) sync_inactive }, /* inactive */ |
| 3078 | { &vop_reclaim_desc, (vop_t *) sync_reclaim }, /* reclaim */ |
| 3079 | { &vop_lock_desc, (vop_t *) sync_lock }, /* lock */ |
| 3080 | { &vop_unlock_desc, (vop_t *) sync_unlock }, /* unlock */ |
| 3081 | { &vop_print_desc, (vop_t *) sync_print }, /* print */ |
| 3082 | { &vop_islocked_desc, (vop_t *) sync_islocked }, /* islocked */ |
| 3083 | { NULL, NULL } |
| 3084 | }; |
| 3085 | static struct vnodeopv_desc sync_vnodeop_opv_desc = |
| 3086 | { &sync_vnodeop_p, sync_vnodeop_entries }; |
| 3087 | |
| 3088 | VNODEOP_SET(sync_vnodeop_opv_desc); |
| 3089 | |
| 3090 | /* |
| 3091 | * Create a new filesystem syncer vnode for the specified mount point. |
| 3092 | * This vnode is placed on the worklist and is responsible for sync'ing |
| 3093 | * the filesystem. |
| 3094 | * |
| 3095 | * NOTE: read-only mounts are also placed on the worklist. The filesystem |
| 3096 | * sync code is also responsible for cleaning up vnodes. |
| 3097 | */ |
| 3098 | int |
| 3099 | vfs_allocate_syncvnode(struct mount *mp) |
| 3100 | { |
| 3101 | struct vnode *vp; |
| 3102 | static long start, incr, next; |
| 3103 | int error; |
| 3104 | |
| 3105 | /* Allocate a new vnode */ |
| 3106 | if ((error = getnewvnode(VT_VFS, mp, sync_vnodeop_p, &vp)) != 0) { |
| 3107 | mp->mnt_syncer = NULL; |
| 3108 | return (error); |
| 3109 | } |
| 3110 | vp->v_type = VNON; |
| 3111 | /* |
| 3112 | * Place the vnode onto the syncer worklist. We attempt to |
| 3113 | * scatter them about on the list so that they will go off |
| 3114 | * at evenly distributed times even if all the filesystems |
| 3115 | * are mounted at once. |
| 3116 | */ |
| 3117 | next += incr; |
| 3118 | if (next == 0 || next > syncer_maxdelay) { |
| 3119 | start /= 2; |
| 3120 | incr /= 2; |
| 3121 | if (start == 0) { |
| 3122 | start = syncer_maxdelay / 2; |
| 3123 | incr = syncer_maxdelay; |
| 3124 | } |
| 3125 | next = start; |
| 3126 | } |
| 3127 | vn_syncer_add_to_worklist(vp, syncdelay > 0 ? next % syncdelay : 0); |
| 3128 | mp->mnt_syncer = vp; |
| 3129 | return (0); |
| 3130 | } |
| 3131 | |
| 3132 | /* |
| 3133 | * Do a lazy sync of the filesystem. |
| 3134 | * |
| 3135 | * sync_fsync { struct vnode *a_vp, struct ucred *a_cred, int a_waitfor, |
| 3136 | * struct thread *a_td } |
| 3137 | */ |
| 3138 | static int |
| 3139 | sync_fsync(struct vop_fsync_args *ap) |
| 3140 | { |
| 3141 | struct vnode *syncvp = ap->a_vp; |
| 3142 | struct mount *mp = syncvp->v_mount; |
| 3143 | struct thread *td = ap->a_td; |
| 3144 | lwkt_tokref ilock; |
| 3145 | int asyncflag; |
| 3146 | |
| 3147 | /* |
| 3148 | * We only need to do something if this is a lazy evaluation. |
| 3149 | */ |
| 3150 | if (ap->a_waitfor != MNT_LAZY) |
| 3151 | return (0); |
| 3152 | |
| 3153 | /* |
| 3154 | * Move ourselves to the back of the sync list. |
| 3155 | */ |
| 3156 | vn_syncer_add_to_worklist(syncvp, syncdelay); |
| 3157 | |
| 3158 | /* |
| 3159 | * Walk the list of vnodes pushing all that are dirty and |
| 3160 | * not already on the sync list, and freeing vnodes which have |
| 3161 | * no refs and whos VM objects are empty. vfs_msync() handles |
| 3162 | * the VM issues and must be called whether the mount is readonly |
| 3163 | * or not. |
| 3164 | */ |
| 3165 | lwkt_gettoken(&ilock, &mountlist_token); |
| 3166 | if (vfs_busy(mp, LK_EXCLUSIVE | LK_NOWAIT, &ilock, td) != 0) { |
| 3167 | lwkt_reltoken(&ilock); |
| 3168 | return (0); |
| 3169 | } |
| 3170 | if (mp->mnt_flag & MNT_RDONLY) { |
| 3171 | vfs_msync(mp, MNT_NOWAIT); |
| 3172 | } else { |
| 3173 | asyncflag = mp->mnt_flag & MNT_ASYNC; |
| 3174 | mp->mnt_flag &= ~MNT_ASYNC; /* ZZZ hack */ |
| 3175 | vfs_msync(mp, MNT_NOWAIT); |
| 3176 | VFS_SYNC(mp, MNT_LAZY, td); |
| 3177 | if (asyncflag) |
| 3178 | mp->mnt_flag |= MNT_ASYNC; |
| 3179 | } |
| 3180 | vfs_unbusy(mp, td); |
| 3181 | return (0); |
| 3182 | } |
| 3183 | |
| 3184 | /* |
| 3185 | * The syncer vnode is no referenced. |
| 3186 | * |
| 3187 | * sync_inactive { struct vnode *a_vp, struct proc *a_p } |
| 3188 | */ |
| 3189 | static int |
| 3190 | sync_inactive(struct vop_inactive_args *ap) |
| 3191 | { |
| 3192 | vgone(ap->a_vp); |
| 3193 | return (0); |
| 3194 | } |
| 3195 | |
| 3196 | /* |
| 3197 | * The syncer vnode is no longer needed and is being decommissioned. |
| 3198 | * |
| 3199 | * Modifications to the worklist must be protected at splbio(). |
| 3200 | * |
| 3201 | * sync_reclaim { struct vnode *a_vp } |
| 3202 | */ |
| 3203 | static int |
| 3204 | sync_reclaim(struct vop_reclaim_args *ap) |
| 3205 | { |
| 3206 | struct vnode *vp = ap->a_vp; |
| 3207 | int s; |
| 3208 | |
| 3209 | s = splbio(); |
| 3210 | vp->v_mount->mnt_syncer = NULL; |
| 3211 | if (vp->v_flag & VONWORKLST) { |
| 3212 | LIST_REMOVE(vp, v_synclist); |
| 3213 | vp->v_flag &= ~VONWORKLST; |
| 3214 | } |
| 3215 | splx(s); |
| 3216 | |
| 3217 | return (0); |
| 3218 | } |
| 3219 | |
| 3220 | /* |
| 3221 | * Print out a syncer vnode. |
| 3222 | * |
| 3223 | * sync_print { struct vnode *a_vp } |
| 3224 | */ |
| 3225 | static int |
| 3226 | sync_print(struct vop_print_args *ap) |
| 3227 | { |
| 3228 | struct vnode *vp = ap->a_vp; |
| 3229 | |
| 3230 | printf("syncer vnode"); |
| 3231 | if (vp->v_vnlock != NULL) |
| 3232 | lockmgr_printinfo(vp->v_vnlock); |
| 3233 | printf("\n"); |
| 3234 | return (0); |
| 3235 | } |
| 3236 | |
| 3237 | /* |
| 3238 | * extract the dev_t from a VBLK or VCHR. The vnode must have been opened |
| 3239 | * (or v_rdev might be NULL). |
| 3240 | */ |
| 3241 | dev_t |
| 3242 | vn_todev(struct vnode *vp) |
| 3243 | { |
| 3244 | if (vp->v_type != VBLK && vp->v_type != VCHR) |
| 3245 | return (NODEV); |
| 3246 | KKASSERT(vp->v_rdev != NULL); |
| 3247 | return (vp->v_rdev); |
| 3248 | } |
| 3249 | |
| 3250 | /* |
| 3251 | * Check if vnode represents a disk device. The vnode does not need to be |
| 3252 | * opened. |
| 3253 | */ |
| 3254 | int |
| 3255 | vn_isdisk(struct vnode *vp, int *errp) |
| 3256 | { |
| 3257 | dev_t dev; |
| 3258 | |
| 3259 | if (vp->v_type != VBLK && vp->v_type != VCHR) { |
| 3260 | if (errp != NULL) |
| 3261 | *errp = ENOTBLK; |
| 3262 | return (0); |
| 3263 | } |
| 3264 | |
| 3265 | if ((dev = vp->v_rdev) == NULL) |
| 3266 | dev = udev2dev(vp->v_udev, (vp->v_type == VBLK)); |
| 3267 | if (dev == NULL || dev == NODEV) { |
| 3268 | if (errp != NULL) |
| 3269 | *errp = ENXIO; |
| 3270 | return (0); |
| 3271 | } |
| 3272 | if (dev_is_good(dev) == 0) { |
| 3273 | if (errp != NULL) |
| 3274 | *errp = ENXIO; |
| 3275 | return (0); |
| 3276 | } |
| 3277 | if ((dev_dflags(dev) & D_DISK) == 0) { |
| 3278 | if (errp != NULL) |
| 3279 | *errp = ENOTBLK; |
| 3280 | return (0); |
| 3281 | } |
| 3282 | if (errp != NULL) |
| 3283 | *errp = 0; |
| 3284 | return (1); |
| 3285 | } |
| 3286 | |
| 3287 | void |
| 3288 | NDFREE(struct nameidata *ndp, const uint flags) |
| 3289 | { |
| 3290 | if (!(flags & NDF_NO_FREE_PNBUF) && |
| 3291 | (ndp->ni_cnd.cn_flags & CNP_HASBUF)) { |
| 3292 | zfree(namei_zone, ndp->ni_cnd.cn_pnbuf); |
| 3293 | ndp->ni_cnd.cn_flags &= ~CNP_HASBUF; |
| 3294 | } |
| 3295 | if (!(flags & NDF_NO_DNCP_RELE) && |
| 3296 | (ndp->ni_cnd.cn_flags & CNP_WANTDNCP) && |
| 3297 | ndp->ni_dncp) { |
| 3298 | cache_drop(ndp->ni_dncp); |
| 3299 | ndp->ni_dncp = NULL; |
| 3300 | } |
| 3301 | if (!(flags & NDF_NO_NCP_RELE) && |
| 3302 | (ndp->ni_cnd.cn_flags & CNP_WANTNCP) && |
| 3303 | ndp->ni_ncp) { |
| 3304 | cache_drop(ndp->ni_ncp); |
| 3305 | ndp->ni_ncp = NULL; |
| 3306 | } |
| 3307 | if (!(flags & NDF_NO_DVP_UNLOCK) && |
| 3308 | (ndp->ni_cnd.cn_flags & CNP_LOCKPARENT) && |
| 3309 | ndp->ni_dvp != ndp->ni_vp) { |
| 3310 | VOP_UNLOCK(ndp->ni_dvp, NULL, 0, ndp->ni_cnd.cn_td); |
| 3311 | } |
| 3312 | if (!(flags & NDF_NO_DVP_RELE) && |
| 3313 | (ndp->ni_cnd.cn_flags & (CNP_LOCKPARENT|CNP_WANTPARENT))) { |
| 3314 | vrele(ndp->ni_dvp); |
| 3315 | ndp->ni_dvp = NULL; |
| 3316 | } |
| 3317 | if (!(flags & NDF_NO_VP_UNLOCK) && |
| 3318 | (ndp->ni_cnd.cn_flags & CNP_LOCKLEAF) && ndp->ni_vp) { |
| 3319 | VOP_UNLOCK(ndp->ni_vp, NULL, 0, ndp->ni_cnd.cn_td); |
| 3320 | } |
| 3321 | if (!(flags & NDF_NO_VP_RELE) && |
| 3322 | ndp->ni_vp) { |
| 3323 | vrele(ndp->ni_vp); |
| 3324 | ndp->ni_vp = NULL; |
| 3325 | } |
| 3326 | if (!(flags & NDF_NO_STARTDIR_RELE) && |
| 3327 | (ndp->ni_cnd.cn_flags & CNP_SAVESTART)) { |
| 3328 | vrele(ndp->ni_startdir); |
| 3329 | ndp->ni_startdir = NULL; |
| 3330 | } |
| 3331 | } |
| 3332 | |
| 3333 | #ifdef DEBUG_VFS_LOCKS |
| 3334 | |
| 3335 | void |
| 3336 | assert_vop_locked(struct vnode *vp, const char *str) |
| 3337 | { |
| 3338 | if (vp && IS_LOCKING_VFS(vp) && !VOP_ISLOCKED(vp, NULL)) { |
| 3339 | panic("%s: %p is not locked shared but should be", str, vp); |
| 3340 | } |
| 3341 | } |
| 3342 | |
| 3343 | void |
| 3344 | assert_vop_unlocked(struct vnode *vp, const char *str) |
| 3345 | { |
| 3346 | if (vp && IS_LOCKING_VFS(vp)) { |
| 3347 | if (VOP_ISLOCKED(vp, curthread) == LK_EXCLUSIVE) { |
| 3348 | panic("%s: %p is locked but should not be", str, vp); |
| 3349 | } |
| 3350 | } |
| 3351 | } |
| 3352 | |
| 3353 | #endif |