/* $OpenBSD: vfs_subr.c,v 1.325 2024/10/31 10:06:51 mvs Exp $ */ /* $NetBSD: vfs_subr.c,v 1.53 1996/04/22 01:39:13 christos Exp $ */ /* * Copyright (c) 1989, 1993 * The Regents of the University of California. All rights reserved. * (c) UNIX System Laboratories, Inc. * All or some portions of this file are derived from material licensed * to the University of California by American Telephone and Telegraph * Co. or Unix System Laboratories, Inc. and are reproduced herein with * the permission of UNIX System Laboratories, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)vfs_subr.c 8.13 (Berkeley) 4/18/94 */ /* * External virtual filesystem routines */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "softraid.h" /* * Locks used to protect data: * a atomic */ void sr_quiesce(void); enum vtype iftovt_tab[16] = { VNON, VFIFO, VCHR, VNON, VDIR, VNON, VBLK, VNON, VREG, VNON, VLNK, VNON, VSOCK, VNON, VNON, VBAD, }; int vttoif_tab[9] = { 0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK, S_IFSOCK, S_IFIFO, S_IFMT, }; int prtactive = 0; /* 1 => print out reclaim of active vnodes */ int suid_clear = 1; /* [a] 1 => clear SUID / SGID on owner change */ /* * Insq/Remq for the vnode usage lists. */ #define bufinsvn(bp, dp) LIST_INSERT_HEAD(dp, bp, b_vnbufs) #define bufremvn(bp) { \ LIST_REMOVE(bp, b_vnbufs); \ LIST_NEXT(bp, b_vnbufs) = NOLIST; \ } TAILQ_HEAD(freelst, vnode); struct freelst vnode_hold_list; /* list of vnodes referencing buffers */ struct freelst vnode_free_list; /* vnode free list */ struct mntlist mountlist; /* mounted filesystem list */ void vclean(struct vnode *, int, struct proc *); void insmntque(struct vnode *, struct mount *); int getdevvp(dev_t, struct vnode **, enum vtype); int vfs_hang_addrlist(struct mount *, struct netexport *, struct export_args *); int vfs_free_netcred(struct radix_node *, void *, u_int); void vfs_free_addrlist(struct netexport *); void vputonfreelist(struct vnode *); int vflush_vnode(struct vnode *, void *); int maxvnodes; struct mutex vnode_mtx = MUTEX_INITIALIZER(IPL_BIO); void vfs_unmountall(void); #ifdef DEBUG void printlockedvnodes(void); #endif struct pool vnode_pool; struct pool uvm_vnode_pool; static inline int rb_buf_compare(const struct buf *b1, const struct buf *b2); RBT_GENERATE(buf_rb_bufs, buf, b_rbbufs, rb_buf_compare); static inline int rb_buf_compare(const struct buf *b1, const struct buf *b2) { if (b1->b_lblkno < b2->b_lblkno) return(-1); if (b1->b_lblkno > b2->b_lblkno) return(1); return(0); } /* * Initialize the vnode management data structures. */ void vntblinit(void) { /* buffer cache may need a vnode for each buffer */ maxvnodes = 2 * initialvnodes; pool_init(&vnode_pool, sizeof(struct vnode), 0, IPL_NONE, PR_WAITOK, "vnodes", NULL); pool_init(&uvm_vnode_pool, sizeof(struct uvm_vnode), 0, IPL_NONE, PR_WAITOK, "uvmvnodes", NULL); TAILQ_INIT(&vnode_hold_list); TAILQ_INIT(&vnode_free_list); TAILQ_INIT(&mountlist); /* * Initialize the filesystem syncer. */ vn_initialize_syncerd(); #ifdef NFSSERVER rn_init(sizeof(struct sockaddr_in)); #endif /* NFSSERVER */ } /* * Allocate a mount point. * * The returned mount point is marked as busy. */ struct mount * vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp) { struct mount *mp; mp = malloc(sizeof(*mp), M_MOUNT, M_WAITOK|M_ZERO); rw_init_flags(&mp->mnt_lock, "vfslock", RWL_IS_VNODE); (void)vfs_busy(mp, VB_READ|VB_NOWAIT); TAILQ_INIT(&mp->mnt_vnodelist); mp->mnt_vnodecovered = vp; atomic_inc_int(&vfsp->vfc_refcount); mp->mnt_vfc = vfsp; mp->mnt_op = vfsp->vfc_vfsops; mp->mnt_flag = vfsp->vfc_flags; strncpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); return (mp); } /* * Release a mount point. */ void vfs_mount_free(struct mount *mp) { atomic_dec_int(&mp->mnt_vfc->vfc_refcount); free(mp, M_MOUNT, sizeof(*mp)); } /* * Mark a mount point as busy. Used to synchronize access and to delay * unmounting. * * Default behaviour is to attempt getting a READ lock and in case of an * ongoing unmount, to wait for it to finish and then return failure. */ int vfs_busy(struct mount *mp, int flags) { int rwflags = 0; if (flags & VB_WRITE) rwflags |= RW_WRITE; else rwflags |= RW_READ; if (flags & VB_WAIT) rwflags |= RW_SLEEPFAIL; else rwflags |= RW_NOSLEEP; #ifdef WITNESS if (flags & VB_DUPOK) rwflags |= RW_DUPOK; #endif if (rw_enter(&mp->mnt_lock, rwflags)) return (EBUSY); return (0); } /* * Free a busy file system */ void vfs_unbusy(struct mount *mp) { rw_exit(&mp->mnt_lock); } int vfs_isbusy(struct mount *mp) { return (rw_status(&mp->mnt_lock) != 0); } /* * Lookup a filesystem type, and if found allocate and initialize * a mount structure for it. * * Devname is usually updated by mount(8) after booting. */ int vfs_rootmountalloc(char *fstypename, char *devname, struct mount **mpp) { struct vfsconf *vfsp; struct mount *mp; vfsp = vfs_byname(fstypename); if (vfsp == NULL) return (ENODEV); mp = vfs_mount_alloc(NULLVP, vfsp); mp->mnt_flag |= MNT_RDONLY; mp->mnt_stat.f_mntonname[0] = '/'; strlcpy(mp->mnt_stat.f_mntfromname, devname, MNAMELEN); strlcpy(mp->mnt_stat.f_mntfromspec, devname, MNAMELEN); *mpp = mp; return (0); } /* * Lookup a mount point by filesystem identifier. */ struct mount * vfs_getvfs(fsid_t *fsid) { struct mount *mp; TAILQ_FOREACH(mp, &mountlist, mnt_list) { if (mp->mnt_stat.f_fsid.val[0] == fsid->val[0] && mp->mnt_stat.f_fsid.val[1] == fsid->val[1]) { return (mp); } } return (NULL); } /* * Get a new unique fsid */ void vfs_getnewfsid(struct mount *mp) { static u_short xxxfs_mntid; fsid_t tfsid; int mtype; mtype = mp->mnt_vfc->vfc_typenum; mp->mnt_stat.f_fsid.val[0] = makedev(nblkdev + mtype, 0); mp->mnt_stat.f_fsid.val[1] = mtype; if (xxxfs_mntid == 0) ++xxxfs_mntid; tfsid.val[0] = makedev(nblkdev + mtype, xxxfs_mntid); tfsid.val[1] = mtype; if (!TAILQ_EMPTY(&mountlist)) { while (vfs_getvfs(&tfsid)) { tfsid.val[0]++; xxxfs_mntid++; } } mp->mnt_stat.f_fsid.val[0] = tfsid.val[0]; } /* * Set vnode attributes to VNOVAL */ void vattr_null(struct vattr *vap) { vap->va_type = VNON; /* * Don't get fancy: u_quad_t = u_int = VNOVAL leaves the u_quad_t * with 2^31-1 instead of 2^64-1. Just write'm out and let * the compiler do its job. */ vap->va_mode = VNOVAL; vap->va_nlink = VNOVAL; vap->va_uid = VNOVAL; vap->va_gid = VNOVAL; vap->va_fsid = VNOVAL; vap->va_fileid = VNOVAL; vap->va_size = VNOVAL; vap->va_blocksize = VNOVAL; vap->va_atime.tv_sec = VNOVAL; vap->va_atime.tv_nsec = VNOVAL; vap->va_mtime.tv_sec = VNOVAL; vap->va_mtime.tv_nsec = VNOVAL; vap->va_ctime.tv_sec = VNOVAL; vap->va_ctime.tv_nsec = VNOVAL; vap->va_gen = VNOVAL; vap->va_flags = VNOVAL; vap->va_rdev = VNOVAL; vap->va_bytes = VNOVAL; vap->va_filerev = VNOVAL; vap->va_vaflags = 0; } /* * Routines having to do with the management of the vnode table. */ long numvnodes; /* * Return the next vnode from the free list. */ int getnewvnode(enum vtagtype tag, struct mount *mp, const struct vops *vops, struct vnode **vpp) { struct proc *p = curproc; struct freelst *listhd; static int toggle; struct vnode *vp; int s; /* * allow maxvnodes to increase if the buffer cache itself * is big enough to justify it. (we don't shrink it ever) */ maxvnodes = maxvnodes < bcstats.numbufs ? bcstats.numbufs : maxvnodes; /* * We must choose whether to allocate a new vnode or recycle an * existing one. The criterion for allocating a new one is that * the total number of vnodes is less than the number desired or * there are no vnodes on either free list. Generally we only * want to recycle vnodes that have no buffers associated with * them, so we look first on the vnode_free_list. If it is empty, * we next consider vnodes with referencing buffers on the * vnode_hold_list. The toggle ensures that half the time we * will use a buffer from the vnode_hold_list, and half the time * we will allocate a new one unless the list has grown to twice * the desired size. We are reticent to recycle vnodes from the * vnode_hold_list because we will lose the identity of all its * referencing buffers. */ toggle ^= 1; if (numvnodes / 2 > maxvnodes) toggle = 0; s = splbio(); if ((numvnodes < maxvnodes) || ((TAILQ_FIRST(listhd = &vnode_free_list) == NULL) && ((TAILQ_FIRST(listhd = &vnode_hold_list) == NULL) || toggle))) { splx(s); vp = pool_get(&vnode_pool, PR_WAITOK | PR_ZERO); vp->v_uvm = pool_get(&uvm_vnode_pool, PR_WAITOK | PR_ZERO); vp->v_uvm->u_vnode = vp; uvm_obj_init(&vp->v_uvm->u_obj, &uvm_vnodeops, 0); RBT_INIT(buf_rb_bufs, &vp->v_bufs_tree); cache_tree_init(&vp->v_nc_tree); TAILQ_INIT(&vp->v_cache_dst); numvnodes++; } else { TAILQ_FOREACH(vp, listhd, v_freelist) { if (VOP_ISLOCKED(vp) == 0) break; } /* * Unless this is a bad time of the month, at most * the first NCPUS items on the free list are * locked, so this is close enough to being empty. */ if (vp == NULL) { splx(s); tablefull("vnode"); *vpp = NULL; return (ENFILE); } #ifdef DIAGNOSTIC if (vp->v_usecount) { vprint("free vnode", vp); panic("free vnode isn't"); } #endif TAILQ_REMOVE(listhd, vp, v_freelist); vp->v_bioflag &= ~VBIOONFREELIST; splx(s); if (vp->v_type != VBAD) vgonel(vp, p); #ifdef DIAGNOSTIC if (vp->v_data) { vprint("cleaned vnode", vp); panic("cleaned vnode isn't"); } s = splbio(); if (vp->v_numoutput) panic("Clean vnode has pending I/O's"); splx(s); #endif vp->v_flag = 0; vp->v_socket = NULL; } cache_purge(vp); vp->v_type = VNON; vp->v_tag = tag; vp->v_op = vops; insmntque(vp, mp); *vpp = vp; vp->v_usecount = 1; vp->v_data = NULL; return (0); } /* * Move a vnode from one mount queue to another. */ void insmntque(struct vnode *vp, struct mount *mp) { /* * Delete from old mount point vnode list, if on one. */ if (vp->v_mount != NULL) TAILQ_REMOVE(&vp->v_mount->mnt_vnodelist, vp, v_mntvnodes); /* * Insert into list of vnodes for the new mount point, if available. */ if ((vp->v_mount = mp) != NULL) TAILQ_INSERT_TAIL(&mp->mnt_vnodelist, vp, v_mntvnodes); } /* * Create a vnode for a block device. * Used for root filesystem, argdev, and swap areas. * Also used for memory file system special devices. */ int bdevvp(dev_t dev, struct vnode **vpp) { return (getdevvp(dev, vpp, VBLK)); } /* * Create a vnode for a character device. * Used for console handling. */ int cdevvp(dev_t dev, struct vnode **vpp) { return (getdevvp(dev, vpp, VCHR)); } /* * Create a vnode for a device. * Used by bdevvp (block device) for root file system etc., * and by cdevvp (character device) for console. */ int getdevvp(dev_t dev, struct vnode **vpp, enum vtype type) { struct vnode *vp; struct vnode *nvp; int error; if (dev == NODEV) { *vpp = NULLVP; return (0); } error = getnewvnode(VT_NON, NULL, &spec_vops, &nvp); if (error) { *vpp = NULLVP; return (error); } vp = nvp; vp->v_type = type; if ((nvp = checkalias(vp, dev, NULL)) != NULL) { vput(vp); vp = nvp; } if (vp->v_type == VCHR && cdevsw[major(vp->v_rdev)].d_type == D_TTY) vp->v_flag |= VISTTY; *vpp = vp; return (0); } /* * Check to see if the new vnode represents a special device * for which we already have a vnode (either because of * bdevvp() or because of a different vnode representing * the same block device). If such an alias exists, deallocate * the existing contents and return the aliased vnode. The * caller is responsible for filling it with its new contents. */ struct vnode * checkalias(struct vnode *nvp, dev_t nvp_rdev, struct mount *mp) { struct proc *p = curproc; struct vnode *vp; struct vnodechain *vchain; if (nvp->v_type != VBLK && nvp->v_type != VCHR) return (NULLVP); vchain = &speclisth[SPECHASH(nvp_rdev)]; loop: SLIST_FOREACH(vp, vchain, v_specnext) { if (nvp_rdev != vp->v_rdev || nvp->v_type != vp->v_type) { continue; } /* * Alias, but not in use, so flush it out. */ if (vp->v_usecount == 0) { vgonel(vp, p); goto loop; } if (vget(vp, LK_EXCLUSIVE)) { goto loop; } break; } /* * Common case is actually in the if statement */ if (vp == NULL || !(vp->v_tag == VT_NON && vp->v_type == VBLK)) { nvp->v_specinfo = malloc(sizeof(struct specinfo), M_VNODE, M_WAITOK); nvp->v_rdev = nvp_rdev; nvp->v_hashchain = vchain; nvp->v_specmountpoint = NULL; nvp->v_speclockf = NULL; nvp->v_specbitmap = NULL; if (nvp->v_type == VCHR && (cdevsw[major(nvp_rdev)].d_flags & D_CLONE) && (minor(nvp_rdev) >> CLONE_SHIFT == 0)) { if (vp != NULLVP) nvp->v_specbitmap = vp->v_specbitmap; else nvp->v_specbitmap = malloc(CLONE_MAPSZ, M_VNODE, M_WAITOK | M_ZERO); } SLIST_INSERT_HEAD(vchain, nvp, v_specnext); if (vp != NULLVP) { nvp->v_flag |= VALIASED; vp->v_flag |= VALIASED; vput(vp); } return (NULLVP); } /* * This code is the uncommon case. It is called in case * we found an alias that was VT_NON && vtype of VBLK * This means we found a block device that was created * using bdevvp. * An example of such a vnode is the root partition device vnode * created in ffs_mountroot. * * The vnodes created by bdevvp should not be aliased (why?). */ VOP_UNLOCK(vp); vclean(vp, 0, p); vp->v_op = nvp->v_op; vp->v_tag = nvp->v_tag; nvp->v_type = VNON; insmntque(vp, mp); return (vp); } /* * Grab a particular vnode from the free list, increment its * reference count and lock it. If the vnode lock bit is set, * the vnode is being eliminated in vgone. In that case, we * cannot grab it, so the process is awakened when the * transition is completed, and an error code is returned to * indicate that the vnode is no longer usable, possibly * having been changed to a new file system type. */ int vget(struct vnode *vp, int flags) { int error, s, onfreelist; /* * If the vnode is in the process of being cleaned out for * another use, we wait for the cleaning to finish and then * return failure. Cleaning is determined by checking that * the VXLOCK flag is set. */ mtx_enter(&vnode_mtx); if (vp->v_lflag & VXLOCK) { if (flags & LK_NOWAIT) { mtx_leave(&vnode_mtx); return (EBUSY); } vp->v_lflag |= VXWANT; msleep_nsec(vp, &vnode_mtx, PINOD, "vget", INFSLP); mtx_leave(&vnode_mtx); return (ENOENT); } mtx_leave(&vnode_mtx); s = splbio(); onfreelist = vp->v_bioflag & VBIOONFREELIST; if (vp->v_usecount == 0 && onfreelist) { if (vp->v_holdcnt > 0) TAILQ_REMOVE(&vnode_hold_list, vp, v_freelist); else TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); vp->v_bioflag &= ~VBIOONFREELIST; } splx(s); vp->v_usecount++; if (flags & LK_TYPE_MASK) { if ((error = vn_lock(vp, flags)) != 0) { vp->v_usecount--; if (vp->v_usecount == 0 && onfreelist) vputonfreelist(vp); } return (error); } return (0); } /* Vnode reference. */ void vref(struct vnode *vp) { KERNEL_ASSERT_LOCKED(); #ifdef DIAGNOSTIC if (vp->v_usecount == 0) panic("vref used where vget required"); if (vp->v_type == VNON) panic("vref on a VNON vnode"); #endif vp->v_usecount++; } void vputonfreelist(struct vnode *vp) { int s; struct freelst *lst; s = splbio(); #ifdef DIAGNOSTIC if (vp->v_usecount != 0) panic("Use count is not zero!"); /* * If the hold count is still positive, one or many threads could still * be waiting on the vnode lock inside uvn_io(). */ if (vp->v_holdcnt == 0 && vp->v_lockcount != 0) panic("%s: lock count is not zero", __func__); if (vp->v_bioflag & VBIOONFREELIST) { vprint("vnode already on free list: ", vp); panic("vnode already on free list"); } #endif vp->v_bioflag |= VBIOONFREELIST; vp->v_bioflag &= ~VBIOERROR; if (vp->v_holdcnt > 0) lst = &vnode_hold_list; else lst = &vnode_free_list; if (vp->v_type == VBAD) TAILQ_INSERT_HEAD(lst, vp, v_freelist); else TAILQ_INSERT_TAIL(lst, vp, v_freelist); splx(s); } /* * vput(), just unlock and vrele() */ void vput(struct vnode *vp) { struct proc *p = curproc; int s; #ifdef DIAGNOSTIC if (vp == NULL) panic("vput: null vp"); #endif #ifdef DIAGNOSTIC if (vp->v_usecount == 0) { vprint("vput: bad ref count", vp); panic("vput: ref cnt"); } #endif vp->v_usecount--; KASSERT(vp->v_usecount > 0 || vp->v_uvcount == 0); if (vp->v_usecount > 0) { VOP_UNLOCK(vp); return; } #ifdef DIAGNOSTIC if (vp->v_writecount != 0) { vprint("vput: bad writecount", vp); panic("vput: v_writecount != 0"); } #endif VOP_INACTIVE(vp, p); s = splbio(); if (vp->v_usecount == 0 && !(vp->v_bioflag & VBIOONFREELIST)) vputonfreelist(vp); splx(s); } /* * Vnode release - use for active VNODES. * If count drops to zero, call inactive routine and return to freelist. * Returns 0 if it did not sleep. */ int vrele(struct vnode *vp) { struct proc *p = curproc; int s; #ifdef DIAGNOSTIC if (vp == NULL) panic("vrele: null vp"); #endif #ifdef DIAGNOSTIC if (vp->v_usecount == 0) { vprint("vrele: bad ref count", vp); panic("vrele: ref cnt"); } #endif vp->v_usecount--; if (vp->v_usecount > 0) { return (0); } #ifdef DIAGNOSTIC if (vp->v_writecount != 0) { vprint("vrele: bad writecount", vp); panic("vrele: v_writecount != 0"); } #endif if (vn_lock(vp, LK_EXCLUSIVE)) { #ifdef DIAGNOSTIC vprint("vrele: cannot lock", vp); #endif return (1); } VOP_INACTIVE(vp, p); s = splbio(); if (vp->v_usecount == 0 && !(vp->v_bioflag & VBIOONFREELIST)) vputonfreelist(vp); splx(s); return (1); } /* Page or buffer structure gets a reference. */ void vhold(struct vnode *vp) { int s; s = splbio(); /* * If it is on the freelist and the hold count is currently * zero, move it to the hold list. */ if ((vp->v_bioflag & VBIOONFREELIST) && vp->v_holdcnt == 0 && vp->v_usecount == 0) { TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); TAILQ_INSERT_TAIL(&vnode_hold_list, vp, v_freelist); } vp->v_holdcnt++; splx(s); } /* Lose interest in a vnode. */ void vdrop(struct vnode *vp) { int s; s = splbio(); #ifdef DIAGNOSTIC if (vp->v_holdcnt == 0) panic("vdrop: zero holdcnt"); #endif vp->v_holdcnt--; /* * If it is on the holdlist and the hold count drops to * zero, move it to the free list. */ if ((vp->v_bioflag & VBIOONFREELIST) && vp->v_holdcnt == 0 && vp->v_usecount == 0) { TAILQ_REMOVE(&vnode_hold_list, vp, v_freelist); TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist); } splx(s); } /* * Remove any vnodes in the vnode table belonging to mount point mp. * * If MNT_NOFORCE is specified, there should not be any active ones, * return error if any are found (nb: this is a user error, not a * system error). If MNT_FORCE is specified, detach any active vnodes * that are found. */ #ifdef DEBUG_SYSCTL int busyprt = 0; /* print out busy vnodes */ struct ctldebug debug_vfs_busyprt = { "vfs_busyprt", &busyprt }; #endif int vfs_mount_foreach_vnode(struct mount *mp, int (*func)(struct vnode *, void *), void *arg) { struct vnode *vp, *nvp; int error = 0; loop: TAILQ_FOREACH_SAFE(vp , &mp->mnt_vnodelist, v_mntvnodes, nvp) { if (vp->v_mount != mp) goto loop; error = func(vp, arg); if (error != 0) break; } return (error); } struct vflush_args { struct vnode *skipvp; int busy; int flags; }; int vflush_vnode(struct vnode *vp, void *arg) { struct vflush_args *va = arg; struct proc *p = curproc; int empty, s; if (vp == va->skipvp) { return (0); } if ((va->flags & SKIPSYSTEM) && (vp->v_flag & VSYSTEM)) { return (0); } /* * If WRITECLOSE is set, only flush out regular file * vnodes open for writing. */ if ((va->flags & WRITECLOSE) && (vp->v_writecount == 0 || vp->v_type != VREG)) { return (0); } /* * With v_usecount == 0, all we need to do is clear * out the vnode data structures and we are done. */ if (vp->v_usecount == 0) { vgonel(vp, p); return (0); } /* * If FORCECLOSE is set, forcibly close the vnode. * For block or character devices, revert to an * anonymous device. For all other files, just kill them. */ if (va->flags & FORCECLOSE) { if (vp->v_type != VBLK && vp->v_type != VCHR) { vgonel(vp, p); } else { vclean(vp, 0, p); vp->v_op = &spec_vops; insmntque(vp, NULL); } return (0); } /* * If set, this is allowed to ignore vnodes which don't * have changes pending to disk. * XXX Might be nice to check per-fs "inode" flags, but * generally the filesystem is sync'd already, right? */ s = splbio(); empty = (va->flags & IGNORECLEAN) && LIST_EMPTY(&vp->v_dirtyblkhd); splx(s); if (empty) return (0); #if defined(DEBUG_SYSCTL) && (defined(DEBUG) || defined(DIAGNOSTIC)) if (busyprt) vprint("vflush: busy vnode", vp); #endif va->busy++; return (0); } int vflush(struct mount *mp, struct vnode *skipvp, int flags) { struct vflush_args va; va.skipvp = skipvp; va.busy = 0; va.flags = flags; vfs_mount_foreach_vnode(mp, vflush_vnode, &va); if (va.busy) return (EBUSY); return (0); } /* * Disassociate the underlying file system from a vnode. */ void vclean(struct vnode *vp, int flags, struct proc *p) { int active, do_wakeup = 0; int s; /* * Check to see if the vnode is in use. * If so we have to reference it before we clean it out * so that its count cannot fall to zero and generate a * race against ourselves to recycle it. */ if ((active = vp->v_usecount) != 0) vp->v_usecount++; /* * Prevent the vnode from being recycled or * brought into use while we clean it out. */ mtx_enter(&vnode_mtx); if (vp->v_lflag & VXLOCK) panic("vclean: deadlock"); vp->v_lflag |= VXLOCK; if (vp->v_lockcount > 0) { /* * Ensure that any thread currently waiting on the same lock has * observed that the vnode is about to be exclusively locked * before continuing. */ msleep_nsec(&vp->v_lockcount, &vnode_mtx, PINOD, "vop_lock", INFSLP); KASSERT(vp->v_lockcount == 0); } mtx_leave(&vnode_mtx); /* * Even if the count is zero, the VOP_INACTIVE routine may still * have the object locked while it cleans it out. The VOP_LOCK * ensures that the VOP_INACTIVE routine is done with its work. * For active vnodes, it ensures that no other activity can * occur while the underlying object is being cleaned out. */ VOP_LOCK(vp, LK_EXCLUSIVE | LK_DRAIN); /* * Clean out any VM data associated with the vnode. */ uvm_vnp_terminate(vp); /* * Clean out any buffers associated with the vnode. */ if (flags & DOCLOSE) vinvalbuf(vp, V_SAVE, NOCRED, p, 0, INFSLP); /* * If purging an active vnode, it must be closed and * deactivated before being reclaimed. Note that the * VOP_INACTIVE will unlock the vnode */ if (active) { if (flags & DOCLOSE) VOP_CLOSE(vp, FNONBLOCK, NOCRED, p); VOP_INACTIVE(vp, p); } else { /* * Any other processes trying to obtain this lock must first * wait for VXLOCK to clear, then call the new lock operation. */ VOP_UNLOCK(vp); } /* * Reclaim the vnode. */ if (VOP_RECLAIM(vp, p)) panic("vclean: cannot reclaim"); if (active) { vp->v_usecount--; if (vp->v_usecount == 0) { s = splbio(); if (vp->v_holdcnt > 0) panic("vclean: not clean"); vputonfreelist(vp); splx(s); } } cache_purge(vp); /* * Done with purge, notify sleepers of the grim news. */ vp->v_op = &dead_vops; VN_KNOTE(vp, NOTE_REVOKE); vp->v_tag = VT_NON; #ifdef VFSLCKDEBUG vp->v_flag &= ~VLOCKSWORK; #endif mtx_enter(&vnode_mtx); vp->v_lflag &= ~VXLOCK; if (vp->v_lflag & VXWANT) { vp->v_lflag &= ~VXWANT; do_wakeup = 1; } mtx_leave(&vnode_mtx); if (do_wakeup) wakeup(vp); } /* * Recycle an unused vnode to the front of the free list. */ int vrecycle(struct vnode *vp, struct proc *p) { if (vp->v_usecount == 0) { vgonel(vp, p); return (1); } return (0); } /* * Eliminate all activity associated with a vnode * in preparation for reuse. */ void vgone(struct vnode *vp) { struct proc *p = curproc; vgonel(vp, p); } /* * vgone, with struct proc. */ void vgonel(struct vnode *vp, struct proc *p) { struct vnode *vq; struct vnode *vx; int s; KASSERT(vp->v_uvcount == 0); /* * If a vgone (or vclean) is already in progress, * wait until it is done and return. */ mtx_enter(&vnode_mtx); if (vp->v_lflag & VXLOCK) { vp->v_lflag |= VXWANT; msleep_nsec(vp, &vnode_mtx, PINOD, "vgone", INFSLP); mtx_leave(&vnode_mtx); return; } mtx_leave(&vnode_mtx); /* * Clean out the filesystem specific data. */ vclean(vp, DOCLOSE, p); /* * Delete from old mount point vnode list, if on one. */ if (vp->v_mount != NULL) insmntque(vp, NULL); /* * If special device, remove it from special device alias list * if it is on one. */ if ((vp->v_type == VBLK || vp->v_type == VCHR) && vp->v_specinfo != NULL) { if ((vp->v_flag & VALIASED) == 0 && vp->v_type == VCHR && (cdevsw[major(vp->v_rdev)].d_flags & D_CLONE) && (minor(vp->v_rdev) >> CLONE_SHIFT == 0)) { free(vp->v_specbitmap, M_VNODE, CLONE_MAPSZ); } SLIST_REMOVE(vp->v_hashchain, vp, vnode, v_specnext); if (vp->v_flag & VALIASED) { vx = NULL; SLIST_FOREACH(vq, vp->v_hashchain, v_specnext) { if (vq->v_rdev != vp->v_rdev || vq->v_type != vp->v_type) continue; if (vx) break; vx = vq; } if (vx == NULL) panic("missing alias"); if (vq == NULL) vx->v_flag &= ~VALIASED; vp->v_flag &= ~VALIASED; } lf_purgelocks(&vp->v_speclockf); free(vp->v_specinfo, M_VNODE, sizeof(struct specinfo)); vp->v_specinfo = NULL; } /* * If it is on the freelist and not already at the head, * move it to the head of the list. */ vp->v_type = VBAD; /* * Move onto the free list, unless we were called from * getnewvnode and we're not on any free list */ s = splbio(); if (vp->v_usecount == 0 && (vp->v_bioflag & VBIOONFREELIST)) { if (vp->v_holdcnt > 0) panic("vgonel: not clean"); if (TAILQ_FIRST(&vnode_free_list) != vp) { TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist); } } splx(s); } /* * Lookup a vnode by device number. */ int vfinddev(dev_t dev, enum vtype type, struct vnode **vpp) { struct vnode *vp; int rc =0; SLIST_FOREACH(vp, &speclisth[SPECHASH(dev)], v_specnext) { if (dev != vp->v_rdev || type != vp->v_type) continue; *vpp = vp; rc = 1; break; } return (rc); } /* * Revoke all the vnodes corresponding to the specified minor number * range (endpoints inclusive) of the specified major. */ void vdevgone(int maj, int minl, int minh, enum vtype type) { struct vnode *vp; int mn; for (mn = minl; mn <= minh; mn++) if (vfinddev(makedev(maj, mn), type, &vp)) VOP_REVOKE(vp, REVOKEALL); } /* * Calculate the total number of references to a special device. */ int vcount(struct vnode *vp) { struct vnode *vq; int count; loop: if ((vp->v_flag & VALIASED) == 0) return (vp->v_usecount); count = 0; SLIST_FOREACH(vq, vp->v_hashchain, v_specnext) { if (vq->v_rdev != vp->v_rdev || vq->v_type != vp->v_type) continue; /* * Alias, but not in use, so flush it out. */ if (vq->v_usecount == 0 && vq != vp) { vgone(vq); goto loop; } count += vq->v_usecount; } return (count); } #if defined(DEBUG) || defined(DIAGNOSTIC) /* * Print out a description of a vnode. */ static char *typename[] = { "VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD" }; void vprint(char *label, struct vnode *vp) { char buf[64]; if (label != NULL) printf("%s: ", label); printf("%p, type %s, use %u, write %u, hold %u,", vp, typename[vp->v_type], vp->v_usecount, vp->v_writecount, vp->v_holdcnt); buf[0] = '\0'; if (vp->v_flag & VROOT) strlcat(buf, "|VROOT", sizeof buf); if (vp->v_flag & VTEXT) strlcat(buf, "|VTEXT", sizeof buf); if (vp->v_flag & VSYSTEM) strlcat(buf, "|VSYSTEM", sizeof buf); if (vp->v_lflag & VXLOCK) strlcat(buf, "|VXLOCK", sizeof buf); if (vp->v_lflag & VXWANT) strlcat(buf, "|VXWANT", sizeof buf); if (vp->v_bioflag & VBIOWAIT) strlcat(buf, "|VBIOWAIT", sizeof buf); if (vp->v_bioflag & VBIOONFREELIST) strlcat(buf, "|VBIOONFREELIST", sizeof buf); if (vp->v_bioflag & VBIOONSYNCLIST) strlcat(buf, "|VBIOONSYNCLIST", sizeof buf); if (vp->v_flag & VALIASED) strlcat(buf, "|VALIASED", sizeof buf); if (buf[0] != '\0') printf(" flags (%s)", &buf[1]); if (vp->v_data == NULL) { printf("\n"); } else { printf("\n\t"); VOP_PRINT(vp); } } #endif /* DEBUG || DIAGNOSTIC */ #ifdef DEBUG /* * List all of the locked vnodes in the system. * Called when debugging the kernel. */ void printlockedvnodes(void) { struct mount *mp; struct vnode *vp; printf("Locked vnodes\n"); TAILQ_FOREACH(mp, &mountlist, mnt_list) { if (vfs_busy(mp, VB_READ|VB_NOWAIT)) continue; TAILQ_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { if (VOP_ISLOCKED(vp)) vprint(NULL, vp); } vfs_unbusy(mp); } } #endif /* * Top level filesystem related information gathering. */ int vfs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, size_t newlen, struct proc *p) { struct vfsconf *vfsp, *tmpvfsp; int ret; /* all sysctl names at this level are at least name and field */ if (namelen < 2) return (ENOTDIR); /* overloaded */ if (name[0] != VFS_GENERIC) { vfsp = vfs_bytypenum(name[0]); if (vfsp == NULL || vfsp->vfc_vfsops->vfs_sysctl == NULL) return (EOPNOTSUPP); return ((*vfsp->vfc_vfsops->vfs_sysctl)(&name[1], namelen - 1, oldp, oldlenp, newp, newlen, p)); } switch (name[1]) { case VFS_MAXTYPENUM: return (sysctl_rdint(oldp, oldlenp, newp, maxvfsconf)); case VFS_CONF: if (namelen < 3) return (ENOTDIR); /* overloaded */ vfsp = vfs_bytypenum(name[2]); if (vfsp == NULL) return (EOPNOTSUPP); /* Make a copy, clear out kernel pointers */ tmpvfsp = malloc(sizeof(*tmpvfsp), M_TEMP, M_WAITOK|M_ZERO); memcpy(tmpvfsp, vfsp, sizeof(*tmpvfsp)); tmpvfsp->vfc_vfsops = NULL; ret = sysctl_rdstruct(oldp, oldlenp, newp, tmpvfsp, sizeof(struct vfsconf)); free(tmpvfsp, M_TEMP, sizeof(*tmpvfsp)); return (ret); case VFS_BCACHESTAT: /* buffer cache statistics */ ret = sysctl_rdstruct(oldp, oldlenp, newp, &bcstats, sizeof(struct bcachestats)); return(ret); } return (EOPNOTSUPP); } /* * Check to see if a filesystem is mounted on a block device. */ int vfs_mountedon(struct vnode *vp) { struct vnode *vq; int error = 0; if (vp->v_specmountpoint != NULL) return (EBUSY); if (vp->v_flag & VALIASED) { SLIST_FOREACH(vq, vp->v_hashchain, v_specnext) { if (vq->v_rdev != vp->v_rdev || vq->v_type != vp->v_type) continue; if (vq->v_specmountpoint != NULL) { error = EBUSY; break; } } } return (error); } #ifdef NFSSERVER /* * Build hash lists of net addresses and hang them off the mount point. * Called by vfs_export() to set up the lists of export addresses. */ int vfs_hang_addrlist(struct mount *mp, struct netexport *nep, struct export_args *argp) { struct netcred *np; struct radix_node_head *rnh; int nplen, i; struct radix_node *rn; struct sockaddr *saddr, *smask = NULL; int error; if (argp->ex_addrlen == 0) { if (mp->mnt_flag & MNT_DEFEXPORTED) return (EPERM); np = &nep->ne_defexported; /* fill in the kernel's ucred from userspace's xucred */ if ((error = crfromxucred(&np->netc_anon, &argp->ex_anon))) return (error); mp->mnt_flag |= MNT_DEFEXPORTED; goto finish; } if (argp->ex_addrlen > MLEN || argp->ex_masklen > MLEN || argp->ex_addrlen < 0 || argp->ex_masklen < 0) return (EINVAL); nplen = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen; np = (struct netcred *)malloc(nplen, M_NETADDR, M_WAITOK|M_ZERO); np->netc_len = nplen; saddr = (struct sockaddr *)(np + 1); error = copyin(argp->ex_addr, saddr, argp->ex_addrlen); if (error) goto out; if (saddr->sa_len > argp->ex_addrlen) saddr->sa_len = argp->ex_addrlen; if (argp->ex_masklen) { smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen); error = copyin(argp->ex_mask, smask, argp->ex_masklen); if (error) goto out; if (smask->sa_len > argp->ex_masklen) smask->sa_len = argp->ex_masklen; } /* fill in the kernel's ucred from userspace's xucred */ if ((error = crfromxucred(&np->netc_anon, &argp->ex_anon))) goto out; i = saddr->sa_family; switch (i) { case AF_INET: if ((rnh = nep->ne_rtable_inet) == NULL) { if (!rn_inithead((void **)&nep->ne_rtable_inet, offsetof(struct sockaddr_in, sin_addr))) { error = ENOBUFS; goto out; } rnh = nep->ne_rtable_inet; } break; default: error = EINVAL; goto out; } rn = rn_addroute(saddr, smask, rnh, np->netc_rnodes, 0); if (rn == NULL || np != (struct netcred *)rn) { /* already exists */ error = EPERM; goto out; } finish: np->netc_exflags = argp->ex_flags; return (0); out: free(np, M_NETADDR, np->netc_len); return (error); } int vfs_free_netcred(struct radix_node *rn, void *w, u_int id) { struct radix_node_head *rnh = (struct radix_node_head *)w; struct netcred * np = (struct netcred *)rn; rn_delete(rn->rn_key, rn->rn_mask, rnh, NULL); free(np, M_NETADDR, np->netc_len); return (0); } /* * Free the net address hash lists that are hanging off the mount points. */ void vfs_free_addrlist(struct netexport *nep) { struct radix_node_head *rnh; if ((rnh = nep->ne_rtable_inet) != NULL) { rn_walktree(rnh, vfs_free_netcred, rnh); free(rnh, M_RTABLE, sizeof(*rnh)); nep->ne_rtable_inet = NULL; } } #endif /* NFSSERVER */ int vfs_export(struct mount *mp, struct netexport *nep, struct export_args *argp) { #ifdef NFSSERVER int error; if (argp->ex_flags & MNT_DELEXPORT) { vfs_free_addrlist(nep); mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED); } if (argp->ex_flags & MNT_EXPORTED) { if ((error = vfs_hang_addrlist(mp, nep, argp)) != 0) return (error); mp->mnt_flag |= MNT_EXPORTED; } return (0); #else return (ENOTSUP); #endif /* NFSSERVER */ } struct netcred * vfs_export_lookup(struct mount *mp, struct netexport *nep, struct mbuf *nam) { #ifdef NFSSERVER struct netcred *np; struct radix_node_head *rnh; struct sockaddr *saddr; np = NULL; if (mp->mnt_flag & MNT_EXPORTED) { /* * Lookup in the export list first. */ if (nam != NULL) { saddr = mtod(nam, struct sockaddr *); switch(saddr->sa_family) { case AF_INET: rnh = nep->ne_rtable_inet; break; default: rnh = NULL; break; } if (rnh != NULL) np = (struct netcred *)rn_match(saddr, rnh); } /* * If no address match, use the default if it exists. */ if (np == NULL && mp->mnt_flag & MNT_DEFEXPORTED) np = &nep->ne_defexported; } return (np); #else return (NULL); #endif /* NFSSERVER */ } /* * Do the usual access checking. * file_mode, uid and gid are from the vnode in question, * while acc_mode and cred are from the VOP_ACCESS parameter list */ int vaccess(enum vtype type, mode_t file_mode, uid_t uid, gid_t gid, mode_t acc_mode, struct ucred *cred) { mode_t mask; /* User id 0 always gets read/write access. */ if (cred->cr_uid == 0) { /* For VEXEC, at least one of the execute bits must be set. */ if ((acc_mode & VEXEC) && type != VDIR && (file_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) return EACCES; return 0; } mask = 0; /* Otherwise, check the owner. */ if (cred->cr_uid == uid) { if (acc_mode & VEXEC) mask |= S_IXUSR; if (acc_mode & VREAD) mask |= S_IRUSR; if (acc_mode & VWRITE) mask |= S_IWUSR; return (file_mode & mask) == mask ? 0 : EACCES; } /* Otherwise, check the groups. */ if (groupmember(gid, cred)) { if (acc_mode & VEXEC) mask |= S_IXGRP; if (acc_mode & VREAD) mask |= S_IRGRP; if (acc_mode & VWRITE) mask |= S_IWGRP; return (file_mode & mask) == mask ? 0 : EACCES; } /* Otherwise, check everyone else. */ if (acc_mode & VEXEC) mask |= S_IXOTH; if (acc_mode & VREAD) mask |= S_IROTH; if (acc_mode & VWRITE) mask |= S_IWOTH; return (file_mode & mask) == mask ? 0 : EACCES; } int vnoperm(struct vnode *vp) { if (vp->v_flag & VROOT || vp->v_mount == NULL) return 0; return (vp->v_mount->mnt_flag & MNT_NOPERM); } struct rwlock vfs_stall_lock = RWLOCK_INITIALIZER("vfs_stall"); unsigned int vfs_stalling = 0; int vfs_stall(struct proc *p, int stall) { struct mount *mp; int allerror = 0, error; if (stall) { atomic_inc_int(&vfs_stalling); rw_enter_write(&vfs_stall_lock); } /* * The loop variable mp is protected by vfs_busy() so that it cannot * be unmounted while VFS_SYNC() sleeps. Traverse forward to keep the * lock order consistent with dounmount(). */ TAILQ_FOREACH(mp, &mountlist, mnt_list) { if (stall) { error = vfs_busy(mp, VB_WRITE|VB_WAIT|VB_DUPOK); if (error) { printf("%s: busy\n", mp->mnt_stat.f_mntonname); allerror = error; continue; } uvm_vnp_sync(mp); error = VFS_SYNC(mp, MNT_WAIT, stall, p->p_ucred, p); if (error) { printf("%s: failed to sync\n", mp->mnt_stat.f_mntonname); vfs_unbusy(mp); allerror = error; continue; } mp->mnt_flag |= MNT_STALLED; } else { if (mp->mnt_flag & MNT_STALLED) { vfs_unbusy(mp); mp->mnt_flag &= ~MNT_STALLED; } } } if (!stall) { rw_exit_write(&vfs_stall_lock); atomic_dec_int(&vfs_stalling); } return (allerror); } void vfs_stall_barrier(void) { if (__predict_false(vfs_stalling)) { rw_enter_read(&vfs_stall_lock); rw_exit_read(&vfs_stall_lock); } } /* * Unmount all file systems. * We traverse the list in reverse order under the assumption that doing so * will avoid needing to worry about dependencies. */ void vfs_unmountall(void) { struct mount *mp, *nmp; int allerror, error, again = 1; retry: allerror = 0; TAILQ_FOREACH_REVERSE_SAFE(mp, &mountlist, mntlist, mnt_list, nmp) { if (vfs_busy(mp, VB_WRITE|VB_NOWAIT)) continue; /* XXX Here is a race, the next pointer is not locked. */ if ((error = dounmount(mp, MNT_FORCE, curproc)) != 0) { printf("unmount of %s failed with error %d\n", mp->mnt_stat.f_mntonname, error); allerror = 1; } } if (allerror) { printf("WARNING: some file systems would not unmount\n"); if (again) { printf("retrying\n"); again = 0; goto retry; } } } /* * Sync and unmount file systems before shutting down. */ void vfs_shutdown(struct proc *p) { #ifdef ACCOUNTING acct_shutdown(); #endif printf("syncing disks..."); if (panicstr == NULL) { /* Sync before unmount, in case we hang on something. */ sys_sync(p, NULL, NULL); vfs_unmountall(); } #if NSOFTRAID > 0 sr_quiesce(); #endif if (vfs_syncwait(p, 1)) printf(" giving up\n"); else printf(" done\n"); } /* * perform sync() operation and wait for buffers to flush. */ int vfs_syncwait(struct proc *p, int verbose) { struct buf *bp; int iter, nbusy, dcount, s; #ifdef MULTIPROCESSOR int hold_count; #endif sys_sync(p, NULL, NULL); /* Wait for sync to finish. */ dcount = 10000; for (iter = 0; iter < 20; iter++) { nbusy = 0; LIST_FOREACH(bp, &bufhead, b_list) { if ((bp->b_flags & (B_BUSY|B_INVAL|B_READ)) == B_BUSY) nbusy++; /* * With soft updates, some buffers that are * written will be remarked as dirty until other * buffers are written. * * XXX here be dragons. this should really go away * but should be carefully made to go away on it's * own with testing.. XXX */ if (bp->b_flags & B_DELWRI) { s = splbio(); bremfree(bp); buf_acquire(bp); splx(s); nbusy++; bawrite(bp); if (dcount-- <= 0) { if (verbose) printf("softdep "); return 1; } } } if (nbusy == 0) break; if (verbose) printf("%d ", nbusy); #ifdef MULTIPROCESSOR if (_kernel_lock_held()) hold_count = __mp_release_all(&kernel_lock); else hold_count = 0; #endif DELAY(40000 * iter); #ifdef MULTIPROCESSOR if (hold_count) __mp_acquire_count(&kernel_lock, hold_count); #endif } return nbusy; } /* * posix file system related system variables. */ int fs_posix_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, size_t newlen, struct proc *p) { /* all sysctl names at this level are terminal */ if (namelen != 1) return (ENOTDIR); switch (name[0]) { case FS_POSIX_SETUID: return (sysctl_securelevel_int(oldp, oldlenp, newp, newlen, &suid_clear)); default: return (EOPNOTSUPP); } /* NOTREACHED */ } /* * file system related system variables. */ int fs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, size_t newlen, struct proc *p) { sysctlfn *fn; switch (name[0]) { case FS_POSIX: fn = fs_posix_sysctl; break; default: return (EOPNOTSUPP); } return (*fn)(name + 1, namelen - 1, oldp, oldlenp, newp, newlen, p); } /* * Routines dealing with vnodes and buffers */ /* * Wait for all outstanding I/Os to complete * * Manipulates v_numoutput. Must be called at splbio() */ int vwaitforio(struct vnode *vp, int slpflag, char *wmesg, uint64_t timeo) { int error = 0; splassert(IPL_BIO); while (vp->v_numoutput) { vp->v_bioflag |= VBIOWAIT; error = tsleep_nsec(&vp->v_numoutput, slpflag | (PRIBIO + 1), wmesg, timeo); if (error) break; } return (error); } /* * Update outstanding I/O count and do wakeup if requested. * * Manipulates v_numoutput. Must be called at splbio() */ void vwakeup(struct vnode *vp) { splassert(IPL_BIO); if (vp != NULL) { if (vp->v_numoutput-- == 0) panic("vwakeup: neg numoutput"); if ((vp->v_bioflag & VBIOWAIT) && vp->v_numoutput == 0) { vp->v_bioflag &= ~VBIOWAIT; wakeup(&vp->v_numoutput); } } } /* * Flush out and invalidate all buffers associated with a vnode. * Called with the underlying object locked. */ int vinvalbuf(struct vnode *vp, int flags, struct ucred *cred, struct proc *p, int slpflag, uint64_t slptimeo) { struct buf *bp; struct buf *nbp, *blist; int s, error; #ifdef VFSLCKDEBUG if ((vp->v_flag & VLOCKSWORK) && !VOP_ISLOCKED(vp)) panic("%s: vp isn't locked, vp %p", __func__, vp); #endif if (flags & V_SAVE) { s = splbio(); vwaitforio(vp, 0, "vinvalbuf", INFSLP); if (!LIST_EMPTY(&vp->v_dirtyblkhd)) { splx(s); if ((error = VOP_FSYNC(vp, cred, MNT_WAIT, p)) != 0) return (error); s = splbio(); if (vp->v_numoutput > 0 || !LIST_EMPTY(&vp->v_dirtyblkhd)) panic("%s: dirty bufs, vp %p", __func__, vp); } splx(s); } loop: s = splbio(); for (;;) { int count = 0; if ((blist = LIST_FIRST(&vp->v_cleanblkhd)) && (flags & V_SAVEMETA)) while (blist && blist->b_lblkno < 0) blist = LIST_NEXT(blist, b_vnbufs); if (blist == NULL && (blist = LIST_FIRST(&vp->v_dirtyblkhd)) && (flags & V_SAVEMETA)) while (blist && blist->b_lblkno < 0) blist = LIST_NEXT(blist, b_vnbufs); if (!blist) break; for (bp = blist; bp; bp = nbp) { nbp = LIST_NEXT(bp, b_vnbufs); if (flags & V_SAVEMETA && bp->b_lblkno < 0) continue; if (bp->b_flags & B_BUSY) { bp->b_flags |= B_WANTED; error = tsleep_nsec(bp, slpflag | (PRIBIO + 1), "vinvalbuf", slptimeo); if (error) { splx(s); return (error); } break; } bremfree(bp); /* * XXX Since there are no node locks for NFS, I believe * there is a slight chance that a delayed write will * occur while sleeping just above, so check for it. */ if ((bp->b_flags & B_DELWRI) && (flags & V_SAVE)) { buf_acquire(bp); splx(s); (void) VOP_BWRITE(bp); goto loop; } buf_acquire_nomap(bp); bp->b_flags |= B_INVAL; brelse(bp); count++; /* * XXX Temporary workaround XXX * * If this is a gigantisch vnode and we are * trashing a ton of buffers, drop the lock * and yield every so often. The longer term * fix is to add a separate list for these * invalid buffers so we don't have to do the * work to free these here. */ if (count > 100) { splx(s); sched_pause(yield); goto loop; } } } if (!(flags & V_SAVEMETA) && (!LIST_EMPTY(&vp->v_dirtyblkhd) || !LIST_EMPTY(&vp->v_cleanblkhd))) panic("%s: flush failed, vp %p", __func__, vp); splx(s); return (0); } void vflushbuf(struct vnode *vp, int sync) { struct buf *bp, *nbp; int s; loop: s = splbio(); LIST_FOREACH_SAFE(bp, &vp->v_dirtyblkhd, b_vnbufs, nbp) { if ((bp->b_flags & B_BUSY)) continue; if ((bp->b_flags & B_DELWRI) == 0) panic("vflushbuf: not dirty"); bremfree(bp); buf_acquire(bp); splx(s); /* * Wait for I/O associated with indirect blocks to complete, * since there is no way to quickly wait for them below. */ if (bp->b_vp == vp || sync == 0) (void) bawrite(bp); else (void) bwrite(bp); goto loop; } if (sync == 0) { splx(s); return; } vwaitforio(vp, 0, "vflushbuf", INFSLP); if (!LIST_EMPTY(&vp->v_dirtyblkhd)) { splx(s); #ifdef DIAGNOSTIC vprint("vflushbuf: dirty", vp); #endif goto loop; } splx(s); } /* * Associate a buffer with a vnode. * * Manipulates buffer vnode queues. Must be called at splbio(). */ void bgetvp(struct vnode *vp, struct buf *bp) { splassert(IPL_BIO); if (bp->b_vp) panic("bgetvp: not free"); vhold(vp); bp->b_vp = vp; if (vp->v_type == VBLK || vp->v_type == VCHR) bp->b_dev = vp->v_rdev; else bp->b_dev = NODEV; /* * Insert onto list for new vnode. */ bufinsvn(bp, &vp->v_cleanblkhd); } /* * Disassociate a buffer from a vnode. * * Manipulates vnode buffer queues. Must be called at splbio(). */ void brelvp(struct buf *bp) { struct vnode *vp; splassert(IPL_BIO); if ((vp = bp->b_vp) == (struct vnode *) 0) panic("brelvp: NULL"); /* * Delete from old vnode list, if on one. */ if (LIST_NEXT(bp, b_vnbufs) != NOLIST) bufremvn(bp); if ((vp->v_bioflag & VBIOONSYNCLIST) && LIST_EMPTY(&vp->v_dirtyblkhd)) { vp->v_bioflag &= ~VBIOONSYNCLIST; LIST_REMOVE(vp, v_synclist); } bp->b_vp = NULL; vdrop(vp); } /* * Replaces the current vnode associated with the buffer, if any, * with a new vnode. * * If an output I/O is pending on the buffer, the old vnode * I/O count is adjusted. * * Ignores vnode buffer queues. Must be called at splbio(). */ void buf_replacevnode(struct buf *bp, struct vnode *newvp) { struct vnode *oldvp = bp->b_vp; splassert(IPL_BIO); if (oldvp) brelvp(bp); if ((bp->b_flags & (B_READ | B_DONE)) == 0) { newvp->v_numoutput++; /* put it on swapdev */ vwakeup(oldvp); } bgetvp(newvp, bp); bufremvn(bp); } /* * Used to assign buffers to the appropriate clean or dirty list on * the vnode and to add newly dirty vnodes to the appropriate * filesystem syncer list. * * Manipulates vnode buffer queues. Must be called at splbio(). */ void reassignbuf(struct buf *bp) { struct buflists *listheadp; int delay; struct vnode *vp = bp->b_vp; splassert(IPL_BIO); /* * Delete from old vnode list, if on one. */ if (LIST_NEXT(bp, b_vnbufs) != NOLIST) bufremvn(bp); /* * If dirty, put on list of dirty buffers; * otherwise insert onto list of clean buffers. */ if ((bp->b_flags & B_DELWRI) == 0) { listheadp = &vp->v_cleanblkhd; if ((vp->v_bioflag & VBIOONSYNCLIST) && LIST_EMPTY(&vp->v_dirtyblkhd)) { vp->v_bioflag &= ~VBIOONSYNCLIST; LIST_REMOVE(vp, v_synclist); } } else { listheadp = &vp->v_dirtyblkhd; if ((vp->v_bioflag & VBIOONSYNCLIST) == 0) { switch (vp->v_type) { case VDIR: delay = syncdelay / 2; break; case VBLK: if (vp->v_specmountpoint != NULL) { delay = syncdelay / 3; break; } /* FALLTHROUGH */ default: delay = syncdelay; } vn_syncer_add_to_worklist(vp, delay); } } bufinsvn(bp, listheadp); } #ifdef DDB #include #include void vfs_buf_print(void *b, int full, int (*pr)(const char *, ...) __attribute__((__format__(__kprintf__,1,2)))) { struct buf *bp = b; (*pr)(" vp %p lblkno 0x%llx blkno 0x%llx dev 0x%x\n" " proc %p error %d flags %lb\n", bp->b_vp, (int64_t)bp->b_lblkno, (int64_t)bp->b_blkno, bp->b_dev, bp->b_proc, bp->b_error, bp->b_flags, B_BITS); (*pr)(" bufsize 0x%lx bcount 0x%lx resid 0x%lx\n" " data %p saveaddr %p iodone %p\n", bp->b_bufsize, bp->b_bcount, (long)bp->b_resid, bp->b_data, bp->b_saveaddr, bp->b_iodone); (*pr)(" dirty {off 0x%x end 0x%x} valid {off 0x%x end 0x%x}\n", bp->b_dirtyoff, bp->b_dirtyend, bp->b_validoff, bp->b_validend); } const char *vtypes[] = { VTYPE_NAMES }; const char *vtags[] = { VTAG_NAMES }; void vfs_vnode_print(void *v, int full, int (*pr)(const char *, ...) __attribute__((__format__(__kprintf__,1,2)))) { struct vnode *vp = v; (*pr)("tag %s(%d) type %s(%d) mount %p typedata %p\n", (u_int)vp->v_tag >= nitems(vtags)? "":vtags[vp->v_tag], vp->v_tag, (u_int)vp->v_type >= nitems(vtypes)? "":vtypes[vp->v_type], vp->v_type, vp->v_mount, vp->v_mountedhere); (*pr)("data %p usecount %d writecount %d holdcnt %d numoutput %d\n", vp->v_data, vp->v_usecount, vp->v_writecount, vp->v_holdcnt, vp->v_numoutput); /* uvm_object_printit(&vp->v_uobj, full, pr); */ if (full) { struct buf *bp; (*pr)("clean bufs:\n"); LIST_FOREACH(bp, &vp->v_cleanblkhd, b_vnbufs) { (*pr)(" bp %p\n", bp); vfs_buf_print(bp, full, pr); } (*pr)("dirty bufs:\n"); LIST_FOREACH(bp, &vp->v_dirtyblkhd, b_vnbufs) { (*pr)(" bp %p\n", bp); vfs_buf_print(bp, full, pr); } } } void vfs_mount_print(struct mount *mp, int full, int (*pr)(const char *, ...) __attribute__((__format__(__kprintf__,1,2)))) { struct vfsconf *vfc = mp->mnt_vfc; struct vnode *vp; int cnt; (*pr)("flags %b\nvnodecovered %p syncer %p data %p\n", mp->mnt_flag, MNT_BITS, mp->mnt_vnodecovered, mp->mnt_syncer, mp->mnt_data); (*pr)("vfsconf: ops %p name \"%s\" num %d ref %u flags 0x%x\n", vfc->vfc_vfsops, vfc->vfc_name, vfc->vfc_typenum, vfc->vfc_refcount, vfc->vfc_flags); (*pr)("statvfs cache: bsize %x iosize %x\n" "blocks %llu free %llu avail %lld\n", mp->mnt_stat.f_bsize, mp->mnt_stat.f_iosize, mp->mnt_stat.f_blocks, mp->mnt_stat.f_bfree, mp->mnt_stat.f_bavail); (*pr)(" files %llu ffiles %llu favail %lld\n", mp->mnt_stat.f_files, mp->mnt_stat.f_ffree, mp->mnt_stat.f_favail); (*pr)(" f_fsidx {0x%x, 0x%x} owner %u ctime 0x%llx\n", mp->mnt_stat.f_fsid.val[0], mp->mnt_stat.f_fsid.val[1], mp->mnt_stat.f_owner, mp->mnt_stat.f_ctime); (*pr)(" syncwrites %llu asyncwrites = %llu\n", mp->mnt_stat.f_syncwrites, mp->mnt_stat.f_asyncwrites); (*pr)(" syncreads %llu asyncreads = %llu\n", mp->mnt_stat.f_syncreads, mp->mnt_stat.f_asyncreads); (*pr)(" fstype \"%s\" mnton \"%s\" mntfrom \"%s\" mntspec \"%s\"\n", mp->mnt_stat.f_fstypename, mp->mnt_stat.f_mntonname, mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntfromspec); (*pr)("locked vnodes:"); /* XXX would take mountlist lock, except ddb has no context */ cnt = 0; TAILQ_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { if (VOP_ISLOCKED(vp)) { if (cnt == 0) (*pr)("\n %p", vp); else if ((cnt % (72 / (sizeof(void *) * 2 + 4))) == 0) (*pr)(",\n %p", vp); else (*pr)(", %p", vp); cnt++; } } (*pr)("\n"); if (full) { (*pr)("all vnodes:"); /* XXX would take mountlist lock, except ddb has no context */ cnt = 0; TAILQ_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { if (cnt == 0) (*pr)("\n %p", vp); else if ((cnt % (72 / (sizeof(void *) * 2 + 4))) == 0) (*pr)(",\n %p", vp); else (*pr)(", %p", vp); cnt++; } (*pr)("\n"); } } #endif /* DDB */ void copy_statfs_info(struct statfs *sbp, const struct mount *mp) { const struct statfs *mbp; strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); if (sbp == (mbp = &mp->mnt_stat)) return; sbp->f_fsid = mbp->f_fsid; sbp->f_owner = mbp->f_owner; sbp->f_flags = mbp->f_flags; sbp->f_syncwrites = mbp->f_syncwrites; sbp->f_asyncwrites = mbp->f_asyncwrites; sbp->f_syncreads = mbp->f_syncreads; sbp->f_asyncreads = mbp->f_asyncreads; sbp->f_namemax = mbp->f_namemax; memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN); memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN); memcpy(sbp->f_mntfromspec, mp->mnt_stat.f_mntfromspec, MNAMELEN); memcpy(&sbp->mount_info, &mp->mnt_stat.mount_info, sizeof(union mount_info)); }