diff options
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/conf/files | 1 | ||||
| -rw-r--r-- | sys/kern/vfs_export.c | 2856 | ||||
| -rw-r--r-- | sys/kern/vfs_subr.c | 346 |
3 files changed, 5 insertions, 3198 deletions
diff --git a/sys/conf/files b/sys/conf/files index 8aac5a8..fe4f634 100644 --- a/sys/conf/files +++ b/sys/conf/files @@ -751,6 +751,7 @@ kern/vfs_cache.c standard kern/vfs_cluster.c standard kern/vfs_conf.c standard kern/vfs_default.c standard +kern/vfs_export.c standard kern/vfs_init.c standard kern/vfs_lookup.c standard kern/vfs_subr.c standard diff --git a/sys/kern/vfs_export.c b/sys/kern/vfs_export.c index 4bb58fe..64677cb 100644 --- a/sys/kern/vfs_export.c +++ b/sys/kern/vfs_export.c @@ -39,220 +39,19 @@ * $FreeBSD$ */ -/* - * External virtual filesystem routines - */ -#include "opt_ddb.h" -#include "opt_ffs.h" - #include <sys/param.h> #include <sys/systm.h> -#include <sys/bio.h> -#include <sys/buf.h> -#include <sys/conf.h> -#include <sys/dirent.h> -#include <sys/domain.h> -#include <sys/eventhandler.h> -#include <sys/event.h> -#include <sys/fcntl.h> #include <sys/kernel.h> -#include <sys/kthread.h> -#include <sys/ktr.h> -#include <sys/malloc.h> -#include <net/radix.h> #include <sys/socket.h> +#include <sys/malloc.h> #include <sys/mount.h> -#include <sys/mutex.h> -#include <sys/namei.h> -#include <sys/proc.h> -#include <sys/reboot.h> -#include <sys/socket.h> -#include <sys/stat.h> -#include <sys/sysctl.h> -#include <sys/vmmeter.h> -#include <sys/vnode.h> - -#include <machine/limits.h> #include <net/radix.h> -#include <vm/vm.h> -#include <vm/vm_object.h> -#include <vm/vm_extern.h> -#include <vm/pmap.h> -#include <vm/vm_map.h> -#include <vm/vm_page.h> -#include <vm/vm_pager.h> -#include <vm/vnode_pager.h> -#include <vm/vm_zone.h> +#include <sys/domain.h> +#include <sys/dirent.h> +#include <sys/vnode.h> static MALLOC_DEFINE(M_NETADDR, "Export Host", "Export host address structure"); -static void addalias __P((struct vnode *vp, dev_t nvp_rdev)); -static void insmntque __P((struct vnode *vp, struct mount *mp)); -static void vclean __P((struct vnode *vp, int flags, struct proc *p)); - -/* - * Number of vnodes in existence. Increased whenever getnewvnode() - * allocates a new vnode, never decreased. - */ -static unsigned long numvnodes; -SYSCTL_LONG(_debug, OID_AUTO, numvnodes, CTLFLAG_RD, &numvnodes, 0, ""); - -/* - * Conversion tables for conversion from vnode types to inode formats - * and back. - */ -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, -}; - -/* - * List of vnodes that are ready for recycling. - */ -static TAILQ_HEAD(freelst, vnode) vnode_free_list; - -/* - * Minimum number of free vnodes. If there are fewer than this free vnodes, - * getnewvnode() will return a newly allocated vnode. - */ -static u_long wantfreevnodes = 25; -SYSCTL_LONG(_debug, OID_AUTO, wantfreevnodes, CTLFLAG_RW, &wantfreevnodes, 0, ""); -/* Number of vnodes in the free list. */ -static u_long freevnodes = 0; -SYSCTL_LONG(_debug, OID_AUTO, freevnodes, CTLFLAG_RD, &freevnodes, 0, ""); -/* Number of vnode allocation. */ -static u_long vnodeallocs = 0; -SYSCTL_LONG(_debug, OID_AUTO, vnodeallocs, CTLFLAG_RD, &vnodeallocs, 0, ""); -/* Period of vnode recycle from namecache in vnode allocation times. */ -static u_long vnoderecycleperiod = 1000; -SYSCTL_LONG(_debug, OID_AUTO, vnoderecycleperiod, CTLFLAG_RW, &vnoderecycleperiod, 0, ""); -/* Minimum number of total vnodes required to invoke vnode recycle from namecache. */ -static u_long vnoderecyclemintotalvn = 2000; -SYSCTL_LONG(_debug, OID_AUTO, vnoderecyclemintotalvn, CTLFLAG_RW, &vnoderecyclemintotalvn, 0, ""); -/* Minimum number of free vnodes required to invoke vnode recycle from namecache. */ -static u_long vnoderecycleminfreevn = 2000; -SYSCTL_LONG(_debug, OID_AUTO, vnoderecycleminfreevn, CTLFLAG_RW, &vnoderecycleminfreevn, 0, ""); -/* Number of vnodes attempted to recycle at a time. */ -static u_long vnoderecyclenumber = 3000; -SYSCTL_LONG(_debug, OID_AUTO, vnoderecyclenumber, CTLFLAG_RW, &vnoderecyclenumber, 0, ""); - -/* - * Various variables used for debugging the new implementation of - * reassignbuf(). - * XXX these are probably of (very) limited utility now. - */ -static int reassignbufcalls; -SYSCTL_INT(_vfs, OID_AUTO, reassignbufcalls, CTLFLAG_RW, &reassignbufcalls, 0, ""); -static int reassignbufloops; -SYSCTL_INT(_vfs, OID_AUTO, reassignbufloops, CTLFLAG_RW, &reassignbufloops, 0, ""); -static int reassignbufsortgood; -SYSCTL_INT(_vfs, OID_AUTO, reassignbufsortgood, CTLFLAG_RW, &reassignbufsortgood, 0, ""); -static int reassignbufsortbad; -SYSCTL_INT(_vfs, OID_AUTO, reassignbufsortbad, CTLFLAG_RW, &reassignbufsortbad, 0, ""); -/* Set to 0 for old insertion-sort based reassignbuf, 1 for modern method. */ -static int reassignbufmethod = 1; -SYSCTL_INT(_vfs, OID_AUTO, reassignbufmethod, CTLFLAG_RW, &reassignbufmethod, 0, ""); - -#ifdef ENABLE_VFS_IOOPT -/* See NOTES for a description of this setting. */ -int vfs_ioopt = 0; -SYSCTL_INT(_vfs, OID_AUTO, ioopt, CTLFLAG_RW, &vfs_ioopt, 0, ""); -#endif - -/* List of mounted filesystems. */ -struct mntlist mountlist = TAILQ_HEAD_INITIALIZER(mountlist); - -/* For any iteration/modification of mountlist */ -struct mtx mountlist_mtx; - -/* For any iteration/modification of mnt_vnodelist */ -struct mtx mntvnode_mtx; - -/* - * Cache for the mount type id assigned to NFS. This is used for - * special checks in nfs/nfs_nqlease.c and vm/vnode_pager.c. - */ -int nfs_mount_type = -1; - -/* To keep more than one thread at a time from running vfs_getnewfsid */ -static struct mtx mntid_mtx; - -/* For any iteration/modification of vnode_free_list */ -static struct mtx vnode_free_list_mtx; - -/* - * For any iteration/modification of dev->si_hlist (linked through - * v_specnext) - */ -static struct mtx spechash_mtx; - -/* Publicly exported FS */ -struct nfs_public nfs_pub; - -/* Zone for allocation of new vnodes - used exclusively by getnewvnode() */ -static vm_zone_t vnode_zone; - -/* Set to 1 to print out reclaim of active vnodes */ -int prtactive = 0; - -/* - * The workitem queue. - * - * It is useful to delay writes of file data and filesystem metadata - * for tens of seconds so that quickly created and deleted files need - * not waste disk bandwidth being created and removed. To realize this, - * we append vnodes to a "workitem" queue. When running with a soft - * updates implementation, most pending metadata dependencies should - * not wait for more than a few seconds. Thus, mounted on block devices - * are delayed only about a half the time that file data is delayed. - * Similarly, directory updates are more critical, so are only delayed - * about a third the time that file data is delayed. Thus, there are - * SYNCER_MAXDELAY queues that are processed round-robin at a rate of - * one each second (driven off the filesystem syncer process). The - * syncer_delayno variable indicates the next queue that is to be processed. - * Items that need to be processed soon are placed in this queue: - * - * syncer_workitem_pending[syncer_delayno] - * - * A delay of fifteen seconds is done by placing the request fifteen - * entries later in the queue: - * - * syncer_workitem_pending[(syncer_delayno + 15) & syncer_mask] - * - */ -static int syncer_delayno = 0; -static long syncer_mask; -LIST_HEAD(synclist, vnode); -static struct synclist *syncer_workitem_pending; - -#define SYNCER_MAXDELAY 32 -static int syncer_maxdelay = SYNCER_MAXDELAY; /* maximum delay time */ -time_t syncdelay = 30; /* max time to delay syncing data */ -time_t filedelay = 30; /* time to delay syncing files */ -SYSCTL_INT(_kern, OID_AUTO, filedelay, CTLFLAG_RW, &filedelay, 0, ""); -time_t dirdelay = 29; /* time to delay syncing directories */ -SYSCTL_INT(_kern, OID_AUTO, dirdelay, CTLFLAG_RW, &dirdelay, 0, ""); -time_t metadelay = 28; /* time to delay syncing metadata */ -SYSCTL_INT(_kern, OID_AUTO, metadelay, CTLFLAG_RW, &metadelay, 0, ""); -static int rushjob; /* number of slots to run ASAP */ -static int stat_rush_requests; /* number of times I/O speeded up */ -SYSCTL_INT(_debug, OID_AUTO, rush_requests, CTLFLAG_RW, &stat_rush_requests, 0, ""); - -/* - * Number of vnodes we want to exist at any one time. This is mostly used - * to size hash tables in vnode-related code. It is normally not used in - * getnewvnode(), as wantfreevnodes is normally nonzero.) - * - * XXX desiredvnodes is historical cruft and should not exist. - */ -int desiredvnodes; -SYSCTL_INT(_kern, KERN_MAXVNODES, maxvnodes, CTLFLAG_RW, - &desiredvnodes, 0, "Maximum number of vnodes"); - static void vfs_free_addrlist __P((struct netexport *nep)); static int vfs_free_netcred __P((struct radix_node *rn, void *w)); static int vfs_hang_addrlist __P((struct mount *mp, struct netexport *nep, @@ -276,2073 +75,6 @@ struct netexport { }; /* - * Initialize the vnode management data structures. - */ -static void -vntblinit(void *dummy __unused) -{ - - desiredvnodes = maxproc + cnt.v_page_count / 4; - mtx_init(&mountlist_mtx, "mountlist", MTX_DEF); - mtx_init(&mntvnode_mtx, "mntvnode", MTX_DEF); - mtx_init(&mntid_mtx, "mntid", MTX_DEF); - mtx_init(&spechash_mtx, "spechash", MTX_DEF); - TAILQ_INIT(&vnode_free_list); - mtx_init(&vnode_free_list_mtx, "vnode_free_list", MTX_DEF); - vnode_zone = zinit("VNODE", sizeof (struct vnode), 0, 0, 5); - /* - * Initialize the filesystem syncer. - */ - syncer_workitem_pending = hashinit(syncer_maxdelay, M_VNODE, - &syncer_mask); - syncer_maxdelay = syncer_mask + 1; -} -SYSINIT(vfs, SI_SUB_VFS, SI_ORDER_FIRST, vntblinit, NULL) - - -/* - * Mark a mount point as busy. Used to synchronize access and to delay - * unmounting. Interlock is not released on failure. - */ -int -vfs_busy(mp, flags, interlkp, p) - struct mount *mp; - int flags; - struct mtx *interlkp; - struct proc *p; -{ - int lkflags; - - if (mp->mnt_kern_flag & MNTK_UNMOUNT) { - if (flags & LK_NOWAIT) - return (ENOENT); - mp->mnt_kern_flag |= MNTK_MWAIT; - /* - * Since all busy locks are shared except the exclusive - * lock granted when unmounting, the only place that a - * wakeup needs to be done is at the release of the - * exclusive lock at the end of dounmount. - */ - msleep((caddr_t)mp, interlkp, PVFS, "vfs_busy", 0); - return (ENOENT); - } - lkflags = LK_SHARED | LK_NOPAUSE; - if (interlkp) - lkflags |= LK_INTERLOCK; - if (lockmgr(&mp->mnt_lock, lkflags, interlkp, p)) - panic("vfs_busy: unexpected lock failure"); - return (0); -} - -/* - * Free a busy filesystem. - */ -void -vfs_unbusy(mp, p) - struct mount *mp; - struct proc *p; -{ - - lockmgr(&mp->mnt_lock, LK_RELEASE, NULL, p); -} - -/* - * 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(fstypename, devname, mpp) - char *fstypename; - char *devname; - struct mount **mpp; -{ - struct proc *p = curproc; /* XXX */ - struct vfsconf *vfsp; - struct mount *mp; - - if (fstypename == NULL) - return (ENODEV); - for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) - if (!strcmp(vfsp->vfc_name, fstypename)) - break; - if (vfsp == NULL) - return (ENODEV); - mp = malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK | M_ZERO); - lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, LK_NOPAUSE); - (void)vfs_busy(mp, LK_NOWAIT, 0, p); - LIST_INIT(&mp->mnt_vnodelist); - mp->mnt_vfc = vfsp; - mp->mnt_op = vfsp->vfc_vfsops; - mp->mnt_flag = MNT_RDONLY; - mp->mnt_vnodecovered = NULLVP; - vfsp->vfc_refcount++; - mp->mnt_iosize_max = DFLTPHYS; - mp->mnt_stat.f_type = vfsp->vfc_typenum; - mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK; - strncpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); - mp->mnt_stat.f_mntonname[0] = '/'; - mp->mnt_stat.f_mntonname[1] = 0; - (void) copystr(devname, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 0); - *mpp = mp; - return (0); -} - -/* - * Find an appropriate filesystem to use for the root. If a filesystem - * has not been preselected, walk through the list of known filesystems - * trying those that have mountroot routines, and try them until one - * works or we have tried them all. - */ -#ifdef notdef /* XXX JH */ -int -lite2_vfs_mountroot() -{ - struct vfsconf *vfsp; - extern int (*lite2_mountroot) __P((void)); - int error; - - if (lite2_mountroot != NULL) - return ((*lite2_mountroot)()); - for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) { - if (vfsp->vfc_mountroot == NULL) - continue; - if ((error = (*vfsp->vfc_mountroot)()) == 0) - return (0); - printf("%s_mountroot failed: %d\n", vfsp->vfc_name, error); - } - return (ENODEV); -} -#endif - -/* - * Lookup a mount point by filesystem identifier. - */ -struct mount * -vfs_getvfs(fsid) - fsid_t *fsid; -{ - register struct mount *mp; - - mtx_lock(&mountlist_mtx); - 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]) { - mtx_unlock(&mountlist_mtx); - return (mp); - } - } - mtx_unlock(&mountlist_mtx); - return ((struct mount *) 0); -} - -/* - * Get a new unique fsid. Try to make its val[0] unique, since this value - * will be used to create fake device numbers for stat(). Also try (but - * not so hard) make its val[0] unique mod 2^16, since some emulators only - * support 16-bit device numbers. We end up with unique val[0]'s for the - * first 2^16 calls and unique val[0]'s mod 2^16 for the first 2^8 calls. - * - * Keep in mind that several mounts may be running in parallel. Starting - * the search one past where the previous search terminated is both a - * micro-optimization and a defense against returning the same fsid to - * different mounts. - */ -void -vfs_getnewfsid(mp) - struct mount *mp; -{ - static u_int16_t mntid_base; - fsid_t tfsid; - int mtype; - - mtx_lock(&mntid_mtx); - mtype = mp->mnt_vfc->vfc_typenum; - tfsid.val[1] = mtype; - mtype = (mtype & 0xFF) << 24; - for (;;) { - tfsid.val[0] = makeudev(255, - mtype | ((mntid_base & 0xFF00) << 8) | (mntid_base & 0xFF)); - mntid_base++; - if (vfs_getvfs(&tfsid) == NULL) - break; - } - mp->mnt_stat.f_fsid.val[0] = tfsid.val[0]; - mp->mnt_stat.f_fsid.val[1] = tfsid.val[1]; - mtx_unlock(&mntid_mtx); -} - -/* - * Knob to control the precision of file timestamps: - * - * 0 = seconds only; nanoseconds zeroed. - * 1 = seconds and nanoseconds, accurate within 1/HZ. - * 2 = seconds and nanoseconds, truncated to microseconds. - * >=3 = seconds and nanoseconds, maximum precision. - */ -enum { TSP_SEC, TSP_HZ, TSP_USEC, TSP_NSEC }; - -static int timestamp_precision = TSP_SEC; -SYSCTL_INT(_vfs, OID_AUTO, timestamp_precision, CTLFLAG_RW, - ×tamp_precision, 0, ""); - -/* - * Get a current timestamp. - */ -void -vfs_timestamp(tsp) - struct timespec *tsp; -{ - struct timeval tv; - - switch (timestamp_precision) { - case TSP_SEC: - tsp->tv_sec = time_second; - tsp->tv_nsec = 0; - break; - case TSP_HZ: - getnanotime(tsp); - break; - case TSP_USEC: - microtime(&tv); - TIMEVAL_TO_TIMESPEC(&tv, tsp); - break; - case TSP_NSEC: - default: - nanotime(tsp); - break; - } -} - -/* - * Set vnode attributes to VNOVAL - */ -void -vattr_null(vap) - register struct vattr *vap; -{ - - vap->va_type = VNON; - vap->va_size = VNOVAL; - vap->va_bytes = VNOVAL; - 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_blocksize = VNOVAL; - vap->va_rdev = 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_flags = VNOVAL; - vap->va_gen = VNOVAL; - vap->va_vaflags = 0; -} - -/* - * Routines having to do with the management of the vnode table. - */ - -/* - * Return the next vnode from the free list. - */ -int -getnewvnode(tag, mp, vops, vpp) - enum vtagtype tag; - struct mount *mp; - vop_t **vops; - struct vnode **vpp; -{ - int s, count; - struct proc *p = curproc; /* XXX */ - struct vnode *vp = NULL; - struct mount *vnmp; - vm_object_t object; - - /* - * We take the least recently used vnode from the freelist - * if we can get it and it has no cached pages, and no - * namecache entries are relative to it. - * Otherwise we allocate a new vnode - */ - - s = splbio(); - mtx_lock(&vnode_free_list_mtx); - - if (wantfreevnodes && freevnodes < wantfreevnodes) { - vp = NULL; - } else if (!wantfreevnodes && freevnodes <= desiredvnodes) { - /* - * XXX: this is only here to be backwards compatible - */ - vp = NULL; - } else for (count = 0; count < freevnodes; count++) { - vp = TAILQ_FIRST(&vnode_free_list); - if (vp == NULL || vp->v_usecount) - panic("getnewvnode: free vnode isn't"); - TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); - - /* - * Don't recycle if active in the namecache or - * if it still has cached pages or we cannot get - * its interlock. - */ - if (LIST_FIRST(&vp->v_cache_src) != NULL || - (VOP_GETVOBJECT(vp, &object) == 0 && - (object->resident_page_count || object->ref_count)) || - !mtx_trylock(&vp->v_interlock)) { - TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist); - vp = NULL; - continue; - } - /* - * Skip over it if its filesystem is being suspended. - */ - if (vn_start_write(vp, &vnmp, V_NOWAIT) == 0) - break; - mtx_unlock(&vp->v_interlock); - TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist); - vp = NULL; - } - if (vp) { - vp->v_flag |= VDOOMED; - vp->v_flag &= ~VFREE; - freevnodes--; - mtx_unlock(&vnode_free_list_mtx); - cache_purge(vp); - vp->v_lease = NULL; - if (vp->v_type != VBAD) { - vgonel(vp, p); - } else { - mtx_unlock(&vp->v_interlock); - } - vn_finished_write(vnmp); - -#ifdef INVARIANTS - { - int s; - - if (vp->v_data) - panic("cleaned vnode isn't"); - s = splbio(); - if (vp->v_numoutput) - panic("Clean vnode has pending I/O's"); - splx(s); - if (vp->v_writecount != 0) - panic("Non-zero write count"); - } -#endif - vp->v_flag = 0; - vp->v_lastw = 0; - vp->v_lasta = 0; - vp->v_cstart = 0; - vp->v_clen = 0; - vp->v_socket = 0; - } else { - mtx_unlock(&vnode_free_list_mtx); - vp = (struct vnode *) zalloc(vnode_zone); - bzero((char *) vp, sizeof *vp); - mtx_init(&vp->v_interlock, "vnode interlock", MTX_DEF); - vp->v_dd = vp; - mtx_init(&vp->v_pollinfo.vpi_lock, "vnode pollinfo", MTX_DEF); - cache_purge(vp); - LIST_INIT(&vp->v_cache_src); - TAILQ_INIT(&vp->v_cache_dst); - numvnodes++; - } - - TAILQ_INIT(&vp->v_cleanblkhd); - TAILQ_INIT(&vp->v_dirtyblkhd); - vp->v_type = VNON; - vp->v_tag = tag; - vp->v_op = vops; - lockinit(&vp->v_lock, PVFS, "vnlock", 0, LK_NOPAUSE); - insmntque(vp, mp); - *vpp = vp; - vp->v_usecount = 1; - vp->v_data = 0; - - splx(s); - - vfs_object_create(vp, p, p->p_ucred); - - vnodeallocs++; - if (vnodeallocs % vnoderecycleperiod == 0 && - freevnodes < vnoderecycleminfreevn && - vnoderecyclemintotalvn < numvnodes) { - /* Recycle vnodes. */ - cache_purgeleafdirs(vnoderecyclenumber); - } - - return (0); -} - -/* - * Move a vnode from one mount queue to another. - */ -static void -insmntque(vp, mp) - register struct vnode *vp; - register struct mount *mp; -{ - - mtx_lock(&mntvnode_mtx); - /* - * Delete from old mount point vnode list, if on one. - */ - if (vp->v_mount != NULL) - LIST_REMOVE(vp, v_mntvnodes); - /* - * Insert into list of vnodes for the new mount point, if available. - */ - if ((vp->v_mount = mp) == NULL) { - mtx_unlock(&mntvnode_mtx); - return; - } - LIST_INSERT_HEAD(&mp->mnt_vnodelist, vp, v_mntvnodes); - mtx_unlock(&mntvnode_mtx); -} - -/* - * Update outstanding I/O count and do wakeup if requested. - */ -void -vwakeup(bp) - register struct buf *bp; -{ - register struct vnode *vp; - - bp->b_flags &= ~B_WRITEINPROG; - if ((vp = bp->b_vp)) { - vp->v_numoutput--; - if (vp->v_numoutput < 0) - panic("vwakeup: neg numoutput"); - if ((vp->v_numoutput == 0) && (vp->v_flag & VBWAIT)) { - vp->v_flag &= ~VBWAIT; - wakeup((caddr_t) &vp->v_numoutput); - } - } -} - -/* - * Flush out and invalidate all buffers associated with a vnode. - * Called with the underlying object locked. - */ -int -vinvalbuf(vp, flags, cred, p, slpflag, slptimeo) - register struct vnode *vp; - int flags; - struct ucred *cred; - struct proc *p; - int slpflag, slptimeo; -{ - register struct buf *bp; - struct buf *nbp, *blist; - int s, error; - vm_object_t object; - - if (flags & V_SAVE) { - s = splbio(); - while (vp->v_numoutput) { - vp->v_flag |= VBWAIT; - error = tsleep((caddr_t)&vp->v_numoutput, - slpflag | (PRIBIO + 1), "vinvlbuf", slptimeo); - if (error) { - splx(s); - return (error); - } - } - if (!TAILQ_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 || - !TAILQ_EMPTY(&vp->v_dirtyblkhd)) - panic("vinvalbuf: dirty bufs"); - } - splx(s); - } - s = splbio(); - for (;;) { - blist = TAILQ_FIRST(&vp->v_cleanblkhd); - if (!blist) - blist = TAILQ_FIRST(&vp->v_dirtyblkhd); - if (!blist) - break; - - for (bp = blist; bp; bp = nbp) { - nbp = TAILQ_NEXT(bp, b_vnbufs); - if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) { - error = BUF_TIMELOCK(bp, - LK_EXCLUSIVE | LK_SLEEPFAIL, - "vinvalbuf", slpflag, slptimeo); - if (error == ENOLCK) - break; - splx(s); - return (error); - } - /* - * 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. Note that vfs_bio_awrite expects - * buffers to reside on a queue, while BUF_WRITE and - * brelse do not. - */ - if (((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI) && - (flags & V_SAVE)) { - - if (bp->b_vp == vp) { - if (bp->b_flags & B_CLUSTEROK) { - BUF_UNLOCK(bp); - vfs_bio_awrite(bp); - } else { - bremfree(bp); - bp->b_flags |= B_ASYNC; - BUF_WRITE(bp); - } - } else { - bremfree(bp); - (void) BUF_WRITE(bp); - } - break; - } - bremfree(bp); - bp->b_flags |= (B_INVAL | B_NOCACHE | B_RELBUF); - bp->b_flags &= ~B_ASYNC; - brelse(bp); - } - } - - while (vp->v_numoutput > 0) { - vp->v_flag |= VBWAIT; - tsleep(&vp->v_numoutput, PVM, "vnvlbv", 0); - } - - splx(s); - - /* - * Destroy the copy in the VM cache, too. - */ - mtx_lock(&vp->v_interlock); - if (VOP_GETVOBJECT(vp, &object) == 0) { - vm_object_page_remove(object, 0, 0, - (flags & V_SAVE) ? TRUE : FALSE); - } - mtx_unlock(&vp->v_interlock); - - if (!TAILQ_EMPTY(&vp->v_dirtyblkhd) || !TAILQ_EMPTY(&vp->v_cleanblkhd)) - panic("vinvalbuf: flush failed"); - return (0); -} - -/* - * Truncate a file's buffer and pages to a specified length. This - * is in lieu of the old vinvalbuf mechanism, which performed unneeded - * sync activity. - */ -int -vtruncbuf(vp, cred, p, length, blksize) - register struct vnode *vp; - struct ucred *cred; - struct proc *p; - off_t length; - int blksize; -{ - register struct buf *bp; - struct buf *nbp; - int s, anyfreed; - int trunclbn; - - /* - * Round up to the *next* lbn. - */ - trunclbn = (length + blksize - 1) / blksize; - - s = splbio(); -restart: - anyfreed = 1; - for (;anyfreed;) { - anyfreed = 0; - for (bp = TAILQ_FIRST(&vp->v_cleanblkhd); bp; bp = nbp) { - nbp = TAILQ_NEXT(bp, b_vnbufs); - if (bp->b_lblkno >= trunclbn) { - if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) { - BUF_LOCK(bp, LK_EXCLUSIVE|LK_SLEEPFAIL); - goto restart; - } else { - bremfree(bp); - bp->b_flags |= (B_INVAL | B_RELBUF); - bp->b_flags &= ~B_ASYNC; - brelse(bp); - anyfreed = 1; - } - if (nbp && - (((nbp->b_xflags & BX_VNCLEAN) == 0) || - (nbp->b_vp != vp) || - (nbp->b_flags & B_DELWRI))) { - goto restart; - } - } - } - - for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { - nbp = TAILQ_NEXT(bp, b_vnbufs); - if (bp->b_lblkno >= trunclbn) { - if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) { - BUF_LOCK(bp, LK_EXCLUSIVE|LK_SLEEPFAIL); - goto restart; - } else { - bremfree(bp); - bp->b_flags |= (B_INVAL | B_RELBUF); - bp->b_flags &= ~B_ASYNC; - brelse(bp); - anyfreed = 1; - } - if (nbp && - (((nbp->b_xflags & BX_VNDIRTY) == 0) || - (nbp->b_vp != vp) || - (nbp->b_flags & B_DELWRI) == 0)) { - goto restart; - } - } - } - } - - if (length > 0) { -restartsync: - for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { - nbp = TAILQ_NEXT(bp, b_vnbufs); - if ((bp->b_flags & B_DELWRI) && (bp->b_lblkno < 0)) { - if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) { - BUF_LOCK(bp, LK_EXCLUSIVE|LK_SLEEPFAIL); - goto restart; - } else { - bremfree(bp); - if (bp->b_vp == vp) { - bp->b_flags |= B_ASYNC; - } else { - bp->b_flags &= ~B_ASYNC; - } - BUF_WRITE(bp); - } - goto restartsync; - } - - } - } - - while (vp->v_numoutput > 0) { - vp->v_flag |= VBWAIT; - tsleep(&vp->v_numoutput, PVM, "vbtrunc", 0); - } - - splx(s); - - vnode_pager_setsize(vp, length); - - return (0); -} - -/* - * Associate a buffer with a vnode. - */ -void -bgetvp(vp, bp) - register struct vnode *vp; - register struct buf *bp; -{ - int s; - - KASSERT(bp->b_vp == NULL, ("bgetvp: not free")); - - vhold(vp); - bp->b_vp = vp; - bp->b_dev = vn_todev(vp); - /* - * Insert onto list for new vnode. - */ - s = splbio(); - bp->b_xflags |= BX_VNCLEAN; - bp->b_xflags &= ~BX_VNDIRTY; - TAILQ_INSERT_TAIL(&vp->v_cleanblkhd, bp, b_vnbufs); - splx(s); -} - -/* - * Disassociate a buffer from a vnode. - */ -void -brelvp(bp) - register struct buf *bp; -{ - struct vnode *vp; - struct buflists *listheadp; - int s; - - KASSERT(bp->b_vp != NULL, ("brelvp: NULL")); - - /* - * Delete from old vnode list, if on one. - */ - vp = bp->b_vp; - s = splbio(); - if (bp->b_xflags & (BX_VNDIRTY | BX_VNCLEAN)) { - if (bp->b_xflags & BX_VNDIRTY) - listheadp = &vp->v_dirtyblkhd; - else - listheadp = &vp->v_cleanblkhd; - TAILQ_REMOVE(listheadp, bp, b_vnbufs); - bp->b_xflags &= ~(BX_VNDIRTY | BX_VNCLEAN); - } - if ((vp->v_flag & VONWORKLST) && TAILQ_EMPTY(&vp->v_dirtyblkhd)) { - vp->v_flag &= ~VONWORKLST; - LIST_REMOVE(vp, v_synclist); - } - splx(s); - bp->b_vp = (struct vnode *) 0; - vdrop(vp); -} - -/* - * Add an item to the syncer work queue. - */ -static void -vn_syncer_add_to_worklist(struct vnode *vp, int delay) -{ - int s, slot; - - s = splbio(); - - if (vp->v_flag & VONWORKLST) { - LIST_REMOVE(vp, v_synclist); - } - - if (delay > syncer_maxdelay - 2) - delay = syncer_maxdelay - 2; - slot = (syncer_delayno + delay) & syncer_mask; - - LIST_INSERT_HEAD(&syncer_workitem_pending[slot], vp, v_synclist); - vp->v_flag |= VONWORKLST; - splx(s); -} - -struct proc *updateproc; -static void sched_sync __P((void)); -static struct kproc_desc up_kp = { - "syncer", - sched_sync, - &updateproc -}; -SYSINIT(syncer, SI_SUB_KTHREAD_UPDATE, SI_ORDER_FIRST, kproc_start, &up_kp) - -/* - * System filesystem synchronizer daemon. - */ -void -sched_sync(void) -{ - struct synclist *slp; - struct vnode *vp; - struct mount *mp; - long starttime; - int s; - struct proc *p = updateproc; - - mtx_lock(&Giant); - - EVENTHANDLER_REGISTER(shutdown_pre_sync, kproc_shutdown, p, - SHUTDOWN_PRI_LAST); - - for (;;) { - kthread_suspend_check(p); - - starttime = time_second; - - /* - * Push files whose dirty time has expired. Be careful - * of interrupt race on slp queue. - */ - s = splbio(); - slp = &syncer_workitem_pending[syncer_delayno]; - syncer_delayno += 1; - if (syncer_delayno == syncer_maxdelay) - syncer_delayno = 0; - splx(s); - - while ((vp = LIST_FIRST(slp)) != NULL) { - if (VOP_ISLOCKED(vp, NULL) == 0 && - vn_start_write(vp, &mp, V_NOWAIT) == 0) { - vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); - (void) VOP_FSYNC(vp, p->p_ucred, MNT_LAZY, p); - VOP_UNLOCK(vp, 0, p); - vn_finished_write(mp); - } - s = splbio(); - if (LIST_FIRST(slp) == vp) { - /* - * Note: v_tag VT_VFS vps can remain on the - * worklist too with no dirty blocks, but - * since sync_fsync() moves it to a different - * slot we are safe. - */ - if (TAILQ_EMPTY(&vp->v_dirtyblkhd) && - !vn_isdisk(vp, NULL)) - panic("sched_sync: fsync failed vp %p tag %d", vp, vp->v_tag); - /* - * Put us back on the worklist. The worklist - * routine will remove us from our current - * position and then add us back in at a later - * position. - */ - vn_syncer_add_to_worklist(vp, syncdelay); - } - splx(s); - } - - /* - * Do soft update processing. - */ -#ifdef SOFTUPDATES - softdep_process_worklist(NULL); -#endif - - /* - * The variable rushjob allows the kernel to speed up the - * processing of the filesystem syncer process. A rushjob - * value of N tells the filesystem syncer to process the next - * N seconds worth of work on its queue ASAP. Currently rushjob - * is used by the soft update code to speed up the filesystem - * syncer process when the incore state is getting so far - * ahead of the disk that the kernel memory pool is being - * threatened with exhaustion. - */ - if (rushjob > 0) { - rushjob -= 1; - continue; - } - /* - * If it has taken us less than a second to process the - * current work, then wait. Otherwise start right over - * again. We can still lose time if any single round - * takes more than two seconds, but it does not really - * matter as we are just trying to generally pace the - * filesystem activity. - */ - if (time_second == starttime) - tsleep(&lbolt, PPAUSE, "syncer", 0); - } -} - -/* - * Request the syncer daemon to speed up its work. - * We never push it to speed up more than half of its - * normal turn time, otherwise it could take over the cpu. - */ -int -speedup_syncer() -{ - - mtx_lock_spin(&sched_lock); - if (updateproc->p_wchan == &lbolt) - setrunnable(updateproc); - mtx_unlock_spin(&sched_lock); - if (rushjob < syncdelay / 2) { - rushjob += 1; - stat_rush_requests += 1; - return (1); - } - return(0); -} - -/* - * Associate a p-buffer with a vnode. - * - * Also sets B_PAGING flag to indicate that vnode is not fully associated - * with the buffer. i.e. the bp has not been linked into the vnode or - * ref-counted. - */ -void -pbgetvp(vp, bp) - register struct vnode *vp; - register struct buf *bp; -{ - - KASSERT(bp->b_vp == NULL, ("pbgetvp: not free")); - - bp->b_vp = vp; - bp->b_flags |= B_PAGING; - bp->b_dev = vn_todev(vp); -} - -/* - * Disassociate a p-buffer from a vnode. - */ -void -pbrelvp(bp) - register struct buf *bp; -{ - - KASSERT(bp->b_vp != NULL, ("pbrelvp: NULL")); - - /* XXX REMOVE ME */ - if (TAILQ_NEXT(bp, b_vnbufs) != NULL) { - panic( - "relpbuf(): b_vp was probably reassignbuf()d %p %x", - bp, - (int)bp->b_flags - ); - } - bp->b_vp = (struct vnode *) 0; - bp->b_flags &= ~B_PAGING; -} - -/* - * Change the vnode a pager buffer is associated with. - */ -void -pbreassignbuf(bp, newvp) - struct buf *bp; - struct vnode *newvp; -{ - - KASSERT(bp->b_flags & B_PAGING, - ("pbreassignbuf() on non phys bp %p", bp)); - bp->b_vp = newvp; -} - -/* - * Reassign a buffer from one vnode to another. - * Used to assign file specific control information - * (indirect blocks) to the vnode to which they belong. - */ -void -reassignbuf(bp, newvp) - register struct buf *bp; - register struct vnode *newvp; -{ - struct buflists *listheadp; - int delay; - int s; - - if (newvp == NULL) { - printf("reassignbuf: NULL"); - return; - } - ++reassignbufcalls; - - /* - * B_PAGING flagged buffers cannot be reassigned because their vp - * is not fully linked in. - */ - if (bp->b_flags & B_PAGING) - panic("cannot reassign paging buffer"); - - s = splbio(); - /* - * Delete from old vnode list, if on one. - */ - if (bp->b_xflags & (BX_VNDIRTY | BX_VNCLEAN)) { - if (bp->b_xflags & BX_VNDIRTY) - listheadp = &bp->b_vp->v_dirtyblkhd; - else - listheadp = &bp->b_vp->v_cleanblkhd; - TAILQ_REMOVE(listheadp, bp, b_vnbufs); - bp->b_xflags &= ~(BX_VNDIRTY | BX_VNCLEAN); - if (bp->b_vp != newvp) { - vdrop(bp->b_vp); - bp->b_vp = NULL; /* for clarification */ - } - } - /* - * If dirty, put on list of dirty buffers; otherwise insert onto list - * of clean buffers. - */ - if (bp->b_flags & B_DELWRI) { - struct buf *tbp; - - listheadp = &newvp->v_dirtyblkhd; - if ((newvp->v_flag & VONWORKLST) == 0) { - switch (newvp->v_type) { - case VDIR: - delay = dirdelay; - break; - case VCHR: - if (newvp->v_rdev->si_mountpoint != NULL) { - delay = metadelay; - break; - } - /* fall through */ - default: - delay = filedelay; - } - vn_syncer_add_to_worklist(newvp, delay); - } - bp->b_xflags |= BX_VNDIRTY; - tbp = TAILQ_FIRST(listheadp); - if (tbp == NULL || - bp->b_lblkno == 0 || - (bp->b_lblkno > 0 && tbp->b_lblkno < 0) || - (bp->b_lblkno > 0 && bp->b_lblkno < tbp->b_lblkno)) { - TAILQ_INSERT_HEAD(listheadp, bp, b_vnbufs); - ++reassignbufsortgood; - } else if (bp->b_lblkno < 0) { - TAILQ_INSERT_TAIL(listheadp, bp, b_vnbufs); - ++reassignbufsortgood; - } else if (reassignbufmethod == 1) { - /* - * New sorting algorithm, only handle sequential case, - * otherwise append to end (but before metadata) - */ - if ((tbp = gbincore(newvp, bp->b_lblkno - 1)) != NULL && - (tbp->b_xflags & BX_VNDIRTY)) { - /* - * Found the best place to insert the buffer - */ - TAILQ_INSERT_AFTER(listheadp, tbp, bp, b_vnbufs); - ++reassignbufsortgood; - } else { - /* - * Missed, append to end, but before meta-data. - * We know that the head buffer in the list is - * not meta-data due to prior conditionals. - * - * Indirect effects: NFS second stage write - * tends to wind up here, giving maximum - * distance between the unstable write and the - * commit rpc. - */ - tbp = TAILQ_LAST(listheadp, buflists); - while (tbp && tbp->b_lblkno < 0) - tbp = TAILQ_PREV(tbp, buflists, b_vnbufs); - TAILQ_INSERT_AFTER(listheadp, tbp, bp, b_vnbufs); - ++reassignbufsortbad; - } - } else { - /* - * Old sorting algorithm, scan queue and insert - */ - struct buf *ttbp; - while ((ttbp = TAILQ_NEXT(tbp, b_vnbufs)) && - (ttbp->b_lblkno < bp->b_lblkno)) { - ++reassignbufloops; - tbp = ttbp; - } - TAILQ_INSERT_AFTER(listheadp, tbp, bp, b_vnbufs); - } - } else { - bp->b_xflags |= BX_VNCLEAN; - TAILQ_INSERT_TAIL(&newvp->v_cleanblkhd, bp, b_vnbufs); - if ((newvp->v_flag & VONWORKLST) && - TAILQ_EMPTY(&newvp->v_dirtyblkhd)) { - newvp->v_flag &= ~VONWORKLST; - LIST_REMOVE(newvp, v_synclist); - } - } - if (bp->b_vp != newvp) { - bp->b_vp = newvp; - vhold(bp->b_vp); - } - splx(s); -} - -/* - * Create a vnode for a device. - * Used for mounting the root file system. - */ -int -bdevvp(dev, vpp) - dev_t dev; - struct vnode **vpp; -{ - register struct vnode *vp; - struct vnode *nvp; - int error; - - if (dev == NODEV) { - *vpp = NULLVP; - return (ENXIO); - } - if (vfinddev(dev, VCHR, vpp)) - return (0); - error = getnewvnode(VT_NON, (struct mount *)0, spec_vnodeop_p, &nvp); - if (error) { - *vpp = NULLVP; - return (error); - } - vp = nvp; - vp->v_type = VCHR; - addalias(vp, dev); - *vpp = vp; - return (0); -} - -/* - * Add vnode to the alias list hung off the dev_t. - * - * The reason for this gunk is that multiple vnodes can reference - * the same physical device, so checking vp->v_usecount to see - * how many users there are is inadequate; the v_usecount for - * the vnodes need to be accumulated. vcount() does that. - */ -struct vnode * -addaliasu(nvp, nvp_rdev) - struct vnode *nvp; - udev_t nvp_rdev; -{ - struct vnode *ovp; - vop_t **ops; - dev_t dev; - - if (nvp->v_type == VBLK) - return (nvp); - if (nvp->v_type != VCHR) - panic("addaliasu on non-special vnode"); - dev = udev2dev(nvp_rdev, 0); - /* - * Check to see if we have a bdevvp vnode with no associated - * filesystem. If so, we want to associate the filesystem of - * the new newly instigated vnode with the bdevvp vnode and - * discard the newly created vnode rather than leaving the - * bdevvp vnode lying around with no associated filesystem. - */ - if (vfinddev(dev, nvp->v_type, &ovp) == 0 || ovp->v_data != NULL) { - addalias(nvp, dev); - return (nvp); - } - /* - * Discard unneeded vnode, but save its node specific data. - * Note that if there is a lock, it is carried over in the - * node specific data to the replacement vnode. - */ - vref(ovp); - ovp->v_data = nvp->v_data; - ovp->v_tag = nvp->v_tag; - nvp->v_data = NULL; - lockinit(&ovp->v_lock, PVFS, nvp->v_lock.lk_wmesg, - nvp->v_lock.lk_timo, nvp->v_lock.lk_flags & LK_EXTFLG_MASK); - if (nvp->v_vnlock) - ovp->v_vnlock = &ovp->v_lock; - ops = ovp->v_op; - ovp->v_op = nvp->v_op; - if (VOP_ISLOCKED(nvp, curproc)) { - VOP_UNLOCK(nvp, 0, curproc); - vn_lock(ovp, LK_EXCLUSIVE | LK_RETRY, curproc); - } - nvp->v_op = ops; - insmntque(ovp, nvp->v_mount); - vrele(nvp); - vgone(nvp); - return (ovp); -} - -/* This is a local helper function that do the same as addaliasu, but for a - * dev_t instead of an udev_t. */ -static void -addalias(nvp, dev) - struct vnode *nvp; - dev_t dev; -{ - - KASSERT(nvp->v_type == VCHR, ("addalias on non-special vnode")); - nvp->v_rdev = dev; - mtx_lock(&spechash_mtx); - SLIST_INSERT_HEAD(&dev->si_hlist, nvp, v_specnext); - mtx_unlock(&spechash_mtx); -} - -/* - * Grab a particular vnode from the free list, increment its - * reference count and lock it. The vnode lock bit is set if the - * vnode is being eliminated in vgone. The process is awakened - * when the transition is completed, and an error returned to - * indicate that the vnode is no longer usable (possibly having - * been changed to a new file system type). - */ -int -vget(vp, flags, p) - register struct vnode *vp; - int flags; - struct proc *p; -{ - int error; - - /* - * 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. - */ - if ((flags & LK_INTERLOCK) == 0) - mtx_lock(&vp->v_interlock); - if (vp->v_flag & VXLOCK) { - if (vp->v_vxproc == curproc) { - printf("VXLOCK interlock avoided\n"); - } else { - vp->v_flag |= VXWANT; - msleep((caddr_t)vp, &vp->v_interlock, PINOD | PDROP, - "vget", 0); - return (ENOENT); - } - } - - vp->v_usecount++; - - if (VSHOULDBUSY(vp)) - vbusy(vp); - if (flags & LK_TYPE_MASK) { - if ((error = vn_lock(vp, flags | LK_INTERLOCK, p)) != 0) { - /* - * must expand vrele here because we do not want - * to call VOP_INACTIVE if the reference count - * drops back to zero since it was never really - * active. We must remove it from the free list - * before sleeping so that multiple processes do - * not try to recycle it. - */ - mtx_lock(&vp->v_interlock); - vp->v_usecount--; - if (VSHOULDFREE(vp)) - vfree(vp); - mtx_unlock(&vp->v_interlock); - } - return (error); - } - mtx_unlock(&vp->v_interlock); - return (0); -} - -/* - * Increase the reference count of a vnode. - */ -void -vref(struct vnode *vp) -{ - mtx_lock(&vp->v_interlock); - vp->v_usecount++; - mtx_unlock(&vp->v_interlock); -} - -/* - * Vnode put/release. - * If count drops to zero, call inactive routine and return to freelist. - */ -void -vrele(vp) - struct vnode *vp; -{ - struct proc *p = curproc; /* XXX */ - - KASSERT(vp != NULL, ("vrele: null vp")); - - mtx_lock(&vp->v_interlock); - - KASSERT(vp->v_writecount < vp->v_usecount, ("vrele: missed vn_close")); - - if (vp->v_usecount > 1) { - - vp->v_usecount--; - mtx_unlock(&vp->v_interlock); - - return; - } - - if (vp->v_usecount == 1) { - - vp->v_usecount--; - if (VSHOULDFREE(vp)) - vfree(vp); - /* - * If we are doing a vput, the node is already locked, and we must - * call VOP_INACTIVE with the node locked. So, in the case of - * vrele, we explicitly lock the vnode before calling VOP_INACTIVE. - */ - if (vn_lock(vp, LK_EXCLUSIVE | LK_INTERLOCK, p) == 0) { - VOP_INACTIVE(vp, p); - } - - } else { -#ifdef DIAGNOSTIC - vprint("vrele: negative ref count", vp); - mtx_unlock(&vp->v_interlock); -#endif - panic("vrele: negative ref cnt"); - } -} - -/* - * Release an already locked vnode. This give the same effects as - * unlock+vrele(), but takes less time and avoids releasing and - * re-aquiring the lock (as vrele() aquires the lock internally.) - */ -void -vput(vp) - struct vnode *vp; -{ - struct proc *p = curproc; /* XXX */ - - KASSERT(vp != NULL, ("vput: null vp")); - mtx_lock(&vp->v_interlock); - KASSERT(vp->v_writecount < vp->v_usecount, ("vput: missed vn_close")); - - if (vp->v_usecount > 1) { - - vp->v_usecount--; - VOP_UNLOCK(vp, LK_INTERLOCK, p); - return; - - } - - if (vp->v_usecount == 1) { - - vp->v_usecount--; - if (VSHOULDFREE(vp)) - vfree(vp); - /* - * If we are doing a vput, the node is already locked, and we must - * call VOP_INACTIVE with the node locked. So, in the case of - * vrele, we explicitly lock the vnode before calling VOP_INACTIVE. - */ - mtx_unlock(&vp->v_interlock); - VOP_INACTIVE(vp, p); - - } else { -#ifdef DIAGNOSTIC - vprint("vput: negative ref count", vp); -#endif - panic("vput: negative ref cnt"); - } -} - -/* - * Somebody doesn't want the vnode recycled. - */ -void -vhold(vp) - register struct vnode *vp; -{ - int s; - - s = splbio(); - vp->v_holdcnt++; - if (VSHOULDBUSY(vp)) - vbusy(vp); - splx(s); -} - -/* - * Note that there is one less who cares about this vnode. vdrop() is the - * opposite of vhold(). - */ -void -vdrop(vp) - register struct vnode *vp; -{ - int s; - - s = splbio(); - if (vp->v_holdcnt <= 0) - panic("vdrop: holdcnt"); - vp->v_holdcnt--; - if (VSHOULDFREE(vp)) - vfree(vp); - 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 DIAGNOSTIC -static int busyprt = 0; /* print out busy vnodes */ -SYSCTL_INT(_debug, OID_AUTO, busyprt, CTLFLAG_RW, &busyprt, 0, ""); -#endif - -int -vflush(mp, skipvp, flags) - struct mount *mp; - struct vnode *skipvp; - int flags; -{ - struct proc *p = curproc; /* XXX */ - struct vnode *vp, *nvp; - int busy = 0; - - mtx_lock(&mntvnode_mtx); -loop: - for (vp = LIST_FIRST(&mp->mnt_vnodelist); vp; vp = nvp) { - /* - * Make sure this vnode wasn't reclaimed in getnewvnode(). - * Start over if it has (it won't be on the list anymore). - */ - if (vp->v_mount != mp) - goto loop; - nvp = LIST_NEXT(vp, v_mntvnodes); - /* - * Skip over a selected vnode. - */ - if (vp == skipvp) - continue; - - mtx_lock(&vp->v_interlock); - /* - * Skip over a vnodes marked VSYSTEM. - */ - if ((flags & SKIPSYSTEM) && (vp->v_flag & VSYSTEM)) { - mtx_unlock(&vp->v_interlock); - continue; - } - /* - * If WRITECLOSE is set, only flush out regular file vnodes - * open for writing. - */ - if ((flags & WRITECLOSE) && - (vp->v_writecount == 0 || vp->v_type != VREG)) { - mtx_unlock(&vp->v_interlock); - continue; - } - - /* - * 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) { - mtx_unlock(&mntvnode_mtx); - vgonel(vp, p); - mtx_lock(&mntvnode_mtx); - continue; - } - - /* - * 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 (flags & FORCECLOSE) { - mtx_unlock(&mntvnode_mtx); - if (vp->v_type != VCHR) { - vgonel(vp, p); - } else { - vclean(vp, 0, p); - vp->v_op = spec_vnodeop_p; - insmntque(vp, (struct mount *) 0); - } - mtx_lock(&mntvnode_mtx); - continue; - } -#ifdef DIAGNOSTIC - if (busyprt) - vprint("vflush: busy vnode", vp); -#endif - mtx_unlock(&vp->v_interlock); - busy++; - } - mtx_unlock(&mntvnode_mtx); - if (busy) - return (EBUSY); - return (0); -} - -/* - * Disassociate the underlying file system from a vnode. - */ -static void -vclean(vp, flags, p) - struct vnode *vp; - int flags; - struct proc *p; -{ - int active; - - /* - * 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)) - vp->v_usecount++; - - /* - * Prevent the vnode from being recycled or brought into use while we - * clean it out. - */ - if (vp->v_flag & VXLOCK) - panic("vclean: deadlock"); - vp->v_flag |= VXLOCK; - vp->v_vxproc = curproc; - /* - * 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_DRAIN | LK_INTERLOCK, p); - - /* - * Clean out any buffers associated with the vnode. - * If the flush fails, just toss the buffers. - */ - if (flags & DOCLOSE) { - if (TAILQ_FIRST(&vp->v_dirtyblkhd) != NULL) - (void) vn_write_suspend_wait(vp, NULL, V_WAIT); - if (vinvalbuf(vp, V_SAVE, NOCRED, p, 0, 0) != 0) - vinvalbuf(vp, 0, NOCRED, p, 0, 0); - } - - VOP_DESTROYVOBJECT(vp); - - /* - * 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, 0, p); - } - /* - * Reclaim the vnode. - */ - if (VOP_RECLAIM(vp, p)) - panic("vclean: cannot reclaim"); - - if (active) { - /* - * Inline copy of vrele() since VOP_INACTIVE - * has already been called. - */ - mtx_lock(&vp->v_interlock); - if (--vp->v_usecount <= 0) { -#ifdef DIAGNOSTIC - if (vp->v_usecount < 0 || vp->v_writecount != 0) { - vprint("vclean: bad ref count", vp); - panic("vclean: ref cnt"); - } -#endif - vfree(vp); - } - mtx_unlock(&vp->v_interlock); - } - - cache_purge(vp); - vp->v_vnlock = NULL; - lockdestroy(&vp->v_lock); - - if (VSHOULDFREE(vp)) - vfree(vp); - - /* - * Done with purge, notify sleepers of the grim news. - */ - vp->v_op = dead_vnodeop_p; - vn_pollgone(vp); - vp->v_tag = VT_NON; - vp->v_flag &= ~VXLOCK; - vp->v_vxproc = NULL; - if (vp->v_flag & VXWANT) { - vp->v_flag &= ~VXWANT; - wakeup((caddr_t) vp); - } -} - -/* - * Eliminate all activity associated with the requested vnode - * and with all vnodes aliased to the requested vnode. - */ -int -vop_revoke(ap) - struct vop_revoke_args /* { - struct vnode *a_vp; - int a_flags; - } */ *ap; -{ - struct vnode *vp, *vq; - dev_t dev; - - KASSERT((ap->a_flags & REVOKEALL) != 0, ("vop_revoke")); - - vp = ap->a_vp; - /* - * If a vgone (or vclean) is already in progress, - * wait until it is done and return. - */ - if (vp->v_flag & VXLOCK) { - vp->v_flag |= VXWANT; - msleep((caddr_t)vp, &vp->v_interlock, PINOD | PDROP, - "vop_revokeall", 0); - return (0); - } - dev = vp->v_rdev; - for (;;) { - mtx_lock(&spechash_mtx); - vq = SLIST_FIRST(&dev->si_hlist); - mtx_unlock(&spechash_mtx); - if (!vq) - break; - vgone(vq); - } - return (0); -} - -/* - * Recycle an unused vnode to the front of the free list. - * Release the passed interlock if the vnode will be recycled. - */ -int -vrecycle(vp, inter_lkp, p) - struct vnode *vp; - struct mtx *inter_lkp; - struct proc *p; -{ - - mtx_lock(&vp->v_interlock); - if (vp->v_usecount == 0) { - if (inter_lkp) { - mtx_unlock(inter_lkp); - } - vgonel(vp, p); - return (1); - } - mtx_unlock(&vp->v_interlock); - return (0); -} - -/* - * Eliminate all activity associated with a vnode - * in preparation for reuse. - */ -void -vgone(vp) - register struct vnode *vp; -{ - struct proc *p = curproc; /* XXX */ - - mtx_lock(&vp->v_interlock); - vgonel(vp, p); -} - -/* - * vgone, with the vp interlock held. - */ -void -vgonel(vp, p) - struct vnode *vp; - struct proc *p; -{ - int s; - - /* - * If a vgone (or vclean) is already in progress, - * wait until it is done and return. - */ - if (vp->v_flag & VXLOCK) { - vp->v_flag |= VXWANT; - msleep((caddr_t)vp, &vp->v_interlock, PINOD | PDROP, - "vgone", 0); - return; - } - - /* - * Clean out the filesystem specific data. - */ - vclean(vp, DOCLOSE, p); - mtx_lock(&vp->v_interlock); - - /* - * Delete from old mount point vnode list, if on one. - */ - if (vp->v_mount != NULL) - insmntque(vp, (struct mount *)0); - /* - * If special device, remove it from special device alias list - * if it is on one. - */ - if (vp->v_type == VCHR && vp->v_rdev != NULL && vp->v_rdev != NODEV) { - mtx_lock(&spechash_mtx); - SLIST_REMOVE(&vp->v_rdev->si_hlist, vp, vnode, v_specnext); - freedev(vp->v_rdev); - mtx_unlock(&spechash_mtx); - vp->v_rdev = NULL; - } - - /* - * If it is on the freelist and not already at the head, - * move it to the head of the list. The test of the - * VDOOMED flag and the reference count of zero is because - * it will be removed from the free list by getnewvnode, - * but will not have its reference count incremented until - * after calling vgone. If the reference count were - * incremented first, vgone would (incorrectly) try to - * close the previous instance of the underlying object. - */ - if (vp->v_usecount == 0 && !(vp->v_flag & VDOOMED)) { - s = splbio(); - mtx_lock(&vnode_free_list_mtx); - if (vp->v_flag & VFREE) - TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); - else - freevnodes++; - vp->v_flag |= VFREE; - TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist); - mtx_unlock(&vnode_free_list_mtx); - splx(s); - } - - vp->v_type = VBAD; - mtx_unlock(&vp->v_interlock); -} - -/* - * Lookup a vnode by device number. - */ -int -vfinddev(dev, type, vpp) - dev_t dev; - enum vtype type; - struct vnode **vpp; -{ - struct vnode *vp; - - mtx_lock(&spechash_mtx); - SLIST_FOREACH(vp, &dev->si_hlist, v_specnext) { - if (type == vp->v_type) { - *vpp = vp; - mtx_unlock(&spechash_mtx); - return (1); - } - } - mtx_unlock(&spechash_mtx); - return (0); -} - -/* - * Calculate the total number of references to a special device. - */ -int -vcount(vp) - struct vnode *vp; -{ - struct vnode *vq; - int count; - - count = 0; - mtx_lock(&spechash_mtx); - SLIST_FOREACH(vq, &vp->v_rdev->si_hlist, v_specnext) - count += vq->v_usecount; - mtx_unlock(&spechash_mtx); - return (count); -} - -/* - * Same as above, but using the dev_t as argument - */ -int -count_dev(dev) - dev_t dev; -{ - struct vnode *vp; - - vp = SLIST_FIRST(&dev->si_hlist); - if (vp == NULL) - return (0); - return(vcount(vp)); -} - -/* - * Print out a description of a vnode. - */ -static char *typename[] = -{"VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD"}; - -void -vprint(label, vp) - char *label; - struct vnode *vp; -{ - char buf[96]; - - if (label != NULL) - printf("%s: %p: ", label, (void *)vp); - else - printf("%p: ", (void *)vp); - printf("type %s, usecount %d, writecount %d, refcount %d,", - typename[vp->v_type], vp->v_usecount, vp->v_writecount, - vp->v_holdcnt); - buf[0] = '\0'; - if (vp->v_flag & VROOT) - strcat(buf, "|VROOT"); - if (vp->v_flag & VTEXT) - strcat(buf, "|VTEXT"); - if (vp->v_flag & VSYSTEM) - strcat(buf, "|VSYSTEM"); - if (vp->v_flag & VXLOCK) - strcat(buf, "|VXLOCK"); - if (vp->v_flag & VXWANT) - strcat(buf, "|VXWANT"); - if (vp->v_flag & VBWAIT) - strcat(buf, "|VBWAIT"); - if (vp->v_flag & VDOOMED) - strcat(buf, "|VDOOMED"); - if (vp->v_flag & VFREE) - strcat(buf, "|VFREE"); - if (vp->v_flag & VOBJBUF) - strcat(buf, "|VOBJBUF"); - if (buf[0] != '\0') - printf(" flags (%s)", &buf[1]); - if (vp->v_data == NULL) { - printf("\n"); - } else { - printf("\n\t"); - VOP_PRINT(vp); - } -} - -#ifdef DDB -#include <ddb/ddb.h> -/* - * List all of the locked vnodes in the system. - * Called when debugging the kernel. - */ -DB_SHOW_COMMAND(lockedvnodes, lockedvnodes) -{ - struct proc *p = curproc; /* XXX */ - struct mount *mp, *nmp; - struct vnode *vp; - - printf("Locked vnodes\n"); - mtx_lock(&mountlist_mtx); - for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { - if (vfs_busy(mp, LK_NOWAIT, &mountlist_mtx, p)) { - nmp = TAILQ_NEXT(mp, mnt_list); - continue; - } - LIST_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { - if (VOP_ISLOCKED(vp, NULL)) - vprint((char *)0, vp); - } - mtx_lock(&mountlist_mtx); - nmp = TAILQ_NEXT(mp, mnt_list); - vfs_unbusy(mp, p); - } - mtx_unlock(&mountlist_mtx); -} -#endif - -/* - * Top level filesystem related information gathering. - */ -static int sysctl_ovfs_conf __P((SYSCTL_HANDLER_ARGS)); - -static int -vfs_sysctl(SYSCTL_HANDLER_ARGS) -{ - int *name = (int *)arg1 - 1; /* XXX */ - u_int namelen = arg2 + 1; /* XXX */ - struct vfsconf *vfsp; - -#if 1 || defined(COMPAT_PRELITE2) - /* Resolve ambiguity between VFS_VFSCONF and VFS_GENERIC. */ - if (namelen == 1) - return (sysctl_ovfs_conf(oidp, arg1, arg2, req)); -#endif - - /* XXX the below code does not compile; vfs_sysctl does not exist. */ -#ifdef notyet - /* all sysctl names at this level are at least name and field */ - if (namelen < 2) - return (ENOTDIR); /* overloaded */ - if (name[0] != VFS_GENERIC) { - for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) - if (vfsp->vfc_typenum == name[0]) - break; - if (vfsp == NULL) - return (EOPNOTSUPP); - return ((*vfsp->vfc_vfsops->vfs_sysctl)(&name[1], namelen - 1, - oldp, oldlenp, newp, newlen, p)); - } -#endif - switch (name[1]) { - case VFS_MAXTYPENUM: - if (namelen != 2) - return (ENOTDIR); - return (SYSCTL_OUT(req, &maxvfsconf, sizeof(int))); - case VFS_CONF: - if (namelen != 3) - return (ENOTDIR); /* overloaded */ - for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) - if (vfsp->vfc_typenum == name[2]) - break; - if (vfsp == NULL) - return (EOPNOTSUPP); - return (SYSCTL_OUT(req, vfsp, sizeof *vfsp)); - } - return (EOPNOTSUPP); -} - -SYSCTL_NODE(_vfs, VFS_GENERIC, generic, CTLFLAG_RD, vfs_sysctl, - "Generic filesystem"); - -#if 1 || defined(COMPAT_PRELITE2) - -static int -sysctl_ovfs_conf(SYSCTL_HANDLER_ARGS) -{ - int error; - struct vfsconf *vfsp; - struct ovfsconf ovfs; - - for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) { - ovfs.vfc_vfsops = vfsp->vfc_vfsops; /* XXX used as flag */ - strcpy(ovfs.vfc_name, vfsp->vfc_name); - ovfs.vfc_index = vfsp->vfc_typenum; - ovfs.vfc_refcount = vfsp->vfc_refcount; - ovfs.vfc_flags = vfsp->vfc_flags; - error = SYSCTL_OUT(req, &ovfs, sizeof ovfs); - if (error) - return error; - } - return 0; -} - -#endif /* 1 || COMPAT_PRELITE2 */ - -#if COMPILING_LINT -#define KINFO_VNODESLOP 10 -/* - * Dump vnode list (via sysctl). - * Copyout address of vnode followed by vnode. - */ -/* ARGSUSED */ -static int -sysctl_vnode(SYSCTL_HANDLER_ARGS) -{ - struct proc *p = curproc; /* XXX */ - struct mount *mp, *nmp; - struct vnode *nvp, *vp; - int error; - -#define VPTRSZ sizeof (struct vnode *) -#define VNODESZ sizeof (struct vnode) - - req->lock = 0; - if (!req->oldptr) /* Make an estimate */ - return (SYSCTL_OUT(req, 0, - (numvnodes + KINFO_VNODESLOP) * (VPTRSZ + VNODESZ))); - - mtx_lock(&mountlist_mtx); - for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { - if (vfs_busy(mp, LK_NOWAIT, &mountlist_mtx, p)) { - nmp = TAILQ_NEXT(mp, mnt_list); - continue; - } -again: - mtx_lock(&mntvnode_mtx); - for (vp = LIST_FIRST(&mp->mnt_vnodelist); - vp != NULL; - vp = nvp) { - /* - * Check that the vp is still associated with - * this filesystem. RACE: could have been - * recycled onto the same filesystem. - */ - if (vp->v_mount != mp) { - mtx_unlock(&mntvnode_mtx); - goto again; - } - nvp = LIST_NEXT(vp, v_mntvnodes); - mtx_unlock(&mntvnode_mtx); - if ((error = SYSCTL_OUT(req, &vp, VPTRSZ)) || - (error = SYSCTL_OUT(req, vp, VNODESZ))) - return (error); - mtx_lock(&mntvnode_mtx); - } - mtx_unlock(&mntvnode_mtx); - mtx_lock(&mountlist_mtx); - nmp = TAILQ_NEXT(mp, mnt_list); - vfs_unbusy(mp, p); - } - mtx_unlock(&mountlist_mtx); - - return (0); -} - -/* - * XXX - * Exporting the vnode list on large systems causes them to crash. - * Exporting the vnode list on medium systems causes sysctl to coredump. - */ -SYSCTL_PROC(_kern, KERN_VNODE, vnode, CTLTYPE_OPAQUE|CTLFLAG_RD, - 0, 0, sysctl_vnode, "S,vnode", ""); -#endif - -/* - * Check to see if a filesystem is mounted on a block device. - */ -int -vfs_mountedon(vp) - struct vnode *vp; -{ - - if (vp->v_rdev->si_mountpoint != NULL) - return (EBUSY); - return (0); -} - -/* - * Unmount all filesystems. The list is traversed in reverse order - * of mounting to avoid dependencies. - */ -void -vfs_unmountall() -{ - struct mount *mp; - struct proc *p; - int error; - - if (curproc != NULL) - p = curproc; - else - p = initproc; /* XXX XXX should this be proc0? */ - /* - * Since this only runs when rebooting, it is not interlocked. - */ - while(!TAILQ_EMPTY(&mountlist)) { - mp = TAILQ_LAST(&mountlist, mntlist); - error = dounmount(mp, MNT_FORCE, p); - if (error) { - TAILQ_REMOVE(&mountlist, mp, mnt_list); - printf("unmount of %s failed (", - mp->mnt_stat.f_mntonname); - if (error == EBUSY) - printf("BUSY)\n"); - else - printf("%d)\n", error); - } else { - /* The unmount has removed mp from the mountlist */ - } - } -} - -/* * Build hash lists of net addresses and hang them off the mount point. * Called by ufs_mount() to set up the lists of export addresses. */ @@ -2627,586 +359,6 @@ vfs_export_lookup(mp, nam) } /* - * perform msync on all vnodes under a mount point - * the mount point must be locked. - */ -void -vfs_msync(struct mount *mp, int flags) { - struct vnode *vp, *nvp; - struct vm_object *obj; - int anyio, tries; - - tries = 5; -loop: - anyio = 0; - for (vp = LIST_FIRST(&mp->mnt_vnodelist); vp != NULL; vp = nvp) { - - nvp = LIST_NEXT(vp, v_mntvnodes); - - if (vp->v_mount != mp) { - goto loop; - } - - if (vp->v_flag & VXLOCK) /* XXX: what if MNT_WAIT? */ - continue; - - if (flags != MNT_WAIT) { - if (VOP_GETVOBJECT(vp, &obj) != 0 || - (obj->flags & OBJ_MIGHTBEDIRTY) == 0) - continue; - if (VOP_ISLOCKED(vp, NULL)) - continue; - } - - mtx_lock(&vp->v_interlock); - if (VOP_GETVOBJECT(vp, &obj) == 0 && - (obj->flags & OBJ_MIGHTBEDIRTY)) { - if (!vget(vp, - LK_INTERLOCK | LK_EXCLUSIVE | LK_RETRY | LK_NOOBJ, curproc)) { - if (VOP_GETVOBJECT(vp, &obj) == 0) { - vm_object_page_clean(obj, 0, 0, flags == MNT_WAIT ? OBJPC_SYNC : OBJPC_NOSYNC); - anyio = 1; - } - vput(vp); - } - } else { - mtx_unlock(&vp->v_interlock); - } - } - if (anyio && (--tries > 0)) - goto loop; -} - -/* - * Create the VM object needed for VMIO and mmap support. This - * is done for all VREG files in the system. Some filesystems might - * afford the additional metadata buffering capability of the - * VMIO code by making the device node be VMIO mode also. - * - * vp must be locked when vfs_object_create is called. - */ -int -vfs_object_create(vp, p, cred) - struct vnode *vp; - struct proc *p; - struct ucred *cred; -{ - return (VOP_CREATEVOBJECT(vp, cred, p)); -} - -/* - * Mark a vnode as free, putting it up for recycling. - */ -void -vfree(vp) - struct vnode *vp; -{ - int s; - - s = splbio(); - mtx_lock(&vnode_free_list_mtx); - KASSERT((vp->v_flag & VFREE) == 0, ("vnode already free")); - if (vp->v_flag & VAGE) { - TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist); - } else { - TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist); - } - freevnodes++; - mtx_unlock(&vnode_free_list_mtx); - vp->v_flag &= ~VAGE; - vp->v_flag |= VFREE; - splx(s); -} - -/* - * Opposite of vfree() - mark a vnode as in use. - */ -void -vbusy(vp) - struct vnode *vp; -{ - int s; - - s = splbio(); - mtx_lock(&vnode_free_list_mtx); - KASSERT((vp->v_flag & VFREE) != 0, ("vnode not free")); - TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); - freevnodes--; - mtx_unlock(&vnode_free_list_mtx); - vp->v_flag &= ~(VFREE|VAGE); - splx(s); -} - -/* - * Record a process's interest in events which might happen to - * a vnode. Because poll uses the historic select-style interface - * internally, this routine serves as both the ``check for any - * pending events'' and the ``record my interest in future events'' - * functions. (These are done together, while the lock is held, - * to avoid race conditions.) - */ -int -vn_pollrecord(vp, p, events) - struct vnode *vp; - struct proc *p; - short events; -{ - mtx_lock(&vp->v_pollinfo.vpi_lock); - if (vp->v_pollinfo.vpi_revents & events) { - /* - * This leaves events we are not interested - * in available for the other process which - * which presumably had requested them - * (otherwise they would never have been - * recorded). - */ - events &= vp->v_pollinfo.vpi_revents; - vp->v_pollinfo.vpi_revents &= ~events; - - mtx_unlock(&vp->v_pollinfo.vpi_lock); - return events; - } - vp->v_pollinfo.vpi_events |= events; - selrecord(p, &vp->v_pollinfo.vpi_selinfo); - mtx_unlock(&vp->v_pollinfo.vpi_lock); - return 0; -} - -/* - * Note the occurrence of an event. If the VN_POLLEVENT macro is used, - * it is possible for us to miss an event due to race conditions, but - * that condition is expected to be rare, so for the moment it is the - * preferred interface. - */ -void -vn_pollevent(vp, events) - struct vnode *vp; - short events; -{ - mtx_lock(&vp->v_pollinfo.vpi_lock); - if (vp->v_pollinfo.vpi_events & events) { - /* - * We clear vpi_events so that we don't - * call selwakeup() twice if two events are - * posted before the polling process(es) is - * awakened. This also ensures that we take at - * most one selwakeup() if the polling process - * is no longer interested. However, it does - * mean that only one event can be noticed at - * a time. (Perhaps we should only clear those - * event bits which we note?) XXX - */ - vp->v_pollinfo.vpi_events = 0; /* &= ~events ??? */ - vp->v_pollinfo.vpi_revents |= events; - selwakeup(&vp->v_pollinfo.vpi_selinfo); - } - mtx_unlock(&vp->v_pollinfo.vpi_lock); -} - -#define VN_KNOTE(vp, b) \ - KNOTE((struct klist *)&vp->v_pollinfo.vpi_selinfo.si_note, (b)) - -/* - * Wake up anyone polling on vp because it is being revoked. - * This depends on dead_poll() returning POLLHUP for correct - * behavior. - */ -void -vn_pollgone(vp) - struct vnode *vp; -{ - mtx_lock(&vp->v_pollinfo.vpi_lock); - VN_KNOTE(vp, NOTE_REVOKE); - if (vp->v_pollinfo.vpi_events) { - vp->v_pollinfo.vpi_events = 0; - selwakeup(&vp->v_pollinfo.vpi_selinfo); - } - mtx_unlock(&vp->v_pollinfo.vpi_lock); -} - - - -/* - * Routine to create and manage a filesystem syncer vnode. - */ -#define sync_close ((int (*) __P((struct vop_close_args *)))nullop) -static int sync_fsync __P((struct vop_fsync_args *)); -static int sync_inactive __P((struct vop_inactive_args *)); -static int sync_reclaim __P((struct vop_reclaim_args *)); -#define sync_lock ((int (*) __P((struct vop_lock_args *)))vop_nolock) -#define sync_unlock ((int (*) __P((struct vop_unlock_args *)))vop_nounlock) -static int sync_print __P((struct vop_print_args *)); -#define sync_islocked ((int(*) __P((struct vop_islocked_args *)))vop_noislocked) - -static vop_t **sync_vnodeop_p; -static struct vnodeopv_entry_desc sync_vnodeop_entries[] = { - { &vop_default_desc, (vop_t *) vop_eopnotsupp }, - { &vop_close_desc, (vop_t *) sync_close }, /* close */ - { &vop_fsync_desc, (vop_t *) sync_fsync }, /* fsync */ - { &vop_inactive_desc, (vop_t *) sync_inactive }, /* inactive */ - { &vop_reclaim_desc, (vop_t *) sync_reclaim }, /* reclaim */ - { &vop_lock_desc, (vop_t *) sync_lock }, /* lock */ - { &vop_unlock_desc, (vop_t *) sync_unlock }, /* unlock */ - { &vop_print_desc, (vop_t *) sync_print }, /* print */ - { &vop_islocked_desc, (vop_t *) sync_islocked }, /* islocked */ - { NULL, NULL } -}; -static struct vnodeopv_desc sync_vnodeop_opv_desc = - { &sync_vnodeop_p, sync_vnodeop_entries }; - -VNODEOP_SET(sync_vnodeop_opv_desc); - -/* - * Create a new filesystem syncer vnode for the specified mount point. - */ -int -vfs_allocate_syncvnode(mp) - struct mount *mp; -{ - struct vnode *vp; - static long start, incr, next; - int error; - - /* Allocate a new vnode */ - if ((error = getnewvnode(VT_VFS, mp, sync_vnodeop_p, &vp)) != 0) { - mp->mnt_syncer = NULL; - return (error); - } - vp->v_type = VNON; - /* - * Place the vnode onto the syncer worklist. We attempt to - * scatter them about on the list so that they will go off - * at evenly distributed times even if all the filesystems - * are mounted at once. - */ - next += incr; - if (next == 0 || next > syncer_maxdelay) { - start /= 2; - incr /= 2; - if (start == 0) { - start = syncer_maxdelay / 2; - incr = syncer_maxdelay; - } - next = start; - } - vn_syncer_add_to_worklist(vp, syncdelay > 0 ? next % syncdelay : 0); - mp->mnt_syncer = vp; - return (0); -} - -/* - * Do a lazy sync of the filesystem. - */ -static int -sync_fsync(ap) - struct vop_fsync_args /* { - struct vnode *a_vp; - struct ucred *a_cred; - int a_waitfor; - struct proc *a_p; - } */ *ap; -{ - struct vnode *syncvp = ap->a_vp; - struct mount *mp = syncvp->v_mount; - struct proc *p = ap->a_p; - int asyncflag; - - /* - * We only need to do something if this is a lazy evaluation. - */ - if (ap->a_waitfor != MNT_LAZY) - return (0); - - /* - * Move ourselves to the back of the sync list. - */ - vn_syncer_add_to_worklist(syncvp, syncdelay); - - /* - * Walk the list of vnodes pushing all that are dirty and - * not already on the sync list. - */ - mtx_lock(&mountlist_mtx); - if (vfs_busy(mp, LK_EXCLUSIVE | LK_NOWAIT, &mountlist_mtx, p) != 0) { - mtx_unlock(&mountlist_mtx); - return (0); - } - if (vn_start_write(NULL, &mp, V_NOWAIT) != 0) { - vfs_unbusy(mp, p); - return (0); - } - asyncflag = mp->mnt_flag & MNT_ASYNC; - mp->mnt_flag &= ~MNT_ASYNC; - vfs_msync(mp, MNT_NOWAIT); - VFS_SYNC(mp, MNT_LAZY, ap->a_cred, p); - if (asyncflag) - mp->mnt_flag |= MNT_ASYNC; - vn_finished_write(mp); - vfs_unbusy(mp, p); - return (0); -} - -/* - * The syncer vnode is no referenced. - */ -static int -sync_inactive(ap) - struct vop_inactive_args /* { - struct vnode *a_vp; - struct proc *a_p; - } */ *ap; -{ - - vgone(ap->a_vp); - return (0); -} - -/* - * The syncer vnode is no longer needed and is being decommissioned. - * - * Modifications to the worklist must be protected at splbio(). - */ -static int -sync_reclaim(ap) - struct vop_reclaim_args /* { - struct vnode *a_vp; - } */ *ap; -{ - struct vnode *vp = ap->a_vp; - int s; - - s = splbio(); - vp->v_mount->mnt_syncer = NULL; - if (vp->v_flag & VONWORKLST) { - LIST_REMOVE(vp, v_synclist); - vp->v_flag &= ~VONWORKLST; - } - splx(s); - - return (0); -} - -/* - * Print out a syncer vnode. - */ -static int -sync_print(ap) - struct vop_print_args /* { - struct vnode *a_vp; - } */ *ap; -{ - struct vnode *vp = ap->a_vp; - - printf("syncer vnode"); - if (vp->v_vnlock != NULL) - lockmgr_printinfo(vp->v_vnlock); - printf("\n"); - return (0); -} - -/* - * extract the dev_t from a VCHR - */ -dev_t -vn_todev(vp) - struct vnode *vp; -{ - if (vp->v_type != VCHR) - return (NODEV); - return (vp->v_rdev); -} - -/* - * Check if vnode represents a disk device - */ -int -vn_isdisk(vp, errp) - struct vnode *vp; - int *errp; -{ - struct cdevsw *cdevsw; - - if (vp->v_type != VCHR) { - if (errp != NULL) - *errp = ENOTBLK; - return (0); - } - if (vp->v_rdev == NULL) { - if (errp != NULL) - *errp = ENXIO; - return (0); - } - cdevsw = devsw(vp->v_rdev); - if (cdevsw == NULL) { - if (errp != NULL) - *errp = ENXIO; - return (0); - } - if (!(cdevsw->d_flags & D_DISK)) { - if (errp != NULL) - *errp = ENOTBLK; - return (0); - } - if (errp != NULL) - *errp = 0; - return (1); -} - -/* - * Free data allocated by namei(); see namei(9) for details. - */ -void -NDFREE(ndp, flags) - struct nameidata *ndp; - const uint flags; -{ - if (!(flags & NDF_NO_FREE_PNBUF) && - (ndp->ni_cnd.cn_flags & HASBUF)) { - zfree(namei_zone, ndp->ni_cnd.cn_pnbuf); - ndp->ni_cnd.cn_flags &= ~HASBUF; - } - if (!(flags & NDF_NO_DVP_UNLOCK) && - (ndp->ni_cnd.cn_flags & LOCKPARENT) && - ndp->ni_dvp != ndp->ni_vp) - VOP_UNLOCK(ndp->ni_dvp, 0, ndp->ni_cnd.cn_proc); - if (!(flags & NDF_NO_DVP_RELE) && - (ndp->ni_cnd.cn_flags & (LOCKPARENT|WANTPARENT))) { - vrele(ndp->ni_dvp); - ndp->ni_dvp = NULL; - } - if (!(flags & NDF_NO_VP_UNLOCK) && - (ndp->ni_cnd.cn_flags & LOCKLEAF) && ndp->ni_vp) - VOP_UNLOCK(ndp->ni_vp, 0, ndp->ni_cnd.cn_proc); - if (!(flags & NDF_NO_VP_RELE) && - ndp->ni_vp) { - vrele(ndp->ni_vp); - ndp->ni_vp = NULL; - } - if (!(flags & NDF_NO_STARTDIR_RELE) && - (ndp->ni_cnd.cn_flags & SAVESTART)) { - vrele(ndp->ni_startdir); - ndp->ni_startdir = NULL; - } -} - -/* - * Common file system object access control check routine. Accepts a - * vnode's type, "mode", uid and gid, requested access mode, credentials, - * and optional call-by-reference privused argument allowing vaccess() - * to indicate to the caller whether privilege was used to satisfy the - * request. Returns 0 on success, or an errno on failure. - */ -int -vaccess(type, file_mode, file_uid, file_gid, acc_mode, cred, privused) - enum vtype type; - mode_t file_mode; - uid_t file_uid; - gid_t file_gid; - mode_t acc_mode; - struct ucred *cred; - int *privused; -{ - mode_t dac_granted; -#ifdef CAPABILITIES - mode_t cap_granted; -#endif - - /* - * Look for a normal, non-privileged way to access the file/directory - * as requested. If it exists, go with that. - */ - - if (privused != NULL) - *privused = 0; - - dac_granted = 0; - - /* Check the owner. */ - if (cred->cr_uid == file_uid) { - dac_granted |= VADMIN; - if (file_mode & S_IXUSR) - dac_granted |= VEXEC; - if (file_mode & S_IRUSR) - dac_granted |= VREAD; - if (file_mode & S_IWUSR) - dac_granted |= VWRITE; - - if ((acc_mode & dac_granted) == acc_mode) - return (0); - - goto privcheck; - } - - /* Otherwise, check the groups (first match) */ - if (groupmember(file_gid, cred)) { - if (file_mode & S_IXGRP) - dac_granted |= VEXEC; - if (file_mode & S_IRGRP) - dac_granted |= VREAD; - if (file_mode & S_IWGRP) - dac_granted |= VWRITE; - - if ((acc_mode & dac_granted) == acc_mode) - return (0); - - goto privcheck; - } - - /* Otherwise, check everyone else. */ - if (file_mode & S_IXOTH) - dac_granted |= VEXEC; - if (file_mode & S_IROTH) - dac_granted |= VREAD; - if (file_mode & S_IWOTH) - dac_granted |= VWRITE; - if ((acc_mode & dac_granted) == acc_mode) - return (0); - -privcheck: - if (!suser_xxx(cred, NULL, PRISON_ROOT)) { - /* XXX audit: privilege used */ - if (privused != NULL) - *privused = 1; - return (0); - } - -#ifdef CAPABILITIES - /* - * Build a capability mask to determine if the set of capabilities - * satisfies the requirements when combined with the granted mask - * from above. - * For each capability, if the capability is required, bitwise - * or the request type onto the cap_granted mask. - */ - cap_granted = 0; - if ((acc_mode & VEXEC) && ((dac_granted & VEXEC) == 0) && - !cap_check_xxx(cred, NULL, CAP_DAC_EXECUTE, PRISON_ROOT)) - cap_granted |= VEXEC; - - if ((acc_mode & VREAD) && ((dac_granted & VREAD) == 0) && - !cap_check_xxx(cred, NULL, CAP_DAC_READ_SEARCH, PRISON_ROOT)) - cap_granted |= VREAD; - - if ((acc_mode & VWRITE) && ((dac_granted & VWRITE) == 0) && - !cap_check_xxx(cred, NULL, CAP_DAC_WRITE, PRISON_ROOT)) - cap_granted |= VWRITE; - - if ((acc_mode & VADMIN) && ((dac_granted & VADMIN) == 0) && - !cap_check_xxx(cred, NULL, CAP_FOWNER, PRISON_ROOT)) - cap_granted |= VADMIN; - - if ((acc_mode & (cap_granted | dac_granted)) == acc_mode) { - /* XXX audit: privilege used */ - if (privused != NULL) - *privused = 1; - return (0); - } -#endif - - return ((acc_mode & VADMIN) ? EPERM : EACCES); -} - -/* * XXX: This comment comes from the deprecated ufs_check_export() * XXX: and may not entirely apply, but lacking something better: * This is the generic part of fhtovp called after the underlying diff --git a/sys/kern/vfs_subr.c b/sys/kern/vfs_subr.c index 4bb58fe..17d4089 100644 --- a/sys/kern/vfs_subr.c +++ b/sys/kern/vfs_subr.c @@ -50,38 +50,24 @@ #include <sys/bio.h> #include <sys/buf.h> #include <sys/conf.h> -#include <sys/dirent.h> -#include <sys/domain.h> #include <sys/eventhandler.h> -#include <sys/event.h> #include <sys/fcntl.h> #include <sys/kernel.h> #include <sys/kthread.h> -#include <sys/ktr.h> #include <sys/malloc.h> -#include <net/radix.h> -#include <sys/socket.h> #include <sys/mount.h> -#include <sys/mutex.h> #include <sys/namei.h> -#include <sys/proc.h> -#include <sys/reboot.h> -#include <sys/socket.h> #include <sys/stat.h> #include <sys/sysctl.h> #include <sys/vmmeter.h> #include <sys/vnode.h> -#include <machine/limits.h> -#include <net/radix.h> #include <vm/vm.h> #include <vm/vm_object.h> #include <vm/vm_extern.h> #include <vm/pmap.h> #include <vm/vm_map.h> #include <vm/vm_page.h> -#include <vm/vm_pager.h> -#include <vm/vnode_pager.h> #include <vm/vm_zone.h> static MALLOC_DEFINE(M_NETADDR, "Export Host", "Export host address structure"); @@ -253,28 +239,6 @@ int desiredvnodes; SYSCTL_INT(_kern, KERN_MAXVNODES, maxvnodes, CTLFLAG_RW, &desiredvnodes, 0, "Maximum number of vnodes"); -static void vfs_free_addrlist __P((struct netexport *nep)); -static int vfs_free_netcred __P((struct radix_node *rn, void *w)); -static int vfs_hang_addrlist __P((struct mount *mp, struct netexport *nep, - struct export_args *argp)); - -/* - * Network address lookup element - */ -struct netcred { - struct radix_node netc_rnodes[2]; - int netc_exflags; - struct ucred netc_anon; -}; - -/* - * Network export information - */ -struct netexport { - struct netcred ne_defexported; /* Default export */ - struct radix_node_head *ne_rtable[AF_MAX+1]; /* Individual exports */ -}; - /* * Initialize the vnode management data structures. */ @@ -2343,290 +2307,6 @@ vfs_unmountall() } /* - * Build hash lists of net addresses and hang them off the mount point. - * Called by ufs_mount() to set up the lists of export addresses. - */ -static int -vfs_hang_addrlist(mp, nep, argp) - struct mount *mp; - struct netexport *nep; - struct export_args *argp; -{ - register struct netcred *np; - register struct radix_node_head *rnh; - register int i; - struct radix_node *rn; - struct sockaddr *saddr, *smask = 0; - struct domain *dom; - int error; - - if (argp->ex_addrlen == 0) { - if (mp->mnt_flag & MNT_DEFEXPORTED) - return (EPERM); - np = &nep->ne_defexported; - np->netc_exflags = argp->ex_flags; - bzero(&np->netc_anon, sizeof(np->netc_anon)); - np->netc_anon.cr_uid = argp->ex_anon.cr_uid; - np->netc_anon.cr_ngroups = argp->ex_anon.cr_ngroups; - bcopy(argp->ex_anon.cr_groups, np->netc_anon.cr_groups, - sizeof(np->netc_anon.cr_groups)); - np->netc_anon.cr_ref = 1; - mp->mnt_flag |= MNT_DEFEXPORTED; - return (0); - } - i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen; - np = (struct netcred *) malloc(i, M_NETADDR, M_WAITOK | M_ZERO); - saddr = (struct sockaddr *) (np + 1); - if ((error = copyin(argp->ex_addr, (caddr_t) saddr, argp->ex_addrlen))) - 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, (caddr_t) smask, argp->ex_masklen); - if (error) - goto out; - if (smask->sa_len > argp->ex_masklen) - smask->sa_len = argp->ex_masklen; - } - i = saddr->sa_family; - if ((rnh = nep->ne_rtable[i]) == 0) { - /* - * Seems silly to initialize every AF when most are not used, - * do so on demand here - */ - for (dom = domains; dom; dom = dom->dom_next) - if (dom->dom_family == i && dom->dom_rtattach) { - dom->dom_rtattach((void **) &nep->ne_rtable[i], - dom->dom_rtoffset); - break; - } - if ((rnh = nep->ne_rtable[i]) == 0) { - error = ENOBUFS; - goto out; - } - } - rn = (*rnh->rnh_addaddr) ((caddr_t) saddr, (caddr_t) smask, rnh, - np->netc_rnodes); - if (rn == 0 || np != (struct netcred *) rn) { /* already exists */ - error = EPERM; - goto out; - } - np->netc_exflags = argp->ex_flags; - bzero(&np->netc_anon, sizeof(np->netc_anon)); - np->netc_anon.cr_uid = argp->ex_anon.cr_uid; - np->netc_anon.cr_ngroups = argp->ex_anon.cr_ngroups; - bcopy(argp->ex_anon.cr_groups, np->netc_anon.cr_groups, - sizeof(np->netc_anon.cr_groups)); - np->netc_anon.cr_ref = 1; - return (0); -out: - free(np, M_NETADDR); - return (error); -} - -/* Helper for vfs_free_addrlist. */ -/* ARGSUSED */ -static int -vfs_free_netcred(rn, w) - struct radix_node *rn; - void *w; -{ - register struct radix_node_head *rnh = (struct radix_node_head *) w; - - (*rnh->rnh_deladdr) (rn->rn_key, rn->rn_mask, rnh); - free((caddr_t) rn, M_NETADDR); - return (0); -} - -/* - * Free the net address hash lists that are hanging off the mount points. - */ -static void -vfs_free_addrlist(nep) - struct netexport *nep; -{ - register int i; - register struct radix_node_head *rnh; - - for (i = 0; i <= AF_MAX; i++) - if ((rnh = nep->ne_rtable[i])) { - (*rnh->rnh_walktree) (rnh, vfs_free_netcred, - (caddr_t) rnh); - free((caddr_t) rnh, M_RTABLE); - nep->ne_rtable[i] = 0; - } -} - -/* - * High level function to manipulate export options on a mount point - * and the passed in netexport. - * Struct export_args *argp is the variable used to twiddle options, - * the structure is described in sys/mount.h - */ -int -vfs_export(mp, argp) - struct mount *mp; - struct export_args *argp; -{ - struct netexport *nep; - int error; - - nep = mp->mnt_export; - if (argp->ex_flags & MNT_DELEXPORT) { - if (nep == NULL) - return (EINVAL); - if (mp->mnt_flag & MNT_EXPUBLIC) { - vfs_setpublicfs(NULL, NULL, NULL); - mp->mnt_flag &= ~MNT_EXPUBLIC; - } - vfs_free_addrlist(nep); - mp->mnt_export = NULL; - free(nep, M_MOUNT); - mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED); - } - if (argp->ex_flags & MNT_EXPORTED) { - if (nep == NULL) { - nep = malloc(sizeof(struct netexport), M_MOUNT, M_WAITOK | M_ZERO); - mp->mnt_export = nep; - } - if (argp->ex_flags & MNT_EXPUBLIC) { - if ((error = vfs_setpublicfs(mp, nep, argp)) != 0) - return (error); - mp->mnt_flag |= MNT_EXPUBLIC; - } - if ((error = vfs_hang_addrlist(mp, nep, argp))) - return (error); - mp->mnt_flag |= MNT_EXPORTED; - } - return (0); -} - -/* - * Set the publicly exported filesystem (WebNFS). Currently, only - * one public filesystem is possible in the spec (RFC 2054 and 2055) - */ -int -vfs_setpublicfs(mp, nep, argp) - struct mount *mp; - struct netexport *nep; - struct export_args *argp; -{ - int error; - struct vnode *rvp; - char *cp; - - /* - * mp == NULL -> invalidate the current info, the FS is - * no longer exported. May be called from either vfs_export - * or unmount, so check if it hasn't already been done. - */ - if (mp == NULL) { - if (nfs_pub.np_valid) { - nfs_pub.np_valid = 0; - if (nfs_pub.np_index != NULL) { - FREE(nfs_pub.np_index, M_TEMP); - nfs_pub.np_index = NULL; - } - } - return (0); - } - - /* - * Only one allowed at a time. - */ - if (nfs_pub.np_valid != 0 && mp != nfs_pub.np_mount) - return (EBUSY); - - /* - * Get real filehandle for root of exported FS. - */ - bzero((caddr_t)&nfs_pub.np_handle, sizeof(nfs_pub.np_handle)); - nfs_pub.np_handle.fh_fsid = mp->mnt_stat.f_fsid; - - if ((error = VFS_ROOT(mp, &rvp))) - return (error); - - if ((error = VFS_VPTOFH(rvp, &nfs_pub.np_handle.fh_fid))) - return (error); - - vput(rvp); - - /* - * If an indexfile was specified, pull it in. - */ - if (argp->ex_indexfile != NULL) { - MALLOC(nfs_pub.np_index, char *, MAXNAMLEN + 1, M_TEMP, - M_WAITOK); - error = copyinstr(argp->ex_indexfile, nfs_pub.np_index, - MAXNAMLEN, (size_t *)0); - if (!error) { - /* - * Check for illegal filenames. - */ - for (cp = nfs_pub.np_index; *cp; cp++) { - if (*cp == '/') { - error = EINVAL; - break; - } - } - } - if (error) { - FREE(nfs_pub.np_index, M_TEMP); - return (error); - } - } - - nfs_pub.np_mount = mp; - nfs_pub.np_valid = 1; - return (0); -} - -/* - * Used by the filesystems to determine if a given network address - * (passed in 'nam') is present in thier exports list, returns a pointer - * to struct netcred so that the filesystem can examine it for - * access rights (read/write/etc). - */ -struct netcred * -vfs_export_lookup(mp, nam) - register struct mount *mp; - struct sockaddr *nam; -{ - struct netexport *nep; - register struct netcred *np; - register struct radix_node_head *rnh; - struct sockaddr *saddr; - - nep = mp->mnt_export; - if (nep == NULL) - return (NULL); - np = NULL; - if (mp->mnt_flag & MNT_EXPORTED) { - /* - * Lookup in the export list first. - */ - if (nam != NULL) { - saddr = nam; - rnh = nep->ne_rtable[saddr->sa_family]; - if (rnh != NULL) { - np = (struct netcred *) - (*rnh->rnh_matchaddr)((caddr_t)saddr, - rnh); - if (np && np->netc_rnodes->rn_flags & RNF_ROOT) - np = NULL; - } - } - /* - * If no address match, use the default if it exists. - */ - if (np == NULL && mp->mnt_flag & MNT_DEFEXPORTED) - np = &nep->ne_defexported; - } - return (np); -} - -/* * perform msync on all vnodes under a mount point * the mount point must be locked. */ @@ -3206,29 +2886,3 @@ privcheck: return ((acc_mode & VADMIN) ? EPERM : EACCES); } -/* - * XXX: This comment comes from the deprecated ufs_check_export() - * XXX: and may not entirely apply, but lacking something better: - * This is the generic part of fhtovp called after the underlying - * filesystem has validated the file handle. - * - * Verify that a host should have access to a filesystem. - */ - -int -vfs_stdcheckexp(mp, nam, extflagsp, credanonp) - struct mount *mp; - struct sockaddr *nam; - int *extflagsp; - struct ucred **credanonp; -{ - struct netcred *np; - - np = vfs_export_lookup(mp, nam); - if (np == NULL) - return (EACCES); - *extflagsp = np->netc_exflags; - *credanonp = &np->netc_anon; - return (0); -} - |
