/* $NetBSD: vfs_subr2.c,v 1.12 2008/01/09 16:15:22 ad Exp $ */ /*- * Copyright (c) 1997, 1998, 2004, 2005, 2007 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, * NASA Ames Research Center, by Charles M. Hannum, and by Andrew Doran. * * 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the NetBSD * Foundation, Inc. and its contributors. * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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. */ /* * 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. * * This file contains vfs subroutines which do not heavily depend on * the kernel environment and are therefore suitable to be compiled * outside of the kernel. */ #include __KERNEL_RCSID(0, "$NetBSD: vfs_subr2.c,v 1.12 2008/01/09 16:15:22 ad Exp $"); #include "opt_ddb.h" #include #include #include #include #include #include #include #include #include #include #include #include #include const enum vtype iftovt_tab[16] = { VNON, VFIFO, VCHR, VNON, VDIR, VNON, VBLK, VNON, VREG, VNON, VLNK, VNON, VSOCK, VNON, VNON, VBAD, }; const int vttoif_tab[9] = { 0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK, S_IFSOCK, S_IFIFO, S_IFMT, }; /* * 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); \ (bp)->b_vnbufs.le_next = NOLIST; \ } int doforce = 1; /* 1 => permit forcible unmounting */ int prtactive = 0; /* 1 => print out reclaim of active vnodes */ kmutex_t mountlist_lock; kmutex_t mntid_lock; kmutex_t mntvnode_lock; kmutex_t vnode_free_list_lock; kmutex_t spechash_lock; kmutex_t vfs_list_lock; struct mntlist mountlist = /* mounted filesystem list */ CIRCLEQ_HEAD_INITIALIZER(mountlist); static specificdata_domain_t mount_specificdata_domain; /* * These define the root filesystem and device. */ struct vnode *rootvnode; struct device *root_device; /* root device */ #ifdef DEBUG void printlockedvnodes(void); #endif u_int numvnodes; /* * Initialize the vnode management data structures. */ void vntblinit(void) { mutex_init(&mountlist_lock, MUTEX_DEFAULT, IPL_NONE); mutex_init(&mntid_lock, MUTEX_DEFAULT, IPL_NONE); mutex_init(&mntvnode_lock, MUTEX_DEFAULT, IPL_NONE); mutex_init(&vnode_free_list_lock, MUTEX_DEFAULT, IPL_NONE); mutex_init(&spechash_lock, MUTEX_DEFAULT, IPL_NONE); mutex_init(&vfs_list_lock, MUTEX_DEFAULT, IPL_NONE); mount_specificdata_domain = specificdata_domain_create(); /* Initialize the filesystem syncer. */ vn_initialize_syncerd(); vn_init1(); } /* * Lookup a mount point by filesystem identifier. * * XXX Needs to add a reference to the mount point. */ struct mount * vfs_getvfs(fsid_t *fsid) { struct mount *mp; mutex_enter(&mountlist_lock); CIRCLEQ_FOREACH(mp, &mountlist, mnt_list) { if (mp->mnt_stat.f_fsidx.__fsid_val[0] == fsid->__fsid_val[0] && mp->mnt_stat.f_fsidx.__fsid_val[1] == fsid->__fsid_val[1]) { mutex_exit(&mountlist_lock); return (mp); } } mutex_exit(&mountlist_lock); return ((struct mount *)0); } /* * Free a mount structure. */ void vfs_destroy(struct mount *mp) { specificdata_fini(mount_specificdata_domain, &mp->mnt_specdataref); mutex_destroy(&mp->mnt_mutex); lockdestroy(&mp->mnt_lock); free(mp, M_MOUNT); } /* * Wait for a vnode (typically with VI_XLOCK set) to be cleaned or * recycled. */ void vwait(vnode_t *vp, int flags) { KASSERT(mutex_owned(&vp->v_interlock)); KASSERT(vp->v_usecount != 0); while ((vp->v_iflag & flags) != 0) cv_wait(&vp->v_cv, &vp->v_interlock); } /* * Insert a marker vnode into a mount's vnode list, after the * specified vnode. mntvnode_lock must be held. */ void vmark(vnode_t *mvp, vnode_t *vp) { struct mount *mp; mp = mvp->v_mount; KASSERT(mutex_owned(&mntvnode_lock)); KASSERT((mvp->v_iflag & VI_MARKER) != 0); KASSERT(vp->v_mount == mp); TAILQ_INSERT_AFTER(&mp->mnt_vnodelist, vp, mvp, v_mntvnodes); } /* * Remove a marker vnode from a mount's vnode list, and return * a pointer to the next vnode in the list. mntvnode_lock must * be held. */ vnode_t * vunmark(vnode_t *mvp) { vnode_t *vp; struct mount *mp; mp = mvp->v_mount; KASSERT(mutex_owned(&mntvnode_lock)); KASSERT((mvp->v_iflag & VI_MARKER) != 0); vp = TAILQ_NEXT(mvp, v_mntvnodes); TAILQ_REMOVE(&mp->mnt_vnodelist, mvp, v_mntvnodes); KASSERT(vp == NULL || vp->v_mount == mp); return vp; } /* * Update outstanding I/O count and do wakeup if requested. */ void vwakeup(struct buf *bp) { struct vnode *vp; if ((vp = bp->b_vp) == NULL) return; KASSERT(bp->b_objlock == &vp->v_interlock); KASSERT(mutex_owned(bp->b_objlock)); if (--vp->v_numoutput < 0) panic("vwakeup: neg numoutput, vp %p", vp); if (vp->v_numoutput == 0) cv_broadcast(&vp->v_cv); } /* * Flush out and invalidate all buffers associated with a vnode. * Called with the underlying vnode locked, which should prevent new dirty * buffers from being queued. */ int vinvalbuf(struct vnode *vp, int flags, kauth_cred_t cred, struct lwp *l, bool catch, int slptimeo) { struct buf *bp, *nbp; int error; int flushflags = PGO_ALLPAGES | PGO_FREE | PGO_SYNCIO | (flags & V_SAVE ? PGO_CLEANIT | PGO_RECLAIM : 0); /* XXXUBC this doesn't look at flags or slp* */ mutex_enter(&vp->v_interlock); error = VOP_PUTPAGES(vp, 0, 0, flushflags); if (error) { return error; } if (flags & V_SAVE) { error = VOP_FSYNC(vp, cred, FSYNC_WAIT|FSYNC_RECLAIM, 0, 0); if (error) return (error); KASSERT(vp->v_numoutput == 0 && LIST_EMPTY(&vp->v_dirtyblkhd)); } mutex_enter(&bufcache_lock); restart: for (bp = LIST_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { nbp = LIST_NEXT(bp, b_vnbufs); error = bbusy(bp, catch, slptimeo); if (error != 0) { if (error == EPASSTHROUGH) goto restart; mutex_exit(&bufcache_lock); return (error); } brelsel(bp, BC_INVAL | BC_VFLUSH); } for (bp = LIST_FIRST(&vp->v_cleanblkhd); bp; bp = nbp) { nbp = LIST_NEXT(bp, b_vnbufs); error = bbusy(bp, catch, slptimeo); if (error != 0) { if (error == EPASSTHROUGH) goto restart; mutex_exit(&bufcache_lock); 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. */ if ((bp->b_oflags & BO_DELWRI) && (flags & V_SAVE)) { #ifdef DEBUG printf("buffer still DELWRI\n"); #endif bp->b_cflags |= BC_BUSY | BC_VFLUSH; mutex_exit(&bufcache_lock); VOP_BWRITE(bp); mutex_enter(&bufcache_lock); goto restart; } brelsel(bp, BC_INVAL | BC_VFLUSH); } #ifdef DIAGNOSTIC if (!LIST_EMPTY(&vp->v_cleanblkhd) || !LIST_EMPTY(&vp->v_dirtyblkhd)) panic("vinvalbuf: flush failed, vp %p", vp); #endif mutex_exit(&bufcache_lock); return (0); } /* * Destroy any in core blocks past the truncation length. * Called with the underlying vnode locked, which should prevent new dirty * buffers from being queued. */ int vtruncbuf(struct vnode *vp, daddr_t lbn, bool catch, int slptimeo) { struct buf *bp, *nbp; int error; voff_t off; off = round_page((voff_t)lbn << vp->v_mount->mnt_fs_bshift); mutex_enter(&vp->v_interlock); error = VOP_PUTPAGES(vp, off, 0, PGO_FREE | PGO_SYNCIO); if (error) { return error; } mutex_enter(&bufcache_lock); restart: for (bp = LIST_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { nbp = LIST_NEXT(bp, b_vnbufs); if (bp->b_lblkno < lbn) continue; error = bbusy(bp, catch, slptimeo); if (error != 0) { if (error == EPASSTHROUGH) goto restart; mutex_exit(&bufcache_lock); return (error); } brelsel(bp, BC_INVAL | BC_VFLUSH); } for (bp = LIST_FIRST(&vp->v_cleanblkhd); bp; bp = nbp) { nbp = LIST_NEXT(bp, b_vnbufs); if (bp->b_lblkno < lbn) continue; error = bbusy(bp, catch, slptimeo); if (error != 0) { if (error == EPASSTHROUGH) goto restart; mutex_exit(&bufcache_lock); return (error); } brelsel(bp, BC_INVAL | BC_VFLUSH); } mutex_exit(&bufcache_lock); return (0); } /* * Flush all dirty buffers from a vnode. * Called with the underlying vnode locked, which should prevent new dirty * buffers from being queued. */ void vflushbuf(struct vnode *vp, int sync) { struct buf *bp, *nbp; int flags = PGO_CLEANIT | PGO_ALLPAGES | (sync ? PGO_SYNCIO : 0); bool dirty; mutex_enter(&vp->v_interlock); (void) VOP_PUTPAGES(vp, 0, 0, flags); loop: mutex_enter(&bufcache_lock); for (bp = LIST_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { nbp = LIST_NEXT(bp, b_vnbufs); if ((bp->b_cflags & BC_BUSY)) continue; if ((bp->b_oflags & BO_DELWRI) == 0) panic("vflushbuf: not dirty, bp %p", bp); bp->b_cflags |= BC_BUSY | BC_VFLUSH; mutex_exit(&bufcache_lock); /* * 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; } mutex_exit(&bufcache_lock); if (sync == 0) return; mutex_enter(&vp->v_interlock); while (vp->v_numoutput != 0) cv_wait(&vp->v_cv, &vp->v_interlock); dirty = !LIST_EMPTY(&vp->v_dirtyblkhd); mutex_exit(&vp->v_interlock); if (dirty) { vprint("vflushbuf: dirty", vp); goto loop; } } /* * Associate a buffer with a vnode. There must already be a hold on * the vnode. */ void bgetvp(struct vnode *vp, struct buf *bp) { KASSERT(bp->b_vp == NULL); KASSERT(bp->b_objlock == &buffer_lock); KASSERT(mutex_owned(&vp->v_interlock)); KASSERT(mutex_owned(&bufcache_lock)); KASSERT((bp->b_cflags & BC_BUSY) != 0); vholdl(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); bp->b_objlock = &vp->v_interlock; } /* * Disassociate a buffer from a vnode. */ void brelvp(struct buf *bp) { struct vnode *vp = bp->b_vp; KASSERT(vp != NULL); KASSERT(bp->b_objlock == &vp->v_interlock); KASSERT(mutex_owned(&vp->v_interlock)); KASSERT(mutex_owned(&bufcache_lock)); KASSERT((bp->b_cflags & BC_BUSY) != 0); /* * Delete from old vnode list, if on one. */ if (LIST_NEXT(bp, b_vnbufs) != NOLIST) bufremvn(bp); if (TAILQ_EMPTY(&vp->v_uobj.memq) && (vp->v_iflag & VI_ONWORKLST) && LIST_FIRST(&vp->v_dirtyblkhd) == NULL) { vp->v_iflag &= ~VI_WRMAPDIRTY; vn_syncer_remove_from_worklist(vp); } bp->b_objlock = &buffer_lock; bp->b_vp = NULL; holdrelel(vp); } /* * Reassign a buffer from one vnode list to another. * The list reassignment must be within the same vnode. * Used to assign file specific control information * (indirect blocks) to the list to which they belong. */ void reassignbuf(struct buf *bp, struct vnode *vp) { struct buflists *listheadp; int delayx; KASSERT(mutex_owned(&bufcache_lock)); KASSERT(bp->b_objlock == &vp->v_interlock); KASSERT(mutex_owned(&vp->v_interlock)); KASSERT((bp->b_cflags & BC_BUSY) != 0); /* * 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_oflags & BO_DELWRI) == 0) { listheadp = &vp->v_cleanblkhd; if (TAILQ_EMPTY(&vp->v_uobj.memq) && (vp->v_iflag & VI_ONWORKLST) && LIST_FIRST(&vp->v_dirtyblkhd) == NULL) { vp->v_iflag &= ~VI_WRMAPDIRTY; vn_syncer_remove_from_worklist(vp); } } else { listheadp = &vp->v_dirtyblkhd; if ((vp->v_iflag & VI_ONWORKLST) == 0) { switch (vp->v_type) { case VDIR: delayx = dirdelay; break; case VBLK: if (vp->v_specmountpoint != NULL) { delayx = metadelay; break; } /* fall through */ default: delayx = filedelay; break; } if (!vp->v_mount || (vp->v_mount->mnt_flag & MNT_ASYNC) == 0) vn_syncer_add_to_worklist(vp, delayx); } } bufinsvn(bp, listheadp); } /* * Get a new unique fsid */ void vfs_getnewfsid(struct mount *mp) { static u_short xxxfs_mntid; fsid_t tfsid; int mtype; mutex_enter(&mntid_lock); mtype = makefstype(mp->mnt_op->vfs_name); mp->mnt_stat.f_fsidx.__fsid_val[0] = makedev(mtype, 0); mp->mnt_stat.f_fsidx.__fsid_val[1] = mtype; mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; if (xxxfs_mntid == 0) ++xxxfs_mntid; tfsid.__fsid_val[0] = makedev(mtype & 0xff, xxxfs_mntid); tfsid.__fsid_val[1] = mtype; if (!CIRCLEQ_EMPTY(&mountlist)) { while (vfs_getvfs(&tfsid)) { tfsid.__fsid_val[0]++; xxxfs_mntid++; } } mp->mnt_stat.f_fsidx.__fsid_val[0] = tfsid.__fsid_val[0]; mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; mutex_exit(&mntid_lock); } /* * Make a 'unique' number from a mount type name. */ long makefstype(const char *type) { long rv; for (rv = 0; *type; type++) { rv <<= 2; rv ^= *type; } return rv; } /* * Set vnode attributes to VNOVAL */ void vattr_null(struct vattr *vap) { vap->va_type = VNON; /* * Assign individually so that it is safe even if size and * sign of each member are varied. */ 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 = vap->va_mtime.tv_sec = vap->va_ctime.tv_sec = vap->va_birthtime.tv_sec = VNOVAL; vap->va_atime.tv_nsec = vap->va_mtime.tv_nsec = vap->va_ctime.tv_nsec = vap->va_birthtime.tv_nsec = VNOVAL; vap->va_gen = VNOVAL; vap->va_flags = VNOVAL; vap->va_rdev = VNOVAL; vap->va_bytes = VNOVAL; vap->va_vaflags = 0; } #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof(arr[0])) #define ARRAY_PRINT(idx, arr) \ ((idx) > 0 && (idx) < ARRAY_SIZE(arr) ? (arr)[(idx)] : "UNKNOWN") const char * const vnode_tags[] = { VNODE_TAGS }; const char * const vnode_types[] = { VNODE_TYPES }; const char vnode_flagbits[] = VNODE_FLAGBITS; /* * Print out a description of a vnode. */ void vprint(const char *label, struct vnode *vp) { char bf[96]; int flag; flag = vp->v_iflag | vp->v_vflag | vp->v_uflag; bitmask_snprintf(flag, vnode_flagbits, bf, sizeof(bf)); if (label != NULL) printf("%s: ", label); printf("vnode @ %p, flags (%s)\n\ttag %s(%d), type %s(%d), " "usecount %d, writecount %d, holdcount %d\n" "\tfreelisthd %p, mount %p, data %p\n", vp, bf, ARRAY_PRINT(vp->v_tag, vnode_tags), vp->v_tag, ARRAY_PRINT(vp->v_type, vnode_types), vp->v_type, vp->v_usecount, vp->v_writecount, vp->v_holdcnt, vp->v_freelisthd, vp->v_mount, vp->v_data); if (vp->v_data != NULL) { printf("\t"); VOP_PRINT(vp); } } #ifdef DEBUG /* * List all of the locked vnodes in the system. * Called when debugging the kernel. */ void printlockedvnodes(void) { struct mount *mp, *nmp; struct vnode *vp; printf("Locked vnodes\n"); mutex_enter(&mountlist_lock); for (mp = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist; mp = nmp) { if (vfs_busy(mp, LK_NOWAIT, &mountlist_lock)) { nmp = CIRCLEQ_NEXT(mp, mnt_list); continue; } TAILQ_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { if (VOP_ISLOCKED(vp)) vprint(NULL, vp); } mutex_enter(&mountlist_lock); nmp = CIRCLEQ_NEXT(mp, mnt_list); vfs_unbusy(mp); } mutex_exit(&mountlist_lock); } #endif /* * 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, kauth_cred_t cred) { mode_t mask; int error, ismember; /* * Super-user always gets read/write access, but execute access depends * on at least one execute bit being set. */ if (kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, NULL) == 0) { 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 (kauth_cred_geteuid(cred) == 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. */ error = kauth_cred_ismember_gid(cred, gid, &ismember); if (error) return (error); if (kauth_cred_getegid(cred) == gid || ismember) { 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); } /* * Given a file system name, look up the vfsops for that * file system, or return NULL if file system isn't present * in the kernel. */ struct vfsops * vfs_getopsbyname(const char *name) { struct vfsops *v; mutex_enter(&vfs_list_lock); LIST_FOREACH(v, &vfs_list, vfs_list) { if (strcmp(v->vfs_name, name) == 0) break; } if (v != NULL) v->vfs_refcount++; mutex_exit(&vfs_list_lock); return (v); } void copy_statvfs_info(struct statvfs *sbp, const struct mount *mp) { const struct statvfs *mbp; if (sbp == (mbp = &mp->mnt_stat)) return; (void)memcpy(&sbp->f_fsidx, &mbp->f_fsidx, sizeof(sbp->f_fsidx)); sbp->f_fsid = mbp->f_fsid; sbp->f_owner = mbp->f_owner; sbp->f_flag = mbp->f_flag; sbp->f_syncwrites = mbp->f_syncwrites; sbp->f_asyncwrites = mbp->f_asyncwrites; sbp->f_syncreads = mbp->f_syncreads; sbp->f_asyncreads = mbp->f_asyncreads; (void)memcpy(sbp->f_spare, mbp->f_spare, sizeof(mbp->f_spare)); (void)memcpy(sbp->f_fstypename, mbp->f_fstypename, sizeof(sbp->f_fstypename)); (void)memcpy(sbp->f_mntonname, mbp->f_mntonname, sizeof(sbp->f_mntonname)); (void)memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, sizeof(sbp->f_mntfromname)); sbp->f_namemax = mbp->f_namemax; } int set_statvfs_info(const char *onp, int ukon, const char *fromp, int ukfrom, const char *vfsname, struct mount *mp, struct lwp *l) { int error; size_t size; struct statvfs *sfs = &mp->mnt_stat; int (*fun)(const void *, void *, size_t, size_t *); (void)strlcpy(mp->mnt_stat.f_fstypename, vfsname, sizeof(mp->mnt_stat.f_fstypename)); if (onp) { struct cwdinfo *cwdi = l->l_proc->p_cwdi; fun = (ukon == UIO_SYSSPACE) ? copystr : copyinstr; if (cwdi->cwdi_rdir != NULL) { size_t len; char *bp; char *path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); if (!path) /* XXX can't happen with M_WAITOK */ return ENOMEM; bp = path + MAXPATHLEN; *--bp = '\0'; rw_enter(&cwdi->cwdi_lock, RW_READER); error = getcwd_common(cwdi->cwdi_rdir, rootvnode, &bp, path, MAXPATHLEN / 2, 0, l); rw_exit(&cwdi->cwdi_lock); if (error) { free(path, M_TEMP); return error; } len = strlen(bp); if (len > sizeof(sfs->f_mntonname) - 1) len = sizeof(sfs->f_mntonname) - 1; (void)strncpy(sfs->f_mntonname, bp, len); free(path, M_TEMP); if (len < sizeof(sfs->f_mntonname) - 1) { error = (*fun)(onp, &sfs->f_mntonname[len], sizeof(sfs->f_mntonname) - len - 1, &size); if (error) return error; size += len; } else { size = len; } } else { error = (*fun)(onp, &sfs->f_mntonname, sizeof(sfs->f_mntonname) - 1, &size); if (error) return error; } (void)memset(sfs->f_mntonname + size, 0, sizeof(sfs->f_mntonname) - size); } if (fromp) { fun = (ukfrom == UIO_SYSSPACE) ? copystr : copyinstr; error = (*fun)(fromp, sfs->f_mntfromname, sizeof(sfs->f_mntfromname) - 1, &size); if (error) return error; (void)memset(sfs->f_mntfromname + size, 0, sizeof(sfs->f_mntfromname) - size); } return 0; } void vfs_timestamp(struct timespec *ts) { nanotime(ts); } time_t rootfstime; /* recorded root fs time, if known */ void setrootfstime(time_t t) { rootfstime = t; } /* * mount_specific_key_create -- * Create a key for subsystem mount-specific data. */ int mount_specific_key_create(specificdata_key_t *keyp, specificdata_dtor_t dtor) { return (specificdata_key_create(mount_specificdata_domain, keyp, dtor)); } /* * mount_specific_key_delete -- * Delete a key for subsystem mount-specific data. */ void mount_specific_key_delete(specificdata_key_t key) { specificdata_key_delete(mount_specificdata_domain, key); } /* * mount_initspecific -- * Initialize a mount's specificdata container. */ void mount_initspecific(struct mount *mp) { int error; error = specificdata_init(mount_specificdata_domain, &mp->mnt_specdataref); KASSERT(error == 0); } /* * mount_finispecific -- * Finalize a mount's specificdata container. */ void mount_finispecific(struct mount *mp) { specificdata_fini(mount_specificdata_domain, &mp->mnt_specdataref); } /* * mount_getspecific -- * Return mount-specific data corresponding to the specified key. */ void * mount_getspecific(struct mount *mp, specificdata_key_t key) { return (specificdata_getspecific(mount_specificdata_domain, &mp->mnt_specdataref, key)); } /* * mount_setspecific -- * Set mount-specific data corresponding to the specified key. */ void mount_setspecific(struct mount *mp, specificdata_key_t key, void *data) { specificdata_setspecific(mount_specificdata_domain, &mp->mnt_specdataref, key, data); } int VFS_MOUNT(struct mount *mp, const char *a, void *b, size_t *c) { int error; KERNEL_LOCK(1, NULL); error = (*(mp->mnt_op->vfs_mount))(mp, a, b, c); KERNEL_UNLOCK_ONE(NULL); return error; } int VFS_START(struct mount *mp, int a) { int error; if ((mp->mnt_iflag & IMNT_MPSAFE) == 0) { KERNEL_LOCK(1, NULL); } error = (*(mp->mnt_op->vfs_start))(mp, a); if ((mp->mnt_iflag & IMNT_MPSAFE) == 0) { KERNEL_UNLOCK_ONE(NULL); } return error; } int VFS_UNMOUNT(struct mount *mp, int a) { int error; KERNEL_LOCK(1, NULL); error = (*(mp->mnt_op->vfs_unmount))(mp, a); KERNEL_UNLOCK_ONE(NULL); return error; } int VFS_ROOT(struct mount *mp, struct vnode **a) { int error; if ((mp->mnt_iflag & IMNT_MPSAFE) == 0) { KERNEL_LOCK(1, NULL); } error = (*(mp->mnt_op->vfs_root))(mp, a); if ((mp->mnt_iflag & IMNT_MPSAFE) == 0) { KERNEL_UNLOCK_ONE(NULL); } return error; } int VFS_QUOTACTL(struct mount *mp, int a, uid_t b, void *c) { int error; if ((mp->mnt_iflag & IMNT_MPSAFE) == 0) { KERNEL_LOCK(1, NULL); } error = (*(mp->mnt_op->vfs_quotactl))(mp, a, b, c); if ((mp->mnt_iflag & IMNT_MPSAFE) == 0) { KERNEL_UNLOCK_ONE(NULL); } return error; } int VFS_STATVFS(struct mount *mp, struct statvfs *a) { int error; if ((mp->mnt_iflag & IMNT_MPSAFE) == 0) { KERNEL_LOCK(1, NULL); } error = (*(mp->mnt_op->vfs_statvfs))(mp, a); if ((mp->mnt_iflag & IMNT_MPSAFE) == 0) { KERNEL_UNLOCK_ONE(NULL); } return error; } int VFS_SYNC(struct mount *mp, int a, struct kauth_cred *b) { int error; if ((mp->mnt_iflag & IMNT_MPSAFE) == 0) { KERNEL_LOCK(1, NULL); } error = (*(mp->mnt_op->vfs_sync))(mp, a, b); if ((mp->mnt_iflag & IMNT_MPSAFE) == 0) { KERNEL_UNLOCK_ONE(NULL); } return error; } int VFS_FHTOVP(struct mount *mp, struct fid *a, struct vnode **b) { int error; if ((mp->mnt_iflag & IMNT_MPSAFE) == 0) { KERNEL_LOCK(1, NULL); } error = (*(mp->mnt_op->vfs_fhtovp))(mp, a, b); if ((mp->mnt_iflag & IMNT_MPSAFE) == 0) { KERNEL_UNLOCK_ONE(NULL); } return error; } int VFS_VPTOFH(struct vnode *vp, struct fid *a, size_t *b) { int error; if ((vp->v_vflag & VV_MPSAFE) == 0) { KERNEL_LOCK(1, NULL); } error = (*(vp->v_mount->mnt_op->vfs_vptofh))(vp, a, b); if ((vp->v_vflag & VV_MPSAFE) == 0) { KERNEL_UNLOCK_ONE(NULL); } return error; } int VFS_SNAPSHOT(struct mount *mp, struct vnode *a, struct timespec *b) { int error; if ((mp->mnt_iflag & IMNT_MPSAFE) == 0) { KERNEL_LOCK(1, NULL); } error = (*(mp->mnt_op->vfs_snapshot))(mp, a, b); if ((mp->mnt_iflag & IMNT_MPSAFE) == 0) { KERNEL_UNLOCK_ONE(NULL); } return error; } int VFS_EXTATTRCTL(struct mount *mp, int a, struct vnode *b, int c, const char *d) { int error; KERNEL_LOCK(1, NULL); /* XXXSMP check ffs */ error = (*(mp->mnt_op->vfs_extattrctl))(mp, a, b, c, d); KERNEL_UNLOCK_ONE(NULL); /* XXX */ return error; } int VFS_SUSPENDCTL(struct mount *mp, int a) { int error; if ((mp->mnt_iflag & IMNT_MPSAFE) == 0) { KERNEL_LOCK(1, NULL); } error = (*(mp->mnt_op->vfs_suspendctl))(mp, a); if ((mp->mnt_iflag & IMNT_MPSAFE) == 0) { KERNEL_UNLOCK_ONE(NULL); } return error; } #ifdef DDB static const char buf_flagbits[] = BUF_FLAGBITS; void vfs_buf_print(struct buf *bp, int full, void (*pr)(const char *, ...)) { char bf[1024]; (*pr)(" vp %p lblkno 0x%"PRIx64" blkno 0x%"PRIx64" rawblkno 0x%" PRIx64 " dev 0x%x\n", bp->b_vp, bp->b_lblkno, bp->b_blkno, bp->b_rawblkno, bp->b_dev); bitmask_snprintf(bp->b_flags | bp->b_oflags | bp->b_cflags, buf_flagbits, bf, sizeof(bf)); (*pr)(" error %d flags 0x%s\n", bp->b_error, bf); (*pr)(" bufsize 0x%lx bcount 0x%lx resid 0x%lx\n", bp->b_bufsize, bp->b_bcount, bp->b_resid); (*pr)(" data %p saveaddr %p dep %p\n", bp->b_data, bp->b_saveaddr, LIST_FIRST(&bp->b_dep)); (*pr)(" iodone %p objlock %p\n", bp->b_iodone, bp->b_objlock); } void vfs_vnode_print(struct vnode *vp, int full, void (*pr)(const char *, ...)) { char bf[256]; uvm_object_printit(&vp->v_uobj, full, pr); bitmask_snprintf(vp->v_iflag | vp->v_vflag | vp->v_uflag, vnode_flagbits, bf, sizeof(bf)); (*pr)("\nVNODE flags %s\n", bf); (*pr)("mp %p numoutput %d size 0x%llx writesize 0x%llx\n", vp->v_mount, vp->v_numoutput, vp->v_size, vp->v_writesize); (*pr)("data %p writecount %ld holdcnt %ld\n", vp->v_data, vp->v_writecount, vp->v_holdcnt); (*pr)("tag %s(%d) type %s(%d) mount %p typedata %p\n", ARRAY_PRINT(vp->v_tag, vnode_tags), vp->v_tag, ARRAY_PRINT(vp->v_type, vnode_types), vp->v_type, vp->v_mount, vp->v_mountedhere); 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, void (*pr)(const char *, ...)) { char sbuf[256]; (*pr)("vnodecovered = %p syncer = %p data = %p\n", mp->mnt_vnodecovered,mp->mnt_syncer,mp->mnt_data); (*pr)("fs_bshift %d dev_bshift = %d\n", mp->mnt_fs_bshift,mp->mnt_dev_bshift); bitmask_snprintf(mp->mnt_flag, __MNT_FLAG_BITS, sbuf, sizeof(sbuf)); (*pr)("flag = %s\n", sbuf); bitmask_snprintf(mp->mnt_iflag, __IMNT_FLAG_BITS, sbuf, sizeof(sbuf)); (*pr)("iflag = %s\n", sbuf); /* XXX use lockmgr_printinfo */ if (mp->mnt_lock.lk_sharecount) (*pr)(" lock type %s: SHARED (count %d)", mp->mnt_lock.lk_wmesg, mp->mnt_lock.lk_sharecount); else if (mp->mnt_lock.lk_flags & LK_HAVE_EXCL) { (*pr)(" lock type %s: EXCL (count %d) by ", mp->mnt_lock.lk_wmesg, mp->mnt_lock.lk_exclusivecount); (*pr)("pid %d.%d", mp->mnt_lock.lk_lockholder, mp->mnt_lock.lk_locklwp); } else (*pr)(" not locked"); if (mp->mnt_lock.lk_waitcount > 0) (*pr)(" with %d pending", mp->mnt_lock.lk_waitcount); (*pr)("\n"); if (mp->mnt_unmounter) { (*pr)("unmounter pid = %d ",mp->mnt_unmounter->l_proc); } (*pr)("statvfs cache:\n"); (*pr)("\tbsize = %lu\n",mp->mnt_stat.f_bsize); (*pr)("\tfrsize = %lu\n",mp->mnt_stat.f_frsize); (*pr)("\tiosize = %lu\n",mp->mnt_stat.f_iosize); (*pr)("\tblocks = %"PRIu64"\n",mp->mnt_stat.f_blocks); (*pr)("\tbfree = %"PRIu64"\n",mp->mnt_stat.f_bfree); (*pr)("\tbavail = %"PRIu64"\n",mp->mnt_stat.f_bavail); (*pr)("\tbresvd = %"PRIu64"\n",mp->mnt_stat.f_bresvd); (*pr)("\tfiles = %"PRIu64"\n",mp->mnt_stat.f_files); (*pr)("\tffree = %"PRIu64"\n",mp->mnt_stat.f_ffree); (*pr)("\tfavail = %"PRIu64"\n",mp->mnt_stat.f_favail); (*pr)("\tfresvd = %"PRIu64"\n",mp->mnt_stat.f_fresvd); (*pr)("\tf_fsidx = { 0x%"PRIx32", 0x%"PRIx32" }\n", mp->mnt_stat.f_fsidx.__fsid_val[0], mp->mnt_stat.f_fsidx.__fsid_val[1]); (*pr)("\towner = %"PRIu32"\n",mp->mnt_stat.f_owner); (*pr)("\tnamemax = %lu\n",mp->mnt_stat.f_namemax); bitmask_snprintf(mp->mnt_stat.f_flag, __MNT_FLAG_BITS, sbuf, sizeof(sbuf)); (*pr)("\tflag = %s\n",sbuf); (*pr)("\tsyncwrites = %" PRIu64 "\n",mp->mnt_stat.f_syncwrites); (*pr)("\tasyncwrites = %" PRIu64 "\n",mp->mnt_stat.f_asyncwrites); (*pr)("\tsyncreads = %" PRIu64 "\n",mp->mnt_stat.f_syncreads); (*pr)("\tasyncreads = %" PRIu64 "\n",mp->mnt_stat.f_asyncreads); (*pr)("\tfstypename = %s\n",mp->mnt_stat.f_fstypename); (*pr)("\tmntonname = %s\n",mp->mnt_stat.f_mntonname); (*pr)("\tmntfromname = %s\n",mp->mnt_stat.f_mntfromname); { int cnt = 0; struct vnode *vp; (*pr)("locked vnodes ="); /* XXX would take mountlist lock, except ddb may not have context */ TAILQ_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { if (VOP_ISLOCKED(vp)) { if ((++cnt % 6) == 0) { (*pr)(" %p,\n\t", vp); } else { (*pr)(" %p,", vp); } } } (*pr)("\n"); } if (full) { int cnt = 0; struct vnode *vp; (*pr)("all vnodes ="); /* XXX would take mountlist lock, except ddb may not have context */ TAILQ_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { if (!TAILQ_NEXT(vp, v_mntvnodes)) { (*pr)(" %p", vp); } else if ((++cnt % 6) == 0) { (*pr)(" %p,\n\t", vp); } else { (*pr)(" %p,", vp); } } (*pr)("\n", vp); } } #endif /* DDB */