/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2007 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ #pragma ident "%Z%%M% %I% %E% SMI" /* * vnode ops for the devfs * * For leaf vnode special files (VCHR|VBLK) specfs will always see the VOP * first because dv_find always performs leaf vnode substitution, returning * a specfs vnode with an s_realvp pointing to the devfs leaf vnode. This * means that the only leaf special file VOP operations that devfs will see * after VOP_LOOKUP are the ones that specfs forwards. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include extern struct vattr dv_vattr_dir, dv_vattr_file; extern dev_t rconsdev; /* * Open of devices (leaf nodes) is handled by specfs. * There is nothing to do to open a directory */ /*ARGSUSED*/ static int devfs_open(struct vnode **vpp, int flag, struct cred *cred, caller_context_t *ct) { struct dv_node *dv = VTODV(*vpp); dcmn_err2(("devfs_open %s\n", dv->dv_name)); ASSERT((*vpp)->v_type == VDIR); return (0); } /* * Close of devices (leaf nodes) is handled by specfs. * There is nothing much to do inorder to close a directory. */ /*ARGSUSED1*/ static int devfs_close(struct vnode *vp, int flag, int count, offset_t offset, struct cred *cred, caller_context_t *ct) { struct dv_node *dv = VTODV(vp); dcmn_err2(("devfs_close %s\n", dv->dv_name)); ASSERT(vp->v_type == VDIR); cleanlocks(vp, ttoproc(curthread)->p_pid, 0); cleanshares(vp, ttoproc(curthread)->p_pid); return (0); } /* * Read of devices (leaf nodes) is handled by specfs. * Read of directories is not supported. */ /*ARGSUSED*/ static int devfs_read(struct vnode *vp, struct uio *uiop, int ioflag, struct cred *cred, struct caller_context *ct) { dcmn_err2(("devfs_read %s\n", VTODV(vp)->dv_name)); ASSERT(vp->v_type == VDIR); ASSERT(RW_READ_HELD(&VTODV(vp)->dv_contents)); return (EISDIR); } /* * Write of devices (leaf nodes) is handled by specfs. * Write of directories is not supported. */ /*ARGSUSED*/ static int devfs_write(struct vnode *vp, struct uio *uiop, int ioflag, struct cred *cred, struct caller_context *ct) { dcmn_err2(("devfs_write %s\n", VTODV(vp)->dv_name)); ASSERT(vp->v_type == VDIR); ASSERT(RW_WRITE_HELD(&VTODV(vp)->dv_contents)); return (EISDIR); } /* * Ioctls to device (leaf nodes) is handled by specfs. * Ioctl to directories is not supported. */ /*ARGSUSED*/ static int devfs_ioctl(struct vnode *vp, int cmd, intptr_t arg, int flag, struct cred *cred, int *rvalp, caller_context_t *ct) { dcmn_err2(("devfs_ioctl %s\n", VTODV(vp)->dv_name)); ASSERT(vp->v_type == VDIR); return (ENOTTY); /* no ioctls supported */ } /* * We can be asked directly about the attributes of directories, or * (via sp->s_realvp) about the filesystem attributes of special files. * * For directories, we just believe the attribute store * though we mangle the nodeid, fsid, and rdev to convince userland we * really are a different filesystem. * * For special files, a little more fakery is required. * * If the attribute store is not there (read only root), we believe our * memory based attributes. */ static int devfs_getattr(struct vnode *vp, struct vattr *vap, int flags, struct cred *cr, caller_context_t *ct) { struct dv_node *dv = VTODV(vp); int error = 0; uint_t mask; /* * Message goes to console only. Otherwise, the message * causes devfs_getattr to be invoked again... infinite loop */ dcmn_err2(("?devfs_getattr %s\n", dv->dv_name)); ASSERT(dv->dv_attr || dv->dv_attrvp); if (!(vp->v_type == VDIR || vp->v_type == VCHR || vp->v_type == VBLK)) { cmn_err(CE_WARN, /* panic ? */ "?%s: getattr on vnode type %d", dvnm, vp->v_type); return (ENOENT); } if (dv->dv_attr) { /* * obtain from the memory version of attribute. * preserve mask for those that optimize. * devfs specific fields are already merged on creation. */ mask = vap->va_mask; *vap = *dv->dv_attr; vap->va_mask = mask; } else { /* obtain from attribute store and merge */ error = VOP_GETATTR(dv->dv_attrvp, vap, flags, cr, ct); dsysdebug(error, ("vop_getattr %s %d\n", dv->dv_name, error)); dv_vattr_merge(dv, vap); } /* * Restrict the permissions of the node fronting the console * to 0600 with root as the owner. This prevents a non-root * user from gaining access to a serial terminal (like /dev/term/a) * which is in reality serving as the console device (/dev/console). */ if (vp->v_rdev == rconsdev) { mode_t rconsmask = S_IXUSR|S_IRWXG|S_IRWXO; vap->va_mode &= (~rconsmask); vap->va_uid = 0; } return (error); } static int devfs_unlocked_access(void *, int, struct cred *); /*ARGSUSED4*/ static int devfs_setattr_dir( struct dv_node *dv, struct vnode *vp, struct vattr *vap, int flags, struct cred *cr) { struct vattr *map; long int mask; int error = 0; struct vattr vattr; ASSERT(dv->dv_attr || dv->dv_attrvp); ASSERT(vp->v_type == VDIR); ASSERT((dv->dv_flags & DV_NO_FSPERM) == 0); if (vap->va_mask & AT_NOSET) return (EINVAL); /* to ensure consistency, single thread setting of attributes */ rw_enter(&dv->dv_contents, RW_WRITER); again: if (dv->dv_attr) { error = secpolicy_vnode_setattr(cr, vp, vap, dv->dv_attr, flags, devfs_unlocked_access, dv); if (error) goto out; /* * Apply changes to the memory based attribute. This code * is modeled after the tmpfs implementation of memory * based vnodes */ map = dv->dv_attr; mask = vap->va_mask; /* Change file access modes. */ if (mask & AT_MODE) { map->va_mode &= S_IFMT; map->va_mode |= vap->va_mode & ~S_IFMT; } if (mask & AT_UID) map->va_uid = vap->va_uid; if (mask & AT_GID) map->va_gid = vap->va_gid; if (mask & AT_ATIME) map->va_atime = vap->va_atime; if (mask & AT_MTIME) map->va_mtime = vap->va_mtime; if (mask & (AT_MODE | AT_UID | AT_GID | AT_MTIME)) gethrestime(&map->va_ctime); } else { /* use the backing attribute store */ ASSERT(dv->dv_attrvp); /* * See if we are changing something we care about * the persistence of - return success if we don't care. */ if (vap->va_mask & (AT_MODE|AT_UID|AT_GID|AT_ATIME|AT_MTIME)) { /* Set the attributes */ error = VOP_SETATTR(dv->dv_attrvp, vap, flags, cr, NULL); dsysdebug(error, ("vop_setattr %s %d\n", dv->dv_name, error)); /* * Some file systems may return EROFS for a setattr * on a readonly file system. In this case we create * our own memory based attribute. */ if (error == EROFS) { /* * obtain attributes from existing file * that we will modify and switch to memory * based attribute until attribute store is * read/write. */ vattr = dv_vattr_dir; if (VOP_GETATTR(dv->dv_attrvp, &vattr, flags, cr, NULL) == 0) { dv->dv_attr = kmem_alloc( sizeof (struct vattr), KM_SLEEP); *dv->dv_attr = vattr; dv_vattr_merge(dv, dv->dv_attr); goto again; } } } } out: rw_exit(&dv->dv_contents); return (error); } /* * Compare the uid/gid/mode changes requested for a setattr * operation with the same details of a node's default minor * perm information. Return 0 if identical. */ static int dv_setattr_cmp(struct vattr *map, mperm_t *mp) { if ((map->va_mode & S_IAMB) != (mp->mp_mode & S_IAMB)) return (1); if (map->va_uid != mp->mp_uid) return (1); if (map->va_gid != mp->mp_gid) return (1); return (0); } /*ARGSUSED4*/ static int devfs_setattr( struct vnode *vp, struct vattr *vap, int flags, struct cred *cr, caller_context_t *ct) { struct dv_node *dv = VTODV(vp); struct dv_node *ddv; struct vnode *dvp; struct vattr *map; long int mask; int error = 0; struct vattr *free_vattr = NULL; struct vattr *vattrp = NULL; mperm_t mp; int persist; /* * Message goes to console only. Otherwise, the message * causes devfs_getattr to be invoked again... infinite loop */ dcmn_err2(("?devfs_setattr %s\n", dv->dv_name)); ASSERT(dv->dv_attr || dv->dv_attrvp); if (!(vp->v_type == VDIR || vp->v_type == VCHR || vp->v_type == VBLK)) { cmn_err(CE_WARN, /* panic ? */ "?%s: getattr on vnode type %d", dvnm, vp->v_type); return (ENOENT); } if (vap->va_mask & AT_NOSET) return (EINVAL); /* * If we are changing something we don't care about * the persistence of, return success. */ if ((vap->va_mask & (AT_MODE|AT_UID|AT_GID|AT_ATIME|AT_MTIME)) == 0) return (0); /* * If driver overrides fs perm, disallow chmod * and do not create attribute nodes. */ if (dv->dv_flags & DV_NO_FSPERM) { ASSERT(dv->dv_attr); if (vap->va_mask & (AT_MODE | AT_UID | AT_GID)) return (EPERM); if ((vap->va_mask & (AT_ATIME|AT_MTIME)) == 0) return (0); rw_enter(&dv->dv_contents, RW_WRITER); if (vap->va_mask & AT_ATIME) dv->dv_attr->va_atime = vap->va_atime; if (vap->va_mask & AT_MTIME) dv->dv_attr->va_mtime = vap->va_mtime; rw_exit(&dv->dv_contents); return (0); } /* * Directories are always created but device nodes are * only used to persist non-default permissions. */ if (vp->v_type == VDIR) { ASSERT(dv->dv_attr || dv->dv_attrvp); return (devfs_setattr_dir(dv, vp, vap, flags, cr)); } /* * Allocate now before we take any locks */ vattrp = kmem_zalloc(sizeof (*vattrp), KM_SLEEP); /* to ensure consistency, single thread setting of attributes */ rw_enter(&dv->dv_contents, RW_WRITER); /* * We don't need to create an attribute node * to persist access or modification times. */ persist = (vap->va_mask & (AT_MODE | AT_UID | AT_GID)); /* * If persisting something, get the default permissions * for this minor to compare against what the attributes * are now being set to. Default ordering is: * - minor_perm match for this minor * - mode supplied by ddi_create_priv_minor_node * - devfs defaults */ if (persist) { if (dev_minorperm(dv->dv_devi, dv->dv_name, &mp) != 0) { mp.mp_uid = dv_vattr_file.va_uid; mp.mp_gid = dv_vattr_file.va_gid; mp.mp_mode = dv_vattr_file.va_mode; if (dv->dv_flags & DV_DFLT_MODE) { ASSERT((dv->dv_dflt_mode & ~S_IAMB) == 0); mp.mp_mode &= ~S_IAMB; mp.mp_mode |= dv->dv_dflt_mode; dcmn_err5(("%s: setattr priv default 0%o\n", dv->dv_name, mp.mp_mode)); } else { dcmn_err5(("%s: setattr devfs default 0%o\n", dv->dv_name, mp.mp_mode)); } } else { dcmn_err5(("%s: setattr minor perm default 0%o\n", dv->dv_name, mp.mp_mode)); } } /* * If we don't have a vattr for this node, construct one. */ if (dv->dv_attr) { free_vattr = vattrp; vattrp = NULL; } else { ASSERT(dv->dv_attrvp); ASSERT(vp->v_type != VDIR); *vattrp = dv_vattr_file; error = VOP_GETATTR(dv->dv_attrvp, vattrp, 0, cr, ct); dsysdebug(error, ("vop_getattr %s %d\n", dv->dv_name, error)); if (error) goto out; dv->dv_attr = vattrp; dv_vattr_merge(dv, dv->dv_attr); vattrp = NULL; } error = secpolicy_vnode_setattr(cr, vp, vap, dv->dv_attr, flags, devfs_unlocked_access, dv); if (error) { dsysdebug(error, ("devfs_setattr %s secpolicy error %d\n", dv->dv_name, error)); goto out; } /* * Apply changes to the memory based attribute. This code * is modeled after the tmpfs implementation of memory * based vnodes */ map = dv->dv_attr; mask = vap->va_mask; /* Change file access modes. */ if (mask & AT_MODE) { map->va_mode &= S_IFMT; map->va_mode |= vap->va_mode & ~S_IFMT; } if (mask & AT_UID) map->va_uid = vap->va_uid; if (mask & AT_GID) map->va_gid = vap->va_gid; if (mask & AT_ATIME) map->va_atime = vap->va_atime; if (mask & AT_MTIME) map->va_mtime = vap->va_mtime; if (mask & (AT_MODE | AT_UID | AT_GID | AT_MTIME)) { gethrestime(&map->va_ctime); } /* * A setattr to defaults means we no longer need the * shadow node as a persistent store, unless there * are ACLs. Otherwise create a shadow node if one * doesn't exist yet. */ if (persist) { if ((dv_setattr_cmp(map, &mp) == 0) && ((dv->dv_flags & DV_ACL) == 0)) { if (dv->dv_attrvp) { ddv = dv->dv_dotdot; ASSERT(ddv->dv_attrvp); error = VOP_REMOVE(ddv->dv_attrvp, dv->dv_name, cr, ct, 0); dsysdebug(error, ("vop_remove %s %s %d\n", ddv->dv_name, dv->dv_name, error)); if (error == EROFS) error = 0; VN_RELE(dv->dv_attrvp); dv->dv_attrvp = NULL; } ASSERT(dv->dv_attr); } else { if (mask & AT_MODE) dcmn_err5(("%s persisting mode 0%o\n", dv->dv_name, vap->va_mode)); if (mask & AT_UID) dcmn_err5(("%s persisting uid %d\n", dv->dv_name, vap->va_uid)); if (mask & AT_GID) dcmn_err5(("%s persisting gid %d\n", dv->dv_name, vap->va_gid)); if (dv->dv_attrvp == NULL) { dvp = DVTOV(dv->dv_dotdot); dv_shadow_node(dvp, dv->dv_name, vp, NULL, NULLVP, cr, DV_SHADOW_CREATE | DV_SHADOW_WRITE_HELD); } if (dv->dv_attrvp) { error = VOP_SETATTR(dv->dv_attrvp, vap, flags, cr, NULL); dsysdebug(error, ("vop_setattr %s %d\n", dv->dv_name, error)); } /* * Some file systems may return EROFS for a setattr * on a readonly file system. In this case save * as our own memory based attribute. * NOTE: ufs is NOT one of these (see ufs_iupdat). */ if (dv->dv_attr && dv->dv_attrvp && error == 0) { vattrp = dv->dv_attr; dv->dv_attr = NULL; } else if (error == EROFS) error = 0; } } out: rw_exit(&dv->dv_contents); if (vattrp) kmem_free(vattrp, sizeof (*vattrp)); if (free_vattr) kmem_free(free_vattr, sizeof (*free_vattr)); return (error); } static int devfs_pathconf(vnode_t *vp, int cmd, ulong_t *valp, cred_t *cr, caller_context_t *ct) { switch (cmd) { case _PC_ACL_ENABLED: /* * We rely on the underlying filesystem for ACLs, * so direct the query for ACL support there. * ACL support isn't relative to the file * and we can't guarantee that the dv node * has an attribute node, so any valid * attribute node will suffice. */ ASSERT(dvroot); ASSERT(dvroot->dv_attrvp); return (VOP_PATHCONF(dvroot->dv_attrvp, cmd, valp, cr, ct)); /*NOTREACHED*/ } return (fs_pathconf(vp, cmd, valp, cr, ct)); } /* * Let avp handle security attributes (acl's). */ static int devfs_getsecattr(struct vnode *vp, struct vsecattr *vsap, int flags, struct cred *cr, caller_context_t *ct) { dvnode_t *dv = VTODV(vp); struct vnode *avp; int error; dcmn_err2(("devfs_getsecattr %s\n", dv->dv_name)); ASSERT(vp->v_type == VDIR || vp->v_type == VCHR || vp->v_type == VBLK); rw_enter(&dv->dv_contents, RW_READER); avp = dv->dv_attrvp; /* fabricate the acl */ if (avp == NULL) { error = fs_fab_acl(vp, vsap, flags, cr, ct); rw_exit(&dv->dv_contents); return (error); } error = VOP_GETSECATTR(avp, vsap, flags, cr, ct); dsysdebug(error, ("vop_getsecattr %s %d\n", VTODV(vp)->dv_name, error)); rw_exit(&dv->dv_contents); return (error); } /* * Set security attributes (acl's) * * Note that the dv_contents lock has already been acquired * by the caller's VOP_RWLOCK. */ static int devfs_setsecattr(struct vnode *vp, struct vsecattr *vsap, int flags, struct cred *cr, caller_context_t *ct) { dvnode_t *dv = VTODV(vp); struct vnode *avp; int error; dcmn_err2(("devfs_setsecattr %s\n", dv->dv_name)); ASSERT(vp->v_type == VDIR || vp->v_type == VCHR || vp->v_type == VBLK); ASSERT(RW_LOCK_HELD(&dv->dv_contents)); /* * Not a supported operation on drivers not providing * file system based permissions. */ if (dv->dv_flags & DV_NO_FSPERM) return (ENOTSUP); /* * To complete, the setsecattr requires an underlying attribute node. */ if (dv->dv_attrvp == NULL) { ASSERT(vp->v_type == VCHR || vp->v_type == VBLK); dv_shadow_node(DVTOV(dv->dv_dotdot), dv->dv_name, vp, NULL, NULLVP, cr, DV_SHADOW_CREATE | DV_SHADOW_WRITE_HELD); } if ((avp = dv->dv_attrvp) == NULL) { dcmn_err2(("devfs_setsecattr %s: " "cannot construct attribute node\n", dv->dv_name)); return (fs_nosys()); } /* * The acl(2) system call issues a VOP_RWLOCK before setting an ACL. * Since backing file systems expect the lock to be held before seeing * a VOP_SETSECATTR ACL, we need to issue the VOP_RWLOCK to the backing * store before forwarding the ACL. */ (void) VOP_RWLOCK(avp, V_WRITELOCK_TRUE, NULL); error = VOP_SETSECATTR(avp, vsap, flags, cr, ct); dsysdebug(error, ("vop_setsecattr %s %d\n", VTODV(vp)->dv_name, error)); VOP_RWUNLOCK(avp, V_WRITELOCK_TRUE, NULL); /* * Set DV_ACL if we have a non-trivial set of ACLs. It is not * necessary to hold VOP_RWLOCK since fs_acl_nontrivial only does * VOP_GETSECATTR calls. */ if (fs_acl_nontrivial(avp, cr)) dv->dv_flags |= DV_ACL; return (error); } /* * This function is used for secpolicy_setattr(). It must call an * access() like function while it is already holding the * dv_contents lock. We only care about this when dv_attr != NULL; * so the unlocked access call only concerns itself with that * particular branch of devfs_access(). */ static int devfs_unlocked_access(void *vdv, int mode, struct cred *cr) { struct dv_node *dv = vdv; int shift = 0; uid_t owner = dv->dv_attr->va_uid; /* Check access based on owner, group and public permissions. */ if (crgetuid(cr) != owner) { shift += 3; if (groupmember(dv->dv_attr->va_gid, cr) == 0) shift += 3; } /* compute missing mode bits */ mode &= ~(dv->dv_attr->va_mode << shift); if (mode == 0) return (0); return (secpolicy_vnode_access(cr, DVTOV(dv), owner, mode)); } static int devfs_access(struct vnode *vp, int mode, int flags, struct cred *cr, caller_context_t *ct) { struct dv_node *dv = VTODV(vp); int res; dcmn_err2(("devfs_access %s\n", dv->dv_name)); ASSERT(dv->dv_attr || dv->dv_attrvp); /* restrict console access to privileged processes */ if ((vp->v_rdev == rconsdev) && secpolicy_console(cr) != 0) { return (EACCES); } if (dv->dv_attr && ((dv->dv_flags & DV_ACL) == 0)) { rw_enter(&dv->dv_contents, RW_READER); if (dv->dv_attr) { res = devfs_unlocked_access(dv, mode, cr); rw_exit(&dv->dv_contents); return (res); } rw_exit(&dv->dv_contents); } return (VOP_ACCESS(dv->dv_attrvp, mode, flags, cr, ct)); } /* * Lookup * * Given the directory vnode and the name of the component, return * the corresponding held vnode for that component. * * Of course in these fictional filesystems, nothing's ever quite * -that- simple. * * devfs name type shadow (fs attributes) type comments * ------------------------------------------------------------------------- * drv[@addr] VDIR drv[@addr] VDIR nexus driver * drv[@addr]:m VCHR/VBLK drv[@addr]:m VREG leaf driver * drv[@addr] VCHR/VBLK drv[@addr]:.default VREG leaf driver * ------------------------------------------------------------------------- * * The following names are reserved for the attribute filesystem (which * could easily be another layer on top of this one - we simply need to * hold the vnode of the thing we're looking at) * * attr name type shadow (fs attributes) type comments * ------------------------------------------------------------------------- * drv[@addr] VDIR - - attribute dir * minorname VDIR - - minorname * attribute VREG - - attribute * ------------------------------------------------------------------------- * * Examples: * * devfs:/devices/.../mm@0:zero VCHR * shadow:/.devices/.../mm@0:zero VREG, fs attrs * devfs:/devices/.../mm@0:/zero/attr VREG, driver attribute * * devfs:/devices/.../sd@0,0:a VBLK * shadow:/.devices/.../sd@0,0:a VREG, fs attrs * devfs:/devices/.../sd@0,0:/a/.type VREG, "ddi_block:chan" * * devfs:/devices/.../mm@0 VCHR * shadow:/.devices/.../mm@0:.default VREG, fs attrs * devfs:/devices/.../mm@0:/.default/attr VREG, driver attribute * devfs:/devices/.../mm@0:/.default/.type VREG, "ddi_pseudo" * * devfs:/devices/.../obio VDIR * shadow:/devices/.../obio VDIR, needed for fs attrs. * devfs:/devices/.../obio:/.default/attr VDIR, driver attribute * * We also need to be able deal with "old" devices that have gone away, * though I think that provided we return them with readdir, they can * be removed (i.e. they don't have to respond to lookup, though it might * be weird if they didn't ;-) * * Lookup has side-effects. * * - It will create directories and fs attribute files in the shadow hierarchy. * - It should cause non-SID devices to be probed (ask the parent nexi). */ /*ARGSUSED3*/ static int devfs_lookup(struct vnode *dvp, char *nm, struct vnode **vpp, struct pathname *pnp, int flags, struct vnode *rdir, struct cred *cred, caller_context_t *ct, int *direntflags, pathname_t *realpnp) { ASSERT(dvp->v_type == VDIR); dcmn_err2(("devfs_lookup: %s\n", nm)); return (dv_find(VTODV(dvp), nm, vpp, pnp, rdir, cred, 0)); } /* * devfs nodes can't really be created directly by userland - however, * we do allow creates to find existing nodes: * * - any create fails if the node doesn't exist - EROFS. * - creating an existing directory read-only succeeds, otherwise EISDIR. * - exclusive creates fail if the node already exists - EEXIST. * - failure to create the snode for an existing device - ENOSYS. */ /*ARGSUSED2*/ static int devfs_create(struct vnode *dvp, char *nm, struct vattr *vap, vcexcl_t excl, int mode, struct vnode **vpp, struct cred *cred, int flag, caller_context_t *ct, vsecattr_t *vsecp) { int error; struct vnode *vp; dcmn_err2(("devfs_create %s\n", nm)); error = dv_find(VTODV(dvp), nm, &vp, NULL, NULLVP, cred, 0); if (error == 0) { if (excl == EXCL) error = EEXIST; else if (vp->v_type == VDIR && (mode & VWRITE)) error = EISDIR; else error = VOP_ACCESS(vp, mode, 0, cred, ct); if (error) { VN_RELE(vp); } else *vpp = vp; } else if (error == ENOENT) error = EROFS; return (error); } /* * If DV_BUILD is set, we call into nexus driver to do a BUS_CONFIG_ALL. * Otherwise, simply return cached dv_node's. Hotplug code always call * devfs_clean() to invalid the dv_node cache. */ /*ARGSUSED5*/ static int devfs_readdir(struct vnode *dvp, struct uio *uiop, struct cred *cred, int *eofp, caller_context_t *ct, int flags) { struct dv_node *ddv, *dv; struct dirent64 *de, *bufp; offset_t diroff; offset_t soff; size_t reclen, movesz; int error; struct vattr va; size_t bufsz; ddv = VTODV(dvp); dcmn_err2(("devfs_readdir %s: offset %lld len %ld\n", ddv->dv_name, uiop->uio_loffset, uiop->uio_iov->iov_len)); ASSERT(ddv->dv_attr || ddv->dv_attrvp); ASSERT(RW_READ_HELD(&ddv->dv_contents)); if (uiop->uio_loffset >= MAXOFF_T) { if (eofp) *eofp = 1; return (0); } if (uiop->uio_iovcnt != 1) return (EINVAL); if (dvp->v_type != VDIR) return (ENOTDIR); /* Load the initial contents */ if (ddv->dv_flags & DV_BUILD) { if (!rw_tryupgrade(&ddv->dv_contents)) { rw_exit(&ddv->dv_contents); rw_enter(&ddv->dv_contents, RW_WRITER); } /* recheck and fill */ if (ddv->dv_flags & DV_BUILD) dv_filldir(ddv); rw_downgrade(&ddv->dv_contents); } soff = uiop->uio_loffset; bufsz = uiop->uio_iov->iov_len; de = bufp = kmem_alloc(bufsz, KM_SLEEP); movesz = 0; dv = (struct dv_node *)-1; /* * Move as many entries into the uio structure as it will take. * Special case "." and "..". */ diroff = 0; if (soff == 0) { /* . */ reclen = DIRENT64_RECLEN(strlen(".")); if ((movesz + reclen) > bufsz) goto full; de->d_ino = (ino64_t)ddv->dv_ino; de->d_off = (off64_t)diroff + 1; de->d_reclen = (ushort_t)reclen; /* use strncpy(9f) to zero out uninitialized bytes */ (void) strncpy(de->d_name, ".", DIRENT64_NAMELEN(reclen)); movesz += reclen; de = (dirent64_t *)(intptr_t)((char *)de + reclen); dcmn_err3(("devfs_readdir: A: diroff %lld, soff %lld: '%s' " "reclen %lu\n", diroff, soff, ".", reclen)); } diroff++; if (soff <= 1) { /* .. */ reclen = DIRENT64_RECLEN(strlen("..")); if ((movesz + reclen) > bufsz) goto full; de->d_ino = (ino64_t)ddv->dv_dotdot->dv_ino; de->d_off = (off64_t)diroff + 1; de->d_reclen = (ushort_t)reclen; /* use strncpy(9f) to zero out uninitialized bytes */ (void) strncpy(de->d_name, "..", DIRENT64_NAMELEN(reclen)); movesz += reclen; de = (dirent64_t *)(intptr_t)((char *)de + reclen); dcmn_err3(("devfs_readdir: B: diroff %lld, soff %lld: '%s' " "reclen %lu\n", diroff, soff, "..", reclen)); } diroff++; for (dv = ddv->dv_dot; dv; dv = dv->dv_next, diroff++) { /* * although DDM_INTERNAL_PATH minor nodes are skipped for * readdirs outside the kernel, they still occupy directory * offsets */ if (diroff < soff || ((dv->dv_flags & DV_INTERNAL) && (cred != kcred))) continue; reclen = DIRENT64_RECLEN(strlen(dv->dv_name)); if ((movesz + reclen) > bufsz) { dcmn_err3(("devfs_readdir: C: diroff " "%lld, soff %lld: '%s' reclen %lu\n", diroff, soff, dv->dv_name, reclen)); goto full; } de->d_ino = (ino64_t)dv->dv_ino; de->d_off = (off64_t)diroff + 1; de->d_reclen = (ushort_t)reclen; /* use strncpy(9f) to zero out uninitialized bytes */ ASSERT(strlen(dv->dv_name) + 1 <= DIRENT64_NAMELEN(reclen)); (void) strncpy(de->d_name, dv->dv_name, DIRENT64_NAMELEN(reclen)); movesz += reclen; de = (dirent64_t *)(intptr_t)((char *)de + reclen); dcmn_err4(("devfs_readdir: D: diroff " "%lld, soff %lld: '%s' reclen %lu\n", diroff, soff, dv->dv_name, reclen)); } /* the buffer is full, or we exhausted everything */ full: dcmn_err3(("devfs_readdir: moving %lu bytes: " "diroff %lld, soff %lld, dv %p\n", movesz, diroff, soff, (void *)dv)); if ((movesz == 0) && dv) error = EINVAL; /* cannot be represented */ else { error = uiomove(bufp, movesz, UIO_READ, uiop); if (error == 0) { if (eofp) *eofp = dv ? 0 : 1; uiop->uio_loffset = diroff; } va.va_mask = AT_ATIME; gethrestime(&va.va_atime); rw_exit(&ddv->dv_contents); (void) devfs_setattr(dvp, &va, 0, cred, ct); rw_enter(&ddv->dv_contents, RW_READER); } kmem_free(bufp, bufsz); return (error); } /*ARGSUSED*/ static int devfs_fsync(struct vnode *vp, int syncflag, struct cred *cred, caller_context_t *ct) { /* * Message goes to console only. Otherwise, the message * causes devfs_fsync to be invoked again... infinite loop */ dcmn_err2(("devfs_fsync %s\n", VTODV(vp)->dv_name)); return (0); } /* * Normally, we leave the dv_node here at count of 0. * The node will be destroyed when dv_cleandir() is called. * * Stale dv_node's are already unlinked from the fs tree, * so dv_cleandir() won't find them. We destroy such nodes * immediately. */ /*ARGSUSED1*/ static void devfs_inactive(struct vnode *vp, struct cred *cred, caller_context_t *ct) { int destroy; struct dv_node *dv = VTODV(vp); dcmn_err2(("devfs_inactive: %s\n", dv->dv_name)); mutex_enter(&vp->v_lock); ASSERT(vp->v_count >= 1); --vp->v_count; destroy = (DV_STALE(dv) && vp->v_count == 0); mutex_exit(&vp->v_lock); /* stale nodes cannot be rediscovered, destroy it here */ if (destroy) dv_destroy(dv, 0); } /* * XXX Why do we need this? NFS mounted /dev directories? * XXX Talk to peter staubach about this. */ /*ARGSUSED2*/ static int devfs_fid(struct vnode *vp, struct fid *fidp, caller_context_t *ct) { struct dv_node *dv = VTODV(vp); struct dv_fid *dv_fid; if (fidp->fid_len < (sizeof (struct dv_fid) - sizeof (ushort_t))) { fidp->fid_len = sizeof (struct dv_fid) - sizeof (ushort_t); return (ENOSPC); } dv_fid = (struct dv_fid *)fidp; bzero(dv_fid, sizeof (struct dv_fid)); dv_fid->dvfid_len = (int)sizeof (struct dv_fid) - sizeof (ushort_t); dv_fid->dvfid_ino = dv->dv_ino; /* dv_fid->dvfid_gen = dv->tn_gen; XXX ? */ return (0); } /* * This pair of routines bracket all VOP_READ, VOP_WRITE * and VOP_READDIR requests. The contents lock stops things * moving around while we're looking at them. * * Also used by file and record locking. */ /*ARGSUSED2*/ static int devfs_rwlock(struct vnode *vp, int write_flag, caller_context_t *ct) { dcmn_err2(("devfs_rwlock %s\n", VTODV(vp)->dv_name)); rw_enter(&VTODV(vp)->dv_contents, write_flag ? RW_WRITER : RW_READER); return (write_flag); } /*ARGSUSED1*/ static void devfs_rwunlock(struct vnode *vp, int write_flag, caller_context_t *ct) { dcmn_err2(("devfs_rwunlock %s\n", VTODV(vp)->dv_name)); rw_exit(&VTODV(vp)->dv_contents); } /* * XXX Should probably do a better job of computing the maximum * offset available in the directory. */ /*ARGSUSED1*/ static int devfs_seek(struct vnode *vp, offset_t ooff, offset_t *noffp, caller_context_t *ct) { ASSERT(vp->v_type == VDIR); dcmn_err2(("devfs_seek %s\n", VTODV(vp)->dv_name)); return ((*noffp < 0 || *noffp > MAXOFFSET_T) ? EINVAL : 0); } vnodeops_t *dv_vnodeops; const fs_operation_def_t dv_vnodeops_template[] = { VOPNAME_OPEN, { .vop_open = devfs_open }, VOPNAME_CLOSE, { .vop_close = devfs_close }, VOPNAME_READ, { .vop_read = devfs_read }, VOPNAME_WRITE, { .vop_write = devfs_write }, VOPNAME_IOCTL, { .vop_ioctl = devfs_ioctl }, VOPNAME_GETATTR, { .vop_getattr = devfs_getattr }, VOPNAME_SETATTR, { .vop_setattr = devfs_setattr }, VOPNAME_ACCESS, { .vop_access = devfs_access }, VOPNAME_LOOKUP, { .vop_lookup = devfs_lookup }, VOPNAME_CREATE, { .vop_create = devfs_create }, VOPNAME_READDIR, { .vop_readdir = devfs_readdir }, VOPNAME_FSYNC, { .vop_fsync = devfs_fsync }, VOPNAME_INACTIVE, { .vop_inactive = devfs_inactive }, VOPNAME_FID, { .vop_fid = devfs_fid }, VOPNAME_RWLOCK, { .vop_rwlock = devfs_rwlock }, VOPNAME_RWUNLOCK, { .vop_rwunlock = devfs_rwunlock }, VOPNAME_SEEK, { .vop_seek = devfs_seek }, VOPNAME_PATHCONF, { .vop_pathconf = devfs_pathconf }, VOPNAME_DISPOSE, { .error = fs_error }, VOPNAME_SETSECATTR, { .vop_setsecattr = devfs_setsecattr }, VOPNAME_GETSECATTR, { .vop_getsecattr = devfs_getsecattr }, NULL, NULL };