Mercurial > illumos > illumos-gate
view usr/src/uts/common/fs/dev/sdev_ipnetops.c @ 14140:1652c59077c6
3978 renaming dynamic sdev nodes is problematic
3979 sdev dynamic directories can be created multiple times
3980 sdev vfs refcount assertion violation
3981 sdev backing store nodes not always present
3982 sdev could use some theory statements
3983 sdev_shadow_node slept through a vn_rele
Reviewed by: Keith M Wesolowski <wesolows@foobazco.org>
Reviewed by: Jerry Jelinek <jerry.jelinek@joyent.com>
Reviewed by: Gordon Ross <gwr@nexenta.com>
Reviewed by: Richard Lowe <richlowe@richlowe.net>
Approved by: Garrett D'Amore <garrett@damore.org>
author | Robert Mustacchi <rm@joyent.com> |
---|---|
date | Wed, 08 May 2013 01:46:41 +0000 |
parents | faf256d5c16c |
children |
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/* * 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 2008 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ /* * vnode ops for the /dev/ipnet directory * The lookup is based on the ipnetif nodes held * in the ipnet module. We also override readdir * in order to delete ipnet nodes no longer in use. */ #include <sys/types.h> #include <sys/param.h> #include <sys/sysmacros.h> #include <sys/sunndi.h> #include <fs/fs_subr.h> #include <sys/fs/dv_node.h> #include <sys/fs/sdev_impl.h> #include <sys/policy.h> #include <inet/ipnet.h> #include <sys/zone.h> struct vnodeops *devipnet_vnodeops; static void devipnet_fill_vattr(struct vattr *vap, dev_t dev) { timestruc_t now; *vap = sdev_vattr_chr; vap->va_rdev = dev; vap->va_mode |= 0666; gethrestime(&now); vap->va_atime = now; vap->va_mtime = now; vap->va_ctime = now; } /* * Check if an ipnet sdev_node is still valid. */ int devipnet_validate(struct sdev_node *dv) { dev_t dev; dev = ipnet_if_getdev(dv->sdev_name, getzoneid()); if (dev == (dev_t)-1) return (SDEV_VTOR_INVALID); if (getminor(SDEVTOV(dv)->v_rdev) != getminor(dev)) return (SDEV_VTOR_STALE); return (SDEV_VTOR_VALID); } /* * This callback is invoked from devname_lookup_func() to create * an ipnet entry when the node is not found in the cache. */ /*ARGSUSED*/ static int devipnet_create_rvp(struct sdev_node *ddv, char *nm, void **arg, cred_t *cred, void *whatever, char *whichever) { dev_t dev; struct vattr *vap = (struct vattr *)arg; int err = 0; if ((dev = ipnet_if_getdev(nm, getzoneid())) == (dev_t)-1) err = ENOENT; else devipnet_fill_vattr(vap, dev); return (err); } /* * Lookup for /dev/ipnet directory * If the entry does not exist, the devipnet_create_rvp() callback * is invoked to create it. Nodes do not persist across reboot. */ /*ARGSUSED3*/ static int devipnet_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) { struct sdev_node *sdvp = VTOSDEV(dvp); struct sdev_node *dv; struct vnode *rvp = NULL; int error; error = devname_lookup_func(sdvp, nm, vpp, cred, devipnet_create_rvp, SDEV_VATTR); if (error == 0) { switch ((*vpp)->v_type) { case VCHR: dv = VTOSDEV(VTOS(*vpp)->s_realvp); ASSERT(VOP_REALVP(SDEVTOV(dv), &rvp, NULL) == ENOSYS); break; case VDIR: dv = VTOSDEV(*vpp); break; default: cmn_err(CE_PANIC, "devipnet_lookup: Unsupported node " "type: %p: %d", (void *)(*vpp), (*vpp)->v_type); break; } ASSERT(SDEV_HELD(dv)); } return (error); } static void devipnet_filldir_entry(const char *name, void *arg, dev_t dev) { struct sdev_node *ddv = arg; struct vattr vattr; struct sdev_node *dv; ASSERT(RW_WRITE_HELD(&ddv->sdev_contents)); if ((dv = sdev_cache_lookup(ddv, (char *)name)) == NULL) { devipnet_fill_vattr(&vattr, dev); if (sdev_mknode(ddv, (char *)name, &dv, &vattr, NULL, NULL, kcred, SDEV_READY) != 0) return; } SDEV_SIMPLE_RELE(dv); } static void devipnet_filldir(struct sdev_node *ddv) { sdev_node_t *dv, *next; ASSERT(RW_READ_HELD(&ddv->sdev_contents)); if (rw_tryupgrade(&ddv->sdev_contents) == NULL) { rw_exit(&ddv->sdev_contents); rw_enter(&ddv->sdev_contents, RW_WRITER); /* * We've been made a zombie while we weren't looking. We'll bail * if that's the case. */ if (ddv->sdev_state == SDEV_ZOMBIE) { rw_exit(&ddv->sdev_contents); return; } } for (dv = SDEV_FIRST_ENTRY(ddv); dv; dv = next) { next = SDEV_NEXT_ENTRY(ddv, dv); /* validate and prune only ready nodes */ if (dv->sdev_state != SDEV_READY) continue; switch (devipnet_validate(dv)) { case SDEV_VTOR_VALID: case SDEV_VTOR_SKIP: continue; case SDEV_VTOR_INVALID: case SDEV_VTOR_STALE: sdcmn_err12(("devipnet_filldir: destroy invalid " "node: %s(%p)\n", dv->sdev_name, (void *)dv)); break; } if (SDEVTOV(dv)->v_count > 0) continue; SDEV_HOLD(dv); /* remove the cache node */ (void) sdev_cache_update(ddv, &dv, dv->sdev_name, SDEV_CACHE_DELETE); SDEV_RELE(dv); } ipnet_walk_if(devipnet_filldir_entry, ddv, getzoneid()); rw_downgrade(&ddv->sdev_contents); } /* * Display all instantiated ipnet device nodes. */ /* ARGSUSED */ static int devipnet_readdir(struct vnode *dvp, struct uio *uiop, struct cred *cred, int *eofp, caller_context_t *ct, int flags) { struct sdev_node *sdvp = VTOSDEV(dvp); if (uiop->uio_offset == 0) devipnet_filldir(sdvp); return (devname_readdir_func(dvp, uiop, cred, eofp, 0)); } /* * We override lookup and readdir to build entries based on the * in kernel ipnet table. */ const fs_operation_def_t devipnet_vnodeops_tbl[] = { VOPNAME_READDIR, { .vop_readdir = devipnet_readdir }, VOPNAME_LOOKUP, { .vop_lookup = devipnet_lookup }, VOPNAME_CREATE, { .error = fs_nosys }, VOPNAME_REMOVE, { .error = fs_nosys }, VOPNAME_MKDIR, { .error = fs_nosys }, VOPNAME_RMDIR, { .error = fs_nosys }, VOPNAME_SYMLINK, { .error = fs_nosys }, VOPNAME_SETSECATTR, { .error = fs_nosys }, NULL, NULL };