/* * 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. */ #pragma ident "%Z%%M% %I% %E% SMI" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* * Autofs and Zones: * * Zones are delegated the responsibility of managing their own autofs mounts * and maps. Each zone runs its own copy of automountd, with its own timeouts, * and other logically "global" parameters. kRPC and virtualization in the * loopback transport (tl) will prevent a zone from communicating with another * zone's automountd. * * Each zone has its own "rootfnnode" and associated tree of auto nodes. * * Each zone also has its own set of "unmounter" kernel threads; these are * created and run within the zone's context (ie, they are created via * zthread_create()). * * Cross-zone mount triggers are disallowed. There is a check in * auto_trigger_mount() to this effect; EPERM is returned to indicate that the * mount is not owned by the caller. * * autofssys() enables a caller in the global zone to clean up in-kernel (as * well as regular) autofs mounts via the unmount_tree() mechanism. This is * routinely done when all mounts are removed as part of zone shutdown. */ #define TYPICALMAXPATHLEN 64 static kmutex_t autofs_nodeid_lock; static int auto_perform_link(fnnode_t *, struct linka *, cred_t *); static int auto_perform_actions(fninfo_t *, fnnode_t *, action_list *, cred_t *); static int auto_getmntpnt(vnode_t *, char *, vnode_t **, cred_t *); static int auto_lookup_request(fninfo_t *, char *, struct linka *, bool_t, bool_t *, cred_t *); static int auto_mount_request(fninfo_t *, char *, action_list **, cred_t *, bool_t); /* * Clears the MF_INPROG flag, and wakes up those threads sleeping on * fn_cv_mount if MF_WAITING is set. */ void auto_unblock_others( fnnode_t *fnp, uint_t operation) /* either MF_INPROG or MF_LOOKUP */ { ASSERT(operation & (MF_INPROG | MF_LOOKUP)); fnp->fn_flags &= ~operation; if (fnp->fn_flags & MF_WAITING) { fnp->fn_flags &= ~MF_WAITING; cv_broadcast(&fnp->fn_cv_mount); } } int auto_wait4mount(fnnode_t *fnp) { int error; k_sigset_t smask; AUTOFS_DPRINT((4, "auto_wait4mount: fnp=%p\n", (void *)fnp)); mutex_enter(&fnp->fn_lock); while (fnp->fn_flags & (MF_INPROG | MF_LOOKUP)) { /* * There is a mount or a lookup in progress. */ fnp->fn_flags |= MF_WAITING; sigintr(&smask, 1); if (!cv_wait_sig(&fnp->fn_cv_mount, &fnp->fn_lock)) { /* * Decided not to wait for operation to * finish after all. */ sigunintr(&smask); mutex_exit(&fnp->fn_lock); return (EINTR); } sigunintr(&smask); } error = fnp->fn_error; if (error == EINTR) { /* * The thread doing the mount got interrupted, we need to * try again, by returning EAGAIN. */ error = EAGAIN; } mutex_exit(&fnp->fn_lock); AUTOFS_DPRINT((5, "auto_wait4mount: fnp=%p error=%d\n", (void *)fnp, error)); return (error); } int auto_lookup_aux(fnnode_t *fnp, char *name, cred_t *cred) { struct fninfo *fnip; struct linka link; bool_t mountreq = FALSE; int error = 0; fnip = vfstofni(fntovn(fnp)->v_vfsp); bzero(&link, sizeof (link)); error = auto_lookup_request(fnip, name, &link, TRUE, &mountreq, cred); if (!error) { if (link.link != NULL || link.link != '\0') { /* * This node should be a symlink */ error = auto_perform_link(fnp, &link, cred); } else if (mountreq) { /* * The automount daemon is requesting a mount, * implying this entry must be a wildcard match and * therefore in need of verification that the entry * exists on the server. */ mutex_enter(&fnp->fn_lock); AUTOFS_BLOCK_OTHERS(fnp, MF_INPROG); fnp->fn_error = 0; /* * Unblock other lookup requests on this node, * this is needed to let the lookup generated by * the mount call to complete. The caveat is * other lookups on this node can also get by, * i.e., another lookup on this node that occurs * while this lookup is attempting the mount * would return a positive result no matter what. * Therefore two lookups on the this node could * potentially get disparate results. */ AUTOFS_UNBLOCK_OTHERS(fnp, MF_LOOKUP); mutex_exit(&fnp->fn_lock); /* * auto_new_mount_thread fires up a new thread which * calls automountd finishing up the work */ auto_new_mount_thread(fnp, name, cred); /* * At this point, we are simply another thread * waiting for the mount to complete */ error = auto_wait4mount(fnp); if (error == AUTOFS_SHUTDOWN) error = ENOENT; } } if (link.link) kmem_free(link.link, strlen(link.link) + 1); if (link.dir) kmem_free(link.dir, strlen(link.dir) + 1); mutex_enter(&fnp->fn_lock); fnp->fn_error = error; /* * Notify threads waiting for lookup/mount that * it's done. */ if (mountreq) { AUTOFS_UNBLOCK_OTHERS(fnp, MF_INPROG); } else { AUTOFS_UNBLOCK_OTHERS(fnp, MF_LOOKUP); } mutex_exit(&fnp->fn_lock); return (error); } /* * Starting point for thread to handle mount requests with automountd. * XXX auto_mount_thread() is not suspend-safe within the scope of * the present model defined for cpr to suspend the system. Calls * made by the auto_mount_thread() that have been identified to be unsafe * are (1) RPC client handle setup and client calls to automountd which * can block deep down in the RPC library, (2) kmem_alloc() calls with the * KM_SLEEP flag which can block if memory is low, and (3) VFS_*(), and * lookuppnvp() calls which can result in over the wire calls to servers. * The thread should be completely reevaluated to make it suspend-safe in * case of future updates to the cpr model. */ static void auto_mount_thread(struct autofs_callargs *argsp) { struct fninfo *fnip; fnnode_t *fnp; vnode_t *vp; char *name; size_t namelen; cred_t *cred; action_list *alp = NULL; int error; callb_cpr_t cprinfo; kmutex_t auto_mount_thread_cpr_lock; mutex_init(&auto_mount_thread_cpr_lock, NULL, MUTEX_DEFAULT, NULL); CALLB_CPR_INIT(&cprinfo, &auto_mount_thread_cpr_lock, callb_generic_cpr, "auto_mount_thread"); fnp = argsp->fnc_fnp; vp = fntovn(fnp); fnip = vfstofni(vp->v_vfsp); name = argsp->fnc_name; cred = argsp->fnc_cred; ASSERT(crgetzoneid(argsp->fnc_cred) == fnip->fi_zoneid); error = auto_mount_request(fnip, name, &alp, cred, TRUE); if (!error) error = auto_perform_actions(fnip, fnp, alp, cred); mutex_enter(&fnp->fn_lock); fnp->fn_error = error; /* * Notify threads waiting for mount that * it's done. */ AUTOFS_UNBLOCK_OTHERS(fnp, MF_INPROG); mutex_exit(&fnp->fn_lock); VN_RELE(vp); crfree(argsp->fnc_cred); namelen = strlen(argsp->fnc_name) + 1; kmem_free(argsp->fnc_name, namelen); kmem_free(argsp, sizeof (*argsp)); mutex_enter(&auto_mount_thread_cpr_lock); CALLB_CPR_EXIT(&cprinfo); mutex_destroy(&auto_mount_thread_cpr_lock); zthread_exit(); /* NOTREACHED */ } static int autofs_thr_success = 0; /* * Creates new thread which calls auto_mount_thread which does * the bulk of the work calling automountd, via 'auto_perform_actions'. */ void auto_new_mount_thread(fnnode_t *fnp, char *name, cred_t *cred) { struct autofs_callargs *argsp; argsp = kmem_alloc(sizeof (*argsp), KM_SLEEP); VN_HOLD(fntovn(fnp)); argsp->fnc_fnp = fnp; argsp->fnc_name = kmem_alloc(strlen(name) + 1, KM_SLEEP); (void) strcpy(argsp->fnc_name, name); argsp->fnc_origin = curthread; crhold(cred); argsp->fnc_cred = cred; (void) zthread_create(NULL, 0, auto_mount_thread, argsp, 0, minclsyspri); autofs_thr_success++; } int auto_calldaemon( zoneid_t zoneid, int which, xdrproc_t xarg_func, void *argsp, xdrproc_t xresp_func, void *resp, int reslen, bool_t hard) /* retry forever? */ { int retry, error = 0; k_sigset_t smask; door_arg_t door_args; door_handle_t dh; XDR xdrarg, xdrres; struct autofs_globals *fngp = NULL; void *orig_resp = NULL; int orig_reslen = reslen; autofs_door_args_t *xdr_argsp; int xdr_len = 0; int printed_not_running_msg = 0; klwp_t *lwp = ttolwp(curthread); /* * We know that the current thread is doing work on * behalf of its own zone, so it's ok to use * curproc->p_zone. */ ASSERT(zoneid == getzoneid()); if (zone_status_get(curproc->p_zone) >= ZONE_IS_SHUTTING_DOWN) { /* * There's no point in trying to talk to * automountd. Plus, zone_shutdown() is * waiting for us. */ return (ECONNREFUSED); } do { retry = 0; mutex_enter(&autofs_minor_lock); fngp = zone_getspecific(autofs_key, curproc->p_zone); mutex_exit(&autofs_minor_lock); if (fngp == NULL) { if (hard) { AUTOFS_DPRINT((5, "auto_calldaemon: "\ "failed to get door handle\n")); if (!printed_not_running_msg) { printed_not_running_msg = 1; zprintf(zoneid, "automountd not "\ "running, retrying\n"); } delay(hz); retry = 1; } else { /* * There is no global data so no door. * There's no point in attempting to talk * to automountd if we can't get the door * handle. */ return (ECONNREFUSED); } } } while (retry); if (printed_not_running_msg) { fngp->fng_printed_not_running_msg = printed_not_running_msg; } ASSERT(fngp != NULL); if (argsp != NULL && (xdr_len = xdr_sizeof(xarg_func, argsp)) == 0) return (EINVAL); xdr_argsp = kmem_zalloc(xdr_len + sizeof (*xdr_argsp), KM_SLEEP); xdr_argsp->xdr_len = xdr_len; xdr_argsp->cmd = which; if (argsp) { xdrmem_create(&xdrarg, (char *)&xdr_argsp->xdr_arg, xdr_argsp->xdr_len, XDR_ENCODE); if (!(*xarg_func)(&xdrarg, argsp)) { kmem_free(xdr_argsp, xdr_len + sizeof (*xdr_argsp)); return (EINVAL); } } /* * We're saving off the original pointer and length due to the * possibility that the results buffer returned by the door * upcall can be different then what we passed in. This is because * the door will allocate new memory if the results buffer passed * in isn't large enough to hold what we need to send back. * In this case we need to free the memory originally allocated * for that buffer. */ if (orig_reslen) orig_resp = kmem_zalloc(orig_reslen, KM_SLEEP); do { retry = 0; mutex_enter(&fngp->fng_autofs_daemon_lock); dh = fngp->fng_autofs_daemon_dh; if (dh) door_ki_hold(dh); mutex_exit(&fngp->fng_autofs_daemon_lock); if (dh == NULL) { if (orig_resp) kmem_free(orig_resp, orig_reslen); kmem_free(xdr_argsp, xdr_len + sizeof (*xdr_argsp)); return (ENOENT); } door_args.data_ptr = (char *)xdr_argsp; door_args.data_size = sizeof (*xdr_argsp) + xdr_argsp->xdr_len; door_args.desc_ptr = NULL; door_args.desc_num = 0; door_args.rbuf = orig_resp ? (char *)orig_resp : NULL; door_args.rsize = reslen; sigintr(&smask, 1); error = door_ki_upcall(dh, &door_args); sigunintr(&smask); door_ki_rele(dh); if (!error) { autofs_door_res_t *adr = (autofs_door_res_t *)door_args.rbuf; if (door_args.rbuf != NULL && (error = adr->res_status)) { kmem_free(xdr_argsp, xdr_len + sizeof (*xdr_argsp)); if (orig_resp) kmem_free(orig_resp, orig_reslen); return (error); } continue; } switch (error) { case EINTR: /* * interrupts should be handled properly by the * door upcall. If the door doesn't handle the * interupt completely then we need to bail out. */ if (lwp && (ISSIG(curthread, JUSTLOOKING) || MUSTRETURN(curproc, curthread))) { if (ISSIG(curthread, FORREAL) || lwp->lwp_sysabort || MUSTRETURN(curproc, curthread)) { lwp->lwp_sysabort = 0; return (EINTR); } } /* * We may have gotten EINTR for other reasons * like the door being revoked on us. Instead * of trying to extract this out of the door * handle, sleep and try again, if still * revoked we will get EBADF next time * through. * * If we have a pending cancellation and we don't * have cancellation disabled, we will get EINTR * forever, no matter how many times we retry, * so just get out now if this is the case. */ if (schedctl_cancel_pending()) break; /* FALLTHROUGH */ case EAGAIN: /* process may be forking */ /* * Back off for a bit */ delay(hz); retry = 1; break; case EBADF: /* Invalid door */ case EINVAL: /* Not a door, wrong target */ /* * A fatal door error, if our failing door * handle is the current door handle, clean * up our state. */ mutex_enter(&fngp->fng_autofs_daemon_lock); if (dh == fngp->fng_autofs_daemon_dh) { door_ki_rele(fngp->fng_autofs_daemon_dh); fngp->fng_autofs_daemon_dh = NULL; } mutex_exit(&fngp->fng_autofs_daemon_lock); AUTOFS_DPRINT((5, "auto_calldaemon error=%d\n", error)); if (hard) { if (!fngp->fng_printed_not_running_msg) { fngp->fng_printed_not_running_msg = 1; zprintf(zoneid, "automountd not "\ "running, retrying\n"); } delay(hz); retry = 1; break; } else { error = ECONNREFUSED; kmem_free(xdr_argsp, xdr_len + sizeof (*xdr_argsp)); if (orig_resp) kmem_free(orig_resp, orig_reslen); return (error); } default: /* Unknown must be fatal */ error = ENOENT; kmem_free(xdr_argsp, xdr_len + sizeof (*xdr_argsp)); if (orig_resp) kmem_free(orig_resp, orig_reslen); return (error); } } while (retry); if (fngp->fng_printed_not_running_msg == 1) { fngp->fng_printed_not_running_msg = 0; zprintf(zoneid, "automountd OK\n"); } if (orig_resp && orig_reslen) { autofs_door_res_t *door_resp; door_resp = (autofs_door_res_t *)door_args.rbuf; if ((void *)door_args.rbuf != orig_resp) kmem_free(orig_resp, orig_reslen); xdrmem_create(&xdrres, (char *)&door_resp->xdr_res, door_resp->xdr_len, XDR_DECODE); if (!((*xresp_func)(&xdrres, resp))) error = EINVAL; kmem_free(door_args.rbuf, door_args.rsize); } kmem_free(xdr_argsp, xdr_len + sizeof (*xdr_argsp)); return (error); } static int auto_null_request(fninfo_t *fnip, bool_t hard) { int error; struct autofs_globals *fngp = vntofn(fnip->fi_rootvp)->fn_globals; AUTOFS_DPRINT((4, "\tauto_null_request\n")); error = auto_calldaemon(fngp->fng_zoneid, NULLPROC, xdr_void, NULL, xdr_void, NULL, 0, hard); AUTOFS_DPRINT((5, "\tauto_null_request: error=%d\n", error)); return (error); } static int auto_lookup_request( fninfo_t *fnip, char *key, struct linka *lnp, bool_t hard, bool_t *mountreq, cred_t *cred) { int error; struct autofs_globals *fngp; struct autofs_lookupargs reqst; autofs_lookupres *resp; struct linka *p; AUTOFS_DPRINT((4, "auto_lookup_equest: path=%s name=%s\n", fnip->fi_path, key)); fngp = vntofn(fnip->fi_rootvp)->fn_globals; reqst.map = fnip->fi_map; reqst.path = fnip->fi_path; if (fnip->fi_flags & MF_DIRECT) reqst.name = fnip->fi_key; else reqst.name = key; AUTOFS_DPRINT((4, "auto_lookup_request: using key=%s\n", reqst.name)); reqst.subdir = fnip->fi_subdir; reqst.opts = fnip->fi_opts; reqst.isdirect = fnip->fi_flags & MF_DIRECT ? TRUE : FALSE; reqst.uid = crgetuid(cred); resp = kmem_zalloc(sizeof (*resp), KM_SLEEP); error = auto_calldaemon(fngp->fng_zoneid, AUTOFS_LOOKUP, xdr_autofs_lookupargs, &reqst, xdr_autofs_lookupres, (void *)resp, sizeof (autofs_lookupres), hard); if (error) { xdr_free(xdr_autofs_lookupres, (char *)resp); kmem_free(resp, sizeof (*resp)); return (error); } if (!error) { fngp->fng_verbose = resp->lu_verbose; switch (resp->lu_res) { case AUTOFS_OK: switch (resp->lu_type.action) { case AUTOFS_MOUNT_RQ: lnp->link = NULL; lnp->dir = NULL; *mountreq = TRUE; break; case AUTOFS_LINK_RQ: p = &resp->lu_type.lookup_result_type_u.lt_linka; lnp->dir = kmem_alloc(strlen(p->dir) + 1, KM_SLEEP); (void) strcpy(lnp->dir, p->dir); lnp->link = kmem_alloc(strlen(p->link) + 1, KM_SLEEP); (void) strcpy(lnp->link, p->link); break; case AUTOFS_NONE: lnp->link = NULL; lnp->dir = NULL; break; default: auto_log(fngp->fng_verbose, fngp->fng_zoneid, CE_WARN, "auto_lookup_request: bad action type %d", resp->lu_res); error = ENOENT; } break; case AUTOFS_NOENT: error = ENOENT; break; default: error = ENOENT; auto_log(fngp->fng_verbose, fngp->fng_zoneid, CE_WARN, "auto_lookup_request: unknown result: %d", resp->lu_res); break; } } done: xdr_free(xdr_autofs_lookupres, (char *)resp); kmem_free(resp, sizeof (*resp)); AUTOFS_DPRINT((5, "auto_lookup_request: path=%s name=%s error=%d\n", fnip->fi_path, key, error)); return (error); } static int auto_mount_request( fninfo_t *fnip, char *key, action_list **alpp, cred_t *cred, bool_t hard) { int error; struct autofs_globals *fngp; autofs_lookupargs reqst; autofs_mountres *xdrres = NULL; AUTOFS_DPRINT((4, "auto_mount_request: path=%s name=%s\n", fnip->fi_path, key)); fngp = vntofn(fnip->fi_rootvp)->fn_globals; reqst.map = fnip->fi_map; reqst.path = fnip->fi_path; if (fnip->fi_flags & MF_DIRECT) reqst.name = fnip->fi_key; else reqst.name = key; AUTOFS_DPRINT((4, "auto_mount_request: using key=%s\n", reqst.name)); reqst.subdir = fnip->fi_subdir; reqst.opts = fnip->fi_opts; reqst.isdirect = fnip->fi_flags & MF_DIRECT ? TRUE : FALSE; reqst.uid = crgetuid(cred); xdrres = kmem_zalloc(sizeof (*xdrres), KM_SLEEP); error = auto_calldaemon(fngp->fng_zoneid, AUTOFS_MNTINFO, xdr_autofs_lookupargs, &reqst, xdr_autofs_mountres, (void *)xdrres, sizeof (autofs_mountres), hard); if (!error) { fngp->fng_verbose = xdrres->mr_verbose; switch (xdrres->mr_type.status) { case AUTOFS_ACTION: error = 0; /* * Save the action list since it is used by * the caller. We NULL the action list pointer * in 'result' so that xdr_free() will not free * the list. */ *alpp = xdrres->mr_type.mount_result_type_u.list; xdrres->mr_type.mount_result_type_u.list = NULL; break; case AUTOFS_DONE: error = xdrres->mr_type.mount_result_type_u.error; break; default: error = ENOENT; auto_log(fngp->fng_verbose, fngp->fng_zoneid, CE_WARN, "auto_mount_request: unknown status %d", xdrres->mr_type.status); break; } } xdr_free(xdr_autofs_mountres, (char *)xdrres); kmem_free(xdrres, sizeof (*xdrres)); AUTOFS_DPRINT((5, "auto_mount_request: path=%s name=%s error=%d\n", fnip->fi_path, key, error)); return (error); } static int auto_send_unmount_request( fninfo_t *fnip, umntrequest *ul, bool_t hard) { int error; umntres xdrres; struct autofs_globals *fngp = vntofn(fnip->fi_rootvp)->fn_globals; AUTOFS_DPRINT((4, "\tauto_send_unmount_request: fstype=%s " " mntpnt=%s\n", ul->fstype, ul->mntpnt)); bzero(&xdrres, sizeof (umntres)); error = auto_calldaemon(fngp->fng_zoneid, AUTOFS_UNMOUNT, xdr_umntrequest, (void *)ul, xdr_umntres, (void *)&xdrres, sizeof (umntres), hard); if (!error) error = xdrres.status; AUTOFS_DPRINT((5, "\tauto_send_unmount_request: error=%d\n", error)); return (error); } static int auto_perform_link(fnnode_t *fnp, struct linka *linkp, cred_t *cred) { vnode_t *vp; size_t len; char *tmp; AUTOFS_DPRINT((3, "auto_perform_link: fnp=%p dir=%s link=%s\n", (void *)fnp, linkp->dir, linkp->link)); len = strlen(linkp->link) + 1; /* include '\0' */ tmp = kmem_zalloc(len, KM_SLEEP); (void) kcopy(linkp->link, tmp, len); mutex_enter(&fnp->fn_lock); fnp->fn_symlink = tmp; fnp->fn_symlinklen = (uint_t)len; fnp->fn_flags |= MF_THISUID_MATCH_RQD; crhold(cred); fnp->fn_cred = cred; mutex_exit(&fnp->fn_lock); vp = fntovn(fnp); vp->v_type = VLNK; return (0); } static void auto_free_autofs_args(struct mounta *m) { autofs_args *aargs = (autofs_args *)m->dataptr; if (aargs->addr.buf) kmem_free(aargs->addr.buf, aargs->addr.len); if (aargs->path) kmem_free(aargs->path, strlen(aargs->path) + 1); if (aargs->opts) kmem_free(aargs->opts, strlen(aargs->opts) + 1); if (aargs->map) kmem_free(aargs->map, strlen(aargs->map) + 1); if (aargs->subdir) kmem_free(aargs->subdir, strlen(aargs->subdir) + 1); if (aargs->key) kmem_free(aargs->key, strlen(aargs->key) + 1); kmem_free(aargs, sizeof (*aargs)); } static void auto_free_action_list(action_list *alp) { struct mounta *m; action_list *lastalp; char *fstype; m = &alp->action.action_list_entry_u.mounta; while (alp != NULL) { fstype = alp->action.action_list_entry_u.mounta.fstype; m = &alp->action.action_list_entry_u.mounta; if (m->dataptr) { if (strcmp(fstype, "autofs") == 0) { auto_free_autofs_args(m); } } if (m->spec) kmem_free(m->spec, strlen(m->spec) + 1); if (m->dir) kmem_free(m->dir, strlen(m->dir) + 1); if (m->fstype) kmem_free(m->fstype, strlen(m->fstype) + 1); if (m->optptr) kmem_free(m->optptr, m->optlen); lastalp = alp; alp = alp->next; kmem_free(lastalp, sizeof (*lastalp)); } } static boolean_t auto_invalid_autofs(fninfo_t *dfnip, fnnode_t *dfnp, action_list *p) { struct mounta *m; struct autofs_args *argsp; vnode_t *dvp; char buff[AUTOFS_MAXPATHLEN]; size_t len; struct autofs_globals *fngp; fngp = dfnp->fn_globals; dvp = fntovn(dfnp); m = &p->action.action_list_entry_u.mounta; /* * Make sure we aren't geting passed NULL values or a "dir" that * isn't "." and doesn't begin with "./". * * We also only want to perform autofs mounts, so make sure * no-one is trying to trick us into doing anything else. */ if (m->spec == NULL || m->dir == NULL || m->dir[0] != '.' || (m->dir[1] != '/' && m->dir[1] != '\0') || m->fstype == NULL || strcmp(m->fstype, "autofs") != 0 || m->dataptr == NULL || m->datalen != sizeof (struct autofs_args) || m->optptr == NULL) return (B_TRUE); /* * We also don't like ".."s in the pathname. Symlinks are * handled by the fact that we'll use NOFOLLOW when we do * lookup()s. */ if (strstr(m->dir, "/../") != NULL || (len = strlen(m->dir)) > sizeof ("/..") - 1 && m->dir[len] == '.' && m->dir[len - 1] == '.' && m->dir[len - 2] == '/') return (B_TRUE); argsp = (struct autofs_args *)m->dataptr; /* * We don't want NULL values here either. */ if (argsp->addr.buf == NULL || argsp->path == NULL || argsp->opts == NULL || argsp->map == NULL || argsp->subdir == NULL) return (B_TRUE); /* * We know what the claimed pathname *should* look like: * * If the parent (dfnp) is a mount point (VROOT), then * the path should be (dfnip->fi_path + m->dir). * * Else, we know we're only two levels deep, so we use * (dfnip->fi_path + dfnp->fn_name + m->dir). * * Furthermore, "." only makes sense if dfnp is a * trigger node. * * At this point it seems like the passed-in path is * redundant. */ if (dvp->v_flag & VROOT) { if (m->dir[1] == '\0' && !(dfnp->fn_flags & MF_TRIGGER)) return (B_TRUE); (void) snprintf(buff, sizeof (buff), "%s%s", dfnip->fi_path, m->dir + 1); } else { (void) snprintf(buff, sizeof (buff), "%s/%s%s", dfnip->fi_path, dfnp->fn_name, m->dir + 1); } if (strcmp(argsp->path, buff) != 0) { auto_log(fngp->fng_verbose, fngp->fng_zoneid, CE_WARN, "autofs: expected path of '%s', " "got '%s' instead.", buff, argsp->path); return (B_TRUE); } return (B_FALSE); /* looks OK */ } /* * auto_invalid_action will validate the action_list received. If all is good * this function returns FALSE, if there is a problem it returns TRUE. */ static boolean_t auto_invalid_action(fninfo_t *dfnip, fnnode_t *dfnp, action_list *alistpp) { /* * Before we go any further, this better be a mount request. */ if (alistpp->action.action != AUTOFS_MOUNT_RQ) return (B_TRUE); return (auto_invalid_autofs(dfnip, dfnp, alistpp)); } static int auto_perform_actions( fninfo_t *dfnip, fnnode_t *dfnp, action_list *alp, cred_t *cred) /* Credentials of the caller */ { action_list *p; struct mounta *m, margs; struct autofs_args *argsp; int error, success = 0; vnode_t *mvp, *dvp, *newvp; fnnode_t *newfnp, *mfnp; int auto_mount = 0; int save_triggers = 0; int update_times = 0; char *mntpnt; char buff[AUTOFS_MAXPATHLEN]; timestruc_t now; struct autofs_globals *fngp; cred_t *zcred; AUTOFS_DPRINT((4, "auto_perform_actions: alp=%p\n", (void *)alp)); fngp = dfnp->fn_globals; dvp = fntovn(dfnp); /* * As automountd running in a zone may be compromised, and this may be * an attack, we can't trust everything passed in by automountd, and we * need to do argument verification. We'll issue a warning and drop * the request if it doesn't seem right. */ for (p = alp; p != NULL; p = p->next) { if (auto_invalid_action(dfnip, dfnp, p)) { /* * This warning should be sent to the global zone, * since presumably the zone administrator is the same * as the attacker. */ cmn_err(CE_WARN, "autofs: invalid action list received " "by automountd in zone %s.", curproc->p_zone->zone_name); /* * This conversation is over. */ xdr_free(xdr_action_list, (char *)alp); return (EINVAL); } } zcred = zone_get_kcred(getzoneid()); ASSERT(zcred != NULL); if (vn_mountedvfs(dvp) != NULL) { /* * The daemon successfully mounted a filesystem * on the AUTOFS root node. */ mutex_enter(&dfnp->fn_lock); dfnp->fn_flags |= MF_MOUNTPOINT; ASSERT(dfnp->fn_dirents == NULL); mutex_exit(&dfnp->fn_lock); success++; } else { /* * Clear MF_MOUNTPOINT. */ mutex_enter(&dfnp->fn_lock); if (dfnp->fn_flags & MF_MOUNTPOINT) { AUTOFS_DPRINT((10, "autofs: clearing mountpoint " "flag on %s.", dfnp->fn_name)); ASSERT(dfnp->fn_dirents == NULL); ASSERT(dfnp->fn_trigger == NULL); } dfnp->fn_flags &= ~MF_MOUNTPOINT; mutex_exit(&dfnp->fn_lock); } for (p = alp; p != NULL; p = p->next) { vfs_t *vfsp; /* dummy argument */ vfs_t *mvfsp; auto_mount = 0; m = &p->action.action_list_entry_u.mounta; argsp = (struct autofs_args *)m->dataptr; ASSERT(strcmp(m->fstype, "autofs") == 0); /* * use the parent directory's timeout since it's the * one specified/inherited by automount. */ argsp->mount_to = dfnip->fi_mount_to; /* * The mountpoint is relative, and it is guaranteed to * begin with "." * */ ASSERT(m->dir[0] == '.'); if (m->dir[0] == '.' && m->dir[1] == '\0') { /* * mounting on the trigger node */ mvp = dvp; VN_HOLD(mvp); goto mount; } /* * ignore "./" in front of mountpoint */ ASSERT(m->dir[1] == '/'); mntpnt = m->dir + 2; AUTOFS_DPRINT((10, "\tdfnip->fi_path=%s\n", dfnip->fi_path)); AUTOFS_DPRINT((10, "\tdfnip->fi_flags=%x\n", dfnip->fi_flags)); AUTOFS_DPRINT((10, "\tmntpnt=%s\n", mntpnt)); if (dfnip->fi_flags & MF_DIRECT) { AUTOFS_DPRINT((10, "\tDIRECT\n")); (void) sprintf(buff, "%s/%s", dfnip->fi_path, mntpnt); } else { AUTOFS_DPRINT((10, "\tINDIRECT\n")); (void) sprintf(buff, "%s/%s/%s", dfnip->fi_path, dfnp->fn_name, mntpnt); } if (vn_mountedvfs(dvp) == NULL) { /* * Daemon didn't mount anything on the root * We have to create the mountpoint if it * doesn't exist already * * We use the caller's credentials in case a * UID-match is required * (MF_THISUID_MATCH_RQD). */ rw_enter(&dfnp->fn_rwlock, RW_WRITER); error = auto_search(dfnp, mntpnt, &mfnp, cred); if (error == 0) { /* * AUTOFS mountpoint exists */ if (vn_mountedvfs(fntovn(mfnp)) != NULL) { cmn_err(CE_PANIC, "auto_perform_actions:" " mfnp=%p covered", (void *)mfnp); } } else { /* * Create AUTOFS mountpoint */ ASSERT((dfnp->fn_flags & MF_MOUNTPOINT) == 0); error = auto_enter(dfnp, mntpnt, &mfnp, cred); ASSERT(mfnp->fn_linkcnt == 1); mfnp->fn_linkcnt++; } if (!error) update_times = 1; rw_exit(&dfnp->fn_rwlock); ASSERT(error != EEXIST); if (!error) { /* * mfnp is already held. */ mvp = fntovn(mfnp); } else { auto_log(fngp->fng_verbose, fngp->fng_zoneid, CE_WARN, "autofs: mount of %s " "failed - can't create" " mountpoint.", buff); continue; } } else { /* * Find mountpoint in VFS mounted here. If not * found, fail the submount, though the overall * mount has succeeded since the root is * mounted. */ if (error = auto_getmntpnt(dvp, mntpnt, &mvp, kcred)) { auto_log(fngp->fng_verbose, fngp->fng_zoneid, CE_WARN, "autofs: mount of %s " "failed - mountpoint doesn't" " exist.", buff); continue; } if (mvp->v_type == VLNK) { auto_log(fngp->fng_verbose, fngp->fng_zoneid, CE_WARN, "autofs: %s symbolic " "link: not a valid mountpoint " "- mount failed", buff); VN_RELE(mvp); error = ENOENT; continue; } } mount: m->flags |= MS_SYSSPACE | MS_OPTIONSTR; /* * Copy mounta struct here so we can substitute a * buffer that is large enough to hold the returned * option string, if that string is longer than the * input option string. * This can happen if there are default options enabled * that were not in the input option string. */ bcopy(m, &margs, sizeof (*m)); margs.optptr = kmem_alloc(MAX_MNTOPT_STR, KM_SLEEP); margs.optlen = MAX_MNTOPT_STR; (void) strcpy(margs.optptr, m->optptr); margs.dir = argsp->path; /* * We use the zone's kcred because we don't want the * zone to be able to thus do something it wouldn't * normally be able to. */ error = domount(NULL, &margs, mvp, zcred, &vfsp); kmem_free(margs.optptr, MAX_MNTOPT_STR); if (error != 0) { auto_log(fngp->fng_verbose, fngp->fng_zoneid, CE_WARN, "autofs: domount of %s failed " "error=%d", buff, error); VN_RELE(mvp); continue; } VFS_RELE(vfsp); /* * If mountpoint is an AUTOFS node, then I'm going to * flag it that the Filesystem mounted on top was * mounted in the kernel so that the unmount can be * done inside the kernel as well. * I don't care to flag non-AUTOFS mountpoints when an * AUTOFS in-kernel mount was done on top, because the * unmount routine already knows that such case was * done in the kernel. */ if (vfs_matchops(dvp->v_vfsp, vfs_getops(mvp->v_vfsp))) { mfnp = vntofn(mvp); mutex_enter(&mfnp->fn_lock); mfnp->fn_flags |= MF_IK_MOUNT; mutex_exit(&mfnp->fn_lock); } (void) vn_vfswlock_wait(mvp); mvfsp = vn_mountedvfs(mvp); if (mvfsp != NULL) { vfs_lock_wait(mvfsp); vn_vfsunlock(mvp); error = VFS_ROOT(mvfsp, &newvp); vfs_unlock(mvfsp); if (error) { /* * We've dropped the locks, so let's * get the mounted vfs again in case * it changed. */ (void) vn_vfswlock_wait(mvp); mvfsp = vn_mountedvfs(mvp); if (mvfsp != NULL) { error = dounmount(mvfsp, 0, CRED()); if (error) { cmn_err(CE_WARN, "autofs: could" " not unmount" " vfs=%p", (void *)mvfsp); } } else vn_vfsunlock(mvp); VN_RELE(mvp); continue; } } else { vn_vfsunlock(mvp); VN_RELE(mvp); continue; } auto_mount = vfs_matchops(dvp->v_vfsp, vfs_getops(newvp->v_vfsp)); newfnp = vntofn(newvp); newfnp->fn_parent = dfnp; /* * At this time we want to save the AUTOFS filesystem * as a trigger node. (We only do this if the mount * occurred on a node different from the root. * We look at the trigger nodes during * the automatic unmounting to make sure we remove them * as a unit and remount them as a unit if the * filesystem mounted at the root could not be * unmounted. */ if (auto_mount && (error == 0) && (mvp != dvp)) { save_triggers++; /* * Add AUTOFS mount to hierarchy */ newfnp->fn_flags |= MF_TRIGGER; rw_enter(&newfnp->fn_rwlock, RW_WRITER); newfnp->fn_next = dfnp->fn_trigger; rw_exit(&newfnp->fn_rwlock); rw_enter(&dfnp->fn_rwlock, RW_WRITER); dfnp->fn_trigger = newfnp; rw_exit(&dfnp->fn_rwlock); /* * Don't VN_RELE(newvp) here since dfnp now * holds reference to it as its trigger node. */ AUTOFS_DPRINT((10, "\tadding trigger %s to %s\n", newfnp->fn_name, dfnp->fn_name)); AUTOFS_DPRINT((10, "\tfirst trigger is %s\n", dfnp->fn_trigger->fn_name)); if (newfnp->fn_next != NULL) AUTOFS_DPRINT((10, "\tnext trigger is %s\n", newfnp->fn_next->fn_name)); else AUTOFS_DPRINT((10, "\tno next trigger\n")); } else VN_RELE(newvp); if (!error) success++; if (update_times) { gethrestime(&now); dfnp->fn_atime = dfnp->fn_mtime = now; } VN_RELE(mvp); } if (save_triggers) { /* * Make sure the parent can't be freed while it has triggers. */ VN_HOLD(dvp); } crfree(zcred); done: /* * Return failure if daemon didn't mount anything, and all * kernel mounts attempted failed. */ error = success ? 0 : ENOENT; if (alp != NULL) { if ((error == 0) && save_triggers) { /* * Save action_list information, so that we can use it * when it comes time to remount the trigger nodes * The action list is freed when the directory node * containing the reference to it is unmounted in * unmount_tree(). */ mutex_enter(&dfnp->fn_lock); ASSERT(dfnp->fn_alp == NULL); dfnp->fn_alp = alp; mutex_exit(&dfnp->fn_lock); } else { /* * free the action list now, */ xdr_free(xdr_action_list, (char *)alp); } } AUTOFS_DPRINT((5, "auto_perform_actions: error=%d\n", error)); return (error); } fnnode_t * auto_makefnnode( vtype_t type, vfs_t *vfsp, char *name, cred_t *cred, struct autofs_globals *fngp) { fnnode_t *fnp; vnode_t *vp; char *tmpname; timestruc_t now; /* * autofs uses odd inode numbers * automountd uses even inode numbers * * To preserve the age-old semantics that inum+devid is unique across * the system, this variable must be global across zones. */ static ino_t nodeid = 3; fnp = kmem_zalloc(sizeof (*fnp), KM_SLEEP); fnp->fn_vnode = vn_alloc(KM_SLEEP); vp = fntovn(fnp); tmpname = kmem_alloc(strlen(name) + 1, KM_SLEEP); (void) strcpy(tmpname, name); fnp->fn_name = &tmpname[0]; fnp->fn_namelen = (int)strlen(tmpname) + 1; /* include '\0' */ fnp->fn_uid = crgetuid(cred); fnp->fn_gid = crgetgid(cred); /* * ".." is added in auto_enter and auto_mount. * "." is added in auto_mkdir and auto_mount. */ /* * Note that fn_size and fn_linkcnt are already 0 since * we used kmem_zalloc to allocated fnp */ fnp->fn_mode = AUTOFS_MODE; gethrestime(&now); fnp->fn_atime = fnp->fn_mtime = fnp->fn_ctime = now; fnp->fn_ref_time = now.tv_sec; mutex_enter(&autofs_nodeid_lock); fnp->fn_nodeid = nodeid; nodeid += 2; fnp->fn_globals = fngp; fngp->fng_fnnode_count++; mutex_exit(&autofs_nodeid_lock); vn_setops(vp, auto_vnodeops); vp->v_type = type; vp->v_data = (void *)fnp; vp->v_vfsp = vfsp; mutex_init(&fnp->fn_lock, NULL, MUTEX_DEFAULT, NULL); rw_init(&fnp->fn_rwlock, NULL, RW_DEFAULT, NULL); cv_init(&fnp->fn_cv_mount, NULL, CV_DEFAULT, NULL); vn_exists(vp); return (fnp); } void auto_freefnnode(fnnode_t *fnp) { vnode_t *vp = fntovn(fnp); AUTOFS_DPRINT((4, "auto_freefnnode: fnp=%p\n", (void *)fnp)); ASSERT(fnp->fn_linkcnt == 0); ASSERT(vp->v_count == 0); ASSERT(fnp->fn_dirents == NULL); ASSERT(fnp->fn_parent == NULL); vn_invalid(vp); kmem_free(fnp->fn_name, fnp->fn_namelen); if (fnp->fn_symlink) { ASSERT(fnp->fn_flags & MF_THISUID_MATCH_RQD); kmem_free(fnp->fn_symlink, fnp->fn_symlinklen); } if (fnp->fn_cred) crfree(fnp->fn_cred); mutex_destroy(&fnp->fn_lock); rw_destroy(&fnp->fn_rwlock); cv_destroy(&fnp->fn_cv_mount); vn_free(vp); mutex_enter(&autofs_nodeid_lock); fnp->fn_globals->fng_fnnode_count--; mutex_exit(&autofs_nodeid_lock); kmem_free(fnp, sizeof (*fnp)); } void auto_disconnect( fnnode_t *dfnp, fnnode_t *fnp) { fnnode_t *tmp, **fnpp; vnode_t *vp = fntovn(fnp); timestruc_t now; AUTOFS_DPRINT((4, "auto_disconnect: dfnp=%p fnp=%p linkcnt=%d\n v_count=%d", (void *)dfnp, (void *)fnp, fnp->fn_linkcnt, vp->v_count)); ASSERT(RW_WRITE_HELD(&dfnp->fn_rwlock)); ASSERT(fnp->fn_linkcnt == 1); if (vn_mountedvfs(vp) != NULL) { cmn_err(CE_PANIC, "auto_disconnect: vp %p mounted on", (void *)vp); } /* * Decrement by 1 because we're removing the entry in dfnp. */ fnp->fn_linkcnt--; fnp->fn_size--; /* * only changed while holding parent's (dfnp) rw_lock */ fnp->fn_parent = NULL; fnpp = &dfnp->fn_dirents; for (;;) { tmp = *fnpp; if (tmp == NULL) { cmn_err(CE_PANIC, "auto_disconnect: %p not in %p dirent list", (void *)fnp, (void *)dfnp); } if (tmp == fnp) { *fnpp = tmp->fn_next; /* remove it from the list */ ASSERT(vp->v_count == 0); /* child had a pointer to parent ".." */ dfnp->fn_linkcnt--; dfnp->fn_size--; break; } fnpp = &tmp->fn_next; } mutex_enter(&fnp->fn_lock); gethrestime(&now); fnp->fn_atime = fnp->fn_mtime = now; mutex_exit(&fnp->fn_lock); AUTOFS_DPRINT((5, "auto_disconnect: done\n")); } int auto_enter(fnnode_t *dfnp, char *name, fnnode_t **fnpp, cred_t *cred) { struct fnnode *cfnp, **spp; vnode_t *dvp = fntovn(dfnp); ushort_t offset = 0; ushort_t diff; AUTOFS_DPRINT((4, "auto_enter: dfnp=%p, name=%s ", (void *)dfnp, name)); ASSERT(RW_WRITE_HELD(&dfnp->fn_rwlock)); cfnp = dfnp->fn_dirents; if (cfnp == NULL) { /* * offset = 0 for '.' and offset = 1 for '..' */ spp = &dfnp->fn_dirents; offset = 2; } for (; cfnp; cfnp = cfnp->fn_next) { if (strcmp(cfnp->fn_name, name) == 0) { mutex_enter(&cfnp->fn_lock); if (cfnp->fn_flags & MF_THISUID_MATCH_RQD) { /* * "thisuser" kind of node, need to * match CREDs as well */ mutex_exit(&cfnp->fn_lock); if (crcmp(cfnp->fn_cred, cred) == 0) return (EEXIST); } else { mutex_exit(&cfnp->fn_lock); return (EEXIST); } } if (cfnp->fn_next != NULL) { diff = (ushort_t) (cfnp->fn_next->fn_offset - cfnp->fn_offset); ASSERT(diff != 0); if (diff > 1 && offset == 0) { offset = (ushort_t)cfnp->fn_offset + 1; spp = &cfnp->fn_next; } } else if (offset == 0) { offset = (ushort_t)cfnp->fn_offset + 1; spp = &cfnp->fn_next; } } *fnpp = auto_makefnnode(VDIR, dvp->v_vfsp, name, cred, dfnp->fn_globals); if (*fnpp == NULL) return (ENOMEM); /* * I don't hold the mutex on fnpp because I created it, and * I'm already holding the writers lock for it's parent * directory, therefore nobody can reference it without me first * releasing the writers lock. */ (*fnpp)->fn_offset = offset; (*fnpp)->fn_next = *spp; *spp = *fnpp; (*fnpp)->fn_parent = dfnp; (*fnpp)->fn_linkcnt++; /* parent now holds reference to entry */ (*fnpp)->fn_size++; /* * dfnp->fn_linkcnt and dfnp->fn_size protected by dfnp->rw_lock */ dfnp->fn_linkcnt++; /* child now holds reference to parent '..' */ dfnp->fn_size++; dfnp->fn_ref_time = gethrestime_sec(); AUTOFS_DPRINT((5, "*fnpp=%p\n", (void *)*fnpp)); return (0); } int auto_search(fnnode_t *dfnp, char *name, fnnode_t **fnpp, cred_t *cred) { vnode_t *dvp; fnnode_t *p; int error = ENOENT, match = 0; AUTOFS_DPRINT((4, "auto_search: dfnp=%p, name=%s...\n", (void *)dfnp, name)); dvp = fntovn(dfnp); if (dvp->v_type != VDIR) { cmn_err(CE_PANIC, "auto_search: dvp=%p not a directory", (void *)dvp); } ASSERT(RW_LOCK_HELD(&dfnp->fn_rwlock)); for (p = dfnp->fn_dirents; p != NULL; p = p->fn_next) { if (strcmp(p->fn_name, name) == 0) { mutex_enter(&p->fn_lock); if (p->fn_flags & MF_THISUID_MATCH_RQD) { /* * "thisuser" kind of node * Need to match CREDs as well */ mutex_exit(&p->fn_lock); match = crcmp(p->fn_cred, cred) == 0; } else { /* * No need to check CRED */ mutex_exit(&p->fn_lock); match = 1; } } if (match) { error = 0; if (fnpp) { *fnpp = p; VN_HOLD(fntovn(*fnpp)); } break; } } AUTOFS_DPRINT((5, "auto_search: error=%d\n", error)); return (error); } /* * If dvp is mounted on, get path's vnode in the mounted on * filesystem. Path is relative to dvp, ie "./path". * If successful, *mvp points to a the held mountpoint vnode. */ /* ARGSUSED */ static int auto_getmntpnt( vnode_t *dvp, char *path, vnode_t **mvpp, /* vnode for mountpoint */ cred_t *cred) { int error = 0; vnode_t *newvp; char namebuf[TYPICALMAXPATHLEN]; struct pathname lookpn; vfs_t *vfsp; AUTOFS_DPRINT((4, "auto_getmntpnt: path=%s\n", path)); if (error = vn_vfsrlock_wait(dvp)) return (error); /* * Now that we have the vfswlock, check to see if dvp * is still mounted on. If not, then just bail out as * there is no need to remount the triggers since the * higher level mount point has gotten unmounted. */ vfsp = vn_mountedvfs(dvp); if (vfsp == NULL) { vn_vfsunlock(dvp); error = EBUSY; goto done; } /* * Since mounted on, lookup "path" in the new filesystem, * it is important that we do the filesystem jump here to * avoid lookuppn() calling auto_lookup on dvp and deadlock. */ error = VFS_ROOT(vfsp, &newvp); vn_vfsunlock(dvp); if (error) goto done; /* * We do a VN_HOLD on newvp just in case the first call to * lookuppnvp() fails with ENAMETOOLONG. We should still have a * reference to this vnode for the second call to lookuppnvp(). */ VN_HOLD(newvp); /* * Now create the pathname struct so we can make use of lookuppnvp, * and pn_getcomponent. * This code is similar to lookupname() in fs/lookup.c. */ error = pn_get_buf(path, UIO_SYSSPACE, &lookpn, namebuf, sizeof (namebuf)); if (error == 0) { error = lookuppnvp(&lookpn, NULL, NO_FOLLOW, NULLVPP, mvpp, rootdir, newvp, cred); } else VN_RELE(newvp); if (error == ENAMETOOLONG) { /* * This thread used a pathname > TYPICALMAXPATHLEN bytes long. * newvp is VN_RELE'd by this call to lookuppnvp. * * Using 'rootdir' in a zone's context is OK here: we already * ascertained that there are no '..'s in the path, and we're * not following symlinks. */ if ((error = pn_get(path, UIO_SYSSPACE, &lookpn)) == 0) { error = lookuppnvp(&lookpn, NULL, NO_FOLLOW, NULLVPP, mvpp, rootdir, newvp, cred); pn_free(&lookpn); } else VN_RELE(newvp); } else { /* * Need to release newvp here since we held it. */ VN_RELE(newvp); } done: AUTOFS_DPRINT((5, "auto_getmntpnt: path=%s *mvpp=%p error=%d\n", path, (void *)*mvpp, error)); return (error); } #define DEEPER(x) (((x)->fn_dirents != NULL) || \ (vn_mountedvfs(fntovn((x)))) != NULL) /* * The caller, should have already VN_RELE'd its reference to the * root vnode of this filesystem. */ static int auto_inkernel_unmount(vfs_t *vfsp) { vnode_t *cvp = vfsp->vfs_vnodecovered; int error; AUTOFS_DPRINT((4, "auto_inkernel_unmount: devid=%lx mntpnt(%p) count %u\n", vfsp->vfs_dev, (void *)cvp, cvp->v_count)); ASSERT(vn_vfswlock_held(cvp)); /* * Perform the unmount * The mountpoint has already been locked by the caller. */ error = dounmount(vfsp, 0, kcred); AUTOFS_DPRINT((5, "auto_inkernel_unmount: exit count %u\n", cvp->v_count)); return (error); } /* * unmounts trigger nodes in the kernel. */ static void unmount_triggers(fnnode_t *fnp, action_list **alp) { fnnode_t *tp, *next; int error = 0; vfs_t *vfsp; vnode_t *tvp; AUTOFS_DPRINT((4, "unmount_triggers: fnp=%p\n", (void *)fnp)); ASSERT(RW_WRITE_HELD(&fnp->fn_rwlock)); *alp = fnp->fn_alp; next = fnp->fn_trigger; while ((tp = next) != NULL) { tvp = fntovn(tp); ASSERT(tvp->v_count >= 2); next = tp->fn_next; /* * drop writer's lock since the unmount will end up * disconnecting this node from fnp and needs to acquire * the writer's lock again. * next has at least a reference count >= 2 since it's * a trigger node, therefore can not be accidentally freed * by a VN_RELE */ rw_exit(&fnp->fn_rwlock); vfsp = tvp->v_vfsp; /* * Its parent was holding a reference to it, since this * is a trigger vnode. */ VN_RELE(tvp); if (error = auto_inkernel_unmount(vfsp)) { cmn_err(CE_PANIC, "unmount_triggers: " "unmount of vp=%p failed error=%d", (void *)tvp, error); } /* * reacquire writer's lock */ rw_enter(&fnp->fn_rwlock, RW_WRITER); } /* * We were holding a reference to our parent. Drop that. */ VN_RELE(fntovn(fnp)); fnp->fn_trigger = NULL; fnp->fn_alp = NULL; AUTOFS_DPRINT((5, "unmount_triggers: finished\n")); } /* * This routine locks the mountpoint of every trigger node if they're * not busy, or returns EBUSY if any node is busy. If a trigger node should * be unmounted first, then it sets nfnp to point to it, otherwise nfnp * points to NULL. */ static int triggers_busy(fnnode_t *fnp, fnnode_t **nfnp) { int error = 0, done; int lck_error = 0; fnnode_t *tp, *t1p; vfs_t *vfsp; ASSERT(RW_WRITE_HELD(&fnp->fn_rwlock)); *nfnp = NULL; for (tp = fnp->fn_trigger; tp != NULL; tp = tp->fn_next) { AUTOFS_DPRINT((10, "\ttrigger: %s\n", tp->fn_name)); vfsp = fntovn(tp)->v_vfsp; error = 0; /* * The vn_vfsunlock will be done in auto_inkernel_unmount. */ lck_error = vn_vfswlock(vfsp->vfs_vnodecovered); if (lck_error == 0) { mutex_enter(&tp->fn_lock); ASSERT((tp->fn_flags & MF_LOOKUP) == 0); if (tp->fn_flags & MF_INPROG) { /* * a mount is in progress */ error = EBUSY; } mutex_exit(&tp->fn_lock); } if (lck_error || error || DEEPER(tp) || ((fntovn(tp))->v_count) > 2) { /* * couldn't lock it because it's busy, * It is mounted on or has dirents? * If reference count is greater than two, then * somebody else is holding a reference to this vnode. * One reference is for the mountpoint, and the second * is for the trigger node. */ AUTOFS_DPRINT((10, "\ttrigger busy\n")); if ((lck_error == 0) && (error == 0)) { *nfnp = tp; /* * The matching VN_RELE is done in * unmount_tree(). */ VN_HOLD(fntovn(*nfnp)); } /* * Unlock previously locked mountpoints */ for (done = 0, t1p = fnp->fn_trigger; !done; t1p = t1p->fn_next) { /* * Unlock all nodes previously * locked. All nodes up to 'tp' * were successfully locked. If 'lck_err' is * set, then 'tp' was not locked, and thus * should not be unlocked. If * 'lck_err' is not set, then 'tp' was * successfully locked, and it should * be unlocked. */ if (t1p != tp || !lck_error) { vfsp = fntovn(t1p)->v_vfsp; vn_vfsunlock(vfsp->vfs_vnodecovered); } done = (t1p == tp); } error = EBUSY; break; } } AUTOFS_DPRINT((4, "triggers_busy: error=%d\n", error)); return (error); } /* * Unlock previously locked trigger nodes. */ static int triggers_unlock(fnnode_t *fnp) { fnnode_t *tp; vfs_t *vfsp; ASSERT(RW_WRITE_HELD(&fnp->fn_rwlock)); for (tp = fnp->fn_trigger; tp != NULL; tp = tp->fn_next) { AUTOFS_DPRINT((10, "\tunlock trigger: %s\n", tp->fn_name)); vfsp = fntovn(tp)->v_vfsp; vn_vfsunlock(vfsp->vfs_vnodecovered); } return (0); } /* * It is the caller's responsibility to grab the VVFSLOCK. * Releases the VVFSLOCK upon return. */ static int unmount_node(vnode_t *cvp, int force) { int error = 0; fnnode_t *cfnp; vfs_t *vfsp; umntrequest ul; fninfo_t *fnip; AUTOFS_DPRINT((4, "\tunmount_node cvp=%p\n", (void *)cvp)); ASSERT(vn_vfswlock_held(cvp)); cfnp = vntofn(cvp); vfsp = vn_mountedvfs(cvp); if (force || cfnp->fn_flags & MF_IK_MOUNT) { /* * Mount was performed in the kernel, so * do an in-kernel unmount. auto_inkernel_unmount() * will vn_vfsunlock(cvp). */ error = auto_inkernel_unmount(vfsp); } else { zone_t *zone = NULL; refstr_t *mntpt, *resource; size_t mntoptslen; /* * Get the mnttab information of the node * and ask the daemon to unmount it. */ bzero(&ul, sizeof (ul)); mntfs_getmntopts(vfsp, &ul.mntopts, &mntoptslen); if (ul.mntopts == NULL) { auto_log(cfnp->fn_globals->fng_verbose, cfnp->fn_globals->fng_zoneid, CE_WARN, "unmount_node: " "no memory"); vn_vfsunlock(cvp); error = ENOMEM; goto done; } if (mntoptslen > AUTOFS_MAXOPTSLEN) ul.mntopts[AUTOFS_MAXOPTSLEN - 1] = '\0'; mntpt = vfs_getmntpoint(vfsp); ul.mntpnt = (char *)refstr_value(mntpt); resource = vfs_getresource(vfsp); ul.mntresource = (char *)refstr_value(resource); fnip = vfstofni(cvp->v_vfsp); ul.isdirect = fnip->fi_flags & MF_DIRECT ? TRUE : FALSE; /* * Since a zone'd automountd's view of the autofs mount points * differs from those in the kernel, we need to make sure we * give it consistent mount points. */ ASSERT(fnip->fi_zoneid == getzoneid()); zone = curproc->p_zone; if (fnip->fi_zoneid != GLOBAL_ZONEID) { if (ZONE_PATH_VISIBLE(ul.mntpnt, zone)) { ul.mntpnt = ZONE_PATH_TRANSLATE(ul.mntpnt, zone); } if (ZONE_PATH_VISIBLE(ul.mntresource, zone)) { ul.mntresource = ZONE_PATH_TRANSLATE(ul.mntresource, zone); } } ul.fstype = vfssw[vfsp->vfs_fstype].vsw_name; vn_vfsunlock(cvp); error = auto_send_unmount_request(fnip, &ul, FALSE); kmem_free(ul.mntopts, mntoptslen); refstr_rele(mntpt); refstr_rele(resource); } done: AUTOFS_DPRINT((5, "\tunmount_node cvp=%p error=%d\n", (void *)cvp, error)); return (error); } /* * vp is the "root" of the AUTOFS filesystem. * return EBUSY if any thread is holding a reference to this vnode * other than us. */ static int check_auto_node(vnode_t *vp) { fnnode_t *fnp; int error = 0; /* * number of references to expect for * a non-busy vnode. */ uint_t count; AUTOFS_DPRINT((4, "\tcheck_auto_node vp=%p ", (void *)vp)); fnp = vntofn(vp); ASSERT(fnp->fn_flags & MF_INPROG); ASSERT((fnp->fn_flags & MF_LOOKUP) == 0); count = 1; /* we are holding a reference to vp */ if (fnp->fn_flags & MF_TRIGGER) { /* * parent holds a pointer to us (trigger) */ count++; } if (fnp->fn_trigger != NULL) { /* * The trigger nodes have a hold on us. */ count++; } mutex_enter(&vp->v_lock); if (vp->v_flag & VROOT) count++; ASSERT(vp->v_count > 0); AUTOFS_DPRINT((10, "\tcount=%u ", vp->v_count)); if (vp->v_count > count) error = EBUSY; mutex_exit(&vp->v_lock); AUTOFS_DPRINT((5, "\tcheck_auto_node error=%d ", error)); return (error); } /* * rootvp is the root of the AUTOFS filesystem. * If rootvp is busy (v_count > 1) returns EBUSY. * else removes every vnode under this tree. * ASSUMPTION: Assumes that the only node which can be busy is * the root vnode. This filesystem better be two levels deep only, * the root and its immediate subdirs. * The daemon will "AUTOFS direct-mount" only one level below the root. */ static int unmount_autofs(vnode_t *rootvp) { fnnode_t *fnp, *rootfnp, *nfnp; int error; AUTOFS_DPRINT((4, "\tunmount_autofs rootvp=%p ", (void *)rootvp)); error = check_auto_node(rootvp); if (error == 0) { /* * Remove all its immediate subdirectories. */ rootfnp = vntofn(rootvp); rw_enter(&rootfnp->fn_rwlock, RW_WRITER); nfnp = NULL; /* lint clean */ for (fnp = rootfnp->fn_dirents; fnp != NULL; fnp = nfnp) { ASSERT(fntovn(fnp)->v_count == 0); ASSERT(fnp->fn_dirents == NULL); ASSERT(fnp->fn_linkcnt == 2); fnp->fn_linkcnt--; auto_disconnect(rootfnp, fnp); nfnp = fnp->fn_next; auto_freefnnode(fnp); } rw_exit(&rootfnp->fn_rwlock); } AUTOFS_DPRINT((5, "\tunmount_autofs error=%d ", error)); return (error); } /* * max number of unmount threads running */ static int autofs_unmount_threads = 5; /* * XXX unmount_tree() is not suspend-safe within the scope of * the present model defined for cpr to suspend the system. Calls made * by the unmount_tree() that have been identified to be unsafe are * (1) RPC client handle setup and client calls to automountd which can * block deep down in the RPC library, (2) kmem_alloc() calls with the * KM_SLEEP flag which can block if memory is low, and (3) VFS_*() and * VOP_*() calls which can result in over the wire calls to servers. * The thread should be completely reevaluated to make it suspend-safe in * case of future updates to the cpr model. */ void unmount_tree(struct autofs_globals *fngp, int force) { vnode_t *vp, *newvp; vfs_t *vfsp; fnnode_t *fnp, *nfnp, *pfnp; action_list *alp; int error, ilocked_it = 0; fninfo_t *fnip; time_t ref_time; int autofs_busy_root, unmount_as_unit, unmount_done = 0; timestruc_t now; callb_cpr_t cprinfo; kmutex_t unmount_tree_cpr_lock; mutex_init(&unmount_tree_cpr_lock, NULL, MUTEX_DEFAULT, NULL); CALLB_CPR_INIT(&cprinfo, &unmount_tree_cpr_lock, callb_generic_cpr, "unmount_tree"); /* * Got to release lock before attempting unmount in case * it hangs. */ rw_enter(&fngp->fng_rootfnnodep->fn_rwlock, RW_READER); if ((fnp = fngp->fng_rootfnnodep->fn_dirents) == NULL) { ASSERT(fngp->fng_fnnode_count == 1); /* * no autofs mounted, done. */ rw_exit(&fngp->fng_rootfnnodep->fn_rwlock); goto done; } VN_HOLD(fntovn(fnp)); rw_exit(&fngp->fng_rootfnnodep->fn_rwlock); vp = fntovn(fnp); fnip = vfstofni(vp->v_vfsp); /* * autofssys() will be calling in from the global zone and doing * work on the behalf of the given zone, hence we can't always assert * that we have the right credentials, nor that the caller is always in * the correct zone. * * We do, however, know that if this is a "forced unmount" operation * (which autofssys() does), then we won't go down to the krpc layers, * so we don't need to fudge with the credentials. */ ASSERT(force || fnip->fi_zoneid == getzoneid()); if (!force && auto_null_request(fnip, FALSE) != 0) { /* * automountd not running in this zone, * don't attempt unmounting this round. */ VN_RELE(vp); goto done; } /* reference time for this unmount round */ ref_time = gethrestime_sec(); /* * If this an autofssys() call, we need to make sure we don't skip * nodes because we think we saw them recently. */ mutex_enter(&fnp->fn_lock); if (force && fnp->fn_unmount_ref_time >= ref_time) ref_time = fnp->fn_unmount_ref_time + 1; mutex_exit(&fnp->fn_lock); AUTOFS_DPRINT((4, "unmount_tree (ID=%ld)\n", ref_time)); top: AUTOFS_DPRINT((10, "unmount_tree: %s\n", fnp->fn_name)); ASSERT(fnp); vp = fntovn(fnp); if (vp->v_type == VLNK) { /* * can't unmount symbolic links */ goto next; } fnip = vfstofni(vp->v_vfsp); ASSERT(vp->v_count > 0); error = 0; autofs_busy_root = unmount_as_unit = 0; alp = NULL; ilocked_it = 0; mutex_enter(&fnp->fn_lock); if (fnp->fn_flags & (MF_INPROG | MF_LOOKUP)) { /* * Either a mount, lookup or another unmount of this * subtree is in progress, don't attempt to unmount at * this time. */ mutex_exit(&fnp->fn_lock); error = EBUSY; goto next; } if (fnp->fn_unmount_ref_time >= ref_time) { /* * Already been here, try next node. */ mutex_exit(&fnp->fn_lock); error = EBUSY; goto next; } fnp->fn_unmount_ref_time = ref_time; /* * If forced operation ignore timeout values */ if (!force && fnp->fn_ref_time + fnip->fi_mount_to > gethrestime_sec()) { /* * Node has been referenced recently, try the * unmount of its children if any. */ mutex_exit(&fnp->fn_lock); AUTOFS_DPRINT((10, "fn_ref_time within range\n")); rw_enter(&fnp->fn_rwlock, RW_READER); if (fnp->fn_dirents) { /* * Has subdirectory, attempt their * unmount first */ nfnp = fnp->fn_dirents; VN_HOLD(fntovn(nfnp)); rw_exit(&fnp->fn_rwlock); VN_RELE(vp); fnp = nfnp; goto top; } rw_exit(&fnp->fn_rwlock); /* * No children, try next node. */ error = EBUSY; goto next; } AUTOFS_BLOCK_OTHERS(fnp, MF_INPROG); fnp->fn_error = 0; mutex_exit(&fnp->fn_lock); ilocked_it = 1; rw_enter(&fnp->fn_rwlock, RW_WRITER); if (fnp->fn_trigger != NULL) { unmount_as_unit = 1; if ((vn_mountedvfs(vp) == NULL) && (check_auto_node(vp))) { /* * AUTOFS mountpoint is busy, there's * no point trying to unmount. Fall through * to attempt to unmount subtrees rooted * at a possible trigger node, but remember * not to unmount this tree. */ autofs_busy_root = 1; } if (triggers_busy(fnp, &nfnp)) { rw_exit(&fnp->fn_rwlock); if (nfnp == NULL) { error = EBUSY; goto next; } /* * nfnp is busy, try to unmount it first */ mutex_enter(&fnp->fn_lock); AUTOFS_UNBLOCK_OTHERS(fnp, MF_INPROG); mutex_exit(&fnp->fn_lock); VN_RELE(vp); ASSERT(fntovn(nfnp)->v_count > 1); fnp = nfnp; goto top; } /* * At this point, we know all trigger nodes are locked, * and they're not busy or mounted on. */ if (autofs_busy_root) { /* * Got to unlock the the trigger nodes since * I'm not really going to unmount the filesystem. */ (void) triggers_unlock(fnp); } else { /* * Attempt to unmount all the trigger nodes, * save the action_list in case we need to * remount them later. The action_list will be * freed later if there was no need to remount the * trigger nodes. */ unmount_triggers(fnp, &alp); } } rw_exit(&fnp->fn_rwlock); if (autofs_busy_root) goto next; (void) vn_vfswlock_wait(vp); vfsp = vn_mountedvfs(vp); if (vfsp != NULL) { /* * Node is mounted on. */ AUTOFS_DPRINT((10, "\tNode is mounted on\n")); /* * Deal with /xfn/host/jurassic alikes here... */ if (vfs_matchops(vfsp, vfs_getops(vp->v_vfsp))) { /* * If the filesystem mounted here is AUTOFS, and it * is busy, try to unmount the tree rooted on it * first. We know this call to VFS_ROOT is safe to * call while holding VVFSLOCK, since it resolves * to a call to auto_root(). */ AUTOFS_DPRINT((10, "\t\tAUTOFS mounted here\n")); if (VFS_ROOT(vfsp, &newvp)) { cmn_err(CE_PANIC, "unmount_tree: VFS_ROOT(vfs=%p) failed", (void *)vfsp); } nfnp = vntofn(newvp); if (DEEPER(nfnp)) { vn_vfsunlock(vp); mutex_enter(&fnp->fn_lock); AUTOFS_UNBLOCK_OTHERS(fnp, MF_INPROG); mutex_exit(&fnp->fn_lock); VN_RELE(vp); fnp = nfnp; goto top; } /* * Fall through to unmount this filesystem */ VN_RELE(newvp); } /* * vn_vfsunlock(vp) is done inside unmount_node() */ error = unmount_node(vp, force); if (error == ECONNRESET) { AUTOFS_DPRINT((10, "\tConnection dropped\n")); if (vn_mountedvfs(vp) == NULL) { /* * The filesystem was unmounted before the * daemon died. Unfortunately we can not * determine whether all the cleanup work was * successfully finished (i.e. update mnttab, * or notify NFS server of the unmount). * We should not retry the operation since the * filesystem has already been unmounted, and * may have already been removed from mnttab, * in such case the devid/rdevid we send to * the daemon will not be matched. So we have * to be content with the partial unmount. * Since the mountpoint is no longer covered, we * clear the error condition. */ error = 0; auto_log(fngp->fng_verbose, fngp->fng_zoneid, CE_WARN, "unmount_tree: automountd connection " "dropped"); if (fnip->fi_flags & MF_DIRECT) { auto_log(fngp->fng_verbose, fngp->fng_zoneid, CE_WARN, "unmount_tree: " "%s successfully unmounted - " "do not remount triggers", fnip->fi_path); } else { auto_log(fngp->fng_verbose, fngp->fng_zoneid, CE_WARN, "unmount_tree: " "%s/%s successfully unmounted - " "do not remount triggers", fnip->fi_path, fnp->fn_name); } } } } else { vn_vfsunlock(vp); AUTOFS_DPRINT((10, "\tNode is AUTOFS\n")); if (unmount_as_unit) { AUTOFS_DPRINT((10, "\tunmount as unit\n")); error = unmount_autofs(vp); } else { AUTOFS_DPRINT((10, "\tunmount one at a time\n")); rw_enter(&fnp->fn_rwlock, RW_READER); if (fnp->fn_dirents != NULL) { /* * Has subdirectory, attempt their * unmount first */ nfnp = fnp->fn_dirents; VN_HOLD(fntovn(nfnp)); rw_exit(&fnp->fn_rwlock); mutex_enter(&fnp->fn_lock); AUTOFS_UNBLOCK_OTHERS(fnp, MF_INPROG); mutex_exit(&fnp->fn_lock); VN_RELE(vp); fnp = nfnp; goto top; } rw_exit(&fnp->fn_rwlock); goto next; } } if (error) { AUTOFS_DPRINT((10, "\tUnmount failed\n")); if (alp != NULL) { /* * Unmount failed, got to remount triggers. */ ASSERT((fnp->fn_flags & MF_THISUID_MATCH_RQD) == 0); error = auto_perform_actions(fnip, fnp, alp, CRED()); if (error) { auto_log(fngp->fng_verbose, fngp->fng_zoneid, CE_WARN, "autofs: can't remount " "triggers fnp=%p error=%d", (void *)fnp, error); error = 0; /* * The action list should have been * free'd by auto_perform_actions * since an error occured */ alp = NULL; } } } else { /* * The unmount succeeded, which will cause this node to * be removed from its parent if its an indirect mount, * therefore update the parent's atime and mtime now. * I don't update them in auto_disconnect() because I * don't want atime and mtime changing every time a * lookup goes to the daemon and creates a new node. */ unmount_done = 1; if ((fnip->fi_flags & MF_DIRECT) == 0) { gethrestime(&now); if (fnp->fn_parent == fngp->fng_rootfnnodep) fnp->fn_atime = fnp->fn_mtime = now; else fnp->fn_parent->fn_atime = fnp->fn_parent->fn_mtime = now; } /* * Free the action list here */ if (alp != NULL) { xdr_free(xdr_action_list, (char *)alp); alp = NULL; } } fnp->fn_ref_time = gethrestime_sec(); next: /* * Obtain parent's readers lock before grabbing * reference to next sibling. * XXX Note that nodes in the top level list (mounted * in user space not by the daemon in the kernel) parent is itself, * therefore grabbing the lock makes no sense, but doesn't * hurt either. */ pfnp = fnp->fn_parent; ASSERT(pfnp != NULL); rw_enter(&pfnp->fn_rwlock, RW_READER); if ((nfnp = fnp->fn_next) != NULL) VN_HOLD(fntovn(nfnp)); rw_exit(&pfnp->fn_rwlock); if (ilocked_it) { mutex_enter(&fnp->fn_lock); if (unmount_done) { /* * Other threads may be waiting for this unmount to * finish. We must let it know that in order to * proceed, it must trigger the mount itself. */ fnp->fn_flags &= ~MF_IK_MOUNT; if (fnp->fn_flags & MF_WAITING) fnp->fn_error = EAGAIN; unmount_done = 0; } AUTOFS_UNBLOCK_OTHERS(fnp, MF_INPROG); mutex_exit(&fnp->fn_lock); ilocked_it = 0; } if (nfnp != NULL) { VN_RELE(vp); fnp = nfnp; /* * Unmount next element */ goto top; } /* * We don't want to unmount rootfnnodep, so the check is made here */ ASSERT(pfnp != fnp); if (pfnp != fngp->fng_rootfnnodep) { /* * Now attempt to unmount my parent */ VN_HOLD(fntovn(pfnp)); VN_RELE(vp); fnp = pfnp; goto top; } VN_RELE(vp); /* * At this point we've walked the entire tree and attempted to unmount * as much as we can one level at a time. */ done: mutex_enter(&unmount_tree_cpr_lock); CALLB_CPR_EXIT(&cprinfo); mutex_destroy(&unmount_tree_cpr_lock); } static void unmount_zone_tree(struct autofs_globals *fngp) { unmount_tree(fngp, 0); mutex_enter(&fngp->fng_unmount_threads_lock); fngp->fng_unmount_threads--; mutex_exit(&fngp->fng_unmount_threads_lock); AUTOFS_DPRINT((5, "unmount_tree done. Thread exiting.\n")); zthread_exit(); /* NOTREACHED */ } static int autofs_unmount_thread_timer = 120; /* in seconds */ void auto_do_unmount(struct autofs_globals *fngp) { callb_cpr_t cprinfo; clock_t timeleft; zone_t *zone = curproc->p_zone; CALLB_CPR_INIT(&cprinfo, &fngp->fng_unmount_threads_lock, callb_generic_cpr, "auto_do_unmount"); for (;;) { /* forever */ mutex_enter(&fngp->fng_unmount_threads_lock); CALLB_CPR_SAFE_BEGIN(&cprinfo); newthread: mutex_exit(&fngp->fng_unmount_threads_lock); timeleft = zone_status_timedwait(zone, lbolt + autofs_unmount_thread_timer * hz, ZONE_IS_SHUTTING_DOWN); mutex_enter(&fngp->fng_unmount_threads_lock); if (timeleft != -1) { /* didn't time out */ ASSERT(zone_status_get(zone) >= ZONE_IS_SHUTTING_DOWN); /* * zone is exiting... don't create any new threads. * fng_unmount_threads_lock is released implicitly by * the below. */ CALLB_CPR_SAFE_END(&cprinfo, &fngp->fng_unmount_threads_lock); CALLB_CPR_EXIT(&cprinfo); zthread_exit(); /* NOTREACHED */ } if (fngp->fng_unmount_threads < autofs_unmount_threads) { fngp->fng_unmount_threads++; CALLB_CPR_SAFE_END(&cprinfo, &fngp->fng_unmount_threads_lock); mutex_exit(&fngp->fng_unmount_threads_lock); (void) zthread_create(NULL, 0, unmount_zone_tree, fngp, 0, minclsyspri); } else goto newthread; } /* NOTREACHED */ } /* * Is nobrowse specified in option string? * opts should be a null ('\0') terminated string. * Returns non-zero if nobrowse has been specified. */ int auto_nobrowse_option(char *opts) { char *buf; char *p; char *t; int nobrowse = 0; int last_opt = 0; size_t len; len = strlen(opts) + 1; p = buf = kmem_alloc(len, KM_SLEEP); (void) strcpy(buf, opts); do { if (t = strchr(p, ',')) *t++ = '\0'; else last_opt++; if (strcmp(p, MNTOPT_NOBROWSE) == 0) nobrowse = 1; else if (strcmp(p, MNTOPT_BROWSE) == 0) nobrowse = 0; p = t; } while (!last_opt); kmem_free(buf, len); return (nobrowse); } /* * used to log warnings only if automountd is running * with verbose mode set */ void auto_log(int verbose, zoneid_t zoneid, int level, const char *fmt, ...) { va_list args; if (verbose) { va_start(args, fmt); vzcmn_err(zoneid, level, fmt, args); va_end(args); } } #ifdef DEBUG static int autofs_debug = 0; /* * Utilities used by both client and server * Standard levels: * 0) no debugging * 1) hard failures * 2) soft failures * 3) current test software * 4) main procedure entry points * 5) main procedure exit points * 6) utility procedure entry points * 7) utility procedure exit points * 8) obscure procedure entry points * 9) obscure procedure exit points * 10) random stuff * 11) all <= 1 * 12) all <= 2 * 13) all <= 3 * ... */ /* PRINTFLIKE2 */ void auto_dprint(int level, const char *fmt, ...) { va_list args; if (autofs_debug == level || (autofs_debug > 10 && (autofs_debug - 10) >= level)) { va_start(args, fmt); (void) vprintf(fmt, args); va_end(args); } } #endif /* DEBUG */