/* * 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 (c) 1986, 2010, Oracle and/or its affiliates. All rights reserved. */ /* * Copyright (c) 1983,1984,1985,1986,1987,1988,1989 AT&T. * All Rights Reserved */ #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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* * Arguments to page-flush thread. */ typedef struct { vnode_t *vp; cred_t *cr; } pgflush_t; #ifdef DEBUG int nfs4_client_lease_debug; int nfs4_sharedfh_debug; int nfs4_fname_debug; /* temporary: panic if v_type is inconsistent with r_attr va_type */ int nfs4_vtype_debug; uint_t nfs4_tsd_key; #endif static time_t nfs4_client_resumed = 0; static callb_id_t cid = 0; static int nfs4renew(nfs4_server_t *); static void nfs4_attrcache_va(vnode_t *, nfs4_ga_res_t *, int); static void nfs4_pgflush_thread(pgflush_t *); static boolean_t nfs4_client_cpr_callb(void *, int); struct mi4_globals { kmutex_t mig_lock; /* lock protecting mig_list */ list_t mig_list; /* list of NFS v4 mounts in zone */ boolean_t mig_destructor_called; }; static zone_key_t mi4_list_key; /* * Attributes caching: * * Attributes are cached in the rnode in struct vattr form. * There is a time associated with the cached attributes (r_time_attr_inval) * which tells whether the attributes are valid. The time is initialized * to the difference between current time and the modify time of the vnode * when new attributes are cached. This allows the attributes for * files that have changed recently to be timed out sooner than for files * that have not changed for a long time. There are minimum and maximum * timeout values that can be set per mount point. */ /* * If a cache purge is in progress, wait for it to finish. * * The current thread must not be in the middle of an * nfs4_start_op/nfs4_end_op region. Otherwise, there could be a deadlock * between this thread, a recovery thread, and the page flush thread. */ int nfs4_waitfor_purge_complete(vnode_t *vp) { rnode4_t *rp; k_sigset_t smask; rp = VTOR4(vp); if ((rp->r_serial != NULL && rp->r_serial != curthread) || ((rp->r_flags & R4PGFLUSH) && rp->r_pgflush != curthread)) { mutex_enter(&rp->r_statelock); sigintr(&smask, VTOMI4(vp)->mi_flags & MI4_INT); while ((rp->r_serial != NULL && rp->r_serial != curthread) || ((rp->r_flags & R4PGFLUSH) && rp->r_pgflush != curthread)) { if (!cv_wait_sig(&rp->r_cv, &rp->r_statelock)) { sigunintr(&smask); mutex_exit(&rp->r_statelock); return (EINTR); } } sigunintr(&smask); mutex_exit(&rp->r_statelock); } return (0); } /* * Validate caches by checking cached attributes. If they have timed out, * then get new attributes from the server. As a side effect, cache * invalidation is done if the attributes have changed. * * If the attributes have not timed out and if there is a cache * invalidation being done by some other thread, then wait until that * thread has completed the cache invalidation. */ int nfs4_validate_caches(vnode_t *vp, cred_t *cr) { int error; nfs4_ga_res_t gar; if (ATTRCACHE4_VALID(vp)) { error = nfs4_waitfor_purge_complete(vp); if (error) return (error); return (0); } return (nfs4_getattr_otw(vp, &gar, cr, 0)); } /* * Fill in attribute from the cache. * If valid, then return 0 to indicate that no error occurred, * otherwise return 1 to indicate that an error occurred. */ static int nfs4_getattr_cache(vnode_t *vp, struct vattr *vap) { rnode4_t *rp; rp = VTOR4(vp); mutex_enter(&rp->r_statelock); mutex_enter(&rp->r_statev4_lock); if (ATTRCACHE4_VALID(vp)) { mutex_exit(&rp->r_statev4_lock); /* * Cached attributes are valid */ *vap = rp->r_attr; mutex_exit(&rp->r_statelock); return (0); } mutex_exit(&rp->r_statev4_lock); mutex_exit(&rp->r_statelock); return (1); } /* * If returned error is ESTALE flush all caches. The nfs4_purge_caches() * call is synchronous because all the pages were invalidated by the * nfs4_invalidate_pages() call. */ void nfs4_purge_stale_fh(int errno, vnode_t *vp, cred_t *cr) { struct rnode4 *rp = VTOR4(vp); /* Ensure that the ..._end_op() call has been done */ ASSERT(tsd_get(nfs4_tsd_key) == NULL); if (errno != ESTALE) return; mutex_enter(&rp->r_statelock); rp->r_flags |= R4STALE; if (!rp->r_error) rp->r_error = errno; mutex_exit(&rp->r_statelock); if (nfs4_has_pages(vp)) nfs4_invalidate_pages(vp, (u_offset_t)0, cr); nfs4_purge_caches(vp, NFS4_PURGE_DNLC, cr, FALSE); } /* * Purge all of the various NFS `data' caches. If "asyncpg" is TRUE, the * page purge is done asynchronously. */ void nfs4_purge_caches(vnode_t *vp, int purge_dnlc, cred_t *cr, int asyncpg) { rnode4_t *rp; char *contents; vnode_t *xattr; int size; int pgflush; /* are we the page flush thread? */ /* * Purge the DNLC for any entries which refer to this file. */ if (vp->v_count > 1 && (vp->v_type == VDIR || purge_dnlc == NFS4_PURGE_DNLC)) dnlc_purge_vp(vp); /* * Clear any readdir state bits and purge the readlink response cache. */ rp = VTOR4(vp); mutex_enter(&rp->r_statelock); rp->r_flags &= ~R4LOOKUP; contents = rp->r_symlink.contents; size = rp->r_symlink.size; rp->r_symlink.contents = NULL; xattr = rp->r_xattr_dir; rp->r_xattr_dir = NULL; /* * Purge pathconf cache too. */ rp->r_pathconf.pc4_xattr_valid = 0; rp->r_pathconf.pc4_cache_valid = 0; pgflush = (curthread == rp->r_pgflush); mutex_exit(&rp->r_statelock); if (contents != NULL) { kmem_free((void *)contents, size); } if (xattr != NULL) VN_RELE(xattr); /* * Flush the page cache. If the current thread is the page flush * thread, don't initiate a new page flush. There's no need for * it, and doing it correctly is hard. */ if (nfs4_has_pages(vp) && !pgflush) { if (!asyncpg) { (void) nfs4_waitfor_purge_complete(vp); nfs4_flush_pages(vp, cr); } else { pgflush_t *args; /* * We don't hold r_statelock while creating the * thread, in case the call blocks. So we use a * flag to indicate that a page flush thread is * active. */ mutex_enter(&rp->r_statelock); if (rp->r_flags & R4PGFLUSH) { mutex_exit(&rp->r_statelock); } else { rp->r_flags |= R4PGFLUSH; mutex_exit(&rp->r_statelock); args = kmem_alloc(sizeof (pgflush_t), KM_SLEEP); args->vp = vp; VN_HOLD(args->vp); args->cr = cr; crhold(args->cr); (void) zthread_create(NULL, 0, nfs4_pgflush_thread, args, 0, minclsyspri); } } } /* * Flush the readdir response cache. */ nfs4_purge_rddir_cache(vp); } /* * Invalidate all pages for the given file, after writing back the dirty * ones. */ void nfs4_flush_pages(vnode_t *vp, cred_t *cr) { int error; rnode4_t *rp = VTOR4(vp); error = VOP_PUTPAGE(vp, (u_offset_t)0, 0, B_INVAL, cr, NULL); if (error == ENOSPC || error == EDQUOT) { mutex_enter(&rp->r_statelock); if (!rp->r_error) rp->r_error = error; mutex_exit(&rp->r_statelock); } } /* * Page flush thread. */ static void nfs4_pgflush_thread(pgflush_t *args) { rnode4_t *rp = VTOR4(args->vp); /* remember which thread we are, so we don't deadlock ourselves */ mutex_enter(&rp->r_statelock); ASSERT(rp->r_pgflush == NULL); rp->r_pgflush = curthread; mutex_exit(&rp->r_statelock); nfs4_flush_pages(args->vp, args->cr); mutex_enter(&rp->r_statelock); rp->r_pgflush = NULL; rp->r_flags &= ~R4PGFLUSH; cv_broadcast(&rp->r_cv); mutex_exit(&rp->r_statelock); VN_RELE(args->vp); crfree(args->cr); kmem_free(args, sizeof (pgflush_t)); zthread_exit(); } /* * Purge the readdir cache of all entries which are not currently * being filled. */ void nfs4_purge_rddir_cache(vnode_t *vp) { rnode4_t *rp; rp = VTOR4(vp); mutex_enter(&rp->r_statelock); rp->r_direof = NULL; rp->r_flags &= ~R4LOOKUP; rp->r_flags |= R4READDIRWATTR; rddir4_cache_purge(rp); mutex_exit(&rp->r_statelock); } /* * Set attributes cache for given vnode using virtual attributes. There is * no cache validation, but if the attributes are deemed to be stale, they * are ignored. This corresponds to nfs3_attrcache(). * * Set the timeout value on the attribute cache and fill it * with the passed in attributes. */ void nfs4_attrcache_noinval(vnode_t *vp, nfs4_ga_res_t *garp, hrtime_t t) { rnode4_t *rp = VTOR4(vp); mutex_enter(&rp->r_statelock); if (rp->r_time_attr_saved <= t) nfs4_attrcache_va(vp, garp, FALSE); mutex_exit(&rp->r_statelock); } /* * Use the passed in virtual attributes to check to see whether the * data and metadata caches are valid, cache the new attributes, and * then do the cache invalidation if required. * * The cache validation and caching of the new attributes is done * atomically via the use of the mutex, r_statelock. If required, * the cache invalidation is done atomically w.r.t. the cache * validation and caching of the attributes via the pseudo lock, * r_serial. * * This routine is used to do cache validation and attributes caching * for operations with a single set of post operation attributes. */ void nfs4_attr_cache(vnode_t *vp, nfs4_ga_res_t *garp, hrtime_t t, cred_t *cr, int async, change_info4 *cinfo) { rnode4_t *rp; int mtime_changed = 0; int ctime_changed = 0; vsecattr_t *vsp; int was_serial, set_time_cache_inval, recov; vattr_t *vap = &garp->n4g_va; mntinfo4_t *mi = VTOMI4(vp); len_t preattr_rsize; boolean_t writemodify_set = B_FALSE; boolean_t cachepurge_set = B_FALSE; ASSERT(mi->mi_vfsp->vfs_dev == garp->n4g_va.va_fsid); /* Is curthread the recovery thread? */ mutex_enter(&mi->mi_lock); recov = (VTOMI4(vp)->mi_recovthread == curthread); mutex_exit(&mi->mi_lock); rp = VTOR4(vp); mutex_enter(&rp->r_statelock); was_serial = (rp->r_serial == curthread); if (rp->r_serial != NULL && !was_serial) { /* * Purge current attrs and bail out to avoid potential deadlock * between another thread caching attrs (r_serial thread), this * thread, and a thread trying to read or write pages. */ PURGE_ATTRCACHE4_LOCKED(rp); mutex_exit(&rp->r_statelock); return; } /* * If there is a page flush thread, the current thread needs to * bail out, to prevent a possible deadlock between the current * thread (which might be in a start_op/end_op region), the * recovery thread, and the page flush thread. Expire the * attribute cache, so that any attributes the current thread was * going to set are not lost. */ if ((rp->r_flags & R4PGFLUSH) && rp->r_pgflush != curthread) { PURGE_ATTRCACHE4_LOCKED(rp); mutex_exit(&rp->r_statelock); return; } if (rp->r_time_attr_saved > t) { /* * Attributes have been cached since these attributes were * probably made. If there is an inconsistency in what is * cached, mark them invalid. If not, don't act on them. */ if (!CACHE4_VALID(rp, vap->va_mtime, vap->va_size)) PURGE_ATTRCACHE4_LOCKED(rp); mutex_exit(&rp->r_statelock); return; } set_time_cache_inval = 0; if (cinfo) { /* * Only directory modifying callers pass non-NULL cinfo. */ ASSERT(vp->v_type == VDIR); /* * If the cache timeout either doesn't exist or hasn't expired, * and dir didn't changed on server before dirmod op * and dir didn't change after dirmod op but before getattr * then there's a chance that the client's cached data for * this object is current (not stale). No immediate cache * flush is required. * */ if ((! rp->r_time_cache_inval || t < rp->r_time_cache_inval) && cinfo->before == rp->r_change && (garp->n4g_change_valid && cinfo->after == garp->n4g_change)) { /* * If atomic isn't set, then the before/after info * cannot be blindly trusted. For this case, we tell * nfs4_attrcache_va to cache the attrs but also * establish an absolute maximum cache timeout. When * the timeout is reached, caches will be flushed. */ if (! cinfo->atomic) set_time_cache_inval = 1; } else { /* * We're not sure exactly what changed, but we know * what to do. flush all caches for dir. remove the * attr timeout. * * a) timeout expired. flush all caches. * b) r_change != cinfo.before. flush all caches. * c) r_change == cinfo.before, but cinfo.after != * post-op getattr(change). flush all caches. * d) post-op getattr(change) not provided by server. * flush all caches. */ mtime_changed = 1; ctime_changed = 1; rp->r_time_cache_inval = 0; } } else { /* * Write thread after writing data to file on remote server, * will always set R4WRITEMODIFIED to indicate that file on * remote server was modified with a WRITE operation and would * have marked attribute cache as timed out. If R4WRITEMODIFIED * is set, then do not check for mtime and ctime change. */ if (!(rp->r_flags & R4WRITEMODIFIED)) { if (!CACHE4_VALID(rp, vap->va_mtime, vap->va_size)) mtime_changed = 1; if (rp->r_attr.va_ctime.tv_sec != vap->va_ctime.tv_sec || rp->r_attr.va_ctime.tv_nsec != vap->va_ctime.tv_nsec) ctime_changed = 1; /* * If the change attribute was not provided by server * or it differs, then flush all caches. */ if (!garp->n4g_change_valid || rp->r_change != garp->n4g_change) { mtime_changed = 1; ctime_changed = 1; } } else { writemodify_set = B_TRUE; } } preattr_rsize = rp->r_size; nfs4_attrcache_va(vp, garp, set_time_cache_inval); /* * If we have updated filesize in nfs4_attrcache_va, as soon as we * drop statelock we will be in transition of purging all * our caches and updating them. It is possible for another * thread to pick this new file size and read in zeroed data. * stall other threads till cache purge is complete. */ if ((!cinfo) && (rp->r_size != preattr_rsize)) { /* * If R4WRITEMODIFIED was set and we have updated the file * size, Server's returned file size need not necessarily * be because of this Client's WRITE. We need to purge * all caches. */ if (writemodify_set) mtime_changed = 1; if (mtime_changed && !(rp->r_flags & R4INCACHEPURGE)) { rp->r_flags |= R4INCACHEPURGE; cachepurge_set = B_TRUE; } } if (!mtime_changed && !ctime_changed) { mutex_exit(&rp->r_statelock); return; } rp->r_serial = curthread; mutex_exit(&rp->r_statelock); /* * If we're the recov thread, then force async nfs4_purge_caches * to avoid potential deadlock. */ if (mtime_changed) nfs4_purge_caches(vp, NFS4_NOPURGE_DNLC, cr, recov ? 1 : async); if ((rp->r_flags & R4INCACHEPURGE) && cachepurge_set) { mutex_enter(&rp->r_statelock); rp->r_flags &= ~R4INCACHEPURGE; cv_broadcast(&rp->r_cv); mutex_exit(&rp->r_statelock); cachepurge_set = B_FALSE; } if (ctime_changed) { (void) nfs4_access_purge_rp(rp); if (rp->r_secattr != NULL) { mutex_enter(&rp->r_statelock); vsp = rp->r_secattr; rp->r_secattr = NULL; mutex_exit(&rp->r_statelock); if (vsp != NULL) nfs4_acl_free_cache(vsp); } } if (!was_serial) { mutex_enter(&rp->r_statelock); rp->r_serial = NULL; cv_broadcast(&rp->r_cv); mutex_exit(&rp->r_statelock); } } /* * Set attributes cache for given vnode using virtual attributes. * * Set the timeout value on the attribute cache and fill it * with the passed in attributes. * * The caller must be holding r_statelock. */ static void nfs4_attrcache_va(vnode_t *vp, nfs4_ga_res_t *garp, int set_cache_timeout) { rnode4_t *rp; mntinfo4_t *mi; hrtime_t delta; hrtime_t now; vattr_t *vap = &garp->n4g_va; rp = VTOR4(vp); ASSERT(MUTEX_HELD(&rp->r_statelock)); ASSERT(vap->va_mask == AT_ALL); /* Switch to master before checking v_flag */ if (IS_SHADOW(vp, rp)) vp = RTOV4(rp); now = gethrtime(); mi = VTOMI4(vp); /* * Only establish a new cache timeout (if requested). Never * extend a timeout. Never clear a timeout. Clearing a timeout * is done by nfs4_update_dircaches (ancestor in our call chain) */ if (set_cache_timeout && ! rp->r_time_cache_inval) rp->r_time_cache_inval = now + mi->mi_acdirmax; /* * Delta is the number of nanoseconds that we will * cache the attributes of the file. It is based on * the number of nanoseconds since the last time that * we detected a change. The assumption is that files * that changed recently are likely to change again. * There is a minimum and a maximum for regular files * and for directories which is enforced though. * * Using the time since last change was detected * eliminates direct comparison or calculation * using mixed client and server times. NFS does * not make any assumptions regarding the client * and server clocks being synchronized. */ if (vap->va_mtime.tv_sec != rp->r_attr.va_mtime.tv_sec || vap->va_mtime.tv_nsec != rp->r_attr.va_mtime.tv_nsec || vap->va_size != rp->r_attr.va_size) { rp->r_time_attr_saved = now; } if ((mi->mi_flags & MI4_NOAC) || (vp->v_flag & VNOCACHE)) delta = 0; else { delta = now - rp->r_time_attr_saved; if (vp->v_type == VDIR) { if (delta < mi->mi_acdirmin) delta = mi->mi_acdirmin; else if (delta > mi->mi_acdirmax) delta = mi->mi_acdirmax; } else { if (delta < mi->mi_acregmin) delta = mi->mi_acregmin; else if (delta > mi->mi_acregmax) delta = mi->mi_acregmax; } } rp->r_time_attr_inval = now + delta; rp->r_attr = *vap; if (garp->n4g_change_valid) rp->r_change = garp->n4g_change; /* * The attributes that were returned may be valid and can * be used, but they may not be allowed to be cached. * Reset the timers to cause immediate invalidation and * clear r_change so no VERIFY operations will suceed */ if (garp->n4g_attrwhy == NFS4_GETATTR_NOCACHE_OK) { rp->r_time_attr_inval = now; rp->r_time_attr_saved = now; rp->r_change = 0; } /* * If mounted_on_fileid returned AND the object is a stub, * then set object's va_nodeid to the mounted over fid * returned by server. * * If mounted_on_fileid not provided/supported, then * just set it to 0 for now. Eventually it would be * better to set it to a hashed version of FH. This * would probably be good enough to provide a unique * fid/d_ino within a dir. * * We don't need to carry mounted_on_fileid in the * rnode as long as the client never requests fileid * without also requesting mounted_on_fileid. For * now, it stays. */ if (garp->n4g_mon_fid_valid) { rp->r_mntd_fid = garp->n4g_mon_fid; if (RP_ISSTUB(rp)) rp->r_attr.va_nodeid = rp->r_mntd_fid; } /* * Check to see if there are valid pathconf bits to * cache in the rnode. */ if (garp->n4g_ext_res) { if (garp->n4g_ext_res->n4g_pc4.pc4_cache_valid) { rp->r_pathconf = garp->n4g_ext_res->n4g_pc4; } else { if (garp->n4g_ext_res->n4g_pc4.pc4_xattr_valid) { rp->r_pathconf.pc4_xattr_valid = TRUE; rp->r_pathconf.pc4_xattr_exists = garp->n4g_ext_res->n4g_pc4.pc4_xattr_exists; } } } /* * Update the size of the file if there is no cached data or if * the cached data is clean and there is no data being written * out. */ if (rp->r_size != vap->va_size && (!vn_has_cached_data(vp) || (!(rp->r_flags & R4DIRTY) && rp->r_count == 0))) { rp->r_size = vap->va_size; } nfs_setswaplike(vp, vap); rp->r_flags &= ~R4WRITEMODIFIED; } /* * Get attributes over-the-wire and update attributes cache * if no error occurred in the over-the-wire operation. * Return 0 if successful, otherwise error. */ int nfs4_getattr_otw(vnode_t *vp, nfs4_ga_res_t *garp, cred_t *cr, int get_acl) { mntinfo4_t *mi = VTOMI4(vp); hrtime_t t; nfs4_recov_state_t recov_state; nfs4_error_t e = { 0, NFS4_OK, RPC_SUCCESS }; recov_state.rs_flags = 0; recov_state.rs_num_retry_despite_err = 0; /* Save the original mount point security flavor */ (void) save_mnt_secinfo(mi->mi_curr_serv); recov_retry: if ((e.error = nfs4_start_fop(mi, vp, NULL, OH_GETATTR, &recov_state, NULL))) { (void) check_mnt_secinfo(mi->mi_curr_serv, vp); return (e.error); } t = gethrtime(); nfs4_getattr_otw_norecovery(vp, garp, &e, cr, get_acl); if (nfs4_needs_recovery(&e, FALSE, vp->v_vfsp)) { if (nfs4_start_recovery(&e, VTOMI4(vp), vp, NULL, NULL, NULL, OP_GETATTR, NULL, NULL, NULL) == FALSE) { nfs4_end_fop(VTOMI4(vp), vp, NULL, OH_GETATTR, &recov_state, 1); goto recov_retry; } } nfs4_end_fop(VTOMI4(vp), vp, NULL, OH_GETATTR, &recov_state, 0); if (!e.error) { if (e.stat == NFS4_OK) { nfs4_attr_cache(vp, garp, t, cr, FALSE, NULL); } else { e.error = geterrno4(e.stat); nfs4_purge_stale_fh(e.error, vp, cr); } } /* * If getattr a node that is a stub for a crossed * mount point, keep the original secinfo flavor for * the current file system, not the crossed one. */ (void) check_mnt_secinfo(mi->mi_curr_serv, vp); return (e.error); } /* * Generate a compound to get attributes over-the-wire. */ void nfs4_getattr_otw_norecovery(vnode_t *vp, nfs4_ga_res_t *garp, nfs4_error_t *ep, cred_t *cr, int get_acl) { COMPOUND4args_clnt args; COMPOUND4res_clnt res; int doqueue; rnode4_t *rp = VTOR4(vp); nfs_argop4 argop[2]; args.ctag = TAG_GETATTR; args.array_len = 2; args.array = argop; /* putfh */ argop[0].argop = OP_CPUTFH; argop[0].nfs_argop4_u.opcputfh.sfh = rp->r_fh; /* getattr */ /* * Unlike nfs version 2 and 3, where getattr returns all the * attributes, nfs version 4 returns only the ones explicitly * asked for. This creates problems, as some system functions * (e.g. cache check) require certain attributes and if the * cached node lacks some attributes such as uid/gid, it can * affect system utilities (e.g. "ls") that rely on the information * to be there. This can lead to anything from system crashes to * corrupted information processed by user apps. * So to ensure that all bases are covered, request at least * the AT_ALL attribute mask. */ argop[1].argop = OP_GETATTR; argop[1].nfs_argop4_u.opgetattr.attr_request = NFS4_VATTR_MASK; if (get_acl) argop[1].nfs_argop4_u.opgetattr.attr_request |= FATTR4_ACL_MASK; argop[1].nfs_argop4_u.opgetattr.mi = VTOMI4(vp); doqueue = 1; rfs4call(VTOMI4(vp), &args, &res, cr, &doqueue, 0, ep); if (ep->error) return; if (res.status != NFS4_OK) { (void) xdr_free(xdr_COMPOUND4res_clnt, (caddr_t)&res); return; } *garp = res.array[1].nfs_resop4_u.opgetattr.ga_res; (void) xdr_free(xdr_COMPOUND4res_clnt, (caddr_t)&res); } /* * Return either cached or remote attributes. If get remote attr * use them to check and invalidate caches, then cache the new attributes. */ int nfs4getattr(vnode_t *vp, vattr_t *vap, cred_t *cr) { int error; rnode4_t *rp; nfs4_ga_res_t gar; ASSERT(nfs4_consistent_type(vp)); /* * If we've got cached attributes, we're done, otherwise go * to the server to get attributes, which will update the cache * in the process. Either way, use the cached attributes for * the caller's vattr_t. * * Note that we ignore the gar set by the OTW call: the attr caching * code may make adjustments when storing to the rnode, and we want * to see those changes here. */ rp = VTOR4(vp); error = 0; mutex_enter(&rp->r_statelock); if (!ATTRCACHE4_VALID(vp)) { mutex_exit(&rp->r_statelock); error = nfs4_getattr_otw(vp, &gar, cr, 0); mutex_enter(&rp->r_statelock); } if (!error) *vap = rp->r_attr; /* Return the client's view of file size */ vap->va_size = rp->r_size; mutex_exit(&rp->r_statelock); ASSERT(nfs4_consistent_type(vp)); return (error); } int nfs4_attr_otw(vnode_t *vp, nfs4_tag_type_t tag_type, nfs4_ga_res_t *garp, bitmap4 reqbitmap, cred_t *cr) { COMPOUND4args_clnt args; COMPOUND4res_clnt res; int doqueue; nfs_argop4 argop[2]; mntinfo4_t *mi = VTOMI4(vp); bool_t needrecov = FALSE; nfs4_recov_state_t recov_state; nfs4_error_t e = { 0, NFS4_OK, RPC_SUCCESS }; nfs4_ga_ext_res_t *gerp; recov_state.rs_flags = 0; recov_state.rs_num_retry_despite_err = 0; recov_retry: args.ctag = tag_type; args.array_len = 2; args.array = argop; e.error = nfs4_start_fop(mi, vp, NULL, OH_GETATTR, &recov_state, NULL); if (e.error) return (e.error); /* putfh */ argop[0].argop = OP_CPUTFH; argop[0].nfs_argop4_u.opcputfh.sfh = VTOR4(vp)->r_fh; /* getattr */ argop[1].argop = OP_GETATTR; argop[1].nfs_argop4_u.opgetattr.attr_request = reqbitmap; argop[1].nfs_argop4_u.opgetattr.mi = mi; doqueue = 1; NFS4_DEBUG(nfs4_client_call_debug, (CE_NOTE, "nfs4_attr_otw: %s call, rp %s", needrecov ? "recov" : "first", rnode4info(VTOR4(vp)))); rfs4call(mi, &args, &res, cr, &doqueue, 0, &e); needrecov = nfs4_needs_recovery(&e, FALSE, vp->v_vfsp); if (!needrecov && e.error) { nfs4_end_fop(VTOMI4(vp), vp, NULL, OH_GETATTR, &recov_state, needrecov); return (e.error); } if (needrecov) { bool_t abort; NFS4_DEBUG(nfs4_client_recov_debug, (CE_NOTE, "nfs4_attr_otw: initiating recovery\n")); abort = nfs4_start_recovery(&e, VTOMI4(vp), vp, NULL, NULL, NULL, OP_GETATTR, NULL, NULL, NULL); nfs4_end_fop(VTOMI4(vp), vp, NULL, OH_GETATTR, &recov_state, needrecov); if (!e.error) { (void) xdr_free(xdr_COMPOUND4res_clnt, (caddr_t)&res); e.error = geterrno4(res.status); } if (abort == FALSE) goto recov_retry; return (e.error); } if (res.status) { e.error = geterrno4(res.status); } else { gerp = garp->n4g_ext_res; bcopy(&res.array[1].nfs_resop4_u.opgetattr.ga_res, garp, sizeof (nfs4_ga_res_t)); garp->n4g_ext_res = gerp; if (garp->n4g_ext_res && res.array[1].nfs_resop4_u.opgetattr.ga_res.n4g_ext_res) bcopy(res.array[1].nfs_resop4_u.opgetattr. ga_res.n4g_ext_res, garp->n4g_ext_res, sizeof (nfs4_ga_ext_res_t)); } (void) xdr_free(xdr_COMPOUND4res_clnt, (caddr_t)&res); nfs4_end_fop(VTOMI4(vp), vp, NULL, OH_GETATTR, &recov_state, needrecov); return (e.error); } /* * Asynchronous I/O parameters. nfs_async_threads is the high-water mark * for the demand-based allocation of async threads per-mount. The * nfs_async_timeout is the amount of time a thread will live after it * becomes idle, unless new I/O requests are received before the thread * dies. See nfs4_async_putpage and nfs4_async_start. */ static void nfs4_async_start(struct vfs *); static void nfs4_async_pgops_start(struct vfs *); static void nfs4_async_common_start(struct vfs *, int); static void free_async_args4(struct nfs4_async_reqs *args) { rnode4_t *rp; if (args->a_io != NFS4_INACTIVE) { rp = VTOR4(args->a_vp); mutex_enter(&rp->r_statelock); rp->r_count--; if (args->a_io == NFS4_PUTAPAGE || args->a_io == NFS4_PAGEIO) rp->r_awcount--; cv_broadcast(&rp->r_cv); mutex_exit(&rp->r_statelock); VN_RELE(args->a_vp); } crfree(args->a_cred); kmem_free(args, sizeof (*args)); } /* * Cross-zone thread creation and NFS access is disallowed, yet fsflush() and * pageout(), running in the global zone, have legitimate reasons to do * VOP_PUTPAGE(B_ASYNC) on other zones' NFS mounts. We avoid the problem by * use of a a per-mount "asynchronous requests manager thread" which is * signaled by the various asynchronous work routines when there is * asynchronous work to be done. It is responsible for creating new * worker threads if necessary, and notifying existing worker threads * that there is work to be done. * * In other words, it will "take the specifications from the customers and * give them to the engineers." * * Worker threads die off of their own accord if they are no longer * needed. * * This thread is killed when the zone is going away or the filesystem * is being unmounted. */ void nfs4_async_manager(vfs_t *vfsp) { callb_cpr_t cprinfo; mntinfo4_t *mi; uint_t max_threads; mi = VFTOMI4(vfsp); CALLB_CPR_INIT(&cprinfo, &mi->mi_async_lock, callb_generic_cpr, "nfs4_async_manager"); mutex_enter(&mi->mi_async_lock); /* * We want to stash the max number of threads that this mount was * allowed so we can use it later when the variable is set to zero as * part of the zone/mount going away. * * We want to be able to create at least one thread to handle * asynchronous inactive calls. */ max_threads = MAX(mi->mi_max_threads, 1); /* * We don't want to wait for mi_max_threads to go to zero, since that * happens as part of a failed unmount, but this thread should only * exit when the mount is really going away. * * Once MI4_ASYNC_MGR_STOP is set, no more async operations will be * attempted: the various _async_*() functions know to do things * inline if mi_max_threads == 0. Henceforth we just drain out the * outstanding requests. * * Note that we still create zthreads even if we notice the zone is * shutting down (MI4_ASYNC_MGR_STOP is set); this may cause the zone * shutdown sequence to take slightly longer in some cases, but * doesn't violate the protocol, as all threads will exit as soon as * they're done processing the remaining requests. */ for (;;) { while (mi->mi_async_req_count > 0) { /* * Paranoia: If the mount started out having * (mi->mi_max_threads == 0), and the value was * later changed (via a debugger or somesuch), * we could be confused since we will think we * can't create any threads, and the calling * code (which looks at the current value of * mi->mi_max_threads, now non-zero) thinks we * can. * * So, because we're paranoid, we create threads * up to the maximum of the original and the * current value. This means that future * (debugger-induced) alterations of * mi->mi_max_threads are ignored for our * purposes, but who told them they could change * random values on a live kernel anyhow? */ if (mi->mi_threads[NFS4_ASYNC_QUEUE] < MAX(mi->mi_max_threads, max_threads)) { mi->mi_threads[NFS4_ASYNC_QUEUE]++; mutex_exit(&mi->mi_async_lock); MI4_HOLD(mi); VFS_HOLD(vfsp); /* hold for new thread */ (void) zthread_create(NULL, 0, nfs4_async_start, vfsp, 0, minclsyspri); mutex_enter(&mi->mi_async_lock); } else if (mi->mi_threads[NFS4_ASYNC_PGOPS_QUEUE] < NUM_ASYNC_PGOPS_THREADS) { mi->mi_threads[NFS4_ASYNC_PGOPS_QUEUE]++; mutex_exit(&mi->mi_async_lock); MI4_HOLD(mi); VFS_HOLD(vfsp); /* hold for new thread */ (void) zthread_create(NULL, 0, nfs4_async_pgops_start, vfsp, 0, minclsyspri); mutex_enter(&mi->mi_async_lock); } NFS4_WAKE_ASYNC_WORKER(mi->mi_async_work_cv); ASSERT(mi->mi_async_req_count != 0); mi->mi_async_req_count--; } mutex_enter(&mi->mi_lock); if (mi->mi_flags & MI4_ASYNC_MGR_STOP) { mutex_exit(&mi->mi_lock); break; } mutex_exit(&mi->mi_lock); CALLB_CPR_SAFE_BEGIN(&cprinfo); cv_wait(&mi->mi_async_reqs_cv, &mi->mi_async_lock); CALLB_CPR_SAFE_END(&cprinfo, &mi->mi_async_lock); } NFS4_DEBUG(nfs4_client_zone_debug, (CE_NOTE, "nfs4_async_manager exiting for vfs %p\n", (void *)mi->mi_vfsp)); /* * Let everyone know we're done. */ mi->mi_manager_thread = NULL; /* * Wake up the inactive thread. */ cv_broadcast(&mi->mi_inact_req_cv); /* * Wake up anyone sitting in nfs4_async_manager_stop() */ cv_broadcast(&mi->mi_async_cv); /* * There is no explicit call to mutex_exit(&mi->mi_async_lock) * since CALLB_CPR_EXIT is actually responsible for releasing * 'mi_async_lock'. */ CALLB_CPR_EXIT(&cprinfo); VFS_RELE(vfsp); /* release thread's hold */ MI4_RELE(mi); zthread_exit(); } /* * Signal (and wait for) the async manager thread to clean up and go away. */ void nfs4_async_manager_stop(vfs_t *vfsp) { mntinfo4_t *mi = VFTOMI4(vfsp); mutex_enter(&mi->mi_async_lock); mutex_enter(&mi->mi_lock); mi->mi_flags |= MI4_ASYNC_MGR_STOP; mutex_exit(&mi->mi_lock); cv_broadcast(&mi->mi_async_reqs_cv); /* * Wait for the async manager thread to die. */ while (mi->mi_manager_thread != NULL) cv_wait(&mi->mi_async_cv, &mi->mi_async_lock); mutex_exit(&mi->mi_async_lock); } int nfs4_async_readahead(vnode_t *vp, u_offset_t blkoff, caddr_t addr, struct seg *seg, cred_t *cr, void (*readahead)(vnode_t *, u_offset_t, caddr_t, struct seg *, cred_t *)) { rnode4_t *rp; mntinfo4_t *mi; struct nfs4_async_reqs *args; rp = VTOR4(vp); ASSERT(rp->r_freef == NULL); mi = VTOMI4(vp); /* * If addr falls in a different segment, don't bother doing readahead. */ if (addr >= seg->s_base + seg->s_size) return (-1); /* * If we can't allocate a request structure, punt on the readahead. */ if ((args = kmem_alloc(sizeof (*args), KM_NOSLEEP)) == NULL) return (-1); /* * If a lock operation is pending, don't initiate any new * readaheads. Otherwise, bump r_count to indicate the new * asynchronous I/O. */ if (!nfs_rw_tryenter(&rp->r_lkserlock, RW_READER)) { kmem_free(args, sizeof (*args)); return (-1); } mutex_enter(&rp->r_statelock); rp->r_count++; mutex_exit(&rp->r_statelock); nfs_rw_exit(&rp->r_lkserlock); args->a_next = NULL; #ifdef DEBUG args->a_queuer = curthread; #endif VN_HOLD(vp); args->a_vp = vp; ASSERT(cr != NULL); crhold(cr); args->a_cred = cr; args->a_io = NFS4_READ_AHEAD; args->a_nfs4_readahead = readahead; args->a_nfs4_blkoff = blkoff; args->a_nfs4_seg = seg; args->a_nfs4_addr = addr; mutex_enter(&mi->mi_async_lock); /* * If asyncio has been disabled, don't bother readahead. */ if (mi->mi_max_threads == 0) { mutex_exit(&mi->mi_async_lock); goto noasync; } /* * Link request structure into the async list and * wakeup async thread to do the i/o. */ if (mi->mi_async_reqs[NFS4_READ_AHEAD] == NULL) { mi->mi_async_reqs[NFS4_READ_AHEAD] = args; mi->mi_async_tail[NFS4_READ_AHEAD] = args; } else { mi->mi_async_tail[NFS4_READ_AHEAD]->a_next = args; mi->mi_async_tail[NFS4_READ_AHEAD] = args; } if (mi->mi_io_kstats) { mutex_enter(&mi->mi_lock); kstat_waitq_enter(KSTAT_IO_PTR(mi->mi_io_kstats)); mutex_exit(&mi->mi_lock); } mi->mi_async_req_count++; ASSERT(mi->mi_async_req_count != 0); cv_signal(&mi->mi_async_reqs_cv); mutex_exit(&mi->mi_async_lock); return (0); noasync: mutex_enter(&rp->r_statelock); rp->r_count--; cv_broadcast(&rp->r_cv); mutex_exit(&rp->r_statelock); VN_RELE(vp); crfree(cr); kmem_free(args, sizeof (*args)); return (-1); } static void nfs4_async_start(struct vfs *vfsp) { nfs4_async_common_start(vfsp, NFS4_ASYNC_QUEUE); } static void nfs4_async_pgops_start(struct vfs *vfsp) { nfs4_async_common_start(vfsp, NFS4_ASYNC_PGOPS_QUEUE); } /* * The async queues for each mounted file system are arranged as a * set of queues, one for each async i/o type. Requests are taken * from the queues in a round-robin fashion. A number of consecutive * requests are taken from each queue before moving on to the next * queue. This functionality may allow the NFS Version 2 server to do * write clustering, even if the client is mixing writes and reads * because it will take multiple write requests from the queue * before processing any of the other async i/o types. * * XXX The nfs4_async_common_start thread is unsafe in the light of the present * model defined by cpr to suspend the system. Specifically over the * wire calls are cpr-unsafe. The thread should be reevaluated in * case of future updates to the cpr model. */ static void nfs4_async_common_start(struct vfs *vfsp, int async_queue) { struct nfs4_async_reqs *args; mntinfo4_t *mi = VFTOMI4(vfsp); clock_t time_left = 1; callb_cpr_t cprinfo; int i; extern int nfs_async_timeout; int async_types; kcondvar_t *async_work_cv; if (async_queue == NFS4_ASYNC_QUEUE) { async_types = NFS4_ASYNC_TYPES; async_work_cv = &mi->mi_async_work_cv[NFS4_ASYNC_QUEUE]; } else { async_types = NFS4_ASYNC_PGOPS_TYPES; async_work_cv = &mi->mi_async_work_cv[NFS4_ASYNC_PGOPS_QUEUE]; } /* * Dynamic initialization of nfs_async_timeout to allow nfs to be * built in an implementation independent manner. */ if (nfs_async_timeout == -1) nfs_async_timeout = NFS_ASYNC_TIMEOUT; CALLB_CPR_INIT(&cprinfo, &mi->mi_async_lock, callb_generic_cpr, "nas"); mutex_enter(&mi->mi_async_lock); for (;;) { /* * Find the next queue containing an entry. We start * at the current queue pointer and then round robin * through all of them until we either find a non-empty * queue or have looked through all of them. */ for (i = 0; i < async_types; i++) { args = *mi->mi_async_curr[async_queue]; if (args != NULL) break; mi->mi_async_curr[async_queue]++; if (mi->mi_async_curr[async_queue] == &mi->mi_async_reqs[async_types]) { mi->mi_async_curr[async_queue] = &mi->mi_async_reqs[0]; } } /* * If we didn't find a entry, then block until woken up * again and then look through the queues again. */ if (args == NULL) { /* * Exiting is considered to be safe for CPR as well */ CALLB_CPR_SAFE_BEGIN(&cprinfo); /* * Wakeup thread waiting to unmount the file * system only if all async threads are inactive. * * If we've timed-out and there's nothing to do, * then get rid of this thread. */ if (mi->mi_max_threads == 0 || time_left <= 0) { --mi->mi_threads[async_queue]; if (mi->mi_threads[NFS4_ASYNC_QUEUE] == 0 && mi->mi_threads[NFS4_ASYNC_PGOPS_QUEUE] == 0) cv_signal(&mi->mi_async_cv); CALLB_CPR_EXIT(&cprinfo); VFS_RELE(vfsp); /* release thread's hold */ MI4_RELE(mi); zthread_exit(); /* NOTREACHED */ } time_left = cv_reltimedwait(async_work_cv, &mi->mi_async_lock, nfs_async_timeout, TR_CLOCK_TICK); CALLB_CPR_SAFE_END(&cprinfo, &mi->mi_async_lock); continue; } else { time_left = 1; } /* * Remove the request from the async queue and then * update the current async request queue pointer. If * the current queue is empty or we have removed enough * consecutive entries from it, then reset the counter * for this queue and then move the current pointer to * the next queue. */ *mi->mi_async_curr[async_queue] = args->a_next; if (*mi->mi_async_curr[async_queue] == NULL || --mi->mi_async_clusters[args->a_io] == 0) { mi->mi_async_clusters[args->a_io] = mi->mi_async_init_clusters; mi->mi_async_curr[async_queue]++; if (mi->mi_async_curr[async_queue] == &mi->mi_async_reqs[async_types]) { mi->mi_async_curr[async_queue] = &mi->mi_async_reqs[0]; } } if (args->a_io != NFS4_INACTIVE && mi->mi_io_kstats) { mutex_enter(&mi->mi_lock); kstat_waitq_exit(KSTAT_IO_PTR(mi->mi_io_kstats)); mutex_exit(&mi->mi_lock); } mutex_exit(&mi->mi_async_lock); /* * Obtain arguments from the async request structure. */ if (args->a_io == NFS4_READ_AHEAD && mi->mi_max_threads > 0) { (*args->a_nfs4_readahead)(args->a_vp, args->a_nfs4_blkoff, args->a_nfs4_addr, args->a_nfs4_seg, args->a_cred); } else if (args->a_io == NFS4_PUTAPAGE) { (void) (*args->a_nfs4_putapage)(args->a_vp, args->a_nfs4_pp, args->a_nfs4_off, args->a_nfs4_len, args->a_nfs4_flags, args->a_cred); } else if (args->a_io == NFS4_PAGEIO) { (void) (*args->a_nfs4_pageio)(args->a_vp, args->a_nfs4_pp, args->a_nfs4_off, args->a_nfs4_len, args->a_nfs4_flags, args->a_cred); } else if (args->a_io == NFS4_READDIR) { (void) ((*args->a_nfs4_readdir)(args->a_vp, args->a_nfs4_rdc, args->a_cred)); } else if (args->a_io == NFS4_COMMIT) { (*args->a_nfs4_commit)(args->a_vp, args->a_nfs4_plist, args->a_nfs4_offset, args->a_nfs4_count, args->a_cred); } else if (args->a_io == NFS4_INACTIVE) { nfs4_inactive_otw(args->a_vp, args->a_cred); } /* * Now, release the vnode and free the credentials * structure. */ free_async_args4(args); /* * Reacquire the mutex because it will be needed above. */ mutex_enter(&mi->mi_async_lock); } } /* * nfs4_inactive_thread - look for vnodes that need over-the-wire calls as * part of VOP_INACTIVE. */ void nfs4_inactive_thread(mntinfo4_t *mi) { struct nfs4_async_reqs *args; callb_cpr_t cprinfo; vfs_t *vfsp = mi->mi_vfsp; CALLB_CPR_INIT(&cprinfo, &mi->mi_async_lock, callb_generic_cpr, "nfs4_inactive_thread"); for (;;) { mutex_enter(&mi->mi_async_lock); args = mi->mi_async_reqs[NFS4_INACTIVE]; if (args == NULL) { mutex_enter(&mi->mi_lock); /* * We don't want to exit until the async manager is done * with its work; hence the check for mi_manager_thread * being NULL. * * The async manager thread will cv_broadcast() on * mi_inact_req_cv when it's done, at which point we'll * wake up and exit. */ if (mi->mi_manager_thread == NULL) goto die; mi->mi_flags |= MI4_INACTIVE_IDLE; mutex_exit(&mi->mi_lock); cv_signal(&mi->mi_async_cv); CALLB_CPR_SAFE_BEGIN(&cprinfo); cv_wait(&mi->mi_inact_req_cv, &mi->mi_async_lock); CALLB_CPR_SAFE_END(&cprinfo, &mi->mi_async_lock); mutex_exit(&mi->mi_async_lock); } else { mutex_enter(&mi->mi_lock); mi->mi_flags &= ~MI4_INACTIVE_IDLE; mutex_exit(&mi->mi_lock); mi->mi_async_reqs[NFS4_INACTIVE] = args->a_next; mutex_exit(&mi->mi_async_lock); nfs4_inactive_otw(args->a_vp, args->a_cred); crfree(args->a_cred); kmem_free(args, sizeof (*args)); } } die: mutex_exit(&mi->mi_lock); mi->mi_inactive_thread = NULL; cv_signal(&mi->mi_async_cv); /* * There is no explicit call to mutex_exit(&mi->mi_async_lock) since * CALLB_CPR_EXIT is actually responsible for releasing 'mi_async_lock'. */ CALLB_CPR_EXIT(&cprinfo); NFS4_DEBUG(nfs4_client_zone_debug, (CE_NOTE, "nfs4_inactive_thread exiting for vfs %p\n", (void *)vfsp)); MI4_RELE(mi); zthread_exit(); /* NOTREACHED */ } /* * nfs_async_stop: * Wait for all outstanding putpage operations and the inactive thread to * complete; nfs4_async_stop_sig() without interruptibility. */ void nfs4_async_stop(struct vfs *vfsp) { mntinfo4_t *mi = VFTOMI4(vfsp); /* * Wait for all outstanding async operations to complete and for * worker threads to exit. */ mutex_enter(&mi->mi_async_lock); mi->mi_max_threads = 0; NFS4_WAKEALL_ASYNC_WORKERS(mi->mi_async_work_cv); while (mi->mi_threads[NFS4_ASYNC_QUEUE] != 0 || mi->mi_threads[NFS4_ASYNC_PGOPS_QUEUE] != 0) cv_wait(&mi->mi_async_cv, &mi->mi_async_lock); /* * Wait for the inactive thread to finish doing what it's doing. It * won't exit until the last reference to the vfs_t goes away. */ if (mi->mi_inactive_thread != NULL) { mutex_enter(&mi->mi_lock); while (!(mi->mi_flags & MI4_INACTIVE_IDLE) || (mi->mi_async_reqs[NFS4_INACTIVE] != NULL)) { mutex_exit(&mi->mi_lock); cv_wait(&mi->mi_async_cv, &mi->mi_async_lock); mutex_enter(&mi->mi_lock); } mutex_exit(&mi->mi_lock); } mutex_exit(&mi->mi_async_lock); } /* * nfs_async_stop_sig: * Wait for all outstanding putpage operations and the inactive thread to * complete. If a signal is delivered we will abort and return non-zero; * otherwise return 0. Since this routine is called from nfs4_unmount, we * need to make it interruptible. */ int nfs4_async_stop_sig(struct vfs *vfsp) { mntinfo4_t *mi = VFTOMI4(vfsp); ushort_t omax; bool_t intr = FALSE; /* * Wait for all outstanding putpage operations to complete and for * worker threads to exit. */ mutex_enter(&mi->mi_async_lock); omax = mi->mi_max_threads; mi->mi_max_threads = 0; NFS4_WAKEALL_ASYNC_WORKERS(mi->mi_async_work_cv); while (mi->mi_threads[NFS4_ASYNC_QUEUE] != 0 || mi->mi_threads[NFS4_ASYNC_PGOPS_QUEUE] != 0) { if (!cv_wait_sig(&mi->mi_async_cv, &mi->mi_async_lock)) { intr = TRUE; goto interrupted; } } /* * Wait for the inactive thread to finish doing what it's doing. It * won't exit until the a last reference to the vfs_t goes away. */ if (mi->mi_inactive_thread != NULL) { mutex_enter(&mi->mi_lock); while (!(mi->mi_flags & MI4_INACTIVE_IDLE) || (mi->mi_async_reqs[NFS4_INACTIVE] != NULL)) { mutex_exit(&mi->mi_lock); if (!cv_wait_sig(&mi->mi_async_cv, &mi->mi_async_lock)) { intr = TRUE; goto interrupted; } mutex_enter(&mi->mi_lock); } mutex_exit(&mi->mi_lock); } interrupted: if (intr) mi->mi_max_threads = omax; mutex_exit(&mi->mi_async_lock); return (intr); } int nfs4_async_putapage(vnode_t *vp, page_t *pp, u_offset_t off, size_t len, int flags, cred_t *cr, int (*putapage)(vnode_t *, page_t *, u_offset_t, size_t, int, cred_t *)) { rnode4_t *rp; mntinfo4_t *mi; struct nfs4_async_reqs *args; ASSERT(flags & B_ASYNC); ASSERT(vp->v_vfsp != NULL); rp = VTOR4(vp); ASSERT(rp->r_count > 0); mi = VTOMI4(vp); /* * If we can't allocate a request structure, do the putpage * operation synchronously in this thread's context. */ if ((args = kmem_alloc(sizeof (*args), KM_NOSLEEP)) == NULL) goto noasync; args->a_next = NULL; #ifdef DEBUG args->a_queuer = curthread; #endif VN_HOLD(vp); args->a_vp = vp; ASSERT(cr != NULL); crhold(cr); args->a_cred = cr; args->a_io = NFS4_PUTAPAGE; args->a_nfs4_putapage = putapage; args->a_nfs4_pp = pp; args->a_nfs4_off = off; args->a_nfs4_len = (uint_t)len; args->a_nfs4_flags = flags; mutex_enter(&mi->mi_async_lock); /* * If asyncio has been disabled, then make a synchronous request. * This check is done a second time in case async io was diabled * while this thread was blocked waiting for memory pressure to * reduce or for the queue to drain. */ if (mi->mi_max_threads == 0) { mutex_exit(&mi->mi_async_lock); VN_RELE(vp); crfree(cr); kmem_free(args, sizeof (*args)); goto noasync; } /* * Link request structure into the async list and * wakeup async thread to do the i/o. */ if (mi->mi_async_reqs[NFS4_PUTAPAGE] == NULL) { mi->mi_async_reqs[NFS4_PUTAPAGE] = args; mi->mi_async_tail[NFS4_PUTAPAGE] = args; } else { mi->mi_async_tail[NFS4_PUTAPAGE]->a_next = args; mi->mi_async_tail[NFS4_PUTAPAGE] = args; } mutex_enter(&rp->r_statelock); rp->r_count++; rp->r_awcount++; mutex_exit(&rp->r_statelock); if (mi->mi_io_kstats) { mutex_enter(&mi->mi_lock); kstat_waitq_enter(KSTAT_IO_PTR(mi->mi_io_kstats)); mutex_exit(&mi->mi_lock); } mi->mi_async_req_count++; ASSERT(mi->mi_async_req_count != 0); cv_signal(&mi->mi_async_reqs_cv); mutex_exit(&mi->mi_async_lock); return (0); noasync: if (curproc == proc_pageout || curproc == proc_fsflush) { /* * If we get here in the context of the pageout/fsflush, * or we have run out of memory or we're attempting to * unmount we refuse to do a sync write, because this may * hang pageout/fsflush and the machine. In this case, * we just re-mark the page as dirty and punt on the page. * * Make sure B_FORCE isn't set. We can re-mark the * pages as dirty and unlock the pages in one swoop by * passing in B_ERROR to pvn_write_done(). However, * we should make sure B_FORCE isn't set - we don't * want the page tossed before it gets written out. */ if (flags & B_FORCE) flags &= ~(B_INVAL | B_FORCE); pvn_write_done(pp, flags | B_ERROR); return (0); } if (nfs_zone() != mi->mi_zone) { /* * So this was a cross-zone sync putpage. * * We pass in B_ERROR to pvn_write_done() to re-mark the pages * as dirty and unlock them. * * We don't want to clear B_FORCE here as the caller presumably * knows what they're doing if they set it. */ pvn_write_done(pp, flags | B_ERROR); return (EPERM); } return ((*putapage)(vp, pp, off, len, flags, cr)); } int nfs4_async_pageio(vnode_t *vp, page_t *pp, u_offset_t io_off, size_t io_len, int flags, cred_t *cr, int (*pageio)(vnode_t *, page_t *, u_offset_t, size_t, int, cred_t *)) { rnode4_t *rp; mntinfo4_t *mi; struct nfs4_async_reqs *args; ASSERT(flags & B_ASYNC); ASSERT(vp->v_vfsp != NULL); rp = VTOR4(vp); ASSERT(rp->r_count > 0); mi = VTOMI4(vp); /* * If we can't allocate a request structure, do the pageio * request synchronously in this thread's context. */ if ((args = kmem_alloc(sizeof (*args), KM_NOSLEEP)) == NULL) goto noasync; args->a_next = NULL; #ifdef DEBUG args->a_queuer = curthread; #endif VN_HOLD(vp); args->a_vp = vp; ASSERT(cr != NULL); crhold(cr); args->a_cred = cr; args->a_io = NFS4_PAGEIO; args->a_nfs4_pageio = pageio; args->a_nfs4_pp = pp; args->a_nfs4_off = io_off; args->a_nfs4_len = (uint_t)io_len; args->a_nfs4_flags = flags; mutex_enter(&mi->mi_async_lock); /* * If asyncio has been disabled, then make a synchronous request. * This check is done a second time in case async io was diabled * while this thread was blocked waiting for memory pressure to * reduce or for the queue to drain. */ if (mi->mi_max_threads == 0) { mutex_exit(&mi->mi_async_lock); VN_RELE(vp); crfree(cr); kmem_free(args, sizeof (*args)); goto noasync; } /* * Link request structure into the async list and * wakeup async thread to do the i/o. */ if (mi->mi_async_reqs[NFS4_PAGEIO] == NULL) { mi->mi_async_reqs[NFS4_PAGEIO] = args; mi->mi_async_tail[NFS4_PAGEIO] = args; } else { mi->mi_async_tail[NFS4_PAGEIO]->a_next = args; mi->mi_async_tail[NFS4_PAGEIO] = args; } mutex_enter(&rp->r_statelock); rp->r_count++; rp->r_awcount++; mutex_exit(&rp->r_statelock); if (mi->mi_io_kstats) { mutex_enter(&mi->mi_lock); kstat_waitq_enter(KSTAT_IO_PTR(mi->mi_io_kstats)); mutex_exit(&mi->mi_lock); } mi->mi_async_req_count++; ASSERT(mi->mi_async_req_count != 0); cv_signal(&mi->mi_async_reqs_cv); mutex_exit(&mi->mi_async_lock); return (0); noasync: /* * If we can't do it ASYNC, for reads we do nothing (but cleanup * the page list), for writes we do it synchronously, except for * proc_pageout/proc_fsflush as described below. */ if (flags & B_READ) { pvn_read_done(pp, flags | B_ERROR); return (0); } if (curproc == proc_pageout || curproc == proc_fsflush) { /* * If we get here in the context of the pageout/fsflush, * we refuse to do a sync write, because this may hang * pageout/fsflush (and the machine). In this case, we just * re-mark the page as dirty and punt on the page. * * Make sure B_FORCE isn't set. We can re-mark the * pages as dirty and unlock the pages in one swoop by * passing in B_ERROR to pvn_write_done(). However, * we should make sure B_FORCE isn't set - we don't * want the page tossed before it gets written out. */ if (flags & B_FORCE) flags &= ~(B_INVAL | B_FORCE); pvn_write_done(pp, flags | B_ERROR); return (0); } if (nfs_zone() != mi->mi_zone) { /* * So this was a cross-zone sync pageio. We pass in B_ERROR * to pvn_write_done() to re-mark the pages as dirty and unlock * them. * * We don't want to clear B_FORCE here as the caller presumably * knows what they're doing if they set it. */ pvn_write_done(pp, flags | B_ERROR); return (EPERM); } return ((*pageio)(vp, pp, io_off, io_len, flags, cr)); } void nfs4_async_readdir(vnode_t *vp, rddir4_cache *rdc, cred_t *cr, int (*readdir)(vnode_t *, rddir4_cache *, cred_t *)) { rnode4_t *rp; mntinfo4_t *mi; struct nfs4_async_reqs *args; rp = VTOR4(vp); ASSERT(rp->r_freef == NULL); mi = VTOMI4(vp); /* * If we can't allocate a request structure, skip the readdir. */ if ((args = kmem_alloc(sizeof (*args), KM_NOSLEEP)) == NULL) goto noasync; args->a_next = NULL; #ifdef DEBUG args->a_queuer = curthread; #endif VN_HOLD(vp); args->a_vp = vp; ASSERT(cr != NULL); crhold(cr); args->a_cred = cr; args->a_io = NFS4_READDIR; args->a_nfs4_readdir = readdir; args->a_nfs4_rdc = rdc; mutex_enter(&mi->mi_async_lock); /* * If asyncio has been disabled, then skip this request */ if (mi->mi_max_threads == 0) { mutex_exit(&mi->mi_async_lock); VN_RELE(vp); crfree(cr); kmem_free(args, sizeof (*args)); goto noasync; } /* * Link request structure into the async list and * wakeup async thread to do the i/o. */ if (mi->mi_async_reqs[NFS4_READDIR] == NULL) { mi->mi_async_reqs[NFS4_READDIR] = args; mi->mi_async_tail[NFS4_READDIR] = args; } else { mi->mi_async_tail[NFS4_READDIR]->a_next = args; mi->mi_async_tail[NFS4_READDIR] = args; } mutex_enter(&rp->r_statelock); rp->r_count++; mutex_exit(&rp->r_statelock); if (mi->mi_io_kstats) { mutex_enter(&mi->mi_lock); kstat_waitq_enter(KSTAT_IO_PTR(mi->mi_io_kstats)); mutex_exit(&mi->mi_lock); } mi->mi_async_req_count++; ASSERT(mi->mi_async_req_count != 0); cv_signal(&mi->mi_async_reqs_cv); mutex_exit(&mi->mi_async_lock); return; noasync: mutex_enter(&rp->r_statelock); rdc->entries = NULL; /* * Indicate that no one is trying to fill this entry and * it still needs to be filled. */ rdc->flags &= ~RDDIR; rdc->flags |= RDDIRREQ; rddir4_cache_rele(rp, rdc); mutex_exit(&rp->r_statelock); } void nfs4_async_commit(vnode_t *vp, page_t *plist, offset3 offset, count3 count, cred_t *cr, void (*commit)(vnode_t *, page_t *, offset3, count3, cred_t *)) { rnode4_t *rp; mntinfo4_t *mi; struct nfs4_async_reqs *args; page_t *pp; rp = VTOR4(vp); mi = VTOMI4(vp); /* * If we can't allocate a request structure, do the commit * operation synchronously in this thread's context. */ if ((args = kmem_alloc(sizeof (*args), KM_NOSLEEP)) == NULL) goto noasync; args->a_next = NULL; #ifdef DEBUG args->a_queuer = curthread; #endif VN_HOLD(vp); args->a_vp = vp; ASSERT(cr != NULL); crhold(cr); args->a_cred = cr; args->a_io = NFS4_COMMIT; args->a_nfs4_commit = commit; args->a_nfs4_plist = plist; args->a_nfs4_offset = offset; args->a_nfs4_count = count; mutex_enter(&mi->mi_async_lock); /* * If asyncio has been disabled, then make a synchronous request. * This check is done a second time in case async io was diabled * while this thread was blocked waiting for memory pressure to * reduce or for the queue to drain. */ if (mi->mi_max_threads == 0) { mutex_exit(&mi->mi_async_lock); VN_RELE(vp); crfree(cr); kmem_free(args, sizeof (*args)); goto noasync; } /* * Link request structure into the async list and * wakeup async thread to do the i/o. */ if (mi->mi_async_reqs[NFS4_COMMIT] == NULL) { mi->mi_async_reqs[NFS4_COMMIT] = args; mi->mi_async_tail[NFS4_COMMIT] = args; } else { mi->mi_async_tail[NFS4_COMMIT]->a_next = args; mi->mi_async_tail[NFS4_COMMIT] = args; } mutex_enter(&rp->r_statelock); rp->r_count++; mutex_exit(&rp->r_statelock); if (mi->mi_io_kstats) { mutex_enter(&mi->mi_lock); kstat_waitq_enter(KSTAT_IO_PTR(mi->mi_io_kstats)); mutex_exit(&mi->mi_lock); } mi->mi_async_req_count++; ASSERT(mi->mi_async_req_count != 0); cv_signal(&mi->mi_async_reqs_cv); mutex_exit(&mi->mi_async_lock); return; noasync: if (curproc == proc_pageout || curproc == proc_fsflush || nfs_zone() != mi->mi_zone) { while (plist != NULL) { pp = plist; page_sub(&plist, pp); pp->p_fsdata = C_COMMIT; page_unlock(pp); } return; } (*commit)(vp, plist, offset, count, cr); } /* * nfs4_async_inactive - hand off a VOP_INACTIVE call to a thread. The * reference to the vnode is handed over to the thread; the caller should * no longer refer to the vnode. * * Unlike most of the async routines, this handoff is needed for * correctness reasons, not just performance. So doing operations in the * context of the current thread is not an option. */ void nfs4_async_inactive(vnode_t *vp, cred_t *cr) { mntinfo4_t *mi; struct nfs4_async_reqs *args; boolean_t signal_inactive_thread = B_FALSE; mi = VTOMI4(vp); args = kmem_alloc(sizeof (*args), KM_SLEEP); args->a_next = NULL; #ifdef DEBUG args->a_queuer = curthread; #endif args->a_vp = vp; ASSERT(cr != NULL); crhold(cr); args->a_cred = cr; args->a_io = NFS4_INACTIVE; /* * Note that we don't check mi->mi_max_threads here, since we * *need* to get rid of this vnode regardless of whether someone * set nfs4_max_threads to zero in /etc/system. * * The manager thread knows about this and is willing to create * at least one thread to accommodate us. */ mutex_enter(&mi->mi_async_lock); if (mi->mi_inactive_thread == NULL) { rnode4_t *rp; vnode_t *unldvp = NULL; char *unlname; cred_t *unlcred; mutex_exit(&mi->mi_async_lock); /* * We just need to free up the memory associated with the * vnode, which can be safely done from within the current * context. */ crfree(cr); /* drop our reference */ kmem_free(args, sizeof (*args)); rp = VTOR4(vp); mutex_enter(&rp->r_statelock); if (rp->r_unldvp != NULL) { unldvp = rp->r_unldvp; rp->r_unldvp = NULL; unlname = rp->r_unlname; rp->r_unlname = NULL; unlcred = rp->r_unlcred; rp->r_unlcred = NULL; } mutex_exit(&rp->r_statelock); /* * No need to explicitly throw away any cached pages. The * eventual r4inactive() will attempt a synchronous * VOP_PUTPAGE() which will immediately fail since the request * is coming from the wrong zone, and then will proceed to call * nfs4_invalidate_pages() which will clean things up for us. * * Throw away the delegation here so rp4_addfree()'s attempt to * return any existing delegations becomes a no-op. */ if (rp->r_deleg_type != OPEN_DELEGATE_NONE) { (void) nfs_rw_enter_sig(&mi->mi_recovlock, RW_READER, FALSE); (void) nfs4delegreturn(rp, NFS4_DR_DISCARD); nfs_rw_exit(&mi->mi_recovlock); } nfs4_clear_open_streams(rp); rp4_addfree(rp, cr); if (unldvp != NULL) { kmem_free(unlname, MAXNAMELEN); VN_RELE(unldvp); crfree(unlcred); } return; } if (mi->mi_manager_thread == NULL) { /* * We want to talk to the inactive thread. */ signal_inactive_thread = B_TRUE; } /* * Enqueue the vnode and wake up either the special thread (empty * list) or an async thread. */ if (mi->mi_async_reqs[NFS4_INACTIVE] == NULL) { mi->mi_async_reqs[NFS4_INACTIVE] = args; mi->mi_async_tail[NFS4_INACTIVE] = args; signal_inactive_thread = B_TRUE; } else { mi->mi_async_tail[NFS4_INACTIVE]->a_next = args; mi->mi_async_tail[NFS4_INACTIVE] = args; } if (signal_inactive_thread) { cv_signal(&mi->mi_inact_req_cv); } else { mi->mi_async_req_count++; ASSERT(mi->mi_async_req_count != 0); cv_signal(&mi->mi_async_reqs_cv); } mutex_exit(&mi->mi_async_lock); } int writerp4(rnode4_t *rp, caddr_t base, int tcount, struct uio *uio, int pgcreated) { int pagecreate; int n; int saved_n; caddr_t saved_base; u_offset_t offset; int error; int sm_error; vnode_t *vp = RTOV(rp); ASSERT(tcount <= MAXBSIZE && tcount <= uio->uio_resid); ASSERT(nfs_rw_lock_held(&rp->r_rwlock, RW_WRITER)); if (!vpm_enable) { ASSERT(((uintptr_t)base & MAXBOFFSET) + tcount <= MAXBSIZE); } /* * Move bytes in at most PAGESIZE chunks. We must avoid * spanning pages in uiomove() because page faults may cause * the cache to be invalidated out from under us. The r_size is not * updated until after the uiomove. If we push the last page of a * file before r_size is correct, we will lose the data written past * the current (and invalid) r_size. */ do { offset = uio->uio_loffset; pagecreate = 0; /* * n is the number of bytes required to satisfy the request * or the number of bytes to fill out the page. */ n = (int)MIN((PAGESIZE - (offset & PAGEOFFSET)), tcount); /* * Check to see if we can skip reading in the page * and just allocate the memory. We can do this * if we are going to rewrite the entire mapping * or if we are going to write to or beyond the current * end of file from the beginning of the mapping. * * The read of r_size is now protected by r_statelock. */ mutex_enter(&rp->r_statelock); /* * When pgcreated is nonzero the caller has already done * a segmap_getmapflt with forcefault 0 and S_WRITE. With * segkpm this means we already have at least one page * created and mapped at base. */ pagecreate = pgcreated || ((offset & PAGEOFFSET) == 0 && (n == PAGESIZE || ((offset + n) >= rp->r_size))); mutex_exit(&rp->r_statelock); if (!vpm_enable && pagecreate) { /* * The last argument tells segmap_pagecreate() to * always lock the page, as opposed to sometimes * returning with the page locked. This way we avoid a * fault on the ensuing uiomove(), but also * more importantly (to fix bug 1094402) we can * call segmap_fault() to unlock the page in all * cases. An alternative would be to modify * segmap_pagecreate() to tell us when it is * locking a page, but that's a fairly major * interface change. */ if (pgcreated == 0) (void) segmap_pagecreate(segkmap, base, (uint_t)n, 1); saved_base = base; saved_n = n; } /* * The number of bytes of data in the last page can not * be accurately be determined while page is being * uiomove'd to and the size of the file being updated. * Thus, inform threads which need to know accurately * how much data is in the last page of the file. They * will not do the i/o immediately, but will arrange for * the i/o to happen later when this modify operation * will have finished. */ ASSERT(!(rp->r_flags & R4MODINPROGRESS)); mutex_enter(&rp->r_statelock); rp->r_flags |= R4MODINPROGRESS; rp->r_modaddr = (offset & MAXBMASK); mutex_exit(&rp->r_statelock); if (vpm_enable) { /* * Copy data. If new pages are created, part of * the page that is not written will be initizliazed * with zeros. */ error = vpm_data_copy(vp, offset, n, uio, !pagecreate, NULL, 0, S_WRITE); } else { error = uiomove(base, n, UIO_WRITE, uio); } /* * r_size is the maximum number of * bytes known to be in the file. * Make sure it is at least as high as the * first unwritten byte pointed to by uio_loffset. */ mutex_enter(&rp->r_statelock); if (rp->r_size < uio->uio_loffset) rp->r_size = uio->uio_loffset; rp->r_flags &= ~R4MODINPROGRESS; rp->r_flags |= R4DIRTY; mutex_exit(&rp->r_statelock); /* n = # of bytes written */ n = (int)(uio->uio_loffset - offset); if (!vpm_enable) { base += n; } tcount -= n; /* * If we created pages w/o initializing them completely, * we need to zero the part that wasn't set up. * This happens on a most EOF write cases and if * we had some sort of error during the uiomove. */ if (!vpm_enable && pagecreate) { if ((uio->uio_loffset & PAGEOFFSET) || n == 0) (void) kzero(base, PAGESIZE - n); if (pgcreated) { /* * Caller is responsible for this page, * it was not created in this loop. */ pgcreated = 0; } else { /* * For bug 1094402: segmap_pagecreate locks * page. Unlock it. This also unlocks the * pages allocated by page_create_va() in * segmap_pagecreate(). */ sm_error = segmap_fault(kas.a_hat, segkmap, saved_base, saved_n, F_SOFTUNLOCK, S_WRITE); if (error == 0) error = sm_error; } } } while (tcount > 0 && error == 0); return (error); } int nfs4_putpages(vnode_t *vp, u_offset_t off, size_t len, int flags, cred_t *cr) { rnode4_t *rp; page_t *pp; u_offset_t eoff; u_offset_t io_off; size_t io_len; int error; int rdirty; int err; rp = VTOR4(vp); ASSERT(rp->r_count > 0); if (!nfs4_has_pages(vp)) return (0); ASSERT(vp->v_type != VCHR); /* * If R4OUTOFSPACE is set, then all writes turn into B_INVAL * writes. B_FORCE is set to force the VM system to actually * invalidate the pages, even if the i/o failed. The pages * need to get invalidated because they can't be written out * because there isn't any space left on either the server's * file system or in the user's disk quota. The B_FREE bit * is cleared to avoid confusion as to whether this is a * request to place the page on the freelist or to destroy * it. */ if ((rp->r_flags & R4OUTOFSPACE) || (vp->v_vfsp->vfs_flag & VFS_UNMOUNTED)) flags = (flags & ~B_FREE) | B_INVAL | B_FORCE; if (len == 0) { /* * If doing a full file synchronous operation, then clear * the R4DIRTY bit. If a page gets dirtied while the flush * is happening, then R4DIRTY will get set again. The * R4DIRTY bit must get cleared before the flush so that * we don't lose this information. * * If there are no full file async write operations * pending and RDIRTY bit is set, clear it. */ if (off == (u_offset_t)0 && !(flags & B_ASYNC) && (rp->r_flags & R4DIRTY)) { mutex_enter(&rp->r_statelock); rdirty = (rp->r_flags & R4DIRTY); rp->r_flags &= ~R4DIRTY; mutex_exit(&rp->r_statelock); } else if (flags & B_ASYNC && off == (u_offset_t)0) { mutex_enter(&rp->r_statelock); if (rp->r_flags & R4DIRTY && rp->r_awcount == 0) { rdirty = (rp->r_flags & R4DIRTY); rp->r_flags &= ~R4DIRTY; } mutex_exit(&rp->r_statelock); } else rdirty = 0; /* * Search the entire vp list for pages >= off, and flush * the dirty pages. */ error = pvn_vplist_dirty(vp, off, rp->r_putapage, flags, cr); /* * If an error occurred and the file was marked as dirty * before and we aren't forcibly invalidating pages, then * reset the R4DIRTY flag. */ if (error && rdirty && (flags & (B_INVAL | B_FORCE)) != (B_INVAL | B_FORCE)) { mutex_enter(&rp->r_statelock); rp->r_flags |= R4DIRTY; mutex_exit(&rp->r_statelock); } } else { /* * Do a range from [off...off + len) looking for pages * to deal with. */ error = 0; io_len = 0; eoff = off + len; mutex_enter(&rp->r_statelock); for (io_off = off; io_off < eoff && io_off < rp->r_size; io_off += io_len) { mutex_exit(&rp->r_statelock); /* * If we are not invalidating, synchronously * freeing or writing pages use the routine * page_lookup_nowait() to prevent reclaiming * them from the free list. */ if ((flags & B_INVAL) || !(flags & B_ASYNC)) { pp = page_lookup(vp, io_off, (flags & (B_INVAL | B_FREE)) ? SE_EXCL : SE_SHARED); } else { pp = page_lookup_nowait(vp, io_off, (flags & B_FREE) ? SE_EXCL : SE_SHARED); } if (pp == NULL || !pvn_getdirty(pp, flags)) io_len = PAGESIZE; else { err = (*rp->r_putapage)(vp, pp, &io_off, &io_len, flags, cr); if (!error) error = err; /* * "io_off" and "io_len" are returned as * the range of pages we actually wrote. * This allows us to skip ahead more quickly * since several pages may've been dealt * with by this iteration of the loop. */ } mutex_enter(&rp->r_statelock); } mutex_exit(&rp->r_statelock); } return (error); } void nfs4_invalidate_pages(vnode_t *vp, u_offset_t off, cred_t *cr) { rnode4_t *rp; rp = VTOR4(vp); if (IS_SHADOW(vp, rp)) vp = RTOV4(rp); mutex_enter(&rp->r_statelock); while (rp->r_flags & R4TRUNCATE) cv_wait(&rp->r_cv, &rp->r_statelock); rp->r_flags |= R4TRUNCATE; if (off == (u_offset_t)0) { rp->r_flags &= ~R4DIRTY; if (!(rp->r_flags & R4STALE)) rp->r_error = 0; } rp->r_truncaddr = off; mutex_exit(&rp->r_statelock); (void) pvn_vplist_dirty(vp, off, rp->r_putapage, B_INVAL | B_TRUNC, cr); mutex_enter(&rp->r_statelock); rp->r_flags &= ~R4TRUNCATE; cv_broadcast(&rp->r_cv); mutex_exit(&rp->r_statelock); } static int nfs4_mnt_kstat_update(kstat_t *ksp, int rw) { mntinfo4_t *mi; struct mntinfo_kstat *mik; vfs_t *vfsp; /* this is a read-only kstat. Bail out on a write */ if (rw == KSTAT_WRITE) return (EACCES); /* * We don't want to wait here as kstat_chain_lock could be held by * dounmount(). dounmount() takes vfs_reflock before the chain lock * and thus could lead to a deadlock. */ vfsp = (struct vfs *)ksp->ks_private; mi = VFTOMI4(vfsp); mik = (struct mntinfo_kstat *)ksp->ks_data; (void) strcpy(mik->mik_proto, mi->mi_curr_serv->sv_knconf->knc_proto); mik->mik_vers = (uint32_t)mi->mi_vers; mik->mik_flags = mi->mi_flags; /* * The sv_secdata holds the flavor the client specifies. * If the client uses default and a security negotiation * occurs, sv_currsec will point to the current flavor * selected from the server flavor list. * sv_currsec is NULL if no security negotiation takes place. */ mik->mik_secmod = mi->mi_curr_serv->sv_currsec ? mi->mi_curr_serv->sv_currsec->secmod : mi->mi_curr_serv->sv_secdata->secmod; mik->mik_curread = (uint32_t)mi->mi_curread; mik->mik_curwrite = (uint32_t)mi->mi_curwrite; mik->mik_retrans = mi->mi_retrans; mik->mik_timeo = mi->mi_timeo; mik->mik_acregmin = HR2SEC(mi->mi_acregmin); mik->mik_acregmax = HR2SEC(mi->mi_acregmax); mik->mik_acdirmin = HR2SEC(mi->mi_acdirmin); mik->mik_acdirmax = HR2SEC(mi->mi_acdirmax); mik->mik_noresponse = (uint32_t)mi->mi_noresponse; mik->mik_failover = (uint32_t)mi->mi_failover; mik->mik_remap = (uint32_t)mi->mi_remap; (void) strcpy(mik->mik_curserver, mi->mi_curr_serv->sv_hostname); return (0); } void nfs4_mnt_kstat_init(struct vfs *vfsp) { mntinfo4_t *mi = VFTOMI4(vfsp); /* * PSARC 2001/697 Contract Private Interface * All nfs kstats are under SunMC contract * Please refer to the PSARC listed above and contact * SunMC before making any changes! * * Changes must be reviewed by Solaris File Sharing * Changes must be communicated to contract-2001-697@sun.com * */ mi->mi_io_kstats = kstat_create_zone("nfs", getminor(vfsp->vfs_dev), NULL, "nfs", KSTAT_TYPE_IO, 1, 0, mi->mi_zone->zone_id); if (mi->mi_io_kstats) { if (mi->mi_zone->zone_id != GLOBAL_ZONEID) kstat_zone_add(mi->mi_io_kstats, GLOBAL_ZONEID); mi->mi_io_kstats->ks_lock = &mi->mi_lock; kstat_install(mi->mi_io_kstats); } if ((mi->mi_ro_kstats = kstat_create_zone("nfs", getminor(vfsp->vfs_dev), "mntinfo", "misc", KSTAT_TYPE_RAW, sizeof (struct mntinfo_kstat), 0, mi->mi_zone->zone_id)) != NULL) { if (mi->mi_zone->zone_id != GLOBAL_ZONEID) kstat_zone_add(mi->mi_ro_kstats, GLOBAL_ZONEID); mi->mi_ro_kstats->ks_update = nfs4_mnt_kstat_update; mi->mi_ro_kstats->ks_private = (void *)vfsp; kstat_install(mi->mi_ro_kstats); } nfs4_mnt_recov_kstat_init(vfsp); } void nfs4_write_error(vnode_t *vp, int error, cred_t *cr) { mntinfo4_t *mi; clock_t now = ddi_get_lbolt(); mi = VTOMI4(vp); /* * In case of forced unmount, do not print any messages * since it can flood the console with error messages. */ if (mi->mi_vfsp->vfs_flag & VFS_UNMOUNTED) return; /* * If the mount point is dead, not recoverable, do not * print error messages that can flood the console. */ if (mi->mi_flags & MI4_RECOV_FAIL) return; /* * No use in flooding the console with ENOSPC * messages from the same file system. */ if ((error != ENOSPC && error != EDQUOT) || now - mi->mi_printftime > 0) { zoneid_t zoneid = mi->mi_zone->zone_id; #ifdef DEBUG nfs_perror(error, "NFS%ld write error on host %s: %m.\n", mi->mi_vers, VTOR4(vp)->r_server->sv_hostname, NULL); #else nfs_perror(error, "NFS write error on host %s: %m.\n", VTOR4(vp)->r_server->sv_hostname, NULL); #endif if (error == ENOSPC || error == EDQUOT) { zcmn_err(zoneid, CE_CONT, "^File: userid=%d, groupid=%d\n", crgetuid(cr), crgetgid(cr)); if (crgetuid(curthread->t_cred) != crgetuid(cr) || crgetgid(curthread->t_cred) != crgetgid(cr)) { zcmn_err(zoneid, CE_CONT, "^User: userid=%d, groupid=%d\n", crgetuid(curthread->t_cred), crgetgid(curthread->t_cred)); } mi->mi_printftime = now + nfs_write_error_interval * hz; } sfh4_printfhandle(VTOR4(vp)->r_fh); #ifdef DEBUG if (error == EACCES) { zcmn_err(zoneid, CE_CONT, "nfs_bio: cred is%s kcred\n", cr == kcred ? "" : " not"); } #endif } } /* * Return non-zero if the given file can be safely memory mapped. Locks * are safe if whole-file (length and offset are both zero). */ #define SAFE_LOCK(flk) ((flk).l_start == 0 && (flk).l_len == 0) static int nfs4_safemap(const vnode_t *vp) { locklist_t *llp, *next_llp; int safe = 1; rnode4_t *rp = VTOR4(vp); ASSERT(nfs_rw_lock_held(&rp->r_lkserlock, RW_WRITER)); NFS4_DEBUG(nfs4_client_map_debug, (CE_NOTE, "nfs4_safemap: " "vp = %p", (void *)vp)); /* * Review all the locks for the vnode, both ones that have been * acquired and ones that are pending. We assume that * flk_active_locks_for_vp() has merged any locks that can be * merged (so that if a process has the entire file locked, it is * represented as a single lock). * * Note that we can't bail out of the loop if we find a non-safe * lock, because we have to free all the elements in the llp list. * We might be able to speed up this code slightly by not looking * at each lock's l_start and l_len fields once we've found a * non-safe lock. */ llp = flk_active_locks_for_vp(vp); while (llp) { NFS4_DEBUG(nfs4_client_map_debug, (CE_NOTE, "nfs4_safemap: active lock (%" PRId64 ", %" PRId64 ")", llp->ll_flock.l_start, llp->ll_flock.l_len)); if (!SAFE_LOCK(llp->ll_flock)) { safe = 0; NFS4_DEBUG(nfs4_client_map_debug, (CE_NOTE, "nfs4_safemap: unsafe active lock (%" PRId64 ", %" PRId64 ")", llp->ll_flock.l_start, llp->ll_flock.l_len)); } next_llp = llp->ll_next; VN_RELE(llp->ll_vp); kmem_free(llp, sizeof (*llp)); llp = next_llp; } NFS4_DEBUG(nfs4_client_map_debug, (CE_NOTE, "nfs4_safemap: %s", safe ? "safe" : "unsafe")); return (safe); } /* * Return whether there is a lost LOCK or LOCKU queued up for the given * file that would make an mmap request unsafe. cf. nfs4_safemap(). */ bool_t nfs4_map_lost_lock_conflict(vnode_t *vp) { bool_t conflict = FALSE; nfs4_lost_rqst_t *lrp; mntinfo4_t *mi = VTOMI4(vp); mutex_enter(&mi->mi_lock); for (lrp = list_head(&mi->mi_lost_state); lrp != NULL; lrp = list_next(&mi->mi_lost_state, lrp)) { if (lrp->lr_op != OP_LOCK && lrp->lr_op != OP_LOCKU) continue; ASSERT(lrp->lr_vp != NULL); if (!VOP_CMP(lrp->lr_vp, vp, NULL)) continue; /* different file */ if (!SAFE_LOCK(*lrp->lr_flk)) { conflict = TRUE; break; } } mutex_exit(&mi->mi_lock); return (conflict); } /* * nfs_lockcompletion: * * If the vnode has a lock that makes it unsafe to cache the file, mark it * as non cachable (set VNOCACHE bit). */ void nfs4_lockcompletion(vnode_t *vp, int cmd) { rnode4_t *rp = VTOR4(vp); ASSERT(nfs_rw_lock_held(&rp->r_lkserlock, RW_WRITER)); ASSERT(!IS_SHADOW(vp, rp)); if (cmd == F_SETLK || cmd == F_SETLKW) { if (!nfs4_safemap(vp)) { mutex_enter(&vp->v_lock); vp->v_flag |= VNOCACHE; mutex_exit(&vp->v_lock); } else { mutex_enter(&vp->v_lock); vp->v_flag &= ~VNOCACHE; mutex_exit(&vp->v_lock); } } /* * The cached attributes of the file are stale after acquiring * the lock on the file. They were updated when the file was * opened, but not updated when the lock was acquired. Therefore the * cached attributes are invalidated after the lock is obtained. */ PURGE_ATTRCACHE4(vp); } /* ARGSUSED */ static void * nfs4_mi_init(zoneid_t zoneid) { struct mi4_globals *mig; mig = kmem_alloc(sizeof (*mig), KM_SLEEP); mutex_init(&mig->mig_lock, NULL, MUTEX_DEFAULT, NULL); list_create(&mig->mig_list, sizeof (mntinfo4_t), offsetof(mntinfo4_t, mi_zone_node)); mig->mig_destructor_called = B_FALSE; return (mig); } /* * Callback routine to tell all NFSv4 mounts in the zone to start tearing down * state and killing off threads. */ /* ARGSUSED */ static void nfs4_mi_shutdown(zoneid_t zoneid, void *data) { struct mi4_globals *mig = data; mntinfo4_t *mi; nfs4_server_t *np; NFS4_DEBUG(nfs4_client_zone_debug, (CE_NOTE, "nfs4_mi_shutdown zone %d\n", zoneid)); ASSERT(mig != NULL); for (;;) { mutex_enter(&mig->mig_lock); mi = list_head(&mig->mig_list); if (mi == NULL) { mutex_exit(&mig->mig_lock); break; } NFS4_DEBUG(nfs4_client_zone_debug, (CE_NOTE, "nfs4_mi_shutdown stopping vfs %p\n", (void *)mi->mi_vfsp)); /* * purge the DNLC for this filesystem */ (void) dnlc_purge_vfsp(mi->mi_vfsp, 0); /* * Tell existing async worker threads to exit. */ mutex_enter(&mi->mi_async_lock); mi->mi_max_threads = 0; NFS4_WAKEALL_ASYNC_WORKERS(mi->mi_async_work_cv); /* * Set the appropriate flags, signal and wait for both the * async manager and the inactive thread to exit when they're * done with their current work. */ mutex_enter(&mi->mi_lock); mi->mi_flags |= (MI4_ASYNC_MGR_STOP|MI4_DEAD); mutex_exit(&mi->mi_lock); mutex_exit(&mi->mi_async_lock); if (mi->mi_manager_thread) { nfs4_async_manager_stop(mi->mi_vfsp); } if (mi->mi_inactive_thread) { mutex_enter(&mi->mi_async_lock); cv_signal(&mi->mi_inact_req_cv); /* * Wait for the inactive thread to exit. */ while (mi->mi_inactive_thread != NULL) { cv_wait(&mi->mi_async_cv, &mi->mi_async_lock); } mutex_exit(&mi->mi_async_lock); } /* * Wait for the recovery thread to complete, that is, it will * signal when it is done using the "mi" structure and about * to exit */ mutex_enter(&mi->mi_lock); while (mi->mi_in_recovery > 0) cv_wait(&mi->mi_cv_in_recov, &mi->mi_lock); mutex_exit(&mi->mi_lock); /* * We're done when every mi has been done or the list is empty. * This one is done, remove it from the list. */ list_remove(&mig->mig_list, mi); mutex_exit(&mig->mig_lock); zone_rele_ref(&mi->mi_zone_ref, ZONE_REF_NFSV4); /* * Release hold on vfs and mi done to prevent race with zone * shutdown. This releases the hold in nfs4_mi_zonelist_add. */ VFS_RELE(mi->mi_vfsp); MI4_RELE(mi); } /* * Tell each renew thread in the zone to exit */ mutex_enter(&nfs4_server_lst_lock); for (np = nfs4_server_lst.forw; np != &nfs4_server_lst; np = np->forw) { mutex_enter(&np->s_lock); if (np->zoneid == zoneid) { /* * We add another hold onto the nfs4_server_t * because this will make sure tha the nfs4_server_t * stays around until nfs4_callback_fini_zone destroys * the zone. This way, the renew thread can * unconditionally release its holds on the * nfs4_server_t. */ np->s_refcnt++; nfs4_mark_srv_dead(np); } mutex_exit(&np->s_lock); } mutex_exit(&nfs4_server_lst_lock); } static void nfs4_mi_free_globals(struct mi4_globals *mig) { list_destroy(&mig->mig_list); /* makes sure the list is empty */ mutex_destroy(&mig->mig_lock); kmem_free(mig, sizeof (*mig)); } /* ARGSUSED */ static void nfs4_mi_destroy(zoneid_t zoneid, void *data) { struct mi4_globals *mig = data; NFS4_DEBUG(nfs4_client_zone_debug, (CE_NOTE, "nfs4_mi_destroy zone %d\n", zoneid)); ASSERT(mig != NULL); mutex_enter(&mig->mig_lock); if (list_head(&mig->mig_list) != NULL) { /* Still waiting for VFS_FREEVFS() */ mig->mig_destructor_called = B_TRUE; mutex_exit(&mig->mig_lock); return; } nfs4_mi_free_globals(mig); } /* * Add an NFS mount to the per-zone list of NFS mounts. */ void nfs4_mi_zonelist_add(mntinfo4_t *mi) { struct mi4_globals *mig; mig = zone_getspecific(mi4_list_key, mi->mi_zone); mutex_enter(&mig->mig_lock); list_insert_head(&mig->mig_list, mi); /* * hold added to eliminate race with zone shutdown -this will be * released in mi_shutdown */ MI4_HOLD(mi); VFS_HOLD(mi->mi_vfsp); mutex_exit(&mig->mig_lock); } /* * Remove an NFS mount from the per-zone list of NFS mounts. */ int nfs4_mi_zonelist_remove(mntinfo4_t *mi) { struct mi4_globals *mig; int ret = 0; mig = zone_getspecific(mi4_list_key, mi->mi_zone); mutex_enter(&mig->mig_lock); mutex_enter(&mi->mi_lock); /* if this mi is marked dead, then the zone already released it */ if (!(mi->mi_flags & MI4_DEAD)) { list_remove(&mig->mig_list, mi); mutex_exit(&mi->mi_lock); /* release the holds put on in zonelist_add(). */ VFS_RELE(mi->mi_vfsp); MI4_RELE(mi); ret = 1; } else { mutex_exit(&mi->mi_lock); } /* * We can be called asynchronously by VFS_FREEVFS() after the zone * shutdown/destroy callbacks have executed; if so, clean up the zone's * mi globals. */ if (list_head(&mig->mig_list) == NULL && mig->mig_destructor_called == B_TRUE) { nfs4_mi_free_globals(mig); return (ret); } mutex_exit(&mig->mig_lock); return (ret); } void nfs_free_mi4(mntinfo4_t *mi) { nfs4_open_owner_t *foop; nfs4_oo_hash_bucket_t *bucketp; nfs4_debug_msg_t *msgp; int i; servinfo4_t *svp; /* * Code introduced here should be carefully evaluated to make * sure none of the freed resources are accessed either directly * or indirectly after freeing them. For eg: Introducing calls to * NFS4_DEBUG that use mntinfo4_t structure member after freeing * the structure members or other routines calling back into NFS * accessing freed mntinfo4_t structure member. */ mutex_enter(&mi->mi_lock); ASSERT(mi->mi_recovthread == NULL); ASSERT(mi->mi_flags & MI4_ASYNC_MGR_STOP); mutex_exit(&mi->mi_lock); mutex_enter(&mi->mi_async_lock); ASSERT(mi->mi_threads[NFS4_ASYNC_QUEUE] == 0 && mi->mi_threads[NFS4_ASYNC_PGOPS_QUEUE] == 0); ASSERT(mi->mi_manager_thread == NULL); mutex_exit(&mi->mi_async_lock); if (mi->mi_io_kstats) { kstat_delete(mi->mi_io_kstats); mi->mi_io_kstats = NULL; } if (mi->mi_ro_kstats) { kstat_delete(mi->mi_ro_kstats); mi->mi_ro_kstats = NULL; } if (mi->mi_recov_ksp) { kstat_delete(mi->mi_recov_ksp); mi->mi_recov_ksp = NULL; } mutex_enter(&mi->mi_msg_list_lock); while (msgp = list_head(&mi->mi_msg_list)) { list_remove(&mi->mi_msg_list, msgp); nfs4_free_msg(msgp); } mutex_exit(&mi->mi_msg_list_lock); list_destroy(&mi->mi_msg_list); if (mi->mi_fname != NULL) fn_rele(&mi->mi_fname); if (mi->mi_rootfh != NULL) sfh4_rele(&mi->mi_rootfh); if (mi->mi_srvparentfh != NULL) sfh4_rele(&mi->mi_srvparentfh); svp = mi->mi_servers; sv4_free(svp); mutex_destroy(&mi->mi_lock); mutex_destroy(&mi->mi_async_lock); mutex_destroy(&mi->mi_msg_list_lock); mutex_destroy(&mi->mi_rnodes_lock); nfs_rw_destroy(&mi->mi_recovlock); nfs_rw_destroy(&mi->mi_rename_lock); nfs_rw_destroy(&mi->mi_fh_lock); cv_destroy(&mi->mi_failover_cv); cv_destroy(&mi->mi_async_reqs_cv); cv_destroy(&mi->mi_async_work_cv[NFS4_ASYNC_QUEUE]); cv_destroy(&mi->mi_async_work_cv[NFS4_ASYNC_PGOPS_QUEUE]); cv_destroy(&mi->mi_async_cv); cv_destroy(&mi->mi_inact_req_cv); /* * Destroy the oo hash lists and mutexes for the cred hash table. */ for (i = 0; i < NFS4_NUM_OO_BUCKETS; i++) { bucketp = &(mi->mi_oo_list[i]); /* Destroy any remaining open owners on the list */ foop = list_head(&bucketp->b_oo_hash_list); while (foop != NULL) { list_remove(&bucketp->b_oo_hash_list, foop); nfs4_destroy_open_owner(foop); foop = list_head(&bucketp->b_oo_hash_list); } list_destroy(&bucketp->b_oo_hash_list); mutex_destroy(&bucketp->b_lock); } /* * Empty and destroy the freed open owner list. */ foop = list_head(&mi->mi_foo_list); while (foop != NULL) { list_remove(&mi->mi_foo_list, foop); nfs4_destroy_open_owner(foop); foop = list_head(&mi->mi_foo_list); } list_destroy(&mi->mi_foo_list); list_destroy(&mi->mi_bseqid_list); list_destroy(&mi->mi_lost_state); list_destroy(&mi->mi_rnodes); avl_destroy(&mi->mi_filehandles); kmem_free(mi, sizeof (*mi)); } void mi_hold(mntinfo4_t *mi) { atomic_inc_32(&mi->mi_count); ASSERT(mi->mi_count != 0); } void mi_rele(mntinfo4_t *mi) { ASSERT(mi->mi_count != 0); if (atomic_dec_32_nv(&mi->mi_count) == 0) { nfs_free_mi4(mi); } } vnode_t nfs4_xattr_notsupp_vnode; void nfs4_clnt_init(void) { nfs4_vnops_init(); (void) nfs4_rnode_init(); (void) nfs4_shadow_init(); (void) nfs4_acache_init(); (void) nfs4_subr_init(); nfs4_acl_init(); nfs_idmap_init(); nfs4_callback_init(); nfs4_secinfo_init(); #ifdef DEBUG tsd_create(&nfs4_tsd_key, NULL); #endif /* * Add a CPR callback so that we can update client * lease after a suspend and resume. */ cid = callb_add(nfs4_client_cpr_callb, 0, CB_CL_CPR_RPC, "nfs4"); zone_key_create(&mi4_list_key, nfs4_mi_init, nfs4_mi_shutdown, nfs4_mi_destroy); /* * Initialise the reference count of the notsupp xattr cache vnode to 1 * so that it never goes away (VOP_INACTIVE isn't called on it). */ nfs4_xattr_notsupp_vnode.v_count = 1; } void nfs4_clnt_fini(void) { (void) zone_key_delete(mi4_list_key); nfs4_vnops_fini(); (void) nfs4_rnode_fini(); (void) nfs4_shadow_fini(); (void) nfs4_acache_fini(); (void) nfs4_subr_fini(); nfs_idmap_fini(); nfs4_callback_fini(); nfs4_secinfo_fini(); #ifdef DEBUG tsd_destroy(&nfs4_tsd_key); #endif if (cid) (void) callb_delete(cid); } /*ARGSUSED*/ static boolean_t nfs4_client_cpr_callb(void *arg, int code) { /* * We get called for Suspend and Resume events. * For the suspend case we simply don't care! */ if (code == CB_CODE_CPR_CHKPT) { return (B_TRUE); } /* * When we get to here we are in the process of * resuming the system from a previous suspend. */ nfs4_client_resumed = gethrestime_sec(); return (B_TRUE); } void nfs4_renew_lease_thread(nfs4_server_t *sp) { int error = 0; time_t tmp_last_renewal_time, tmp_time, tmp_now_time, kip_secs; clock_t tick_delay = 0; clock_t time_left = 0; callb_cpr_t cpr_info; kmutex_t cpr_lock; NFS4_DEBUG(nfs4_client_lease_debug, (CE_NOTE, "nfs4_renew_lease_thread: acting on sp 0x%p", (void*)sp)); mutex_init(&cpr_lock, NULL, MUTEX_DEFAULT, NULL); CALLB_CPR_INIT(&cpr_info, &cpr_lock, callb_generic_cpr, "nfsv4Lease"); mutex_enter(&sp->s_lock); /* sp->s_lease_time is set via a GETATTR */ sp->last_renewal_time = gethrestime_sec(); sp->lease_valid = NFS4_LEASE_UNINITIALIZED; ASSERT(sp->s_refcnt >= 1); for (;;) { if (!sp->state_ref_count || sp->lease_valid != NFS4_LEASE_VALID) { kip_secs = MAX((sp->s_lease_time >> 1) - (3 * sp->propagation_delay.tv_sec), 1); tick_delay = SEC_TO_TICK(kip_secs); NFS4_DEBUG(nfs4_client_lease_debug, (CE_NOTE, "nfs4_renew_lease_thread: no renew : thread " "wait %ld secs", kip_secs)); NFS4_DEBUG(nfs4_client_lease_debug, (CE_NOTE, "nfs4_renew_lease_thread: no renew : " "state_ref_count %d, lease_valid %d", sp->state_ref_count, sp->lease_valid)); mutex_enter(&cpr_lock); CALLB_CPR_SAFE_BEGIN(&cpr_info); mutex_exit(&cpr_lock); time_left = cv_reltimedwait(&sp->cv_thread_exit, &sp->s_lock, tick_delay, TR_CLOCK_TICK); mutex_enter(&cpr_lock); CALLB_CPR_SAFE_END(&cpr_info, &cpr_lock); mutex_exit(&cpr_lock); NFS4_DEBUG(nfs4_client_lease_debug, (CE_NOTE, "nfs4_renew_lease_thread: no renew: " "time left %ld", time_left)); if (sp->s_thread_exit == NFS4_THREAD_EXIT) goto die; continue; } tmp_last_renewal_time = sp->last_renewal_time; tmp_time = gethrestime_sec() - sp->last_renewal_time + (3 * sp->propagation_delay.tv_sec); NFS4_DEBUG(nfs4_client_lease_debug, (CE_NOTE, "nfs4_renew_lease_thread: tmp_time %ld, " "sp->last_renewal_time %ld", tmp_time, sp->last_renewal_time)); kip_secs = MAX((sp->s_lease_time >> 1) - tmp_time, 1); tick_delay = SEC_TO_TICK(kip_secs); NFS4_DEBUG(nfs4_client_lease_debug, (CE_NOTE, "nfs4_renew_lease_thread: valid lease: sleep for %ld " "secs", kip_secs)); mutex_enter(&cpr_lock); CALLB_CPR_SAFE_BEGIN(&cpr_info); mutex_exit(&cpr_lock); time_left = cv_reltimedwait(&sp->cv_thread_exit, &sp->s_lock, tick_delay, TR_CLOCK_TICK); mutex_enter(&cpr_lock); CALLB_CPR_SAFE_END(&cpr_info, &cpr_lock); mutex_exit(&cpr_lock); NFS4_DEBUG(nfs4_client_lease_debug, (CE_NOTE, "nfs4_renew_lease_thread: valid lease: time left %ld :" "sp last_renewal_time %ld, nfs4_client_resumed %ld, " "tmp_last_renewal_time %ld", time_left, sp->last_renewal_time, nfs4_client_resumed, tmp_last_renewal_time)); if (sp->s_thread_exit == NFS4_THREAD_EXIT) goto die; if (tmp_last_renewal_time == sp->last_renewal_time || (nfs4_client_resumed != 0 && nfs4_client_resumed > sp->last_renewal_time)) { /* * Issue RENEW op since we haven't renewed the lease * since we slept. */ tmp_now_time = gethrestime_sec(); error = nfs4renew(sp); /* * Need to re-acquire sp's lock, nfs4renew() * relinqueshes it. */ mutex_enter(&sp->s_lock); /* * See if someone changed s_thread_exit while we gave * up s_lock. */ if (sp->s_thread_exit == NFS4_THREAD_EXIT) goto die; if (!error) { /* * check to see if we implicitly renewed while * we waited for a reply for our RENEW call. */ if (tmp_last_renewal_time == sp->last_renewal_time) { /* no implicit renew came */ sp->last_renewal_time = tmp_now_time; } else { NFS4_DEBUG(nfs4_client_lease_debug, (CE_NOTE, "renew_thread: did " "implicit renewal before reply " "from server for RENEW")); } } else { /* figure out error */ NFS4_DEBUG(nfs4_client_lease_debug, (CE_NOTE, "renew_thread: nfs4renew returned error" " %d", error)); } } } die: NFS4_DEBUG(nfs4_client_lease_debug, (CE_NOTE, "nfs4_renew_lease_thread: thread exiting")); while (sp->s_otw_call_count != 0) { NFS4_DEBUG(nfs4_client_lease_debug, (CE_NOTE, "nfs4_renew_lease_thread: waiting for outstanding " "otw calls to finish for sp 0x%p, current " "s_otw_call_count %d", (void *)sp, sp->s_otw_call_count)); mutex_enter(&cpr_lock); CALLB_CPR_SAFE_BEGIN(&cpr_info); mutex_exit(&cpr_lock); cv_wait(&sp->s_cv_otw_count, &sp->s_lock); mutex_enter(&cpr_lock); CALLB_CPR_SAFE_END(&cpr_info, &cpr_lock); mutex_exit(&cpr_lock); } mutex_exit(&sp->s_lock); nfs4_server_rele(sp); /* free the thread's reference */ nfs4_server_rele(sp); /* free the list's reference */ sp = NULL; done: mutex_enter(&cpr_lock); CALLB_CPR_EXIT(&cpr_info); /* drops cpr_lock */ mutex_destroy(&cpr_lock); NFS4_DEBUG(nfs4_client_lease_debug, (CE_NOTE, "nfs4_renew_lease_thread: renew thread exit officially")); zthread_exit(); /* NOT REACHED */ } /* * Send out a RENEW op to the server. * Assumes sp is locked down. */ static int nfs4renew(nfs4_server_t *sp) { COMPOUND4args_clnt args; COMPOUND4res_clnt res; nfs_argop4 argop[1]; int doqueue = 1; int rpc_error; cred_t *cr; mntinfo4_t *mi; timespec_t prop_time, after_time; int needrecov = FALSE; nfs4_recov_state_t recov_state; nfs4_error_t e = { 0, NFS4_OK, RPC_SUCCESS }; NFS4_DEBUG(nfs4_client_lease_debug, (CE_NOTE, "nfs4renew")); recov_state.rs_flags = 0; recov_state.rs_num_retry_despite_err = 0; recov_retry: mi = sp->mntinfo4_list; VFS_HOLD(mi->mi_vfsp); mutex_exit(&sp->s_lock); ASSERT(mi != NULL); e.error = nfs4_start_op(mi, NULL, NULL, &recov_state); if (e.error) { VFS_RELE(mi->mi_vfsp); return (e.error); } /* Check to see if we're dealing with a marked-dead sp */ mutex_enter(&sp->s_lock); if (sp->s_thread_exit == NFS4_THREAD_EXIT) { mutex_exit(&sp->s_lock); nfs4_end_op(mi, NULL, NULL, &recov_state, needrecov); VFS_RELE(mi->mi_vfsp); return (0); } /* Make sure mi hasn't changed on us */ if (mi != sp->mntinfo4_list) { /* Must drop sp's lock to avoid a recursive mutex enter */ mutex_exit(&sp->s_lock); nfs4_end_op(mi, NULL, NULL, &recov_state, needrecov); VFS_RELE(mi->mi_vfsp); mutex_enter(&sp->s_lock); goto recov_retry; } mutex_exit(&sp->s_lock); args.ctag = TAG_RENEW; args.array_len = 1; args.array = argop; argop[0].argop = OP_RENEW; mutex_enter(&sp->s_lock); argop[0].nfs_argop4_u.oprenew.clientid = sp->clientid; cr = sp->s_cred; crhold(cr); mutex_exit(&sp->s_lock); ASSERT(cr != NULL); /* used to figure out RTT for sp */ gethrestime(&prop_time); NFS4_DEBUG(nfs4_client_call_debug, (CE_NOTE, "nfs4renew: %s call, sp 0x%p", needrecov ? "recov" : "first", (void*)sp)); NFS4_DEBUG(nfs4_client_lease_debug, (CE_NOTE, "before: %ld s %ld ns ", prop_time.tv_sec, prop_time.tv_nsec)); DTRACE_PROBE2(nfs4__renew__start, nfs4_server_t *, sp, mntinfo4_t *, mi); rfs4call(mi, &args, &res, cr, &doqueue, 0, &e); crfree(cr); DTRACE_PROBE2(nfs4__renew__end, nfs4_server_t *, sp, mntinfo4_t *, mi); gethrestime(&after_time); mutex_enter(&sp->s_lock); sp->propagation_delay.tv_sec = MAX(1, after_time.tv_sec - prop_time.tv_sec); mutex_exit(&sp->s_lock); NFS4_DEBUG(nfs4_client_lease_debug, (CE_NOTE, "after : %ld s %ld ns ", after_time.tv_sec, after_time.tv_nsec)); if (e.error == 0 && res.status == NFS4ERR_CB_PATH_DOWN) { (void) xdr_free(xdr_COMPOUND4res_clnt, (caddr_t)&res); nfs4_delegreturn_all(sp); nfs4_end_op(mi, NULL, NULL, &recov_state, needrecov); VFS_RELE(mi->mi_vfsp); /* * If the server returns CB_PATH_DOWN, it has renewed * the lease and informed us that the callback path is * down. Since the lease is renewed, just return 0 and * let the renew thread proceed as normal. */ return (0); } needrecov = nfs4_needs_recovery(&e, FALSE, mi->mi_vfsp); if (!needrecov && e.error) { nfs4_end_op(mi, NULL, NULL, &recov_state, needrecov); VFS_RELE(mi->mi_vfsp); return (e.error); } rpc_error = e.error; if (needrecov) { NFS4_DEBUG(nfs4_client_recov_debug, (CE_NOTE, "nfs4renew: initiating recovery\n")); if (nfs4_start_recovery(&e, mi, NULL, NULL, NULL, NULL, OP_RENEW, NULL, NULL, NULL) == FALSE) { nfs4_end_op(mi, NULL, NULL, &recov_state, needrecov); VFS_RELE(mi->mi_vfsp); if (!e.error) (void) xdr_free(xdr_COMPOUND4res_clnt, (caddr_t)&res); mutex_enter(&sp->s_lock); goto recov_retry; } /* fall through for res.status case */ } if (res.status) { if (res.status == NFS4ERR_LEASE_MOVED) { /*EMPTY*/ /* * XXX need to try every mntinfo4 in sp->mntinfo4_list * to renew the lease on that server */ } e.error = geterrno4(res.status); } if (!rpc_error) (void) xdr_free(xdr_COMPOUND4res_clnt, (caddr_t)&res); nfs4_end_op(mi, NULL, NULL, &recov_state, needrecov); VFS_RELE(mi->mi_vfsp); return (e.error); } void nfs4_inc_state_ref_count(mntinfo4_t *mi) { nfs4_server_t *sp; /* this locks down sp if it is found */ sp = find_nfs4_server(mi); if (sp != NULL) { nfs4_inc_state_ref_count_nolock(sp, mi); mutex_exit(&sp->s_lock); nfs4_server_rele(sp); } } /* * Bump the number of OPEN files (ie: those with state) so we know if this * nfs4_server has any state to maintain a lease for or not. * * Also, marks the nfs4_server's lease valid if it hasn't been done so already. */ void nfs4_inc_state_ref_count_nolock(nfs4_server_t *sp, mntinfo4_t *mi) { ASSERT(mutex_owned(&sp->s_lock)); sp->state_ref_count++; NFS4_DEBUG(nfs4_client_lease_debug, (CE_NOTE, "nfs4_inc_state_ref_count: state_ref_count now %d", sp->state_ref_count)); if (sp->lease_valid == NFS4_LEASE_UNINITIALIZED) sp->lease_valid = NFS4_LEASE_VALID; /* * If this call caused the lease to be marked valid and/or * took the state_ref_count from 0 to 1, then start the time * on lease renewal. */ if (sp->lease_valid == NFS4_LEASE_VALID && sp->state_ref_count == 1) sp->last_renewal_time = gethrestime_sec(); /* update the number of open files for mi */ mi->mi_open_files++; } void nfs4_dec_state_ref_count(mntinfo4_t *mi) { nfs4_server_t *sp; /* this locks down sp if it is found */ sp = find_nfs4_server_all(mi, 1); if (sp != NULL) { nfs4_dec_state_ref_count_nolock(sp, mi); mutex_exit(&sp->s_lock); nfs4_server_rele(sp); } } /* * Decrement the number of OPEN files (ie: those with state) so we know if * this nfs4_server has any state to maintain a lease for or not. */ void nfs4_dec_state_ref_count_nolock(nfs4_server_t *sp, mntinfo4_t *mi) { ASSERT(mutex_owned(&sp->s_lock)); ASSERT(sp->state_ref_count != 0); sp->state_ref_count--; NFS4_DEBUG(nfs4_client_lease_debug, (CE_NOTE, "nfs4_dec_state_ref_count: state ref count now %d", sp->state_ref_count)); mi->mi_open_files--; NFS4_DEBUG(nfs4_client_lease_debug, (CE_NOTE, "nfs4_dec_state_ref_count: mi open files %d, v4 flags 0x%x", mi->mi_open_files, mi->mi_flags)); /* We don't have to hold the mi_lock to test mi_flags */ if (mi->mi_open_files == 0 && (mi->mi_flags & MI4_REMOVE_ON_LAST_CLOSE)) { NFS4_DEBUG(nfs4_client_lease_debug, (CE_NOTE, "nfs4_dec_state_ref_count: remove mntinfo4 %p since " "we have closed the last open file", (void*)mi)); nfs4_remove_mi_from_server(mi, sp); } } bool_t inlease(nfs4_server_t *sp) { bool_t result; ASSERT(mutex_owned(&sp->s_lock)); if (sp->lease_valid == NFS4_LEASE_VALID && gethrestime_sec() < sp->last_renewal_time + sp->s_lease_time) result = TRUE; else result = FALSE; return (result); } /* * Return non-zero if the given nfs4_server_t is going through recovery. */ int nfs4_server_in_recovery(nfs4_server_t *sp) { return (nfs_rw_lock_held(&sp->s_recovlock, RW_WRITER)); } /* * Compare two shared filehandle objects. Returns -1, 0, or +1, if the * first is less than, equal to, or greater than the second. */ int sfh4cmp(const void *p1, const void *p2) { const nfs4_sharedfh_t *sfh1 = (const nfs4_sharedfh_t *)p1; const nfs4_sharedfh_t *sfh2 = (const nfs4_sharedfh_t *)p2; return (nfs4cmpfh(&sfh1->sfh_fh, &sfh2->sfh_fh)); } /* * Create a table for shared filehandle objects. */ void sfh4_createtab(avl_tree_t *tab) { avl_create(tab, sfh4cmp, sizeof (nfs4_sharedfh_t), offsetof(nfs4_sharedfh_t, sfh_tree)); } /* * Return a shared filehandle object for the given filehandle. The caller * is responsible for eventually calling sfh4_rele(). */ nfs4_sharedfh_t * sfh4_put(const nfs_fh4 *fh, mntinfo4_t *mi, nfs4_sharedfh_t *key) { nfs4_sharedfh_t *sfh, *nsfh; avl_index_t where; nfs4_sharedfh_t skey; if (!key) { skey.sfh_fh = *fh; key = &skey; } nsfh = kmem_alloc(sizeof (nfs4_sharedfh_t), KM_SLEEP); nsfh->sfh_fh.nfs_fh4_len = fh->nfs_fh4_len; /* * We allocate the largest possible filehandle size because it's * not that big, and it saves us from possibly having to resize the * buffer later. */ nsfh->sfh_fh.nfs_fh4_val = kmem_alloc(NFS4_FHSIZE, KM_SLEEP); bcopy(fh->nfs_fh4_val, nsfh->sfh_fh.nfs_fh4_val, fh->nfs_fh4_len); mutex_init(&nsfh->sfh_lock, NULL, MUTEX_DEFAULT, NULL); nsfh->sfh_refcnt = 1; nsfh->sfh_flags = SFH4_IN_TREE; nsfh->sfh_mi = mi; NFS4_DEBUG(nfs4_sharedfh_debug, (CE_NOTE, "sfh4_get: new object (%p)", (void *)nsfh)); (void) nfs_rw_enter_sig(&mi->mi_fh_lock, RW_WRITER, 0); sfh = avl_find(&mi->mi_filehandles, key, &where); if (sfh != NULL) { mutex_enter(&sfh->sfh_lock); sfh->sfh_refcnt++; mutex_exit(&sfh->sfh_lock); nfs_rw_exit(&mi->mi_fh_lock); /* free our speculative allocs */ kmem_free(nsfh->sfh_fh.nfs_fh4_val, NFS4_FHSIZE); kmem_free(nsfh, sizeof (nfs4_sharedfh_t)); return (sfh); } avl_insert(&mi->mi_filehandles, nsfh, where); nfs_rw_exit(&mi->mi_fh_lock); return (nsfh); } /* * Return a shared filehandle object for the given filehandle. The caller * is responsible for eventually calling sfh4_rele(). */ nfs4_sharedfh_t * sfh4_get(const nfs_fh4 *fh, mntinfo4_t *mi) { nfs4_sharedfh_t *sfh; nfs4_sharedfh_t key; ASSERT(fh->nfs_fh4_len <= NFS4_FHSIZE); #ifdef DEBUG if (nfs4_sharedfh_debug) { nfs4_fhandle_t fhandle; fhandle.fh_len = fh->nfs_fh4_len; bcopy(fh->nfs_fh4_val, fhandle.fh_buf, fhandle.fh_len); zcmn_err(mi->mi_zone->zone_id, CE_NOTE, "sfh4_get:"); nfs4_printfhandle(&fhandle); } #endif /* * If there's already an object for the given filehandle, bump the * reference count and return it. Otherwise, create a new object * and add it to the AVL tree. */ key.sfh_fh = *fh; (void) nfs_rw_enter_sig(&mi->mi_fh_lock, RW_READER, 0); sfh = avl_find(&mi->mi_filehandles, &key, NULL); if (sfh != NULL) { mutex_enter(&sfh->sfh_lock); sfh->sfh_refcnt++; NFS4_DEBUG(nfs4_sharedfh_debug, (CE_NOTE, "sfh4_get: found existing %p, new refcnt=%d", (void *)sfh, sfh->sfh_refcnt)); mutex_exit(&sfh->sfh_lock); nfs_rw_exit(&mi->mi_fh_lock); return (sfh); } nfs_rw_exit(&mi->mi_fh_lock); return (sfh4_put(fh, mi, &key)); } /* * Get a reference to the given shared filehandle object. */ void sfh4_hold(nfs4_sharedfh_t *sfh) { ASSERT(sfh->sfh_refcnt > 0); mutex_enter(&sfh->sfh_lock); sfh->sfh_refcnt++; NFS4_DEBUG(nfs4_sharedfh_debug, (CE_NOTE, "sfh4_hold %p, new refcnt=%d", (void *)sfh, sfh->sfh_refcnt)); mutex_exit(&sfh->sfh_lock); } /* * Release a reference to the given shared filehandle object and null out * the given pointer. */ void sfh4_rele(nfs4_sharedfh_t **sfhpp) { mntinfo4_t *mi; nfs4_sharedfh_t *sfh = *sfhpp; ASSERT(sfh->sfh_refcnt > 0); mutex_enter(&sfh->sfh_lock); if (sfh->sfh_refcnt > 1) { sfh->sfh_refcnt--; NFS4_DEBUG(nfs4_sharedfh_debug, (CE_NOTE, "sfh4_rele %p, new refcnt=%d", (void *)sfh, sfh->sfh_refcnt)); mutex_exit(&sfh->sfh_lock); goto finish; } mutex_exit(&sfh->sfh_lock); /* * Possibly the last reference, so get the lock for the table in * case it's time to remove the object from the table. */ mi = sfh->sfh_mi; (void) nfs_rw_enter_sig(&mi->mi_fh_lock, RW_WRITER, 0); mutex_enter(&sfh->sfh_lock); sfh->sfh_refcnt--; if (sfh->sfh_refcnt > 0) { NFS4_DEBUG(nfs4_sharedfh_debug, (CE_NOTE, "sfh4_rele %p, new refcnt=%d", (void *)sfh, sfh->sfh_refcnt)); mutex_exit(&sfh->sfh_lock); nfs_rw_exit(&mi->mi_fh_lock); goto finish; } NFS4_DEBUG(nfs4_sharedfh_debug, (CE_NOTE, "sfh4_rele %p, last ref", (void *)sfh)); if (sfh->sfh_flags & SFH4_IN_TREE) { avl_remove(&mi->mi_filehandles, sfh); sfh->sfh_flags &= ~SFH4_IN_TREE; } mutex_exit(&sfh->sfh_lock); nfs_rw_exit(&mi->mi_fh_lock); mutex_destroy(&sfh->sfh_lock); kmem_free(sfh->sfh_fh.nfs_fh4_val, NFS4_FHSIZE); kmem_free(sfh, sizeof (nfs4_sharedfh_t)); finish: *sfhpp = NULL; } /* * Update the filehandle for the given shared filehandle object. */ int nfs4_warn_dupfh = 0; /* if set, always warn about dup fhs below */ void sfh4_update(nfs4_sharedfh_t *sfh, const nfs_fh4 *newfh) { mntinfo4_t *mi = sfh->sfh_mi; nfs4_sharedfh_t *dupsfh; avl_index_t where; nfs4_sharedfh_t key; #ifdef DEBUG mutex_enter(&sfh->sfh_lock); ASSERT(sfh->sfh_refcnt > 0); mutex_exit(&sfh->sfh_lock); #endif ASSERT(newfh->nfs_fh4_len <= NFS4_FHSIZE); /* * The basic plan is to remove the shared filehandle object from * the table, update it to have the new filehandle, then reinsert * it. */ (void) nfs_rw_enter_sig(&mi->mi_fh_lock, RW_WRITER, 0); mutex_enter(&sfh->sfh_lock); if (sfh->sfh_flags & SFH4_IN_TREE) { avl_remove(&mi->mi_filehandles, sfh); sfh->sfh_flags &= ~SFH4_IN_TREE; } mutex_exit(&sfh->sfh_lock); sfh->sfh_fh.nfs_fh4_len = newfh->nfs_fh4_len; bcopy(newfh->nfs_fh4_val, sfh->sfh_fh.nfs_fh4_val, sfh->sfh_fh.nfs_fh4_len); /* * XXX If there is already a shared filehandle object with the new * filehandle, we're in trouble, because the rnode code assumes * that there is only one shared filehandle object for a given * filehandle. So issue a warning (for read-write mounts only) * and don't try to re-insert the given object into the table. * Hopefully the given object will quickly go away and everyone * will use the new object. */ key.sfh_fh = *newfh; dupsfh = avl_find(&mi->mi_filehandles, &key, &where); if (dupsfh != NULL) { if (!(mi->mi_vfsp->vfs_flag & VFS_RDONLY) || nfs4_warn_dupfh) { zcmn_err(mi->mi_zone->zone_id, CE_WARN, "sfh4_update: " "duplicate filehandle detected"); sfh4_printfhandle(dupsfh); } } else { avl_insert(&mi->mi_filehandles, sfh, where); mutex_enter(&sfh->sfh_lock); sfh->sfh_flags |= SFH4_IN_TREE; mutex_exit(&sfh->sfh_lock); } nfs_rw_exit(&mi->mi_fh_lock); } /* * Copy out the current filehandle for the given shared filehandle object. */ void sfh4_copyval(const nfs4_sharedfh_t *sfh, nfs4_fhandle_t *fhp) { mntinfo4_t *mi = sfh->sfh_mi; ASSERT(sfh->sfh_refcnt > 0); (void) nfs_rw_enter_sig(&mi->mi_fh_lock, RW_READER, 0); fhp->fh_len = sfh->sfh_fh.nfs_fh4_len; ASSERT(fhp->fh_len <= NFS4_FHSIZE); bcopy(sfh->sfh_fh.nfs_fh4_val, fhp->fh_buf, fhp->fh_len); nfs_rw_exit(&mi->mi_fh_lock); } /* * Print out the filehandle for the given shared filehandle object. */ void sfh4_printfhandle(const nfs4_sharedfh_t *sfh) { nfs4_fhandle_t fhandle; sfh4_copyval(sfh, &fhandle); nfs4_printfhandle(&fhandle); } /* * Compare 2 fnames. Returns -1 if the first is "less" than the second, 0 * if they're the same, +1 if the first is "greater" than the second. The * caller (or whoever's calling the AVL package) is responsible for * handling locking issues. */ static int fncmp(const void *p1, const void *p2) { const nfs4_fname_t *f1 = p1; const nfs4_fname_t *f2 = p2; int res; res = strcmp(f1->fn_name, f2->fn_name); /* * The AVL package wants +/-1, not arbitrary positive or negative * integers. */ if (res > 0) res = 1; else if (res < 0) res = -1; return (res); } /* * Get or create an fname with the given name, as a child of the given * fname. The caller is responsible for eventually releasing the reference * (fn_rele()). parent may be NULL. */ nfs4_fname_t * fn_get(nfs4_fname_t *parent, char *name, nfs4_sharedfh_t *sfh) { nfs4_fname_t key; nfs4_fname_t *fnp; avl_index_t where; key.fn_name = name; /* * If there's already an fname registered with the given name, bump * its reference count and return it. Otherwise, create a new one * and add it to the parent's AVL tree. * * fname entries we are looking for should match both name * and sfh stored in the fname. */ again: if (parent != NULL) { mutex_enter(&parent->fn_lock); fnp = avl_find(&parent->fn_children, &key, &where); if (fnp != NULL) { /* * This hold on fnp is released below later, * in case this is not the fnp we want. */ fn_hold(fnp); if (fnp->fn_sfh == sfh) { /* * We have found our entry. * put an hold and return it. */ mutex_exit(&parent->fn_lock); return (fnp); } /* * We have found an entry that has a mismatching * fn_sfh. This could be a stale entry due to * server side rename. We will remove this entry * and make sure no such entries exist. */ mutex_exit(&parent->fn_lock); mutex_enter(&fnp->fn_lock); if (fnp->fn_parent == parent) { /* * Remove ourselves from parent's * fn_children tree. */ mutex_enter(&parent->fn_lock); avl_remove(&parent->fn_children, fnp); mutex_exit(&parent->fn_lock); fn_rele(&fnp->fn_parent); } mutex_exit(&fnp->fn_lock); fn_rele(&fnp); goto again; } } fnp = kmem_alloc(sizeof (nfs4_fname_t), KM_SLEEP); mutex_init(&fnp->fn_lock, NULL, MUTEX_DEFAULT, NULL); fnp->fn_parent = parent; if (parent != NULL) fn_hold(parent); fnp->fn_len = strlen(name); ASSERT(fnp->fn_len < MAXNAMELEN); fnp->fn_name = kmem_alloc(fnp->fn_len + 1, KM_SLEEP); (void) strcpy(fnp->fn_name, name); fnp->fn_refcnt = 1; /* * This hold on sfh is later released * when we do the final fn_rele() on this fname. */ sfh4_hold(sfh); fnp->fn_sfh = sfh; avl_create(&fnp->fn_children, fncmp, sizeof (nfs4_fname_t), offsetof(nfs4_fname_t, fn_tree)); NFS4_DEBUG(nfs4_fname_debug, (CE_NOTE, "fn_get %p:%s, a new nfs4_fname_t!", (void *)fnp, fnp->fn_name)); if (parent != NULL) { avl_insert(&parent->fn_children, fnp, where); mutex_exit(&parent->fn_lock); } return (fnp); } void fn_hold(nfs4_fname_t *fnp) { atomic_inc_32(&fnp->fn_refcnt); NFS4_DEBUG(nfs4_fname_debug, (CE_NOTE, "fn_hold %p:%s, new refcnt=%d", (void *)fnp, fnp->fn_name, fnp->fn_refcnt)); } /* * Decrement the reference count of the given fname, and destroy it if its * reference count goes to zero. Nulls out the given pointer. */ void fn_rele(nfs4_fname_t **fnpp) { nfs4_fname_t *parent; uint32_t newref; nfs4_fname_t *fnp; recur: fnp = *fnpp; *fnpp = NULL; mutex_enter(&fnp->fn_lock); parent = fnp->fn_parent; if (parent != NULL) mutex_enter(&parent->fn_lock); /* prevent new references */ newref = atomic_dec_32_nv(&fnp->fn_refcnt); if (newref > 0) { NFS4_DEBUG(nfs4_fname_debug, (CE_NOTE, "fn_rele %p:%s, new refcnt=%d", (void *)fnp, fnp->fn_name, fnp->fn_refcnt)); if (parent != NULL) mutex_exit(&parent->fn_lock); mutex_exit(&fnp->fn_lock); return; } NFS4_DEBUG(nfs4_fname_debug, (CE_NOTE, "fn_rele %p:%s, last reference, deleting...", (void *)fnp, fnp->fn_name)); if (parent != NULL) { avl_remove(&parent->fn_children, fnp); mutex_exit(&parent->fn_lock); } kmem_free(fnp->fn_name, fnp->fn_len + 1); sfh4_rele(&fnp->fn_sfh); mutex_destroy(&fnp->fn_lock); avl_destroy(&fnp->fn_children); kmem_free(fnp, sizeof (nfs4_fname_t)); /* * Recursivly fn_rele the parent. * Use goto instead of a recursive call to avoid stack overflow. */ if (parent != NULL) { fnpp = &parent; goto recur; } } /* * Returns the single component name of the given fname, in a MAXNAMELEN * string buffer, which the caller is responsible for freeing. Note that * the name may become invalid as a result of fn_move(). */ char * fn_name(nfs4_fname_t *fnp) { char *name; ASSERT(fnp->fn_len < MAXNAMELEN); name = kmem_alloc(MAXNAMELEN, KM_SLEEP); mutex_enter(&fnp->fn_lock); (void) strcpy(name, fnp->fn_name); mutex_exit(&fnp->fn_lock); return (name); } /* * fn_path_realloc * * This function, used only by fn_path, constructs * a new string which looks like "prepend" + "/" + "current". * by allocating a new string and freeing the old one. */ static void fn_path_realloc(char **curses, char *prepend) { int len, curlen = 0; char *news; if (*curses == NULL) { /* * Prime the pump, allocate just the * space for prepend and return that. */ len = strlen(prepend) + 1; news = kmem_alloc(len, KM_SLEEP); (void) strncpy(news, prepend, len); } else { /* * Allocate the space for a new string * +1 +1 is for the "/" and the NULL * byte at the end of it all. */ curlen = strlen(*curses); len = curlen + strlen(prepend) + 1 + 1; news = kmem_alloc(len, KM_SLEEP); (void) strncpy(news, prepend, len); (void) strcat(news, "/"); (void) strcat(news, *curses); kmem_free(*curses, curlen + 1); } *curses = news; } /* * Returns the path name (starting from the fs root) for the given fname. * The caller is responsible for freeing. Note that the path may be or * become invalid as a result of fn_move(). */ char * fn_path(nfs4_fname_t *fnp) { char *path; nfs4_fname_t *nextfnp; if (fnp == NULL) return (NULL); path = NULL; /* walk up the tree constructing the pathname. */ fn_hold(fnp); /* adjust for later rele */ do { mutex_enter(&fnp->fn_lock); /* * Add fn_name in front of the current path */ fn_path_realloc(&path, fnp->fn_name); nextfnp = fnp->fn_parent; if (nextfnp != NULL) fn_hold(nextfnp); mutex_exit(&fnp->fn_lock); fn_rele(&fnp); fnp = nextfnp; } while (fnp != NULL); return (path); } /* * Return a reference to the parent of the given fname, which the caller is * responsible for eventually releasing. */ nfs4_fname_t * fn_parent(nfs4_fname_t *fnp) { nfs4_fname_t *parent; mutex_enter(&fnp->fn_lock); parent = fnp->fn_parent; if (parent != NULL) fn_hold(parent); mutex_exit(&fnp->fn_lock); return (parent); } /* * Update fnp so that its parent is newparent and its name is newname. */ void fn_move(nfs4_fname_t *fnp, nfs4_fname_t *newparent, char *newname) { nfs4_fname_t *parent, *tmpfnp; ssize_t newlen; nfs4_fname_t key; avl_index_t where; /* * This assert exists to catch the client trying to rename * a dir to be a child of itself. This happened at a recent * bakeoff against a 3rd party (broken) server which allowed * the rename to succeed. If it trips it means that: * a) the code in nfs4rename that detects this case is broken * b) the server is broken (since it allowed the bogus rename) * * For non-DEBUG kernels, prepare for a recursive mutex_enter * panic below from: mutex_enter(&newparent->fn_lock); */ ASSERT(fnp != newparent); /* * Remove fnp from its current parent, change its name, then add it * to newparent. It might happen that fnp was replaced by another * nfs4_fname_t with the same fn_name in parent->fn_children. * In such case, fnp->fn_parent is NULL and we skip the removal * of fnp from its current parent. */ mutex_enter(&fnp->fn_lock); parent = fnp->fn_parent; if (parent != NULL) { mutex_enter(&parent->fn_lock); avl_remove(&parent->fn_children, fnp); mutex_exit(&parent->fn_lock); fn_rele(&fnp->fn_parent); } newlen = strlen(newname); if (newlen != fnp->fn_len) { ASSERT(newlen < MAXNAMELEN); kmem_free(fnp->fn_name, fnp->fn_len + 1); fnp->fn_name = kmem_alloc(newlen + 1, KM_SLEEP); fnp->fn_len = newlen; } (void) strcpy(fnp->fn_name, newname); again: mutex_enter(&newparent->fn_lock); key.fn_name = fnp->fn_name; tmpfnp = avl_find(&newparent->fn_children, &key, &where); if (tmpfnp != NULL) { /* * This could be due to a file that was unlinked while * open, or perhaps the rnode is in the free list. Remove * it from newparent and let it go away on its own. The * contorted code is to deal with lock order issues and * race conditions. */ fn_hold(tmpfnp); mutex_exit(&newparent->fn_lock); mutex_enter(&tmpfnp->fn_lock); if (tmpfnp->fn_parent == newparent) { mutex_enter(&newparent->fn_lock); avl_remove(&newparent->fn_children, tmpfnp); mutex_exit(&newparent->fn_lock); fn_rele(&tmpfnp->fn_parent); } mutex_exit(&tmpfnp->fn_lock); fn_rele(&tmpfnp); goto again; } fnp->fn_parent = newparent; fn_hold(newparent); avl_insert(&newparent->fn_children, fnp, where); mutex_exit(&newparent->fn_lock); mutex_exit(&fnp->fn_lock); } #ifdef DEBUG /* * Return non-zero if the type information makes sense for the given vnode. * Otherwise panic. */ int nfs4_consistent_type(vnode_t *vp) { rnode4_t *rp = VTOR4(vp); if (nfs4_vtype_debug && vp->v_type != VNON && rp->r_attr.va_type != VNON && vp->v_type != rp->r_attr.va_type) { cmn_err(CE_PANIC, "vnode %p type mismatch; v_type=%d, " "rnode attr type=%d", (void *)vp, vp->v_type, rp->r_attr.va_type); } return (1); } #endif /* DEBUG */