nfs_clsubs.c revision 191783
1191783Srmacklem/*- 2191783Srmacklem * Copyright (c) 1989, 1993 3191783Srmacklem * The Regents of the University of California. All rights reserved. 4191783Srmacklem * 5191783Srmacklem * This code is derived from software contributed to Berkeley by 6191783Srmacklem * Rick Macklem at The University of Guelph. 7191783Srmacklem * 8191783Srmacklem * Redistribution and use in source and binary forms, with or without 9191783Srmacklem * modification, are permitted provided that the following conditions 10191783Srmacklem * are met: 11191783Srmacklem * 1. Redistributions of source code must retain the above copyright 12191783Srmacklem * notice, this list of conditions and the following disclaimer. 13191783Srmacklem * 2. Redistributions in binary form must reproduce the above copyright 14191783Srmacklem * notice, this list of conditions and the following disclaimer in the 15191783Srmacklem * documentation and/or other materials provided with the distribution. 16191783Srmacklem * 4. Neither the name of the University nor the names of its contributors 17191783Srmacklem * may be used to endorse or promote products derived from this software 18191783Srmacklem * without specific prior written permission. 19191783Srmacklem * 20191783Srmacklem * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21191783Srmacklem * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22191783Srmacklem * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23191783Srmacklem * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24191783Srmacklem * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25191783Srmacklem * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26191783Srmacklem * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27191783Srmacklem * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28191783Srmacklem * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29191783Srmacklem * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30191783Srmacklem * SUCH DAMAGE. 31191783Srmacklem * 32191783Srmacklem * from nfs_subs.c 8.8 (Berkeley) 5/22/95 33191783Srmacklem */ 34191783Srmacklem 35191783Srmacklem#include <sys/cdefs.h> 36191783Srmacklem__FBSDID("$FreeBSD: head/sys/fs/nfsclient/nfs_clsubs.c 191783 2009-05-04 15:23:58Z rmacklem $"); 37191783Srmacklem 38191783Srmacklem/* 39191783Srmacklem * These functions support the macros and help fiddle mbuf chains for 40191783Srmacklem * the nfs op functions. They do things like create the rpc header and 41191783Srmacklem * copy data between mbuf chains and uio lists. 42191783Srmacklem */ 43191783Srmacklem 44191783Srmacklem#include <sys/param.h> 45191783Srmacklem#include <sys/systm.h> 46191783Srmacklem#include <sys/kernel.h> 47191783Srmacklem#include <sys/bio.h> 48191783Srmacklem#include <sys/buf.h> 49191783Srmacklem#include <sys/proc.h> 50191783Srmacklem#include <sys/mount.h> 51191783Srmacklem#include <sys/vnode.h> 52191783Srmacklem#include <sys/namei.h> 53191783Srmacklem#include <sys/mbuf.h> 54191783Srmacklem#include <sys/socket.h> 55191783Srmacklem#include <sys/stat.h> 56191783Srmacklem#include <sys/malloc.h> 57191783Srmacklem#include <sys/sysent.h> 58191783Srmacklem#include <sys/syscall.h> 59191783Srmacklem#include <sys/sysproto.h> 60191783Srmacklem 61191783Srmacklem#include <vm/vm.h> 62191783Srmacklem#include <vm/vm_object.h> 63191783Srmacklem#include <vm/vm_extern.h> 64191783Srmacklem#include <vm/uma.h> 65191783Srmacklem 66191783Srmacklem#include <fs/nfs/nfsport.h> 67191783Srmacklem#include <fs/nfsclient/nfsnode.h> 68191783Srmacklem#include <fs/nfsclient/nfsmount.h> 69191783Srmacklem#include <fs/nfsclient/nfs.h> 70191783Srmacklem#include <fs/nfsclient/nfs_lock.h> 71191783Srmacklem 72191783Srmacklem#include <netinet/in.h> 73191783Srmacklem 74191783Srmacklem/* 75191783Srmacklem * Note that stdarg.h and the ANSI style va_start macro is used for both 76191783Srmacklem * ANSI and traditional C compilers. 77191783Srmacklem */ 78191783Srmacklem#include <machine/stdarg.h> 79191783Srmacklem 80191783Srmacklemextern struct mtx ncl_iod_mutex; 81191783Srmacklemextern struct proc *ncl_iodwant[NFS_MAXRAHEAD]; 82191783Srmacklemextern struct nfsmount *ncl_iodmount[NFS_MAXRAHEAD]; 83191783Srmacklemextern int ncl_numasync; 84191783Srmacklemextern unsigned int ncl_iodmax; 85191783Srmacklemextern struct nfsstats newnfsstats; 86191783Srmacklem 87191783Srmacklemint 88191783Srmacklemncl_uninit(struct vfsconf *vfsp) 89191783Srmacklem{ 90191783Srmacklem int i; 91191783Srmacklem 92191783Srmacklem /* 93191783Srmacklem * Tell all nfsiod processes to exit. Clear ncl_iodmax, and wakeup 94191783Srmacklem * any sleeping nfsiods so they check ncl_iodmax and exit. 95191783Srmacklem */ 96191783Srmacklem mtx_lock(&ncl_iod_mutex); 97191783Srmacklem ncl_iodmax = 0; 98191783Srmacklem for (i = 0; i < ncl_numasync; i++) 99191783Srmacklem if (ncl_iodwant[i]) 100191783Srmacklem wakeup(&ncl_iodwant[i]); 101191783Srmacklem /* The last nfsiod to exit will wake us up when ncl_numasync hits 0 */ 102191783Srmacklem while (ncl_numasync) 103191783Srmacklem msleep(&ncl_numasync, &ncl_iod_mutex, PWAIT, "ioddie", 0); 104191783Srmacklem mtx_unlock(&ncl_iod_mutex); 105191783Srmacklem ncl_nhuninit(); 106191783Srmacklem return (0); 107191783Srmacklem} 108191783Srmacklem 109191783Srmacklemvoid 110191783Srmacklemncl_dircookie_lock(struct nfsnode *np) 111191783Srmacklem{ 112191783Srmacklem mtx_lock(&np->n_mtx); 113191783Srmacklem while (np->n_flag & NDIRCOOKIELK) 114191783Srmacklem (void) msleep(&np->n_flag, &np->n_mtx, PZERO, "nfsdirlk", 0); 115191783Srmacklem np->n_flag |= NDIRCOOKIELK; 116191783Srmacklem mtx_unlock(&np->n_mtx); 117191783Srmacklem} 118191783Srmacklem 119191783Srmacklemvoid 120191783Srmacklemncl_dircookie_unlock(struct nfsnode *np) 121191783Srmacklem{ 122191783Srmacklem mtx_lock(&np->n_mtx); 123191783Srmacklem np->n_flag &= ~NDIRCOOKIELK; 124191783Srmacklem wakeup(&np->n_flag); 125191783Srmacklem mtx_unlock(&np->n_mtx); 126191783Srmacklem} 127191783Srmacklem 128191783Srmacklemint 129191783Srmacklemncl_upgrade_vnlock(struct vnode *vp) 130191783Srmacklem{ 131191783Srmacklem int old_lock; 132191783Srmacklem 133191783Srmacklem if ((old_lock = VOP_ISLOCKED(vp)) != LK_EXCLUSIVE) { 134191783Srmacklem if (old_lock == LK_SHARED) { 135191783Srmacklem /* Upgrade to exclusive lock, this might block */ 136191783Srmacklem vn_lock(vp, LK_UPGRADE | LK_RETRY); 137191783Srmacklem } else { 138191783Srmacklem vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 139191783Srmacklem } 140191783Srmacklem } 141191783Srmacklem return old_lock; 142191783Srmacklem} 143191783Srmacklem 144191783Srmacklemvoid 145191783Srmacklemncl_downgrade_vnlock(struct vnode *vp, int old_lock) 146191783Srmacklem{ 147191783Srmacklem if (old_lock != LK_EXCLUSIVE) { 148191783Srmacklem if (old_lock == LK_SHARED) { 149191783Srmacklem /* Downgrade from exclusive lock, this might block */ 150191783Srmacklem vn_lock(vp, LK_DOWNGRADE); 151191783Srmacklem } else { 152191783Srmacklem VOP_UNLOCK(vp, 0); 153191783Srmacklem } 154191783Srmacklem } 155191783Srmacklem} 156191783Srmacklem 157191783Srmacklemvoid 158191783Srmacklemncl_printf(const char *fmt, ...) 159191783Srmacklem{ 160191783Srmacklem va_list ap; 161191783Srmacklem 162191783Srmacklem mtx_lock(&Giant); 163191783Srmacklem va_start(ap, fmt); 164191783Srmacklem printf(fmt, ap); 165191783Srmacklem va_end(ap); 166191783Srmacklem mtx_unlock(&Giant); 167191783Srmacklem} 168191783Srmacklem 169191783Srmacklem#ifdef NFS_ACDEBUG 170191783Srmacklem#include <sys/sysctl.h> 171191783SrmacklemSYSCTL_DECL(_vfs_newnfs); 172191783Srmacklemstatic int nfs_acdebug; 173191783SrmacklemSYSCTL_INT(_vfs_newnfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0, ""); 174191783Srmacklem#endif 175191783Srmacklem 176191783Srmacklem/* 177191783Srmacklem * Check the time stamp 178191783Srmacklem * If the cache is valid, copy contents to *vap and return 0 179191783Srmacklem * otherwise return an error 180191783Srmacklem */ 181191783Srmacklemint 182191783Srmacklemncl_getattrcache(struct vnode *vp, struct vattr *vaper) 183191783Srmacklem{ 184191783Srmacklem struct nfsnode *np; 185191783Srmacklem struct vattr *vap; 186191783Srmacklem struct nfsmount *nmp; 187191783Srmacklem int timeo; 188191783Srmacklem 189191783Srmacklem np = VTONFS(vp); 190191783Srmacklem vap = &np->n_vattr.na_vattr; 191191783Srmacklem nmp = VFSTONFS(vp->v_mount); 192191783Srmacklem#ifdef NFS_ACDEBUG 193191783Srmacklem mtx_lock(&Giant); /* ncl_printf() */ 194191783Srmacklem#endif 195191783Srmacklem mtx_lock(&np->n_mtx); 196191783Srmacklem /* XXX n_mtime doesn't seem to be updated on a miss-and-reload */ 197191783Srmacklem timeo = (time_second - np->n_mtime.tv_sec) / 10; 198191783Srmacklem 199191783Srmacklem#ifdef NFS_ACDEBUG 200191783Srmacklem if (nfs_acdebug>1) 201191783Srmacklem ncl_printf("nfs_getattrcache: initial timeo = %d\n", timeo); 202191783Srmacklem#endif 203191783Srmacklem 204191783Srmacklem if (vap->va_type == VDIR) { 205191783Srmacklem if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acdirmin) 206191783Srmacklem timeo = nmp->nm_acdirmin; 207191783Srmacklem else if (timeo > nmp->nm_acdirmax) 208191783Srmacklem timeo = nmp->nm_acdirmax; 209191783Srmacklem } else { 210191783Srmacklem if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acregmin) 211191783Srmacklem timeo = nmp->nm_acregmin; 212191783Srmacklem else if (timeo > nmp->nm_acregmax) 213191783Srmacklem timeo = nmp->nm_acregmax; 214191783Srmacklem } 215191783Srmacklem 216191783Srmacklem#ifdef NFS_ACDEBUG 217191783Srmacklem if (nfs_acdebug > 2) 218191783Srmacklem ncl_printf("acregmin %d; acregmax %d; acdirmin %d; acdirmax %d\n", 219191783Srmacklem nmp->nm_acregmin, nmp->nm_acregmax, 220191783Srmacklem nmp->nm_acdirmin, nmp->nm_acdirmax); 221191783Srmacklem 222191783Srmacklem if (nfs_acdebug) 223191783Srmacklem ncl_printf("nfs_getattrcache: age = %d; final timeo = %d\n", 224191783Srmacklem (time_second - np->n_attrstamp), timeo); 225191783Srmacklem#endif 226191783Srmacklem 227191783Srmacklem if ((time_second - np->n_attrstamp) >= timeo) { 228191783Srmacklem newnfsstats.attrcache_misses++; 229191783Srmacklem mtx_unlock(&np->n_mtx); 230191783Srmacklem return( ENOENT); 231191783Srmacklem } 232191783Srmacklem newnfsstats.attrcache_hits++; 233191783Srmacklem if (vap->va_size != np->n_size) { 234191783Srmacklem if (vap->va_type == VREG) { 235191783Srmacklem if (np->n_flag & NMODIFIED) { 236191783Srmacklem if (vap->va_size < np->n_size) 237191783Srmacklem vap->va_size = np->n_size; 238191783Srmacklem else 239191783Srmacklem np->n_size = vap->va_size; 240191783Srmacklem } else { 241191783Srmacklem np->n_size = vap->va_size; 242191783Srmacklem } 243191783Srmacklem vnode_pager_setsize(vp, np->n_size); 244191783Srmacklem } else { 245191783Srmacklem np->n_size = vap->va_size; 246191783Srmacklem } 247191783Srmacklem } 248191783Srmacklem bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr)); 249191783Srmacklem if (np->n_flag & NCHG) { 250191783Srmacklem if (np->n_flag & NACC) 251191783Srmacklem vaper->va_atime = np->n_atim; 252191783Srmacklem if (np->n_flag & NUPD) 253191783Srmacklem vaper->va_mtime = np->n_mtim; 254191783Srmacklem } 255191783Srmacklem mtx_unlock(&np->n_mtx); 256191783Srmacklem#ifdef NFS_ACDEBUG 257191783Srmacklem mtx_unlock(&Giant); /* ncl_printf() */ 258191783Srmacklem#endif 259191783Srmacklem return (0); 260191783Srmacklem} 261191783Srmacklem 262191783Srmacklemstatic nfsuint64 nfs_nullcookie = { { 0, 0 } }; 263191783Srmacklem/* 264191783Srmacklem * This function finds the directory cookie that corresponds to the 265191783Srmacklem * logical byte offset given. 266191783Srmacklem */ 267191783Srmacklemnfsuint64 * 268191783Srmacklemncl_getcookie(struct nfsnode *np, off_t off, int add) 269191783Srmacklem{ 270191783Srmacklem struct nfsdmap *dp, *dp2; 271191783Srmacklem int pos; 272191783Srmacklem nfsuint64 *retval = NULL; 273191783Srmacklem 274191783Srmacklem pos = (uoff_t)off / NFS_DIRBLKSIZ; 275191783Srmacklem if (pos == 0 || off < 0) { 276191783Srmacklem#ifdef DIAGNOSTIC 277191783Srmacklem if (add) 278191783Srmacklem panic("nfs getcookie add at <= 0"); 279191783Srmacklem#endif 280191783Srmacklem return (&nfs_nullcookie); 281191783Srmacklem } 282191783Srmacklem pos--; 283191783Srmacklem dp = LIST_FIRST(&np->n_cookies); 284191783Srmacklem if (!dp) { 285191783Srmacklem if (add) { 286191783Srmacklem MALLOC(dp, struct nfsdmap *, sizeof (struct nfsdmap), 287191783Srmacklem M_NFSDIROFF, M_WAITOK); 288191783Srmacklem dp->ndm_eocookie = 0; 289191783Srmacklem LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list); 290191783Srmacklem } else 291191783Srmacklem goto out; 292191783Srmacklem } 293191783Srmacklem while (pos >= NFSNUMCOOKIES) { 294191783Srmacklem pos -= NFSNUMCOOKIES; 295191783Srmacklem if (LIST_NEXT(dp, ndm_list)) { 296191783Srmacklem if (!add && dp->ndm_eocookie < NFSNUMCOOKIES && 297191783Srmacklem pos >= dp->ndm_eocookie) 298191783Srmacklem goto out; 299191783Srmacklem dp = LIST_NEXT(dp, ndm_list); 300191783Srmacklem } else if (add) { 301191783Srmacklem MALLOC(dp2, struct nfsdmap *, sizeof (struct nfsdmap), 302191783Srmacklem M_NFSDIROFF, M_WAITOK); 303191783Srmacklem dp2->ndm_eocookie = 0; 304191783Srmacklem LIST_INSERT_AFTER(dp, dp2, ndm_list); 305191783Srmacklem dp = dp2; 306191783Srmacklem } else 307191783Srmacklem goto out; 308191783Srmacklem } 309191783Srmacklem if (pos >= dp->ndm_eocookie) { 310191783Srmacklem if (add) 311191783Srmacklem dp->ndm_eocookie = pos + 1; 312191783Srmacklem else 313191783Srmacklem goto out; 314191783Srmacklem } 315191783Srmacklem retval = &dp->ndm_cookies[pos]; 316191783Srmacklemout: 317191783Srmacklem return (retval); 318191783Srmacklem} 319191783Srmacklem 320191783Srmacklem/* 321191783Srmacklem * Invalidate cached directory information, except for the actual directory 322191783Srmacklem * blocks (which are invalidated separately). 323191783Srmacklem * Done mainly to avoid the use of stale offset cookies. 324191783Srmacklem */ 325191783Srmacklemvoid 326191783Srmacklemncl_invaldir(struct vnode *vp) 327191783Srmacklem{ 328191783Srmacklem struct nfsnode *np = VTONFS(vp); 329191783Srmacklem 330191783Srmacklem#ifdef DIAGNOSTIC 331191783Srmacklem if (vp->v_type != VDIR) 332191783Srmacklem panic("nfs: invaldir not dir"); 333191783Srmacklem#endif 334191783Srmacklem ncl_dircookie_lock(np); 335191783Srmacklem np->n_direofoffset = 0; 336191783Srmacklem np->n_cookieverf.nfsuquad[0] = 0; 337191783Srmacklem np->n_cookieverf.nfsuquad[1] = 0; 338191783Srmacklem if (LIST_FIRST(&np->n_cookies)) 339191783Srmacklem LIST_FIRST(&np->n_cookies)->ndm_eocookie = 0; 340191783Srmacklem ncl_dircookie_unlock(np); 341191783Srmacklem} 342191783Srmacklem 343191783Srmacklem/* 344191783Srmacklem * The write verifier has changed (probably due to a server reboot), so all 345191783Srmacklem * B_NEEDCOMMIT blocks will have to be written again. Since they are on the 346191783Srmacklem * dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT 347191783Srmacklem * and B_CLUSTEROK flags. Once done the new write verifier can be set for the 348191783Srmacklem * mount point. 349191783Srmacklem * 350191783Srmacklem * B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data 351191783Srmacklem * writes are not clusterable. 352191783Srmacklem */ 353191783Srmacklemvoid 354191783Srmacklemncl_clearcommit(struct mount *mp) 355191783Srmacklem{ 356191783Srmacklem struct vnode *vp, *nvp; 357191783Srmacklem struct buf *bp, *nbp; 358191783Srmacklem struct bufobj *bo; 359191783Srmacklem 360191783Srmacklem MNT_ILOCK(mp); 361191783Srmacklem MNT_VNODE_FOREACH(vp, mp, nvp) { 362191783Srmacklem bo = &vp->v_bufobj; 363191783Srmacklem VI_LOCK(vp); 364191783Srmacklem if (vp->v_iflag & VI_DOOMED) { 365191783Srmacklem VI_UNLOCK(vp); 366191783Srmacklem continue; 367191783Srmacklem } 368191783Srmacklem vholdl(vp); 369191783Srmacklem VI_UNLOCK(vp); 370191783Srmacklem MNT_IUNLOCK(mp); 371191783Srmacklem BO_LOCK(bo); 372191783Srmacklem TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 373191783Srmacklem if (!BUF_ISLOCKED(bp) && 374191783Srmacklem (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) 375191783Srmacklem == (B_DELWRI | B_NEEDCOMMIT)) 376191783Srmacklem bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 377191783Srmacklem } 378191783Srmacklem BO_UNLOCK(bo); 379191783Srmacklem vdrop(vp); 380191783Srmacklem MNT_ILOCK(mp); 381191783Srmacklem } 382191783Srmacklem MNT_IUNLOCK(mp); 383191783Srmacklem} 384191783Srmacklem 385191783Srmacklem/* 386191783Srmacklem * Called once to initialize data structures... 387191783Srmacklem */ 388191783Srmacklemint 389191783Srmacklemncl_init(struct vfsconf *vfsp) 390191783Srmacklem{ 391191783Srmacklem int i; 392191783Srmacklem 393191783Srmacklem /* Ensure async daemons disabled */ 394191783Srmacklem for (i = 0; i < NFS_MAXRAHEAD; i++) { 395191783Srmacklem ncl_iodwant[i] = NULL; 396191783Srmacklem ncl_iodmount[i] = NULL; 397191783Srmacklem } 398191783Srmacklem ncl_nhinit(); /* Init the nfsnode table */ 399191783Srmacklem 400191783Srmacklem return (0); 401191783Srmacklem} 402191783Srmacklem 403