1 /* 2 * Copyright (c) 1982, 1986, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)ffs_vnops.c 8.15 (Berkeley) 5/14/95 34 * $FreeBSD: src/sys/ufs/ffs/ffs_vnops.c,v 1.64 2000/01/10 12:04:25 phk Exp $ 35 * $DragonFly: src/sys/vfs/ufs/ffs_vnops.c,v 1.2 2003/06/17 04:28:59 dillon Exp $ 36 */ 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/resourcevar.h> 41 #include <sys/signalvar.h> 42 #include <sys/kernel.h> 43 #include <sys/stat.h> 44 #include <sys/buf.h> 45 #include <sys/proc.h> 46 #include <sys/mount.h> 47 #include <sys/vnode.h> 48 #include <sys/conf.h> 49 50 #include <machine/limits.h> 51 52 #include <vm/vm.h> 53 #include <vm/vm_page.h> 54 #include <vm/vm_object.h> 55 #include <vm/vm_extern.h> 56 57 #include <ufs/ufs/quota.h> 58 #include <ufs/ufs/inode.h> 59 #include <ufs/ufs/ufsmount.h> 60 #include <ufs/ufs/ufs_extern.h> 61 62 #include <ufs/ffs/fs.h> 63 #include <ufs/ffs/ffs_extern.h> 64 65 static int ffs_fsync __P((struct vop_fsync_args *)); 66 static int ffs_getpages __P((struct vop_getpages_args *)); 67 static int ffs_putpages __P((struct vop_putpages_args *)); 68 static int ffs_read __P((struct vop_read_args *)); 69 static int ffs_write __P((struct vop_write_args *)); 70 71 /* Global vfs data structures for ufs. */ 72 vop_t **ffs_vnodeop_p; 73 static struct vnodeopv_entry_desc ffs_vnodeop_entries[] = { 74 { &vop_default_desc, (vop_t *) ufs_vnoperate }, 75 { &vop_fsync_desc, (vop_t *) ffs_fsync }, 76 { &vop_getpages_desc, (vop_t *) ffs_getpages }, 77 { &vop_putpages_desc, (vop_t *) ffs_putpages }, 78 { &vop_read_desc, (vop_t *) ffs_read }, 79 { &vop_balloc_desc, (vop_t *) ffs_balloc }, 80 { &vop_reallocblks_desc, (vop_t *) ffs_reallocblks }, 81 { &vop_write_desc, (vop_t *) ffs_write }, 82 { NULL, NULL } 83 }; 84 static struct vnodeopv_desc ffs_vnodeop_opv_desc = 85 { &ffs_vnodeop_p, ffs_vnodeop_entries }; 86 87 vop_t **ffs_specop_p; 88 static struct vnodeopv_entry_desc ffs_specop_entries[] = { 89 { &vop_default_desc, (vop_t *) ufs_vnoperatespec }, 90 { &vop_fsync_desc, (vop_t *) ffs_fsync }, 91 { NULL, NULL } 92 }; 93 static struct vnodeopv_desc ffs_specop_opv_desc = 94 { &ffs_specop_p, ffs_specop_entries }; 95 96 vop_t **ffs_fifoop_p; 97 static struct vnodeopv_entry_desc ffs_fifoop_entries[] = { 98 { &vop_default_desc, (vop_t *) ufs_vnoperatefifo }, 99 { &vop_fsync_desc, (vop_t *) ffs_fsync }, 100 { NULL, NULL } 101 }; 102 static struct vnodeopv_desc ffs_fifoop_opv_desc = 103 { &ffs_fifoop_p, ffs_fifoop_entries }; 104 105 VNODEOP_SET(ffs_vnodeop_opv_desc); 106 VNODEOP_SET(ffs_specop_opv_desc); 107 VNODEOP_SET(ffs_fifoop_opv_desc); 108 109 #include <ufs/ufs/ufs_readwrite.c> 110 111 /* 112 * Synch an open file. 113 */ 114 /* ARGSUSED */ 115 static int 116 ffs_fsync(ap) 117 struct vop_fsync_args /* { 118 struct vnode *a_vp; 119 struct ucred *a_cred; 120 int a_waitfor; 121 struct proc *a_p; 122 } */ *ap; 123 { 124 struct vnode *vp = ap->a_vp; 125 struct buf *bp; 126 struct buf *nbp; 127 int s, error, wait, passes, skipmeta; 128 daddr_t lbn; 129 130 wait = (ap->a_waitfor == MNT_WAIT); 131 if (vn_isdisk(vp, NULL)) { 132 lbn = INT_MAX; 133 if (vp->v_specmountpoint != NULL && 134 (vp->v_specmountpoint->mnt_flag & MNT_SOFTDEP)) 135 softdep_fsync_mountdev(vp); 136 } else { 137 struct inode *ip; 138 ip = VTOI(vp); 139 lbn = lblkno(ip->i_fs, (ip->i_size + ip->i_fs->fs_bsize - 1)); 140 } 141 142 /* 143 * Flush all dirty buffers associated with a vnode. 144 */ 145 passes = NIADDR + 1; 146 skipmeta = 0; 147 if (wait) 148 skipmeta = 1; 149 s = splbio(); 150 loop: 151 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; 152 bp = TAILQ_NEXT(bp, b_vnbufs)) 153 bp->b_flags &= ~B_SCANNED; 154 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { 155 nbp = TAILQ_NEXT(bp, b_vnbufs); 156 /* 157 * Reasons to skip this buffer: it has already been considered 158 * on this pass, this pass is the first time through on a 159 * synchronous flush request and the buffer being considered 160 * is metadata, the buffer has dependencies that will cause 161 * it to be redirtied and it has not already been deferred, 162 * or it is already being written. 163 */ 164 if ((bp->b_flags & B_SCANNED) != 0) 165 continue; 166 bp->b_flags |= B_SCANNED; 167 if ((skipmeta == 1 && bp->b_lblkno < 0)) 168 continue; 169 if (!wait && LIST_FIRST(&bp->b_dep) != NULL && 170 (bp->b_flags & B_DEFERRED) == 0 && 171 bioops.io_countdeps && (*bioops.io_countdeps)(bp, 0)) { 172 bp->b_flags |= B_DEFERRED; 173 continue; 174 } 175 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) 176 continue; 177 if ((bp->b_flags & B_DELWRI) == 0) 178 panic("ffs_fsync: not dirty"); 179 if (vp != bp->b_vp) 180 panic("ffs_fsync: vp != vp->b_vp"); 181 /* 182 * If this is a synchronous flush request, or it is not a 183 * file or device, start the write on this buffer immediatly. 184 */ 185 if (wait || (vp->v_type != VREG && vp->v_type != VBLK)) { 186 187 /* 188 * On our final pass through, do all I/O synchronously 189 * so that we can find out if our flush is failing 190 * because of write errors. 191 */ 192 if (passes > 0 || !wait) { 193 if ((bp->b_flags & B_CLUSTEROK) && !wait) { 194 BUF_UNLOCK(bp); 195 (void) vfs_bio_awrite(bp); 196 } else { 197 bremfree(bp); 198 splx(s); 199 (void) bawrite(bp); 200 s = splbio(); 201 } 202 } else { 203 bremfree(bp); 204 splx(s); 205 if ((error = bwrite(bp)) != 0) 206 return (error); 207 s = splbio(); 208 } 209 } else if ((vp->v_type == VREG) && (bp->b_lblkno >= lbn)) { 210 /* 211 * If the buffer is for data that has been truncated 212 * off the file, then throw it away. 213 */ 214 bremfree(bp); 215 bp->b_flags |= B_INVAL | B_NOCACHE; 216 splx(s); 217 brelse(bp); 218 s = splbio(); 219 } else { 220 BUF_UNLOCK(bp); 221 vfs_bio_awrite(bp); 222 } 223 /* 224 * Since we may have slept during the I/O, we need 225 * to start from a known point. 226 */ 227 nbp = TAILQ_FIRST(&vp->v_dirtyblkhd); 228 } 229 /* 230 * If we were asked to do this synchronously, then go back for 231 * another pass, this time doing the metadata. 232 */ 233 if (skipmeta) { 234 skipmeta = 0; 235 goto loop; 236 } 237 238 if (wait) { 239 while (vp->v_numoutput) { 240 vp->v_flag |= VBWAIT; 241 (void) tsleep((caddr_t)&vp->v_numoutput, 242 PRIBIO + 4, "ffsfsn", 0); 243 } 244 245 /* 246 * Ensure that any filesystem metatdata associated 247 * with the vnode has been written. 248 */ 249 splx(s); 250 if ((error = softdep_sync_metadata(ap)) != 0) 251 return (error); 252 s = splbio(); 253 254 if (!TAILQ_EMPTY(&vp->v_dirtyblkhd)) { 255 /* 256 * Block devices associated with filesystems may 257 * have new I/O requests posted for them even if 258 * the vnode is locked, so no amount of trying will 259 * get them clean. Thus we give block devices a 260 * good effort, then just give up. For all other file 261 * types, go around and try again until it is clean. 262 */ 263 if (passes > 0) { 264 passes -= 1; 265 goto loop; 266 } 267 #ifdef DIAGNOSTIC 268 if (!vn_isdisk(vp, NULL)) 269 vprint("ffs_fsync: dirty", vp); 270 #endif 271 } 272 } 273 splx(s); 274 return (UFS_UPDATE(vp, wait)); 275 } 276