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 * $Id: ffs_vnops.c,v 1.56 1999/05/14 01:26:05 mckusick Exp $ 35 */ 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/resourcevar.h> 40 #include <sys/signalvar.h> 41 #include <sys/kernel.h> 42 #include <sys/stat.h> 43 #include <sys/buf.h> 44 #include <sys/proc.h> 45 #include <sys/mount.h> 46 #include <sys/vnode.h> 47 48 #include <machine/limits.h> 49 50 #include <vm/vm.h> 51 #include <vm/vm_prot.h> 52 #include <vm/vm_page.h> 53 #include <vm/vm_object.h> 54 #include <vm/vm_extern.h> 55 56 #include <ufs/ufs/quota.h> 57 #include <ufs/ufs/inode.h> 58 #include <ufs/ufs/ufsmount.h> 59 #include <ufs/ufs/ufs_extern.h> 60 61 #include <ufs/ffs/fs.h> 62 #include <ufs/ffs/ffs_extern.h> 63 64 #include <miscfs/specfs/specdev.h> 65 66 static int ffs_fsync __P((struct vop_fsync_args *)); 67 static int ffs_getpages __P((struct vop_getpages_args *)); 68 static int ffs_putpages __P((struct vop_putpages_args *)); 69 static int ffs_read __P((struct vop_read_args *)); 70 static int ffs_write __P((struct vop_write_args *)); 71 72 /* Global vfs data structures for ufs. */ 73 vop_t **ffs_vnodeop_p; 74 static struct vnodeopv_entry_desc ffs_vnodeop_entries[] = { 75 { &vop_default_desc, (vop_t *) ufs_vnoperate }, 76 { &vop_fsync_desc, (vop_t *) ffs_fsync }, 77 { &vop_getpages_desc, (vop_t *) ffs_getpages }, 78 { &vop_putpages_desc, (vop_t *) ffs_putpages }, 79 { &vop_read_desc, (vop_t *) ffs_read }, 80 { &vop_balloc_desc, (vop_t *) ffs_balloc }, 81 { &vop_reallocblks_desc, (vop_t *) ffs_reallocblks }, 82 { &vop_write_desc, (vop_t *) ffs_write }, 83 { NULL, NULL } 84 }; 85 static struct vnodeopv_desc ffs_vnodeop_opv_desc = 86 { &ffs_vnodeop_p, ffs_vnodeop_entries }; 87 88 vop_t **ffs_specop_p; 89 static struct vnodeopv_entry_desc ffs_specop_entries[] = { 90 { &vop_default_desc, (vop_t *) ufs_vnoperatespec }, 91 { &vop_fsync_desc, (vop_t *) ffs_fsync }, 92 { NULL, NULL } 93 }; 94 static struct vnodeopv_desc ffs_specop_opv_desc = 95 { &ffs_specop_p, ffs_specop_entries }; 96 97 vop_t **ffs_fifoop_p; 98 static struct vnodeopv_entry_desc ffs_fifoop_entries[] = { 99 { &vop_default_desc, (vop_t *) ufs_vnoperatefifo }, 100 { &vop_fsync_desc, (vop_t *) ffs_fsync }, 101 { NULL, NULL } 102 }; 103 static struct vnodeopv_desc ffs_fifoop_opv_desc = 104 { &ffs_fifoop_p, ffs_fifoop_entries }; 105 106 VNODEOP_SET(ffs_vnodeop_opv_desc); 107 VNODEOP_SET(ffs_specop_opv_desc); 108 VNODEOP_SET(ffs_fifoop_opv_desc); 109 110 #include <ufs/ufs/ufs_readwrite.c> 111 112 /* 113 * Synch an open file. 114 */ 115 /* ARGSUSED */ 116 static int 117 ffs_fsync(ap) 118 struct vop_fsync_args /* { 119 struct vnode *a_vp; 120 struct ucred *a_cred; 121 int a_waitfor; 122 struct proc *a_p; 123 } */ *ap; 124 { 125 struct vnode *vp = ap->a_vp; 126 struct buf *bp; 127 struct buf *nbp; 128 int s, error, passes, skipmeta; 129 daddr_t lbn; 130 131 132 if (vp->v_type == VBLK) { 133 lbn = INT_MAX; 134 if (vp->v_specmountpoint != NULL && 135 (vp->v_specmountpoint->mnt_flag & MNT_SOFTDEP)) 136 softdep_fsync_mountdev(vp); 137 } else { 138 struct inode *ip; 139 ip = VTOI(vp); 140 lbn = lblkno(ip->i_fs, (ip->i_size + ip->i_fs->fs_bsize - 1)); 141 } 142 143 /* 144 * Flush all dirty buffers associated with a vnode. 145 */ 146 passes = NIADDR + 1; 147 skipmeta = 0; 148 if (ap->a_waitfor == MNT_WAIT) 149 skipmeta = 1; 150 s = splbio(); 151 loop: 152 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; 153 bp = TAILQ_NEXT(bp, b_vnbufs)) 154 bp->b_flags &= ~B_SCANNED; 155 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { 156 nbp = TAILQ_NEXT(bp, b_vnbufs); 157 /* 158 * First time through on a synchronous call, 159 * or if it's already scheduled, skip to the next 160 * buffer 161 */ 162 if ((bp->b_flags & (B_BUSY | B_SCANNED)) || 163 ((skipmeta == 1) && (bp->b_lblkno < 0))) 164 continue; 165 if ((bp->b_flags & B_DELWRI) == 0) 166 panic("ffs_fsync: not dirty"); 167 /* 168 * If data is outstanding to another vnode, or we were 169 * asked to wait for everything, or it's not a file or BDEV, 170 * start the IO on this buffer immediatly. 171 */ 172 bp->b_flags |= B_SCANNED; 173 if (((bp->b_vp != vp) || (ap->a_waitfor == MNT_WAIT)) || 174 ((vp->v_type != VREG) && (vp->v_type != VBLK))) { 175 176 /* 177 * On our final pass through, do all I/O synchronously 178 * so that we can find out if our flush is failing 179 * because of write errors. 180 */ 181 if (passes > 0 || (ap->a_waitfor != MNT_WAIT)) { 182 if ((bp->b_flags & B_CLUSTEROK) && 183 ap->a_waitfor != MNT_WAIT) { 184 (void) vfs_bio_awrite(bp); 185 } else { 186 bremfree(bp); 187 bp->b_flags |= B_BUSY; 188 splx(s); 189 (void) bawrite(bp); 190 s = splbio(); 191 } 192 } else { 193 bremfree(bp); 194 bp->b_flags |= B_BUSY; 195 splx(s); 196 if ((error = bwrite(bp)) != 0) 197 return (error); 198 s = splbio(); 199 } 200 } else if ((vp->v_type == VREG) && (bp->b_lblkno >= lbn)) { 201 /* 202 * If the buffer is for data that has been truncated 203 * off the file, then throw it away. 204 */ 205 bremfree(bp); 206 bp->b_flags |= B_BUSY | B_INVAL | B_NOCACHE; 207 splx(s); 208 brelse(bp); 209 s = splbio(); 210 } else { 211 vfs_bio_awrite(bp); 212 } 213 /* 214 * Since we may have slept during the I/O, we need 215 * to start from a known point. 216 */ 217 nbp = TAILQ_FIRST(&vp->v_dirtyblkhd); 218 } 219 /* 220 * If we were asked to do this synchronously, then go back for 221 * another pass, this time doing the metadata. 222 */ 223 if (skipmeta) { 224 skipmeta = 0; 225 goto loop; 226 } 227 228 if (ap->a_waitfor == MNT_WAIT) { 229 while (vp->v_numoutput) { 230 vp->v_flag |= VBWAIT; 231 (void) tsleep((caddr_t)&vp->v_numoutput, 232 PRIBIO + 4, "ffsfsn", 0); 233 } 234 235 /* 236 * Ensure that any filesystem metatdata associated 237 * with the vnode has been written. 238 */ 239 splx(s); 240 if ((error = softdep_sync_metadata(ap)) != 0) 241 return (error); 242 s = splbio(); 243 244 if (!TAILQ_EMPTY(&vp->v_dirtyblkhd)) { 245 /* 246 * Block devices associated with filesystems may 247 * have new I/O requests posted for them even if 248 * the vnode is locked, so no amount of trying will 249 * get them clean. Thus we give block devices a 250 * good effort, then just give up. For all other file 251 * types, go around and try again until it is clean. 252 */ 253 if (passes > 0) { 254 passes -= 1; 255 goto loop; 256 } 257 #ifdef DIAGNOSTIC 258 if (vp->v_type != VBLK) 259 vprint("ffs_fsync: dirty", vp); 260 #endif 261 } 262 } 263 splx(s); 264 return (UFS_UPDATE(vp, ap->a_waitfor == MNT_WAIT)); 265 } 266