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 1.53 1998/10/31 15:31:27 peter 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 static int ffs_fsync __P((struct vop_fsync_args *)); 65 static int ffs_getpages __P((struct vop_getpages_args *)); 66 static int ffs_putpages __P((struct vop_putpages_args *)); 67 static int ffs_read __P((struct vop_read_args *)); 68 static int ffs_write __P((struct vop_write_args *)); 69 70 /* Global vfs data structures for ufs. */ 71 vop_t **ffs_vnodeop_p; 72 static struct vnodeopv_entry_desc ffs_vnodeop_entries[] = { 73 { &vop_default_desc, (vop_t *) ufs_vnoperate }, 74 { &vop_fsync_desc, (vop_t *) ffs_fsync }, 75 { &vop_getpages_desc, (vop_t *) ffs_getpages }, 76 { &vop_putpages_desc, (vop_t *) ffs_putpages }, 77 { &vop_read_desc, (vop_t *) ffs_read }, 78 { &vop_balloc_desc, (vop_t *) ffs_balloc }, 79 { &vop_reallocblks_desc, (vop_t *) ffs_reallocblks }, 80 { &vop_write_desc, (vop_t *) ffs_write }, 81 { NULL, NULL } 82 }; 83 static struct vnodeopv_desc ffs_vnodeop_opv_desc = 84 { &ffs_vnodeop_p, ffs_vnodeop_entries }; 85 86 vop_t **ffs_specop_p; 87 static struct vnodeopv_entry_desc ffs_specop_entries[] = { 88 { &vop_default_desc, (vop_t *) ufs_vnoperatespec }, 89 { &vop_fsync_desc, (vop_t *) ffs_fsync }, 90 { NULL, NULL } 91 }; 92 static struct vnodeopv_desc ffs_specop_opv_desc = 93 { &ffs_specop_p, ffs_specop_entries }; 94 95 vop_t **ffs_fifoop_p; 96 static struct vnodeopv_entry_desc ffs_fifoop_entries[] = { 97 { &vop_default_desc, (vop_t *) ufs_vnoperatefifo }, 98 { &vop_fsync_desc, (vop_t *) ffs_fsync }, 99 { NULL, NULL } 100 }; 101 static struct vnodeopv_desc ffs_fifoop_opv_desc = 102 { &ffs_fifoop_p, ffs_fifoop_entries }; 103 104 VNODEOP_SET(ffs_vnodeop_opv_desc); 105 VNODEOP_SET(ffs_specop_opv_desc); 106 VNODEOP_SET(ffs_fifoop_opv_desc); 107 108 #include <ufs/ufs/ufs_readwrite.c> 109 110 /* 111 * Synch an open file. 112 */ 113 /* ARGSUSED */ 114 static int 115 ffs_fsync(ap) 116 struct vop_fsync_args /* { 117 struct vnode *a_vp; 118 struct ucred *a_cred; 119 int a_waitfor; 120 struct proc *a_p; 121 } */ *ap; 122 { 123 struct vnode *vp = ap->a_vp; 124 struct buf *bp; 125 struct buf *nbp; 126 int s, error, passes, skipmeta; 127 daddr_t lbn; 128 129 130 if (vp->v_type == VBLK) { 131 lbn = INT_MAX; 132 } else { 133 struct inode *ip; 134 ip = VTOI(vp); 135 lbn = lblkno(ip->i_fs, (ip->i_size + ip->i_fs->fs_bsize - 1)); 136 } 137 138 /* 139 * Flush all dirty buffers associated with a vnode. 140 */ 141 passes = NIADDR; 142 skipmeta = 0; 143 if (ap->a_waitfor == MNT_WAIT) 144 skipmeta = 1; 145 loop: 146 s = splbio(); 147 loop2: 148 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { 149 nbp = TAILQ_NEXT(bp, b_vnbufs); 150 /* 151 * First time through on a synchronous call, 152 * or if it's already scheduled, skip to the next 153 * buffer 154 */ 155 if ((bp->b_flags & B_BUSY) || 156 ((skipmeta == 1) && (bp->b_lblkno < 0))) 157 continue; 158 if ((bp->b_flags & B_DELWRI) == 0) 159 panic("ffs_fsync: not dirty"); 160 /* 161 * If data is outstanding to another vnode, or we were 162 * asked to wait for everything, or it's not a file or BDEV, 163 * start the IO on this buffer immediatly. 164 */ 165 if (((bp->b_vp != vp) || (ap->a_waitfor == MNT_WAIT)) || 166 ((vp->v_type != VREG) && (vp->v_type != VBLK))) { 167 168 /* 169 * Wait for I/O associated with indirect blocks to 170 * complete, since there is no way to quickly wait 171 * for them below. 172 */ 173 if ((bp->b_vp == vp) || (ap->a_waitfor != MNT_WAIT)) { 174 if ((bp->b_flags & B_CLUSTEROK) && 175 ap->a_waitfor != MNT_WAIT) { 176 (void) vfs_bio_awrite(bp); 177 splx(s); 178 } else { 179 bremfree(bp); 180 bp->b_flags |= B_BUSY; 181 splx(s); 182 (void) bawrite(bp); 183 } 184 } else { 185 bremfree(bp); 186 bp->b_flags |= B_BUSY; 187 splx(s); 188 (void) bwrite(bp); 189 } 190 } else if ((vp->v_type == VREG) && (bp->b_lblkno >= lbn)) { 191 /* 192 * If the buffer is for data that has been truncated 193 * off the file, then throw it away. 194 */ 195 bremfree(bp); 196 bp->b_flags |= B_BUSY | B_INVAL | B_NOCACHE; 197 brelse(bp); 198 splx(s); 199 } else { 200 vfs_bio_awrite(bp); 201 splx(s); 202 } 203 goto loop; 204 } 205 /* 206 * If we were asked to do this synchronously, then go back for 207 * another pass, this time doing the metadata. 208 */ 209 if (skipmeta) { 210 skipmeta = 0; 211 goto loop2; /* stay within the splbio() */ 212 } 213 214 if (ap->a_waitfor == MNT_WAIT) { 215 while (vp->v_numoutput) { 216 vp->v_flag |= VBWAIT; 217 (void) tsleep((caddr_t)&vp->v_numoutput, 218 PRIBIO + 4, "ffsfsn", 0); 219 } 220 221 /* 222 * Ensure that any filesystem metatdata associated 223 * with the vnode has been written. 224 */ 225 splx(s); 226 if ((error = softdep_sync_metadata(ap)) != 0) 227 return (error); 228 s = splbio(); 229 230 if (!TAILQ_EMPTY(&vp->v_dirtyblkhd)) { 231 /* 232 * Block devices associated with filesystems may 233 * have new I/O requests posted for them even if 234 * the vnode is locked, so no amount of trying will 235 * get them clean. Thus we give block devices a 236 * good effort, then just give up. For all other file 237 * types, go around and try again until it is clean. 238 */ 239 if (passes > 0) { 240 passes -= 1; 241 goto loop2; 242 } 243 #ifdef DIAGNOSTIC 244 if (vp->v_type != VBLK) 245 vprint("ffs_fsync: dirty", vp); 246 #endif 247 } 248 } 249 splx(s); 250 return (UFS_UPDATE(vp, ap->a_waitfor == MNT_WAIT)); 251 } 252