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 1.50 1998/06/10 19:27:56 julian 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 timeval tv; 126 struct buf *nbp; 127 int s, error, passes, skipmeta; 128 daddr_t lbn; 129 130 131 if (vp->v_type == VBLK) { 132 lbn = INT_MAX; 133 } else { 134 struct inode *ip; 135 ip = VTOI(vp); 136 lbn = lblkno(ip->i_fs, (ip->i_size + ip->i_fs->fs_bsize - 1)); 137 } 138 139 /* 140 * Flush all dirty buffers associated with a vnode. 141 */ 142 passes = NIADDR; 143 skipmeta = 0; 144 if (ap->a_waitfor == MNT_WAIT) 145 skipmeta = 1; 146 loop: 147 s = splbio(); 148 loop2: 149 for (bp = vp->v_dirtyblkhd.lh_first; bp; bp = nbp) { 150 nbp = bp->b_vnbufs.le_next; 151 /* 152 * First time through on a synchronous call, 153 * or if it's already scheduled, skip to the next 154 * buffer 155 */ 156 if ((bp->b_flags & B_BUSY) || 157 ((skipmeta == 1) && (bp->b_lblkno < 0))) 158 continue; 159 if ((bp->b_flags & B_DELWRI) == 0) 160 panic("ffs_fsync: not dirty"); 161 /* 162 * If data is outstanding to another vnode, or we were 163 * asked to wait for everything, or it's not a file or BDEV, 164 * start the IO on this buffer immediatly. 165 */ 166 if (((bp->b_vp != vp) || (ap->a_waitfor == MNT_WAIT)) || 167 ((vp->v_type != VREG) && (vp->v_type != VBLK))) { 168 169 /* 170 * Wait for I/O associated with indirect blocks to 171 * complete, since there is no way to quickly wait 172 * for them below. 173 */ 174 if ((bp->b_vp == vp) || (ap->a_waitfor != MNT_WAIT)) { 175 if ((bp->b_flags & B_CLUSTEROK) && 176 ap->a_waitfor != MNT_WAIT) { 177 (void) vfs_bio_awrite(bp); 178 splx(s); 179 } else { 180 bremfree(bp); 181 bp->b_flags |= B_BUSY; 182 splx(s); 183 (void) bawrite(bp); 184 } 185 } else { 186 bremfree(bp); 187 bp->b_flags |= B_BUSY; 188 splx(s); 189 (void) bwrite(bp); 190 } 191 } else if ((vp->v_type == VREG) && (bp->b_lblkno >= lbn)) { 192 /* 193 * If the buffer is for data that has been truncated 194 * off the file, then throw it away. 195 */ 196 bremfree(bp); 197 bp->b_flags |= B_BUSY | B_INVAL | B_NOCACHE; 198 brelse(bp); 199 splx(s); 200 } else { 201 vfs_bio_awrite(bp); 202 splx(s); 203 } 204 goto loop; 205 } 206 /* 207 * If we were asked to do this synchronously, then go back for 208 * another pass, this time doing the metadata. 209 */ 210 if (skipmeta) { 211 skipmeta = 0; 212 goto loop2; /* stay within the splbio() */ 213 } 214 215 if (ap->a_waitfor == MNT_WAIT) { 216 while (vp->v_numoutput) { 217 vp->v_flag |= VBWAIT; 218 (void) tsleep((caddr_t)&vp->v_numoutput, 219 PRIBIO + 4, "ffsfsn", 0); 220 } 221 222 /* 223 * Ensure that any filesystem metatdata associated 224 * with the vnode has been written. 225 */ 226 splx(s); 227 if ((error = softdep_sync_metadata(ap)) != 0) 228 return (error); 229 s = splbio(); 230 231 if (vp->v_dirtyblkhd.lh_first) { 232 /* 233 * Block devices associated with filesystems may 234 * have new I/O requests posted for them even if 235 * the vnode is locked, so no amount of trying will 236 * get them clean. Thus we give block devices a 237 * good effort, then just give up. For all other file 238 * types, go around and try again until it is clean. 239 */ 240 if (passes > 0) { 241 passes -= 1; 242 goto loop2; 243 } 244 #ifdef DIAGNOSTIC 245 if (vp->v_type != VBLK) 246 vprint("ffs_fsync: dirty", vp); 247 #endif 248 } 249 } 250 splx(s); 251 getmicrotime(&tv); 252 if ((error = UFS_UPDATE(vp, &tv, &tv, ap->a_waitfor == MNT_WAIT)) != 0) 253 return (error); 254 if (DOINGSOFTDEP(vp) && ap->a_waitfor == MNT_WAIT) 255 error = softdep_fsync(vp); 256 return (error); 257 } 258