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 * $FreeBSD$ 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 #include <sys/conf.h> 48 49 #include <machine/limits.h> 50 51 #include <vm/vm.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, wait, passes, skipmeta; 127 daddr_t lbn; 128 129 wait = (ap->a_waitfor == MNT_WAIT); 130 if (vn_isdisk(vp, NULL)) { 131 lbn = INT_MAX; 132 if (vp->v_specmountpoint != NULL && 133 (vp->v_specmountpoint->mnt_flag & MNT_SOFTDEP)) 134 softdep_fsync_mountdev(vp); 135 } else { 136 struct inode *ip; 137 ip = VTOI(vp); 138 lbn = lblkno(ip->i_fs, (ip->i_size + ip->i_fs->fs_bsize - 1)); 139 } 140 141 /* 142 * Flush all dirty buffers associated with a vnode. 143 */ 144 passes = NIADDR + 1; 145 skipmeta = 0; 146 if (wait) 147 skipmeta = 1; 148 s = splbio(); 149 loop: 150 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; 151 bp = TAILQ_NEXT(bp, b_vnbufs)) 152 bp->b_flags &= ~B_SCANNED; 153 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { 154 nbp = TAILQ_NEXT(bp, b_vnbufs); 155 /* 156 * Reasons to skip this buffer: it has already been considered 157 * on this pass, this pass is the first time through on a 158 * synchronous flush request and the buffer being considered 159 * is metadata, the buffer has dependencies that will cause 160 * it to be redirtied and it has not already been deferred, 161 * or it is already being written. 162 */ 163 if ((bp->b_flags & B_SCANNED) != 0) 164 continue; 165 bp->b_flags |= B_SCANNED; 166 if ((skipmeta == 1 && bp->b_lblkno < 0)) 167 continue; 168 if (!wait && LIST_FIRST(&bp->b_dep) != NULL && 169 (bp->b_flags & B_DEFERRED) == 0 && 170 bioops.io_countdeps && (*bioops.io_countdeps)(bp, 0)) { 171 bp->b_flags |= B_DEFERRED; 172 continue; 173 } 174 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) 175 continue; 176 if ((bp->b_flags & B_DELWRI) == 0) 177 panic("ffs_fsync: not dirty"); 178 if (vp != bp->b_vp) 179 panic("ffs_fsync: vp != vp->b_vp"); 180 /* 181 * If this is a synchronous flush request, or it is not a 182 * file or device, start the write on this buffer immediatly. 183 */ 184 if (wait || (vp->v_type != VREG && vp->v_type != VBLK)) { 185 186 /* 187 * On our final pass through, do all I/O synchronously 188 * so that we can find out if our flush is failing 189 * because of write errors. 190 */ 191 if (passes > 0 || !wait) { 192 if ((bp->b_flags & B_CLUSTEROK) && !wait) { 193 BUF_UNLOCK(bp); 194 (void) vfs_bio_awrite(bp); 195 } else { 196 bremfree(bp); 197 splx(s); 198 (void) bawrite(bp); 199 s = splbio(); 200 } 201 } else { 202 bremfree(bp); 203 splx(s); 204 if ((error = bwrite(bp)) != 0) 205 return (error); 206 s = splbio(); 207 } 208 } else if ((vp->v_type == VREG) && (bp->b_lblkno >= lbn)) { 209 /* 210 * If the buffer is for data that has been truncated 211 * off the file, then throw it away. 212 */ 213 bremfree(bp); 214 bp->b_flags |= B_INVAL | B_NOCACHE; 215 splx(s); 216 brelse(bp); 217 s = splbio(); 218 } else { 219 BUF_UNLOCK(bp); 220 vfs_bio_awrite(bp); 221 } 222 /* 223 * Since we may have slept during the I/O, we need 224 * to start from a known point. 225 */ 226 nbp = TAILQ_FIRST(&vp->v_dirtyblkhd); 227 } 228 /* 229 * If we were asked to do this synchronously, then go back for 230 * another pass, this time doing the metadata. 231 */ 232 if (skipmeta) { 233 skipmeta = 0; 234 goto loop; 235 } 236 237 if (wait) { 238 while (vp->v_numoutput) { 239 vp->v_flag |= VBWAIT; 240 (void) tsleep((caddr_t)&vp->v_numoutput, 241 PRIBIO + 4, "ffsfsn", 0); 242 } 243 244 /* 245 * Ensure that any filesystem metatdata associated 246 * with the vnode has been written. 247 */ 248 splx(s); 249 if ((error = softdep_sync_metadata(ap)) != 0) 250 return (error); 251 s = splbio(); 252 253 if (!TAILQ_EMPTY(&vp->v_dirtyblkhd)) { 254 /* 255 * Block devices associated with filesystems may 256 * have new I/O requests posted for them even if 257 * the vnode is locked, so no amount of trying will 258 * get them clean. Thus we give block devices a 259 * good effort, then just give up. For all other file 260 * types, go around and try again until it is clean. 261 */ 262 if (passes > 0) { 263 passes -= 1; 264 goto loop; 265 } 266 #ifdef DIAGNOSTIC 267 if (!vn_isdisk(vp, NULL)) 268 vprint("ffs_fsync: dirty", vp); 269 #endif 270 } 271 } 272 splx(s); 273 return (UFS_UPDATE(vp, wait)); 274 } 275