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 "opt_ufs.h" 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/resourcevar.h> 42 #include <sys/signalvar.h> 43 #include <sys/kernel.h> 44 #include <sys/stat.h> 45 #include <sys/bio.h> 46 #include <sys/buf.h> 47 #include <sys/proc.h> 48 #include <sys/mount.h> 49 #include <sys/vnode.h> 50 #include <sys/conf.h> 51 52 #include <machine/limits.h> 53 54 #include <vm/vm.h> 55 #include <vm/vm_page.h> 56 #include <vm/vm_object.h> 57 #include <vm/vm_extern.h> 58 59 #include <ufs/ufs/extattr.h> 60 #include <ufs/ufs/quota.h> 61 #include <ufs/ufs/inode.h> 62 #include <ufs/ufs/ufsmount.h> 63 #include <ufs/ufs/ufs_extern.h> 64 65 #include <ufs/ffs/fs.h> 66 #include <ufs/ffs/ffs_extern.h> 67 68 int ffs_fsync __P((struct vop_fsync_args *)); 69 static int ffs_getpages __P((struct vop_getpages_args *)); 70 static int ffs_read __P((struct vop_read_args *)); 71 static int ffs_write __P((struct vop_write_args *)); 72 73 /* Global vfs data structures for ufs. */ 74 vop_t **ffs_vnodeop_p; 75 static struct vnodeopv_entry_desc ffs_vnodeop_entries[] = { 76 { &vop_default_desc, (vop_t *) ufs_vnoperate }, 77 { &vop_fsync_desc, (vop_t *) ffs_fsync }, 78 { &vop_getpages_desc, (vop_t *) ffs_getpages }, 79 { &vop_read_desc, (vop_t *) ffs_read }, 80 { &vop_reallocblks_desc, (vop_t *) ffs_reallocblks }, 81 { &vop_write_desc, (vop_t *) ffs_write }, 82 #ifdef UFS_EXTATTR 83 { &vop_getextattr_desc, (vop_t *) ufs_vop_getextattr }, 84 { &vop_setextattr_desc, (vop_t *) ufs_vop_setextattr }, 85 #endif 86 { NULL, NULL } 87 }; 88 static struct vnodeopv_desc ffs_vnodeop_opv_desc = 89 { &ffs_vnodeop_p, ffs_vnodeop_entries }; 90 91 vop_t **ffs_specop_p; 92 static struct vnodeopv_entry_desc ffs_specop_entries[] = { 93 { &vop_default_desc, (vop_t *) ufs_vnoperatespec }, 94 { &vop_fsync_desc, (vop_t *) ffs_fsync }, 95 #ifdef UFS_EXTATTR 96 { &vop_getextattr_desc, (vop_t *) ufs_vop_getextattr }, 97 { &vop_setextattr_desc, (vop_t *) ufs_vop_setextattr }, 98 #endif 99 { NULL, NULL } 100 }; 101 static struct vnodeopv_desc ffs_specop_opv_desc = 102 { &ffs_specop_p, ffs_specop_entries }; 103 104 vop_t **ffs_fifoop_p; 105 static struct vnodeopv_entry_desc ffs_fifoop_entries[] = { 106 { &vop_default_desc, (vop_t *) ufs_vnoperatefifo }, 107 #ifdef UFS_EXTATTR 108 { &vop_getextattr_desc, (vop_t *) ufs_vop_getextattr }, 109 { &vop_setextattr_desc, (vop_t *) ufs_vop_setextattr }, 110 #endif 111 { &vop_fsync_desc, (vop_t *) ffs_fsync }, 112 { NULL, NULL } 113 }; 114 static struct vnodeopv_desc ffs_fifoop_opv_desc = 115 { &ffs_fifoop_p, ffs_fifoop_entries }; 116 117 VNODEOP_SET(ffs_vnodeop_opv_desc); 118 VNODEOP_SET(ffs_specop_opv_desc); 119 VNODEOP_SET(ffs_fifoop_opv_desc); 120 121 #include <ufs/ufs/ufs_readwrite.c> 122 123 /* 124 * Synch an open file. 125 */ 126 /* ARGSUSED */ 127 int 128 ffs_fsync(ap) 129 struct vop_fsync_args /* { 130 struct vnode *a_vp; 131 struct ucred *a_cred; 132 int a_waitfor; 133 struct thread *a_td; 134 } */ *ap; 135 { 136 struct vnode *vp = ap->a_vp; 137 struct inode *ip = VTOI(vp); 138 struct buf *bp; 139 struct buf *nbp; 140 int s, error, wait, passes, skipmeta; 141 daddr_t lbn; 142 143 /* 144 * Snapshots have to be unlocked so they do not deadlock 145 * checking whether they need to copy their written buffers. 146 * We always hold a reference, so they cannot be removed 147 * out from underneath us. 148 */ 149 if (ip->i_flags & SF_SNAPSHOT) 150 VOP_UNLOCK(vp, 0, ap->a_td); 151 wait = (ap->a_waitfor == MNT_WAIT); 152 if (vn_isdisk(vp, NULL)) { 153 lbn = INT_MAX; 154 if (vp->v_rdev->si_mountpoint != NULL && 155 (vp->v_rdev->si_mountpoint->mnt_flag & MNT_SOFTDEP)) 156 softdep_fsync_mountdev(vp); 157 } else { 158 lbn = lblkno(ip->i_fs, (ip->i_size + ip->i_fs->fs_bsize - 1)); 159 } 160 161 /* 162 * Flush all dirty buffers associated with a vnode. 163 */ 164 passes = NIADDR + 1; 165 skipmeta = 0; 166 if (wait) 167 skipmeta = 1; 168 s = splbio(); 169 loop: 170 TAILQ_FOREACH(bp, &vp->v_dirtyblkhd, b_vnbufs) 171 bp->b_flags &= ~B_SCANNED; 172 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { 173 nbp = TAILQ_NEXT(bp, b_vnbufs); 174 /* 175 * Reasons to skip this buffer: it has already been considered 176 * on this pass, this pass is the first time through on a 177 * synchronous flush request and the buffer being considered 178 * is metadata, the buffer has dependencies that will cause 179 * it to be redirtied and it has not already been deferred, 180 * or it is already being written. 181 */ 182 if ((bp->b_flags & B_SCANNED) != 0) 183 continue; 184 bp->b_flags |= B_SCANNED; 185 if ((skipmeta == 1 && bp->b_lblkno < 0)) 186 continue; 187 if (!wait && LIST_FIRST(&bp->b_dep) != NULL && 188 (bp->b_flags & B_DEFERRED) == 0 && 189 buf_countdeps(bp, 0)) { 190 bp->b_flags |= B_DEFERRED; 191 continue; 192 } 193 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) 194 continue; 195 if ((bp->b_flags & B_DELWRI) == 0) 196 panic("ffs_fsync: not dirty"); 197 if (vp != bp->b_vp) 198 panic("ffs_fsync: vp != vp->b_vp"); 199 /* 200 * If this is a synchronous flush request, or it is not a 201 * file or device, start the write on this buffer immediatly. 202 */ 203 if (wait || (vp->v_type != VREG && vp->v_type != VBLK)) { 204 205 /* 206 * On our final pass through, do all I/O synchronously 207 * so that we can find out if our flush is failing 208 * because of write errors. 209 */ 210 if (passes > 0 || !wait) { 211 if ((bp->b_flags & B_CLUSTEROK) && !wait) { 212 BUF_UNLOCK(bp); 213 (void) vfs_bio_awrite(bp); 214 } else { 215 bremfree(bp); 216 splx(s); 217 (void) bawrite(bp); 218 s = splbio(); 219 } 220 } else { 221 bremfree(bp); 222 splx(s); 223 if ((error = bwrite(bp)) != 0) 224 return (error); 225 s = splbio(); 226 } 227 } else if ((vp->v_type == VREG) && (bp->b_lblkno >= lbn)) { 228 /* 229 * If the buffer is for data that has been truncated 230 * off the file, then throw it away. 231 */ 232 bremfree(bp); 233 bp->b_flags |= B_INVAL | B_NOCACHE; 234 splx(s); 235 brelse(bp); 236 s = splbio(); 237 } else { 238 BUF_UNLOCK(bp); 239 vfs_bio_awrite(bp); 240 } 241 /* 242 * Since we may have slept during the I/O, we need 243 * to start from a known point. 244 */ 245 nbp = TAILQ_FIRST(&vp->v_dirtyblkhd); 246 } 247 /* 248 * If we were asked to do this synchronously, then go back for 249 * another pass, this time doing the metadata. 250 */ 251 if (skipmeta) { 252 skipmeta = 0; 253 goto loop; 254 } 255 256 if (wait) { 257 while (vp->v_numoutput) { 258 vp->v_flag |= VBWAIT; 259 (void) tsleep((caddr_t)&vp->v_numoutput, 260 PRIBIO + 4, "ffsfsn", 0); 261 } 262 263 /* 264 * Ensure that any filesystem metatdata associated 265 * with the vnode has been written. 266 */ 267 splx(s); 268 if ((error = softdep_sync_metadata(ap)) != 0) 269 return (error); 270 s = splbio(); 271 272 if (!TAILQ_EMPTY(&vp->v_dirtyblkhd)) { 273 /* 274 * Block devices associated with filesystems may 275 * have new I/O requests posted for them even if 276 * the vnode is locked, so no amount of trying will 277 * get them clean. Thus we give block devices a 278 * good effort, then just give up. For all other file 279 * types, go around and try again until it is clean. 280 */ 281 if (passes > 0) { 282 passes -= 1; 283 goto loop; 284 } 285 #ifdef DIAGNOSTIC 286 if (!vn_isdisk(vp, NULL)) 287 vprint("ffs_fsync: dirty", vp); 288 #endif 289 } 290 } 291 splx(s); 292 error = UFS_UPDATE(vp, wait); 293 if (ip->i_flags & SF_SNAPSHOT) 294 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, ap->a_td); 295 return (error); 296 } 297