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