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(struct vop_fsync_args *); 69 static int ffs_getpages(struct vop_getpages_args *); 70 static int ffs_read(struct vop_read_args *); 71 static int ffs_write(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 wait = (ap->a_waitfor == MNT_WAIT); 144 if (vn_isdisk(vp, NULL)) { 145 lbn = INT_MAX; 146 if (vp->v_rdev->si_mountpoint != NULL && 147 (vp->v_rdev->si_mountpoint->mnt_flag & MNT_SOFTDEP)) 148 softdep_fsync_mountdev(vp); 149 } else { 150 lbn = lblkno(ip->i_fs, (ip->i_size + ip->i_fs->fs_bsize - 1)); 151 } 152 153 /* 154 * Flush all dirty buffers associated with a vnode. 155 */ 156 passes = NIADDR + 1; 157 skipmeta = 0; 158 if (wait) 159 skipmeta = 1; 160 s = splbio(); 161 loop: 162 TAILQ_FOREACH(bp, &vp->v_dirtyblkhd, b_vnbufs) 163 bp->b_flags &= ~B_SCANNED; 164 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { 165 nbp = TAILQ_NEXT(bp, b_vnbufs); 166 /* 167 * Reasons to skip this buffer: it has already been considered 168 * on this pass, this pass is the first time through on a 169 * synchronous flush request and the buffer being considered 170 * is metadata, the buffer has dependencies that will cause 171 * it to be redirtied and it has not already been deferred, 172 * or it is already being written. 173 */ 174 if ((bp->b_flags & B_SCANNED) != 0) 175 continue; 176 bp->b_flags |= B_SCANNED; 177 if ((skipmeta == 1 && bp->b_lblkno < 0)) 178 continue; 179 if (!wait && LIST_FIRST(&bp->b_dep) != NULL && 180 (bp->b_flags & B_DEFERRED) == 0 && 181 buf_countdeps(bp, 0)) { 182 bp->b_flags |= B_DEFERRED; 183 continue; 184 } 185 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) 186 continue; 187 if ((bp->b_flags & B_DELWRI) == 0) 188 panic("ffs_fsync: not dirty"); 189 if (vp != bp->b_vp) 190 panic("ffs_fsync: vp != vp->b_vp"); 191 /* 192 * If this is a synchronous flush request, or it is not a 193 * file or device, start the write on this buffer immediatly. 194 */ 195 if (wait || (vp->v_type != VREG && vp->v_type != VBLK)) { 196 197 /* 198 * On our final pass through, do all I/O synchronously 199 * so that we can find out if our flush is failing 200 * because of write errors. 201 */ 202 if (passes > 0 || !wait) { 203 if ((bp->b_flags & B_CLUSTEROK) && !wait) { 204 BUF_UNLOCK(bp); 205 (void) vfs_bio_awrite(bp); 206 } else { 207 bremfree(bp); 208 splx(s); 209 (void) bawrite(bp); 210 s = splbio(); 211 } 212 } else { 213 bremfree(bp); 214 splx(s); 215 if ((error = bwrite(bp)) != 0) 216 return (error); 217 s = splbio(); 218 } 219 } else if ((vp->v_type == VREG) && (bp->b_lblkno >= lbn)) { 220 /* 221 * If the buffer is for data that has been truncated 222 * off the file, then throw it away. 223 */ 224 bremfree(bp); 225 bp->b_flags |= B_INVAL | B_NOCACHE; 226 splx(s); 227 brelse(bp); 228 s = splbio(); 229 } else { 230 BUF_UNLOCK(bp); 231 vfs_bio_awrite(bp); 232 } 233 /* 234 * Since we may have slept during the I/O, we need 235 * to start from a known point. 236 */ 237 nbp = TAILQ_FIRST(&vp->v_dirtyblkhd); 238 } 239 /* 240 * If we were asked to do this synchronously, then go back for 241 * another pass, this time doing the metadata. 242 */ 243 if (skipmeta) { 244 skipmeta = 0; 245 goto loop; 246 } 247 248 if (wait) { 249 while (vp->v_numoutput) { 250 vp->v_flag |= VBWAIT; 251 (void) tsleep((caddr_t)&vp->v_numoutput, 252 PRIBIO + 4, "ffsfsn", 0); 253 } 254 255 /* 256 * Ensure that any filesystem metatdata associated 257 * with the vnode has been written. 258 */ 259 splx(s); 260 if ((error = softdep_sync_metadata(ap)) != 0) 261 return (error); 262 s = splbio(); 263 264 if (!TAILQ_EMPTY(&vp->v_dirtyblkhd)) { 265 /* 266 * Block devices associated with filesystems may 267 * have new I/O requests posted for them even if 268 * the vnode is locked, so no amount of trying will 269 * get them clean. Thus we give block devices a 270 * good effort, then just give up. For all other file 271 * types, go around and try again until it is clean. 272 */ 273 if (passes > 0) { 274 passes -= 1; 275 goto loop; 276 } 277 #ifdef DIAGNOSTIC 278 if (!vn_isdisk(vp, NULL)) 279 vprint("ffs_fsync: dirty", vp); 280 #endif 281 } 282 } 283 splx(s); 284 return (UFS_UPDATE(vp, wait)); 285 } 286