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33 * @(#)ffs_vnops.c 8.15 (Berkeley) 5/14/95
34 * $FreeBSD: src/sys/ufs/ffs/ffs_vnops.c,v 1.64 2000/01/10 12:04:25 phk Exp $
35 * $DragonFly: src/sys/vfs/ufs/ffs_vnops.c,v 1.2 2003/06/17 04:28:59 dillon Exp $
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/resourcevar.h>
41 #include <sys/signalvar.h>
42 #include <sys/kernel.h>
46 #include <sys/mount.h>
47 #include <sys/vnode.h>
50 #include <machine/limits.h>
53 #include <vm/vm_page.h>
54 #include <vm/vm_object.h>
55 #include <vm/vm_extern.h>
57 #include <ufs/ufs/quota.h>
58 #include <ufs/ufs/inode.h>
59 #include <ufs/ufs/ufsmount.h>
60 #include <ufs/ufs/ufs_extern.h>
62 #include <ufs/ffs/fs.h>
63 #include <ufs/ffs/ffs_extern.h>
65 static int ffs_fsync __P((struct vop_fsync_args *));
66 static int ffs_getpages __P((struct vop_getpages_args *));
67 static int ffs_putpages __P((struct vop_putpages_args *));
68 static int ffs_read __P((struct vop_read_args *));
69 static int ffs_write __P((struct vop_write_args *));
71 /* Global vfs data structures for ufs. */
72 vop_t **ffs_vnodeop_p;
73 static struct vnodeopv_entry_desc ffs_vnodeop_entries[] = {
74 { &vop_default_desc, (vop_t *) ufs_vnoperate },
75 { &vop_fsync_desc, (vop_t *) ffs_fsync },
76 { &vop_getpages_desc, (vop_t *) ffs_getpages },
77 { &vop_putpages_desc, (vop_t *) ffs_putpages },
78 { &vop_read_desc, (vop_t *) ffs_read },
79 { &vop_balloc_desc, (vop_t *) ffs_balloc },
80 { &vop_reallocblks_desc, (vop_t *) ffs_reallocblks },
81 { &vop_write_desc, (vop_t *) ffs_write },
84 static struct vnodeopv_desc ffs_vnodeop_opv_desc =
85 { &ffs_vnodeop_p, ffs_vnodeop_entries };
88 static struct vnodeopv_entry_desc ffs_specop_entries[] = {
89 { &vop_default_desc, (vop_t *) ufs_vnoperatespec },
90 { &vop_fsync_desc, (vop_t *) ffs_fsync },
93 static struct vnodeopv_desc ffs_specop_opv_desc =
94 { &ffs_specop_p, ffs_specop_entries };
97 static struct vnodeopv_entry_desc ffs_fifoop_entries[] = {
98 { &vop_default_desc, (vop_t *) ufs_vnoperatefifo },
99 { &vop_fsync_desc, (vop_t *) ffs_fsync },
102 static struct vnodeopv_desc ffs_fifoop_opv_desc =
103 { &ffs_fifoop_p, ffs_fifoop_entries };
105 VNODEOP_SET(ffs_vnodeop_opv_desc);
106 VNODEOP_SET(ffs_specop_opv_desc);
107 VNODEOP_SET(ffs_fifoop_opv_desc);
109 #include <ufs/ufs/ufs_readwrite.c>
112 * Synch an open file.
117 struct vop_fsync_args /* {
119 struct ucred *a_cred;
124 struct vnode *vp = ap->a_vp;
127 int s, error, wait, passes, skipmeta;
130 wait = (ap->a_waitfor == MNT_WAIT);
131 if (vn_isdisk(vp, NULL)) {
133 if (vp->v_specmountpoint != NULL &&
134 (vp->v_specmountpoint->mnt_flag & MNT_SOFTDEP))
135 softdep_fsync_mountdev(vp);
139 lbn = lblkno(ip->i_fs, (ip->i_size + ip->i_fs->fs_bsize - 1));
143 * Flush all dirty buffers associated with a vnode.
151 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp;
152 bp = TAILQ_NEXT(bp, b_vnbufs))
153 bp->b_flags &= ~B_SCANNED;
154 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) {
155 nbp = TAILQ_NEXT(bp, b_vnbufs);
157 * Reasons to skip this buffer: it has already been considered
158 * on this pass, this pass is the first time through on a
159 * synchronous flush request and the buffer being considered
160 * is metadata, the buffer has dependencies that will cause
161 * it to be redirtied and it has not already been deferred,
162 * or it is already being written.
164 if ((bp->b_flags & B_SCANNED) != 0)
166 bp->b_flags |= B_SCANNED;
167 if ((skipmeta == 1 && bp->b_lblkno < 0))
169 if (!wait && LIST_FIRST(&bp->b_dep) != NULL &&
170 (bp->b_flags & B_DEFERRED) == 0 &&
171 bioops.io_countdeps && (*bioops.io_countdeps)(bp, 0)) {
172 bp->b_flags |= B_DEFERRED;
175 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT))
177 if ((bp->b_flags & B_DELWRI) == 0)
178 panic("ffs_fsync: not dirty");
180 panic("ffs_fsync: vp != vp->b_vp");
182 * If this is a synchronous flush request, or it is not a
183 * file or device, start the write on this buffer immediatly.
185 if (wait || (vp->v_type != VREG && vp->v_type != VBLK)) {
188 * On our final pass through, do all I/O synchronously
189 * so that we can find out if our flush is failing
190 * because of write errors.
192 if (passes > 0 || !wait) {
193 if ((bp->b_flags & B_CLUSTEROK) && !wait) {
195 (void) vfs_bio_awrite(bp);
205 if ((error = bwrite(bp)) != 0)
209 } else if ((vp->v_type == VREG) && (bp->b_lblkno >= lbn)) {
211 * If the buffer is for data that has been truncated
212 * off the file, then throw it away.
215 bp->b_flags |= B_INVAL | B_NOCACHE;
224 * Since we may have slept during the I/O, we need
225 * to start from a known point.
227 nbp = TAILQ_FIRST(&vp->v_dirtyblkhd);
230 * If we were asked to do this synchronously, then go back for
231 * another pass, this time doing the metadata.
239 while (vp->v_numoutput) {
240 vp->v_flag |= VBWAIT;
241 (void) tsleep((caddr_t)&vp->v_numoutput,
242 PRIBIO + 4, "ffsfsn", 0);
246 * Ensure that any filesystem metatdata associated
247 * with the vnode has been written.
250 if ((error = softdep_sync_metadata(ap)) != 0)
254 if (!TAILQ_EMPTY(&vp->v_dirtyblkhd)) {
256 * Block devices associated with filesystems may
257 * have new I/O requests posted for them even if
258 * the vnode is locked, so no amount of trying will
259 * get them clean. Thus we give block devices a
260 * good effort, then just give up. For all other file
261 * types, go around and try again until it is clean.
268 if (!vn_isdisk(vp, NULL))
269 vprint("ffs_fsync: dirty", vp);
274 return (UFS_UPDATE(vp, wait));