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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 1.11 2004/08/24 14:01:57 drhodus 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>
62 #include "ufs_extern.h"
65 #include "ffs_extern.h"
67 static int ffs_fsync (struct vop_fsync_args *);
68 static int ffs_getpages (struct vop_getpages_args *);
69 static int ffs_putpages (struct vop_putpages_args *);
70 static int ffs_read (struct vop_read_args *);
71 static int ffs_write (struct vop_write_args *);
73 /* Global vfs data structures for ufs. */
74 struct vnodeopv_entry_desc ffs_vnodeop_entries[] = {
75 { &vop_default_desc, (void *) ufs_vnoperate },
76 { &vop_fsync_desc, (void *) ffs_fsync },
77 { &vop_getpages_desc, (void *) ffs_getpages },
78 { &vop_putpages_desc, (void *) ffs_putpages },
79 { &vop_read_desc, (void *) ffs_read },
80 { &vop_balloc_desc, (void *) ffs_balloc },
81 { &vop_reallocblks_desc, (void *) ffs_reallocblks },
82 { &vop_write_desc, (void *) ffs_write },
86 struct vnodeopv_entry_desc ffs_specop_entries[] = {
87 { &vop_default_desc, (void *) ufs_vnoperatespec },
88 { &vop_fsync_desc, (void *) ffs_fsync },
92 struct vnodeopv_entry_desc ffs_fifoop_entries[] = {
93 { &vop_default_desc, (void *) ufs_vnoperatefifo },
94 { &vop_fsync_desc, (void *) ffs_fsync },
98 #include "ufs_readwrite.c"
101 * Synch an open file.
103 * ffs_fsync(struct vnode *a_vp, struct ucred *a_cred, int a_waitfor,
108 ffs_fsync(struct vop_fsync_args *ap)
110 struct vnode *vp = ap->a_vp;
113 int s, error, wait, passes, skipmeta;
116 wait = (ap->a_waitfor == MNT_WAIT);
117 if (vn_isdisk(vp, NULL)) {
119 if (vp->v_rdev && vp->v_rdev->si_mountpoint != NULL &&
120 (vp->v_rdev->si_mountpoint->mnt_flag & MNT_SOFTDEP))
121 softdep_fsync_mountdev(vp);
125 lbn = lblkno(ip->i_fs, (ip->i_size + ip->i_fs->fs_bsize - 1));
129 * Flush all dirty buffers associated with a vnode.
137 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp;
138 bp = TAILQ_NEXT(bp, b_vnbufs))
139 bp->b_flags &= ~B_SCANNED;
140 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) {
141 nbp = TAILQ_NEXT(bp, b_vnbufs);
143 * Reasons to skip this buffer: it has already been considered
144 * on this pass, this pass is the first time through on a
145 * synchronous flush request and the buffer being considered
146 * is metadata, the buffer has dependencies that will cause
147 * it to be redirtied and it has not already been deferred,
148 * or it is already being written.
150 if ((bp->b_flags & B_SCANNED) != 0)
152 bp->b_flags |= B_SCANNED;
153 if ((skipmeta == 1 && bp->b_lblkno < 0))
155 if (!wait && LIST_FIRST(&bp->b_dep) != NULL &&
156 (bp->b_flags & B_DEFERRED) == 0 &&
157 bioops.io_countdeps && (*bioops.io_countdeps)(bp, 0)) {
158 bp->b_flags |= B_DEFERRED;
161 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT))
163 if ((bp->b_flags & B_DELWRI) == 0)
164 panic("ffs_fsync: not dirty");
166 panic("ffs_fsync: vp != vp->b_vp");
168 * If this is a synchronous flush request, or it is not a
169 * file or device, start the write on this buffer immediatly.
171 if (wait || (vp->v_type != VREG && vp->v_type != VBLK)) {
174 * On our final pass through, do all I/O synchronously
175 * so that we can find out if our flush is failing
176 * because of write errors.
178 if (passes > 0 || !wait) {
179 if ((bp->b_flags & B_CLUSTEROK) && !wait) {
181 (void) vfs_bio_awrite(bp);
191 if ((error = bwrite(bp)) != 0)
195 } else if ((vp->v_type == VREG) && (bp->b_lblkno >= lbn)) {
197 * If the buffer is for data that has been truncated
198 * off the file, then throw it away.
201 bp->b_flags |= B_INVAL | B_NOCACHE;
210 * Since we may have slept during the I/O, we need
211 * to start from a known point.
213 nbp = TAILQ_FIRST(&vp->v_dirtyblkhd);
216 * If we were asked to do this synchronously, then go back for
217 * another pass, this time doing the metadata.
225 while (vp->v_numoutput) {
226 vp->v_flag |= VBWAIT;
227 (void)tsleep((caddr_t)&vp->v_numoutput, 0, "ffsfsn", 0);
231 * Ensure that any filesystem metatdata associated
232 * with the vnode has been written.
235 if ((error = softdep_sync_metadata(ap)) != 0)
239 if (!TAILQ_EMPTY(&vp->v_dirtyblkhd)) {
241 * Block devices associated with filesystems may
242 * have new I/O requests posted for them even if
243 * the vnode is locked, so no amount of trying will
244 * get them clean. Thus we give block devices a
245 * good effort, then just give up. For all other file
246 * types, go around and try again until it is clean.
253 if (!vn_isdisk(vp, NULL))
254 vprint("ffs_fsync: dirty", vp);
259 return (UFS_UPDATE(vp, wait));