2 * SPDX-License-Identifier: (BSD-2-Clause-FreeBSD AND BSD-3-Clause)
4 * Copyright (c) 2002, 2003 Networks Associates Technology, Inc.
7 * This software was developed for the FreeBSD Project by Marshall
8 * Kirk McKusick and Network Associates Laboratories, the Security
9 * Research Division of Network Associates, Inc. under DARPA/SPAWAR
10 * contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * Copyright (c) 1982, 1986, 1989, 1993
35 * The Regents of the University of California. All rights reserved.
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38 * modification, are permitted provided that the following conditions
40 * 1. Redistributions of source code must retain the above copyright
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51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
61 * from: @(#)ufs_readwrite.c 8.11 (Berkeley) 5/8/95
62 * from: $FreeBSD: .../ufs/ufs_readwrite.c,v 1.96 2002/08/12 09:22:11 phk ...
63 * @(#)ffs_vnops.c 8.15 (Berkeley) 5/14/95
66 #include <sys/cdefs.h>
67 __FBSDID("$FreeBSD$");
69 #include <sys/param.h>
71 #include <sys/systm.h>
74 #include <sys/extattr.h>
75 #include <sys/kernel.h>
76 #include <sys/limits.h>
77 #include <sys/malloc.h>
78 #include <sys/mount.h>
80 #include <sys/rwlock.h>
82 #include <sys/sysctl.h>
83 #include <sys/vmmeter.h>
84 #include <sys/vnode.h>
87 #include <vm/vm_param.h>
88 #include <vm/vm_extern.h>
89 #include <vm/vm_object.h>
90 #include <vm/vm_page.h>
91 #include <vm/vm_pager.h>
92 #include <vm/vnode_pager.h>
94 #include <ufs/ufs/extattr.h>
95 #include <ufs/ufs/quota.h>
96 #include <ufs/ufs/inode.h>
97 #include <ufs/ufs/ufs_extern.h>
98 #include <ufs/ufs/ufsmount.h>
100 #include <ufs/ffs/fs.h>
101 #include <ufs/ffs/ffs_extern.h>
102 #include "opt_directio.h"
105 #define ALIGNED_TO(ptr, s) \
106 (((uintptr_t)(ptr) & (_Alignof(s) - 1)) == 0)
109 extern int ffs_rawread(struct vnode *vp, struct uio *uio, int *workdone);
111 static vop_fdatasync_t ffs_fdatasync;
112 static vop_fsync_t ffs_fsync;
113 static vop_getpages_t ffs_getpages;
114 static vop_lock1_t ffs_lock;
115 static vop_read_t ffs_read;
116 static vop_write_t ffs_write;
117 static int ffs_extread(struct vnode *vp, struct uio *uio, int ioflag);
118 static int ffs_extwrite(struct vnode *vp, struct uio *uio, int ioflag,
120 static vop_strategy_t ffsext_strategy;
121 static vop_closeextattr_t ffs_closeextattr;
122 static vop_deleteextattr_t ffs_deleteextattr;
123 static vop_getextattr_t ffs_getextattr;
124 static vop_listextattr_t ffs_listextattr;
125 static vop_openextattr_t ffs_openextattr;
126 static vop_setextattr_t ffs_setextattr;
127 static vop_vptofh_t ffs_vptofh;
129 /* Global vfs data structures for ufs. */
130 struct vop_vector ffs_vnodeops1 = {
131 .vop_default = &ufs_vnodeops,
132 .vop_fsync = ffs_fsync,
133 .vop_fdatasync = ffs_fdatasync,
134 .vop_getpages = ffs_getpages,
135 .vop_getpages_async = vnode_pager_local_getpages_async,
136 .vop_lock1 = ffs_lock,
137 .vop_read = ffs_read,
138 .vop_reallocblks = ffs_reallocblks,
139 .vop_write = ffs_write,
140 .vop_vptofh = ffs_vptofh,
143 struct vop_vector ffs_fifoops1 = {
144 .vop_default = &ufs_fifoops,
145 .vop_fsync = ffs_fsync,
146 .vop_fdatasync = ffs_fdatasync,
147 .vop_reallocblks = ffs_reallocblks, /* XXX: really ??? */
148 .vop_vptofh = ffs_vptofh,
151 /* Global vfs data structures for ufs. */
152 struct vop_vector ffs_vnodeops2 = {
153 .vop_default = &ufs_vnodeops,
154 .vop_fsync = ffs_fsync,
155 .vop_fdatasync = ffs_fdatasync,
156 .vop_getpages = ffs_getpages,
157 .vop_getpages_async = vnode_pager_local_getpages_async,
158 .vop_lock1 = ffs_lock,
159 .vop_read = ffs_read,
160 .vop_reallocblks = ffs_reallocblks,
161 .vop_write = ffs_write,
162 .vop_closeextattr = ffs_closeextattr,
163 .vop_deleteextattr = ffs_deleteextattr,
164 .vop_getextattr = ffs_getextattr,
165 .vop_listextattr = ffs_listextattr,
166 .vop_openextattr = ffs_openextattr,
167 .vop_setextattr = ffs_setextattr,
168 .vop_vptofh = ffs_vptofh,
171 struct vop_vector ffs_fifoops2 = {
172 .vop_default = &ufs_fifoops,
173 .vop_fsync = ffs_fsync,
174 .vop_fdatasync = ffs_fdatasync,
175 .vop_lock1 = ffs_lock,
176 .vop_reallocblks = ffs_reallocblks,
177 .vop_strategy = ffsext_strategy,
178 .vop_closeextattr = ffs_closeextattr,
179 .vop_deleteextattr = ffs_deleteextattr,
180 .vop_getextattr = ffs_getextattr,
181 .vop_listextattr = ffs_listextattr,
182 .vop_openextattr = ffs_openextattr,
183 .vop_setextattr = ffs_setextattr,
184 .vop_vptofh = ffs_vptofh,
188 * Synch an open file.
192 ffs_fsync(struct vop_fsync_args *ap)
201 error = ffs_syncvnode(vp, ap->a_waitfor, 0);
204 if (ap->a_waitfor == MNT_WAIT && DOINGSOFTDEP(vp)) {
205 error = softdep_fsync(vp);
210 * The softdep_fsync() function may drop vp lock,
211 * allowing for dirty buffers to reappear on the
212 * bo_dirty list. Recheck and resync as needed.
215 if ((vp->v_type == VREG || vp->v_type == VDIR) &&
216 (bo->bo_numoutput > 0 || bo->bo_dirty.bv_cnt > 0)) {
226 ffs_syncvnode(struct vnode *vp, int waitfor, int flags)
230 struct buf *bp, *nbp;
233 bool still_dirty, wait;
236 ip->i_flag &= ~IN_NEEDSYNC;
240 * When doing MNT_WAIT we must first flush all dependencies
243 if (DOINGSOFTDEP(vp) && waitfor == MNT_WAIT &&
244 (error = softdep_sync_metadata(vp)) != 0)
248 * Flush all dirty buffers associated with a vnode.
252 wait = false; /* Always do an async pass first. */
253 lbn = lblkno(ITOFS(ip), (ip->i_size + ITOFS(ip)->fs_bsize - 1));
256 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs)
257 bp->b_vflags &= ~BV_SCANNED;
258 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
260 * Reasons to skip this buffer: it has already been considered
261 * on this pass, the buffer has dependencies that will cause
262 * it to be redirtied and it has not already been deferred,
263 * or it is already being written.
265 if ((bp->b_vflags & BV_SCANNED) != 0)
267 bp->b_vflags |= BV_SCANNED;
269 * Flush indirects in order, if requested.
271 * Note that if only datasync is requested, we can
272 * skip indirect blocks when softupdates are not
273 * active. Otherwise we must flush them with data,
274 * since dependencies prevent data block writes.
276 if (waitfor == MNT_WAIT && bp->b_lblkno <= -UFS_NDADDR &&
277 (lbn_level(bp->b_lblkno) >= passes ||
278 ((flags & DATA_ONLY) != 0 && !DOINGSOFTDEP(vp))))
280 if (bp->b_lblkno > lbn)
281 panic("ffs_syncvnode: syncing truncated data.");
282 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL) == 0) {
286 LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK,
287 BO_LOCKPTR(bo)) != 0) {
288 bp->b_vflags &= ~BV_SCANNED;
293 if ((bp->b_flags & B_DELWRI) == 0)
294 panic("ffs_fsync: not dirty");
296 * Check for dependencies and potentially complete them.
298 if (!LIST_EMPTY(&bp->b_dep) &&
299 (error = softdep_sync_buf(vp, bp,
300 wait ? MNT_WAIT : MNT_NOWAIT)) != 0) {
302 if (error != EBUSY) {
306 /* If we deferred once, don't defer again. */
307 if ((bp->b_flags & B_DEFERRED) == 0) {
308 bp->b_flags |= B_DEFERRED;
315 if ((error = bwrite(bp)) != 0)
317 } else if ((bp->b_flags & B_CLUSTEROK)) {
318 (void) vfs_bio_awrite(bp);
325 * Since we may have slept during the I/O, we need
326 * to start from a known point.
329 nbp = TAILQ_FIRST(&bo->bo_dirty.bv_hd);
331 if (waitfor != MNT_WAIT) {
333 if ((flags & NO_INO_UPDT) != 0)
336 return (ffs_update(vp, 0));
338 /* Drain IO to see if we're done. */
339 bufobj_wwait(bo, 0, 0);
341 * Block devices associated with filesystems may have new I/O
342 * requests posted for them even if the vnode is locked, so no
343 * amount of trying will get them clean. We make several passes
346 * Regular files may need multiple passes to flush all dependency
347 * work as it is possible that we must write once per indirect
348 * level, once for the leaf, and once for the inode and each of
349 * these will be done with one sync and one async pass.
351 if (bo->bo_dirty.bv_cnt > 0) {
352 if ((flags & DATA_ONLY) == 0) {
356 * For data-only sync, dirty indirect buffers
360 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) {
361 if (bp->b_lblkno > -UFS_NDADDR) {
369 /* Write the inode after sync passes to flush deps. */
370 if (wait && DOINGSOFTDEP(vp) &&
371 (flags & NO_INO_UPDT) == 0) {
376 /* switch between sync/async. */
378 if (wait || ++passes < UFS_NIADDR + 2)
381 if (!vn_isdisk(vp, NULL))
382 vn_printf(vp, "ffs_fsync: dirty ");
388 if ((flags & DATA_ONLY) == 0) {
389 if ((flags & NO_INO_UPDT) == 0)
390 error = ffs_update(vp, 1);
392 softdep_journal_fsync(VTOI(vp));
398 ffs_fdatasync(struct vop_fdatasync_args *ap)
401 return (ffs_syncvnode(ap->a_vp, MNT_WAIT, DATA_ONLY));
406 struct vop_lock1_args /* {
414 #ifndef NO_FFS_SNAPSHOT
420 switch (ap->a_flags & LK_TYPE_MASK) {
427 #ifdef DEBUG_VFS_LOCKS
428 KASSERT(vp->v_holdcnt != 0,
429 ("ffs_lock %p: zero hold count", vp));
432 result = _lockmgr_args(lkp, flags, VI_MTX(vp),
433 LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT,
434 ap->a_file, ap->a_line);
435 if (lkp == vp->v_vnlock || result != 0)
438 * Apparent success, except that the vnode
439 * mutated between snapshot file vnode and
440 * regular file vnode while this process
441 * slept. The lock currently held is not the
442 * right lock. Release it, and try to get the
445 (void) _lockmgr_args(lkp, LK_RELEASE, NULL,
446 LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT,
447 ap->a_file, ap->a_line);
448 if ((flags & (LK_INTERLOCK | LK_NOWAIT)) ==
449 (LK_INTERLOCK | LK_NOWAIT))
451 if ((flags & LK_TYPE_MASK) == LK_UPGRADE)
452 flags = (flags & ~LK_TYPE_MASK) | LK_EXCLUSIVE;
453 flags &= ~LK_INTERLOCK;
457 result = VOP_LOCK1_APV(&ufs_vnodeops, ap);
461 return (VOP_LOCK1_APV(&ufs_vnodeops, ap));
466 * Vnode op for reading.
470 struct vop_read_args /* {
474 struct ucred *a_cred;
482 ufs_lbn_t lbn, nextlbn;
484 long size, xfersize, blkoffset;
492 ioflag = ap->a_ioflag;
493 if (ap->a_ioflag & IO_EXT)
495 return (ffs_extread(vp, uio, ioflag));
497 panic("ffs_read+IO_EXT");
500 if ((ioflag & IO_DIRECT) != 0) {
503 error = ffs_rawread(vp, uio, &workdone);
504 if (error != 0 || workdone != 0)
509 seqcount = ap->a_ioflag >> IO_SEQSHIFT;
513 if (uio->uio_rw != UIO_READ)
514 panic("ffs_read: mode");
516 if (vp->v_type == VLNK) {
517 if ((int)ip->i_size < vp->v_mount->mnt_maxsymlinklen)
518 panic("ffs_read: short symlink");
519 } else if (vp->v_type != VREG && vp->v_type != VDIR)
520 panic("ffs_read: type %d", vp->v_type);
522 orig_resid = uio->uio_resid;
523 KASSERT(orig_resid >= 0, ("ffs_read: uio->uio_resid < 0"));
526 KASSERT(uio->uio_offset >= 0, ("ffs_read: uio->uio_offset < 0"));
528 if (uio->uio_offset < ip->i_size &&
529 uio->uio_offset >= fs->fs_maxfilesize)
532 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) {
533 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0)
535 lbn = lblkno(fs, uio->uio_offset);
539 * size of buffer. The buffer representing the
540 * end of the file is rounded up to the size of
541 * the block type ( fragment or full block,
544 size = blksize(fs, ip, lbn);
545 blkoffset = blkoff(fs, uio->uio_offset);
548 * The amount we want to transfer in this iteration is
549 * one FS block less the amount of the data before
550 * our startpoint (duh!)
552 xfersize = fs->fs_bsize - blkoffset;
555 * But if we actually want less than the block,
556 * or the file doesn't have a whole block more of data,
557 * then use the lesser number.
559 if (uio->uio_resid < xfersize)
560 xfersize = uio->uio_resid;
561 if (bytesinfile < xfersize)
562 xfersize = bytesinfile;
564 if (lblktosize(fs, nextlbn) >= ip->i_size) {
566 * Don't do readahead if this is the end of the file.
568 error = bread_gb(vp, lbn, size, NOCRED,
570 } else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) {
572 * Otherwise if we are allowed to cluster,
573 * grab as much as we can.
575 * XXX This may not be a win if we are not
576 * doing sequential access.
578 error = cluster_read(vp, ip->i_size, lbn,
579 size, NOCRED, blkoffset + uio->uio_resid,
580 seqcount, GB_UNMAPPED, &bp);
581 } else if (seqcount > 1) {
583 * If we are NOT allowed to cluster, then
584 * if we appear to be acting sequentially,
585 * fire off a request for a readahead
586 * as well as a read. Note that the 4th and 5th
587 * arguments point to arrays of the size specified in
590 u_int nextsize = blksize(fs, ip, nextlbn);
591 error = breadn_flags(vp, lbn, size, &nextlbn,
592 &nextsize, 1, NOCRED, GB_UNMAPPED, NULL, &bp);
595 * Failing all of the above, just read what the
596 * user asked for. Interestingly, the same as
597 * the first option above.
599 error = bread_gb(vp, lbn, size, NOCRED,
609 * We should only get non-zero b_resid when an I/O error
610 * has occurred, which should cause us to break above.
611 * However, if the short read did not cause an error,
612 * then we want to ensure that we do not uiomove bad
613 * or uninitialized data.
616 if (size < xfersize) {
622 if (buf_mapped(bp)) {
623 error = vn_io_fault_uiomove((char *)bp->b_data +
624 blkoffset, (int)xfersize, uio);
626 error = vn_io_fault_pgmove(bp->b_pages, blkoffset,
632 vfs_bio_brelse(bp, ioflag);
636 * This can only happen in the case of an error
637 * because the loop above resets bp to NULL on each iteration
638 * and on normal completion has not set a new value into it.
639 * so it must have come from a 'break' statement
642 vfs_bio_brelse(bp, ioflag);
644 if ((error == 0 || uio->uio_resid != orig_resid) &&
645 (vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0 &&
646 (ip->i_flag & IN_ACCESS) == 0) {
648 ip->i_flag |= IN_ACCESS;
655 * Vnode op for writing.
659 struct vop_write_args /* {
663 struct ucred *a_cred;
675 int blkoffset, error, flags, ioflag, size, xfersize;
679 ioflag = ap->a_ioflag;
680 if (ap->a_ioflag & IO_EXT)
682 return (ffs_extwrite(vp, uio, ioflag, ap->a_cred));
684 panic("ffs_write+IO_EXT");
687 seqcount = ap->a_ioflag >> IO_SEQSHIFT;
691 if (uio->uio_rw != UIO_WRITE)
692 panic("ffs_write: mode");
695 switch (vp->v_type) {
697 if (ioflag & IO_APPEND)
698 uio->uio_offset = ip->i_size;
699 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size)
705 panic("ffs_write: dir write");
708 panic("ffs_write: type %p %d (%d,%d)", vp, (int)vp->v_type,
709 (int)uio->uio_offset,
714 KASSERT(uio->uio_resid >= 0, ("ffs_write: uio->uio_resid < 0"));
715 KASSERT(uio->uio_offset >= 0, ("ffs_write: uio->uio_offset < 0"));
717 if ((uoff_t)uio->uio_offset + uio->uio_resid > fs->fs_maxfilesize)
720 * Maybe this should be above the vnode op call, but so long as
721 * file servers have no limits, I don't think it matters.
723 if (vn_rlimit_fsize(vp, uio, uio->uio_td))
726 resid = uio->uio_resid;
728 if (seqcount > BA_SEQMAX)
729 flags = BA_SEQMAX << BA_SEQSHIFT;
731 flags = seqcount << BA_SEQSHIFT;
732 if (ioflag & IO_SYNC)
734 flags |= BA_UNMAPPED;
736 for (error = 0; uio->uio_resid > 0;) {
737 lbn = lblkno(fs, uio->uio_offset);
738 blkoffset = blkoff(fs, uio->uio_offset);
739 xfersize = fs->fs_bsize - blkoffset;
740 if (uio->uio_resid < xfersize)
741 xfersize = uio->uio_resid;
742 if (uio->uio_offset + xfersize > ip->i_size)
743 vnode_pager_setsize(vp, uio->uio_offset + xfersize);
746 * We must perform a read-before-write if the transfer size
747 * does not cover the entire buffer.
749 if (fs->fs_bsize > xfersize)
753 /* XXX is uio->uio_offset the right thing here? */
754 error = UFS_BALLOC(vp, uio->uio_offset, xfersize,
755 ap->a_cred, flags, &bp);
757 vnode_pager_setsize(vp, ip->i_size);
760 if ((ioflag & (IO_SYNC|IO_INVAL)) == (IO_SYNC|IO_INVAL))
761 bp->b_flags |= B_NOCACHE;
763 if (uio->uio_offset + xfersize > ip->i_size) {
764 ip->i_size = uio->uio_offset + xfersize;
765 DIP_SET(ip, i_size, ip->i_size);
768 size = blksize(fs, ip, lbn) - bp->b_resid;
772 if (buf_mapped(bp)) {
773 error = vn_io_fault_uiomove((char *)bp->b_data +
774 blkoffset, (int)xfersize, uio);
776 error = vn_io_fault_pgmove(bp->b_pages, blkoffset,
780 * If the buffer is not already filled and we encounter an
781 * error while trying to fill it, we have to clear out any
782 * garbage data from the pages instantiated for the buffer.
783 * If we do not, a failed uiomove() during a write can leave
784 * the prior contents of the pages exposed to a userland mmap.
786 * Note that we need only clear buffers with a transfer size
787 * equal to the block size because buffers with a shorter
788 * transfer size were cleared above by the call to UFS_BALLOC()
789 * with the BA_CLRBUF flag set.
791 * If the source region for uiomove identically mmaps the
792 * buffer, uiomove() performed the NOP copy, and the buffer
793 * content remains valid because the page fault handler
794 * validated the pages.
796 if (error != 0 && (bp->b_flags & B_CACHE) == 0 &&
797 fs->fs_bsize == xfersize)
800 vfs_bio_set_flags(bp, ioflag);
803 * If IO_SYNC each buffer is written synchronously. Otherwise
804 * if we have a severe page deficiency write the buffer
805 * asynchronously. Otherwise try to cluster, and if that
806 * doesn't do it then either do an async write (if O_DIRECT),
807 * or a delayed write (if not).
809 if (ioflag & IO_SYNC) {
811 } else if (vm_page_count_severe() ||
812 buf_dirty_count_severe() ||
813 (ioflag & IO_ASYNC)) {
814 bp->b_flags |= B_CLUSTEROK;
816 } else if (xfersize + blkoffset == fs->fs_bsize) {
817 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) {
818 bp->b_flags |= B_CLUSTEROK;
819 cluster_write(vp, bp, ip->i_size, seqcount,
824 } else if (ioflag & IO_DIRECT) {
825 bp->b_flags |= B_CLUSTEROK;
828 bp->b_flags |= B_CLUSTEROK;
831 if (error || xfersize == 0)
833 ip->i_flag |= IN_CHANGE | IN_UPDATE;
836 * If we successfully wrote any data, and we are not the superuser
837 * we clear the setuid and setgid bits as a precaution against
840 if ((ip->i_mode & (ISUID | ISGID)) && resid > uio->uio_resid &&
842 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID, 0)) {
843 ip->i_mode &= ~(ISUID | ISGID);
844 DIP_SET(ip, i_mode, ip->i_mode);
848 if (ioflag & IO_UNIT) {
849 (void)ffs_truncate(vp, osize,
850 IO_NORMAL | (ioflag & IO_SYNC), ap->a_cred);
851 uio->uio_offset -= resid - uio->uio_resid;
852 uio->uio_resid = resid;
854 } else if (resid > uio->uio_resid && (ioflag & IO_SYNC))
855 error = ffs_update(vp, 1);
860 * Extended attribute area reading.
863 ffs_extread(struct vnode *vp, struct uio *uio, int ioflag)
866 struct ufs2_dinode *dp;
869 ufs_lbn_t lbn, nextlbn;
871 long size, xfersize, blkoffset;
880 if (uio->uio_rw != UIO_READ || fs->fs_magic != FS_UFS2_MAGIC)
881 panic("ffs_extread: mode");
884 orig_resid = uio->uio_resid;
885 KASSERT(orig_resid >= 0, ("ffs_extread: uio->uio_resid < 0"));
888 KASSERT(uio->uio_offset >= 0, ("ffs_extread: uio->uio_offset < 0"));
890 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) {
891 if ((bytesinfile = dp->di_extsize - uio->uio_offset) <= 0)
893 lbn = lblkno(fs, uio->uio_offset);
897 * size of buffer. The buffer representing the
898 * end of the file is rounded up to the size of
899 * the block type ( fragment or full block,
902 size = sblksize(fs, dp->di_extsize, lbn);
903 blkoffset = blkoff(fs, uio->uio_offset);
906 * The amount we want to transfer in this iteration is
907 * one FS block less the amount of the data before
908 * our startpoint (duh!)
910 xfersize = fs->fs_bsize - blkoffset;
913 * But if we actually want less than the block,
914 * or the file doesn't have a whole block more of data,
915 * then use the lesser number.
917 if (uio->uio_resid < xfersize)
918 xfersize = uio->uio_resid;
919 if (bytesinfile < xfersize)
920 xfersize = bytesinfile;
922 if (lblktosize(fs, nextlbn) >= dp->di_extsize) {
924 * Don't do readahead if this is the end of the info.
926 error = bread(vp, -1 - lbn, size, NOCRED, &bp);
929 * If we have a second block, then
930 * fire off a request for a readahead
931 * as well as a read. Note that the 4th and 5th
932 * arguments point to arrays of the size specified in
935 u_int nextsize = sblksize(fs, dp->di_extsize, nextlbn);
937 nextlbn = -1 - nextlbn;
938 error = breadn(vp, -1 - lbn,
939 size, &nextlbn, &nextsize, 1, NOCRED, &bp);
948 * We should only get non-zero b_resid when an I/O error
949 * has occurred, which should cause us to break above.
950 * However, if the short read did not cause an error,
951 * then we want to ensure that we do not uiomove bad
952 * or uninitialized data.
955 if (size < xfersize) {
961 error = uiomove((char *)bp->b_data + blkoffset,
965 vfs_bio_brelse(bp, ioflag);
969 * This can only happen in the case of an error
970 * because the loop above resets bp to NULL on each iteration
971 * and on normal completion has not set a new value into it.
972 * so it must have come from a 'break' statement
975 vfs_bio_brelse(bp, ioflag);
980 * Extended attribute area writing.
983 ffs_extwrite(struct vnode *vp, struct uio *uio, int ioflag, struct ucred *ucred)
986 struct ufs2_dinode *dp;
992 int blkoffset, error, flags, size, xfersize;
999 if (uio->uio_rw != UIO_WRITE || fs->fs_magic != FS_UFS2_MAGIC)
1000 panic("ffs_extwrite: mode");
1003 if (ioflag & IO_APPEND)
1004 uio->uio_offset = dp->di_extsize;
1005 KASSERT(uio->uio_offset >= 0, ("ffs_extwrite: uio->uio_offset < 0"));
1006 KASSERT(uio->uio_resid >= 0, ("ffs_extwrite: uio->uio_resid < 0"));
1007 if ((uoff_t)uio->uio_offset + uio->uio_resid >
1008 UFS_NXADDR * fs->fs_bsize)
1011 resid = uio->uio_resid;
1012 osize = dp->di_extsize;
1014 if (ioflag & IO_SYNC)
1017 for (error = 0; uio->uio_resid > 0;) {
1018 lbn = lblkno(fs, uio->uio_offset);
1019 blkoffset = blkoff(fs, uio->uio_offset);
1020 xfersize = fs->fs_bsize - blkoffset;
1021 if (uio->uio_resid < xfersize)
1022 xfersize = uio->uio_resid;
1025 * We must perform a read-before-write if the transfer size
1026 * does not cover the entire buffer.
1028 if (fs->fs_bsize > xfersize)
1031 flags &= ~BA_CLRBUF;
1032 error = UFS_BALLOC(vp, uio->uio_offset, xfersize,
1037 * If the buffer is not valid we have to clear out any
1038 * garbage data from the pages instantiated for the buffer.
1039 * If we do not, a failed uiomove() during a write can leave
1040 * the prior contents of the pages exposed to a userland
1041 * mmap(). XXX deal with uiomove() errors a better way.
1043 if ((bp->b_flags & B_CACHE) == 0 && fs->fs_bsize <= xfersize)
1046 if (uio->uio_offset + xfersize > dp->di_extsize)
1047 dp->di_extsize = uio->uio_offset + xfersize;
1049 size = sblksize(fs, dp->di_extsize, lbn) - bp->b_resid;
1050 if (size < xfersize)
1054 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio);
1056 vfs_bio_set_flags(bp, ioflag);
1059 * If IO_SYNC each buffer is written synchronously. Otherwise
1060 * if we have a severe page deficiency write the buffer
1061 * asynchronously. Otherwise try to cluster, and if that
1062 * doesn't do it then either do an async write (if O_DIRECT),
1063 * or a delayed write (if not).
1065 if (ioflag & IO_SYNC) {
1067 } else if (vm_page_count_severe() ||
1068 buf_dirty_count_severe() ||
1069 xfersize + blkoffset == fs->fs_bsize ||
1070 (ioflag & (IO_ASYNC | IO_DIRECT)))
1074 if (error || xfersize == 0)
1076 ip->i_flag |= IN_CHANGE;
1079 * If we successfully wrote any data, and we are not the superuser
1080 * we clear the setuid and setgid bits as a precaution against
1083 if ((ip->i_mode & (ISUID | ISGID)) && resid > uio->uio_resid && ucred) {
1084 if (priv_check_cred(ucred, PRIV_VFS_RETAINSUGID, 0)) {
1085 ip->i_mode &= ~(ISUID | ISGID);
1086 dp->di_mode = ip->i_mode;
1090 if (ioflag & IO_UNIT) {
1091 (void)ffs_truncate(vp, osize,
1092 IO_EXT | (ioflag&IO_SYNC), ucred);
1093 uio->uio_offset -= resid - uio->uio_resid;
1094 uio->uio_resid = resid;
1096 } else if (resid > uio->uio_resid && (ioflag & IO_SYNC))
1097 error = ffs_update(vp, 1);
1103 * Vnode operating to retrieve a named extended attribute.
1105 * Locate a particular EA (nspace:name) in the area (ptr:length), and return
1106 * the length of the EA, and possibly the pointer to the entry and to the data.
1109 ffs_findextattr(u_char *ptr, u_int length, int nspace, const char *name,
1110 struct extattr **eapp, u_char **eac)
1112 struct extattr *eap, *eaend;
1115 nlen = strlen(name);
1116 KASSERT(ALIGNED_TO(ptr, struct extattr), ("unaligned"));
1117 eap = (struct extattr *)ptr;
1118 eaend = (struct extattr *)(ptr + length);
1119 for (; eap < eaend; eap = EXTATTR_NEXT(eap)) {
1120 /* make sure this entry is complete */
1121 if (EXTATTR_NEXT(eap) > eaend)
1123 if (eap->ea_namespace != nspace || eap->ea_namelength != nlen
1124 || memcmp(eap->ea_name, name, nlen) != 0)
1129 *eac = EXTATTR_CONTENT(eap);
1130 return (EXTATTR_CONTENT_SIZE(eap));
1136 ffs_rdextattr(u_char **p, struct vnode *vp, struct thread *td, int extra)
1139 struct ufs2_dinode *dp;
1142 struct iovec liovec;
1150 easize = dp->di_extsize;
1151 if ((uoff_t)easize + extra > UFS_NXADDR * fs->fs_bsize)
1154 eae = malloc(easize + extra, M_TEMP, M_WAITOK);
1156 liovec.iov_base = eae;
1157 liovec.iov_len = easize;
1158 luio.uio_iov = &liovec;
1159 luio.uio_iovcnt = 1;
1160 luio.uio_offset = 0;
1161 luio.uio_resid = easize;
1162 luio.uio_segflg = UIO_SYSSPACE;
1163 luio.uio_rw = UIO_READ;
1166 error = ffs_extread(vp, &luio, IO_EXT | IO_SYNC);
1176 ffs_lock_ea(struct vnode *vp)
1182 while (ip->i_flag & IN_EA_LOCKED) {
1183 ip->i_flag |= IN_EA_LOCKWAIT;
1184 msleep(&ip->i_ea_refs, &vp->v_interlock, PINOD + 2, "ufs_ea",
1187 ip->i_flag |= IN_EA_LOCKED;
1192 ffs_unlock_ea(struct vnode *vp)
1198 if (ip->i_flag & IN_EA_LOCKWAIT)
1199 wakeup(&ip->i_ea_refs);
1200 ip->i_flag &= ~(IN_EA_LOCKED | IN_EA_LOCKWAIT);
1205 ffs_open_ea(struct vnode *vp, struct ucred *cred, struct thread *td)
1208 struct ufs2_dinode *dp;
1214 if (ip->i_ea_area != NULL) {
1220 error = ffs_rdextattr(&ip->i_ea_area, vp, td, 0);
1225 ip->i_ea_len = dp->di_extsize;
1233 * Vnode extattr transaction commit/abort
1236 ffs_close_ea(struct vnode *vp, int commit, struct ucred *cred, struct thread *td)
1240 struct iovec liovec;
1242 struct ufs2_dinode *dp;
1247 if (ip->i_ea_area == NULL) {
1252 error = ip->i_ea_error;
1253 if (commit && error == 0) {
1254 ASSERT_VOP_ELOCKED(vp, "ffs_close_ea commit");
1256 cred = vp->v_mount->mnt_cred;
1257 liovec.iov_base = ip->i_ea_area;
1258 liovec.iov_len = ip->i_ea_len;
1259 luio.uio_iov = &liovec;
1260 luio.uio_iovcnt = 1;
1261 luio.uio_offset = 0;
1262 luio.uio_resid = ip->i_ea_len;
1263 luio.uio_segflg = UIO_SYSSPACE;
1264 luio.uio_rw = UIO_WRITE;
1266 /* XXX: I'm not happy about truncating to zero size */
1267 if (ip->i_ea_len < dp->di_extsize)
1268 error = ffs_truncate(vp, 0, IO_EXT, cred);
1269 error = ffs_extwrite(vp, &luio, IO_EXT | IO_SYNC, cred);
1271 if (--ip->i_ea_refs == 0) {
1272 free(ip->i_ea_area, M_TEMP);
1273 ip->i_ea_area = NULL;
1282 * Vnode extattr strategy routine for fifos.
1284 * We need to check for a read or write of the external attributes.
1285 * Otherwise we just fall through and do the usual thing.
1288 ffsext_strategy(struct vop_strategy_args *ap)
1290 struct vop_strategy_args {
1291 struct vnodeop_desc *a_desc;
1301 lbn = ap->a_bp->b_lblkno;
1302 if (I_IS_UFS2(VTOI(vp)) && lbn < 0 && lbn >= -UFS_NXADDR)
1303 return (VOP_STRATEGY_APV(&ufs_vnodeops, ap));
1304 if (vp->v_type == VFIFO)
1305 return (VOP_STRATEGY_APV(&ufs_fifoops, ap));
1306 panic("spec nodes went here");
1310 * Vnode extattr transaction commit/abort
1313 ffs_openextattr(struct vop_openextattr_args *ap)
1315 struct vop_openextattr_args {
1316 struct vnodeop_desc *a_desc;
1318 IN struct ucred *a_cred;
1319 IN struct thread *a_td;
1324 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK)
1325 return (EOPNOTSUPP);
1327 return (ffs_open_ea(ap->a_vp, ap->a_cred, ap->a_td));
1332 * Vnode extattr transaction commit/abort
1335 ffs_closeextattr(struct vop_closeextattr_args *ap)
1337 struct vop_closeextattr_args {
1338 struct vnodeop_desc *a_desc;
1341 IN struct ucred *a_cred;
1342 IN struct thread *a_td;
1347 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK)
1348 return (EOPNOTSUPP);
1350 if (ap->a_commit && (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY))
1353 return (ffs_close_ea(ap->a_vp, ap->a_commit, ap->a_cred, ap->a_td));
1357 * Vnode operation to remove a named attribute.
1360 ffs_deleteextattr(struct vop_deleteextattr_args *ap)
1363 IN struct vnode *a_vp;
1364 IN int a_attrnamespace;
1365 IN const char *a_name;
1366 IN struct ucred *a_cred;
1367 IN struct thread *a_td;
1372 struct extattr *eap;
1374 int olen, error, i, easize;
1378 ip = VTOI(ap->a_vp);
1380 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK)
1381 return (EOPNOTSUPP);
1383 if (strlen(ap->a_name) == 0)
1386 if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY)
1389 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
1390 ap->a_cred, ap->a_td, VWRITE);
1394 * ffs_lock_ea is not needed there, because the vnode
1395 * must be exclusively locked.
1397 if (ip->i_ea_area != NULL && ip->i_ea_error == 0)
1398 ip->i_ea_error = error;
1402 error = ffs_open_ea(ap->a_vp, ap->a_cred, ap->a_td);
1406 /* CEM: delete could be done in-place instead */
1407 eae = malloc(ip->i_ea_len, M_TEMP, M_WAITOK);
1408 bcopy(ip->i_ea_area, eae, ip->i_ea_len);
1409 easize = ip->i_ea_len;
1411 olen = ffs_findextattr(eae, easize, ap->a_attrnamespace, ap->a_name,
1414 /* delete but nonexistent */
1416 ffs_close_ea(ap->a_vp, 0, ap->a_cred, ap->a_td);
1419 ul = eap->ea_length;
1420 i = (u_char *)EXTATTR_NEXT(eap) - eae;
1421 bcopy(EXTATTR_NEXT(eap), eap, easize - i);
1424 tmp = ip->i_ea_area;
1425 ip->i_ea_area = eae;
1426 ip->i_ea_len = easize;
1428 error = ffs_close_ea(ap->a_vp, 1, ap->a_cred, ap->a_td);
1433 * Vnode operation to retrieve a named extended attribute.
1436 ffs_getextattr(struct vop_getextattr_args *ap)
1439 IN struct vnode *a_vp;
1440 IN int a_attrnamespace;
1441 IN const char *a_name;
1442 INOUT struct uio *a_uio;
1444 IN struct ucred *a_cred;
1445 IN struct thread *a_td;
1454 ip = VTOI(ap->a_vp);
1456 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK)
1457 return (EOPNOTSUPP);
1459 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
1460 ap->a_cred, ap->a_td, VREAD);
1464 error = ffs_open_ea(ap->a_vp, ap->a_cred, ap->a_td);
1468 eae = ip->i_ea_area;
1469 easize = ip->i_ea_len;
1471 ealen = ffs_findextattr(eae, easize, ap->a_attrnamespace, ap->a_name,
1475 if (ap->a_size != NULL)
1476 *ap->a_size = ealen;
1477 else if (ap->a_uio != NULL)
1478 error = uiomove(p, ealen, ap->a_uio);
1482 ffs_close_ea(ap->a_vp, 0, ap->a_cred, ap->a_td);
1487 * Vnode operation to retrieve extended attributes on a vnode.
1490 ffs_listextattr(struct vop_listextattr_args *ap)
1493 IN struct vnode *a_vp;
1494 IN int a_attrnamespace;
1495 INOUT struct uio *a_uio;
1497 IN struct ucred *a_cred;
1498 IN struct thread *a_td;
1503 struct extattr *eap, *eaend;
1506 ip = VTOI(ap->a_vp);
1508 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK)
1509 return (EOPNOTSUPP);
1511 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
1512 ap->a_cred, ap->a_td, VREAD);
1516 error = ffs_open_ea(ap->a_vp, ap->a_cred, ap->a_td);
1521 if (ap->a_size != NULL)
1524 KASSERT(ALIGNED_TO(ip->i_ea_area, struct extattr), ("unaligned"));
1525 eap = (struct extattr *)ip->i_ea_area;
1526 eaend = (struct extattr *)(ip->i_ea_area + ip->i_ea_len);
1527 for (; error == 0 && eap < eaend; eap = EXTATTR_NEXT(eap)) {
1528 /* make sure this entry is complete */
1529 if (EXTATTR_NEXT(eap) > eaend)
1531 if (eap->ea_namespace != ap->a_attrnamespace)
1534 ealen = eap->ea_namelength;
1535 if (ap->a_size != NULL)
1536 *ap->a_size += ealen + 1;
1537 else if (ap->a_uio != NULL)
1538 error = uiomove(&eap->ea_namelength, ealen + 1,
1542 ffs_close_ea(ap->a_vp, 0, ap->a_cred, ap->a_td);
1547 * Vnode operation to set a named attribute.
1550 ffs_setextattr(struct vop_setextattr_args *ap)
1553 IN struct vnode *a_vp;
1554 IN int a_attrnamespace;
1555 IN const char *a_name;
1556 INOUT struct uio *a_uio;
1557 IN struct ucred *a_cred;
1558 IN struct thread *a_td;
1564 struct extattr *eap;
1565 uint32_t ealength, ul;
1567 int olen, eapad1, eapad2, error, i, easize;
1571 ip = VTOI(ap->a_vp);
1574 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK)
1575 return (EOPNOTSUPP);
1577 if (strlen(ap->a_name) == 0)
1580 /* XXX Now unsupported API to delete EAs using NULL uio. */
1581 if (ap->a_uio == NULL)
1582 return (EOPNOTSUPP);
1584 if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY)
1587 ealen = ap->a_uio->uio_resid;
1588 if (ealen < 0 || ealen > lblktosize(fs, UFS_NXADDR))
1591 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
1592 ap->a_cred, ap->a_td, VWRITE);
1596 * ffs_lock_ea is not needed there, because the vnode
1597 * must be exclusively locked.
1599 if (ip->i_ea_area != NULL && ip->i_ea_error == 0)
1600 ip->i_ea_error = error;
1604 error = ffs_open_ea(ap->a_vp, ap->a_cred, ap->a_td);
1608 ealength = sizeof(uint32_t) + 3 + strlen(ap->a_name);
1609 eapad1 = roundup2(ealength, 8) - ealength;
1610 eapad2 = roundup2(ealen, 8) - ealen;
1611 ealength += eapad1 + ealen + eapad2;
1614 * CEM: rewrites of the same size or smaller could be done in-place
1615 * instead. (We don't acquire any fine-grained locks in here either,
1616 * so we could also do bigger writes in-place.)
1618 eae = malloc(ip->i_ea_len + ealength, M_TEMP, M_WAITOK);
1619 bcopy(ip->i_ea_area, eae, ip->i_ea_len);
1620 easize = ip->i_ea_len;
1622 olen = ffs_findextattr(eae, easize, ap->a_attrnamespace, ap->a_name,
1625 /* new, append at end */
1626 KASSERT(ALIGNED_TO(eae + easize, struct extattr),
1628 eap = (struct extattr *)(eae + easize);
1631 ul = eap->ea_length;
1632 i = (u_char *)EXTATTR_NEXT(eap) - eae;
1633 if (ul != ealength) {
1634 bcopy(EXTATTR_NEXT(eap), (u_char *)eap + ealength,
1636 easize += (ealength - ul);
1639 if (easize > lblktosize(fs, UFS_NXADDR)) {
1641 ffs_close_ea(ap->a_vp, 0, ap->a_cred, ap->a_td);
1642 if (ip->i_ea_area != NULL && ip->i_ea_error == 0)
1643 ip->i_ea_error = ENOSPC;
1646 eap->ea_length = ealength;
1647 eap->ea_namespace = ap->a_attrnamespace;
1648 eap->ea_contentpadlen = eapad2;
1649 eap->ea_namelength = strlen(ap->a_name);
1650 memcpy(eap->ea_name, ap->a_name, strlen(ap->a_name));
1651 bzero(&eap->ea_name[strlen(ap->a_name)], eapad1);
1652 error = uiomove(EXTATTR_CONTENT(eap), ealen, ap->a_uio);
1655 ffs_close_ea(ap->a_vp, 0, ap->a_cred, ap->a_td);
1656 if (ip->i_ea_area != NULL && ip->i_ea_error == 0)
1657 ip->i_ea_error = error;
1660 bzero((u_char *)EXTATTR_CONTENT(eap) + ealen, eapad2);
1662 tmp = ip->i_ea_area;
1663 ip->i_ea_area = eae;
1664 ip->i_ea_len = easize;
1666 error = ffs_close_ea(ap->a_vp, 1, ap->a_cred, ap->a_td);
1671 * Vnode pointer to File handle
1674 ffs_vptofh(struct vop_vptofh_args *ap)
1677 IN struct vnode *a_vp;
1678 IN struct fid *a_fhp;
1685 ip = VTOI(ap->a_vp);
1686 ufhp = (struct ufid *)ap->a_fhp;
1687 ufhp->ufid_len = sizeof(struct ufid);
1688 ufhp->ufid_ino = ip->i_number;
1689 ufhp->ufid_gen = ip->i_gen;
1693 SYSCTL_DECL(_vfs_ffs);
1694 static int use_buf_pager = 1;
1695 SYSCTL_INT(_vfs_ffs, OID_AUTO, use_buf_pager, CTLFLAG_RWTUN, &use_buf_pager, 0,
1696 "Always use buffer pager instead of bmap");
1699 ffs_gbp_getblkno(struct vnode *vp, vm_ooffset_t off)
1702 return (lblkno(VFSTOUFS(vp->v_mount)->um_fs, off));
1706 ffs_gbp_getblksz(struct vnode *vp, daddr_t lbn)
1709 return (blksize(VFSTOUFS(vp->v_mount)->um_fs, VTOI(vp), lbn));
1713 ffs_getpages(struct vop_getpages_args *ap)
1716 struct ufsmount *um;
1719 um = VFSTOUFS(vp->v_mount);
1721 if (!use_buf_pager && um->um_devvp->v_bufobj.bo_bsize <= PAGE_SIZE)
1722 return (vnode_pager_generic_getpages(vp, ap->a_m, ap->a_count,
1723 ap->a_rbehind, ap->a_rahead, NULL, NULL));
1724 return (vfs_bio_getpages(vp, ap->a_m, ap->a_count, ap->a_rbehind,
1725 ap->a_rahead, ffs_gbp_getblkno, ffs_gbp_getblksz));