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
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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
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38 * modification, are permitted provided that the following conditions
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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)
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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_getpages_async_t ffs_getpages_async;
115 static vop_lock1_t ffs_lock;
116 static vop_read_t ffs_read;
117 static vop_write_t ffs_write;
118 static int ffs_extread(struct vnode *vp, struct uio *uio, int ioflag);
119 static int ffs_extwrite(struct vnode *vp, struct uio *uio, int ioflag,
121 static vop_strategy_t ffsext_strategy;
122 static vop_closeextattr_t ffs_closeextattr;
123 static vop_deleteextattr_t ffs_deleteextattr;
124 static vop_getextattr_t ffs_getextattr;
125 static vop_listextattr_t ffs_listextattr;
126 static vop_openextattr_t ffs_openextattr;
127 static vop_setextattr_t ffs_setextattr;
128 static vop_vptofh_t ffs_vptofh;
130 /* Global vfs data structures for ufs. */
131 struct vop_vector ffs_vnodeops1 = {
132 .vop_default = &ufs_vnodeops,
133 .vop_fsync = ffs_fsync,
134 .vop_fdatasync = ffs_fdatasync,
135 .vop_getpages = ffs_getpages,
136 .vop_getpages_async = ffs_getpages_async,
137 .vop_lock1 = ffs_lock,
138 .vop_read = ffs_read,
139 .vop_reallocblks = ffs_reallocblks,
140 .vop_write = ffs_write,
141 .vop_vptofh = ffs_vptofh,
144 struct vop_vector ffs_fifoops1 = {
145 .vop_default = &ufs_fifoops,
146 .vop_fsync = ffs_fsync,
147 .vop_fdatasync = ffs_fdatasync,
148 .vop_lock1 = ffs_lock,
149 .vop_vptofh = ffs_vptofh,
152 /* Global vfs data structures for ufs. */
153 struct vop_vector ffs_vnodeops2 = {
154 .vop_default = &ufs_vnodeops,
155 .vop_fsync = ffs_fsync,
156 .vop_fdatasync = ffs_fdatasync,
157 .vop_getpages = ffs_getpages,
158 .vop_getpages_async = ffs_getpages_async,
159 .vop_lock1 = ffs_lock,
160 .vop_read = ffs_read,
161 .vop_reallocblks = ffs_reallocblks,
162 .vop_write = ffs_write,
163 .vop_closeextattr = ffs_closeextattr,
164 .vop_deleteextattr = ffs_deleteextattr,
165 .vop_getextattr = ffs_getextattr,
166 .vop_listextattr = ffs_listextattr,
167 .vop_openextattr = ffs_openextattr,
168 .vop_setextattr = ffs_setextattr,
169 .vop_vptofh = ffs_vptofh,
172 struct vop_vector ffs_fifoops2 = {
173 .vop_default = &ufs_fifoops,
174 .vop_fsync = ffs_fsync,
175 .vop_fdatasync = ffs_fdatasync,
176 .vop_lock1 = ffs_lock,
177 .vop_reallocblks = ffs_reallocblks,
178 .vop_strategy = ffsext_strategy,
179 .vop_closeextattr = ffs_closeextattr,
180 .vop_deleteextattr = ffs_deleteextattr,
181 .vop_getextattr = ffs_getextattr,
182 .vop_listextattr = ffs_listextattr,
183 .vop_openextattr = ffs_openextattr,
184 .vop_setextattr = ffs_setextattr,
185 .vop_vptofh = ffs_vptofh,
189 * Synch an open file.
193 ffs_fsync(struct vop_fsync_args *ap)
202 error = ffs_syncvnode(vp, ap->a_waitfor, 0);
205 if (ap->a_waitfor == MNT_WAIT && DOINGSOFTDEP(vp)) {
206 error = softdep_fsync(vp);
211 * The softdep_fsync() function may drop vp lock,
212 * allowing for dirty buffers to reappear on the
213 * bo_dirty list. Recheck and resync as needed.
216 if ((vp->v_type == VREG || vp->v_type == VDIR) &&
217 (bo->bo_numoutput > 0 || bo->bo_dirty.bv_cnt > 0)) {
227 ffs_syncvnode(struct vnode *vp, int waitfor, int flags)
231 struct buf *bp, *nbp;
234 bool still_dirty, wait;
237 ip->i_flag &= ~IN_NEEDSYNC;
241 * When doing MNT_WAIT we must first flush all dependencies
244 if (DOINGSOFTDEP(vp) && waitfor == MNT_WAIT &&
245 (error = softdep_sync_metadata(vp)) != 0)
249 * Flush all dirty buffers associated with a vnode.
253 wait = false; /* Always do an async pass first. */
254 lbn = lblkno(ITOFS(ip), (ip->i_size + ITOFS(ip)->fs_bsize - 1));
257 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs)
258 bp->b_vflags &= ~BV_SCANNED;
259 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
261 * Reasons to skip this buffer: it has already been considered
262 * on this pass, the buffer has dependencies that will cause
263 * it to be redirtied and it has not already been deferred,
264 * or it is already being written.
266 if ((bp->b_vflags & BV_SCANNED) != 0)
268 bp->b_vflags |= BV_SCANNED;
270 * Flush indirects in order, if requested.
272 * Note that if only datasync is requested, we can
273 * skip indirect blocks when softupdates are not
274 * active. Otherwise we must flush them with data,
275 * since dependencies prevent data block writes.
277 if (waitfor == MNT_WAIT && bp->b_lblkno <= -UFS_NDADDR &&
278 (lbn_level(bp->b_lblkno) >= passes ||
279 ((flags & DATA_ONLY) != 0 && !DOINGSOFTDEP(vp))))
281 if (bp->b_lblkno > lbn)
282 panic("ffs_syncvnode: syncing truncated data.");
283 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL) == 0) {
287 LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK,
288 BO_LOCKPTR(bo)) != 0) {
289 bp->b_vflags &= ~BV_SCANNED;
294 if ((bp->b_flags & B_DELWRI) == 0)
295 panic("ffs_fsync: not dirty");
297 * Check for dependencies and potentially complete them.
299 if (!LIST_EMPTY(&bp->b_dep) &&
300 (error = softdep_sync_buf(vp, bp,
301 wait ? MNT_WAIT : MNT_NOWAIT)) != 0) {
303 if (error != EBUSY) {
307 /* If we deferred once, don't defer again. */
308 if ((bp->b_flags & B_DEFERRED) == 0) {
309 bp->b_flags |= B_DEFERRED;
316 if ((error = bwrite(bp)) != 0)
318 } else if ((bp->b_flags & B_CLUSTEROK)) {
319 (void) vfs_bio_awrite(bp);
326 * Since we may have slept during the I/O, we need
327 * to start from a known point.
330 nbp = TAILQ_FIRST(&bo->bo_dirty.bv_hd);
332 if (waitfor != MNT_WAIT) {
334 if ((flags & NO_INO_UPDT) != 0)
337 return (ffs_update(vp, 0));
339 /* Drain IO to see if we're done. */
340 bufobj_wwait(bo, 0, 0);
342 * Block devices associated with filesystems may have new I/O
343 * requests posted for them even if the vnode is locked, so no
344 * amount of trying will get them clean. We make several passes
347 * Regular files may need multiple passes to flush all dependency
348 * work as it is possible that we must write once per indirect
349 * level, once for the leaf, and once for the inode and each of
350 * these will be done with one sync and one async pass.
352 if (bo->bo_dirty.bv_cnt > 0) {
353 if ((flags & DATA_ONLY) == 0) {
357 * For data-only sync, dirty indirect buffers
361 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) {
362 if (bp->b_lblkno > -UFS_NDADDR) {
370 /* Write the inode after sync passes to flush deps. */
371 if (wait && DOINGSOFTDEP(vp) &&
372 (flags & NO_INO_UPDT) == 0) {
377 /* switch between sync/async. */
379 if (wait || ++passes < UFS_NIADDR + 2)
385 if ((flags & DATA_ONLY) == 0) {
386 if ((flags & NO_INO_UPDT) == 0)
387 error = ffs_update(vp, 1);
389 softdep_journal_fsync(VTOI(vp));
395 ffs_fdatasync(struct vop_fdatasync_args *ap)
398 return (ffs_syncvnode(ap->a_vp, MNT_WAIT, DATA_ONLY));
403 struct vop_lock1_args /* {
411 #ifndef NO_FFS_SNAPSHOT
417 switch (ap->a_flags & LK_TYPE_MASK) {
424 #ifdef DEBUG_VFS_LOCKS
425 KASSERT(vp->v_holdcnt != 0,
426 ("ffs_lock %p: zero hold count", vp));
429 result = _lockmgr_args(lkp, flags, VI_MTX(vp),
430 LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT,
431 ap->a_file, ap->a_line);
432 if (lkp == vp->v_vnlock || result != 0)
435 * Apparent success, except that the vnode
436 * mutated between snapshot file vnode and
437 * regular file vnode while this process
438 * slept. The lock currently held is not the
439 * right lock. Release it, and try to get the
442 (void) _lockmgr_args(lkp, LK_RELEASE, NULL,
443 LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT,
444 ap->a_file, ap->a_line);
445 if ((flags & (LK_INTERLOCK | LK_NOWAIT)) ==
446 (LK_INTERLOCK | LK_NOWAIT))
448 if ((flags & LK_TYPE_MASK) == LK_UPGRADE)
449 flags = (flags & ~LK_TYPE_MASK) | LK_EXCLUSIVE;
450 flags &= ~LK_INTERLOCK;
454 result = VOP_LOCK1_APV(&ufs_vnodeops, ap);
458 return (VOP_LOCK1_APV(&ufs_vnodeops, ap));
463 ffs_read_hole(struct uio *uio, long xfersize, long *size)
465 ssize_t saved_resid, tlen;
468 while (xfersize > 0) {
469 tlen = min(xfersize, ZERO_REGION_SIZE);
470 saved_resid = uio->uio_resid;
471 error = vn_io_fault_uiomove(__DECONST(void *, zero_region),
475 tlen = saved_resid - uio->uio_resid;
483 * Vnode op for reading.
487 struct vop_read_args /* {
491 struct ucred *a_cred;
499 ufs_lbn_t lbn, nextlbn;
501 long size, xfersize, blkoffset;
503 int bflag, error, ioflag, seqcount;
507 ioflag = ap->a_ioflag;
508 if (ap->a_ioflag & IO_EXT)
510 return (ffs_extread(vp, uio, ioflag));
512 panic("ffs_read+IO_EXT");
515 if ((ioflag & IO_DIRECT) != 0) {
518 error = ffs_rawread(vp, uio, &workdone);
519 if (error != 0 || workdone != 0)
524 seqcount = ap->a_ioflag >> IO_SEQSHIFT;
528 if (uio->uio_rw != UIO_READ)
529 panic("ffs_read: mode");
531 if (vp->v_type == VLNK) {
532 if ((int)ip->i_size < vp->v_mount->mnt_maxsymlinklen)
533 panic("ffs_read: short symlink");
534 } else if (vp->v_type != VREG && vp->v_type != VDIR)
535 panic("ffs_read: type %d", vp->v_type);
537 orig_resid = uio->uio_resid;
538 KASSERT(orig_resid >= 0, ("ffs_read: uio->uio_resid < 0"));
541 KASSERT(uio->uio_offset >= 0, ("ffs_read: uio->uio_offset < 0"));
543 if (uio->uio_offset < ip->i_size &&
544 uio->uio_offset >= fs->fs_maxfilesize)
547 bflag = GB_UNMAPPED | (uio->uio_segflg == UIO_NOCOPY ? 0 : GB_NOSPARSE);
548 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) {
549 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0)
551 lbn = lblkno(fs, uio->uio_offset);
555 * size of buffer. The buffer representing the
556 * end of the file is rounded up to the size of
557 * the block type ( fragment or full block,
560 size = blksize(fs, ip, lbn);
561 blkoffset = blkoff(fs, uio->uio_offset);
564 * The amount we want to transfer in this iteration is
565 * one FS block less the amount of the data before
566 * our startpoint (duh!)
568 xfersize = fs->fs_bsize - blkoffset;
571 * But if we actually want less than the block,
572 * or the file doesn't have a whole block more of data,
573 * then use the lesser number.
575 if (uio->uio_resid < xfersize)
576 xfersize = uio->uio_resid;
577 if (bytesinfile < xfersize)
578 xfersize = bytesinfile;
580 if (lblktosize(fs, nextlbn) >= ip->i_size) {
582 * Don't do readahead if this is the end of the file.
584 error = bread_gb(vp, lbn, size, NOCRED, bflag, &bp);
585 } else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) {
587 * Otherwise if we are allowed to cluster,
588 * grab as much as we can.
590 * XXX This may not be a win if we are not
591 * doing sequential access.
593 error = cluster_read(vp, ip->i_size, lbn,
594 size, NOCRED, blkoffset + uio->uio_resid,
595 seqcount, bflag, &bp);
596 } else if (seqcount > 1) {
598 * If we are NOT allowed to cluster, then
599 * if we appear to be acting sequentially,
600 * fire off a request for a readahead
601 * as well as a read. Note that the 4th and 5th
602 * arguments point to arrays of the size specified in
605 u_int nextsize = blksize(fs, ip, nextlbn);
606 error = breadn_flags(vp, lbn, size, &nextlbn,
607 &nextsize, 1, NOCRED, bflag, NULL, &bp);
610 * Failing all of the above, just read what the
611 * user asked for. Interestingly, the same as
612 * the first option above.
614 error = bread_gb(vp, lbn, size, NOCRED, bflag, &bp);
616 if (error == EJUSTRETURN) {
617 error = ffs_read_hole(uio, xfersize, &size);
628 * We should only get non-zero b_resid when an I/O error
629 * has occurred, which should cause us to break above.
630 * However, if the short read did not cause an error,
631 * then we want to ensure that we do not uiomove bad
632 * or uninitialized data.
635 if (size < xfersize) {
641 if (buf_mapped(bp)) {
642 error = vn_io_fault_uiomove((char *)bp->b_data +
643 blkoffset, (int)xfersize, uio);
645 error = vn_io_fault_pgmove(bp->b_pages, blkoffset,
651 vfs_bio_brelse(bp, ioflag);
655 * This can only happen in the case of an error
656 * because the loop above resets bp to NULL on each iteration
657 * and on normal completion has not set a new value into it.
658 * so it must have come from a 'break' statement
661 vfs_bio_brelse(bp, ioflag);
663 if ((error == 0 || uio->uio_resid != orig_resid) &&
664 (vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0 &&
665 (ip->i_flag & IN_ACCESS) == 0) {
667 ip->i_flag |= IN_ACCESS;
674 * Vnode op for writing.
678 struct vop_write_args /* {
682 struct ucred *a_cred;
694 int blkoffset, error, flags, ioflag, size, xfersize;
698 ioflag = ap->a_ioflag;
699 if (ap->a_ioflag & IO_EXT)
701 return (ffs_extwrite(vp, uio, ioflag, ap->a_cred));
703 panic("ffs_write+IO_EXT");
706 seqcount = ap->a_ioflag >> IO_SEQSHIFT;
710 if (uio->uio_rw != UIO_WRITE)
711 panic("ffs_write: mode");
714 switch (vp->v_type) {
716 if (ioflag & IO_APPEND)
717 uio->uio_offset = ip->i_size;
718 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size)
724 panic("ffs_write: dir write");
727 panic("ffs_write: type %p %d (%d,%d)", vp, (int)vp->v_type,
728 (int)uio->uio_offset,
733 KASSERT(uio->uio_resid >= 0, ("ffs_write: uio->uio_resid < 0"));
734 KASSERT(uio->uio_offset >= 0, ("ffs_write: uio->uio_offset < 0"));
736 if ((uoff_t)uio->uio_offset + uio->uio_resid > fs->fs_maxfilesize)
739 * Maybe this should be above the vnode op call, but so long as
740 * file servers have no limits, I don't think it matters.
742 if (vn_rlimit_fsize(vp, uio, uio->uio_td))
745 resid = uio->uio_resid;
747 if (seqcount > BA_SEQMAX)
748 flags = BA_SEQMAX << BA_SEQSHIFT;
750 flags = seqcount << BA_SEQSHIFT;
751 if (ioflag & IO_SYNC)
753 flags |= BA_UNMAPPED;
755 for (error = 0; uio->uio_resid > 0;) {
756 lbn = lblkno(fs, uio->uio_offset);
757 blkoffset = blkoff(fs, uio->uio_offset);
758 xfersize = fs->fs_bsize - blkoffset;
759 if (uio->uio_resid < xfersize)
760 xfersize = uio->uio_resid;
761 if (uio->uio_offset + xfersize > ip->i_size)
762 vnode_pager_setsize(vp, uio->uio_offset + xfersize);
765 * We must perform a read-before-write if the transfer size
766 * does not cover the entire buffer.
768 if (fs->fs_bsize > xfersize)
772 /* XXX is uio->uio_offset the right thing here? */
773 error = UFS_BALLOC(vp, uio->uio_offset, xfersize,
774 ap->a_cred, flags, &bp);
776 vnode_pager_setsize(vp, ip->i_size);
779 if ((ioflag & (IO_SYNC|IO_INVAL)) == (IO_SYNC|IO_INVAL))
780 bp->b_flags |= B_NOCACHE;
782 if (uio->uio_offset + xfersize > ip->i_size) {
783 ip->i_size = uio->uio_offset + xfersize;
784 DIP_SET(ip, i_size, ip->i_size);
787 size = blksize(fs, ip, lbn) - bp->b_resid;
791 if (buf_mapped(bp)) {
792 error = vn_io_fault_uiomove((char *)bp->b_data +
793 blkoffset, (int)xfersize, uio);
795 error = vn_io_fault_pgmove(bp->b_pages, blkoffset,
799 * If the buffer is not already filled and we encounter an
800 * error while trying to fill it, we have to clear out any
801 * garbage data from the pages instantiated for the buffer.
802 * If we do not, a failed uiomove() during a write can leave
803 * the prior contents of the pages exposed to a userland mmap.
805 * Note that we need only clear buffers with a transfer size
806 * equal to the block size because buffers with a shorter
807 * transfer size were cleared above by the call to UFS_BALLOC()
808 * with the BA_CLRBUF flag set.
810 * If the source region for uiomove identically mmaps the
811 * buffer, uiomove() performed the NOP copy, and the buffer
812 * content remains valid because the page fault handler
813 * validated the pages.
815 if (error != 0 && (bp->b_flags & B_CACHE) == 0 &&
816 fs->fs_bsize == xfersize)
819 vfs_bio_set_flags(bp, ioflag);
822 * If IO_SYNC each buffer is written synchronously. Otherwise
823 * if we have a severe page deficiency write the buffer
824 * asynchronously. Otherwise try to cluster, and if that
825 * doesn't do it then either do an async write (if O_DIRECT),
826 * or a delayed write (if not).
828 if (ioflag & IO_SYNC) {
830 } else if (vm_page_count_severe() ||
831 buf_dirty_count_severe() ||
832 (ioflag & IO_ASYNC)) {
833 bp->b_flags |= B_CLUSTEROK;
835 } else if (xfersize + blkoffset == fs->fs_bsize) {
836 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) {
837 bp->b_flags |= B_CLUSTEROK;
838 cluster_write(vp, bp, ip->i_size, seqcount,
843 } else if (ioflag & IO_DIRECT) {
844 bp->b_flags |= B_CLUSTEROK;
847 bp->b_flags |= B_CLUSTEROK;
850 if (error || xfersize == 0)
852 ip->i_flag |= IN_CHANGE | IN_UPDATE;
855 * If we successfully wrote any data, and we are not the superuser
856 * we clear the setuid and setgid bits as a precaution against
859 if ((ip->i_mode & (ISUID | ISGID)) && resid > uio->uio_resid &&
861 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID)) {
862 ip->i_mode &= ~(ISUID | ISGID);
863 DIP_SET(ip, i_mode, ip->i_mode);
867 if (ioflag & IO_UNIT) {
868 (void)ffs_truncate(vp, osize,
869 IO_NORMAL | (ioflag & IO_SYNC), ap->a_cred);
870 uio->uio_offset -= resid - uio->uio_resid;
871 uio->uio_resid = resid;
873 } else if (resid > uio->uio_resid && (ioflag & IO_SYNC))
874 error = ffs_update(vp, 1);
879 * Extended attribute area reading.
882 ffs_extread(struct vnode *vp, struct uio *uio, int ioflag)
885 struct ufs2_dinode *dp;
888 ufs_lbn_t lbn, nextlbn;
890 long size, xfersize, blkoffset;
899 if (uio->uio_rw != UIO_READ || fs->fs_magic != FS_UFS2_MAGIC)
900 panic("ffs_extread: mode");
903 orig_resid = uio->uio_resid;
904 KASSERT(orig_resid >= 0, ("ffs_extread: uio->uio_resid < 0"));
907 KASSERT(uio->uio_offset >= 0, ("ffs_extread: uio->uio_offset < 0"));
909 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) {
910 if ((bytesinfile = dp->di_extsize - uio->uio_offset) <= 0)
912 lbn = lblkno(fs, uio->uio_offset);
916 * size of buffer. The buffer representing the
917 * end of the file is rounded up to the size of
918 * the block type ( fragment or full block,
921 size = sblksize(fs, dp->di_extsize, lbn);
922 blkoffset = blkoff(fs, uio->uio_offset);
925 * The amount we want to transfer in this iteration is
926 * one FS block less the amount of the data before
927 * our startpoint (duh!)
929 xfersize = fs->fs_bsize - blkoffset;
932 * But if we actually want less than the block,
933 * or the file doesn't have a whole block more of data,
934 * then use the lesser number.
936 if (uio->uio_resid < xfersize)
937 xfersize = uio->uio_resid;
938 if (bytesinfile < xfersize)
939 xfersize = bytesinfile;
941 if (lblktosize(fs, nextlbn) >= dp->di_extsize) {
943 * Don't do readahead if this is the end of the info.
945 error = bread(vp, -1 - lbn, size, NOCRED, &bp);
948 * If we have a second block, then
949 * fire off a request for a readahead
950 * as well as a read. Note that the 4th and 5th
951 * arguments point to arrays of the size specified in
954 u_int nextsize = sblksize(fs, dp->di_extsize, nextlbn);
956 nextlbn = -1 - nextlbn;
957 error = breadn(vp, -1 - lbn,
958 size, &nextlbn, &nextsize, 1, NOCRED, &bp);
967 * We should only get non-zero b_resid when an I/O error
968 * has occurred, which should cause us to break above.
969 * However, if the short read did not cause an error,
970 * then we want to ensure that we do not uiomove bad
971 * or uninitialized data.
974 if (size < xfersize) {
980 error = uiomove((char *)bp->b_data + blkoffset,
984 vfs_bio_brelse(bp, ioflag);
988 * This can only happen in the case of an error
989 * because the loop above resets bp to NULL on each iteration
990 * and on normal completion has not set a new value into it.
991 * so it must have come from a 'break' statement
994 vfs_bio_brelse(bp, ioflag);
999 * Extended attribute area writing.
1002 ffs_extwrite(struct vnode *vp, struct uio *uio, int ioflag, struct ucred *ucred)
1005 struct ufs2_dinode *dp;
1011 int blkoffset, error, flags, size, xfersize;
1018 if (uio->uio_rw != UIO_WRITE || fs->fs_magic != FS_UFS2_MAGIC)
1019 panic("ffs_extwrite: mode");
1022 if (ioflag & IO_APPEND)
1023 uio->uio_offset = dp->di_extsize;
1024 KASSERT(uio->uio_offset >= 0, ("ffs_extwrite: uio->uio_offset < 0"));
1025 KASSERT(uio->uio_resid >= 0, ("ffs_extwrite: uio->uio_resid < 0"));
1026 if ((uoff_t)uio->uio_offset + uio->uio_resid >
1027 UFS_NXADDR * fs->fs_bsize)
1030 resid = uio->uio_resid;
1031 osize = dp->di_extsize;
1033 if (ioflag & IO_SYNC)
1036 for (error = 0; uio->uio_resid > 0;) {
1037 lbn = lblkno(fs, uio->uio_offset);
1038 blkoffset = blkoff(fs, uio->uio_offset);
1039 xfersize = fs->fs_bsize - blkoffset;
1040 if (uio->uio_resid < xfersize)
1041 xfersize = uio->uio_resid;
1044 * We must perform a read-before-write if the transfer size
1045 * does not cover the entire buffer.
1047 if (fs->fs_bsize > xfersize)
1050 flags &= ~BA_CLRBUF;
1051 error = UFS_BALLOC(vp, uio->uio_offset, xfersize,
1056 * If the buffer is not valid we have to clear out any
1057 * garbage data from the pages instantiated for the buffer.
1058 * If we do not, a failed uiomove() during a write can leave
1059 * the prior contents of the pages exposed to a userland
1060 * mmap(). XXX deal with uiomove() errors a better way.
1062 if ((bp->b_flags & B_CACHE) == 0 && fs->fs_bsize <= xfersize)
1065 if (uio->uio_offset + xfersize > dp->di_extsize)
1066 dp->di_extsize = uio->uio_offset + xfersize;
1068 size = sblksize(fs, dp->di_extsize, lbn) - bp->b_resid;
1069 if (size < xfersize)
1073 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio);
1075 vfs_bio_set_flags(bp, ioflag);
1078 * If IO_SYNC each buffer is written synchronously. Otherwise
1079 * if we have a severe page deficiency write the buffer
1080 * asynchronously. Otherwise try to cluster, and if that
1081 * doesn't do it then either do an async write (if O_DIRECT),
1082 * or a delayed write (if not).
1084 if (ioflag & IO_SYNC) {
1086 } else if (vm_page_count_severe() ||
1087 buf_dirty_count_severe() ||
1088 xfersize + blkoffset == fs->fs_bsize ||
1089 (ioflag & (IO_ASYNC | IO_DIRECT)))
1093 if (error || xfersize == 0)
1095 ip->i_flag |= IN_CHANGE;
1098 * If we successfully wrote any data, and we are not the superuser
1099 * we clear the setuid and setgid bits as a precaution against
1102 if ((ip->i_mode & (ISUID | ISGID)) && resid > uio->uio_resid && ucred) {
1103 if (priv_check_cred(ucred, PRIV_VFS_RETAINSUGID)) {
1104 ip->i_mode &= ~(ISUID | ISGID);
1105 dp->di_mode = ip->i_mode;
1109 if (ioflag & IO_UNIT) {
1110 (void)ffs_truncate(vp, osize,
1111 IO_EXT | (ioflag&IO_SYNC), ucred);
1112 uio->uio_offset -= resid - uio->uio_resid;
1113 uio->uio_resid = resid;
1115 } else if (resid > uio->uio_resid && (ioflag & IO_SYNC))
1116 error = ffs_update(vp, 1);
1122 * Vnode operating to retrieve a named extended attribute.
1124 * Locate a particular EA (nspace:name) in the area (ptr:length), and return
1125 * the length of the EA, and possibly the pointer to the entry and to the data.
1128 ffs_findextattr(u_char *ptr, u_int length, int nspace, const char *name,
1129 struct extattr **eapp, u_char **eac)
1131 struct extattr *eap, *eaend;
1134 nlen = strlen(name);
1135 KASSERT(ALIGNED_TO(ptr, struct extattr), ("unaligned"));
1136 eap = (struct extattr *)ptr;
1137 eaend = (struct extattr *)(ptr + length);
1138 for (; eap < eaend; eap = EXTATTR_NEXT(eap)) {
1139 /* make sure this entry is complete */
1140 if (EXTATTR_NEXT(eap) > eaend)
1142 if (eap->ea_namespace != nspace || eap->ea_namelength != nlen
1143 || memcmp(eap->ea_name, name, nlen) != 0)
1148 *eac = EXTATTR_CONTENT(eap);
1149 return (EXTATTR_CONTENT_SIZE(eap));
1155 ffs_rdextattr(u_char **p, struct vnode *vp, struct thread *td, int extra)
1158 struct ufs2_dinode *dp;
1161 struct iovec liovec;
1169 easize = dp->di_extsize;
1170 if ((uoff_t)easize + extra > UFS_NXADDR * fs->fs_bsize)
1173 eae = malloc(easize + extra, M_TEMP, M_WAITOK);
1175 liovec.iov_base = eae;
1176 liovec.iov_len = easize;
1177 luio.uio_iov = &liovec;
1178 luio.uio_iovcnt = 1;
1179 luio.uio_offset = 0;
1180 luio.uio_resid = easize;
1181 luio.uio_segflg = UIO_SYSSPACE;
1182 luio.uio_rw = UIO_READ;
1185 error = ffs_extread(vp, &luio, IO_EXT | IO_SYNC);
1195 ffs_lock_ea(struct vnode *vp)
1201 while (ip->i_flag & IN_EA_LOCKED) {
1202 ip->i_flag |= IN_EA_LOCKWAIT;
1203 msleep(&ip->i_ea_refs, &vp->v_interlock, PINOD + 2, "ufs_ea",
1206 ip->i_flag |= IN_EA_LOCKED;
1211 ffs_unlock_ea(struct vnode *vp)
1217 if (ip->i_flag & IN_EA_LOCKWAIT)
1218 wakeup(&ip->i_ea_refs);
1219 ip->i_flag &= ~(IN_EA_LOCKED | IN_EA_LOCKWAIT);
1224 ffs_open_ea(struct vnode *vp, struct ucred *cred, struct thread *td)
1227 struct ufs2_dinode *dp;
1233 if (ip->i_ea_area != NULL) {
1239 error = ffs_rdextattr(&ip->i_ea_area, vp, td, 0);
1244 ip->i_ea_len = dp->di_extsize;
1252 * Vnode extattr transaction commit/abort
1255 ffs_close_ea(struct vnode *vp, int commit, struct ucred *cred, struct thread *td)
1259 struct iovec liovec;
1261 struct ufs2_dinode *dp;
1266 if (ip->i_ea_area == NULL) {
1271 error = ip->i_ea_error;
1272 if (commit && error == 0) {
1273 ASSERT_VOP_ELOCKED(vp, "ffs_close_ea commit");
1275 cred = vp->v_mount->mnt_cred;
1276 liovec.iov_base = ip->i_ea_area;
1277 liovec.iov_len = ip->i_ea_len;
1278 luio.uio_iov = &liovec;
1279 luio.uio_iovcnt = 1;
1280 luio.uio_offset = 0;
1281 luio.uio_resid = ip->i_ea_len;
1282 luio.uio_segflg = UIO_SYSSPACE;
1283 luio.uio_rw = UIO_WRITE;
1285 /* XXX: I'm not happy about truncating to zero size */
1286 if (ip->i_ea_len < dp->di_extsize)
1287 error = ffs_truncate(vp, 0, IO_EXT, cred);
1288 error = ffs_extwrite(vp, &luio, IO_EXT | IO_SYNC, cred);
1290 if (--ip->i_ea_refs == 0) {
1291 free(ip->i_ea_area, M_TEMP);
1292 ip->i_ea_area = NULL;
1301 * Vnode extattr strategy routine for fifos.
1303 * We need to check for a read or write of the external attributes.
1304 * Otherwise we just fall through and do the usual thing.
1307 ffsext_strategy(struct vop_strategy_args *ap)
1309 struct vop_strategy_args {
1310 struct vnodeop_desc *a_desc;
1320 lbn = ap->a_bp->b_lblkno;
1321 if (I_IS_UFS2(VTOI(vp)) && lbn < 0 && lbn >= -UFS_NXADDR)
1322 return (VOP_STRATEGY_APV(&ufs_vnodeops, ap));
1323 if (vp->v_type == VFIFO)
1324 return (VOP_STRATEGY_APV(&ufs_fifoops, ap));
1325 panic("spec nodes went here");
1329 * Vnode extattr transaction commit/abort
1332 ffs_openextattr(struct vop_openextattr_args *ap)
1334 struct vop_openextattr_args {
1335 struct vnodeop_desc *a_desc;
1337 IN struct ucred *a_cred;
1338 IN struct thread *a_td;
1343 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK)
1344 return (EOPNOTSUPP);
1346 return (ffs_open_ea(ap->a_vp, ap->a_cred, ap->a_td));
1351 * Vnode extattr transaction commit/abort
1354 ffs_closeextattr(struct vop_closeextattr_args *ap)
1356 struct vop_closeextattr_args {
1357 struct vnodeop_desc *a_desc;
1360 IN struct ucred *a_cred;
1361 IN struct thread *a_td;
1366 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK)
1367 return (EOPNOTSUPP);
1369 if (ap->a_commit && (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY))
1372 return (ffs_close_ea(ap->a_vp, ap->a_commit, ap->a_cred, ap->a_td));
1376 * Vnode operation to remove a named attribute.
1379 ffs_deleteextattr(struct vop_deleteextattr_args *ap)
1382 IN struct vnode *a_vp;
1383 IN int a_attrnamespace;
1384 IN const char *a_name;
1385 IN struct ucred *a_cred;
1386 IN struct thread *a_td;
1391 struct extattr *eap;
1393 int olen, error, i, easize;
1397 ip = VTOI(ap->a_vp);
1399 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK)
1400 return (EOPNOTSUPP);
1402 if (strlen(ap->a_name) == 0)
1405 if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY)
1408 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
1409 ap->a_cred, ap->a_td, VWRITE);
1413 * ffs_lock_ea is not needed there, because the vnode
1414 * must be exclusively locked.
1416 if (ip->i_ea_area != NULL && ip->i_ea_error == 0)
1417 ip->i_ea_error = error;
1421 error = ffs_open_ea(ap->a_vp, ap->a_cred, ap->a_td);
1425 /* CEM: delete could be done in-place instead */
1426 eae = malloc(ip->i_ea_len, M_TEMP, M_WAITOK);
1427 bcopy(ip->i_ea_area, eae, ip->i_ea_len);
1428 easize = ip->i_ea_len;
1430 olen = ffs_findextattr(eae, easize, ap->a_attrnamespace, ap->a_name,
1433 /* delete but nonexistent */
1435 ffs_close_ea(ap->a_vp, 0, ap->a_cred, ap->a_td);
1438 ul = eap->ea_length;
1439 i = (u_char *)EXTATTR_NEXT(eap) - eae;
1440 bcopy(EXTATTR_NEXT(eap), eap, easize - i);
1443 tmp = ip->i_ea_area;
1444 ip->i_ea_area = eae;
1445 ip->i_ea_len = easize;
1447 error = ffs_close_ea(ap->a_vp, 1, ap->a_cred, ap->a_td);
1452 * Vnode operation to retrieve a named extended attribute.
1455 ffs_getextattr(struct vop_getextattr_args *ap)
1458 IN struct vnode *a_vp;
1459 IN int a_attrnamespace;
1460 IN const char *a_name;
1461 INOUT struct uio *a_uio;
1463 IN struct ucred *a_cred;
1464 IN struct thread *a_td;
1473 ip = VTOI(ap->a_vp);
1475 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK)
1476 return (EOPNOTSUPP);
1478 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
1479 ap->a_cred, ap->a_td, VREAD);
1483 error = ffs_open_ea(ap->a_vp, ap->a_cred, ap->a_td);
1487 eae = ip->i_ea_area;
1488 easize = ip->i_ea_len;
1490 ealen = ffs_findextattr(eae, easize, ap->a_attrnamespace, ap->a_name,
1494 if (ap->a_size != NULL)
1495 *ap->a_size = ealen;
1496 else if (ap->a_uio != NULL)
1497 error = uiomove(p, ealen, ap->a_uio);
1501 ffs_close_ea(ap->a_vp, 0, ap->a_cred, ap->a_td);
1506 * Vnode operation to retrieve extended attributes on a vnode.
1509 ffs_listextattr(struct vop_listextattr_args *ap)
1512 IN struct vnode *a_vp;
1513 IN int a_attrnamespace;
1514 INOUT struct uio *a_uio;
1516 IN struct ucred *a_cred;
1517 IN struct thread *a_td;
1522 struct extattr *eap, *eaend;
1525 ip = VTOI(ap->a_vp);
1527 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK)
1528 return (EOPNOTSUPP);
1530 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
1531 ap->a_cred, ap->a_td, VREAD);
1535 error = ffs_open_ea(ap->a_vp, ap->a_cred, ap->a_td);
1540 if (ap->a_size != NULL)
1543 KASSERT(ALIGNED_TO(ip->i_ea_area, struct extattr), ("unaligned"));
1544 eap = (struct extattr *)ip->i_ea_area;
1545 eaend = (struct extattr *)(ip->i_ea_area + ip->i_ea_len);
1546 for (; error == 0 && eap < eaend; eap = EXTATTR_NEXT(eap)) {
1547 /* make sure this entry is complete */
1548 if (EXTATTR_NEXT(eap) > eaend)
1550 if (eap->ea_namespace != ap->a_attrnamespace)
1553 ealen = eap->ea_namelength;
1554 if (ap->a_size != NULL)
1555 *ap->a_size += ealen + 1;
1556 else if (ap->a_uio != NULL)
1557 error = uiomove(&eap->ea_namelength, ealen + 1,
1561 ffs_close_ea(ap->a_vp, 0, ap->a_cred, ap->a_td);
1566 * Vnode operation to set a named attribute.
1569 ffs_setextattr(struct vop_setextattr_args *ap)
1572 IN struct vnode *a_vp;
1573 IN int a_attrnamespace;
1574 IN const char *a_name;
1575 INOUT struct uio *a_uio;
1576 IN struct ucred *a_cred;
1577 IN struct thread *a_td;
1583 struct extattr *eap;
1584 uint32_t ealength, ul;
1586 int olen, eapad1, eapad2, error, i, easize;
1590 ip = VTOI(ap->a_vp);
1593 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK)
1594 return (EOPNOTSUPP);
1596 if (strlen(ap->a_name) == 0)
1599 /* XXX Now unsupported API to delete EAs using NULL uio. */
1600 if (ap->a_uio == NULL)
1601 return (EOPNOTSUPP);
1603 if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY)
1606 ealen = ap->a_uio->uio_resid;
1607 if (ealen < 0 || ealen > lblktosize(fs, UFS_NXADDR))
1610 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
1611 ap->a_cred, ap->a_td, VWRITE);
1615 * ffs_lock_ea is not needed there, because the vnode
1616 * must be exclusively locked.
1618 if (ip->i_ea_area != NULL && ip->i_ea_error == 0)
1619 ip->i_ea_error = error;
1623 error = ffs_open_ea(ap->a_vp, ap->a_cred, ap->a_td);
1627 ealength = sizeof(uint32_t) + 3 + strlen(ap->a_name);
1628 eapad1 = roundup2(ealength, 8) - ealength;
1629 eapad2 = roundup2(ealen, 8) - ealen;
1630 ealength += eapad1 + ealen + eapad2;
1633 * CEM: rewrites of the same size or smaller could be done in-place
1634 * instead. (We don't acquire any fine-grained locks in here either,
1635 * so we could also do bigger writes in-place.)
1637 eae = malloc(ip->i_ea_len + ealength, M_TEMP, M_WAITOK);
1638 bcopy(ip->i_ea_area, eae, ip->i_ea_len);
1639 easize = ip->i_ea_len;
1641 olen = ffs_findextattr(eae, easize, ap->a_attrnamespace, ap->a_name,
1644 /* new, append at end */
1645 KASSERT(ALIGNED_TO(eae + easize, struct extattr),
1647 eap = (struct extattr *)(eae + easize);
1650 ul = eap->ea_length;
1651 i = (u_char *)EXTATTR_NEXT(eap) - eae;
1652 if (ul != ealength) {
1653 bcopy(EXTATTR_NEXT(eap), (u_char *)eap + ealength,
1655 easize += (ealength - ul);
1658 if (easize > lblktosize(fs, UFS_NXADDR)) {
1660 ffs_close_ea(ap->a_vp, 0, ap->a_cred, ap->a_td);
1661 if (ip->i_ea_area != NULL && ip->i_ea_error == 0)
1662 ip->i_ea_error = ENOSPC;
1665 eap->ea_length = ealength;
1666 eap->ea_namespace = ap->a_attrnamespace;
1667 eap->ea_contentpadlen = eapad2;
1668 eap->ea_namelength = strlen(ap->a_name);
1669 memcpy(eap->ea_name, ap->a_name, strlen(ap->a_name));
1670 bzero(&eap->ea_name[strlen(ap->a_name)], eapad1);
1671 error = uiomove(EXTATTR_CONTENT(eap), ealen, ap->a_uio);
1674 ffs_close_ea(ap->a_vp, 0, ap->a_cred, ap->a_td);
1675 if (ip->i_ea_area != NULL && ip->i_ea_error == 0)
1676 ip->i_ea_error = error;
1679 bzero((u_char *)EXTATTR_CONTENT(eap) + ealen, eapad2);
1681 tmp = ip->i_ea_area;
1682 ip->i_ea_area = eae;
1683 ip->i_ea_len = easize;
1685 error = ffs_close_ea(ap->a_vp, 1, ap->a_cred, ap->a_td);
1690 * Vnode pointer to File handle
1693 ffs_vptofh(struct vop_vptofh_args *ap)
1696 IN struct vnode *a_vp;
1697 IN struct fid *a_fhp;
1704 ip = VTOI(ap->a_vp);
1705 ufhp = (struct ufid *)ap->a_fhp;
1706 ufhp->ufid_len = sizeof(struct ufid);
1707 ufhp->ufid_ino = ip->i_number;
1708 ufhp->ufid_gen = ip->i_gen;
1712 SYSCTL_DECL(_vfs_ffs);
1713 static int use_buf_pager = 1;
1714 SYSCTL_INT(_vfs_ffs, OID_AUTO, use_buf_pager, CTLFLAG_RWTUN, &use_buf_pager, 0,
1715 "Always use buffer pager instead of bmap");
1718 ffs_gbp_getblkno(struct vnode *vp, vm_ooffset_t off)
1721 return (lblkno(VFSTOUFS(vp->v_mount)->um_fs, off));
1725 ffs_gbp_getblksz(struct vnode *vp, daddr_t lbn)
1728 return (blksize(VFSTOUFS(vp->v_mount)->um_fs, VTOI(vp), lbn));
1732 ffs_getpages(struct vop_getpages_args *ap)
1735 struct ufsmount *um;
1738 um = VFSTOUFS(vp->v_mount);
1740 if (!use_buf_pager && um->um_devvp->v_bufobj.bo_bsize <= PAGE_SIZE)
1741 return (vnode_pager_generic_getpages(vp, ap->a_m, ap->a_count,
1742 ap->a_rbehind, ap->a_rahead, NULL, NULL));
1743 return (vfs_bio_getpages(vp, ap->a_m, ap->a_count, ap->a_rbehind,
1744 ap->a_rahead, ffs_gbp_getblkno, ffs_gbp_getblksz));
1748 ffs_getpages_async(struct vop_getpages_async_args *ap)
1751 struct ufsmount *um;
1755 um = VFSTOUFS(vp->v_mount);
1757 if (um->um_devvp->v_bufobj.bo_bsize <= PAGE_SIZE)
1758 return (vnode_pager_generic_getpages(vp, ap->a_m, ap->a_count,
1759 ap->a_rbehind, ap->a_rahead, ap->a_iodone, ap->a_arg));
1761 error = vfs_bio_getpages(vp, ap->a_m, ap->a_count, ap->a_rbehind,
1762 ap->a_rahead, ffs_gbp_getblkno, ffs_gbp_getblksz);
1763 ap->a_iodone(ap->a_arg, ap->a_m, ap->a_count, error);