2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 2007-2009 Google Inc.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are
11 * * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * * Redistributions in binary form must reproduce the above
14 * copyright notice, this list of conditions and the following disclaimer
15 * in the documentation and/or other materials provided with the
17 * * Neither the name of Google Inc. nor the names of its
18 * contributors may be used to endorse or promote products derived from
19 * this software without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
25 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 * Copyright (C) 2005 Csaba Henk.
34 * All rights reserved.
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
39 * 1. Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in the
43 * documentation and/or other materials provided with the distribution.
45 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
46 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
47 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
48 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
49 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
50 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
51 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
52 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
53 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
54 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 #include <sys/cdefs.h>
59 __FBSDID("$FreeBSD$");
61 #include <sys/types.h>
62 #include <sys/module.h>
63 #include <sys/systm.h>
64 #include <sys/errno.h>
65 #include <sys/param.h>
66 #include <sys/kernel.h>
69 #include <sys/malloc.h>
70 #include <sys/queue.h>
73 #include <sys/mutex.h>
74 #include <sys/rwlock.h>
76 #include <sys/mount.h>
77 #include <sys/vnode.h>
79 #include <sys/unistd.h>
80 #include <sys/filedesc.h>
82 #include <sys/fcntl.h>
85 #include <sys/sysctl.h>
88 #include <vm/vm_extern.h>
90 #include <vm/vm_map.h>
91 #include <vm/vm_page.h>
92 #include <vm/vm_object.h>
95 #include "fuse_file.h"
96 #include "fuse_node.h"
97 #include "fuse_internal.h"
101 #define FUSE_DEBUG_MODULE IO
102 #include "fuse_debug.h"
106 fuse_read_directbackend(struct vnode *vp, struct uio *uio,
107 struct ucred *cred, struct fuse_filehandle *fufh);
109 fuse_read_biobackend(struct vnode *vp, struct uio *uio,
110 struct ucred *cred, struct fuse_filehandle *fufh);
112 fuse_write_directbackend(struct vnode *vp, struct uio *uio,
113 struct ucred *cred, struct fuse_filehandle *fufh, int ioflag);
115 fuse_write_biobackend(struct vnode *vp, struct uio *uio,
116 struct ucred *cred, struct fuse_filehandle *fufh, int ioflag);
119 fuse_io_dispatch(struct vnode *vp, struct uio *uio, int ioflag,
122 struct fuse_filehandle *fufh;
125 MPASS(vp->v_type == VREG || vp->v_type == VDIR);
127 err = fuse_filehandle_getrw(vp,
128 (uio->uio_rw == UIO_READ) ? FUFH_RDONLY : FUFH_WRONLY, &fufh);
130 printf("FUSE: io dispatch: filehandles are closed\n");
134 * Ideally, when the daemon asks for direct io at open time, the
135 * standard file flag should be set according to this, so that would
136 * just change the default mode, which later on could be changed via
138 * But this doesn't work, the O_DIRECT flag gets cleared at some point
139 * (don't know where). So to make any use of the Fuse direct_io option,
140 * we hardwire it into the file's private data (similarly to Linux,
143 directio = (ioflag & IO_DIRECT) || !fsess_opt_datacache(vnode_mount(vp));
145 switch (uio->uio_rw) {
148 FS_DEBUG("direct read of vnode %ju via file handle %ju\n",
149 (uintmax_t)VTOILLU(vp), (uintmax_t)fufh->fh_id);
150 err = fuse_read_directbackend(vp, uio, cred, fufh);
152 FS_DEBUG("buffered read of vnode %ju\n",
153 (uintmax_t)VTOILLU(vp));
154 err = fuse_read_biobackend(vp, uio, cred, fufh);
159 FS_DEBUG("direct write of vnode %ju via file handle %ju\n",
160 (uintmax_t)VTOILLU(vp), (uintmax_t)fufh->fh_id);
161 err = fuse_write_directbackend(vp, uio, cred, fufh, ioflag);
163 FS_DEBUG("buffered write of vnode %ju\n",
164 (uintmax_t)VTOILLU(vp));
165 err = fuse_write_biobackend(vp, uio, cred, fufh, ioflag);
169 panic("uninterpreted mode passed to fuse_io_dispatch");
176 fuse_read_biobackend(struct vnode *vp, struct uio *uio,
177 struct ucred *cred, struct fuse_filehandle *fufh)
182 int err = 0, n = 0, on = 0;
185 const int biosize = fuse_iosize(vp);
187 FS_DEBUG("resid=%zx offset=%jx fsize=%jx\n",
188 uio->uio_resid, uio->uio_offset, VTOFUD(vp)->filesize);
190 if (uio->uio_resid == 0)
192 if (uio->uio_offset < 0)
195 bcount = MIN(MAXBSIZE, biosize);
196 filesize = VTOFUD(vp)->filesize;
199 if (fuse_isdeadfs(vp)) {
203 lbn = uio->uio_offset / biosize;
204 on = uio->uio_offset & (biosize - 1);
206 FS_DEBUG2G("biosize %d, lbn %d, on %d\n", biosize, (int)lbn, on);
209 * Obtain the buffer cache block. Figure out the buffer size
210 * when we are at EOF. If we are modifying the size of the
211 * buffer based on an EOF condition we need to hold
212 * nfs_rslock() through obtaining the buffer to prevent
213 * a potential writer-appender from messing with n_size.
214 * Otherwise we may accidentally truncate the buffer and
217 * Note that bcount is *not* DEV_BSIZE aligned.
219 if ((off_t)lbn * biosize >= filesize) {
221 } else if ((off_t)(lbn + 1) * biosize > filesize) {
222 bcount = filesize - (off_t)lbn *biosize;
224 bp = getblk(vp, lbn, bcount, PCATCH, 0, 0);
230 * If B_CACHE is not set, we must issue the read. If this
231 * fails, we return an error.
234 if ((bp->b_flags & B_CACHE) == 0) {
235 bp->b_iocmd = BIO_READ;
236 vfs_busy_pages(bp, 0);
237 err = fuse_io_strategy(vp, bp);
244 * on is the offset into the current bp. Figure out how many
245 * bytes we can copy out of the bp. Note that bcount is
246 * NOT DEV_BSIZE aligned.
248 * Then figure out how many bytes we can copy into the uio.
253 n = MIN((unsigned)(bcount - on), uio->uio_resid);
255 FS_DEBUG2G("feeding buffeater with %d bytes of buffer %p,"
256 " saying %d was asked for\n",
257 n, bp->b_data + on, n + (int)bp->b_resid);
258 err = uiomove(bp->b_data + on, n, uio);
261 FS_DEBUG2G("end of turn, err %d, uio->uio_resid %zd, n %d\n",
262 err, uio->uio_resid, n);
263 } while (err == 0 && uio->uio_resid > 0 && n > 0);
269 fuse_read_directbackend(struct vnode *vp, struct uio *uio,
270 struct ucred *cred, struct fuse_filehandle *fufh)
272 struct fuse_dispatcher fdi;
273 struct fuse_read_in *fri;
276 if (uio->uio_resid == 0)
282 * XXX In "normal" case we use an intermediate kernel buffer for
283 * transmitting data from daemon's context to ours. Eventually, we should
284 * get rid of this. Anyway, if the target uio lives in sysspace (we are
285 * called from pageops), and the input data doesn't need kernel-side
286 * processing (we are not called from readdir) we can already invoke
287 * an optimized, "peer-to-peer" I/O routine.
289 while (uio->uio_resid > 0) {
290 fdi.iosize = sizeof(*fri);
291 fdisp_make_vp(&fdi, FUSE_READ, vp, uio->uio_td, cred);
293 fri->fh = fufh->fh_id;
294 fri->offset = uio->uio_offset;
295 fri->size = MIN(uio->uio_resid,
296 fuse_get_mpdata(vp->v_mount)->max_read);
298 FS_DEBUG2G("fri->fh %ju, fri->offset %ju, fri->size %ju\n",
299 (uintmax_t)fri->fh, (uintmax_t)fri->offset,
300 (uintmax_t)fri->size);
302 if ((err = fdisp_wait_answ(&fdi)))
305 FS_DEBUG2G("complete: got iosize=%d, requested fri.size=%zd; "
306 "resid=%zd offset=%ju\n",
307 fri->size, fdi.iosize, uio->uio_resid,
308 (uintmax_t)uio->uio_offset);
310 if ((err = uiomove(fdi.answ, MIN(fri->size, fdi.iosize), uio)))
312 if (fdi.iosize < fri->size)
322 fuse_write_directbackend(struct vnode *vp, struct uio *uio,
323 struct ucred *cred, struct fuse_filehandle *fufh, int ioflag)
325 struct fuse_vnode_data *fvdat = VTOFUD(vp);
326 struct fuse_write_in *fwi;
327 struct fuse_dispatcher fdi;
332 if (uio->uio_resid == 0)
334 if (ioflag & IO_APPEND)
335 uio_setoffset(uio, fvdat->filesize);
339 while (uio->uio_resid > 0) {
340 chunksize = MIN(uio->uio_resid,
341 fuse_get_mpdata(vp->v_mount)->max_write);
343 fdi.iosize = sizeof(*fwi) + chunksize;
344 fdisp_make_vp(&fdi, FUSE_WRITE, vp, uio->uio_td, cred);
347 fwi->fh = fufh->fh_id;
348 fwi->offset = uio->uio_offset;
349 fwi->size = chunksize;
351 if ((err = uiomove((char *)fdi.indata + sizeof(*fwi),
355 if ((err = fdisp_wait_answ(&fdi)))
358 diff = chunksize - ((struct fuse_write_out *)fdi.answ)->size;
363 uio->uio_resid += diff;
364 uio->uio_offset -= diff;
365 if (uio->uio_offset > fvdat->filesize)
366 fuse_vnode_setsize(vp, cred, uio->uio_offset);
375 fuse_write_biobackend(struct vnode *vp, struct uio *uio,
376 struct ucred *cred, struct fuse_filehandle *fufh, int ioflag)
378 struct fuse_vnode_data *fvdat = VTOFUD(vp);
384 const int biosize = fuse_iosize(vp);
386 KASSERT(uio->uio_rw == UIO_WRITE, ("ncl_write mode"));
387 FS_DEBUG("resid=%zx offset=%jx fsize=%jx\n",
388 uio->uio_resid, uio->uio_offset, fvdat->filesize);
389 if (vp->v_type != VREG)
391 if (uio->uio_offset < 0)
393 if (uio->uio_resid == 0)
395 if (ioflag & IO_APPEND)
396 uio_setoffset(uio, fvdat->filesize);
399 * Find all of this file's B_NEEDCOMMIT buffers. If our writes
400 * would exceed the local maximum per-file write commit size when
401 * combined with those, we must decide whether to flush,
402 * go synchronous, or return err. We don't bother checking
403 * IO_UNIT -- we just make all writes atomic anyway, as there's
404 * no point optimizing for something that really won't ever happen.
407 if (fuse_isdeadfs(vp)) {
411 lbn = uio->uio_offset / biosize;
412 on = uio->uio_offset & (biosize - 1);
413 n = MIN((unsigned)(biosize - on), uio->uio_resid);
415 FS_DEBUG2G("lbn %ju, on %d, n %d, uio offset %ju, uio resid %zd\n",
416 (uintmax_t)lbn, on, n,
417 (uintmax_t)uio->uio_offset, uio->uio_resid);
421 * Handle direct append and file extension cases, calculate
422 * unaligned buffer size.
424 if (uio->uio_offset == fvdat->filesize && n) {
426 * Get the buffer (in its pre-append state to maintain
427 * B_CACHE if it was previously set). Resize the
428 * nfsnode after we have locked the buffer to prevent
429 * readers from reading garbage.
432 FS_DEBUG("getting block from OS, bcount %d\n", bcount);
433 bp = getblk(vp, lbn, bcount, PCATCH, 0, 0);
438 err = fuse_vnode_setsize(vp, cred,
439 uio->uio_offset + n);
444 save = bp->b_flags & B_CACHE;
446 allocbuf(bp, bcount);
451 * Obtain the locked cache block first, and then
452 * adjust the file's size as appropriate.
455 if ((off_t)lbn * biosize + bcount < fvdat->filesize) {
456 if ((off_t)(lbn + 1) * biosize < fvdat->filesize)
459 bcount = fvdat->filesize -
462 FS_DEBUG("getting block from OS, bcount %d\n", bcount);
463 bp = getblk(vp, lbn, bcount, PCATCH, 0, 0);
464 if (bp && uio->uio_offset + n > fvdat->filesize) {
465 err = fuse_vnode_setsize(vp, cred,
466 uio->uio_offset + n);
479 * Issue a READ if B_CACHE is not set. In special-append
480 * mode, B_CACHE is based on the buffer prior to the write
481 * op and is typically set, avoiding the read. If a read
482 * is required in special append mode, the server will
483 * probably send us a short-read since we extended the file
484 * on our end, resulting in b_resid == 0 and, thusly,
485 * B_CACHE getting set.
487 * We can also avoid issuing the read if the write covers
488 * the entire buffer. We have to make sure the buffer state
489 * is reasonable in this case since we will not be initiating
490 * I/O. See the comments in kern/vfs_bio.c's getblk() for
493 * B_CACHE may also be set due to the buffer being cached
497 if (on == 0 && n == bcount) {
498 bp->b_flags |= B_CACHE;
499 bp->b_flags &= ~B_INVAL;
500 bp->b_ioflags &= ~BIO_ERROR;
502 if ((bp->b_flags & B_CACHE) == 0) {
503 bp->b_iocmd = BIO_READ;
504 vfs_busy_pages(bp, 0);
505 fuse_io_strategy(vp, bp);
506 if ((err = bp->b_error)) {
511 if (bp->b_wcred == NOCRED)
512 bp->b_wcred = crhold(cred);
515 * If dirtyend exceeds file size, chop it down. This should
516 * not normally occur but there is an append race where it
517 * might occur XXX, so we log it.
519 * If the chopping creates a reverse-indexed or degenerate
520 * situation with dirtyoff/end, we 0 both of them.
523 if (bp->b_dirtyend > bcount) {
524 FS_DEBUG("FUSE append race @%lx:%d\n",
525 (long)bp->b_blkno * biosize,
526 bp->b_dirtyend - bcount);
527 bp->b_dirtyend = bcount;
529 if (bp->b_dirtyoff >= bp->b_dirtyend)
530 bp->b_dirtyoff = bp->b_dirtyend = 0;
533 * If the new write will leave a contiguous dirty
534 * area, just update the b_dirtyoff and b_dirtyend,
535 * otherwise force a write rpc of the old dirty area.
537 * While it is possible to merge discontiguous writes due to
538 * our having a B_CACHE buffer ( and thus valid read data
539 * for the hole), we don't because it could lead to
540 * significant cache coherency problems with multiple clients,
541 * especially if locking is implemented later on.
543 * as an optimization we could theoretically maintain
544 * a linked list of discontinuous areas, but we would still
545 * have to commit them separately so there isn't much
546 * advantage to it except perhaps a bit of asynchronization.
549 if (bp->b_dirtyend > 0 &&
550 (on > bp->b_dirtyend || (on + n) < bp->b_dirtyoff)) {
552 * Yes, we mean it. Write out everything to "storage"
553 * immediately, without hesitation. (Apart from other
554 * reasons: the only way to know if a write is valid
555 * if its actually written out.)
558 if (bp->b_error == EINTR) {
564 err = uiomove((char *)bp->b_data + on, n, uio);
567 * Since this block is being modified, it must be written
568 * again and not just committed. Since write clustering does
569 * not work for the stage 1 data write, only the stage 2
570 * commit rpc, we have to clear B_CLUSTEROK as well.
572 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
575 bp->b_ioflags |= BIO_ERROR;
581 * Only update dirtyoff/dirtyend if not a degenerate
585 if (bp->b_dirtyend > 0) {
586 bp->b_dirtyoff = MIN(on, bp->b_dirtyoff);
587 bp->b_dirtyend = MAX((on + n), bp->b_dirtyend);
590 bp->b_dirtyend = on + n;
592 vfs_bio_set_valid(bp, on, n);
597 } while (uio->uio_resid > 0 && n > 0);
599 if (fuse_sync_resize && (fvdat->flag & FN_SIZECHANGE) != 0)
600 fuse_vnode_savesize(vp, cred);
606 fuse_io_strategy(struct vnode *vp, struct buf *bp)
608 struct fuse_filehandle *fufh;
609 struct fuse_vnode_data *fvdat = VTOFUD(vp);
616 const int biosize = fuse_iosize(vp);
618 MPASS(vp->v_type == VREG || vp->v_type == VDIR);
619 MPASS(bp->b_iocmd == BIO_READ || bp->b_iocmd == BIO_WRITE);
620 FS_DEBUG("inode=%ju offset=%jd resid=%ld\n",
621 (uintmax_t)VTOI(vp), (intmax_t)(((off_t)bp->b_blkno) * biosize),
624 error = fuse_filehandle_getrw(vp,
625 (bp->b_iocmd == BIO_READ) ? FUFH_RDONLY : FUFH_WRONLY, &fufh);
627 printf("FUSE: strategy: filehandles are closed\n");
628 bp->b_ioflags |= BIO_ERROR;
632 cred = bp->b_iocmd == BIO_READ ? bp->b_rcred : bp->b_wcred;
636 uiop->uio_iovcnt = 1;
637 uiop->uio_segflg = UIO_SYSSPACE;
638 uiop->uio_td = curthread;
641 * clear BIO_ERROR and B_INVAL state prior to initiating the I/O. We
642 * do this here so we do not have to do it in all the code that
645 bp->b_flags &= ~B_INVAL;
646 bp->b_ioflags &= ~BIO_ERROR;
648 KASSERT(!(bp->b_flags & B_DONE),
649 ("fuse_io_strategy: bp %p already marked done", bp));
650 if (bp->b_iocmd == BIO_READ) {
651 io.iov_len = uiop->uio_resid = bp->b_bcount;
652 io.iov_base = bp->b_data;
653 uiop->uio_rw = UIO_READ;
655 uiop->uio_offset = ((off_t)bp->b_blkno) * biosize;
656 error = fuse_read_directbackend(vp, uiop, cred, fufh);
658 if ((!error && uiop->uio_resid) ||
659 (fsess_opt_brokenio(vnode_mount(vp)) && error == EIO &&
660 uiop->uio_offset < fvdat->filesize && fvdat->filesize > 0 &&
661 uiop->uio_offset >= fvdat->cached_attrs.va_size)) {
663 * If we had a short read with no error, we must have
664 * hit a file hole. We should zero-fill the remainder.
665 * This can also occur if the server hits the file EOF.
667 * Holes used to be able to occur due to pending
668 * writes, but that is not possible any longer.
670 int nread = bp->b_bcount - uiop->uio_resid;
671 int left = uiop->uio_resid;
674 printf("FUSE: Fix broken io: offset %ju, "
675 " resid %zd, file size %ju/%ju\n",
676 (uintmax_t)uiop->uio_offset,
677 uiop->uio_resid, fvdat->filesize,
678 fvdat->cached_attrs.va_size);
682 bzero((char *)bp->b_data + nread, left);
686 bp->b_ioflags |= BIO_ERROR;
691 * If we only need to commit, try to commit
693 if (bp->b_flags & B_NEEDCOMMIT) {
694 FS_DEBUG("write: B_NEEDCOMMIT flags set\n");
697 * Setup for actual write
699 if ((off_t)bp->b_blkno * biosize + bp->b_dirtyend >
701 bp->b_dirtyend = fvdat->filesize -
702 (off_t)bp->b_blkno * biosize;
704 if (bp->b_dirtyend > bp->b_dirtyoff) {
705 io.iov_len = uiop->uio_resid = bp->b_dirtyend
707 uiop->uio_offset = (off_t)bp->b_blkno * biosize
709 io.iov_base = (char *)bp->b_data + bp->b_dirtyoff;
710 uiop->uio_rw = UIO_WRITE;
712 error = fuse_write_directbackend(vp, uiop, cred, fufh, 0);
714 if (error == EINTR || error == ETIMEDOUT
715 || (!error && (bp->b_flags & B_NEEDCOMMIT))) {
717 bp->b_flags &= ~(B_INVAL | B_NOCACHE);
718 if ((bp->b_flags & B_PAGING) == 0) {
720 bp->b_flags &= ~B_DONE;
722 if ((error == EINTR || error == ETIMEDOUT) &&
723 (bp->b_flags & B_ASYNC) == 0)
724 bp->b_flags |= B_EINTR;
727 bp->b_ioflags |= BIO_ERROR;
728 bp->b_flags |= B_INVAL;
731 bp->b_dirtyoff = bp->b_dirtyend = 0;
739 bp->b_resid = uiop->uio_resid;
745 fuse_io_flushbuf(struct vnode *vp, int waitfor, struct thread *td)
747 struct vop_fsync_args a = {
749 .a_waitfor = waitfor,
753 return (vop_stdfsync(&a));
757 * Flush and invalidate all dirty buffers. If another process is already
758 * doing the flush, just wait for completion.
761 fuse_io_invalbuf(struct vnode *vp, struct thread *td)
763 struct fuse_vnode_data *fvdat = VTOFUD(vp);
766 if (vp->v_iflag & VI_DOOMED)
769 ASSERT_VOP_ELOCKED(vp, "fuse_io_invalbuf");
771 while (fvdat->flag & FN_FLUSHINPROG) {
772 struct proc *p = td->td_proc;
774 if (vp->v_mount->mnt_kern_flag & MNTK_UNMOUNTF)
776 fvdat->flag |= FN_FLUSHWANT;
777 tsleep(&fvdat->flag, PRIBIO + 2, "fusevinv", 2 * hz);
781 if (SIGNOTEMPTY(p->p_siglist) ||
782 SIGNOTEMPTY(td->td_siglist))
789 fvdat->flag |= FN_FLUSHINPROG;
791 if (vp->v_bufobj.bo_object != NULL) {
792 VM_OBJECT_WLOCK(vp->v_bufobj.bo_object);
793 vm_object_page_clean(vp->v_bufobj.bo_object, 0, 0, OBJPC_SYNC);
794 VM_OBJECT_WUNLOCK(vp->v_bufobj.bo_object);
796 error = vinvalbuf(vp, V_SAVE, PCATCH, 0);
798 if (error == ERESTART || error == EINTR) {
799 fvdat->flag &= ~FN_FLUSHINPROG;
800 if (fvdat->flag & FN_FLUSHWANT) {
801 fvdat->flag &= ~FN_FLUSHWANT;
802 wakeup(&fvdat->flag);
806 error = vinvalbuf(vp, V_SAVE, PCATCH, 0);
808 fvdat->flag &= ~FN_FLUSHINPROG;
809 if (fvdat->flag & FN_FLUSHWANT) {
810 fvdat->flag &= ~FN_FLUSHWANT;
811 wakeup(&fvdat->flag);