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VOP_FSYNC — ?ե????륷???ƥ??Хåե??Υե??????ؤ??Ǥ??Ф?

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<sys/param.h> <sys/vnode.h> int VOP_FSYNC(struct vnode *vp, struct ucred *cred, int waitfor, struct thread *td)

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???θƤӽФ??ϥե??????????Ƥα??줿?Хåե????Ǥ??Ф??ޤ??? sync(2) ?????? fsync(2) ?????ƥॳ?????????????뤿???˻??Ѥ????ޤ???

?????ϰʲ????̤??Ǥ???

vp

?ե??????? vnode??

cred

?ƤӽФ?¦?ξ?????

waitfor

?????Ϥδ?λ???ؿ????ԤĤ٤????ɤ?????

MNT_WAIT: ?????Ϥδ?λ??Ʊ??Ū???Ԥ??ޤ???
MNT_NOWAIT: ???Ƥ??????Ϥ򳫻Ϥ??ޤ????????????Ԥ??ޤ?????
MNT_LAZY: ?ե????륷???ƥ??? syncer ?ˤ??äƽ????ޤ??Ƥ??ʤ??ǡ????????Ϥ??ޤ???

td

?ƤӽФ??Ƥ??륹???åɡ?

???? waitfor ?? MNT_WAIT ?ޤ??? MNT_NOWAIT ?Τɤ??餫?ǡ??ؿ??????????˽񤭹??ߤν?λ???ԤĤ٤????ɤ????????ꤷ?ޤ???

???å?

?ե??????ϥ????ȥ????˥??å????????٤??Ǥ???

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?ƤӽФ????????????????ˤ? 0 ???֤??졢 ?????Ǥʤ??????ˤ?Ŭ?ڤʥ??顼?????ɤ??֤????ޤ???

??????????

int
vop_fsync(struct vnode *vp, struct ucred *cred, int waitfor, struct thread *td)
{
    struct buf *bp;
    struct buf *nbp;
    struct timeval tv;
    int s;

loop:
    s = splbio();
    for (bp = vp->v_dirtyblkhd.lh_first; bp; bp = nbp) {
	nbp = bp->b_vnbufs.le_next;

	/*
	 * ???˽񤭹??????ΥХåե???̵?뤷?ޤ???
	 */
	if (bp->b_flags & B_BUSY)
	    continue;

	/*
	 * ?Хåե????????Ƥ??뤫??ǧ???ޤ???
	 */
	if ((bp->b_flags & B_DELWRI) == 0)
	    panic("vop_fsync: not dirty");

	vfs_bio_awrite(bp);
	splx(s);
	goto loop;
    }
    splx(s);

    if (waitfor == MNT_WAIT) {
	s = splbio();
	while (vp->v_numoutput) {
	    vp->v_flag |= VBWAIT;
	    tsleep((caddr_t)&vp->v_numoutput, PRIBIO + 1, "vopfsn");
	}
	splx(s);
#ifdef DIAGNOSTIC
	if (vp->v_dirtyblkhd.lh_first) {
	    vprint("vop_fsync: dirty", vp);
	    goto loop;
	}
#endif
    }

    /*
     * ?ǥ????????? vnode ???񤭽Ф??ޤ???
     */
    tv = time;
    return VOP_UPDATE(vp, &tv, &tv, waitfor == MNT_WAIT);
}

???顼

[ENOSPC]: ?ե????륷???ƥब???դǤ???
[EDQUOT]: ??????????Ķ?ᤷ?ޤ?????

??Ϣ????

vnode(9)

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???Υޥ˥奢???ڡ????? Doug Rabson ???񤭤ޤ?????