Cleanup CCD quite a bit, including adding clarifying comments.
Enhance MIRROR code. Add a few more sanity checks and implement
a zone-based disk selector to make use of both disks when reading.
Also implement a read fail-over. If a read error occurs on one
disk, the I/O is retried on the other.
NOTE: CCD's mirroring support cannot deal with write errors properly
in regards to recovery, meaning that 'old' data under a write error may
be read non-deterministically if you reboot after a write error, and CCD
certainly cannot deal with a disk changeout. And it still can't. Use
vinum if you are really serious about mirroring. CCD basically just
implements a poor-man's mirror.
This commit is contained in:
Matthew Dillon
parent
25d1a00bc0
commit
1464240ec4
@ -146,6 +146,7 @@ SYSCTL_INT(_debug, OID_AUTO, ccddebug, CTLFLAG_RW, &ccddebug, 0, "");
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struct ccdbuf {
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struct buf cb_buf; /* new I/O buf */
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struct buf *cb_obp; /* ptr. to original I/O buf */
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struct ccdbuf *cb_freenext; /* free list link */
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int cb_unit; /* target unit */
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int cb_comp; /* target component */
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int cb_pflags; /* mirror/parity status flag */
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@ -155,11 +156,6 @@ struct ccdbuf {
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/* bits in cb_pflags */
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#define CCDPF_MIRROR_DONE 1 /* if set, mirror counterpart is done */
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#define getccdbuf() \
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((struct ccdbuf *)malloc(sizeof(struct ccdbuf), M_DEVBUF, M_WAITOK))
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#define putccdbuf(cbp) \
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free((caddr_t)(cbp), M_DEVBUF)
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#define CCDLABELDEV(dev) \
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(makedev(major((dev)), dkmakeminor(ccdunit((dev)), 0, RAW_PART)))
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@ -170,6 +166,8 @@ static d_ioctl_t ccdioctl;
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static d_dump_t ccddump;
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static d_psize_t ccdsize;
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#define NCCDFREEHIWAT 16
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#define CDEV_MAJOR 74
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#define BDEV_MAJOR 21
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@ -221,8 +219,70 @@ static void printiinfo __P((struct ccdiinfo *));
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/* Non-private for the benefit of libkvm. */
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struct ccd_softc *ccd_softc;
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struct ccddevice *ccddevs;
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struct ccdbuf *ccdfreebufs;
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static int numccdfreebufs;
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static int numccd = 0;
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/*
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* getccdbuf() - Allocate and zero a ccd buffer.
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*
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* This routine is called at splbio().
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*/
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static __inline
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struct ccdbuf *
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getccdbuf(struct ccdbuf *cpy)
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{
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struct ccdbuf *cbp;
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/*
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* Allocate from freelist or malloc as necessary
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*/
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if ((cbp = ccdfreebufs) != NULL) {
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ccdfreebufs = cbp->cb_freenext;
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--numccdfreebufs;
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} else {
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cbp = malloc(sizeof(struct ccdbuf), M_DEVBUF, M_WAITOK);
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}
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/*
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* Used by mirroring code
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*/
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if (cpy)
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bcopy(cpy, cbp, sizeof(struct ccdbuf));
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else
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bzero(cbp, sizeof(struct ccdbuf));
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/*
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* independant struct buf initialization
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*/
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LIST_INIT(&cbp->cb_buf.b_dep);
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BUF_LOCKINIT(&cbp->cb_buf);
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BUF_LOCK(&cbp->cb_buf, LK_EXCLUSIVE);
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return(cbp);
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}
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/*
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* putccdbuf() - Allocate and zero a ccd buffer.
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*
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* This routine is called at splbio().
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*/
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static __inline
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void
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putccdbuf(struct ccdbuf *cbp)
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{
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if (numccdfreebufs < NCCDFREEHIWAT) {
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cbp->cb_freenext = ccdfreebufs;
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ccdfreebufs = cbp;
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++numccdfreebufs;
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} else {
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free((caddr_t)cbp, M_DEVBUF);
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}
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}
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/*
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* Number of blocks to untouched in front of a component partition.
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* This is to avoid violating its disklabel area when it starts at the
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@ -301,17 +361,17 @@ ccdinit(ccd, cpaths, p)
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char **cpaths;
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struct proc *p;
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{
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register struct ccd_softc *cs = &ccd_softc[ccd->ccd_unit];
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register struct ccdcinfo *ci = NULL; /* XXX */
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register size_t size;
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register int ix;
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struct ccd_softc *cs = &ccd_softc[ccd->ccd_unit];
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struct ccdcinfo *ci = NULL; /* XXX */
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size_t size;
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int ix;
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struct vnode *vp;
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size_t minsize;
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int maxsecsize;
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struct partinfo dpart;
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struct ccdgeom *ccg = &cs->sc_geom;
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char tmppath[MAXPATHLEN];
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int error;
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int error = 0;
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#ifdef DEBUG
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if (ccddebug & (CCDB_FOLLOW|CCDB_INIT))
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@ -348,12 +408,7 @@ ccdinit(ccd, cpaths, p)
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printf("ccd%d: can't copy path, error = %d\n",
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ccd->ccd_unit, error);
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#endif
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while (ci > cs->sc_cinfo) {
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ci--;
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free(ci->ci_path, M_DEVBUF);
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}
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free(cs->sc_cinfo, M_DEVBUF);
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return (error);
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goto fail;
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}
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ci->ci_path = malloc(ci->ci_pathlen, M_DEVBUF, M_WAITOK);
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bcopy(tmppath, ci->ci_path, ci->ci_pathlen);
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@ -370,12 +425,7 @@ ccdinit(ccd, cpaths, p)
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printf("ccd%d: %s: ioctl failed, error = %d\n",
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ccd->ccd_unit, ci->ci_path, error);
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#endif
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while (ci >= cs->sc_cinfo) {
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free(ci->ci_path, M_DEVBUF);
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ci--;
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}
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free(cs->sc_cinfo, M_DEVBUF);
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return (error);
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goto fail;
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}
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if (dpart.part->p_fstype == FS_BSDFFS) {
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maxsecsize =
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@ -388,12 +438,8 @@ ccdinit(ccd, cpaths, p)
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printf("ccd%d: %s: incorrect partition type\n",
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ccd->ccd_unit, ci->ci_path);
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#endif
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while (ci >= cs->sc_cinfo) {
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free(ci->ci_path, M_DEVBUF);
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ci--;
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}
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free(cs->sc_cinfo, M_DEVBUF);
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return (EFTYPE);
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error = EFTYPE;
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goto fail;
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}
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/*
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@ -410,12 +456,8 @@ ccdinit(ccd, cpaths, p)
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printf("ccd%d: %s: size == 0\n",
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ccd->ccd_unit, ci->ci_path);
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#endif
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while (ci >= cs->sc_cinfo) {
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free(ci->ci_path, M_DEVBUF);
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ci--;
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}
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free(cs->sc_cinfo, M_DEVBUF);
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return (ENODEV);
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error = ENODEV;
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goto fail;
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}
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if (minsize == 0 || size < minsize)
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@ -435,42 +477,52 @@ ccdinit(ccd, cpaths, p)
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printf("ccd%d: interleave must be at least %d\n",
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ccd->ccd_unit, (maxsecsize / DEV_BSIZE));
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#endif
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while (ci >= cs->sc_cinfo) {
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free(ci->ci_path, M_DEVBUF);
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ci--;
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}
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free(cs->sc_cinfo, M_DEVBUF);
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return (EINVAL);
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error = EINVAL;
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goto fail;
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}
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/*
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* If uniform interleave is desired set all sizes to that of
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* the smallest component.
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* the smallest component. This will guarentee that a single
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* interleave table is generated.
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*
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* Lost space must be taken into account when calculating the
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* overall size. Half the space is lost when CCDF_MIRROR is
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* specified. One disk is lost when CCDF_PARITY is specified.
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*/
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if (ccd->ccd_flags & CCDF_UNIFORM) {
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for (ci = cs->sc_cinfo;
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ci < &cs->sc_cinfo[cs->sc_nccdisks]; ci++)
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ci < &cs->sc_cinfo[cs->sc_nccdisks]; ci++) {
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ci->ci_size = minsize;
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}
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if (ccd->ccd_flags & CCDF_MIRROR) {
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/*
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* Check to see if an even number of components
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* have been specified.
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* have been specified. The interleave must also
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* be non-zero in order for us to be able to
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* guarentee the topology.
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*/
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if (cs->sc_nccdisks % 2) {
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printf("ccd%d: mirroring requires an even number of disks\n", ccd->ccd_unit );
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while (ci > cs->sc_cinfo) {
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ci--;
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free(ci->ci_path, M_DEVBUF);
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}
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free(cs->sc_cinfo, M_DEVBUF);
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return (EINVAL);
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error = EINVAL;
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goto fail;
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}
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if (cs->sc_ileave == 0) {
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printf("ccd%d: an interleave must be specified when mirroring\n", ccd->ccd_unit);
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error = EINVAL;
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goto fail;
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}
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cs->sc_size = (cs->sc_nccdisks/2) * minsize;
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}
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else if (ccd->ccd_flags & CCDF_PARITY)
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} else if (ccd->ccd_flags & CCDF_PARITY) {
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cs->sc_size = (cs->sc_nccdisks-1) * minsize;
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else
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} else {
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if (cs->sc_ileave == 0) {
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printf("ccd%d: an interleave must be specified when using parity\n", ccd->ccd_unit);
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error = EINVAL;
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goto fail;
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}
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cs->sc_size = cs->sc_nccdisks * minsize;
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}
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}
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/*
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@ -499,25 +551,36 @@ ccdinit(ccd, cpaths, p)
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cs->sc_cflags = ccd->ccd_flags; /* So we can find out later... */
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cs->sc_unit = ccd->ccd_unit;
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return (0);
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fail:
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while (ci > cs->sc_cinfo) {
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ci--;
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free(ci->ci_path, M_DEVBUF);
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}
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free(cs->sc_cinfo, M_DEVBUF);
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return (error);
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}
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static void
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ccdinterleave(cs, unit)
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register struct ccd_softc *cs;
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struct ccd_softc *cs;
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int unit;
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{
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register struct ccdcinfo *ci, *smallci;
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register struct ccdiinfo *ii;
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register daddr_t bn, lbn;
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register int ix;
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struct ccdcinfo *ci, *smallci;
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struct ccdiinfo *ii;
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daddr_t bn, lbn;
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int ix;
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u_long size;
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#ifdef DEBUG
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if (ccddebug & CCDB_INIT)
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printf("ccdinterleave(%x): ileave %d\n", cs, cs->sc_ileave);
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#endif
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/*
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* Allocate an interleave table.
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* Allocate an interleave table. The worst case occurs when each
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* of N disks is of a different size, resulting in N interleave
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* tables.
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*
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* Chances are this is too big, but we don't care.
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*/
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size = (cs->sc_nccdisks + 1) * sizeof(struct ccdiinfo);
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@ -527,6 +590,8 @@ ccdinterleave(cs, unit)
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/*
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* Trivial case: no interleave (actually interleave of disk size).
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* Each table entry represents a single component in its entirety.
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*
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* An interleave of 0 may not be used with a mirror or parity setup.
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*/
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if (cs->sc_ileave == 0) {
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bn = 0;
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@ -556,7 +621,10 @@ ccdinterleave(cs, unit)
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size = 0;
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bn = lbn = 0;
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for (ii = cs->sc_itable; ; ii++) {
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/* Allocate space for ii_index. */
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/*
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* Allocate space for ii_index. We might allocate more then
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* we use.
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*/
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ii->ii_index = malloc((sizeof(int) * cs->sc_nccdisks),
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M_DEVBUF, M_WAITOK);
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@ -564,12 +632,14 @@ ccdinterleave(cs, unit)
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* Locate the smallest of the remaining components
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*/
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smallci = NULL;
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for (ci = cs->sc_cinfo;
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ci < &cs->sc_cinfo[cs->sc_nccdisks]; ci++)
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for (ci = cs->sc_cinfo; ci < &cs->sc_cinfo[cs->sc_nccdisks];
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ci++) {
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if (ci->ci_size > size &&
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(smallci == NULL ||
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ci->ci_size < smallci->ci_size))
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ci->ci_size < smallci->ci_size)) {
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smallci = ci;
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}
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}
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/*
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* Nobody left, all done
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@ -580,9 +650,15 @@ ccdinterleave(cs, unit)
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}
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/*
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* Record starting logical block and component offset
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* Record starting logical block using an sc_ileave blocksize.
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*/
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ii->ii_startblk = bn / cs->sc_ileave;
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/*
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* Record starting comopnent block using an sc_ileave
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* blocksize. This value is relative to the beginning of
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* a component disk.
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*/
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ii->ii_startoff = lbn;
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/*
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@ -590,10 +666,12 @@ ccdinterleave(cs, unit)
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* and record their indices.
|
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*/
|
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ix = 0;
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for (ci = cs->sc_cinfo;
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ci < &cs->sc_cinfo[cs->sc_nccdisks]; ci++)
|
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if (ci->ci_size >= smallci->ci_size)
|
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for (ci = cs->sc_cinfo;
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ci < &cs->sc_cinfo[cs->sc_nccdisks]; ci++) {
|
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if (ci->ci_size >= smallci->ci_size) {
|
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ii->ii_index[ix++] = ci - cs->sc_cinfo;
|
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}
|
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}
|
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ii->ii_ndisk = ix;
|
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bn += ix * (smallci->ci_size - size);
|
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lbn = smallci->ci_size / cs->sc_ileave;
|
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@ -710,11 +788,11 @@ ccdclose(dev, flags, fmt, p)
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|
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static void
|
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ccdstrategy(bp)
|
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register struct buf *bp;
|
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struct buf *bp;
|
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{
|
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register int unit = ccdunit(bp->b_dev);
|
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register struct ccd_softc *cs = &ccd_softc[unit];
|
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register int s;
|
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int unit = ccdunit(bp->b_dev);
|
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struct ccd_softc *cs = &ccd_softc[unit];
|
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int s;
|
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int wlabel;
|
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struct disklabel *lp;
|
||||
|
||||
@ -758,10 +836,10 @@ done:
|
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|
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static void
|
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ccdstart(cs, bp)
|
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register struct ccd_softc *cs;
|
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register struct buf *bp;
|
||||
struct ccd_softc *cs;
|
||||
struct buf *bp;
|
||||
{
|
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register long bcount, rcount;
|
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long bcount, rcount;
|
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struct ccdbuf *cbp[4];
|
||||
/* XXX! : 2 reads and 2 writes for RAID 4/5 */
|
||||
caddr_t addr;
|
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@ -792,14 +870,44 @@ ccdstart(cs, bp)
|
||||
for (bcount = bp->b_bcount; bcount > 0; bcount -= rcount) {
|
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ccdbuffer(cbp, cs, bp, bn, addr, bcount);
|
||||
rcount = cbp[0]->cb_buf.b_bcount;
|
||||
if ((cbp[0]->cb_buf.b_flags & B_READ) == 0)
|
||||
cbp[0]->cb_buf.b_vp->v_numoutput++;
|
||||
VOP_STRATEGY(cbp[0]->cb_buf.b_vp, &cbp[0]->cb_buf);
|
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if (cs->sc_cflags & CCDF_MIRROR &&
|
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(cbp[0]->cb_buf.b_flags & B_READ) == 0) {
|
||||
/* mirror, start another write */
|
||||
cbp[1]->cb_buf.b_vp->v_numoutput++;
|
||||
VOP_STRATEGY(cbp[1]->cb_buf.b_vp, &cbp[1]->cb_buf);
|
||||
|
||||
if (cs->sc_cflags & CCDF_MIRROR) {
|
||||
/*
|
||||
* Mirroring. Writes go to both disks, reads are
|
||||
* taken from whichever disk seems most appropriate.
|
||||
*
|
||||
* We attempt to localize reads to the disk whos arm
|
||||
* is nearest the read request. We ignore seeks due
|
||||
* to writes when making this determination and we
|
||||
* also try to avoid hogging.
|
||||
*/
|
||||
if ((cbp[0]->cb_buf.b_flags & B_READ) == 0) {
|
||||
cbp[0]->cb_buf.b_vp->v_numoutput++;
|
||||
cbp[1]->cb_buf.b_vp->v_numoutput++;
|
||||
VOP_STRATEGY(cbp[0]->cb_buf.b_vp,
|
||||
&cbp[0]->cb_buf);
|
||||
VOP_STRATEGY(cbp[1]->cb_buf.b_vp,
|
||||
&cbp[1]->cb_buf);
|
||||
} else {
|
||||
int pick = cs->sc_pick;
|
||||
daddr_t range = cs->sc_size / 16;
|
||||
|
||||
if (bn < cs->sc_blk[pick] - range ||
|
||||
bn > cs->sc_blk[pick] + range
|
||||
) {
|
||||
cs->sc_pick = pick = 1 - pick;
|
||||
}
|
||||
cs->sc_blk[pick] = bn + btodb(rcount);
|
||||
VOP_STRATEGY(cbp[pick]->cb_buf.b_vp,
|
||||
&cbp[pick]->cb_buf);
|
||||
}
|
||||
} else {
|
||||
/*
|
||||
* Not mirroring
|
||||
*/
|
||||
if ((cbp[0]->cb_buf.b_flags & B_READ) == 0)
|
||||
cbp[0]->cb_buf.b_vp->v_numoutput++;
|
||||
VOP_STRATEGY(cbp[0]->cb_buf.b_vp, &cbp[0]->cb_buf);
|
||||
}
|
||||
bn += btodb(rcount);
|
||||
addr += rcount;
|
||||
@ -811,17 +919,17 @@ ccdstart(cs, bp)
|
||||
*/
|
||||
static void
|
||||
ccdbuffer(cb, cs, bp, bn, addr, bcount)
|
||||
register struct ccdbuf **cb;
|
||||
register struct ccd_softc *cs;
|
||||
struct ccdbuf **cb;
|
||||
struct ccd_softc *cs;
|
||||
struct buf *bp;
|
||||
daddr_t bn;
|
||||
caddr_t addr;
|
||||
long bcount;
|
||||
{
|
||||
register struct ccdcinfo *ci, *ci2 = NULL; /* XXX */
|
||||
register struct ccdbuf *cbp;
|
||||
register daddr_t cbn, cboff;
|
||||
register off_t cbc;
|
||||
struct ccdcinfo *ci, *ci2 = NULL; /* XXX */
|
||||
struct ccdbuf *cbp;
|
||||
daddr_t cbn, cboff;
|
||||
off_t cbc;
|
||||
|
||||
#ifdef DEBUG
|
||||
if (ccddebug & CCDB_IO)
|
||||
@ -834,61 +942,108 @@ ccdbuffer(cb, cs, bp, bn, addr, bcount)
|
||||
cbn = bn;
|
||||
cboff = 0;
|
||||
|
||||
/*
|
||||
* Serially concatenated
|
||||
*/
|
||||
if (cs->sc_ileave == 0) {
|
||||
register daddr_t sblk;
|
||||
/*
|
||||
* Serially concatenated and neither a mirror nor a parity
|
||||
* config. This is a special case.
|
||||
*/
|
||||
daddr_t sblk;
|
||||
|
||||
sblk = 0;
|
||||
for (ci = cs->sc_cinfo; cbn >= sblk + ci->ci_size; ci++)
|
||||
sblk += ci->ci_size;
|
||||
cbn -= sblk;
|
||||
}
|
||||
/*
|
||||
* Interleaved
|
||||
*/
|
||||
else {
|
||||
register struct ccdiinfo *ii;
|
||||
} else {
|
||||
struct ccdiinfo *ii;
|
||||
int ccdisk, off;
|
||||
|
||||
cboff = cbn % cs->sc_ileave;
|
||||
cbn /= cs->sc_ileave;
|
||||
for (ii = cs->sc_itable; ii->ii_ndisk; ii++)
|
||||
/*
|
||||
* Calculate cbn, the logical superblock (sc_ileave chunks),
|
||||
* and cboff, a normal block offset (DEV_BSIZE chunks) relative
|
||||
* to cbn.
|
||||
*/
|
||||
cboff = cbn % cs->sc_ileave; /* DEV_BSIZE gran */
|
||||
cbn = cbn / cs->sc_ileave; /* DEV_BSIZE * ileave gran */
|
||||
|
||||
/*
|
||||
* Figure out which interleave table to use.
|
||||
*/
|
||||
for (ii = cs->sc_itable; ii->ii_ndisk; ii++) {
|
||||
if (ii->ii_startblk > cbn)
|
||||
break;
|
||||
}
|
||||
ii--;
|
||||
|
||||
/*
|
||||
* off is the logical superblock relative to the beginning
|
||||
* of this interleave block.
|
||||
*/
|
||||
off = cbn - ii->ii_startblk;
|
||||
|
||||
/*
|
||||
* We must calculate which disk component to use (ccdisk),
|
||||
* and recalculate cbn to be the superblock relative to
|
||||
* the beginning of the component. This is typically done by
|
||||
* adding 'off' and ii->ii_startoff together. However, 'off'
|
||||
* must typically be divided by the number of components in
|
||||
* this interleave array to be properly convert it from a
|
||||
* CCD-relative logical superblock number to a
|
||||
* component-relative superblock number.
|
||||
*/
|
||||
if (ii->ii_ndisk == 1) {
|
||||
/*
|
||||
* When we have just one disk, it can't be a mirror
|
||||
* or a parity config.
|
||||
*/
|
||||
ccdisk = ii->ii_index[0];
|
||||
cbn = ii->ii_startoff + off;
|
||||
} else {
|
||||
if (cs->sc_cflags & CCDF_MIRROR) {
|
||||
ccdisk = ii->ii_index[off % (ii->ii_ndisk/2)];
|
||||
cbn = ii->ii_startoff + off / (ii->ii_ndisk/2);
|
||||
/* mirrored data */
|
||||
ci2 = &cs->sc_cinfo[ccdisk + ii->ii_ndisk/2];
|
||||
}
|
||||
else if (cs->sc_cflags & CCDF_PARITY) {
|
||||
ccdisk = ii->ii_index[off % (ii->ii_ndisk-1)];
|
||||
cbn = ii->ii_startoff + off / (ii->ii_ndisk-1);
|
||||
/*
|
||||
* We have forced a uniform mapping, resulting
|
||||
* in a single interleave array. We double
|
||||
* up on the first half of the available
|
||||
* components and our mirror is in the second
|
||||
* half. This only works with a single
|
||||
* interleave array because doubling up
|
||||
* doubles the number of sectors, so there
|
||||
* cannot be another interleave array because
|
||||
* the next interleave array's calculations
|
||||
* would be off.
|
||||
*/
|
||||
int ndisk2 = ii->ii_ndisk / 2;
|
||||
ccdisk = ii->ii_index[off % ndisk2];
|
||||
cbn = ii->ii_startoff + off / ndisk2;
|
||||
ci2 = &cs->sc_cinfo[ccdisk + ndisk2];
|
||||
} else if (cs->sc_cflags & CCDF_PARITY) {
|
||||
/*
|
||||
* XXX not implemented yet
|
||||
*/
|
||||
int ndisk2 = ii->ii_ndisk - 1;
|
||||
ccdisk = ii->ii_index[off % ndisk2];
|
||||
cbn = ii->ii_startoff + off / ndisk2;
|
||||
if (cbn % ii->ii_ndisk <= ccdisk)
|
||||
ccdisk++;
|
||||
}
|
||||
else {
|
||||
} else {
|
||||
ccdisk = ii->ii_index[off % ii->ii_ndisk];
|
||||
cbn = ii->ii_startoff + off / ii->ii_ndisk;
|
||||
}
|
||||
}
|
||||
cbn *= cs->sc_ileave;
|
||||
|
||||
ci = &cs->sc_cinfo[ccdisk];
|
||||
|
||||
/*
|
||||
* Convert cbn from a superblock to a normal block so it
|
||||
* can be used to calculate (along with cboff) the normal
|
||||
* block index into this particular disk.
|
||||
*/
|
||||
cbn *= cs->sc_ileave;
|
||||
}
|
||||
|
||||
/*
|
||||
* Fill in the component buf structure.
|
||||
*/
|
||||
cbp = getccdbuf();
|
||||
bzero(cbp, sizeof (struct ccdbuf));
|
||||
cbp = getccdbuf(NULL);
|
||||
cbp->cb_buf.b_flags = bp->b_flags | B_CALL;
|
||||
cbp->cb_buf.b_iodone = (void (*)(struct buf *))ccdiodone;
|
||||
cbp->cb_buf.b_dev = ci->ci_dev; /* XXX */
|
||||
@ -896,10 +1051,6 @@ ccdbuffer(cb, cs, bp, bn, addr, bcount)
|
||||
cbp->cb_buf.b_offset = dbtob(cbn + cboff + CCD_OFFSET);
|
||||
cbp->cb_buf.b_data = addr;
|
||||
cbp->cb_buf.b_vp = ci->ci_vp;
|
||||
LIST_INIT(&cbp->cb_buf.b_dep);
|
||||
BUF_LOCKINIT(&cbp->cb_buf);
|
||||
BUF_LOCK(&cbp->cb_buf, LK_EXCLUSIVE);
|
||||
cbp->cb_buf.b_resid = 0;
|
||||
if (cs->sc_ileave == 0)
|
||||
cbc = dbtob((off_t)(ci->ci_size - cbn));
|
||||
else
|
||||
@ -921,17 +1072,16 @@ ccdbuffer(cb, cs, bp, bn, addr, bcount)
|
||||
cbp->cb_buf.b_data, cbp->cb_buf.b_bcount);
|
||||
#endif
|
||||
cb[0] = cbp;
|
||||
if (cs->sc_cflags & CCDF_MIRROR &&
|
||||
(cbp->cb_buf.b_flags & B_READ) == 0) {
|
||||
/* mirror, start one more write */
|
||||
cbp = getccdbuf();
|
||||
bzero(cbp, sizeof (struct ccdbuf));
|
||||
*cbp = *cb[0];
|
||||
|
||||
/*
|
||||
* Note: both I/O's setup when reading from mirror, but only one
|
||||
* will be executed.
|
||||
*/
|
||||
if (cs->sc_cflags & CCDF_MIRROR) {
|
||||
/* mirror, setup second I/O */
|
||||
cbp = getccdbuf(cb[0]);
|
||||
cbp->cb_buf.b_dev = ci2->ci_dev;
|
||||
cbp->cb_buf.b_vp = ci2->ci_vp;
|
||||
LIST_INIT(&cbp->cb_buf.b_dep);
|
||||
BUF_LOCKINIT(&cbp->cb_buf);
|
||||
BUF_LOCK(&cbp->cb_buf, LK_EXCLUSIVE);
|
||||
cbp->cb_comp = ci2 - cs->sc_cinfo;
|
||||
cb[1] = cbp;
|
||||
/* link together the ccdbuf's and clear "mirror done" flag */
|
||||
@ -944,8 +1094,8 @@ ccdbuffer(cb, cs, bp, bn, addr, bcount)
|
||||
|
||||
static void
|
||||
ccdintr(cs, bp)
|
||||
register struct ccd_softc *cs;
|
||||
register struct buf *bp;
|
||||
struct ccd_softc *cs;
|
||||
struct buf *bp;
|
||||
{
|
||||
#ifdef DEBUG
|
||||
if (ccddebug & CCDB_FOLLOW)
|
||||
@ -969,8 +1119,8 @@ static void
|
||||
ccdiodone(cbp)
|
||||
struct ccdbuf *cbp;
|
||||
{
|
||||
register struct buf *bp = cbp->cb_obp;
|
||||
register int unit = cbp->cb_unit;
|
||||
struct buf *bp = cbp->cb_obp;
|
||||
int unit = cbp->cb_unit;
|
||||
int count, s;
|
||||
|
||||
s = splbio();
|
||||
@ -986,27 +1136,87 @@ ccdiodone(cbp)
|
||||
cbp->cb_buf.b_bcount);
|
||||
}
|
||||
#endif
|
||||
/*
|
||||
* If an error occured, report it. If this is a mirrored
|
||||
* configuration and the first of two possible reads, do not
|
||||
* set the error in the bp yet because the second read may
|
||||
* succeed.
|
||||
*/
|
||||
|
||||
if (cbp->cb_buf.b_flags & B_ERROR) {
|
||||
bp->b_flags |= B_ERROR;
|
||||
bp->b_error = cbp->cb_buf.b_error ? cbp->cb_buf.b_error : EIO;
|
||||
#ifdef DEBUG
|
||||
printf("ccd%d: error %d on component %d\n",
|
||||
unit, bp->b_error, cbp->cb_comp);
|
||||
#endif
|
||||
const char *msg = "";
|
||||
|
||||
if ((ccd_softc[unit].sc_cflags & CCDF_MIRROR) &&
|
||||
(cbp->cb_buf.b_flags & B_READ) &&
|
||||
(cbp->cb_pflags & CCDPF_MIRROR_DONE) == 0) {
|
||||
/*
|
||||
* We will try our read on the other disk down
|
||||
* below, also reverse the default pick so if we
|
||||
* are doing a scan we do not keep hitting the
|
||||
* bad disk first.
|
||||
*/
|
||||
struct ccd_softc *cs = &ccd_softc[unit];
|
||||
|
||||
msg = ", trying other disk";
|
||||
cs->sc_pick = 1 - cs->sc_pick;
|
||||
cs->sc_blk[cs->sc_pick] = bp->b_blkno;
|
||||
} else {
|
||||
bp->b_flags |= B_ERROR;
|
||||
bp->b_error = cbp->cb_buf.b_error ?
|
||||
cbp->cb_buf.b_error : EIO;
|
||||
}
|
||||
printf("ccd%d: error %d on component %d block %d (ccd block %d)%s\n",
|
||||
unit, bp->b_error, cbp->cb_comp,
|
||||
(int)cbp->cb_buf.b_blkno, bp->b_blkno, msg);
|
||||
}
|
||||
|
||||
if (ccd_softc[unit].sc_cflags & CCDF_MIRROR &&
|
||||
(cbp->cb_buf.b_flags & B_READ) == 0)
|
||||
if ((cbp->cb_pflags & CCDPF_MIRROR_DONE) == 0) {
|
||||
/* I'm done before my counterpart, so just set
|
||||
partner's flag and return */
|
||||
cbp->cb_mirror->cb_pflags |= CCDPF_MIRROR_DONE;
|
||||
putccdbuf(cbp);
|
||||
splx(s);
|
||||
return;
|
||||
/*
|
||||
* Process mirror. If we are writing, I/O has been initiated on both
|
||||
* buffers and we fall through only after both are finished.
|
||||
*
|
||||
* If we are reading only one I/O is initiated at a time. If an
|
||||
* error occurs we initiate the second I/O and return, otherwise
|
||||
* we free the second I/O without initiating it.
|
||||
*/
|
||||
|
||||
if (ccd_softc[unit].sc_cflags & CCDF_MIRROR) {
|
||||
if ((cbp->cb_buf.b_flags & B_READ) == 0) {
|
||||
/*
|
||||
* When writing, handshake with the second buffer
|
||||
* to determine when both are done. If both are not
|
||||
* done, return here.
|
||||
*/
|
||||
if ((cbp->cb_pflags & CCDPF_MIRROR_DONE) == 0) {
|
||||
cbp->cb_mirror->cb_pflags |= CCDPF_MIRROR_DONE;
|
||||
putccdbuf(cbp);
|
||||
splx(s);
|
||||
return;
|
||||
}
|
||||
} else {
|
||||
/*
|
||||
* When reading, either dispose of the second buffer
|
||||
* or initiate I/O on the second buffer if an error
|
||||
* occured with this one.
|
||||
*/
|
||||
if ((cbp->cb_pflags & CCDPF_MIRROR_DONE) == 0) {
|
||||
if (cbp->cb_buf.b_flags & B_ERROR) {
|
||||
cbp->cb_mirror->cb_pflags |=
|
||||
CCDPF_MIRROR_DONE;
|
||||
VOP_STRATEGY(
|
||||
cbp->cb_mirror->cb_buf.b_vp,
|
||||
&cbp->cb_mirror->cb_buf
|
||||
);
|
||||
putccdbuf(cbp);
|
||||
splx(s);
|
||||
return;
|
||||
} else {
|
||||
putccdbuf(cbp->cb_mirror);
|
||||
/* fall through */
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
/*
|
||||
* use b_bufsize to determine how big the original request was rather
|
||||
* then b_bcount, because b_bcount may have been truncated for EOF.
|
||||
@ -1509,7 +1719,7 @@ static void
|
||||
printiinfo(ii)
|
||||
struct ccdiinfo *ii;
|
||||
{
|
||||
register int ix, i;
|
||||
int ix, i;
|
||||
|
||||
for (ix = 0; ii->ii_ndisk; ix++, ii++) {
|
||||
printf(" itab[%d]: #dk %d sblk %d soff %d",
|
||||
|
||||
@ -146,6 +146,7 @@ SYSCTL_INT(_debug, OID_AUTO, ccddebug, CTLFLAG_RW, &ccddebug, 0, "");
|
||||
struct ccdbuf {
|
||||
struct buf cb_buf; /* new I/O buf */
|
||||
struct buf *cb_obp; /* ptr. to original I/O buf */
|
||||
struct ccdbuf *cb_freenext; /* free list link */
|
||||
int cb_unit; /* target unit */
|
||||
int cb_comp; /* target component */
|
||||
int cb_pflags; /* mirror/parity status flag */
|
||||
@ -155,11 +156,6 @@ struct ccdbuf {
|
||||
/* bits in cb_pflags */
|
||||
#define CCDPF_MIRROR_DONE 1 /* if set, mirror counterpart is done */
|
||||
|
||||
#define getccdbuf() \
|
||||
((struct ccdbuf *)malloc(sizeof(struct ccdbuf), M_DEVBUF, M_WAITOK))
|
||||
#define putccdbuf(cbp) \
|
||||
free((caddr_t)(cbp), M_DEVBUF)
|
||||
|
||||
#define CCDLABELDEV(dev) \
|
||||
(makedev(major((dev)), dkmakeminor(ccdunit((dev)), 0, RAW_PART)))
|
||||
|
||||
@ -170,6 +166,8 @@ static d_ioctl_t ccdioctl;
|
||||
static d_dump_t ccddump;
|
||||
static d_psize_t ccdsize;
|
||||
|
||||
#define NCCDFREEHIWAT 16
|
||||
|
||||
#define CDEV_MAJOR 74
|
||||
#define BDEV_MAJOR 21
|
||||
|
||||
@ -221,8 +219,70 @@ static void printiinfo __P((struct ccdiinfo *));
|
||||
/* Non-private for the benefit of libkvm. */
|
||||
struct ccd_softc *ccd_softc;
|
||||
struct ccddevice *ccddevs;
|
||||
struct ccdbuf *ccdfreebufs;
|
||||
static int numccdfreebufs;
|
||||
static int numccd = 0;
|
||||
|
||||
/*
|
||||
* getccdbuf() - Allocate and zero a ccd buffer.
|
||||
*
|
||||
* This routine is called at splbio().
|
||||
*/
|
||||
|
||||
static __inline
|
||||
struct ccdbuf *
|
||||
getccdbuf(struct ccdbuf *cpy)
|
||||
{
|
||||
struct ccdbuf *cbp;
|
||||
|
||||
/*
|
||||
* Allocate from freelist or malloc as necessary
|
||||
*/
|
||||
if ((cbp = ccdfreebufs) != NULL) {
|
||||
ccdfreebufs = cbp->cb_freenext;
|
||||
--numccdfreebufs;
|
||||
} else {
|
||||
cbp = malloc(sizeof(struct ccdbuf), M_DEVBUF, M_WAITOK);
|
||||
}
|
||||
|
||||
/*
|
||||
* Used by mirroring code
|
||||
*/
|
||||
if (cpy)
|
||||
bcopy(cpy, cbp, sizeof(struct ccdbuf));
|
||||
else
|
||||
bzero(cbp, sizeof(struct ccdbuf));
|
||||
|
||||
/*
|
||||
* independant struct buf initialization
|
||||
*/
|
||||
LIST_INIT(&cbp->cb_buf.b_dep);
|
||||
BUF_LOCKINIT(&cbp->cb_buf);
|
||||
BUF_LOCK(&cbp->cb_buf, LK_EXCLUSIVE);
|
||||
|
||||
return(cbp);
|
||||
}
|
||||
|
||||
/*
|
||||
* putccdbuf() - Allocate and zero a ccd buffer.
|
||||
*
|
||||
* This routine is called at splbio().
|
||||
*/
|
||||
|
||||
static __inline
|
||||
void
|
||||
putccdbuf(struct ccdbuf *cbp)
|
||||
{
|
||||
if (numccdfreebufs < NCCDFREEHIWAT) {
|
||||
cbp->cb_freenext = ccdfreebufs;
|
||||
ccdfreebufs = cbp;
|
||||
++numccdfreebufs;
|
||||
} else {
|
||||
free((caddr_t)cbp, M_DEVBUF);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Number of blocks to untouched in front of a component partition.
|
||||
* This is to avoid violating its disklabel area when it starts at the
|
||||
@ -301,17 +361,17 @@ ccdinit(ccd, cpaths, p)
|
||||
char **cpaths;
|
||||
struct proc *p;
|
||||
{
|
||||
register struct ccd_softc *cs = &ccd_softc[ccd->ccd_unit];
|
||||
register struct ccdcinfo *ci = NULL; /* XXX */
|
||||
register size_t size;
|
||||
register int ix;
|
||||
struct ccd_softc *cs = &ccd_softc[ccd->ccd_unit];
|
||||
struct ccdcinfo *ci = NULL; /* XXX */
|
||||
size_t size;
|
||||
int ix;
|
||||
struct vnode *vp;
|
||||
size_t minsize;
|
||||
int maxsecsize;
|
||||
struct partinfo dpart;
|
||||
struct ccdgeom *ccg = &cs->sc_geom;
|
||||
char tmppath[MAXPATHLEN];
|
||||
int error;
|
||||
int error = 0;
|
||||
|
||||
#ifdef DEBUG
|
||||
if (ccddebug & (CCDB_FOLLOW|CCDB_INIT))
|
||||
@ -348,12 +408,7 @@ ccdinit(ccd, cpaths, p)
|
||||
printf("ccd%d: can't copy path, error = %d\n",
|
||||
ccd->ccd_unit, error);
|
||||
#endif
|
||||
while (ci > cs->sc_cinfo) {
|
||||
ci--;
|
||||
free(ci->ci_path, M_DEVBUF);
|
||||
}
|
||||
free(cs->sc_cinfo, M_DEVBUF);
|
||||
return (error);
|
||||
goto fail;
|
||||
}
|
||||
ci->ci_path = malloc(ci->ci_pathlen, M_DEVBUF, M_WAITOK);
|
||||
bcopy(tmppath, ci->ci_path, ci->ci_pathlen);
|
||||
@ -370,12 +425,7 @@ ccdinit(ccd, cpaths, p)
|
||||
printf("ccd%d: %s: ioctl failed, error = %d\n",
|
||||
ccd->ccd_unit, ci->ci_path, error);
|
||||
#endif
|
||||
while (ci >= cs->sc_cinfo) {
|
||||
free(ci->ci_path, M_DEVBUF);
|
||||
ci--;
|
||||
}
|
||||
free(cs->sc_cinfo, M_DEVBUF);
|
||||
return (error);
|
||||
goto fail;
|
||||
}
|
||||
if (dpart.part->p_fstype == FS_BSDFFS) {
|
||||
maxsecsize =
|
||||
@ -388,12 +438,8 @@ ccdinit(ccd, cpaths, p)
|
||||
printf("ccd%d: %s: incorrect partition type\n",
|
||||
ccd->ccd_unit, ci->ci_path);
|
||||
#endif
|
||||
while (ci >= cs->sc_cinfo) {
|
||||
free(ci->ci_path, M_DEVBUF);
|
||||
ci--;
|
||||
}
|
||||
free(cs->sc_cinfo, M_DEVBUF);
|
||||
return (EFTYPE);
|
||||
error = EFTYPE;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
/*
|
||||
@ -410,12 +456,8 @@ ccdinit(ccd, cpaths, p)
|
||||
printf("ccd%d: %s: size == 0\n",
|
||||
ccd->ccd_unit, ci->ci_path);
|
||||
#endif
|
||||
while (ci >= cs->sc_cinfo) {
|
||||
free(ci->ci_path, M_DEVBUF);
|
||||
ci--;
|
||||
}
|
||||
free(cs->sc_cinfo, M_DEVBUF);
|
||||
return (ENODEV);
|
||||
error = ENODEV;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
if (minsize == 0 || size < minsize)
|
||||
@ -435,42 +477,52 @@ ccdinit(ccd, cpaths, p)
|
||||
printf("ccd%d: interleave must be at least %d\n",
|
||||
ccd->ccd_unit, (maxsecsize / DEV_BSIZE));
|
||||
#endif
|
||||
while (ci >= cs->sc_cinfo) {
|
||||
free(ci->ci_path, M_DEVBUF);
|
||||
ci--;
|
||||
}
|
||||
free(cs->sc_cinfo, M_DEVBUF);
|
||||
return (EINVAL);
|
||||
error = EINVAL;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
/*
|
||||
* If uniform interleave is desired set all sizes to that of
|
||||
* the smallest component.
|
||||
* the smallest component. This will guarentee that a single
|
||||
* interleave table is generated.
|
||||
*
|
||||
* Lost space must be taken into account when calculating the
|
||||
* overall size. Half the space is lost when CCDF_MIRROR is
|
||||
* specified. One disk is lost when CCDF_PARITY is specified.
|
||||
*/
|
||||
if (ccd->ccd_flags & CCDF_UNIFORM) {
|
||||
for (ci = cs->sc_cinfo;
|
||||
ci < &cs->sc_cinfo[cs->sc_nccdisks]; ci++)
|
||||
ci < &cs->sc_cinfo[cs->sc_nccdisks]; ci++) {
|
||||
ci->ci_size = minsize;
|
||||
}
|
||||
if (ccd->ccd_flags & CCDF_MIRROR) {
|
||||
/*
|
||||
* Check to see if an even number of components
|
||||
* have been specified.
|
||||
* have been specified. The interleave must also
|
||||
* be non-zero in order for us to be able to
|
||||
* guarentee the topology.
|
||||
*/
|
||||
if (cs->sc_nccdisks % 2) {
|
||||
printf("ccd%d: mirroring requires an even number of disks\n", ccd->ccd_unit );
|
||||
while (ci > cs->sc_cinfo) {
|
||||
ci--;
|
||||
free(ci->ci_path, M_DEVBUF);
|
||||
}
|
||||
free(cs->sc_cinfo, M_DEVBUF);
|
||||
return (EINVAL);
|
||||
error = EINVAL;
|
||||
goto fail;
|
||||
}
|
||||
if (cs->sc_ileave == 0) {
|
||||
printf("ccd%d: an interleave must be specified when mirroring\n", ccd->ccd_unit);
|
||||
error = EINVAL;
|
||||
goto fail;
|
||||
}
|
||||
cs->sc_size = (cs->sc_nccdisks/2) * minsize;
|
||||
}
|
||||
else if (ccd->ccd_flags & CCDF_PARITY)
|
||||
} else if (ccd->ccd_flags & CCDF_PARITY) {
|
||||
cs->sc_size = (cs->sc_nccdisks-1) * minsize;
|
||||
else
|
||||
} else {
|
||||
if (cs->sc_ileave == 0) {
|
||||
printf("ccd%d: an interleave must be specified when using parity\n", ccd->ccd_unit);
|
||||
error = EINVAL;
|
||||
goto fail;
|
||||
}
|
||||
cs->sc_size = cs->sc_nccdisks * minsize;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
@ -499,25 +551,36 @@ ccdinit(ccd, cpaths, p)
|
||||
cs->sc_cflags = ccd->ccd_flags; /* So we can find out later... */
|
||||
cs->sc_unit = ccd->ccd_unit;
|
||||
return (0);
|
||||
fail:
|
||||
while (ci > cs->sc_cinfo) {
|
||||
ci--;
|
||||
free(ci->ci_path, M_DEVBUF);
|
||||
}
|
||||
free(cs->sc_cinfo, M_DEVBUF);
|
||||
return (error);
|
||||
}
|
||||
|
||||
static void
|
||||
ccdinterleave(cs, unit)
|
||||
register struct ccd_softc *cs;
|
||||
struct ccd_softc *cs;
|
||||
int unit;
|
||||
{
|
||||
register struct ccdcinfo *ci, *smallci;
|
||||
register struct ccdiinfo *ii;
|
||||
register daddr_t bn, lbn;
|
||||
register int ix;
|
||||
struct ccdcinfo *ci, *smallci;
|
||||
struct ccdiinfo *ii;
|
||||
daddr_t bn, lbn;
|
||||
int ix;
|
||||
u_long size;
|
||||
|
||||
#ifdef DEBUG
|
||||
if (ccddebug & CCDB_INIT)
|
||||
printf("ccdinterleave(%x): ileave %d\n", cs, cs->sc_ileave);
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Allocate an interleave table.
|
||||
* Allocate an interleave table. The worst case occurs when each
|
||||
* of N disks is of a different size, resulting in N interleave
|
||||
* tables.
|
||||
*
|
||||
* Chances are this is too big, but we don't care.
|
||||
*/
|
||||
size = (cs->sc_nccdisks + 1) * sizeof(struct ccdiinfo);
|
||||
@ -527,6 +590,8 @@ ccdinterleave(cs, unit)
|
||||
/*
|
||||
* Trivial case: no interleave (actually interleave of disk size).
|
||||
* Each table entry represents a single component in its entirety.
|
||||
*
|
||||
* An interleave of 0 may not be used with a mirror or parity setup.
|
||||
*/
|
||||
if (cs->sc_ileave == 0) {
|
||||
bn = 0;
|
||||
@ -556,7 +621,10 @@ ccdinterleave(cs, unit)
|
||||
size = 0;
|
||||
bn = lbn = 0;
|
||||
for (ii = cs->sc_itable; ; ii++) {
|
||||
/* Allocate space for ii_index. */
|
||||
/*
|
||||
* Allocate space for ii_index. We might allocate more then
|
||||
* we use.
|
||||
*/
|
||||
ii->ii_index = malloc((sizeof(int) * cs->sc_nccdisks),
|
||||
M_DEVBUF, M_WAITOK);
|
||||
|
||||
@ -564,12 +632,14 @@ ccdinterleave(cs, unit)
|
||||
* Locate the smallest of the remaining components
|
||||
*/
|
||||
smallci = NULL;
|
||||
for (ci = cs->sc_cinfo;
|
||||
ci < &cs->sc_cinfo[cs->sc_nccdisks]; ci++)
|
||||
for (ci = cs->sc_cinfo; ci < &cs->sc_cinfo[cs->sc_nccdisks];
|
||||
ci++) {
|
||||
if (ci->ci_size > size &&
|
||||
(smallci == NULL ||
|
||||
ci->ci_size < smallci->ci_size))
|
||||
ci->ci_size < smallci->ci_size)) {
|
||||
smallci = ci;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Nobody left, all done
|
||||
@ -580,9 +650,15 @@ ccdinterleave(cs, unit)
|
||||
}
|
||||
|
||||
/*
|
||||
* Record starting logical block and component offset
|
||||
* Record starting logical block using an sc_ileave blocksize.
|
||||
*/
|
||||
ii->ii_startblk = bn / cs->sc_ileave;
|
||||
|
||||
/*
|
||||
* Record starting comopnent block using an sc_ileave
|
||||
* blocksize. This value is relative to the beginning of
|
||||
* a component disk.
|
||||
*/
|
||||
ii->ii_startoff = lbn;
|
||||
|
||||
/*
|
||||
@ -590,10 +666,12 @@ ccdinterleave(cs, unit)
|
||||
* and record their indices.
|
||||
*/
|
||||
ix = 0;
|
||||
for (ci = cs->sc_cinfo;
|
||||
ci < &cs->sc_cinfo[cs->sc_nccdisks]; ci++)
|
||||
if (ci->ci_size >= smallci->ci_size)
|
||||
for (ci = cs->sc_cinfo;
|
||||
ci < &cs->sc_cinfo[cs->sc_nccdisks]; ci++) {
|
||||
if (ci->ci_size >= smallci->ci_size) {
|
||||
ii->ii_index[ix++] = ci - cs->sc_cinfo;
|
||||
}
|
||||
}
|
||||
ii->ii_ndisk = ix;
|
||||
bn += ix * (smallci->ci_size - size);
|
||||
lbn = smallci->ci_size / cs->sc_ileave;
|
||||
@ -710,11 +788,11 @@ ccdclose(dev, flags, fmt, p)
|
||||
|
||||
static void
|
||||
ccdstrategy(bp)
|
||||
register struct buf *bp;
|
||||
struct buf *bp;
|
||||
{
|
||||
register int unit = ccdunit(bp->b_dev);
|
||||
register struct ccd_softc *cs = &ccd_softc[unit];
|
||||
register int s;
|
||||
int unit = ccdunit(bp->b_dev);
|
||||
struct ccd_softc *cs = &ccd_softc[unit];
|
||||
int s;
|
||||
int wlabel;
|
||||
struct disklabel *lp;
|
||||
|
||||
@ -758,10 +836,10 @@ done:
|
||||
|
||||
static void
|
||||
ccdstart(cs, bp)
|
||||
register struct ccd_softc *cs;
|
||||
register struct buf *bp;
|
||||
struct ccd_softc *cs;
|
||||
struct buf *bp;
|
||||
{
|
||||
register long bcount, rcount;
|
||||
long bcount, rcount;
|
||||
struct ccdbuf *cbp[4];
|
||||
/* XXX! : 2 reads and 2 writes for RAID 4/5 */
|
||||
caddr_t addr;
|
||||
@ -792,14 +870,44 @@ ccdstart(cs, bp)
|
||||
for (bcount = bp->b_bcount; bcount > 0; bcount -= rcount) {
|
||||
ccdbuffer(cbp, cs, bp, bn, addr, bcount);
|
||||
rcount = cbp[0]->cb_buf.b_bcount;
|
||||
if ((cbp[0]->cb_buf.b_flags & B_READ) == 0)
|
||||
cbp[0]->cb_buf.b_vp->v_numoutput++;
|
||||
VOP_STRATEGY(cbp[0]->cb_buf.b_vp, &cbp[0]->cb_buf);
|
||||
if (cs->sc_cflags & CCDF_MIRROR &&
|
||||
(cbp[0]->cb_buf.b_flags & B_READ) == 0) {
|
||||
/* mirror, start another write */
|
||||
cbp[1]->cb_buf.b_vp->v_numoutput++;
|
||||
VOP_STRATEGY(cbp[1]->cb_buf.b_vp, &cbp[1]->cb_buf);
|
||||
|
||||
if (cs->sc_cflags & CCDF_MIRROR) {
|
||||
/*
|
||||
* Mirroring. Writes go to both disks, reads are
|
||||
* taken from whichever disk seems most appropriate.
|
||||
*
|
||||
* We attempt to localize reads to the disk whos arm
|
||||
* is nearest the read request. We ignore seeks due
|
||||
* to writes when making this determination and we
|
||||
* also try to avoid hogging.
|
||||
*/
|
||||
if ((cbp[0]->cb_buf.b_flags & B_READ) == 0) {
|
||||
cbp[0]->cb_buf.b_vp->v_numoutput++;
|
||||
cbp[1]->cb_buf.b_vp->v_numoutput++;
|
||||
VOP_STRATEGY(cbp[0]->cb_buf.b_vp,
|
||||
&cbp[0]->cb_buf);
|
||||
VOP_STRATEGY(cbp[1]->cb_buf.b_vp,
|
||||
&cbp[1]->cb_buf);
|
||||
} else {
|
||||
int pick = cs->sc_pick;
|
||||
daddr_t range = cs->sc_size / 16;
|
||||
|
||||
if (bn < cs->sc_blk[pick] - range ||
|
||||
bn > cs->sc_blk[pick] + range
|
||||
) {
|
||||
cs->sc_pick = pick = 1 - pick;
|
||||
}
|
||||
cs->sc_blk[pick] = bn + btodb(rcount);
|
||||
VOP_STRATEGY(cbp[pick]->cb_buf.b_vp,
|
||||
&cbp[pick]->cb_buf);
|
||||
}
|
||||
} else {
|
||||
/*
|
||||
* Not mirroring
|
||||
*/
|
||||
if ((cbp[0]->cb_buf.b_flags & B_READ) == 0)
|
||||
cbp[0]->cb_buf.b_vp->v_numoutput++;
|
||||
VOP_STRATEGY(cbp[0]->cb_buf.b_vp, &cbp[0]->cb_buf);
|
||||
}
|
||||
bn += btodb(rcount);
|
||||
addr += rcount;
|
||||
@ -811,17 +919,17 @@ ccdstart(cs, bp)
|
||||
*/
|
||||
static void
|
||||
ccdbuffer(cb, cs, bp, bn, addr, bcount)
|
||||
register struct ccdbuf **cb;
|
||||
register struct ccd_softc *cs;
|
||||
struct ccdbuf **cb;
|
||||
struct ccd_softc *cs;
|
||||
struct buf *bp;
|
||||
daddr_t bn;
|
||||
caddr_t addr;
|
||||
long bcount;
|
||||
{
|
||||
register struct ccdcinfo *ci, *ci2 = NULL; /* XXX */
|
||||
register struct ccdbuf *cbp;
|
||||
register daddr_t cbn, cboff;
|
||||
register off_t cbc;
|
||||
struct ccdcinfo *ci, *ci2 = NULL; /* XXX */
|
||||
struct ccdbuf *cbp;
|
||||
daddr_t cbn, cboff;
|
||||
off_t cbc;
|
||||
|
||||
#ifdef DEBUG
|
||||
if (ccddebug & CCDB_IO)
|
||||
@ -834,61 +942,108 @@ ccdbuffer(cb, cs, bp, bn, addr, bcount)
|
||||
cbn = bn;
|
||||
cboff = 0;
|
||||
|
||||
/*
|
||||
* Serially concatenated
|
||||
*/
|
||||
if (cs->sc_ileave == 0) {
|
||||
register daddr_t sblk;
|
||||
/*
|
||||
* Serially concatenated and neither a mirror nor a parity
|
||||
* config. This is a special case.
|
||||
*/
|
||||
daddr_t sblk;
|
||||
|
||||
sblk = 0;
|
||||
for (ci = cs->sc_cinfo; cbn >= sblk + ci->ci_size; ci++)
|
||||
sblk += ci->ci_size;
|
||||
cbn -= sblk;
|
||||
}
|
||||
/*
|
||||
* Interleaved
|
||||
*/
|
||||
else {
|
||||
register struct ccdiinfo *ii;
|
||||
} else {
|
||||
struct ccdiinfo *ii;
|
||||
int ccdisk, off;
|
||||
|
||||
cboff = cbn % cs->sc_ileave;
|
||||
cbn /= cs->sc_ileave;
|
||||
for (ii = cs->sc_itable; ii->ii_ndisk; ii++)
|
||||
/*
|
||||
* Calculate cbn, the logical superblock (sc_ileave chunks),
|
||||
* and cboff, a normal block offset (DEV_BSIZE chunks) relative
|
||||
* to cbn.
|
||||
*/
|
||||
cboff = cbn % cs->sc_ileave; /* DEV_BSIZE gran */
|
||||
cbn = cbn / cs->sc_ileave; /* DEV_BSIZE * ileave gran */
|
||||
|
||||
/*
|
||||
* Figure out which interleave table to use.
|
||||
*/
|
||||
for (ii = cs->sc_itable; ii->ii_ndisk; ii++) {
|
||||
if (ii->ii_startblk > cbn)
|
||||
break;
|
||||
}
|
||||
ii--;
|
||||
|
||||
/*
|
||||
* off is the logical superblock relative to the beginning
|
||||
* of this interleave block.
|
||||
*/
|
||||
off = cbn - ii->ii_startblk;
|
||||
|
||||
/*
|
||||
* We must calculate which disk component to use (ccdisk),
|
||||
* and recalculate cbn to be the superblock relative to
|
||||
* the beginning of the component. This is typically done by
|
||||
* adding 'off' and ii->ii_startoff together. However, 'off'
|
||||
* must typically be divided by the number of components in
|
||||
* this interleave array to be properly convert it from a
|
||||
* CCD-relative logical superblock number to a
|
||||
* component-relative superblock number.
|
||||
*/
|
||||
if (ii->ii_ndisk == 1) {
|
||||
/*
|
||||
* When we have just one disk, it can't be a mirror
|
||||
* or a parity config.
|
||||
*/
|
||||
ccdisk = ii->ii_index[0];
|
||||
cbn = ii->ii_startoff + off;
|
||||
} else {
|
||||
if (cs->sc_cflags & CCDF_MIRROR) {
|
||||
ccdisk = ii->ii_index[off % (ii->ii_ndisk/2)];
|
||||
cbn = ii->ii_startoff + off / (ii->ii_ndisk/2);
|
||||
/* mirrored data */
|
||||
ci2 = &cs->sc_cinfo[ccdisk + ii->ii_ndisk/2];
|
||||
}
|
||||
else if (cs->sc_cflags & CCDF_PARITY) {
|
||||
ccdisk = ii->ii_index[off % (ii->ii_ndisk-1)];
|
||||
cbn = ii->ii_startoff + off / (ii->ii_ndisk-1);
|
||||
/*
|
||||
* We have forced a uniform mapping, resulting
|
||||
* in a single interleave array. We double
|
||||
* up on the first half of the available
|
||||
* components and our mirror is in the second
|
||||
* half. This only works with a single
|
||||
* interleave array because doubling up
|
||||
* doubles the number of sectors, so there
|
||||
* cannot be another interleave array because
|
||||
* the next interleave array's calculations
|
||||
* would be off.
|
||||
*/
|
||||
int ndisk2 = ii->ii_ndisk / 2;
|
||||
ccdisk = ii->ii_index[off % ndisk2];
|
||||
cbn = ii->ii_startoff + off / ndisk2;
|
||||
ci2 = &cs->sc_cinfo[ccdisk + ndisk2];
|
||||
} else if (cs->sc_cflags & CCDF_PARITY) {
|
||||
/*
|
||||
* XXX not implemented yet
|
||||
*/
|
||||
int ndisk2 = ii->ii_ndisk - 1;
|
||||
ccdisk = ii->ii_index[off % ndisk2];
|
||||
cbn = ii->ii_startoff + off / ndisk2;
|
||||
if (cbn % ii->ii_ndisk <= ccdisk)
|
||||
ccdisk++;
|
||||
}
|
||||
else {
|
||||
} else {
|
||||
ccdisk = ii->ii_index[off % ii->ii_ndisk];
|
||||
cbn = ii->ii_startoff + off / ii->ii_ndisk;
|
||||
}
|
||||
}
|
||||
cbn *= cs->sc_ileave;
|
||||
|
||||
ci = &cs->sc_cinfo[ccdisk];
|
||||
|
||||
/*
|
||||
* Convert cbn from a superblock to a normal block so it
|
||||
* can be used to calculate (along with cboff) the normal
|
||||
* block index into this particular disk.
|
||||
*/
|
||||
cbn *= cs->sc_ileave;
|
||||
}
|
||||
|
||||
/*
|
||||
* Fill in the component buf structure.
|
||||
*/
|
||||
cbp = getccdbuf();
|
||||
bzero(cbp, sizeof (struct ccdbuf));
|
||||
cbp = getccdbuf(NULL);
|
||||
cbp->cb_buf.b_flags = bp->b_flags | B_CALL;
|
||||
cbp->cb_buf.b_iodone = (void (*)(struct buf *))ccdiodone;
|
||||
cbp->cb_buf.b_dev = ci->ci_dev; /* XXX */
|
||||
@ -896,10 +1051,6 @@ ccdbuffer(cb, cs, bp, bn, addr, bcount)
|
||||
cbp->cb_buf.b_offset = dbtob(cbn + cboff + CCD_OFFSET);
|
||||
cbp->cb_buf.b_data = addr;
|
||||
cbp->cb_buf.b_vp = ci->ci_vp;
|
||||
LIST_INIT(&cbp->cb_buf.b_dep);
|
||||
BUF_LOCKINIT(&cbp->cb_buf);
|
||||
BUF_LOCK(&cbp->cb_buf, LK_EXCLUSIVE);
|
||||
cbp->cb_buf.b_resid = 0;
|
||||
if (cs->sc_ileave == 0)
|
||||
cbc = dbtob((off_t)(ci->ci_size - cbn));
|
||||
else
|
||||
@ -921,17 +1072,16 @@ ccdbuffer(cb, cs, bp, bn, addr, bcount)
|
||||
cbp->cb_buf.b_data, cbp->cb_buf.b_bcount);
|
||||
#endif
|
||||
cb[0] = cbp;
|
||||
if (cs->sc_cflags & CCDF_MIRROR &&
|
||||
(cbp->cb_buf.b_flags & B_READ) == 0) {
|
||||
/* mirror, start one more write */
|
||||
cbp = getccdbuf();
|
||||
bzero(cbp, sizeof (struct ccdbuf));
|
||||
*cbp = *cb[0];
|
||||
|
||||
/*
|
||||
* Note: both I/O's setup when reading from mirror, but only one
|
||||
* will be executed.
|
||||
*/
|
||||
if (cs->sc_cflags & CCDF_MIRROR) {
|
||||
/* mirror, setup second I/O */
|
||||
cbp = getccdbuf(cb[0]);
|
||||
cbp->cb_buf.b_dev = ci2->ci_dev;
|
||||
cbp->cb_buf.b_vp = ci2->ci_vp;
|
||||
LIST_INIT(&cbp->cb_buf.b_dep);
|
||||
BUF_LOCKINIT(&cbp->cb_buf);
|
||||
BUF_LOCK(&cbp->cb_buf, LK_EXCLUSIVE);
|
||||
cbp->cb_comp = ci2 - cs->sc_cinfo;
|
||||
cb[1] = cbp;
|
||||
/* link together the ccdbuf's and clear "mirror done" flag */
|
||||
@ -944,8 +1094,8 @@ ccdbuffer(cb, cs, bp, bn, addr, bcount)
|
||||
|
||||
static void
|
||||
ccdintr(cs, bp)
|
||||
register struct ccd_softc *cs;
|
||||
register struct buf *bp;
|
||||
struct ccd_softc *cs;
|
||||
struct buf *bp;
|
||||
{
|
||||
#ifdef DEBUG
|
||||
if (ccddebug & CCDB_FOLLOW)
|
||||
@ -969,8 +1119,8 @@ static void
|
||||
ccdiodone(cbp)
|
||||
struct ccdbuf *cbp;
|
||||
{
|
||||
register struct buf *bp = cbp->cb_obp;
|
||||
register int unit = cbp->cb_unit;
|
||||
struct buf *bp = cbp->cb_obp;
|
||||
int unit = cbp->cb_unit;
|
||||
int count, s;
|
||||
|
||||
s = splbio();
|
||||
@ -986,27 +1136,87 @@ ccdiodone(cbp)
|
||||
cbp->cb_buf.b_bcount);
|
||||
}
|
||||
#endif
|
||||
/*
|
||||
* If an error occured, report it. If this is a mirrored
|
||||
* configuration and the first of two possible reads, do not
|
||||
* set the error in the bp yet because the second read may
|
||||
* succeed.
|
||||
*/
|
||||
|
||||
if (cbp->cb_buf.b_flags & B_ERROR) {
|
||||
bp->b_flags |= B_ERROR;
|
||||
bp->b_error = cbp->cb_buf.b_error ? cbp->cb_buf.b_error : EIO;
|
||||
#ifdef DEBUG
|
||||
printf("ccd%d: error %d on component %d\n",
|
||||
unit, bp->b_error, cbp->cb_comp);
|
||||
#endif
|
||||
const char *msg = "";
|
||||
|
||||
if ((ccd_softc[unit].sc_cflags & CCDF_MIRROR) &&
|
||||
(cbp->cb_buf.b_flags & B_READ) &&
|
||||
(cbp->cb_pflags & CCDPF_MIRROR_DONE) == 0) {
|
||||
/*
|
||||
* We will try our read on the other disk down
|
||||
* below, also reverse the default pick so if we
|
||||
* are doing a scan we do not keep hitting the
|
||||
* bad disk first.
|
||||
*/
|
||||
struct ccd_softc *cs = &ccd_softc[unit];
|
||||
|
||||
msg = ", trying other disk";
|
||||
cs->sc_pick = 1 - cs->sc_pick;
|
||||
cs->sc_blk[cs->sc_pick] = bp->b_blkno;
|
||||
} else {
|
||||
bp->b_flags |= B_ERROR;
|
||||
bp->b_error = cbp->cb_buf.b_error ?
|
||||
cbp->cb_buf.b_error : EIO;
|
||||
}
|
||||
printf("ccd%d: error %d on component %d block %d (ccd block %d)%s\n",
|
||||
unit, bp->b_error, cbp->cb_comp,
|
||||
(int)cbp->cb_buf.b_blkno, bp->b_blkno, msg);
|
||||
}
|
||||
|
||||
if (ccd_softc[unit].sc_cflags & CCDF_MIRROR &&
|
||||
(cbp->cb_buf.b_flags & B_READ) == 0)
|
||||
if ((cbp->cb_pflags & CCDPF_MIRROR_DONE) == 0) {
|
||||
/* I'm done before my counterpart, so just set
|
||||
partner's flag and return */
|
||||
cbp->cb_mirror->cb_pflags |= CCDPF_MIRROR_DONE;
|
||||
putccdbuf(cbp);
|
||||
splx(s);
|
||||
return;
|
||||
/*
|
||||
* Process mirror. If we are writing, I/O has been initiated on both
|
||||
* buffers and we fall through only after both are finished.
|
||||
*
|
||||
* If we are reading only one I/O is initiated at a time. If an
|
||||
* error occurs we initiate the second I/O and return, otherwise
|
||||
* we free the second I/O without initiating it.
|
||||
*/
|
||||
|
||||
if (ccd_softc[unit].sc_cflags & CCDF_MIRROR) {
|
||||
if ((cbp->cb_buf.b_flags & B_READ) == 0) {
|
||||
/*
|
||||
* When writing, handshake with the second buffer
|
||||
* to determine when both are done. If both are not
|
||||
* done, return here.
|
||||
*/
|
||||
if ((cbp->cb_pflags & CCDPF_MIRROR_DONE) == 0) {
|
||||
cbp->cb_mirror->cb_pflags |= CCDPF_MIRROR_DONE;
|
||||
putccdbuf(cbp);
|
||||
splx(s);
|
||||
return;
|
||||
}
|
||||
} else {
|
||||
/*
|
||||
* When reading, either dispose of the second buffer
|
||||
* or initiate I/O on the second buffer if an error
|
||||
* occured with this one.
|
||||
*/
|
||||
if ((cbp->cb_pflags & CCDPF_MIRROR_DONE) == 0) {
|
||||
if (cbp->cb_buf.b_flags & B_ERROR) {
|
||||
cbp->cb_mirror->cb_pflags |=
|
||||
CCDPF_MIRROR_DONE;
|
||||
VOP_STRATEGY(
|
||||
cbp->cb_mirror->cb_buf.b_vp,
|
||||
&cbp->cb_mirror->cb_buf
|
||||
);
|
||||
putccdbuf(cbp);
|
||||
splx(s);
|
||||
return;
|
||||
} else {
|
||||
putccdbuf(cbp->cb_mirror);
|
||||
/* fall through */
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
/*
|
||||
* use b_bufsize to determine how big the original request was rather
|
||||
* then b_bcount, because b_bcount may have been truncated for EOF.
|
||||
@ -1509,7 +1719,7 @@ static void
|
||||
printiinfo(ii)
|
||||
struct ccdiinfo *ii;
|
||||
{
|
||||
register int ix, i;
|
||||
int ix, i;
|
||||
|
||||
for (ix = 0; ii->ii_ndisk; ix++, ii++) {
|
||||
printf(" itab[%d]: #dk %d sblk %d soff %d",
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user