return 0;
}
-#ifdef _NOTYET
-/*
- * NAME: dtRelocate()
- *
- * FUNCTION: relocate dtpage (internal or leaf) of directory;
- * This function is mainly used by defragfs utility.
- */
-int dtRelocate(tid_t tid, struct inode *ip, s64 lmxaddr, pxd_t * opxd,
- s64 nxaddr)
-{
- int rc = 0;
- struct metapage *mp, *pmp, *lmp, *rmp;
- dtpage_t *p, *pp, *rp = 0, *lp= 0;
- s64 bn;
- int index;
- struct btstack btstack;
- pxd_t *pxd;
- s64 oxaddr, nextbn, prevbn;
- int xlen, xsize;
- struct tlock *tlck;
- struct dt_lock *dtlck;
- struct pxd_lock *pxdlock;
- s8 *stbl;
- struct lv *lv;
-
- oxaddr = addressPXD(opxd);
- xlen = lengthPXD(opxd);
-
- jfs_info("dtRelocate: lmxaddr:%Ld xaddr:%Ld:%Ld xlen:%d",
- (long long)lmxaddr, (long long)oxaddr, (long long)nxaddr,
- xlen);
-
- /*
- * 1. get the internal parent dtpage covering
- * router entry for the tartget page to be relocated;
- */
- rc = dtSearchNode(ip, lmxaddr, opxd, &btstack);
- if (rc)
- return rc;
-
- /* retrieve search result */
- DT_GETSEARCH(ip, btstack.top, bn, pmp, pp, index);
- jfs_info("dtRelocate: parent router entry validated.");
-
- /*
- * 2. relocate the target dtpage
- */
- /* read in the target page from src extent */
- DT_GETPAGE(ip, oxaddr, mp, PSIZE, p, rc);
- if (rc) {
- /* release the pinned parent page */
- DT_PUTPAGE(pmp);
- return rc;
- }
-
- /*
- * read in sibling pages if any to update sibling pointers;
- */
- rmp = NULL;
- if (p->header.next) {
- nextbn = le64_to_cpu(p->header.next);
- DT_GETPAGE(ip, nextbn, rmp, PSIZE, rp, rc);
- if (rc) {
- DT_PUTPAGE(mp);
- DT_PUTPAGE(pmp);
- return (rc);
- }
- }
-
- lmp = NULL;
- if (p->header.prev) {
- prevbn = le64_to_cpu(p->header.prev);
- DT_GETPAGE(ip, prevbn, lmp, PSIZE, lp, rc);
- if (rc) {
- DT_PUTPAGE(mp);
- DT_PUTPAGE(pmp);
- if (rmp)
- DT_PUTPAGE(rmp);
- return (rc);
- }
- }
-
- /* at this point, all xtpages to be updated are in memory */
-
- /*
- * update sibling pointers of sibling dtpages if any;
- */
- if (lmp) {
- tlck = txLock(tid, ip, lmp, tlckDTREE | tlckRELINK);
- dtlck = (struct dt_lock *) & tlck->lock;
- /* linelock header */
- ASSERT(dtlck->index == 0);
- lv = & dtlck->lv[0];
- lv->offset = 0;
- lv->length = 1;
- dtlck->index++;
-
- lp->header.next = cpu_to_le64(nxaddr);
- DT_PUTPAGE(lmp);
- }
-
- if (rmp) {
- tlck = txLock(tid, ip, rmp, tlckDTREE | tlckRELINK);
- dtlck = (struct dt_lock *) & tlck->lock;
- /* linelock header */
- ASSERT(dtlck->index == 0);
- lv = & dtlck->lv[0];
- lv->offset = 0;
- lv->length = 1;
- dtlck->index++;
-
- rp->header.prev = cpu_to_le64(nxaddr);
- DT_PUTPAGE(rmp);
- }
-
- /*
- * update the target dtpage to be relocated
- *
- * write LOG_REDOPAGE of LOG_NEW type for dst page
- * for the whole target page (logredo() will apply
- * after image and update bmap for allocation of the
- * dst extent), and update bmap for allocation of
- * the dst extent;
- */
- tlck = txLock(tid, ip, mp, tlckDTREE | tlckNEW);
- dtlck = (struct dt_lock *) & tlck->lock;
- /* linelock header */
- ASSERT(dtlck->index == 0);
- lv = & dtlck->lv[0];
-
- /* update the self address in the dtpage header */
- pxd = &p->header.self;
- PXDaddress(pxd, nxaddr);
-
- /* the dst page is the same as the src page, i.e.,
- * linelock for afterimage of the whole page;
- */
- lv->offset = 0;
- lv->length = p->header.maxslot;
- dtlck->index++;
-
- /* update the buffer extent descriptor of the dtpage */
- xsize = xlen << JFS_SBI(ip->i_sb)->l2bsize;
-
- /* unpin the relocated page */
- DT_PUTPAGE(mp);
- jfs_info("dtRelocate: target dtpage relocated.");
-
- /* the moved extent is dtpage, then a LOG_NOREDOPAGE log rec
- * needs to be written (in logredo(), the LOG_NOREDOPAGE log rec
- * will also force a bmap update ).
- */
-
- /*
- * 3. acquire maplock for the source extent to be freed;
- */
- /* for dtpage relocation, write a LOG_NOREDOPAGE record
- * for the source dtpage (logredo() will init NoRedoPage
- * filter and will also update bmap for free of the source
- * dtpage), and upadte bmap for free of the source dtpage;
- */
- tlck = txMaplock(tid, ip, tlckDTREE | tlckFREE);
- pxdlock = (struct pxd_lock *) & tlck->lock;
- pxdlock->flag = mlckFREEPXD;
- PXDaddress(&pxdlock->pxd, oxaddr);
- PXDlength(&pxdlock->pxd, xlen);
- pxdlock->index = 1;
-
- /*
- * 4. update the parent router entry for relocation;
- *
- * acquire tlck for the parent entry covering the target dtpage;
- * write LOG_REDOPAGE to apply after image only;
- */
- jfs_info("dtRelocate: update parent router entry.");
- tlck = txLock(tid, ip, pmp, tlckDTREE | tlckENTRY);
- dtlck = (struct dt_lock *) & tlck->lock;
- lv = & dtlck->lv[dtlck->index];
-
- /* update the PXD with the new address */
- stbl = DT_GETSTBL(pp);
- pxd = (pxd_t *) & pp->slot[stbl[index]];
- PXDaddress(pxd, nxaddr);
- lv->offset = stbl[index];
- lv->length = 1;
- dtlck->index++;
-
- /* unpin the parent dtpage */
- DT_PUTPAGE(pmp);
-
- return rc;
-}
-
-/*
- * NAME: dtSearchNode()
- *
- * FUNCTION: Search for an dtpage containing a specified address
- * This function is mainly used by defragfs utility.
- *
- * NOTE: Search result on stack, the found page is pinned at exit.
- * The result page must be an internal dtpage.
- * lmxaddr give the address of the left most page of the
- * dtree level, in which the required dtpage resides.
- */
-static int dtSearchNode(struct inode *ip, s64 lmxaddr, pxd_t * kpxd,
- struct btstack * btstack)
-{
- int rc = 0;
- s64 bn;
- struct metapage *mp;
- dtpage_t *p;
- int psize = 288; /* initial in-line directory */
- s8 *stbl;
- int i;
- pxd_t *pxd;
- struct btframe *btsp;
-
- BT_CLR(btstack); /* reset stack */
-
- /*
- * descend tree to the level with specified leftmost page
- *
- * by convention, root bn = 0.
- */
- for (bn = 0;;) {
- /* get/pin the page to search */
- DT_GETPAGE(ip, bn, mp, psize, p, rc);
- if (rc)
- return rc;
-
- /* does the xaddr of leftmost page of the levevl
- * matches levevl search key ?
- */
- if (p->header.flag & BT_ROOT) {
- if (lmxaddr == 0)
- break;
- } else if (addressPXD(&p->header.self) == lmxaddr)
- break;
-
- /*
- * descend down to leftmost child page
- */
- if (p->header.flag & BT_LEAF) {
- DT_PUTPAGE(mp);
- return -ESTALE;
- }
-
- /* get the leftmost entry */
- stbl = DT_GETSTBL(p);
- pxd = (pxd_t *) & p->slot[stbl[0]];
-
- /* get the child page block address */
- bn = addressPXD(pxd);
- psize = lengthPXD(pxd) << JFS_SBI(ip->i_sb)->l2bsize;
- /* unpin the parent page */
- DT_PUTPAGE(mp);
- }
-
- /*
- * search each page at the current levevl
- */
- loop:
- stbl = DT_GETSTBL(p);
- for (i = 0; i < p->header.nextindex; i++) {
- pxd = (pxd_t *) & p->slot[stbl[i]];
-
- /* found the specified router entry */
- if (addressPXD(pxd) == addressPXD(kpxd) &&
- lengthPXD(pxd) == lengthPXD(kpxd)) {
- btsp = btstack->top;
- btsp->bn = bn;
- btsp->index = i;
- btsp->mp = mp;
-
- return 0;
- }
- }
-
- /* get the right sibling page if any */
- if (p->header.next)
- bn = le64_to_cpu(p->header.next);
- else {
- DT_PUTPAGE(mp);
- return -ESTALE;
- }
-
- /* unpin current page */
- DT_PUTPAGE(mp);
-
- /* get the right sibling page */
- DT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
- if (rc)
- return rc;
-
- goto loop;
-}
-#endif /* _NOTYET */
-
/*
* dtRelink()
*
projects / people / ms / linux.git / blobdiff