db/hash/hash_buf.c

107 	BUFHEAD *bp;
115 		bp = prev_bp->ovfl;
116 		if (!bp || (bp->addr != addr))
117 			bp = NULL;
129 		bp = PTROF(segp[segment_ndx]);
134 	if (!bp) {
135 		bp = newbuf(hashp, addr, prev_bp);
136 		if (!bp ||
137 		    __get_page(hashp, bp->page, addr, !prev_bp, is_disk, 0))
141 			    (BUFHEAD *)((intptr_t)bp | is_disk_mask);
143 		BUF_REMOVE(bp);
144 		MRU_INSERT(bp);
146 	return (bp);
158 	BUFHEAD *bp;		/* The buffer we're going to use */
166 	bp = LRU;
169         if (bp == hashp->cpage) {
170                 BUF_REMOVE(bp);
171                 MRU_INSERT(bp);
172                 bp = LRU;
175 	/* If prev_bp is part of bp overflow, create a new buffer. */
176 	if (hashp->nbufs == 0 && prev_bp && bp->ovfl) {
179 		for (ovfl = bp->ovfl; ovfl ; ovfl = ovfl->ovfl) {
191 	if (hashp->nbufs || (bp->flags & BUF_PIN) || bp == hashp->cpage) {
193 		if ((bp = (BUFHEAD *)calloc(1, sizeof(BUFHEAD))) == NULL)
195 		if ((bp->page = (char *)calloc(1, hashp->BSIZE)) == NULL) {
196 			free(bp);
203 		BUF_REMOVE(bp);
208 		if ((bp->addr != 0) || (bp->flags & BUF_BUCKET)) {
213 			shortp = (u_int16_t *)bp->page;
216 			if ((bp->flags & BUF_MOD) && __put_page(hashp, bp->page,
217 			    bp->addr, (int)IS_BUCKET(bp->flags), 0))
227 			if (IS_BUCKET(bp->flags)) {
228 				segment_ndx = bp->addr & (hashp->SGSIZE - 1);
229 				segp = hashp->dir[bp->addr >> hashp->SSHIFT];
235 				    ((bp->flags & BUF_MOD) ||
246 			for (xbp = bp; xbp->ovfl;) {
272 	bp->addr = addr;
275 	    bp->addr, (bp->ovfl ? bp->ovfl->addr : 0), 0);
277 	bp->ovfl = NULL;
286 		    (bp ? bp->addr : 0));
288 		prev_bp->ovfl = bp;
289 		bp->flags = 0;
291 		bp->flags = BUF_BUCKET;
292 	MRU_INSERT(bp);
293 	return (bp);
322 	BUFHEAD *bp;
327 	for (bp = LRU; bp != &hashp->bufhead;) {
329 		if (bp->addr || IS_BUCKET(bp->flags)) {
330 			if (to_disk && (bp->flags & BUF_MOD) &&
331 			    __put_page(hashp, bp->page,
332 			    bp->addr, IS_BUCKET(bp->flags), 0))
337 			if (bp->page) {
338 				(void)memset(bp->page, 0, hashp->BSIZE);
339 				free(bp->page);
341 			BUF_REMOVE(bp);
342 			free(bp);
343 			bp = LRU;
345 			bp = bp->prev;
351 __reclaim_buf(HTAB *hashp, BUFHEAD *bp)
353 	bp->ovfl = NULL;
354 	bp->addr = 0;
355 	bp->flags = 0;
356 	BUF_REMOVE(bp);
357 	LRU_INSERT(bp);