Update. cvs/libc-ud-970827

1997-08-10 19:17  Philip Blundell  <Philip.Blundell@pobox.com>

	* nss/nss_db/db-XXX.c: Include <db_185.h> not <db.h>.  Somebody
	should update this to use the new db API.
	* nss/nss_db/db-netgrp.c: Likewise.
	* nss/nss_db/db-alias.c: Likewise.
	* db2/Makefile: Makefile for db-2.x in glibc.

1997-08-27 21:20  Ulrich Drepper  <drepper@cygnus.com>

	* csu/Makefile (before-compile): New goal.  Make sure abi-tag.h
	is generated.
	[$(elf)=yes] (asm-CPPFLAGS): Make sure abi-tag.h file can be found.

	* Makeconfig [$(build-omitfp)=yes] (CFLAGS-.o): Add
	-D__USE_STRING_INLINES.
	* string/string.f: Move strnlen optimization after inclusion of
	<bits/string.h>.  Include <bits/string.h> only if __USE_STRING_INLINES
	is defined.
	* sysdeps/generic/memcpy.c: Undef memcpy to allow macro of this name
	in <bits/string.h>.
	* sysdeps/generic/memset.c: Likewise.
	* sysdeps/i386/string.h: i386 optimized string functions.
	* sysdeps/i386/i486string.h: i486+ optimized string functions.

	* Makefile (subdirs): Change db to db2.
	* shlib-versions: Bump libdb verion number to 3.
	* include/db.h: Include from db2 directory.
	* include/db_185.h: New file.
	* sysdeps/i386/Makefile [$(subdirs)=db2] (CPPFLAGS): Add macros
	to provide spinlock information for db2.
	* sysdeps/m68k/m68020/Makefile: New file.  Likewise.
	* sysdeps/sparc/Makefile: New file.  Likewise.
	* sysdeps/unix/sysv/linux/Makefile [$(subdirs)=db2] (CPPFLAGS):
	Add -DHAVE_LLSEEK.
	* db2/config.h: Hand-edited config file for db2 in glibc.
	* db2/compat.h: New file from db-2.3.4.
	* db2/db.h: Likewise.
	* db2/db_185.h: Likewise.
	* db2/db_int.h: Likewise.
	* db2/makedb.c: Likewise.
	* db2/btree/bt_close.c: Likewise.
	* db2/btree/bt_compare.c: Likewise.
	* db2/btree/bt_conv.c: Likewise.
	* db2/btree/bt_cursor.c: Likewise.
	* db2/btree/bt_delete.c: Likewise.
	* db2/btree/bt_open.c: Likewise.
	* db2/btree/bt_page.c: Likewise.
	* db2/btree/bt_put.c: Likewise.
	* db2/btree/bt_rec.c: Likewise.
	* db2/btree/bt_recno.c: Likewise.
	* db2/btree/btree_auto.c: Likewise.
	* db2/btree/bt_rsearch.c: Likewise.
	* db2/btree/bt_search.c: Likewise.
	* db2/btree/bt_split.c: Likewise.
	* db2/btree/bt_stat.c: Likewise.
	* db2/btree/btree.src: Likewise.
	* db2/common/db_appinit.c: Likewise.
	* db2/common/db_err.c: Likewise.
	* db2/common/db_byteorder.c: Likewise.
	* db2/common/db_apprec.c: Likewise.
	* db2/common/db_salloc.c: Likewise.
	* db2/common/db_log2.c: Likewise.
	* db2/common/db_region.c: Likewise.
	* db2/common/db_shash.c: Likewise.
	* db2/db/db.c: Likewise.
	* db2/db/db.src: Likewise.
	* db2/db/db_conv.c: Likewise.
	* db2/db/db_dispatch.c: Likewise.
	* db2/db/db_dup.c: Likewise.
	* db2/db/db_overflow.c: Likewise.
	* db2/db/db_pr.c: Likewise.
	* db2/db/db_rec.c: Likewise.
	* db2/db/db_ret.c: Likewise.
	* db2/db/db_thread.c: Likewise.
	* db2/db/db_auto.c: Likewise.
	* db2/db185/db185.c: Likewise.
	* db2/db185/db185_int.h: Likewise.
	* db2/dbm/dbm.c: Likewise.
	* db2/hash/hash.c: Likewise.
	* db2/hash/hash.src: Likewise.
	* db2/hash/hash_page.c: Likewise.
	* db2/hash/hash_conv.c: Likewise.
	* db2/hash/hash_debug.c: Likewise.
	* db2/hash/hash_stat.c: Likewise.
	* db2/hash/hash_rec.c: Likewise.
	* db2/hash/hash_dup.c: Likewise.
	* db2/hash/hash_func.c: Likewise.
	* db2/hash/hash_auto.c: Likewise.
	* db2/include/mp.h: Likewise.
	* db2/include/btree.h: Likewise.
	* db2/include/db.h.src: Likewise.
	* db2/include/db_int.h.src: Likewise.
	* db2/include/db_shash.h: Likewise.
	* db2/include/db_swap.h: Likewise.
	* db2/include/db_185.h.src: Likewise.
	* db2/include/txn.h: Likewise.
	* db2/include/db_am.h: Likewise.
	* db2/include/shqueue.h: Likewise.
	* db2/include/hash.h: Likewise.
	* db2/include/db_dispatch.h: Likewise.
	* db2/include/lock.h: Likewise.
	* db2/include/db_page.h: Likewise.
	* db2/include/log.h: Likewise.
	* db2/include/db_auto.h: Likewise.
	* db2/include/btree_auto.h: Likewise.
	* db2/include/hash_auto.h: Likewise.
	* db2/include/log_auto.h: Likewise.
	* db2/include/txn_auto.h: Likewise.
	* db2/include/db_ext.h: Likewise.
	* db2/include/btree_ext.h: Likewise.
	* db2/include/clib_ext.h: Likewise.
	* db2/include/common_ext.h: Likewise.
	* db2/include/hash_ext.h: Likewise.
	* db2/include/lock_ext.h: Likewise.
	* db2/include/log_ext.h: Likewise.
	* db2/include/mp_ext.h: Likewise.
	* db2/include/mutex_ext.h: Likewise.
	* db2/include/os_ext.h: Likewise.
	* db2/include/txn_ext.h: Likewise.
	* db2/include/cxx_int.h: Likewise.
	* db2/include/db_cxx.h: Likewise.
	* db2/include/queue.h: Likewise.
	* db2/lock/lock.c: Likewise.
	* db2/lock/lock_conflict.c: Likewise.
	* db2/lock/lock_util.c: Likewise.
	* db2/lock/lock_deadlock.c: Likewise.
	* db2/log/log.c: Likewise.
	* db2/log/log_get.c: Likewise.
	* db2/log/log.src: Likewise.
	* db2/log/log_compare.c: Likewise.
	* db2/log/log_put.c: Likewise.
	* db2/log/log_rec.c: Likewise.
	* db2/log/log_archive.c: Likewise.
	* db2/log/log_register.c: Likewise.
	* db2/log/log_auto.c: Likewise.
	* db2/log/log_findckp.c: Likewise.
	* db2/mp/mp_bh.c: Likewise.
	* db2/mp/mp_fget.c: Likewise.
	* db2/mp/mp_fopen.c: Likewise.
	* db2/mp/mp_fput.c: Likewise.
	* db2/mp/mp_fset.c: Likewise.
	* db2/mp/mp_open.c: Likewise.
	* db2/mp/mp_region.c: Likewise.
	* db2/mp/mp_pr.c: Likewise.
	* db2/mp/mp_sync.c: Likewise.
	* db2/mutex/68020.gcc: Likewise.
	* db2/mutex/mutex.c: Likewise.
	* db2/mutex/README: Likewise.
	* db2/mutex/x86.gcc: Likewise.
	* db2/mutex/sparc.gcc: Likewise.
	* db2/mutex/uts4.cc.s: Likewise.
	* db2/mutex/alpha.dec: Likewise.
	* db2/mutex/alpha.gcc: Likewise.
	* db2/mutex/parisc.gcc: Likewise.
	* db2/mutex/parisc.hp: Likewise.
	* db2/os/db_os_abs.c: Likewise.
	* db2/os/db_os_dir.c: Likewise.
	* db2/os/db_os_fid.c: Likewise.
	* db2/os/db_os_lseek.c: Likewise.
	* db2/os/db_os_mmap.c: Likewise.
	* db2/os/db_os_open.c: Likewise.
	* db2/os/db_os_rw.c: Likewise.
	* db2/os/db_os_sleep.c: Likewise.
	* db2/os/db_os_stat.c: Likewise.
	* db2/os/db_os_unlink.c: Likewise.
	* db2/txn/txn.c: Likewise.
	* db2/txn/txn.src: Likewise.
	* db2/txn/txn_rec.c: Likewise.
	* db2/txn/txn_auto.c: Likewise.
	* db2/clib/getlong.c: Likewise.
	* db2/progs/db_archive/db_archive.c: Likewise.
	* db2/progs/db_checkpoint/db_checkpoint.c: Likewise.
	* db2/progs/db_deadlock/db_deadlock.c: Likewise.
	* db2/progs/db_dump/db_dump.c: Likewise.
	* db2/progs/db_dump185/db_dump185.c: Likewise.
	* db2/progs/db_load/db_load.c: Likewise.
	* db2/progs/db_printlog/db_printlog.c: Likewise.
	* db2/progs/db_recover/db_recover.c: Likewise.
	* db2/progs/db_stat/db_stat.c: Likewise.

	* libio/stdio.h [__cplusplus] (__STDIO_INLINE): Define as inline.

	* po/de.po, po/sv.po: Update from 2.0.5 translations.

	* sysdeps/unix/sysv/linux/netinet/tcp.h: Pretty print.

	* sunrpc/rpc/xdr.h (XDR): Don't define argument of x_destroy callback
	as const.
	* sunrpc/xdr_mem.c (xdrmem_destroy): Don't define argument as const.
	* sunrpx/xdr_rec.c (xdrrec_destroy): Likewise.
	* sunrpx/xdr_stdio.c (xdrstdio_destroy): Likewise.

1997-08-27 18:47  Ulrich Drepper  <drepper@cygnus.com>

	* sysdeps/unix/sysv/linux/if_index.c: Include <errno.h>.
	Reported by Benjamin Kosnik <bkoz@cygnus.com>.

1997-08-27 02:27  Roland McGrath  <roland@baalperazim.frob.com>

	* abi-tags: New file.
	* csu/Makefile (distribute): Remove abi-tag.h.
	($(objpfx)abi-tag.h): New target.
	* Makefile (distribute): Add abi-tags.
	* sysdeps/unix/sysv/linux/abi-tag.h: File removed.
	* sysdeps/mach/hurd/abi-tag.h: File removed.
	* sysdeps/stub/abi-tag.h: File removed.

1997-08-25  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* sysdeps/unix/make-syscalls.sh: Change output so that it
	generates compilation rules only for the currently selected object
	suffixes.

1997-08-25  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* sysdeps/m68k/dl-machine.h (RTLD_START): Switch back to previous
	section to avoid confusing the compiler.
	* sysdeps/alpha/dl-machine.h (RTLD_START): Likewise.
	* sysdeps/i386/dl-machine.h (RTLD_START): Likewise.
	* sysdeps/mips/dl-machine.h (RTLD_START): Likewise.
	* sysdeps/mips/mips64/dl-machine.h (RTLD_START): Likewise.
	* sysdeps/sparc/sparc32/dl-machine.h (RTLD_START): Likewise.

	* sysdeps/m68k/dl-machine.h (elf_machine_load_address): Use a GOT
	relocation instead of a constant to avoid text relocation.
	(ELF_MACHINE_BEFORE_RTLD_RELOC): Removed.
	(RTLD_START): Declare global labels as functions and add size
	directive.

1997-08-25 17:01  Ulrich Drepper  <drepper@cygnus.com>

	* sysdeps/i386/bits/select.h: Correct assembler versions to work even
	for descriptors >= 32.

	* stdlib/alloca.h: Don't define alloca to __alloca since if gcc
	is used __alloca is not defined to __builtin_alloca and so might
	not be available.
	Reported by Uwe Ohse <uwe@ohse.de>.

	* sysdeps/unix/sysv/linux/sys/sysmacros.h: Define macros in a special
	way if gcc is not used and so dev_t is an array.
	Reported by Uwe Ohse <uwe@ohse.de>.

1997-08-23  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* manual/libc.texinfo: Reorder chapters to match logical order.

1997-08-25 12:22  Ulrich Drepper  <drepper@cygnus.com>

	* sunrpc/rpc/xdr.h: Change name of parameters in prototypes of
	xdr_reference, xdrmem_create, and xdrstdio_create because of clash
	with g++ internal symbols.
	Patch by Sudish Joseph <sj@eng.mindspring.net>.

	* elf/dl-deps.c: Implement handling of DT_FILTER.

1 files changed, 359 insertions, 0 deletions

diff --git a/db2/mp/mp_fget.c b/db2/mp/mp_fget.c
new file mode 100644
index 0000000000..418802a3b9
--- /dev/null
+++ b/db2/mp/mp_fget.c
@@ -0,0 +1,359 @@
+/*-
+ * See the file LICENSE for redistribution information.
+ *
+ * Copyright (c) 1996, 1997
+ *	Sleepycat Software.  All rights reserved.
+ */
+#include "config.h"
+
+#ifndef lint
+static const char sccsid[] = "@(#)mp_fget.c	10.22 (Sleepycat) 8/19/97";
+#endif /* not lint */
+
+#ifndef NO_SYSTEM_INCLUDES
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#endif
+
+#include "db_int.h"
+#include "shqueue.h"
+#include "db_shash.h"
+#include "mp.h"
+#include "common_ext.h"
+
+int __sleep_on_every_page_get;		/* XXX: thread debugging option. */
+
+/*
+ * memp_fget --
+ *	Get a page from the file.
+ */
+int
+memp_fget(dbmfp, pgnoaddr, flags, addrp)
+	DB_MPOOLFILE *dbmfp;
+	db_pgno_t *pgnoaddr;
+	u_long flags;
+	void *addrp;
+{
+	BH *bhp, *tbhp;
+	DB_MPOOL *dbmp;
+	MPOOL *mp;
+	MPOOLFILE *mfp;
+	db_pgno_t lastpgno;
+	size_t bucket, mf_offset;
+	off_t size;
+	u_long cnt;
+	int b_incr, b_inserted, readonly_alloc, ret;
+	void *addr;
+
+	dbmp = dbmfp->dbmp;
+
+	/*
+	 * Validate arguments.
+	 *
+	 * !!!
+	 * Don't test for DB_MPOOL_CREATE and DB_MPOOL_NEW flags for readonly
+	 * files here, and create non-existent pages in readonly files if the
+	 * flags are set, later.  The reason is that the hash access method
+	 * wants to get empty pages that don't really exist in readonly files.
+	 * The only alternative is for hash to write the last "bucket" all the
+	 * time, which we don't want to do because one of our big goals in life
+	 * is to keep database files small.  It's sleazy as hell, but we catch
+	 * any attempt to actually write the file in memp_fput().
+	 */
+#define	OKFLAGS	(DB_MPOOL_CREATE | DB_MPOOL_LAST | DB_MPOOL_NEW)
+	if (flags != 0) {
+		if ((ret =
+		    __db_fchk(dbmp->dbenv, "memp_fget", flags, OKFLAGS)) != 0)
+			return (ret);
+
+		switch (flags) {
+		case DB_MPOOL_CREATE:
+		case DB_MPOOL_LAST:
+		case DB_MPOOL_NEW:
+		case 0:
+			break;
+		default:
+			return (__db_ferr(dbmp->dbenv, "memp_fget", 1));
+		}
+	}
+
+#ifdef DEBUG
+	/*
+	 * XXX
+	 * We want to switch threads as often as possible.  Sleep every time
+	 * we get a new page to make it more likely.
+	 */
+	if (__sleep_on_every_page_get && (dbmp->dbenv == NULL ||
+	    dbmp->dbenv->db_yield == NULL || dbmp->dbenv->db_yield() != 0))
+		__db_sleep(0, 1);
+#endif
+
+	mp = dbmp->mp;
+	mfp = dbmfp->mfp;
+	mf_offset = OFFSET(dbmp, mfp);
+	addr = NULL;
+	bhp = NULL;
+	b_incr = b_inserted = readonly_alloc = ret = 0;
+
+	LOCKREGION(dbmp);
+
+	/*
+	 * If mmap'ing the file, just return a pointer.  However, if another
+	 * process has opened the file for writing since we mmap'd it, start
+	 * playing the game by their rules, i.e. everything goes through the
+	 * cache.  All pages previously returned should be safe, as long as
+	 * a locking protocol was observed.
+	 *
+	 * XXX
+	 * We don't discard the map because we don't know when all of the
+	 * pages will have been discarded from the process' address space.
+	 * It would be possible to do so by reference counting the open
+	 * pages from the mmap, but it's unclear to me that it's worth it.
+	 */
+	if (dbmfp->addr != NULL && dbmfp->mfp->can_mmap) {
+		lastpgno = dbmfp->len == 0 ?
+		    0 : (dbmfp->len - 1) / mfp->stat.st_pagesize;
+		if (LF_ISSET(DB_MPOOL_LAST))
+			*pgnoaddr = lastpgno;
+		else {
+			/*
+			 * !!!
+			 * Allocate a page that can never really exist.  See
+			 * the comment above about non-existent pages and the
+			 * hash access method.
+			 */
+			if (LF_ISSET(DB_MPOOL_CREATE | DB_MPOOL_NEW))
+				readonly_alloc = 1;
+			else if (*pgnoaddr > lastpgno) {
+				__db_err(dbmp->dbenv,
+				    "%s: page %lu doesn't exist",
+				    dbmfp->path, (u_long)*pgnoaddr);
+				ret = EINVAL;
+				goto err;
+			}
+		}
+		if (!readonly_alloc) {
+			addr = ADDR(dbmfp, *pgnoaddr * mfp->stat.st_pagesize);
+
+			++mp->stat.st_map;
+			++mfp->stat.st_map;
+
+			goto mapret;
+		}
+	}
+
+	/*
+	 * If requesting the last page or a new page, find the last page.  The
+	 * tricky thing is that the user may have created a page already that's
+	 * after any page that exists in the file.
+	 */
+	if (LF_ISSET(DB_MPOOL_LAST | DB_MPOOL_NEW)) {
+		/*
+		 * Temporary files may not yet have been created.
+		 *
+		 * Don't lock -- there are no atomicity issues for stat(2).
+		 */
+		if (dbmfp->fd == -1)
+			size = 0;
+		else if ((ret = __db_stat(dbmp->dbenv,
+		    dbmfp->path, dbmfp->fd, &size, NULL)) != 0)
+			goto err;
+
+		*pgnoaddr = size == 0 ? 0 : (size - 1) / mfp->stat.st_pagesize;
+
+		/*
+		 * Walk the list of BH's, looking for later pages.  Save the
+		 * pointer if a later page is found so that we don't have to
+		 * search the list twice.
+		 *
+		 * If requesting a new page, return the page one after the last
+		 * page -- which we'll have to create.
+		 */
+		for (tbhp = SH_TAILQ_FIRST(&mp->bhq, __bh);
+		    tbhp != NULL; tbhp = SH_TAILQ_NEXT(tbhp, q, __bh))
+			if (tbhp->pgno >= *pgnoaddr &&
+			    tbhp->mf_offset == mf_offset) {
+				bhp = tbhp;
+				*pgnoaddr = bhp->pgno;
+			}
+		if (LF_ISSET(DB_MPOOL_NEW))
+			++*pgnoaddr;
+	}
+
+	/* If we already found the right buffer, return it. */
+	if (LF_ISSET(DB_MPOOL_LAST) && bhp != NULL) {
+		addr = bhp->buf;
+		goto found;
+	}
+
+	/* If we haven't checked the BH list yet, do the search. */
+	if (!LF_ISSET(DB_MPOOL_LAST | DB_MPOOL_NEW)) {
+		++mp->stat.st_hash_searches;
+		bucket = BUCKET(mp, mf_offset, *pgnoaddr);
+		for (cnt = 0,
+		    bhp = SH_TAILQ_FIRST(&dbmp->htab[bucket], __bh);
+		    bhp != NULL; bhp = SH_TAILQ_NEXT(bhp, mq, __bh)) {
+			++cnt;
+			if (bhp->pgno == *pgnoaddr &&
+			    bhp->mf_offset == mf_offset) {
+				addr = bhp->buf;
+				if (cnt > mp->stat.st_hash_longest)
+					mp->stat.st_hash_longest = cnt;
+				mp->stat.st_hash_examined += cnt;
+				goto found;
+			}
+		}
+		if (cnt > mp->stat.st_hash_longest)
+			mp->stat.st_hash_longest = cnt;
+		mp->stat.st_hash_examined += cnt;
+	}
+
+	/*
+	 * Allocate a new buffer header and data space, and mark the contents
+	 * as useless.
+	 */
+	if ((ret = __memp_ralloc(dbmp, sizeof(BH) -
+	    sizeof(u_int8_t) + mfp->stat.st_pagesize, NULL, &bhp)) != 0)
+		goto err;
+	addr = bhp->buf;
+#ifdef DEBUG
+	if ((ALIGNTYPE)addr & (sizeof(size_t) - 1)) {
+		__db_err(dbmp->dbenv,
+		    "Internal error: BH data NOT size_t aligned.");
+		abort();
+	}
+#endif
+	memset(bhp, 0, sizeof(BH));
+	LOCKINIT(dbmp, &bhp->mutex);
+
+	/*
+	 * Prepend the bucket header to the head of the appropriate MPOOL
+	 * bucket hash list.  Append the bucket header to the tail of the
+	 * MPOOL LRU chain.
+	 *
+	 * We have to do this before we read in the page so we can discard
+	 * our region lock without screwing up the world.
+	 */
+	bucket = BUCKET(mp, mf_offset, *pgnoaddr);
+	SH_TAILQ_INSERT_HEAD(&dbmp->htab[bucket], bhp, mq, __bh);
+	SH_TAILQ_INSERT_TAIL(&mp->bhq, bhp, q);
+	b_inserted = 1;
+
+	/* Set the page number, and associated MPOOLFILE. */
+	bhp->mf_offset = mf_offset;
+	bhp->pgno = *pgnoaddr;
+
+	/*
+	 * If we know we created the page, zero it out and continue.
+	 *
+	 * !!!
+	 * Note: DB_MPOOL_NEW deliberately doesn't call the pgin function.
+	 * If DB_MPOOL_CREATE is used, then the application's pgin function
+	 * has to be able to handle pages of 0's -- if it uses DB_MPOOL_NEW,
+	 * it can detect all of its page creates, and not bother.
+	 *
+	 * Otherwise, read the page into memory, optionally creating it if
+	 * DB_MPOOL_CREATE is set.
+	 *
+	 * Increment the reference count for created buffers, but importantly,
+	 * increment the reference count for buffers we're about to read so
+	 * that the buffer can't move.
+	 */
+	++bhp->ref;
+	b_incr = 1;
+
+	if (LF_ISSET(DB_MPOOL_NEW))
+		memset(addr, 0, mfp->stat.st_pagesize);
+	else {
+		/*
+		 * It's possible for the read function to fail, which means
+		 * that we fail as well.
+		 */
+reread:		if ((ret = __memp_pgread(dbmfp,
+		    bhp, LF_ISSET(DB_MPOOL_CREATE | DB_MPOOL_NEW))) != 0)
+			goto err;
+
+		/*
+		 * !!!
+		 * The __memp_pgread call discarded and reacquired the region
+		 * lock.  Because the buffer reference count was incremented
+		 * before the region lock was discarded the buffer didn't move.
+		 */
+		++mp->stat.st_cache_miss;
+		++mfp->stat.st_cache_miss;
+	}
+
+	if (0) {
+found:		/* Increment the reference count. */
+		if (bhp->ref == UINT16_T_MAX) {
+			__db_err(dbmp->dbenv,
+			    "%s: too many references to page %lu",
+			    dbmfp->path, bhp->pgno);
+			ret = EAGAIN;
+			goto err;
+		}
+		++bhp->ref;
+		b_incr = 1;
+
+		/*
+	 	 * Any found buffer might be trouble.
+		 *
+		 * BH_LOCKED --
+		 * I/O in progress, wait for it to finish.  Because the buffer
+		 * reference count was incremented before the region lock was
+		 * discarded we know the buffer didn't move.
+		 */
+		if (F_ISSET(bhp, BH_LOCKED)) {
+			UNLOCKREGION(dbmp);
+			LOCKBUFFER(dbmp, bhp);
+			/* Waiting for I/O to finish... */
+			UNLOCKBUFFER(dbmp, bhp);
+			LOCKREGION(dbmp);
+		}
+
+		/*
+		 * BH_TRASH --
+		 * The buffer is garbage.
+		 */
+		if (F_ISSET(bhp, BH_TRASH))
+			goto reread;
+
+		/*
+		 * BH_CALLPGIN --
+		 * The buffer was written, and the contents need to be
+		 * converted again.
+		 */
+		if (F_ISSET(bhp, BH_CALLPGIN)) {
+			if ((ret = __memp_pg(dbmfp, bhp, 1)) != 0)
+				goto err;
+			F_CLR(bhp, BH_CALLPGIN);
+		}
+
+		++mp->stat.st_cache_hit;
+		++mfp->stat.st_cache_hit;
+	}
+
+mapret:	LOCKHANDLE(dbmp, &dbmfp->mutex);
+	++dbmfp->pinref;
+	UNLOCKHANDLE(dbmp, &dbmfp->mutex);
+
+	if (0) {
+err:		/*
+		 * If no other process is already waiting on a created buffer,
+		 * go ahead and discard it, it's not useful.
+		 */
+		if (b_incr)
+			--bhp->ref;
+		if (b_inserted && bhp->ref == 0)
+			__memp_bhfree(dbmp, mfp, bhp, 1);
+	}
+
+	UNLOCKREGION(dbmp);
+
+	*(void **)addrp = addr;
+	return (ret);
+}