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authorUlrich Drepper <drepper@redhat.com>2000-01-02 06:01:06 +0000
committerUlrich Drepper <drepper@redhat.com>2000-01-02 06:01:06 +0000
commit8d6f1731fcd082e4f744ba9cb4bde4be7c08f1b3 (patch)
tree099a250d7366aef2ab028fdb24f0d692cd784b4a /db2/mp/mp_fopen.c
parent9a6450d578556c11e7c173d2f28362345b8f1258 (diff)
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Update.
* Makeconfig (all-subdirs): Remove db and db2. * db/*: Removed. * db2/*: Removed.
Diffstat (limited to 'db2/mp/mp_fopen.c')
-rw-r--r--db2/mp/mp_fopen.c560
1 files changed, 0 insertions, 560 deletions
diff --git a/db2/mp/mp_fopen.c b/db2/mp/mp_fopen.c
deleted file mode 100644
index dd02662fd8..0000000000
--- a/db2/mp/mp_fopen.c
+++ /dev/null
@@ -1,560 +0,0 @@
-/*-
- * See the file LICENSE for redistribution information.
- *
- * Copyright (c) 1996, 1997, 1998
- * Sleepycat Software. All rights reserved.
- */
-#include "config.h"
-
-#ifndef lint
-static const char sccsid[] = "@(#)mp_fopen.c 10.60 (Sleepycat) 1/1/99";
-#endif /* not lint */
-
-#ifndef NO_SYSTEM_INCLUDES
-#include <sys/types.h>
-
-#include <errno.h>
-#include <string.h>
-#endif
-
-#include "db_int.h"
-#include "shqueue.h"
-#include "db_shash.h"
-#include "mp.h"
-#include "common_ext.h"
-
-static int __memp_mf_close __P((DB_MPOOL *, DB_MPOOLFILE *));
-static int __memp_mf_open __P((DB_MPOOL *,
- const char *, size_t, db_pgno_t, DB_MPOOL_FINFO *, MPOOLFILE **));
-
-/*
- * memp_fopen --
- * Open a backing file for the memory pool.
- */
-int
-memp_fopen(dbmp, path, flags, mode, pagesize, finfop, retp)
- DB_MPOOL *dbmp;
- const char *path;
- u_int32_t flags;
- int mode;
- size_t pagesize;
- DB_MPOOL_FINFO *finfop;
- DB_MPOOLFILE **retp;
-{
- int ret;
-
- MP_PANIC_CHECK(dbmp);
-
- /* Validate arguments. */
- if ((ret = __db_fchk(dbmp->dbenv,
- "memp_fopen", flags, DB_CREATE | DB_NOMMAP | DB_RDONLY)) != 0)
- return (ret);
-
- /* Require a non-zero pagesize. */
- if (pagesize == 0) {
- __db_err(dbmp->dbenv, "memp_fopen: pagesize not specified");
- return (EINVAL);
- }
- if (finfop != NULL && finfop->clear_len > pagesize)
- return (EINVAL);
-
- return (__memp_fopen(dbmp,
- NULL, path, flags, mode, pagesize, 1, finfop, retp));
-}
-
-/*
- * __memp_fopen --
- * Open a backing file for the memory pool; internal version.
- *
- * PUBLIC: int __memp_fopen __P((DB_MPOOL *, MPOOLFILE *, const char *,
- * PUBLIC: u_int32_t, int, size_t, int, DB_MPOOL_FINFO *, DB_MPOOLFILE **));
- */
-int
-__memp_fopen(dbmp, mfp, path, flags, mode, pagesize, needlock, finfop, retp)
- DB_MPOOL *dbmp;
- MPOOLFILE *mfp;
- const char *path;
- u_int32_t flags;
- int mode, needlock;
- size_t pagesize;
- DB_MPOOL_FINFO *finfop;
- DB_MPOOLFILE **retp;
-{
- DB_ENV *dbenv;
- DB_MPOOLFILE *dbmfp;
- DB_MPOOL_FINFO finfo;
- db_pgno_t last_pgno;
- size_t maxmap;
- u_int32_t mbytes, bytes;
- int ret;
- u_int8_t idbuf[DB_FILE_ID_LEN];
- char *rpath;
-
- dbenv = dbmp->dbenv;
- ret = 0;
- rpath = NULL;
-
- /*
- * If mfp is provided, we take the DB_MPOOL_FINFO information from
- * the mfp. We don't bother initializing everything, because some
- * of them are expensive to acquire. If no mfp is provided and the
- * finfop argument is NULL, we default the values.
- */
- if (finfop == NULL) {
- memset(&finfo, 0, sizeof(finfo));
- if (mfp != NULL) {
- finfo.ftype = mfp->ftype;
- finfo.pgcookie = NULL;
- finfo.fileid = NULL;
- finfo.lsn_offset = mfp->lsn_off;
- finfo.clear_len = mfp->clear_len;
- } else {
- finfo.ftype = 0;
- finfo.pgcookie = NULL;
- finfo.fileid = NULL;
- finfo.lsn_offset = -1;
- finfo.clear_len = 0;
- }
- finfop = &finfo;
- }
-
- /* Allocate and initialize the per-process structure. */
- if ((ret = __os_calloc(1, sizeof(DB_MPOOLFILE), &dbmfp)) != 0)
- return (ret);
- dbmfp->dbmp = dbmp;
- dbmfp->fd = -1;
- dbmfp->ref = 1;
- if (LF_ISSET(DB_RDONLY))
- F_SET(dbmfp, MP_READONLY);
-
- if (path == NULL) {
- if (LF_ISSET(DB_RDONLY)) {
- __db_err(dbenv,
- "memp_fopen: temporary files can't be readonly");
- ret = EINVAL;
- goto err;
- }
- last_pgno = 0;
- } else {
- /* Get the real name for this file and open it. */
- if ((ret = __db_appname(dbenv,
- DB_APP_DATA, NULL, path, 0, NULL, &rpath)) != 0)
- goto err;
- if ((ret = __db_open(rpath,
- LF_ISSET(DB_CREATE | DB_RDONLY),
- DB_CREATE | DB_RDONLY, mode, &dbmfp->fd)) != 0) {
- __db_err(dbenv, "%s: %s", rpath, strerror(ret));
- goto err;
- }
-
- /*
- * Don't permit files that aren't a multiple of the pagesize,
- * and find the number of the last page in the file, all the
- * time being careful not to overflow 32 bits.
- *
- * !!!
- * We can't use off_t's here, or in any code in the mainline
- * library for that matter. (We have to use them in the os
- * stubs, of course, as there are system calls that take them
- * as arguments.) The reason is that some customers build in
- * environments where an off_t is 32-bits, but still run where
- * offsets are 64-bits, and they pay us a lot of money.
- */
- if ((ret = __os_ioinfo(rpath,
- dbmfp->fd, &mbytes, &bytes, NULL)) != 0) {
- __db_err(dbenv, "%s: %s", rpath, strerror(ret));
- goto err;
- }
-
- /* Page sizes have to be a power-of-two, ignore mbytes. */
- if (bytes % pagesize != 0) {
- __db_err(dbenv,
- "%s: file size not a multiple of the pagesize",
- rpath);
- ret = EINVAL;
- goto err;
- }
-
- last_pgno = mbytes * (MEGABYTE / pagesize);
- last_pgno += bytes / pagesize;
-
- /* Correction: page numbers are zero-based, not 1-based. */
- if (last_pgno != 0)
- --last_pgno;
-
- /*
- * Get the file id if we weren't given one. Generated file id's
- * don't use timestamps, otherwise there'd be no chance of any
- * other process joining the party.
- */
- if (finfop->fileid == NULL) {
- if ((ret = __os_fileid(dbenv, rpath, 0, idbuf)) != 0)
- goto err;
- finfop->fileid = idbuf;
- }
- }
-
- /*
- * If we weren't provided an underlying shared object to join with,
- * find/allocate the shared file objects. Also allocate space for
- * for the per-process thread lock.
- */
- if (needlock)
- LOCKREGION(dbmp);
-
- if (mfp == NULL)
- ret = __memp_mf_open(dbmp,
- path, pagesize, last_pgno, finfop, &mfp);
- else {
- ++mfp->ref;
- ret = 0;
- }
- if (ret == 0 &&
- F_ISSET(dbmp, MP_LOCKHANDLE) && (ret =
- __memp_alloc(dbmp, sizeof(db_mutex_t), NULL, &dbmfp->mutexp)) == 0)
- LOCKINIT(dbmp, dbmfp->mutexp);
-
- if (needlock)
- UNLOCKREGION(dbmp);
- if (ret != 0)
- goto err;
-
- dbmfp->mfp = mfp;
-
- /*
- * If a file:
- * + is read-only
- * + isn't temporary
- * + doesn't require any pgin/pgout support
- * + the DB_NOMMAP flag wasn't set
- * + and is less than mp_mmapsize bytes in size
- *
- * we can mmap it instead of reading/writing buffers. Don't do error
- * checking based on the mmap call failure. We want to do normal I/O
- * on the file if the reason we failed was because the file was on an
- * NFS mounted partition, and we can fail in buffer I/O just as easily
- * as here.
- *
- * XXX
- * We'd like to test to see if the file is too big to mmap. Since we
- * don't know what size or type off_t's or size_t's are, or the largest
- * unsigned integral type is, or what random insanity the local C
- * compiler will perpetrate, doing the comparison in a portable way is
- * flatly impossible. Hope that mmap fails if the file is too large.
- */
-#define DB_MAXMMAPSIZE (10 * 1024 * 1024) /* 10 Mb. */
- if (F_ISSET(mfp, MP_CAN_MMAP)) {
- if (!F_ISSET(dbmfp, MP_READONLY))
- F_CLR(mfp, MP_CAN_MMAP);
- if (path == NULL)
- F_CLR(mfp, MP_CAN_MMAP);
- if (finfop->ftype != 0)
- F_CLR(mfp, MP_CAN_MMAP);
- if (LF_ISSET(DB_NOMMAP))
- F_CLR(mfp, MP_CAN_MMAP);
- maxmap = dbenv == NULL || dbenv->mp_mmapsize == 0 ?
- DB_MAXMMAPSIZE : dbenv->mp_mmapsize;
- if (mbytes > maxmap / MEGABYTE ||
- (mbytes == maxmap / MEGABYTE && bytes >= maxmap % MEGABYTE))
- F_CLR(mfp, MP_CAN_MMAP);
- }
- dbmfp->addr = NULL;
- if (F_ISSET(mfp, MP_CAN_MMAP)) {
- dbmfp->len = (size_t)mbytes * MEGABYTE + bytes;
- if (__db_mapfile(rpath,
- dbmfp->fd, dbmfp->len, 1, &dbmfp->addr) != 0) {
- dbmfp->addr = NULL;
- F_CLR(mfp, MP_CAN_MMAP);
- }
- }
- if (rpath != NULL)
- __os_freestr(rpath);
-
- LOCKHANDLE(dbmp, dbmp->mutexp);
- TAILQ_INSERT_TAIL(&dbmp->dbmfq, dbmfp, q);
- UNLOCKHANDLE(dbmp, dbmp->mutexp);
-
- *retp = dbmfp;
- return (0);
-
-err: /*
- * Note that we do not have to free the thread mutex, because we
- * never get to here after we have successfully allocated it.
- */
- if (rpath != NULL)
- __os_freestr(rpath);
- if (dbmfp->fd != -1)
- (void)__os_close(dbmfp->fd);
- if (dbmfp != NULL)
- __os_free(dbmfp, sizeof(DB_MPOOLFILE));
- return (ret);
-}
-
-/*
- * __memp_mf_open --
- * Open an MPOOLFILE.
- */
-static int
-__memp_mf_open(dbmp, path, pagesize, last_pgno, finfop, retp)
- DB_MPOOL *dbmp;
- const char *path;
- size_t pagesize;
- db_pgno_t last_pgno;
- DB_MPOOL_FINFO *finfop;
- MPOOLFILE **retp;
-{
- MPOOLFILE *mfp;
- int ret;
- void *p;
-
-#define ISTEMPORARY (path == NULL)
-
- /*
- * Walk the list of MPOOLFILE's, looking for a matching file.
- * Temporary files can't match previous files.
- */
- if (!ISTEMPORARY)
- for (mfp = SH_TAILQ_FIRST(&dbmp->mp->mpfq, __mpoolfile);
- mfp != NULL; mfp = SH_TAILQ_NEXT(mfp, q, __mpoolfile)) {
- if (F_ISSET(mfp, MP_TEMP))
- continue;
- if (!memcmp(finfop->fileid,
- R_ADDR(dbmp, mfp->fileid_off), DB_FILE_ID_LEN)) {
- if (finfop->clear_len != mfp->clear_len ||
- finfop->ftype != mfp->ftype ||
- pagesize != mfp->stat.st_pagesize) {
- __db_err(dbmp->dbenv,
- "%s: ftype, clear length or pagesize changed",
- path);
- return (EINVAL);
- }
-
- /* Found it: increment the reference count. */
- ++mfp->ref;
- *retp = mfp;
- return (0);
- }
- }
-
- /* Allocate a new MPOOLFILE. */
- if ((ret = __memp_alloc(dbmp, sizeof(MPOOLFILE), NULL, &mfp)) != 0)
- return (ret);
- *retp = mfp;
-
- /* Initialize the structure. */
- memset(mfp, 0, sizeof(MPOOLFILE));
- mfp->ref = 1;
- mfp->ftype = finfop->ftype;
- mfp->lsn_off = finfop->lsn_offset;
- mfp->clear_len = finfop->clear_len;
-
- /*
- * If the user specifies DB_MPOOL_LAST or DB_MPOOL_NEW on a memp_fget,
- * we have to know the last page in the file. Figure it out and save
- * it away.
- */
- mfp->stat.st_pagesize = pagesize;
- mfp->orig_last_pgno = mfp->last_pgno = last_pgno;
-
- if (ISTEMPORARY)
- F_SET(mfp, MP_TEMP);
- else {
- /* Copy the file path into shared memory. */
- if ((ret = __memp_alloc(dbmp,
- strlen(path) + 1, &mfp->path_off, &p)) != 0)
- goto err;
- memcpy(p, path, strlen(path) + 1);
-
- /* Copy the file identification string into shared memory. */
- if ((ret = __memp_alloc(dbmp,
- DB_FILE_ID_LEN, &mfp->fileid_off, &p)) != 0)
- goto err;
- memcpy(p, finfop->fileid, DB_FILE_ID_LEN);
-
- F_SET(mfp, MP_CAN_MMAP);
- }
-
- /* Copy the page cookie into shared memory. */
- if (finfop->pgcookie == NULL || finfop->pgcookie->size == 0) {
- mfp->pgcookie_len = 0;
- mfp->pgcookie_off = 0;
- } else {
- if ((ret = __memp_alloc(dbmp,
- finfop->pgcookie->size, &mfp->pgcookie_off, &p)) != 0)
- goto err;
- memcpy(p, finfop->pgcookie->data, finfop->pgcookie->size);
- mfp->pgcookie_len = finfop->pgcookie->size;
- }
-
- /* Prepend the MPOOLFILE to the list of MPOOLFILE's. */
- SH_TAILQ_INSERT_HEAD(&dbmp->mp->mpfq, mfp, q, __mpoolfile);
-
- if (0) {
-err: if (mfp->path_off != 0)
- __db_shalloc_free(dbmp->addr,
- R_ADDR(dbmp, mfp->path_off));
- if (mfp->fileid_off != 0)
- __db_shalloc_free(dbmp->addr,
- R_ADDR(dbmp, mfp->fileid_off));
- if (mfp != NULL)
- __db_shalloc_free(dbmp->addr, mfp);
- mfp = NULL;
- }
- return (0);
-}
-
-/*
- * memp_fclose --
- * Close a backing file for the memory pool.
- */
-int
-memp_fclose(dbmfp)
- DB_MPOOLFILE *dbmfp;
-{
- DB_MPOOL *dbmp;
- int ret, t_ret;
-
- dbmp = dbmfp->dbmp;
- ret = 0;
-
- MP_PANIC_CHECK(dbmp);
-
- for (;;) {
- LOCKHANDLE(dbmp, dbmp->mutexp);
-
- /*
- * We have to reference count DB_MPOOLFILE structures as other
- * threads may be using them. The problem only happens if the
- * application makes a bad design choice. Here's the path:
- *
- * Thread A opens a database.
- * Thread B uses thread A's DB_MPOOLFILE to write a buffer
- * in order to free up memory in the mpool cache.
- * Thread A closes the database while thread B is using the
- * DB_MPOOLFILE structure.
- *
- * By opening all databases before creating the threads, and
- * closing them after the threads have exited, applications
- * get better performance and avoid the problem path entirely.
- *
- * Regardless, holding the DB_MPOOLFILE to flush a dirty buffer
- * is a short-term lock, even in worst case, since we better be
- * the only thread of control using the DB_MPOOLFILE structure
- * to read pages *into* the cache. Wait until we're the only
- * reference holder and remove the DB_MPOOLFILE structure from
- * the list, so nobody else can even find it.
- */
- if (dbmfp->ref == 1) {
- TAILQ_REMOVE(&dbmp->dbmfq, dbmfp, q);
- break;
- }
- UNLOCKHANDLE(dbmp, dbmp->mutexp);
-
- (void)__os_sleep(1, 0);
- }
- UNLOCKHANDLE(dbmp, dbmp->mutexp);
-
- /* Complain if pinned blocks never returned. */
- if (dbmfp->pinref != 0)
- __db_err(dbmp->dbenv, "%s: close: %lu blocks left pinned",
- __memp_fn(dbmfp), (u_long)dbmfp->pinref);
-
- /* Close the underlying MPOOLFILE. */
- (void)__memp_mf_close(dbmp, dbmfp);
-
- /* Discard any mmap information. */
- if (dbmfp->addr != NULL &&
- (ret = __db_unmapfile(dbmfp->addr, dbmfp->len)) != 0)
- __db_err(dbmp->dbenv,
- "%s: %s", __memp_fn(dbmfp), strerror(ret));
-
- /* Close the file; temporary files may not yet have been created. */
- if (dbmfp->fd != -1 && (t_ret = __os_close(dbmfp->fd)) != 0) {
- __db_err(dbmp->dbenv,
- "%s: %s", __memp_fn(dbmfp), strerror(t_ret));
- if (ret != 0)
- t_ret = ret;
- }
-
- /* Free memory. */
- if (dbmfp->mutexp != NULL) {
- LOCKREGION(dbmp);
- __db_shalloc_free(dbmp->addr, dbmfp->mutexp);
- UNLOCKREGION(dbmp);
- }
-
- /* Discard the DB_MPOOLFILE structure. */
- __os_free(dbmfp, sizeof(DB_MPOOLFILE));
-
- return (ret);
-}
-
-/*
- * __memp_mf_close --
- * Close down an MPOOLFILE.
- */
-static int
-__memp_mf_close(dbmp, dbmfp)
- DB_MPOOL *dbmp;
- DB_MPOOLFILE *dbmfp;
-{
- BH *bhp, *nbhp;
- MPOOL *mp;
- MPOOLFILE *mfp;
- size_t mf_offset;
-
- mp = dbmp->mp;
- mfp = dbmfp->mfp;
-
- LOCKREGION(dbmp);
-
- /* If more than a single reference, simply decrement. */
- if (mfp->ref > 1) {
- --mfp->ref;
- goto ret1;
- }
-
- /*
- * Move any BH's held by the file to the free list. We don't free the
- * memory itself because we may be discarding the memory pool, and it's
- * fairly expensive to reintegrate the buffers back into the region for
- * no purpose.
- */
- mf_offset = R_OFFSET(dbmp, mfp);
- for (bhp = SH_TAILQ_FIRST(&mp->bhq, __bh); bhp != NULL; bhp = nbhp) {
- nbhp = SH_TAILQ_NEXT(bhp, q, __bh);
-
-#ifdef DEBUG_NO_DIRTY
- /* Complain if we find any blocks that were left dirty. */
- if (F_ISSET(bhp, BH_DIRTY))
- __db_err(dbmp->dbenv,
- "%s: close: pgno %lu left dirty; ref %lu",
- __memp_fn(dbmfp),
- (u_long)bhp->pgno, (u_long)bhp->ref);
-#endif
-
- if (bhp->mf_offset == mf_offset) {
- if (F_ISSET(bhp, BH_DIRTY)) {
- ++mp->stat.st_page_clean;
- --mp->stat.st_page_dirty;
- }
- __memp_bhfree(dbmp, mfp, bhp, 0);
- SH_TAILQ_INSERT_HEAD(&mp->bhfq, bhp, q, __bh);
- }
- }
-
- /* Delete from the list of MPOOLFILEs. */
- SH_TAILQ_REMOVE(&mp->mpfq, mfp, q, __mpoolfile);
-
- /* Free the space. */
- if (mfp->path_off != 0)
- __db_shalloc_free(dbmp->addr, R_ADDR(dbmp, mfp->path_off));
- if (mfp->fileid_off != 0)
- __db_shalloc_free(dbmp->addr, R_ADDR(dbmp, mfp->fileid_off));
- if (mfp->pgcookie_off != 0)
- __db_shalloc_free(dbmp->addr, R_ADDR(dbmp, mfp->pgcookie_off));
- __db_shalloc_free(dbmp->addr, mfp);
-
-ret1: UNLOCKREGION(dbmp);
- return (0);
-}