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Diffstat (limited to 'db2/common/db_region.c')
-rw-r--r--db2/common/db_region.c77
1 files changed, 47 insertions, 30 deletions
diff --git a/db2/common/db_region.c b/db2/common/db_region.c
index 4fc603a2b0..02d939e3e6 100644
--- a/db2/common/db_region.c
+++ b/db2/common/db_region.c
@@ -43,7 +43,7 @@
#include "config.h"
#ifndef lint
-static const char sccsid[] = "@(#)db_region.c 10.18 (Sleepycat) 11/28/97";
+static const char sccsid[] = "@(#)db_region.c 10.21 (Sleepycat) 1/16/98";
#endif /* not lint */
#ifndef NO_SYSTEM_INCLUDES
@@ -168,6 +168,8 @@ __db_rinit(dbenv, rp, fd, size, lock_region)
{
int ret;
+ COMPQUIET(dbenv, NULL);
+
/*
* Initialize the common information.
*
@@ -190,6 +192,12 @@ __db_rinit(dbenv, rp, fd, size, lock_region)
* been initialized in which case an attempt to get it could lead to
* random behavior. If the version number isn't there (the file size
* is too small) or it's 0, we know that the region is being created.
+ *
+ * We also make sure to check the return of __db_mutex_lock() here,
+ * even though we don't usually check elsewhere. This is the first
+ * lock we attempt to acquire, and if it fails we have to know. (It
+ * can fail -- SunOS, using fcntl(2) for locking, with an in-memory
+ * filesystem specified as the database home.)
*/
__db_mutex_init(&rp->lock, MUTEX_LOCK_OFFSET(rp, &rp->lock));
if (lock_region && (ret = __db_mutex_lock(&rp->lock, fd)) != 0)
@@ -219,7 +227,8 @@ __db_ropen(dbenv, appname, path, file, flags, fdp, retp)
void *retp;
{
RLAYOUT *rp;
- off_t size1, size2;
+ size_t size;
+ u_int32_t mbytes, bytes;
int fd, ret;
char *name;
@@ -251,19 +260,20 @@ __db_ropen(dbenv, appname, path, file, flags, fdp, retp)
* flatly impossible. Hope that mmap fails if the file is too large.
*
*/
- if ((ret = __db_ioinfo(name, fd, &size1, NULL)) != 0) {
+ if ((ret = __db_ioinfo(name, fd, &mbytes, &bytes, NULL)) != 0) {
__db_err(dbenv, "%s: %s", name, strerror(ret));
goto err2;
}
+ size = mbytes * MEGABYTE + bytes;
/* Check to make sure the first block has been written. */
- if ((size_t)size1 < sizeof(RLAYOUT)) {
+ if (size < sizeof(RLAYOUT)) {
ret = EAGAIN;
goto err2;
}
/* Map in whatever is there. */
- if ((ret = __db_rmap(dbenv, fd, size1, &rp)) != 0)
+ if ((ret = __db_rmap(dbenv, fd, size, &rp)) != 0)
goto err2;
/*
@@ -284,11 +294,11 @@ __db_ropen(dbenv, appname, path, file, flags, fdp, retp)
* getting the size of the file and checking the major version. Check
* to make sure we got the entire file.
*/
- if ((ret = __db_ioinfo(name, fd, &size2, NULL)) != 0) {
+ if ((ret = __db_ioinfo(name, fd, &mbytes, &bytes, NULL)) != 0) {
__db_err(dbenv, "%s: %s", name, strerror(ret));
goto err1;
}
- if (size1 != size2) {
+ if (size != mbytes * MEGABYTE + bytes) {
ret = EAGAIN;
goto err1;
}
@@ -490,11 +500,9 @@ __db_rgrow(dbenv, fd, incr)
int fd;
size_t incr;
{
-#ifdef MMAP_INIT_NEEDED
size_t i;
-#endif
ssize_t nw;
- int ret;
+ int mmap_init_needed, ret;
char buf[__DB_VMPAGESIZE];
/* Seek to the end of the region. */
@@ -506,33 +514,42 @@ __db_rgrow(dbenv, fd, incr)
/*
* Historically, some systems required that all of the bytes of the
- * region be written before you could mmap it and access it randomly.
+ * region be written before it could be mmapped and accessed randomly.
+ *
+ * Windows/95 doesn't have that problem, but it leaves file contents
+ * uninitialized. Win/NT apparently initializes them.
*/
#ifdef MMAP_INIT_NEEDED
- /* Extend the region by writing each new page. */
- for (i = 0; i < incr; i += __DB_VMPAGESIZE) {
+ mmap_init_needed = 1;
+#else
+ mmap_init_needed = __os_oldwin();
+#endif
+ if (mmap_init_needed)
+ /* Extend the region by writing each new page. */
+ for (i = 0; i < incr; i += __DB_VMPAGESIZE) {
+ if ((ret = __db_write(fd, buf, sizeof(buf), &nw)) != 0)
+ goto err;
+ if (nw != sizeof(buf))
+ goto eio;
+ }
+ else {
+ /*
+ * Extend the region by writing the last page.
+ *
+ * Round off the increment to the next page boundary.
+ */
+ incr += __DB_VMPAGESIZE - 1;
+ incr -= incr % __DB_VMPAGESIZE;
+
+ /* Write the last page, not the page after the last. */
+ if ((ret =
+ __db_seek(fd, 0, 0, incr - __DB_VMPAGESIZE, SEEK_CUR)) != 0)
+ goto err;
if ((ret = __db_write(fd, buf, sizeof(buf), &nw)) != 0)
goto err;
if (nw != sizeof(buf))
goto eio;
}
-#else
- /*
- * Extend the region by writing the last page.
- *
- * Round off the increment to the next page boundary.
- */
- incr += __DB_VMPAGESIZE - 1;
- incr -= incr % __DB_VMPAGESIZE;
-
- /* Write the last page, not the page after the last. */
- if ((ret = __db_seek(fd, 0, 0, incr - __DB_VMPAGESIZE, SEEK_CUR)) != 0)
- goto err;
- if ((ret = __db_write(fd, buf, sizeof(buf), &nw)) != 0)
- goto err;
- if (nw != sizeof(buf))
- goto eio;
-#endif
return (0);
eio: ret = EIO;