INN commit: trunk/storage/buffindexed (buffindexed.c)

[INN Commit]

    Date: Friday, December 29, 2017 @ 16:52:10
  Author: eagle
Revision: 10208

Adjust buffindexed header page size to platform

Previously, if the platform page size was larger than 16KB,
buffindexed would just refuse to work on that platform.  Instead,
increase the header page size to match the platform page size on
those platforms, but still require that the header page size be
a multiple of the platform page size.

Use sysconf(_SC_PAGESIZE) to get the page size instead of
getpagesize(), since it's the POSIX-standard way of doing this.

Modified:
  trunk/storage/buffindexed/buffindexed.c

---------------+
 buffindexed.c |   22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

Modified: buffindexed.c
===================================================================
--- buffindexed.c	2017-12-29 21:04:56 UTC (rev 10207)
+++ buffindexed.c	2017-12-30 00:52:10 UTC (rev 10208)
@@ -66,7 +66,13 @@
 
 #define	OVMAXCYCBUFFNAME	8
 
-#define OV_HDR_PAGESIZE 16384
+/*
+** Default and minimum size of the header.  If the system default page size is
+** larger than this, we'll use the system page size instead.  The page size in
+** use is stored in the global hdr_pagesize variable.
+*/
+#define OV_HDR_MIN_PAGESIZE 16384
+
 #define OV_BEFOREBITF   (1 * OV_BLOCKSIZE)
 #define	OV_BLOCKSIZE	8192
 #define	OV_FUDGE	1024
@@ -252,6 +258,7 @@
 #define	_PATH_OVBUFFCONFIG	"buffindexed.conf"
 
 static long		pagesize = 0;
+static long		hdr_pagesize = OV_HDR_MIN_PAGESIZE;
 static OVBUFF		*ovbufftab = NULL;
 static OVBUFF           *ovbuffnext = NULL;
 static int              GROUPfd;
@@ -363,7 +370,7 @@
   ** external header occupies ... then round up to the next block.
   */
   base = len / (OV_BLOCKSIZE * 8) + OV_BEFOREBITF;
-  tonextblock = OV_HDR_PAGESIZE - (base & (OV_HDR_PAGESIZE - 1));
+  tonextblock = hdr_pagesize - (base & (hdr_pagesize - 1));
   ovbuff->base = base + tonextblock;
   if (S_ISREG(sb.st_mode) && (len != sb.st_size || ovbuff->base > sb.st_size)) {
     if (len != sb.st_size)
@@ -992,14 +999,17 @@
   }
   ovbuffmode = mode;
   if (pagesize == 0) {
-    pagesize = getpagesize();
+    pagesize = sysconf(_SC_PAGESIZE);
     if (pagesize == -1) {
-      syswarn("buffindexed: getpagesize failed");
+      syswarn("buffindexed: sysconf(_SC_PAGESIZE) failed");
       pagesize = 0;
       return false;
     }
-    if ((pagesize > OV_HDR_PAGESIZE) || (OV_HDR_PAGESIZE % pagesize)) {
-      warn("buffindexed: OV_HDR_PAGESIZE (%d) is not a multiple of pagesize (%ld)", OV_HDR_PAGESIZE, pagesize);
+    if (pagesize > OV_HDR_MIN_PAGESIZE)
+      hdr_pagesize = pagesize;
+    if ((hdr_pagesize % pagesize) != 0) {
+      warn("buffindexed: hdr_pagesize (%ld) is not a multiple of pagesize"
+           " (%ld)", hdr_pagesize, pagesize);
       return false;
     }
   }