From f3b1ed0fc219d9c3a7caac14694b18bcc6c5c025 Mon Sep 17 00:00:00 2001
From: drh <drh@noemail.net>
Date: Wed, 2 Dec 2015 13:11:03 +0000
Subject: [PATCH] Minor simplifications to the unix VFS.

FossilOrigin-Name: 2f13c16b45685ec6850cbd9da79e8198bad6a491
---
 manifest      | 12 ++++++------
 manifest.uuid |  2 +-
 src/os_unix.c | 12 ++++--------
 3 files changed, 11 insertions(+), 15 deletions(-)

diff --git a/manifest b/manifest
index 20fe8059ef..23275e1740 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Change\sthe\sSQLITE_NO_SYNC\scompile-time\soption\sto\scall\sfstat()\sin\splace\sof\nfsync()\srather\sthan\sbeing\sa\stotal\sno-op.
-D 2015-12-02T02:33:36.549
+C Minor\ssimplifications\sto\sthe\sunix\sVFS.
+D 2015-12-02T13:11:03.174
 F Makefile.in 23d9a63484a383fc64951b25ef44067930f98dc6
 F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
 F Makefile.msc e8fdca1cb89a1b58b5f4d3a130ea9a3d28cb314d
@@ -323,7 +323,7 @@ F src/os.c 8fd25588eeba74068d41102d26810e216999b6c8
 F src/os.h 3e57a24e2794a94d3cf2342c6d9a884888cd96bf
 F src/os_common.h abdb9a191a367793268fe553d25bab894e986a0e
 F src/os_setup.h c9d4553b5aaa6f73391448b265b89bed0b890faa
-F src/os_unix.c badd3d7b007daa74df6a12c1e5a89a8504ef3594
+F src/os_unix.c 2b65298be9db161beb0e3ffadc9be0080d51c320
 F src/os_win.c 386fba30419e8458b13209781c2af5590eab2811
 F src/os_win.h eb7a47aa17b26b77eb97e4823f20a00b8bda12ca
 F src/pager.c f92aacd5216d8815136c9e0190041783c602641a
@@ -1408,7 +1408,7 @@ F tool/vdbe_profile.tcl 246d0da094856d72d2c12efec03250d71639d19f
 F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
 F tool/warnings.sh 48bd54594752d5be3337f12c72f28d2080cb630b
 F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
-P 3d02711a709a7e708edb0ea8ca5d17b39dd307f6
-R 32c34918a379a944fbe8e3ec0a4b5179
+P f64ea8a052af9790d5e6987cbd5e81d77da6f172
+R 7335e7d7ad4ea5951ac863300cf3bdc9
 U drh
-Z d4a14e46436f968eb1bd48b7a43684a4
+Z 5e48ed834d343e9f2a57065e0ab37833
diff --git a/manifest.uuid b/manifest.uuid
index 88f3adba23..4a79fe8bad 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-f64ea8a052af9790d5e6987cbd5e81d77da6f172
\ No newline at end of file
+2f13c16b45685ec6850cbd9da79e8198bad6a491
\ No newline at end of file
diff --git a/src/os_unix.c b/src/os_unix.c
index 7038bf12df..00602c6b82 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -4123,7 +4123,7 @@ static int unixShmRegionPerMap(void){
 static void unixShmPurge(unixFile *pFd){
   unixShmNode *p = pFd->pInode->pShmNode;
   assert( unixMutexHeld() );
-  if( p && p->nRef==0 ){
+  if( p && ALWAYS(p->nRef==0) ){
     int nShmPerMap = unixShmRegionPerMap();
     int i;
     assert( p->pInode==pFd->pInode );
@@ -4210,7 +4210,7 @@ static int unixOpenSharedMemory(unixFile *pDbFd){
     ** a new *-shm file is created, an attempt will be made to create it
     ** with the same permissions.
     */
-    if( osFstat(pDbFd->h, &sStat) && pInode->bProcessLock==0 ){
+    if( osFstat(pDbFd->h, &sStat) ){
       rc = SQLITE_IOERR_FSTAT;
       goto shm_open_err;
     }
@@ -4766,17 +4766,13 @@ static void unixRemapfile(
 ** recreated as a result of outstanding references) or an SQLite error
 ** code otherwise.
 */
-static int unixMapfile(unixFile *pFd, i64 nByte){
-  i64 nMap = nByte;
-  int rc;
-
+static int unixMapfile(unixFile *pFd, i64 nMap){
   assert( nMap>=0 || pFd->nFetchOut==0 );
   if( pFd->nFetchOut>0 ) return SQLITE_OK;
 
   if( nMap<0 ){
     struct stat statbuf;          /* Low-level file information */
-    rc = osFstat(pFd->h, &statbuf);
-    if( rc!=SQLITE_OK ){
+    if( osFstat(pFd->h, &statbuf) ){
       return SQLITE_IOERR_FSTAT;
     }
     nMap = statbuf.st_size;
-- 
2.47.2