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Fix the handling of reserve-bytes so that the maximum value of 255 can be used.

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FossilOrigin-Name: 99749d4fd4930ccf15227f67c732266af9e09dd3cabdc0834fb450ef98196441
This commit is contained in:
drh
2020-05-07 01:56:57 +00:00
parent e0a8b712c1
commit e937df81f0
9 changed files with 28 additions and 30 deletions
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20
src/btree.c
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@@ -2856,19 +2856,17 @@ int sqlite3BtreeSetPagerFlags(
*/
int sqlite3BtreeSetPageSize(Btree *p, int pageSize, int nReserve, int iFix){
int rc = SQLITE_OK;
int x;
BtShared *pBt = p->pBt;
assert( nReserve>=-1 && nReserve<=254 );
assert( nReserve>=0 && nReserve<=255 );
sqlite3BtreeEnter(p);
if( nReserve>=0 ){
pBt->nReserveWanted = nReserve + 1;
}
pBt->nReserveWanted = nReserve;
x = pBt->pageSize - pBt->usableSize;
if( nReserve<x ) nReserve = x;
if( pBt->btsFlags & BTS_PAGESIZE_FIXED ){
sqlite3BtreeLeave(p);
return SQLITE_READONLY;
}
if( nReserve<0 ){
nReserve = pBt->pageSize - pBt->usableSize;
}
assert( nReserve>=0 && nReserve<=255 );
if( pageSize>=512 && pageSize<=SQLITE_MAX_PAGE_SIZE &&
((pageSize-1)&pageSize)==0 ){
@@ -2919,12 +2917,12 @@ int sqlite3BtreeGetReserveNoMutex(Btree *p){
** The amount of reserve can only grow - never shrink.
*/
int sqlite3BtreeGetRequestedReserve(Btree *p){
int n;
int n1, n2;
sqlite3BtreeEnter(p);
n = ((int)p->pBt->nReserveWanted) - 1;
if( n<0 ) n = sqlite3BtreeGetReserveNoMutex(p);
n1 = (int)p->pBt->nReserveWanted;
n2 = sqlite3BtreeGetReserveNoMutex(p);
sqlite3BtreeLeave(p);
return n;
return n1>n2 ? n1 : n2;
}