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Add the immutable=TRUE query parameter and SQLITE_IOCAP_IMMUTABLE, either

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of which prevents locking of the database and omits tests for existance
of journal files.

FossilOrigin-Name: 71f152c85d79ebd9ca48bc9c4c71fc4debaf2437
This commit is contained in:
drh
2014-05-01 01:13:08 +00:00
parent fb4c9242a5
commit d1ae96d39e
4 changed files with 41 additions and 32 deletions
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51
src/pager.c
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@@ -4674,30 +4674,37 @@ int sqlite3PagerOpen(
** + The value returned by sqlite3OsSectorSize()
** + The largest page size that can be written atomically.
*/
if( rc==SQLITE_OK && !readOnly ){
setSectorSize(pPager);
assert(SQLITE_DEFAULT_PAGE_SIZE<=SQLITE_MAX_DEFAULT_PAGE_SIZE);
if( szPageDflt<pPager->sectorSize ){
if( pPager->sectorSize>SQLITE_MAX_DEFAULT_PAGE_SIZE ){
szPageDflt = SQLITE_MAX_DEFAULT_PAGE_SIZE;
}else{
szPageDflt = (u32)pPager->sectorSize;
}
}
#ifdef SQLITE_ENABLE_ATOMIC_WRITE
{
if( rc==SQLITE_OK ){
if( !readOnly ){
int iDc = sqlite3OsDeviceCharacteristics(pPager->fd);
int ii;
assert(SQLITE_IOCAP_ATOMIC512==(512>>8));
assert(SQLITE_IOCAP_ATOMIC64K==(65536>>8));
assert(SQLITE_MAX_DEFAULT_PAGE_SIZE<=65536);
for(ii=szPageDflt; ii<=SQLITE_MAX_DEFAULT_PAGE_SIZE; ii=ii*2){
if( iDc&(SQLITE_IOCAP_ATOMIC|(ii>>8)) ){
szPageDflt = ii;
setSectorSize(pPager);
assert(SQLITE_DEFAULT_PAGE_SIZE<=SQLITE_MAX_DEFAULT_PAGE_SIZE);
if( szPageDflt<pPager->sectorSize ){
if( pPager->sectorSize>SQLITE_MAX_DEFAULT_PAGE_SIZE ){
szPageDflt = SQLITE_MAX_DEFAULT_PAGE_SIZE;
}else{
szPageDflt = (u32)pPager->sectorSize;
}
}
#ifdef SQLITE_ENABLE_ATOMIC_WRITE
{
int ii;
assert(SQLITE_IOCAP_ATOMIC512==(512>>8));
assert(SQLITE_IOCAP_ATOMIC64K==(65536>>8));
assert(SQLITE_MAX_DEFAULT_PAGE_SIZE<=65536);
for(ii=szPageDflt; ii<=SQLITE_MAX_DEFAULT_PAGE_SIZE; ii=ii*2){
if( iDc&(SQLITE_IOCAP_ATOMIC|(ii>>8)) ){
szPageDflt = ii;
}
}
}
}
#endif
if( (iDc & SQLITE_IOCAP_IMMUTABLE)!=0
|| sqlite3_uri_boolean(zFilename, "immutable", 0) ){
vfsFlags |= SQLITE_OPEN_READONLY;
goto act_like_temp_file;
}
}
}
}else{
/* If a temporary file is requested, it is not opened immediately.
@@ -4708,6 +4715,7 @@ int sqlite3PagerOpen(
** database is the same as a temp-file that is never written out to
** disk and uses an in-memory rollback journal.
*/
act_like_temp_file:
tempFile = 1;
pPager->eState = PAGER_READER;
pPager->eLock = EXCLUSIVE_LOCK;
@@ -4751,9 +4759,6 @@ int sqlite3PagerOpen(
/* pPager->nPage = 0; */
pPager->mxPgno = SQLITE_MAX_PAGE_COUNT;
/* pPager->state = PAGER_UNLOCK; */
#if 0
assert( pPager->state == (tempFile ? PAGER_EXCLUSIVE : PAGER_UNLOCK) );
#endif
/* pPager->errMask = 0; */
pPager->tempFile = (u8)tempFile;
assert( tempFile==PAGER_LOCKINGMODE_NORMAL