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Back out the new device capability. The determination of whether or not a

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file has moved is now done strictly using a file-control.

FossilOrigin-Name: 9c59f5af7ac4908583fab85d37241f200c40f02d
This commit is contained in:
drh
2013-12-07 16:45:05 +00:00
parent b959a017b6
commit a9c19f935c
5 changed files with 18 additions and 19 deletions
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14
src/pager.c
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@@ -4803,19 +4803,21 @@ int sqlite3PagerOpen(
** code from sqlite3OsAccess()) if the database has gone missing.
*/
static int databaseIsUnmoved(Pager *pPager){
const int fixedFlags = SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN |
SQLITE_IOCAP_UNMOVABLE_WHEN_OPEN;
int dc;
int bHasMoved = 0;
int rc;
if( pPager->tempFile ) return SQLITE_OK;
if( pPager->dbSize==0 ) return SQLITE_OK;
assert( pPager->zFilename && pPager->zFilename[0] );
dc = sqlite3OsDeviceCharacteristics(pPager->fd);
if( (dc&fixedFlags)==fixedFlags ) return SQLITE_OK;
rc = sqlite3OsFileControl(pPager->fd, SQLITE_FCNTL_HAS_MOVED, &bHasMoved);
if( rc==SQLITE_OK && bHasMoved ) rc = SQLITE_READONLY_DBMOVED;
if( rc==SQLITE_NOTFOUND ){
/* If the HAS_MOVED file-control is unimplemented, assume that the file
** has not been moved. That is the historical behavior of SQLite: prior to
** version 3.8.3, it never checked */
rc = SQLITE_OK;
}else if( rc==SQLITE_OK && bHasMoved ){
rc = SQLITE_READONLY_DBMOVED;
}
return rc;
}