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Make sure a connection has an exclusive lock on all database files involved in a multi-file transaction before writing the master-journal pointer into any journal files. Fix for [f3e5abed55].

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FossilOrigin-Name: 50c0f2202d21bbf6b593d75fd20f13c0fac23eff
This commit is contained in:
dan
2010-07-30 10:02:24 +00:00
parent 4d9c1b7fc4
commit eb9444a4b3
4 changed files with 33 additions and 12 deletions
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20
src/pager.c
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@@ -5061,6 +5061,26 @@ int sqlite3PagerSync(Pager *pPager){
return rc;
}
/*
** This function may only be called while a write-transaction is active in
** rollback. If the connection is in WAL mode, this call is a no-op.
** Otherwise, if the connection does not already have an EXCLUSIVE lock on
** the database file, an attempt is made to obtain one.
**
** If the EXCLUSIVE lock is already held or the attempt to obtain it is
** successful, or the connection is in WAL mode, SQLITE_OK is returned.
** Otherwise, either SQLITE_BUSY or an SQLITE_IOERR_XXX error code is
** returned.
*/
int sqlite3PagerExclusiveLock(Pager *pPager){
int rc = SQLITE_OK;
assert( pPager->state>=PAGER_RESERVED );
if( 0==pagerUseWal(pPager) ){
rc = pager_wait_on_lock(pPager, PAGER_EXCLUSIVE);
}
return rc;
}
/*
** Sync the database file for the pager pPager. zMaster points to the name
** of a master journal file that should be written into the individual