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Add the SQLITE_FCNTL_SIZE_HINT operator to sqlite3_file_control() and use it

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to give the VFS hints about the ultimate size of a database file when the
file is growing.

FossilOrigin-Name: 2b7e3b4a30d6a7c4a8a4b8e7dd2ed728b565c96d
This commit is contained in:
drh
2010-05-19 19:26:05 +00:00
parent 4c1cb6ab05
commit 9ff27ecdb2
5 changed files with 34 additions and 12 deletions
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6
src/os_unix.c
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@@ -3045,6 +3045,12 @@ static int unixFileControl(sqlite3_file *id, int op, void *pArg){
*(int*)pArg = ((unixFile*)id)->lastErrno;
return SQLITE_OK;
}
case SQLITE_FCNTL_SIZE_HINT: {
sqlite3_int64 szFile = *(sqlite3_int64*)pArg;
unixFile *pFile = (unixFile*)id;
ftruncate(pFile->h, szFile);
return SQLITE_OK;
}
#ifndef NDEBUG
/* The pager calls this method to signal that it has done
** a rollback and that the database is therefore unchanged and