On Mon, 2019-06-24 at 17:12 -0700, Song Liu wrote: > In previous patch, an application could put part of its text section > in > THP via madvise(). These THPs will be protected from writes when the > application is still running (TXTBSY). However, after the application > exits, the file is available for writes. > > This patch avoids writes to file THP by dropping page cache for the > file > when the file is open for write. A new counter nr_thps is added to > struct > address_space. In do_last(), if the file is open for write and > nr_thps > is non-zero, we drop page cache for the whole file. > > Reported-by: kbuild test robot <lkp@xxxxxxxxx> > Signed-off-by: Song Liu <songliubraving@xxxxxx> Acked-by: Rik van Riel <riel@xxxxxxxxxxx> -- All Rights Reversed.
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