diff options
| author | Song Liu <[email protected]> | 2019-09-23 15:37:47 -0700 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2019-09-24 15:54:11 -0700 |
| commit | 31895438e702f48e25b7aa6d88f9c97c795c79c7 (patch) | |
| tree | 6d3bf756856dcab897ef9f8cf6d284079711435a | |
| parent | 585e5a7babd91fd85a5cc97b7324c6c2fc29e1ec (diff) | |
filemap: check compound_head(page)->mapping in pagecache_get_page()
Similar to previous patch, pagecache_get_page() avoids race condition with
truncate by checking page->mapping == mapping. This does not work for
compound pages. This patch let it check compound_head(page)->mapping
instead.
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Song Liu <[email protected]>
Suggested-by: Johannes Weiner <[email protected]>
Acked-by: Johannes Weiner <[email protected]>
Cc: Hillf Danton <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Kirill A. Shutemov <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: William Kucharski <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
| -rw-r--r-- | mm/filemap.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/filemap.c b/mm/filemap.c index fc7818b4537e..0b301103ea80 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -1647,7 +1647,7 @@ repeat: } /* Has the page been truncated? */ - if (unlikely(page->mapping != mapping)) { + if (unlikely(compound_head(page)->mapping != mapping)) { unlock_page(page); put_page(page); goto repeat; |