diff options
| -rw-r--r-- | mm/truncate.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/mm/truncate.c b/mm/truncate.c index 0668cd340a46..6e7f3cfb982d 100644 --- a/mm/truncate.c +++ b/mm/truncate.c @@ -797,6 +797,21 @@ void pagecache_isize_extended(struct inode *inode, loff_t from, loff_t to) */ if (folio_mkclean(folio)) folio_mark_dirty(folio); + + /* + * The post-eof range of the folio must be zeroed before it is exposed + * to the file. Writeback normally does this, but since i_size has been + * increased we handle it here. + */ + if (folio_test_dirty(folio)) { + unsigned int offset, end; + + offset = from - folio_pos(folio); + end = min_t(unsigned int, to - folio_pos(folio), + folio_size(folio)); + folio_zero_segment(folio, offset, end); + } + folio_unlock(folio); folio_put(folio); } |