hulk inclusion category: perf bugzilla: https://gitee.com/openeuler/kernel/issues/IACNS4 CVE: NA
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When doing page mkwrite, iomap_folio_mkwrite_iter() dirty the entire folio by folio_mark_dirty() even the map length is shorter than one folio. However, on the filesystem with more than one blocks per folio, we'd better to only set counterpart block's dirty bit according to iomap_length(), so open code folio_mark_dirty() and pass the correct length.
Signed-off-by: Zhang Yi yi.zhang@huawei.com --- fs/iomap/buffered-io.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c index e76b79efc0df..b89ed06c6f86 100644 --- a/fs/iomap/buffered-io.c +++ b/fs/iomap/buffered-io.c @@ -1488,7 +1488,10 @@ static loff_t iomap_folio_mkwrite_iter(struct iomap_iter *iter, block_commit_write(&folio->page, 0, length); } else { WARN_ON_ONCE(!folio_test_uptodate(folio)); - folio_mark_dirty(folio); + + ifs_alloc(iter->inode, folio, 0); + iomap_set_range_dirty(folio, 0, length); + filemap_dirty_folio(iter->inode->i_mapping, folio); }
return length;