Merge patch series "fixes for uncached IO"

Two fixes for uncached IO.

* patches from https://lore.kernel.org/r/20250218120209.88093-1-jefflexu@linux.alibaba.com:
  mm/truncate: don't skip dirty page in folio_unmap_invalidate()
  mm/filemap: fix miscalculated file range for filemap_fdatawrite_range_kick()

Link: https://lore.kernel.org/r/20250218120209.88093-1-jefflexu@linux.alibaba.com
Signed-off-by: Christian Brauner <brauner@kernel.org>

Author: brauner

include/linux/fs.h

@@ -2975,8 +2975,8 @@ static inline ssize_t generic_write_sync(struct kiocb *iocb, ssize_t count)
 	} else if (iocb->ki_flags & IOCB_DONTCACHE) {
 		struct address_space *mapping = iocb->ki_filp->f_mapping;
 
-		filemap_fdatawrite_range_kick(mapping, iocb->ki_pos,
-					      iocb->ki_pos + count);
+		filemap_fdatawrite_range_kick(mapping, iocb->ki_pos - count,
+					      iocb->ki_pos - 1);
 	}
 
 	return count;

mm/filemap.c

@@ -445,7 +445,7 @@ EXPORT_SYMBOL(filemap_fdatawrite_range);
  * filemap_fdatawrite_range_kick - start writeback on a range
  * @mapping:	target address_space
  * @start:	index to start writeback on
- * @end:	last (non-inclusive) index for writeback
+ * @end:	last (inclusive) index for writeback
  *
  * This is a non-integrity writeback helper, to start writing back folios
  * for the indicated range.

mm/truncate.c

@@ -548,8 +548,6 @@ int folio_unmap_invalidate(struct address_space *mapping, struct folio *folio,
 
 	VM_BUG_ON_FOLIO(!folio_test_locked(folio), folio);
 
-	if (folio_test_dirty(folio))
-		return 0;
 	if (folio_mapped(folio))
 		unmap_mapping_folio(folio);
 	BUG_ON(folio_mapped(folio));