Unverified Commit 356fa248 authored by Konstantin Komarov's avatar Konstantin Komarov
Browse files

fs/ntfs3: zero-fill folios beyond i_valid in ntfs_read_folio() 



Handle ntfs_read_folio() early when the folio offset is beyond i_valid
by zero-filling the folio and marking it uptodate. This avoids needless
I/O and locking, improves read performance.

Signed-off-by: default avatarKonstantin Komarov <almaz.alexandrovich@paragon-software.com>
parent 576248a3

fs/ntfs3/inode.c

+13 −0
Original line number Diff line number Diff line
@@ -723,6 +723,19 @@ static int ntfs_read_folio(struct file *file, struct folio *folio) 
	struct address_space *mapping = folio->mapping;

	struct inode *inode = mapping->host;

	struct ntfs_inode *ni = ntfs_i(inode);

	loff_t vbo = folio_pos(folio);



	if (unlikely(is_bad_ni(ni))) {

		folio_unlock(folio);

		return -EIO;

	}



	if (ni->i_valid <= vbo) {

		folio_zero_range(folio, 0, folio_size(folio));

		folio_mark_uptodate(folio);

		folio_unlock(folio);

		return 0;

	}



	if (is_resident(ni)) {

		ni_lock(ni);