ext4: Don't treat a truncation of a zero-length file as replace-via-truncate



If a non-existent file is opened via O_WRONLY|O_CREAT|O_TRUNC, there's
no need to treat this as a true file truncation, so we shouldn't
activate the replace-via-truncate hueristic.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

parent 9aee2286

fs/ext4/inode.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -4127,7 +4127,8 @@ void ext4_truncate(struct inode *inode)
		if (!ext4_can_truncate(inode))
		return;

		if (inode->i_size == 0 && !test_opt(inode->i_sb, NO_AUTO_DA_ALLOC))
		if (ei->i_disksize && inode->i_size == 0 &&
		!test_opt(inode->i_sb, NO_AUTO_DA_ALLOC))
		ei->i_state \|= EXT4_STATE_DA_ALLOC_CLOSE;

		if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL) {