• Christoph Hellwig's avatar
    fs: always maintain i_dio_count · df2d6f26
    Christoph Hellwig authored
    Maintain i_dio_count for all filesystems, not just those using DIO_LOCKING.
    This these filesystems to also protect truncate against direct I/O requests
    by using common code.  Right now the only non-DIO_LOCKING filesystem that
    appears to do so is XFS, which uses an opencoded variant of the i_dio_count
    Behaviour doesn't change for filesystems never calling inode_dio_wait.
    For ext4 behaviour changes when using the dioread_nonlock option, which
    previously was missing any protection between truncate and direct I/O reads.
    For ocfs2 that handcrafted i_dio_count manipulations are replaced with
    the common code now enable.
    Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
    Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
file.c 64.2 KB