• J
    udf: Avoid IO in udf_clear_inode · 2c948b3f
    Jan Kara 提交于
    It is not very good to do IO in udf_clear_inode. First, VFS does not really
    expect inode to become dirty there and thus we have to write it ourselves,
    second, memory reclaim gets blocked waiting for IO when it does not really
    expect it, third, the IO pattern (e.g. on umount) resulting from writes in
    udf_clear_inode is bad and it slows down writing a lot.
    
    The reason why UDF needed to do IO in udf_clear_inode is that UDF standard
    mandates extent length to exactly match inode size. But when we allocate
    extents to a file or directory, we don't really know what exactly the final
    file size will be and thus temporarily set it to block boundary and later
    truncate it to exact length in udf_clear_inode. Now, this is changed to
    truncate to final file size in udf_release_file for regular files. For
    directories and symlinks, we do the truncation at the moment when learn
    what the final file size will be.
    Signed-off-by: NJan Kara <jack@suse.cz>
    2c948b3f
file.c 5.6 KB