• Ross Zwisler's avatar
    dax: add support for fsync/sync · 9973c98e
    Ross Zwisler authored
    To properly handle fsync/msync in an efficient way DAX needs to track
    dirty pages so it is able to flush them durably to media on demand.
    The tracking of dirty pages is done via the radix tree in struct
    address_space.  This radix tree is already used by the page writeback
    infrastructure for tracking dirty pages associated with an open file,
    and it already has support for exceptional (non struct page*) entries.
    We build upon these features to add exceptional entries to the radix
    tree for DAX dirty PMD or PTE pages at fault time.
    [dan.j.williams@intel.com: fix dax_pmd_dbg build warning]
    Signed-off-by: default avatarRoss Zwisler <ross.zwisler@linux.intel.com>
    Cc: "H. Peter Anvin" <hpa@zytor.com>
    Cc: "J. Bruce Fields" <bfields@fieldses.org>
    Cc: "Theodore Ts'o" <tytso@mit.edu>
    Cc: Alexander Viro <viro@zeniv.linux.org.uk>
    Cc: Andreas Dilger <adilger.kernel@dilger.ca>
    Cc: Dave Chinner <david@fromorbit.com>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: Jan Kara <jack@suse.com>
    Cc: Jeff Layton <jlayton@poochiereds.net>
    Cc: Matthew Wilcox <willy@linux.intel.com>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Matthew Wilcox <matthew.r.wilcox@intel.com>
    Cc: Dave Hansen <dave.hansen@linux.intel.com>
    Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
dax.c 31.2 KB