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    Subject[PATCH 25/37] Re: [2.6-BK-URL] NTFS: 2.1.21 - Big update with race/bug fixes
    This is patch 25/37 in the series.  It contains the following ChangeSet:

    <aia21@cantab.net> (04/10/12 1.2041.1.3)
    NTFS: Map the page instead of using page_address() before writing to it in
    fs/ntfs/aops.c::ntfs_mft_writepage().

    Signed-off-by: Anton Altaparmakov <aia21@cantab.net>

    Best regards,

    Anton
    --
    Anton Altaparmakov <aia21 at cam.ac.uk> (replace at with @)
    Unix Support, Computing Service, University of Cambridge, CB2 3QH, UK
    Linux NTFS maintainer / IRC: #ntfs on irc.freenode.net
    WWW: http://linux-ntfs.sf.net/, http://www-stu.christs.cam.ac.uk/~aia21/

    ===================================================================

    diff -Nru a/fs/ntfs/ChangeLog b/fs/ntfs/ChangeLog
    --- a/fs/ntfs/ChangeLog 2004-10-19 10:14:36 +01:00
    +++ b/fs/ntfs/ChangeLog 2004-10-19 10:14:36 +01:00
    @@ -80,6 +80,8 @@
    the bug check from fs/ntfs/aops.c::ntfs_write_mst_block(). It is in
    fact required to write outside initialized size when preparing to
    extend the initialized size.
    + - Map the page instead of using page_address() before writing to it in
    + fs/ntfs/aops.c::ntfs_mft_writepage().

    2.1.20 - Fix two stupid bugs introduced in 2.1.18 release.

    diff -Nru a/fs/ntfs/aops.c b/fs/ntfs/aops.c
    --- a/fs/ntfs/aops.c 2004-10-19 10:14:36 +01:00
    +++ b/fs/ntfs/aops.c 2004-10-19 10:14:36 +01:00
    @@ -917,7 +917,7 @@
    if (!nr_bhs)
    goto done;
    /* Apply the mst protection fixups. */
    - kaddr = page_address(page);
    + kaddr = kmap(page);
    for (i = 0; i < nr_bhs; i++) {
    if (!(i % bhs_per_rec)) {
    err = pre_write_mst_fixup((NTFS_RECORD*)(kaddr +
    @@ -974,6 +974,7 @@
    bh_offset(bhs[i])));
    }
    flush_dcache_page(page);
    + kunmap(page);
    if (unlikely(err)) {
    /* I/O error during writing. This is really bad! */
    ntfs_error(vol->sb, "I/O error while writing ntfs record "
    @@ -996,6 +997,7 @@
    post_write_mst_fixup((NTFS_RECORD*)(kaddr +
    bh_offset(bhs[i])));
    }
    + kunmap(page);
    cleanup_out:
    /* Clean the buffers. */
    for (i = 0; i < nr_bhs; i++)
    -
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