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    Subject[2.6-GIT] NTFS: Release 2.1.25.
    Hi Linus, please pull from


    This is the next NTFS update containing more extended write support (and
    in fact pretty much completely rewritten file write support)! This has
    been in -mm for a while and at least one person (other than me that is)
    tested it, found a bug which I fixed, and since then noone has reported
    any bugs with the code. So I think it is definitely ready for a larger
    audience, i.e. the mainline kernel. (-:

    Please apply. Thanks! (Diffstat is at bottom of email.)

    And people: please try it before Linus releases 2.6.15 and report back
    (especially if you find bugs but even a "it works" would be nice to hear
    from a few more people)...

    The new features are:

    Given an existing uncompressed and unencrypted file, you can use:

    - write(2) to write to the file, including beyond the end of the
    existing file, and the file will be extended appropriately. Both
    resident and non-resident files are supported. Support for heavily
    fragmented files still has some limitations but you will just get an
    EOPNOTSUPP error if you hit one. Everything will still be consistent on
    the volume. Sparse files can also be written to and holes will be
    filled in appropriately.

    - truncate(2) and ftruncate(2) to change the size of the file, inlcuding
    using open(2) with O_TRUNC flag. As with write(2) there still are some
    limitations for heavily fragmented files, and as above, everything will
    still be consistent on the volume if you hit an unsupported case. Note,
    that no sparse regions are created yet as this requires directory
    operations to be implemented, too, which they are not yet. This is not as
    bad as it sounds as the regions are allocated but not initialized at the
    time of the truncate call so it is still very fast. Though a subsequent
    write then needs to initialize the space so may be slow...

    What this means is that you can now run your favourite editor on an
    existing file, e.g. "vim /ntfs/somefile.txt" works fine and you can save
    your changes. Also things like running OpenOffice and editing existing MS
    Office documents works. Basically anything that does not need to create
    temporary files in the same directory as the document should work fine

    Still not supported features are creation/deletion of files/directories
    and mmap(2) based writes to sparse regions of files. (The mmap(2)
    support has not been modified since the last release, only the file
    write(2) support was rewritten.)

    Here is the diffstat for those who care...

    b/Documentation/filesystems/ntfs.txt | 42
    b/fs/ntfs/ChangeLog | 117 +
    b/fs/ntfs/Makefile | 4
    b/fs/ntfs/aops.c | 832 ------------
    b/fs/ntfs/attrib.c | 987 +++++++++++++--
    b/fs/ntfs/attrib.h | 10
    b/fs/ntfs/file.c | 2289 ++++++++++++++++++++++++++++++++++-
    b/fs/ntfs/inode.c | 514 +++++++
    b/fs/ntfs/layout.h | 31
    b/fs/ntfs/lcnalloc.c | 60
    b/fs/ntfs/lcnalloc.h | 43
    b/fs/ntfs/malloc.h | 3
    b/fs/ntfs/mft.c | 26
    b/fs/ntfs/super.c | 2
    14 files changed, 3879 insertions(+), 1081 deletions(-)

    I am sending the changesets as actual patches generated using git
    format-patch for non-git users in follow up emails (in reply to this one).

    Best regards,

    Anton Altaparmakov <aia21 at> (replace at with @)
    Unix Support, Computing Service, University of Cambridge, CB2 3QH, UK
    Linux NTFS maintainer / IRC: #ntfs on
    WWW: &
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      Last update: 2005-10-31 15:25    [W:0.022 / U:5.648 seconds]
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