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    Subject[PATCH 4.4 18/41] vfs: Return -ENXIO for negative SEEK_HOLE / SEEK_DATA offsets
    Date
    4.4-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Andreas Gruenbacher <agruenba@redhat.com>

    commit fc46820b27a2d9a46f7e90c9ceb4a64a1bc5fab8 upstream.

    In generic_file_llseek_size, return -ENXIO for negative offsets as well
    as offsets beyond EOF. This affects filesystems which don't implement
    SEEK_HOLE / SEEK_DATA internally, possibly because they don't support
    holes.

    Fixes xfstest generic/448.

    Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    fs/read_write.c | 4 ++--
    1 file changed, 2 insertions(+), 2 deletions(-)

    --- a/fs/read_write.c
    +++ b/fs/read_write.c
    @@ -112,7 +112,7 @@ generic_file_llseek_size(struct file *fi
    * In the generic case the entire file is data, so as long as
    * offset isn't at the end of the file then the offset is data.
    */
    - if (offset >= eof)
    + if ((unsigned long long)offset >= eof)
    return -ENXIO;
    break;
    case SEEK_HOLE:
    @@ -120,7 +120,7 @@ generic_file_llseek_size(struct file *fi
    * There is a virtual hole at the end of the file, so as long as
    * offset isn't i_size or larger, return i_size.
    */
    - if (offset >= eof)
    + if ((unsigned long long)offset >= eof)
    return -ENXIO;
    offset = eof;
    break;

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