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    Subject[PATCH 08/16] fuse: Flush files on wb close -v2
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    From: Pavel Emelyanov <xemul@openvz.org>

    Any write request requires a file handle to report to the userspace. Thus
    when we close a file (and free the fuse_file with this info) we have to
    flush all the outstanding dirty pages.

    filemap_write_and_wait() is enough because every page under fuse writeback
    is accounted in ff->count. This delays actual close until all fuse wb is
    completed.

    In case of "write cache" turned off, the flush is ensured by fuse_vma_close().

    Changed in v2:
    - updated patch to be applied smoothly on top of
    "Trust kernel i_mtime only -v2".

    Signed-off-by: Maxim Patlasov <MPatlasov@parallels.com>
    ---
    fs/fuse/file.c | 6 ++++++
    1 files changed, 6 insertions(+), 0 deletions(-)

    diff --git a/fs/fuse/file.c b/fs/fuse/file.c
    index 09a9eeb..3778de1 100644
    --- a/fs/fuse/file.c
    +++ b/fs/fuse/file.c
    @@ -291,6 +291,12 @@ static int fuse_open(struct inode *inode, struct file *file)

    static int fuse_release(struct inode *inode, struct file *file)
    {
    + struct fuse_conn *fc = get_fuse_conn(inode);
    +
    + /* see fuse_vma_close() for !writeback_cache case */
    + if (fc->writeback_cache)
    + filemap_write_and_wait(file->f_mapping);
    +
    if (test_bit(FUSE_I_MTIME_DIRTY, &get_fuse_inode(inode)->state))
    fuse_flush_mtime(file, true);



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