• C
    xfs: prevent recursion in xfs_buf_iorequest · 40a9b796
    Christoph Hellwig 提交于
    If the b_iodone handler is run in calling context in xfs_buf_iorequest we
    can run into a recursion where xfs_buf_iodone_callbacks keeps calling back
    into xfs_buf_iorequest because an I/O error happened, which keeps calling
    back into xfs_buf_iorequest.  This chain will usually not take long
    because the filesystem gets shut down because of log I/O errors, but even
    over a short time it can cause stack overflows if run on the same context.
    
    As a short term workaround make sure we always call the iodone handler in
    workqueue context.
    Signed-off-by: NChristoph Hellwig <hch@lst.de>
    Reviewed-by: NDave Chinner <dchinner@redhat.com>
    Signed-off-by: NBen Myers <bpm@sgi.com>
    40a9b796
xfs_buf.c 37.4 KB