• Fred Isaman's avatar
    pnfsblock: encode_layoutcommit · 90ace12a
    Fred Isaman authored
    In blocklayout driver. There are two things happening
    while layoutcommit/cleanup.
    1. the modified extents are encoded.
    2. On cleanup the extents are put back on the layout rw
       extents list, for reads.
    
    In the new system where actual xdr encoding is done in
    encode_layoutcommit() directly into xdr buffer, these are
    the new commit stages:
    
    1. On setup_layoutcommit, the range is adjusted as before
       and a structure is allocated for communication with
       bl_encode_layoutcommit && bl_cleanup_layoutcommit
       (Generic layer provides a void-star to hang it on)
    
    2. bl_encode_layoutcommit is called to do the actual
       encoding directly into xdr. The commit-extent-list is not
       freed and is stored on above structure.
       FIXME: The code is not yet converted to the new XDR cleanup
    
    3. On cleanup the commit-extent-list is put back by a call
       to set_to_rw() as before, but with no need for XDR decoding
       of the list as before. And the commit-extent-list is freed.
       Finally allocated structure is freed.
    
    [rm inode and pnfs_layout_hdr args from cleanup_layoutcommit()]
    [pnfsblock: get rid of deprecated xdr macros]
    Signed-off-by: default avatarJim Rees <rees@umich.edu>
    Signed-off-by: default avatarPeng Tao <peng_tao@emc.com>
    Signed-off-by: default avatarFred Isaman <iisaman@citi.umich.edu>
    [blocklayout: encode_layoutcommit implementation]
    Signed-off-by: default avatarBoaz Harrosh <bharrosh@panasas.com>
    [pnfsblock: fix bug setting up layoutcommit.]
    Signed-off-by: default avatarTao Guo <guotao@nrchpc.ac.cn>
    [pnfsblock: prevent commit list corruption]
    [pnfsblock: fix layoutcommit with an empty opaque]
    Signed-off-by: default avatarFred Isaman <iisaman@citi.umich.edu>
    Signed-off-by: default avatarBenny Halevy <bhalevy@panasas.com>
    Signed-off-by: default avatarBenny Halevy <bhalevy@tonian.com>
    Signed-off-by: default avatarJim Rees <rees@umich.edu>
    Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
    90ace12a
blocklayout.h 6.9 KB