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author | Joe Thornber <ejt@redhat.com> | 2015-05-15 15:23:35 +0100 |
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committer | Mike Snitzer <snitzer@redhat.com> | 2015-05-29 14:19:06 -0400 |
commit | 3cdf93f9d85979b22b6abfd4ab19350860e4dfac (patch) | |
tree | 4e77c76a3def3bb6aac401047ee7e8566642026a /arch/arm/mach-s3c64xx | |
parent | 451b9e0071b2833744db7f518115bc085bc7b23c (diff) | |
download | linux-next-3cdf93f9d85979b22b6abfd4ab19350860e4dfac.tar.gz |
dm bio prison: add dm_cell_promote_or_release()
Rather than always releasing the prisoners in a cell, the client may
want to promote one of them to be the new holder. There is a race here
though between releasing an empty cell, and other threads adding new
inmates. So this function makes the decision with its lock held.
This function can have two outcomes:
i) An inmate is promoted to be the holder of the cell (return value of 0).
ii) The cell has no inmate for promotion and is released (return value of 1).
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'arch/arm/mach-s3c64xx')
0 files changed, 0 insertions, 0 deletions