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author | Joe Thornber <ejt@redhat.com> | 2015-05-15 14:23:35 (GMT) |
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committer | Mike Snitzer <snitzer@redhat.com> | 2015-05-29 18:19:06 (GMT) |
commit | 3cdf93f9d85979b22b6abfd4ab19350860e4dfac (patch) | |
tree | 4e77c76a3def3bb6aac401047ee7e8566642026a /drivers/md/dm-cache-target.c | |
parent | 451b9e0071b2833744db7f518115bc085bc7b23c (diff) | |
download | linux-3cdf93f9d85979b22b6abfd4ab19350860e4dfac.tar.xz |
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 'drivers/md/dm-cache-target.c')
0 files changed, 0 insertions, 0 deletions