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| author | Joe Thornber <ejt@redhat.com> | 2012-12-22 00:23:31 +0400 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2012-12-22 00:23:31 +0400 |
| commit | b7ca9c9273e5eebd63880dd8a6e4e5c18fc7901d (patch) | |
| tree | 8022d8d5f6f03d80896407562b48c554a8cbfa6f /drivers/devfreq/governor_powersave.c | |
| parent | c1a94672a830e01d58c7c7e8de530c3f136d6ff2 (diff) | |
| download | linux-b7ca9c9273e5eebd63880dd8a6e4e5c18fc7901d.tar.xz | |
dm thin: replace dm_cell_release_singleton with cell_defer_except
Change existing users of the function dm_cell_release_singleton to share
cell_defer_except instead, and then remove the now-unused function.
Everywhere that calls dm_cell_release_singleton, the bio in question
is the holder of the cell.
If there are no non-holder entries in the cell then cell_defer_except
behaves exactly like dm_cell_release_singleton. Conversely, if there
*are* non-holder entries then dm_cell_release_singleton must not be used
because those entries would need to be deferred.
Consequently, it is safe to replace use of dm_cell_release_singleton
with cell_defer_except.
This patch is a pre-requisite for "dm thin: fix race between
simultaneous io and discards to same block".
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/devfreq/governor_powersave.c')
0 files changed, 0 insertions, 0 deletions