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| author | Jens Axboe <jens.axboe@oracle.com> | 2009-09-14 13:12:40 +0200 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2009-09-16 15:18:51 +0200 |
| commit | cfc4ba5365449cb6b5c9f68d755a142f17da1e47 (patch) | |
| tree | 08770de9bb0e658f2e65abd4d10187b3e9f6bb1b /fs/fs-writeback.c | |
| parent | f11fcae8401a3175f528e2f7917362645d570111 (diff) | |
| download | lwn-cfc4ba5365449cb6b5c9f68d755a142f17da1e47.tar.gz lwn-cfc4ba5365449cb6b5c9f68d755a142f17da1e47.zip | |
writeback: use RCU to protect bdi_list
Now that bdi_writeback_all() no longer handles integrity writeback,
it doesn't have to block anymore. This means that we can switch
bdi_list reader side protection to RCU.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'fs/fs-writeback.c')
| -rw-r--r-- | fs/fs-writeback.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c index 14f06b459197..f8cd7a97f5b7 100644 --- a/fs/fs-writeback.c +++ b/fs/fs-writeback.c @@ -868,16 +868,16 @@ static void bdi_writeback_all(struct writeback_control *wbc) WARN_ON(wbc->sync_mode == WB_SYNC_ALL); - spin_lock(&bdi_lock); + rcu_read_lock(); - list_for_each_entry(bdi, &bdi_list, bdi_list) { + list_for_each_entry_rcu(bdi, &bdi_list, bdi_list) { if (!bdi_has_dirty_io(bdi)) continue; bdi_alloc_queue_work(bdi, wbc); } - spin_unlock(&bdi_lock); + rcu_read_unlock(); } /* |