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| author | Jens Axboe <axboe@kernel.dk> | 2017-09-28 20:26:59 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2017-10-03 17:38:17 +0300 |
| commit | 595043e5f9ef1d8263bd9fda215cade489227491 (patch) | |
| tree | 0747af01ce6122bbf730a304444c1aed00d8fd7c /fs/fs-writeback.c | |
| parent | 47410d88f665486bf91f02242ab5d5692b8887ac (diff) | |
| download | linux-595043e5f9ef1d8263bd9fda215cade489227491.tar.xz | |
writeback: provide a wakeup_flusher_threads_bdi()
Similar to wakeup_flusher_threads(), except that we only wake
up the flusher threads on the specified backing device.
No functional changes in this patch.
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Tested-by: Chris Mason <clm@fb.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs/fs-writeback.c')
| -rw-r--r-- | fs/fs-writeback.c | 39 |
1 files changed, 29 insertions, 10 deletions
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c index fe555bce886c..9f39829459dc 100644 --- a/fs/fs-writeback.c +++ b/fs/fs-writeback.c @@ -1947,6 +1947,33 @@ void wb_workfn(struct work_struct *work) } /* + * Start writeback of `nr_pages' pages on this bdi. If `nr_pages' is zero, + * write back the whole world. + */ +static void __wakeup_flusher_threads_bdi(struct backing_dev_info *bdi, + long nr_pages, enum wb_reason reason) +{ + struct bdi_writeback *wb; + + if (!bdi_has_dirty_io(bdi)) + return; + + list_for_each_entry_rcu(wb, &bdi->wb_list, bdi_node) + wb_start_writeback(wb, wb_split_bdi_pages(wb, nr_pages), + reason); +} + +void wakeup_flusher_threads_bdi(struct backing_dev_info *bdi, + enum wb_reason reason) +{ + long nr_pages = get_nr_dirty_pages(); + + rcu_read_lock(); + __wakeup_flusher_threads_bdi(bdi, nr_pages, reason); + rcu_read_unlock(); +} + +/* * Wakeup the flusher threads to start writeback of all currently dirty pages */ void wakeup_flusher_threads(enum wb_reason reason) @@ -1963,16 +1990,8 @@ void wakeup_flusher_threads(enum wb_reason reason) nr_pages = get_nr_dirty_pages(); rcu_read_lock(); - list_for_each_entry_rcu(bdi, &bdi_list, bdi_list) { - struct bdi_writeback *wb; - - if (!bdi_has_dirty_io(bdi)) - continue; - - list_for_each_entry_rcu(wb, &bdi->wb_list, bdi_node) - wb_start_writeback(wb, wb_split_bdi_pages(wb, nr_pages), - reason); - } + list_for_each_entry_rcu(bdi, &bdi_list, bdi_list) + __wakeup_flusher_threads_bdi(bdi, nr_pages, reason); rcu_read_unlock(); } |