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authorLinus Torvalds <torvalds@linux-foundation.org>2019-05-19 12:15:32 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-05-19 12:15:32 -0700
commitcb6f8739fbf98203d0fb0bc2c2dbbec0ddfe978a (patch)
treebdb69f5b9fb5a3e7b6810319468706bad2b6e1ac /fs
parentff8583d6e4e33fe3856a609095c683d5dbe39120 (diff)
parentde6da1e8bcf0dd2058b950b127491821207679dc (diff)
downloadlwn-cb6f8739fbf98203d0fb0bc2c2dbbec0ddfe978a.tar.gz
lwn-cb6f8739fbf98203d0fb0bc2c2dbbec0ddfe978a.zip
Merge branch 'akpm' (patches from Andrew)
Merge yet more updates from Andrew Morton: "A few final bits: - large changes to vmalloc, yielding large performance benefits - tweak the console-flush-on-panic code - a few fixes" * emailed patches from Andrew Morton <akpm@linux-foundation.org>: panic: add an option to replay all the printk message in buffer initramfs: don't free a non-existent initrd fs/writeback.c: use rcu_barrier() to wait for inflight wb switches going into workqueue when umount mm/compaction.c: correct zone boundary handling when isolating pages from a pageblock mm/vmap: add DEBUG_AUGMENT_LOWEST_MATCH_CHECK macro mm/vmap: add DEBUG_AUGMENT_PROPAGATE_CHECK macro mm/vmalloc.c: keep track of free blocks for vmap allocation
Diffstat (limited to 'fs')
-rw-r--r--fs/fs-writeback.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 36855c1f8daf..b16645b417d9 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -523,8 +523,6 @@ static void inode_switch_wbs(struct inode *inode, int new_wb_id)
isw->inode = inode;
- atomic_inc(&isw_nr_in_flight);
-
/*
* In addition to synchronizing among switchers, I_WB_SWITCH tells
* the RCU protected stat update paths to grab the i_page
@@ -532,6 +530,9 @@ static void inode_switch_wbs(struct inode *inode, int new_wb_id)
* Let's continue after I_WB_SWITCH is guaranteed to be visible.
*/
call_rcu(&isw->rcu_head, inode_switch_wbs_rcu_fn);
+
+ atomic_inc(&isw_nr_in_flight);
+
goto out_unlock;
out_free:
@@ -901,7 +902,11 @@ restart:
void cgroup_writeback_umount(void)
{
if (atomic_read(&isw_nr_in_flight)) {
- synchronize_rcu();
+ /*
+ * Use rcu_barrier() to wait for all pending callbacks to
+ * ensure that all in-flight wb switches are in the workqueue.
+ */
+ rcu_barrier();
flush_workqueue(isw_wq);
}
}