writeback: update dirtied_when for synced inode to prevent livelock

Explicitly update .dirtied_when on synced inodes, so that they are no
longer considered for writeback in the next round.

It can prevent both of the following livelock schemes:

- while true; do echo data >> f; done
- while true; do touch f;        done (in theory)

The exact livelock condition is, during sync(1):

(1) no new inodes are dirtied
(2) an inode being actively dirtied

On (2), the inode will be tagged and synced with .nr_to_write=LONG_MAX.
When finished, it will be redirty_tail()ed because it's still dirty
and (.nr_to_write > 0). redirty_tail() won't update its ->dirtied_when
on condition (1). The sync work will then revisit it on the next
queue_io() and find it eligible again because its old ->dirtied_when
predates the sync work start time.

We'll do more aggressive "keep writeback as long as we wrote something"
logic in wb_writeback(). The "use LONG_MAX .nr_to_write" trick in commit
b9543dac5bbc ("writeback: avoid livelocking WB_SYNC_ALL writeback") will
no longer be enough to stop sync livelock.

Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 5ed2ce9a28d0..fe190a8b0bc8 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -419,6 +419,15 @@ writeback_single_inode(struct inode *inode, struct writeback_control *wbc)
         spin_lock(&inode->i_lock);
         inode->i_state &= ~I_SYNC;
         if (!(inode->i_state & I_FREEING)) {
+                /*
+                 * Sync livelock prevention. Each inode is tagged and synced in
+                 * one shot. If still dirty, it will be redirty_tail()'ed below.
+                 * Update the dirty time to prevent enqueue and sync it again.
+                 */
+                if ((inode->i_state & I_DIRTY) &&
+                    (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages))
+                        inode->dirtied_when = jiffies;
+
                 if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) {
                         /*
                          * We didn't write back all the pages.  nfs_writepages()