Merge branch 'akpm' (patches from Andrew)

Merge updates from Andrew Morton:

 - A few misc subsystems: kthread, scripts, ntfs, ocfs2, block, and vfs

 - Most the MM patches which precede the patches in Willy's tree: kasan,
   pagecache, gup, swap, shmem, memcg, selftests, pagemap, mremap,
   sparsemem, vmalloc, pagealloc, memory-failure, mlock, hugetlb,
   userfaultfd, vmscan, compaction, mempolicy, oom-kill, migration, thp,
   cma, autonuma, psi, ksm, page-poison, madvise, memory-hotplug, rmap,
   zswap, uaccess, ioremap, highmem, cleanups, kfence, hmm, and damon.

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (227 commits)
  mm/damon/sysfs: remove repeat container_of() in damon_sysfs_kdamond_release()
  Docs/ABI/testing: add DAMON sysfs interface ABI document
  Docs/admin-guide/mm/damon/usage: document DAMON sysfs interface
  selftests/damon: add a test for DAMON sysfs interface
  mm/damon/sysfs: support DAMOS stats
  mm/damon/sysfs: support DAMOS watermarks
  mm/damon/sysfs: support schemes prioritization
  mm/damon/sysfs: support DAMOS quotas
  mm/damon/sysfs: support DAMON-based Operation Schemes
  mm/damon/sysfs: support the physical address space monitoring
  mm/damon/sysfs: link DAMON for virtual address spaces monitoring
  mm/damon: implement a minimal stub for sysfs-based DAMON interface
  mm/damon/core: add number of each enum type values
  mm/damon/core: allow non-exclusive DAMON start/stop
  Docs/damon: update outdated term 'regions update interval'
  Docs/vm/damon/design: update DAMON-Idle Page Tracking interference handling
  Docs/vm/damon: call low level monitoring primitives the operations
  mm/damon: remove unnecessary CONFIG_DAMON option
  mm/damon/paddr,vaddr: remove damon_{p,v}a_{target_valid,set_operations}()
  mm/damon/dbgfs-test: fix is_target_id() change
  ...

1 files changed, 17 insertions, 0 deletions

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 0fc150c1c50b..61b1e04eb497 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -966,6 +966,14 @@ static void fuse_readahead(struct readahead_control *rac)
 		struct fuse_io_args *ia;
 		struct fuse_args_pages *ap;
 
+		if (fc->num_background >= fc->congestion_threshold &&
+		    rac->ra->async_size >= readahead_count(rac))
+			/*
+			 * Congested and only async pages left, so skip the
+			 * rest.
+			 */
+			break;
+
 		nr_pages = readahead_count(rac) - nr_pages;
 		if (nr_pages > max_pages)
 			nr_pages = max_pages;
@@ -1959,6 +1967,7 @@ err:
 
 static int fuse_writepage(struct page *page, struct writeback_control *wbc)
 {
+	struct fuse_conn *fc = get_fuse_conn(page->mapping->host);
 	int err;
 
 	if (fuse_page_is_writeback(page->mapping->host, page->index)) {
@@ -1974,6 +1983,10 @@ static int fuse_writepage(struct page *page, struct writeback_control *wbc)
 		return 0;
 	}
 
+	if (wbc->sync_mode == WB_SYNC_NONE &&
+	    fc->num_background >= fc->congestion_threshold)
+		return AOP_WRITEPAGE_ACTIVATE;
+
 	err = fuse_writepage_locked(page);
 	unlock_page(page);
 
@@ -2227,6 +2240,10 @@ static int fuse_writepages(struct address_space *mapping,
 	if (fuse_is_bad(inode))
 		goto out;
 
+	if (wbc->sync_mode == WB_SYNC_NONE &&
+	    fc->num_background >= fc->congestion_threshold)
+		return 0;
+
 	data.inode = inode;
 	data.wpa = NULL;
 	data.ff = NULL;