Merge tag 'fuse-update-6.16' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse

Pull fuse updates from Miklos Szeredi:

 - Remove tmp page copying in writeback path (Joanne).

   This removes ~300 lines and with that a lot of complexity related to
   avoiding reclaim related deadlock. The old mechanism is replaced with
   a mapping flag that tells the MM not to block reclaim waiting for
   writeback to complete. The MM parts have been reviewed/acked by
   respective maintainers.

 - Convert more code to handle large folios (Joanne). This still just
   adds the code to deal with large folios and does not enable them yet.

 - Allow invalidating all cached lookups atomically (Luis Henriques).
   This feature is useful for CernVMFS, which currently does this
   iteratively.

 - Align write prefaulting in fuse with generic one (Dave Hansen)

 - Fix race causing invalid data to be cached when setting attributes on
   different nodes of a distributed fs (Guang Yuan Wu)

 - Update documentation for passthrough (Chen Linxuan)

 - Add fdinfo about the device number associated with an opened
   /dev/fuse instance (Chen Linxuan)

 - Increase readdir buffer size (Miklos). This depends on a patch to VFS
   readdir code that was already merged through Christians tree.

 - Optimize io-uring request expiration (Joanne)

 - Misc cleanups

* tag 'fuse-update-6.16' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse: (25 commits)
  fuse: increase readdir buffer size
  readdir: supply dir_context.count as readdir buffer size hint
  fuse: don't allow signals to interrupt getdents copying
  fuse: support large folios for writeback
  fuse: support large folios for readahead
  fuse: support large folios for queued writes
  fuse: support large folios for stores
  fuse: support large folios for symlinks
  fuse: support large folios for folio reads
  fuse: support large folios for writethrough writes
  fuse: refactor fuse_fill_write_pages()
  fuse: support large folios for retrieves
  fuse: support copying large folios
  fs: fuse: add dev id to /dev/fuse fdinfo
  docs: filesystems: add fuse-passthrough.rst
  MAINTAINERS: update filter of FUSE documentation
  fuse: fix race between concurrent setattrs from multiple nodes
  fuse: remove tmp folio for writebacks and internal rb tree
  mm: skip folio reclaim in legacy memcg contexts for deadlockable mappings
  fuse: optimize over-io-uring request expiration check
  ...

1 files changed, 11 insertions, 0 deletions

diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index d2ced9920992..e63fbfbd5b0f 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -210,6 +210,7 @@ enum mapping_flags {
 	AS_STABLE_WRITES = 7,	/* must wait for writeback before modifying
 				   folio contents */
 	AS_INACCESSIBLE = 8,	/* Do not attempt direct R/W access to the mapping */
+	AS_WRITEBACK_MAY_DEADLOCK_ON_RECLAIM = 9,
 	/* Bits 16-25 are used for FOLIO_ORDER */
 	AS_FOLIO_ORDER_BITS = 5,
 	AS_FOLIO_ORDER_MIN = 16,
@@ -335,6 +336,16 @@ static inline bool mapping_inaccessible(struct address_space *mapping)
 	return test_bit(AS_INACCESSIBLE, &mapping->flags);
 }
 
+static inline void mapping_set_writeback_may_deadlock_on_reclaim(struct address_space *mapping)
+{
+	set_bit(AS_WRITEBACK_MAY_DEADLOCK_ON_RECLAIM, &mapping->flags);
+}
+
+static inline bool mapping_writeback_may_deadlock_on_reclaim(struct address_space *mapping)
+{
+	return test_bit(AS_WRITEBACK_MAY_DEADLOCK_ON_RECLAIM, &mapping->flags);
+}
+
 static inline gfp_t mapping_gfp_mask(struct address_space * mapping)
 {
 	return mapping->gfp_mask;