Merge tag 'fuse-update-6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse

Pull fuse updates from Miklos Szeredi:

 - Extend copy_file_range interface to be fully 64bit capable (Miklos)

 - Add selftest for fusectl (Chen Linxuan)

 - Move fuse docs into a separate directory (Bagas Sanjaya)

 - Allow fuse to enter freezable state in some cases (Sergey
   Senozhatsky)

 - Clean up writeback accounting after removing tmp page copies (Joanne)

 - Optimize virtiofs request handling (Li RongQing)

 - Add synchronous FUSE_INIT support (Miklos)

 - Allow server to request prune of unused inodes (Miklos)

 - Fix deadlock with AIO/sync release (Darrick)

 - Add some prep patches for block/iomap support (Darrick)

 - Misc fixes and cleanups

* tag 'fuse-update-6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse: (26 commits)
  fuse: move CREATE_TRACE_POINTS to a separate file
  fuse: move the backing file idr and code into a new source file
  fuse: enable FUSE_SYNCFS for all fuseblk servers
  fuse: capture the unique id of fuse commands being sent
  fuse: fix livelock in synchronous file put from fuseblk workers
  mm: fix lockdep issues in writeback handling
  fuse: add prune notification
  fuse: remove redundant calls to fuse_copy_finish() in fuse_notify()
  fuse: fix possibly missing fuse_copy_finish() call in fuse_notify()
  fuse: remove FUSE_NOTIFY_CODE_MAX from <uapi/linux/fuse.h>
  fuse: remove fuse_readpages_end() null mapping check
  fuse: fix references to fuse.rst -> fuse/fuse.rst
  fuse: allow synchronous FUSE_INIT
  fuse: zero initialize inode private data
  fuse: remove unused 'inode' parameter in fuse_passthrough_open
  virtio_fs: fix the hash table using in virtio_fs_enqueue_req()
  mm: remove BDI_CAP_WRITEBACK_ACCT
  fuse: use default writeback accounting
  virtio_fs: Remove redundant spinlock in virtio_fs_request_complete()
  fuse: remove unneeded offset assignment when filling write pages
  ...

7 files changed, 34 insertions, 9 deletions

diff --git a/Documentation/filesystems/fuse-io-uring.rst b/Documentation/filesystems/fuse/fuse-io-uring.rst
index d73dd0dbd238..d73dd0dbd238 100644
--- a/Documentation/filesystems/fuse-io-uring.rst
+++ b/Documentation/filesystems/fuse/fuse-io-uring.rst
diff --git a/Documentation/filesystems/fuse-io.rst b/Documentation/filesystems/fuse/fuse-io.rst
index 6464de4266ad..d736ac4cb483 100644
--- a/Documentation/filesystems/fuse-io.rst
+++ b/Documentation/filesystems/fuse/fuse-io.rst
@@ -1,7 +1,7 @@
 .. SPDX-License-Identifier: GPL-2.0
 
 ==============
-Fuse I/O Modes
+FUSE I/O Modes
 ==============
 
 Fuse supports the following I/O modes:
diff --git a/Documentation/filesystems/fuse-passthrough.rst b/Documentation/filesystems/fuse/fuse-passthrough.rst
index 2b0e7c2da54a..2b0e7c2da54a 100644
--- a/Documentation/filesystems/fuse-passthrough.rst
+++ b/Documentation/filesystems/fuse/fuse-passthrough.rst
diff --git a/Documentation/filesystems/fuse.rst b/Documentation/filesystems/fuse/fuse.rst
index 1e31e87aee68..0fbd5a03fdc9 100644
--- a/Documentation/filesystems/fuse.rst
+++ b/Documentation/filesystems/fuse/fuse.rst
@@ -1,8 +1,8 @@
 .. SPDX-License-Identifier: GPL-2.0
 
-====
-FUSE
-====
+=============
+FUSE Overview
+=============
 
 Definitions
 ===========
@@ -129,6 +129,20 @@ For each connection the following files exist within this directory:
 	  connection.  This means that all waiting requests will be aborted an
 	  error returned for all aborted and new requests.
 
+        max_background
+          The maximum number of background requests that can be outstanding
+          at a time. When the number of background requests reaches this limit,
+          further requests will be blocked until some are completed, potentially
+          causing I/O operations to stall.
+
+        congestion_threshold
+          The threshold of background requests at which the kernel considers
+          the filesystem to be congested. When the number of background requests
+          exceeds this value, the kernel will skip asynchronous readahead
+          operations, reducing read-ahead optimizations but preserving essential
+          I/O, as well as suspending non-synchronous writeback operations
+          (WB_SYNC_NONE), delaying page cache flushing to the filesystem.
+
 Only the owner of the mount may read or write these files.
 
 Interrupting filesystem operations
diff --git a/Documentation/filesystems/fuse/index.rst b/Documentation/filesystems/fuse/index.rst
new file mode 100644
index 000000000000..393a845214da
--- /dev/null
+++ b/Documentation/filesystems/fuse/index.rst
@@ -0,0 +1,14 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+======================================================
+FUSE (Filesystem in Userspace) Technical Documentation
+======================================================
+
+.. toctree::
+   :maxdepth: 2
+   :numbered:
+
+   fuse
+   fuse-io
+   fuse-io-uring
+   fuse-passthrough
diff --git a/Documentation/filesystems/index.rst b/Documentation/filesystems/index.rst
index 622187a96bdc..af516e528ded 100644
--- a/Documentation/filesystems/index.rst
+++ b/Documentation/filesystems/index.rst
@@ -95,10 +95,7 @@ Documentation for filesystem implementations.
    hfs
    hfsplus
    hpfs
-   fuse
-   fuse-io
-   fuse-io-uring
-   fuse-passthrough
+   fuse/index
    inotify
    isofs
    nilfs2
diff --git a/Documentation/filesystems/sysfs.rst b/Documentation/filesystems/sysfs.rst
index c32993bc83c7..be966f27f284 100644
--- a/Documentation/filesystems/sysfs.rst
+++ b/Documentation/filesystems/sysfs.rst
@@ -321,7 +321,7 @@ span multiple bus types).
 
 fs/ contains a directory for some filesystems.  Currently each
 filesystem wanting to export attributes must create its own hierarchy
-below fs/ (see ./fuse.rst for an example).
+below fs/ (see fuse/fuse.rst for an example).
 
 module/ contains parameter values and state information for all
 loaded system modules, for both builtin and loadable modules.