linux/Documentation/filesystems/index.rst
Linus Torvalds 2619a6d413 fuse update for 6.16
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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
  ...
2025-06-02 15:31:05 -07:00

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.. _filesystems_index:
===============================
Filesystems in the Linux kernel
===============================
This under-development manual will, some glorious day, provide
comprehensive information on how the Linux virtual filesystem (VFS) layer
works, along with the filesystems that sit below it. For now, what we have
can be found below.
Core VFS documentation
======================
See these manuals for documentation about the VFS layer itself and how its
algorithms work.
.. toctree::
:maxdepth: 2
vfs
path-lookup
api-summary
splice
locking
directory-locking
devpts
dnotify
fiemap
files
locks
multigrain-ts
mount_api
quota
seq_file
sharedsubtree
idmappings
iomap/index
automount-support
caching/index
porting
Filesystem support layers
=========================
Documentation for the support code within the filesystem layer for use in
filesystem implementations.
.. toctree::
:maxdepth: 2
buffer
journalling
fscrypt
fsverity
netfs_library
Filesystems
===========
Documentation for filesystem implementations.
.. toctree::
:maxdepth: 2
9p
adfs
affs
afs
autofs
autofs-mount-control
bcachefs/index
befs
bfs
btrfs
ceph
coda
configfs
cramfs
dax
debugfs
dlmfs
ecryptfs
efivarfs
erofs
ext2
ext3
ext4/index
f2fs
gfs2
gfs2-uevents
gfs2-glocks
hfs
hfsplus
hpfs
fuse
fuse-io
fuse-io-uring
fuse-passthrough
inotify
isofs
nilfs2
nfs/index
ntfs3
ocfs2
ocfs2-online-filecheck
omfs
orangefs
overlayfs
proc
qnx6
ramfs-rootfs-initramfs
relay
resctrl
romfs
smb/index
spufs/index
squashfs
sysfs
tmpfs
ubifs
ubifs-authentication
udf
virtiofs
vfat
xfs/index
zonefs