linux.git/tools/testing/selftests/filesystems/fuse, branch master Linux kernel source tree Merge tag 'fuse-update-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse 2026-08-25T14:59:44+00:00 Linus Torvalds torvalds@linux-foundation.org 2026-08-25T14:59:44+00:00 9cebfe6504488198b012e746bc6b313f88b95439 Pull fuse updates from Miklos Szeredi: - Improve performance of the io-uring transport by introducing buffer pools and zero-copy (Joanne) - Fix lots of bugs (Baokun Li) - Fix io-uring initialization issues (Joanne, Bernd) - More prep work for large folios (Joanne) - Don't limit buffered read to 128k (Jim Harris) - Fix zeroing of page end (dirtied with mmap) on file size extension (Jimmy Zuber) - Improve performance in certain cases with wake_up_sync() when queuing request (Xuewen Yan) - Misc fixes and cleanups (Xuewen Yan) * tag 'fuse-update-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse: (35 commits) fuse: zero the partial EOF page when extending a file io_uring: Add missing include for ITER_SOURCE and ITER_DEST fuse: Fix the condition to enable over-io-uring fuse: invalidate the correct range after O_APPEND direct write selftests/fuse: test post-EOF page zeroing when a file is extended fuse: wake one waiter per freed slot when raising max_background fuse: use min_not_zero() in fuse_init_server_timeout() fuse: copy request headers via a stack buffer for io-uring fuse: give wakeup hints to the scheduler for synchronous requests fuse: check for NULL root inode in fuse_fill_super_submount fuse: reject a duplicate fd= mount option cuse: wait for pending RCU callbacks on module exit fuse: fix invalidate lock leak on open O_TRUNC DAX failure fuse: fix invalidate lock leak on setattr writeback failure fuse: wait for FR_FINISHED on abort_on_kill to prevent use-after-free fuse: make dentry_tree_work static docs: fuse: document io-uring buffer pool and zero-copy uapi fuse: add zero-copy over io-uring fuse: support registered buffer pools in io-uring fuse: add io-uring buffer pools ... 
Pull fuse updates from Miklos Szeredi:

 - Improve performance of the io-uring transport by introducing buffer
   pools and zero-copy (Joanne)

 - Fix lots of bugs (Baokun Li)

 - Fix io-uring initialization issues (Joanne, Bernd)

 - More prep work for large folios (Joanne)

 - Don't limit buffered read to 128k (Jim Harris)

 - Fix zeroing of page end (dirtied with mmap) on file size extension
   (Jimmy Zuber)

 - Improve performance in certain cases with wake_up_sync() when queuing
   request (Xuewen Yan)

 - Misc fixes and cleanups (Xuewen Yan)

* tag 'fuse-update-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse: (35 commits)
  fuse: zero the partial EOF page when extending a file
  io_uring: Add missing include for ITER_SOURCE and ITER_DEST
  fuse: Fix the condition to enable over-io-uring
  fuse: invalidate the correct range after O_APPEND direct write
  selftests/fuse: test post-EOF page zeroing when a file is extended
  fuse: wake one waiter per freed slot when raising max_background
  fuse: use min_not_zero() in fuse_init_server_timeout()
  fuse: copy request headers via a stack buffer for io-uring
  fuse: give wakeup hints to the scheduler for synchronous requests
  fuse: check for NULL root inode in fuse_fill_super_submount
  fuse: reject a duplicate fd= mount option
  cuse: wait for pending RCU callbacks on module exit
  fuse: fix invalidate lock leak on open O_TRUNC DAX failure
  fuse: fix invalidate lock leak on setattr writeback failure
  fuse: wait for FR_FINISHED on abort_on_kill to prevent use-after-free
  fuse: make dentry_tree_work static
  docs: fuse: document io-uring buffer pool and zero-copy uapi
  fuse: add zero-copy over io-uring
  fuse: support registered buffer pools in io-uring
  fuse: add io-uring buffer pools
  ...
selftests/fuse: test post-EOF page zeroing when a file is extended 2026-08-24T10:18:02+00:00 Jimmy Zuber jamz@amazon.com 2026-07-31T20:38:42+00:00 60dbcce1567f6502215b36ba4066e8fd1f86d706 Add a regression test for the bug where extending a file left the tail of the old partial EOF page exposing stale mmap-dirtied data instead of zeros. The test is a self-contained raw /dev/fuse server (no libfuse dependency) that runs without writeback_cache and returns FOPEN_KEEP_CACHE, the configuration in which the bug is visible. Its backing data is always zero in the hole, so any non-zero byte a read sees is stale page-cache data. All offsets are relative to the runtime page size. Four cases: - write_extend: pollute the post-EOF tail, extend past it by writing into a later page, and verify the tail reads back as zero; - ftruncate_extend: same, but extend via ftruncate(); - fallocate_extend: same, but extend via fallocate() at the old EOF; - extend_into_eof_page_preserves_data: an extending write landing inside the old EOF page must not be clobbered by the zeroing. Each case fails without the fix and passes with it. Signed-off-by: Jimmy Zuber <jamz@amazon.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> 
Add a regression test for the bug where extending a file left the tail of
the old partial EOF page exposing stale mmap-dirtied data instead of zeros.

The test is a self-contained raw /dev/fuse server (no libfuse dependency)
that runs without writeback_cache and returns FOPEN_KEEP_CACHE, the
configuration in which the bug is visible.  Its backing data is always zero
in the hole, so any non-zero byte a read sees is stale page-cache data.
All offsets are relative to the runtime page size.  Four cases:

  - write_extend: pollute the post-EOF tail, extend past it by writing into
    a later page, and verify the tail reads back as zero;
  - ftruncate_extend: same, but extend via ftruncate();
  - fallocate_extend: same, but extend via fallocate() at the old EOF;
  - extend_into_eof_page_preserves_data: an extending write landing inside
    the old EOF page must not be clobbered by the zeroing.

Each case fails without the fix and passes with it.

Signed-off-by: Jimmy Zuber <jamz@amazon.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
selftests/fuse: add ACL_DONT_CACHE regression test 2026-07-21T20:04:02+00:00 Amir Goldstein amir73il@gmail.com 2026-07-13T22:09:32+00:00 9acb102522b92f24fba6b238b3668a4d9dfcb592 Add a test that reproduces the stale ACL bug fixed by: "fs: preserve ACL_DONT_CACHE state in forget_cached_acl()" A FUSE mount that does not negotiate FUSE_POSIX_ACL initialises inodes with i_acl = ACL_DONT_CACHE. Before the fix, calling forget_all_cached_acls() (e.g. from fuse_update_get_attr() on a statx(AT_STATX_FORCE_SYNC)) would silently replace ACL_DONT_CACHE with ACL_NOT_CACHED, enabling the kernel ACL cache. A subsequent getxattr would populate the cache, and because fuse_set_acl() skips forget_all_cached_acls() for !fc->posix_acl, later ACL changes were not visible to callers — getxattr returned stale data. The test mounts a minimal libfuse3 lowlevel filesystem (no FUSE_POSIX_ACL negotiated) and: 1. Issues two getxattrs — both must reach the daemon, proving ACL_DONT_CACHE suppresses caching before any trigger. 2. Calls statx(AT_STATX_FORCE_SYNC) to trigger forget_all_cached_acls(). 3. Issues another getxattr (populates the cache on a buggy kernel). 4. Switches the daemon to a different-sized ACL (ACL_B). 5. Issues a final getxattr — expects ACL_B (44 bytes) and daemon call count 4; a buggy kernel returns stale ACL_A (28 bytes). fuse_acl_cache_test is only built when libfuse3 is detected via pkg-config. Christian Brauner <brauner@kernel.org> says: Changed do_force_statx() to call the statx() libc wrapper instead of syscall(SYS_statx, ...) as requested by Amir after review feedback from Luis Henriques, and dropped the now unused <sys/syscall.h> include. Signed-off-by: Amir Goldstein <amir73il@gmail.com> Link: https://patch.msgid.link/20260713220932.413004-3-amir73il@gmail.com Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org> 
Add a test that reproduces the stale ACL bug fixed by:
  "fs: preserve ACL_DONT_CACHE state in forget_cached_acl()"

A FUSE mount that does not negotiate FUSE_POSIX_ACL initialises inodes
with i_acl = ACL_DONT_CACHE.  Before the fix, calling
forget_all_cached_acls() (e.g. from fuse_update_get_attr() on a
statx(AT_STATX_FORCE_SYNC)) would silently replace ACL_DONT_CACHE with
ACL_NOT_CACHED, enabling the kernel ACL cache.  A subsequent getxattr
would populate the cache, and because fuse_set_acl() skips
forget_all_cached_acls() for !fc->posix_acl, later ACL changes were
not visible to callers — getxattr returned stale data.

The test mounts a minimal libfuse3 lowlevel filesystem (no
FUSE_POSIX_ACL negotiated) and:
  1. Issues two getxattrs — both must reach the daemon, proving
     ACL_DONT_CACHE suppresses caching before any trigger.
  2. Calls statx(AT_STATX_FORCE_SYNC) to trigger forget_all_cached_acls().
  3. Issues another getxattr (populates the cache on a buggy kernel).
  4. Switches the daemon to a different-sized ACL (ACL_B).
  5. Issues a final getxattr — expects ACL_B (44 bytes) and daemon
     call count 4; a buggy kernel returns stale ACL_A (28 bytes).

fuse_acl_cache_test is only built when libfuse3 is detected via
pkg-config.

Christian Brauner <brauner@kernel.org> says:
Changed do_force_statx() to call the statx() libc wrapper instead of
syscall(SYS_statx, ...) as requested by Amir after review feedback from
Luis Henriques, and dropped the now unused <sys/syscall.h> include.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Link: https://patch.msgid.link/20260713220932.413004-3-amir73il@gmail.com
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
selftests: complete kselftest include centralization 2025-11-27T22:24:31+00:00 Bala-Vignesh-Reddy reddybalavignesh9979@gmail.com 2025-10-16T10:44:09+00:00 e6fbd1759c9ece5044d3470f30a5e2166dc9de89 This follow-up patch completes centralization of kselftest.h and ksefltest_harness.h includes in remaining seltests files, replacing all relative paths with a non-relative paths using shared -I include path in lib.mk Tested with gcc-13.3 and clang-18.1, and cross-compiled successfully on riscv, arm64, x86_64 and powerpc arch. [reddybalavignesh9979@gmail.com: add selftests include path for kselftest.h] Link: https://lkml.kernel.org/r/20251017090201.317521-1-reddybalavignesh9979@gmail.com Link: https://lkml.kernel.org/r/20251016104409.68985-1-reddybalavignesh9979@gmail.com Signed-off-by: Bala-Vignesh-Reddy <reddybalavignesh9979@gmail.com> Suggested-by: Andrew Morton <akpm@linux-foundation.org> Link: https://lore.kernel.org/lkml/20250820143954.33d95635e504e94df01930d0@linux-foundation.org/ Reviewed-by: Wei Yang <richard.weiyang@gmail.com> Cc: David Hildenbrand <david@redhat.com> Cc: David S. Miller <davem@davemloft.net> Cc: Eric Dumazet <edumazet@google.com> Cc: Günther Noack <gnoack@google.com> Cc: Jakub Kacinski <kuba@kernel.org> Cc: Liam Howlett <liam.howlett@oracle.com> Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Mickael Salaun <mic@digikod.net> Cc: Ming Lei <ming.lei@redhat.com> Cc: Paolo Abeni <pabeni@redhat.com> Cc: Shuah Khan <shuah@kernel.org> Cc: Simon Horman <horms@kernel.org> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> 
This follow-up patch completes centralization of kselftest.h and
ksefltest_harness.h includes in remaining seltests files, replacing all
relative paths with a non-relative paths using shared -I include path in
lib.mk

Tested with gcc-13.3 and clang-18.1, and cross-compiled successfully on
riscv, arm64, x86_64 and powerpc arch.

[reddybalavignesh9979@gmail.com: add selftests include path for kselftest.h]
  Link: https://lkml.kernel.org/r/20251017090201.317521-1-reddybalavignesh9979@gmail.com
Link: https://lkml.kernel.org/r/20251016104409.68985-1-reddybalavignesh9979@gmail.com
Signed-off-by: Bala-Vignesh-Reddy <reddybalavignesh9979@gmail.com>
Suggested-by: Andrew Morton <akpm@linux-foundation.org>
Link: https://lore.kernel.org/lkml/20250820143954.33d95635e504e94df01930d0@linux-foundation.org/
Reviewed-by: Wei Yang <richard.weiyang@gmail.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Günther Noack <gnoack@google.com>
Cc: Jakub Kacinski <kuba@kernel.org>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mickael Salaun <mic@digikod.net>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Simon Horman <horms@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
selftests: filesystems: Add functional test for the abort file in fusectl 2025-08-27T12:29:43+00:00 Chen Linxuan chenlinxuan@uniontech.com 2025-06-10T02:10:03+00:00 1a7b13781b0d48312e0ead2585776b0afd1343cd This patch add a simple functional test for the "abort" file in fusectlfs (/sys/fs/fuse/connections/ID/abort). A simple fuse daemon is added for testing. Related discussion can be found in the link below. Link: https://lore.kernel.org/all/CAOQ4uxjKFXOKQxPpxtS6G_nR0tpw95w0GiO68UcWg_OBhmSY=Q@mail.gmail.com/ Signed-off-by: Chen Linxuan <chenlinxuan@uniontech.com> Acked-by: Shuah Khan <skhan@linuxfoundation.org> Reviewed-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> 
This patch add a simple functional test for the "abort" file
in fusectlfs (/sys/fs/fuse/connections/ID/abort).

A simple fuse daemon is added for testing.

Related discussion can be found in the link below.

Link: https://lore.kernel.org/all/CAOQ4uxjKFXOKQxPpxtS6G_nR0tpw95w0GiO68UcWg_OBhmSY=Q@mail.gmail.com/
Signed-off-by: Chen Linxuan <chenlinxuan@uniontech.com>
Acked-by: Shuah Khan <skhan@linuxfoundation.org>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>