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Filipe Manana dc4a024b19 btrfs: avoid load/store tearing races when checking if an inode was logged 
[ Upstream commit 986bf6ed44 ]

At inode_logged() we do a couple lockless checks for ->logged_trans, and
these are generally safe except the second one in case we get a load or
store tearing due to a concurrent call updating ->logged_trans (either at
btrfs_log_inode() or later at inode_logged()).

In the first case it's safe to compare to the current transaction ID since
once ->logged_trans is set the current transaction, we never set it to a
lower value.

In the second case, where we check if it's greater than zero, we are prone
to load/store tearing races, since we can have a concurrent task updating
to the current transaction ID with store tearing for example, instead of
updating with a single 64 bits write, to update with two 32 bits writes or
four 16 bits writes. In that case the reading side at inode_logged() could
see a positive value that does not match the current transaction and then
return a false negative.

Fix this by doing the second check while holding the inode's spinlock, add
some comments about it too. Also add the data_race() annotation to the
first check to avoid any reports from KCSAN (or similar tools) and comment
about it.

Fixes: 0f8ce49821 ("btrfs: avoid inode logging during rename and link when possible")
Reviewed-by: Boris Burkov <boris@bur.io>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2025-09-09 18:56:19 +02:00
arch x86/microcode/AMD: Handle the case of no BIOS microcode 2025-09-04 15:30:26 +02:00
block block: reject invalid operation in submit_bio_noacct 2025-08-28 16:28:40 +02:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2025-04-25 10:45:58 +02:00
crypto crypto: jitter - fix intermediary handling 2025-08-28 16:28:26 +02:00
Documentation dt-bindings: display/msm: qcom,mdp5: drop lut clock 2025-09-04 15:30:22 +02:00
drivers Revert "drm/dp: Change AUX DPCD probe address from DPCD_REV to LANE0_1_STATUS" 2025-09-04 15:30:29 +02:00
fs btrfs: avoid load/store tearing races when checking if an inode was logged 2025-09-09 18:56:19 +02:00
include bpf: Fix oob access in cgroup local storage 2025-09-09 18:56:19 +02:00
init sched/isolation: Make CONFIG_CPU_ISOLATION depend on CONFIG_SMP 2025-05-02 07:50:57 +02:00
io_uring io_uring/net: commit partial buffers on retry 2025-08-28 16:28:11 +02:00
ipc ipc: fix to protect IPCS lookups using RCU 2025-06-27 11:08:49 +01:00
kernel bpf: Fix oob access in cgroup local storage 2025-09-09 18:56:19 +02:00
lib maple_tree: fix mt_destroy_walk() on root leaf node 2025-07-17 18:35:14 +02:00
LICENSES
mm mm/memory-failure: fix infinite UCE for VM_PFNMAP pfn 2025-08-28 16:28:43 +02:00
net net: rose: fix a typo in rose_clear_routes() 2025-09-04 15:30:28 +02:00
rust rust: module: place cleanup_module() in .exit.text section 2025-07-06 11:00:06 +02:00
samples samples: mei: Fix building on musl libc 2025-08-15 12:08:43 +02:00
scripts kconfig: lxdialog: fix 'space' to (de)select options 2025-08-28 16:28:29 +02:00
security apparmor: use the condition in AA_BUG_FMT even with debug disabled 2025-08-28 16:28:28 +02:00
sound ASoC: codecs: tx-macro: correct tx_macro_component_drv name 2025-09-04 15:30:19 +02:00
tools bonding: Add independent control state machine 2025-08-28 16:28:49 +02:00
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Makefile Linux 6.6.104 2025-09-04 15:30:29 +02:00
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.