kernel/linux
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ synced 2026-11-08 18:57:22 +00:00
Code Issues Releases Packages Activity
No description
1,383,821 commits 117 branches 5,824 tags 6.2 GiB
  • C 96.8%
  • Assembly 0.9%
  • Rust 0.7%
  • Shell 0.6%
  • Python 0.5%
  • Other 0.3%
Find a file
Qu Wenruo 3ea252a5c4 btrfs: fix symbolic link reading when bs > ps 
[ Upstream commit 67378b7546 ]

[BUG DURING BS > PS TEST]
When running the following script on a btrfs whose block size is larger
than page size, e.g. 8K block size and 4K page size, it will trigger a
kernel BUG:

  # mkfs.btrfs -s 8k $dev
  # mount $dev $mnt
  # mkdir $mnt/dir
  # ln -s dir $mnt/link
  # ls $mnt/link

The call trace looks like this:

  BTRFS warning (device dm-2): support for block size 8192 with page size 4096 is experimental, some features may be missing
  BTRFS info (device dm-2): checking UUID tree
  BTRFS info (device dm-2): enabling ssd optimizations
  BTRFS info (device dm-2): enabling free space tree
  ------------[ cut here ]------------
  kernel BUG at /home/adam/linux/include/linux/highmem.h:275!
  Oops: invalid opcode: 0000 [#1] SMP
  CPU: 8 UID: 0 PID: 667 Comm: ls Tainted: G           OE       6.17.0-rc4-custom+ #283 PREEMPT(full)
  Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE
  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS unknown 02/02/2022
  RIP: 0010:zero_user_segments.constprop.0+0xdc/0xe0 [btrfs]
  Call Trace:
   <TASK>
   btrfs_get_extent.cold+0x85/0x101 [btrfs 7453c70c03e631c8d8bfdd4264fa62d3e238da6f]
   btrfs_do_readpage+0x244/0x750 [btrfs 7453c70c03e631c8d8bfdd4264fa62d3e238da6f]
   btrfs_read_folio+0x9c/0x100 [btrfs 7453c70c03e631c8d8bfdd4264fa62d3e238da6f]
   filemap_read_folio+0x37/0xe0
   do_read_cache_folio+0x94/0x3e0
   __page_get_link.isra.0+0x20/0x90
   page_get_link+0x16/0x40
   step_into+0x69b/0x830
   path_lookupat+0xa7/0x170
   filename_lookup+0xf7/0x200
   ? set_ptes.isra.0+0x36/0x70
   vfs_statx+0x7a/0x160
   do_statx+0x63/0xa0
   __x64_sys_statx+0x90/0xe0
   do_syscall_64+0x82/0xae0
   entry_SYSCALL_64_after_hwframe+0x4b/0x53
   </TASK>

Please note bs > ps support is still under development and the
enablement patch is not even in btrfs development branch.

[CAUSE]
Btrfs reuses its data folio read path to handle symbolic links, as the
symbolic link target is stored as an inline data extent.

But for newly created inodes, btrfs only set the minimal order if the
target inode is a regular file.

Thus for above newly created symbolic link, it doesn't properly respect
the minimal folio order, and triggered the above crash.

[FIX]
Call btrfs_set_inode_mapping_order() unconditionally inside
btrfs_create_new_inode().

For symbolic links this will fix the crash as now the folio will meet
the minimal order.

For regular files this brings no change.

For directory/bdev/char and all the other types of inodes, they won't
go through the data read path, thus no effect either.

Fixes: cc38d178ff ("btrfs: enable large data folio support under CONFIG_BTRFS_EXPERIMENTAL")
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-10-15 12:03:18 +02:00
arch sched/fair: Get rid of sched_domains_curr_level hack for tl->cpumask() 2025-10-15 12:03:17 +02:00
block blk-mq: fix blk_mq_tags double free while nr_requests grown 2025-10-06 11:20:04 +02:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: rng - Ensure set_ent is always present 2025-10-12 13:01:57 +02:00
Documentation i2c-for-6.17-rc8 2025-09-28 13:19:23 -07:00
drivers EDAC/i10nm: Skip DIMM enumeration on a disabled memory controller 2025-10-15 12:03:17 +02:00
fs btrfs: fix symbolic link reading when bs > ps 2025-10-15 12:03:18 +02:00
include sched/fair: Get rid of sched_domains_curr_level hack for tl->cpumask() 2025-10-15 12:03:17 +02:00
init Fix CC_HAS_ASM_GOTO_OUTPUT on non-x86 architectures 2025-10-15 12:03:13 +02:00
io_uring io_uring-6.17-20250919 2025-09-19 12:10:49 -07:00
ipc vfs-6.17-rc1.mmap_prepare 2025-07-28 13:43:25 -07:00
kernel cpuset: fix failure to enable isolated partition when containing isolcpus 2025-10-15 12:03:18 +02:00
lib raid6: riscv: Clean up unused header file inclusion 2025-10-15 12:03:16 +02:00
LICENSES LICENSES: Replace the obsolete address of the FSF in the GFDL-1.2 2025-07-24 11:15:39 +02:00
mm mm: swap: check for stable address space before operating on the VMA 2025-10-06 11:20:05 +02:00
net net/9p: fix double req put in p9_fd_cancelled 2025-10-12 13:01:57 +02:00
rust rust: pci: fix incorrect platform reference in PCI driver unbind doc comment 2025-10-12 13:01:55 +02:00
samples 15 hotfixes. 11 are cc:stable and the remainder address post-6.16 issues 2025-09-17 21:34:26 -07:00
scripts gcc-plugins: Remove TODO_verify_il for GCC >= 16 2025-10-06 11:20:04 +02:00
security lsm: CONFIG_LSM can depend on CONFIG_SECURITY 2025-10-15 12:03:17 +02:00
sound ASoC: qcom: audioreach: fix potential null pointer dereference 2025-10-06 11:20:06 +02:00
tools selftests: cgroup: Make test_pids backwards compatible 2025-10-15 12:03:17 +02:00
usr usr/include: openrisc: don't HDRTEST bpf_perf_event.h 2025-05-12 15:03:17 +09:00
virt Merge tag 'kvm-x86-no_assignment-6.17' of https://github.com/kvm-x86/linux into HEAD 2025-07-29 08:36:42 -04:00
.clang-format Linux 6.15-rc5 2025-05-06 16:39:25 +10:00
.clippy.toml rust: clean Rust 1.88.0's warning about clippy::disallowed_macros configuration 2025-05-07 00:11:47 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore MAINTAINERS: remove Alyssa Rosenzweig 2025-09-18 21:17:31 +02:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore gitignore: allow .pylintrc to be tracked 2025-07-02 17:10:04 -06:00
.mailmap 7 hotfixes. 4 are cc:stable and the remainder address post-6.16 issues or 2025-09-28 09:32:00 -07:00
.pylintrc docs: add a .pylintrc file with sys path for docs scripts 2025-04-09 12:10:33 -06:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: retire Boris from TLS maintainers 2025-08-26 17:36:01 -07:00
Kbuild drm: ensure drm headers are self-contained and pass kernel-doc 2025-02-12 10:44:43 +02:00
Kconfig io_uring: Rename KConfig to Kconfig 2025-02-19 14:53:27 -07:00
MAINTAINERS i2c-for-6.17-rc8 2025-09-28 13:19:23 -07:00
Makefile Linux 6.17.2 2025-10-12 13:01:58 +02:00
README README: Fix spelling 2024-03-18 03:36:32 -06:00

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 reStructuredText 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.