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Qu Wenruo 72c49143fb btrfs: avoid unnecessary device path update for the same device 
[ Upstream commit 2e8b6bc0ab ]

[PROBLEM]
It is very common for udev to trigger device scan, and every time a
mounted btrfs device got re-scan from different soft links, we will get
some of unnecessary device path updates, this is especially common
for LVM based storage:

 # lvs
  scratch1 test -wi-ao---- 10.00g
  scratch2 test -wi-a----- 10.00g
  scratch3 test -wi-a----- 10.00g
  scratch4 test -wi-a----- 10.00g
  scratch5 test -wi-a----- 10.00g
  test     test -wi-a----- 10.00g

 # mkfs.btrfs -f /dev/test/scratch1
 # mount /dev/test/scratch1 /mnt/btrfs
 # dmesg -c
 [  205.705234] BTRFS: device fsid 7be2602f-9e35-4ecf-a6ff-9e91d2c182c9 devid 1 transid 6 /dev/mapper/test-scratch1 (253:4) scanned by mount (1154)
 [  205.710864] BTRFS info (device dm-4): first mount of filesystem 7be2602f-9e35-4ecf-a6ff-9e91d2c182c9
 [  205.711923] BTRFS info (device dm-4): using crc32c (crc32c-intel) checksum algorithm
 [  205.713856] BTRFS info (device dm-4): using free-space-tree
 [  205.722324] BTRFS info (device dm-4): checking UUID tree

So far so good, but even if we just touched any soft link of
"dm-4", we will get quite some unnecessary device path updates.

 # touch /dev/mapper/test-scratch1
 # dmesg -c
 [  469.295796] BTRFS info: devid 1 device path /dev/mapper/test-scratch1 changed to /dev/dm-4 scanned by (udev-worker) (1221)
 [  469.300494] BTRFS info: devid 1 device path /dev/dm-4 changed to /dev/mapper/test-scratch1 scanned by (udev-worker) (1221)

Such device path rename is unnecessary and can lead to random path
change due to the udev race.

[CAUSE]
Inside device_list_add(), we are using a very primitive way checking if
the device has changed, strcmp().

Which can never handle links well, no matter if it's hard or soft links.

So every different link of the same device will be treated as a different
device, causing the unnecessary device path update.

[FIX]
Introduce a helper, is_same_device(), and use path_equal() to properly
detect the same block device.
So that the different soft links won't trigger the rename race.

Reviewed-by: Filipe Manana <fdmanana@suse.com>
Link: https://bugzilla.suse.com/show_bug.cgi?id=1230641
Reported-by: Fabian Vogt <fvogt@suse.com>
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 2024-12-14 19:54:37 +01:00
arch s390/cpum_sf: Handle CPU hotplug remove during sampling 2024-12-14 19:54:37 +01:00
block block: fix ordering between checking BLK_MQ_S_STOPPED request adding 2024-12-14 19:54:04 +01:00
certs certs: Fix build error when PKCS#11 URI contains semicolon 2023-02-09 11:28:11 +01:00
crypto crypto: api - Add crypto_clone_tfm 2024-12-14 19:53:51 +01:00
Documentation dt-bindings: serial: rs485: Fix rs485-rts-delay property 2024-12-14 19:54:03 +01:00
drivers iommu/arm-smmu: Defer probe of clients after smmu device bound 2024-12-14 19:54:37 +01:00
fs btrfs: avoid unnecessary device path update for the same device 2024-12-14 19:54:37 +01:00
include epoll: annotate racy check 2024-12-14 19:54:37 +01:00
init initramfs: avoid filename buffer overrun 2024-12-14 19:53:14 +01:00
io_uring io_uring: fix possible deadlock in io_register_iowq_max_workers() 2024-11-17 15:07:21 +01:00
ipc ipc: fix memleak if msg_init_ns failed in create_ipc_ns 2024-12-14 19:54:06 +01:00
kernel bpf: fix OOB devmap writes when deleting elements 2024-12-14 19:54:35 +01:00
lib lib: stackinit: hide never-taken branch from compiler 2024-12-14 19:54:37 +01:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm mm: page_alloc: move mlocked flag clearance into free_pages_prepare() 2024-12-14 19:54:31 +01:00
net xsk: fix OOB map writes when deleting elements 2024-12-14 19:54:36 +01:00
rust rust: macros: provide correct provenance when constructing THIS_MODULE 2024-10-17 15:22:24 +02:00
samples bpf: Fix the xdp_adjust_tail sample prog issue 2024-12-14 19:53:27 +01:00
scripts modpost: Add .irqentry.text to OTHER_SECTIONS 2024-12-14 19:54:35 +01:00
security apparmor: test: Fix memory leak for aa_unpack_strdup() 2024-12-14 19:53:59 +01:00
sound ALSA: hda/realtek: Add support for Samsung Galaxy Book3 360 (NP730QFG) 2024-12-14 19:54:33 +01:00
tools tools: Override makefile ARCH variable if defined, but empty 2024-12-14 19:54:30 +01:00
usr usr/gen_init_cpio.c: remove unnecessary -1 values from int file 2022-10-03 14:21:44 -07:00
virt KVM: Fix a data race on last_boosted_vcpu in kvm_vcpu_on_spin() 2024-06-27 13:46:21 +02:00
.clang-format inet: ping: use hlist_nulls rcu iterator during lookup 2022-12-01 12:42:46 +01:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore Remove *.orig pattern from .gitignore 2024-10-17 15:21:15 +02:00
.mailmap 9 hotfixes. 6 for MM, 3 for other areas. Four of these patches address 2022-12-10 17:10:52 -08:00
.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: Remove Michal Marek from Kbuild maintainers 2022-11-16 14:53:00 +09:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS MAINTAINERS: add leah to 6.1 MAINTAINERS file 2024-05-17 11:56:16 +02:00
Makefile Linux 6.1.119 2024-11-22 15:37:35 +01:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -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 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.