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Darrick J. Wong 30c6a7a9da xfs: don't over-report free space or inodes in statvfs 
[ Upstream commit 4b8d867ca6 ]

Emmanual Florac reports a strange occurrence when project quota limits
are enabled, free space is lower than the remaining quota, and someone
runs statvfs:

  # mkfs.xfs -f /dev/sda
  # mount /dev/sda /mnt -o prjquota
  # xfs_quota  -x -c 'limit -p bhard=2G 55' /mnt
  # mkdir /mnt/dir
  # xfs_io -c 'chproj 55' -c 'chattr +P' -c 'stat -vvvv' /mnt/dir
  # fallocate -l 19g /mnt/a
  # df /mnt /mnt/dir
  Filesystem      Size  Used Avail Use% Mounted on
  /dev/sda         20G   20G  345M  99% /mnt
  /dev/sda        2.0G     0  2.0G   0% /mnt

I think the bug here is that xfs_fill_statvfs_from_dquot unconditionally
assigns to f_bfree without checking that the filesystem has enough free
space to fill the remaining project quota.  However, this is a
longstanding behavior of xfs so it's unclear what to do here.

Cc: <stable@vger.kernel.org> # v2.6.18
Fixes: 932f2c3231 ("[XFS] statvfs component of directory/project quota support, code originally by Glen.")
Reported-by: Emmanuel Florac <eflorac@intellique.com>
Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-02-17 10:04:57 +01:00
arch KVM: e500: always restore irqs 2025-02-17 10:04:56 +01:00
block partitions: ldm: remove the initial kernel-doc notation 2025-02-08 09:56:52 +01:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: api - Fix boot-up self-test race 2025-02-08 09:57:28 +01:00
Documentation drm: Add panel backlight quirks 2025-02-17 10:04:45 +01:00
drivers drm/amdgpu: Fix Circular Locking Dependency in AMDGPU GFX Isolation 2025-02-17 10:04:57 +01:00
fs xfs: don't over-report free space or inodes in statvfs 2025-02-17 10:04:57 +01:00
include Input: allocate keycode for phone linking 2025-02-17 10:04:55 +01:00
init Compiler Attributes: disable __counted_by for clang < 19.1.3 2024-12-05 14:02:45 +01:00
io_uring io_uring/uring_cmd: use cached cmd_op in io_uring_cmd_sock() 2025-02-08 09:58:10 +01:00
ipc ipc: fix memleak if msg_init_ns failed in create_ipc_ns 2024-12-05 14:03:02 +01:00
kernel ring-buffer: Make reading page consistent with the code logic 2025-02-17 10:04:49 +01:00
lib lockdep: Fix upper limit for LOCKDEP_*_BITS configs 2025-02-17 10:04:44 +01:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm memcg: fix soft lockup in the OOM process 2025-02-08 09:58:19 +01:00
net tipc: re-order conditions in tipc_crypto_key_rcv() 2025-02-17 10:04:53 +01:00
rust rust: kbuild: set bindgen's Rust target version 2024-12-19 18:13:22 +01:00
samples samples/landlock: Fix possible NULL dereference in parse_path() 2025-02-08 09:57:11 +01:00
scripts kbuild: switch from lz4c to lz4 for compression 2025-02-08 09:58:12 +01:00
security tomoyo: don't emit warning in tomoyo_write_control() 2025-02-17 10:04:50 +01:00
sound ASoC: amd: Add ACPI dependency to fix build error 2025-02-17 10:04:55 +01:00
tools selftests/net/ipsec: Fix Null pointer dereference in rtattr_pack() 2025-02-17 10:04:54 +01:00
usr initramfs: shorten cmd_initfs in usr/Makefile 2024-07-16 01:07:52 +09:00
virt KVM: x86: switch hugepage recovery thread to vhost_task 2024-12-05 14:02:43 +01:00
.clang-format clang-format: Update with v6.11-rc1's for_each macro list 2024-08-02 13:20:31 +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 Add Jeff Kirsher to .get_maintainer.ignore 2024-03-08 11:36:54 +00:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore Kbuild updates for v6.12 2024-09-24 13:02:06 -07:00
.mailmap mailmap: add entry for Thorsten Blum 2024-11-07 14:14:59 -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 self from DSA entry 2024-11-03 12:52:38 -08:00
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: update location of media main tree 2024-12-05 14:02:42 +01:00
Makefile Linux 6.12.13 2025-02-08 09:58:20 +01:00
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.