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Filipe Manana 45c4102f0d btrfs: avoid transaction commit on any fsync after subvolume creation 
As of commit 1b53e51a4a ("btrfs: don't commit transaction for every
subvol create") we started to make any fsync after creating a subvolume
to fallback to a transaction commit if the fsync is performed in the
same transaction that was used to create the subvolume. This happens
with the following at ioctl.c:create_subvol():

  $ cat fs/btrfs/ioctl.c
  (...)
      /* Tree log can't currently deal with an inode which is a new root. */
      btrfs_set_log_full_commit(trans);
  (...)

Note that the comment is misleading as the problem is not that fsync can
not deal with the root inode of a new root, but that we can not log any
inode that belongs to a root that was not yet persisted because that would
make log replay fail since the root doesn't exist at log replay time.

The above simply makes any fsync fallback to a full transaction commit if
it happens in the same transaction used to create the subvolume - even if
it's an inode that belongs to any other subvolume. This is a brute force
solution and it doesn't necessarily improve performance for every workload
out there - it just moves a full transaction commit from one place, the
subvolume creation, to another - an fsync for any inode.

Just improve on this by making the fallback to a transaction commit only
for an fsync against an inode of the new subvolume, or for the directory
that contains the dentry that points to the new subvolume (in case anyone
attempts to fsync the directory in the same transaction).

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2024-07-11 15:33:24 +02:00
arch powerpc fixes for 6.10 #4 2024-07-06 18:31:24 -07:00
block block: unmap and free user mapped integrity via submitter 2024-06-12 11:00:50 -06:00
certs kbuild: use $(src) instead of $(srctree)/$(src) for source directory 2024-05-10 04:34:52 +09:00
crypto This push fixes a bug in the new ecc P521 code as well as a buggy 2024-05-20 08:47:54 -07:00
Documentation RISC-V Fixes for 6.10-rc7 2024-07-05 12:22:51 -07:00
drivers A set of clk fixes for the Qualcomm, Mediatek, and Allwinner drivers: 2024-07-07 10:59:38 -07:00
fs btrfs: avoid transaction commit on any fsync after subvolume creation 2024-07-11 15:33:24 +02:00
include btrfs: remove extent_map::block_start member 2024-07-11 15:33:21 +02:00
init gcc: disable '-Warray-bounds' for gcc-9 2024-06-15 10:43:04 -07:00
io_uring io_uring/net: don't clear msg_inq before io_recv_buf_select() needs it 2024-07-02 09:42:10 -06:00
ipc Mainly singleton patches, documented in their respective changelogs. 2024-05-19 14:02:03 -07:00
kernel mm: optimize the redundant loop of mm_update_owner_next() 2024-07-03 12:29:24 -07:00
lib hardening fixes for v6.10-rc6 2024-06-28 16:11:02 -07:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm mm: avoid overflows in dirty throttling logic 2024-07-03 12:29:24 -07:00
net Including fixes from bluetooth, wireless and netfilter. 2024-07-04 10:11:12 -07:00
rust rust: avoid unused import warning in rusttest 2024-06-11 23:33:28 +02:00
samples tracing/treewide: Remove second parameter of __assign_str() 2024-05-22 20:14:47 -04:00
scripts kbuild: scripts/gdb: bring the "abspath" back 2024-06-27 04:20:32 +09:00
security integrity-v6.10-fix 2024-07-05 16:21:54 -07:00
sound ASoC: Fixes for v6.10 2024-06-26 22:02:55 +02:00
tools powerpc fixes for 6.10 #4 2024-07-06 18:31:24 -07:00
usr kbuild: use $(src) instead of $(srctree)/$(src) for source directory 2024-05-10 04:34:52 +09:00
virt KVM fixes for 6.10 2024-06-21 08:03:55 -04:00
.clang-format clang-format: Update with v6.7-rc4's for_each macro list 2023-12-08 23:54:38 +01:00
.cocciconfig
.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: create a list of all built DTB files 2024-02-19 18:20:39 +09:00
.mailmap bpf-for-netdev 2024-06-14 17:57:10 -07:00
.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 pci-v6.10-fixes-2 2024-07-05 12:33:00 -07:00
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 pci-v6.10-fixes-2 2024-07-05 12:33:00 -07:00
Makefile Linux 6.10-rc7 2024-07-07 14:23:46 -07:00
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.