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Thu, 14 Aug 2025 05:48:38 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id hrUxALZ4nWiEYQAAD6G6ig (envelope-from ); Thu, 14 Aug 2025 05:48:37 +0000 From: David Disseldorp To: linux-kbuild@vger.kernel.org, linux-fsdevel@vger.kernel.org Cc: linux-next@vger.kernel.org Subject: [PATCH v2 0/7] gen_init_cpio: add copy_file_range / reflink support Date: Thu, 14 Aug 2025 15:17:58 +1000 Message-ID: <20250814054818.7266-1-ddiss@suse.de> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kbuild@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Level: X-Spamd-Result: default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[99.99%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-0.999]; MIME_GOOD(-0.10)[text/plain]; FUZZY_RATELIMITED(0.00)[rspamd.com]; RCVD_VIA_SMTP_AUTH(0.00)[]; MIME_TRACE(0.00)[0:+]; ARC_NA(0.00)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; FROM_EQ_ENVFROM(0.00)[]; TO_DN_NONE(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; RCVD_TLS_ALL(0.00)[] X-Spam-Flag: NO X-Spam-Score: -2.80 This patchset adds copy_file_range() support to gen_init_cpio. When combined with data segment alignment, large-file archiving performance is improved on Btrfs and XFS due to reflinks (see 7/7 benchmarks). cpio data segment alignment is provided by "bending" the newc spec to zero-pad the filename field. GNU cpio and Linux initramfs extractors handle this fine as long as PATH_MAX isn't exceeded. Changes since v1 RFC - add alignment patches 6-7 - slightly rework commit and error messages - rename l->len to avoid 1/i confusion David Disseldorp (7): gen_init_cpio: write to fd instead of stdout stream gen_init_cpio: support -o parameter gen_init_cpio: attempt copy_file_range for file data gen_init_cpio: avoid duplicate strlen calls gen_initramfs.sh: use gen_init_cpio -o parameter docs: initramfs: file data alignment via name padding gen_init_cpio: add -a as reflink optimization .../driver-api/early-userspace/buffer-format.rst | 5 + usr/gen_init_cpio.c | 234 ++++++++++++++------- usr/gen_initramfs.sh | 7 +- 3 files changed, 166 insertions(+), 80 deletions(-)