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Tue, 19 Aug 2025 03:49:55 +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 O0oOFWP0o2gJawAAD6G6ig (envelope-from ); Tue, 19 Aug 2025 03:49:55 +0000 From: David Disseldorp To: linux-kbuild@vger.kernel.org, linux-fsdevel@vger.kernel.org Cc: linux-next@vger.kernel.org, ddiss@suse.de, nsc@kernel.org Subject: [PATCH v3 0/8] gen_init_cpio: add copy_file_range / reflink support Date: Tue, 19 Aug 2025 13:05:43 +1000 Message-ID: <20250819032607.28727-1-ddiss@suse.de> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-next@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Level: X-Spam-Flag: NO X-Rspamd-Queue-Id: B461F2125D X-Rspamd-Action: no action X-Rspamd-Server: rspamd1.dmz-prg2.suse.org X-Spamd-Result: default: False [-3.01 / 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)[]; R_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MIME_TRACE(0.00)[0:+]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; ARC_NA(0.00)[]; FUZZY_RATELIMITED(0.00)[rspamd.com]; RCVD_TLS_ALL(0.00)[]; DKIM_TRACE(0.00)[suse.de:+]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_FIVE(0.00)[5]; RCVD_COUNT_TWO(0.00)[2]; RCVD_VIA_SMTP_AUTH(0.00)[]; TO_DN_NONE(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:dkim,suse.de:mid] X-Spam-Score: -3.01 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 patch 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. A kernel initramfs extraction unit test for this is provided. Changes since v2 - add Nicolas' Reviewed-by tag to patches 1-7 - add patch 8 test for extracting a cpio archive with filename padding - use trailing '||' for multi-line if conditions instead of prefix - refer to -o output_file in usage instead of output_path - define _GNU_SOURCE alongside O_LARGEFILE use, instead of later Changes since v1 RFC - add alignment patches 6-7 - slightly rework commit and error messages - rename l->len to avoid 1/i confusion