mirror of
https://github.com/flatpak/flatpak.git
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d18f026ee7
FICLONE is the new alias for the formerly btrfs-specific ioctl; XFS has experimental patches to support it. Further, we should use copy_file_range() for the case where we're only doing a limited copy. Both NFS and XFS (with reflink enabled) understand it. Part of the reason I'm doing this is so that ostree's `/etc` merge will start using XFS reflinks. But another major reason is to take the next step after and copy this code into GLib as well, so that all of the general GLib users will benefit; e.g. Nautilus will transparently do server copy offloads with NFS home directories. See also this coreutils thread about `copy_file_range()`: <https://debbugs.gnu.org/cgi/bugreport.cgi?bug=24399>. I don't care about file holes for our use cases, so it's fine. Other changes while I'm here: - Tweak the sendfile() case to match the newly inlined logic for cfr - Add a TEMP_FAILURE_RETRY() around the read()
96 lines
3.0 KiB
C
96 lines
3.0 KiB
C
/***
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This file was originally part of systemd.
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Copyright 2010 Lennart Poettering
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Copyright 2016 Zbigniew Jędrzejewski-Szmek
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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/* Missing glibc definitions to access certain kernel APIs */
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#if !HAVE_DECL_RENAMEAT2
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# ifndef __NR_renameat2
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# if defined __x86_64__
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# define __NR_renameat2 316
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# elif defined __arm__
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# define __NR_renameat2 382
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# elif defined _MIPS_SIM
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# if _MIPS_SIM == _MIPS_SIM_ABI32
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# define __NR_renameat2 4351
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# endif
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# if _MIPS_SIM == _MIPS_SIM_NABI32
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# define __NR_renameat2 6315
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# endif
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# if _MIPS_SIM == _MIPS_SIM_ABI64
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# define __NR_renameat2 5311
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# endif
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# elif defined __i386__
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# define __NR_renameat2 353
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# else
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# warning "__NR_renameat2 unknown for your architecture"
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# endif
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# endif
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static inline int renameat2(int oldfd, const char *oldname, int newfd, const char *newname, unsigned flags) {
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# ifdef __NR_renameat2
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return syscall(__NR_renameat2, oldfd, oldname, newfd, newname, flags);
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# else
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errno = ENOSYS;
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return -1;
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# endif
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}
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#endif
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/* Copied from systemd git:
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commit 6bda23dd6aaba50cf8e3e6024248cf736cc443ca
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Author: Yu Watanabe <watanabe.yu+github@gmail.com>
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AuthorDate: Thu Jul 27 20:22:54 2017 +0900
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Commit: Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>
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CommitDate: Thu Jul 27 07:22:54 2017 -0400
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*/
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#if !HAVE_DECL_COPY_FILE_RANGE
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# ifndef __NR_copy_file_range
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# if defined(__x86_64__)
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# define __NR_copy_file_range 326
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# elif defined(__i386__)
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# define __NR_copy_file_range 377
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# elif defined __s390__
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# define __NR_copy_file_range 375
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# elif defined __arm__
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# define __NR_copy_file_range 391
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# elif defined __aarch64__
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# define __NR_copy_file_range 285
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# elif defined __powerpc__
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# define __NR_copy_file_range 379
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# elif defined __arc__
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# define __NR_copy_file_range 285
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# else
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# warning "__NR_copy_file_range not defined for your architecture"
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# endif
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# endif
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static inline ssize_t copy_file_range(int fd_in, loff_t *off_in,
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int fd_out, loff_t *off_out,
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size_t len,
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unsigned int flags) {
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# ifdef __NR_copy_file_range
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return syscall(__NR_copy_file_range, fd_in, off_in, fd_out, off_out, len, flags);
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# else
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errno = ENOSYS;
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return -1;
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# endif
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}
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#endif
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