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Message-ID: <176169814307.1428390.11550104537543281678.stgit@frogsfrogsfrogs> Date: Tue, 28 Oct 2025 17:40:31 -0700 From: "Darrick J. Wong" <djwong@...nel.org> To: djwong@...nel.org, bschubert@....com Cc: linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org, bernd@...ernd.com, miklos@...redi.hu, joannelkoong@...il.com, neal@...pa.dev Subject: [PATCHSET v6 3/5] libfuse: implement syncfs Hi all, Implement syncfs in libfuse so that iomap-compatible fuse servers can receive syncfs commands, and enable fuse servers to transmit inode flags to the kernel so that it can enforce sync, immutable, and append. Also enable some of the timestamp update mount options. If you're going to start using this code, I strongly recommend pulling from my git trees, which are linked below. With a bit of luck, this should all go splendidly. Comments and questions are, as always, welcome. --D kernel git tree: https://git.kernel.org/cgit/linux/kernel/git/djwong/xfs-linux.git/log/?h=fuse-iomap-attrs --- Commits in this patchset: * libfuse: add strictatime/lazytime mount options * libfuse: set sync, immutable, and append when loading files * libfuse: wire up FUSE_SYNCFS to the low level library * libfuse: add syncfs support to the upper library --- include/fuse.h | 5 +++++ include/fuse_common.h | 6 ++++++ include/fuse_kernel.h | 8 ++++++++ include/fuse_lowlevel.h | 16 ++++++++++++++++ lib/fuse.c | 31 +++++++++++++++++++++++++++++++ lib/fuse_lowlevel.c | 25 +++++++++++++++++++++++++ lib/mount.c | 18 ++++++++++++++++-- 7 files changed, 107 insertions(+), 2 deletions(-)
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