fs: add support for non-blocking timestamp updates

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Currently file_update_time_flags unconditionally returns -EAGAIN if any
timestamp needs to be updated and IOCB_NOWAIT is passed.  This makes
non-blocking direct writes impossible on file systems with granular
enough timestamps.

Pass IOCB_NOWAIT to ->update_time and return -EAGAIN if it could block.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://patch.msgid.link/20260108141934.2052404-9-hch@lst.de
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>

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Christoph Hellwig 2026-01-08 15:19:08 +01:00 • committed by Christian Brauner

parent 5cf06ea56e

commit 85c871a02b

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7 changed files with 50 additions and 11 deletions

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2

fs/btrfs/inode.c

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3

fs/gfs2/inode.c

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45

fs/inode.c

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3

fs/orangefs/inode.c

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fs/overlayfs/inode.c

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fs/ubifs/file.c

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fs/xfs/xfs_iops.c

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