nfs: add 'noalignwrite' option for lock-less 'lost writes' prevention

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There are some applications that write to predefined non-overlapping
file offsets from multiple clients and therefore don't need to rely on
file locking. However, if these applications want non-aligned offsets
and sizes they need to either use locks or risk data corruption, as the
NFS client defaults to extending writes to whole pages.

This commit adds a new mount option `noalignwrite`, which allows to turn
that off and avoid the need of locking, as long as these applications
don't overlap on offsets.

Signed-off-by: Dan Aloni <dan.aloni@vastdata.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>

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Dan Aloni 2024-07-24 14:07:12 +03:00 • committed by Anna Schumaker

parent 6d26c5e4d8

commit dfb07e990a

4 changed files with 15 additions and 0 deletions

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include/linux/nfs_fs_sb.h

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