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Add a 'lazyio' mount option to the kernel Ceph client that enables
LazyIO globally for all regular file opens on a mount. This is the
kclient equivalent of the 'client_force_lazyio=true' config option
in the ceph-fuse userspace client.
When 'lazyio' is specified, CEPH_FILE_MODE_LAZY is automatically
added to every regular file's fmode at open time in ceph_open() and
ceph_atomic_open(), causing the I/O paths to request
CEPH_CAP_FILE_LAZYIO from the MDS. This permits buffered I/O via
the page cache even when multiple clients have the file open for
write — beneficial for HPC workloads that can tolerate relaxed
cache coherency.
The mount option is exposed as 'lazyio' / 'nolazyio' via the VFS
fsparam_flag_no mechanism and supports remount.
Link: https://tracker.ceph.com/issues/77594
Signed-off-by: Xiubo Li <xiubo.li@clyso.com>
Reviewed-by: Alex Markuze <amarkuze@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
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