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| author | Xiubo Li <xiubo.li@clyso.com> | 2026-09-02 23:59:02 -0700 |
|---|---|---|
| committer | Ilya Dryomov <idryomov@gmail.com> | 2026-10-26 14:15:47 +0100 |
| commit | 488ffbdd99d88b154d87d6362b90ba86bacca971 (patch) | |
| tree | 5787ec30f1055b7f29082d11287fc99f313041ca /include/linux | |
| parent | 1b0f779ca7fae0fd6cd6876bb0d012048c3d84c2 (diff) | |
ceph: add 'lazyio' mount option to kclient
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>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/ceph/ceph_fs.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/ceph/ceph_fs.h b/include/linux/ceph/ceph_fs.h index 0adc526ec321..d70bbce1a1b2 100644 --- a/include/linux/ceph/ceph_fs.h +++ b/include/linux/ceph/ceph_fs.h @@ -414,6 +414,7 @@ extern const char *ceph_mds_op_name(int op); #define CEPH_O_CREAT 00000100 #define CEPH_O_EXCL 00000200 #define CEPH_O_TRUNC 00001000 +#define CEPH_O_LAZY 00020000 #define CEPH_O_DIRECTORY 00200000 #define CEPH_O_NOFOLLOW 00400000 |