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ceph: allow ceph.dir.rctime xattr to be updatable

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[ Upstream commit d7a2dc523085f8b8c60548ceedc696934aefeb0e ]

`rctime' has been a pain point in cephfs due to its buggy
nature - inconsistent values reported and those sorts.
Fixing rctime is non-trivial needing an overall redesign
of the entire nested statistics infrastructure.

As a workaround, PR

     http://github.com/ceph/ceph/pull/37938

allows this extended attribute to be manually set. This allows
users to "fixup" inconsistent rctime values. While this sounds
messy, its probably the wisest approach allowing users/scripts
to workaround buggy rctime values.

The above PR enables Ceph MDS to allow manually setting
rctime extended attribute with the corresponding user-land
changes. We may as well allow the same to be done via kclient
for parity.

Signed-off-by: Venky Shankar <vshankar@redhat.com>
Reviewed-by: Xiubo Li <xiubli@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Venky Shankar 2022-03-10 09:34:19 -05:00 committed by Greg Kroah-Hartman
parent 7fa8312879
commit 3e57686830
1 changed files with 9 additions and 1 deletions
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10
fs/ceph/xattr.c
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@ -317,6 +317,14 @@ static ssize_t ceph_vxattrcb_snap_btime(struct ceph_inode_info *ci, char *val,
}
#define XATTR_RSTAT_FIELD(_type, _name) \
XATTR_NAME_CEPH(_type, _name, VXATTR_FLAG_RSTAT)
#define XATTR_RSTAT_FIELD_UPDATABLE(_type, _name) \
{ \
.name = CEPH_XATTR_NAME(_type, _name), \
.name_size = sizeof (CEPH_XATTR_NAME(_type, _name)), \
.getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \
.exists_cb = NULL, \
.flags = VXATTR_FLAG_RSTAT, \
}
#define XATTR_LAYOUT_FIELD(_type, _name, _field) \
{ \
.name = CEPH_XATTR_NAME2(_type, _name, _field), \
@ -354,7 +362,7 @@ static struct ceph_vxattr ceph_dir_vxattrs[] = {
XATTR_RSTAT_FIELD(dir, rfiles),
XATTR_RSTAT_FIELD(dir, rsubdirs),
XATTR_RSTAT_FIELD(dir, rbytes),
XATTR_RSTAT_FIELD(dir, rctime),
XATTR_RSTAT_FIELD_UPDATABLE(dir, rctime),
{
.name = "ceph.dir.pin",
.name_size = sizeof("ceph.dir.pin"),