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ceph: disable inline data support

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Inline data support has been deprecated in the CephFS MDS and is
being formally removed.  Existing inline data can be migrated to
data pool objects via MDS scrub (see PR #44359).

Add CONFIG_CEPH_FS_INLINE_DATA (default n) to gate all inline data
code in the kclient.  When disabled, CEPH_FEATURE_MDS_INLINE_DATA is
not advertised to the MDS, which will then refuse to open files that
still have inline data, returning -EPERM and preventing silent data
corruption that would occur if the kclient tried to read inline data
from OSD objects that do not contain it.

The conditional compilation is centralized in fs/ceph/super.h, where
static inline helpers make all the inline data code compile out
cleanly when the option is disabled, so that removing the option
later only touches that one place.  ceph_inline_version() returns
CEPH_INLINE_NONE when the option is disabled, which makes every
version comparison in the disabled build constant-fold to false;
the stubbed out ceph_uninline_data() and ceph_fill_inline_data() are
then unreachable.

The MDS still carries inline_version + inline_data on the wire, so
the reply and cap grant parsers keep consuming those fields even
with the option disabled, only skipping them, to keep the decode
pointer in sync for the fields that follow.

This config option will be kept for a transitional period to
allow existing CephFS deployments to migrate inline data via
MDS scrub.  Once the migration period ends, the option and all
inline data code will be permanently removed.

Users upgrading from an older Ceph release should ensure all inline
data has been migrated before deploying a kclient with this option
disabled:
  1. Enable and run MDS scrub to uninline existing data
  2. Disable inline_data on the filesystem:
     ceph fs set <fs> inline_data false --yes-i-really-really-mean-it

Link: https://tracker.ceph.com/issues/67769
Signed-off-by: Xiubo Li <xiubo.li@clyso.com>
Reviewed-by: Alex Markuze <amarkuze@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Xiubo Li 2026-08-25 23:30:02 -07:00 • committed by Ilya Dryomov
commit 3f8bbbb580
9 changed files with 167 additions and 32 deletions
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