[LU-16667] Linux 6.3 client support

Related — Sun, 5 Nov 2023 10:45:26 +0000

New struct mnt_idmap wraps user namespace struct and changes several inode_operations functions (getattr, setattr ...)

New header <linux/filelock.h> and also breaks locks_lock_file_wait() test.

struct kernel_cap_t changed from any array of u32s to a single u64 breaking several lustre apis.

Continue using the lower 32 bits to maintain compatibility:

As of linux commit v3.6-10973-g607ca46e97a1 lustre implicitly
started to ignore some capabilities, see: include/uapi/linux/capability.h
Last capability flag was added in linux commit v5.8-rc5-1-g124ea650d307
The capabilities the Lustre ignores are:

CAP_MAC_OVERRIDE
CAP_MAC_ADMIN
CAP_SYSLOG
CAP_WAKE_ALARM
CAP_BLOCK_SUSPEND
CAP_AUDIT_READ
CAP_PERFMON
CAP_BPF
CAP_CHECKPOINT_RESTORE
None of which appear to be important to Lustre operations and should
be fine to continue ignore.

Whamcloud Community JIRA

[LU-16667] Linux 6.3 client support