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| author | Darrick J. Wong <djwong@kernel.org> | 2021-08-08 18:27:12 +0300 |
|---|---|---|
| committer | Darrick J. Wong <djwong@kernel.org> | 2021-08-10 01:57:59 +0300 |
| commit | 2b73a2c817be58de2190940dbfa38dbf8a3806e6 (patch) | |
| tree | 68df03ee93057b05952770f03cd2581a2da0ebc2 /fs/xfs/xfs_log.h | |
| parent | 908ce71e54f8265fa909200410d6c50ab9a2d302 (diff) | |
| download | linux-2b73a2c817be58de2190940dbfa38dbf8a3806e6.tar.xz | |
xfs: clear log incompat feature bits when the log is idle
When there are no ongoing transactions and the log contents have been
checkpointed back into the filesystem, the log performs 'covering',
which is to say that it log a dummy transaction to record the fact that
the tail has caught up with the head. This is a good time to clear log
incompat feature flags, because they are flags that are temporarily set
to limit the range of kernels that can replay a dirty log.
Since it's possible that some other higher level thread is about to
start logging items protected by a log incompat flag, we create a rwsem
so that upper level threads can coordinate this with the log. It would
probably be more performant to use a percpu rwsem, but the ability to
/try/ taking the write lock during covering is critical, and percpu
rwsems do not provide that.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Allison Henderson <allison.henderson@oracle.com>
Reviewed-by: Chandan Babu R <chandanrlinux@gmail.com>
Diffstat (limited to 'fs/xfs/xfs_log.h')
| -rw-r--r-- | fs/xfs/xfs_log.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/xfs/xfs_log.h b/fs/xfs/xfs_log.h index 813b972e9788..b274fb9dcd8d 100644 --- a/fs/xfs/xfs_log.h +++ b/fs/xfs/xfs_log.h @@ -142,4 +142,7 @@ bool xfs_log_in_recovery(struct xfs_mount *); xfs_lsn_t xlog_grant_push_threshold(struct xlog *log, int need_bytes); +void xlog_use_incompat_feat(struct xlog *log); +void xlog_drop_incompat_feat(struct xlog *log); + #endif /* __XFS_LOG_H__ */ |