xfs: allow setting and clearing of log incompat feature flags

Source kernel commit: 908ce71e54f8265fa909200410d6c50ab9a2d302

Log incompat feature flags in the superblock exist for one purpose: to
protect the contents of a dirty log from replay on a kernel that isn't
prepared to handle those dirty contents.  This means that they can be
cleared if (a) we know the log is clean and (b) we know that there
aren't any other threads in the system that might be setting or relying
upon a log incompat flag.

Therefore, clear the log incompat flags when we've finished recovering
the log, when we're unmounting cleanly, remounting read-only, or
freezing; and provide a function so that subsequent patches can start
using this.

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>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>

diff --git a/libxfs/xfs_format.h b/libxfs/xfs_format.h
index 37570cf0537e6301ea5dd344a3ad7f63fda4af77..5d8a129150d54718205a851b1ae23569b70c8aac 100644 (file)
--- a/libxfs/xfs_format.h
+++ b/libxfs/xfs_format.h
@@ -495,6 +495,21 @@ xfs_sb_has_incompat_log_feature(
        return (sbp->sb_features_log_incompat & feature) != 0;
 }
 
+static inline void
+xfs_sb_remove_incompat_log_features(
+       struct xfs_sb   *sbp)
+{
+       sbp->sb_features_log_incompat &= ~XFS_SB_FEAT_INCOMPAT_LOG_ALL;
+}
+
+static inline void
+xfs_sb_add_incompat_log_features(
+       struct xfs_sb   *sbp,
+       unsigned int    features)
+{
+       sbp->sb_features_log_incompat |= features;
+}
+
 /*
  * V5 superblock specific feature checks
  */