diff mbox series

[10/45] xfs: define locking primitives for realtime groups

Message ID 167243878495.731133.7722543578089824290.stgit@magnolia (mailing list archive)
State Superseded, archived
Headers show
Series libxfs: shard the realtime section | expand

Commit Message

Darrick J. Wong Dec. 30, 2022, 10:19 p.m. UTC 
From: Darrick J. Wong <djwong@kernel.org>

Define helper functions to lock all metadata inodes related to a
realtime group.  There's not much to look at now, but this will become
important when we add per-rtgroup metadata files and online fsck code
for them.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
---
 libxfs/xfs_rtgroup.c |   33 +++++++++++++++++++++++++++++++++
 libxfs/xfs_rtgroup.h |   14 ++++++++++++++
 2 files changed, 47 insertions(+)
diff mbox series

Patch

diff --git a/libxfs/xfs_rtgroup.c b/libxfs/xfs_rtgroup.c
index 9caf39fd51a..86751cb8d31 100644
--- a/libxfs/xfs_rtgroup.c
+++ b/libxfs/xfs_rtgroup.c
@@ -496,3 +496,36 @@  xfs_rtgroup_update_secondary_sbs(
 
 	return saved_error ? saved_error : error;
 }
+
+/* Lock metadata inodes associated with this rt group. */
+void
+xfs_rtgroup_lock(
+	struct xfs_trans	*tp,
+	struct xfs_rtgroup	*rtg,
+	unsigned int		rtglock_flags)
+{
+	ASSERT(!(rtglock_flags & ~XFS_RTGLOCK_ALL_FLAGS));
+	ASSERT(!(rtglock_flags & XFS_RTGLOCK_BITMAP_SHARED) ||
+	       !(rtglock_flags & XFS_RTGLOCK_BITMAP));
+
+	if (rtglock_flags & XFS_RTGLOCK_BITMAP)
+		xfs_rtbitmap_lock(tp, rtg->rtg_mount);
+	else if (rtglock_flags & XFS_RTGLOCK_BITMAP_SHARED)
+		xfs_rtbitmap_lock_shared(rtg->rtg_mount, XFS_RBMLOCK_BITMAP);
+}
+
+/* Unlock metadata inodes associated with this rt group. */
+void
+xfs_rtgroup_unlock(
+	struct xfs_rtgroup	*rtg,
+	unsigned int		rtglock_flags)
+{
+	ASSERT(!(rtglock_flags & ~XFS_RTGLOCK_ALL_FLAGS));
+	ASSERT(!(rtglock_flags & XFS_RTGLOCK_BITMAP_SHARED) ||
+	       !(rtglock_flags & XFS_RTGLOCK_BITMAP));
+
+	if (rtglock_flags & XFS_RTGLOCK_BITMAP)
+		xfs_rtbitmap_unlock(rtg->rtg_mount);
+	else if (rtglock_flags & XFS_RTGLOCK_BITMAP_SHARED)
+		xfs_rtbitmap_unlock_shared(rtg->rtg_mount, XFS_RBMLOCK_BITMAP);
+}
diff --git a/libxfs/xfs_rtgroup.h b/libxfs/xfs_rtgroup.h
index 0e664e2436b..b1e53af5a65 100644
--- a/libxfs/xfs_rtgroup.h
+++ b/libxfs/xfs_rtgroup.h
@@ -210,11 +210,25 @@  void xfs_rtgroup_update_super(struct xfs_buf *rtsb_bp,
 		const struct xfs_buf *sb_bp);
 void xfs_rtgroup_log_super(struct xfs_trans *tp, const struct xfs_buf *sb_bp);
 int xfs_rtgroup_update_secondary_sbs(struct xfs_mount *mp);
+
+/* Lock the rt bitmap inode in exclusive mode */
+#define XFS_RTGLOCK_BITMAP		(1U << 0)
+/* Lock the rt bitmap inode in shared mode */
+#define XFS_RTGLOCK_BITMAP_SHARED	(1U << 1)
+
+#define XFS_RTGLOCK_ALL_FLAGS	(XFS_RTGLOCK_BITMAP | \
+				 XFS_RTGLOCK_BITMAP_SHARED)
+
+void xfs_rtgroup_lock(struct xfs_trans *tp, struct xfs_rtgroup *rtg,
+		unsigned int rtglock_flags);
+void xfs_rtgroup_unlock(struct xfs_rtgroup *rtg, unsigned int rtglock_flags);
 #else
 # define xfs_rtgroup_block_count(mp, rgno)	(0)
 # define xfs_rtgroup_update_super(bp, sb_bp)	((void)0)
 # define xfs_rtgroup_log_super(tp, sb_bp)	((void)0)
 # define xfs_rtgroup_update_secondary_sbs(mp)	(0)
+# define xfs_rtgroup_lock(tp, rtg, gf)		((void)0)
+# define xfs_rtgroup_unlock(rtg, gf)		((void)0)
 #endif /* CONFIG_XFS_RT */
 
 #endif /* __LIBXFS_RTGROUP_H */