Implement a quick hack to abuse the superblock freeze mechanism to
freeze the XFS transaction subsystem.
XXX: to be replaced
Not-Signed-off-by: Brian Foster <bfoster@xxxxxxxxxx>
---
fs/xfs/xfs_trans.c | 16 ++++++++++++++++
fs/xfs/xfs_trans.h | 2 ++
2 files changed, 18 insertions(+)
diff --git a/fs/xfs/xfs_trans.c b/fs/xfs/xfs_trans.c
index ca18a040336a..5cb9cb44e963 100644
--- a/fs/xfs/xfs_trans.c
+++ b/fs/xfs/xfs_trans.c
@@ -1024,3 +1024,19 @@ xfs_trans_roll(
tres.tr_logflags = XFS_TRANS_PERM_LOG_RES;
return xfs_trans_reserve(*tpp, &tres, 0, 0);
}
+
+void
+xfs_trans_freeze(
+ struct xfs_mount *mp)
+{
+ struct super_block *sb = mp->m_super;
+ percpu_down_write(sb->s_writers.rw_sem + SB_FREEZE_WRITE-1);
+}
+
+void
+xfs_trans_unfreeze(
+ struct xfs_mount *mp)
+{
+ struct super_block *sb = mp->m_super;
+ percpu_up_write(sb->s_writers.rw_sem + SB_FREEZE_WRITE-1);
+}
diff --git a/fs/xfs/xfs_trans.h b/fs/xfs/xfs_trans.h
index f46534b75236..ec1d5a5c2610 100644
--- a/fs/xfs/xfs_trans.h
+++ b/fs/xfs/xfs_trans.h
@@ -233,6 +233,8 @@ int xfs_trans_commit(struct xfs_trans *);
int xfs_trans_roll(struct xfs_trans **);
int xfs_trans_roll_inode(struct xfs_trans **, struct xfs_inode *);
void xfs_trans_cancel(xfs_trans_t *);
+void xfs_trans_freeze(struct xfs_mount *);
+void xfs_trans_unfreeze(struct xfs_mount *);
int xfs_trans_ail_init(struct xfs_mount *);
void xfs_trans_ail_destroy(struct xfs_mount *);
--
2.25.4
