Signed-off-by: Ivan Shapovalov <intelfx100@xxxxxxxxx>
---
fs/reiser4/txnmgr.c | 24 ++++++++++++++++++++++++
fs/reiser4/txnmgr.h | 2 ++
2 files changed, 26 insertions(+)
diff --git a/fs/reiser4/txnmgr.c b/fs/reiser4/txnmgr.c
index 68070a9..2862940 100644
--- a/fs/reiser4/txnmgr.c
+++ b/fs/reiser4/txnmgr.c
@@ -2050,6 +2050,30 @@ int reiser4_try_capture(jnode *node, znode_lock_mode lock_mode,
return ret;
}
+/* This function ensures that the current transcrash has an atom without
+ * capturing anything. If needed, an empty atom is created and assigned.
+ */
+int reiser4_create_atom(void)
+{
+ txn_atom *atom_alloc = NULL;
+ txn_handle *txnh = get_current_context()->trans;
+ int ret;
+
+ do {
+ spin_lock_txnh(txnh);
+ if (txnh->atom == NULL) {
+ spin_unlock_txnh(txnh);
+ /* assign empty atom to the txnh and repeat */
+ ret = atom_begin_and_assign_to_txnh(&atom_alloc, txnh);
+ } else {
+ spin_unlock_txnh(txnh);
+ ret = 0;
+ }
+ } while (ret == -E_REPEAT);
+
+ return ret;
+}
+
static void release_two_atoms(txn_atom *one, txn_atom *two)
{
spin_unlock_atom(one);
diff --git a/fs/reiser4/txnmgr.h b/fs/reiser4/txnmgr.h
index 72b84a2..50a1f54 100644
--- a/fs/reiser4/txnmgr.h
+++ b/fs/reiser4/txnmgr.h
@@ -437,6 +437,8 @@ extern void reiser4_uncapture_jnode(jnode *);
extern int reiser4_capture_inode(struct inode *);
extern int reiser4_uncapture_inode(struct inode *);
+extern int reiser4_create_atom(void);
+
extern txn_atom *get_current_atom_locked_nocheck(void);
#if REISER4_DEBUG
--
2.1.3
--
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