*/
unsigned long j_flags;
+ /**
+ * @j_atomic_flags: Atomic journaling state flags.
+ */
+ unsigned long j_atomic_flags;
+
/**
* @j_errno:
*
*/
struct buffer_head *j_chkpt_bhs[JBD2_NR_BATCH];
+ /**
+ * @j_shrinker:
+ *
+ * Journal head shrinker, reclaim buffer's journal head which
+ * has been written back.
+ */
+ struct shrinker j_shrinker;
+
+ /**
+ * @j_jh_shrink_count:
+ *
+ * Number of journal buffers on the checkpoint list. [j_list_lock]
+ */
+ struct percpu_counter j_jh_shrink_count;
+
+ /**
+ * @j_shrink_transaction:
+ *
+ * Record next transaction will shrink on the checkpoint list.
+ * [j_list_lock]
+ */
+ transaction_t *j_shrink_transaction;
+
/**
* @j_head:
*
* mode */
#define JBD2_FAST_COMMIT_ONGOING 0x100 /* Fast commit is ongoing */
#define JBD2_FULL_COMMIT_ONGOING 0x200 /* Full commit is ongoing */
+#define JBD2_JOURNAL_FLUSH_DISCARD 0x0001
+#define JBD2_JOURNAL_FLUSH_ZEROOUT 0x0002
+#define JBD2_JOURNAL_FLUSH_VALID (JBD2_JOURNAL_FLUSH_DISCARD | \
+ JBD2_JOURNAL_FLUSH_ZEROOUT)
+
+/*
+ * Journal atomic flag definitions
+ */
+#define JBD2_CHECKPOINT_IO_ERROR 0x001 /* Detect io error while writing
+ * buffer back to disk */
/*
* Function declarations for the journaling transaction and buffer
/* Checkpoint list management */
void __jbd2_journal_clean_checkpoint_list(journal_t *journal, bool destroy);
+unsigned long jbd2_journal_shrink_checkpoint_list(journal_t *journal, unsigned long *nr_to_scan);
int __jbd2_journal_remove_checkpoint(struct journal_head *);
void jbd2_journal_destroy_checkpoint(journal_t *journal);
void __jbd2_journal_insert_checkpoint(struct journal_head *, transaction_t *);
struct page *, unsigned int, unsigned int);
extern int jbd2_journal_try_to_free_buffers(journal_t *journal, struct page *page);
extern int jbd2_journal_stop(handle_t *);
-extern int jbd2_journal_flush (journal_t *);
+extern int jbd2_journal_flush(journal_t *journal, unsigned int flags);
extern void jbd2_journal_lock_updates (journal_t *);
extern void jbd2_journal_unlock_updates (journal_t *);
(journal_t *, unsigned long, unsigned long, unsigned long);
extern void jbd2_journal_clear_features
(journal_t *, unsigned long, unsigned long, unsigned long);
+extern int jbd2_journal_register_shrinker(journal_t *journal);
+extern void jbd2_journal_unregister_shrinker(journal_t *journal);
extern int jbd2_journal_load (journal_t *journal);
extern int jbd2_journal_destroy (journal_t *);
extern int jbd2_journal_recover (journal_t *journal);