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jbd2: remove journal_head from descriptor buffers

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Similarly as for metadata buffers, also log descriptor buffers don't
really need the journal head. So strip it and remove BJ_LogCtl list.

Reviewed-by: Zheng Liu <wenqing.lz@taobao.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Jan Kara
2013-06-04 12:06:01 -04:00
committed by Theodore Ts'o
parent f5113effc2
commit e5a120aeb5
6 changed files with 64 additions and 93 deletions
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include/linux/jbd2.h
+7 -12
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@@ -530,12 +530,6 @@ struct transaction_s
*/
struct journal_head *t_shadow_list;
/*
* Doubly-linked circular list of control buffers being written to the
* log. [j_list_lock]
*/
struct journal_head *t_log_list;
/*
* List of inodes whose data we've modified in data=ordered mode.
* [j_list_lock]
@@ -995,7 +989,7 @@ static inline void jbd2_unfile_log_bh(struct buffer_head *bh)
}
/* Log buffer allocation */
extern struct journal_head * jbd2_journal_get_descriptor_buffer(journal_t *);
struct buffer_head *jbd2_journal_get_descriptor_buffer(journal_t *journal);
int jbd2_journal_next_log_block(journal_t *, unsigned long long *);
int jbd2_journal_get_log_tail(journal_t *journal, tid_t *tid,
unsigned long *block);
@@ -1179,8 +1173,10 @@ extern int jbd2_journal_init_revoke_caches(void);
extern void jbd2_journal_destroy_revoke(journal_t *);
extern int jbd2_journal_revoke (handle_t *, unsigned long long, struct buffer_head *);
extern int jbd2_journal_cancel_revoke(handle_t *, struct journal_head *);
extern void jbd2_journal_write_revoke_records(journal_t *,
transaction_t *, int);
extern void jbd2_journal_write_revoke_records(journal_t *journal,
transaction_t *transaction,
struct list_head *log_bufs,
int write_op);
/* Recovery revoke support */
extern int jbd2_journal_set_revoke(journal_t *, unsigned long long, tid_t);
@@ -1288,9 +1284,8 @@ static inline int jbd_space_needed(journal_t *journal)
#define BJ_Metadata 1 /* Normal journaled metadata */
#define BJ_Forget 2 /* Buffer superseded by this transaction */
#define BJ_Shadow 3 /* Buffer contents being shadowed to the log */
#define BJ_LogCtl 4 /* Buffer contains log descriptors */
#define BJ_Reserved 5 /* Buffer is reserved for access by journal */
#define BJ_Types 6
#define BJ_Reserved 4 /* Buffer is reserved for access by journal */
#define BJ_Types 5
extern int jbd_blocks_per_page(struct inode *inode);