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ext4 / jbd2: add fast commit initialization

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This patch adds fast commit area trackers in the journal_t
structure. These are initialized via the jbd2_fc_init() routine that
this patch adds. This patch also adds ext4/fast_commit.c and
ext4/fast_commit.h files for fast commit code that will be added in
subsequent patches in this series.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com>
Link: https://lore.kernel.org/r/20201015203802.3597742-4-harshadshirwadkar@gmail.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Harshad Shirwadkar
2020-10-15 13:37:55 -07:00
committed by Theodore Ts'o
parent 995a3ed67f
commit 6866d7b3f2
7 changed files with 122 additions and 6 deletions
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39
include/linux/jbd2.h
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@@ -918,6 +918,30 @@ struct journal_s
*/
unsigned long j_last;
/**
* @j_fc_first:
*
* The block number of the first fast commit block in the journal
* [j_state_lock].
*/
unsigned long j_fc_first;
/**
* @j_fc_off:
*
* Number of fast commit blocks currently allocated.
* [j_state_lock].
*/
unsigned long j_fc_off;
/**
* @j_fc_last:
*
* The block number one beyond the last fast commit block in the journal
* [j_state_lock].
*/
unsigned long j_fc_last;
/**
* @j_dev: Device where we store the journal.
*/
@@ -1068,6 +1092,12 @@ struct journal_s
*/
struct buffer_head **j_wbuf;
/**
* @j_fc_wbuf: Array of fast commit bhs for
* jbd2_journal_commit_transaction.
*/
struct buffer_head **j_fc_wbuf;
/**
* @j_wbufsize:
*
@@ -1075,6 +1105,13 @@ struct journal_s
*/
int j_wbufsize;
/**
* @j_fc_wbufsize:
*
* Size of @j_fc_wbuf array.
*/
int j_fc_wbufsize;
/**
* @j_last_sync_writer:
*
@@ -1535,6 +1572,8 @@ void __jbd2_log_wait_for_space(journal_t *journal);
extern void __jbd2_journal_drop_transaction(journal_t *, transaction_t *);
extern int jbd2_cleanup_journal_tail(journal_t *);
/* Fast commit related APIs */
int jbd2_fc_init(journal_t *journal, int num_fc_blks);
/*
* is_journal_abort
*