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authorHarshad Shirwadkar <harshadshirwadkar@gmail.com>2020-11-06 06:58:57 +0300
committerTheodore Ts'o <tytso@mit.edu>2020-11-07 07:01:03 +0300
commitc460e5edc85a063ec9cb60addff93d00ed378701 (patch)
treea779fd93ebec507ce8c177c781ce2c7cde1716e2 /include
parent37e0a30e94f1aa25f16b403dfabb64e0b806de0b (diff)
downloadlinux-c460e5edc85a063ec9cb60addff93d00ed378701.tar.xz
jbd2: don't use state lock during commit path
Variables journal->j_fc_off, journal->j_fc_wbuf are accessed during commit path. Since today we allow only one process to perform a fast commit, there is no need take state lock before accessing these variables. This patch removes these locks and adds comments to describe this. Suggested-by: Jan Kara <jack@suse.cz> Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Link: https://lore.kernel.org/r/20201106035911.1942128-9-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'include')
-rw-r--r--include/linux/jbd2.h10
1 files changed, 6 insertions, 4 deletions
diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h
index b2caf7bbd8e5..5f0ef6380b0c 100644
--- a/include/linux/jbd2.h
+++ b/include/linux/jbd2.h
@@ -945,8 +945,9 @@ struct journal_s
/**
* @j_fc_off:
*
- * Number of fast commit blocks currently allocated.
- * [j_state_lock].
+ * Number of fast commit blocks currently allocated. Accessed only
+ * during fast commit. Currently only process can do fast commit, so
+ * this field is not protected by any lock.
*/
unsigned long j_fc_off;
@@ -1109,8 +1110,9 @@ struct journal_s
struct buffer_head **j_wbuf;
/**
- * @j_fc_wbuf: Array of fast commit bhs for
- * jbd2_journal_commit_transaction.
+ * @j_fc_wbuf: Array of fast commit bhs for fast commit. Accessed only
+ * during a fast commit. Currently only process can do fast commit, so
+ * this field is not protected by any lock.
*/
struct buffer_head **j_fc_wbuf;