linux-ext4 - [PATCH v3 6/6] ext4: update code documentation

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Message-Id: <20220419173143.3564144-7-harshads@google.com>
Date:   Tue, 19 Apr 2022 10:31:43 -0700
From:   Harshad Shirwadkar <harshadshirwadkar@...il.com>
To:     linux-ext4@...r.kernel.org
Cc:     riteshh@...ux.ibm.com, jack@...e.cz, tytso@....edu,
        Harshad Shirwadkar <harshadshirwadkar@...il.com>
Subject: [PATCH v3 6/6] ext4: update code documentation

From: Harshad Shirwadkar <harshadshirwadkar@...il.com>

This patch updates code documentation to reflect the commit path changes
made in this series.

Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@...il.com>
Reviewed-by: Jan Kara <jack@...e.cz>
---
 fs/ext4/fast_commit.c | 39 ++++++++++++++++++++++++++-------------
 1 file changed, 26 insertions(+), 13 deletions(-)

diff --git a/fs/ext4/fast_commit.c b/fs/ext4/fast_commit.c
index 266c95ff0d74..1691cfd89954 100644
--- a/fs/ext4/fast_commit.c
+++ b/fs/ext4/fast_commit.c
@@ -49,14 +49,21 @@
  * that need to be committed during a fast commit in another in memory queue of
  * inodes. During the commit operation, we commit in the following order:
  *
- * [1] Lock inodes for any further data updates by setting COMMITTING state
- * [2] Submit data buffers of all the inodes
- * [3] Wait for [2] to complete
- * [4] Commit all the directory entry updates in the fast commit space
- * [5] Commit all the changed inode structures
- * [6] Write tail tag (this tag ensures the atomicity, please read the following
+ * [1] Lock the journal by calling jbd2_journal_lock_updates. This ensures that
+ *     all the exsiting handles finish and no new handles can start.
+ * [2] Mark all the fast commit eligible inodes as undergoing fast commit
+ *     by setting "EXT4_STATE_FC_COMMITTING" state.
+ * [3] Unlock the journal by calling jbd2_journal_unlock_updates. This allows
+ *     starting of new handles. If new handles try to start an update on
+ *     any of the inodes that are being committed, ext4_fc_track_inode()
+ *     will block until those inodes have finished the fast commit.
+ * [4] Submit data buffers of all the committing inodes.
+ * [5] Wait for [4] to complete.
+ * [6] Commit all the directory entry updates in the fast commit space.
+ * [7] Commit all the changed inodes in the fast commit space and clear
+ *     "EXT4_STATE_FC_COMMITTING" for these inodes.
+ * [8] Write tail tag (this tag ensures the atomicity, please read the following
  *     section for more details).
- * [7] Wait for [4], [5] and [6] to complete.
  *
  * All the inode updates must call ext4_fc_start_update() before starting an
  * update. If such an ongoing update is present, fast commit waits for it to
@@ -142,6 +149,13 @@
  * similarly. Thus, by converting a non-idempotent procedure into a series of
  * idempotent outcomes, fast commits ensured idempotence during the replay.
  *
+ * Locking
+ * -------
+ * sbi->s_fc_lock protects the fast commit inodes queue and the fast commit
+ * dentry queue. ei->i_fc_lock protects the fast commit related info in a given
+ * inode. Most of the code avoids acquiring both the locks, but if one must do
+ * that then sbi->s_fc_lock must be acquired before ei->i_fc_lock.
+ *
  * TODOs
  * -----
  *
@@ -156,13 +170,12 @@
  *    fast commit recovery even if that area is invalidated by later full
  *    commits.
  *
- * 1) Fast commit's commit path locks the entire file system during fast
- *    commit. This has significant performance penalty. Instead of that, we
- *    should use ext4_fc_start/stop_update functions to start inode level
- *    updates from ext4_journal_start/stop. Once we do that we can drop file
- *    system locking during commit path.
+ * 1) Handle more ineligible cases.
  *
- * 2) Handle more ineligible cases.
+ * 2) Change ext4_fc_commit() to lookup logical to physical mapping using extent
+ *    status tree. This would get rid of the need to call ext4_fc_track_inode()
+ *    before acquiring i_data_sem. To do that we would need to ensure that
+ *    modified extents from the extent status tree are not evicted from memory.
  */
 
 #include <trace/events/ext4.h>
-- 
2.36.0.rc0.470.gd361397f0d-goog