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From: Harshad Shirwadkar <harshadshirwadkar@gmail.com>
To: linux-ext4@vger.kernel.org
Cc: tytso@mit.edu,
	saukad@google.com,
	harshads@google.com,
	Harshad Shirwadkar <harshadshirwadkar@gmail.com>,
	Jan Kara <jack@suse.cz>
Subject: [PATCH v6 05/10] ext4: drop i_fc_updates from inode fc info
Date: Wed, 29 May 2024 01:19:58 +0000
Message-ID: <20240529012003.4006535-6-harshadshirwadkar@gmail.com>
In-Reply-To: <20240529012003.4006535-1-harshadshirwadkar@gmail.com>
References: <20240529012003.4006535-1-harshadshirwadkar@gmail.com>
Precedence: bulk
MIME-Version: 1.0
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The new logic introduced in this series does not require tracking number
of active handles open on an inode. So, drop it.

Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com>
Reviewed-by: Jan Kara <jack@suse.cz>
---
 fs/ext4/ext4.h        |  5 ----
 fs/ext4/fast_commit.c | 68 -------------------------------------------
 2 files changed, 73 deletions(-)

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 611b8c80d99c..d802040e94df 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1056,9 +1056,6 @@ struct ext4_inode_info {
 	/* End of lblk range that needs to be committed in this fast commit */
 	ext4_lblk_t i_fc_lblk_len;
 
-	/* Number of ongoing updates on this inode */
-	atomic_t  i_fc_updates;
-
 	/* Fast commit wait queue for this inode */
 	wait_queue_head_t i_fc_wait;
 
@@ -2903,8 +2900,6 @@ void __ext4_fc_track_create(handle_t *handle, struct inode *inode,
 void ext4_fc_track_create(handle_t *handle, struct dentry *dentry);
 void ext4_fc_track_inode(handle_t *handle, struct inode *inode);
 void ext4_fc_mark_ineligible(struct super_block *sb, int reason, handle_t *handle);
-void ext4_fc_start_update(struct inode *inode);
-void ext4_fc_stop_update(struct inode *inode);
 void ext4_fc_del(struct inode *inode);
 bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block);
 void ext4_fc_replay_cleanup(struct super_block *sb);
diff --git a/fs/ext4/fast_commit.c b/fs/ext4/fast_commit.c
index 3aca5b20aac5..ecbbcaf78598 100644
--- a/fs/ext4/fast_commit.c
+++ b/fs/ext4/fast_commit.c
@@ -201,32 +201,6 @@ void ext4_fc_init_inode(struct inode *inode)
 	INIT_LIST_HEAD(&ei->i_fc_list);
 	INIT_LIST_HEAD(&ei->i_fc_dilist);
 	init_waitqueue_head(&ei->i_fc_wait);
-	atomic_set(&ei->i_fc_updates, 0);
-}
-
-/* This function must be called with sbi->s_fc_lock held. */
-static void ext4_fc_wait_committing_inode(struct inode *inode)
-__releases(&EXT4_SB(inode->i_sb)->s_fc_lock)
-{
-	wait_queue_head_t *wq;
-	struct ext4_inode_info *ei = EXT4_I(inode);
-
-#if (BITS_PER_LONG < 64)
-	DEFINE_WAIT_BIT(wait, &ei->i_state_flags,
-			EXT4_STATE_FC_COMMITTING);
-	wq = bit_waitqueue(&ei->i_state_flags,
-				EXT4_STATE_FC_COMMITTING);
-#else
-	DEFINE_WAIT_BIT(wait, &ei->i_flags,
-			EXT4_STATE_FC_COMMITTING);
-	wq = bit_waitqueue(&ei->i_flags,
-				EXT4_STATE_FC_COMMITTING);
-#endif
-	lockdep_assert_held(&EXT4_SB(inode->i_sb)->s_fc_lock);
-	prepare_to_wait(wq, &wait.wq_entry, TASK_UNINTERRUPTIBLE);
-	spin_unlock(&EXT4_SB(inode->i_sb)->s_fc_lock);
-	schedule();
-	finish_wait(wq, &wait.wq_entry);
 }
 
 static bool ext4_fc_disabled(struct super_block *sb)
@@ -235,48 +209,6 @@ static bool ext4_fc_disabled(struct super_block *sb)
 		(EXT4_SB(sb)->s_mount_state & EXT4_FC_REPLAY));
 }
 
-/*
- * Inform Ext4's fast about start of an inode update
- *
- * This function is called by the high level call VFS callbacks before
- * performing any inode update. This function blocks if there's an ongoing
- * fast commit on the inode in question.
- */
-void ext4_fc_start_update(struct inode *inode)
-{
-	struct ext4_inode_info *ei = EXT4_I(inode);
-
-	if (ext4_fc_disabled(inode->i_sb))
-		return;
-
-restart:
-	spin_lock(&EXT4_SB(inode->i_sb)->s_fc_lock);
-	if (list_empty(&ei->i_fc_list))
-		goto out;
-
-	if (ext4_test_inode_state(inode, EXT4_STATE_FC_COMMITTING)) {
-		ext4_fc_wait_committing_inode(inode);
-		goto restart;
-	}
-out:
-	atomic_inc(&ei->i_fc_updates);
-	spin_unlock(&EXT4_SB(inode->i_sb)->s_fc_lock);
-}
-
-/*
- * Stop inode update and wake up waiting fast commits if any.
- */
-void ext4_fc_stop_update(struct inode *inode)
-{
-	struct ext4_inode_info *ei = EXT4_I(inode);
-
-	if (ext4_fc_disabled(inode->i_sb))
-		return;
-
-	if (atomic_dec_and_test(&ei->i_fc_updates))
-		wake_up_all(&ei->i_fc_wait);
-}
-
 /*
  * Remove inode from fast commit list. If the inode is being committed
  * we wait until inode commit is done.
-- 
2.45.1.288.g0e0cd299f1-goog