linux-ext4 - [PATCH 07/10] ext4: misc fast commit fixes

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Message-Id: <20201031200518.4178786-8-harshadshirwadkar@gmail.com>
Date:   Sat, 31 Oct 2020 13:05:15 -0700
From:   Harshad Shirwadkar <harshadshirwadkar@...il.com>
To:     linux-ext4@...r.kernel.org
Cc:     tytso@....edu, jack@...e.cz,
        Harshad Shirwadkar <harshadshirwadkar@...il.com>
Subject: [PATCH 07/10] ext4: misc fast commit fixes

This patch adds a small number of misc fast commit fixes. Along with
functional fixes such as setting the right buffer flags, there also
typo fixes and comment additions.

Suggested-by: Jan Kara <jack@...e.cz>
Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@...il.com>
---
 fs/ext4/ext4_jbd2.h   | 6 +++++-
 fs/ext4/fast_commit.c | 5 +++--
 fs/ext4/file.c        | 2 --
 3 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/fs/ext4/ext4_jbd2.h b/fs/ext4/ext4_jbd2.h
index 00dc668e052b..10855cd230c7 100644
--- a/fs/ext4/ext4_jbd2.h
+++ b/fs/ext4/ext4_jbd2.h
@@ -422,9 +422,13 @@ static inline int ext4_journal_force_commit(journal_t *journal)
 static inline int ext4_jbd2_inode_add_write(handle_t *handle,
 		struct inode *inode, loff_t start_byte, loff_t length)
 {
-	if (ext4_handle_valid(handle))
+	if (ext4_handle_valid(handle)) {
+		ext4_fc_track_range(handle, inode,
+			start_byte >> inode->i_sb->s_blocksize_bits,
+			(start_byte + length) >> inode->i_sb->s_blocksize_bits);
 		return jbd2_journal_inode_ranged_write(handle,
 				EXT4_I(inode)->jinode, start_byte, length);
+	}
 	return 0;
 }
 
diff --git a/fs/ext4/fast_commit.c b/fs/ext4/fast_commit.c
index 0f2543220d1d..b7b1fe6dbb24 100644
--- a/fs/ext4/fast_commit.c
+++ b/fs/ext4/fast_commit.c
@@ -83,7 +83,7 @@
  *
  * Atomicity of commits
  * --------------------
- * In order to gaurantee atomicity during the commit operation, fast commit
+ * In order to guarantee atomicity during the commit operation, fast commit
  * uses "EXT4_FC_TAG_TAIL" tag that marks a fast commit as complete. Tail
  * tag contains CRC of the contents and TID of the transaction after which
  * this fast commit should be applied. Recovery code replays fast commit
@@ -531,10 +531,11 @@ static void ext4_fc_submit_bh(struct super_block *sb)
 	int write_flags = REQ_SYNC;
 	struct buffer_head *bh = EXT4_SB(sb)->s_fc_bh;
 
+	/* TODO: REQ_FUA | REQ_PREFLUSH is unnecessarily expensive. */
 	if (test_opt(sb, BARRIER))
 		write_flags |= REQ_FUA | REQ_PREFLUSH;
 	lock_buffer(bh);
-	clear_buffer_dirty(bh);
+	set_buffer_dirty(bh);
 	set_buffer_uptodate(bh);
 	bh->b_end_io = ext4_end_buffer_io_sync;
 	submit_bh(REQ_OP_WRITE, write_flags, bh);
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index d85412d12e3a..80ad5ccc0288 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -761,7 +761,6 @@ static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma)
 	if (!daxdev_mapping_supported(vma, dax_dev))
 		return -EOPNOTSUPP;
 
-	ext4_fc_start_update(inode);
 	file_accessed(file);
 	if (IS_DAX(file_inode(file))) {
 		vma->vm_ops = &ext4_dax_vm_ops;
@@ -769,7 +768,6 @@ static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma)
 	} else {
 		vma->vm_ops = &ext4_file_vm_ops;
 	}
-	ext4_fc_stop_update(inode);
 	return 0;
 }
 
-- 
2.29.1.341.ge80a0c044ae-goog