linux-ext4 - [PATCH 26/29] ext4: Remove i_mutex from ext4_file

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Date:	Mon,  8 Apr 2013 23:32:31 +0200
From:	Jan Kara <jack@...e.cz>
To:	Ted Tso <tytso@....edu>
Cc:	linux-ext4@...r.kernel.org, Jan Kara <jack@...e.cz>
Subject: [PATCH 26/29] ext4: Remove i_mutex from ext4_file_sync()

After removal of ext4_flush_unwritten_io() call, ext4_file_sync()
doesn't need i_mutex anymore. Forcing of transaction commits doesn't
need i_mutex as there's nothing inode specific in that code apart from
grabbing transaction ids from the inode. So remove the lock.

Signed-off-by: Jan Kara <jack@...e.cz>
---
 fs/ext4/fsync.c |    6 +-----
 1 files changed, 1 insertions(+), 5 deletions(-)

diff --git a/fs/ext4/fsync.c b/fs/ext4/fsync.c
index 1c08780..9040faa 100644
--- a/fs/ext4/fsync.c
+++ b/fs/ext4/fsync.c
@@ -99,7 +99,7 @@ int ext4_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
 	trace_ext4_sync_file_enter(file, datasync);
 
 	if (inode->i_sb->s_flags & MS_RDONLY)
-		goto out_trace;
+		goto out;
 
 	if (!journal) {
 		ret = generic_file_fsync(file, start, end, datasync);
@@ -111,8 +111,6 @@ int ext4_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
 	ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
 	if (ret)
 		return ret;
-	mutex_lock(&inode->i_mutex);
-
 	/*
 	 * data=writeback,ordered:
 	 *  The caller's filemap_fdatawrite()/wait will sync the data.
@@ -144,8 +142,6 @@ int ext4_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
 			ret = err;
 	}
 out:
-	mutex_unlock(&inode->i_mutex);
-out_trace:
 	trace_ext4_sync_file_exit(inode, ret);
 	return ret;
 }
-- 
1.7.1

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