From: Theodore Ts'o Subject: [PATCH] ext4: add a new spinlock i_raw_lock to protect the ext4's raw inode Date: Sat, 12 Apr 2014 18:55:14 -0400 Message-ID: <1397343317-14669-1-git-send-email-tytso@mit.edu> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: Ext4 Developers List , Theodore Ts'o To: xfs@oss.sgi.com Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: xfs-bounces@oss.sgi.com Sender: xfs-bounces@oss.sgi.com List-Id: linux-ext4.vger.kernel.org To avoid potential data races, use a spinlock which protects the raw (on-disk) inode. Signed-off-by: "Theodore Ts'o" --- fs/ext4/ext4.h | 2 ++ fs/ext4/inode.c | 5 ++++- fs/ext4/super.c | 1 + 3 files changed, 7 insertions(+), 1 deletion(-) diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 86c2cda..1d08a1b 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -875,6 +875,8 @@ struct ext4_inode_info { struct inode vfs_inode; struct jbd2_inode *jinode; + spinlock_t i_raw_lock; /* protects updates to the raw inode */ + /* * File creation time. Its function is same as that of * struct timespec i_{a,c,m}time in the generic inode. diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 2eb5fad..1ee8ff6 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -4311,7 +4311,9 @@ static int ext4_do_update_inode(handle_t *handle, uid_t i_uid; gid_t i_gid; - /* For fields not not tracking in the in-memory inode, + spin_lock(&ei->i_raw_lock); + + /* For fields not tracked in the in-memory inode, * initialise them to zero for new inodes. */ if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); @@ -4419,6 +4421,7 @@ static int ext4_do_update_inode(handle_t *handle, ext4_update_inode_fsync_trans(handle, inode, need_datasync); out_brelse: + spin_unlock(&ei->i_raw_lock); brelse(bh); ext4_std_error(inode->i_sb, err); return err; diff --git a/fs/ext4/super.c b/fs/ext4/super.c index c4895c1..1f8cb18 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -879,6 +879,7 @@ static struct inode *ext4_alloc_inode(struct super_block *sb) return NULL; ei->vfs_inode.i_version = 1; + spin_lock_init(&ei->i_raw_lock); INIT_LIST_HEAD(&ei->i_prealloc_list); spin_lock_init(&ei->i_prealloc_lock); ext4_es_init_tree(&ei->i_es_tree); -- 1.9.0 _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs