diff options
| -rw-r--r-- | fs/overlayfs/readdir.c | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/fs/overlayfs/readdir.c b/fs/overlayfs/readdir.c index c6787f84ece9..b7d9fb098840 100644 --- a/fs/overlayfs/readdir.c +++ b/fs/overlayfs/readdir.c @@ -458,20 +458,27 @@ static int ovl_dir_fsync(struct file *file, loff_t start, loff_t end, if (!od->is_upper && ovl_path_type(dentry) == OVL_PATH_MERGE) { struct inode *inode = file_inode(file); - mutex_lock(&inode->i_mutex); realfile = od->upperfile; if (!realfile) { struct path upperpath; ovl_path_upper(dentry, &upperpath); realfile = ovl_path_open(&upperpath, O_RDONLY); - if (IS_ERR(realfile)) { - mutex_unlock(&inode->i_mutex); - return PTR_ERR(realfile); + mutex_lock(&inode->i_mutex); + if (!od->upperfile) { + if (IS_ERR(realfile)) { + mutex_unlock(&inode->i_mutex); + return PTR_ERR(realfile); + } + od->upperfile = realfile; + } else { + /* somebody has beaten us to it */ + if (!IS_ERR(realfile)) + fput(realfile); + realfile = od->upperfile; } - od->upperfile = realfile; + mutex_unlock(&inode->i_mutex); } - mutex_unlock(&inode->i_mutex); } return vfs_fsync_range(realfile, start, end, datasync); |