[PATCH 18/27] CacheFiles: Be consistent about the use of mapping vs file->f_mapping in Ext3 [try #2]

Change all the usages of file->f_mapping in ext3_*write_end() functions to use the mapping argument directly. This has two consequences: (*) Consistency. Without this patch sometimes one is used and sometimes the other is. (*) A NULL file pointer can be passed. This feature is then made

[PATCH 18/27] CacheFiles: Be consistent about the use of mapping vs file->f_mapping in Ext3

Change all the usages of file->f_mapping in ext3_*write_end() functions to use the mapping argument directly. This has two consequences: (*) Consistency. Without this patch sometimes one is used and sometimes the other is. (*) A NULL file pointer can be passed. This feature is then made