linux-ext4 - Re: Pretty-printing file.f_mode and file.f

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Date:	Fri, 11 Apr 2014 18:47:52 -0400
From:	Trond Myklebust <trond.myklebust@...marydata.com>
To:	Theodore Ts'o <tytso@....edu>
Cc:	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
	rostedt@...dmis.org
Subject: Re: Pretty-printing file.f_mode and file.f_flags in trace points

Hi Ted,

On Apr 11, 2014, at 18:32, Theodore Ts'o <tytso@....edu> wrote:

> 
> I want to add some trace points which display f_mode and f_flags from
> struct file in a human way.   I found the following handy macros defined
> in fs/nfs/nfstrace.h:
> 
> #define show_open_flags(flags) \
> 	__print_flags((unsigned long)flags, "|", \
> 		{ O_CREAT, "O_CREAT" }, \
> 		{ O_EXCL, "O_EXCL" }, \
> 		{ O_TRUNC, "O_TRUNC" }, \
> 		{ O_APPEND, "O_APPEND" }, \
> 		{ O_DSYNC, "O_DSYNC" }, \
> 		{ O_DIRECT, "O_DIRECT" }, \
> 		{ O_DIRECTORY, "O_DIRECTORY" })
> 
> #define show_fmode_flags(mode) \
> 	__print_flags(mode, "|", \
> 		{ ((__force unsigned long)FMODE_READ), "READ" }, \
> 		{ ((__force unsigned long)FMODE_WRITE), "WRITE" }, \
> 		{ ((__force unsigned long)FMODE_EXEC), "EXEC" })
> 
> I could just cut and paste these and drop them in
> include/trace/events/ext4.h, but it would probably be better to have a
> common header file.  The question is where to put them.  Does
> include/trace/fs.h make sense to everyone?   Or should put them
> somewhere else, such as linux/fs.h?

I’d vote for creating a new file, rather than reusing include/linux/fs.h. The latter is included in way too many other headers... 

include/trace/fs.h sounds just fine to me if Steven and the other tracepoint gurus are OK with it.

Cheers
  Trond
_________________________________
Trond Myklebust
Linux NFS client maintainer, PrimaryData
trond.myklebust@...marydata.com

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