Re: [PATCH 6/8] simplefs: add file creation functions

[Emanuele Giuseppe Esposito <eesposit@redhat.com>]

On 4/14/20 2:56 PM, Greg Kroah-Hartman wrote:
> On Tue, Apr 14, 2020 at 02:43:00PM +0200, Emanuele Giuseppe Esposito wrote:
>> A bunch of code is duplicated between debugfs and tracefs, unify it to the
>> simplefs library.
>>
>> The code is very similar, except that dentry and inode creation are unified
>> into a single function (unlike start_creating in debugfs and tracefs, which
>> only takes care of dentries).  This adds an output parameter to the creation
>> functions, but pushes all error recovery into fs/simplefs.c.
>>
>> Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
>> ---
>>   fs/simplefs.c            | 150 +++++++++++++++++++++++++++++++++++++++
>>   include/linux/simplefs.h |  19 +++++
>>   2 files changed, 169 insertions(+)
> 
> What's wrong with libfs, isn't that supposed to be for these types of
> "common" filesystem interactions?
> 
> Why create a whole "new" fs for this?

I assume you meant a new file. These new functions are used only by a 
few filesystems, and I didn't want to include them in vmlinux 
unconditionally, so I introduced simplefs.c and CONFIG_SIMPLEFS instead 
of extending libfs.c. In this way only fs that need this code like 
debugfs and tracefs will load it.

Thank you,

Emanuele