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Mon, 20 Apr 2020 06:57:52 -0700 (PDT) From: Emanuele Giuseppe Esposito Subject: Re: [PATCH 6/8] simplefs: add file creation functions To: Greg Kroah-Hartman References: <20200414124304.4470-1-eesposit@redhat.com> <20200414124304.4470-7-eesposit@redhat.com> <20200414125626.GC720679@kroah.com> Message-ID: Date: Mon, 20 Apr 2020 15:57:48 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.6.0 MIME-Version: 1.0 In-Reply-To: <20200414125626.GC720679@kroah.com> Content-Language: en-US X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit X-Mailman-Approved-At: Tue, 21 Apr 2020 03:37:26 +1000 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Song Liu , linux-usb@vger.kernel.org, bpf@vger.kernel.org, "Rafael J. Wysocki" , David Airlie , Heiko Carstens , Alexei Starovoitov , dri-devel@lists.freedesktop.org, "J. Bruce Fields" , Joseph Qi , Hugh Dickins , Paul Mackerras , John Johansen , netdev@vger.kernel.org, ocfs2-devel@oss.oracle.com, Christoph Hellwig , Andrew Donnellan , Matthew Garrett , linux-efi@vger.kernel.org, Arnd Bergmann , Daniel Borkmann , Christian Borntraeger , linux-rdma@vger.kernel.org, Mark Fasheh , Anton Vorontsov , John Fastabend , James Morris , Ard Biesheuvel , Jason Gunthorpe , Doug Ledford , oprofile-list@lists.sf.net, Yonghong Song , Ian Kent , Andrii Nakryiko , Alexey Dobriyan , "Serge E. Hallyn" , Robert Richter , Thomas Zimmermann , Vasily Gorbik , Tony Luck , Kees Cook , "James E.J. Bottomley" , autofs@vger.kernel.org, Maarten Lankhorst , Mike Marciniszyn , Maxime Ripard , linux-fsdevel@vger.kernel.org, "Manoj N. Kumar" , Uma Krishnan , Jakub Kicinski , KP Singh , Trond Myklebust , "Matthew R. Ochs" , "David S. Miller" , Felipe Balbi , linux-nfs@vger.kernel.org, Iurii Zaikin , linux-scsi@vger.kernel.org, "Martin K. Petersen" , linux-mm@kvack.org, linux-s390@vger.kernel.org, Dennis Dalessandro , Miklos Szeredi , linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, Anna Schumaker , Luis Chamberlain , Chuck Lever , Jeremy Kerr , Daniel Vetter , Colin Cross , Frederic Barrat , Paolo Bonzini , Andrew Morton , Mike Kravetz , linuxppc-dev@lists.ozlabs.org, Martin KaFai Lau , Joel Becker , Alexander Viro Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" 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 >> --- >> 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