From mboxrd@z Thu Jan 1 00:00:00 1970 From: Changman Lee Subject: RE: [PATCH 00/16] f2fs: introduce flash-friendly file system Date: Thu, 18 Oct 2012 08:06:32 +0900 Message-ID: <000001cdacbc$0ca68080$25f38180$%lee@samsung.com> References: <415E76CC-A53D-4643-88AB-3D7D7DC56F98@dubeyko.com> <9DE65D03-D4EA-4B32-9C1D-1516EAE50E23@dubeyko.com> <1349553966.12699.132.camel@kjgkr> <50712AAA.5030807@gmail.com> <002201cda46e$88b84d30$9a28e790$%kim@samsung.com> <004101cda52e$72210e20$56632a60$%kim@samsung.com> <55A93BD0-CBCB-4707-A970-EB823EC54B2D@dubeyko.com> <006f01cda5ec$e63e9b60$b2bbd220$%kim@samsung.com> <1349855868.1889.87.camel@slavad-ubuntu> <009f01cda6cb$b8cb1020$2a613060$%kim@samsung.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: 'Jaegeuk Kim' , 'Vyacheslav Dubeyko' , 'Marco Stornelli' , 'Jaegeuk Kim' , 'Al Viro' , tytso@mit.edu, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, chur.lee@samsung.com, jooyoung.hwang@samsung.com, linux-fsdevel@vger.kernel.org To: 'Namjae Jeon' , 'Changman Lee' Return-path: In-reply-to: Content-language: ko Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-fsdevel.vger.kernel.org > -----Original Message----- > From: Namjae Jeon [mailto:linkinjeon@gmail.com] > Sent: Wednesday, October 17, 2012 8:14 PM > To: Changman Lee > Cc: Jaegeuk Kim; Vyacheslav Dubeyko; Marco Stornelli; Jaegeuk Kim; Al= Viro; > tytso@mit.edu; gregkh@linuxfoundation.org; linux-kernel@vger.kernel.o= rg; > chur.lee@samsung.com; cm224.lee@samsung.com; jooyoung.hwang@samsung.c= om; > linux-fsdevel@vger.kernel.org > Subject: Re: [PATCH 00/16] f2fs: introduce flash-friendly file system >=20 > 2012/10/11, Changman Lee : > > 2012=EB=85=84 10=EC=9B=94 11=EC=9D=BC =EB=AA=A9=EC=9A=94=EC=9D=BC=EC= =97=90 Namjae Jeon=EB=8B=98=EC=9D=B4 =EC=9E=91=EC= =84=B1: > >> 2012/10/10 Jaegeuk Kim : > >> > >>>> > >>>> I mean that every volume is placed inside any partition (MTD or = GPT). > > Every partition begins from any > >>>> physical sector. So, as I can understand, f2fs volume can begin = from > > physical sector that is laid > >>>> inside physical erase block. Thereby, in such case of formating = the > > f2fs's operation units will be > >>>> unaligned in relation of physical erase blocks, from my point of= view. > > Maybe, I misunderstand > >>>> something but it can lead to additional FTL operations and perfo= rmance > > degradation, from my point of > >>>> view. > >>> > >>> I think mkfs already calculates the offset to align that. > >> I think this answer is not what he want. > >> If you don't use partition table such as dos partition table or gp= t, I > >> think that it is possible to align using mkfs. > >> But If we should consider partition table space in storage, I don'= t > >> understand how it could be align using mkfs. > >> > >> Thanks. > > > > We can know the physical starting sector address of any partitions = from > > hdio geometry information got by ioctl. > If so, first block and end block of partition are useless ? >=20 > Thanks. =46or example. If we try to align a start point of F2FS in 2MB but start sector of any= partition is not aligned in 2MB, and of course F2FS will have some unused blocks. Instead, F2FS could re= duce gc cost of ftl. I don't know my answer is what you want. > > > >>> Thanks, > >>> > >>> -- > >>> To unsubscribe from this list: send the line "unsubscribe linux-f= sdevel" > > in > >>> the body of a message to majordomo@vger.kernel.org > >>> More majordomo info at http://vger.kernel.org/majordomo-info.htm= l > >> -- > >> To unsubscribe from this list: send the line "unsubscribe linux-ke= rnel" > >> in > >> the body of a message to majordomo@vger.kernel.org > >> More majordomo info at http://vger.kernel.org/majordomo-info.html > >> Please read the FAQ at http://www.tux.org/lkml/ > >> > >