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charset="utf-8" Content-ID: <6910E58D8DBA0C41B96B6889FD040FD5@namprd15.prod.outlook.com> Content-Transfer-Encoding: quoted-printable Precedence: bulk X-Mailing-List: rust-for-linux@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Subject: RE: [RFC] Should we consider to re-write HFS/HFS+ in Rust? X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.0.736,FMLib:17.12.80.40 definitions=2025-06-20_07,2025-06-20_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 mlxscore=0 impostorscore=0 phishscore=0 clxscore=1015 malwarescore=0 priorityscore=1501 spamscore=0 mlxlogscore=796 suspectscore=0 bulkscore=0 adultscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=2 engine=8.19.0-2505280000 definitions=main-2506200125 On Fri, 2025-06-20 at 10:17 +0200, Miguel Ojeda wrote: > On Thu, Jun 19, 2025 at 11:49=E2=80=AFPM Viacheslav Dubeyko > wrote: > >=20 > > But I would like to implement the step-by-step approach. >=20 > Like Benno mentions, it is hard to say how it will look with your > description, i.e. how you plan to "cut" things. >=20 > On one hand, it sounds like you don't plan to write VFS abstractions > -- did you check Wedson's work? >=20 I don't have plans to re-write the whole Linux kernel. :) Because, any particular file system driver needs to interact with VFS, memory subsystem = and block layer. So, pure Rust implementation means that everything should be r= e- written in Rust. But it's mission impossible any time soon. :) > https://lore.kernel.org/rust-for-linux/20240514131711.379322-1-wedson= af@gmail.com/ =20 >=20 > i.e. it sounds like you want to replace parts of e.g. HFS with Rust > code while still going through C interfaces at some places inside HFS, > and that has downsides. > On the other hand, you mention "abstractions" around VFS concepts too, > so you may have something else in mind. >=20 I am considering of re-writing HFS/HFS+ in Rust but still surviving in the C implemented environment. I don't think that even VFS will be completely re- written in Rust and adopted any time soon. So, I am talking only about HFS/= HFS+ "abstractions" now. > > Frankly speaking, I don't see how Read-Only version can be easier. :) B= ecause, > > even Read-Only version requires to operate by file system's metadata. A= nd it's > > around 80% - 90% of the whole file system driver functionality. From my= point of > > view, it is much easier to convert every metadata structure implementat= ion step > > by step into Rust. >=20 > Well, apart from having to write more operations/code, as soon as > there may be writers, you have to take care of that possibility in > everything you do, no? >=20 > Worst of all, I imagine you have to test (and generally treat the > project) way more carefully, because now your users could lose real > data. >=20 >=20 Even if you have bugs in read path only, then end user will not have access= to data. As a result, end-user will think that data is lost anyway because the= data cannot be accessed. Any modification or bug fix in file system driver could result in real data= loss even for C implementation. So, of course, we need to be really careful with= re- writing file system driver in Rust. But if we have valid implementation in C then we need to follow the functional logic and make the Rust implementation consistent with logic in C. Also, we have xfstests that can help to check t= hat functionality works correctly. Of course, xfstests cannot guarantee 100% correctness of file system operations. So, frankly speaking, I don't see big difference between Read-Only or Read-= Write functionality. Because, both functionalities should be correct and could re= sult in inconsistent state of file system's in-core metadata or what end-user can access or see, finally. Also, anyway, C implementation and Rust implementation needs to co-exist, at minimum, for some time, I assume. Thanks, Slava.