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X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: svJNhYS0TMI49d7RH3t8CMHegx5QllTXq7JW1W9ZMIWveuiUlMWnDenGmeXzwaiJEN5poeZiBSxOOS4lNbLRHw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA3PR10MB8041 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1093,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-03-20_03,2025-03-19_01,2024-11-22_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 malwarescore=0 mlxlogscore=999 suspectscore=0 spamscore=0 bulkscore=0 mlxscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2502280000 definitions=main-2503200056 X-Proofpoint-GUID: lNfLBavpI6nn0xhB4DJgwpfHecWVwhap X-Proofpoint-ORIG-GUID: lNfLBavpI6nn0xhB4DJgwpfHecWVwhap On 20/03/2025 07:00, Christoph Hellwig wrote: > On Wed, Mar 19, 2025 at 11:44:02AM +0000, John Garry wrote: >> XFS supports atomic writes - or untorn writes - based on different methods: >> - HW offload in the disk >> - Software emulation >> >> The value reported in stx_atomic_write_unit_max will be the max of the >> software emulation method. > > I don't think emulation is a good word. A file system implementing > file systems things is not emulation. Sure, I am still in the mindset that a filesystem-based atomic write is a 2nd-class citizen and just trying to emulate what can be done in the disk. > >> We want STATX_WRITE_ATOMIC to get this new member in addition to the >> already-existing members, so mention that a value of 0 means that >> stx_atomic_write_unit_max holds this limit. > > Does that actually work? Can userspace assume all unknown statx > fields are padded to zero? If so my dio read align change could have > done away with the extra flag. I will double check that, but if we needed to add another mask just for getting this, then yuck. > > But is there value in reporting this limit? I am not sure. I am not sure what the user would do with this info. Maybe, for example, they want to write 1K consecutive 16K pages, each atomically, and decide to do a big 16M atomic write but find that it is slow as bdev atomic limit is < 16M. Maybe I should just update the documentation to mention that for XFS they should check the mounted bdev atomic limits.