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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: N6VmiB3Tllvdu/rgVcKM/7Pqq6ZC4g3ODzFogXmfoPA+R1EGmEtChNqZ4DcC7GRCGefZ205b8aqCihL4f8K15g== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY8PR10MB6708 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1057,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-02-07_05,2025-02-07_02,2024-11-22_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 phishscore=0 bulkscore=0 mlxlogscore=999 adultscore=0 suspectscore=0 mlxscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2501170000 definitions=main-2502070092 X-Proofpoint-ORIG-GUID: BicUOa2nJgSSWFI2vsz0_Kp5e3WamTCk X-Proofpoint-GUID: BicUOa2nJgSSWFI2vsz0_Kp5e3WamTCk > Yes, bigalloc is indeed good enough as a start but yes eventually > something like forcealign will be beneficial as not everyone prefers an > FS-wide cluster-size allocation granularity. > > We do have a patch for atomic writes with bigalloc that was sent way > back in mid 2024 but then we went into the same discussion of mixed > mapping[1]. > > Hmm I think it might be time to revisit that and see if we can do > something better there. > > [1] https://urldefense.com/v3/__https://lore.kernel.org/linux-ext4/37baa9f4c6c2994df7383d8b719078a527e521b9.1729825985.git.ritesh.list@gmail.com/__;!!ACWV5N9M2RV99hQ!OJKieZJEIvc-M87u_dxAxiEGC4zN0PQmfdLT6k73Y7_Lvr9m-iodyrytRCFxDPbVzsOlk-1kuXXvaKLA-y9kCQ$ Feel free to pick up the iomap patches I had for zeroing when trying to atomic write mixed mappings - that's in my v3 series IIRC. But you might still get some push back on them... >> >>> >>>>> I agree that forcealign is not the only way we can have atomic writes >>>>> work but I do feel there is value in having forcealign for FSes and >>>>> hence we should have a discussion around it so we can get the interface >>>>> right. >>>>> >>>> I thought that the interface for forcealign according to the candidate xfs >>>> implementation was quite straightforward. no? >>> As mentioned in the original proposal, there are still a open problems >>> around extsize and forcealign. >>> >>> - The allocation and deallocation semantics are not completely clear to >>> me for example we allow operations like unaligned punch_hole but not >>> unaligned insert and collapse range, and I couldn't see that >>> documented anywhere. >> >> For xfs, we were imposing the same restrictions as which we have for >> rtextsize > 1. >> >> If you check the following: >> https://urldefense.com/v3/__https://lore.kernel.org/linux-xfs/20240813163638.3751939-9-john.g.garry@oracle.com/__;!!ACWV5N9M2RV99hQ!OJKieZJEIvc-M87u_dxAxiEGC4zN0PQmfdLT6k73Y7_Lvr9m-iodyrytRCFxDPbVzsOlk-1kuXXvaKLSPqPbqA$ >> >> You can see how the large allocunit value is affected by forcealign, and >> then check callers of xfs_is_falloc_aligned() -> xfs_inode_alloc_unitsize() >> to see how this affects some fallocate modes. > > True, but it's something that just implicitly happens when we use > forcealign. I eventually found out while testing forcealign with > different operations but such things can come as a surprise to users > especially when we support some operations to be unaligned and then > reject some other similar ones. > > punch_hole/collapse_range is just an example and yes it might not be > very important to support unaligned collapse range but in the long run > it would be good to have these things documented/discussed. Maybe the man pages can be documented for forcealign/rtextsize > 1 punch holes/collapse behaviour - at a quick glance, I could not see anything. Indeed, I am not sure how bigalloc affects punch holes/collapse range either. Thanks, John