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you for your feedback. On 5/15/26 2:39 PM, Dave Chinner wrote: > On Thu, May 14, 2026 at 10:19:14AM -0700, Dai Ngo wrote: >> On 5/13/26 5:25 PM, Darrick J. Wong wrote: >>> On Wed, May 13, 2026 at 10:28:31AM -0700, Dai Ngo wrote: >>>> IMHO, I think we still should fix xfs_fs_map_blocks() to avoid any overhead >>>> and complication in ext_tree_insert having to handle overlapping extents. >>> I don't know enough about the nfs blocklayout code to say for sure, but >>> it seems like you want to upsert the mapping returned by >>> xfs_fs_map_blocks into the "ext_tree" right? >> This is currently done on the NFS client side by ext_tree_insert(). The >> question I have is should we enhance the server side by passing '0' to >> xfs_fs_map_blocks() so the client does not have to do the work of >> handling the overlap extents. > I think you've all missed the optimal solution to the problem. > > The problem is not the use of XFS_BMAPI_ENTIRE on the first mapping > call, it's the use of it on the -second- after the first call didn't > return a range that mapped the -entire- request range. Currently the map_blocks() API between the NFS server and XFS does not provide a way to specify whether XFS should use XFS_BMAPI_ENTIRE or '0'. xfs_fs_map_blocks() just uses XFS_BMAPI_ENTIRE. On the first mapping call, NFS server always specify the whole file range that requested by the client in the LAYOUTGET. So if xfs_fs_map_blocks() can not return the requested mapping range with '0' on the first mapping call then I think using XFS_BMAPI_ENTIRE in the first mapping call makes any different. -Dai > > Hence the second and subsequent calls need range trimming so that > they don't overlap with the first range that was returned. > > IOWs, we keep the use XFS_BMAPI_ENTIRE for the first mapping call > so we retain the optimisation that minimises the number of pNFS > client mapping calls needed, but if it needs to make a second call > we drop the ENTIRE flag and append extents trimmed to the range > being asked for (which doesn't include the first extent already > returned). > > That was we get large extents reported most of the time, and in the > corner cases where we have a race like this one or an extent > boundary lies in the middle of the requested range, we will get > correct, non-overlapping behaviour. > > Best of both worlds, yes? > > -Dave.