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X-MS-Exchange-CrossTenant-Id: b61c8803-16f3-4c35-9b17-6f65f441df86 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: +LAJsBs/Id9aFSM7JjAhzPTJXvDfywAzId3BqLSN5QO9IH3rwMtFAyXJZ/KdrGcwI6AZAbQA+zufkGc/qbERkO1D+dZ7thAhei1jBnsd5K0= X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH2PR04MB6757 On 10/27/26 3:48 PM, Марк Коренберг wrote: > Hi Johannes, > > I rebased your patch onto current master and found a few problems in > review, so I reworked it. v2 is attached. Main issues: > > 1) Data loss during device replace: the replace target has no chunk > stripes until the replace finishes, so all data already copied to > it was reset, and the resumed replace never copies it again. > Trigger: start a replace, umount or remount,ro, then mount rw. > v2 skips the pass while a replace is ongoing. > > 2) Races: chunks can be allocated (data reloc bg, transaction kthread) > and removed (relocating repair after a read error) while the pass > runs, and the removal is not committed yet. v2 takes > reclaim_bgs_lock, commits, and holds chunk_mutex. > > 3) Used zones: v1 marked only the zone where each stripe starts. Today > stripes are exactly one zone long, but mount does not enforce that, > so a longer stripe would get its other zones reset. v2 checks > device->alloc_state instead, the allocator's own record of which > ranges belong to chunks, over the full stripe length. This also > drops the bitmap allocation that could fail the mount. > > 4) Zones that must not be reset: zones beyond total_bytes, read-only > devices, offline and read-only zones. v2 skips them. > > 5) v2 resets adjacent zones in one call and logs each reset range. > > The commit message also now says why the existing code does not help: > btrfs_find_allocatable_zones() skips non-empty zones, so leaked zones > are never reused. And the typo in your Signed-off-by is fixed. > > I used an AI assistant (Claude) for the review and for v2. v2 is build > tested and checkpatch clean, not runtime tested yet. > > Please check that it still covers the case you hit, and tell me if you > prefer to fold it into your patch or keep it as a fix on top. Feel free to take over the patch, I have enough patches in flight atm that I need to get in, so one less on the plate is fine for me.