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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: QyEqxQKtuP7qA+Xxu4Y7RLzEsSTJOKSCbH/ph5bBjTbtIrnaGUgxmdh/l96D/NPGMYe9pl6Oq9tPjgbAlA8jjDcUznqeMR2LJAtaVL/hCfs= X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL3PR04MB8075 On 5/15/26 6:39 AM, Christoph Hellwig wrote: > On Wed, May 13, 2026 at 02:34:43PM +0200, Johannes Thumshirn wrote: >> On zoned filesystems, space in block groups that has been freed but not >> yet reset is tracked in bytes_zone_unusable. This space cannot be used for >> new allocations until zone reclaim resets the zones, but it was being >> reported as available space in statfs. >> >> This caused statfs to over-report free space, leading to ENOSPC errors >> when applications tried to allocate based on the reported free space. >> >> Fix this by subtracting bytes_zone_unusable from total_free_data in the >> statfs calculation for zoned filesystems. > This OTOH sounds very wrong. Freed but not reclaimed space is usable, > it just needs work. > man statfs says:                fsblkcnt_t f_bavail;  /* Free blocks available to                                         unprivileged user */ which in my interpretation would include zone_unusable_bytes, as they're not "free blocks available". Or would that be accounted as f_bfree?