mirror of
https://github.com/versity/scoutfs.git
synced 2026-02-07 11:10:44 +00:00
2efba47b77
The previous fallocate and get_block allocators only looked for free extents larger than the requested allocation size. This prematurely returns -ENOSPC if a very large allocation is attempted. Some xfstests stress low free space situations by fallocating almost all the free space in the volume. This adds an allocation helper function that finds the biggest free extent to satisfy an allocation, psosibly after trying to get more free extents from the server. It looks for previous extents in the index of extents by length. This builds on the previously added item and extent _prev operations. Allocators need to then know the size of the allocation they got instead of assuming they got what they asked for. The server can also return a smaller extent so it needs to communicate the extent length, not just its start. Signed-off-by: Zach Brown <zab@versity.com>