diff options
| author | Christoph Hellwig <hch@lst.de> | 2025-02-15 19:37:19 +0100 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2025-03-03 08:17:07 -0700 |
| commit | 080d01c41d44f0993f2c235a6bfdb681f0a66be6 (patch) | |
| tree | 15727fa528ba207e68ec5ad524664ca5ba0051fe /fs/xfs/xfs_zone_alloc.h | |
| parent | 0bb2193056b5969e4148fc0909e89a5362da873e (diff) | |
xfs: implement zoned garbage collection
RT groups on a zoned file system need to be completely empty before their
space can be reused. This means that partially empty groups need to be
emptied entirely to free up space if no entirely free groups are
available.
Add a garbage collection thread that moves all data out of the least used
zone when not enough free zones are available, and which resets all zones
that have been emptied. To find empty zone a simple set of 10 buckets
based on the amount of space used in the zone is used. To empty zones,
the rmap is walked to find the owners and the data is read and then
written to the new place.
To automatically defragment files the rmap records are sorted by inode
and logical offset. This means defragmentation of parallel writes into
a single zone happens automatically when performing garbage collection.
Because holding the iolock over the entire GC cycle would inject very
noticeable latency for other accesses to the inodes, the iolock is not
taken while performing I/O. Instead the I/O completion handler checks
that the mapping hasn't changed over the one recorded at the start of
the GC cycle and doesn't update the mapping if it change.
Co-developed-by: Hans Holmberg <hans.holmberg@wdc.com>
Signed-off-by: Hans Holmberg <hans.holmberg@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Diffstat (limited to 'fs/xfs/xfs_zone_alloc.h')
| -rw-r--r-- | fs/xfs/xfs_zone_alloc.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/xfs/xfs_zone_alloc.h b/fs/xfs/xfs_zone_alloc.h index 28c9cffb72d5..1269390bfcda 100644 --- a/fs/xfs/xfs_zone_alloc.h +++ b/fs/xfs/xfs_zone_alloc.h @@ -48,6 +48,8 @@ uint64_t xfs_zoned_default_resblks(struct xfs_mount *mp, #ifdef CONFIG_XFS_RT int xfs_mount_zones(struct xfs_mount *mp); void xfs_unmount_zones(struct xfs_mount *mp); +void xfs_zone_gc_start(struct xfs_mount *mp); +void xfs_zone_gc_stop(struct xfs_mount *mp); #else static inline int xfs_mount_zones(struct xfs_mount *mp) { @@ -56,6 +58,12 @@ static inline int xfs_mount_zones(struct xfs_mount *mp) static inline void xfs_unmount_zones(struct xfs_mount *mp) { } +static inline void xfs_zone_gc_start(struct xfs_mount *mp) +{ +} +static inline void xfs_zone_gc_stop(struct xfs_mount *mp) +{ +} #endif /* CONFIG_XFS_RT */ #endif /* _XFS_ZONE_ALLOC_H */ |