This was my first attempt at caching the last used zone. But it turns out
for O_DIRECT or RWF_DONTCACHE that operate concurrently or in very short
sequence, the bmap btree does not record a written extent yet, so it fails.
Because it then still finds the last written zone it can lead to a weird
ping-pong around a few zones with writers seeing different values.
Remove it entirely as the later added xfs_cached_zone actually does a
much better job enforcing the locality as the zone is associated with the
inode in the MRU cache as soon as the zone is selected.
Fixes: 4e4d52075577 ("xfs: add the zoned space allocator")
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
fs/xfs/xfs_zone_alloc.c | 45 ++---------------------------------------
1 file changed, 2 insertions(+), 43 deletions(-)
diff --git a/fs/xfs/xfs_zone_alloc.c b/fs/xfs/xfs_zone_alloc.c
index f8bd6d741755..dfdb14120614 100644
--- a/fs/xfs/xfs_zone_alloc.c
+++ b/fs/xfs/xfs_zone_alloc.c
@@ -374,44 +374,6 @@ xfs_zone_free_blocks(
return 0;
}
-/*
- * Check if the zone containing the data just before the offset we are
- * writing to is still open and has space.
- */
-static struct xfs_open_zone *
-xfs_last_used_zone(
- struct iomap_ioend *ioend)
-{
- struct xfs_inode *ip = XFS_I(ioend->io_inode);
- struct xfs_mount *mp = ip->i_mount;
- xfs_fileoff_t offset_fsb = XFS_B_TO_FSB(mp, ioend->io_offset);
- struct xfs_rtgroup *rtg = NULL;
- struct xfs_open_zone *oz = NULL;
- struct xfs_iext_cursor icur;
- struct xfs_bmbt_irec got;
-
- xfs_ilock(ip, XFS_ILOCK_SHARED);
- if (!xfs_iext_lookup_extent_before(ip, &ip->i_df, &offset_fsb,
- &icur, &got)) {
- xfs_iunlock(ip, XFS_ILOCK_SHARED);
- return NULL;
- }
- xfs_iunlock(ip, XFS_ILOCK_SHARED);
-
- rtg = xfs_rtgroup_grab(mp, xfs_rtb_to_rgno(mp, got.br_startblock));
- if (!rtg)
- return NULL;
-
- xfs_ilock(rtg_rmap(rtg), XFS_ILOCK_SHARED);
- oz = READ_ONCE(rtg->rtg_open_zone);
- if (oz && (oz->oz_is_gc || !atomic_inc_not_zero(&oz->oz_ref)))
- oz = NULL;
- xfs_iunlock(rtg_rmap(rtg), XFS_ILOCK_SHARED);
-
- xfs_rtgroup_rele(rtg);
- return oz;
-}
-
static struct xfs_group *
xfs_find_free_zone(
struct xfs_mount *mp,
@@ -918,12 +880,9 @@ xfs_zone_alloc_and_submit(
goto out_error;
/*
- * If we don't have a cached zone in this write context, see if the
- * last extent before the one we are writing to points to an active
- * zone. If so, just continue writing to it.
+ * If we don't have a locally cached zone in this write context, see if
+ * the inode is still associated with a zone and use that if so.
*/
- if (!*oz && ioend->io_offset)
- *oz = xfs_last_used_zone(ioend);
if (!*oz)
*oz = xfs_cached_zone(mp, ip);
--
2.47.2
