[PATCH 19/29] xfs: dynamically allocate the xfs-qm shrinker
From: Qi Zheng <hidden>
Date: 2023-06-22 09:02:47
Also in:
dm-devel, dri-devel, intel-gfx, linux-arm-msm, linux-bcache, linux-btrfs, linux-ext4, linux-fsdevel, linux-mm, linux-nfs, linux-xfs, lkml
Subsystem:
filesystems (vfs and infrastructure), the rest, xfs filesystem · Maintainers:
Alexander Viro, Christian Brauner, Linus Torvalds, Carlos Maiolino
In preparation for implementing lockless slab shrink, we need to dynamically allocate the xfs-qm shrinker, so that it can be freed asynchronously using kfree_rcu(). Then it doesn't need to wait for RCU read-side critical section when releasing the struct xfs_quotainfo. Signed-off-by: Qi Zheng <redacted> --- fs/xfs/xfs_qm.c | 24 +++++++++++++----------- fs/xfs/xfs_qm.h | 2 +- 2 files changed, 14 insertions(+), 12 deletions(-)
diff --git a/fs/xfs/xfs_qm.c b/fs/xfs/xfs_qm.c
index 6abcc34fafd8..b15320d469cc 100644
--- a/fs/xfs/xfs_qm.c
+++ b/fs/xfs/xfs_qm.c@@ -504,8 +504,7 @@ xfs_qm_shrink_scan( struct shrinker *shrink, struct shrink_control *sc) { - struct xfs_quotainfo *qi = container_of(shrink, - struct xfs_quotainfo, qi_shrinker); + struct xfs_quotainfo *qi = shrink->private_data; struct xfs_qm_isolate isol; unsigned long freed; int error;
@@ -539,8 +538,7 @@ xfs_qm_shrink_count( struct shrinker *shrink, struct shrink_control *sc) { - struct xfs_quotainfo *qi = container_of(shrink, - struct xfs_quotainfo, qi_shrinker); + struct xfs_quotainfo *qi = shrink->private_data; return list_lru_shrink_count(&qi->qi_lru, sc); }
@@ -680,18 +678,22 @@ xfs_qm_init_quotainfo( if (XFS_IS_PQUOTA_ON(mp)) xfs_qm_set_defquota(mp, XFS_DQTYPE_PROJ, qinf); - qinf->qi_shrinker.count_objects = xfs_qm_shrink_count; - qinf->qi_shrinker.scan_objects = xfs_qm_shrink_scan; - qinf->qi_shrinker.seeks = DEFAULT_SEEKS; - qinf->qi_shrinker.flags = SHRINKER_NUMA_AWARE; + qinf->qi_shrinker = shrinker_alloc_and_init(xfs_qm_shrink_count, + xfs_qm_shrink_scan, + 0, DEFAULT_SEEKS, + SHRINKER_NUMA_AWARE, qinf); + if (!qinf->qi_shrinker) + goto out_free_inos; - error = register_shrinker(&qinf->qi_shrinker, "xfs-qm:%s", + error = register_shrinker(qinf->qi_shrinker, "xfs-qm:%s", mp->m_super->s_id); if (error) - goto out_free_inos; + goto out_shrinker; return 0; +out_shrinker: + shrinker_free(qinf->qi_shrinker); out_free_inos: mutex_destroy(&qinf->qi_quotaofflock); mutex_destroy(&qinf->qi_tree_lock);
@@ -718,7 +720,7 @@ xfs_qm_destroy_quotainfo( qi = mp->m_quotainfo; ASSERT(qi != NULL); - unregister_shrinker(&qi->qi_shrinker); + unregister_and_free_shrinker(qi->qi_shrinker); list_lru_destroy(&qi->qi_lru); xfs_qm_destroy_quotainos(qi); mutex_destroy(&qi->qi_tree_lock);
diff --git a/fs/xfs/xfs_qm.h b/fs/xfs/xfs_qm.h
index 9683f0457d19..d5c9fc4ba591 100644
--- a/fs/xfs/xfs_qm.h
+++ b/fs/xfs/xfs_qm.h@@ -63,7 +63,7 @@ struct xfs_quotainfo { struct xfs_def_quota qi_usr_default; struct xfs_def_quota qi_grp_default; struct xfs_def_quota qi_prj_default; - struct shrinker qi_shrinker; + struct shrinker *qi_shrinker; /* Minimum and maximum quota expiration timestamp values. */ time64_t qi_expiry_min;
--
2.30.2