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 <zhengqi.arch@xxxxxxxxxxxxx>
---
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
