diff options
Diffstat (limited to 'fs/gfs2/quota.c')
| -rw-r--r-- | fs/gfs2/quota.c | 118 |
1 files changed, 69 insertions, 49 deletions
diff --git a/fs/gfs2/quota.c b/fs/gfs2/quota.c index 466516ac5e57..453b50eaddec 100644 --- a/fs/gfs2/quota.c +++ b/fs/gfs2/quota.c @@ -51,6 +51,7 @@ #include <linux/quota.h> #include <linux/dqblk_xfs.h> #include <linux/lockref.h> +#include <linux/list_lru.h> #include "gfs2.h" #include "incore.h" @@ -72,29 +73,25 @@ struct gfs2_quota_change_host { struct kqid qc_id; }; -static LIST_HEAD(qd_lru_list); -static atomic_t qd_lru_count = ATOMIC_INIT(0); +/* Lock order: qd_lock -> qd->lockref.lock -> lru lock */ static DEFINE_SPINLOCK(qd_lock); +struct list_lru gfs2_qd_lru; -unsigned long gfs2_qd_shrink_scan(struct shrinker *shrink, - struct shrink_control *sc) +static void gfs2_qd_dispose(struct list_head *list) { struct gfs2_quota_data *qd; struct gfs2_sbd *sdp; - int nr_to_scan = sc->nr_to_scan; - long freed = 0; - if (!(sc->gfp_mask & __GFP_FS)) - return SHRINK_STOP; - - spin_lock(&qd_lock); - while (nr_to_scan && !list_empty(&qd_lru_list)) { - qd = list_entry(qd_lru_list.next, - struct gfs2_quota_data, qd_reclaim); + while (!list_empty(list)) { + qd = list_entry(list->next, struct gfs2_quota_data, qd_lru); sdp = qd->qd_gl->gl_sbd; + list_del(&qd->qd_lru); + /* Free from the filesystem-specific list */ + spin_lock(&qd_lock); list_del(&qd->qd_list); + spin_unlock(&qd_lock); gfs2_assert_warn(sdp, !qd->qd_change); gfs2_assert_warn(sdp, !qd->qd_slot_count); @@ -104,24 +101,59 @@ unsigned long gfs2_qd_shrink_scan(struct shrinker *shrink, atomic_dec(&sdp->sd_quota_count); /* Delete it from the common reclaim list */ - list_del_init(&qd->qd_reclaim); - atomic_dec(&qd_lru_count); - spin_unlock(&qd_lock); kmem_cache_free(gfs2_quotad_cachep, qd); - spin_lock(&qd_lock); - nr_to_scan--; - freed++; } - spin_unlock(&qd_lock); +} + + +static enum lru_status gfs2_qd_isolate(struct list_head *item, spinlock_t *lock, void *arg) +{ + struct list_head *dispose = arg; + struct gfs2_quota_data *qd = list_entry(item, struct gfs2_quota_data, qd_lru); + + if (!spin_trylock(&qd->qd_lockref.lock)) + return LRU_SKIP; + + if (qd->qd_lockref.count == 0) { + lockref_mark_dead(&qd->qd_lockref); + list_move(&qd->qd_lru, dispose); + } + + spin_unlock(&qd->qd_lockref.lock); + return LRU_REMOVED; +} + +static unsigned long gfs2_qd_shrink_scan(struct shrinker *shrink, + struct shrink_control *sc) +{ + LIST_HEAD(dispose); + unsigned long freed; + + if (!(sc->gfp_mask & __GFP_FS)) + return SHRINK_STOP; + + freed = list_lru_walk_node(&gfs2_qd_lru, sc->nid, gfs2_qd_isolate, + &dispose, &sc->nr_to_scan); + + gfs2_qd_dispose(&dispose); + return freed; } -unsigned long gfs2_qd_shrink_count(struct shrinker *shrink, - struct shrink_control *sc) +static unsigned long gfs2_qd_shrink_count(struct shrinker *shrink, + struct shrink_control *sc) { - return vfs_pressure_ratio(atomic_read(&qd_lru_count)); + return vfs_pressure_ratio(list_lru_count_node(&gfs2_qd_lru, sc->nid)); } +struct shrinker gfs2_qd_shrinker = { + .count_objects = gfs2_qd_shrink_count, + .scan_objects = gfs2_qd_shrink_scan, + .seeks = DEFAULT_SEEKS, + .flags = SHRINKER_NUMA_AWARE, +}; + + static u64 qd2index(struct gfs2_quota_data *qd) { struct kqid qid = qd->qd_id; @@ -153,7 +185,7 @@ static int qd_alloc(struct gfs2_sbd *sdp, struct kqid qid, spin_lock_init(&qd->qd_lockref.lock); qd->qd_id = qid; qd->qd_slot = -1; - INIT_LIST_HEAD(&qd->qd_reclaim); + INIT_LIST_HEAD(&qd->qd_lru); error = gfs2_glock_get(sdp, qd2index(qd), &gfs2_quota_glops, CREATE, &qd->qd_gl); @@ -181,13 +213,9 @@ static int qd_get(struct gfs2_sbd *sdp, struct kqid qid, found = 0; spin_lock(&qd_lock); list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) { - if (qid_eq(qd->qd_id, qid)) { - lockref_get(&qd->qd_lockref); - if (!list_empty(&qd->qd_reclaim)) { - /* Remove it from reclaim list */ - list_del_init(&qd->qd_reclaim); - atomic_dec(&qd_lru_count); - } + if (qid_eq(qd->qd_id, qid) && + lockref_get_not_dead(&qd->qd_lockref)) { + list_lru_del(&gfs2_qd_lru, &qd->qd_lru); found = 1; break; } @@ -229,18 +257,13 @@ static void qd_hold(struct gfs2_quota_data *qd) static void qd_put(struct gfs2_quota_data *qd) { - spin_lock(&qd_lock); - - if (!lockref_put_or_lock(&qd->qd_lockref)) { + if (lockref_put_or_lock(&qd->qd_lockref)) + return; - /* Add to the reclaim list */ - list_add_tail(&qd->qd_reclaim, &qd_lru_list); - atomic_inc(&qd_lru_count); + qd->qd_lockref.count = 0; + list_lru_add(&gfs2_qd_lru, &qd->qd_lru); + spin_unlock(&qd->qd_lockref.lock); - spin_unlock(&qd->qd_lockref.lock); - } - - spin_unlock(&qd_lock); } static int slot_get(struct gfs2_quota_data *qd) @@ -398,11 +421,11 @@ static int qd_check_sync(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd, (sync_gen && (qd->qd_sync_gen >= *sync_gen))) return 0; - list_move_tail(&qd->qd_list, &sdp->sd_quota_list); + if (!lockref_get_not_dead(&qd->qd_lockref)) + return 0; + list_move_tail(&qd->qd_list, &sdp->sd_quota_list); set_bit(QDF_LOCKED, &qd->qd_flags); - gfs2_assert_warn(sdp, !__lockref_is_dead(&qd->qd_lockref)); - lockref_get(&qd->qd_lockref); qd->qd_change_sync = qd->qd_change; gfs2_assert_warn(sdp, qd->qd_slot_count); qd->qd_slot_count++; @@ -1329,10 +1352,7 @@ void gfs2_quota_cleanup(struct gfs2_sbd *sdp) list_del(&qd->qd_list); /* Also remove if this qd exists in the reclaim list */ - if (!list_empty(&qd->qd_reclaim)) { - list_del_init(&qd->qd_reclaim); - atomic_dec(&qd_lru_count); - } + list_lru_del(&gfs2_qd_lru, &qd->qd_lru); atomic_dec(&sdp->sd_quota_count); spin_unlock(&qd_lock); @@ -1487,7 +1507,7 @@ static int gfs2_quota_get_xstate(struct super_block *sb, } fqs->qs_uquota.qfs_nextents = 1; /* unsupported */ fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */ - fqs->qs_incoredqs = atomic_read(&qd_lru_count); + fqs->qs_incoredqs = list_lru_count(&gfs2_qd_lru); return 0; } |