[PATCH AUTOSEL 5.4 10/17] f2fs: avoid race condition for shrinker count
Sasha Levin
sashal at kernel.org
Wed Dec 30 08:03:50 EST 2020
From: Jaegeuk Kim <jaegeuk at kernel.org>
[ Upstream commit a95ba66ac1457b76fe472c8e092ab1006271f16c ]
Light reported sometimes shinker gets nat_cnt < dirty_nat_cnt resulting in
wrong do_shinker work. Let's avoid to return insane overflowed value by adding
single tracking value.
Reported-by: Light Hsieh <Light.Hsieh at mediatek.com>
Reviewed-by: Chao Yu <yuchao0 at huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk at kernel.org>
Signed-off-by: Sasha Levin <sashal at kernel.org>
---
fs/f2fs/checkpoint.c | 2 +-
fs/f2fs/debug.c | 11 ++++++-----
fs/f2fs/f2fs.h | 10 ++++++++--
fs/f2fs/node.c | 29 ++++++++++++++++++-----------
fs/f2fs/node.h | 4 ++--
fs/f2fs/shrinker.c | 4 +---
6 files changed, 36 insertions(+), 24 deletions(-)
diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index c966ccc44c157..a57219c51c01a 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -1596,7 +1596,7 @@ int f2fs_write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
goto out;
}
- if (NM_I(sbi)->dirty_nat_cnt == 0 &&
+ if (NM_I(sbi)->nat_cnt[DIRTY_NAT] == 0 &&
SIT_I(sbi)->dirty_sentries == 0 &&
prefree_segments(sbi) == 0) {
f2fs_flush_sit_entries(sbi, cpc);
diff --git a/fs/f2fs/debug.c b/fs/f2fs/debug.c
index 9b0bedd82581b..d8d64447bc947 100644
--- a/fs/f2fs/debug.c
+++ b/fs/f2fs/debug.c
@@ -107,8 +107,8 @@ static void update_general_status(struct f2fs_sb_info *sbi)
si->node_pages = NODE_MAPPING(sbi)->nrpages;
if (sbi->meta_inode)
si->meta_pages = META_MAPPING(sbi)->nrpages;
- si->nats = NM_I(sbi)->nat_cnt;
- si->dirty_nats = NM_I(sbi)->dirty_nat_cnt;
+ si->nats = NM_I(sbi)->nat_cnt[TOTAL_NAT];
+ si->dirty_nats = NM_I(sbi)->nat_cnt[DIRTY_NAT];
si->sits = MAIN_SEGS(sbi);
si->dirty_sits = SIT_I(sbi)->dirty_sentries;
si->free_nids = NM_I(sbi)->nid_cnt[FREE_NID];
@@ -254,9 +254,10 @@ static void update_mem_info(struct f2fs_sb_info *sbi)
si->cache_mem += (NM_I(sbi)->nid_cnt[FREE_NID] +
NM_I(sbi)->nid_cnt[PREALLOC_NID]) *
sizeof(struct free_nid);
- si->cache_mem += NM_I(sbi)->nat_cnt * sizeof(struct nat_entry);
- si->cache_mem += NM_I(sbi)->dirty_nat_cnt *
- sizeof(struct nat_entry_set);
+ si->cache_mem += NM_I(sbi)->nat_cnt[TOTAL_NAT] *
+ sizeof(struct nat_entry);
+ si->cache_mem += NM_I(sbi)->nat_cnt[DIRTY_NAT] *
+ sizeof(struct nat_entry_set);
si->cache_mem += si->inmem_pages * sizeof(struct inmem_pages);
for (i = 0; i < MAX_INO_ENTRY; i++)
si->cache_mem += sbi->im[i].ino_num * sizeof(struct ino_entry);
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 63440abe58c42..604fc2391f9f2 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -797,6 +797,13 @@ enum nid_state {
MAX_NID_STATE,
};
+enum nat_state {
+ TOTAL_NAT,
+ DIRTY_NAT,
+ RECLAIMABLE_NAT,
+ MAX_NAT_STATE,
+};
+
struct f2fs_nm_info {
block_t nat_blkaddr; /* base disk address of NAT */
nid_t max_nid; /* maximum possible node ids */
@@ -812,8 +819,7 @@ struct f2fs_nm_info {
struct rw_semaphore nat_tree_lock; /* protect nat_tree_lock */
struct list_head nat_entries; /* cached nat entry list (clean) */
spinlock_t nat_list_lock; /* protect clean nat entry list */
- unsigned int nat_cnt; /* the # of cached nat entries */
- unsigned int dirty_nat_cnt; /* total num of nat entries in set */
+ unsigned int nat_cnt[MAX_NAT_STATE]; /* the # of cached nat entries */
unsigned int nat_blocks; /* # of nat blocks */
/* free node ids management */
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 2a4a382f28fed..7c34e49363f40 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -62,8 +62,8 @@ bool f2fs_available_free_memory(struct f2fs_sb_info *sbi, int type)
sizeof(struct free_nid)) >> PAGE_SHIFT;
res = mem_size < ((avail_ram * nm_i->ram_thresh / 100) >> 2);
} else if (type == NAT_ENTRIES) {
- mem_size = (nm_i->nat_cnt * sizeof(struct nat_entry)) >>
- PAGE_SHIFT;
+ mem_size = (nm_i->nat_cnt[TOTAL_NAT] *
+ sizeof(struct nat_entry)) >> PAGE_SHIFT;
res = mem_size < ((avail_ram * nm_i->ram_thresh / 100) >> 2);
if (excess_cached_nats(sbi))
res = false;
@@ -177,7 +177,8 @@ static struct nat_entry *__init_nat_entry(struct f2fs_nm_info *nm_i,
list_add_tail(&ne->list, &nm_i->nat_entries);
spin_unlock(&nm_i->nat_list_lock);
- nm_i->nat_cnt++;
+ nm_i->nat_cnt[TOTAL_NAT]++;
+ nm_i->nat_cnt[RECLAIMABLE_NAT]++;
return ne;
}
@@ -207,7 +208,8 @@ static unsigned int __gang_lookup_nat_cache(struct f2fs_nm_info *nm_i,
static void __del_from_nat_cache(struct f2fs_nm_info *nm_i, struct nat_entry *e)
{
radix_tree_delete(&nm_i->nat_root, nat_get_nid(e));
- nm_i->nat_cnt--;
+ nm_i->nat_cnt[TOTAL_NAT]--;
+ nm_i->nat_cnt[RECLAIMABLE_NAT]--;
__free_nat_entry(e);
}
@@ -253,7 +255,8 @@ static void __set_nat_cache_dirty(struct f2fs_nm_info *nm_i,
if (get_nat_flag(ne, IS_DIRTY))
goto refresh_list;
- nm_i->dirty_nat_cnt++;
+ nm_i->nat_cnt[DIRTY_NAT]++;
+ nm_i->nat_cnt[RECLAIMABLE_NAT]--;
set_nat_flag(ne, IS_DIRTY, true);
refresh_list:
spin_lock(&nm_i->nat_list_lock);
@@ -273,7 +276,8 @@ static void __clear_nat_cache_dirty(struct f2fs_nm_info *nm_i,
set_nat_flag(ne, IS_DIRTY, false);
set->entry_cnt--;
- nm_i->dirty_nat_cnt--;
+ nm_i->nat_cnt[DIRTY_NAT]--;
+ nm_i->nat_cnt[RECLAIMABLE_NAT]++;
}
static unsigned int __gang_lookup_nat_set(struct f2fs_nm_info *nm_i,
@@ -2881,14 +2885,17 @@ int f2fs_flush_nat_entries(struct f2fs_sb_info *sbi, struct cp_control *cpc)
LIST_HEAD(sets);
int err = 0;
- /* during unmount, let's flush nat_bits before checking dirty_nat_cnt */
+ /*
+ * during unmount, let's flush nat_bits before checking
+ * nat_cnt[DIRTY_NAT].
+ */
if (enabled_nat_bits(sbi, cpc)) {
down_write(&nm_i->nat_tree_lock);
remove_nats_in_journal(sbi);
up_write(&nm_i->nat_tree_lock);
}
- if (!nm_i->dirty_nat_cnt)
+ if (!nm_i->nat_cnt[DIRTY_NAT])
return 0;
down_write(&nm_i->nat_tree_lock);
@@ -2899,7 +2906,8 @@ int f2fs_flush_nat_entries(struct f2fs_sb_info *sbi, struct cp_control *cpc)
* into nat entry set.
*/
if (enabled_nat_bits(sbi, cpc) ||
- !__has_cursum_space(journal, nm_i->dirty_nat_cnt, NAT_JOURNAL))
+ !__has_cursum_space(journal,
+ nm_i->nat_cnt[DIRTY_NAT], NAT_JOURNAL))
remove_nats_in_journal(sbi);
while ((found = __gang_lookup_nat_set(nm_i,
@@ -3023,7 +3031,6 @@ static int init_node_manager(struct f2fs_sb_info *sbi)
F2FS_RESERVED_NODE_NUM;
nm_i->nid_cnt[FREE_NID] = 0;
nm_i->nid_cnt[PREALLOC_NID] = 0;
- nm_i->nat_cnt = 0;
nm_i->ram_thresh = DEF_RAM_THRESHOLD;
nm_i->ra_nid_pages = DEF_RA_NID_PAGES;
nm_i->dirty_nats_ratio = DEF_DIRTY_NAT_RATIO_THRESHOLD;
@@ -3160,7 +3167,7 @@ void f2fs_destroy_node_manager(struct f2fs_sb_info *sbi)
__del_from_nat_cache(nm_i, natvec[idx]);
}
}
- f2fs_bug_on(sbi, nm_i->nat_cnt);
+ f2fs_bug_on(sbi, nm_i->nat_cnt[TOTAL_NAT]);
/* destroy nat set cache */
nid = 0;
diff --git a/fs/f2fs/node.h b/fs/f2fs/node.h
index e05af5df56485..4a2e7eaf2b028 100644
--- a/fs/f2fs/node.h
+++ b/fs/f2fs/node.h
@@ -123,13 +123,13 @@ static inline void raw_nat_from_node_info(struct f2fs_nat_entry *raw_ne,
static inline bool excess_dirty_nats(struct f2fs_sb_info *sbi)
{
- return NM_I(sbi)->dirty_nat_cnt >= NM_I(sbi)->max_nid *
+ return NM_I(sbi)->nat_cnt[DIRTY_NAT] >= NM_I(sbi)->max_nid *
NM_I(sbi)->dirty_nats_ratio / 100;
}
static inline bool excess_cached_nats(struct f2fs_sb_info *sbi)
{
- return NM_I(sbi)->nat_cnt >= DEF_NAT_CACHE_THRESHOLD;
+ return NM_I(sbi)->nat_cnt[TOTAL_NAT] >= DEF_NAT_CACHE_THRESHOLD;
}
static inline bool excess_dirty_nodes(struct f2fs_sb_info *sbi)
diff --git a/fs/f2fs/shrinker.c b/fs/f2fs/shrinker.c
index a467aca29cfef..3ceebaaee3840 100644
--- a/fs/f2fs/shrinker.c
+++ b/fs/f2fs/shrinker.c
@@ -18,9 +18,7 @@ static unsigned int shrinker_run_no;
static unsigned long __count_nat_entries(struct f2fs_sb_info *sbi)
{
- long count = NM_I(sbi)->nat_cnt - NM_I(sbi)->dirty_nat_cnt;
-
- return count > 0 ? count : 0;
+ return NM_I(sbi)->nat_cnt[RECLAIMABLE_NAT];
}
static unsigned long __count_free_nids(struct f2fs_sb_info *sbi)
--
2.27.0
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