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authorChao Yu <yuchao0@huawei.com>2016-11-17 20:53:11 +0800
committerJaegeuk Kim <jaegeuk@kernel.org>2016-11-25 10:16:01 -0800
commit04d47e673863c637a2b44ad34a558aeb5d0a727e (patch)
treee35422bfca5033adda54c0716c498c5b75895677 /fs/f2fs
parentd40a43af0a57a017eba9ad2679183791587ceb6a (diff)
f2fs: fix to account total free nid correctly
Thread A Thread B Thread C - f2fs_create - f2fs_new_inode - f2fs_lock_op - alloc_nid alloc last nid - f2fs_unlock_op - f2fs_create - f2fs_new_inode - f2fs_lock_op - alloc_nid as node count still not be increased, we will loop in alloc_nid - f2fs_write_node_pages - f2fs_balance_fs_bg - f2fs_sync_fs - write_checkpoint - block_operations - f2fs_lock_all - f2fs_lock_op While creating new inode, we do not allocate and account nid atomically, so that when there is almost no free nids left, we may encounter deadloop like above stack. In order to avoid that, reuse nm_i::available_nids for accounting free nids and make nid allocation and counting being atomical during node creation. Signed-off-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs')
-rw-r--r--fs/f2fs/f2fs.h2
-rw-r--r--fs/f2fs/node.c34
2 files changed, 30 insertions, 6 deletions
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index ae758e8c245d..1693d4cb593b 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -512,7 +512,7 @@ enum nid_list {
struct f2fs_nm_info {
block_t nat_blkaddr; /* base disk address of NAT */
nid_t max_nid; /* maximum possible node ids */
- nid_t available_nids; /* maximum available node ids */
+ nid_t available_nids; /* # of available node ids */
nid_t next_scan_nid; /* the next nid to be scanned */
unsigned int ram_thresh; /* control the memory footprint */
unsigned int ra_nid_pages; /* # of nid pages to be readaheaded */
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 1de25f871016..c1bbfdcf519d 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1884,11 +1884,13 @@ retry:
if (time_to_inject(sbi, FAULT_ALLOC_NID))
return false;
#endif
- if (unlikely(sbi->total_valid_node_count + 1 > nm_i->available_nids))
- return false;
-
spin_lock(&nm_i->nid_list_lock);
+ if (unlikely(nm_i->available_nids == 0)) {
+ spin_unlock(&nm_i->nid_list_lock);
+ return false;
+ }
+
/* We should not use stale free nids created by build_free_nids */
if (nm_i->nid_cnt[FREE_NID_LIST] && !on_build_free_nids(nm_i)) {
f2fs_bug_on(sbi, list_empty(&nm_i->nid_list[FREE_NID_LIST]));
@@ -1899,6 +1901,7 @@ retry:
__remove_nid_from_list(sbi, i, FREE_NID_LIST, true);
i->state = NID_ALLOC;
__insert_nid_to_list(sbi, i, ALLOC_NID_LIST, false);
+ nm_i->available_nids--;
spin_unlock(&nm_i->nid_list_lock);
return true;
}
@@ -1950,6 +1953,9 @@ void alloc_nid_failed(struct f2fs_sb_info *sbi, nid_t nid)
i->state = NID_NEW;
__insert_nid_to_list(sbi, i, FREE_NID_LIST, false);
}
+
+ nm_i->available_nids++;
+
spin_unlock(&nm_i->nid_list_lock);
if (need_free)
@@ -2149,6 +2155,19 @@ static void remove_nats_in_journal(struct f2fs_sb_info *sbi)
ne = grab_nat_entry(nm_i, nid);
node_info_from_raw_nat(&ne->ni, &raw_ne);
}
+
+ /*
+ * if a free nat in journal has not been used after last
+ * checkpoint, we should remove it from available nids,
+ * since later we will add it again.
+ */
+ if (!get_nat_flag(ne, IS_DIRTY) &&
+ le32_to_cpu(raw_ne.block_addr) == NULL_ADDR) {
+ spin_lock(&nm_i->nid_list_lock);
+ nm_i->available_nids--;
+ spin_unlock(&nm_i->nid_list_lock);
+ }
+
__set_nat_cache_dirty(nm_i, ne);
}
update_nats_in_cursum(journal, -i);
@@ -2221,8 +2240,12 @@ static void __flush_nat_entry_set(struct f2fs_sb_info *sbi,
raw_nat_from_node_info(raw_ne, &ne->ni);
nat_reset_flag(ne);
__clear_nat_cache_dirty(NM_I(sbi), ne);
- if (nat_get_blkaddr(ne) == NULL_ADDR)
+ if (nat_get_blkaddr(ne) == NULL_ADDR) {
add_free_nid(sbi, nid, false);
+ spin_lock(&NM_I(sbi)->nid_list_lock);
+ NM_I(sbi)->available_nids++;
+ spin_unlock(&NM_I(sbi)->nid_list_lock);
+ }
}
if (to_journal)
@@ -2297,7 +2320,8 @@ static int init_node_manager(struct f2fs_sb_info *sbi)
nm_i->max_nid = NAT_ENTRY_PER_BLOCK * nat_blocks;
/* not used nids: 0, node, meta, (and root counted as valid node) */
- nm_i->available_nids = nm_i->max_nid - F2FS_RESERVED_NODE_NUM;
+ nm_i->available_nids = nm_i->max_nid - sbi->total_valid_node_count -
+ F2FS_RESERVED_NODE_NUM;
nm_i->nid_cnt[FREE_NID_LIST] = 0;
nm_i->nid_cnt[ALLOC_NID_LIST] = 0;
nm_i->nat_cnt = 0;