f2fs: reserve nid resource for quota sysfile

During mkfs, quota sysfiles have already occupied nid resource,
it needs to adjust remaining available nid count in kernel side.
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/debug.c

@@ -49,14 +49,7 @@ static void update_general_status(struct f2fs_sb_info *sbi)
 	si->ndirty_imeta = get_pages(sbi, F2FS_DIRTY_IMETA);
 	si->ndirty_dirs = sbi->ndirty_inode[DIR_INODE];
 	si->ndirty_files = sbi->ndirty_inode[FILE_INODE];
-
-	si->nquota_files = 0;
-	if (f2fs_sb_has_quota_ino(sbi->sb)) {
-		for (i = 0; i < MAXQUOTAS; i++) {
-			if (f2fs_qf_ino(sbi->sb, i))
-				si->nquota_files++;
-		}
-	}
+	si->nquota_files = sbi->nquota_files;
 	si->ndirty_all = sbi->ndirty_inode[DIRTY_META];
 	si->inmem_pages = get_pages(sbi, F2FS_INMEM_PAGES);
 	si->aw_cnt = atomic_read(&sbi->aw_cnt);

fs/f2fs/f2fs.h

@@ -1101,6 +1101,8 @@ struct f2fs_sb_info {
 	block_t reserved_blocks;		/* configurable reserved blocks */
 	block_t current_reserved_blocks;	/* current reserved blocks */
 
+	unsigned int nquota_files;		/* # of quota sysfile */
+
 	u32 s_next_generation;			/* for NFS support */
 
 	/* # of pages, see count_type */

fs/f2fs/node.c

@@ -2661,7 +2661,7 @@ static int init_node_manager(struct f2fs_sb_info *sbi)
 
 	/* not used nids: 0, node, meta, (and root counted as valid node) */
 	nm_i->available_nids = nm_i->max_nid - sbi->total_valid_node_count -
-							F2FS_RESERVED_NODE_NUM;
+				sbi->nquota_files - F2FS_RESERVED_NODE_NUM;
 	nm_i->nid_cnt[FREE_NID] = 0;
 	nm_i->nid_cnt[PREALLOC_NID] = 0;
 	nm_i->nat_cnt = 0;

fs/f2fs/super.c

@@ -1008,7 +1008,8 @@ static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
 	buf->f_bavail = user_block_count - valid_user_blocks(sbi) -
 						sbi->current_reserved_blocks;
 
-	avail_node_count = sbi->total_node_count - F2FS_RESERVED_NODE_NUM;
+	avail_node_count = sbi->total_node_count - sbi->nquota_files -
+						F2FS_RESERVED_NODE_NUM;
 
 	if (avail_node_count > user_block_count) {
 		buf->f_files = user_block_count;
@@ -2462,6 +2463,13 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
 	else
 		sb->s_qcop = &f2fs_quotactl_ops;
 	sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
+
+	if (f2fs_sb_has_quota_ino(sbi->sb)) {
+		for (i = 0; i < MAXQUOTAS; i++) {
+			if (f2fs_qf_ino(sbi->sb, i))
+				sbi->nquota_files++;
+		}
+	}
 #endif
 
 	sb->s_op = &f2fs_sops;