f2fs: convert to MAX_SBI_FLAG instead of 32 in stat_show()

BIW reduce the s_flag array size and make s_flag constant.
Signed-off-by: Yangtao Li <frank.li@vivo.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/debug.c

@@ -336,22 +336,22 @@ static void update_mem_info(struct f2fs_sb_info *sbi)
 #endif
 }
 
-static char *s_flag[] = {
-	[SBI_IS_DIRTY]		= " fs_dirty",
-	[SBI_IS_CLOSE]		= " closing",
-	[SBI_NEED_FSCK]		= " need_fsck",
-	[SBI_POR_DOING]		= " recovering",
-	[SBI_NEED_SB_WRITE]	= " sb_dirty",
-	[SBI_NEED_CP]		= " need_cp",
-	[SBI_IS_SHUTDOWN]	= " shutdown",
-	[SBI_IS_RECOVERED]	= " recovered",
-	[SBI_CP_DISABLED]	= " cp_disabled",
-	[SBI_CP_DISABLED_QUICK]	= " cp_disabled_quick",
-	[SBI_QUOTA_NEED_FLUSH]	= " quota_need_flush",
-	[SBI_QUOTA_SKIP_FLUSH]	= " quota_skip_flush",
-	[SBI_QUOTA_NEED_REPAIR]	= " quota_need_repair",
-	[SBI_IS_RESIZEFS]	= " resizefs",
-	[SBI_IS_FREEZING]	= " freezefs",
+static const char *s_flag[MAX_SBI_FLAG] = {
+	[SBI_IS_DIRTY]		= "fs_dirty",
+	[SBI_IS_CLOSE]		= "closing",
+	[SBI_NEED_FSCK]		= "need_fsck",
+	[SBI_POR_DOING]		= "recovering",
+	[SBI_NEED_SB_WRITE]	= "sb_dirty",
+	[SBI_NEED_CP]		= "need_cp",
+	[SBI_IS_SHUTDOWN]	= "shutdown",
+	[SBI_IS_RECOVERED]	= "recovered",
+	[SBI_CP_DISABLED]	= "cp_disabled",
+	[SBI_CP_DISABLED_QUICK]	= "cp_disabled_quick",
+	[SBI_QUOTA_NEED_FLUSH]	= "quota_need_flush",
+	[SBI_QUOTA_SKIP_FLUSH]	= "quota_skip_flush",
+	[SBI_QUOTA_NEED_REPAIR]	= "quota_need_repair",
+	[SBI_IS_RESIZEFS]	= "resizefs",
+	[SBI_IS_FREEZING]	= "freezefs",
 };
 
 static const char *ipu_mode_names[F2FS_IPU_MAX] = {
@@ -384,8 +384,8 @@ static int stat_show(struct seq_file *s, void *v)
 			"Disabled" : (f2fs_cp_error(sbi) ? "Error" : "Good"));
 		if (sbi->s_flag) {
 			seq_puts(s, "[SBI:");
-			for_each_set_bit(j, &sbi->s_flag, 32)
-				seq_puts(s, s_flag[j]);
+			for_each_set_bit(j, &sbi->s_flag, MAX_SBI_FLAG)
+				seq_printf(s, " %s", s_flag[j]);
 			seq_puts(s, "]\n");
 		}
 		seq_printf(s, "[SB: 1] [CP: 2] [SIT: %d] [NAT: %d] ",

fs/f2fs/f2fs.h

@@ -1274,7 +1274,10 @@ struct f2fs_gc_control {
 	unsigned int nr_free_secs;	/* # of free sections to do GC */
 };
 
-/* For s_flag in struct f2fs_sb_info */
+/*
+ * For s_flag in struct f2fs_sb_info
+ * Modification on enum should be synchronized with s_flag array
+ */
 enum {
 	SBI_IS_DIRTY,				/* dirty flag for checkpoint */
 	SBI_IS_CLOSE,				/* specify unmounting */
@@ -1291,6 +1294,7 @@ enum {
 	SBI_QUOTA_NEED_REPAIR,			/* quota file may be corrupted */
 	SBI_IS_RESIZEFS,			/* resizefs is in process */
 	SBI_IS_FREEZING,			/* freezefs is in process */
+	MAX_SBI_FLAG,
 };
 
 enum {