f2fs: make LAZYTIME a mount option flag

Set LAZYTIME into sbi during parsing, and transfer it to the sb in
fill_super, so that an sb is not required during option parsing.

(Note: While lazytime is normally handled via mount flag in the vfs,
some f2fs users do expect to be able to use it as an explicit mount
option string via the mount syscall, so this option must remain.)

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

Author: Eric Sandeen

fs/f2fs/f2fs.h

@@ -117,6 +117,11 @@ extern const char *f2fs_fault_name[FAULT_MAX];
 #define F2FS_MOUNT_AGE_EXTENT_CACHE	0x08000000
 #define F2FS_MOUNT_NAT_BITS		0x10000000
 #define F2FS_MOUNT_INLINECRYPT		0x20000000
+/*
+ * Some f2fs environments expect to be able to pass the "lazytime" option
+ * string rather than using the MS_LAZYTIME flag, so this must remain.
+ */
+#define F2FS_MOUNT_LAZYTIME		0x40000000
 
 #define F2FS_OPTION(sbi)	((sbi)->mount_opt)
 #define clear_opt(sbi, option)	(F2FS_OPTION(sbi).opt &= ~F2FS_MOUNT_##option)

fs/f2fs/super.c

@@ -920,10 +920,10 @@ static int parse_options(struct super_block *sb, char *options, bool is_remount)
 			break;
 #endif
 		case Opt_lazytime:
-			sb->s_flags |= SB_LAZYTIME;
+			set_opt(sbi, LAZYTIME);
 			break;
 		case Opt_nolazytime:
-			sb->s_flags &= ~SB_LAZYTIME;
+			clear_opt(sbi, LAZYTIME);
 			break;
 #ifdef CONFIG_QUOTA
 		case Opt_quota:
@@ -2186,8 +2186,8 @@ static void default_options(struct f2fs_sb_info *sbi, bool remount)
 	set_opt(sbi, INLINE_DATA);
 	set_opt(sbi, INLINE_DENTRY);
 	set_opt(sbi, MERGE_CHECKPOINT);
+	set_opt(sbi, LAZYTIME);
 	F2FS_OPTION(sbi).unusable_cap = 0;
-	sbi->sb->s_flags |= SB_LAZYTIME;
 	if (!f2fs_is_readonly(sbi))
 		set_opt(sbi, FLUSH_MERGE);
 	if (f2fs_sb_has_blkzoned(sbi))
@@ -4588,6 +4588,11 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
 	if (test_opt(sbi, INLINECRYPT))
 		sb->s_flags |= SB_INLINECRYPT;
 
+	if (test_opt(sbi, LAZYTIME))
+		sb->s_flags |= SB_LAZYTIME;
+	else
+		sb->s_flags &= ~SB_LAZYTIME;
+
 	super_set_uuid(sb, (void *) raw_super->uuid, sizeof(raw_super->uuid));
 	super_set_sysfs_name_bdev(sb);
 	sb->s_iflags |= SB_I_CGROUPWB;