bcachefs: BCH_FS_clean_recovery

Add a filesystem flag to indicate whether we did a clean recovery -
using c->sb.clean after we've got rw is incorrect, since c->sb is
updated whenever we write the superblock.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

Author: Kent Overstreet

fs/bcachefs/bcachefs.h

@@ -594,6 +594,7 @@ struct bch_dev {
 #define BCH_FS_FLAGS()			\
 	x(new_fs)			\
 	x(started)			\
+	x(clean_recovery)		\
 	x(btree_running)		\
 	x(accounting_replay_done)	\
 	x(may_go_rw)			\

fs/bcachefs/fsck.c

@@ -1084,8 +1084,9 @@ static int check_inode(struct btree_trans *trans,
 		}
 	}
 
+	/* i_size_dirty is vestigal, since we now have logged ops for truncate * */
 	if (u.bi_flags & BCH_INODE_i_size_dirty &&
-	    (!c->sb.clean ||
+	    (!test_bit(BCH_FS_clean_recovery, &c->flags) ||
 	     fsck_err(trans, inode_i_size_dirty_but_clean,
 		      "filesystem marked clean, but inode %llu has i_size dirty",
 		      u.bi_inum))) {
@@ -1114,8 +1115,9 @@ static int check_inode(struct btree_trans *trans,
 		do_update = true;
 	}
 
+	/* i_sectors_dirty is vestigal, i_sectors is always updated transactionally */
 	if (u.bi_flags & BCH_INODE_i_sectors_dirty &&
-	    (!c->sb.clean ||
+	    (!test_bit(BCH_FS_clean_recovery, &c->flags) ||
 	     fsck_err(trans, inode_i_sectors_dirty_but_clean,
 		      "filesystem marked clean, but inode %llu has i_sectors dirty",
 		      u.bi_inum))) {

fs/bcachefs/inode.c

@@ -1113,7 +1113,7 @@ static int may_delete_deleted_inode(struct btree_trans *trans,
 			pos.offset, pos.snapshot))
 		goto delete;
 
-	if (c->sb.clean &&
+	if (test_bit(BCH_FS_clean_recovery, &c->flags) &&
 	    !fsck_err(trans, deleted_inode_but_clean,
 		      "filesystem marked as clean but have deleted inode %llu:%u",
 		      pos.offset, pos.snapshot)) {

fs/bcachefs/recovery.c

@@ -717,6 +717,8 @@ int bch2_fs_recovery(struct bch_fs *c)
 
 	if (c->opts.fsck)
 		set_bit(BCH_FS_fsck_running, &c->flags);
+	if (c->sb.clean)
+		set_bit(BCH_FS_clean_recovery, &c->flags);
 
 	ret = bch2_blacklist_table_initialize(c);
 	if (ret) {