bcachefs: Update directory timestamps during link

Timestamp updates on the directory during a link operation were cached.
This is inconsistent with other metadata operations such as rename, as
well as being less efficient.
Signed-off-by: Justin Husted <sigstop@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/fs-common.c

@@ -76,11 +76,10 @@ int bch2_create_trans(struct btree_trans *trans, u64 dir_inum,
 }
 
 int bch2_link_trans(struct btree_trans *trans, u64 dir_inum,
-		    u64 inum, struct bch_inode_unpacked *inode_u,
-		    const struct qstr *name)
+		    u64 inum, struct bch_inode_unpacked *dir_u,
+		    struct bch_inode_unpacked *inode_u, const struct qstr *name)
 {
 	struct btree_iter *dir_iter, *inode_iter;
-	struct bch_inode_unpacked dir_u;
 	struct bch_hash_info dir_hash;
 	u64 now = bch2_current_time(trans->c);
 
@@ -91,18 +90,19 @@ int bch2_link_trans(struct btree_trans *trans, u64 dir_inum,
 	inode_u->bi_ctime = now;
 	bch2_inode_nlink_inc(inode_u);
 
-	dir_iter = bch2_inode_peek(trans, &dir_u, dir_inum, 0);
+	dir_iter = bch2_inode_peek(trans, dir_u, dir_inum, 0);
 	if (IS_ERR(dir_iter))
 		return PTR_ERR(dir_iter);
 
-	/* XXX: shouldn't we be updating mtime/ctime on the directory? */
+	dir_u->bi_mtime = dir_u->bi_ctime = now;
 
-	dir_hash = bch2_hash_info_init(trans->c, &dir_u);
+	dir_hash = bch2_hash_info_init(trans->c, dir_u);
 	bch2_trans_iter_put(trans, dir_iter);
 
 	return bch2_dirent_create(trans, dir_inum, &dir_hash,
 				  mode_to_type(inode_u->bi_mode),
 				  name, inum, BCH_HASH_SET_MUST_CREATE) ?:
+		bch2_inode_write(trans, dir_iter, dir_u) ?:
 		bch2_inode_write(trans, inode_iter, inode_u);
 }
 

fs/bcachefs/fs-common.h

@@ -14,6 +14,7 @@ int bch2_create_trans(struct btree_trans *, u64,
 
 int bch2_link_trans(struct btree_trans *, u64,
 		    u64, struct bch_inode_unpacked *,
+		    struct bch_inode_unpacked *,
 		    const struct qstr *);
 
 int bch2_unlink_trans(struct btree_trans *,

fs/bcachefs/fs.c

@@ -395,7 +395,7 @@ static int __bch2_link(struct bch_fs *c,
 		       struct dentry *dentry)
 {
 	struct btree_trans trans;
-	struct bch_inode_unpacked inode_u;
+	struct bch_inode_unpacked dir_u, inode_u;
 	int ret;
 
 	mutex_lock(&inode->ei_update_lock);
@@ -405,7 +405,7 @@ static int __bch2_link(struct bch_fs *c,
 		bch2_trans_begin(&trans);
 		ret   = bch2_link_trans(&trans,
 					dir->v.i_ino,
-					inode->v.i_ino, &inode_u,
+					inode->v.i_ino, &dir_u, &inode_u,
 					&dentry->d_name) ?:
 			bch2_trans_commit(&trans, NULL,
 					&inode->ei_journal_seq,
@@ -413,8 +413,14 @@ static int __bch2_link(struct bch_fs *c,
 					BTREE_INSERT_NOUNLOCK);
 	} while (ret == -EINTR);
 
-	if (likely(!ret))
+	if (likely(!ret)) {
+		BUG_ON(inode_u.bi_inum != inode->v.i_ino);
+
+		journal_seq_copy(inode, dir->ei_journal_seq);
+		bch2_inode_update_after_write(c, dir, &dir_u,
+					      ATTR_MTIME|ATTR_CTIME);
 		bch2_inode_update_after_write(c, inode, &inode_u, ATTR_CTIME);
+	}
 
 	bch2_trans_exit(&trans);
 	mutex_unlock(&inode->ei_update_lock);

fs/bcachefs/fsck.c

@@ -80,7 +80,7 @@ static int reattach_inode(struct bch_fs *c,
 			  struct bch_inode_unpacked *lostfound_inode,
 			  u64 inum)
 {
-	struct bch_inode_unpacked inode_u;
+	struct bch_inode_unpacked dir_u, inode_u;
 	char name_buf[20];
 	struct qstr name;
 	int ret;
@@ -92,7 +92,7 @@ static int reattach_inode(struct bch_fs *c,
 			    BTREE_INSERT_ATOMIC|
 			    BTREE_INSERT_LAZY_RW,
 		bch2_link_trans(&trans, lostfound_inode->bi_inum,
-				inum, &inode_u, &name));
+				inum, &dir_u, &inode_u, &name));
 	if (ret)
 		bch_err(c, "error %i reattaching inode %llu", ret, inum);