bcachefs fixes for v6.8-rc5

Mostly pretty trivial, the user visible ones are:
  - don't barf when replicas_required > replicas
  - fix check_version_upgrade() so it doesn't do something nonsensical
    when we're downgrading
 -----BEGIN PGP SIGNATURE-----
 
 iQIzBAABCgAdFiEEKnAFLkS8Qha+jvQrE6szbY3KbnYFAmXQ7/0ACgkQE6szbY3K
 bnbAVQ//V+25RfGRdb7JW7aXZJHyWdlpJE2Om0Vhbd3kYsEeMwqtugkuS4eE7nLV
 Xbi70de7Y7STXKrrTCAYZp7QIN0HY3VHtMnmh1IzbF31JZtI69AfZDRDKC9ITNhp
 Cf3jwmD9OypanVhdAlH/PIecxFdqglJ3e0V5r8zFibb4H2phn3rGPooNl9NCK+KN
 VZOz2W0roCslPutT89SWBRZl7og8BNky1ZYS3cjE+4gFg+/TTeCqgZXteoJkYR70
 0oS+e33AdhxdLoPV6ePN0faFp4rpwh3mpy2gL4MhddSEqTEoUd0/Is4jmBUJtCps
 pgnFz+D2L4zRg2NnyAMVt4DrjyXNhjZDkbd43aK11yyCYSLmG87KW/95K7ocU60i
 /ZqUWWJ9IQO92ihQ+FxJcFw4pNTTWuzNNjZiGKvSad2/rU6btMKW4g+JbTNt2mqn
 3X43s9pdx1sKvR5HNwvwm3R0mrT1baP+/mdfbgbmVPMS6ijD7KQ6JLhB3wGCFSKA
 /yNxasBt+Rfmn9gVsqRTBaH39GWbVwSwJO+gthLAdqylB/j8xne414BxPdhCXeOW
 5KLvUUoJmIx7VW9NsJms4ES/yMd3xmlsyjOnRLqs4Q1WvxCIoyJnM/i02jRHfrjA
 49qlZIR0Gm8rQw7qmjA/R6LzaY9T70uC1xCAHTQ1C+bvpzQW3M0=
 =XWHd
 -----END PGP SIGNATURE-----

Merge tag 'bcachefs-2024-02-17' of https://evilpiepirate.org/git/bcachefs

Pull bcachefs fixes from Kent Overstreet:
 "Mostly pretty trivial, the user visible ones are:

   - don't barf when replicas_required > replicas

   - fix check_version_upgrade() so it doesn't do something nonsensical
     when we're downgrading"

* tag 'bcachefs-2024-02-17' of https://evilpiepirate.org/git/bcachefs:
  bcachefs: Fix missing va_end()
  bcachefs: Fix check_version_upgrade()
  bcachefs: Clamp replicas_required to replicas
  bcachefs: fix missing endiannes conversion in sb_members
  bcachefs: fix kmemleak in __bch2_read_super error handling path
  bcachefs: Fix missing bch2_err_class() calls

fs/bcachefs/bcachefs.h

@@ -1249,6 +1249,18 @@ static inline struct stdio_redirect *bch2_fs_stdio_redirect(struct bch_fs *c)
 	return stdio;
 }
 
+static inline unsigned metadata_replicas_required(struct bch_fs *c)
+{
+	return min(c->opts.metadata_replicas,
+		   c->opts.metadata_replicas_required);
+}
+
+static inline unsigned data_replicas_required(struct bch_fs *c)
+{
+	return min(c->opts.data_replicas,
+		   c->opts.data_replicas_required);
+}
+
 #define BKEY_PADDED_ONSTACK(key, pad)				\
 	struct { struct bkey_i key; __u64 key ## _pad[pad]; }
 

fs/bcachefs/btree_update_interior.c

@@ -280,7 +280,8 @@ static struct btree *__bch2_btree_node_alloc(struct btree_trans *trans,
 				      writepoint_ptr(&c->btree_write_point),
 				      &devs_have,
 				      res->nr_replicas,
-				      c->opts.metadata_replicas_required,
+				      min(res->nr_replicas,
+					  c->opts.metadata_replicas_required),
 				      watermark, 0, cl, &wp);
 	if (unlikely(ret))
 		return ERR_PTR(ret);

fs/bcachefs/fs.c

@@ -435,7 +435,7 @@ static int bch2_link(struct dentry *old_dentry, struct inode *vdir,
 		bch2_subvol_is_ro(c, inode->ei_subvol) ?:
 		__bch2_link(c, inode, dir, dentry);
 	if (unlikely(ret))
-		return ret;
+		return bch2_err_class(ret);
 
 	ihold(&inode->v);
 	d_instantiate(dentry, &inode->v);
@@ -487,8 +487,9 @@ static int bch2_unlink(struct inode *vdir, struct dentry *dentry)
 	struct bch_inode_info *dir= to_bch_ei(vdir);
 	struct bch_fs *c = dir->v.i_sb->s_fs_info;
 
-	return bch2_subvol_is_ro(c, dir->ei_subvol) ?:
+	int ret = bch2_subvol_is_ro(c, dir->ei_subvol) ?:
 		__bch2_unlink(vdir, dentry, false);
+	return bch2_err_class(ret);
 }
 
 static int bch2_symlink(struct mnt_idmap *idmap,
@@ -523,7 +524,7 @@ static int bch2_symlink(struct mnt_idmap *idmap,
 	return 0;
 err:
 	iput(&inode->v);
-	return ret;
+	return bch2_err_class(ret);
 }
 
 static int bch2_mkdir(struct mnt_idmap *idmap,
@@ -641,7 +642,7 @@ static int bch2_rename2(struct mnt_idmap *idmap,
 			   src_inode,
 			   dst_inode);
 
-	return ret;
+	return bch2_err_class(ret);
 }
 
 static void bch2_setattr_copy(struct mnt_idmap *idmap,

fs/bcachefs/io_write.c

@@ -1564,6 +1564,7 @@ CLOSURE_CALLBACK(bch2_write)
 	BUG_ON(!op->write_point.v);
 	BUG_ON(bkey_eq(op->pos, POS_MAX));
 
+	op->nr_replicas_required = min_t(unsigned, op->nr_replicas_required, op->nr_replicas);
 	op->start_time = local_clock();
 	bch2_keylist_init(&op->insert_keys, op->inline_keys);
 	wbio_init(bio)->put_bio = false;

fs/bcachefs/journal_io.c

@@ -1478,6 +1478,8 @@ static int journal_write_alloc(struct journal *j, struct journal_buf *w)
 		c->opts.foreground_target;
 	unsigned i, replicas = 0, replicas_want =
 		READ_ONCE(c->opts.metadata_replicas);
+	unsigned replicas_need = min_t(unsigned, replicas_want,
+				       READ_ONCE(c->opts.metadata_replicas_required));
 
 	rcu_read_lock();
 retry:
@@ -1526,7 +1528,7 @@ static int journal_write_alloc(struct journal *j, struct journal_buf *w)
 
 	BUG_ON(bkey_val_u64s(&w->key.k) > BCH_REPLICAS_MAX);
 
-	return replicas >= c->opts.metadata_replicas_required ? 0 : -EROFS;
+	return replicas >= replicas_need ? 0 : -EROFS;
 }
 
 static void journal_buf_realloc(struct journal *j, struct journal_buf *buf)

fs/bcachefs/journal_reclaim.c

@@ -205,7 +205,7 @@ void bch2_journal_space_available(struct journal *j)
 
 	j->can_discard = can_discard;
 
-	if (nr_online < c->opts.metadata_replicas_required) {
+	if (nr_online < metadata_replicas_required(c)) {
 		ret = JOURNAL_ERR_insufficient_devices;
 		goto out;
 	}

fs/bcachefs/printbuf.c

@@ -56,6 +56,7 @@ void bch2_prt_vprintf(struct printbuf *out, const char *fmt, va_list args)
 
 		va_copy(args2, args);
 		len = vsnprintf(out->buf + out->pos, printbuf_remaining(out), fmt, args2);
+		va_end(args2);
 	} while (len + 1 >= printbuf_remaining(out) &&
 		 !bch2_printbuf_make_room(out, len + 1));
 

fs/bcachefs/recovery.c

@@ -577,8 +577,9 @@ u64 bch2_recovery_passes_from_stable(u64 v)
 
 static bool check_version_upgrade(struct bch_fs *c)
 {
-	unsigned latest_compatible = bch2_latest_compatible_version(c->sb.version);
 	unsigned latest_version	= bcachefs_metadata_version_current;
+	unsigned latest_compatible = min(latest_version,
+					 bch2_latest_compatible_version(c->sb.version));
 	unsigned old_version = c->sb.version_upgrade_complete ?: c->sb.version;
 	unsigned new_version = 0;
 
@@ -597,7 +598,7 @@ static bool check_version_upgrade(struct bch_fs *c)
 			new_version = latest_version;
 			break;
 		case BCH_VERSION_UPGRADE_none:
-			new_version = old_version;
+			new_version = min(old_version, latest_version);
 			break;
 		}
 	}
@@ -774,7 +775,7 @@ int bch2_fs_recovery(struct bch_fs *c)
 		goto err;
 	}
 
-	if (!(c->opts.nochanges && c->opts.norecovery)) {
+	if (!c->opts.nochanges) {
 		mutex_lock(&c->sb_lock);
 		bool write_sb = false;
 
@@ -804,7 +805,7 @@ int bch2_fs_recovery(struct bch_fs *c)
 		if (bch2_check_version_downgrade(c)) {
 			struct printbuf buf = PRINTBUF;
 
-			prt_str(&buf, "Version downgrade required:\n");
+			prt_str(&buf, "Version downgrade required:");
 
 			__le64 passes = ext->recovery_passes_required[0];
 			bch2_sb_set_downgrade(c,
@@ -812,7 +813,7 @@ int bch2_fs_recovery(struct bch_fs *c)
 					BCH_VERSION_MINOR(c->sb.version));
 			passes = ext->recovery_passes_required[0] & ~passes;
 			if (passes) {
-				prt_str(&buf, "  running recovery passes: ");
+				prt_str(&buf, "\n  running recovery passes: ");
 				prt_bitflags(&buf, bch2_recovery_passes,
 					     bch2_recovery_passes_from_stable(le64_to_cpu(passes)));
 			}

fs/bcachefs/sb-members.c

@@ -421,7 +421,7 @@ void bch2_dev_errors_reset(struct bch_dev *ca)
 	m = bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx);
 	for (unsigned i = 0; i < ARRAY_SIZE(m->errors_at_reset); i++)
 		m->errors_at_reset[i] = cpu_to_le64(atomic64_read(&ca->errors[i]));
-	m->errors_reset_time = ktime_get_real_seconds();
+	m->errors_reset_time = cpu_to_le64(ktime_get_real_seconds());
 
 	bch2_write_super(c);
 	mutex_unlock(&c->sb_lock);

fs/bcachefs/super-io.c

@@ -717,7 +717,7 @@ static int __bch2_read_super(const char *path, struct bch_opts *opts,
 
 	if (IS_ERR(sb->bdev_handle)) {
 		ret = PTR_ERR(sb->bdev_handle);
-		goto out;
+		goto err;
 	}
 	sb->bdev = sb->bdev_handle->bdev;
 

fs/bcachefs/super.c

@@ -1428,10 +1428,10 @@ bool bch2_dev_state_allowed(struct bch_fs *c, struct bch_dev *ca,
 
 		required = max(!(flags & BCH_FORCE_IF_METADATA_DEGRADED)
 			       ? c->opts.metadata_replicas
-			       : c->opts.metadata_replicas_required,
+			       : metadata_replicas_required(c),
 			       !(flags & BCH_FORCE_IF_DATA_DEGRADED)
 			       ? c->opts.data_replicas
-			       : c->opts.data_replicas_required);
+			       : data_replicas_required(c));
 
 		return nr_rw >= required;
 	case BCH_MEMBER_STATE_failed: