Assorted debug and fsck improvements

This adds a new list mode to "bcachefs list", for printing out nodes as
they exist on disk (before being merge sorted). Also some improvements
to fsck return values.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>

cmd_debug.c

@@ -11,8 +11,10 @@
 #include "libbcachefs/bcachefs.h"
 #include "libbcachefs/bset.h"
 #include "libbcachefs/btree_cache.h"
+#include "libbcachefs/btree_io.h"
 #include "libbcachefs/btree_iter.h"
 #include "libbcachefs/buckets.h"
+#include "libbcachefs/checksum.h"
 #include "libbcachefs/error.h"
 #include "libbcachefs/journal.h"
 #include "libbcachefs/journal_io.h"
@@ -237,6 +239,125 @@ static void list_nodes(struct bch_fs *c, enum btree_id btree_id,
 	bch2_trans_exit(&trans);
 }
 
+static void print_node_ondisk(struct bch_fs *c, struct btree *b)
+{
+	struct btree_node *n_ondisk;
+	struct extent_ptr_decoded pick;
+	struct bch_dev *ca;
+	struct bio *bio;
+	unsigned offset = 0;
+
+	if (bch2_bkey_pick_read_device(c, bkey_i_to_s_c(&b->key), NULL, &pick) <= 0) {
+		printf("error getting device to read from\n");
+		return;
+	}
+
+	ca = bch_dev_bkey_exists(c, pick.ptr.dev);
+	if (!bch2_dev_get_ioref(ca, READ)) {
+		printf("error getting device to read from\n");
+		return;
+	}
+
+	n_ondisk = malloc(btree_bytes(c));
+
+	bio = bio_alloc_bioset(GFP_NOIO,
+			buf_pages(n_ondisk, btree_bytes(c)),
+			&c->btree_bio);
+	bio_set_dev(bio, ca->disk_sb.bdev);
+	bio->bi_opf		= REQ_OP_READ|REQ_META;
+	bio->bi_iter.bi_sector	= pick.ptr.offset;
+	bch2_bio_map(bio, n_ondisk, btree_bytes(c));
+
+	submit_bio_wait(bio);
+
+	bio_put(bio);
+	percpu_ref_put(&ca->io_ref);
+
+	while (offset < c->opts.btree_node_size) {
+		struct bset *i;
+		struct nonce nonce;
+		struct bch_csum csum;
+		struct bkey_packed *k;
+		unsigned sectors;
+
+		if (!offset) {
+			i = &n_ondisk->keys;
+
+			if (!bch2_checksum_type_valid(c, BSET_CSUM_TYPE(i)))
+				die("unknown checksum type");
+
+			nonce = btree_nonce(i, offset << 9);
+			csum = csum_vstruct(c, BSET_CSUM_TYPE(i), nonce, n_ondisk);
+
+			if (bch2_crc_cmp(csum, n_ondisk->csum))
+				die("invalid checksum\n");
+
+			bset_encrypt(c, i, offset << 9);
+
+			sectors = vstruct_sectors(n_ondisk, c->block_bits);
+		} else {
+			struct btree_node_entry *bne = (void *) n_ondisk + (offset << 9);
+
+			i = &bne->keys;
+
+			if (i->seq != n_ondisk->keys.seq)
+				break;
+
+			if (!bch2_checksum_type_valid(c, BSET_CSUM_TYPE(i)))
+				die("unknown checksum type");
+
+			nonce = btree_nonce(i, offset << 9);
+			csum = csum_vstruct(c, BSET_CSUM_TYPE(i), nonce, bne);
+
+			if (bch2_crc_cmp(csum, bne->csum))
+				die("invalid checksum");
+
+			bset_encrypt(c, i, offset << 9);
+
+			sectors = vstruct_sectors(bne, c->block_bits);
+		}
+
+		fprintf(stdout, "  offset %u journal seq %llu\n",
+			offset, le64_to_cpu(i->journal_seq));
+		offset += sectors;
+
+		for (k = i->start;
+		     k != vstruct_last(i);
+		     k = bkey_next_skip_noops(k, vstruct_last(i))) {
+			struct bkey u;
+			char buf[4096];
+
+			bch2_bkey_val_to_text(&PBUF(buf), c, bkey_disassemble(b, k, &u));
+			fprintf(stdout, "    %s\n", buf);
+		}
+	}
+
+	free(n_ondisk);
+}
+
+static void list_nodes_ondisk(struct bch_fs *c, enum btree_id btree_id,
+			      struct bpos start, struct bpos end)
+{
+	struct btree_trans trans;
+	struct btree_iter *iter;
+	struct btree *b;
+	char buf[4096];
+
+	bch2_trans_init(&trans, c, 0, 0);
+
+	for_each_btree_node(&trans, iter, btree_id, start, 0, b) {
+		if (bkey_cmp(b->key.k.p, end) > 0)
+			break;
+
+		bch2_bkey_val_to_text(&PBUF(buf), c, bkey_i_to_s_c(&b->key));
+		fputs(buf, stdout);
+		putchar('\n');
+
+		print_node_ondisk(c, b);
+	}
+	bch2_trans_exit(&trans);
+}
+
 static void list_nodes_keys(struct bch_fs *c, enum btree_id btree_id,
 			    struct bpos start, struct bpos end)
 {
@@ -306,6 +427,7 @@ static const char * const list_modes[] = {
 	"keys",
 	"formats",
 	"nodes",
+	"nodes_ondisk",
 	"nodes_keys",
 	NULL
 };
@@ -383,6 +505,9 @@ int cmd_list(int argc, char *argv[])
 			list_nodes(c, btree_id, start, end);
 			break;
 		case 3:
+			list_nodes_ondisk(c, btree_id, start, end);
+			break;
+		case 4:
 			list_nodes_keys(c, btree_id, start, end);
 			break;
 		default:

cmd_fsck.c

@@ -67,25 +67,36 @@ int cmd_fsck(int argc, char *argv[])
 			break;
 		case 'h':
 			usage();
-			exit(EXIT_SUCCESS);
+			exit(16);
 		}
 	args_shift(optind);
 
-	if (!argc)
-		die("Please supply device(s) to check");
+	if (!argc) {
+		fprintf(stderr, "Please supply device(s) to check\n");
+		exit(8);
+	}
 
-	for (i = 0; i < argc; i++)
-		if (dev_mounted_rw(argv[i]))
-			die("%s is mounted read-write - aborting", argv[i]);
+	for (i = 0; i < argc; i++) {
+		switch (dev_mounted(argv[i])) {
+		case 1:
+			ret |= 2;
+			break;
+		case 2:
+			fprintf(stderr, "%s is mounted read-write - aborting\n", argv[i]);
+			exit(8);
+		}
+	}
 
 	struct bch_fs *c = bch2_fs_open(argv, argc, opts);
-	if (IS_ERR(c))
-		die("error opening %s: %s", argv[0], strerror(-PTR_ERR(c)));
+	if (IS_ERR(c)) {
+		fprintf(stderr, "error opening %s: %s\n", argv[0], strerror(-PTR_ERR(c)));
+		exit(8);
+	}
 
 	if (test_bit(BCH_FS_ERRORS_FIXED, &c->flags))
-		ret = 2;
+		ret |= 1;
 	if (test_bit(BCH_FS_ERROR, &c->flags))
-		ret = 4;
+		ret |= 4;
 
 	bch2_fs_stop(c);
 	return ret;

libbcachefs.c

@@ -21,6 +21,7 @@
 #include "libbcachefs/btree_cache.h"
 #include "libbcachefs/checksum.h"
 #include "libbcachefs/disk_groups.h"
+#include "libbcachefs/journal_seq_blacklist.h"
 #include "libbcachefs/opts.h"
 #include "libbcachefs/replicas.h"
 #include "libbcachefs/super-io.h"
@@ -623,6 +624,17 @@ static void bch2_sb_print_clean(struct bch_sb *sb, struct bch_sb_field *f,
 static void bch2_sb_print_journal_seq_blacklist(struct bch_sb *sb, struct bch_sb_field *f,
 				enum units units)
 {
+	struct bch_sb_field_journal_seq_blacklist *bl = field_to_type(f, journal_seq_blacklist);
+	unsigned i, nr = blacklist_nr_entries(bl);
+
+	for (i = 0; i < nr; i++) {
+		struct journal_seq_blacklist_entry *e =
+			bl->start + i;
+
+		printf("  %llu-%llu\n",
+		       le64_to_cpu(e->start),
+		       le64_to_cpu(e->end));
+	}
 }
 
 typedef void (*sb_field_print_fn)(struct bch_sb *, struct bch_sb_field *, enum units);
@@ -1040,7 +1052,9 @@ struct bch_opts bch2_parse_opts(struct bch_opt_strs strs)
 		ret = bch2_opt_parse(NULL, &bch2_opt_table[i],
 				     strs.by_id[i], &v);
 		if (ret < 0)
-			die("Invalid %s: %s", strs.by_id[i], strerror(-ret));
+			die("Invalid %s: %s",
+			    bch2_opt_table[i].attr.name,
+			    strerror(-ret));
 
 		bch2_opt_set_by_id(&opts, i, v);
 	}

mount/src/libbcachefs_wrapper.h

@@ -1,4 +1,4 @@
-#include <libbcachefs/super-io.h>
-#include <libbcachefs/checksum.h>
-#include <libbcachefs/bcachefs_format.h>
-#include <crypto.h>
+#include "../libbcachefs/super-io.h"
+#include "../libbcachefs/checksum.h"
+#include "../libbcachefs/bcachefs_format.h"
+#include "../crypto.h"

tools-util.c

@@ -653,9 +653,13 @@ found:
 	return ret;
 }
 
-bool dev_mounted_rw(char *dev)
+int dev_mounted(char *dev)
 {
 	struct mntent *mnt = dev_to_mount(dev);
 
-	return mnt && !hasmntopt(mnt, "ro");
+	if (!mnt)
+		return 0;
+	if (hasmntopt(mnt, "ro"))
+		return 1;
+	return 2;
 }

tools-util.h

@@ -155,7 +155,7 @@ u32 crc32c(u32, const void *, size_t);
 char *dev_to_name(dev_t);
 char *dev_to_path(dev_t);
 struct mntent *dev_to_mount(char *);
-bool dev_mounted_rw(char *);
+int dev_mounted(char *);
 
 #define args_shift(_nr)							\
 do {									\