bcachefs: create lost+found when initializing fs

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

1 files changed, 43 insertions, 11 deletions

diff --git a/fs/bcachefs/recovery.c b/fs/bcachefs/recovery.c
index 58aee7aeef82..f7c138d274e0 100644
--- a/fs/bcachefs/recovery.c
+++ b/fs/bcachefs/recovery.c
@@ -5,6 +5,7 @@
 #include "btree_update.h"
 #include "btree_update_interior.h"
 #include "btree_io.h"
+#include "dirent.h"
 #include "error.h"
 #include "fsck.h"
 #include "journal_io.h"
@@ -14,6 +15,8 @@
 
 #include <linux/stat.h>
 
+#define QSTR(n) { { { .len = strlen(n) } }, .name = n }
+
 struct bkey_i *btree_root_find(struct bch_fs *c,
 			       struct bch_sb_field_clean *clean,
 			       struct jset *j,
@@ -233,7 +236,8 @@ int bch2_fs_recovery(struct bch_fs *c)
 	bch2_fs_journal_start(&c->journal);
 
 	err = "error starting allocator";
-	if (bch2_fs_allocator_start(c))
+	ret = bch2_fs_allocator_start(c);
+	if (ret)
 		goto err;
 
 	bch_verbose(c, "starting journal replay:");
@@ -273,8 +277,10 @@ fsck_err:
 
 int bch2_fs_initialize(struct bch_fs *c)
 {
-	struct bch_inode_unpacked inode;
+	struct bch_inode_unpacked root_inode, lostfound_inode;
 	struct bkey_inode_buf packed_inode;
+	struct bch_hash_info root_hash_info;
+	struct qstr lostfound = QSTR("lost+found");
 	const char *err = "cannot allocate memory";
 	struct bch_dev *ca;
 	LIST_HEAD(journal);
@@ -307,21 +313,46 @@ int bch2_fs_initialize(struct bch_fs *c)
 	bch2_journal_set_replay_done(&c->journal);
 
 	err = "error starting allocator";
-	if (bch2_fs_allocator_start(c))
+	ret = bch2_fs_allocator_start(c);
+	if (ret)
 		goto err;
 
-	bch2_inode_init(c, &inode, 0, 0,
+	bch2_inode_init(c, &root_inode, 0, 0,
 			S_IFDIR|S_IRWXU|S_IRUGO|S_IXUGO, 0, NULL);
-	inode.bi_inum = BCACHEFS_ROOT_INO;
-
-	bch2_inode_pack(&packed_inode, &inode);
+	root_inode.bi_inum = BCACHEFS_ROOT_INO;
+	root_inode.bi_nlink++; /* lost+found */
+	bch2_inode_pack(&packed_inode, &root_inode);
 
 	err = "error creating root directory";
-	if (bch2_btree_insert(c, BTREE_ID_INODES,
-			      &packed_inode.inode.k_i,
-			      NULL, NULL, NULL, 0))
+	ret = bch2_btree_insert(c, BTREE_ID_INODES,
+				&packed_inode.inode.k_i,
+				NULL, NULL, NULL, 0);
+	if (ret)
 		goto err;
 
+	bch2_inode_init(c, &lostfound_inode, 0, 0,
+			S_IFDIR|S_IRWXU|S_IRUGO|S_IXUGO, 0,
+			&root_inode);
+	lostfound_inode.bi_inum = BCACHEFS_ROOT_INO + 1;
+	bch2_inode_pack(&packed_inode, &lostfound_inode);
+
+	err = "error creating lost+found";
+	ret = bch2_btree_insert(c, BTREE_ID_INODES,
+				&packed_inode.inode.k_i,
+				NULL, NULL, NULL, 0);
+	if (ret)
+		goto err;
+
+	root_hash_info = bch2_hash_info_init(c, &root_inode);
+
+	ret = bch2_dirent_create(c, BCACHEFS_ROOT_INO, &root_hash_info, DT_DIR,
+				 &lostfound, lostfound_inode.bi_inum, NULL,
+				 BTREE_INSERT_NOFAIL);
+	if (ret)
+		goto err;
+
+	atomic_long_set(&c->nr_inodes, 2);
+
 	if (enabled_qtypes(c)) {
 		ret = bch2_fs_quota_read(c);
 		if (ret)
@@ -329,7 +360,8 @@ int bch2_fs_initialize(struct bch_fs *c)
 	}
 
 	err = "error writing first journal entry";
-	if (bch2_journal_meta(&c->journal))
+	ret = bch2_journal_meta(&c->journal);
+	if (ret)
 		goto err;
 
 	mutex_lock(&c->sb_lock);