bcachefs: Kill ERO in __bch2_i_sectors_acct()

We won't be root causing this in the immediate future, and it's fairly
innocuous - so just log it in the superblock.

koverstreet/bcachefs#869

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

Author: Kent Overstreet

fs/bcachefs/fs-io.c

@@ -144,10 +144,25 @@ int __must_check bch2_write_inode_size(struct bch_fs *c,
 void __bch2_i_sectors_acct(struct bch_fs *c, struct bch_inode_info *inode,
 			   struct quota_res *quota_res, s64 sectors)
 {
-	bch2_fs_inconsistent_on((s64) inode->v.i_blocks + sectors < 0, c,
-				"inode %lu i_blocks underflow: %llu + %lli < 0 (ondisk %lli)",
-				inode->v.i_ino, (u64) inode->v.i_blocks, sectors,
-				inode->ei_inode.bi_sectors);
+	if (unlikely((s64) inode->v.i_blocks + sectors < 0)) {
+		struct printbuf buf = PRINTBUF;
+		bch2_log_msg_start(c, &buf);
+		prt_printf(&buf, "inode %lu i_blocks underflow: %llu + %lli < 0 (ondisk %lli)",
+			   inode->v.i_ino, (u64) inode->v.i_blocks, sectors,
+			   inode->ei_inode.bi_sectors);
+
+		bool repeat = false, print = false, suppress = false;
+		bch2_count_fsck_err(c, vfs_inode_i_blocks_underflow, buf.buf, &repeat, &print, &suppress);
+		if (print)
+			bch2_print_str(c, buf.buf);
+		printbuf_exit(&buf);
+
+		if (sectors < 0)
+			sectors = -inode->v.i_blocks;
+		else
+			sectors = 0;
+	}
+
 	inode->v.i_blocks += sectors;
 
 #ifdef CONFIG_BCACHEFS_QUOTA

fs/bcachefs/sb-errors_format.h

@@ -236,6 +236,7 @@ enum bch_fsck_flags {
 	x(inode_has_child_snapshots_wrong,			287,	0)		\
 	x(inode_unreachable,					210,	FSCK_AUTOFIX)	\
 	x(inode_journal_seq_in_future,				299,	FSCK_AUTOFIX)	\
+	x(vfs_inode_i_blocks_underflow,				311,	FSCK_AUTOFIX)	\
 	x(deleted_inode_but_clean,				211,	FSCK_AUTOFIX)	\
 	x(deleted_inode_missing,				212,	FSCK_AUTOFIX)	\
 	x(deleted_inode_is_dir,					213,	FSCK_AUTOFIX)	\
@@ -317,7 +318,9 @@ enum bch_fsck_flags {
 	x(directory_size_mismatch,				303,	FSCK_AUTOFIX)	\
 	x(dirent_cf_name_too_big,				304,	0)		\
 	x(dirent_stray_data_after_cf_name,			305,	0)		\
-	x(MAX,							308,	0)
+	x(rebalance_work_incorrectly_set,			309,	FSCK_AUTOFIX)	\
+	x(rebalance_work_incorrectly_unset,			310,	FSCK_AUTOFIX)	\
+	x(MAX,							312,	0)
 
 enum bch_sb_error_id {
 #define x(t, n, ...) BCH_FSCK_ERR_##t = n,