Merge tag 'zonefs-6.2-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/dlemoal/zonefs

Pull zonefs fix from Damien Le Moal:

 - A single patch to fix sync write operations to detect and handle
   errors due to external zone corruptions resulting in writes at
   invalid location, from me.

* tag 'zonefs-6.2-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/dlemoal/zonefs:
  zonefs: Detect append writes at invalid locations

Author: torvalds

fs/zonefs/super.c

@@ -442,6 +442,10 @@ static int zonefs_io_error_cb(struct blk_zone *zone, unsigned int idx,
 			data_size = zonefs_check_zone_condition(inode, zone,
 								false, false);
 		}
+	} else if (sbi->s_mount_opts & ZONEFS_MNTOPT_ERRORS_RO &&
+		   data_size > isize) {
+		/* Do not expose garbage data */
+		data_size = isize;
 	}
 
 	/*
@@ -805,6 +809,24 @@ static ssize_t zonefs_file_dio_append(struct kiocb *iocb, struct iov_iter *from)
 
 	ret = submit_bio_wait(bio);
 
+	/*
+	 * If the file zone was written underneath the file system, the zone
+	 * write pointer may not be where we expect it to be, but the zone
+	 * append write can still succeed. So check manually that we wrote where
+	 * we intended to, that is, at zi->i_wpoffset.
+	 */
+	if (!ret) {
+		sector_t wpsector =
+			zi->i_zsector + (zi->i_wpoffset >> SECTOR_SHIFT);
+
+		if (bio->bi_iter.bi_sector != wpsector) {
+			zonefs_warn(inode->i_sb,
+				"Corrupted write pointer %llu for zone at %llu\n",
+				wpsector, zi->i_zsector);
+			ret = -EIO;
+		}
+	}
+
 	zonefs_file_write_dio_end_io(iocb, size, ret, 0);
 	trace_zonefs_file_dio_append(inode, size, ret);