waterDataFluctuationCorrelation preliminaryDataProcessing.c 张婷 commit at 2021-01-14

waterDataFluctuationCorrelation/monitoringDataProcessing/preliminaryDataProcessing.c

@@ -1648,3 +1648,121 @@ static inline int bio_check_eod(struct bio *bio, unsigned int nr_sectors)
 	sector_t maxsector;
 
 	if (!nr_sectors)
+		return 0;
+
+	/* Test device or partition size, when known. */
+	maxsector = i_size_read(bio->bi_bdev->bd_inode) >> 9;
+	if (maxsector) {
+		sector_t sector = bio->bi_sector;
+
+		if (maxsector < nr_sectors || maxsector - nr_sectors < sector) {
+			/*
+			 * This may well happen - the kernel calls bread()
+			 * without checking the size of the device, e.g., when
+			 * mounting a device.
+			 */
+			handle_bad_sector(bio);
+			return 1;
+		}
+	}
+
+	return 0;
+}
+
+static noinline_for_stack bool
+generic_make_request_checks(struct bio *bio)
+{
+	struct request_queue *q;
+	int nr_sectors = bio_sectors(bio);
+	int err = -EIO;
+	char b[BDEVNAME_SIZE];
+	struct hd_struct *part;
+
+	might_sleep();
+
+	if (bio_check_eod(bio, nr_sectors))
+		goto end_io;
+
+	q = bdev_get_queue(bio->bi_bdev);
+	if (unlikely(!q)) {
+		printk(KERN_ERR
+		       "generic_make_request: Trying to access "
+			"nonexistent block-device %s (%Lu)\n",
+			bdevname(bio->bi_bdev, b),
+			(long long) bio->bi_sector);
+		goto end_io;
+	}
+
+	if (likely(bio_is_rw(bio) &&
+		   nr_sectors > queue_max_hw_sectors(q))) {
+		printk(KERN_ERR "bio too big device %s (%u > %u)\n",
+		       bdevname(bio->bi_bdev, b),
+		       bio_sectors(bio),
+		       queue_max_hw_sectors(q));
+		goto end_io;
+	}
+
+	part = bio->bi_bdev->bd_part;
+	if (should_fail_request(part, bio->bi_size) ||
+	    should_fail_request(&part_to_disk(part)->part0,
+				bio->bi_size))
+		goto end_io;
+
+	/*
+	 * If this device has partitions, remap block n
+	 * of partition p to block n+start(p) of the disk.
+	 */
+	blk_partition_remap(bio);
+
+	if (bio_integrity_enabled(bio) && bio_integrity_prep(bio))
+		goto end_io;
+
+	if (bio_check_eod(bio, nr_sectors))
+		goto end_io;
+
+	/*
+	 * Filter flush bio's early so that make_request based
+	 * drivers without flush support don't have to worry
+	 * about them.
+	 */
+	if ((bio->bi_rw & (REQ_FLUSH | REQ_FUA)) && !q->flush_flags) {
+		bio->bi_rw &= ~(REQ_FLUSH | REQ_FUA);
+		if (!nr_sectors) {
+			err = 0;
+			goto end_io;
+		}
+	}
+
+	if ((bio->bi_rw & REQ_DISCARD) &&
+	    (!blk_queue_discard(q) ||
+	     ((bio->bi_rw & REQ_SECURE) && !blk_queue_secdiscard(q)))) {
+		err = -EOPNOTSUPP;
+		goto end_io;
+	}
+
+	if (bio->bi_rw & REQ_WRITE_SAME && !bdev_write_same(bio->bi_bdev)) {
+		err = -EOPNOTSUPP;
+		goto end_io;
+	}
+
+	/*
+	 * Various block parts want %current->io_context and lazy ioc
+	 * allocation ends up trading a lot of pain for a small amount of
+	 * memory.  Just allocate it upfront.  This may fail and block
+	 * layer knows how to live with it.
+	 */
+	create_io_context(GFP_ATOMIC, q->node);
+
+	if (blk_throtl_bio(q, bio))
+		return false;	/* throttled, will be resubmitted later */
+
+	trace_block_bio_queue(q, bio);
+	return true;
+
+end_io:
+	bio_endio(bio, err);
+	return false;
+}
+
+/**
+ * generic_make_request - hand a buffer to its device driver for I/O