block: fix partition info printouts

Recent block_class iteration updates 5c6f35c5..27f3025 broke partition
info printouts.

* printk_all_partitions(): Partition print out stops when it meets a
  partition hole.  Partition printing inner loop should continue
  instead of exiting on empty partition slot.

* /proc/partitions and /proc/diskstats: If all information can't be
  read in single read(), the information is truncated.  This is
  because find_start() doesn't actually update the counter containing
  the initial seek.  It runs to the end and ends up always reporting
  EOF on the second read.

This patch fixes both problems.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

diff --git a/block/genhd.c b/block/genhd.c
index c114a43..0be9513 100644 (file)
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -236,7 +236,7 @@ static int printk_partition(struct device *dev, void *data)
        int n;
 
        if (dev->type != &disk_type)
-               goto exit;
+               return 0;
 
        sgp = dev_to_disk(dev);
        /*
@@ -244,7 +244,7 @@ static int printk_partition(struct device *dev, void *data)
         */
        if (get_capacity(sgp) == 0 ||
            (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO))
-               goto exit;
+               return 0;
 
        /*
         * Note, unlike /proc/partitions, I am showing the numbers in
@@ -264,15 +264,15 @@ static int printk_partition(struct device *dev, void *data)
        /* now show the partitions */
        for (n = 0; n < sgp->minors - 1; ++n) {
                if (sgp->part[n] == NULL)
-                       goto exit;
+                       continue;
                if (sgp->part[n]->nr_sects == 0)
-                       goto exit;
+                       continue;
                printk("  %02x%02x %10llu %s\n",
                        sgp->major, n + 1 + sgp->first_minor,
                        (unsigned long long)sgp->part[n]->nr_sects >> 1,
                        disk_name(sgp, n + 1, buf));
        }
-exit:
+
        return 0;
 }