On 01/01/2020 11:53 PM, Balbir Singh wrote:

Allow block/genhd to notify user space (via udev) about disk size changes
using a new helper disk_set_capacity(), which is a wrapper on top
of set_capacity(). disk_set_capacity() will only notify via udev if
the current capacity or the target capacity is not zero.

Suggested-by: Christoph Hellwig<hch@lst.de>
Signed-off-by: Someswarudu Sangaraju<redacted>
Signed-off-by: Balbir Singh<redacted>
---

Since disk_set_capacity(() is on the same line as set_capacity()
we should follow the same convention, which is :-

1. Avoid exporting symbol.
2. Mark new function in-line.

Unless there is a very specific reason for breaking the pattern.

Why not this (totally untested but easy convey above comment)
on the top of this patch ?

# git diff

diff --git a/block/genhd.c b/block/genhd.c
index 94faec98607b..ff6268970ddc 100644
--- a/block/genhd.c
+++ b/block/genhd.c

@@ -46,25 +46,6 @@ static void disk_add_events(struct gendisk *disk);
  static void disk_del_events(struct gendisk *disk);
  static void disk_release_events(struct gendisk *disk);

-/*
- * Set disk capacity and notify if the size is not currently
- * zero and will not be set to zero
- */
-void disk_set_capacity(struct gendisk *disk, sector_t size)
-{
-       sector_t capacity = get_capacity(disk);
-
-       set_capacity(disk, size);
-       if (capacity != 0 && size != 0) {
-               char *envp[] = { "RESIZE=1", NULL };
-
-               kobject_uevent_env(&disk_to_dev(disk)->kobj, 

KOBJ_CHANGE, envp);
-       }
-}
-
-EXPORT_SYMBOL_GPL(disk_set_capacity);
-
-
  void part_inc_in_flight(struct request_queue *q, struct hd_struct 
*part, int rw)
  {
         if (queue_is_mq(q))

diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index d5e87d7cc357..5e595a28f893 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h

@@ -469,6 +469,22 @@ static inline void set_capacity(struct gendisk 

*disk, sector_t size)
         disk->part0.nr_sects = size;
  }

+/*
+ * Set disk capacity and notify if the size is not currently
+ * zero and will not be set to zero
+ */
+static inline void disk_set_capacity(struct gendisk *disk, sector_t size)
+{
+       sector_t capacity = get_capacity(disk);
+
+       set_capacity(disk, size);
+       if (capacity != 0 && size != 0) {
+               char *envp[] = { "RESIZE=1", NULL };
+
+               kobject_uevent_env(&disk_to_dev(disk)->kobj, 
KOBJ_CHANGE, envp);
+       }
+}
+
  #ifdef CONFIG_SOLARIS_X86_PARTITION