linux-kernel - Re: [resend v1 1/5] block/genhd: Notify udev about capacity change

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Date:   Fri, 3 Jan 2020 06:16:39 +0000
From:   Chaitanya Kulkarni <Chaitanya.Kulkarni@....com>
To:     Balbir Singh <sblbir@...zon.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>
CC:     "axboe@...nel.dk" <axboe@...nel.dk>,
        "ssomesh@...zon.com" <ssomesh@...zon.com>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "hch@....de" <hch@....de>, "mst@...hat.com" <mst@...hat.com>
Subject: Re: [resend v1 1/5] block/genhd: Notify udev about capacity change

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@....de>
> Signed-off-by: Someswarudu Sangaraju<ssomesh@...zon.com>
> Signed-off-by: Balbir Singh<sblbir@...zon.com>
> ---

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