[PATCH 2/3] block/partitions: Support dynamic addition of partition checkers

[Takashi Iwai]

Add helper functions to add / remove the partition checker function
dynamically.  This also allows to move the partition checker code into
the driver itself, e.g. the blockconsole partition checker can be in a
part of blockconsole driver (even as a module).

Signed-off-by: Takashi Iwai <ti...@suse.de>
---
 block/partitions/check.c | 35 +++++++++++++++++++++++++++++++++++
 block/partitions/check.h |  8 ++++++++
 2 files changed, 43 insertions(+)

diff --git a/block/partitions/check.c b/block/partitions/check.c
index 21786ed..d71cb02 100644
--- a/block/partitions/check.c
+++ b/block/partitions/check.c
@@ -17,6 +17,7 @@
 #include <linux/vmalloc.h>
 #include <linux/ctype.h>
 #include <linux/genhd.h>
+#include <linux/export.h>
 
 #include "check.h"
 
@@ -110,6 +111,9 @@ static int (*check_part[])(struct parsed_partitions *) = {
        NULL
 };
 
+static DEFINE_MUTEX(check_part_mutex);
+static LIST_HEAD(check_part_list);
+
 static struct parsed_partitions *allocate_partitions(struct gendisk *hd)
 {
        struct parsed_partitions *state;
@@ -172,6 +176,21 @@ check_partition(struct gendisk *hd, struct block_device 
*bdev)
                }
 
        }
+
+       if (res <= 0) {
+               struct partition_checker *c;
+               mutex_lock(&check_part_mutex);
+               list_for_each_entry(c, &check_part_list, list) {
+                       memset(state->parts, 0, state->limit * 
sizeof(state->parts[0]));
+                       res = c->check(state);
+                       if (res < 0) {
+                               err = res;
+                               res = 0;
+                       }
+               }
+               mutex_unlock(&check_part_mutex);
+       }
+
        if (res > 0) {
                printk(KERN_INFO "%s", state->pp_buf);
 
@@ -194,3 +213,19 @@ check_partition(struct gendisk *hd, struct block_device 
*bdev)
        free_partitions(state);
        return ERR_PTR(res);
 }
+
+void append_partition_checker(struct partition_checker *c)
+{
+       mutex_lock(&check_part_mutex);
+       list_add_tail(&c->list, &check_part_list);
+       mutex_unlock(&check_part_mutex);
+}
+EXPORT_SYMBOL_GPL(append_partition_checker);
+
+void remove_partition_checker(struct partition_checker *c)
+{
+       mutex_lock(&check_part_mutex);
+       list_del(&c->list);
+       mutex_unlock(&check_part_mutex);
+}
+EXPORT_SYMBOL_GPL(remove_partition_checker);
diff --git a/block/partitions/check.h b/block/partitions/check.h
index bca9624..53c8508 100644
--- a/block/partitions/check.h
+++ b/block/partitions/check.h
@@ -55,3 +55,11 @@ extern int warn_no_part;
 #ifdef CONFIG_BLOCKCONSOLE
 int blockconsole_partition(struct parsed_partitions *state);
 #endif
+
+struct partition_checker {
+       int (*check)(struct parsed_partitions *);
+       struct list_head list;
+};
+
+void append_partition_checker(struct partition_checker *c);
+void remove_partition_checker(struct partition_checker *c);
-- 
1.8.1.4

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