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Date: Wed, 05 Mar 2008 20:46:10 +0300
From: Pavel Emelyanov <xemul@...nvz.org>
To: Pavel Emelyanov <xemul@...nvz.org>
CC: Andrew Morton <akpm@...ux-foundation.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Paul Menage <menage@...gle.com>,
Sukadev Bhattiprolu <sukadev@...ibm.com>,
Serge Hallyn <serue@...ibm.com>
Subject: [PATCH 8/9] Provide functions to manipulate block device mappings
This routines were already done for char devices, these ones
are for block devices. Everything is the same, but the locks,
probe and match callbacks and kobj-to-device conversions.
Signed-off-by: Pavel Emelyanov <xemul@...nvz.org>
---
block/genhd.c | 67 +++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/genhd.h | 8 ++++++
2 files changed, 75 insertions(+), 0 deletions(-)
diff --git a/block/genhd.c b/block/genhd.c
index a619158..f407f62 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -204,6 +204,73 @@ void unlink_gendisk(struct gendisk *disk)
disk->minors);
}
+#ifdef CONFIG_CGROUP_DEVS
+int bdev_add_to_map(struct kobj_map *map, dev_t dev, int all, mode_t mode)
+{
+ int tmp;
+ struct kobject *kobj;
+ struct device *d;
+ struct gendisk *disk;
+
+ kobj = kobj_lookup(bdev_map, dev, NULL, &tmp);
+ if (kobj == NULL)
+ return -ENODEV;
+
+ d = kobj_to_dev(kobj);
+ disk = dev_to_disk(d);
+ tmp = kobj_remap(map, dev, mode, all ? MINORBITS : 1, NULL,
+ exact_match, exact_lock, disk);
+ if (tmp < 0) {
+ put_disk(disk);
+ return tmp;
+ }
+
+ return 0;
+}
+
+int bdev_del_from_map(struct kobj_map *map, dev_t dev, int all)
+{
+ int tmp;
+ struct kobject *kobj;
+ struct device *d;
+ struct gendisk *disk;
+
+ kobj = kobj_lookup(map, dev, NULL, &tmp);
+ if (kobj == NULL)
+ return -ENODEV;
+
+ d = kobj_to_dev(kobj);
+ disk = dev_to_disk(d);
+ kobj_unmap(map, dev, all ? MINORBITS : 1);
+
+ /*
+ * one put for the kobj_lookup above and one for
+ * the kobj_lookup in bdev_add_to_map
+ */
+ put_disk(disk);
+ put_disk(disk);
+ return 0;
+}
+
+void bdev_iterate_map(struct kobj_map *map,
+ int (*fn)(dev_t, int, mode_t, void *), void *x)
+{
+ kobj_map_iterate(map, fn, x);
+}
+
+static struct kobject *base_probe(dev_t devt, int *part, void *data);
+
+struct kobj_map *bdev_map_init(void)
+{
+ return kobj_map_init(base_probe, &block_class_lock);
+}
+
+void bdev_map_fini(struct kobj_map *map)
+{
+ kobj_map_fini(map);
+}
+#endif
+
/**
* get_gendisk - get partitioning information for a given device
* @dev: device to get partitioning information for
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index e09df44..c5483fc 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -373,6 +373,14 @@ extern void del_gendisk(struct gendisk *gp);
extern void unlink_gendisk(struct gendisk *gp);
extern struct gendisk *get_gendisk(dev_t dev, mode_t *mode, int *part);
+struct kobj_map;
+extern int bdev_add_to_map(struct kobj_map *, dev_t dev, int all, mode_t mode);
+extern int bdev_del_from_map(struct kobj_map *map, dev_t dev, int all);
+extern void bdev_iterate_map(struct kobj_map *map,
+ int (*fn)(dev_t, int, mode_t, void *), void *x);
+extern struct kobj_map *bdev_map_init(void);
+extern void bdev_map_fini(struct kobj_map *map);
+
extern void set_device_ro(struct block_device *bdev, int flag);
extern void set_disk_ro(struct gendisk *disk, int flag);
--
1.5.3.4
--
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