[PATCH 3/5] block: move rescan_partitions to fs/block_dev.c

Christoph Hellwig
2019-11-06T15:14:49Z

Large parts of rescan_partitions aren't about partitions, and
moving it to block_dev.c will allow for some further cleanups by
merging it into its only caller.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
block/partition-generic.c | 37 ++-----------------------------------
fs/block_dev.c | 38 ++++++++++++++++++++++++++++++++++++--
include/linux/fs.h | 2 --
include/linux/genhd.h | 4 ++--
4 files changed, 40 insertions(+), 41 deletions(-)

diff --git a/block/partition-generic.c b/block/partition-generic.c
index eae9daa8a523..7a6e406ac490 100644
--- a/block/partition-generic.c
+++ b/block/partition-generic.c
@@ -439,7 +439,7 @@ static bool disk_unlock_native_capacity(struct gendisk *disk)
}
}

-static int drop_partitions(struct gendisk *disk, struct block_device *bdev)
+int blk_drop_partitions(struct gendisk *disk, struct block_device *bdev)
{
struct disk_part_iter piter;
struct hd_struct *part;
@@ -573,7 +573,7 @@ static bool blk_add_partition(struct gendisk *disk, struct block_device *bdev,
return true;
}

-static int blk_add_partitions(struct gendisk *disk, struct block_device *bdev)
+int blk_add_partitions(struct gendisk *disk, struct block_device *bdev)
{
struct parsed_partitions *state;
int ret = -EAGAIN, p, highest;
@@ -632,39 +632,6 @@ static int blk_add_partitions(struct gendisk *disk, struct block_device *bdev)
return ret;
}

-int rescan_partitions(struct gendisk *disk, struct block_device *bdev,
- bool invalidate)
-{
- int ret;
-
-rescan:
- ret = drop_partitions(disk, bdev);
- if (ret)
- return ret;
-
- if (invalidate)
- set_capacity(disk, 0);
- else if (disk->fops->revalidate_disk)
- disk->fops->revalidate_disk(disk);
-
- check_disk_size_change(disk, bdev, !invalidate);
- bdev->bd_invalidated = 0;
-
- if (!get_capacity(disk)) {
- /*
- * Tell userspace that the media / partition table may have
- * changed.
- */
- kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
- return 0;
- }
-
- ret = blk_add_partitions(disk, bdev);
- if (ret == -EAGAIN)
- goto rescan;
- return ret;
-}
-
unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p)
{
struct address_space *mapping = bdev->bd_inode->i_mapping;
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 0af62b76d031..f0710085e1f1 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1416,8 +1416,8 @@ static void flush_disk(struct block_device *bdev, bool kill_dirty)
* and adjusts it if it differs. When shrinking the bdev size, its all caches
* are freed.
*/
-void check_disk_size_change(struct gendisk *disk, struct block_device *bdev,
- bool verbose)
+static void check_disk_size_change(struct gendisk *disk,
+ struct block_device *bdev, bool verbose)
{
loff_t disk_size, bdev_size;

@@ -1508,6 +1508,40 @@ EXPORT_SYMBOL(bd_set_size);

static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part);

+static int rescan_partitions(struct gendisk *disk, struct block_device *bdev,
+ bool invalidate)
+{
+ int ret;
+
+rescan:
+ ret = blk_drop_partitions(disk, bdev);
+ if (ret)
+ return ret;
+
+ if (invalidate)
+ set_capacity(disk, 0);
+ else if (disk->fops->revalidate_disk)
+ disk->fops->revalidate_disk(disk);
+
+ check_disk_size_change(disk, bdev, !invalidate);
+ bdev->bd_invalidated = 0;
+
+ if (!get_capacity(disk)) {
+ /*
+ * Tell userspace that the media / partition table may have
+ * changed.
+ */
+ kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
+ return 0;
+ }
+
+ ret = blk_add_partitions(disk, bdev);
+ if (ret == -EAGAIN)
+ goto rescan;
+ return ret;
+}
+
+
static void bdev_disk_changed(struct block_device *bdev, bool invalidate)
{
if (disk_part_scan_enabled(bdev->bd_disk)) {
diff --git a/include/linux/fs.h b/include/linux/fs.h
index e0d909d35763..d233dd661df7 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2703,8 +2703,6 @@ extern void make_bad_inode(struct inode *);
extern bool is_bad_inode(struct inode *);

#ifdef CONFIG_BLOCK
-extern void check_disk_size_change(struct gendisk *disk,
- struct block_device *bdev, bool verbose);
extern int revalidate_disk(struct gendisk *);
extern int check_disk_change(struct block_device *);
extern int __invalidate_device(struct block_device *, bool);
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index fd7774e64f0b..f5cffbf63abf 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -621,9 +621,9 @@ extern void blk_invalidate_devt(dev_t devt);
extern dev_t blk_lookup_devt(const char *name, int partno);
extern char *disk_name (struct gendisk *hd, int partno, char *buf);

+int blk_add_partitions(struct gendisk *disk, struct block_device *bdev);
+int blk_drop_partitions(struct gendisk *disk, struct block_device *bdev);
extern int disk_expand_part_tbl(struct gendisk *disk, int target);
-int rescan_partitions(struct gendisk *disk, struct block_device *bdev,
- bool invalidate);
extern struct hd_struct * __must_check add_partition(struct gendisk *disk,
int partno, sector_t start,
sector_t len, int flags,
--
2.20.1