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authorChristoph Hellwig <hch@lst.de>2020-11-23 15:38:40 +0300
committerJens Axboe <axboe@kernel.dk>2020-12-02 00:53:39 +0300
commit4e7b5671c6a883d94b5428e1a9c141bbd56cb2a6 (patch)
tree862980514dedf92e87aa3ec651f5be306f207390 /fs/super.c
parent7918f0f6fdafa1e52c2d77c537cb55ef25fb69a3 (diff)
downloadlinux-4e7b5671c6a883d94b5428e1a9c141bbd56cb2a6.tar.xz
block: remove i_bdev
Switch the block device lookup interfaces to directly work with a dev_t so that struct block_device references are only acquired by the blkdev_get variants (and the blk-cgroup special case). This means that we now don't need an extra reference in the inode and can generally simplify handling of struct block_device to keep the lookups contained in the core block layer code. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jan Kara <jack@suse.cz> Reviewed-by: Hannes Reinecke <hare@suse.de> Acked-by: Tejun Heo <tj@kernel.org> Acked-by: Coly Li <colyli@suse.de> [bcache] Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs/super.c')
-rw-r--r--fs/super.c44
1 files changed, 19 insertions, 25 deletions
diff --git a/fs/super.c b/fs/super.c
index 343e5c1e538d..2c6cdea2ab2d 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -740,7 +740,14 @@ void iterate_supers_type(struct file_system_type *type,
EXPORT_SYMBOL(iterate_supers_type);
-struct super_block *__get_super(struct block_device *bdev, bool excl)
+/**
+ * get_super - get the superblock of a device
+ * @bdev: device to get the superblock for
+ *
+ * Scans the superblock list and finds the superblock of the file system
+ * mounted on the device given. %NULL is returned if no match is found.
+ */
+struct super_block *get_super(struct block_device *bdev)
{
struct super_block *sb;
@@ -755,17 +762,11 @@ rescan:
if (sb->s_bdev == bdev) {
sb->s_count++;
spin_unlock(&sb_lock);
- if (!excl)
- down_read(&sb->s_umount);
- else
- down_write(&sb->s_umount);
+ down_read(&sb->s_umount);
/* still alive? */
if (sb->s_root && (sb->s_flags & SB_BORN))
return sb;
- if (!excl)
- up_read(&sb->s_umount);
- else
- up_write(&sb->s_umount);
+ up_read(&sb->s_umount);
/* nope, got unmounted */
spin_lock(&sb_lock);
__put_super(sb);
@@ -777,19 +778,6 @@ rescan:
}
/**
- * get_super - get the superblock of a device
- * @bdev: device to get the superblock for
- *
- * Scans the superblock list and finds the superblock of the file system
- * mounted on the device given. %NULL is returned if no match is found.
- */
-struct super_block *get_super(struct block_device *bdev)
-{
- return __get_super(bdev, false);
-}
-EXPORT_SYMBOL(get_super);
-
-/**
* get_active_super - get an active reference to the superblock of a device
* @bdev: device to get the superblock for
*
@@ -820,7 +808,7 @@ restart:
return NULL;
}
-struct super_block *user_get_super(dev_t dev)
+struct super_block *user_get_super(dev_t dev, bool excl)
{
struct super_block *sb;
@@ -832,11 +820,17 @@ rescan:
if (sb->s_dev == dev) {
sb->s_count++;
spin_unlock(&sb_lock);
- down_read(&sb->s_umount);
+ if (excl)
+ down_write(&sb->s_umount);
+ else
+ down_read(&sb->s_umount);
/* still alive? */
if (sb->s_root && (sb->s_flags & SB_BORN))
return sb;
- up_read(&sb->s_umount);
+ if (excl)
+ up_write(&sb->s_umount);
+ else
+ up_read(&sb->s_umount);
/* nope, got unmounted */
spin_lock(&sb_lock);
__put_super(sb);