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block: remove i_bdev

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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>
This commit is contained in:
Christoph Hellwig
2020-11-23 13:38:40 +01:00
committed by Jens Axboe
parent 7918f0f6fd
commit 4e7b5671c6
18 changed files with 121 additions and 252 deletions
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44
fs/super.c
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@@ -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);
@@ -776,19 +777,6 @@ rescan:
return NULL;
}
/**
* 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);