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block_device: add a pointer to struct address_space (page cache of bdev)

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points to ->i_data of coallocated inode.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Link: https://lore.kernel.org/r/20240411145346.2516848-1-viro@zeniv.linux.org.uk
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Al Viro 2024-04-11 15:53:36 +01:00
parent a09cd552e0
commit e33aef2c58
2 changed files with 2 additions and 0 deletions
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1
block/bdev.c
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@ -419,6 +419,7 @@ struct block_device *bdev_alloc(struct gendisk *disk, u8 partno)
mutex_init(&bdev->bd_holder_lock);
bdev->bd_partno = partno;
bdev->bd_inode = inode;
bdev->bd_mapping = &inode->i_data;
bdev->bd_queue = disk->queue;
if (partno)
bdev->bd_has_submit_bio = disk->part0->bd_has_submit_bio;

1
include/linux/blk_types.h
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@ -51,6 +51,7 @@ struct block_device {
bool bd_has_submit_bio;
dev_t bd_dev;
struct inode *bd_inode; /* will die */
struct address_space *bd_mapping; /* page cache */
atomic_t bd_openers;
spinlock_t bd_size_lock; /* for bd_inode->i_size updates */