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md: port block device access to file

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Link: https://lore.kernel.org/r/20240123-vfs-bdev-file-v2-4-adbd023e19cc@kernel.org
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2024-01-23 14:26:21 +01:00
parent 190f676afa
commit a28d893eb3
No known key found for this signature in database
GPG Key ID: 91C61BC06578DCA2
4 changed files with 21 additions and 18 deletions
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23
drivers/md/dm.c
View File

@ -726,7 +726,8 @@ static struct table_device *open_table_device(struct mapped_device *md,
dev_t dev, blk_mode_t mode)
{
struct table_device *td;
struct bdev_handle *bdev_handle;
struct file *bdev_file;
struct block_device *bdev;
u64 part_off;
int r;
@ -735,34 +736,36 @@ static struct table_device *open_table_device(struct mapped_device *md,
return ERR_PTR(-ENOMEM);
refcount_set(&td->count, 1);
bdev_handle = bdev_open_by_dev(dev, mode, _dm_claim_ptr, NULL);
if (IS_ERR(bdev_handle)) {
r = PTR_ERR(bdev_handle);
bdev_file = bdev_file_open_by_dev(dev, mode, _dm_claim_ptr, NULL);
if (IS_ERR(bdev_file)) {
r = PTR_ERR(bdev_file);
goto out_free_td;
}
bdev = file_bdev(bdev_file);
/*
* We can be called before the dm disk is added. In that case we can't
* register the holder relation here. It will be done once add_disk was
* called.
*/
if (md->disk->slave_dir) {
r = bd_link_disk_holder(bdev_handle->bdev, md->disk);
r = bd_link_disk_holder(bdev, md->disk);
if (r)
goto out_blkdev_put;
}
td->dm_dev.mode = mode;
td->dm_dev.bdev = bdev_handle->bdev;
td->dm_dev.bdev_handle = bdev_handle;
td->dm_dev.dax_dev = fs_dax_get_by_bdev(bdev_handle->bdev, &part_off,
td->dm_dev.bdev = bdev;
td->dm_dev.bdev_file = bdev_file;
td->dm_dev.dax_dev = fs_dax_get_by_bdev(bdev, &part_off,
NULL, NULL);
format_dev_t(td->dm_dev.name, dev);
list_add(&td->list, &md->table_devices);
return td;
out_blkdev_put:
bdev_release(bdev_handle);
fput(bdev_file);
out_free_td:
kfree(td);
return ERR_PTR(r);
@ -775,7 +778,7 @@ static void close_table_device(struct table_device *td, struct mapped_device *md
{
if (md->disk->slave_dir)
bd_unlink_disk_holder(td->dm_dev.bdev, md->disk);
bdev_release(td->dm_dev.bdev_handle);
fput(td->dm_dev.bdev_file);
put_dax(td->dm_dev.dax_dev);
list_del(&td->list);
kfree(td);

12
drivers/md/md.c
View File

@ -2578,7 +2578,7 @@ static void export_rdev(struct md_rdev *rdev, struct mddev *mddev)
if (test_bit(AutoDetected, &rdev->flags))
md_autodetect_dev(rdev->bdev->bd_dev);
#endif
bdev_release(rdev->bdev_handle);
fput(rdev->bdev_file);
rdev->bdev = NULL;
kobject_put(&rdev->kobj);
}
@ -3773,16 +3773,16 @@ static struct md_rdev *md_import_device(dev_t newdev, int super_format, int supe
if (err)
goto out_clear_rdev;
rdev->bdev_handle = bdev_open_by_dev(newdev,
rdev->bdev_file = bdev_file_open_by_dev(newdev,
BLK_OPEN_READ | BLK_OPEN_WRITE,
super_format == -2 ? &claim_rdev : rdev, NULL);
if (IS_ERR(rdev->bdev_handle)) {
if (IS_ERR(rdev->bdev_file)) {
pr_warn("md: could not open device unknown-block(%u,%u).\n",
MAJOR(newdev), MINOR(newdev));
err = PTR_ERR(rdev->bdev_handle);
err = PTR_ERR(rdev->bdev_file);
goto out_clear_rdev;
}
rdev->bdev = rdev->bdev_handle->bdev;
rdev->bdev = file_bdev(rdev->bdev_file);
kobject_init(&rdev->kobj, &rdev_ktype);
@ -3813,7 +3813,7 @@ static struct md_rdev *md_import_device(dev_t newdev, int super_format, int supe
return rdev;
out_blkdev_put:
bdev_release(rdev->bdev_handle);
fput(rdev->bdev_file);
out_clear_rdev:
md_rdev_clear(rdev);
out_free_rdev:

2
drivers/md/md.h
View File

@ -59,7 +59,7 @@ struct md_rdev {
*/
struct block_device *meta_bdev;
struct block_device *bdev; /* block device handle */
struct bdev_handle *bdev_handle; /* Handle from open for bdev */
struct file *bdev_file; /* Handle from open for bdev */
struct page *sb_page, *bb_page;
int sb_loaded;

2
include/linux/device-mapper.h
View File

@ -165,7 +165,7 @@ void dm_error(const char *message);
struct dm_dev {
struct block_device *bdev;
struct bdev_handle *bdev_handle;
struct file *bdev_file;
struct dax_device *dax_dev;
blk_mode_t mode;
char name[16];