md: port block device access to file

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>

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 8dcabf84d866e6d2ac863a98790b16b838475d23..87de5b5682ade50b6b18966c6078608c27b018b8 100644 (file)
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -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);

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 2266358d807466f95d02b431d09ee39805dff5e8..0653584db63b38205050e0c373bb96ec2569b754 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -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:

diff --git a/drivers/md/md.h b/drivers/md/md.h
index 8d881cc597992f1a2af08cb05d07081182860ebd..a079ee9b619044aac43885d4383d002f4ae0c057 100644 (file)
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -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;

diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index 772ab4d74d944b53d97a685c9c1e9f0b95fbb699..82b2195efaca782fc06b7018edda51311297ac87 100644 (file)
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -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];