[PATCH 33/45] block: move the partition_meta_info to struct block_device

Christoph Hellwig
2020-11-28T22:12:04Z

Move the partition_meta_info to struct block_device in preparation for
killing struct hd_struct.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
---
block/blk.h | 1 -
block/genhd.c | 3 ++-
block/partitions/core.c | 18 +++++++-----------
fs/block_dev.c | 1 +
include/linux/blk_types.h | 2 ++
include/linux/genhd.h | 1 -
init/do_mounts.c | 7 ++++---
7 files changed, 16 insertions(+), 17 deletions(-)

diff --git a/block/blk.h b/block/blk.h
index 3f801f6e86f8a1..0bd4b58bcbaf77 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -381,7 +381,6 @@ static inline void hd_struct_put(struct hd_struct *part)

static inline void hd_free_part(struct hd_struct *part)
{
- kfree(part->info);
bdput(part->bdev);
percpu_ref_exit(&part->ref);
}
diff --git a/block/genhd.c b/block/genhd.c
index 7bb45382658385..fe202a12eec096 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -1002,7 +1002,8 @@ void __init printk_all_partitions(void)
bdevt_str(part_devt(part), devt_buf),
bdev_nr_sectors(part->bdev) >> 1,
disk_name(disk, part->partno, name_buf),
- part->info ? part->info->uuid : "");
+ part->bdev->bd_meta_info ?
+ part->bdev->bd_meta_info->uuid : "");
if (is_part0) {
if (dev->parent && dev->parent->driver)
printk(" driver: %s\n",
diff --git a/block/partitions/core.c b/block/partitions/core.c
index 460a745812c6d4..07df9ff554627f 100644
--- a/block/partitions/core.c
+++ b/block/partitions/core.c
@@ -275,8 +275,9 @@ static int part_uevent(struct device *dev, struct kobj_uevent_env *env)
struct hd_struct *part = dev_to_part(dev);

add_uevent_var(env, "PARTN=%u", part->partno);
- if (part->info && part->info->volname[0])
- add_uevent_var(env, "PARTNAME=%s", part->info->volname);
+ if (part->bdev->bd_meta_info && part->bdev->bd_meta_info->volname[0])
+ add_uevent_var(env, "PARTNAME=%s",
+ part->bdev->bd_meta_info->volname);
return 0;
}

@@ -422,13 +423,10 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno,
p->policy = get_disk_ro(disk);

if (info) {
- struct partition_meta_info *pinfo;
-
- pinfo = kzalloc_node(sizeof(*pinfo), GFP_KERNEL, disk->node_id);
- if (!pinfo)
+ err = -ENOMEM;
+ bdev->bd_meta_info = kmemdup(info, sizeof(*info), GFP_KERNEL);
+ if (!bdev->bd_meta_info)
goto out_bdput;
- memcpy(pinfo, info, sizeof(*info));
- p->info = pinfo;
}

dname = dev_name(ddev);
@@ -444,7 +442,7 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno,

err = blk_alloc_devt(p, &devt);
if (err)
- goto out_free_info;
+ goto out_bdput;
pdev->devt = devt;

/* delay uevent until 'holders' subdir is created */
@@ -481,8 +479,6 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno,
kobject_uevent(&pdev->kobj, KOBJ_ADD);
return p;

-out_free_info:
- kfree(p->info);
out_bdput:
bdput(bdev);
out_free:
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 0832c7830f3a10..0770f654b09cdf 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -785,6 +785,7 @@ static void bdev_free_inode(struct inode *inode)
struct block_device *bdev = I_BDEV(inode);

free_percpu(bdev->bd_stats);
+ kfree(bdev->bd_meta_info);

kmem_cache_free(bdev_cachep, BDEV_I(inode));
}
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index a690008f60cd92..2f8ede04e5a94c 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -49,6 +49,8 @@ struct block_device {
/* Mutex for freeze */
struct mutex bd_fsfreeze_mutex;
struct super_block *bd_fsfreeze_sb;
+
+ struct partition_meta_info *bd_meta_info;
} __randomize_layout;

#define bdev_whole(_bdev) \
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 50d27f5d38e2af..30d7076155b4d2 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -57,7 +57,6 @@ struct hd_struct {
struct device __dev;
struct kobject *holder_dir;
int policy, partno;
- struct partition_meta_info *info;
#ifdef CONFIG_FAIL_MAKE_REQUEST
int make_it_fail;
#endif
diff --git a/init/do_mounts.c b/init/do_mounts.c
index 5879edf083b318..368ccb71850126 100644
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -79,8 +79,8 @@ static int match_dev_by_uuid(struct device *dev, const void *data)
const struct uuidcmp *cmp = data;
struct hd_struct *part = dev_to_part(dev);

- if (!part->info ||
- strncasecmp(cmp->uuid, part->info->uuid, cmp->len))
+ if (!part->bdev->bd_meta_info ||
+ strncasecmp(cmp->uuid, part->bdev->bd_meta_info->uuid, cmp->len))
return 0;
return 1;
}
@@ -169,7 +169,8 @@ static int match_dev_by_label(struct device *dev, const void *data)
const char *label = data;
struct hd_struct *part = dev_to_part(dev);

- if (!part->info || strcmp(label, part->info->volname))
+ if (!part->bdev->bd_meta_info ||
+ strcmp(label, part->bdev->bd_meta_info->volname))
return 0;
return 1;
}
--
2.29.2