[PATCH 19/29] fs: Convert to bdev_open_by_dev()

Jan Kara
2023-08-23T10:50:34Z

Convert mount code to use bdev_open_by_dev() and propagate the handle
around to bdev_release().

Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
---
fs/cramfs/inode.c | 2 +-
fs/romfs/super.c | 2 +-
fs/super.c | 15 +++++++++------
include/linux/fs.h | 1 +
4 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/fs/cramfs/inode.c b/fs/cramfs/inode.c
index 5ee7d7bbb361..2fbf97077ce9 100644
--- a/fs/cramfs/inode.c
+++ b/fs/cramfs/inode.c
@@ -495,7 +495,7 @@ static void cramfs_kill_sb(struct super_block *sb)
sb->s_mtd = NULL;
} else if (IS_ENABLED(CONFIG_CRAMFS_BLOCKDEV) && sb->s_bdev) {
sync_blockdev(sb->s_bdev);
- blkdev_put(sb->s_bdev, sb);
+ bdev_release(sb->s_bdev_handle);
}
kfree(sbi);
}
diff --git a/fs/romfs/super.c b/fs/romfs/super.c
index 5c35f6c76037..b1bdfbc211c3 100644
--- a/fs/romfs/super.c
+++ b/fs/romfs/super.c
@@ -593,7 +593,7 @@ static void romfs_kill_sb(struct super_block *sb)
#ifdef CONFIG_ROMFS_ON_BLOCK
if (sb->s_bdev) {
sync_blockdev(sb->s_bdev);
- blkdev_put(sb->s_bdev, sb);
+ bdev_release(sb->s_bdev_handle);
}
#endif
}
diff --git a/fs/super.c b/fs/super.c
index 1bea34be5d43..82757f3e0f1b 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -1250,14 +1250,16 @@ int setup_bdev_super(struct super_block *sb, int sb_flags,
struct fs_context *fc)
{
blk_mode_t mode = sb_open_mode(sb_flags);
+ struct bdev_handle *bdev_handle;
struct block_device *bdev;

- bdev = blkdev_get_by_dev(sb->s_dev, mode, sb, &fs_holder_ops);
- if (IS_ERR(bdev)) {
+ bdev_handle = bdev_open_by_dev(sb->s_dev, mode, sb, &fs_holder_ops);
+ if (IS_ERR(bdev_handle)) {
if (fc)
errorf(fc, "%s: Can't open blockdev", fc->source);
- return PTR_ERR(bdev);
+ return PTR_ERR(bdev_handle);
}
+ bdev = bdev_handle->bdev;

/*
* This really should be in blkdev_get_by_dev, but right now can't due
@@ -1265,7 +1267,7 @@ int setup_bdev_super(struct super_block *sb, int sb_flags,
* writable from userspace even for a read-only block device.
*/
if ((mode & BLK_OPEN_WRITE) && bdev_read_only(bdev)) {
- blkdev_put(bdev, sb);
+ bdev_release(bdev_handle);
return -EACCES;
}

@@ -1281,10 +1283,11 @@ int setup_bdev_super(struct super_block *sb, int sb_flags,
mutex_unlock(&bdev->bd_fsfreeze_mutex);
if (fc)
warnf(fc, "%pg: Can't mount, blockdev is frozen", bdev);
- blkdev_put(bdev, sb);
+ bdev_release(bdev_handle);
return -EBUSY;
}
spin_lock(&sb_lock);
+ sb->s_bdev_handle = bdev_handle;
sb->s_bdev = bdev;
sb->s_bdi = bdi_get(bdev->bd_disk->bdi);
if (bdev_stable_writes(bdev))
@@ -1418,7 +1421,7 @@ void kill_block_super(struct super_block *sb)
generic_shutdown_super(sb);
if (bdev) {
sync_blockdev(bdev);
- blkdev_put(bdev, sb);
+ bdev_release(sb->s_bdev_handle);
}
}

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 22b59cd36963..b5c61107bd6d 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1187,6 +1187,7 @@ struct super_block {
struct hlist_bl_head s_roots; /* alternate root dentries for NFS */
struct list_head s_mounts; /* list of mounts; _not_ for fs use */
struct block_device *s_bdev;
+ struct bdev_handle *s_bdev_handle;
struct backing_dev_info *s_bdi;
struct mtd_info *s_mtd;
struct hlist_node s_instances;
--
2.35.3