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block/genhd: port disk_scan_partitions() to file

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This may run from a kernel thread via device_add_disk(). So this could
also use __fput_sync() if we were worried about EBUSY. But when it is
called from a kernel thread it's always BLK_OPEN_READ so EBUSY can't
really happen even if we do BLK_OPEN_RESTRICT_WRITES or BLK_OPEN_EXCL.

Otherwise it's called from an ioctl on the block device which is only
called from userspace and can rely on task work.

Link: https://lore.kernel.org/r/20240123-vfs-bdev-file-v2-3-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 14:26:20 +01:00
parent e5ca9d3916
commit 190f676afa
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GPG key ID: 91C61BC06578DCA2
1 changed files with 6 additions and 6 deletions
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12
block/genhd.c
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@ -342,7 +342,7 @@ EXPORT_SYMBOL_GPL(disk_uevent);
int disk_scan_partitions(struct gendisk *disk, blk_mode_t mode)
{
struct bdev_handle *handle;
struct file *file;
int ret = 0;
if (disk->flags & (GENHD_FL_NO_PART | GENHD_FL_HIDDEN))
@ -366,12 +366,12 @@ int disk_scan_partitions(struct gendisk *disk, blk_mode_t mode)
}
set_bit(GD_NEED_PART_SCAN, &disk->state);
handle = bdev_open_by_dev(disk_devt(disk), mode & ~BLK_OPEN_EXCL, NULL,
NULL);
if (IS_ERR(handle))
ret = PTR_ERR(handle);
file = bdev_file_open_by_dev(disk_devt(disk), mode & ~BLK_OPEN_EXCL,
NULL, NULL);
if (IS_ERR(file))
ret = PTR_ERR(file);
else
bdev_release(handle);
fput(file);
/*
* If blkdev_get_by_dev() failed early, GD_NEED_PART_SCAN is still set,