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block: stop using bdget_disk for partition 0

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We can just dereference the point in struct gendisk instead.  Also
remove the now unused export.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2020-11-26 10:41:07 +01:00 committed by Jens Axboe
parent 0d02129e76
commit 977115c0f6
7 changed files with 13 additions and 49 deletions
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1
block/genhd.c
View File

@ -930,7 +930,6 @@ struct block_device *bdget_disk(struct gendisk *disk, int partno)
return bdev;
}
EXPORT_SYMBOL(bdget_disk);
/*
* print a full list of all partitions - intended for places where the root

4
drivers/block/nbd.c
View File

@ -1488,12 +1488,10 @@ out:
static void nbd_release(struct gendisk *disk, fmode_t mode)
{
struct nbd_device *nbd = disk->private_data;
struct block_device *bdev = bdget_disk(disk, 0);
if (test_bit(NBD_RT_DISCONNECT_ON_CLOSE, &nbd->config->runtime_flags) &&
bdev->bd_openers == 0)
disk->part0->bd_openers == 0)
nbd_disconnect_and_put(nbd);
bdput(bdev);
nbd_config_put(nbd);
nbd_put(nbd);

20
drivers/block/xen-blkfront.c
View File

@ -2153,7 +2153,7 @@ static void blkfront_closing(struct blkfront_info *info)
}
if (info->gd)
bdev = bdget_disk(info->gd, 0);
bdev = bdgrab(info->gd->part0);
mutex_unlock(&info->mutex);
@ -2518,7 +2518,7 @@ static int blkfront_remove(struct xenbus_device *xbdev)
disk = info->gd;
if (disk)
bdev = bdget_disk(disk, 0);
bdev = bdgrab(disk->part0);
info->xbdev = NULL;
mutex_unlock(&info->mutex);
@ -2595,19 +2595,11 @@ out:
static void blkif_release(struct gendisk *disk, fmode_t mode)
{
struct blkfront_info *info = disk->private_data;
struct block_device *bdev;
struct xenbus_device *xbdev;
mutex_lock(&blkfront_mutex);
bdev = bdget_disk(disk, 0);
if (!bdev) {
WARN(1, "Block device %s yanked out from us!\n", disk->disk_name);
if (disk->part0->bd_openers)
goto out_mutex;
}
if (bdev->bd_openers)
goto out;
/*
* Check if we have been instructed to close. We will have
@ -2619,7 +2611,7 @@ static void blkif_release(struct gendisk *disk, fmode_t mode)
if (xbdev && xbdev->state == XenbusStateClosing) {
/* pending switch to state closed */
dev_info(disk_to_dev(bdev->bd_disk), "releasing disk\n");
dev_info(disk_to_dev(disk), "releasing disk\n");
xlvbd_release_gendisk(info);
xenbus_frontend_closed(info->xbdev);
}
@ -2628,14 +2620,12 @@ static void blkif_release(struct gendisk *disk, fmode_t mode)
if (!xbdev) {
/* sudden device removal */
dev_info(disk_to_dev(bdev->bd_disk), "releasing disk\n");
dev_info(disk_to_dev(disk), "releasing disk\n");
xlvbd_release_gendisk(info);
disk->private_data = NULL;
free_info(info);
}
out:
bdput(bdev);
out_mutex:
mutex_unlock(&blkfront_mutex);
}

14
drivers/block/zram/zram_drv.c
View File

@ -1760,15 +1760,12 @@ static ssize_t reset_store(struct device *dev,
return -EINVAL;
zram = dev_to_zram(dev);
bdev = bdget_disk(zram->disk, 0);
if (!bdev)
return -ENOMEM;
bdev = zram->disk->part0;
mutex_lock(&bdev->bd_mutex);
/* Do not reset an active device or claimed device */
if (bdev->bd_openers || zram->claim) {
mutex_unlock(&bdev->bd_mutex);
bdput(bdev);
return -EBUSY;
}
@ -1779,7 +1776,6 @@ static ssize_t reset_store(struct device *dev,
/* Make sure all the pending I/O are finished */
fsync_bdev(bdev);
zram_reset_device(zram);
bdput(bdev);
mutex_lock(&bdev->bd_mutex);
zram->claim = false;
@ -1965,16 +1961,11 @@ out_free_dev:
static int zram_remove(struct zram *zram)
{
struct block_device *bdev;
bdev = bdget_disk(zram->disk, 0);
if (!bdev)
return -ENOMEM;
struct block_device *bdev = zram->disk->part0;
mutex_lock(&bdev->bd_mutex);
if (bdev->bd_openers || zram->claim) {
mutex_unlock(&bdev->bd_mutex);
bdput(bdev);
return -EBUSY;
}
@ -1986,7 +1977,6 @@ static int zram_remove(struct zram *zram)
/* Make sure all the pending I/O are finished */
fsync_bdev(bdev);
zram_reset_device(zram);
bdput(bdev);
pr_info("Removed device: %s\n", zram->disk->disk_name);

16
drivers/md/dm.c
View File

@ -2375,16 +2375,11 @@ out:
*/
static int lock_fs(struct mapped_device *md)
{
struct block_device *bdev;
int r;
WARN_ON(test_bit(DMF_FROZEN, &md->flags));
bdev = bdget_disk(md->disk, 0);
if (!bdev)
return -ENOMEM;
r = freeze_bdev(bdev);
bdput(bdev);
r = freeze_bdev(md->disk->part0);
if (!r)
set_bit(DMF_FROZEN, &md->flags);
return r;
@ -2392,16 +2387,9 @@ static int lock_fs(struct mapped_device *md)
static void unlock_fs(struct mapped_device *md)
{
struct block_device *bdev;
if (!test_bit(DMF_FROZEN, &md->flags))
return;
bdev = bdget_disk(md->disk, 0);
if (!bdev)
return;
thaw_bdev(bdev);
bdput(bdev);
thaw_bdev(md->disk->part0);
clear_bit(DMF_FROZEN, &md->flags);
}

5
drivers/s390/block/dasd_ioctl.c
View File

@ -220,9 +220,8 @@ dasd_format(struct dasd_block *block, struct format_data_t *fdata)
* enabling the device later.
*/
if (fdata->start_unit == 0) {
struct block_device *bdev = bdget_disk(block->gdp, 0);
bdev->bd_inode->i_blkbits = blksize_bits(fdata->blksize);
bdput(bdev);
block->gdp->part0->bd_inode->i_blkbits =
blksize_bits(fdata->blksize);
}
rc = base->discipline->format_device(base, fdata, 1);

2
fs/block_dev.c
View File

@ -1299,7 +1299,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode)
if (ret)
return ret;
} else {
struct block_device *whole = bdget_disk(disk, 0);
struct block_device *whole = bdgrab(disk->part0);
mutex_lock_nested(&whole->bd_mutex, 1);
ret = __blkdev_get(whole, mode);