提交 66482026 编写于 作者: M Mike Snitzer

dm: do not return target from dm_get_live_table_for_ioctl()

None of the callers actually used the returned target.
Also, just reuse bdev pointer passed to dm_blk_ioctl().
Signed-off-by: NMike Snitzer <snitzer@redhat.com>
上级 4328daa2
......@@ -557,9 +557,10 @@ static int dm_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
}
static int dm_get_live_table_for_ioctl(struct mapped_device *md,
struct dm_target **tgt, struct block_device **bdev,
fmode_t *mode, int *srcu_idx)
struct block_device **bdev,
fmode_t *mode, int *srcu_idx)
{
struct dm_target *tgt;
struct dm_table *map;
int r;
......@@ -573,9 +574,8 @@ static int dm_get_live_table_for_ioctl(struct mapped_device *md,
if (dm_table_get_num_targets(map) != 1)
goto out;
*tgt = dm_table_get_target(map, 0);
if (!(*tgt)->type->prepare_ioctl)
tgt = dm_table_get_target(map, 0);
if (!tgt->type->prepare_ioctl)
goto out;
if (dm_suspended_md(md)) {
......@@ -583,7 +583,7 @@ static int dm_get_live_table_for_ioctl(struct mapped_device *md,
goto out;
}
r = (*tgt)->type->prepare_ioctl(*tgt, bdev, mode);
r = tgt->type->prepare_ioctl(tgt, bdev, mode);
if (r < 0)
goto out;
......@@ -602,11 +602,9 @@ static int dm_blk_ioctl(struct block_device *bdev, fmode_t mode,
unsigned int cmd, unsigned long arg)
{
struct mapped_device *md = bdev->bd_disk->private_data;
struct dm_target *tgt;
struct block_device *tgt_bdev = NULL;
int srcu_idx, r;
r = dm_get_live_table_for_ioctl(md, &tgt, &tgt_bdev, &mode, &srcu_idx);
r = dm_get_live_table_for_ioctl(md, &bdev, &mode, &srcu_idx);
if (r < 0)
return r;
......@@ -621,7 +619,7 @@ static int dm_blk_ioctl(struct block_device *bdev, fmode_t mode,
goto out;
}
r = __blkdev_driver_ioctl(tgt_bdev, mode, cmd, arg);
r = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
out:
dm_put_live_table(md, srcu_idx);
return r;
......@@ -3558,11 +3556,10 @@ static int dm_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
{
struct mapped_device *md = bdev->bd_disk->private_data;
const struct pr_ops *ops;
struct dm_target *tgt;
fmode_t mode;
int srcu_idx, r;
r = dm_get_live_table_for_ioctl(md, &tgt, &bdev, &mode, &srcu_idx);
r = dm_get_live_table_for_ioctl(md, &bdev, &mode, &srcu_idx);
if (r < 0)
return r;
......@@ -3581,11 +3578,10 @@ static int dm_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
{
struct mapped_device *md = bdev->bd_disk->private_data;
const struct pr_ops *ops;
struct dm_target *tgt;
fmode_t mode;
int srcu_idx, r;
r = dm_get_live_table_for_ioctl(md, &tgt, &bdev, &mode, &srcu_idx);
r = dm_get_live_table_for_ioctl(md, &bdev, &mode, &srcu_idx);
if (r < 0)
return r;
......@@ -3603,11 +3599,10 @@ static int dm_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
{
struct mapped_device *md = bdev->bd_disk->private_data;
const struct pr_ops *ops;
struct dm_target *tgt;
fmode_t mode;
int srcu_idx, r;
r = dm_get_live_table_for_ioctl(md, &tgt, &bdev, &mode, &srcu_idx);
r = dm_get_live_table_for_ioctl(md, &bdev, &mode, &srcu_idx);
if (r < 0)
return r;
......@@ -3626,11 +3621,10 @@ static int dm_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
{
struct mapped_device *md = bdev->bd_disk->private_data;
const struct pr_ops *ops;
struct dm_target *tgt;
fmode_t mode;
int srcu_idx, r;
r = dm_get_live_table_for_ioctl(md, &tgt, &bdev, &mode, &srcu_idx);
r = dm_get_live_table_for_ioctl(md, &bdev, &mode, &srcu_idx);
if (r < 0)
return r;
......@@ -3648,11 +3642,10 @@ static int dm_pr_clear(struct block_device *bdev, u64 key)
{
struct mapped_device *md = bdev->bd_disk->private_data;
const struct pr_ops *ops;
struct dm_target *tgt;
fmode_t mode;
int srcu_idx, r;
r = dm_get_live_table_for_ioctl(md, &tgt, &bdev, &mode, &srcu_idx);
r = dm_get_live_table_for_ioctl(md, &bdev, &mode, &srcu_idx);
if (r < 0)
return r;
......
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