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-rw-r--r--drivers/md/dm.c97
-rw-r--r--include/uapi/linux/dm-ioctl.h4
2 files changed, 46 insertions, 55 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 3b3cbd1a1659..d4438188d088 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -458,67 +458,56 @@ static int dm_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
return dm_get_geometry(md, geo);
}
-static char *_dm_claim_ptr = "I belong to device-mapper";
-
-static int dm_get_bdev_for_ioctl(struct mapped_device *md,
- struct block_device **bdev,
- fmode_t *mode)
+static int dm_prepare_ioctl(struct mapped_device *md, int *srcu_idx,
+ struct block_device **bdev, fmode_t *mode)
+ __acquires(md->io_barrier)
{
struct dm_target *tgt;
struct dm_table *map;
- int srcu_idx, r, r2;
+ int r;
retry:
r = -ENOTTY;
- map = dm_get_live_table(md, &srcu_idx);
+ map = dm_get_live_table(md, srcu_idx);
if (!map || !dm_table_get_size(map))
- goto out;
+ return r;
/* We only support devices that have a single target */
if (dm_table_get_num_targets(map) != 1)
- goto out;
+ return r;
tgt = dm_table_get_target(map, 0);
if (!tgt->type->prepare_ioctl)
- goto out;
+ return r;
- if (dm_suspended_md(md)) {
- r = -EAGAIN;
- goto out;
- }
+ if (dm_suspended_md(md))
+ return -EAGAIN;
r = tgt->type->prepare_ioctl(tgt, bdev, mode);
- if (r < 0)
- goto out;
-
- bdgrab(*bdev);
- r2 = blkdev_get(*bdev, *mode, _dm_claim_ptr);
- if (r2 < 0) {
- r = r2;
- goto out;
- }
-
- dm_put_live_table(md, srcu_idx);
- return r;
-
-out:
- dm_put_live_table(md, srcu_idx);
if (r == -ENOTCONN && !fatal_signal_pending(current)) {
+ dm_put_live_table(md, *srcu_idx);
msleep(10);
goto retry;
}
+
return r;
}
+static void dm_unprepare_ioctl(struct mapped_device *md, int srcu_idx)
+ __releases(md->io_barrier)
+{
+ dm_put_live_table(md, srcu_idx);
+}
+
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;
- int r;
+ int r, srcu_idx;
- r = dm_get_bdev_for_ioctl(md, &bdev, &mode);
+ r = dm_prepare_ioctl(md, &srcu_idx, &bdev, &mode);
if (r < 0)
- return r;
+ goto out;
if (r > 0) {
/*
@@ -536,7 +525,7 @@ static int dm_blk_ioctl(struct block_device *bdev, fmode_t mode,
r = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
out:
- blkdev_put(bdev, mode);
+ dm_unprepare_ioctl(md, srcu_idx);
return r;
}
@@ -710,6 +699,8 @@ static void dm_put_live_table_fast(struct mapped_device *md) __releases(RCU)
rcu_read_unlock();
}
+static char *_dm_claim_ptr = "I belong to device-mapper";
+
/*
* Open a table device so we can use it as a map destination.
*/
@@ -3044,19 +3035,19 @@ 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;
fmode_t mode;
- int r;
+ int r, srcu_idx;
- r = dm_get_bdev_for_ioctl(md, &bdev, &mode);
+ r = dm_prepare_ioctl(md, &srcu_idx, &bdev, &mode);
if (r < 0)
- return r;
+ goto out;
ops = bdev->bd_disk->fops->pr_ops;
if (ops && ops->pr_reserve)
r = ops->pr_reserve(bdev, key, type, flags);
else
r = -EOPNOTSUPP;
-
- blkdev_put(bdev, mode);
+out:
+ dm_unprepare_ioctl(md, srcu_idx);
return r;
}
@@ -3065,19 +3056,19 @@ 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;
fmode_t mode;
- int r;
+ int r, srcu_idx;
- r = dm_get_bdev_for_ioctl(md, &bdev, &mode);
+ r = dm_prepare_ioctl(md, &srcu_idx, &bdev, &mode);
if (r < 0)
- return r;
+ goto out;
ops = bdev->bd_disk->fops->pr_ops;
if (ops && ops->pr_release)
r = ops->pr_release(bdev, key, type);
else
r = -EOPNOTSUPP;
-
- blkdev_put(bdev, mode);
+out:
+ dm_unprepare_ioctl(md, srcu_idx);
return r;
}
@@ -3087,19 +3078,19 @@ 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;
fmode_t mode;
- int r;
+ int r, srcu_idx;
- r = dm_get_bdev_for_ioctl(md, &bdev, &mode);
+ r = dm_prepare_ioctl(md, &srcu_idx, &bdev, &mode);
if (r < 0)
- return r;
+ goto out;
ops = bdev->bd_disk->fops->pr_ops;
if (ops && ops->pr_preempt)
r = ops->pr_preempt(bdev, old_key, new_key, type, abort);
else
r = -EOPNOTSUPP;
-
- blkdev_put(bdev, mode);
+out:
+ dm_unprepare_ioctl(md, srcu_idx);
return r;
}
@@ -3108,19 +3099,19 @@ 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;
fmode_t mode;
- int r;
+ int r, srcu_idx;
- r = dm_get_bdev_for_ioctl(md, &bdev, &mode);
+ r = dm_prepare_ioctl(md, &srcu_idx, &bdev, &mode);
if (r < 0)
- return r;
+ goto out;
ops = bdev->bd_disk->fops->pr_ops;
if (ops && ops->pr_clear)
r = ops->pr_clear(bdev, key);
else
r = -EOPNOTSUPP;
-
- blkdev_put(bdev, mode);
+out:
+ dm_unprepare_ioctl(md, srcu_idx);
return r;
}
diff --git a/include/uapi/linux/dm-ioctl.h b/include/uapi/linux/dm-ioctl.h
index 5108da02cd32..d1e49514977b 100644
--- a/include/uapi/linux/dm-ioctl.h
+++ b/include/uapi/linux/dm-ioctl.h
@@ -270,9 +270,9 @@ enum {
#define DM_DEV_SET_GEOMETRY _IOWR(DM_IOCTL, DM_DEV_SET_GEOMETRY_CMD, struct dm_ioctl)
#define DM_VERSION_MAJOR 4
-#define DM_VERSION_MINOR 38
+#define DM_VERSION_MINOR 39
#define DM_VERSION_PATCHLEVEL 0
-#define DM_VERSION_EXTRA "-ioctl (2018-02-28)"
+#define DM_VERSION_EXTRA "-ioctl (2018-04-03)"
/* Status bits */
#define DM_READONLY_FLAG (1 << 0) /* In/Out */
generated by cgit (git 2.34.1) at 2024-05-28 05:10:35 +0000