Find out which mapped device the offset belongs to, and translate the
offset from target device to mapped device. When it is done, call
dax_corrupted_range() for the holder of this mapped device.
Signed-off-by: Shiyang Ruan <ruansy.fnst@xxxxxxxxxxx>
---
drivers/md/dm.c | 126 +++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 125 insertions(+), 1 deletion(-)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 2c5f9e585211..a35b9a97a73f 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -626,7 +626,11 @@ static void dm_put_live_table_fast(struct mapped_device *md) __releases(RCU)
}
static char *_dm_claim_ptr = "I belong to device-mapper";
-
+static const struct dax_holder_operations dm_dax_holder_ops;
+struct dm_holder {
+ struct list_head list;
+ struct mapped_device *md;
+};
/*
* Open a table device so we can use it as a map destination.
*/
@@ -634,6 +638,8 @@ static int open_table_device(struct table_device *td, dev_t dev,
struct mapped_device *md)
{
struct block_device *bdev;
+ struct list_head *holders;
+ struct dm_holder *holder;
int r;
@@ -651,6 +657,19 @@ static int open_table_device(struct table_device *td, dev_t dev,
td->dm_dev.bdev = bdev;
td->dm_dev.dax_dev = dax_get_by_host(bdev->bd_disk->disk_name);
+ if (!td->dm_dev.dax_dev)
+ return 0;
+
+ holders = dax_get_holder(td->dm_dev.dax_dev);
+ if (!holders) {
+ holders = kmalloc(sizeof(*holders), GFP_KERNEL);
+ INIT_LIST_HEAD(holders);
+ dax_set_holder(td->dm_dev.dax_dev, holders, &dm_dax_holder_ops);
+ }
+ holder = kmalloc(sizeof(*holder), GFP_KERNEL);
+ holder->md = md;
+ list_add_tail(&holder->list, holders);
+
return 0;
}
@@ -659,9 +678,27 @@ static int open_table_device(struct table_device *td, dev_t dev,
*/
static void close_table_device(struct table_device *td, struct mapped_device *md)
{
+ struct list_head *holders;
+ struct dm_holder *holder, *n;
+
if (!td->dm_dev.bdev)
return;
+ holders = dax_get_holder(td->dm_dev.dax_dev);
+ if (holders) {
+ list_for_each_entry_safe(holder, n, holders, list) {
+ if (holder->md == md) {
+ list_del(&holder->list);
+ kfree(holder);
+ }
+ }
+ if (list_empty(holders)) {
+ kfree(holders);
+ /* unset dax_device's holder_data */
+ dax_set_holder(td->dm_dev.dax_dev, NULL, NULL);
+ }
+ }
+
bd_unlink_disk_holder(td->dm_dev.bdev, dm_disk(md));
blkdev_put(td->dm_dev.bdev, td->dm_dev.mode | FMODE_EXCL);
put_dax(td->dm_dev.dax_dev);
@@ -1115,6 +1152,89 @@ static int dm_dax_zero_page_range(struct dax_device *dax_dev, pgoff_t pgoff,
return ret;
}
+#if IS_ENABLED(CONFIG_DAX_DRIVER)
+struct corrupted_hit_info {
+ struct dax_device *dax_dev;
+ sector_t offset;
+};
+
+static int dm_blk_corrupted_hit(struct dm_target *ti, struct dm_dev *dev,
+ sector_t start, sector_t count, void *data)
+{
+ struct corrupted_hit_info *bc = data;
+
+ return bc->dax_dev == (void *)dev->dax_dev &&
+ (start <= bc->offset && bc->offset < start + count);
+}
+
+struct corrupted_do_info {
+ size_t length;
+ void *data;
+};
+
+static int dm_blk_corrupted_do(struct dm_target *ti, struct block_device *bdev,
+ sector_t sector, void *data)
+{
+ struct mapped_device *md = ti->table->md;
+ struct corrupted_do_info *bc = data;
+
+ return dax_holder_notify_failure(md->dax_dev, to_bytes(sector),
+ bc->length, bc->data);
+}
+
+static int dm_dax_notify_failure_one(struct mapped_device *md,
+ struct dax_device *dax_dev,
+ loff_t offset, size_t length, void *data)
+{
+ struct dm_table *map;
+ struct dm_target *ti;
+ sector_t sect = to_sector(offset);
+ struct corrupted_hit_info hi = {dax_dev, sect};
+ struct corrupted_do_info di = {length, data};
+ int srcu_idx, i, rc = -ENODEV;
+
+ map = dm_get_live_table(md, &srcu_idx);
+ if (!map)
+ return rc;
+
+ /*
+ * find the target device, and then translate the offset of this target
+ * to the whole mapped device.
+ */
+ for (i = 0; i < dm_table_get_num_targets(map); i++) {
+ ti = dm_table_get_target(map, i);
+ if (!(ti->type->iterate_devices && ti->type->rmap))
+ continue;
+ if (!ti->type->iterate_devices(ti, dm_blk_corrupted_hit, &hi))
+ continue;
+
+ rc = ti->type->rmap(ti, sect, dm_blk_corrupted_do, &di);
+ break;
+ }
+
+ dm_put_live_table(md, srcu_idx);
+ return rc;
+}
+
+static int dm_dax_notify_failure(struct dax_device *dax_dev,
+ loff_t offset, size_t length, void *data)
+{
+ struct dm_holder *holder;
+ struct list_head *holders = dax_get_holder(dax_dev);
+ int rc = -ENODEV;
+
+ list_for_each_entry(holder, holders, list) {
+ rc = dm_dax_notify_failure_one(holder->md, dax_dev, offset,
+ length, data);
+ if (rc != -ENODEV)
+ break;
+ }
+ return rc;
+}
+#else
+#define dm_dax_notify_failure NULL
+#endif
+
/*
* A target may call dm_accept_partial_bio only from the map routine. It is
* allowed for all bio types except REQ_PREFLUSH, REQ_OP_ZONE_* zone management
@@ -3057,6 +3177,10 @@ static const struct dax_operations dm_dax_ops = {
.zero_page_range = dm_dax_zero_page_range,
};
+static const struct dax_holder_operations dm_dax_holder_ops = {
+ .notify_failure = dm_dax_notify_failure,
+};
+
/*
* module hooks
*/
