On 24.07.23 11:02, Konstantin Khorenko wrote:
Implement intermediate find_hole() on device-mapper layer. Do some simple
checks, add new function to target_type, so any dm devices may realize it
https://jira.vzint.dev/browse/PSBM-145746
Signed-off-by: Andrey Zhadchenko <andrey.zhadche...@virtuozzo.com>
---
drivers/md/dm.c | 39 +++++++++++++++++++++++++++++++++++
include/linux/device-mapper.h | 4 ++++
2 files changed, 43 insertions(+)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index c6e16ee81281..38f810ca8829 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -480,6 +480,43 @@ static int dm_blk_ioctl(struct block_device *bdev,
fmode_t mode,
return r;
}
+static loff_t dm_find_hole(struct block_device *bdev, loff_t offset,
int whence)
+{
+ struct mapped_device *md = bdev->bd_disk->private_data;
+ struct dm_table *table;
+ struct dm_target *ti;
+ loff_t ret = -ENOTTY;
+ int srcu_idx;
+
+ table = dm_get_live_table(md, &srcu_idx);
+ if (!table || !dm_table_get_size(table))
+ goto out;
+
+ /*
+ * For now we only support devices that have a single target.
+ * But probably it is not hard to break it to a few requests to a
different
+ * targets
+ */
+ if (table->num_targets != 1)
+ goto out;
Do we need an error message here ?
+
+ ti = dm_table_get_target(table, 0);
+
+ if (dm_suspended_md(md)) {
+ ret = -EAGAIN;
+ goto out;
+ }
+
+ if (!ti->type->find_hole)
+ return -EINVAL;
mixing goto and return - on error dm_put_live_table call will be missed
+
+ ret = ti->type->find_hole(ti, offset, whence);
+
+out:
+ dm_put_live_table(md, srcu_idx);
+ return ret;
+}
+
--
Regards,
Alexander Atanasov
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