Commit e79ed99a authored by Andrew Morton's avatar Andrew Morton Committed by Linus Torvalds

[PATCH] dm: fix a comment

From: Kevin Corry <kevcorry@us.ibm.com>

Clarify the comment regarding the "next" field in struct dm_target_spec.  The
"next" field has different behavior if you're performing a DM_TABLE_STATUS
command than it does if you're performing a DM_TABLE_LOAD command.

See populate_table() and retrieve_status() in drivers/md/dm-ioctl.c for more
details on how this field is used.
parent e1489536
...@@ -129,8 +129,14 @@ struct dm_target_spec { ...@@ -129,8 +129,14 @@ struct dm_target_spec {
int32_t status; /* used when reading from kernel only */ int32_t status; /* used when reading from kernel only */
/* /*
* Offset in bytes (from the start of this struct) to * Location of the next dm_target_spec.
* next target_spec. * - When specifying targets on a DM_TABLE_LOAD command, this value is
* the number of bytes from the start of the "current" dm_target_spec
* to the start of the "next" dm_target_spec.
* - When retrieving targets on a DM_TABLE_STATUS command, this value
* is the number of bytes from the start of the first dm_target_spec
* (that follows the dm_ioctl struct) to the start of the "next"
* dm_target_spec.
*/ */
uint32_t next; uint32_t next;
......
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