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dm: prepare to support WRITE SAME

Allow targets to opt in to WRITE SAME support by setting 'num_write_same_requests' in the dm_target structure. A dm device will only advertise WRITE SAME support if all its targets and all its underlying devices support it.

Mike Snitzer committed 13 years ago

Commit d54eaa51 parent 9c5091f2 files · +34 −1Browse files

Showing the changes to include (1 of 2 files). Show all

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include/linux/device-mapper.h+5−0
@@ -205,6 +205,11 @@ struct dm_target { · 204 unmodified lines
205205 */
206206 unsigned num_discard_requests;
207207
208+ /*
209+ * The number of WRITE SAME requests that will be submitted to the target.
210+ */
211+ unsigned num_write_same_requests;
212+
208213 /* target specific data */
209214 void *private;
210215

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