Introduce a new function dm_bufio_forget. It frees the given buffer.
Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
---
drivers/md/dm-bufio.c | 22 ++++++++++++++++++++++
drivers/md/dm-bufio.h | 7 +++++++
2 files changed, 29 insertions(+)
Index: linux-3.13-rc7/drivers/md/dm-bufio.c
===================================================================
--- linux-3.13-rc7.orig/drivers/md/dm-bufio.c 2014-01-14 00:52:22.000000000 +0100
+++ linux-3.13-rc7/drivers/md/dm-bufio.c 2014-01-14 00:52:25.000000000 +0100
@@ -1350,6 +1350,28 @@ retry:
}
EXPORT_SYMBOL_GPL(dm_bufio_release_move);
+/*
+ * Free the given buffer.
+ *
+ * This is just a hint, if the buffer is in use or dirty, this function
+ * does nothing.
+ */
+void dm_bufio_forget(struct dm_bufio_client *c, sector_t block)
+{
+ struct dm_buffer *b;
+
+ dm_bufio_lock(c);
+
+ b = __find(c, block);
+ if (b && likely(!b->hold_count) && likely(!b->state)) {
+ __unlink_buffer(b);
+ __free_buffer_wake(b);
+ }
+
+ dm_bufio_unlock(c);
+}
+EXPORT_SYMBOL(dm_bufio_forget);
+
unsigned dm_bufio_get_block_size(struct dm_bufio_client *c)
{
return c->block_size;
Index: linux-3.13-rc7/drivers/md/dm-bufio.h
===================================================================
--- linux-3.13-rc7.orig/drivers/md/dm-bufio.h 2014-01-14 00:52:22.000000000 +0100
+++ linux-3.13-rc7/drivers/md/dm-bufio.h 2014-01-14 00:52:25.000000000 +0100
@@ -108,6 +108,13 @@ int dm_bufio_issue_flush(struct dm_bufio
*/
void dm_bufio_release_move(struct dm_buffer *b, sector_t new_block);
+/*
+ * Free the given buffer.
+ * This is just a hint, if the buffer is in use or dirty, this function
+ * does nothing.
+ */
+void dm_bufio_forget(struct dm_bufio_client *c, sector_t block);
+
unsigned dm_bufio_get_block_size(struct dm_bufio_client *c);
sector_t dm_bufio_get_device_size(struct dm_bufio_client *c);
sector_t dm_bufio_get_block_number(struct dm_buffer *b);
--
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