Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit ef992373 authored by Shenghui Wang's avatar Shenghui Wang Committed by Mike Snitzer
Browse files

dm bufio: update comment in dm-bufio.c 



* Hashtable has been replaced by rbtree to manage buffers.
  Update the comment.
* Fix typo in the comment for dm_bufio_issue_flush

Signed-off-by: default avatarShenghui Wang <shhuiw@foxmail.com>
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
parent e8ea141a

drivers/md/dm-bufio.c

+6 −6
Original line number Diff line number Diff line
@@ -65,7 +65,7 @@ 


/*

 * Linking of buffers:

 *	All buffers are linked to cache_hash with their hash_list field.

 *	All buffers are linked to buffer_tree with their node field.

 *

 *	Clean buffers that are not being written (B_WRITING not set)

 *	are linked to lru[LIST_CLEAN] with their lru_list field.
@@ -457,7 +457,7 @@ static void free_buffer(struct dm_buffer *b) 
}



/*

 * Link buffer to the hash list and clean or dirty queue.

 * Link buffer to the buffer tree and clean or dirty queue.

 */

static void __link_buffer(struct dm_buffer *b, sector_t block, int dirty)

{
@@ -472,7 +472,7 @@ static void __link_buffer(struct dm_buffer *b, sector_t block, int dirty) 
}



/*

 * Unlink buffer from the hash list and dirty or clean queue.

 * Unlink buffer from the buffer tree and dirty or clean queue.

 */

static void __unlink_buffer(struct dm_buffer *b)

{
@@ -993,7 +993,7 @@ static struct dm_buffer *__bufio_new(struct dm_bufio_client *c, sector_t block, 


	/*

	 * We've had a period where the mutex was unlocked, so need to

	 * recheck the hash table.

	 * recheck the buffer tree.

	 */

	b = __find(c, block);

	if (b) {
@@ -1327,7 +1327,7 @@ int dm_bufio_write_dirty_buffers(struct dm_bufio_client *c) 
EXPORT_SYMBOL_GPL(dm_bufio_write_dirty_buffers);



/*

 * Use dm-io to send and empty barrier flush the device.

 * Use dm-io to send an empty barrier to flush the device.

 */

int dm_bufio_issue_flush(struct dm_bufio_client *c)

{
@@ -1356,7 +1356,7 @@ EXPORT_SYMBOL_GPL(dm_bufio_issue_flush); 
 * Then, we write the buffer to the original location if it was dirty.

 *

 * Then, if we are the only one who is holding the buffer, relink the buffer

 * in the hash queue for the new location.

 * in the buffer tree for the new location.

 *

 * If there was someone else holding the buffer, we write it to the new

 * location but not relink it, because that other user needs to have the buffer