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* Hashtable has been replaced by rbtree to manage buffers.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: Shenghui Wang <shhuiw@foxmail.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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@ -65,7 +65,7 @@
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/*
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* Linking of buffers:
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* All buffers are linked to cache_hash with their hash_list field.
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* All buffers are linked to buffer_tree with their node field.
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*
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* Clean buffers that are not being written (B_WRITING not set)
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* are linked to lru[LIST_CLEAN] with their lru_list field.
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@ -457,7 +457,7 @@ static void free_buffer(struct dm_buffer *b)
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}
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/*
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* Link buffer to the hash list and clean or dirty queue.
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* Link buffer to the buffer tree and clean or dirty queue.
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*/
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static void __link_buffer(struct dm_buffer *b, sector_t block, int dirty)
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{
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@ -472,7 +472,7 @@ static void __link_buffer(struct dm_buffer *b, sector_t block, int dirty)
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}
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/*
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* Unlink buffer from the hash list and dirty or clean queue.
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* Unlink buffer from the buffer tree and dirty or clean queue.
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*/
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static void __unlink_buffer(struct dm_buffer *b)
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{
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@ -993,7 +993,7 @@ static struct dm_buffer *__bufio_new(struct dm_bufio_client *c, sector_t block,
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/*
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* We've had a period where the mutex was unlocked, so need to
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* recheck the hash table.
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* recheck the buffer tree.
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*/
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b = __find(c, block);
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if (b) {
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@ -1327,7 +1327,7 @@ again:
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EXPORT_SYMBOL_GPL(dm_bufio_write_dirty_buffers);
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/*
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* Use dm-io to send and empty barrier flush the device.
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* Use dm-io to send an empty barrier to flush the device.
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*/
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int dm_bufio_issue_flush(struct dm_bufio_client *c)
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{
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@ -1356,7 +1356,7 @@ EXPORT_SYMBOL_GPL(dm_bufio_issue_flush);
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* Then, we write the buffer to the original location if it was dirty.
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*
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* Then, if we are the only one who is holding the buffer, relink the buffer
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* in the hash queue for the new location.
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* in the buffer tree for the new location.
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*
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* If there was someone else holding the buffer, we write it to the new
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* location but not relink it, because that other user needs to have the buffer
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