[PATCH 1/3] dm-pcache: replace tabs with spaces in comments to fix ASCII diagram alignment

[jianyungao89]

From: Jianyun Gao <jianyungao89@xxxxxxxxx>

Some editors interpret tabs as 4 spaces while others use 2, causing
ASCII art diagrams in comments to misalign and hurt readability.
Replace tabs with spaces to ensure consistent display across all editors.

Signed-off-by: Jianyun Gao <jianyungao89@xxxxxxxxx>
---
 drivers/md/dm-pcache/cache.h     |  4 ++--
 drivers/md/dm-pcache/cache_key.c |  2 +-
 drivers/md/dm-pcache/cache_req.c | 12 ++++++------
 3 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/md/dm-pcache/cache.h b/drivers/md/dm-pcache/cache.h
index 27613b56be54..b1f44f62e336 100644
--- a/drivers/md/dm-pcache/cache.h
+++ b/drivers/md/dm-pcache/cache.h
@@ -273,7 +273,7 @@ struct pcache_cache_subtree_walk_ctx {
 	struct list_head *submit_req_list;
 
 	/*
-	 *	  |--------|		key_tmp
+	 *        |--------|		key_tmp
 	 * |====|			key
 	 */
 	int (*before)(struct pcache_cache_key *key, struct pcache_cache_key *key_tmp,
@@ -281,7 +281,7 @@ struct pcache_cache_subtree_walk_ctx {
 
 	/*
 	 * |----------|			key_tmp
-	 *		|=====|		key
+	 *              |=====|		key
 	 */
 	int (*after)(struct pcache_cache_key *key, struct pcache_cache_key *key_tmp,
 			struct pcache_cache_subtree_walk_ctx *ctx);
diff --git a/drivers/md/dm-pcache/cache_key.c b/drivers/md/dm-pcache/cache_key.c
index e068e878231b..c83fcb303e88 100644
--- a/drivers/md/dm-pcache/cache_key.c
+++ b/drivers/md/dm-pcache/cache_key.c
@@ -265,7 +265,7 @@ int cache_subtree_walk(struct pcache_cache_subtree_walk_ctx *ctx)
 
 		/*
 		 * If key_tmp starts after the end of key, stop traversing.
-		 *	  |--------|
+		 *        |--------|
 		 * |====|
 		 */
 		if (cache_key_lstart(key_tmp) >= cache_key_lend(key)) {
diff --git a/drivers/md/dm-pcache/cache_req.c b/drivers/md/dm-pcache/cache_req.c
index 7854a30e07b7..cc5747d472e9 100644
--- a/drivers/md/dm-pcache/cache_req.c
+++ b/drivers/md/dm-pcache/cache_req.c
@@ -317,7 +317,7 @@ static struct pcache_backing_dev_req *get_pre_alloc_req(struct pcache_cache_subt
  *
  * The scenario handled here:
  *
- *	  |--------|			  key_tmp (existing cached range)
+ *        |--------|			  key_tmp (existing cached range)
  * |====|					   key (requested range, preceding key_tmp)
  *
  * Since `key` is before `key_tmp`, it signifies that the requested data
@@ -352,7 +352,7 @@ static int read_before(struct pcache_cache_key *key, struct pcache_cache_key *ke
  * During cache_subtree_walk, this function manages a scenario where part of the
  * requested data range overlaps with an existing cache node (`key_tmp`).
  *
- *	 |----------------|  key_tmp (existing cached range)
+ *     |----------------|  key_tmp (existing cached range)
  * |===========|		   key (requested range, overlapping the tail of key_tmp)
  */
 static int read_overlap_tail(struct pcache_cache_key *key, struct pcache_cache_key *key_tmp,
@@ -474,8 +474,8 @@ static int read_overlap_contain(struct pcache_cache_key *key, struct pcache_cach
 }
 
 /*
- *	 |-----------|		key_tmp (existing cached range)
- *	   |====|			key (requested range, fully within key_tmp)
+ * |-----------|		key_tmp (existing cached range)
+ *   |====|			key (requested range, fully within key_tmp)
  *
  * If `key_tmp` contains valid cached data, this function copies the relevant
  * portion to the request's bio. Otherwise, it sends a backing request to
@@ -524,8 +524,8 @@ static int read_overlap_contained(struct pcache_cache_key *key, struct pcache_ca
 }
 
 /*
- *	 |--------|		  key_tmp (existing cached range)
- *	   |==========|	  key (requested range, overlapping the head of key_tmp)
+ * |--------|		  key_tmp (existing cached range)
+ *   |==========|	  key (requested range, overlapping the head of key_tmp)
  */
 static int read_overlap_head(struct pcache_cache_key *key, struct pcache_cache_key *key_tmp,
 		struct pcache_cache_subtree_walk_ctx *ctx)
-- 
2.34.1