Patch "dm cache metadata: fix READ_LOCK macros and cleanup WRITE_LOCK macros" has been added to the 4.4-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    dm cache metadata: fix READ_LOCK macros and cleanup WRITE_LOCK macros

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     dm-cache-metadata-fix-read_lock-macros-and-cleanup-write_lock-macros.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 9567366fefddeaea4ed1d713270535d93a3b3c76 Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@redhat.com>
Date: Tue, 12 Apr 2016 12:14:46 -0400
Subject: dm cache metadata: fix READ_LOCK macros and cleanup WRITE_LOCK macros

From: Mike Snitzer <snitzer@redhat.com>

commit 9567366fefddeaea4ed1d713270535d93a3b3c76 upstream.

The READ_LOCK macro was incorrectly returning -EINVAL if
dm_bm_is_read_only() was true -- it will always be true once the cache
metadata transitions to read-only by dm_cache_metadata_set_read_only().

Wrap READ_LOCK and WRITE_LOCK multi-statement macros in do {} while(0).
Also, all accesses of the 'cmd' argument passed to these related macros
are now encapsulated in parenthesis.

A follow-up patch can be developed to eliminate the use of macros in
favor of pure C code.  Avoiding that now given that this needs to apply
to stable@.

Reported-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Fixes: d14fcf3dd79 ("dm cache: make sure every metadata function checks fail_io")
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/md/dm-cache-metadata.c |   64 +++++++++++++++++++++++++----------------
 1 file changed, 40 insertions(+), 24 deletions(-)

--- a/drivers/md/dm-cache-metadata.c
+++ b/drivers/md/dm-cache-metadata.c
@@ -867,39 +867,55 @@ static int blocks_are_unmapped_or_clean(
 	return 0;
 }
 
-#define WRITE_LOCK(cmd)	\
-	down_write(&cmd->root_lock); \
-	if (cmd->fail_io || dm_bm_is_read_only(cmd->bm)) { \
-		up_write(&cmd->root_lock); \
-		return -EINVAL; \
+static bool cmd_write_lock(struct dm_cache_metadata *cmd)
+{
+	down_write(&cmd->root_lock);
+	if (cmd->fail_io || dm_bm_is_read_only(cmd->bm)) {
+		up_write(&cmd->root_lock);
+		return false;
 	}
+	return true;
+}
 
-#define WRITE_LOCK_VOID(cmd) \
-	down_write(&cmd->root_lock); \
-	if (cmd->fail_io || dm_bm_is_read_only(cmd->bm)) { \
-		up_write(&cmd->root_lock); \
-		return; \
-	}
+#define WRITE_LOCK(cmd)				\
+	do {					\
+		if (!cmd_write_lock((cmd)))	\
+			return -EINVAL;		\
+	} while(0)
+
+#define WRITE_LOCK_VOID(cmd)			\
+	do {					\
+		if (!cmd_write_lock((cmd)))	\
+			return;			\
+	} while(0)
 
 #define WRITE_UNLOCK(cmd) \
-	up_write(&cmd->root_lock)
+	up_write(&(cmd)->root_lock)
 
-#define READ_LOCK(cmd) \
-	down_read(&cmd->root_lock); \
-	if (cmd->fail_io || dm_bm_is_read_only(cmd->bm)) { \
-		up_read(&cmd->root_lock); \
-		return -EINVAL; \
+static bool cmd_read_lock(struct dm_cache_metadata *cmd)
+{
+	down_write(&cmd->root_lock);
+	if (cmd->fail_io) {
+		up_write(&cmd->root_lock);
+		return false;
 	}
+	return true;
+}
 
-#define READ_LOCK_VOID(cmd)	\
-	down_read(&cmd->root_lock); \
-	if (cmd->fail_io || dm_bm_is_read_only(cmd->bm)) { \
-		up_read(&cmd->root_lock); \
-		return; \
-	}
+#define READ_LOCK(cmd)				\
+	do {					\
+		if (!cmd_read_lock((cmd)))	\
+			return -EINVAL;		\
+	} while(0)
+
+#define READ_LOCK_VOID(cmd)			\
+	do {					\
+		if (!cmd_read_lock((cmd)))	\
+			return;			\
+	} while(0)
 
 #define READ_UNLOCK(cmd) \
-	up_read(&cmd->root_lock)
+	up_read(&(cmd)->root_lock)
 
 int dm_cache_resize(struct dm_cache_metadata *cmd, dm_cblock_t new_cache_size)
 {


Patches currently in stable-queue which might be from snitzer@redhat.com are

queue-4.4/dm-cache-metadata-fix-cmd_read_lock-acquiring-write-lock.patch
queue-4.4/dm-cache-metadata-fix-read_lock-macros-and-cleanup-write_lock-macros.patch