3.16.7-ckt11 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Theodore Ts'o <tytso@xxxxxxx>
commit bd30d702fc320085f178d22866b32fdc4736c991 upstream.
Commit b8a8684502a0f introduced an accidental flag aliasing between
EXT4_EX_NOCACHE and EXT4_GET_BLOCKS_CONVERT_UNWRITTEN.
Fortunately, this didn't introduce any untorward side effects --- we
got lucky. Nevertheless, fix this and leave a warning to hopefully
avoid this from happening in the future.
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Cc: Moritz Muehlenhoff <jmm@xxxxxxxxxx>
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
---
fs/ext4/ext4.h | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 20889da7f8a0..e00dc9772402 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -569,6 +569,7 @@ enum {
#define EXT4_GET_BLOCKS_NO_PUT_HOLE 0x0200
/* Convert written extents to unwritten */
#define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0400
+/* DO NOT ASSIGN ADDITIONAL FLAG VALUES WITHOUT ADJUSTING THE FLAGS BELOW */
/*
* The bit position of these flags must not overlap with any of the
@@ -579,8 +580,8 @@ enum {
* caching the extents when reading from the extent tree while a
* truncate or punch hole operation is in progress.
*/
-#define EXT4_EX_NOCACHE 0x0400
-#define EXT4_EX_FORCE_CACHE 0x0800
+#define EXT4_EX_NOCACHE 0x0800
+#define EXT4_EX_FORCE_CACHE 0x1000
/*
* Flags used by ext4_free_blocks
--
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