dm: suppress endian warnings

Suppress sparse warnings about cpu_to_le32() by using __le32 types for
on-disk data etc.

Signed-off-by: Alasdair G Kergon <agk@redhat.com>

1 files changed, 13 insertions, 7 deletions

diff --git a/drivers/md/dm-log.c b/drivers/md/dm-log.c
index 948e3f4925bf..5f06fb687408 100644
--- a/drivers/md/dm-log.c
+++ b/drivers/md/dm-log.c
@@ -197,15 +197,21 @@ EXPORT_SYMBOL(dm_dirty_log_destroy);
 #define MIRROR_DISK_VERSION 2
 #define LOG_OFFSET 2
 
-struct log_header {
-        uint32_t magic;
+struct log_header_disk {
+        __le32 magic;
 
         /*
          * Simple, incrementing version. no backward
          * compatibility.
          */
+        __le32 version;
+        __le64 nr_regions;
+} __packed;
+
+struct log_header_core {
+        uint32_t magic;
         uint32_t version;
-        sector_t nr_regions;
+        uint64_t nr_regions;
 };
 
 struct log_c {
@@ -239,10 +245,10 @@ struct log_c {
         int log_dev_failed;
         int log_dev_flush_failed;
         struct dm_dev *log_dev;
-        struct log_header header;
+        struct log_header_core header;
 
         struct dm_io_region header_location;
-        struct log_header *disk_header;
+        struct log_header_disk *disk_header;
 };
 
 /*
@@ -271,14 +277,14 @@ static inline void log_clear_bit(struct log_c *l,
 /*----------------------------------------------------------------
  * Header IO
  *--------------------------------------------------------------*/
-static void header_to_disk(struct log_header *core, struct log_header *disk)
+static void header_to_disk(struct log_header_core *core, struct log_header_disk *disk)
 {
         disk->magic = cpu_to_le32(core->magic);
         disk->version = cpu_to_le32(core->version);
         disk->nr_regions = cpu_to_le64(core->nr_regions);
 }
 
-static void header_from_disk(struct log_header *core, struct log_header *disk)
+static void header_from_disk(struct log_header_core *core, struct log_header_disk *disk)
 {
         core->magic = le32_to_cpu(disk->magic);
         core->version = le32_to_cpu(disk->version);