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>

3 files changed, 54 insertions, 43 deletions

diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index bae6c4e23d3f..f5406766ece3 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -239,7 +239,7 @@ static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv,
                               struct dm_crypt_request *dmreq)
 {
         memset(iv, 0, cc->iv_size);
-        *(u32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff);
+        *(__le32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff);
 
         return 0;
 }
@@ -248,7 +248,7 @@ static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv,
                                 struct dm_crypt_request *dmreq)
 {
         memset(iv, 0, cc->iv_size);
-        *(u64 *)iv = cpu_to_le64(dmreq->iv_sector);
+        *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector);
 
         return 0;
 }
@@ -415,7 +415,7 @@ static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv,
         struct crypto_cipher *essiv_tfm = this_crypt_config(cc)->iv_private;
 
         memset(iv, 0, cc->iv_size);
-        *(u64 *)iv = cpu_to_le64(dmreq->iv_sector);
+        *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector);
         crypto_cipher_encrypt_one(essiv_tfm, iv, iv);
 
         return 0;
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);
diff --git a/drivers/md/dm-snap-persistent.c b/drivers/md/dm-snap-persistent.c
index e4ecadf0548a..39becbec4dfe 100644
--- a/drivers/md/dm-snap-persistent.c
+++ b/drivers/md/dm-snap-persistent.c
@@ -58,25 +58,30 @@
 #define NUM_SNAPSHOT_HDR_CHUNKS 1
 
 struct disk_header {
-        uint32_t magic;
+        __le32 magic;
 
         /*
          * Is this snapshot valid.  There is no way of recovering
          * an invalid snapshot.
          */
-        uint32_t valid;
+        __le32 valid;
 
         /*
          * Simple, incrementing version. no backward
          * compatibility.
          */
-        uint32_t version;
+        __le32 version;
 
         /* In sectors */
-        uint32_t chunk_size;
-};
+        __le32 chunk_size;
+} __packed;
 
 struct disk_exception {
+        __le64 old_chunk;
+        __le64 new_chunk;
+} __packed;
+
+struct core_exception {
         uint64_t old_chunk;
         uint64_t new_chunk;
 };
@@ -396,32 +401,32 @@ static struct disk_exception *get_exception(struct pstore *ps, uint32_t index)
 }
 
 static void read_exception(struct pstore *ps,
-                           uint32_t index, struct disk_exception *result)
+                           uint32_t index, struct core_exception *result)
 {
-        struct disk_exception *e = get_exception(ps, index);
+        struct disk_exception *de = get_exception(ps, index);
 
         /* copy it */
-        result->old_chunk = le64_to_cpu(e->old_chunk);
-        result->new_chunk = le64_to_cpu(e->new_chunk);
+        result->old_chunk = le64_to_cpu(de->old_chunk);
+        result->new_chunk = le64_to_cpu(de->new_chunk);
 }
 
 static void write_exception(struct pstore *ps,
-                            uint32_t index, struct disk_exception *de)
+                            uint32_t index, struct core_exception *e)
 {
-        struct disk_exception *e = get_exception(ps, index);
+        struct disk_exception *de = get_exception(ps, index);
 
         /* copy it */
-        e->old_chunk = cpu_to_le64(de->old_chunk);
-        e->new_chunk = cpu_to_le64(de->new_chunk);
+        de->old_chunk = cpu_to_le64(e->old_chunk);
+        de->new_chunk = cpu_to_le64(e->new_chunk);
 }
 
 static void clear_exception(struct pstore *ps, uint32_t index)
 {
-        struct disk_exception *e = get_exception(ps, index);
+        struct disk_exception *de = get_exception(ps, index);
 
         /* clear it */
-        e->old_chunk = 0;
-        e->new_chunk = 0;
+        de->old_chunk = 0;
+        de->new_chunk = 0;
 }
 
 /*
@@ -437,13 +442,13 @@ static int insert_exceptions(struct pstore *ps,
 {
         int r;
         unsigned int i;
-        struct disk_exception de;
+        struct core_exception e;
 
         /* presume the area is full */
         *full = 1;
 
         for (i = 0; i < ps->exceptions_per_area; i++) {
-                read_exception(ps, i, &de);
+                read_exception(ps, i, &e);
 
                 /*
                  * If the new_chunk is pointing at the start of
@@ -451,7 +456,7 @@ static int insert_exceptions(struct pstore *ps,
                  * is we know that we've hit the end of the
                  * exceptions.  Therefore the area is not full.
                  */
-                if (de.new_chunk == 0LL) {
+                if (e.new_chunk == 0LL) {
                         ps->current_committed = i;
                         *full = 0;
                         break;
@@ -460,13 +465,13 @@ static int insert_exceptions(struct pstore *ps,
                 /*
                  * Keep track of the start of the free chunks.
                  */
-                if (ps->next_free <= de.new_chunk)
-                        ps->next_free = de.new_chunk + 1;
+                if (ps->next_free <= e.new_chunk)
+                        ps->next_free = e.new_chunk + 1;
 
                 /*
                  * Otherwise we add the exception to the snapshot.
                  */
-                r = callback(callback_context, de.old_chunk, de.new_chunk);
+                r = callback(callback_context, e.old_chunk, e.new_chunk);
                 if (r)
                         return r;
         }
@@ -641,12 +646,12 @@ static void persistent_commit_exception(struct dm_exception_store *store,
 {
         unsigned int i;
         struct pstore *ps = get_info(store);
-        struct disk_exception de;
+        struct core_exception ce;
         struct commit_callback *cb;
 
-        de.old_chunk = e->old_chunk;
-        de.new_chunk = e->new_chunk;
-        write_exception(ps, ps->current_committed++, &de);
+        ce.old_chunk = e->old_chunk;
+        ce.new_chunk = e->new_chunk;
+        write_exception(ps, ps->current_committed++, &ce);
 
         /*
          * Add the callback to the back of the array.  This code
@@ -701,7 +706,7 @@ static int persistent_prepare_merge(struct dm_exception_store *store,
                                     chunk_t *last_new_chunk)
 {
         struct pstore *ps = get_info(store);
-        struct disk_exception de;
+        struct core_exception ce;
         int nr_consecutive;
         int r;
 
@@ -722,9 +727,9 @@ static int persistent_prepare_merge(struct dm_exception_store *store,
                 ps->current_committed = ps->exceptions_per_area;
         }
 
-        read_exception(ps, ps->current_committed - 1, &de);
-        *last_old_chunk = de.old_chunk;
-        *last_new_chunk = de.new_chunk;
+        read_exception(ps, ps->current_committed - 1, &ce);
+        *last_old_chunk = ce.old_chunk;
+        *last_new_chunk = ce.new_chunk;
 
         /*
          * Find number of consecutive chunks within the current area,
@@ -733,9 +738,9 @@ static int persistent_prepare_merge(struct dm_exception_store *store,
         for (nr_consecutive = 1; nr_consecutive < ps->current_committed;
              nr_consecutive++) {
                 read_exception(ps, ps->current_committed - 1 - nr_consecutive,
-                               &de);
-                if (de.old_chunk != *last_old_chunk - nr_consecutive ||
-                    de.new_chunk != *last_new_chunk - nr_consecutive)
+                               &ce);
+                if (ce.old_chunk != *last_old_chunk - nr_consecutive ||
+                    ce.new_chunk != *last_new_chunk - nr_consecutive)
                         break;
         }