Merge branch 'master' of git://git.infradead.org/users/linville/wireless into for...

[pandora-kernel.git] / drivers / md / dm-snap-persistent.c

diff --git a/drivers/md/dm-snap-persistent.c b/drivers/md/dm-snap-persistent.c
index 135c2f1..d1f1d70 100644 (file)
--- 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;
 };
@@ -169,10 +174,9 @@ static int alloc_area(struct pstore *ps)
        if (!ps->area)
                goto err_area;
 
-       ps->zero_area = vmalloc(len);
+       ps->zero_area = vzalloc(len);
        if (!ps->zero_area)
                goto err_zero_area;
-       memset(ps->zero_area, 0, len);
 
        ps->header_area = vmalloc(len);
        if (!ps->header_area)
@@ -396,32 +400,32 @@ 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 +441,13 @@ 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 +455,7 @@ 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 +464,13 @@ 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;
        }
@@ -563,7 +567,7 @@ static int persistent_read_metadata(struct dm_exception_store *store,
        ps->exceptions_per_area = (ps->store->chunk_size << SECTOR_SHIFT) /
                                  sizeof(struct disk_exception);
        ps->callbacks = dm_vcalloc(ps->exceptions_per_area,
-                       sizeof(*ps->callbacks));
+                                  sizeof(*ps->callbacks));
        if (!ps->callbacks)
                return -ENOMEM;
 
@@ -641,12 +645,12 @@ 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
@@ -670,7 +674,7 @@ static void persistent_commit_exception(struct dm_exception_store *store,
         * If we completely filled the current area, then wipe the next one.
         */
        if ((ps->current_committed == ps->exceptions_per_area) &&
-            zero_disk_area(ps, ps->current_area + 1))
+           zero_disk_area(ps, ps->current_area + 1))
                ps->valid = 0;
 
        /*
@@ -701,7 +705,7 @@ 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 +726,9 @@ 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 +737,9 @@ 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;
        }
 
@@ -753,7 +757,7 @@ static int persistent_commit_merge(struct dm_exception_store *store,
        for (i = 0; i < nr_merged; i++)
                clear_exception(ps, ps->current_committed - 1 - i);
 
-       r = area_io(ps, WRITE);
+       r = area_io(ps, WRITE_FLUSH_FUA);
        if (r < 0)
                return r;