Restore __ALIGN_MASK()

[safe/jmp/linux-2.6] / drivers / md / dm-exception-store.c

diff --git a/drivers/md/dm-exception-store.c b/drivers/md/dm-exception-store.c
index 4c01c75..2b7907b 100644 (file)
--- a/drivers/md/dm-exception-store.c
+++ b/drivers/md/dm-exception-store.c
@@ -138,16 +138,6 @@ int dm_exception_store_type_unregister(struct dm_exception_store_type *type)
 }
 EXPORT_SYMBOL(dm_exception_store_type_unregister);
 
-/*
- * Round a number up to the nearest 'size' boundary.  size must
- * be a power of 2.
- */
-static ulong round_up(ulong n, ulong size)
-{
-       size--;
-       return (n + size) & ~size;
-}
-
 static int set_chunk_size(struct dm_exception_store *store,
                          const char *chunk_size_arg, char **error)
 {
@@ -155,7 +145,8 @@ static int set_chunk_size(struct dm_exception_store *store,
        char *value;
 
        chunk_size_ulong = simple_strtoul(chunk_size_arg, &value, 10);
-       if (*chunk_size_arg == '\0' || *value != '\0') {
+       if (*chunk_size_arg == '\0' || *value != '\0' ||
+           chunk_size_ulong > UINT_MAX) {
                *error = "Invalid chunk size";
                return -EINVAL;
        }
@@ -165,40 +156,42 @@ static int set_chunk_size(struct dm_exception_store *store,
                return 0;
        }
 
-       /*
-        * Chunk size must be multiple of page size.  Silently
-        * round up if it's not.
-        */
-       chunk_size_ulong = round_up(chunk_size_ulong, PAGE_SIZE >> 9);
-
-       return dm_exception_store_set_chunk_size(store, chunk_size_ulong,
+       return dm_exception_store_set_chunk_size(store,
+                                                (unsigned) chunk_size_ulong,
                                                 error);
 }
 
 int dm_exception_store_set_chunk_size(struct dm_exception_store *store,
-                                     unsigned long chunk_size_ulong,
+                                     unsigned chunk_size,
                                      char **error)
 {
        /* Check chunk_size is a power of 2 */
-       if (!is_power_of_2(chunk_size_ulong)) {
+       if (!is_power_of_2(chunk_size)) {
                *error = "Chunk size is not a power of 2";
                return -EINVAL;
        }
 
        /* Validate the chunk size against the device block size */
-       if (chunk_size_ulong % (bdev_logical_block_size(store->cow->bdev) >> 9)) {
+       if (chunk_size %
+           (bdev_logical_block_size(dm_snap_cow(store->snap)->bdev) >> 9)) {
                *error = "Chunk size is not a multiple of device blocksize";
                return -EINVAL;
        }
 
-       store->chunk_size = chunk_size_ulong;
-       store->chunk_mask = chunk_size_ulong - 1;
-       store->chunk_shift = ffs(chunk_size_ulong) - 1;
+       if (chunk_size > INT_MAX >> SECTOR_SHIFT) {
+               *error = "Chunk size is too high";
+               return -EINVAL;
+       }
+
+       store->chunk_size = chunk_size;
+       store->chunk_mask = chunk_size - 1;
+       store->chunk_shift = ffs(chunk_size) - 1;
 
        return 0;
 }
 
 int dm_exception_store_create(struct dm_target *ti, int argc, char **argv,
+                             struct dm_snapshot *snap,
                              unsigned *args_used,
                              struct dm_exception_store **store)
 {
@@ -207,7 +200,7 @@ int dm_exception_store_create(struct dm_target *ti, int argc, char **argv,
        struct dm_exception_store *tmp_store;
        char persistent;
 
-       if (argc < 3) {
+       if (argc < 2) {
                ti->error = "Insufficient exception store arguments";
                return -EINVAL;
        }
@@ -218,14 +211,15 @@ int dm_exception_store_create(struct dm_target *ti, int argc, char **argv,
                return -ENOMEM;
        }
 
-       persistent = toupper(*argv[1]);
+       persistent = toupper(*argv[0]);
        if (persistent == 'P')
                type = get_type("P");
        else if (persistent == 'N')
                type = get_type("N");
        else {
                ti->error = "Persistent flag is not P or N";
-               return -EINVAL;
+               r = -EINVAL;
+               goto bad_type;
        }
 
        if (!type) {
@@ -235,32 +229,23 @@ int dm_exception_store_create(struct dm_target *ti, int argc, char **argv,
        }
 
        tmp_store->type = type;
-       tmp_store->ti = ti;
-
-       r = dm_get_device(ti, argv[0], 0, 0,
-                         FMODE_READ | FMODE_WRITE, &tmp_store->cow);
-       if (r) {
-               ti->error = "Cannot get COW device";
-               goto bad_cow;
-       }
+       tmp_store->snap = snap;
 
-       r = set_chunk_size(tmp_store, argv[2], &ti->error);
+       r = set_chunk_size(tmp_store, argv[1], &ti->error);
        if (r)
-               goto bad_cow;
+               goto bad;
 
        r = type->ctr(tmp_store, 0, NULL);
        if (r) {
                ti->error = "Exception store type constructor failed";
-               goto bad_ctr;
+               goto bad;
        }
 
-       *args_used = 3;
+       *args_used = 2;
        *store = tmp_store;
        return 0;
 
-bad_ctr:
-       dm_put_device(ti, tmp_store->cow);
-bad_cow:
+bad:
        put_type(type);
 bad_type:
        kfree(tmp_store);
@@ -271,7 +256,6 @@ EXPORT_SYMBOL(dm_exception_store_create);
 void dm_exception_store_destroy(struct dm_exception_store *store)
 {
        store->type->dtr(store);
-       dm_put_device(store->ti, store->cow);
        put_type(store->type);
        kfree(store);
 }