*--------------------------------------------------------------*/
struct dm_block_manager {
struct dm_bufio_client *bufio;
+ bool read_only:1;
};
struct dm_block_manager *dm_block_manager_create(struct block_device *bdev,
goto bad;
}
+ bm->read_only = false;
+
return bm;
bad:
void *p;
int r;
+ if (bm->read_only)
+ return -EPERM;
+
p = dm_bufio_read(bm->bufio, b, (struct dm_buffer **) result);
if (unlikely(IS_ERR(p)))
return PTR_ERR(p);
struct buffer_aux *aux;
void *p;
+ if (bm->read_only)
+ return -EPERM;
+
p = dm_bufio_new(bm->bufio, b, (struct dm_buffer **) result);
if (unlikely(IS_ERR(p)))
return PTR_ERR(p);
}
EXPORT_SYMBOL_GPL(dm_bm_unlock);
-int dm_bm_unlock_move(struct dm_block *b, dm_block_t n)
-{
- struct buffer_aux *aux;
-
- aux = dm_bufio_get_aux_data(to_buffer(b));
-
- if (aux->write_locked) {
- dm_bufio_mark_buffer_dirty(to_buffer(b));
- bl_up_write(&aux->lock);
- } else
- bl_up_read(&aux->lock);
-
- dm_bufio_release_move(to_buffer(b), n);
- return 0;
-}
-
int dm_bm_flush_and_unlock(struct dm_block_manager *bm,
struct dm_block *superblock)
{
int r;
+ if (bm->read_only)
+ return -EPERM;
+
r = dm_bufio_write_dirty_buffers(bm->bufio);
if (unlikely(r)) {
dm_bm_unlock(superblock);
return dm_bufio_write_dirty_buffers(bm->bufio);
}
+void dm_bm_set_read_only(struct dm_block_manager *bm)
+{
+ bm->read_only = true;
+}
+EXPORT_SYMBOL_GPL(dm_bm_set_read_only);
+
u32 dm_bm_checksum(const void *data, size_t len, u32 init_xor)
{
return crc32c(~(u32) 0, data, len) ^ init_xor;