Merge tag 'libnvdimm-for-4.17' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdim...

[linux-2.6-microblaze.git] / drivers / md / dm-log-writes.c

diff --git a/drivers/md/dm-log-writes.c b/drivers/md/dm-log-writes.c
index 9de072b..c90c7c0 100644 (file)
--- a/drivers/md/dm-log-writes.c
+++ b/drivers/md/dm-log-writes.c
@@ -611,51 +611,6 @@ static int log_mark(struct log_writes_c *lc, char *data)
        return 0;
 }
 
-static int log_dax(struct log_writes_c *lc, sector_t sector, size_t bytes,
-                  struct iov_iter *i)
-{
-       struct pending_block *block;
-
-       if (!bytes)
-               return 0;
-
-       block = kzalloc(sizeof(struct pending_block), GFP_KERNEL);
-       if (!block) {
-               DMERR("Error allocating dax pending block");
-               return -ENOMEM;
-       }
-
-       block->data = kzalloc(bytes, GFP_KERNEL);
-       if (!block->data) {
-               DMERR("Error allocating dax data space");
-               kfree(block);
-               return -ENOMEM;
-       }
-
-       /* write data provided via the iterator */
-       if (!copy_from_iter(block->data, bytes, i)) {
-               DMERR("Error copying dax data");
-               kfree(block->data);
-               kfree(block);
-               return -EIO;
-       }
-
-       /* rewind the iterator so that the block driver can use it */
-       iov_iter_revert(i, bytes);
-
-       block->datalen = bytes;
-       block->sector = bio_to_dev_sectors(lc, sector);
-       block->nr_sectors = ALIGN(bytes, lc->sectorsize) >> lc->sectorshift;
-
-       atomic_inc(&lc->pending_blocks);
-       spin_lock_irq(&lc->blocks_lock);
-       list_add_tail(&block->list, &lc->unflushed_blocks);
-       spin_unlock_irq(&lc->blocks_lock);
-       wake_up_process(lc->log_kthread);
-
-       return 0;
-}
-
 static void log_writes_dtr(struct dm_target *ti)
 {
        struct log_writes_c *lc = ti->private;
@@ -925,6 +880,52 @@ static void log_writes_io_hints(struct dm_target *ti, struct queue_limits *limit
        limits->io_min = limits->physical_block_size;
 }
 
+#if IS_ENABLED(CONFIG_DAX_DRIVER)
+static int log_dax(struct log_writes_c *lc, sector_t sector, size_t bytes,
+                  struct iov_iter *i)
+{
+       struct pending_block *block;
+
+       if (!bytes)
+               return 0;
+
+       block = kzalloc(sizeof(struct pending_block), GFP_KERNEL);
+       if (!block) {
+               DMERR("Error allocating dax pending block");
+               return -ENOMEM;
+       }
+
+       block->data = kzalloc(bytes, GFP_KERNEL);
+       if (!block->data) {
+               DMERR("Error allocating dax data space");
+               kfree(block);
+               return -ENOMEM;
+       }
+
+       /* write data provided via the iterator */
+       if (!copy_from_iter(block->data, bytes, i)) {
+               DMERR("Error copying dax data");
+               kfree(block->data);
+               kfree(block);
+               return -EIO;
+       }
+
+       /* rewind the iterator so that the block driver can use it */
+       iov_iter_revert(i, bytes);
+
+       block->datalen = bytes;
+       block->sector = bio_to_dev_sectors(lc, sector);
+       block->nr_sectors = ALIGN(bytes, lc->sectorsize) >> lc->sectorshift;
+
+       atomic_inc(&lc->pending_blocks);
+       spin_lock_irq(&lc->blocks_lock);
+       list_add_tail(&block->list, &lc->unflushed_blocks);
+       spin_unlock_irq(&lc->blocks_lock);
+       wake_up_process(lc->log_kthread);
+
+       return 0;
+}
+
 static long log_writes_dax_direct_access(struct dm_target *ti, pgoff_t pgoff,
                                         long nr_pages, void **kaddr, pfn_t *pfn)
 {
@@ -961,6 +962,10 @@ static size_t log_writes_dax_copy_from_iter(struct dm_target *ti,
 dax_copy:
        return dax_copy_from_iter(lc->dev->dax_dev, pgoff, addr, bytes, i);
 }
+#else
+#define log_writes_dax_direct_access NULL
+#define log_writes_dax_copy_from_iter NULL
+#endif
 
 static struct target_type log_writes_target = {
        .name   = "log-writes",