net: rtnetlink: validate IFLA_MTU attribute in rtnl_create_link()

[mirror_ubuntu-bionic-kernel.git] / include / linux / blk_types.h

diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index 9e7d8bd776d227d2ba92b137af7230300f5b1d4a..297978a0e48677819418b1703766dd1a1541ecb1 100644 (file)
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -20,8 +20,13 @@ typedef void (bio_end_io_t) (struct bio *);
 
 /*
  * Block error status values.  See block/blk-core:blk_errors for the details.
+ * Alpha cannot write a byte atomically, so we need to use 32-bit value.
  */
+#if defined(CONFIG_ALPHA) && !defined(__alpha_bwx__)
+typedef u32 __bitwise blk_status_t;
+#else
 typedef u8 __bitwise blk_status_t;
+#endif
 #define        BLK_STS_OK 0
 #define BLK_STS_NOTSUPP                ((__force blk_status_t)1)
 #define BLK_STS_TIMEOUT                ((__force blk_status_t)2)
@@ -39,6 +44,24 @@ typedef u8 __bitwise blk_status_t;
 
 #define BLK_STS_AGAIN          ((__force blk_status_t)12)
 
+/*
+ * BLK_STS_DEV_RESOURCE is returned from the driver to the block layer if
+ * device related resources are unavailable, but the driver can guarantee
+ * that the queue will be rerun in the future once resources become
+ * available again. This is typically the case for device specific
+ * resources that are consumed for IO. If the driver fails allocating these
+ * resources, we know that inflight (or pending) IO will free these
+ * resource upon completion.
+ *
+ * This is different from BLK_STS_RESOURCE in that it explicitly references
+ * a device specific resource. For resources of wider scope, allocation
+ * failure can happen without having pending IO. This means that we can't
+ * rely on request completions freeing these resources, as IO may not be in
+ * flight. Examples of that are kernel memory allocations, DMA mappings, or
+ * any other system wide resources.
+ */
+#define BLK_STS_DEV_RESOURCE   ((__force blk_status_t)13)
+
 struct blk_issue_stat {
        u64 stat;
 };