[PATCH V3] xfs_io: add buf_lru_ref tag to inject table

[Eric Sandeen <sandeen@sandeen.net>]

And catch it at build time if we get out of sync again.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
---

V2: add BUILD_BUG_ON
V3: dynamically size the array

(I tested w/ dynamically sized but lost it in the V2 patch)

diff --git a/include/xfs.h b/include/xfs.h
index 9f0f11b..a40ca0c 100644
--- a/include/xfs.h
+++ b/include/xfs.h
@@ -64,6 +64,10 @@ extern int xfs_assert_largefile[sizeof(off_t)-8];
 #define __packed __attribute__((packed))
 #endif
 
+#ifndef BUILD_BUG_ON
+#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
+#endif
+
 #include <xfs/xfs_types.h>
 #include <xfs/xfs_fs.h>
 
diff --git a/io/inject.c b/io/inject.c
index 9d0cf62..fc3cf25 100644
--- a/io/inject.c
+++ b/io/inject.c
@@ -30,7 +30,7 @@ error_tag(char *name)
 	static struct {
 		int	tag;
 		char	*name;
-	} *e, eflags[XFS_ERRTAG_MAX + 1] = {
+	} *e, eflags[] = {
 		{ XFS_ERRTAG_NOERROR,			"noerror" },
 		{ XFS_ERRTAG_IFLUSH_1,			"iflush1" },
 		{ XFS_ERRTAG_IFLUSH_2,			"iflush2" },
@@ -62,10 +62,14 @@ error_tag(char *name)
 		{ XFS_ERRTAG_DROP_WRITES,		"drop_writes" },
 		{ XFS_ERRTAG_LOG_BAD_CRC,		"log_bad_crc" },
 		{ XFS_ERRTAG_LOG_ITEM_PIN,		"log_item_pin" },
+		{ XFS_ERRTAG_BUF_LRU_REF,		"buf_lru_ref" },
 		{ XFS_ERRTAG_MAX,			NULL }
 	};
 	int	count;
 
+	/* If this fails make sure every tag is defined in the array above */
+	BUILD_BUG_ON(sizeof(eflags) != (XFS_ERRTAG_MAX + 1) * sizeof(*e));
+
 	/* Search for a name */
 	if (name) {
 		for (e = eflags; e->name; e++)