[XFS] sanitize xlog_in_core_t definition
Move all fields from xlog_iclog_fields_t into xlog_in_core_t instead of having
them in a substructure and the using #defines to make it look like they were
directly in xlog_in_core_t. Also document that xlog_in_core_2_t is grossly
misnamed, and make all references to it typesafe.
(First sent on Semptember 15th)
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <david@fromorbit.com>
Signed-off-by: Niv Sardi <xaiki@sgi.com>
diff --git a/fs/xfs/xfs_log_priv.h b/fs/xfs/xfs_log_priv.h
index b39a198..654167b 100644
--- a/fs/xfs/xfs_log_priv.h
+++ b/fs/xfs/xfs_log_priv.h
@@ -310,6 +310,16 @@
} xlog_rec_ext_header_t;
#ifdef __KERNEL__
+
+/*
+ * Quite misnamed, because this union lays out the actual on-disk log buffer.
+ */
+typedef union xlog_in_core2 {
+ xlog_rec_header_t hic_header;
+ xlog_rec_ext_header_t hic_xheader;
+ char hic_sector[XLOG_HEADER_SIZE];
+} xlog_in_core_2_t;
+
/*
* - A log record header is 512 bytes. There is plenty of room to grow the
* xlog_rec_header_t into the reserved space.
@@ -339,7 +349,7 @@
* We'll put all the read-only and l_icloglock fields in the first cacheline,
* and move everything else out to subsequent cachelines.
*/
-typedef struct xlog_iclog_fields {
+typedef struct xlog_in_core {
sv_t ic_force_wait;
sv_t ic_write_wait;
struct xlog_in_core *ic_next;
@@ -362,41 +372,11 @@
/* reference counts need their own cacheline */
atomic_t ic_refcnt ____cacheline_aligned_in_smp;
-} xlog_iclog_fields_t;
-
-typedef union xlog_in_core2 {
- xlog_rec_header_t hic_header;
- xlog_rec_ext_header_t hic_xheader;
- char hic_sector[XLOG_HEADER_SIZE];
-} xlog_in_core_2_t;
-
-typedef struct xlog_in_core {
- xlog_iclog_fields_t hic_fields;
- xlog_in_core_2_t *hic_data;
+ xlog_in_core_2_t *ic_data;
+#define ic_header ic_data->hic_header
} xlog_in_core_t;
/*
- * Defines to save our code from this glop.
- */
-#define ic_force_wait hic_fields.ic_force_wait
-#define ic_write_wait hic_fields.ic_write_wait
-#define ic_next hic_fields.ic_next
-#define ic_prev hic_fields.ic_prev
-#define ic_bp hic_fields.ic_bp
-#define ic_log hic_fields.ic_log
-#define ic_callback hic_fields.ic_callback
-#define ic_callback_lock hic_fields.ic_callback_lock
-#define ic_callback_tail hic_fields.ic_callback_tail
-#define ic_trace hic_fields.ic_trace
-#define ic_size hic_fields.ic_size
-#define ic_offset hic_fields.ic_offset
-#define ic_refcnt hic_fields.ic_refcnt
-#define ic_bwritecnt hic_fields.ic_bwritecnt
-#define ic_state hic_fields.ic_state
-#define ic_datap hic_fields.ic_datap
-#define ic_header hic_data->hic_header
-
-/*
* The reservation head lsn is not made up of a cycle number and block number.
* Instead, it uses a cycle number and byte number. Logs don't expect to
* overflow 31 bits worth of byte offset, so using a byte number will mean