Propagate deprecation of REQ_HARDBARRIER and new REQ_FLUSH/FUA
interface to upper layers.
* WRITE_BARRIER is marked deprecated and WRITE_FLUSH, WRITE_FUA and
WRITE_FLUSH_FUA are added.
* REQ_COMMON_MASK now includes REQ_FLUSH | REQ_FUA so that they are
copied from bio to request.
* BH_Ordered and BH_Eopnotsupp are marked deprecated. BH_Flush/FUA
are _NOT_ added as they can and should be specified when calling
submit_bh() as @rw parameter as suggested by Jan Kara.
Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
---
Dropped BH_Flush/FUA as suggested.
Thanks.
include/linux/blk_types.h | 2 +-
include/linux/buffer_head.h | 4 ++--
include/linux/fs.h | 20 +++++++++++++-------
3 files changed, 16 insertions(+), 10 deletions(-)
Index: block/include/linux/fs.h
===================================================================
--- block.orig/include/linux/fs.h
+++ block/include/linux/fs.h
@@ -138,13 +138,13 @@ struct inodes_stat_t {
* SWRITE_SYNC
* SWRITE_SYNC_PLUG Like WRITE_SYNC/WRITE_SYNC_PLUG, but locks the buffer.
* See SWRITE.
- * WRITE_BARRIER Like WRITE_SYNC, but tells the block layer that all
- * previously submitted writes must be safely on storage
- * before this one is started. Also guarantees that when
- * this write is complete, it itself is also safely on
- * storage. Prevents reordering of writes on both sides
- * of this IO.
- *
+ * WRITE_BARRIER DEPRECATED. Always fails. Use FLUSH/FUA instead.
+ * WRITE_FLUSH Like WRITE_SYNC but with preceding cache flush.
+ * WRITE_FUA Like WRITE_SYNC but data is guaranteed to be on
+ * non-volatile media on completion.
+ * WRITE_FLUSH_FUA Combination of WRITE_FLUSH and FUA. The IO is preceded
+ * by a cache flush and data is guaranteed to be on
+ * non-volatile media on completion.
*/
#define RW_MASK REQ_WRITE
#define RWA_MASK REQ_RAHEAD
@@ -162,6 +162,12 @@ struct inodes_stat_t {
#define WRITE_META (WRITE | REQ_META)
#define WRITE_BARRIER (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_UNPLUG | \
REQ_HARDBARRIER)
+#define WRITE_FLUSH (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_UNPLUG | \
+ REQ_FLUSH)
+#define WRITE_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_UNPLUG | \
+ REQ_FUA)
+#define WRITE_FLUSH_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_UNPLUG | \
+ REQ_FLUSH | REQ_FUA)
#define SWRITE_SYNC_PLUG (SWRITE | REQ_SYNC | REQ_NOIDLE)
#define SWRITE_SYNC (SWRITE | REQ_SYNC | REQ_NOIDLE | REQ_UNPLUG)
Index: block/include/linux/blk_types.h
===================================================================
--- block.orig/include/linux/blk_types.h
+++ block/include/linux/blk_types.h
@@ -164,7 +164,7 @@ enum rq_flag_bits {
(REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER)
#define REQ_COMMON_MASK \
(REQ_WRITE | REQ_FAILFAST_MASK | REQ_HARDBARRIER | REQ_SYNC | \
- REQ_META| REQ_DISCARD | REQ_NOIDLE)
+ REQ_META | REQ_DISCARD | REQ_NOIDLE | REQ_FLUSH | REQ_FUA)
#define REQ_UNPLUG (1 << __REQ_UNPLUG)
#define REQ_RAHEAD (1 << __REQ_RAHEAD)
Index: block/include/linux/buffer_head.h
===================================================================
--- block.orig/include/linux/buffer_head.h
+++ block/include/linux/buffer_head.h
@@ -32,8 +32,8 @@ enum bh_state_bits {
BH_Delay, /* Buffer is not yet allocated on disk */
BH_Boundary, /* Block is followed by a discontiguity */
BH_Write_EIO, /* I/O error on write */
- BH_Ordered, /* ordered write */
- BH_Eopnotsupp, /* operation not supported (barrier) */
+ BH_Ordered, /* DEPRECATED: ordered write */
+ BH_Eopnotsupp, /* DEPRECATED: operation not supported (barrier) */
BH_Unwritten, /* Buffer is allocated on disk but not written */
BH_Quiet, /* Buffer Error Prinks to be quiet */
--
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